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-<title>mod_authz_host - Apache HTTP Server</title>
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<p class="apache">Apache HTTP Server Version 2.5</p>
-<img alt="" src="../images/feather.gif" /></div>
+<img alt="" src="../images/feather.png" /></div>
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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 2.5</a> > <a href="./">Modules</a></div>
<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>
+<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>The <code>forward-dns</code> provider was addded in 2.4.19</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
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>
+<div id="quickview"><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><h3 class="directives">Directives</h3>
+<p>This module provides no
+ directives.</p>
+<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_authz_host">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_authz_host">Report a bug</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>
+<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="requiredirectives" id="requiredirectives">The Require Directives</a></h2>
+<h2><a name="requiredirectives" id="requiredirectives">The Require Directives</a><a title="Permanent link" href="#requiredirectives" class="permalink">¶</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>ip</code> and <code>host</code>.
+ authorization types with <code>ip</code>, <code>host</code>,
+ <code>forward-dns</code> and <code>local</code>.
Other authorization types may also be
used but may require that additional authorization modules be loaded.</p>
access an area of the server. Access can be controlled by
hostname, IP Address, or IP Address range.</p>
+ <p>Since v2.4.8, <a href="../expr.html">expressions</a> are supported
+ within the host require directives.</p>
+
<h3><a name="reqip" id="reqip">Require ip</a></h3>
<p>The <code>ip</code> provider allows access to the server
<p>A full IP address:</p>
- <pre class="prettyprint lang-config">
-Require ip 10.1.2.3
-Require ip 192.168.1.104 192.168.1.205
- </pre>
+ <pre class="prettyprint lang-config">Require ip 10.1.2.3
+Require ip 192.168.1.104 192.168.1.205</pre>
<p>An IP address of a host allowed access</p>
<p>A partial IP address:</p>
- <pre class="prettyprint lang-config">
-Require ip 10.1
-Require ip 10 172.20 192.168.2
- </pre>
+ <pre class="prettyprint lang-config">Require ip 10.1
+Require ip 10 172.20 192.168.2</pre>
<p>The first 1 to 3 bytes of an IP address, for subnet
restriction.</p>
<p>A network/netmask pair:</p>
- <pre class="prettyprint lang-config">
- Require ip 10.1.0.0/255.255.0.0
- </pre>
+ <pre class="prettyprint lang-config">Require ip 10.1.0.0/255.255.0.0</pre>
<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>
- <pre class="prettyprint lang-config">
- Require ip 10.1.0.0/16
- </pre>
+ <pre class="prettyprint lang-config">Require ip 10.1.0.0/16</pre>
<p>Similar to the previous case, except the netmask consists of
nnn high-order 1 bits.</p>
<p>IPv6 addresses and IPv6 subnets can be specified as shown
below:</p>
- <pre class="prettyprint lang-config">
-Require ip 2001:db8::a00:20ff:fea7:ccea
-Require ip 2001:db8::a00:20ff:fea7:ccea/10
- </pre>
+ <pre class="prettyprint lang-config">Require ip 2001:db8::a00:20ff:fea7:ccea
+Require ip 2001:db8:1:1::a
+Require ip 2001:db8:2:1::/64
+Require ip 2001:db8:3::/48</pre>
+ <p>Note: As the IP addresses are parsed on startup, expressions are
+ not evaluated at request time.</p>
<p>A (partial) domain-name</p>
- <pre class="prettyprint lang-config">
-Require host example.org
-Require host .net example.edu
- </pre>
+ <pre class="prettyprint lang-config">Require host example.org
+Require host .net example.edu</pre>
<p>Hosts whose names match, or end in, this string are allowed
+<h3><a name="reqfwddns" id="reqfwddns">Require forward-dns</a></h3>
+
+ <p>The <code>forward-dns</code> provider allows access to the server
+ to be controlled based on simple host names. When
+ <code>Require forward-dns <var>host-name</var></code> is specified,
+ all IP addresses corresponding to <code><var>host-name</var></code>
+ are allowed access.</p>
+
+ <p>In contrast to the <code>host</code> provider, this provider does not
+ rely on reverse DNS lookups: it simply queries the DNS for the host name
+ and allows a client if its IP matches. As a consequence, it will only
+ work with host names, not domain names. However, as the reverse DNS is
+ not used, it will work with clients which use a dynamic DNS service.</p>
+
+ <pre class="prettyprint lang-config">Require forward-dns bla.example.org</pre>
+
+
+ <p>A client the IP of which is resolved from the name
+ <code>bla.example.org</code> will be granted access.</p>
+
+ <p>The <code>forward-dns</code> provider was added in 2.4.19.</p>
+
+
<h3><a name="reqlocal" id="reqlocal">Require local</a></h3>
+
<p>The <code>local</code> provider allows access to the server if any
of the following conditions is true:</p>
<p>This allows a convenient way to match connections that originate from
the local host:</p>
- <pre class="prettyprint lang-config">
- Require local
- </pre>
+ <pre class="prettyprint lang-config">Require local</pre>
+
+
+
+
+<h3><a name="proxy" id="proxy">Security Note</a></h3>
+
+ <p>If you are proxying content to your server, you need to be aware
+ that the client address will be the address of your proxy server,
+ not the address of the client, and so using the <code>Require</code>
+ directive in this context may not do what you mean. See
+ <code class="module"><a href="../mod/mod_remoteip.html">mod_remoteip</a></code> for one possible solution to this
+ problem.</p>
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