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<title>mod_auth_digest - Apache HTTP Server</title>
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<div id="preamble"><h1>Apache Module mod_auth_digest</h1>
<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 Identifier:</a></th><td>auth_digest_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source 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>
</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
    <a href="../programs/htdigest.html">htdigest</a> 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), <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="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>
    inluding 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 <a href="../programs/htdigest.html">htdigest</a> 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 quality-of-protection 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>
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