PVE/Firewall.pm

   1 package PVE::Firewall;
   2
   3 use warnings;
   4 use strict;
   5 use Data::Dumper;
   6 use Digest::MD5;
   7 use PVE::Tools;
   8 use PVE::QemuServer;
   9 use File::Path;
  10 use IO::File;
  11 use Net::IP;
  12 use PVE::Tools qw(run_command lock_file);
  13
  14 use Data::Dumper;
  15
  16 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
  17
  18 my $macros;
  19
  20 # todo: implement some kind of MACROS, like shorewall /usr/share/shorewall/macro.*
  21 sub get_firewall_macros {
  22
  23     return $macros if $macros;
  24
  25     #foreach my $path (</usr/share/shorewall/macro.*>) {
  26     #  if ($path =~ m|/macro\.(\S+)$|) {
  27     #    $macros->{$1} = 1;
  28     #  }
  29     #}
  30
  31     $macros = {}; # fixme: implemet me
  32
  33     return $macros;
  34 }
  35
  36 my $etc_services;
  37
  38 sub get_etc_services {
  39
  40     return $etc_services if $etc_services;
  41
  42     my $filename = "/etc/services";
  43
  44     my $fh = IO::File->new($filename, O_RDONLY);
  45     if (!$fh) {
  46         warn "unable to read '$filename' - $!\n";
  47         return {};
  48     }
  49
  50     my $services = {};
  51
  52     while (my $line = <$fh>) {
  53         chomp ($line);
  54         next if $line =~m/^#/;
  55         next if ($line =~m/^\s*$/);
  56
  57         if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp).*$!) {
  58             $services->{byid}->{$2}->{name} = $1;
  59             $services->{byid}->{$2}->{$3} = 1;
  60             $services->{byname}->{$1} = $services->{byid}->{$2};
  61         }
  62     }
  63
  64     close($fh);
  65
  66     $etc_services = $services;
  67
  68
  69     return $etc_services;
  70 }
  71
  72 my $etc_protocols;
  73
  74 sub get_etc_protocols {
  75     return $etc_protocols if $etc_protocols;
  76
  77     my $filename = "/etc/protocols";
  78
  79     my $fh = IO::File->new($filename, O_RDONLY);
  80     if (!$fh) {
  81         warn "unable to read '$filename' - $!\n";
  82         return {};
  83     }
  84
  85     my $protocols = {};
  86
  87     while (my $line = <$fh>) {
  88         chomp ($line);
  89         next if $line =~m/^#/;
  90         next if ($line =~m/^\s*$/);
  91
  92         if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
  93             $protocols->{byid}->{$2}->{name} = $1;
  94             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
  95         }
  96     }
  97
  98     close($fh);
  99
 100     $etc_protocols = $protocols;
 101
 102     return $etc_protocols;
 103 }
 104
 105 sub parse_address_list {
 106     my ($str) = @_;
 107
 108     my $nbaor = 0;
 109     foreach my $aor (split(/,/, $str)) {
 110         if (!Net::IP->new($aor)) {
 111             my $err = Net::IP::Error();
 112             die "invalid IP address: $err\n";
 113         }else{
 114             $nbaor++;
 115         }
 116     }
 117     return $nbaor;
 118 }
 119
 120 sub parse_port_name_number_or_range {
 121     my ($str) = @_;
 122
 123     my $services = PVE::Firewall::get_etc_services();
 124     my $nbports = 0;
 125     foreach my $item (split(/,/, $str)) {
 126         my $portlist = "";
 127         foreach my $pon (split(':', $item, 2)) {
 128             if ($pon =~ m/^\d+$/){
 129                 die "invalid port '$pon'\n" if $pon < 0 && $pon > 65536;
 130             }else{
 131                 die "invalid port $services->{byname}->{$pon}\n" if !$services->{byname}->{$pon};
 132             }
 133             $nbports++;
 134         }
 135     }
 136
 137     return ($nbports);
 138 }
 139
 140 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
 141
 142 sub iptables {
 143     my ($cmd) = @_;
 144
 145     run_command("/sbin/iptables $cmd", outfunc => sub {}, errfunc => sub {});
 146 }
 147
 148 sub iptables_restore_cmdlist {
 149     my ($cmdlist) = @_;
 150
 151     run_command("/sbin/iptables-restore -n", input => $cmdlist);
 152 }
 153
 154 sub iptables_get_chains {
 155
 156     my $res = {};
 157
 158     # check what chains we want to track
