2009-08-01 04:37:24 +02:00
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<?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>My Network Configuration</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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2009-08-02 18:28:26 +02:00
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<caution>
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<para>The ruleset shown in this article uses Shorewall features that are
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not available in Shorewall versions prior to 4.4.0.</para>
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</caution>
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2009-08-01 04:37:24 +02:00
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<section>
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<title>Introduction</title>
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<para>The configuration described in this article represents the network
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at shorewall.net during the summer of 2009. It uses the following
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Shorewall features:</para>
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<itemizedlist>
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<listitem>
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<para><ulink url="MultiISP.html">Two Internet
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Interfaces</ulink></para>
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</listitem>
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<listitem>
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<para>A DMZ with two "systems" using <ulink url="ProxyARP.htm">Proxy
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ARP</ulink> and running in <ulink url="OpenVZ.html">OpenVZ Virtual
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Environments</ulink></para>
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</listitem>
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<listitem>
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<para><ulink url="6to4.htm">IPv6 Access through a 6to4
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Tunnel</ulink></para>
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</listitem>
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<listitem>
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<para><ulink url="OPENVPN.html">OpenVPN</ulink> and <ulink
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url="IPSEC-2.6.html">IPSEC</ulink> for access when we are on the
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road.</para>
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</listitem>
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<listitem>
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<para><ulink url="ipsets.html">Ipsets</ulink></para>
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</listitem>
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<listitem>
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<para><ulink url="Dynamic.html">Dynamic Zones</ulink></para>
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</listitem>
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<listitem>
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<para><ulink url="Shorewall_Squid_Usage.html">Transparent proxy using
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Squid</ulink></para>
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</listitem>
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<listitem>
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<para><ulink url="ManualChains.html">Manual Chains</ulink></para>
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</listitem>
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2009-08-02 17:36:29 +02:00
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<listitem>
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<para><ulink url="traffic_shaping.htm">Traffic Shaping</ulink></para>
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</listitem>
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2009-08-01 04:37:24 +02:00
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</itemizedlist>
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<para>Linux runs the firewall and the servers (although they run in OpenVZ
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containers on the firewall system). Linux is not used natively on any of
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our other systems except for an <ulink url="???">HP mini which runs HP
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Mobile Internet Experience (MIE)</ulink> -- essentially Ubuntu Hardy. I
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rather run Windows natively (either Vista Home Premium or XP Professional)
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and run Linux in VMs under <ulink
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url="http://www.sun.com/software/products/virtualbox/">VirtualBox</ulink>.
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This approach has a number of advantages:</para>
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<orderedlist>
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<listitem>
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<para>Efficient disk utilization.</para>
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<para>The virtual disks used by Linux are just files in the NTFS file
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system. There is no need to pre-allocate one or more partitions for
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use by Linux. Some large applications, like Google Earth, are
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installed only on Windows.</para>
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</listitem>
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<listitem>
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<para>Avoids proprietary hardware issues.</para>
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<para>The Linux VMs emulate standard hardware that is well-supported
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by Linux.</para>
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</listitem>
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<listitem>
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<para>Avoids DRM hassles</para>
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<para>All DRM-protected media can be handled under Windows.</para>
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</listitem>
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2009-08-03 22:23:34 +02:00
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<listitem>
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<para>Websites that don't work with Firefox (or at least with Linux
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Firefox)</para>
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</listitem>
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2009-08-01 04:37:24 +02:00
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</orderedlist>
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<para>VirtualBox is fast (when your processor supports virtualization
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extensions) and very easy to use. I highly recommend it!</para>
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</section>
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<section>
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<title>Network Topology</title>
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<para>Our network is diagrammed in the following graphic.</para>
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<graphic fileref="images/Network2009d.png" />
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<para>We have accounts with two different ISPs:</para>
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<orderedlist>
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<listitem>
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<para>Comcast</para>
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<para>This is a high-speed (20mb/4mb) link with a single dynamic IPv4
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address. We are not allowed to run servers accessible through this
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account.</para>
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</listitem>
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<listitem>
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<para>Avvanta</para>
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<para>This is a low-speec (1.5mb/384kbit) link with five static IP
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address. Our servers are accessed through this account.</para>
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</listitem>
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</orderedlist>
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<para>The wired local network is restricted to my home office. The
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wireless network is managed by a Linksys WRT300N pre-N router which we use
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only as an access point -- its WAN interface is unused and it is
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configured to not do NAT. The wireless network uses WPA2 personal security
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and MAC filtering is enabled in the router. These two factors make it a
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hassle when guests visit with a laptop but provide good security for the
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network.</para>
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</section>
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<section>
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<title>Shorewall Configuration</title>
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<para>This section contains exerpts from the Shorewall
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configuration.</para>
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<para>It is important to keep in mind that parts of my configuration are
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there just to provide a test bed for Shorewall features. So while they
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show correct usage, they don't necessarily provide any useful benefit. I
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have tried to point those out in the sub-sections that follow.</para>
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2009-08-01 16:56:31 +02:00
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<section id="params">
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2009-08-01 04:37:24 +02:00
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<title>/etc/shorewall/params</title>
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<para><programlisting>MIRRORS=62.216.169.37,\
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63.229.2.114,\
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...
