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 "${General::swroot}/lang.pl";
  27 require "${General::swroot}/geoip-functions.pl";
  28 require "/usr/lib/firewall/firewall-lib.pl";
  29
  30 # Set to one to enable debugging mode.
  31 my $DEBUG = 0;
  32
  33 my $IPTABLES = "iptables --wait";
  34
  35 # iptables chains
  36 my $CHAIN_INPUT           = "INPUTFW";
  37 my $CHAIN_FORWARD         = "FORWARDFW";
  38 my $CHAIN_OUTPUT          = "OUTGOINGFW";
  39 my $CHAIN                 = $CHAIN_FORWARD;
  40 my $CHAIN_NAT_SOURCE      = "NAT_SOURCE";
  41 my $CHAIN_NAT_DESTINATION = "NAT_DESTINATION";
  42 my $CHAIN_MANGLE_NAT_DESTINATION_FIX = "NAT_DESTINATION";
  43 my @VALID_CHAINS          = ($CHAIN_INPUT, $CHAIN_FORWARD, $CHAIN_OUTPUT);
  44 my @ANY_ADDRESSES         = ("0.0.0.0/0.0.0.0", "0.0.0.0/0", "0/0");
  45
  46 my @PROTOCOLS = ("tcp", "udp", "icmp", "igmp", "ah", "esp", "gre", "ipv6", "ipip");
  47 my @PROTOCOLS_WITH_PORTS = ("tcp", "udp");
  48
  49 my @VALID_TARGETS = ("ACCEPT", "DROP", "REJECT");
  50
  51 my %fwdfwsettings=();
  52 my %fwoptions = ();
  53 my %defaultNetworks=();
  54 my %configfwdfw=();;
  55 my %customgrp=();
  56 my %configinputfw=();
  57 my %configoutgoingfw=();
  58 my %confignatfw=();
  59 my %geoipsettings = (
  60         "GEOIPBLOCK_ENABLED" => "off"
  61 );
  62
  63 my @p2ps=();
  64
  65 my $configfwdfw         = "${General::swroot}/firewall/config";
  66 my $configinput     = "${General::swroot}/firewall/input";
  67 my $configoutgoing  = "${General::swroot}/firewall/outgoing";
  68 my $p2pfile                     = "${General::swroot}/firewall/p2protocols";
  69 my $geoipfile           = "${General::swroot}/firewall/geoipblock";
  70 my $configgrp           = "${General::swroot}/fwhosts/customgroups";
  71 my $netsettings         = "${General::swroot}/ethernet/settings";
  72
  73 &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings);
  74 &General::readhash("${General::swroot}/optionsfw/settings", \%fwoptions);
  75 &General::readhash("$netsettings", \%defaultNetworks);
  76 &General::readhasharray($configfwdfw, \%configfwdfw);
  77 &General::readhasharray($configinput, \%configinputfw);
  78 &General::readhasharray($configoutgoing, \%configoutgoingfw);
  79 &General::readhasharray($configgrp, \%customgrp);
  80
  81 # Check if the geoip settings file exists
  82 if (-e "$geoipfile") {
  83         # Read settings file
  84         &General::readhash("$geoipfile", \%geoipsettings);
  85 }
  86
  87 # Get all GeoIP locations.
  88 my @locations = &fwlib::get_geoip_locations();
  89
  90 my @log_limit_options = &make_log_limit_options();
  91
  92 my $POLICY_INPUT_ALLOWED   = 0;
  93 my $POLICY_FORWARD_ALLOWED = ($fwdfwsettings{"POLICY"} eq "MODE2");
  94 my $POLICY_OUTPUT_ALLOWED  = ($fwdfwsettings{"POLICY1"} eq "MODE2");
  95
  96 my $POLICY_INPUT_ACTION    = $fwoptions{"FWPOLICY2"};
  97 my $POLICY_FORWARD_ACTION  = $fwoptions{"FWPOLICY"};
  98 my $POLICY_OUTPUT_ACTION   = $fwoptions{"FWPOLICY1"};
  99
 100 # MAIN
 101 &main();
 102
 103 sub main {
 104         # Gather locations which should be exported.
 105         my @locations_to_export = &gather_locations_to_export();
 106
 107         # Flush all chains.
 108         &flush();
 109
 110         # Flush exported locations.
 111         &GeoIP::flush_exported_locations();
 112
 113         # Export required locations.
 114         &GeoIP::export_locations(\@locations_to_export);
 115
 116         # Prepare firewall rules.
