config/firewall/rules.pl

   1 #!/usr/bin/perl -w
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2013 Alexander Marx <amarx@ipfire.org>                        #
   6 #                                                                             #
   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.                                         #
  11 #                                                                             #
  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.                                #
  16 #                                                                             #
  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/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 use strict;
  23
  24 require '/var/ipfire/general-functions.pl';
  25 require "${General::swroot}/lang.pl";
  26 require "/usr/lib/firewall/firewall-lib.pl";
  27
  28 # Set to one to enable debugging mode.
  29 my $DEBUG = 0;
  30
  31 my $IPTABLES = "iptables --wait";
  32
  33 # iptables chains
  34 my $CHAIN_INPUT           = "INPUTFW";
  35 my $CHAIN_FORWARD         = "FORWARDFW";
  36 my $CHAIN_OUTPUT          = "OUTPUTFW";
  37 my $CHAIN                 = $CHAIN_FORWARD;
  38 my $CHAIN_NAT_SOURCE      = "NAT_SOURCE";
  39 my $CHAIN_NAT_DESTINATION = "NAT_DESTINATION";
  40 my $CHAIN_MANGLE_NAT_DESTINATION_FIX = "NAT_DESTINATION";
  41 my @VALID_CHAINS          = ($CHAIN_INPUT, $CHAIN_FORWARD, $CHAIN_OUTPUT);
  42
  43 my @PROTOCOLS = ("tcp", "udp", "icmp", "igmp", "ah", "esp", "gre", "ipv6", "ipip");
  44 my @PROTOCOLS_WITH_PORTS = ("tcp", "udp");
  45
  46 my @VALID_TARGETS = ("ACCEPT", "DROP", "REJECT");
  47
  48 my %fwdfwsettings=();
  49 my %defaultNetworks=();
  50 my %configfwdfw=();;
  51 my %customgrp=();
  52 my %configinputfw=();
  53 my %configoutgoingfw=();
  54 my %confignatfw=();
  55 my %aliases=();
  56 my @p2ps=();
  57
  58 my $configfwdfw         = "${General::swroot}/firewall/config";
  59 my $configinput     = "${General::swroot}/firewall/input";
  60 my $configoutgoing  = "${General::swroot}/firewall/outgoing";
  61 my $p2pfile                     = "${General::swroot}/firewall/p2protocols";
  62 my $configgrp           = "${General::swroot}/fwhosts/customgroups";
  63 my $netsettings         = "${General::swroot}/ethernet/settings";
  64
  65 &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings);
  66 &General::readhash("$netsettings", \%defaultNetworks);
  67 &General::readhasharray($configfwdfw, \%configfwdfw);
  68 &General::readhasharray($configinput, \%configinputfw);
  69 &General::readhasharray($configoutgoing, \%configoutgoingfw);
  70 &General::readhasharray($configgrp, \%customgrp);
  71 &General::get_aliases(\%aliases);
  72
  73 # MAIN
  74 &main();
  75
  76 sub main {
  77         # Flush all chains.
  78         &flush();
  79
  80         # Reload firewall rules.
  81         &preparerules();
  82
  83         # Load P2P block rules.
  84         &p2pblock();
  85
  86         # Reload firewall policy.
  87         run("/usr/sbin/firewall-policy");
  88 }
  89
  90 sub run {
  91         # Executes or prints the given shell command.
