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fixed ... (bye-bye kxml)

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git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@2179 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
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judas_iscariote 2005-05-27 00:03:47 +00:00
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Shorewall-docs2/Shorewall_Squid_Usage.xml
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<?xml version = '1.0' encoding = 'UTF-8'?> <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> <!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
<article id="Shorewall_Squid_Usage" > "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--$Id$--> <articleinfo> <article id="Shorewall_Squid_Usage">
<!--$Id$-->
<articleinfo>
<title>Using Shorewall with Squid</title> <title>Using Shorewall with Squid</title>
<authorgroup> <authorgroup>
<author> <author>
<firstname>Tom</firstname> <firstname>Tom</firstname>
<surname>Eastep</surname> <surname>Eastep</surname>
</author> </author>
</authorgroup> </authorgroup>
<pubdate>2005-05-19</pubdate>
<pubdate>2005-05-26</pubdate>
<copyright> <copyright>
<year>2003-2005</year> <year>2003-2005</year>
<holder>Thomas M. Eastep</holder> <holder>Thomas M. Eastep</holder>
</copyright> </copyright>
<legalnotice> <legalnotice>
<para>Permission is granted to copy, distribute and/or modify this <para>Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version document under the terms of the GNU Free Documentation License, Version
1.2 or any later version published by the Free Software Foundation; with 1.2 or any later version published by the Free Software Foundation; with
no Invariant Sections, with no Front-Cover, and with no Back-Cover no Invariant Sections, with no Front-Cover, and with no Back-Cover
Texts. A copy of the license is included in the section entitled Texts. A copy of the license is included in the section entitled <quote>
<quote> <ulink url="GnuCopyright.htm">GNU Free Documentation License</ulink>
<ulink url="GnuCopyright.htm" >GNU Free Documentation
License</ulink>
</quote>.</para> </quote>.</para>
</legalnotice> </legalnotice>
</articleinfo> </articleinfo>
<para>This page covers Shorewall configuration to use with <ulink url="http://www.squid-cache.org" >Squid</ulink> running as a Transparent
<para>This page covers Shorewall configuration to use with <ulink
url="http://www.squid-cache.org">Squid</ulink> running as a Transparent
Proxy or as a Manual Proxy.</para> Proxy or as a Manual Proxy.</para>
<warning> <warning>
<para>This documentation assumes that you are running Shorewall 2.0.0 or <para>This documentation assumes that you are running Shorewall 2.0.0 or
later.</para> later.</para>
</warning> </warning>
<section> <section>
<title>Squid as a Transparent Proxy</title> <title>Squid as a Transparent Proxy</title>
<important> <important>
<para>This section gives instructions for transparent proxying of HTTP. <para>This section gives instructions for transparent proxying of HTTP.
HTTPS (normally TCP port 443) <emphasis role="bold" >cannot</emphasis> be HTTPS (normally TCP port 443) <emphasis role="bold">cannot</emphasis> be
proxied transparently (stop and think about it for a minute; if HTTPS proxied transparently (stop and think about it for a minute; if HTTPS
could be transparently proxied, then how secure would it be?).</para> could be transparently proxied, then how secure would it be?).</para>
</important> </important>
<caution> <caution>
<para>Please observe the following general requirements:</para> <para>Please observe the following general requirements:</para>
<itemizedlist> <itemizedlist>
<listitem> <listitem>
<para>In all cases, Squid should be configured to run as a transrent <para>In all cases, Squid should be configured to run as a transrent
proxy as described at <ulink url="http://www.tldp.org/HOWTO/mini/TransparentProxy.html" >http://www.tldp.org/HOWTO/mini/TransparentProxy.html</ulink>.</para> proxy as described at <ulink
url="http://www.tldp.org/HOWTO/mini/TransparentProxy.html">http://www.tldp.org/HOWTO/mini/TransparentProxy.html</ulink>.</para>
</listitem> </listitem>
<listitem> <listitem>
<para>Depending on your distribution, other Squid configuration <para>Depending on your distribution, other Squid configuration
changes may be required. These changes typically consist of:</para> changes may be required. These changes typically consist of:</para>
