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   8 <title>mod_auth_digest - Apache HTTP Server</title>
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  16 <p class="apache">Apache HTTP Server Version 2.0</p>
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  20 <a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.0</a> &gt; <a href="./">Modules</a></div>
  21 <div id="page-content">
  22 <div id="preamble"><h1>Apache Module mod_auth_digest</h1>
  23 <div class="toplang">
  24 <p><span>Available Languages: </span><a href="../en/mod/mod_auth_digest.html" title="English">&nbsp;en&nbsp;</a> |
  25 <a href="../ko/mod/mod_auth_digest.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
  26 </div>
  27 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>User authentication using MD5
  28     Digest Authentication.</td></tr>
  29 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
  30 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>auth_digest_module</td></tr>
  31 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_auth_digest.c</td></tr></table>
  32 <h3>Summary</h3>
  33
  34     <p>This module implements HTTP Digest Authentication. However, it
  35     has not been extensively tested and is therefore marked
  36     experimental.</p>
  37 </div>
  38 <div id="quickview"><h3 class="directives">Directives</h3>
  39 <ul id="toc">
  40 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestalgorithm">AuthDigestAlgorithm</a></li>
  41 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestdomain">AuthDigestDomain</a></li>
  42 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestfile">AuthDigestFile</a></li>
  43 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestgroupfile">AuthDigestGroupFile</a></li>
  44 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestnccheck">AuthDigestNcCheck</a></li>
  45 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestnonceformat">AuthDigestNonceFormat</a></li>
  46 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestnoncelifetime">AuthDigestNonceLifetime</a></li>
  47 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestqop">AuthDigestQop</a></li>
  48 <li><img alt="" src="../images/down.gif" /> <a href="#authdigestshmemsize">AuthDigestShmemSize</a></li>
  49 </ul>
  50 <h3>Topics</h3>
  51 <ul id="topics">
  52 <li><img alt="" src="../images/down.gif" /> <a href="#using">Using Digest Authentication</a></li>
  53 <li><img alt="" src="../images/down.gif" /> <a href="#msie">Working with MS Internet Explorer</a></li>
  54 </ul><h3>See also</h3>
  55 <ul class="seealso">
  56 <li><code class="directive"><a href="../mod/core.html#authname">AuthName</a></code></li>
  57 <li><code class="directive"><a href="../mod/core.html#authtype">AuthType</a></code></li>
  58 <li><code class="directive"><a href="../mod/core.html#require">Require</a></code></li>
  59 <li><code class="directive"><a href="../mod/core.html#satisfy">Satisfy</a></code></li>
  60 </ul></div>
  61 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
  62 <div class="section">
  63 <h2><a name="using" id="using">Using Digest Authentication</a></h2>
  64
  65     <p>Using MD5 Digest authentication is very simple. Simply set
  66     up authentication normally, using <code>AuthType Digest</code> and
  67     <code class="directive"><a href="#authdigestfile">AuthDigestFile</a></code> instead
  68     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
  69     <code class="directive"><a href="#authdigestdomain">AuthDigestDomain</a></code> directive
  70     containing at least the root URI(s) for this protection space.</p>
  71
  72     <p>Appropriate user (text) files can be created using the
  73     <code class="program"><a href="../programs/htdigest.html">htdigest</a></code> tool.</p>
  74
  75     <div class="example"><h3>Example:</h3><p><code>
  76       &lt;Location /private/&gt;<br />
  77       <span class="indent">
  78         AuthType Digest<br />
  79         AuthName "private area"<br />
  80         AuthDigestDomain /private/ http://mirror.my.dom/private2/<br />
  81         AuthDigestFile /web/auth/.digest_pw<br />
  82         Require valid-user<br />
  83       </span>
  84       &lt;/Location&gt;
  85     </code></p></div>
  86
  87     <div class="note"><h3>Note</h3>
  88     <p>Digest authentication provides a more secure password system
  89     than Basic authentication, but only works with supporting
  90     browsers. As of November 2002, the major browsers that support digest
  91     authentication are <a href="http://www.opera.com/">Opera</a>, <a href="http://www.microsoft.com/windows/ie/">MS Internet
  92     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
  93     as widely implemented as basic authentication, you should use it only
  94     in controlled environments.</p>
  95     </div>
  96 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
  97 <div class="section">
  98 <h2><a name="msie" id="msie">Working with MS Internet Explorer</a></h2>
  99     <p>The Digest authentication implementation in previous Internet
 100     Explorer for Windows versions (5 and 6) had issues, namely that
 101     <code>GET</code> requests with a query string were not RFC compliant.
