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Vastly simpler instructions for Proxy in a DMZ

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git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@2650 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
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teastep 2005-09-09 01:02:00 +00:00
parent 819e9dd38f
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120
Shorewall-docs2/Shorewall_Squid_Usage.xml
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@ -278,122 +278,14 @@ loc loc ACCEPT</programlisting>
<section id="DMZ">
<title>Squid (transparent) Running in the DMZ</title>
<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.
Your DMZ interface is eth1 and your local interface is eth2.</para>
<para>You have a single system in your DMZ with IP address 192.0.2.177.
You want to run both a web server and Squid on that system.</para>
<para>If you are running a Shorewall version earlier than 2.3.2
then:</para>
<para>In <filename>/etc/shorewall/rules</filename>:</para>
<orderedlist>
<listitem>
<para>On your firewall system, issue the following command</para>
<programlisting><command>echo 202 www.out &gt;&gt; /etc/iproute2/rt_tables</command> </programlisting>
</listitem>
<listitem>
<para>Create <filename>/etc/shorewall/addroutes</filename> as
follows:</para>
<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 route add default via 192.168.1.3 dev eth1 table www.out
ip route flush cache
echo 0 &gt; /proc/sys/net/ipv4/conf/eth1/send_redirects
fi</command>
</programlisting>
</listitem>
<listitem>
<para>Make <filename>/etc/shorewall/addroutes</filename> executable
via:</para>
<programlisting><command>chmod +x /etc/shorewall/addroutes</command> </programlisting>
</listitem>
<listitem>
<para>In <filename>/etc/shorewall/init</filename>, put:</para>
<programlisting><command>run_and_save_command "/etc/shorewall/addroutes"</command> </programlisting>
</listitem>
</orderedlist>
<para>If you are running Shorewall 2.3.2 or later:</para>
<orderedlist>
<listitem>
<para>Add this entry in
<filename>/etc/shorewall/providers</filename>:</para>
</listitem>
</orderedlist>
<blockquote>
<programlisting>#NAME NUMBER MARK DUPLICATE INTERFACE GATEWAY OPTIONS
Squid 1 202 - eth1 192.0.2.177 -
</programlisting>
</blockquote>
<para>Regardless of your Shorewall version, you need the
following:</para>
<orderedlist>
<listitem>
<para>Do <emphasis role="bold">one</emphasis> of the
following:</para>
<orderedlist numeration="loweralpha">
<listitem>
<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>
</listitem>
<listitem>
<para>Set MARK_IN_FORWARD_CHAIN=No in
<filename>/etc/shorewall/shorewall.conf</filename> and add the
following entry in
<filename>/etc/shorewall/tcrules</filename>:</para>
<programlisting>#MARK SOURCE DESTINATION PROTOCOL PORT
202 eth2 0.0.0.0/0 tcp 80</programlisting>
</listitem>
<listitem>
<para>Add the following entry in
<filename>/etc/shorewall/tcrules</filename>:</para>
<programlisting>#MARK SOURCE DESTINATION PROTOCOL PORT
202:P eth2 0.0.0.0/0 tcp 80</programlisting>
</listitem>
</orderedlist>
</listitem>
<listitem>
<para>In <filename>/etc/shorewall/rules</filename>, you will
need:</para>
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S)
ACCEPT loc dmz tcp 80
ACCEPT dmz net tcp 80</programlisting>
</listitem>
<listitem>
<para>On 192.0.2.177 (your Web/Squid server), arrange for the
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>
<para>If you are running RedHat/Fedora on the server, you can simply
execute the following commands after you have typed the iptables
command above:</para>
<programlisting><command>iptables-save &gt; /etc/sysconfig/iptables
chkconfig --level 35 iptables on</command> </programlisting>
</listitem>
</orderedlist>
<programlisting>#ACTION SOURCE DEST PROTO DEST PORT(S) SOURCE ORIGINAL
# PORT(S) DEST
DNAT loc dmz:192.0.2.177:3128 tcp 80 - !192.0.2.177</programlisting>
</section>
</section>