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ip6tables accepts both spellings of the word neighbor
[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 use Data::Dumper;
117
118 my $nodename = PVE::INotify::nodename();
119
120 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
121
122 my $default_log_level = 'nolog'; # avoid logs by default
123
124 my $log_level_hash = {
125 debug => 7,
126 info => 6,
127 notice => 5,
128 warning => 4,
129 err => 3,
130 crit => 2,
131 alert => 1,
132 emerg => 0,
133 };
134
135 # we need to overwrite some macros for ipv6
136 my $pve_ipv6fw_macros = {
137 'Ping' => [
138 { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
139 ],
140 'NeighborDiscovery' => [
141 "IPv6 neighbor solicitation, neighbor and router advertisement",
142 { action => 'PARAM', proto => 'icmpv6', dport => 'router-advertisement' },
143 { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-solicitation' },
144 { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-advertisement' },
145 ],
146 'DHCPv6' => [
147 { action => 'PARAM', proto => 'udp', dport => '546:547', sport => '546:547' },
148 ],
149 'Trcrt' => [
150 { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
151 { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
152 ],
153 };
154
155 # imported/converted from: /usr/share/shorewall/macro.*
156 my $pve_fw_macros = {
157 'Amanda' => [
158 "Amanda Backup",
159 { action => 'PARAM', proto => 'udp', dport => '10080' },
160 { action => 'PARAM', proto => 'tcp', dport => '10080' },
161 ],
162 'Auth' => [
163 "Auth (identd) traffic",
164 { action => 'PARAM', proto => 'tcp', dport => '113' },
165 ],
166 'BGP' => [
167 "Border Gateway Protocol traffic",
168 { action => 'PARAM', proto => 'tcp', dport => '179' },
169 ],
170 'BitTorrent' => [
171 "BitTorrent traffic for BitTorrent 3.1 and earlier",
172 { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
173 { action => 'PARAM', proto => 'udp', dport => '6881' },
174 ],
175 'BitTorrent32' => [
176 "BitTorrent traffic for BitTorrent 3.2 and later",
177 { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
178 { action => 'PARAM', proto => 'udp', dport => '6881' },
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_preferred_macro_names = {};
510
511 my $pve_std_chains = {};
512 $pve_std_chains->{4} = {
513 'PVEFW-SET-ACCEPT-MARK' => [
514 "-j MARK --set-mark 1",
515 ],
516 'PVEFW-DropBroadcast' => [
517 # same as shorewall 'Broadcast'
518 # simply DROP BROADCAST/MULTICAST/ANYCAST
519 # we can use this to reduce logging
520 { action => 'DROP', dsttype => 'BROADCAST' },
521 { action => 'DROP', dsttype => 'MULTICAST' },
522 { action => 'DROP', dsttype => 'ANYCAST' },
523 { action => 'DROP', dest => '224.0.0.0/4' },
524 ],
525 'PVEFW-reject' => [
526 # same as shorewall 'reject'
527 { action => 'DROP', dsttype => 'BROADCAST' },
528 { action => 'DROP', source => '224.0.0.0/4' },
529 { action => 'DROP', proto => 'icmp' },
530 "-p tcp -j REJECT --reject-with tcp-reset",
531 "-p udp -j REJECT --reject-with icmp-port-unreachable",
532 "-p icmp -j REJECT --reject-with icmp-host-unreachable",
533 "-j REJECT --reject-with icmp-host-prohibited",
534 ],
535 'PVEFW-Drop' => [
536 # same as shorewall 'Drop', which is equal to DROP,
537 # but REJECT/DROP some packages to reduce logging,
538 # and ACCEPT critical ICMP types
539 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
540 # we are not interested in BROADCAST/MULTICAST/ANYCAST
541 { action => 'PVEFW-DropBroadcast' },
542 # ACCEPT critical ICMP types
543 { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
544 { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
545 # Drop packets with INVALID state
546 "-m conntrack --ctstate INVALID -j DROP",
547 # Drop Microsoft SMB noise
548 { action => 'DROP', proto => 'udp', dport => '135,445', nbdport => 2 },
549 { action => 'DROP', proto => 'udp', dport => '137:139'},
550 { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
551 { action => 'DROP', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
552 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
553 # Drop new/NotSyn traffic so that it doesn't get logged
554 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
555 # Drop DNS replies
556 { action => 'DROP', proto => 'udp', sport => 53 },
557 ],
558 'PVEFW-Reject' => [
559 # same as shorewall 'Reject', which is equal to Reject,
560 # but REJECT/DROP some packages to reduce logging,
561 # and ACCEPT critical ICMP types
562 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
563 # we are not interested in BROADCAST/MULTICAST/ANYCAST
564 { action => 'PVEFW-DropBroadcast' },
565 # ACCEPT critical ICMP types
566 { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
567 { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
568 # Drop packets with INVALID state
569 "-m conntrack --ctstate INVALID -j DROP",
570 # Drop Microsoft SMB noise
571 { action => 'PVEFW-reject', proto => 'udp', dport => '135,445', nbdport => 2 },
572 { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
573 { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
574 { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
575 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
576 # Drop new/NotSyn traffic so that it doesn't get logged
577 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
578 # Drop DNS replies
579 { action => 'DROP', proto => 'udp', sport => 53 },
580 ],
581 'PVEFW-tcpflags' => [
582 # same as shorewall tcpflags action.
