PVE/Firewall.pm

   1 package PVE::Firewall;
   2
   3 use warnings;
   4 use strict;
   5 use Data::Dumper;
   6 use Digest::SHA;
   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 $bridge_firewall_enabled = 0;
 141
 142 sub enable_bridge_firewall {
 143
 144     return if $bridge_firewall_enabled; # only once
 145
 146     system("echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables");
 147     system("echo 1 > /proc/sys/net/bridge/bridge-nf-call-ip6tables");
 148
 149     $bridge_firewall_enabled = 1;
 150 }
 151
 152 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
 153
 154 sub iptables {
 155     my ($cmd) = @_;
 156
 157     run_command("/sbin/iptables $cmd", outfunc => sub {}, errfunc => sub {});
 158 }
 159
 160 sub iptables_restore_cmdlist {
 161     my ($cmdlist) = @_;
 162
 163     run_command("/sbin/iptables-restore -n", input => $cmdlist);
 164 }
 165
 166 sub iptables_get_chains {
 167
 168     my $res = {};
 169
 170     # check what chains we want to track
 171     my $is_pvefw_chain = sub {
 172         my $name = shift;
 173
 174         return 1 if $name =~ m/^PVEFW-\S+$/;
 175
 176         return 1 if $name =~ m/^tap\d+i\d+-(:?IN|OUT)$/;
 177         return 1 if $name =~ m/^vmbr\d+-(:?IN|OUT)$/;
 178         return 1 if $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/;
 179
 180         return undef;
 181     };
 182
 183     my $table = '';
 184
 185     my $parser = sub {
 186         my $line = shift;
 187
 188         return if $line =~ m/^#/;
 189         return if $line =~ m/^\s*$/;
 190
 191         if ($line =~ m/^\*(\S+)$/) {
 192             $table = $1;
 193             return;
 194         }
 195
 196         return if $table ne 'filter';
 197
 198         if ($line =~ m/^:(\S+)\s/) {
 199             my $chain = $1;
 200             return if !&$is_pvefw_chain($chain);
 201             $res->{$chain} = "unknown";
 202         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
 203             my ($chain, $sig) = ($1, $2);
 204             return if !&$is_pvefw_chain($chain);
 205             $res->{$chain} = $sig;
 206         } else {
 207             # simply ignore the rest
 208             return;
 209         }
 210     };
 211
 212     run_command("/sbin/iptables-save", outfunc => $parser);
 213
 214     return $res;
 215 }
 216
 217 sub iptables_chain_exist {
 218     my ($chain) = @_;
 219
 220     eval{
 221         iptables("-n --list $chain");
 222     };
 223     return undef if $@;
 224
 225     return 1;
 226 }
 227
 228 sub iptables_rule_exist {
 229     my ($rule) = @_;
 230
 231     eval{
 232         iptables("-C $rule");
 233     };
 234     return undef if $@;
 235
 236     return 1;
 237 }
 238
 239 sub ruleset_generate_rule {
 240     my ($ruleset, $chain, $rule) = @_;
 241
 242     my $cmd = '';
 243
 244     $cmd .= " -m iprange --src-range" if $rule->{nbsource} && $rule->{nbsource} > 1;
 245     $cmd .= " -s $rule->{source}" if $rule->{source};
 246     $cmd .= " -m iprange --dst-range" if $rule->{nbdest} && $rule->{nbdest} > 1;
 247     $cmd .= " -d $rule->{dest}" if $rule->{destination};
 248     $cmd .= " -p $rule->{proto}" if $rule->{proto};
 249     $cmd .= "  --match multiport" if $rule->{nbdport} && $rule->{nbdport} > 1;
 250     $cmd .= " --dport $rule->{dport}" if $rule->{dport};
 251     $cmd .= "  --match multiport" if $rule->{nbsport} && $rule->{nbsport} > 1;
 252     $cmd .= " --sport $rule->{sport}" if $rule->{sport};
 253     $cmd .= " -j $rule->{action}" if $rule->{action};
 254
 255     ruleset_addrule($ruleset, $chain, $cmd) if $cmd;
 256 }
 257
 258 sub ruleset_create_chain {
 259     my ($ruleset, $chain) = @_;
 260
 261     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
