config/firewall/rules.pl

   1 #!/usr/bin/perl -w
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2007-2020  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 "${General::swroot}/lang.pl";
  27 require "/usr/lib/firewall/firewall-lib.pl";
  28 require "${General::swroot}/location-functions.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 @PRIVATE_NETWORKS = (
  52         "10.0.0.0/8",
  53         "172.16.0.0/12",
  54         "192.168.0.0/16",
  55         "100.64.0.0/10",
  56 );
  57
  58 my %fwdfwsettings=();
  59 my %fwoptions = ();
  60 my %defaultNetworks=();
  61 my %configfwdfw=();;
  62 my %customgrp=();
  63 my %configinputfw=();
  64 my %configoutgoingfw=();
  65 my %confignatfw=();
  66 my %locationsettings = (
  67         "LOCATIONBLOCK_ENABLED" => "off"
  68 );
  69
  70 my @p2ps=();
  71
  72 my $configfwdfw         = "${General::swroot}/firewall/config";
  73 my $configinput     = "${General::swroot}/firewall/input";
  74 my $configoutgoing  = "${General::swroot}/firewall/outgoing";
  75 my $p2pfile                     = "${General::swroot}/firewall/p2protocols";
  76 my $locationfile                = "${General::swroot}/firewall/locationblock";
  77 my $configgrp           = "${General::swroot}/fwhosts/customgroups";
  78 my $netsettings         = "${General::swroot}/ethernet/settings";
  79
  80 &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings);
  81 &General::readhash("${General::swroot}/optionsfw/settings", \%fwoptions);
  82 &General::readhash("$netsettings", \%defaultNetworks);
  83 &General::readhasharray($configfwdfw, \%configfwdfw);
  84 &General::readhasharray($configinput, \%configinputfw);
  85 &General::readhasharray($configoutgoing, \%configoutgoingfw);
  86 &General::readhasharray($configgrp, \%customgrp);
  87
  88 # Check if the location settings file exists
  89 if (-e "$locationfile") {
  90         # Read settings file
  91         &General::readhash("$locationfile", \%locationsettings);
  92 }
  93
  94 # Get all available locations.
  95 my @locations = &Location::Functions::get_locations();
  96
  97 my @log_limit_options = &make_log_limit_options();
  98
  99 my $POLICY_INPUT_ALLOWED   = 0;
 100 my $POLICY_FORWARD_ALLOWED = ($fwdfwsettings{"POLICY"} eq "MODE2");
 101 my $POLICY_OUTPUT_ALLOWED  = ($fwdfwsettings{"POLICY1"} eq "MODE2");
 102
 103 my $POLICY_INPUT_ACTION    = $fwoptions{"FWPOLICY2"};
 104 my $POLICY_FORWARD_ACTION  = $fwoptions{"FWPOLICY"};
 105 my $POLICY_OUTPUT_ACTION   = $fwoptions{"FWPOLICY1"};
 106
 107 # MAIN
 108 &main();
 109
 110 sub main {
 111         # Flush all chains.
 112         &flush();
 113
 114         # Prepare firewall rules.
 115         if (! -z  "${General::swroot}/firewall/input"){
 116                 &buildrules(\%configinputfw);
 117         }
 118         if (! -z  "${General::swroot}/firewall/outgoing"){
 119                 &buildrules(\%configoutgoingfw);
 120         }
 121         if (! -z  "${General::swroot}/firewall/config"){
 122                 &buildrules(\%configfwdfw);
 123         }
 124
 125         # Load P2P block rules.
 126         &p2pblock();
 127
 128         # Load Location block rules.
 129         &locationblock();
 130
 131         # Reload firewall policy.
 132         run("/usr/sbin/firewall-policy");
 133
 134         #Reload firewall.local if present
 135         if ( -f '/etc/sysconfig/firewall.local'){
 136                 run("/etc/sysconfig/firewall.local reload");
 137         }
 138 }
 139
 140 sub run {
 141         # Executes or prints the given shell command.
