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<h1 id="develop-certificate-authenticator--page-root">Certificate authenticator<a class="headerlink" href="#develop-certificate-authenticator--page-root" title="Permalink to this headline">#</a></h1>
<p>Trino supports TLS-based authentication with X509 certificates via a custom
certificate authenticator that extracts the principal from a client certificate.</p>

<h2 id="implementation">Implementation<a class="headerlink" href="#implementation" title="Permalink to this headline">#</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">CertificateAuthenticatorFactory</span></code> is responsible for creating a
<code class="docutils literal notranslate"><span class="pre">CertificateAuthenticator</span></code> instance. It also defines the name of this
authenticator which is used by the administrator in a Trino configuration.</p>
<p><code class="docutils literal notranslate"><span class="pre">CertificateAuthenticator</span></code> contains a single method, <code class="docutils literal notranslate"><span class="pre">authenticate()</span></code>,
which authenticates the client certificate and returns a <code class="docutils literal notranslate"><span class="pre">Principal</span></code>, which is then
authorized by the <a class="reference internal" href="system-access-control.html"><span class="doc">System access control</span></a>.</p>
<p>The implementation of <code class="docutils literal notranslate"><span class="pre">CertificateAuthenticatorFactory</span></code> must be wrapped
as a plugin and installed on the Trino cluster.</p>


<h2 id="configuration">Configuration<a class="headerlink" href="#configuration" title="Permalink to this headline">#</a></h2>
<p>After a plugin that implements <code class="docutils literal notranslate"><span class="pre">CertificateAuthenticatorFactory</span></code> has been
installed on the coordinator, it is configured using an
<code class="docutils literal notranslate"><span class="pre">etc/certificate-authenticator.properties</span></code> file. All of the
properties other than <code class="docutils literal notranslate"><span class="pre">certificate-authenticator.name</span></code> are specific to the
<code class="docutils literal notranslate"><span class="pre">CertificateAuthenticatorFactory</span></code> implementation.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">certificate-authenticator.name</span></code> property is used by Trino to find a
registered <code class="docutils literal notranslate"><span class="pre">CertificateAuthenticatorFactory</span></code> based on the name returned by
<code class="docutils literal notranslate"><span class="pre">CertificateAuthenticatorFactory.getName()</span></code>. The remaining properties are
passed as a map to <code class="docutils literal notranslate"><span class="pre">CertificateAuthenticatorFactory.create()</span></code>.</p>
<p>Example configuration file:</p>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>certificate-authenticator.name=custom
custom-property1=custom-value1
custom-property2=custom-value2
</pre></div>
</div>
<p>Additionally, the coordinator must be configured to use certificate authentication
and have HTTPS enabled (or HTTPS forwarding enabled).</p>


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