config/firewall/firewall-lib.pl

   1 #!/usr/bin/perl
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2013 Alexander Marx <amarx@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 no warnings 'uninitialized';
  24
  25 package fwlib;
  26
  27 my %customnetwork=();
  28 my %customhost=();
  29 my %customgrp=();
  30 my %customgeoipgrp=();
  31 my %customservice=();
  32 my %customservicegrp=();
  33 my %ccdnet=();
  34 my %ccdhost=();
  35 my %ipsecconf=();
  36 my %ipsecsettings=();
  37 my %netsettings=();
  38 my %ovpnsettings=();
  39 my %aliases=();
  40
  41 require '/var/ipfire/general-functions.pl';
  42 require '${General::swroot}/geoip-locations.pl';
  43
  44 my $confignet           = "${General::swroot}/fwhosts/customnetworks";
  45 my $confighost          = "${General::swroot}/fwhosts/customhosts";
  46 my $configgrp           = "${General::swroot}/fwhosts/customgroups";
  47 my $configgeoipgrp      = "${General::swroot}/fwhosts/customgeoipgrp";
  48 my $configsrv           = "${General::swroot}/fwhosts/customservices";
  49 my $configsrvgrp        = "${General::swroot}/fwhosts/customservicegrp";
  50 my $configccdnet        = "${General::swroot}/ovpn/ccd.conf";
  51 my $configccdhost       = "${General::swroot}/ovpn/ovpnconfig";
  52 my $configipsec         = "${General::swroot}/vpn/config";
  53 my $configovpn          = "${General::swroot}/ovpn/settings";
  54 my $val;
  55 my $field;
  56 my $netsettings         = "${General::swroot}/ethernet/settings";
  57
  58 &General::readhash("/var/ipfire/ethernet/settings", \%netsettings);
  59 &General::readhash("${General::swroot}/ovpn/settings", \%ovpnsettings);
  60 &General::readhash("${General::swroot}/vpn/settings", \%ipsecsettings);
  61
  62 &General::readhasharray("$confignet", \%customnetwork);
  63 &General::readhasharray("$confighost", \%customhost);
  64 &General::readhasharray("$configgrp", \%customgrp);
  65 &General::readhasharray("$configgeoipgrp", \%customgeoipgrp);
  66 &General::readhasharray("$configccdnet", \%ccdnet);
  67 &General::readhasharray("$configccdhost", \%ccdhost);
  68 &General::readhasharray("$configipsec", \%ipsecconf);
  69 &General::readhasharray("$configsrv", \%customservice);
  70 &General::readhasharray("$configsrvgrp", \%customservicegrp);
  71 &General::get_aliases(\%aliases);
  72
  73 sub get_srv_prot
  74 {
  75         my $val=shift;
  76         foreach my $key (sort {$a <=> $b} keys %customservice){
  77                 if($customservice{$key}[0] eq $val){
  78                         if ($customservice{$key}[0] eq $val){
  79                                 return $customservice{$key}[2];
  80                         }
  81                 }
  82         }
  83 }
  84 sub get_srvgrp_prot
  85 {
  86         my $val=shift;
  87         my @ips=();
  88         my $tcp;
  89         my $udp;
  90         my $icmp;
  91         foreach my $key (sort {$a <=> $b} keys %customservicegrp){
  92                 if($customservicegrp{$key}[0] eq $val){
  93                         if (&get_srv_prot($customservicegrp{$key}[2]) eq 'TCP'){
  94                                 $tcp=1;
  95                         }elsif(&get_srv_prot($customservicegrp{$key}[2]) eq 'UDP'){
  96                                 $udp=1;
  97                         }elsif(&get_srv_prot($customservicegrp{$key}[2]) eq 'ICMP'){
  98                                 $icmp=1;
  99                         }else{
 100                                 #Protocols used in servicegroups
 101                                 push (@ips,$customservicegrp{$key}[2]);
 102                         }
 103                 }
 104         }
 105         if ($tcp eq '1'){push (@ips,'TCP');}
 106         if ($udp eq '1'){push (@ips,'UDP');}
 107         if ($icmp eq '1'){push (@ips,'ICMP');}
 108         my $back=join(",",@ips);
 109         return $back;
 110
 111 }
 112 sub get_srv_port
 113 {
 114         my $val=shift;
 115         my $field=shift;
 116         my $prot=shift;
 117         foreach my $key (sort {$a <=> $b} keys %customservice){
 118                 if($customservice{$key}[0] eq $val && $customservice{$key}[2] eq $prot){
 119                         return $customservice{$key}[$field];
 120                 }
 121         }
 122 }
 123 sub get_srvgrp_port
 124 {
