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          = "OUTGOINGFW";
  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 my @ANY_ADDRESSES         = ("0.0.0.0/0.0.0.0", "0.0.0.0/0", "0/0");
  43
  44 my @PROTOCOLS = ("tcp", "udp", "icmp", "igmp", "ah", "esp", "gre", "ipv6", "ipip");
  45 my @PROTOCOLS_WITH_PORTS = ("tcp", "udp");
  46
  47 my @VALID_TARGETS = ("ACCEPT", "DROP", "REJECT");
  48
  49 my %fwdfwsettings=();
  50 my %defaultNetworks=();
  51 my %configfwdfw=();;
  52 my %customgrp=();
  53 my %configinputfw=();
  54 my %configoutgoingfw=();
  55 my %confignatfw=();
  56 my %aliases=();
  57 my @p2ps=();
  58
  59 my $configfwdfw         = "${General::swroot}/firewall/config";
  60 my $configinput     = "${General::swroot}/firewall/input";
  61 my $configoutgoing  = "${General::swroot}/firewall/outgoing";
  62 my $p2pfile                     = "${General::swroot}/firewall/p2protocols";
  63 my $configgrp           = "${General::swroot}/fwhosts/customgroups";
  64 my $netsettings         = "${General::swroot}/ethernet/settings";
  65
  66 &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings);
  67 &General::readhash("$netsettings", \%defaultNetworks);
  68 &General::readhasharray($configfwdfw, \%configfwdfw);
  69 &General::readhasharray($configinput, \%configinputfw);
  70 &General::readhasharray($configoutgoing, \%configoutgoingfw);
  71 &General::readhasharray($configgrp, \%customgrp);
  72 &General::get_aliases(\%aliases);
  73
  74 my @log_limit_options = &make_log_limit_options();
  75
  76 # MAIN
  77 &main();
  78
  79 sub main {
  80         # Flush all chains.
  81         &flush();
  82
  83         # Reload firewall rules.
  84         &preparerules();
  85
  86         # Load P2P block rules.
  87         &p2pblock();
  88
  89         # Reload firewall policy.
  90         run("/usr/sbin/firewall-policy");
  91 }
  92
  93 sub run {
  94         # Executes or prints the given shell command.
  95         my $command = shift;
  96
  97         if ($DEBUG) {
  98                 print "$command\n";
  99         } else {
 100                 system "$command";
 101
 102                 if ($?) {
 103                         print_error("ERROR: $command");
 104                 }
 105         }
 106 }
 107
 108 sub print_error {
 109         my $message = shift;
 110
 111         print STDERR "$message\n";
 112 }
 113
 114 sub print_rule {
 115         my $hash = shift;
 116
 117         print "\nRULE:";
 118
 119         my $i = 0;
 120         foreach (@$hash) {
 121                 printf("  %2d: %s", $i++, $_);
 122         }
 123         print "\n";
 124 }
 125
 126 sub flush {
 127         run("$IPTABLES -F $CHAIN_INPUT");
 128         run("$IPTABLES -F $CHAIN_FORWARD");
 129         run("$IPTABLES -F $CHAIN_OUTPUT");
 130         run("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE");
 131         run("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION");
 132         run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX");
 133 }
 134
 135 sub preparerules {
 136         if (! -z  "${General::swroot}/firewall/config"){
 137                 &buildrules(\%configfwdfw);
 138         }
 139         if (! -z  "${General::swroot}/firewall/input"){
 140                 &buildrules(\%configinputfw);
 141         }
 142         if (! -z  "${General::swroot}/firewall/outgoing"){
 143                 &buildrules(\%configoutgoingfw);
 144         }
 145 }
 146
 147 sub buildrules {
 148         my $hash = shift;
 149
 150         foreach my $key (sort {$a <=> $b} keys %$hash) {
 151                 # Skip disabled rules.