 262
 263     die "chain '$chain' already exists\n" if $ruleset->{$chain};
 264
 265     $ruleset->{$chain} = [];
 266 }
 267
 268 sub ruleset_chain_exist {
 269     my ($ruleset, $chain) = @_;
 270
 271     return $ruleset->{$chain} ? 1 : undef;
 272 }
 273
 274 sub ruleset_addrule {
 275    my ($ruleset, $chain, $rule) = @_;
 276
 277    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 278
 279    push @{$ruleset->{$chain}}, "-A $chain $rule";
 280 }
 281
 282 sub ruleset_insertrule {
 283    my ($ruleset, $chain, $rule) = @_;
 284
 285    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 286
 287    unshift @{$ruleset->{$chain}}, "-A $chain $rule";
 288 }
 289
 290 sub generate_bridge_chains {
 291     my ($ruleset, $bridge) = @_;
 292
 293     if (!ruleset_chain_exist($ruleset, "PVEFW-BRIDGE-IN")){
 294         ruleset_create_chain($ruleset, "PVEFW-BRIDGE-IN");
 295     }
 296
 297     if (!ruleset_chain_exist($ruleset, "PVEFW-BRIDGE-OUT")){
 298         ruleset_create_chain($ruleset, "PVEFW-BRIDGE-OUT");
 299     }
 300
 301     if (!ruleset_chain_exist($ruleset, "PVEFW-FORWARD")){
 302         ruleset_create_chain($ruleset, "PVEFW-FORWARD");
 303
 304         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 305         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-in --physdev-is-bridged -j PVEFW-BRIDGE-OUT");
 306         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-out --physdev-is-bridged -j PVEFW-BRIDGE-IN");
 307     }
 308
 309     if (!ruleset_chain_exist($ruleset, "$bridge-IN")) {
 310         ruleset_create_chain($ruleset, "$bridge-IN");
 311         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -j DROP");  # disable interbridge routing
 312         ruleset_addrule($ruleset, "PVEFW-BRIDGE-IN", "-j $bridge-IN");
 313         ruleset_addrule($ruleset, "$bridge-IN", "-j ACCEPT");
 314     }
 315
 316     if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) {
 317         ruleset_create_chain($ruleset, "$bridge-OUT");
 318         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -j DROP"); # disable interbridge routing
 319         ruleset_addrule($ruleset, "PVEFW-BRIDGE-OUT", "-j $bridge-OUT");
 320     }
 321 }
 322
 323 sub generate_tap_rules_direction {
 324     my ($ruleset, $iface, $netid, $macaddr, $rules, $bridge, $direction) = @_;
 325
 326     my $tapchain = "$iface-$direction";
 327
 328     ruleset_create_chain($ruleset, $tapchain);
 329
 330     ruleset_addrule($ruleset, $tapchain, "-m state --state INVALID -j DROP");
 331     ruleset_addrule($ruleset, $tapchain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 332
 333     if ($direction eq 'OUT' && defined($macaddr)) {
 334         ruleset_addrule($ruleset, $tapchain, "-m mac ! --mac-source $macaddr -j DROP");
 335     }
 336
 337     if ($rules) {
 338         foreach my $rule (@$rules) {
 339             next if $rule->{iface} && $rule->{iface} ne $netid;
 340             if($rule->{action}  =~ m/^(GROUP-(\S+))$/){
 341                 $rule->{action} .= "-$direction";
 342                 # generate empty group rule if don't exist
 343                 if(!ruleset_chain_exist($ruleset, $rule->{action})){
 344                     generate_group_rules($ruleset, $2);
 345                 }
 346             }
 347             # we go to vmbr-IN if accept in out rules
 348             $rule->{action} = "$bridge-IN" if $rule->{action} eq 'ACCEPT' && $direction eq 'OUT';
 349             ruleset_generate_rule($ruleset, $tapchain, $rule);
 350         }
 351     }
 352
 353     ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-dropped: \" --log-level 4");
 354     ruleset_addrule($ruleset, $tapchain, "-j DROP");
