forked from extern/shorewall_code
a141478319
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@8372 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
869 lines
25 KiB
Perl
869 lines
25 KiB
Perl
#
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# Shorewall-perl 4.1 -- /usr/share/shorewall-perl/Shorewall/Actions.pm
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#
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# This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
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#
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# (c) 2007 - Tom Eastep (teastep@shorewall.net)
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#
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# Complete documentation is available at http://shorewall.net
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of Version 2 of the GNU General Public License
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# as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# This module contains the code for dealing with actions (built-in,
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# standard and user-defined) and Macros.
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#
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package Shorewall::Actions;
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require Exporter;
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use Shorewall::Config qw(:DEFAULT :internal);
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use Shorewall::Zones;
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use Shorewall::Chains qw(:DEFAULT :internal);
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use strict;
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our @ISA = qw(Exporter);
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our @EXPORT = qw( merge_levels
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isolate_basic_target
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get_target_param
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add_requiredby
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createactionchain
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find_logactionchain
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process_actions1
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process_actions2
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process_actions3
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find_macro
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split_action
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substitute_param
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merge_macro_source_dest
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merge_macro_column
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%usedactions
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%default_actions
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%actions
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%macros
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%macro_commands
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);
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our @EXPORT_OK = qw( initialize );
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our $VERSION = 4.1.1;
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#
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# Used Actions. Each action that is actually used has an entry with value 1.
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#
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our %usedactions;
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#
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# Default actions for each policy.
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#
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our %default_actions;
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# Action Table
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#
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# %actions{ <action1> => { requires => { <requisite1> = 1,
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# <requisite2> = 1,
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# ...
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# } ,
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# actchain => <action chain number> # Used for generating unique chain names for each <level>:<tag> pair.
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#
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our %actions;
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#
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# Contains an entry for each used <action>:<level>[:<tag>] that maps to the associated chain.
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#
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our %logactionchains;
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our %macros;
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#
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# Commands that can be embedded in a macro file and how many total tokens on the line (0 => unlimited).
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#
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our %macro_commands = ( COMMENT => 0, FORMAT => 2 );
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#
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# Initialize globals -- we take this novel approach to globals initialization to allow
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# the compiler to run multiple times in the same process. The
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# initialize() function does globals initialization for this
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# module and is called from an INIT block below. The function is
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# also called by Shorewall::Compiler::compiler at the beginning of
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# the second and subsequent calls to that function.
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#
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sub initialize() {
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%usedactions = ();
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%default_actions = ( DROP => 'none' ,
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REJECT => 'none' ,
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ACCEPT => 'none' ,
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QUEUE => 'none' );
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%actions = ();
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%logactionchains = ();
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}
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INIT {
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initialize;
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}
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#
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# This function determines the logging for a subordinate action or a rule within a superior action
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#
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sub merge_levels ($$) {
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my ( $superior, $subordinate ) = @_;
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my @supparts = split /:/, $superior;
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my @subparts = split /:/, $subordinate;
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my $subparts = @subparts;
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my $target = $subparts[0];
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push @subparts, '' while @subparts < 3; #Avoid undefined values
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my $level = $supparts[1];
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my $tag = $supparts[2];
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if ( @supparts == 3 ) {
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return "$target:none!:$tag" if $level eq 'none!';
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return "$target:$level:$tag" if $level =~ /!$/;
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return $subordinate if $subparts >= 2;
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return "$target:$level:$tag";
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}
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if ( @supparts == 2 ) {
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return "$target:none!" if $level eq 'none!';
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return "$target:$level" if ($level =~ /!$/) || ($subparts < 2);
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}
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$subordinate;
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}
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#
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# Try to find a macro file -- RETURNS false if the file doesn't exist or MACRO if it does.
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# If the file exists, the macro is entered into the 'targets' table and the fully-qualified
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# name of the file is stored in the 'macro' table.