 159     my $is_pvefw_chain = sub {
 160         my $name = shift;
 161
 162         return 1 if $name =~ m/^PVEFW-\S+$/;
 163
 164         return 1 if $name =~ m/^tap\d+i\d+-(:?IN|OUT)$/;
 165         return 1 if $name =~ m/^vmbr\d+-(:?IN|OUT)$/;
 166         return 1 if $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/;
 167
 168         return undef;
 169     };
 170
 171     my $table = '';
 172
 173     my $parser = sub {
 174         my $line = shift;
 175
 176         return if $line =~ m/^#/;
 177         return if $line =~ m/^\s*$/;
 178
 179         if ($line =~ m/^\*(\S+)$/) {
 180             $table = $1;
 181             return;
 182         }
 183
 184         return if $table ne 'filter';
 185
 186         if ($line =~ m/^:(\S+)\s/) {
 187             my $chain = $1;
 188             return if !&$is_pvefw_chain($chain);
 189             $res->{$chain} = "unknown";
 190         } elsif ($line =~ m/^-A\s+(\S+)\s.*--log-prefix\s+\"PVESIG:(\S+)\"/) {
 191             my ($chain, $sig) = ($1, $2);
 192             return if !&$is_pvefw_chain($chain);
 193             $res->{$chain} = $sig;
 194         } else {
 195             # simply ignore the rest
 196             return;
 197         }
 198     };
 199
 200     run_command("/sbin/iptables-save", outfunc => $parser);
 201
 202     return $res;
 203 }
 204
 205 sub iptables_chain_exist {
 206     my ($chain) = @_;
 207
 208     eval{
 209         iptables("-n --list $chain");
 210     };
 211     return undef if $@;
 212
 213     return 1;
 214 }
 215
 216 sub iptables_rule_exist {
 217     my ($rule) = @_;
 218
 219     eval{
 220         iptables("-C $rule");
 221     };
 222     return undef if $@;
 223
 224     return 1;
 225 }
 226
 227 sub ruleset_generate_rule {
 228     my ($ruleset, $chain, $rule) = @_;
 229
 230     my $cmd = '';
 231
 232     $cmd .= " -m iprange --src-range" if $rule->{nbsource} && $rule->{nbsource} > 1;
 233     $cmd .= " -s $rule->{source}" if $rule->{source};
 234     $cmd .= " -m iprange --dst-range" if $rule->{nbdest} && $rule->{nbdest} > 1;
 235     $cmd .= " -d $rule->{dest}" if $rule->{destination};
 236     $cmd .= " -p $rule->{proto}" if $rule->{proto};
 237     $cmd .= "  --match multiport" if $rule->{nbdport} && $rule->{nbdport} > 1;
 238     $cmd .= " --dport $rule->{dport}" if $rule->{dport};
 239     $cmd .= "  --match multiport" if $rule->{nbsport} && $rule->{nbsport} > 1;
 240     $cmd .= " --sport $rule->{sport}" if $rule->{sport};
 241     $cmd .= " -j $rule->{action}" if $rule->{action};
 242
 243     ruleset_addrule($ruleset, $chain, $cmd) if $cmd;
 244 }
 245
 246 sub ruleset_create_chain {
 247     my ($ruleset, $chain) = @_;
 248
 249     die "chain '$chain' already exists\n" if $ruleset->{$chain};
 250
 251     $ruleset->{$chain} = [];
 252 }
 253
 254 sub ruleset_chain_exist {
 255     my ($ruleset, $chain) = @_;
 256
 257     return $ruleset->{$chain} ? 1 : undef;
 258 }
 259
 260 sub ruleset_addrule {
 261    my ($ruleset, $chain, $rule) = @_;
 262
 263    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 264
 265    push @{$ruleset->{$chain}}, "-A $chain $rule";
 266 }
 267
 268 sub ruleset_insertrule {
 269    my ($ruleset, $chain, $rule) = @_;
 270
 271    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 272
 273    unshift @{$ruleset->{$chain}}, "-A $chain $rule";
 274 }
 275
 276 sub generate_bridge_chains {
 277     my ($ruleset, $bridge) = @_;
 278
 279     if (!ruleset_chain_exist($ruleset, "PVEFW-BRIDGE-IN")){
 280         ruleset_create_chain($ruleset, "PVEFW-BRIDGE-IN");
 281     }
 282
 283     if (!ruleset_chain_exist($ruleset, "PVEFW-BRIDGE-OUT")){
 284         ruleset_create_chain($ruleset, "PVEFW-BRIDGE-OUT");
 285     }
 286
 287     if (!ruleset_chain_exist($ruleset, "PVEFW-FORWARD")){
 288         ruleset_create_chain($ruleset, "PVEFW-FORWARD");
 289
 290         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 291         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-in --physdev-is-bridged -j PVEFW-BRIDGE-OUT");
