2003-12-30 02:19:52 +01:00
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Shoreline Firewall (Shorewall) 1.4</title>
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<base target="_self">
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<body>
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<div align="center">
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<center>
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<table border="0" cellpadding="0" cellspacing="0"
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style="border-collapse: collapse;" width="100%" id="AutoNumber4">
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<tr>
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<td width="90%">
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<h2>Introduction<br>
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</h2>
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<ul>
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<li><a href="http://www.netfilter.org">Netfilter</a> - the
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packet
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filter facility built into the 2.4 and later Linux kernels.</li>
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<li>ipchains - the packet filter facility built into the 2.2
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Linux
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kernels. Also the name of the utility program used to configure and
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control that facility. Netfilter can be used in ipchains
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compatibility mode.<br>
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</li>
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<li>iptables - the utility program used to configure and
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control
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Netfilter. The term 'iptables' is often used to refer to the
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combination of iptables+Netfilter (with Netfilter not in ipchains
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compatibility mode).<br>
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</li>
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</ul>
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The Shoreline Firewall, more commonly known as "Shorewall", is
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high-level tool for configuring Netfilter. You describe your
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firewall/gateway requirements using entries in a set of
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configuration files. Shorewall reads those configuration files and
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with the help of the iptables utility, Shorewall configures
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Netfilter to match your requirements. Shorewall can be used on a
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dedicated firewall system, a multi-function gateway/router/server
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or on a standalone GNU/Linux system. Shorewall does not use
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Netfilter's ipchains compatibility mode and can thus take advantage
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2004-04-05 23:13:45 +02:00
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of Netfilter's <a
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href="http://www.cs.princeton.edu/%7Ejns/security/iptables/iptables_conntrack.html">connection
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state tracking capabilities</a>.
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2003-12-30 02:19:52 +01:00
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<p>This program is free software; you can redistribute it and/or
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modify it under the terms of <a
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href="http://www.gnu.org/licenses/gpl.html">Version 2 of the GNU
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General
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Public License</a> as published by the Free Software
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Foundation.<br>
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<br>
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.<br>
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<br>
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA</p>
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<p> 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;
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with 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 <a>"GNU
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Free Documentation License"</a>.</p>
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2004-01-13 23:33:26 +01:00
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<p>Copyright © 2001-2004 Thomas M. Eastep </p>
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2003-12-30 02:19:52 +01:00
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<h2>This is the Shorewall 1.4 Web Site</h2>
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The information on this site applies only to 1.4.x releases of
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Shorewall. For older versions:<br>
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<ul>
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<li>The 1.3 site is <a href="http://www.shorewall.net/1.3"
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target="_top">here.</a></li>
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<li>The 1.2 site is <a href="http://shorewall.net/1.2/"
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target="_top">here</a>.<br>
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</li>
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</ul>
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2004-04-05 23:13:45 +02:00
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<h2>Read about</h2>
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You can <a
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href="http://lists.shorewall.net/pipermail/shorewall-users/2004-February/011163.html">prepare
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for 2.0</a> while you are still running Shorewall 1.4.<br>
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<br>
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The <a href="http://shorewall.net/pub/shorewall/Beta">Shorewall 2.0.0
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RC2</a> is available!<br>
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<br>
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Here's the <a href="http://shorewall.net/2.0/Documentation_Index.html">Shorewall
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2.0.0 Documentation</a>.<br>
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2003-12-30 02:19:52 +01:00
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<h2>Getting Started with Shorewall</h2>
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New to Shorewall? Start by selecting the <a
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href="shorewall_quickstart_guide.htm">QuickStart Guide</a> that most
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closely match your environment and follow the step by step
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instructions.<br>
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<h2>Looking for Information?</h2>
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The <a href="Documentation_Index.html">Documentation
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Index</a> is a good place to start as is the Quick Search in the
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frame above.