 152                 next unless ($$hash{$key}[2] eq 'ON');
 153
 154                 if ($DEBUG) {
 155                         print_rule($$hash{$key});
 156                 }
 157
 158                 # Check if the target is valid.
 159                 my $target = $$hash{$key}[0];
 160                 if (!$target ~~ @VALID_TARGETS) {
 161                         print_error("Invalid target '$target' for rule $key");
 162                         next;
 163                 }
 164
 165                 # Check if the chain is valid.
 166                 my $chain = $$hash{$key}[1];
 167                 if (!$chain ~~ @VALID_CHAINS) {
 168                         print_error("Invalid chain '$chain' in rule $key");
 169                         next;
 170                 }
 171
 172                 # Collect all sources.
 173                 my @sources = &get_addresses($hash, $key, "src");
 174
 175                 # Collect all destinations.
 176                 my @destinations = &get_addresses($hash, $key, "tgt");
 177
 178                 # Check if logging should be enabled.
 179                 my $LOG = ($$hash{$key}[17] eq 'ON');
 180
 181                 # Check if NAT is enabled and initialize variables, that we use for that.
 182                 my $NAT = ($$hash{$key}[28] eq 'ON');
 183                 my $NAT_MODE;
 184                 if ($NAT) {
 185                         $NAT_MODE = uc($$hash{$key}[31]);
 186                 }
 187
 188                 # Set up time constraints.
 189                 my @time_options = ();
 190                 if ($$hash{$key}[18] eq 'ON') {
 191                         push(@time_options, ("-m", "time"));
 192
 193                         # Select all days of the week this match is active.
 194                         my @weekdays = ();
 195                         if ($$hash{$key}[19] ne '') {
 196                                 push (@weekdays, "Mon");
 197                         }
 198                         if ($$hash{$key}[20] ne '') {
 199                                 push (@weekdays, "Tue");
 200                         }
 201                         if ($$hash{$key}[21] ne '') {
 202                                 push (@weekdays, "Wed");
 203                         }
 204                         if ($$hash{$key}[22] ne '') {
 205                                 push (@weekdays, "Thu");
 206                         }
 207                         if ($$hash{$key}[23] ne '') {
 208                                 push (@weekdays, "Fri");
 209                         }
 210                         if ($$hash{$key}[24] ne '') {
 211                                 push (@weekdays, "Sat");
 212                         }
 213                         if ($$hash{$key}[25] ne '') {
 214                                 push (@weekdays, "Sun");
 215                         }
 216                         if (@weekdays) {
 217                                 push(@time_options, ("--weekdays", join(",", @weekdays)));
 218                         }
 219
 220                         # Convert start time.
 221                         my $time_start = &format_time($$hash{$key}[26]);
 222                         if ($time_start) {
 223                                 push(@time_options, ("--timestart", $time_start));
 224                         }
 225
 226                         # Convert end time.
 227                         my $time_stop = &format_time($$hash{$key}[27]);
 228                         if ($time_stop) {
 229                                 push(@time_options, ("--timestop", $time_stop));
 230                         }
 231                 }
 232
 233                 # Check which protocols are used in this rule and so that we can
 234                 # later group rules by protocols.
 235                 my @protocols = &get_protocols($hash, $key);
 236                 if (!@protocols) {
 237                         print_error("Invalid protocol configuration for rule $key");
 238                         next;
 239                 }
 240
 241                 foreach my $protocol (@protocols) {
 242                         # Check if the given protocol is supported.
 243                         if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) {
 244                                 print_error("Protocol $protocol is not supported (rule $key)");
 245                                 next;
 246                         }
 247
 248                         # Prepare protocol options (like ICMP types, ports, etc...).
 249                         my @protocol_options = &get_protocol_options($hash, $key, $protocol);
 250
 251                         # Check if this protocol knows ports.
 252                         my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS);
 253
 254                         foreach my $source (@sources) {
 255                                 foreach my $destination (@destinations) {
 256                                         # Skip invalid rules.
