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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 | 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, $chain) = @_; | |
260 | ||
261 | die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28; | |
262 | ||
263 | die "chain '$chain' already exists\n" if $ruleset->{$chain}; | |
264 | ||
265 | $ruleset->{$chain} = []; | |
266 | } | |
267 | ||
268 | sub ruleset_chain_exist { | |
269 | my ($ruleset, $chain) = @_; | |
270 | ||
271 | return $ruleset->{$chain} ? 1 : undef; | |
272 | } | |
273 | ||
274 | sub ruleset_addrule { | |
275 | my ($ruleset, $chain, $rule) = @_; | |
276 | ||
277 | die "no such chain '$chain'\n" if !$ruleset->{$chain}; | |
278 | ||
279 | push @{$ruleset->{$chain}}, "-A $chain $rule"; | |
280 | } | |
281 | ||
282 | sub ruleset_insertrule { | |
283 | my ($ruleset, $chain, $rule) = @_; | |
284 | ||
285 | die "no such chain '$chain'\n" if !$ruleset->{$chain}; | |
286 | ||
287 | unshift @{$ruleset->{$chain}}, "-A $chain $rule"; | |
288 | } | |
289 | ||
290 | sub generate_bridge_chains { | |
291 | my ($ruleset, $bridge) = @_; | |
292 | ||
293 | if (!ruleset_chain_exist($ruleset, "PVEFW-BRIDGE-IN")){ | |
294 | ruleset_create_chain($ruleset, "PVEFW-BRIDGE-IN"); | |
295 | } | |
296 | ||
297 | if (!ruleset_chain_exist($ruleset, "PVEFW-BRIDGE-OUT")){ | |
298 | ruleset_create_chain($ruleset, "PVEFW-BRIDGE-OUT"); | |
299 | } | |
300 | ||
301 | if (!ruleset_chain_exist($ruleset, "PVEFW-FORWARD")){ | |
302 | ruleset_create_chain($ruleset, "PVEFW-FORWARD"); | |
303 | ||
304 | ruleset_addrule($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"); | |
307 | } | |
308 | ||
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, "$bridge-IN", "-j ACCEPT"); | |
314 | } | |
315 | ||
316 | if (!ruleset_chain_exist($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 $bridge-OUT"); | |
320 | } | |
321 | } | |
322 | ||
323 | sub generate_tap_rules_direction { | |
324 | my ($ruleset, $iface, $netid, $macaddr, $rules, $bridge, $direction) = @_; | |
325 | ||
326 | my $tapchain = "$iface-$direction"; | |
327 | ||
328 | ruleset_create_chain($ruleset, $tapchain); | |
329 | ||
330 | ruleset_addrule($ruleset, $tapchain, "-m state --state INVALID -j DROP"); | |
331 | ruleset_addrule($ruleset, $tapchain, "-m state --state RELATED,ESTABLISHED -j ACCEPT"); | |
332 | ||
333 | if ($direction eq 'OUT' && defined($macaddr)) { | |
334 | ruleset_addrule($ruleset, $tapchain, "-m mac ! --mac-source $macaddr -j DROP"); | |
335 | } | |
336 | ||
337 | if ($rules) { | |
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); | |
345 | } | |
346 | } | |
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, $rule); | |
350 | } | |
351 | } | |
352 | ||
353 | ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-dropped: \" --log-level 4"); | |
354 | ruleset_addrule($ruleset, $tapchain, "-j DROP"); | |
355 | ||
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", $rule); | |
360 | ||
361 | if ($direction eq 'OUT'){ | |
362 | # add tap->host rules | |
363 | my $rule = "-m physdev --physdev-$physdevdirection $iface -j $tapchain"; | |
364 | ruleset_addrule($ruleset, "PVEFW-INPUT", $rule); | |
365 | } | |
366 | } | |
367 | ||
368 | sub enablehostfw { | |
369 | my ($ruleset) = @_; | |
370 | ||
371 | my $filename = "/etc/pve/local/host.fw"; | |
372 | my $fh = IO::File->new($filename, O_RDONLY); | |
373 | return if !$fh; | |
374 | ||
375 | my $rules = parse_fw_rules($filename, $fh); | |
376 | ||
