implement allow_bridge_route feature
[pve-firewall.git] / src / 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::INotify;
8 use PVE::Cluster;
9 use PVE::ProcFSTools;
10 use PVE::Tools;
11 use PVE::QemuServer;
12 use PVE::OpenVZ; # dependeny problem?!
13 use File::Basename;
14 use File::Path;
15 use IO::File;
16 use Net::IP;
17 use PVE::Tools qw(run_command lock_file);
18
19 use Data::Dumper;
20
21 my $nodename = PVE::INotify::nodename();
22
23 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
24 my $pve_fw_status_filename = "/var/lib/pve-firewall/pvefw.status";
25
26 my $default_log_level = 'info';
27
28 my $log_level_hash = {
29 debug => 7,
30 info => 6,
31 notice => 5,
32 warning => 4,
33 err => 3,
34 crit => 2,
35 alert => 1,
36 emerg => 0,
37 };
38
39 # imported/converted from: /usr/share/shorewall/macro.*
40 my $pve_fw_macros = {
41 'Amanda' => [
42 { action => 'PARAM', proto => 'udp', dport => '10080' },
43 { action => 'PARAM', proto => 'tcp', dport => '10080' },
44 ],
45 'Auth' => [
46 { action => 'PARAM', proto => 'tcp', dport => '113' },
47 ],
48 'BGP' => [
49 { action => 'PARAM', proto => 'tcp', dport => '179' },
50 ],
51 'BitTorrent' => [
52 { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
53 { action => 'PARAM', proto => 'udp', dport => '6881' },
54 ],
55 'BitTorrent32' => [
56 { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
57 { action => 'PARAM', proto => 'udp', dport => '6881' },
58 ],
59 'CVS' => [
60 { action => 'PARAM', proto => 'tcp', dport => '2401' },
61 ],
62 'Citrix' => [
63 { action => 'PARAM', proto => 'tcp', dport => '1494' },
64 { action => 'PARAM', proto => 'udp', dport => '1604' },
65 { action => 'PARAM', proto => 'tcp', dport => '2598' },
66 ],
67 'DAAP' => [
68 { action => 'PARAM', proto => 'tcp', dport => '3689' },
69 { action => 'PARAM', proto => 'udp', dport => '3689' },
70 ],
71 'DCC' => [
72 { action => 'PARAM', proto => 'tcp', dport => '6277' },
73 ],
74 'DHCPfwd' => [
75 { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
76 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '67:68', sport => '67:68' },
77 ],
78 'DNS' => [
79 { action => 'PARAM', proto => 'udp', dport => '53' },
80 { action => 'PARAM', proto => 'tcp', dport => '53' },
81 ],
82 'Distcc' => [
83 { action => 'PARAM', proto => 'tcp', dport => '3632' },
84 ],
85 'Edonkey' => [
86 { action => 'PARAM', proto => 'tcp', dport => '4662' },
87 { action => 'PARAM', proto => 'udp', dport => '4665' },
88 ],
89 'FTP' => [
90 { action => 'PARAM', proto => 'tcp', dport => '21' },
91 ],
92 'Finger' => [
93 { action => 'PARAM', proto => 'tcp', dport => '79' },
94 ],
95 'GNUnet' => [
96 { action => 'PARAM', proto => 'tcp', dport => '2086' },
97 { action => 'PARAM', proto => 'udp', dport => '2086' },
98 { action => 'PARAM', proto => 'tcp', dport => '1080' },
99 { action => 'PARAM', proto => 'udp', dport => '1080' },
100 ],
101 'GRE' => [
102 { action => 'PARAM', proto => '47' },
103 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '47' },
104 ],
105 'Git' => [
106 { action => 'PARAM', proto => 'tcp', dport => '9418' },
107 ],
108 'Gnutella' => [
109 { action => 'PARAM', proto => 'tcp', dport => '6346' },
110 { action => 'PARAM', proto => 'udp', dport => '6346' },
111 ],
112 'HKP' => [
113 { action => 'PARAM', proto => 'tcp', dport => '11371' },
114 ],
115 'HTTP' => [
116 { action => 'PARAM', proto => 'tcp', dport => '80' },
117 ],
118 'HTTPS' => [
119 { action => 'PARAM', proto => 'tcp', dport => '443' },
120 ],
121 'ICPV2' => [
122 { action => 'PARAM', proto => 'udp', dport => '3130' },
123 ],
124 'ICQ' => [
125 { action => 'PARAM', proto => 'tcp', dport => '5190' },
126 ],
127 'IMAP' => [
128 { action => 'PARAM', proto => 'tcp', dport => '143' },
129 ],
130 'IMAPS' => [
131 { action => 'PARAM', proto => 'tcp', dport => '993' },
132 ],
133 'IPIP' => [
134 { action => 'PARAM', proto => '94' },
135 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '94' },
136 ],
137 'IPP' => [
138 { action => 'PARAM', proto => 'tcp', dport => '631' },
139 ],
140 'IPPbrd' => [
141 { action => 'PARAM', proto => 'udp', dport => '631' },
142 ],
143 'IPPserver' => [
144 { action => 'PARAM', source => 'SOURCE', dest => 'DEST', proto => 'tcp', dport => '631' },
145 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '631' },
146 ],
147 'IPsec' => [
148 { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
149 { action => 'PARAM', proto => '50' },
150 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500', sport => '500' },
151 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '50' },
152 ],
153 'IPsecah' => [
154 { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
155 { action => 'PARAM', proto => '51' },
156 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500', sport => '500' },
157 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '51' },
158 ],
159 'IPsecnat' => [
160 { action => 'PARAM', proto => 'udp', dport => '500' },
161 { action => 'PARAM', proto => 'udp', dport => '4500' },
162 { action => 'PARAM', proto => '50' },
163 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500' },
164 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '4500' },
165 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '50' },
166 ],
167 'IRC' => [
168 { action => 'PARAM', proto => 'tcp', dport => '6667' },
169 ],
170 'JabberPlain' => [
171 { action => 'PARAM', proto => 'tcp', dport => '5222' },
172 ],
173 'JabberSecure' => [
174 { action => 'PARAM', proto => 'tcp', dport => '5223' },
175 ],
176 'Jabberd' => [
177 { action => 'PARAM', proto => 'tcp', dport => '5269' },
178 ],
179 'Jetdirect' => [
180 { action => 'PARAM', proto => 'tcp', dport => '9100' },
181 ],
182 'L2TP' => [
183 { action => 'PARAM', proto => 'udp', dport => '1701' },
184 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '1701' },
185 ],
186 'LDAP' => [
187 { action => 'PARAM', proto => 'tcp', dport => '389' },
188 ],
189 'LDAPS' => [
190 { action => 'PARAM', proto => 'tcp', dport => '636' },
191 ],
192 'MSNP' => [
193 { action => 'PARAM', proto => 'tcp', dport => '1863' },
194 ],
195 'MSSQL' => [
196 { action => 'PARAM', proto => 'tcp', dport => '1433' },
197 ],
198 'Mail' => [
199 { action => 'PARAM', proto => 'tcp', dport => '25' },
200 { action => 'PARAM', proto => 'tcp', dport => '465' },
201 { action => 'PARAM', proto => 'tcp', dport => '587' },
202 ],
203 'Munin' => [
204 { action => 'PARAM', proto => 'tcp', dport => '4949' },
205 ],
206 'MySQL' => [
207 { action => 'PARAM', proto => 'tcp', dport => '3306' },
208 ],
209 'NNTP' => [
210 { action => 'PARAM', proto => 'tcp', dport => '119' },
211 ],
212 'NNTPS' => [
213 { action => 'PARAM', proto => 'tcp', dport => '563' },
214 ],
215 'NTP' => [
216 { action => 'PARAM', proto => 'udp', dport => '123' },
217 ],
218 'NTPbi' => [
219 { action => 'PARAM', proto => 'udp', dport => '123' },
220 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '123' },
221 ],
222 'NTPbrd' => [
223 { action => 'PARAM', proto => 'udp', dport => '123' },
224 { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '123' },
225 ],
226 'OSPF' => [
227 { action => 'PARAM', proto => '89' },
228 ],
229 'OpenVPN' => [
230 { action => 'PARAM', proto => 'udp', dport => '1194' },
231 ],
232 'PCA' => [
233 { action => 'PARAM', proto => 'udp', dport => '5632' },
234 { action => 'PARAM', proto => 'tcp', dport => '5631' },
235 ],
236 'POP3' => [
237 { action => 'PARAM', proto => 'tcp', dport => '110' },
238 ],
239 'POP3S' => [
240 { action => 'PARAM', proto => 'tcp', dport => '995' },
241 ],
242 'PPtP' => [
243 { action => 'PARAM', proto => '47' },
244 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '47' },
245 { action => 'PARAM', proto => 'tcp', dport => '1723' },
246 ],
247 'Ping' => [
248 { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
