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shorewall_code/Shorewall6/action.Reject
Tom Eastep ee467a4877 Allow embedded shell/Perl directives to have leading '?'
Signed-off-by: Tom Eastep <teastep@shorewall.net>
2012-06-05 07:32:43 -07:00

91 lines
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#
# Shorewall6 version 4 - Reject Action
#
# /usr/share/shorewall6/action.Reject
#
# The default REJECT action common rules
#
# This action is invoked before a REJECT policy is enforced. The purpose
# of the action is:
#
# a) Avoid logging lots of useless cruft.
# b) Ensure that certain ICMP packets that are necessary for successful
# internet operation are always ACCEPTed.
#
# The action accepts five optional parameters:
#
# 1 - 'audit' or '-'. Default is '-' which means don't audit in builtin
# actions.
# 2 - Action to take with Auth requests. Default is REJECT or A_REJECT,
# depending on the setting of the first parameter.
# 3 - Action to take with SMB requests. Default is REJECT or A_REJECT,
# depending on the setting of the first parameter.
# 4 - Action to take with required ICMP packets. Default is ACCEPT or
# A_ACCEPT depending on the first parameter.
# 5 - Action to take with late UDP replies (UDP source port 53). Default
# is DROP or A_DROP depending on the first parameter.
#
# IF YOU ARE HAVING CONNECTION PROBLEMS, CHANGING THIS FILE WON'T HELP!!!!!!!!!
###############################################################################
FORMAT 2
#
# The following magic provides different defaults for $2 thru $5, when $1 is
# 'audit'.
#
?BEGIN PERL;
use Shorewall::Config;
my ( $p1, $p2, $p3 , $p4, $p5 ) = get_action_params( 5 );
if ( defined $p1 ) {
if ( $p1 eq 'audit' ) {
set_action_param( 2, 'A_REJECT') unless supplied $p2;
set_action_param( 3, 'A_REJECT') unless supplied $p3;
set_action_param( 4, 'A_ACCEPT' ) unless supplied $p4;
set_action_param( 5, 'A_DROP' ) unless supplied $p5;
} else {
fatal_error "Invalid value ($p1) for first Reject parameter" if supplied $p1;
}
}
1;
?END PERL;
DEFAULTS -,REJECT,REJECT,ACCEPT,DROP
#TARGET SOURCE DEST PROTO
#
# Don't log 'auth' -- REJECT
#
Auth($2)
#
# Drop Multicasts so they don't clutter up the log
# (broadcasts must *not* be rejected).
#
AllowICMPs($4) - - ipv6-icmp
#
# Drop Broadcasts so they don't clutter up the log
# (broadcasts must *not* be rejected).
#
Broadcast(DROP,$1)
#
# Drop packets that are in the INVALID state -- these are usually ICMP packets
# and just confuse people when they appear in the log (these ICMPs cannot be
# rejected).
#
Invalid(DROP,$1)
#
# Reject Microsoft noise so that it doesn't clutter up the log.
#
SMB($3)
#
# Drop 'newnotsyn' traffic so that it doesn't get logged.
#
NotSyn(DROP,$1) - - tcp
#
# Drop late-arriving DNS replies. These are just a nuisance and clutter up
# the log.
#
DropDNSrep($5)