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134 lines
4.3 KiB
XML
134 lines
4.3 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<article>
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<!--$Id$-->
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<articleinfo>
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<title>Shorewall and UPnP</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>2005-05-07</pubdate>
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<copyright>
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<year>2005</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>UPnP</title>
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<para>In Shorewall 2.2.4, support was added for UPnP (Universal Plug and
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Play) using linux-igd (<ulink
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url="http://linux-idg.sourceforge.net">http://linux-idg.sourceforge.net</ulink>).
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UPnP is required by a number of popular applications including MSN
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IM.</para>
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<warning>
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<para>From a security architecture viewpoint, UPnP is a disaster. It
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assumes that:</para>
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<orderedlist numeration="loweralpha">
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<listitem>
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<para>All local systems and their users are completely
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trustworthy.</para>
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</listitem>
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<listitem>
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<para>No local system is infected with any worm or trojan.</para>
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</listitem>
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</orderedlist>
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<para>If either of these assumptions are not true then UPnP can be used
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to totally defeat your firewall and to allow incoming connections to
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arbitrary local systems on any port whatsoever. In short: USE UPnP AT
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YOUR OWN RISK.</para>
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</warning>
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<warning>
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<para>The linux-igd project appears to be inactive and the web site does
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not display correctly on any open source browser that I've tried.
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Building and installing linux-igd is not for the faint of heart. You
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must download the source from CVS and be prepared to do quite a bit of
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fiddling with the include files from libupnp (which is required to build
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and/or run linux-igd).</para>
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</warning>
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<warning>
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<para>Before building liunx-igd, you must apply all patches found at
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<ulink
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url="http://shorewall.net/pub/shorewall/contrib/linux-igd">http://shorewall.net/pub/shorewall/contrib/linux-igd</ulink>.</para>
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</warning>
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<para></para>
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</section>
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<section>
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<title>linux-idg Configuration</title>
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<para>In /etc/upnpd.conf, you will want:</para>
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<programlisting>insert_forward_rules = yes
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prerouting_chain_name = UPnP
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forward_chain_name = forwardUPnP</programlisting>
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</section>
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<section>
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<title>Shorewall Configuration</title>
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<para>In <filename>/etc/shorewall/interfaces</filename>, you need the
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'upnp' option on your external interface.</para>
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<para>Example:</para>
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<programlisting>#ZONE INTERFACE BROADCAST OPTIONS
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net eth1 detect dhcp,routefilter,norfc1918,tcpflags,<emphasis
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role="bold">upnp</emphasis></programlisting>
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<para>If your fw->loc policy is not ACCEPT then you need this
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rule:</para>
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<programlisting>#ACTION SOURCE DEST
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allowoutUPnP fw loc</programlisting>
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<note>
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<para>To use 'allowoutUPnP', your iptables and kernel must support the
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'owner match' feature (see the output of "shorewall show
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capabilities").</para>
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</note>
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<para>If your loc->fw policy is not ACCEPT then you need this
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rule:</para>
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<programlisting>#ACTION SOURCE DEST
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allowinUPnP loc fw</programlisting>
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<para>You MUST have this rule:</para>
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<programlisting>#ACTION SOURCE DEST
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forwardUPnP net loc</programlisting>
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<para>You must also ensure that you have a route to 224.0.0.0/4 on your
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internal (local) interface as described in the linux-idg
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documentation.</para>
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</section>
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</article> |