 102     There are a few ways to work around this issue.</p>
 103
 104     <p>
 105     The first way is to use <code>POST</code> requests instead of
 106     <code>GET</code> requests to pass data to your program.  This method
 107     is the simplest approach if your application can work with this
 108     limitation.
 109     </p>
 110
 111     <p>Since version 2.0.51 Apache also provides a workaround in the
 112     <code>AuthDigestEnableQueryStringHack</code> environment variable.
 113     If <code>AuthDigestEnableQueryStringHack</code> is set for the
 114     request, Apache will take steps to work around the MSIE bug and
 115     remove the query string from the digest comparison.  Using this
 116     method would look similar to the following.</p>
 117
 118     <div class="example"><h3>Using Digest Authentication with MSIE:</h3><p><code>
 119     BrowserMatch "MSIE" AuthDigestEnableQueryStringHack=On
 120     </code></p></div>
 121
 122     <p>This workaround is not necessary for MSIE 7, though enabling it does
 123     not cause any compatibility issues or significant overhead.</p>
 124
 125     <p>See the <code class="directive"><a href="../mod/mod_setenvif.html#browsermatch">BrowserMatch</a></code>
 126     directive for more details on conditionally setting environment
 127     variables</p>
 128 </div>
 129 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 130 <div class="directive-section"><h2><a name="AuthDigestAlgorithm" id="AuthDigestAlgorithm">AuthDigestAlgorithm</a> <a name="authdigestalgorithm" id="authdigestalgorithm">Directive</a></h2>
 131 <table class="directive">
 132 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Selects the algorithm used to calculate the challenge and
 133 response hases in digest authentication</td></tr>
 134 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestAlgorithm MD5|MD5-sess</code></td></tr>
 135 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthDigestAlgorithm MD5</code></td></tr>
 136 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
 137 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
 138 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 139 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 140 </table>
 141     <p>The <code class="directive">AuthDigestAlgorithm</code> directive
 142     selects the algorithm used to calculate the challenge and response
 143     hashes.</p>
 144
 145     <div class="note">
 146       <code>MD5-sess</code> is not correctly implemented yet.
 147     </div>
 148
 149
 150 </div>
 151 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 152 <div class="directive-section"><h2><a name="AuthDigestDomain" id="AuthDigestDomain">AuthDigestDomain</a> <a name="authdigestdomain" id="authdigestdomain">Directive</a></h2>
 153 <table class="directive">
 154 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>URIs that are in the same protection space for digest
 155 authentication</td></tr>
 156 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestDomain <var>URI</var> [<var>URI</var>] ...</code></td></tr>
 157 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
 158 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
 159 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 160 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 161 </table>
 162     <p>The <code class="directive">AuthDigestDomain</code> directive allows
 163     you to specify one or more URIs which are in the same protection
 164     space (<em>i.e.</em> use the same realm and username/password info).
 165     The specified URIs are prefixes, <em>i.e.</em> the client will assume
 166     that all URIs "below" these are also protected by the same
 167     username/password. The URIs may be either absolute URIs (<em>i.e.</em>
 168     including a scheme, host, port, etc) or relative URIs.</p>
 169
 170     <p>This directive <em>should</em> always be specified and
 171     contain at least the (set of) root URI(s) for this space.