 257                                         next if (!$source || !$destination || ($destination eq "none"));
 258
 259                                         # Sanitize source.
 260                                         if ($source ~~ @ANY_ADDRESSES) {
 261                                                 $source = "";
 262                                         }
 263
 264                                         # Sanitize destination.
 265                                         if ($destination ~~ @ANY_ADDRESSES) {
 266                                                 $destination = "";
 267                                         }
 268
 269                                         # Array with iptables arguments.
 270                                         my @options = ();
 271
 272                                         # Append protocol.
 273                                         if ($protocol ne "all") {
 274                                                 push(@options, ("-p", $protocol));
 275                                                 push(@options, @protocol_options);
 276                                         }
 277
 278                                         # Prepare source options.
 279                                         my @source_options = ();
 280                                         if ($source =~ /mac/) {
 281                                                 push(@source_options, $source);
 282                                         } elsif ($source) {
 283                                                 push(@source_options, ("-s", $source));
 284                                         }
 285
 286                                         # Prepare destination options.
 287                                         my @destination_options = ();
 288                                         if ($destination) {
 289                                                 push(@destination_options, ("-d", $destination));
 290                                         }
 291
 292                                         # Add time constraint options.
 293                                         push(@options, @time_options);
 294
 295                                         my $firewall_is_in_source_subnet = 0;
 296                                         if ($source) {
 297                                                 $firewall_is_in_source_subnet = &firewall_is_in_subnet($source);
 298                                         }
 299
 300                                         # Process NAT rules.
 301                                         if ($NAT) {
 302                                                 my $nat_address = &get_nat_address($$hash{$key}[29], $source);
 303
 304                                                 # Skip NAT rules if the NAT address is unknown
 305                                                 # (i.e. no internet connection has been established, yet).
 306                                                 next unless ($nat_address);
 307
 308                                                 # Destination NAT
 309                                                 if ($NAT_MODE eq "DNAT") {
 310                                                         # Make port-forwardings useable from the internal networks.
 311                                                         my @internal_addresses = &get_internal_firewall_ip_addresses(1);
 312                                                         unless ($nat_address ~~ @internal_addresses) {
 313                                                                 &add_dnat_mangle_rules($nat_address, @options);
 314                                                         }
 315
 316                                                         my @nat_options = @options;
 317                                                         push(@nat_options, @source_options);
 318                                                         push(@nat_options, ("-d", $nat_address));
 319
 320                                                         my ($dnat_address, $dnat_mask) = split("/", $destination);
 321                                                         @destination_options = ("-d", $dnat_address);
 322
 323                                                         if ($protocol_has_ports) {
 324                                                                 my $dnat_port = &get_dnat_target_port($hash, $key);
 325
 326                                                                 if ($dnat_port) {
 327                                                                         $dnat_address .= ":$dnat_port";
 328                                                                 }
 329                                                         }
 330
 331                                                         if ($LOG) {
 332                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '");
 333                                                         }
 334                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options -j DNAT --to-destination $dnat_address");
 335
 336                                                 # Source NAT
 337                                                 } elsif ($NAT_MODE eq "SNAT") {
 338                                                         my @nat_options = @options;
 339
 340                                                         push(@nat_options, @source_options);
 341                                                         push(@nat_options, @destination_options);
 342
 343                                                         if ($LOG) {
 344                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @log_limit_options -j LOG --log-prefix 'SNAT '");
 345                                                         }
 346                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options -j SNAT --to-source $nat_address");
 347                                                 }
 348                                         }
 349
 350                                         push(@options, @source_options);
 351
 352                                         if ($firewall_is_in_source_subnet && ($fwdfwsettings{"POLICY"} eq "MODE1") && ($chain eq $CHAIN_FORWARD)) {
 353                                                 if ($LOG && !$NAT) {
 354                                                         run("$IPTABLES -A $CHAIN_INPUT @options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '");
 355                                                 }
 356                                                 run("$IPTABLES -A $CHAIN_INPUT @options -j $target");
 357                                         }
 358
 359                                         push(@options, @destination_options);
 360
 361                                         # Insert firewall rule.
