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 my $IPSET = "ipset";
  35
  36 # iptables chains
  37 my $CHAIN_INPUT           = "INPUTFW";
  38 my $CHAIN_FORWARD         = "FORWARDFW";
  39 my $CHAIN_OUTPUT          = "OUTGOINGFW";
  40 my $CHAIN                 = $CHAIN_FORWARD;
  41 my $CHAIN_NAT_SOURCE      = "NAT_SOURCE";
  42 my $CHAIN_NAT_DESTINATION = "NAT_DESTINATION";
  43 my $CHAIN_MANGLE_NAT_DESTINATION_FIX = "NAT_DESTINATION";
  44 my @VALID_CHAINS          = ($CHAIN_INPUT, $CHAIN_FORWARD, $CHAIN_OUTPUT);
  45 my @ANY_ADDRESSES         = ("0.0.0.0/0.0.0.0", "0.0.0.0/0", "0/0");
  46
  47 my @PROTOCOLS = ("tcp", "udp", "icmp", "igmp", "ah", "esp", "gre", "ipv6", "ipip");
  48 my @PROTOCOLS_WITH_PORTS = ("tcp", "udp");
  49
  50 my @VALID_TARGETS = ("ACCEPT", "DROP", "REJECT");
  51
  52 my @PRIVATE_NETWORKS = (
  53         "10.0.0.0/8",
  54         "172.16.0.0/12",
  55         "192.168.0.0/16",
  56         "100.64.0.0/10",
  57 );
  58
  59 # MARK masks
  60 my $NAT_MASK = 0x0f000000;
  61
  62 my %fwdfwsettings=();
  63 my %fwoptions = ();
  64 my %defaultNetworks=();
  65 my %configfwdfw=();;
  66 my %customgrp=();
  67 my %configinputfw=();
  68 my %configoutgoingfw=();
  69 my %confignatfw=();
  70 my %locationsettings = (
  71         "LOCATIONBLOCK_ENABLED" => "off"
  72 );
  73
  74 my @p2ps=();
  75
  76 my $configfwdfw         = "${General::swroot}/firewall/config";
  77 my $configinput     = "${General::swroot}/firewall/input";
  78 my $configoutgoing  = "${General::swroot}/firewall/outgoing";
  79 my $p2pfile                     = "${General::swroot}/firewall/p2protocols";
  80 my $locationfile                = "${General::swroot}/firewall/locationblock";
  81 my $configgrp           = "${General::swroot}/fwhosts/customgroups";
  82 my $netsettings         = "${General::swroot}/ethernet/settings";
  83
  84 &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings);
  85 &General::readhash("${General::swroot}/optionsfw/settings", \%fwoptions);
  86 &General::readhash("$netsettings", \%defaultNetworks);
  87 &General::readhasharray($configfwdfw, \%configfwdfw);
  88 &General::readhasharray($configinput, \%configinputfw);
  89 &General::readhasharray($configoutgoing, \%configoutgoingfw);
  90 &General::readhasharray($configgrp, \%customgrp);
  91
  92 # Check if the location settings file exists
  93 if (-e "$locationfile") {
  94         # Read settings file
  95         &General::readhash("$locationfile", \%locationsettings);
  96 }
  97
  98 # Get all available locations.
  99 my @locations = &Location::Functions::get_locations();
 100
 101 my @log_limit_options = &make_log_limit_options();
 102
 103 my $POLICY_INPUT_ALLOWED   = 0;
 104 my $POLICY_FORWARD_ALLOWED = ($fwdfwsettings{"POLICY"} eq "MODE2");
 105 my $POLICY_OUTPUT_ALLOWED  = ($fwdfwsettings{"POLICY1"} eq "MODE2");
 106
 107 my $POLICY_INPUT_ACTION    = $fwoptions{"FWPOLICY2"};
 108 my $POLICY_FORWARD_ACTION  = $fwoptions{"FWPOLICY"};
 109 my $POLICY_OUTPUT_ACTION   = $fwoptions{"FWPOLICY1"};
 110
 111 # MAIN
 112 &main();
 113
 114 sub main {
 115         # Flush all chains.
 116         &flush();
 117
 118         # Destroy all existing ipsets.
