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<title>mod_dav - 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="page-content">
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<div id="preamble"><h1>Apache Module mod_dav</h1>
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<p><span>Available Languages: </span><a href="../en/mod/mod_dav.html" title="English"> en </a> |
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<a href="../ja/mod/mod_dav.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
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<a href="../ko/mod/mod_dav.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>Distributed Authoring and Versioning
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(<a href="http://www.webdav.org/">WebDAV</a>) functionality</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>dav_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mod_dav.c</td></tr></table>
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<p>This module provides class 1 and class 2 <a href="http://www.webdav.org">WebDAV</a> ('Web-based Distributed
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Authoring and Versioning') functionality for Apache. This
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extension to the HTTP protocol allows creating, moving,
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copying, and deleting resources and collections on a remote web
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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="#dav">Dav</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#davdepthinfinity">DavDepthInfinity</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#davmintimeout">DavMinTimeout</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#example">Enabling WebDAV</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#security">Security Issues</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#complex">Complex Configurations</a></li>
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</ul><h3>See also</h3>
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<li><code class="directive"><a href="../mod/mod_dav_fs.html#davlockdb">DavLockDB</a></code></li>
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<li><code class="directive"><a href="../mod/core.html#limitxmlrequestbody">LimitXMLRequestBody</a></code></li>
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<li><a href="http://www.webdav.org">WebDAV Resources</a></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="example" id="example">Enabling WebDAV</a></h2>
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<p>To enable <code class="module"><a href="../mod/mod_dav.html">mod_dav</a></code>, add the following to a
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container in your <code>httpd.conf</code> file:</p>
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<div class="example"><p><code>Dav On</code></p></div>
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<p>This enables the DAV file system provider, which is implemented
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by the <code class="module"><a href="../mod/mod_dav_fs.html">mod_dav_fs</a></code> module. Therefore, that module
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must be compiled into the server or loaded at runtime using the
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<code class="directive"><a href="../mod/mod_so.html#loadmodule">LoadModule</a></code> directive.</p>
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<p>In addition, a location for the DAV lock database must be
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specified in the global section of your <code>httpd.conf</code>
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file using the <code class="directive"><a href="../mod/mod_dav_fs.html#davlockdb">DavLockDB</a></code>
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<div class="example"><p><code>
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DavLockDB /usr/local/apache2/var/DavLock
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<p>The directory containing the lock database file must be
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writable by the <code class="directive"><a href="../mod/mpm_common.html#user">User</a></code>
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and <code class="directive"><a href="../mod/mpm_common.html#group">Group</a></code> under which
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Apache is running.</p>
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<p>You may wish to add a <code class="directive"><a href="../mod/core.html#limit"><Limit></a></code> clause inside the <code class="directive"><a href="../mod/core.html#location"><Location></a></code> directive to limit access to
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DAV-enabled locations. If you want to set the maximum amount of
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bytes that a DAV client can send at one request, you have to use
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the <code class="directive"><a href="../mod/core.html#limitxmlrequestbody">LimitXMLRequestBody</a></code>
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directive. The "normal" <code class="directive"><a href="../mod/core.html#limitrequestbody">LimitRequestBody</a></code> directive has no effect on DAV
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<div class="example"><h3>Full Example</h3><p><code>
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DavLockDB /usr/local/apache2/var/DavLock<br />
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<Location /foo><br />
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Order Allow,Deny<br />
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AuthUserFile user.passwd<br />
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<LimitExcept GET OPTIONS><br />
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<span class="indent">
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require user admin<br />
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</LimitExcept><br />
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</Location><br />
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<p><code class="module"><a href="../mod/mod_dav.html">mod_dav</a></code> is a descendent of Greg Stein's <a href="http://www.webdav.org/mod_dav/">mod_dav for Apache 1.3</a>. More
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information about the module is available from that site.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="security" id="security">Security Issues</a></h2>
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<p>Since DAV access methods allow remote clients to manipulate
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files on the server, you must take particular care to assure that
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your server is secure before enabling <code class="module"><a href="../mod/mod_dav.html">mod_dav</a></code>.</p>
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<p>Any location on the server where DAV is enabled should be
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protected by authentication. The use of HTTP Basic Authentication
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is not recommended. You should use at least HTTP Digest
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Authentication, which is provided by the
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<code class="module"><a href="../mod/mod_auth_digest.html">mod_auth_digest</a></code> module. Nearly all WebDAV clients
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support this authentication method. An alternative is Basic
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Authentication over an <a href="../ssl/">SSL</a> enabled
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<p>In order for <code class="module"><a href="../mod/mod_dav.html">mod_dav</a></code> to manage files, it must
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be able to write to the directories and files under its control
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using the <code class="directive"><a href="../mod/mpm_common.html#user">User</a></code> and
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<code class="directive"><a href="../mod/mpm_common.html#group">Group</a></code> under which
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Apache is running. New files created will also be owned by this
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<code class="directive"><a href="../mod/mpm_common.html#user">User</a></code> and <code class="directive"><a href="../mod/mpm_common.html#group">Group</a></code>. For this reason, it is
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important to control access to this account. The DAV repository
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is considered private to Apache; modifying files outside of Apache
