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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2005-09-23 02:12:12 +02:00
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2003-12-30 02:19:52 +01:00
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2005-09-23 02:12:12 +02:00
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<meta name="generator" content=
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"HTML Tidy for Linux (vers 1st April 2002), see www.w3.org">
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"text/html; charset=UTF-8">
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<title>Shorewall News</title>
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</head>
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<body>
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<h1 style="text-align: left;">Shorewall News and
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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,
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Version 1.2 or any later version published by the Free Software
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Foundation; with no Invariant Sections, with no Front-Cover,
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and with no Back-Cover Texts. A copy of the license is included
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in the section entitled “<span class="quote"><a href=
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"GnuCopyright.htm" target="_self">GNU Free Documentation
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License</a></span>”.<br>
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</p>
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<p>2005-09-12<br>
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</p>
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<hr style="width: 100%; height: 2px;">
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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
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has been removed.</li>
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<li>The message generated when a duplicate policy has been
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entered is now more informative. Previously, only the POLICY
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column contents appeared in the message. Now the SOURCE, DEST
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and POLICY column contents are shown.</li>
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<li>Shorewall now clears the Netfilter "raw" table during
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"shorewall [re]start", "shorewall stop" and "shorewall clear"
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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
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been added to reflect the introduction of client and server
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OpenVPN configurations in OpenVPN 2.0.</li>
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<li>The COMMAND variable is now set to 'restore' in restore
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scripts. The value of this variable is sometimes of interest
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to programmers providing custom /etc/shorewall/tcstart
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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'
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utility.</li>
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<li>The 'shorewall add' command failed if there existed a
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zone in the configuration that specified the 'ipsec' option
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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
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(tcrules) no longer results in a "shorewall start"
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error.</li>
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<li>You may now use port lists in the DEST PORT and SOURCE
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PORT columns of the /etc/shorewall/accounting file.</li>
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<li>The "shorewall show capabilities" command now accurately
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reports the availability of "Packet type match" independent
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of the setting of PKTTYPE in shorewall.conf.</li>
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<li>Thanks to Tuomo Soini, all of the files have been
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siginificantly cleaned up in terms of formatting and extra
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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
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added. Users of the Allow.NTP action that use NTP
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broadcasting should switch to use of Allow.NTPbrd
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instead.</li>
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<li>The kernel version string is now included in the output
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of "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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2004-10-25 17:52:26 +02:00
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<br>
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2005-09-23 02:12:12 +02:00
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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>
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fix.</li>
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<li>TCP_FLAGS_LOG_LEVEL=ULOG breaks with recent versions of
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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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2005-09-23 02:12:12 +02:00
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</span>Problems Corrected:<br>
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2004-10-25 17:52:26 +02:00
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<ol>
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2005-09-23 02:12:12 +02:00
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<li>The /etc/shorewall/hosts file now includes information
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about defining a zone using one or more ipsets.</li>
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<li>A <a href="#20050717">vulnerability involving MACLIST_TTL
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> 0 or MACLIST_DISPOSITION=ACCEPT</a> has been
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corrected.</li>
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<li>It is now possible to specify !<address> in the
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SUBNET column of /etc/shorewall/masq. Previously, it was
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necessary to write 0.0.0.0/0!<address>.</li>
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<li>When <network1>!<network2> was specified in
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the SUBNET column of /etc/shorewall/masq, IPSEC policies were
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not correctly applied to the resulting rules. This usually
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resulted in IPSEC not working through the interface specified
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in the INTERFACES column.<br>
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2004-10-25 17:52:26 +02:00
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</li>
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2005-09-23 02:12:12 +02:00
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</ol>
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New Features:<br>
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<ol>
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2004-10-25 17:52:26 +02:00
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<li>
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2005-09-23 02:12:12 +02:00
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A 'loose' provider option has been added. If you wish to be
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able to use marking to specify the gateway used by
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connections originating on the firewall itself, the specify
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'loose' for each provider. It has bee reported that 'loose'
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may break the effect of 'track' so beware if you need
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'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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2004-10-25 17:52:26 +02:00