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NTPSERVERS=...
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POPSERVERS=...
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LOG=ULOG
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INT_IF=eth1
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EXT_IF=eth2
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COM_IF=eth0
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VPS_IF=venet0</programlisting>As shown, this file defines variables to hold
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the various lists of IP addresses that I need to maintain. To simplify
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network reconfiguration, I also use variables to define the log level
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and the network interfaces.</para>
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</section>
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2009-08-01 16:56:31 +02:00
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<section id="conf">
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2009-08-01 04:37:24 +02:00
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<title>/etc/shorewall/shorewall.conf</title>
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<para><programlisting>###############################################################################
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# S T A R T U P E N A B L E D
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###############################################################################
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STARTUP_ENABLED=Yes
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###############################################################################
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# V E R B O S I T Y
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###############################################################################
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VERBOSITY=0
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###############################################################################
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# C O M P I L E R
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# (setting this to 'perl' requires installation of Shorewall-perl)
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###############################################################################
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SHOREWALL_COMPILER=perl
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###############################################################################
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# L O G G I N G
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###############################################################################
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LOGFILE=/var/log/ulog/syslogemu.log
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STARTUP_LOG=/var/log/shorewall-init.log
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LOG_VERBOSITY=2
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LOGFORMAT="%s:%s:"
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LOGTAGONLY=No
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LOGRATE=
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LOGBURST=
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LOGALLNEW=
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BLACKLIST_LOGLEVEL=
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MACLIST_LOG_LEVEL=
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TCP_FLAGS_LOG_LEVEL=$LOG
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SMURF_LOG_LEVEL=$LOG
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LOG_MARTIANS=No
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###############################################################################
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# L O C A T I O N O F F I L E S A N D D I R E C T O R I E S
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###############################################################################
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IPTABLES=
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IPSET=
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PATH=/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin
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SHOREWALL_SHELL=/bin/sh
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SUBSYSLOCK=
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MODULESDIR=
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CONFIG_PATH=/etc/shorewall:/usr/share/shorewall
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RESTOREFILE=
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IPSECFILE=zones
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LOCKFILE=
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###############################################################################
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# D E F A U L T A C T I O N S / M A C R O S
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###############################################################################
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DROP_DEFAULT="Drop"
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REJECT_DEFAULT="Reject"
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ACCEPT_DEFAULT="none"
