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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 | # todo: define more MACROS | |
19 | # inspired by: /usr/share/shorewall/macro.* | |
20 | my $pve_fw_macros = { | |
21 | BitTorrent => [ | |
22 | { action => 'PARAM', proto => 'tcp', dport => '6881:6889' }, | |
23 | { action => 'PARAM', proto => 'udp', dport => '6881' } | |
24 | ], | |
25 | HTTP => [ | |
26 | { action => 'PARAM', proto => 'tcp', dport => '80' }, | |
27 | ], | |
28 | HTTPS => [ | |
29 | { action => 'PARAM', proto => 'tcp', dport => '443' }, | |
30 | ], | |
31 | }; | |
32 | ||
33 | my $pve_fw_parsed_macros; | |
34 | my $pve_fw_preferred_macro_names = {}; | |
35 | ||
36 | sub get_firewall_macros { | |
37 | ||
38 | return $pve_fw_parsed_macros if $pve_fw_parsed_macros; | |
39 | ||
40 | $pve_fw_parsed_macros = {}; | |
41 | ||
42 | foreach my $k (keys %$pve_fw_macros) { | |
43 | my $name = lc($k); | |
44 | ||
45 | my $macro = $pve_fw_macros->{$k}; | |
46 | $pve_fw_preferred_macro_names->{$name} = $k; | |
47 | $pve_fw_parsed_macros->{$name} = $macro; | |
48 | } | |
49 | ||
50 | return $pve_fw_parsed_macros; | |
51 | } | |
52 | ||
53 | my $etc_services; | |
54 | ||
55 | sub get_etc_services { | |
56 | ||
57 | return $etc_services if $etc_services; | |
58 | ||
59 | my $filename = "/etc/services"; | |
60 | ||
61 | my $fh = IO::File->new($filename, O_RDONLY); | |
62 | if (!$fh) { | |
63 | warn "unable to read '$filename' - $!\n"; | |
64 | return {}; | |
65 | } | |
66 | ||
67 | my $services = {}; | |
68 | ||
69 | while (my $line = <$fh>) { | |
70 | chomp ($line); | |
71 | next if $line =~m/^#/; | |
72 | next if ($line =~m/^\s*$/); | |
73 | ||
74 | if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp).*$!) { | |
75 | $services->{byid}->{$2}->{name} = $1; | |
76 | $services->{byid}->{$2}->{$3} = 1; | |
77 | $services->{byname}->{$1} = $services->{byid}->{$2}; | |
78 | } | |
79 | } | |
80 | ||
81 | close($fh); | |
82 | ||
83 | $etc_services = $services; | |
84 | ||
85 | ||
86 | return $etc_services; | |
87 | } | |
88 | ||
89 | my $etc_protocols; | |
90 | ||
91 | sub get_etc_protocols { | |
92 | return $etc_protocols if $etc_protocols; | |
93 | ||
94 | my $filename = "/etc/protocols"; | |
95 | ||
96 | my $fh = IO::File->new($filename, O_RDONLY); | |
97 | if (!$fh) { | |
98 | warn "unable to read '$filename' - $!\n"; | |
99 | return {}; | |
100 | } | |
101 | ||
102 | my $protocols = {}; | |
103 | ||
104 | while (my $line = <$fh>) { | |
105 | chomp ($line); | |
106 | next if $line =~m/^#/; | |
107 | next if ($line =~m/^\s*$/); | |
108 | ||
109 | if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) { | |
110 | $protocols->{byid}->{$2}->{name} = $1; | |
111 | $protocols->{byname}->{$1} = $protocols->{byid}->{$2}; | |
112 | } | |
113 | } | |
114 | ||
115 | close($fh); | |
116 | ||
117 | $etc_protocols = $protocols; | |
118 | ||
119 | return $etc_protocols; | |
120 | } | |
121 | ||
122 | sub parse_address_list { | |
123 | my ($str) = @_; | |
124 | ||
125 | my $nbaor = 0; | |
126 | foreach my $aor (split(/,/, $str)) { | |
127 | if (!Net::IP->new($aor)) { | |
128 | my $err = Net::IP::Error(); | |
129 | die "invalid IP address: $err\n"; | |
130 | }else{ | |
131 | $nbaor++; | |
132 | } | |
133 | } | |
134 | return $nbaor; | |
135 | } | |
136 | ||
137 | sub parse_port_name_number_or_range { | |
138 | my ($str) = @_; | |
139 | ||
140 | my $services = PVE::Firewall::get_etc_services(); | |
141 | my $nbports = 0; | |
142 | foreach my $item (split(/,/, $str)) { | |
143 | my $portlist = ""; | |
144 | foreach my $pon (split(':', $item, 2)) { | |
145 | if ($pon =~ m/^\d+$/){ | |
146 | die "invalid port '$pon'\n" if $pon < 0 && $pon > 65536; | |
147 | }else{ | |
148 | die "invalid port $services->{byname}->{$pon}\n" if !$services->{byname}->{$pon}; | |