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<h2>Running Shorewall on Mandrake with a two-interface setup?</h2>
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2004-04-05 23:13:45 +02:00
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If so, the documentation on this site will not apply
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2003-12-30 02:19:52 +01:00
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directly to your setup. If you want to use the documentation that
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you find here, you will want to consider uninstalling what you have
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and installing a setup that matches the documentation on this site.
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See the <a href="two-interface.htm">Two-interface QuickStart
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Guide</a> for details.
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<h2><b>News</b></h2>
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2004-04-05 23:13:45 +02:00
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<p><b>2/15/2004 - Shorewall 1.4.10c </b><b> <img alt="(New)"
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src="images/new10.gif"
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style="border: 0px solid ; width: 28px; height: 12px;" title=""></b></p>
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<p>Corrects one problem:<br>
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</p>
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Entries in /etc/shorewall/tcrules with an empty USER/GROUP column would
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cause a startup error.
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<p><b>2/12/2004 - Shorewall 1.4.10b </b><b> <img alt="(New)"
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2004-01-31 04:35:08 +01:00
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src="images/new10.gif"
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style="border: 0px solid ; width: 28px; height: 12px;" title=""></b></p>
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2004-04-05 23:13:45 +02:00
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<p>Corrects one problem:<br>
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</p>
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<ul>
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<li>In the /etc/shorewall/masq entry “<span class="quote">eth0:!10.1.1.150
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0.0.0.0/0!10.1.0.0/16 10.1.2.16</span>”, the
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“<span class="quote">!10.1.0.0/16</span>” is ignored.</li>
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</ul>
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<p><b>2/8/2004 - Shorewall 1.4.10a </b><b> <img alt="(New)"
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src="images/new10.gif"
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style="border: 0px solid ; width: 28px; height: 12px;" title=""></b></p>
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<p>Corrects two problems:<br>
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</p>
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<ul>
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<li>A problem which can cause [re]start to fail inexplicably
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while processing /etc/shorewall/masq.</li>
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<li>Interfaces using the Atheros WiFi card to use the 'maclist'
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option.<br>
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</li>
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</ul>
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<p><b>1/30/2004 - Shorewall 1.4.10</b></p>
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2004-01-31 04:35:08 +01:00
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<p>Problems Corrected since version 1.4.9</p>
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<ol>
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<li>The column descriptions in the action.template file did not
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match the column headings. That has been corrected.</li>
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<li>The presence of IPV6 addresses on devices generated error
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messages during [re]start if ADD_IP_ALIASES=Yes or ADD_SNAT_ALIASES=Yes
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are specified in /etc/shorewall/shorewall.conf. These messages have
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been eliminated.</li>
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<li value="3">The CONTINUE action in /etc/shorewall/rules now
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works
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correctly. A couple of problems involving rate limiting have been
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corrected. These bug fixes courtesy of Steven Jan Springl.</li>
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<li>Shorewall now tried to avoid sending an ICMP response to
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broadcasts and smurfs.</li>
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<li>Specifying "-" or "all" in the PROTO column of an action no
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longer causes a startup error. </li>
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</ol>
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Migragion Issues:<br>
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<br>
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None.<br>
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<br>
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New Features:<br>
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<ol>
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<li>The INTERFACE column in the /etc/shorewall/masq file may
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now specify a destination list. <br>
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<br>
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Example:<br>
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<br>
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#INTERFACE
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SUBNET ADDRESS<br>
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eth0:192.0.2.3,192.0.2.16/28 eth1<br>
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<br>
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If the list begins with "!" then SNAT will occur only if the
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destination IP address is NOT included in the list.<br>
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<br>
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</li>
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<li>Output traffic control rules (those with the firewall as
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the
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source) may now be qualified by the effective userid and/or effective
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group id of the program generating the output. This feature is courtesy
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of Frédéric LESPEZ.<br>
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<br>
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A new USER column has been added to /etc/shorewall/tcrules. It may
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contain :<br>
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<br>
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[<user name or number>]:[<group
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name or number>]<br>
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<br>
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2004-04-05 23:13:45 +02:00
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The colon is optional when specifying only a user.<br>
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2004-01-31 04:35:08 +01:00
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<br>
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Examples : john: / john / :users /
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john:users<br>
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<br>
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</li>
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<li>A "detectnets" interface option has been added for entries
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in
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/etc/shorewall/interfaces. This option automatically taylors the
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definition of the zone named in the ZONE column to include just
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those
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hosts that have routes through the interface named in the INTERFACE
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column. The named interface must be UP when Shorewall is [re]started.<br>
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<br>
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WARNING: DO NOT SET THIS OPTION ON YOUR INTERNET INTERFACE!
