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<h1>Source code for certbot.ocsp</h1><div class="highlight"><pre>
<span></span><span class="sd">"""Tools for checking certificate revocation."""</span>
<span class="kn">import</span> <span class="nn">logging</span>
<span class="kn">import</span> <span class="nn">re</span>
<span class="kn">from</span> <span class="nn">subprocess</span> <span class="k">import</span> <span class="n">Popen</span><span class="p">,</span> <span class="n">PIPE</span>
<span class="kn">from</span> <span class="nn">certbot</span> <span class="k">import</span> <span class="n">errors</span>
<span class="kn">from</span> <span class="nn">certbot</span> <span class="k">import</span> <span class="n">util</span>
<span class="n">logger</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="vm">__name__</span><span class="p">)</span>
<div class="viewcode-block" id="RevocationChecker"><a class="viewcode-back" href="../../api/ocsp.html#certbot.ocsp.RevocationChecker">[docs]</a><span class="k">class</span> <span class="nc">RevocationChecker</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="s2">"This class figures out OCSP checking on this system, and performs it."</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">broken</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">util</span><span class="o">.</span><span class="n">exe_exists</span><span class="p">(</span><span class="s2">"openssl"</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">"openssl not installed, can't check revocation"</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">broken</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">return</span>
<span class="c1"># New versions of openssl want -header var=val, old ones want -header var val</span>
<span class="n">test_host_format</span> <span class="o">=</span> <span class="n">Popen</span><span class="p">([</span><span class="s2">"openssl"</span><span class="p">,</span> <span class="s2">"ocsp"</span><span class="p">,</span> <span class="s2">"-header"</span><span class="p">,</span> <span class="s2">"var"</span><span class="p">,</span> <span class="s2">"val"</span><span class="p">],</span>
<span class="n">stdout</span><span class="o">=</span><span class="n">PIPE</span><span class="p">,</span> <span class="n">stderr</span><span class="o">=</span><span class="n">PIPE</span><span class="p">,</span> <span class="n">universal_newlines</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="n">_out</span><span class="p">,</span> <span class="n">err</span> <span class="o">=</span> <span class="n">test_host_format</span><span class="o">.</span><span class="n">communicate</span><span class="p">()</span>
<span class="k">if</span> <span class="s2">"Missing ="</span> <span class="ow">in</span> <span class="n">err</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">host_args</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">host</span><span class="p">:</span> <span class="p">[</span><span class="s2">"Host="</span> <span class="o">+</span> <span class="n">host</span><span class="p">]</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">host_args</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">host</span><span class="p">:</span> <span class="p">[</span><span class="s2">"Host"</span><span class="p">,</span> <span class="n">host</span><span class="p">]</span>
<div class="viewcode-block" id="RevocationChecker.ocsp_revoked"><a class="viewcode-back" href="../../api/ocsp.html#certbot.ocsp.RevocationChecker.ocsp_revoked">[docs]</a> <span class="k">def</span> <span class="nf">ocsp_revoked</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">cert_path</span><span class="p">,</span> <span class="n">chain_path</span><span class="p">):</span>
<span class="sd">"""Get revoked status for a particular cert version.</span>
<span class="sd"> .. todo:: Make this a non-blocking call</span>
<span class="sd"> :param str cert_path: Path to certificate</span>
<span class="sd"> :param str chain_path: Path to intermediate cert</span>
<span class="sd"> :rtype bool or None:</span>
<span class="sd"> :returns: True if revoked; False if valid or the check failed</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">broken</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">False</span>
<span class="n">url</span><span class="p">,</span> <span class="n">host</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">determine_ocsp_server</span><span class="p">(</span><span class="n">cert_path</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">host</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">False</span>
<span class="c1"># jdkasten thanks "Bulletproof SSL and TLS - Ivan Ristic" for documenting this!</span>
<span class="n">cmd</span> <span class="o">=</span> <span class="p">[</span><span class="s2">"openssl"</span><span class="p">,</span> <span class="s2">"ocsp"</span><span class="p">,</span>
