config/firewall/rules.pl

   1 #!/usr/bin/perl -w
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2007-2019  IPFire Team  <info@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 use experimental 'smartmatch';
  24
  25 require '/var/ipfire/general-functions.pl';
  26 require "${General::swroot}/lang.pl";
  27 require "/usr/lib/firewall/firewall-lib.pl";
  28
  29 # Set to one to enable debugging mode.
  30 my $DEBUG = 0;
  31
  32 my $IPTABLES = "iptables --wait";
  33
  34 # iptables chains
  35 my $CHAIN_INPUT           = "INPUTFW";
  36 my $CHAIN_FORWARD         = "FORWARDFW";
  37 my $CHAIN_OUTPUT          = "OUTGOINGFW";
  38 my $CHAIN                 = $CHAIN_FORWARD;
  39 my $CHAIN_NAT_SOURCE      = "NAT_SOURCE";
  40 my $CHAIN_NAT_DESTINATION = "NAT_DESTINATION";
  41 my $CHAIN_MANGLE_NAT_DESTINATION_FIX = "NAT_DESTINATION";
  42 my @VALID_CHAINS          = ($CHAIN_INPUT, $CHAIN_FORWARD, $CHAIN_OUTPUT);
  43 my @ANY_ADDRESSES         = ("0.0.0.0/0.0.0.0", "0.0.0.0/0", "0/0");
  44
  45 my @PROTOCOLS = ("tcp", "udp", "icmp", "igmp", "ah", "esp", "gre", "ipv6", "ipip");
  46 my @PROTOCOLS_WITH_PORTS = ("tcp", "udp");
  47
  48 my @VALID_TARGETS = ("ACCEPT", "DROP", "REJECT");
  49
  50 my %fwdfwsettings=();
  51 my %fwoptions = ();
  52 my %defaultNetworks=();
  53 my %configfwdfw=();;
  54 my %customgrp=();
  55 my %configinputfw=();
  56 my %configoutgoingfw=();
  57 my %confignatfw=();
  58 my %geoipsettings = (
  59         "GEOIPBLOCK_ENABLED" => "off"
  60 );
  61
  62 my @p2ps=();
  63
  64 my $configfwdfw         = "${General::swroot}/firewall/config";
  65 my $configinput     = "${General::swroot}/firewall/input";
  66 my $configoutgoing  = "${General::swroot}/firewall/outgoing";
  67 my $p2pfile                     = "${General::swroot}/firewall/p2protocols";
  68 my $geoipfile           = "${General::swroot}/firewall/geoipblock";
  69 my $configgrp           = "${General::swroot}/fwhosts/customgroups";
  70 my $netsettings         = "${General::swroot}/ethernet/settings";
  71
  72 &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings);
  73 &General::readhash("${General::swroot}/optionsfw/settings", \%fwoptions);
  74 &General::readhash("$netsettings", \%defaultNetworks);
  75 &General::readhasharray($configfwdfw, \%configfwdfw);
  76 &General::readhasharray($configinput, \%configinputfw);
  77 &General::readhasharray($configoutgoing, \%configoutgoingfw);
  78 &General::readhasharray($configgrp, \%customgrp);
  79
  80 # Check if the geoip settings file exists
  81 if (-e "$geoipfile") {
  82         # Read settings file
  83         &General::readhash("$geoipfile", \%geoipsettings);
  84 }
  85
  86 # Get all GeoIP locations.
  87 my @locations = &fwlib::get_geoip_locations();
  88
  89 my @log_limit_options = &make_log_limit_options();
  90
  91 my $POLICY_INPUT_ALLOWED   = 0;
  92 my $POLICY_FORWARD_ALLOWED = ($fwdfwsettings{"POLICY"} eq "MODE2");
  93 my $POLICY_OUTPUT_ALLOWED  = ($fwdfwsettings{"POLICY1"} eq "MODE2");
  94
  95 my $POLICY_INPUT_ACTION    = $fwoptions{"FWPOLICY2"};
  96 my $POLICY_FORWARD_ACTION  = $fwoptions{"FWPOLICY"};
  97 my $POLICY_OUTPUT_ACTION   = $fwoptions{"FWPOLICY1"};
  98
  99 # MAIN
 100 &main();
 101
 102 sub main {
 103         # Flush all chains.
