2005-05-20 00:17:37 +02:00
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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2003-12-30 02:19:52 +01:00
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2005-10-12 00:05:30 +02:00
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content="HTML Tidy for Linux (vers 1st April 2002), see www.w3.org">
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Shorewall News</title>
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<body>
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<h1 style="text-align: left;">Shorewall News and Announcements<br>
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</h1>
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<span style="font-weight: bold;">Tom Eastep<br>
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<br>
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</span>Copyright © 2001-2005 Thomas M. Eastep<br>
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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 “<span
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class="quote"><a href="GnuCopyright.htm" target="_self">GNU Free
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Documentation License</a></span>”.<br>
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</p>
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<p>2005-05-05<br>
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</p>
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<hr style="width: 100%; height: 2px;"> <span style="font-weight: bold;">10/05/2005
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Shorewall 2.4.5<br>
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</span>
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<br>
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Problems Corrected in 2.4.5<br>
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<br>
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<ol>
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<li>In previous versions, when the command is 'start', 'restart' or
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'stop' then OUTPUT traffic to hosts listed in
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/etc/shorewall/routestopped is not enabled if ADMINISABSENTMINDED=Yes.
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That traffic is now enabled independent of the setting of
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ADMINISABSENTMINDED.</li>
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<li>Although it was documented that icmp types could be used in the
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tcrules file, the code did not support it. Thanks to Jorge Molina, that
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problem is now corrected.</li>
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<li>In a multi-ISP configuration, fwmark routing rules now have a
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higher priority than source IP rules. This allows entries in tcrules to
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be more effective in controlling routing.</li>
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<li>Previously, not all of the mangle chains were flushed during
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"shorewall restart".</li>
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</ol>
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<span style="font-weight: bold;">09/12/2005 Shorewall 2.4.4<br>
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</span><br>
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Problems Corrected<br>
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<ol>
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<li>An incorrect comment in the /etc/shorewall/proxyarp file has been
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removed.</li>
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<li>The message generated when a duplicate policy has been entered is
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now more informative. Previously, only the POLICY column contents
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appeared in the message. Now the SOURCE, DEST and POLICY column
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contents are shown.</li>
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<li>Shorewall now clears the Netfilter "raw" table during "shorewall
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[re]start", "shorewall stop" and "shorewall clear" processing.</li>
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</ol>
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New Features<br>
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<ol>
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<li>Tunnel types "openvpnserver" and "openvpnclient" have been added
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to reflect the introduction of client and server OpenVPN configurations
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in OpenVPN 2.0.</li>
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<li>The COMMAND variable is now set to 'restore' in restore scripts.
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The value of this variable is sometimes of interest to programmers
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providing custom /etc/shorewall/tcstart scripts.<br>
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</li>
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</ol>
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<span style="font-weight: bold;">08/16/2005 Shorewall 2.4.3<br>
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</span><br>
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Problems Corrected:<br>
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<ol>
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<li>Shorewall is no longer dependent on the 'which' utility.</li>
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<li>The 'shorewall add' command failed if there existed a zone in the
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configuration that specified the 'ipsec' option in /etc/shorewall/hosts.</li>
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<li>Shorewall is no longer dependent on /bin/echo.</li>
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<li>A CLASSIFY rule with $FW in the SOURCE column (tcrules) no
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longer results in a "shorewall start" error.</li>
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<li>You may now use port lists in the DEST PORT and SOURCE PORT
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columns of the /etc/shorewall/accounting file.</li>
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<li>The "shorewall show capabilities" command now accurately reports
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the availability of "Packet type match" independent of the setting of
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PKTTYPE in shorewall.conf.</li>
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<li>Thanks to Tuomo Soini, all of the files have been siginificantly
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cleaned up in terms of formatting and extra white-space.<br>
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</li>
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</ol>
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New Features:<br>
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<ol>
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<li>New Allow.Submission and Allow.NTPbrd actions have been added.