 119         run("$IPSET destroy");
 120
 121         # Prepare firewall rules.
 122         if (! -z  "${General::swroot}/firewall/input"){
 123                 &buildrules(\%configinputfw);
 124         }
 125         if (! -z  "${General::swroot}/firewall/outgoing"){
 126                 &buildrules(\%configoutgoingfw);
 127         }
 128         if (! -z  "${General::swroot}/firewall/config"){
 129                 &buildrules(\%configfwdfw);
 130         }
 131
 132         # Load P2P block rules.
 133         &p2pblock();
 134
 135         # Load Location block rules.
 136         &locationblock();
 137
 138         # Reload firewall policy.
 139         run("/usr/sbin/firewall-policy");
 140
 141         #Reload firewall.local if present
 142         if ( -f '/etc/sysconfig/firewall.local'){
 143                 run("/etc/sysconfig/firewall.local reload");
 144         }
 145 }
 146
 147 sub run {
 148         # Executes or prints the given shell command.
 149         my $command = shift;
 150
 151         if ($DEBUG) {
 152                 print "$command\n";
 153         } else {
 154                 system "$command";
 155
 156                 if ($?) {
 157                         print_error("ERROR: $command");
 158                 }
 159         }
 160 }
 161
 162 sub print_error {
 163         my $message = shift;
 164
 165         print STDERR "$message\n";
 166 }
 167
 168 sub print_rule {
 169         my $hash = shift;
 170
 171         print "\nRULE:";
 172
 173         my $i = 0;
 174         foreach (@$hash) {
 175                 printf("  %2d: %s", $i++, $_);
 176         }
 177         print "\n";
 178 }
 179
 180 sub count_elements {
 181         my $hash = shift;
 182
 183         return scalar @$hash;
 184 }
 185
 186 sub flush {
 187         run("$IPTABLES -F $CHAIN_INPUT");
 188         run("$IPTABLES -F $CHAIN_FORWARD");
 189         run("$IPTABLES -F $CHAIN_OUTPUT");
 190         run("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE");
 191         run("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION");
 192         run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX");
 193
 194         # Flush LOCATIONBLOCK chain.
 195         run("$IPTABLES -F LOCATIONBLOCK");
 196 }
 197
 198 sub buildrules {
 199         my $hash = shift;
 200
 201         # Search for targets that need to be specially handled when adding
 202         # forwarding rules. Additional rules will automatically get inserted
 203         # into the INPUT/OUTPUT chains for these targets.
 204         my @special_input_targets = ();
 205         if (!$POLICY_FORWARD_ALLOWED) {
 206                 push(@special_input_targets, "ACCEPT");
 207         }
 208
 209         if ($POLICY_INPUT_ACTION eq "DROP") {
 210                 push(@special_input_targets, ("ACCEPT", "REJECT"));
 211         } elsif ($POLICY_INPUT_ACTION eq "REJECT") {
 212                 push(@special_input_targets, ("ACCEPT", "DROP"));
 213         }
 214
 215         my @special_output_targets = ();
 216         if ($POLICY_OUTPUT_ALLOWED) {
 217                 push(@special_output_targets, ("DROP", "REJECT"));
 218         } else {
 219                 push(@special_output_targets, "ACCEPT");
 220
 221                 if ($POLICY_OUTPUT_ACTION eq "DROP") {
 222                         push(@special_output_targets, ("ACCEPT", "REJECT"));
 223                 } elsif ($POLICY_OUTPUT_ACTION eq "REJECT") {
 224                         push(@special_output_targets, ("ACCEPT", "DROP"));
 225                 }
 226         }
 227
 228         foreach my $key (sort {$a <=> $b} keys %$hash) {
 229                 # Skip disabled rules.
 230                 next unless ($$hash{$key}[2] eq 'ON');
 231
 232                 # Count number of elements in this line
 233                 my $elements = &count_elements($$hash{$key});
 234
 235                 if ($DEBUG) {
 236                         print_rule($$hash{$key});
 237                 }
 238
 239                 # Check if the target is valid.
