2 ###############################################################################
4 # IPFire.org - A linux based firewall #
5 # Copyright (C) 2007-2020 IPFire Team <info@ipfire.org> #
7 # This program is free software: you can redistribute it and/or modify #
8 # it under the terms of the GNU General Public License as published by #
9 # the Free Software Foundation, either version 3 of the License, or #
10 # (at your option) any later version. #
12 # This program is distributed in the hope that it will be useful, #
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of #
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
15 # GNU General Public License for more details. #
17 # You should have received a copy of the GNU General Public License #
18 # along with this program. If not, see <http://www.gnu.org/licenses/>. #
20 ###############################################################################
23 use experimental
'smartmatch';
25 require '/var/ipfire/general-functions.pl';
26 require "${General::swroot}/lang.pl";
27 require "/usr/lib/firewall/firewall-lib.pl";
28 require "${General::swroot}/location-functions.pl";
30 # Set to one to enable debugging mode.
33 my $IPTABLES = "iptables --wait";
37 my $CHAIN_INPUT = "INPUTFW";
38 my $CHAIN_FORWARD = "FORWARDFW";
39 my $CHAIN_OUTPUT = "OUTGOINGFW";
40 my $CHAIN = $CHAIN_FORWARD;
41 my $CHAIN_NAT_SOURCE = "NAT_SOURCE";
42 my $CHAIN_NAT_DESTINATION = "NAT_DESTINATION";
43 my $CHAIN_MANGLE_NAT_DESTINATION_FIX = "NAT_DESTINATION";
44 my @VALID_CHAINS = ($CHAIN_INPUT, $CHAIN_FORWARD, $CHAIN_OUTPUT);
45 my @ANY_ADDRESSES = ("0.0.0.0/0.0.0.0", "0.0.0.0/0", "0/0");
47 my @PROTOCOLS = ("tcp", "udp", "icmp", "igmp", "ah", "esp", "gre", "ipv6", "ipip");
48 my @PROTOCOLS_WITH_PORTS = ("tcp", "udp");
50 my @VALID_TARGETS = ("ACCEPT", "DROP", "REJECT");
52 my @PRIVATE_NETWORKS = (
60 my $NAT_MASK = 0x0f000000;
62 # Country code, which is used to mark hostile networks.
63 my $HOSTILE_CCODE = "XD";
67 my %defaultNetworks=();
71 my %configoutgoingfw=();
73 my %locationsettings = (
74 "LOCATIONBLOCK_ENABLED" => "off"
76 my %ipset_loaded_sets = ();
77 my @ipset_used_sets = ();
79 my $configfwdfw = "${General::swroot}/firewall/config";
80 my $configinput = "${General::swroot}/firewall/input";
81 my $configoutgoing = "${General::swroot}/firewall/outgoing";
82 my $locationfile = "${General::swroot}/firewall/locationblock";
83 my $configgrp = "${General::swroot}/fwhosts/customgroups";
84 my $netsettings = "${General::swroot}/ethernet/settings";
86 &General
::readhash
("${General::swroot}/firewall/settings", \
%fwdfwsettings);
87 &General
::readhash
("${General::swroot}/optionsfw/settings", \
%fwoptions);
88 &General
::readhash
("$netsettings", \
%defaultNetworks);
89 &General
::readhasharray
($configfwdfw, \
%configfwdfw);
90 &General
::readhasharray
($configinput, \
%configinputfw);
91 &General
::readhasharray
($configoutgoing, \
%configoutgoingfw);
92 &General
::readhasharray
($configgrp, \
%customgrp);
94 # Check if the location settings file exists
95 if (-e
"$locationfile") {
97 &General
::readhash
("$locationfile", \
%locationsettings);
100 # Get all available locations.
101 my @locations = &Location
::Functions
::get_locations
();
103 # Name or the RED interface.
