2006-02-19 00:53:52 +01:00
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<?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>Xen and the Art of Consolidation</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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2006-03-14 18:00:19 +01:00
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<pubdate>2006-03-14</pubdate>
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2006-02-19 00:53:52 +01:00
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<copyright>
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<year>2006</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>Before Xen</title>
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<para>Prior to adopting <ulink url="Xen.html">Xen</ulink>, I had a home
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office crowded with 5 systems, three monitors a scanner and a printer. The
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systems were:</para>
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<orderedlist>
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<listitem>
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<para>Firewall</para>
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</listitem>
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<listitem>
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<para>Public Server in a DMZ (mail)</para>
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</listitem>
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<listitem>
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<para>Private Server (wookie)</para>
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</listitem>
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<listitem>
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<para>My personal Linux Desktop (ursa)</para>
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</listitem>
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<listitem>
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<para>My work system (docked laptop running Windows XP).</para>
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</listitem>
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</orderedlist>
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<para>The result was a very crowded and noisy room.</para>
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</section>
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<section>
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<title>After Xen</title>
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<para>Xen has allowed me to reduce the noise and clutter considerably. I
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now have three systems with two monitors. I've also replaced the
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individual printer and scanner with a Multifunction
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FAX/Scanner/Printer.</para>
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<para>The systems now include:</para>
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<orderedlist>
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<listitem>
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<para>Combination Firewall/Public Server/Private Server using Xen
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(created by building out my Linux desktop system).</para>
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</listitem>
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<listitem>
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<para>My work system.</para>
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</listitem>
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<listitem>
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2006-02-23 20:34:35 +01:00
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<para>My Linux desktop (wookie, which is actually the old public
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server box)</para>
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</listitem>
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</orderedlist>
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<para>All of the Linux systems run SuSE 10.0.</para>
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2006-03-11 00:11:56 +01:00
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<para>If you are unfamiliar with Xen networking, I recommend that you read
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the first section of the companion <ulink url="Xen.html">Xen and
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Shorewall</ulink> article.</para>
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2006-02-19 00:53:52 +01:00
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<para>Here is a high-level diagram of our network.</para>
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<graphic align="center" fileref="images/Xen5.png" />
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<para>As shown in this diagram, the Xen system has three physical network
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interfaces. These are:</para>
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<itemizedlist>
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<listitem>
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<para><filename class="devicefile">eth0</filename> -- conntected to
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the switch in my office. That switch is cabled to a second switch in
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my wife's office where there is my wife's desktop and her networked
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printer.</para>
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</listitem>
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<listitem>
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<para><filename class="devicefile">eth1</filename> -- connected to our
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DSL "Modem".</para>
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</listitem>
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<listitem>
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<para><filename class="devicefile">eth2</filename> -- connected to a
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Wireless Access Point (WAP) that interfaces to our wireless
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network.</para>
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</listitem>
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</itemizedlist>
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<para>There are three Xen domains. Dom0 (ursa) is used as a file server.
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One DomU (which is usually Domain 1) is used as a firewall and the other
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(lists, normally Domain 2) is used as a public Web/FTP/Mail/DNS server.
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Because Xen 3 only supports three virtual interfaces per DomU, I also use
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ursa as a gateway for our wireless network rather than placing that
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function in the firewall DomU (that domain already has three interfaces).
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Shorewall runs in both Dom0 and in the firewall domain.</para>
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2006-02-19 21:28:12 +01:00
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2006-02-23 20:34:35 +01:00
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<para>The system has 1.5GB of RAM so I allocate 512MB to each server and
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448MB to the firewall (the remaining 64MB is used by Xen).</para>
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2006-02-23 20:34:35 +01:00
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<para>Below are the relevant configuration files for the three domains.