 172     Omitting to do so will cause the client to send the
 173     Authorization header for <em>every request</em> sent to this
 174     server. Apart from increasing the size of the request, it may
 175     also have a detrimental effect on performance if <code class="directive"><a href="#authdigestnccheck">AuthDigestNcCheck</a></code> is on.</p>
 176
 177     <p>The URIs specified can also point to different servers, in
 178     which case clients (which understand this) will then share
 179     username/password info across multiple servers without
 180     prompting the user each time.</p>
 181
 182 </div>
 183 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 184 <div class="directive-section"><h2><a name="AuthDigestFile" id="AuthDigestFile">AuthDigestFile</a> <a name="authdigestfile" id="authdigestfile">Directive</a></h2>
 185 <table class="directive">
 186 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Location of the text file containing the list
 187 of users and encoded passwords for digest authentication</td></tr>
 188 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestFile <var>file-path</var></code></td></tr>
 189 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
 190 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
 191 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 192 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 193 </table>
 194     <p>The <code class="directive">AuthDigestFile</code> directive sets the
 195     name of a textual file containing the list of users and encoded
 196     passwords for digest authentication. <var>File-path</var> is the
 197     absolute path to the user file.</p>
 198
 199     <p>The digest file uses a special format. Files in this format
 200     can be created using the <code class="program"><a href="../programs/htdigest.html">htdigest</a></code> utility found in
 201     the <code>support/</code> subdirectory of the Apache distribution.</p>
 202
 203 </div>
 204 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 205 <div class="directive-section"><h2><a name="AuthDigestGroupFile" id="AuthDigestGroupFile">AuthDigestGroupFile</a> <a name="authdigestgroupfile" id="authdigestgroupfile">Directive</a></h2>
 206 <table class="directive">
 207 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Name of the text file containing the list of groups
 208 for digest authentication</td></tr>
 209 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestGroupFile <var>file-path</var></code></td></tr>
 210 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
 211 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
 212 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 213 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 214 </table>
 215     <p>The <code class="directive">AuthDigestGroupFile</code> directive sets
 216     the name of a textual file containing the list of groups and their
 217     members (user names). <var>File-path</var> is the absolute path to
 218     the group file.</p>
 219
 220     <p>Each line of the group file contains a groupname followed by
 221     a colon, followed by the member usernames separated by spaces.
 222     Example:</p>
 223
 224     <div class="example"><p><code>mygroup: bob joe anne</code></p></div>
 225
 226     <p>Note that searching large text files is <em>very</em>
 227     inefficient.</p>
 228
 229     <div class="warning"><h3>Security:</h3>
 230     <p>Make sure that the <code class="directive">AuthGroupFile</code> is stored
 231     outside the document tree of the web-server; do <em>not</em> put it in
 232     the directory that it protects. Otherwise, clients may be able
 233     to download the <code class="directive">AuthGroupFile</code>.</p>
 234     </div>
 235
 236 </div>
 237 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 238 <div class="directive-section"><h2><a name="AuthDigestNcCheck" id="AuthDigestNcCheck">AuthDigestNcCheck</a> <a name="authdigestnccheck" id="authdigestnccheck">Directive</a></h2>
 239 <table class="directive">
 240 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enables or disables checking of the nonce-count sent by the
 241 server</td></tr>
 242 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestNcCheck On|Off</code></td></tr>
 243 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthDigestNcCheck Off</code></td></tr>
 244 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
 245 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 246 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 247 </table>
 248     <div class="note">
 249       Not implemented yet.
 250     </div>
 251
 252
 253 </div>
 254 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 255 <div class="directive-section"><h2><a name="AuthDigestNonceFormat" id="AuthDigestNonceFormat">AuthDigestNonceFormat</a> <a name="authdigestnonceformat" id="authdigestnonceformat">Directive</a></h2>
 256 <table class="directive">
 257 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Determines how the nonce is generated</td></tr>
 258 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestNonceFormat <var>format</var></code></td></tr>
 259 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
 260 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
 261 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 262 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 263 </table>
 264     <div class="note">Not implemented yet.</div>
 265
 266
 267 </div>
 268 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 269 <div class="directive-section"><h2><a name="AuthDigestNonceLifetime" id="AuthDigestNonceLifetime">AuthDigestNonceLifetime</a> <a name="authdigestnoncelifetime" id="authdigestnoncelifetime">Directive</a></h2>
 270 <table class="directive">
 271 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>How long the server nonce is valid</td></tr>
 272 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestNonceLifetime <var>seconds</var></code></td></tr>
 273 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthDigestNonceLifetime 300</code></td></tr>
 274 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
 275 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
 276 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 277 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 278 </table>
 279     <p>The <code class="directive">AuthDigestNonceLifetime</code> directive
 280     controls how long the server nonce is valid. When the client
 281     contacts the server using an expired nonce the server will send
 282     back a 401 with <code>stale=true</code>. If <var>seconds</var> is
 283     greater than 0 then it specifies the amount of time for which the
 284     nonce is valid; this should probably never be set to less than 10
 285     seconds. If <var>seconds</var> is less than 0 then the nonce never
 286     expires.
