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local_network: ipv6 support + correctness
[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 Socket qw(AF_INET6 inet_ntop inet_pton);
9 use PVE::INotify;
10 use PVE::Exception qw(raise raise_param_exc);
11 use PVE::JSONSchema qw(register_standard_option get_standard_option);
12 use PVE::Cluster;
13 use PVE::ProcFSTools;
14 use PVE::Tools qw($IPV4RE $IPV6RE);
15 use File::Basename;
16 use File::Path;
17 use IO::File;
18 use Net::IP;
19 use PVE::Tools qw(run_command lock_file dir_glob_foreach);
20 use Encode;
21
22 my $hostfw_conf_filename = "/etc/pve/local/host.fw";
23 my $pvefw_conf_dir = "/etc/pve/firewall";
24 my $clusterfw_conf_filename = "$pvefw_conf_dir/cluster.fw";
25
26 # dynamically include PVE::QemuServer and PVE::OpenVZ
27 # to avoid dependency problems
28 my $have_qemu_server;
29 eval {
30 require PVE::QemuServer;
31 $have_qemu_server = 1;
32 };
33
34 my $have_pve_manager;
35 eval {
36 require PVE::OpenVZ;
37 $have_pve_manager = 1;
38 };
39
40 my $pve_fw_status_dir = "/var/lib/pve-firewall";
41
42 mkdir $pve_fw_status_dir; # make sure this exists
43
44 my $security_group_name_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
45 my $ipset_name_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
46 our $ip_alias_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
47
48 my $max_alias_name_length = 64;
49 my $max_ipset_name_length = 64;
50 my $max_group_name_length = 20;
51
52 PVE::JSONSchema::register_format('IPorCIDR', \&pve_verify_ip_or_cidr);
53 sub pve_verify_ip_or_cidr {
54 my ($cidr, $noerr) = @_;
55
56 if ($cidr =~ m!^(?:$IPV6RE|$IPV4RE)(/(\d+))?$!) {
57 return $cidr if Net::IP->new($cidr);
58 return undef if $noerr;
59 die Net::IP::Error() . "\n";
60 }
61 return undef if $noerr;
62 die "value does not look like a valid IP address or CIDR network\n";
63 }
64
65 PVE::JSONSchema::register_format('IPorCIDRorAlias', \&pve_verify_ip_or_cidr_or_alias);
66 sub pve_verify_ip_or_cidr_or_alias {
67 my ($cidr, $noerr) = @_;
68
69 return if $cidr =~ m/^(?:$ip_alias_pattern)$/;
70
71 return pve_verify_ip_or_cidr($cidr, $noerr);
72 }
73
74 PVE::JSONSchema::register_standard_option('ipset-name', {
75 description => "IP set name.",
76 type => 'string',
77 pattern => $ipset_name_pattern,
78 minLength => 2,
79 maxLength => $max_ipset_name_length,
80 });
81
82 PVE::JSONSchema::register_standard_option('pve-fw-alias', {
83 description => "Alias name.",
84 type => 'string',
85 pattern => $ip_alias_pattern,
86 minLength => 2,
87 maxLength => $max_alias_name_length,
88 });
89
90 PVE::JSONSchema::register_standard_option('pve-fw-loglevel' => {
91 description => "Log level.",
92 type => 'string',
93 enum => ['emerg', 'alert', 'crit', 'err', 'warning', 'notice', 'info', 'debug', 'nolog'],
94 optional => 1,
95 });
96
97 PVE::JSONSchema::register_standard_option('pve-security-group-name', {
98 description => "Security Group name.",
99 type => 'string',
100 pattern => $security_group_name_pattern,
101 minLength => 2,
102 maxLength => $max_group_name_length,
103 });
104
105 my $feature_ipset_nomatch = 0;
106 eval {
107 my (undef, undef, $release) = POSIX::uname();
108 if ($release =~ m/^(\d+)\.(\d+)\.\d+-/) {
109 my ($major, $minor) = ($1, $2);
110 $feature_ipset_nomatch = 1 if ($major > 3) ||
111 ($major == 3 && $minor >= 7);
112 }
113
114 };
115
116 my $nodename = PVE::INotify::nodename();
117
118 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
119
120 my $default_log_level = 'nolog'; # avoid logs by default
121
122 my $log_level_hash = {
123 debug => 7,
124 info => 6,
125 notice => 5,
126 warning => 4,
127 err => 3,
128 crit => 2,
129 alert => 1,
130 emerg => 0,
131 };
132
133 # we need to overwrite some macros for ipv6
134 my $pve_ipv6fw_macros = {
135 'Ping' => [
136 { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
137 ],
138 'NeighborDiscovery' => [
139 "IPv6 neighbor solicitation, neighbor and router advertisement",
140 { action => 'PARAM', proto => 'icmpv6', dport => 'router-advertisement' },
141 { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-solicitation' },
142 { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-advertisement' },
143 ],
144 'Trcrt' => [
145 { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
146 { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
147 ],
148 };
149
150 # imported/converted from: /usr/share/shorewall/macro.*
151 my $pve_fw_macros = {
152 'Amanda' => [
153 "Amanda Backup",
154 { action => 'PARAM', proto => 'udp', dport => '10080' },
155 { action => 'PARAM', proto => 'tcp', dport => '10080' },
156 ],
157 'Auth' => [
158 "Auth (identd) traffic",
159 { action => 'PARAM', proto => 'tcp', dport => '113' },
160 ],
161 'BGP' => [
162 "Border Gateway Protocol traffic",
163 { action => 'PARAM', proto => 'tcp', dport => '179' },
164 ],
165 'BitTorrent' => [
166 "BitTorrent traffic for BitTorrent 3.1 and earlier",
167 { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
168 { action => 'PARAM', proto => 'udp', dport => '6881' },
169 ],
170 'BitTorrent32' => [
171 "BitTorrent traffic for BitTorrent 3.2 and later",
172 { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
173 { action => 'PARAM', proto => 'udp', dport => '6881' },
174 ],
175 'Ceph' => [
176 "Ceph Storage Cluster traffic (Ceph Monitors, OSD & MDS Deamons)",
177 { action => 'PARAM', proto => 'tcp', dport => '6789' },
178 { action => 'PARAM', proto => 'tcp', dport => '6800:7300' },
179 ],
180 'CVS' => [
181 "Concurrent Versions System pserver traffic",
182 { action => 'PARAM', proto => 'tcp', dport => '2401' },
183 ],
184 'Citrix' => [
185 "Citrix/ICA traffic (ICA, ICA Browser, CGP)",
186 { action => 'PARAM', proto => 'tcp', dport => '1494' },
187 { action => 'PARAM', proto => 'udp', dport => '1604' },
188 { action => 'PARAM', proto => 'tcp', dport => '2598' },
189 ],
190 'DAAP' => [
191 "Digital Audio Access Protocol traffic (iTunes, Rythmbox daemons)",
192 { action => 'PARAM', proto => 'tcp', dport => '3689' },
193 { action => 'PARAM', proto => 'udp', dport => '3689' },
194 ],
195 'DCC' => [
196 "Distributed Checksum Clearinghouse spam filtering mechanism",
197 { action => 'PARAM', proto => 'tcp', dport => '6277' },
198 ],
199 'DHCPfwd' => [
200 "Forwarded DHCP traffic",
201 { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
202 ],
203 'DNS' => [
204 "Domain Name System traffic (upd and tcp)",
205 { action => 'PARAM', proto => 'udp', dport => '53' },
206 { action => 'PARAM', proto => 'tcp', dport => '53' },
207 ],
208 'Distcc' => [
209 "Distributed Compiler service",
210 { action => 'PARAM', proto => 'tcp', dport => '3632' },
211 ],
212 'FTP' => [
213 "File Transfer Protocol",
214 { action => 'PARAM', proto => 'tcp', dport => '21' },
215 ],
216 'Finger' => [
217 "Finger protocol (RFC 742)",
218 { action => 'PARAM', proto => 'tcp', dport => '79' },
219 ],
220 'GNUnet' => [
221 "GNUnet secure peer-to-peer networking traffic",
222 { action => 'PARAM', proto => 'tcp', dport => '2086' },
223 { action => 'PARAM', proto => 'udp', dport => '2086' },
224 { action => 'PARAM', proto => 'tcp', dport => '1080' },
225 { action => 'PARAM', proto => 'udp', dport => '1080' },
226 ],
227 'GRE' => [
228 "Generic Routing Encapsulation tunneling protocol",
229 { action => 'PARAM', proto => '47' },
230 ],
231 'Git' => [
232 "Git distributed revision control traffic",
233 { action => 'PARAM', proto => 'tcp', dport => '9418' },
234 ],
235 'HKP' => [
236 "OpenPGP HTTP keyserver protocol traffic",
237 { action => 'PARAM', proto => 'tcp', dport => '11371' },
238 ],
239 'HTTP' => [
240 "Hypertext Transfer Protocol (WWW)",
241 { action => 'PARAM', proto => 'tcp', dport => '80' },
242 ],
243 'HTTPS' => [
244 "Hypertext Transfer Protocol (WWW) over SSL",
245 { action => 'PARAM', proto => 'tcp', dport => '443' },
246 ],
247 'ICPV2' => [
248 "Internet Cache Protocol V2 (Squid) traffic",
249 { action => 'PARAM', proto => 'udp', dport => '3130' },
250 ],
251 'ICQ' => [
252 "AOL Instant Messenger traffic",
253 { action => 'PARAM', proto => 'tcp', dport => '5190' },
254 ],
255 'IMAP' => [
256 "Internet Message Access Protocol",
257 { action => 'PARAM', proto => 'tcp', dport => '143' },
258 ],
259 'IMAPS' => [
260 "Internet Message Access Protocol over SSL",
261 { action => 'PARAM', proto => 'tcp', dport => '993' },
262 ],
263 'IPIP' => [
264 "IPIP capsulation traffic",
265 { action => 'PARAM', proto => '94' },
266 ],
267 'IPsec' => [
268 "IPsec traffic",
269 { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
270 { action => 'PARAM', proto => '50' },
271 ],
272 'IPsecah' => [
273 "IPsec authentication (AH) traffic",
274 { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
275 { action => 'PARAM', proto => '51' },
276 ],
277 'IPsecnat' => [
278 "IPsec traffic and Nat-Traversal",
279 { action => 'PARAM', proto => 'udp', dport => '500' },
280 { action => 'PARAM', proto => 'udp', dport => '4500' },
281 { action => 'PARAM', proto => '50' },
282 ],
283 'IRC' => [
284 "Internet Relay Chat traffic",
285 { action => 'PARAM', proto => 'tcp', dport => '6667' },
286 ],
287 'Jetdirect' => [
288 "HP Jetdirect printing",
289 { action => 'PARAM', proto => 'tcp', dport => '9100' },
290 ],
291 'L2TP' => [
292 "Layer 2 Tunneling Protocol traffic",
293 { action => 'PARAM', proto => 'udp', dport => '1701' },
294 ],
295 'LDAP' => [
296 "Lightweight Directory Access Protocol traffic",
297 { action => 'PARAM', proto => 'tcp', dport => '389' },
298 ],
299 'LDAPS' => [
300 "Secure Lightweight Directory Access Protocol traffic",
301 { action => 'PARAM', proto => 'tcp', dport => '636' },
302 ],
303 'MSNP' => [
304 "Microsoft Notification Protocol",
305 { action => 'PARAM', proto => 'tcp', dport => '1863' },
306 ],
307 'MSSQL' => [
308 "Microsoft SQL Server",
309 { action => 'PARAM', proto => 'tcp', dport => '1433' },
310 ],
311 'Mail' => [
312 "Mail traffic (SMTP, SMTPS, Submission)",
313 { action => 'PARAM', proto => 'tcp', dport => '25' },
314 { action => 'PARAM', proto => 'tcp', dport => '465' },
315 { action => 'PARAM', proto => 'tcp', dport => '587' },
316 ],
317 'Munin' => [
318 "Munin networked resource monitoring traffic",
319 { action => 'PARAM', proto => 'tcp', dport => '4949' },
320 ],
321 'MySQL' => [
322 "MySQL server",
323 { action => 'PARAM', proto => 'tcp', dport => '3306' },
324 ],
325 'NNTP' => [
326 "NNTP traffic (Usenet).",
327 { action => 'PARAM', proto => 'tcp', dport => '119' },
328 ],
329 'NNTPS' => [
330 "Encrypted NNTP traffic (Usenet)",
331 { action => 'PARAM', proto => 'tcp', dport => '563' },
332 ],
333 'NTP' => [
334 "Network Time Protocol (ntpd)",
335 { action => 'PARAM', proto => 'udp', dport => '123' },
336 ],
337 'OSPF' => [
338 "OSPF multicast traffic",
339 { action => 'PARAM', proto => '89' },
340 ],
341 'OpenVPN' => [
342 "OpenVPN traffic",
343 { action => 'PARAM', proto => 'udp', dport => '1194' },
344 ],
345 'PCA' => [
346 "Symantec PCAnywere (tm)",
347 { action => 'PARAM', proto => 'udp', dport => '5632' },
348 { action => 'PARAM', proto => 'tcp', dport => '5631' },
349 ],
350 'POP3' => [
351 "POP3 traffic",
352 { action => 'PARAM', proto => 'tcp', dport => '110' },
353 ],
354 'POP3S' => [
355 "Encrypted POP3 traffic",
356 { action => 'PARAM', proto => 'tcp', dport => '995' },
357 ],
358 'PPtP' => [
359 "Point-to-Point Tunneling Protocol",
360 { action => 'PARAM', proto => '47' },
361 { action => 'PARAM', proto => 'tcp', dport => '1723' },
362 ],
363 'Ping' => [
364 "ICMP echo request",
365 { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
366 ],
367 'PostgreSQL' => [
368 "PostgreSQL server",
369 { action => 'PARAM', proto => 'tcp', dport => '5432' },
370 ],
371 'Printer' => [
372 "Line Printer protocol printing",
373 { action => 'PARAM', proto => 'tcp', dport => '515' },
374 ],
375 'RDP' => [
376 "Microsoft Remote Desktop Protocol traffic",
377 { action => 'PARAM', proto => 'tcp', dport => '3389' },
378 ],
379 'RIP' => [
380 "Routing Information Protocol (bidirectional)",
381 { action => 'PARAM', proto => 'udp', dport => '520' },
382 ],
383 'RNDC' => [
384 "BIND remote management protocol",
385 { action => 'PARAM', proto => 'tcp', dport => '953' },
386 ],
387 'Razor' => [
388 "Razor Antispam System",
389 { action => 'ACCEPT', proto => 'tcp', dport => '2703' },
390 ],
391 'Rdate' => [
392 "Remote time retrieval (rdate)",
393 { action => 'PARAM', proto => 'tcp', dport => '37' },
394 ],
395 'Rsync' => [
396 "Rsync server",
397 { action => 'PARAM', proto => 'tcp', dport => '873' },
398 ],
399 'SANE' => [
400 "SANE network scanning",
401 { action => 'PARAM', proto => 'tcp', dport => '6566' },
402 ],
403 'SMB' => [
404 "Microsoft SMB traffic",
405 { action => 'PARAM', proto => 'udp', dport => '135,445' },
406 { action => 'PARAM', proto => 'udp', dport => '137:139' },
407 { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
408 { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
409 ],
410 'SMBswat' => [
411 "Samba Web Administration Tool",
412 { action => 'PARAM', proto => 'tcp', dport => '901' },
413 ],
414 'SMTP' => [
415 "Simple Mail Transfer Protocol",
416 { action => 'PARAM', proto => 'tcp', dport => '25' },
417 ],
418 'SMTPS' => [
419 "Encrypted Simple Mail Transfer Protocol",
420 { action => 'PARAM', proto => 'tcp', dport => '465' },
421 ],
422 'SNMP' => [
423 "Simple Network Management Protocol",
424 { action => 'PARAM', proto => 'udp', dport => '161:162' },
425 { action => 'PARAM', proto => 'tcp', dport => '161' },
426 ],
427 'SPAMD' => [
428 "Spam Assassin SPAMD traffic",
429 { action => 'PARAM', proto => 'tcp', dport => '783' },
430 ],
431 'SSH' => [
432 "Secure shell traffic",
433 { action => 'PARAM', proto => 'tcp', dport => '22' },
434 ],
435 'SVN' => [