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The "loopback.nloopbacks=..." entries are used to restrict the number of
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"veth<emphasis>n</emphasis>" devices that the Xen kernel creates. I use
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partitions on my hard drives for DomU storage devices.</para>
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<blockquote>
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<para><filename>/boot/grub/menu.lst</filename> — here is the entry that
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boots Xen in Dom0.</para>
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<programlisting>title XEN
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root (hd0,1)
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kernel /boot/xen.gz dom0_mem=524288 sched=bvt
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module /boot/vmlinuz-xen root=/dev/hda2 vga=0x31a selinux=0 resume=/dev/hda1 splash=silent showopts loopback.nloopbacks=1
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module /boot/initrd-xen</programlisting>
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<para><filename>/etc/xen/auto/01-gateway</filename> — configuration file
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for the firewall domain</para>
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<programlisting># -*- mode: python; -*-
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# configuration name:
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name = "gateway"
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# usable ram:
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memory = 448
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# kernel and initrd:
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kernel = "/boot/vmlinuz-xen"
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ramdisk = "/boot/initrd-xen"
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# boot device:
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root = "/dev/hdb2"
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# boot to run level:
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extra = "loopback.nloopbacks=0 3"
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# network interface:
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vif = [ 'mac=aa:cc:00:00:00:02, bridge=xenbr0', 'mac=aa:cc:00:00:00:03, bridge=xenbr1' , 'mac=00:a0:cc:63:66:89, bridge=xenbr2' ]
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hostname = name
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# storage devices:
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disk = [ 'phy:hdb2,hdb2,w' ]</programlisting>
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<para><filename>/etc/xen/auto/02-server</filename> — configuration file
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for the lists domain</para>
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<programlisting># -*- mode: python; -*-
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# configuration name:
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name = "server"
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# usable ram:
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memory = 512
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# kernel and initrd:
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kernel = "/boot/vmlinuz-xen"
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ramdisk = "/boot/initrd-xen"
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# boot device:
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root = "/dev/hda3"
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# boot to run level:
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extra = "loopback.nloopbacks=0 3"
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# network interface:
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vif = [ 'mac=aa:cc:00:00:00:01, bridge=xenbr1' ]
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hostname = name
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# storage devices:
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disk = [ 'phy:hda3,hda3,w' ]</programlisting>
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</blockquote>
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<para>With all three Xen domains up and running, the system looks as shown
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in the following diagram.</para>
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<graphic align="center" fileref="images/Xen4.png" />
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<para>The zones correspond to the Shorewall zones in the Dom0
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configuration.</para>
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<para>SuSE 10.0 includes Xen 3.0 which does not support PCI delegation; I
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therefore use a bridged configuration with three briges (one for each
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network interface). When Shorewall starts during boot, it creates the
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three bridges and the tap device <filename
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class="devicefile">tap0</filename> and adds tap0 to <filename
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class="devicefile">xenbr0</filename>. tap0 is used by <ulink
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url="OPENVPN.html">OpenVPN</ulink> to secure the Wifi zone.</para>
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<para>Here is <filename>/etc/shorewall/init in Dom0</filename>:</para>
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<blockquote>
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<programlisting>for bridge in xenbr0 xenbr1 xenbr2; do
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if [ -z "$(/sbin/brctl show 2> /dev/null | fgrep $bridge)" ]; then
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/sbin/brctl addbr $bridge
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/sbin/ip link set dev $bridge up
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case $bridge in
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xenbr2)
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mac=`ip link show eth1 | grep 'link\/ether' | sed -e 's/.*ether \(..:..:..:..:..:..\).*/\1/'`
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[ "$mac" = "fe:ff:ff:ff:ff:ff" ] || /sbin/ip link set dev eth1 addr fe:ff:ff:ff:ff:ff
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/sbin/ip link set dev eth1 up
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/sbin/brctl addif xenbr2 eth1
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;;
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xenbr0)
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if ! qt /sbin/ip link ls dev tap0; then
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/usr/sbin/openvpn --mktun --dev tap0
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/sbin/ip link set dev tap0 up
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/sbin/brctl addif xenbr0 tap0
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fi
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;;
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esac
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fi
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done</programlisting>
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2006-02-19 00:53:52 +01:00
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</blockquote>
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<para>The goals for the Shorewall configuration in Dom0 are as
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follows:</para>
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<itemizedlist>
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<listitem>
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<para>Isolate the Wireless Network so that only VPN access to the
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local lan is allowed.</para>
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</listitem>
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<listitem>
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2006-03-14 18:00:19 +01:00
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<para>Allow traffic to flow unrestricted through the three bridges.