  92         my $command = shift;
  93
  94         if ($DEBUG) {
  95                 print "$command\n";
  96         } else {
  97                 system "$command";
  98
  99                 if ($?) {
 100                         print_error("ERROR: $command");
 101                 }
 102         }
 103 }
 104
 105 sub print_error {
 106         my $message = shift;
 107
 108         print STDERR "$message\n";
 109 }
 110
 111 sub print_rule {
 112         my $hash = shift;
 113
 114         print "\nRULE:";
 115
 116         my $i = 0;
 117         foreach (@$hash) {
 118                 printf("  %2d: %s", $i++, $_);
 119         }
 120         print "\n";
 121 }
 122
 123 sub flush {
 124         run("$IPTABLES -F FORWARDFW");
 125         run("$IPTABLES -F INPUTFW");
 126         run("$IPTABLES -F OUTGOINGFW");
 127         run("$IPTABLES -t nat -F NAT_DESTINATION");
 128         run("$IPTABLES -t nat -F NAT_SOURCE");
 129         run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX");
 130 }
 131
 132 sub preparerules {
 133         if (! -z  "${General::swroot}/firewall/config"){
 134                 &buildrules(\%configfwdfw);
 135         }
 136         if (! -z  "${General::swroot}/firewall/input"){
 137                 &buildrules(\%configinputfw);
 138         }
 139         if (! -z  "${General::swroot}/firewall/outgoing"){
 140                 &buildrules(\%configoutgoingfw);
 141         }
 142 }
 143
 144 sub buildrules {
 145         my $hash = shift;
 146
 147         foreach my $key (sort {$a <=> $b} keys %$hash) {
 148                 # Skip disabled rules.
 149                 next unless ($$hash{$key}[2] eq 'ON');
 150
 151                 if ($DEBUG) {
 152                         print_rule($$hash{$key});
 153                 }
 154
 155                 # Check if the target is valid.
 156                 my $target = $$hash{$key}[0];
 157                 if (!$target ~~ @VALID_TARGETS) {
 158                         print_error("Invalid target '$target' for rule $key");
 159                         next;
 160                 }
 161
 162                 # Check if the chain is valid.
 163                 my $chain = $$hash{$key}[1];
 164                 if (!$chain ~~ @VALID_CHAINS) {
 165                         print_error("Invalid chain '$chain' in rule $key");
 166                         next;
 167                 }
 168
 169                 # Collect all sources.
 170                 my @sources = &get_addresses($hash, $key, "src");
 171
 172                 # Collect all destinations.
 173                 my @destinations = &get_addresses($hash, $key, "tgt");
 174
 175                 my $time_constraints = "";
 176
 177                 # Check if logging should be enabled.
 178                 my $LOG = ($$hash{$key}[17] eq 'ON');
 179
 180                 # Check if NAT is enabled and initialize variables, that we use for that.
 181                 my $NAT = ($$hash{$key}[28] eq 'ON');
 182                 my $NAT_MODE;
 183                 if ($NAT) {
 184                         $NAT_MODE = uc($$hash{$key}[31]);
 185                 }
 186
 187                 # Set up time constraints.
 188                 my @time_options = ();
 189                 if ($$hash{$key}[18] eq 'ON') {
 190                         push(@time_options, ("-m", "time"));
 191
 192                         # Select all days of the week this match is active.
 193                         my @weekdays = ();
 194                         if ($$hash{$key}[19] ne '') {
 195                                 push (@weekdays, "Mon");
 196                         }
 197                         if ($$hash{$key}[20] ne '') {
 198                                 push (@weekdays, "Tue");
 199                         }
 200                         if ($$hash{$key}[21] ne '') {
 201                                 push (@weekdays, "Wed");
 202                         }
 203                         if ($$hash{$key}[22] ne '') {
 204                                 push (@weekdays, "Thu");
 205                         }
 206                         if ($$hash{$key}[23] ne '') {
 207                                 push (@weekdays, "Fri");
 208                         }
 209                         if ($$hash{$key}[24] ne '') {
 210                                 push (@weekdays, "Sat");
 211                         }
 212                         if ($$hash{$key}[25] ne '') {
 213                                 push (@weekdays, "Sun");
 214                         }
 215                         if (@weekdays) {
 216                                 push(@time_options, ("--weekdays", join(",", @weekdays)));
 217                         }
 218
 219                         # Convert start time.
 220                         my $time_start = &format_time($$hash{$key}[26]);
 221                         if ($time_start) {
 222                                 push(@time_options, ("--timestart", $time_start));
 223                         }
 224
 225                         # Convert end time.
