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<div class="section" id="kadm5-hook-interface-kadm5-hook">
<span id="kadm5-hook-plugin"></span><h1>KADM5 hook interface (kadm5_hook)<a class="headerlink" href="#kadm5-hook-interface-kadm5-hook" title="Permalink to this headline">ΒΆ</a></h1>
<p>The kadm5_hook interface allows modules to perform actions when
changes are made to the Kerberos database through <a class="reference internal" href="../admin/admin_commands/kadmin_local.html#kadmin-1"><em>kadmin</em></a>.
For a detailed description of the kadm5_hook interface, see the header
file <tt class="docutils literal"><span class="pre"><krb5/kadm5_hook_plugin.h></span></tt>.</p>
<p>The kadm5_hook interface has four primary methods: <strong>chpass</strong>,
<strong>create</strong>, <strong>modify</strong>, and <strong>remove</strong>. Each of these methods is
called twice when the corresponding administrative action takes place,
once before the action is committed and once afterwards. A module can
prevent the action from taking place by returning an error code during
the pre-commit stage.</p>
<p>A module can create and destroy per-process state objects by
implementing the <strong>init</strong> and <strong>fini</strong> methods. State objects have
the type kadm5_hook_modinfo, which is an abstract pointer type. A
module should typically cast this to an internal type for the state
object.</p>
<p>Because the kadm5_hook interface is tied closely to the kadmin
interface (which is explicitly unstable), it may not remain as stable
across versions as other public pluggable interfaces.</p>
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