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 %fwoptions = ();
  51 my %defaultNetworks=();
  52 my %configfwdfw=();;
  53 my %customgrp=();
  54 my %configinputfw=();
  55 my %configoutgoingfw=();
  56 my %confignatfw=();
  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 $geoipfile           = "${General::swroot}/firewall/geoipblock";
  64 my $configgrp           = "${General::swroot}/fwhosts/customgroups";
  65 my $netsettings         = "${General::swroot}/ethernet/settings";
  66
  67 &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings);
  68 &General::readhash("${General::swroot}/optionsfw/settings", \%fwoptions);
  69 &General::readhash("$netsettings", \%defaultNetworks);
  70 &General::readhasharray($configfwdfw, \%configfwdfw);
  71 &General::readhasharray($configinput, \%configinputfw);
  72 &General::readhasharray($configoutgoing, \%configoutgoingfw);
  73 &General::readhasharray($configgrp, \%customgrp);
  74
  75 my @log_limit_options = &make_log_limit_options();
  76
  77 my $POLICY_INPUT_ALLOWED   = 0;
  78 my $POLICY_FORWARD_ALLOWED = ($fwdfwsettings{"POLICY"} eq "MODE2");
  79 my $POLICY_OUTPUT_ALLOWED  = ($fwdfwsettings{"POLICY1"} eq "MODE2");
  80
  81 my $POLICY_INPUT_ACTION    = $fwoptions{"FWPOLICY2"};
  82 my $POLICY_FORWARD_ACTION  = $fwoptions{"FWPOLICY"};
  83 my $POLICY_OUTPUT_ACTION   = $fwoptions{"FWPOLICY1"};
  84
  85 # MAIN
  86 &main();
  87
  88 sub main {
  89         # Flush all chains.
  90         &flush();
  91
  92         # Reload firewall rules.
  93         &preparerules();
  94
  95         # Load P2P block rules.
  96         &p2pblock();
  97
  98         # Load GeoIP block rules.
  99         &geoipblock();
 100
 101         # Reload firewall policy.
 102         run("/usr/sbin/firewall-policy");
 103 }
 104
 105 sub run {
 106         # Executes or prints the given shell command.
 107         my $command = shift;
 108
 109         if ($DEBUG) {
 110                 print "$command\n";
 111         } else {
 112                 system "$command";
 113
 114                 if ($?) {
 115                         print_error("ERROR: $command");
 116                 }
 117         }
 118 }
 119
 120 sub print_error {
 121         my $message = shift;
 122
 123         print STDERR "$message\n";
 124 }
 125
 126 sub print_rule {
 127         my $hash = shift;
 128
 129         print "\nRULE:";
 130
 131         my $i = 0;
 132         foreach (@$hash) {
 133                 printf("  %2d: %s", $i++, $_);
 134         }
 135         print "\n";
 136 }
 137
 138 sub count_elements {
 139         my $hash = shift;
 140
 141         return scalar @$hash;
 142 }
 143
 144 sub flush {
 145         run("$IPTABLES -F $CHAIN_INPUT");
 146         run("$IPTABLES -F $CHAIN_FORWARD");
 147         run("$IPTABLES -F $CHAIN_OUTPUT");
 148         run("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE");
 149         run("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION");
 150         run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX");
 151 }
 152
 153 sub preparerules {
 154         if (! -z  "${General::swroot}/firewall/input"){
 155                 &buildrules(\%configinputfw);
 156         }
 157         if (! -z  "${General::swroot}/firewall/outgoing"){
 158                 &buildrules(\%configoutgoingfw);
 159         }
 160         if (! -z  "${General::swroot}/firewall/config"){
 161                 &buildrules(\%configfwdfw);
 162         }
 163 }
 164
 165 sub buildrules {
 166         my $hash = shift;
 167
 168         # Search for targets that need to be specially handled when adding
 169         # forwarding rules. Additional rules will automatically get inserted
 170         # into the INPUT/OUTPUT chains for these targets.
