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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>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_auth_digest.html" title="English"> en </a> |
<a href="../ko/mod/mod_auth_digest.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>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營dentifier:</a></th><td>auth_digest_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source燜ile:</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>
<Location /private/><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>
</Location>
</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 current Internet
Explorer implementations has known issues, namely that <code>GET</code>
requests with a query string are 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 request URI 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>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>
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