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<?xml version="1.0" encoding="ISO-8859-1"?>
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<title>mod_authz_host - Apache HTTP Server</title>
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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/">Documentation</a> > <a href="../">Version 2.3</a> > <a href="./">Modules</a></div>
<div id="page-content">
<div id="preamble"><h1>Apache Module mod_authz_host</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_authz_host.html" title="English"> en </a> |
<a href="../fr/mod/mod_authz_host.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p>
</div>
<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Group authorizations based on host (name or IP
address)</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>authz_host_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mod_authz_host.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3 and later</td></tr></table>
<h3>Summary</h3>
<p>The authorization providers implemented by <code class="module"><a href="../mod/mod_authz_host.html">mod_authz_host</a></code> are
registered using the <code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code>
directive. The directive can be referenced within a
<code class="directive"><a href="../mod/core.html#directory"><Directory></a></code>,
<code class="directive"><a href="../mod/core.html#files"><Files></a></code>,
or <code class="directive"><a href="../mod/core.html#location"><Location></a></code> section
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>.</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"><Limit></a></code> section.</p>
</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<p>This module provides no
directives.</p>
<h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="../images/down.gif" /> <a href="#requiredirectives">The Require Directives</a></li>
</ul><h3>See also</h3>
<ul class="seealso">
<li><a href="../howto/auth.html">Authentication, Authorization,
and Access Control</a></li>
<li><code class="directive"><a href="../mod/mod_authz_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="section">
<h2><a name="requiredirectives" id="requiredirectives">The Require Directives</a></h2>
<p>Apache's <code class="directive"><a href="../mod/mod_authz_core.html#require">Require</a></code>
directive is used during the authorization phase to ensure that a user is allowed or
denied access to a resource. mod_authz_host extends the
authorization types with <code>env</code>, <code>ip</code>,
<code>host</code> and <code>all</code>. Other authorization types may also be
used but may require that additional authorization modules be loaded.</p>
<p>These authorization providers affect 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>
<h3><a name="reqenv" id="reqenv">Require env</a></h3>
<p>The <code>env</code> provider allows access to the server
to be controlled based on the existence of an <a href="../env.html">environment variable</a>. When <code>Require
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 />
<Directory /docroot><br />
<span class="indent">
Require env let_me_in<br />
</span>
</Directory>
</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>
<h3><a name="reqip" id="reqip">Require ip</a></h3>
<p>The <code>ip</code> provider allows access to the server
to be controlled based on the IP address of the remote client.
When <code>Require ip <var>ip-address</var></code> is specified,
then the request is allowed access if the IP address matches.</p>
<p>A full IP address:</p>
<div class="example"><p><code>
Require ip 10.1.2.3<br />
Require ip 192.168.1.104 192.168.1.205
</code></p></div>
<p>An IP address of a host allowed access</p>
<p>A partial IP address:</p>
<div class="example"><p><code>
Require ip 10.1<br />
Require ip 10 172.20 192.168.2
</code></p></div>
<p>The first 1 to 3 bytes of an IP address, for subnet
restriction.</p>
<p>A network/netmask pair:</p>
<div class="example"><p><code>
Require ip 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>
<p>A network/nnn CIDR specification:</p>
<div class="example"><p><code>
Require ip 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>
<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>
Require ip 2001:db8::a00:20ff:fea7:ccea<br />
Require ip 2001:db8::a00:20ff:fea7:ccea/10
</code></p></div>
<h3><a name="reqhost" id="reqhost">Require host</a></h3>
<p>The <code>host</code> provider allows access to the server
to be controlled based on the host name of the remote client.
When <code>Require host <var>host-name</var></code> is specified,
then the request is allowed access if the host name matches.</p>
<p>A (partial) domain-name</p>
<div class="example"><p><code>
Require host apache.org<br />
Require host .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>
<h3><a name="reqall" id="reqall">Require all</a></h3>
<p>The <code>all</code> provider mimics the functionality the
was previously provided by the 'Allow from all' and 'Deny from all'
directives. This provider can take one of two arguments which are
'granted' or 'denied'. The following examples will grant or deny
access to all requests.</p>
<div class="example"><p><code>
Require all granted<br />
</code></p></div>
<div class="example"><p><code>
Require all denied<br />
</code></p></div>
</div>
</div>
<div class="bottomlang">
<p><span>Available Languages: </span><a href="../en/mod/mod_authz_host.html" title="English"> en </a> |
<a href="../fr/mod/mod_authz_host.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p>
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<p class="apache">Copyright 2010 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>
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