 171         my @special_input_targets = ();
 172         if (!$POLICY_FORWARD_ALLOWED) {
 173                 push(@special_input_targets, "ACCEPT");
 174         }
 175
 176         if ($POLICY_INPUT_ACTION eq "DROP") {
 177                 push(@special_input_targets, "REJECT");
 178         } elsif ($POLICY_INPUT_ACTION eq "REJECT") {
 179                 push(@special_input_targets, "DROP");
 180         }
 181
 182         my @special_output_targets = ();
 183         if ($POLICY_OUTPUT_ALLOWED) {
 184                 push(@special_output_targets, ("DROP", "REJECT"));
 185         } else {
 186                 push(@special_output_targets, "ACCEPT");
 187
 188                 if ($POLICY_OUTPUT_ACTION eq "DROP") {
 189                         push(@special_output_targets, "REJECT");
 190                 } elsif ($POLICY_OUTPUT_ACTION eq "REJECT") {
 191                         push(@special_output_targets, "DROP");
 192                 }
 193         }
 194
 195         foreach my $key (sort {$a <=> $b} keys %$hash) {
 196                 # Skip disabled rules.
 197                 next unless ($$hash{$key}[2] eq 'ON');
 198
 199                 # Count number of elements in this line
 200                 my $elements = &count_elements($$hash{$key});
 201
 202                 if ($DEBUG) {
 203                         print_rule($$hash{$key});
 204                 }
 205
 206                 # Check if the target is valid.
 207                 my $target = $$hash{$key}[0];
 208                 if (!$target ~~ @VALID_TARGETS) {
 209                         print_error("Invalid target '$target' for rule $key");
 210                         next;
 211                 }
 212
 213                 # Check if the chain is valid.
 214                 my $chain = $$hash{$key}[1];
 215                 if (!$chain ~~ @VALID_CHAINS) {
 216                         print_error("Invalid chain '$chain' in rule $key");
 217                         next;
 218                 }
 219
 220                 # Collect all sources.
 221                 my @sources = &fwlib::get_addresses($hash, $key, "src");
 222
 223                 # Collect all destinations.
 224                 my @destinations = &fwlib::get_addresses($hash, $key, "tgt");
 225
 226                 # True if the destination is the firewall itself.
 227                 my $destination_is_firewall = ($$hash{$key}[5] eq "ipfire");
 228
 229                 # Check if logging should be enabled.
 230                 my $LOG = ($$hash{$key}[17] eq 'ON');
 231
 232                 # Check if NAT is enabled and initialize variables, that we use for that.
 233                 my $NAT = ($$hash{$key}[28] eq 'ON');
 234                 my $NAT_MODE;
 235                 if ($NAT) {
 236                         $NAT_MODE = uc($$hash{$key}[31]);
 237                 }
 238
 239                 # Set up time constraints.
 240                 my @time_options = ();
 241                 if ($$hash{$key}[18] eq 'ON') {
 242                         push(@time_options, ("-m", "time"));
 243
 244                         # Select all days of the week this match is active.
 245                         my @weekdays = ();
 246                         if ($$hash{$key}[19] ne '') {
 247                                 push (@weekdays, "Mon");
 248                         }
 249                         if ($$hash{$key}[20] ne '') {
 250                                 push (@weekdays, "Tue");
 251                         }
 252                         if ($$hash{$key}[21] ne '') {
 253                                 push (@weekdays, "Wed");
 254                         }
 255                         if ($$hash{$key}[22] ne '') {
 256                                 push (@weekdays, "Thu");
 257                         }
 258                         if ($$hash{$key}[23] ne '') {
 259                                 push (@weekdays, "Fri");
 260                         }
 261                         if ($$hash{$key}[24] ne '') {
 262                                 push (@weekdays, "Sat");
 263                         }
 264                         if ($$hash{$key}[25] ne '') {
 265                                 push (@weekdays, "Sun");
 266                         }
 267                         if (@weekdays) {
 268                                 push(@time_options, ("--weekdays", join(",", @weekdays)));
 269                         }
 270
 271                         # Convert start time.
 272                         my $time_start = &format_time($$hash{$key}[26]);
 273                         if ($time_start) {
 274                                 push(@time_options, ("--timestart", $time_start));
 275                         }
 276
 277                         # Convert end time.
