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