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[pve-firewall.git] / src / PVE / Firewall.pm
1 package PVE::Firewall;
2
3 use warnings;
4 use strict;
5 use POSIX;
6 use Data::Dumper;
7 use Digest::SHA;
8 use PVE::INotify;
9 use PVE::Exception qw(raise raise_param_exc);
10 use PVE::JSONSchema qw(register_standard_option get_standard_option);
11 use PVE::Cluster;
12 use PVE::ProcFSTools;
13 use PVE::Tools qw($IPV4RE);
14 use File::Basename;
15 use File::Path;
16 use IO::File;
17 use Net::IP;
18 use PVE::Tools qw(run_command lock_file);
19 use Encode;
20
21 my $hostfw_conf_filename = "/etc/pve/local/host.fw";
22 my $clusterfw_conf_filename = "/etc/pve/firewall/cluster.fw";
23
24 # dynamically include PVE::QemuServer and PVE::OpenVZ
25 # to avoid dependency problems
26 my $have_qemu_server;
27 eval {
28 require PVE::QemuServer;
29 $have_qemu_server = 1;
30 };
31
32 my $have_pve_manager;
33 eval {
34 require PVE::OpenVZ;
35 $have_pve_manager = 1;
36 };
37
38 PVE::JSONSchema::register_format('IPv4orCIDR', \&pve_verify_ipv4_or_cidr);
39 sub pve_verify_ipv4_or_cidr {
40 my ($cidr, $noerr) = @_;
41
42 if ($cidr =~ m!^(?:$IPV4RE)(/(\d+))?$!) {
43 return $cidr if Net::IP->new($cidr);
44 return undef if $noerr;
45 die Net::IP::Error() . "\n";
46 }
47 return undef if $noerr;
48 die "value does not look like a valid IP address or CIDR network\n";
49 }
50
51 PVE::JSONSchema::register_standard_option('ipset-name', {
52 description => "IP set name.",
53 type => 'string',
54 pattern => '[A-Za-z][A-Za-z0-9\-\_]+',
55 minLength => 2,
56 maxLength => 20,
57 });
58
59 my $security_group_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
60
61 PVE::JSONSchema::register_standard_option('pve-security-group-name', {
62 description => "Security Group name.",
63 type => 'string',
64 pattern => $security_group_pattern,
65 minLength => 2,
66 maxLength => 20,
67 });
68
69 my $feature_ipset_nomatch = 0;
70 eval {
71 my (undef, undef, $release) = POSIX::uname();
72 if ($release =~ m/^(\d+)\.(\d+)\.\d+-/) {
73 my ($major, $minor) = ($1, $2);
74 $feature_ipset_nomatch = 1 if ($major > 3) ||
75 ($major == 3 && $minor >= 7);
76 }
77
78 };
79
80 use Data::Dumper;
81
82 my $nodename = PVE::INotify::nodename();
83
84 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
85 my $pve_fw_status_filename = "/var/lib/pve-firewall/pvefw.status";
86
87 my $default_log_level = 'info';
88
89 my $log_level_hash = {
90 debug => 7,
91 info => 6,
92 notice => 5,
93 warning => 4,
94 err => 3,
95 crit => 2,
96 alert => 1,
97 emerg => 0,
98 };
99
100 # imported/converted from: /usr/share/shorewall/macro.*
101 my $pve_fw_macros = {
102 'Amanda' => [
103 "Amanda Backup",
104 { action => 'PARAM', proto => 'udp', dport => '10080' },
105 { action => 'PARAM', proto => 'tcp', dport => '10080' },
106 ],
107 'Auth' => [
108 "Auth (identd) traffic",
109 { action => 'PARAM', proto => 'tcp', dport => '113' },
110 ],
111 'BGP' => [
112 "Border Gateway Protocol traffic",
113 { action => 'PARAM', proto => 'tcp', dport => '179' },
114 ],
115 'BitTorrent' => [
116 "BitTorrent traffic for BitTorrent 3.1 and earlier",
117 { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
118 { action => 'PARAM', proto => 'udp', dport => '6881' },
119 ],
120 'BitTorrent32' => [
121 "BitTorrent traffic for BitTorrent 3.2 and later",
122 { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
123 { action => 'PARAM', proto => 'udp', dport => '6881' },
124 ],
125 'CVS' => [
126 "Concurrent Versions System pserver traffic",
127 { action => 'PARAM', proto => 'tcp', dport => '2401' },
128 ],
129 'Citrix' => [
130 "Citrix/ICA traffic (ICA, ICA Browser, CGP)",
131 { action => 'PARAM', proto => 'tcp', dport => '1494' },
132 { action => 'PARAM', proto => 'udp', dport => '1604' },
133 { action => 'PARAM', proto => 'tcp', dport => '2598' },
134 ],
135 'DAAP' => [
136 "Digital Audio Access Protocol traffic (iTunes, Rythmbox daemons)",
137 { action => 'PARAM', proto => 'tcp', dport => '3689' },
138 { action => 'PARAM', proto => 'udp', dport => '3689' },
139 ],
140 'DCC' => [
141 "Distributed Checksum Clearinghouse spam filtering mechanism",
142 { action => 'PARAM', proto => 'tcp', dport => '6277' },
143 ],
144 'DHCPfwd' => [
145 "Forwarded DHCP traffic (bidirectional)",
146 { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
147 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '67:68', sport => '67:68' },
148 ],
149 'DNS' => [
150 "Domain Name System traffic (upd and tcp)",
151 { action => 'PARAM', proto => 'udp', dport => '53' },
152 { action => 'PARAM', proto => 'tcp', dport => '53' },
153 ],
154 'Distcc' => [
155 "Distributed Compiler service",
156 { action => 'PARAM', proto => 'tcp', dport => '3632' },
157 ],
158 'FTP' => [
159 "File Transfer Protocol",
160 { action => 'PARAM', proto => 'tcp', dport => '21' },
161 ],
162 'Finger' => [
163 "Finger protocol (RFC 742)",
164 { action => 'PARAM', proto => 'tcp', dport => '79' },
165 ],
166 'GNUnet' => [
167 "GNUnet secure peer-to-peer networking traffic",
168 { action => 'PARAM', proto => 'tcp', dport => '2086' },
169 { action => 'PARAM', proto => 'udp', dport => '2086' },
170 { action => 'PARAM', proto => 'tcp', dport => '1080' },
171 { action => 'PARAM', proto => 'udp', dport => '1080' },
172 ],
173 'GRE' => [
174 "Generic Routing Encapsulation tunneling protocol (bidirectional)",
175 { action => 'PARAM', proto => '47' },
176 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '47' },
177 ],
178 'Git' => [
179 "Git distributed revision control traffic",
180 { action => 'PARAM', proto => 'tcp', dport => '9418' },
181 ],
182 'HKP' => [
183 "OpenPGP HTTP keyserver protocol traffic",
184 { action => 'PARAM', proto => 'tcp', dport => '11371' },
185 ],
186 'HTTP' => [
187 "Hypertext Transfer Protocol (WWW)",
188 { action => 'PARAM', proto => 'tcp', dport => '80' },
189 ],
190 'HTTPS' => [
191 "Hypertext Transfer Protocol (WWW) over SSL",
192 { action => 'PARAM', proto => 'tcp', dport => '443' },
193 ],
194 'ICPV2' => [
195 "Internet Cache Protocol V2 (Squid) traffic",
196 { action => 'PARAM', proto => 'udp', dport => '3130' },
197 ],
198 'ICQ' => [
199 "AOL Instant Messenger traffic",
200 { action => 'PARAM', proto => 'tcp', dport => '5190' },
201 ],
202 'IMAP' => [
203 "Internet Message Access Protocol",
204 { action => 'PARAM', proto => 'tcp', dport => '143' },
205 ],
206 'IMAPS' => [
207 "Internet Message Access Protocol over SSL",
208 { action => 'PARAM', proto => 'tcp', dport => '993' },
209 ],
210 'IPIP' => [
211 "IPIP capsulation traffic (bidirectional)",
212 { action => 'PARAM', proto => '94' },
213 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '94' },
214 ],
215 'IPsec' => [
216 "IPsec traffic (bidirectional)",
217 { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
218 { action => 'PARAM', proto => '50' },
219 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500', sport => '500' },
220 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '50' },
221 ],
222 'IPsecah' => [
223 "IPsec authentication (AH) traffic (bidirectional)",
224 { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
225 { action => 'PARAM', proto => '51' },
226 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500', sport => '500' },
227 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '51' },
228 ],
229 'IPsecnat' => [
230 "IPsec traffic and Nat-Traversal (bidirectional)",
231 { action => 'PARAM', proto => 'udp', dport => '500' },
232 { action => 'PARAM', proto => 'udp', dport => '4500' },
233 { action => 'PARAM', proto => '50' },
234 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500' },
235 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '4500' },
236 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '50' },
237 ],
238 'IRC' => [
239 "Internet Relay Chat traffic",
240 { action => 'PARAM', proto => 'tcp', dport => '6667' },
241 ],
242 'Jetdirect' => [
243 "HP Jetdirect printing",
244 { action => 'PARAM', proto => 'tcp', dport => '9100' },
245 ],
246 'L2TP' => [
247 "Layer 2 Tunneling Protocol traffic",
248 { action => 'PARAM', proto => 'udp', dport => '1701' },
249 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '1701' },
250 ],
251 'LDAP' => [
252 "Lightweight Directory Access Protocol traffic",
253 { action => 'PARAM', proto => 'tcp', dport => '389' },
254 ],
255 'LDAPS' => [
256 "Secure Lightweight Directory Access Protocol traffic",
257 { action => 'PARAM', proto => 'tcp', dport => '636' },
258 ],
259 'MSNP' => [
260 "Microsoft Notification Protocol",
261 { action => 'PARAM', proto => 'tcp', dport => '1863' },
262 ],
263 'MSSQL' => [
264 "Microsoft SQL Server",
265 { action => 'PARAM', proto => 'tcp', dport => '1433' },
266 ],
267 'Mail' => [
268 "Mail traffic (SMTP, SMTPS, Submission)",
269 { action => 'PARAM', proto => 'tcp', dport => '25' },
270 { action => 'PARAM', proto => 'tcp', dport => '465' },
271 { action => 'PARAM', proto => 'tcp', dport => '587' },
272 ],
273 'Munin' => [
274 "Munin networked resource monitoring traffic",
275 { action => 'PARAM', proto => 'tcp', dport => '4949' },
276 ],
277 'MySQL' => [
278 "MySQL server",
279 { action => 'PARAM', proto => 'tcp', dport => '3306' },
280 ],
281 'NNTP' => [
282 "NNTP traffic (Usenet).",
283 { action => 'PARAM', proto => 'tcp', dport => '119' },
284 ],
285 'NNTPS' => [
286 "Encrypted NNTP traffic (Usenet)",
287 { action => 'PARAM', proto => 'tcp', dport => '563' },
288 ],
289 'NTP' => [
290 "Network Time Protocol (ntpd)",
291 { action => 'PARAM', proto => 'udp', dport => '123' },
292 ],
293 'NTPbi' => [
294 "Bi-directional NTP (for NTP peers)",
295 { action => 'PARAM', proto => 'udp', dport => '123' },
296 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '123' },
297 ],
298 'OSPF' => [
299 "OSPF multicast traffic",
300 { action => 'PARAM', proto => '89' },
301 ],
302 'OpenVPN' => [