104 my $RED_DEV = &General
::get_red_interface
();
106 my @log_limit_options = &make_log_limit_options
();
108 my $POLICY_INPUT_ALLOWED = 0;
109 my $POLICY_FORWARD_ALLOWED = ($fwdfwsettings{"POLICY"} eq "MODE2");
110 my $POLICY_OUTPUT_ALLOWED = ($fwdfwsettings{"POLICY1"} eq "MODE2");
112 my $POLICY_INPUT_ACTION = $fwoptions{"FWPOLICY2"};
113 my $POLICY_FORWARD_ACTION = $fwoptions{"FWPOLICY"};
114 my $POLICY_OUTPUT_ACTION = $fwoptions{"FWPOLICY1"};
116 #workaround to suppress a warning when a variable is used only once
117 my @dummy = ( $Location::Functions
::ipset_db_directory
);
124 # Get currently used ipset sets.
130 # Prepare firewall rules.
131 if (! -z
"${General::swroot}/firewall/input"){
132 &buildrules
(\
%configinputfw);
134 if (! -z
"${General::swroot}/firewall/outgoing"){
135 &buildrules
(\
%configoutgoingfw);
137 if (! -z
"${General::swroot}/firewall/config"){
138 &buildrules
(\
%configfwdfw);
141 # Load Location block rules.
144 # Load rules to block hostile networks.
145 &drop_hostile_networks
();
147 # Reload firewall policy.
148 run
("/usr/sbin/firewall-policy");
150 # Cleanup not longer needed ipset sets.
153 #Reload firewall.local if present
154 if ( -f
'/etc/sysconfig/firewall.local'){
155 run
("/etc/sysconfig/firewall.local reload");
160 # Executes or prints the given shell command.
169 print_error
("ERROR: $command");
177 print STDERR
"$message\n";
187 printf(" %2d: %s", $i++, $_);
195 return scalar @
$hash;
199 run
("$IPTABLES -F $CHAIN_INPUT");
200 run
("$IPTABLES -F $CHAIN_FORWARD");
201 run
("$IPTABLES -F $CHAIN_OUTPUT");
202 run
("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE");
203 run
("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION");
204 run
("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX");
210 # Search for targets that need to be specially handled when adding
211 # forwarding rules. Additional rules will automatically get inserted
212 # into the INPUT/OUTPUT chains for these targets.
213 my @special_input_targets = ();
214 if (!$POLICY_FORWARD_ALLOWED) {
215 push(@special_input_targets, "ACCEPT");
218 if ($POLICY_INPUT_ACTION eq "DROP") {
219 push(@special_input_targets, ("ACCEPT", "REJECT"));
220 } elsif ($POLICY_INPUT_ACTION eq "REJECT") {
221 push(@special_input_targets, ("ACCEPT", "DROP"));
224 my @special_output_targets = ();
225 if ($POLICY_OUTPUT_ALLOWED) {
226 push(@special_output_targets, ("DROP", "REJECT"));
228 push(@special_output_targets, "ACCEPT");
230 if ($POLICY_OUTPUT_ACTION eq "DROP") {
231 push(@special_output_targets, ("ACCEPT", "REJECT"));
232 } elsif ($POLICY_OUTPUT_ACTION eq "REJECT") {
233 push(@special_output_targets, ("ACCEPT", "DROP"));
237 foreach my $key (sort {$a <=> $b} keys %$hash) {
238 # Skip disabled rules.
239 next unless ($$hash{$key}[2] eq 'ON');
241 # Count number of elements in this line
242 my $elements = &count_elements
($$hash{$key});
245 print_rule
($$hash{$key});
248 # Check if the target is valid.
249 my $target = $$hash{$key}[0];
250 if (!$target ~~ @VALID_TARGETS) {
251 print_error
("Invalid target '$target' for rule $key");
255 # Check if the chain is valid.
256 my $chain = $$hash{$key}[1];
257 if (!$chain ~~ @VALID_CHAINS) {
258 print_error
("Invalid chain '$chain' in rule $key");
262 # Collect all sources.
263 my @sources = &fwlib
::get_addresses
($hash, $key, "src");
265 # Collect all destinations.
266 my @destinations = &fwlib
::get_addresses
($hash, $key, "tgt");
268 # True if the destination is the firewall itself.
