mirror of https://github.com/searx/searx
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284 lines
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<li class="nav-item nav-item-this"><a href="">How to protect an instance</a></li>
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<div class="section" id="how-to-protect-an-instance">
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<span id="searx-filtron"></span><h1>How to protect an instance<a class="headerlink" href="#how-to-protect-an-instance" title="Permalink to this headline">¶</a></h1>
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<div class="sidebar">
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<p class="sidebar-title">further reading</p>
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<ul class="simple">
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<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>
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<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>
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</ul>
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</div>
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<div class="contents local topic" id="contents">
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<p class="topic-title">Contents</p>
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<ul class="simple">
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<li><p><a class="reference internal" href="#filtron-go" id="id2">filtron & go</a></p></li>
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<li><p><a class="reference internal" href="#sample-configuration-of-filtron" id="id3">Sample configuration of filtron</a></p></li>
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<li><p><a class="reference internal" href="#route-request-through-filtron" id="id4">Route request through filtron</a></p></li>
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</ul>
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</div>
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<p>Searx depends on external search services. To avoid the abuse of these services
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it is advised to limit the number of requests processed by searx.</p>
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<p>An application firewall, <a class="reference external" href="https://github.com/asciimoo/filtron">filtron</a> solves exactly this problem. Filtron is just
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a middleware between your web server (nginx, apache, …) and searx, we describe
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such infratructures in chapter: <a class="reference internal" href="architecture.html#architecture"><span class="std std-ref">Architecture</span></a>.</p>
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<div class="section" id="filtron-go">
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<h2><a class="toc-backref" href="#id2">filtron & go</a><a class="headerlink" href="#filtron-go" title="Permalink to this headline">¶</a></h2>
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<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
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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
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filtron as middleware, a more isolated setup is recommended. To simplify such
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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>
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</div>
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<div class="section" id="sample-configuration-of-filtron">
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<span id="id1"></span><h2><a class="toc-backref" href="#id3">Sample configuration of filtron</a><a class="headerlink" href="#sample-configuration-of-filtron" title="Permalink to this headline">¶</a></h2>
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<div class="sidebar">
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<p class="sidebar-title">Tooling box</p>
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<ul class="simple">
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<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>
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</ul>
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</div>
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<p>An example configuration can be find below. This configuration limits the access
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of:</p>
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<ul class="simple">
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<li><p>scripts or applications (roboagent limit)</p></li>
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<li><p>webcrawlers (botlimit)</p></li>
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<li><p>IPs which send too many requests (IP limit)</p></li>
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<li><p>too many json, csv, etc. requests (rss/json limit)</p></li>
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<li><p>the same UserAgent of if too many requests (useragent limit)</p></li>
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</ul>
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<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">[</span>
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<span class="p">{</span>
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<span class="nt">"name"</span><span class="p">:</span> <span class="s2">"search request"</span><span class="p">,</span>
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<span class="nt">"filters"</span><span class="p">:</span> <span class="p">[</span>
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<span class="s2">"Param:q"</span><span class="p">,</span>
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<span class="s2">"Path=^(/|/search)$"</span>
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<span class="p">],</span>
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<span class="nt">"interval"</span><span class="p">:</span> <span class="s2">"<time-interval-in-sec (int)>"</span><span class="p">,</span>
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<span class="nt">"limit"</span><span class="p">:</span> <span class="s2">"<max-request-number-in-interval (int)>"</span><span class="p">,</span>
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<span class="nt">"subrules"</span><span class="p">:</span> <span class="p">[</span>
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<span class="p">{</span>
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<span class="nt">"name"</span><span class="p">:</span> <span class="s2">"missing Accept-Language"</span><span class="p">,</span>
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<span class="nt">"filters"</span><span class="p">:</span> <span class="p">[</span><span class="s2">"!Header:Accept-Language"</span><span class="p">],</span>
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<span class="nt">"limit"</span><span class="p">:</span> <span class="s2">"<max-request-number-in-interval (int)>"</span><span class="p">,</span>
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<span class="nt">"stop"</span><span class="p">:</span> <span class="kc">true</span><span class="p">,</span>
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<span class="nt">"actions"</span><span class="p">:</span> <span class="p">[</span>
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<span class="p">{</span><span class="nt">"name"</span><span class="p">:</span><span class="s2">"log"</span><span class="p">},</span>
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<span class="p">{</span><span class="nt">"name"</span><span class="p">:</span> <span class="s2">"block"</span><span class="p">,</span>
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<span class="nt">"params"</span><span class="p">:</span> <span class="p">{</span><span class="nt">"message"</span><span class="p">:</span> <span class="s2">"Rate limit exceeded"</span><span class="p">}}</span>
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<span class="p">]</span>
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<span class="p">},</span>
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<span class="p">{</span>
