Repository: quarkslab/peetch
Branch: master
Commit: 2ec684d10368
Files: 15
Total size: 70.2 KB
Directory structure:
gitextract_b_gn6amn/
├── Dockerfile
├── LICENSE.txt
├── README.md
├── doc/
│ └── notes.md
├── peetch/
│ ├── __init__.py
│ ├── __main__.py
│ ├── c_utils/
│ │ └── libssl.c
│ ├── ebpf_programs/
│ │ ├── peetch_kprobes.c
│ │ ├── peetch_proxy.c
│ │ └── peetch_uprobes.c
│ ├── globals.py
│ ├── proxy.py
│ └── utils.py
├── requirements.txt
└── setup.py
================================================
FILE CONTENTS
================================================
================================================
FILE: Dockerfile
================================================
# SPDX-License-Identifier: GPL-2.0+
# Guillaume Valadon <gvaladon@quarkslab.com>
FROM ubuntu:22.04
ENV TZ=Europe/Paris DEBIAN_FRONTEND=noninteractive
RUN echo 'PS1="quarkslab/peetch:\w# "' >> /root/.bashrc
# Install dependencies
RUN set -x && \
PACKAGES="bison build-essential cmake flex git \
libedit-dev libllvm11 llvm-11-dev libclang-11-dev python3 zlib1g-dev \
libelf-dev libfl-dev python3-distutils python3-pip linux-headers-$(uname -r) \
libssl-dev iproute2 tmux curl bc libelf-dev zip tshark curl" && \
apt-get update && apt-get install -y $PACKAGES && \
apt-get autoclean && apt-get --purge -y autoremove && \
rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
# Compile bcc
RUN git clone https://github.com/iovisor/bcc && cd bcc/ && mkdir build && \
cd build && cmake .. && make install && cd src && make install && rm -rf /bcc/
# Install peetch
COPY . /peetch
RUN cd /peetch && pip install --upgrade pip && pip install -r requirements.txt && \
pip install . && rm -rf /peetch
================================================
FILE: LICENSE.txt
================================================
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================================================
FILE: README.md
================================================
# peetch
`peetch` is a collection of tools aimed at experimenting with different aspects of eBPF to bypass TLS protocol protections.
Currently, peetch includes three subcommands. The first called `dump` aims to sniff network traffic by associating information about the source process with each packet. The second called `tls` allows identifying processes using OpenSSL to extract cryptographic keys. The third one `proxy` automatically intercepts TLS traffic from processes using OpenSSL and decrypts messages on the fly.
Combined, the first two commands make it possible to decrypt TLS exchanges recorded in the PCAPng format.
## Installation
`peetch` relies on several dependencies including [bcc](https://github.com/iovisor/bcc) and [Scapy](https://github.com/secdev/scapy). A Docker image can be easily built in order to easily test `peetch` using the following command:
```shell
docker build -t quarkslab/peetch .
```
## Commands Walk Through
The following examples assume that you used the following command to enter the Docker image and launch examples within it:
```shell
docker run --privileged --network host --mount type=bind,source=/sys,target=/sys --mount type=bind,source=/proc,target=/proc --pid host --rm -it quarkslab/peetch
```
### `dump`
This sub-command gives you the ability to sniff packets using an eBPF TC classifier and to retrieve the corresponding PID and process names with:
```shell
peetch dump
curl/1289291 - Ether / IP / TCP 10.211.55.10:53052 > 208.97.177.124:https S / Padding
curl/1289291 - Ether / IP / TCP 208.97.177.124:https > 10.211.55.10:53052 SA / Padding
curl/1289291 - Ether / IP / TCP 10.211.55.10:53052 > 208.97.177.124:https A / Padding
curl/1289291 - Ether / IP / TCP 10.211.55.10:53052 > 208.97.177.124:https PA / Raw / Padding
curl/1289291 - Ether / IP / TCP 208.97.177.124:https > 10.211.55.10:53052 A / Padding
```
Note that as of today, `dump` will only capture IPv4 based TCP segments.
For convenience, the captured packets can be store to PCAPng along with process information using `--write`:
```shell
peetch dump --write peetch.pcapng
^C
```
This PCAPng can easily be manipulated with Wireshark or Scapy:
```python
scapy
>>> l = rdpcap("peetch.pcapng")
>>> l[0]
<Ether dst=00:1c:42:00:00:18 src=00:1c:42:54:f3:34 type=IPv4 |<IP version=4 ihl=5 tos=0x0 len=60 id=11088 flags=DF frag=0 ttl=64 proto=tcp chksum=0x4bb1 src=10.211.55.10 dst=208.97.177.124 |<TCP sport=53054 dport=https seq=631406526 ack=0 dataofs=10 reserved=0 flags=S window=64240 chksum=0xc3e9 urgptr=0 options=[('MSS', 1460), ('SAckOK', b''), ('Timestamp', (1272423534, 0)), ('NOP', None), ('WScale', 7)] |<Padding load='\x00\x00' |>>>>
>>> l[0].comment
b'curl/1289909'
```
### `tls`
This sub-command aims to identify processes that uses OpenSSL and makes it easy to dump several things like plaintext and secrets.
By default, `peetch tls` will only display one line per process, the `--directions` argument makes it possible to display the exchanged messages:
```shell
peetch tls --directions
<- curl (1291078) 208.97.177.124/443 TLS1.2 ECDHE-RSA-AES128-GCM-SHA256
-> curl (1291078) 208.97.177.124/443 TLS1.2 ECDHE-RSA-AES128-GCM-SHA256
```
Displaying OpenSSL buffer content is achieved with `--content`.
```shell
peetch tls --content
<- curl (1290608) 208.97.177.124/443 TLS1.2 ECDHE-RSA-AES128-GCM-SHA256
0000 47 45 54 20 2F 20 48 54 54 50 2F 31 2E 31 0D 0A GET / HTTP/1.1..
0010 48 6F 73 74 3A 20 77 77 77 2E 70 65 72 64 75 2E Host: www.perdu.
0020 63 6F 6D 0D 0A 55 73 65 72 2D 41 67 65 6E 74 3A com..User-Agent:
0030 20 63 75 72 6C 2F 37 2E 36 38 2E 30 0D 0A 41 63 curl/7.68.0..Ac
-> curl (1290608) 208.97.177.124/443 TLS1.2 ECDHE-RSA-AES128-GCM-SHA256
0000 48 54 54 50 2F 31 2E 31 20 32 30 30 20 4F 4B 0D HTTP/1.1 200 OK.
0010 0A 44 61 74 65 3A 20 54 68 75 2C 20 31 39 20 4D .Date: Thu, 19 M
0020 61 79 20 32 30 32 32 20 31 38 3A 31 36 3A 30 31 ay 2022 18:16:01
0030 20 47 4D 54 0D 0A 53 65 72 76 65 72 3A 20 41 70 GMT..Server: Ap
```
The `--secrets` arguments will display TLS Master Secrets extracted from memory. The following example leverages `--write` to write master secrets to simplify decrypting TLS messages with Scapy:
```shell
(sleep 5; curl https://www.perdu.com/?name=highly%20secret%20information --tls-max 1.2 --http1.1 --tlsv1.2) &
peetch tls --write &
curl (1293232) 208.97.177.124/443 TLS1.2 ECDHE-RSA-AES128-GCM-SHA256
peetch dump --write traffic.pcapng
^C
# Add the master secret to a PCAPng file
editcap --inject-secrets tls,1293232-master_secret.log traffic.pcapng traffic-ms.pcapng
scapy
>>> load_layer("tls")
>>> conf.tls_session_enable = True
>>> l = rdpcap("traffic-ms.pcapng")
>>> l[13][TLS].msg
[<TLSApplicationData data='GET /?name=highly%20secret%20information HTTP/1.1\r\nHost: www.perdu.com\r\nUser-Agent: curl/7.68.0\r\nAccept: */*\r\n\r\n' |>]
```
### `proxy`
This sub-command uses eBPF programs to automatically intercept TLS traffic from processes using OpenSSL and decrypt messages on the fly using Scapy.
In the following example, `peetch proxy` display a secret value sent to a server by the `openssl` process.
