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523 lines
24 KiB
XML
523 lines
24 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- $Id$ -->
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<article id="upgrade_issues">
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<!--$Id$-->
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<articleinfo>
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<title>Upgrade Issues</title>
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<author>
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<firstname>Tom</firstname>
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<surname>Eastep</surname>
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</author>
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<pubdate>2003/12/23</pubdate>
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<copyright>
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<year>2003</year>
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<holder>Thomas M. Eastep</holder>
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</copyright>
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<legalnotice>
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<para>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; with
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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
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<quote><ulink url="GnuCopyright.htm">GNU Free Documentation License</ulink></quote>.</para>
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</legalnotice>
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</articleinfo>
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<section>
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<title>Important</title>
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<para>It is important that you read all of the sections on this page where
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the version number mentioned in the section title is later than what you
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are currently running.</para>
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<para>In the descriptions that follows, the term <emphasis>group</emphasis>
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refers to a particular network or subnetwork (which may be
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<literal>0.0.0.0/0</literal> or it may be a host address) accessed through
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a particular interface.</para>
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<para>Examples:</para>
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<simplelist columns="1" type="vert">
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<member><literal>eth0:0.0.0.0/0</literal></member>
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<member><literal>eth2:192.168.1.0/24</literal></member>
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<member><literal>eth3:192.0.2.123</literal></member>
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</simplelist>
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<para>You can use the <command moreinfo="none">shorewall check</command>
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command to see the groups associated with each of your zones.</para>
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</section>
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<section>
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<title>Version >= 1.4.8</title>
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<itemizedlist mark="bullet">
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<listitem>
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<para>The meaning of <varname>ROUTE_FILTER=Yes</varname> has changed.
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Previously this setting was documented as causing route filtering to
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occur on all network interfaces; this didn't work. Beginning with
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this release, <varname>ROUTE_FILTER=Yes</varname> causes route
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filtering to occur on all interfaces brought up while Shorewall is
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running. This means that it may be appropriate to set
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<varname>ROUTE_FILTER=Yes</varname> and use the routefilter option in
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<filename class="directory">/etc/shorewall/</filename><filename>interfaces</filename>
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entries.</para>
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</listitem>
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</itemizedlist>
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</section>
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<section>
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<title>Version >= 1.4.6</title>
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<itemizedlist mark="bullet">
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<listitem>
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<para>The <varname>NAT_ENABLED</varname>, <varname>MANGLE_ENABLED</varname>
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and <varname>MULTIPORT</varname> options have been removed from
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<filename>shorewall.conf</filename>. These capabilities are now
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automatically detected by Shorewall.</para>
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</listitem>
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<listitem>
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<para>An undocumented feature previously allowed entries in the host
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file as follows: <synopsis>
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zone eth1:192.168.1.0/24,eth2:192.168.2.0/24
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</synopsis> This capability was never documented and has been removed in
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1.4.6 to allow entries of the following format: <synopsis>
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zone eth1:192.168.1.0/24,192.168.2.0/24
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</synopsis></para>
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</listitem>
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</itemizedlist>
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</section>
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<section>
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<title>Version >= 1.4.4</title>
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<para>If you are upgrading from 1.4.3 and have set the <varname>LOGMARKER</varname>
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variable in <filename class="directory">/etc/shorewall/</filename><filename>shorewall.conf</filename>,
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then you must set the new <varname>LOGFORMAT</varname> variable
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appropriately and remove your setting of <varname>LOGMARKER</varname>.</para>
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</section>
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<section>
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<title>Version 1.4.4</title>
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<para>If you have zone names that are 5 characters long, you may
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experience problems starting Shorewall because the <option>--log-prefix</option>
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in a logging rule is too long. Upgrade to Version 1.4.4a to fix this
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problem.</para>
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</section>
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<section>
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<title>Version >= 1.4.2</title>
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<para>There are some cases where you may want to handle traffic from a
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particular group to itself. While I personally think that such a setups
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are ridiculous, there are two cases covered in this documentation where it
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can occur: <itemizedlist><listitem><para><ulink url="FAQ.htm#faq2">In FAQ
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#2</ulink></para></listitem><listitem><para><ulink
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url="Shorewall_Squid_Usage.html">When running <application>Squid</application>
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as a transparent proxy in your local zone.</ulink></para></listitem></itemizedlist>
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If you have either of these cases, you will want to review the current
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documentation and change your configuration accordingly.</para>
