searX
/
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espejo de https://github.com/searx/searx


			
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  <section id="how-to-protect-an-instance">
<span id="searx-filtron"></span><h1>How to protect an instance<a class="headerlink" href="#how-to-protect-an-instance" title="Permalink to this heading">¶</a></h1>
<aside class="sidebar">
<p class="sidebar-title">further reading</p>
<ul class="simple">
<li><p><a class="reference internal" href="../utils/filtron.sh.html#filtron-sh"><span class="std std-ref">utils/filtron.sh</span></a></p></li>
<li><p><a class="reference internal" href="installation-nginx.html#nginx-searx-site"><span class="std std-ref">A nginx searx site</span></a></p></li>
</ul>
</aside>
<nav class="contents local" id="contents">
<p class="topic-title">Contents</p>
<ul class="simple">
<li><p><a class="reference internal" href="#filtron-go" id="id2">filtron &amp; go</a></p></li>
<li><p><a class="reference internal" href="#sample-configuration-of-filtron" id="id3">Sample configuration of filtron</a></p></li>
<li><p><a class="reference internal" href="#route-request-through-filtron" id="id4">Route request through filtron</a></p></li>
</ul>
</nav>
<p>Searx depends on external search services.  To avoid the abuse of these services
it is advised to limit the number of requests processed by searx.</p>
<p>An application firewall, <a class="reference external" href="https://github.com/asciimoo/filtron">filtron</a> solves exactly this problem.  Filtron is just
a middleware between your web server (nginx, apache, …) and searx, we describe
such infratructures in chapter: <a class="reference internal" href="architecture.html#architecture"><span class="std std-ref">Architecture</span></a>.</p>
<section id="filtron-go">
<h2><a class="toc-backref" href="#id2" role="doc-backlink">filtron &amp; go</a><a class="headerlink" href="#filtron-go" title="Permalink to this heading">¶</a></h2>
<p>Filtron needs <a class="reference external" href="https://golang.org/">Go</a> installed.  If <a class="reference external" href="https://golang.org/">Go</a> is preinstalled, <a class="reference external" href="https://github.com/asciimoo/filtron">filtron</a> is simply
installed by <code class="docutils literal notranslate"><span class="pre">go</span> <span class="pre">get</span></code> package management (see <a class="reference external" href="https://github.com/asciimoo/filtron/blob/master/README.md">filtron README</a>).  If you use
filtron as middleware, a more isolated setup is recommended.  To simplify such
an installation and the maintenance of, use our script <a class="reference internal" href="../utils/filtron.sh.html#filtron-sh"><span class="std std-ref">utils/filtron.sh</span></a>.</p>
</section>
<section id="sample-configuration-of-filtron">
<span id="id1"></span><h2><a class="toc-backref" href="#id3" role="doc-backlink">Sample configuration of filtron</a><a class="headerlink" href="#sample-configuration-of-filtron" title="Permalink to this heading">¶</a></h2>
<aside class="sidebar">
<p class="sidebar-title">Tooling box</p>
<ul class="simple">
<li><p><a class="reference external" href="https://github.com/searx/searx/blob/master/utils/templates/etc/filtron/rules.json">/etc/filtron/rules.json</a></p></li>
</ul>
</aside>
<p>An example configuration can be find below. This configuration limits the access
of:</p>
<ul class="simple">
<li><p>scripts or applications (roboagent limit)</p></li>
<li><p>webcrawlers (botlimit)</p></li>
<li><p>IPs which send too many requests (IP limit)</p></li>
<li><p>too many json, csv, etc. requests (rss/json limit)</p></li>
<li><p>the same UserAgent of if too many requests (useragent limit)</p></li>
</ul>
<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="w"></span>
<span class="w">    </span><span class="p">{</span><span class="w"></span>
<span class="w">        </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;search request&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">        </span><span class="nt">&quot;filters&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w">            </span><span class="s2">&quot;Param:q&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">            </span><span class="s2">&quot;Path=^(/|/search)$&quot;</span><span class="w"></span>
<span class="w">        </span><span class="p">],</span><span class="w"></span>
<span class="w">        </span><span class="nt">&quot;interval&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;&lt;time-interval-in-sec (int)&gt;&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">        </span><span class="nt">&quot;limit&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;&lt;max-request-number-in-interval (int)&gt;&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">        </span><span class="nt">&quot;subrules&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w">            </span><span class="p">{</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;missing Accept-Language&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;filters&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">&quot;!Header:Accept-Language&quot;</span><span class="p">],</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;limit&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;&lt;max-request-number-in-interval (int)&gt;&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;stop&quot;</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;actions&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w">                    </span><span class="p">{</span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="s2">&quot;log&quot;</span><span class="p">},</span><span class="w"></span>