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(for example using FTP or filesystem-level tools) should not be
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<p><code class="module"><a href="../mod/mod_dav.html">mod_dav</a></code> may be subject to various kinds of
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denial-of-service attacks. The <code class="directive"><a href="../mod/core.html#limitxmlrequestbody">LimitXMLRequestBody</a></code> directive can be
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used to limit the amount of memory consumed in parsing large DAV
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requests. The <code class="directive"><a href="#davdepthinfinity">DavDepthInfinity</a></code> directive can be
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used to prevent <code>PROPFIND</code> requests on a very large
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repository from consuming large amounts of memory. Another
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possible denial-of-service attack involves a client simply filling
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up all available disk space with many large files. There is no
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direct way to prevent this in Apache, so you should avoid giving
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DAV access to untrusted users.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="complex" id="complex">Complex Configurations</a></h2>
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<p>One common request is to use <code class="module"><a href="../mod/mod_dav.html">mod_dav</a></code> to
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manipulate dynamic files (PHP scripts, CGI scripts, etc). This is
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difficult because a <code>GET</code> request will always run the
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script, rather than downloading its contents. One way to avoid
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this is to map two different URLs to the content, one of which
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will run the script, and one of which will allow it to be
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downloaded and manipulated with DAV.</p>
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<div class="example"><p><code>
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Alias /phparea /home/gstein/php_files<br />
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Alias /php-source /home/gstein/php_files<br />
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<Location /php-source>
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<span class="indent">
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ForceType text/plain<br />
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<p>With this setup, <code>http://example.com/phparea</code> can be
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used to access the output of the PHP scripts, and
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<code>http://example.com/php-source</code> can be used with a DAV
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client to manipulate them.</p>
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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="Dav" id="Dav">Dav</a> <a name="dav" id="dav">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>Enable WebDAV HTTP methods</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>Dav On|Off|<var>provider-name</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>Dav Off</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory</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_dav</td></tr>
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<p>Use the <code class="directive">Dav</code> directive to enable the
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WebDAV HTTP methods for the given container:</p>
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<div class="example"><p><code>
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<Location /foo><br />
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<span class="indent">
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<p>The value <code>On</code> is actually an alias for the default
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provider <code>filesystem</code> which is served by the <code class="module"><a href="../mod/mod_dav_fs.html">mod_dav_fs</a></code> module. Note, that once you have DAV enabled
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for some location, it <em>cannot</em> be disabled for sublocations.
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For a complete configuration example have a look at the <a href="#example">section above</a>.</p>
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<div class="warning">
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Do not enable WebDAV until you have secured your server. Otherwise
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everyone will be able to distribute files on your system.
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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="DavDepthInfinity" id="DavDepthInfinity">DavDepthInfinity</a> <a name="davdepthinfinity" id="davdepthinfinity">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>Allow PROPFIND, Depth: Infinity requests</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DavDepthInfinity on|off</code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>DavDepthInfinity off</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</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_dav</td></tr>
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<p>Use the <code class="directive">DavDepthInfinity</code> directive to
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allow the processing of <code>PROPFIND</code> requests containing the
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header 'Depth: Infinity'. Because this type of request could constitute
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a denial-of-service attack, by default it is not allowed.</p>
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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="DavMinTimeout" id="DavMinTimeout">DavMinTimeout</a> <a name="davmintimeout" id="davmintimeout">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>Minimum amount of time the server holds a lock on
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a DAV resource</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>DavMinTimeout <var>seconds</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>DavMinTimeout 0</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</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_dav</td></tr>
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<p>When a client requests a DAV resource lock, it can also
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specify a time when the lock will be automatically removed by
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the server. This value is only a request, and the server can
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ignore it or inform the client of an arbitrary value.</p>
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<p>Use the <code class="directive">DavMinTimeout</code> directive to specify, in
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seconds, the minimum lock timeout to return to a client.
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Microsoft Web Folders defaults to a timeout of 120 seconds; the
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<code class="directive">DavMinTimeout</code> can override this to a higher value
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(like 600 seconds) to reduce the chance of the client losing
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the lock due to network latency.</p>
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<div class="example"><h3>Example</h3><p><code>
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<Location /MSWord><br />
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<span class="indent">
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DavMinTimeout 600<br />
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<div class="bottomlang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_dav.html" title="English"> en </a> |
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<a href="../ja/mod/mod_dav.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
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<a href="../ko/mod/mod_dav.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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</div><div id="footer">
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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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