149 | } | |
150 | $nbports++; | |
151 | } | |
152 | } | |
153 | ||
154 | return ($nbports); | |
155 | } | |
156 | ||
157 | my $bridge_firewall_enabled = 0; | |
158 | ||
159 | sub enable_bridge_firewall { | |
160 | ||
161 | return if $bridge_firewall_enabled; # only once | |
162 | ||
163 | system("echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables"); | |
164 | system("echo 1 > /proc/sys/net/bridge/bridge-nf-call-ip6tables"); | |
165 | ||
166 | $bridge_firewall_enabled = 1; | |
167 | } | |
168 | ||
169 | my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n"; | |
170 | ||
171 | sub iptables { | |
172 | my ($cmd) = @_; | |
173 | ||
174 | run_command("/sbin/iptables $cmd", outfunc => sub {}, errfunc => sub {}); | |
175 | } | |
176 | ||
177 | sub iptables_restore_cmdlist { | |
178 | my ($cmdlist) = @_; | |
179 | ||
180 | run_command("/sbin/iptables-restore -n", input => $cmdlist); | |
181 | } | |
182 | ||
183 | sub iptables_get_chains { | |
184 | ||
185 | my $res = {}; | |
186 | ||
187 | # check what chains we want to track | |
188 | my $is_pvefw_chain = sub { | |
189 | my $name = shift; | |
190 | ||
191 | return 1 if $name =~ m/^PVEFW-\S+$/; | |
192 | ||
193 | return 1 if $name =~ m/^tap\d+i\d+-(:?IN|OUT)$/; | |
194 | return 1 if $name =~ m/^vmbr\d+-(:?IN|OUT)$/; | |
195 | return 1 if $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/; | |
196 | ||
197 | return undef; | |
198 | }; | |
199 | ||
200 | my $table = ''; | |
201 | ||
202 | my $parser = sub { | |
203 | my $line = shift; | |
204 | ||
205 | return if $line =~ m/^#/; | |
206 | return if $line =~ m/^\s*$/; | |
207 | ||
208 | if ($line =~ m/^\*(\S+)$/) { | |
209 | $table = $1; | |
210 | return; | |
211 | } | |
212 | ||
213 | return if $table ne 'filter'; | |
214 | ||
215 | if ($line =~ m/^:(\S+)\s/) { | |
216 | my $chain = $1; | |
217 | return if !&$is_pvefw_chain($chain); | |
218 | $res->{$chain} = "unknown"; | |
219 | } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) { | |
220 | my ($chain, $sig) = ($1, $2); | |
221 | return if !&$is_pvefw_chain($chain); | |
222 | $res->{$chain} = $sig; | |
223 | } else { | |
224 | # simply ignore the rest | |
225 | return; | |
226 | } | |
227 | }; | |
228 | ||
229 | run_command("/sbin/iptables-save", outfunc => $parser); | |
230 | ||
231 | return $res; | |
232 | } | |
233 | ||
234 | sub iptables_chain_exist { | |
235 | my ($chain) = @_; | |
236 | ||
237 | eval{ | |
238 | iptables("-n --list $chain"); | |
239 | }; | |
240 | return undef if $@; | |
241 | ||
242 | return 1; | |
243 | } | |
244 | ||
245 | sub iptables_rule_exist { | |
246 | my ($rule) = @_; | |
247 | ||
248 | eval{ | |
249 | iptables("-C $rule"); | |
250 | }; | |
251 | return undef if $@; | |
252 | ||
253 | return 1; | |
254 | } | |
255 | ||
256 | sub ruleset_generate_rule { | |
257 | my ($ruleset, $chain, $rule, $goto) = @_; | |
258 | ||
259 | my $cmd = ''; | |
260 | ||
261 | $cmd .= " -m iprange --src-range" if $rule->{nbsource} && $rule->{nbsource} > 1; | |
262 | $cmd .= " -s $rule->{source}" if $rule->{source}; | |
263 | $cmd .= " -m iprange --dst-range" if $rule->{nbdest} && $rule->{nbdest} > 1; | |
264 | $cmd .= " -d $rule->{dest}" if $rule->{dest}; | |
265 | $cmd .= " -p $rule->{proto}" if $rule->{proto}; | |
266 | $cmd .= " --match multiport" if $rule->{nbdport} && $rule->{nbdport} > 1; | |
267 | $cmd .= " --dport $rule->{dport}" if $rule->{dport}; | |
268 | $cmd .= " --match multiport" if $rule->{nbsport} && $rule->{nbsport} > 1; | |
269 | $cmd .= " --sport $rule->{sport}" if $rule->{sport}; | |
270 | ||
271 | if (my $action = $rule->{action}) { | |
272 | $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK'; | |
273 | $cmd .= $goto ? " -g $action" : " -j $action"; | |
274 | }; | |
275 | ||
