12 use PVE
::Tools
qw(run_command lock_file);
16 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
20 # todo: implement some kind of MACROS, like shorewall /usr/share/shorewall/macro.*
21 sub get_firewall_macros
{
23 return $macros if $macros;
25 #foreach my $path (</usr/share/shorewall/macro.*>) {
26 # if ($path =~ m|/macro\.(\S+)$|) {
31 $macros = {}; # fixme: implemet me
38 sub get_etc_services
{
40 return $etc_services if $etc_services;
42 my $filename = "/etc/services";
44 my $fh = IO
::File-
>new($filename, O_RDONLY
);
46 warn "unable to read '$filename' - $!\n";
52 while (my $line = <$fh>) {
54 next if $line =~m/^#/;
55 next if ($line =~m/^\s*$/);
57 if ($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};
66 $etc_services = $services;
74 sub get_etc_protocols
{
75 return $etc_protocols if $etc_protocols;
77 my $filename = "/etc/protocols";
79 my $fh = IO
::File-
>new($filename, O_RDONLY
);
81 warn "unable to read '$filename' - $!\n";
87 while (my $line = <$fh>) {
89 next if $line =~m/^#/;
90 next if ($line =~m/^\s*$/);
92 if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
93 $protocols->{byid
}->{$2}->{name
} = $1;
94 $protocols->{byname
}->{$1} = $protocols->{byid
}->{$2};
100 $etc_protocols = $protocols;
102 return $etc_protocols;
105 sub parse_address_list
{
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";
120 sub parse_port_name_number_or_range
{
123 my $services = PVE
::Firewall
::get_etc_services
();
125 foreach my $item (split(/,/, $str)) {
127 foreach my $pon (split(':', $item, 2)) {
128 if ($pon =~ m/^\d+$/){
129 die "invalid port '$pon'\n" if $pon < 0 && $pon > 65536;
131 die "invalid port $services->{byname}->{$pon}\n" if !$services->{byname
}->{$pon};
140 my $bridge_firewall_enabled = 0;
142 sub enable_bridge_firewall
{
144 return if $bridge_firewall_enabled; # only once
146 system("echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables");
147 system("echo 1 > /proc/sys/net/bridge/bridge-nf-call-ip6tables");
149 $bridge_firewall_enabled = 1;
152 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
157 run_command
("/sbin/iptables $cmd", outfunc
=> sub {}, errfunc
=> sub {});
160 sub iptables_restore_cmdlist
{
163 run_command
("/sbin/iptables-restore -n", input
=> $cmdlist);
166 sub iptables_get_chains
{
170 # check what chains we want to track
171 my $is_pvefw_chain = sub {
174 return 1 if $name =~ m/^PVEFW-\S+$/;
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 $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/;
188 return if $line =~ m/^#/;
189 return if $line =~ m/^\s*$/;
191 if ($line =~ m/^\*(\S+)$/) {
196 return if $table ne 'filter';
198 if ($line =~ m/^:(\S+)\s/) {
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;
207 # simply ignore the rest
212 run_command
("/sbin/iptables-save", outfunc
=> $parser);
217 sub iptables_chain_exist
{
221 iptables
("-n --list $chain");
228 sub iptables_rule_exist
{
232 iptables
("-C $rule");
239 sub ruleset_generate_rule
{
240 my ($ruleset, $chain, $rule) = @_;
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 $rule->{action
};
255 ruleset_addrule
($ruleset, $chain, $cmd) if $cmd;
258 sub ruleset_create_chain
{
259 my ($ruleset, $chain) = @_;
261 die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
263 die "chain '$chain' already exists\n" if $ruleset->{$chain};
265 $ruleset->{$chain} = [];
268 sub ruleset_chain_exist
{
269 my ($ruleset, $chain) = @_;
271 return $ruleset->{$chain} ?