 292         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-out --physdev-is-bridged -j PVEFW-BRIDGE-IN");
 293     }
 294
 295     if (!ruleset_chain_exist($ruleset, "$bridge-IN")) {
 296         ruleset_create_chain($ruleset, "$bridge-IN");
 297         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -j DROP");  # disable interbridge routing
 298         ruleset_addrule($ruleset, "PVEFW-BRIDGE-IN", "-j $bridge-IN");
 299         ruleset_addrule($ruleset, "$bridge-IN", "-j ACCEPT");
 300     }
 301
 302     if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) {
 303         ruleset_create_chain($ruleset, "$bridge-OUT");
 304         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -j DROP"); # disable interbridge routing
 305         ruleset_addrule($ruleset, "PVEFW-BRIDGE-OUT", "-j $bridge-OUT");
 306     }
 307 }
 308
 309 sub generate_tap_rules_direction {
 310     my ($ruleset, $iface, $netid, $macaddr, $rules, $bridge, $direction) = @_;
 311
 312     my $tapchain = "$iface-$direction";
 313
 314     ruleset_create_chain($ruleset, $tapchain);
 315
 316     ruleset_addrule($ruleset, $tapchain, "-m state --state INVALID -j DROP");
 317     ruleset_addrule($ruleset, $tapchain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 318
 319     if ($direction eq 'OUT' && defined($macaddr)) {
 320         ruleset_addrule($ruleset, $tapchain, "-m mac ! --mac-source $macaddr -j DROP");
 321     }
 322
 323     if ($rules) {
 324         foreach my $rule (@$rules) {
 325             next if $rule->{iface} && $rule->{iface} ne $netid;
 326             if($rule->{action}  =~ m/^(GROUP-(\S+))$/){
 327                 $rule->{action} .= "-$direction";
 328                 # generate empty group rule if don't exist
 329                 if(!ruleset_chain_exist($ruleset, $rule->{action})){
 330                     generate_group_rules($ruleset, $2);
 331                 }
 332             }
 333             # we go to vmbr-IN if accept in out rules
 334             $rule->{action} = "$bridge-IN" if $rule->{action} eq 'ACCEPT' && $direction eq 'OUT';
 335             ruleset_generate_rule($ruleset, $tapchain, $rule);
 336         }
 337     }
 338
 339     ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-dropped: \" --log-level 4");
 340     ruleset_addrule($ruleset, $tapchain, "-j DROP");
 341
 342     # plug the tap chain to bridge chain
 343     my $physdevdirection = $direction eq 'IN' ? "out" : "in";
 344     my $rule = "-m physdev --physdev-$physdevdirection $iface --physdev-is-bridged -j $tapchain";
 345     ruleset_insertrule($ruleset, "$bridge-$direction", $rule);
 346
 347     if ($direction eq 'OUT'){
 348         # add tap->host rules
 349         my $rule = "-m physdev --physdev-$physdevdirection $iface -j $tapchain";
 350         ruleset_addrule($ruleset, "PVEFW-INPUT", $rule);
 351     }
 352 }
 353
 354 sub enablehostfw {
 355     my ($ruleset) = @_;
 356
 357     my $filename = "/etc/pve/local/host.fw";
 358     my $fh = IO::File->new($filename, O_RDONLY);
 359     return if !$fh;
 360
 361     my $rules = parse_fw_rules($filename, $fh);
 362
 363     # host inbound firewall
 364     my $chain = "PVEFW-HOST-IN";
 365     ruleset_create_chain($ruleset, $chain);
 366
 367     ruleset_addrule($ruleset, $chain, "-m state --state INVALID -j DROP");
 368     ruleset_addrule($ruleset, $chain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 369     ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
 370     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 371     ruleset_addrule($ruleset, $chain, "-p udp -m state --state NEW -m multiport --dports 5404,5405 -j ACCEPT");
 372     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT");  #corosync
 373
 374     if ($rules->{in}) {
 375         foreach my $rule (@{$rules->{in}}) {
 376             # we use RETURN because we need to check also tap rules
 377             $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT';
 378             ruleset_generate_rule($ruleset, $chain, $rule);