 355
 356     # plug the tap chain to bridge chain
 357     my $physdevdirection = $direction eq 'IN' ? "out" : "in";
 358     my $rule = "-m physdev --physdev-$physdevdirection $iface --physdev-is-bridged -j $tapchain";
 359     ruleset_insertrule($ruleset, "$bridge-$direction", $rule);
 360
 361     if ($direction eq 'OUT'){
 362         # add tap->host rules
 363         my $rule = "-m physdev --physdev-$physdevdirection $iface -j $tapchain";
 364         ruleset_addrule($ruleset, "PVEFW-INPUT", $rule);
 365     }
 366 }
 367
 368 sub enablehostfw {
 369     my ($ruleset) = @_;
 370
 371     my $filename = "/etc/pve/local/host.fw";
 372     my $fh = IO::File->new($filename, O_RDONLY);
 373     return if !$fh;
 374
 375     my $rules = parse_fw_rules($filename, $fh);
 376
 377     # host inbound firewall
 378     my $chain = "PVEFW-HOST-IN";
 379     ruleset_create_chain($ruleset, $chain);
 380
 381     ruleset_addrule($ruleset, $chain, "-m state --state INVALID -j DROP");
 382     ruleset_addrule($ruleset, $chain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 383     ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
 384     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 385     ruleset_addrule($ruleset, $chain, "-p udp -m state --state NEW -m multiport --dports 5404,5405 -j ACCEPT");
 386     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT");  #corosync
 387
 388     if ($rules->{in}) {
 389         foreach my $rule (@{$rules->{in}}) {
 390             # we use RETURN because we need to check also tap rules
 391             $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT';
 392             ruleset_generate_rule($ruleset, $chain, $rule);
 393         }
 394     }
 395
 396     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-IN dropped: \" --log-level 4");
 397     ruleset_addrule($ruleset, $chain, "-j DROP");
 398
 399     # host outbound firewall
 400     $chain = "PVEFW-HOST-OUT";
 401     ruleset_create_chain($ruleset, $chain);
 402
 403     ruleset_addrule($ruleset, $chain, "-m state --state INVALID -j DROP");
 404     ruleset_addrule($ruleset, $chain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 405     ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
 406     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 407     ruleset_addrule($ruleset, $chain, "-p udp -m state --state NEW -m multiport --dports 5404,5405 -j ACCEPT");
 408     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
 409
 410     if ($rules->{out}) {
 411         foreach my $rule (@{$rules->{out}}) {
 412             # we use RETURN because we need to check also tap rules
 413             $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT';
 414             ruleset_generate_rule($ruleset, $chain, $rule);
 415         }
 416     }
 417
 418     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-OUT dropped: \" --log-level 4");
 419     ruleset_addrule($ruleset, $chain, "-j DROP");
 420
 421     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
 422     ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
 423 }
 424
 425 sub generate_group_rules {
 426     my ($ruleset, $group) = @_;
 427
 428     my $filename = "/etc/pve/firewall/groups.fw";
 429     my $fh = IO::File->new($filename, O_RDONLY);
 430     return if !$fh;
 431
 432     my $rules = parse_fw_rules($filename, $fh, $group);
 433
 434     my $chain = "GROUP-${group}-IN";
 435
 436     ruleset_create_chain($ruleset, $chain);
 437
 438     if ($rules->{in}) {
 439         foreach my $rule (@{$rules->{in}}) {
 440             ruleset_generate_rule($ruleset, $chain, $rule);
 441         }
 442     }
 443
 444     $chain = "GROUP-${group}-OUT";
 445