249 ],
250 'PostgreSQL' => [
251 { action => 'PARAM', proto => 'tcp', dport => '5432' },
252 ],
253 'Printer' => [
254 { action => 'PARAM', proto => 'tcp', dport => '515' },
255 ],
256 'RDP' => [
257 { action => 'PARAM', proto => 'tcp', dport => '3389' },
258 ],
259 'RIPbi' => [
260 { action => 'PARAM', proto => 'udp', dport => '520' },
261 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '520' },
262 ],
263 'RNDC' => [
264 { action => 'PARAM', proto => 'tcp', dport => '953' },
265 ],
266 'Razor' => [
267 { action => 'ACCEPT', proto => 'tcp', dport => '2703' },
268 ],
269 'Rdate' => [
270 { action => 'PARAM', proto => 'tcp', dport => '37' },
271 ],
272 'Rsync' => [
273 { action => 'PARAM', proto => 'tcp', dport => '873' },
274 ],
275 'SANE' => [
276 { action => 'PARAM', proto => 'tcp', dport => '6566' },
277 ],
278 'SMB' => [
279 { action => 'PARAM', proto => 'udp', dport => '135,445' },
280 { action => 'PARAM', proto => 'udp', dport => '137:139' },
281 { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
282 { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
283 ],
284 'SMBBI' => [
285 { action => 'PARAM', proto => 'udp', dport => '135,445' },
286 { action => 'PARAM', proto => 'udp', dport => '137:139' },
287 { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
288 { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
289 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '135,445' },
290 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '137:139' },
291 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '1024:65535', sport => '137' },
292 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'tcp', dport => '135,139,445' },
293 ],
294 'SMBswat' => [
295 { action => 'PARAM', proto => 'tcp', dport => '901' },
296 ],
297 'SMTP' => [
298 { action => 'PARAM', proto => 'tcp', dport => '25' },
299 ],
300 'SMTPS' => [
301 { action => 'PARAM', proto => 'tcp', dport => '465' },
302 ],
303 'SNMP' => [
304 { action => 'PARAM', proto => 'udp', dport => '161:162' },
305 { action => 'PARAM', proto => 'tcp', dport => '161' },
306 ],
307 'SPAMD' => [
308 { action => 'PARAM', proto => 'tcp', dport => '783' },
309 ],
310 'SSH' => [
311 { action => 'PARAM', proto => 'tcp', dport => '22' },
312 ],
313 'SVN' => [
314 { action => 'PARAM', proto => 'tcp', dport => '3690' },
315 ],
316 'SixXS' => [
317 { action => 'PARAM', proto => 'tcp', dport => '3874' },
318 { action => 'PARAM', proto => 'udp', dport => '3740' },
319 { action => 'PARAM', proto => '41' },
320 { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
321 ],
322 'Squid' => [
323 { action => 'PARAM', proto => 'tcp', dport => '3128' },
324 ],
325 'Submission' => [
326 { action => 'PARAM', proto => 'tcp', dport => '587' },
327 ],
328 'Syslog' => [
329 { action => 'PARAM', proto => 'udp', dport => '514' },
330 { action => 'PARAM', proto => 'tcp', dport => '514' },
331 ],
332 'TFTP' => [
333 { action => 'PARAM', proto => 'udp', dport => '69' },
334 ],
335 'Telnet' => [
336 { action => 'PARAM', proto => 'tcp', dport => '23' },
337 ],
338 'Telnets' => [
339 { action => 'PARAM', proto => 'tcp', dport => '992' },
340 ],
341 'Time' => [
342 { action => 'PARAM', proto => 'tcp', dport => '37' },
343 ],
344 'Trcrt' => [
345 { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
346 { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
347 ],
348 'VNC' => [
349 { action => 'PARAM', proto => 'tcp', dport => '5900:5909' },
350 ],
351 'VNCL' => [
352 { action => 'PARAM', proto => 'tcp', dport => '5500' },
353 ],
354 'Web' => [
355 { action => 'PARAM', proto => 'tcp', dport => '80' },
356 { action => 'PARAM', proto => 'tcp', dport => '443' },
357 ],
358 'Webcache' => [
359 { action => 'PARAM', proto => 'tcp', dport => '8080' },
360 ],
361 'Webmin' => [
362 { action => 'PARAM', proto => 'tcp', dport => '10000' },
363 ],
364 'Whois' => [
365 { action => 'PARAM', proto => 'tcp', dport => '43' },
366 ],
367 };
368
369 my $pve_fw_parsed_macros;
370 my $pve_fw_preferred_macro_names = {};
371
372 my $pve_std_chains = {
373 'PVEFW-SET-ACCEPT-MARK' => [
374 "-j MARK --set-mark 1",
375 ],
376 'PVEFW-DropBroadcast' => [
377 # same as shorewall 'Broadcast'
378 # simply DROP BROADCAST/MULTICAST/ANYCAST
379 # we can use this to reduce logging
380 { action => 'DROP', dsttype => 'BROADCAST' },
381 { action => 'DROP', dsttype => 'MULTICAST' },
382 { action => 'DROP', dsttype => 'ANYCAST' },
383 { action => 'DROP', dest => '224.0.0.0/4' },
384 ],
385 'PVEFW-reject' => [
386 # same as shorewall 'reject'
387 { action => 'DROP', dsttype => 'BROADCAST' },
388 { action => 'DROP', source => '224.0.0.0/4' },
389 { action => 'DROP', proto => 'icmp' },
390 "-p tcp -j REJECT --reject-with tcp-reset",
391 "-p udp -j REJECT --reject-with icmp-port-unreachable",
392 "-p icmp -j REJECT --reject-with icmp-host-unreachable",
393 "-j REJECT --reject-with icmp-host-prohibited",
394 ],
395 'PVEFW-Drop' => [
396 # same as shorewall 'Drop', which is equal to DROP,
397 # but REJECT/DROP some packages to reduce logging,
398 # and ACCEPT critical ICMP types
399 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
400 # we are not interested in BROADCAST/MULTICAST/ANYCAST
401 { action => 'PVEFW-DropBroadcast' },
402 # ACCEPT critical ICMP types
403 { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
404 { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
405 # Drop packets with INVALID state
406 "-m conntrack --ctstate INVALID -j DROP",
407 # Drop Microsoft SMB noise
408 { action => 'DROP', proto => 'udp', dport => '135,445', nbdport => 2 },
409 { action => 'DROP', proto => 'udp', dport => '137:139'},
410 { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
411 { action => 'DROP', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
412 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
413 # Drop new/NotSyn traffic so that it doesn't get logged
414 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
415 # Drop DNS replies
416 { action => 'DROP', proto => 'udp', sport => 53 },
417 ],
418 'PVEFW-Reject' => [
419 # same as shorewall 'Reject', which is equal to Reject,
420 # but REJECT/DROP some packages to reduce logging,
421 # and ACCEPT critical ICMP types
422 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
423 # we are not interested in BROADCAST/MULTICAST/ANYCAST
424 { action => 'PVEFW-DropBroadcast' },
425 # ACCEPT critical ICMP types
426 { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
427 { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
428 # Drop packets with INVALID state
429 "-m conntrack --ctstate INVALID -j DROP",
430 # Drop Microsoft SMB noise
431 { action => 'PVEFW-reject', proto => 'udp', dport => '135,445', nbdport => 2 },
432 { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
433 { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
434 { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
435 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
436 # Drop new/NotSyn traffic so that it doesn't get logged
437 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
438 # Drop DNS replies
439 { action => 'DROP', proto => 'udp', sport => 53 },
440 ],
441 'PVEFW-tcpflags' => [
442 # same as shorewall tcpflags action.
443 # Packets arriving on this interface are checked for som illegal combinations of TCP flags
444 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
445 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
446 "-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
447 "-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
448 "-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
449 ],
450 'PVEFW-smurfs' => [
451 # same as shorewall smurfs action
452 # Filter packets for smurfs (packets with a broadcast address as the source).
