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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 my $rule_properties = {
788 pos => {
789 description => "Update rule at position <pos>.",
790 type => 'integer',
791 minimum => 0,
792 optional => 1,
793 },
794 digest => get_standard_option('pve-config-digest'),
795 type => {
796 type => 'string',
797 optional => 1,
798 enum => ['in', 'out', 'group'],
799 },
800 action => {
801 description => "Rule action ('ACCEPT', 'DROP', 'REJECT') or security group name.",
802 type => 'string',
803 optional => 1,
804 pattern => $security_group_pattern,
805 maxLength => 20,
806 minLength => 2,
807 },
808 macro => {
809 type => 'string',
810 optional => 1,
811 maxLength => 128,
812 },
813 iface => get_standard_option('pve-iface', { optional => 1 }),
814 source => {
815 type => 'string', format => 'pve-fw-v4addr-spec',
816 optional => 1,
817 },
818 dest => {
819 type => 'string', format => 'pve-fw-v4addr-spec',
820 optional => 1,
821 },
822 proto => {
823 type => 'string', format => 'pve-fw-protocol-spec',
824 optional => 1,
825 },
826 enable => {
827 type => 'boolean',
828 optional => 1,
829 },
830 sport => {
831 type => 'string', format => 'pve-fw-port-spec',
832 optional => 1,
833 },
834 dport => {
835 type => 'string', format => 'pve-fw-port-spec',
836 optional => 1,
837 },
838 comment => {
839 type => 'string',
840 optional => 1,
841 },
842 };
843
844 sub cleanup_fw_rule {
845 my ($rule, $digest, $pos) = @_;
846
847 my $r = {};
848
849 foreach my $k (keys %$rule) {
850 next if !$rule_properties->{$k};
851 my $v = $rule->{$k};
852 next if !defined($v);
853 $r->{$k} = $v;
854 $r->{digest} = $digest;
855 $r->{pos} = $pos;
856 }
857
858 return $r;
859 }
860
861 sub add_rule_properties {
862 my ($properties) = @_;
863
864 foreach my $k (keys %$rule_properties) {
865 my $h = $rule_properties->{$k};
866 # copy data, so that we can modify later without side effects
867 foreach my $opt (keys %$h) { $properties->{$k}->{$opt} = $h->{$opt}; }
868 }
869
870 return $properties;
871 }
872
873 sub delete_rule_properties {
874 my ($rule, $delete_str) = @_;
875
876 foreach my $opt (PVE::Tools::split_list($delete_str)) {
877 raise_param_exc({ 'delete' => "no such property ('$opt')"})
878 if !defined($rule_properties->{$opt});
879 raise_param_exc({ 'delete' => "unable to delete required property '$opt'"})
880 if $opt eq 'type' || $opt eq 'action';
881 delete $rule->{$opt};
882 }
883
884 return $rule;
885 }
886
887 my $apply_macro = sub {
888 my ($macro_name, $param, $verify) = @_;
889
890 my $macro_rules = $pve_fw_parsed_macros->{$macro_name};
891 die "unknown macro '$macro_name'\n" if !$macro_rules; # should not happen
892
893 my $rules = [];
894
895 foreach my $templ (@$macro_rules) {
896 my $rule = {};
897 my $param_used = {};
898 foreach my $k (keys %$templ) {
899 my $v = $templ->{$k};
900 if ($v eq 'PARAM') {
901 $v = $param->{$k};
902 $param_used->{$k} = 1;
903 } elsif ($v eq 'DEST') {
904 $v = $param->{dest};
905 $param_used->{dest} = 1;
906 } elsif ($v eq 'SOURCE') {
907 $v = $param->{source};
908 $param_used->{source} = 1;
909 }
910
911 if (!defined($v)) {
912 my $msg = "missing parameter '$k' in macro '$macro_name'";
913 raise_param_exc({ macro => $msg }) if $verify;
914 die "$msg\n";
915 }
916 $rule->{$k} = $v;
917 }
918 foreach my $k (keys %$param) {
919 next if $k eq 'macro';
920 next if !defined($param->{$k});
921 next if $param_used->{$k};
922 if (defined($rule->{$k})) {
923 if ($rule->{$k} ne $param->{$k}) {
924 my $msg = "parameter '$k' already define in macro (value = '$rule->{$k}')";
925 raise_param_exc({ $k => $msg }) if $verify;
926 die "$msg\n";
927 }
928 } else {
929 $rule->{$k} = $param->{$k};
930 }
931 }
932 push @$rules, $rule;
933 }
934
935 return $rules;
936 };
937
938 sub verify_rule {
939 my ($rule, $allow_groups) = @_;
940
941 my $type = $rule->{type};
942
943 raise_param_exc({ type => "missing property"}) if !$type;
944 raise_param_exc({ action => "missing property"}) if !$rule->{action};
945
946 if ($type eq 'in' || $type eq 'out') {
947 raise_param_exc({ action => "unknown action '$rule->{action}'"})
948 if $rule->{action} !~ m/^(ACCEPT|DROP|REJECT)$/;
949 } elsif ($type eq 'group') {
950 raise_param_exc({ type => "security groups not allowed"})
951 if !$allow_groups;
952 raise_param_exc({ action => "invalid characters in security group name"})
953 if $rule->{action} !~ m/^${security_group_pattern}$/;
954 } else {
955 raise_param_exc({ type => "unknown rule type '$type'"});
956 }
957
958 # fixme: verify $rule->{iface}?
959
960 if ($rule->{macro}) {
961 my $preferred_name = $pve_fw_preferred_macro_names->{lc($rule->{macro})};
962 raise_param_exc({ macro => "unknown macro '$rule->{macro}'"}) if !$preferred_name;
963 $rule->{macro} = $preferred_name;
964 }
965
966 if ($rule->{dport}) {
967 eval { parse_port_name_number_or_range($rule->{dport}); };
968 raise_param_exc({ dport => $@ }) if $@;
969 }
970
971 if ($rule->{sport}) {
972 eval { parse_port_name_number_or_range($rule->{sport}); };
973 raise_param_exc({ sport => $@ }) if $@;
974 }
975
976 if ($rule->{source}) {
977 eval { parse_address_list($rule->{source}); };
978 raise_param_exc({ source => $@ }) if $@;
979 }
980
981 if ($rule->{dest}) {
982 eval { parse_address_list($rule->{dest}); };
983 raise_param_exc({ dest => $@ }) if $@;
984 }
985
986 if ($rule->{macro}) {
987 &$apply_macro($rule->{macro}, $rule, 1);
988 }
989
990 return $rule;
991 }
992
993 sub copy_rule_data {
994 my ($rule, $param) = @_;
995
996 foreach my $k (keys %$rule_properties) {
997 if (defined(my $v = $param->{$k})) {
998 if ($v eq '' || $v eq '-') {
999 delete $rule->{$k};
1000 } else {
1001 $rule->{$k} = $v;
1002 }
1003 } else {
1004 delete $rule->{$k};
1005 }
1006 }
1007
1008 # verify rule now
1009
1010 return $rule;
1011 }
1012
1013 # core functions
1014 my $bridge_firewall_enabled = 0;
1015
1016 sub enable_bridge_firewall {
1017
1018 return if $bridge_firewall_enabled; # only once
1019
1020 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
1021 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
1022
1023 # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
1024 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
1025
1026 $bridge_firewall_enabled = 1;
1027 }
1028
1029 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
1030
1031 sub iptables_restore_cmdlist {
1032 my ($cmdlist) = @_;
1033
1034 run_command("/sbin/iptables-restore -n", input => $cmdlist);
1035 }
1036
1037 sub ipset_restore_cmdlist {
1038 my ($cmdlist) = @_;
1039
1040 run_command("/usr/sbin/ipset restore", input => $cmdlist);
1041 }
1042
1043 sub iptables_get_chains {
1044
1045 my $res = {};
1046
1047 # check what chains we want to track
1048 my $is_pvefw_chain = sub {
1049 my $name = shift;
1050
1051 return 1 if $name =~ m/^PVEFW-\S+$/;
1052
1053 return 1 if $name =~ m/^tap\d+i\d+-(:?IN|OUT)$/;
1054
1055 return 1 if $name =~ m/^veth\d+.\d+-(:?IN|OUT)$/; # fixme: dev name is configurable
1056
1057 return 1 if $name =~ m/^venet0-\d+-(:?IN|OUT)$/;
1058
1059 return 1 if $name =~ m/^vmbr\d+-(:?FW|IN|OUT|IPS)$/;
1060 return 1 if $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/;
1061
1062 return undef;
1063 };
1064
1065 my $table = '';
1066