 240                 my $target = $$hash{$key}[0];
 241                 if (!$target ~~ @VALID_TARGETS) {
 242                         print_error("Invalid target '$target' for rule $key");
 243                         next;
 244                 }
 245
 246                 # Check if the chain is valid.
 247                 my $chain = $$hash{$key}[1];
 248                 if (!$chain ~~ @VALID_CHAINS) {
 249                         print_error("Invalid chain '$chain' in rule $key");
 250                         next;
 251                 }
 252
 253                 # Collect all sources.
 254                 my @sources = &fwlib::get_addresses($hash, $key, "src");
 255
 256                 # Collect all destinations.
 257                 my @destinations = &fwlib::get_addresses($hash, $key, "tgt");
 258
 259                 # True if the destination is the firewall itself.
 260                 my $destination_is_firewall = ($$hash{$key}[5] eq "ipfire");
 261
 262                 # Check if logging should be enabled.
 263                 my $LOG = ($$hash{$key}[17] eq 'ON');
 264
 265                 # Check if NAT is enabled and initialize variables, that we use for that.
 266                 my $NAT = ($$hash{$key}[28] eq 'ON');
 267                 my $NAT_MODE;
 268                 if ($NAT) {
 269                         $NAT_MODE = uc($$hash{$key}[31]);
 270                 }
 271
 272                 # Set up time constraints.
 273                 my @time_options = ();
 274                 if ($$hash{$key}[18] eq 'ON') {
 275                         push(@time_options, ("-m", "time"));
 276
 277                         # Select all days of the week this match is active.
 278                         my @weekdays = ();
 279                         if ($$hash{$key}[19] ne '') {
 280                                 push (@weekdays, "Mon");
 281                         }
 282                         if ($$hash{$key}[20] ne '') {
 283                                 push (@weekdays, "Tue");
 284                         }
 285                         if ($$hash{$key}[21] ne '') {
 286                                 push (@weekdays, "Wed");
 287                         }
 288                         if ($$hash{$key}[22] ne '') {
 289                                 push (@weekdays, "Thu");
 290                         }
 291                         if ($$hash{$key}[23] ne '') {
 292                                 push (@weekdays, "Fri");
 293                         }
 294                         if ($$hash{$key}[24] ne '') {
 295                                 push (@weekdays, "Sat");
 296                         }
 297                         if ($$hash{$key}[25] ne '') {
 298                                 push (@weekdays, "Sun");
 299                         }
 300                         if (@weekdays) {
 301                                 push(@time_options, ("--weekdays", join(",", @weekdays)));
 302                         }
 303
 304                         # Convert start time.
 305                         my $time_start = &format_time($$hash{$key}[26]);
 306                         if ($time_start) {
 307                                 push(@time_options, ("--timestart", $time_start));
 308                         }
 309
 310                         # Convert end time.
 311                         my $time_stop = &format_time($$hash{$key}[27]);
 312                         if ($time_stop) {
 313                                 push(@time_options, ("--timestop", $time_stop));
 314                         }
 315                 }
 316
 317                 # Concurrent connection limit
 318                 my @ratelimit_options = ();
 319
 320                 if (($elements ge 34) && ($$hash{$key}[32] eq 'ON')) {
 321                         my $conn_limit = $$hash{$key}[33];
 322
 323                         if ($conn_limit ge 1) {
 324                                 push(@ratelimit_options, ("-m", "connlimit"));
 325
 326                                 # Use the the entire source IP address
 327                                 push(@ratelimit_options, "--connlimit-saddr");
 328                                 push(@ratelimit_options, ("--connlimit-mask", "32"));
 329
 330                                 # Apply the limit
 331                                 push(@ratelimit_options, ("--connlimit-upto", $conn_limit));
 332                         }
 333                 }
 334
 335                 # Ratelimit
 336                 if (($elements ge 37) && ($$hash{$key}[34] eq 'ON')) {
 337                         my $rate_limit = "$$hash{$key}[35]/$$hash{$key}[36]";
 338
 339                         if ($rate_limit) {
 340                                 push(@ratelimit_options, ("-m", "limit"));
 341                                 push(@ratelimit_options, ("--limit", $rate_limit));
 342                         }
 343                 }
 344
 345                 # Check which protocols are used in this rule and so that we can
 346                 # later group rules by protocols.
