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, $goto) = @_;
 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
 254     if (my $action = $rule->{action}) {
 255         $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
 256         $cmd .= $goto ? " -g $action" : " -j $action";
 257     };
 258
 259     ruleset_addrule($ruleset, $chain, $cmd) if $cmd;
 260 }
 261
 262 sub ruleset_create_chain {
 263     my ($ruleset, $chain) = @_;
 264
 265     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
 266
 267     die "chain '$chain' already exists\n" if $ruleset->{$chain};
 268
 269     $ruleset->{$chain} = [];
 270 }
 271
 272 sub ruleset_chain_exist {
 273     my ($ruleset, $chain) = @_;
 274
 275     return $ruleset->{$chain} ? 1 : undef;
 276 }
 277
 278 sub ruleset_addrule {
 279    my ($ruleset, $chain, $rule) = @_;
 280
 281    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 282
 283    push @{$ruleset->{$chain}}, "-A $chain $rule";
 284 }
 285
 286 sub ruleset_insertrule {
 287    my ($ruleset, $chain, $rule) = @_;
 288
 289    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 290
 291    unshift @{$ruleset->{$chain}}, "-A $chain $rule";
 292 }
 293
 294 sub generate_bridge_chains {
 295     my ($ruleset, $bridge) = @_;
 296
 297     if (!ruleset_chain_exist($ruleset, "PVEFW-BRIDGE-IN")){
 298         ruleset_create_chain($ruleset, "PVEFW-BRIDGE-IN");
 299     }
 300
 301     if (!ruleset_chain_exist($ruleset, "PVEFW-BRIDGE-OUT")){
 302         ruleset_create_chain($ruleset, "PVEFW-BRIDGE-OUT");
 303     }
 304
 305     if (!ruleset_chain_exist($ruleset, "PVEFW-FORWARD")){
 306         ruleset_create_chain($ruleset, "PVEFW-FORWARD");
 307
 308         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 309         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-in --physdev-is-bridged -j PVEFW-BRIDGE-OUT");
 310         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-out --physdev-is-bridged -j PVEFW-BRIDGE-IN");
 311     }
 312
 313     if (!ruleset_chain_exist($ruleset, "$bridge-IN")) {
 314         ruleset_create_chain($ruleset, "$bridge-IN");
 315         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -j DROP");  # disable interbridge routing
 316         ruleset_addrule($ruleset, "PVEFW-BRIDGE-IN", "-j $bridge-IN");
 317         ruleset_addrule($ruleset, "$bridge-IN", "-j ACCEPT");
 318     }
 319
 320     if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) {
 321         ruleset_create_chain($ruleset, "$bridge-OUT");
 322         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -j DROP"); # disable interbridge routing
 323         ruleset_addrule($ruleset, "PVEFW-BRIDGE-OUT", "-j $bridge-OUT");
 324     }
 325 }
 326
 327 sub generate_tap_rules_direction {
 328     my ($ruleset, $group_rules, $iface, $netid, $macaddr, $rules, $bridge, $direction) = @_;
 329
 330     my $tapchain = "$iface-$direction";
 331
 332     ruleset_create_chain($ruleset, $tapchain);
 333
 334     ruleset_addrule($ruleset, $tapchain, "-m state --state INVALID -j DROP");
 335     ruleset_addrule($ruleset, $tapchain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 336
 337     if ($direction eq 'OUT' && defined($macaddr)) {
 338         ruleset_addrule($ruleset, $tapchain, "-m mac ! --mac-source $macaddr -j DROP");
 339     }
 340
 341     if ($rules) {
 342         foreach my $rule (@$rules) {
 343             next if $rule->{iface} && $rule->{iface} ne $netid;
 344             if($rule->{action}  =~ m/^(GROUP-(\S+))$/){
 345                 $rule->{action} .= "-$direction";
 346                 # generate empty group rule if don't exist
 347                 if(!ruleset_chain_exist($ruleset, $rule->{action})){
 348                     generate_group_rules($ruleset, $group_rules, $2);
 349                 }
 350                 ruleset_generate_rule($ruleset, $tapchain, $rule);
 351                 ruleset_addrule($ruleset, $tapchain, "-m mark --mark 1 -g $bridge-IN");
 352             } else {
 353                 # we go to vmbr-IN if accept in out rules
 354                 $rule->{action} = "$bridge-IN" if $rule->{action} eq 'ACCEPT' && $direction eq 'OUT';
