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458 lines
25 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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This file is generated from xml source: DO NOT EDIT
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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-->
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<title>Configuration Sections - Apache HTTP Server</title>
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<link href="./style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<link href="./style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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<link href="./style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" />
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<link href="./images/favicon.ico" rel="shortcut icon" /></head>
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<body id="manual-page"><div id="page-header">
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<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>
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<p class="apache">Apache HTTP Server Version 2.1</p>
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<img alt="" src="./images/feather.gif" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="./images/left.gif" /></a></div>
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<div id="path">
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs-project/">Documentation</a> > <a href="./">Version 2.1</a></div><div id="page-content"><div id="preamble"><h1>Configuration Sections</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="./en/sections.html" title="English"> en </a> |
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<a href="./ja/sections.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
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<a href="./ko/sections.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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</div>
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<p>Directives in the <a href="configuring.html">configuration files</a> may apply to the
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entire server, or they may be restricted to apply only to particular
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directories, files, hosts, or URLs. This document describes how to
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use configuration section containers or <code>.htaccess</code> files
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to change the scope of other configuration directives.</p>
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</div>
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<div id="quickview"><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#types">Types of Configuration Section Containers</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#file-and-web">Filesystem and Webspace</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#virtualhost">Virtual Hosts</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#proxy">Proxy</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#whatwhere">What Directives are Allowed?</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#mergin">How the sections are merged</a></li>
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</ul></div>
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<div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="types" id="types">Types of Configuration Section Containers</a></h2>
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<table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="./mod/core.html">core</a></code></li><li><code class="module"><a href="./mod/mod_proxy.html">mod_proxy</a></code></li></ul></td><td><ul><li><code class="directive"><a href="./mod/core.html#directory"><Directory></a></code></li><li><code class="directive"><a href="./mod/core.html#directorymatch"><DirectoryMatch></a></code></li><li><code class="directive"><a href="./mod/core.html#files"><Files></a></code></li><li><code class="directive"><a href="./mod/core.html#filesmatch"><FilesMatch></a></code></li><li><code class="directive"><a href="./mod/core.html#ifdefine"><IfDefine></a></code></li><li><code class="directive"><a href="./mod/core.html#ifmodule"><IfModule></a></code></li><li><code class="directive"><a href="./mod/core.html#location"><Location></a></code></li><li><code class="directive"><a href="./mod/core.html#locationmatch"><LocationMatch></a></code></li><li><code class="directive"><a href="./mod/mod_proxy.html#proxy"><Proxy></a></code></li><li><code class="directive"><a href="./mod/mod_proxy.html#proxymatch"><ProxyMatch></a></code></li><li><code class="directive"><a href="./mod/core.html#virtualhost"><VirtualHost></a></code></li></ul></td></tr></table>
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<p>There are two basic types of containers. Most containers are
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evaluated for each request. The enclosed directives are applied only
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for those requests that match the containers. The <code class="directive"><a href="./mod/core.html#ifdefine"><IfDefine></a></code> and <code class="directive"><a href="./mod/core.html#ifmodule"><IfModule></a></code> containers, on the
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other hand, are evaluated only at server startup and restart. If
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their conditions are true at startup, then the enclosed directives
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will apply to all requests. If the conditions are not true, the
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enclosed directives will be ignored.</p>
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<p>The <code class="directive"><a href="./mod/core.html#ifdefine"><IfDefine></a></code> directive
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encloses directives that will only be applied if an appropriate
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parameter is defined on the <code>httpd</code> command line. For example,
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with the following configuration, all requests will be redirected
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to another site only if the server is started using
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<code>httpd -DClosedForNow</code>:</p>
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<div class="example"><p><code>
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<IfDefine ClosedForNow><br />
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Redirect / http://otherserver.example.com/<br />
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</IfDefine>
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</code></p></div>
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<p>The <code class="directive"><a href="./mod/core.html#ifmodule"><IfModule></a></code>
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directive is very similar, except it encloses directives that will
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only be applied if a particular module is available in the server.
