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 # imported/converted from: /usr/share/shorewall/macro.*
  19 my $pve_fw_macros = {
  20     'Amanda' => [
  21         { action => 'PARAM', proto => 'udp', dport => '10080' },
  22         { action => 'PARAM', proto => 'tcp', dport => '10080' },
  23     ],
  24     'Auth' => [
  25         { action => 'PARAM', proto => 'tcp', dport => '113' },
  26     ],
  27     'BGP' => [
  28         { action => 'PARAM', proto => 'tcp', dport => '179' },
  29     ],
  30     'BitTorrent' => [
  31         { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
  32         { action => 'PARAM', proto => 'udp', dport => '6881' },
  33     ],
  34     'BitTorrent32' => [
  35         { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
  36         { action => 'PARAM', proto => 'udp', dport => '6881' },
  37     ],
  38     'CVS' => [
  39         { action => 'PARAM', proto => 'tcp', dport => '2401' },
  40     ],
  41     'Citrix' => [
  42         { action => 'PARAM', proto => 'tcp', dport => '1494' },
  43         { action => 'PARAM', proto => 'udp', dport => '1604' },
  44         { action => 'PARAM', proto => 'tcp', dport => '2598' },
  45     ],
  46     'DAAP' => [
  47         { action => 'PARAM', proto => 'tcp', dport => '3689' },
  48         { action => 'PARAM', proto => 'udp', dport => '3689' },
  49     ],
  50     'DCC' => [
  51         { action => 'PARAM', proto => 'tcp', dport => '6277' },
  52     ],
  53     'DHCPfwd' => [
  54         { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
  55         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '67:68', sport => '67:68' },
  56     ],
  57     'DNS' => [
  58         { action => 'PARAM', proto => 'udp', dport => '53' },
  59         { action => 'PARAM', proto => 'tcp', dport => '53' },
  60     ],
  61     'Distcc' => [
  62         { action => 'PARAM', proto => 'tcp', dport => '3632' },
  63     ],
  64     'Edonkey' => [
  65         { action => 'PARAM', proto => 'tcp', dport => '4662' },
  66         { action => 'PARAM', proto => 'udp', dport => '4665' },
  67     ],
  68     'FTP' => [
  69         { action => 'PARAM', proto => 'tcp', dport => '21' },
  70     ],
  71     'Finger' => [
  72         { action => 'PARAM', proto => 'tcp', dport => '79' },
  73     ],
  74     'GNUnet' => [
  75         { action => 'PARAM', proto => 'tcp', dport => '2086' },
  76         { action => 'PARAM', proto => 'udp', dport => '2086' },
  77         { action => 'PARAM', proto => 'tcp', dport => '1080' },
  78         { action => 'PARAM', proto => 'udp', dport => '1080' },
  79     ],
  80     'GRE' => [
  81         { action => 'PARAM', proto => '47' },
  82         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '47' },
  83     ],
  84     'Git' => [
  85         { action => 'PARAM', proto => 'tcp', dport => '9418' },
  86     ],
  87     'Gnutella' => [
  88         { action => 'PARAM', proto => 'tcp', dport => '6346' },
  89         { action => 'PARAM', proto => 'udp', dport => '6346' },
  90     ],
  91     'HKP' => [
  92         { action => 'PARAM', proto => 'tcp', dport => '11371' },
  93     ],
  94     'HTTP' => [
  95         { action => 'PARAM', proto => 'tcp', dport => '80' },
  96     ],
  97     'HTTPS' => [
  98         { action => 'PARAM', proto => 'tcp', dport => '443' },
  99     ],
 100     'ICPV2' => [
 101         { action => 'PARAM', proto => 'udp', dport => '3130' },
 102     ],
 103     'ICQ' => [
 104         { action => 'PARAM', proto => 'tcp', dport => '5190' },
 105     ],
 106     'IMAP' => [
 107         { action => 'PARAM', proto => 'tcp', dport => '143' },
 108     ],
 109     'IMAPS' => [
 110         { action => 'PARAM', proto => 'tcp', dport => '993' },
 111     ],
 112     'IPIP' => [
 113         { action => 'PARAM', proto => '94' },
 114         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '94' },
 115     ],
 116     'IPP' => [
 117         { action => 'PARAM', proto => 'tcp', dport => '631' },
 118     ],
 119     'IPPbrd' => [
 120         { action => 'PARAM', proto => 'udp', dport => '631' },
 121     ],
 122     'IPPserver' => [
 123         { action => 'PARAM', source => 'SOURCE', dest => 'DEST', proto => 'tcp', dport => '631' },
 124         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '631' },
 125     ],
 126     'IPsec' => [
 127         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 128         { action => 'PARAM', proto => '50' },
 129         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500', sport => '500' },
 130         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '50' },
 131     ],
 132     'IPsecah' => [
 133         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 134         { action => 'PARAM', proto => '51' },
 135         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500', sport => '500' },
 136         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '51' },
 137     ],
 138     'IPsecnat' => [
 139         { action => 'PARAM', proto => 'udp', dport => '500' },
 140         { action => 'PARAM', proto => 'udp', dport => '4500' },
 141         { action => 'PARAM', proto => '50' },
 142         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500' },
 143         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '4500' },
 144         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '50' },
 145     ],
 146     'IRC' => [
 147         { action => 'PARAM', proto => 'tcp', dport => '6667' },
 148     ],
 149     'JabberPlain' => [
 150         { action => 'PARAM', proto => 'tcp', dport => '5222' },
 151     ],
 152     'JabberSecure' => [
 153         { action => 'PARAM', proto => 'tcp', dport => '5223' },
 154     ],
 155     'Jabberd' => [
 156         { action => 'PARAM', proto => 'tcp', dport => '5269' },
 157     ],
 158     'Jetdirect' => [
 159         { action => 'PARAM', proto => 'tcp', dport => '9100' },
 160     ],
 161     'L2TP' => [
 162         { action => 'PARAM', proto => 'udp', dport => '1701' },
 163         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '1701' },