 226                         my $time_stop = &format_time($$hash{$key}[27]);
 227                         if ($time_stop) {
 228                                 push(@time_options, ("--timestop", $time_stop));
 229                         }
 230                 }
 231
 232                 # Check which protocols are used in this rule and so that we can
 233                 # later group rules by protocols.
 234                 my @protocols = &get_protocols($hash, $key);
 235                 if (!@protocols) {
 236                         print_error("Invalid protocol configuration for rule $key");
 237                         next;
 238                 }
 239
 240                 foreach my $protocol (@protocols) {
 241                         # Check if the given protocol is supported.
 242                         if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) {
 243                                 print_error("Protocol $protocol is not supported (rule $key)");
 244                                 next;
 245                         }
 246
 247                         # Prepare protocol options (like ICMP types, ports, etc...).
 248                         my @protocol_options = &get_protocol_options($hash, $key, $protocol);
 249
 250                         # Check if this protocol knows ports.
 251                         my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS);
 252
 253                         foreach my $source (@sources) {
 254                                 foreach my $destination (@destinations) {
 255                                         # Skip invalid rules.
 256                                         next if (!$source || !$destination || ($destination eq "none"));
 257
 258                                         # Array with iptables arguments.
 259                                         my @options = ();
 260
 261                                         # Append protocol.
 262                                         if ($protocol ne "all") {
 263                                                 push(@options, ("-p", $protocol));
 264                                                 push(@options, @protocol_options);
 265                                         }
 266
 267                                         # Prepare source options.
 268                                         my @source_options = ();
 269                                         if ($source =~ /mac/) {
 270                                                 push(@source_options, $source);
 271                                         } else {
 272                                                 push(@source_options, ("-s", $source));
 273                                         }
 274
 275                                         # Prepare destination options.
 276                                         my @destination_options = ("-d", $destination);
 277
 278                                         # Add time constraint options.
 279                                         push(@options, @time_options);
 280
 281                                         # Process NAT rules.
 282                                         if ($NAT) {
 283                                                 my $nat_address = &get_nat_address($$hash{$key}[29]);
 284
 285                                                 # Skip NAT rules if the NAT address is unknown
 286                                                 # (i.e. no internet connection has been established, yet).
 287                                                 next unless ($nat_address);
 288
 289                                                 # Destination NAT
 290                                                 if ($NAT_MODE eq "DNAT") {
 291                                                         # Make port-forwardings useable from the internal networks.
 292                                                         &add_dnat_mangle_rules($nat_address, @options);
 293
 294                                                         my @nat_options = @options;
 295                                                         push(@nat_options, @source_options);
 296                                                         push(@nat_options, ("-d", $nat_address));
 297
 298                                                         my ($dnat_address, $dnat_mask) = split("/", $destination);
 299                                                         @destination_options = ("-d", $dnat_address);
 300
 301                                                         if ($protocol_has_ports) {
 302                                                                 my $dnat_port = &get_dnat_target_port($hash, $key);
 303
 304                                                                 if ($dnat_port) {
 305                                                                         $dnat_address .= ":$dnat_port";
 306                                                                 }
 307                                                         }
 308
 309                                                         if ($LOG) {
 310                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options -j LOG --log-prefix 'DNAT'");
 311                                                         }
 312                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options -j DNAT --to-destination $dnat_address");
 313
 314                                                 # Source NAT
 315                                                 } elsif ($NAT_MODE eq "SNAT") {
 316                                                         my @nat_options = @options;
 317
 318                                                         push(@nat_options, @source_options);
 319                                                         push(@nat_options, @destination_options);
 320
 321                                                         if ($LOG) {
 322                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options -j LOG --log-prefix 'SNAT'");
 323                                                         }
 324                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options -j SNAT --to-source $nat_address");
 325                                                 }
 326                                         }
 327
 328                                         push(@options, @source_options);
 329                                         push(@options, @destination_options);
 330
 331                                         # Insert firewall rule.
