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             <p>This document refers to the <strong>2.0</strong> version of Apache httpd, which <strong>is no longer maintained</strong>. Upgrade, and refer to the current version of httpd instead, documented at:</p>
         <ul><li><a href="http://httpd.apache.org/docs/current/">Current release version of Apache HTTP Server documentation</a></li></ul><p>You may follow <a href="http://httpd.apache.org/docs/current/mod/mod_auth_digest.html">this link</a> to go to the current version of this document.</p></div><div id="preamble"><h1>Apache Module mod_auth_digest</h1>
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 <p><span>Available Languages: </span><a href="../en/mod/mod_auth_digest.html" title="English">&nbsp;en&nbsp;</a> |
 <a href="../ko/mod/mod_auth_digest.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
 </div>
 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>User authentication using MD5
     Digest Authentication.</td></tr>
 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 <tr><th><a href="module-dict.html#ModuleIdentifier">Module&#160;Identifier:</a></th><td>auth_digest_module</td></tr>
 <tr><th><a href="module-dict.html#SourceFile">Source&#160;File:</a></th><td>mod_auth_digest.c</td></tr></table>
 <h3>Summary</h3>

     <p>This module implements HTTP Digest Authentication. However, it
     has not been extensively tested and is therefore marked
     experimental.</p>
 </div>
 <div id="quickview"><h3 class="directives">Directives</h3>
 <ul id="toc">
 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestalgorithm">AuthDigestAlgorithm</a></li>
 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestdomain">AuthDigestDomain</a></li>
 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestfile">AuthDigestFile</a></li>
 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestgroupfile">AuthDigestGroupFile</a></li>
 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestnccheck">AuthDigestNcCheck</a></li>
 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestnonceformat">AuthDigestNonceFormat</a></li>
 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestnoncelifetime">AuthDigestNonceLifetime</a></li>
 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestqop">AuthDigestQop</a></li>
 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestshmemsize">AuthDigestShmemSize</a></li>
 </ul>
 <h3>Topics</h3>
 <ul id="topics">
 <li><img alt="" src="../images/down.gif" /> <a href="#using">Using Digest Authentication</a></li>
 <li><img alt="" src="../images/down.gif" /> <a href="#msie">Working with MS Internet Explorer</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><code class="directive"><a href="../mod/core.html#require">Require</a></code></li>
 <li><code class="directive"><a href="../mod/core.html#satisfy">Satisfy</a></code></li>
 </ul></div>
 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 <div class="section">
 <h2><a name="using" id="using">Using Digest Authentication</a></h2>

     <p>Using MD5 Digest authentication is very simple. Simply set
     up authentication normally, using <code>AuthType Digest</code> and
     <code class="directive"><a href="#authdigestfile">AuthDigestFile</a></code> instead
     of the normal <code>AuthType Basic</code> and <code class="directive"><a href="../mod/mod_auth.html#authuserfile">AuthUserFile</a></code>; also, replace any <code class="directive"><a href="../mod/mod_auth.html#authgroupfile">AuthGroupFile</a></code> with <code class="directive"><a href="#authdigestgroupfile">AuthDigestGroupFile</a></code>. Then add a
     <code class="directive"><a href="#authdigestdomain">AuthDigestDomain</a></code> directive
     containing at least the root URI(s) for this protection space.</p>

     <p>Appropriate user (text) files can be created using the
     <code class="program"><a href="../programs/htdigest.html">htdigest</a></code> tool.</p>

     <div class="example"><h3>Example:</h3><p><code>
       &lt;Location /private/&gt;<br />
       <span class="indent">
         AuthType Digest<br />
         AuthName "private area"<br />
         AuthDigestDomain /private/ http://mirror.my.dom/private2/<br />
         AuthDigestFile /web/auth/.digest_pw<br />
         Require valid-user<br />
       </span>
       &lt;/Location&gt;
     </code></p></div>

     <div class="note"><h3>Note</h3>
     <p>Digest authentication provides a more secure password system
     than Basic authentication, but only works with supporting
     browsers. As of November 2002, the major browsers that support digest
     authentication are <a href="http://www.opera.com/">Opera</a>, <a href="http://www.microsoft.com/windows/ie/">MS Internet
     Explorer</a> (fails when used with a query string - see "<a href="#msie">Working with MS Internet Explorer</a>" below for a workaround), <a href="http://www.w3.org/Amaya/">Amaya</a>, <a href="http://www.mozilla.org">Mozilla</a> and <a href="http://channels.netscape.com/ns/browsers/download.jsp">Netscape</a> since version 7. Since digest authentication is not
     as widely implemented as basic authentication, you should use it only
     in controlled environments.</p>
     </div>
 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 <div class="section">
 <h2><a name="msie" id="msie">Working with MS Internet Explorer</a></h2>
     <p>The Digest authentication implementation in previous Internet
     Explorer for Windows versions (5 and 6) had issues, namely that
     <code>GET</code> requests with a query string were not RFC compliant.
     There are a few ways to work around this issue.</p>