 164     ],
 165     'LDAP' => [
 166         { action => 'PARAM', proto => 'tcp', dport => '389' },
 167     ],
 168     'LDAPS' => [
 169         { action => 'PARAM', proto => 'tcp', dport => '636' },
 170     ],
 171     'MSNP' => [
 172         { action => 'PARAM', proto => 'tcp', dport => '1863' },
 173     ],
 174     'MSSQL' => [
 175         { action => 'PARAM', proto => 'tcp', dport => '1433' },
 176     ],
 177     'Mail' => [
 178         { action => 'PARAM', proto => 'tcp', dport => '25' },
 179         { action => 'PARAM', proto => 'tcp', dport => '465' },
 180         { action => 'PARAM', proto => 'tcp', dport => '587' },
 181     ],
 182     'Munin' => [
 183         { action => 'PARAM', proto => 'tcp', dport => '4949' },
 184     ],
 185     'MySQL' => [
 186         { action => 'PARAM', proto => 'tcp', dport => '3306' },
 187     ],
 188     'NNTP' => [
 189         { action => 'PARAM', proto => 'tcp', dport => '119' },
 190     ],
 191     'NNTPS' => [
 192         { action => 'PARAM', proto => 'tcp', dport => '563' },
 193     ],
 194     'NTP' => [
 195         { action => 'PARAM', proto => 'udp', dport => '123' },
 196     ],
 197     'NTPbi' => [
 198         { action => 'PARAM', proto => 'udp', dport => '123' },
 199         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '123' },
 200     ],
 201     'NTPbrd' => [
 202         { action => 'PARAM', proto => 'udp', dport => '123' },
 203         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '123' },
 204     ],
 205     'OSPF' => [
 206         { action => 'PARAM', proto => '89' },
 207     ],
 208     'OpenVPN' => [
 209         { action => 'PARAM', proto => 'udp', dport => '1194' },
 210     ],
 211     'PCA' => [
 212         { action => 'PARAM', proto => 'udp', dport => '5632' },
 213         { action => 'PARAM', proto => 'tcp', dport => '5631' },
 214     ],
 215     'POP3' => [
 216         { action => 'PARAM', proto => 'tcp', dport => '110' },
 217     ],
 218     'POP3S' => [
 219         { action => 'PARAM', proto => 'tcp', dport => '995' },
 220     ],
 221     'PPtP' => [
 222         { action => 'PARAM', proto => '47' },
 223         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '47' },
 224         { action => 'PARAM', proto => 'tcp', dport => '1723' },
 225     ],
 226     'Ping' => [
 227         { action => 'PARAM', proto => 'icmp', dport => '8' },
 228     ],
 229     'PostgreSQL' => [
 230         { action => 'PARAM', proto => 'tcp', dport => '5432' },
 231     ],
 232     'Printer' => [
 233         { action => 'PARAM', proto => 'tcp', dport => '515' },
 234     ],
 235     'RDP' => [
 236         { action => 'PARAM', proto => 'tcp', dport => '3389' },
 237     ],
 238     'RIPbi' => [
 239         { action => 'PARAM', proto => 'udp', dport => '520' },
 240         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '520' },
 241     ],
 242     'RNDC' => [
 243         { action => 'PARAM', proto => 'tcp', dport => '953' },
 244     ],
 245     'Razor' => [
 246         { action => 'ACCEPT', proto => 'tcp', dport => '2703' },
 247     ],
 248     'Rdate' => [
 249         { action => 'PARAM', proto => 'tcp', dport => '37' },
 250     ],
 251     'Rsync' => [
 252         { action => 'PARAM', proto => 'tcp', dport => '873' },
 253     ],
 254     'SANE' => [
 255         { action => 'PARAM', proto => 'tcp', dport => '6566' },
 256     ],
 257     'SMB' => [
 258         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 259         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 260         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 261         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 262     ],
 263     'SMBBI' => [
 264         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 265         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 266         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 267         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 268         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '135,445' },
 269         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '137:139' },
 270         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '1024:65535', sport => '137' },
 271         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'tcp', dport => '135,139,445' },
 272     ],
 273     'SMBswat' => [
 274         { action => 'PARAM', proto => 'tcp', dport => '901' },
 275     ],
 276     'SMTP' => [
 277         { action => 'PARAM', proto => 'tcp', dport => '25' },
 278     ],
 279     'SMTPS' => [
 280         { action => 'PARAM', proto => 'tcp', dport => '465' },
 281     ],
 282     'SNMP' => [
 283         { action => 'PARAM', proto => 'udp', dport => '161:162' },
 284         { action => 'PARAM', proto => 'tcp', dport => '161' },
 285     ],
 286     'SPAMD' => [
 287         { action => 'PARAM', proto => 'tcp', dport => '783' },
 288     ],
 289     'SSH' => [
 290         { action => 'PARAM', proto => 'tcp', dport => '22' },
 291     ],
 292     'SVN' => [
 293         { action => 'PARAM', proto => 'tcp', dport => '3690' },
 294     ],
 295     'SixXS' => [
 296         { action => 'PARAM', proto => 'tcp', dport => '3874' },
 297         { action => 'PARAM', proto => 'udp', dport => '3740' },
 298         { action => 'PARAM', proto => '41' },
 299         { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
 300     ],
 301     'Squid' => [
 302         { action => 'PARAM', proto => 'tcp', dport => '3128' },
 303     ],
 304     'Submission' => [
 305         { action => 'PARAM', proto => 'tcp', dport => '587' },
 306     ],
 307     'Syslog' => [
 308         { action => 'PARAM', proto => 'udp', dport => '514' },
 309         { action => 'PARAM', proto => 'tcp', dport => '514' },
 310     ],
 311     'TFTP' => [
 312         { action => 'PARAM', proto => 'udp', dport => '69' },
 313     ],
 314     'Telnet' => [
 315         { action => 'PARAM', proto => 'tcp', dport => '23' },
 316     ],
 317     'Telnets' => [
 318         { action => 'PARAM', proto => 'tcp', dport => '992' },