 104         &flush();
 105
 106         # Prepare firewall rules.
 107         if (! -z  "${General::swroot}/firewall/input"){
 108                 &buildrules(\%configinputfw);
 109         }
 110         if (! -z  "${General::swroot}/firewall/outgoing"){
 111                 &buildrules(\%configoutgoingfw);
 112         }
 113         if (! -z  "${General::swroot}/firewall/config"){
 114                 &buildrules(\%configfwdfw);
 115         }
 116
 117         # Load P2P block rules.
 118         &p2pblock();
 119
 120         # Load GeoIP block rules.
 121         &geoipblock();
 122
 123         # Reload firewall policy.
 124         run("/usr/sbin/firewall-policy");
 125
 126         #Reload firewall.local if present
 127         if ( -f '/etc/sysconfig/firewall.local'){
 128                 run("/etc/sysconfig/firewall.local reload");
 129         }
 130 }
 131
 132 sub run {
 133         # Executes or prints the given shell command.
 134         my $command = shift;
 135
 136         if ($DEBUG) {
 137                 print "$command\n";
 138         } else {
 139                 system "$command";
 140
 141                 if ($?) {
 142                         print_error("ERROR: $command");
 143                 }
 144         }
 145 }
 146
 147 sub print_error {
 148         my $message = shift;
 149
 150         print STDERR "$message\n";
 151 }
 152
 153 sub print_rule {
 154         my $hash = shift;
 155
 156         print "\nRULE:";
 157
 158         my $i = 0;
 159         foreach (@$hash) {
 160                 printf("  %2d: %s", $i++, $_);
 161         }
 162         print "\n";
 163 }
 164
 165 sub count_elements {
 166         my $hash = shift;
 167
 168         return scalar @$hash;
 169 }
 170
 171 sub flush {
 172         run("$IPTABLES -F $CHAIN_INPUT");
 173         run("$IPTABLES -F $CHAIN_FORWARD");
 174         run("$IPTABLES -F $CHAIN_OUTPUT");
 175         run("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE");
 176         run("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION");
 177         run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX");
 178 }
 179
 180 sub buildrules {
 181         my $hash = shift;
 182
 183         # Search for targets that need to be specially handled when adding
 184         # forwarding rules. Additional rules will automatically get inserted
 185         # into the INPUT/OUTPUT chains for these targets.
 186         my @special_input_targets = ();
 187         if (!$POLICY_FORWARD_ALLOWED) {
 188                 push(@special_input_targets, "ACCEPT");
 189         }
 190
 191         if ($POLICY_INPUT_ACTION eq "DROP") {
 192                 push(@special_input_targets, ("ACCEPT", "REJECT"));
 193         } elsif ($POLICY_INPUT_ACTION eq "REJECT") {
 194                 push(@special_input_targets, ("ACCEPT", "DROP"));
 195         }
 196
 197         my @special_output_targets = ();
 198         if ($POLICY_OUTPUT_ALLOWED) {
 199                 push(@special_output_targets, ("DROP", "REJECT"));
 200         } else {
 201                 push(@special_output_targets, "ACCEPT");
 202
 203                 if ($POLICY_OUTPUT_ACTION eq "DROP") {
 204                         push(@special_output_targets, ("ACCEPT", "REJECT"));
 205                 } elsif ($POLICY_OUTPUT_ACTION eq "REJECT") {
 206                         push(@special_output_targets, ("ACCEPT", "DROP"));
 207                 }
 208         }
 209
 210         foreach my $key (sort {$a <=> $b} keys %$hash) {
 211                 # Skip disabled rules.
