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 # MARK masks
  59 my $NAT_MASK = 0x0f000000;
  60
  61 my %fwdfwsettings=();
  62 my %fwoptions = ();
  63 my %defaultNetworks=();
  64 my %configfwdfw=();;
  65 my %customgrp=();
  66 my %configinputfw=();
  67 my %configoutgoingfw=();
  68 my %confignatfw=();
  69 my %locationsettings = (
  70         "LOCATIONBLOCK_ENABLED" => "off"
  71 );
  72
  73 my @p2ps=();
  74
  75 my $configfwdfw         = "${General::swroot}/firewall/config";
  76 my $configinput     = "${General::swroot}/firewall/input";
  77 my $configoutgoing  = "${General::swroot}/firewall/outgoing";
  78 my $p2pfile                     = "${General::swroot}/firewall/p2protocols";
  79 my $locationfile                = "${General::swroot}/firewall/locationblock";
  80 my $configgrp           = "${General::swroot}/fwhosts/customgroups";
  81 my $netsettings         = "${General::swroot}/ethernet/settings";
  82
  83 &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings);
  84 &General::readhash("${General::swroot}/optionsfw/settings", \%fwoptions);
  85 &General::readhash("$netsettings", \%defaultNetworks);
  86 &General::readhasharray($configfwdfw, \%configfwdfw);
  87 &General::readhasharray($configinput, \%configinputfw);
  88 &General::readhasharray($configoutgoing, \%configoutgoingfw);
  89 &General::readhasharray($configgrp, \%customgrp);
  90
  91 # Check if the location settings file exists
  92 if (-e "$locationfile") {
  93         # Read settings file
  94         &General::readhash("$locationfile", \%locationsettings);
  95 }
  96
  97 # Get all available locations.
  98 my @locations = &Location::Functions::get_locations();
  99
 100 my @log_limit_options = &make_log_limit_options();
 101
 102 my $POLICY_INPUT_ALLOWED   = 0;
 103 my $POLICY_FORWARD_ALLOWED = ($fwdfwsettings{"POLICY"} eq "MODE2");
 104 my $POLICY_OUTPUT_ALLOWED  = ($fwdfwsettings{"POLICY1"} eq "MODE2");
 105
 106 my $POLICY_INPUT_ACTION    = $fwoptions{"FWPOLICY2"};
 107 my $POLICY_FORWARD_ACTION  = $fwoptions{"FWPOLICY"};
 108 my $POLICY_OUTPUT_ACTION   = $fwoptions{"FWPOLICY1"};
 109
 110 # MAIN
 111 &main();
 112
 113 sub main {
 114         # Flush all chains.
 115         &flush();
 116
 117         # Prepare firewall rules.
 118         if (! -z  "${General::swroot}/firewall/input"){
 119                 &buildrules(\%configinputfw);
 120         }
 121         if (! -z  "${General::swroot}/firewall/outgoing"){
 122                 &buildrules(\%configoutgoingfw);
 123         }
 124         if (! -z  "${General::swroot}/firewall/config"){
 125                 &buildrules(\%configfwdfw);
 126         }
 127
 128         # Load P2P block rules.
 129         &p2pblock();
 130
 131         # Load Location block rules.
 132         &locationblock();
 133
 134         # Reload firewall policy.
 135         run("/usr/sbin/firewall-policy");
 136
 137         #Reload firewall.local if present
 138         if ( -f '/etc/sysconfig/firewall.local'){
 139                 run("/etc/sysconfig/firewall.local reload");
 140         }
 141 }
 142
 143 sub run {
 144         # Executes or prints the given shell command.