 287     </p>
 288
 289 </div>
 290 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 291 <div class="directive-section"><h2><a name="AuthDigestQop" id="AuthDigestQop">AuthDigestQop</a> <a name="authdigestqop" id="authdigestqop">Directive</a></h2>
 292 <table class="directive">
 293 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Determines the quality-of-protection to use in digest
 294 authentication</td></tr>
 295 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestQop none|auth|auth-int [auth|auth-int]</code></td></tr>
 296 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthDigestQop auth</code></td></tr>
 297 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</td></tr>
 298 <tr><th><a href="directive-dict.html#Override">Override:</a></th><td>AuthConfig</td></tr>
 299 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 300 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 301 </table>
 302     <p>The <code class="directive">AuthDigestQop</code> directive determines
 303     the <dfn>quality-of-protection</dfn> to use. <code>auth</code> will only do
 304     authentication (username/password); <code>auth-int</code> is
 305     authentication plus integrity checking (an MD5 hash of the entity
 306     is also computed and checked); <code>none</code> will cause the module
 307     to use the old RFC-2069 digest algorithm (which does not include
 308     integrity checking). Both <code>auth</code> and <code>auth-int</code> may
 309     be specified, in which the case the browser will choose which of
 310     these to use. <code>none</code> should only be used if the browser for
 311     some reason does not like the challenge it receives otherwise.</p>
 312
 313     <div class="note">
 314       <code>auth-int</code> is not implemented yet.
 315     </div>
 316
 317 </div>
 318 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
 319 <div class="directive-section"><h2><a name="AuthDigestShmemSize" id="AuthDigestShmemSize">AuthDigestShmemSize</a> <a name="authdigestshmemsize" id="authdigestshmemsize">Directive</a></h2>
 320 <table class="directive">
 321 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The amount of shared memory to allocate for keeping track
 322 of clients</td></tr>
 323 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestShmemSize <var>size</var></code></td></tr>
 324 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthDigestShmemSize 1000</code></td></tr>
 325 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
 326 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
 327 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_auth_digest</td></tr>
 328 </table>
 329     <p>The <code class="directive">AuthDigestShmemSize</code> directive defines
 330     the amount of shared memory, that will be allocated at the server
 331     startup for keeping track of clients. Note that the shared memory
 332     segment cannot be set less than the space that is neccessary for
 333     tracking at least <em>one</em> client. This value is dependant on your
 334     system. If you want to find out the exact value, you may simply
 335     set <code class="directive">AuthDigestShmemSize</code> to the value of
 336     <code>0</code> and read the error message after trying to start the
 337     server.</p>
 338
 339     <p>The <var>size</var> is normally expressed in Bytes, but you
 340     may let the number follow a <code>K</code> or an <code>M</code> to
 341     express your value as KBytes or MBytes. For example, the following
 342     directives are all equivalent:</p>
 343
 344     <div class="example"><p><code>
 345       AuthDigestShmemSize 1048576<br />
 346       AuthDigestShmemSize 1024K<br />
 347       AuthDigestShmemSize 1M
 348     </code></p></div>
 349
 350 </div>
 351 </div>
 352 <div class="bottomlang">
 353 <p><span>Available Languages: </span><a href="../en/mod/mod_auth_digest.html" title="English">&nbsp;en&nbsp;</a> |
 354 <a href="../ko/mod/mod_auth_digest.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
 355 </div><div id="footer">
 356 <p class="apache">Copyright 2009 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>
 357 <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></div>
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