 278                         my $time_stop = &format_time($$hash{$key}[27]);
 279                         if ($time_stop) {
 280                                 push(@time_options, ("--timestop", $time_stop));
 281                         }
 282                 }
 283
 284                 # Concurrent connection limit
 285                 my @ratelimit_options = ();
 286
 287                 if (($elements ge 34) && ($$hash{$key}[32] eq 'ON')) {
 288                         my $conn_limit = $$hash{$key}[33];
 289
 290                         if ($conn_limit ge 1) {
 291                                 push(@ratelimit_options, ("-m", "connlimit"));
 292
 293                                 # Use the the entire source IP address
 294                                 push(@ratelimit_options, "--connlimit-saddr");
 295                                 push(@ratelimit_options, ("--connlimit-mask", "32"));
 296
 297                                 # Apply the limit
 298                                 push(@ratelimit_options, ("--connlimit-upto", $conn_limit));
 299                         }
 300                 }
 301
 302                 # Ratelimit
 303                 if (($elements ge 37) && ($$hash{$key}[34] eq 'ON')) {
 304                         my $rate_limit = "$$hash{$key}[35]/$$hash{$key}[36]";
 305
 306                         if ($rate_limit) {
 307                                 push(@ratelimit_options, ("-m", "limit"));
 308                                 push(@ratelimit_options, ("--limit", $rate_limit));
 309                         }
 310                 }
 311
 312                 # Check which protocols are used in this rule and so that we can
 313                 # later group rules by protocols.
 314                 my @protocols = &get_protocols($hash, $key);
 315                 if (!@protocols) {
 316                         print_error("Invalid protocol configuration for rule $key");
 317                         next;
 318                 }
 319
 320                 foreach my $protocol (@protocols) {
 321                         # Check if the given protocol is supported.
 322                         if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) {
 323                                 print_error("Protocol $protocol is not supported (rule $key)");
 324                                 next;
 325                         }
 326
 327                         # Prepare protocol options (like ICMP types, ports, etc...).
 328                         my @protocol_options = &get_protocol_options($hash, $key, $protocol, 0);
 329
 330                         # Check if this protocol knows ports.
 331                         my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS);
 332
 333                         foreach my $src (@sources) {
 334                                 # Skip invalid source.
 335                                 next unless (defined $src);
 336                                 next unless ($src);
 337
 338                                 # Sanitize source.
 339                                 my $source = @$src[0];
 340                                 if ($source ~~ @ANY_ADDRESSES) {
 341                                         $source = "";
 342                                 }
 343
 344                                 my $source_intf = @$src[1];
 345
 346                                 foreach my $dst (@destinations) {
 347                                         # Skip invalid rules.
 348                                         next unless (defined $dst);
 349                                         next if (!$dst || ($dst eq "none"));
 350
 351                                         # Sanitize destination.
 352                                         my $destination = @$dst[0];
 353                                         if ($destination ~~ @ANY_ADDRESSES) {
 354                                                 $destination = "";
 355                                         }
 356
 357                                         my $destination_intf = @$dst[1];
 358
 359                                         # Array with iptables arguments.
 360                                         my @options = ();
 361
 362                                         # Append protocol.
 363                                         if ($protocol ne "all") {
 364                                                 push(@options, @protocol_options);
 365                                         }
 366
 367                                         # Prepare source options.
 368                                         my @source_options = ();
 369                                         if ($source =~ /mac/) {
 370                                                 push(@source_options, $source);
 371                                         } elsif ($source =~ /-m geoip/) {
 372                                                 push(@source_options, $source);
 373                                         } elsif($source) {
 374                                                 push(@source_options, ("-s", $source));
 375                                         }
 376
 377                                         # Prepare destination options.
 378                                         my @destination_options = ();
 379                                         if ($destination =~ /-m geoip/) {
 380                                                 push(@destination_options,  $destination);
 381                                         } elsif ($destination) {
 382                                                 push(@destination_options, ("-d", $destination));
 383                                         }
 384
 385                                         # Add time constraint options.