1067 my $hooks = {};
1068
1069 my $parser = sub {
1070 my $line = shift;
1071
1072 return if $line =~ m/^#/;
1073 return if $line =~ m/^\s*$/;
1074
1075 if ($line =~ m/^\*(\S+)$/) {
1076 $table = $1;
1077 return;
1078 }
1079
1080 return if $table ne 'filter';
1081
1082 if ($line =~ m/^:(\S+)\s/) {
1083 my $chain = $1;
1084 return if !&$is_pvefw_chain($chain);
1085 $res->{$chain} = "unknown";
1086 } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
1087 my ($chain, $sig) = ($1, $2);
1088 return if !&$is_pvefw_chain($chain);
1089 $res->{$chain} = $sig;
1090 } elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD)\s+-j\s+PVEFW-\1$/) {
1091 $hooks->{$1} = 1;
1092 } else {
1093 # simply ignore the rest
1094 return;
1095 }
1096 };
1097
1098 run_command("/sbin/iptables-save", outfunc => $parser);
1099
1100 return wantarray ? ($res, $hooks) : $res;
1101 }
1102
1103 sub iptables_chain_digest {
1104 my ($rules) = @_;
1105 my $digest = Digest::SHA->new('sha1');
1106 foreach my $rule (@$rules) { # order is important
1107 $digest->add($rule);
1108 }
1109 return $digest->b64digest;
1110 }
1111
1112 sub ipset_chain_digest {
1113 my ($rules) = @_;
1114
1115 my $digest = Digest::SHA->new('sha1');
1116 foreach my $rule (sort @$rules) { # note: sorted
1117 $digest->add($rule);
1118 }
1119 return $digest->b64digest;
1120 }
1121
1122 sub ipset_get_chains {
1123
1124 my $res = {};
1125 my $chains = {};
1126
1127 my $parser = sub {
1128 my $line = shift;
1129
1130 return if $line =~ m/^#/;
1131 return if $line =~ m/^\s*$/;
1132 if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
1133 my $chain = $1;
1134 $line =~ s/\s+$//; # delete trailing white space
1135 push @{$chains->{$chain}}, $line;
1136 } else {
1137 # simply ignore the rest
1138 return;
1139 }
1140 };
1141
1142 run_command("/usr/sbin/ipset save", outfunc => $parser);
1143
1144 # compute digest for each chain
1145 foreach my $chain (keys %$chains) {
1146 $res->{$chain} = ipset_chain_digest($chains->{$chain});
1147 }
1148
1149 return $res;
1150 }
1151
1152 sub ruleset_generate_cmdstr {
1153 my ($ruleset, $chain, $rule, $actions, $goto, $cluster_conf) = @_;
1154
1155 return if defined($rule->{enable}) && !$rule->{enable};
1156
1157 die "unable to emit macro - internal error" if $rule->{macro}; # should not happen
1158
1159 my $nbdport = defined($rule->{dport}) ? parse_port_name_number_or_range($rule->{dport}) : 0;
1160 my $nbsport = defined($rule->{sport}) ? parse_port_name_number_or_range($rule->{sport}) : 0;
1161
1162 my @cmd = ();
1163
1164 push @cmd, "-i $rule->{iface_in}" if $rule->{iface_in};
1165 push @cmd, "-o $rule->{iface_out}" if $rule->{iface_out};
1166
1167 my $source = $rule->{source};
1168 my $dest = $rule->{dest};
1169
1170 if ($source) {
1171 if ($source =~ m/^(\+)(\S+)$/) {
1172 die "no such ipset $2" if !$cluster_conf->{ipset}->{$2};
1173 push @cmd, "-m set --match-set PVEFW-$2 src";
1174
1175 } elsif ($source =~ m/\-/){
1176 push @cmd, "-m iprange --src-range $source";
1177
1178 } else {
1179 push @cmd, "-s $source";
1180 }
1181 }
1182
1183 if ($dest) {
1184 if ($dest =~ m/^(\+)(\S+)$/) {
1185 die "no such ipset $2" if !$cluster_conf->{ipset}->{$2};
1186 push @cmd, "-m set --match-set PVEFW-$2 dst";
1187
1188 } elsif ($dest =~ m/^(\d+)\.(\d+).(\d+).(\d+)\-(\d+)\.(\d+).(\d+).(\d+)$/){
1189 push @cmd, "-m iprange --dst-range $dest";
1190
1191 } else {
1192 push @cmd, "-s $dest";
1193 }
1194 }
1195
1196 if ($rule->{proto}) {
1197 push @cmd, "-p $rule->{proto}";
1198
1199 my $multiport = 0;
1200 $multiport++ if $nbdport > 1;
1201 $multiport++ if $nbsport > 1;
1202
1203 push @cmd, "--match multiport" if $multiport;
1204
1205 die "multiport: option '--sports' cannot be used together with '--dports'\n"
1206 if ($multiport == 2) && ($rule->{dport} ne $rule->{sport});
1207
1208 if ($rule->{dport}) {
1209 if ($rule->{proto} && $rule->{proto} eq 'icmp') {
1210 # Note: we use dport to store --icmp-type
1211 die "unknown icmp-type '$rule->{dport}'\n" if !defined($icmp_type_names->{$rule->{dport}});
1212 push @cmd, "-m icmp --icmp-type $rule->{dport}";
1213 } else {
1214 if ($nbdport > 1) {
1215 if ($multiport == 2) {
1216 push @cmd, "--ports $rule->{dport}";
1217 } else {
1218 push @cmd, "--dports $rule->{dport}";
1219 }
1220 } else {
1221 push @cmd, "--dport $rule->{dport}";
1222 }
1223 }
1224 }
1225
1226 if ($rule->{sport}) {
1227 if ($nbsport > 1) {
1228 push @cmd, "--sports $rule->{sport}" if $multiport != 2;
1229 } else {
1230 push @cmd, "--sport $rule->{sport}";
1231 }
1232 }
1233 } elsif ($rule->{dport} || $rule->{sport}) {
1234 warn "ignoring destination port '$rule->{dport}' - no protocol specified\n" if $rule->{dport};
1235 warn "ignoring source port '$rule->{sport}' - no protocol specified\n" if $rule->{sport};
1236 }
1237
1238 push @cmd, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
1239
1240 if (my $action = $rule->{action}) {
1241 $action = $actions->{$action} if defined($actions->{$action});
1242 $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
1243 push @cmd, $goto ? "-g $action" : "-j $action";
1244 }
1245
1246 return scalar(@cmd) ? join(' ', @cmd) : undef;
1247 }
1248
1249 sub ruleset_generate_rule {
1250 my ($ruleset, $chain, $rule, $actions, $goto, $cluster_conf) = @_;
1251
1252 my $rules;
1253
1254 if ($rule->{macro}) {
1255 $rules = &$apply_macro($rule->{macro}, $rule);
1256 } else {
1257 $rules = [ $rule ];
1258 }
1259
1260 foreach my $tmp (@$rules) {
1261 if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $tmp, $actions, $goto, $cluster_conf)) {
1262 ruleset_addrule($ruleset, $chain, $cmdstr);
1263 }
1264 }
1265 }
1266
1267 sub ruleset_generate_rule_insert {
1268 my ($ruleset, $chain, $rule, $actions, $goto) = @_;
1269
1270 die "implement me" if $rule->{macro}; # not implemented, because not needed so far
1271
1272 if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $rule, $actions, $goto)) {
1273 ruleset_insertrule($ruleset, $chain, $cmdstr);
1274 }
1275 }
1276
1277 sub ruleset_create_chain {
1278 my ($ruleset, $chain) = @_;
1279
1280 die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
1281 die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
1282
1283 die "chain '$chain' already exists\n" if $ruleset->{$chain};
1284
1285 $ruleset->{$chain} = [];
1286 }
1287
1288 sub ruleset_chain_exist {
1289 my ($ruleset, $chain) = @_;
1290
1291 return $ruleset->{$chain} ? 1 : undef;
1292 }
1293
1294 sub ruleset_addrule {
1295 my ($ruleset, $chain, $rule) = @_;
1296
1297 die "no such chain '$chain'\n" if !$ruleset->{$chain};
1298
1299 push @{$ruleset->{$chain}}, "-A $chain $rule";
1300 }
1301
1302 sub ruleset_insertrule {
1303 my ($ruleset, $chain, $rule) = @_;
1304
1305 die "no such chain '$chain'\n" if !$ruleset->{$chain};
1306
1307 unshift @{$ruleset->{$chain}}, "-A $chain $rule";
1308 }
1309
1310 sub get_log_rule_base {
1311 my ($chain, $vmid, $msg, $loglevel) = @_;
1312
1313 die "internal error - no log level" if !defined($loglevel);
1314
1315 $vmid = 0 if !defined($vmid);
1316
1317 # Note: we use special format for prefix to pass further
1318 # info to log daemon (VMID, LOGVELEL and CHAIN)
1319
1320 return "-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
1321 }
1322
1323 sub ruleset_addlog {