 142         my $command = shift;
 143
 144         if ($DEBUG) {
 145                 print "$command\n";
 146         } else {
 147                 system "$command";
 148
 149                 if ($?) {
 150                         print_error("ERROR: $command");
 151                 }
 152         }
 153 }
 154
 155 sub print_error {
 156         my $message = shift;
 157
 158         print STDERR "$message\n";
 159 }
 160
 161 sub print_rule {
 162         my $hash = shift;
 163
 164         print "\nRULE:";
 165
 166         my $i = 0;
 167         foreach (@$hash) {
 168                 printf("  %2d: %s", $i++, $_);
 169         }
 170         print "\n";
 171 }
 172
 173 sub count_elements {
 174         my $hash = shift;
 175
 176         return scalar @$hash;
 177 }
 178
 179 sub flush {
 180         run("$IPTABLES -F $CHAIN_INPUT");
 181         run("$IPTABLES -F $CHAIN_FORWARD");
 182         run("$IPTABLES -F $CHAIN_OUTPUT");
 183         run("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE");
 184         run("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION");
 185         run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX");
 186 }
 187
 188 sub buildrules {
 189         my $hash = shift;
 190
 191         # Search for targets that need to be specially handled when adding
 192         # forwarding rules. Additional rules will automatically get inserted
 193         # into the INPUT/OUTPUT chains for these targets.
 194         my @special_input_targets = ();
 195         if (!$POLICY_FORWARD_ALLOWED) {
 196                 push(@special_input_targets, "ACCEPT");
 197         }
 198
 199         if ($POLICY_INPUT_ACTION eq "DROP") {
 200                 push(@special_input_targets, ("ACCEPT", "REJECT"));
 201         } elsif ($POLICY_INPUT_ACTION eq "REJECT") {
 202                 push(@special_input_targets, ("ACCEPT", "DROP"));
 203         }
 204
 205         my @special_output_targets = ();
 206         if ($POLICY_OUTPUT_ALLOWED) {
 207                 push(@special_output_targets, ("DROP", "REJECT"));
 208         } else {
 209                 push(@special_output_targets, "ACCEPT");
 210
 211                 if ($POLICY_OUTPUT_ACTION eq "DROP") {
 212                         push(@special_output_targets, ("ACCEPT", "REJECT"));
 213                 } elsif ($POLICY_OUTPUT_ACTION eq "REJECT") {
 214                         push(@special_output_targets, ("ACCEPT", "DROP"));
 215                 }
 216         }
 217
 218         foreach my $key (sort {$a <=> $b} keys %$hash) {
 219                 # Skip disabled rules.
 220                 next unless ($$hash{$key}[2] eq 'ON');
 221
 222                 # Count number of elements in this line
 223                 my $elements = &count_elements($$hash{$key});
 224
 225                 if ($DEBUG) {
 226                         print_rule($$hash{$key});
 227                 }
 228
 229                 # Check if the target is valid.
 230                 my $target = $$hash{$key}[0];
 231                 if (!$target ~~ @VALID_TARGETS) {
 232                         print_error("Invalid target '$target' for rule $key");
 233                         next;
 234                 }
 235
 236                 # Check if the chain is valid.
 237                 my $chain = $$hash{$key}[1];
 238                 if (!$chain ~~ @VALID_CHAINS) {
 239                         print_error("Invalid chain '$chain' in rule $key");
 240                         next;
 241                 }
 242
 243                 # Collect all sources.
 244                 my @sources = &fwlib::get_addresses($hash, $key, "src");
 245
 246                 # Collect all destinations.
 247                 my @destinations = &fwlib::get_addresses($hash, $key, "tgt");
 248
 249                 # True if the destination is the firewall itself.
 250                 my $destination_is_firewall = ($$hash{$key}[5] eq "ipfire");
 251
 252                 # Check if logging should be enabled.