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Users of the Allow.NTP action that use NTP broadcasting should switch
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to use of Allow.NTPbrd instead.</li>
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<li>The kernel version string is now included in the output of
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"shorewall status".<br>
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</li>
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</ol>
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<span style="font-weight: bold;">07/30/2005 Shorewall 2.2.6<br>
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<br>
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</span>Problems Corrected:<br>
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<ol>
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<li><a href="#20050717">MACLIST_TTL Vulnerability</a> fix.</li>
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<li>TCP_FLAGS_LOG_LEVEL=ULOG breaks with recent versions of iptables.</li>
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<li>The bogons file has been updated to reflect recent IANA
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allocations.</li>
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</ol>
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<span style="font-weight: bold;">07/21/2005 Shorewall 2.4.2<br>
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<br>
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</span>Problems Corrected:<br>
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<ol>
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<li>The /etc/shorewall/hosts file now includes information about
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defining a zone using one or more ipsets.</li>
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<li>A <a href="#20050717">vulnerability involving MACLIST_TTL > 0
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or MACLIST_DISPOSITION=ACCEPT</a> has been corrected.</li>
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<li>It is now possible to specify !<address> in the SUBNET
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column of /etc/shorewall/masq. Previously, it was necessary to write
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0.0.0.0/0!<address>.</li>
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<li>When <network1>!<network2> was specified in the
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SUBNET column of /etc/shorewall/masq, IPSEC policies were not correctly
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applied to the resulting rules. This usually resulted in IPSEC not
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working through the interface specified in the INTERFACES column.<br>
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</li>
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</ol>
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New Features:<br>
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<ol>
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<li> A 'loose' provider option has been added. If you wish to be able
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to use marking to specify the gateway used by connections originating
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on the firewall itself, the specify 'loose' for each provider. It has
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bee reported that 'loose' may break the effect of 'track' so beware if
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you need 'track' functionality (you shouldn't be originating many
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connections from your firewall to the net anyway).<br>
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<br>
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To use 'loose', you also need to add two entries in /etc/shorewall/masq:<br>
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<pre><span style="font-family: monospace;">#INTERFACE SUBNET ADDRESS<br>
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2005-09-23 02:12:12 +02:00
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$IF_ISP1 $IP_ISP2 $IP_ISP1<br>
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$IF_ISP2 $IP_ISP1 $IP_ISP2</span>
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2005-10-12 00:05:30 +02:00
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</pre>
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where:<br>
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<pre> $IF_ISP1 is the interface to ISP 1.<br>
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2005-09-23 02:12:12 +02:00
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$IF_ISP2 is the interface to ISP 2.<br>
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$IP_ISP1 is the IP address of $IF_ISP1<br>
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$IP_ISP2 is the IP address of $IF_ISP2
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2005-10-12 00:05:30 +02:00
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</pre>
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</li>
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<li>/sbin/shorewall now issues a warning each time that it finds that
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startup is disabled.</li>
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<li>A new COPY column has been added to the /etc/shorewall/providers
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file. Normally, when a table name/number is given in the DUPLICATE
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column, the entire table (less default routes) is copied. The COPY
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column allows you to limit the routes copied to those that go through
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an interface listed in COPY. For example, if you enter eth0 in
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INTERFACE, "eth1,eth2" in COPY and 'main' in DUPLICATE then the new
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table created will contain those routes through the interfaces eth0,
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eth1 and eth2.<br>
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</li>
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</ol>
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<hr style="width: 100%; height: 2px;">
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<h2><a name="20050717"></a><font color="#ff0000">07/17/2005 Security
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vulnerability in MACLIST processing</font></h2>
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<h3>Description</h3>
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<p>A security vulnerability has been discovered which affects all
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supported stable versions of Shorewall. This vulnerability
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enables a client accepted by MAC address filtering to bypass any other
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rule. If MACLIST_TTL is set to a value greater than 0 or
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MACLIST_DISPOSITION is set to "ACCEPT" in /etc/shorewall/shorewall.conf
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(default is MACLIST_TTL=0 and MACLIST_DISPOSITION=REJECT), and a client
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is positively identified through its MAC address, it bypasses all other
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policies/rules in place, thus gaining access to all open services on
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the firewall.</p>
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<h3>Fix</h3>
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<h4>Workaround</h4>
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<p>For Shorewall 2.2.x or 2.4.x, set MACLIST_TTL=0 or
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MACLIST_DISPOSITION=REJECT in /etc/shorewall/shorewall.conf. For
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Shorewall 2.0.x, set MACLIST_DISPOSITION=REJECT in
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/etc/shorewall/shorewall.conf. MACLIST filtering is of limited
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value on Internet-connected hosts, and the Shorewall team recommends
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this approach to be used if possible.</p>
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<h4>Upgrade</h4>
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<p>For Shorewall 2.4.x, a fixed version of the 'firewall' script is
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available at: <a
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href="http://shorewall.net/pub/shorewall/2.4/shorewall-2.4.1/errata/firewall">
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http://shorewall.net/pub/shorewall/2.4/shorewall-2.4.1/errata/firewall</a>
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and its mirrors, <a
