forked from extern/shorewall_code
d6f9f805f1
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@1851 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
1495 lines
37 KiB
XML
1495 lines
37 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 id="PPTP">
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<!--$Id$-->
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<articleinfo>
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<title>PPTP</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>2004-12-23</pubdate>
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<copyright>
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<year>2001</year>
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<year>2002</year>
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<year>2003</year>
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<year>2004</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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<revhistory>
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<revision>
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<revnumber>1.4</revnumber>
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<date>2004-11-02</date>
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<authorinitials>TE</authorinitials>
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<revremark>Added link to Greg Kops's tutorial.</revremark>
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</revision>
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<revision>
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<revnumber>1.3</revnumber>
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<date>2004-05-22</date>
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<authorinitials>TE</authorinitials>
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<revremark>Warning about PPTP conntrack patch and GRE
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tunnels.</revremark>
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</revision>
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<revision>
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<revnumber>1.2</revnumber>
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<date>2004-04-15</date>
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<authorinitials>TE</authorinitials>
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<revremark>Revised instructions regarding PPTP conntrack
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patch.</revremark>
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</revision>
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<revision>
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<revnumber>1.1</revnumber>
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<date>2003-12-23</date>
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<authorinitials>TE</authorinitials>
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<revremark>Added note about PPTP module support in Bering
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1.2</revremark>
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</revision>
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</revhistory>
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<abstract>
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<para>Shorewall easily supports PPTP in a number of
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configurations.</para>
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</abstract>
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</articleinfo>
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<section>
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<title>Overview</title>
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<note>
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<para>I am no longer attempting to maintain MPPE patches for current
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Linux kernel's and pppd. I recommend that you refer to the following
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URLs for information about installing MPPE into your kernel and
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pppd.</para>
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</note>
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<para>The <ulink url="http://pptpclient.sourceforge.net">Linux PPTP client
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project</ulink> has a nice GUI for configuring and managing VPN
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connections where your Linux system is the PPTP client. This is what I
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currently use. I am no longer running PoPToP but rather I use the PPTP
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Server included with XP Professional (see <ulink
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url="PPTP.htm#ServerBehind">PPTP Server running behind your
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Firewall</ulink> below).</para>
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<variablelist>
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<varlistentry>
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<term><ulink
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url="http://pptpclient.sourceforge.net">http://pptpclient.sourceforge.net</ulink></term>
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<listitem>
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<para>Everything you need to run a PPTP client.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><ulink
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url="http://www.poptop.org">http://www.poptop.org</ulink></term>
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<listitem>
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<para>The <quote>kernelmod</quote> package can be used to quickly
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install MPPE into your kernel without rebooting.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><ulink
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url="http://devel.elucid8design.com/el8/devel/tutorials/pptp.php">http://devel.elucid8design.com/el8/devel/tutorials/pptp.php</ulink></term>
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<listitem>
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<para>A nice tutorial for installing a PPTP server on Fedora.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>I am leaving the instructions for building MPPE-enabled kernels and
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pppd in the text below for those who may wish to obtain the relevant
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current patches and <quote>roll their own</quote>.</para>
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</section>
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<section>
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<title>Preliminary Reading</title>
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<para>I recommend reading the <ulink url="VPNBasics.html">VPN
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Basics</ulink> article if you plan to implement any type of VPN.</para>
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</section>
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<section id="ServerFW">
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<title>PPTP Server Running on your Firewall</title>
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<para>I will try to give you an idea of how to set up a PPTP server on
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your firewall system. This isn't a detailed HOWTO but rather an example of
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how I have set up a working PPTP server on my own firewall.</para>
