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  <div class="section" id="krb5-pac-verify-verify-a-pac">
<h1>krb5_pac_verify -  Verify a PAC.<a class="headerlink" href="#krb5-pac-verify-verify-a-pac" title="Permalink to this headline"></a></h1>
<dl class="function">
<dt id="c.krb5_pac_verify">
<a class="reference internal" href="../types/krb5_error_code.html#c.krb5_error_code" title="krb5_error_code">krb5_error_code</a> <tt class="descname">krb5_pac_verify</tt><big>(</big><a class="reference internal" href="../types/krb5_context.html#c.krb5_context" title="krb5_context">krb5_context</a><em>&nbsp;context</em>, const <a class="reference internal" href="../types/krb5_pac.html#c.krb5_pac" title="krb5_pac">krb5_pac</a><em>&nbsp;pac</em>, <a class="reference internal" href="../types/krb5_timestamp.html#c.krb5_timestamp" title="krb5_timestamp">krb5_timestamp</a><em>&nbsp;authtime</em>, <a class="reference internal" href="../types/krb5_const_principal.html#c.krb5_const_principal" title="krb5_const_principal">krb5_const_principal</a><em>&nbsp;principal</em>, const <a class="reference internal" href="../types/krb5_keyblock.html#c.krb5_keyblock" title="krb5_keyblock">krb5_keyblock</a> *<em>&nbsp;server</em>, const <a class="reference internal" href="../types/krb5_keyblock.html#c.krb5_keyblock" title="krb5_keyblock">krb5_keyblock</a> *<em>&nbsp;privsvr</em><big>)</big><a class="headerlink" href="#c.krb5_pac_verify" title="Permalink to this definition"></a></dt>
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<tr class="field-odd field"><th class="field-name">param:</th><td class="field-body"><p class="first"><strong>[in]</strong> <strong>context</strong> - Library context</p>
<p><strong>[in]</strong> <strong>pac</strong> - PAC handle</p>
<p><strong>[in]</strong> <strong>authtime</strong> - Expected timestamp</p>
<p><strong>[in]</strong> <strong>principal</strong> - Expected principal name (or NULL)</p>
<p><strong>[in]</strong> <strong>server</strong> - Key to validate server checksum (or NULL)</p>
<p class="last"><strong>[in]</strong> <strong>privsvr</strong> - Key to validate KDC checksum (or NULL)</p>
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<tr class="field-odd field"><th class="field-name">retval:</th><td class="field-body"><ul class="first last simple">
<li>0   Success; otherwise - Kerberos error codes</li>
</ul>
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</table>
<p>This function validates <em>pac</em> against the supplied <em>server</em> , <em>privsvr</em> , <em>principal</em> and <em>authtime</em> . If <em>principal</em> is NULL, the principal and authtime are not verified. If <em>server</em> or <em>privsvr</em> is NULL, the corresponding checksum is not verified.</p>
<p>If successful, <em>pac</em> is marked as verified.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">A checksum mismatch can occur if the PAC was copied from a cross-realm TGT by an ignorant KDC; also macOS Server Open Directory (as of 10.6) generates PACs with no server checksum at all. One should consider not failing the whole authentication because of this reason, but, instead, treating the ticket as if it did not contain a PAC or marking the PAC information as non-verified.</p>
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