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QUEUE_DEFAULT="none"
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###############################################################################
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# R S H / R C P C O M M A N D S
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###############################################################################
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RSH_COMMAND='ssh ${root}@${system} ${command}'
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RCP_COMMAND='scp ${files} ${root}@${system}:${destination}'
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###############################################################################
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# F I R E W A L L O P T I O N S
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###############################################################################
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IP_FORWARDING=Yes
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ADD_IP_ALIASES=No
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ADD_SNAT_ALIASES=No
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RETAIN_ALIASES=No
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TC_ENABLED=Internal
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TC_EXPERT=No
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CLEAR_TC=Yes
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MARK_IN_FORWARD_CHAIN=Yes
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CLAMPMSS=Yes
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ROUTE_FILTER=No
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DETECT_DNAT_IPADDRS=Yes
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MUTEX_TIMEOUT=60
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ADMINISABSENTMINDED=Yes
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BLACKLISTNEWONLY=Yes
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DELAYBLACKLISTLOAD=No
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MODULE_SUFFIX=ko
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DONT_LOAD=
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DISABLE_IPV6=No
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BRIDGING=No
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DYNAMIC_ZONES=No
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PKTTYPE=No
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MACLIST_TABLE=mangle
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MACLIST_TTL=60
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SAVE_IPSETS=No
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MAPOLDACTIONS=No
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FASTACCEPT=No
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IMPLICIT_CONTINUE=Yes
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HIGH_ROUTE_MARKS=Yes
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USE_ACTIONS=Yes
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OPTIMIZE=1
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EXPORTPARAMS=Yes
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EXPAND_POLICIES=Yes
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KEEP_RT_TABLES=No
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DELETE_THEN_ADD=No
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MULTICAST=Yes
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AUTO_COMMENT=Yes
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MANGLE_ENABLED=Yes
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NULL_ROUTE_RFC1918=Yes
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USE_DEFAULT_RT=No
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RESTORE_DEFAULT_ROUTE=No
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FAST_STOP=Yes
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AUTOMAKE=No
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LOG_MARTIANS=Yes
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WIDE_TC_MARKS=Yes
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###############################################################################
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# P A C K E T D I S P O S I T I O N
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###############################################################################
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BLACKLIST_DISPOSITION=DROP
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MACLIST_DISPOSITION=ACCEPT
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TCP_FLAGS_DISPOSITION=DROP
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</programlisting>I don't believe that there is anything remarkable
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there</para>
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</section>
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2009-08-02 18:28:26 +02:00
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<section>
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<title>/etc/shorewall/actions</title>
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<para><programlisting>#ACTION
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Mirrors # Accept traffic from Shorewall Mirrors
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</programlisting>I make this into an action so the rather long list of rules
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go into their own chain.</para>
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</section>
