forked from extern/shorewall_code
f1dadbd601
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@2744 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
1115 lines
43 KiB
XML
1115 lines
43 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<article>
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<!--$Id$-->
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<articleinfo>
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<title>About My Network</title>
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<authorgroup>
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<author>
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<firstname>Tom</firstname>
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<surname>Eastep</surname>
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</author>
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</authorgroup>
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<pubdate>2005-09-16</pubdate>
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<copyright>
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<year>2001-2005</year>
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<holder>Thomas M. Eastep</holder>
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</copyright>
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<legalnotice>
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<para>Permission is granted to copy, distribute and/or modify this
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document under the terms of the GNU Free Documentation License, Version
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1.2 or any later version published by the Free Software Foundation; with
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no Invariant Sections, with no Front-Cover, and with no Back-Cover
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Texts. A copy of the license is included in the section entitled
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<quote><ulink url="GnuCopyright.htm">GNU Free Documentation
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License</ulink></quote>.</para>
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</legalnotice>
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</articleinfo>
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<section>
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<title>My Current Network</title>
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<caution>
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<para>I use a combination of One-to-one NAT and Proxy ARP, neither of
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which are relevant to a simple configuration with a single public IP
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address. If you have just a single public IP address, most of what you
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see here won't apply to your setup so beware of copying parts of this
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configuration and expecting them to work for you. What you copy may or
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may not work in your environment.</para>
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</caution>
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<caution>
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<para>The configuration shown here corresponds to Shorewall version
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2.5.5. My configuration uses features not available in earlier Shorewall
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releases.</para>
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</caution>
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<para>I have DSL service and have 5 static IP addresses
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(206.124.146.176-180). My DSL <quote>modem</quote> (Westell 2200) is
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connected to eth2 and has IP address 192.168.1.1 (factory default). The
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modem is configured in <quote>bridge</quote> mode so PPPoE is not
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involved. I have a local network connected to eth3 (subnet
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192.168.1.0/24), a wireless network (192.168.3.0/24) connected to eth0,
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and a DMZ connected to eth1 (206.124.146.176/32). Note that I configure
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the same IP address on both <filename class="devicefile">eth1</filename>
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and <filename class="devicefile">eth2</filename>.</para>
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<para>In this configuration:</para>
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<itemizedlist>
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<listitem>
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<para>I use one-to-one NAT for Ursa (my personal system that run SuSE
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9.3) - Internal address 192.168.1.5 and external address
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206.124.146.178.</para>
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</listitem>
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<listitem>
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<para>I use one-to-one NAT for Eastepnc6000 (My work system -- Windows
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XP SP1). Internal address 192.168.1.6 and external address
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206.124.146.180.</para>
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</listitem>
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<listitem>
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<para>I use SNAT through 206.124.146.176 for my Wife's Windows XP
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system <quote>Tarry</quote>, and our dual-booting (SuSE
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9.3/Windows XP) laptop <quote>Tipper</quote> which connects through
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the Wireless Access Point (wap) via a Wireless Bridge (wet), and my
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work laptop when it is not docked in my office.<note>
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<para>While the distance between the WAP and where I usually use
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the laptop isn't very far (50 feet or so), using a WAC11 (CardBus
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wireless card) has proved very unsatisfactory (lots of lost
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connections). By replacing the WAC11 with the WET11 wireless
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bridge, I have virtually eliminated these problems (Being an old
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radio tinkerer (K7JPV), I was also able to eliminate the
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disconnects by hanging a piece of aluminum foil on the family room
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wall. Needless to say, my wife Tarry rejected that as a permanent
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solution :-).</para>
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</note></para>
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</listitem>
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</itemizedlist>
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<itemizedlist>
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<listitem>
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<para>Squid runs on the firewall and is configured as a transparent
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proxy.</para>
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</listitem>
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</itemizedlist>
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<para>The firewall runs on a P-II/233 with Debian Sarge (testing).</para>
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<para>Ursa runs Samba for file sharing with the Windows systems and is
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configured as a Wins server.</para>
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<para>The wireless network connects to the firewall's eth0 via a LinkSys
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WAP11. In additional to using the rather weak WEP 40-bit encryption
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(64-bit with the 24-bit preamble), I use <ulink
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url="MAC_Validation.html">MAC verification</ulink> and <ulink
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url="IPSEC-2.6.html">Kernel 2.6 IPSEC</ulink> or <ulink
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url="OPENVPN.html">OpenVPN</ulink>.</para>
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<para>The single system in the DMZ (address 206.124.146.177) runs postfix,
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Courier IMAP (imaps and pop3), DNS, a Web server (Apache) and an FTP
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server (Pure-ftpd) under Fedora Core 3. The system also runs fetchmail to
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fetch our email from our old and current ISPs. That server is managed
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through Proxy ARP.</para>
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<para>The firewall system itself runs a DHCP server that serves the local
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and wireless networks.</para>
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<para>I have one system (Remote, 206.124.146.179) outside the firewall.