 347                 my @protocols = &get_protocols($hash, $key);
 348                 if (!@protocols) {
 349                         print_error("Invalid protocol configuration for rule $key");
 350                         next;
 351                 }
 352
 353                 foreach my $protocol (@protocols) {
 354                         # Check if the given protocol is supported.
 355                         if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) {
 356                                 print_error("Protocol $protocol is not supported (rule $key)");
 357                                 next;
 358                         }
 359
 360                         # Prepare protocol options (like ICMP types, ports, etc...).
 361                         my @protocol_options = &get_protocol_options($hash, $key, $protocol, 0);
 362
 363                         # Check if this protocol knows ports.
 364                         my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS);
 365
 366                         foreach my $src (@sources) {
 367                                 # Skip invalid source.
 368                                 next unless (defined $src);
 369                                 next unless ($src);
 370
 371                                 # Sanitize source.
 372                                 my $source = @$src[0];
 373                                 if ($source ~~ @ANY_ADDRESSES) {
 374                                         $source = "";
 375                                 }
 376
 377                                 my $source_intf = @$src[1];
 378
 379                                 foreach my $dst (@destinations) {
 380                                         # Skip invalid rules.
 381                                         next unless (defined $dst);
 382                                         next if (!$dst || ($dst eq "none"));
 383
 384                                         # Sanitize destination.
 385                                         my $destination = @$dst[0];
 386                                         if ($destination ~~ @ANY_ADDRESSES) {
 387                                                 $destination = "";
 388                                         }
 389
 390                                         my $destination_intf = @$dst[1];
 391
 392                                         # Array with iptables arguments.
 393                                         my @options = ();
 394
 395                                         # Append protocol.
 396                                         if ($protocol ne "all") {
 397                                                 push(@options, @protocol_options);
 398                                         }
 399
 400                                         # Prepare source options.
 401                                         my @source_options = ();
 402                                         if ($source =~ /mac/) {
 403                                                 push(@source_options, $source);
 404                                         } elsif ($source =~ /-m geoip/) {
 405                                                 push(@source_options, $source);
 406                                         } elsif($source) {
 407                                                 push(@source_options, ("-s", $source));
 408                                         }
 409
 410                                         # Prepare destination options.
 411                                         my @destination_options = ();
 412                                         if ($destination =~ /-m geoip/) {
 413                                                 push(@destination_options,  $destination);
 414                                         } elsif ($destination) {
 415                                                 push(@destination_options, ("-d", $destination));
 416                                         }
 417
 418                                         # Add source and destination interface to the filter rules.
 419                                         # These are supposed to help filtering forged packets that originate
 420                                         # from BLUE with an IP address from GREEN for instance.
 421                                         my @source_intf_options = ();
 422                                         if ($source_intf) {
 423                                                 push(@source_intf_options, ("-i", $source_intf));
 424                                         }
 425
 426                                         my @destination_intf_options = ();
 427                                         if ($destination_intf) {
 428                                                 push(@destination_intf_options, ("-o", $destination_intf));
 429                                         }
 430
 431                                         # Add time constraint options.
 432                                         push(@options, @time_options);
 433
 434                                         # Add ratelimiting option
 435                                         push(@options, @ratelimit_options);
 436
 437                                         my $firewall_is_in_source_subnet = 1;
 438                                         if ($source) {
 439                                                 $firewall_is_in_source_subnet = &firewall_is_in_subnet($source);
 440                                         }
 441
 442                                         my $firewall_is_in_destination_subnet = 1;
 443                                         if ($destination) {
 444                                                 $firewall_is_in_destination_subnet = &firewall_is_in_subnet($destination);
 445                                         }
 446
 447                                         # Process NAT rules.
 448                                         if ($NAT) {
 449                                                 my $nat_address = &fwlib::get_nat_address($$hash{$key}[29], $source);
 450
 451                                                 # Skip NAT rules if the NAT address is unknown
 452                                                 # (i.e. no internet connection has been established, yet).
