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326 lines
14 KiB
HTML
326 lines
14 KiB
HTML
<!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 http-equiv="Content-Type"
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content="text/html; charset=windows-1252">
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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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<table cellpadding="0" cellspacing="4"
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style="border-collapse: collapse;" width="100%" id="AutoNumber3"
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bgcolor="#3366ff">
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<tbody>
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<tr>
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<td width="33%" height="90" valign="middle" align="center"><a
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href="http://www.cityofshoreline.com"> </a>
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<div align="center"> <img src="images/Logo1.png"
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alt="(Shorewall Logo)" width="430" height="90" align="middle"> </div>
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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 align="center">
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<div align="center"> </div>
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<center>
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<div align="center"> </div>
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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 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.<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
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ipchains 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 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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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
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General Public License</a> as published by the Free 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 details.<br>
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<br>
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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675 Mass Ave, Cambridge, MA 02139, USA</p>
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<p><a href="copyright.htm">Copyright 2001, 2002, 2003 Thomas M.
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Eastep</a></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
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and follow the step by step instructions.<br>
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<h2>Looking for Information?</h2>
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The <a href="shorewall_quickstart_guide.htm#Documentation">Documentation
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Index</a> is a good place to start as is the Quick Search to your
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right.
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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
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this site will not apply directly to your setup. If you want
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to use the documentation that you find here, you will want to consider
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uninstalling what you have and installing a setup that matches the
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documentation on this site. See the <a href="two-interface.htm">Two-interface
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QuickStart Guide</a> for details.<br>
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<h2>News</h2>
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<p><b>8/9/2003 - Snapshot 1.4.6_20030809</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><b> </b></p>
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<blockquote>
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<p><a href="http://shorewall.net/pub/shorewall/Snapshots/">http://shorewall.net/pub/shorewall/Snapshots/</a><br>
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<a href="ftp://shorewall.net/pub/shorewall/Snapshots/"
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target="_top">ftp://shorewall.net/pub/shorewall/Snapshots/</a></p>
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</blockquote>
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<b>Problems Corrected since version 1.4.6</b><br>
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<ol>
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<li>Corrected problem in 1.4.6 where the MANGLE_ENABLED
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variable was being tested before it was set.</li>
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<li>Corrected handling of MAC addresses in the SOURCE column of
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the tcrules file. Previously, these addresses resulted in an invalid
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iptables command.</li>
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<li>The "shorewall stop" command is now disabled when
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/etc/shorewall/startup_disabled exists. This prevents people from
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shooting themselves in the foot prior to having configured Shorewall.</li>
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<li>A change introduced in version 1.4.6 caused error messages
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during "shorewall [re]start" when ADD_IP_ALIASES=Yes and ip addresses
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were being added to a PPP interface; the addresses were successfully
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added in spite of the messages.<br>
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<br>
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The firewall script has been modified to eliminate the error messages<br>
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</li>
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</ol>
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<b>Migration Issues:</b><br>
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<ol>
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<li>Once you have installed this version of Shorewall, you must
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restart Shorewall before you may use the 'drop', 'reject', 'allow' or
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'save' commands.</li>
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<li>To maintain strict compatibility with previous versions,
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current uses of "shorewall drop" and "shorewall reject" should be
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replaced with "shorewall dropall" and "shorewall rejectall" </li>
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</ol>
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<b>New Features:</b><br>
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<ol>
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<li>Shorewall now creates a dynamic blacklisting chain for each
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interface defined in /etc/shorewall/interfaces. The 'drop' and 'reject'
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commands use the routing table to determine which of these chains is to
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be used for blacklisting the specified IP address(es).<br>
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<br>
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Two new commands ('dropall' and 'rejectall') have been introduced that
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do what 'drop' and 'reject' used to do; namely, when an address is
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blacklisted using these new commands, it will be blacklisted on all of
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your firewall's interfaces.</li>
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<li>Thanks to Steve Herber, the 'help' command can now give
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command-specific help (e.g., shorewall help <command>).</li>
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<li>A new option "ADMINISABSENTMINDED" has been added to
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/etc/shorewall/shorewall.conf. This option has a default value of "No"
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for existing users which causes Shorewall's 'stopped' state to
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continue as it has been; namely, in the stopped state only traffic
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to/from hosts listed in /etc/shorewall/routestopped is accepted.<br>
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<br>
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With ADMINISABSENTMINDED=Yes (the default for new installs), in
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addition to traffic to/from the hosts listed in
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/etc/shorewall/routestopped, Shorewall will allow:<br>
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<br>
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a) All traffic originating from the firewall itself; and<br>
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b) All traffic that is part of or related to an
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already-existing connection.<br>
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<br>
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In particular, with ADMINISABSENTMINDED=Yes, a "shorewall stop"
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entered through an ssh session will not kill the session.<br>
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<br>
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Note though that even with ADMINISABSENTMINDED=Yes, it is still
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possible for people to shoot themselves in the foot.<br>
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<br>
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Example:<br>
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<br>
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/etc/shorewall/nat:<br>
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<br>
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206.124.146.178
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eth0:0 192.168.1.5 <br>
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<br>
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/etc/shorewall/rules:<br>
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<br>
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ACCEPT net
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loc:192.168.1.5 tcp 22<br>
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ACCEPT loc
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fw tcp 22<br>
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<br>
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From a remote system, I ssh to 206.124.146.178 which establishes an SSH
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connection with local system 192.168.1.5. I then create a second SSH
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connection
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from that computer to the firewall and confidently type "shorewall
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stop".
