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shorewall_code/Shorewall/releasenotes.txt
teastep 96c4d02dbc Document ADMINISABSENTMINDED/routstopped fix 
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@2709 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
2005-09-19 14:17:09 +00:00

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Shorewall 2.5.7.
Problems Corrected in 2.5.7:
1) In previous versions, when the command is 'start', 'restart' or
'stop' then OUTPUT traffic to hosts listed in
/etc/shorewall/routestopped is not enabled if
ADMINISABSENTMINDED=Yes. That traffic is now enabled independent of
the setting of ADMINISABSENTMINDED.
Problems Corrected in 2.5.6:
1) The following fatal error could occur at startup:
ERROR: Command "/sbin/iptables -A INPUT -j LOG --log-level NONE
--log-prefix "Shorewall:INPUT:ACCEPT:"" Failed
That problem has been corrected.
2) The Makefile is now unconditionally installed in /etc/shorewall
during an upgrade (the prior copy has been saved in
/etc/shorewall-<version>.bkout/Makefile).
New Features in 2.5.6:
1) The install.sh script now does a much cleaner job of backing up the
current installation. It copies the directories /etc/shorewall,
/usr/share/shorewall and /var/lib/shorewall to a directory of the
same name with "-$VERSION.bkout" appended. The init script and
/sbin/shorewall are backed up to the /usr/share/shorewall and
/var/lib/shorewall directories respectively. This makes it very
simple to remove the backups:
rm -rf /etc/shorewall-*.bkout
rm -rf /usr/share/shorewall-*.bkout
rm -rf /var/lib/shorewall-*.bkout
2) A new '-n' option has been added to the "start", "restart",
"restore", "stop" and "try" commands. This option instructs
Shorewall to not alter the routing in any way.
This option is useful when you have a multi-ISP environment because
it prevents the route cache from being flushed which preserves the
mapping of end-point address pairs to routes.
Problems Corrected in 2.5.5:
1) The install script now installs the correct Makefile. Previously,
the /etc/shorewall/actions file was identical to the Makefile.
2) Error Handling was completely broken; operations such as
"shorewall start" would continue after what should have been fatal
errors.
Problems Corrected in 2.5.4:
1) Several serious problems associated with macros have been corrected.
Problems Corrected in 2.5.3:
1) The Netfilter 'raw' table is now cleared during "shorewall stop",
"shorewall [re]start" and "shorewall clear".
Problems Corrected in 2.5.2:
1) You may now include port lists in in the /etc/shorewall/accounting
file.
2) The packet type match capability is now correctly reported when
PKTTYPE=No in /etc/shorewall/shorewall.conf.
Problems Corrected in 2.5.1:
1) Shorewall is no longer dependent on the 'which' utility.
2) "shorewall add" no longer fails when the 'ipsec' option has appeared
in /etc/shorewall/hosts.
3) The Makefile has been changed to compare the modification times of
the files in /etc/shorewall with
/var/lib/shorewall/restore-base. That file is modified each time
that Shorewall is [re]started whereas /var/lib/shorewall/restarted
is also modified by "shorewall reset" and "shorewall refresh".
4) The handling of log levels passed to macros has been
corrected. Previously, passing a log level to a macro resulted in a
[re]start error.
Problems Corrected in 2.5.0:
1) The behavior of CONTINUE policies has been improved. Shorewall no
longer generates a useless policy chain corresponding to these
policies.
2) The combining of the zones and ipsec files has now been made upward
compatible provided that the user doesn't do something idiotic such
as install the new shorewall.conf file then manually update it
with exactly the changes that had been applied to the old file.
Migration Considerations:
1) The "monitor" command has been eliminated.
2) The "DISPLAY" and "COMMENTS" columns in the /etc/shorewall/zones
file have been removed and have been replaced by the former
columns of the /etc/shorewall/ipsec file. The latter file has been
removed.