 355                 ruleset_generate_rule($ruleset, $tapchain, $rule);
 356             }
 357         }
 358     }
 359
 360     ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-dropped: \" --log-level 4");
 361     ruleset_addrule($ruleset, $tapchain, "-j DROP");
 362
 363     # plug the tap chain to bridge chain
 364     my $physdevdirection = $direction eq 'IN' ? "out" : "in";
 365     my $rule = "-m physdev --physdev-$physdevdirection $iface --physdev-is-bridged -j $tapchain";
 366     ruleset_insertrule($ruleset, "$bridge-$direction", $rule);
 367
 368     if ($direction eq 'OUT'){
 369         # add tap->host rules
 370         my $rule = "-m physdev --physdev-$physdevdirection $iface -j $tapchain";
 371         ruleset_addrule($ruleset, "PVEFW-INPUT", $rule);
 372     }
 373 }
 374
 375 sub enablehostfw {
 376     my ($ruleset, $rules, $group_rules) = @_;
 377
 378     # fixme: allow security groups
 379
 380     # host inbound firewall
 381     my $chain = "PVEFW-HOST-IN";
 382     ruleset_create_chain($ruleset, $chain);
 383
 384     ruleset_addrule($ruleset, $chain, "-m state --state INVALID -j DROP");
 385     ruleset_addrule($ruleset, $chain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 386     ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
 387     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 388     ruleset_addrule($ruleset, $chain, "-p udp -m state --state NEW -m multiport --dports 5404,5405 -j ACCEPT");
 389     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT");  #corosync
 390
 391     if ($rules->{in}) {
 392         foreach my $rule (@{$rules->{in}}) {
 393             # we use RETURN because we need to check also tap rules
 394             $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT';
 395             ruleset_generate_rule($ruleset, $chain, $rule);
 396         }
 397     }
 398
 399     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-IN dropped: \" --log-level 4");
 400     ruleset_addrule($ruleset, $chain, "-j DROP");
 401
 402     # host outbound firewall
 403     $chain = "PVEFW-HOST-OUT";
 404     ruleset_create_chain($ruleset, $chain);
 405
 406     ruleset_addrule($ruleset, $chain, "-m state --state INVALID -j DROP");
 407     ruleset_addrule($ruleset, $chain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
 408     ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
 409     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 410     ruleset_addrule($ruleset, $chain, "-p udp -m state --state NEW -m multiport --dports 5404,5405 -j ACCEPT");
 411     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
 412
 413     if ($rules->{out}) {
 414         foreach my $rule (@{$rules->{out}}) {
 415             # we use RETURN because we need to check also tap rules
 416             $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT';
 417             ruleset_generate_rule($ruleset, $chain, $rule);
 418         }
 419     }
 420
 421     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-OUT dropped: \" --log-level 4");
 422     ruleset_addrule($ruleset, $chain, "-j DROP");
 423
 424     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
 425     ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
 426 }
 427
 428 sub generate_group_rules {
 429     my ($ruleset, $group_rules, $group) = @_;
 430
 431     my $rules = $group_rules->{$group};
 432
 433     die "no such security group '$group'\n" if !$rules;
 434
 435     my $chain = "GROUP-${group}-IN";
 436
 437     ruleset_create_chain($ruleset, $chain);
 438
 439     if ($rules->{in}) {
 440         foreach my $rule (@{$rules->{in}}) {
 441             ruleset_generate_rule($ruleset, $chain, $rule);
 442         }
 443     }
 444
 445     $chain = "GROUP-${group}-OUT";
 446
 447     ruleset_create_chain($ruleset, $chain);
 448     ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
 449
 450     if ($rules->{out}) {
 451         foreach my $rule (@{$rules->{out}}) {
 452             # we go the PVEFW-SET-ACCEPT-MARK Instead of ACCEPT) because we need to
 453             # check also other tap rules (and group rules can be set on any bridge,
 454             # so we can't go to VMBRXX-IN)