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<section>
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|
<title>/etc/shorewall/action.Mirrors</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#TARGET SOURCE DEST PROTO DEST SOURCE ORIGINAL RATE
|
|
|
|
|
# PORT PORT(S) DEST LIMIT
|
|
|
|
|
COMMENT Accept traffic from Mirrors
|
|
|
|
|
ACCEPT $MIRRORS
|
|
|
|
|
</programlisting>See the <link linkend="rules">rules</link> file -- this
|
|
|
|
|
action is used for rsync traffic.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="zones">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/zones</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>fw firewall
|
|
|
|
|
loc ipv4 #Local Zone
|
|
|
|
|
dmz ipv4 #DMZ
|
|
|
|
|
net ipv4 #Internet
|
|
|
|
|
vpn:loc,net ipsec #IPSEC
|
|
|
|
|
drct:loc ipv4 #Direct internet access</programlisting>The
|
|
|
|
|
<emphasis role="bold">vpn</emphasis> zone is mostly for testing
|
|
|
|
|
Shorewall IPSEC support. It is nested in <emphasis
|
|
|
|
|
role="bold">loc</emphasis> and <emphasis role="bold">net</emphasis> to
|
|
|
|
|
test a feature added in Shorewall 4.4.0. The <emphasis
|
|
|
|
|
role="bold">drct</emphasis> zone is a dynamic zone whose members bypass
|
|
|
|
|
the transparent proxy. Some applications (such as VirtualBox
|
|
|
|
|
registration) don't work through the proxy.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="interfaces">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/interfaces</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#ZONE INTERFACE BROADCAST OPTIONS
|
|
|
|
|
loc $INT_IF detect dhcp,logmartians=1,routefilter=1,tcpflags
|
|
|
|
|
dmz $VPS_IF detect logmartians=1,routefilter=0,routeback
|
|
|
|
|
net $EXT_IF detect dhcp,blacklist,tcpflags,optional,routefilter=0,nosmurfs,logmartians=0,proxyarp=1
|
|
|
|
|
net $COM_IF detect dhcp,blacklist,tcpflags,optional,upnp,routefilter=0,nosmurfs,logmartians=0
|
|
|
|
|
loc tun+ detect</programlisting>Notice that VPN clients are treated
|
|
|
|
|
the same as local hosts.</para>
|
2009-08-01 16:56:31 +02:00
|
|
|
|
|
|
|
|
<para>I set the <emphasis role="bold">proxyarp</emphasis> option on
|
2009-08-02 17:36:29 +02:00
|
|
|
$EXT_IF so that</para>
|
2009-08-01 16:56:31 +02:00
|
|
|
|
|
|
|
|
<orderedlist numeration="loweralpha">
|
|
|
|
|
<listitem>
|
|
|
|
|
<para>The firewall will respond to ARP who-has requests for the
|
|
|
|
|
servers in the DMZ.</para>
|
|
|
|
|
</listitem>
|
|
|
|
|
|
|
|
|
|
<listitem>
|
|
|
|
|
<para>To keep OpenVZ happy (it issues dire warnings if the option is
|
|
|
|
|
not set on the associated external interface).</para>
|
|
|
|
|
</listitem>
|
|
|
|
|
</orderedlist>
|
2009-08-01 04:37:24 +02:00
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="hosts">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/hosts</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#ZONE HOST(S) OPTIONS
|
|
|
|
|
vpn $EXT_IF:0.0.0.0/0
|
|
|
|
|
vpn $COM_IF:0.0.0.0/0
|
|
|
|
|
vpn $INT_IF:0.0.0.0/0
|
|
|
|
|
drct $INT_IF:dynamic</programlisting>The <emphasis
|
|
|
|
|
role="bold">vpn</emphasis> zone includes ipsec hosts interfacing from
|
|
|
|
|
either external interface as well as the local interface. <emphasis
|
|
|
|
|
role="bold">drct</emphasis> is defined as dynamic through the local
|
|
|
|
|
interface (recall that it is a sub-zone of <emphasis
|
|
|
|
|
role="bold">loc</emphasis>).</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="policy">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/policy</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#SOURCE DEST POLICY LOG LIMIT:BURST
|
|
|
|
|
# LEVEL
|
|
|
|
|
$FW dmz REJECT $LOG
|
|
|
|
|
$FW all ACCEPT
|
|
|
|
|
loc net ACCEPT -
|
|
|
|
|
loc fw ACCEPT
|
|
|
|
|
loc vpn ACCEPT
|
|
|
|
|
vpn fw ACCEPT
|
|
|
|
|
vpn loc ACCEPT
|
|
|
|
|
net net NONE
|
|
|
|
|
net all DROP $LOG 8/sec:30
|
|
|
|
|
dmz fw REJECT $LOG
|
|
|
|
|
all fw DROP $LOG
|
|
|
|
|
all all REJECT $LOG</programlisting>I'm a bit
|
|
|
|
|
sloppy with my fw<->loc policies -- I should fix that
|
|
|
|
|
someday...</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="accounting">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/accounting</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#ACTION CHAIN SOURCE DESTINATION PROTO DEST SOURCE USER/
|
|
|
|
|
# PORT(S) PORT(S) GROUP
|
|
|
|
|
hp:COUNT accounting $COM_IF $INT_IF:172.20.1.107 UDP
|
|
|
|
|
hp:COUNT accounting $INT_IF:172.20.1.107 $COM_IF UDP
|
|
|
|
|
DONE hp
|
|
|
|
|
|
|
|
|
|
mail:COUNT - $EXT_IF $VPS_IF:206.124.146.0/24 tcp 25
|
|
|
|
|
mail:COUNT - $VPS_IF:206.124.146.0/24 $EXT_IF tcp 25
|
|
|
|
|
DONE mail
|
|
|
|
|
|
|
|
|
|
web - $EXT_IF $VPS_IF:206.124.146.0/24 tcp 80
|
|
|
|
|
web - $EXT_IF $VPS_IF:206.124.146.0/24 tcp 443
|
|
|
|
|
web - $VPS_IF:206.124.146.0/24 $EXT_IF tcp - 80
|
|
|
|
|
web - $VPS_IF:206.124.146.0/24 $EXT_IF tcp - 443
|
|
|
|
|
|
|
|
|
|
COUNT web $EXT_IF $VPS_IF:206.124.146.0/24
|
|
|
|
|
COUNT web $VPS_IF:206.124.146.0/24 $EXT_IF
|
|
|
|
|
</programlisting>The accounting chains are as follows:</para>
|
|
|
|
|
|
|
|
|
|
<orderedlist>
|
|
|
|
|
<listitem>
|
|
|
|
|
<para>hp</para>
|
|
|
|
|
|
|
|
|
|
<para>Counts traffic to/from my work laptop to HP. The VPN users
|
|
|
|
|
NAT-Traversal (UDP 4500) so I just count all UDP traffic to/from my
|
|
|
|
|
work system.</para>
|
|
|
|
|
</listitem>
|
|
|
|
|
|
|
|
|
|
<listitem>
|
|
|
|
|
<para>mail</para>
|
|
|
|
|
|
|
|
|
|
<para>Incoming and outgoing email</para>
|
|
|
|
|
</listitem>
|
|
|
|
|
|
|
|
|
|
<listitem>
|
|
|
|
|
<para>web</para>
|
|
|
|
|
|
|
|
|
|
<para>Website traffic (both HTTP and HTTPS)</para>
|
|
|
|
|
</listitem>