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#
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sub find_macro( $ )
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{
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my $macro = $_[0];
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my $macrofile = find_file "macro.$macro";
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if ( -f $macrofile ) {
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$macros{$macro} = $macrofile;
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$targets{$macro} = MACRO;
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} else {
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0;
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}
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}
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#
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# Return ( action, level[:tag] ) from passed full action
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#
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sub split_action ( $ ) {
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my $action = $_[0];
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my @a = split( /:/ , $action, 4 );
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fatal_error "Invalid ACTION ($action)" if ( $action =~ /::/ ) || ( @a > 3 );
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( shift @a, join ":", @a );
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}
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#
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# This function substitutes the second argument for the first part of the first argument up to the first colon (":")
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#
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# Example:
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#
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# substitute_param DNAT PARAM:info:FTP
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#
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# produces "DNAT:info:FTP"
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#
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sub substitute_param( $$ ) {
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my ( $param, $action ) = @_;
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if ( $action =~ /:/ ) {
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my $logpart = (split_action $action)[1];
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$logpart =~ s!/$!!;
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return "$param:$logpart";
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}
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$param;
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}
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#
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# Combine fields from a macro body with one from the macro invocation
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#
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sub merge_macro_source_dest( $$ ) {
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my ( $body, $invocation ) = @_;
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if ( $invocation ) {
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if ( $body ) {
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return $body if $invocation eq '-';
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return "$body:$invocation" if $invocation =~ /.*?\.*?\.|^\+|^~|^!~/;
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return "$invocation:$body";
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}
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return $invocation;
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}
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$body || '';
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}
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sub merge_macro_column( $$ ) {
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my ( $body, $invocation ) = @_;
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if ( defined $invocation && $invocation ne '' && $invocation ne '-' ) {
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$invocation;
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} else {
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$body;
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}
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}
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#
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# Get Macro Name -- strips away trailing /* and :* from the first column in a rule, macro or action.
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#
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sub isolate_basic_target( $ ) {
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my $target = ( split '[/:]', $_[0])[0];
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$target =~ /^(\w+)[(].*[)]$/ ? $1 : $target;
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}
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#
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# Split the passed target into the basic target and parameter
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#
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sub get_target_param( $ ) {
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my ( $target, $param ) = split '/', $_[0];
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unless ( defined $param ) {
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( $target, $param ) = ( $1, $2 ) if $target =~ /^(.*?)[(](.*)[)]$/;
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}
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( $target, $param );
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}
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#
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# Define an Action
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#
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sub new_action( $ ) {
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my $action = $_[0];
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$actions{$action} = { actchain => '', requires => {} };
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}
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#
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# Record a 'requires' relationship between a pair of actions.
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#
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sub add_requiredby ( $$ ) {
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my ($requiredby , $requires ) = @_;
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$actions{$requires}{requires}{$requiredby} = 1;
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}
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#
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# Create and record a log action chain -- Log action chains have names
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# that are formed from the action name by prepending a "%" and appending
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# a 1- or 2-digit sequence number. In the functions that follow,
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# the CHAIN, LEVEL and TAG variable serves as arguments to the user's
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# exit. We call the exit corresponding to the name of the action but we
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# set CHAIN to the name of the iptables chain where rules are to be added.
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# Similarly, LEVEL and TAG contain the log level and log tag respectively.
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#
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# The maximum length of a chain name is 30 characters -- since the log
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# action chain name is 2-3 characters longer than the base chain name,
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# this function truncates the original chain name where necessary before
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# it adds the leading "%" and trailing sequence number.