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href="http://www.shorewall.net/pub/shorewall/2.4/shorewall-2.4.1/errata/firewall">
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http://www.shorewall.net/pub/shorewall/2.4/shorewall-2.4.1/errata/firewall</a>
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and <a
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href="http://slovakia.shorewall.net/pub/shorewall/2.4/shorewall-2.4.1/errata/firewall">
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http://slovakia.shorewall.net/pub/shorewall/2.4/shorewall-2.4.1/errata/firewall</a>.</p>
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<p>For Shorewall 2.2.x, a fixed version of the 'firewall' script is
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available at: <a
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href="http://shorewall.net/pub/shorewall/2.2/shorewall-2.2.5/errata/firewall">
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http://shorewall.net/pub/shorewall/2.2/shorewall-2.2.5/errata/firewall</a>
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and its mirrors, <a
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href="http://www.shorewall.net/pub/shorewall/2.2/shorewall-2.2.5/errata/firewall">
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http://www.shorewall.net/pub/shorewall/2.2/shorewall-2.2.5/errata/firewall</a>
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and <a
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href="http://slovakia.shorewall.net/pub/shorewall/2.2/shorewall-2.2.5/errata/firewall">
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http://slovakia.shorewall.net/pub/shorewall/2.2/shorewall-2.2.5/errata/firewall</a>.</p>
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<p>For Shorewall 2.0.x, a fixed version of the 'firewall' script is
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available at: <a
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href="http://shorewall.net/pub/shorewall/errata/2.0.17/firewall">http://shorewall.net/pub/shorewall/errata/2.0.17/firewall</a>
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and its mirrors, <a
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href="http://www.shorewall.net/pub/shorewall/errata/2.0.17/firewall">
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http://www.shorewall.net/pub/shorewall/errata/2.0.17/firewall</a> and <a
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href="http://slovakia.shorewall.net/pub/shorewall/errata/2.0.17/firewall">
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http://slovakia.shorewall.net/pub/shorewall/errata/2.0.17/firewall</a>.</p>
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<p>Users of any version before 2.0.17 are urged to upgrade to a
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supported version of Shorewall (preferably 2.4.1) before using the
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fixed files. Only the most recent version of the 2.0.x and 2.2.x
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streams will be supported by the development team, and the 1.x branches
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are no longer maintained at all. Future releases of Shorewall
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will include this fix.</p>
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<p>This information was based on <a
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href="http://seclists.org/lists/fulldisclosure/2005/Jul/0409.html">Patrick
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Blitz's post to the Full Disclosure mailing list</a>. Thanks to
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Supernaut (supernaut at ns dot sympatico dot ca) for reporting this bug.<br>
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</p>
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<p><span style="font-weight: bold;">Version Upgrade<br>
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</span></p>
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<p>The vulnerability is corrected in Shorewall 2.4.2 and in Shorewall
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2.2.6.<br>
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</p>
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<hr style="width: 100%; height: 2px;"> <span style="font-weight: bold;">07/13/2005
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Shorewall 2.4.1<br>
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</span><br>
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Problems Corrected:<br>
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<ol>
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<li>Shell variables may now be used in the zones file.</li>
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<li>The /usr/share/shorewall/bogons file has been updated to reflect
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recent IANA allocations.</li>
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<li>Shorewall now detects an error where multiple providers specify
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the 'track' option on the same interface.</li>
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<li>The remnants of the GATEWAY column in /etc/shorewall/interfaces
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have been removed. This column appeared briefly in one of the Beta
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versions and was immediately removed but some vestiges remained.</li>
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<li>Shorewall now correctly restores a load-balancing default route
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during processing of the 'shorewall restore' and 'shorewall -f start'
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commands. The latter command is normally executed by the Shorewall init
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script during reboot.</li>
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<li>A log level of "None!" is now allowed on builtin actions such as
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ACCEPT and DROP.</li>
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<li>Previously, LIMIT:BURST parameters in /etc/shorewall/policy were
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not correctly applied when the policy was QUEUE.</li>
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<li>The 'chkconfig' command on FC4 and Mandriva previously created
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symbolic links with incorrect names ("S-1shorewall"). The init script
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has been changed to prevent this incorrect behavior.</li>
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<li>DHCP traffic forwarded through a bridge could, under some
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configurations, be filtered by the 'maclist' option even though the
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'dhcp' option was specified. This has been corrected.<br>
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</li>
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</ol>
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<span style="font-weight: bold;">06/05/2005 Shorewall 2.4.0<br>
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<br>
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Note:</span> Because of the short time that has elapsed since the
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release of Shorewall 2.2.0, Shorewall 2.0 will be supported until 1
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December 2005 or until the release of Shorewall 2.6.0, whichever occurs
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first.<br>
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<br>
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New Features:<br>
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<ol>
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<li>Shorewall 2.4.0 includes support for multiple internet interfaces
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|
|
to different ISPs.<br>
|
|
|
|
|
<br>
|
|
|
|
|
The file /etc/shorewall/providers may be used to define the different
|
|
|
|
|
providers. It can actually be used to define alternate routing tables
|
|
|
|
|
so uses like transparent proxy can use the file as well.<br>
|
|
|
|
|
<br>
|
|
|
|
|
Columns are:<br>
|
|
|
|
|
<br>
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
NAME
|
|
|
|
|
The provider name.</span><br style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
NUMBER The
|
|
|
|
|
provider number -- a number between 1 and 15</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
MARK
|
|
|
|
|
A FWMARK value used in your /etc/shorewall/tcrules file to direct
|
|
|
|
|
packets for this provider.</span><br style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
DUPLICATE The name of an existing
|
|
|
|
|
table to duplicate. May</span> <span style="font-family: monospace;">be
|
|
|
|
|
'main' or the name of a previous provider.</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
INTERFACE The name of the network
|
|
|
|
|
interface to the</span> <span style="font-family: monospace;">provider.