<span class="w">                    </span><span class="p">{</span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;block&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                     </span><span class="nt">&quot;params&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="nt">&quot;message&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;Rate limit exceeded&quot;</span><span class="p">}}</span><span class="w"></span>
<span class="w">                </span><span class="p">]</span><span class="w"></span>
<span class="w">            </span><span class="p">},</span><span class="w"></span>
<span class="w">            </span><span class="p">{</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;suspiciously Connection=close header&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;filters&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">&quot;Header:Connection=close&quot;</span><span class="p">],</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;limit&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;&lt;max-request-number-in-interval (int)&gt;&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;stop&quot;</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;actions&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w">                    </span><span class="p">{</span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="s2">&quot;log&quot;</span><span class="p">},</span><span class="w"></span>
<span class="w">                    </span><span class="p">{</span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;block&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                     </span><span class="nt">&quot;params&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="nt">&quot;message&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;Rate limit exceeded&quot;</span><span class="p">}}</span><span class="w"></span>
<span class="w">                </span><span class="p">]</span><span class="w"></span>
<span class="w">            </span><span class="p">},</span><span class="w"></span>
<span class="w">            </span><span class="p">{</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;IP limit&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;interval&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;&lt;time-interval-in-sec (int)&gt;&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;limit&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;&lt;max-request-number-in-interval (int)&gt;&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;stop&quot;</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;aggregations&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w">                    </span><span class="s2">&quot;Header:X-Forwarded-For&quot;</span><span class="w"></span>
<span class="w">                </span><span class="p">],</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;actions&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w">                    </span><span class="p">{</span><span class="w"> </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;log&quot;</span><span class="p">},</span><span class="w"></span>
<span class="w">                    </span><span class="p">{</span><span class="w"> </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;block&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                      </span><span class="nt">&quot;params&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w">                          </span><span class="nt">&quot;message&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;Rate limit exceeded&quot;</span><span class="w"></span>
<span class="w">                      </span><span class="p">}</span><span class="w"></span>
<span class="w">                    </span><span class="p">}</span><span class="w"></span>
<span class="w">                </span><span class="p">]</span><span class="w"></span>
<span class="w">            </span><span class="p">},</span><span class="w"></span>
<span class="w">            </span><span class="p">{</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;rss/json limit&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;filters&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w">                    </span><span class="s2">&quot;Param:format=(csv|json|rss)&quot;</span><span class="w"></span>
<span class="w">                </span><span class="p">],</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;interval&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;&lt;time-interval-in-sec (int)&gt;&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;limit&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;&lt;max-request-number-in-interval (int)&gt;&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;stop&quot;</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;actions&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w">                    </span><span class="p">{</span><span class="w"> </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;log&quot;</span><span class="p">},</span><span class="w"></span>
<span class="w">                    </span><span class="p">{</span><span class="w"> </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;block&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                      </span><span class="nt">&quot;params&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w">                          </span><span class="nt">&quot;message&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;Rate limit exceeded&quot;</span><span class="w"></span>
<span class="w">                      </span><span class="p">}</span><span class="w"></span>
<span class="w">                    </span><span class="p">}</span><span class="w"></span>
<span class="w">                </span><span class="p">]</span><span class="w"></span>
<span class="w">            </span><span class="p">},</span><span class="w"></span>