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This system, which runs Debian Sarge (testing) is used for roadwarrior VPN
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testing and for checking my firewall "from the outside".</para>
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<para>All administration and publishing is done using ssh/scp. I have a
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desktop environment installed on the firewall but I usually don't start
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it. X applications tunnel through SSH to Ursa or one of the laptops. The
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server also has a desktop environment installed but it is seldom started
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either. For the most part, X tunneled through SSH is used for server
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administration and the server runs at run level 3 (multi-user console mode
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on Fedora).</para>
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<para>I run an SNMP server on my firewall to serve <ulink
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url="http://www.ee.ethz.ch/~oetiker/webtools/mrtg/">MRTG</ulink> running
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in the DMZ.</para>
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<para>The ethernet interface in the Server is configured with IP address
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206.124.146.177, netmask 255.255.255.0. The server's default gateway is
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206.124.146.254 (Router at my ISP. This is the same default gateway used
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by the firewall itself). On the firewall, an entry in my
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/etc/network/interfaces file (see below) adds a host route to
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206.124.146.177 through eth1 when that interface is brought up.</para>
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<para>The firewall is configured with OpenVPN for VPN access from our
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second home in <ulink url="http://www.omakchamber.com/">Omak,
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Washington</ulink> or when we are otherwise out of town. Secure remote
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access via IPSEC is also available. We typically use IPSEC for wireless
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security around the house and OpenVPN for roadwarrior access but the
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Firewall is set up to access either tunnel type from either
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location.</para>
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<para><graphic align="center" fileref="images/network.png" /></para>
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</section>
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<section>
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<title>Firewall Configuration</title>
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<section>
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<title>Shorewall.conf</title>
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<blockquote>
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<programlisting>STARTUP_ENABLED=Yes
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LOGFILE=/var/log/messages
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LOGFORMAT="Shorewall:%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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LOGNEWNOTSYN=$LOG
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MACLIST_LOG_LEVEL=$LOG
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TCP_FLAGS_LOG_LEVEL=$LOG
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RFC1918_LOG_LEVEL=$LOG
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SMURF_LOG_LEVEL=$LOG
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BOGON_LOG_LEVEL=$LOG
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LOG_MARTIANS=No
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IPTABLES=
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PATH=/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin
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SHOREWALL_SHELL=/bin/dash
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SUBSYSLOCK=
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STATEDIR=/var/lib/shorewall
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MODULESDIR=
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CONFIG_PATH=/etc/shorewall:/usr/share/shorewall
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RESTOREFILE=standard
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IPSECFILE=zones
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FW=fw
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IP_FORWARDING=On
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ADD_IP_ALIASES=Yes
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ADD_SNAT_ALIASES=Yes
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RETAIN_ALIASES=Yes
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TC_ENABLED=Yes
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CLEAR_TC=Yes
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MARK_IN_FORWARD_CHAIN=No
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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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NEWNOTSYN=Yes
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ADMINISABSENTMINDED=Yes
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BLACKLISTNEWONLY=Yes
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DELAYBLACKLISTLOAD=No
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MODULE_SUFFIX=
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DISABLE_IPV6=Yes
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BRIDGING=No
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PKTTYPE=No
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RFC1918_STRICT=Yes
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MACLIST_TTL=60
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SAVE_IPSETS=Yes
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MAPOLDACTIONS=No
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FASTACCEPT=No
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BLACKLIST_DISPOSITION=DROP
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MACLIST_DISPOSITION=REJECT
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TCP_FLAGS_DISPOSITION=DROP</programlisting>
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</blockquote>
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</section>
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<section>
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<title>Params File (Edited)</title>
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<blockquote>
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<para><programlisting>NTPSERVERS=<list of NTP server IP addresses>
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POPSERVERS=<list of external POP3 servers accessed by fetchmail running on the DMZ server>
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LOG=info
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WIFI_IF=eth0
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EXT_IF=eth2
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INT_IF=eth3
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DMZ_IF=eth1
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OMAK=<ip address of the gateway at our second home></programlisting></para>
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</blockquote>
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</section>
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<section>
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<title>Zones File</title>
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<blockquote>
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<programlisting>#ZONE TYPE OPTTIONS IN OUT
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# OPTIONS OPTIONS
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net
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dmz
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loc
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vpn
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Wifi
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sec ipsec mode=tunnel mss=1400
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#LAST LINE - ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE
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</programlisting>
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</blockquote>
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</section>
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<section>
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<title>Interfaces File</title>
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<blockquote>