269 my $destination_is_firewall = ($$hash{$key}[5] eq "ipfire");
271 # Check if logging should be enabled.
272 my $LOG = ($$hash{$key}[17] eq 'ON');
274 # Check if NAT is enabled and initialize variables, that we use for that.
275 my $NAT = ($$hash{$key}[28] eq 'ON');
278 $NAT_MODE = uc($$hash{$key}[31]);
281 # Set up time constraints.
282 my @time_options = ();
283 if ($$hash{$key}[18] eq 'ON') {
284 push(@time_options, ("-m", "time"));
286 # Select all days of the week this match is active.
288 if ($$hash{$key}[19] ne '') {
289 push (@weekdays, "Mon");
291 if ($$hash{$key}[20] ne '') {
292 push (@weekdays, "Tue");
294 if ($$hash{$key}[21] ne '') {
295 push (@weekdays, "Wed");
297 if ($$hash{$key}[22] ne '') {
298 push (@weekdays, "Thu");
300 if ($$hash{$key}[23] ne '') {
301 push (@weekdays, "Fri");
303 if ($$hash{$key}[24] ne '') {
304 push (@weekdays, "Sat");
306 if ($$hash{$key}[25] ne '') {
307 push (@weekdays, "Sun");
310 push(@time_options, ("--weekdays", join(",", @weekdays)));
313 # Convert start time.
314 my $time_start = &format_time
($$hash{$key}[26]);
316 push(@time_options, ("--timestart", $time_start));
320 my $time_stop = &format_time
($$hash{$key}[27]);
322 push(@time_options, ("--timestop", $time_stop));
326 # Concurrent connection limit
327 my @ratelimit_options = ();
329 if (($elements ge 34) && ($$hash{$key}[32] eq 'ON')) {
330 my $conn_limit = $$hash{$key}[33];
332 if ($conn_limit ge 1) {
333 push(@ratelimit_options, ("-m", "connlimit"));
335 # Use the the entire source IP address
336 push(@ratelimit_options, "--connlimit-saddr");
337 push(@ratelimit_options, ("--connlimit-mask", "32"));
340 push(@ratelimit_options, ("--connlimit-upto", $conn_limit));
345 if (($elements ge 37) && ($$hash{$key}[34] eq 'ON')) {
346 my $rate_limit = "$$hash{$key}[35]/$$hash{$key}[36]";
349 push(@ratelimit_options, ("-m", "limit"));
350 push(@ratelimit_options, ("--limit", $rate_limit));
354 # Check which protocols are used in this rule and so that we can
355 # later group rules by protocols.
356 my @protocols = &get_protocols
($hash, $key);
358 print_error
("Invalid protocol configuration for rule $key");
362 foreach my $protocol (@protocols) {
363 # Check if the given protocol is supported.
364 if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) {
365 print_error
("Protocol $protocol is not supported (rule $key)");
369 # Prepare protocol options (like ICMP types, ports, etc...).
370 my @protocol_options = &get_protocol_options
($hash, $key, $protocol, 0);
372 # Check if this protocol knows ports.
373 my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS);
375 foreach my $src (@sources) {
376 # Skip invalid source.
377 next unless (defined $src);
381 my $source = @
$src[0];
382 if ($source ~~ @ANY_ADDRESSES) {
386 my $source_intf = @
$src[1];
388 foreach my $dst (@destinations) {
389 # Skip invalid rules.
390 next unless (defined $dst);
391 next if (!$dst || ($dst eq "none"));
393 # Sanitize destination.
394 my $destination = @
$dst[0];
395 if ($destination ~~ @ANY_ADDRESSES) {
399 my $destination_intf = @
$dst[1];
401 # Array with iptables arguments.
405 if ($protocol ne "all") {
406 push(@options, @protocol_options);
409 # Prepare source options.
410 my @source_options = ();
411 if ($source =~ /mac/) {
412 push(@source_options, $source);
413 } elsif ($source =~ /-m set/) {
414 # Grab location code from hash.