 117         if (! -z  "${General::swroot}/firewall/input"){
 118                 &buildrules(\%configinputfw);
 119         }
 120         if (! -z  "${General::swroot}/firewall/outgoing"){
 121                 &buildrules(\%configoutgoingfw);
 122         }
 123         if (! -z  "${General::swroot}/firewall/config"){
 124                 &buildrules(\%configfwdfw);
 125         }
 126
 127         # Load P2P block rules.
 128         &p2pblock();
 129
 130         # Load GeoIP block rules.
 131         &geoipblock();
 132
 133         # Reload firewall policy.
 134         run("/usr/sbin/firewall-policy");
 135
 136         #Reload firewall.local if present
 137         if ( -f '/etc/sysconfig/firewall.local'){
 138                 run("/etc/sysconfig/firewall.local reload");
 139         }
 140 }
 141
 142 sub run {
 143         # Executes or prints the given shell command.
 144         my $command = shift;
 145
 146         if ($DEBUG) {
 147                 print "$command\n";
 148         } else {
 149                 system "$command";
 150
 151                 if ($?) {
 152                         print_error("ERROR: $command");
 153                 }
 154         }
 155 }
 156
 157 sub print_error {
 158         my $message = shift;
 159
 160         print STDERR "$message\n";
 161 }
 162
 163 sub print_rule {
 164         my $hash = shift;
 165
 166         print "\nRULE:";
 167
 168         my $i = 0;
 169         foreach (@$hash) {
 170                 printf("  %2d: %s", $i++, $_);
 171         }
 172         print "\n";
 173 }
 174
 175 sub count_elements {
 176         my $hash = shift;
 177
 178         return scalar @$hash;
 179 }
 180
 181 sub flush {
 182         run("$IPTABLES -F $CHAIN_INPUT");
 183         run("$IPTABLES -F $CHAIN_FORWARD");
 184         run("$IPTABLES -F $CHAIN_OUTPUT");
 185         run("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE");
 186         run("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION");
 187         run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX");
 188 }
 189
 190 sub buildrules {
 191         my $hash = shift;
 192
 193         # Search for targets that need to be specially handled when adding
 194         # forwarding rules. Additional rules will automatically get inserted
 195         # into the INPUT/OUTPUT chains for these targets.
 196         my @special_input_targets = ();
 197         if (!$POLICY_FORWARD_ALLOWED) {
 198                 push(@special_input_targets, "ACCEPT");
 199         }
 200
 201         if ($POLICY_INPUT_ACTION eq "DROP") {
 202                 push(@special_input_targets, ("ACCEPT", "REJECT"));
 203         } elsif ($POLICY_INPUT_ACTION eq "REJECT") {
 204                 push(@special_input_targets, ("ACCEPT", "DROP"));
 205         }
 206
 207         my @special_output_targets = ();
 208         if ($POLICY_OUTPUT_ALLOWED) {
 209                 push(@special_output_targets, ("DROP", "REJECT"));
 210         } else {
 211                 push(@special_output_targets, "ACCEPT");
 212
 213                 if ($POLICY_OUTPUT_ACTION eq "DROP") {
 214                         push(@special_output_targets, ("ACCEPT", "REJECT"));
 215                 } elsif ($POLICY_OUTPUT_ACTION eq "REJECT") {
 216                         push(@special_output_targets, ("ACCEPT", "DROP"));
 217                 }
 218         }
 219
 220         foreach my $key (sort {$a <=> $b} keys %$hash) {
 221                 # Skip disabled rules.
 222                 next unless ($$hash{$key}[2] eq 'ON');
 223
 224                 # Count number of elements in this line
 225                 my $elements = &count_elements($$hash{$key});
 226
 227                 if ($DEBUG) {
 228                         print_rule($$hash{$key});
 229                 }
 230
 231                 # Check if the target is valid.
 232                 my $target = $$hash{$key}[0];
 233                 if (!$target ~~ @VALID_TARGETS) {
 234                         print_error("Invalid target '$target' for rule $key");
 235                         next;
 236                 }
 237
 238                 # Check if the chain is valid.
 239                 my $chain = $$hash{$key}[1];
 240                 if (!$chain ~~ @VALID_CHAINS) {
 241                         print_error("Invalid chain '$chain' in rule $key");
 242                         next;
 243                 }
 244
 245                 # Collect all sources.
 246                 my @sources = &fwlib::get_addresses($hash, $key, "src");
 247
 248                 # Collect all destinations.
 249                 my @destinations = &fwlib::get_addresses($hash, $key, "tgt");
 250
 251                 # True if the destination is the firewall itself.