 319     ],
 320     'Time' => [
 321         { action => 'PARAM', proto => 'tcp', dport => '37' },
 322     ],
 323     'Trcrt' => [
 324         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 325         { action => 'PARAM', proto => 'icmp', dport => '8' },
 326     ],
 327     'VNC' => [
 328         { action => 'PARAM', proto => 'tcp', dport => '5900:5909' },
 329     ],
 330     'VNCL' => [
 331         { action => 'PARAM', proto => 'tcp', dport => '5500' },
 332     ],
 333     'Web' => [
 334         { action => 'PARAM', proto => 'tcp', dport => '80' },
 335         { action => 'PARAM', proto => 'tcp', dport => '443' },
 336     ],
 337     'Webcache' => [
 338         { action => 'PARAM', proto => 'tcp', dport => '8080' },
 339     ],
 340     'Webmin' => [
 341         { action => 'PARAM', proto => 'tcp', dport => '10000' },
 342     ],
 343     'Whois' => [
 344         { action => 'PARAM', proto => 'tcp', dport => '43' },
 345     ],
 346 };
 347
 348 my $pve_fw_parsed_macros;
 349 my $pve_fw_preferred_macro_names = {};
 350
 351 my $pve_std_chains = {
 352     'PVEFW-SET-ACCEPT-MARK' => [
 353         "-j MARK --set-mark 1",
 354     ],
 355 };
 356
 357 # iptables -p icmp -h
 358 my $icmp_type_names = {
 359     any => 1,
 360     'echo-reply' => 1,
 361     'destination-unreachable' => 1,
 362     'network-unreachable' => 1,
 363     'host-unreachable' => 1,
 364     'protocol-unreachable' => 1,
 365     'port-unreachable' => 1,
 366     'fragmentation-needed' => 1,
 367     'source-route-failed' => 1,
 368     'network-unknown' => 1,
 369     'host-unknown' => 1,
 370     'network-prohibited' => 1,
 371     'host-prohibited' => 1,
 372     'TOS-network-unreachable' => 1,
 373     'TOS-host-unreachable' => 1,
 374     'communication-prohibited' => 1,
 375     'host-precedence-violation' => 1,
 376     'precedence-cutoff' => 1,
 377     'source-quench' => 1,
 378     'redirect' => 1,
 379     'network-redirect' => 1,
 380     'host-redirect' => 1,
 381     'TOS-network-redirect' => 1,
 382     'TOS-host-redirect' => 1,
 383     'echo-request' => 1,
 384     'router-advertisement' => 1,
 385     'router-solicitation' => 1,
 386     'time-exceeded' => 1,
 387     'ttl-zero-during-transit' => 1,
 388     'ttl-zero-during-reassembly' => 1,
 389     'parameter-problem' => 1,
 390     'ip-header-bad' => 1,
 391     'required-option-missing' => 1,
 392     'timestamp-request' => 1,
 393     'timestamp-reply' => 1,
 394     'address-mask-request' => 1,
 395     'address-mask-reply' => 1,
 396 };
 397
 398 sub get_firewall_macros {
 399
 400     return $pve_fw_parsed_macros if $pve_fw_parsed_macros;
 401
 402     $pve_fw_parsed_macros = {};
 403
 404     foreach my $k (keys %$pve_fw_macros) {
 405         my $name = lc($k);
 406
 407         my $macro =  $pve_fw_macros->{$k};
 408         $pve_fw_preferred_macro_names->{$name} = $k;
 409         $pve_fw_parsed_macros->{$name} = $macro;
 410     }
 411
 412     return $pve_fw_parsed_macros;
 413 }
 414
 415 my $etc_services;
 416
 417 sub get_etc_services {
 418
 419     return $etc_services if $etc_services;
 420
 421     my $filename = "/etc/services";
 422
 423     my $fh = IO::File->new($filename, O_RDONLY);
 424     if (!$fh) {
 425         warn "unable to read '$filename' - $!\n";
 426         return {};
 427     }
 428
 429     my $services = {};
 430
 431     while (my $line = <$fh>) {
 432         chomp ($line);
 433         next if $line =~m/^#/;
 434         next if ($line =~m/^\s*$/);
 435
 436         if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp).*$!) {
 437             $services->{byid}->{$2}->{name} = $1;
 438             $services->{byid}->{$2}->{port} = $2;
 439             $services->{byid}->{$2}->{$3} = 1;
 440             $services->{byname}->{$1} = $services->{byid}->{$2};
 441         }
 442     }
 443
 444     close($fh);
 445
 446     $etc_services = $services;
 447
 448
 449     return $etc_services;
 450 }
 451
 452 my $etc_protocols;
 453
 454 sub get_etc_protocols {
 455     return $etc_protocols if $etc_protocols;
 456
 457     my $filename = "/etc/protocols";
 458
 459     my $fh = IO::File->new($filename, O_RDONLY);
 460     if (!$fh) {
 461         warn "unable to read '$filename' - $!\n";
 462         return {};
 463     }
 464
 465     my $protocols = {};
 466
 467     while (my $line = <$fh>) {
 468         chomp ($line);
 469         next if $line =~m/^#/;
 470         next if ($line =~m/^\s*$/);
 471
 472         if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
 473             $protocols->{byid}->{$2}->{name} = $1;
 474             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
 475         }
 476     }
 477
 478     close($fh);
 479
 480     $etc_protocols = $protocols;
 481
 482     return $etc_protocols;
 483 }
 484
 485 sub parse_address_list {
 486     my ($str) = @_;
 487
 488     my $nbaor = 0;
 489     foreach my $aor (split(/,/, $str)) {
 490         if (!Net::IP->new($aor)) {
 491             my $err = Net::IP::Error();
 492             die "invalid IP address: $err\n";
 493         }else{
 494             $nbaor++;
 495         }
 496     }
 497     return $nbaor;
 498 }
 499
 500 sub parse_port_name_number_or_range {
 501     my ($str) = @_;
 502
 503     my $services = PVE::Firewall::get_etc_services();
 504     my $nbports = 0;
 505     foreach my $item (split(/,/, $str)) {
 506         my $portlist = "";
 507         my $oldpon = undef;
 508         $nbports++;
 509         foreach my $pon (split(':', $item, 2)) {
 510             $pon = $services->{byname}->{$pon}->{port} if $services->{byname}->{$pon}->{port};
 511             if ($pon =~ m/^\d+$/){
 512                 die "invalid port '$pon'\n" if $pon < 0 && $pon > 65535;
 513                 die "port '$pon' must be bigger than port '$oldpon' \n" if $oldpon && ($pon < $oldpon);
 514                 $oldpon = $pon;
 515             }else{
 516                 die "invalid port $services->{byname}->{$pon}\n" if !$services->{byname}->{$pon};
 517             }
 518         }
 519     }
 520