```shell
peetch proxy
[-] Proxying OpenSSL traffic
[+] Intercepting traffic from openssl/451255 to 172.67.133.176/443 via 127.0.0.1/58039
--> 127.0.0.1:58039 > 172.67.133.176:https tcp
<-- 172.67.133.176:https > 127.0.0.1:58039 tcp
--> 127.0.0.1:58039 > 172.67.133.176:https tcp
<-- 172.67.133.176:https > 127.0.0.1:58039 tcp
--> 127.0.0.1:58039 > 172.67.133.176:https tcp
--> 127.0.0.1:58039 > 172.67.133.176:https tcp
###[ TLS Application Data ]###
data = b'GET /?secret=9590 HTTP/1.1\r\nHost: www.perdu.com\r\n\r\n\n'
```
## Limitations
By design, `peetch` only supports OpenSSL, IPv4 and TLS 1.2.
================================================
FILE: doc/notes.md
================================================
# Notes
This document contains various information used to debug and test `peetch` features.
# Tests
* `openssl s_client`
```
rm secrets.txt ; (sleep 1 ;echo -e "GET /?secret=$RANDOM HTTP/1.1\r\nHost: www.perdu.com\r\n\r\n") |openssl s_client -connect www.perdu.com:443 -keylogfile secrets.txt -no_tls1_3 -4; cat secrets.txt
```
* test the connectin to the proxy
```
curl --connect-to www.perdu.com:443:127.0.0.1:2807 https://www.perdu.com
```
* libcurl binaries
```
# TLS1.2 & HTTP/1.1
curl https://echo.free.beeceptor.com/?secret_number=$RANDOM --tls-max 1.2 --http1.1 --tlsv1.2 --libcurl secret_binary.c
cc -o secret_binary secret_binary.c -lssl -lcurl && ./secret_binary
# TLS1.2 & HTTP/2.0
curl https://echo.free.beeceptor.com/?secret_number=$RANDOM --tls-max 1.2 --http2 --tlsv1.2 --libcurl secret_binary2.c
cc -o secret_binary2 secret_binary2.c -lssl -lcurl && ./secret_binary2
```
# OpenSSL Offsets
The following radare2 commands could be used to validate the OpenSSL offsets dynamically generated by `peetch`:
```
cat curl.rr2
#!/usr/bin/rarun2
program=/usr/bin/curl
arg0=5
arg1=--tls-max
arg2=1.2
arg3=--tlsv1.2
arg4=--http1.1
arg5=https://www.perdu.com
radare2 -e dbg.profile=curl.rr2 -A -d /usr/bin/curl
[...]> dcu sym.imp.curl_globa_init
[...]> dmi libssl SSL_read
[...]> dmi libssl SSL_write
[...]> db 0xffffa479eeb4 # address of SSL_read
[...]> db 0xffff9086f504 # address of SSL_write
[...]> dc
[...]> px 48 @ `pv @ x0 + 0x918` + 0x50 # offset off ssl_session and master_secret
- offset - 6061 6263 6465 6667 6869 6A6B 6C6D 6E6F 0123456789ABCDEF
0xaaab0a47aa60 ce6a 7675 5e95 dfd4 e5ed 10c1 c0b7 9bd9 .jvu^...........
0xaaab0a47aa70 808f 416a 13ef cb29 6c8e 323a 40cb e5ea ..Aj...)l.2:@...
0xaaab0a47aa80 ccdb 09d2 7f46 7fb9 7115 6082 f4dc 2725 .....F..q.`...'%
```
```
================================================
FILE: peetch/__init__.py
================================================
# SPDX-License-Identifier: GPL-2.0+
# Guillaume Valadon <gvaladon@quarkslab.com>
import argparse
import asyncio
import atexit
import ctypes as ct
import binascii
import os
import socket
import struct
import sys
import time
from bcc import BPF, BPFProgType, BPFAttachType
import pyroute2
from scapy.all import Ether, wrpcapng, hexdump, load_layer, conf
import peetch.globals
from peetch.proxy import all_tasks
import peetch.utils
load_layer("tls")
conf.tls_session_enable = True
global BPF_HANDLER, BPF_TLS_HANDLER
EBPF_PROGRAMS_DIRNAME = os.path.join(os.path.dirname(__file__),
"ebpf_programs/")
BPF_DUMP_PROGRAM_FILENAME = "%s/peetch_kprobes.c" % EBPF_PROGRAMS_DIRNAME
BPF_DUMP_PROGRAM_SOURCE = open(BPF_DUMP_PROGRAM_FILENAME).read()
BPF_TLS_PROGRAM_FILENAME = "%s/peetch_uprobes.c" % EBPF_PROGRAMS_DIRNAME
BPF_TLS_PROGRAM_SOURCE = open(BPF_TLS_PROGRAM_FILENAME).read()
BPF_PROXY_PROGRAM_FILENAME = "%s/peetch_proxy.c" % EBPF_PROGRAMS_DIRNAME
BPF_PROXY_PROGRAM_SOURCE = open(BPF_PROXY_PROGRAM_FILENAME).read()
PACKETS_CAPTURED = []
TLS_INFORMATION = {}
def load_classifier(interface, ebpf_function):
"""
Load an eBPF TC Classifier
"""
iproute_handler = pyroute2.IPRoute()
ip_link = iproute_handler.link_lookup(ifname=interface)
if not ip_link:
sys.exit()
ip_link = ip_link[0]
iproute_handler.tc("add", "clsact", ip_link)
# add ingress clsact
iproute_handler.tc("add-filter", "bpf", ip_link, ":1",
fd=ebpf_function.fd, name=ebpf_function.name,
parent="ffff:fff2")
# add egress clsact
iproute_handler.tc("add-filter", "bpf", ip_link, ":1",
fd=ebpf_function.fd, name=ebpf_function.name,
parent="ffff:fff3")
def unload_classifier(interface):
"""
Unload an eBPF TC Classifier
"""
os.system("tc qdisc del dev %s clsact" % args.interface)
def exit_handler_command(interface, filename, bpf_handler):
"""
Exit command nicely
"""
time.sleep(0.01)
bpf_handler.detach_kprobe(event="security_sk_classify_flow",
fn_name="kprobe_security_sk_classify_flow")
unload_classifier(interface)
if filename:
wrpcapng(filename, PACKETS_CAPTURED)
def exit_handler_proxy(bpf_handler, connect_function, cgroup_fd):
"""
Exit proxy nicely
"""
time.sleep(0.01)
bpf_handler.detach_func(connect_function, cgroup_fd,
BPFAttachType.CGROUP_INET4_CONNECT)
if cgroup_fd > 0:
os.close(cgroup_fd)
def handle_skb_event(cpu, data, size):
"""
Handle SKB events from the kernel
"""
# Structure retrieved from the kernel
class SkbEvent(ct.Structure):
_fields_ = [("pid", ct.c_uint32),
("raw", ct.c_ubyte * (size - ct.sizeof(ct.c_uint32)))]
# Map the data from kernel to the structure
skb_event = ct.cast(data, ct.POINTER(SkbEvent)).contents
data = bytes(skb_event.raw)
# Extract the process name
for i in range(len(data)):
if data[i] == 0:
break
process_name = data[:i].decode("utf-8", "replace")
data = data[16:]
process_information = "%s/%d" % (process_name, skb_event.pid)
# Parse the packet with Scapy
pkt = Ether(data)
if args.write:
pkt.comment = str(process_information)
PACKETS_CAPTURED.append(pkt)
else:
if not args.raw:
print(process_information, end=" - ")
print(pkt.summary())
def dump_command(args):
# Compile eBPF programs
bpf_handler = BPF(text=BPF_DUMP_PROGRAM_SOURCE)
# Attach the kprobe
bpf_handler.attach_kprobe(event="security_sk_classify_flow",
fn_name="kprobe_security_sk_classify_flow")
# Setup the exit handler
atexit.register(exit_handler_command, args.interface, args.write,
bpf_handler)
# Load eBPF TC Classifier
classifier_function = bpf_handler.load_func("process_frame", BPF.SCHED_CLS)
load_classifier(args.interface, classifier_function)
# Handle incoming skb events
bpf_handler["skb_events"].open_perf_buffer(handle_skb_event)
try:
while True:
bpf_handler.perf_buffer_poll()
except KeyboardInterrupt:
pass
def handle_tls_event(cpu, data, size):
class TLSEvent(ct.Structure):
_fields_ = [("address", ct.c_uint32),
("port", ct.c_uint16),
("tls_version", ct.c_uint16),
("comm", ct.c_char * 64),
("message", ct.c_uint8 * 64),
("message_length", ct.c_uint32),
("pid", ct.c_uint32),
("is_read", ct.c_uint32)]
# Map the data from kernel to the structure
tls_event = ct.cast(data, ct.POINTER(TLSEvent)).contents
# Get TLS information
pid_to_delete = None
master_secret = None
ciphersuite = None
bpf_map_tls_information = BPF_TLS_HANDLER["tls_information_cache"]
for pid, tls_info in bpf_map_tls_information.items_lookup_batch():
if pid.value == tls_event.pid:
ciphersuite = tls_info.ciphersuite.decode("ascii", "ignore")
master_secret = binascii.hexlify(tls_info.master_secret)
master_secret = master_secret.decode("ascii", "ignore")
