diff options
Diffstat (limited to '')
| -rw-r--r-- | docs/manual/mod/mod_authn_socache.html.en | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/docs/manual/mod/mod_authn_socache.html.en b/docs/manual/mod/mod_authn_socache.html.en new file mode 100644 index 0000000..5c85385 --- /dev/null +++ b/docs/manual/mod/mod_authn_socache.html.en @@ -0,0 +1,255 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head> +<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" /> +<!-- + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + This file is generated from xml source: DO NOT EDIT + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + --> +<title>mod_authn_socache - Apache HTTP Server Version 2.4</title> +<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> +<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> +<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" /> +<script src="../style/scripts/prettify.min.js" type="text/javascript"> +</script> + +<link href="../images/favicon.ico" rel="shortcut icon" /></head> +<body> +<div id="page-header"> +<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p> +<p class="apache">Apache HTTP Server Version 2.4</p> +<img alt="" src="../images/feather.png" /></div> +<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> +<div id="path"> +<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.4</a> > <a href="./">Modules</a></div> +<div id="page-content"> +<div id="preamble"><h1>Apache Module mod_authn_socache</h1> +<div class="toplang"> +<p><span>Available Languages: </span><a href="../en/mod/mod_authn_socache.html" title="English"> en </a> | +<a href="../fr/mod/mod_authn_socache.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p> +</div> +<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Manages a cache of authentication credentials to relieve +the load on backends</td></tr> +<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr> +<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>authn_socache_module</td></tr> +<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_authn_socache.c</td></tr> +<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Version 2.3 and later</td></tr></table> +<h3>Summary</h3> + + <p>Maintains a cache of authentication credentials, so that a new backend + lookup is not required for every authenticated request.</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="#intro">Authentication Caching</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#usage">Usage</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#dev">Caching with custom modules</a></li> +</ul><h3 class="directives">Directives</h3> +<ul id="toc"> +<li><img alt="" src="../images/down.gif" /> <a href="#authncachecontext">AuthnCacheContext</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#authncacheenable">AuthnCacheEnable</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#authncacheprovidefor">AuthnCacheProvideFor</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#authncachesocache">AuthnCacheSOCache</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#authncachetimeout">AuthnCacheTimeout</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_authn_socache">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_authn_socache">Report a bug</a></li></ul><h3>See also</h3> +<ul class="seealso"> +<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="intro" id="intro">Authentication Caching</a></h2> + <p>Some users of more heavyweight authentication such as SQL database + lookups (<code class="module"><a href="../mod/mod_authn_dbd.html">mod_authn_dbd</a></code>) have reported it putting an + unacceptable load on their authentication provider. A typical case + in point is where an HTML page contains hundreds of objects + (images, scripts, stylesheets, media, etc), and a request to the page + generates hundreds of effectively-immediate requests for authenticated + additional contents.</p> + <p><code class="module"><a href="../mod/mod_authn_socache.html">mod_authn_socache</a></code> provides a solution to this problem by + maintaining a cache of authentication credentials.</p> +</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="section"> +<h2><a name="usage" id="usage">Usage</a></h2> + <p>The authentication cache should be used where authentication + lookups impose a significant load on the server, or a backend or + network. Authentication by file (<code class="module"><a href="../mod/mod_authn_file.html">mod_authn_file</a></code>) + or dbm (<code class="module"><a href="../mod/mod_authn_dbm.html">mod_authn_dbm</a></code>) are unlikely to benefit, + as these are fast and lightweight in their own right (though in some + cases, such as a network-mounted file, caching may be worthwhile). + Other providers such as SQL or LDAP based authentication are more + likely to benefit, particularly where there is an observed + performance issue. Amongst the standard modules, <code class="module"><a href="../mod/mod_authnz_ldap.html">mod_authnz_ldap</a></code> manages its own cache, so only + <code class="module"><a href="../mod/mod_authn_dbd.html">mod_authn_dbd</a></code> will usually benefit from this cache.