436 "Subversion server (svnserve)",
437 { action => 'PARAM', proto => 'tcp', dport => '3690' },
438 ],
439 'SixXS' => [
440 "SixXS IPv6 Deployment and Tunnel Broker",
441 { action => 'PARAM', proto => 'tcp', dport => '3874' },
442 { action => 'PARAM', proto => 'udp', dport => '3740' },
443 { action => 'PARAM', proto => '41' },
444 { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
445 ],
446 'Squid' => [
447 "Squid web proxy traffic",
448 { action => 'PARAM', proto => 'tcp', dport => '3128' },
449 ],
450 'Submission' => [
451 "Mail message submission traffic",
452 { action => 'PARAM', proto => 'tcp', dport => '587' },
453 ],
454 'Syslog' => [
455 "Syslog protocol (RFC 5424) traffic",
456 { action => 'PARAM', proto => 'udp', dport => '514' },
457 { action => 'PARAM', proto => 'tcp', dport => '514' },
458 ],
459 'TFTP' => [
460 "Trivial File Transfer Protocol traffic",
461 { action => 'PARAM', proto => 'udp', dport => '69' },
462 ],
463 'Telnet' => [
464 "Telnet traffic",
465 { action => 'PARAM', proto => 'tcp', dport => '23' },
466 ],
467 'Telnets' => [
468 "Telnet over SSL",
469 { action => 'PARAM', proto => 'tcp', dport => '992' },
470 ],
471 'Time' => [
472 "RFC 868 Time protocol",
473 { action => 'PARAM', proto => 'tcp', dport => '37' },
474 ],
475 'Trcrt' => [
476 "Traceroute (for up to 30 hops) traffic",
477 { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
478 { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
479 ],
480 'VNC' => [
481 "VNC traffic for VNC display's 0 - 99",
482 { action => 'PARAM', proto => 'tcp', dport => '5900:5999' },
483 ],
484 'VNCL' => [
485 "VNC traffic from Vncservers to Vncviewers in listen mode",
486 { action => 'PARAM', proto => 'tcp', dport => '5500' },
487 ],
488 'Web' => [
489 "WWW traffic (HTTP and HTTPS)",
490 { action => 'PARAM', proto => 'tcp', dport => '80' },
491 { action => 'PARAM', proto => 'tcp', dport => '443' },
492 ],
493 'Webcache' => [
494 "Web Cache/Proxy traffic (port 8080)",
495 { action => 'PARAM', proto => 'tcp', dport => '8080' },
496 ],
497 'Webmin' => [
498 "Webmin traffic",
499 { action => 'PARAM', proto => 'tcp', dport => '10000' },
500 ],
501 'Whois' => [
502 "Whois (nicname, RFC 3912) traffic",
503 { action => 'PARAM', proto => 'tcp', dport => '43' },
504 ],
505 };
506
507 my $pve_fw_parsed_macros;
508 my $pve_fw_macro_descr;
509 my $pve_fw_macro_ipversion = {};
510 my $pve_fw_preferred_macro_names = {};
511
512 my $pve_std_chains = {};
513 $pve_std_chains->{4} = {
514 'PVEFW-SET-ACCEPT-MARK' => [
515 "-j MARK --set-mark 1",
516 ],
517 'PVEFW-DropBroadcast' => [
518 # same as shorewall 'Broadcast'
519 # simply DROP BROADCAST/MULTICAST/ANYCAST
520 # we can use this to reduce logging
521 { action => 'DROP', dsttype => 'BROADCAST' },
522 { action => 'DROP', dsttype => 'MULTICAST' },
523 { action => 'DROP', dsttype => 'ANYCAST' },
524 { action => 'DROP', dest => '224.0.0.0/4' },
525 ],
526 'PVEFW-reject' => [
527 # same as shorewall 'reject'
528 { action => 'DROP', dsttype => 'BROADCAST' },
529 { action => 'DROP', source => '224.0.0.0/4' },
530 { action => 'DROP', proto => 'icmp' },
531 "-p tcp -j REJECT --reject-with tcp-reset",
532 "-p udp -j REJECT --reject-with icmp-port-unreachable",
533 "-p icmp -j REJECT --reject-with icmp-host-unreachable",
534 "-j REJECT --reject-with icmp-host-prohibited",
535 ],
536 'PVEFW-Drop' => [
537 # same as shorewall 'Drop', which is equal to DROP,
538 # but REJECT/DROP some packages to reduce logging,
539 # and ACCEPT critical ICMP types
540 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
541 # we are not interested in BROADCAST/MULTICAST/ANYCAST
542 { action => 'PVEFW-DropBroadcast' },
543 # ACCEPT critical ICMP types
544 { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
545 { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
546 # Drop packets with INVALID state
547 "-m conntrack --ctstate INVALID -j DROP",
548 # Drop Microsoft SMB noise
549 { action => 'DROP', proto => 'udp', dport => '135,445', nbdport => 2 },
550 { action => 'DROP', proto => 'udp', dport => '137:139'},
551 { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
552 { action => 'DROP', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
553 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
554 # Drop new/NotSyn traffic so that it doesn't get logged
555 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
556 # Drop DNS replies
557 { action => 'DROP', proto => 'udp', sport => 53 },
558 ],
559 'PVEFW-Reject' => [
560 # same as shorewall 'Reject', which is equal to Reject,
561 # but REJECT/DROP some packages to reduce logging,
562 # and ACCEPT critical ICMP types
563 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
564 # we are not interested in BROADCAST/MULTICAST/ANYCAST
565 { action => 'PVEFW-DropBroadcast' },
566 # ACCEPT critical ICMP types
567 { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
568 { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
569 # Drop packets with INVALID state
570 "-m conntrack --ctstate INVALID -j DROP",
571 # Drop Microsoft SMB noise
572 { action => 'PVEFW-reject', proto => 'udp', dport => '135,445', nbdport => 2 },
573 { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
574 { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
575 { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
576 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
577 # Drop new/NotSyn traffic so that it doesn't get logged
578 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
579 # Drop DNS replies
580 { action => 'DROP', proto => 'udp', sport => 53 },
581 ],
582 'PVEFW-tcpflags' => [
583 # same as shorewall tcpflags action.
584 # Packets arriving on this interface are checked for som illegal combinations of TCP flags
585 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
586 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
587 "-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
588 "-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
589 "-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
590 ],
591 'PVEFW-smurfs' => [
592 # same as shorewall smurfs action
593 # Filter packets for smurfs (packets with a broadcast address as the source).
594 "-s 0.0.0.0/32 -j RETURN",
595 "-m addrtype --src-type BROADCAST -g PVEFW-smurflog",
596 "-s 224.0.0.0/4 -g PVEFW-smurflog",
597 ],
598 };
599
600 $pve_std_chains->{6} = {
601 'PVEFW-SET-ACCEPT-MARK' => [
602 "-j MARK --set-mark 1",
603 ],
604 'PVEFW-DropBroadcast' => [
605 # same as shorewall 'Broadcast'
606 # simply DROP BROADCAST/MULTICAST/ANYCAST
607 # we can use this to reduce logging
608 #{ action => 'DROP', dsttype => 'BROADCAST' }, #no broadcast in ipv6
609 # ipv6 addrtype does not work with kernel 2.6.32
610 #{ action => 'DROP', dsttype => 'MULTICAST' },
611 #{ action => 'DROP', dsttype => 'ANYCAST' },
612 { action => 'DROP', dest => 'ff00::/8' },
613 #{ action => 'DROP', dest => '224.0.0.0/4' },
614 ],
615 'PVEFW-reject' => [
616 # same as shorewall 'reject'
617 #{ action => 'DROP', dsttype => 'BROADCAST' },
618 #{ action => 'DROP', source => '224.0.0.0/4' },
619 { action => 'DROP', proto => 'icmpv6' },
620 "-p tcp -j REJECT --reject-with tcp-reset",
621 #"-p udp -j REJECT --reject-with icmp-port-unreachable",
622 #"-p icmp -j REJECT --reject-with icmp-host-unreachable",
623 #"-j REJECT --reject-with icmp-host-prohibited",
624 ],
625 'PVEFW-Drop' => [
626 # same as shorewall 'Drop', which is equal to DROP,
627 # but REJECT/DROP some packages to reduce logging,
628 # and ACCEPT critical ICMP types
629 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
630 # we are not interested in BROADCAST/MULTICAST/ANYCAST
631 { action => 'PVEFW-DropBroadcast' },
632 # ACCEPT critical ICMP types
633 { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
634 { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
635 { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
636
637 # Drop packets with INVALID state
638 "-m conntrack --ctstate INVALID -j DROP",
639 # Drop Microsoft SMB noise
640 { action => 'DROP', proto => 'udp', dport => '135,445', nbdport => 2 },
641 { action => 'DROP', proto => 'udp', dport => '137:139'},
642 { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
643 { action => 'DROP', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
644 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
645 # Drop new/NotSyn traffic so that it doesn't get logged
646 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
647 # Drop DNS replies
648 { action => 'DROP', proto => 'udp', sport => 53 },
649 ],
650 'PVEFW-Reject' => [
651 # same as shorewall 'Reject', which is equal to Reject,
652 # but REJECT/DROP some packages to reduce logging,
653 # and ACCEPT critical ICMP types
654 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
655 # we are not interested in BROADCAST/MULTICAST/ANYCAST
656 { action => 'PVEFW-DropBroadcast' },
657 # ACCEPT critical ICMP types
658 { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
659 { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
660 { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
661
662 # Drop packets with INVALID state
663 "-m conntrack --ctstate INVALID -j DROP",
664 # Drop Microsoft SMB noise
665 { action => 'PVEFW-reject', proto => 'udp', dport => '135,445', nbdport => 2 },
666 { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
667 { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
668 { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
669 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
670 # Drop new/NotSyn traffic so that it doesn't get logged
671 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
672 # Drop DNS replies
673 { action => 'DROP', proto => 'udp', sport => 53 },
674 ],
675 'PVEFW-tcpflags' => [
676 # same as shorewall tcpflags action.
677 # Packets arriving on this interface are checked for som illegal combinations of TCP flags
678 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
679 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
680 "-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
681 "-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
682 "-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
683 ],
684 };
685
686 # iptables -p icmp -h
687 my $icmp_type_names = {
688 any => 1,
689 'echo-reply' => 1,
690 'destination-unreachable' => 1,
691 'network-unreachable' => 1,
692 'host-unreachable' => 1,
693 'protocol-unreachable' => 1,
694 'port-unreachable' => 1,
695 'fragmentation-needed' => 1,
696 'source-route-failed' => 1,
697 'network-unknown' => 1,
698 'host-unknown' => 1,
699 'network-prohibited' => 1,
700 'host-prohibited' => 1,
701 'TOS-network-unreachable' => 1,
702 'TOS-host-unreachable' => 1,
703 'communication-prohibited' => 1,
704 'host-precedence-violation' => 1,
705 'precedence-cutoff' => 1,
706 'source-quench' => 1,
707 'redirect' => 1,
708 'network-redirect' => 1,
709 'host-redirect' => 1,
710 'TOS-network-redirect' => 1,
711 'TOS-host-redirect' => 1,
712 'echo-request' => 1,
713 'router-advertisement' => 1,
714 'router-solicitation' => 1,
715 'time-exceeded' => 1,
716 'ttl-zero-during-transit' => 1,
717 'ttl-zero-during-reassembly' => 1,
718 'parameter-problem' => 1,
719 'ip-header-bad' => 1,
720 'required-option-missing' => 1,
721 'timestamp-request' => 1,
722 'timestamp-reply' => 1,
723 'address-mask-request' => 1,
724 'address-mask-reply' => 1,
725 };
726
727 # ip6tables -p icmpv6 -h
728
729 my $icmpv6_type_names = {
730 'any' => 1,
731 'destination-unreachable' => 1,
732 'no-route' => 1,
733 'communication-prohibited' => 1,
734 'address-unreachable' => 1,
735 'port-unreachable' => 1,
736 'packet-too-big' => 1,
737 'time-exceeded' => 1,
738 'ttl-zero-during-transit' => 1,
739 'ttl-zero-during-reassembly' => 1,
740 'parameter-problem' => 1,
741 'bad-header' => 1,
742 'unknown-header-type' => 1,
743 'unknown-option' => 1,
744 'echo-request' => 1,
745 'echo-reply' => 1,
746 'router-solicitation' => 1,
747 'router-advertisement' => 1,
748 'neighbor-solicitation' => 1,
749 'neighbour-solicitation' => 1,
750 'neighbor-advertisement' => 1,
751 'neighbour-advertisement' => 1,
752 'redirect' => 1,
753 };
754
755 sub init_firewall_macros {
756
757 $pve_fw_parsed_macros = {};
758
759 my $parse = sub {
760 my ($k, $macro) = @_;
761 my $lc_name = lc($k);
762 $pve_fw_macro_ipversion->{$k} = 0;
763 while (!ref($macro->[0])) {
764 my $desc = shift @$macro;
765 if ($desc eq 'ipv4only') {
766 $pve_fw_macro_ipversion->{$k} = 4;
767 } elsif ($desc eq 'ipv6only') {
768 $pve_fw_macro_ipversion->{$k} = 6;
769 } else {
770 $pve_fw_macro_descr->{$k} = $desc;
771 }
772 }
773 $pve_fw_preferred_macro_names->{$lc_name} = $k;
774 $pve_fw_parsed_macros->{$k} = $macro;
775 };
776
777 foreach my $k (keys %$pve_fw_macros) {
778 &$parse($k, $pve_fw_macros->{$k});
779 }
780
781 foreach my $k (keys %$pve_ipv6fw_macros) {
782 next if $pve_fw_parsed_macros->{$k};
783 &$parse($k, $pve_ipv6fw_macros->{$k});
784 $pve_fw_macro_ipversion->{$k} = 6;
785 }
786 }
787
788 init_firewall_macros();
789
790 sub get_macros {
791 return wantarray ? ($pve_fw_parsed_macros, $pve_fw_macro_descr): $pve_fw_parsed_macros;
792 }
793
794 my $etc_services;
795
796 sub get_etc_services {
797
798 return $etc_services if $etc_services;
799
800 my $filename = "/etc/services";
801
802 my $fh = IO::File->new($filename, O_RDONLY);
803 if (!$fh) {
804 warn "unable to read '$filename' - $!\n";
805 return {};
806 }
807
808 my $services = {};
809
810 while (my $line = <$fh>) {
811 chomp ($line);
812 next if $line =~m/^#/;
813 next if ($line =~m/^\s*$/);
814
815 if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp).*$!) {
816 $services->{byid}->{$2}->{name} = $1;
817 $services->{byid}->{$2}->{port} = $2;