|
|
|
|
|
</orderedlist>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="blacklist">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/blacklist</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#ADDRESS/SUBNET PROTOCOL PORT
|
|
|
|
|
- udp 1024:1033,1434
|
|
|
|
|
- tcp 57,1433,1434,2401,2745,3127,3306,3410,4899,5554,6101,8081,9898</programlisting>This
|
|
|
|
|
configuration silently drops a few ports that get lots of
|
|
|
|
|
traffic.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="compile">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/compile</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>use strict;
|
|
|
|
|
use Shorewall::Chains;
|
|
|
|
|
|
|
|
|
|
my $chainref = ensure_manual_chain qw/DNS_DDoS/;
|
|
|
|
|
|
|
|
|
|
add_rule $chainref, q(-m string --algo bm --from 30 --to 31 --hex-string "|010000010000000000000000020001|" -j DROP);
|
|
|
|
|
add_rule $chainref, q(-m string --algo bm --from 30 --to 31 --hex-string "|000000010000000000000000020001|" -j DROP);
|
|
|
|
|
add_rule $chainref, q(-j ACCEPT);
|
|
|
|
|
|
|
|
|
|
1;</programlisting>The above was created during a recent DDOS incident that
|
|
|
|
|
targeted DNS servers. It illustrates how manual chains can be
|
|
|
|
|
created.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="findgw">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/findgw</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>if [ -f /var/lib/dhcp3/dhclient.${1}.leases ]; then
|
|
|
|
|
grep 'option routers' /var/lib/dhcp3/dhclient.${1}.leases | tail -n 1 | while read j1 j2 gateway; do echo $gateway | sed 's/;//'; return 0; done
|
|
|
|
|
fi</programlisting>The Comcast line has a dynamic IP address assigned with the
|
|
|
|
|
help of dhclient.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="isusable">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/isusable</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>local status
|
|
|
|
|
status=0
|
|
|
|
|
|
|
|
|
|
[ -f /etc/shorewall/${1}.status ] && status=$(cat /etc/shorewall/${1}.status)
|
|
|
|
|
|
|
|
|
|
return $status</programlisting>For use with <ulink
|
|
|
|
|
url="MultiISP.html#lsm">lsm</ulink>.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="libprivate">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/lib.private</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>start_lsm() {
|
|
|
|
|
killall lsm 2> /dev/null
|
|
|
|
|
cat <<EOF > /etc/lsm/shorewall.conf
|
|
|
|
|
connection {
|
|
|
|
|
name=Avvanta
|
|
|
|
|
checkip=206.124.146.254
|
|
|
|
|
device=$EXT_IF
|
|
|
|
|
ttl=2
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
connection {
|
|
|
|
|
name=Comcast
|
|
|
|
|
checkip=${ETH0_GATEWAY:-71.231.152.1}
|
|
|
|
|
device=$COM_IF
|
|
|
|
|
ttl=1
|
|
|
|
|
}
|
|
|
|
|
EOF
|
|
|
|
|
rm -f /etc/shorewall/*.status
|
|
|
|
|
/usr/sbin/lsm /etc/lsm/lsm.conf >> /var/log/lsm
|
|
|
|
|
}
|
|
|
|
|
</programlisting>This function configures and starts <ulink
|
|
|
|
|
url="MultiISP.html#lsm">lsm</ulink>.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="masq">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/masq</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#INTERFACE SOURCE ADDRESS
|
|
|
|
|
|
|
|
|
|
COMMENT Masquerade Local Network
|
|
|
|
|
$COM_IF 0.0.0.0/0
|
|
|
|
|
$EXT_IF !206.124.146.0/24 206.124.146.179
|
|
|
|
|
</programlisting>All connections out through Comcast must have the dynamically
|
|
|
|
|
assigned address as their source address. Traffic from hosts without an
|
|
|
|
|
Avvanta public IP address get 206.124.146.179 as their source
|
|
|
|
|
address.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
<section>
|
|
|
|
|
<title>/etc/shorewall/notrack</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#SOURCE DESTINATION PROTO DEST SOURCE USER/
|
|
|
|
|
# PORT(S) PORT(S) GROUP
|
|
|
|
|
net:!192.88.99.1 - 41
|
|
|
|
|
dmz 206.124.146.255 udp
|
|
|
|
|
dmz 255.255.255.255 udp
|
|
|
|
|
loc 172.20.1.255 udp
|
|
|
|
|
loc 255.255.255.255 udp
|
|
|
|
|
$FW 255.255.255.255 udp
|
|
|
|
|
$FW 172.20.1.255 udp
|
|
|
|
|
$FW 206.124.146.255 udp</programlisting>This file omits the
|
|
|
|
|
6to4 traffic originating from 6to4 relays as well as broadcast traffic
|
|
|
|
|
(which Netfilter doesn't handle).</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
<section>
|
|
|
|
|
<title>/etc/shorewall/providers</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#NAME NUMBER MARK DUPLICATE INTERFACE GATEWAY OPTIONS COPY
|
|
|
|
|
Avvanta 1 0x10000 main $EXT_IF 206.124.146.254 track,loose,fallback $INT_IF,$VPS_IF,tun*
|
|
|
|
|
Comcast 2 0x20000 main $COM_IF detect track,balance $INT_IF,$VPS_IF,tun*</programlisting>See
|
|
|
|
|
the <ulink url="???">Multi-ISP article</ulink> for an explaination of
|
|
|
|
|
the multi-ISP aspects of this configuration.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="proxyarp">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/proxyarp</title>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<para><programlisting><empty></programlisting>As mentioned <link
|
|
|
|
|
linkend="interfaces">above</link>, I set the proxyarp on the associated
|
|
|
|
|
external interface instead of defining proxy ARP in this file.</para>
|
2009-08-01 04:37:24 +02:00
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="restored">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/restored</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>if [ -z "$(ps ax | grep 'lsm ' | grep -v 'grep ' )" ]; then
|
|
|
|
|
start_lsm
|
|
|
|
|
fi
|
|
|
|
|
|
|
|
|
|
chmod 744 ${VARDIR}/state</programlisting>If lsm isn't running then start it.
