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Add action.Invalid and action.NotSyn and modify action.Drop and action.Reject to use them

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Signed-off-by: Tom Eastep <teastep@shorewall.net>
This commit is contained in:
Tom Eastep 2011-07-03 17:14:36 -07:00
parent 1536ff4b92
commit 863881841a
5 changed files with 110 additions and 4 deletions
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4
Shorewall/action.Drop
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@ -79,7 +79,7 @@ AllowICMPs($4) - - icmp
# Drop packets that are in the INVALID state -- these are usually ICMP packets
# and just confuse people when they appear in the log.
#
dropInvalid($1)
Invalid(DROP,$1)
#
# Drop Microsoft noise so that it doesn't clutter up the log.
#
@ -88,7 +88,7 @@ DropUPnP($5)
#
# Drop 'newnotsyn' traffic so that it doesn't get logged.
#
dropNotSyn($1) - - tcp
NotSyn(DROP,$1) - - tcp
#
# Drop late-arriving DNS replies. These are just a nuisance and clutter up
# the log.

52
Shorewall/action.Invalid Normal file
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@ -0,0 +1,52 @@
#
# Shorewall 4 - Invalid Action
#
# /usr/share/shorewall/action.Invalid
#
# This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
#
# (c) 2011 - Tom Eastep (teastep@shorewall.net)
#
# Complete documentation is available at http://shorewall.net
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of Version 2 of the GNU General Public License
# as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Invalid[([<action>|-[,{audit|-}])]
#
# Default action is DROP
#
##########################################################################################
FORMAT 2
DEFAULTS DROP,-
BEGIN PERL;
use Shorewall::IPAddrs;
use Shorewall::Config;
use Shorewall::Chains;
my $chainref = get_action_chain;
my ( $action, $audit ) = get_action_params( 2 );
my ( $level, $tag ) = get_action_logging;
my $target = require_audit ( $action , $audit );
fatal_error "Invalid parameter to action Invalid" if supplied $audit && $audit ne 'audit';
log_rule_limit $level, $chainref, 'Invalid' , $action, '', $tag, 'add', "$globals{STATEMATCH} INVALID " if $level ne '';
add_jump $chainref , $target, 0, "$globals{STATEMATCH} INVALID ";
1;
END PERL;

52
Shorewall/action.NotSyn Normal file
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@ -0,0 +1,52 @@
#
# Shorewall 4 - NotSyn Action
#
# /usr/share/shorewall/action.NotSyn
#
# This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
#
# (c) 2011 - Tom Eastep (teastep@shorewall.net)
#
# Complete documentation is available at http://shorewall.net
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of Version 2 of the GNU General Public License
# as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# NotSyn[([<action>|-[,{audit|-}])]
#
# Default action is DROP
#
##########################################################################################
FORMAT 2
DEFAULTS DROP,-
BEGIN PERL;
use Shorewall::IPAddrs;
use Shorewall::Config;
use Shorewall::Chains;
my $chainref = get_action_chain;
my ( $action, $audit ) = get_action_params( 2 );
my ( $level, $tag ) = get_action_logging;
my $target = require_audit ( $action , $audit );
fatal_error "Invalid parameter to action NotSyn" if supplied $audit && $audit ne 'audit';
log_rule_limit $level, $chainref, 'NotSyn' , $action, '', $tag, 'add', '-p 6 ! --syn ' if $level ne '';
add_jump $chainref , $target, 0, '-p 6 ! --syn ';
1;
END PERL;

4
Shorewall/action.Reject
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@ -77,7 +77,7 @@ AllowICMPs($4) - - icmp
# and just confuse people when they appear in the log (these ICMPs cannot be
# rejected).
#
dropInvalid($1)
Invalid(DROP,$1)
#
# Reject Microsoft noise so that it doesn't clutter up the log.
#
@ -86,7 +86,7 @@ DropUPnP($5)
#
# Drop 'newnotsyn' traffic so that it doesn't get logged.
#
dropNotSyn($1) - - tcp
NotSyn(DROP,$1) - - tcp
#
# Drop late-arriving DNS replies. These are just a nuisance and clutter up
# the log.

2
Shorewall/actions.std
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@ -37,4 +37,6 @@ A_Drop # Audited Default Action for DROP policy
A_Reject # Audited Default action for REJECT policy
Broadcast # Handles Broadcast/Multicast/Anycast
Drop # Default Action for DROP policy
Invalid # Handles packets in the INVALID conntrack state
NotSyn # Handles TCP packets which do not have SYN=1 and ACK=0
Reject # Default Action for REJECT policy