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This is done by configuring the hosts connected to each bridge as a
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separate zone and relying on the implicit intra-zone ACCEPT policy to
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permit traffic through the bridge.</para>
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2006-02-19 00:53:52 +01:00
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</listitem>
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<listitem>
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2006-03-14 18:00:19 +01:00
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<para>Ensure that there is no stray traffic between the zones. This is
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a "belt+suspenders" measure since there should be no routing between
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the bridges (because they don't have IP addresses).</para>
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2006-02-19 00:53:52 +01:00
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</listitem>
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</itemizedlist>
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<para>The configuration is a simple one:</para>
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<blockquote>
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<para><filename>/etc/shorewall/zones</filename>:</para>
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<programlisting>#ZONE TYPE OPTIONS IN OUT
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# OPTIONS OPTIONS
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fw firewall
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Wifi ipv4
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loc ipv4
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dmz ipv4
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net ipv4
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#LAST LINE - ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE
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</programlisting>
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<para><filename>/etc/shorewall/policy</filename>:</para>
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<programlisting>#SOURCE DEST POLICY LOG LIMIT:BURST
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# LEVEL
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Wifi all REJECT info
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dmz all REJECT info
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all dmz REJECT info
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net all REJECT info
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all net REJECT info
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all all ACCEPT
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#LAST LINE -- DO NOT REMOVE</programlisting>
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<para><filename>/etc/shorewall/interfaces</filename>:</para>
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<programlisting>#ZONE INTERFACE BROADCAST OPTIONS