303 "OpenVPN traffic",
304 { action => 'PARAM', proto => 'udp', dport => '1194' },
305 ],
306 'PCA' => [
307 "Symantec PCAnywere (tm)",
308 { action => 'PARAM', proto => 'udp', dport => '5632' },
309 { action => 'PARAM', proto => 'tcp', dport => '5631' },
310 ],
311 'POP3' => [
312 "POP3 traffic",
313 { action => 'PARAM', proto => 'tcp', dport => '110' },
314 ],
315 'POP3S' => [
316 "Encrypted POP3 traffic",
317 { action => 'PARAM', proto => 'tcp', dport => '995' },
318 ],
319 'PPtP' => [
320 "Point-to-Point Tunneling Protocol",
321 { action => 'PARAM', proto => '47' },
322 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '47' },
323 { action => 'PARAM', proto => 'tcp', dport => '1723' },
324 ],
325 'Ping' => [
326 "ICMP echo request",
327 { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
328 ],
329 'PostgreSQL' => [
330 "PostgreSQL server",
331 { action => 'PARAM', proto => 'tcp', dport => '5432' },
332 ],
333 'Printer' => [
334 "Line Printer protocol printing",
335 { action => 'PARAM', proto => 'tcp', dport => '515' },
336 ],
337 'RDP' => [
338 "Microsoft Remote Desktop Protocol traffic",
339 { action => 'PARAM', proto => 'tcp', dport => '3389' },
340 ],
341 'RIPbi' => [
342 "Routing Information Protocol (bidirectional)",
343 { action => 'PARAM', proto => 'udp', dport => '520' },
344 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '520' },
345 ],
346 'RNDC' => [
347 "BIND remote management protocol",
348 { action => 'PARAM', proto => 'tcp', dport => '953' },
349 ],
350 'Razor' => [
351 "Razor Antispam System",
352 { action => 'ACCEPT', proto => 'tcp', dport => '2703' },
353 ],
354 'Rdate' => [
355 "Remote time retrieval (rdate)",
356 { action => 'PARAM', proto => 'tcp', dport => '37' },
357 ],
358 'Rsync' => [
359 "Rsync server",
360 { action => 'PARAM', proto => 'tcp', dport => '873' },
361 ],
362 'SANE' => [
363 "SANE network scanning",
364 { action => 'PARAM', proto => 'tcp', dport => '6566' },
365 ],
366 'SMB' => [
367 "Microsoft SMB traffic",
368 { action => 'PARAM', proto => 'udp', dport => '135,445' },
369 { action => 'PARAM', proto => 'udp', dport => '137:139' },
370 { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
371 { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
372 ],
373 'SMBBI' => [
374 "Microsoft SMB traffic (bidirectional)",
375 { action => 'PARAM', proto => 'udp', dport => '135,445' },
376 { action => 'PARAM', proto => 'udp', dport => '137:139' },
377 { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
378 { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
379 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '135,445' },
380 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '137:139' },
381 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '1024:65535', sport => '137' },
382 { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'tcp', dport => '135,139,445' },
383 ],
384 'SMBswat' => [
385 "Samba Web Administration Tool",
386 { action => 'PARAM', proto => 'tcp', dport => '901' },
387 ],
388 'SMTP' => [
389 "Simple Mail Transfer Protocol",
390 { action => 'PARAM', proto => 'tcp', dport => '25' },
391 ],
392 'SMTPS' => [
393 "Encrypted Simple Mail Transfer Protocol",
394 { action => 'PARAM', proto => 'tcp', dport => '465' },
395 ],
396 'SNMP' => [
397 "Simple Network Management Protocol",
398 { action => 'PARAM', proto => 'udp', dport => '161:162' },
399 { action => 'PARAM', proto => 'tcp', dport => '161' },
400 ],
401 'SPAMD' => [
402 "Spam Assassin SPAMD traffic",
403 { action => 'PARAM', proto => 'tcp', dport => '783' },
404 ],
405 'SSH' => [
406 "Secure shell traffic",
407 { action => 'PARAM', proto => 'tcp', dport => '22' },
408 ],
409 'SVN' => [
410 "Subversion server (svnserve)",
411 { action => 'PARAM', proto => 'tcp', dport => '3690' },
412 ],
413 'SixXS' => [
414 "SixXS IPv6 Deployment and Tunnel Broker",
415 { action => 'PARAM', proto => 'tcp', dport => '3874' },
416 { action => 'PARAM', proto => 'udp', dport => '3740' },
417 { action => 'PARAM', proto => '41' },
418 { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
419 ],
420 'Squid' => [
421 "Squid web proxy traffic",
422 { action => 'PARAM', proto => 'tcp', dport => '3128' },
423 ],
424 'Submission' => [
425 "Mail message submission traffic",
426 { action => 'PARAM', proto => 'tcp', dport => '587' },
427 ],
428 'Syslog' => [
429 "Syslog protocol (RFC 5424) traffic",
430 { action => 'PARAM', proto => 'udp', dport => '514' },
431 { action => 'PARAM', proto => 'tcp', dport => '514' },
432 ],
433 'TFTP' => [
434 "Trivial File Transfer Protocol traffic",
435 { action => 'PARAM', proto => 'udp', dport => '69' },
436 ],
437 'Telnet' => [
438 "Telnet traffic",
439 { action => 'PARAM', proto => 'tcp', dport => '23' },
440 ],
441 'Telnets' => [
442 "Telnet over SSL",
443 { action => 'PARAM', proto => 'tcp', dport => '992' },
444 ],
445 'Time' => [
446 "RFC 868 Time protocol",
447 { action => 'PARAM', proto => 'tcp', dport => '37' },
448 ],
449 'Trcrt' => [
450 "Traceroute (for up to 30 hops) traffic",
451 { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
452 { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
453 ],
454 'VNC' => [
455 "VNC traffic for VNC display's 0 - 9",
456 { action => 'PARAM', proto => 'tcp', dport => '5900:5909' },
457 ],
458 'VNCL' => [
459 "VNC traffic from Vncservers to Vncviewers in listen mode",
460 { action => 'PARAM', proto => 'tcp', dport => '5500' },
461 ],
462 'Web' => [
463 "WWW traffic (HTTP and HTTPS)",
464 { action => 'PARAM', proto => 'tcp', dport => '80' },
465 { action => 'PARAM', proto => 'tcp', dport => '443' },
466 ],
467 'Webcache' => [
468 "Web Cache/Proxy traffic (port 8080)",
469 { action => 'PARAM', proto => 'tcp', dport => '8080' },
470 ],
471 'Webmin' => [
472 "Webmin traffic",
473 { action => 'PARAM', proto => 'tcp', dport => '10000' },
474 ],
475 'Whois' => [
476 "Whois (nicname, RFC 3912) traffic",
477 { action => 'PARAM', proto => 'tcp', dport => '43' },
478 ],
479 };
480
481 my $pve_fw_parsed_macros;
482 my $pve_fw_macro_descr;
483 my $pve_fw_preferred_macro_names = {};
484
485 my $pve_std_chains = {
486 'PVEFW-SET-ACCEPT-MARK' => [
487 "-j MARK --set-mark 1",
488 ],
489 'PVEFW-DropBroadcast' => [
490 # same as shorewall 'Broadcast'
491 # simply DROP BROADCAST/MULTICAST/ANYCAST
492 # we can use this to reduce logging
493 { action => 'DROP', dsttype => 'BROADCAST' },
494 { action => 'DROP', dsttype => 'MULTICAST' },
495 { action => 'DROP', dsttype => 'ANYCAST' },
496 { action => 'DROP', dest => '224.0.0.0/4' },
497 ],
498 'PVEFW-reject' => [
499 # same as shorewall 'reject'
500 { action => 'DROP', dsttype => 'BROADCAST' },
501 { action => 'DROP', source => '224.0.0.0/4' },
502 { action => 'DROP', proto => 'icmp' },
503 "-p tcp -j REJECT --reject-with tcp-reset",
504 "-p udp -j REJECT --reject-with icmp-port-unreachable",
505 "-p icmp -j REJECT --reject-with icmp-host-unreachable",
506 "-j REJECT --reject-with icmp-host-prohibited",
507 ],
508 'PVEFW-Drop' => [
509 # same as shorewall 'Drop', which is equal to DROP,
510 # but REJECT/DROP some packages to reduce logging,
511 # and ACCEPT critical ICMP types
512 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
513 # we are not interested in BROADCAST/MULTICAST/ANYCAST
514 { action => 'PVEFW-DropBroadcast' },
515 # ACCEPT critical ICMP types
516 { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
517 { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
518 # Drop packets with INVALID state
519 "-m conntrack --ctstate INVALID -j DROP",
520 # Drop Microsoft SMB noise
521 { action => 'DROP', proto => 'udp', dport => '135,445', nbdport => 2 },
522 { action => 'DROP', proto => 'udp', dport => '137:139'},
523 { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
524 { action => 'DROP', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
525 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
526 # Drop new/NotSyn traffic so that it doesn't get logged
527 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
528 # Drop DNS replies
529 { action => 'DROP', proto => 'udp', sport => 53 },
530 ],
531 'PVEFW-Reject' => [
532 # same as shorewall 'Reject', which is equal to Reject,
533 # but REJECT/DROP some packages to reduce logging,
534 # and ACCEPT critical ICMP types
535 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
536 # we are not interested in BROADCAST/MULTICAST/ANYCAST
537 { action => 'PVEFW-DropBroadcast' },
538 # ACCEPT critical ICMP types
539 { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
540 { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
541 # Drop packets with INVALID state
542 "-m conntrack --ctstate INVALID -j DROP",
543 # Drop Microsoft SMB noise
544 { action => 'PVEFW-reject', proto => 'udp', dport => '135,445', nbdport => 2 },
545 { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
546 { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
547 { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
548 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
549 # Drop new/NotSyn traffic so that it doesn't get logged
550 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
551 # Drop DNS replies
552 { action => 'DROP', proto => 'udp', sport => 53 },
553 ],
554 'PVEFW-tcpflags' => [
555 # same as shorewall tcpflags action.
556 # Packets arriving on this interface are checked for som illegal combinations of TCP flags
557 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
558 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
559 "-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
560 "-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
561 "-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
562 ],
563 'PVEFW-smurfs' => [
564 # same as shorewall smurfs action
565 # Filter packets for smurfs (packets with a broadcast address as the source).
