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<h1>Source code for searx.botdetection.trusted_proxies</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;Implementation of a middleware to determine the real IP of an HTTP request</span>
<span class="sd">(:py:obj:`flask.request.remote_addr`) behind a proxy chain.&quot;&quot;&quot;</span>
<span class="c1"># pylint: disable=too-many-branches</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">typing</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="nn">t</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">collections</span><span class="w"> </span><span class="kn">import</span> <span class="n">abc</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">IPv4Address</span><span class="p">,</span> <span class="n">IPv6Address</span><span class="p">,</span> <span class="n">ip_address</span><span class="p">,</span> <span class="n">ip_network</span><span class="p">,</span> <span class="n">IPv4Network</span><span class="p">,</span> <span class="n">IPv6Network</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">werkzeug.http</span><span class="w"> </span><span class="kn">import</span> <span class="n">parse_list_header</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">config</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">._helpers</span><span class="w"> </span><span class="kn">import</span> <span class="n">log_error_only_once</span><span class="p">,</span> <span class="n">logger</span>
<span class="k">if</span> <span class="n">t</span><span class="o">.</span><span class="n">TYPE_CHECKING</span><span class="p">:</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">_typeshed.wsgi</span><span class="w"> </span><span class="kn">import</span> <span class="n">StartResponse</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">_typeshed.wsgi</span><span class="w"> </span><span class="kn">import</span> <span class="n">WSGIApplication</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">_typeshed.wsgi</span><span class="w"> </span><span class="kn">import</span> <span class="n">WSGIEnvironment</span>
<div class="viewcode-block" id="ProxyFix">
<a class="viewcode-back" href="../../../src/searx.botdetection.html#searx.botdetection.ProxyFix">[docs]</a>
<span class="k">class</span><span class="w"> </span><span class="nc">ProxyFix</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;A middleware like the ProxyFix_ class, where the ``x_for`` argument is</span>
<span class="sd"> replaced by a method that determines the number of trusted proxies via the</span>
<span class="sd"> ``botdetection.trusted_proxies`` setting.</span>
<span class="sd"> .. sidebar:: :py:obj:`flask.Request.remote_addr`</span>
<span class="sd"> SearXNG uses Werkzeug&#39;s ProxyFix_ (with it default ``x_for=1``).</span>
<span class="sd"> The remote IP (:py:obj:`flask.Request.remote_addr`) of the request is taken</span>
<span class="sd"> from (first match):</span>
<span class="sd"> - X-Forwarded-For_: If the header is set, the first untrusted IP that comes</span>
<span class="sd"> before the IPs that are still part of the ``botdetection.trusted_proxies``</span>
<span class="sd"> is used.</span>
<span class="sd"> - `X-Real-IP &lt;https://github.com/searxng/searxng/issues/1237#issuecomment-1147564516&gt;`__:</span>
<span class="sd"> If X-Forwarded-For_ is not set, `X-Real-IP` is used</span>
<span class="sd"> (``botdetection.trusted_proxies`` is ignored).</span>
<span class="sd"> If none of the header is set, the REMOTE_ADDR_ from the WSGI layer is used.</span>
<span class="sd"> If (for whatever reasons) none IP can be determined, an error message is</span>
<span class="sd"> displayed and ``100::`` is used instead (:rfc:`6666`).</span>
<span class="sd"> .. _ProxyFix:</span>
<span class="sd"> https://werkzeug.palletsprojects.com/middleware/proxy_fix/</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"> .. _REMOTE_ADDR:</span>
<span class="sd"> https://wsgi.readthedocs.io/en/latest/proposals-2.0.html#making-some-keys-required</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">wsgi_app</span><span class="p">:</span> <span class="n">WSGIApplication</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kc">None</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">wsgi_app</span> <span class="o">=</span> <span class="n">wsgi_app</span>
<span class="k">def</span><span class="w"> </span><span class="nf">trusted_proxies</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">list</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">cfg</span> <span class="o">=</span> <span class="n">config</span><span class="o">.</span><span class="n">get_global_cfg</span><span class="p">()</span>
<span class="n">proxy_list</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="n">cfg</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;botdetection.trusted_proxies&quot;</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="p">[])</span>
<span class="k">return</span> <span class="p">[</span><span class="n">ip_network</span><span class="p">(</span><span class="n">net</span><span class="p">,</span> <span class="n">strict</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> <span class="k">for</span> <span class="n">net</span> <span class="ow">in</span> <span class="n">proxy_list</span><span class="p">]</span>
<span class="k">def</span><span class="w"> </span><span class="nf">trusted_remote_addr</span><span class="p">(</span>
<span class="bp">self</span><span class="p">,</span>
<span class="n">x_forwarded_for</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="n">IPv4Address</span> <span class="o">|</span> <span class="n">IPv6Address</span><span class="p">],</span>
<span class="n">trusted_proxies</span><span class="p">:</span> <span class="nb">list</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="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
<span class="c1"># always rtl</span>