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</li>
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</ol>
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2004-04-05 23:13:45 +02:00
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<p><b>1/17/2004 - FAQ Wiki Available </b></p>
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2004-01-31 04:35:08 +01:00
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It has been asserted that the use of CVS for maintaining the
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Shorewall documentation has been a barrier to community participation.
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To test this theory, Alex Martin <a
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href="http://wiki.rettc.com/wiki.phtml?title=Wiki_Shorewall_FAQ">has
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created a Wiki</a> and with the help of Mike Noyes has populated the
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Wiki with the Shorewall FAQ.
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<p><b>1/13/2004 - Shorewall 1.4.9</b> <b><br>
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2003-12-30 02:19:52 +01:00
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</b></p>
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<p>Problems Corrected since version 1.4.8:<br>
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</p>
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<ol>
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<li>There has been a low continuing level of confusion over the
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terms "Source NAT" (SNAT) and "Static NAT". To avoid future
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confusion, all instances of "Static NAT" have been replaced with
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"One-to-one NAT" in the documentation and configuration files.</li>
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<li>The description of NEWNOTSYN in shorewall.conf has been
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reworded for clarity.</li>
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<li>Wild-card rules (those involving "all" as SOURCE or DEST)
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will
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no longer produce an error if they attempt to add a rule that would
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override a NONE policy. The logic for expanding these wild-card
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rules now simply skips those (SOURCE,DEST) pairs that have a NONE
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policy.</li>
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<li>DNAT rules that also specified SNAT now work reliably.
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Previously,
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there were cases where the SNAT specification was effectively ignored.</li>
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</ol>
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<p>Migration Issues:<br>
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<br>
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None.<br>
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<br>
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New Features:<br>
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</p>
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<ol>
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<li>The documentation has been completely rebased to Docbook
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XML. The
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documentation is now released as separate HTML and XML packages.</li>
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<li>To cut down on the number of "Why are these ports closed
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rather
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than stealthed?" questions, the SMB-related rules in
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/etc/shorewall/common.def have been changed from 'reject' to
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'DROP'.</li>
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<li>For easier identification, packets logged under the
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'norfc1918'
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interface option are now logged out of chains named 'rfc1918'.
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Previously, such packets were logged under chains named
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'logdrop'.</li>
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<li>Distributors and developers seem to be regularly inventing
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new
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naming conventions for kernel modules. To avoid the need to change
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Shorewall code for each new convention, the MODULE_SUFFIX option
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has been added to shorewall.conf. MODULE_SUFFIX may be set to the
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suffix for module names in your particular distribution. If
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MODULE_SUFFIX is not set in shorewall.conf, Shorewall will use the
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list "o gz ko o.gz".<br>
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<br>
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To see what suffix is used by your distribution:<br>
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<br>
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ls /lib/modules/$(uname -r)/kernel/net/ipv4/netfilter<br>
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<br>
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All of the files listed should have the same suffix (extension).
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Set MODULE_SUFFIX to that suffix.<br>
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<br>
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Examples:<br>
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<br>
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If all files end in ".kzo" then set
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MODULE_SUFFIX="kzo"<br>
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If all files end in ".kz.o" then set
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MODULE_SUFFIX="kz.o"</li>
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<li>Support for user defined rule ACTIONS has been implemented
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through two new files:<br>
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<br>
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/etc/shorewall/actions - used to list the user-defined ACTIONS.<br>
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/etc/shorewall/action.template - For each user defined
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<action>, copy this file to
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/etc/shorewall/action.<action> and add the appropriate rules
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for that <action>. Once an <action> has been defined,
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it may be used like any of the builtin ACTIONS (ACCEPT, DROP, etc.)