 212                 next unless ($$hash{$key}[2] eq 'ON');
 213
 214                 # Count number of elements in this line
 215                 my $elements = &count_elements($$hash{$key});
 216
 217                 if ($DEBUG) {
 218                         print_rule($$hash{$key});
 219                 }
 220
 221                 # Check if the target is valid.
 222                 my $target = $$hash{$key}[0];
 223                 if (!$target ~~ @VALID_TARGETS) {
 224                         print_error("Invalid target '$target' for rule $key");
 225                         next;
 226                 }
 227
 228                 # Check if the chain is valid.
 229                 my $chain = $$hash{$key}[1];
 230                 if (!$chain ~~ @VALID_CHAINS) {
 231                         print_error("Invalid chain '$chain' in rule $key");
 232                         next;
 233                 }
 234
 235                 # Collect all sources.
 236                 my @sources = &fwlib::get_addresses($hash, $key, "src");
 237
 238                 # Collect all destinations.
 239                 my @destinations = &fwlib::get_addresses($hash, $key, "tgt");
 240
 241                 # True if the destination is the firewall itself.
 242                 my $destination_is_firewall = ($$hash{$key}[5] eq "ipfire");
 243
 244                 # Check if logging should be enabled.
 245                 my $LOG = ($$hash{$key}[17] eq 'ON');
 246
 247                 # Check if NAT is enabled and initialize variables, that we use for that.
 248                 my $NAT = ($$hash{$key}[28] eq 'ON');
 249                 my $NAT_MODE;
 250                 if ($NAT) {
 251                         $NAT_MODE = uc($$hash{$key}[31]);
 252                 }
 253
 254                 # Set up time constraints.
 255                 my @time_options = ();
 256                 if ($$hash{$key}[18] eq 'ON') {
 257                         push(@time_options, ("-m", "time"));
 258
 259                         # Select all days of the week this match is active.
 260                         my @weekdays = ();
 261                         if ($$hash{$key}[19] ne '') {
 262                                 push (@weekdays, "Mon");
 263                         }
 264                         if ($$hash{$key}[20] ne '') {
 265                                 push (@weekdays, "Tue");
 266                         }
 267                         if ($$hash{$key}[21] ne '') {
 268                                 push (@weekdays, "Wed");
 269                         }
 270                         if ($$hash{$key}[22] ne '') {
 271                                 push (@weekdays, "Thu");
 272                         }
 273                         if ($$hash{$key}[23] ne '') {
 274                                 push (@weekdays, "Fri");
 275                         }
 276                         if ($$hash{$key}[24] ne '') {
 277                                 push (@weekdays, "Sat");
 278                         }
 279                         if ($$hash{$key}[25] ne '') {
 280                                 push (@weekdays, "Sun");
 281                         }
 282                         if (@weekdays) {
 283                                 push(@time_options, ("--weekdays", join(",", @weekdays)));
 284                         }
 285
 286                         # Convert start time.
 287                         my $time_start = &format_time($$hash{$key}[26]);
 288                         if ($time_start) {
 289                                 push(@time_options, ("--timestart", $time_start));
 290                         }
 291
 292                         # Convert end time.
 293                         my $time_stop = &format_time($$hash{$key}[27]);
 294                         if ($time_stop) {
 295                                 push(@time_options, ("--timestop", $time_stop));
 296                         }
 297                 }
 298
 299                 # Concurrent connection limit
 300                 my @ratelimit_options = ();
 301
 302                 if (($elements ge 34) && ($$hash{$key}[32] eq 'ON')) {
 303                         my $conn_limit = $$hash{$key}[33];
 304
 305                         if ($conn_limit ge 1) {
 306                                 push(@ratelimit_options, ("-m", "connlimit"));
 307
 308                                 # Use the the entire source IP address
 309                                 push(@ratelimit_options, "--connlimit-saddr");
 310                                 push(@ratelimit_options, ("--connlimit-mask", "32"));
 311
 312                                 # Apply the limit
 313                                 push(@ratelimit_options, ("--connlimit-upto", $conn_limit));
 314                         }
 315                 }
 316
 317                 # Ratelimit
 318                 if (($elements ge 37) && ($$hash{$key}[34] eq 'ON')) {
 319                         my $rate_limit = "$$hash{$key}[35]/$$hash{$key}[36]";
 320
 321                         if ($rate_limit) {
 322                                 push(@ratelimit_options, ("-m", "limit"));
 323                                 push(@ratelimit_options, ("--limit", $rate_limit));
 324                         }
 325                 }
 326
 327                 # Check which protocols are used in this rule and so that we can
 328                 # later group rules by protocols.