|
|
|
|
|
Must be listed in</span><span style="font-family: monospace;">/etc/shorewall/interfaces.</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
GATEWAY The IP address
|
|
|
|
|
of the provider's gateway router.</span> <span
|
|
|
|
|
style="font-family: monospace;">If you enter "detect" here then
|
|
|
|
|
Shorewall<br>
|
|
|
|
|
|
|
|
|
|
will</span> <span style="font-family: monospace;">attempt to determine
|
|
|
|
|
the gateway IP address</span> <span style="font-family: monospace;">automatically.</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
OPTIONS A
|
|
|
|
|
comma-separated list selected from the</span> <span
|
|
|
|
|
style="font-family: monospace;">following:</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
track If specified, connections FROM this interface are</span>
|
|
|
|
|
<span style="font-family: monospace;">to be tracked so that
|
|
|
|
|
responses may be<br>
|
|
|
|
|
|
|
|
|
|
routed</span> <span style="font-family: monospace;">back out this same
|
|
|
|
|
interface.</span><br style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
You want specify 'track' if internet hosts will be</span> <span
|
|
|
|
|
style="font-family: monospace;">connecting to local servers through<br>
|
|
|
|
|
|
|
|
|
|
this</span> <span style="font-family: monospace;">provider.</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
Because of limitations in the 'ip' utility and</span> <span
|
|
|
|
|
style="font-family: monospace;">policy routing, you may not use the
|
|
|
|
|
SAVE or</span><span style="font-family: monospace;"><br>
|
|
|
|
|
|
|
|
|
|
RESTORE tcrules options or use connection</span><span
|
|
|
|
|
style="font-family: monospace;">marking on any traffic to or from this</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
interface. For traffic control purposes, you</span> <span
|
|
|
|
|
style="font-family: monospace;">must mark packets in the FORWARD chain
|
|
|
|
|
(or</span><span style="font-family: monospace;"><br>
|
|
|
|
|
|
|
|
|
|
better yet, use the CLASSIFY target).</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
balance The providers that have 'balance' specified will</span> <span
|
|
|
|
|
style="font-family: monospace;">get outbound traffic load-balanced
|
|
|
|
|
among<br>
|
|
|
|
|
|
|
|
|
|
them. By</span> <span style="font-family: monospace;">default, all
|
|
|
|
|
interfaces with 'balance' specified</span> <span
|
|
|
|
|
style="font-family: monospace;">will have the same weight (1).<br>
|
|
|
|
|
|
|
|
|
|
You can change the</span><span style="font-family: monospace;">weight
|
|
|
|
|
of the route out of the interface by</span> <span
|
|
|
|
|
style="font-family: monospace;">specifiying balance=<weight><br>
|
|
|
|
|
|
|
|
|
|
where <weight> is</span><span style="font-family: monospace;">the
|
|
|
|
|
desired route weight.</span><br style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
Example: You run squid in
|
|
|
|
|
your DMZ on IP address 192.168.2.99. Your DMZ interface is eth2<br>
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
#NAME NUMBER MARK DUPLICATE INTERFACE
|
|
|
|
|
GATEWAY OPTIONS</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
Squid 1
|
|
|
|
|
1
|
|
|
|
|
-
|
|
|
|
|
eth2 192.168.2.99 -</span><br>
|
|
|
|
|
<br>
|
|
|
|
|
Use of this feature requires that your kernel and iptabls support
|
|
|
|
|
CONNMARK target and conntrack match support. It does NOT require the
|
|
|
|
|
ROUTE target extension.<br>
|
|
|
|
|
<br>
|
|
|
|
|
WARNING: The current version of iptables (1.3.1) is broken with respect
|
|
|
|
|
to CONNMARK and iptables-save/iptables-restore. This means that if you
|
|
|
|
|
configure multiple ISPs, "shorewall restore" may fail. You must patch
|
|
|
|
|
your iptables using the patch at <a
|
|
|
|
|
href="http://shorewall.net/pub/shorewall/contrib/iptables/CONNMARK.diff">
|
|
|
|
|
http://shorewall.net/pub/shorewall/contrib/iptables/CONNMARK.diff</a>.<br>
|
|
|
|
|
<br>
|
|
|
|
|
</li>
|
|
|
|
|
<li>Shorewall 2.3.0 supports the 'cmd-owner' option of the owner
|
|
|
|
|
match facility in Netfilter. Like all owner match options, 'cmd-owner'
|
|
|
|
|
may only be applied to traffic that originates on the firewall.<br>
|
|
|
