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class="toctree-l1"><a class="reference internal" href="ldap-auth.html">LDAP authentication</a></li> <li class="toctree-l1"><a class="reference internal" href="vault.html">Retrieving secrets from a vault</a></li> <li class="toctree-l1 current"><a class="current reference internal" href="#">Duo two-factor authentication</a><ul> <li class="toctree-l2"><a class="reference internal" href="#how-duo-works-with-guacamole">How Duo works with Guacamole</a></li> <li class="toctree-l2"><a class="reference internal" href="#downloading-the-duo-extension">Downloading the Duo extension</a></li> <li class="toctree-l2"><a class="reference internal" href="#installing-duo-authentication">Installing Duo authentication</a><ul> <li class="toctree-l3"><a class="reference internal" href="#adding-guacamole-to-duo">Adding Guacamole to Duo</a></li> <li class="toctree-l3"><a class="reference internal" href="#configuring-guacamole-for-duo">Configuring Guacamole for Duo</a></li> <li class="toctree-l3"><a class="reference internal" href="#completing-the-installation">Completing the installation</a></li> </ul> </li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="totp-auth.html">TOTP two-factor authentication</a></li> <li class="toctree-l1"><a class="reference internal" href="header-auth.html">HTTP header authentication</a></li> <li class="toctree-l1"><a class="reference internal" href="json-auth.html">Encrypted JSON authentication</a></li> <li class="toctree-l1"><a class="reference internal" href="cas-auth.html">CAS Authentication</a></li> <li class="toctree-l1"><a class="reference internal" href="openid-auth.html">OpenID Connect Authentication</a></li> <li class="toctree-l1"><a class="reference internal" href="saml-auth.html">SAML Authentication</a></li> <li class="toctree-l1"><a class="reference internal" href="radius-auth.html">RADIUS Authentication</a></li> <li class="toctree-l1"><a class="reference internal" href="adhoc-connections.html">Ad-hoc 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href="index.html">Apache Guacamole</a> </nav> <div class="wy-nav-content"> <div class="rst-content"> <div role="navigation" aria-label="Page navigation"> <ul class="wy-breadcrumbs"> <li><a href="index.html" class="icon icon-home" aria-label="Home"></a></li> <li class="breadcrumb-item active">Duo two-factor authentication</li> <li class="wy-breadcrumbs-aside"> <a href="_sources/duo-auth.md.txt" rel="nofollow"> View page source</a> </li> </ul> <hr/> </div> <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article"> <div itemprop="articleBody"> <section id="duo-two-factor-authentication"> <h1>Duo two-factor authentication<a class="headerlink" href="#duo-two-factor-authentication" title="Permalink to this heading"></a></h1> <p>Guacamole supports Duo as a second authentication factor, layered on top of any other authentication extension, including those available from the main project website. The Duo authentication extension allows users to be additionally verified against the Duo service before the authentication process is allowed to succeed.</p> <div class="admonition important"> <p class="admonition-title">Important</p> <p>This chapter involves modifying the contents of <code class="docutils literal notranslate"><span class="pre">GUACAMOLE_HOME</span></code> - the Guacamole configuration directory. If you are unsure where <code class="docutils literal notranslate"><span class="pre">GUACAMOLE_HOME</span></code> is located on your system, please consult <a class="reference internal" href="configuring-guacamole.html"><span class="doc std std-doc">Configuring Guacamole</span></a> before proceeding.</p> </div> <section id="how-duo-works-with-guacamole"> <span id="duo-architecture"></span><h2>How Duo works with Guacamole<a class="headerlink" href="#how-duo-works-with-guacamole" title="Permalink to this heading"></a></h2> <p>Guacamole provides support for Duo as a second authentication factor. To make use of the Duo authentication extension, some other authentication mechanism will need be configured, as well. When a user attempts to log into Guacamole, other installed authentication methods will be queried first:</p> <p><img alt="" src="_images/duo-auth-factor-1.png" /></p> <p>Only after authentication has succeeded with one of those methods will Guacamole reach out to Duo to obtain additional verification of user identity:</p> <p><img alt="" src="_images/duo-auth-factor-2.png" /></p> <p>If both the initial authentication attempt and verification through Duo succeed, the user will be allowed in. If either mechanism fails, access to Guacamole is denied.