453 "-s 0.0.0.0/32 -j RETURN",
454 "-m addrtype --src-type BROADCAST -g PVEFW-smurflog",
455 "-s 224.0.0.0/4 -g PVEFW-smurflog",
456 ],
457 };
458
459 # iptables -p icmp -h
460 my $icmp_type_names = {
461 any => 1,
462 'echo-reply' => 1,
463 'destination-unreachable' => 1,
464 'network-unreachable' => 1,
465 'host-unreachable' => 1,
466 'protocol-unreachable' => 1,
467 'port-unreachable' => 1,
468 'fragmentation-needed' => 1,
469 'source-route-failed' => 1,
470 'network-unknown' => 1,
471 'host-unknown' => 1,
472 'network-prohibited' => 1,
473 'host-prohibited' => 1,
474 'TOS-network-unreachable' => 1,
475 'TOS-host-unreachable' => 1,
476 'communication-prohibited' => 1,
477 'host-precedence-violation' => 1,
478 'precedence-cutoff' => 1,
479 'source-quench' => 1,
480 'redirect' => 1,
481 'network-redirect' => 1,
482 'host-redirect' => 1,
483 'TOS-network-redirect' => 1,
484 'TOS-host-redirect' => 1,
485 'echo-request' => 1,
486 'router-advertisement' => 1,
487 'router-solicitation' => 1,
488 'time-exceeded' => 1,
489 'ttl-zero-during-transit' => 1,
490 'ttl-zero-during-reassembly' => 1,
491 'parameter-problem' => 1,
492 'ip-header-bad' => 1,
493 'required-option-missing' => 1,
494 'timestamp-request' => 1,
495 'timestamp-reply' => 1,
496 'address-mask-request' => 1,
497 'address-mask-reply' => 1,
498 };
499
500 sub get_firewall_macros {
501
502 return $pve_fw_parsed_macros if $pve_fw_parsed_macros;
503
504 $pve_fw_parsed_macros = {};
505
506 foreach my $k (keys %$pve_fw_macros) {
507 my $name = lc($k);
508
509 my $macro = $pve_fw_macros->{$k};
510 $pve_fw_preferred_macro_names->{$name} = $k;
511 $pve_fw_parsed_macros->{$name} = $macro;
512 }
513
514 return $pve_fw_parsed_macros;
515 }
516
517 my $etc_services;
518
519 sub get_etc_services {
520
521 return $etc_services if $etc_services;
522
523 my $filename = "/etc/services";
524
525 my $fh = IO::File->new($filename, O_RDONLY);
526 if (!$fh) {
527 warn "unable to read '$filename' - $!\n";
528 return {};
529 }
530
531 my $services = {};
532
533 while (my $line = <$fh>) {
534 chomp ($line);
535 next if $line =~m/^#/;
536 next if ($line =~m/^\s*$/);
537
538 if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp).*$!) {
539 $services->{byid}->{$2}->{name} = $1;
540 $services->{byid}->{$2}->{port} = $2;
541 $services->{byid}->{$2}->{$3} = 1;
542 $services->{byname}->{$1} = $services->{byid}->{$2};
543 }
544 }
545
546 close($fh);
547
548 $etc_services = $services;
549
550
551 return $etc_services;
552 }
553
554 my $etc_protocols;
555
556 sub get_etc_protocols {
557 return $etc_protocols if $etc_protocols;
558
559 my $filename = "/etc/protocols";
560
561 my $fh = IO::File->new($filename, O_RDONLY);
562 if (!$fh) {
563 warn "unable to read '$filename' - $!\n";
564 return {};
565 }
566
567 my $protocols = {};
568
569 while (my $line = <$fh>) {
570 chomp ($line);
571 next if $line =~m/^#/;
572 next if ($line =~m/^\s*$/);
573
574 if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
575 $protocols->{byid}->{$2}->{name} = $1;
576 $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
577 }
578 }
579
580 close($fh);
581
582 $etc_protocols = $protocols;
583
584 return $etc_protocols;
585 }
586
587 sub parse_address_list {
588 my ($str) = @_;
589
590 my $nbaor = 0;
591 foreach my $aor (split(/,/, $str)) {
592 if (!Net::IP->new($aor)) {
593 my $err = Net::IP::Error();
594 die "invalid IP address: $err\n";
595 }else{
596 $nbaor++;
597 }
598 }
599 return $nbaor;
600 }
601
602 sub parse_port_name_number_or_range {
603 my ($str) = @_;
604
605 my $services = PVE::Firewall::get_etc_services();
606 my $nbports = 0;
607 foreach my $item (split(/,/, $str)) {
608 my $portlist = "";
609 my $oldpon = undef;
610 $nbports++;
611 foreach my $pon (split(':', $item, 2)) {
612 $pon = $services->{byname}->{$pon}->{port} if $services->{byname}->{$pon}->{port};
613 if ($pon =~ m/^\d+$/){
614 die "invalid port '$pon'\n" if $pon < 0 && $pon > 65535;
615 die "port '$pon' must be bigger than port '$oldpon' \n" if $oldpon && ($pon < $oldpon);
616 $oldpon = $pon;
617 }else{
618 die "invalid port $services->{byname}->{$pon}\n" if !$services->{byname}->{$pon};
619 }
620 }
621 }
622
623 return ($nbports);
624 }
625
626 my $bridge_firewall_enabled = 0;
627
628 sub enable_bridge_firewall {
629
630 return if $bridge_firewall_enabled; # only once
631
632 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
633 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
634
635 # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
636 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
637
638 $bridge_firewall_enabled = 1;
639 }
640
641 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
642
643 sub iptables {
644 my ($cmd) = @_;
645
646 run_command("/sbin/iptables $cmd", outfunc => sub {}, errfunc => sub {});
647 }
648
649 sub iptables_restore_cmdlist {
650 my ($cmdlist) = @_;
651
652 run_command("/sbin/iptables-restore -n", input => $cmdlist);
653 }
654
655 sub iptables_get_chains {
656
657 my $res = {};
658
659 # check what chains we want to track
660 my $is_pvefw_chain = sub {
661 my $name = shift;
662
663 return 1 if $name =~ m/^PVEFW-\S+$/;
664
665 return 1 if $name =~ m/^tap\d+i\d+-(:?IN|OUT)$/;
666
667 return 1 if $name =~ m/^veth\d+.\d+-(:?IN|OUT)$/; # fixme: dev name is configurable
668
669 return 1 if $name =~ m/^venet0-\d+-(:?IN|OUT)$/;
670
671 return 1 if $name =~ m/^vmbr\d+-(:?FW|IN|OUT)$/;
672 return 1 if $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/;
673
674 return undef;
675 };
676
677 my $table = '';
678
679 my $parser = sub {
680 my $line = shift;
681
682 return if $line =~ m/^#/;
683 return if $line =~ m/^\s*$/;
684
685 if ($line =~ m/^\*(\S+)$/) {
686 $table = $1;
687 return;
688 }
689
690 return if $table ne 'filter';
691
692 if ($line =~ m/^:(\S+)\s/) {
693 my $chain = $1;
694 return if !&$is_pvefw_chain($chain);
695 $res->{$chain} = "unknown";
696 } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
697 my ($chain, $sig) = ($1, $2);
698 return if !&$is_pvefw_chain($chain);
699 $res->{$chain} = $sig;
700 } else {
701 # simply ignore the rest
702 return;
703 }
704 };
705
706 run_command("/sbin/iptables-save", outfunc => $parser);
707
708 return $res;
709 }
710
711 sub iptables_chain_exist {
712 my ($chain) = @_;
713
714 eval{
715 iptables("-n --list $chain");
716 };
717 return undef if $@;
718
719 return 1;
720 }
721
722 sub iptables_rule_exist {
723 my ($rule) = @_;
724
725 eval{
726 iptables("-C $rule");
727 };
728 return undef if $@;
729
730 return 1;
731 }
732
733 sub ruleset_generate_cmdstr {
734 my ($ruleset, $chain, $rule, $actions, $goto) = @_;
735
736 return if $rule->{disable};
737
738 my @cmd = ();
739
740 push @cmd, "-i $rule->{iface_in}" if $rule->{iface_in};
741 push @cmd, "-o $rule->{iface_out}" if $rule->{iface_out};
742
743 push @cmd, "-m iprange --src-range" if $rule->{nbsource} && $rule->{nbsource} > 1;
744 push @cmd, "-s $rule->{source}" if $rule->{source};
745 push @cmd, "-m iprange --dst-range" if $rule->{nbdest} && $rule->{nbdest} > 1;
746 push @cmd, "-d $rule->{dest}" if $rule->{dest};
747
748 if ($rule->{proto}) {
749 push @cmd, "-p $rule->{proto}";
750
751 my $multiport = 0;
752 $multiport++ if $rule->{nbdport} && ($rule->{nbdport} > 1);
753 $multiport++ if $rule->{nbsport} && ($rule->{nbsport} > 1);
754
755 push @cmd, "--match multiport" if $multiport;
756
757 die "multiport: option '--sports' cannot be used together with '--dports'\n"
758 if ($multiport == 2) && ($rule->{dport} ne $rule->{sport});
759
760 if ($rule->{dport}) {
761 if ($rule->{proto} && $rule->{proto} eq 'icmp') {
762 # Note: we use dport to store --icmp-type
763 die "unknown icmp-type '$rule->{dport}'\n" if !defined($icmp_type_names->{$rule->{dport}});