1324 my ($ruleset, $chain, $vmid, $msg, $loglevel, $rule) = @_;
1325
1326 return if !defined($loglevel);
1327
1328 my $logrule = get_log_rule_base($chain, $vmid, $msg, $loglevel);
1329
1330 $logrule = "$rule $logrule" if defined($rule);
1331
1332 ruleset_addrule($ruleset, $chain, $logrule)
1333 }
1334
1335 sub generate_bridge_chains {
1336 my ($ruleset, $hostfw_conf, $bridge, $routing_table) = @_;
1337
1338 my $options = $hostfw_conf->{options} || {};
1339
1340 die "error: detected direct route to bridge '$bridge'\n"
1341 if !$options->{allow_bridge_route} && $routing_table->{$bridge};
1342
1343 if (!ruleset_chain_exist($ruleset, "$bridge-FW")) {
1344 ruleset_create_chain($ruleset, "$bridge-FW");
1345 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -m physdev --physdev-is-out -j $bridge-FW");
1346 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -m physdev --physdev-is-in -j $bridge-FW");
1347 }
1348
1349 if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) {
1350 ruleset_create_chain($ruleset, "$bridge-OUT");
1351 ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-in -j $bridge-OUT");
1352 ruleset_insertrule($ruleset, "PVEFW-INPUT", "-i $bridge -m physdev --physdev-is-in -j $bridge-OUT");
1353 }
1354
1355 if (!ruleset_chain_exist($ruleset, "$bridge-IN")) {
1356 ruleset_create_chain($ruleset, "$bridge-IN");
1357 ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-out -j $bridge-IN");
1358 ruleset_addrule($ruleset, "$bridge-FW", "-m mark --mark 1 -j ACCEPT");
1359 # accept traffic to unmanaged bridge ports
1360 ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-out -j ACCEPT ");
1361 }
1362 }
1363
1364 sub ruleset_add_chain_policy {
1365 my ($ruleset, $chain, $vmid, $policy, $loglevel, $accept_action) = @_;
1366
1367 if ($policy eq 'ACCEPT') {
1368
1369 ruleset_generate_rule($ruleset, $chain, { action => 'ACCEPT' },
1370 { ACCEPT => $accept_action});
1371
1372 } elsif ($policy eq 'DROP') {
1373
1374 ruleset_addrule($ruleset, $chain, "-j PVEFW-Drop");
1375
1376 ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
1377
1378 ruleset_addrule($ruleset, $chain, "-j DROP");
1379 } elsif ($policy eq 'REJECT') {
1380 ruleset_addrule($ruleset, $chain, "-j PVEFW-Reject");
1381
1382 ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
1383
1384 ruleset_addrule($ruleset, $chain, "-g PVEFW-reject");
1385 } else {
1386 # should not happen
1387 die "internal error: unknown policy '$policy'";
1388 }
1389 }
1390
1391 sub ruleset_create_vm_chain {
1392 my ($ruleset, $chain, $options, $macaddr, $direction) = @_;
1393
1394 ruleset_create_chain($ruleset, $chain);
1395 my $accept = generate_nfqueue($options);
1396
1397 if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
1398 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
1399 }
1400
1401 if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
1402 if ($direction eq 'OUT') {
1403 ruleset_generate_rule($ruleset, $chain, { action => 'PVEFW-SET-ACCEPT-MARK',
1404 proto => 'udp', sport => 68, dport => 67 });
1405 } else {
1406 ruleset_generate_rule($ruleset, $chain, { action => 'ACCEPT',
1407 proto => 'udp', sport => 67, dport => 68 });
1408 }
1409 }
1410
1411 if ($options->{tcpflags}) {
1412 ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
1413 }
1414
1415 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1416 if ($direction eq 'OUT') {
1417 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -g PVEFW-SET-ACCEPT-MARK");
1418 } else {
1419 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j $accept");
1420 }
1421
1422 if ($direction eq 'OUT') {
1423 if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
1424 ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr -j DROP");
1425 }
1426 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1427 }
1428 }
1429
1430 sub ruleset_generate_vm_rules {
1431 my ($ruleset, $rules, $cluster_conf, $chain, $netid, $direction, $options) = @_;
1432
1433 my $lc_direction = lc($direction);
1434
1435 foreach my $rule (@$rules) {
1436 next if $rule->{iface} && $rule->{iface} ne $netid;
1437 next if !$rule->{enable};
1438 if ($rule->{type} eq 'group') {
1439 my $group_chain = "GROUP-$rule->{action}-$direction";
1440 if(!ruleset_chain_exist($ruleset, $group_chain)){
1441 generate_group_rules($ruleset, $cluster_conf, $rule->{action});
1442 }
1443 ruleset_addrule($ruleset, $chain, "-j $group_chain");
1444 if ($direction eq 'OUT'){
1445 ruleset_addrule($ruleset, $chain, "-m mark --mark 1 -j RETURN");
1446 }else{
1447 my $accept = generate_nfqueue($options);
1448 ruleset_addrule($ruleset, $chain, "-m mark --mark 1 -j $accept");
1449 }
1450
1451 } else {
1452 next if $rule->{type} ne $lc_direction;
1453 if ($direction eq 'OUT') {
1454 ruleset_generate_rule($ruleset, $chain, $rule,
1455 { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1456 } else {
1457 my $accept = generate_nfqueue($options);
1458 ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept , REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1459 }
1460 }
1461 }
1462 }
1463
1464 sub generate_nfqueue {
1465 my ($options) = @_;
1466
1467 my $action = "";
1468 if($options->{ips}){
1469 $action = "NFQUEUE";
1470 if($options->{ips_queues} && $options->{ips_queues} =~ m/^(\d+)(:(\d+))?$/) {
1471 if(defined($3) && defined($1)) {
1472 $action .= " --queue-balance $1:$3";
1473 }elsif (defined($1)) {
1474 $action .= " --queue-num $1";
1475 }
1476 }
1477 $action .= " --queue-bypass";
1478 }else{
1479 $action = "ACCEPT";
1480 }
1481
1482 return $action;
1483 }
1484
1485 sub ruleset_generate_vm_ipsrules {
1486 my ($ruleset, $options, $direction, $iface, $bridge) = @_;
1487
1488 if ($options->{ips} && $direction eq 'IN') {
1489 my $nfqueue = generate_nfqueue($options);
1490
1491 if (!ruleset_chain_exist($ruleset, "$bridge-IPS")) {
1492 ruleset_create_chain($ruleset, "PVEFW-IPS");
1493 }
1494
1495 if (!ruleset_chain_exist($ruleset, "$bridge-IPS")) {
1496 ruleset_create_chain($ruleset, "$bridge-IPS");
1497 ruleset_insertrule($ruleset, "PVEFW-IPS", "-o $bridge -m physdev --physdev-is-out -j $bridge-IPS");
1498 }
1499
1500 ruleset_addrule($ruleset, "$bridge-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged -j $nfqueue");
1501 }
1502 }
1503
1504 sub generate_venet_rules_direction {
1505 my ($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip, $direction) = @_;
1506
1507 parse_address_list($ip); # make sure we have a valid $ip list
1508
1509 my $lc_direction = lc($direction);
1510
1511 my $rules = $vmfw_conf->{rules};
1512
1513 my $options = $vmfw_conf->{options};
1514 my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
1515
1516 my $chain = "venet0-$vmid-$direction";
1517
1518 ruleset_create_vm_chain($ruleset, $chain, $options, undef, $direction);
1519
1520 ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $chain, 'venet', $direction);
1521
1522 # implement policy
1523 my $policy;
1524
1525 if ($direction eq 'OUT') {
1526 $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1527 } else {
1528 $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1529 }
1530
1531 my $accept = generate_nfqueue($options);
1532 my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
1533 ruleset_add_chain_policy($ruleset, $chain, $vmid, $policy, $loglevel, $accept_action);
1534