 145         my $command = shift;
 146
 147         if ($DEBUG) {
 148                 print "$command\n";
 149         } else {
 150                 system "$command";
 151
 152                 if ($?) {
 153                         print_error("ERROR: $command");
 154                 }
 155         }
 156 }
 157
 158 sub print_error {
 159         my $message = shift;
 160
 161         print STDERR "$message\n";
 162 }
 163
 164 sub print_rule {
 165         my $hash = shift;
 166
 167         print "\nRULE:";
 168
 169         my $i = 0;
 170         foreach (@$hash) {
 171                 printf("  %2d: %s", $i++, $_);
 172         }
 173         print "\n";
 174 }
 175
 176 sub count_elements {
 177         my $hash = shift;
 178
 179         return scalar @$hash;
 180 }
 181
 182 sub flush {
 183         run("$IPTABLES -F $CHAIN_INPUT");
 184         run("$IPTABLES -F $CHAIN_FORWARD");
 185         run("$IPTABLES -F $CHAIN_OUTPUT");
 186         run("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE");
 187         run("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION");
 188         run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX");
 189 }
 190
 191 sub buildrules {
 192         my $hash = shift;
 193
 194         # Search for targets that need to be specially handled when adding
 195         # forwarding rules. Additional rules will automatically get inserted
 196         # into the INPUT/OUTPUT chains for these targets.
 197         my @special_input_targets = ();
 198         if (!$POLICY_FORWARD_ALLOWED) {
 199                 push(@special_input_targets, "ACCEPT");
 200         }
 201
 202         if ($POLICY_INPUT_ACTION eq "DROP") {
 203                 push(@special_input_targets, ("ACCEPT", "REJECT"));
 204         } elsif ($POLICY_INPUT_ACTION eq "REJECT") {
 205                 push(@special_input_targets, ("ACCEPT", "DROP"));
 206         }
 207
 208         my @special_output_targets = ();
 209         if ($POLICY_OUTPUT_ALLOWED) {
 210                 push(@special_output_targets, ("DROP", "REJECT"));
 211         } else {
 212                 push(@special_output_targets, "ACCEPT");
 213
 214                 if ($POLICY_OUTPUT_ACTION eq "DROP") {
 215                         push(@special_output_targets, ("ACCEPT", "REJECT"));
 216                 } elsif ($POLICY_OUTPUT_ACTION eq "REJECT") {
 217                         push(@special_output_targets, ("ACCEPT", "DROP"));
 218                 }
 219         }
 220
 221         foreach my $key (sort {$a <=> $b} keys %$hash) {
 222                 # Skip disabled rules.
 223                 next unless ($$hash{$key}[2] eq 'ON');
 224
 225                 # Count number of elements in this line
 226                 my $elements = &count_elements($$hash{$key});
 227
 228                 if ($DEBUG) {
 229                         print_rule($$hash{$key});
 230                 }
 231
 232                 # Check if the target is valid.
 233                 my $target = $$hash{$key}[0];
 234                 if (!$target ~~ @VALID_TARGETS) {
 235                         print_error("Invalid target '$target' for rule $key");
 236                         next;
 237                 }
 238
 239                 # Check if the chain is valid.
 240                 my $chain = $$hash{$key}[1];
 241                 if (!$chain ~~ @VALID_CHAINS) {
 242                         print_error("Invalid chain '$chain' in rule $key");
 243                         next;
 244                 }
 245
 246                 # Collect all sources.
 247                 my @sources = &fwlib::get_addresses($hash, $key, "src");
 248
 249                 # Collect all destinations.
 250                 my @destinations = &fwlib::get_addresses($hash, $key, "tgt");
 251
 252                 # True if the destination is the firewall itself.
 253                 my $destination_is_firewall = ($$hash{$key}[5] eq "ipfire");
 254
 255                 # Check if logging should be enabled.
 256                 my $LOG = ($$hash{$key}[17] eq 'ON');
 257
 258                 # Check if NAT is enabled and initialize variables, that we use for that.
 259                 my $NAT = ($$hash{$key}[28] eq 'ON');
 260                 my $NAT_MODE;
 261                 if ($NAT) {
 262                         $NAT_MODE = uc($$hash{$key}[31]);
 263                 }
 264
 265                 # Set up time constraints.