 252                 my $destination_is_firewall = ($$hash{$key}[5] eq "ipfire");
 253
 254                 # Check if logging should be enabled.
 255                 my $LOG = ($$hash{$key}[17] eq 'ON');
 256
 257                 # Check if NAT is enabled and initialize variables, that we use for that.
 258                 my $NAT = ($$hash{$key}[28] eq 'ON');
 259                 my $NAT_MODE;
 260                 if ($NAT) {
 261                         $NAT_MODE = uc($$hash{$key}[31]);
 262                 }
 263
 264                 # Set up time constraints.
 265                 my @time_options = ();
 266                 if ($$hash{$key}[18] eq 'ON') {
 267                         push(@time_options, ("-m", "time"));
 268
 269                         # Select all days of the week this match is active.
 270                         my @weekdays = ();
 271                         if ($$hash{$key}[19] ne '') {
 272                                 push (@weekdays, "Mon");
 273                         }
 274                         if ($$hash{$key}[20] ne '') {
 275                                 push (@weekdays, "Tue");
 276                         }
 277                         if ($$hash{$key}[21] ne '') {
 278                                 push (@weekdays, "Wed");
 279                         }
 280                         if ($$hash{$key}[22] ne '') {
 281                                 push (@weekdays, "Thu");
 282                         }
 283                         if ($$hash{$key}[23] ne '') {
 284                                 push (@weekdays, "Fri");
 285                         }
 286                         if ($$hash{$key}[24] ne '') {
 287                                 push (@weekdays, "Sat");
 288                         }
 289                         if ($$hash{$key}[25] ne '') {
 290                                 push (@weekdays, "Sun");
 291                         }
 292                         if (@weekdays) {
 293                                 push(@time_options, ("--weekdays", join(",", @weekdays)));
 294                         }
 295
 296                         # Convert start time.
 297                         my $time_start = &format_time($$hash{$key}[26]);
 298                         if ($time_start) {
 299                                 push(@time_options, ("--timestart", $time_start));
 300                         }
 301
 302                         # Convert end time.
 303                         my $time_stop = &format_time($$hash{$key}[27]);
 304                         if ($time_stop) {
 305                                 push(@time_options, ("--timestop", $time_stop));
 306                         }
 307                 }
 308
 309                 # Concurrent connection limit
 310                 my @ratelimit_options = ();
 311
 312                 if (($elements ge 34) && ($$hash{$key}[32] eq 'ON')) {
 313                         my $conn_limit = $$hash{$key}[33];
 314
 315                         if ($conn_limit ge 1) {
 316                                 push(@ratelimit_options, ("-m", "connlimit"));
 317
 318                                 # Use the the entire source IP address
 319                                 push(@ratelimit_options, "--connlimit-saddr");
 320                                 push(@ratelimit_options, ("--connlimit-mask", "32"));
 321
 322                                 # Apply the limit
 323                                 push(@ratelimit_options, ("--connlimit-upto", $conn_limit));
 324                         }
 325                 }
 326
 327                 # Ratelimit
 328                 if (($elements ge 37) && ($$hash{$key}[34] eq 'ON')) {
 329                         my $rate_limit = "$$hash{$key}[35]/$$hash{$key}[36]";
 330
 331                         if ($rate_limit) {
 332                                 push(@ratelimit_options, ("-m", "limit"));
 333                                 push(@ratelimit_options, ("--limit", $rate_limit));
 334                         }
 335                 }
 336
 337                 # Check which protocols are used in this rule and so that we can
 338                 # later group rules by protocols.
 339                 my @protocols = &get_protocols($hash, $key);
 340                 if (!@protocols) {
 341                         print_error("Invalid protocol configuration for rule $key");
 342                         next;
 343                 }
 344
 345                 foreach my $protocol (@protocols) {
 346                         # Check if the given protocol is supported.
 347                         if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) {
 348                                 print_error("Protocol $protocol is not supported (rule $key)");
 349                                 next;
 350                         }
 351
 352                         # Prepare protocol options (like ICMP types, ports, etc...).
 353                         my @protocol_options = &get_protocol_options($hash, $key, $protocol, 0);
 354
 355                         # Check if this protocol knows ports.
 356                         my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS);
 357
 358                         foreach my $src (@sources) {
 359                                 # Skip invalid source.
 360                                 next unless (defined $src);
 361                                 next unless ($src);
 362
 363                                 # Sanitize source.
 364                                 my $source = @$src[0];
 365                                 if ($source ~~ @ANY_ADDRESSES) {
 366                                         $source = "";
 367                                 }
 368
 369                                 my $source_intf = @$src[1];
 370
 371                                 foreach my $dst (@destinations) {
 372                                         # Skip invalid rules.