566 "-s 0.0.0.0/32 -j RETURN",
567 "-m addrtype --src-type BROADCAST -g PVEFW-smurflog",
568 "-s 224.0.0.0/4 -g PVEFW-smurflog",
569 ],
570 };
571
572 # iptables -p icmp -h
573 my $icmp_type_names = {
574 any => 1,
575 'echo-reply' => 1,
576 'destination-unreachable' => 1,
577 'network-unreachable' => 1,
578 'host-unreachable' => 1,
579 'protocol-unreachable' => 1,
580 'port-unreachable' => 1,
581 'fragmentation-needed' => 1,
582 'source-route-failed' => 1,
583 'network-unknown' => 1,
584 'host-unknown' => 1,
585 'network-prohibited' => 1,
586 'host-prohibited' => 1,
587 'TOS-network-unreachable' => 1,
588 'TOS-host-unreachable' => 1,
589 'communication-prohibited' => 1,
590 'host-precedence-violation' => 1,
591 'precedence-cutoff' => 1,
592 'source-quench' => 1,
593 'redirect' => 1,
594 'network-redirect' => 1,
595 'host-redirect' => 1,
596 'TOS-network-redirect' => 1,
597 'TOS-host-redirect' => 1,
598 'echo-request' => 1,
599 'router-advertisement' => 1,
600 'router-solicitation' => 1,
601 'time-exceeded' => 1,
602 'ttl-zero-during-transit' => 1,
603 'ttl-zero-during-reassembly' => 1,
604 'parameter-problem' => 1,
605 'ip-header-bad' => 1,
606 'required-option-missing' => 1,
607 'timestamp-request' => 1,
608 'timestamp-reply' => 1,
609 'address-mask-request' => 1,
610 'address-mask-reply' => 1,
611 };
612
613 sub init_firewall_macros {
614
615 $pve_fw_parsed_macros = {};
616
617 foreach my $k (keys %$pve_fw_macros) {
618 my $lc_name = lc($k);
619 my $macro = $pve_fw_macros->{$k};
620 if (!ref($macro->[0])) {
621 $pve_fw_macro_descr->{$k} = shift @$macro;
622 }
623 $pve_fw_preferred_macro_names->{$lc_name} = $k;
624 $pve_fw_parsed_macros->{$k} = $macro;
625 }
626 }
627
628 init_firewall_macros();
629
630 sub get_macros {
631 return wantarray ? ($pve_fw_parsed_macros, $pve_fw_macro_descr): $pve_fw_parsed_macros;
632 }
633
634 my $etc_services;
635
636 sub get_etc_services {
637
638 return $etc_services if $etc_services;
639
640 my $filename = "/etc/services";
641
642 my $fh = IO::File->new($filename, O_RDONLY);
643 if (!$fh) {
644 warn "unable to read '$filename' - $!\n";
645 return {};
646 }
647
648 my $services = {};
649
650 while (my $line = <$fh>) {
651 chomp ($line);
652 next if $line =~m/^#/;
653 next if ($line =~m/^\s*$/);
654
655 if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp).*$!) {
656 $services->{byid}->{$2}->{name} = $1;
657 $services->{byid}->{$2}->{port} = $2;
658 $services->{byid}->{$2}->{$3} = 1;
659 $services->{byname}->{$1} = $services->{byid}->{$2};
660 }
661 }
662
663 close($fh);
664
665 $etc_services = $services;
666
667
668 return $etc_services;
669 }
670
671 my $etc_protocols;
672
673 sub get_etc_protocols {
674 return $etc_protocols if $etc_protocols;
675
676 my $filename = "/etc/protocols";
677
678 my $fh = IO::File->new($filename, O_RDONLY);
679 if (!$fh) {
680 warn "unable to read '$filename' - $!\n";
681 return {};
682 }
683
684 my $protocols = {};
685
686 while (my $line = <$fh>) {
687 chomp ($line);
688 next if $line =~m/^#/;
689 next if ($line =~m/^\s*$/);
690
691 if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
692 $protocols->{byid}->{$2}->{name} = $1;
693 $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
694 }
695 }
696
697 close($fh);
698
699 $etc_protocols = $protocols;
700
701 return $etc_protocols;
702 }
703
704 sub parse_address_list {
705 my ($str) = @_;
706
707 return if $str =~ m/^(\+)(\S+)$/; # ipset ref
708
709 my $count = 0;
710 my $iprange = 0;
711 foreach my $elem (split(/,/, $str)) {
712 $count++;
713 if (!Net::IP->new($elem)) {
714 my $err = Net::IP::Error();
715 die "invalid IP address: $err\n";
716 }
717 $iprange = 1 if $elem =~ m/-/;
718 }
719
720 die "you can use a range in a list\n" if $iprange && $count > 1;
721 }
722
723 sub parse_port_name_number_or_range {
724 my ($str) = @_;
725
726 my $services = PVE::Firewall::get_etc_services();
727 my $count = 0;
728 my $icmp_port = 0;
729
730 foreach my $item (split(/,/, $str)) {
731 $count++;
732 if ($item =~ m/^(\d+):(\d+)$/) {
733 my ($port1, $port2) = ($1, $2);
734 die "invalid port '$port1'\n" if $port1 > 65535;
735 die "invalid port '$port2'\n" if $port2 > 65535;
736 } elsif ($item =~ m/^(\d+)$/) {
737 my $port = $1;
738 die "invalid port '$port'\n" if $port > 65535;
739 } else {
740 if ($icmp_type_names->{$item}) {
741 $icmp_port = 1;
742 } else {
743 die "invalid port '$item'\n" if !$services->{byname}->{$item};
744 }
745 }
746 }
747
748 die "ICPM ports not allowed in port range\n" if $icmp_port && $count > 1;
749
750 return $count;
751 }
752
753 PVE::JSONSchema::register_format('pve-fw-port-spec', \&pve_fw_verify_port_spec);
754 sub pve_fw_verify_port_spec {
755 my ($portstr) = @_;
756
757 parse_port_name_number_or_range($portstr);
758
759 return $portstr;
760 }
761
762 PVE::JSONSchema::register_format('pve-fw-v4addr-spec', \&pve_fw_verify_v4addr_spec);
763 sub pve_fw_verify_v4addr_spec {
764 my ($list) = @_;
765
766 parse_address_list($list);
767
768 return $list;
769 }
770
771 PVE::JSONSchema::register_format('pve-fw-protocol-spec', \&pve_fw_verify_protocol_spec);
772 sub pve_fw_verify_protocol_spec {
773 my ($proto) = @_;
774
775 my $protocols = get_etc_protocols();
776
777 die "unknown protocol '$proto'\n" if $proto &&
778 !(defined($protocols->{byname}->{$proto}) ||
779 defined($protocols->{byid}->{$proto}));
780
781 return $proto;
782 }
783
784
785 # helper function for API
786
787 sub copy_opject_with_digest {
788 my ($object) = @_;
789
790 my $sha = Digest::SHA->new('sha1');
791
792 my $res = {};
793 foreach my $k (sort keys %$object) {
794 my $v = $object->{$k};
795 next if !defined($v);
796 $res->{$k} = $v;
797 $sha->add($k, ':', $v, "\n");
798 }
799
800 my $digest = $sha->b64digest;
801
802 $res->{digest} = $digest;
803
804 return wantarray ? ($res, $digest) : $res;
805 }
806
807 sub copy_list_with_digest {
808 my ($list) = @_;
809
810 my $sha = Digest::SHA->new('sha1');
811
812 my $res = [];
813 foreach my $entry (@$list) {
814 my $data = {};
815 foreach my $k (sort keys %$entry) {
816 my $v = $entry->{$k};
817 next if !defined($v);
818 $data->{$k} = $v;
819 $sha->add($k, ':', $v, "\n");
820 }
821 push @$res, $data;
822 }
823
824 my $digest = $sha->b64digest;
825
826 foreach my $entry (@$res) {
827 $entry->{digest} = $digest;
828 }
829
830 return wantarray ? ($res, $digest) : $res;
831 }
832
833 my $rule_properties = {
834 pos => {
835 description => "Update rule at position <pos>.",
836 type => 'integer',
837 minimum => 0,
838 optional => 1,
839 },
840 digest => get_standard_option('pve-config-digest'),
841 type => {
842 type => 'string',
843 optional => 1,
844 enum => ['in', 'out', 'group'],
845 },
846 action => {
847 description => "Rule action ('ACCEPT', 'DROP', 'REJECT') or security group name.",
848 type => 'string',
849 optional => 1,
850 pattern => $security_group_pattern,
851 maxLength => 20,
852 minLength => 2,
853 },
854 macro => {
855 type => 'string',
856 optional => 1,
857 maxLength => 128,
858 },
859 iface => get_standard_option('pve-iface', { optional => 1 }),
860 source => {
861 type => 'string', format => 'pve-fw-v4addr-spec',
862 optional => 1,
863 },
864 dest => {
865 type => 'string', format => 'pve-fw-v4addr-spec',
866 optional => 1,
867 },
868 proto => {
869 type => 'string', format => 'pve-fw-protocol-spec',
870 optional => 1,
871 },
872 enable => {
873 type => 'boolean',
874 optional => 1,
875 },
876 sport => {
877 type => 'string', format => 'pve-fw-port-spec',
878 optional => 1,
879 },
880 dport => {
881 type => 'string', format => 'pve-fw-port-spec',
882 optional => 1,
883 },
884 comment => {
885 type => 'string',
886 optional => 1,
887 },
888 };
889
890 sub add_rule_properties {
891 my ($properties) = @_;
892
893 foreach my $k (keys %$rule_properties) {
894 my $h = $rule_properties->{$k};
895 # copy data, so that we can modify later without side effects
896 foreach my $opt (keys %$h) { $properties->{$k}->{$opt} = $h->{$opt}; }
897 }
898
899 return $properties;
900 }
901
902 sub delete_rule_properties {
903 my ($rule, $delete_str) = @_;
904
905 foreach my $opt (PVE::Tools::split_list($delete_str)) {
906 raise_param_exc({ 'delete' => "no such property ('$opt')"})
907 if !defined($rule_properties->{$opt});
908 raise_param_exc({ 'delete' => "unable to delete required property '$opt'"})
909 if $opt eq 'type' || $opt eq 'action';
910 delete $rule->{$opt};
911 }
912
913 return $rule;
914 }
915
916 my $apply_macro = sub {
917 my ($macro_name, $param, $verify) = @_;
918
919 my $macro_rules = $pve_fw_parsed_macros->{$macro_name};
920 die "unknown macro '$macro_name'\n" if !$macro_rules; # should not happen
921
922 my $rules = [];
923
924 foreach my $templ (@$macro_rules) {
925 my $rule = {};
926 my $param_used = {};
927 foreach my $k (keys %$templ) {
928 my $v = $templ->{$k};
929 if ($v eq 'PARAM') {
930 $v = $param->{$k};
931 $param_used->{$k} = 1;
932 } elsif ($v eq 'DEST') {
933 $v = $param->{dest};
934 $param_used->{dest} = 1;
935 } elsif ($v eq 'SOURCE') {
936 $v = $param->{source};
937 $param_used->{source} = 1;
938 }
939
940 if (!defined($v)) {
941 my $msg = "missing parameter '$k' in macro '$macro_name'";
942 raise_param_exc({ macro => $msg }) if $verify;
943 die "$msg\n";
944 }
945 $rule->{$k} = $v;
946 }
947 foreach my $k (keys %$param) {
948 next if $k eq 'macro';
949 next if !defined($param->{$k});
950 next if $param_used->{$k};
951 if (defined($rule->{$k})) {
952 if ($rule->{$k} ne $param->{$k}) {
953 my $msg = "parameter '$k' already define in macro (value = '$rule->{$k}')";
954 raise_param_exc({ $k => $msg }) if $verify;
955 die "$msg\n";
956 }
957 } else {
958 $rule->{$k} = $param->{$k};
959 }
960 }
961 push @$rules, $rule;
962 }
963
964 return $rules;
965 };
966
967 sub verify_rule {
968 my ($rule, $allow_groups) = @_;
969
970 my $type = $rule->{type};
971
972 raise_param_exc({ type => "missing property"}) if !$type;
973 raise_param_exc({ action => "missing property"}) if !$rule->{action};
974
975 if ($type eq 'in' || $type eq 'out') {
976 raise_param_exc({ action => "unknown action '$rule->{action}'"})
977 if $rule->{action} !~ m/^(ACCEPT|DROP|REJECT)$/;
978 } elsif ($type eq 'group') {
979 raise_param_exc({ type => "security groups not allowed"})
980 if !$allow_groups;
981 raise_param_exc({ action => "invalid characters in security group name"})
982 if $rule->{action} !~ m/^${security_group_pattern}$/;
983 } else {
984 raise_param_exc({ type => "unknown rule type '$type'"});
985 }
986
987 # fixme: verify $rule->{iface}?