 332                                         if ($LOG && !$NAT) {
 333                                                 run("$IPTABLES -A $chain @options -j LOG");
 334                                         }
 335                                         run("$IPTABLES -A $chain @options -j $target");
 336                                 }
 337                         }
 338                 }
 339         }
 340 }
 341
 342 sub get_external_interface() {
 343         open(IFACE, "/var/ipfire/red/iface") or return "";
 344         my $iface = <IFACE>;
 345         close(IFACE);
 346
 347         return $iface;
 348 }
 349
 350 sub get_external_address() {
 351         open(ADDR, "/var/ipfire/red/local-ipaddress") or return "";
 352         my $address = <ADDR>;
 353         close(ADDR);
 354
 355         return $address;
 356 }
 357
 358 sub get_alias {
 359         my $id = shift;
 360
 361         foreach my $alias (sort keys %aliases) {
 362                 if ($id eq $alias) {
 363                         return $aliases{$alias};
 364                 }
 365         }
 366 }
 367
 368 sub get_nat_address {
 369         my $zone = shift;
 370
 371         # Any static address of any zone.
 372         if ($zone eq "RED" || $zone eq "GREEN" || $zone eq "ORANGE" || $zone eq "BLUE") {
 373                 return $defaultNetworks{$zone . "_ADDRESS"};
 374
 375         } elsif ($zone eq "Default IP") {
 376                 return &get_external_address();
 377
 378         } else {
 379                 return &get_alias($zone);
 380         }
 381
 382         print_error("Could not find NAT address");
 383 }
 384
 385 # Formats the given timestamp into the iptables format which is "hh:mm" UTC.
 386 sub format_time {
 387         my $val = shift;
 388
 389         # Convert the given time into minutes.
 390         my $minutes = &time_convert_to_minutes($val);
 391
 392         # Move the timestamp into UTC.
 393         $minutes += &time_utc_offset();
 394
 395         # Make sure $minutes is between 00:00 and 23:59.
 396         if ($minutes < 0) {
 397                 $minutes += 1440;
 398         }
 399
 400         if ($minutes > 1440) {
 401                 $minutes -= 1440;
 402         }
 403
 404         # Format as hh:mm.
 405         return sprintf("%02d:%02d", $minutes / 60, $minutes % 60);
 406 }
 407
 408 # Calculates the offsets in minutes from the local timezone to UTC.
 409 sub time_utc_offset {
 410         my @localtime = localtime(time);
 411         my @gmtime = gmtime(time);
 412
 413         return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60);
 414 }
 415
 416 # Takes a timestamp like "14:00" and converts it into minutes since midnight.
 417 sub time_convert_to_minutes {
 418         my ($hrs, $min) = split(":", shift);
 419
 420         return ($hrs * 60) + $min;
 421 }
 422
 423 sub p2pblock {
 424         my $P2PSTRING = "";
 425         my $DO;
 426         open( FILE, "< $p2pfile" ) or die "Unable to read $p2pfile";
 427         @p2ps = <FILE>;
 428         close FILE;
 429         my $CMD = "-m ipp2p";
 430         foreach my $p2pentry (sort @p2ps) {
 431                 my @p2pline = split( /\;/, $p2pentry );
 432                 if ( $fwdfwsettings{'POLICY'} eq 'MODE1' ) {
 433                         $DO = "ACCEPT";
 434                         if ("$p2pline[2]" eq "on") {
 435                                 $P2PSTRING = "$P2PSTRING --$p2pline[1]";
 436                         }
 437                 }else {
 438                         $DO = "RETURN";
 439                         if ("$p2pline[2]" eq "off") {
 440                                 $P2PSTRING = "$P2PSTRING --$p2pline[1]";
 441                         }
 442                 }
 443         }
 444
 445         if($P2PSTRING) {
 446                 run("$IPTABLES -A FORWARDFW $CMD $P2PSTRING -j $DO");
 447         }
 448 }
 449
 450 sub get_addresses {
 451         my $hash = shift;
 452         my $key  = shift;
 453         my $type = shift;
 454