 379         }
 380     }
 381
 382     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-IN dropped: \" --log-level 4");
 383     ruleset_addrule($ruleset, $chain, "-j DROP");
 384
 385     # host outbound firewall
 386     my $chain = "PVEFW-HOST-OUT";
 387     ruleset_create_chain($ruleset, $chain);
 388
 389     ruleset_addrule($ruleset, $chain, "-m state --state INVALID -j DROP");
 390     ruleset_addrule($ruleset, $chain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 391     ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
 392     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 393     ruleset_addrule($ruleset, $chain, "-p udp -m state --state NEW -m multiport --dports 5404,5405 -j ACCEPT");
 394     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
 395
 396     if ($rules->{out}) {
 397         foreach my $rule (@{$rules->{out}}) {
 398             # we use RETURN because we need to check also tap rules
 399             $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT';
 400             ruleset_generate_rule($ruleset, $chain, $rule);
 401         }
 402     }
 403
 404     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-OUT dropped: \" --log-level 4");
 405     ruleset_addrule($ruleset, $chain, "-j DROP");
 406
 407     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
 408     ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
 409 }
 410
 411 sub generate_group_rules {
 412     my ($ruleset, $group) = @_;
 413
 414     my $filename = "/etc/pve/firewall/groups.fw";
 415     my $fh = IO::File->new($filename, O_RDONLY);
 416     return if !$fh;
 417
 418     my $rules = parse_fw_rules($filename, $fh, $group);
 419
 420     my $chain = "GROUP-${group}-IN";
 421
 422     ruleset_create_chain($ruleset, $chain);
 423
 424     if ($rules->{in}) {
 425         foreach my $rule (@{$rules->{in}}) {
 426             ruleset_generate_rule($ruleset, $chain, $rule);
 427         }
 428     }
 429
 430     $chain = "GROUP-${group}-OUT";
 431
 432     ruleset_create_chain($ruleset, $chain);
 433
 434     if ($rules->{out}) {
 435         foreach my $rule (@{$rules->{out}}) {
 436             # we go the PVEFW-BRIDGE-IN because we need to check also other tap rules
 437             # (and group rules can be set on any bridge, so we can't go to VMBRXX-IN)
 438             $rule->{action} = 'PVEFW-BRIDGE-IN' if $rule->{action} eq 'ACCEPT';
 439             ruleset_generate_rule($rule, $chain, $rule);
 440         }
 441     }
 442 }
 443
 444 sub parse_fw_rules {
 445     my ($filename, $fh, $group) = @_;
 446
 447     my $section;
 448     my $securitygroup;
 449     my $securitygroupexist;
 450
 451     my $res = { in => [], out => [] };
 452
 453     my $macros = get_firewall_macros();
 454     my $protocols = get_etc_protocols();
 455
 456     while (defined(my $line = <$fh>)) {
 457         next if $line =~ m/^#/;
 458         next if $line =~ m/^\s*$/;
 459
 460         if ($line =~ m/^\[(in|out)(:(\S+))?\]\s*$/i) {
 461             $section = lc($1);
 462             $securitygroup = lc($3) if $3;
 463             $securitygroupexist = 1 if $securitygroup &&  $securitygroup eq $group;
 464             next;
 465         }
 466         next if !$section;
 467         next if $group && $securitygroup ne $group;
 468
 469         my ($action, $iface, $source, $dest, $proto, $dport, $sport) =
 470             split(/\s+/, $line);
 471
 472         if (!$action) {
 473             warn "skip incomplete line\n";
 474             next;
 475         }
 476
 477         my $service;
 478         if ($action =~ m/^(ACCEPT|DROP|REJECT|GROUP-(\S+))$/) {
 479             # OK
 480         } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
 481             ($service, $action) = ($1, $2);
 482             if (!$macros->{$service}) {
 483                 warn "unknown service '$service'\n";
 484                 next;
 485             }
 486         } else {
 487             warn "unknown action '$action'\n";
 488             next;
 489         }
 490
