Shorewall Errata

IMPORTANT

1. If you use a Windows system to download a corrected script, be sure to run the script through dos2unix after you have moved it to your Linux system.

2. If you are installing Shorewall for the first time and plan to use the .tgz and install.sh script, you can untar the archive, replace the 'firewall' script in the untarred directory with the one you downloaded below, and then run install.sh.

3. When the instructions say to install a corrected firewall script in /usr/share/shorewall/firewall, you may rename the existing file before copying in the new file.

4. DO NOT INSTALL CORRECTED COMPONENTS ON A RELEASE EARLIER THAN THE ONE THAT THEY ARE LISTED UNDER BELOW. For example, do NOT install the 1.3.9a firewall script if you are running 1.3.7c.
   

• Upgrade Issues
• Problems in Version 1.4
  
• Problems in Version 1.3
• Problems in Version 1.2
• Problems in Version 1.1
• Problem with iptables version 1.2.3 on RH7.2
• Problems with kernels >= 2.4.18 and RedHat iptables
• Problems installing/upgrading RPM on SuSE
• Problems with iptables version 1.2.7 and MULTIPORT=Yes
• Problems with RH Kernel 2.4.18-10 and NAT
• Problems with RH Kernels after 2.4.20-9 and REJECT (also applies to 2.4.21-RC1)
  

Problems in Version 1.4

1.4.8

• When a DNAT rules specifies SNAT (e.g., when <original dest addr>:<SNAT addr> is given in the ORIGINAL DEST column), the SNAT specification is effectively ignored in some cases.

1.4.7

• Using some versions of 'ash' (such as from RH8) as the SHOREWALL_SHELL causes "shorewall [re]start" to fail with:
  
     local: --limit: bad variable name
     iptables v1.2.8: Couldn't load match `-j':/lib/iptables/libipt_-j.so:
     cannot open shared object file: No such file or directory
     Try `iptables -h' or 'iptables --help' for more information.
• When more than one ICMP type is listed in a rule and your kernel includes multiport match support,  the firewall fails to start. 
• Regardless of the setting of LOGUNCLEAN, the value LOGUNCLEAN=info was used.
• After the following error message, Shorewall was left in an inconsistent state:
  Error: Unable to determine the routes through interface xxx
  
• When a DNAT rules specifies SNAT (e.g., when <original dest addr>:<SNAT addr> is given in the ORIGINAL DEST column), the SNAT specification is effectively ignored in some cases.

1.4.6

• If TC_ENABLED is set to yes in shorewall.conf then Shorewall would fail to start with the error "ERROR:  Traffic Control requires Mangle"; that problem has been corrected in this firewall script which may be installed in /use/share/shorewall/firewall as described above. This problem is also corrected in bugfix release 1.4.6a.
• This problem occurs in all versions supporting traffic control. If a MAC address is used in the SOURCE column, an error occurs as follows:
  
       iptables v1.2.8: Bad mac adress `00:08:B5:35:52:E7-d`
  
  For Shorewall 1.4.6 and 1.4.6a users, this problem has been corrected in this firewall script which may be installed in /usr/share/shorewall/firewall as described above. For all other versions, you will have to edit your 'firewall' script (in versions 1.4.*, it is located in /usr/share/shorewall/firewall). Locate the function add_tcrule_() and in that function, replace this line:
  
      r=`mac_match $source` 
  
  with
  
       r="`mac_match $source` "
  
  Note that there must be a space before the ending quote!
  

1.4.4b

• Shorewall is ignoring records in /etc/shorewall/routestopped that have an empty second column (HOSTS). This problem may be corrected by installing this firewall script in /usr/share/shorewall/firewall as described above.
• The INCLUDE directive doesn't work when placed in the /etc/shorewall/zones file. This problem may be corrected by installing this functions script in /usr/share/shorewall/functions.
  

1.4.4-1.4.4a

• Log messages are being displayed on the system console even though the log level for the console is set properly according to FAQ 16. This problem may be corrected by installing this firewall script in /usr/share/shorewall/firewall as described above.
  

1.4.4

• If you have zone names that are 5 characters long, you may experience problems starting Shorewall because the --log-prefix in a logging rule is too long. Upgrade to Version 1.4.4a to fix this problem..

1.4.3

• The LOGMARKER variable introduced in version 1.4.3 was intended to allow integration of Shorewall with Fireparse (http://www.firewparse.com). Unfortunately, LOGMARKER only solved part of the integration problem. I have implimented a new LOGFORMAT variable which will replace LOGMARKER which has completely solved this problem and is currently in production with fireparse here at shorewall.net. The updated files may be found at ftp://ftp1.shorewall.net/pub/shorewall/errata/1.4.3/fireparse/. See the 0README.txt file for details.
  

