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Shorewall 4.1 Patch Release 4.
----------------------------------------------------------------------------
R E L E A S E 4 . 1 H I G H L I G H T S
----------------------------------------------------------------------------
1) Support is included for multiple internet providers through the same
ethernet interface.
2) Support for NFLOG has been added.
3) Enhanced operational logging.
4) The tarball installers now work under Cygwin.
Problems corrected in Shorewall 4.1.4.
1) Previously, a value of 0 was ignored in the TEST column of tcrules
and the MARK column of the rules files.
Also, the default mask for entries in these columns has been
changed from 0xFF to 0xFFFF for compatibility with Shorewall-shell.
2) The compilation date recorded in the firewall.conf file produced by
Shorewall-perl was previously mangled.
3) The following situation would result in unexpected behavior.
/etc/shorewall/zones:
#ZONE TYPE
fw firewall
net ipv4
loc ipv4
dmz ipv4
/etc/shorewall/interfaces:
#ZONE INTERFACE BROADCAST OPTIONS
net ppp0
loc eth1
loc ppp+
dmz eth2
/etc/shorewall/rules:
#ACTION SOURCE DEST PROTO DEST
# PORT(S)
ACCEPT net dmz tcp 80
REDIRECT loc 3128 tcp 80
The web server in the dmz (implied by the first rule) is
inaccessible from the 'net' zone because the REDIRECT rule
redirects all traffic arriving on 'ppp+' to local port 3128.
Shorewall 4.1.4 includes a fix for this problem that also requires
a configuration change.
The basic problem with the above configuration is that 'net' is a
sub-zone of 'loc' (since ppp0 is a subset of ppp+) but Shorewall
isn't able to recognize that fact.
By changing the /etc/shorewall/zones file to make the parent/child
relationship explicit, Shorewall will now know that 'net' is a
sub-zone of 'loc'.
/etc/shorewall/zones:
#ZONE TYPE
fw firewall
loc ipv4
net:loc ipv4
dmz ipv4
Be sure that there are no CONTINUE policies from net to another
zone and that IMPLICIT_CONTINUE=No (to prevent implicit CONTINUE
policies from 'net' to all other zones).
Other changes in Shorewall 4.1.4.
1) When installing on Cygwin, /etc/shorewall is no longer fully
populated. Rather, only the shorewall.conf and params files are
installed. As always, the full configuration file set is installed
in /usr/share/shorewall/configfiles.
2) Specifying a destination zone in a NAT-only rule now generates a
warning and the destination zone is ignored. NAT-only rules are:
NONAT
REDIRECT-
DNAT-
3) The /etc/shorewall/masq and /etc/shorewall/nat file now accept a
comma-separated list of interface names where before only a single
interface name could be listed (Shorewall-perl only).
This feature is not for beginners. It iterates over the
list of interfaces, substituting each interface in place of the
list and processing the resulting entry according to the semantics
of earlier Shorewall versions. If you don't know where to use this,
don't try.
Example 1:
/etc/shorewall/masq:
#INTERFACE SOURCE ADDRESS
eth0,eth1 eth2 1.2.3.4
equivalent to:
#INTERFACE SOURCE ADDRESS
eth0 eth2 1.2.3.4
eth1 eth2 1.2.3.4
Example 2:
/etc/shorewall/masq:
#INTERFACE SOURCE ADDRESS
eth0,eth1::192.168.1.0/24 eth2 1.2.3.4
equivalent to:
#INTERFACE SOURCE ADDRESS
eth0::192.168.1.0/24 eth2 1.2.3.4
eth1::192.168.1.0/24 eth2 1.2.3.4
Example 3:
/etc/shorewall/nat:
#EXTERNAL INTERFACE INTERNAL
206.124.146.178 eth0,wlan0 192.168.1.3
equivalent to:
#EXTERNAL INTERFACE INTERNAL
206.124.146.178 eth0 192.168.1.3
206.124.146.178 wlan0 192.168.1.3
Migration Issues.
