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<h1><a href="../index.html">MIT Kerberos Documentation</a></h1>
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<div class="section" id="host-configuration">
<h1>Host configuration<a class="headerlink" href="#host-configuration" title="Permalink to this headline">¶</a></h1>
<p>All hosts running Kerberos software, whether they are clients,
application servers, or KDCs, can be configured using
<a class="reference internal" href="conf_files/krb5_conf.html#krb5-conf-5"><em>krb5.conf</em></a>. Here we describe some of the behavior changes
you might want to make.</p>
<div class="section" id="plugin-module-configuration">
<span id="plugin-config"></span><h2>Plugin module configuration<a class="headerlink" href="#plugin-module-configuration" title="Permalink to this headline">¶</a></h2>
<p>Many aspects of Kerberos behavior, such as client preauthentication
and KDC service location, can be modified through the use of plugin
modules. For most of these behaviors, you can use the <a class="reference internal" href="conf_files/krb5_conf.html#plugins"><em>[plugins]</em></a>
section of krb5.conf to register third-party modules, and to switch
off registered or built-in modules.</p>
<p>A plugin module takes the form of a Unix shared object
(<tt class="docutils literal"><span class="pre">modname.so</span></tt>) or Windows DLL (<tt class="docutils literal"><span class="pre">modname.dll</span></tt>). If you have
installed a third-party plugin module and want to register it, you do
so using the <strong>module</strong> relation in the appropriate subsection of the
[plugins] section. The value for <strong>module</strong> must give the module name
and the path to the module, separated by a colon. The module name
will often be the same as the shared object’s name, but in unusual
cases (such as a shared object which implements multiple modules for
the same interface) it might not be. For example, to register a
client preauthentication module named <tt class="docutils literal"><span class="pre">mypreauth</span></tt> installed at
<tt class="docutils literal"><span class="pre">/path/to/mypreauth.so</span></tt>, you could write:</p>
<div class="highlight-python"><div class="highlight"><pre>[plugins]
clpreauth = {
module = mypreauth:/path/to/mypreauth.so
}
</pre></div>
</div>
<p>Many of the pluggable behaviors in MIT krb5 contain built-in modules
which can be switched off. You can disable a built-in module (or one
you have registered) using the <strong>disable</strong> directive in the
appropriate subsection of the [plugins] section. For example, to
disable the use of .k5identity files to select credential caches, you
could write:</p>
<div class="highlight-python"><div class="highlight"><pre>[plugins]
ccselect = {
disable = k5identity
}
</pre></div>
</div>
<p>If you want to disable multiple modules, specify the <strong>disable</strong>
directive multiple times, giving one module to disable each time.</p>
<p>Alternatively, you can explicitly specify which modules you want to be
enabled for that behavior using the <strong>enable_only</strong> directive. For
example, to make <a class="reference internal" href="admin_commands/kadmind.html#kadmind-8"><em>kadmind</em></a> check password quality using only a
module you have registered, and no other mechanism, you could write:</p>
<div class="highlight-python"><div class="highlight"><pre>[plugins]
pwqual = {
module = mymodule:/path/to/mymodule.so
enable_only = mymodule
}
</pre></div>
</div>
<p>Again, if you want to specify multiple modules, specify the
<strong>enable_only</strong> directive multiple times, giving one module to enable
each time.</p>
<p>Some Kerberos interfaces use different mechanisms to register plugin
modules.</p>
<div class="section" id="kdc-location-modules">
<h3>KDC location modules<a class="headerlink" href="#kdc-location-modules" title="Permalink to this headline">¶</a></h3>
<p>For historical reasons, modules to control how KDC servers are located
are registered simply by placing the shared object or DLL into the
“libkrb5” subdirectory of the krb5 plugin directory, which defaults to
<tt class="docutils literal"><span class="pre">/usr/lib</span></tt><tt class="docutils literal"><span class="pre">/krb5/plugins</span></tt>. For example, Samba’s winbind krb5
locator plugin would be registered by placing its shared object in
<tt class="docutils literal"><span class="pre">/usr/lib</span></tt><tt class="docutils literal"><span class="pre">/krb5/plugins/libkrb5/winbind_krb5_locator.so</span></tt>.</p>
</div>
<div class="section" id="gssapi-mechanism-modules">
<span id="gssapi-plugin-config"></span><h3>GSSAPI mechanism modules<a class="headerlink" href="#gssapi-mechanism-modules" title="Permalink to this headline">¶</a></h3>
<p>GSSAPI mechanism module are registered using the file
<tt class="docutils literal"><span class="pre">/etc/gss/mech</span></tt>. Each line in this file has the form:</p>
<div class="highlight-python"><div class="highlight"><pre>oid pathname [options] <type>
</pre></div>
</div>
<p>Only the oid and pathname are required. <em>oid</em> is the object
identifier of the GSSAPI mechanism to be registered. <em>pathname</em> is a
path to the module shared object or DLL. <em>options</em> (if present) are
options provided to the plugin module, surrounded in square brackets.
<em>type</em> (if present) can be used to indicate a special type of module.
Currently the only special module type is “interposer”, for a module
designed to intercept calls to other mechanisms.</p>
</div>
<div class="section" id="configuration-profile-modules">
<span id="profile-plugin-config"></span><h3>Configuration profile modules<a class="headerlink" href="#configuration-profile-modules" title="Permalink to this headline">¶</a></h3>
<p>A configuration profile module replaces the information source for
<a class="reference internal" href="conf_files/krb5_conf.html#krb5-conf-5"><em>krb5.conf</em></a> itself. To use a profile module, begin krb5.conf
with the line:</p>
<div class="highlight-python"><div class="highlight"><pre>module PATHNAME:STRING
</pre></div>
</div>
<p>where <em>PATHNAME</em> is a path to the module shared object or DLL, and
<em>STRING</em> is a string to provide to the module. The module will then
take over, and the rest of krb5.conf will be ignored.</p>
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<h2>On this page</h2>
<ul>
<li><a class="reference internal" href="#">Host configuration</a><ul>
<li><a class="reference internal" href="#plugin-module-configuration">Plugin module configuration</a><ul>
<li><a class="reference internal" href="#kdc-location-modules">KDC location modules</a></li>
<li><a class="reference internal" href="#gssapi-mechanism-modules">GSSAPI mechanism modules</a></li>
<li><a class="reference internal" href="#configuration-profile-modules">Configuration profile modules</a></li>
</ul>
</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 current"><a class="current reference internal" href="">Host configuration</a><ul class="simple">
</ul>
</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="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>
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