pid_to_delete = [pid]
break
# Delete pid from the eBPF map
if not pid_to_delete:
bpf_map_tls_information.items_delete_batch(pid_to_delete)
# Unpack the IPv4 destination address
addr = struct.pack("I", tls_event.address)
# Discard empty content
if args.content and tls_event.message_length == 0:
return
# Display the TLS event
if args.directions:
if tls_event.is_read:
print("->", end=" ")
else:
print("<-", end=" ")
print("%s (%d)" % (tls_event.comm.decode("ascii", "replace"),
tls_event.pid), end=" ")
print("%s/%d" % (socket.inet_ntop(socket.AF_INET, addr),
socket.ntohs(tls_event.port)), end=" ")
version = (tls_event.tls_version & 0xF) - 1
print("TLS1.%d %s" % (version, ciphersuite))
# Display TLS secrets
if (args.secrets or args.write) and tls_event.tls_version == 0x303:
key_log = "CLIENT_RANDOM 28071980 %s\n" % master_secret
if args.secrets:
print("\n %s\n" % key_log)
if args.write:
fd = open("%d-master_secret.log" % pid.value, "w")
fd.write(key_log)
fd.close()
# Display the message content in hexadecimal
if args.content and tls_event.message_length:
hex_message = hexdump(tls_event.message[:tls_event.message_length],
dump=True)
print("\n ", end="")
print(hex_message.replace("\n", "\n "))
print()
def _tls_ebpf_programs(directions_bool, args_ssl_session_offset,
args_ssl_cipher_offset, args_master_secret_offset,
args_client_hello_offset, args_client_random_offset):
# Get SSL structures offsets
offsets = [str(offset) for offset in peetch.utils.get_offsets()]
ssl_session_offset, ssl_cipher_offset, master_secret_offset, \
client_hello_offset, client_random_offset = offsets
if ssl_session_offset == ssl_cipher_offset and \
ssl_cipher_offset == master_secret_offset and master_secret_offset == '0': # noqa: E501
return None
if args_ssl_session_offset is not None:
ssl_session_offset = str(args_ssl_session_offset)
if args_ssl_cipher_offset is not None:
ssl_cipher_offset = str(args_ssl_cipher_offset)
if args_master_secret_offset is not None:
master_secret_offset = str(args_master_secret_offset)
if args_client_hello_offset is not None:
client_hello_offset = str(args.client_hello_offset)
if args_client_random_offset is not None:
client_random_offset = str(args.client_random_offset)
# Compile eBPF programs
ebpf_programs = BPF_TLS_PROGRAM_SOURCE.replace("DIRECTIONS",
directions_bool)
ebpf_programs = ebpf_programs.replace("SSL_SESSION_OFFSET",
ssl_session_offset)
ebpf_programs = ebpf_programs.replace("MASTER_SECRET_OFFSET",
master_secret_offset)
ebpf_programs = ebpf_programs.replace("SSL_CIPHER_OFFSET",
ssl_cipher_offset)
ebpf_programs = ebpf_programs.replace("CLIENT_HELLO_OFFSET",
client_hello_offset)
ebpf_programs = ebpf_programs.replace("CLIENT_RANDOM_OFFSET",
client_random_offset)
return ebpf_programs
def tls_command(args):
global BPF_TLS_HANDLER
# Process arguments
if args.content:
args.directions = True
directions_bool = "1"
if args.directions:
directions_bool = "0"
ebpf_programs = _tls_ebpf_programs(directions_bool,
args.ssl_session_offset,
args.ssl_cipher_offset,
args.master_secret_offset,
args.client_hello_offset,
args.client_random_offset)
if ebpf_programs is None:
print("ERROR: cannot guess SSL offsets!", file=sys.stderr)
sys.exit(1)
bpf_handler = BPF(text=ebpf_programs)
BPF_TLS_HANDLER = bpf_handler
# Attach the probes
try:
bpf_handler.attach_uprobe(name="ssl",
sym="SSL_write", fn_name="SSL_write")
bpf_handler.attach_uprobe(name="ssl",
sym="SSL_read", fn_name="SSL_read")
bpf_handler.attach_uretprobe(name="ssl",
sym="SSL_read", fn_name="SSL_read_ret")
except Exception:
print("tls - cannot attach to eBPF probes!")
sys.exit()
def handle_tls_event(cpu, data, size):
class TLSEvent(ct.Structure):
_fields_ = [("address", ct.c_uint32),
("port", ct.c_uint16),
("tls_version", ct.c_uint16),
("comm", ct.c_char * 64),
("message", ct.c_uint8 * 64),
("message_length", ct.c_uint32),
("pid", ct.c_uint32),
("is_read", ct.c_uint32)]
# Map the data from kernel to the structure
tls_event = ct.cast(data, ct.POINTER(TLSEvent)).contents
# Get TLS information
pid_to_delete = None
master_secret = None
ciphersuite = None
client_random = None
bpf_map_tls_information = bpf_handler["tls_information_cache"]
for pid, tls_info in bpf_map_tls_information.items_lookup_batch():
if pid.value == tls_event.pid:
ciphersuite = tls_info.ciphersuite.decode("ascii", "ignore")
master_secret = binascii.hexlify(tls_info.master_secret)
master_secret = master_secret.decode("ascii", "ignore")
client_random = binascii.hexlify(tls_info.client_random)
client_random = client_random.decode("ascii", "ignore")
pid_to_delete = [pid]
break
# Delete pid from the eBPF map
if not pid_to_delete:
bpf_map_tls_information.items_delete_batch(pid_to_delete)
# Unpack the IPv4 destination address
addr = struct.pack("I", tls_event.address)
# Discard empty content
if args.content and tls_event.message_length == 0:
return
# Display the TLS event
if args.directions:
if tls_event.is_read:
print("->", end=" ")
else:
print("<-", end=" ")
print("%s (%d)" % (tls_event.comm.decode("ascii", "replace"),
tls_event.pid), end=" ")
print("%s/%d" % (socket.inet_ntop(socket.AF_INET, addr),
socket.ntohs(tls_event.port)), end=" ")
version = (tls_event.tls_version & 0xF) - 1
print("TLS1.%d %s" % (version, ciphersuite))
# Display TLS secrets
if (args.secrets or args.write) and tls_event.tls_version == 0x303:
key_log = "CLIENT_RANDOM %s %s\n" % (client_random, master_secret)
if args.secrets:
print("\n %s\n" % key_log)
if args.write:
fd = open("%d-master_secret.log" % pid.value, "w")
fd.write(key_log)
fd.close()
# Display the message content in hexadecimal
if args.content and tls_event.message_length:
hex_message = hexdump(tls_event.message[:tls_event.message_length],
dump=True)
print("\n ", end="")
print(hex_message.replace("\n", "\n "))
print()
bpf_handler["tls_events"].open_perf_buffer(handle_tls_event)
while True:
try:
bpf_handler.perf_buffer_poll()
except KeyboardInterrupt:
sys.exit()
def proxy_command(args):
# Compile eBPF programs
ebpf_programs = BPF_PROXY_PROGRAM_SOURCE.replace("PEETCH_PROXY_PID",
str(os.getpid()))
bpf_handler = BPF(text=ebpf_programs)
peetch.globals.BPF_HANDLER = bpf_handler
# Load the eBPF function
connect_function = bpf_handler.load_func("connect_v4_prog",
prog_type=BPFProgType.CGROUP_SOCK_ADDR, # noqa: E501
attach_type=BPFAttachType.CGROUP_INET4_CONNECT) # noqa: E501
# Attach the eBPF function to the default cgroup
cgroup_fd = os.open("/sys/fs/cgroup", os.O_RDONLY)
bpf_handler.attach_func(connect_function, cgroup_fd,
BPFAttachType.CGROUP_INET4_CONNECT)
# Attach the SSL_* uprobes
ebpf_programs = _tls_ebpf_programs("1", None, None, None, None, None)
if ebpf_programs is None:
print("ERROR: cannot guess SSL offsets!", file=sys.stderr)
sys.exit(1)
bpf_tls_handler = BPF(text=ebpf_programs)
peetch.globals.BPF_TLS_HANDLER = bpf_tls_handler
try:
bpf_tls_handler.attach_uprobe(name="ssl",
sym="SSL_write", fn_name="SSL_write")
bpf_tls_handler.attach_uprobe(name="ssl",
sym="SSL_read", fn_name="SSL_read")
bpf_tls_handler.attach_uretprobe(name="ssl",
sym="SSL_read", fn_name="SSL_read_ret") # noqa: E501
except Exception:
print("proxy - cannot attach to eBPF SSL_* uprobes!")