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<para>The steps involved are:</para>
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<orderedlist>
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<listitem>
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<para><xref linkend="PatchPppd" /></para>
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</listitem>
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<listitem>
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<para><xref linkend="PatchKernel" /></para>
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</listitem>
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<listitem>
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<para><xref linkend="Samba" /></para>
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</listitem>
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<listitem>
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<para><xref linkend="ConfigPppd" /></para>
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</listitem>
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<listitem>
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<para><xref linkend="ConfigPptpd" /></para>
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</listitem>
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<listitem>
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<para><xref linkend="ConfigFw" /></para>
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</listitem>
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</orderedlist>
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<section id="PatchPppd">
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<title>Patching and building pppd</title>
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<para>To run pppd on a 2.4 kernel, you need the pppd 2.4.1 or later. The
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primary site for releases of pppd is <ulink
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url="ftp://ftp.samba.org/pub/ppp">ftp://ftp.samba.org/pub/ppp</ulink>.</para>
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<para>You will need the following patches:</para>
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<simplelist>
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<member><ulink
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url="http://www.shorewall.net/pub/shorewall/pptp/ppp-2.4.1-openssl-0.9.6-mppe-patch.gz">http://www.shorewall.net/pub/shorewall/pptp/ppp-2.4.1-openssl-0.9.6-mppe-patch.gz</ulink></member>
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<member><ulink
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url="http://www.shorewall.net/pub/shorewall/pptp/ppp-2.4.1-MSCHAPv2-fix.patch.gz">http://www.shorewall.net/pub/shorewall/pptp/ppp-2.4.1-MSCHAPv2-fix.patch.gz</ulink></member>
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</simplelist>
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<para>You may also want the following patch if you want to require
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remote hosts to use encryption:</para>
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<simplelist>
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<member><ulink
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url="ftp://ftp.shorewall.net/pub/shorewall/pptp/require-mppe.diff">ftp://ftp.shorewall.net/pub/shorewall/pptp/require-mppe.diff</ulink></member>
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</simplelist>
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<para>Un-tar the pppd source and uncompress the patches into one
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directory (the patches and the ppp-2.4.1 directory are all in a single
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parent directory):</para>
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<programlisting>cd ppp-2.4.1
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patch -p1 < ../ppp-2.4.0-openssl-0.9.6-mppe.patch
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patch -p1 < ../ppp-2.4.1-MSCHAPv2-fix.patch
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(Optional) patch -p1 < ../require-mppe.diff
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./configure
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make</programlisting>
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<para>You will need to install the resulting binary on your firewall
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system. To do that, I NFS mount my source filesystem and use <quote>make
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install</quote> from the ppp-2.4.1 directory.</para>
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</section>
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<section id="PatchKernel">
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<title>Patching and building your Kernel</title>
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<para>You will need one of the following patches depending on your
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kernel version:</para>
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<simplelist>
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<member>http://www.shorewall.net/pub/shorewall/pptp/linux-2.4.4-openssl-0.9.6a-mppe-patch.gz</member>
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<member>http://www.shorewall/net/pub/shorewall/pptp/linux-2.4.16-openssl-0.9.6b-mppe-patch.gz</member>
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</simplelist>
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<para>Uncompress the patch into the same directory where your top-level
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kernel source is located and:</para>
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<programlisting>cd <your GNU/Linux source top-level directory>
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patch -p1 < ../linux-2.4.16-openssl-0.9.6b-mppe.patch</programlisting>
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<para>Now configure your kernel. Here is my ppp configuration:</para>
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<graphic fileref="images/ppp.jpg" />
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</section>
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<section id="Samba">
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<title>Configuring Samba</title>
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<para>You will need a WINS server (Samba configured to run as a WINS
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server is fine). Global section from /etc/samba/smb.conf on my WINS
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server (192.168.1.3) is:</para>
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<programlisting>[global]
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workgroup = TDM-NSTOP
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netbios name = WOOKIE
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server string = GNU/Linux Box
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encrypt passwords = Yes
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log file = /var/log/samba/%m.log
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max log size = 0
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socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
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os level = 65
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domain master = True
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preferred master = True
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dns proxy = No
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wins support = Yes
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printing = lprng
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[homes]