764 push @cmd, "-m icmp --icmp-type $rule->{dport}";
765 } else {
766 if ($rule->{nbdport} && $rule->{nbdport} > 1) {
767 if ($multiport == 2) {
768 push @cmd, "--ports $rule->{dport}";
769 } else {
770 push @cmd, "--dports $rule->{dport}";
771 }
772 } else {
773 push @cmd, "--dport $rule->{dport}";
774 }
775 }
776 }
777
778 if ($rule->{sport}) {
779 if ($rule->{nbsport} && $rule->{nbsport} > 1) {
780 push @cmd, "--sports $rule->{sport}" if $multiport != 2;
781 } else {
782 push @cmd, "--sport $rule->{sport}";
783 }
784 }
785 } elsif ($rule->{dport} || $rule->{sport}) {
786 warn "ignoring destination port '$rule->{dport}' - no protocol specified\n" if $rule->{dport};
787 warn "ignoring source port '$rule->{sport}' - no protocol specified\n" if $rule->{sport};
788 }
789
790 push @cmd, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
791
792 if (my $action = $rule->{action}) {
793 $action = $actions->{$action} if defined($actions->{$action});
794 $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
795 push @cmd, $goto ? "-g $action" : "-j $action";
796 }
797
798 return scalar(@cmd) ? join(' ', @cmd) : undef;
799 }
800
801 sub ruleset_generate_rule {
802 my ($ruleset, $chain, $rule, $actions, $goto) = @_;
803
804 if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $rule, $actions, $goto)) {
805 ruleset_addrule($ruleset, $chain, $cmdstr);
806 }
807 }
808 sub ruleset_generate_rule_insert {
809 my ($ruleset, $chain, $rule, $actions, $goto) = @_;
810
811 if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $rule, $actions, $goto)) {
812 ruleset_insertrule($ruleset, $chain, $cmdstr);
813 }
814 }
815
816 sub ruleset_create_chain {
817 my ($ruleset, $chain) = @_;
818
819 die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
820
821 die "chain '$chain' already exists\n" if $ruleset->{$chain};
822
823 $ruleset->{$chain} = [];
824 }
825
826 sub ruleset_chain_exist {
827 my ($ruleset, $chain) = @_;
828
829 return $ruleset->{$chain} ? 1 : undef;
830 }
831
832 sub ruleset_addrule {
833 my ($ruleset, $chain, $rule) = @_;
834
835 die "no such chain '$chain'\n" if !$ruleset->{$chain};
836
837 push @{$ruleset->{$chain}}, "-A $chain $rule";
838 }
839
840 sub ruleset_insertrule {
841 my ($ruleset, $chain, $rule) = @_;
842
843 die "no such chain '$chain'\n" if !$ruleset->{$chain};
844
845 unshift @{$ruleset->{$chain}}, "-A $chain $rule";
846 }
847
848 sub generate_bridge_chains {
849 my ($ruleset, $hostfw_conf, $bridge, $routing_table) = @_;
850
851 my $options = $hostfw_conf->{options} || {};
852
853 die "error: detected direct route to bridge '$bridge'\n"
854 if !$options->{allow_bridge_route} && $routing_table->{$bridge};
855
856 if (!ruleset_chain_exist($ruleset, "$bridge-FW")) {
857 ruleset_create_chain($ruleset, "$bridge-FW");
858 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -m physdev --physdev-is-bridged -j $bridge-FW");
859 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -m physdev --physdev-is-bridged -j $bridge-FW");
860 }
861
862 if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) {
863 ruleset_create_chain($ruleset, "$bridge-OUT");
864 ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-in -j $bridge-OUT");
865 ruleset_insertrule($ruleset, "PVEFW-INPUT", "-i $bridge -m physdev --physdev-is-bridged --physdev-is-in -j $bridge-OUT");
866 }
867
868 if (!ruleset_chain_exist($ruleset, "$bridge-IN")) {
869 ruleset_create_chain($ruleset, "$bridge-IN");
870 ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-out -j $bridge-IN");
871 ruleset_addrule($ruleset, "$bridge-FW", "-m mark --mark 1 -j ACCEPT");
872 # accept traffic to unmanaged bridge ports
873 ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-out -j ACCEPT ");
874 }
875 }
876
877 sub ruleset_add_chain_policy {
878 my ($ruleset, $chain, $policy, $loglevel, $accept_action) = @_;
879
880 if ($policy eq 'ACCEPT') {
881
882 ruleset_generate_rule($ruleset, $chain, { action => 'ACCEPT' },
883 { ACCEPT => $accept_action});
884
885 } elsif ($policy eq 'DROP') {
886
887 ruleset_addrule($ruleset, $chain, "-j PVEFW-Drop");
888
889 ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"$chain-dropped: \" --log-level $loglevel")
890 if defined($loglevel);
891
892 ruleset_addrule($ruleset, $chain, "-j DROP");
893 } elsif ($policy eq 'REJECT') {
894 ruleset_addrule($ruleset, $chain, "-j PVEFW-Reject");
895
896 ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"$chain-reject: \" --log-level $loglevel")
897 if defined($loglevel);
898
899 ruleset_addrule($ruleset, $chain, "-g PVEFW-reject");
900 } else {
901 # should not happen
902 die "internal error: unknown policy '$policy'";
903 }
904 }
905
906 sub ruleset_create_vm_chain {
907 my ($ruleset, $chain, $options, $macaddr, $direction) = @_;
908
909 ruleset_create_chain($ruleset, $chain);
910
911 if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
912 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
913 }
914
915 if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
916 ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 67:68 -j ACCEPT");
917 }
918
919 if ($options->{tcpflags}) {
920 ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
921 }
922
923 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
924 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
925
926 if ($direction eq 'OUT') {
927 if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
928 ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr -j DROP");
929 }
930 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
931 }
932 }
933
934 sub ruleset_generate_vm_rules {
935 my ($ruleset, $rules, $groups_conf, $chain, $netid, $direction) = @_;
936
937 my $lc_direction = lc($direction);
938
939 foreach my $rule (@$rules) {
940 next if $rule->{iface} && $rule->{iface} ne $netid;
941 next if $rule->{disable};
942 if ($rule->{type} eq 'group') {
943 my $group_chain = "GROUP-$rule->{action}-$direction";
944 if(!ruleset_chain_exist($ruleset, $group_chain)){
945 generate_group_rules($ruleset, $groups_conf, $rule->{action});
946 }
947 ruleset_addrule($ruleset, $chain, "-j $group_chain");
948 ruleset_addrule($ruleset, $chain, "-m mark --mark 1 -j RETURN")
949 if $direction eq 'OUT';
950 } else {
951 next if $rule->{type} ne $lc_direction;
952 if ($direction eq 'OUT') {
953 ruleset_generate_rule($ruleset, $chain, $rule,
954 { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
955 } else {
956 ruleset_generate_rule($ruleset, $chain, $rule, { REJECT => "PVEFW-reject" });
957 }
958 }
959 }
960 }
961
962 sub generate_venet_rules_direction {
963 my ($ruleset, $groups_conf, $vmfw_conf, $vmid, $ip, $direction) = @_;
964
965 parse_address_list($ip); # make sure we have a valid $ip list
966
967 my $lc_direction = lc($direction);
968
969 my $rules = $vmfw_conf->{rules};
970
971 my $options = $vmfw_conf->{options};
972 my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
973
974 my $chain = "venet0-$vmid-$direction";
975
976 ruleset_create_vm_chain($ruleset, $chain, $options, undef, $direction);
977
978 ruleset_generate_vm_rules($ruleset, $rules, $groups_conf, $chain, 'venet', $direction);
979
980 # implement policy
981 my $policy;
982
983 if ($direction eq 'OUT') {
984 $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
985 } else {
986 $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
987 }
988
989 my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : "ACCEPT";
990 ruleset_add_chain_policy($ruleset, $chain, $policy, $loglevel, $accept_action);
991
992 # plug into FORWARD, INPUT and OUTPUT chain
993 if ($direction eq 'OUT') {
994 ruleset_generate_rule_insert($ruleset, "PVEFW-FORWARD", {
995 action => $chain,
996 source => $ip,
997 iface_in => 'venet0'});
998