 125         my $val=shift;
 126         my $prot=shift;
 127         my $back;
 128         my $value;
 129         my @ips=();
 130         foreach my $key (sort {$a <=> $b} keys %customservicegrp){
 131                 if($customservicegrp{$key}[0] eq $val){
 132                         if ($prot ne 'ICMP'){
 133                                 $value=&get_srv_port($customservicegrp{$key}[2],1,$prot);
 134                         }elsif ($prot eq 'ICMP'){
 135                                 $value=&get_srv_port($customservicegrp{$key}[2],3,$prot);
 136                         }
 137                         push (@ips,$value) if ($value ne '') ;
 138                 }
 139         }
 140         if($prot ne 'ICMP'){
 141                 if ($#ips gt 0){$back="-m multiport --dports ";}else{$back="--dport ";}
 142         }elsif ($prot eq 'ICMP'){
 143                 $back="--icmp-type ";
 144         }
 145
 146         $back.=join(",",@ips);
 147         return $back;
 148 }
 149 sub get_ipsec_net_ip
 150 {
 151         my $val=shift;
 152         my $field=shift;
 153         foreach my $key (sort {$a <=> $b} keys %ipsecconf){
 154                 #adapt $val to reflect real name without subnet (if rule with only one ipsec subnet is created)
 155                 my @tmpval = split (/\|/, $val);
 156                 $val = $tmpval[0];
 157                 if($ipsecconf{$key}[1] eq $val){
 158                         return $ipsecconf{$key}[$field];
 159                 }
 160         }
 161 }
 162 sub get_ipsec_host_ip
 163 {
 164         my $val=shift;
 165         my $field=shift;
 166         foreach my $key (sort {$a <=> $b} keys %ipsecconf){
 167                 if($ipsecconf{$key}[1] eq $val){
 168                         return $ipsecconf{$key}[$field];
 169                 }
 170         }
 171 }
 172 sub get_ovpn_n2n_ip
 173 {
 174         my $val=shift;
 175         my $field=shift;
 176         foreach my $key (sort {$a <=> $b} keys %ccdhost){
 177                 if($ccdhost{$key}[1] eq $val){
 178                         return $ccdhost{$key}[$field];
 179                 }
 180         }
 181 }
 182 sub get_ovpn_host_ip
 183 {
 184         my $val=shift;
 185         my $field=shift;
 186         foreach my $key (sort {$a <=> $b} keys %ccdhost){
 187                 if($ccdhost{$key}[1] eq $val){
 188                         return $ccdhost{$key}[$field];
 189                 }
 190         }
 191 }
 192 sub get_ovpn_net_ip
 193 {
 194
 195         my $val=shift;
 196         my $field=shift;
 197         foreach my $key (sort {$a <=> $b} keys %ccdnet){
 198                 if($ccdnet{$key}[0] eq $val){
 199                         return $ccdnet{$key}[$field];
 200                 }
 201         }
 202 }
 203 sub get_grp_ip
 204 {
 205         my $val=shift;
 206         my $src=shift;
 207         foreach my $key (sort {$a <=> $b} keys %customgrp){
 208                 if ($customgrp{$key}[0] eq $val){
 209                         &get_address($customgrp{$key}[3],$src);
 210                 }
 211         }
 212
 213 }
 214 sub get_std_net_ip
 215 {
 216         my $val=shift;
 217         my $con=shift;
 218         if ($val eq 'ALL'){
 219                 return "0.0.0.0/0.0.0.0";
 220         }elsif($val eq 'GREEN'){
 221                 return "$netsettings{'GREEN_NETADDRESS'}/$netsettings{'GREEN_NETMASK'}";
 222         }elsif($val eq 'ORANGE'){
 223                 return "$netsettings{'ORANGE_NETADDRESS'}/$netsettings{'ORANGE_NETMASK'}";
 224         }elsif($val eq 'BLUE'){
 225                 return "$netsettings{'BLUE_NETADDRESS'}/$netsettings{'BLUE_NETMASK'}";
 226         }elsif($val eq 'RED'){
 227                 return "0.0.0.0/0";
 228         }elsif($val =~ /OpenVPN/i){
 229                 return "$ovpnsettings{'DOVPN_SUBNET'}";
 230         }elsif($val =~ /IPsec/i){
 231                 return "$ipsecsettings{'RW_NET'}";
 232         }elsif($val eq 'IPFire'){
 233                 return ;
 234         }
 235 }
 236 sub get_interface
 237 {
 238         my $net=shift;
 239         if($net eq "$netsettings{'GREEN_NETADDRESS'}/$netsettings{'GREEN_NETMASK'}"){
 240                 return "$netsettings{'GREEN_DEV'}";
 241         }
 242         if($net eq "$netsettings{'ORANGE_NETADDRESS'}/$netsettings{'ORANGE_NETMASK'}"){