|
|
|
|
|
Make the state file world-readable.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="route_rules">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/route_rules</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#SOURCE DEST PROVIDER PRIORITY
|
|
|
|
|
|
|
|
|
|
- 72.20.0.0/24 main 1000 #OpenVPN clients
|
|
|
|
|
- 206.124.146.177 main 1001 #Servers -- Routes configured by OpenVZ
|
|
|
|
|
- 206.124.146.178 main 1001 #
|
|
|
|
|
- 216.168.3.44 Avvanta 1001 #NNTP -- Does source IP verification
|
|
|
|
|
206.124.146.176/30 - Avvanta 26000 #Avvanta public IP addresses
|
|
|
|
|
206.124.146.180 - Avvanta 26000 #</programlisting>These
|
|
|
|
|
entries simply ensure that outgoing traffic uses the correct
|
|
|
|
|
interface.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="routestopped">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/routestopped</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#INTERFACE HOST(S) OPTIONS PROTO
|
|
|
|
|
$INT_IF 172.20.1.0/24 source,dest
|
|
|
|
|
$VPS_IF 206.124.146.177,206.124.146.178
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$EXT_IF - notrack 41</programlisting>Keep
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the lights on while Shorewall is stopped.</para>
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</section>
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2009-08-01 16:56:31 +02:00
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<section id="rules">
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2009-08-01 04:37:24 +02:00
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<title>/etc/shorewall/rules</title>
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<para><programlisting>###############################################################################################################################################################################
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#ACTION SOURCE DEST PROTO DEST SOURCE ORIGINAL RATE USER/
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# PORT PORT(S) DEST LIMIT GROUP
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###############################################################################################################################################################################
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SECTION ESTABLISHED
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SECTION RELATED
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SECTION NEW
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REJECT:$LOG loc net tcp 25 #Stop direct loc->net SMTP (Comcast uses submission).
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REJECT:$LOG loc net udp 1025:1031 #MS Messaging
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COMMENT Stop NETBIOS crap
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REJECT loc net tcp 137,445
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REJECT loc net udp 137:139
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COMMENT Stop my idiotic work laptop from sending to the net with an HP source IP address
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DROP loc:!172.20.0.0/23 net
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COMMENT
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###############################################################################################################################################################################
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# Local Network to Firewall
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#
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NONAT drct -
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REDIRECT- loc 3128 tcp 80 - !66.199.187.46,172.20.1.108,206.124.146.177,155.98.64.80,81.19.16.0/21
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###############################################################################################################################################################################
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# Local network to DMZ
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#
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ACCEPT loc dmz udp domain,177
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ACCEPT loc dmz tcp ssh,smtp,465,587,www,ftp,imaps,domain,https,5901:5903 -
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ACCEPT loc dmz udp 33434:33524
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###############################################################################################################################################################################
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# Internet to ALL -- drop NewNotSyn packets
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#
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dropNotSyn net fw tcp
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dropNotSyn net loc tcp
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dropNotSyn net dmz tcp
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###############################################################################################################################################################################
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# Internet to DMZ
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#
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DNS_DDoS net dmz udp domain
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ACCEPT net dmz tcp smtp,www,ftp,465,587,imaps,domain,https
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ACCEPT net dmz udp 33434:33454
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Mirrors:none net dmz tcp 873
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ACCEPT net dmz tcp 22 - - s:ssh:3/min:3
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#############################################################################################################################################################
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#################
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#
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# Net to Local
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#
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Limit:$LOG:SSHA,3,60\
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net loc tcp 22
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#
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|
# BitTorrent from Wireless Network
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#
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#DNAT net:$COM_IF loc:172.20.1.102 tcp 6881:6889
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#DNAT net:$COM_IF loc:172.20.1.102 udp 6881
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#
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# UPnP
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#
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forwardUPnP net loc
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#
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|
# Silently Handle common probes
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#
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REJECT net loc tcp www,ftp,https
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DROP net loc icmp 8
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###############################################################################################################################################################################
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# DMZ to Internet
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#
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ACCEPT dmz net udp domain,ntp
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REJECT dmz net:$COM_IF tcp smtp
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ACCEPT dmz net tcp echo,ftp,ssh,smtp,whois,domain,www,81,nntp,https,2401,2702,2703,8080
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ACCEPT dmz net:$POPSERVERS tcp pop3
|
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|
#
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|
# Some FTP clients seem prone to sending the PORT command split over two packets. This prevents the FTP connection tracking
|
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|
|
# code from processing the command and setting up the proper expectation. The following rule allows active FTP to work in these cases