 386                                         push(@options, @time_options);
 387
 388                                         # Add ratelimiting option
 389                                         push(@options, @ratelimit_options);
 390
 391                                         my $firewall_is_in_source_subnet = 1;
 392                                         if ($source) {
 393                                                 $firewall_is_in_source_subnet = &firewall_is_in_subnet($source);
 394                                         }
 395
 396                                         my $firewall_is_in_destination_subnet = 1;
 397                                         if ($destination) {
 398                                                 $firewall_is_in_destination_subnet = &firewall_is_in_subnet($destination);
 399                                         }
 400
 401                                         # Process NAT rules.
 402                                         if ($NAT) {
 403                                                 my $nat_address = &fwlib::get_nat_address($$hash{$key}[29], $source);
 404
 405                                                 # Skip NAT rules if the NAT address is unknown
 406                                                 # (i.e. no internet connection has been established, yet).
 407                                                 next unless ($nat_address);
 408
 409                                                 # Destination NAT
 410                                                 if ($NAT_MODE eq "DNAT") {
 411                                                         my @nat_options = ();
 412                                                         if ($protocol ne "all") {
 413                                                                 my @nat_protocol_options = &get_protocol_options($hash, $key, $protocol, 1);
 414                                                                 push(@nat_options, @nat_protocol_options);
 415                                                         }
 416                                                         push(@nat_options, @time_options);
 417
 418                                                         # Make port-forwardings useable from the internal networks.
 419                                                         my @internal_addresses = &fwlib::get_internal_firewall_ip_addresses(1);
 420                                                         unless ($nat_address ~~ @internal_addresses) {
 421                                                                 &add_dnat_mangle_rules($nat_address, $source_intf, @nat_options);
 422                                                         }
 423
 424                                                         push(@nat_options, @source_options);
 425                                                         push(@nat_options, ("-d", $nat_address));
 426
 427                                                         my $dnat_port;
 428                                                         if ($protocol_has_ports) {
 429                                                                 $dnat_port = &get_dnat_target_port($hash, $key);
 430                                                         }
 431
 432                                                         my @nat_action_options = ();
 433
 434                                                         # Use iptables REDIRECT
 435                                                         my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports && $dnat_port);
 436                                                         if ($use_redirect) {
 437                                                                 push(@nat_action_options, ("-j", "REDIRECT", "--to-ports", $dnat_port));
 438
 439                                                         # Use iptables DNAT
 440                                                         } else {
 441                                                                 if ($destination_is_firewall && !$destination) {
 442                                                                         $destination = &fwlib::get_external_address();
 443                                                                 }
 444                                                                 next unless ($destination);
 445
 446                                                                 my ($dnat_address, $dnat_mask) = split("/", $destination);
 447                                                                 @destination_options = ("-d", $dnat_address);
 448
 449                                                                 if ($protocol_has_ports) {
 450                                                                         my $dnat_port = &get_dnat_target_port($hash, $key);
 451
 452                                                                         if ($dnat_port) {
 453                                                                                 $dnat_address .= ":$dnat_port";
 454                                                                         }
 455                                                                 }
 456
 457                                                                 push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address));
 458                                                         }
 459
 460                                                         if ($LOG) {
 461                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '");
 462                                                         }
 463                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options");
 464
 465                                                 # Source NAT
 466                                                 } elsif ($NAT_MODE eq "SNAT") {
 467                                                         my @nat_options = @options;
 468
 469                                                         push(@nat_options, @source_options);
 470                                                         push(@nat_options, @destination_options);
 471
 472                                                         if ($LOG) {
 473                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @log_limit_options -j LOG --log-prefix 'SNAT '");
 474                                                         }
 475                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options -j SNAT --to-source $nat_address");
 476                                                 }
 477                                         }
 478
 479                                         # Add source and destination interface to the filter rules.
 480                                         # These are supposed to help filtering forged packets that originate
 481                                         # from BLUE with an IP address from GREEN for instance.
 482                                         if ($source_intf) {
 483                                                 push(@source_options, ("-i", $source_intf));
 484                                         }
 485
 486                                         if ($destination_intf) {
 487                                                 push(@destination_options, ("-o", $destination_intf));
 488                                         }
 489
 490                                         push(@options, @source_options);
 491                                         push(@options, @destination_options);
 492
 493                                         # Insert firewall rule.