 266                 my @time_options = ();
 267                 if ($$hash{$key}[18] eq 'ON') {
 268                         push(@time_options, ("-m", "time"));
 269
 270                         # Select all days of the week this match is active.
 271                         my @weekdays = ();
 272                         if ($$hash{$key}[19] ne '') {
 273                                 push (@weekdays, "Mon");
 274                         }
 275                         if ($$hash{$key}[20] ne '') {
 276                                 push (@weekdays, "Tue");
 277                         }
 278                         if ($$hash{$key}[21] ne '') {
 279                                 push (@weekdays, "Wed");
 280                         }
 281                         if ($$hash{$key}[22] ne '') {
 282                                 push (@weekdays, "Thu");
 283                         }
 284                         if ($$hash{$key}[23] ne '') {
 285                                 push (@weekdays, "Fri");
 286                         }
 287                         if ($$hash{$key}[24] ne '') {
 288                                 push (@weekdays, "Sat");
 289                         }
 290                         if ($$hash{$key}[25] ne '') {
 291                                 push (@weekdays, "Sun");
 292                         }
 293                         if (@weekdays) {
 294                                 push(@time_options, ("--weekdays", join(",", @weekdays)));
 295                         }
 296
 297                         # Convert start time.
 298                         my $time_start = &format_time($$hash{$key}[26]);
 299                         if ($time_start) {
 300                                 push(@time_options, ("--timestart", $time_start));
 301                         }
 302
 303                         # Convert end time.
 304                         my $time_stop = &format_time($$hash{$key}[27]);
 305                         if ($time_stop) {
 306                                 push(@time_options, ("--timestop", $time_stop));
 307                         }
 308                 }
 309
 310                 # Concurrent connection limit
 311                 my @ratelimit_options = ();
 312
 313                 if (($elements ge 34) && ($$hash{$key}[32] eq 'ON')) {
 314                         my $conn_limit = $$hash{$key}[33];
 315
 316                         if ($conn_limit ge 1) {
 317                                 push(@ratelimit_options, ("-m", "connlimit"));
 318
 319                                 # Use the the entire source IP address
 320                                 push(@ratelimit_options, "--connlimit-saddr");
 321                                 push(@ratelimit_options, ("--connlimit-mask", "32"));
 322
 323                                 # Apply the limit
 324                                 push(@ratelimit_options, ("--connlimit-upto", $conn_limit));
 325                         }
 326                 }
 327
 328                 # Ratelimit
 329                 if (($elements ge 37) && ($$hash{$key}[34] eq 'ON')) {
 330                         my $rate_limit = "$$hash{$key}[35]/$$hash{$key}[36]";
 331
 332                         if ($rate_limit) {
 333                                 push(@ratelimit_options, ("-m", "limit"));
 334                                 push(@ratelimit_options, ("--limit", $rate_limit));
 335                         }
 336                 }
 337
 338                 # Check which protocols are used in this rule and so that we can
 339                 # later group rules by protocols.
 340                 my @protocols = &get_protocols($hash, $key);
 341                 if (!@protocols) {
 342                         print_error("Invalid protocol configuration for rule $key");
 343                         next;
 344                 }
 345
 346                 foreach my $protocol (@protocols) {
 347                         # Check if the given protocol is supported.
 348                         if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) {
 349                                 print_error("Protocol $protocol is not supported (rule $key)");
 350                                 next;
 351                         }
 352
 353                         # Prepare protocol options (like ICMP types, ports, etc...).
 354                         my @protocol_options = &get_protocol_options($hash, $key, $protocol, 0);
 355
 356                         # Check if this protocol knows ports.
 357                         my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS);
 358
 359                         foreach my $src (@sources) {
 360                                 # Skip invalid source.
 361                                 next unless (defined $src);
 362                                 next unless ($src);
 363
 364                                 # Sanitize source.
