forked from extern/shorewall_code
16906234c8
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@535 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
438 lines
20 KiB
HTML
Executable File
438 lines
20 KiB
HTML
Executable File
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type"
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content="text/html; charset=windows-1252">
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<title>Upgrade Issues</title>
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<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
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<meta name="ProgId" content="FrontPage.Editor.Document">
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<meta name="Microsoft Theme" content="none">
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0"
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style="border-collapse: collapse;" width="100%" id="AutoNumber1"
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bgcolor="#400169" height="90">
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<tbody>
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<tr>
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<td width="100%">
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<h1 align="center"><font color="#ffffff">Upgrade Issues</font></h1>
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</td>
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</tr>
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</tbody>
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</table>
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<p>For upgrade instructions see the <a
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href="Install.htm">Install/Upgrade page</a>.<br>
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</p>
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<p>It is important that you read all of the sections on this page where the
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version number mentioned in the section title is later than what you are
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currently running.<br>
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</p>
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<p> In the descriptions that follows, the term <b><i>group </i></b>refers
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to a particular network or subnetwork (which may be 0.0.0.0/0 or it may
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be a host address) accessed through a particular interface.<br>
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</p>
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<p>Examples:<br>
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<br>
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eth0:0.0.0.0/0<br>
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eth2:192.168.1.0/24<br>
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eth3:192.0.2.123<br>
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</p>
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<h3> </h3>
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<h3>Version >= 1.4.2</h3>
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There are some cases where you may want to handle traffic from a particular
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group to itself. While I personally think that such a setups are ridiculous,
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there are two cases covered in this documentation where it can occur:<br>
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<ol>
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<li><a href="FAQ.htm#faq2">In FAQ #2</a>.</li>
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<li><a href="Shorewall_Squid_Usage.html">When running Squid as a transparent
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proxy in your local zone.</a></li>
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</ol>
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If you have either of these cases, you will want to review the current documentation
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and change your configuration accordingly.<br>
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<h3>Version >= 1.4.1</h3>
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You can use the "shorewall check" command to see the groups associated with
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each of your zones.<br>
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<br>
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<ul>
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<li>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 applied
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followed by enforcement of the appropriate policy. With 1.4.1 and later
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versions, unless you have explicit rules for traffic from Z to Z or you
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have an explicit Z to Z policy (where "Z" is some zone) then traffic between
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the groups in zone Z will be accepted. If you do have one or more explicit
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rules for Z to Z or if you have an explicit Z to Z policy then the behavior
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is as it was in prior versions.</li>
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</ul>
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<blockquote>
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<ol>
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<li>If you have a Z Z ACCEPT policy for a zone to allow traffic between
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two interfaces to the same zone, that policy can be removed and traffic
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between the interfaces will traverse fewer rules than previously.</li>
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<li>If you have a Z Z DROP or Z Z REJECT policy or you have Z->Z
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rules then your configuration should not require any change.</li>
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<li>If you are currently relying on a implicit policy (one that has
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"all" in either the SOURCE or DESTINATION column) to prevent traffic between
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two interfaces to a zone Z and you have no rules for Z->Z then you should
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add an explicit DROP or REJECT policy for Z to Z.<br>
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</li>
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</ol>
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</blockquote>
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<ul>
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<li>Beginning with Version 1.4.1, Shorewall will never create rules
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to deal with traffic from a given group back to itself. The <i>multi</i>
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interface option is no longer available so if you want to route traffic between
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two subnetworks on the same interface then either:</li>
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</ul>
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<blockquote>
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<ol>
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<li>The subnetworks must be in different zones; or</li>
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<li>You must use the /etc/shorewall/hosts file to define the subnetworks
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as two groups in a single zone.</li>
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</ol>
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</blockquote>
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If you use the technique described in FAQ 2 to send local requests addressed
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to your firewall's external address back to a local server then you need to
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change your configuration to match <a href="FAQ.htm#faq2">the new version
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of FAQ #2.<br>
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</a><br>
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Example 1 -- Two zones:<br>
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<blockquote>
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<pre>/etc/shorewall/zones<br><br>z1 Zone1 The first Zone<br>z2 Zone2 The secont Zone<br><br>/etc/shorewall/policy<br><br>z1 z2 ACCEPT<br>z2 z1 ACCEPT<br><br>/etc/shorewall/interfaces<br><br>- eth1 192.168.1.255,192.168.2.255<br><br>/etc/shorewall/hosts<br><br>z1 eth1:192.168.1.0/24<br>z2 eth1:192.168.2.0/24<br></pre>
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</blockquote>
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Example 2 -- One zone:
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<blockquote>
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<pre><br>/etc/shorewall/zones<br><br>z Zone The Zone<br><br>/etc/shorewall/interfaces<br><br>- eth1 192.168.1.255,192.168.2.255<br><br>/etc/shorewall/hosts<br><br>z eth1:192.168.1.0/24<br>z eth1:192.168.2.0/24<br></pre>
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</blockquote>
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Note that in the second example, we don't need any policy since z->z
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traffic is accepted by default. The second technique is preferable if you
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want unlimited access between the two subnetworks.<br>
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<br>
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Sometimes, you want two separate zones on one interface but you don't
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want Shorewall to set up any infrastructure to handle traffic between them.