1535 # plug into FORWARD, INPUT and OUTPUT chain
1536 if ($direction eq 'OUT') {
1537 ruleset_generate_rule_insert($ruleset, "PVEFW-FORWARD", {
1538 action => $chain,
1539 source => $ip,
1540 iface_in => 'venet0'});
1541
1542 ruleset_generate_rule_insert($ruleset, "PVEFW-INPUT", {
1543 action => $chain,
1544 source => $ip,
1545 iface_in => 'venet0'});
1546 } else {
1547 ruleset_generate_rule($ruleset, "PVEFW-FORWARD", {
1548 action => $chain,
1549 dest => $ip,
1550 iface_out => 'venet0'});
1551
1552 ruleset_generate_rule($ruleset, "PVEFW-OUTPUT", {
1553 action => $chain,
1554 dest => $ip,
1555 iface_out => 'venet0'});
1556 }
1557 }
1558
1559 sub generate_tap_rules_direction {
1560 my ($ruleset, $cluster_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $bridge, $direction) = @_;
1561
1562 my $lc_direction = lc($direction);
1563
1564 my $rules = $vmfw_conf->{rules};
1565
1566 my $options = $vmfw_conf->{options};
1567 my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
1568
1569 my $tapchain = "$iface-$direction";
1570
1571 ruleset_create_vm_chain($ruleset, $tapchain, $options, $macaddr, $direction);
1572
1573 ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $tapchain, $netid, $direction, $options);
1574
1575 ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface, $bridge);
1576
1577 # implement policy
1578 my $policy;
1579
1580 if ($direction eq 'OUT') {
1581 $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1582 } else {
1583 $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1584 }
1585
1586 my $accept = generate_nfqueue($options);
1587 my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
1588 ruleset_add_chain_policy($ruleset, $tapchain, $vmid, $policy, $loglevel, $accept_action);
1589
1590 # plug the tap chain to bridge chain
1591 if ($direction eq 'IN') {
1592 ruleset_insertrule($ruleset, "$bridge-IN",
1593 "-m physdev --physdev-is-bridged --physdev-out $iface -j $tapchain");
1594 } else {
1595 ruleset_insertrule($ruleset, "$bridge-OUT",
1596 "-m physdev --physdev-in $iface -j $tapchain");
1597 }
1598 }
1599
1600 sub enable_host_firewall {
1601 my ($ruleset, $hostfw_conf, $cluster_conf) = @_;
1602
1603 # fixme: allow security groups
1604
1605 my $options = $hostfw_conf->{options};
1606 my $rules = $hostfw_conf->{rules};
1607
1608 # host inbound firewall
1609 my $chain = "PVEFW-HOST-IN";
1610 ruleset_create_chain($ruleset, $chain);
1611
1612 my $loglevel = get_option_log_level($options, "log_level_in");
1613
1614 if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
1615 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
1616 }
1617
1618 if ($options->{tcpflags}) {
1619 ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
1620 }
1621
1622 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1623 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
1624 ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
1625 ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
1626 ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW --dport 5404:5405 -j ACCEPT");
1627 ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
1628
1629 # we use RETURN because we need to check also tap rules
1630 my $accept_action = 'RETURN';
1631
1632 foreach my $rule (@$rules) {
1633 next if $rule->{type} ne 'in';
1634 ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1635 }
1636
1637 # implement input policy
1638 my $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1639 ruleset_add_chain_policy($ruleset, $chain, 0, $policy, $loglevel, $accept_action);
1640
1641 # host outbound firewall
1642 $chain = "PVEFW-HOST-OUT";
1643 ruleset_create_chain($ruleset, $chain);
1644
1645 $loglevel = get_option_log_level($options, "log_level_out");
1646
1647 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1648 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
1649 ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
1650 ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
1651 ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW --dport 5404:5405 -j ACCEPT");
1652 ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
1653
1654 # we use RETURN because we may want to check other thigs later
1655 $accept_action = 'RETURN';
1656
1657 foreach my $rule (@$rules) {
1658 next if $rule->{type} ne 'out';
1659 ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1660 }
1661
1662 # implement output policy
1663 $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1664 ruleset_add_chain_policy($ruleset, $chain, 0, $policy, $loglevel, $accept_action);
1665
1666 ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
1667 ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
1668 }
1669
1670 sub generate_group_rules {
1671 my ($ruleset, $cluster_conf, $group) = @_;
1672 die "no such security group '$group'\n" if !$cluster_conf->{groups}->{$group};
1673
1674 my $rules = $cluster_conf->{groups}->{$group};
1675
1676 my $chain = "GROUP-${group}-IN";
1677
1678 ruleset_create_chain($ruleset, $chain);
1679 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1680
1681 foreach my $rule (@$rules) {
1682 next if $rule->{type} ne 'in';
1683 ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1684 }
1685
1686 $chain = "GROUP-${group}-OUT";
1687
1688 ruleset_create_chain($ruleset, $chain);
1689 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1690
1691 foreach my $rule (@$rules) {
1692 next if $rule->{type} ne 'out';
1693 # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
1694 # check also other tap rules later
1695 ruleset_generate_rule($ruleset, $chain, $rule,
1696 { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1697 }
1698 }
1699
1700 my $MAX_NETS = 32;
1701 my $valid_netdev_names = {};
1702 for (my $i = 0; $i < $MAX_NETS; $i++) {
1703 $valid_netdev_names->{"net$i"} = 1;
1704 }
1705
1706 sub parse_fw_rule {
1707 my ($line, $need_iface, $allow_groups) = @_;
1708
1709 my ($type, $action, $iface, $source, $dest, $proto, $dport, $sport);
1710
1711 # we can add single line comments to the end of the rule
1712 my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
1713
1714 # we can disable a rule when prefixed with '|'
1715 my $enable = 1;
1716
1717 $enable = 0 if $line =~ s/^\|//;
1718
1719 my @data = split(/\s+/, $line);
1720 my $expected_elements = $need_iface ? 8 : 7;
1721
1722 die "wrong number of rule elements\n" if scalar(@data) > $expected_elements;
1723
1724 if ($need_iface) {
1725 ($type, $action, $iface, $source, $dest, $proto, $dport, $sport) = @data
1726 } else {
1727 ($type, $action, $source, $dest, $proto, $dport, $sport) = @data;
1728 }
1729
1730 die "incomplete rule\n" if ! ($type && $action);
1731
1732 my $macro;
1733
1734 $type = lc($type);
1735
1736 if ($type eq 'in' || $type eq 'out') {
1737 if ($action =~ m/^(ACCEPT|DROP|REJECT)$/) {
1738 # OK
1739 } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
1740 $action = $2;
1741 my $preferred_name = $pve_fw_preferred_macro_names->{lc($1)};
1742 die "unknown macro '$1'\n" if !$preferred_name;
1743 $macro = $preferred_name;
1744 } else {
1745 die "unknown action '$action'\n";
1746 }
1747 } elsif ($type eq 'group') {
1748 die "wrong number of rule elements\n" if scalar(@data) != 3;
1749 die "groups disabled\n" if !$allow_groups;
1750
