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, $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, $tapchain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 318
 319     if ($rules) {
 320         foreach my $rule (@$rules) {
 321             next if $rule->{iface} && $rule->{iface} ne $netid;
 322             if($rule->{action}  =~ m/^(GROUP-(\S+))$/){
 323                 $rule->{action} .= "-$direction";
 324                 # generate empty group rule if don't exist
 325                 if(!ruleset_chain_exist($ruleset, $rule->{action})){
 326                     generate_group_rules($ruleset, $2);
 327                 }
 328             }
 329             # we go to vmbr-IN if accept in out rules
 330             $rule->{action} = "$bridge-IN" if $rule->{action} eq 'ACCEPT' && $direction eq 'OUT';
 331             ruleset_generate_rule($ruleset, $tapchain, $rule);
 332         }
 333     }
 334
 335     ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-dropped: \" --log-level 4");
 336     ruleset_addrule($ruleset, $tapchain, "-j DROP");
 337
 338     # plug the tap chain to bridge chain
 339     my $physdevdirection = $direction eq 'IN' ? "out" : "in";
 340     my $rule = "-m physdev --physdev-$physdevdirection $iface --physdev-is-bridged -j $tapchain";
 341     ruleset_insertrule($ruleset, "$bridge-$direction", $rule);
 342
 343     if ($direction eq 'OUT'){
 344         # add tap->host rules
 345         my $rule = "-m physdev --physdev-$physdevdirection $iface -j $tapchain";
 346         ruleset_addrule($ruleset, "PVEFW-INPUT", $rule);
 347     }
 348 }
 349
 350 sub enablehostfw {
 351     my ($ruleset) = @_;
 352
 353     my $filename = "/etc/pve/local/host.fw";
 354     my $fh = IO::File->new($filename, O_RDONLY);
 355     return if !$fh;
 356
 357     my $rules = parse_fw_rules($filename, $fh);
 358
 359     # host inbound firewall
 360     my $chain = "PVEFW-HOST-IN";
 361     ruleset_create_chain($ruleset, $chain);
 362
 363     ruleset_addrule($ruleset, $chain, "-m state --state INVALID -j DROP");
 364     ruleset_addrule($ruleset, $chain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 365     ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
 366     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 367     ruleset_addrule($ruleset, $chain, "-p udp -m state --state NEW -m multiport --dports 5404,5405 -j ACCEPT");
 368     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT");  #corosync
 369
 370     if ($rules->{in}) {
 371         foreach my $rule (@{$rules->{in}}) {
 372             # we use RETURN because we need to check also tap rules
 373             $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT';
 374             ruleset_generate_rule($ruleset, $chain, $rule);
 375         }
 376     }
 377
 378     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-IN dropped: \" --log-level 4");
 379     ruleset_addrule($ruleset, $chain, "-j DROP");
 380
 381     # host outbound firewall
 382     my $chain = "PVEFW-HOST-OUT";
 383     ruleset_create_chain($ruleset, $chain);
 384
 385     ruleset_addrule($ruleset, $chain, "-m state --state INVALID -j DROP");
 386     ruleset_addrule($ruleset, $chain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 387     ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
 388     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 389     ruleset_addrule($ruleset, $chain, "-p udp -m state --state NEW -m multiport --dports 5404,5405 -j ACCEPT");
 390     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
 391
 392     if ($rules->{out}) {
 393         foreach my $rule (@{$rules->{out}}) {
 394             # we use RETURN because we need to check also tap rules
 395             $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT';
 396             ruleset_generate_rule($ruleset, $chain, $rule);
 397         }
 398     }
 399