 253                 my $LOG = ($$hash{$key}[17] eq 'ON');
 254
 255                 # Check if NAT is enabled and initialize variables, that we use for that.
 256                 my $NAT = ($$hash{$key}[28] eq 'ON');
 257                 my $NAT_MODE;
 258                 if ($NAT) {
 259                         $NAT_MODE = uc($$hash{$key}[31]);
 260                 }
 261
 262                 # Set up time constraints.
 263                 my @time_options = ();
 264                 if ($$hash{$key}[18] eq 'ON') {
 265                         push(@time_options, ("-m", "time"));
 266
 267                         # Select all days of the week this match is active.
 268                         my @weekdays = ();
 269                         if ($$hash{$key}[19] ne '') {
 270                                 push (@weekdays, "Mon");
 271                         }
 272                         if ($$hash{$key}[20] ne '') {
 273                                 push (@weekdays, "Tue");
 274                         }
 275                         if ($$hash{$key}[21] ne '') {
 276                                 push (@weekdays, "Wed");
 277                         }
 278                         if ($$hash{$key}[22] ne '') {
 279                                 push (@weekdays, "Thu");
 280                         }
 281                         if ($$hash{$key}[23] ne '') {
 282                                 push (@weekdays, "Fri");
 283                         }
 284                         if ($$hash{$key}[24] ne '') {
 285                                 push (@weekdays, "Sat");
 286                         }
 287                         if ($$hash{$key}[25] ne '') {
 288                                 push (@weekdays, "Sun");
 289                         }
 290                         if (@weekdays) {
 291                                 push(@time_options, ("--weekdays", join(",", @weekdays)));
 292                         }
 293
 294                         # Convert start time.
 295                         my $time_start = &format_time($$hash{$key}[26]);
 296                         if ($time_start) {
 297                                 push(@time_options, ("--timestart", $time_start));
 298                         }
 299
 300                         # Convert end time.
 301                         my $time_stop = &format_time($$hash{$key}[27]);
 302                         if ($time_stop) {
 303                                 push(@time_options, ("--timestop", $time_stop));
 304                         }
 305                 }
 306
 307                 # Concurrent connection limit
 308                 my @ratelimit_options = ();
 309
 310                 if (($elements ge 34) && ($$hash{$key}[32] eq 'ON')) {
 311                         my $conn_limit = $$hash{$key}[33];
 312
 313                         if ($conn_limit ge 1) {
 314                                 push(@ratelimit_options, ("-m", "connlimit"));
 315
 316                                 # Use the the entire source IP address
 317                                 push(@ratelimit_options, "--connlimit-saddr");
 318                                 push(@ratelimit_options, ("--connlimit-mask", "32"));
 319
 320                                 # Apply the limit
 321                                 push(@ratelimit_options, ("--connlimit-upto", $conn_limit));
 322                         }
 323                 }
 324
 325                 # Ratelimit
 326                 if (($elements ge 37) && ($$hash{$key}[34] eq 'ON')) {
 327                         my $rate_limit = "$$hash{$key}[35]/$$hash{$key}[36]";
 328
 329                         if ($rate_limit) {
 330                                 push(@ratelimit_options, ("-m", "limit"));
 331                                 push(@ratelimit_options, ("--limit", $rate_limit));
 332                         }
 333                 }
 334
 335                 # Check which protocols are used in this rule and so that we can
 336                 # later group rules by protocols.
 337                 my @protocols = &get_protocols($hash, $key);
 338                 if (!@protocols) {
 339                         print_error("Invalid protocol configuration for rule $key");
 340                         next;
 341                 }
 342
 343                 foreach my $protocol (@protocols) {
 344                         # Check if the given protocol is supported.
 345                         if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) {
 346                                 print_error("Protocol $protocol is not supported (rule $key)");
 347                                 next;
 348                         }
 349
 350                         # Prepare protocol options (like ICMP types, ports, etc...).
 351                         my @protocol_options = &get_protocol_options($hash, $key, $protocol, 0);
 352
 353                         # Check if this protocol knows ports.