999 ruleset_generate_rule_insert($ruleset, "PVEFW-INPUT", {
1000 action => $chain,
1001 source => $ip,
1002 iface_in => 'venet0'});
1003 } else {
1004 ruleset_generate_rule($ruleset, "PVEFW-FORWARD", {
1005 action => $chain,
1006 dest => $ip,
1007 iface_out => 'venet0'});
1008
1009 ruleset_generate_rule($ruleset, "PVEFW-OUTPUT", {
1010 action => $chain,
1011 dest => $ip,
1012 iface_out => 'venet0'});
1013 }
1014 }
1015
1016 sub generate_tap_rules_direction {
1017 my ($ruleset, $groups_conf, $iface, $netid, $macaddr, $vmfw_conf, $bridge, $direction) = @_;
1018
1019 my $lc_direction = lc($direction);
1020
1021 my $rules = $vmfw_conf->{rules};
1022
1023 my $options = $vmfw_conf->{options};
1024 my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
1025
1026 my $tapchain = "$iface-$direction";
1027
1028 ruleset_create_vm_chain($ruleset, $tapchain, $options, $macaddr, $direction);
1029
1030 ruleset_generate_vm_rules($ruleset, $rules, $groups_conf, $tapchain, $netid, $direction);
1031
1032 # implement policy
1033 my $policy;
1034
1035 if ($direction eq 'OUT') {
1036 $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1037 } else {
1038 $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1039 }
1040
1041 my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : "ACCEPT";
1042 ruleset_add_chain_policy($ruleset, $tapchain, $policy, $loglevel, $accept_action);
1043
1044 # plug the tap chain to bridge chain
1045 my $physdevdirection = $direction eq 'IN' ? "out" : "in";
1046 my $rule = "-m physdev --physdev-$physdevdirection $iface --physdev-is-bridged -j $tapchain";
1047 ruleset_insertrule($ruleset, "$bridge-$direction", $rule);
1048 }
1049
1050 sub enable_host_firewall {
1051 my ($ruleset, $hostfw_conf, $groups_conf) = @_;
1052
1053 # fixme: allow security groups
1054
1055 my $options = $hostfw_conf->{options};
1056 my $rules = $hostfw_conf->{rules};
1057
1058 # host inbound firewall
1059 my $chain = "PVEFW-HOST-IN";
1060 ruleset_create_chain($ruleset, $chain);
1061
1062 my $loglevel = get_option_log_level($options, "log_level_in");
1063
1064 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1065 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
1066 ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
1067 ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
1068 ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW -m multiport --dports 5404,5405 -j ACCEPT");
1069 ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
1070
1071 # we use RETURN because we need to check also tap rules
1072 my $accept_action = 'RETURN';
1073
1074 foreach my $rule (@$rules) {
1075 next if $rule->{type} ne 'in';
1076 ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
1077 }
1078
1079 # implement input policy
1080 my $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1081 ruleset_add_chain_policy($ruleset, $chain, $policy, $loglevel, $accept_action);
1082
1083 # host outbound firewall
1084 $chain = "PVEFW-HOST-OUT";
1085 ruleset_create_chain($ruleset, $chain);
1086
1087 $loglevel = get_option_log_level($options, "log_level_out");
1088
1089 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1090 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
1091 ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
1092 ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
1093 ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW -m multiport --dports 5404,5405 -j ACCEPT");
1094 ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
1095
1096 # we use RETURN because we may want to check other thigs later
1097 $accept_action = 'RETURN';
1098
1099 foreach my $rule (@$rules) {
1100 next if $rule->{type} ne 'out';
1101 ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
1102 }
1103
1104 # implement output policy
1105 $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1106 ruleset_add_chain_policy($ruleset, $chain, $policy, $loglevel, $accept_action);
1107
1108 ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
1109 ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
1110 }
1111
1112 sub generate_group_rules {
1113 my ($ruleset, $groups_conf, $group) = @_;
1114
1115 die "no such security group '$group'\n" if !$groups_conf->{$group};
1116
1117 my $rules = $groups_conf->{$group}->{rules};
1118
1119 my $chain = "GROUP-${group}-IN";
1120
1121 ruleset_create_chain($ruleset, $chain);
1122
1123 foreach my $rule (@$rules) {
1124 next if $rule->{type} ne 'in';
1125 ruleset_generate_rule($ruleset, $chain, $rule, { REJECT => "PVEFW-reject" });
1126 }
1127
1128 $chain = "GROUP-${group}-OUT";
1129
1130 ruleset_create_chain($ruleset, $chain);
1131 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1132
1133 foreach my $rule (@$rules) {
1134 next if $rule->{type} ne 'out';
1135 # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
1136 # check also other tap rules later
1137 ruleset_generate_rule($ruleset, $chain, $rule,
1138 { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" });
1139 }
1140 }
1141
1142 my $MAX_NETS = 32;
1143 my $valid_netdev_names = {};
1144 for (my $i = 0; $i < $MAX_NETS; $i++) {
1145 $valid_netdev_names->{"net$i"} = 1;
1146 }
1147
1148 sub parse_fw_rule {
1149 my ($line, $need_iface, $allow_groups) = @_;
1150
1151 my $macros = get_firewall_macros();
1152 my $protocols = get_etc_protocols();
1153
1154 my ($type, $action, $iface, $source, $dest, $proto, $dport, $sport);
1155
1156 # we can add single line comments to the end of the rule
1157 my $comment = $1 if $line =~ s/#\s*(.*?)\s*$//;
1158
1159 # we can disable a rule when prefixed with '|'
1160 my $disable = 1 if $line =~ s/^\|//;
1161
1162 my @data = split(/\s+/, $line);
1163 my $expected_elements = $need_iface ? 8 : 7;
1164
1165 die "wrong number of rule elements\n" if scalar(@data) > $expected_elements;
1166
1167 if ($need_iface) {
1168 ($type, $action, $iface, $source, $dest, $proto, $dport, $sport) = @data
1169 } else {
1170 ($type, $action, $source, $dest, $proto, $dport, $sport) = @data;
1171 }
1172
1173 die "incomplete rule\n" if ! ($type && $action);
1174
1175 my $macro;
1176 my $macro_name;
1177
1178 $type = lc($type);
1179
1180 if ($type eq 'in' || $type eq 'out') {
1181 if ($action =~ m/^(ACCEPT|DROP|REJECT)$/) {
1182 # OK
1183 } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
1184 ($macro_name, $action) = ($1, $2);
1185 my $lc_macro_name = lc($macro_name);
1186 my $preferred_name = $pve_fw_preferred_macro_names->{$lc_macro_name};
1187 $macro_name = $preferred_name if $preferred_name;
1188 $macro = $macros->{$lc_macro_name};
1189 die "unknown macro '$macro_name'\n" if !$macro;
1190 } else {
1191 die "unknown action '$action'\n";
1192 }
1193 } elsif ($type eq 'group') {
1194 die "wrong number of rule elements\n" if scalar(@data) != 3;
1195 die "groups disabled\n" if !$allow_groups;
1196
1197 die "invalid characters in group name\n" if $action !~ m/^[A-Za-z0-9_\-]+$/;
1198 } else {
1199 die "unknown rule type '$type'\n";
1200 }
1201
1202 if ($need_iface) {
1203 $iface = undef if $iface && $iface eq '-';
1204 }
1205
1206 $proto = undef if $proto && $proto eq '-';
1207 die "unknown protokol '$proto'\n" if $proto &&
1208 !(defined($protocols->{byname}->{$proto}) ||
1209 defined($protocols->{byid}->{$proto}));
1210
1211 $source = undef if $source && $source eq '-';
1212 $dest = undef if $dest && $dest eq '-';
1213
1214 $dport = undef if $dport && $dport eq '-';
1215 $sport = undef if $sport && $sport eq '-';
1216
1217 my $nbsource = undef;
1218 my $nbdest = undef;
1219
1220 $nbsource = parse_address_list($source) if $source;
1221 $nbdest = parse_address_list($dest) if $dest;
1222
1223 my $rules = [];
1224
1225 my $param = {
1226 type => $type,
1227 disable => $disable,
1228 comment => $comment,
1229 action => $action,
1230 iface => $iface,