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As part of its stop processing, Shorewall removes eth0:0 which kills my
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SSH
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connection to 192.168.1.5!!!</li>
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<li>Given the wide range of VPN software, I can never hope to
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add specific support for all of it. I have therefore decided to add
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"generic" tunnel support.<br>
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<br>
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Generic tunnels work pretty much like any of the other tunnel types.
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You usually add a zone to represent the systems at the other end of the
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tunnel and you add the appropriate rules/policies to<br>
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implement your security policy regarding traffic to/from those systems.<br>
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<br>
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In the /etc/shorewall/tunnels file, you can have entries of the form:<br>
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<br>
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generic:<protocol>[:<port>] <zone> <ip
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address> <gateway zones><br>
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<br>
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where:<br>
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<br>
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<protocol> is the protocol
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used by the tunnel<br>
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<port> if the protocol
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is 'udp' or 'tcp' then this is the destination port number used by the
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tunnel.<br>
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<zone> is the zone of
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the remote tunnel gateway<br>
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<ip address> is the IP
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address of the remote tunnel gateway.<br>
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<gateway zone>
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Optional. A comma-separated list of zone names. If specified, the
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remote gateway is to be considered part of these zones.</li>
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<li>An 'arp_filter' option has been added to the
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/etc/shorewall/interfaces file. This option causes
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/proc/sys/net/ipv4/conf/<interface>/arp_filter to be set with the
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result that this interface will only answer ARP 'who-has' requests from
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hosts that are routed out through that interface. Setting this option
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facilitates testing of your firewall where multiple firewall interfaces
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are connected to the same HUB/Switch (all interfaces connected to the
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single HUB/Switch should have this option specified). Note that using
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such a configuration in a production environment is strongly
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recommended against.<br>
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</li>
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</ol>
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<p><b>8/5/2003 - Shorewall-1.4.6b</b><b> <img border="0"
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src="images/new10.gif" width="28" height="12" alt="(New)"> <br>
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</b></p>
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<b>Problems Corrected since version 1.4.6:</b><br>
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<ol>
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<li>Previously, if TC_ENABLED is set to yes in shorewall.conf
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then Shorewall would fail to start with the error "ERROR: Traffic
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Control requires Mangle"; that problem has been corrected.</li>
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<li>Corrected handling of MAC addresses in the SOURCE column of
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the
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tcrules file. Previously, these addresses resulted in an invalid
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iptables
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command.</li>
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<li>The "shorewall stop" command is now disabled when
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/etc/shorewall/startup_disabled
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exists. This prevents people from shooting themselves in the foot prior
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to
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having configured Shorewall.</li>
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<li>A change introduced in version 1.4.6 caused error messages
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during
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"shorewall [re]start" when ADD_IP_ALIASES=Yes and ip addresses were
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being
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added to a PPP interface; the addresses were successfully added in
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spite
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of the messages.<br>
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<br>
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The firewall script has been modified to eliminate the error messages.<br>
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</li>
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</ol>
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<p><b></b></p>
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<ol>
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</ol>
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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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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) 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">
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http://leaf.sourceforge.net/devel/jnilo<br>
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</a></p>
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<b>Congratulations to Jacques
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and Eric on the recent release of Bering 1.2!!! </b><br>
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<h2><a name="Donations"></a>Donations</h2>
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</td>
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<td width="88" bgcolor="#3366ff" valign="top" align="center">
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<form method="post"
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action="http://lists.shorewall.net/cgi-bin/htsearch"> <strong><br>
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<font color="#ffffff"><b>Note: </b></font></strong><font
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color="#ffffff">Search is unavailable Daily 0200-0330 GMT.</font><br>
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<strong></strong>
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<p><font color="#ffffff"><strong>Quick Search</strong></font><br>
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<font face="Arial" size="-1"> <input type="text" name="words"
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size="15"></font><font size="-1"> </font> <font face="Arial"
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size="-1"> <input type="hidden" name="format" value="long"> <input
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type="hidden" name="method" value="and"> <input type="hidden"
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name="config" value="htdig"> <input type="submit" value="Search"></font>
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</p>
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<font face="Arial"> <input type="hidden" name="exclude"
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value="[http://lists.shorewall.net/pipermail/*]"> </font> </form>
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<p><font color="#ffffff"><b><a
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href="http://lists.shorewall.net/htdig/search.html"><font
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color="#ffffff">Extended Search</font></a></b></font></p>
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<br>
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</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%" id="AutoNumber2"
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bgcolor="#3366ff">
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<tbody>
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<tr>
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<td width="100%" style="margin-top: 1px;" valign="middle">
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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 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 8/9/2003 - <a href="support.htm">Tom Eastep</a></font>
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<br>
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</p>
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<br>
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</body>
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</html>
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