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<span class="nt">"name"</span><span class="p">:</span> <span class="s2">"suspiciously Connection=close header"</span><span class="p">,</span>
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<span class="nt">"filters"</span><span class="p">:</span> <span class="p">[</span><span class="s2">"Header:Connection=close"</span><span class="p">],</span>
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<span class="nt">"limit"</span><span class="p">:</span> <span class="s2">"<max-request-number-in-interval (int)>"</span><span class="p">,</span>
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<span class="nt">"stop"</span><span class="p">:</span> <span class="kc">true</span><span class="p">,</span>
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<span class="nt">"actions"</span><span class="p">:</span> <span class="p">[</span>
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<span class="p">{</span><span class="nt">"name"</span><span class="p">:</span><span class="s2">"log"</span><span class="p">},</span>
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<span class="p">{</span><span class="nt">"name"</span><span class="p">:</span> <span class="s2">"block"</span><span class="p">,</span>
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<span class="nt">"params"</span><span class="p">:</span> <span class="p">{</span><span class="nt">"message"</span><span class="p">:</span> <span class="s2">"Rate limit exceeded"</span><span class="p">}}</span>
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<span class="p">]</span>
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<span class="p">},</span>
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<span class="p">{</span>
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<span class="nt">"name"</span><span class="p">:</span> <span class="s2">"IP limit"</span><span class="p">,</span>
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<span class="nt">"interval"</span><span class="p">:</span> <span class="s2">"<time-interval-in-sec (int)>"</span><span class="p">,</span>
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<span class="nt">"limit"</span><span class="p">:</span> <span class="s2">"<max-request-number-in-interval (int)>"</span><span class="p">,</span>
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<span class="nt">"stop"</span><span class="p">:</span> <span class="kc">true</span><span class="p">,</span>
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<span class="nt">"aggregations"</span><span class="p">:</span> <span class="p">[</span>
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<span class="s2">"Header:X-Forwarded-For"</span>
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<span class="p">],</span>
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<span class="nt">"actions"</span><span class="p">:</span> <span class="p">[</span>
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<span class="p">{</span> <span class="nt">"name"</span><span class="p">:</span> <span class="s2">"log"</span><span class="p">},</span>
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<span class="p">{</span> <span class="nt">"name"</span><span class="p">:</span> <span class="s2">"block"</span><span class="p">,</span>
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<span class="nt">"params"</span><span class="p">:</span> <span class="p">{</span>
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<span class="nt">"message"</span><span class="p">:</span> <span class="s2">"Rate limit exceeded"</span>
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<span class="p">}</span>
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<span class="p">}</span>
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<span class="p">]</span>
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<span class="p">},</span>
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<span class="p">{</span>
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<span class="nt">"name"</span><span class="p">:</span> <span class="s2">"rss/json limit"</span><span class="p">,</span>
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<span class="nt">"filters"</span><span class="p">:</span> <span class="p">[</span>
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<span class="s2">"Param:format=(csv|json|rss)"</span>
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<span class="p">],</span>
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<span class="nt">"interval"</span><span class="p">:</span> <span class="s2">"<time-interval-in-sec (int)>"</span><span class="p">,</span>
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<span class="nt">"limit"</span><span class="p">:</span> <span class="s2">"<max-request-number-in-interval (int)>"</span><span class="p">,</span>
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<span class="nt">"stop"</span><span class="p">:</span> <span class="kc">true</span><span class="p">,</span>
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<span class="nt">"actions"</span><span class="p">:</span> <span class="p">[</span>
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<span class="p">{</span> <span class="nt">"name"</span><span class="p">:</span> <span class="s2">"log"</span><span class="p">},</span>
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<span class="p">{</span> <span class="nt">"name"</span><span class="p">:</span> <span class="s2">"block"</span><span class="p">,</span>
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<span class="nt">"params"</span><span class="p">:</span> <span class="p">{</span>
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<span class="nt">"message"</span><span class="p">:</span> <span class="s2">"Rate limit exceeded"</span>
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<span class="p">}</span>
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<span class="p">}</span>
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<span class="p">]</span>
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<span class="p">},</span>
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<span class="p">{</span>
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<span class="nt">"name"</span><span class="p">:</span> <span class="s2">"useragent limit"</span><span class="p">,</span>
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<span class="nt">"interval"</span><span class="p">:</span> <span class="s2">"<time-interval-in-sec (int)>"</span><span class="p">,</span>
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<span class="nt">"limit"</span><span class="p">:</span> <span class="s2">"<max-request-number-in-interval (int)>"</span><span class="p">,</span>
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<span class="nt">"aggregations"</span><span class="p">:</span> <span class="p">[</span>
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<span class="s2">"Header:User-Agent"</span>
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<span class="p">],</span>
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<span class="nt">"actions"</span><span class="p">:</span> <span class="p">[</span>
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<span class="p">{</span> <span class="nt">"name"</span><span class="p">:</span> <span class="s2">"log"</span><span class="p">},</span>
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<span class="p">{</span> <span class="nt">"name"</span><span class="p">:</span> <span class="s2">"block"</span><span class="p">,</span>
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<span class="nt">"params"</span><span class="p">:</span> <span class="p">{</span>
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<span class="nt">"message"</span><span class="p">:</span> <span class="s2">"Rate limit exceeded"</span>
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<span class="p">}</span>
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<span class="p">}</span>
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<span class="p">]</span>
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<span class="p">}</span>
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<span class="p">]</span>
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<span class="p">}</span>
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<span class="p">]</span>
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</pre></div>
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</div>