276 | ruleset_addrule($ruleset, $chain, $cmd) if $cmd; | |
277 | } | |
278 | ||
279 | sub ruleset_create_chain { | |
280 | my ($ruleset, $chain) = @_; | |
281 | ||
282 | die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28; | |
283 | ||
284 | die "chain '$chain' already exists\n" if $ruleset->{$chain}; | |
285 | ||
286 | $ruleset->{$chain} = []; | |
287 | } | |
288 | ||
289 | sub ruleset_chain_exist { | |
290 | my ($ruleset, $chain) = @_; | |
291 | ||
292 | return $ruleset->{$chain} ? 1 : undef; | |
293 | } | |
294 | ||
295 | sub ruleset_addrule { | |
296 | my ($ruleset, $chain, $rule) = @_; | |
297 | ||
298 | die "no such chain '$chain'\n" if !$ruleset->{$chain}; | |
299 | ||
300 | push @{$ruleset->{$chain}}, "-A $chain $rule"; | |
301 | } | |
302 | ||
303 | sub ruleset_insertrule { | |
304 | my ($ruleset, $chain, $rule) = @_; | |
305 | ||
306 | die "no such chain '$chain'\n" if !$ruleset->{$chain}; | |
307 | ||
308 | unshift @{$ruleset->{$chain}}, "-A $chain $rule"; | |
309 | } | |
310 | ||
311 | sub generate_bridge_chains { | |
312 | my ($ruleset, $bridge) = @_; | |
313 | ||
314 | if (!ruleset_chain_exist($ruleset, "PVEFW-BRIDGE-IN")){ | |
315 | ruleset_create_chain($ruleset, "PVEFW-BRIDGE-IN"); | |
316 | } | |
317 | ||
318 | if (!ruleset_chain_exist($ruleset, "PVEFW-BRIDGE-OUT")){ | |
319 | ruleset_create_chain($ruleset, "PVEFW-BRIDGE-OUT"); | |
320 | } | |
321 | ||
322 | if (!ruleset_chain_exist($ruleset, "PVEFW-FORWARD")){ | |
323 | ruleset_create_chain($ruleset, "PVEFW-FORWARD"); | |
324 | ||
325 | ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m state --state RELATED,ESTABLISHED -j ACCEPT"); | |
326 | ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-in --physdev-is-bridged -j PVEFW-BRIDGE-OUT"); | |
327 | ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-out --physdev-is-bridged -j PVEFW-BRIDGE-IN"); | |
328 | } | |
329 | ||
330 | if (!ruleset_chain_exist($ruleset, "$bridge-IN")) { | |
331 | ruleset_create_chain($ruleset, "$bridge-IN"); | |
332 | ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -j DROP"); # disable interbridge routing | |
333 | ruleset_addrule($ruleset, "PVEFW-BRIDGE-IN", "-j $bridge-IN"); | |
334 | ruleset_addrule($ruleset, "$bridge-IN", "-j ACCEPT"); | |
335 | } | |
336 | ||
337 | if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) { | |
338 | ruleset_create_chain($ruleset, "$bridge-OUT"); | |
339 | ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -j DROP"); # disable interbridge routing | |
340 | ruleset_addrule($ruleset, "PVEFW-BRIDGE-OUT", "-j $bridge-OUT"); | |
341 | } | |
342 | } | |
343 | ||
344 | sub generate_tap_rules_direction { | |
345 | my ($ruleset, $group_rules, $iface, $netid, $macaddr, $rules, $bridge, $direction) = @_; | |
346 | ||
347 | my $tapchain = "$iface-$direction"; | |
348 | ||
349 | ruleset_create_chain($ruleset, $tapchain); | |
350 | ||
351 | ruleset_addrule($ruleset, $tapchain, "-m state --state INVALID -j DROP"); | |
352 | ruleset_addrule($ruleset, $tapchain, "-m state --state RELATED,ESTABLISHED -j ACCEPT"); | |
353 | ||
354 | if ($direction eq 'OUT' && defined($macaddr)) { | |
355 | ruleset_addrule($ruleset, $tapchain, "-m mac ! --mac-source $macaddr -j DROP"); | |
356 | } | |
357 | ||
358 | if ($rules) { | |
359 | foreach my $rule (@$rules) { | |
360 | next if $rule->{iface} && $rule->{iface} ne $netid; | |
361 | # we go to $bridge-IN if accept in out rules | |
362 | if($rule->{action} =~ m/^(GROUP-(\S+))$/){ | |
363 | $rule->{action} .= "-$direction"; | |
364 | # generate empty group rule if don't exist | |
365 | if(!ruleset_chain_exist($ruleset, $rule->{action})){ | |
366 | generate_group_rules($ruleset, $group_rules, $2); | |
367 | } | |
368 | ruleset_generate_rule($ruleset, $tapchain, $rule); | |