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Wifi eth2 192.168.3.255 dhcp,maclist
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loc xenbr0 192.168.1.255 dhcp,routeback
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dmz xenbr1 - routeback
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net xenbr2 - routeback
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#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
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<para><filename>/etc/shorewall/rules</filename>:</para>
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<programlisting>#ACTION SOURCE DEST PROTO DEST SOURCE ORIGINAL RATE USER/
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|
|
|
|
# PORT PORT(S) DEST LIMIT GROUP
|
|
|
|
|
#SECTION ESTABLISHED
|
|
|
|
|
#SECTION RELATED
|
|
|
|
|
SECTION NEW
|
|
|
|
|
#############################################################################################################
|
|
|
|
|
#
|
|
|
|
|
# BS Address rules
|
|
|
|
|
#
|
|
|
|
|
DROP Wifi net:15.0.0.0/8
|
|
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|
|
DROP Wifi net:16.0.0.0/8
|
|
|
|
|
#
|
|
|
|
|
# Insecure Wireless to local network
|
|
|
|
|
#
|
|
|
|
|
ACCEPT Wifi loc udp 500
|
|
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|
|
ACCEPT Wifi loc udp 53
|
|
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|
|
ACCEPT Wifi loc udp 4500
|
|
|
|
|
Ping/ACCEPT Wifi loc
|
|
|
|
|
#
|
|
|
|
|
# Insecure Wireless to firewall
|
|
|
|
|
#
|
|
|
|
|
ACCEPT Wifi fw udp 123
|
|
|
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
|
|
|
|
|
</blockquote>
|
|
|
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|
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|
|
|
<para>In the firewall DomU, I run a conventional three-interface firewall
|
|
|
|
|
with Proxy ARP DMZ -- it is very similar to the firewall described in the
|
2006-02-19 18:33:42 +01:00
|
|
|
<ulink url="shorewall_setup_guide.htm">Shorewall Setup Guide</ulink>. The
|
|
|
|
|
firewall runs a routed <ulink url="OPENVPN.html">OpenVPN server</ulink> to
|
|
|
|
|
provide roadwarrior access for our two laptops. Here is the firewall's
|
|
|
|
|
view of the network:</para>
|
|
|
|
|
|
|
|
|
|
<graphic align="center" fileref="images/network4.png" />
|
|
|
|
|
|
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|
|
|
<para>The Shorewall configuration files are shown below. All routing and
|
|
|
|
|
secondary IP addresses are handled in the SuSE network
|
|
|
|
|
configuration.</para>
|
2006-02-19 00:53:52 +01:00
|
|
|
|
|
|
|
|
<blockquote>
|
|
|
|
|
<para>/etc/shorewall/shorewall.conf:</para>
|
|
|
|
|
|
|
|
|
|
<programlisting>TARTUP_ENABLED=Yes
|
|
|
|
|
VERBOSITY=0
|
|
|
|
|
LOGFILE=/var/log/firewall
|
|
|
|
|
LOGFORMAT="Shorewall:%s:%s:"
|
|
|
|
|
LOGTAGONLY=No
|
|
|
|
|
LOGRATE=
|
|
|
|
|
LOGBURST=
|
|
|
|
|
LOGALLNEW=
|
|
|
|
|
BLACKLIST_LOGLEVEL=
|
|
|
|
|
MACLIST_LOG_LEVEL=$LOG
|
|
|
|
|
TCP_FLAGS_LOG_LEVEL=$LOG
|
|
|
|
|
RFC1918_LOG_LEVEL=$LOG
|
|
|
|
|
SMURF_LOG_LEVEL=$LOG
|
|
|
|
|
LOG_MARTIANS=No
|
|
|
|
|