1 : undef;
274 sub ruleset_addrule
{
275 my ($ruleset, $chain, $rule) = @_;
277 die "no such chain '$chain'\n" if !$ruleset->{$chain};
279 push @{$ruleset->{$chain}}, "-A $chain $rule";
282 sub ruleset_insertrule
{
283 my ($ruleset, $chain, $rule) = @_;
285 die "no such chain '$chain'\n" if !$ruleset->{$chain};
287 unshift @{$ruleset->{$chain}}, "-A $chain $rule";
290 sub generate_bridge_chains
{
291 my ($ruleset, $bridge) = @_;
293 if (!ruleset_chain_exist
($ruleset, "PVEFW-BRIDGE-IN")){
294 ruleset_create_chain
($ruleset, "PVEFW-BRIDGE-IN");
297 if (!ruleset_chain_exist
($ruleset, "PVEFW-BRIDGE-OUT")){
298 ruleset_create_chain
($ruleset, "PVEFW-BRIDGE-OUT");
301 if (!ruleset_chain_exist
($ruleset, "PVEFW-FORWARD")){
302 ruleset_create_chain
($ruleset, "PVEFW-FORWARD");
304 ruleset_addrule
($ruleset, "PVEFW-FORWARD", "-m state --state RELATED,ESTABLISHED -j ACCEPT");
305 ruleset_addrule
($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-in --physdev-is-bridged -j PVEFW-BRIDGE-OUT");
306 ruleset_addrule
($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-out --physdev-is-bridged -j PVEFW-BRIDGE-IN");
309 if (!ruleset_chain_exist
($ruleset, "$bridge-IN")) {
310 ruleset_create_chain
($ruleset, "$bridge-IN");
311 ruleset_addrule
($ruleset, "PVEFW-FORWARD", "-i $bridge -j DROP"); # disable interbridge routing
312 ruleset_addrule
($ruleset, "PVEFW-BRIDGE-IN", "-j $bridge-IN");
313 ruleset_addrule
($ruleset, "$bridge-IN", "-j ACCEPT");
316 if (!ruleset_chain_exist
($ruleset, "$bridge-OUT")) {
317 ruleset_create_chain
($ruleset, "$bridge-OUT");
318 ruleset_addrule
($ruleset, "PVEFW-FORWARD", "-o $bridge -j DROP"); # disable interbridge routing
319 ruleset_addrule
($ruleset, "PVEFW-BRIDGE-OUT", "-j $bridge-OUT");
323 sub generate_tap_rules_direction
{
324 my ($ruleset, $iface, $netid, $macaddr, $rules, $bridge, $direction) = @_;
326 my $tapchain = "$iface-$direction";
328 ruleset_create_chain
($ruleset, $tapchain);
330 ruleset_addrule
($ruleset, $tapchain, "-m state --state INVALID -j DROP");
331 ruleset_addrule
($ruleset, $tapchain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
333 if ($direction eq 'OUT' && defined($macaddr)) {
334 ruleset_addrule
($ruleset, $tapchain, "-m mac ! --mac-source $macaddr -j DROP");
338 foreach my $rule (@$rules) {
339 next if $rule->{iface
} && $rule->{iface
} ne $netid;
340 if($rule->{action
} =~ m/^(GROUP-(\S+))$/){
341 $rule->{action
} .= "-$direction";
342 # generate empty group rule if don't exist
343 if(!ruleset_chain_exist
($ruleset, $rule->{action
})){
344 generate_group_rules
($ruleset, $2);
347 # we go to vmbr-IN if accept in out rules
348 $rule->{action
} = "$bridge-IN" if $rule->{action
} eq 'ACCEPT' && $direction eq 'OUT';
349 ruleset_generate_rule
($ruleset, $tapchain, $rule);
353 ruleset_addrule
($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-dropped: \" --log-level 4");
354 ruleset_addrule
($ruleset, $tapchain, "-j DROP");
356 # plug the tap chain to bridge chain
357 my $physdevdirection = $direction eq 'IN' ?