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comment = Home Directories
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valid users = %S
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read only = No
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create mask = 0664
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directory mask = 0775
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[printers]
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comment = All Printers
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path = /var/spool/samba
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printable = Yes</programlisting>
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</section>
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<section id="ConfigPppd">
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<title>Configuring pppd</title>
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<para>Here is a copy of my /etc/ppp/options.poptop file:</para>
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<programlisting>ipparam PoPToP
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lock
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mtu 1490
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mru 1490
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ms-wins 192.168.1.3
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ms-dns 206.124.146.177
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multilink
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proxyarp
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auth
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+chap
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+chapms
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+chapms-v2
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ipcp-accept-local
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ipcp-accept-remote
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lcp-echo-failure 30
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lcp-echo-interval 5
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deflate 0
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mppe-128
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mppe-stateless
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require-mppe
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require-mppe-stateless</programlisting>
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<note>
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<itemizedlist>
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<listitem>
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<para>System 192.168.1.3 acts as a WINS server so I have included
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that IP as the <quote>ms-wins</quote> value.</para>
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</listitem>
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<listitem>
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<para>I have pointed the remote clients at my DNS server -- it has
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external address 206.124.146.177.</para>
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</listitem>
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<listitem>
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<para>I am requiring 128-bit stateless compression (my kernel is
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built with the <quote>require-mppe.diff</quote> patch mentioned
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above.</para>
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</listitem>
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</itemizedlist>
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</note>
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<para>Here's my /etc/ppp/chap-secrets:</para>
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<programlisting>Secrets for authentication using CHAP
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# client server secret IP addresses
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CPQTDM\\TEastep * <shhhhhh> 192.168.1.7
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TEastep * <shhhhhh> 192.168.1.7</programlisting>
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<para>I am the only user who connects to the server but I may connect
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either with or without a domain being specified. The system I connect
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from is my laptop so I give it the same IP address when tunneled in at
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it has when I use its wireless LAN card around the house.</para>
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<para>You will also want the following in /etc/modules.conf:</para>
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<programlisting>alias ppp-compress-18 ppp_mppe
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alias ppp-compress-21 bsd_comp
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alias ppp-compress-24 ppp_deflate
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alias ppp-compress-26 ppp_deflate</programlisting>
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</section>
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<section id="ConfigPptpd">
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<title>Configuring pptpd</title>
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<para>PoPTop (pptpd) is available from <ulink
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url="http://poptop.lineo.com/">http://poptop.lineo.com/</ulink>.</para>
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<para>Here is a copy of my /etc/pptpd.conf file:</para>
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<programlisting>option /etc/ppp/options.poptop
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speed 115200
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localip 192.168.1.254
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remoteip 192.168.1.33-38</programlisting>
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<note>
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<itemizedlist>
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<listitem>
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<para>I specify the /etc/ppp/options.poptop file as my ppp options
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file (I have several).</para>
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</listitem>
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<listitem>
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<para>The local IP is the same as my internal interface's
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(192.168.1.254).</para>
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</listitem>
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<listitem>
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<para>I have assigned a remote IP range that overlaps my local
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network. This, together with <quote>proxyarp</quote> in my
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/etc/ppp/options.poptop file make the remote hosts look like they
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are part of the local subnetwork.</para>
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</listitem>
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</itemizedlist>
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</note>
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<para>I use this file to start/stop pptpd -- I have this in
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/etc/init.d/pptpd:</para>
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<programlisting>#!/bin/sh