818 $services->{byid}->{$2}->{$3} = 1;
819 $services->{byname}->{$1} = $services->{byid}->{$2};
820 }
821 }
822
823 close($fh);
824
825 $etc_services = $services;
826
827
828 return $etc_services;
829 }
830
831 my $etc_protocols;
832
833 sub get_etc_protocols {
834 return $etc_protocols if $etc_protocols;
835
836 my $filename = "/etc/protocols";
837
838 my $fh = IO::File->new($filename, O_RDONLY);
839 if (!$fh) {
840 warn "unable to read '$filename' - $!\n";
841 return {};
842 }
843
844 my $protocols = {};
845
846 while (my $line = <$fh>) {
847 chomp ($line);
848 next if $line =~m/^#/;
849 next if ($line =~m/^\s*$/);
850
851 if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
852 $protocols->{byid}->{$2}->{name} = $1;
853 $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
854 }
855 }
856
857 close($fh);
858
859 # add special case for ICMP v6
860 $protocols->{byid}->{icmpv6}->{name} = "icmpv6";
861 $protocols->{byname}->{icmpv6} = $protocols->{byid}->{icmpv6};
862
863 $etc_protocols = $protocols;
864
865 return $etc_protocols;
866 }
867
868 my $ipv4_mask_hash_localnet = {
869 '255.255.0.0' => 16,
870 '255.255.128.0' => 17,
871 '255.255.192.0' => 18,
872 '255.255.224.0' => 19,
873 '255.255.240.0' => 20,
874 '255.255.248.0' => 21,
875 '255.255.252.0' => 22,
876 '255.255.254.0' => 23,
877 '255.255.255.0' => 24,
878 '255.255.255.128' => 25,
879 '255.255.255.192' => 26,
880 '255.255.255.224' => 27,
881 '255.255.255.240' => 28,
882 '255.255.255.248' => 29,
883 '255.255.255.252' => 30,
884 };
885
886 my $__local_network;
887
888 sub local_network {
889 my ($new_value) = @_;
890
891 $__local_network = $new_value if defined($new_value);
892
893 return $__local_network if defined($__local_network);
894
895 eval {
896 my $nodename = PVE::INotify::nodename();
897
898 my $ip = PVE::Cluster::remote_node_ip($nodename);
899
900 my $testip = Net::IP->new($ip);
901
902 my $isv6 = $testip->version == 6;
903 my $routes = $isv6 ? PVE::ProcFSTools::read_proc_net_ipv6_route()
904 : PVE::ProcFSTools::read_proc_net_route();
905 foreach my $entry (@$routes) {
906 my $mask;
907 if ($isv6) {
908 $mask = $entry->{prefix};
909 } else {
910 $mask = $ipv4_mask_hash_localnet->{$entry->{mask}};
911 next if !defined($mask);
912 }
913 my $cidr = "$entry->{dest}/$mask";
914 my $testnet = Net::IP->new($cidr);
915 if ($testnet->overlaps($testip) == $Net::IP::IP_B_IN_A_OVERLAP) {
916 $__local_network = $cidr;
917 return;
918 }
919 }
920 };
921 warn $@ if $@;
922
923 return $__local_network;
924 }
925
926 # ipset names are limited to 31 characters,
927 # and we use '-v4' or '-v6' to indicate IP versions,
928 # and we use '_swap' suffix for atomic update,
929 # for example PVEFW-${VMID}-${ipset_name}_swap
930
931 my $max_iptables_ipset_name_length = 31 - length("PVEFW-") - length("_swap");
932
933 sub compute_ipset_chain_name {
934 my ($vmid, $ipset_name, $ipversion) = @_;
935
936 $vmid = 0 if !defined($vmid);
937
938 my $id = "$vmid-${ipset_name}-v$ipversion";
939
940 if (length($id) > $max_iptables_ipset_name_length) {
941 $id = PVE::Tools::fnv31a_hex($id);
942 }
943
944 return "PVEFW-$id";
945 }
946
947 sub compute_ipfilter_ipset_name {
948 my ($iface) = @_;
949
950 return "ipfilter-$iface";
951 }
952
953 sub parse_address_list {
954 my ($str) = @_;
955
956 if ($str =~ m/^(\+)(\S+)$/) { # ipset ref
957 die "ipset name too long\n" if length($str) > ($max_ipset_name_length + 1);
958 return;
959 }
960
961 if ($str =~ m/^${ip_alias_pattern}$/) {
962 die "alias name too long\n" if length($str) > $max_alias_name_length;
963 return;
964 }
965
966 my $count = 0;
967 my $iprange = 0;
968 my $ipversion;
969
970 foreach my $elem (split(/,/, $str)) {
971 $count++;
972 my $ip = Net::IP->new($elem);
973 if (!$ip) {
974 my $err = Net::IP::Error();
975 die "invalid IP address: $err\n";
976 }
977 $iprange = 1 if $elem =~ m/-/;
978
979 my $new_ipversion = Net::IP::ip_is_ipv6($ip->ip()) ? 6 : 4;
980
981 die "detected mixed ipv4/ipv6 addresses in address list '$str'\n"
982 if $ipversion && ($new_ipversion != $ipversion);
983
984 $ipversion = $new_ipversion;
985 }
986
987 die "you can't use a range in a list\n" if $iprange && $count > 1;
988
989 return $ipversion;
990 }
991
992 sub parse_port_name_number_or_range {
993 my ($str) = @_;
994
995 my $services = PVE::Firewall::get_etc_services();
996 my $count = 0;
997 my $icmp_port = 0;
998
999 foreach my $item (split(/,/, $str)) {
1000 $count++;
1001 if ($item =~ m/^(\d+):(\d+)$/) {
1002 my ($port1, $port2) = ($1, $2);
1003 die "invalid port '$port1'\n" if $port1 > 65535;
1004 die "invalid port '$port2'\n" if $port2 > 65535;
1005 } elsif ($item =~ m/^(\d+)$/) {
1006 my $port = $1;
1007 die "invalid port '$port'\n" if $port > 65535;
1008 } else {
1009 if ($icmp_type_names->{$item}) {
1010 $icmp_port = 1;
1011 } elsif ($icmpv6_type_names->{$item}) {
1012 $icmp_port = 1;
1013 } else {
1014 die "invalid port '$item'\n" if !$services->{byname}->{$item};
1015 }
1016 }
1017 }
1018
1019 die "ICPM ports not allowed in port range\n" if $icmp_port && $count > 1;
1020
1021 return $count;
1022 }
1023
1024 PVE::JSONSchema::register_format('pve-fw-port-spec', \&pve_fw_verify_port_spec);
1025 sub pve_fw_verify_port_spec {
1026 my ($portstr) = @_;
1027
1028 parse_port_name_number_or_range($portstr);
1029
1030 return $portstr;
1031 }
1032
1033 PVE::JSONSchema::register_format('pve-fw-addr-spec', \&pve_fw_verify_addr_spec);
1034 sub pve_fw_verify_addr_spec {
1035 my ($list) = @_;
1036
1037 parse_address_list($list);
1038
1039 return $list;
1040 }
1041
1042 PVE::JSONSchema::register_format('pve-fw-protocol-spec', \&pve_fw_verify_protocol_spec);
1043 sub pve_fw_verify_protocol_spec {
1044 my ($proto) = @_;
1045
1046 my $protocols = get_etc_protocols();
1047
1048 die "unknown protocol '$proto'\n" if $proto &&
1049 !(defined($protocols->{byname}->{$proto}) ||
1050 defined($protocols->{byid}->{$proto}));
1051
1052 return $proto;
1053 }
1054
1055
1056 # helper function for API
1057
1058 sub copy_opject_with_digest {
1059 my ($object) = @_;
1060
1061 my $sha = Digest::SHA->new('sha1');
1062
1063 my $res = {};
1064 foreach my $k (sort keys %$object) {
1065 my $v = $object->{$k};
1066 next if !defined($v);
1067 $res->{$k} = $v;
1068 $sha->add($k, ':', $v, "\n");
1069 }
1070
1071 my $digest = $sha->hexdigest;
1072
1073 $res->{digest} = $digest;
1074
1075 return wantarray ? ($res, $digest) : $res;
1076 }
1077
1078 sub copy_list_with_digest {
1079 my ($list) = @_;
1080
1081 my $sha = Digest::SHA->new('sha1');
1082
1083 my $res = [];
1084 foreach my $entry (@$list) {
1085 my $data = {};
1086 foreach my $k (sort keys %$entry) {
1087 my $v = $entry->{$k};
1088 next if !defined($v);
1089 $data->{$k} = $v;
1090 # Note: digest ignores refs ($rule->{errors})
1091 $sha->add($k, ':', $v, "\n") if !ref($v); ;
1092 }
1093 push @$res, $data;
1094 }
1095
1096 my $digest = $sha->hexdigest;
1097
1098 foreach my $entry (@$res) {
1099 $entry->{digest} = $digest;
1100 }
1101
1102 return wantarray ? ($res, $digest) : $res;
1103 }
1104
1105 my $rule_properties = {
1106 pos => {
1107 description => "Update rule at position <pos>.",
1108 type => 'integer',
1109 minimum => 0,
1110 optional => 1,
1111 },
1112 digest => get_standard_option('pve-config-digest'),
1113 type => {
1114 type => 'string',
1115 optional => 1,
1116 enum => ['in', 'out', 'group'],
1117 },
1118 action => {
1119 description => "Rule action ('ACCEPT', 'DROP', 'REJECT') or security group name.",
1120 type => 'string',
1121 optional => 1,
1122 pattern => $security_group_name_pattern,
1123 maxLength => 20,
1124 minLength => 2,
1125 },
1126 macro => {
1127 type => 'string',
1128 optional => 1,
1129 maxLength => 128,
1130 },
1131 iface => get_standard_option('pve-iface', { optional => 1 }),
1132 source => {
1133 type => 'string', format => 'pve-fw-addr-spec',
1134 optional => 1,
1135 },
1136 dest => {
1137 type => 'string', format => 'pve-fw-addr-spec',
1138 optional => 1,
1139 },
1140 proto => {
1141 type => 'string', format => 'pve-fw-protocol-spec',
1142 optional => 1,
1143 },
1144 enable => {
1145 type => 'integer',
1146 minimum => 0,
1147 optional => 1,
1148 },
1149 sport => {
1150 type => 'string', format => 'pve-fw-port-spec',
1151 optional => 1,
1152 },
1153 dport => {
1154 type => 'string', format => 'pve-fw-port-spec',
1155 optional => 1,
1156 },
1157 comment => {
1158 type => 'string',
1159 optional => 1,
1160 },
1161 };
1162
1163 sub add_rule_properties {
1164 my ($properties) = @_;
1165
1166 foreach my $k (keys %$rule_properties) {
1167 my $h = $rule_properties->{$k};
1168 # copy data, so that we can modify later without side effects
1169 foreach my $opt (keys %$h) { $properties->{$k}->{$opt} = $h->{$opt}; }
1170 }
1171
1172 return $properties;
1173 }
1174
1175 sub delete_rule_properties {
1176 my ($rule, $delete_str) = @_;
1177
1178 foreach my $opt (PVE::Tools::split_list($delete_str)) {
1179 raise_param_exc({ 'delete' => "no such property ('$opt')"})
1180 if !defined($rule_properties->{$opt});
1181 raise_param_exc({ 'delete' => "unable to delete required property '$opt'"})
1182 if $opt eq 'type' || $opt eq 'action';
1183 delete $rule->{$opt};
1184 }
1185
1186 return $rule;
1187 }
1188
1189 my $apply_macro = sub {
1190 my ($macro_name, $param, $verify, $ipversion) = @_;
1191
1192 my $macro_rules = $pve_fw_parsed_macros->{$macro_name};
1193 die "unknown macro '$macro_name'\n" if !$macro_rules; # should not happen
1194
1195 if ($ipversion && ($ipversion == 6) && $pve_ipv6fw_macros->{$macro_name}) {
1196 $macro_rules = $pve_ipv6fw_macros->{$macro_name};
1197 }
1198
1199 # skip macros which are specific to another ipversion
1200 return if ($ipversion//0) != ($pve_fw_macro_ipversion->{$macro_name}//0);
1201
1202 my $rules = [];
1203
1204 foreach my $templ (@$macro_rules) {
1205 my $rule = {};
1206 my $param_used = {};
1207 foreach my $k (keys %$templ) {
1208 my $v = $templ->{$k};
1209 if ($v eq 'PARAM') {
1210 $v = $param->{$k};
1211 $param_used->{$k} = 1;
1212 } elsif ($v eq 'DEST') {
1213 $v = $param->{dest};
1214 $param_used->{dest} = 1;
1215 } elsif ($v eq 'SOURCE') {
1216 $v = $param->{source};
1217 $param_used->{source} = 1;
1218 }
1219
1220 if (!defined($v)) {
1221 my $msg = "missing parameter '$k' in macro '$macro_name'";
1222 raise_param_exc({ macro => $msg }) if $verify;
1223 die "$msg\n";
1224 }
1225 $rule->{$k} = $v;
1226 }
1227 foreach my $k (keys %$param) {
1228 next if $k eq 'macro';
1229 next if !defined($param->{$k});
1230 next if $param_used->{$k};
1231 if (defined($rule->{$k})) {
1232 if ($rule->{$k} ne $param->{$k}) {
1233 my $msg = "parameter '$k' already define in macro (value = '$rule->{$k}')";
1234 raise_param_exc({ $k => $msg }) if $verify;
1235 die "$msg\n";
1236 }
1237 } else {
1238 $rule->{$k} = $param->{$k};
1239 }
1240 }
1241 push @$rules, $rule;
1242 }
1243
1244 return $rules;
1245 };
1246
1247 my $rule_env_iface_lookup = {
1248 'ct' => 1,
1249 'vm' => 1,
1250 'group' => 0,
1251 'cluster' => 1,
1252 'host' => 1,
1253 };
1254
1255 sub verify_rule {
1256 my ($rule, $cluster_conf, $fw_conf, $rule_env, $noerr) = @_;
1257
1258 my $allow_groups = $rule_env eq 'group' ? 0 : 1;
1259
1260 my $allow_iface = $rule_env_iface_lookup->{$rule_env};
1261 die "unknown rule_env '$rule_env'\n" if !defined($allow_iface); # should not happen
1262
1263 my $errors = $rule->{errors} || {};
1264
1265 my $error_count = 0;
1266
1267 my $add_error = sub {
1268 my ($param, $msg) = @_;
1269 chomp $msg;
1270 raise_param_exc({ $param => $msg }) if !$noerr;
1271 $error_count++;
1272 $errors->{$param} = $msg if !$errors->{$param};
1273 };
1274
1275 my $ipversion;
1276 my $set_ip_version = sub {
1277 my $vers = shift;
1278 if ($vers) {
1279 die "detected mixed ipv4/ipv6 adresses in rule\n"
1280 if $ipversion && ($vers != $ipversion);
1281 $ipversion = $vers;
1282 }
1283 };
1284
1285 my $check_ipset_or_alias_property = sub {
1286 my ($name, $expected_ipversion) = @_;
1287
1288 if (my $value = $rule->{$name}) {
1289 if ($value =~ m/^\+/) {
1290 if ($value =~ m/^\+(${ipset_name_pattern})$/) {
1291 &$add_error($name, "no such ipset '$1'")
1292 if !($cluster_conf->{ipset}->{$1} || ($fw_conf && $fw_conf->{ipset}->{$1}));
1293
1294 } else {
1295 &$add_error($name, "invalid ipset name '$value'");
1296 }
1297 } elsif ($value =~ m/^${ip_alias_pattern}$/){
1298 my $alias = lc($value);
1299 &$add_error($name, "no such alias '$value'")
1300 if !($cluster_conf->{aliases}->{$alias} || ($fw_conf && $fw_conf->{aliases}->{$alias}));
1301 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1302 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1303
1304 &$set_ip_version($e->{ipversion});
1305 }
1306 }
1307 };
1308
1309 my $type = $rule->{type};
1310 my $action = $rule->{action};
1311
1312 &$add_error('type', "missing property") if !$type;
1313 &$add_error('action', "missing property") if !$action;
1314
1315 if ($type) {
1316 if ($type eq 'in' || $type eq 'out') {
1317 &$add_error('action', "unknown action '$action'")
1318 if $action && ($action !~ m/^(ACCEPT|DROP|REJECT)$/);
1319 } elsif ($type eq 'group') {
1320 &$add_error('type', "security groups not allowed")
1321 if !$allow_groups;
1322 &$add_error('action', "invalid characters in security group name")
1323 if $action && ($action !~ m/^${security_group_name_pattern}$/);
1324 } else {
1325 &$add_error('type', "unknown rule type '$type'");
1326 }
1327 }
1328
1329 if ($rule->{iface}) {
1330 &$add_error('type', "parameter -i not allowed for this rule type")
1331 if !$allow_iface;
1332 eval { PVE::JSONSchema::pve_verify_iface($rule->{iface}); };
1333 &$add_error('iface', $@) if $@;
1334 if ($rule_env eq 'vm') {
1335 &$add_error('iface', "value does not match the regex pattern 'net\\d+'")