"out" : "in";
358 my $rule = "-m physdev --physdev-$physdevdirection $iface --physdev-is-bridged -j $tapchain";
359 ruleset_insertrule
($ruleset, "$bridge-$direction", $rule);
361 if ($direction eq 'OUT'){
362 # add tap->host rules
363 my $rule = "-m physdev --physdev-$physdevdirection $iface -j $tapchain";
364 ruleset_addrule
($ruleset, "PVEFW-INPUT", $rule);
371 my $filename = "/etc/pve/local/host.fw";
372 my $fh = IO
::File-
>new($filename, O_RDONLY
);
375 my $rules = parse_fw_rules
($filename, $fh);
377 # host inbound firewall
378 my $chain = "PVEFW-HOST-IN";
379 ruleset_create_chain
($ruleset, $chain);
381 ruleset_addrule
($ruleset, $chain, "-m state --state INVALID -j DROP");
382 ruleset_addrule
($ruleset, $chain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
383 ruleset_addrule
($ruleset, $chain, "-i lo -j ACCEPT");
384 ruleset_addrule
($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
385 ruleset_addrule
($ruleset, $chain, "-p udp -m state --state NEW -m multiport --dports 5404,5405 -j ACCEPT");
386 ruleset_addrule
($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
389 foreach my $rule (@{$rules->{in}}) {
390 # we use RETURN because we need to check also tap rules
391 $rule->{action
} = 'RETURN' if $rule->{action
} eq 'ACCEPT';
392 ruleset_generate_rule
($ruleset, $chain, $rule);
396 ruleset_addrule
($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-IN dropped: \" --log-level 4");
397 ruleset_addrule
($ruleset, $chain, "-j DROP");
399 # host outbound firewall
400 $chain = "PVEFW-HOST-OUT";
401 ruleset_create_chain
($ruleset, $chain);
403 ruleset_addrule
($ruleset, $chain, "-m state --state INVALID -j DROP");
404 ruleset_addrule
($ruleset, $chain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
405 ruleset_addrule
($ruleset, $chain, "-o lo -j ACCEPT");
406 ruleset_addrule
($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
407 ruleset_addrule
($ruleset, $chain, "-p udp -m state --state NEW -m multiport --dports 5404,5405 -j ACCEPT");
408 ruleset_addrule
($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
411 foreach my $rule (@{$rules->{out
}}) {
412 # we use RETURN because we need to check also tap rules
413 $rule->{action
} = 'RETURN' if $rule->{action
} eq 'ACCEPT';
414 ruleset_generate_rule
($ruleset, $chain, $rule);
418 ruleset_addrule
($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-OUT dropped: \" --log-level 4");
419 ruleset_addrule
($ruleset, $chain, "-j DROP");
421 ruleset_addrule
($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
422 ruleset_addrule
($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
425 sub generate_group_rules
{
426 my ($ruleset, $group) = @_;
428 my $filename = "/etc/pve/firewall/groups.fw";
429 my $fh = IO
::File-
>new($filename, O_RDONLY
);
432 my $rules = parse_fw_rules
($filename, $fh, $group);
434 my $chain = "GROUP-${group}-IN";
436 ruleset_create_chain
($ruleset, $chain);
439 foreach my $rule (@{$rules->{in}}) {
440 ruleset_generate_rule
($ruleset, $chain, $rule);
444 $chain = "GROUP-${group}-OUT";
446 ruleset_create_chain
($ruleset, $chain);
449 foreach my $rule (@{$rules->{out
}}) {
450 # we go the PVEFW-BRIDGE-IN because we need to check also other tap rules
451 # (and group rules can be set on any bridge, so we can't go to VMBRXX-IN)
452 $rule->{action
