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