sys.exit()
print("[-] Proxying OpenSSL traffic")
# Setup the exit handler
atexit.register(exit_handler_proxy, bpf_handler,
connect_function, cgroup_fd)
# Start the proxy
try:
asyncio.run(all_tasks(args.debug))
except KeyboardInterrupt:
pass
def main():
global args
argv = sys.argv[1:]
# Parsing arguments
parser = argparse.ArgumentParser(description="peetch - an eBPF playground")
subparser = parser.add_subparsers()
parser.set_defaults(func=lambda args: parser.print_help())
# Prepare the 'dump' subcommand
dump_parser = subparser.add_parser("dump",
help="Sniff packets with eBPF")
dump_parser.add_argument("--raw", action="store_true",
help="display packets only")
dump_parser.add_argument("--write", type=str,
help="pcapng filename")
dump_parser.add_argument("--interface", type=str,
help="interface name", default=str(conf.iface))
dump_parser.set_defaults(func=dump_command)
# Prepare the 'tls' subcommand
tls_parser = subparser.add_parser("tls",
help="Identify processes that uses TLS")
tls_parser.add_argument("--directions", action="store_true",
help="display read & write calls")
tls_parser.add_argument("--content", action="store_true",
help="display buffers content")
tls_parser.add_argument("--secrets", action="store_true",
help="display TLS secrets")
tls_parser.add_argument("--write", action="store_true",
help="write TLS secrets to files")
tls_parser.add_argument("--ssl_session_offset",
help="offset to the ssl_session_t structure")
tls_parser.add_argument("--master_secret_offset",
help="offset to the master secret in an ssl_session_t structure") # noqa: E501
tls_parser.add_argument("--ssl_cipher_offset",
help="offset to the ssl_cipher structure in an ssl_session_t structure") # noqa: E501
tls_parser.add_argument("--client_hello_offset",
help="offset to the CLIENTHELLO_MSG structure in an ssl structure") # noqa: E501
tls_parser.add_argument("--client_random_offset",
help="offset to the client random in an CLIENTHELLO_MSG structure") # noqa: E501
tls_parser.set_defaults(func=tls_command)
# Prepare the 'proxy' subcommand
proxy_parser = subparser.add_parser("proxy",
help="Automatically intercept TLS connections") # noqa: E501
proxy_parser.add_argument("--debug", action="store_true",
help="display debug information")
proxy_parser.set_defaults(func=proxy_command)
# Print the Help message when no arguments are provided
if not argv:
parser.print_help(sys.stderr)
sys.exit(1)
# Call the sub-command
args = parser.parse_args(argv)
args.func(args)
================================================
FILE: peetch/__main__.py
================================================
#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0+
# Guillaume Valadon <gvaladon@quarkslab.com>
from . import main
main()
================================================
FILE: peetch/c_utils/libssl.c
================================================
// SPDX-License-Identifier: GPL-2.0+
// Guillaume Valadon <gvaladon@quarkslab.com>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <openssl/ssl.h>
#define STRUCTURE_SIZE 8192
struct libssl_offsets_t {
uint64_t ssl_session;
uint64_t ssl_cipher;
uint64_t master_secret;
uint64_t client_hello;
uint64_t client_random;
};
struct libssl_offsets_t libssl_offsets(char *ip4_address, uint16_t port) {
struct libssl_offsets_t offsets = { .ssl_session = 0,
.ssl_cipher = 0, .master_secret = 0};
// Create the SSL context and set the TLS version
const SSL_METHOD *method = TLS_client_method();
SSL_CTX *ctx = SSL_CTX_new(method);
int ret = SSL_CTX_set_max_proto_version(ctx, TLS1_2_VERSION);
if (ret < 0) {
printf("SSL_CTX_set_max_proto_version() error - %d\n", ret);
return offsets;
}
// Set up a TLS connection to get the SSL session structure
SSL *ssl = SSL_new(ctx);
int fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0) {
printf("socket() error - %d\n", fd);
return offsets;
}
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
ret = inet_aton(ip4_address, (struct in_addr*) &addr.sin_addr.s_addr);
if (ret < 0) {
printf("inet_aton() error - %d\n", fd);
return offsets;
}
ret = connect(fd, (struct sockaddr*) &addr, sizeof(addr));
if (ret < 0) {
printf("connect() error - %d\n", fd);
return offsets;
}
ret = SSL_set_fd(ssl, fd);
if (ret < 0) {
printf("SSL_set_fd() error - %d\n", fd);
return offsets;
}
ret = SSL_connect(ssl);
if (ret < 0) {
printf("SSL_connect() error - %d\n", fd);
return offsets;
}
// SSL_SESSION* offset
SSL_SESSION *session = SSL_get_session(ssl);
for (uint64_t i = 0x000; i < STRUCTURE_SIZE; i++) {
uint64_t value = (uint64_t) ssl + i;
uint64_t *ptr = (uint64_t*) value;
if ((uint64_t) *ptr == (uint64_t) session) {
offsets.ssl_session = i;
break;
}
}
// SSL_CIPHER* offset
const SSL_CIPHER *cipher = SSL_get_current_cipher(ssl);
for (uint64_t i = 0x000; i < STRUCTURE_SIZE; i++) {
uint64_t value = (uint64_t) session + i;
uint64_t *ptr = (uint64_t*) value;
if ((uint64_t) *ptr == (uint64_t) cipher) {
offsets.ssl_cipher = i;
break;
}
}
// TLS 1.2 MASTER_SECRET offset
uint8_t master_secret[48];
ret = SSL_SESSION_get_master_key(session,
(unsigned char*)&master_secret, sizeof(master_secret));
if (ret != 48) {
printf("SSL_SESSION_get_master_key() error - %d\n", fd);
return offsets;
}
for (uint64_t i=0x000; i < STRUCTURE_SIZE; i++) {
uint64_t value = (uint64_t) session + i;
uint64_t *ptr = (uint64_t*) value;
value = (uint64_t) session + i + 47;
uint64_t *ptr_end = (uint64_t*) value;
if ((*ptr & 0xFF) == master_secret[0] && \
(*ptr_end & 0xFF) == master_secret[47]) {
offsets.master_secret = i;
break;
}
}
// Client Random offset
uint8_t client_random[32];
offsets.client_hello = 0;
ret = SSL_get_client_random(ssl, (unsigned char*)&client_random, sizeof(client_random));
if (ret != 32) {
printf("SSL_get_client_random() error - %d\n", fd);
return offsets;
}
for (uint64_t i=0; i < STRUCTURE_SIZE; i++) {
if (offsets.client_hello != 0)
break;
uint64_t value = (uint64_t) ssl + i;
uint64_t *ptr = (uint64_t*) value;
if (*ptr) {
for (uint8_t j=0; j < sizeof(STRUCTURE_SIZE) ; j++) {
uint8_t *new_ptr = (uint8_t*) ptr + j;
if ((new_ptr[0] & 0xFF) == client_random[0] && \
(new_ptr[31] & 0xFF) == client_random[31]) {
offsets.client_hello = i;
offsets.client_random = j;
break;
}
}
}
}
return offsets;
}
int main() {
/*
Compile it with:
cc -o libssl_offsets libssl.c -lssl
*/
struct libssl_offsets_t offsets = libssl_offsets("1.1.1.1", 443);
printf("--ssl_session_offset=0x%lx\n", offsets.ssl_session);
printf("--ssl_cipher_offset=0x%lx\n", offsets.ssl_cipher);
printf("--master_secret_offset=0x%lx\n", offsets.master_secret);
printf("--client_hello=0x%lx\n", offsets.client_hello);
printf("--client_random=0x%lx\n", offsets.client_random);
return EXIT_SUCCESS;
}
================================================
FILE: peetch/ebpf_programs/peetch_kprobes.c
================================================
// SPDX-License-Identifier: GPL-2.0+
// Guillaume Valadon <gvaladon@quarkslab.com>
#include <linux/if_ether.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <uapi/linux/pkt_cls.h>
#include <uapi/linux/bpf.h>
#include <linux/sched.h>
#include <net/sock.h>
struct key_t {
u32 dst;
u32 src;
};
struct data_t {
u32 pid;
char name[TASK_COMM_LEN];
};
BPF_HASH(pid_cache, struct key_t, struct data_t);
BPF_PERF_OUTPUT(skb_events);
int process_frame(struct __sk_buff *skb) {
// Data accessors
unsigned char *data = (void *)(long)skb->data;
unsigned char *data_end = (void *)(long)skb->data_end;
// Mapping data to the Ethernet and IP headers
struct ethhdr *eth = (struct ethhdr *)data;
struct iphdr *iph = (struct iphdr*) (data + sizeof(struct ethhdr));
// Simple length check
if ((data + sizeof(struct ethhdr) + sizeof(struct iphdr)) > data_end)
return TC_ACT_OK;
// Discard everything but IPv4
if (ntohs(eth->h_proto) != ETH_P_IP)
return TC_ACT_OK;
// Discard everything but TCP
if (iph->protocol != IPPROTO_TCP)
return TC_ACT_OK;
// Retrieve the PID and the process name from the IP addresses
struct key_t key = { .dst = iph->daddr, .src = iph->saddr };
struct data_t *value = (struct data_t *) pid_cache.lookup(&key);
if (value == NULL) {
key.dst = iph->saddr;
key.src = iph->daddr;
value = (struct data_t *) pid_cache.lookup(&key);
if (value == NULL)
return TC_ACT_OK;
}
// Check the PID
if (value->pid == 0)
return TC_ACT_OK;
struct data_t tmp;
