forked from zaclys/searxng
148 lines
3.9 KiB
Python
148 lines
3.9 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
|
|
# lint: pylint
|
|
""".. _limiter src:
|
|
|
|
Limiter
|
|
=======
|
|
|
|
.. sidebar:: info
|
|
|
|
The limiter requires a :ref:`Redis <settings redis>` database.
|
|
|
|
Bot protection / IP rate limitation. The intention of rate limitation is to
|
|
limit suspicious requests from an IP. The motivation behind this is the fact
|
|
that SearXNG passes through requests from bots and is thus classified as a bot
|
|
itself. As a result, the SearXNG engine then receives a CAPTCHA or is blocked
|
|
by the search engine (the origin) in some other way.
|
|
|
|
To avoid blocking, the requests from bots to SearXNG must also be blocked, this
|
|
is the task of the limiter. To perform this task, the limiter uses the methods
|
|
from the :py:obj:`searx.botdetection`.
|
|
|
|
To enable the limiter activate:
|
|
|
|
.. code:: yaml
|
|
|
|
server:
|
|
...
|
|
limiter: true # rate limit the number of request on the instance, block some bots
|
|
|
|
and set the redis-url connection. Check the value, it depends on your redis DB
|
|
(see :ref:`settings redis`), by example:
|
|
|
|
.. code:: yaml
|
|
|
|
redis:
|
|
url: unix:///usr/local/searxng-redis/run/redis.sock?db=0
|
|
|
|
"""
|
|
|
|
from __future__ import annotations
|
|
|
|
from pathlib import Path
|
|
from ipaddress import ip_address
|
|
import flask
|
|
import werkzeug
|
|
|
|
from searx.tools import config
|
|
from searx import logger
|
|
|
|
from . import (
|
|
http_accept,
|
|
http_accept_encoding,
|
|
http_accept_language,
|
|
http_connection,
|
|
http_user_agent,
|
|
ip_limit,
|
|
ip_lists,
|
|
)
|
|
|
|
from ._helpers import (
|
|
get_network,
|
|
get_real_ip,
|
|
dump_request,
|
|
)
|
|
|
|
logger = logger.getChild('botdetection.limiter')
|
|
|
|
CFG: config.Config = None # type: ignore
|
|
|
|
LIMITER_CFG_SCHEMA = Path(__file__).parent / "limiter.toml"
|
|
"""Base configuration (schema) of the botdetection."""
|
|
|
|
LIMITER_CFG = Path('/etc/searxng/limiter.toml')
|
|
"""Local Limiter configuration."""
|
|
|
|
CFG_DEPRECATED = {
|
|
# "dummy.old.foo": "config 'dummy.old.foo' exists only for tests. Don't use it in your real project config."
|
|
}
|
|
|
|
|
|
def get_cfg() -> config.Config:
|
|
global CFG # pylint: disable=global-statement
|
|
if CFG is None:
|
|
CFG = config.Config.from_toml(LIMITER_CFG_SCHEMA, LIMITER_CFG, CFG_DEPRECATED)
|
|
return CFG
|
|
|
|
|
|
def filter_request(request: flask.Request) -> werkzeug.Response | None:
|
|
# pylint: disable=too-many-return-statements
|
|
|
|
cfg = get_cfg()
|
|
real_ip = ip_address(get_real_ip(request))
|
|
network = get_network(real_ip, cfg)
|
|
|
|
if request.path == '/healthz':
|
|
return None
|
|
|
|
# link-local
|
|
|
|
if network.is_link_local:
|
|
return None
|
|
|
|
# block- & pass- lists
|
|
#
|
|
# 1. The IP of the request is first checked against the pass-list; if the IP
|
|
# matches an entry in the list, the request is not blocked.
|
|
# 2. If no matching entry is found in the pass-list, then a check is made against
|
|
# the block list; if the IP matches an entry in the list, the request is
|
|
# blocked.
|
|
# 3. If the IP is not in either list, the request is not blocked.
|
|
|
|
match, msg = ip_lists.pass_ip(real_ip, cfg)
|
|
if match:
|
|
logger.warning("PASS %s: matched PASSLIST - %s", network.compressed, msg)
|
|
return None
|
|
|
|
match, msg = ip_lists.block_ip(real_ip, cfg)
|
|
if match:
|
|
logger.error("BLOCK %s: matched BLOCKLIST - %s", network.compressed, msg)
|
|
return flask.make_response(('IP is on BLOCKLIST - %s' % msg, 429))
|
|
|
|
# methods applied on /
|
|
|
|
for func in [
|
|
http_user_agent,
|
|
]:
|
|
val = func.filter_request(network, request, cfg)
|
|
if val is not None:
|
|
return val
|
|
|
|
# methods applied on /search
|
|
|
|
if request.path == '/search':
|
|
|
|
for func in [
|
|
http_accept,
|
|
http_accept_encoding,
|
|
http_accept_language,
|
|
http_connection,
|
|
http_user_agent,
|
|
ip_limit,
|
|
]:
|
|
val = func.filter_request(network, request, cfg)
|
|
if val is not None:
|
|
return val
|
|
logger.debug(f"OK {network}: %s", dump_request(flask.request))
|
|
return None
|