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<div class="section" id="pkinit-certificate-authorization-interface-certauth">
<span id="certauth-plugin"></span><h1>PKINIT certificate authorization interface (certauth)<a class="headerlink" href="#pkinit-certificate-authorization-interface-certauth" title="Permalink to this headline">¶</a></h1>
<p>The certauth interface was first introduced in release 1.16. It
allows customization of the X.509 certificate attribute requirements
placed on certificates used by PKINIT enabled clients. For a detailed
description of the certauth interface, see the header file
<tt class="docutils literal"><span class="pre"><krb5/certauth_plugin.h></span></tt></p>
<p>A certauth module implements the <strong>authorize</strong> method to determine
whether a client’s certificate is authorized to authenticate a client
principal. <strong>authorize</strong> receives the DER-encoded certificate, the
requested client principal, and a pointer to the client’s
krb5_db_entry (for modules that link against libkdb5). It returns the
authorization status and optionally outputs a list of authentication
indicator strings to be added to the ticket. A module must use its
own internal or library-provided ASN.1 certificate decoder.</p>
<p>A module can optionally create and destroy module data with the
<strong>init</strong> and <strong>fini</strong> methods. Module data objects last for the
lifetime of the KDC process.</p>
<p>If a module allocates and returns a list of authentication indicators
from <strong>authorize</strong>, it must also implement the <strong>free_ind</strong> method
to free the list.</p>
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