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<h1>Courier Authentication Library</h1>
<p>This is the Courier authentication library. Copies of this library code
used to exist in other tarballs: Courier, Courier-IMAP, and SqWebMail.
Building and installing any of these packages would've automatically
installed this authentication code.</p>
<p>The authentication library is now a separate, standalone package. This
authentication library must now be installed, separately, before upgrading to
the following builds (or if installing them for the first time): Courier
0.48, Courier-IMAP 4.0, and SqWebMail 5.0. See <a href="NEWS.html">NEWS</a>
for more information.</p>
<p>Download: <a target="_blank"
href="http://www.courier-mta.org/download.php#authlib">http://www.courier-mta.org/download.php#authlib</a></p>
<h2>Overview</h2>
<p>The Courier authentication library provides authentication services for
other Courier applications. In this context, the term "authentication" refers
to the following functions:</p>
<ol>
<li>Take a userid or a loginid, and a password. Determine whether the
loginid and the password are valid.</li>
<li>Given a userid, obtain the following information about the userid:
<ol type="A">
<li>The account's home directory.</li>
<li>The numeric system userid and groupid that owns all files
associated with this account.</li>
<li>The location of the account's maildir.</li>
<li>Any maildir quota defined for this account. See the Courier
documentation for more information on maildir quotas.</li>
<li>Other miscellaneous account-specific options.</li>
</ol>
</li>
<li>Change the password associated with a loginid.</li>
<li>Obtain a complete list of all loginids.</li>
</ol>
<p>The Courier authentication library provides alternative implementations of
these authentication services:</p>
<ol>
<li>Use the traditional system password files: <code>/etc/passwd</code> and
<code>/etc/shadow</code>, possibly in conjunction with the PAM
library.</li>
<li>Maintain all this information in a GDBM or a DB database. The GDBM or
the DB database is compiled from plain text files. Perl scripts provide a
simple interface for creating and editing the authentication information,
then a script compiles the plain text files into a database.</li>
<li>Use an LDAP server for authentication.</li>
<li>Use a table in a MySQL database for authentication.</li>
<li>Use a table in a PostgreSQL database for authentication.</li>
</ol>
<p>All Courier components that use this authentication library, therefore,
will be able to authenticate E-mail accounts
using any of the above methods.</p>
<p>Additional information can be found in the <a
href="INSTALL.html">INSTALL</a> file.</p>
<p>The authentication API is <a href="authlib.html">documented</a>.</p>
<h2>Further resources</h2>
<p>Subscribe to the courier-users mailing list: <a
href="http://lists.sourceforge.net/lists/listinfo/courier-users"><code>http://lists.sourceforge.net/lists/listinfo/courier-users</code></a>.</p>
<p></p>
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