|
|
<br>
|
|
|
|
|
The syntax of the USER/GROUP column in the following files has been
|
|
|
|
|
extended:<br>
|
|
|
|
|
<br>
|
|
|
|
|
/etc/shorewall/accounting<br>
|
|
|
|
|
/etc/shorewall/rules<br>
|
|
|
|
|
/etc/shorewall/tcrules<br>
|
|
|
|
|
|
|
|
|
|
/usr/share/shorewall/action.template<br>
|
|
|
|
|
<br>
|
|
|
|
|
To specify a command, prefix the command name with "+".<br>
|
|
|
|
|
<br>
|
|
|
|
|
Examples:<br>
|
|
|
|
|
<br>
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
+mozilla-bin
|
|
|
|
|
#The program is named "mozilla-bin"</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
joe+mozilla-bin #The
|
|
|
|
|
program is named "mozilla-bin" and</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
#is being run by user "joe"</span><br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
joe:users+mozilla-bin #The program is named "mozilla-bin"
|
|
|
|
|
and</span><br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
#is being run by user "joe" with</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
#effective group "users".</span><br style="font-family: monospace;">
|
|
|
|
|
<br>
|
|
|
|
|
Note that this is not a particularly robust feature and I
|
|
|
|
|
would never advertise it as a "Personal Firewall" equivalent. Using
|
|
|
|
|
symbolic links, it's easy to alias command names to be anything you
|
|
|
|
|
want.<br>
|
|
|
|
|
<br>
|
|
|
|
|
</li>
|
|
|
|
|
<li>Support has been added for ipsets (see <a
|
|
|
|
|
href="http://people.netfilter.org/kadlec/ipset/">http://people.netfilter.org/kadlec/ipset/</a>).<br>
|
|
|
|
|
<br>
|
|
|
|
|
In most places where a host or network address may be used, you may
|
|
|
|
|
also use the name of an ipset prefaced by "+".<br>
|
|
|
|
|
<br>
|
|
|
|
|
Example: "+Mirrors"<br>
|
|
|
|
|
<br>
|
|
|
|
|
The name of the set may be optionally followed by:<br>
|
|
|
|
|
<br>
|
|
|
|
|
a) a number from 1 to 6 enclosed in square brackets ([]) -- this number
|
|
|
|
|
indicates the maximum number of ipset binding levels that are to be
|
|
|
|
|
matched. Depending on the context where the ipset name is used, either
|
|
|
|
|
all "src" or all "dst" matches will be used.<br>
|
|
|
|
|
<br>
|
|
|
|
|
Example: "+Mirrors[4]"<br>
|
|
|
|
|
<br>
|
|
|
|
|
b) a series of "src" and "dst" options separated by commas and inclosed
|
|
|
|
|
in square brackets ([]). These will be passed directly to iptables in
|
|
|
|
|
the generated --set clause. See the ipset documentation for details.<br>
|
|
|
|
|
<br>
|
|
|
|
|
Example:
|
|
|
|
|
"+Mirrors[src,dst,src]"<br>
|
|
|
|
|
<br>
|
|
|
|
|
Note that "+Mirrors[4]" used in the SOURCE column of the rules file is
|
|
|
|
|
equivalent to "+Mirrors[src,src,src,src]".<br>
|
|
|
|
|
<br>
|
|
|
|
|
To generate a negative match, prefix the "+" with "!" as in "!+Mirrors".<br>
|
|
|
|
|
<br>
|
|
|
|
|
Example 1: Blacklist all hosts in an ipset named "blacklist"<br>
|
|
|
|
|
<br>
|
|
|
|
|
|
|
|
|
|
/etc/shorewall/blacklist<br>
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
#ADDRESS/SUBNET
|
|
|
|
|
PROTOCOL PORT</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
+blacklist</span><br style="font-family: monospace;">
|
|
|
|
|
<br>
|
|
|
|
|
Example 2: Allow SSH from all hosts in an ipset named "sshok:<br>
|
|
|
|
|
<br>
|
|
|
|
|
|
|
|
|
|
/etc/shorewall/rules<br>
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
#ACTION
|
|
|
|
|
SOURCE DEST
|
|
|
|
|
PROTO DEST PORT(S)</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
ACCEPT
|
|
|
|
|
+sshok
|
|
|
|
|
fw
|
|
|
|
|
tcp 22</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br>
|
|
|
|
|
Shorewall can automatically capture the contents of your ipsets for
|
|
|
|
|
you. If you specify SAVE_IPSETS=Yes in /etc/shorewall/shorewall.conf
|
|
|
|
|
then "shorewall save" will save the contents of your ipsets. The file
|
|
|
|
|
where the sets are saved is formed by taking the name where the
|
|
|
|
|
Shorewall configuration is stored and appending "-ipsets". So if you
|
|
|
|
|
enter the command "shorewall save standard" then your Shorewall
|
|
|
|
|
configuration will be saved in var/lib/shorewall/standard and your
|
|
|
|
|
ipset contents will be saved in /var/lib/shorewall/standard-ipsets.