 373                                         next unless (defined $dst);
 374                                         next if (!$dst || ($dst eq "none"));
 375
 376                                         # Sanitize destination.
 377                                         my $destination = @$dst[0];
 378                                         if ($destination ~~ @ANY_ADDRESSES) {
 379                                                 $destination = "";
 380                                         }
 381
 382                                         my $destination_intf = @$dst[1];
 383
 384                                         # Array with iptables arguments.
 385                                         my @options = ();
 386
 387                                         # Append protocol.
 388                                         if ($protocol ne "all") {
 389                                                 push(@options, @protocol_options);
 390                                         }
 391
 392                                         # Prepare source options.
 393                                         my @source_options = ();
 394                                         if ($source =~ /mac/) {
 395                                                 push(@source_options, $source);
 396                                         } elsif ($source =~ /-m geoip/) {
 397                                                 push(@source_options, $source);
 398                                         } elsif($source) {
 399                                                 push(@source_options, ("-s", $source));
 400                                         }
 401
 402                                         # Prepare destination options.
 403                                         my @destination_options = ();
 404                                         if ($destination =~ /-m geoip/) {
 405                                                 push(@destination_options,  $destination);
 406                                         } elsif ($destination) {
 407                                                 push(@destination_options, ("-d", $destination));
 408                                         }
 409
 410                                         # Add source and destination interface to the filter rules.
 411                                         # These are supposed to help filtering forged packets that originate
 412                                         # from BLUE with an IP address from GREEN for instance.
 413                                         my @source_intf_options = ();
 414                                         if ($source_intf) {
 415                                                 push(@source_intf_options, ("-i", $source_intf));
 416                                         }
 417
 418                                         my @destination_intf_options = ();
 419                                         if ($destination_intf) {
 420                                                 push(@destination_intf_options, ("-o", $destination_intf));
 421                                         }
 422
 423                                         # Add time constraint options.
 424                                         push(@options, @time_options);
 425
 426                                         # Add ratelimiting option
 427                                         push(@options, @ratelimit_options);
 428
 429                                         my $firewall_is_in_source_subnet = 1;
 430                                         if ($source) {
 431                                                 $firewall_is_in_source_subnet = &firewall_is_in_subnet($source);
 432                                         }
 433
 434                                         my $firewall_is_in_destination_subnet = 1;
 435                                         if ($destination) {
 436                                                 $firewall_is_in_destination_subnet = &firewall_is_in_subnet($destination);
 437                                         }
 438
 439                                         # Process NAT rules.
 440                                         if ($NAT) {
 441                                                 my $nat_address = &fwlib::get_nat_address($$hash{$key}[29], $source);
 442
 443                                                 # Skip NAT rules if the NAT address is unknown
 444                                                 # (i.e. no internet connection has been established, yet).
 445                                                 next unless ($nat_address);
 446
 447                                                 # Destination NAT
 448                                                 if ($NAT_MODE eq "DNAT") {
 449                                                         my @nat_options = ();
 450                                                         if ($protocol ne "all") {
 451                                                                 my @nat_protocol_options = &get_protocol_options($hash, $key, $protocol, 1);
 452                                                                 push(@nat_options, @nat_protocol_options);
 453                                                         }
 454                                                         push(@nat_options, @time_options);
 455
 456                                                         # Make port-forwardings useable from the internal networks.
 457                                                         my @internal_addresses = &fwlib::get_internal_firewall_ip_addresses(1);
 458                                                         unless ($nat_address ~~ @internal_addresses) {
 459                                                                 &add_dnat_mangle_rules($nat_address, $source_intf, @nat_options);
 460                                                         }
 461
 462                                                         push(@nat_options, @source_options);
 463                                                         push(@nat_options, ("-d", $nat_address));
 464
 465                                                         my $dnat_port;
 466                                                         if ($protocol_has_ports) {
 467                                                                 $dnat_port = &get_dnat_target_port($hash, $key);
 468                                                         }
 469
 470                                                         my @nat_action_options = ();
 471
 472                                                         # Use iptables REDIRECT
 473                                                         my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports && $dnat_port);
 474                                                         if ($use_redirect) {
 475                                                                 push(@nat_action_options, ("-j", "REDIRECT", "--to-ports", $dnat_port));
 476
 477                                                         # Use iptables DNAT
 478                                                         } else {
 479                                                                 if ($destination_is_firewall && !$destination) {
 480                                                                         $destination = &fwlib::get_external_address();
 481                                                                 }
 482                                                                 next unless ($destination);
 483
 484                                                                 my ($dnat_address, $dnat_mask) = split("/", $destination);
 485                                                                 @destination_options = ("-d", $dnat_address);
 486
 487                                                                 if ($protocol_has_ports) {
 488                                                                         my $dnat_port = &get_dnat_target_port($hash, $key);
 489
 490                                                                         if ($dnat_port) {
 491                                                                                 $dnat_address .= ":$dnat_port";
 492                                                                         }
 493                                                                 }
 494
 495                                                                 push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address));
 496                                                         }
 497
 498                                                         if ($LOG) {
 499                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '");
 500                                                         }
 501                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options");
 502
 503                                                 # Source NAT
 504                                                 } elsif ($NAT_MODE eq "SNAT") {
 505                                                         my @snat_options = ( "-m", "policy", "--dir", "out", "--pol", "none" );
 506                                                         my @nat_options = @options;
 507
 508                                                         # Get addresses for the configured firewall interfaces.
