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9 commits

Author SHA1 Message Date
Markus Heiser
f3763d73ad [mod] limiter: blocklist and passlist (ip_lists)
A blocklist and a passlist can be configured in /etc/searxng/limiter.toml::

    [botdetection.ip_lists]
    pass_ip = [
      '51.15.252.168',  # IPv4 of check.searx.space
    ]

    block_ip = [
      '93.184.216.34',  # IPv4 of example.org
    ]

Closes: https://github.com/searxng/searxng/issues/2127
Closes: https://github.com/searxng/searxng/pull/2129
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
2023-06-05 14:07:19 +02:00
Markus Heiser
80af38d37b [mod] increase SUSPICIOUS_IP_WINDOW from one day to 30 days
In my tests I see bots rotating IPs (with endless IP lists).  If such a bot has
100 IPs and has three attempts (SUSPICIOUS_IP_MAX = 3) then it can successfully
send up to 300 requests in one day while rotating the IP.  To block the bots for
a longer period of time the SUSPICIOUS_IP_WINDOW, as the time period in which an
IP is observed, must be increased.

For normal WEB-browsers this is no problem, because the SUSPICIOUS_IP_WINDOW is
deleted as soon as the CSS with the token is loaded.

SUSPICIOUS_IP_WINDOW = 3600 * 24 * 30
  Time (sec) before sliding window for one suspicious IP expires.

SUSPICIOUS_IP_MAX = 3
  Maximum requests from one suspicious IP in the :py:obj:`SUSPICIOUS_IP_WINDOW`."""

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
2023-06-01 16:00:49 +02:00
Markus Heiser
281e36f4b7 [fix] limiter: replace real_ip by IPv4/v6 network
Closes: https://github.com/searxng/searxng/issues/2477
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
2023-06-01 15:51:14 +02:00
Markus Heiser
38431d2e14 [fix] correct determination of the IP for the request
For correct determination of the IP to the request the function
botdetection.get_real_ip() is implemented.  This fonction is used in the
ip_limit and link_token method of the botdetection and it is used in the
self_info plugin.

A documentation about the X-Forwarded-For header has been added.

[1] https://github.com/searxng/searxng/pull/2357#issuecomment-1566211059

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
2023-06-01 14:38:53 +02:00
Markus Heiser
b8c7c2c9aa [mod] botdetection - improve ip_limit and link_token methods
- counting requests in LONG_WINDOW and BURST_WINDOW is not needed when the
  request is validated by the link_token method [1]

- renew a ping-key on validation [2], this is needed for infinite scrolling,
  where no new token (CSS) is loaded. / this does not fix the BURST_MAX issue in
  the vanilla limiter

- normalize the counter names of the ip_limit method to 'ip_limit.*'

- just integrate the ip_limit method straight forward in the limiter plugin /
  non intermediate code --> ip_limit now returns None or a werkzeug.Response
  object that can be passed by the plugin to the flask application / non
  intermediate code that returns a tuple

[1] https://github.com/searxng/searxng/pull/2357#issuecomment-1566113277
[2] https://github.com/searxng/searxng/pull/2357#discussion_r1208542206
[3] https://github.com/searxng/searxng/pull/2357#issuecomment-1566125979

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
2023-06-01 14:38:53 +02:00
Markus Heiser
52f1452c09 [mod] limiter: ip_limt - monitore suspicious IPs
To intercept bots that get their IPs from a range of IPs, there is a
``SUSPICIOUS_IP_WINDOW``.  In this window the suspicious IPs are stored for a
longer time.  IPs stored in this sliding window have a maximum of
``SUSPICIOUS_IP_MAX`` accesses before they are blocked.  As soon as the IP makes
a request that is not suspicious, the sliding window for this IP is droped.

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
2023-06-01 14:38:53 +02:00
Markus Heiser
9d7456fd6c [fix] limiter.toml: botdetection.ip_limit turn off link_token by default
To activate the ``link_token`` method in the ``ip_limit`` method add the
following to your ``/etc/searxng/limiter.toml``::

   [botdetection.ip_limit]
   link_token = true

Related: https://github.com/searxng/searxng/pull/2357#issuecomment-1554116941
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
2023-06-01 14:38:53 +02:00
Markus Heiser
66fdec0eb9 [mod] limiter: add config file /etc/searxng/limiter.toml
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
2023-06-01 14:38:53 +02:00
Markus Heiser
1ec325adcc [mod] limiter -> botdetection: modularization and documentation
In order to be able to meet the outstanding requirements, the implementation is
modularized and supplemented with documentation.

This patch does not contain functional change, except it fixes issue #2455

----

Aktivate limiter in the settings.yml and simulate a bot request by::

    curl -H 'Accept-Language: de-DE,en-US;q=0.7,en;q=0.3' \
         -H 'Accept: text/html'
         -H 'User-Agent: xyz' \
         -H 'Accept-Encoding: gzip' \
         'http://127.0.0.1:8888/search?q=foo'

In the LOG:

    DEBUG   searx.botdetection.link_token : missing ping for this request: .....

Since ``BURST_MAX_SUSPICIOUS = 2`` you can repeat the query above two time
before you get a "Too Many Requests" response.

Closes: https://github.com/searxng/searxng/issues/2455
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
2023-05-29 14:54:56 +02:00