 494                                         if ($LOG && !$NAT) {
 495                                                 run("$IPTABLES -A $chain @options @log_limit_options -j LOG --log-prefix '$chain '");
 496                                         }
 497                                         run("$IPTABLES -A $chain @options -j $target");
 498
 499                                         # Handle forwarding rules and add corresponding rules for firewall access.
 500                                         if ($chain eq $CHAIN_FORWARD) {
 501                                                 # If the firewall is part of the destination subnet and access to the destination network
 502                                                 # is granted/forbidden for any network that the firewall itself is part of, we grant/forbid access
 503                                                 # for the firewall, too.
 504                                                 if ($firewall_is_in_destination_subnet && ($target ~~ @special_input_targets)) {
 505                                                         if ($LOG && !$NAT) {
 506                                                                 run("$IPTABLES -A $CHAIN_INPUT @options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '");
 507                                                         }
 508                                                         run("$IPTABLES -A $CHAIN_INPUT @options -j $target");
 509                                                 }
 510
 511                                                 # Likewise.
 512                                                 if ($firewall_is_in_source_subnet && ($target ~~ @special_output_targets)) {
 513                                                         if ($LOG && !$NAT) {
 514                                                                 run("$IPTABLES -A $CHAIN_OUTPUT @options @log_limit_options -j LOG --log-prefix '$CHAIN_OUTPUT '");
 515                                                         }
 516                                                         run("$IPTABLES -A $CHAIN_OUTPUT @options -j $target");
 517                                                 }
 518                                         }
 519                                 }
 520                         }
 521                 }
 522         }
 523         #Reload firewall.local if present
 524         if ( -f '/etc/sysconfig/firewall.local'){
 525                 run("/etc/sysconfig/firewall.local reload");
 526         }
 527 }
 528
 529 # Formats the given timestamp into the iptables format which is "hh:mm" UTC.
 530 sub format_time {
 531         my $val = shift;
 532
 533         # Convert the given time into minutes.
 534         my $minutes = &time_convert_to_minutes($val);
 535
 536         # Move the timestamp into UTC.
 537         $minutes += &time_utc_offset();
 538
 539         # Make sure $minutes is between 00:00 and 23:59.
 540         if ($minutes < 0) {
 541                 $minutes += 1440;
 542         }
 543
 544         if ($minutes > 1440) {
 545                 $minutes -= 1440;
 546         }
 547
 548         # Format as hh:mm.
 549         return sprintf("%02d:%02d", $minutes / 60, $minutes % 60);
 550 }
 551
 552 # Calculates the offsets in minutes from the local timezone to UTC.
 553 sub time_utc_offset {
 554         my @localtime = localtime(time);
 555         my @gmtime = gmtime(time);
 556
 557         return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60);
 558 }
 559
 560 # Takes a timestamp like "14:00" and converts it into minutes since midnight.
 561 sub time_convert_to_minutes {
 562         my ($hrs, $min) = split(":", shift);
 563
 564         return ($hrs * 60) + $min;
 565 }
 566
 567 sub p2pblock {
 568         open(FILE, "<$p2pfile") or die "Unable to read $p2pfile";
 569         my @protocols = ();
 570         foreach my $p2pentry (<FILE>) {
 571                 my @p2pline = split(/\;/, $p2pentry);
 572                 next unless ($p2pline[2] eq "off");
 573
 574                 push(@protocols, "--$p2pline[1]");
 575         }
 576         close(FILE);
 577
 578         run("$IPTABLES -F P2PBLOCK");
 579         if (@protocols) {
 580                 run("$IPTABLES -A P2PBLOCK -m ipp2p @protocols -j DROP");
 581         }
 582 }
 583
 584 sub geoipblock {
 585         my %geoipsettings = ();
 586
 587         # Check if the geoip settings file exists
 588         if (-e "$geoipfile") {
 589                 # Read settings file
 590                 &General::readhash("$geoipfile", \%geoipsettings);
 591         } else {
 592                 # Exit submodule, go on processing the remaining script
 593                 return;
 594         }
 595
 596         # If geoip blocking is not enabled, we are finished here.