 509                                                         my @local_addresses = &fwlib::get_internal_firewall_ip_addresses(1);
 510
 511                                                         # Check if the nat_address is one of the local addresses.
 512                                                         foreach my $local_address (@local_addresses) {
 513                                                                 if ($nat_address eq $local_address) {
 514                                                                         # Clear SNAT options.
 515                                                                         @snat_options = ();
 516
 517                                                                         # Finish loop.
 518                                                                         last;
 519                                                                 }
 520                                                         }
 521
 522                                                         push(@nat_options, @destination_intf_options);
 523                                                         push(@nat_options, @source_options);
 524                                                         push(@nat_options, @destination_options);
 525
 526                                                         if ($LOG) {
 527                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options @log_limit_options -j LOG --log-prefix 'SNAT '");
 528                                                         }
 529                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options -j SNAT --to-source $nat_address");
 530                                                 }
 531                                         }
 532
 533                                         push(@options, @source_options);
 534                                         push(@options, @destination_options);
 535
 536                                         # Insert firewall rule.
 537                                         if ($LOG) {
 538                                                 run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options @log_limit_options -j LOG --log-prefix '$chain '");
 539                                         }
 540                                         run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options -j $target");
 541
 542                                         # Handle forwarding rules and add corresponding rules for firewall access.
 543                                         if ($chain eq $CHAIN_FORWARD) {
 544                                                 # If the firewall is part of the destination subnet and access to the destination network
 545                                                 # is granted/forbidden for any network that the firewall itself is part of, we grant/forbid access
 546                                                 # for the firewall, too.
 547                                                 if ($firewall_is_in_destination_subnet && ($target ~~ @special_input_targets)) {
 548                                                         if ($LOG) {
 549                                                                 run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '");
 550                                                         }
 551                                                         run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options -j $target");
 552                                                 }
 553
 554                                                 # Likewise.
 555                                                 if ($firewall_is_in_source_subnet && ($target ~~ @special_output_targets)) {
 556                                                         if ($LOG) {
 557                                                                 run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_OUTPUT '");
 558                                                         }
 559                                                         run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options -j $target");
 560                                                 }
 561                                         }
 562                                 }
 563                         }
 564                 }
 565         }
 566 }
 567
 568 # Formats the given timestamp into the iptables format which is "hh:mm" UTC.
 569 sub format_time {
 570         my $val = shift;
 571
 572         # Convert the given time into minutes.
 573         my $minutes = &time_convert_to_minutes($val);
 574
 575         # Move the timestamp into UTC.
 576         $minutes += &time_utc_offset();
 577
 578         # Make sure $minutes is between 00:00 and 23:59.
 579         if ($minutes < 0) {
 580                 $minutes += 1440;
 581         }
 582
 583         if ($minutes > 1440) {
 584                 $minutes -= 1440;
 585         }
 586
 587         # Format as hh:mm.
 588         return sprintf("%02d:%02d", $minutes / 60, $minutes % 60);
 589 }
 590
 591 # Calculates the offsets in minutes from the local timezone to UTC.
 592 sub time_utc_offset {
 593         my @localtime = localtime(time);
 594         my @gmtime = gmtime(time);
 595
 596         return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60);
 597 }
 598
 599 # Takes a timestamp like "14:00" and converts it into minutes since midnight.