 354                         my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS);
 355
 356                         foreach my $src (@sources) {
 357                                 # Skip invalid source.
 358                                 next unless (defined $src);
 359                                 next unless ($src);
 360
 361                                 # Sanitize source.
 362                                 my $source = @$src[0];
 363                                 if ($source ~~ @ANY_ADDRESSES) {
 364                                         $source = "";
 365                                 }
 366
 367                                 my $source_intf = @$src[1];
 368
 369                                 foreach my $dst (@destinations) {
 370                                         # Skip invalid rules.
 371                                         next unless (defined $dst);
 372                                         next if (!$dst || ($dst eq "none"));
 373
 374                                         # Sanitize destination.
 375                                         my $destination = @$dst[0];
 376                                         if ($destination ~~ @ANY_ADDRESSES) {
 377                                                 $destination = "";
 378                                         }
 379
 380                                         my $destination_intf = @$dst[1];
 381
 382                                         # Array with iptables arguments.
 383                                         my @options = ();
 384
 385                                         # Append protocol.
 386                                         if ($protocol ne "all") {
 387                                                 push(@options, @protocol_options);
 388                                         }
 389
 390                                         # Prepare source options.
 391                                         my @source_options = ();
 392                                         if ($source =~ /mac/) {
 393                                                 push(@source_options, $source);
 394                                         } elsif ($source =~ /-m geoip/) {
 395                                                 push(@source_options, $source);
 396                                         } elsif($source) {
 397                                                 push(@source_options, ("-s", $source));
 398                                         }
 399
 400                                         # Prepare destination options.
 401                                         my @destination_options = ();
 402                                         if ($destination =~ /-m geoip/) {
 403                                                 push(@destination_options,  $destination);
 404                                         } elsif ($destination) {
 405                                                 push(@destination_options, ("-d", $destination));
 406                                         }
 407
 408                                         # Add source and destination interface to the filter rules.
 409                                         # These are supposed to help filtering forged packets that originate
 410                                         # from BLUE with an IP address from GREEN for instance.
 411                                         my @source_intf_options = ();
 412                                         if ($source_intf) {
 413                                                 push(@source_intf_options, ("-i", $source_intf));
 414                                         }
 415
 416                                         my @destination_intf_options = ();
 417                                         if ($destination_intf) {
 418                                                 push(@destination_intf_options, ("-o", $destination_intf));
 419                                         }
 420
 421                                         # Add time constraint options.
 422                                         push(@options, @time_options);
 423
 424                                         # Add ratelimiting option
 425                                         push(@options, @ratelimit_options);
 426
 427                                         my $firewall_is_in_source_subnet = 1;
 428                                         if ($source) {
 429                                                 $firewall_is_in_source_subnet = &firewall_is_in_subnet($source);
 430                                         }
 431
 432                                         my $firewall_is_in_destination_subnet = 1;
 433                                         if ($destination) {
 434                                                 $firewall_is_in_destination_subnet = &firewall_is_in_subnet($destination);
 435                                         }
 436
 437                                         # Process NAT rules.
 438                                         if ($NAT) {
 439                                                 my $nat_address = &fwlib::get_nat_address($$hash{$key}[29], $source);
 440
 441                                                 # Skip NAT rules if the NAT address is unknown
 442                                                 # (i.e. no internet connection has been established, yet).
 443                                                 next unless ($nat_address);
 444
 445                                                 # Destination NAT
 446                                                 if ($NAT_MODE eq "DNAT") {
 447                                                         my @nat_options = ();
 448                                                         if ($protocol ne "all") {
 449                                                                 my @nat_protocol_options = &get_protocol_options($hash, $key, $protocol, 1);
 450                                                                 push(@nat_options, @nat_protocol_options);
 451                                                         }
 452
 453                                                         # Add time options.
 454                                                         push(@nat_options, @time_options);
 455
 456                                                         # Determine if a REDIRECT rule should be created.
