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  <h1>Source code for searx.limiter</h1><div class="highlight"><pre>
<span></span><span class="c1"># SPDX-License-Identifier: AGPL-3.0-or-later</span>
<span class="sd">&quot;&quot;&quot;Bot protection / IP rate limitation.  The intention of rate limitation is to</span>
<span class="sd">limit suspicious requests from an IP.  The motivation behind this is the fact</span>
<span class="sd">that SearXNG passes through requests from bots and is thus classified as a bot</span>
<span class="sd">itself.  As a result, the SearXNG engine then receives a CAPTCHA or is blocked</span>
<span class="sd">by the search engine (the origin) in some other way.</span>

<span class="sd">To avoid blocking, the requests from bots to SearXNG must also be blocked, this</span>
<span class="sd">is the task of the limiter.  To perform this task, the limiter uses the methods</span>
<span class="sd">from the :ref:`botdetection`:</span>

<span class="sd">- Analysis of the HTTP header in the request / :ref:`botdetection probe headers`</span>
<span class="sd">  can be easily bypassed.</span>

<span class="sd">- Block and pass lists in which IPs are listed / :ref:`botdetection ip_lists`</span>
<span class="sd">  are hard to maintain, since the IPs of bots are not all known and change over</span>
<span class="sd">  the time.</span>

<span class="sd">- Detection &amp; dynamically :ref:`botdetection rate limit` of bots based on the</span>
<span class="sd">  behavior of the requests.  For dynamically changeable IP lists a Redis</span>
<span class="sd">  database is needed.</span>

<span class="sd">The prerequisite for IP based methods is the correct determination of the IP of</span>
<span class="sd">the client. The IP of the client is determined via the X-Forwarded-For_ HTTP</span>
<span class="sd">header.</span>

<span class="sd">.. attention::</span>

<span class="sd">   A correct setup of the HTTP request headers ``X-Forwarded-For`` and</span>
<span class="sd">   ``X-Real-IP`` is essential to be able to assign a request to an IP correctly:</span>

<span class="sd">   - `NGINX RequestHeader`_</span>
<span class="sd">   - `Apache RequestHeader`_</span>

<span class="sd">.. _X-Forwarded-For:</span>
<span class="sd">    https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For</span>
<span class="sd">.. _NGINX RequestHeader:</span>
<span class="sd">    https://docs.searxng.org/admin/installation-nginx.html#nginx-s-searxng-site</span>
<span class="sd">.. _Apache RequestHeader:</span>
<span class="sd">    https://docs.searxng.org/admin/installation-apache.html#apache-s-searxng-site</span>

<span class="sd">Enable Limiter</span>
<span class="sd">==============</span>

<span class="sd">To enable the limiter activate:</span>

<span class="sd">.. code:: yaml</span>

<span class="sd">   server:</span>
<span class="sd">     ...</span>
<span class="sd">     limiter: true  # rate limit the number of request on the instance, block some bots</span>

<span class="sd">and set the redis-url connection. Check the value, it depends on your redis DB</span>
<span class="sd">(see :ref:`settings redis`), by example:</span>

<span class="sd">.. code:: yaml</span>

<span class="sd">   redis:</span>
<span class="sd">     url: unix:///usr/local/searxng-redis/run/redis.sock?db=0</span>


<span class="sd">Configure Limiter</span>
<span class="sd">=================</span>

<span class="sd">The methods of :ref:`botdetection` the limiter uses are configured in a local</span>
<span class="sd">file ``/etc/searxng/limiter.toml``.  The defaults are shown in limiter.toml_ /</span>
<span class="sd">Don&#39;t copy all values to your local configuration, just enable what you need by</span>
<span class="sd">overwriting the defaults.  For instance to activate the ``link_token`` method in</span>
<span class="sd">the :ref:`botdetection.ip_limit` you only need to set this option to ``true``:</span>

