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-<?xml version="1.0" encoding="ISO-8859-1"?>
-<!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><!--
- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
- This file is generated from xml source: DO NOT EDIT
- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
- -->
-<title>mod_access - Apache HTTP Server</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 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="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
-<p class="apache">Apache HTTP Server Version 2.0</p>
-<img alt="" src="../images/feather.gif" /></div>
-<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div>
-<div id="path">
-<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>
-<div id="page-content">
-<div id="preamble"><h1>Apache Module mod_access</h1>
-<div class="toplang">
-<p><span>Available Languages: </span><a href="../en/mod/mod_access.html" title="English">&nbsp;en&nbsp;</a> |
-<a href="../ja/mod/mod_access.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a></p>
-</div>
-<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Provides access control based on client hostname, IP
-address, or other characteristics of the client request.</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>access_module</td></tr>
-<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_access.c</td></tr>
-<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available only in versions prior to 2.1</td></tr></table>
-<h3>Summary</h3>
-
- <p>The directives provided by <code class="module"><a href="../mod/mod_access.html">mod_access</a></code> are used
- in <code class="directive"><a href="../mod/core.html#directory">&lt;Directory&gt;</a></code>,
- <code class="directive"><a href="../mod/core.html#files">&lt;Files&gt;</a></code>, and
- <code class="directive"><a href="../mod/core.html#location">&lt;Location&gt;</a></code> sections
- as well as <code><a href="core.html#accessfilename">.htaccess</a></code>
- files to control access to particular parts of the server. Access
- can be controlled based on the client hostname, IP address, or
- other characteristics of the client request, as captured in <a href="../env.html">environment variables</a>. The <code class="directive"><a href="#allow">Allow</a></code> and <code class="directive"><a href="#deny">Deny</a></code> directives are used to
- specify which clients are or are not allowed access to the server,
- while the <code class="directive"><a href="#order">Order</a></code>
- directive sets the default access state, and configures how the
- <code class="directive"><a href="#allow">Allow</a></code> and <code class="directive"><a href="#deny">Deny</a></code> directives interact with each
- other.</p>
-
- <p>Both host-based access restrictions and password-based
- authentication may be implemented simultaneously. In that case,
- the <code class="directive"><a href="../mod/core.html#satisfy">Satisfy</a></code> directive is used
- to determine how the two sets of restrictions interact.</p>
-
- <p>In general, access restriction directives apply to all
- access methods (<code>GET</code>, <code>PUT</code>,
- <code>POST</code>, etc). This is the desired behavior in most
- cases. However, it is possible to restrict some methods, while
- leaving other methods unrestricted, by enclosing the directives
- in a <code class="directive"><a href="../mod/core.html#limit">&lt;Limit&gt;</a></code> section.</p>
-</div>
-<div id="quickview"><h3 class="directives">Directives</h3>
-<ul id="toc">
-<li><img alt="" src="../images/down.gif" /> <a href="#allow">Allow</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#deny">Deny</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#order">Order</a></li>
-</ul>
-<h3>See also</h3>
-<ul class="seealso">
-<li><code class="directive"><a href="../mod/core.html#satisfy">Satisfy</a></code></li>
-<li><code class="directive"><a href="../mod/core.html#require">Require</a></code></li>
-</ul></div>
-
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="Allow" id="Allow">Allow</a> <a name="allow" id="allow">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Controls which hosts can access an area of the
-server</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code> Allow from
- all|<var>host</var>|env=<var>env-variable</var>
- [<var>host</var>|env=<var>env-variable</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>Limit</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_access</td></tr>
-</table>
-
- <p>The <code class="directive">Allow</code> directive affects which hosts can
- access an area of the server. Access can be controlled by
- hostname, IP address, IP address range, or by other
- characteristics of the client request captured in environment
- variables.</p>
-
- <p>The first argument to this directive is always
- <code>from</code>. The subsequent arguments can take three
- different forms. If <code>Allow from all</code> is specified, then
- all hosts are allowed access, subject to the configuration of the
- <code class="directive"><a href="#deny">Deny</a></code> and <code class="directive"><a href="#order">Order</a></code> directives as discussed
- below. To allow only particular hosts or groups of hosts to access
- the server, the <var>host</var> can be specified in any of the
- following formats:</p>
-
- <dl>
- <dt>A (partial) domain-name</dt>
-
- <dd>
- <div class="example"><h3>Example:</h3><p><code>
- Allow from apache.org<br />
- Allow from .net example.edu
- </code></p></div>
- <p>Hosts whose names match, or end in, this string are allowed
- access. Only complete components are matched, so the above