 455         my @addresses = ();
 456         my $addr_type;
 457         my $value;
 458         my $group_name;
 459
 460         if ($type eq "src") {
 461                 $addr_type = $$hash{$key}[3];
 462                 $value = $$hash{$key}[4];
 463
 464         } elsif ($type eq "tgt") {
 465                 $addr_type = $$hash{$key}[5];
 466                 $value = $$hash{$key}[6];
 467         }
 468
 469         if ($addr_type ~~ ["cust_grp_src", "cust_grp_tgt"]) {
 470                 foreach my $grp (sort {$a <=> $b} keys %customgrp) {
 471                         if ($customgrp{$grp}[0] eq $value) {
 472                                 my @address = &get_address($customgrp{$grp}[3], $customgrp{$grp}[2], $type);
 473
 474                                 if (@address) {
 475                                         push(@addresses, @address);
 476                                 }
 477                         }
 478                 }
 479         } else {
 480                 my @address = &get_address($addr_type, $value, $type);
 481
 482                 if (@address) {
 483                         push(@addresses, @address);
 484                 }
 485         }
 486
 487         return @addresses;
 488 }
 489
 490 sub get_address {
 491         my $key   = shift;
 492         my $value = shift;
 493         my $type  = shift;
 494
 495         my @ret = ();
 496
 497         # If the user manually typed an address, we just check if it is a MAC
 498         # address. Otherwise, we assume that it is an IP address.
 499         if ($key ~~ ["src_addr", "tgt_addr"]) {
 500                 if (&General::validmac($value)) {
 501                         push(@ret, "-m mac --mac-source $value");
 502                 } else {
 503                         push(@ret, $value);
 504                 }
 505
 506         # If a default network interface (GREEN, BLUE, etc.) is selected, we
 507         # try to get the corresponding address of the network.
 508         } elsif ($key ~~ ["std_net_src", "std_net_tgt", "Standard Network"]) {
 509                 my $external_interface = &get_external_interface();
 510
 511                 my $network_address = &fwlib::get_std_net_ip($value, $external_interface);
 512                 if ($network_address) {
 513                         push(@ret, $network_address);
 514                 }
 515
 516         # Custom networks.
 517         } elsif ($key ~~ ["cust_net_src", "cust_net_tgt", "Custom Network"]) {
 518                 my $network_address = &fwlib::get_net_ip($value);
 519                 if ($network_address) {
 520                         push(@ret, $network_address);
 521                 }
 522
 523         # Custom hosts.
 524         } elsif ($key ~~ ["cust_host_src", "cust_host_tgt", "Custom Host"]) {
 525                 my $host_address = &fwlib::get_host_ip($value, $type);
 526                 if ($host_address) {
 527                         push(@ret, $host_address);
 528                 }
 529
 530         # OpenVPN networks.
 531         } elsif ($key ~~ ["ovpn_net_src", "ovpn_net_tgt", "OpenVPN static network"]) {
 532                 my $network_address = &fwlib::get_ovpn_net_ip($value, 1);
 533                 if ($network_address) {
 534                         push(@ret, $network_address);
 535                 }
 536
 537         # OpenVPN hosts.
 538         } elsif ($key ~~ ["ovpn_host_src", "ovpn_host_tgt", "OpenVPN static host"]) {
 539                 my $host_address = &fwlib::get_ovpn_host_ip($value, 33);
 540                 if ($host_address) {
 541                         push(@ret, $host_address);
 542                 }
 543
 544         # OpenVPN N2N.
 545         } elsif ($key ~~ ["ovpn_n2n_src", "ovpn_n2n_tgt", "OpenVPN N-2-N"]) {
 546                 my $network_address = &fwlib::get_ovpn_n2n_ip($value, 11);
 547                 if ($network_address) {
 548                         push(@ret, $network_address);
 549                 }
 550
 551         # IPsec networks.