 365                                 my $source = @$src[0];
 366                                 if ($source ~~ @ANY_ADDRESSES) {
 367                                         $source = "";
 368                                 }
 369
 370                                 my $source_intf = @$src[1];
 371
 372                                 foreach my $dst (@destinations) {
 373                                         # Skip invalid rules.
 374                                         next unless (defined $dst);
 375                                         next if (!$dst || ($dst eq "none"));
 376
 377                                         # Sanitize destination.
 378                                         my $destination = @$dst[0];
 379                                         if ($destination ~~ @ANY_ADDRESSES) {
 380                                                 $destination = "";
 381                                         }
 382
 383                                         my $destination_intf = @$dst[1];
 384
 385                                         # Array with iptables arguments.
 386                                         my @options = ();
 387
 388                                         # Append protocol.
 389                                         if ($protocol ne "all") {
 390                                                 push(@options, @protocol_options);
 391                                         }
 392
 393                                         # Prepare source options.
 394                                         my @source_options = ();
 395                                         if ($source =~ /mac/) {
 396                                                 push(@source_options, $source);
 397                                         } elsif ($source =~ /-m geoip/) {
 398                                                 push(@source_options, $source);
 399                                         } elsif($source) {
 400                                                 push(@source_options, ("-s", $source));
 401                                         }
 402
 403                                         # Prepare destination options.
 404                                         my @destination_options = ();
 405                                         if ($destination =~ /-m geoip/) {
 406                                                 push(@destination_options,  $destination);
 407                                         } elsif ($destination) {
 408                                                 push(@destination_options, ("-d", $destination));
 409                                         }
 410
 411                                         # Add source and destination interface to the filter rules.
 412                                         # These are supposed to help filtering forged packets that originate
 413                                         # from BLUE with an IP address from GREEN for instance.
 414                                         my @source_intf_options = ();
 415                                         if ($source_intf) {
 416                                                 push(@source_intf_options, ("-i", $source_intf));
 417                                         }
 418
 419                                         my @destination_intf_options = ();
 420                                         if ($destination_intf) {
 421                                                 push(@destination_intf_options, ("-o", $destination_intf));
 422                                         }
 423
 424                                         # Add time constraint options.
 425                                         push(@options, @time_options);
 426
 427                                         # Add ratelimiting option
 428                                         push(@options, @ratelimit_options);
 429
 430                                         my $firewall_is_in_source_subnet = 1;
 431                                         if ($source) {
 432                                                 $firewall_is_in_source_subnet = &firewall_is_in_subnet($source);
 433                                         }
 434
 435                                         my $firewall_is_in_destination_subnet = 1;
 436                                         if ($destination) {
 437                                                 $firewall_is_in_destination_subnet = &firewall_is_in_subnet($destination);
 438                                         }
 439
 440                                         # Process NAT rules.
 441                                         if ($NAT) {
 442                                                 my $nat_address = &fwlib::get_nat_address($$hash{$key}[29], $source);
 443
 444                                                 # Skip NAT rules if the NAT address is unknown
 445                                                 # (i.e. no internet connection has been established, yet).
 446                                                 next unless ($nat_address);
 447
 448                                                 # Destination NAT
 449                                                 if ($NAT_MODE eq "DNAT") {
 450                                                         my @nat_options = ();
 451                                                         if ($protocol ne "all") {
 452                                                                 my @nat_protocol_options = &get_protocol_options($hash, $key, $protocol, 1);
 453                                                                 push(@nat_options, @nat_protocol_options);
 454                                                         }
 455
 456                                                         # Add time options.
 457                                                         push(@nat_options, @time_options);
 458
 459                                                         # Determine if a REDIRECT rule should be created.
 460                                                         my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports);
 461
 462                                                         # Make port-forwardings useable from the internal networks.