 455             $rule->{action} = 'PVEFW-SET-ACCEPT-MARK' if $rule->{action} eq 'ACCEPT';
 456             ruleset_generate_rule($ruleset, $chain, $rule);
 457         }
 458     }
 459 }
 460
 461 my $MAX_NETS = 32;
 462 my $valid_netdev_names = {};
 463 for (my $i = 0; $i < $MAX_NETS; $i++)  {
 464     $valid_netdev_names->{"net$i"} = 1;
 465 }
 466
 467 sub parse_fw_rule {
 468     my ($line, $need_iface, $allow_groups) = @_;
 469
 470     my $macros = get_firewall_macros();
 471     my $protocols = get_etc_protocols();
 472
 473     my ($action, $iface, $source, $dest, $proto, $dport, $sport);
 474
 475     $line =~ s/#.*$//;
 476
 477     my @data = split(/\s+/, $line);
 478     my $expected_elements = $need_iface ? 7 : 6;
 479
 480     die "wrong number of rule elements\n" if scalar(@data) > $expected_elements;
 481
 482     if ($need_iface) {
 483         ($action, $iface, $source, $dest, $proto, $dport, $sport) = @data
 484     } else {
 485         ($action, $source, $dest, $proto, $dport, $sport) =  @data;
 486     }
 487
 488     die "incomplete rule\n" if !$action;
 489
 490     my $service;
 491     if ($action =~ m/^(ACCEPT|DROP|REJECT)$/) {
 492         # OK
 493     } elsif ($allow_groups && $action =~ m/^GROUP-(:?\S+)$/) {
 494         # OK
 495     } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
 496         ($service, $action) = ($1, $2);
 497         if (!$macros->{$service}) {
 498             die "unknown service '$service'\n";
 499         }
 500     } else {
 501         die "unknown action '$action'\n";
 502     }
 503
 504     if ($need_iface) {
 505         $iface = undef if $iface && $iface eq '-';
 506         die "unknown interface '$iface'\n"
 507             if defined($iface) && !$valid_netdev_names->{$iface};
 508     }
 509
 510     $proto = undef if $proto && $proto eq '-';
 511     die "unknown protokol '$proto'\n" if $proto &&
 512         !(defined($protocols->{byname}->{$proto}) ||
 513           defined($protocols->{byid}->{$proto}));
 514
 515     $source = undef if $source && $source eq '-';
 516     $dest = undef if $dest && $dest eq '-';
 517
 518     $dport = undef if $dport && $dport eq '-';
 519     $sport = undef if $sport && $sport eq '-';
 520
 521     my $nbdport = undef;
 522     my $nbsport = undef;
 523     my $nbsource = undef;
 524     my $nbdest = undef;
 525
 526     $nbsource = parse_address_list($source) if $source;
 527     $nbdest = parse_address_list($dest) if $dest;
 528     $nbdport = parse_port_name_number_or_range($dport) if $dport;
 529     $nbsport = parse_port_name_number_or_range($sport) if $sport;
 530
 531     return {
 532         action => $action,
 533         service => $service,
 534         iface => $iface,
 535         source => $source,
 536         dest => $dest,
 537         nbsource => $nbsource,
 538         nbdest => $nbdest,
 539         proto => $proto,
 540         dport => $dport,
 541         sport => $sport,
 542         nbdport => $nbdport,
 543         nbsport => $nbsport,
 544     };
 545 }
 546
 547 sub parse_vm_fw_rules {
 548     my ($filename, $fh) = @_;
 549
 550     my $res = { in => [], out => [] };
 551
 552     my $section;
 553
 554     while (defined(my $line = <$fh>)) {
 555         next if $line =~ m/^#/;
 556         next if $line =~ m/^\s*$/;
 557
 558         if ($line =~ m/^\[(in|out)\]\s*$/i) {
 559             $section = lc($1);
 560             next;
 561         }
 562         if (!$section) {
 563             warn "$filename (line $.): skip line - no section";
 564             next;
 565         }
 566
 567         my $rule;
 568         eval { $rule = parse_fw_rule($line, 1, 1); };
 569         if (my $err = $@) {
 570             warn "$filename (line $.): $err";
 571             next;
 572         }
 573
 574         push @{$res->{$section}}, $rule;
 575     }
 576
 577     return $res;
 578 }
 579
 580 sub parse_host_fw_rules {
 581     my ($filename, $fh) = @_;
 582
 583     my $res = { in => [], out => [] };
 584
 585     my $section;
 586
 587     while (defined(my $line = <$fh>)) {
 588         next if $line =~ m/^#/;
 589         next if $line =~ m/^\s*$/;