369 | ruleset_addrule($ruleset, $tapchain, "-m mark --mark 1 -g $bridge-IN") | |
370 | if $direction eq 'OUT'; | |
371 | } else { | |
372 | $rule->{action} = "$bridge-IN" if $rule->{action} eq 'ACCEPT' && $direction eq 'OUT'; | |
373 | ruleset_generate_rule($ruleset, $tapchain, $rule); | |
374 | } | |
375 | } | |
376 | } | |
377 | ||
378 | ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-dropped: \" --log-level 4"); | |
379 | ruleset_addrule($ruleset, $tapchain, "-j DROP"); | |
380 | ||
381 | # plug the tap chain to bridge chain | |
382 | my $physdevdirection = $direction eq 'IN' ? "out" : "in"; | |
383 | my $rule = "-m physdev --physdev-$physdevdirection $iface --physdev-is-bridged -j $tapchain"; | |
384 | ruleset_insertrule($ruleset, "$bridge-$direction", $rule); | |
385 | ||
386 | if ($direction eq 'OUT'){ | |
387 | # add tap->host rules | |
388 | my $rule = "-m physdev --physdev-$physdevdirection $iface -j $tapchain"; | |
389 | ruleset_addrule($ruleset, "PVEFW-INPUT", $rule); | |
390 | } | |
391 | } | |
392 | ||
393 | sub enablehostfw { | |
394 | my ($ruleset, $rules, $group_rules) = @_; | |
395 | ||
396 | # fixme: allow security groups | |
397 | ||
398 | # host inbound firewall | |
399 | my $chain = "PVEFW-HOST-IN"; | |
400 | ruleset_create_chain($ruleset, $chain); | |
401 | ||
402 | ruleset_addrule($ruleset, $chain, "-m state --state INVALID -j DROP"); | |
403 | ruleset_addrule($ruleset, $chain, "-m state --state RELATED,ESTABLISHED -j ACCEPT"); | |
404 | ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT"); | |
405 | ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT"); | |
406 | ruleset_addrule($ruleset, $chain, "-p udp -m state --state NEW -m multiport --dports 5404,5405 -j ACCEPT"); | |
407 | ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync | |
408 | ||
409 | if ($rules->{in}) { | |
410 | foreach my $rule (@{$rules->{in}}) { | |
411 | # we use RETURN because we need to check also tap rules | |
412 | $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT'; | |
413 | ruleset_generate_rule($ruleset, $chain, $rule); | |
414 | } | |
415 | } | |
416 | ||
417 | ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-IN dropped: \" --log-level 4"); | |
418 | ruleset_addrule($ruleset, $chain, "-j DROP"); | |
419 | ||
420 | # host outbound firewall | |
421 | $chain = "PVEFW-HOST-OUT"; | |
422 | ruleset_create_chain($ruleset, $chain); | |
423 | ||
424 | ruleset_addrule($ruleset, $chain, "-m state --state INVALID -j DROP"); | |
425 | ruleset_addrule($ruleset, $chain, "-m state --state RELATED,ESTABLISHED -j ACCEPT"); | |
426 | ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT"); | |
427 | ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT"); | |
428 | ruleset_addrule($ruleset, $chain, "-p udp -m state --state NEW -m multiport --dports 5404,5405 -j ACCEPT"); | |
429 | ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync | |
430 | ||
431 | if ($rules->{out}) { | |
432 | foreach my $rule (@{$rules->{out}}) { | |
433 | # we use RETURN because we need to check also tap rules | |
434 | $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT'; | |
435 | ruleset_generate_rule($ruleset, $chain, $rule); | |
436 | } | |
437 | } | |
438 | ||
439 | ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-OUT dropped: \" --log-level 4"); | |
440 | ruleset_addrule($ruleset, $chain, "-j DROP"); | |
441 | ||
442 | ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT"); | |
443 | ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN"); | |
444 | } | |
445 | ||
446 | sub generate_group_rules { | |
447 | my ($ruleset, $group_rules, $group) = @_; | |
448 | ||
449 | my $rules = $group_rules->{$group}; | |
450 | ||
451 | die "no such security group '$group'\n" if !$rules; | |
452 | ||
453 | my $chain = "GROUP-${group}-IN"; | |
