Repository: fffaraz/fakessh
Branch: master
Commit: 22238462b9e4
Files: 12
Total size: 8.8 KB

Directory structure:
gitextract_15v6q3lv/

├── .dockerignore
├── .github/
│   ├── FUNDING.yml
│   └── workflows/
│       ├── docker-image.yml
│       └── go.yml
├── .gitignore
├── Dockerfile
├── LICENSE
├── README.md
├── docker-compose.yml
├── fakessh.go
├── go.mod
└── go.sum

================================================
FILE CONTENTS
================================================

================================================
FILE: .dockerignore
================================================
.git/
.github/
volumes/
.gitignore
docker-compose.yml
LICENSE
README.md


================================================
FILE: .github/FUNDING.yml
================================================
# These are supported funding model platforms

github: fffaraz # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
patreon: # Replace with a single Patreon username
open_collective: # Replace with a single Open Collective username
ko_fi: # Replace with a single Ko-fi username
tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
liberapay: # Replace with a single Liberapay username
issuehunt: # Replace with a single IssueHunt username
otechie: # Replace with a single Otechie username
lfx_crowdfunding: # Replace with a single LFX Crowdfunding project-name e.g., cloud-foundry
custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']


================================================
FILE: .github/workflows/docker-image.yml
================================================
name: Docker Image CI

on:
  push:
    branches: [ "master" ]
  pull_request:
    branches: [ "master" ]

jobs:

  build:

    runs-on: ubuntu-latest

    permissions:
      contents: read
      packages: write

    steps:
    - uses: actions/checkout@v4

    - name: Set up QEMU
      uses: docker/setup-qemu-action@v3

    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v3

    - name: Log in to GitHub Container Registry
      if: github.event_name == 'push'
      uses: docker/login-action@v3
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Extract Docker metadata
      id: meta
      uses: docker/metadata-action@v5
      with:
        images: ghcr.io/${{ github.repository }}
        tags: |
          type=raw,value=latest,enable={{is_default_branch}}
          type=sha

    - name: Build and push Docker image
      uses: docker/build-push-action@v6
      with:
        context: .
        platforms: linux/amd64,linux/arm64,linux/arm/v7
        push: ${{ github.event_name == 'push' }}
        tags: ${{ steps.meta.outputs.tags }}
        labels: ${{ steps.meta.outputs.labels }}


================================================
FILE: .github/workflows/go.yml
================================================
# This workflow will build a golang project
# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-go

name: Go

on:
  push:
    branches: [ "master" ]
  pull_request:
    branches: [ "master" ]

jobs:

  build:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3

    - name: Set up Go
      uses: actions/setup-go@v4
      with:
        go-version: '1.25'

    - name: Build
      run: go build -v ./...

    - name: Test
      run: go test -v ./...


================================================
FILE: .gitignore
================================================
volumes/
fakessh
*.exe


================================================
FILE: Dockerfile
================================================
FROM golang:alpine AS builder
WORKDIR /app
COPY . .
RUN CGO_ENABLED=0 go build -ldflags="-w -s" .

FROM scratch
COPY --from=builder /app/fakessh /fakessh
EXPOSE 22
ENTRYPOINT ["/fakessh"]


================================================
FILE: LICENSE
================================================
BSD 3-Clause License

Copyright (c) 2022, Faraz Fallahi <fffaraz@gmail.com>

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


================================================
FILE: README.md
================================================
# FakeSSH

A dockerized SSH honeypot server written in Go that logs login attempts.
Password authentication always fails, so no terminal access is granted to the attacker.

## Quick Start

```
go install github.com/fffaraz/fakessh@latest
sudo setcap 'cap_net_bind_service=+ep' ~/go/bin/fakessh
fakessh [optional-log-directory]
```

OR

```
docker run -it --rm -p 22:22 ghcr.io/fffaraz/fakessh
```

OR

```
docker run -d --restart=always -p 22:22 --name fakessh ghcr.io/fffaraz/fakessh
docker logs -f fakessh
```

### See also

* [jaksi/sshesame](https://github.com/jaksi/sshesame) - A fake SSH server that lets everyone in and logs their activity
* [shazow/ssh-chat](https://github.com/shazow/ssh-chat) - Custom SSH server written in Go; instead of a shell, you get a chat prompt
* [gliderlabs/ssh](https://github.com/gliderlabs/ssh) - Easy SSH servers in Golang
* [gliderlabs/sshfront](https://github.com/gliderlabs/sshfront) - Programmable SSH frontend
* [desaster/kippo](https://github.com/desaster/kippo) - SSH honeypot
* [micheloosterhof/cowrie](https://github.com/micheloosterhof/cowrie) - SSH/Telnet honeypot
* [fzerorubigd/go0r](https://github.com/fzerorubigd/go0r) - A simple SSH honeypot in Go
* [droberson/ssh-honeypot](https://github.com/droberson/ssh-honeypot) - Fake sshd that logs IP addresses, usernames, and passwords
* [x0rz/ssh-honeypot](https://github.com/x0rz/ssh-honeypot) - Fake sshd that logs IP addresses, usernames, and passwords
* [tnich/honssh](https://github.com/tnich/honssh) - Logs all SSH communications between a client and server
* [Learn from your attackers - SSH HoneyPot](https://www.robertputt.co.uk/learn-from-your-attackers-ssh-honeypot.html)
* [cowrie](https://github.com/cowrie/cowrie) - SSH/Telnet honeypot