1231 source => $source,
1232 dest => $dest,
1233 nbsource => $nbsource,
1234 nbdest => $nbdest,
1235 proto => $proto,
1236 dport => $dport,
1237 sport => $sport,
1238 };
1239
1240 if ($macro) {
1241 foreach my $templ (@$macro) {
1242 my $rule = {};
1243 my $param_used = {};
1244 foreach my $k (keys %$templ) {
1245 my $v = $templ->{$k};
1246 if ($v eq 'PARAM') {
1247 $v = $param->{$k};
1248 $param_used->{$k} = 1;
1249 } elsif ($v eq 'DEST') {
1250 $v = $param->{dest};
1251 $param_used->{dest} = 1;
1252 } elsif ($v eq 'SOURCE') {
1253 $v = $param->{source};
1254 $param_used->{source} = 1;
1255 }
1256
1257 die "missing parameter '$k' in macro '$macro_name'\n" if !defined($v);
1258 $rule->{$k} = $v;
1259 }
1260 foreach my $k (keys %$param) {
1261 next if !defined($param->{$k});
1262 next if $param_used->{$k};
1263 if (defined($rule->{$k})) {
1264 die "parameter '$k' already define in macro (value = '$rule->{$k}')\n"
1265 if $rule->{$k} ne $param->{$k};
1266 } else {
1267 $rule->{$k} = $param->{$k};
1268 }
1269 }
1270 push @$rules, $rule;
1271 }
1272 } else {
1273 push @$rules, $param;
1274 }
1275
1276 foreach my $rule (@$rules) {
1277 $rule->{nbdport} = parse_port_name_number_or_range($rule->{dport})
1278 if defined($rule->{dport});
1279 $rule->{nbsport} = parse_port_name_number_or_range($rule->{sport})
1280 if defined($rule->{sport});
1281 }
1282
1283 return $rules;
1284 }
1285
1286 sub parse_vmfw_option {
1287 my ($line) = @_;
1288
1289 my ($opt, $value);
1290
1291 my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1292
1293 if ($line =~ m/^(enable|dhcp|macfilter|nosmurfs|tcpflags):\s*(0|1)\s*$/i) {
1294 $opt = lc($1);
1295 $value = int($2);
1296 } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
1297 $opt = lc($1);
1298 $value = $2 ? lc($3) : '';
1299 } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1300 $opt = lc($1);
1301 $value = uc($3);
1302 } else {
1303 chomp $line;
1304 die "can't parse option '$line'\n"
1305 }
1306
1307 return ($opt, $value);
1308 }
1309
1310 sub parse_hostfw_option {
1311 my ($line) = @_;
1312
1313 my ($opt, $value);
1314
1315 my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1316
1317 if ($line =~ m/^(enable|dhcp|nosmurfs|tcpflags|allow_bridge_route):\s*(0|1)\s*$/i) {
1318 $opt = lc($1);
1319 $value = int($2);
1320 } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
1321 $opt = lc($1);
1322 $value = $2 ? lc($3) : '';
1323 } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1324 $opt = lc($1);
1325 $value = uc($3);
1326 } elsif ($line =~ m/^(nf_conntrack_max):\s*(\d+)\s*$/i) {
1327 $opt = lc($1);
1328 $value = int($2);
1329 } else {
1330 chomp $line;
1331 die "can't parse option '$line'\n"
1332 }
1333
1334 return ($opt, $value);
1335 }
1336
1337 sub parse_vm_fw_rules {
1338 my ($filename, $fh) = @_;
1339
1340 my $res = { rules => [], options => {}};
1341
1342 my $section;
1343
1344 while (defined(my $line = <$fh>)) {
1345 next if $line =~ m/^#/;
1346 next if $line =~ m/^\s*$/;
1347
1348 my $linenr = $fh->input_line_number();
1349 my $prefix = "$filename (line $linenr)";
1350
1351 if ($line =~ m/^\[(\S+)\]\s*$/i) {
1352 $section = lc($1);
1353 warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1354 next;
1355 }
1356 if (!$section) {
1357 warn "$prefix: skip line - no section";
1358 next;
1359 }
1360
1361 next if !$res->{$section}; # skip undefined section
1362
1363 if ($section eq 'options') {
1364 eval {
1365 my ($opt, $value) = parse_vmfw_option($line);
1366 $res->{options}->{$opt} = $value;
1367 };
1368 warn "$prefix: $@" if $@;
1369 next;
1370 }
1371
1372 my $rules;
1373 eval { $rules = parse_fw_rule($line, 1, 1); };
1374 if (my $err = $@) {
1375 warn "$prefix: $err";
1376 next;
1377 }
1378
1379 push @{$res->{$section}}, @$rules;
1380 }
1381
1382 return $res;
1383 }
1384
1385 sub parse_host_fw_rules {
1386 my ($filename, $fh) = @_;
1387
1388 my $res = { rules => [], options => {}};
1389
1390 my $section;
1391
1392 while (defined(my $line = <$fh>)) {
1393 next if $line =~ m/^#/;
1394 next if $line =~ m/^\s*$/;
1395
1396 my $linenr = $fh->input_line_number();
1397 my $prefix = "$filename (line $linenr)";
1398
1399 if ($line =~ m/^\[(\S+)\]\s*$/i) {
1400 $section = lc($1);
1401 warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1402 next;
1403 }
1404 if (!$section) {
1405 warn "$prefix: skip line - no section";
1406 next;
1407 }
1408
1409 next if !$res->{$section}; # skip undefined section
1410
1411 if ($section eq 'options') {
1412 eval {
1413 my ($opt, $value) = parse_hostfw_option($line);
1414 $res->{options}->{$opt} = $value;
1415 };
1416 warn "$prefix: $@" if $@;
1417 next;
1418 }
1419
1420 my $rules;
1421 eval { $rules = parse_fw_rule($line, 1, 1); };
1422 if (my $err = $@) {
1423 warn "$prefix: $err";
1424 next;
1425 }
1426
1427 push @{$res->{$section}}, @$rules;
1428 }
1429
1430 return $res;
1431 }
1432
1433 sub parse_group_fw_rules {
1434 my ($filename, $fh) = @_;
1435
1436 my $section;
1437 my $group;
1438
1439 my $res = { rules => [] };
1440
1441 while (defined(my $line = <$fh>)) {
1442 next if $line =~ m/^#/;
1443 next if $line =~ m/^\s*$/;
1444
1445 my $linenr = $fh->input_line_number();
1446 my $prefix = "$filename (line $linenr)";
1447
1448 if ($line =~ m/^\[group\s+(\S+)\]\s*$/i) {
1449 $section = 'rules';
1450 $group = lc($1);
1451 next;
1452 }
1453 if (!$section || !$group) {
1454 warn "$prefix: skip line - no section";
1455 next;
1456 }
1457
1458 my $rules;
1459 eval { $rules = parse_fw_rule($line, 0, 0); };
1460 if (my $err = $@) {
1461 warn "$prefix: $err";
1462 next;
1463 }
1464
1465 push @{$res->{$group}->{$section}}, @$rules;
1466 }
1467
1468 return $res;
1469 }
1470
1471 sub run_locked {
1472 my ($code, @param) = @_;
1473
1474 my $timeout = 10;
1475
1476 my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
1477
1478 die $@ if $@;
1479
1480 return $res;
1481 }
1482
1483 sub read_local_vm_config {
1484
1485 my $openvz = {};
1486 my $qemu = {};
1487
1488 my $vmdata = { openvz => $openvz, qemu => $qemu };
1489
1490 my $vmlist = PVE::Cluster::get_vmlist();
1491 return $vmdata if !$vmlist || !$vmlist->{ids};
1492 my $ids = $vmlist->{ids};
1493
1494 foreach my $vmid (keys %$ids) {
1495 next if !$vmid; # skip VE0
1496 my $d = $ids->{$vmid};
1497 next if !$d->{node} || $d->{node} ne $nodename;
1498 next if !$d->{type};
1499 if ($d->{type} eq 'openvz') {
1500 my $cfspath = PVE::OpenVZ::cfs_config_path($vmid);
1501 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
1502 $openvz->{$vmid} = $conf;
1503 }
1504 } elsif ($d->{type} eq 'qemu') {
1505 my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
1506 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
1507 $qemu->{$vmid} = $conf;
1508 }
1509 }
1510 }
1511
1512 return $vmdata;
1513 };
1514
1515 sub read_vm_firewall_configs {
1516 my ($vmdata) = @_;
1517 my $vmfw_configs = {};
1518
1519 foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
1520 my $filename = "/etc/pve/firewall/$vmid.fw";
1521 my $fh = IO::File->new($filename, O_RDONLY);
1522 next if !$fh;
1523
1524 $vmfw_configs->{$vmid} = parse_vm_fw_rules($filename, $fh);
1525 }
1526
1527 return $vmfw_configs;
1528 }
1529
1530 sub get_option_log_level {
1531 my ($options, $k) = @_;
1532
1533 my $v = $options->{$k};
1534 $v = $default_log_level if !defined($v);
1535
1536 return undef if $v eq '' || $v eq 'nolog';
1537
1538 $v = $log_level_hash->{$v} if defined($log_level_hash->{$v});
1539
1540 return $v if ($v >= 0) && ($v <= 7);
1541
1542 warn "unknown log level ($k = '$v')\n";
1543
1544 return undef;
1545 }
1546
1547 sub generate_std_chains {
1548 my ($ruleset, $options) = @_;
1549
1550 my $loglevel = get_option_log_level($options, 'smurf_log_level');
1551
1552 # same as shorewall smurflog.