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</section>
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<section>
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<title>Version >= 1.4.1</title>
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<itemizedlist mark="bullet">
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<listitem>
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<para>Beginning with Version 1.4.1, traffic between groups in the same
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zone is accepted by default. Previously, traffic from a zone to itself
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was treated just like any other traffic; any matching rules were
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applied followed by enforcement of the appropriate policy. With 1.4.1
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and later versions, unless you have explicit rules for traffic from Z
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to Z or you have an explicit Z to Z policy (where "Z" is some
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zone) then traffic between the groups in zone Z will be accepted. If
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you do have one or more explicit rules for Z to Z or if you have an
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explicit Z to Z policy then the behavior is as it was in prior
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versions.</para>
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<orderedlist numeration="arabic">
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<listitem>
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<para>If you have a Z Z ACCEPT policy for a zone to allow traffic
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between two interfaces to the same zone, that policy can be
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removed and traffic between the interfaces will traverse fewer
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rules than previously.</para>
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</listitem>
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<listitem>
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<para>If you have a Z Z DROP or Z Z REJECT policy or you have
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Z->Z rules then your configuration should not require any
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change.</para>
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</listitem>
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<listitem>
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<para>If you are currently relying on a implicit policy (one that
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has "all" in either the SOURCE or DESTINATION column) to
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prevent traffic between two interfaces to a zone Z and you have no
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rules for Z->Z then you should add an explicit DROP or REJECT
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policy for Z to Z.</para>
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</listitem>
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</orderedlist>
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</listitem>
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<listitem>
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<para>Sometimes, you want two separate zones on one interface but you
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don't want Shorewall to set up any infrastructure to handle
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traffic between them. <example><title>The <filename>zones</filename>,
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<filename>interfaces</filename> and, <filename>hosts</filename> file
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contents</title><programlisting>
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<filename class="directory">/etc/shorewall/</filename><filename>zones</filename>
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z1 Zone1 The first Zone
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z2 Zone2 The second Zone
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<filename class="directory">/etc/shorewall/</filename><filename>interfaces</filename>
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z2 eth1 192.168.1.255
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<filename class="directory">/etc/shorewall/</filename><filename>hosts</filename>
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z1 eth1:192.168.1.3
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</programlisting></example> Here, zone z1 is nested in zone z2 and the
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firewall is not going to be involved in any traffic between these two
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zones. Beginning with Shorewall 1.4.1, you can prevent Shorewall from
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setting up any infrastructure to handle traffic between z1 and z2 by
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using the new NONE policy: <example><title>The contents of
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<filename>policy</filename></title><programlisting>
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<filename class="directory">/etc/shorewall/</filename><filename>policy</filename>
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z1 z2 NONE
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z2 z1 NONE
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</programlisting></example> Note that NONE policies are generally used in
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pairs unless there is asymetric routing where only the traffic on one
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direction flows through the firewall and you are using a NONE polciy
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in the other direction.</para>
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</listitem>
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</itemizedlist>
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</section>
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<section>
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<title>Version 1.4.1</title>
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<itemizedlist mark="bullet">
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<listitem>
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<para>In Version 1.4.1, Shorewall will never create rules to deal with
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traffic from a given group back to itself. The <varname>multi</varname>
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interface option is no longer available so if you want to route
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traffic between two subnetworks on the same interface then I recommend
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that you upgrade to Version 1.4.2 and use the <varname>routeback</varname>
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interface or host option.</para>
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</listitem>
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</itemizedlist>
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</section>
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<section>
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<title>Version >= 1.4.0</title>
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<important>
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<para>Shorewall >=1.4.0 requires the <command>iproute</command>
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package ('<literal>ip</literal>' utility).</para>
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</important>
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<note>
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<para>Unfortunately, some distributions call this package
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<command>iproute2</command> which will cause the upgrade of Shorewall to
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fail with the diagnostic: <synopsis>
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error: failed dependencies:iproute is needed by shorewall-1.4.0-1
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</synopsis> This may be worked around by using the <option>--nodeps</option>
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option of <command>rpm</command> (<command>rpm -Uvh --nodeps
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<filename>your_shorewall_rpm.rpm</filename></command>).</para>
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</note>
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<para>If you are upgrading from a version < 1.4.0, then: <itemizedlist
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mark="bullet"><listitem><para>The <varname>noping</varname> and
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<varname>forwardping</varname> interface options are no longer supported
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nor is the <varname>FORWARDPING</varname> option in <filename>shorewall.conf</filename>.
