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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>Authentication indicators — 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="Administration programs" href="admin_commands/index.html" /> <link rel="prev" title="HTTPS proxy configuration" href="https.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="https.html" title="HTTPS proxy configuration" accesskey="P">previous</a> | <a href="admin_commands/index.html" title="Administration programs" 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__Authentication indicators">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="authentication-indicators"> <span id="auth-indicator"></span><h1>Authentication indicators<a class="headerlink" href="#authentication-indicators" title="Permalink to this headline">¶</a></h1> <p>As of release 1.14, the KDC can be configured to annotate tickets if the client authenticated using a stronger preauthentication mechanism such as <a class="reference internal" href="pkinit.html#pkinit"><em>PKINIT</em></a> or <a class="reference internal" href="otp.html#otp-preauth"><em>OTP</em></a>. These annotations are called “authentication indicators.” Service principals can be configured to require particular authentication indicators in order to authenticate to that service. An authentication indicator value can be any string chosen by the KDC administrator; there are no pre-set values.</p> <p>To use authentication indicators with PKINIT or OTP, first configure the KDC to include an indicator when that preauthentication mechanism is used. For PKINIT, use the <strong>pkinit_indicator</strong> variable in <a class="reference internal" href="conf_files/kdc_conf.html#kdc-conf-5"><em>kdc.conf</em></a>. For OTP, use the <strong>indicator</strong> variable in the token type definition, or specify the indicators in the <strong>otp</strong> user string as described in <a class="reference internal" href="otp.html#otp-preauth"><em>OTP Preauthentication</em></a>.</p> <p>To require an indicator to be present in order to authenticate to a service principal, set the <strong>require_auth</strong> string attribute on the principal to the indicator value to be required. If you wish to allow one of several indicators to be accepted, you can specify multiple indicator values separated by spaces.</p> <p>For example, a realm could be configured to set the authentication indicator value “strong” when PKINIT is used to authenticate, using a setting in the <a class="reference internal" href="conf_files/kdc_conf.html#kdc-realms"><em>[realms]</em></a> subsection:</p> <div class="highlight-python"><div class="highlight"><pre><span class="n">pkinit_indicator</span> <span class="o">=</span> <span class="n">strong</span> </pre></div> </div> <p>A service principal could be configured to require the “strong” authentication indicator value:</p> <div class="highlight-python"><pre>$ kadmin setstr host/high.value.server require_auth strong Password for user/admin@KRBTEST.COM:</pre> </div> <p>A user who authenticates with PKINIT would be able to obtain a ticket for the service principal:</p> <div class="highlight-python"><pre>$ kinit -X X509_user_identity=FILE:/my/cert.pem,/my/key.pem user $ kvno host/high.value.server host/high.value.server@KRBTEST.COM: kvno = 1</pre> </div> <p>but a user who authenticates with a password would not:</p> <div class="highlight-python"><pre>$ kinit user Password for user@KRBTEST.COM: $ kvno host/high.value.server kvno: KDC policy rejects request while getting credentials for host/high.value.server@KRBTEST.COM</pre> </div> <p>GSSAPI server applications can inspect authentication indicators through the <a class="reference internal" href="../appdev/gssapi.html#gssapi-authind-attr"><em>auth-indicators</em></a> name attribute.</p> </div> </div> </div> </div> </div> <div class="sidebar"> <h2>On this page</h2> <ul> <li><a class="reference internal" href="#">Authentication indicators</a></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"><a class="reference internal" href="otp.html">OTP Preauthentication</a></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 current"><a class="current reference internal" href="">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" 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