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diff --git a/_modules/searx/botdetection/link_token.html b/_modules/searx/botdetection/link_token.html new file mode 100644 index 000000000..6787a2646 --- /dev/null +++ b/_modules/searx/botdetection/link_token.html @@ -0,0 +1,274 @@ +<!DOCTYPE html> + +<html lang="en" data-content_root="../../../"> + <head> + <meta charset="utf-8" /> + <meta name="viewport" content="width=device-width, initial-scale=1.0" /> + <meta name="viewport" content="width=device-width, initial-scale=1"> + <title>searx.botdetection.link_token — SearXNG Documentation (2024.5.31+18fb701be)</title> + <link rel="stylesheet" type="text/css" href="../../../_static/pygments.css?v=4f649999" /> + <link rel="stylesheet" type="text/css" href="../../../_static/searxng.css?v=52e4ff28" /> + <link rel="stylesheet" type="text/css" href="../../../_static/tabs.css?v=a5c4661c" /> + <script src="../../../_static/documentation_options.js?v=e50dfc46"></script> + <script src="../../../_static/doctools.js?v=9a2dae69"></script> + <script src="../../../_static/sphinx_highlight.js?v=dc90522c"></script> + <script src="../../../_static/tabs.js?v=3030b3cb"></script> + <link rel="index" title="Index" href="../../../genindex.html" /> + <link rel="search" title="Search" href="../../../search.html" /> + </head><body> + <div class="related" role="navigation" aria-label="related navigation"> + <h3>Navigation</h3> + <ul> + <li class="right" style="margin-right: 10px"> + <a href="../../../genindex.html" title="General Index" + accesskey="I">index</a></li> + <li class="right" > + <a href="../../../py-modindex.html" title="Python Module Index" + >modules</a> |</li> + <li class="nav-item nav-item-0"><a href="../../../index.html">SearXNG Documentation (2024.5.31+18fb701be)</a> »</li> + <li class="nav-item nav-item-1"><a href="../../index.html" accesskey="U">Module code</a> »</li> + <li class="nav-item nav-item-this"><a href="">searx.botdetection.link_token</a></li> + </ul> + </div> + + <div class="document"> + <div class="documentwrapper"> + <div class="bodywrapper"> + <div class="body" role="main"> + + <h1>Source code for searx.botdetection.link_token</h1><div class="highlight"><pre> +<span></span><span class="c1"># SPDX-License-Identifier: AGPL-3.0-or-later</span> +<span class="sd">"""</span> +<span class="sd">Method ``link_token``</span> +<span class="sd">---------------------</span> + +<span class="sd">The ``link_token`` method evaluates a request as :py:obj:`suspicious</span> +<span class="sd"><is_suspicious>` if the URL ``/client<token>.css`` is not requested by the</span> +<span class="sd">client. By adding a random component (the token) in the URL, a bot can not send</span> +<span class="sd">a ping by request a static URL.</span> + +<span class="sd">.. note::</span> + +<span class="sd"> This method requires a redis DB and needs a HTTP X-Forwarded-For_ header.</span> + +<span class="sd">To get in use of this method a flask URL route needs to be added:</span> + +<span class="sd">.. code:: python</span> + +<span class="sd"> @app.route('/client<token>.css', methods=['GET', 'POST'])</span> +<span class="sd"> def client_token(token=None):</span> +<span class="sd"> link_token.ping(request, token)</span> +<span class="sd"> return Response('', mimetype='text/css')</span> + +<span class="sd">And in the HTML template from flask a stylesheet link is needed (the value of</span> +<span class="sd">``link_token`` comes from :py:obj:`get_token`):</span> + +<span class="sd">.. code:: html</span> + +<span class="sd"> <link rel="stylesheet"</span> +<span class="sd"> href="{{ url_for('client_token', token=link_token) }}"</span> +<span class="sd"> type="text/css" /></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">"""</span> +<span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">annotations</span> +<span class="kn">from</span> <span class="nn">ipaddress</span> <span class="kn">import</span> <span class="p">(</span> + <span class="n">IPv4Network</span><span class="p">,</span> + <span class="n">IPv6Network</span><span class="p">,</span> + <span class="n">ip_address</span><span class="p">,</span> +<span class="p">)</span> + +<span class="kn">import</span> <span class="nn">string</span> +<span class="kn">import</span> <span class="nn">random</span> +<span class="kn">import</span> <span class="nn">flask</span> + +<span class="kn">from</span> <span class="nn">searx</span> <span class="kn">import</span> <span class="n">logger</span> +<span class="kn">from</span> <span class="nn">searx</span> <span class="kn">import</span> <span class="n">redisdb</span> +<span class="kn">from</span> <span class="nn">searx.redislib</span> <span class="kn">import</span> <span class="n">secret_hash</span> + +<span class="kn">from</span> <span class="nn">._helpers</span> <span class="kn">import</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="p">)</span> + +<span class="n">TOKEN_LIVE_TIME</span> <span class="o">=</span> <span class="mi">600</span> +<span class="sd">"""Livetime (sec) of limiter's CSS token."""