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ICMP echo-request (ping) packets are treated just like any other
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connection request and are subject to rules and policies.</para></listitem><listitem><para>Interface
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names of the form <varname><device>:<integer></varname> in
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<filename class="directory">/etc/shorewall/</filename><filename>interfaces</filename>
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now generate a Shorewall error at startup (they always have produced
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warnings in <application class="software">iptables</application>).</para></listitem><listitem><para>The
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<varname>MERGE_HOSTS</varname> variable has been removed from
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<filename>shorewall.conf</filename>. Shorewall 1.4 behaves like 1.3 did
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when <varname>MERGE_HOSTS=Yes</varname>; that is zone contents are
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determined by <emphasis>BOTH</emphasis> the interfaces and hosts files
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when there are entries for the zone in both files.</para></listitem><listitem><para>The
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<varname>routestopped</varname> option in the interfaces and hosts file
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has been eliminated; use entries in the <filename>routestopped</filename>
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file instead.</para></listitem><listitem><para>The Shorewall 1.2 syntax
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for <varname>DNAT</varname> and <varname>REDIRECT</varname> rules is no
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longer accepted; you must convert to using the new syntax.</para></listitem><listitem><para>The
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<varname>ALLOWRELATED</varname> variable in <filename>shorewall.conf</filename>
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is no longer supported. Shorewall 1.4 behavior is the same as 1.3 with
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<varname>ALLOWRELATED=Yes</varname>.</para></listitem><listitem><para>Late-arriving
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DNS replies are now dropped by default; there is no need for your own
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<filename class="directory">/etc/shorewall/</filename><filename>common</filename>
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file simply to avoid logging these packets.</para></listitem><listitem><para>The
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<filename>firewall</filename>, <filename>functions</filename> and
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<filename>version</filename> files have been moved to <filename
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class="directory">/usr/share/shorewall</filename>.</para></listitem><listitem><para>The
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<filename>icmp.def</filename> file has been removed. If you include it
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from <filename class="directory">/etc/shorewall/</filename><filename>icmpdef</filename>,
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you will need to modify that file.</para></listitem><listitem><para>If you
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followed the advice in FAQ #2 and call <varname>find_interface_address</varname>
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in <filename class="directory">/etc/shorewall/</filename><filename>params</filename>,
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that code should be moved to <filename class="directory">/etc/shorewall/</filename><filename>init</filename>.</para></listitem></itemizedlist></para>
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</section>
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<section>
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<title>Version 1.4.0</title>
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<itemizedlist mark="bullet">
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<listitem>
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<para>The <varname>multi</varname> interface option is no longer
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supported. Shorewall will generate rules for sending packets back out
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the same interface that they arrived on in two cases: <itemizedlist
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mark="hollow"><listitem><para>There is an <emphasis>explicit</emphasis>
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policy for the source zone to or from the destination zone. An
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explicit policy names both zones and does not use the
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<varname>all</varname> reserved word.</para></listitem><listitem><para>There
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are one or more rules for traffic for the source zone to or from the
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destination zone including rules that use the <varname>all</varname>
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reserved word. Exception: if the source zone and destination zone are
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the same then the rule must be explicit - it must name the zone in
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both the <varname>SOURCE</varname> and <varname>DESTINATION</varname>
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columns.</para></listitem></itemizedlist></para>
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</listitem>
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</itemizedlist>
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</section>
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<section>
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<title>Version >= 1.3.14</title>
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<para>Beginning in version 1.3.14, Shorewall treats entries in <filename
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class="directory">/etc/shorewall/</filename><filename>masq</filename>
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differently. The change involves entries with an <emphasis role="bold">interface
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name</emphasis> in the <varname>SUBNET</varname> (second) <emphasis
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role="bold">column</emphasis>: <itemizedlist mark="bullet"><listitem><para>Prior
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to 1.3.14, Shorewall would detect the FIRST subnet on the interface (as
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shown by <quote>ip addr show interface</quote>) and would masquerade
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traffic from that subnet. Any other subnets that routed through
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<literal>eth1</literal> needed their own entry in <filename
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class="directory">/etc/shorewall/</filename><filename>masq</filename> to
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be masqueraded or to have <acronym>SNAT</acronym> applied.</para></listitem><listitem><para>Beginning
