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[fix] py: (un)trusted proxies (#6556)

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A missing condition allowed an attacker to mask their IP address from the
server. This exploit can only be carried under specific client & server
environments.

Reported-by: Raffaele Forte <raffaele@backbox.org>
Signed-off-by: Ivan Gabaldon <igabaldon@inetol.net>
This commit is contained in:
Ivan Gabaldon
2026-08-20 18:06:24 +02:00
committed by GitHub
parent 8d3dd0cd45
commit 487d7a96e0
1 changed files with 29 additions and 19 deletions
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44
searx/botdetection/trusted_proxies.py
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@@ -63,6 +63,20 @@ class ProxyFix:
proxy_list: list[str] = cfg.get("botdetection.trusted_proxies", default=[]) proxy_list: list[str] = cfg.get("botdetection.trusted_proxies", default=[])
return [ip_network(net, strict=False) for net in proxy_list] return [ip_network(net, strict=False) for net in proxy_list]
def is_trusted_proxy(
self,
addr: IPv4Address | IPv6Address | None,
trusted_proxies: list[IPv4Network | IPv6Network],
) -> bool:
if addr is None:
return False
for net in trusted_proxies:
if addr.version == net.version and addr in net:
return True
return False
def trusted_remote_addr( def trusted_remote_addr(
self, self,
x_forwarded_for: list[IPv4Address | IPv6Address], x_forwarded_for: list[IPv4Address | IPv6Address],
@@ -70,16 +84,8 @@ class ProxyFix:
) -> str: ) -> str:
# always rtl # always rtl
for addr in reversed(x_forwarded_for): for addr in reversed(x_forwarded_for):
trust: bool = False if not self.is_trusted_proxy(addr, trusted_proxies):
logger.debug("client address from X-Forwarded-For: %s", addr)
for net in trusted_proxies:
if addr.version == net.version and addr in net:
logger.debug("trust proxy %s (member of %s)", addr, net)
trust = True
break
# client address
if not trust:
return addr.compressed return addr.compressed
# fallback to first address # fallback to first address
@@ -95,19 +101,21 @@ class ProxyFix:
# in this function! # in this function!
orig_remote_addr: str | None = environ.pop("REMOTE_ADDR") orig_remote_addr: str | None = environ.pop("REMOTE_ADDR")
orig_remote_ip: IPv4Address | IPv6Address | None = None
# Validate the IPs involved in this game and delete all invalid ones # Validate the IPs involved in this game and delete all invalid ones
# from the WSGI environment. # from the WSGI environment.
if orig_remote_addr: if orig_remote_addr:
try: try:
addr = ip_address(orig_remote_addr) orig_remote_ip = ip_address(orig_remote_addr)
if addr.version == 6 and addr.ipv4_mapped: if orig_remote_ip.version == 6 and orig_remote_ip.ipv4_mapped:
addr = addr.ipv4_mapped orig_remote_ip = orig_remote_ip.ipv4_mapped
orig_remote_addr = addr.compressed orig_remote_addr = orig_remote_ip.compressed
except ValueError as exc: except ValueError as exc:
logger.error("REMOTE_ADDR: %s / discard REMOTE_ADDR from WSGI environment", exc) logger.error("REMOTE_ADDR: %s / discard REMOTE_ADDR from WSGI environment", exc)
orig_remote_addr = None orig_remote_addr = None
orig_remote_ip = None
x_real_ip: str | None = environ.get("HTTP_X_REAL_IP") x_real_ip: str | None = environ.get("HTTP_X_REAL_IP")
if x_real_ip: if x_real_ip:
@@ -141,11 +149,13 @@ class ProxyFix:
if not x_forwarded_for and not x_real_ip: if not x_forwarded_for and not x_real_ip:
log_error_only_once("X-Forwarded-For nor X-Real-IP header is set!") log_error_only_once("X-Forwarded-For nor X-Real-IP header is set!")
if x_forwarded_for and not trusted_proxies: if x_forwarded_for or x_real_ip:
if not trusted_proxies:
log_error_only_once("missing botdetection.trusted_proxies config") log_error_only_once("missing botdetection.trusted_proxies config")
# without trusted_proxies, this variable is useless for determining
# the real IP if not self.is_trusted_proxy(orig_remote_ip, trusted_proxies):
x_forwarded_for = [] x_forwarded_for = []
x_real_ip = None
# securing the WSGI environment variables that are adjusted # securing the WSGI environment variables that are adjusted