|
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|
# but logs the connection so I can keep an eye on this potential security hole.
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#
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|
ACCEPT:$LOG dmz net tcp 1024: 20
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###############################################################################################################################################################################
|
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|
# DMZ to Local
|
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#
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|
|
ACCEPT dmz loc tcp 22 - - s:ssh:3/min:3
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|
|
###############################################################################################################################################################################
|
2009-08-02 18:28:26 +02:00
|
|
|
# DMZ to Firewall -- ntp & snmp Silently reject Auth
|
2009-08-01 04:37:24 +02:00
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|
|
#
|
2009-08-02 18:28:26 +02:00
|
|
|
ACCEPT dmz fw tcp 161,ssh
|
2009-08-01 04:37:24 +02:00
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|
|
ACCEPT dmz fw udp 161,ntp
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|
REJECT dmz fw tcp auth
|
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|
|
###############################################################################################################################################################################
|
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|
|
# Internet to Firewall
|
|
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|
|
#
|
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|
|
REJECT net fw tcp www,ftp,https
|
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|
|
DROP net fw icmp 8
|
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|
|
ACCEPT net fw udp 33434:33454
|
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|
|
ACCEPT net fw tcp 22 - - s:ssh:3/min:3
|
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ACCEPT net fw udp 33434:33524
|
|
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|
|
###############################################################################################################################################################################
|
|
|
|
|
# Firewall to DMZ
|
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|
#
|
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|
|
ACCEPT fw dmz tcp domain,www,ftp,ssh,smtp,https,993,465,587,5901
|
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ACCEPT fw dmz udp domain
|
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|
REJECT fw dmz udp 137:139
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|
##############################################################################################################################################################################
|
|
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|
|
#
|
|
|
|
|
COMMENT Freenode Probes
|
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|
|
DROP net:82.96.96.3,85.190.0.3 any
|
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|
|
COMMENT
|
|
|
|
|
##############################################################################################################################################################################
|
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|
|
# Allow Ping except where disallowed earlier
|
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|
|
#
|
|
|
|
|
ACCEPT any any icmp 8</programlisting></para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="started">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/started</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>if [ -z "$(ps ax | grep 'lsm ' | grep -v 'grep ' )" ]; then
|
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|
|
start_lsm
|
|
|
|
|
fi
|
|
|
|
|
|
|
|
|
|
chmod 744 ${VARDIR}/state</programlisting>If lsm isn't running then start it.
|
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|
|
|
Make the state file world-readable.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="stopped">
|
2009-08-01 04:37:24 +02:00
|
|
|
<title>/etc/shorewall/stopped</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>if [ "$COMMAND" = stop -o "$COMMAND" = clear ]; then