 329                 my @protocols = &get_protocols($hash, $key);
 330                 if (!@protocols) {
 331                         print_error("Invalid protocol configuration for rule $key");
 332                         next;
 333                 }
 334
 335                 foreach my $protocol (@protocols) {
 336                         # Check if the given protocol is supported.
 337                         if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) {
 338                                 print_error("Protocol $protocol is not supported (rule $key)");
 339                                 next;
 340                         }
 341
 342                         # Prepare protocol options (like ICMP types, ports, etc...).
 343                         my @protocol_options = &get_protocol_options($hash, $key, $protocol, 0);
 344
 345                         # Check if this protocol knows ports.
 346                         my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS);
 347
 348                         foreach my $src (@sources) {
 349                                 # Skip invalid source.
 350                                 next unless (defined $src);
 351                                 next unless ($src);
 352
 353                                 # Sanitize source.
 354                                 my $source = @$src[0];
 355                                 if ($source ~~ @ANY_ADDRESSES) {
 356                                         $source = "";
 357                                 }
 358
 359                                 my $source_intf = @$src[1];
 360
 361                                 foreach my $dst (@destinations) {
 362                                         # Skip invalid rules.
 363                                         next unless (defined $dst);
 364                                         next if (!$dst || ($dst eq "none"));
 365
 366                                         # Sanitize destination.
 367                                         my $destination = @$dst[0];
 368                                         if ($destination ~~ @ANY_ADDRESSES) {
 369                                                 $destination = "";
 370                                         }
 371
 372                                         my $destination_intf = @$dst[1];
 373
 374                                         # Array with iptables arguments.
 375                                         my @options = ();
 376
 377                                         # Append protocol.
 378                                         if ($protocol ne "all") {
 379                                                 push(@options, @protocol_options);
 380                                         }
 381
 382                                         # Prepare source options.
 383                                         my @source_options = ();
 384                                         if ($source =~ /mac/) {
 385                                                 push(@source_options, $source);
 386                                         } elsif ($source =~ /-m geoip/) {
 387                                                 push(@source_options, $source);
 388                                         } elsif($source) {
 389                                                 push(@source_options, ("-s", $source));
 390                                         }
 391
 392                                         # Prepare destination options.
 393                                         my @destination_options = ();
 394                                         if ($destination =~ /-m geoip/) {
 395                                                 push(@destination_options,  $destination);
 396                                         } elsif ($destination) {
 397                                                 push(@destination_options, ("-d", $destination));
 398                                         }
 399
 400                                         # Add source and destination interface to the filter rules.
 401                                         # These are supposed to help filtering forged packets that originate
 402                                         # from BLUE with an IP address from GREEN for instance.
 403                                         my @source_intf_options = ();
 404                                         if ($source_intf) {
 405                                                 push(@source_intf_options, ("-i", $source_intf));
 406                                         }
 407
 408                                         my @destination_intf_options = ();
 409                                         if ($destination_intf) {
 410                                                 push(@destination_intf_options, ("-o", $destination_intf));
 411                                         }
 412
 413                                         # Add time constraint options.