 491         $iface = undef if $iface && $iface eq '-';
 492         if ($iface && $iface !~ m/^(net0|net1|net2|net3|net4|net5)$/) {
 493             warn "unknown interface '$iface'\n";
 494             next;
 495         }
 496
 497         $proto = undef if $proto && $proto eq '-';
 498         if ($proto && !(defined($protocols->{byname}->{$proto}) ||
 499                         defined($protocols->{byid}->{$proto}))) {
 500             warn "unknown protokol '$proto'\n";
 501             next;
 502         }
 503
 504         $source = undef if $source && $source eq '-';
 505         $dest = undef if $dest && $dest eq '-';
 506
 507         $dport = undef if $dport && $dport eq '-';
 508         $sport = undef if $sport && $sport eq '-';
 509         my $nbdport = undef;
 510         my $nbsport = undef;
 511         my $nbsource = undef;
 512         my $nbdest = undef;
 513
 514         eval {
 515             $nbsource = parse_address_list($source) if $source;
 516             $nbdest = parse_address_list($dest) if $dest;
 517             $nbdport = parse_port_name_number_or_range($dport) if $dport;
 518             $nbsport = parse_port_name_number_or_range($sport) if $sport;
 519         };
 520         if (my $err = $@) {
 521             warn $err;
 522             next;
 523
 524         }
 525
 526
 527         my $rule = {
 528             action => $action,
 529             service => $service,
 530             iface => $iface,
 531             source => $source,
 532             dest => $dest,
 533             nbsource => $nbsource,
 534             nbdest => $nbdest,
 535             proto => $proto,
 536             dport => $dport,
 537             sport => $sport,
 538             nbdport => $nbdport,
 539             nbsport => $nbsport,
 540
 541         };
 542
 543         push @{$res->{$section}}, $rule;
 544     }
 545
 546     die "security group $group don't exist" if $group && !$securitygroupexist;
 547     return $res;
 548 }
 549
 550 sub run_locked {
 551     my ($code, @param) = @_;
 552
 553     my $timeout = 10;
 554
 555     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
 556
 557     die $@ if $@;
 558
 559     return $res;
 560 }
 561
 562 sub read_local_vm_config {
 563
 564     my $openvz = {};
 565
 566     my $qemu = {};
 567
 568     my $list = PVE::QemuServer::config_list();
 569
 570     foreach my $vmid (keys %$list) {
 571         my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
 572         if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
 573             $qemu->{$vmid} = $conf;
 574         }
 575     }
 576
 577     my $vmdata = { openvz => $openvz, qemu => $qemu };
 578
 579     return $vmdata;
 580 };
 581
 582 sub read_vm_firewall_rules {
 583     my ($vmdata) = @_;
 584     my $rules = {};
 585     foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
 586         my $filename = "/etc/pve/firewall/$vmid.fw";
 587         my $fh = IO::File->new($filename, O_RDONLY);
 588         next if !$fh;
 589
 590         $rules->{$vmid} = parse_fw_rules($filename, $fh);
 591     }
 592
 593     return $rules;
 594 }
 595
 596 sub compile {
 597     my $vmdata = read_local_vm_config();
 598     my $rules = read_vm_firewall_rules($vmdata);
 599
 600     #print Dumper($rules);
 601
 602     my $ruleset = {};
 603
 604     # setup host firewall rules
 605     ruleset_create_chain($ruleset, "PVEFW-INPUT");
 606     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
 607
 608     enablehostfw($ruleset);
 609
 610     # generate firewall rules for QEMU VMs
 611     foreach my $vmid (keys %{$vmdata->{qemu}}) {
 612         my $conf = $vmdata->{qemu}->{$vmid};
 613         next if !$rules->{$vmid};
 614
 615         foreach my $netid (keys %$conf) {
 616             next if $netid !~ m/^net(\d+)$/;
 617             my $net = PVE::QemuServer::parse_net($conf->{$netid});
 618             next if !$net;
 619             my $iface = "tap${vmid}i$1";
 620
 621             my $bridge = $net->{bridge};
 622             next if !$bridge; # fixme: ?