 590
 591         if ($line =~ m/^\[(in|out)\]\s*$/i) {
 592             $section = lc($1);
 593             next;
 594         }
 595         if (!$section) {
 596             warn "$filename (line $.): skip line - no section";
 597             next;
 598         }
 599
 600         my $rule;
 601         eval { $rule = parse_fw_rule($line, 1, 1); };
 602         if (my $err = $@) {
 603             warn "$filename (line $.): $err";
 604             next;
 605         }
 606
 607         push @{$res->{$section}}, $rule;
 608     }
 609
 610     return $res;
 611 }
 612
 613 sub parse_group_fw_rules {
 614     my ($filename, $fh) = @_;
 615
 616     my $section;
 617     my $group;
 618
 619     my $res = { in => [], out => [] };
 620
 621     while (defined(my $line = <$fh>)) {
 622         next if $line =~ m/^#/;
 623         next if $line =~ m/^\s*$/;
 624
 625         if ($line =~ m/^\[(in|out):(\S+)\]\s*$/i) {
 626             $section = lc($1);
 627             $group = lc($2);
 628             next;
 629         }
 630         if (!$section || !$group) {
 631             warn "$filename (line $.): skip line - no section";
 632             next;
 633         }
 634
 635         my $rule;
 636         eval { $rule = parse_fw_rule($line, 0, 0); };
 637         if (my $err = $@) {
 638             warn "$filename (line $.): $err";
 639             next;
 640         }
 641
 642         push @{$res->{$group}->{$section}}, $rule;
 643     }
 644
 645     return $res;
 646 }
 647
 648 sub run_locked {
 649     my ($code, @param) = @_;
 650
 651     my $timeout = 10;
 652
 653     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
 654
 655     die $@ if $@;
 656
 657     return $res;
 658 }
 659
 660 sub read_local_vm_config {
 661
 662     my $openvz = {};
 663
 664     my $qemu = {};
 665
 666     my $list = PVE::QemuServer::config_list();
 667
 668     foreach my $vmid (keys %$list) {
 669         my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
 670         if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
 671             $qemu->{$vmid} = $conf;
 672         }
 673     }
 674
 675     my $vmdata = { openvz => $openvz, qemu => $qemu };
 676
 677     return $vmdata;
 678 };
 679
 680 sub read_vm_firewall_rules {
 681     my ($vmdata) = @_;
 682     my $rules = {};
 683     foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
 684         my $filename = "/etc/pve/firewall/$vmid.fw";
 685         my $fh = IO::File->new($filename, O_RDONLY);
 686         next if !$fh;
 687
 688         $rules->{$vmid} = parse_vm_fw_rules($filename, $fh);
 689     }
 690
 691     return $rules;
 692 }
 693
 694 sub compile {
 695     my $vmdata = read_local_vm_config();
 696     my $rules = read_vm_firewall_rules($vmdata);
 697
 698     my $group_rules = {};
 699     my $filename = "/etc/pve/firewall/groups.fw";
 700     if (my $fh = IO::File->new($filename, O_RDONLY)) {
 701         $group_rules = parse_group_fw_rules($filename, $fh);
 702     }
 703
 704     #print Dumper($rules);
 705
 706     my $ruleset = {};
 707
 708     # setup host firewall rules
 709     ruleset_create_chain($ruleset, "PVEFW-INPUT");
 710     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
 711
 712     ruleset_create_chain($ruleset, "PVEFW-SET-ACCEPT-MARK");
 713     ruleset_addrule($ruleset, "PVEFW-SET-ACCEPT-MARK", "-j MARK --set-mark 1");
 714
 715     $filename = "/etc/pve/local/host.fw";
 716     if (my $fh = IO::File->new($filename, O_RDONLY)) {
 717         my $host_rules = parse_host_fw_rules($filename, $fh);
 718         enablehostfw($ruleset, $host_rules, $group_rules);
 719     }
 720
 721     # generate firewall rules for QEMU VMs
 722     foreach my $vmid (keys %{$vmdata->{qemu}}) {
 723         my $conf = $vmdata->{qemu}->{$vmid};
 724         next if !$rules->{$vmid};
 725
 726         foreach my $netid (keys %$conf) {
 727             next if $netid !~ m/^net(\d+)$/;
 728             my $net = PVE::QemuServer::parse_net($conf->{$netid});
 729             next if !$net;
 730             my $iface = "tap${vmid}i$1";
 731
 732             my $bridge = $net->{bridge};
 733             next if !$bridge; # fixme: ?