 463                                                         if (!$use_redirect) {
 464                                                                 my @internal_addresses = &fwlib::get_internal_firewall_ip_addresses(1);
 465                                                                 unless ($nat_address ~~ @internal_addresses) {
 466                                                                         &add_dnat_mangle_rules($nat_address, $source_intf, @nat_options);
 467                                                                 }
 468                                                         }
 469
 470                                                         # Add source options.
 471                                                         push(@nat_options, @source_options);
 472
 473                                                         # Add NAT address.
 474                                                         if (!$use_redirect) {
 475                                                                 push(@nat_options, ("-d", $nat_address));
 476                                                         }
 477
 478                                                         my $dnat_port;
 479                                                         if ($protocol_has_ports) {
 480                                                                 $dnat_port = &get_dnat_target_port($hash, $key);
 481                                                         }
 482
 483                                                         my @nat_action_options = ();
 484
 485                                                         # Use iptables REDIRECT
 486                                                         if ($use_redirect) {
 487                                                                 push(@nat_action_options, ("-j", "REDIRECT"));
 488
 489                                                                 # Redirect to specified port if one has given.
 490                                                                 if ($dnat_port) {
 491                                                                         push(@nat_action_options, ("--to-ports", $dnat_port));
 492                                                                 }
 493
 494                                                         # Use iptables DNAT
 495                                                         } else {
 496                                                                 if ($destination_is_firewall && !$destination) {
 497                                                                         $destination = &fwlib::get_external_address();
 498                                                                 }
 499                                                                 next unless ($destination);
 500
 501                                                                 my ($dnat_address, $dnat_mask) = split("/", $destination);
 502                                                                 @destination_options = ("-d", $dnat_address);
 503
 504                                                                 if ($protocol_has_ports) {
 505                                                                         my $dnat_port = &get_dnat_target_port($hash, $key);
 506
 507                                                                         if ($dnat_port) {
 508                                                                                 $dnat_address .= ":$dnat_port";
 509                                                                         }
 510                                                                 }
 511
 512                                                                 push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address));
 513                                                         }
 514
 515                                                         if ($LOG) {
 516                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '");
 517                                                         }
 518                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options");
 519
 520                                                 # Source NAT
 521                                                 } elsif ($NAT_MODE eq "SNAT") {
 522                                                         my @snat_options = ( "-m", "policy", "--dir", "out", "--pol", "none" );
 523                                                         my @nat_options = @options;
 524
 525                                                         # Get addresses for the configured firewall interfaces.
 526                                                         my @local_addresses = &fwlib::get_internal_firewall_ip_addresses(1);
 527
 528                                                         # Check if the nat_address is one of the local addresses.
 529                                                         foreach my $local_address (@local_addresses) {
 530                                                                 if ($nat_address eq $local_address) {
 531                                                                         # Clear SNAT options.
 532                                                                         @snat_options = ();
 533
 534                                                                         # Finish loop.
 535                                                                         last;
 536                                                                 }
 537                                                         }
 538
 539                                                         push(@nat_options, @destination_intf_options);
 540                                                         push(@nat_options, @source_options);
 541                                                         push(@nat_options, @destination_options);
 542
 543                                                         if ($LOG) {
 544                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options @log_limit_options -j LOG --log-prefix 'SNAT '");
 545                                                         }
 546                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options -j SNAT --to-source $nat_address");
 547                                                 }
 548                                         }
 549
 550                                         push(@options, @source_options);
 551                                         push(@options, @destination_options);
 552
 553                                         # Insert firewall rule.
 554                                         if ($LOG) {
 555                                                 run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options @log_limit_options -j LOG --log-prefix '$chain '");
 556                                         }
 557                                         run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options -j $target");
 558
 559                                         # Handle forwarding rules and add corresponding rules for firewall access.
 560                                         if ($chain eq $CHAIN_FORWARD) {
 561                                                 # If the firewall is part of the destination subnet and access to the destination network
 562                                                 # is granted/forbidden for any network that the firewall itself is part of, we grant/forbid access
 563                                                 # for the firewall, too.