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#
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# /etc/rc.d/init.d/pptpd
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#
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# chkconfig: 5 12 85
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# description: control pptp server
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#
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case "$1" in
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start)
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echo 1 > /proc/sys/net/ipv4/ip_forward
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modprobe ppp_async
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modprobe ppp_generic
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modprobe ppp_mppe
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modprobe slhc
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if /usr/local/sbin/pptpd; then
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touch /var/lock/subsys/pptpd
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fi
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;;
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stop)
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killall pptpd
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rm -f /var/lock/subsys/pptpd
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;;
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restart)
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killall pptpd
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if /usr/local/sbin/pptpd; then
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touch /var/lock/subsys/pptpd
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fi
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;;
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status)
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ifconfig
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;;
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*)
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echo "Usage: $0 {start|stop|restart|status}"
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;;
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esac</programlisting>
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</section>
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<section id="ConfigFw">
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<title>Configuring Shorewall</title>
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<section>
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<title>Basic Setup</title>
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<para>Here' a basic setup that treats your remote users as if they
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were part of your <emphasis role="bold">loc</emphasis> zone. Note that
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if your primary internet connection uses ppp0, then be sure that
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<emphasis role="bold">loc</emphasis> follows <emphasis
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role="bold">net</emphasis> in /etc/shorewall/zones.</para>
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<table>
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<title>/etc/shorewall/tunnels</title>
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<tgroup cols="4">
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<thead>
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<row>
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<entry align="center">TYPE</entry>
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<entry align="center">ZONE</entry>
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<entry align="center">GATEWAY</entry>
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<entry align="center">GATEWAY ZONE</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>pptpserver</entry>
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<entry>net</entry>
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<entry>0.0.0.0/0</entry>
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<entry></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<table>
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<title>/etc/shorewall/interfaces</title>
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<tgroup cols="4">
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<thead>
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<row>
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<entry align="center">ZONE</entry>
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<entry align="center">INTERFACE</entry>
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<entry align="center">BROADCAST</entry>
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<entry align="center">OPTIONS</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>loc</entry>
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<entry>ppp+</entry>
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<entry>-</entry>
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<entry></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</section>
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|
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<section>
|
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<title>Remote Users in a Separate Zone</title>
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|
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<para>If you want to place your remote users in their own zone so that
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you can control connections between these users and the local network,
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follow this example. Note that if your primary internet connection
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uses ppp0 then be sure that <emphasis role="bold">vpn</emphasis>
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follows <emphasis role="bold">net</emphasis> in /etc/shorewall/zones
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as shown below.</para>
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|
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<table>
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<title>/etc/shorewall/tunnels</title>
|
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<tgroup cols="4">
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<thead>
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<row>
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<entry align="center">TYPE</entry>
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<entry align="center">ZONE</entry>
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<entry align="center">GATEWAY</entry>
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<entry align="center">GATEWAY ZONE</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>pptpserver</entry>
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<entry>net</entry>
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<entry>0.0.0.0/0</entry>
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|
|
<entry></entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/zones</title>
|
|
|
|
<tgroup cols="3">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">ZONE</entry>
|
|
|
|
<entry align="center">DISPLAY</entry>
|
|
|
|
<entry align="center">COMMENTS</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>net</entry>
|
|
|
|
<entry>Internet</entry>
|
|
|
|
<entry>The Internet</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>loc</entry>
|
|
|
|
<entry>Local</entry>
|
|
|
|
<entry>Local Network</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>vpn</entry>
|
|
|
|
<entry>VPN</entry>
|
|
|
|