</span> + +<span class="n">PING_LIVE_TIME</span> <span class="o">=</span> <span class="mi">3600</span> +<span class="sd">"""Livetime (sec) of the ping-key from a client (request)"""</span> + +<span class="n">PING_KEY</span> <span class="o">=</span> <span class="s1">'SearXNG_limiter.ping'</span> +<span class="sd">"""Prefix of all ping-keys generated by :py:obj:`get_ping_key`"""</span> + +<span class="n">TOKEN_KEY</span> <span class="o">=</span> <span class="s1">'SearXNG_limiter.token'</span> +<span class="sd">"""Key for which the current token is stored in the DB"""</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">'botdetection.link_token'</span><span class="p">)</span> + + +<div class="viewcode-block" id="is_suspicious"> +<a class="viewcode-back" href="../../../src/searx.botdetection.html#searx.botdetection.link_token.is_suspicious">[docs]</a> +<span class="k">def</span> <span class="nf">is_suspicious</span><span class="p">(</span><span class="n">network</span><span class="p">:</span> <span class="n">IPv4Network</span> <span class="o">|</span> <span class="n">IPv6Network</span><span class="p">,</span> <span class="n">request</span><span class="p">:</span> <span class="n">flask</span><span class="o">.</span><span class="n">Request</span><span class="p">,</span> <span class="n">renew</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">):</span> +<span class="w"> </span><span class="sd">"""Checks whether a valid ping is exists for this (client) network, if not</span> +<span class="sd"> this request is rated as *suspicious*. If a valid ping exists and argument</span> +<span class="sd"> ``renew`` is ``True`` the expire time of this ping is reset to</span> +<span class="sd"> :py:obj:`PING_LIVE_TIME`.</span> + +<span class="sd"> """</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="k">if</span> <span class="ow">not</span> <span class="n">redis_client</span><span class="p">:</span> + <span class="k">return</span> <span class="kc">False</span> + + <span class="n">ping_key</span> <span class="o">=</span> <span class="n">get_ping_key</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="k">if</span> <span class="ow">not</span> <span class="n">redis_client</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">ping_key</span><span class="p">):</span> + <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">"missing ping (IP: </span><span class="si">%s</span><span class="s2">) / request: </span><span class="si">%s</span><span class="s2">"</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">ping_key</span><span class="p">)</span> + <span class="k">return</span> <span class="kc">True</span> + + <span class="k">if</span> <span class="n">renew</span><span class="p">:</span> + <span class="n">redis_client</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">ping_key</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">ex</span><span class="o">=</span><span class="n">PING_LIVE_TIME</span><span class="p">)</span> + + <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"found ping for (client) network </span><span class="si">%s</span><span class="s2"> -> </span><span class="si">%s</span><span class="s2">"</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">ping_key</span><span class="p">)</span> + <span class="k">return</span> <span class="kc">False</span></div> + + + +<div class="viewcode-block" id="ping"> +<a class="viewcode-back" href="../../../src/searx.botdetection.html#searx.botdetection.link_token.ping">[docs]</a> +<span class="k">def</span> <span class="nf">ping</span><span class="p">(</span><span class="n">request</span><span class="p">:</span> <span class="n">flask</span><span class="o">.