Additionally the FW option in shorewall.conf has been deprecated and
is no longer set to 'fw' by default. New users are expected to
define the firewall zone in /etc/shorewall/zones.
Adhering to the principle of least astonishment, the old
/etc/shorewall/ipsec file will continue to be supported. A new
IPSECFILE variable in /etc/shorewall/shorewall.conf determines the
name of the file that Shorewall looks in for IPSEC information. If
that variable is not set or is set to the empty value then
IPSECFILE=ipsec is assumed. So if you simply upgrade and don't do
something idiotic like replace your current shorewall.conf file with
the new one, your old configuration will continue to work. A dummy
'ipsec' file is included in the release so that your package manager
(e.g., rpm) won't remove your existing file.
The shorewall.conf file included in this release sets
IPSECFILE=zones so that new users are expected to use the new zone
file format.
As a result, the columns in the /etc/shorewall/zones file
are now as follows:
ZONE Short name of the zone (5 Characters or less in
length). The names "all" and "none" are
reserved and may not be used as zone names.
Where a zone is nested in one or more other
zones, you may follow the (sub)zone name by ":"
and a comma-separated list of the parent
zones. The parent zones must have been defined
in earlier records in this file.
Example:
#ZONE TYPE OPTIONS
a plain
b plain
c:a,b plain
Currently, Shorewall uses this information only
to reorder the zone list so that parent zones
appear after their subzones in the list. In the
future, Shorewall may make more extensive use
of that information.
TYPE plain - This is the standard Shorewall zone type and is
the default if the column is left empty or if
it is entered as "-". Communication with some
zone hosts may be encrypted. Encrypted hosts
are designated using the 'ipsec' option in
/etc/shorewall/hosts.
ipsec - Communication with all zone hosts is encrypted
Your kernel and iptables must include policy
match support.
firewall
- Designates the firewall itself. You must have
exactly one 'firewall' zone. No options are
permitted with a 'firewall' zone.
OPTIONS, A comma-separated list of options as
IN OPTIONS, follows:
OUT OPTIONS
reqid=<number> where <number> is
specified using setkey(8) using the
'unique:<number> option for the SPD
level.
spi=<number> where <number> is the SPI
of the SA used to encrypt/decrypt
packets.
proto=ah|esp|ipcomp
mss=<number> (sets the MSS field in TCP
packets)
mode=transport|tunnel
tunnel-src=<address>[/<mask>] (only
available with mode=tunnel)
tunnel-dst=<address>[/<mask>] (only
available with mode=tunnel)
strict Means that packets must match
all rules.
next Separates rules; can only be
used with strict..
Example:
mode=transport,reqid=44
The options in the OPTIONS column are applied to both
incoming and outgoing traffic. The IN OPTIONS are
applied to incoming traffic (in addition to OPTIONS)
and the OUT OPTIONS are applied to outgoing traffic.
If you wish to leave a column empty but need to make an
entry in a following column, use "-".
THE ORDER OF THE ENTRIES IN THIS FILE IS IMPORTANT IF YOU HAVE
NESTED OR OVERLAPPING ZONES DEFINED THROUGH /etc/shorewall/hosts.
3) The DROPINVALID option has been removed from shorewall.conf. The
behavior will be as if DROPINVALID=No had been specified. If you
wish to drop invalid state packets, use the dropInvalid built-in
action.
4) The 'nobogons' interface and hosts option as well as the
BOGON_LOG_LEVEL option have been eliminated.
5) Most of the standard actions have been replaced by parameterized
macros (see below). So for example, the action.AllowSMTP and
action.DropSMTP have been removed an a parameterized macro
macro.SMTP has been added to replace them.