 521     return ($nbports);
 522 }
 523
 524 my $bridge_firewall_enabled = 0;
 525
 526 sub enable_bridge_firewall {
 527
 528     return if $bridge_firewall_enabled; # only once
 529
 530     system("echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables");
 531     system("echo 1 > /proc/sys/net/bridge/bridge-nf-call-ip6tables");
 532
 533     $bridge_firewall_enabled = 1;
 534 }
 535
 536 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
 537
 538 sub iptables {
 539     my ($cmd) = @_;
 540
 541     run_command("/sbin/iptables $cmd", outfunc => sub {}, errfunc => sub {});
 542 }
 543
 544 sub iptables_restore_cmdlist {
 545     my ($cmdlist) = @_;
 546
 547     run_command("/sbin/iptables-restore -n", input => $cmdlist);
 548 }
 549
 550 sub iptables_get_chains {
 551
 552     my $res = {};
 553
 554     # check what chains we want to track
 555     my $is_pvefw_chain = sub {
 556         my $name = shift;
 557
 558         return 1 if $name =~ m/^PVEFW-\S+$/;
 559
 560         return 1 if $name =~ m/^tap\d+i\d+-(:?IN|OUT)$/;
 561         return 1 if $name =~ m/^vmbr\d+-(:?FW|IN|OUT)$/;
 562         return 1 if $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/;
 563
 564         return undef;
 565     };
 566
 567     my $table = '';
 568
 569     my $parser = sub {
 570         my $line = shift;
 571
 572         return if $line =~ m/^#/;
 573         return if $line =~ m/^\s*$/;
 574
 575         if ($line =~ m/^\*(\S+)$/) {
 576             $table = $1;
 577             return;
 578         }
 579
 580         return if $table ne 'filter';
 581
 582         if ($line =~ m/^:(\S+)\s/) {
 583             my $chain = $1;
 584             return if !&$is_pvefw_chain($chain);
 585             $res->{$chain} = "unknown";
 586         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
 587             my ($chain, $sig) = ($1, $2);
 588             return if !&$is_pvefw_chain($chain);
 589             $res->{$chain} = $sig;
 590         } else {
 591             # simply ignore the rest
 592             return;
 593         }
 594     };
 595
 596     run_command("/sbin/iptables-save", outfunc => $parser);
 597
 598     return $res;
 599 }
 600
 601 sub iptables_chain_exist {
 602     my ($chain) = @_;
 603
 604     eval{
 605         iptables("-n --list $chain");
 606     };
 607     return undef if $@;
 608
 609     return 1;
 610 }
 611
 612 sub iptables_rule_exist {
 613     my ($rule) = @_;
 614
 615     eval{
 616         iptables("-C $rule");
 617     };
 618     return undef if $@;
 619
 620     return 1;
 621 }
 622
 623 sub ruleset_generate_rule {
 624     my ($ruleset, $chain, $rule, $goto) = @_;
 625
 626     my $cmd = '';
 627
 628     $cmd .= " -m iprange --src-range" if $rule->{nbsource} && $rule->{nbsource} > 1;
 629     $cmd .= " -s $rule->{source}" if $rule->{source};
 630     $cmd .= " -m iprange --dst-range" if $rule->{nbdest} && $rule->{nbdest} > 1;
 631     $cmd .= " -d $rule->{dest}" if $rule->{dest};
 632     $cmd .= " -p $rule->{proto}" if $rule->{proto};
 633
 634     if (($rule->{nbdport} && $rule->{nbdport} > 1) ||
 635         ($rule->{nbsport} && $rule->{nbsport} > 1)) {
 636         $cmd .= " --match multiport"
 637     }
 638
 639     if ($rule->{dport}) {
 640         if ($rule->{proto} && $rule->{proto} eq 'icmp') {
 641             # Note: we use dport to store --icmp-type
 642             die "unknown icmp-type\n" if !$icmp_type_names->{$rule->{dport}};
 643             $cmd .= " -m icmp --icmp-type $rule->{dport}";
 644         } else {
 645             if ($rule->{nbdport} && $rule->{nbdport} > 1) {
 646                 $cmd .= " --dports $rule->{dport}";
 647             } else {
 648                 $cmd .= " --dport $rule->{dport}";
 649             }
 650         }
 651     }
 652
 653     if ($rule->{sport}) {
 654         if ($rule->{nbsport} && $rule->{nbsport} > 1) {
 655             $cmd .= " --sports $rule->{sport}";
 656         } else {
 657             $cmd .= " --sport $rule->{sport}";
 658         }
 659     }
 660
 661     $cmd .= " -m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
 662
 663     if (my $action = $rule->{action}) {
 664         $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
 665         $cmd .= $goto ? " -g $action" : " -j $action";
 666     };
 667
 668     ruleset_addrule($ruleset, $chain, $cmd) if $cmd;
 669 }
 670
 671 sub ruleset_create_chain {
 672     my ($ruleset, $chain) = @_;
 673
 674     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
 675
 676     die "chain '$chain' already exists\n" if $ruleset->{$chain};
 677
 678     $ruleset->{$chain} = [];
 679 }
 680
 681 sub ruleset_chain_exist {
 682     my ($ruleset, $chain) = @_;
 683
 684     return $ruleset->{$chain} ? 1 : undef;
 685 }
 686
 687 sub ruleset_addrule {
 688    my ($ruleset, $chain, $rule) = @_;
 689
 690    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 691
 692    push @{$ruleset->{$chain}}, "-A $chain $rule";
 693 }
 694
 695 sub ruleset_insertrule {
 696    my ($ruleset, $chain, $rule) = @_;
 697
 698    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 699
 700    unshift @{$ruleset->{$chain}}, "-A $chain $rule";
 701 }
 702
 703 sub generate_bridge_chains {
 704     my ($ruleset, $bridge) = @_;
 705
 706     if (!ruleset_chain_exist($ruleset, "PVEFW-FORWARD")){
 707         ruleset_create_chain($ruleset, "PVEFW-FORWARD");
 708         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 709     }
 710
 711     if (!ruleset_chain_exist($ruleset, "$bridge-FW")) {
 712         ruleset_create_chain($ruleset, "$bridge-FW");
 713         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -m physdev --physdev-is-bridged -j $bridge-FW");
 714         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -m physdev --physdev-is-bridged -j $bridge-FW");
 715         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -j DROP");  # disable interbridge routing
 716         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -j DROP"); # disable interbridge routing
 717     }
 718