988
989 if ($rule->{macro}) {
990 my $preferred_name = $pve_fw_preferred_macro_names->{lc($rule->{macro})};
991 raise_param_exc({ macro => "unknown macro '$rule->{macro}'"}) if !$preferred_name;
992 $rule->{macro} = $preferred_name;
993 }
994
995 if ($rule->{dport}) {
996 eval { parse_port_name_number_or_range($rule->{dport}); };
997 raise_param_exc({ dport => $@ }) if $@;
998 }
999
1000 if ($rule->{sport}) {
1001 eval { parse_port_name_number_or_range($rule->{sport}); };
1002 raise_param_exc({ sport => $@ }) if $@;
1003 }
1004
1005 if ($rule->{source}) {
1006 eval { parse_address_list($rule->{source}); };
1007 raise_param_exc({ source => $@ }) if $@;
1008 }
1009
1010 if ($rule->{dest}) {
1011 eval { parse_address_list($rule->{dest}); };
1012 raise_param_exc({ dest => $@ }) if $@;
1013 }
1014
1015 if ($rule->{macro}) {
1016 &$apply_macro($rule->{macro}, $rule, 1);
1017 }
1018
1019 return $rule;
1020 }
1021
1022 sub copy_rule_data {
1023 my ($rule, $param) = @_;
1024
1025 foreach my $k (keys %$rule_properties) {
1026 if (defined(my $v = $param->{$k})) {
1027 if ($v eq '' || $v eq '-') {
1028 delete $rule->{$k};
1029 } else {
1030 $rule->{$k} = $v;
1031 }
1032 } else {
1033 delete $rule->{$k};
1034 }
1035 }
1036
1037 # verify rule now
1038
1039 return $rule;
1040 }
1041
1042 # core functions
1043 my $bridge_firewall_enabled = 0;
1044
1045 sub enable_bridge_firewall {
1046
1047 return if $bridge_firewall_enabled; # only once
1048
1049 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
1050 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
1051
1052 # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
1053 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
1054
1055 $bridge_firewall_enabled = 1;
1056 }
1057
1058 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
1059
1060 sub iptables_restore_cmdlist {
1061 my ($cmdlist) = @_;
1062
1063 run_command("/sbin/iptables-restore -n", input => $cmdlist);
1064 }
1065
1066 sub ipset_restore_cmdlist {
1067 my ($cmdlist) = @_;
1068
1069 run_command("/usr/sbin/ipset restore", input => $cmdlist);
1070 }
1071
1072 sub iptables_get_chains {
1073
1074 my $res = {};
1075
1076 # check what chains we want to track
1077 my $is_pvefw_chain = sub {
1078 my $name = shift;
1079
1080 return 1 if $name =~ m/^PVEFW-\S+$/;
1081
1082 return 1 if $name =~ m/^tap\d+i\d+-(:?IN|OUT)$/;
1083
1084 return 1 if $name =~ m/^veth\d+.\d+-(:?IN|OUT)$/; # fixme: dev name is configurable
1085
1086 return 1 if $name =~ m/^venet0-\d+-(:?IN|OUT)$/;
1087
1088 return 1 if $name =~ m/^vmbr\d+-(:?FW|IN|OUT|IPS)$/;
1089 return 1 if $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/;
1090
1091 return undef;
1092 };
1093
1094 my $table = '';
1095
1096 my $hooks = {};
1097
1098 my $parser = sub {
1099 my $line = shift;
1100
1101 return if $line =~ m/^#/;
1102 return if $line =~ m/^\s*$/;
1103
1104 if ($line =~ m/^\*(\S+)$/) {
1105 $table = $1;
1106 return;
1107 }
1108
1109 return if $table ne 'filter';
1110
1111 if ($line =~ m/^:(\S+)\s/) {
1112 my $chain = $1;
1113 return if !&$is_pvefw_chain($chain);
1114 $res->{$chain} = "unknown";
1115 } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
1116 my ($chain, $sig) = ($1, $2);
1117 return if !&$is_pvefw_chain($chain);
1118 $res->{$chain} = $sig;
1119 } elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD)\s+-j\s+PVEFW-\1$/) {
1120 $hooks->{$1} = 1;
1121 } else {
1122 # simply ignore the rest
1123 return;
1124 }
1125 };
1126
1127 run_command("/sbin/iptables-save", outfunc => $parser);
1128
1129 return wantarray ? ($res, $hooks) : $res;
1130 }
1131
1132 sub iptables_chain_digest {
1133 my ($rules) = @_;
1134 my $digest = Digest::SHA->new('sha1');
1135 foreach my $rule (@$rules) { # order is important
1136 $digest->add($rule);
1137 }
1138 return $digest->b64digest;
1139 }
1140
1141 sub ipset_chain_digest {
1142 my ($rules) = @_;
1143
1144 my $digest = Digest::SHA->new('sha1');
1145 foreach my $rule (sort @$rules) { # note: sorted
1146 $digest->add($rule);
1147 }
1148 return $digest->b64digest;
1149 }
1150
1151 sub ipset_get_chains {
1152
1153 my $res = {};
1154 my $chains = {};
1155
1156 my $parser = sub {
1157 my $line = shift;
1158
1159 return if $line =~ m/^#/;
1160 return if $line =~ m/^\s*$/;
1161 if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
1162 my $chain = $1;
1163 $line =~ s/\s+$//; # delete trailing white space
1164 push @{$chains->{$chain}}, $line;
1165 } else {
1166 # simply ignore the rest
1167 return;
1168 }
1169 };
1170
1171 run_command("/usr/sbin/ipset save", outfunc => $parser);
1172
1173 # compute digest for each chain
1174 foreach my $chain (keys %$chains) {
1175 $res->{$chain} = ipset_chain_digest($chains->{$chain});
1176 }
1177
1178 return $res;
1179 }
1180
1181 sub ruleset_generate_cmdstr {
1182 my ($ruleset, $chain, $rule, $actions, $goto, $cluster_conf) = @_;
1183
1184 return if defined($rule->{enable}) && !$rule->{enable};
1185
1186 die "unable to emit macro - internal error" if $rule->{macro}; # should not happen
1187
1188 my $nbdport = defined($rule->{dport}) ? parse_port_name_number_or_range($rule->{dport}) : 0;
1189 my $nbsport = defined($rule->{sport}) ? parse_port_name_number_or_range($rule->{sport}) : 0;
1190
1191 my @cmd = ();
1192
1193 push @cmd, "-i $rule->{iface_in}" if $rule->{iface_in};
1194 push @cmd, "-o $rule->{iface_out}" if $rule->{iface_out};
1195
1196 my $source = $rule->{source};
1197 my $dest = $rule->{dest};
1198
1199 if ($source) {
1200 if ($source =~ m/^(\+)(\S+)$/) {
1201 die "no such ipset $2" if !$cluster_conf->{ipset}->{$2};
1202 push @cmd, "-m set --match-set PVEFW-$2 src";
1203
1204 } elsif ($source =~ m/\-/){
1205 push @cmd, "-m iprange --src-range $source";
1206
1207 } else {
1208 push @cmd, "-s $source";
1209 }
1210 }
1211
1212 if ($dest) {
1213 if ($dest =~ m/^(\+)(\S+)$/) {
1214 die "no such ipset $2" if !$cluster_conf->{ipset}->{$2};
1215 push @cmd, "-m set --match-set PVEFW-$2 dst";
1216
1217 } elsif ($dest =~ m/^(\d+)\.(\d+).(\d+).(\d+)\-(\d+)\.(\d+).(\d+).(\d+)$/){
1218 push @cmd, "-m iprange --dst-range $dest";
1219
1220 } else {
1221 push @cmd, "-s $dest";
1222 }
1223 }
1224
1225 if ($rule->{proto}) {
1226 push @cmd, "-p $rule->{proto}";
1227
1228 my $multiport = 0;
1229 $multiport++ if $nbdport > 1;
1230 $multiport++ if $nbsport > 1;
1231
1232 push @cmd, "--match multiport" if $multiport;
1233
1234 die "multiport: option '--sports' cannot be used together with '--dports'\n"
1235 if ($multiport == 2) && ($rule->{dport} ne $rule->{sport});
1236
1237 if ($rule->{dport}) {
1238 if ($rule->{proto} && $rule->{proto} eq 'icmp') {
1239 # Note: we use dport to store --icmp-type
1240 die "unknown icmp-type '$rule->{dport}'\n" if !defined($icmp_type_names->{$rule->{dport}});
1241 push @cmd, "-m icmp --icmp-type $rule->{dport}";
1242 } else {
1243 if ($nbdport > 1) {
1244 if ($multiport == 2) {
1245 push @cmd, "--ports $rule->{dport}";
1246 } else {
1247 push @cmd, "--dports $rule->{dport}";
1248 }
1249 } else {
1250 push @cmd, "--dport $rule->{dport}";
1251 }
1252 }
1253 }
1254
1255 if ($rule->{sport}) {
1256 if ($nbsport > 1) {
1257 push @cmd, "--sports $rule->{sport}" if $multiport != 2;
1258 } else {
1259 push @cmd, "--sport $rule->{sport}";
1260 }
1261 }
1262 } elsif ($rule->{dport} || $rule->{sport}) {
1263 warn "ignoring destination port '$rule->{dport}' - no protocol specified\n" if $rule->{dport};
1264 warn "ignoring source port '$rule->{sport}' - no protocol specified\n" if $rule->{sport};
1265 }
1266
1267 push @cmd, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
1268
1269 if (my $action = $rule->{action}) {
1270 $action = $actions->{$action} if defined($actions->{$action});
1271 $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
1272 push @cmd, $goto ? "-g $action" : "-j $action";
1273 }
1274
1275 return scalar(@cmd) ? join(' ', @cmd) : undef;
1276 }
1277
1278 sub ruleset_generate_rule {
1279 my ($ruleset, $chain, $rule, $actions, $goto, $cluster_conf) = @_;
1280
1281 my $rules;
1282
1283 if ($rule->{macro}) {
1284 $rules = &$apply_macro($rule->{macro}, $rule);
1285 } else {
1286 $rules = [ $rule ];
1287 }
1288
1289 foreach my $tmp (@$rules) {
1290 if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $tmp, $actions, $goto, $cluster_conf)) {
1291 ruleset_addrule($ruleset, $chain, $cmdstr);
1292 }
1293 }
1294 }
1295
1296 sub ruleset_generate_rule_insert {
1297 my ($ruleset, $chain, $rule, $actions, $goto) = @_;
1298
1299 die "implement me" if $rule->{macro}; # not implemented, because not needed so far
1300
1301 if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $rule, $actions, $goto)) {
1302 ruleset_insertrule($ruleset, $chain, $cmdstr);
1303 }
1304 }
1305
1306 sub ruleset_create_chain {
1307 my ($ruleset, $chain) = @_;
1308
1309 die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
1310 die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
1311
1312 die "chain '$chain' already exists\n" if $ruleset->{$chain};
1313
1314 $ruleset->{$chain} = [];
1315 }
1316
1317 sub ruleset_chain_exist {
1318 my ($ruleset, $chain) = @_;
1319
1320 return $ruleset->{$chain} ? 1 : undef;
1321 }
1322
1323 sub ruleset_addrule {
1324 my ($ruleset, $chain, $rule) = @_;
1325
1326 die "no such chain '$chain'\n" if !$ruleset->{$chain};
1327
1328 push @{$ruleset->{$chain}}, "-A $chain $rule";
1329 }
1330
1331 sub ruleset_insertrule {
1332 my ($ruleset, $chain, $rule) = @_;
1333
1334 die "no such chain '$chain'\n" if !$ruleset->{$chain};
1335
1336 unshift @{$ruleset->{$chain}}, "-A $chain $rule";
1337 }
1338
1339 sub get_log_rule_base {
1340 my ($chain, $vmid, $msg, $loglevel) = @_;
1341
1342 die "internal error - no log level" if !defined($loglevel);
1343
1344 $vmid = 0 if !defined($vmid);
1345
1346 # Note: we use special format for prefix to pass further
1347 # info to log daemon (VMID, LOGVELEL and CHAIN)
1348
1349 return "-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
1350 }
1351
1352 sub ruleset_addlog {
1353 my ($ruleset, $chain, $vmid, $msg, $loglevel, $rule) = @_;
1354
1355 return if !defined($loglevel);
1356
1357 my $logrule = get_log_rule_base($chain, $vmid, $msg, $loglevel);
1358
1359 $logrule = "$rule $logrule" if defined($rule);
1360
1361 ruleset_addrule($ruleset, $chain, $logrule)
1362 }
1363
1364 sub generate_bridge_chains {
1365 my ($ruleset, $hostfw_conf, $bridge, $routing_table) = @_;
1366
1367 my $options = $hostfw_conf->{options} || {};
1368
1369 die "error: detected direct route to bridge '$bridge'\n"
1370 if !$options->{allow_bridge_route} && $routing_table->{$bridge};
1371
1372 if (!ruleset_chain_exist($ruleset, "$bridge-FW")) {
1373 ruleset_create_chain($ruleset, "$bridge-FW");
1374 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -m physdev --physdev-is-out -j $bridge-FW");
1375 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -m physdev --physdev-is-in -j $bridge-FW");
1376 }
1377
1378 if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) {
1379 ruleset_create_chain($ruleset, "$bridge-OUT");
1380 ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-in -j $bridge-OUT");
1381 ruleset_insertrule($ruleset, "PVEFW-INPUT", "-i $bridge -m physdev --physdev-is-in -j $bridge-OUT");
1382 }
1383
1384 if (!ruleset_chain_exist($ruleset, "$bridge-IN")) {
1385 ruleset_create_chain($ruleset, "$bridge-IN");
1386 ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-out -j $bridge-IN");
1387 ruleset_addrule($ruleset, "$bridge-FW", "-m mark --mark 1 -j ACCEPT");
1388 # accept traffic to unmanaged bridge ports
1389 ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-out -j ACCEPT ");
1390 }
1391 }
1392
1393 sub ruleset_add_chain_policy {
1394 my ($ruleset, $chain, $vmid, $policy, $loglevel, $accept_action) = @_;
1395
1396 if ($policy eq 'ACCEPT') {
1397
1398 ruleset_generate_rule($ruleset, $chain, { action => 'ACCEPT' },
1399 { ACCEPT => $accept_action});
1400
1401 } elsif ($policy eq 'DROP') {
1402
1403 ruleset_addrule($ruleset, $chain, "-j PVEFW-Drop");
1404
1405 ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
1406
1407 ruleset_addrule($ruleset, $chain, "-j DROP");
1408 } elsif ($policy eq 'REJECT') {
1409 ruleset_addrule($ruleset, $chain, "-j PVEFW-Reject");
1410
1411 ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
1412
1413 ruleset_addrule($ruleset, $chain, "-g PVEFW-reject");