 597         if ($geoipsettings{'GEOIPBLOCK_ENABLED'} ne "on") {
 598                 # Exit submodule. Process remaining script.
 599                 return;
 600         }
 601
 602         # Get supported locations.
 603         my @locations = &fwlib::get_geoip_locations();
 604
 605         # Create iptables chain.
 606         run("$IPTABLES -F GEOIPBLOCK");
 607
 608         # Loop through all supported geoip locations and
 609         # create iptables rules, if blocking this country
 610         # is enabled.
 611         foreach my $location (@locations) {
 612                 if($geoipsettings{$location} eq "on") {
 613                         run("$IPTABLES -A GEOIPBLOCK -m geoip --src-cc $location -j DROP");
 614                 }
 615         }
 616 }
 617
 618 sub get_protocols {
 619         my $hash = shift;
 620         my $key = shift;
 621
 622         my $uses_source_ports = ($$hash{$key}[7] eq "ON");
 623         my $uses_services = ($$hash{$key}[11] eq "ON");
 624
 625         my @protocols = ();
 626
 627         # Rules which don't have source ports or services (like ICMP, ESP, ...).
 628         if (!$uses_source_ports && !$uses_services) {
 629                 push(@protocols, $$hash{$key}[8]);
 630
 631         # Rules which either use ports or services.
 632         } elsif ($uses_source_ports || $uses_services) {
 633                 # Check if service group or service
 634                 if ($$hash{$key}[14] eq 'cust_srv') {
 635                         push(@protocols, &fwlib::get_srv_prot($$hash{$key}[15]));
 636
 637                 } elsif($$hash{$key}[14] eq 'cust_srvgrp'){
 638                         my $protos = &fwlib::get_srvgrp_prot($$hash{$key}[15]);
 639                         push(@protocols, split(",", $protos));
 640
 641                 } else {
 642                         # Fetch the protocol for this rule.
 643                         my $protocol = lc($$hash{$key}[8]);
 644
 645                         # Fetch source and destination ports for this rule.
 646                         my $source_ports = $$hash{$key}[10];
 647                         my $destination_ports = $$hash{$key}[15];
 648
 649                         # Check if ports are set for protocols which do not support ports.
 650                         if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) {
 651                                 print_error("$protocol does not support ports");
 652                                 return ();
 653                         }
 654
 655                         push(@protocols, $protocol);
 656                 }
 657         }
 658
 659         # Remove all empty elements
 660         @protocols = map { $_ ? $_ : () } @protocols;
 661
 662         # If no protocol has been defined, we assume "all".
 663         if (!@protocols) {
 664                 push(@protocols, "all");
 665         }
 666
 667         # Make all protocol names lowercase.
 668         @protocols = map { lc } @protocols;
 669
 670         return @protocols;
 671 }
 672
 673 sub get_protocol_options {
 674         my $hash = shift;
 675         my $key  = shift;
 676         my $protocol = shift;
 677         my $nat_options_wanted = shift;
 678         my @options = ();
 679
 680         # Nothing to do if no protocol is specified.
 681         if ($protocol eq "all") {
 682                 return @options;
 683         } else {
 684                 push(@options, ("-p", $protocol));
 685         }
 686
 687         if ($protocol ~~ @PROTOCOLS_WITH_PORTS) {
 688                 # Process source ports.
 689                 my $use_src_ports = ($$hash{$key}[7] eq "ON");
 690                 my $src_ports     = $$hash{$key}[10];
 691
 692                 if ($use_src_ports && $src_ports) {
 693                         push(@options, &format_ports($src_ports, "src"));
 694                 }
 695
 696                 # Process destination ports.