<span class="sd">.. code:: toml</span>

<span class="sd">   [botdetection.ip_limit]</span>
<span class="sd">   link_token = true</span>

<span class="sd">.. _limiter.toml:</span>

<span class="sd">``limiter.toml``</span>
<span class="sd">================</span>

<span class="sd">In this file the limiter finds the configuration of the :ref:`botdetection`:</span>

<span class="sd">- :ref:`botdetection ip_lists`</span>
<span class="sd">- :ref:`botdetection rate limit`</span>
<span class="sd">- :ref:`botdetection probe headers`</span>

<span class="sd">.. kernel-include:: $SOURCEDIR/limiter.toml</span>
<span class="sd">   :code: toml</span>

<span class="sd">Implementation</span>
<span class="sd">==============</span>

<span class="sd">&quot;&quot;&quot;</span>

<span class="kn">from</span><span class="w"> </span><span class="nn">__future__</span><span class="w"> </span><span class="kn">import</span> <span class="n">annotations</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">sys</span>

<span class="kn">from</span><span class="w"> </span><span class="nn">pathlib</span><span class="w"> </span><span class="kn">import</span> <span class="n">Path</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">ipaddress</span><span class="w"> </span><span class="kn">import</span> <span class="n">ip_address</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">flask</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">werkzeug</span>

<span class="kn">from</span><span class="w"> </span><span class="nn">searx</span><span class="w"> </span><span class="kn">import</span> <span class="p">(</span>
    <span class="n">logger</span><span class="p">,</span>
    <span class="n">redisdb</span><span class="p">,</span>
<span class="p">)</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">searx</span><span class="w"> </span><span class="kn">import</span> <span class="n">botdetection</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">searx.extended_types</span><span class="w"> </span><span class="kn">import</span> <span class="n">SXNG_Request</span><span class="p">,</span> <span class="n">sxng_request</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">searx.botdetection</span><span class="w"> </span><span class="kn">import</span> <span class="p">(</span>
    <span class="n">config</span><span class="p">,</span>
    <span class="n">http_accept</span><span class="p">,</span>
    <span class="n">http_accept_encoding</span><span class="p">,</span>
    <span class="n">http_accept_language</span><span class="p">,</span>
    <span class="n">http_user_agent</span><span class="p">,</span>
    <span class="n">ip_limit</span><span class="p">,</span>
    <span class="n">ip_lists</span><span class="p">,</span>
    <span class="n">get_network</span><span class="p">,</span>
    <span class="n">get_real_ip</span><span class="p">,</span>
    <span class="n">dump_request</span><span class="p">,</span>
<span class="p">)</span>

<span class="c1"># the configuration are limiter.toml and &quot;limiter&quot; in settings.yml so, for</span>
<span class="c1"># coherency, the logger is &quot;limiter&quot;</span>
<span class="n">logger</span> <span class="o">=</span> <span class="n">logger</span><span class="o">.</span><span class="n">getChild</span><span class="p">(</span><span class="s1">&#39;limiter&#39;</span><span class="p">)</span>

<span class="n">CFG</span><span class="p">:</span> <span class="n">config</span><span class="o">.</span><span class="n">Config</span> <span class="o">=</span> <span class="kc">None</span>  <span class="c1"># type: ignore</span>
<span class="n">_INSTALLED</span> <span class="o">=</span> <span class="kc">False</span>

<span class="n">LIMITER_CFG_SCHEMA</span> <span class="o">=</span> <span class="n">Path</span><span class="p">(</span><span class="vm">__file__</span><span class="p">)</span><span class="o">.</span><span class="n">parent</span> <span class="o">/</span> <span class="s2">&quot;limiter.toml&quot;</span>
<span class="sd">&quot;&quot;&quot;Base configuration (schema) of the botdetection.&quot;&quot;&quot;</span>