 600 sub time_convert_to_minutes {
 601         my ($hrs, $min) = split(":", shift);
 602
 603         return ($hrs * 60) + $min;
 604 }
 605
 606 sub p2pblock {
 607         open(FILE, "<$p2pfile") or die "Unable to read $p2pfile";
 608         my @protocols = ();
 609         foreach my $p2pentry (<FILE>) {
 610                 my @p2pline = split(/\;/, $p2pentry);
 611                 next unless ($p2pline[2] eq "off");
 612
 613                 push(@protocols, "--$p2pline[1]");
 614         }
 615         close(FILE);
 616
 617         run("$IPTABLES -F P2PBLOCK");
 618         if (@protocols) {
 619                 run("$IPTABLES -A P2PBLOCK -m ipp2p @protocols -j DROP");
 620         }
 621 }
 622
 623 sub geoipblock {
 624         # Flush iptables chain.
 625         run("$IPTABLES -F GEOIPBLOCK");
 626
 627         # If geoip blocking is not enabled, we are finished here.
 628         if ($geoipsettings{'GEOIPBLOCK_ENABLED'} ne "on") {
 629                 # Exit submodule. Process remaining script.
 630                 return;
 631         }
 632
 633         # Loop through all supported geoip locations and
 634         # create iptables rules, if blocking this country
 635         # is enabled.
 636         foreach my $location (@locations) {
 637                 if(exists $geoipsettings{$location} && $geoipsettings{$location} eq "on") {
 638                         run("$IPTABLES -A GEOIPBLOCK -m geoip --src-cc $location -j DROP");
 639                 }
 640         }
 641 }
 642
 643 sub get_protocols {
 644         my $hash = shift;
 645         my $key = shift;
 646
 647         my $uses_source_ports = ($$hash{$key}[7] eq "ON");
 648         my $uses_services = ($$hash{$key}[11] eq "ON");
 649
 650         my @protocols = ();
 651
 652         # Rules which don't have source ports or services (like ICMP, ESP, ...).
 653         if (!$uses_source_ports && !$uses_services) {
 654                 push(@protocols, $$hash{$key}[8]);
 655
 656         # Rules which either use ports or services.
 657         } elsif ($uses_source_ports || $uses_services) {
 658                 # Check if service group or service
 659                 if ($$hash{$key}[14] eq 'cust_srv') {
 660                         push(@protocols, &fwlib::get_srv_prot($$hash{$key}[15]));
 661
 662                 } elsif($$hash{$key}[14] eq 'cust_srvgrp'){
 663                         my $protos = &fwlib::get_srvgrp_prot($$hash{$key}[15]);
 664                         push(@protocols, split(",", $protos));
 665
 666                 } else {
 667                         # Fetch the protocol for this rule.
 668                         my $protocol = lc($$hash{$key}[8]);
 669
 670                         # Fetch source and destination ports for this rule.
 671                         my $source_ports = $$hash{$key}[10];
 672                         my $destination_ports = $$hash{$key}[15];
 673
 674                         # Check if ports are set for protocols which do not support ports.
 675                         if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) {
 676                                 print_error("$protocol does not support ports");
 677                                 return ();
 678                         }
 679
 680                         push(@protocols, $protocol);
 681                 }
 682         }
 683
 684         # Remove all empty elements
 685         @protocols = map { $_ ? $_ : () } @protocols;
 686
 687         # If no protocol has been defined, we assume "all".
 688         if (!@protocols) {
 689                 push(@protocols, "all");
 690         }
 691
 692         # Make all protocol names lowercase.
 693         @protocols = map { lc } @protocols;
 694
 695         return @protocols;
 696 }
 697
 698 sub get_protocol_options {
 699         my $hash = shift;
 700         my $key  = shift;
 701         my $protocol = shift;
 702         my $nat_options_wanted = shift;
 703         my @options = ();
 704
 705         # Nothing to do if no protocol is specified.
 706         if ($protocol eq "all") {
 707                 return @options;
 708         } else {
 709                 push(@options, ("-p", $protocol));
 710         }
 711
 712         if ($protocol ~~ @PROTOCOLS_WITH_PORTS) {
 713                 # Process source ports.
 714                 my $use_src_ports = ($$hash{$key}[7] eq "ON");
 715                 my $src_ports     = $$hash{$key}[10];
 716
 717                 if ($use_src_ports && $src_ports) {
 718                         push(@options, &format_ports($src_ports, "src"));
 719                 }
 720
 721                 # Process destination ports.