<orderedlist> <orderedlist>
<listitem> <listitem>
<para>Adding an ACL that represents the clients on your local <para>Adding an ACL that represents the clients on your local
network.</para> network.</para>
<para>Example:</para> <para>Example:</para>
<programlisting>ACL my_networks src 192.168.1.0/24 192.168.2.0/24</programlisting> <programlisting>ACL my_networks src 192.168.1.0/24 192.168.2.0/24</programlisting>
</listitem> </listitem>
<listitem> <listitem>
<para>Allowing HTTP access to that ACL.</para> <para>Allowing HTTP access to that ACL.</para>
<para>Example:</para> <para>Example:</para>
<programlisting>http_access allow my_networks</programlisting> <programlisting>http_access allow my_networks</programlisting>
</listitem> </listitem>
</orderedlist> </orderedlist>
<para>See your distribution's Squid documenation and <ulink url="http://www.squid-cache.org/" >http://www.squid-cache.org/</ulink>
<para>See your distribution's Squid documenation and <ulink
url="http://www.squid-cache.org/">http://www.squid-cache.org/</ulink>
for details.</para> for details.</para>
<para>It is a good idea to get Squid working as a <link linkend="Manual" >manual proxy</link> first before you try
<para>It is a good idea to get Squid working as a <link
linkend="Manual">manual proxy</link> first before you try
transparent proxying.</para> transparent proxying.</para>
</listitem> </listitem>
<listitem> <listitem>
<para>The following instructions mention the files <para>The following instructions mention the files
/etc/shorewall/start and /etc/shorewall/init -- if you don't have /etc/shorewall/start and /etc/shorewall/init -- if you don't have
those files, siimply create them.</para> those files, siimply create them.</para>
</listitem> </listitem>
<listitem> <listitem>
<para>When the Squid server is in the DMZ zone or in the local zone, <para>When the Squid server is in the DMZ zone or in the local zone,
that zone must be defined ONLY by its interface -- no that zone must be defined ONLY by its interface -- no
@ -80,280 +108,320 @@
routed to the Squid server still have their original destination IP routed to the Squid server still have their original destination IP
addresses.</para> addresses.</para>
</listitem> </listitem>
<listitem> <listitem>
<para>You must have iptables installed on your Squid server.</para> <para>You must have iptables installed on your Squid server.</para>
</listitem> </listitem>
</itemizedlist> </itemizedlist>
</caution> </caution>
<caution> <caution>
<para>In the instructions below, only TCP Port 80 is opened from the <para>In the instructions below, only TCP Port 80 is opened from the
system running Squid to the internet. If your users require browsing system running Squid to the Internet. If your users require browsing
sites that use a port other than 80 (e.g., sites that use a port other than 80 (e.g.,
http://www.domain.tld:<emphasis role="bold" >8080</emphasis>) then you http://www.domain.tld:<emphasis role="bold">8080</emphasis>) then you
must open those ports as well.</para> must open those ports as well.</para>
</caution> </caution>
</section> </section>
<section> <section>
<title>Configurations</title> <title>Configurations</title>
<para>Three different configurations are covered:</para> <para>Three different configurations are covered:</para>
<simplelist> <simplelist>
<member>Squid (transparent) Running on the Firewall</member> <member>Squid (transparent) Running on the Firewall</member>
<member>Squid (transparent) Running in the local Network</member> <member>Squid (transparent) Running in the local Network</member>
<member>Squid (transparent) Running in a DMZ</member> <member>Squid (transparent) Running in a DMZ</member>
</simplelist> </simplelist>
<section id="Firewall" >
<section id="Firewall">
<title>Squid (transparent) Running on the Firewall</title> <title>Squid (transparent) Running on the Firewall</title>
<para>You want to redirect all local www connection requests EXCEPT <para>You want to redirect all local www connection requests EXCEPT
those to your own http server (206.124.146.177) to a Squid transparent those to your own http server (206.124.146.177) to a Squid transparent
proxy running on the firewall and listening on port 3128. Squid will of proxy running on the firewall and listening on port 3128. Squid will of
course require access to remote web servers.</para> course require access to remote web servers.</para>
<para>In <filename>/etc/shorewall/rules</filename>:</para> <para>In <filename>/etc/shorewall/rules</filename>:</para>