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<br>
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2005-09-23 02:12:12 +02:00
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To use 'loose', you also need to add two entries in
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/etc/shorewall/masq:<br>
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2005-09-23 02:56:29 +02:00
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2005-09-23 02:12:12 +02:00
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<pre>
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<span style=
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"font-family: monospace;">#INTERFACE SUBNET ADDRESS<br>
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$IF_ISP1 $IP_ISP2 $IP_ISP1<br>
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$IF_ISP2 $IP_ISP1 $IP_ISP2</span>
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</pre>
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where:<br>
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2005-09-23 02:56:29 +02:00
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2005-09-23 02:12:12 +02:00
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<pre>
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$IF_ISP1 is the interface to ISP 1.<br>
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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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</pre>
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2004-10-25 17:52:26 +02:00
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</li>
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2005-09-23 02:12:12 +02:00
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<li>/sbin/shorewall now issues a warning each time that it
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finds that startup is disabled.</li>
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<li>A new COPY column has been added to the
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/etc/shorewall/providers file. Normally, when a table
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name/number is given in the DUPLICATE column, the entire
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table (less default routes) is copied. The COPY column allows
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you to limit the routes copied to those that go through an
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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
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the new table created will contain those routes through the
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interfaces eth0, eth1 and eth2.<br>
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2004-10-25 17:52:26 +02:00
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</li>
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2005-09-23 02:12:12 +02:00
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</ol>
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2005-09-23 02:56:29 +02:00
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2005-09-23 02:12:12 +02:00
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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
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Security 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
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all supported stable versions of Shorewall. This
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vulnerability enables a client accepted by MAC address
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filtering to bypass any other rule. If MACLIST_TTL is set
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to a value greater than 0 or MACLIST_DISPOSITION is set to
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"ACCEPT" in /etc/shorewall/shorewall.conf (default is
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MACLIST_TTL=0 and MACLIST_DISPOSITION=REJECT), and a client is
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positively identified through its MAC address, it bypasses all
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other policies/rules in place, thus gaining access to all open
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services on 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
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/etc/shorewall/shorewall.conf. For Shorewall 2.0.x, set
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MACLIST_DISPOSITION=REJECT in
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/etc/shorewall/shorewall.conf. MACLIST filtering is of
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limited value on Internet-connected hosts, and the Shorewall
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team recommends 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'
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script is available at: <a href=
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"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 href=
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"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 href=
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"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'
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script is available at: <a href=
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"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 href=
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"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 href=
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"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'
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script is available at: <a href=
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"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 href=
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"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>
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and <a href=
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"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
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the fixed files. Only the most recent version of the
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2.0.x and 2.2.x streams will be supported by the development
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team, and the 1.x branches are no longer maintained at
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all. Future releases of Shorewall will include this
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fix.</p>
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<p>This information was based on <a href=
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"http://seclists.org/lists/fulldisclosure/2005/Jul/0409.html">Patrick
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Blitz's post to the Full Disclosure mailing list</a>.
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Thanks to Supernaut (supernaut at ns dot sympatico dot ca) for
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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
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Shorewall 2.2.6.<br>
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</p>
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<hr style="width: 100%; height: 2px;">
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<span style="font-weight: bold;">07/13/2005 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
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reflect recent IANA allocations.</li>
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<li>Shorewall now detects an error where multiple providers
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specify the 'track' option on the same interface.</li>
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|
|
|
|
|
<li>The remnants of the GATEWAY column in
|
|
|
|
|
/etc/shorewall/interfaces have been removed. This column
|
|
|
|
|
appeared briefly in one of the Beta versions and was
|
|
|
|
|
immediately removed but some vestiges remained.</li>
|
|
|
|
|
|
|
|
|
|
<li>Shorewall now correctly restores a load-balancing default
|
|
|
|
|
route during processing of the 'shorewall restore' and
|
|
|
|
|
'shorewall -f start' commands. The latter command is normally
|
|
|
|
|
executed by the Shorewall init script during reboot.</li>
|
|
|
|
|
|
|
|
|
|
<li>A log level of "None!" is now allowed on builtin actions
|
|
|
|
|
such as ACCEPT and DROP.</li>
|
|
|
|
|
|
|
|
|
|
<li>Previously, LIMIT:BURST parameters in
|
|
|
|
|
/etc/shorewall/policy were not correctly applied when the
|
|
|
|
|
policy was QUEUE.</li>
|
|
|
|
|
|
|
|
|
|
<li>The 'chkconfig' command on FC4 and Mandriva previously
|
|
|
|
|
created symbolic links with incorrect names ("S-1shorewall").