1553 if (defined($loglevel)) {
1554 $pve_std_chains-> {'PVEFW-smurflog'} = [
1555 "-j LOG --log-prefix \"smurfs-dropped: \" --log-level $loglevel",
1556 "-j DROP",
1557 ];
1558 } else {
1559 $pve_std_chains-> {'PVEFW-smurflog'} = [ "-j DROP" ];
1560 }
1561
1562 # same as shorewall logflags action.
1563 $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
1564 if (defined($loglevel)) {
1565 $pve_std_chains-> {'PVEFW-logflags'} = [
1566 "-j LOG --log-prefix \"logflags-dropped: \" --log-level $loglevel --log-ip-options",
1567 "-j DROP",
1568 ];
1569 } else {
1570 $pve_std_chains-> {'PVEFW-logflags'} = [ "-j DROP" ];
1571 }
1572
1573 foreach my $chain (keys %$pve_std_chains) {
1574 ruleset_create_chain($ruleset, $chain);
1575 foreach my $rule (@{$pve_std_chains->{$chain}}) {
1576 if (ref($rule)) {
1577 ruleset_generate_rule($ruleset, $chain, $rule);
1578 } else {
1579 ruleset_addrule($ruleset, $chain, $rule);
1580 }
1581 }
1582 }
1583 }
1584
1585 sub save_pvefw_status {
1586 my ($status) = @_;
1587
1588 die "unknown status '$status' - internal error"
1589 if $status !~ m/^(stopped|active)$/;
1590
1591 mkdir dirname($pve_fw_status_filename);
1592 PVE::Tools::file_set_contents($pve_fw_status_filename, $status);
1593 }
1594
1595 sub read_pvefw_status {
1596
1597 my $status = 'unknown';
1598
1599 return 'stopped' if ! -f $pve_fw_status_filename;
1600
1601 eval {
1602 $status = PVE::Tools::file_get_contents($pve_fw_status_filename);
1603 };
1604 warn $@ if $@;
1605
1606 return $status;
1607 }
1608
1609 # fixme: move to pve-common PVE::ProcFSTools
1610 sub read_proc_net_route {
1611 my $filename = "/proc/net/route";
1612
1613 my $res = {};
1614
1615 my $fh = IO::File->new ($filename, "r");
1616 return $res if !$fh;
1617
1618 my $int_to_quad = sub {
1619 return join '.' => map { ($_[0] >> 8*(3-$_)) % 256 } (3, 2, 1, 0);
1620 };
1621
1622 while (defined(my $line = <$fh>)) {
1623 next if $line =~/^Iface\s+Destination/; # skip head
1624 my ($iface, $dest, $gateway, $metric, $mask, $mtu) = (split(/\s+/, $line))[0,1,2,6,7,8];
1625 push @{$res->{$iface}}, {
1626 dest => &$int_to_quad(hex($dest)),
1627 gateway => &$int_to_quad(hex($gateway)),
1628 mask => &$int_to_quad(hex($mask)),
1629 metric => $metric,
1630 mtu => $mtu,
1631 };
1632 }
1633
1634 return $res;
1635 }
1636
1637 sub compile {
1638 my $vmdata = read_local_vm_config();
1639 my $vmfw_configs = read_vm_firewall_configs($vmdata);
1640
1641 my $routing_table = read_proc_net_route();
1642
1643 my $groups_conf = {};
1644 my $filename = "/etc/pve/firewall/groups.fw";
1645 if (my $fh = IO::File->new($filename, O_RDONLY)) {
1646 $groups_conf = parse_group_fw_rules($filename, $fh);
1647 }
1648
1649 my $ruleset = {};
1650
1651 ruleset_create_chain($ruleset, "PVEFW-INPUT");
1652 ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
1653
1654 ruleset_create_chain($ruleset, "PVEFW-FORWARD");
1655
1656 my $hostfw_options = {};
1657 my $hostfw_conf = {};
1658
1659 $filename = "/etc/pve/local/host.fw";
1660 if (my $fh = IO::File->new($filename, O_RDONLY)) {
1661 $hostfw_conf = parse_host_fw_rules($filename, $fh);
1662 $hostfw_options = $hostfw_conf->{options};
1663 }
1664
1665 generate_std_chains($ruleset, $hostfw_options);
1666
1667 my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
1668
1669 enable_host_firewall($ruleset, $hostfw_conf, $groups_conf) if $hostfw_enable;
1670
1671 # generate firewall rules for QEMU VMs
1672 foreach my $vmid (keys %{$vmdata->{qemu}}) {
1673 my $conf = $vmdata->{qemu}->{$vmid};
1674 my $vmfw_conf = $vmfw_configs->{$vmid};
1675 next if !$vmfw_conf;
1676 next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
1677
1678 foreach my $netid (keys %$conf) {
1679 next if $netid !~ m/^net(\d+)$/;
1680 my $net = PVE::QemuServer::parse_net($conf->{$netid});
1681 next if !$net;
1682 my $iface = "tap${vmid}i$1";
1683
1684 my $bridge = $net->{bridge};
1685 next if !$bridge; # fixme: ?
1686
1687 $bridge .= "v$net->{tag}" if $net->{tag};
1688
1689 generate_bridge_chains($ruleset, $hostfw_conf, $bridge, $routing_table);
1690
1691 my $macaddr = $net->{macaddr};
1692 generate_tap_rules_direction($ruleset, $groups_conf, $iface, $netid, $macaddr, $vmfw_conf, $bridge, 'IN');
1693 generate_tap_rules_direction($ruleset, $groups_conf, $iface, $netid, $macaddr, $vmfw_conf, $bridge, 'OUT');
1694 }
1695 }
1696
1697 # generate firewall rules for OpenVZ containers
1698 foreach my $vmid (keys %{$vmdata->{openvz}}) {
1699 my $conf = $vmdata->{openvz}->{$vmid};
1700
1701 my $vmfw_conf = $vmfw_configs->{$vmid};
1702 next if !$vmfw_conf;
1703 next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
1704
1705 if ($conf->{ip_address} && $conf->{ip_address}->{value}) {
1706 my $ip = $conf->{ip_address}->{value};
1707 generate_venet_rules_direction($ruleset, $groups_conf, $vmfw_conf, $vmid, $ip, 'IN');
1708 generate_venet_rules_direction($ruleset, $groups_conf, $vmfw_conf, $vmid, $ip, 'OUT');
1709 }
1710
1711 if ($conf->{netif} && $conf->{netif}->{value}) {
1712 my $netif = PVE::OpenVZ::parse_netif($conf->{netif}->{value});
1713 foreach my $netid (keys %$netif) {
1714 my $d = $netif->{$netid};
1715 my $bridge = $d->{bridge};
1716 if (!$bridge) {
1717 warn "no bridge device for CT $vmid iface '$netid'\n";
1718 next; # fixme?