1) Previously, when HIGH_ROUTE_MARKS=Yes, Shorewall allowed non-zero
mark values < 256 to be assigned in the OUTPUT chain. This has been
changed so that only high mark values may be assigned
there. Packet marking rules for traffic shaping of packets
originating on the firewall must be coded in the POSTROUTING table.
2) Previously, Shorewall did not range-check the value of the
VERBOSITY option in shorewall.conf. Beginning with Shorewall 4.1:
a) A VERBOSITY setting outside the range -1 through 2 is rejected.
b) After the -v and -q options are applied, the resulting value is
adjusted to fall within the range -1 through 2.
3) Specifying a destination zone in a NAT-only rule now generates a
warning and the destination zone is ignored. NAT-only rules are:
NONAT
REDIRECT-
DNAT-
New Features in Shorewall 4.1.
1) Shorewall 4.1 contains experimental support for multiple Internet
providers through a single ethernet interface. Configuring two
providers through a single interface differs from two providers
through two interfaces in several ways.
a) Only ethernet (or ethernet-like) interfaces can be used. For
inbound traffic, the MAC addresses of the gateway routers is used
to determine which provider a packet was received through. Note
that only routed traffic can be categorized using this technique.
b) You must specify the address on the interface that corresponds to
a particular provider in the INTERFACE column by following the
interface name with a colon (":") and the address.
c) Entries in /etc/shorewall/masq must be qualified by the provider
name (or number).
d) This feature requires Realm Match support in your kernel and
iptables. If you use a capabilities file, you need to regenerate
the file with Shorewall 4.1 or Shorewall-lite 4.1.
e) You must add route_rules entries for networks that are accessed
through a particular provider.
f) If you have additional IP addresses through either provider,
you must add route_rules to direct traffic FROM each of those
addresses through the appropriate provider.
g) You must add MARK rules for any traffic that you know originates
from a particular provider.
Example:
Providers Blarg (1) and Avvanta (2) are both connected to
eth0. The firewall's IP address with Blarg is 206.124.146.176/24
(gateway 206.124.146.254) and the IP address from Avvanta is
130.252.144.8/24 (gateway 130.252.144.254). We have a second IP
address (206.124.146.177) from Blarg.
/etc/shorewall/providers:
#PROVIDER NUMBER MARK DUPLICATE INTERFACE GATEWAY
Blarg 1 1 main eth0:206.124.146.176 206.124.146.254 ...
Avvanta 2 2 main eth0:130.252.144.8 130.252.144.254 ...
/etc/shorewall/masq:
#INTERFACE SOURCE ADDRESS
eth0(Blarg) 130.252.144.8 206.124.146.176
eth0(Avvanta) 206.124.146.176 130.252.144.8
eth0(Blarg) eth1 206.124.146.176
eth0(Avvanta) eth1 130.252.144.8
/etc/shorewall/route_rules:
#SOURCE DEST PROVIDER PRIORITY
- 206.124.146.0/24 Blarg 1000
- 130.252.144.0/24 Avvanta 1000
206.124.146.177 - Blarg 26000
/etc/shorewall/tcrules
#MARK/CLASSIFY SOURCE DEST
1 eth0:206.124.146.0/24 0.0.0.0/0
2 eth0:130.242.144.0/24 0.0.0.0/0
2) You may now include the name of a table (nat, mangle or filter) in
a 'shorewall refresh' command by following the table name with a
colon (e.g., mangle:). This causes all non-builtin chains in the
table to be reloaded.
Example:
shorewall refresh nat:
3) When no chain name is given to the 'shorewall refresh' command, the
mangle table is refreshed along with the blacklist chain (if
any). This allows you to modify /etc/shorewall/tcrules and install
the changes using 'shorewall refresh'.
4) Support for the NFLOG log target has been added. NFLOG is a
successor to ULOG. In addition, both ULOG and NFLOG may be followed
by a list of up to three numbers in parentheses.