|
|
|
|
|
Assuming the default RESTOREFILE setting, if you just enter "shorewall
|
|
|
|
|
save" then your Shorewall configuration will be saved in
|
|
|
|
|
/var/lib/shorewall/restore and your ipset contents will be saved in
|
|
|
|
|
/var/lib/shorewall/restore-ipsets.<br>
|
|
|
|
|
<br>
|
|
|
|
|
Regardless of the setting of SAVE_IPSETS, the "shorewall -f start" and
|
|
|
|
|
"shorewall restore" commands will restore the ipset contents
|
|
|
|
|
corresponding to the Shorewall configuration restored provided that the
|
|
|
|
|
saved Shorewall configuration specified exists.<br>
|
|
|
|
|
<br>
|
|
|
|
|
For example, "shorewall restore standard" would restore the ipset
|
|
|
|
|
contents from /var/lib/shorewall/standard-ipsets provided that
|
|
|
|
|
/var/lib/shorewall/standard exists and is executable and that
|
|
|
|
|
/var/lib/shorewall/standard-ipsets exists and is executable.<br>
|
|
|
|
|
<br>
|
|
|
|
|
Also regardless of the setting of SAVE_IPSETS, the "shorewall forget"
|
|
|
|
|
command will purge the saved ipset information (if any) associated with
|
|
|
|
|
the saved shorewall configuration being removed.<br>
|
|
|
|
|
<br>
|
|
|
|
|
You can also associate ipset contents with Shorewall configuration
|
|
|
|
|
directories using the following command:<br>
|
|
|
|
|
<br>
|
|
|
|
|
ipset -S > <config
|
|
|
|
|
directory>/ipsets<br>
|
|
|
|
|
<br>
|
|
|
|
|
Example:<br>
|
|
|
|
|
<br>
|
|
|
|
|
ipset -S > /etc/shorewall/ipsets<br>
|
|
|
|
|
<br>
|
|
|
|
|
When you start or restart Shorewall (including using the 'try' command)
|
|
|
|
|
from the configuration directory, your ipsets will be configured from
|
|
|
|
|
the saved ipsets file. Once again, this behavior is independent of the
|
|
|
|
|
setting of SAVE_IPSETS.<br>
|
|
|
|
|
<br>
|
|
|
|
|
Ipsets are well suited for large blacklists. You can maintain your
|
|
|
|
|
blacklist using the 'ipset' utility without ever having to restart or
|
|
|
|
|
refresh Shorewall. If you use the SAVE_IPSETS=Yes feature just be sure
|
|
|
|
|
to "shorewall save" after altering the blacklist ipset(s).<br>
|
|
|
|
|
<br>
|
|
|
|
|
Example /etc/shorewall/blacklist:<br>
|
|
|
|
|
<br>
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
#ADDRESS/SUBNET
|
|
|
|
|
PROTOCOL PORT</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
+Blacklist[src,dst]</span><br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
+Blacklistnets[src,dst]</span><br style="font-family: monospace;">
|
|
|
|
|
<br>
|
|
|
|
|
Create the blacklist ipsets using:<br>
|
|
|
|
|
<br>
|
|
|
|
|
ipset -N
|
|
|
|
|
Blacklist iphash<br>
|
|
|
|
|
ipset -N
|
|
|
|
|
Blacklistnets nethash<br>
|
|
|
|
|
<br>
|
|
|
|
|
Add entries<br>
|
|
|
|
|
<br>
|
|
|
|
|
ipset -A Blacklist 206.124.146.177<br>
|
|
|
|
|
ipset -A Blacklistnets
|
|
|
|
|
206.124.146.0/24<br>
|
|
|
|
|
<br>
|
|
|
|
|
To allow entries for individual ports<br>
|
|
|
|
|
<br>
|
|
|
|
|
ipset -N SMTP portmap --from 1
|
|
|
|
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--to 31<br>
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|
ipset -A SMTP 25<br>
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|
<br>
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|
ipset -A Blacklist 206.124.146.177<br>
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ipset -B Blacklist 206.124.146.177
|
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|
-b SMTP<br>
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|
<br>
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Now only port 25 will be blocked from 206.124.146.177.<br>
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|
<br>
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|
</li>
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|
|
<li>Shorewall 2.4.0 can now configure routing if your kernel and
|
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|
|
iptables support the ROUTE target extension. This extension is
|
|
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|
|
available in Patch-O-Matic-ng. This feature is *EXPERIMENTAL* since the
|
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|
Netfilter team have no intention of ever releasing the ROUTE target
|
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|
|
extension to kernel.org.<br>
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|
<br>
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Routing is configured using the /etc/shorewall/routes file. Columns in
|
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|
the file are as follows:<br>
|
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|
<br>
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|
<span style="font-family: monospace;">
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|
SOURCE
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|
Source of the packet. May be any of the</span> <span
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|
style="font-family: monospace;">following:</span><br
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|
style="font-family: monospace;">
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|
<br style="font-family: monospace;">
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|
<br style="font-family: monospace;">
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<span style="font-family: monospace;">
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- A host or network address</span><br style="font-family: monospace;">
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|
<span style="font-family: monospace;">
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|
- A network interface name.</span><br style="font-family: monospace;">
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|
<span style="font-family: monospace;">
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|
- The name of an ipset prefaced with "+"</span><br
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style="font-family: monospace;">