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#
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sub createlogactionchain( $$ ) {
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my ( $action, $level ) = @_;
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my $chain = $action;
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my $actionref = $actions{$action};
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my $chainref;
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my ($lev, $tag) = split ':', $level;
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validate_level $lev;
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$actionref = new_action $action unless $actionref;
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$chain = substr $chain, 0, 28 if ( length $chain ) > 28;
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CHECKDUP:
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{
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$actionref->{actchain}++ while $chain_table{filter}{'%' . $chain . $actionref->{actchain}};
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$chain = substr( $chain, 0, 27 ), redo CHECKDUP if ( $actionref->{actchain} || 0 ) >= 10 and length $chain == 28;
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}
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$logactionchains{"$action:$level"} = $chainref = new_standard_chain '%' . $chain . $actionref->{actchain}++;
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fatal_error "Too many invocations of Action $action" if $actionref->{actchain} > 99;
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unless ( $targets{$action} & STANDARD ) {
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my $file = find_file $chain;
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if ( -f $file ) {
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progress_message "Processing $file...";
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( $level, my $tag ) = split /:/, $level;
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$tag = $tag || '';
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unless ( my $return = eval `cat $file` ) {
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fatal_error "Couldn't parse $file: $@" if $@;
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fatal_error "Couldn't do $file: $!" unless defined $return;
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fatal_error "Couldn't run $file" unless $return;
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}
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}
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}
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}
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sub createsimpleactionchain( $ ) {
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my $action = shift;
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my $chainref = new_standard_chain $action;
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$logactionchains{"$action:none"} = $chainref;
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unless ( $targets{$action} & STANDARD ) {
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my $file = find_file $action;
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if ( -f $file ) {
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progress_message "Processing $file...";
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my ( $level, $tag ) = ( '', '' );
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unless ( my $return = eval `cat $file` ) {
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fatal_error "Couldn't parse $file: $@" if $@;
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fatal_error "Couldn't do $file: $!" unless defined $return;
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fatal_error "Couldn't run $file" unless $return;
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}
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}
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}
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}
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#
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# Create an action chain and run it's associated user exit
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#
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sub createactionchain( $ ) {
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my ( $action , $level ) = split_action $_[0];
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my $chainref;
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if ( defined $level && $level ne '' ) {
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if ( $level eq 'none' ) {
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createsimpleactionchain $action;
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} else {
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createlogactionchain $action , $level;
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}
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} else {
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createsimpleactionchain $action;
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}
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}
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#
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# Find the chain that handles the passed action. If the chain cannot be found,
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# a fatal error is generated and the function does not return.
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#
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sub find_logactionchain( $ ) {
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my $fullaction = $_[0];
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my ( $action, $level ) = split_action $fullaction;
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$level = 'none' unless $level;
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fatal_error "Fatal error in find_logactionchain" unless $logactionchains{"$action:$level"};
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}
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#
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# The functions process_actions1-3() implement the three phases of action processing.
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#
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# The first phase (process_actions1) occurs before the rules file is processed. ${SHAREDIR}/actions.std
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# and ${CONFDIR}/actions are scanned (in that order) and for each action:
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#
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# a) The related action definition file is located and scanned.
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# b) Forward and unresolved action references are trapped as errors.
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# c) A dependency graph is created using the 'requires' field in the 'actions' table.
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#
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# As the rules file is scanned, each action[:level[:tag]] is merged onto the 'usedactions' hash. When an <action>
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# is merged into the hash, its action chain is created. Where logging is specified, a chain with the name
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# %<action>n is used where the <action> name is truncated on the right where necessary to ensure that the total
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# length of the chain name does not exceed 30 characters.
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#
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# The second phase (process_actions2) occurs after the rules file is scanned. The transitive closure of
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# %usedactions is generated; again, as new actions are merged into the hash, their action chains are created.
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#
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# The final phase (process_actions3) is to traverse the keys of %usedactions populating each chain appropriately
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# by reading the action definition files and creating rules. Note that a given action definition file is
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# processed once for each unique [:level[:tag]] applied to an invocation of the action.