 446     ruleset_create_chain($ruleset, $chain);
 447
 448     if ($rules->{out}) {
 449         foreach my $rule (@{$rules->{out}}) {
 450             # we go the PVEFW-BRIDGE-IN because we need to check also other tap rules
 451             # (and group rules can be set on any bridge, so we can't go to VMBRXX-IN)
 452             $rule->{action} = 'PVEFW-BRIDGE-IN' if $rule->{action} eq 'ACCEPT';
 453             ruleset_generate_rule($ruleset, $chain, $rule);
 454         }
 455     }
 456 }
 457
 458 sub parse_fw_rules {
 459     my ($filename, $fh, $group) = @_;
 460
 461     my $section;
 462     my $securitygroup;
 463     my $securitygroupexist;
 464
 465     my $res = { in => [], out => [] };
 466
 467     my $macros = get_firewall_macros();
 468     my $protocols = get_etc_protocols();
 469
 470     while (defined(my $line = <$fh>)) {
 471         next if $line =~ m/^#/;
 472         next if $line =~ m/^\s*$/;
 473
 474         if ($line =~ m/^\[(in|out)(:(\S+))?\]\s*$/i) {
 475             $section = lc($1);
 476             $securitygroup = lc($3) if $3;
 477             $securitygroupexist = 1 if $securitygroup &&  $securitygroup eq $group;
 478             next;
 479         }
 480         next if !$section;
 481         next if $group && $securitygroup ne $group;
 482
 483         my ($action, $iface, $source, $dest, $proto, $dport, $sport) =
 484             split(/\s+/, $line);
 485
 486         if (!$action) {
 487             warn "skip incomplete line\n";
 488             next;
 489         }
 490
 491         my $service;
 492         if ($action =~ m/^(ACCEPT|DROP|REJECT|GROUP-(\S+))$/) {
 493             # OK
 494         } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
 495             ($service, $action) = ($1, $2);
 496             if (!$macros->{$service}) {
 497                 warn "unknown service '$service'\n";
 498                 next;
 499             }
 500         } else {
 501             warn "unknown action '$action'\n";
 502             next;
 503         }
 504
 505         $iface = undef if $iface && $iface eq '-';
 506         if ($iface && $iface !~ m/^(net0|net1|net2|net3|net4|net5)$/) {
 507             warn "unknown interface '$iface'\n";
 508             next;
 509         }
 510
 511         $proto = undef if $proto && $proto eq '-';
 512         if ($proto && !(defined($protocols->{byname}->{$proto}) ||
 513                         defined($protocols->{byid}->{$proto}))) {
 514             warn "unknown protokol '$proto'\n";
 515             next;
 516         }
 517
 518         $source = undef if $source && $source eq '-';
 519         $dest = undef if $dest && $dest eq '-';
 520
 521         $dport = undef if $dport && $dport eq '-';
 522         $sport = undef if $sport && $sport eq '-';
 523         my $nbdport = undef;
 524         my $nbsport = undef;
 525         my $nbsource = undef;
 526         my $nbdest = undef;
 527
 528         eval {
 529             $nbsource = parse_address_list($source) if $source;
 530             $nbdest = parse_address_list($dest) if $dest;
 531             $nbdport = parse_port_name_number_or_range($dport) if $dport;
 532             $nbsport = parse_port_name_number_or_range($sport) if $sport;
 533         };
 534         if (my $err = $@) {
 535             warn $err;
 536             next;
 537
 538         }
 539
 540
 541         my $rule = {
 542             action => $action,
 543             service => $service,
 544             iface => $iface,
 545             source => $source,
 546             dest => $dest,
 547             nbsource => $nbsource,
 548             nbdest => $nbdest,
 549             proto => $proto,
 550             dport => $dport,
