forked from extern/shorewall_code
274 lines
12 KiB
HTML
274 lines
12 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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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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</head>
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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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<tbody>
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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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of Netfilter's connection state tracking capabilities.
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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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<p>Copyright © 2001-2003 Thomas M. Eastep </p>
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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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<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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If so, the documentation <b></b>on this site will not apply
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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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<p><b>12/29/2003 - Shorewall 1.4.9 Beta 2</b> <b><img
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style="border: 0px solid ; width: 28px; height: 12px;"
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src="images/new10.gif" alt="(New)" title=""><br>
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</b></p>
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<div style="margin-left: 40px;"><a
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href="http://shorewall.net/pub/shorewall/Beta">http://shorewall.net/pub/shorewall/Beta</a><br>
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<a href="ftp://shorewall.net/pub/shorewall/Beta" target="_top">ftp://shorewall.net/pub/shorewall/Beta</a><br>
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</div>
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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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/etc/shorewall/LogAndAccept and in that file, you would add the two
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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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</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> <b><img
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style="border: 0px solid ; width: 28px; height: 12px;"
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src="images/new10.gif" alt="(New)" title=""></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
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and problems from new users. I will not monitor that list
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personally. I will continue my active development of Shorewall and
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will be available via the development list to handle development
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issues -- Tom.
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<p><b><a href="News.htm">More News</a></b></p>
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<b></b>
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<h2><b></b></h2>
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<b></b>
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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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<b></b>
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<h4><b></b></h4>
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<b></b>
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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>
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<b></b></td>
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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>
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<table border="0" cellpadding="5" cellspacing="0"
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style="border-collapse: collapse; width: 100%; background-color: rgb(51, 102, 255);"
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id="AutoNumber2">
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<tbody>
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<tr>
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<td style="width: 100%; margin-top: 1px;">
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<p align="center"><a href="http://www.starlight.org"><img
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border="4" src="images/newlog.gif" width="57" height="100" align="left"
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hspace="10" alt="Starlight Foundation Logo"></a></p>
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<p align="center"><font size="4" color="#ffffff"><br>
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<font size="+2">Shorewall is free but if you try it and find it
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useful, please consider making a donation to <a
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href="http://www.starlight.org"><font color="#ffffff">Starlight
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Children's Foundation.</font></a> Thanks!</font></font></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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<p><font size="2">Updated 12/29/2003 - <a href="support.htm">Tom
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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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