</span><span class="n">Request</span><span class="p">,</span> <span class="n">token</span><span class="p">:</span> <span class="nb">str</span><span class="p">):</span> +<span class="w"> </span><span class="sd">"""This function is called by a request to URL ``/client<token>.css``. If</span> +<span class="sd"> ``token`` is valid a :py:obj:`PING_KEY` for the client is stored in the DB.</span> +<span class="sd"> The expire time of this ping-key is :py:obj:`PING_LIVE_TIME`.</span> + +<span class="sd"> """</span> + <span class="kn">from</span> <span class="nn">.</span> <span class="kn">import</span> <span class="n">redis_client</span><span class="p">,</span> <span class="n">cfg</span> <span class="c1"># pylint: disable=import-outside-toplevel, cyclic-import</span> + + <span class="k">if</span> <span class="ow">not</span> <span class="n">redis_client</span><span class="p">:</span> + <span class="k">return</span> + <span class="k">if</span> <span class="ow">not</span> <span class="n">token_is_valid</span><span class="p">(</span><span class="n">token</span><span class="p">):</span> + <span class="k">return</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="n">ping_key</span> <span class="o">=</span> <span class="n">get_ping_key</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">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"store ping_key for (client) network </span><span class="si">%s</span><span class="s2"> (IP </span><span class="si">%s</span><span class="s2">) -> </span><span class="si">%s</span><span class="s2">"</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">real_ip</span><span class="p">,</span> <span class="n">ping_key</span><span class="p">)</span> + <span class="n">redis_client</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">ping_key</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">ex</span><span class="o">=</span><span class="n">PING_LIVE_TIME</span><span class="p">)</span></div> + + + +<div class="viewcode-block" id="get_ping_key"> +<a class="viewcode-back" href="../../../src/searx.botdetection.html#searx.botdetection.link_token.get_ping_key">[docs]</a> +<span class="k">def</span> <span class="nf">get_ping_key</span><span class="p">(</span><span class="n">network</span><span class="p">:</span> <span class="n">IPv4Network</span> <span class="o">|</span> <span class="n">IPv6Network</span><span class="p">,</span> <span class="n">request</span><span class="p">:</span> <span class="n">flask</span><span class="o">.</span><span class="n">Request</span><span class="p">)</span> <span class="o">-></span> <span class="nb">str</span><span class="p">:</span> +<span class="w"> </span><span class="sd">"""Generates a hashed key that fits (more or less) to a *WEB-browser</span> +<span class="sd"> session* in a network."""</span> + <span class="k">return</span> <span class="p">(</span> + <span class="n">PING_KEY</span> + <span class="o">+</span> <span class="s2">"["</span> + <span class="o">+</span> <span class="n">secret_hash</span><span class="p">(</span> + <span class="n">network</span><span class="o">.</span><span class="n">compressed</span> <span class="o">+</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'Accept-Language'</span><span class="p">,</span> <span class="s1">''</span><span class="p">)</span> <span class="o">+</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'User-Agent'</span><span class="p">,</span> <span class="s1">''</span><span class="p">)</span> + <span class="p">)</span> + <span class="o">+</span> <span class="s2">"]"</span> + <span class="p">)</span></div> + + + +<span class="k">def</span> <span class="nf">token_is_valid</span><span class="p">(</span><span class="n">token</span><span class="p">)</span> <span class="o">-></span> <span class="nb">bool</span><span class="p">:</span> + <span class="n">valid</span> <span class="o">=</span> <span class="n">token</span> <span class="o">==</span> <span class="n">get_token</span><span class="p">()</span> + <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"token is valid --> </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">valid</span><span class="p">)</span> + <span class="k">return</span> <span class="n">valid</span> + + +<div class="viewcode-block" id="get_token"> +<a class="viewcode-back" href="../../../src/searx.botdetection.html#searx.botdetection.link_token.get_token">[docs]</a> +<span class="k">def</span> <span class="nf">get_token</span><span class="p">()</span> <span class="o">-></span> <span class="nb">str</span><span class="p">:</span> +<span class="w"> </span><span class="sd">"""Returns current token. If there is no currently active token a new token</span> +<span class="sd"> is generated randomly and stored in the redis DB.