 414                                         push(@options, @time_options);
 415
 416                                         # Add ratelimiting option
 417                                         push(@options, @ratelimit_options);
 418
 419                                         my $firewall_is_in_source_subnet = 1;
 420                                         if ($source) {
 421                                                 $firewall_is_in_source_subnet = &firewall_is_in_subnet($source);
 422                                         }
 423
 424                                         my $firewall_is_in_destination_subnet = 1;
 425                                         if ($destination) {
 426                                                 $firewall_is_in_destination_subnet = &firewall_is_in_subnet($destination);
 427                                         }
 428
 429                                         # Process NAT rules.
 430                                         if ($NAT) {
 431                                                 my $nat_address = &fwlib::get_nat_address($$hash{$key}[29], $source);
 432
 433                                                 # Skip NAT rules if the NAT address is unknown
 434                                                 # (i.e. no internet connection has been established, yet).
 435                                                 next unless ($nat_address);
 436
 437                                                 # Destination NAT
 438                                                 if ($NAT_MODE eq "DNAT") {
 439                                                         my @nat_options = ();
 440                                                         if ($protocol ne "all") {
 441                                                                 my @nat_protocol_options = &get_protocol_options($hash, $key, $protocol, 1);
 442                                                                 push(@nat_options, @nat_protocol_options);
 443                                                         }
 444                                                         push(@nat_options, @time_options);
 445
 446                                                         # Make port-forwardings useable from the internal networks.
 447                                                         my @internal_addresses = &fwlib::get_internal_firewall_ip_addresses(1);
 448                                                         unless ($nat_address ~~ @internal_addresses) {
 449                                                                 &add_dnat_mangle_rules($nat_address, $source_intf, @nat_options);
 450                                                         }
 451
 452                                                         push(@nat_options, @source_options);
 453                                                         push(@nat_options, ("-d", $nat_address));
 454
 455                                                         my $dnat_port;
 456                                                         if ($protocol_has_ports) {
 457                                                                 $dnat_port = &get_dnat_target_port($hash, $key);
 458                                                         }
 459
 460                                                         my @nat_action_options = ();
 461
 462                                                         # Use iptables REDIRECT
 463                                                         my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports && $dnat_port);
 464                                                         if ($use_redirect) {
 465                                                                 push(@nat_action_options, ("-j", "REDIRECT", "--to-ports", $dnat_port));
 466
 467                                                         # Use iptables DNAT
 468                                                         } else {
 469                                                                 if ($destination_is_firewall && !$destination) {
 470                                                                         $destination = &fwlib::get_external_address();
 471                                                                 }
 472                                                                 next unless ($destination);
 473
 474                                                                 my ($dnat_address, $dnat_mask) = split("/", $destination);
 475                                                                 @destination_options = ("-d", $dnat_address);
 476
 477                                                                 if ($protocol_has_ports) {
 478                                                                         my $dnat_port = &get_dnat_target_port($hash, $key);
 479
 480                                                                         if ($dnat_port) {
 481                                                                                 $dnat_address .= ":$dnat_port";
 482                                                                         }
 483                                                                 }
 484
 485                                                                 push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address));
 486                                                         }
 487
 488                                                         if ($LOG) {
 489                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '");
 490                                                         }
 491                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options");
 492
 493                                                 # Source NAT
 494                                                 } elsif ($NAT_MODE eq "SNAT") {
 495                                                         my @snat_options = ( "-m", "policy", "--dir", "out", "--pol", "none" );
 496                                                         my @nat_options = @options;
 497
 498                                                         # Get addresses for the configured firewall interfaces.
 499                                                         my @local_addresses = &fwlib::get_internal_firewall_ip_addresses(1);
 500
 501                                                         # Check if the nat_address is one of the local addresses.
 502                                                         foreach my $local_address (@local_addresses) {
 503                                                                 if ($nat_address eq $local_address) {
 504                                                                         # Clear SNAT options.
 505                                                                         @snat_options = ();
 506
 507                                                                         # Finish loop.