<span class="n">CFG_DEPRECATED</span> <span class="o">=</span> <span class="p">{</span>
    <span class="c1"># &quot;dummy.old.foo&quot;: &quot;config &#39;dummy.old.foo&#39; exists only for tests.  Don&#39;t use it in your real project config.&quot;</span>
<span class="p">}</span>


<span class="k">def</span><span class="w"> </span><span class="nf">get_cfg</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="n">config</span><span class="o">.</span><span class="n">Config</span><span class="p">:</span>
    <span class="k">global</span> <span class="n">CFG</span>  <span class="c1"># pylint: disable=global-statement</span>

    <span class="k">if</span> <span class="n">CFG</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="kn">from</span><span class="w"> </span><span class="nn">.</span><span class="w"> </span><span class="kn">import</span> <span class="n">settings_loader</span>  <span class="c1"># pylint: disable=import-outside-toplevel</span>

        <span class="n">cfg_file</span> <span class="o">=</span> <span class="p">(</span><span class="n">settings_loader</span><span class="o">.</span><span class="n">get_user_cfg_folder</span><span class="p">()</span> <span class="ow">or</span> <span class="n">Path</span><span class="p">(</span><span class="s2">&quot;/etc/searxng&quot;</span><span class="p">))</span> <span class="o">/</span> <span class="s2">&quot;limiter.toml&quot;</span>
        <span class="n">CFG</span> <span class="o">=</span> <span class="n">config</span><span class="o">.</span><span class="n">Config</span><span class="o">.</span><span class="n">from_toml</span><span class="p">(</span><span class="n">LIMITER_CFG_SCHEMA</span><span class="p">,</span> <span class="n">cfg_file</span><span class="p">,</span> <span class="n">CFG_DEPRECATED</span><span class="p">)</span>
    <span class="k">return</span> <span class="n">CFG</span>


<span class="k">def</span><span class="w"> </span><span class="nf">filter_request</span><span class="p">(</span><span class="n">request</span><span class="p">:</span> <span class="n">SXNG_Request</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">werkzeug</span><span class="o">.</span><span class="n">Response</span> <span class="o">|</span> <span class="kc">None</span><span class="p">:</span>
    <span class="c1"># pylint: disable=too-many-return-statements</span>

    <span class="n">cfg</span> <span class="o">=</span> <span class="n">get_cfg</span><span class="p">()</span>
    <span class="n">real_ip</span> <span class="o">=</span> <span class="n">ip_address</span><span class="p">(</span><span class="n">get_real_ip</span><span class="p">(</span><span class="n">request</span><span class="p">))</span>
    <span class="n">network</span> <span class="o">=</span> <span class="n">get_network</span><span class="p">(</span><span class="n">real_ip</span><span class="p">,</span> <span class="n">cfg</span><span class="p">)</span>

    <span class="k">if</span> <span class="n">request</span><span class="o">.</span><span class="n">path</span> <span class="o">==</span> <span class="s1">&#39;/healthz&#39;</span><span class="p">:</span>
        <span class="k">return</span> <span class="kc">None</span>

    <span class="c1"># link-local</span>

    <span class="k">if</span> <span class="n">network</span><span class="o">.</span><span class="n">is_link_local</span><span class="p">:</span>
        <span class="k">return</span> <span class="kc">None</span>

    <span class="c1"># block- &amp; pass- lists</span>
    <span class="c1">#</span>
    <span class="c1"># 1. The IP of the request is first checked against the pass-list; if the IP</span>
    <span class="c1">#    matches an entry in the list, the request is not blocked.</span>
    <span class="c1"># 2. If no matching entry is found in the pass-list, then a check is made against</span>
    <span class="c1">#    the block list; if the IP matches an entry in the list, the request is</span>
    <span class="c1">#    blocked.</span>
    <span class="c1"># 3. If the IP is not in either list, the request is not blocked.</span>