 551             sport => $sport,
 552             nbdport => $nbdport,
 553             nbsport => $nbsport,
 554
 555         };
 556
 557         push @{$res->{$section}}, $rule;
 558     }
 559
 560     die "security group $group don't exist" if $group && !$securitygroupexist;
 561     return $res;
 562 }
 563
 564 sub run_locked {
 565     my ($code, @param) = @_;
 566
 567     my $timeout = 10;
 568
 569     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
 570
 571     die $@ if $@;
 572
 573     return $res;
 574 }
 575
 576 sub read_local_vm_config {
 577
 578     my $openvz = {};
 579
 580     my $qemu = {};
 581
 582     my $list = PVE::QemuServer::config_list();
 583
 584     foreach my $vmid (keys %$list) {
 585         my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
 586         if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
 587             $qemu->{$vmid} = $conf;
 588         }
 589     }
 590
 591     my $vmdata = { openvz => $openvz, qemu => $qemu };
 592
 593     return $vmdata;
 594 };
 595
 596 sub read_vm_firewall_rules {
 597     my ($vmdata) = @_;
 598     my $rules = {};
 599     foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
 600         my $filename = "/etc/pve/firewall/$vmid.fw";
 601         my $fh = IO::File->new($filename, O_RDONLY);
 602         next if !$fh;
 603
 604         $rules->{$vmid} = parse_fw_rules($filename, $fh);
 605     }
 606
 607     return $rules;
 608 }
 609
 610 sub compile {
 611     my $vmdata = read_local_vm_config();
 612     my $rules = read_vm_firewall_rules($vmdata);
 613
 614     #print Dumper($rules);
 615
 616     my $ruleset = {};
 617
 618     # setup host firewall rules
 619     ruleset_create_chain($ruleset, "PVEFW-INPUT");
 620     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
 621
 622     enablehostfw($ruleset);
 623
 624     # generate firewall rules for QEMU VMs
 625     foreach my $vmid (keys %{$vmdata->{qemu}}) {
 626         my $conf = $vmdata->{qemu}->{$vmid};
 627         next if !$rules->{$vmid};
 628
 629         foreach my $netid (keys %$conf) {
 630             next if $netid !~ m/^net(\d+)$/;
 631             my $net = PVE::QemuServer::parse_net($conf->{$netid});
 632             next if !$net;
 633             my $iface = "tap${vmid}i$1";
 634
 635             my $bridge = $net->{bridge};
 636             next if !$bridge; # fixme: ?
 637
 638             $bridge .= "v$net->{tag}" if $net->{tag};
 639
 640             generate_bridge_chains($ruleset, $bridge);
 641
 642             my $macaddr = $net->{macaddr};
 643             generate_tap_rules_direction($ruleset, $iface, $netid, $macaddr, $rules->{$vmid}->{in}, $bridge, 'IN');
 644             generate_tap_rules_direction($ruleset, $iface, $netid, $macaddr, $rules->{$vmid}->{out}, $bridge, 'OUT');
 645         }
 646     }
 647     return $ruleset;
 648 }
 649
 650 sub get_ruleset_status {
 651     my ($ruleset, $verbose) = @_;
 652
 653     my $active_chains = iptables_get_chains();
 654
 655     my $statushash = {};
 656
 657     foreach my $chain (sort keys %$ruleset) {
 658         my $digest = Digest::SHA->new('sha1');
 659         foreach my $cmd (@{$ruleset->{$chain}}) {
 660              $digest->add("$cmd\n");
 661         }
 662         my $sig = $digest->b64digest;
 663         $statushash->{$chain}->{sig} = $sig;
 664
 665         my $oldsig = $active_chains->{$chain};
 666         if (!defined($oldsig)) {
 667             $statushash->{$chain}->{action} = 'create';
 668         } else {
 669             if ($oldsig eq $sig) {
 670                 $statushash->{$chain}->{action} = 'exists';
 671             } else {
 672                 $statushash->{$chain}->{action} = 'update';