454 | ||
455 | ruleset_create_chain($ruleset, $chain); | |
456 | ||
457 | if ($rules->{in}) { | |
458 | foreach my $rule (@{$rules->{in}}) { | |
459 | ruleset_generate_rule($ruleset, $chain, $rule); | |
460 | } | |
461 | } | |
462 | ||
463 | $chain = "GROUP-${group}-OUT"; | |
464 | ||
465 | ruleset_create_chain($ruleset, $chain); | |
466 | ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark | |
467 | ||
468 | if ($rules->{out}) { | |
469 | foreach my $rule (@{$rules->{out}}) { | |
470 | # we go the PVEFW-SET-ACCEPT-MARK Instead of ACCEPT) because we need to | |
471 | # check also other tap rules (and group rules can be set on any bridge, | |
472 | # so we can't go to VMBRXX-IN) | |
473 | $rule->{action} = 'PVEFW-SET-ACCEPT-MARK' if $rule->{action} eq 'ACCEPT'; | |
474 | ruleset_generate_rule($ruleset, $chain, $rule); | |
475 | } | |
476 | } | |
477 | } | |
478 | ||
479 | my $MAX_NETS = 32; | |
480 | my $valid_netdev_names = {}; | |
481 | for (my $i = 0; $i < $MAX_NETS; $i++) { | |
482 | $valid_netdev_names->{"net$i"} = 1; | |
483 | } | |
484 | ||
485 | sub parse_fw_rule { | |
486 | my ($line, $need_iface, $allow_groups) = @_; | |
487 | ||
488 | my $macros = get_firewall_macros(); | |
489 | my $protocols = get_etc_protocols(); | |
490 | ||
491 | my ($action, $iface, $source, $dest, $proto, $dport, $sport); | |
492 | ||
493 | $line =~ s/#.*$//; | |
494 | ||
495 | my @data = split(/\s+/, $line); | |
496 | my $expected_elements = $need_iface ? 7 : 6; | |
497 | ||
498 | die "wrong number of rule elements\n" if scalar(@data) > $expected_elements; | |
499 | ||
500 | if ($need_iface) { | |
501 | ($action, $iface, $source, $dest, $proto, $dport, $sport) = @data | |
502 | } else { | |
503 | ($action, $source, $dest, $proto, $dport, $sport) = @data; | |
504 | } | |
505 | ||
506 | die "incomplete rule\n" if !$action; | |
507 | ||
508 | my $macro; | |
509 | my $macro_name; | |
510 | ||
511 | if ($action =~ m/^(ACCEPT|DROP|REJECT)$/) { | |
512 | # OK | |
513 | } elsif ($allow_groups && $action =~ m/^GROUP-(:?\S+)$/) { | |
514 | # OK | |
515 | } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) { | |
516 | ($macro_name, $action) = ($1, $2); | |
517 | my $lc_macro_name = lc($macro_name); | |
518 | my $preferred_name = $pve_fw_preferred_macro_names->{$lc_macro_name}; | |
519 | $macro_name = $preferred_name if $preferred_name; | |
520 | $macro = $macros->{$lc_macro_name}; | |
521 | die "unknown macro '$macro_name'\n" if !$macro; | |
522 | } else { | |
523 | die "unknown action '$action'\n"; | |
524 | } | |
525 | ||
526 | if ($need_iface) { | |
527 | $iface = undef if $iface && $iface eq '-'; | |
528 | die "unknown interface '$iface'\n" | |
529 | if defined($iface) && !$valid_netdev_names->{$iface}; | |
530 | } | |
531 | ||
532 | $proto = undef if $proto && $proto eq '-'; | |
533 | die "unknown protokol '$proto'\n" if $proto && | |
534 | !(defined($protocols->{byname}->{$proto}) || | |
535 | defined($protocols->{byid}->{$proto})); | |
536 | ||
537 | $source = undef if $source && $source eq '-'; | |
538 | $dest = undef if $dest && $dest eq '-'; | |
539 | ||
540 | $dport = undef if $dport && $dport eq '-'; | |
541 | $sport = undef if $sport && $sport eq '-'; | |
542 | ||
543 | my $nbsource = undef; | |
544 | my $nbdest = undef; | |
545 | ||
546 | $nbsource = parse_address_list($source) if $source; | |
547 | $nbdest = parse_address_list($dest) if $dest; | |
548 | ||
549 | my $rules = []; | |
550 | ||
551 | my $param = { | |
552 | action => $action, | |
553 | iface => $iface, | |
554 | source => $source, | |
555 | dest => $dest, | |
556 | nbsource => $nbsource, | |
557 | nbdest => $nbdest, | |
558 | proto => $proto, | |
559 | dport => $dport, | |
560 | sport => $sport, | |
561 | }; | |
562 | ||
563 | if ($macro) { | |