 697                 my $use_dst_ports  = ($$hash{$key}[11] eq "ON");
 698                 my $use_dnat       = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat"));
 699
 700                 if ($use_dst_ports) {
 701                         my $dst_ports_mode = $$hash{$key}[14];
 702                         my $dst_ports      = $$hash{$key}[15];
 703
 704                         if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) {
 705                                 if ($nat_options_wanted && $use_dnat && $$hash{$key}[30]) {
 706                                         $dst_ports = $$hash{$key}[30];
 707                                 }
 708                                 push(@options, &format_ports($dst_ports, "dst"));
 709
 710                         } elsif ($dst_ports_mode eq "cust_srv") {
 711                                 if ($protocol eq "ICMP") {
 712                                         push(@options, ("--icmp-type", &fwlib::get_srv_port($dst_ports, 3, "ICMP")));
 713                                 } else {
 714                                         $dst_ports = &fwlib::get_srv_port($dst_ports, 1, uc($protocol));
 715                                         push(@options, &format_ports($dst_ports, "dst"));
 716                                 }
 717
 718                         } elsif ($dst_ports_mode eq "cust_srvgrp") {
 719                                 push(@options, &fwlib::get_srvgrp_port($dst_ports, uc($protocol)));
 720                         }
 721                 }
 722         }
 723
 724         # Check if a single ICMP type is selected.
 725         if ($protocol eq "icmp") {
 726                 my $icmp_type = $$hash{$key}[9];
 727
 728                 if (($icmp_type ne "All ICMP-Types") && $icmp_type) {
 729                         push(@options, ("--icmp-type", $icmp_type));
 730                 }
 731         }
 732
 733         return @options;
 734 }
 735
 736 sub format_ports {
 737         my $ports = shift;
 738         my $type = shift;
 739
 740         my $arg;
 741         if ($type eq "src") {
 742                 $arg = "--sport";
 743         } elsif ($type eq "dst") {
 744                 $arg = "--dport";
 745         }
 746
 747         my @options = ();
 748
 749         if ($ports =~ /\|/) {
 750                 $ports =~ s/\|/,/g;
 751                 push(@options, ("-m", "multiport"));
 752         }
 753
 754         if ($ports) {
 755                 push(@options, ($arg, $ports));
 756         }
 757
 758         return @options;
 759 }
 760
 761 sub get_dnat_target_port {
 762         my $hash = shift;
 763         my $key  = shift;
 764
 765         if ($$hash{$key}[14] eq "TGT_PORT") {
 766                 my $port = $$hash{$key}[15];
 767                 my $external_port = $$hash{$key}[30];
 768
 769                 if ($external_port && ($port ne $external_port)) {
 770                         return $$hash{$key}[15];
 771                 }
 772         }
 773 }
 774
 775 sub add_dnat_mangle_rules {
 776         my $nat_address = shift;
 777         my $interface = shift;
 778         my @options = @_;
 779
 780         my $mark = 0;
 781         foreach my $zone ("GREEN", "BLUE", "ORANGE") {
 782                 $mark++;
 783
 784                 # Skip rule if not all required information exists.
 785                 next unless (exists $defaultNetworks{$zone . "_NETADDRESS"});
 786                 next unless (exists $defaultNetworks{$zone . "_NETMASK"});
 787
 788                 next if ($interface && $interface ne $defaultNetworks{$zone . "_DEV"});
 789
 790                 my @mangle_options = @options;
 791
 792                 my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"};
 793                 $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"};
 794
 795                 push(@mangle_options, ("-s", $netaddress, "-d", $nat_address));
 796                 push(@mangle_options, ("-j", "MARK", "--set-mark", $mark));
 797
 798                 run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options");
 799         }
 800 }
 801
 802 sub make_log_limit_options {
 803         my @options = ("-m", "limit");
 804
 805         # Maybe we should get this from the configuration.
 806         my $limit = 10;
 807
 808         # We limit log messages to $limit messages per minute.
 809         push(@options, ("--limit", "$limit/min"));
 810
 811         # And we allow bursts of 2x $limit.
 812         push(@options, ("--limit-burst", $limit * 2));
 813
 814         return @options;
 815 }
 816
 817 sub firewall_is_in_subnet {
 818         my $subnet = shift;
 819
 820         # ORANGE is missing here, because nothing may ever access
 821         # the firewall from this network.
 822         my $address = &fwlib::get_internal_firewall_ip_address($subnet, 0);
 823
 824         if ($address) {
 825                 return 1;
 826         }
 827
 828         return 0;
 829 }