__builtin_memset(&tmp, 0, sizeof(tmp)); // it makes the eBPF verifier happy!
tmp.pid = value->pid;
for (u8 i=0; i < TASK_COMM_LEN; i++)
tmp.name[i] = value->name[i];
skb_events.perf_submit_skb(skb, skb->len, &tmp, sizeof(tmp));
return TC_ACT_OK;
}
int kprobe_security_sk_classify_flow(struct pt_regs *ctx, struct sock *sk, struct flowi *fl) {
// Discard everything but IPv4
if (sk->sk_family != AF_INET)
return 0;
// Extract IPv4 related structures
union flowi_uli uli;
struct flowi4 ip4;
bpf_probe_read(&ip4, sizeof(ip4), &fl->u.ip4);
bpf_probe_read(&uli, sizeof(uli), &ip4.uli);
// Get IP addresses and ports
struct key_t key;
struct data_t data;
// it makes the eBPF verifier happy!
__builtin_memset(&key, 0, sizeof(key));
__builtin_memset(&data, 0, sizeof(data));
bpf_probe_read(&key.src,
sizeof(sk->__sk_common.skc_daddr),
&sk->__sk_common.skc_daddr);
bpf_probe_read(&key.dst,
sizeof(sk->__sk_common.skc_rcv_saddr),
&sk->__sk_common.skc_rcv_saddr);
// Get and store the PID
u64 id = bpf_get_current_pid_tgid();
data.pid = id >> 32;
// Get and store the process name
bpf_get_current_comm(data.name, sizeof(data.name));
// Store data
pid_cache.update(&key, &data);
return 0;
}
================================================
FILE: peetch/ebpf_programs/peetch_proxy.c
================================================
// SPDX-License-Identifier: GPL-2.0+
// Guillaume Valadon <gvaladon@quarkslab.com>
#include <linux/bpf.h>
#include <linux/in.h>
struct data_t {
u32 pid;
char name[64];
u32 ip;
u32 port;
};
BPF_HASH(pid_cache, u64);
BPF_HASH(destination_cache, u16, struct data_t);
int connect_v4_prog(struct bpf_sock_addr *ctx) {
struct data_t data;
// Get and store the PID
u64 id = bpf_get_current_pid_tgid();
data.pid = id >> 32;
// Do not intercept connection from peetch itself
if (PEETCH_PROXY_PID == data.pid)
return 1;
// Do not intercept well known TCP services
if (ctx->user_port == bpf_htons(53)) // DNS
return 1;
// Check if the PID is in the cache
u64 *tmp_id = pid_cache.lookup((u64*) &id);
if (tmp_id == NULL)
return 1;
if (*tmp_id != id)
return 1;
// Get and store the process name
bpf_get_current_comm(data.name, 64);
// Rewrite the source port
struct sockaddr_in sa = {};
sa.sin_family = AF_INET;
u16 new_port = bpf_htons(data.pid & 0xFFFF); // lower part of the PID will be used as the TCP source port
sa.sin_port = new_port;
sa.sin_addr.s_addr = bpf_htonl(0x7f000001); // 127.0.0.1
if (bpf_bind(ctx, (struct sockaddr *) &sa, sizeof(sa)) != 0)
return 0;
// Get and store the real destination IPv4 address and port
data.ip = ctx->user_ip4;
data.port = ctx->user_port;
// Store the connection data into the cache
destination_cache.update(&new_port, &data);
// Divert the connection to peetch proxy
ctx->user_ip4 = 0x0100007f;
ctx->user_port = bpf_htons(2807);
/*
Note:
- 1: accept
- 0: discard
*/
return 1;
}
TRACEPOINT_PROBE(syscalls, sys_enter_openat) {
#define _PATH_MAX 128
char filename[_PATH_MAX + 1];
// Retrieve the filename
long ret = bpf_probe_read((void*)&filename, _PATH_MAX, (void*)args->filename);
if (ret != 0) {
//bpf_trace_printk("sys_enter_openat() - bpf_probe_read() failed\n");
return 0;
}
// Check if the filename contains "libssl.so"
for (u16 i=8; i < _PATH_MAX; i++) {
if (filename[i-8] == 'l' && filename[i-7] == 'i' && filename[i-6] == 'b' && filename[i-5] == 's' &&
filename[i-4] == 's' && filename[i-3] == 'l' && filename[i-2] == '.' && filename[i-1] == 's') {
// Get and store the PID
u64 id = bpf_get_current_pid_tgid();
u64 pid = id >> 32;
pid_cache.update(&id, &id);
break;
}
}
return 0;
}
================================================
FILE: peetch/ebpf_programs/peetch_uprobes.c
================================================
// SPDX-License-Identifier: GPL-2.0+
// Guillaume Valadon <gvaladon@quarkslab.com>
#include <linux/in.h>
#include <linux/ptrace.h>
// Data structure sent to userland
struct tls_event_t {
u32 addr;
u16 port;
u16 tls_version;
#define COMM_MAX_LEN 64
char comm[COMM_MAX_LEN];
#define MESSAGE_MAX_LEN 64
u8 message[MESSAGE_MAX_LEN];
u32 message_length;
u32 pid;
u32 is_read;
};
BPF_PERF_OUTPUT(tls_events);
// Store SSL_* buffer information
struct SSL_buffer_t {
u64 ptr;
u32 length;
u32 tls_version;
u32 is_read;
};
BPF_HASH(SSL_read_buffers, u32, struct SSL_buffer_t);
// Store connect information indexed by PID
BPF_HASH(pid_cache, u32);
// TLS information
struct TLS_information_t {
u16 tls_version;
#define CIPHERSUITE_MAX_LEN 32
char ciphersuite[CIPHERSUITE_MAX_LEN];
#define MASTER_SECRET_MAX_LEN 48
u8 master_secret[MASTER_SECRET_MAX_LEN];
#define CLIENT_RANDOM_MAX_LEN 32
u8 client_random[CLIENT_RANDOM_MAX_LEN];
};
BPF_HASH(tls_information_cache, u32, struct TLS_information_t);
TRACEPOINT_PROBE(syscalls, sys_enter_connect) {
// Retrieve the sockaddr_in structure
struct sockaddr_in addr_in;
long ret = bpf_probe_read((void*)&addr_in, sizeof(addr_in), args->uservaddr);
if (ret != 0) {
bpf_trace_printk("sys_enter_connect() - bpf_probe_read() failed\n");
return 0;
}
// Discard everything but IPv4
if (addr_in.sin_family != AF_INET)
return 0;
// Retrieve the PID
u32 pid = bpf_get_current_pid_tgid() & 0xFFFFFFFF;
// Store a TLS event in the pid_cache
struct tls_event_t event = { .port = addr_in.sin_port,
.addr = addr_in.sin_addr.s_addr};
pid_cache.update(&pid, (u64*)&event);
return 0;
}
// Dummy openssl ssl_st structure
struct ssl_st {
int version;
};
static u16 get_tls_version(void *ssl_st_ptr) {
// Extract the TLS version from a struct ssl_str pointer
struct ssl_st ssl;
long ret = bpf_probe_read(&ssl, sizeof(ssl), ssl_st_ptr);
if (ret != 0) {
bpf_trace_printk("get_tls_version() - bpf_probe_read() failed\n");
return -1;
}
return ssl.version;
}
static void parse_session(struct pt_regs *ctx, u16 tls_version) {
// Parse a struct sl_session_st pointer and send
// data to userspace
// TLS information sent to userspace
struct TLS_information_t tls_information;