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<programlisting>#ZONE INTERFACE BROADCAST OPTIONS
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net $EXT_IF 206.124.146.255 dhcp,norfc1918,logmartians,blacklist,tcpflags,nosmurfs,arp_filter
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loc $INT_IF detect dhcp,routeback
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dmz $DMZ_IF -
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vpn tun+ -
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Wifi $WIFI_IF - dhcp,maclist
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#LAST LINE - ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE</programlisting>
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</blockquote>
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</section>
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<section>
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<title>Hosts File</title>
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<blockquote>
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<programlisting>#ZONE HOST(S) OPTIONS
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sec $WIFI_IF:192.168.3.0/24
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sec $EXT_IF:0.0.0.0/0
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#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE</programlisting>
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</blockquote>
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</section>
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<section>
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<title>Routestopped File</title>
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<blockquote>
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<programlisting>#INTERFACE HOST(S) OPTIONS
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$DMZ_IF 206.124.146.177 source
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$INT_IF - source,dest
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$WIFI_IF - source,dest
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#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE</programlisting>
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</blockquote>
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</section>
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<section>
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<title>Providers File</title>
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<blockquote>
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<para>This entry isn't necessary but it allows me to smoke test
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parsing of the providers file.</para>
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<programlisting>#NAME NUMBER MARK DUPLICATE INTERFACE GATEWAY OPTIONS COPY
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Blarg 1 1 main $EXT_IF 206.124.146.254 track,balance=1 $INT_IF,$DMZ_IF,$WIFI_IF,tun0
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#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE
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</programlisting>
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</blockquote>
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</section>
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<section>
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<title>Blacklist File</title>
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<blockquote>
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<para>I use <ulink url="ipsets.html">ipsets</ulink> to represent my
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blacklist.</para>
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<programlisting>#ADDRESS/SUBNET PROTOCOL PORT
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+Blacklistports[dst]
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+Blacklistnets[src,dst]
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+Blacklist[src,dst]
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#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE</programlisting>
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</blockquote>
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</section>
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<section>
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<title>RFC1918 File</title>
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<blockquote>
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<para>Because my DSL modem has an RFC 1918 address (192.168.1.1) and
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is connected to eth0, I need to make an exception for that address in
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my rfc1918 file. I copied /usr/share/shorewall/rfc1918 to
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/etc/shorewall/rfc1918 and changed it as follows:</para>
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<programlisting>#SUBNET TARGET
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<emphasis role="bold">192.168.1.1 RETURN</emphasis>
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172.16.0.0/12 logdrop # RFC 1918
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192.168.0.0/16 logdrop # RFC 1918
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10.0.0.0/8 logdrop # RFC 1918
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#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE
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</programlisting>
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</blockquote>
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</section>
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<section>
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<title>Policy File</title>
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<blockquote>
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<programlisting>#SOURCE DESTINATION POLICY LOG LEVEL BURST:LIMIT
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$FW $FW ACCEPT
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loc net ACCEPT
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$FW vpn ACCEPT
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vpn net ACCEPT
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vpn loc ACCEPT
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sec vpn ACCEPT
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vpn sec ACCEPT
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sec loc ACCEPT
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loc sec ACCEPT
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fw sec ACCEPT
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sec net ACCEPT
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Wifi sec NONE
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sec Wifi NONE
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fw Wifi ACCEPT
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loc vpn ACCEPT
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$FW loc ACCEPT #Firewall to Local
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loc $FW REJECT $LOG
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net all DROP $LOG 10/sec:40
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all all REJECT $LOG
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#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE</programlisting>
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</blockquote>
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</section>
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<section>
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<title>Masq File</title>
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<blockquote>
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<para>Although most of our internal systems use one-to-one NAT, my
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wife's system (192.168.1.4) uses IP Masquerading (actually SNAT) as do
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our wireless network systems and visitors with laptops.</para>
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<para>The first entry allows access to the DSL modem and uses features
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introduced in Shorewall 2.1.1. The leading plus sign ("+_") causes the
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rule to be placed before rules generated by the /etc/shorewall/nat
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file below. The double colons ("::") cause the entry to be exempt from
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ADD_SNAT_ALIASES=Yes in my shorewall.conf file above.</para>
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<note>
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<para>My use of ADD_SNAT_ALIASES=Yes is an anachronism. I previously
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used 206.124.146.179 as the SNAT address before I configured a
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system outside the firewall with that IP address.