564 | foreach my $templ (@$macro) { | |
565 | my $rule = {}; | |
566 | foreach my $k (keys %$templ) { | |
567 | my $v = $templ->{$k}; | |
568 | $v = $param->{$k} if $v eq 'PARAM'; | |
569 | die "missing parameter '$k' in macro '$macro_name'\n" if !defined($v); | |
570 | $rule->{$k} = $v; | |
571 | } | |
572 | push @$rules, $rule; | |
573 | } | |
574 | } else { | |
575 | push @$rules, $param; | |
576 | } | |
577 | ||
578 | foreach my $rule (@$rules) { | |
579 | $rule->{nbdport} = parse_port_name_number_or_range($rule->{dport}) | |
580 | if defined($rule->{dport}); | |
581 | $rule->{nbsport} = parse_port_name_number_or_range($rule->{sport}) | |
582 | if defined($rule->{sport}); | |
583 | } | |
584 | ||
585 | return $rules; | |
586 | } | |
587 | ||
588 | sub parse_vm_fw_rules { | |
589 | my ($filename, $fh) = @_; | |
590 | ||
591 | my $res = { in => [], out => [] }; | |
592 | ||
593 | my $section; | |
594 | ||
595 | while (defined(my $line = <$fh>)) { | |
596 | next if $line =~ m/^#/; | |
597 | next if $line =~ m/^\s*$/; | |
598 | ||
599 | my $linenr = $fh->input_line_number(); | |
600 | my $prefix = "$filename (line $linenr)"; | |
601 | ||
602 | if ($line =~ m/^\[(in|out)\]\s*$/i) { | |
603 | $section = lc($1); | |
604 | next; | |
605 | } | |
606 | if (!$section) { | |
607 | warn "$prefix: skip line - no section"; | |
608 | next; | |
609 | } | |
610 | ||
611 | my $rules; | |
612 | eval { $rules = parse_fw_rule($line, 1, 1); }; | |
613 | if (my $err = $@) { | |
614 | warn "$prefix: $err"; | |
615 | next; | |
616 | } | |
617 | ||
618 | push @{$res->{$section}}, @$rules; | |
619 | } | |
620 | ||
621 | return $res; | |
622 | } | |
623 | ||
624 | sub parse_host_fw_rules { | |
625 | my ($filename, $fh) = @_; | |
626 | ||
627 | my $res = { in => [], out => [] }; | |
628 | ||
629 | my $section; | |
630 | ||
631 | while (defined(my $line = <$fh>)) { | |
632 | next if $line =~ m/^#/; | |
633 | next if $line =~ m/^\s*$/; | |
634 | ||
635 | my $linenr = $fh->input_line_number(); | |
636 | my $prefix = "$filename (line $linenr)"; | |
637 | ||
638 | if ($line =~ m/^\[(in|out)\]\s*$/i) { | |
639 | $section = lc($1); | |
640 | next; | |
641 | } | |
642 | if (!$section) { | |
643 | warn "$prefix: skip line - no section"; | |
644 | next; | |
645 | } | |
646 | ||
647 | my $rules; | |
648 | eval { $rules = parse_fw_rule($line, 1, 1); }; | |
649 | if (my $err = $@) { | |
650 | warn "$prefix: $err"; | |
651 | next; | |
652 | } | |
653 | ||
654 | push @{$res->{$section}}, @$rules; | |
655 | } | |
656 | ||
657 | return $res; | |
658 | } | |
659 | ||
660 | sub parse_group_fw_rules { | |
661 | my ($filename, $fh) = @_; | |
662 | ||
663 | my $section; | |
664 | my $group; | |
665 | ||
666 | my $res = { in => [], out => [] }; | |
667 | ||
668 | while (defined(my $line = <$fh>)) { | |
669 | next if $line =~ m/^#/; | |
670 | next if $line =~ m/^\s*$/; | |
671 | ||
672 | my $linenr = $fh->input_line_number(); | |
673 | my $prefix = "$filename (line $linenr)"; | |
674 | ||
675 | if ($line =~ m/^\[(in|out):(\S+)\]\s*$/i) { | |
676 | $section = lc($1); | |
677 | $group = lc($2); | |
678 | next; | |
679 | } | |
680 | if (!$section || !$group) { | |
681 | warn "$prefix: skip line - no section"; | |
682 | next; | |
683 | } | |
684 | ||
685 | my $rules; | |
686 | eval { $rules = parse_fw_rule($line, 0, 0); }; | |
687 | if (my $err = $@) { | |
688 | warn "$prefix: $err"; | |
689 | next; | |
690 | } | |
691 | ||
692 | push @{$res->{$group}->{$section}}, @$rules; | |
693 | } | |
694 | ||
695 | return $res; | |
696 | } | |
697 | ||
698 | sub run_locked { | |
699 | my ($code, @param) = @_; | |
700 | ||
701 | my $timeout = 10; | |
702 | ||
703 | my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param); | |
704 | ||
705 | die $@ if $@; | |
706 | ||
707 | return $res; | |