- example will match <code>foo.apache.org</code> but it will not
- match <code>fooapache.org</code>. This configuration will cause
- Apache to perform a double reverse DNS lookup on the client IP
- address, regardless of the setting of the <code class="directive"><a href="../mod/core.html#hostnamelookups">HostnameLookups</a></code> directive. It will do
- a reverse DNS lookup on the IP address to find the associated
- hostname, and then do a forward lookup on the hostname to assure
- that it matches the original IP address. Only if the forward
- and reverse DNS are consistent and the hostname matches will
- access be allowed.</p></dd>
-
- <dt>A full IP address</dt>
-
- <dd>
- <div class="example"><h3>Example:</h3><p><code>
- Allow from 10.1.2.3<br />
- Allow from 192.168.1.104 192.168.1.205
- </code></p></div>
- <p>An IP address of a host allowed access</p></dd>
-
- <dt>A partial IP address</dt>
-
- <dd>
- <div class="example"><h3>Example:</h3><p><code>
- Allow from 10.1<br />
- Allow from 10 172.20 192.168.2
- </code></p></div>
- <p>The first 1 to 3 bytes of an IP address, for subnet
- restriction.</p></dd>
-
- <dt>A network/netmask pair</dt>
-
- <dd>
- <div class="example"><h3>Example:</h3><p><code>
- Allow from 10.1.0.0/255.255.0.0
- </code></p></div>
- <p>A network a.b.c.d, and a netmask w.x.y.z. For more
- fine-grained subnet restriction.</p></dd>
-
- <dt>A network/nnn CIDR specification</dt>
-
- <dd>
- <div class="example"><h3>Example:</h3><p><code>
- Allow from 10.1.0.0/16
- </code></p></div>
- <p>Similar to the previous case, except the netmask consists of
- nnn high-order 1 bits.</p></dd>
- </dl>
-
- <p>Note that the last three examples above match exactly the
- same set of hosts.</p>
-
- <p>IPv6 addresses and IPv6 subnets can be specified as shown
- below:</p>
-
- <div class="example"><p><code>
- Allow from 2001:db8::a00:20ff:fea7:ccea<br />
- Allow from 2001:db8::a00:20ff:fea7:ccea/10
- </code></p></div>
-
- <p>The third format of the arguments to the
- <code class="directive">Allow</code> directive allows access to the server
- to be controlled based on the existence of an <a href="../env.html">environment variable</a>. When <code>Allow from
- env=<var>env-variable</var></code> is specified, then the request is
- allowed access if the environment variable <var>env-variable</var>
- exists. The server provides the ability to set environment
- variables in a flexible way based on characteristics of the client
- request using the directives provided by
- <code class="module"><a href="../mod/mod_setenvif.html">mod_setenvif</a></code>. Therefore, this directive can be
- used to allow access based on such factors as the clients
- <code>User-Agent</code> (browser type), <code>Referer</code>, or
- other HTTP request header fields.</p>
-
- <div class="example"><h3>Example:</h3><p><code>
- SetEnvIf User-Agent ^KnockKnock/2\.0 let_me_in<br />
- &lt;Directory /docroot&gt;<br />
- <span class="indent">
- Order Deny,Allow<br />
- Deny from all<br />
- Allow from env=let_me_in<br />
- </span>
- &lt;/Directory&gt;
- </code></p></div>
-
- <p>In this case, browsers with a user-agent string beginning
- with <code>KnockKnock/2.0</code> will be allowed access, and all
- others will be denied.</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="Deny" id="Deny">Deny</a> <a name="deny" id="deny">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Controls which hosts are denied access to the
-server</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code> Deny from all|<var>host</var>|env=<var>env-variable</var>
-[<var>host</var>|env=<var>env-variable</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>Limit</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_access</td></tr>
-</table>
- <p>This directive allows access to the server to be restricted
- based on hostname, IP address, or environment variables. The
- arguments for the <code class="directive">Deny</code> directive are
- identical to the arguments for the <code class="directive"><a href="#allow">Allow</a></code> directive.</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="Order" id="Order">Order</a> <a name="order" id="order">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Controls the default access state and the order in which
-<code class="directive">Allow</code> and <code class="directive">Deny</code> are
-evaluated.</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code> Order <var>ordering</var></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>Order Deny,Allow</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>Limit</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_access</td></tr>
-</table>
-
- <p>The <code class="directive">Order</code> directive, along with the
- <code class="directive"><a href="#allow">Allow</a></code> and <code class="directive"><a href="#deny">Deny</a></code> directives, controls a
- three-pass access control system. The first pass processes either
- all <code class="directive"><a href="#allow">Allow</a></code> or all
- <code class="directive"><a href="#deny">Deny</a></code> directives, as
- specified by the <code class="directive">Order</code> directive. The second
- pass parses the rest of the directives (<code class="directive"><a href="#deny">Deny</a></code> or <code class="directive"><a href="#allow">Allow</a></code>). The third pass applies to
- all requests which do not match either of the first two.</p>
-
- <p>Note that all <code class="directive"><a href="#allow">Allow</a></code>
- and <code class="directive"><a href="#deny">Deny</a></code> directives are
- processed, unlike a typical firewall, where only the first match is
- used. The last match is effective (also unlike a typical firewall).