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ADD_SNAT_ALIASES=Yes was used to add 206.124.146.179 as an IP
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address on the external interface.</para>
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</note>
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<programlisting>#INTERFACE SUBNET ADDRESS PROTO PORT
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+$EXT_IF::192.168.1.1 0.0.0.0/0 192.168.1.254
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$EXT_IF:: 192.168.0.0/22 206.124.146.176
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$DMZ_IF:: 206.124.146.176 192.168.1.254 tcp 80
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#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE</programlisting>
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</blockquote>
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</section>
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<section>
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<title>NAT File</title>
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<blockquote>
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<programlisting>#EXTERNAL INTERFACE INTERNAL ALL INTERFACES LOCAL
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206.124.146.178 $EXT_IF:0 192.168.1.5 No No
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206.124.146.180 $EXT_IF:1 192.168.1.6 No No
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#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE</programlisting>
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</blockquote>
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</section>
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<section id="ProxyARP">
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<title>Proxy ARP File</title>
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<blockquote>
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<para>I configure the host route to 206.124.146.177 on <filename
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class="devicefile">eth1</filename> in <link
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linkend="debian_interfaces">/etc/network/interfaces</link>.</para>
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<programlisting>#ADDRESS INTERFACE EXTERNAL HAVEROUTE PERSISTENT
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206.124.146.177 $DMZ_IF $EXT_IF yes
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192.168.1.1 $EXT_IF $INT_IF yes # Allow access to DSL modem from the local zone
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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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<section>
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<title>Tunnels</title>
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<blockquote>
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<programlisting>#TYPE ZONE GATEWAY GATEWAY ZONE PORT
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openvpn:1194 net 0.0.0.0/0
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ipsec net 0.0.0.0/0 sec
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openvpn:1194 Wifi 192.168.3.0/24
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ipsec Wifi 192.168.3.0/24 sec
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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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|
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<section id="Actions">
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<title>Actions File</title>
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|
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<blockquote>
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<programlisting>#ACTION
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Mirrors #Accept traffic from the Shorewall Mirror sites
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SSHKnock #Port Knocking
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#LAST LINE - ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE</programlisting>
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</blockquote>
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</section>
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<section>
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<title>action.Mirrors File</title>
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|
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<blockquote>
|
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<para>The <emphasis>Mirrors</emphasis> and
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<emphasis>Mirrornets</emphasis> <ulink
|
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url="ipsets.html">ipsets</ulink> define the set of Shorewall
|
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mirrors.</para>
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|
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<programlisting>#TARGET SOURCE DEST PROTO DEST SOURCE ORIGINAL RATE
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# PORT PORT(S) DEST LIMIT
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ACCEPT +Mirrors