<entry>Remote Users</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/interfaces</title>
|
|
|
|
<tgroup cols="4">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">ZONE</entry>
|
|
|
|
<entry align="center">INTERFACE</entry>
|
|
|
|
<entry align="center">BROADCAST</entry>
|
|
|
|
<entry align="center">OPTIONS</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>net</entry>
|
|
|
|
<entry>eth0</entry>
|
|
|
|
<entry>206.124.146.255</entry>
|
|
|
|
<entry>norfc1918</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>loc</entry>
|
|
|
|
<entry>eth2</entry>
|
|
|
|
<entry>192.168.10.255</entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>vpn</entry>
|
|
|
|
<entry>ppp+</entry>
|
|
|
|
<entry>-</entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<para>Your policies and rules may now be configured for traffic
|
|
to/from the <emphasis role="bold">vpn</emphasis> zone.</para>
|
|
</section>
|
|
|
|
<section>
|
|
<title>Multiple Remote Networks</title>
|
|
|
|
<para>Often there will be situations where you want multiple
|
|
connections from remote networks with these networks having different
|
|
firewalling requirements.<graphic
|
|
fileref="images/MultiPPTP.png" /></para>
|
|
|
|
<para>Here's how you configure this in Shorewall. Note that if your
|
|
primary internet connection uses ppp0 then be sure that the <emphasis
|
|
role="bold">vpn{1-3}</emphasis> zones follows <emphasis
|
|
role="bold">net</emphasis> in /etc/shorewall/zones as shown
|
|
below.</para>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/tunnels</title>
|
|
|
|
<tgroup cols="4">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">TYPE</entry>
|
|
|
|
<entry align="center">ZONE</entry>
|
|
|
|
<entry align="center">GATEWAY</entry>
|
|
|
|
<entry align="center">GATEWAY ZONE</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>pptpserver</entry>
|
|
|
|
<entry>net</entry>
|
|
|
|
<entry>0.0.0.0/0</entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/zones</title>
|
|
|
|
<tgroup cols="3">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">ZONE</entry>
|
|
|
|
<entry align="center">DISPLAY</entry>
|
|
|
|
<entry align="center">COMMENTS</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>net</entry>
|
|
|
|
<entry>Internet</entry>
|
|
|
|
<entry>The Internet</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>loc</entry>
|
|
|
|
<entry>Local</entry>
|
|
|
|
<entry>Local Network</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>vpn1</entry>
|
|
|
|
<entry>Remote1</entry>
|
|
|
|
<entry>Remote Network 1</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>vpn2</entry>
|
|
|
|
<entry>Remote2</entry>
|
|
|
|
<entry>Remote Network 2</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>vpn3</entry>
|
|
|
|
<entry>Remote3</entry>
|
|
|
|
<entry>Remote Network 3</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/interfaces</title>
|
|
|
|
<tgroup cols="4">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">ZONE</entry>
|
|
|
|
<entry align="center">INTERFACE</entry>
|
|
|
|
<entry align="center">BROADCAST</entry>
|
|
|
|
<entry align="center">OPTIONS</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>net</entry>
|
|
|
|
<entry>eth0</entry>
|
|
|
|
<entry>206.124.146.255</entry>
|
|
|
|
<entry>norfc1918</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>loc</entry>
|
|
|
|
<entry>eth2</entry>
|
|
|
|
<entry>192.168.10.255</entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>-</entry>
|
|
|
|
<entry>ppp+</entry>
|
|
|
|
<entry>-</entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/hosts</title>
|
|
|
|
<tgroup cols="3">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">ZONE</entry>
|
|
|
|
<entry align="center">HOST(S)</entry>
|
|
|
|
<entry align="center">OPTIONS</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>vpn1</entry>
|
|
|
|
<entry>ppp+:192.168.1.0/24</entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>vpn2</entry>
|
|
|
|
<entry>ppp+:192.168.2.0/24</entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>vpn3</entry>
|
|
|
|
<entry>ppp+:192.168.3.0/24</entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<para>Your policies and rules can now be configured using separate
|
|
zones (vpn1, vpn2, and vpn3) for the three remote network.</para>
|
|
</section>
|
|
</section>
|
|
</section>
|
|
|
|
<section id="ServerBehind">
|
|
<title>PPTP Server Running Behind your Firewall</title>
|
|
|
|
<para>If you have a single external IP address, add the following to your
|
|
/etc/shorewall/rules file:</para>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/rules</title>
|
|
|
|
<tgroup cols="7">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">ACTION</entry>
|
|
|
|
<entry align="center">SOURCE</entry>
|
|
|
|
<entry>DEST</entry>
|
|
|
|
<entry>PROTO</entry>
|
|
|
|
<entry>DEST PORT(S)</entry>
|
|
|
|
<entry>SOURCE PORT(S)</entry>
|
|
|
|
<entry>ORIGINAL DEST</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>DNAT</entry>
|
|
|
|
<entry>net</entry>
|
|
|
|
<entry>loc:<<emphasis>server address</emphasis>></entry>
|
|
|
|
<entry>tcp</entry>
|
|
|
|
<entry>1723</entry>
|
|
|
|
<entry></entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>DNAT</entry>
|
|
|
|
<entry>net</entry>
|
|
|
|
<entry>loc:<<emphasis>server address</emphasis>></entry>
|
|
|
|
<entry>47</entry>
|
|
|
|
<entry>-</entry>
|
|
|
|
<entry></entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<para>If you have multiple external IP address and you want to forward a
|
|
single <<emphasis>external address</emphasis>>, add the following to
|
|
your /etc/shorewall/rules file:</para>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/rules</title>
|
|
|
|
<tgroup cols="7">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">ACTION</entry>
|
|
|
|
<entry align="center">SOURCE</entry>
|
|
|
|
<entry>DEST</entry>
|
|
|
|
<entry>PROTO</entry>
|
|
|
|
<entry>DEST PORT(S)</entry>
|
|
|
|
<entry>SOURCE PORT(S)</entry>
|
|
|
|
<entry>ORIGINAL DEST</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>DNAT</entry>
|
|
|
|
<entry>net</entry>
|
|
|
|
<entry>loc:<<emphasis>server address</emphasis>></entry>
|
|
|
|
<entry>tcp</entry>
|
|
|
|
<entry>1723</entry>
|
|
|
|
<entry>-</entry>
|
|
|
|
<entry><<emphasis>external address</emphasis>></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>DNAT</entry>
|
|
|
|
<entry>net</entry>
|
|
|
|
<entry>loc:<<emphasis>server address</emphasis>></entry>
|
|
|
|
<entry>47</entry>
|
|
|
|
<entry>-</entry>
|
|
|
|
<entry>-</entry>
|
|
|
|
<entry><<emphasis>external address</emphasis>></entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
</section>
|
|
|
|
<section id="ClientsBehind">
|
|
<title>PPTP Clients Running Behind your Firewall</title>
|
|
|
|
<para>You shouldn't have to take any special action for this case unless
|
|
you wish to connect multiple clients to the same external server. In that
|
|
case, you must install the PPTP connection/tracking and NAT patch from
|
|
<ulink url="http://www.netfilter.org">Netfilter Patch-O-Mati</ulink>c
|
|
(some distributions are now shipping with this patch installed). I
|
|
recommend that you also add these four lines to your
|
|
/etc/shorewall/modules file:</para>
|
|
|
|
<programlisting>loadmodule ip_conntrack_proto_gre
|
|
loadmodule ip_conntrack_pptp
|
|
loadmodule ip_nat_pptp
|
|
loadmodule ip_nat_proto_gre</programlisting>
|
|
|
|
<para>For LEAF/Bering users, the 2.4.20 kernel as already been patched as
|
|
described at the URL above and the three modules are included in the
|
|
Bering 1.2 modules tarball.</para>
|
|
|
|
<warning>
|
|
<para>Installing the above modules will prevent any GRE tunnels that you
|
|
have from working correctly.</para>
|
|
</warning>
|
|
</section>
|
|
|
|
<section id="ClientFW">
|
|
<title>PPTP Client Running on your Firewall</title>
|
|
|
|
<para>The PPTP GNU/Linux client is available at <ulink
|
|
url="http://sourceforge.net/projects/pptpclient/">http://sourceforge.net/projects/pptpclient/</ulink>.