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<br>
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<br>
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Example:<br>
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<blockquote>
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<pre>/etc/shorewall/zones<br><br>z1 Zone1 The first Zone<br>z2 Zone2 The secont Zone<br><br>/etc/shorewall/interfaces<br><br>z2 eth1 192.168.1.255<br><br>/etc/shorewall/hosts<br><br>z1 eth1:192.168.1.3<br></pre>
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</blockquote>
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Here, zone z1 is nested in zone z2 and the firewall is not going to be
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involved in any traffic between these two zones. Beginning with Shorewall
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1.4.1, you can prevent Shorewall from setting up any infrastructure to handle
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traffic between z1 and z2 by using the new NONE policy:<br>
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<blockquote>
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<pre>/etc/shorewall/policy<br><pre>z1 z2 NONE<br>z2 z1 NONE</pre></pre>
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</blockquote>
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Note that NONE policies are generally used in pairs unless there is asymetric
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routing where only the traffic on one direction flows through the firewall
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and you are using a NONE polciy in the other direction.
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<h3>Version >= 1.4.0</h3>
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<b>IMPORTANT: Shorewall >=1.4.0 </b><b>requires</b> <b>the iproute
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package ('ip' utility).</b><br>
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<br>
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<b>Note: </b>Unfortunately, some distributions call this package iproute2
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which will cause the upgrade of Shorewall to fail with the diagnostic:<br>
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<br>
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error: failed dependencies:iproute is needed by shorewall-1.4.0-1
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<br>
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<br>
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This may be worked around by using the --nodeps option of rpm (rpm
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-Uvh --nodeps <shorewall rpm>).<br>
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<br>
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If you are upgrading from a version < 1.4.0, then:<br>
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<ul>
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<li>The <b>noping </b>and <b>forwardping</b> interface options
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are no longer supported nor is the <b>FORWARDPING </b>option in shorewall.conf.
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ICMP echo-request (ping) packets are treated just like any other connection
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request and are subject to rules and policies.</li>
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<li>Interface names of the form <device>:<integer>
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in /etc/shorewall/interfaces now generate a Shorewall error at startup
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(they always have produced warnings in iptables).</li>
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<li>The MERGE_HOSTS variable has been removed from shorewall.conf.
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Shorewall 1.4 behaves like 1.3 did when MERGE_HOSTS=Yes; that is zone
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contents are determined by BOTH the interfaces and hosts files when there
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are entries for the zone in both files.</li>
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<li>The <b>routestopped</b> option in the interfaces and hosts
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file has been eliminated; use entries in the routestopped file instead.</li>
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<li>The Shorewall 1.2 syntax for DNAT and REDIRECT rules is
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no longer accepted; you must convert to using the new syntax.</li>
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<li value="6">The ALLOWRELATED variable in shorewall.conf is
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no longer supported. Shorewall 1.4 behavior is the same as 1.3 with ALLOWRELATED=Yes.</li>
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<li value="6">Late-arriving DNS replies are now dropped by default;
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there is no need for your own /etc/shorewall/common file simply to avoid
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logging these packets.</li>
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<li value="6">The 'firewall', 'functions' and 'version' file
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have been moved to /usr/share/shorewall.</li>
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<li value="6">The icmp.def file has been removed. If you include
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it from /etc/shorewall/icmpdef, you will need to modify that file.</li>
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<ul>
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</ul>
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<li>If you followed the advice in FAQ #2 and call find_interface_address
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in /etc/shorewall/params, that code should be moved to /etc/shorewall/init.<br>
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</li>
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</ul>
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<ul>
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</ul>
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<h3>Version 1.4.0</h3>
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<ul>
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<li value="8">The 'multi' interface option is no longer supported.