<span class="s2">"-no_nonce"</span><span class="p">,</span>
<span class="s2">"-issuer"</span><span class="p">,</span> <span class="n">chain_path</span><span class="p">,</span>
<span class="s2">"-cert"</span><span class="p">,</span> <span class="n">cert_path</span><span class="p">,</span>
<span class="s2">"-url"</span><span class="p">,</span> <span class="n">url</span><span class="p">,</span>
<span class="s2">"-CAfile"</span><span class="p">,</span> <span class="n">chain_path</span><span class="p">,</span>
<span class="s2">"-verify_other"</span><span class="p">,</span> <span class="n">chain_path</span><span class="p">,</span>
<span class="s2">"-trust_other"</span><span class="p">,</span>
<span class="s2">"-header"</span><span class="p">]</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">host_args</span><span class="p">(</span><span class="n">host</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">"Querying OCSP for </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">cert_path</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">" "</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">cmd</span><span class="p">))</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">output</span><span class="p">,</span> <span class="n">err</span> <span class="o">=</span> <span class="n">util</span><span class="o">.</span><span class="n">run_script</span><span class="p">(</span><span class="n">cmd</span><span class="p">,</span> <span class="n">log</span><span class="o">=</span><span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">)</span>
<span class="k">except</span> <span class="n">errors</span><span class="o">.</span><span class="n">SubprocessError</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">"OCSP check failed for </span><span class="si">%s</span><span class="s2"> (are we offline?)"</span><span class="p">,</span> <span class="n">cert_path</span><span class="p">)</span>
<span class="k">return</span> <span class="kc">False</span>
<span class="k">return</span> <span class="n">_translate_ocsp_query</span><span class="p">(</span><span class="n">cert_path</span><span class="p">,</span> <span class="n">output</span><span class="p">,</span> <span class="n">err</span><span class="p">)</span></div>
<div class="viewcode-block" id="RevocationChecker.determine_ocsp_server"><a class="viewcode-back" href="../../api/ocsp.html#certbot.ocsp.RevocationChecker.determine_ocsp_server">[docs]</a> <span class="k">def</span> <span class="nf">determine_ocsp_server</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">cert_path</span><span class="p">):</span>
<span class="sd">"""Extract the OCSP server host from a certificate.</span>
<span class="sd"> :param str cert_path: Path to the cert we're checking OCSP for</span>
<span class="sd"> :rtype tuple:</span>
<span class="sd"> :returns: (OCSP server URL or None, OCSP server host or None)</span>
<span class="sd"> """</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">url</span><span class="p">,</span> <span class="n">_err</span> <span class="o">=</span> <span class="n">util</span><span class="o">.</span><span class="n">run_script</span><span class="p">(</span>
<span class="p">[</span><span class="s2">"openssl"</span><span class="p">,</span> <span class="s2">"x509"</span><span class="p">,</span> <span class="s2">"-in"</span><span class="p">,</span> <span class="n">cert_path</span><span class="p">,</span> <span class="s2">"-noout"</span><span class="p">,</span> <span class="s2">"-ocsp_uri"</span><span class="p">],</span>
<span class="n">log</span><span class="o">=</span><span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">)</span>
<span class="k">except</span> <span class="n">errors</span><span class="o">.</span><span class="n">SubprocessError</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">"Cannot extract OCSP URI from </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">cert_path</span><span class="p">)</span>
<span class="k">return</span> <span class="kc">None</span><span class="p">,</span> <span class="kc">None</span>
<span class="n">url</span> <span class="o">=</span> <span class="n">url</span><span class="o">.</span><span class="n">rstrip</span><span class="p">()</span>
<span class="n">host</span> <span class="o">=</span> <span class="n">url</span><span class="o">.</span><span class="n">partition</span><span class="p">(</span><span class="s2">"://"</span><span class="p">)[</span><span class="mi">2</span><span class="p">]</span><span class="o">.</span><span class="n">rstrip</span><span class="p">(</span><span class="s2">"/"</span><span class="p">)</span>
<span class="k">if</span> <span class="n">host</span><span class="p">:</span>
<span class="k">return</span> <span class="n">url</span><span class="p">,</span> <span class="n">host</span>