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#
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sub process_macro1 ( $$ ) {
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my ( $action, $macrofile ) = @_;
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progress_message " ..Expanding Macro $macrofile...";
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push_open( $macrofile );
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while ( read_a_line ) {
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my ( $mtarget, $msource, $mdest, $mproto, $mports, $msports, $morigdest, $mrate, $muser ) = split_line1 1, 9, 'macro file', \%macro_commands;
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next if $mtarget eq 'COMMENT' || $mtarget eq 'FORMAT';
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$mtarget =~ s/:.*$//;
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$mtarget = (split '/' , $mtarget)[0];
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my $targettype = $targets{$mtarget};
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$targettype = 0 unless defined $targettype;
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fatal_error "Invalid target ($mtarget)"
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unless ( $targettype == STANDARD ) || ( $mtarget eq 'PARAM' ) || ( $targettype & ( LOGRULE | NFQ | CHAIN ) );
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}
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progress_message " ..End Macro $macrofile";
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pop_open;
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}
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sub process_action1 ( $$ ) {
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my ( $action, $wholetarget ) = @_;
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my ( $target, $level ) = split_action $wholetarget;
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$level = 'none' unless $level;
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my $targettype = $targets{$target};
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if ( defined $targettype ) {
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return if ( $targettype == STANDARD ) || ( $targettype & ( MACRO | LOGRULE | NFQ | CHAIN ) );
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fatal_error "Invalid TARGET ($target)" if $targettype & STANDARD;
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fatal_error "An action may not invoke itself" if $target eq $action;
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add_requiredby $wholetarget, $action if $targettype & ACTION;
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} elsif ( $target eq 'COMMENT' ) {
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fatal_error "Invalid TARGET ($wholetarget)" unless $wholetarget eq $target;
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} else {
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( $target, my $param ) = get_target_param $target;
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return if $target eq 'NFQUEUE';
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if ( defined $param ) {
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my $paramtype = $targets{$param} || 0;
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fatal_error "Parameter value not allowed in action files ($param)" if $paramtype & NATRULE;
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}
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fatal_error "Invalid or missing ACTION ($wholetarget)" unless defined $target;
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if ( find_macro $target ) {
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process_macro1( $action, $macros{$target} );
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} else {
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fatal_error "Invalid TARGET ($target)";
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}
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}
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}
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sub process_actions1() {
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progress_message2 "Preprocessing Action Files...";
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for my $act ( grep $targets{$_} & ACTION , keys %targets ) {
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new_action $act;
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}
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for my $file ( qw/actions.std actions/ ) {
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open_file $file;
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while ( read_a_line ) {
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my ( $action ) = split_line 1, 1, 'action file';
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if ( $action =~ /:/ ) {
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warning_message 'Default Actions are now specified in /etc/shorewall/shorewall.conf';
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$action =~ s/:.*$//;
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}
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next unless $action;
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if ( $targets{$action} ) {
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warning_message "Duplicate Action Name ($action) Ignored" unless $targets{$action} & ACTION;
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next;
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}
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$targets{$action} = ACTION;
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fatal_error "Invalid Action Name ($action)" unless "\L$action" =~ /^[a-z]\w*$/;
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new_action $action;
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my $actionfile = find_file "action.$action";
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fatal_error "Missing Action File ($actionfile)" unless -f $actionfile;
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progress_message2 " Pre-processing $actionfile...";
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push_open( $actionfile );
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while ( read_a_line ) {
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my ($wholetarget, $source, $dest, $proto, $ports, $sports, $rate, $users ) = split_line 1, 8, 'action file';
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process_action1( $action, $wholetarget );
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}
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pop_open;
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}
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}
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}
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sub process_actions2 () {
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progress_message2 'Generating Transitive Closure of Used-action List...';
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my $changed = 1;
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while ( $changed ) {
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$changed = 0;
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for my $target (keys %usedactions) {
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my ($action, $level) = split_action $target;
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my $actionref = $actions{$action};
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fatal_error "Null Action Reference in process_actions2" unless $actionref;
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for my $action1 ( keys %{$actionref->{requires}} ) {
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my $action2 = merge_levels $target, $action1;
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unless ( $usedactions{ $action2 } ) {
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$usedactions{ $action2 } = 1;
|
|
createactionchain $action2;