</p> </section> <section id="downloading-the-duo-extension"> <span id="duo-downloading"></span><h2>Downloading the Duo extension<a class="headerlink" href="#downloading-the-duo-extension" title="Permalink to this heading"></a></h2> <p>The Duo authentication extension is available separately from the main <code class="docutils literal notranslate"><span class="pre">guacamole.war</span></code>. The link for this and all other officially-supported and compatible extensions for a particular version of Guacamole are provided on the release notes for that version. You can find the release notes for current versions of Guacamole here: http://guacamole.apache.org/releases/.</p> <p>The Duo authentication extension is packaged as a <code class="docutils literal notranslate"><span class="pre">.tar.gz</span></code> file containing only the extension itself, <code class="docutils literal notranslate"><span class="pre">guacamole-auth-duo-1.5.3.jar</span></code>, which must ultimately be placed in <code class="docutils literal notranslate"><span class="pre">GUACAMOLE_HOME/extensions</span></code>.</p> </section> <section id="installing-duo-authentication"> <span id="installing-duo-auth"></span><h2>Installing Duo authentication<a class="headerlink" href="#installing-duo-authentication" title="Permalink to this heading"></a></h2> <p>Guacamole extensions are self-contained <code class="docutils literal notranslate"><span class="pre">.jar</span></code> files which are located within the <code class="docutils literal notranslate"><span class="pre">GUACAMOLE_HOME/extensions</span></code> directory. To install the Duo authentication extension, you must:</p> <ol class="arabic simple"> <li><p>Create the <code class="docutils literal notranslate"><span class="pre">GUACAMOLE_HOME/extensions</span></code> directory, if it does not already exist.</p></li> <li><p>Copy <code class="docutils literal notranslate"><span class="pre">guacamole-auth-duo-1.5.3.jar</span></code> within <code class="docutils literal notranslate"><span class="pre">GUACAMOLE_HOME/extensions</span></code>.</p></li> <li><p>Configure Guacamole to use Duo authentication, as described below.</p></li> </ol> <div class="admonition important"> <p class="admonition-title">Important</p> <p>You will need to restart Guacamole by restarting your servlet container in order to complete the installation. Doing this will disconnect all active users, so be sure that it is safe to do so prior to attempting installation. If you do not configure the Duo authentication properly, Guacamole will not start up again until the configuration is fixed.</p> </div> <section id="adding-guacamole-to-duo"> <h3>Adding Guacamole to Duo<a class="headerlink" href="#adding-guacamole-to-duo" title="Permalink to this heading"></a></h3> <p>Duo does not provide a specific integration option for Guacamole, but Guacamole’s Duo extension uses Duo’s generic authentication API which they refer to as the “Web SDK”. To use Guacamole with Duo, you will need to add it as a new “Web SDK” application from within the “Applications” tab of the admin panel of your Duo account:</p> <p><img alt="" src="_images/duo-add-guacamole.png" /></p> <p>Within the settings of the newly-added application, rename the application to something more representative than “Web SDK”. This application name is what will be presented to your users when they are prompted by Duo for additional authentication:</p> <p><img alt="" src="_images/duo-rename-guacamole.png" /></p> <p>Once you’ve finished adding Guacamole as an “Web SDK” application, the configuration information required to configure Guacamole is listed within the application’s “Details” section. You will need to copy the integration key, secret key, and API hostname - they will later be specified within <code class="docutils literal notranslate"><span class="pre">guacamole.properties</span></code>:</p> <p><img alt="" src="_images/duo-copy-details.png" /></p> </section> <section id="configuring-guacamole-for-duo"> <span id="guac-duo-config"></span><h3>Configuring Guacamole for Duo<a class="headerlink" href="#configuring-guacamole-for-duo" title="Permalink to this heading"></a></h3> <p>The application-specific configuration information retrieved from Duo must be added to <code class="docutils literal notranslate"><span class="pre">guacamole.properties</span></code> to describe how Guacamole should connect to the Duo service:</p> <dl class="simple myst"> <dt>duo-api-hostname</dt><dd><p>The hostname of the Duo API endpoint to be used to verify user identities. This will usually be in the form <code class="docutils literal notranslate"><span class="pre">api-XXXXXXXX.duosecurity.com</span></code>, where “XXXXXXXX” is some arbitrary alphanumeric value assigned by Duo. This value will have been generated by Duo when you added Guacamole as an “Web SDK” application, and can be found within the application details in the “API hostname” field. <em>This value is required.