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in /etc/shorewall/rules.<br>
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<br>
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Example: You want an action that logs a packet at the 'info' level
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and accepts the connection.<br>
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<br>
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In /etc/shorewall/actions, you would add:<br>
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<br>
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LogAndAccept<br>
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<br>
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You would then copy /etc/shorewall/action.template to
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2004-01-13 23:33:26 +01:00
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/etc/shorewall/action.LogAndAccept and in that file, you would add the
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two
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2003-12-30 02:19:52 +01:00
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rules:<br>
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LOG:info<br>
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ACCEPT</li>
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<li>The default value for NEWNOTSYN in shorewall.conf is now
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"Yes" (non-syn
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TCP packets that are not part of an existing connection are filtered
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according to the rules and policies rather than being dropped). I have
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made this change for two reasons:<br>
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<br>
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a) NEWNOTSYN=No tends to result in lots of "stuck" connections since
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any timeout during TCP session tear down results in the firewall
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dropping all of the retries.<br>
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<br>
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b) The old default of NEWNOTSYN=No and LOGNEWNOTSYN=info resulted in
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lots of confusing messages when a connection got "stuck". While I could
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have changed the default value of LOGNEWNOTSYN to suppress logging, I
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dislike defaults that silently throw away packets.</li>
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2004-01-13 23:33:26 +01:00
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<li>The common.def file now contains an entry that silently
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drops ICMP
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packets with a null source address. Ad Koster reported a case where
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these were occuring frequently as a result of a broken system on his
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external network.</li>
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2003-12-30 02:19:52 +01:00
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</ol>
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<p><b><a href="News.htm">More News</a></b></p>
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<p><a href="http://leaf.sourceforge.net" target="_top"><img
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border="0" src="images/leaflogo.gif" width="49" height="36"
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alt="(Leaf Logo)"></a> Jacques Nilo and Eric Wolzak have a LEAF
|
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(router/firewall/gateway on a floppy, CD or compact flash)
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distribution called <i>Bering</i> that features Shorewall-1.4.2 and
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Kernel-2.4.20. You can find their work at: <a
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href="http://leaf.sourceforge.net/devel/jnilo">http://leaf.sourceforge.net/devel/jnilo</a></p>
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<b>Congratulations to Jacques and Eric on the recent release of
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Bering 1.2!!!</b> <br>
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<h1 align="center"><b><a href="http://www.sf.net"><img
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align="left" alt="SourceForge Logo"
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|
src="http://sourceforge.net/sflogo.php?group_id=22587&type=3"></a></b></h1>
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<h2><b>This site is hosted by the generous folks at <a
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href="http://www.sf.net">SourceForge.net</a></b></h2>
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<br>
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<br>
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<h2><b><a name="Donations"></a>Donations</b></h2>
|
2004-04-05 23:13:45 +02:00
|
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<big><img
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|
src="file:///vfat/Ursa/Shorewall/Shorewall-Website/images/alz_logo2.gif"
|
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|
title="" alt="(Alzheimer's Association Logo)"
|
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|
|
style="height: 60px; width: 300px;" align="left"></big><big>Shorewall
|
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is free but
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if you try it and find it useful,
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|
please consider making a donation to the <a href="http://www.alz.org/"
|
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|
|
target="_top">Alzheimer's Association</a>. Thanks!</big><br>
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<br>
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</td>
|
2003-12-30 02:19:52 +01:00
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</tr>
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</tbody>
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</table>
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</center>
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</div>
|
2004-04-05 23:13:45 +02:00
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<p><font size="2">Updated 03/08/2004 - <a href="support.htm">Tom
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2003-12-30 02:19:52 +01:00
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Eastep</a></font><br>
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</p>
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</body>
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</html>
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