|
|
$changed = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#
|
|
# This function is called to process each rule generated from an action file.
|
|
#
|
|
sub process_action( $$$$$$$$$$ ) {
|
|
my ($chainref, $actionname, $target, $source, $dest, $proto, $ports, $sports, $rate, $user ) = @_;
|
|
|
|
my ( $action , $level ) = split_action $target;
|
|
|
|
if ( $action eq 'REJECT' ) {
|
|
$action = 'reject';
|
|
} elsif ( $action eq 'CONTINUE' ) {
|
|
$action = 'RETURN';
|
|
} elsif ( $action =~ /^NFQUEUE/ ) {
|
|
( $action, my $param ) = get_target_param $action;
|
|
$param = 1 unless defined $param;
|
|
$action = "NFQUEUE --queue-num $param";
|
|
}
|
|
|
|
expand_rule ( $chainref ,
|
|
NO_RESTRICT ,
|
|
do_proto( $proto, $ports, $sports ) . do_ratelimit( $rate, $action ) . do_user $user ,
|
|
$source ,
|
|
$dest ,
|
|
'', #Original Dest
|
|
"-j $action" ,
|
|
$level ,
|
|
$action ,
|
|
'' );
|
|
}
|
|
|
|
#
|
|
# Expand Macro in action files.
|
|
#
|
|
sub process_macro3( $$$$$$$$$$$ ) {
|
|
my ( $macro, $param, $chainref, $action, $source, $dest, $proto, $ports, $sports, $rate, $user ) = @_;
|
|
|
|
my $nocomment = no_comment;
|
|
|
|
my $format = 1;
|
|
|
|
macro_comment $macro;
|
|
|
|
my $fn = $macros{$macro};
|
|
|
|
progress_message "..Expanding Macro $fn...";
|
|
|
|
push_open $fn;
|
|
|
|
while ( read_a_line ) {
|
|
|
|
my ( $mtarget, $msource, $mdest, $mproto, $mports, $msports, $morigdest, $mrate, $muser );
|
|
|
|
if ( $format == 1 ) {
|
|
( $mtarget, $msource, $mdest, $mproto, $mports, $msports, $mrate, $muser, $morigdest ) = split_line1 1, 9, 'macro file', \%macro_commands;
|
|
} else {
|
|
( $mtarget, $msource, $mdest, $mproto, $mports, $msports, $morigdest, $mrate, $muser ) = split_line1 1, 9, 'macro file', \%macro_commands;
|
|
}
|
|
|
|
if ( $mtarget eq 'COMMENT' ) {
|
|
process_comment unless $nocomment;
|
|
next;
|
|
}
|
|
|
|
if ( $mtarget eq 'FORMAT' ) {
|
|
fatal_error "Invalid FORMAT ($msource)" unless $msource =~ /^[12]$/;
|
|
$format = $msource;
|
|
next;
|
|
}
|
|
|
|
fatal_error "Invalid macro file entry (too many columns)" if $morigdest ne '-' && $format == 1;
|
|
|
|
if ( $mtarget =~ /^PARAM:?/ ) {
|
|
fatal_error 'PARAM requires that a parameter be supplied in macro invocation' unless $param;
|
|
$mtarget = substitute_param $param, $mtarget;
|
|
}
|
|
|
|
fatal_error "Macros used within Actions may not specify an ORIGINAL DEST " if $morigdest ne '-';
|
|
|
|
if ( $msource ) {
|
|
if ( ( $msource eq '-' ) || ( $msource eq 'SOURCE' ) ) {
|
|
$msource = $source || '';
|
|
} elsif ( $msource eq 'DEST' ) {
|
|
$msource = $dest || '';
|
|
} else {
|
|
