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138 lines
4.4 KiB
XML
138 lines
4.4 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
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<article>
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<!--$Id$-->
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<articleinfo>
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<title>Dynamic Zones</title>
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<authorgroup>
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<author>
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<firstname>Tom</firstname>
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<surname>Eastep</surname>
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</author>
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</authorgroup>
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<pubdate><?dbtimestamp format="Y/m/d"?></pubdate>
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<copyright>
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<year>2009</year>
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<holder>Thomas M. Eastep</holder>
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</copyright>
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<legalnotice>
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<para>Permission is granted to copy, distribute and/or modify this
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document under the terms of the GNU Free Documentation License, Version
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1.2 or any later version published by the Free Software Foundation; with
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no Invariant Sections, with no Front-Cover, and with no Back-Cover
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Texts. A copy of the license is included in the section entitled
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<quote><ulink url="GnuCopyright.htm">GNU Free Documentation
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License</ulink></quote>.</para>
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</legalnotice>
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</articleinfo>
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<section>
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<title>Overview</title>
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<para>There is sometimes a need to be able to define a zone whose members
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are unknown at compile-time. For example, you may wish to require
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authentication of internal users before allowing them access to the
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internet. When a user is authenticated, the user's IP address is added to
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the zone of users permitted web access.</para>
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<para>Shorewall provides basic support for defining such zones. This
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support is based on <ulink
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url="http://ipset.netfilter.org/">ipset</ulink>, so to use dynamic zones,
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you must have installed the <ulink
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url="http://xtables-addons.sourceforge.net/">xtables-addons</ulink>.</para>
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</section>
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<section>
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<title>Defining a Dynamic Zone</title>
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<para>A dynamic zone is defined by using the keyword dynamic in the zones
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host list.</para>
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<para>Example:</para>
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<blockquote>
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<para><filename>/etc/shorewall/zones</filename>:<programlisting>#NAME TYPE OPTIONS
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loc ipv4
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webok:loc ipv4</programlisting><filename>/etc/shorewall/interfaces</filename>:</para>
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<programlisting>#ZONE INTERFACE BROADCAST OPTIONS
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webok eth0 - hosts=dynamic</programlisting>
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</blockquote>
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<para>Once the above definition is added, Shorewall will automatically
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create an ipset named <emphasis>webok_eth0</emphasis> the next time that
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Shorewall is started or restarted. Shorewall will create an ipset of type
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<firstterm>iphash</firstterm>. If you want to use a different type of
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ipset, such as <firstterm>macipmap</firstterm>, then you will want to
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manually create that ipset yourself before the next Shorewall
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start/restart.</para>
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</section>
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<section>
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<title>Adding a Host to a Dynamic Zone</title>
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<para>Adding a host to a dynamic zone is accomplished by adding the host's
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IP address to the appropriate ipset. Shorewall provldes a command for
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doing that:</para>
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<blockquote>
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<para><command>shorewall add</command> <replaceable>interface:address
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...</replaceable> <replaceable>zone</replaceable></para>
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</blockquote>
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<para>Example:</para>
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<blockquote>
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<para><command>shorewall add eth0:192.168.3.4 webok</command></para>
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</blockquote>
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</section>
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<section>
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<title>Deleting a Host from a Dynamic Zone</title>
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<para>Deleting a host from a dynamic zone is accomplished by removing the
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host's IP address from the appropriate ipset. Shorewall provldes a command
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for doing that:</para>
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<blockquote>
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<para><command>shorewall delete</command> <replaceable>interface:address
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...</replaceable> <replaceable>zone</replaceable></para>
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</blockquote>
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<para>Example:</para>
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<blockquote>
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<para><command>shorewall delete eth0:192.168.3.4 webok</command></para>
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</blockquote>
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</section>
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<section>
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<title>Listing the Contents of a Dynamic Zone</title>
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<para>The shorewall show command may be used to list the current contents
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of a dynamic zone.</para>
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<blockquote>
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<para><command>shorewall show dynamic</command>
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<replaceable>zone</replaceable></para>
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</blockquote>
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<para>Example:</para>
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<blockquote>
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<programlisting><command>shorewall show dynamic webok</command>
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eth0:
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192.168.3.4
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192.168.3.9</programlisting>
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</blockquote>
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</section>
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</article>
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