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with Shorewall 1.3.14, Shorewall uses the firewall's routing table to
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determine ALL subnets routed through the named interface. Traffic
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originating in ANY of those subnets is masqueraded or has SNAT applied.</para></listitem></itemizedlist>
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You will need to make a change to your configuration if: <orderedlist
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numeration="arabic"><listitem><para>You have one or more entries in
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<filename class="directory">/etc/shorewall/</filename><filename>masq</filename>
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with an interface name in the <varname>SUBNET</varname> (second) column;
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and</para></listitem><listitem><para>That interface connects to more than
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one subnetwork.</para></listitem></orderedlist> Two examples: <example
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label="1"><title>Suppose that your current config is as follows:</title><programlisting>
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<!-- I added a space below the end of the config file for clarity -->
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[root@gateway test]# cat /etc/shorewall/masq
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#INTERFACE SUBNET ADDRESS
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eth0 eth2 206.124.146.176
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eth0 192.168.10.0/24 206.124.146.176
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#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE
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[root@gateway test]# ip route show dev eth2
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192.168.1.0/24 scope link
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192.168.10.0/24 proto kernel scope link src 192.168.10.254
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[root@gateway test]#
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</programlisting></example> In this case, the second entry in <filename
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class="directory">/etc/shorewall/</filename><filename>masq</filename> is
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no longer required. <example label="2"><title>What if your current
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configuration is like this?</title><programlisting>
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[root@gateway test]# cat /etc/shorewall/masq
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#INTERFACE SUBNET ADDRESS
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eth0 eth2 206.124.146.176
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#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE
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[root@gateway test]# ip route show dev eth2
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192.168.1.0/24 scope link
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192.168.10.0/24 proto kernel scope link src 192.168.10.254
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[root@gateway test]#
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</programlisting></example> In this case, you would want to change the
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entry in /etc/shorewall/masq to: <programlisting>
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#INTERFACE SUBNET ADDRESS
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eth0 192.168.1.0/24 206.124.146.176
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#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE
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</programlisting> Version 1.3.14 also introduced simplified ICMP
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echo-request (ping) handling. The option <varname>OLD_PING_HANDLING=Yes</varname>
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in <filename class="directory">/etc/shorewall/</filename><filename>shorewall.conf</filename>
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is used to specify that the old (pre-1.3.14) ping handling is to be used
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(If the option is not set in your <filename class="directory">/etc/shorewall/</filename>shorewall.conf
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then <varname>OLD_PING_HANDLING=Yes</varname> is assumed). I don't
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plan on supporting the old handling indefinitely so I urge current users
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to migrate to using the new handling as soon as possible. See the
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'Ping' handling documentation for details.</para>
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</section>
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<section>
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<title>Version 1.3.10</title>
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<itemizedlist mark="bullet">
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<listitem>
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<para>If you have installed the 1.3.10 Beta 1 RPM and are now
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upgrading to version 1.3.10, you will need to use the
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<option>--force</option> option: <programlisting>
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rpm -Uvh --force shorewall-1.3.10-1.noarch.rpm
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</programlisting></para>
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</listitem>
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</itemizedlist>
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</section>
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<section>
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<title>Version >= 1.3.9</title>
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<itemizedlist>
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<listitem>
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<para>The <filename>functions</filename> file has moved to <filename
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class="directory">/usr/lib/shorewall/</filename><filename>functions</filename>.
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If you have an application that uses functions from that file, your
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application will need to be changed to reflect this change of
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location.</para>
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</listitem>
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</itemizedlist>
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</section>
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<section>
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<title>Version >= 1.3.8</title>
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<itemizedlist>
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<listitem>
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<para>If you have a pair of firewall systems configured for failover
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or if you have asymmetric routing, you will need to modify your
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firewall setup slightly under Shorewall versions >= 1.3.8.