} = 'PVEFW-BRIDGE-IN' if $rule->{action
} eq 'ACCEPT';
453 ruleset_generate_rule
($ruleset, $chain, $rule);
459 my ($filename, $fh, $group) = @_;
463 my $securitygroupexist;
465 my $res = { in => [], out
=> [] };
467 my $macros = get_firewall_macros
();
468 my $protocols = get_etc_protocols
();
470 while (defined(my $line = <$fh>)) {
471 next if $line =~ m/^#/;
472 next if $line =~ m/^\s*$/;
474 if ($line =~ m/^\[(in|out)(:(\S+))?\]\s*$/i) {
476 $securitygroup = lc($3) if $3;
477 $securitygroupexist = 1 if $securitygroup && $securitygroup eq $group;
481 next if $group && $securitygroup ne $group;
483 my ($action, $iface, $source, $dest, $proto, $dport, $sport) =
487 warn "skip incomplete line\n";
492 if ($action =~ m/^(ACCEPT|DROP|REJECT|GROUP-(\S+))$/) {
494 } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
495 ($service, $action) = ($1, $2);
496 if (!$macros->{$service}) {
497 warn "unknown service '$service'\n";
501 warn "unknown action '$action'\n";
505 $iface = undef if $iface && $iface eq '-';
506 if ($iface && $iface !~ m/^(net0|net1|net2|net3|net4|net5)$/) {
507 warn "unknown interface '$iface'\n";
511 $proto = undef if $proto && $proto eq '-';
512 if ($proto && !(defined($protocols->{byname
}->{$proto}) ||
513 defined($protocols->{byid
}->{$proto}))) {
514 warn "unknown protokol '$proto'\n";
518 $source = undef if $source && $source eq '-';
519 $dest = undef if $dest && $dest eq '-';
521 $dport = undef if $dport && $dport eq '-';
522 $sport = undef if $sport && $sport eq '-';
525 my $nbsource = undef;
529 $nbsource = parse_address_list
($source) if $source;
530 $nbdest = parse_address_list
($dest) if $dest;
531 $nbdport = parse_port_name_number_or_range
($dport) if $dport;
532 $nbsport = parse_port_name_number_or_range
($sport) if $sport;
547 nbsource
=> $nbsource,
557 push @{$res->{$section}}, $rule;
560 die "security group $group don't exist" if $group && !$securitygroupexist;
565 my ($code, @param) = @_;
569 my $res = lock_file
($pve_fw_lock_filename, $timeout, $code, @param);
576 sub read_local_vm_config
{
582 my $list = PVE
::QemuServer
::config_list
();
584 foreach my $vmid (keys %$list) {
585 my $cfspath = PVE
::QemuServer
::cfs_config_path
($vmid);
586 if (my $conf = PVE
::Cluster
::cfs_read_file
($cfspath)) {
587 $qemu->{$vmid} = $conf;
591 my $vmdata = { openvz
=> $openvz, qemu
=> $qemu };
596 sub read_vm_firewall_rules
{
599 foreach my $vmid (keys %{$vmdata->{qemu
}}, keys %{$vmdata->{openvz
}}) {
600 my $filename = "/etc/pve/firewall/$vmid.fw";
601 my $fh = IO
::File-
>new($filename, O_RDONLY
);
604 $rules->{$vmid} = parse_fw_rules
($filename, $fh);
611 my $vmdata = read_local_vm_config
();
612 my $rules = read_vm_firewall_rules
($vmdata);
614 #print Dumper($rules);
618 # setup host firewall rules
619 ruleset_create_chain
($ruleset, "PVEFW-INPUT");
620 ruleset_create_chain
($ruleset, "PVEFW-OUTPUT");
622 enablehostfw
($ruleset);
624 # generate firewall rules for QEMU VMs
625 foreach my $vmid (keys %{$vmdata->{qemu
}}) {
626 my $conf = $vmdata->{qemu
}->{$vmid};
627 next if !$rules->{$vmid};
629 foreach my $netid (keys %$conf) {
630 next if $netid !~ m/^net(\d+)$/;
631 my $net = PVE
::QemuServer
::parse_net
($conf->{$netid});
633 my $iface = "tap${vmid}i$1";
635 my $bridge = $net->{bridge
};
636 next if !$bridge; # fixme: ?
