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99 lines
2.7 KiB
Plaintext
99 lines
2.7 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) Ensure that 'auth' requests are 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 REJECT or A_REJECT,
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# depending on the setting of the first parameter.
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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, $p6 ) = get_action_params( 6 );
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fatal_error "Too many parameters to Drop" if defined $p6;
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if ( defined $p1 ) {
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if ( $p1 eq 'audit' ) {
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set_action_param( 2, 'A_REJECT') unless defined( $p2 ) && $p2 ne '-';
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set_action_param( 3, 'A_DROP') unless defined( $p3 ) && $p3 ne '-';
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set_action_param( 4, 'A_ACCEPT' ) unless defined( $p4 ) && $p4 ne '-';
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set_action_param( 5, 'A_DROP' ) unless defined( $p5 ) && $p5 ne '-';
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} else {
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fatal_error "Invalid value ($p1) for first Drop parameter" unless $p1 eq '-';
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}
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}
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1;
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END PERL
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DEFAULTS -,REJECT,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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# Reject 'auth'
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#
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Auth($2)
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#
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# Don't log broadcasts
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#
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dropBcast($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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dropInvalid($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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dropNotSyn($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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