shorewall_code/STABLE2/releasenotes.txt

Shorewall 2.0.2c

----------------------------------------------------------------------
Problems Corrected since 2.0.1

1) The /etc/init.d/shorewall script installed on Debian by install.sh
   failed silently due to a missing file
   (/usr/share/shorewall/wait4ifup). That file is not part of the
   normal Shorewall distribution and is provided by the Debian
   maintainer.

2) A meaningless warning message out of the proxyarp file processing
   has been eliminated.

3) The "shorewall delete" command now correctly removes all dynamic 
   rules pertaining to the host(s) being deleted. Thanks to Stefan 
   Engel for this correction.

Problems Corrected since 2.0.2

1) The 'firewall' script is not purging temporary restore files in
   /var/lib/shorewall. These files have names of the form
   "restore-nnnnn".

2) The /var/lib/shorewall/restore script did not load the kernel
   modules specified in /etc/shorewall/modules.

3) Specifying a null common action in /etc/shorewall/actions (e.g.,
   :REJECT) results in a startup error.

4) If /var/lib/shorewall does not exist, shorewall start fails.

5) DNAT rules with a dynamic source zone don't work properly. When
   used, these rules cause the rule to be checked against ALL input,
   not just input from the designated zone.

-----------------------------------------------------------------------
Issues when migrating from Shorewall 2.0.1 to Shorewall 2.0.2:

1) Extension Scripts

   In order for extension scripts to work properly with the new
   iptables-save/restore integration (see New Feature 1 below), some
   change may be required to your extension scripts.

   If your extension scripts are executing commands other than iptables
   then those commands must also be written to the restore file (a
   temporary file in /var/lib/shorewall that is renamed
   /var/lib/shorewall/restore-base at the end of the operation).

   The following functions should be of help:

   A. save_command() -- saves the passed command to the restore file.

   Example:

    save_command echo Operation Complete

   That command would simply write "echo Operation Complete" to the
   restore file.

   B. run_and_save_command() -- saves the passed command to the restore
   file then executes it. The return value is the exit status of the
   command.

   Example: 

     run_and_save_command "echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all"

   Note that as in this example, when the command involves file
   redirection then the entire command must be enclosed in quotes. This
   applies to all of the functions described here.

   C. ensure_and_save_command() -- runs the passed command. If the
   command fails, the firewall is restored to it's prior saved state
   and the operation is terminated. If the command succeeds, the
   command is written to the restore file.

2) Dynamic Zone support.

   If you don't need to use the "shorewall add" and "shorewall delete"
   commands, you should set DYNAMIC_ZONES=No in
   /etc/shorewall/shorewall.conf.

New Features:

1) Shorewall has now been integrated with
   iptables-save/iptables-restore to provide very fast start and
   restart. The elements of this integration are as follows:

   a) The 'shorewall save' command now saves the current configuration
      in addition to the current dynamic blacklist. If you have
      dynamic zones, you will want to issue 'shorewall save' when the
      zones are empty or the current contents of the zones will be
      restored by the 'shorewall restore' and 'shorewall -f start'
      commands.

   b) The 'shorewall restore' command has been added. This command
      restores the configuration at the time of the last 'save'.

   c) The -f (fast) option has been added to 'shorewall start'. When
      specified (e.g. 'shorewall -f start'), shorewall will perform a
      'shorewall restore' if there is a saved configuration. If there
      is no saved configuration, a normal 'shorewall start' is
      performed.

   d) The /etc/init.d/shorewall script now translates the 'start'
      command into 'shorewall -f start' so that fast restart is
      possible.

   e) When a state-changing command encounters an error and there is a
      current saved configuration, that configuration will be restored
      (currently, the firewall is placed in the 'stopped' state).

   f) If you have previously saved the running configuration and want
      Shorewall to discard it, use the 'shorewall forget' command.

   WARNING: iptables 1.2.9 is broken with respect to iptables-save;
   If your kernel has connection tracking match support, you must
   patch iptables 1.2.9 with the iptables patch availale from
   the Shorewall errata page.

2) The previous implementation of dynamic zones was difficult to
   maintain. I have changed the code to make dynamic zones optional
   under the control of the DYNAMIC_ZONES option in
   /etc/shorewall/shorewall.conf.

3) In earlier Shorewall 2.0 releases, Shorewall searches in order the
   following directories for configuration files.

   a) The directory specified in a 'try' command or specified using
      the -c option.

   b) /etc/shorewall

   c) /usr/share/shorewall

   In this release, the CONFIG_PATH option is added to shorewall.conf.
   CONFIG_PATH contains a list of directory names separated by colons
   (":"). If not set or set to a null value (e.g., CONFIG_PATH="") then
   "CONFIG_PATH=/etc/shorewall:/usr/share/shorewall" is assumed.