</p> + <p>The basic rules to cache for a provider are:</p> + <ol><li>Include the provider you're caching for in an + <code class="directive"><a href="#authncacheprovidefor">AuthnCacheProvideFor</a></code> directive.</li> + <li>List <var>socache</var> ahead of the provider you're + caching for in your <code class="directive"><a href="../mod/mod_auth_basic.html#authbasicprovider">AuthBasicProvider</a></code> or <code class="directive"><a href="../mod/mod_auth_digest.html#authdigestprovider">AuthDigestProvider</a></code> directive.</li> + </ol> + <p>A simple usage example to accelerate <code class="module"><a href="../mod/mod_authn_dbd.html">mod_authn_dbd</a></code> + using dbm as a cache engine:</p> + <pre class="prettyprint lang-config">#AuthnCacheSOCache is optional. If specified, it is server-wide +AuthnCacheSOCache dbm +<Directory "/usr/www/myhost/private"> + AuthType Basic + AuthName "Cached Authentication Example" + AuthBasicProvider socache dbd + AuthDBDUserPWQuery "SELECT password FROM authn WHERE user = %s" + AuthnCacheProvideFor dbd + Require valid-user + #Optional + AuthnCacheContext dbd-authn-example +</Directory></pre> + +</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="section"> +<h2><a name="dev" id="dev">Caching with custom modules</a></h2> + <p>Module developers should note that their modules must be enabled + for caching with <code class="module"><a href="../mod/mod_authn_socache.html">mod_authn_socache</a></code>. A single optional API function + <var>ap_authn_cache_store</var> is provided to cache credentials + a provider has just looked up or generated. Usage examples are + available in <a href="http://svn.eu.apache.org/viewvc?view=revision&revision=957072">r957072</a>, in which three authn providers are enabled for caching.</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="AuthnCacheContext" id="AuthnCacheContext">AuthnCacheContext</a> <a name="authncachecontext" id="authncachecontext">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specify a context string for use in the cache key</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthnCacheContext directory|server|<var>custom-string</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthnCacheContext directory</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory</td></tr> +<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_authn_socache</td></tr> +</table> + <p>This directive specifies a string to be used along with the supplied + username (and realm in the case of Digest Authentication) in constructing + a cache key. This serves to disambiguate identical usernames serving + different authentication areas on the server.</p> + <p>Two special values for this are <code>directory</code>, which uses + the directory context of the request as a string, and <code>server</code> + which uses the virtual host name.</p> + <p>The default is <code>directory</code>, which is also the most + conservative setting. This is likely to be less than optimal, as it + (for example) causes <var>$app-base</var>, <var>$app-base/images</var>, + <var>$app-base/scripts</var> and <var>$app-base/media</var> each to + have its own separate cache key. A better policy is to name the + <code class="directive">AuthnCacheContext</code> for the password + provider: for example a <var>htpasswd</var> file or database table.</p> + <p>Contexts can be shared across different areas of a server, where + credentials are shared. However, this has potential to become a vector + for cross-site or cross-application security breaches, so this directive + is not permitted in <var>.htaccess</var> contexts.</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="AuthnCacheEnable" id="AuthnCacheEnable">AuthnCacheEnable</a> <a name="authncacheenable" id="authncacheenable">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable Authn caching configured anywhere</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthnCacheEnable</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>Base</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_authn_socache</td></tr> +</table> + <p>This directive is not normally necessary: it is implied if + authentication caching is enabled anywhere in <var>httpd.conf</var>. + However, if it is not enabled anywhere in <var>httpd.conf</var> + it will by default not be initialised, and is therefore not + available in a <var>.htaccess</var> context. This directive + ensures it is initialised so it can be used in <var>.htaccess</var>.