1414 } else {
1415 # should not happen
1416 die "internal error: unknown policy '$policy'";
1417 }
1418 }
1419
1420 sub ruleset_create_vm_chain {
1421 my ($ruleset, $chain, $options, $macaddr, $direction) = @_;
1422
1423 ruleset_create_chain($ruleset, $chain);
1424 my $accept = generate_nfqueue($options);
1425
1426 if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
1427 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
1428 }
1429
1430 if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
1431 if ($direction eq 'OUT') {
1432 ruleset_generate_rule($ruleset, $chain, { action => 'PVEFW-SET-ACCEPT-MARK',
1433 proto => 'udp', sport => 68, dport => 67 });
1434 } else {
1435 ruleset_generate_rule($ruleset, $chain, { action => 'ACCEPT',
1436 proto => 'udp', sport => 67, dport => 68 });
1437 }
1438 }
1439
1440 if ($options->{tcpflags}) {
1441 ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
1442 }
1443
1444 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1445 if ($direction eq 'OUT') {
1446 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -g PVEFW-SET-ACCEPT-MARK");
1447 } else {
1448 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j $accept");
1449 }
1450
1451 if ($direction eq 'OUT') {
1452 if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
1453 ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr -j DROP");
1454 }
1455 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1456 }
1457 }
1458
1459 sub ruleset_generate_vm_rules {
1460 my ($ruleset, $rules, $cluster_conf, $chain, $netid, $direction, $options) = @_;
1461
1462 my $lc_direction = lc($direction);
1463
1464 foreach my $rule (@$rules) {
1465 next if $rule->{iface} && $rule->{iface} ne $netid;
1466 next if !$rule->{enable};
1467 if ($rule->{type} eq 'group') {
1468 my $group_chain = "GROUP-$rule->{action}-$direction";
1469 if(!ruleset_chain_exist($ruleset, $group_chain)){
1470 generate_group_rules($ruleset, $cluster_conf, $rule->{action});
1471 }
1472 ruleset_addrule($ruleset, $chain, "-j $group_chain");
1473 if ($direction eq 'OUT'){
1474 ruleset_addrule($ruleset, $chain, "-m mark --mark 1 -j RETURN");
1475 }else{
1476 my $accept = generate_nfqueue($options);
1477 ruleset_addrule($ruleset, $chain, "-m mark --mark 1 -j $accept");
1478 }
1479
1480 } else {
1481 next if $rule->{type} ne $lc_direction;
1482 if ($direction eq 'OUT') {
1483 ruleset_generate_rule($ruleset, $chain, $rule,
1484 { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1485 } else {
1486 my $accept = generate_nfqueue($options);
1487 ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept , REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1488 }
1489 }
1490 }
1491 }
1492
1493 sub generate_nfqueue {
1494 my ($options) = @_;
1495
1496 my $action = "";
1497 if($options->{ips}){
1498 $action = "NFQUEUE";
1499 if($options->{ips_queues} && $options->{ips_queues} =~ m/^(\d+)(:(\d+))?$/) {
1500 if(defined($3) && defined($1)) {
1501 $action .= " --queue-balance $1:$3";
1502 }elsif (defined($1)) {
1503 $action .= " --queue-num $1";
1504 }
1505 }
1506 $action .= " --queue-bypass" if $feature_ipset_nomatch; #need kernel 3.10
1507 }else{
1508 $action = "ACCEPT";
1509 }
1510
1511 return $action;
1512 }
1513
1514 sub ruleset_generate_vm_ipsrules {
1515 my ($ruleset, $options, $direction, $iface, $bridge) = @_;
1516
1517 if ($options->{ips} && $direction eq 'IN') {
1518 my $nfqueue = generate_nfqueue($options);
1519
1520 if (!ruleset_chain_exist($ruleset, "$bridge-IPS")) {
1521 ruleset_create_chain($ruleset, "PVEFW-IPS");
1522 }
1523
1524 if (!ruleset_chain_exist($ruleset, "$bridge-IPS")) {
1525 ruleset_create_chain($ruleset, "$bridge-IPS");
1526 ruleset_insertrule($ruleset, "PVEFW-IPS", "-o $bridge -m physdev --physdev-is-out -j $bridge-IPS");
1527 }
1528
1529 ruleset_addrule($ruleset, "$bridge-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged -j $nfqueue");
1530 }
1531 }
1532
1533 sub generate_venet_rules_direction {
1534 my ($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip, $direction) = @_;
1535
1536 parse_address_list($ip); # make sure we have a valid $ip list
1537
1538 my $lc_direction = lc($direction);
1539
1540 my $rules = $vmfw_conf->{rules};
1541
1542 my $options = $vmfw_conf->{options};
1543 my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
1544
1545 my $chain = "venet0-$vmid-$direction";
1546
1547 ruleset_create_vm_chain($ruleset, $chain, $options, undef, $direction);
1548
1549 ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $chain, 'venet', $direction);
1550
1551 # implement policy
1552 my $policy;
1553
1554 if ($direction eq 'OUT') {
1555 $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1556 } else {
1557 $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1558 }
1559
1560 my $accept = generate_nfqueue($options);
1561 my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
1562 ruleset_add_chain_policy($ruleset, $chain, $vmid, $policy, $loglevel, $accept_action);
1563
1564 # plug into FORWARD, INPUT and OUTPUT chain
1565 if ($direction eq 'OUT') {
1566 ruleset_generate_rule_insert($ruleset, "PVEFW-FORWARD", {
1567 action => $chain,
1568 source => $ip,
1569 iface_in => 'venet0'});
1570
1571 ruleset_generate_rule_insert($ruleset, "PVEFW-INPUT", {
1572 action => $chain,
1573 source => $ip,
1574 iface_in => 'venet0'});
1575 } else {
1576 ruleset_generate_rule($ruleset, "PVEFW-FORWARD", {
1577 action => $chain,
1578 dest => $ip,
1579 iface_out => 'venet0'});
1580
1581 ruleset_generate_rule($ruleset, "PVEFW-OUTPUT", {
1582 action => $chain,
1583 dest => $ip,
1584 iface_out => 'venet0'});
1585 }
1586 }
1587
1588 sub generate_tap_rules_direction {
1589 my ($ruleset, $cluster_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $bridge, $direction) = @_;
1590
1591 my $lc_direction = lc($direction);
1592
1593 my $rules = $vmfw_conf->{rules};
1594
1595 my $options = $vmfw_conf->{options};
1596 my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
1597
1598 my $tapchain = "$iface-$direction";
1599
1600 ruleset_create_vm_chain($ruleset, $tapchain, $options, $macaddr, $direction);
1601
1602 ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $tapchain, $netid, $direction, $options);
1603
1604 ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface, $bridge);
1605
1606 # implement policy
1607 my $policy;
1608
1609 if ($direction eq 'OUT') {
1610 $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1611 } else {
1612 $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1613 }
1614
1615 my $accept = generate_nfqueue($options);
1616 my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
1617 ruleset_add_chain_policy($ruleset, $tapchain, $vmid, $policy, $loglevel, $accept_action);
1618
1619 # plug the tap chain to bridge chain
1620 if ($direction eq 'IN') {
1621 ruleset_insertrule($ruleset, "$bridge-IN",
1622 "-m physdev --physdev-is-bridged --physdev-out $iface -j $tapchain");
1623 } else {
1624 ruleset_insertrule($ruleset, "$bridge-OUT",
1625 "-m physdev --physdev-in $iface -j $tapchain");
1626 }
1627 }
1628
1629 sub enable_host_firewall {
1630 my ($ruleset, $hostfw_conf, $cluster_conf) = @_;
1631
1632 # fixme: allow security groups
1633
1634 my $options = $hostfw_conf->{options};
1635 my $cluster_options = $cluster_conf->{options};
1636 my $rules = $hostfw_conf->{rules};
1637
1638 # host inbound firewall
1639 my $chain = "PVEFW-HOST-IN";
1640 ruleset_create_chain($ruleset, $chain);
1641
1642 my $loglevel = get_option_log_level($options, "log_level_in");
1643
1644 if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
1645 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
1646 }
1647
1648 if ($options->{tcpflags}) {
1649 ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
1650 }
1651
1652 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1653 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
1654 ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
1655 ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
1656 ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW --dport 5404:5405 -j ACCEPT");
1657 ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
1658
1659 # we use RETURN because we need to check also tap rules
1660 my $accept_action = 'RETURN';
1661
1662 foreach my $rule (@$rules) {
1663 next if $rule->{type} ne 'in';
1664 ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1665 }
1666
1667 # implement input policy
1668 my $policy = $cluster_options->{policy_in} || 'DROP'; # allow nothing by default
1669 ruleset_add_chain_policy($ruleset, $chain, 0, $policy, $loglevel, $accept_action);
1670
1671 # host outbound firewall
1672 $chain = "PVEFW-HOST-OUT";
1673 ruleset_create_chain($ruleset, $chain);
1674
1675 $loglevel = get_option_log_level($options, "log_level_out");
1676
1677 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1678 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
1679 ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
1680 ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
1681 ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW --dport 5404:5405 -j ACCEPT");
1682 ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
1683
1684 # we use RETURN because we may want to check other thigs later
1685 $accept_action = 'RETURN';
1686
1687 foreach my $rule (@$rules) {
1688 next if $rule->{type} ne 'out';
1689 ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1690 }
1691
1692 # implement output policy
1693 $policy = $cluster_options->{policy_out} || 'ACCEPT'; # allow everything by default
1694 ruleset_add_chain_policy($ruleset, $chain, 0, $policy, $loglevel, $accept_action);
1695
1696 ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
1697 ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
1698 }
1699
1700 sub generate_group_rules {
1701 my ($ruleset, $cluster_conf, $group) = @_;
1702 die "no such security group '$group'\n" if !$cluster_conf->{groups}->{$group};
1703
1704 my $rules = $cluster_conf->{groups}->{$group};
1705
1706 my $chain = "GROUP-${group}-IN";
1707
1708 ruleset_create_chain($ruleset, $chain);
1709 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1710
1711 foreach my $rule (@$rules) {
1712 next if $rule->{type} ne 'in';
1713 ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1714 }
1715
1716 $chain = "GROUP-${group}-OUT";
1717
1718 ruleset_create_chain($ruleset, $chain);
1719 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1720
1721 foreach my $rule (@$rules) {
1722 next if $rule->{type} ne 'out';
1723 # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
1724 # check also other tap rules later
1725 ruleset_generate_rule($ruleset, $chain, $rule,
1726 { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1727 }
1728 }
1729
1730 my $MAX_NETS = 32;
1731 my $valid_netdev_names = {};
1732 for (my $i = 0; $i < $MAX_NETS; $i++) {
1733 $valid_netdev_names->{"net$i"} = 1;
1734 }
1735
1736 sub parse_fw_rule {
1737 my ($line, $need_iface, $allow_groups) = @_;
1738
1739 my ($type, $action, $iface, $source, $dest, $proto, $dport, $sport);
1740
1741 # we can add single line comments to the end of the rule
1742 my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
1743
1744 # we can disable a rule when prefixed with '|'
1745 my $enable = 1;
1746
1747 $enable = 0 if $line =~ s/^\|//;
1748
1749 my @data = split(/\s+/, $line);
1750 my $expected_elements = $need_iface ? 8 : 7;
1751
1752 die "wrong number of rule elements\n" if scalar(@data) > $expected_elements;
1753
1754 if ($need_iface) {
1755 ($type, $action, $iface, $source, $dest, $proto, $dport, $sport) = @data
1756 } else {
1757 ($type, $action, $source, $dest, $proto, $dport, $sport) = @data;
1758 }
1759
1760 die "incomplete rule\n" if ! ($type && $action);
1761
1762 my $macro;
1763
1764 $type = lc($type);
1765
1766 if ($type eq 'in' || $type eq 'out') {
1767 if ($action =~ m/^(ACCEPT|DROP|REJECT)$/) {
1768 # OK
1769 } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
1770 $action = $2;
1771 my $preferred_name = $pve_fw_preferred_macro_names->{lc($1)};
1772 die "unknown macro '$1'\n" if !$preferred_name;
1773 $macro = $preferred_name;
1774 } else {
1775 die "unknown action '$action'\n";
1776 }
1777 } elsif ($type eq 'group') {
1778 die "wrong number of rule elements\n" if scalar(@data) != 3;
1779 die "groups disabled\n" if !$allow_groups;
