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<div class="section" id="credential-cache-selection-interface-ccselect">
<span id="ccselect-plugin"></span><h1>Credential cache selection interface (ccselect)<a class="headerlink" href="#credential-cache-selection-interface-ccselect" title="Permalink to this headline">¶</a></h1>
<p>The ccselect interface allows modules to control how credential caches
are chosen when a GSSAPI client contacts a service. For a detailed
description of the ccselect interface, see the header file
<tt class="docutils literal"><span class="pre"><krb5/ccselect_plugin.h></span></tt>.</p>
<p>The primary ccselect method is <strong>choose</strong>, which accepts a server
principal as input and returns a ccache and/or principal name as
output. A module can use the krb5_cccol APIs to iterate over the
cache collection in order to find an appropriate ccache to use.</p>
<p>A module can create and destroy per-library-context state objects by
implementing the <strong>init</strong> and <strong>fini</strong> methods. State objects have
the type krb5_ccselect_moddata, which is an abstract pointer type. A
module should typically cast this to an internal type for the state
object.</p>
<p>A module can have one of two priorities, “authoritative” or
“heuristic”. Results from authoritative modules, if any are
available, will take priority over results from heuristic modules. A
module communicates its priority as a result of the <strong>init</strong> method.</p>
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