In order that current users don't have to immediately update their
rules and user-defined actions, Shorewall can substitute an
invocation of the a new macro for an existing invocation of one of
the old actions. So if your rules file calls AllowSMTP, Shorewall
will replace that call with SMTP/ACCEPT. Because this substitution
is expensive, it is conditional based on the setting of
MAPOLDACTIONS in shorewall.conf. If this option is set to YES or if
it is not set (such as if you are using your old shorewall.conf
file) then Shorewall will perform the substitution. Once you have
converted to use the new macros, you can set MAPOLDACTIONS=No and
invocations of those actions will go much quicker during 'shorewall
[re]start'.
6) The STATEDIR variable in /etc/shorewall/shorewall.conf has been
removed. STATEDIR is now fixed at /var/lib/shorewall. If you have
previously set STATEDIR to another directory, please copy the files
from that directory to /var/lib/shorewall/ before [re]starting
Shorewall after the upgrade to this version.
7) The "shorewall status" command now just gives the status of
Shorewall (started or not-started). The previous status command has
been renamed "dump". The command also shows the state relative to the
state diagram at
http://shorewall.net/starting_and_stopping_shorewall.htm. In
addition to the state, the time and date at which that state was
entered is shown.
Note that at least one "shorewall [re]start" must be issued after
upgrading to this release before "shorewall status" will show
anything but "Unknown" for the state.
8) The "shorewall forget" command now removes the dynamic blacklist
save file (/var/lib/shorewall/save).
9) In previous versions of Shorewall, the rules generated by entries in
/etc/shorewall/tunnels preceded those rules generated by entries in
/etc/shorewall/rules. Beginning with this release, the rules
generated by entries in the tunnels file will appear *AFTER* the
rules generated by the rules file. This may cause you problems if
you have REJECT, DENY or CONTINUE rules in your rules file that
would cause the tunnel transport packets to not reach the rules that
ACCEPT them. See http://www.shorewall.net/VPNBasics.html for
information on the rules generated by entries in the tunnels file.
10) In previous releases, the "refresh" command could source your tcstart
script. Beginning with this release, "refresh" will run that script
if it is executable but will not source it. Users of third-party TC
scripts like WonderShaper should see no change provided that
execute permission is placed on /etc/shorewall/tcstart.
New Features in Shorewall 2.5.*
1) Error and warning messages are made easier to spot by using
capitalization (e.g., ERROR: and WARNING:).
2) A new option 'critical' has been added to
/etc/shorewall/routestopped. This option can be used to enable
communication with a host or set of hosts during the entire
"shorewall [re]start/stop" process. Listing a host with this option
differs from listing it without the option in several ways:
a) The option only affect traffic between the listed host(s) and the
firewall itself.
b) If there are any entries with 'critical', the firewall
will be completely opened briefly during start, restart and stop but
there will be no chance of any packets to/from the listed host(s)
being dropped or rejected.
Possible uses for this option are:
a) Root fileset is NFS mounted. You will want to list the NFS server
in the 'critical' option.
b) You are running Shorewall in a Crossbeam environment
(www.crossbeam.com). You will want to list the Crossbeam interface
in this option
3) A new 'macro' feature has been added.
Macros are very similar to actions and can be used in similar
ways. The differences between actions and macros are as follows:
a) An action creates a separate chain with the same name as the
action (when logging is specified on the invocation of an action,
a chain beginning with "%" followed by the name of the action and
possibly followed by a number is created). When a macro is
invoked, it is expanded in-line and no new chain is created.
b) An action may be specified as the default action for a policy;
macros cannot be specified this way.
c) Actions must be listed in either /usr/share/shorewall/actions.std
or in /etc/shorewall/actions. Macros are defined simply by
placing their definition file in the CONFIG_PATH.
d) Actions are defined in a file with a name beginning with
"action." and followed by the name of the action. Macro files are
defined in a file with a name beginning with "macro.".
e) Actions may invoke other actions. Macros may not directly invoke
other macros although they may invoke other macros indirectly
through an action.
f) DNAT[-] and REDIRECT[-] rules may not appear in an action. They
are allowed in a macro with the restriction that the a macro
containing one of these rules may not be invoked from an action.
g) The values specified in the various columns when you invoke a
macro are substituted in the corresponding column in each rule in
the macro. The first three columns get special treatment:
ACTION If you code PARAM as the action in a macro then
when you invoke the macro, you can include the
name of the macro followed by a slash ("/") and
an ACTION (either builtin or user-defined. All
instances of PARAM in the body of the macro will be
replaced with the ACTION.