IPTABLES=/usr/sbin/iptables
|
|
|
|
|
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin
|
|
|
|
|
SHOREWALL_SHELL=/bin/bash
|
|
|
|
|
SUBSYSLOCK=
|
|
|
|
|
MODULESDIR=
|
|
|
|
|
CONFIG_PATH=/etc/shorewall:/usr/share/shorewall
|
|
|
|
|
RESTOREFILE=standard
|
|
|
|
|
IPSECFILE=zones
|
|
|
|
|
IP_FORWARDING=On
|
|
|
|
|
ADD_IP_ALIASES=No
|
|
|
|
|
ADD_SNAT_ALIASES=No
|
|
|
|
|
RETAIN_ALIASES=No
|
|
|
|
|
TC_ENABLED=Internal
|
|
|
|
|
CLEAR_TC=Yes
|
|
|
|
|
MARK_IN_FORWARD_CHAIN=Yes
|
|
|
|
|
CLAMPMSS=Yes
|
|
|
|
|
ROUTE_FILTER=No
|
|
|
|
|
DETECT_DNAT_IPADDRS=Yes
|
|
|
|
|
MUTEX_TIMEOUT=60
|
|
|
|
|
ADMINISABSENTMINDED=Yes
|
|
|
|
|
BLACKLISTNEWONLY=Yes
|
|
|
|
|
DELAYBLACKLISTLOAD=No
|
|
|
|
|
MODULE_SUFFIX=
|
|
|
|
|
DISABLE_IPV6=Yes
|
|
|
|
|
BRIDGING=No
|
|
|
|
|
DYNAMIC_ZONES=No
|
|
|
|
|
PKTTYPE=No
|
|
|
|
|
RFC1918_STRICT=Yes
|
|
|
|
|
MACLIST_TTL=60
|
|
|
|
|
SAVE_IPSETS=No
|
|
|
|
|
MAPOLDACTIONS=No
|
|
|
|
|
FASTACCEPT=Yes
|
|
|
|
|
BLACKLIST_DISPOSITION=DROP
|
|
|
|
|
MACLIST_TABLE=mangle
|
|
|
|
|
MACLIST_DISPOSITION=DROP
|
|
|
|
|
TCP_FLAGS_DISPOSITION=DROP</programlisting>
|
|
|
|
|
|
|
|
|
|
<para><filename>/etc/shorewall/zones</filename>:</para>
|
|
|
|
|
|
|
|
|
|
<programlisting>#ZONE TYPE OPTIONS IN OUT
|
|
|
|
|
# OPTIONS OPTIONS
|
|
|
|
|
fw firewall
|
|
|
|
|
net ipv4 #Internet
|
|
|
|
|
loc ipv4 #Local wired Zone
|
2006-02-19 18:33:42 +01:00
|
|
|
dmz:loc ipv4 #DMZ -- server running in virtual machine at 206.124.146.177
|
2006-02-19 00:53:52 +01:00
|
|
|
vpn ipv4 #Open VPN clients
|
|
|
|
|
#LAST LINE - ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE
|
|
|
|
|
</programlisting>
|
|
|
|
|
|
|
|
|
|
<para><filename>/etc/shorewall/policy</filename>:</para>
|
|
|
|
|
|
|
|
|
|
<programlisting>#SOURCE DEST POLICY LOG LIMIT:BURST
|
|
|
|
|
# LEVEL
|
|
|
|
|
$FW $FW ACCEPT
|
|
|
|
|
$FW net ACCEPT
|
|
|
|
|
loc net ACCEPT
|
|
|
|
|
$FW vpn ACCEPT
|
|
|
|
|
vpn net ACCEPT
|
|
|
|
|
vpn loc ACCEPT
|
|
|
|
|
loc vpn ACCEPT
|
|
|
|
|
$FW loc ACCEPT
|
|
|
|
|
loc $FW REJECT $LOG
|
|
|
|
|
net all DROP $LOG 10/sec:40
|
|
|
|
|
all all REJECT $LOG
|
|
|
|
|
#LAST LINE -- DO NOT REMOVE</programlisting>
|
|
|
|
|
|
|
|
|
|
<para><filename>/etc/shorewall/params (edited)</filename>:</para>
|
|
|
|
|
|
|
|
|
|
<programlisting>MIRRORS=<comma-separated list of Shorewall mirrors>
|
|
|
|
|
|
|
|
|
|
NTPSERVERS=<comma-separated list of NTP servers I sync with>
|
|
|
|
|
|
|
|
|
|
POPSERVERS=<comma-separated list of server IP addresses>
|
|
|
|
|
|
|
|
|
|
LOG=info
|
|
|
|
|
|
|
|
|
|
INT_IF=eth0
|
|
|
|
|
DMZ_IF=eth1
|
|
|
|
|
EXT_IF=eth3
|
|
|
|
|
|
|
|
|
|
OMAK=<IP address at our second home>
|
|
|
|
|
|
|
|
|
|
#LAST LINE - ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE
|
|
|
|
|
</programlisting>
|
|
|
|
|
|
2006-02-23 20:34:35 +01:00
|
|
|
<para><filename>/etc/shorewall/init</filename>:</para>
|
|
|
|
|
|
|
|
|
|
<programlisting>echo 1 > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_be_liberal
|
|
|
|
|
|
|
|
|
|
</programlisting>
|
|
|
|
|
|
|
|
|
|
<para><filename>/</filename></para>
|
|
|
|
|
|
2006-02-19 00:53:52 +01:00
|
|
|