     <p>
     The first way is to use <code>POST</code> requests instead of
     <code>GET</code> requests to pass data to your program.  This method
     is the simplest approach if your application can work with this
     limitation.
     </p>

     <p>Since version 2.0.51 Apache also provides a workaround in the
     <code>AuthDigestEnableQueryStringHack</code> environment variable.
     If <code>AuthDigestEnableQueryStringHack</code> is set for the
     request, Apache will take steps to work around the MSIE bug and
     remove the query string from the digest comparison.  Using this
     method would look similar to the following.</p>

     <div class="example"><h3>Using Digest Authentication with MSIE:</h3><p><code>
     BrowserMatch "MSIE" AuthDigestEnableQueryStringHack=On
     </code></p></div>

     <p>This workaround is not necessary for MSIE 7, though enabling it does
     not cause any compatibility issues or significant overhead.</p>

     <p>See the <code class="directive"><a href="../mod/mod_setenvif.html#browsermatch">BrowserMatch</a></code>
     directive for more details on conditionally setting environment
     variables</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="AuthDigestAlgorithm" id="AuthDigestAlgorithm">AuthDigestAlgorithm</a> <a name="authdigestalgorithm" id="authdigestalgorithm">Directive</a></h2>
 <table class="directive">
 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Selects the algorithm used to calculate the challenge and
 response hases in digest authentication</td></tr>
 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestAlgorithm MD5|MD5-sess</code></td></tr>
 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthDigestAlgorithm MD5</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>Experimental</td></tr>
 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 </table>
     <p>The <code class="directive">AuthDigestAlgorithm</code> directive
     selects the algorithm used to calculate the challenge and response
     hashes.</p>

     <div class="note">
       <code>MD5-sess</code> is not correctly implemented yet.
     </div>


 </div>
 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 <div class="directive-section"><h2><a name="AuthDigestDomain" id="AuthDigestDomain">AuthDigestDomain</a> <a name="authdigestdomain" id="authdigestdomain">Directive</a></h2>
 <table class="directive">
 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URIs that are in the same protection space for digest
 authentication</td></tr>
 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestDomain <var>URI</var> [<var>URI</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>Experimental</td></tr>
 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 </table>
     <p>The <code class="directive">AuthDigestDomain</code> directive allows
     you to specify one or more URIs which are in the same protection
     space (<em>i.e.</em> use the same realm and username/password info).
     The specified URIs are prefixes, <em>i.e.</em> the client will assume
     that all URIs "below" these are also protected by the same
     username/password. The URIs may be either absolute URIs (<em>i.e.</em>
     including a scheme, host, port, etc) or relative URIs.</p>

     <p>This directive <em>should</em> always be specified and
     contain at least the (set of) root URI(s) for this space.
     Omitting to do so will cause the client to send the
     Authorization header for <em>every request</em> sent to this
     server. Apart from increasing the size of the request, it may
     also have a detrimental effect on performance if <code class="directive"><a href="#authdigestnccheck">AuthDigestNcCheck</a></code> is on.</p>

     <p>The URIs specified can also point to different servers, in
     which case clients (which understand this) will then share
     username/password info across multiple servers without
     prompting the user each time.</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="AuthDigestFile" id="AuthDigestFile">AuthDigestFile</a> <a name="authdigestfile" id="authdigestfile">Directive</a></h2>
 <table class="directive">
 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Location of the text file containing the list
 of users and encoded passwords for digest authentication</td></tr>
 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestFile <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>Experimental</td></tr>
 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 </table>
     <p>The <code class="directive">AuthDigestFile</code> directive sets the
     name of a textual file containing the list of users and encoded
     passwords for digest authentication. <var>File-path</var> is the
     absolute path to the user file.</p>

     <p>The digest file uses a special format. Files in this format
     can be created using the <code class="program"><a href="../programs/htdigest.html">htdigest</a></code> utility found in
     the <code>support/</code> subdirectory of the Apache distribution.</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="AuthDigestGroupFile" id="AuthDigestGroupFile">AuthDigestGroupFile</a> <a name="authdigestgroupfile" id="authdigestgroupfile">Directive</a></h2>
 <table class="directive">
 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Name of the text file containing the list of groups
 for digest authentication</td></tr>
 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestGroupFile <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>Experimental</td></tr>
 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 </table>
     <p>The <code class="directive">AuthDigestGroupFile</code> directive sets
     the name of a textual file containing the list of groups and their
     members (user names). <var>File-path</var> is the absolute path to
     the group file.</p>

     <p>Each line of the group file contains a groupname followed by
     a colon, followed by the member usernames separated by spaces.
     Example:</p>