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S) SOURCE ORIGINAL <programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S) SOURCE ORIGINAL
# PORT(S) DEST # PORT(S) DEST
REDIRECT loc 3128 tcp www - !206.124.146.177 REDIRECT loc 3128 tcp www - !206.124.146.177
ACCEPT fw net tcp www</programlisting> ACCEPT fw net tcp www</programlisting>
<para>There may be a requirement to exclude additional destination hosts <para>There may be a requirement to exclude additional destination hosts
or networks from being redirected. For example, you might also want or networks from being redirected. For example, you might also want
requests destined for 130.252.100.0/24 to not be routed to Squid.</para> requests destined for 130.252.100.0/24 to not be routed to Squid.</para>
<para>If needed, you may just add the additional hosts/networks to the <para>If needed, you may just add the additional hosts/networks to the
ORIGINAL DEST column in your REDIRECT rule.</para> ORIGINAL DEST column in your REDIRECT rule.</para>
<para>
<filename>/etc/shorewall/rules</filename>:<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S) SOURCE ORIGINAL <para><filename>/etc/shorewall/rules</filename>:<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S) SOURCE ORIGINAL
# PORT(S) DEST # PORT(S) DEST
REDIRECT loc 3128 tcp www - !206.124.146.177,130.252.100.0/24</programlisting> REDIRECT loc 3128 tcp www - !206.124.146.177,130.252.100.0/24</programlisting></para>
</para>
</section> </section>
<section id="Local" >
<section id="Local">
<title>Squid (transparent) Running in the local network</title> <title>Squid (transparent) Running in the local network</title>
<para>You want to redirect all local www connection requests to a Squid <para>You want to redirect all local www connection requests to a Squid
transparent proxy running in your local zone at 192.168.1.3 and transparent proxy running in your local zone at 192.168.1.3 and
listening on port 3128. Your local interface is eth1. There may also be listening on port 3128. Your local interface is eth1. There may also be
a web server running on 192.168.1.3. It is assumed that web access is a web server running on 192.168.1.3. It is assumed that web access is
already enabled from the local zone to the internet.</para> already enabled from the local zone to the internet.</para>
<para>If you are running a Shorewall version earlier than 2.3.2 OR your <para>If you are running a Shorewall version earlier than 2.3.2 OR your
kernel and/or iptables do not have <ulink url="Shorewall_and_Routing.html#RouteTarget" >ROUTE target kernel and/or iptables do not have <ulink
url="Shorewall_and_Routing.html#RouteTarget">ROUTE target
support</ulink> then:</para> support</ulink> then:</para>
<orderedlist> <orderedlist>
<listitem> <listitem>
<para>On your firewall system, issue the following command</para> <para>On your firewall system, issue the following command</para>
<programlisting>
<command>echo 202 www.out >> /etc/iproute2/rt_tables</command> <programlisting><command>echo 202 www.out &gt;&gt; /etc/iproute2/rt_tables</command> </programlisting>
</programlisting>
</listitem> </listitem>
<listitem> <listitem>
<para>Create <filename>/etc/shorewall/addroutes</filename> as <para>Create <filename>/etc/shorewall/addroutes</filename> as
follows:</para> follows:</para>
<programlisting>
<command>#!/bin/sh
if [ -z &quot;`ip rule list | grep www.out`&quot; ] ; then <programlisting><command>#!/bin/sh
if [ -z "`ip rule list | grep www.out`" ] ; then
ip rule add fwmark 0xCA table www.out # Note 0xCA = 202 ip rule add fwmark 0xCA table www.out # Note 0xCA = 202
ip route add default via 192.168.1.3 dev eth1 table www.out ip route add default via 192.168.1.3 dev eth1 table www.out
ip route flush cache ip route flush cache
echo 0 > /proc/sys/net/ipv4/conf/eth1/send_redirects echo 0 &gt; /proc/sys/net/ipv4/conf/eth1/send_redirects
fi</command> fi</command> </programlisting>
</programlisting>
</listitem> </listitem>
<listitem> <listitem>
<para>Make <filename>/etc/shorewall/addroutes </filename>executable <para>Make <filename>/etc/shorewall/addroutes </filename>executable
via:</para> via:</para>
<programlisting>
<command>chmod +x /etc/shorewall/addroutes</command> <programlisting><command>chmod +x /etc/shorewall/addroutes</command> </programlisting>
</programlisting>
</listitem> </listitem>
<listitem> <listitem>
<para>In /etc/shorewall/init, put:</para> <para>In /etc/shorewall/init, put:</para>