1780
1781 die "invalid characters in group name\n" if $action !~ m/^${security_group_pattern}$/;
1782 } else {
1783 die "unknown rule type '$type'\n";
1784 }
1785
1786 if ($need_iface) {
1787 $iface = undef if $iface && $iface eq '-';
1788 }
1789
1790 $proto = undef if $proto && $proto eq '-';
1791 pve_fw_verify_protocol_spec($proto) if $proto;
1792
1793 $source = undef if $source && $source eq '-';
1794 $dest = undef if $dest && $dest eq '-';
1795
1796 $dport = undef if $dport && $dport eq '-';
1797 $sport = undef if $sport && $sport eq '-';
1798
1799 parse_port_name_number_or_range($dport) if defined($dport);
1800 parse_port_name_number_or_range($sport) if defined($sport);
1801
1802 parse_address_list($source) if $source;
1803 parse_address_list($dest) if $dest;
1804
1805 return {
1806 type => $type,
1807 enable => $enable,
1808 comment => $comment,
1809 action => $action,
1810 macro => $macro,
1811 iface => $iface,
1812 source => $source,
1813 dest => $dest,
1814 proto => $proto,
1815 dport => $dport,
1816 sport => $sport,
1817 };
1818 }
1819
1820 sub parse_vmfw_option {
1821 my ($line) = @_;
1822
1823 my ($opt, $value);
1824
1825 my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1826
1827 if ($line =~ m/^(enable|dhcp|macfilter|nosmurfs|tcpflags|ips):\s*(0|1)\s*$/i) {
1828 $opt = lc($1);
1829 $value = int($2);
1830 } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
1831 $opt = lc($1);
1832 $value = $2 ? lc($3) : '';
1833 } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1834 $opt = lc($1);
1835 $value = uc($3);
1836 } elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
1837 $opt = lc($1);
1838 $value = $2;
1839 } else {
1840 chomp $line;
1841 die "can't parse option '$line'\n"
1842 }
1843
1844 return ($opt, $value);
1845 }
1846
1847 sub parse_hostfw_option {
1848 my ($line) = @_;
1849
1850 my ($opt, $value);
1851
1852 my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1853
1854 if ($line =~ m/^(enable|nosmurfs|tcpflags|allow_bridge_route|optimize):\s*(0|1)\s*$/i) {
1855 $opt = lc($1);
1856 $value = int($2);
1857 } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
1858 $opt = lc($1);
1859 $value = $2 ? lc($3) : '';
1860 } elsif ($line =~ m/^(nf_conntrack_max|nf_conntrack_tcp_timeout_established):\s*(\d+)\s*$/i) {
1861 $opt = lc($1);
1862 $value = int($2);
1863 } else {
1864 chomp $line;
1865 die "can't parse option '$line'\n"
1866 }
1867
1868 return ($opt, $value);
1869 }
1870
1871 sub parse_clusterfw_option {
1872 my ($line) = @_;
1873
1874 my ($opt, $value);
1875
1876 if ($line =~ m/^(enable):\s*(0|1)\s*$/i) {
1877 $opt = lc($1);
1878 $value = int($2);
1879 } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1880 $opt = lc($1);
1881 $value = uc($3);
1882 } else {
1883 chomp $line;
1884 die "can't parse option '$line'\n"
1885 }
1886
1887 return ($opt, $value);
1888 }
1889
1890 sub parse_vm_fw_rules {
1891 my ($filename, $fh) = @_;
1892
1893 my $res = { rules => [], options => {}};
1894
1895 my $section;
1896
1897 while (defined(my $line = <$fh>)) {
1898 next if $line =~ m/^#/;
1899 next if $line =~ m/^\s*$/;
1900
1901 my $linenr = $fh->input_line_number();
1902 my $prefix = "$filename (line $linenr)";
1903
1904 if ($line =~ m/^\[(\S+)\]\s*$/i) {
1905 $section = lc($1);
1906 warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1907 next;
1908 }
1909 if (!$section) {
1910 warn "$prefix: skip line - no section";
1911 next;
1912 }
1913
1914 next if !$res->{$section}; # skip undefined section
1915
1916 if ($section eq 'options') {
1917 eval {
1918 my ($opt, $value) = parse_vmfw_option($line);
1919 $res->{options}->{$opt} = $value;
1920 };
1921 warn "$prefix: $@" if $@;
1922 next;
1923 }
1924
1925 my $rule;
1926 eval { $rule = parse_fw_rule($line, 1, 1); };
1927 if (my $err = $@) {
1928 warn "$prefix: $err";
1929 next;
1930 }
1931
1932 push @{$res->{$section}}, $rule;
1933 }
1934
1935 return $res;
1936 }
1937
1938 sub parse_host_fw_rules {
1939 my ($filename, $fh) = @_;
1940
1941 my $res = { rules => [], options => {}};
1942
1943 my $section;
1944
1945 while (defined(my $line = <$fh>)) {
1946 next if $line =~ m/^#/;
1947 next if $line =~ m/^\s*$/;
1948
1949 my $linenr = $fh->input_line_number();
1950 my $prefix = "$filename (line $linenr)";
1951
1952 if ($line =~ m/^\[(\S+)\]\s*$/i) {
1953 $section = lc($1);
1954 warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1955 next;
1956 }
1957 if (!$section) {
1958 warn "$prefix: skip line - no section";
1959 next;
1960 }
1961
1962 next if !$res->{$section}; # skip undefined section
1963
1964 if ($section eq 'options') {
1965 eval {
1966 my ($opt, $value) = parse_hostfw_option($line);
1967 $res->{options}->{$opt} = $value;
1968 };
1969 warn "$prefix: $@" if $@;
1970 next;
1971 }
1972
1973 my $rule;
1974 eval { $rule = parse_fw_rule($line, 1, 1); };
1975 if (my $err = $@) {
1976 warn "$prefix: $err";
1977 next;
1978 }
1979
1980 push @{$res->{$section}}, $rule;
1981 }
1982
1983 return $res;
1984 }
1985
1986 sub parse_cluster_fw_rules {
1987 my ($filename, $fh) = @_;
1988
1989 my $section;
1990 my $group;
1991
1992 my $res = {
1993 rules => [],
1994 options => {},
1995 groups => {},
1996 group_comments => {},
1997 ipset => {} ,
1998 ipset_comments => {},
1999 };
2000
2001 while (defined(my $line = <$fh>)) {
2002 next if $line =~ m/^#/;
2003 next if $line =~ m/^\s*$/;
2004
2005 my $linenr = $fh->input_line_number();
2006 my $prefix = "$filename (line $linenr)";
2007
2008 if ($line =~ m/^\[options\]$/i) {
2009 $section = 'options';
2010 next;
2011 }
2012
2013 if ($line =~ m/^\[group\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i) {
2014 $section = 'groups';
2015 $group = lc($1);
2016 my $comment = $2;
2017 $res->{$section}->{$group} = [];
2018 $res->{group_comments}->{$group} = decode('utf8', $comment)
2019 if $comment;
2020 next;
2021 }
2022
2023 if ($line =~ m/^\[rules\]$/i) {
2024 $section = 'rules';
2025 next;
2026 }
2027
2028 if ($line =~ m/^\[ipset\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i) {
2029 $section = 'ipset';
2030 $group = lc($1);
2031 my $comment = $2;
2032 $res->{$section}->{$group} = [];
2033 $res->{ipset_comments}->{$group} = decode('utf8', $comment)
2034 if $comment;
2035 next;
2036 }
2037
2038 if (!$section) {
2039 warn "$prefix: skip line - no section\n";
2040 next;
2041 }
2042
2043 if ($section eq 'options') {
2044 eval {
2045 my ($opt, $value) = parse_clusterfw_option($line);
2046 $res->{options}->{$opt} = $value;
2047 };
2048 warn "$prefix: $@" if $@;
2049 } elsif ($section eq 'rules') {
2050 my $rule;
2051 eval { $rule = parse_fw_rule($line, 1, 1); };
2052 if (my $err = $@) {
2053 warn "$prefix: $err";
2054 next;
2055 }
2056 push @{$res->{$section}}, $rule;
2057 } elsif ($section eq 'groups') {
2058 my $rule;
2059 eval { $rule = parse_fw_rule($line, 0, 0); };
2060 if (my $err = $@) {
2061 warn "$prefix: $err";
2062 next;
2063 }
2064 push @{$res->{$section}->{$group}}, $rule;
2065 } elsif ($section eq 'ipset') {
2066 # we can add single line comments to the end of the rule
2067 my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
2068
2069 $line =~ m/^(\!)?\s*(\S+)\s*$/;
2070 my $nomatch = $1;
2071 my $cidr = $2;
2072
2073 $cidr =~ s|/32$||;
2074
2075 eval { pve_verify_ipv4_or_cidr($cidr); };
2076 if (my $err = $@) {
2077 warn "$prefix: $cidr - $err";
2078 next;
2079 }
2080
2081 my $entry = { cidr => $cidr };
2082 $entry->{nomatch} = 1 if $nomatch;
2083 $entry->{comment} = $comment if $comment;
2084
2085 push @{$res->{$section}->{$group}}, $entry;
2086 }
2087 }
2088
2089 return $res;
2090 }
2091
2092 sub run_locked {
2093 my ($code, @param) = @_;
2094
2095 my $timeout = 10;
2096
2097 my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
2098
2099 die $@ if $@;
2100
2101 return $res;
2102 }
2103
2104 sub read_local_vm_config {
2105
2106 my $openvz = {};
2107 my $qemu = {};
2108
2109 my $vmdata = { openvz => $openvz, qemu => $qemu };
2110
2111 my $vmlist = PVE::Cluster::get_vmlist();
2112 return $vmdata if !$vmlist || !$vmlist->{ids};
2113 my $ids = $vmlist->{ids};
2114
2115 foreach my $vmid (keys %$ids) {
2116 next if !$vmid; # skip VE0
2117 my $d = $ids->{$vmid};
2118 next if !$d->{node} || $d->{node} ne $nodename;
2119 next if !$d->{type};
2120 if ($d->{type} eq 'openvz') {
2121 if ($have_pve_manager) {
2122 my $cfspath = PVE::OpenVZ::cfs_config_path($vmid);
2123 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2124 $openvz->{$vmid} = $conf;
2125 }
2126 }
2127 } elsif ($d->{type} eq 'qemu') {
2128 if ($have_qemu_server) {
2129 my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
2130 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2131 $qemu->{$vmid} = $conf;
2132 }
2133 }
2134 }
2135 }
2136
2137 return $vmdata;
2138 };
2139
2140 sub load_vmfw_conf {
2141 my ($vmid) = @_;
2142
2143 my $vmfw_conf = {};
2144
2145 my $filename = "/etc/pve/firewall/$vmid.fw";
2146 if (my $fh = IO::File->new($filename, O_RDONLY)) {
2147 $vmfw_conf = parse_vm_fw_rules($filename, $fh);
2148 }
2149
2150 return $vmfw_conf;
2151 }
2152
2153 my $format_rules = sub {
2154 my ($rules, $need_iface) = @_;
2155
2156 my $raw = '';
2157
2158 foreach my $rule (@$rules) {
2159 if ($rule->{type} eq 'in' || $rule->{type} eq 'out' || $rule->{type} eq 'group') {
2160 $raw .= '|' if defined($rule->{enable}) && !$rule->{enable};
2161 $raw .= uc($rule->{type});
2162 if ($rule->{macro}) {
2163 $raw .= " $rule->{macro}($rule->{action})";
2164 } else {
2165 $raw .= " " . $rule->{action};
2166 }
2167 $raw .= " " . ($rule->{iface} || '-') if $need_iface;
2168
2169 if ($rule->{type} ne 'group') {
2170 $raw .= " " . ($rule->{source} || '-');
2171 $raw .= " " . ($rule->{dest} || '-');
2172 $raw .= " " . ($rule->{proto} || '-');
2173 $raw .= " " . ($rule->{dport} || '-');
2174 $raw .= " " . ($rule->{sport} || '-');
2175 }
2176
2177 $raw .= " # " . encode('utf8', $rule->{comment})
2178 if $rule->{comment} && $rule->{comment} !~ m/^\s*$/;
2179 $raw .= "\n";
2180 } else {
2181 die "unknown rule type '$rule->{type}'";
2182 }
2183 }
2184
2185 return $raw;
2186 };
2187
2188 my $format_options = sub {
2189 my ($options) = @_;
2190
2191 my $raw = '';
2192
2193 $raw .= "[OPTIONS]\n\n";
2194 foreach my $opt (keys %$options) {
2195 $raw .= "$opt: $options->{$opt}\n";
2196 }
2197 $raw .= "\n";
2198
2199 return $raw;
2200 };
2201
2202 my $format_ipset = sub {
2203 my ($options) = @_;
2204
2205 my $raw = '';
2206
2207 my $nethash = {};
2208 foreach my $entry (@$options) {
2209 $nethash->{$entry->{cidr}} = $entry;
2210 }
2211
2212 foreach my $cidr (sort keys %$nethash) {
2213 my $entry = $nethash->{$cidr};
2214 my $line = $entry->{nomatch} ? '!' : '';
2215 $line .= $entry->{cidr};
2216 $line .= " # " . encode('utf8', $entry->{comment})
2217 if $entry->{comment} && $entry->{comment} !~ m/^\s*$/;
2218 $raw .= "$line\n";
2219 }
2220
2221 return $raw;
2222 };
2223
2224 sub save_vmfw_conf {
2225 my ($vmid, $vmfw_conf) = @_;
2226
2227 my $raw = '';
2228
2229 my $options = $vmfw_conf->{options};
2230 $raw .= &$format_options($options) if scalar(keys %$options);
2231
2232 my $rules = $vmfw_conf->{rules};
2233 if (scalar(@$rules)) {
2234 $raw .= "[RULES]\n\n";
2235 $raw .= &$format_rules($rules, 1);
2236 $raw .= "\n";
2237 }
2238
2239 my $filename = "/etc/pve/firewall/$vmid.fw";
2240 PVE::Tools::file_set_contents($filename, $raw);
2241 }
2242
2243 sub read_vm_firewall_configs {
2244 my ($vmdata) = @_;
2245 my $vmfw_configs = {};
2246
2247 foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
2248 my $vmfw_conf = load_vmfw_conf($vmid);
2249 next if !$vmfw_conf->{options}; # skip if file does not exists
2250 $vmfw_configs->{$vmid} = $vmfw_conf;
2251 }
2252
2253 return $vmfw_configs;
2254 }
2255
2256 sub get_option_log_level {
2257 my ($options, $k) = @_;
2258
2259 my $v = $options->{$k};
2260 $v = $default_log_level if !defined($v);
2261
2262 return undef if $v eq '' || $v eq 'nolog';
2263
2264 $v = $log_level_hash->{$v} if defined($log_level_hash->{$v});
2265
2266 return $v if ($v >= 0) && ($v <= 7);
2267
2268 warn "unknown log level ($k = '$v')\n";
2269
2270 return undef;
2271 }
2272
2273 sub generate_std_chains {
2274 my ($ruleset, $options) = @_;
2275
2276 my $loglevel = get_option_log_level($options, 'smurf_log_level');
2277
2278 # same as shorewall smurflog.
