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