583 # Packets arriving on this interface are checked for som illegal combinations of TCP flags
584 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
585 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
586 "-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
587 "-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
588 "-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
589 ],
590 'PVEFW-smurfs' => [
591 # same as shorewall smurfs action
592 # Filter packets for smurfs (packets with a broadcast address as the source).
593 "-s 0.0.0.0/32 -j RETURN",
594 "-m addrtype --src-type BROADCAST -g PVEFW-smurflog",
595 "-s 224.0.0.0/4 -g PVEFW-smurflog",
596 ],
597 };
598
599 $pve_std_chains->{6} = {
600 'PVEFW-SET-ACCEPT-MARK' => [
601 "-j MARK --set-mark 1",
602 ],
603 'PVEFW-DropBroadcast' => [
604 # same as shorewall 'Broadcast'
605 # simply DROP BROADCAST/MULTICAST/ANYCAST
606 # we can use this to reduce logging
607 #{ action => 'DROP', dsttype => 'BROADCAST' }, #no broadcast in ipv6
608 # ipv6 addrtype does not work with kernel 2.6.32
609 #{ action => 'DROP', dsttype => 'MULTICAST' },
610 #{ action => 'DROP', dsttype => 'ANYCAST' },
611 { action => 'DROP', dest => 'ff00::/8' },
612 #{ action => 'DROP', dest => '224.0.0.0/4' },
613 ],
614 'PVEFW-reject' => [
615 # same as shorewall 'reject'
616 #{ action => 'DROP', dsttype => 'BROADCAST' },
617 #{ action => 'DROP', source => '224.0.0.0/4' },
618 { action => 'DROP', proto => 'icmpv6' },
619 "-p tcp -j REJECT --reject-with tcp-reset",
620 #"-p udp -j REJECT --reject-with icmp-port-unreachable",
621 #"-p icmp -j REJECT --reject-with icmp-host-unreachable",
622 #"-j REJECT --reject-with icmp-host-prohibited",
623 ],
624 'PVEFW-Drop' => [
625 # same as shorewall 'Drop', which is equal to DROP,
626 # but REJECT/DROP some packages to reduce logging,
627 # and ACCEPT critical ICMP types
628 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
629 # we are not interested in BROADCAST/MULTICAST/ANYCAST
630 { action => 'PVEFW-DropBroadcast' },
631 # ACCEPT critical ICMP types
632 { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
633 { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
634 { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
635
636 # Drop packets with INVALID state
637 "-m conntrack --ctstate INVALID -j DROP",
638 # Drop Microsoft SMB noise
639 { action => 'DROP', proto => 'udp', dport => '135,445', nbdport => 2 },
640 { action => 'DROP', proto => 'udp', dport => '137:139'},
641 { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
642 { action => 'DROP', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
643 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
644 # Drop new/NotSyn traffic so that it doesn't get logged
645 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
646 # Drop DNS replies
647 { action => 'DROP', proto => 'udp', sport => 53 },
648 ],
649 'PVEFW-Reject' => [
650 # same as shorewall 'Reject', which is equal to Reject,
651 # but REJECT/DROP some packages to reduce logging,
652 # and ACCEPT critical ICMP types
653 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
654 # we are not interested in BROADCAST/MULTICAST/ANYCAST
655 { action => 'PVEFW-DropBroadcast' },
656 # ACCEPT critical ICMP types
657 { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
658 { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
659 { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
660
661 # Drop packets with INVALID state
662 "-m conntrack --ctstate INVALID -j DROP",
663 # Drop Microsoft SMB noise
664 { action => 'PVEFW-reject', proto => 'udp', dport => '135,445', nbdport => 2 },
665 { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
666 { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
667 { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
668 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
669 # Drop new/NotSyn traffic so that it doesn't get logged
670 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
671 # Drop DNS replies
672 { action => 'DROP', proto => 'udp', sport => 53 },
673 ],
674 'PVEFW-tcpflags' => [
675 # same as shorewall tcpflags action.