 457                                                         my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports);
 458
 459                                                         # Make port-forwardings useable from the internal networks.
 460                                                         if (!$use_redirect) {
 461                                                                 my @internal_addresses = &fwlib::get_internal_firewall_ip_addresses(1);
 462                                                                 unless ($nat_address ~~ @internal_addresses) {
 463                                                                         &add_dnat_mangle_rules($nat_address, $source_intf, @nat_options);
 464                                                                 }
 465                                                         }
 466
 467                                                         # Add source options.
 468                                                         push(@nat_options, @source_options);
 469
 470                                                         # Add NAT address.
 471                                                         if (!$use_redirect) {
 472                                                                 push(@nat_options, ("-d", $nat_address));
 473                                                         }
 474
 475                                                         my $dnat_port;
 476                                                         if ($protocol_has_ports) {
 477                                                                 $dnat_port = &get_dnat_target_port($hash, $key);
 478                                                         }
 479
 480                                                         my @nat_action_options = ();
 481
 482                                                         # Use iptables REDIRECT
 483                                                         if ($use_redirect) {
 484                                                                 push(@nat_action_options, ("-j", "REDIRECT"));
 485
 486                                                                 # Redirect to specified port if one has given.
 487                                                                 if ($dnat_port) {
 488                                                                         push(@nat_action_options, ("--to-ports", $dnat_port));
 489                                                                 }
 490
 491                                                         # Use iptables DNAT
 492                                                         } else {
 493                                                                 if ($destination_is_firewall && !$destination) {
 494                                                                         $destination = &fwlib::get_external_address();
 495                                                                 }
 496                                                                 next unless ($destination);
 497
 498                                                                 my ($dnat_address, $dnat_mask) = split("/", $destination);
 499                                                                 @destination_options = ("-d", $dnat_address);
 500
 501                                                                 if ($protocol_has_ports) {
 502                                                                         my $dnat_port = &get_dnat_target_port($hash, $key);
 503
 504                                                                         if ($dnat_port) {
 505                                                                                 $dnat_address .= ":$dnat_port";
 506                                                                         }
 507                                                                 }
 508
 509                                                                 push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address));
 510                                                         }
 511
 512                                                         if ($LOG) {
 513                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '");
 514                                                         }
 515                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options");
 516
 517                                                 # Source NAT
 518                                                 } elsif ($NAT_MODE eq "SNAT") {
 519                                                         my @snat_options = ( "-m", "policy", "--dir", "out", "--pol", "none" );
 520                                                         my @nat_options = @options;
 521
 522                                                         # Get addresses for the configured firewall interfaces.
 523                                                         my @local_addresses = &fwlib::get_internal_firewall_ip_addresses(1);
 524
 525                                                         # Check if the nat_address is one of the local addresses.
 526                                                         foreach my $local_address (@local_addresses) {
 527                                                                 if ($nat_address eq $local_address) {
 528                                                                         # Clear SNAT options.
 529                                                                         @snat_options = ();
 530
 531                                                                         # Finish loop.
 532                                                                         last;
 533                                                                 }
 534                                                         }
 535
 536                                                         push(@nat_options, @destination_intf_options);
 537                                                         push(@nat_options, @source_options);
 538                                                         push(@nat_options, @destination_options);
 539
 540                                                         if ($LOG) {
 541                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options @log_limit_options -j LOG --log-prefix 'SNAT '");
 542                                                         }
 543                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options -j SNAT --to-source $nat_address");
 544                                                 }
 545                                         }
 546
 547                                         push(@options, @source_options);
 548                                         push(@options, @destination_options);
 549
 550                                         # Insert firewall rule.
 551                                         if ($LOG) {
 552                                                 run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options @log_limit_options -j LOG --log-prefix '$chain '");
 553                                         }
 554                                         run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options -j $target");
 555
 556                                         # Handle forwarding rules and add corresponding rules for firewall access.