The first number specifies the netlink group (1-32). If omitted
(e.g., NFLOG(,0,10)) then a value of 1 is assumed.
The second number specifies the maximum number of bytes to copy. If
omitted, 0 (no limit) is assumed.
The third number specifies the number of log messages that should
be buffered in the kernel before they are sent to user space. The
default is 1.
Examples:
/etc/shorewall/shorewall.conf:
MACLIST_LOG_LEVEL=NFLOG(1,0,1)
/etc/shorewall/rules:
ACCEPT:NFLOG(1,0,1) vpn fw tcp ssh,time,631,8080
5) Shorewall-perl 4.1 implements an alternative syntax for macro
parameters and for the NFQUEUE queue number. Rather than following
the macro name (or NFQUEUE) with a slash ("/") and the parameter,
the parameter may be enclosed in parentheses.
Examples -- each pair shown below are equivalent:
DNS/ACCEPT DNS(ACCEPT)
NFQUEUE/3 NFQUEUE(3)
The old syntax will still be accepted but will cease to be documented
in some future Shorewall release.
6) Shorewall 4.1 contains enhanced operational logging capabilities
through a set of related enhancements to Shorewall-common and
Shorewall-perl. The enhancements are not supported by
Shorewall-shell nor are they supported by Shorewall-lite except
when the script is compiled using Shorewall-perl.
a) The STARTUP_LOG option in /etc/shorewall/shorewall.conf gives
the name of the Shorewall operational log. The log will be
created if it does not exist.
b) The LOG_VERBOSITY option in /etc/shorewall/shorewall.conf gives
the verbosity at which logging will occur. It uses the same
value range as VERBOSITY:
-1 Do not log
0 Almost quiet
1 Only major steps
2 Verbose
c) An absolute VERBOSITY may be specified on the command line
using the -v option followed by -1,0,1 or 2.
Example:
shorewall -v2 check
d) The /etc/init.d/shorewall script supplied with the
shorewall.net packages sets '-v0' as the default. This may be
overridden with the OPTIONS setting in /etc/defaults/shorewall or
/etc/sysconfig/shorewall.
Logging occurs on both Shorewall-perl and the generated script when
the following commands are issued:
start
restart
refresh
Messages in the log are always timestamped.
This change implemented two new options to the Shorewall-perl
compiler (/usr/share/shorewall-perl/compiler.pl).
--log=<logfile>
--log_verbosity={-1|0-2}
The --log option is ignored when --log_verbosity is not supplied or
is supplied with value -1.
To avoid a proliferation of parameters to
Shorewall::Compiler::compile(), that function has been changed to
use named parameters. Parameter names are:
object Object file. If omitted or '', the
configuration is syntax checked.
directory Directory. If omitted or '', configuration
files are located using
CONFIG_PATH. Otherwise, the directory named by
this parameter is searched first.
verbosity Verbosity; range -1 to 2
timestamp 0|1 -- timestamp messages.
debug 0|1 -- include stack trace in warning/error
messages.
export 0|1 -- compile for export.
chains List of chains to be reloaded by 'refresh'.
log File to log compiler messages to.
log_verbosity Log Verbosity; range -1 to 2.
Those parameters that are supplied must have defined values.
Defaults are:
object '' ('check' command)
directory ''
verbosity 1
timestamp 0
debug 0
export 0
chains ''
log ''
log_verbosity -1
Example:
use lib '/usr/share/shorewall-perl/';
use Shorewall::Compiler;
compiler( object => '/root/firewall',
log => '/root/compile.log',
log_verbosity => 2 );
7) Previously, when HIGH_ROUTE_MARKS=Yes, Shorewall allowed non-zero
mark values < 256 to be assigned in the OUTPUT chain. This has been
changed so that only high mark values may be assigned
there. Packet marking rules for traffic shaping of packets
originating on the firewall must be coded in the POSTROUTING table.