 552         } elsif ($key ~~ ["ipsec_net_src", "ipsec_net_tgt", "IpSec Network"]) {
 553                 my $network_address = &fwlib::get_ipsec_net_ip($value, 11);
 554                 if ($network_address) {
 555                         push(@ret, $network_address);
 556                 }
 557
 558         # The firewall's own IP addresses.
 559         } elsif ($key ~~ ["ipfire", "ipfire_src"]) {
 560                 # ALL
 561                 if ($value eq "ALL") {
 562                         push(@ret, "0/0");
 563
 564                 # GREEN
 565                 } elsif ($value eq "GREEN") {
 566                         push(@ret, $defaultNetworks{"GREEN_ADDRESS"});
 567
 568                 # BLUE
 569                 } elsif ($value eq "BLUE") {
 570                         push(@ret, $defaultNetworks{"BLUE_ADDRESS"});
 571
 572                 # ORANGE
 573                 } elsif ($value eq "ORANGE") {
 574                         push(@ret, $defaultNetworks{"ORANGE_ADDRESS"});
 575
 576                 # RED
 577                 } elsif ($value ~~ ["RED", "RED1"]) {
 578                         my $address = &get_external_address();
 579                         if ($address) {
 580                                 push(@ret, $address);
 581                         }
 582
 583                 # Aliases
 584                 } else {
 585                         my %alias = &get_alias($value);
 586                         if (%alias) {
 587                                 push(@ret, $alias{"IPT"});
 588                         }
 589                 }
 590
 591         # If nothing was selected, we assume "any".
 592         } else {
 593                 push(@ret, "0/0");
 594         }
 595
 596         return @ret;
 597 }
 598
 599 sub get_protocols {
 600         my $hash = shift;
 601         my $key = shift;
 602
 603         my $uses_source_ports = ($$hash{$key}[7] eq "ON");
 604         my $uses_services = ($$hash{$key}[11] eq "ON");
 605
 606         my @protocols = ();
 607
 608         # Rules which don't have source ports or services (like ICMP, ESP, ...).
 609         if (!$uses_source_ports && !$uses_services) {
 610                 push(@protocols, $$hash{$key}[8]);
 611
 612         # Rules which either use ports or services.
 613         } elsif ($uses_source_ports || $uses_services) {
 614                 # Check if service group or service
 615                 if ($$hash{$key}[14] eq 'cust_srv') {
 616                         push(@protocols, &fwlib::get_srv_prot($$hash{$key}[15]));
 617
 618                 } elsif($$hash{$key}[14] eq 'cust_srvgrp'){
 619                         my $protos = &fwlib::get_srvgrp_prot($$hash{$key}[15]);
 620                         push(@protocols, split(",", $protos));
 621
 622                 } else {
 623                         # Fetch the protocol for this rule.
 624                         my $protocol = lc($$hash{$key}[8]);
 625
 626                         # Fetch source and destination ports for this rule.
 627                         my $source_ports = $$hash{$key}[10];
 628                         my $destination_ports = $$hash{$key}[15];
 629
 630                         # Check if ports are set for protocols which do not support ports.
 631                         if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) {
 632                                 print_error("$protocol does not support ports");
 633                                 return ();
 634                         }
 635
 636                         push(@protocols, $protocol);
 637                 }
 638         }
 639
 640         # Remove all empty elements
 641         @protocols = map { $_ ? $_ : () } @protocols;
 642
 643         # If no protocol has been defined, we assume "all".
 644         if (!@protocols) {
 645                 push(@protocols, "all");
 646         }
 647
 648         # Make all protocol names lowercase.
 649         @protocols = map { lc } @protocols;
 650
 651         return @protocols;
 652 }
 653
 654 sub get_protocol_options {
 655         my $hash = shift;
 656         my $key  = shift;
 657         my $protocol = shift;
 658         my @options = ();
 659
 660         # Process source ports.
