2003-12-30 02:19:52 +01:00
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<title>Shoreline Firewall (Shorewall) 1.4</title>
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<h2>Introduction to Shorewall</h2>
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<h3>This is the Shorewall 1.4 Web Site</h3>
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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>.</li>
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</ul>
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<h3>Glossary</h3>
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<ul>
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<li><a href="http://www.netfilter.org">Netfilter</a> - the
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packet 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 kernels. Also the name of the utility program used to configure
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and control that facility. Netfilter can be used in ipchains
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compatibility mode.</li>
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<li>iptables - the utility program used to configure and
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control 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).</li>
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</ul>
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<h3>What is Shorewall?</h3>
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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 configuration
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files. Shorewall reads those configuration files and with the help of
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the iptables utility, Shorewall configures Netfilter to match your
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requirements. Shorewall can be used on a dedicated firewall system, a
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multi-function gateway/router/server or on a standalone GNU/Linux
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system. Shorewall does not use Netfilter's ipchains compatibility mode
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and can thus take advantage of Netfilter's connection state tracking
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capabilities.<br>
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<br>
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Shorewall is <span style="text-decoration: underline;">not</span> a
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daemon. Once Shorewall has configured Netfilter, it's job is complete
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although the <a href="starting_and_stopping_shorewall.htm">/sbin/shorewall
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program can be used at any time to monitor the Netfilter firewall</a>.<br>
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<h3>Getting Started with Shorewall</h3>
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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 instructions.<br>
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<h3>Looking for Information?</h3>
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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 frame
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above.
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<h3>License</h3>
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This program is free software; you can redistribute it and/or modify it
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under the terms of <a href="http://www.gnu.org/licenses/gpl.html">Version
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2 of the GNU General Public License</a> as published by the Free
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Software Foundation.<br>
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<p>This program is distributed in the hope that it will be
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useful, but 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 detail.</p>
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<p>You should have received a copy of the GNU General Public
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License 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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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.2 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, with no Front-Cover, and with no Back-Cover Texts.
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A copy of the license is included in the section entitled <a>"GNU Free
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Documentation License"</a>.
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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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<h3>Running Shorewall on Mandrake with a two-interface setup?</h3>
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If so, the documentation <b></b>on this site will not apply directly
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to your setup. If you want to use the documentation that you find here,
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you will want to consider uninstalling what you have and installing a
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setup that matches the documentation on this site. See the <a
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href="two-interface.htm">Two-interface QuickStart Guide</a> for
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details.<br>
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<h2>News</h2>
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2004-01-13 23:33:26 +01:00
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<p><b>1/13/2004 - Shorewall 1.4.9 </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><b>
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</b></p>
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<p>Problems Corrected since version 1.4.8:</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 confusion,
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all instances of "Static NAT" have been replaced with "One-to-one NAT"
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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 no longer produce an error if they attempt to add a rule that
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would 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, there were cases where the SNAT specification was
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effectively ignored.<br>
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</li>
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</ol>
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<p>Migration Issues:</p>
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<p> None.<br>
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<br>
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New Features: </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 documentation is now released as separate HTML and XML
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packages.<br>
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</li>
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<li>To cut down on the number of "Why are these ports closed
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rather than stealthed?" questions, the SMB-related rules in
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/etc/shorewall/common.def have been changed from 'reject' to 'DROP'.</li>
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<li>For easier identification, packets logged under the
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'norfc1918' interface option are now logged out of chains named
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'rfc1918'. 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 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 has
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been added to shorewall.conf. MODULE_SUFFIX may be set to the suffix
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for module names in your particular distribution. If MODULE_SUFFIX is
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not set in shorewall.conf, Shorewall will use the 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). Set
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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 <action>,
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copy this file to /etc/shorewall/action.<action> and add the
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appropriate rules for that <action>. Once an <action> has
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been defined, it may be used like any of the builtin ACTIONS (ACCEPT,
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DROP, etc.) 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 and
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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<br>
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</li>
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<li>The default value for NEWNOTSYN in shorewall.conf is now
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"Yes" (non-syn TCP packets that are not part of an existing connection
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are filtered according to the rules and policies rather than being
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dropped). I have 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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<li>The common.def file now contains an entry that silently
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drops ICMP packets with a null source address. Ad Koster reported a
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case where these were occuring frequently as a result of a broken
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system on his external network.<br>
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2003-12-30 02:19:52 +01:00
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<br>
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</li>
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</ol>
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<p><b>12/28/2003 - www.shorewall.net/ftp.shorewall.net Back
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On-line</b> <b><img alt="(New)" src="images/new10.gif"
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style="border: 0px solid ; width: 28px; height: 12px;" title=""> <br>
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</b></p>
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<p>Our high-capacity server has been restored to service --
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please let <a href="mailto:webmaster@shorewall.net">us</a> know if you
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find any problems.</p>
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<p><b>12/03/2003 - Support Torch Passed</b></p>
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Effective today, I am reducing my participation in the day-to-day
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support of Shorewall. As part of this shift to community-based
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Shorewall support a new <a
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href="https://lists.shorewall.net/mailman/listinfo/shorewall-newbies">Shorewall
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Newbies mailing list</a> has been established to field questions and
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problems from new users. I will not monitor that list personally. I
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will continue my active development of Shorewall and will be available
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via the development list to handle development issues -- Tom.
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<p><a href="News.htm">More News</a></p>
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<p><a href="http://leaf.sourceforge.net" target="_top"><img
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2004-01-07 22:59:17 +01:00
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alt="(Leaf Logo)"
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style="border: 0px solid ; height: 36px; width: 49px;"
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src="images/leaflogo.gif" title=""></a> Jacques Nilo and Eric Wolzak
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have a LEAF
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2003-12-30 02:19:52 +01:00
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(router/firewall/gateway on a floppy, CD or compact flash) distribution
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called <i>Bering</i> that features Shorewall-1.4.2 and Kernel-2.4.20.
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You can find their work at: <a
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href="http://leaf.sourceforge.net/devel/jnilo">http://leaf.sourceforge.net/devel/jnilo<br>
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</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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2003-12-30 02:19:52 +01:00
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<div>
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<div style="text-align: center;"> </div>
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</div>
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<h2><a name="Donations"></a>Donations</h2>
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<p style="text-align: left;"><a href="http://www.starlight.org"><img
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align="left" alt="(Starlight Logo)" hspace="10" src="images/newlog.gif"
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style="border: 4px solid ; width: 57px; height: 100px;" title=""></a><br>
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<big>Shorewall is free but if you try it and find it useful,
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please consider making a donation to <a href="http://www.starlight.org">Starlight
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Children's Foundation</a>. Thanks!</big><br>
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<a href="http://www.starlight.org"></a></p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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2004-01-13 23:33:26 +01:00
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<p><font size="2">Updated 01/13/2004 - <a href="support.htm">Tom Eastep</a></font><br>
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2003-12-30 02:19:52 +01:00
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</p>
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</body>
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