 453                                                 next unless ($nat_address);
 454
 455                                                 # Destination NAT
 456                                                 if ($NAT_MODE eq "DNAT") {
 457                                                         my @nat_options = ();
 458                                                         if ($protocol ne "all") {
 459                                                                 my @nat_protocol_options = &get_protocol_options($hash, $key, $protocol, 1);
 460                                                                 push(@nat_options, @nat_protocol_options);
 461                                                         }
 462
 463                                                         # Add time options.
 464                                                         push(@nat_options, @time_options);
 465
 466                                                         # Determine if a REDIRECT rule should be created.
 467                                                         my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports);
 468
 469                                                         # Make port-forwardings useable from the internal networks.
 470                                                         if (!$use_redirect) {
 471                                                                 my @internal_addresses = &fwlib::get_internal_firewall_ip_addresses(1);
 472                                                                 unless ($nat_address ~~ @internal_addresses) {
 473                                                                         &add_dnat_mangle_rules($nat_address, $source_intf, @nat_options);
 474                                                                 }
 475                                                         }
 476
 477                                                         # Add source options.
 478                                                         push(@nat_options, @source_options);
 479
 480                                                         # Add NAT address.
 481                                                         if (!$use_redirect) {
 482                                                                 push(@nat_options, ("-d", $nat_address));
 483                                                         }
 484
 485                                                         my $dnat_port;
 486                                                         if ($protocol_has_ports) {
 487                                                                 $dnat_port = &get_dnat_target_port($hash, $key);
 488                                                         }
 489
 490                                                         my @nat_action_options = ();
 491
 492                                                         # Use iptables REDIRECT
 493                                                         if ($use_redirect) {
 494                                                                 push(@nat_action_options, ("-j", "REDIRECT"));
 495
 496                                                                 # Redirect to specified port if one has given.
 497                                                                 if ($dnat_port) {
 498                                                                         push(@nat_action_options, ("--to-ports", $dnat_port));
 499                                                                 }
 500
 501                                                         # Use iptables DNAT
 502                                                         } else {
 503                                                                 if ($destination_is_firewall && !$destination) {
 504                                                                         $destination = &fwlib::get_external_address();
 505                                                                 }
 506                                                                 next unless ($destination);
 507
 508                                                                 my ($dnat_address, $dnat_mask) = split("/", $destination);
 509                                                                 @destination_options = ("-d", $dnat_address);
 510
 511                                                                 if ($protocol_has_ports) {
 512                                                                         my $dnat_port = &get_dnat_target_port($hash, $key);
 513
 514                                                                         if ($dnat_port) {
 515                                                                                 $dnat_address .= ":$dnat_port";
 516                                                                         }
 517                                                                 }
 518
 519                                                                 push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address));
 520                                                         }
 521
 522                                                         if ($LOG) {
 523                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '");
 524                                                         }
 525                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options");
 526
 527                                                 # Source NAT
 528                                                 } elsif ($NAT_MODE eq "SNAT") {
 529                                                         my @snat_options = ( "-m", "policy", "--dir", "out", "--pol", "none" );
 530                                                         my @nat_options = @options;
 531
 532                                                         # Get addresses for the configured firewall interfaces.
 533                                                         my @local_addresses = &fwlib::get_internal_firewall_ip_addresses(1);
 534
 535                                                         # Check if the nat_address is one of the local addresses.
 536                                                         foreach my $local_address (@local_addresses) {
 537                                                                 if ($nat_address eq $local_address) {
 538                                                                         # Clear SNAT options.
 539                                                                         @snat_options = ();
 540
 541                                                                         # Finish loop.
 542                                                                         last;
 543                                                                 }
 544                                                         }
 545
 546                                                         push(@nat_options, @destination_intf_options);
 547                                                         push(@nat_options, @source_options);
 548                                                         push(@nat_options, @destination_options);
 549
 550                                                         if ($LOG) {
 551                                                                 run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options @log_limit_options -j LOG --log-prefix 'SNAT '");
 552                                                         }
 553                                                         run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options -j SNAT --to-source $nat_address");
 554                                                 }
 555                                         }
 556
 557                                         push(@options, @source_options);
 558                                         push(@options, @destination_options);
 559
 560                                         # Insert firewall rule.