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|
<span style="font-family: monospace;">
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|
- $FW (for packets originating on the firewall)</span><br
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style="font-family: monospace;">
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|
<span style="font-family: monospace;">
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|
- A MAC address in Shorewall format</span><br
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style="font-family: monospace;">
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<span style="font-family: monospace;">
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- A range of IP addresses (assuming that your</span> <span
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|
style="font-family: monospace;">kernel and iptables support range
|
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|
|
match)</span><br style="font-family: monospace;">
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|
<span style="font-family: monospace;">
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- A network interface name followed by ":"</span> <span
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|
style="font-family: monospace;">and an address or address range.</span><br
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style="font-family: monospace;">
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<br style="font-family: monospace;">
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<span style="font-family: monospace;">
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|
DEST
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|
Destination of the packet. May be any of the</span> <span
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|
style="font-family: monospace;">following:</span><br
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style="font-family: monospace;">
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|
<br style="font-family: monospace;">
|
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|
<span style="font-family: monospace;">
|
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|
|
- A host or network address</span><br style="font-family: monospace;">
|
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|
<span style="font-family: monospace;">
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|
|
- A network interface name (determined from</span><br
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|
style="font-family: monospace;">
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|
<span style="font-family: monospace;">
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|
routing table(s))</span><br style="font-family: monospace;">
|
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|
<span style="font-family: monospace;">
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|
|
- The name of an ipset prefaced with "+"</span><br
|
|
|
|
|
style="font-family: monospace;">
|
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|
|
|
<span style="font-family: monospace;">
|
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|
|
- A network interface name followed by ":"</span><br
|
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|
style="font-family: monospace;">
|
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|
|
<span style="font-family: monospace;">
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|
|
and an address or address range.</span><br
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|
style="font-family: monospace;">
|
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|
<br style="font-family: monospace;">
|
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|
|
<span style="font-family: monospace;">
|
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|
|
PROTO
|
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|
|
Protocol - Must be "tcp", "udp", "icmp",</span> <span
|
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|
|
style="font-family: monospace;">"ipp2p", a number, or "all". "ipp2p"
|
|
|
|
|
requires</span><span style="font-family: monospace;"><br>
|
|
|
|
|
|
|
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|
|
ipp2p match support in your kernel and</span><span
|
|
|
|
|
style="font-family: monospace;">iptables.</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
PORT(S) Destination
|
|
|
|
|
Ports. A comma-separated list of</span> <span
|
|
|
|
|
style="font-family: monospace;">Port names (from /etc/services), port<br>
|
|
|
|
|
|
|
|
|
|
numbers</span> <span style="font-family: monospace;">or port ranges;
|
|
|
|
|
if the protocol is "icmp", this</span><span
|
|
|
|
|
style="font-family: monospace;">column is interpreted as the<br>
|
|
|
|
|
|
|
|
|
|
destination</span> <span style="font-family: monospace;">icmp-type(s).</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
If the protocol is ipp2p, this column is</span> <span
|
|
|
|
|
style="font-family: monospace;">interpreted as an ipp2p option without
|
|
|
|
|
the</span><span style="font-family: monospace;"><br>
|
|
|
|
|
|
|
|
|
|
leading "--" (example "bit" for bit-torrent).</span> <span
|
|
|
|
|
style="font-family: monospace;">If no PORT is given, "ipp2p" is
|
|
|
|
|
assumed.</span><br style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
This column is ignored if PROTOCOL = all but</span> <span
|
|
|
|
|
style="font-family: monospace;">must be entered if any of the following<br>
|
|
|
|
|
|
|
|
|
|
field</span> <span style="font-family: monospace;">is supplied. In
|
|
|
|
|
that case, it is suggested that</span> <span
|
|
|
|
|
style="font-family: monospace;">this field contain "-"</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
SOURCE PORT(S) (Optional) Source port(s). If omitted,</span> <span
|
|
|
|
|
style="font-family: monospace;">any source port is acceptable.