377 | # host inbound firewall | |
378 | my $chain = "PVEFW-HOST-IN"; | |
379 | ruleset_create_chain($ruleset, $chain); | |
380 | ||
381 | ruleset_addrule($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, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync | |
387 | ||
388 | if ($rules->{in}) { | |
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, $rule); | |
393 | } | |
394 | } | |
395 | ||
396 | ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-IN dropped: \" --log-level 4"); | |
397 | ruleset_addrule($ruleset, $chain, "-j DROP"); | |
398 | ||
399 | # host outbound firewall | |
400 | $chain = "PVEFW-HOST-OUT"; | |
401 | ruleset_create_chain($ruleset, $chain); | |
402 | ||
403 | ruleset_addrule($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, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync | |
409 | ||
410 | if ($rules->{out}) { | |
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, $rule); | |
415 | } | |
416 | } | |
417 | ||
418 | ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-OUT dropped: \" --log-level 4"); | |
419 | ruleset_addrule($ruleset, $chain, "-j DROP"); | |
420 | ||
421 | ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT"); | |
422 | ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN"); | |
423 | } | |
424 | ||
425 | sub generate_group_rules { | |
426 | my ($ruleset, $group) = @_; | |
427 | ||
428 | my $filename = "/etc/pve/firewall/groups.fw"; | |
429 | my $fh = IO::File->new($filename, O_RDONLY); | |
430 | return if !$fh; | |
431 | ||
432 | my $rules = parse_fw_rules($filename, $fh, $group); | |
433 | ||
434 | my $chain = "GROUP-${group}-IN"; | |
435 | ||
436 | ruleset_create_chain($ruleset, $chain); | |
437 | ||
438 | if ($rules->{in}) { | |
439 | foreach my $rule (@{$rules->{in}}) { | |
440 | ruleset_generate_rule($ruleset, $chain, $rule); | |
441 | } | |
442 | } | |
443 | ||
444 | $chain = "GROUP-${group}-OUT"; | |
445 | ||
446 | ruleset_create_chain($ruleset, $chain); | |
447 | ||
448 | if ($rules->{out}) { | |
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 $rule->{action} eq 'ACCEPT'; | |
453 | ruleset_generate_rule($rule, $chain, $rule); | |
454 | } | |
455 | } | |
456 | } | |
457 | ||
458 | sub parse_fw_rules { | |
459 | my ($filename, $fh, $group) = @_; | |
460 | ||
461 | my $section; | |
462 | my $securitygroup; | |
463 | my $securitygroupexist; | |
464 | ||
465 | my $res = { in => [], out => [] }; | |
466 | ||
467 | my $macros = get_firewall_macros(); | |
468 | my $protocols = get_etc_protocols(); | |
469 | ||
470 | while (defined(my $line = <$fh>)) { | |
471 | next if $line =~ m/^#/; | |
472 | next if $line =~ m/^\s*$/; | |
473 | ||
474 | if ($line =~ m/^\[(in|out)(:(\S+))?\]\s*$/i) { | |
475 | $section = lc($1); | |
476 | $securitygroup = lc($3) if $3; | |
477 | $securitygroupexist = 1 if $securitygroup && $securitygroup eq $group; | |
478 | next; | |
479 | } | |
480 | next if !$section; | |
481 | next if $group && $securitygroup ne $group; | |
482 | ||
483 | my ($action, $iface, $source, $dest, $proto, $dport, $sport) = | |
484 | split(/\s+/, $line); | |
485 | ||
486 | if (!$action) { | |
487 | warn "skip incomplete line\n"; | |
488 | next; | |
489 | } | |
490 | ||
491 | my $service; | |
492 | if ($action =~ m/^(ACCEPT|DROP|REJECT|GROUP-(\S+))$/) { | |
493 | # OK | |
494 | } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) { | |
495 | ($service, $action) = ($1, $2); | |
496 | if (!$macros->{$service}) { | |
497 | warn "unknown service '$service'\n"; | |