 719     if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) {
 720         ruleset_create_chain($ruleset, "$bridge-OUT");
 721         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-in -j $bridge-OUT");
 722     }
 723
 724     if (!ruleset_chain_exist($ruleset, "$bridge-IN")) {
 725         ruleset_create_chain($ruleset, "$bridge-IN");
 726         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-out -j $bridge-IN");
 727         ruleset_addrule($ruleset, "$bridge-FW", "-m mark --mark 1 -j ACCEPT");
 728     }
 729 }
 730
 731 sub generate_tap_rules_direction {
 732     my ($ruleset, $group_rules, $iface, $netid, $macaddr, $vmfw_conf, $bridge, $direction) = @_;
 733
 734     my $rules = $vmfw_conf->{lc($direction)};
 735     my $options = $vmfw_conf->{options};
 736
 737     my $tapchain = "$iface-$direction";
 738
 739     ruleset_create_chain($ruleset, $tapchain);
 740
 741     ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate INVALID -j DROP");
 742     ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 743
 744     if ($direction eq 'OUT' && defined($macaddr)) {
 745         ruleset_addrule($ruleset, $tapchain, "-m mac ! --mac-source $macaddr -j DROP");
 746     }
 747
 748     if ($rules) {
 749         foreach my $rule (@$rules) {
 750             next if $rule->{iface} && $rule->{iface} ne $netid;
 751             # we go to $bridge-IN if accept in out rules
 752             if($rule->{action}  =~ m/^(GROUP-(\S+))$/){
 753                 $rule->{action} .= "-$direction";
 754                 # generate empty group rule if don't exist
 755                 if(!ruleset_chain_exist($ruleset, $rule->{action})){
 756                     generate_group_rules($ruleset, $group_rules, $2);
 757                 }
 758                 ruleset_generate_rule($ruleset, $tapchain, $rule);
 759                 ruleset_addrule($ruleset, $tapchain, "-m mark --mark 1 -j RETURN")
 760                     if $direction eq 'OUT';
 761             } else {
 762                 $rule->{action} = "PVEFW-SET-ACCEPT-MARK" if $rule->{action} eq 'ACCEPT' && $direction eq 'OUT';
 763                 ruleset_generate_rule($ruleset, $tapchain, $rule);
 764             }
 765         }
 766     }
 767
 768     # implement policy
 769     my $policy;
 770
 771     if ($direction eq 'OUT') {
 772         $policy = $options->{'policy-out'} || 'ACCEPT'; # allow everything by default
 773     } else {
 774         $policy = $options->{'policy-in'} || 'DROP'; # allow everything by default
 775     }
 776
 777     if ($policy eq 'ACCEPT') {
 778         if ($direction eq 'OUT') {
 779             ruleset_addrule($ruleset, $tapchain, "-g PVEFW-SET-ACCEPT-MARK");
 780         } else {
 781             ruleset_addrule($ruleset, $tapchain, "-j ACCEPT");
 782         }
 783     } elsif ($policy eq 'DROP') {
 784         ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-dropped: \" --log-level 4");
 785         ruleset_addrule($ruleset, $tapchain, "-j DROP");
 786     } elsif ($policy eq 'REJECT') {
 787         ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-reject: \" --log-level 4");
 788         ruleset_addrule($ruleset, $tapchain, "-j REJECT");
 789     } else {
 790         # should not happen
 791         die "internal error: unknown policy '$policy'";
 792     }
 793
 794     # plug the tap chain to bridge chain
 795     my $physdevdirection = $direction eq 'IN' ? "out" : "in";
 796     my $rule = "-m physdev --physdev-$physdevdirection $iface --physdev-is-bridged -j $tapchain";
 797     ruleset_insertrule($ruleset, "$bridge-$direction", $rule);
 798
 799     if ($direction eq 'OUT'){
 800         # add tap->host rules
 801         my $rule = "-m physdev --physdev-$physdevdirection $iface -j $tapchain";
 802         ruleset_addrule($ruleset, "PVEFW-INPUT", $rule);
 803     }
 804 }
 805
 806 sub enablehostfw {
 807     my ($ruleset, $rules, $group_rules) = @_;
 808
 809     # fixme: allow security groups
 810
 811     # host inbound firewall
 812     my $chain = "PVEFW-HOST-IN";
 813     ruleset_create_chain($ruleset, $chain);
 814
 815     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
 816     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 817     ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
 818     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 819     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW -m multiport --dports 5404,5405 -j ACCEPT");
 820     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT");  #corosync
 821
 822     if ($rules->{in}) {
 823         foreach my $rule (@{$rules->{in}}) {
 824             # we use RETURN because we need to check also tap rules
 825             $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT';
 826             ruleset_generate_rule($ruleset, $chain, $rule);
 827         }
 828     }
 829
 830     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-IN dropped: \" --log-level 4");
 831     ruleset_addrule($ruleset, $chain, "-j DROP");
 832
 833     # host outbound firewall
 834     $chain = "PVEFW-HOST-OUT";
 835     ruleset_create_chain($ruleset, $chain);
 836
 837     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
 838     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 839     ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
 840     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 841     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW -m multiport --dports 5404,5405 -j ACCEPT");
 842     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
 843
 844     if ($rules->{out}) {
 845         foreach my $rule (@{$rules->{out}}) {
 846             # we use RETURN because we need to check also tap rules
 847             $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT';
 848             ruleset_generate_rule($ruleset, $chain, $rule);
 849         }
 850     }
 851
 852     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-OUT dropped: \" --log-level 4");
 853     ruleset_addrule($ruleset, $chain, "-j DROP");
 854
 855     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