 508                                                                         last;
 509                                                                 }
 510                                                         }
 511
 512                                                         push(@nat_options, @destination_intf_options);
 513                                                         push(@nat_options, @source_options);
 514                                                         push(@nat_options, @destination_options);
 515
 516                                                         if ($LOG) {
 517                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options @log_limit_options -j LOG --log-prefix 'SNAT '");
 518                                                         }
 519                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options -j SNAT --to-source $nat_address");
 520                                                 }
 521                                         }
 522
 523                                         push(@options, @source_options);
 524                                         push(@options, @destination_options);
 525
 526                                         # Insert firewall rule.
 527                                         if ($LOG) {
 528                                                 run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options @log_limit_options -j LOG --log-prefix '$chain '");
 529                                         }
 530                                         run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options -j $target");
 531
 532                                         # Handle forwarding rules and add corresponding rules for firewall access.
 533                                         if ($chain eq $CHAIN_FORWARD) {
 534                                                 # If the firewall is part of the destination subnet and access to the destination network
 535                                                 # is granted/forbidden for any network that the firewall itself is part of, we grant/forbid access
 536                                                 # for the firewall, too.
 537                                                 if ($firewall_is_in_destination_subnet && ($target ~~ @special_input_targets)) {
 538                                                         if ($LOG) {
 539                                                                 run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '");
 540                                                         }
 541                                                         run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options -j $target");
 542                                                 }
 543
 544                                                 # Likewise.
 545                                                 if ($firewall_is_in_source_subnet && ($target ~~ @special_output_targets)) {
 546                                                         if ($LOG) {
 547                                                                 run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_OUTPUT '");
 548                                                         }
 549                                                         run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options -j $target");
 550                                                 }
 551                                         }
 552                                 }
 553                         }
 554                 }
 555         }
 556 }
 557
 558 # Formats the given timestamp into the iptables format which is "hh:mm" UTC.
 559 sub format_time {
 560         my $val = shift;
 561
 562         # Convert the given time into minutes.
 563         my $minutes = &time_convert_to_minutes($val);
 564
 565         # Move the timestamp into UTC.
 566         $minutes += &time_utc_offset();
 567
 568         # Make sure $minutes is between 00:00 and 23:59.
 569         if ($minutes < 0) {
 570                 $minutes += 1440;
 571         }
 572
 573         if ($minutes > 1440) {
 574                 $minutes -= 1440;
 575         }
 576
 577         # Format as hh:mm.
 578         return sprintf("%02d:%02d", $minutes / 60, $minutes % 60);
 579 }
 580
 581 # Calculates the offsets in minutes from the local timezone to UTC.
 582 sub time_utc_offset {
 583         my @localtime = localtime(time);
 584         my @gmtime = gmtime(time);
 585
 586         return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60);
 587 }
 588
 589 # Takes a timestamp like "14:00" and converts it into minutes since midnight.
 590 sub time_convert_to_minutes {
 591         my ($hrs, $min) = split(":", shift);
 592
 593         return ($hrs * 60) + $min;
 594 }
 595
 596 sub p2pblock {
 597         open(FILE, "<$p2pfile") or die "Unable to read $p2pfile";
 598         my @protocols = ();
 599         foreach my $p2pentry (<FILE>) {
 600                 my @p2pline = split(/\;/, $p2pentry);
 601                 next unless ($p2pline[2] eq "off");
 602
 603                 push(@protocols, "--$p2pline[1]");
 604         }
 605         close(FILE);
 606
 607         run("$IPTABLES -F P2PBLOCK");
 608         if (@protocols) {
 609                 run("$IPTABLES -A P2PBLOCK -m ipp2p @protocols -j DROP");
 610         }
 611 }
 612
 613 sub geoipblock {
 614         # Flush iptables chain.
 615         run("$IPTABLES -F LOCATIONBLOCK");
 616
 617         # If geoip blocking is not enabled, we are finished here.
 618         if ($geoipsettings{'GEOIPBLOCK_ENABLED'} ne "on") {
 619                 # Exit submodule. Process remaining script.
