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95 lines
2.5 KiB
Plaintext
95 lines
2.5 KiB
Plaintext
#
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# Shorewall version 4 - Reject Action
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#
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# /usr/share/shorewall/action.Reject
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#
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# The default REJECT action common rules
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#
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# This action is invoked before a REJECT 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 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 REJECT or A_REJECT,
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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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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( 2, 'A_REJECT') unless supplied $p2;
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set_action_param( 3, 'A_REJECT') 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 Reject 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 -,REJECT,REJECT,ACCEPT,DROP
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#TARGET SOURCE DEST PROTO
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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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# Don't log 'auth' -- REJECT
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#
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Auth($2)
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#
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# Drop Broadcasts so they don't clutter up the log
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# (broadcasts must *not* be rejected).
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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 (these ICMPs cannot be
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# rejected).
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#
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dropInvalid($1)
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#
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# Reject 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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