    <span class="n">match</span><span class="p">,</span> <span class="n">msg</span> <span class="o">=</span> <span class="n">ip_lists</span><span class="o">.</span><span class="n">pass_ip</span><span class="p">(</span><span class="n">real_ip</span><span class="p">,</span> <span class="n">cfg</span><span class="p">)</span>
    <span class="k">if</span> <span class="n">match</span><span class="p">:</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span><span class="s2">&quot;PASS </span><span class="si">%s</span><span class="s2">: matched PASSLIST - </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">network</span><span class="o">.</span><span class="n">compressed</span><span class="p">,</span> <span class="n">msg</span><span class="p">)</span>
        <span class="k">return</span> <span class="kc">None</span>

    <span class="n">match</span><span class="p">,</span> <span class="n">msg</span> <span class="o">=</span> <span class="n">ip_lists</span><span class="o">.</span><span class="n">block_ip</span><span class="p">(</span><span class="n">real_ip</span><span class="p">,</span> <span class="n">cfg</span><span class="p">)</span>
    <span class="k">if</span> <span class="n">match</span><span class="p">:</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">&quot;BLOCK </span><span class="si">%s</span><span class="s2">: matched BLOCKLIST - </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">network</span><span class="o">.</span><span class="n">compressed</span><span class="p">,</span> <span class="n">msg</span><span class="p">)</span>
        <span class="k">return</span> <span class="n">flask</span><span class="o">.</span><span class="n">make_response</span><span class="p">((</span><span class="s1">&#39;IP is on BLOCKLIST - </span><span class="si">%s</span><span class="s1">&#39;</span> <span class="o">%</span> <span class="n">msg</span><span class="p">,</span> <span class="mi">429</span><span class="p">))</span>

    <span class="c1"># methods applied on /</span>

    <span class="k">for</span> <span class="n">func</span> <span class="ow">in</span> <span class="p">[</span>
        <span class="n">http_user_agent</span><span class="p">,</span>
    <span class="p">]:</span>
        <span class="n">val</span> <span class="o">=</span> <span class="n">func</span><span class="o">.</span><span class="n">filter_request</span><span class="p">(</span><span class="n">network</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">cfg</span><span class="p">)</span>
        <span class="k">if</span> <span class="n">val</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
            <span class="k">return</span> <span class="n">val</span>

    <span class="c1"># methods applied on /search</span>

    <span class="k">if</span> <span class="n">request</span><span class="o">.</span><span class="n">path</span> <span class="o">==</span> <span class="s1">&#39;/search&#39;</span><span class="p">:</span>

        <span class="k">for</span> <span class="n">func</span> <span class="ow">in</span> <span class="p">[</span>
            <span class="n">http_accept</span><span class="p">,</span>
            <span class="n">http_accept_encoding</span><span class="p">,</span>
            <span class="n">http_accept_language</span><span class="p">,</span>
            <span class="n">http_user_agent</span><span class="p">,</span>
            <span class="n">ip_limit</span><span class="p">,</span>
        <span class="p">]:</span>
            <span class="n">val</span> <span class="o">=</span> <span class="n">func</span><span class="o">.</span><span class="n">filter_request</span><span class="p">(</span><span class="n">network</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">cfg</span><span class="p">)</span>
            <span class="k">if</span> <span class="n">val</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
                <span class="k">return</span> <span class="n">val</span>
    <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;OK </span><span class="si">{</span><span class="n">network</span><span class="si">}</span><span class="s2">: %s&quot;</span><span class="p">,</span> <span class="n">dump_request</span><span class="p">(</span><span class="n">sxng_request</span><span class="p">))</span>
    <span class="k">return</span> <span class="kc">None</span>


<div class="viewcode-block" id="pre_request">
<a class="viewcode-back" href="../../admin/searx.limiter.html#searx.limiter.pre_request">[docs]</a>
<span class="k">def</span><span class="w"> </span><span class="nf">pre_request</span><span class="p">():</span>
<span class="w">    </span><span class="sd">&quot;&quot;&quot;See :py:obj:`flask.Flask.before_request`&quot;&quot;&quot;</span>
    <span class="k">return</span> <span class="n">filter_request</span><span class="p">(</span><span class="n">sxng_request</span><span class="p">)</span></div>