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ACCEPT +Mirrornets
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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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|
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<section>
|
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<title>Rules File (The shell variables are set in
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/etc/shorewall/params)</title>
|
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|
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<blockquote>
|
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<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 NEW
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REJECT:$LOG loc net tcp 25
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REJECT:$LOG loc net udp 1025:1031
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#
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|
# Stop NETBIOS crap
|
|
#
|
|
REJECT loc net tcp 137,445
|
|
REJECT loc net udp 137:139
|
|
REJECT sec net tcp 137,445
|
|
REJECT sec 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
|
|
DROP Wifi net:15.0.0.0/8
|
|
DROP Wifi net:16.0.0.0/8
|
|
###############################################################################################################################################################################
|
|
# 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 ssh,time,631,8080
|
|
ACCEPT loc fw udp 161,ntp,631
|
|
DROP loc fw tcp 3185 #SuSE Meta pppd
|
|
Ping/ACCEPT loc fw
|
|
###############################################################################################################################################################################
|
|
# Secure wireless to Firewall
|
|
#
|
|
ACCEPT sec fw tcp ssh,time,631,8080
|
|
ACCEPT sec fw udp 161,ntp,631
|
|
DROP sec fw tcp 3185 #SuSE Meta pppd
|
|
Ping/ACCEPT sec fw
|
|
###############################################################################################################################################################################
|
|
# Roadwarriors to Firewall
|
|
#
|
|
ACCEPT vpn fw tcp ssh,time,631,8080
|
|
ACCEPT vpn fw udp 161,ntp,631
|
|
Ping/ACCEPT vpn fw
|
|
###############################################################################################################################################################################
|
|
# Local Network to DMZ
|
|
#
|
|
DNAT- loc dmz:206.124.146.177:3128 \
|
|
tcp www - !206.124.146.177,192.168.1.1
|
|
DROP loc:!192.168.0.0/22 dmz
|
|
ACCEPT loc dmz udp domain,xdmcp
|
|
ACCEPT loc dmz tcp www,smtp,smtps,domain,ssh,imap,https,imaps,ftp,10023,pop3,3128 -
|
|
Ping/ACCEPT loc dmz
|
|
###############################################################################################################################################################################
|
|
# Insecure Wireless to DMZ
|
|
#
|
|
|
|
ACCEPT Wifi dmz udp domain
|
|
ACCEPT Wifi dmz tcp domain
|
|
###############################################################################################################################################################################
|
|
# Insecure Wireless to Internet
|
|
#
|
|
ACCEPT Wifi net udp 500
|
|
ACCEPT Wifi net udp 4500
|
|
Ping/ACCEPT Wifi net
|
|
###############################################################################################################################################################################
|
|
# Secure Wireless to DMZ
|
|
#
|
|
DROP sec:!192.168.0.0/22 dmz
|
|
DNAT sec dmz:206.124.146.177:3128 \
|
|
tcp www - !206.124.146.177,192.168.1.1
|
|
ACCEPT sec dmz udp domain,xdmcp
|
|
ACCEPT sec dmz tcp www,smtp,smtps,domain,ssh,imap,https,imaps,ftp,10023,pop3 -
|
|
Ping/ACCEPT sec dmz
|
|
###############################################################################################################################################################################
|
|
# 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
|
|
###############################################################################################################################################################################
|
|
# 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
|
|
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
|
|
ACCEPT net dmz tcp 22
|
|
Ping/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
|
|
ACCEPT net:$OMAK loc:192.168.1.5 tcp 22
|
|
#
|
|
# Auth for IRC
|
|
#
|
|
ACCEPT net loc:192.168.1.5 tcp 113
|
|
#
|
|
# Real Audio
|
|
#
|
|
ACCEPT net loc:192.168.1.5 udp 6970:7170
|
|
#
|
|
# Overnet
|
|
#
|
|
#ACCEPT net loc:192.168.1.5 tcp 4662
|
|
#ACCEPT net loc:192.168.1.5 udp 12112
|
|
#
|
|
# OpenVPN
|
|
#
|
|
ACCEPT net loc:192.168.1.5 udp 1194
|
|
#
|
|
# 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 smtp,domain,www,81,https,whois,echo,2702,21,2703,ssh,8080,cvspserver
|
|
REJECT:$LOG dmz net udp 1025:1031
|
|
ACCEPT dmz net:$POPSERVERS tcp pop3
|
|
#
|
|
#
|
|
# OpenVPN
|
|
#
|
|
ACCEPT net loc:192.168.1.5 udp 1194
|
|
#
|
|
# Silently Handle common probes
|
|
#
|
|
REJECT net loc tcp www,ftp,https
|
|
DROP net loc icmp 8
|
|
###############################################################################################################################################################################