__builtin_memset(&tls_information, 0, sizeof(tls_information)); // it makes the eBPF verifier happy!
tls_information.tls_version = tls_version;
// Get a ssl_st pointer
void *ssl_st_ptr = (void *) PT_REGS_PARM1(ctx);
// Get a ssl_session_st pointer
u64 *ssl_session_st_ptr = (u64 *) (ssl_st_ptr + SSL_SESSION_OFFSET);
u64 address;
long ret = bpf_probe_read(&address, sizeof(address), ssl_session_st_ptr);
if (ret != 0)
bpf_trace_printk("parse_session() #1 - bpf_probe_read() failed\n");
// Access the TLS 1.2 master secret
void *ms_ptr = (void *) (address + MASTER_SECRET_OFFSET);
ret = bpf_probe_read(&tls_information.master_secret,
sizeof(tls_information.master_secret), ms_ptr);
if (ret != 0)
bpf_trace_printk("parse_session() #2 - bpf_probe_read() failed\n");
// Get a ssl_cipher_st pointer
void *ssl_cipher_st_ptr = (void *) (address + SSL_CIPHER_OFFSET);
ret = bpf_probe_read(&address, sizeof(address), ssl_cipher_st_ptr);
if (ret != 0)
bpf_trace_printk("parse_session() #3 - bpf_probe_read() failed\n");
// Get the SSL_cipher_st point to the name member
ssl_cipher_st_ptr = (void *) (address + 8);
ret = bpf_probe_read(&address, sizeof(address), ssl_cipher_st_ptr);
if (ret != 0)
bpf_trace_printk("parse_session() #4 - bpf_probe_read() failed\n");
// Access the TLS ciphersuite
void *cs_ptr = (void *) address;
ret = bpf_probe_read(&tls_information.ciphersuite,
sizeof(tls_information.ciphersuite), cs_ptr);
if (ret != 0)
bpf_trace_printk("parse_session() #5 - bpf_probe_read() failed\n");
// Retrieve the Client Random
void* client_hello_ptr = (void *) (ssl_st_ptr + CLIENT_HELLO_OFFSET);
ret = bpf_probe_read(&address, sizeof(address), client_hello_ptr);
if (ret != 0)
bpf_trace_printk("parse_session() #6 - bpf_probe_read() failed\n");
u8 client_random[CLIENT_RANDOM_MAX_LEN + CLIENT_RANDOM_OFFSET];
ret = bpf_probe_read(client_random, sizeof(client_random), client_hello_ptr);
if (ret != 0)
bpf_trace_printk("parse_session() #7 - bpf_probe_read() failed\n");
ret = bpf_probe_read(&tls_information.client_random, sizeof(tls_information.client_random), client_random + CLIENT_RANDOM_OFFSET);
if (ret != 0)
bpf_trace_printk("parse_session() #8 - bpf_probe_read() failed\n");
u32 pid = bpf_get_current_pid_tgid() & 0xFFFFFFFF;
tls_information_cache.update(&pid, &tls_information);
}
static int SSL_read_write(struct pt_regs *ctx, u16 tls_version, struct SSL_buffer_t *buffer) {
// A buffer is needed
if (buffer == NULL)
return 0;
// Retrieve connect() information for PID
u32 pid = bpf_get_current_pid_tgid() & 0xFFFFFFFF;
struct tls_event_t *event = (struct tls_event_t*) pid_cache.lookup(&pid);
if (event == NULL) {
//get ppid to check if it is a child of a known process
struct task_struct *task;
task = (struct task_struct *)bpf_get_current_task();
pid = task->real_parent->tgid;
event = (struct tls_event_t*) pid_cache.lookup(&pid);
if(event == NULL)
return 0;
}
// Build a new TLS event and fill it
struct tls_event_t new_event;
bpf_get_current_comm(&new_event.comm, COMM_MAX_LEN);
new_event.pid = pid;
new_event.port = event->port;
new_event.addr = event->addr;
new_event.is_read = buffer->is_read;
new_event.tls_version = tls_version;
long ret = bpf_probe_read(&new_event.message,
sizeof(new_event.message), (void*) buffer->ptr);
if (ret != 0) {
bpf_trace_printk("SSL_read_write() - bpf_probe_read() failed\n");
return 0;
}
new_event.message_length = buffer->length;
// Send the event to userland
tls_events.perf_submit(ctx, &new_event, sizeof(new_event));
// Flush the PID cache
if (DIRECTIONS) // this will be replaced by a boolean in Python
pid_cache.delete(&pid);
return 0;
}
int SSL_read(struct pt_regs *ctx) {
// Retrieve the PID
u32 pid = bpf_get_current_pid_tgid() & 0xFFFFFFFF;
// Store a SSL read buffer information in the cache
struct SSL_buffer_t buffer;
__builtin_memset(&buffer, 0, sizeof(buffer));
buffer.ptr = PT_REGS_PARM2(ctx);
// Get TLS version
void *ssl_st_ptr = (void *) PT_REGS_PARM1(ctx);
buffer.tls_version = get_tls_version(ssl_st_ptr);
SSL_read_buffers.update(&pid, &buffer);
return 0;
}
int SSL_read_ret(struct pt_regs *ctx) {
// Discard if nothing was received
int buffer_length = PT_REGS_RC(ctx);
if (buffer_length == -1)
return 0;
// Retrieve SSL read buffers information for PID
u32 pid = bpf_get_current_pid_tgid() & 0xFFFFFFFF;
struct SSL_buffer_t *buffer = (struct SSL_buffer_t*) SSL_read_buffers.lookup(&pid);
if (buffer == NULL)
return 0;
// Add buffer information
buffer->length = buffer_length;
buffer->is_read = 1;
long ret = SSL_read_write(ctx, buffer->tls_version, buffer);
SSL_read_buffers.delete(&pid);
return ret;
}
int SSL_write(struct pt_regs *ctx) {
// Retrieve the buffer information
struct SSL_buffer_t buffer;
buffer.ptr = PT_REGS_PARM2(ctx);
buffer.length = PT_REGS_PARM3(ctx);
buffer.is_read = 0;
// Get TLS version
void *ssl_st_ptr = (void *) PT_REGS_PARM1(ctx);
u16 tls_version = get_tls_version(ssl_st_ptr);
parse_session(ctx, tls_version);
return SSL_read_write(ctx, tls_version, &buffer);
}
================================================
FILE: peetch/globals.py
================================================
# SPDX-License-Identifier: GPL-2.0+
# Guillaume Valadon <gvaladon@quarkslab.com>
BPF_HANDLER = None
BPF_TLS_HANDLER = None
PACKETS_CAPTURED = []
TLS_INFORMATION = {}
================================================
FILE: peetch/proxy.py
================================================
# SPDX-License-Identifier: GPL-2.0+
# Guillaume Valadon <gvaladon@quarkslab.com>
import asyncio
import binascii
import ctypes as ct
import socket
import struct
import sys
import time
from scapy.all import sniff, IP, TCP, conf
import peetch.globals
def retrieve_client_information(bpf_handler, port_src):
"""
Get client information from eBPF maps
"""
process_name, process_pid, ip_dst, port_dst = [None] * 4
bpf_map_destination_cache = bpf_handler["destination_cache"]
destination_key_to_delete = None
for destination_key, destination_data in bpf_map_destination_cache.items_lookup_batch(): # noqa: E501
process_pid = destination_data.pid
process_name = destination_data.name.decode("ascii", "replace")
# Retrieve destination IP and port
address_packed = struct.pack("I", destination_data.ip)
ip_dst = socket.inet_ntop(socket.AF_INET, address_packed)
port_dst = socket.ntohs(destination_data.port)
if socket.ntohs(destination_key.value) == port_src:
ct_array = ct.c_uint16 * 1
destination_key_to_delete = ct_array(destination_key)
break
if destination_key_to_delete:
bpf_map_destination_cache.items_delete_batch(destination_key_to_delete)
return process_name, process_pid, ip_dst, port_dst
def retrieve_tls_information(bpf_handler, process_pid):
"""
Get TLS information from eBPF maps
"""
tls_version, ciphersuite, client_random, master_secret = [None] * 4
retries = 5
pid_to_delete = None
bpf_map_tls_information = bpf_handler["tls_information_cache"]
while pid_to_delete is None and retries:
retries -= 1
for pid, tls_info in bpf_map_tls_information.items_lookup_batch():
if pid.value == process_pid:
ciphersuite = tls_info.ciphersuite.decode("ascii", "ignore")
master_secret = binascii.hexlify(tls_info.master_secret)
master_secret = master_secret.decode("ascii", "ignore")
client_random = binascii.hexlify(tls_info.client_random)
client_random = client_random.decode("ascii", "ignore")
tls_version = (tls_info.tls_version & 0xF) - 1
if len(ciphersuite):
ct_array = ct.c_uint * 1
pid_to_delete = ct_array(pid)
break
#time.sleep(0.005)
# Delete pid from the eBPF map
if pid_to_delete:
