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<title>mod_authz_owner - Apache HTTP Server</title>
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<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>
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<p class="apache">Apache HTTP Server Version 2.2</p>
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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 2.2</a> > <a href="./">Modules</a></div>
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<div id="preamble"><h1>Apache Module mod_authz_owner</h1>
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<p><span>Available Languages: </span><a href="../en/mod/mod_authz_owner.html" title="English"> en </a> |
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<a href="../ja/mod/mod_authz_owner.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
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<a href="../ko/mod/mod_authz_owner.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>Authorization based on file ownership</td></tr>
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<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
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<tr><th><a href="module-dict.html#ModuleIdentifier">Module�Identifier:</a></th><td>authz_owner_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mod_authz_owner.c</td></tr>
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<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.1 and later</td></tr></table>
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<p>This module authorizes access to files by comparing the userid used
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for HTTP authentication (the web userid) with the file-system owner or
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group of the requested file. The supplied username and password
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must be already properly verified by an authentication module,
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such as <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>. <code class="module"><a href="../mod/mod_authz_owner.html">mod_authz_owner</a></code>
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recognizes two arguments for the <code class="directive"><a href="../mod/core.html#require">Require</a></code> directive, <code>file-owner</code> and
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<code>file-group</code>, as follows:</p>
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<dt><code>file-owner</code></dt>
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<dd>The supplied web-username must match the system's name for the
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owner of the file being requested. That is, if the operating system
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says the requested file is owned by <code>jones</code>, then the
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username used to access it through the web must be <code>jones</code>
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<dt><code>file-group</code></dt>
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<dd>The name of the system group that owns the file must be present
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in a group database, which is provided, for example, by <code class="module"><a href="../mod/mod_authz_groupfile.html">mod_authz_groupfile</a></code> or <code class="module"><a href="../mod/mod_authz_dbm.html">mod_authz_dbm</a></code>,
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and the web-username must be a member of that group. For example, if
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the operating system says the requested file is owned by (system)
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group <code>accounts</code>, the group <code>accounts</code> must
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appear in the group database and the web-username used in the request
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must be a member of that group.</dd>
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<div class="note"><h3>Note</h3>
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<p>If <code class="module"><a href="../mod/mod_authz_owner.html">mod_authz_owner</a></code> is used in order to authorize
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a resource that is not actually present in the filesystem
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(<em>i.e.</em> a virtual resource), it will deny the access.</p>
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<p>Particularly it will never authorize <a href="../content-negotiation.html#multiviews">content negotiated
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"MultiViews"</a> resources.</p>
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<div id="quickview"><h3 class="directives">Directives</h3>
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<li><img alt="" src="../images/down.gif" /> <a href="#authzownerauthoritative">AuthzOwnerAuthoritative</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#examples">Configuration Examples</a></li>
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</ul><h3>See also</h3>
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<li><code class="directive"><a href="../mod/core.html#require">Require</a></code></li>
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<li><code class="directive"><a href="../mod/core.html#satisfy">Satisfy</a></code></li>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<h2><a name="examples" id="examples">Configuration Examples</a></h2>
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<h3><a name="examples.file-owner" id="examples.file-owner">Require file-owner</a></h3>
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<p>Consider a multi-user system running the Apache Web server, with
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each user having his or her own files in <code>~/public_html/private</code>. Assuming that there is a single
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<code class="directive"><a href="../mod/mod_authn_dbm.html#authdbmuserfile">AuthDBMUserFile</a></code> database
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that lists all of their web-usernames, and that these usernames match
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the system's usernames that actually own the files on the server, then
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the following stanza would allow only the user himself access to his
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own files. User <code>jones</code> would not be allowed to access
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files in <code>/home/smith/public_html/private</code> unless they
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were owned by <code>jones</code> instead of <code>smith</code>.</p>
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<div class="example"><p><code>
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<Directory /home/*/public_html/private><br />
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<span class="indent">
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AuthName MyPrivateFiles<br />
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AuthBasicProvider dbm<br />
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AuthDBMUserFile /usr/local/apache2/etc/.htdbm-all<br />
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Require file-owner<br />
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<h3><a name="examples.file-group" id="examples.file-group">Require file-group</a></h3>
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<p>Consider a system similar to the one described above, but with
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some users that share their project files in
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<code>~/public_html/project-foo</code>. The files are owned by the
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system group <code>foo</code> and there is a single <code class="directive"><a href="../mod/mod_authz_dbm.html#authdbmgroupfile">AuthDBMGroupFile</a></code> database that
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contains all of the web-usernames and their group membership,
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<em>i.e.</em> they must be at least member of a group named
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<code>foo</code>. So if <code>jones</code> and <code>smith</code>
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are both member of the group <code>foo</code>, then both will be
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authorized to access the <code>project-foo</code> directories of
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<div class="example"><p><code>
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<Directory /home/*/public_html/project-foo><br />
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<span class="indent">
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AuthName "Project Foo Files"<br />
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AuthBasicProvider dbm<br />
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# combined user/group database<br />
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AuthDBMUserFile /usr/local/apache2/etc/.htdbm-all<br />
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AuthDBMGroupFile /usr/local/apache2/etc/.htdbm-all<br />
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Require file-group<br />
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="AuthzOwnerAuthoritative" id="AuthzOwnerAuthoritative">AuthzOwnerAuthoritative</a> <a name="authzownerauthoritative" id="authzownerauthoritative">Directive</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets whether authorization will be passed on to lower level
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthzOwnerAuthoritative On|Off</code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthzOwnerAuthoritative On</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
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<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_authz_owner</td></tr>
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<p>Setting the <code class="directive">AuthzOwnerAuthoritative</code>
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directive explicitly to <code>Off</code> allows for
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user authorization to be passed on to lower level modules (as defined
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in the <code>modules.c</code> files) if:</p>
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<li>in the case of <code>file-owner</code> the file-system owner does not
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match the supplied web-username or could not be determined, or</li>
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<li>in the case of <code>file-group</code> the file-system group does not
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contain the supplied web-username or could not be determined.</li>
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<p>Note that setting the value to <code>Off</code> also allows the
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combination of <code>file-owner</code> and <code>file-group</code>, so
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access will be allowed if either one or the other (or both) match.</p>
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<p>By default, control is not passed on and an authorization failure
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will result in an "Authentication Required" reply. Not
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setting it to <code>Off</code> thus keeps the system secure and forces
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an NCSA compliant behaviour.</p>
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<p class="apache">Copyright 2006 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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