 362                                         if ($LOG && !$NAT) {
 363                                                 run("$IPTABLES -A $chain @options @log_limit_options -j LOG --log-prefix '$chain '");
 364                                         }
 365                                         run("$IPTABLES -A $chain @options -j $target");
 366                                 }
 367                         }
 368                 }
 369         }
 370 }
 371
 372 sub get_external_interface() {
 373         open(IFACE, "/var/ipfire/red/iface") or return "";
 374         my $iface = <IFACE>;
 375         close(IFACE);
 376
 377         return $iface;
 378 }
 379
 380 sub get_external_address() {
 381         open(ADDR, "/var/ipfire/red/local-ipaddress") or return "";
 382         my $address = <ADDR>;
 383         close(ADDR);
 384
 385         return $address;
 386 }
 387
 388 sub get_alias {
 389         my $id = shift;
 390
 391         foreach my $alias (sort keys %aliases) {
 392                 if ($id eq $alias) {
 393                         return $aliases{$alias};
 394                 }
 395         }
 396 }
 397
 398 sub get_nat_address {
 399         my $zone = shift;
 400         my $source = shift;
 401
 402         # Any static address of any zone.
 403         if ($zone eq "AUTO") {
 404                 if ($source) {
 405                         my $firewall_ip = &get_internal_firewall_ip_address($source, 1);
 406                         if ($firewall_ip) {
 407                                 return $firewall_ip;
 408                         }
 409
 410                         $firewall_ip = &get_matching_firewall_address($source, 1);
 411                         if ($firewall_ip) {
 412                                 return $firewall_ip;
 413                         }
 414                 }
 415
 416                 return &get_external_address();
 417
 418         } elsif ($zone eq "RED" || $zone eq "GREEN" || $zone eq "ORANGE" || $zone eq "BLUE") {
 419                 return $defaultNetworks{$zone . "_ADDRESS"};
 420
 421         } elsif ($zone eq "Default IP") {
 422                 return &get_external_address();
 423
 424         } else {
 425                 return &get_alias($zone);
 426         }
 427
 428         print_error("Could not find NAT address");
 429 }
 430
 431 # Formats the given timestamp into the iptables format which is "hh:mm" UTC.
 432 sub format_time {
 433         my $val = shift;
 434
 435         # Convert the given time into minutes.
 436         my $minutes = &time_convert_to_minutes($val);
 437
 438         # Move the timestamp into UTC.
 439         $minutes += &time_utc_offset();
 440
 441         # Make sure $minutes is between 00:00 and 23:59.
 442         if ($minutes < 0) {
 443                 $minutes += 1440;
 444         }
 445
 446         if ($minutes > 1440) {
 447                 $minutes -= 1440;
 448         }
 449
 450         # Format as hh:mm.
 451         return sprintf("%02d:%02d", $minutes / 60, $minutes % 60);
 452 }
 453
 454 # Calculates the offsets in minutes from the local timezone to UTC.
 455 sub time_utc_offset {
 456         my @localtime = localtime(time);
 457         my @gmtime = gmtime(time);
 458
 459         return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60);
 460 }
 461
 462 # Takes a timestamp like "14:00" and converts it into minutes since midnight.