2279 my $chain = 'PVEFW-smurflog';
2280
2281 push @{$pve_std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
2282 push @{$pve_std_chains->{$chain}}, "-j DROP";
2283
2284 # same as shorewall logflags action.
2285 $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
2286 $chain = 'PVEFW-logflags';
2287 # fixme: is this correctly logged by pvewf-logger? (ther is no --log-ip-options for NFLOG)
2288 push @{$pve_std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
2289 push @{$pve_std_chains->{$chain}}, "-j DROP";
2290
2291 foreach my $chain (keys %$pve_std_chains) {
2292 ruleset_create_chain($ruleset, $chain);
2293 foreach my $rule (@{$pve_std_chains->{$chain}}) {
2294 if (ref($rule)) {
2295 ruleset_generate_rule($ruleset, $chain, $rule);
2296 } else {
2297 ruleset_addrule($ruleset, $chain, $rule);
2298 }
2299 }
2300 }
2301 }
2302
2303 sub generate_ipset_chains {
2304 my ($ipset_ruleset, $fw_conf) = @_;
2305
2306 foreach my $ipset (keys %{$fw_conf->{ipset}}) {
2307 generate_ipset($ipset_ruleset, "PVEFW-$ipset", $fw_conf->{ipset}->{$ipset});
2308 }
2309 }
2310
2311 sub generate_ipset {
2312 my ($ipset_ruleset, $name, $options) = @_;
2313
2314 my $hashsize = scalar(@$options);
2315 if ($hashsize <= 64) {
2316 $hashsize = 64;
2317 } else {
2318 $hashsize = round_powerof2($hashsize);
2319 }
2320
2321 push @{$ipset_ruleset->{$name}}, "create $name hash:net family inet hashsize $hashsize maxelem $hashsize";
2322
2323 # remove duplicates
2324 my $nethash = {};
2325 foreach my $entry (@$options) {
2326 $nethash->{$entry->{cidr}} = $entry;
2327 }
2328
2329 foreach my $cidr (sort keys %$nethash) {
2330 my $entry = $nethash->{$cidr};
2331
2332 my $cmd = "add $name $cidr";
2333 if ($entry->{nomatch}) {
2334 if ($feature_ipset_nomatch) {
2335 push @{$ipset_ruleset->{$name}}, "$cmd nomatch";
2336 } else {
2337 warn "ignore !$cidr - nomatch not supported by kernel\n";
2338 }
2339 } else {
2340 push @{$ipset_ruleset->{$name}}, $cmd;
2341 }
2342 }
2343 }
2344
2345 sub round_powerof2 {
2346 my ($int) = @_;
2347
2348 $int--;
2349 $int |= $int >> $_ foreach (1,2,4,8,16);
2350 return ++$int;
2351 }
2352
2353 sub save_pvefw_status {
2354 my ($status) = @_;
2355
2356 die "unknown status '$status' - internal error"
2357 if $status !~ m/^(stopped|active)$/;
2358
2359 mkdir dirname($pve_fw_status_filename);
2360 PVE::Tools::file_set_contents($pve_fw_status_filename, $status);
2361 }
2362
2363 sub read_pvefw_status {
2364
2365 my $status = 'unknown';
2366
2367 return 'stopped' if ! -f $pve_fw_status_filename;
2368
2369 eval {
2370 $status = PVE::Tools::file_get_contents($pve_fw_status_filename);
2371 };
2372 warn $@ if $@;
2373
2374 return $status;
2375 }
2376
2377 # fixme: move to pve-common PVE::ProcFSTools
2378 sub read_proc_net_route {
2379 my $filename = "/proc/net/route";
2380
2381 my $res = {};
2382
2383 my $fh = IO::File->new ($filename, "r");
2384 return $res if !$fh;
2385
2386 my $int_to_quad = sub {
2387 return join '.' => map { ($_[0] >> 8*(3-$_)) % 256 } (3, 2, 1, 0);
2388 };
2389
2390 while (defined(my $line = <$fh>)) {
2391 next if $line =~/^Iface\s+Destination/; # skip head
2392 my ($iface, $dest, $gateway, $metric, $mask, $mtu) = (split(/\s+/, $line))[0,1,2,6,7,8];
2393 push @{$res->{$iface}}, {
2394 dest => &$int_to_quad(hex($dest)),
2395 gateway => &$int_to_quad(hex($gateway)),
2396 mask => &$int_to_quad(hex($mask)),
2397 metric => $metric,
2398 mtu => $mtu,
2399 };
2400 }
2401
2402 return $res;
2403 }
2404
2405 sub load_clusterfw_conf {
2406
2407 my $cluster_conf = {};
2408 if (my $fh = IO::File->new($clusterfw_conf_filename, O_RDONLY)) {
2409 $cluster_conf = parse_cluster_fw_rules($clusterfw_conf_filename, $fh);
2410 }
2411
2412 return $cluster_conf;
2413 }
2414
2415 sub save_clusterfw_conf {
2416 my ($cluster_conf) = @_;
2417
2418 my $raw = '';
2419
2420 my $options = $cluster_conf->{options};
2421 $raw .= &$format_options($options) if scalar(keys %$options);
2422
2423 foreach my $ipset (sort keys %{$cluster_conf->{ipset}}) {
2424 if (my $comment = $cluster_conf->{ipset_comments}->{$ipset}) {
2425 my $utf8comment = encode('utf8', $comment);
2426 $raw .= "[IPSET $ipset] # $utf8comment\n\n";
2427 } else {
2428 $raw .= "[IPSET $ipset]\n\n";
2429 }
2430 my $options = $cluster_conf->{ipset}->{$ipset};
2431 $raw .= &$format_ipset($options);
2432 $raw .= "\n";
2433 }
2434
2435 my $rules = $cluster_conf->{rules};
2436 if (scalar(@$rules)) {
2437 $raw .= "[RULES]\n\n";
2438 $raw .= &$format_rules($rules, 1);
2439 $raw .= "\n";
2440 }
2441
2442 foreach my $group (sort keys %{$cluster_conf->{groups}}) {
2443 my $rules = $cluster_conf->{groups}->{$group};
2444 if (my $comment = $cluster_conf->{group_comments}->{$group}) {
2445 my $utf8comment = encode('utf8', $comment);
2446 $raw .= "[group $group] # $utf8comment\n\n";
2447 } else {
2448 $raw .= "[group $group]\n\n";
2449 }
2450
2451 $raw .= &$format_rules($rules, 0);
2452 $raw .= "\n";
2453 }
2454
2455 PVE::Tools::file_set_contents($clusterfw_conf_filename, $raw);
2456 }
2457
2458 sub load_hostfw_conf {
2459
2460 my $hostfw_conf = {};
2461 if (my $fh = IO::File->new($hostfw_conf_filename, O_RDONLY)) {
2462 $hostfw_conf = parse_host_fw_rules($hostfw_conf_filename, $fh);
2463 }
2464 return $hostfw_conf;
2465 }
2466
2467 sub save_hostfw_conf {
2468 my ($hostfw_conf) = @_;
2469
2470 my $raw = '';
2471
2472 my $options = $hostfw_conf->{options};
2473 $raw .= &$format_options($options) if scalar(keys %$options);
2474
2475 my $rules = $hostfw_conf->{rules};
2476 if (scalar(@$rules)) {
2477 $raw .= "[RULES]\n\n";
2478 $raw .= &$format_rules($rules, 1);
2479 $raw .= "\n";
2480 }
2481
2482 PVE::Tools::file_set_contents($hostfw_conf_filename, $raw);
2483 }
2484
2485 sub compile {
2486 my ($cluster_conf, $hostfw_conf) = @_;
2487
2488 $cluster_conf = load_clusterfw_conf() if !$cluster_conf;
2489 $hostfw_conf = load_hostfw_conf() if !$hostfw_conf;
2490
2491 my $vmdata = read_local_vm_config();
2492 my $vmfw_configs = read_vm_firewall_configs($vmdata);
2493
2494 my $routing_table = read_proc_net_route();
2495
2496
2497 my $ipset_ruleset = {};
2498 generate_ipset_chains($ipset_ruleset, $cluster_conf);
2499
2500 my $ruleset = {};
2501
2502 ruleset_create_chain($ruleset, "PVEFW-INPUT");
2503 ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
2504
2505 ruleset_create_chain($ruleset, "PVEFW-FORWARD");
2506
2507 my $hostfw_options = $hostfw_conf->{options} || {};
2508
2509 generate_std_chains($ruleset, $hostfw_options);
2510
2511 my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
2512
2513 enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf) if $hostfw_enable;
2514
2515 # generate firewall rules for QEMU VMs
2516 foreach my $vmid (keys %{$vmdata->{qemu}}) {
2517 my $conf = $vmdata->{qemu}->{$vmid};
2518 my $vmfw_conf = $vmfw_configs->{$vmid};
2519 next if !$vmfw_conf;
2520 next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
2521
2522 foreach my $netid (keys %$conf) {
2523 next if $netid !~ m/^net(\d+)$/;
2524 my $net = PVE::QemuServer::parse_net($conf->{$netid});
2525 next if !$net;
2526 my $iface = "tap${vmid}i$1";
2527
2528 my $bridge = $net->{bridge};
2529 next if !$bridge; # fixme: ?
