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98 lines
2.5 KiB
Plaintext
98 lines
2.5 KiB
Plaintext
#
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# Shorewall version 4 - Drop Action
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#
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# /usr/share/shorewall/action.Drop
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#
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# The default DROP common rules
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#
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# This action is invoked before a DROP policy is enforced. The purpose
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# of the action is:
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#
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# a) Avoid logging lots of useless cruft.
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# b) Allow 'auth' requests rejected rejected, even if the policy is
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# DROP. Otherwise, you may experience problems establishing
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# connections with servers that use auth.
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# c) Ensure that certain ICMP packets that are necessary for successful
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# internet operation are always ACCEPTed.
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#
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# The action accepts five optional parameters:
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#
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# 1 - 'audit' or '-'. Default is '-' which means don't audit in builtin
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# actions.
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# 2 - Action to take with Auth requests. Default is to do nothing special
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# with them.
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# 3 - Action to take with SMB requests. Default is DROP or A_DROP,
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# depending on the setting of the first parameter.
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# 4 - Action to take with required ICMP packets. Default is ACCEPT or
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# A_ACCEPT depending on the first parameter.
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# 5 - Action to take with late UDP replies (UDP source port 53). Default
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# is DROP or A_DROP depending on the first parameter.
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#
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# IF YOU ARE HAVING CONNECTION PROBLEMS, CHANGING THIS FILE WON'T HELP!!!!!!!!!
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#
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###############################################################################
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?FORMAT 2
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#
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# The following magic provides different defaults for @2 thru @5, when @1 is
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# 'audit'.
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#
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?BEGIN PERL;
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use Shorewall::Config;
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my ( $p1, $p2, $p3 , $p4, $p5 ) = get_action_params( 5 );
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if ( defined $p1 ) {
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if ( $p1 eq 'audit' ) {
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set_action_param( 3, 'A_DROP') unless supplied $p3;
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set_action_param( 4, 'A_ACCEPT' ) unless supplied $p4;
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set_action_param( 5, 'A_DROP' ) unless supplied $p5;
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} else {
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fatal_error "Invalid value ($p1) for first Drop parameter" if supplied $p1;
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}
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}
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1;
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?END PERL;
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DEFAULTS -,-,DROP,ACCEPT,DROP
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#TARGET SOURCE DEST PROTO DPORT SPORT
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#
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# Count packets that come through here
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#
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COUNT
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#
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# Special Handling for Auth
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#
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?if @2 ne '-'
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Auth(@2)
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?endif
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#
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# Don't log broadcasts
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#
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Broadcast(DROP,@1)
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#
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# ACCEPT critical ICMP types
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#
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AllowICMPs(@4) - - icmp
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#
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# Drop packets that are in the INVALID state -- these are usually ICMP packets
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# and just confuse people when they appear in the log.
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#
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Invalid(DROP,@1)
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#
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# Drop Microsoft noise so that it doesn't clutter up the log.
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#
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SMB(@3)
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DropUPnP(@5)
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#
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# Drop 'newnotsyn' traffic so that it doesn't get logged.
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#
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NotSyn(DROP,@1) - - tcp
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#
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# Drop late-arriving DNS replies. These are just a nuisance and clutter up
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# the log.
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#
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DropDNSrep(@5)
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