bpf_map_tls_information.items_delete_batch(pid_to_delete)
return tls_version, ciphersuite, client_random, master_secret
async def dots():
"""
print dots
"""
while True:
await asyncio.sleep(0.5)
print(".", end="", flush=True)
def decrypt_messages(tls_information, packets):
"""
Decrypt and display messages
"""
tls_version = tls_information.get("version", sys.maxsize)
if tls_version < 3:
for p in sniff(offline=packets):
if TLSApplicationData in p: # noqa: F821
print()
p[TLSApplicationData].show() # noqa: F821
async def handle_client(local_reader, local_writer):
"""
Proxy a new client connection
"""
# Retrieve source IP and port used to connect to the proxy
ip_src, port_src = local_reader._transport.get_extra_info("peername")
# Retrieve process information, and destination IP and port
tmp = retrieve_client_information(peetch.globals.BPF_HANDLER, port_src)
process_name, process_pid, ip_dst, port_dst = tmp
if process_name is None:
print("[!] Did not find the real destination")
local_writer.close()
return
print("", flush=True)
print(f"\r[+] Intercepting traffic from {process_name}/{process_pid}", end="") # noqa: E501
print(f" to {ip_dst}/{port_dst} via {ip_src}/{port_src}")
try:
# Connect to the real destination and copy data between sockets
tmp = await asyncio.open_connection(ip_dst, port_dst)
remote_reader, remote_writer = tmp
pipe1 = pipe(local_reader, remote_writer, process_pid,
"-->", ip_src, ip_dst, port_src, port_dst)
pipe2 = pipe(remote_reader, local_writer, process_pid,
"<--", ip_dst, ip_src, port_dst, port_src)
await asyncio.gather(pipe1, pipe2)
# Decrypt and display TLS messages
decrypt_messages(peetch.globals.TLS_INFORMATION,
peetch.globals.PACKETS_CAPTURED)
# Reset global variables
conf.tls_nss_keys = {}
peetch.globals.TLS_INFORMATION = {}
peetch.globals.PACKETS_CAPTURED = []
except ConnectionResetError as e:
print(f" {e}")
finally:
local_writer.close()
async def pipe(reader, writer, pid, direction, ip_src, ip_dst, port_src, port_dst): # noqa: E501
""""
Copy data from one socket to another and retrieve TLS information
Inspired by https://stackoverflow.com/a/46422554
"""
try:
while not reader.at_eof():
data = await reader.read(8192)
if not len(data):
continue
# Rebuild the IP packet
tls_record = IP(dst=ip_dst, src=ip_src)
tls_record /= TCP(dport=port_dst, sport=port_src)
tls_record /= TLS(data) # noqa: F821
peetch.globals.PACKETS_CAPTURED += [tls_record]
# Display a short summary
sprintf_fmt = "%IP.src%:%TCP.sport% > %IP.dst%:%TCP.dport% %IP.proto%" # noqa: E501
summary = tls_record.sprintf(sprintf_fmt)
print(f" {direction} {summary}")
# Copy data to the other socket
writer.write(data)
# Get and store TLS information
tls_version, ciphersuite, client_random, master_secret = retrieve_tls_information(peetch.globals.BPF_TLS_HANDLER, pid) # noqa: E501
if ciphersuite:
if tls_version < 3:
client_random_bytes = binascii.unhexlify(client_random)
master_secret_bytes = binascii.unhexlify(master_secret)
conf.tls_nss_keys = {"CLIENT_RANDOM": {client_random_bytes: master_secret_bytes}} # noqa: E501
peetch.globals.TLS_INFORMATION = {"version": tls_version,
"ciphersuite": ciphersuite} # noqa: E501
finally:
writer.close()
async def tcp_proxy():
"""
async TCP proxy
"""
server = await asyncio.start_server(handle_client, "127.0.0.1", 2807)
await server.serve_forever()
async def all_tasks(debug):
"""
all proxy tasks
"""
tasks = [tcp_proxy()]
if debug:
tasks += [dots()]
await asyncio.gather(*tasks)
================================================
FILE: peetch/utils.py
================================================
# SPDX-License-Identifier: GPL-2.0+
# Guillaume Valadon <gvaladon@quarkslab.com>
import ctypes
import os
import os.path
import sys
# Identify the library path
dirname = os.path.dirname(__file__)
UTILS_LIB_PATH = None
for root, dirs, files in os.walk(dirname):
for file in files:
if file.startswith("utils_lib") and file.endswith(".so"):
UTILS_LIB_PATH = os.path.join(root, file)
break
class LIBSSLOffsets(ctypes.Structure):
_fields_ = [("ssl_session", ctypes.c_uint64),
("ssl_cipher", ctypes.c_uint64),
("master_secret", ctypes.c_uint64),
("client_hello", ctypes.c_uint64),
("client_random", ctypes.c_uint64)]
if UTILS_LIB_PATH:
libssl_offset = ctypes.CDLL(UTILS_LIB_PATH)
libssl_offset.libssl_offsets.argstypes = [ctypes.c_char_p, ctypes.c_uint16]
libssl_offset.libssl_offsets.restype = LIBSSLOffsets
def get_offsets(address_ipv4=b"1.1.1.1", port=443):
# Retrieve offsets inside SSL structures
raw_offsets = libssl_offset.libssl_offsets(address_ipv4, port)
return (raw_offsets.ssl_session,
raw_offsets.ssl_cipher,
raw_offsets.master_secret,
raw_offsets.client_hello,
raw_offsets.client_random)
else:
print("ERROR: cannot find the utils_lib dynamic library!", file=sys.stderr)
sys.exit(1)
if __name__ == "__main__":
print(["0x%x" % offset for offset in get_offsets()])
================================================
FILE: requirements.txt
================================================
scapy @ git+https://github.com/secdev/scapy@master
cryptography
pyroute2
================================================
FILE: setup.py
================================================
# SPDX-License-Identifier: GPL-2.0+
# Guillaume Valadon <gvaladon@quarkslab.com>
from distutils.core import setup, Extension
setup(name="peetch",
description="An eBPF playground",
author="Guillaume Valadon",
author_email="gvaladon@quarkslab.com",
version="0.2.0",
packages=["peetch"],
package_data={"peetch": ["ebpf_programs/peetch_*.c"]},
entry_points={"console_scripts": ["peetch=peetch:main"]},
ext_modules=[Extension("peetch.utils_lib", sources=["peetch/c_utils/libssl.c"], libraries=["ssl"])],
)
gitextract_b_gn6amn/ ├── Dockerfile ├── LICENSE.txt ├── README.md ├── doc/ │ └── notes.md ├── peetch/ │ ├── __init__.py │ ├── __main__.py │ ├── c_utils/ │ │ └── libssl.c │ ├── ebpf_programs/ │ │ ├── peetch_kprobes.c │ │ ├── peetch_proxy.c │ │ └── peetch_uprobes.c │ ├── globals.py │ ├── proxy.py │ └── utils.py ├── requirements.txt └── setup.py
SYMBOL INDEX (42 symbols across 7 files)
FILE: peetch/__init__.py
function load_classifier (line 41) | def load_classifier(interface, ebpf_function):
function unload_classifier (line 65) | def unload_classifier(interface):
function exit_handler_command (line 72) | def exit_handler_command(interface, filename, bpf_handler):
function exit_handler_proxy (line 84) | def exit_handler_proxy(bpf_handler, connect_function, cgroup_fd):
function handle_skb_event (line 95) | def handle_skb_event(cpu, data, size):
function dump_command (line 130) | def dump_command(args):
function handle_tls_event (line 155) | def handle_tls_event(cpu, data, size):
function _tls_ebpf_programs (line 226) | def _tls_ebpf_programs(directions_bool, args_ssl_session_offset,
function tls_command (line 270) | def tls_command(args):
function proxy_command (line 386) | def proxy_command(args):
function main (line 435) | def main():
FILE: peetch/c_utils/libssl.c
type libssl_offsets_t (line 12) | struct libssl_offsets_t {
function libssl_offsets (line 21) | struct libssl_offsets_t libssl_offsets(char *ip4_address, uint16_t port) {
function main (line 146) | int main() {
FILE: peetch/ebpf_programs/peetch_kprobes.c
type key_t (line 15) | struct key_t {
type data_t (line 20) | struct data_t {
function process_frame (line 29) | int process_frame(struct __sk_buff *skb) {
function kprobe_security_sk_classify_flow (line 76) | int kprobe_security_sk_classify_flow(struct pt_regs *ctx, struct sock *s...