|
|
Rather than use the configuration script that comes with the client, I
|
|
built my own. I also build my own kernel <link linkend="PatchKernel">as
|
|
described above</link> rather than using the mppe package that is
|
|
available with the client. My /etc/ppp/options file is mostly unchanged
|
|
from what came with the client (see below).</para>
|
|
|
|
<para>The key elements of this setup are as follows:</para>
|
|
|
|
<orderedlist>
|
|
<listitem>
|
|
<para>Define a zone for the remote network accessed via PPTP.</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>Associate that zone with a ppp interface.</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>Define rules for PPTP traffic to/from the firewall.</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>Define rules for traffic two and from the remote zone.</para>
|
|
</listitem>
|
|
</orderedlist>
|
|
|
|
<para>Here are examples from my setup:</para>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/zones</title>
|
|
|
|
<tgroup cols="3">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">ZONE</entry>
|
|
|
|
<entry align="center">DISPLAY</entry>
|
|
|
|
<entry align="center">COMMENTS</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>cpq</entry>
|
|
|
|
<entry>Compaq</entry>
|
|
|
|
<entry>Compaq Intranet</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/interfaces</title>
|
|
|
|
<tgroup cols="4">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">ZONE</entry>
|
|
|
|
<entry align="center">INTERFACE</entry>
|
|
|
|
<entry align="center">BROADCAST</entry>
|
|
|
|
<entry align="center">OPTIONS</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>-</entry>
|
|
|
|
<entry>ppp+</entry>
|
|
|
|
<entry></entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/hosts</title>
|
|
|
|
<tgroup cols="3">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">ZONE</entry>
|
|
|
|
<entry align="center">HOST(S)</entry>
|
|
|
|
<entry align="center">OPTIONS</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>-</entry>
|
|
|
|
<entry>ppp+:!192.168.1.0/24</entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/rules (For Shorewall versions up to and including
|
|
1.3.9b)</title>
|
|
|
|
<tgroup cols="7">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">ACTION</entry>
|
|
|
|
<entry align="center">SOURCE</entry>
|
|
|
|
<entry align="center">DEST</entry>
|
|
|
|
<entry align="center">PROTO</entry>
|
|
|
|
<entry align="center">DEST PORT(S)</entry>
|
|
|
|
<entry align="center">SOURCE PORT(S)</entry>
|
|
|
|
<entry align="center">ORIGINAL DEST</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>ACCEPT</entry>
|
|
|
|
<entry>fw</entry>
|
|
|
|
<entry>net</entry>
|
|
|
|
<entry>tcp</entry>
|
|
|
|
<entry>1723</entry>
|
|
|
|
<entry></entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>ACCEPT</entry>
|
|
|
|
<entry>fw</entry>
|
|
|
|
<entry>net</entry>
|
|
|
|
<entry>47</entry>
|
|
|
|
<entry>-</entry>
|
|
|
|
<entry></entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/tunnels (For Shorewall versions 1.3.10 and
|
|
later)</title>
|
|
|
|
<tgroup cols="4">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">TYPE</entry>
|
|
|
|