1336 if $rule->{iface} !~ m/^net(\d+)$/;
1337 } elsif ($rule_env eq 'ct') {
1338 &$add_error('iface', "value does not match the regex pattern '(venet|eth\\d+)'")
1339 if $rule->{iface} !~ m/^(venet|eth(\d+))$/;
1340 }
1341 }
1342
1343 if ($rule->{macro}) {
1344 if (my $preferred_name = $pve_fw_preferred_macro_names->{lc($rule->{macro})}) {
1345 $rule->{macro} = $preferred_name;
1346 } else {
1347 &$add_error('macro', "unknown macro '$rule->{macro}'");
1348 }
1349 }
1350
1351 if ($rule->{proto}) {
1352 eval { pve_fw_verify_protocol_spec($rule->{proto}); };
1353 &$add_error('proto', $@) if $@;
1354 &$set_ip_version(4) if $rule->{proto} eq 'icmp';
1355 &$set_ip_version(6) if $rule->{proto} eq 'icmpv6';
1356 }
1357
1358 if ($rule->{dport}) {
1359 eval { parse_port_name_number_or_range($rule->{dport}); };
1360 &$add_error('dport', $@) if $@;
1361 &$add_error('proto', "missing property - 'dport' requires this property")
1362 if !$rule->{proto};
1363 }
1364
1365 if ($rule->{sport}) {
1366 eval { parse_port_name_number_or_range($rule->{sport}); };
1367 &$add_error('sport', $@) if $@;
1368 &$add_error('proto', "missing property - 'sport' requires this property")
1369 if !$rule->{proto};
1370 }
1371
1372 if ($rule->{source}) {
1373 eval {
1374 my $source_ipversion = parse_address_list($rule->{source});
1375 &$set_ip_version($source_ipversion);
1376 };
1377 &$add_error('source', $@) if $@;
1378 &$check_ipset_or_alias_property('source', $ipversion);
1379 }
1380
1381 if ($rule->{dest}) {
1382 eval {
1383 my $dest_ipversion = parse_address_list($rule->{dest});
1384 &$set_ip_version($dest_ipversion);
1385 };
1386 &$add_error('dest', $@) if $@;
1387 &$check_ipset_or_alias_property('dest', $ipversion);
1388 }
1389
1390 $rule->{ipversion} = $ipversion if $ipversion;
1391
1392 if ($rule->{macro} && !$error_count) {
1393 eval { &$apply_macro($rule->{macro}, $rule, 1, $ipversion); };
1394 if (my $err = $@) {
1395 if (ref($err) eq "PVE::Exception" && $err->{errors}) {
1396 my $eh = $err->{errors};
1397 foreach my $p (keys %$eh) {
1398 &$add_error($p, $eh->{$p});
1399 }
1400 } else {
1401 &$add_error('macro', "$err");
1402 }
1403 }
1404 }
1405
1406 $rule->{errors} = $errors if $error_count;
1407
1408 return $rule;
1409 }
1410
1411 sub copy_rule_data {
1412 my ($rule, $param) = @_;
1413
1414 foreach my $k (keys %$rule_properties) {
1415 if (defined(my $v = $param->{$k})) {
1416 if ($v eq '' || $v eq '-') {
1417 delete $rule->{$k};
1418 } else {
1419 $rule->{$k} = $v;
1420 }
1421 }
1422 }
1423
1424 return $rule;
1425 }
1426
1427 sub rules_modify_permissions {
1428 my ($rule_env) = @_;
1429
1430 if ($rule_env eq 'host') {
1431 return {
1432 check => ['perm', '/nodes/{node}', [ 'Sys.Modify' ]],
1433 };
1434 } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1435 return {
1436 check => ['perm', '/', [ 'Sys.Modify' ]],
1437 };
1438 } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1439 return {
1440 check => ['perm', '/vms/{vmid}', [ 'VM.Config.Network' ]],
1441 }
1442 }
1443
1444 return undef;
1445 }
1446
1447 sub rules_audit_permissions {
1448 my ($rule_env) = @_;
1449
1450 if ($rule_env eq 'host') {
1451 return {
1452 check => ['perm', '/nodes/{node}', [ 'Sys.Audit' ]],
1453 };
1454 } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1455 return {
1456 check => ['perm', '/', [ 'Sys.Audit' ]],
1457 };
1458 } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1459 return {
1460 check => ['perm', '/vms/{vmid}', [ 'VM.Audit' ]],
1461 }
1462 }
1463
1464 return undef;
1465 }
1466
1467 # core functions
1468 my $bridge_firewall_enabled = 0;
1469
1470 sub enable_bridge_firewall {
1471
1472 return if $bridge_firewall_enabled; # only once
1473
1474 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
1475 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
1476
1477 # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
1478 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
1479
1480 $bridge_firewall_enabled = 1;
1481 }
1482
1483 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
1484
1485 sub iptables_restore_cmdlist {
1486 my ($cmdlist) = @_;
1487
1488 run_command("/sbin/iptables-restore -n", input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1489 }
1490
1491 sub ip6tables_restore_cmdlist {
1492 my ($cmdlist) = @_;
1493
1494 run_command("/sbin/ip6tables-restore -n", input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1495 }
1496
1497 sub ipset_restore_cmdlist {
1498 my ($cmdlist) = @_;
1499
1500 run_command("/sbin/ipset restore", input => $cmdlist, errmsg => "ipset_restore_cmdlist");
1501 }
1502
1503 sub iptables_get_chains {
1504 my ($iptablescmd) = @_;
1505
1506 $iptablescmd = "iptables" if !$iptablescmd;
1507
1508 my $res = {};
1509
1510 # check what chains we want to track
1511 my $is_pvefw_chain = sub {
1512 my $name = shift;
1513
1514 return 1 if $name =~ m/^PVEFW-\S+$/;
1515
1516 return 1 if $name =~ m/^tap\d+i\d+-(:?IN|OUT)$/;
1517
1518 return 1 if $name =~ m/^veth\d+.\d+-(:?IN|OUT)$/; # fixme: dev name is configurable
1519
1520 return 1 if $name =~ m/^venet0-\d+-(:?IN|OUT)$/;
1521
1522 return 1 if $name =~ m/^fwbr\d+(v\d+)?-(:?FW|IN|OUT|IPS)$/;
1523 return 1 if $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/;
1524
1525 return undef;
1526 };
1527
1528 my $table = '';
1529
1530 my $hooks = {};
1531
1532 my $parser = sub {
1533 my $line = shift;
1534
1535 return if $line =~ m/^#/;
1536 return if $line =~ m/^\s*$/;
1537
1538 if ($line =~ m/^\*(\S+)$/) {
1539 $table = $1;
1540 return;
1541 }
1542
1543 return if $table ne 'filter';
1544
1545 if ($line =~ m/^:(\S+)\s/) {
1546 my $chain = $1;
1547 return if !&$is_pvefw_chain($chain);
1548 $res->{$chain} = "unknown";
1549 } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
1550 my ($chain, $sig) = ($1, $2);
1551 return if !&$is_pvefw_chain($chain);
1552 $res->{$chain} = $sig;
1553 } elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD)\s+-j\s+PVEFW-\1$/) {
1554 $hooks->{$1} = 1;
1555 } else {
1556 # simply ignore the rest
1557 return;
1558 }
1559 };
1560
1561 run_command("/sbin/$iptablescmd-save", outfunc => $parser);
1562
1563 return wantarray ? ($res, $hooks) : $res;
1564 }
1565
1566 sub iptables_chain_digest {
1567 my ($rules) = @_;
1568 my $digest = Digest::SHA->new('sha1');
1569 foreach my $rule (@$rules) { # order is important
1570 $digest->add($rule);
1571 }
1572 return $digest->b64digest;
1573 }
1574
1575 sub ipset_chain_digest {
1576 my ($rules) = @_;
1577
1578 my $digest = Digest::SHA->new('sha1');
1579 foreach my $rule (sort @$rules) { # note: sorted
1580 $digest->add($rule);
1581 }
1582 return $digest->b64digest;
1583 }
1584
1585 sub ipset_get_chains {
1586
1587 my $res = {};
1588 my $chains = {};
1589
1590 my $parser = sub {
1591 my $line = shift;
1592
1593 return if $line =~ m/^#/;
1594 return if $line =~ m/^\s*$/;
1595 if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
1596 my $chain = $1;
1597 $line =~ s/\s+$//; # delete trailing white space
1598 push @{$chains->{$chain}}, $line;
1599 } else {
1600 # simply ignore the rest
1601 return;
1602 }
1603 };
1604
1605 run_command("/sbin/ipset save", outfunc => $parser);
1606
1607 # compute digest for each chain
1608 foreach my $chain (keys %$chains) {
1609 $res->{$chain} = ipset_chain_digest($chains->{$chain});
1610 }
1611
1612 return $res;
1613 }
1614
1615 sub ruleset_generate_cmdstr {
1616 my ($ruleset, $chain, $ipversion, $rule, $actions, $goto, $cluster_conf, $fw_conf) = @_;
1617
1618 return if defined($rule->{enable}) && !$rule->{enable};
1619 return if $rule->{errors};
1620
1621 die "unable to emit macro - internal error" if $rule->{macro}; # should not happen
1622
1623 my $nbdport = defined($rule->{dport}) ? parse_port_name_number_or_range($rule->{dport}) : 0;
1624 my $nbsport = defined($rule->{sport}) ? parse_port_name_number_or_range($rule->{sport}) : 0;
1625
1626 my @cmd = ();
1627
1628 push @cmd, "-i $rule->{iface_in}" if $rule->{iface_in};
1629 push @cmd, "-o $rule->{iface_out}" if $rule->{iface_out};
1630
1631 my $source = $rule->{source};
1632 my $dest = $rule->{dest};
1633
1634 if ($source) {
1635 if ($source =~ m/^\+/) {
1636 if ($source =~ m/^\+(${ipset_name_pattern})$/) {
1637 my $name = $1;
1638 if ($fw_conf && $fw_conf->{ipset}->{$name}) {
1639 my $ipset_chain = compute_ipset_chain_name($fw_conf->{vmid}, $name, $ipversion);
1640 push @cmd, "-m set --match-set ${ipset_chain} src";
1641 } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
1642 my $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
1643 push @cmd, "-m set --match-set ${ipset_chain} src";
1644 } else {
1645 die "no such ipset '$name'\n";
1646 }
1647 } else {
1648 die "invalid security group name '$source'\n";
1649 }
1650 } elsif ($source =~ m/^${ip_alias_pattern}$/){
1651 my $alias = lc($source);
1652 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1653 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1654 die "no such alias '$source'\n" if !$e;
1655 push @cmd, "-s $e->{cidr}";
1656 } elsif ($source =~ m/\-/){
1657 push @cmd, "-m iprange --src-range $source";
1658 } else {
1659 push @cmd, "-s $source";
1660 }
1661 }
1662
1663 if ($dest) {
1664 if ($dest =~ m/^\+/) {
1665 if ($dest =~ m/^\+(${ipset_name_pattern})$/) {
1666 my $name = $1;
1667 if ($fw_conf && $fw_conf->{ipset}->{$name}) {
1668 my $ipset_chain = compute_ipset_chain_name($fw_conf->{vmid}, $name, $ipversion);
1669 push @cmd, "-m set --match-set ${ipset_chain} dst";
1670 } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
1671 my $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
1672 push @cmd, "-m set --match-set ${ipset_chain} dst";
1673 } else {
1674 die "no such ipset '$name'\n";
1675 }
1676 } else {
1677 die "invalid security group name '$dest'\n";
1678 }
1679 } elsif ($dest =~ m/^${ip_alias_pattern}$/){
1680 my $alias = lc($dest);
1681 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1682 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1683 die "no such alias '$dest'\n" if !$e;
1684 push @cmd, "-d $e->{cidr}";
1685 } elsif ($dest =~ m/^(\d+)\.(\d+).(\d+).(\d+)\-(\d+)\.(\d+).(\d+).(\d+)$/){
1686 push @cmd, "-m iprange --dst-range $dest";
1687 } else {
1688 push @cmd, "-d $dest";
1689 }
1690 }
1691
1692 if ($rule->{proto}) {
1693 push @cmd, "-p $rule->{proto}";
1694
1695 my $multiport = 0;
1696 $multiport++ if $nbdport > 1;
1697 $multiport++ if $nbsport > 1;
1698
1699 push @cmd, "--match multiport" if $multiport;
1700
1701 die "multiport: option '--sports' cannot be used together with '--dports'\n"
1702 if ($multiport == 2) && ($rule->{dport} ne $rule->{sport});
1703
1704 if ($rule->{dport}) {
1705 if ($rule->{proto} && $rule->{proto} eq 'icmp') {
1706 # Note: we use dport to store --icmp-type
1707 die "unknown icmp-type '$rule->{dport}'\n" if !defined($icmp_type_names->{$rule->{dport}});
1708 push @cmd, "-m icmp --icmp-type $rule->{dport}";
1709 } elsif ($rule->{proto} && $rule->{proto} eq 'icmpv6') {
1710 # Note: we use dport to store --icmpv6-type
1711 die "unknown icmpv6-type '$rule->{dport}'\n" if !defined($icmpv6_type_names->{$rule->{dport}});
1712 push @cmd, "-m icmpv6 --icmpv6-type $rule->{dport}";
1713 } else {
1714 if ($nbdport > 1) {
1715 if ($multiport == 2) {
1716 push @cmd, "--ports $rule->{dport}";
1717 } else {
1718 push @cmd, "--dports $rule->{dport}";
1719 }
1720 } else {
1721 push @cmd, "--dport $rule->{dport}";
1722 }
1723 }
1724 }
1725
1726 if ($rule->{sport}) {
1727 if ($nbsport > 1) {
1728 push @cmd, "--sports $rule->{sport}" if $multiport != 2;
1729 } else {
1730 push @cmd, "--sport $rule->{sport}";
1731 }
1732 }
1733 } elsif ($rule->{dport} || $rule->{sport}) {
1734 die "destination port '$rule->{dport}', but no protocol specified\n" if $rule->{dport};
1735 die "source port '$rule->{sport}', but no protocol specified\n" if $rule->{sport};
1736 }
1737
1738 push @cmd, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
1739
1740 if (my $action = $rule->{action}) {
1741 $action = $actions->{$action} if defined($actions->{$action});
1742 $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
1743 push @cmd, $goto ? "-g $action" : "-j $action";
1744 }
1745
1746 return scalar(@cmd) ? join(' ', @cmd) : undef;
1747 }
1748
1749 sub ruleset_generate_rule {
1750 my ($ruleset, $chain, $ipversion, $rule, $actions, $goto, $cluster_conf, $fw_conf) = @_;
1751
1752 my $rules;
1753
1754 if ($rule->{macro}) {
1755 $rules = &$apply_macro($rule->{macro}, $rule, 0, $ipversion);
1756 } else {
1757 $rules = [ $rule ];
1758 }
1759
1760 # update all or nothing
1761
1762 my @cmds = ();
1763 foreach my $tmp (@$rules) {
1764 if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $ipversion, $tmp, $actions, $goto, $cluster_conf, $fw_conf)) {
1765 push @cmds, $cmdstr;
1766 }
1767 }
1768
1769 foreach my $cmdstr (@cmds) {
1770 ruleset_addrule($ruleset, $chain, $cmdstr);
1771 }
1772 }
1773
1774 sub ruleset_generate_rule_insert {
1775 my ($ruleset, $chain, $ipversion, $rule, $actions, $goto) = @_;
1776
1777 die "implement me" if $rule->{macro}; # not implemented, because not needed so far
1778
1779 if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $ipversion, $rule, $actions, $goto)) {
1780 ruleset_insertrule($ruleset, $chain, $cmdstr);
1781 }
1782 }
1783
1784 sub ruleset_create_chain {
1785 my ($ruleset, $chain) = @_;
1786
1787 die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
1788 die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
1789
1790 die "chain '$chain' already exists\n" if $ruleset->{$chain};
1791
1792 $ruleset->{$chain} = [];
1793 }
1794
1795 sub ruleset_chain_exist {
1796 my ($ruleset, $chain) = @_;
1797
1798 return $ruleset->{$chain} ? 1 : undef;
1799 }
1800
1801 sub ruleset_addrule {
