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      <tr>
        <th colspan="3" align="center">LPRng Reference Manual: 24
        Sep 2004 (For LPRng-3.8.28)</th>
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        <td width="80%" align="center" valign="bottom">Chapter 17.
        Permissions and Authentication</td>

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  <div class="SECT1">
    <h1 class="SECT1"><a name="AEN9469" id="AEN9469">17.14. 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="AEN9475" id="AEN9475">17.14.1.
      Printcap Entries</a></h2>

      <p>Options used:</p>

      <ul>
        <li>
          <p><tt class="LITERAL">auth=kerberos4</tt><span class=
          "emphasis"><i class="EMPHASIS">use Kerberos4
          authentication</i></span></p>
        </li>

        <li>
          <p><tt class="LITERAL">kerberos_id=</tt><span class=
          "emphasis"><i class="EMPHASIS">destination server key
          used by clients</i></span></p>
        </li>

        <li>
          <p><tt class=
          "LITERAL">kerberos_server_principal=</tt><span class=
          "emphasis"><i class="EMPHASIS">alias for
          kerberos_id</i></span></p>
        </li>
      </ul>

      <p>Example printcap entry:</p>

      <div class="INFORMALEXAMPLE">
        <a name="AEN9492" id="AEN9492"></a>
        <pre class="SCREEN">
pr:
    :lp=pr@wayoff
    :auth=kerberos4
    :kerberos_id=lpr/wayoff.private@ASTART.COM
</pre>
      </div>

      <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>
    </div>
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