mirror of https://github.com/searxng/searxng.git
103 lines
3.6 KiB
Python
103 lines
3.6 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
|
|
# lint: pylint
|
|
# pyright: basic
|
|
"""Some bot protection / rate limitation
|
|
|
|
To monitor rate limits and protect privacy the IP addresses are getting stored
|
|
with a hash so the limiter plugin knows who to block. A redis database is
|
|
needed to store the hash values.
|
|
|
|
Enable the plugin in ``settings.yml``:
|
|
|
|
- ``server.limiter: true``
|
|
- ``redis.url: ...`` check the value, see :ref:`settings redis`
|
|
"""
|
|
|
|
import re
|
|
from flask import request
|
|
|
|
from searx.shared import redisdb
|
|
from searx.redislib import incr_sliding_window
|
|
|
|
name = "Request limiter"
|
|
description = "Limit the number of request"
|
|
default_on = False
|
|
preference_section = 'service'
|
|
|
|
|
|
re_bot = re.compile(
|
|
r'('
|
|
+ r'[Cc][Uu][Rr][Ll]|[wW]get|Scrapy|splash|JavaFX|FeedFetcher|python-requests|Go-http-client|Java|Jakarta|okhttp'
|
|
+ r'|HttpClient|Jersey|Python|libwww-perl|Ruby|SynHttpClient|UniversalFeedParser|Googlebot|GoogleImageProxy'
|
|
+ r'|bingbot|Baiduspider|yacybot|YandexMobileBot|YandexBot|Yahoo! Slurp|MJ12bot|AhrefsBot|archive.org_bot|msnbot'
|
|
+ r'|MJ12bot|SeznamBot|linkdexbot|Netvibes|SMTBot|zgrab|James BOT|Sogou|Abonti|Pixray|Spinn3r|SemrushBot|Exabot'
|
|
+ r'|ZmEu|BLEXBot|bitlybot'
|
|
+ r')'
|
|
)
|
|
|
|
|
|
def is_accepted_request() -> bool:
|
|
# pylint: disable=too-many-return-statements
|
|
redis_client = redisdb.client()
|
|
user_agent = request.headers.get('User-Agent', '')
|
|
x_forwarded_for = request.headers.get('X-Forwarded-For', '')
|
|
|
|
if request.path == '/image_proxy':
|
|
if re_bot.match(user_agent):
|
|
return False
|
|
return True
|
|
|
|
if request.path == '/search':
|
|
c_burst = incr_sliding_window(redis_client, 'IP limit, burst' + x_forwarded_for, 20)
|
|
c_10min = incr_sliding_window(redis_client, 'IP limit, 10 minutes' + x_forwarded_for, 600)
|
|
if c_burst > 15 or c_10min > 150:
|
|
logger.debug("to many request") # pylint: disable=undefined-variable
|
|
return False
|
|
|
|
if re_bot.match(user_agent):
|
|
logger.debug("detected bot") # pylint: disable=undefined-variable
|
|
return False
|
|
|
|
if len(request.headers.get('Accept-Language', '').strip()) == '':
|
|
logger.debug("missing Accept-Language") # pylint: disable=undefined-variable
|
|
return False
|
|
|
|
if request.headers.get('Connection') == 'close':
|
|
logger.debug("got Connection=close") # pylint: disable=undefined-variable
|
|
return False
|
|
|
|
accept_encoding_list = [l.strip() for l in request.headers.get('Accept-Encoding', '').split(',')]
|
|
if 'gzip' not in accept_encoding_list or 'deflate' not in accept_encoding_list:
|
|
logger.debug("suspicious Accept-Encoding") # pylint: disable=undefined-variable
|
|
return False
|
|
|
|
if 'text/html' not in request.accept_mimetypes:
|
|
logger.debug("Accept-Encoding misses text/html") # pylint: disable=undefined-variable
|
|
return False
|
|
|
|
if request.args.get('format', 'html') != 'html':
|
|
c = incr_sliding_window(redis_client, 'API limit' + x_forwarded_for, 3600)
|
|
if c > 4:
|
|
logger.debug("API limit exceeded") # pylint: disable=undefined-variable
|
|
return False
|
|
return True
|
|
|
|
|
|
def pre_request():
|
|
if not is_accepted_request():
|
|
return 'Too Many Requests', 429
|
|
return None
|
|
|
|
|
|
def init(app, settings):
|
|
if not settings['server']['limiter']:
|
|
return False
|
|
|
|
logger.debug("init limiter DB") # pylint: disable=undefined-variable
|
|
if not redisdb.init():
|
|
logger.error("init limiter DB failed!!!") # pylint: disable=undefined-variable
|
|
return False
|
|
|
|
app.before_request(pre_request)
|
|
return True
|