Any logging applied when the macro is invoked is
applied following the same rules as for actions.
SOURCE and
DEST If the rule in the macro file specifies a value and
the invocation of the rule also specifies a value then
the value in the invocation is appended to the value
in the rule using ":" as a separator.
Example:
/etc/shorewall/macro.SMTP
PARAM - loc tcp 25
/etc/shorewall/rules:
SMTP/DNAT:info net 192.168.1.5
Would be equivalent to the following in the rules file:
DNAT:info net loc:192.168.1.5 tcp 25
Rest Any value in the invocation replaces the value in the
rule in the macro.
One additional restriction applies to the mixing of macros and
actions. Macros that are invoked from actions cannot themselves
invoke other actions.
4) If you have 'make' installed on your firewall, then when you use
the '-f' option to 'shorewall start' (as happens when you reboot),
if your /etc/shorewall/ directory contains files that were modified
after Shorewall was last restarted then Shorewall is started using
the config files rather than using the saved configuration.
5) The 'arp_ignore' option has been added to /etc/shorewall/interfaces
entries. This option sets
/proc/sys/net/ipv4/conf/<interface>/arp_ignore. By default, the
option sets the value to 1. You can also write arp_ignore=<value>
where value is one of the following:
1 - reply only if the target IP address is local address
configured on the incoming interface
2 - reply only if the target IP address is local address
configured on the incoming interface and both with the sender's
IP address are part from same subnet on this interface
3 - do not reply for local addresses configured with scope
host, only resolutions for global and link addresses are
replied
4-7 - reserved
8 - do not reply for all local addresses
WARNING -- DO NOT SPECIFY arp_ignore FOR ANY INTERFACE INVOLVED IN
PROXY ARP.
6) In /etc/shorewall/rules, "all+" in the SOURCE or DEST column works
like "all" but also includes intrazone traffic. So the rule:
ACCEPT loc all+ tcp 22
would allow SSH traffic from loc->loc whereas
ACCEPT loc all tcp 22
does not.
7) A new FASTACCEPT option has been added to shorewall.conf.
Normally, Shorewall accepting ESTABLISHED/RELATED packets until
these packets reach the chain in which the original connection was
accepted. So for packets going from the 'loc' zone to the 'net'
zone, ESTABLISHED/RELATED packets are ACCEPTED in the 'loc2net'
chain.
If you set FASTACCEPT=Yes, then ESTABLISHED/RELEATED packets are
accepted early in the INPUT, FORWARD and OUTPUT chains. If you set
FASTACCEPT=Yes then you may not include rules in the ESTABLISHED or
RELATED sections of /etc/shorewall/rules.
8) Shorewall now generates an error if the 'norfc1918' option is
specified for an interface with an RFC 1918 address.
9) You may now specify "!" followed by a list of addresses in the
SOURCE and DEST columns of entries in /etc/shorewall/rules,
/etc/shorewall/tcrules and in action files and Shorewall will
generate the rule that you expect.
Example 1 (/etc/shorewall/rules):
#ACTION SOURCE DEST PROTO DEST PORT(S)
ACCEPT loc:!192.168.1.0/24,10.0.0.0/8 net tcp 80
That rule would allow loc->net HTTP access except for the local
networks 192.168.1.0/24 and 10.0.0.0/8.
Example 2 (/etc/shorewall/rules):
#ACTION SOURCE DEST PROTO DEST PORT(S)
ACCEPT loc:10.0.0.0/24!10.0.0.4,10.0.0.22 \
net tcp 80
That rule would allow loc->net HTTP access from the local
network 10.0.0.0/24 except for hosts 10.0.0.4 and 10.0.0.22.
