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