$msource = merge_macro_source_dest $msource, $source;
|
|
}
|
|
} else {
|
|
$msource = '';
|
|
}
|
|
|
|
$msource = '' if $msource eq '-';
|
|
|
|
if ( $mdest ) {
|
|
if ( ( $mdest eq '-' ) || ( $mdest eq 'DEST' ) ) {
|
|
$mdest = $dest || '';
|
|
} elsif ( $mdest eq 'SOURCE' ) {
|
|
$mdest = $source || '';
|
|
} else {
|
|
$mdest = merge_macro_source_dest $mdest, $dest;
|
|
}
|
|
} else {
|
|
$mdest = '';
|
|
}
|
|
|
|
$mdest = '' if $mdest eq '-';
|
|
|
|
$mproto = merge_macro_column $mproto, $proto;
|
|
$mports = merge_macro_column $mports, $ports;
|
|
$msports = merge_macro_column $msports, $sports;
|
|
$mrate = merge_macro_column $mrate, $rate;
|
|
$muser = merge_macro_column $muser, $user;
|
|
|
|
process_action $chainref, $action, $mtarget, $msource, $mdest, $mproto, $mports, $msports, $mrate, $muser;
|
|
}
|
|
|
|
pop_open;
|
|
|
|
progress_message '..End Macro';
|
|
|
|
clear_comment unless $nocomment;
|
|
}
|
|
|
|
#
|
|
# Generate chain for non-builtin action invocation
|
|
#
|
|
sub process_action3( $$$$$ ) {
|
|
my ( $chainref, $wholeaction, $action, $level, $tag ) = @_;
|
|
my $actionfile = find_file "action.$action";
|
|
|
|
fatal_error "Missing Action File ($actionfile)" unless -f $actionfile;
|
|
|
|
progress_message2 "Processing $actionfile for chain $chainref->{name}...";
|
|
|
|
open_file $actionfile;
|
|
|
|
while ( read_a_line ) {
|
|
|
|
my ($target, $source, $dest, $proto, $ports, $sports, $rate, $user ) = split_line1 1, 8, 'action file';
|
|
|
|
if ( $target eq 'COMMENT' ) {
|
|
process_comment;
|
|
next;
|
|
}
|
|
|
|
my $target2 = merge_levels $wholeaction, $target;
|
|
|
|
my ( $action2 , $level2 ) = split_action $target2;
|
|
|
|
( $action2 , my $param ) = get_target_param $action2;
|
|
|
|
my $action2type = $targets{$action2} || 0;
|
|
|
|
unless ( $action2type == STANDARD ) {
|
|
if ( $action2type & ACTION ) {
|
|
$target2 = (find_logactionchain ( $target = $target2 ))->{name};
|
|
} else {
|
|
fatal_error "Internal Error" unless $action2type & ( MACRO | LOGRULE | NFQ | CHAIN );
|
|
}
|
|
}
|
|
|
|
if ( $action2type == MACRO ) {
|
|
process_macro3( $action2, $param, $chainref, $action, $source, $dest, $proto, $ports, $sports, $rate, $user );
|
|
} else {
|
|
process_action $chainref, $action, $target2, $source, $dest, $proto, $ports, $sports, $rate, $user;
|
|
}
|
|
}
|
|
|
|
clear_comment;
|
|
}
|
|
|
|
sub process_actions3 () {
|
|
#
|
|
# The following small functions generate rules for the builtin actions of the same name
|
|
#
|
|
sub dropBcast( $$$ ) {
|
|
my ($chainref, $level, $tag) = @_;
|
|
|
|
if ( $capabilities{ADDRTYPE} ) {
|
|
if ( $level ne '' ) {
|