 564                                                 if ($firewall_is_in_destination_subnet && ($target ~~ @special_input_targets)) {
 565                                                         if ($LOG) {
 566                                                                 run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '");
 567                                                         }
 568                                                         run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options -j $target");
 569                                                 }
 570
 571                                                 # Likewise.
 572                                                 if ($firewall_is_in_source_subnet && ($target ~~ @special_output_targets)) {
 573                                                         if ($LOG) {
 574                                                                 run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_OUTPUT '");
 575                                                         }
 576                                                         run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options -j $target");
 577                                                 }
 578                                         }
 579                                 }
 580                         }
 581                 }
 582         }
 583 }
 584
 585 # Formats the given timestamp into the iptables format which is "hh:mm" UTC.
 586 sub format_time {
 587         my $val = shift;
 588
 589         # Convert the given time into minutes.
 590         my $minutes = &time_convert_to_minutes($val);
 591
 592         # Move the timestamp into UTC.
 593         $minutes += &time_utc_offset();
 594
 595         # Make sure $minutes is between 00:00 and 23:59.
 596         if ($minutes < 0) {
 597                 $minutes += 1440;
 598         }
 599
 600         if ($minutes > 1440) {
 601                 $minutes -= 1440;
 602         }
 603
 604         # Format as hh:mm.
 605         return sprintf("%02d:%02d", $minutes / 60, $minutes % 60);
 606 }
 607
 608 # Calculates the offsets in minutes from the local timezone to UTC.
 609 sub time_utc_offset {
 610         my @localtime = localtime(time);
 611         my @gmtime = gmtime(time);
 612
 613         return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60);
 614 }
 615
 616 # Takes a timestamp like "14:00" and converts it into minutes since midnight.
 617 sub time_convert_to_minutes {
 618         my ($hrs, $min) = split(":", shift);
 619
 620         return ($hrs * 60) + $min;
 621 }
 622
 623 sub p2pblock {
 624         open(FILE, "<$p2pfile") or die "Unable to read $p2pfile";
 625         my @protocols = ();
 626         foreach my $p2pentry (<FILE>) {
 627                 my @p2pline = split(/\;/, $p2pentry);
 628                 next unless ($p2pline[2] eq "off");
 629
 630                 push(@protocols, "--$p2pline[1]");
 631         }
 632         close(FILE);
 633
 634         run("$IPTABLES -F P2PBLOCK");
 635         if (@protocols) {
 636                 run("$IPTABLES -A P2PBLOCK -m ipp2p @protocols -j DROP");
 637         }
 638 }
 639
 640 sub locationblock {
 641         # Flush iptables chain.
 642         run("$IPTABLES -F LOCATIONBLOCK");
 643
 644         # If location blocking is not enabled, we are finished here.
 645         if ($locationsettings{'LOCATIONBLOCK_ENABLED'} ne "on") {
 646                 # Exit submodule. Process remaining script.
 647                 return;
 648         }
 649
 650         # Only check the RED interface, which is ppp0 in case of RED_TYPE being
 651         # set to "PPPOE", and red0 in case of RED_TYPE not being empty otherwise.
 652         if ($defaultNetworks{'RED_TYPE'} eq "PPPOE") {
 653                 run("$IPTABLES -A LOCATIONBLOCK ! -i ppp0 -j RETURN");
 654         } elsif ($defaultNetworks{'RED_DEV'} ne "") {
 655                 run("$IPTABLES -A LOCATIONBLOCK ! -i $defaultNetworks{'RED_DEV'} -j RETURN");
 656         }
 657
 658         # Do not check any private address space
 659         foreach my $network (@PRIVATE_NETWORKS) {
 660                 run("$IPTABLES -A LOCATIONBLOCK -s $network -j RETURN");
 661         }
 662
 663         # Loop through all supported locations and
 664         # create iptables rules, if blocking for this country
 665         # is enabled.