 856     ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
 857 }
 858
 859 sub generate_group_rules {
 860     my ($ruleset, $group_rules, $group) = @_;
 861
 862     my $rules = $group_rules->{$group};
 863
 864     die "no such security group '$group'\n" if !$rules;
 865
 866     my $chain = "GROUP-${group}-IN";
 867
 868     ruleset_create_chain($ruleset, $chain);
 869
 870     if ($rules->{in}) {
 871         foreach my $rule (@{$rules->{in}}) {
 872             ruleset_generate_rule($ruleset, $chain, $rule);
 873         }
 874     }
 875
 876     $chain = "GROUP-${group}-OUT";
 877
 878     ruleset_create_chain($ruleset, $chain);
 879     ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
 880
 881     if ($rules->{out}) {
 882         foreach my $rule (@{$rules->{out}}) {
 883             # we go the PVEFW-SET-ACCEPT-MARK Instead of ACCEPT) because we need to
 884             # check also other tap rules (and group rules can be set on any bridge,
 885             # so we can't go to VMBRXX-IN)
 886             $rule->{action} = 'PVEFW-SET-ACCEPT-MARK' if $rule->{action} eq 'ACCEPT';
 887             ruleset_generate_rule($ruleset, $chain, $rule);
 888         }
 889     }
 890 }
 891
 892 my $MAX_NETS = 32;
 893 my $valid_netdev_names = {};
 894 for (my $i = 0; $i < $MAX_NETS; $i++)  {
 895     $valid_netdev_names->{"net$i"} = 1;
 896 }
 897
 898 sub parse_fw_rule {
 899     my ($line, $need_iface, $allow_groups) = @_;
 900
 901     my $macros = get_firewall_macros();
 902     my $protocols = get_etc_protocols();
 903
 904     my ($action, $iface, $source, $dest, $proto, $dport, $sport);
 905
 906     $line =~ s/#.*$//;
 907
 908     my @data = split(/\s+/, $line);
 909     my $expected_elements = $need_iface ? 7 : 6;
 910
 911     die "wrong number of rule elements\n" if scalar(@data) > $expected_elements;
 912
 913     if ($need_iface) {
 914         ($action, $iface, $source, $dest, $proto, $dport, $sport) = @data
 915     } else {
 916         ($action, $source, $dest, $proto, $dport, $sport) =  @data;
 917     }
 918
 919     die "incomplete rule\n" if !$action;
 920
 921     my $macro;
 922     my $macro_name;
 923
 924     if ($action =~ m/^(ACCEPT|DROP|REJECT)$/) {
 925         # OK
 926     } elsif ($allow_groups && $action =~ m/^GROUP-(:?\S+)$/) {
 927         # OK
 928     } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
 929         ($macro_name, $action) = ($1, $2);
 930         my $lc_macro_name = lc($macro_name);
 931         my $preferred_name = $pve_fw_preferred_macro_names->{$lc_macro_name};
 932         $macro_name = $preferred_name if $preferred_name;
 933         $macro = $macros->{$lc_macro_name};
 934         die "unknown macro '$macro_name'\n" if !$macro;
 935     } else {
 936         die "unknown action '$action'\n";
 937     }
 938
 939     if ($need_iface) {
 940         $iface = undef if $iface && $iface eq '-';
 941         die "unknown interface '$iface'\n"
 942             if defined($iface) && !$valid_netdev_names->{$iface};
 943     }
 944
 945     $proto = undef if $proto && $proto eq '-';
 946     die "unknown protokol '$proto'\n" if $proto &&
 947         !(defined($protocols->{byname}->{$proto}) ||
 948           defined($protocols->{byid}->{$proto}));
 949
 950     $source = undef if $source && $source eq '-';
 951     $dest = undef if $dest && $dest eq '-';
 952
 953     $dport = undef if $dport && $dport eq '-';
 954     $sport = undef if $sport && $sport eq '-';
 955
 956     my $nbsource = undef;
 957     my $nbdest = undef;
 958
 959     $nbsource = parse_address_list($source) if $source;
 960     $nbdest = parse_address_list($dest) if $dest;
 961
 962     my $rules = [];
 963
 964     my $param = {
 965         action => $action,
 966         iface => $iface,
 967         source => $source,
 968         dest => $dest,
 969         nbsource => $nbsource,
 970         nbdest => $nbdest,
 971         proto => $proto,
 972         dport => $dport,
 973         sport => $sport,
 974     };
 975
 976     if ($macro) {
 977         foreach my $templ (@$macro) {
 978             my $rule = {};
 979             foreach my $k (keys %$templ) {
 980                 my $v = $templ->{$k};
 981                 if ($v eq 'PARAM') {
 982                     $v = $param->{$k};
 983                 } elsif ($v eq 'DEST') {
 984                     $v = $param->{dest};
 985                 } elsif ($v eq 'SOURCE') {
 986                     $v = $param->{source};
 987                 }
 988
 989                 die "missing parameter '$k' in macro '$macro_name'\n" if !defined($v);
 990                 $rule->{$k} = $v;
 991             }
 992             push @$rules, $rule;
 993         }
 994     } else {
 995         push @$rules, $param;
 996     }
 997
 998     foreach my $rule (@$rules) {
 999         $rule->{nbdport} = parse_port_name_number_or_range($rule->{dport})
1000             if defined($rule->{dport});
1001         $rule->{nbsport} = parse_port_name_number_or_range($rule->{sport})
1002             if defined($rule->{sport});
1003     }
1004
1005     return $rules;
1006 }
1007
1008 sub parse_fw_option {
1009     my ($line) = @_;
1010
1011     my ($opt, $value);
1012
1013     if ($line =~ m/^enable:\s*(0|1)\s*$/i) {
1014         $opt = 'enable';
1015         $value = int($1);
1016     } elsif ($line =~ m/^(policy-(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1017         $opt = lc($1);
1018         $value = uc($3);
1019      } else {
1020         chomp $line;
1021         die "can't parse option '$line'\n"
1022     }
1023
1024     return ($opt, $value);
1025 }
1026
1027 sub parse_vm_fw_rules {
1028     my ($filename, $fh) = @_;
1029
1030     my $res = { in => [], out => [], options => {}};
1031
1032     my $section;
1033
1034     while (defined(my $line = <$fh>)) {
1035         next if $line =~ m/^#/;
1036         next if $line =~ m/^\s*$/;
1037
1038         my $linenr = $fh->input_line_number();
1039         my $prefix = "$filename (line $linenr)";
1040
1041         if ($line =~ m/^\[(\S+)\]\s*$/i) {
1042             $section = lc($1);