<programlisting>
<command>run_and_save_command &quot;/etc/shorewall/addroutes&quot;</command> <programlisting><command>run_and_save_command "/etc/shorewall/addroutes"</command> </programlisting>
</programlisting>
</listitem> </listitem>
</orderedlist> </orderedlist>
<para>If you are running Shorewall 2.3.2 or later:</para> <para>If you are running Shorewall 2.3.2 or later:</para>
<orderedlist> <orderedlist>
<listitem> <listitem>
<para>Add this entry to your /etc/shorewall/providers file.</para> <para>Add this entry to your /etc/shorewall/providers file.</para>
<programlisting>#NAME NUMBER MARK DUPLICATE INTERFACE GATEWAY OPTIONS <programlisting>#NAME NUMBER MARK DUPLICATE INTERFACE GATEWAY OPTIONS
Squid 1 202 - eth1 192.168.1.3 -</programlisting> Squid 1 202 - eth1 192.168.1.3 -</programlisting>
</listitem> </listitem>
</orderedlist> </orderedlist>
<para>Regardless of your Shorewall version, you need the <para>Regardless of your Shorewall version, you need the
following:</para> following:</para>
<orderedlist> <orderedlist>
<listitem> <listitem>
<para>In <filename>/etc/shorewall/start</filename> add:</para> <para>In <filename>/etc/shorewall/start</filename> add:</para>
<programlisting>
<command>iptables -t mangle -A PREROUTING -i eth1 -s ! 192.168.1.3 -p tcp --dport 80 -j MARK --set-mark 202</command> <programlisting><command>iptables -t mangle -A PREROUTING -i eth1 -s ! 192.168.1.3 -p tcp --dport 80 -j MARK --set-mark 202</command> </programlisting>
</programlisting>
</listitem> </listitem>
<listitem> <listitem>
<para>In <para>In <filename> <filename>/etc/shorewall/interfaces</filename>
<filename>
<filename>/etc/shorewall/interfaces</filename>
</filename>:</para> </filename>:</para>
<programlisting>#ZONE INTERFACE BROADCAST OPTIONS <programlisting>#ZONE INTERFACE BROADCAST OPTIONS
loc eth1 detect <emphasis role="bold" >routeback</emphasis> loc eth1 detect <emphasis role="bold">routeback</emphasis> </programlisting>
</programlisting>
</listitem> </listitem>
<listitem> <listitem>
<para>In /etc/shorewall/rules:</para> <para>In /etc/shorewall/rules:</para>
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S) <programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
ACCEPT loc loc tcp www</programlisting> ACCEPT loc loc tcp www</programlisting>
<orderedlist numeration="loweralpha" >
<orderedlist numeration="loweralpha">
<listitem> <listitem>
<para>Alternatively, you can have the following policy in place <para>Alternatively, you can have the following policy in place
of the above rule.</para> of the above rule.</para>
<para>
<filename>/etc/shorewall/policy</filename> <para><filename>/etc/shorewall/policy</filename></para>
</para>
<programlisting>#SOURCE DESTINATION POLICY <programlisting>#SOURCE DESTINATION POLICY
loc loc ACCEPT</programlisting> loc loc ACCEPT</programlisting>
</listitem> </listitem>
</orderedlist> </orderedlist>
</listitem> </listitem>
<listitem> <listitem>
<para>On 192.168.1.3, arrange for the following command to be <para>On 192.168.1.3, arrange for the following command to be
executed after networking has come up</para> executed after networking has come up</para>
<programlisting>
<command>iptables -t nat -A PREROUTING -i eth0 -d ! 192.168.1.3 -p tcp --dport 80 -j REDIRECT --to-ports 3128</command> <programlisting><command>iptables -t nat -A PREROUTING -i eth0 -d ! 192.168.1.3 -p tcp --dport 80 -j REDIRECT --to-ports 3128</command> </programlisting>
</programlisting>
<para>If you are running RedHat on the server, you can simply <para>If you are running RedHat on the server, you can simply
execute the following commands after you have typed the iptables execute the following commands after you have typed the iptables
command above:</para> command above:</para>
<programlisting>
<command>iptables-save > /etc/sysconfig/iptables <programlisting><command>iptables-save &gt; /etc/sysconfig/iptables
chkconfig --level 35 iptables on</command> chkconfig --level 35 iptables on</command> </programlisting>
</programlisting>
</listitem> </listitem>
</orderedlist> </orderedlist>
</section> </section>
<section id="DMZ" >
<section id="DMZ">
<title>Squid (transparent) Running in the DMZ</title> <title>Squid (transparent) Running in the DMZ</title>
<para>You have a single Linux system in your DMZ with IP address <para>You have a single Linux system in your DMZ with IP address
192.0.2.177. You want to run both a web server and Squid on that system. 192.0.2.177. You want to run both a web server and Squid on that system.