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The module must either be statically compiled in the server, or it
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must be dynamically compiled and its <code class="directive"><a href="./mod/mod_so.html#loadmodule">LoadModule</a></code> line must be earlier in the
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configuration file. This directive should only be used if you need
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your configuration file to work whether or not certain modules are
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installed. It should not be used to enclose directives that you want
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to work all the time, because it can suppress useful error messages
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about missing modules.</p>
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<p>In the following example, the <code class="directive"><a href="./mod/mod_mime_magic.html#mimemagicfiles">MimeMagicFiles</a></code> directive will be
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applied only if <code class="module"><a href="./mod/mod_mime_magic.html">mod_mime_magic</a></code> is available.</p>
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<div class="example"><p><code>
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<IfModule mod_mime_magic.c><br />
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MimeMagicFile conf/magic<br />
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</IfModule>
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</code></p></div>
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<p>Both <code class="directive"><a href="./mod/core.html#ifdefine"><IfDefine></a></code>
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and <code class="directive"><a href="./mod/core.html#ifmodule"><IfModule></a></code>
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can apply negative conditions by preceding their test with "!".
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Also, these sections can be nested to achieve more complex
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restrictions.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="file-and-web" id="file-and-web">Filesystem and Webspace</a></h2>
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<p>The most commonly used configuration section containers are the
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ones that change the configuration of particular places in the
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filesystem or webspace. First, it is important to understand the
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difference between the two. The filesystem is the view of your disks
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as seen by your operating system. For example, in a default install,
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Apache resides at <code>/usr/local/apache2</code> in the Unix
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filesystem or <code>"c:/Program Files/Apache Group/Apache2"</code> in
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the Windows filesystem. (Note that forward slashes should always be
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used as the path separator in Apache, even for Windows.) In contrast,
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the webspace is the view of your site as delivered by the web server
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and seen by the client. So the path <code>/dir/</code> in the
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webspace corresponds to the path
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<code>/usr/local/apache2/htdocs/dir/</code> in the filesystem of a
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default Apache install on Unix. The webspace need not map directly to
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the filesystem, since webpages may be generated dynamically
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from databases or other locations.</p>
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<h3><a name="filesystem" id="filesystem">Filesystem Containers</a></h3>
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<p>The <code class="directive"><a href="./mod/core.html#directory"><Directory></a></code>
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and <code class="directive"><a href="./mod/core.html#files"><Files></a></code>
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directives, along with their regex counterparts, apply directives to
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parts of the filesystem. Directives enclosed in a <code class="directive"><a href="./mod/core.html#directory"><Directory></a></code> section apply to
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the named filesystem directory and all subdirectories of that
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directory. The same effect can be obtained using <a href="howto/htaccess.html">.htaccess files</a>. For example, in the
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following configuration, directory indexes will be enabled for the
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<code>/var/web/dir1</code> directory and all subdirectories.</p>
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<div class="example"><p><code>
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<Directory /var/web/dir1><br />
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Options +Indexes<br />
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</Directory>
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</code></p></div>
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<p>Directives enclosed in a <code class="directive"><a href="./mod/core.html#files"><Files></a></code> section apply to any file with
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the specified name, regardless of what directory it lies in.
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So for example, the following configuration directives will,
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when placed in the main section of the configuration file,
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deny access to any file named <code>private.html</code> regardless
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of where it is found.</p>
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<div class="example"><p><code>
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<Files private.html><br />
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Order allow,deny<br />
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Deny from all<br />
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</Files>
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</code></p></div>
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<p>To address files found in a particular part of the filesystem, the
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<code class="directive"><a href="./mod/core.html#files"><Files></a></code> and
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<code class="directive"><a href="./mod/core.html#directory"><Directory></a></code> sections
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can be combined. For example, the following configuration will deny
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access to <code>/var/web/dir1/private.html</code>,
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<code>/var/web/dir1/subdir2/private.html</code>,
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<code>/var/web/dir1/subdir3/private.html</code>, and any other instance
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of <code>private.html</code> found under the <code>/var/web/dir1/</code>
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directory.</p>
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<div class="example"><p><code>
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<Directory /var/web/dir1><br />
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<Files private.html><br />
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Order allow,deny<br />
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Deny from all<br />
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</Files><br />
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</Directory>
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</code></p></div>
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<h3><a name="webspace" id="webspace">Webspace Containers</a></h3>
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<p>The <code class="directive"><a href="./mod/core.html#location"><Location></a></code>
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directive and its regex counterpart, on the other hand, change the
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configuration for content in the webspace. For example, the following
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configuration prevents access to any URL-path that begins in /private.
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In particular, it will apply to requests for
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<code>http://yoursite.example.com/private</code>,
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<code>http://yoursite.example.com/private123</code>, and
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<code>http://yoursite.example.com/private/dir/file.html</code> as well
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as any other requests starting with the <code>/private</code> string.</p>
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<div class="example"><p><code>
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<Location /private><br />
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Order Allow,Deny<br />
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Deny from all<br />
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</Location>
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</code></p></div>
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<p>The <code class="directive"><a href="./mod/core.html#location"><Location></a></code>
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directive need not have anything to do with the filesystem.