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Beginning with version 1.3.8, you must set <varname>NEWNOTSYN=Yes</varname>
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in your <filename class="directory">/etc/shorewall/</filename><filename>shorewall.conf</filename>
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file.</para>
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</listitem>
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</itemizedlist>
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</section>
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<section>
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<title>Version >= 1.3.7</title>
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<itemizedlist>
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<listitem>
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<para>Users specifying <varname>ALLOWRELATED=No</varname> in <filename
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class="directory">/etc/</filename><filename>shorewall.conf</filename>
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will need to include the following rules in their <filename
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class="directory">/etc/shorewall/</filename><filename>icmpdef</filename>
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file (creating this file if necessary):
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<programlisting>
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run_iptables -A icmpdef -p ICMP --icmp-type echo-reply -j ACCEPT
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run_iptables -A icmpdef -p ICMP --icmp-type source-quench -j ACCEPT
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run_iptables -A icmpdef -p ICMP --icmp-type destination-unreachable -j ACCEPT
|
|
run_iptables -A icmpdef -p ICMP --icmp-type time-exceeded -j ACCEPT
|
|
run_iptables -A icmpdef -p ICMP --icmp-type parameter-problem -j ACCEPT
|
|
</programlisting> Users having an <filename class="directory">/etc/shorewall/</filename><filename>icmpdef</filename>
|
|
file may remove the <command>./etc/shorewall/icmp.def</command>
|
|
command from that file since the <filename>icmp.def</filename> file is
|
|
now empty.</para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</section>
|
|
|
|
<section>
|
|
<title>Upgrading Bering to Shorewall >= 1.3.3</title>
|
|
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>To properly upgrade with Shorewall version 1.3.3 and later:
|
|
<orderedlist numeration="arabic"><listitem><para>Be sure you have a
|
|
backup -- you will need to transcribe any Shorewall configuration
|
|
changes that you have made to the new configuration.</para></listitem><listitem><para>Replace
|
|
the <filename>shorwall.lrp</filename> package provided on the Bering
|
|
floppy with the later one. If you did not obtain the later version
|
|
from Jacques's site, see additional instructions below.</para></listitem><listitem><para>Edit
|
|
the <filename class="directory">/var/lib/lrpkg/</filename><filename>root.exclude.list</filename>
|
|
file and remove the <filename>/var/lib/shorewall</filename> entry if
|
|
present. Then do not forget to backup <filename>root.lrp</filename>!</para></listitem></orderedlist>
|
|
The .lrp that I release isn't set up for a two-interface firewall
|
|
like Jacques's. You need to follow the instructions for setting up
|
|
a two-interface firewall plus you also need to add the following two
|
|
Bering-specific rules to <filename class="directory">/etc/shorewall/</filename><filename>rules</filename>:
|
|
<programlisting>
|
|
# Bering specific rules:
|
|
# allow loc to fw udp/53 for dnscache to work
|
|
# allow loc to fw tcp/80 for weblet to work
|
|
#
|
|
ACCEPT loc fw udp 53
|
|
ACCEPT loc fw tcp 80
|
|
</programlisting></para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</section>
|
|
|
|
<section>
|
|
<title>Version 1.3.6 and 1.3.7</title>
|
|
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>If you have a pair of firewall systems configured for failover
|
|
or if you have asymmetric routing, you will need to modify your
|
|
firewall setup slightly under Shorewall versions 1.3.6 and 1.3.7
|
|
<orderedlist><listitem><para>Create the file <filename
|
|
class="directory">/etc/shorewall/</filename><filename>newnotsyn</filename>
|
|
and in it add the following rule: <!-- The following code wraps off of the document. I have added the comment above the command. -->
|
|
<programlisting>
|
|
# So that the connection tracking table can be rebuilt
|
|
# from non-SYN packets after takeover.
|
|
run_iptables -A newnotsyn -j RETURN
|
|
</programlisting></para></listitem><listitem><para>Create <filename
|
|
class="directory">/etc/shorewall/</filename><filename>common</filename>
|
|
(if you don't already have that file) and include the following:
|
|
<programlisting>
|
|
#Accept Acks to rebuild connection tracking table.
|
|
run_iptables -A common -p tcp --tcp-flags ACK,FIN,RST ACK -j ACCEPT
|
|
|
|
./etc/shorewall/common.def
|
|
</programlisting></para></listitem></orderedlist></para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</section>
|
|
|
|
<section>
|
|
<title>Versions >= 1.3.5</title>
|
|
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>Some forms of pre-1.3.0 rules file syntax are no longer
|
|
supported. <example label="1"><title></title><programlisting>
|
|
ACCEPT net loc:192.168.1.12:22 tcp 11111 - all
|
|
</programlisting></example> Must be replaced with:
|
|
<programlisting>
|
|
DNAT net loc:192.168.1.12:22 tcp 11111
|
|
</programlisting> <example label="2"><title></title><programlisting>
|
|
ACCEPT loc fw::3128 tcp 80 - all
|
|
</programlisting></example> Must be replaced with:
|
|
<programlisting>
|
|
REDIRECT loc 3128 tcp 80
|
|
</programlisting></para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</section>
|
|
|
|
<section>
|
|
<title>Version >= 1.3.2</title>
|
|
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>The functions and versions files together with the <filename
|
|
class="symlink">firewall</filename> symbolic link have moved from
|
|
<filename class="directory">/etc/shorewall</filename> to <filename
|
|
class="directory">/var/lib/shorewall</filename>. If you have
|
|
applications that access these files, those applications should be
|
|
modified accordingly.</para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</section>
|
|
</article> |