 243                 return "$netsettings{'ORANGE_DEV'}";
 244         }
 245         if($net eq "$netsettings{'BLUE_NETADDRESS'}/$netsettings{'BLUE_NETMASK'}"){
 246                 return "$netsettings{'BLUE_DEV'}";
 247         }
 248         if($net eq "0.0.0.0/0") {
 249                 return &get_external_interface();
 250         }
 251         return "";
 252 }
 253 sub get_net_ip
 254 {
 255         my $val=shift;
 256         foreach my $key (sort {$a <=> $b} keys %customnetwork){
 257                 if($customnetwork{$key}[0] eq $val){
 258                         return "$customnetwork{$key}[1]/$customnetwork{$key}[2]";
 259                 }
 260         }
 261 }
 262 sub get_host_ip
 263 {
 264         my $val=shift;
 265         my $src=shift;
 266         foreach my $key (sort {$a <=> $b} keys %customhost){
 267                 if($customhost{$key}[0] eq $val){
 268                         if ($customhost{$key}[1] eq 'mac' && $src eq 'src'){
 269                         return "-m mac --mac-source $customhost{$key}[2]";
 270                         }elsif($customhost{$key}[1] eq 'ip' && $src eq 'src'){
 271                                 return "$customhost{$key}[2]";
 272                         }elsif($customhost{$key}[1] eq 'ip' && $src eq 'tgt'){
 273                                 return "$customhost{$key}[2]";
 274                         }elsif($customhost{$key}[1] eq 'mac' && $src eq 'tgt'){
 275                                 return "none";
 276                         }
 277                 }
 278         }
 279 }
 280 sub get_addresses
 281 {
 282         my $hash = shift;
 283         my $key  = shift;
 284         my $type = shift;
 285
 286         my @addresses = ();
 287         my $addr_type;
 288         my $value;
 289         my $group_name;
 290
 291         if ($type eq "src") {
 292                 $addr_type = $$hash{$key}[3];
 293                 $value = $$hash{$key}[4];
 294
 295         } elsif ($type eq "tgt") {
 296                 $addr_type = $$hash{$key}[5];
 297                 $value = $$hash{$key}[6];
 298         }
 299
 300         if ($addr_type ~~ ["cust_grp_src", "cust_grp_tgt"]) {
 301                 foreach my $grp (sort {$a <=> $b} keys %customgrp) {
 302                         if ($customgrp{$grp}[0] eq $value) {
 303                                 my @address = &get_address($customgrp{$grp}[3], $customgrp{$grp}[2], $type);
 304
 305                                 if (@address) {
 306                                         push(@addresses, @address);
 307                                 }
 308                         }
 309                 }
 310         }elsif ($addr_type ~~ ["cust_geoip_src", "cust_geoip_tgt"] && $value =~ "group:") {
 311                 $value=substr($value,6);
 312                 foreach my $grp (sort {$a <=> $b} keys %customgeoipgrp) {
 313                         if ($customgeoipgrp{$grp}[0] eq $value) {
 314                                 my @address = &get_address($addr_type, $customgeoipgrp{$grp}[2], $type);
 315
 316                                 if (@address) {
 317                                         push(@addresses, @address);
 318                                 }
 319                         }
 320                 }
 321         } else {
 322                 my @address = &get_address($addr_type, $value, $type);
 323
 324                 if (@address) {
 325                         push(@addresses, @address);
 326                 }
 327         }
 328
 329         return @addresses;
 330 }
 331 sub get_address
 332 {
 333         my $key   = shift;
 334         my $value = shift;
 335         my $type  = shift;
 336
 337         my @ret = ();
 338
 339         # If the user manually typed an address, we just check if it is a MAC
 340         # address. Otherwise, we assume that it is an IP address.
 341         if ($key ~~ ["src_addr", "tgt_addr"]) {
 342                 if (&General::validmac($value)) {
 343                         push(@ret, ["-m mac --mac-source $value", ""]);
 344                 } else {
 345                         push(@ret, [$value, ""]);
 346                 }
 347
 348         # If a default network interface (GREEN, BLUE, etc.) is selected, we
 349         # try to get the corresponding address of the network.