2530
2531 $bridge .= "v$net->{tag}" if $net->{tag};
2532
2533 generate_bridge_chains($ruleset, $hostfw_conf, $bridge, $routing_table);
2534
2535 my $macaddr = $net->{macaddr};
2536 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
2537 $vmfw_conf, $vmid, $bridge, 'IN');
2538 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
2539 $vmfw_conf, $vmid, $bridge, 'OUT');
2540 }
2541 }
2542
2543 # generate firewall rules for OpenVZ containers
2544 foreach my $vmid (keys %{$vmdata->{openvz}}) {
2545 my $conf = $vmdata->{openvz}->{$vmid};
2546
2547 my $vmfw_conf = $vmfw_configs->{$vmid};
2548 next if !$vmfw_conf;
2549 next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
2550
2551 if ($conf->{ip_address} && $conf->{ip_address}->{value}) {
2552 my $ip = $conf->{ip_address}->{value};
2553 generate_venet_rules_direction($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip, 'IN');
2554 generate_venet_rules_direction($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip, 'OUT');
2555 }
2556
2557 if ($conf->{netif} && $conf->{netif}->{value}) {
2558 my $netif = PVE::OpenVZ::parse_netif($conf->{netif}->{value});
2559 foreach my $netid (keys %$netif) {
2560 my $d = $netif->{$netid};
2561 my $bridge = $d->{bridge};
2562 if (!$bridge) {
2563 warn "no bridge device for CT $vmid iface '$netid'\n";
2564 next; # fixme?
2565 }
2566
2567 generate_bridge_chains($ruleset, $hostfw_conf, $bridge, $routing_table);
2568
2569 my $macaddr = $d->{mac};
2570 my $iface = $d->{host_ifname};
2571 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
2572 $vmfw_conf, $vmid, $bridge, 'IN');
2573 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
2574 $vmfw_conf, $vmid, $bridge, 'OUT');
2575 }
2576 }
2577 }
2578
2579 if($hostfw_options->{optimize}){
2580
2581 my $accept = ruleset_chain_exist($ruleset, "PVEFW-IPS") ? "PVEFW-IPS" : "ACCEPT";
2582 ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j $accept");
2583 ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate INVALID -j DROP");
2584 }
2585
2586 # fixme: what log level should we use here?
2587 my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
2588
2589 # fixme: should we really block inter-bridge traffic?
2590
2591 # always allow traffic from containers?
2592 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i venet0 -j RETURN");
2593
2594 # disable interbridge routing
2595 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o vmbr+ -j PVEFW-Drop");
2596 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i vmbr+ -j PVEFW-Drop");
2597 ruleset_addlog($ruleset, "PVEFW-FORWARD", 0, "DROP: ", $loglevel, "-o vmbr+");
2598 ruleset_addlog($ruleset, "PVEFW-FORWARD", 0, "DROP: ", $loglevel, "-i vmbr+");
2599 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o vmbr+ -j DROP");
2600 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i vmbr+ -j DROP");
2601
2602 return ($ruleset, $ipset_ruleset);
2603 }
2604
2605 sub get_ruleset_status {
2606 my ($ruleset, $active_chains, $digest_fn, $verbose) = @_;
2607
2608 my $statushash = {};
2609
2610 foreach my $chain (sort keys %$ruleset) {
2611 my $sig = &$digest_fn($ruleset->{$chain});
2612
2613 $statushash->{$chain}->{sig} = $sig;
2614
2615 my $oldsig = $active_chains->{$chain};
2616 if (!defined($oldsig)) {
2617 $statushash->{$chain}->{action} = 'create';
2618 } else {
2619 if ($oldsig eq $sig) {
2620 $statushash->{$chain}->{action} = 'exists';
2621 } else {
2622 $statushash->{$chain}->{action} = 'update';
2623 }
2624 }
2625 print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
2626 foreach my $cmd (@{$ruleset->{$chain}}) {
2627 print "\t$cmd\n" if $verbose;
2628 }
2629 }
2630
2631 foreach my $chain (sort keys %$active_chains) {
2632 if (!defined($ruleset->{$chain})) {
2633 my $sig = $active_chains->{$chain};
2634 $statushash->{$chain}->{action} = 'delete';
2635 $statushash->{$chain}->{sig} = $sig;
2636 print "delete $chain ($sig)\n" if $verbose;
2637 }
2638 }
2639
2640 return $statushash;
2641 }
2642
2643 sub print_sig_rule {
2644 my ($chain, $sig) = @_;
2645
2646 # We just use this to store a SHA1 checksum used to detect changes
2647 return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
2648 }
2649
2650 sub get_ruleset_cmdlist {
2651 my ($ruleset, $verbose) = @_;
2652
2653 my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
2654
2655 my ($active_chains, $hooks) = iptables_get_chains();
2656 my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, $verbose);
2657
2658 # create missing chains first
2659 foreach my $chain (sort keys %$ruleset) {
2660 my $stat = $statushash->{$chain};
2661 die "internal error" if !$stat;
2662 next if $stat->{action} ne 'create';
2663
2664 $cmdlist .= ":$chain - [0:0]\n";
2665 }
2666
2667 foreach my $h (qw(INPUT OUTPUT FORWARD)) {
2668 if (!$hooks->{$h}) {
2669 $cmdlist .= "-A $h -j PVEFW-$h\n";
2670 }
2671 }
2672
2673 foreach my $chain (sort keys %$ruleset) {
2674 my $stat = $statushash->{$chain};
2675 die "internal error" if !$stat;
2676
2677 if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
2678 $cmdlist .= "-F $chain\n";
2679 foreach my $cmd (@{$ruleset->{$chain}}) {
2680 $cmdlist .= "$cmd\n";
2681 }
2682 $cmdlist .= print_sig_rule($chain, $stat->{sig});
2683 } elsif ($stat->{action} eq 'delete') {
2684 die "internal error"; # this should not happen
2685 } elsif ($stat->{action} eq 'exists') {
2686 # do nothing
2687 } else {
2688 die "internal error - unknown status '$stat->{action}'";
2689 }
2690 }
2691
2692 foreach my $chain (keys %$statushash) {
2693 next if $statushash->{$chain}->{action} ne 'delete';
2694 $cmdlist .= "-F $chain\n";
2695 }
2696 foreach my $chain (keys %$statushash) {
2697 next if $statushash->{$chain}->{action} ne 'delete';
2698 next if $chain eq 'PVEFW-INPUT';
2699 next if $chain eq 'PVEFW-OUTPUT';
2700 next if $chain eq 'PVEFW-FORWARD';
2701 $cmdlist .= "-X $chain\n";
2702 }
2703
2704 my $changes = $cmdlist ne "*filter\n" ? 1 : 0;
2705
2706 $cmdlist .= "COMMIT\n";
2707
2708 return wantarray ? ($cmdlist, $changes) : $cmdlist;
2709 }
2710
2711 sub get_ipset_cmdlist {
2712 my ($ruleset, $verbose) = @_;
2713
2714 my $cmdlist = "";
2715
2716 my $delete_cmdlist = "";
2717
2718 my $active_chains = ipset_get_chains();
2719 my $statushash = get_ruleset_status($ruleset, $active_chains, \&ipset_chain_digest, $verbose);
2720
2721 # remove stale _swap chains
2722 foreach my $chain (keys %$active_chains) {
2723 if ($chain =~ m/^PVEFW-\S+_swap$/) {
2724 $cmdlist .= "destroy $chain\n";
2725 }
2726 }
2727
2728 foreach my $chain (sort keys %$ruleset) {
2729 my $stat = $statushash->{$chain};
2730 die "internal error" if !$stat;
2731
2732 if ($stat->{action} eq 'create') {
2733 foreach my $cmd (@{$ruleset->{$chain}}) {
2734 $cmdlist .= "$cmd\n";
2735 }
2736 }
2737
2738 if ($stat->{action} eq 'update') {
2739 my $chain_swap = $chain."_swap";
2740
2741 foreach my $cmd (@{$ruleset->{$chain}}) {
2742 $cmd =~ s/$chain/$chain_swap/;
2743 $cmdlist .= "$cmd\n";
2744 }
2745 $cmdlist .= "swap $chain_swap $chain\n";
2746 $cmdlist .= "flush $chain_swap\n";
2747 $cmdlist .= "destroy $chain_swap\n";
2748 }
2749
2750 }
2751
2752 foreach my $chain (keys %$statushash) {
2753 next if $statushash->{$chain}->{action} ne 'delete';
2754
2755 $delete_cmdlist .= "flush $chain\n";
2756 $delete_cmdlist .= "destroy $chain\n";
2757 }
2758
2759 my $changes = ($cmdlist || $delete_cmdlist) ? 1 : 0;
2760
2761 return ($cmdlist, $delete_cmdlist, $changes);
2762 }
2763
2764 sub apply_ruleset {
2765 my ($ruleset, $hostfw_conf, $ipset_ruleset, $verbose) = @_;
2766
2767 enable_bridge_firewall();
2768
2769 update_nf_conntrack_max($hostfw_conf);
2770
2771 update_nf_conntrack_tcp_timeout_established($hostfw_conf);
2772
2773 my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
2774 get_ipset_cmdlist($ipset_ruleset, undef, $verbose);
2775
2776 my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset, $verbose);
2777
2778 if ($verbose) {
2779 if ($ipset_changes) {
2780 print "ipset changes:\n";
2781 print $ipset_create_cmdlist if $ipset_create_cmdlist;
2782 print $ipset_delete_cmdlist if $ipset_delete_cmdlist;
2783 }
2784
2785 if ($changes) {
2786 print "iptables changes:\n";
2787 print $cmdlist;
2788 }
2789 }
2790
2791 ipset_restore_cmdlist($ipset_create_cmdlist);
2792
2793 iptables_restore_cmdlist($cmdlist);
2794
2795 ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
2796
2797 # test: re-read status and check if everything is up to date
2798 my $active_chains = iptables_get_chains();
2799 my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, 0);
2800
2801 my $errors;
2802 foreach my $chain (sort keys %$ruleset) {
2803 my $stat = $statushash->{$chain};
2804 if ($stat->{action} ne 'exists') {
2805 warn "unable to update chain '$chain'\n";
2806 $errors = 1;
2807 }
2808 }
2809
2810 die "unable to apply firewall changes\n" if $errors;
2811 }
2812
2813 sub update_nf_conntrack_max {
2814 my ($hostfw_conf) = @_;
2815
2816 my $max = 65536; # reasonable default
2817
2818 my $options = $hostfw_conf->{options} || {};
2819
2820 if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
2821 $max = $options->{nf_conntrack_max};
2822 $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
2823 }
2824
2825 my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
2826 my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
2827
2828 my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
2829
2830 if ($current != $max) {
2831 my $hashsize = int($max/4);
2832 PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
2833 PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
2834 }
2835 }
2836
2837 sub update_nf_conntrack_tcp_timeout_established {
2838 my ($hostfw_conf) = @_;
2839
2840 my $options = $hostfw_conf->{options} || {};
2841
2842 my $value = defined($options->{nf_conntrack_tcp_timeout_established}) ? $options->{nf_conntrack_tcp_timeout_established} : 432000;
2843
2844 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established", $value);
2845 }
2846
2847 sub remove_pvefw_chains {
2848
2849 my ($chash, $hooks) = iptables_get_chains();
2850 my $cmdlist = "*filter\n";
2851
2852 foreach my $h (qw(INPUT OUTPUT FORWARD)) {
2853 if ($hooks->{$h}) {
2854 $cmdlist .= "-D $h -j PVEFW-$h\n";
2855 }
2856 }
2857
2858 foreach my $chain (keys %$chash) {
2859 $cmdlist .= "-F $chain\n";
2860 }
2861
2862 foreach my $chain (keys %$chash) {
2863 $cmdlist .= "-X $chain\n";
2864 }
2865 $cmdlist .= "COMMIT\n";
2866
2867 iptables_restore_cmdlist($cmdlist);
2868 }
2869
2870 sub update {
2871 my ($start, $verbose) = @_;
2872
2873 my $code = sub {
2874
2875 my $cluster_conf = load_clusterfw_conf();
2876 my $cluster_options = $cluster_conf->{options};
2877
2878 my $enable = $cluster_options->{enable};
2879
2880 my $status = read_pvefw_status();
2881
2882 die "Firewall is disabled - cannot start\n" if !$enable && $start;
2883
2884 if (!$enable) {
2885 PVE::Firewall::remove_pvefw_chains();
2886 print "Firewall disabled\n" if $verbose;
2887 return;
2888 }
2889
2890 my $hostfw_conf = load_hostfw_conf();
2891
2892 my ($ruleset, $ipset_ruleset) = compile($cluster_conf, $hostfw_conf);
2893
2894 if ($start || $status eq 'active') {
2895
2896 save_pvefw_status('active') if ($status ne 'active');
2897
2898 apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $verbose);
2899 } else {
2900 print "Firewall not active (status = $status)\n" if $verbose;
2901 }
2902 };
2903
2904 run_locked($code);
2905 }
2906
2907
2908 1;
Firewall test scripts