1751 die "invalid characters in group name\n" if $action !~ m/^${security_group_pattern}$/;
1752 } else {
1753 die "unknown rule type '$type'\n";
1754 }
1755
1756 if ($need_iface) {
1757 $iface = undef if $iface && $iface eq '-';
1758 }
1759
1760 $proto = undef if $proto && $proto eq '-';
1761 pve_fw_verify_protocol_spec($proto) if $proto;
1762
1763 $source = undef if $source && $source eq '-';
1764 $dest = undef if $dest && $dest eq '-';
1765
1766 $dport = undef if $dport && $dport eq '-';
1767 $sport = undef if $sport && $sport eq '-';
1768
1769 parse_port_name_number_or_range($dport) if defined($dport);
1770 parse_port_name_number_or_range($sport) if defined($sport);
1771
1772 parse_address_list($source) if $source;
1773 parse_address_list($dest) if $dest;
1774
1775 return {
1776 type => $type,
1777 enable => $enable,
1778 comment => $comment,
1779 action => $action,
1780 macro => $macro,
1781 iface => $iface,
1782 source => $source,
1783 dest => $dest,
1784 proto => $proto,
1785 dport => $dport,
1786 sport => $sport,
1787 };
1788 }
1789
1790 sub parse_vmfw_option {
1791 my ($line) = @_;
1792
1793 my ($opt, $value);
1794
1795 my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1796
1797 if ($line =~ m/^(enable|dhcp|macfilter|nosmurfs|tcpflags|ips):\s*(0|1)\s*$/i) {
1798 $opt = lc($1);
1799 $value = int($2);
1800 } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
1801 $opt = lc($1);
1802 $value = $2 ? lc($3) : '';
1803 } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1804 $opt = lc($1);
1805 $value = uc($3);
1806 } elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
1807 $opt = lc($1);
1808 $value = $2;
1809 } else {
1810 chomp $line;
1811 die "can't parse option '$line'\n"
1812 }
1813
1814 return ($opt, $value);
1815 }
1816
1817 sub parse_hostfw_option {
1818 my ($line) = @_;
1819
1820 my ($opt, $value);
1821
1822 my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1823
1824 if ($line =~ m/^(enable|dhcp|nosmurfs|tcpflags|allow_bridge_route|optimize):\s*(0|1)\s*$/i) {
1825 $opt = lc($1);
1826 $value = int($2);
1827 } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
1828 $opt = lc($1);
1829 $value = $2 ? lc($3) : '';
1830 } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1831 $opt = lc($1);
1832 $value = uc($3);
1833 } elsif ($line =~ m/^(nf_conntrack_max):\s*(\d+)\s*$/i) {
1834 $opt = lc($1);
1835 $value = int($2);
1836 } else {
1837 chomp $line;
1838 die "can't parse option '$line'\n"
1839 }
1840
1841 return ($opt, $value);
1842 }
1843
1844 sub parse_clusterfw_option {
1845 my ($line) = @_;
1846
1847 my ($opt, $value);
1848
1849 if ($line =~ m/^(enable):\s*(0|1)\s*$/i) {
1850 $opt = lc($1);
1851 $value = int($2);
1852 } else {
1853 chomp $line;
1854 die "can't parse option '$line'\n"
1855 }
1856
1857 return ($opt, $value);
1858 }
1859
1860 sub parse_vm_fw_rules {
1861 my ($filename, $fh) = @_;
1862
1863 my $res = { rules => [], options => {}};
1864
1865 my $section;
1866
1867 my $digest = Digest::SHA->new('sha1');
1868
1869 while (defined(my $line = <$fh>)) {
1870 $digest->add($line);
1871
1872 next if $line =~ m/^#/;
1873 next if $line =~ m/^\s*$/;
1874
1875 my $linenr = $fh->input_line_number();
1876 my $prefix = "$filename (line $linenr)";
1877
1878 if ($line =~ m/^\[(\S+)\]\s*$/i) {
1879 $section = lc($1);
1880 warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1881 next;
1882 }
1883 if (!$section) {
1884 warn "$prefix: skip line - no section";
1885 next;
1886 }
1887
1888 next if !$res->{$section}; # skip undefined section
1889
1890 if ($section eq 'options') {
1891 eval {
1892 my ($opt, $value) = parse_vmfw_option($line);
1893 $res->{options}->{$opt} = $value;
1894 };
1895 warn "$prefix: $@" if $@;
1896 next;
1897 }
1898
1899 my $rule;
1900 eval { $rule = parse_fw_rule($line, 1, 1); };
1901 if (my $err = $@) {
1902 warn "$prefix: $err";
1903 next;
1904 }
1905
1906 push @{$res->{$section}}, $rule;
1907 }
1908
1909 $res->{digest} = $digest->b64digest;
1910
1911 return $res;
1912 }
1913
1914 sub parse_host_fw_rules {
1915 my ($filename, $fh) = @_;
1916
1917 my $res = { rules => [], options => {}};
1918
1919 my $section;
1920
1921 my $digest = Digest::SHA->new('sha1');
1922
1923 while (defined(my $line = <$fh>)) {
1924 $digest->add($line);
1925
1926 next if $line =~ m/^#/;
1927 next if $line =~ m/^\s*$/;
1928
1929 my $linenr = $fh->input_line_number();
1930 my $prefix = "$filename (line $linenr)";
1931
1932 if ($line =~ m/^\[(\S+)\]\s*$/i) {
1933 $section = lc($1);
1934 warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1935 next;
1936 }
1937 if (!$section) {
1938 warn "$prefix: skip line - no section";
1939 next;
1940 }
1941
1942 next if !$res->{$section}; # skip undefined section
1943
1944 if ($section eq 'options') {
1945 eval {
1946 my ($opt, $value) = parse_hostfw_option($line);
1947 $res->{options}->{$opt} = $value;
1948 };
1949 warn "$prefix: $@" if $@;
1950 next;
1951 }
1952
1953 my $rule;
1954 eval { $rule = parse_fw_rule($line, 1, 1); };
1955 if (my $err = $@) {
1956 warn "$prefix: $err";
1957 next;
1958 }
1959
1960 push @{$res->{$section}}, $rule;
1961 }
1962
1963 $res->{digest} = $digest->b64digest;
1964
1965 return $res;
1966 }
1967
1968 sub parse_cluster_fw_rules {
1969 my ($filename, $fh) = @_;
1970
1971 my $section;
1972 my $group;
1973
1974 my $res = {
1975 rules => [],
1976 options => {},
1977 groups => {},
1978 group_comments => {},
1979 ipset => {} ,
1980 ipset_comments => {},
1981 };
1982
1983 my $digest = Digest::SHA->new('sha1');
1984
1985 while (defined(my $line = <$fh>)) {
1986 $digest->add($line);
1987
1988 next if $line =~ m/^#/;
1989 next if $line =~ m/^\s*$/;
1990
1991 my $linenr = $fh->input_line_number();
1992 my $prefix = "$filename (line $linenr)";
1993
1994 if ($line =~ m/^\[options\]$/i) {
1995 $section = 'options';
1996 next;
1997 }
1998
1999 if ($line =~ m/^\[group\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i) {
2000 $section = 'groups';
2001 $group = lc($1);
2002 my $comment = $2;
2003 $res->{$section}->{$group} = [];
2004 $res->{group_comments}->{$group} = $comment if $comment;
2005 next;
2006 }
2007
2008 if ($line =~ m/^\[rules\]$/i) {
2009 $section = 'rules';
2010 next;
2011 }
2012
2013 if ($line =~ m/^\[ipset\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i) {
2014 $section = 'ipset';
2015 $group = lc($1);
2016 my $comment = $2;
2017 $res->{$section}->{$group} = [];
2018 $res->{ipset_comments}->{$group} = $comment if $comment;
2019 next;
2020 }
2021
2022 if (!$section) {
2023 warn "$prefix: skip line - no section\n";
2024 next;
2025 }
2026
2027 if ($section eq 'options') {
2028 eval {
2029 my ($opt, $value) = parse_clusterfw_option($line);
2030 $res->{options}->{$opt} = $value;
2031 };
2032 warn "$prefix: $@" if $@;
2033 } elsif ($section eq 'rules') {
2034 my $rule;
2035 eval { $rule = parse_fw_rule($line, 1, 1); };
2036 if (my $err = $@) {
2037 warn "$prefix: $err";
2038 next;
2039 }
2040 push @{$res->{$section}}, $rule;
2041 } elsif ($section eq 'groups') {
2042 my $rule;
2043 eval { $rule = parse_fw_rule($line, 0, 0); };
2044 if (my $err = $@) {
2045 warn "$prefix: $err";
2046 next;
2047 }
2048 push @{$res->{$section}->{$group}}, $rule;
2049 } elsif ($section eq 'ipset') {
2050 # we can add single line comments to the end of the rule