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For example, the following example shows how to map a particular
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URL to an internal Apache handler provided by <code class="module"><a href="./mod/mod_status.html">mod_status</a></code>.
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No file called <code>server-status</code> needs to exist in the
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filesystem.</p>
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<div class="example"><p><code>
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<Location /server-status><br />
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SetHandler server-status<br />
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</Location>
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</code></p></div>
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<h3><a name="wildcards" id="wildcards">Wildcards and Regular Expressions</a></h3>
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<p>The <code class="directive"><a href="./mod/core.html#directory"><Directory></a></code>,
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<code class="directive"><a href="./mod/core.html#files"><Files></a></code>, and
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<code class="directive"><a href="./mod/core.html#location"><Location></a></code>
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directives can each use shell-style wildcard characters as in
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<code>fnmatch</code> from the C standard library. The character "*"
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matches any sequence of characters, "?" matches any single character,
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and "[<em>seq</em>]" matches any character in <em>seq</em>. The "/"
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character will not be matched by any wildcard; it must be specified
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explicitly.</p>
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<p>If even more flexible matching is required, each
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container has a regular-expression (regex) counterpart <code class="directive"><a href="./mod/core.html#directorymatch"><DirectoryMatch></a></code>, <code class="directive"><a href="./mod/core.html#filesmatch"><FilesMatch></a></code>, and <code class="directive"><a href="./mod/core.html#locationmatch"><LocationMatch></a></code> that allow
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perl-compatible
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<a href="glossary.html#regex">regular expressions</a>
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to be used in choosing the matches. But see the section below on
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configuration merging to find out how using regex sections will change
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how directives are applied.</p>
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<p>A non-regex wildcard section that changes the configuration of
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all user directories could look as follows:</p>
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<div class="example"><p><code>
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<Directory /home/*/public_html><br />
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Options Indexes<br />
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</Directory>
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</code></p></div>
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<p>Using regex sections, we can deny access to many types of image files
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at once:</p>
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<div class="example"><p><code>
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<FilesMatch \.(?i:gif|jpe?g|png)$><br />
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Order allow,deny<br />
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Deny from all<br />
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</FilesMatch>
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</code></p></div>
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<h3><a name="whichwhen" id="whichwhen">What to use When</a></h3>
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<p>Choosing between filesystem containers and webspace containers is
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actually quite easy. When applying directives to objects that reside
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in the filesystem always use <code class="directive"><a href="./mod/core.html#directory"><Directory></a></code> or <code class="directive"><a href="./mod/core.html#files"><Files></a></code>. When applying directives to objects
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that do not reside in the filesystem (such as a webpage generated from
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a database), use <code class="directive"><a href="./mod/core.html#location"><Location></a></code>.</p>
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<p>It is important to never use <code class="directive"><a href="./mod/core.html#location"><Location></a></code> when trying to restrict
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access to objects in the filesystem. This is because many
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different webspace locations (URLs) could map to the same filesystem
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location, allowing your restrictions to be circumvented.
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For example, consider the following configuration:</p>
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<div class="example"><p><code>
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<Location /dir/><br />
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Order allow,deny<br />
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Deny from all<br />
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</Location>
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</code></p></div>
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<p>This works fine if the request is for
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<code>http://yoursite.example.com/dir/</code>. But what if you are on
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a case-insensitive filesystem? Then your restriction could be easily
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circumvented by requesting
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<code>http://yoursite.example.com/DIR/</code>. The <code class="directive"><a href="./mod/core.html#directory"><Directory></a></code> directive, in
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contrast, will apply to any content served from that location,
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regardless of how it is called. (An exception is filesystem links.
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The same directory can be placed in more than one part of the
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filesystem using symbolic links. The <code class="directive"><a href="./mod/core.html#directory"><Directory></a></code> directive will follow the symbolic
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link without resetting the pathname. Therefore, for the highest level
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of security, symbolic links should be disabled with the appropriate
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<code class="directive"><a href="./mod/core.html#options">Options</a></code> directive.)</p>
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<p>If you are, perhaps, thinking that none of this applies to you
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because you use a case-sensitive filesystem, remember that there are
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many other ways to map multiple webspace locations to the same
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filesystem location. Therefore you should always use the filesystem
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containers when you can. There is, however, one exception to this
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rule. Putting configuration restrictions in a <code><Location
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/></code> section is perfectly safe because this section will apply
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to all requests regardless of the specific URL.</p>
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|
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</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="virtualhost" id="virtualhost">Virtual Hosts</a></h2>
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<p>The <code class="directive"><a href="./mod/core.html#virtualhost"><VirtualHost></a></code>
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container encloses directives that apply to specific hosts.