 666         foreach my $location (@locations) {
 667                 if(exists $locationsettings{$location} && $locationsettings{$location} eq "on") {
 668                         run("$IPTABLES -A LOCATIONBLOCK -m geoip --src-cc $location -j DROP");
 669                 }
 670         }
 671 }
 672
 673 sub get_protocols {
 674         my $hash = shift;
 675         my $key = shift;
 676
 677         my $uses_source_ports = ($$hash{$key}[7] eq "ON");
 678         my $uses_services = ($$hash{$key}[11] eq "ON");
 679
 680         my @protocols = ();
 681
 682         # Rules which don't have source ports or services (like ICMP, ESP, ...).
 683         if (!$uses_source_ports && !$uses_services) {
 684                 push(@protocols, $$hash{$key}[8]);
 685
 686         # Rules which either use ports or services.
 687         } elsif ($uses_source_ports || $uses_services) {
 688                 # Check if service group or service
 689                 if ($$hash{$key}[14] eq 'cust_srv') {
 690                         push(@protocols, &fwlib::get_srv_prot($$hash{$key}[15]));
 691
 692                 } elsif($$hash{$key}[14] eq 'cust_srvgrp'){
 693                         my $protos = &fwlib::get_srvgrp_prot($$hash{$key}[15]);
 694                         push(@protocols, split(",", $protos));
 695
 696                 } else {
 697                         # Fetch the protocol for this rule.
 698                         my $protocol = lc($$hash{$key}[8]);
 699
 700                         # Fetch source and destination ports for this rule.
 701                         my $source_ports = $$hash{$key}[10];
 702                         my $destination_ports = $$hash{$key}[15];
 703
 704                         # Check if ports are set for protocols which do not support ports.
 705                         if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) {
 706                                 print_error("$protocol does not support ports");
 707                                 return ();
 708                         }
 709
 710                         push(@protocols, $protocol);
 711                 }
 712         }
 713
 714         # Remove all empty elements
 715         @protocols = map { $_ ? $_ : () } @protocols;
 716
 717         # If no protocol has been defined, we assume "all".
 718         if (!@protocols) {
 719                 push(@protocols, "all");
 720         }
 721
 722         # Make all protocol names lowercase.
 723         @protocols = map { lc } @protocols;
 724
 725         return @protocols;
 726 }
 727
 728 sub get_protocol_options {
 729         my $hash = shift;
 730         my $key  = shift;
 731         my $protocol = shift;
 732         my $nat_options_wanted = shift;
 733         my @options = ();
 734
 735         # Nothing to do if no protocol is specified.
 736         if ($protocol eq "all") {
 737                 return @options;
 738         } else {
 739                 push(@options, ("-p", $protocol));
 740         }
 741
 742         if ($protocol ~~ @PROTOCOLS_WITH_PORTS) {
 743                 # Process source ports.
 744                 my $use_src_ports = ($$hash{$key}[7] eq "ON");
 745                 my $src_ports     = $$hash{$key}[10];
 746
 747                 if ($use_src_ports && $src_ports) {
 748                         push(@options, &format_ports($src_ports, "src"));
 749                 }
 750
 751                 # Process destination ports.
 752                 my $use_dst_ports  = ($$hash{$key}[11] eq "ON");
 753                 my $use_dnat       = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat"));
 754
 755                 if ($use_dst_ports) {
 756                         my $dst_ports_mode = $$hash{$key}[14];
 757                         my $dst_ports      = $$hash{$key}[15];
 758
 759                         if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) {
 760                                 if ($nat_options_wanted && $use_dnat && $$hash{$key}[30]) {
 761                                         $dst_ports = $$hash{$key}[30];
 762                                 }
 763                                 push(@options, &format_ports($dst_ports, "dst"));
 764
 765                         } elsif ($dst_ports_mode eq "cust_srv") {
 766                                 if ($protocol eq "ICMP") {
 767                                         push(@options, ("--icmp-type", &fwlib::get_srv_port($dst_ports, 3, "ICMP")));
 768                                 } else {
 769                                         $dst_ports = &fwlib::get_srv_port($dst_ports, 1, uc($protocol));
 770                                         push(@options, &format_ports($dst_ports, "dst"));
 771                                 }
 772
 773                         } elsif ($dst_ports_mode eq "cust_srvgrp") {
 774                                 push(@options, &fwlib::get_srvgrp_port($dst_ports, uc($protocol)));
 775                         }
 776                 }
 777         }
 778
 779         # Check if a single ICMP type is selected.