 722                 my $use_dst_ports  = ($$hash{$key}[11] eq "ON");
 723                 my $use_dnat       = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat"));
 724
 725                 if ($use_dst_ports) {
 726                         my $dst_ports_mode = $$hash{$key}[14];
 727                         my $dst_ports      = $$hash{$key}[15];
 728
 729                         if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) {
 730                                 if ($nat_options_wanted && $use_dnat && $$hash{$key}[30]) {
 731                                         $dst_ports = $$hash{$key}[30];
 732                                 }
 733                                 push(@options, &format_ports($dst_ports, "dst"));
 734
 735                         } elsif ($dst_ports_mode eq "cust_srv") {
 736                                 if ($protocol eq "ICMP") {
 737                                         push(@options, ("--icmp-type", &fwlib::get_srv_port($dst_ports, 3, "ICMP")));
 738                                 } else {
 739                                         $dst_ports = &fwlib::get_srv_port($dst_ports, 1, uc($protocol));
 740                                         push(@options, &format_ports($dst_ports, "dst"));
 741                                 }
 742
 743                         } elsif ($dst_ports_mode eq "cust_srvgrp") {
 744                                 push(@options, &fwlib::get_srvgrp_port($dst_ports, uc($protocol)));
 745                         }
 746                 }
 747         }
 748
 749         # Check if a single ICMP type is selected.
 750         if ($protocol eq "icmp") {
 751                 my $icmp_type = $$hash{$key}[9];
 752
 753                 if (($icmp_type ne "All ICMP-Types") && $icmp_type) {
 754                         push(@options, ("--icmp-type", $icmp_type));
 755                 }
 756         }
 757
 758         return @options;
 759 }
 760
 761 sub format_ports {
 762         my $ports = shift;
 763         my $type = shift;
 764
 765         my $arg;
 766         if ($type eq "src") {
 767                 $arg = "--sport";
 768         } elsif ($type eq "dst") {
 769                 $arg = "--dport";
 770         }
 771
 772         my @options = ();
 773
 774         if ($ports =~ /\|/) {
 775                 $ports =~ s/\|/,/g;
 776                 push(@options, ("-m", "multiport"));
 777         }
 778
 779         if ($ports) {
 780                 push(@options, ($arg, $ports));
 781         }
 782
 783         return @options;
 784 }
 785
 786 sub get_dnat_target_port {
 787         my $hash = shift;
 788         my $key  = shift;
 789
 790         if ($$hash{$key}[14] eq "TGT_PORT") {
 791                 my $port = $$hash{$key}[15];
 792                 my $external_port = $$hash{$key}[30];
 793
 794                 if ($external_port && ($port ne $external_port)) {
 795                         return $$hash{$key}[15];
 796                 }
 797         }
 798 }
 799
 800 sub add_dnat_mangle_rules {
 801         my $nat_address = shift;
 802         my $interface = shift;
 803         my @options = @_;
 804
 805         my $mark = 0;
 806         foreach my $zone ("GREEN", "BLUE", "ORANGE") {
 807                 $mark++;
 808
 809                 # Skip rule if not all required information exists.
 810                 next unless (exists $defaultNetworks{$zone . "_NETADDRESS"});
 811                 next unless (exists $defaultNetworks{$zone . "_NETMASK"});
 812
 813                 next if ($interface && $interface ne $defaultNetworks{$zone . "_DEV"});
 814
 815                 my @mangle_options = @options;
 816
 817                 my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"};
 818                 $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"};
 819
 820                 push(@mangle_options, ("-s", $netaddress, "-d", $nat_address));
 821                 push(@mangle_options, ("-j", "MARK", "--set-mark", $mark));
 822
 823                 run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options");
 824         }
 825 }
 826
 827 sub make_log_limit_options {
 828         my @options = ("-m", "limit");
 829
 830         # Maybe we should get this from the configuration.
 831         my $limit = 10;
 832
 833         # We limit log messages to $limit messages per second.
 834         push(@options, ("--limit", "$limit/second"));
 835
 836         # And we allow bursts of 2x $limit.
 837         push(@options, ("--limit-burst", $limit * 2));
 838
 839         return @options;
 840 }
 841
 842 sub firewall_is_in_subnet {
 843         my $subnet = shift;
 844
 845         # ORANGE is missing here, because nothing may ever access
 846         # the firewall from this network.
 847         my $address = &fwlib::get_internal_firewall_ip_address($subnet, 0);
 848
 849         if ($address) {
 850                 return 1;
 851         }
 852
 853         return 0;
 854 }
 855
 856 #
 857 # Function to gather which locations needs to be exported.
 858 #
 859 sub gather_locations_to_export () {
 860         my %geoipblock_exports = ();
 861
 862         # Array to store the final list of locations.
 863         my @export_locations;
 864
 865         # Array to temporary store all used GeoIP groups.
 866         my @used_GeoIP_groups;
 867
 868         # Check if GeoIP-block is enabled.