498 | next; | |
499 | } | |
500 | } else { | |
501 | warn "unknown action '$action'\n"; | |
502 | next; | |
503 | } | |
504 | ||
505 | $iface = undef if $iface && $iface eq '-'; | |
506 | if ($iface && $iface !~ m/^(net0|net1|net2|net3|net4|net5)$/) { | |
507 | warn "unknown interface '$iface'\n"; | |
508 | next; | |
509 | } | |
510 | ||
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"; | |
515 | next; | |
516 | } | |
517 | ||
518 | $source = undef if $source && $source eq '-'; | |
519 | $dest = undef if $dest && $dest eq '-'; | |
520 | ||
521 | $dport = undef if $dport && $dport eq '-'; | |
522 | $sport = undef if $sport && $sport eq '-'; | |
523 | my $nbdport = undef; | |
524 | my $nbsport = undef; | |
525 | my $nbsource = undef; | |
526 | my $nbdest = undef; | |
527 | ||
528 | eval { | |
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; | |
533 | }; | |
534 | if (my $err = $@) { | |
535 | warn $err; | |
536 | next; | |
537 | ||
538 | } | |
539 | ||
540 | ||
541 | my $rule = { | |
542 | action => $action, | |
543 | service => $service, | |
544 | iface => $iface, | |
545 | source => $source, | |
546 | dest => $dest, | |
547 | nbsource => $nbsource, | |
548 | nbdest => $nbdest, | |
549 | proto => $proto, | |
550 | dport => $dport, | |
551 | sport => $sport, | |
552 | nbdport => $nbdport, | |
553 | nbsport => $nbsport, | |
554 | ||
555 | }; | |
556 | ||
557 | push @{$res->{$section}}, $rule; | |
558 | } | |
559 | ||
560 | die "security group $group don't exist" if $group && !$securitygroupexist; | |
561 | return $res; | |
562 | } | |
563 | ||
564 | sub run_locked { | |
565 | my ($code, @param) = @_; | |
566 | ||
567 | my $timeout = 10; | |
568 | ||
569 | my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param); | |
570 | ||
571 | die $@ if $@; | |
572 | ||
573 | return $res; | |
574 | } | |
575 | ||
576 | sub read_local_vm_config { | |
577 | ||
578 | my $openvz = {}; | |
579 | ||
580 | my $qemu = {}; | |
581 | ||
582 | my $list = PVE::QemuServer::config_list(); | |
583 | ||
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; | |
588 | } | |
589 | } | |
590 | ||
591 | my $vmdata = { openvz => $openvz, qemu => $qemu }; | |
592 | ||
593 | return $vmdata; | |
594 | }; | |
595 | ||
596 | sub read_vm_firewall_rules { | |
597 | my ($vmdata) = @_; | |
598 | my $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); | |
602 | next if !$fh; | |
603 | ||
604 | $rules->{$vmid} = parse_fw_rules($filename, $fh); | |
605 | } | |
606 | ||
607 | return $rules; | |
608 | } | |
609 | ||
610 | sub compile { | |
611 | my $vmdata = read_local_vm_config(); | |
612 | my $rules = read_vm_firewall_rules($vmdata); | |
613 | ||
614 | #print Dumper($rules); | |
615 | ||
616 | my $ruleset = {}; | |
617 | ||
618 | # setup host firewall rules | |
619 | ruleset_create_chain($ruleset, "PVEFW-INPUT"); | |
620 | ruleset_create_chain($ruleset, "PVEFW-OUTPUT"); | |
621 | ||
622 | enablehostfw($ruleset); | |
623 | ||
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}; | |
628 | ||
629 | foreach my $netid (keys %$conf) { | |
630 | next if $netid !~ m/^net(\d+)$/; | |
631 | my $net = PVE::QemuServer::parse_net($conf->{$netid}); | |
632 | next if !$net; | |
633 | my $iface = "tap${vmid}i$1"; | |
634 | ||
635 | my $bridge = $net->{bridge}; | |
636 | next if !$bridge; # fixme: ? | |
637 | ||
638 | $bridge .= "v$net->{tag}" if $net->{tag}; | |
639 | ||
640 | generate_bridge_chains($ruleset, $bridge); | |
641 | ||