<entry align="center">ZONE</entry>
|
|
|
|
<entry align="center">GATEWAY</entry>
|
|
|
|
<entry align="center">GATEWAY ZONE</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>pptpclient</entry>
|
|
|
|
<entry>net</entry>
|
|
|
|
<entry>0.0.0.0/0</entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<para>I use the combination of interface and hosts file to define the
|
|
<quote>cpq</quote> zone because I also run a PPTP server on my firewall
|
|
(see above). Using this technique allows me to distinguish clients of my
|
|
own PPTP server from arbitrary hosts at Compaq; I assign addresses in
|
|
192.168.1.0/24 to my PPTP clients and Compaq doesn't use that RFC1918
|
|
Class C subnet.</para>
|
|
|
|
<para>I use this script in /etc/init.d to control the client. The reason
|
|
that I disable ECN when connecting is that the Compaq tunnel servers don't
|
|
do ECN yet and reject the initial TCP connection request if I enable ECN
|
|
:-(</para>
|
|
|
|
<programlisting>#!/bin/sh
|
|
#
|
|
# /etc/rc.d/init.d/pptp
|
|
#
|
|
# chkconfig: 5 60 85
|
|
# description: PPTP Link Control
|
|
#
|
|
NAME="Tandem"
|
|
ADDRESS=tunnel-tandem.compaq.com
|
|
USER='Tandem\tommy'
|
|
ECN=0
|
|
DEBUG=
|
|
|
|
start_pptp() {
|
|
echo $ECN > /proc/sys/net/ipv4/tcp_ecn
|
|
if /usr/sbin/pptp $ADDRESS user $USER noauth $DEBUG; then
|
|
touch /var/lock/subsys/pptp
|
|
echo "PPTP Connection to $NAME Started"
|
|
fi
|
|
}
|
|
|
|
stop_pptp() {
|
|
if killall /usr/sbin/pptp 2> /dev/null; then
|
|
echo "Stopped pptp"
|
|
else
|
|
rm -f /var/run/pptp/*
|
|
fi
|
|
|
|
# if killall pppd; then
|
|
# echo "Stopped pppd"
|
|
# fi
|
|
|
|
rm -f /var/lock/subsys/pptp
|
|
|
|
echo 1 > /proc/sys/net/ipv4/tcp_ecn
|
|
}
|
|
|
|
|
|
case "$1" in
|
|
start)
|
|
echo "Starting PPTP Connection to ${NAME}..."
|
|
start_pptp
|
|
;;
|
|
stop)
|
|
echo "Stopping $NAME PPTP Connection..."
|
|
stop_pptp
|
|
;;
|
|
restart)
|
|
echo "Restarting $NAME PPTP Connection..."
|
|
stop_pptp
|
|
start_pptp
|
|
;;
|
|
status)
|
|
ifconfig
|
|
;;
|
|
*)
|
|
echo "Usage: $0 {start|stop|restart|status}"
|
|
;;
|
|
esac</programlisting>
|
|
|
|
<para>Here's my /etc/ppp/options file:</para>
|
|
|
|
<programlisting>#
|
|
# Identify this connection
|
|
#
|
|
ipparam Compaq
|
|
#
|
|
# Lock the port
|
|
#
|
|
lock
|
|
#
|
|
# We don't need the tunnel server to authenticate itself
|
|
#
|
|
noauth
|
|
|
|
+chap
|
|
+chapms
|
|
+chapms-v2
|
|
|
|
multilink
|
|
mrru 1614
|
|
#
|
|
# Turn off transmission protocols we know won't be used
|
|
#
|
|
nobsdcomp
|
|
nodeflate
|
|
|
|
#
|
|
# We want MPPE
|
|
#
|
|
mppe-128
|
|
mppe-stateless
|
|
|
|
#
|
|
# We want a sane mtu/mru
|
|
#
|
|
mtu 1000
|
|
mru 1000
|
|
|
|
#
|
|
# Time this thing out of it goes poof
|
|
#
|
|
lcp-echo-failure 10
|
|
lcp-echo-interval 10</programlisting>
|
|
|
|
<para>My /etc/ppp/ip-up.local file sets up the routes that I need to route
|
|
Compaq traffic through the PPTP tunnel:</para>
|
|
|
|
<programlisting>#/bin/sh
|
|
|
|
case $6 in
|
|
Compaq)
|
|
route add -net 16.0.0.0 netmask 255.0.0.0 gw $5 $1
|
|
route add -net 130.252.0.0 netmask 255.255.0.0 gw $5 $1
|
|
route add -net 131.124.0.0 netmask 255.255.0.0 gw $5 $1
|
|
...