|
|
# DMZ to Firewall -- ntp & snmp, Silently reject Auth
|
|
#
|
|
ACCEPT dmz fw udp ntp ntp
|
|
ACCEPT dmz fw tcp 161,ssh
|
|
ACCEPT dmz fw udp 161
|
|
REJECT dmz fw tcp auth
|
|
Ping/ACCEPT dmz fw
|
|
###############################################################################################################################################################################
|
|
# DMZ to Local Network
|
|
#
|
|
ACCEPT dmz loc tcp smtp,6001:6010
|
|
ACCEPT dmz:206.124.146.177 loc:192.168.1.5,192.168.1.3 \
|
|
tcp 111
|
|
ACCEPT dmz:206.124.146.177 loc:192.168.1.5,192.168.1.3 \
|
|
udp
|
|
Ping/ACCEPT dmz loc
|
|
###############################################################################################################################################################################
|
|
# Internet to Firewall
|
|
#
|
|
REJECT net fw tcp www,ftp,https
|
|
DROP net fw icmp 8
|
|
ACCEPT net fw udp 33434:33454
|
|
ACCEPT net:$OMAK fw udp ntp
|
|
ACCEPT net fw tcp auth
|
|
SSHKnock:info net fw tcp 22,4320,4321,4322
|
|
###############################################################################################################################################################################
|
|
# Firewall to Internet
|
|
#
|
|
ACCEPT fw net:$NTPSERVERS udp ntp ntp
|
|
#ACCEPT fw net:$POPSERVERS tcp pop3
|
|
ACCEPT fw net udp domain
|
|
ACCEPT fw net tcp domain,www,https,ssh,1723,whois,1863,ftp,2702,2703,7
|
|
ACCEPT fw net udp 33435:33535
|
|
ACCEPT fw net icmp
|
|
REJECT:$LOG fw net udp 1025:1031
|
|
DROP fw net udp ntp
|
|
Ping/ACCEPT fw net
|
|
###############################################################################################################################################################################
|
|
# Firewall to DMZ
|
|
#
|
|
ACCEPT fw dmz tcp www,ftp,ssh,smtp,993,465
|
|
ACCEPT fw dmz udp domain
|
|
REJECT fw dmz udp 137:139
|
|
Ping/ACCEPT fw dmz
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE
|
|
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>/etc/shorewall/tcdevices</title>
|
|
|
|
<blockquote>
|
|
<programlisting>#INTERFACE IN-BANDWITH OUT-BANDWIDTH
|
|
$EXT_IF 1.5mbit 384kbit
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>/etc/shorewall/tcclasses</title>
|
|
|
|
<blockquote>
|
|
<para>My traffic shaping configuration is the "WonderShaper" <ulink
|
|
url="http://www1.shorewall.net/pub/shorewall/Samples/tc4shorewall">example
|
|
from tc4shorewall</ulink>.</para>
|
|
|
|
<programlisting>#INTERFACE MARK RATE CEIL PRIORITY OPTIONS
|
|
$EXT_IF 10 100kbit full 1 tcp-ack,tos-minimize-delay
|
|
$EXT_IF 20 100kbit 200kbit 2
|
|
$EXT_IF 30 full/3 full/2 3 default
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>/etc/shorewall/tcrules</title>
|
|
|
|
<blockquote>
|
|
<para>I give full bandwidth to my L2TP/IPSEC VPN -- only seems fair
|
|
since HP pays for the DSL service.</para>
|
|
|
|
<programlisting>#MARK SOURCE DEST PROTO PORT(S) CLIENT USER TEST
|
|
# PORT(S)
|
|
10:F 192.168.1.6 $EXT_IF udp 4500
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section id="debian_interfaces">
|
|
<title>/etc/network/interfaces</title>
|
|
|
|
<para>This file is Debian-specific and defines the configuration of the
|
|
network interfaces.</para>
|
|
|
|
<blockquote>
|
|
<programlisting># The loopback network interface
|
|
auto lo
|
|
iface lo inet loopback
|
|
|
|
# DMZ interface -- After the interface is up, add a route to the server. This allows the 'Yes' setting
|
|
# in the HAVEROUTE column of /etc/shorewall/proxyarp above.
|
|
|
|
auto eth1
|
|
iface eth1 inet static
|
|
address 206.124.146.176
|
|
netmask 255.255.255.255
|
|
broadcast 0.0.0.0
|
|
up ip route add 206.124.146.177 dev eth1
|
|
|
|
# Internet interface -- After the interface is up, add a route to the Westell 2200 DSL "Modem"
|
|
|
|
auto eth2
|
|
iface eth2 inet static
|
|
address 206.124.146.176
|
|
netmask 255.255.255.0
|
|
gateway 206.124.146.254
|
|
up ip route add 192.168.1.1 dev eth2
|
|
|
|
# Wireless interface
|
|
|
|
auto eth0
|
|
iface eth0 inet static
|
|
address 192.168.3.254
|
|
netmask 255.255.255.0
|
|
|
|
# LAN interface
|
|
|
|
auto eth3
|
|
iface eth3 inet static
|
|
address 192.168.1.254
|
|
netmask 255.255.255.0</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>/etc/racoon/racoon.conf</title>
|
|
|
|
<blockquote>
|
|
<programlisting>listen
|
|
{
|
|
isakmp 206.124.146.176 ;
|
|
isakmp 192.168.3.254 ;
|
|
isakmp_natt 206.124.146.176 [4500] ;
|
|
adminsock "/usr/local/var/racoon/racoon.sock" "root" "operator" 0660 ;
|
|
}
|
|
#
|
|
# Tipper at Home
|
|
#
|
|
remote 192.168.3.8
|
|
{
|
|
exchange_mode main ;
|
|
dpd_delay 20 ;
|
|
certificate_type x509 "gateway.pem" "gateway_key.pem" ;
|
|
verify_cert on ;
|
|
my_identifier asn1dn ;
|
|
peers_identifier asn1dn ;
|
|
verify_identifier on ;
|
|
lifetime time 30 minutes ;
|
|
proposal {
|
|
encryption_algorithm blowfish ;
|
|
hash_algorithm sha1 ;
|
|
authentication_method rsasig ;
|
|
dh_group 2 ;
|
|
}
|
|
}
|
|
|
|
sainfo address 0.0.0.0/0 any address 192.168.3.8 any
|
|
{
|
|
pfs_group 2 ;
|
|
lifetime time 30 minutes ;
|
|
encryption_algorithm blowfish ;
|
|
authentication_algorithm hmac_sha1, hmac_md5 ;
|
|
compression_algorithm deflate ;