<span class="k">for</span> <span class="n">addr</span> <span class="ow">in</span> <span class="nb">reversed</span><span class="p">(</span><span class="n">x_forwarded_for</span><span class="p">):</span>
<span class="n">trust</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">for</span> <span class="n">net</span> <span class="ow">in</span> <span class="n">trusted_proxies</span><span class="p">:</span>
<span class="k">if</span> <span class="n">addr</span><span class="o">.</span><span class="n">version</span> <span class="o">==</span> <span class="n">net</span><span class="o">.</span><span class="n">version</span> <span class="ow">and</span> <span class="n">addr</span> <span class="ow">in</span> <span class="n">net</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">&quot;trust proxy </span><span class="si">%s</span><span class="s2"> (member of </span><span class="si">%s</span><span class="s2">)&quot;</span><span class="p">,</span> <span class="n">addr</span><span class="p">,</span> <span class="n">net</span><span class="p">)</span>
<span class="n">trust</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">break</span>
<span class="c1"># client address</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">trust</span><span class="p">:</span>
<span class="k">return</span> <span class="n">addr</span><span class="o">.</span><span class="n">compressed</span>
<span class="c1"># fallback to first address</span>
<span class="k">return</span> <span class="n">x_forwarded_for</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">compressed</span>
<span class="k">def</span><span class="w"> </span><span class="fm">__call__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">environ</span><span class="p">:</span> <span class="n">WSGIEnvironment</span><span class="p">,</span> <span class="n">start_response</span><span class="p">:</span> <span class="n">StartResponse</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">abc</span><span class="o">.</span><span class="n">Iterable</span><span class="p">[</span><span class="nb">bytes</span><span class="p">]:</span>
<span class="c1"># pylint: disable=too-many-statements</span>
<span class="n">trusted_proxies</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">trusted_proxies</span><span class="p">()</span>
<span class="c1"># We do not rely on the REMOTE_ADDR from the WSGI environment / the</span>
<span class="c1"># variable is first removed from the WSGI environment and explicitly set</span>
<span class="c1"># in this function!</span>
<span class="n">orig_remote_addr</span><span class="p">:</span> <span class="nb">str</span> <span class="o">|</span> <span class="kc">None</span> <span class="o">=</span> <span class="n">environ</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s2">&quot;REMOTE_ADDR&quot;</span><span class="p">)</span>
<span class="c1"># Validate the IPs involved in this game and delete all invalid ones</span>
<span class="c1"># from the WSGI environment.</span>
<span class="k">if</span> <span class="n">orig_remote_addr</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">addr</span> <span class="o">=</span> <span class="n">ip_address</span><span class="p">(</span><span class="n">orig_remote_addr</span><span class="p">)</span>
<span class="k">if</span> <span class="n">addr</span><span class="o">.</span><span class="n">version</span> <span class="o">==</span> <span class="mi">6</span> <span class="ow">and</span> <span class="n">addr</span><span class="o">.</span><span class="n">ipv4_mapped</span><span class="p">:</span>
<span class="n">addr</span> <span class="o">=</span> <span class="n">addr</span><span class="o">.</span><span class="n">ipv4_mapped</span>
<span class="n">orig_remote_addr</span> <span class="o">=</span> <span class="n">addr</span><span class="o">.</span><span class="n">compressed</span>
<span class="k">except</span> <span class="ne">ValueError</span> <span class="k">as</span> <span class="n">exc</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;REMOTE_ADDR: </span><span class="si">%s</span><span class="s2"> / discard REMOTE_ADDR from WSGI environment&quot;</span><span class="p">,</span> <span class="n">exc</span><span class="p">)</span>
<span class="n">orig_remote_addr</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">x_real_ip</span><span class="p">:</span> <span class="nb">str</span> <span class="o">|</span> <span class="kc">None</span> <span class="o">=</span> <span class="n">environ</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;HTTP_X_REAL_IP&quot;</span><span class="p">)</span>
<span class="k">if</span> <span class="n">x_real_ip</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">addr</span> <span class="o">=</span> <span class="n">ip_address</span><span class="p">(</span><span class="n">x_real_ip</span><span class="p">)</span>
<span class="k">if</span> <span class="n">addr</span><span class="o">.</span><span class="n">version</span> <span class="o">==</span> <span class="mi">6</span> <span class="ow">and</span> <span class="n">addr</span><span class="o">.</span><span class="n">ipv4_mapped</span><span class="p">:</span>
<span class="n">addr</span> <span class="o">=</span> <span class="n">addr</span><span class="o">.</span><span class="n">ipv4_mapped</span>
<span class="n">x_real_ip</span> <span class="o">=</span> <span class="n">addr</span><span class="o">.</span><span class="n">compressed</span>
<span class="k">except</span> <span class="ne">ValueError</span> <span class="k">as</span> <span class="n">exc</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;X-Real-IP: </span><span class="si">%s</span><span class="s2"> / discard HTTP_X_REAL_IP from WSGI environment&quot;</span><span class="p">,</span> <span class="n">exc</span><span class="p">)</span>
<span class="n">environ</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s2">&quot;HTTP_X_REAL_IP&quot;</span><span class="p">)</span>