 463 sub time_convert_to_minutes {
 464         my ($hrs, $min) = split(":", shift);
 465
 466         return ($hrs * 60) + $min;
 467 }
 468
 469 sub p2pblock {
 470         my $P2PSTRING = "";
 471         my $DO;
 472         open( FILE, "< $p2pfile" ) or die "Unable to read $p2pfile";
 473         @p2ps = <FILE>;
 474         close FILE;
 475         my $CMD = "-m ipp2p";
 476         foreach my $p2pentry (sort @p2ps) {
 477                 my @p2pline = split( /\;/, $p2pentry );
 478                 if ( $fwdfwsettings{'POLICY'} eq 'MODE1' ) {
 479                         $DO = "ACCEPT";
 480                         if ("$p2pline[2]" eq "on") {
 481                                 $P2PSTRING = "$P2PSTRING --$p2pline[1]";
 482                         }
 483                 }else {
 484                         $DO = "RETURN";
 485                         if ("$p2pline[2]" eq "off") {
 486                                 $P2PSTRING = "$P2PSTRING --$p2pline[1]";
 487                         }
 488                 }
 489         }
 490
 491         if($P2PSTRING) {
 492                 run("$IPTABLES -A FORWARDFW $CMD $P2PSTRING -j $DO");
 493         }
 494 }
 495
 496 sub get_addresses {
 497         my $hash = shift;
 498         my $key  = shift;
 499         my $type = shift;
 500
 501         my @addresses = ();
 502         my $addr_type;
 503         my $value;
 504         my $group_name;
 505
 506         if ($type eq "src") {
 507                 $addr_type = $$hash{$key}[3];
 508                 $value = $$hash{$key}[4];
 509
 510         } elsif ($type eq "tgt") {
 511                 $addr_type = $$hash{$key}[5];
 512                 $value = $$hash{$key}[6];
 513         }
 514
 515         if ($addr_type ~~ ["cust_grp_src", "cust_grp_tgt"]) {
 516                 foreach my $grp (sort {$a <=> $b} keys %customgrp) {
 517                         if ($customgrp{$grp}[0] eq $value) {
 518                                 my @address = &get_address($customgrp{$grp}[3], $customgrp{$grp}[2], $type);
 519
 520                                 if (@address) {
 521                                         push(@addresses, @address);
 522                                 }
 523                         }
 524                 }
 525         } else {
 526                 my @address = &get_address($addr_type, $value, $type);
 527
 528                 if (@address) {
 529                         push(@addresses, @address);
 530                 }
 531         }
 532
 533         return @addresses;
 534 }
 535
 536 sub get_address {
 537         my $key   = shift;
 538         my $value = shift;
 539         my $type  = shift;
 540
 541         my @ret = ();
 542
 543         # If the user manually typed an address, we just check if it is a MAC
 544         # address. Otherwise, we assume that it is an IP address.
 545         if ($key ~~ ["src_addr", "tgt_addr"]) {
 546                 if (&General::validmac($value)) {
 547                         push(@ret, "-m mac --mac-source $value");
 548                 } else {
 549                         push(@ret, $value);
 550                 }
 551
 552         # If a default network interface (GREEN, BLUE, etc.) is selected, we
 553         # try to get the corresponding address of the network.
 554         } elsif ($key ~~ ["std_net_src", "std_net_tgt", "Standard Network"]) {
 555                 my $external_interface = &get_external_interface();
 556
 557                 my $network_address = &fwlib::get_std_net_ip($value, $external_interface);
 558                 if ($network_address) {
 559                         push(@ret, $network_address);
 560                 }
 561
 562         # Custom networks.
 563         } elsif ($key ~~ ["cust_net_src", "cust_net_tgt", "Custom Network"]) {
 564                 my $network_address = &fwlib::get_net_ip($value);
 565                 if ($network_address) {
 566                         push(@ret, $network_address);
 567                 }
 568
 569         # Custom hosts.
 570         } elsif ($key ~~ ["cust_host_src", "cust_host_tgt", "Custom Host"]) {
 571                 my $host_address = &fwlib::get_host_ip($value, $type);
 572                 if ($host_address) {
 573                         push(@ret, $host_address);
 574                 }
 575
 576         # OpenVPN networks.
