mirrors/searxng
1
0
Fork 0
mirror of https://github.com/searxng/searxng.git synced 2024-11-25 20:31:00 +00:00
Code Issues Projects Releases Wiki Activity

Merge pull request #2266 from return42/shuffle-cipher

Browse source 
[mod] Shuffle httpx's default ciphers of a SSL context randomly.
This commit is contained in:
Markus Heiser 2023-03-20 12:28:05 +01:00 committed by GitHub
commit b61b845951
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 25 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
searx/network/client.py
View file

@ -4,6 +4,7 @@
import asyncio
import logging
import random
from ssl import SSLContext
import threading
from typing import Any, Dict
@ -28,10 +29,34 @@ LOOP = None
SSLCONTEXTS: Dict[Any, SSLContext] = {}
def shuffle_ciphers(ssl_context):
"""Shuffle httpx's default ciphers of a SSL context randomly.
From `What Is TLS Fingerprint and How to Bypass It`_
> When implementing TLS fingerprinting, servers can't operate based on a
> locked-in whitelist database of fingerprints. New fingerprints appear
> when web clients or TLS libraries release new versions. So, they have to
> live off a blocklist database instead.
> ...
> It's safe to leave the first three as is but shuffle the remaining ciphers
> and you can bypass the TLS fingerprint check.
.. _What Is TLS Fingerprint and How to Bypass It:
https://www.zenrows.com/blog/what-is-tls-fingerprint#how-to-bypass-tls-fingerprinting
"""
c_list = httpx._config.DEFAULT_CIPHERS.split(':') # pylint: disable=protected-access
sc_list, c_list = c_list[:3], c_list[3:]
random.shuffle(c_list)
ssl_context.set_ciphers(":".join(sc_list + c_list))
def get_sslcontexts(proxy_url=None, cert=None, verify=True, trust_env=True, http2=False):
key = (proxy_url, cert, verify, trust_env, http2)
if key not in SSLCONTEXTS:
SSLCONTEXTS[key] = httpx.create_ssl_context(cert, verify, trust_env, http2)
shuffle_ciphers(SSLCONTEXTS[key])
return SSLCONTEXTS[key]