Your DMZ interface is eth1 and your local interface is eth2.</para> Your DMZ interface is eth1 and your local interface is eth2.</para>
<para>If you are running a Shorewall version earlier than 2.3.2 OR your <para>If you are running a Shorewall version earlier than 2.3.2 OR your
kernel and/or iptables do not have <ulink url="Shorewall_and_Routing.html#RouteTarget" >ROUTE target kernel and/or iptables do not have <ulink
url="Shorewall_and_Routing.html#RouteTarget">ROUTE target
support</ulink> then:</para> support</ulink> then:</para>
<orderedlist> <orderedlist>
<listitem> <listitem>
<para>On your firewall system, issue the following command</para> <para>On your firewall system, issue the following command</para>
<programlisting>
<command>echo 202 www.out >> /etc/iproute2/rt_tables</command> <programlisting><command>echo 202 www.out &gt;&gt; /etc/iproute2/rt_tables</command> </programlisting>
</programlisting>
</listitem> </listitem>
<listitem> <listitem>
<para>Create <filename>/etc/shorewall/addroutes</filename> as <para>Create <filename>/etc/shorewall/addroutes</filename> as
follows:</para> follows:</para>
<programlisting>
<command>#!/bin/sh
if [ -z &quot;`ip rule list | grep www.out`&quot; ] ; then <programlisting><command>#!/bin/sh
if [ -z "`ip rule list | grep www.out`" ] ; then
ip rule add fwmark 0xCA table www.out # Note 0xCA = 202 ip rule add fwmark 0xCA table www.out # Note 0xCA = 202
ip route add default via 192.168.1.3 dev eth1 table www.out ip route add default via 192.168.1.3 dev eth1 table www.out
ip route flush cache ip route flush cache
echo 0 > /proc/sys/net/ipv4/conf/eth1/send_redirects echo 0 &gt; /proc/sys/net/ipv4/conf/eth1/send_redirects
fi</command> fi</command>
</programlisting> </programlisting>
</listitem> </listitem>
<listitem> <listitem>
<para>Make <filename>/etc/shorewall/addroutes</filename> executable <para>Make <filename>/etc/shorewall/addroutes</filename> executable
via:</para> via:</para>
<programlisting>
<command>chmod +x /etc/shorewall/addroutes</command> <programlisting><command>chmod +x /etc/shorewall/addroutes</command> </programlisting>
</programlisting>
</listitem> </listitem>
<listitem> <listitem>
<para>In <filename>/etc/shorewall/init</filename>, put:</para> <para>In <filename>/etc/shorewall/init</filename>, put:</para>
<programlisting>
<command>run_and_save_command &quot;/etc/shorewall/addroutes&quot;</command> <programlisting><command>run_and_save_command "/etc/shorewall/addroutes"</command> </programlisting>
</programlisting>
</listitem> </listitem>
</orderedlist> </orderedlist>
<para>If you are running Shorewall 2.3.2 or later:</para> <para>If you are running Shorewall 2.3.2 or later:</para>
<orderedlist> <orderedlist>
<listitem> <listitem>
<para>Add this entry in <para>Add this entry in
<filename>/etc/shorewall/providers</filename>:</para> <filename>/etc/shorewall/providers</filename>:</para>
</listitem> </listitem>
</orderedlist> </orderedlist>
<blockquote> <blockquote>
<programlisting>#NAME NUMBER MARK DUPLICATE INTERFACE GATEWAY OPTIONS <programlisting>#NAME NUMBER MARK DUPLICATE INTERFACE GATEWAY OPTIONS
Squid 1 202 - eth1 192.0.2.177 - Squid 1 202 - eth1 192.0.2.177 -
</programlisting> </programlisting>
</blockquote> </blockquote>
<para>Regardless of your Shorewall version, you need the <para>Regardless of your Shorewall version, you need the
following:</para> following:</para>
<orderedlist> <orderedlist>
<listitem> <listitem>
<para>Do <emphasis role="bold" >one</emphasis> of the <para>Do <emphasis role="bold">one</emphasis> of the
following:</para> following:</para>
<orderedlist numeration="loweralpha" >
<orderedlist numeration="loweralpha">
<listitem> <listitem>
<para>In <filename>/etc/shorewall/start</filename> add</para> <para>In <filename>/etc/shorewall/start</filename> add</para>
<programlisting>
<command>iptables -t mangle -A PREROUTING -i eth2 -p tcp --dport 80 -j MARK --set-mark 202</command> <programlisting><command>iptables -t mangle -A PREROUTING -i eth2 -p tcp --dport 80 -j MARK --set-mark 202</command> </programlisting>
</programlisting>
</listitem> </listitem>
<listitem> <listitem>
<para>Set MARK_IN_FORWARD_CHAIN=No in <para>Set MARK_IN_FORWARD_CHAIN=No in