8) Previously, Shorewall did not range-check the value of the
VERBOSITY option in shorewall.conf. Beginning with Shorewall 4.1:
a) A VERBOSITY setting outside the range -1 through 2 is rejected.
b) After the -v and -q options are applied, the resulting value is
adjusted to fall within the range -1 through 2.
9) The tcdevices file has been extended to include an OPTIONS
column. Currently only a single option is defined.
classify When specified, you must use explicit CLASSIFY tcrules
to classify traffic by class. Shorewall will not create
any CLASSIFY rules to classify traffic by mark value.
The 'classify' option should be specified when you want to do all
classification using CLASSIFY tcrules. Because CLASSIFY is not a
terminating target, every packet passes through all CLASSIFY
rules. 'classify' can prevent packets from having to pass through
useless additional rules.
Example:
/etc/shorewall/tcdevices
#INTERFACE IN-BANDWITH OUT-BANDWIDTH OPTIONS
$EXT_IF 1300kbit 384kbit classify
/etc/shorewall/tcclasses
#INTERFACE MARK RATE CEIL PRIORITY OPTIONS
$EXT_IF 10 5*full/10 full 1 tcp-ack,tos-minimize-delay
$EXT_IF 20 2*full/10 6*full/10 2 default
$EXT_IF 30 2*full/10 6*full/10 3
/etc/shorewall/tcrules
#MARK SOURCE DEST PROTO PORT(S) SOURCE
# PORT(S)
1:110 192.168.0.0/22 $EXT_IF
1:130 206.124.146.177 $EXT_IF tcp - 873
This example shows my own simple traffic shaping configuration. I
have three classes; one for traffic from our local network, one for
rsync from the master shorewall.net server, and one for all other
DMZ traffic. I use CLASSIFY rules to assign traffic to the first
and third class and let the rest default to the second class.
10) COMMENT lines are now supported in macro bodies by Shorewall-perl
and are ignored by the Shorewall-shell compiler. The standard
macros (with the exception of macro.Drop and macro.Reject) have
been modified to include a COMMENT line describing the macro.
COMMENT lines in macros work slightly differently from COMMENT
lines in other files. COMMENT lines in macros are ignored if
COMMENT support is not available or if there was a COMMENT in use
when the top-level macro was invoked. This allows the
following:
/usr/share/shorewall/macro.SSH:
#ACTION SOURCE PROTO DEST SOURCE RATE USER/
# PORT(S) PORT(S) LIMIT GROUP
COMMENT SSH
PARAM - - tcp 22
/etc/shorewall/rules:
COMMENT Allow SSH from home
SSH/ALLOW net:$MYIP $FW
COMMENT
The comment line in macro.SSH will not override the
COMMENT line in the rules file and the generated rule will show
/* Allow SSH from home */
when displayed through the Shorewall show and dump commands.
11) If the program named in SHOREWALL_SHELL doesn't exist or is not
executable, Shorewall and Shorewall-lite now both fall back to
/bin/sh after issuing a warning message. Previously, both
terminated with a fatal error.
12) Shorewall-perl now generates fatal error conditions when there are
no IPv4 zones defined and when there are no interfaces defined.
13) Shorewall now unconditionally uses tc filter rules to classify
traffic by MARK value. Previously, Shorewall used the CLASSIFY
target in the POSTROUTING chain if it was available.
14) The Shorewall-common installer (install.sh) now works on Windows
under Cygwin.
To install Shorewall-perl under Cygwin:
$ tar -xf shorewall-perl-4.1.3.tar.bz2
$ tar -xf shorewall-common-4.1.3.tar.bz2
$ cd shorewall-perl-4.1.3
$ USER=<your user id> GROUP=None ./install.sh
$ cd ../shorewall-common-4.1.3
$ USER=<your user id> GROUP=None ./install.sh
The 'shorewall' program is installed in /bin/ (a.k.a, /usr/bin/).
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