415 my $loc_src = $$hash{$key}[4];
417 # Call function to load the networks list for this country.
418 &ipset_restore
($loc_src);
420 push(@source_options, $source);
422 push(@source_options, ("-s", $source));
425 # Prepare destination options.
426 my @destination_options = ();
427 if ($destination =~ /-m set/) {
428 # Grab location code from hash.
429 my $loc_dst = $$hash{$key}[6];
431 # Call function to load the networks list for this country.
432 &ipset_restore
($loc_dst);
434 push(@destination_options, $destination);
435 } elsif ($destination) {
436 push(@destination_options, ("-d", $destination));
439 # Add source and destination interface to the filter rules.
440 # These are supposed to help filtering forged packets that originate
441 # from BLUE with an IP address from GREEN for instance.
442 my @source_intf_options = ();
444 push(@source_intf_options, ("-i", $source_intf));
447 my @destination_intf_options = ();
448 if ($destination_intf) {
449 push(@destination_intf_options, ("-o", $destination_intf));
452 # Add time constraint options.
453 push(@options, @time_options);
455 # Add ratelimiting option
456 push(@options, @ratelimit_options);
458 my $firewall_is_in_source_subnet = 1;
460 $firewall_is_in_source_subnet = &firewall_is_in_subnet
($source);
463 my $firewall_is_in_destination_subnet = 1;
465 $firewall_is_in_destination_subnet = &firewall_is_in_subnet
($destination);
470 my $nat_address = &fwlib
::get_nat_address
($$hash{$key}[29], $source);
472 # Skip NAT rules if the NAT address is unknown
473 # (i.e. no internet connection has been established, yet).
474 next unless ($nat_address);
477 if ($NAT_MODE eq "DNAT") {
478 my @nat_options = ();
479 if ($protocol ne "all") {
480 my @nat_protocol_options = &get_protocol_options
($hash, $key, $protocol, 1);
481 push(@nat_options, @nat_protocol_options);
485 push(@nat_options, @time_options);
487 # Determine if a REDIRECT rule should be created.
488 my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports);
490 # Make port-forwardings useable from the internal networks.
491 if (!$use_redirect) {
492 my @internal_addresses = &fwlib
::get_internal_firewall_ip_addresses
(1);
493 unless ($nat_address ~~ @internal_addresses) {
494 &add_dnat_mangle_rules
($nat_address, $source_intf, @nat_options);
498 # Add source options.
499 push(@nat_options, @source_options);
502 if (!$use_redirect) {
503 push(@nat_options, ("-d", $nat_address));
507 if ($protocol_has_ports) {
508 $dnat_port = &get_dnat_target_port
($hash, $key);
511 my @nat_action_options = ();
513 # Use iptables REDIRECT
515 push(@nat_action_options, ("-j", "REDIRECT"));
517 # Redirect to specified port if one has given.
519 push(@nat_action_options, ("--to-ports", $dnat_port));
524 if ($destination_is_firewall && !$destination) {
525 $destination = &fwlib
::get_external_address
();
527 next unless ($destination);
529 my ($dnat_address, $dnat_mask) = split("/", $destination);
530 @destination_options = ("-d", $dnat_address);
532 if ($protocol_has_ports) {
533 my $dnat_port = &get_dnat_target_port
($hash, $key);
536 $dnat_address .= ":$dnat_port";
540 push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address));
544 run
("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '");
546 run
("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options");
549 } elsif ($NAT_MODE eq "SNAT") {
550 my @snat_options = ( "-m", "policy", "--dir", "out", "--pol", "none" );
551 my @nat_options = @options;
553 # Get addresses for the configured firewall interfaces.
554 my @local_addresses = &fwlib
::get_internal_firewall_ip_addresses
(1);
556 # Check if the nat_address is one of the local addresses.
557 foreach my $local_address (@local_addresses) {
558 if ($nat_address eq $local_address) {
559 # Clear SNAT options.