 780         if ($protocol eq "icmp") {
 781                 my $icmp_type = $$hash{$key}[9];
 782
 783                 if (($icmp_type ne "All ICMP-Types") && $icmp_type) {
 784                         push(@options, ("--icmp-type", $icmp_type));
 785                 }
 786         }
 787
 788         return @options;
 789 }
 790
 791 sub format_ports {
 792         my $ports = shift;
 793         my $type = shift;
 794
 795         my $arg;
 796         if ($type eq "src") {
 797                 $arg = "--sport";
 798         } elsif ($type eq "dst") {
 799                 $arg = "--dport";
 800         }
 801
 802         my @options = ();
 803
 804         if ($ports =~ /\|/) {
 805                 $ports =~ s/\|/,/g;
 806                 push(@options, ("-m", "multiport"));
 807         }
 808
 809         if ($ports) {
 810                 push(@options, ($arg, $ports));
 811         }
 812
 813         return @options;
 814 }
 815
 816 sub get_dnat_target_port {
 817         my $hash = shift;
 818         my $key  = shift;
 819
 820         if ($$hash{$key}[14] eq "TGT_PORT") {
 821                 my $port = $$hash{$key}[15];
 822                 my $external_port = $$hash{$key}[30];
 823
 824                 if ($external_port && ($port ne $external_port)) {
 825                         return $$hash{$key}[15];
 826                 }
 827         }
 828 }
 829
 830 sub add_dnat_mangle_rules {
 831         my $nat_address = shift;
 832         my $interface = shift;
 833         my @options = @_;
 834
 835         my $mark = 0x01000000;
 836         foreach my $zone ("GREEN", "BLUE", "ORANGE") {
 837                 # Skip rule if not all required information exists.
 838                 next unless (exists $defaultNetworks{$zone . "_NETADDRESS"});
 839                 next unless (exists $defaultNetworks{$zone . "_NETMASK"});
 840
 841                 next if ($interface && $interface ne $defaultNetworks{$zone . "_DEV"});
 842
 843                 my @mangle_options = @options;
 844
 845                 my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"};
 846                 $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"};
 847
 848                 push(@mangle_options, ("-s", $netaddress, "-d", $nat_address));
 849                 push(@mangle_options, ("-j", "MARK", "--set-xmark", "$mark/$NAT_MASK"));
 850
 851                 run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options");
 852
 853                 $mark <<= 1;
 854         }
 855 }
 856
 857 sub make_log_limit_options {
 858         my @options = ("-m", "limit");
 859
 860         # Maybe we should get this from the configuration.
 861         my $limit = 10;
 862
 863         # We limit log messages to $limit messages per second.
 864         push(@options, ("--limit", "$limit/second"));
 865
 866         # And we allow bursts of 2x $limit.
 867         push(@options, ("--limit-burst", $limit * 2));
 868
 869         return @options;
 870 }
 871
 872 sub firewall_is_in_subnet {
 873         my $subnet = shift;
 874
 875         # ORANGE is missing here, because nothing may ever access
 876         # the firewall from this network.
 877         my $address = &fwlib::get_internal_firewall_ip_address($subnet, 0);
 878
 879         if ($address) {
 880                 return 1;
 881         }
 882
 883         return 0;
 884 }