   Now Shorewall searches for shorewall.conf according to the old
   rules and for other configuration files as follows:

   a) The directory specified in a 'try' command or specified using
      the -c option.

   b) Each directory in $CONFIG_PATH is searched in sequence.

   In case it is not obvious, your CONFIG_PATH should include
   /usr/share/shorewall and your shorewall.conf file must be in the
   directory specified via -c or in a try command, in /etc/shorewall
   or in /usr/share/shorewall.

   For distribution packagers, the default CONFIG_PATH is set in
   /usr/share/shorewall/configpath. You can customize this file to
   have a default that differs from mine.

4) Previously, in /etc/shorewall/nat a Yes (or yes) in the LOCAL column
   would only take effect if the ALL INTERFACES column also contained
   Yes or yes. Now, the LOCAL columns contents are treated
   independently of the contents of the ALL INTERFACES column.

5) The folks at Mandrake have created yet another kernel module
   naming convention (module names end in "ko.gz"). As a consequence,
   beginning with this release, if MODULE_SUFFIX isn't specified in
   shorewall.conf, then the default value is "o gz ko o.gz ko.gz".

6) An updated bogons file is included in this release.

7) In /etc/shorewall/rules and in action files generated from
   /usr/share/shorewall/action.template, rules that perform logging can
   specify an optional "log tag". A log tag is a string of alphanumeric
   characters and is specified by following the log level with ":" and
   the log tag.

   Example:

	ACCEPT:info:ftp	net	dmz	tcp	21

   The log tag is appended to the log prefix generated by the LOGPREFIX
   variable in /etc/shorewall/conf. If "ACCEPT:info" generates the log
   prefix "Shorewall:net2dmz:ACCEPT:" then "ACCEPT:info:ftp" will
   generate "Shorewall:net2dmz:ACCEPT:ftp " (note the trailing blank). 
   The maximum length of a log prefix supported by iptables is 29
   characters; if a larger prefix is generated, Shorewall will issue a
   warning message and will truncate the prefix to 29 characters.

8) A new "-q" option has been added to /sbin/shorewall commands. It
   causes the start, restart, check and refresh commands to produce
   much less output so that warning messages are more visible (when
   testing this change, I discovered a bug where a bogus warning
   message was being generated).

9) Shorewall now uses 'modprobe' to load kernel modules if that utility
   is available in the PATH; otherwise, 'insmod' is used.

10) It is now possible to restrict entries in the /etc/shorewall/masq
    file to particular protocols and destination port(s). Two new
    columns (PROTO and PORT(S)) have been added to the file.

    Example:

    You want all outgoing SMTP traffic entering the firewall
    on eth1 to be sent from eth0 with source IP address 
    206.124.146.177. You want all other outgoing traffic 
    from eth1 to be sent from eth0 with source IP address
    206.124.146.176.

	eth0	eth1	206.124.146.177	tcp	25
	eth0	eth1	206.124.146.176

    THE ORDER OF THE ABOVE TWO RULES IS SIGNIFICANT!!!!!

    Assuming that 10.0.0.0/8 is the only host/network connected
    to eth1, the progress message at "shorewall start" would be:

    Masqueraded Networks and Hosts:
       To 0.0.0.0/0 (tcp 25) from 10.0.0.0/8 through eth0 using 206.124.146.177
       To 0.0.0.0/0 (all) from 10.0.0.0/8 through eth0 using 206.124.146.176

11) Two new actions are available in the /etc/shorewall/rules file.

    ACCEPT+    -- Behaves like ACCEPT with the exception that it exempts
                  matching connections from subsequent DNAT[-] and
                  REDIRECT[-] rules.

    NONAT      -- Exempts matching connections from subsequent DNAT[-]
                  and REDIRECT[-] rules.

12) A new extension script 'initdone' has been added. This script is invoked
    at the same point as the 'common' script was previously and is useful for
    users who mis-used that script under Shorewall 1.x (the script was intended 
    for adding rules to the 'common' chain but many users treated it as a script
    for adding rules before Shorewall's).

13) Installing/Upgrading Shorewall on Slackware has been
    improved. Slackware users must use the tarball and must modify
    settings in the install.sh script before running it as follows:

    DEST="/etc/rc.d"
    INIT="rc.firewall"

    Thanks to Alex Wilms for helping with this change.