567 push(@nat_options, @destination_intf_options);
568 push(@nat_options, @source_options);
569 push(@nat_options, @destination_options);
572 run
("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options @log_limit_options -j LOG --log-prefix 'SNAT '");
574 run
("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options -j SNAT --to-source $nat_address");
578 push(@options, @source_options);
579 push(@options, @destination_options);
581 # Insert firewall rule.
583 run
("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options @log_limit_options -j LOG --log-prefix '$chain '");
585 run
("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options -j $target");
587 # Handle forwarding rules and add corresponding rules for firewall access.
588 if ($chain eq $CHAIN_FORWARD) {
589 # If the firewall is part of the destination subnet and access to the destination network
590 # is granted/forbidden for any network that the firewall itself is part of, we grant/forbid access
591 # for the firewall, too.
592 if ($firewall_is_in_destination_subnet && ($target ~~ @special_input_targets)) {
594 run
("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '");
596 run
("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options -j $target");
600 if ($firewall_is_in_source_subnet && ($target ~~ @special_output_targets)) {
602 run
("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_OUTPUT '");
604 run
("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options -j $target");
613 # Formats the given timestamp into the iptables format which is "hh:mm" UTC.
617 # Convert the given time into minutes.
618 my $minutes = &time_convert_to_minutes
($val);
620 # Move the timestamp into UTC.
621 $minutes += &time_utc_offset
();
623 # Make sure $minutes is between 00:00 and 23:59.
628 if ($minutes > 1440) {
633 return sprintf("%02d:%02d", $minutes / 60, $minutes % 60);
636 # Calculates the offsets in minutes from the local timezone to UTC.
637 sub time_utc_offset
{
638 my @localtime = localtime(time);
639 my @gmtime = gmtime(time);
641 return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60);
644 # Takes a timestamp like "14:00" and converts it into minutes since midnight.
645 sub time_convert_to_minutes
{
646 my ($hrs, $min) = split(":", shift);
648 return ($hrs * 60) + $min;
652 # Flush LOCATIONBLOCK chain.
653 run
("$IPTABLES -F LOCATIONBLOCK");
655 # If location blocking is not enabled, we are finished here.
656 if ($locationsettings{'LOCATIONBLOCK_ENABLED'} ne "on") {
657 # Exit submodule. Process remaining script.
661 # Only check the RED interface, which is ppp0 in case of RED_TYPE being
662 # set to "PPPOE", and red0 in case of RED_TYPE not being empty otherwise.
663 if ($defaultNetworks{'RED_TYPE'} eq "PPPOE") {
664 run
("$IPTABLES -A LOCATIONBLOCK ! -i ppp0 -j RETURN");
665 } elsif ($defaultNetworks{'RED_DEV'} ne "") {
666 run
("$IPTABLES -A LOCATIONBLOCK ! -i $defaultNetworks{'RED_DEV'} -j RETURN");
669 # Do not check any private address space
670 foreach my $network (@PRIVATE_NETWORKS) {
671 run
("$IPTABLES -A LOCATIONBLOCK -s $network -j RETURN");
674 # Loop through all supported locations and
675 # create iptables rules, if blocking for this country
677 foreach my $location (@locations) {
678 if(exists $locationsettings{$location} && $locationsettings{$location} eq "on") {
679 # Call function to load the networks list for this country.
680 &ipset_restore
($location);
682 # Call iptables and create rule to use the loaded ipset list.
683 run
("$IPTABLES -A LOCATIONBLOCK -m set --match-set $location src -j DROP");
688 sub drop_hostile_networks
() {
689 # Flush the HOSTILE firewall chain.
690 run
("$IPTABLES -F HOSTILE");
692 # If dropping hostile networks is not enabled, we are finished here.
693 if ($fwoptions{'DROPHOSTILE'} ne "on") {
698 # Exit if there is no red interface.
699 return unless($RED_DEV);
701 # Call function to load the network list of hostile networks.