1719 }
1720
1721 generate_bridge_chains($ruleset, $hostfw_conf, $bridge, $routing_table);
1722
1723 my $macaddr = $d->{host_mac};
1724 my $iface = $d->{host_ifname};
1725 generate_tap_rules_direction($ruleset, $groups_conf, $iface, $netid, $macaddr, $vmfw_conf, $bridge, 'IN');
1726 generate_tap_rules_direction($ruleset, $groups_conf, $iface, $netid, $macaddr, $vmfw_conf, $bridge, 'OUT');
1727 }
1728 }
1729 }
1730
1731 # fixme: this is an optimization? if so, we should also drop INVALID packages?
1732 ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
1733
1734 # fixme: what log level should we use here?
1735 my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
1736
1737 # fixme: should we really block inter-bridge traffic?
1738
1739 # always allow traffic from containers?
1740 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i venet0 -j RETURN");
1741
1742 # disable interbridge routing
1743 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o vmbr+ -j PVEFW-Drop");
1744 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i vmbr+ -j PVEFW-Drop");
1745 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o vmbr+ -j LOG --log-prefix \"PVEFW-FORWARD-dropped \" --log-level $loglevel");
1746 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i vmbr+ -j LOG --log-prefix \"PVEFW-FORWARD-dropped \" --log-level $loglevel");
1747 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o vmbr+ -j DROP");
1748 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i vmbr+ -j DROP");
1749
1750 return wantarray ? ($ruleset, $hostfw_conf) : $ruleset;
1751 }
1752
1753 sub get_ruleset_status {
1754 my ($ruleset, $verbose) = @_;
1755
1756 my $active_chains = iptables_get_chains();
1757
1758 my $statushash = {};
1759
1760 foreach my $chain (sort keys %$ruleset) {
1761 my $digest = Digest::SHA->new('sha1');
1762 foreach my $cmd (@{$ruleset->{$chain}}) {
1763 $digest->add("$cmd\n");
1764 }
1765 my $sig = $digest->b64digest;
1766 $statushash->{$chain}->{sig} = $sig;
1767
1768 my $oldsig = $active_chains->{$chain};
1769 if (!defined($oldsig)) {
1770 $statushash->{$chain}->{action} = 'create';
1771 } else {
1772 if ($oldsig eq $sig) {
1773 $statushash->{$chain}->{action} = 'exists';
1774 } else {
1775 $statushash->{$chain}->{action} = 'update';
1776 }
1777 }
1778 print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
1779 foreach my $cmd (@{$ruleset->{$chain}}) {
1780 print "\t$cmd\n" if $verbose;
1781 }
1782 }
1783
1784 foreach my $chain (sort keys %$active_chains) {
1785 if (!defined($ruleset->{$chain})) {
1786 my $sig = $active_chains->{$chain};
1787 $statushash->{$chain}->{action} = 'delete';
1788 $statushash->{$chain}->{sig} = $sig;
1789 print "delete $chain ($sig)\n" if $verbose;
1790 }
1791 }
1792
1793 return $statushash;
1794 }
1795
1796 sub print_ruleset {
1797 my ($ruleset) = @_;
1798
1799 get_ruleset_status($ruleset, 1);
1800 }
1801
1802 sub print_sig_rule {
1803 my ($chain, $sig) = @_;
1804
1805 # We just use this to store a SHA1 checksum used to detect changes
1806 return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
1807 }
1808
1809 sub get_rulset_cmdlist {
1810 my ($ruleset, $verbose) = @_;
1811
1812 my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
1813
1814 my $statushash = get_ruleset_status($ruleset, $verbose);
1815
1816 # create missing chains first
1817 foreach my $chain (sort keys %$ruleset) {
1818 my $stat = $statushash->{$chain};
1819 die "internal error" if !$stat;
1820 next if $stat->{action} ne 'create';
1821
1822 $cmdlist .= ":$chain - [0:0]\n";
1823 }
1824
1825 my $rule = "INPUT -j PVEFW-INPUT";
1826 if (!PVE::Firewall::iptables_rule_exist($rule)) {
1827 $cmdlist .= "-A $rule\n";
1828 }
1829 $rule = "OUTPUT -j PVEFW-OUTPUT";
1830 if (!PVE::Firewall::iptables_rule_exist($rule)) {
1831 $cmdlist .= "-A $rule\n";
1832 }
1833
1834 $rule = "FORWARD -j PVEFW-FORWARD";
1835 if (!PVE::Firewall::iptables_rule_exist($rule)) {
1836 $cmdlist .= "-A $rule\n";
1837 }
1838
1839 foreach my $chain (sort keys %$ruleset) {
1840 my $stat = $statushash->{$chain};
1841 die "internal error" if !$stat;
1842
1843 if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
1844 $cmdlist .= "-F $chain\n";
1845 foreach my $cmd (@{$ruleset->{$chain}}) {
1846 $cmdlist .= "$cmd\n";
1847 }
1848 $cmdlist .= print_sig_rule($chain, $stat->{sig});
1849 } elsif ($stat->{action} eq 'delete') {
1850 die "internal error"; # this should not happen
1851 } elsif ($stat->{action} eq 'exists') {
1852 # do nothing
1853 } else {
1854 die "internal error - unknown status '$stat->{action}'";
1855 }
1856 }
1857
1858 foreach my $chain (keys %$statushash) {
1859 next if $statushash->{$chain}->{action} ne 'delete';
1860 $cmdlist .= "-F $chain\n";
1861 }
1862 foreach my $chain (keys %$statushash) {
1863 next if $statushash->{$chain}->{action} ne 'delete';
1864 next if $chain eq 'PVEFW-INPUT';
1865 next if $chain eq 'PVEFW-OUTPUT';
1866 next if $chain eq 'PVEFW-FORWARD';
1867 $cmdlist .= "-X $chain\n";
1868 }
1869
1870 $cmdlist .= "COMMIT\n";
1871
1872 return $cmdlist;
1873 }
1874
1875 sub apply_ruleset {
1876 my ($ruleset, $hostfw_conf, $verbose) = @_;
1877
1878 enable_bridge_firewall();
1879
1880 update_nf_conntrack_max($hostfw_conf);
1881
1882 my $cmdlist = get_rulset_cmdlist($ruleset, $verbose);
1883
1884 print $cmdlist if $verbose;
1885
1886 iptables_restore_cmdlist($cmdlist);
1887
1888 # test: re-read status and check if everything is up to date
1889 my $statushash = get_ruleset_status($ruleset);
1890
1891 my $errors;
1892 foreach my $chain (sort keys %$ruleset) {
1893 my $stat = $statushash->{$chain};
1894 if ($stat->{action} ne 'exists') {
1895 warn "unable to update chain '$chain'\n";
1896 $errors = 1;
1897 }
1898 }
1899
1900 die "unable to apply firewall changes\n" if $errors;
1901 }
1902
1903 sub update_nf_conntrack_max {
1904 my ($hostfw_conf) = @_;
1905
1906 my $max = 65536; # reasonable default
1907
1908 my $options = $hostfw_conf->{options} || {};
1909
1910 if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
1911 $max = $options->{nf_conntrack_max};
1912 $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
1913 }
1914
1915 my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
1916 my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
1917
1918 my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
1919
1920 if ($current != $max) {
1921 my $hashsize = int($max/4);
1922 PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
1923 PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
1924 }
1925 }
1926
1927 sub update {
1928 my ($start, $verbose) = @_;
1929
1930 my $code = sub {
1931 my $status = read_pvefw_status();
1932
1933 my ($ruleset, $hostfw_conf) = PVE::Firewall::compile();
1934
1935 if ($start || $status eq 'active') {
1936
1937 save_pvefw_status('active') if ($status ne 'active');
1938
1939 apply_ruleset($ruleset, $hostfw_conf, $verbose);
1940 } else {
1941 print "Firewall not active (status = $status)\n" if $verbose;
1942 }
1943 };
1944
1945 run_locked($code);
1946 }
1947
1948
1949 1;