|
|
|
|
|
killall lsm 2> /dev/null
|
|
|
|
|
fi
|
|
|
|
|
|
|
|
|
|
chmod 744 ${VARDIR}/state</programlisting>Kill lsm if the command is stop or
|
|
|
|
|
clear. Make the state file world-readable.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-02 17:36:29 +02:00
|
|
|
<section>
|
|
|
|
|
<title>/etc/shorewall/tcdevices</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#INTERFACE IN-BANDWITH OUT-BANDWIDTH OPTIONS
|
|
|
|
|
$EXT_IF - 300kbit classify
|
|
|
|
|
$INT_IF - 80mbit classify
|
|
|
|
|
$COM_IF - 4mbit classify,hfsc
|
|
|
|
|
</programlisting>The use of HFSC on the Comcast link is largely to provide a
|
|
|
|
|
test bed for that qdisc; I really don't have any real-time requirement
|
|
|
|
|
such as VOIP.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
<section>
|
|
|
|
|
<title>/etc/shorewall/tcclasses</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>INTERFACE MARK RATE CEIL PRIORITY OPTIONS
|
|
|
|
|
1:110 - full/4 full 1 tcp-ack,tos-minimize-delay
|
|
|
|
|
1:120 - full/4 full 2 flow=nfct-src
|
|
|
|
|
1:130 - full/4 230kbit 3 default,flow=nfct-src
|
|
|
|
|
1:140 - full/4 230kbit 4 flow=nfct-src
|
|
|
|
|
|
|
|
|
|
2:10 - 95*full/100 full 1 flow=dst
|
|
|
|
|
2:100 - 14mbit 20mbit 2
|
|
|
|
|
2:100:101 - 7mbit 20mbit 3 default,flow=dst
|
|
|
|
|
2:100:102 - 7mbit 20mbit 3 flow=dst
|
|
|
|
|
|
|
|
|
|
3:10 - 2mbit:4ms full 1 flow=nfct-src
|
|
|
|
|
3:100 - 2mbit full 2
|
|
|
|
|
3:100:101 - 1mbit full 3 default,flow=nfct-src
|
|
|
|
|
3:100:102 - 1mbit full 3 flow=nfct-src
|
|
|
|
|
</programlisting>Note that most of the outgoing bandwidth on the local
|
|
|
|
|
interface is allocated to one class. That class is used for local
|
|
|
|
|
traffic.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
<section>
|
|
|
|
|
<title>/etc/shorewall/tcfilters</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#INTERFACE: SOURCE DEST PROTO DEST SOURCE TOS LENGTH
|
|
|
|
|
#CLASS PORT(S) PORT(S)
|
|
|
|
|
|
|
|
|
|
# =============================== AVVANTA ====================================
|
|
|
|
|
#
|
|
|
|
|
# Give Highest priority to LSM's pings to the gateway and to DNS queries
|
|
|
|
|
#
|
|
|
|
|
1:110 206.124.146.176 206.124.146.254 icmp
|
|
|
|
|
1:110 206.124.146.177 - udp 53
|
|
|
|
|
#
|
|
|
|
|
# Second Highest priority to IPv6 Tunnel
|
|
|
|
|
#
|
|
|
|
|
1:120 206.124.146.180
|
|
|
|
|
#
|
|
|
|
|
# Lowest priority to bulk traffic
|
|
|
|
|
#
|
|
|
|
|
1:140 206.124.146.177 - tcp - 873 - 2048
|
|
|
|
|
1:140 206.124.146.177 - - - - tos-minimize-cost
|
|
|
|
|
</programlisting>The tcfilters file is only used for the Avvanta provider
|
|
|
|
|
because it has static public IP addresses.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
<section>
|
|
|
|
|
<title>/etc/shorewall/tcrules</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#MARK SOURCE DEST PROTO PORT(S) CLIENT USER TEST LENGTH TOS
|
|
|
|
|
# PORT(S)
|
|
|
|
|
|
|
|
|
|
COMMENT Shape incoming traffic
|
|
|
|
|
|
|
|
|
|
#
|
|
|
|
|
# Most of the bandwidth is reserved for local traffic since the downlinks aren't that fast
|
|
|
|
|
#
|
|
|
|
|
2:10 206.124.146.176/30 $INT_IF
|
|
|
|
|
2:10 206.124.146.177 $INT_IF
|
|
|
|
|
2:10 172.20.1.254 $INT_IF
|
|
|
|
|
#
|
|
|
|
|
# Guarantee 1/2 of the incoming bandwidth for my work system
|
|
|
|
|
#
|
|
|
|
|
2:102 0.0.0.0/0 $INT_IF:172.20.1.107
|
|
|
|
|
|
|
|
|
|
COMMENT Shape outgoing traffic to Comcast
|
|
|
|
|
#
|
|
|
|
|
# Give 1/2 to my work system and add a latency guarantee
|
|
|
|
|
#
|
|
|
|
|
3:10 172.20.1.107 $COM_IF
|
|
|
|
|
#
|
|
|
|
|
# Restrict Torrent uploads
|
|
|
|
|
#
|
|
|
|
|
3:102 172.20.1.0/24 $COM_IF tcp - 6881:6889
|
|
|
|
|
</programlisting>The tcrules file is used to classify traffic that deals with
|
|
|
|
|
the local network and/or with Comcast.</para>
|
|
|
|
|
</section>
|
|
|
|
|
|
2009-08-01 16:56:31 +02:00
|
|
|
<section id="tunnels">
|
2009-08-01 16:35:07 +02:00
|
|
|
<title>/etc/shorewall/tunnels</title>
|
|
|
|
|
|
|
|
|
|
<para><programlisting>#TYPE ZONE GATEWAY GATEWAY
|
|
|
|
|
# ZONE
|
|
|
|
|
openvpnserver:udp net
|
|
|
|
|
6to4 net
|
|
|
|
|
ipsec net
|
|
|
|
|
ipsec loc
|
|
|
|
|
ipip vpn 0.0.0.0/0</programlisting>The ipip tunnel from
|
|
|
|
|
the vpn zone handles IP compression on IPSEC connections.</para>
|
2009-08-01 04:37:24 +02:00
|
|
|
</section>
|
|
|
|
|
</section>
|
|
|
|
|
</article>
|