 577         } elsif ($key ~~ ["ovpn_net_src", "ovpn_net_tgt", "OpenVPN static network"]) {
 578                 my $network_address = &fwlib::get_ovpn_net_ip($value, 1);
 579                 if ($network_address) {
 580                         push(@ret, $network_address);
 581                 }
 582
 583         # OpenVPN hosts.
 584         } elsif ($key ~~ ["ovpn_host_src", "ovpn_host_tgt", "OpenVPN static host"]) {
 585                 my $host_address = &fwlib::get_ovpn_host_ip($value, 33);
 586                 if ($host_address) {
 587                         push(@ret, $host_address);
 588                 }
 589
 590         # OpenVPN N2N.
 591         } elsif ($key ~~ ["ovpn_n2n_src", "ovpn_n2n_tgt", "OpenVPN N-2-N"]) {
 592                 my $network_address = &fwlib::get_ovpn_n2n_ip($value, 11);
 593                 if ($network_address) {
 594                         push(@ret, $network_address);
 595                 }
 596
 597         # IPsec networks.
 598         } elsif ($key ~~ ["ipsec_net_src", "ipsec_net_tgt", "IpSec Network"]) {
 599                 my $network_address = &fwlib::get_ipsec_net_ip($value, 11);
 600                 if ($network_address) {
 601                         push(@ret, $network_address);
 602                 }
 603
 604         # The firewall's own IP addresses.
 605         } elsif ($key ~~ ["ipfire", "ipfire_src"]) {
 606                 # ALL
 607                 if ($value eq "ALL") {
 608                         push(@ret, "0/0");
 609
 610                 # GREEN
 611                 } elsif ($value eq "GREEN") {
 612                         push(@ret, $defaultNetworks{"GREEN_ADDRESS"});
 613
 614                 # BLUE
 615                 } elsif ($value eq "BLUE") {
 616                         push(@ret, $defaultNetworks{"BLUE_ADDRESS"});
 617
 618                 # ORANGE
 619                 } elsif ($value eq "ORANGE") {
 620                         push(@ret, $defaultNetworks{"ORANGE_ADDRESS"});
 621
 622                 # RED
 623                 } elsif ($value ~~ ["RED", "RED1"]) {
 624                         my $address = &get_external_address();
 625                         if ($address) {
 626                                 push(@ret, $address);
 627                         }
 628
 629                 # Aliases
 630                 } else {
 631                         my %alias = &get_alias($value);
 632                         if (%alias) {
 633                                 push(@ret, $alias{"IPT"});
 634                         }
 635                 }
 636
 637         # If nothing was selected, we assume "any".
 638         } else {
 639                 push(@ret, "0/0");
 640         }
 641
 642         return @ret;
 643 }
 644
 645 sub get_protocols {
 646         my $hash = shift;
 647         my $key = shift;
 648
 649         my $uses_source_ports = ($$hash{$key}[7] eq "ON");
 650         my $uses_services = ($$hash{$key}[11] eq "ON");
 651
 652         my @protocols = ();
 653
 654         # Rules which don't have source ports or services (like ICMP, ESP, ...).
 655         if (!$uses_source_ports && !$uses_services) {
 656                 push(@protocols, $$hash{$key}[8]);
 657
 658         # Rules which either use ports or services.
 659         } elsif ($uses_source_ports || $uses_services) {
 660                 # Check if service group or service
 661                 if ($$hash{$key}[14] eq 'cust_srv') {
 662                         push(@protocols, &fwlib::get_srv_prot($$hash{$key}[15]));
 663
 664                 } elsif($$hash{$key}[14] eq 'cust_srvgrp'){
 665                         my $protos = &fwlib::get_srvgrp_prot($$hash{$key}[15]);
 666                         push(@protocols, split(",", $protos));
 667
 668                 } else {
 669                         # Fetch the protocol for this rule.
 670                         my $protocol = lc($$hash{$key}[8]);
 671
 672                         # Fetch source and destination ports for this rule.