1043             warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1044             next;
1045         }
1046         if (!$section) {
1047             warn "$prefix: skip line - no section";
1048             next;
1049         }
1050
1051         next if !$res->{$section}; # skip undefined section
1052
1053         if ($section eq 'options') {
1054             eval {
1055                 my ($opt, $value) = parse_fw_option($line);
1056                 $res->{options}->{$opt} = $value;
1057             };
1058             warn "$prefix: $@" if $@;
1059             next;
1060         }
1061
1062         my $rules;
1063         eval { $rules = parse_fw_rule($line, 1, 1); };
1064         if (my $err = $@) {
1065             warn "$prefix: $err";
1066             next;
1067         }
1068
1069         push @{$res->{$section}}, @$rules;
1070     }
1071
1072     return $res;
1073 }
1074
1075 sub parse_host_fw_rules {
1076     my ($filename, $fh) = @_;
1077
1078     my $res = { in => [], out => [] };
1079
1080     my $section;
1081
1082     while (defined(my $line = <$fh>)) {
1083         next if $line =~ m/^#/;
1084         next if $line =~ m/^\s*$/;
1085
1086         my $linenr = $fh->input_line_number();
1087         my $prefix = "$filename (line $linenr)";
1088
1089         if ($line =~ m/^\[(in|out)\]\s*$/i) {
1090             $section = lc($1);
1091             next;
1092         }
1093         if (!$section) {
1094             warn "$prefix: skip line - no section";
1095             next;
1096         }
1097
1098         my $rules;
1099         eval { $rules = parse_fw_rule($line, 1, 1); };
1100         if (my $err = $@) {
1101             warn "$prefix: $err";
1102             next;
1103         }
1104
1105         push @{$res->{$section}}, @$rules;
1106     }
1107
1108     return $res;
1109 }
1110
1111 sub parse_group_fw_rules {
1112     my ($filename, $fh) = @_;
1113
1114     my $section;
1115     my $group;
1116
1117     my $res = { in => [], out => [] };
1118
1119     while (defined(my $line = <$fh>)) {
1120         next if $line =~ m/^#/;
1121         next if $line =~ m/^\s*$/;
1122
1123         my $linenr = $fh->input_line_number();
1124         my $prefix = "$filename (line $linenr)";
1125
1126         if ($line =~ m/^\[(in|out):(\S+)\]\s*$/i) {
1127             $section = lc($1);
1128             $group = lc($2);
1129             next;
1130         }
1131         if (!$section || !$group) {
1132             warn "$prefix: skip line - no section";
1133             next;
1134         }
1135
1136         my $rules;
1137         eval { $rules = parse_fw_rule($line, 0, 0); };
1138         if (my $err = $@) {
1139             warn "$prefix: $err";
1140             next;
1141         }
1142
1143         push @{$res->{$group}->{$section}}, @$rules;
1144     }
1145
1146     return $res;
1147 }
1148
1149 sub run_locked {
1150     my ($code, @param) = @_;
1151
1152     my $timeout = 10;
1153
1154     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
1155
1156     die $@ if $@;
1157
1158     return $res;
1159 }
1160
1161 sub read_local_vm_config {
1162
1163     my $openvz = {};
1164
1165     my $qemu = {};
1166
1167     my $list = PVE::QemuServer::config_list();
1168
1169     foreach my $vmid (keys %$list) {
1170         my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
1171         if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
1172             $qemu->{$vmid} = $conf;
1173         }
1174     }
1175
1176     my $vmdata = { openvz => $openvz, qemu => $qemu };
1177
1178     return $vmdata;
1179 };
1180
1181 sub read_vm_firewall_rules {
1182     my ($vmdata) = @_;
1183     my $rules = {};
1184     foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
1185         my $filename = "/etc/pve/firewall/$vmid.fw";
1186         my $fh = IO::File->new($filename, O_RDONLY);
1187         next if !$fh;
1188
1189         $rules->{$vmid} = parse_vm_fw_rules($filename, $fh);
1190     }
1191
1192     return $rules;
1193 }
1194
1195 sub generate_std_chains {
1196     my ($ruleset) = @_;
1197
1198     foreach my $chain (keys %$pve_std_chains) {
1199         ruleset_create_chain($ruleset, $chain);
1200         foreach my $rule (@{$pve_std_chains->{$chain}}) {
1201             if (ref($rule)) {
1202                 ruleset_generate_rule($ruleset, $chain, $rule);
1203             } else {
1204                 ruleset_addrule($ruleset, $chain, $rule);
1205             }
1206         }
1207     }
1208 }
1209
1210 sub compile {
1211     my $vmdata = read_local_vm_config();
1212     my $rules = read_vm_firewall_rules($vmdata);
1213
1214     my $group_rules = {};
1215     my $filename = "/etc/pve/firewall/groups.fw";
1216     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1217         $group_rules = parse_group_fw_rules($filename, $fh);
1218     }
1219
1220     #print Dumper($rules);
1221
1222     my $ruleset = {};
1223
1224     ruleset_create_chain($ruleset, "PVEFW-INPUT");
1225     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
1226     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
1227
1228     generate_std_chains($ruleset);
1229
1230     my $enable_hostfw = 0;
1231     $filename = "/etc/pve/local/host.fw";
1232     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1233         my $host_rules = parse_host_fw_rules($filename, $fh);
1234
1235         $enable_hostfw = 1;
1236
1237         enablehostfw($ruleset, $host_rules, $group_rules);
1238     }
1239
1240     # generate firewall rules for QEMU VMs
1241     foreach my $vmid (keys %{$vmdata->{qemu}}) {
1242         my $conf = $vmdata->{qemu}->{$vmid};
1243         my $vmfw_conf = $rules->{$vmid};
1244         next if !$vmfw_conf;
1245         next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
1246
1247         foreach my $netid (keys %$conf) {
1248             next if $netid !~ m/^net(\d+)$/;
1249             my $net = PVE::QemuServer::parse_net($conf->{$netid});
1250             next if !$net;
1251             my $iface = "tap${vmid}i$1";
1252
1253             my $bridge = $net->{bridge};
1254             next if !$bridge; # fixme: ?