 557                                         if ($chain eq $CHAIN_FORWARD) {
 558                                                 # If the firewall is part of the destination subnet and access to the destination network
 559                                                 # is granted/forbidden for any network that the firewall itself is part of, we grant/forbid access
 560                                                 # for the firewall, too.
 561                                                 if ($firewall_is_in_destination_subnet && ($target ~~ @special_input_targets)) {
 562                                                         if ($LOG) {
 563                                                                 run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '");
 564                                                         }
 565                                                         run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options -j $target");
 566                                                 }
 567
 568                                                 # Likewise.
 569                                                 if ($firewall_is_in_source_subnet && ($target ~~ @special_output_targets)) {
 570                                                         if ($LOG) {
 571                                                                 run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_OUTPUT '");
 572                                                         }
 573                                                         run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options -j $target");
 574                                                 }
 575                                         }
 576                                 }
 577                         }
 578                 }
 579         }
 580 }
 581
 582 # Formats the given timestamp into the iptables format which is "hh:mm" UTC.
 583 sub format_time {
 584         my $val = shift;
 585
 586         # Convert the given time into minutes.
 587         my $minutes = &time_convert_to_minutes($val);
 588
 589         # Move the timestamp into UTC.
 590         $minutes += &time_utc_offset();
 591
 592         # Make sure $minutes is between 00:00 and 23:59.
 593         if ($minutes < 0) {
 594                 $minutes += 1440;
 595         }
 596
 597         if ($minutes > 1440) {
 598                 $minutes -= 1440;
 599         }
 600
 601         # Format as hh:mm.
 602         return sprintf("%02d:%02d", $minutes / 60, $minutes % 60);
 603 }
 604
 605 # Calculates the offsets in minutes from the local timezone to UTC.
 606 sub time_utc_offset {
 607         my @localtime = localtime(time);
 608         my @gmtime = gmtime(time);
 609
 610         return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60);
 611 }
 612
 613 # Takes a timestamp like "14:00" and converts it into minutes since midnight.
 614 sub time_convert_to_minutes {
 615         my ($hrs, $min) = split(":", shift);
 616
 617         return ($hrs * 60) + $min;
 618 }
 619
 620 sub p2pblock {
 621         open(FILE, "<$p2pfile") or die "Unable to read $p2pfile";
 622         my @protocols = ();
 623         foreach my $p2pentry (<FILE>) {
 624                 my @p2pline = split(/\;/, $p2pentry);
 625                 next unless ($p2pline[2] eq "off");
 626
 627                 push(@protocols, "--$p2pline[1]");
 628         }
 629         close(FILE);
 630
 631         run("$IPTABLES -F P2PBLOCK");
 632         if (@protocols) {
 633                 run("$IPTABLES -A P2PBLOCK -m ipp2p @protocols -j DROP");
 634         }
 635 }
 636
 637 sub locationblock {
 638         # Flush iptables chain.
 639         run("$IPTABLES -F LOCATIONBLOCK");
 640
 641         # If location blocking is not enabled, we are finished here.
 642         if ($locationsettings{'LOCATIONBLOCK_ENABLED'} ne "on") {
 643                 # Exit submodule. Process remaining script.
 644                 return;
 645         }
 646
 647         # Only check the RED interface, which is ppp0 in case of RED_TYPE being
 648         # set to "PPPOE", and red0 in case of RED_TYPE not being empty otherwise.
 649         if ($defaultNetworks{'RED_TYPE'} eq "PPPOE") {
 650                 run("$IPTABLES -A LOCATIONBLOCK ! -i ppp0 -j RETURN");
 651         } elsif ($defaultNetworks{'RED_DEV'} ne "") {
 652                 run("$IPTABLES -A LOCATIONBLOCK ! -i $defaultNetworks{'RED_DEV'} -j RETURN");
 653         }
 654
 655         # Do not check any private address space
 656         foreach my $network (@PRIVATE_NETWORKS) {
 657                 run("$IPTABLES -A LOCATIONBLOCK -s $network -j RETURN");
 658         }
 659
 660         # Loop through all supported locations and
 661         # create iptables rules, if blocking for this country
 662         # is enabled.