1.4.2

• When an 'add' or 'delete' command is executed, a temporary directory created in /tmp is not being removed. This problem may be corrected by installing this firewall script in /usr/share/shorewall/firewall as described above.
  

1.4.1a, 1.4.1 and 1.4.0

• Some TCP requests are rejected in the 'common' chain with an ICMP port-unreachable response rather than the more appropriate TCP RST response. This problem is corrected in this updated common.def file which may be installed in /etc/shorewall/common.def.
  

1.4.1

• When a "shorewall check" command is executed, each "rule" produces the harmless additional message:
  
       /usr/share/shorewall/firewall: line 2174: [: =: unary operator expected
  
  You may correct the problem by installing this corrected script in /usr/share/shorewall/firewall as described above.
  

1.4.0

• When running under certain shells Shorewall will attempt to create ECN rules even when /etc/shorewall/ecn is empty. You may either just remove /etc/shorewall/ecn or you can install this correct script in /usr/share/shorewall/firewall as described above.
  

Upgrade Issues

The upgrade issues have moved to a separate page.

Problem with iptables version 1.2.3

There are a couple of serious bugs in iptables 1.2.3 that prevent it from working with Shorewall. Regrettably, RedHat released this buggy iptables in RedHat 7.2. 

I have built a corrected 1.2.3 rpm which you can download here  and I have also built an iptables-1.2.4 rpm which you can download here. If you are currently running RedHat 7.1, you can install either of these RPMs before you upgrade to RedHat 7.2.

Update 11/9/2001: RedHat has released an iptables-1.2.4 RPM of their own which you can download from http://www.redhat.com/support/errata/RHSA-2001-144.html.I have installed this RPM on my firewall and it works fine.

If you would like to patch iptables 1.2.3 yourself, the patches are available for download. This patch which corrects a problem with parsing of the --log-level specification while this patch corrects a problem in handling the  TOS target.

To install one of the above patches:

• cd iptables-1.2.3/extensions
• patch -p0 < the-patch-file

Problems with kernels >= 2.4.18 and RedHat iptables

Users who use RedHat iptables RPMs and who upgrade to kernel 2.4.18/19 may experience the following:

# shorewall start
Processing /etc/shorewall/shorewall.conf ...
Processing /etc/shorewall/params ...
Starting Shorewall...
Loading Modules...
Initializing...
Determining Zones...
Zones: net
Validating interfaces file...
Validating hosts file...
Determining Hosts in Zones...
Net Zone: eth0:0.0.0.0/0
iptables: libiptc/libip4tc.c:380: do_check: Assertion
`h->info.valid_hooks == (1 << 0 | 1 << 3)' failed.
Aborted (core dumped)
iptables: libiptc/libip4tc.c:380: do_check: Assertion
`h->info.valid_hooks == (1 << 0 | 1 << 3)' failed.
Aborted (core dumped)

The RedHat iptables RPM is compiled with debugging enabled but the user-space debugging code was not updated to reflect recent changes in the Netfilter 'mangle' table. You can correct the problem by installing this iptables RPM. If you are already running a 1.2.5 version of iptables, you will need to specify the --oldpackage option to rpm (e.g., "iptables -Uvh --oldpackage iptables-1.2.5-1.i386.rpm").

Problems installing/upgrading RPM on SuSE

If you find that rpm complains about a conflict with kernel <= 2.2 yet you have a 2.4 kernel installed, simply use the "--nodeps" option to rpm.

Installing: rpm -ivh --nodeps <shorewall rpm>

Upgrading: rpm -Uvh --nodeps <shorewall rpm>

Problems with iptables version 1.2.7 and MULTIPORT=Yes

The iptables 1.2.7 release of iptables has made an incompatible change to the syntax used to specify multiport match rules; as a consequence, if you install iptables 1.2.7 you must be running Shorewall 1.3.7a or later or:

• set MULTIPORT=No in /etc/shorewall/shorewall.conf; or
• if you are running Shorewall 1.3.6 you may install this firewall script in /usr/lib/shorewall/firewall as described above.

Problems with RH Kernel 2.4.18-10 and NAT

#EXTERNAL       INTERFACE       INTERNAL        ALL INTERFACES          LOCAL
192.0.2.22      eth0            192.168.9.22    yes                     yes
#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE

Setting up NAT...
iptables: Invalid argument
Terminated

Problems with RH Kernels after 2.4.20-9 and REJECT (also applies to 2.4.21-RC1)

Last updated 12/17/2003 - Tom Eastep

Copyright © 2001, 2002, 2003 Thomas M. Eastep.