 623
 624             $bridge .= "v$net->{tag}" if $net->{tag};
 625
 626             generate_bridge_chains($ruleset, $bridge);
 627
 628             my $macaddr = $net->{macaddr};
 629             generate_tap_rules_direction($ruleset, $iface, $netid, $macaddr, $rules->{$vmid}->{in}, $bridge, 'IN');
 630             generate_tap_rules_direction($ruleset, $iface, $netid, $macaddr, $rules->{$vmid}->{out}, $bridge, 'OUT');
 631         }
 632     }
 633     return $ruleset;
 634 }
 635
 636 sub get_ruleset_status {
 637     my ($ruleset, $verbose) = @_;
 638
 639     my $active_chains = iptables_get_chains();
 640
 641     my $statushash = {};
 642
 643     foreach my $chain (sort keys %$ruleset) {
 644         my $digest = Digest::MD5->new();
 645         foreach my $cmd (@{$ruleset->{$chain}}) {
 646              $digest->add("$cmd\n");
 647         }
 648         my $sig = $digest->b64digest;
 649         $statushash->{$chain}->{sig} = $sig;
 650
 651         my $oldsig = $active_chains->{$chain};
 652         if (!defined($oldsig)) {
 653             $statushash->{$chain}->{action} = 'create';
 654         } else {
 655             if ($oldsig eq $sig) {
 656                 $statushash->{$chain}->{action} = 'exists';
 657             } else {
 658                 $statushash->{$chain}->{action} = 'update';
 659             }
 660         }
 661         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
 662         foreach my $cmd (@{$ruleset->{$chain}}) {
 663             print "\t$cmd\n" if $verbose;
 664         }
 665     }
 666
 667     foreach my $chain (sort keys %$active_chains) {
 668         if (!defined($ruleset->{$chain})) {
 669             my $sig = $active_chains->{$chain};
 670             $statushash->{$chain}->{action} = 'delete';
 671             $statushash->{$chain}->{sig} = $sig;
 672             print "delete $chain ($sig)\n" if $verbose;
 673         }
 674     }
 675
 676     return $statushash;
 677 }
 678
 679 sub print_ruleset {
 680     my ($ruleset) = @_;
 681
 682     get_ruleset_status($ruleset, 1);
 683 }
 684
 685 sub print_sig_rule {
 686     my ($chain, $sig) = @_;
 687
 688     # Note: This rule should never match! We just use this hack to store a SHA1 checksum
 689     # used to detect changes
 690     return "-A $chain -j LOG --log-prefix \"PVESIG:$sig\" -p tcp -s \"127.128.129.130\" --dport 1\n";
 691 }
 692
 693 sub compile_and_start {
 694     my ($verbose) = @_;
 695
 696     my $ruleset = compile();
 697
 698     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
 699
 700     my $statushash = get_ruleset_status($ruleset, $verbose);
 701
 702     # create missing chains first
 703     foreach my $chain (sort keys %$ruleset) {
 704         my $stat = $statushash->{$chain};
 705         die "internal error" if !$stat;
 706         next if $stat->{action} ne 'create';
 707
 708         $cmdlist .= ":$chain - [0:0]\n";
 709     }
 710
 711     my $rule = "INPUT -j PVEFW-INPUT";
 712     if (!PVE::Firewall::iptables_rule_exist($rule)) {
 713         $cmdlist .= "-A $rule\n";
 714     }
 715     $rule = "OUTPUT -j PVEFW-OUTPUT";
 716     if (!PVE::Firewall::iptables_rule_exist($rule)) {
 717         $cmdlist .= "-A $rule\n";
 718     }
 719
 720     $rule = "FORWARD -j PVEFW-FORWARD";
 721     if (!PVE::Firewall::iptables_rule_exist($rule)) {
 722         $cmdlist .= "-A $rule\n";
 723     }
 724
 725     foreach my $chain (sort keys %$ruleset) {
 726         my $stat = $statushash->{$chain};
 727         die "internal error" if !$stat;
 728
 729         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
 730             $cmdlist .= "-F $chain\n";
 731             foreach my $cmd (@{$ruleset->{$chain}}) {
 732                 $cmdlist .= "$cmd\n";
 733             }
 734             $cmdlist .= print_sig_rule($chain, $stat->{sig});
 735         } elsif ($stat->{action} eq 'delete') {
 736             $cmdlist .= "-F $chain\n";
 737             $cmdlist .= "-X $chain\n";
 738         } elsif ($stat->{action} eq 'exists') {
 739             # do nothing
 740         } else {
 741             die "internal error - unknown status '$stat->{action}'";
 742         }
 743     }
 744
 745     $cmdlist .= "COMMIT\n";
 746
 747     print $cmdlist if $verbose;
 748
 749     iptables_restore_cmdlist($cmdlist);
 750
 751     # test: re-read status and check if everything is up to date
 752     $statushash = get_ruleset_status($ruleset);
 753
 754     my $errors;
 755     foreach my $chain (sort keys %$ruleset) {
 756         my $stat = $statushash->{$chain};
 757         if ($stat->{action} ne 'exists') {
 758             warn "unable to update chain '$chain'\n";
 759             $errors = 1;
 760         }
 761     }
 762
 763     die "unable to apply firewall changes\n" if $errors;
 764 }
 765
 766 1;