<para><filename>/etc/shorewall/interfaces</filename>:</para>
|
|
|
|
|
|
|
|
|
|
<programlisting>#ZONE INTERFACE BROADCAST OPTIONS
|
|
|
|
|
net $EXT_IF 206.124.146.255 dhcp,norfc1918,logmartians,blacklist,tcpflags,nosmurfs
|
|
|
|
|
dmz $DMZ_IF 192.168.0.255 logmartians
|
|
|
|
|
loc $INT_IF 192.168.1.255 dhcp,routeback,logmartians
|
|
|
|
|
vpn tun+ -
|
|
|
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
|
|
|
|
|
|
|
|
|
|
<para><filename>/etc/shorewall/nat</filename>:</para>
|
|
|
|
|
|
|
|
|
|
<programlisting>#EXTERNAL INTERFACE INTERNAL ALL LOCAL
|
|
|
|
|
# INTERFACES
|
|
|
|
|
206.124.146.178 $EXT_IF 192.168.1.5 No No
|
|
|
|
|
206.124.146.180 $EXT_IF 192.168.1.6 No No
|
|
|
|
|
#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE</programlisting>
|
|
|
|
|
|
|
|
|
|
<para><filename>/etc/shorewall/masq</filename>:</para>
|
|
|
|
|
|
|
|
|
|
<programlisting>#INTERFACE SUBNET ADDRESS PROTO PORT(S) IPSEC
|
|
|
|
|
+$EXT_IF:192.168.1.1 0.0.0.0/0 192.168.1.254
|
|
|
|
|
$EXT_IF 192.168.0.0/22 206.124.146.179
|
|
|
|
|
#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE</programlisting>
|
|
|
|
|
|
|
|
|
|
<para><filename>/etc/shorewall/proxyarp</filename>:</para>
|
|
|
|
|
|
|
|
|
|
<programlisting>#ADDRESS INTERFACE EXTERNAL HAVEROUTE PERSISTENT
|
|
|
|
|
192.168.1.1 $EXT_IF $INT_IF yes
|
|
|
|
|
206.124.146.177 $DMZ_IF $EXT_IF yes
|
2006-02-23 20:34:35 +01:00
|
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
|
|
|
|
|
|
|
|
|
|
<para><filename>/etc/shorewall/tunnels</filename>:</para>
|
|
|
|
|
|
|
|
|
|
<programlisting>#TYPE ZONE GATEWAY GATEWAY
|
|
|
|
|
# ZONE
|
|
|
|
|
openvpnserver:udp net 0.0.0.0/0
|
2006-02-19 00:53:52 +01:00
|
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
|
|
|
|
|
|
|
|
|
|
<para><filename>/etc/shorewall/actions</filename>:</para>
|
|
|
|
|
|
|
|
|
|
<programlisting>#ACTION
|
|
|
|
|
Mirrors # Accept traffic from Shorewall Mirrors
|
|
|
|
|
#LAST LINE - ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE</programlisting>
|
|
|
|
|
|
|
|
|
|
<para><filename>/etc/shorewall/action.Mirrors</filename>:</para>
|
|
|
|
|
|
|
|
|
|
<programlisting>#TARGET SOURCE DEST PROTO DEST SOURCE ORIGINAL RATE
|
|
|
|
|
# PORT PORT(S) DEST LIMIT
|
|
|
|
|
ACCEPT $MIRRORS
|
2006-02-23 20:34:35 +01:00
|
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
|
2006-02-19 00:53:52 +01:00
|
|
|
|
|
|
|
|
<para><filename>/etc/shorewall/rules</filename>:</para>
|
|
|
|
|
|
|
|
|
|
<programlisting>SECTION NEW
|
|
|
|
|
###############################################################################################################################################################################
|
|
|
|
|
#ACTION SOURCE DEST PROTO DEST SOURCE ORIGINAL RATE USER/
|
|
|
|
|
# PORT PORT(S) DEST LIMIT GROUP
|
|
|
|
|
###############################################################################################################################################################################
|
|
|
|
|
REJECT:$LOG loc net tcp 25
|
|
|
|
|
REJECT:$LOG loc net udp 1025:1031
|
|
|
|
|
#
|
|
|
|
|
# Stop NETBIOS crap
|
|
|
|
|
#
|
|
|
|
|
REJECT loc net tcp 137,445
|
|
|
|
|
