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<title>krb5_pac_verify - Verify a PAC. — MIT Kerberos Documentation</title>
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<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="c function">
<dt class="sig sig-object c" id="c.krb5_pac_verify">
<a class="reference internal" href="../types/krb5_error_code.html#c.krb5_error_code" title="krb5_error_code"><span class="n"><span class="pre">krb5_error_code</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">krb5_pac_verify</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="../types/krb5_context.html#c.krb5_context" title="krb5_context"><span class="n"><span class="pre">krb5_context</span></span></a><span class="w"> </span><span class="n"><span class="pre">context</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><a class="reference internal" href="../types/krb5_pac.html#c.krb5_pac" title="krb5_pac"><span class="n"><span class="pre">krb5_pac</span></span></a><span class="w"> </span><span class="n"><span class="pre">pac</span></span>, <a class="reference internal" href="../types/krb5_timestamp.html#c.krb5_timestamp" title="krb5_timestamp"><span class="n"><span class="pre">krb5_timestamp</span></span></a><span class="w"> </span><span class="n"><span class="pre">authtime</span></span>, <a class="reference internal" href="../types/krb5_const_principal.html#c.krb5_const_principal" title="krb5_const_principal"><span class="n"><span class="pre">krb5_const_principal</span></span></a><span class="w"> </span><span class="n"><span class="pre">principal</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><a class="reference internal" href="../types/krb5_keyblock.html#c.krb5_keyblock" title="krb5_keyblock"><span class="n"><span class="pre">krb5_keyblock</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">server</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><a class="reference internal" href="../types/krb5_keyblock.html#c.krb5_keyblock" title="krb5_keyblock"><span class="n"><span class="pre">krb5_keyblock</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">privsvr</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.krb5_pac_verify" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="field-list">
<dt class="field-odd">param</dt>
<dd class="field-odd"><p><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><strong>[in]</strong> <strong>privsvr</strong> - Key to validate KDC checksum (or NULL)</p>
</dd>
</dl>
<dl class="field-list simple">
<dt class="field-odd">retval</dt>
<dd class="field-odd"><ul class="simple">
<li><p>0 Success; otherwise - Kerberos error codes</p></li>
</ul>
</dd>
</dl>
<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="admonition-title">Note</p>
<p>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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<li><a class="reference internal" href="#">krb5_pac_verify - Verify a PAC.</a></li>
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