 663         foreach my $location (@locations) {
 664                 if(exists $locationsettings{$location} && $locationsettings{$location} eq "on") {
 665                         run("$IPTABLES -A LOCATIONBLOCK -m geoip --src-cc $location -j DROP");
 666                 }
 667         }
 668 }
 669
 670 sub get_protocols {
 671         my $hash = shift;
 672         my $key = shift;
 673
 674         my $uses_source_ports = ($$hash{$key}[7] eq "ON");
 675         my $uses_services = ($$hash{$key}[11] eq "ON");
 676
 677         my @protocols = ();
 678
 679         # Rules which don't have source ports or services (like ICMP, ESP, ...).
 680         if (!$uses_source_ports && !$uses_services) {
 681                 push(@protocols, $$hash{$key}[8]);
 682
 683         # Rules which either use ports or services.
 684         } elsif ($uses_source_ports || $uses_services) {
 685                 # Check if service group or service
 686                 if ($$hash{$key}[14] eq 'cust_srv') {
 687                         push(@protocols, &fwlib::get_srv_prot($$hash{$key}[15]));
 688
 689                 } elsif($$hash{$key}[14] eq 'cust_srvgrp'){
 690                         my $protos = &fwlib::get_srvgrp_prot($$hash{$key}[15]);
 691                         push(@protocols, split(",", $protos));
 692
 693                 } else {
 694                         # Fetch the protocol for this rule.
 695                         my $protocol = lc($$hash{$key}[8]);
 696
 697                         # Fetch source and destination ports for this rule.
 698                         my $source_ports = $$hash{$key}[10];
 699                         my $destination_ports = $$hash{$key}[15];
 700
 701                         # Check if ports are set for protocols which do not support ports.
 702                         if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) {
 703                                 print_error("$protocol does not support ports");
 704                                 return ();
 705                         }
 706
 707                         push(@protocols, $protocol);
 708                 }
 709         }
 710
 711         # Remove all empty elements
 712         @protocols = map { $_ ? $_ : () } @protocols;
 713
 714         # If no protocol has been defined, we assume "all".
 715         if (!@protocols) {
 716                 push(@protocols, "all");
 717         }
 718
 719         # Make all protocol names lowercase.
 720         @protocols = map { lc } @protocols;
 721
 722         return @protocols;
 723 }
 724
 725 sub get_protocol_options {
 726         my $hash = shift;
 727         my $key  = shift;
 728         my $protocol = shift;
 729         my $nat_options_wanted = shift;
 730         my @options = ();
 731
 732         # Nothing to do if no protocol is specified.
 733         if ($protocol eq "all") {
 734                 return @options;
 735         } else {
 736                 push(@options, ("-p", $protocol));
 737         }
 738
 739         if ($protocol ~~ @PROTOCOLS_WITH_PORTS) {
 740                 # Process source ports.
 741                 my $use_src_ports = ($$hash{$key}[7] eq "ON");
 742                 my $src_ports     = $$hash{$key}[10];
 743
 744                 if ($use_src_ports && $src_ports) {
 745                         push(@options, &format_ports($src_ports, "src"));
 746                 }
 747
 748                 # Process destination ports.