2051 my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
2052
2053 $line =~ m/^(\!)?\s*(\S+)\s*$/;
2054 my $nomatch = $1;
2055 my $cidr = $2;
2056
2057 $cidr =~ s|/32$||;
2058
2059 eval { pve_verify_ipv4_or_cidr($cidr); };
2060 if (my $err = $@) {
2061 warn "$prefix: $cidr - $err";
2062 next;
2063 }
2064
2065 my $entry = { cidr => $cidr };
2066 $entry->{nomatch} = 1 if $nomatch;
2067 $entry->{comment} = $comment if $comment;
2068
2069 push @{$res->{$section}->{$group}}, $entry;
2070 }
2071 }
2072
2073 $res->{digest} = $digest->b64digest;
2074 return $res;
2075 }
2076
2077 sub run_locked {
2078 my ($code, @param) = @_;
2079
2080 my $timeout = 10;
2081
2082 my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
2083
2084 die $@ if $@;
2085
2086 return $res;
2087 }
2088
2089 sub read_local_vm_config {
2090
2091 my $openvz = {};
2092 my $qemu = {};
2093
2094 my $vmdata = { openvz => $openvz, qemu => $qemu };
2095
2096 my $vmlist = PVE::Cluster::get_vmlist();
2097 return $vmdata if !$vmlist || !$vmlist->{ids};
2098 my $ids = $vmlist->{ids};
2099
2100 foreach my $vmid (keys %$ids) {
2101 next if !$vmid; # skip VE0
2102 my $d = $ids->{$vmid};
2103 next if !$d->{node} || $d->{node} ne $nodename;
2104 next if !$d->{type};
2105 if ($d->{type} eq 'openvz') {
2106 if ($have_pve_manager) {
2107 my $cfspath = PVE::OpenVZ::cfs_config_path($vmid);
2108 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2109 $openvz->{$vmid} = $conf;
2110 }
2111 }
2112 } elsif ($d->{type} eq 'qemu') {
2113 if ($have_qemu_server) {
2114 my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
2115 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2116 $qemu->{$vmid} = $conf;
2117 }
2118 }
2119 }
2120 }
2121
2122 return $vmdata;
2123 };
2124
2125 sub load_vmfw_conf {
2126 my ($vmid) = @_;
2127
2128 my $vmfw_conf = {};
2129
2130 my $filename = "/etc/pve/firewall/$vmid.fw";
2131 if (my $fh = IO::File->new($filename, O_RDONLY)) {
2132 $vmfw_conf = parse_vm_fw_rules($filename, $fh);
2133 }
2134
2135 return $vmfw_conf;
2136 }
2137
2138 my $format_rules = sub {
2139 my ($rules, $need_iface) = @_;
2140
2141 my $raw = '';
2142
2143 foreach my $rule (@$rules) {
2144 if ($rule->{type} eq 'in' || $rule->{type} eq 'out' || $rule->{type} eq 'group') {
2145 $raw .= '|' if defined($rule->{enable}) && !$rule->{enable};
2146 $raw .= uc($rule->{type});
2147 if ($rule->{macro}) {
2148 $raw .= " $rule->{macro}($rule->{action})";
2149 } else {
2150 $raw .= " " . $rule->{action};
2151 }
2152 $raw .= " " . ($rule->{iface} || '-') if $need_iface;
2153
2154 if ($rule->{type} ne 'group') {
2155 $raw .= " " . ($rule->{source} || '-');
2156 $raw .= " " . ($rule->{dest} || '-');
2157 $raw .= " " . ($rule->{proto} || '-');
2158 $raw .= " " . ($rule->{dport} || '-');
2159 $raw .= " " . ($rule->{sport} || '-');
2160 }
2161
2162 $raw .= " # " . encode('utf8', $rule->{comment})
2163 if $rule->{comment} && $rule->{comment} !~ m/^\s*$/;
2164 $raw .= "\n";
2165 } else {
2166 die "unknown rule type '$rule->{type}'";
2167 }
2168 }
2169
2170 return $raw;
2171 };
2172
2173 my $format_options = sub {
2174 my ($options) = @_;
2175
2176 my $raw = '';
2177
2178 $raw .= "[OPTIONS]\n\n";
2179 foreach my $opt (keys %$options) {
2180 $raw .= "$opt: $options->{$opt}\n";
2181 }
2182 $raw .= "\n";
2183
2184 return $raw;
2185 };
2186
2187 my $format_ipset = sub {
2188 my ($options) = @_;
2189
2190 my $raw = '';
2191
2192 my $nethash = {};
2193 foreach my $entry (@$options) {
2194 $nethash->{$entry->{cidr}} = $entry;
2195 }
2196
2197 foreach my $cidr (sort keys %$nethash) {
2198 my $entry = $nethash->{$cidr};
2199 my $line = $entry->{nomatch} ? '!' : '';
2200 $line .= $entry->{cidr};
2201 $line .= " # " . encode('utf8', $entry->{comment})
2202 if $entry->{comment} && $entry->{comment} !~ m/^\s*$/;
2203 $raw .= "$line\n";
2204 }
2205
2206 return $raw;
2207 };
2208
2209 sub save_vmfw_conf {
2210 my ($vmid, $vmfw_conf) = @_;
2211
2212 my $raw = '';
2213
2214 my $options = $vmfw_conf->{options};
2215 $raw .= &$format_options($options) if scalar(keys %$options);
2216
2217 my $rules = $vmfw_conf->{rules};
2218 if (scalar(@$rules)) {
2219 $raw .= "[RULES]\n\n";
2220 $raw .= &$format_rules($rules, 1);
2221 $raw .= "\n";
2222 }
2223
2224 my $filename = "/etc/pve/firewall/$vmid.fw";
2225 PVE::Tools::file_set_contents($filename, $raw);
2226 }
2227
2228 sub read_vm_firewall_configs {
2229 my ($vmdata) = @_;
2230 my $vmfw_configs = {};
2231
2232 foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
2233 my $vmfw_conf = load_vmfw_conf($vmid);
2234 next if !$vmfw_conf->{options}; # skip if file does not exists
2235 $vmfw_configs->{$vmid} = $vmfw_conf;
2236 }
2237
2238 return $vmfw_configs;
2239 }
2240
2241 sub get_option_log_level {
2242 my ($options, $k) = @_;
2243
2244 my $v = $options->{$k};
2245 $v = $default_log_level if !defined($v);
2246
2247 return undef if $v eq '' || $v eq 'nolog';
2248
2249 $v = $log_level_hash->{$v} if defined($log_level_hash->{$v});
2250
2251 return $v if ($v >= 0) && ($v <= 7);
2252
2253 warn "unknown log level ($k = '$v')\n";
2254
2255 return undef;
2256 }
2257
2258 sub generate_std_chains {
2259 my ($ruleset, $options) = @_;
2260
2261 my $loglevel = get_option_log_level($options, 'smurf_log_level');
2262
2263 # same as shorewall smurflog.
2264 my $chain = 'PVEFW-smurflog';
2265
2266 push @{$pve_std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
2267 push @{$pve_std_chains->{$chain}}, "-j DROP";
2268
2269 # same as shorewall logflags action.
2270 $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
2271 $chain = 'PVEFW-logflags';
2272 # fixme: is this correctly logged by pvewf-logger? (ther is no --log-ip-options for NFLOG)
2273 push @{$pve_std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
2274 push @{$pve_std_chains->{$chain}}, "-j DROP";
2275
2276 foreach my $chain (keys %$pve_std_chains) {
2277 ruleset_create_chain($ruleset, $chain);
2278 foreach my $rule (@{$pve_std_chains->{$chain}}) {
2279 if (ref($rule)) {
2280 ruleset_generate_rule($ruleset, $chain, $rule);
2281 } else {
2282 ruleset_addrule($ruleset, $chain, $rule);
2283 }
2284 }
2285 }
2286 }
2287
2288 sub generate_ipset_chains {
2289 my ($ipset_ruleset, $fw_conf) = @_;
2290
2291 foreach my $ipset (keys %{$fw_conf->{ipset}}) {
2292 generate_ipset($ipset_ruleset, "PVEFW-$ipset", $fw_conf->{ipset}->{$ipset});
2293 }
2294 }
2295
2296 sub generate_ipset {
2297 my ($ipset_ruleset, $name, $options) = @_;
2298
2299 my $hashsize = scalar(@$options);
2300 if ($hashsize <= 64) {
2301 $hashsize = 64;
2302 } else {
2303 $hashsize = round_powerof2($hashsize);
2304 }
2305
2306 push @{$ipset_ruleset->{$name}}, "create $name hash:net family inet hashsize $hashsize maxelem $hashsize";
2307
2308 # remove duplicates
2309 my $nethash = {};
2310 foreach my $entry (@$options) {
2311 $nethash->{$entry->{cidr}} = $entry;
2312 }
2313
2314 foreach my $cidr (sort keys %$nethash) {
2315 my $entry = $nethash->{$cidr};
2316
2317 my $cmd = "add $name $cidr";
2318 if ($entry->{nomatch}) {
2319 if ($feature_ipset_nomatch) {
2320 push @{$ipset_ruleset->{$name}}, "$cmd nomatch";
2321 } else {
2322 warn "ignore !$cidr - nomatch not supported by kernel\n";
2323 }
2324 } else {
2325 push @{$ipset_ruleset->{$name}}, $cmd;
2326 }