 673                         my $source_ports = $$hash{$key}[10];
 674                         my $destination_ports = $$hash{$key}[15];
 675
 676                         # Check if ports are set for protocols which do not support ports.
 677                         if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) {
 678                                 print_error("$protocol does not support ports");
 679                                 return ();
 680                         }
 681
 682                         push(@protocols, $protocol);
 683                 }
 684         }
 685
 686         # Remove all empty elements
 687         @protocols = map { $_ ? $_ : () } @protocols;
 688
 689         # If no protocol has been defined, we assume "all".
 690         if (!@protocols) {
 691                 push(@protocols, "all");
 692         }
 693
 694         # Make all protocol names lowercase.
 695         @protocols = map { lc } @protocols;
 696
 697         return @protocols;
 698 }
 699
 700 sub get_protocol_options {
 701         my $hash = shift;
 702         my $key  = shift;
 703         my $protocol = shift;
 704         my @options = ();
 705
 706         # Process source ports.
 707         my $use_src_ports = ($$hash{$key}[7] eq "ON");
 708         my $src_ports     = $$hash{$key}[10];
 709
 710         if ($use_src_ports && $src_ports) {
 711                 push(@options, &format_ports($src_ports, "src"));
 712         }
 713
 714         # Process destination ports.
 715         my $use_dst_ports  = ($$hash{$key}[11] eq "ON");
 716         my $use_dnat       = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat"));
 717
 718         if ($use_dst_ports) {
 719                 my $dst_ports_mode = $$hash{$key}[14];
 720                 my $dst_ports      = $$hash{$key}[15];
 721
 722                 if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) {
 723                         if ($use_dnat && $$hash{$key}[30]) {
 724                                 $dst_ports = $$hash{$key}[30];
 725                         }
 726                         push(@options, &format_ports($dst_ports, "dst"));
 727
 728                 } elsif ($dst_ports_mode eq "cust_srv") {
 729                         if ($protocol eq "ICMP") {
 730                                 push(@options, ("--icmp-type", &fwlib::get_srv_port($dst_ports, 3, "ICMP")));
 731                         } else {
 732                                 $dst_ports = &fwlib::get_srv_port($dst_ports, 1, uc($protocol));
 733                                 push(@options, &format_ports($dst_ports, "dst"));
 734                         }
 735
 736                 } elsif ($dst_ports_mode eq "cust_srvgrp") {
 737                         push(@options, &fwlib::get_srvgrp_port($dst_ports, uc($protocol)));
 738                 }
 739         }
 740
 741         # Check if a single ICMP type is selected.
 742         if (!$use_src_ports && !$use_dst_ports && $protocol eq "icmp") {
 743                 my $icmp_type = $$hash{$key}[9];
 744
 745                 if (($icmp_type ne "All ICMP-Types") && $icmp_type) {
 746                         push(@options, ("--icmp-type", $icmp_type));
 747                 }
 748         }
 749
 750         return @options;
 751 }
 752
 753 sub format_ports {
 754         my $ports = shift;
 755         my $type = shift;
 756
 757         my $arg;
 758         if ($type eq "src") {
 759                 $arg = "--sport";
 760         } elsif ($type eq "dst") {
 761                 $arg = "--dport";
 762         }
 763
 764         my @options = ();
 765
 766         if ($ports =~ /\|/) {
 767                 $ports =~ s/\|/,/g;
 768                 push(@options, ("-m", "multiport"));
 769         }
 770
 771         if ($ports) {
 772                 push(@options, ($arg, $ports));
 773         }
 774
 775         return @options;
 776 }
 777
 778 sub get_dnat_target_port {
 779         my $hash = shift;
 780         my $key  = shift;
 781
 782         if ($$hash{$key}[14] eq "TGT_PORT") {
 783                 my $port = $$hash{$key}[15];
 784                 my $external_port = $$hash{$key}[30];
 785
 786                 if ($external_port && ($port ne $external_port)) {
 787                         return $$hash{$key}[15];
 788                 }
 789         }
 790 }
 791
 792 sub add_dnat_mangle_rules {
 793         my $nat_address = shift;
 794         my @options = @_;
 795
 796         my $mark = 0;
 797         foreach my $zone ("GREEN", "BLUE", "ORANGE") {
 798                 $mark++;
 799
 800                 # Skip rule if not all required information exists.