 561                                         if ($LOG) {
 562                                                 run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options @log_limit_options -j LOG --log-prefix '$chain '");
 563                                         }
 564                                         run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options -j $target");
 565
 566                                         # Handle forwarding rules and add corresponding rules for firewall access.
 567                                         if ($chain eq $CHAIN_FORWARD) {
 568                                                 # If the firewall is part of the destination subnet and access to the destination network
 569                                                 # is granted/forbidden for any network that the firewall itself is part of, we grant/forbid access
 570                                                 # for the firewall, too.
 571                                                 if ($firewall_is_in_destination_subnet && ($target ~~ @special_input_targets)) {
 572                                                         if ($LOG) {
 573                                                                 run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '");
 574                                                         }
 575                                                         run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options -j $target");
 576                                                 }
 577
 578                                                 # Likewise.
 579                                                 if ($firewall_is_in_source_subnet && ($target ~~ @special_output_targets)) {
 580                                                         if ($LOG) {
 581                                                                 run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_OUTPUT '");
 582                                                         }
 583                                                         run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options -j $target");
 584                                                 }
 585                                         }
 586                                 }
 587                         }
 588                 }
 589         }
 590 }
 591
 592 # Formats the given timestamp into the iptables format which is "hh:mm" UTC.
 593 sub format_time {
 594         my $val = shift;
 595
 596         # Convert the given time into minutes.
 597         my $minutes = &time_convert_to_minutes($val);
 598
 599         # Move the timestamp into UTC.
 600         $minutes += &time_utc_offset();
 601
 602         # Make sure $minutes is between 00:00 and 23:59.
 603         if ($minutes < 0) {
 604                 $minutes += 1440;
 605         }
 606
 607         if ($minutes > 1440) {
 608                 $minutes -= 1440;
 609         }
 610
 611         # Format as hh:mm.
 612         return sprintf("%02d:%02d", $minutes / 60, $minutes % 60);
 613 }
 614
 615 # Calculates the offsets in minutes from the local timezone to UTC.
 616 sub time_utc_offset {
 617         my @localtime = localtime(time);
 618         my @gmtime = gmtime(time);
 619
 620         return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60);
 621 }
 622
 623 # Takes a timestamp like "14:00" and converts it into minutes since midnight.
 624 sub time_convert_to_minutes {
 625         my ($hrs, $min) = split(":", shift);
 626
 627         return ($hrs * 60) + $min;
 628 }
 629
 630 sub p2pblock {
 631         open(FILE, "<$p2pfile") or die "Unable to read $p2pfile";
 632         my @protocols = ();
 633         foreach my $p2pentry (<FILE>) {
 634                 my @p2pline = split(/\;/, $p2pentry);
 635                 next unless ($p2pline[2] eq "off");
 636
 637                 push(@protocols, "--$p2pline[1]");
 638         }
 639         close(FILE);
 640
 641         run("$IPTABLES -F P2PBLOCK");
 642         if (@protocols) {
 643                 run("$IPTABLES -A P2PBLOCK -m ipp2p @protocols -j DROP");
 644         }
 645 }
 646
 647 sub locationblock {
 648         # The LOCATIONBLOCK chain now gets flushed by the flush() function.
 649
 650         # If location blocking is not enabled, we are finished here.
 651         if ($locationsettings{'LOCATIONBLOCK_ENABLED'} ne "on") {
 652                 # Exit submodule. Process remaining script.
 653                 return;
 654         }
 655
 656         # Only check the RED interface, which is ppp0 in case of RED_TYPE being
 657         # set to "PPPOE", and red0 in case of RED_TYPE not being empty otherwise.
 658         if ($defaultNetworks{'RED_TYPE'} eq "PPPOE") {
 659                 run("$IPTABLES -A LOCATIONBLOCK ! -i ppp0 -j RETURN");
 660         } elsif ($defaultNetworks{'RED_DEV'} ne "") {
 661                 run("$IPTABLES -A LOCATIONBLOCK ! -i $defaultNetworks{'RED_DEV'} -j RETURN");
 662         }
 663
 664         # Do not check any private address space
 665         foreach my $network (@PRIVATE_NETWORKS) {
 666                 run("$IPTABLES -A LOCATIONBLOCK -s $network -j RETURN");
 667         }
 668
 669         # Loop through all supported locations and
 670         # create iptables rules, if blocking for this country
 671         # is enabled.
