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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>OTP Preauthentication — MIT Kerberos Documentation</title> <link rel="stylesheet" href="../_static/agogo.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <link rel="stylesheet" href="../_static/kerb.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '1.15.1', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <link rel="author" title="About these documents" href="../about.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="top" title="MIT Kerberos Documentation" href="../index.html" /> <link rel="up" title="For administrators" href="index.html" /> <link rel="next" title="Principal names and DNS" href="princ_dns.html" /> <link rel="prev" title="PKINIT configuration" href="pkinit.html" /> </head> <body> <div class="header-wrapper"> <div class="header"> <h1><a href="../index.html">MIT Kerberos Documentation</a></h1> <div class="rel"> <a href="../index.html" title="Full Table of Contents" accesskey="C">Contents</a> | <a href="pkinit.html" title="PKINIT configuration" accesskey="P">previous</a> | <a href="princ_dns.html" title="Principal names and DNS" accesskey="N">next</a> | <a href="../genindex.html" title="General Index" accesskey="I">index</a> | <a href="../search.html" title="Enter search criteria" accesskey="S">Search</a> | <a href="mailto:krb5-bugs@mit.edu?subject=Documentation__OTP Preauthentication">feedback</a> </div> </div> </div> <div class="content-wrapper"> <div class="content"> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="otp-preauthentication"> <span id="otp-preauth"></span><h1>OTP Preauthentication<a class="headerlink" href="#otp-preauthentication" title="Permalink to this headline">¶</a></h1> <p>OTP is a preauthentication mechanism for Kerberos 5 which uses One Time Passwords (OTP) to authenticate the client to the KDC. The OTP is passed to the KDC over an encrypted FAST channel in clear-text. The KDC uses the password along with per-user configuration to proxy the request to a third-party RADIUS system. This enables out-of-the-box compatibility with a large number of already widely deployed proprietary systems.</p> <p>Additionally, our implementation of the OTP system allows for the passing of RADIUS requests over a UNIX domain stream socket. This permits the use of a local companion daemon which can handle the details of authentication.</p> <div class="section" id="defining-token-types"> <h2>Defining token types<a class="headerlink" href="#defining-token-types" title="Permalink to this headline">¶</a></h2> <p>Token types are defined in either <a class="reference internal" href="conf_files/krb5_conf.html#krb5-conf-5"><em>krb5.conf</em></a> or <a class="reference internal" href="conf_files/kdc_conf.html#kdc-conf-5"><em>kdc.conf</em></a> according to the following format:</p> <div class="highlight-python"><pre>[otp] <name> = { server = <host:port or filename> (default: see below) secret = <filename> timeout = <integer> (default: 5 [seconds]) retries = <integer> (default: 3) strip_realm = <boolean> (default: true) indicator = <string> (default: none) }</pre> </div> <p>If the server field begins with ‘/’, it will be interpreted as a UNIX socket. Otherwise, it is assumed to be in the format host:port. When a UNIX domain socket is specified, the secret field is optional and an empty secret is used by default. If the server field is not specified, it defaults to <tt class="docutils literal"><span class="pre">/var/run</span></tt><tt class="docutils literal"><span class="pre">/krb5kdc</span></tt><tt class="docutils literal"><span class="pre">/<name>.socket</span></tt>.</p> <p>When forwarding the request over RADIUS, by default the principal is used in the User-Name attribute of the RADIUS packet. The strip_realm parameter controls whether the principal is forwarded with or without the realm portion.</p> <p>If an indicator field is present, tickets issued using this token type will be annotated with the specified authentication indicator (see <a class="reference internal" href="auth_indicator.html#auth-indicator"><em>Authentication indicators</em></a>). This key may be specified multiple times to add multiple indicators.</p> </div> <div class="section" id="the-default-token-type"> <h2>The default token type<a class="headerlink" href="#the-default-token-type" title="Permalink to this headline">¶</a></h2> <p>A default token type is used internally when no token type is specified for a given user. It is defined as follows:</p> <div class="highlight-python"><pre>[otp] DEFAULT = { strip_realm = false }</pre> </div> <p>The administrator may override the internal <tt class="docutils literal"><span class="pre">DEFAULT</span></tt> token type simply by defining a configuration with the same name.</p> </div> <div class="section" id="token-instance-configuration"> <h2>Token instance configuration<a class="headerlink" href="#token-instance-configuration" title="Permalink to this headline">¶</a></h2> <p>To enable OTP for a client principal, the administrator must define the <strong>otp</strong> string attribute for that principal. (See <a class="reference internal" href="admin_commands/kadmin_local.html#set-string"><em>set_string</em></a>.) The <strong>otp</strong> user string is a JSON string of the format:</p> <div class="highlight-xml"><div class="highlight"><pre>[{ "type": <span class="nt"><string></span>, "username": <span class="nt"><string></span>, "indicators": [<span class="nt"><string></span>, ...] }, ...] </pre></div> </div> <p>This is an array of token objects. Both fields of token objects are optional. The <strong>type</strong> field names the token type of this token; if not specified, it defaults to <tt class="docutils literal"><span class="pre">DEFAULT</span></tt>. The <strong>username</strong> field specifies the value to be sent in the User-Name RADIUS attribute. If not specified, the principal name is sent, with or without realm as defined in the token type. The <strong>indicators</strong> field specifies a list of authentication indicators to annotate tickets with, overriding any indicators specified in the token type.