 350         } elsif ($key ~~ ["std_net_src", "std_net_tgt", "Standard Network"]) {
 351                 my $external_interface = &get_external_interface();
 352
 353                 my $network_address = &get_std_net_ip($value, $external_interface);
 354
 355                 if ($network_address) {
 356                         my $interface = &get_interface($network_address);
 357                         push(@ret, [$network_address, $interface]);
 358                 }
 359
 360         # Custom networks.
 361         } elsif ($key ~~ ["cust_net_src", "cust_net_tgt", "Custom Network"]) {
 362                 my $network_address = &get_net_ip($value);
 363                 if ($network_address) {
 364                         push(@ret, [$network_address, ""]);
 365                 }
 366
 367         # Custom hosts.
 368         } elsif ($key ~~ ["cust_host_src", "cust_host_tgt", "Custom Host"]) {
 369                 my $host_address = &get_host_ip($value, $type);
 370                 if ($host_address) {
 371                         push(@ret, [$host_address, ""]);
 372                 }
 373
 374         # OpenVPN networks.
 375         } elsif ($key ~~ ["ovpn_net_src", "ovpn_net_tgt", "OpenVPN static network"]) {
 376                 my $network_address = &get_ovpn_net_ip($value, 1);
 377                 if ($network_address) {
 378                         push(@ret, [$network_address, ""]);
 379                 }
 380
 381         # OpenVPN hosts.
 382         } elsif ($key ~~ ["ovpn_host_src", "ovpn_host_tgt", "OpenVPN static host"]) {
 383                 my $host_address = &get_ovpn_host_ip($value, 33);
 384                 if ($host_address) {
 385                         push(@ret, [$host_address, ""]);
 386                 }
 387
 388         # OpenVPN N2N.
 389         } elsif ($key ~~ ["ovpn_n2n_src", "ovpn_n2n_tgt", "OpenVPN N-2-N"]) {
 390                 my $network_address = &get_ovpn_n2n_ip($value, 11);
 391                 if ($network_address) {
 392                         push(@ret, [$network_address, ""]);
 393                 }
 394
 395         # IPsec networks.
 396         } elsif ($key ~~ ["ipsec_net_src", "ipsec_net_tgt", "IpSec Network"]) {
 397                 #Check if we have multiple subnets and only want one of them
 398                 if ( $value =~ /\|/ ){
 399                         my @parts = split(/\|/, $value);
 400                         push(@ret, [$parts[1], ""]);
 401                 }else{
 402                         my $network_address = &get_ipsec_net_ip($value, 11);
 403                         my @nets = split(/\|/, $network_address);
 404                         foreach my $net (@nets) {
 405                                 push(@ret, [$net, ""]);
 406                         }
 407                 }
 408
 409         # The firewall's own IP addresses.
 410         } elsif ($key ~~ ["ipfire", "ipfire_src"]) {
 411                 # ALL
 412                 if ($value eq "ALL") {
 413                         push(@ret, ["0/0", ""]);
 414
 415                 # GREEN
 416                 } elsif ($value eq "GREEN") {
 417                         push(@ret, [$netsettings{"GREEN_ADDRESS"}, ""]);
 418
 419                 # BLUE
 420                 } elsif ($value eq "BLUE") {
 421                         push(@ret, [$netsettings{"BLUE_ADDRESS"}, ""]);
 422
 423                 # ORANGE
 424                 } elsif ($value eq "ORANGE") {
 425                         push(@ret, [$netsettings{"ORANGE_ADDRESS"}, ""]);
 426
 427                 # RED
 428                 } elsif ($value ~~ ["RED", "RED1"]) {
 429                         my $address = &get_external_address();
 430                         if ($address) {
 431                                 push(@ret, [$address, ""]);
 432                         }
 433
 434                 # Aliases
 435                 } else {
 436                         my $alias = &get_alias($value);
 437                         if ($alias) {
 438                                 push(@ret, [$alias, ""]);
 439                         }
 440                 }
 441
 442         # Handle rule options with GeoIP as source.
 443         } elsif ($key eq "cust_geoip_src") {
 444                 # Get external interface.
 445                 my $external_interface = &get_external_interface();
 446
 447                 push(@ret, ["-m geoip --src-cc $value", "$external_interface"]);
 448
 449         # Handle rule options with GeoIP as target.
 450         } elsif ($key eq "cust_geoip_tgt") {
 451                 # Get external interface.
 452                 my $external_interface = &get_external_interface();
 453
 454                 push(@ret, ["-m geoip --dst-cc $value", "$external_interface"]);
 455
 456         # If nothing was selected, we assume "any".