 672         foreach my $location (@locations) {
 673                 if(exists $locationsettings{$location} && $locationsettings{$location} eq "on") {
 674                         # Call function to load the networks list for this country.
 675                         &ipset_restore($location);
 676
 677                         # Call iptables and create rule to use the loaded ipset list.
 678                         run("$IPTABLES -A LOCATIONBLOCK -m set --match-set CC_$location src -j DROP");
 679                 }
 680         }
 681 }
 682
 683 sub get_protocols {
 684         my $hash = shift;
 685         my $key = shift;
 686
 687         my $uses_source_ports = ($$hash{$key}[7] eq "ON");
 688         my $uses_services = ($$hash{$key}[11] eq "ON");
 689
 690         my @protocols = ();
 691
 692         # Rules which don't have source ports or services (like ICMP, ESP, ...).
 693         if (!$uses_source_ports && !$uses_services) {
 694                 push(@protocols, $$hash{$key}[8]);
 695
 696         # Rules which either use ports or services.
 697         } elsif ($uses_source_ports || $uses_services) {
 698                 # Check if service group or service
 699                 if ($$hash{$key}[14] eq 'cust_srv') {
 700                         push(@protocols, &fwlib::get_srv_prot($$hash{$key}[15]));
 701
 702                 } elsif($$hash{$key}[14] eq 'cust_srvgrp'){
 703                         my $protos = &fwlib::get_srvgrp_prot($$hash{$key}[15]);
 704                         push(@protocols, split(",", $protos));
 705
 706                 } else {
 707                         # Fetch the protocol for this rule.
 708                         my $protocol = lc($$hash{$key}[8]);
 709
 710                         # Fetch source and destination ports for this rule.
 711                         my $source_ports = $$hash{$key}[10];
 712                         my $destination_ports = $$hash{$key}[15];
 713
 714                         # Check if ports are set for protocols which do not support ports.
 715                         if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) {
 716                                 print_error("$protocol does not support ports");
 717                                 return ();
 718                         }
 719
 720                         push(@protocols, $protocol);
 721                 }
 722         }
 723
 724         # Remove all empty elements
 725         @protocols = map { $_ ? $_ : () } @protocols;
 726
 727         # If no protocol has been defined, we assume "all".
 728         if (!@protocols) {
 729                 push(@protocols, "all");
 730         }
 731
 732         # Make all protocol names lowercase.
 733         @protocols = map { lc } @protocols;
 734
 735         return @protocols;
 736 }
 737
 738 sub get_protocol_options {
 739         my $hash = shift;
 740         my $key  = shift;
 741         my $protocol = shift;
 742         my $nat_options_wanted = shift;
 743         my @options = ();
 744
 745         # Nothing to do if no protocol is specified.
 746         if ($protocol eq "all") {
 747                 return @options;
 748         } else {
 749                 push(@options, ("-p", $protocol));
 750         }
 751
 752         if ($protocol ~~ @PROTOCOLS_WITH_PORTS) {
 753                 # Process source ports.
 754                 my $use_src_ports = ($$hash{$key}[7] eq "ON");
 755                 my $src_ports     = $$hash{$key}[10];
 756
 757                 if ($use_src_ports && $src_ports) {
 758                         push(@options, &format_ports($src_ports, "src"));
 759                 }
 760
 761                 # Process destination ports.
 762                 my $use_dst_ports  = ($$hash{$key}[11] eq "ON");
 763                 my $use_dnat       = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat"));
 764
 765                 if ($use_dst_ports) {
 766                         my $dst_ports_mode = $$hash{$key}[14];
 767                         my $dst_ports      = $$hash{$key}[15];
 768
 769                         if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) {
 770                                 if ($nat_options_wanted && $use_dnat && $$hash{$key}[30]) {
 771                                         $dst_ports = $$hash{$key}[30];
 772                                 }
 773                                 push(@options, &format_ports($dst_ports, "dst"));
 774
 775                         } elsif ($dst_ports_mode eq "cust_srv") {
 776                                 if ($protocol eq "ICMP") {
 777                                         push(@options, ("--icmp-type", &fwlib::get_srv_port($dst_ports, 3, "ICMP")));
 778                                 } else {
 779                                         $dst_ports = &fwlib::get_srv_port($dst_ports, 1, uc($protocol));
 780                                         push(@options, &format_ports($dst_ports, "dst"));
 781                                 }
 782
 783                         } elsif ($dst_ports_mode eq "cust_srvgrp") {
 784                                 push(@options, &fwlib::get_srvgrp_port($dst_ports, uc($protocol)));
 785                         }
 786                 }
 787         }
 788
 789         # Check if a single ICMP type is selected.