     <div class="example"><p><code>mygroup: bob joe anne</code></p></div>

     <p>Note that searching large text files is <em>very</em>
     inefficient.</p>

     <div class="warning"><h3>Security:</h3>
     <p>Make sure that the <code class="directive">AuthGroupFile</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 may be able
     to download the <code class="directive">AuthGroupFile</code>.</p>
     </div>

 </div>
 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 <div class="directive-section"><h2><a name="AuthDigestNcCheck" id="AuthDigestNcCheck">AuthDigestNcCheck</a> <a name="authdigestnccheck" id="authdigestnccheck">Directive</a></h2>
 <table class="directive">
 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enables or disables checking of the nonce-count sent by the
 server</td></tr>
 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestNcCheck On|Off</code></td></tr>
 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthDigestNcCheck Off</code></td></tr>
 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 </table>
     <div class="note">
       Not implemented yet.
     </div>


 </div>
 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 <div class="directive-section"><h2><a name="AuthDigestNonceFormat" id="AuthDigestNonceFormat">AuthDigestNonceFormat</a> <a name="authdigestnonceformat" id="authdigestnonceformat">Directive</a></h2>
 <table class="directive">
 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Determines how the nonce is generated</td></tr>
 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestNonceFormat <var>format</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>Experimental</td></tr>
 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 </table>
     <div class="note">Not implemented yet.</div>


 </div>
 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 <div class="directive-section"><h2><a name="AuthDigestNonceLifetime" id="AuthDigestNonceLifetime">AuthDigestNonceLifetime</a> <a name="authdigestnoncelifetime" id="authdigestnoncelifetime">Directive</a></h2>
 <table class="directive">
 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>How long the server nonce is valid</td></tr>
 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestNonceLifetime <var>seconds</var></code></td></tr>
 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthDigestNonceLifetime 300</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>Experimental</td></tr>
 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 </table>
     <p>The <code class="directive">AuthDigestNonceLifetime</code> directive
     controls how long the server nonce is valid. When the client
     contacts the server using an expired nonce the server will send
     back a 401 with <code>stale=true</code>. If <var>seconds</var> is
     greater than 0 then it specifies the amount of time for which the
     nonce is valid; this should probably never be set to less than 10
     seconds. If <var>seconds</var> is less than 0 then the nonce never
     expires.
     </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="AuthDigestQop" id="AuthDigestQop">AuthDigestQop</a> <a name="authdigestqop" id="authdigestqop">Directive</a></h2>
 <table class="directive">
 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Determines the quality-of-protection to use in digest
 authentication</td></tr>
 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestQop none|auth|auth-int [auth|auth-int]</code></td></tr>
 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthDigestQop auth</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>Experimental</td></tr>
 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 </table>
     <p>The <code class="directive">AuthDigestQop</code> directive determines
     the <dfn>quality-of-protection</dfn> to use. <code>auth</code> will only do
     authentication (username/password); <code>auth-int</code> is
     authentication plus integrity checking (an MD5 hash of the entity
     is also computed and checked); <code>none</code> will cause the module
     to use the old RFC-2069 digest algorithm (which does not include
     integrity checking). Both <code>auth</code> and <code>auth-int</code> may
     be specified, in which the case the browser will choose which of
     these to use. <code>none</code> should only be used if the browser for
     some reason does not like the challenge it receives otherwise.</p>

     <div class="note">
       <code>auth-int</code> is not implemented yet.
     </div>

 </div>
 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 <div class="directive-section"><h2><a name="AuthDigestShmemSize" id="AuthDigestShmemSize">AuthDigestShmemSize</a> <a name="authdigestshmemsize" id="authdigestshmemsize">Directive</a></h2>
 <table class="directive">
 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The amount of shared memory to allocate for keeping track
 of clients</td></tr>
 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestShmemSize <var>size</var></code></td></tr>
 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthDigestShmemSize 1000</code></td></tr>
 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 </table>
     <p>The <code class="directive">AuthDigestShmemSize</code> directive defines
     the amount of shared memory, that will be allocated at the server
     startup for keeping track of clients. Note that the shared memory
     segment cannot be set less than the space that is neccessary for
     tracking at least <em>one</em> client. This value is dependant on your
     system. If you want to find out the exact value, you may simply
     set <code class="directive">AuthDigestShmemSize</code> to the value of
     <code>0</code> and read the error message after trying to start the
     server.</p>

     <p>The <var>size</var> is normally expressed in Bytes, but you
     may let the number follow a <code>K</code> or an <code>M</code> to
     express your value as KBytes or MBytes. For example, the following
     directives are all equivalent:</p>

     <div class="example"><p><code>
       AuthDigestShmemSize 1048576<br />
       AuthDigestShmemSize 1024K<br />
       AuthDigestShmemSize 1M
     </code></p></div>

 </div>
 </div>
 <div class="bottomlang">
 <p><span>Available Languages: </span><a href="../en/mod/mod_auth_digest.html" title="English">&nbsp;en&nbsp;</a> |
 <a href="../ko/mod/mod_auth_digest.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
 </div><div id="footer">
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