<span class="w">            </span><span class="p">{</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;useragent limit&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;interval&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;&lt;time-interval-in-sec (int)&gt;&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;limit&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;&lt;max-request-number-in-interval (int)&gt;&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;aggregations&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w">                    </span><span class="s2">&quot;Header:User-Agent&quot;</span><span class="w"></span>
<span class="w">                </span><span class="p">],</span><span class="w"></span>
<span class="w">                </span><span class="nt">&quot;actions&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w">                    </span><span class="p">{</span><span class="w"> </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;log&quot;</span><span class="p">},</span><span class="w"></span>
<span class="w">                    </span><span class="p">{</span><span class="w"> </span><span class="nt">&quot;name&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;block&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">                      </span><span class="nt">&quot;params&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w">                          </span><span class="nt">&quot;message&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;Rate limit exceeded&quot;</span><span class="w"></span>
<span class="w">                      </span><span class="p">}</span><span class="w"></span>
<span class="w">                    </span><span class="p">}</span><span class="w"></span>
<span class="w">                </span><span class="p">]</span><span class="w"></span>
<span class="w">            </span><span class="p">}</span><span class="w"></span>
<span class="w">        </span><span class="p">]</span><span class="w"></span>
<span class="w">    </span><span class="p">}</span><span class="w"></span>
<span class="p">]</span><span class="w"></span>
</pre></div>
</div>
</section>
<section id="route-request-through-filtron">
<span id="filtron-route-request"></span><h2><a class="toc-backref" href="#id4" role="doc-backlink">Route request through filtron</a><a class="headerlink" href="#route-request-through-filtron" title="Permalink to this heading">¶</a></h2>
<aside class="sidebar">
<p class="sidebar-title">further reading</p>
<ul class="simple">
<li><p><a class="reference internal" href="../utils/filtron.sh.html#filtron-sh-overview"><span class="std std-ref">Overview</span></a></p></li>
<li><p><a class="reference internal" href="installation-nginx.html#installation-nginx"><span class="std std-ref">Install with nginx</span></a></p></li>
<li><p><a class="reference internal" href="installation-apache.html#installation-apache"><span class="std std-ref">Install with apache</span></a></p></li>
</ul>
</aside>
<p>Filtron can be started using the following command:</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>$ filtron -rules rules.json
</pre></div>
</div>
<p>It listens on <code class="docutils literal notranslate"><span class="pre">127.0.0.1:4004</span></code> and forwards filtered requests to
<code class="docutils literal notranslate"><span class="pre">127.0.0.1:8888</span></code> by default.</p>
<p>Use it along with <code class="docutils literal notranslate"><span class="pre">nginx</span></code> with the following example configuration.</p>
<div class="highlight-nginx notranslate"><div class="highlight"><pre><span></span><span class="c1"># https://example.org/searx</span>

<span class="k">location</span><span class="w"> </span><span class="s">/searx</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w">    </span><span class="kn">proxy_pass</span><span class="w">         </span><span class="s">http://127.0.0.1:4004/</span><span class="p">;</span><span class="w"></span>

<span class="w">    </span><span class="kn">proxy_set_header</span><span class="w">   </span><span class="s">Host</span><span class="w">             </span><span class="nv">$host</span><span class="p">;</span><span class="w"></span>
<span class="w">    </span><span class="kn">proxy_set_header</span><span class="w">   </span><span class="s">Connection</span><span class="w">       </span><span class="nv">$http_connection</span><span class="p">;</span><span class="w"></span>
<span class="w">    </span><span class="kn">proxy_set_header</span><span class="w">   </span><span class="s">X-Real-IP</span><span class="w">        </span><span class="nv">$remote_addr</span><span class="p">;</span><span class="w"></span>
<span class="w">    </span><span class="kn">proxy_set_header</span><span class="w">   </span><span class="s">X-Forwarded-For</span><span class="w">  </span><span class="nv">$proxy_add_x_forwarded_for</span><span class="p">;</span><span class="w"></span>
<span class="w">    </span><span class="kn">proxy_set_header</span><span class="w">   </span><span class="s">X-Scheme</span><span class="w">         </span><span class="nv">$scheme</span><span class="p">;</span><span class="w"></span>
<span class="w">    </span><span class="kn">proxy_set_header</span><span class="w">   </span><span class="s">X-Script-Name</span><span class="w">    </span><span class="s">/searx</span><span class="p">;</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>

<span class="k">location</span><span class="w"> </span><span class="s">/searx/static</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w">    </span><span class="kn">/usr/local/searx/searx-src/searx/static</span><span class="p">;</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</pre></div>
</div>
<p>Requests are coming from port 4004 going through filtron and then forwarded to
port 8888 where a searx is being run. For a complete setup see: <a class="reference internal" href="installation-nginx.html#nginx-searx-site"><span class="std std-ref">A nginx searx site</span></a>.</p>
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