<filename>/etc/shorewall/shorewall.conf</filename> and add the <filename>/etc/shorewall/shorewall.conf</filename> and add the
following entry in following entry in
<filename>/etc/shorewall/tcrules</filename>:</para> <filename>/etc/shorewall/tcrules</filename>:</para>
<programlisting>#MARK SOURCE DESTINATION PROTOCOL PORT <programlisting>#MARK SOURCE DESTINATION PROTOCOL PORT
202 eth2 0.0.0.0/0 tcp 80</programlisting> 202 eth2 0.0.0.0/0 tcp 80</programlisting>
</listitem> </listitem>
<listitem> <listitem>
<para>Add the following entry in <para>Add the following entry in
<filename>/etc/shorewall/tcrules</filename>:</para> <filename>/etc/shorewall/tcrules</filename>:</para>
<programlisting>#MARK SOURCE DESTINATION PROTOCOL PORT <programlisting>#MARK SOURCE DESTINATION PROTOCOL PORT
202:P eth2 0.0.0.0/0 tcp 80</programlisting> 202:P eth2 0.0.0.0/0 tcp 80</programlisting>
</listitem> </listitem>
</orderedlist> </orderedlist>
</listitem> </listitem>
<listitem> <listitem>
<para>In <filename>/etc/shorewall/rules</filename>, you will <para>In <filename>/etc/shorewall/rules</filename>, you will
need:</para> need:</para>
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S) <programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
ACCEPT loc dmz tcp 80 ACCEPT loc dmz tcp 80
ACCEPT dmz net tcp 80</programlisting> ACCEPT dmz net tcp 80</programlisting>
</listitem> </listitem>
<listitem> <listitem>
<para>On 192.0.2.177 (your Web/Squid server), arrange for the <para>On 192.0.2.177 (your Web/Squid server), arrange for the
following command to be executed after networking has come up</para> following command to be executed after networking has come up</para>
<programlisting>
<command>iptables -t nat -A PREROUTING -i eth0 -d ! 192.0.2.177 -p tcp --dport 80 -j REDIRECT --to-ports 3128</command> <programlisting><command>iptables -t nat -A PREROUTING -i eth0 -d ! 192.0.2.177 -p tcp --dport 80 -j REDIRECT --to-ports 3128</command> </programlisting>
</programlisting>
<para>If you are running RedHat/Fedora on the server, you can simply <para>If you are running RedHat/Fedora on the server, you can simply
execute the following commands after you have typed the iptables execute the following commands after you have typed the iptables
command above:</para> command above:</para>
<programlisting>
<command>iptables-save > /etc/sysconfig/iptables <programlisting><command>iptables-save &gt; /etc/sysconfig/iptables
chkconfig --level 35 iptables on</command> chkconfig --level 35 iptables on</command> </programlisting>
</programlisting>
</listitem> </listitem>
</orderedlist> </orderedlist>
</section> </section>
</section> </section>
<section id="Manual" >
<section id="Manual">
<title>Squid as a Manual Proxy</title> <title>Squid as a Manual Proxy</title>
<para>Assume that Squid is running in zone SZ and listening on port SP; <para>Assume that Squid is running in zone SZ and listening on port SP;
all web sites that are to be accessed through Squid are in the all web sites that are to be accessed through Squid are in the
<quote>net</quote> zone. Then for each zone Z that needs access to the <quote>net</quote> zone. Then for each zone Z that needs access to the
Squid server.</para> Squid server.</para>
<para>
<filename>/etc/shorewall/rules</filename>:</para> <para><filename>/etc/shorewall/rules</filename>:</para>
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S) <programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
ACCEPT Z SZ tcp SP ACCEPT Z SZ tcp SP
ACCEPT SZ net tcp 80,443</programlisting> ACCEPT SZ net tcp 80,443</programlisting>
<example> <example>
<title>Squid on the firewall listening on port 8080 with access from the <title>Squid on the firewall listening on port 8080 with access from the
<quote>loc</quote> zone:</title> <quote>loc</quote> zone:</title>
<para>
<filename>/etc/shorewall/rules:</filename> <para><filename>/etc/shorewall/rules:</filename> <programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
ACCEPT loc fw tcp 8080 ACCEPT loc fw tcp 8080
ACCEPT fw net tcp 80,443</programlisting> ACCEPT fw net tcp 80,443</programlisting></para>
</para>
</example> </example>
</section> </section>
</article> </article>