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 ($line =~ m/^-A\s+(\S+)\s.*--log-prefix\s+\"PVESIG:(\S+)\"/) {
203 my ($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, $chain) = @_;
261 die "chain '$chain' already exists\n" if $ruleset->{$chain};
263 $ruleset->{$chain} = [];
266 sub ruleset_chain_exist
{
267 my ($ruleset, $chain) = @_;
269 return $ruleset->{$chain} ?
1 : undef;
272 sub ruleset_addrule
{
273 my ($ruleset, $chain, $rule) = @_;
275 die "no such chain '$chain'\n" if !$ruleset->{$chain};
277 push @{$ruleset->{$chain}}, "-A $chain $rule";
280 sub ruleset_insertrule
{
281 my ($ruleset, $chain, $rule) = @_;
283 die "no such chain '$chain'\n" if !$ruleset->{$chain};
285 unshift @{$ruleset->{$chain}}, "-A $chain $rule";
288 sub generate_bridge_chains
{
289 my ($ruleset, $bridge) = @_;
291 if (!ruleset_chain_exist
($ruleset, "PVEFW-BRIDGE-IN")){
292 ruleset_create_chain
($ruleset, "PVEFW-BRIDGE-IN");
295 if (!ruleset_chain_exist
($ruleset, "PVEFW-BRIDGE-OUT")){
296 ruleset_create_chain
($ruleset, "PVEFW-BRIDGE-OUT");
299 if (!ruleset_chain_exist
($ruleset, "PVEFW-FORWARD")){
300 ruleset_create_chain
($ruleset, "PVEFW-FORWARD");
302 ruleset_addrule
($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");
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, "$bridge-IN", "-j ACCEPT");
314 if (!ruleset_chain_exist
($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 $bridge-OUT");
321 sub generate_tap_rules_direction
{
322 my ($ruleset, $iface, $netid, $macaddr, $rules, $bridge, $direction) = @_;
324 my $tapchain = "$iface-$direction";
326 ruleset_create_chain
($ruleset, $tapchain);
328 ruleset_addrule
($ruleset, $tapchain, "-m state --state INVALID -j DROP");
329 ruleset_addrule
($ruleset, $tapchain, "-m state --state RELATED,ESTABLISHED -j ACCEPT");
331 if ($direction eq 'OUT' && defined($macaddr)) {
332 ruleset_addrule
($ruleset, $tapchain, "-m mac ! --mac-source $macaddr -j DROP");
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);
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, $rule);
351 ruleset_addrule
($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-dropped: \" --log-level 4");
352 ruleset_addrule
($ruleset, $tapchain, "-j DROP");
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", $rule);
359 if ($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);
369 my $filename = "/etc/pve/local/host.fw";
370 my $fh = IO
::File-
>new($filename, O_RDONLY
);
373 my $rules = parse_fw_rules
($filename, $fh);
375 # host inbound firewall
376 my $chain = "PVEFW-HOST-IN";
377 ruleset_create_chain
($ruleset, $chain);
379 ruleset_addrule
($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
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, $rule);
394 ruleset_addrule
($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-IN dropped: \" --log-level 4");
395 ruleset_addrule
($ruleset, $chain, "-j DROP");
397 # host outbound firewall
398 my $chain = "PVEFW-HOST-OUT";
399 ruleset_create_chain
($ruleset, $chain);
401 ruleset_addrule
($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
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, $rule);
416 ruleset_addrule
($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-OUT dropped: \" --log-level 4");
417 ruleset_addrule
($ruleset, $chain, "-j DROP");
419 ruleset_addrule
($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
420 ruleset_addrule
($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
423 sub generate_group_rules
{
424 my ($ruleset, $group) = @_;
426 my $filename = "/etc/pve/firewall/groups.fw";
427 my $fh = IO
::File-
>new($filename, O_RDONLY
);
430 my $rules = parse_fw_rules
($filename, $fh, $group);
432 my $chain = "GROUP-${group}-IN";
434 ruleset_create_chain
($ruleset, $chain);
437 foreach my $rule (@{$rules->{in}}) {
438 ruleset_generate_rule
($ruleset, $chain, $rule);
442 $chain = "GROUP-${group}-OUT";
444 ruleset_create_chain
($ruleset, $chain);
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, $rule);
457 my ($filename, $fh, $group) = @_;
461 my $securitygroupexist;
463 my $res = { in => [], out
=> [] };
465 my $macros = get_firewall_macros
();
466 my $protocols = get_etc_protocols
();
468 while (defined(my $line = <$fh>)) {
469 next if $line =~ m/^#/;
470 next if $line =~ m/^\s*$/;
472 if ($line =~ m/^\[(in|out)(:(\S+))?\]\s*$/i) {
474 $securitygroup = lc($3) if $3;
475 $securitygroupexist = 1 if $securitygroup && $securitygroup eq $group;
479 next if $group && $securitygroup ne $group;
481 my ($action, $iface, $source, $dest, $proto, $dport, $sport) =
485 warn "skip incomplete line\n";
490 if ($action =~ m/^(ACCEPT|DROP|REJECT|GROUP-(\S+))$/) {
492 } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
493 ($service, $action) = ($1, $2);
