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<th colspan="3" align="center">LPRng-HOWTO: 8 Feb 2002
(For LPRng-3.8.6)</th>
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<td width="80%" align="center" valign="bottom">Chapter
17. Permissions and Authentication</td>
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<h1 class="SECT1"><a name="AEN9264">17.15. Using Kerberos 4
for Authentication</a></h1>
<p><b class="APPLICATION">LPRng</b> has built-in support for
the Project Athena extensions to the RFC1179 protocol. These
provide an extremely simple authentication protocol using an
initial credential exchange. After the initial exchange the
usual RFC1179 protocol is used.</p>
<p>During configuration, if the <tt class=
"FILENAME">krb.h</tt> (Kerberos 4) include file is found,
then this is enabled by default.</p>
<div class="SECT2">
<h2 class="SECT2"><a name="AEN9270">17.15.1. Printcap
Entries</a></h2>
<p>Options used:</p>
<ul>
<li>
<p><tt class="LITERAL">auth=kerberos4</tt><i class=
"EMPHASIS">use Kerberos4 authentication</i></p>
</li>
<li>
<p><tt class="LITERAL">kerberos_id=</tt><i class=
"EMPHASIS">destination server key used by
clients</i></p>
</li>
<li>
<p><tt class=
"LITERAL">kerberos_server_principal=</tt><i class=
"EMPHASIS">alias for kerberos_id</i></p>
</li>
</ul>
<br>
<br>
<p>Example printcap entry:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN9287"></a>
<pre class="SCREEN">
pr:
:lp=pr@wayoff
:auth=kerberos4
:kerberos_id=lpr/wayoff.private@ASTART.COM
</pre>
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<br>
<br>
<p>The configuration information for Kerberos4 and
Kerberos5 is identical and differ only in the
authentication type. Note that only client to server
authentication is supported.</p>
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