================================================
FILE: docker-compose.yml
================================================
version: '3'

services:
  fakessh:
    build: .
    image: fffaraz/fakessh:latest
    restart: always
    network_mode: host
    container_name: fakessh
    command: /log
    volumes:
      - ./volumes/fakessh:/log


================================================
FILE: fakessh.go
================================================
package main

import (
	"crypto/rand"
	"crypto/rsa"
	"errors"
	"fmt"
	"log"
	"net"
	"os"
	"time"

	"golang.org/x/crypto/ssh"
)

var errBadPassword = errors.New("permission denied")

func main() {
	if len(os.Args) > 1 {
		logPath := fmt.Sprintf("%s/fakessh-%s.log", os.Args[1], time.Now().Format("2006-01-02-15-04-05-000"))
		logFile, err := os.OpenFile(logPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o644)
		if err != nil {
			log.Println("Failed to open log file:", logPath, err)
			return
		}
		defer logFile.Close()
		log.SetOutput(logFile)
	}

	log.SetFlags(log.LstdFlags | log.Lmicroseconds)

	serverConfig := &ssh.ServerConfig{
		MaxAuthTries:     6,
		PasswordCallback: passwordCallback,
		ServerVersion:    randomServerVersion(),
	}

	privateKey, _ := rsa.GenerateKey(rand.Reader, 2048)
	signer, _ := ssh.NewSignerFromSigner(privateKey)
	serverConfig.AddHostKey(signer)

	listener, err := net.Listen("tcp", ":22")
	if err != nil {
		log.Println("Failed to listen:", err)
		return
	}
	defer listener.Close()

	for {
		conn, err := listener.Accept()
		if err != nil {
			log.Println("Failed to accept:", err)
			break
		}
		go handleConn(conn, serverConfig)
	}
}

func randomServerVersion() string {
	serverVersions := []string{
		"SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.3",
		"SSH-2.0-OpenSSH_6.7p1 Debian-5+deb8u3",
		"SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.10",
		"SSH-2.0-OpenSSH_7.4",
		"SSH-2.0-OpenSSH_8.0",
		"SSH-2.0-OpenSSH_8.4p1 Debian-2~bpo10+1",
		"SSH-2.0-OpenSSH_8.4p1 Debian-5+deb11u1",
		"SSH-2.0-OpenSSH_8.9p1 Ubuntu-3ubuntu0.6",
	}
	return serverVersions[time.Now().UnixNano()%int64(len(serverVersions))]
}

func passwordCallback(conn ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
	log.Println(conn.RemoteAddr(), string(conn.ClientVersion()), conn.User(), string(password))
	time.Sleep(100 * time.Millisecond)
	return nil, errBadPassword
}

func handleConn(conn net.Conn, serverConfig *ssh.ServerConfig) {
	defer conn.Close()
	conn.SetDeadline(time.Now().Add(30 * time.Second))
	log.Println(conn.RemoteAddr())
	ssh.NewServerConn(conn, serverConfig)
}


================================================
FILE: go.mod
================================================
module github.com/fffaraz/fakessh

go 1.25.0

require golang.org/x/crypto v0.49.0

require golang.org/x/sys v0.42.0 // indirect


================================================
FILE: go.sum
================================================
golang.org/x/crypto v0.49.0 h1:+Ng2ULVvLHnJ/ZFEq4KdcDd/cfjrrjjNSXNzxg0Y4U4=
golang.org/x/crypto v0.49.0/go.mod h1:ErX4dUh2UM+CFYiXZRTcMpEcN8b/1gxEuv3nODoYtCA=
golang.org/x/sys v0.42.0 h1:omrd2nAlyT5ESRdCLYdm3+fMfNFE/+Rf4bDIQImRJeo=
golang.org/x/sys v0.42.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
golang.org/x/term v0.41.0 h1:QCgPso/Q3RTJx2Th4bDLqML4W6iJiaXFq2/ftQF13YU=
golang.org/x/term v0.41.0/go.mod h1:3pfBgksrReYfZ5lvYM0kSO0LIkAl4Yl2bXOkKP7Ec2A=