REJECT loc net udp 137:139
|
|
|
|
|
#
|
|
|
|
|
# Stop my idiotic work laptop from sending to the net with an HP source/dest IP address
|
|
|
|
|
#
|
|
|
|
|
DROP loc:!192.168.0.0/22 net
|
|
|
|
|
###############################################################################################################################################################################
|
|
|
|
|
# Local Network to Firewall
|
|
|
|
|
#
|
|
|
|
|
DROP loc:!192.168.0.0/22 fw # Silently drop traffic with an HP source IP from my XP box
|
|
|
|
|
ACCEPT loc fw tcp 22
|
|
|
|
|
ACCEPT loc fw tcp time,631,8080
|
|
|
|
|
ACCEPT loc fw udp 161,ntp,631
|
|
|
|
|
ACCEPT loc:192.168.1.5 fw udp 111
|
|
|
|
|
DROP loc fw tcp 3185 #SuSE Meta pppd
|
|
|
|
|
Ping/ACCEPT loc fw
|
2006-02-23 20:34:35 +01:00
|
|
|
REDIRECT loc 3128 tcp 80 - !206.124.146.177
|
2006-02-19 00:53:52 +01:00
|
|
|
###############################################################################################################################################################################
|
|
|
|
|
# Road Warriors to Firewall
|
|
|
|
|
#
|
|
|
|
|
ACCEPT vpn fw tcp ssh,time,631,8080
|
|
|
|
|
ACCEPT vpn fw udp 161,ntp,631
|
|
|
|
|
Ping/ACCEPT vpn fw
|
|
|
|
|
###############################################################################################################################################################################
|
|
|
|
|
# Road Warriors to DMZ
|
|
|
|
|
#
|
|
|
|
|
ACCEPT vpn dmz udp domain
|
|
|
|
|
ACCEPT vpn dmz tcp www,smtp,smtps,domain,ssh,imap,https,imaps,ftp,10023,pop3 -
|
|
|
|
|
Ping/ACCEPT vpn dmz
|
|
|
|
|
###############################################################################################################################################################################
|
|
|
|
|
# Local network to DMZ
|
|
|
|
|
#
|
|
|
|
|
ACCEPT loc dmz udp domain
|
|
|
|
|
ACCEPT loc dmz tcp ssh,smtps,www,ftp,imaps,domain,https -
|
|
|
|
|
ACCEPT loc dmz tcp smtp
|
|
|
|
|
Trcrt/ACCEPT loc dmz
|
|
|
|
|
###############################################################################################################################################################################
|
|
|
|
|
# Internet to ALL -- drop NewNotSyn packets
|
|
|
|
|
#
|
|
|
|
|
dropNotSyn net fw tcp
|
|
|
|
|
dropNotSyn net loc tcp
|
|
|
|
|
dropNotSyn net dmz tcp
|
|
|
|
|
###############################################################################################################################################################################
|
|
|
|
|
# Internet to DMZ
|
|
|
|
|
#
|
|
|
|
|
ACCEPT net dmz udp domain
|
|
|
|
|
LOG:$LOG net:64.126.128.0/18 dmz tcp smtp
|
|
|
|
|
ACCEPT net dmz tcp smtps,www,ftp,imaps,domain,https -
|
|
|
|
|
ACCEPT net dmz tcp smtp - 206.124.146.177,206.124.146.178
|
|
|
|
|
ACCEPT net dmz udp 33434:33454
|
|
|
|
|
Mirrors net dmz tcp rsync
|
|
|
|
|
Limit:$LOG:SSHA,3,60\
|
|
|
|
|
net dmz tcp 22
|
|
|
|
|
Trcrt/ACCEPT net dmz
|
|
|
|
|
##############################################################################################################################################################################