2327 }
2328 }
2329
2330 sub round_powerof2 {
2331 my ($int) = @_;
2332
2333 $int--;
2334 $int |= $int >> $_ foreach (1,2,4,8,16);
2335 return ++$int;
2336 }
2337
2338 sub save_pvefw_status {
2339 my ($status) = @_;
2340
2341 die "unknown status '$status' - internal error"
2342 if $status !~ m/^(stopped|active)$/;
2343
2344 mkdir dirname($pve_fw_status_filename);
2345 PVE::Tools::file_set_contents($pve_fw_status_filename, $status);
2346 }
2347
2348 sub read_pvefw_status {
2349
2350 my $status = 'unknown';
2351
2352 return 'stopped' if ! -f $pve_fw_status_filename;
2353
2354 eval {
2355 $status = PVE::Tools::file_get_contents($pve_fw_status_filename);
2356 };
2357 warn $@ if $@;
2358
2359 return $status;
2360 }
2361
2362 # fixme: move to pve-common PVE::ProcFSTools
2363 sub read_proc_net_route {
2364 my $filename = "/proc/net/route";
2365
2366 my $res = {};
2367
2368 my $fh = IO::File->new ($filename, "r");
2369 return $res if !$fh;
2370
2371 my $int_to_quad = sub {
2372 return join '.' => map { ($_[0] >> 8*(3-$_)) % 256 } (3, 2, 1, 0);
2373 };
2374
2375 while (defined(my $line = <$fh>)) {
2376 next if $line =~/^Iface\s+Destination/; # skip head
2377 my ($iface, $dest, $gateway, $metric, $mask, $mtu) = (split(/\s+/, $line))[0,1,2,6,7,8];
2378 push @{$res->{$iface}}, {
2379 dest => &$int_to_quad(hex($dest)),
2380 gateway => &$int_to_quad(hex($gateway)),
2381 mask => &$int_to_quad(hex($mask)),
2382 metric => $metric,
2383 mtu => $mtu,
2384 };
2385 }
2386
2387 return $res;
2388 }
2389
2390 sub load_clusterfw_conf {
2391
2392 my $cluster_conf = {};
2393 if (my $fh = IO::File->new($clusterfw_conf_filename, O_RDONLY)) {
2394 $cluster_conf = parse_cluster_fw_rules($clusterfw_conf_filename, $fh);
2395 }
2396
2397 return $cluster_conf;
2398 }
2399
2400 sub save_clusterfw_conf {
2401 my ($cluster_conf) = @_;
2402
2403 my $raw = '';
2404
2405 my $options = $cluster_conf->{options};
2406 $raw .= &$format_options($options) if scalar(keys %$options);
2407
2408 foreach my $ipset (sort keys %{$cluster_conf->{ipset}}) {
2409 if (my $comment = $cluster_conf->{ipset_comments}->{$ipset}) {
2410 $raw .= "[IPSET $ipset] # $comment\n\n";
2411 } else {
2412 $raw .= "[IPSET $ipset]\n\n";
2413 }
2414 my $options = $cluster_conf->{ipset}->{$ipset};
2415 $raw .= &$format_ipset($options);
2416 $raw .= "\n";
2417 }
2418
2419 my $rules = $cluster_conf->{rules};
2420 if (scalar(@$rules)) {
2421 $raw .= "[RULES]\n\n";
2422 $raw .= &$format_rules($rules, 1);
2423 $raw .= "\n";
2424 }
2425
2426 foreach my $group (sort keys %{$cluster_conf->{groups}}) {
2427 my $rules = $cluster_conf->{groups}->{$group};
2428 if (my $comment = $cluster_conf->{group_comments}->{$group}) {
2429 $raw .= "[group $group] # $comment\n\n";
2430 } else {
2431 $raw .= "[group $group]\n\n";
2432 }
2433
2434 $raw .= &$format_rules($rules, 0);
2435 $raw .= "\n";
2436 }
2437
2438 PVE::Tools::file_set_contents($clusterfw_conf_filename, $raw);
2439 }
2440
2441 sub load_hostfw_conf {
2442
2443 my $hostfw_conf = {};
2444 if (my $fh = IO::File->new($hostfw_conf_filename, O_RDONLY)) {
2445 $hostfw_conf = parse_host_fw_rules($hostfw_conf_filename, $fh);
2446 }
2447 return $hostfw_conf;
2448 }
2449
2450 sub save_hostfw_conf {
2451 my ($hostfw_conf) = @_;
2452
2453 my $raw = '';
2454
2455 my $options = $hostfw_conf->{options};
2456 $raw .= &$format_options($options) if scalar(keys %$options);
2457
2458 my $rules = $hostfw_conf->{rules};
2459 if (scalar(@$rules)) {
2460 $raw .= "[RULES]\n\n";
2461 $raw .= &$format_rules($rules, 1);
2462 $raw .= "\n";
2463 }
2464
2465 PVE::Tools::file_set_contents($hostfw_conf_filename, $raw);
2466 }
2467
2468 sub compile {
2469 my $vmdata = read_local_vm_config();
2470 my $vmfw_configs = read_vm_firewall_configs($vmdata);
2471
2472 my $routing_table = read_proc_net_route();
2473
2474 my $cluster_conf = load_clusterfw_conf();
2475
2476 my $ipset_ruleset = {};
2477 generate_ipset_chains($ipset_ruleset, $cluster_conf);
2478
2479 my $ruleset = {};
2480
2481 ruleset_create_chain($ruleset, "PVEFW-INPUT");
2482 ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
2483
2484 ruleset_create_chain($ruleset, "PVEFW-FORWARD");
2485
2486 my $hostfw_conf = load_hostfw_conf();
2487 my $hostfw_options = $hostfw_conf->{options} || {};
2488
2489 generate_std_chains($ruleset, $hostfw_options);
2490
2491 my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
2492
2493 enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf) if $hostfw_enable;
2494
2495 # generate firewall rules for QEMU VMs
2496 foreach my $vmid (keys %{$vmdata->{qemu}}) {
2497 my $conf = $vmdata->{qemu}->{$vmid};
2498 my $vmfw_conf = $vmfw_configs->{$vmid};
2499 next if !$vmfw_conf;
2500 next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
2501
2502 foreach my $netid (keys %$conf) {
2503 next if $netid !~ m/^net(\d+)$/;
2504 my $net = PVE::QemuServer::parse_net($conf->{$netid});
2505 next if !$net;
2506 my $iface = "tap${vmid}i$1";
2507
2508 my $bridge = $net->{bridge};
2509 next if !$bridge; # fixme: ?
2510
2511 $bridge .= "v$net->{tag}" if $net->{tag};
2512
2513 generate_bridge_chains($ruleset, $hostfw_conf, $bridge, $routing_table);
2514
2515 my $macaddr = $net->{macaddr};
2516 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
2517 $vmfw_conf, $vmid, $bridge, 'IN');
2518 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
2519 $vmfw_conf, $vmid, $bridge, 'OUT');
2520 }
2521 }
2522
2523 # generate firewall rules for OpenVZ containers
2524 foreach my $vmid (keys %{$vmdata->{openvz}}) {
2525 my $conf = $vmdata->{openvz}->{$vmid};
2526
2527 my $vmfw_conf = $vmfw_configs->{$vmid};
2528 next if !$vmfw_conf;
2529 next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
2530
2531 if ($conf->{ip_address} && $conf->{ip_address}->{value}) {
2532 my $ip = $conf->{ip_address}->{value};
2533 generate_venet_rules_direction($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip, 'IN');
2534 generate_venet_rules_direction($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip, 'OUT');
2535 }
2536
2537 if ($conf->{netif} && $conf->{netif}->{value}) {
2538 my $netif = PVE::OpenVZ::parse_netif($conf->{netif}->{value});
2539 foreach my $netid (keys %$netif) {
2540 my $d = $netif->{$netid};
2541 my $bridge = $d->{bridge};
2542 if (!$bridge) {
2543 warn "no bridge device for CT $vmid iface '$netid'\n";
2544 next; # fixme?
2545 }
2546
2547 generate_bridge_chains($ruleset, $hostfw_conf, $bridge, $routing_table);
2548
2549 my $macaddr = $d->{mac};
2550 my $iface = $d->{host_ifname};
2551 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
2552 $vmfw_conf, $vmid, $bridge, 'IN');
2553 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
2554 $vmfw_conf, $vmid, $bridge, 'OUT');
2555 }
2556 }
2557 }
2558
2559 if($hostfw_options->{optimize}){
2560
2561 my $accept = ruleset_chain_exist($ruleset, "PVEFW-IPS") ? "PVEFW-IPS" : "ACCEPT";
2562 ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j $accept");
2563 ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate INVALID -j DROP");
2564 }
2565
2566 # fixme: what log level should we use here?
2567 my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
2568
2569 # fixme: should we really block inter-bridge traffic?
2570
2571 # always allow traffic from containers?