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'); | |
645 | } | |
646 | } | |
647 | return $ruleset; | |
648 | } | |
649 | ||
650 | sub get_ruleset_status { | |
651 | my ($ruleset, $verbose) = @_; | |
652 | ||
653 | my $active_chains = iptables_get_chains(); | |
654 | ||
655 | my $statushash = {}; | |
656 | ||
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"); | |
661 | } | |
662 | my $sig = $digest->b64digest; | |
663 | $statushash->{$chain}->{sig} = $sig; | |
664 | ||
665 | my $oldsig = $active_chains->{$chain}; | |
666 | if (!defined($oldsig)) { | |
667 | $statushash->{$chain}->{action} = 'create'; | |
668 | } else { | |
669 | if ($oldsig eq $sig) { | |
670 | $statushash->{$chain}->{action} = 'exists'; | |
671 | } else { | |
672 | $statushash->{$chain}->{action} = 'update'; | |
673 | } | |
674 | } | |
675 | print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose; | |
676 | foreach my $cmd (@{$ruleset->{$chain}}) { | |
677 | print "\t$cmd\n" if $verbose; | |
678 | } | |
679 | } | |
680 | ||
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; | |
687 | } | |
688 | } | |
689 | ||
690 | return $statushash; | |
691 | } | |
692 | ||
693 | sub print_ruleset { | |
694 | my ($ruleset) = @_; | |
695 | ||
696 | get_ruleset_status($ruleset, 1); | |
697 | } | |
698 | ||
699 | sub print_sig_rule { | |
700 | my ($chain, $sig) = @_; | |
701 | ||
702 | # We just use this to store a SHA1 checksum used to detect changes | |
703 | return "-A $chain -m comment --comment \"PVESIG:$sig\"\n"; | |
704 | } | |
705 | ||
706 | sub apply_ruleset { | |
707 | my ($ruleset, $verbose) = @_; | |
708 | ||
709 | enable_bridge_firewall(); | |
710 | ||
711 | my $cmdlist = "*filter\n"; # we pass this to iptables-restore; | |
712 | ||
713 | my $statushash = get_ruleset_status($ruleset, $verbose); | |
714 | ||
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'; | |
720 | ||
721 | $cmdlist .= ":$chain - [0:0]\n"; | |
722 | } | |
723 | ||
724 | my $rule = "INPUT -j PVEFW-INPUT"; | |
725 | if (!PVE::Firewall::iptables_rule_exist($rule)) { | |
726 | $cmdlist .= "-A $rule\n"; | |
727 | } | |
728 | $rule = "OUTPUT -j PVEFW-OUTPUT"; | |
729 | if (!PVE::Firewall::iptables_rule_exist($rule)) { | |
730 | $cmdlist .= "-A $rule\n"; | |
731 | } | |
732 | ||
733 | $rule = "FORWARD -j PVEFW-FORWARD"; | |
734 | if (!PVE::Firewall::iptables_rule_exist($rule)) { | |
735 | $cmdlist .= "-A $rule\n"; | |
736 | } | |
737 | ||
738 | foreach my $chain (sort keys %$ruleset) { | |
739 | my $stat = $statushash->{$chain}; | |
740 | die "internal error" if !$stat; | |
741 | ||
742 | if ($stat->{action} eq 'update' || $stat->{action} eq 'create') { | |
743 | $cmdlist .= "-F $chain\n"; | |
744 | foreach my $cmd (@{$ruleset->{$chain}}) { | |
745 | $cmdlist .= "$cmd\n"; | |
746 | } | |
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') { | |
752 | # do nothing | |
753 | } else { | |
754 | die "internal error - unknown status '$stat->{action}'"; | |
755 | } | |
756 | } | |
757 | ||
758 | $cmdlist .= "COMMIT\n"; | |
759 | ||
760 | print $cmdlist if $verbose; | |
761 | ||
762 | iptables_restore_cmdlist($cmdlist); | |
763 | ||
764 | # test: re-read status and check if everything is up to date | |
765 | $statushash = get_ruleset_status($ruleset); | |
766 | ||
767 | my $errors; | |
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"; | |
772 | $errors = 1; | |
773 | } | |
774 | } | |
775 | ||
776 | die "unable to apply firewall changes\n" if $errors; | |
777 | } | |
778 | ||
779 | 1; |