1802 my ($ruleset, $chain, $rule) = @_;
1803
1804 die "no such chain '$chain'\n" if !$ruleset->{$chain};
1805
1806 push @{$ruleset->{$chain}}, "-A $chain $rule";
1807 }
1808
1809 sub ruleset_insertrule {
1810 my ($ruleset, $chain, $rule) = @_;
1811
1812 die "no such chain '$chain'\n" if !$ruleset->{$chain};
1813
1814 unshift @{$ruleset->{$chain}}, "-A $chain $rule";
1815 }
1816
1817 sub get_log_rule_base {
1818 my ($chain, $vmid, $msg, $loglevel) = @_;
1819
1820 die "internal error - no log level" if !defined($loglevel);
1821
1822 $vmid = 0 if !defined($vmid);
1823
1824 # Note: we use special format for prefix to pass further
1825 # info to log daemon (VMID, LOGVELEL and CHAIN)
1826
1827 return "-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
1828 }
1829
1830 sub ruleset_addlog {
1831 my ($ruleset, $chain, $vmid, $msg, $loglevel, $rule) = @_;
1832
1833 return if !defined($loglevel);
1834
1835 my $logrule = get_log_rule_base($chain, $vmid, $msg, $loglevel);
1836
1837 $logrule = "$rule $logrule" if defined($rule);
1838
1839 ruleset_addrule($ruleset, $chain, $logrule);
1840 }
1841
1842 sub ruleset_add_chain_policy {
1843 my ($ruleset, $chain, $ipversion, $vmid, $policy, $loglevel, $accept_action) = @_;
1844
1845 if ($policy eq 'ACCEPT') {
1846
1847 ruleset_generate_rule($ruleset, $chain, $ipversion, { action => 'ACCEPT' },
1848 { ACCEPT => $accept_action});
1849
1850 } elsif ($policy eq 'DROP') {
1851
1852 ruleset_addrule($ruleset, $chain, "-j PVEFW-Drop");
1853
1854 ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
1855
1856 ruleset_addrule($ruleset, $chain, "-j DROP");
1857 } elsif ($policy eq 'REJECT') {
1858 ruleset_addrule($ruleset, $chain, "-j PVEFW-Reject");
1859
1860 ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
1861
1862 ruleset_addrule($ruleset, $chain, "-g PVEFW-reject");
1863 } else {
1864 # should not happen
1865 die "internal error: unknown policy '$policy'";
1866 }
1867 }
1868
1869 sub ruleset_chain_add_conn_filters {
1870 my ($ruleset, $chain, $accept) = @_;
1871
1872 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1873 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j $accept");
1874 }
1875
1876 sub ruleset_chain_add_input_filters {
1877 my ($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel) = @_;
1878
1879 if ($cluster_conf->{ipset}->{blacklist}){
1880 if (!ruleset_chain_exist($ruleset, "PVEFW-blacklist")) {
1881 ruleset_create_chain($ruleset, "PVEFW-blacklist");
1882 ruleset_addlog($ruleset, "PVEFW-blacklist", 0, "DROP: ", $loglevel) if $loglevel;
1883 ruleset_addrule($ruleset, "PVEFW-blacklist", "-j DROP");
1884 }
1885 my $ipset_chain = compute_ipset_chain_name(0, 'blacklist', $ipversion);
1886 ruleset_addrule($ruleset, $chain, "-m set --match-set ${ipset_chain} src -j PVEFW-blacklist");
1887 }
1888
1889 if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
1890 if ($ipversion == 4) {
1891 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
1892 }
1893 }
1894
1895 if ($options->{tcpflags}) {
1896 ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
1897 }
1898 }
1899
1900 sub ruleset_create_vm_chain {
1901 my ($ruleset, $chain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction) = @_;
1902
1903 ruleset_create_chain($ruleset, $chain);
1904 my $accept = generate_nfqueue($options);
1905
1906 if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
1907 if ($direction eq 'OUT') {
1908 ruleset_generate_rule($ruleset, $chain, $ipversion,
1909 { action => 'PVEFW-SET-ACCEPT-MARK',
1910 proto => 'udp', sport => 68, dport => 67 });
1911 } else {
1912 ruleset_generate_rule($ruleset, $chain, $ipversion,
1913 { action => 'ACCEPT',
1914 proto => 'udp', sport => 67, dport => 68 });
1915 }
1916 }
1917
1918 if ($direction eq 'OUT') {
1919 if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
1920 ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr -j DROP");
1921 }
1922 if ($ipfilter_ipset) {
1923 ruleset_addrule($ruleset, $chain, "-m set ! --match-set $ipfilter_ipset src -j DROP");
1924 }
1925 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1926 }
1927 }
1928
1929 sub ruleset_add_group_rule {
1930 my ($ruleset, $cluster_conf, $chain, $rule, $direction, $action, $ipversion) = @_;
1931
1932 my $group = $rule->{action};
1933 my $group_chain = "GROUP-$group-$direction";
1934 if(!ruleset_chain_exist($ruleset, $group_chain)){
1935 generate_group_rules($ruleset, $cluster_conf, $group, $ipversion);
1936 }
1937
1938 if ($direction eq 'OUT' && $rule->{iface_out}) {
1939 ruleset_addrule($ruleset, $chain, "-o $rule->{iface_out} -j $group_chain");
1940 } elsif ($direction eq 'IN' && $rule->{iface_in}) {
1941 ruleset_addrule($ruleset, $chain, "-i $rule->{iface_in} -j $group_chain");
1942 } else {
1943 ruleset_addrule($ruleset, $chain, "-j $group_chain");
1944 }
1945
1946 ruleset_addrule($ruleset, $chain, "-m mark --mark 1 -j $action");
1947 }
1948
1949 sub ruleset_generate_vm_rules {
1950 my ($ruleset, $rules, $cluster_conf, $vmfw_conf, $chain, $netid, $direction, $options, $ipversion) = @_;
1951
1952 my $lc_direction = lc($direction);
1953
1954 my $in_accept = generate_nfqueue($options);
1955
1956 foreach my $rule (@$rules) {
1957 next if $rule->{iface} && $rule->{iface} ne $netid;
1958 next if !$rule->{enable} || $rule->{errors};
1959 next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
1960
1961 if ($rule->{type} eq 'group') {
1962 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, $direction,
1963 $direction eq 'OUT' ? 'RETURN' : $in_accept, $ipversion);
1964 } else {
1965 next if $rule->{type} ne $lc_direction;
1966 eval {
1967 if ($direction eq 'OUT') {
1968 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
1969 { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" },
1970 undef, $cluster_conf, $vmfw_conf);
1971 } else {
1972 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
1973 { ACCEPT => $in_accept , REJECT => "PVEFW-reject" },
1974 undef, $cluster_conf, $vmfw_conf);
1975 }
1976 };
1977 warn $@ if $@;
1978 }
1979 }
1980 }
1981
1982 sub generate_nfqueue {
1983 my ($options) = @_;
1984
1985 if ($options->{ips}) {
1986 my $action = "NFQUEUE";
1987 if ($options->{ips_queues} && $options->{ips_queues} =~ m/^(\d+)(:(\d+))?$/) {
1988 if (defined($3) && defined($1)) {
1989 $action .= " --queue-balance $1:$3";
1990 } elsif (defined($1)) {
1991 $action .= " --queue-num $1";
1992 }
1993 }
1994 $action .= " --queue-bypass" if $feature_ipset_nomatch; #need kernel 3.10
1995 return $action;
1996 } else {
1997 return "ACCEPT";
1998 }
1999 }
2000
2001 sub ruleset_generate_vm_ipsrules {
2002 my ($ruleset, $options, $direction, $iface) = @_;
2003
2004 if ($options->{ips} && $direction eq 'IN') {
2005 my $nfqueue = generate_nfqueue($options);
2006
2007 if (!ruleset_chain_exist($ruleset, "PVEFW-IPS")) {
2008 ruleset_create_chain($ruleset, "PVEFW-IPS");
2009 }
2010
2011 ruleset_addrule($ruleset, "PVEFW-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged -j $nfqueue");
2012 }
2013 }
2014
2015 sub generate_venet_rules_direction {
2016 my ($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip, $direction, $ipversion) = @_;
2017
2018 my $lc_direction = lc($direction);
2019
2020 my $rules = $vmfw_conf->{rules};
2021
2022 my $options = $vmfw_conf->{options};
2023 my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
2024
2025 my $chain = "venet0-$vmid-$direction";
2026
2027 ruleset_create_vm_chain($ruleset, $chain, $ipversion, $options, undef, undef, $direction);
2028
2029 ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $chain, 'venet', $direction, undef, $ipversion);
2030
2031 # implement policy
2032 my $policy;
2033
2034 if ($direction eq 'OUT') {
2035 $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
2036 } else {
2037 $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
2038 }
2039
2040 my $accept = generate_nfqueue($options);
2041 my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
2042 ruleset_add_chain_policy($ruleset, $chain, $ipversion, $vmid, $policy, $loglevel, $accept_action);
2043
2044 if ($direction eq 'OUT') {
2045 ruleset_generate_rule_insert($ruleset, "PVEFW-VENET-OUT", $ipversion, {
2046 action => $chain,
2047 source => $ip,
2048 iface_in => 'venet0'});
2049 } else {
2050 ruleset_generate_rule($ruleset, "PVEFW-VENET-IN", $ipversion, {
2051 action => $chain,
2052 dest => $ip,
2053 iface_out => 'venet0'});
2054 }
2055 }
2056
2057 sub generate_tap_rules_direction {
2058 my ($ruleset, $cluster_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $direction, $ipversion) = @_;
2059
2060 my $lc_direction = lc($direction);
2061
2062 my $rules = $vmfw_conf->{rules};
2063
2064 my $options = $vmfw_conf->{options};
2065 my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
2066
2067 my $tapchain = "$iface-$direction";
2068
2069 my $ipfilter_name = compute_ipfilter_ipset_name($netid);
2070 my $ipfilter_ipset = compute_ipset_chain_name($vmid, $ipfilter_name, $ipversion)
2071 if $vmfw_conf->{ipset}->{$ipfilter_name};
2072
2073 # create chain with mac and ip filter
2074 ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
2075
2076 if ($options->{enable}) {
2077 ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $tapchain, $netid, $direction, $options, $ipversion);
2078
2079 ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface);
2080
2081 # implement policy
2082 my $policy;
2083
2084 if ($direction eq 'OUT') {
2085 $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
2086 } else {
2087 $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
2088 }
2089
2090 my $accept = generate_nfqueue($options);
2091 my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
2092 ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, $policy, $loglevel, $accept_action);
2093 } else {
2094 my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : 'ACCEPT';
2095 ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, 'ACCEPT', $loglevel, $accept_action);
2096 }
2097
2098 # plug the tap chain to bridge chain
2099 if ($direction eq 'IN') {
2100 ruleset_addrule($ruleset, "PVEFW-FWBR-IN",
2101 "-m physdev --physdev-is-bridged --physdev-out $iface -j $tapchain");
2102 } else {
2103 ruleset_addrule($ruleset, "PVEFW-FWBR-OUT",
2104 "-m physdev --physdev-is-bridged --physdev-in $iface -j $tapchain");
2105 }
2106 }
2107
2108 sub enable_host_firewall {
2109 my ($ruleset, $hostfw_conf, $cluster_conf, $ipversion) = @_;
2110
2111 my $options = $hostfw_conf->{options};
2112 my $cluster_options = $cluster_conf->{options};
2113 my $rules = $hostfw_conf->{rules};
2114 my $cluster_rules = $cluster_conf->{rules};
2115
2116 # host inbound firewall
2117 my $chain = "PVEFW-HOST-IN";
2118 ruleset_create_chain($ruleset, $chain);
2119
2120 my $loglevel = get_option_log_level($options, "log_level_in");
2121
2122 ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
2123
2124 ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
2125 ruleset_chain_add_input_filters($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel);
2126
2127 # we use RETURN because we need to check also tap rules
2128 my $accept_action = 'RETURN';
2129
2130 ruleset_addrule($ruleset, $chain, "-p igmp -j $accept_action"); # important for multicast
2131
2132 # add host rules first, so that cluster wide rules can be overwritten
2133 foreach my $rule (@$rules, @$cluster_rules) {
2134 next if !$rule->{enable} || $rule->{errors};
2135 next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2136
2137 $rule->{iface_in} = $rule->{iface} if $rule->{iface};
2138
2139 eval {
2140 if ($rule->{type} eq 'group') {
2141 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'IN', $accept_action, $ipversion);
2142 } elsif ($rule->{type} eq 'in') {
2143 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
2144 { ACCEPT => $accept_action, REJECT => "PVEFW-reject" },
2145 undef, $cluster_conf, $hostfw_conf);
2146 }
2147 };
2148 warn $@ if $@;
2149 delete $rule->{iface_in};
2150 }
2151
2152 # allow standard traffic for management ipset (includes cluster network)
2153 my $mngmnt_ipset_chain = compute_ipset_chain_name(0, "management", $ipversion);
2154 my $mngmntsrc = "-m set --match-set ${mngmnt_ipset_chain} src";
2155 ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 8006 -j $accept_action"); # PVE API
2156 ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 5900:5999 -j $accept_action"); # PVE VNC Console
2157 ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 3128 -j $accept_action"); # SPICE Proxy
2158 ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 22 -j $accept_action"); # SSH
2159
2160 my $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
2161 my $localnet_ver = $cluster_conf->{aliases}->{local_network}->{ipversion};
2162
2163 # corosync
2164 if ($localnet && ($ipversion == $localnet_ver)) {
2165 my $corosync_rule = "-p udp --dport 5404:5405 -j $accept_action";
2166 ruleset_addrule($ruleset, $chain, "-s $localnet -d $localnet $corosync_rule");
2167 ruleset_addrule($ruleset, $chain, "-s $localnet -m addrtype --dst-type MULTICAST $corosync_rule");
2168 }
2169
2170 # implement input policy
2171 my $policy = $cluster_options->{policy_in} || 'DROP'; # allow nothing by default
2172 ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2173
2174 # host outbound firewall
2175 $chain = "PVEFW-HOST-OUT";
2176 ruleset_create_chain($ruleset, $chain);
2177
2178 $loglevel = get_option_log_level($options, "log_level_out");
2179
2180 ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
2181
2182 ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
2183
2184 # we use RETURN because we may want to check other thigs later
2185 $accept_action = 'RETURN';
2186
2187 ruleset_addrule($ruleset, $chain, "-p igmp -j $accept_action"); # important for multicast