702 &ipset_restore
($HOSTILE_CCODE);
704 # Check traffic in incoming/outgoing direction and drop if it matches
705 run
("$IPTABLES -A HOSTILE -i $RED_DEV -m set --match-set $HOSTILE_CCODE src -j HOSTILE_DROP");
706 run
("$IPTABLES -A HOSTILE -o $RED_DEV -m set --match-set $HOSTILE_CCODE dst -j HOSTILE_DROP");
713 my $uses_source_ports = ($$hash{$key}[7] eq "ON");
714 my $uses_services = ($$hash{$key}[11] eq "ON");
718 # Rules which don't have source ports or services (like ICMP, ESP, ...).
719 if (!$uses_source_ports && !$uses_services) {
720 push(@protocols, $$hash{$key}[8]);
722 # Rules which either use ports or services.
723 } elsif ($uses_source_ports || $uses_services) {
724 # Check if service group or service
725 if ($$hash{$key}[14] eq 'cust_srv') {
726 push(@protocols, &fwlib
::get_srv_prot
($$hash{$key}[15]));
728 } elsif($$hash{$key}[14] eq 'cust_srvgrp'){
729 my $protos = &fwlib
::get_srvgrp_prot
($$hash{$key}[15]);
730 push(@protocols, split(",", $protos));
733 # Fetch the protocol for this rule.
734 my $protocol = lc($$hash{$key}[8]);
736 # Fetch source and destination ports for this rule.
737 my $source_ports = $$hash{$key}[10];
738 my $destination_ports = $$hash{$key}[15];
740 # Check if ports are set for protocols which do not support ports.
741 if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) {
742 print_error
("$protocol does not support ports");
746 push(@protocols, $protocol);
750 # Remove all empty elements
751 @protocols = map { $_ ?
$_ : () } @protocols;
753 # If no protocol has been defined, we assume "all".
755 push(@protocols, "all");
758 # Make all protocol names lowercase.
759 @protocols = map { lc } @protocols;
764 sub get_protocol_options
{
767 my $protocol = shift;
768 my $nat_options_wanted = shift;
771 # Nothing to do if no protocol is specified.
772 if ($protocol eq "all") {
775 push(@options, ("-p", $protocol));
778 if ($protocol ~~ @PROTOCOLS_WITH_PORTS) {
779 # Process source ports.
780 my $use_src_ports = ($$hash{$key}[7] eq "ON");
781 my $src_ports = $$hash{$key}[10];
783 if ($use_src_ports && $src_ports) {
784 push(@options, &format_ports
($src_ports, "src"));
787 # Process destination ports.
788 my $use_dst_ports = ($$hash{$key}[11] eq "ON");
789 my $use_dnat = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat"));
791 if ($use_dst_ports) {
792 my $dst_ports_mode = $$hash{$key}[14];
793 my $dst_ports = $$hash{$key}[15];
795 if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) {
796 if ($nat_options_wanted && $use_dnat && $$hash{$key}[30]) {
797 $dst_ports = $$hash{$key}[30];
799 push(@options, &format_ports
($dst_ports, "dst"));
801 } elsif ($dst_ports_mode eq "cust_srv") {
802 if ($protocol eq "ICMP") {
803 push(@options, ("--icmp-type", &fwlib
::get_srv_port
($dst_ports, 3, "ICMP")));
805 $dst_ports = &fwlib
::get_srv_port
($dst_ports, 1, uc($protocol));
806 push(@options, &format_ports
($dst_ports, "dst"));
809 } elsif ($dst_ports_mode eq "cust_srvgrp") {
810 push(@options, &fwlib
::get_srvgrp_port
($dst_ports, uc($protocol)));
815 # Check if a single ICMP type is selected.
816 if ($protocol eq "icmp") {
817 my $icmp_type = $$hash{$key}[9];
819 if (($icmp_type ne "All ICMP-Types") && $icmp_type) {
820 push(@options, ("--icmp-type", $icmp_type));
832 if ($type eq "src") {
834 } elsif ($type eq "dst") {
840 if ($ports =~ /\|/) {
842 push(@options, ("-m", "multiport"));
846 push(@options, ($arg, $ports));
852 sub get_dnat_target_port
{
856 if ($$hash{$key}[14] eq "TGT_PORT") {
857 my $port = $$hash{$key}[15];
858 my $external_port = $$hash{$key}[30];
860 if ($external_port && ($port ne $external_port)) {
861 return $$hash{$key}[15];
866 sub add_dnat_mangle_rules
{
867 my $nat_address = shift;
868 my $interface = shift;
871 my $mark = 0x01000000;
872 foreach my $zone ("GREEN", "BLUE", "ORANGE") {
873 # Skip rule if not all required information exists.