 790         if ($protocol eq "icmp") {
 791                 my $icmp_type = $$hash{$key}[9];
 792
 793                 if (($icmp_type ne "All ICMP-Types") && $icmp_type) {
 794                         push(@options, ("--icmp-type", $icmp_type));
 795                 }
 796         }
 797
 798         return @options;
 799 }
 800
 801 sub format_ports {
 802         my $ports = shift;
 803         my $type = shift;
 804
 805         my $arg;
 806         if ($type eq "src") {
 807                 $arg = "--sport";
 808         } elsif ($type eq "dst") {
 809                 $arg = "--dport";
 810         }
 811
 812         my @options = ();
 813
 814         if ($ports =~ /\|/) {
 815                 $ports =~ s/\|/,/g;
 816                 push(@options, ("-m", "multiport"));
 817         }
 818
 819         if ($ports) {
 820                 push(@options, ($arg, $ports));
 821         }
 822
 823         return @options;
 824 }
 825
 826 sub get_dnat_target_port {
 827         my $hash = shift;
 828         my $key  = shift;
 829
 830         if ($$hash{$key}[14] eq "TGT_PORT") {
 831                 my $port = $$hash{$key}[15];
 832                 my $external_port = $$hash{$key}[30];
 833
 834                 if ($external_port && ($port ne $external_port)) {
 835                         return $$hash{$key}[15];
 836                 }
 837         }
 838 }
 839
 840 sub add_dnat_mangle_rules {
 841         my $nat_address = shift;
 842         my $interface = shift;
 843         my @options = @_;
 844
 845         my $mark = 0x01000000;
 846         foreach my $zone ("GREEN", "BLUE", "ORANGE") {
 847                 # Skip rule if not all required information exists.
 848                 next unless (exists $defaultNetworks{$zone . "_NETADDRESS"});
 849                 next unless (exists $defaultNetworks{$zone . "_NETMASK"});
 850
 851                 next if ($interface && $interface ne $defaultNetworks{$zone . "_DEV"});
 852
 853                 my @mangle_options = @options;
 854
 855                 my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"};
 856                 $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"};
 857
 858                 push(@mangle_options, ("-s", $netaddress, "-d", $nat_address));
 859                 push(@mangle_options, ("-j", "MARK", "--set-xmark", "$mark/$NAT_MASK"));
 860
 861                 run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options");
 862
 863                 $mark <<= 1;
 864         }
 865 }
 866
 867 sub make_log_limit_options {
 868         my @options = ("-m", "limit");
 869
 870         # Maybe we should get this from the configuration.
 871         my $limit = 10;
 872
 873         # We limit log messages to $limit messages per second.
 874         push(@options, ("--limit", "$limit/second"));
 875
 876         # And we allow bursts of 2x $limit.
 877         push(@options, ("--limit-burst", $limit * 2));
 878
 879         return @options;
 880 }
 881
 882 sub firewall_is_in_subnet {
 883         my $subnet = shift;
 884
 885         # ORANGE is missing here, because nothing may ever access
 886         # the firewall from this network.
 887         my $address = &fwlib::get_internal_firewall_ip_address($subnet, 0);
 888
 889         if ($address) {
 890                 return 1;
 891         }
 892
 893         return 0;
 894 }
 895
 896 sub ipset_restore ($) {
 897         my ($ccode) = @_;
 898
 899         # Run ipset and restore the list of the given country code.
 900         run("$IPSET restore < $Location::Functions::ipset_db_directory/$ccode.ipset4");
 901 }