 620                 return;
 621         }
 622
 623         # Loop through all supported geoip locations and
 624         # create iptables rules, if blocking this country
 625         # is enabled.
 626         foreach my $location (@locations) {
 627                 if(exists $geoipsettings{$location} && $geoipsettings{$location} eq "on") {
 628                         run("$IPTABLES -A LOCATIONBLOCK -m geoip --src-cc $location -j DROP");
 629                 }
 630         }
 631 }
 632
 633 sub get_protocols {
 634         my $hash = shift;
 635         my $key = shift;
 636
 637         my $uses_source_ports = ($$hash{$key}[7] eq "ON");
 638         my $uses_services = ($$hash{$key}[11] eq "ON");
 639
 640         my @protocols = ();
 641
 642         # Rules which don't have source ports or services (like ICMP, ESP, ...).
 643         if (!$uses_source_ports && !$uses_services) {
 644                 push(@protocols, $$hash{$key}[8]);
 645
 646         # Rules which either use ports or services.
 647         } elsif ($uses_source_ports || $uses_services) {
 648                 # Check if service group or service
 649                 if ($$hash{$key}[14] eq 'cust_srv') {
 650                         push(@protocols, &fwlib::get_srv_prot($$hash{$key}[15]));
 651
 652                 } elsif($$hash{$key}[14] eq 'cust_srvgrp'){
 653                         my $protos = &fwlib::get_srvgrp_prot($$hash{$key}[15]);
 654                         push(@protocols, split(",", $protos));
 655
 656                 } else {
 657                         # Fetch the protocol for this rule.
 658                         my $protocol = lc($$hash{$key}[8]);
 659
 660                         # Fetch source and destination ports for this rule.
 661                         my $source_ports = $$hash{$key}[10];
 662                         my $destination_ports = $$hash{$key}[15];
 663
 664                         # Check if ports are set for protocols which do not support ports.
 665                         if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) {
 666                                 print_error("$protocol does not support ports");
 667                                 return ();
 668                         }
 669
 670                         push(@protocols, $protocol);
 671                 }
 672         }
 673
 674         # Remove all empty elements
 675         @protocols = map { $_ ? $_ : () } @protocols;
 676
 677         # If no protocol has been defined, we assume "all".
 678         if (!@protocols) {
 679                 push(@protocols, "all");
 680         }
 681
 682         # Make all protocol names lowercase.
 683         @protocols = map { lc } @protocols;
 684
 685         return @protocols;
 686 }
 687
 688 sub get_protocol_options {
 689         my $hash = shift;
 690         my $key  = shift;
 691         my $protocol = shift;
 692         my $nat_options_wanted = shift;
 693         my @options = ();
 694
 695         # Nothing to do if no protocol is specified.
 696         if ($protocol eq "all") {
 697                 return @options;
 698         } else {
 699                 push(@options, ("-p", $protocol));
 700         }
 701
 702         if ($protocol ~~ @PROTOCOLS_WITH_PORTS) {
 703                 # Process source ports.
 704                 my $use_src_ports = ($$hash{$key}[7] eq "ON");
 705                 my $src_ports     = $$hash{$key}[10];
 706
 707                 if ($use_src_ports && $src_ports) {
 708                         push(@options, &format_ports($src_ports, "src"));
 709                 }
 710
 711                 # Process destination ports.