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This is useful when serving multiple hosts from the same machine
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with a different configuration for each. For more information,
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see the <a href="vhosts/">Virtual Host Documentation</a>.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="proxy" id="proxy">Proxy</a></h2>
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<p>The <code class="directive"><a href="./mod/mod_proxy.html#proxy"><Proxy></a></code>
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and <code class="directive"><a href="./mod/mod_proxy.html#proxymatch"><ProxyMatch></a></code>
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containers apply enclosed configuration directives only
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to sites accessed through <code class="module"><a href="./mod/mod_proxy.html">mod_proxy</a></code>'s proxy server
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that match the specified URL. For example, the following configuration
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will prevent the proxy server from being used to access the
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<code>cnn.com</code> website.</p>
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<div class="example"><p><code>
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<Proxy http://cnn.com/*><br />
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Order allow,deny<br />
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Deny from all<br />
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</Proxy>
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</code></p></div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="whatwhere" id="whatwhere">What Directives are Allowed?</a></h2>
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<p>To find out what directives are allowed in what types of
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configuration sections, check the <a href="mod/directive-dict.html#Context">Context</a> of the directive.
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Everything that is allowed in
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<code class="directive"><a href="./mod/core.html#directory"><Directory></a></code>
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sections is also syntactically allowed in
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|
<code class="directive"><a href="./mod/core.html#directorymatch"><DirectoryMatch></a></code>,
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<code class="directive"><a href="./mod/core.html#files"><Files></a></code>,
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<code class="directive"><a href="./mod/core.html#filesmatch"><FilesMatch></a></code>,
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<code class="directive"><a href="./mod/core.html#location"><Location></a></code>,
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<code class="directive"><a href="./mod/core.html#locationmatch"><LocationMatch></a></code>,
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<code class="directive"><a href="./mod/mod_proxy.html#proxy"><Proxy></a></code>,
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and <code class="directive"><a href="./mod/mod_proxy.html#proxymatch"><ProxyMatch></a></code>
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sections. There are some exceptions, however:</p>
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<ul>
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<li>The <code class="directive"><a href="./mod/core.html#allowoverride">AllowOverride</a></code> directive
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|
works only in <code class="directive"><a href="./mod/core.html#directory"><Directory></a></code>
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sections.</li>
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<li>The <code>FollowSymLinks</code> and
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<code>SymLinksIfOwnerMatch</code> <code class="directive"><a href="./mod/core.html#options">Options</a></code> work only in <code class="directive"><a href="./mod/core.html#directory"><Directory></a></code> sections or
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<code>.htaccess</code> files.</li>
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<li>The <code class="directive"><a href="./mod/core.html#options">Options</a></code> directive cannot
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be used in <code class="directive"><a href="./mod/core.html#files"><Files></a></code>
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|
and <code class="directive"><a href="./mod/core.html#filesmatch"><FilesMatch></a></code>
|
|
sections.</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="mergin" id="mergin">How the sections are merged</a></h2>
|
|
|
|
<p>The configuration sections are applied in a very particular order.
|
|
Since this can have important effects on how configuration directives
|
|
are interpreted, it is important to understand how this works.</p>
|
|
|
|
<p>The order of merging is:</p>
|
|
|
|
<ol>
|
|
<li> <code class="directive"><a href="./mod/core.html#directory"><Directory></a></code> (except regular expressions)
|
|
and <code>.htaccess</code> done simultaneously (with
|
|
<code>.htaccess</code>, if allowed, overriding
|
|
<code class="directive"><a href="./mod/core.html#directory"><Directory></a></code>)</li>
|
|
|
|
<li><code class="directive"><a href="./mod/core.html#directorymatch"><DirectoryMatch></a></code>
|
|
(and <code><Directory ~></code>)</li>
|
|
|
|
<li><code class="directive"><a href="./mod/core.html#files"><Files></a></code> and <code class="directive"><a href="./mod/core.html#filesmatch"><FilesMatch></a></code> done
|
|
simultaneously</li>
|
|
|
|
<li><code class="directive"><a href="./mod/core.html#location"><Location></a></code>
|
|
and <code class="directive"><a href="./mod/core.html#locationmatch"><LocationMatch></a></code> done simultaneously</li>
|
|
</ol>
|
|
|
|
<p>Apart from <code class="directive"><a href="./mod/core.html#directory"><Directory></a></code>, each group is processed in
|
|
the order that they appear in the configuration files. <code class="directive"><a href="./mod/core.html#directory"><Directory></a></code> (group 1 above)
|
|
is processed in the order shortest directory component to longest.
