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<title>mod_authz_dbm - Apache HTTP Server</title>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.4</a> > <a href="./">Modules</a></div>
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<div id="preamble"><h1>Apache Module mod_authz_dbm</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_authz_dbm.html" title="English"> en </a> |
<a href="../ko/mod/mod_authz_dbm.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Group authorization 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>authz_dbm_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_authz_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 authorization capabilities so that
authenticated users can be allowed or denied access to portions
of the web site by group membership. Similar functionality is
provided by <code class="module"><a href="../mod/mod_authz_groupfile.html">mod_authz_groupfile</a></code>.</p>
</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#authdbmgroupfile">AuthDBMGroupFile</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#authzdbmtype">AuthzDBMType</a></li>
</ul>
<h3>See also</h3>
<ul class="seealso">
<li><code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code></li>
</ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="AuthDBMGroupFile" id="AuthDBMGroupFile">AuthDBMGroupFile</a> <a name="authdbmgroupfile" id="authdbmgroupfile">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets the name of the database file containing the list
of user groups for authorization</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDBMGroupFile <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_authz_dbm</td></tr>
</table>
<p>The <code class="directive">AuthDBMGroupFile</code> directive sets the
name of a DBM file containing the list of user groups for user
authorization. <var>File-path</var> is the absolute path to the
group file.</p>
<p>The group file is keyed on the username. The value for a
user is a comma-separated list of the groups to which the users
belongs. There must be no whitespace within the value, and it
must never contain any colons.</p>
<div class="warning"><h3>Security</h3>
<p>Make sure that the <code class="directive">AuthDBMGroupFile</code> is
stored outside the document tree of the web-server. Do
<strong>not</strong> put it in the directory that it protects.
Otherwise, clients will be able to download the
<code class="directive">AuthDBMGroupFile</code> unless otherwise
protected.</p>
</div>
<p>Combining Group and Password DBM files: In some cases it is
easier to manage a single database which contains both the
password and group details for each user. This simplifies any
support programs that need to be written: they now only have to
deal with writing to and locking a single DBM file. This can be
accomplished by first setting the group and password files to
point to the same DBM:</p>
<div class="example"><p><code>
AuthDBMGroupFile /www/userbase<br />
AuthDBMUserFile /www/userbase
</code></p></div>
<p>The key for the single DBM is the username. The value consists
of</p>
<div class="example"><p><code>
Encrypted Password : List of Groups [ : (ignored) ]
</code></p></div>
<p>The password section contains the encrypted
password as before. This is followed by a colon and the comma
separated list of groups. Other data may optionally be left in the
DBM file after another colon; it is ignored by the authorization
module. This is what www.telescope.org uses for its combined
password and group database.</p>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="AuthzDBMType" id="AuthzDBMType">AuthzDBMType</a> <a name="authzdbmtype" id="authzdbmtype">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 list of user groups</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthzDBMType default|SDBM|GDBM|NDBM|DB</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthzDBMType 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_authz_dbm</td></tr>
</table>
<p>Sets the type of database file that is used to store the list
of user groups.
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 group
files is configured to use the same type of database.</p>
</div>
</div>
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