 661         my $use_src_ports = ($$hash{$key}[7] eq "ON");
 662         my $src_ports     = $$hash{$key}[10];
 663
 664         if ($use_src_ports && $src_ports) {
 665                 push(@options, &format_ports($src_ports, "src"));
 666         }
 667
 668         # Process destination ports.
 669         my $use_dst_ports  = ($$hash{$key}[11] eq "ON");
 670         my $use_dnat       = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat"));
 671
 672         if ($use_dst_ports) {
 673                 my $dst_ports_mode = $$hash{$key}[14];
 674                 my $dst_ports      = $$hash{$key}[15];
 675
 676                 if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) {
 677                         if ($use_dnat && $$hash{$key}[30]) {
 678                                 $dst_ports = $$hash{$key}[30];
 679                         }
 680                         push(@options, &format_ports($dst_ports, "dst"));
 681
 682                 } elsif ($dst_ports_mode eq "cust_srv") {
 683                         if ($protocol eq "ICMP") {
 684                                 push(@options, ("--icmp-type", &fwlib::get_srv_port($dst_ports, 3, "ICMP")));
 685                         } else {
 686                                 $dst_ports = &fwlib::get_srv_port($dst_ports, 1, uc($protocol));
 687                                 push(@options, &format_ports($dst_ports, "dst"));
 688                         }
 689
 690                 } elsif ($dst_ports_mode eq "cust_srvgrp") {
 691                         push(@options, &fwlib::get_srvgrp_port($dst_ports, uc($protocol)));
 692                 }
 693         }
 694
 695         # Check if a single ICMP type is selected.
 696         if (!$use_src_ports && !$use_dst_ports && $protocol eq "icmp") {
 697                 my $icmp_type = $$hash{$key}[9];
 698
 699                 if (($icmp_type ne "All ICMP-Types") && $icmp_type) {
 700                         push(@options, ("--icmp-type", $icmp_type));
 701                 }
 702         }
 703
 704         return @options;
 705 }
 706
 707 sub format_ports {
 708         my $ports = shift;
 709         my $type = shift;
 710
 711         my $arg;
 712         if ($type eq "src") {
 713                 $arg = "--sport";
 714         } elsif ($type eq "dst") {
 715                 $arg = "--dport";
 716         }
 717
 718         my @options = ();
 719
 720         if ($ports =~ /\|/) {
 721                 $ports =~ s/\|/,/g;
 722                 push(@options, ("-m", "multiport"));
 723         }
 724
 725         if ($ports) {
 726                 push(@options, ($arg, $ports));
 727         }
 728
 729         return @options;
 730 }
 731
 732 sub get_dnat_target_port {
 733         my $hash = shift;
 734         my $key  = shift;
 735
 736         if ($$hash{$key}[14] eq "TGT_PORT") {
 737                 my $port = $$hash{$key}[15];
 738                 my $external_port = $$hash{$key}[30];
 739
 740                 if ($external_port && ($port ne $external_port)) {
 741                         return $$hash{$key}[15];
 742                 }
 743         }
 744 }
 745
 746 sub add_dnat_mangle_rules {
 747         my $nat_address = shift;
 748         my @options = @_;
 749
 750         my $mark = 0;
 751         foreach my $zone ("GREEN", "BLUE", "ORANGE") {
 752                 $mark++;
 753
 754                 # Skip rule if not all required information exists.
 755                 next unless (exists $defaultNetworks{$zone . "_NETADDRESS"});
 756                 next unless (exists $defaultNetworks{$zone . "_NETMASK"});
 757
 758                 my @mangle_options = @options;
 759
 760                 my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"};
 761                 $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"};
 762
 763                 push(@mangle_options, ("-s", $netaddress, "-d", $nat_address));
 764                 push(@mangle_options, ("-j", "MARK", "--set-mark", $mark));
 765
 766                 run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options");
 767         }
 768 }