|
|
;;
|
|
esac</programlisting>
|
|
|
|
<para>Finally, I run the following script every five minutes under crond
|
|
to restart the tunnel if it fails:</para>
|
|
|
|
<programlisting>#!/bin/sh
|
|
restart_pptp() {
|
|
/sbin/service pptp stop
|
|
sleep 10
|
|
if /sbin/service pptp start; then
|
|
/usr/bin/logger "PPTP Restarted"
|
|
fi
|
|
}
|
|
|
|
if [ -n "`ps ax | grep /usr/sbin/pptp | grep -v grep`" ]; then
|
|
exit 0
|
|
fi
|
|
|
|
echo "Attempting to restart PPTP"
|
|
|
|
restart_pptp > /dev/null 2>&1 &</programlisting>
|
|
|
|
<para><ulink url="ftp://ftp.shorewall.net/pub/shorewall/misc/Vonau">Here's
|
|
a scriptand corresponding ip-up.local</ulink> from Jerry Vonau
|
|
<email>jvonau@home.com</email> that controls two PPTP connections.</para>
|
|
</section>
|
|
|
|
<section id="PPTP_ADSL">
|
|
<title>PPTP Client running on your Firewall with PPTP Server in an ADSL
|
|
Modem</title>
|
|
|
|
<para>Some ADSL systems in Europe (most notably in Austria) feature a PPTP
|
|
server built into an ADSL <quote>Modem</quote>. In this setup, an ethernet
|
|
interface is dedicated to supporting the PPTP tunnel between the firewall
|
|
and the <quote>Modem</quote> while the actual internet access is through
|
|
PPTP (interface ppp0). If you have this type of setup, you need to modify
|
|
the sample configuration that you downloaded as described in this section.
|
|
<emphasis role="bold">These changes are in addition to those described in
|
|
the <ulink url="shorewall_quickstart_guide.htm">QuickStart
|
|
Guides</ulink>.</emphasis></para>
|
|
|
|
<para>Lets assume the following:</para>
|
|
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>ADSL Modem connected through eth0</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>Modem IP address = 192.168.1.1</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>eth0 IP address = 192.168.1.2</para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
|
|
<para>The changes you need to make are as follows:</para>
|
|
|
|
<orderedlist>
|
|
<listitem>
|
|
<para>Add this entry to /etc/shorewall/zones:</para>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/zones</title>
|
|
|
|
<tgroup cols="3">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">ZONE</entry>
|
|
|
|
<entry align="center">DISPLAY</entry>
|
|
|
|
<entry align="center">COMMENTS</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>modem</entry>
|
|
|
|
<entry>Modem</entry>
|
|
|
|
<entry>ADSL Modem</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<para>That entry defines a new zone called <quote>modem</quote> which
|
|
will contain only your ADSL modem.</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>Add the following entry to /etc/shorewall/interfaces:</para>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/interfaces</title>
|
|
|
|
<tgroup cols="4">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">ZONE</entry>
|
|
|
|
<entry align="center">INTERFACE</entry>
|
|
|
|
<entry align="center">BROADCAST</entry>
|
|
|
|
<entry align="center">OPTIONS</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>modem</entry>
|
|
|
|
<entry>eth0</entry>
|
|
|
|
<entry>192.168.1.255</entry>
|
|
|
|
<entry>dhcp</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<para>You will of course modify the <quote>net</quote> entry in
|
|
/etc/shorewall/interfaces to specify <quote>ppp0</quote> as the
|
|
interface as described in the QuickStart Guide corresponding to your
|
|
setup.</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>Add the following to /etc/shorewall/tunnels:</para>
|
|
|
|
<table>
|
|
<title>/etc/shorewall/tunnels</title>
|
|
|
|
<tgroup cols="4">
|
|
<thead>
|
|
<row>
|
|
<entry align="center">TYPE</entry>
|
|
|
|
<entry align="center">ZONE</entry>
|
|
|
|
<entry align="center">GATEWAY</entry>
|
|
|
|
<entry align="center">GATEWAY ZONE</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>pptpclient</entry>
|
|
|
|
<entry>modem</entry>
|
|
|
|
<entry>192.168.1.1</entry>
|
|
|
|
<entry></entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<para>That entry allows a PPTP tunnel to be established between your
|
|
Shorewall system and the PPTP server in the modem.</para>
|
|
</listitem>
|
|
</orderedlist>
|
|
</section>
|
|
</article> |