 869         if($geoipsettings{"GEOIPBLOCK_ENABLED"} eq "on") {
 870                 # Loop through the array of supported locations.
 871                 foreach my $location (@locations) {
 872                         if ($geoipsettings{$location} eq "on") {
 873                                 $geoipblock_exports{$location} = "1";
 874                         }
 875                 }
 876         }
 877
 878         # Get the firewall locations of the input, forward and output
 879         # firewall settings hashhes.
 880         my %input_exports = &_grab_geoip_locations_from_fw_settings_hash(\%configinputfw);
 881         my %forward_exports = &_grab_geoip_locations_from_fw_settings_hash(\%configfwdfw);
 882         my %output_exports = &_grab_geoip_locations_from_fw_settings_hash(\%configoutgoingfw);
 883
 884         # Merge the hashes.
 885         #
 886         # If a location is part of multiple hashes, it results in only one entry in the final hash.
 887         my %export_locations = ( %geoipblock_exports, %input_exports, %forward_exports, %output_exports );
 888
 889         # Loop through the hash of exported locations.
 890         foreach my $location (keys %export_locations) {
 891                 # Convert location into upper-case format.
 892                 my $location_uc = uc($location);
 893
 894                 # Add the location to the array.
 895                 push(@export_locations, $location_uc);
 896         }
 897
 898         # Return the array.
 899         return @export_locations;
 900 }
 901
 902 #
 903 # Function to gather the GeoIP locations from a given hash
 904 # containing the firewall settings.
 905 #
 906 sub _grab_geoip_locations_from_fw_settings_hash (\%) {
 907         my $hash = shift;
 908         my %exports;
 909
 910         # Loop through the given firewall config hash.
 911         foreach my $rule ( keys %$hash ) {
 912                 # Skip if the rule is disabled.
 913                 next unless($$hash{$rule}[2] eq "ON");
 914
 915                 # Process rules with GeoIP as source.
 916                 if($$hash{$rule}[3] eq "cust_geoip_src") {
 917                         my $source = $$hash{$rule}[4];
 918
 919                         # Check if the source is a group.
 920                         if($source =~ m/group/) {
 921                                my($group, $groupname) = split(":", $source);
 922
 923                                 # Get locations which are part of the group.
 924                                 my @group_locations = &_grab_geoip_locations_from_group($groupname);
 925
 926                                 # Loop through the array.
 927                                 foreach my $location (@group_locations) {
 928                                         # Add location to the exports hash.
 929                                         $exports{$location} = "1";
 930                                 }
 931                         } else {
 932                                 # Add location to the exports hash.
 933                                 $exports{$source} = "1";
 934                         }
 935
 936                         # Jump the next rule.
 937                         next;
 938                 }
 939
 940                 # Process rules with GeoIP as target.
 941                 if($$hash{$rule}[5] eq "cust_geoip_tgt") {
 942                         my $destination = $$hash{$rule}[6];
 943
 944                         # Check if the destination is a group.
 945                         if($destination =~ m/group/) {
 946                                 my($group, $groupname) = split(":", $destination);
 947
 948                                 # Get locations which are part of the group.
 949                                 my @group_locations = &_grab_geoip_locations_from_group($groupname);
 950
 951                                 # Loop through the array.
 952                                 foreach my $location (@group_locations) {
 953                                         # Add location to the exports hash.
 954                                         $exports{$location} = "1";
 955                                 }
 956                         } else {
 957                                 # Add location to the exports hash.
 958                                 $exports{$destination} = "1";
 959                         }
 960
 961                         # Jump to next rule.
 962                         next;
 963                 }
 964         }
 965
 966         # Return the array.
 967         return %exports;
 968 }
 969
 970 #
 971 # Function to gather the GeoIP locations from a given group name.
 972 #
 973 sub _grab_geoip_locations_from_group($) {
 974         my ($groupname) = @_;
 975
 976         my %geoipgroups = ();
 977         my @group_locations;
 978
 979         # Get all configured GeoIP related groups.
 980         &General::readhasharray("${General::swroot}/fwhosts/customgeoipgrp", \%geoipgroups);
 981
 982         # Loop through the hash of GeoIP groups.
 983         foreach my $key (keys %geoipgroups) {
 984                 # Seach for members of the given group.
 985                 if($geoipgroups{$key}[0] eq "$groupname") {
 986                         # Add the location to the group_locations array.
 987                         push(@group_locations, $geoipgroups{$key}[2]);
 988                 }
 989         }
 990
 991         # Return the array.
 992         return @group_locations;
 993 }