|
|
}
|
|
#
|
|
# Work Laptop at Home -- it doesn't like getting proposals from us
|
|
# so we let it initiate the tunnel.
|
|
#
|
|
# Windows XP doesn't support blowfish or rijndal
|
|
# so we're stuck with 3des :-(
|
|
#
|
|
remote 192.168.3.6 inherit 192.168.3.8
|
|
{
|
|
proposal_check obey ;
|
|
passive on ;
|
|
generate_policy on ;
|
|
proposal {
|
|
encryption_algorithm 3des ;
|
|
hash_algorithm sha1 ;
|
|
authentication_method rsasig ;
|
|
dh_group 2 ;
|
|
}
|
|
}
|
|
|
|
sainfo address 0.0.0.0/0 any address 192.168.3.6 any
|
|
{
|
|
pfs_group 2 ;
|
|
lifetime time 1 hour ;
|
|
encryption_algorithm 3des ;
|
|
authentication_algorithm hmac_sha1, hmac_md5 ;
|
|
compression_algorithm deflate ;
|
|
}
|
|
#
|
|
# Both systems on the road -- We use 3des for phase I to accomodate XP.
|
|
# Since we don't know the IP address of the
|
|
# remote host ahead of time, we must use
|
|
# "anonymous".
|
|
#
|
|
remote anonymous inherit 192.168.3.6
|
|
{
|
|
nat_traversal on ;
|
|
ike_frag on;
|
|
}
|
|
|
|
sainfo anonymous
|
|
{
|
|
pfs_group 2;
|
|
lifetime time 12 hour ;
|
|
encryption_algorithm blowfish, 3des;
|
|
authentication_algorithm hmac_sha1, hmac_md5 ;
|
|
compression_algorithm deflate ;
|
|
}</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>/etc/racoon/setkey.conf</title>
|
|
|
|
<blockquote>
|
|
<programlisting># First of all flush the SAD and SPD databases
|
|
|
|
flush;
|
|
spdflush;
|
|
|
|
# We only define policies for 'tipper'. The XP box seems to work better when it initiates the
|
|
# negotiation so we essentially run it like a roadwarrior even around the house.
|
|
|
|
spdadd 0.0.0.0/0 192.168.3.8/32 any -P out ipsec esp/tunnel/192.168.3.254-192.168.3.8/require;
|
|
spdadd 192.168.3.8/32 0.0.0.0/0 any -P in ipsec esp/tunnel/192.168.3.8-192.168.3.254/require;</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
</section>
|
|
|
|
<section>
|
|
<title>Tipper Configuration while at Home</title>
|
|
|
|
<para>This laptop is either configured on our wireless network
|
|
(192.168.3.8) or as a standalone system on the road. While this system is
|
|
connected via our wireless network, it uses IPSEC tunnel mode for all
|
|
access.</para>
|
|
|
|
<note>
|
|
<para>Given that I use OpenVPN for remote access, it would be more
|
|
convenient to also use it for wireless access at home. I use IPSEC just
|
|
so that I always have a working IPSEC testbed.</para>
|
|
</note>
|
|
|
|
<para>Tipper's view of the world is shown in the following diagram:</para>
|
|
|
|
<graphic align="center" fileref="images/network2.png" valign="middle" />
|
|
|
|
<para>The key configuration files are shown in the following
|
|
sections.</para>
|
|
|
|
<section>
|
|
<title>zones</title>
|
|
|
|
<blockquote>
|
|
<programlisting>#ZONE DISPLAY COMMENTS
|
|
home Home Shorewall Network
|
|
net Net Internet
|
|
#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE
|
|
</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>policy</title>
|
|
|
|
<blockquote>
|
|
<programlisting>#SOURCE DEST POLICY LOG LEVEL LIMIT:BURST
|
|
$FW net ACCEPT
|
|
$FW home ACCEPT
|
|
home $FW ACCEPT
|
|
net home NONE
|
|
home net NONE
|
|
net all DROP info
|
|
# The FOLLOWING POLICY MUST BE LAST
|
|
all all REJECT info
|
|
#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>interfaces</title>
|
|
|
|
<blockquote>
|
|
<programlisting>#ZONE INTERFACE BROADCAST OPTIONS
|
|
net eth0 detect dhcp,tcpflags
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>ipsec</title>
|
|
|
|
<blockquote>
|
|
<programlisting>#ZONE IPSEC OPTIONS IN OUT
|
|
# ONLY OPTIONS OPTIONS
|
|
home yes mode=tunnel
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>hosts</title>
|
|
|
|
<blockquote>
|
|
<programlisting>#ZONE HOST(S) OPTIONS
|
|
home eth0:0.0.0.0/0
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS LINE -- DO NOT REMOVE</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>rules</title>
|
|
|
|
<blockquote>
|
|