2188
2189 # add host rules first, so that cluster wide rules can be overwritten
2190 foreach my $rule (@$rules, @$cluster_rules) {
2191 next if !$rule->{enable} || $rule->{errors};
2192 next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2193
2194 $rule->{iface_out} = $rule->{iface} if $rule->{iface};
2195 eval {
2196 if ($rule->{type} eq 'group') {
2197 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'OUT', $accept_action, $ipversion);
2198 } elsif ($rule->{type} eq 'out') {
2199 ruleset_generate_rule($ruleset, $chain, $ipversion,
2200 $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" },
2201 undef, $cluster_conf, $hostfw_conf);
2202 }
2203 };
2204 warn $@ if $@;
2205 delete $rule->{iface_out};
2206 }
2207
2208 # allow standard traffic on cluster network
2209 if ($localnet && ($ipversion == $localnet_ver)) {
2210 ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 8006 -j $accept_action"); # PVE API
2211 ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 22 -j $accept_action"); # SSH
2212 ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 5900:5999 -j $accept_action"); # PVE VNC Console
2213 ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 3128 -j $accept_action"); # SPICE Proxy
2214
2215 my $corosync_rule = "-p udp --dport 5404:5405 -j $accept_action";
2216 ruleset_addrule($ruleset, $chain, "-d $localnet $corosync_rule");
2217 ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule");
2218 }
2219
2220 # implement output policy
2221 $policy = $cluster_options->{policy_out} || 'ACCEPT'; # allow everything by default
2222 ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2223
2224 ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
2225 ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
2226 }
2227
2228 sub generate_group_rules {
2229 my ($ruleset, $cluster_conf, $group, $ipversion) = @_;
2230
2231 my $rules = $cluster_conf->{groups}->{$group};
2232
2233 if (!$rules) {
2234 warn "no such security group '$group'\n";
2235 $rules = []; # create empty chain
2236 }
2237
2238 my $chain = "GROUP-${group}-IN";
2239
2240 ruleset_create_chain($ruleset, $chain);
2241 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
2242
2243 foreach my $rule (@$rules) {
2244 next if $rule->{type} ne 'in';
2245 next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2246 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
2247 { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" },
2248 undef, $cluster_conf);
2249 }
2250
2251 $chain = "GROUP-${group}-OUT";
2252
2253 ruleset_create_chain($ruleset, $chain);
2254 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
2255
2256 foreach my $rule (@$rules) {
2257 next if $rule->{type} ne 'out';
2258 next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2259 # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
2260 # check also other tap rules later
2261 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
2262 { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" },
2263 undef, $cluster_conf);
2264 }
2265 }
2266
2267 my $MAX_NETS = 32;
2268 my $valid_netdev_names = {};
2269 for (my $i = 0; $i < $MAX_NETS; $i++) {
2270 $valid_netdev_names->{"net$i"} = 1;
2271 }
2272
2273 sub parse_fw_rule {
2274 my ($prefix, $line, $cluster_conf, $fw_conf, $rule_env, $verbose) = @_;
2275
2276 my $orig_line = $line;
2277
2278 my $rule = {};
2279
2280 # we can add single line comments to the end of the rule
2281 if ($line =~ s/#\s*(.*?)\s*$//) {
2282 $rule->{comment} = decode('utf8', $1);
2283 }
2284
2285 # we can disable a rule when prefixed with '|'
2286
2287 $rule->{enable} = $line =~ s/^\|// ? 0 : 1;
2288
2289 $line =~ s/^(\S+)\s+(\S+)\s*// ||
2290 die "unable to parse rule: $line\n";
2291
2292 $rule->{type} = lc($1);
2293 $rule->{action} = $2;
2294
2295 if ($rule->{type} eq 'in' || $rule->{type} eq 'out') {
2296 if ($rule->{action} =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
2297 $rule->{macro} = $1;
2298 $rule->{action} = $2;
2299 }
2300 }
2301
2302 while (length($line)) {
2303 if ($line =~ s/^-i (\S+)\s*//) {
2304 $rule->{iface} = $1;
2305 next;
2306 }
2307
2308 last if $rule->{type} eq 'group';
2309
2310 if ($line =~ s/^-p (\S+)\s*//) {
2311 $rule->{proto} = $1;
2312 next;
2313 }
2314
2315 if ($line =~ s/^-dport (\S+)\s*//) {
2316 $rule->{dport} = $1;
2317 next;
2318 }
2319
2320 if ($line =~ s/^-sport (\S+)\s*//) {
2321 $rule->{sport} = $1;
2322 next;
2323 }
2324 if ($line =~ s/^-source (\S+)\s*//) {
2325 $rule->{source} = $1;
2326 next;
2327 }
2328 if ($line =~ s/^-dest (\S+)\s*//) {
2329 $rule->{dest} = $1;
2330 next;
2331 }
2332
2333 last;
2334 }
2335
2336 die "unable to parse rule parameters: $line\n" if length($line);
2337
2338 $rule = verify_rule($rule, $cluster_conf, $fw_conf, $rule_env, 1);
2339 if ($verbose && $rule->{errors}) {
2340 warn "$prefix - errors in rule parameters: $orig_line\n";
2341 foreach my $p (keys %{$rule->{errors}}) {
2342 warn " $p: $rule->{errors}->{$p}\n";
2343 }
2344 }
2345
2346 return $rule;
2347 }
2348
2349 sub parse_vmfw_option {
2350 my ($line) = @_;
2351
2352 my ($opt, $value);
2353
2354 my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2355
2356 if ($line =~ m/^(enable|dhcp|macfilter|ips):\s*(0|1)\s*$/i) {
2357 $opt = lc($1);
2358 $value = int($2);
2359 } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
2360 $opt = lc($1);
2361 $value = $2 ? lc($3) : '';
2362 } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2363 $opt = lc($1);
2364 $value = uc($3);
2365 } elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
2366 $opt = lc($1);
2367 $value = $2;
2368 } else {
2369 die "can't parse option '$line'\n"
2370 }
2371
2372 return ($opt, $value);
2373 }
2374
2375 sub parse_hostfw_option {
2376 my ($line) = @_;
2377
2378 my ($opt, $value);
2379
2380 my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2381
2382 if ($line =~ m/^(enable|nosmurfs|tcpflags):\s*(0|1)\s*$/i) {
2383 $opt = lc($1);
2384 $value = int($2);
2385 } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
2386 $opt = lc($1);
2387 $value = $2 ? lc($3) : '';
2388 } elsif ($line =~ m/^(nf_conntrack_max|nf_conntrack_tcp_timeout_established):\s*(\d+)\s*$/i) {
2389 $opt = lc($1);
2390 $value = int($2);
2391 } else {
2392 die "can't parse option '$line'\n"
2393 }
2394
2395 return ($opt, $value);
2396 }
2397
2398 sub parse_clusterfw_option {
2399 my ($line) = @_;
2400
2401 my ($opt, $value);
2402
2403 if ($line =~ m/^(enable):\s*(\d+)\s*$/i) {
2404 $opt = lc($1);
2405 $value = int($2);
2406 if (($value > 1) && ((time() - $value) > 60)) {
2407 $value = 0
2408 }
2409 } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2410 $opt = lc($1);
2411 $value = uc($3);
2412 } else {
2413 die "can't parse option '$line'\n"
2414 }
2415
2416 return ($opt, $value);
2417 }
2418
2419 sub resolve_alias {
2420 my ($clusterfw_conf, $fw_conf, $cidr) = @_;
2421
2422 my $alias = lc($cidr);
2423 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2424 $e = $clusterfw_conf->{aliases}->{$alias} if !$e && $clusterfw_conf;
2425
2426 die "no such alias '$cidr'\n" if !$e;;
2427
2428 return wantarray ? ($e->{cidr}, $e->{ipversion}) : $e->{cidr};
2429 }
2430
2431 sub parse_ip_or_cidr {
2432 my ($cidr) = @_;
2433
2434 my $ipversion;
2435
2436 if ($cidr =~ m!^(?:$IPV6RE)(/(\d+))?$!) {
2437 $cidr =~ s|/128$||;
2438 $ipversion = 6;
2439 } elsif ($cidr =~ m!^(?:$IPV4RE)(/(\d+))?$!) {
2440 $cidr =~ s|/32$||;
2441 $ipversion = 4;
2442 } else {
2443 die "value does not look like a valid IP address or CIDR network\n";
2444 }
2445
2446 return wantarray ? ($cidr, $ipversion) : $cidr;
2447 }
2448
2449 sub parse_alias {
2450 my ($line) = @_;
2451
2452 # we can add single line comments to the end of the line
2453 my $comment = decode('utf8', $1) if $line =~ s/\s*#\s*(.*?)\s*$//;
2454
2455 if ($line =~ m/^(\S+)\s(\S+)$/) {
2456 my ($name, $cidr) = ($1, $2);
2457 my $ipversion;
2458
2459 ($cidr, $ipversion) = parse_ip_or_cidr($cidr);
2460
2461 my $data = {
2462 name => $name,
2463 cidr => $cidr,
2464 ipversion => $ipversion,
2465 };
2466 $data->{comment} = $comment if $comment;
2467 return $data;
2468 }
2469
2470 return undef;
2471 }
2472
2473 sub generic_fw_config_parser {
2474 my ($filename, $fh, $verbose, $cluster_conf, $empty_conf, $rule_env) = @_;
2475
2476 my $section;
2477 my $group;
2478
2479 my $res = $empty_conf;
2480
2481 while (defined(my $line = <$fh>)) {
2482 next if $line =~ m/^#/;
2483 next if $line =~ m/^\s*$/;
2484
2485 chomp $line;
2486
2487 my $linenr = $fh->input_line_number();
2488 my $prefix = "$filename (line $linenr)";
2489
2490 if ($empty_conf->{options} && ($line =~ m/^\[options\]$/i)) {
2491 $section = 'options';
2492 next;
2493 }
2494
2495 if ($empty_conf->{aliases} && ($line =~ m/^\[aliases\]$/i)) {
2496 $section = 'aliases';
2497 next;
2498 }
2499
2500 if ($empty_conf->{groups} && ($line =~ m/^\[group\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2501 $section = 'groups';
2502 $group = lc($1);
2503 my $comment = $2;
2504 eval {
2505 die "security group name too long\n" if length($group) > $max_group_name_length;
2506 die "invalid security group name '$group'\n" if $group !~ m/^${security_group_name_pattern}$/;
2507 };
2508 if (my $err = $@) {
2509 ($section, $group, $comment) = undef;
2510 warn "$prefix: $err";
2511 next;
2512 }
2513
2514 $res->{$section}->{$group} = [];
2515 $res->{group_comments}->{$group} = decode('utf8', $comment)
2516 if $comment;
2517 next;
2518 }
2519
2520 if ($empty_conf->{rules} && ($line =~ m/^\[rules\]$/i)) {
2521 $section = 'rules';
2522 next;
2523 }
2524
2525 if ($empty_conf->{ipset} && ($line =~ m/^\[ipset\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2526 $section = 'ipset';
2527 $group = lc($1);
2528 my $comment = $2;
2529 eval {
2530 die "ipset name too long\n" if length($group) > $max_ipset_name_length;
2531 die "invalid ipset name '$group'\n" if $group !~ m/^${ipset_name_pattern}$/;
2532 };
2533 if (my $err = $@) {
2534 ($section, $group, $comment) = undef;
2535 warn "$prefix: $err";
2536 next;
2537 }
2538
2539 $res->{$section}->{$group} = [];
2540 $res->{ipset_comments}->{$group} = decode('utf8', $comment)
2541 if $comment;
2542 next;
2543 }
2544
2545 if (!$section) {
2546 warn "$prefix: skip line - no section\n";
2547 next;
2548 }
2549
2550 if ($section eq 'options') {
2551 eval {
2552 my ($opt, $value);
2553 if ($rule_env eq 'cluster') {
2554 ($opt, $value) = parse_clusterfw_option($line);
2555 } elsif ($rule_env eq 'host') {
2556 ($opt, $value) = parse_hostfw_option($line);
2557 } else {
2558 ($opt, $value) = parse_vmfw_option($line);
2559 }
2560 $res->{options}->{$opt} = $value;
2561 };
2562 warn "$prefix: $@" if $@;
2563 } elsif ($section eq 'aliases') {
2564 eval {
2565 my $data = parse_alias($line);
2566 $res->{aliases}->{lc($data->{name})} = $data;
2567 };
2568 warn "$prefix: $@" if $@;
2569 } elsif ($section eq 'rules') {
2570 my $rule;
2571 eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, $res, $rule_env, $verbose); };
2572 if (my $err = $@) {
2573 warn "$prefix: $err";
2574 next;
2575 }
2576 push @{$res->{$section}}, $rule;
2577 } elsif ($section eq 'groups') {
2578 my $rule;
2579 eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, undef, 'group', $verbose); };
2580 if (my $err = $@) {
2581 warn "$prefix: $err";
2582 next;
2583 }
2584 push @{$res->{$section}->{$group}}, $rule;
2585 } elsif ($section eq 'ipset') {
2586 # we can add single line comments to the end of the rule
2587 my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
2588
2589 $line =~ m/^(\!)?\s*(\S+)\s*$/;
2590 my $nomatch = $1;
2591 my $cidr = $2;
2592 my $errors;
2593
2594 if ($nomatch && !$feature_ipset_nomatch) {
2595 $errors->{nomatch} = "nomatch not supported by kernel";
2596 }
2597
2598 eval {
2599 if ($cidr =~ m/^${ip_alias_pattern}$/) {
2600 resolve_alias($cluster_conf, $res, $cidr); # make sure alias exists
2601 } else {
2602 $cidr = parse_ip_or_cidr($cidr);
2603 }
2604 };
2605 if (my $err = $@) {
2606 chomp $err;
2607 $errors->{cidr} = $err;
2608 }
2609
2610 my $entry = { cidr => $cidr };
2611 $entry->{nomatch} = 1 if $nomatch;
2612 $entry->{comment} = $comment if $comment;
2613 $entry->{errors} = $errors if $errors;
2614
2615 if ($verbose && $errors) {
2616 warn "$prefix - errors in ipset '$group': $line\n";
2617 foreach my $p (keys %{$errors}) {
2618 warn " $p: $errors->{$p}\n";
2619 }
2620 }
2621
2622 push @{$res->{$section}->{$group}}, $entry;
2623 } else {
2624 warn "$prefix: skip line - unknown section\n";
2625 next;
2626 }
2627 }
2628
2629 return $res;
2630 }
2631
2632 sub parse_hostfw_config {
2633 my ($filename, $fh, $cluster_conf, $verbose) = @_;
2634
2635 my $empty_conf = { rules => [], options => {}};
2636
2637 return generic_fw_config_parser($filename, $fh, $verbose, $cluster_conf, $empty_conf, 'host');
2638 }
2639
2640 sub parse_vmfw_config {
2641 my ($filename, $fh, $cluster_conf, $rule_env, $verbose) = @_;
2642
2643 my $empty_conf = {
2644 rules => [],
2645 options => {},
2646 aliases => {},
2647 ipset => {} ,
2648 ipset_comments => {},
2649 };
2650
2651 return generic_fw_config_parser($filename, $fh, $verbose, $cluster_conf, $empty_conf, $rule_env);
2652 }
2653
2654 sub parse_clusterfw_config {
2655 my ($filename, $fh, $verbose) = @_;
2656
2657 my $section;
2658 my $group;
2659
2660 my $empty_conf = {
2661 rules => [],
2662 options => {},
2663 aliases => {},
2664 groups => {},
2665 group_comments => {},
2666 ipset => {} ,
2667 ipset_comments => {},
2668 };
2669
2670 return generic_fw_config_parser($filename, $fh, $verbose, $empty_conf, $empty_conf, 'cluster');
2671 }
2672
2673 sub run_locked {
2674 my ($code, @param) = @_;
2675
2676 my $timeout = 10;
2677
2678 my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