 400     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-OUT dropped: \" --log-level 4");
 401     ruleset_addrule($ruleset, $chain, "-j DROP");
 402
 403     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
 404     ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
 405 }
 406
 407 sub generate_group_rules {
 408     my ($ruleset, $group) = @_;
 409
 410     my $filename = "/etc/pve/firewall/groups.fw";
 411     my $fh = IO::File->new($filename, O_RDONLY);
 412     return if !$fh;
 413
 414     my $rules = parse_fw_rules($filename, $fh, $group);
 415
 416     my $chain = "GROUP-${group}-IN";
 417
 418     ruleset_create_chain($ruleset, $chain);
 419
 420     if ($rules->{in}) {
 421         foreach my $rule (@{$rules->{in}}) {
 422             ruleset_generate_rule($ruleset, $chain, $rule);
 423         }
 424     }
 425
 426     $chain = "GROUP-${group}-OUT";
 427
 428     ruleset_create_chain($ruleset, $chain);
 429
 430     if ($rules->{out}) {
 431         foreach my $rule (@{$rules->{out}}) {
 432             # we go the PVEFW-BRIDGE-IN because we need to check also other tap rules
 433             # (and group rules can be set on any bridge, so we can't go to VMBRXX-IN)
 434             $rule->{action} = 'PVEFW-BRIDGE-IN' if $rule->{action} eq 'ACCEPT';
 435             ruleset_generate_rule($rule, $chain, $rule);
 436         }
 437     }
 438 }
 439
 440 sub parse_fw_rules {
 441     my ($filename, $fh, $group) = @_;
 442
 443     my $section;
 444     my $securitygroup;
 445     my $securitygroupexist;
 446
 447     my $res = { in => [], out => [] };
 448
 449     my $macros = get_firewall_macros();
 450     my $protocols = get_etc_protocols();
 451
 452     while (defined(my $line = <$fh>)) {
 453         next if $line =~ m/^#/;
 454         next if $line =~ m/^\s*$/;
 455
 456         if ($line =~ m/^\[(in|out)(:(\S+))?\]\s*$/i) {
 457             $section = lc($1);
 458             $securitygroup = lc($3) if $3;
 459             $securitygroupexist = 1 if $securitygroup &&  $securitygroup eq $group;
 460             next;
 461         }
 462         next if !$section;
 463         next if $group && $securitygroup ne $group;
 464
 465         my ($action, $iface, $source, $dest, $proto, $dport, $sport) =
 466             split(/\s+/, $line);
 467
 468         if (!$action) {
 469             warn "skip incomplete line\n";
 470             next;
 471         }
 472
 473         my $service;
 474         if ($action =~ m/^(ACCEPT|DROP|REJECT|GROUP-(\S+))$/) {
 475             # OK
 476         } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
 477             ($service, $action) = ($1, $2);
 478             if (!$macros->{$service}) {
 479                 warn "unknown service '$service'\n";
 480                 next;
 481             }
 482         } else {
 483             warn "unknown action '$action'\n";
 484             next;
 485         }
 486
 487         $iface = undef if $iface && $iface eq '-';
 488         if ($iface && $iface !~ m/^(net0|net1|net2|net3|net4|net5)$/) {
 489             warn "unknown interface '$iface'\n";
 490             next;
 491         }
 492
 493         $proto = undef if $proto && $proto eq '-';
 494         if ($proto && !(defined($protocols->{byname}->{$proto}) ||
 495                         defined($protocols->{byid}->{$proto}))) {
 496             warn "unknown protokol '$proto'\n";
 497             next;
 498         }
 499
 500         $source = undef if $source && $source eq '-';
 501         $dest = undef if $dest && $dest eq '-';
 502
 503         $dport = undef if $dport && $dport eq '-';
 504         $sport = undef if $sport && $sport eq '-';
 505         my $nbdport = undef;
 506         my $nbsport = undef;
 507         my $nbsource = undef;
 508         my $nbdest = undef;
 509
 510         eval {
 511             $nbsource = parse_address_list($source) if $source;