10) You may now specify "!" followed by a list of addresses in the
SOURCE and DEST columns of entries in /etc/shorewall/tcrules and
Shorewall will generate the rule that you expect.
11) Tunnel types "openvpnserver" and "openvpnclient" have been added
to reflect the introduction of client and server OpenVPN
configurations in OpenVPN 2.0.
12) The COMMAND variable is now set to 'restore' in restore
scripts. The value of this variable is sometimes of interest to
programmers providing custom /etc/shorewall/tcstart scripts.
13) Previously, if you defined any intra-zone rule(s) then any traffic
not matching the rule(s) was subject to normal policies (which
usually turned out to involve the all->all REJECT policy). Now, the
intra-zone ACCEPT policy will still be in effect in the presense of
intra-zone rules. That policy can still be overridden by an
explicit policy in your /etc/shorewall/policy file.
Example:
/etc/shorewall/rules:
DNAT loc:!192.168.1.4 loc:192.168.1.4:3128 tcp 80
Any other loc->loc traffic will still be accepted. If you want to
also log that other loc->loc traffic at the info log level then
insert this into /etc/shorewall/policy:
#SOURCE DEST POLICY LOG LEVEL
loc loc ACCEPT info
14) Prior to Shorewall 2.5.3, the rules file only controlled packets in
the Netfilter states NEW and INVALID. Beginning with this release,
the rules file can also deal with packets in the ESTABLISHED and
RELATED states.
The /etc/shorewall/rules file may now be divided into
"sections". Each section is introduced by a line that begins with
the keyword SECTION followed by the section name. Sections
are as listed below and must appear in the order shown.
ESTABLISHED
Rules in this section apply to packets in the ESTABLISHED
state.
RELATED
Rules in this section apply to packets in the RELATED state.
NEW
Rules in this section apply to packets in the NEW and INVALID
states.
Rules in the ESTABLISHED and RELATED sections are limited to the
following ACTIONs:
ACCEPT, DROP, REJECT, QUEUE, LOG and User-defined actions.
Macros may be used in these sections provided that they expand to
only these ACTIONs.
At the end of the ESTABLISHED and RELATED sections, there is an
implicit "ALLOW all all all" rule.
RESTRICTION: If you specify FASTACCEPT=Yes in
/etc/shorewall.shorewall.conf then the ESTABLISHED and RELATED
sections must be empty.
15) The value 'ipp2p' is once again allowed in the PROTO column of
the rules file. It is recommended that rules specifying 'ipp2p'
only be included in the ESTABLISHED section of the file.
16) Shorewall actions lack a generalized way to pass parameters to an
extension script associated with an action. To work around this
lack, some users have used the log tag as a parameter. This works
but requires that a log level other than 'none' be specified when
the action is invoked. Beginning with this release, you can invoke
an action with 'none'.
Example:
#ACTION SOURCE DEST
A:none:these,are,parameters $FW net
When /etc/shorewall/A is invoked, the LEVEL variable will be empty
but the TAG variable will contain "these,are,parameters" which
can be easily parsed to isolate "these", "are" and "parameters":
ifs=$IFS
IFS=,
set -- $TAG
IFS=$ifs
Now, $1 = these, $2 = are and $3 = parameters
17) The "shorewall check" command now checks the /etc/shorewall/masq,
/etc/shorewall/blacklist, /etc/shorewall/proxyarp,
/etc/shorewall/nat and /etc/shorewall/providers files.
18) Arne Bernin's "tc4shorewall" package has been integrated into
Shorewall. Arne will be providing documentation and support for
this part of Shorewall.
Thanks, Arne!
19) When /usr/share/shorewall/functions is loaded it now sets
SHOREWALL_LIBRARY=Loaded
Application code such as /etc/shorewall/tcstart may test that
variable to determine if the library has been loaded into the
current shell process.
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