 749                 my $use_dst_ports  = ($$hash{$key}[11] eq "ON");
 750                 my $use_dnat       = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat"));
 751
 752                 if ($use_dst_ports) {
 753                         my $dst_ports_mode = $$hash{$key}[14];
 754                         my $dst_ports      = $$hash{$key}[15];
 755
 756                         if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) {
 757                                 if ($nat_options_wanted && $use_dnat && $$hash{$key}[30]) {
 758                                         $dst_ports = $$hash{$key}[30];
 759                                 }
 760                                 push(@options, &format_ports($dst_ports, "dst"));
 761
 762                         } elsif ($dst_ports_mode eq "cust_srv") {
 763                                 if ($protocol eq "ICMP") {
 764                                         push(@options, ("--icmp-type", &fwlib::get_srv_port($dst_ports, 3, "ICMP")));
 765                                 } else {
 766                                         $dst_ports = &fwlib::get_srv_port($dst_ports, 1, uc($protocol));
 767                                         push(@options, &format_ports($dst_ports, "dst"));
 768                                 }
 769
 770                         } elsif ($dst_ports_mode eq "cust_srvgrp") {
 771                                 push(@options, &fwlib::get_srvgrp_port($dst_ports, uc($protocol)));
 772                         }
 773                 }
 774         }
 775
 776         # Check if a single ICMP type is selected.
 777         if ($protocol eq "icmp") {
 778                 my $icmp_type = $$hash{$key}[9];
 779
 780                 if (($icmp_type ne "All ICMP-Types") && $icmp_type) {
 781                         push(@options, ("--icmp-type", $icmp_type));
 782                 }
 783         }
 784
 785         return @options;
 786 }
 787
 788 sub format_ports {
 789         my $ports = shift;
 790         my $type = shift;
 791
 792         my $arg;
 793         if ($type eq "src") {
 794                 $arg = "--sport";
 795         } elsif ($type eq "dst") {
 796                 $arg = "--dport";
 797         }
 798
 799         my @options = ();
 800
 801         if ($ports =~ /\|/) {
 802                 $ports =~ s/\|/,/g;
 803                 push(@options, ("-m", "multiport"));
 804         }
 805
 806         if ($ports) {
 807                 push(@options, ($arg, $ports));
 808         }
 809
 810         return @options;
 811 }
 812
 813 sub get_dnat_target_port {
 814         my $hash = shift;
 815         my $key  = shift;
 816
 817         if ($$hash{$key}[14] eq "TGT_PORT") {
 818                 my $port = $$hash{$key}[15];
 819                 my $external_port = $$hash{$key}[30];
 820
 821                 if ($external_port && ($port ne $external_port)) {
 822                         return $$hash{$key}[15];
 823                 }
 824         }
 825 }
 826
 827 sub add_dnat_mangle_rules {
 828         my $nat_address = shift;
 829         my $interface = shift;
 830         my @options = @_;
 831
 832         my $mark = 0;
 833         foreach my $zone ("GREEN", "BLUE", "ORANGE") {
 834                 $mark++;
 835
 836                 # Skip rule if not all required information exists.
 837                 next unless (exists $defaultNetworks{$zone . "_NETADDRESS"});
 838                 next unless (exists $defaultNetworks{$zone . "_NETMASK"});
 839
 840                 next if ($interface && $interface ne $defaultNetworks{$zone . "_DEV"});
 841
 842                 my @mangle_options = @options;
 843
 844                 my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"};
 845                 $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"};
 846
 847                 push(@mangle_options, ("-s", $netaddress, "-d", $nat_address));
 848                 push(@mangle_options, ("-j", "MARK", "--set-mark", $mark));
 849
 850                 run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options");
 851         }
 852 }
 853
 854 sub make_log_limit_options {
 855         my @options = ("-m", "limit");
 856
 857         # Maybe we should get this from the configuration.
 858         my $limit = 10;
 859
 860         # We limit log messages to $limit messages per second.
 861         push(@options, ("--limit", "$limit/second"));
 862
 863         # And we allow bursts of 2x $limit.
 864         push(@options, ("--limit-burst", $limit * 2));
 865
 866         return @options;
 867 }
 868
 869 sub firewall_is_in_subnet {
 870         my $subnet = shift;
 871
 872         # ORANGE is missing here, because nothing may ever access
 873         # the firewall from this network.
 874         my $address = &fwlib::get_internal_firewall_ip_address($subnet, 0);
 875
 876         if ($address) {
 877                 return 1;
 878         }
 879
 880         return 0;
 881 }