708 | } | |
709 | ||
710 | sub read_local_vm_config { | |
711 | ||
712 | my $openvz = {}; | |
713 | ||
714 | my $qemu = {}; | |
715 | ||
716 | my $list = PVE::QemuServer::config_list(); | |
717 | ||
718 | foreach my $vmid (keys %$list) { | |
719 | my $cfspath = PVE::QemuServer::cfs_config_path($vmid); | |
720 | if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) { | |
721 | $qemu->{$vmid} = $conf; | |
722 | } | |
723 | } | |
724 | ||
725 | my $vmdata = { openvz => $openvz, qemu => $qemu }; | |
726 | ||
727 | return $vmdata; | |
728 | }; | |
729 | ||
730 | sub read_vm_firewall_rules { | |
731 | my ($vmdata) = @_; | |
732 | my $rules = {}; | |
733 | foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) { | |
734 | my $filename = "/etc/pve/firewall/$vmid.fw"; | |
735 | my $fh = IO::File->new($filename, O_RDONLY); | |
736 | next if !$fh; | |
737 | ||
738 | $rules->{$vmid} = parse_vm_fw_rules($filename, $fh); | |
739 | } | |
740 | ||
741 | return $rules; | |
742 | } | |
743 | ||
744 | sub compile { | |
745 | my $vmdata = read_local_vm_config(); | |
746 | my $rules = read_vm_firewall_rules($vmdata); | |
747 | ||
748 | my $group_rules = {}; | |
749 | my $filename = "/etc/pve/firewall/groups.fw"; | |
750 | if (my $fh = IO::File->new($filename, O_RDONLY)) { | |
751 | $group_rules = parse_group_fw_rules($filename, $fh); | |
752 | } | |
753 | ||
754 | #print Dumper($rules); | |
755 | ||
756 | my $ruleset = {}; | |
757 | ||
758 | # setup host firewall rules | |
759 | ruleset_create_chain($ruleset, "PVEFW-INPUT"); | |
760 | ruleset_create_chain($ruleset, "PVEFW-OUTPUT"); | |
761 | ||
762 | ruleset_create_chain($ruleset, "PVEFW-SET-ACCEPT-MARK"); | |
763 | ruleset_addrule($ruleset, "PVEFW-SET-ACCEPT-MARK", "-j MARK --set-mark 1"); | |
764 | ||
765 | $filename = "/etc/pve/local/host.fw"; | |
766 | if (my $fh = IO::File->new($filename, O_RDONLY)) { | |
767 | my $host_rules = parse_host_fw_rules($filename, $fh); | |
768 | enablehostfw($ruleset, $host_rules, $group_rules); | |
769 | } | |
770 | ||
771 | # generate firewall rules for QEMU VMs | |
772 | foreach my $vmid (keys %{$vmdata->{qemu}}) { | |
773 | my $conf = $vmdata->{qemu}->{$vmid}; | |
774 | next if !$rules->{$vmid}; | |
775 | ||
776 | foreach my $netid (keys %$conf) { | |
777 | next if $netid !~ m/^net(\d+)$/; | |
778 | my $net = PVE::QemuServer::parse_net($conf->{$netid}); | |
779 | next if !$net; | |
780 | my $iface = "tap${vmid}i$1"; | |
781 | ||
782 | my $bridge = $net->{bridge}; | |
783 | next if !$bridge; # fixme: ? | |
784 | ||
785 | $bridge .= "v$net->{tag}" if $net->{tag}; | |
786 | ||
787 | generate_bridge_chains($ruleset, $bridge); | |
788 | ||
789 | my $macaddr = $net->{macaddr}; | |
790 | generate_tap_rules_direction($ruleset, $group_rules, $iface, $netid, $macaddr, $rules->{$vmid}->{in}, $bridge, 'IN'); | |
791 | generate_tap_rules_direction($ruleset, $group_rules, $iface, $netid, $macaddr, $rules->{$vmid}->{out}, $bridge, 'OUT'); | |
792 | } | |
793 | } | |
794 | return $ruleset; | |
795 | } | |
796 | ||
797 | sub get_ruleset_status { | |
798 | my ($ruleset, $verbose) = @_; | |
799 | ||
800 | my $active_chains = iptables_get_chains(); | |
801 | ||
802 | my $statushash = {}; | |
803 | ||
804 | foreach my $chain (sort keys %$ruleset) { | |
805 | my $digest = Digest::SHA->new('sha1'); | |
806 | foreach my $cmd (@{$ruleset->{$chain}}) { | |
807 | $digest->add("$cmd\n"); | |
808 | } | |
809 | my $sig = $digest->b64digest; | |
810 | $statushash->{$chain}->{sig} = $sig; | |
811 | ||
812 | my $oldsig = $active_chains->{$chain}; | |
813 | if (!defined($oldsig)) { | |
814 | $statushash->{$chain}->{action} = 'create'; | |
815 | } else { | |
816 | if ($oldsig eq $sig) { | |
817 | $statushash->{$chain}->{action} = 'exists'; | |
818 | } else { | |