<span class="n">x_real_ip</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">x_forwarded_for</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="n">IPv4Address</span> <span class="o">|</span> <span class="n">IPv6Address</span><span class="p">]</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">if</span> <span class="n">environ</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;HTTP_X_FORWARDED_FOR&quot;</span><span class="p">):</span>
<span class="k">for</span> <span class="n">x_for_ip</span> <span class="ow">in</span> <span class="n">parse_list_header</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">environ</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;HTTP_X_FORWARDED_FOR&quot;</span><span class="p">))):</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">addr</span> <span class="o">=</span> <span class="n">ip_address</span><span class="p">(</span><span class="n">x_for_ip</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">ValueError</span> <span class="k">as</span> <span class="n">exc</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;X-Forwarded-For: </span><span class="si">%s</span><span class="s2"> / discard HTTP_X_FORWARDED_FOR from WSGI environment&quot;</span><span class="p">,</span> <span class="n">exc</span><span class="p">)</span>
<span class="n">environ</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s2">&quot;HTTP_X_FORWARDED_FOR&quot;</span><span class="p">)</span>
<span class="n">x_forwarded_for</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">break</span>
<span class="k">if</span> <span class="n">addr</span><span class="o">.</span><span class="n">version</span> <span class="o">==</span> <span class="mi">6</span> <span class="ow">and</span> <span class="n">addr</span><span class="o">.</span><span class="n">ipv4_mapped</span><span class="p">:</span>
<span class="n">addr</span> <span class="o">=</span> <span class="n">addr</span><span class="o">.</span><span class="n">ipv4_mapped</span>
<span class="n">x_forwarded_for</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">addr</span><span class="p">)</span>
<span class="c1"># log questionable WSGI environments</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">x_forwarded_for</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">x_real_ip</span><span class="p">:</span>
<span class="n">log_error_only_once</span><span class="p">(</span><span class="s2">&quot;X-Forwarded-For nor X-Real-IP header is set!&quot;</span><span class="p">)</span>
<span class="k">if</span> <span class="n">x_forwarded_for</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">trusted_proxies</span><span class="p">:</span>
<span class="n">log_error_only_once</span><span class="p">(</span><span class="s2">&quot;missing botdetection.trusted_proxies config&quot;</span><span class="p">)</span>
<span class="c1"># without trusted_proxies, this variable is useless for determining</span>
<span class="c1"># the real IP</span>
<span class="n">x_forwarded_for</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># securing the WSGI environment variables that are adjusted</span>
<span class="n">environ</span><span class="o">.</span><span class="n">update</span><span class="p">({</span><span class="s2">&quot;botdetection.trusted_proxies.orig&quot;</span><span class="p">:</span> <span class="p">{</span><span class="s2">&quot;REMOTE_ADDR&quot;</span><span class="p">:</span> <span class="n">orig_remote_addr</span><span class="p">}})</span>
<span class="c1"># determine *the real IP*</span>
<span class="k">if</span> <span class="n">x_forwarded_for</span><span class="p">:</span>
<span class="n">environ</span><span class="p">[</span><span class="s2">&quot;REMOTE_ADDR&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">trusted_remote_addr</span><span class="p">(</span><span class="n">x_forwarded_for</span><span class="p">,</span> <span class="n">trusted_proxies</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">x_real_ip</span><span class="p">:</span>
<span class="n">environ</span><span class="p">[</span><span class="s2">&quot;REMOTE_ADDR&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">x_real_ip</span>
<span class="k">elif</span> <span class="n">orig_remote_addr</span><span class="p">:</span>
<span class="n">environ</span><span class="p">[</span><span class="s2">&quot;REMOTE_ADDR&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">orig_remote_addr</span>
<span class="k">else</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;No remote IP could be determined, use black-hole address: 100::&quot;</span><span class="p">)</span>
<span class="n">environ</span><span class="p">[</span><span class="s2">&quot;REMOTE_ADDR&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="s2">&quot;100::&quot;</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">_</span> <span class="o">=</span> <span class="n">ip_address</span><span class="p">(</span><span class="n">environ</span><span class="p">[</span><span class="s2">&quot;REMOTE_ADDR&quot;</span><span class="p">])</span>
<span class="k">except</span> <span class="ne">ValueError</span> <span class="k">as</span> <span class="n">exc</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;REMOTE_ADDR: </span><span class="si">%s</span><span class="s2">, use black-hole address: 100::&quot;</span><span class="p">,</span> <span class="n">exc</span><span class="p">)</span>
<span class="n">environ</span><span class="p">[</span><span class="s2">&quot;REMOTE_ADDR&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="s2">&quot;100::&quot;</span>
<span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;final REMOTE_ADDR is: </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">environ</span><span class="p">[</span><span class="s2">&quot;REMOTE_ADDR&quot;</span><span class="p">])</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">wsgi_app</span><span class="p">(</span><span class="n">environ</span><span class="p">,</span> <span class="n">start_response</span><span class="p">)</span></div>
</pre></div>
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