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</div>
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<div class="section" id="route-request-through-filtron">
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<span id="filtron-route-request"></span><h2><a class="toc-backref" href="#id4">Route request through filtron</a><a class="headerlink" href="#route-request-through-filtron" title="Permalink to this headline">¶</a></h2>
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<div class="sidebar">
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<p class="sidebar-title">further reading</p>
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<ul class="simple">
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<li><p><a class="reference internal" href="../utils/filtron.sh.html#filtron-sh-overview"><span class="std std-ref">Overview</span></a></p></li>
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<li><p><a class="reference internal" href="installation-nginx.html#installation-nginx"><span class="std std-ref">Install with nginx</span></a></p></li>
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<li><p><a class="reference internal" href="installation-apache.html#installation-apache"><span class="std std-ref">Install with apache</span></a></p></li>
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</ul>
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</div>
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<p>Filtron can be started using the following command:</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>$ filtron -rules rules.json
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</pre></div>
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</div>
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<p>It listens on <code class="docutils literal notranslate"><span class="pre">127.0.0.1:4004</span></code> and forwards filtered requests to
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<code class="docutils literal notranslate"><span class="pre">127.0.0.1:8888</span></code> by default.</p>
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<p>Use it along with <code class="docutils literal notranslate"><span class="pre">nginx</span></code> with the following example configuration.</p>
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<div class="highlight-nginx notranslate"><div class="highlight"><pre><span></span><span class="c1"># https://example.org/searx</span>
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<span class="k">location</span> <span class="s">/searx</span> <span class="p">{</span>
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<span class="kn">proxy_pass</span> <span class="s">http://127.0.0.1:4004/</span><span class="p">;</span>
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<span class="kn">proxy_set_header</span> <span class="s">Host</span> <span class="nv">$host</span><span class="p">;</span>
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<span class="kn">proxy_set_header</span> <span class="s">Connection</span> <span class="nv">$http_connection</span><span class="p">;</span>
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<span class="kn">proxy_set_header</span> <span class="s">X-Real-IP</span> <span class="nv">$remote_addr</span><span class="p">;</span>
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<span class="kn">proxy_set_header</span> <span class="s">X-Forwarded-For</span> <span class="nv">$proxy_add_x_forwarded_for</span><span class="p">;</span>
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<span class="kn">proxy_set_header</span> <span class="s">X-Scheme</span> <span class="nv">$scheme</span><span class="p">;</span>
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<span class="kn">proxy_set_header</span> <span class="s">X-Script-Name</span> <span class="s">/searx</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">location</span> <span class="s">/searx/static</span> <span class="p">{</span>
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<span class="kn">/usr/local/searx/searx-src/searx/static</span><span class="p">;</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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<p>Requests are coming from port 4004 going through filtron and then forwarded to
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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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</div>
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</div>
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<div class="clearer"></div>
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</div>
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</div>
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</div>
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<span id="sidebar-top"></span>
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<div class="sphinxsidebar" role="navigation" aria-label="main navigation">
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<div class="sphinxsidebarwrapper">
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<p class="logo"><a href="../index.html">
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<img class="logo" src="../_static/searx_logo_small.png" alt="Logo"/>
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</a></p>
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<h3>Project Links</h3>
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<ul>
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<li><a href="https://github.com/searx/searx">Source</a>
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<li><a href="https://github.com/searx/searx/wiki">Wiki</a>
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<li><a href="https://searx.space">Public instances</a>
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<li><a href="https://twitter.com/Searx_engine">Twitter</a>
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<li><a href="https://github.com/searx/searx/issues">Issue Tracker</a>
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</ul><h3>Navigation</h3>
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<ul>
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<li><a href="../index.html">Overview</a>
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<ul>
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<li><a href="index.html">Administrator documentation</a>
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<ul>
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<li>Previous: <a href="architecture.html" title="previous chapter">Architecture</a>
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<li>Next: <a href="morty.html" title="next chapter">How to setup result proxy</a></ul>
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</li>
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</ul>
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</li>
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</ul>
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<div id="searchbox" style="display: none" role="search">
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<h3 id="searchlabel">Quick search</h3>
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<div class="searchformwrapper">
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<form class="search" action="../search.html" method="get">
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<input type="text" name="q" aria-labelledby="searchlabel" />
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<input type="submit" value="Go" />
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</form>
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</div>
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</div>
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<script>$('#searchbox').show(0);</script>
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</div>
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</div>
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<div class="clearer"></div>
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</div>
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<div class="footer" role="contentinfo">
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© Copyright 2015-2020, Adam Tauber, Noémi Ványi.
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Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 3.5.3.
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