|
|
So for example, <code><Directory /var/web/dir></code> will
|
|
be processed before <code><Directory
|
|
/var/web/dir/subdir></code>. If multiple <code class="directive"><a href="./mod/core.html#directory"><Directory></a></code> sections apply
|
|
to the same directory they are processed in the configuration file
|
|
order. Configurations included via the <code class="directive"><a href="./mod/core.html#include">Include</a></code> directive will be treated as if
|
|
they were inside the including file at the location of the
|
|
<code class="directive"><a href="./mod/core.html#include">Include</a></code> directive.</p>
|
|
|
|
<p>Sections inside <code class="directive"><a href="./mod/core.html#virtualhost"><VirtualHost></a></code> sections
|
|
are applied <em>after</em> the corresponding sections outside
|
|
the virtual host definition. This allows virtual hosts to
|
|
override the main server configuration.</p>
|
|
|
|
<p>When the request is served by <code class="module"><a href="./mod/mod_proxy.html">mod_proxy</a></code>, the
|
|
<code class="directive"><a href="./mod/mod_proxy.html#proxy"><Proxy></a></code>
|
|
container takes the place of the <code class="directive"><a href="./mod/core.html#directory"><Directory></a></code> container in the processing
|
|
order.</p>
|
|
|
|
<p>Later sections override earlier ones.</p>
|
|
|
|
<div class="note"><h3>Technical Note</h3>
|
|
There is actually a
|
|
<code><Location></code>/<code><LocationMatch></code>
|
|
sequence performed just before the name translation phase
|
|
(where <code>Aliases</code> and <code>DocumentRoots</code>
|
|
are used to map URLs to filenames). The results of this
|
|
sequence are completely thrown away after the translation has
|
|
completed.
|
|
</div>
|
|
|
|
<h3><a name="merge-examples" id="merge-examples">Some Examples</a></h3>
|
|
|
|
<p>Below is an artificial example to show the order of
|
|
merging. Assuming they all apply to the request, the directives in
|
|
this example will be applied in the order A > B > C > D >
|
|
E.</p>
|
|
|
|
<div class="example"><p><code>
|
|
<Location /><br />
|
|
E<br />
|
|
</Location><br />
|
|
<br />
|
|
<Files f.html><br />
|
|
D<br />
|
|
</Files><br />
|
|
<br />
|
|
<VirtualHost *><br />
|
|
<Directory /a/b><br />
|
|
B<br />
|
|
</Directory><br />
|
|
</VirtualHost><br />
|
|
<br />
|
|
<DirectoryMatch "^.*b$"><br />
|
|
C<br />
|
|
</DirectoryMatch><br />
|
|
<br />
|
|
<Directory /a/b><br />
|
|
A<br />
|
|
</Directory><br />
|
|
<br />
|
|
</code></p></div>
|
|
|
|
<p>For a more concrete example, consider the following. Regardless of
|
|
any access restrictions placed in <code class="directive"><a href="./mod/core.html#directory"><Directory></a></code> sections, the <code class="directive"><a href="./mod/core.html#location"><Location></a></code> section will be
|
|
evaluated last and will allow unrestricted access to the server. In
|
|
other words, order of merging is important, so be careful!</p>
|
|
|
|
<div class="example"><p><code>
|
|
<Location /><br />
|
|
Order deny,allow<br />
|
|
Allow from all<br />
|
|
</Location><br />
|
|
<br />
|
|
# Woops! This <Directory> section will have no effect<br />
|
|
<Directory /><br />
|
|
Order allow,deny<br />
|
|
Allow from all<br />
|
|
Deny from badguy.example.com<br />
|
|
</Directory>
|
|
</code></p></div>
|
|
|
|
|
|
|
|
</div></div>
|
|
<div class="bottomlang">
|
|
<p><span>Available Languages: </span><a href="./en/sections.html" title="English"> en </a> |
|
|
<a href="./ja/sections.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
|
|
<a href="./ko/sections.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
|
|
</div><div id="footer">
|
|
<p class="apache">Maintained by the <a href="http://httpd.apache.org/docs-project/">Apache HTTP Server Documentation Project</a></p>
|
|
<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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