638 $bridge .= "v$net->{tag}" if $net->{tag
};
640 generate_bridge_chains
($ruleset, $bridge);
642 my $macaddr = $net->{macaddr
};
643 generate_tap_rules_direction
($ruleset, $iface, $netid, $macaddr, $rules->{$vmid}->{in}, $bridge, 'IN');
644 generate_tap_rules_direction
($ruleset, $iface, $netid, $macaddr, $rules->{$vmid}->{out
}, $bridge, 'OUT');
650 sub get_ruleset_status
{
651 my ($ruleset, $verbose) = @_;
653 my $active_chains = iptables_get_chains
();
657 foreach my $chain (sort keys %$ruleset) {
658 my $digest = Digest
::SHA-
>new('sha1');
659 foreach my $cmd (@{$ruleset->{$chain}}) {
660 $digest->add("$cmd\n");
662 my $sig = $digest->b64digest;
663 $statushash->{$chain}->{sig
} = $sig;
665 my $oldsig = $active_chains->{$chain};
666 if (!defined($oldsig)) {
667 $statushash->{$chain}->{action
} = 'create';
669 if ($oldsig eq $sig) {
670 $statushash->{$chain}->{action
} = 'exists';
672 $statushash->{$chain}->{action
} = 'update';
675 print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
676 foreach my $cmd (@{$ruleset->{$chain}}) {
677 print "\t$cmd\n" if $verbose;
681 foreach my $chain (sort keys %$active_chains) {
682 if (!defined($ruleset->{$chain})) {
683 my $sig = $active_chains->{$chain};
684 $statushash->{$chain}->{action
} = 'delete';
685 $statushash->{$chain}->{sig
} = $sig;
686 print "delete $chain ($sig)\n" if $verbose;
696 get_ruleset_status
($ruleset, 1);
700 my ($chain, $sig) = @_;
702 # We just use this to store a SHA1 checksum used to detect changes
703 return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
707 my ($ruleset, $verbose) = @_;
709 enable_bridge_firewall();
711 my $cmdlist = "*filter
\n"; # we pass this to iptables-restore;
713 my $statushash = get_ruleset_status($ruleset, $verbose);
715 # create missing chains first
716 foreach my $chain (sort keys %$ruleset) {
717 my $stat = $statushash->{$chain};
718 die "internal error
" if !$stat;
719 next if $stat->{action} ne 'create';
721 $cmdlist .= ":$chain - [0:0]\n";
724 my $rule = "INPUT
-j PVEFW-INPUT
";
725 if (!PVE::Firewall::iptables_rule_exist($rule)) {
726 $cmdlist .= "-A
$rule\n";
728 $rule = "OUTPUT
-j PVEFW-OUTPUT
";
729 if (!PVE::Firewall::iptables_rule_exist($rule)) {
730 $cmdlist .= "-A
$rule\n";
733 $rule = "FORWARD
-j PVEFW-FORWARD
";
734 if (!PVE::Firewall::iptables_rule_exist($rule)) {
735 $cmdlist .= "-A
$rule\n";
738 foreach my $chain (sort keys %$ruleset) {
739 my $stat = $statushash->{$chain};
740 die "internal error
" if !$stat;
742 if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
743 $cmdlist .= "-F
$chain\n";
744 foreach my $cmd (@{$ruleset->{$chain}}) {
745 $cmdlist .= "$cmd\n";
747 $cmdlist .= print_sig_rule($chain, $stat->{sig});
748 } elsif ($stat->{action} eq 'delete') {
749 $cmdlist .= "-F
$chain\n";
750 $cmdlist .= "-X
$chain\n";
751 } elsif ($stat->{action} eq 'exists') {
754 die "internal error
- unknown status
'$stat->{action}'";
758 $cmdlist .= "COMMIT
\n";
760 print $cmdlist if $verbose;
762 iptables_restore_cmdlist($cmdlist);
764 # test: re-read status and check if everything is up to date
765 $statushash = get_ruleset_status($ruleset);
768 foreach my $chain (sort keys %$ruleset) {
769 my $stat = $statushash->{$chain};
770 if ($stat->{action} ne 'exists') {
771 warn "unable to update chain
'$chain'\n";
776 die "unable to apply firewall changes
\n" if $errors;