|
|
|
|
|
The init script has been changed to prevent this incorrect
|
|
|
|
|
behavior.</li>
|
|
|
|
|
|
|
|
|
|
<li>DHCP traffic forwarded through a bridge could, under some
|
|
|
|
|
configurations, be filtered by the 'maclist' option even
|
|
|
|
|
though the 'dhcp' option was specified. This has been
|
|
|
|
|
corrected.<br>
|
2004-10-25 17:52:26 +02:00
|
|
|
</li>
|
2005-09-23 02:12:12 +02:00
|
|
|
</ol>
|
|
|
|
|
<span style="font-weight: bold;">06/05/2005 Shorewall 2.4.0<br>
|
2004-10-25 17:52:26 +02:00
|
|
|
<br>
|
2005-09-23 02:12:12 +02:00
|
|
|
Note:</span> Because of the short time that has elapsed since
|
|
|
|
|
the release of Shorewall 2.2.0, Shorewall 2.0 will be supported
|
|
|
|
|
until 1 December 2005 or until the release of Shorewall 2.6.0,
|
|
|
|
|
whichever occurs first.<br>
|
2004-10-25 17:52:26 +02:00
|
|
|
<br>
|
2005-09-23 02:12:12 +02:00
|
|
|
New Features:<br>
|
|
|
|
|
|
2004-10-25 17:52:26 +02:00
|
|
|
<ol>
|
2005-09-23 02:12:12 +02:00
|
|
|
<li>Shorewall 2.4.0 includes support for multiple internet
|
|
|
|
|
interfaces 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>
|
2004-10-25 17:52:26 +02:00
|
|
|
</li>
|
2005-09-23 02:12:12 +02:00
|
|
|
|
|
|
|
|
<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 --to 31<br>
|
|
|
|
|
ipset -A SMTP 25<br>
|
|
|
|
|
<br>
|
|
|
|
|
ipset -A Blacklist
|
|
|
|
|
206.124.146.177<br>
|
|
|
|
|
ipset -B Blacklist
|
|
|
|
|
206.124.146.177 -b SMTP<br>
|
|
|
|
|
<br>
|
|
|
|
|
Now only port 25 will be blocked from 206.124.146.177.<br>
|
|
|
|
|
<br>
|
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
<li>Shorewall 2.4.0 can now configure routing if your kernel
|
|
|
|
|
and iptables support the ROUTE target extension. This
|
|
|
|
|
extension is available in Patch-O-Matic-ng. This feature is
|
|
|
|
|
*EXPERIMENTAL* since the Netfilter team have no intention of
|
|
|
|
|
ever releasing the ROUTE target extension to kernel.org.<br>
|
|
|
|
|
<br>
|
|
|
|
|
Routing is configured using the /etc/shorewall/routes file.
|
|
|
|
|
Columns in the file are as follows:<br>
|
|
|
|
|
<br>
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
SOURCE
|
|
|
|
|
Source of the packet. May be any of the</span> <span style=
|
|
|
|
|
"font-family: monospace;">following:</span><br style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
- A host or network address</span><br style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
- A network interface name.</span><br style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
- The name of an ipset prefaced with "+"</span><br style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
- $FW (for packets originating on the firewall)</span><br
|
|
|
|
|
style="font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
- A MAC address in Shorewall format</span><br style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
- A range of IP addresses (assuming that your</span> <span
|
|
|
|
|
style="font-family: monospace;">kernel and iptables support
|
|
|
|
|
range match)</span><br style="font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
- A network interface name followed by ":"</span> <span
|
|
|
|
|
style="font-family: monospace;">and an address or address
|
|
|
|
|
range.</span><br style="font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
DEST
|
|
|
|
|
Destination of the packet. May be any of the</span> <span
|
|
|
|
|
style="font-family: monospace;">following:</span><br style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
- A host or network address</span><br style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
- A network interface name (determined from</span><br style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
routing table(s))</span><br style="font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
- The name of an ipset prefaced with "+"</span><br style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
- A network interface name followed by ":"</span><br style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
and an address or address range.</span><br style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
<br style="font-family: monospace;">
|
|
|
|
|
<span style=
|
|
|
|
|
"font-family: monospace;">
|
|
|
|
|
PROTO
|
|
|
|
|
Protocol - Must be "tcp", "udp", "icmp",</span> <span style=
|
|
|
|
|
"font-family: monospace;">"ipp2p", a number, or "all".
|
|
|
|
|
"ipp2p" requires</span><span style=
|
|
|
|
|
"font-family: monospace;"><br>
|
|
|
|
|
|
|
|
|
|
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
|
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|
hosts listed in /etc/shorewall/routestopped.<br>
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|
<br>
|
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|
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|
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
|
|
|
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|
entry, it is unnecessary to also specify 'routeback'.<br>
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|
<br>
|
|
|
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|
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>
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|
<br>
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</li>
|
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|
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|
<li>This change was implemented by Lorenzo Martignoni. It
|
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|
provides two new commands: "safe-start" and
|
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|
|
"safe-restart".<br>
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|
|
<br>
|
|
|
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|
<span style="font-weight: bold;">safe-start</span> starts
|
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|
Shorewall then prompts you to ask you if everything looks ok.
|
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|
|
If you answer "no" or if you don't answer within 60 seconds,
|
|
|
|
|
a "shorewall clear" is executed.<br>
|
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|
<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>
|
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|
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|
<br>
|
|
|
|
|
These new commands require either that your /bin/sh supports
|
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|
|
|
the "-t" option to the 'read' command or that you have
|
|
|
|
|
/bin/bash installed.<br>
|
2004-10-25 17:52:26 +02:00
|
|
|
</li>
|
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|
</ol>
|
2005-09-23 02:56:29 +02:00
|
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|
<span style="font-weight: bold;">Old News <a href="oldnews.html">here</a><br></span>
|
2005-09-23 02:12:12 +02:00
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</body>
|
2003-12-30 02:19:52 +01:00
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</html>
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2005-09-23 02:12:12 +02:00
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