|
|
|
|
|
Specified as a</span><span style="font-family: monospace;"><br>
|
|
|
|
|
|
|
|
|
|
comma-separated list of port names, port</span> <span
|
|
|
|
|
style="font-family: monospace;">numbers or port ranges.</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
TEST
|
|
|
|
|
Defines a test on the existing packet or</span> <span
|
|
|
|
|
style="font-family: monospace;">connection mark.</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
The rule will match only if the test returns</span> <span
|
|
|
|
|
style="font-family: monospace;">true. Tests have the format</span><span
|
|
|
|
|
style="font-family: monospace;"><br>
|
|
|
|
|
|
|
|
|
|
[!]<value>[/<mask>][:C]</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
Where:</span><br style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
! Inverts the test (not equal)</span>
|
|
|
|
|
<span style="font-family: monospace;"><value> Value of the
|
|
|
|
|
packet or</span><span style="font-family: monospace;"><br>
|
|
|
|
|
|
|
|
|
|
connection mark.</span><br style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
<mask> A mask to be applied to the</span> <span
|
|
|
|
|
style="font-family: monospace;">mark before testing</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
:C Designates a connection</span> <span
|
|
|
|
|
style="font-family: monospace;">mark. If omitted, the packet</span> <span
|
|
|
|
|
style="font-family: monospace;">mark's value<br>
|
|
|
|
|
|
|
|
|
|
is tested.</span><br style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
INTERFACE The interface that the
|
|
|
|
|
packet is to be routed</span> <span style="font-family: monospace;">out
|
|
|
|
|
of. If you do not specify this<br>
|
|
|
|
|
|
|
|
|
|
field then</span> <span style="font-family: monospace;">you must place
|
|
|
|
|
"-" in this column and enter an</span> <span
|
|
|
|
|
style="font-family: monospace;">IP address in the GATEWAY<br>
|
|
|
|
|
|
|
|
|
|
column.</span><br style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style="font-family: monospace;">
|
|
|
|
|
GATEWAY The gateway
|
|
|
|
|
that the packet is to be forewarded</span> <span
|
|
|
|
|
style="font-family: monospace;">through.</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
</li>
|
|
|
|
|
<li>Normally when Shorewall is stopped, starting or restarting then
|
|
|
|
|
connections are allowed from hosts listed in
|
|
|
|
|
/etc/shorewall/routestopped to the firewall and to other hosts listed
|
|
|
|
|
in /etc/shorewall/routestopped.<br>
|
|
|
|
|
<br>
|
|
|
|
|
A new 'source' option is added for entries in that file which will
|
|
|
|
|
cause Shorewall to allow traffic from the host listed in the entry to
|
|
|
|
|
ANY other host. When 'source' is specified in an entry, it is
|
|
|
|
|
unnecessary to also specify 'routeback'.<br>
|
|
|
|
|
<br>
|
|
|
|
|
Similarly, a new 'dest' option is added which will cause Shorewall to
|
|
|
|
|
allow traffic to the host listed in the entry from ANY other host. When
|
|
|
|
|
'source' is specified in an entry, it is unnecessary to also specify
|
|
|
|
|
'routeback'.<br>
|
|
|
|
|
<br>
|
|
|
|
|
</li>
|
|
|
|
|
<li>This change was implemented by Lorenzo Martignoni. It provides
|
|
|
|
|
two new commands: "safe-start" and "safe-restart".<br>
|
|
|
|
|
<br>
|
|
|
|
|
<span style="font-weight: bold;">safe-start</span> starts Shorewall
|
|
|
|
|
then prompts you to ask you if everything looks ok. If you answer "no"
|
|
|
|
|
or if you don't answer within 60 seconds, a "shorewall clear" is
|
|
|
|
|
executed.<br>
|
|
|
|
|
<br>
|
|
|
|
|
<span style="font-weight: bold;">safe-restart</span> saves your
|
|
|
|
|
current configuration to /var/lib/shorewall/safe-restart then issues a
|
|
|
|
|
"shorewall restart"; It then prompts you to ask if you if you want to
|
|
|
|
|
accept the new configuration. If you answer "no" or if you don't answer
|
|
|
|
|
within 60 seconds, the configuration is restored to its prior state.<br>
|
|
|
|
|
<br>
|
|
|
|
|
These new commands require either that your /bin/sh supports the "-t"
|
|
|
|
|
option to the 'read' command or that you have /bin/bash installed.<br>
|
|
|
|
|
</li>
|
|
|
|
|
</ol>
|
|
|
|
|
<span style="font-weight: bold;">Old News <a href="oldnews.html">here</a><br>
|
|
|
|
|
</span>
|
|
|
|
|
</body>
|
2003-12-30 02:19:52 +01:00
|
|
|
</html>
|