1255
1256             $bridge .= "v$net->{tag}" if $net->{tag};
1257
1258
1259             generate_bridge_chains($ruleset, $bridge);
1260
1261             my $macaddr = $net->{macaddr};
1262             generate_tap_rules_direction($ruleset, $group_rules, $iface, $netid, $macaddr, $vmfw_conf, $bridge, 'IN');
1263             generate_tap_rules_direction($ruleset, $group_rules, $iface, $netid, $macaddr, $vmfw_conf, $bridge, 'OUT');
1264         }
1265     }
1266
1267     if ($enable_hostfw) {
1268         # allow traffic from lo (ourself)
1269         ruleset_addrule($ruleset, "PVEFW-INPUT", "-i lo -j ACCEPT");
1270     }
1271
1272     return $ruleset;
1273 }
1274
1275 sub get_ruleset_status {
1276     my ($ruleset, $verbose) = @_;
1277
1278     my $active_chains = iptables_get_chains();
1279
1280     my $statushash = {};
1281
1282     foreach my $chain (sort keys %$ruleset) {
1283         my $digest = Digest::SHA->new('sha1');
1284         foreach my $cmd (@{$ruleset->{$chain}}) {
1285              $digest->add("$cmd\n");
1286         }
1287         my $sig = $digest->b64digest;
1288         $statushash->{$chain}->{sig} = $sig;
1289
1290         my $oldsig = $active_chains->{$chain};
1291         if (!defined($oldsig)) {
1292             $statushash->{$chain}->{action} = 'create';
1293         } else {
1294             if ($oldsig eq $sig) {
1295                 $statushash->{$chain}->{action} = 'exists';
1296             } else {
1297                 $statushash->{$chain}->{action} = 'update';
1298             }
1299         }
1300         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
1301         foreach my $cmd (@{$ruleset->{$chain}}) {
1302             print "\t$cmd\n" if $verbose;
1303         }
1304     }
1305
1306     foreach my $chain (sort keys %$active_chains) {
1307         if (!defined($ruleset->{$chain})) {
1308             my $sig = $active_chains->{$chain};
1309             $statushash->{$chain}->{action} = 'delete';
1310             $statushash->{$chain}->{sig} = $sig;
1311             print "delete $chain ($sig)\n" if $verbose;
1312         }
1313     }
1314
1315     return $statushash;
1316 }
1317
1318 sub print_ruleset {
1319     my ($ruleset) = @_;
1320
1321     get_ruleset_status($ruleset, 1);
1322 }
1323
1324 sub print_sig_rule {
1325     my ($chain, $sig) = @_;
1326
1327     # We just use this to store a SHA1 checksum used to detect changes
1328     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
1329 }
1330
1331 sub apply_ruleset {
1332     my ($ruleset, $verbose) = @_;
1333
1334     enable_bridge_firewall();
1335
1336     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
1337
1338     my $statushash = get_ruleset_status($ruleset, $verbose);
1339
1340     # create missing chains first
1341     foreach my $chain (sort keys %$ruleset) {
1342         my $stat = $statushash->{$chain};
1343         die "internal error" if !$stat;
1344         next if $stat->{action} ne 'create';
1345
1346         $cmdlist .= ":$chain - [0:0]\n";
1347     }
1348
1349     my $rule = "INPUT -j PVEFW-INPUT";
1350     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1351         $cmdlist .= "-A $rule\n";
1352     }
1353     $rule = "OUTPUT -j PVEFW-OUTPUT";
1354     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1355         $cmdlist .= "-A $rule\n";
1356     }
1357
1358     $rule = "FORWARD -j PVEFW-FORWARD";
1359     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1360         $cmdlist .= "-A $rule\n";
1361     }
1362
1363     foreach my $chain (sort keys %$ruleset) {
1364         my $stat = $statushash->{$chain};
1365         die "internal error" if !$stat;
1366
1367         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
1368             $cmdlist .= "-F $chain\n";
1369             foreach my $cmd (@{$ruleset->{$chain}}) {
1370                 $cmdlist .= "$cmd\n";
1371             }
1372             $cmdlist .= print_sig_rule($chain, $stat->{sig});
1373         } elsif ($stat->{action} eq 'delete') {
1374             die "internal error"; # this should not happen
1375         } elsif ($stat->{action} eq 'exists') {
1376             # do nothing
1377         } else {
1378             die "internal error - unknown status '$stat->{action}'";
1379         }
1380     }
1381
1382     foreach my $chain (keys %$statushash) {
1383         next if $statushash->{$chain}->{action} ne 'delete';
1384         $cmdlist .= "-F $chain\n";
1385     }
1386     foreach my $chain (keys %$statushash) {
1387         next if $statushash->{$chain}->{action} ne 'delete';
1388         next if $chain eq 'PVEFW-INPUT';
1389         next if $chain eq 'PVEFW-OUTPUT';
1390         next if $chain eq 'PVEFW-FORWARD';
1391         $cmdlist .= "-X $chain\n";
1392     }
1393
1394     $cmdlist .= "COMMIT\n";
1395
1396     print $cmdlist if $verbose;
1397
1398     iptables_restore_cmdlist($cmdlist);
1399
1400     # test: re-read status and check if everything is up to date
1401     $statushash = get_ruleset_status($ruleset);
1402
1403     my $errors;
1404     foreach my $chain (sort keys %$ruleset) {
1405         my $stat = $statushash->{$chain};
1406         if ($stat->{action} ne 'exists') {
1407             warn "unable to update chain '$chain'\n";
1408             $errors = 1;
1409         }
1410     }
1411
1412     die "unable to apply firewall changes\n" if $errors;
1413 }
1414
1415 1;