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124 lines
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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--><title>mod_authn_dbm - Apache HTTP Server</title><link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /><link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /><link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link href="../images/favicon.ico" rel="shortcut icon" /></head><body><div id="page-header"><p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p><p class="apache">Apache HTTP Server Version 2.0</p><img alt="" src="../images/feather.gif" /></div><div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div><div id="path"><a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs-project/">Documentation</a> > <a href="../">Version 2.0</a> > <a href="./">Modules</a></div><div id="page-content"><div id="preamble"><h1>Apache Module mod_authn_dbm</h1><table class="module"><tr><th><a href="module-dict.html#Description">Description:
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</a></th><td>User authentication using DBM files</td></tr><tr><th><a href="module-dict.html#Status">Status:
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</a></th><td>Extension</td></tr><tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:
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</a></th><td>authn_dbm_module</td></tr><tr><th><a href="module-dict.html#SourceFile">Source File:
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</a></th><td>mod_authn_dbm.c</td></tr><tr><th><a href="module-dict.html#Compatibility">Compatibility:
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</a></th><td>Available in Apache 2.0.42 and later</td></tr></table><h3>Summary</h3>
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<p>This module provides authentication front-ends such as
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<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>
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to authenticate users by looking up users in plain text password files.
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Similar functionality is provided by <code class="module"><a href="../mod/mod_authn_file.html">mod_authn_file</a></code>.</p>
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<p>When using <code class="module"><a href="../mod/mod_auth_basic.html">mod_auth_basic</a></code> or
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<code class="module"><a href="../mod/mod_auth_digest.html">mod_auth_digest</a></code>, this module is invoked via the
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<code class="directive"><a href="../mod/mod_auth_basic.html#authbasicprovider">AuthBasicProvider</a></code> or
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<code class="directive"><a href="../mod/mod_auth_digest.html#authdigestprovider">AuthDigestProvider</a></code>
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with the 'dbm' value.</p>
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</div><div id="quickview"><h3 class="directives">Directives</h3><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#authdbmauthoritative">AuthDBMAuthoritative</a></li><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/core.html#authname">AuthName</a></code></li><li><code class="directive"><a href="../mod/core.html#authtype">AuthType</a></code></li><li>
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<code class="directive"><a href="../mod/mod_auth_basic.html#authbasicprovider">AuthBasicProvider</a></code>
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</li><li>
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<code class="directive"><a href="../mod/mod_auth_digest.html#authdigestprovider">AuthDigestProvider</a></code>
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</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="AuthDBMAuthoritative" id="AuthDBMAuthoritative">AuthDBMAuthoritative</a> <a name="authdbmauthoritative" id="authdbmauthoritative">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td>Sets whether authentication and authorization will be
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passwed on to lower level modules</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td>AuthDBMAuthoritative on|off</td></tr><tr><th><a href="directive-dict.html#Default">Default:
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</a></th><td><code>AuthDBMAuthoritative on</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>directory, .htaccess</td></tr><tr><th><a href="directive-dict.html#Override">Override:
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</a></th><td>AuthConfig</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>Extension</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>mod_authn_dbm</td></tr></table>
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<p>Setting the <code class="directive">AuthDBMAuthoritative</code>
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directive explicitly to <strong>'off'</strong> allows for both
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authentication and authorization to be passed on to lower level
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modules (as defined in the <code>Configuration</code> and
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<code>modules.c</code> file if there is <strong>no userID</strong>
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or <strong>rule</strong> matching the supplied userID. If there is
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a userID and/or rule specified; the usual password and access
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checks will be applied and a failure will give an Authorization
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Required reply.</p>
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<p>So if a userID appears in the database of more than one module;
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or if a valid <code class="directive"><a href="../mod/core.html#require">Require</a></code>
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directive applies to more than one module; then the first module
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will verify the credentials; and no access is passed on;
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regardless of the <code class="directive">AuthAuthoritative</code> setting.</p>
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<p>A common use for this is in conjunction with one of the
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auth providers; such as <code class="module"><a href="../mod/mod_authn_file.html">mod_authn_file</a></code>. Whereas this
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DBM module supplies the bulk of the user credential checking; a
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few (administrator) related accesses fall through to a lower
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level with a well protected .htpasswd file.</p>
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<p>By default, control is not passed on and an unknown userID
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or rule will result in an Authorization Required reply. Not
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setting it thus keeps the system secure and forces an NCSA
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compliant behaviour.</p>
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<p>Security: Do consider the implications of allowing a user to
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allow fall-through in his .htaccess file; and verify that this
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is really what you want; Generally it is easier to just secure
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a single .htpasswd file, than it is to secure a database which
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might have more access interfaces.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><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:
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</a></th><td>Sets the type of database file that is used to
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store passwords</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td>AuthDBMType default|SDBM|GDBM|NDBM|DB</td></tr><tr><th><a href="directive-dict.html#Default">Default:
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</a></th><td><code>AuthDBMType default</code></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>directory, .htaccess</td></tr><tr><th><a href="directive-dict.html#Override">Override:
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</a></th><td>AuthConfig</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>Extension</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>mod_authn_dbm</td></tr><tr><th><a href="directive-dict.html#Compatibility">Compatibility:
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</a></th><td>Available in version 2.0.30 and later.</td></tr></table>
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<p>Sets the type of database file that is used to store the passwords.
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The default database type is determined at compile time. The
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availability of other types of database files also depends on
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<a href="../install.html#dbm">compile-time settings</a>.</p>
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<p>It is crucial that whatever program you use to create your password
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files is configured to use the same type of database.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><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:
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</a></th><td>Sets the name of a database file containing the list of users and
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passwords for authentication</td></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td>AuthDBMUserFile <em>file-path</em></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>directory, .htaccess</td></tr><tr><th><a href="directive-dict.html#Override">Override:
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</a></th><td>AuthConfig</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>Extension</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>mod_authn_dbm</td></tr></table>
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<p>The <code class="directive">AuthDBMUserFile</code> directive sets the
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name of a DBM file containing the list of users and passwords for
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user authentication. <em>File-path</em> is the absolute path to
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the user file.</p>
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<p>The user file is keyed on the username. The value for a user is
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the <code>crypt()</code> encrypted password, optionally followed
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by a colon and arbitrary data. The colon and the data following it
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will be ignored by the server.</p>
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<p>Security: make sure that the
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<code class="directive">AuthDBMUserFile</code> is stored outside the
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document tree of the web-server; do <em>not</em> put it in the
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directory that it protects. Otherwise, clients will be able to
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download the <code class="directive">AuthDBMUserFile</code>.</p>
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<p>Important compatibility note: The implementation of
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"dbmopen" in the apache modules reads the string length of the
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hashed values from the DBM data structures, rather than relying
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upon the string being NULL-appended. Some applications, such as
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the Netscape web server, rely upon the string being
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NULL-appended, so if you are having trouble using DBM files
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interchangeably between applications this may be a part of the
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problem.</p>
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<p>A perl script called
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<a href="../programs/dbmmanage.html">dbmmanage</a> is included with
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Apache. This program can be used to create and update DBM
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format password files for use with this module.</p>
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</div></div><div id="footer"><p class="apache">Maintained by the <a href="http://httpd.apache.org/docs-project/">Apache HTTP Server Documentation Project</a></p><p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div></body></html> |