</span> + +<span class="sd"> - :py:obj:`TOKEN_LIVE_TIME`</span> +<span class="sd"> - :py:obj:`TOKEN_KEY`</span> + +<span class="sd"> """</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="k">if</span> <span class="ow">not</span> <span class="n">redis_client</span><span class="p">:</span> + <span class="c1"># This function is also called when limiter is inactive / no redis DB</span> + <span class="c1"># (see render function in webapp.py)</span> + <span class="k">return</span> <span class="s1">'12345678'</span> + <span class="n">token</span> <span class="o">=</span> <span class="n">redis_client</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">TOKEN_KEY</span><span class="p">)</span> + <span class="k">if</span> <span class="n">token</span><span class="p">:</span> + <span class="n">token</span> <span class="o">=</span> <span class="n">token</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s1">'UTF-8'</span><span class="p">)</span> + <span class="k">else</span><span class="p">:</span> + <span class="n">token</span> <span class="o">=</span> <span class="s1">''</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">choice</span><span class="p">(</span><span class="n">string</span><span class="o">.</span><span class="n">ascii_lowercase</span> <span class="o">+</span> <span class="n">string</span><span class="o">.</span><span class="n">digits</span><span class="p">)</span> <span class="k">for</span> <span class="n">_</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">16</span><span class="p">))</span> + <span class="n">redis_client</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">TOKEN_KEY</span><span class="p">,</span> <span class="n">token</span><span class="p">,</span> <span class="n">ex</span><span class="o">=</span><span class="n">TOKEN_LIVE_TIME</span><span class="p">)</span> + <span class="k">return</span> <span class="n">token</span></div> + +</pre></div> + + <div class="clearer"></div> + </div> + </div> + </div> + <span id="sidebar-top"></span> + <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> + <div class="sphinxsidebarwrapper"> + + + <p class="logo"><a href="../../../index.html"> + <img class="logo" src="../../../_static/searxng-wordmark.svg" alt="Logo"/> + </a></p> + + +<h3><a href="../../../index.html">Table of Contents</a></h3> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../../../user/index.html">User information</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../../own-instance.html">Why use a private instance?</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../../admin/index.html">Administrator documentation</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../../dev/index.html">Developer documentation</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../../utils/index.html">DevOps tooling box</a></li> +<li class="toctree-l1"><a class="reference internal" href="../../../src/index.html">Source-Code</a></li> +</ul> + + <h3>Project Links</h3> + <ul> + <li><a href="https://github.com/searxng/searxng/tree/master">Source</a> + + <li><a href="https://github.com/searxng/searxng/wiki">Wiki</a> + + <li><a href="https://searx.space">Public instances</a> + + <li><a href="https://github.com/searxng/searxng/issues">Issue Tracker</a> + </ul><h3>Navigation</h3> +<ul> + <li><a href="../../../index.html">Overview</a> + <ul> + <li><a href="../../index.html">Module code</a> + + + </ul> + </li> + </ul> + </li> +</ul> +<search id="searchbox" style="display: none" role="search"> + <h3 id="searchlabel">Quick search</h3> + <div class="searchformwrapper"> + <form class="search" action="../../../search.html" method="get"> + <input type="text" name="q" aria-labelledby="searchlabel" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"/> + <input type="submit" value="Go" /> + </form> + </div> +</search> +<script>document.getElementById('searchbox').style.display = "block"</script> + </div> + </div> + <div class="clearer"></div> + </div> + + <div class="footer" role="contentinfo"> + © Copyright SearXNG team. + </div> + <script src="../../../_static/version_warning_offset.js"></script> + + </body> +</html>
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