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Shorewall will generate rules for sending packets back out the same
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interface that they arrived on in two cases:</li>
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</ul>
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<blockquote>
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<ul>
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<li>There is an <u>explicit</u> policy for the source zone to or
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from the destination zone. An explicit policy names both zones and does
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not use the 'all' reserved word.</li>
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</ul>
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<ul>
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<li>There are one or more rules for traffic for the source zone to
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or from the destination zone including rules that use the 'all' reserved
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word. Exception: if the source zone and destination zone are the same
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then the rule must be explicit - it must name the zone in both the SOURCE
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and DESTINATION columns.</li>
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</ul>
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</blockquote>
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<h3>Version >= 1.3.14</h3>
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<img src="images/BD21298_3.gif" alt="" width="13"
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height="13">
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Beginning in version 1.3.14, Shorewall treats entries in
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<a href="Documentation.htm#Masq">/etc/shorewall/masq </a>differently. The
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change involves entries with an <b>interface name</b> in the <b>SUBNET</b>
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(second) <b>column</b>:<br>
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<ul>
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<li>Prior to 1.3.14, Shorewall would detect the FIRST subnet
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on the interface (as shown by "ip addr show <i>interface</i>") and would
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masquerade traffic from that subnet. Any other subnets that routed through
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eth1 needed their own entry in /etc/shorewall/masq to be masqueraded
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or to have SNAT applied.</li>
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<li>Beginning with Shorewall 1.3.14, Shorewall uses the firewall's
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routing table to determine ALL subnets routed through the named interface.
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Traffic originating in ANY of those subnets is masqueraded or has SNAT
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applied.</li>
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</ul>
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You will need to make a change to your configuration if:<br>
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<ol>
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<li>You have one or more entries in /etc/shorewall/masq with
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an interface name in the SUBNET (second) column; and</li>
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<li>That interface connects to more than one subnetwork.</li>
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</ol>
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Two examples:<br>
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<br>
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<b>Example 1</b> -- Suppose that your current config is as
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follows:<br>
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<br>
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<pre> [root@gateway test]# cat /etc/shorewall/masq<br> #INTERFACE SUBNET ADDRESS<br> eth0 eth2 206.124.146.176<br> eth0 192.168.10.0/24 206.124.146.176<br> #LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE<br> [root@gateway test]# ip route show dev eth2<br> 192.168.1.0/24 scope link<br> 192.168.10.0/24 proto kernel scope link src 192.168.10.254<br> [root@gateway test]#</pre>
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<blockquote>In this case, the second entry in /etc/shorewall/masq is no longer
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required.<br>
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</blockquote>
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<b>Example 2</b>-- What if your current configuration is like
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this?<br>
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<pre> [root@gateway test]# cat /etc/shorewall/masq <br> #INTERFACE SUBNET ADDRESS <br> eth0 eth2 206.124.146.176<br> #LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE <br> [root@gateway test]# ip route show dev eth2 <br> 192.168.1.0/24 scope link<br> 192.168.10.0/24 proto kernel scope link src 192.168.10.254 <br> [root@gateway test]#</pre>
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<blockquote>In this case, you would want to change the entry in /etc/shorewall/masq
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to:<br>
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</blockquote>
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<pre> #INTERFACE SUBNET ADDRESS <br> eth0 192.168.1.0/24 206.124.146.176<br> #LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE</pre>
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<img src="images/BD21298_3.gif" alt="" width="13"
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height="13">
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Version 1.3.14 also introduced simplified ICMP echo-request
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(ping) handling. The option OLD_PING_HANDLING=Yes in /etc/shorewall/shorewall.conf
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is used to specify that the old (pre-1.3.14) ping handling is to be
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used (If the option is not set in your /etc/shorewall/shorewall.conf
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then OLD_PING_HANDLING=Yes is assumed). I don't plan on supporting the
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old handling indefinitely so I urge current users to migrate to using
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the new handling as soon as possible. See the <a href="ping.html">'Ping'
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handling documentation</a> for details.<br>
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<h3>Version 1.3.10</h3>
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If you have installed the 1.3.10 Beta 1 RPM and are now upgrading
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to version 1.3.10, you will need to use the '--force' option:<br>
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<br>
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<blockquote>
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<pre>rpm -Uvh --force shorewall-1.3.10-1.noarch.rpm </pre>
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</blockquote>
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<h3>Version >= 1.3.9</h3>
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The 'functions' file has moved to /usr/lib/shorewall/functions.