 512             $nbdest = parse_address_list($dest) if $dest;
 513             $nbdport = parse_port_name_number_or_range($dport) if $dport;
 514             $nbsport = parse_port_name_number_or_range($sport) if $sport;
 515         };
 516         if (my $err = $@) {
 517             warn $err;
 518             next;
 519
 520         }
 521
 522
 523         my $rule = {
 524             action => $action,
 525             service => $service,
 526             iface => $iface,
 527             source => $source,
 528             dest => $dest,
 529             nbsource => $nbsource,
 530             nbdest => $nbdest,
 531             proto => $proto,
 532             dport => $dport,
 533             sport => $sport,
 534             nbdport => $nbdport,
 535             nbsport => $nbsport,
 536
 537         };
 538
 539         push @{$res->{$section}}, $rule;
 540     }
 541
 542     die "security group $group don't exist" if $group && !$securitygroupexist;
 543     return $res;
 544 }
 545
 546 sub run_locked {
 547     my ($code, @param) = @_;
 548
 549     my $timeout = 10;
 550
 551     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
 552
 553     die $@ if $@;
 554
 555     return $res;
 556 }
 557
 558 sub read_local_vm_config {
 559
 560     my $openvz = {};
 561
 562     my $qemu = {};
 563
 564     my $list = PVE::QemuServer::config_list();
 565
 566     foreach my $vmid (keys %$list) {
 567         my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
 568         if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
 569             $qemu->{$vmid} = $conf;
 570         }
 571     }
 572
 573     my $vmdata = { openvz => $openvz, qemu => $qemu };
 574
 575     return $vmdata;
 576 };
 577
 578 sub read_vm_firewall_rules {
 579     my ($vmdata) = @_;
 580     my $rules = {};
 581     foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
 582         my $filename = "/etc/pve/firewall/$vmid.fw";
 583         my $fh = IO::File->new($filename, O_RDONLY);
 584         next if !$fh;
 585
 586         $rules->{$vmid} = parse_fw_rules($filename, $fh);
 587     }
 588
 589     return $rules;
 590 }
 591
 592 sub compile {
 593     my $vmdata = read_local_vm_config();
 594     my $rules = read_vm_firewall_rules($vmdata);
 595
 596     #print Dumper($rules);
 597
 598     my $ruleset = {};
 599
 600     # setup host firewall rules
 601     ruleset_create_chain($ruleset, "PVEFW-INPUT");
 602     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
 603
 604     enablehostfw($ruleset);
 605
 606     # generate firewall rules for QEMU VMs
 607     foreach my $vmid (keys %{$vmdata->{qemu}}) {
 608         my $conf = $vmdata->{qemu}->{$vmid};
 609         next if !$rules->{$vmid};
 610
 611         foreach my $netid (keys %$conf) {
 612             next if $netid !~ m/^net(\d+)$/;
 613             my $net = PVE::QemuServer::parse_net($conf->{$netid});
 614             next if !$net;
 615             my $iface = "tap${vmid}i$1";
 616
 617             my $bridge = $net->{bridge};
 618             next if !$bridge; # fixme: ?
 619
 620             $bridge .= "v$net->{tag}" if $net->{tag};
 621
 622             generate_bridge_chains($ruleset, $bridge);
 623
 624             generate_tap_rules_direction($ruleset, $iface, $netid, $rules->{$vmid}->{in}, $bridge, 'IN');
 625             generate_tap_rules_direction($ruleset, $iface, $netid, $rules->{$vmid}->{out}, $bridge, 'OUT');
 626         }
 627     }
 628     return $ruleset;
 629 }
 630
 631 sub get_ruleset_status {
 632     my ($ruleset, $verbose) = @_;
 633
 634     my $active_chains = iptables_get_chains();
 635
 636     my $statushash = {};
 637
 638     foreach my $chain (sort keys %$ruleset) {
 639         my $digest = Digest::MD5->new();
 640         foreach my $cmd (@{$ruleset->{$chain}}) {
 641              $digest->add("$cmd\n");
 642         }
 643         my $sig = $digest->b64digest;