2679
2680 die $@ if $@;
2681
2682 return $res;
2683 }
2684
2685 sub read_local_vm_config {
2686
2687 my $openvz = {};
2688 my $qemu = {};
2689
2690 my $vmdata = { openvz => $openvz, qemu => $qemu };
2691
2692 my $vmlist = PVE::Cluster::get_vmlist();
2693 return $vmdata if !$vmlist || !$vmlist->{ids};
2694 my $ids = $vmlist->{ids};
2695
2696 foreach my $vmid (keys %$ids) {
2697 next if !$vmid; # skip VE0
2698 my $d = $ids->{$vmid};
2699 next if !$d->{node} || $d->{node} ne $nodename;
2700 next if !$d->{type};
2701 if ($d->{type} eq 'openvz') {
2702 if ($have_pve_manager) {
2703 my $cfspath = PVE::OpenVZ::cfs_config_path($vmid);
2704 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2705 $openvz->{$vmid} = $conf;
2706 }
2707 }
2708 } elsif ($d->{type} eq 'qemu') {
2709 if ($have_qemu_server) {
2710 my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
2711 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2712 $qemu->{$vmid} = $conf;
2713 }
2714 }
2715 }
2716 }
2717
2718 return $vmdata;
2719 };
2720
2721 sub load_vmfw_conf {
2722 my ($cluster_conf, $rule_env, $vmid, $dir, $verbose) = @_;
2723
2724 my $vmfw_conf = {};
2725
2726 $dir = $pvefw_conf_dir if !defined($dir);
2727
2728 my $filename = "$dir/$vmid.fw";
2729 if (my $fh = IO::File->new($filename, O_RDONLY)) {
2730 $vmfw_conf = parse_vmfw_config($filename, $fh, $cluster_conf, $rule_env, $verbose);
2731 $vmfw_conf->{vmid} = $vmid;
2732 }
2733
2734 return $vmfw_conf;
2735 }
2736
2737 my $format_rules = sub {
2738 my ($rules, $allow_iface) = @_;
2739
2740 my $raw = '';
2741
2742 foreach my $rule (@$rules) {
2743 if ($rule->{type} eq 'in' || $rule->{type} eq 'out' || $rule->{type} eq 'group') {
2744 $raw .= '|' if defined($rule->{enable}) && !$rule->{enable};
2745 $raw .= uc($rule->{type});
2746 if ($rule->{macro}) {
2747 $raw .= " $rule->{macro}($rule->{action})";
2748 } else {
2749 $raw .= " " . $rule->{action};
2750 }
2751 if ($allow_iface && $rule->{iface}) {
2752 $raw .= " -i $rule->{iface}";
2753 }
2754
2755 if ($rule->{type} ne 'group') {
2756 $raw .= " -source $rule->{source}" if $rule->{source};
2757 $raw .= " -dest $rule->{dest}" if $rule->{dest};
2758 $raw .= " -p $rule->{proto}" if $rule->{proto};
2759 $raw .= " -dport $rule->{dport}" if $rule->{dport};
2760 $raw .= " -sport $rule->{sport}" if $rule->{sport};
2761 }
2762
2763 $raw .= " # " . encode('utf8', $rule->{comment})
2764 if $rule->{comment} && $rule->{comment} !~ m/^\s*$/;
2765 $raw .= "\n";
2766 } else {
2767 die "unknown rule type '$rule->{type}'";
2768 }
2769 }
2770
2771 return $raw;
2772 };
2773
2774 my $format_options = sub {
2775 my ($options) = @_;
2776
2777 my $raw = '';
2778
2779 $raw .= "[OPTIONS]\n\n";
2780 foreach my $opt (keys %$options) {
2781 $raw .= "$opt: $options->{$opt}\n";
2782 }
2783 $raw .= "\n";
2784
2785 return $raw;
2786 };
2787
2788 my $format_aliases = sub {
2789 my ($aliases) = @_;
2790
2791 my $raw = '';
2792
2793 $raw .= "[ALIASES]\n\n";
2794 foreach my $k (keys %$aliases) {
2795 my $e = $aliases->{$k};
2796 $raw .= "$e->{name} $e->{cidr}";
2797 $raw .= " # " . encode('utf8', $e->{comment})
2798 if $e->{comment} && $e->{comment} !~ m/^\s*$/;
2799 $raw .= "\n";
2800 }
2801 $raw .= "\n";
2802
2803 return $raw;
2804 };
2805
2806 my $format_ipsets = sub {
2807 my ($fw_conf) = @_;
2808
2809 my $raw = '';
2810
2811 foreach my $ipset (sort keys %{$fw_conf->{ipset}}) {
2812 if (my $comment = $fw_conf->{ipset_comments}->{$ipset}) {
2813 my $utf8comment = encode('utf8', $comment);
2814 $raw .= "[IPSET $ipset] # $utf8comment\n\n";
2815 } else {
2816 $raw .= "[IPSET $ipset]\n\n";
2817 }
2818 my $options = $fw_conf->{ipset}->{$ipset};
2819
2820 my $nethash = {};
2821 foreach my $entry (@$options) {
2822 $nethash->{$entry->{cidr}} = $entry;
2823 }
2824
2825 foreach my $cidr (sort keys %$nethash) {
2826 my $entry = $nethash->{$cidr};
2827 my $line = $entry->{nomatch} ? '!' : '';
2828 $line .= $entry->{cidr};
2829 $line .= " # " . encode('utf8', $entry->{comment})
2830 if $entry->{comment} && $entry->{comment} !~ m/^\s*$/;
2831 $raw .= "$line\n";
2832 }
2833
2834 $raw .= "\n";
2835 }
2836
2837 return $raw;
2838 };
2839
2840 sub save_vmfw_conf {
2841 my ($vmid, $vmfw_conf) = @_;
2842
2843 my $raw = '';
2844
2845 my $options = $vmfw_conf->{options};
2846 $raw .= &$format_options($options) if $options && scalar(keys %$options);
2847
2848 my $aliases = $vmfw_conf->{aliases};
2849 $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
2850
2851 $raw .= &$format_ipsets($vmfw_conf) if $vmfw_conf->{ipset};
2852
2853 my $rules = $vmfw_conf->{rules} || [];
2854 if ($rules && scalar(@$rules)) {
2855 $raw .= "[RULES]\n\n";
2856 $raw .= &$format_rules($rules, 1);
2857 $raw .= "\n";
2858 }
2859
2860 mkdir $pvefw_conf_dir;
2861
2862 my $filename = "$pvefw_conf_dir/$vmid.fw";
2863 PVE::Tools::file_set_contents($filename, $raw);
2864 }
2865
2866 sub read_vm_firewall_configs {
2867 my ($cluster_conf, $vmdata, $dir, $verbose) = @_;
2868
2869 my $vmfw_configs = {};
2870
2871 foreach my $vmid (keys %{$vmdata->{qemu}}) {
2872 my $vmfw_conf = load_vmfw_conf($cluster_conf, 'vm', $vmid, $dir, $verbose);
2873 next if !$vmfw_conf->{options}; # skip if file does not exists
2874 $vmfw_configs->{$vmid} = $vmfw_conf;
2875 }
2876 foreach my $vmid (keys %{$vmdata->{openvz}}) {
2877 my $vmfw_conf = load_vmfw_conf($cluster_conf, 'ct', $vmid, $dir, $verbose);
2878 next if !$vmfw_conf->{options}; # skip if file does not exists
2879 $vmfw_configs->{$vmid} = $vmfw_conf;
2880 }
2881
2882 return $vmfw_configs;
2883 }
2884
2885 sub get_option_log_level {
2886 my ($options, $k) = @_;
2887
2888 my $v = $options->{$k};
2889 $v = $default_log_level if !defined($v);
2890
2891 return undef if $v eq '' || $v eq 'nolog';
2892
2893 $v = $log_level_hash->{$v} if defined($log_level_hash->{$v});
2894
2895 return $v if ($v >= 0) && ($v <= 7);
2896
2897 warn "unknown log level ($k = '$v')\n";
2898
2899 return undef;
2900 }
2901
2902 sub generate_std_chains {
2903 my ($ruleset, $options, $ipversion) = @_;
2904
2905 my $std_chains = $pve_std_chains->{$ipversion} || die "internal error";
2906
2907 my $loglevel = get_option_log_level($options, 'smurf_log_level');
2908
2909 my $chain;
2910
2911 if ($ipversion == 4) {
2912 # same as shorewall smurflog.
2913 $chain = 'PVEFW-smurflog';
2914 $std_chains->{$chain} = [];
2915
2916 push @{$std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
2917 push @{$std_chains->{$chain}}, "-j DROP";
2918 }
2919
2920 # same as shorewall logflags action.
2921 $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
2922 $chain = 'PVEFW-logflags';
2923 $std_chains->{$chain} = [];
2924
2925 # fixme: is this correctly logged by pvewf-logger? (ther is no --log-ip-options for NFLOG)
2926 push @{$std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
2927 push @{$std_chains->{$chain}}, "-j DROP";
2928
2929 foreach my $chain (keys %$std_chains) {
2930 ruleset_create_chain($ruleset, $chain);
2931 foreach my $rule (@{$std_chains->{$chain}}) {
2932 if (ref($rule)) {
2933 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule);
2934 } else {
2935 ruleset_addrule($ruleset, $chain, $rule);
2936 }
2937 }
2938 }
2939 }
2940
2941 sub generate_ipset_chains {
2942 my ($ipset_ruleset, $clusterfw_conf, $fw_conf) = @_; #fixme
2943
2944 foreach my $ipset (keys %{$fw_conf->{ipset}}) {
2945
2946 my $options = $fw_conf->{ipset}->{$ipset};
2947
2948 # remove duplicates
2949 my $nethash = {};
2950 foreach my $entry (@$options) {
2951 next if $entry->{errors}; # skip entries with errors
2952 eval {
2953 my ($cidr, $ver);
2954 if ($entry->{cidr} =~ m/^${ip_alias_pattern}$/) {
2955 ($cidr, $ver) = resolve_alias($clusterfw_conf, $fw_conf, $entry->{cidr});
2956 } else {
2957 ($cidr, $ver) = parse_ip_or_cidr($entry->{cidr});
2958 }
2959 #http://backreference.org/2013/03/01/ipv6-address-normalization/
2960 if ($ver == 6) {
2961 $cidr = lc(Net::IP::ip_compress_address($cidr, 6));
2962 $cidr =~ s|/128$||;
2963 } else {
2964 $cidr =~ s|/32$||;
2965 }
2966
2967 $nethash->{$ver}->{$cidr} = { cidr => $cidr, nomatch => $entry->{nomatch} };
2968 };
2969 warn $@ if $@;
2970 }
2971
2972 foreach my $ipversion (4, 6) {
2973 my $data = $nethash->{$ipversion};
2974
2975 my $name = compute_ipset_chain_name($fw_conf->{vmid}, $ipset, $ipversion);
2976
2977 my $hashsize = scalar(@$options);
2978 if ($hashsize <= 64) {
2979 $hashsize = 64;
2980 } else {
2981 $hashsize = round_powerof2($hashsize);
2982 }
2983
2984 my $family = $ipversion == "6" ? "inet6" : "inet";
2985
2986 $ipset_ruleset->{$name} = ["create $name hash:net family $family hashsize $hashsize maxelem $hashsize"];
2987
2988 foreach my $cidr (sort keys %$data) {
2989 my $entry = $data->{$cidr};
2990
2991 my $cmd = "add $name $cidr";
2992 if ($entry->{nomatch}) {
2993 if ($feature_ipset_nomatch) {
2994 push @{$ipset_ruleset->{$name}}, "$cmd nomatch";
2995 } else {
2996 warn "ignore !$cidr - nomatch not supported by kernel\n";
2997 }
2998 } else {
2999 push @{$ipset_ruleset->{$name}}, $cmd;
3000 }
3001 }
3002 }
3003 }
3004 }
3005
3006 sub round_powerof2 {
3007 my ($int) = @_;
3008
3009 $int--;
3010 $int |= $int >> $_ foreach (1,2,4,8,16);
3011 return ++$int;
3012 }
3013
3014 sub load_clusterfw_conf {
3015 my ($filename, $verbose) = @_;
3016
3017 $filename = $clusterfw_conf_filename if !defined($filename);
3018
3019 my $cluster_conf = {};
3020 if (my $fh = IO::File->new($filename, O_RDONLY)) {
3021 $cluster_conf = parse_clusterfw_config($filename, $fh, $verbose);
3022 }
3023
3024 return $cluster_conf;
3025 }
3026
3027 sub save_clusterfw_conf {
3028 my ($cluster_conf) = @_;
3029
3030 my $raw = '';
3031
3032 my $options = $cluster_conf->{options};
3033 $raw .= &$format_options($options) if $options && scalar(keys %$options);
3034
3035 my $aliases = $cluster_conf->{aliases};
3036 $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3037
3038 $raw .= &$format_ipsets($cluster_conf) if $cluster_conf->{ipset};
3039
3040 my $rules = $cluster_conf->{rules};
3041 if ($rules && scalar(@$rules)) {
3042 $raw .= "[RULES]\n\n";
3043 $raw .= &$format_rules($rules, 1);
3044 $raw .= "\n";
3045 }
3046
3047 if ($cluster_conf->{groups}) {
3048 foreach my $group (sort keys %{$cluster_conf->{groups}}) {
3049 my $rules = $cluster_conf->{groups}->{$group};
3050 if (my $comment = $cluster_conf->{group_comments}->{$group}) {
3051 my $utf8comment = encode('utf8', $comment);
3052 $raw .= "[group $group] # $utf8comment\n\n";
3053 } else {
3054 $raw .= "[group $group]\n\n";
3055 }
3056
3057 $raw .= &$format_rules($rules, 0);
3058 $raw .= "\n";
3059 }
3060 }
3061
3062 mkdir $pvefw_conf_dir;
3063 PVE::Tools::file_set_contents($clusterfw_conf_filename, $raw);
3064 }
3065
3066 sub load_hostfw_conf {
3067 my ($cluster_conf, $filename, $verbose) = @_;
3068
3069 $filename = $hostfw_conf_filename if !defined($filename);
3070
3071 my $hostfw_conf = {};
3072 if (my $fh = IO::File->new($filename, O_RDONLY)) {
3073 $hostfw_conf = parse_hostfw_config($filename, $fh, $cluster_conf, $verbose);
3074 }
3075 return $hostfw_conf;
3076 }
3077
3078 sub save_hostfw_conf {
3079 my ($hostfw_conf) = @_;
3080
3081 my $raw = '';
3082
3083 my $options = $hostfw_conf->{options};
3084 $raw .= &$format_options($options) if $options && scalar(keys %$options);
3085
3086 my $rules = $hostfw_conf->{rules};
3087 if ($rules && scalar(@$rules)) {
3088 $raw .= "[RULES]\n\n";
3089 $raw .= &$format_rules($rules, 1);
3090 $raw .= "\n";
3091 }
3092
3093 PVE::Tools::file_set_contents($hostfw_conf_filename, $raw);
3094 }
3095
3096 sub compile {
3097 my ($cluster_conf, $hostfw_conf, $vmdata, $verbose) = @_;
3098
3099 my $vmfw_configs;
3100
3101 if ($vmdata) { # test mode
3102 my $testdir = $vmdata->{testdir} || die "no test directory specified";
3103 my $filename = "$testdir/cluster.fw";
3104 $cluster_conf = load_clusterfw_conf($filename, $verbose);
3105
3106 $filename = "$testdir/host.fw";
3107 $hostfw_conf = load_hostfw_conf($cluster_conf, $filename, $verbose);
3108
3109 $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, $testdir, $verbose);
3110 } else { # normal operation
3111 $cluster_conf = load_clusterfw_conf(undef, $verbose) if !$cluster_conf;
3112
3113 $hostfw_conf = load_hostfw_conf($cluster_conf, undef, $verbose) if !$hostfw_conf;
3114
3115 $vmdata = read_local_vm_config();
3116 $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, undef, $verbose);
3117 }
3118
3119 my ($ruleset, $ipset_ruleset) = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 4, $verbose);
3120 my ($rulesetv6) = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 6, $verbose);
3121
3122 return ($ruleset, $ipset_ruleset, $rulesetv6);
3123 }
3124
3125 sub compile_iptables_filter {
3126 my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $ipversion, $verbose) = @_;
3127
3128 $cluster_conf->{ipset}->{venet0} = [];
3129 my $venet0_ipset_chain = compute_ipset_chain_name(0, 'venet0', $ipversion);
3130
3131 my $localnet;
3132 if ($cluster_conf->{aliases}->{local_network}) {
3133 $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3134 } else {
3135 my $localnet_ver;
3136 ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3137
3138 $cluster_conf->{aliases}->{local_network} = {
3139 name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3140 }
3141
3142 push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3143
3144 return ({}, {}) if !$cluster_conf->{options}->{enable};
3145
3146 my $ruleset = {};
3147
3148 ruleset_create_chain($ruleset, "PVEFW-INPUT");
3149 ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
3150
3151 ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3152
3153 my $hostfw_options = $hostfw_conf->{options} || {};
3154
3155 # fixme: what log level should we use here?