<programlisting>#ACTION SOURCE DEST PROTO DEST SOURCE ORIGINAL RATE USER/
|
|
# PORT PORT(S) DEST LIMIT GROUP
|
|
ACCEPT net $FW icmp 8
|
|
ACCEPT net $FW tcp 22
|
|
ACCEPT net $FW tcp 4000:4100
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>/etc/racoon/setkey.conf</title>
|
|
|
|
<blockquote>
|
|
<programlisting>flush;
|
|
spdflush;
|
|
|
|
# Policies for while we're connected via Wireless at home
|
|
|
|
spdadd 192.168.3.8/32 192.168.3.8/32 any -P in none;
|
|
spdadd 192.168.3.8/32 192.168.3.8/32 any -P out none;
|
|
spdadd 127.0.0.0/8 127.0.0.0/8 any -P in none;
|
|
spdadd 127.0.0.0/8 127.0.0.0/8 any -P out none;
|
|
spdadd 0.0.0.0/0 192.168.3.8/32 any -P in ipsec esp/tunnel/192.168.3.254-192.168.3.8/require;
|
|
spdadd 192.168.3.8/32 0.0.0.0/0 any -P out ipsec esp/tunnel/192.168.3.8-192.168.3.254/require;
|
|
</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>/etc/racoon/racoon.conf</title>
|
|
|
|
<blockquote>
|
|
<programlisting>path certificate "/etc/certs";
|
|
|
|
listen
|
|
{
|
|
isakmp 192.168.3.8;
|
|
}
|
|
|
|
remote 192.168.3.254
|
|
{
|
|
exchange_mode main ;
|
|
certificate_type x509 "tipper.pem" "tipper_key.pem";
|
|
verify_cert on;
|
|
my_identifier asn1dn ;
|
|
peers_identifier asn1dn ;
|
|
verify_identifier on ;
|
|
lifetime time 30 minutes ;
|
|
proposal {
|
|
encryption_algorithm blowfish ;
|
|
hash_algorithm sha1;
|
|
authentication_method rsasig ;
|
|
dh_group 2 ;
|
|
}
|
|
}
|
|
|
|
sainfo address 192.168.3.8/32 any address 0.0.0.0/0 any
|
|
{
|
|
pfs_group 2;
|
|
lifetime time 30 minutes ;
|
|
encryption_algorithm blowfish ;
|
|
authentication_algorithm hmac_sha1, hmac_md5 ;
|
|
compression_algorithm deflate ;
|
|
}</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
</section>
|
|
|
|
<section>
|
|
<title>Tipper Configuration on the Road</title>
|
|
|
|
<para>When Tipper is on the road, it's world view is the same as in the
|
|
diagram above.</para>
|
|
|
|
<section>
|
|
<title>zones</title>
|
|
|
|
<blockquote>
|
|
<programlisting>#ZONE DISPLAY COMMENTS
|
|
home Home Shorewall Network
|
|
net Net Internet
|
|
#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE
|
|
</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>policy</title>
|
|
|
|
<blockquote>
|
|
<programlisting>#SOURCE DEST POLICY LOG LEVEL LIMIT:BURST
|
|
$FW net ACCEPT
|
|
$FW home ACCEPT
|
|
home $FW ACCEPT
|
|
net home NONE
|
|
home net NONE
|
|
net all DROP info
|
|
# The FOLLOWING POLICY MUST BE LAST
|
|
all all REJECT info
|
|
#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>interfaces</title>
|
|
|
|
<blockquote>
|
|
<programlisting>#ZONE INTERFACE BROADCAST OPTIONS
|
|
net eth0 detect dhcp,tcpflags
|
|
home tun0 -
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>rules</title>
|
|
|
|
<blockquote>
|
|
<programlisting>#ACTION SOURCE DEST PROTO DEST SOURCE ORIGINAL RATE USER/
|
|
# PORT PORT(S) DEST LIMIT GROUP
|
|
ACCEPT net $FW icmp 8
|
|
ACCEPT net $FW tcp 22
|
|
ACCEPT net $FW tcp 4000:4100
|
|
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>/etc/openvpn/home.conf</title>
|
|
|
|
<blockquote>
|
|
<programlisting>dev tun
|
|
remote gateway.shorewall.net
|
|
up /etc/openvpn/home.up
|
|
|
|
tls-client
|
|
pull
|
|
|
|
ca /etc/certs/cacert.pem
|
|
|
|
cert /etc/certs/tipper.pem
|
|
key /etc/certs/tipper_key.pem
|
|
|
|
port 1194
|
|
|
|
user nobody
|
|
group nogroup
|
|
|
|
comp-lzo
|
|
|
|
ping 15
|
|
ping-restart 45
|
|
ping-timer-rem
|
|
persist-tun
|
|
persist-key
|
|
|
|
verb 3</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
|
|
<section>
|
|
<title>/etc/openvpn/home.up</title>
|
|
|
|
<blockquote>
|
|
<programlisting>#!/bin/bash
|
|
|
|
ip route add 192.168.1.0/24 via $5 #Access to Home Network
|
|
ip route add 206.124.146.177/32 via $5 #So that DNS names will resolve in my
|
|
#Internal Bind 9 view because the source IP will
|
|
#be in 192.168.2.0/24</programlisting>
|
|
</blockquote>
|
|
</section>
|
|
</section>
|
|
</article> |