 644         $statushash->{$chain}->{sig} = $sig;
 645
 646         my $oldsig = $active_chains->{$chain};
 647         if (!defined($oldsig)) {
 648             $statushash->{$chain}->{action} = 'create';
 649         } else {
 650             if ($oldsig eq $sig) {
 651                 $statushash->{$chain}->{action} = 'exists';
 652             } else {
 653                 $statushash->{$chain}->{action} = 'update';
 654             }
 655         }
 656         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
 657         foreach my $cmd (@{$ruleset->{$chain}}) {
 658             print "\t$cmd\n" if $verbose;
 659         }
 660     }
 661
 662     foreach my $chain (sort keys %$active_chains) {
 663         if (!defined($ruleset->{$chain})) {
 664             my $sig = $active_chains->{$chain};
 665             $statushash->{$chain}->{action} = 'delete';
 666             $statushash->{$chain}->{sig} = $sig;
 667             print "delete $chain ($sig)\n" if $verbose;
 668         }
 669     }
 670
 671     return $statushash;
 672 }
 673
 674 sub print_ruleset {
 675     my ($ruleset) = @_;
 676
 677     get_ruleset_status($ruleset, 1);
 678 }
 679
 680 sub print_sig_rule {
 681     my ($chain, $sig) = @_;
 682
 683     # Note: This rule should never match! We just use this hack to store a SHA1 checksum
 684     # used to detect changes
 685     return "-A $chain -j LOG --log-prefix \"PVESIG:$sig\" -p tcp -s \"127.128.129.130\" --dport 1\n";
 686 }
 687
 688 sub compile_and_start {
 689     my ($verbose) = @_;
 690
 691     my $ruleset = compile();
 692
 693     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
 694
 695     my $statushash = get_ruleset_status($ruleset, $verbose);
 696
 697     # create missing chains first
 698     foreach my $chain (sort keys %$ruleset) {
 699         my $stat = $statushash->{$chain};
 700         die "internal error" if !$stat;
 701         next if $stat->{action} ne 'create';
 702
 703         $cmdlist .= ":$chain - [0:0]\n";
 704     }
 705
 706     my $rule = "INPUT -j PVEFW-INPUT";
 707     if (!PVE::Firewall::iptables_rule_exist($rule)) {
 708         $cmdlist .= "-A $rule\n";
 709     }
 710     $rule = "OUTPUT -j PVEFW-OUTPUT";
 711     if (!PVE::Firewall::iptables_rule_exist($rule)) {
 712         $cmdlist .= "-A $rule\n";
 713     }
 714
 715     $rule = "FORWARD -j PVEFW-FORWARD";
 716     if (!PVE::Firewall::iptables_rule_exist($rule)) {
 717         $cmdlist .= "-A $rule\n";
 718     }
 719
 720     foreach my $chain (sort keys %$ruleset) {
 721         my $stat = $statushash->{$chain};
 722         die "internal error" if !$stat;
 723
 724         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
 725             $cmdlist .= "-F $chain\n";
 726             foreach my $cmd (@{$ruleset->{$chain}}) {
 727                 $cmdlist .= "$cmd\n";
 728             }
 729             $cmdlist .= print_sig_rule($chain, $stat->{sig});
 730         } elsif ($stat->{action} eq 'delete') {
 731             $cmdlist .= "-F $chain\n";
 732             $cmdlist .= "-X $chain\n";
 733         } elsif ($stat->{action} eq 'exists') {
 734             # do nothing
 735         } else {
 736             die "internal error - unknown status '$stat->{action}'";
 737         }
 738     }
 739
 740     $cmdlist .= "COMMIT\n";
 741
 742     print $cmdlist if $verbose;
 743
 744     iptables_restore_cmdlist($cmdlist);
 745
 746     # test: re-read status and check if everything is up to date
 747     $statushash = get_ruleset_status($ruleset);
 748
 749     my $errors;
 750     foreach my $chain (sort keys %$ruleset) {
 751         my $stat = $statushash->{$chain};
 752         if ($stat->{action} ne 'exists') {
 753             warn "unable to update chain '$chain'\n";
 754             $errors = 1;
 755         }
 756     }
 757
 758     die "unable to apply firewall changes\n" if $errors;
 759 }
 760
 761 1;