2572 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i venet0 -j RETURN");
2573
2574 # disable interbridge routing
2575 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o vmbr+ -j PVEFW-Drop");
2576 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i vmbr+ -j PVEFW-Drop");
2577 ruleset_addlog($ruleset, "PVEFW-FORWARD", 0, "DROP: ", $loglevel, "-o vmbr+");
2578 ruleset_addlog($ruleset, "PVEFW-FORWARD", 0, "DROP: ", $loglevel, "-i vmbr+");
2579 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o vmbr+ -j DROP");
2580 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i vmbr+ -j DROP");
2581
2582 return wantarray ? ($ruleset, $hostfw_conf, $ipset_ruleset) : $ruleset;
2583 }
2584
2585 sub get_ruleset_status {
2586 my ($ruleset, $active_chains, $digest_fn, $verbose) = @_;
2587
2588 my $statushash = {};
2589
2590 foreach my $chain (sort keys %$ruleset) {
2591 my $sig = &$digest_fn($ruleset->{$chain});
2592
2593 $statushash->{$chain}->{sig} = $sig;
2594
2595 my $oldsig = $active_chains->{$chain};
2596 if (!defined($oldsig)) {
2597 $statushash->{$chain}->{action} = 'create';
2598 } else {
2599 if ($oldsig eq $sig) {
2600 $statushash->{$chain}->{action} = 'exists';
2601 } else {
2602 $statushash->{$chain}->{action} = 'update';
2603 }
2604 }
2605 print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
2606 foreach my $cmd (@{$ruleset->{$chain}}) {
2607 print "\t$cmd\n" if $verbose;
2608 }
2609 }
2610
2611 foreach my $chain (sort keys %$active_chains) {
2612 if (!defined($ruleset->{$chain})) {
2613 my $sig = $active_chains->{$chain};
2614 $statushash->{$chain}->{action} = 'delete';
2615 $statushash->{$chain}->{sig} = $sig;
2616 print "delete $chain ($sig)\n" if $verbose;
2617 }
2618 }
2619
2620 return $statushash;
2621 }
2622
2623 sub print_sig_rule {
2624 my ($chain, $sig) = @_;
2625
2626 # We just use this to store a SHA1 checksum used to detect changes
2627 return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
2628 }
2629
2630 sub get_ruleset_cmdlist {
2631 my ($ruleset, $verbose) = @_;
2632
2633 my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
2634
2635 my ($active_chains, $hooks) = iptables_get_chains();
2636 my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, $verbose);
2637
2638 # create missing chains first
2639 foreach my $chain (sort keys %$ruleset) {
2640 my $stat = $statushash->{$chain};
2641 die "internal error" if !$stat;
2642 next if $stat->{action} ne 'create';
2643
2644 $cmdlist .= ":$chain - [0:0]\n";
2645 }
2646
2647 foreach my $h (qw(INPUT OUTPUT FORWARD)) {
2648 if (!$hooks->{$h}) {
2649 $cmdlist .= "-A $h -j PVEFW-$h\n";
2650 }
2651 }
2652
2653 foreach my $chain (sort keys %$ruleset) {
2654 my $stat = $statushash->{$chain};
2655 die "internal error" if !$stat;
2656
2657 if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
2658 $cmdlist .= "-F $chain\n";
2659 foreach my $cmd (@{$ruleset->{$chain}}) {
2660 $cmdlist .= "$cmd\n";
2661 }
2662 $cmdlist .= print_sig_rule($chain, $stat->{sig});
2663 } elsif ($stat->{action} eq 'delete') {
2664 die "internal error"; # this should not happen
2665 } elsif ($stat->{action} eq 'exists') {
2666 # do nothing
2667 } else {
2668 die "internal error - unknown status '$stat->{action}'";
2669 }
2670 }
2671
2672 foreach my $chain (keys %$statushash) {
2673 next if $statushash->{$chain}->{action} ne 'delete';
2674 $cmdlist .= "-F $chain\n";
2675 }
2676 foreach my $chain (keys %$statushash) {
2677 next if $statushash->{$chain}->{action} ne 'delete';
2678 next if $chain eq 'PVEFW-INPUT';
2679 next if $chain eq 'PVEFW-OUTPUT';
2680 next if $chain eq 'PVEFW-FORWARD';
2681 $cmdlist .= "-X $chain\n";
2682 }
2683
2684 my $changes = $cmdlist ne "*filter\n" ? 1 : 0;
2685
2686 $cmdlist .= "COMMIT\n";
2687
2688 return wantarray ? ($cmdlist, $changes) : $cmdlist;
2689 }
2690
2691 sub get_ipset_cmdlist {
2692 my ($ruleset, $verbose) = @_;
2693
2694 my $cmdlist = "";
2695
2696 my $delete_cmdlist = "";
2697
2698 my $active_chains = ipset_get_chains();
2699 my $statushash = get_ruleset_status($ruleset, $active_chains, \&ipset_chain_digest, $verbose);
2700
2701 # remove stale _swap chains
2702 foreach my $chain (keys %$active_chains) {
2703 if ($chain =~ m/^PVEFW-\S+_swap$/) {
2704 $cmdlist .= "destroy $chain\n";
2705 }
2706 }
2707
2708 foreach my $chain (sort keys %$ruleset) {
2709 my $stat = $statushash->{$chain};
2710 die "internal error" if !$stat;
2711
2712 if ($stat->{action} eq 'create') {
2713 foreach my $cmd (@{$ruleset->{$chain}}) {
2714 $cmdlist .= "$cmd\n";
2715 }
2716 }
2717
2718 if ($stat->{action} eq 'update') {
2719 my $chain_swap = $chain."_swap";
2720
2721 foreach my $cmd (@{$ruleset->{$chain}}) {
2722 $cmd =~ s/$chain/$chain_swap/;
2723 $cmdlist .= "$cmd\n";
2724 }
2725 $cmdlist .= "swap $chain_swap $chain\n";
2726 $cmdlist .= "flush $chain_swap\n";
2727 $cmdlist .= "destroy $chain_swap\n";
2728 }
2729
2730 }
2731
2732 foreach my $chain (keys %$statushash) {
2733 next if $statushash->{$chain}->{action} ne 'delete';
2734
2735 $delete_cmdlist .= "flush $chain\n";
2736 $delete_cmdlist .= "destroy $chain\n";
2737 }
2738
2739 my $changes = ($cmdlist || $delete_cmdlist) ? 1 : 0;
2740
2741 return ($cmdlist, $delete_cmdlist, $changes);
2742 }
2743
2744 sub apply_ruleset {
2745 my ($ruleset, $hostfw_conf, $ipset_ruleset, $verbose) = @_;
2746
2747 enable_bridge_firewall();
2748
2749 update_nf_conntrack_max($hostfw_conf);
2750
2751 my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
2752 get_ipset_cmdlist($ipset_ruleset, undef, $verbose);
2753
2754 my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset, $verbose);
2755
2756 if ($verbose) {
2757 if ($ipset_changes) {
2758 print "ipset changes:\n";
2759 print $ipset_create_cmdlist if $ipset_create_cmdlist;
2760 print $ipset_delete_cmdlist if $ipset_delete_cmdlist;
2761 }
2762
2763 if ($changes) {
2764 print "iptables changes:\n";
2765 print $cmdlist;
2766 }
2767 }
2768
2769 ipset_restore_cmdlist($ipset_create_cmdlist);
2770
2771 iptables_restore_cmdlist($cmdlist);
2772
2773 ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
2774
2775 # test: re-read status and check if everything is up to date
2776 my $active_chains = iptables_get_chains();
2777 my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, 0);
2778
2779 my $errors;
2780 foreach my $chain (sort keys %$ruleset) {
2781 my $stat = $statushash->{$chain};
2782 if ($stat->{action} ne 'exists') {
2783 warn "unable to update chain '$chain'\n";
2784 $errors = 1;
2785 }
2786 }
2787
2788 die "unable to apply firewall changes\n" if $errors;
2789 }
2790
2791 sub update_nf_conntrack_max {
2792 my ($hostfw_conf) = @_;
2793
2794 my $max = 65536; # reasonable default
2795
2796 my $options = $hostfw_conf->{options} || {};
2797
2798 if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
2799 $max = $options->{nf_conntrack_max};
2800 $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
2801 }
2802
2803 my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
2804 my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
2805
2806 my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
2807
2808 if ($current != $max) {
2809 my $hashsize = int($max/4);
2810 PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
2811 PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
2812 }
2813 }
2814
2815 sub remove_pvefw_chains {
2816
2817 my ($chash, $hooks) = iptables_get_chains();
2818 my $cmdlist = "*filter\n";
2819
2820 foreach my $h (qw(INPUT OUTPUT FORWARD)) {
2821 if ($hooks->{$h}) {
2822 $cmdlist .= "-D $h -j PVEFW-$h\n";
2823 }
2824 }
2825
2826 foreach my $chain (keys %$chash) {
2827 $cmdlist .= "-F $chain\n";
2828 }
2829
2830 foreach my $chain (keys %$chash) {
2831 $cmdlist .= "-X $chain\n";
2832 }
2833 $cmdlist .= "COMMIT\n";
2834
2835 iptables_restore_cmdlist($cmdlist);
2836 }
2837
2838 sub update {
2839 my ($start, $verbose) = @_;
2840
2841 my $code = sub {
2842 my $status = read_pvefw_status();
2843
2844 my ($ruleset, $hostfw_conf, $ipset_ruleset) = compile();
2845
2846 if ($start || $status eq 'active') {
2847
2848 save_pvefw_status('active') if ($status ne 'active');
2849
2850 apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $verbose);
2851 } else {
2852 print "Firewall not active (status = $status)\n" if $verbose;
2853 }
2854 };
2855
2856 run_locked($code);
2857 }
2858
2859
2860 1;
Firewall test scripts