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<div id="preamble"><h1>Apache Module mod_authn_dbm</h1>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>User authentication using DBM files</td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>authn_dbm_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_authn_dbm.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.1 and later</td></tr></table>
<h3>Summary</h3>

    <p>This module provides authentication front-ends such as
    <code class="module"><a href="../mod/mod_auth_digest.html">mod_auth_digest</a></code> and <code class="module"><a href="../mod/mod_auth_basic.html">mod_auth_basic</a></code>
    to authenticate users by looking up users in <dfn>dbm</dfn> password
    files. Similar functionality is provided by
    <code class="module"><a href="../mod/mod_authn_file.html">mod_authn_file</a></code>.</p>

    <p>When using <code class="module"><a href="../mod/mod_auth_basic.html">mod_auth_basic</a></code> or
    <code class="module"><a href="../mod/mod_auth_digest.html">mod_auth_digest</a></code>, this module is invoked via the
    <code class="directive"><a href="../mod/mod_auth_basic.html#authbasicprovider">AuthBasicProvider</a></code> or
    <code class="directive"><a href="../mod/mod_auth_digest.html#authdigestprovider">AuthDigestProvider</a></code>
    with the <code>dbm</code> value.</p>
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<div id="quickview"><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#authdbmtype">AuthDBMType</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authdbmuserfile">AuthDBMUserFile</a></li>
</ul>
<h3>See also</h3>
<ul class="seealso">
<li><code class="directive"><a href="../mod/mod_authn_core.html#authname">AuthName</a></code></li>
<li><code class="directive"><a href="../mod/mod_authn_core.html#authtype">AuthType</a></code></li>
<li>
  <code class="directive"><a href="../mod/mod_auth_basic.html#authbasicprovider">AuthBasicProvider</a></code>
</li>
<li>
  <code class="directive"><a href="../mod/mod_auth_digest.html#authdigestprovider">AuthDigestProvider</a></code>
</li>
<li><code class="program"><a href="../programs/htpasswd.html">htpasswd</a></code></li>
<li><code class="program"><a href="../programs/htdbm.html">htdbm</a></code></li>
<li><a href="../misc/password_encryptions.html">Password Formats</a></li>
</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>

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<div class="directive-section"><h2><a name="AuthDBMType" id="AuthDBMType">AuthDBMType</a> <a name="authdbmtype" id="authdbmtype">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets the type of database file that is used to
store passwords</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDBMType default|SDBM|GDBM|NDBM|DB</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthDBMType default</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_authn_dbm</td></tr>
</table>
    <p>Sets the type of database file that is used to store the passwords.
    The default database type is determined at compile time.  The
    availability of other types of database files also depends on
    <a href="../install.html#dbm">compile-time settings</a>.</p>

    <p>It is crucial that whatever program you use to create your password
    files is configured to use the same type of database.</p>

</div>
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<div class="directive-section"><h2><a name="AuthDBMUserFile" id="AuthDBMUserFile">AuthDBMUserFile</a> <a name="authdbmuserfile" id="authdbmuserfile">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets the name of a database file containing the list of users and
passwords for authentication</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDBMUserFile <var>file-path</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_authn_dbm</td></tr>
</table>
    <p>The <code class="directive">AuthDBMUserFile</code> directive sets the
    name of a DBM file containing the list of users and passwords for
    user authentication. <var>File-path</var> is the absolute path to
    the user file.</p>

    <p>The user file is keyed on the username. The value for a user is
    the encrypted password, optionally followed by a colon and arbitrary
    data. The colon and the data following it will be ignored by the
    server.</p>

    <div class="warning"><h3>Security:</h3>
      <p>Make sure that the <code class="directive">AuthDBMUserFile</code> is stored
      outside the document tree of the web-server; do <em>not</em> put it in
      the directory that it protects. Otherwise, clients will be able to
      download the <code class="directive">AuthDBMUserFile</code>.</p>
    </div>

    <p>The encrypted password format depends on which authentication
    frontend (e.g. <code class="module"><a href="../mod/mod_authn_basic.html">mod_authn_basic</a></code> or
    <code class="module"><a href="../mod/mod_authn_digest.html">mod_authn_digest</a></code>) is being used.  See <a href="../misc/password_encryptions.html">Password Formats</a> for
    more information.</p>

    <p>Important compatibility note: The implementation of
    <code>dbmopen</code> in the apache modules reads the string length of
    the hashed values from the DBM data structures, rather than relying
    upon the string being NULL-appended. Some applications, such as
    the Netscape web server, rely upon the string being
    NULL-appended, so if you are having trouble using DBM files
    interchangeably between applications this may be a part of the
    problem.</p>

    <p>A perl script called
    <code class="program"><a href="../programs/dbmmanage.html">dbmmanage</a></code> is included with
    Apache. This program can be used to create and update DBM
    format password files for use with this module. Another
    tool for maintaining the DBM files is the included program
    <code class="program"><a href="../programs/htdbm.html">htdbm</a></code>.</p>

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