<span class="k">else</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">"Cannot process OCSP host from URL (</span><span class="si">%s</span><span class="s2">) in cert at </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">url</span><span class="p">,</span> <span class="n">cert_path</span><span class="p">)</span>
<span class="k">return</span> <span class="kc">None</span><span class="p">,</span> <span class="kc">None</span></div></div>
<div class="viewcode-block" id="_translate_ocsp_query"><a class="viewcode-back" href="../../api/ocsp.html#certbot.ocsp._translate_ocsp_query">[docs]</a><span class="k">def</span> <span class="nf">_translate_ocsp_query</span><span class="p">(</span><span class="n">cert_path</span><span class="p">,</span> <span class="n">ocsp_output</span><span class="p">,</span> <span class="n">ocsp_errors</span><span class="p">):</span>
<span class="sd">"""Parse openssl's weird output to work out what it means."""</span>
<span class="n">states</span> <span class="o">=</span> <span class="p">(</span><span class="s2">"good"</span><span class="p">,</span> <span class="s2">"revoked"</span><span class="p">,</span> <span class="s2">"unknown"</span><span class="p">)</span>
<span class="n">patterns</span> <span class="o">=</span> <span class="p">[</span><span class="sa">r</span><span class="s2">"</span><span class="si">{0}</span><span class="s2">: (WARNING.*)?</span><span class="si">{1}</span><span class="s2">"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">cert_path</span><span class="p">,</span> <span class="n">s</span><span class="p">)</span> <span class="k">for</span> <span class="n">s</span> <span class="ow">in</span> <span class="n">states</span><span class="p">]</span>
<span class="n">good</span><span class="p">,</span> <span class="n">revoked</span><span class="p">,</span> <span class="n">unknown</span> <span class="o">=</span> <span class="p">(</span><span class="n">re</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">ocsp_output</span><span class="p">,</span> <span class="n">flags</span><span class="o">=</span><span class="n">re</span><span class="o">.</span><span class="n">DOTALL</span><span class="p">)</span> <span class="k">for</span> <span class="n">p</span> <span class="ow">in</span> <span class="n">patterns</span><span class="p">)</span>
<span class="n">warning</span> <span class="o">=</span> <span class="n">good</span><span class="o">.</span><span class="n">group</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span> <span class="k">if</span> <span class="n">good</span> <span class="k">else</span> <span class="kc">None</span>
<span class="k">if</span> <span class="p">(</span><span class="ow">not</span> <span class="s2">"Response verify OK"</span> <span class="ow">in</span> <span class="n">ocsp_errors</span><span class="p">)</span> <span class="ow">or</span> <span class="p">(</span><span class="n">good</span> <span class="ow">and</span> <span class="n">warning</span><span class="p">)</span> <span class="ow">or</span> <span class="n">unknown</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">"Revocation status for </span><span class="si">%s</span><span class="s2"> is unknown"</span><span class="p">,</span> <span class="n">cert_path</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">"Uncertain output:</span><span class="se">\n</span><span class="si">%s</span><span class="se">\n</span><span class="s2">stderr:</span><span class="se">\n</span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">ocsp_output</span><span class="p">,</span> <span class="n">ocsp_errors</span><span class="p">)</span>
<span class="k">return</span> <span class="kc">False</span>
<span class="k">elif</span> <span class="n">good</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">warning</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">False</span>
<span class="k">elif</span> <span class="n">revoked</span><span class="p">:</span>
<span class="n">warning</span> <span class="o">=</span> <span class="n">revoked</span><span class="o">.</span><span class="n">group</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="k">if</span> <span class="n">warning</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">"OCSP revocation warning: </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">warning</span><span class="p">)</span>
<span class="k">return</span> <span class="kc">True</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span><span class="s2">"Unable to properly parse OCSP output: </span><span class="si">%s</span><span class="se">\n</span><span class="s2">stderr:</span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span>
<span class="n">ocsp_output</span><span class="p">,</span> <span class="n">ocsp_errors</span><span class="p">)</span>
<span class="k">return</span> <span class="kc">False</span></div>
</pre></div>
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