<div class="viewcode-block" id="is_installed">
<a class="viewcode-back" href="../../admin/searx.limiter.html#searx.limiter.is_installed">[docs]</a>
<span class="k">def</span><span class="w"> </span><span class="nf">is_installed</span><span class="p">():</span>
<span class="w">    </span><span class="sd">&quot;&quot;&quot;Returns ``True`` if limiter is active and a redis DB is available.&quot;&quot;&quot;</span>
    <span class="k">return</span> <span class="n">_INSTALLED</span></div>


<div class="viewcode-block" id="initialize">
<a class="viewcode-back" href="../../admin/searx.limiter.html#searx.limiter.initialize">[docs]</a>
<span class="k">def</span><span class="w"> </span><span class="nf">initialize</span><span class="p">(</span><span class="n">app</span><span class="p">:</span> <span class="n">flask</span><span class="o">.</span><span class="n">Flask</span><span class="p">,</span> <span class="n">settings</span><span class="p">):</span>
<span class="w">    </span><span class="sd">&quot;&quot;&quot;Install the limiter&quot;&quot;&quot;</span>
    <span class="k">global</span> <span class="n">_INSTALLED</span>  <span class="c1"># pylint: disable=global-statement</span>

    <span class="c1"># even if the limiter is not activated, the botdetection must be activated</span>
    <span class="c1"># (e.g. the self_info plugin uses the botdetection to get client IP)</span>

    <span class="n">cfg</span> <span class="o">=</span> <span class="n">get_cfg</span><span class="p">()</span>
    <span class="n">redis_client</span> <span class="o">=</span> <span class="n">redisdb</span><span class="o">.</span><span class="n">client</span><span class="p">()</span>
    <span class="n">botdetection</span><span class="o">.</span><span class="n">init</span><span class="p">(</span><span class="n">cfg</span><span class="p">,</span> <span class="n">redis_client</span><span class="p">)</span>

    <span class="k">if</span> <span class="ow">not</span> <span class="p">(</span><span class="n">settings</span><span class="p">[</span><span class="s1">&#39;server&#39;</span><span class="p">][</span><span class="s1">&#39;limiter&#39;</span><span class="p">]</span> <span class="ow">or</span> <span class="n">settings</span><span class="p">[</span><span class="s1">&#39;server&#39;</span><span class="p">][</span><span class="s1">&#39;public_instance&#39;</span><span class="p">]):</span>
        <span class="k">return</span>

    <span class="k">if</span> <span class="ow">not</span> <span class="n">redis_client</span><span class="p">:</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span>
            <span class="s2">&quot;The limiter requires Redis, please consult the documentation: &quot;</span>
            <span class="s2">&quot;https://docs.searxng.org/admin/searx.limiter.html&quot;</span>
        <span class="p">)</span>
        <span class="k">if</span> <span class="n">settings</span><span class="p">[</span><span class="s1">&#39;server&#39;</span><span class="p">][</span><span class="s1">&#39;public_instance&#39;</span><span class="p">]:</span>
            <span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
        <span class="k">return</span>

    <span class="n">_INSTALLED</span> <span class="o">=</span> <span class="kc">True</span>

    <span class="k">if</span> <span class="n">settings</span><span class="p">[</span><span class="s1">&#39;server&#39;</span><span class="p">][</span><span class="s1">&#39;public_instance&#39;</span><span class="p">]:</span>
        <span class="c1"># overwrite limiter.toml setting</span>
        <span class="n">cfg</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s1">&#39;botdetection.ip_limit.link_token&#39;</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>

    <span class="n">app</span><span class="o">.</span><span class="n">before_request</span><span class="p">(</span><span class="n">pre_request</span><span class="p">)</span></div>

</pre></div>

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