 734
 735             $bridge .= "v$net->{tag}" if $net->{tag};
 736
 737             generate_bridge_chains($ruleset, $bridge);
 738
 739             my $macaddr = $net->{macaddr};
 740             generate_tap_rules_direction($ruleset, $group_rules, $iface, $netid, $macaddr, $rules->{$vmid}->{in}, $bridge, 'IN');
 741             generate_tap_rules_direction($ruleset, $group_rules, $iface, $netid, $macaddr, $rules->{$vmid}->{out}, $bridge, 'OUT');
 742         }
 743     }
 744     return $ruleset;
 745 }
 746
 747 sub get_ruleset_status {
 748     my ($ruleset, $verbose) = @_;
 749
 750     my $active_chains = iptables_get_chains();
 751
 752     my $statushash = {};
 753
 754     foreach my $chain (sort keys %$ruleset) {
 755         my $digest = Digest::SHA->new('sha1');
 756         foreach my $cmd (@{$ruleset->{$chain}}) {
 757              $digest->add("$cmd\n");
 758         }
 759         my $sig = $digest->b64digest;
 760         $statushash->{$chain}->{sig} = $sig;
 761
 762         my $oldsig = $active_chains->{$chain};
 763         if (!defined($oldsig)) {
 764             $statushash->{$chain}->{action} = 'create';
 765         } else {
 766             if ($oldsig eq $sig) {
 767                 $statushash->{$chain}->{action} = 'exists';
 768             } else {
 769                 $statushash->{$chain}->{action} = 'update';
 770             }
 771         }
 772         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
 773         foreach my $cmd (@{$ruleset->{$chain}}) {
 774             print "\t$cmd\n" if $verbose;
 775         }
 776     }
 777
 778     foreach my $chain (sort keys %$active_chains) {
 779         if (!defined($ruleset->{$chain})) {
 780             my $sig = $active_chains->{$chain};
 781             $statushash->{$chain}->{action} = 'delete';
 782             $statushash->{$chain}->{sig} = $sig;
 783             print "delete $chain ($sig)\n" if $verbose;
 784         }
 785     }
 786
 787     return $statushash;
 788 }
 789
 790 sub print_ruleset {
 791     my ($ruleset) = @_;
 792
 793     get_ruleset_status($ruleset, 1);
 794 }
 795
 796 sub print_sig_rule {
 797     my ($chain, $sig) = @_;
 798
 799     # We just use this to store a SHA1 checksum used to detect changes
 800     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
 801 }
 802
 803 sub apply_ruleset {
 804     my ($ruleset, $verbose) = @_;
 805
 806     enable_bridge_firewall();
 807
 808     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
 809
 810     my $statushash = get_ruleset_status($ruleset, $verbose);
 811
 812     # create missing chains first
 813     foreach my $chain (sort keys %$ruleset) {
 814         my $stat = $statushash->{$chain};
 815         die "internal error" if !$stat;
 816         next if $stat->{action} ne 'create';
 817
 818         $cmdlist .= ":$chain - [0:0]\n";
 819     }
 820
 821     my $rule = "INPUT -j PVEFW-INPUT";
 822     if (!PVE::Firewall::iptables_rule_exist($rule)) {
 823         $cmdlist .= "-A $rule\n";
 824     }
 825     $rule = "OUTPUT -j PVEFW-OUTPUT";
 826     if (!PVE::Firewall::iptables_rule_exist($rule)) {
 827         $cmdlist .= "-A $rule\n";
 828     }
 829
 830     $rule = "FORWARD -j PVEFW-FORWARD";
 831     if (!PVE::Firewall::iptables_rule_exist($rule)) {
 832         $cmdlist .= "-A $rule\n";
 833     }
 834
 835     foreach my $chain (sort keys %$ruleset) {
 836         my $stat = $statushash->{$chain};
 837         die "internal error" if !$stat;
 838
 839         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
 840             $cmdlist .= "-F $chain\n";
 841             foreach my $cmd (@{$ruleset->{$chain}}) {
 842                 $cmdlist .= "$cmd\n";
 843             }
 844             $cmdlist .= print_sig_rule($chain, $stat->{sig});
 845         } elsif ($stat->{action} eq 'delete') {
 846             die "internal error"; # this should not happen
 847         } elsif ($stat->{action} eq 'exists') {
 848             # do nothing
 849         } else {
 850             die "internal error - unknown status '$stat->{action}'";
 851         }
 852     }
 853
 854     foreach my $chain (keys %$statushash) {
 855         next if $statushash->{$chain}->{action} ne 'delete';
 856         $cmdlist .= "-F $chain\n";
 857     }
 858     foreach my $chain (keys %$statushash) {
 859         next if $statushash->{$chain}->{action} ne 'delete';
 860         $cmdlist .= "-X $chain\n";
 861     }
 862
 863     $cmdlist .= "COMMIT\n";
 864
 865     print $cmdlist if $verbose;
 866
 867     iptables_restore_cmdlist($cmdlist);
 868
 869     # test: re-read status and check if everything is up to date
 870     $statushash = get_ruleset_status($ruleset);
 871
 872     my $errors;
 873     foreach my $chain (sort keys %$ruleset) {
 874         my $stat = $statushash->{$chain};
 875         if ($stat->{action} ne 'exists') {
 876             warn "unable to update chain '$chain'\n";
 877             $errors = 1;
 878         }
 879     }
 880
 881     die "unable to apply firewall changes\n" if $errors;
 882 }
 883
 884 1;