819 | $statushash->{$chain}->{action} = 'update'; | |
820 | } | |
821 | } | |
822 | print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose; | |
823 | foreach my $cmd (@{$ruleset->{$chain}}) { | |
824 | print "\t$cmd\n" if $verbose; | |
825 | } | |
826 | } | |
827 | ||
828 | foreach my $chain (sort keys %$active_chains) { | |
829 | if (!defined($ruleset->{$chain})) { | |
830 | my $sig = $active_chains->{$chain}; | |
831 | $statushash->{$chain}->{action} = 'delete'; | |
832 | $statushash->{$chain}->{sig} = $sig; | |
833 | print "delete $chain ($sig)\n" if $verbose; | |
834 | } | |
835 | } | |
836 | ||
837 | return $statushash; | |
838 | } | |
839 | ||
840 | sub print_ruleset { | |
841 | my ($ruleset) = @_; | |
842 | ||
843 | get_ruleset_status($ruleset, 1); | |
844 | } | |
845 | ||
846 | sub print_sig_rule { | |
847 | my ($chain, $sig) = @_; | |
848 | ||
849 | # We just use this to store a SHA1 checksum used to detect changes | |
850 | return "-A $chain -m comment --comment \"PVESIG:$sig\"\n"; | |
851 | } | |
852 | ||
853 | sub apply_ruleset { | |
854 | my ($ruleset, $verbose) = @_; | |
855 | ||
856 | enable_bridge_firewall(); | |
857 | ||
858 | my $cmdlist = "*filter\n"; # we pass this to iptables-restore; | |
859 | ||
860 | my $statushash = get_ruleset_status($ruleset, $verbose); | |
861 | ||
862 | # create missing chains first | |
863 | foreach my $chain (sort keys %$ruleset) { | |
864 | my $stat = $statushash->{$chain}; | |
865 | die "internal error" if !$stat; | |
866 | next if $stat->{action} ne 'create'; | |
867 | ||
868 | $cmdlist .= ":$chain - [0:0]\n"; | |
869 | } | |
870 | ||
871 | my $rule = "INPUT -j PVEFW-INPUT"; | |
872 | if (!PVE::Firewall::iptables_rule_exist($rule)) { | |
873 | $cmdlist .= "-A $rule\n"; | |
874 | } | |
875 | $rule = "OUTPUT -j PVEFW-OUTPUT"; | |
876 | if (!PVE::Firewall::iptables_rule_exist($rule)) { | |
877 | $cmdlist .= "-A $rule\n"; | |
878 | } | |
879 | ||
880 | $rule = "FORWARD -j PVEFW-FORWARD"; | |
881 | if (!PVE::Firewall::iptables_rule_exist($rule)) { | |
882 | $cmdlist .= "-A $rule\n"; | |
883 | } | |
884 | ||
885 | foreach my $chain (sort keys %$ruleset) { | |
886 | my $stat = $statushash->{$chain}; | |
887 | die "internal error" if !$stat; | |
888 | ||
889 | if ($stat->{action} eq 'update' || $stat->{action} eq 'create') { | |
890 | $cmdlist .= "-F $chain\n"; | |
891 | foreach my $cmd (@{$ruleset->{$chain}}) { | |
892 | $cmdlist .= "$cmd\n"; | |
893 | } | |
894 | $cmdlist .= print_sig_rule($chain, $stat->{sig}); | |
895 | } elsif ($stat->{action} eq 'delete') { | |
896 | die "internal error"; # this should not happen | |
897 | } elsif ($stat->{action} eq 'exists') { | |
898 | # do nothing | |
899 | } else { | |
900 | die "internal error - unknown status '$stat->{action}'"; | |
901 | } | |
902 | } | |
903 | ||
904 | foreach my $chain (keys %$statushash) { | |
905 | next if $statushash->{$chain}->{action} ne 'delete'; | |
906 | $cmdlist .= "-F $chain\n"; | |
907 | } | |
908 | foreach my $chain (keys %$statushash) { | |
909 | next if $statushash->{$chain}->{action} ne 'delete'; | |
910 | $cmdlist .= "-X $chain\n"; | |
911 | } | |
912 | ||
913 | $cmdlist .= "COMMIT\n"; | |
914 | ||
915 | print $cmdlist if $verbose; | |
916 | ||
917 | iptables_restore_cmdlist($cmdlist); | |
918 | ||
919 | # test: re-read status and check if everything is up to date | |
920 | $statushash = get_ruleset_status($ruleset); | |
921 | ||
922 | my $errors; | |
923 | foreach my $chain (sort keys %$ruleset) { | |
924 | my $stat = $statushash->{$chain}; | |
925 | if ($stat->{action} ne 'exists') { | |
926 | warn "unable to update chain '$chain'\n"; | |
927 | $errors = 1; | |
928 | } | |
929 | } | |
930 | ||
931 | die "unable to apply firewall changes\n" if $errors; | |
932 | } | |
933 | ||
934 | 1; |