874 next unless (exists $defaultNetworks{$zone . "_NETADDRESS"});
875 next unless (exists $defaultNetworks{$zone . "_NETMASK"});
877 next if ($interface && $interface ne $defaultNetworks{$zone . "_DEV"});
879 my @mangle_options = @options;
881 my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"};
882 $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"};
884 push(@mangle_options, ("-s", $netaddress, "-d", $nat_address));
885 push(@mangle_options, ("-j", "MARK", "--set-xmark", "$mark/$NAT_MASK"));
887 run
("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options");
893 sub make_log_limit_options
{
894 my @options = ("-m", "limit");
896 # Maybe we should get this from the configuration.
899 # We limit log messages to $limit messages per second.
900 push(@options, ("--limit", "$limit/second"));
902 # And we allow bursts of 2x $limit.
903 push(@options, ("--limit-burst", $limit * 2));
908 sub firewall_is_in_subnet
{
911 # ORANGE is missing here, because nothing may ever access
912 # the firewall from this network.
913 my $address = &fwlib
::get_internal_firewall_ip_address
($subnet, 0);
922 sub ipset_get_sets
() {
923 # Get all currently used ipset lists and store them in an array.
924 my @output = `$IPSET -n list`;
926 # Loop through the temporary array.
927 foreach my $set (@output) {
928 # Remove any newlines.
931 # Add the set the array of used sets.
932 push(@ipset_used_sets, $set);
935 # Display used sets in debug mode.
937 print "Used ipset sets:\n";
938 print "@ipset_used_sets\n\n";
942 sub ipset_restore
($) {
945 # Empty variable to store the db file, which should be
949 # Check if the set already has been loaded.
950 if($ipset_loaded_sets{$set}) {
951 # It already has been loaded - so there is nothing to do.
955 # Check if the given set name is a country code.
956 if($set ~~ @locations) {
957 # Libloc adds the IP type (v4 or v6) as part of the set and file name.
958 my $loc_set = "$set" . "v4";
960 # The bare filename equals the set name.
961 my $filename = $loc_set;
963 # Libloc uses "ipset" as file extension.
964 my $file_extension = "ipset";
966 # Generate full path and filename for the ipset db file.
967 my $db_file = "$Location::Functions::ipset_db_directory/$filename.$file_extension";
969 # Call function to restore/load the set.
970 &ipset_call_restore
($db_file);
972 # Check if the set is already loaded (has been used before).
973 if ($set ~~ @ipset_used_sets) {
974 # The sets contains the IP type (v4 or v6) as part of the name.
975 # The firewall rules matches against sets without that extension. So we safely
976 # can swap or rename the sets to use the new ones.
977 run
("$IPSET swap $loc_set $set");
979 # If the set is not loaded, we have to rename it to proper use it.
980 run
("$IPSET rename $loc_set $set");
984 # Store the restored set to the hash to prevent from loading it again.
985 $ipset_loaded_sets{$set} = "1";
988 sub ipset_call_restore
($) {
991 # Check if the requested file exists.
993 # Run ipset and restore the given set.
994 run
("$IPSET restore -f $file");
998 sub ipset_cleanup
() {
999 # Loop through the array of used sets.
1000 foreach my $set (@ipset_used_sets) {
1001 # Check if this set is still in use.
1003 # In this case an entry in the loaded sets hash exists.
1004 unless($ipset_loaded_sets{$set}) {
1005 # Entry does not exist, so this set is not longer
1006 # used and can be destroyed.
1007 run
("$IPSET destroy $set");