 712                 my $use_dst_ports  = ($$hash{$key}[11] eq "ON");
 713                 my $use_dnat       = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat"));
 714
 715                 if ($use_dst_ports) {
 716                         my $dst_ports_mode = $$hash{$key}[14];
 717                         my $dst_ports      = $$hash{$key}[15];
 718
 719                         if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) {
 720                                 if ($nat_options_wanted && $use_dnat && $$hash{$key}[30]) {
 721                                         $dst_ports = $$hash{$key}[30];
 722                                 }
 723                                 push(@options, &format_ports($dst_ports, "dst"));
 724
 725                         } elsif ($dst_ports_mode eq "cust_srv") {
 726                                 if ($protocol eq "ICMP") {
 727                                         push(@options, ("--icmp-type", &fwlib::get_srv_port($dst_ports, 3, "ICMP")));
 728                                 } else {
 729                                         $dst_ports = &fwlib::get_srv_port($dst_ports, 1, uc($protocol));
 730                                         push(@options, &format_ports($dst_ports, "dst"));
 731                                 }
 732
 733                         } elsif ($dst_ports_mode eq "cust_srvgrp") {
 734                                 push(@options, &fwlib::get_srvgrp_port($dst_ports, uc($protocol)));
 735                         }
 736                 }
 737         }
 738
 739         # Check if a single ICMP type is selected.
 740         if ($protocol eq "icmp") {
 741                 my $icmp_type = $$hash{$key}[9];
 742
 743                 if (($icmp_type ne "All ICMP-Types") && $icmp_type) {
 744                         push(@options, ("--icmp-type", $icmp_type));
 745                 }
 746         }
 747
 748         return @options;
 749 }
 750
 751 sub format_ports {
 752         my $ports = shift;
 753         my $type = shift;
 754
 755         my $arg;
 756         if ($type eq "src") {
 757                 $arg = "--sport";
 758         } elsif ($type eq "dst") {
 759                 $arg = "--dport";
 760         }
 761
 762         my @options = ();
 763
 764         if ($ports =~ /\|/) {
 765                 $ports =~ s/\|/,/g;
 766                 push(@options, ("-m", "multiport"));
 767         }
 768
 769         if ($ports) {
 770                 push(@options, ($arg, $ports));
 771         }
 772
 773         return @options;
 774 }
 775
 776 sub get_dnat_target_port {
 777         my $hash = shift;
 778         my $key  = shift;
 779
 780         if ($$hash{$key}[14] eq "TGT_PORT") {
 781                 my $port = $$hash{$key}[15];
 782                 my $external_port = $$hash{$key}[30];
 783
 784                 if ($external_port && ($port ne $external_port)) {
 785                         return $$hash{$key}[15];
 786                 }
 787         }
 788 }
 789
 790 sub add_dnat_mangle_rules {
 791         my $nat_address = shift;
 792         my $interface = shift;
 793         my @options = @_;
 794
 795         my $mark = 0;
 796         foreach my $zone ("GREEN", "BLUE", "ORANGE") {
 797                 $mark++;
 798
 799                 # Skip rule if not all required information exists.
 800                 next unless (exists $defaultNetworks{$zone . "_NETADDRESS"});
 801                 next unless (exists $defaultNetworks{$zone . "_NETMASK"});
 802
 803                 next if ($interface && $interface ne $defaultNetworks{$zone . "_DEV"});
 804
 805                 my @mangle_options = @options;
 806
 807                 my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"};
 808                 $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"};
 809
 810                 push(@mangle_options, ("-s", $netaddress, "-d", $nat_address));
 811                 push(@mangle_options, ("-j", "MARK", "--set-mark", $mark));
 812
 813                 run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options");
 814         }
 815 }
 816
 817 sub make_log_limit_options {
 818         my @options = ("-m", "limit");
 819
 820         # Maybe we should get this from the configuration.
 821         my $limit = 10;
 822
 823         # We limit log messages to $limit messages per second.
 824         push(@options, ("--limit", "$limit/second"));
 825
 826         # And we allow bursts of 2x $limit.
 827         push(@options, ("--limit-burst", $limit * 2));
 828
 829         return @options;
 830 }
 831
 832 sub firewall_is_in_subnet {
 833         my $subnet = shift;
 834
 835         # ORANGE is missing here, because nothing may ever access
 836         # the firewall from this network.
 837         my $address = &fwlib::get_internal_firewall_ip_address($subnet, 0);
 838
 839         if ($address) {
 840                 return 1;
 841         }
 842
 843         return 0;
 844 }