 801                 next unless (exists $defaultNetworks{$zone . "_NETADDRESS"});
 802                 next unless (exists $defaultNetworks{$zone . "_NETMASK"});
 803
 804                 my @mangle_options = @options;
 805
 806                 my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"};
 807                 $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"};
 808
 809                 push(@mangle_options, ("-s", $netaddress, "-d", $nat_address));
 810                 push(@mangle_options, ("-j", "MARK", "--set-mark", $mark));
 811
 812                 run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options");
 813         }
 814 }
 815
 816 sub make_log_limit_options {
 817         my @options = ("-m", "limit");
 818
 819         # Maybe we should get this from the configuration.
 820         my $limit = 10;
 821
 822         # We limit log messages to $limit messages per minute.
 823         push(@options, ("--limit", "$limit/min"));
 824
 825         # And we allow bursts of 2x $limit.
 826         push(@options, ("--limit-burst", $limit * 2));
 827
 828         return @options;
 829 }
 830
 831 sub get_internal_firewall_ip_addresses {
 832         my $use_orange = shift;
 833
 834         my @zones = ("GREEN", "BLUE");
 835         if ($use_orange) {
 836                 push(@zones, "ORANGE");
 837         }
 838
 839         my @addresses = ();
 840         for my $zone (@zones) {
 841                 next unless (exists $defaultNetworks{$zone . "_ADDRESS"});
 842
 843                 my $zone_address = $defaultNetworks{$zone . "_ADDRESS"};
 844                 push(@addresses, $zone_address);
 845         }
 846
 847         return @addresses;
 848 }
 849
 850 sub get_internal_firewall_ip_address {
 851         my $subnet = shift;
 852         my $use_orange = shift;
 853
 854         my ($net_address, $net_mask) = split("/", $subnet);
 855         if ((!$net_mask) || ($net_mask ~~ ["32", "255.255.255.255"])) {
 856                 return 0;
 857         }
 858
 859         my @addresses = &get_internal_firewall_ip_addresses($use_orange);
 860         foreach my $zone_address (@addresses) {
 861                 if (&General::IpInSubnet($zone_address, $net_address, $net_mask)) {
 862                         return $zone_address;
 863                 }
 864         }
 865
 866         return 0;
 867 }
 868
 869 sub firewall_is_in_subnet {
 870         my $subnet = shift;
 871
 872         # ORANGE is missing here, because nothing may ever access
 873         # the firewall from this network.
 874         my $address = &get_internal_firewall_ip_address($subnet, 0);
 875
 876         if ($address) {
 877                 return 1;
 878         }
 879
 880         return 0;
 881 }
 882
 883 sub get_matching_firewall_address {
 884         my $addr = shift;
 885         my $use_orange = shift;
 886
 887         my ($address, $netmask) = split("/", $addr);
 888
 889         my @zones = ("GREEN", "BLUE");
 890         if ($use_orange) {
 891                 push(@zones, "ORANGE");
 892         }
 893
 894         foreach my $zone (@zones) {
 895                 next unless (exists $defaultNetworks{$zone . "_ADDRESS"});
 896
 897                 my $zone_subnet = $defaultNetworks{$zone . "_NETADDRESS"};
 898                 my $zone_mask   = $defaultNetworks{$zone . "_NETMASK"};
 899
 900                 if (&General::IpInSubnet($address, $zone_subnet, $zone_mask)) {
 901                         return $defaultNetworks{$zone . "_ADDRESS"};
 902                 }
 903         }
 904
 905         return 0;
 906 }