494 if (!$macros->{$service}) {
495 warn "unknown service '$service'\n";
499 warn "unknown action '$action'\n";
503 $iface = undef if $iface && $iface eq '-';
504 if ($iface && $iface !~ m/^(net0|net1|net2|net3|net4|net5)$/) {
505 warn "unknown interface '$iface'\n";
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";
516 $source = undef if $source && $source eq '-';
517 $dest = undef if $dest && $dest eq '-';
519 $dport = undef if $dport && $dport eq '-';
520 $sport = undef if $sport && $sport eq '-';
523 my $nbsource = undef;
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;
545 nbsource
=> $nbsource,
555 push @{$res->{$section}}, $rule;
558 die "security group $group don't exist" if $group && !$securitygroupexist;
563 my ($code, @param) = @_;
567 my $res = lock_file
($pve_fw_lock_filename, $timeout, $code, @param);
574 sub read_local_vm_config
{
580 my $list = PVE
::QemuServer
::config_list
();
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;
589 my $vmdata = { openvz
=> $openvz, qemu
=> $qemu };
594 sub read_vm_firewall_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
);
602 $rules->{$vmid} = parse_fw_rules
($filename, $fh);
609 my $vmdata = read_local_vm_config
();
610 my $rules = read_vm_firewall_rules
($vmdata);
612 #print Dumper($rules);
616 # setup host firewall rules
617 ruleset_create_chain
($ruleset, "PVEFW-INPUT");
618 ruleset_create_chain
($ruleset, "PVEFW-OUTPUT");
620 enablehostfw
($ruleset);
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};
627 foreach my $netid (keys %$conf) {
628 next if $netid !~ m/^net(\d+)$/;
629 my $net = PVE
::QemuServer
::parse_net
($conf->{$netid});
631 my $iface = "tap${vmid}i$1";
633 my $bridge = $net->{bridge
};
634 next if !$bridge; # fixme: ?
636 $bridge .= "v$net->{tag}" if $net->{tag
};
638 generate_bridge_chains
($ruleset, $bridge);
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
}, $bridge, 'OUT');
648 sub get_ruleset_status
{
649 my ($ruleset, $verbose) = @_;
651 my $active_chains = iptables_get_chains
();
655 foreach my $chain (sort keys %$ruleset) {
656 my $digest = Digest
::MD5-
>new();
657 foreach my $cmd (@{$ruleset->{$chain}}) {
658 $digest->add("$cmd\n");
660 my $sig = $digest->b64digest;
661 $statushash->{$chain}->{sig
} = $sig;
663 my $oldsig = $active_chains->{$chain};
664 if (!defined($oldsig)) {
665 $statushash->{$chain}->{action
} = 'create';
667 if ($oldsig eq $sig) {
668 $statushash->{$chain}->{action
} = 'exists';
670 $statushash->{$chain}->{action
} = 'update';
673 print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
674 foreach my $cmd (@{$ruleset->{$chain}}) {
675 print "\t$cmd\n" if $verbose;
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 $verbose;
694 get_ruleset_status
($ruleset, 1);
698 my ($chain, $sig) = @_;
700 # Note: This rule should never match! We just use this hack to store a SHA1 checksum
701 # used to detect changes
702 return "-A $chain -j LOG --log-prefix \"PVESIG:$sig\" -p tcp
-s
\"127.128.129.130\" --dport
1\n";
705 sub compile_and_start {
708 my $ruleset = compile();
710 my $cmdlist = "*filter
\n"; # we pass this to iptables-restore;
712 my $statushash = get_ruleset_status($ruleset, $verbose);
714 # create missing chains first
715 foreach my $chain (sort keys %$ruleset) {
716 my $stat = $statushash->{$chain};
717 die "internal error
" if !$stat;
718 next if $stat->{action} ne 'create';
720 $cmdlist .= ":$chain - [0:0]\n";
723 my $rule = "INPUT
-j PVEFW-INPUT
";
724 if (!PVE::Firewall::iptables_rule_exist($rule)) {
725 $cmdlist .= "-A
$rule\n";
727 $rule = "OUTPUT
-j PVEFW-OUTPUT
";
728 if (!PVE::Firewall::iptables_rule_exist($rule)) {
729 $cmdlist .= "-A
$rule\n";
732 $rule = "FORWARD
-j PVEFW-FORWARD
";
733 if (!PVE::Firewall::iptables_rule_exist($rule)) {
734 $cmdlist .= "-A
$rule\n";
737 foreach my $chain (sort keys %$ruleset) {
738 my $stat = $statushash->{$chain};
739 die "internal error
" if !$stat;
741 if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
742 $cmdlist .= "-F
$chain\n";
743 foreach my $cmd (@{$ruleset->{$chain}}) {
744 $cmdlist .= "$cmd\n";
746 $cmdlist .= print_sig_rule($chain, $stat->{sig});
747 } elsif ($stat->{action} eq 'delete') {
748 $cmdlist .= "-F
$chain\n";
749 $cmdlist .= "-X
$chain\n";
750 } elsif ($stat->{action} eq 'exists') {
753 die "internal error
- unknown status
'$stat->{action}'";
757 $cmdlist .= "COMMIT
\n";
759 print $cmdlist if $verbose;
761 iptables_restore_cmdlist($cmdlist);
763 # test: re-read status and check if everything is up to date
764 $statushash = get_ruleset_status($ruleset);
767 foreach my $chain (sort keys %$ruleset) {
768 my $stat = $statushash->{$chain};
769 if ($stat->{action} ne 'exists') {
770 warn "unable to update chain
'$chain'\n";
775 die "unable to apply firewall changes
\n" if $errors;