 673             }
 674         }
 675         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
 676         foreach my $cmd (@{$ruleset->{$chain}}) {
 677             print "\t$cmd\n" if $verbose;
 678         }
 679     }
 680
 681     foreach my $chain (sort keys %$active_chains) {
 682         if (!defined($ruleset->{$chain})) {
 683             my $sig = $active_chains->{$chain};
 684             $statushash->{$chain}->{action} = 'delete';
 685             $statushash->{$chain}->{sig} = $sig;
 686             print "delete $chain ($sig)\n" if $verbose;
 687         }
 688     }
 689
 690     return $statushash;
 691 }
 692
 693 sub print_ruleset {
 694     my ($ruleset) = @_;
 695
 696     get_ruleset_status($ruleset, 1);
 697 }
 698
 699 sub print_sig_rule {
 700     my ($chain, $sig) = @_;
 701
 702     # We just use this to store a SHA1 checksum used to detect changes
 703     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
 704 }
 705
 706 sub apply_ruleset {
 707     my ($ruleset, $verbose) = @_;
 708
 709     enable_bridge_firewall();
 710
 711     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
 712
 713     my $statushash = get_ruleset_status($ruleset, $verbose);
 714
 715     # create missing chains first
 716     foreach my $chain (sort keys %$ruleset) {
 717         my $stat = $statushash->{$chain};
 718         die "internal error" if !$stat;
 719         next if $stat->{action} ne 'create';
 720
 721         $cmdlist .= ":$chain - [0:0]\n";
 722     }
 723
 724     my $rule = "INPUT -j PVEFW-INPUT";
 725     if (!PVE::Firewall::iptables_rule_exist($rule)) {
 726         $cmdlist .= "-A $rule\n";
 727     }
 728     $rule = "OUTPUT -j PVEFW-OUTPUT";
 729     if (!PVE::Firewall::iptables_rule_exist($rule)) {
 730         $cmdlist .= "-A $rule\n";
 731     }
 732
 733     $rule = "FORWARD -j PVEFW-FORWARD";
 734     if (!PVE::Firewall::iptables_rule_exist($rule)) {
 735         $cmdlist .= "-A $rule\n";
 736     }
 737
 738     foreach my $chain (sort keys %$ruleset) {
 739         my $stat = $statushash->{$chain};
 740         die "internal error" if !$stat;
 741
 742         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
 743             $cmdlist .= "-F $chain\n";
 744             foreach my $cmd (@{$ruleset->{$chain}}) {
 745                 $cmdlist .= "$cmd\n";
 746             }
 747             $cmdlist .= print_sig_rule($chain, $stat->{sig});
 748         } elsif ($stat->{action} eq 'delete') {
 749             die "internal error"; # this should not happen
 750         } elsif ($stat->{action} eq 'exists') {
 751             # do nothing
 752         } else {
 753             die "internal error - unknown status '$stat->{action}'";
 754         }
 755     }
 756
 757     foreach my $chain (keys %$statushash) {
 758         next if $statushash->{$chain}->{action} ne 'delete';
 759         $cmdlist .= "-F $chain\n";
 760     }
 761     foreach my $chain (keys %$statushash) {
 762         next if $statushash->{$chain}->{action} ne 'delete';
 763         $cmdlist .= "-X $chain\n";
 764     }
 765
 766     $cmdlist .= "COMMIT\n";
 767
 768     print $cmdlist if $verbose;
 769
 770     iptables_restore_cmdlist($cmdlist);
 771
 772     # test: re-read status and check if everything is up to date
 773     $statushash = get_ruleset_status($ruleset);
 774
 775     my $errors;
 776     foreach my $chain (sort keys %$ruleset) {
 777         my $stat = $statushash->{$chain};
 778         if ($stat->{action} ne 'exists') {
 779             warn "unable to update chain '$chain'\n";
 780             $errors = 1;
 781         }
 782     }
 783
 784     die "unable to apply firewall changes\n" if $errors;
 785 }
 786
 787 1;