</p> <p>For ease of configuration, an empty array (<tt class="docutils literal"><span class="pre">[]</span></tt>) is treated as equivalent to one DEFAULT token (<tt class="docutils literal"><span class="pre">[{}]</span></tt>).</p> </div> <div class="section" id="other-considerations"> <h2>Other considerations<a class="headerlink" href="#other-considerations" title="Permalink to this headline">¶</a></h2> <ol class="arabic simple"> <li>FAST is required for OTP to work.</li> </ol> </div> </div> </div> </div> </div> </div> <div class="sidebar"> <h2>On this page</h2> <ul> <li><a class="reference internal" href="#">OTP Preauthentication</a><ul> <li><a class="reference internal" href="#defining-token-types">Defining token types</a></li> <li><a class="reference internal" href="#the-default-token-type">The default token type</a></li> <li><a class="reference internal" href="#token-instance-configuration">Token instance configuration</a></li> <li><a class="reference internal" href="#other-considerations">Other considerations</a></li> </ul> </li> </ul> <br/> <h2>Table of contents</h2> <ul class="current"> <li class="toctree-l1"><a class="reference internal" href="../user/index.html">For users</a></li> <li class="toctree-l1 current"><a class="reference internal" href="index.html">For administrators</a><ul class="current"> <li class="toctree-l2"><a class="reference internal" href="install.html">Installation guide</a></li> <li class="toctree-l2"><a class="reference internal" href="conf_files/index.html">Configuration Files</a></li> <li class="toctree-l2"><a class="reference internal" href="realm_config.html">Realm configuration decisions</a></li> <li class="toctree-l2"><a class="reference internal" href="database.html">Database administration</a></li> <li class="toctree-l2"><a class="reference internal" href="lockout.html">Account lockout</a></li> <li class="toctree-l2"><a class="reference internal" href="conf_ldap.html">Configuring Kerberos with OpenLDAP back-end</a></li> <li class="toctree-l2"><a class="reference internal" href="appl_servers.html">Application servers</a></li> <li class="toctree-l2"><a class="reference internal" href="host_config.html">Host configuration</a></li> <li class="toctree-l2"><a class="reference internal" href="backup_host.html">Backups of secure hosts</a></li> <li class="toctree-l2"><a class="reference internal" href="pkinit.html">PKINIT configuration</a></li> <li class="toctree-l2 current"><a class="current reference internal" href="">OTP Preauthentication</a><ul class="simple"> </ul> </li> <li class="toctree-l2"><a class="reference internal" href="princ_dns.html">Principal names and DNS</a></li> <li class="toctree-l2"><a class="reference internal" href="enctypes.html">Encryption types</a></li> <li class="toctree-l2"><a class="reference internal" href="https.html">HTTPS proxy configuration</a></li> <li class="toctree-l2"><a class="reference internal" href="auth_indicator.html">Authentication indicators</a></li> <li class="toctree-l2"><a class="reference internal" href="admin_commands/index.html">Administration programs</a></li> <li class="toctree-l2"><a class="reference internal" href="../mitK5defaults.html">MIT Kerberos defaults</a></li> <li class="toctree-l2"><a class="reference internal" href="env_variables.html">Environment variables</a></li> <li class="toctree-l2"><a class="reference internal" href="troubleshoot.html">Troubleshooting</a></li> <li class="toctree-l2"><a class="reference internal" href="advanced/index.html">Advanced topics</a></li> <li class="toctree-l2"><a class="reference internal" href="various_envs.html">Various links</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="../appdev/index.html">For application developers</a></li> <li class="toctree-l1"><a class="reference internal" href="../plugindev/index.html">For plugin module developers</a></li> <li class="toctree-l1"><a class="reference internal" href="../build/index.html">Building Kerberos V5</a></li> <li class="toctree-l1"><a class="reference internal" href="../basic/index.html">Kerberos V5 concepts</a></li> <li class="toctree-l1"><a class="reference internal" href="../formats/index.html">Protocols and file formats</a></li> <li class="toctree-l1"><a class="reference internal" href="../mitK5features.html">MIT Kerberos features</a></li> <li class="toctree-l1"><a class="reference internal" href="../build_this.html">How to build this documentation from the source</a></li> <li class="toctree-l1"><a class="reference internal" href="../about.html">Contributing to the MIT Kerberos Documentation</a></li> <li class="toctree-l1"><a class="reference internal" href="../resources.html">Resources</a></li> </ul> <br/> <h4><a href="../index.html">Full Table of Contents</a></h4> <h4>Search</h4> <form class="search" 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