|
log_rule_limit $level, $chainref, 'dropBcast' , 'DROP', '', $tag, 'add', ' -m addrtype --dst-type BROADCAST ';
|
|
log_rule_limit $level, $chainref, 'dropBcast' , 'DROP', '', $tag, 'add', ' -d 224.0.0.0/4 ';
|
|
}
|
|
|
|
add_rule $chainref, '-m addrtype --dst-type BROADCAST -j DROP';
|
|
} else {
|
|
add_command $chainref, 'for address in $ALL_BCASTS; do';
|
|
incr_cmd_level $chainref;
|
|
log_rule_limit $level, $chainref, 'dropBcast' , 'DROP', '', $tag, 'add', ' -d $address ' if $level ne '';
|
|
add_rule $chainref, '-d $address -j DROP';
|
|
decr_cmd_level $chainref;
|
|
add_command $chainref, 'done';
|
|
|
|
log_rule_limit $level, $chainref, 'dropBcast' , 'DROP', '', $tag, 'add', ' -d 224.0.0.0/4 ' if $level ne '';
|
|
}
|
|
|
|
add_rule $chainref, '-d 224.0.0.0/4 -j DROP';
|
|
}
|
|
|
|
sub allowBcast( $$$ ) {
|
|
my ($chainref, $level, $tag) = @_;
|
|
|
|
if ( $capabilities{ADDRTYPE} ) {
|
|
if ( $level ne '' ) {
|
|
log_rule_limit $level, $chainref, 'allowBcast' , 'ACCEPT', '', $tag, 'add', ' -m addrtype --dst-type BROADCAST ';
|
|
log_rule_limit $level, $chainref, 'allowBcast' , 'ACCEPT', '', $tag, 'add', ' -d 224.0.0.0/4 ';
|
|
}
|
|
|
|
add_rule $chainref, '-m addrtype --dst-type BROADCAST -j ACCEPT';
|
|
} else {
|
|
add_command $chainref, 'for address in $ALL_BCASTS; do';
|
|
incr_cmd_level $chainref;
|
|
log_rule_limit $level, $chainref, 'allowBcast' , 'ACCEPT', '', $tag, 'add', ' -d $address ' if $level ne '';
|
|
add_rule $chainref, '-d $address -j ACCEPT';
|
|
decr_cmd_level $chainref;
|
|
add_command $chainref, 'done';
|
|
|
|
log_rule_limit $level, $chainref, 'allowBcast' , 'ACCEPT', '', $tag, 'add', ' -d 224.0.0.0/4 ' if $level ne '';
|
|
}
|
|
add_rule $chainref, '-d 224.0.0.0/4 -j ACCEPT';
|
|
}
|
|
|
|
sub dropNotSyn ( $$$ ) {
|
|
my ($chainref, $level, $tag) = @_;
|
|
|
|
log_rule_limit $level, $chainref, 'dropNotSyn' , 'DROP', '', $tag, 'add', '-p tcp ! --syn ' if $level ne '';
|
|
add_rule $chainref , '-p tcp ! --syn -j DROP';
|
|
}
|
|
|
|
sub rejNotSyn ( $$$ ) {
|
|
my ($chainref, $level, $tag) = @_;
|
|
|
|
log_rule_limit $level, $chainref, 'rejNotSyn' , 'REJECT', '', $tag, 'add', '-p tcp ! --syn ' if $level ne '';
|
|
add_rule $chainref , '-p tcp ! --syn -j REJECT --reject-with tcp-reset';
|
|
}
|
|
|
|
sub dropInvalid ( $$$ ) {
|
|
my ($chainref, $level, $tag) = @_;
|
|
|
|
log_rule_limit $level, $chainref, 'dropInvalid' , 'DROP', '', $tag, 'add', '-m state --state INVALID ' if $level ne '';
|
|
add_rule $chainref , '-m state --state INVALID -j DROP';
|
|
}
|
|
|
|
sub allowInvalid ( $$$ ) {
|
|
my ($chainref, $level, $tag) = @_;
|
|
|
|