FILE: peetch/ebpf_programs/peetch_proxy.c
type data_t (line 7) | struct data_t {
function connect_v4_prog (line 18) | int connect_v4_prog(struct bpf_sock_addr *ctx) {
FILE: peetch/ebpf_programs/peetch_uprobes.c
type tls_event_t (line 9) | struct tls_event_t {
type SSL_buffer_t (line 25) | struct SSL_buffer_t {
type TLS_information_t (line 39) | struct TLS_information_t {
type sockaddr_in (line 53) | struct sockaddr_in
type tls_event_t (line 68) | struct tls_event_t
type ssl_st (line 77) | struct ssl_st {
function u16 (line 82) | static u16 get_tls_version(void *ssl_st_ptr) {
function parse_session (line 96) | static void parse_session(struct pt_regs *ctx, u16 tls_version) {
function SSL_read_write (line 162) | static int SSL_read_write(struct pt_regs *ctx, u16 tls_version, struct S...
function SSL_read (line 211) | int SSL_read(struct pt_regs *ctx) {
function SSL_read_ret (line 230) | int SSL_read_ret(struct pt_regs *ctx) {
function SSL_write (line 253) | int SSL_write(struct pt_regs *ctx) {
FILE: peetch/proxy.py
function retrieve_client_information (line 17) | def retrieve_client_information(bpf_handler, port_src):
function retrieve_tls_information (line 47) | def retrieve_tls_information(bpf_handler, process_pid):
function dots (line 79) | async def dots():
function decrypt_messages (line 88) | def decrypt_messages(tls_information, packets):
function handle_client (line 101) | async def handle_client(local_reader, local_writer):
function pipe (line 146) | async def pipe(reader, writer, pid, direction, ip_src, ip_dst, port_src,...
function tcp_proxy (line 185) | async def tcp_proxy():
function all_tasks (line 193) | async def all_tasks(debug):
FILE: peetch/utils.py
class LIBSSLOffsets (line 19) | class LIBSSLOffsets(ctypes.Structure):
function get_offsets (line 32) | def get_offsets(address_ipv4=b"1.1.1.1", port=443):
Condensed preview — 15 files, each showing path, character count, and a content snippet. Download the .json file or copy for the full structured content (75K chars).
[
{
"path": "Dockerfile",
"chars": 1021,
"preview": "# SPDX-License-Identifier: GPL-2.0+\n# Guillaume Valadon <gvaladon@quarkslab.com>\n\nFROM ubuntu:22.04\n\nENV TZ=Europe/Paris"
},
{
"path": "LICENSE.txt",
"chars": 18092,
"preview": " GNU GENERAL PUBLIC LICENSE\n Version 2, June 1991\n\n Copyright (C) 1989, 1991 Fr"
},
{
"path": "README.md",
"chars": 5798,
"preview": "# peetch\n\n`peetch` is a collection of tools aimed at experimenting with different aspects of eBPF to bypass TLS protocol"
},
{
"path": "doc/notes.md",
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"preview": "# Notes\n\nThis document contains various information used to debug and test `peetch` features.\n\n# Tests\n\n* `openssl s_cli"
},
{
"path": "peetch/__init__.py",
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"preview": "# SPDX-License-Identifier: GPL-2.0+\n# Guillaume Valadon <gvaladon@quarkslab.com>\n\nimport argparse\nimport asyncio\nimport "
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"path": "peetch/__main__.py",
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"preview": "#!/usr/bin/env python3\n# SPDX-License-Identifier: GPL-2.0+\n# Guillaume Valadon <gvaladon@quarkslab.com>\n\nfrom . import m"
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"preview": "// SPDX-License-Identifier: GPL-2.0+\n// Guillaume Valadon <gvaladon@quarkslab.com>\n\n#include <arpa/inet.h>\n#include <net"
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"path": "peetch/ebpf_programs/peetch_kprobes.c",
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"preview": "// SPDX-License-Identifier: GPL-2.0+\n// Guillaume Valadon <gvaladon@quarkslab.com>\n\n#include <linux/if_ether.h>\n#include"
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"path": "peetch/ebpf_programs/peetch_proxy.c",
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"preview": "// SPDX-License-Identifier: GPL-2.0+\n// Guillaume Valadon <gvaladon@quarkslab.com>\n\n#include <linux/bpf.h>\n#include <lin"
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"preview": "// SPDX-License-Identifier: GPL-2.0+\n// Guillaume Valadon <gvaladon@quarkslab.com>\n\n#include <linux/in.h>\n#include <linu"
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"path": "peetch/globals.py",
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"preview": "# SPDX-License-Identifier: GPL-2.0+\n# Guillaume Valadon <gvaladon@quarkslab.com>\n\nBPF_HANDLER = None\nBPF_TLS_HANDLER = N"
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"path": "peetch/proxy.py",
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"preview": "# SPDX-License-Identifier: GPL-2.0+\n# Guillaume Valadon <gvaladon@quarkslab.com>\n\nimport asyncio\nimport binascii\nimport "
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"path": "peetch/utils.py",
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"preview": "# SPDX-License-Identifier: GPL-2.0+\n# Guillaume Valadon <gvaladon@quarkslab.com>\n\nimport ctypes\nimport os\nimport os.path"
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{
"path": "requirements.txt",
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"preview": "scapy @ git+https://github.com/secdev/scapy@master\ncryptography\npyroute2\n"
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{
"path": "setup.py",
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"preview": "# SPDX-License-Identifier: GPL-2.0+\n# Guillaume Valadon <gvaladon@quarkslab.com>\n\nfrom distutils.core import setup, Exte"
}
]
About this extraction
This page contains the full source code of the quarkslab/peetch GitHub repository, extracted and formatted as plain text for AI agents and large language models (LLMs). The extraction includes 15 files (70.2 KB), approximately 18.7k tokens, and a symbol index with 42 extracted functions, classes, methods, constants, and types. Use this with OpenClaw, Claude, ChatGPT, Cursor, Windsurf, or any other AI tool that accepts text input. You can copy the full output to your clipboard or download it as a .txt file.
Extracted by GitExtract — free GitHub repo to text converter for AI. Built by Nikandr Surkov.