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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="../fr/mod/mod_auth_digest.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | |
| <a href="../ko/mod/mod_auth_digest.html" hreflang="ko" rel="alternate" title="Korean"> ko </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>Extension</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 |
| (<a href="http://www.faqs.org/rfcs/rfc2617.html">RFC2617</a>), and |
| provides an alternative to <code class="module"><a href="../mod/mod_auth_basic.html">mod_auth_basic</a></code> where the |
| password is not transmitted as cleartext. However, this does |
| <strong>not</strong> lead to a significant security advantage over |
| basic authentication. On the other hand, the password storage on the |
| server is much less secure with digest authentication than with |
| basic authentication. Therefore, using basic auth and encrypting the |
| whole connection using <code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code> is a much better |
| alternative.</p> |
| </div> |
| <div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3>Topics</h3> |
| <ul id="topics"> |
| <li><img alt="" src="../images/down.gif" /> <a href="#using">Using Digest Authentication</a></li> |
| </ul><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="#authdigestnoncelifetime">AuthDigestNonceLifetime</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#authdigestprovider">AuthDigestProvider</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>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_auth_digest">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_auth_digest">Report a bug</a></li></ul><h3>See also</h3> |
| <ul class="seealso"> |
| <li><code class="directive"><a href="../mod/mod_authn_core.html#authname">AuthName</a></code></li> |
| <li><code class="directive"><a href="../mod/mod_authn_core.html#authtype">AuthType</a></code></li> |
| <li><code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code></li> |
| <li><a href="../howto/auth.html">Authentication howto</a></li> |
| <li><a href="#comments_section">Comments</a></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>To use MD5 Digest authentication, configure the location to be |
| protected as shown in the below example:</p> |
| |
| <div class="example"><h3>Example:</h3><pre class="prettyprint lang-config"><Location "/private/"> |
| AuthType Digest |
| AuthName "private area" |
| AuthDigestDomain "/private/" "http://mirror.my.dom/private2/" |
| |
| AuthDigestProvider file |
| AuthUserFile "/web/auth/.digest_pw" |
| Require valid-user |
| </Location></pre> |
| </div> |
| |
| <p><code class="directive"><a href="#authdigestdomain">AuthDigestDomain</a></code> |
| should list the locations that will be protected by this |
| configuration.</p> |
| |
| <p>The password file referenced in the <code class="directive"><a href="#authuserfile">AuthUserFile</a></code> directive may be |
| created and managed using the <code class="program"><a href="../programs/htdigest.html">htdigest</a></code> tool.</p> |
| |
| |
| <div class="note"><h3>Note</h3> |
| <p>Digest authentication was intended to be more secure than basic |
| authentication, but no longer fulfills that design goal. A |
| man-in-the-middle attacker can trivially force the browser to downgrade |
| to basic authentication. And even a passive eavesdropper can brute-force |
| the password using today's graphics hardware, because the hashing |
| algorithm used by digest authentication is too fast. Another problem is |
| that the storage of the passwords on the server is insecure. The contents |
| of a stolen htdigest file can be used directly for digest authentication. |
| Therefore using <code class="module"><a href="../mod/mod_ssl.html">mod_ssl</a></code> to encrypt the whole connection is |
| strongly recommended.</p> |
| <p><code class="module"><a href="../mod/mod_auth_digest.html">mod_auth_digest</a></code> only works properly on platforms |
| where APR supports shared memory.</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 hashes 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>Extension</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>Extension</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; 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.</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="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>Extension</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="AuthDigestProvider" id="AuthDigestProvider">AuthDigestProvider</a> <a name="authdigestprovider" id="authdigestprovider">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets the authentication provider(s) for this location</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthDigestProvider <var>provider-name</var> |
| [<var>provider-name</var>] ...</code></td></tr> |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthDigestProvider file</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>Extension</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">AuthDigestProvider</code> directive sets |
| which provider is used to authenticate the users for this location. |
| The default <code>file</code> provider is implemented |
| by the <code class="module"><a href="../mod/mod_authn_file.html">mod_authn_file</a></code> module. Make sure |
| that the chosen provider module is present in the server.</p> |
| |
| <p>See <code class="module"><a href="../mod/mod_authn_dbm.html">mod_authn_dbm</a></code>, <code class="module"><a href="../mod/mod_authn_file.html">mod_authn_file</a></code>, |
| <code class="module"><a href="../mod/mod_authn_dbd.html">mod_authn_dbd</a></code> and <code class="module"><a href="../mod/mod_authn_socache.html">mod_authn_socache</a></code> |
| for providers.</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>Extension</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>Extension</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 necessary for |
| tracking at least <em>one</em> client. This value is dependent 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 follow the number with 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> |
| |
| <pre class="prettyprint lang-config">AuthDigestShmemSize 1048576 |
| AuthDigestShmemSize 1024K |
| AuthDigestShmemSize 1M</pre> |
| |
| |
| </div> |
| </div> |
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