 457         } else {
 458                 push(@ret, ["0/0", ""]);
 459         }
 460
 461         return @ret;
 462 }
 463 sub get_external_interface()
 464 {
 465         open(IFACE, "/var/ipfire/red/iface") or return "";
 466         my $iface = <IFACE>;
 467         close(IFACE);
 468
 469         return $iface;
 470 }
 471 sub get_external_address()
 472 {
 473         open(ADDR, "/var/ipfire/red/local-ipaddress") or return "";
 474         my $address = <ADDR>;
 475         close(ADDR);
 476
 477         return $address;
 478 }
 479 sub get_alias
 480 {
 481         my $id = shift;
 482
 483         foreach my $alias (sort keys %aliases) {
 484                 if ($id eq $alias) {
 485                         return $aliases{$alias}{"IPT"};
 486                 }
 487         }
 488 }
 489
 490 sub get_nat_address {
 491         my $zone = shift;
 492         my $source = shift;
 493
 494         # Any static address of any zone.
 495         if ($zone eq "AUTO") {
 496                 if ($source && ($source !~ m/mac/i )) {
 497                         my $firewall_ip = &get_internal_firewall_ip_address($source, 1);
 498                         if ($firewall_ip) {
 499                                 return $firewall_ip;
 500                         }
 501
 502                         $firewall_ip = &get_matching_firewall_address($source, 1);
 503                         if ($firewall_ip) {
 504                                 return $firewall_ip;
 505                         }
 506                 }
 507
 508                 return &get_external_address();
 509
 510         } elsif ($zone eq "RED" || $zone eq "GREEN" || $zone eq "ORANGE" || $zone eq "BLUE") {
 511                 return $netsettings{$zone . "_ADDRESS"};
 512
 513         } elsif ($zone ~~ ["Default IP", "ALL"]) {
 514                 return &get_external_address();
 515
 516         } else {
 517                 my $alias = &get_alias($zone);
 518                 unless ($alias) {
 519                         $alias = &get_external_address();
 520                 }
 521                 return $alias;
 522         }
 523
 524         print_error("Could not find NAT address");
 525 }
 526
 527 sub get_internal_firewall_ip_addresses
 528 {
 529         my $use_orange = shift;
 530
 531         my @zones = ("GREEN", "BLUE");
 532         if ($use_orange) {
 533                 push(@zones, "ORANGE");
 534         }
 535
 536         my @addresses = ();
 537         for my $zone (@zones) {
 538                 next unless (exists $netsettings{$zone . "_ADDRESS"});
 539
 540                 my $zone_address = $netsettings{$zone . "_ADDRESS"};
 541                 push(@addresses, $zone_address);
 542         }
 543
 544         return @addresses;
 545 }
 546 sub get_matching_firewall_address
 547 {
 548         my $addr = shift;
 549         my $use_orange = shift;
 550
 551         my ($address, $netmask) = split("/", $addr);
 552
 553         my @zones = ("GREEN", "BLUE");
 554         if ($use_orange) {
 555                 push(@zones, "ORANGE");
 556         }
 557
 558         foreach my $zone (@zones) {
 559                 next unless (exists $netsettings{$zone . "_ADDRESS"});
 560
 561                 my $zone_subnet = $netsettings{$zone . "_NETADDRESS"};
 562                 my $zone_mask   = $netsettings{$zone . "_NETMASK"};
 563
 564                 if (&General::IpInSubnet($address, $zone_subnet, $zone_mask)) {
 565                         return $netsettings{$zone . "_ADDRESS"};
 566                 }
 567         }
 568
 569         return 0;
 570 }
 571 sub get_internal_firewall_ip_address
 572 {
 573         my $subnet = shift;
 574         my $use_orange = shift;
 575
 576         my ($net_address, $net_mask) = split("/", $subnet);
 577         if ((!$net_mask) || ($net_mask ~~ ["32", "255.255.255.255"])) {
 578                 return 0;
 579         }
 580
 581         # Convert net mask into correct format for &General::IpInSubnet().
 582         $net_mask = &General::iporsubtodec($net_mask);
 583
 584         my @addresses = &get_internal_firewall_ip_addresses($use_orange);
 585         foreach my $zone_address (@addresses) {
 586                 if (&General::IpInSubnet($zone_address, $net_address, $net_mask)) {
 587                         return $zone_address;
 588                 }
 589         }
 590
 591         return 0;
 592 }
 593
 594 sub get_geoip_locations() {
 595         return &GeoIP::get_geoip_locations();
 596 }
 597
 598 return 1;