- Additionally, the order in which lines appear in the configuration
- files is not significant -- all <code class="directive"><a href="#allow">Allow</a></code> lines are processed as one
- group, all <code class="directive"><a href="#deny">Deny</a></code> lines are
- considered as another, and the default state is considered by
- itself.</p>
-
- <p><em>Ordering</em> is one of:</p>
-
- <dl>
- <dt><code>Allow,Deny</code></dt>
-
- <dd>First, all <code class="directive"><a href="#allow">Allow</a></code>
- directives are evaluated; at least one must match, or the request
- is rejected. Next, all <code class="directive"><a href="#deny">Deny</a></code> directives are evaluated. If
- any matches, the request is rejected. Last, any requests which do
- not match an <code class="directive"><a href="#allow">Allow</a></code> or a
- <code class="directive"><a href="#deny">Deny</a></code> directive are
- denied by default.</dd>
-
- <dt><code>Deny,Allow</code></dt>
-
- <dd>First, all <code class="directive"><a href="#deny">Deny</a></code>
- directives are evaluated; if any match, the request is denied
- <strong>unless</strong> it also matches an <code class="directive"><a href="#allow">Allow</a></code> directive. Any requests
- which do not match any <code class="directive"><a href="#allow">Allow</a></code> or <code class="directive"><a href="#deny">Deny</a></code> directives are
- permitted.</dd>
-
- <dt><code>Mutual-failure</code></dt>
-
- <dd>This order has the same effect as <code>Order
- Allow,Deny</code> and is deprecated in its favor.</dd>
- </dl>
-
- <p>Keywords may only be separated by a comma; <em>no whitespace</em>
- is allowed between them.</p>
-
- <table class="bordered">
- <tr>
- <th>Match</th>
- <th>Allow,Deny result</th>
- <th>Deny,Allow result</th>
- </tr><tr>
- <th>Match Allow only</th>
- <td>Request allowed</td>
- <td>Request allowed</td>
- </tr><tr>
- <th>Match Deny only</th>
- <td>Request denied</td>
- <td>Request denied</td>
- </tr><tr>
- <th>No match</th>
- <td>Default to second directive: Denied</td>
- <td>Default to second directive: Allowed</td>
- </tr><tr>
- <th>Match both Allow &amp; Deny</th>
- <td>Final match controls: Denied</td>
- <td>Final match controls: Allowed</td>
- </tr>
- </table>
-
- <p>In the following example, all hosts in the apache.org domain
- are allowed access; all other hosts are denied access.</p>
-
- <div class="example"><p><code>
- Order Deny,Allow<br />
- Deny from all<br />
- Allow from apache.org
- </code></p></div>
-
- <p>In the next example, all hosts in the apache.org domain are
- allowed access, except for the hosts which are in the foo.apache.org
- subdomain, who are denied access. All hosts not in the apache.org
- domain are denied access because the default state is to <code class="directive"><a href="#deny">Deny</a></code> access to the server.</p>
-
- <div class="example"><p><code>
- Order Allow,Deny<br />
- Allow from apache.org<br />
- Deny from foo.apache.org
- </code></p></div>
-
- <p>On the other hand, if the <code class="directive">Order</code> in the
- last example is changed to <code>Deny,Allow</code>, all hosts will
- be allowed access. This happens because, regardless of the actual
- ordering of the directives in the configuration file, the
- <code>Allow from apache.org</code> will be evaluated last and will
- override the <code>Deny from foo.apache.org</code>. All hosts not in
- the <code>apache.org</code> domain will also be allowed access
- because the default state is <code class="directive"><a href="#allow">Allow</a></code>.</p>
-
- <p>The presence of an <code class="directive">Order</code> directive can
- affect access to a part of the server even in the absence of
- accompanying <code class="directive"><a href="#allow">Allow</a></code> and
- <code class="directive"><a href="#deny">Deny</a></code> directives because
- of its effect on the default access state. For example,</p>
-
- <div class="example"><p><code>
- &lt;Directory /www&gt;<br />
- <span class="indent">
- Order Allow,Deny<br />
- </span>
- &lt;/Directory&gt;
- </code></p></div>
-
- <p>will <code class="directive"><a href="#deny">Deny</a></code> all access
- to the <code>/www</code> directory because the default access state
- is set to <code class="directive"><a href="#deny">Deny</a></code>.</p>
-
- <p>The <code class="directive">Order</code> directive controls the order of
- access directive processing only within each phase of the server's
- configuration processing. This implies, for example, that an
- <code class="directive"><a href="#allow">Allow</a></code> or <code class="directive"><a href="#deny">Deny</a></code> directive occurring in a
- <code class="directive"><a href="../mod/core.html#location">&lt;Location&gt;</a></code> section
- will always be evaluated after an <code class="directive"><a href="#allow">Allow</a></code> or <code class="directive"><a href="#deny">Deny</a></code> directive occurring in a
- <code class="directive"><a href="../mod/core.html#directory">&lt;Directory&gt;</a></code>
- section or <code>.htaccess</code> file, regardless of the setting of
- the <code class="directive">Order</code> directive. For details on the
- merging of configuration sections, see the documentation on <a href="../sections.html">How Directory, Location and Files sections
- work</a>.</p>
-
-</div>
-</div>
-<div class="bottomlang">
-<p><span>Available Languages: </span><a href="../en/mod/mod_access.html" title="English">&nbsp;en&nbsp;</a> |
-<a href="../ja/mod/mod_access.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a></p>
-</div><div id="footer">
-<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>
-<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>
-</body></html> \ No newline at end of file