3156 my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
3157
3158 ruleset_chain_add_conn_filters($ruleset, "PVEFW-FORWARD", "ACCEPT");
3159
3160
3161 ruleset_create_chain($ruleset, "PVEFW-VENET-OUT");
3162 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i venet0 -m set --match-set ${venet0_ipset_chain} src -j PVEFW-VENET-OUT");
3163 ruleset_addrule($ruleset, "PVEFW-INPUT", "-i venet0 -m set --match-set ${venet0_ipset_chain} src -j PVEFW-VENET-OUT");
3164
3165 ruleset_create_chain($ruleset, "PVEFW-FWBR-IN");
3166 ruleset_chain_add_input_filters($ruleset, "PVEFW-FWBR-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
3167
3168 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-in fwln+ -j PVEFW-FWBR-IN");
3169
3170 ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3171 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-out fwln+ -j PVEFW-FWBR-OUT");
3172
3173 ruleset_create_chain($ruleset, "PVEFW-VENET-IN");
3174 ruleset_chain_add_input_filters($ruleset, "PVEFW-VENET-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
3175
3176 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o venet0 -m set --match-set ${venet0_ipset_chain} dst -j PVEFW-VENET-IN");
3177
3178 generate_std_chains($ruleset, $hostfw_options, $ipversion);
3179
3180 my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
3181
3182 my $ipset_ruleset = {};
3183
3184 if ($hostfw_enable) {
3185 eval { enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf, $ipversion); };
3186 warn $@ if $@; # just to be sure - should not happen
3187 }
3188
3189 ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-o venet0 -m set --match-set ${venet0_ipset_chain} dst -j PVEFW-VENET-IN");
3190
3191 # generate firewall rules for QEMU VMs
3192 foreach my $vmid (keys %{$vmdata->{qemu}}) {
3193 eval {
3194 my $conf = $vmdata->{qemu}->{$vmid};
3195 my $vmfw_conf = $vmfw_configs->{$vmid};
3196 return if !$vmfw_conf;
3197
3198 generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf);
3199
3200 foreach my $netid (keys %$conf) {
3201 next if $netid !~ m/^net(\d+)$/;
3202 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3203 next if !$net->{firewall};
3204 my $iface = "tap${vmid}i$1";
3205
3206 my $macaddr = $net->{macaddr};
3207 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3208 $vmfw_conf, $vmid, 'IN', $ipversion);
3209 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3210 $vmfw_conf, $vmid, 'OUT', $ipversion);
3211 }
3212 };
3213 warn $@ if $@; # just to be sure - should not happen
3214 }
3215
3216 # generate firewall rules for OpenVZ containers
3217 foreach my $vmid (keys %{$vmdata->{openvz}}) {
3218 eval {
3219 my $conf = $vmdata->{openvz}->{$vmid};
3220
3221 my $vmfw_conf = $vmfw_configs->{$vmid};
3222 return if !$vmfw_conf;
3223
3224 generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf);
3225
3226 if ($vmfw_conf->{options}->{enable}) {
3227 if ($conf->{ip_address} && $conf->{ip_address}->{value}) {
3228 my $ip = $conf->{ip_address}->{value};
3229 $ip =~ s/\s+/,/g;
3230
3231 my @ips = ();
3232
3233 foreach my $singleip (split(',', $ip)) {
3234 my $singleip_ver = parse_address_list($singleip); # make sure we have a valid $ip list
3235 push @{$cluster_conf->{ipset}->{venet0}}, { cidr => $singleip };
3236 push @ips, $singleip if $singleip_ver == $ipversion;
3237 }
3238
3239 if (scalar(@ips)) {
3240 my $ip_list = join(',', @ips);
3241 generate_venet_rules_direction($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip_list, 'IN', $ipversion);
3242 generate_venet_rules_direction($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip_list, 'OUT', $ipversion);
3243 }
3244 }
3245 }
3246
3247 if ($conf->{netif} && $conf->{netif}->{value}) {
3248 my $netif = PVE::OpenVZ::parse_netif($conf->{netif}->{value});
3249 foreach my $netid (keys %$netif) {
3250 my $d = $netif->{$netid};
3251 my $bridge = $d->{bridge};
3252 next if !$bridge || $bridge !~ m/^vmbr\d+(v(\d+))?f$/; # firewall enabled ?
3253 my $macaddr = $d->{mac};
3254 my $iface = $d->{host_ifname};
3255 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3256 $vmfw_conf, $vmid, 'IN', $ipversion);
3257 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3258 $vmfw_conf, $vmid, 'OUT', $ipversion);
3259 }
3260 }
3261 };
3262 warn $@ if $@; # just to be sure - should not happen
3263 }
3264
3265 if(ruleset_chain_exist($ruleset, "PVEFW-IPS")){
3266 ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j PVEFW-IPS");
3267 }
3268
3269 generate_ipset_chains($ipset_ruleset, undef, $cluster_conf);
3270
3271 return ($ruleset, $ipset_ruleset);
3272 }
3273
3274 sub get_ruleset_status {
3275 my ($ruleset, $active_chains, $digest_fn, $verbose) = @_;
3276
3277 my $statushash = {};
3278
3279 foreach my $chain (sort keys %$ruleset) {
3280 my $sig = &$digest_fn($ruleset->{$chain});
3281
3282 $statushash->{$chain}->{sig} = $sig;
3283
3284 my $oldsig = $active_chains->{$chain};
3285 if (!defined($oldsig)) {
3286 $statushash->{$chain}->{action} = 'create';
3287 } else {
3288 if ($oldsig eq $sig) {
3289 $statushash->{$chain}->{action} = 'exists';
3290 } else {
3291 $statushash->{$chain}->{action} = 'update';
3292 }
3293 }
3294 print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
3295 foreach my $cmd (@{$ruleset->{$chain}}) {
3296 print "\t$cmd\n" if $verbose;
3297 }
3298 }
3299
3300 foreach my $chain (sort keys %$active_chains) {
3301 if (!defined($ruleset->{$chain})) {
3302 my $sig = $active_chains->{$chain};
3303 $statushash->{$chain}->{action} = 'delete';
3304 $statushash->{$chain}->{sig} = $sig;
3305 print "delete $chain ($sig)\n" if $verbose;
3306 }
3307 }
3308
3309 return $statushash;
3310 }
3311
3312 sub print_sig_rule {
3313 my ($chain, $sig) = @_;
3314
3315 # We just use this to store a SHA1 checksum used to detect changes
3316 return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
3317 }
3318
3319 sub get_ruleset_cmdlist {
3320 my ($ruleset, $verbose, $iptablescmd) = @_;
3321
3322 my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
3323
3324 my ($active_chains, $hooks) = iptables_get_chains($iptablescmd);
3325 my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, $verbose);
3326
3327 # create missing chains first
3328 foreach my $chain (sort keys %$ruleset) {
3329 my $stat = $statushash->{$chain};
3330 die "internal error" if !$stat;
3331 next if $stat->{action} ne 'create';
3332
3333 $cmdlist .= ":$chain - [0:0]\n";
3334 }
3335
3336 foreach my $h (qw(INPUT OUTPUT FORWARD)) {
3337 my $chain = "PVEFW-$h";
3338 if ($ruleset->{$chain} && !$hooks->{$h}) {
3339 $cmdlist .= "-A $h -j $chain\n";
3340 }
3341 }
3342
3343 foreach my $chain (sort keys %$ruleset) {
3344 my $stat = $statushash->{$chain};
3345 die "internal error" if !$stat;
3346
3347 if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
3348 $cmdlist .= "-F $chain\n";
3349 foreach my $cmd (@{$ruleset->{$chain}}) {
3350 $cmdlist .= "$cmd\n";
3351 }
3352 $cmdlist .= print_sig_rule($chain, $stat->{sig});
3353 } elsif ($stat->{action} eq 'delete') {
3354 die "internal error"; # this should not happen
3355 } elsif ($stat->{action} eq 'exists') {
3356 # do nothing
3357 } else {
3358 die "internal error - unknown status '$stat->{action}'";
3359 }
3360 }
3361
3362 foreach my $chain (keys %$statushash) {
3363 next if $statushash->{$chain}->{action} ne 'delete';
3364 $cmdlist .= "-F $chain\n";
3365 }
3366 foreach my $chain (keys %$statushash) {
3367 next if $statushash->{$chain}->{action} ne 'delete';
3368 next if $chain eq 'PVEFW-INPUT';
3369 next if $chain eq 'PVEFW-OUTPUT';
3370 next if $chain eq 'PVEFW-FORWARD';
3371 $cmdlist .= "-X $chain\n";
3372 }
3373
3374 my $changes = $cmdlist ne "*filter\n" ? 1 : 0;
3375
3376 $cmdlist .= "COMMIT\n";
3377
3378 return wantarray ? ($cmdlist, $changes) : $cmdlist;
3379 }
3380
3381 sub get_ipset_cmdlist {
3382 my ($ruleset, $verbose) = @_;
3383
3384 my $cmdlist = "";
3385
3386 my $delete_cmdlist = "";
3387
3388 my $active_chains = ipset_get_chains();
3389 my $statushash = get_ruleset_status($ruleset, $active_chains, \&ipset_chain_digest, $verbose);
3390
3391 # remove stale _swap chains
3392 foreach my $chain (keys %$active_chains) {
3393 if ($chain =~ m/^PVEFW-\S+_swap$/) {
3394 $cmdlist .= "destroy $chain\n";
3395 }
3396 }
3397
3398 foreach my $chain (keys %$ruleset) {
3399 my $stat = $statushash->{$chain};
3400 die "internal error" if !$stat;
3401
3402 if ($stat->{action} eq 'create') {
3403 foreach my $cmd (@{$ruleset->{$chain}}) {
3404 $cmdlist .= "$cmd\n";
3405 }
3406 }
3407 }
3408
3409 foreach my $chain (keys %$ruleset) {
3410 my $stat = $statushash->{$chain};
3411 die "internal error" if !$stat;
3412
3413 if ($stat->{action} eq 'update') {
3414 my $chain_swap = $chain."_swap";
3415
3416 foreach my $cmd (@{$ruleset->{$chain}}) {
3417 $cmd =~ s/$chain/$chain_swap/;
3418 $cmdlist .= "$cmd\n";
3419 }
3420 $cmdlist .= "swap $chain_swap $chain\n";
3421 $cmdlist .= "flush $chain_swap\n";
3422 $cmdlist .= "destroy $chain_swap\n";
3423 }
3424 }
3425
3426 # the remove unused chains
3427 foreach my $chain (keys %$statushash) {
3428 next if $statushash->{$chain}->{action} ne 'delete';
3429
3430 $delete_cmdlist .= "flush $chain\n";
3431 $delete_cmdlist .= "destroy $chain\n";
3432 }
3433
3434 my $changes = ($cmdlist || $delete_cmdlist) ? 1 : 0;
3435
3436 return ($cmdlist, $delete_cmdlist, $changes);
3437 }
3438
3439 sub apply_ruleset {
3440 my ($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $verbose) = @_;
3441
3442 enable_bridge_firewall();
3443
3444 my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
3445 get_ipset_cmdlist($ipset_ruleset, undef, $verbose);
3446
3447 my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset, $verbose);
3448 my ($cmdlistv6, $changesv6) = get_ruleset_cmdlist($rulesetv6, $verbose, "ip6tables");
3449
3450 if ($verbose) {
3451 if ($ipset_changes) {
3452 print "ipset changes:\n";
3453 print $ipset_create_cmdlist if $ipset_create_cmdlist;
3454 print $ipset_delete_cmdlist if $ipset_delete_cmdlist;
3455 }
3456
3457 if ($changes) {
3458 print "iptables changes:\n";
3459 print $cmdlist;
3460 }
3461
3462 if ($changesv6) {
3463 print "ip6tables changes:\n";
3464 print $cmdlistv6;
3465 }
3466 }
3467
3468 my $tmpfile = "$pve_fw_status_dir/ipsetcmdlist1";
3469 PVE::Tools::file_set_contents($tmpfile, $ipset_create_cmdlist || '');
3470
3471 ipset_restore_cmdlist($ipset_create_cmdlist);
3472
3473 $tmpfile = "$pve_fw_status_dir/ip4cmdlist";
3474 PVE::Tools::file_set_contents($tmpfile, $cmdlist || '');
3475
3476 iptables_restore_cmdlist($cmdlist);
3477
3478 $tmpfile = "$pve_fw_status_dir/ip6cmdlist";
3479 PVE::Tools::file_set_contents($tmpfile, $cmdlistv6 || '');
3480
3481 ip6tables_restore_cmdlist($cmdlistv6);
3482
3483 $tmpfile = "$pve_fw_status_dir/ipsetcmdlist2";
3484 PVE::Tools::file_set_contents($tmpfile, $ipset_delete_cmdlist || '');
3485
3486 ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
3487
3488 # test: re-read status and check if everything is up to date
3489 my $active_chains = iptables_get_chains();
3490 my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, 0);
3491
3492 my $errors;
3493 foreach my $chain (sort keys %$ruleset) {
3494 my $stat = $statushash->{$chain};
3495 if ($stat->{action} ne 'exists') {
3496 warn "unable to update chain '$chain'\n";
3497 $errors = 1;
3498 }
3499 }
3500
3501 my $active_chainsv6 = iptables_get_chains("ip6tables");
3502 my $statushashv6 = get_ruleset_status($rulesetv6, $active_chainsv6, \&iptables_chain_digest, 0);
3503
3504 foreach my $chain (sort keys %$rulesetv6) {
3505 my $stat = $statushashv6->{$chain};
3506 if ($stat->{action} ne 'exists') {
3507 warn "unable to update chain '$chain'\n";
3508 $errors = 1;
3509 }
3510 }
3511
3512 die "unable to apply firewall changes\n" if $errors;
3513
3514 update_nf_conntrack_max($hostfw_conf);
3515
3516 update_nf_conntrack_tcp_timeout_established($hostfw_conf);
3517
3518 }
3519
3520 sub update_nf_conntrack_max {
3521 my ($hostfw_conf) = @_;
3522
3523 my $max = 65536; # reasonable default
3524
3525 my $options = $hostfw_conf->{options} || {};
3526
3527 if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
3528 $max = $options->{nf_conntrack_max};
3529 $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
3530 }
3531
3532 my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
3533 my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
3534
3535 my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
3536
3537 if ($current != $max) {
3538 my $hashsize = int($max/4);
3539 PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
3540 PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
3541 }
3542 }
3543
3544 sub update_nf_conntrack_tcp_timeout_established {
3545 my ($hostfw_conf) = @_;
3546
3547 my $options = $hostfw_conf->{options} || {};
3548
3549 my $value = defined($options->{nf_conntrack_tcp_timeout_established}) ? $options->{nf_conntrack_tcp_timeout_established} : 432000;
3550
3551 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established", $value);
3552 }
3553
3554 sub remove_pvefw_chains {
3555
3556 PVE::Firewall::remove_pvefw_chains_iptables("iptables");
3557 PVE::Firewall::remove_pvefw_chains_iptables("ip6tables");
3558 PVE::Firewall::remove_pvefw_chains_ipset();
3559
3560 }
3561
3562 sub remove_pvefw_chains_iptables {
3563 my ($iptablescmd) = @_;
3564
3565 my ($chash, $hooks) = iptables_get_chains($iptablescmd);
3566 my $cmdlist = "*filter\n";
3567
3568 foreach my $h (qw(INPUT OUTPUT FORWARD)) {
3569 if ($hooks->{$h}) {
3570 $cmdlist .= "-D $h -j PVEFW-$h\n";
3571 }
3572 }
3573
3574 foreach my $chain (keys %$chash) {
3575 $cmdlist .= "-F $chain\n";
3576 }
3577
3578 foreach my $chain (keys %$chash) {
3579 $cmdlist .= "-X $chain\n";
3580 }
3581 $cmdlist .= "COMMIT\n";
3582
3583 if($iptablescmd eq "ip6tables") {
3584 ip6tables_restore_cmdlist($cmdlist);
3585 } else {
3586 iptables_restore_cmdlist($cmdlist);
3587 }
3588 }
3589
3590 sub remove_pvefw_chains_ipset {
3591
3592 my $ipset_chains = ipset_get_chains();
3593
3594 my $cmdlist = "";
3595
3596 foreach my $chain (keys %$ipset_chains) {
3597 $cmdlist .= "flush $chain\n";
3598 $cmdlist .= "destroy $chain\n";
3599 }
3600
3601 ipset_restore_cmdlist($cmdlist) if $cmdlist;
3602 }
3603
3604 sub init {
3605 my $cluster_conf = load_clusterfw_conf();
3606 my $cluster_options = $cluster_conf->{options};
3607 my $enable = $cluster_options->{enable};
3608
3609 return if !$enable;
3610
3611 # load required modules here
3612 }
3613
3614 sub update {
3615 my $code = sub {
3616
3617 my $cluster_conf = load_clusterfw_conf();
3618 my $cluster_options = $cluster_conf->{options};
3619
3620 if (!$cluster_options->{enable}) {
3621 PVE::Firewall::remove_pvefw_chains();
3622 return;
3623 }
3624
3625 my $hostfw_conf = load_hostfw_conf($cluster_conf);
3626
3627 my ($ruleset, $ipset_ruleset, $rulesetv6) = compile($cluster_conf, $hostfw_conf);
3628
3629 apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6);
3630 };
3631
3632 run_locked($code);
3633 }
3634
3635 1;
Firewall test scripts