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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 location.<br>
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<h3>Version >= 1.3.8</h3>
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<p>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
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your firewall setup slightly under Shorewall
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versions >= 1.3.8. Beginning with version 1.3.8,
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you must set NEWNOTSYN=Yes in your
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/etc/shorewall/shorewall.conf file.</p>
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<h3>Version >= 1.3.7</h3>
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<p>Users specifying ALLOWRELATED=No in /etc/shorewall.conf
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will need to include the following
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rules in their /etc/shorewall/icmpdef file (creating this
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file if necessary):</p>
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<pre> run_iptables -A icmpdef -p ICMP --icmp-type echo-reply -j ACCEPT<br> run_iptables -A icmpdef -p ICMP --icmp-type source-quench -j ACCEPT<br> run_iptables -A icmpdef -p ICMP --icmp-type destination-unreachable -j ACCEPT<br> run_iptables -A icmpdef -p ICMP --icmp-type time-exceeded -j ACCEPT<br> run_iptables -A icmpdef -p ICMP --icmp-type parameter-problem -j ACCEPT</pre>
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<p>Users having an /etc/shorewall/icmpdef file may remove the ". /etc/shorewall/icmp.def"
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command from that file since the icmp.def file is now empty.</p>
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<h3><b><a name="Bering">Upgrading </a>Bering to Shorewall >= 1.3.3</b></h3>
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<p>To properly upgrade with Shorewall version 1.3.3 and later:</p>
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<ol>
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<li>Be sure you have a
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backup -- you will need to transcribe
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any Shorewall configuration changes
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that you have made to the new configuration.</li>
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<li>Replace the shorwall.lrp
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package provided on the Bering floppy
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with the later one. If you did not
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obtain the later version from Jacques's site, see additional instructions
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below.</li>
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<li>Edit the /var/lib/lrpkg/root.exclude.list
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file and remove the /var/lib/shorewall
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entry if present. Then do not forget
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to backup root.lrp !</li>
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</ol>
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<p>The .lrp that I release isn't set up for a two-interface firewall like
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Jacques's. You need to follow the <a href="two-interface.htm">instructions
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for setting up a two-interface firewall</a> plus you also need
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to add the following two Bering-specific rules to /etc/shorewall/rules:</p>
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<blockquote>
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<pre># Bering specific rules:<br># allow loc to fw udp/53 for dnscache to work<br># allow loc to fw tcp/80 for weblet to work<br>#<br>ACCEPT loc fw udp 53<br>ACCEPT loc fw tcp 80</pre>
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</blockquote>
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<h3 align="left">Version 1.3.6 and 1.3.7</h3>
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<p align="left">If you have a pair of firewall systems configured for
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failover or if you have asymmetric routing, you will need to modify
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your firewall setup slightly under Shorewall versions 1.3.6
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and 1.3.7</p>
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<ol>
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<li>
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<p align="left">Create the file /etc/shorewall/newnotsyn and in it add
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the following rule<br>
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<br>
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<font face="Courier">run_iptables -A newnotsyn
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-j RETURN # So that the connection tracking table can be
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rebuilt<br>
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# from
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non-SYN packets after takeover.<br>
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</font> </p>
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</li>
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<li>
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<p align="left">Create /etc/shorewall/common (if you don't already
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have that file) and include the following:<br>
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<br>
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<font face="Courier">run_iptables -A common
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-p tcp --tcp-flags ACK,FIN,RST ACK -j ACCEPT #Accept Acks
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to rebuild connection<br>
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#tracking table. <br>
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. /etc/shorewall/common.def</font> </p>
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</li>
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</ol>
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<h3 align="left">Versions >= 1.3.5</h3>
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<p align="left">Some forms of pre-1.3.0 rules file syntax are no longer
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supported. </p>
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<p align="left">Example 1:</p>
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<div align="left">
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<pre> ACCEPT net loc:192.168.1.12:22 tcp 11111 - all</pre>
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</div>
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<p align="left">Must be replaced with:</p>
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<div align="left">
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<pre> DNAT net loc:192.168.1.12:22 tcp 11111</pre>
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</div>
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<div align="left">
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<p align="left">Example 2:</p>
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</div>
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<div align="left">
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<pre> ACCEPT loc fw::3128 tcp 80 - all</pre>
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</div>
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<div align="left">
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<p align="left">Must be replaced with:</p>
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</div>
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|
||
<div align="left">
|
||
<pre> REDIRECT loc 3128 tcp 80</pre>
|
||
</div>
|
||
|
||
<h3 align="left">Version >= 1.3.2</h3>
|
||
|
||
<p align="left">The functions and versions files together with the 'firewall'
|
||
symbolic link have moved from /etc/shorewall to /var/lib/shorewall.
|
||
If you have applications that access these files, those applications
|
||
should be modified accordingly.</p>
|
||
|
||
<p><font size="2"> Last updated 4/7/2003 - <a href="support.htm">Tom Eastep</a></font>
|
||
</p>
|
||
|
||
<p><font face="Trebuchet MS"><a href="copyright.htm"><font size="2">Copyright</font>
|
||
© <font size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a></font><br>
|
||
</p>
|
||
<br>
|
||
</body>
|
||
</html>
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