</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="AuthnCacheProvideFor" id="AuthnCacheProvideFor">AuthnCacheProvideFor</a> <a name="authncacheprovidefor" id="authncacheprovidefor">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specify which authn provider(s) to cache for</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthnCacheProvideFor <var>authn-provider</var> [...]</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>None</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>Base</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_authn_socache</td></tr> +</table> + <p>This directive specifies an authentication provider or providers + to cache for. Credentials found by a provider not listed in an + <code class="directive">AuthnCacheProvideFor</code> directive will not be cached.</p> + + <p>For example, to cache credentials found by <code class="module"><a href="../mod/mod_authn_dbd.html">mod_authn_dbd</a></code> + or by a custom provider <var>myprovider</var>, but leave those looked + up by lightweight providers like file or dbm lookup alone:</p> + <pre class="prettyprint lang-config">AuthnCacheProvideFor dbd myprovider</pre> + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="AuthnCacheSOCache" id="AuthnCacheSOCache">AuthnCacheSOCache</a> <a name="authncachesocache" id="authncachesocache">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Select socache backend provider to use</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthnCacheSOCache <var>provider-name[:provider-args]</var></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>Base</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_authn_socache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Optional provider arguments are available in +Apache HTTP Server 2.4.7 and later</td></tr> +</table> + <p>This is a server-wide setting to select a provider for the + <a href="../socache.html">shared object cache</a>, followed by + optional arguments for that provider. + Some possible values for <var>provider-name</var> are "dbm", "dc", + "memcache", or "shmcb", each subject to the appropriate module + being loaded. If not set, your platform's default will be used.</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="AuthnCacheTimeout" id="AuthnCacheTimeout">AuthnCacheTimeout</a> <a name="authncachetimeout" id="authncachetimeout">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Set a timeout for cache entries</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AuthnCacheTimeout <var>timeout</var> (seconds)</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AuthnCacheTimeout 300 (5 minutes)</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>Base</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_authn_socache</td></tr> +</table> + <p>Caching authentication data can be a security issue, though short-term + caching is unlikely to be a problem. Typically a good solution is to + cache credentials for as long as it takes to relieve the load on a + backend, but no longer, though if changes to your users and passwords + are infrequent then a longer timeout may suit you. The default 300 + seconds (5 minutes) is both cautious and ample to keep the load + on a backend such as dbd (SQL database queries) down.</p> + <p>This should not be confused with session timeout, which is an + entirely separate issue. However, you may wish to check your + session-management software for whether cached credentials can + "accidentally" extend a session, and bear it in mind when setting + your timeout.</p> + +</div> +</div> +<div class="bottomlang"> +<p><span>Available Languages: </span><a href="../en/mod/mod_authn_socache.html" title="English"> en </a> | +<a href="../fr/mod/mod_authn_socache.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p> +</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div> +<script type="text/javascript"><!--//--><![CDATA[//><!-- +var comments_shortname = 'httpd'; +var comments_identifier = 'http://httpd.apache.org/docs/2.4/mod/mod_authn_socache.html'; +(function(w, d) { + if (w.location.hostname.toLowerCase() == "httpd.apache.org") { + d.write('<div id="comments_thread"><\/div>'); + var s = d.createElement('script'); + s.type = 'text/javascript'; + s.async = true; + s.src = 'https://comments.apache.org/show_comments.lua?site=' + comments_shortname + '&page=' + comments_identifier; + (d.getElementsByTagName('head')[0] || d.getElementsByTagName('body')[0]).appendChild(s); + } + else { + d.write('<div id="comments_thread">Comments are disabled for this page at the moment.<\/div>'); + } +})(window, document); +//--><!]]></script></div><div id="footer"> +<p class="apache">Copyright 2023 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> +<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div><script type="text/javascript"><!--//--><![CDATA[//><!-- +if (typeof(prettyPrint) !== 'undefined') { + prettyPrint(); +} +//--><!]]></script> +</body></html>
\ No newline at end of file |