</em></p> </dd> <dt>duo-integration-key</dt><dd><p>The integration key provided for Guacamole by Duo. This value will have been generated by Duo when you added Guacamole as an “Web SDK” application, and can be found within the application details in the “Integration key” field. <em>This value is required and must be EXACTLY 20 characters.</em></p> </dd> <dt>duo-secret-key</dt><dd><p>The secret key provided for Guacamole by Duo. This value will have been generated by Duo when you added Guacamole as an “Web SDK” application, and can be found within the application details in the “Secret key” field. <em>This value is required and must be EXACTLY 40 characters.</em></p> </dd> </dl> <p>In addition to the above, <em>you must also manually generate an “application key”</em>. The application key is required by Duo’s authentication API, but is not provided by Duo. It is an arbitrary value meant to be unique to each deployment of an application using their API.</p> <dl class="simple myst"> <dt>duo-application-key</dt><dd><p>An arbitrary, random key which you manually generated for Guacamole. <em>This value is required and must be AT LEAST 40 characters.</em></p> </dd> </dl> <p>The application key can be generated with any method as long as it is sufficiently random. There exist utilities which will do this for you, like <code class="docutils literal notranslate"><span class="pre">pwgen</span></code>:</p> <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>pwgen<span class="w"> </span><span class="m">40</span><span class="w"> </span><span class="m">1</span> <span class="go">em1io4zievohneeseiwah0zie2raQuoo2ci5oBoo</span> <span class="gp">$</span> </pre></div> </div> <p>Alternatively, one quick and fairly portable way to do this is to use the <code class="docutils literal notranslate"><span class="pre">dd</span></code> utility to copy random bytes from the secure random device <code class="docutils literal notranslate"><span class="pre">/dev/random</span></code>, sending the data through a cryptographic hash tool with a sufficiently-long result, like <code class="docutils literal notranslate"><span class="pre">sha256sum</span></code>:</p> <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>dd<span class="w"> </span><span class="k">if</span><span class="o">=</span>/dev/random<span class="w"> </span><span class="nv">count</span><span class="o">=</span><span class="m">1</span><span class="w"> </span><span class="p">|</span><span class="w"> </span>sha256sum <span class="go">5d16d6bb86da73e7d1abd3286b21dcf3b3e707532e64ceebc7a008350d0d485d -</span> <span class="gp">$</span> </pre></div> </div> </section> <section id="completing-the-installation"> <span id="completing-duo-install"></span><h3>Completing the installation<a class="headerlink" href="#completing-the-installation" title="Permalink to this heading"></a></h3> <p>Guacamole will only reread <code class="docutils literal notranslate"><span class="pre">guacamole.properties</span></code> and load newly-installed extensions during startup, so your servlet container will need to be restarted before Duo authentication will take effect. Restart your servlet container and give the new authentication a try.</p> <div class="admonition important"> <p class="admonition-title">Important</p> <p>You only need to restart your servlet container. <em>You do not need to restart guacd</em>.</p> <p>guacd is completely independent of the web application and does not deal with <code class="docutils literal notranslate"><span class="pre">guacamole.properties</span></code> or the authentication system in any way. Since you are already restarting the servlet container, restarting guacd as well technically won’t hurt anything, but doing so is completely pointless.</p> </div> <p>If Guacamole does not come back online after restarting your servlet container, check the logs. Problems in the configuration of the Duo extension may prevent Guacamole from starting up, and any such errors will be recorded in the logs of your servlet container.</p> </section> </section> </section> </div> </div> <footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer"> <a href="vault.html" class="btn btn-neutral float-left" title="Retrieving secrets from a vault" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left" aria-hidden="true"></span> Previous</a> <a href="totp-auth.html" class="btn btn-neutral float-right" title="TOTP two-factor authentication" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right" aria-hidden="true"></span></a> </div> <hr/> <div role="contentinfo"> <p>Copyright © 2023 <a href="http://www.apache.org/">The Apache Software Foundation</a>, Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>. 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