log_rule_limit $level, $chainref, 'allowInvalid' , 'ACCEPT', '', $tag, 'add', '-m state --state INVALID ' if $level ne '';
|
|
add_rule $chainref , '-m state --state INVALID -j ACCEPT';
|
|
}
|
|
|
|
sub forwardUPnP ( $$$ ) {
|
|
}
|
|
|
|
sub allowinUPnP ( $$$ ) {
|
|
my ($chainref, $level, $tag) = @_;
|
|
|
|
if ( $level ne '' ) {
|
|
log_rule_limit $level, $chainref, 'allowinUPnP' , 'ACCEPT', '', $tag, 'add', '-p udp --dport 1900 ';
|
|
log_rule_limit $level, $chainref, 'allowinUPnP' , 'ACCEPT', '', $tag, 'add', '-p tcp --dport 49152 ';
|
|
}
|
|
|
|
add_rule $chainref, '-p udp --dport 1900 -j ACCEPT';
|
|
add_rule $chainref, '-p tcp --dport 49152 -j ACCEPT';
|
|
}
|
|
|
|
sub Limit( $$$ ) {
|
|
my ($chainref, $level, $tag) = @_;
|
|
|
|
my @tag = split /,/, $tag;
|
|
|
|
fatal_error 'Limit rules must include <set name>,<max connections>,<interval> as the log tag (' . join( ':', 'Limit', $level eq '' ? 'none' : $level , $tag ) . ')' unless @tag == 3;
|
|
|
|
my $set = $tag[0];
|
|
|
|
for ( @tag[1,2] ) {
|
|
fatal_error 'Max connections and interval in Limit rules must be numeric (' . join( ':', 'Limit', $level eq '' ? 'none' : $level, $tag ) . ')' unless /^\d+$/
|
|
}
|
|
|
|
my $count = $tag[1] + 1;
|
|
|
|
require_capability( 'RECENT_MATCH' , 'Limit rules' , '' );
|
|
|
|
add_rule $chainref, "-m recent --name $set --set";
|
|
|
|
if ( $level ne '' ) {
|
|
my $xchainref = new_chain 'filter' , "$chainref->{name}%";
|
|
log_rule_limit $level, $xchainref, $tag[0], 'DROP', '', '', 'add', '';
|
|
add_rule $xchainref, '-j DROP';
|
|
add_rule $chainref, "-m recent --name $set --update --seconds $tag[2] --hitcount $count -j $xchainref->{name}";
|
|
} else {
|
|
add_rule $chainref, "-m recent --update --name $set --seconds $tag[2] --hitcount $count -j DROP";
|
|
}
|
|
|
|
add_rule $chainref, '-j ACCEPT';
|
|
}
|
|
|
|
my %builtinops = ( 'dropBcast' => \&dropBcast,
|
|
'allowBcast' => \&allowBcast,
|
|
'dropNotSyn' => \&dropNotSyn,
|
|
'rejNotSyn' => \&rejNotSyn,
|
|
'dropInvalid' => \&dropInvalid,
|
|
'allowInvalid' => \&allowInvalid,
|
|
'allowinUPnP' => \&allowinUPnP,
|
|
'forwardUPnP' => \&forwardUPnP,
|
|
'Limit' => \&Limit, );
|
|
|
|
for my $wholeaction ( keys %usedactions ) {
|
|
my $chainref = find_logactionchain $wholeaction;
|
|
my ( $action, $level, $tag ) = split /:/, $wholeaction;
|
|
|
|
$level = '' unless defined $level;
|
|
$tag = '' unless defined $tag;
|
|
|
|
if ( $targets{$action} & BUILTIN ) {
|
|
$level = '' if $level =~ /none!?/;
|
|
$builtinops{$action}->($chainref, $level, $tag);
|
|
} else {
|
|
process_action3 $chainref, $wholeaction, $action, $level, $tag;
|
|
}
|
|
}
|
|
}
|
|
|
|
1;
|