|
|
|
|
|
#
|
|
|
|
|
# Net to Local
|
|
|
|
|
#
|
|
|
|
|
# When I'm "on the road", the following two rules allow me VPN access back home using PPTP.
|
|
|
|
|
#
|
|
|
|
|
DNAT net loc:192.168.1.4 tcp 1729
|
|
|
|
|
DNAT net loc:192.168.1.4 gre
|
|
|
|
|
#
|
2006-03-14 18:00:19 +01:00
|
|
|
# Roadwarrior access to Wookie
|
2006-02-19 00:53:52 +01:00
|
|
|
#
|
|
|
|
|
ACCEPT net:$OMAK loc tcp 22
|
|
|
|
|
Limit:$LOG:SSHA,3,60\
|
|
|
|
|
net loc tcp 22
|
|
|
|
|
|
|
|
|
|
#
|
|
|
|
|
# ICQ
|
|
|
|
|
#
|
|
|
|
|
ACCEPT net loc:192.168.1.3 tcp 113,4000:4100
|
|
|
|
|
#
|
|
|
|
|
# Bittorrent
|
|
|
|
|
#
|
|
|
|
|
ACCEPT net loc:192.168.1.3 tcp 6881:6889,6969
|
|
|
|
|
ACCEPT net loc:192.168.1.3 udp 6881:6889,6969
|
|
|
|
|
#
|
|
|
|
|
# Real Audio
|
|
|
|
|
#
|
|
|
|
|
ACCEPT net loc:192.168.1.3 udp 6970:7170
|
2006-03-14 18:00:19 +01:00
|
|
|
#
|
2006-02-19 00:53:52 +01:00
|
|
|
# Skype
|
|
|
|
|
#
|
|
|
|
|
ACCEPT net loc:192.168.1.6 tcp 1194
|
|
|
|
|
#
|
|
|
|
|
# Traceroute
|
|
|
|
|
#
|
|
|
|
|
Trcrt/ACCEPT net loc:192.168.1.3
|
|
|
|
|
#
|
|
|
|
|
# Silently Handle common probes
|
|
|
|
|
#
|
|
|
|
|
REJECT net loc tcp www,ftp,https
|
|
|
|
|
DROP net loc icmp 8
|
|
|
|
|
###############################################################################################################################################################################
|
|
|
|
|
# DMZ to Internet
|
|
|
|
|
#
|
|
|
|
|
ACCEPT dmz net udp domain,ntp
|
|
|
|
|
ACCEPT dmz net tcp echo,ftp,ssh,smtp,whois,domain,www,81,https,cvspserver,2702,2703,8080
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ACCEPT dmz net:$POPSERVERS tcp pop3
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Ping/ACCEPT dmz net
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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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# Local to DMZ
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#
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ACCEPT loc dmz udp domain,xdmcp
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ACCEPT loc dmz tcp www,smtp,smtps,domain,ssh,imap,rsync,https,imaps,ftp,10023,pop3,3128
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Trcrt/ACCEPT loc dmz
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###############################################################################################################################################################################
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# DMZ to Local
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#
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ACCEPT dmz net:192.168.1.254 udp 123
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2006-02-20 02:47:21 +01:00
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ACCEPT dmz loc:192.168.1.5 tcp 21
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2006-02-19 00:53:52 +01:00
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Ping/ACCEPT dmz loc
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###############################################################################################################################################################################
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# DMZ to Firewall -- ntp & snmp, Silently reject Auth
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#
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ACCEPT dmz fw tcp 161,ssh
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ACCEPT dmz fw udp 161
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REJECT dmz fw tcp auth
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Ping/ACCEPT dmz fw
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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:$OMAK fw udp ntp
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ACCEPT net fw tcp auth
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ACCEPT net:$OMAK fw tcp 22
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Limit:$LOG:SSHA,3,60\
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net fw tcp 22
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Trcrt/ACCEPT net fw
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###############################################################################################################################################################################
|
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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
|
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ACCEPT fw dmz udp domain
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REJECT fw dmz udp 137:139
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Ping/ACCEPT fw dmz
|
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##############################################################################################################################################################################
|
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|
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# Avoid logging Freenode.net probes
|
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#
|
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DROP net:82.96.96.3 all
|
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#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
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</blockquote>
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</section>
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</article>
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