676 # Packets arriving on this interface are checked for som illegal combinations of TCP flags
677 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
678 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
679 "-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
680 "-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
681 "-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
682 ],
683 };
684
685 # iptables -p icmp -h
686 my $icmp_type_names = {
687 any => 1,
688 'echo-reply' => 1,
689 'destination-unreachable' => 1,
690 'network-unreachable' => 1,
691 'host-unreachable' => 1,
692 'protocol-unreachable' => 1,
693 'port-unreachable' => 1,
694 'fragmentation-needed' => 1,
695 'source-route-failed' => 1,
696 'network-unknown' => 1,
697 'host-unknown' => 1,
698 'network-prohibited' => 1,
699 'host-prohibited' => 1,
700 'TOS-network-unreachable' => 1,
701 'TOS-host-unreachable' => 1,
702 'communication-prohibited' => 1,
703 'host-precedence-violation' => 1,
704 'precedence-cutoff' => 1,
705 'source-quench' => 1,
706 'redirect' => 1,
707 'network-redirect' => 1,
708 'host-redirect' => 1,
709 'TOS-network-redirect' => 1,
710 'TOS-host-redirect' => 1,
711 'echo-request' => 1,
712 'router-advertisement' => 1,
713 'router-solicitation' => 1,
714 'time-exceeded' => 1,
715 'ttl-zero-during-transit' => 1,
716 'ttl-zero-during-reassembly' => 1,
717 'parameter-problem' => 1,
718 'ip-header-bad' => 1,
719 'required-option-missing' => 1,
720 'timestamp-request' => 1,
721 'timestamp-reply' => 1,
722 'address-mask-request' => 1,
723 'address-mask-reply' => 1,
724 };
725
726 # ip6tables -p icmpv6 -h
727
728 my $icmpv6_type_names = {
729 'any' => 1,
730 'destination-unreachable' => 1,
731 'no-route' => 1,
732 'communication-prohibited' => 1,
733 'address-unreachable' => 1,
734 'port-unreachable' => 1,
735 'packet-too-big' => 1,
736 'time-exceeded' => 1,
737 'ttl-zero-during-transit' => 1,
738 'ttl-zero-during-reassembly' => 1,
739 'parameter-problem' => 1,
740 'bad-header' => 1,
741 'unknown-header-type' => 1,
742 'unknown-option' => 1,
743 'echo-request' => 1,
744 'echo-reply' => 1,
745 'router-solicitation' => 1,
746 'router-advertisement' => 1,
747 'neighbor-solicitation' => 1,
748 'neighbour-solicitation' => 1,
749 'neighbor-advertisement' => 1,
750 'neighbour-advertisement' => 1,
751 'redirect' => 1,
752 };
753
754 sub init_firewall_macros {
755
756 $pve_fw_parsed_macros = {};
757
758 foreach my $k (keys %$pve_fw_macros) {
759 my $lc_name = lc($k);
760 my $macro = $pve_fw_macros->{$k};
761 if (!ref($macro->[0])) {
762 $pve_fw_macro_descr->{$k} = shift @$macro;
763 }
764 $pve_fw_preferred_macro_names->{$lc_name} = $k;
765 $pve_fw_parsed_macros->{$k} = $macro;
766 }
767 }
768
769 init_firewall_macros();
770
771 sub get_macros {
772 return wantarray ? ($pve_fw_parsed_macros, $pve_fw_macro_descr): $pve_fw_parsed_macros;
773 }
774
775 my $etc_services;
776
777 sub get_etc_services {
778
779 return $etc_services if $etc_services;
780
781 my $filename = "/etc/services";
782
783 my $fh = IO::File->new($filename, O_RDONLY);
784 if (!$fh) {
785 warn "unable to read '$filename' - $!\n";
786 return {};
787 }
788
789 my $services = {};
790
791 while (my $line = <$fh>) {
792 chomp ($line);
793 next if $line =~m/^#/;
794 next if ($line =~m/^\s*$/);
795
796 if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp).*$!) {
797 $services->{byid}->{$2}->{name} = $1;
798 $services->{byid}->{$2}->{port} = $2;
799 $services->{byid}->{$2}->{$3} = 1;
800 $services->{byname}->{$1} = $services->{byid}->{$2};
801 }
802 }
803
804 close($fh);
805
806 $etc_services = $services;
807
808
809 return $etc_services;
810 }
811
812 my $etc_protocols;
813
814 sub get_etc_protocols {
815 return $etc_protocols if $etc_protocols;
816
817 my $filename = "/etc/protocols";
818
819 my $fh = IO::File->new($filename, O_RDONLY);
820 if (!$fh) {
821 warn "unable to read '$filename' - $!\n";
822 return {};
823 }
824
825 my $protocols = {};
826
827 while (my $line = <$fh>) {
828 chomp ($line);
829 next if $line =~m/^#/;
830 next if ($line =~m/^\s*$/);
831
832 if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
833 $protocols->{byid}->{$2}->{name} = $1;
834 $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
835 }
836 }
837
838 close($fh);
839
840 # add special case for ICMP v6
841 $protocols->{byid}->{icmpv6}->{name} = "icmpv6";
842 $protocols->{byname}->{icmpv6} = $protocols->{byid}->{icmpv6};
843
844 $etc_protocols = $protocols;
845
846 return $etc_protocols;
847 }
848
849 my $ipv4_mask_hash_localnet = {
850 '255.255.0.0' => 16,
851 '255.255.128.0' => 17,
852 '255.255.192.0' => 18,
853 '255.255.224.0' => 19,
854 '255.255.240.0' => 20,
855 '255.255.248.0' => 21,
856 '255.255.252.0' => 22,
857 '255.255.254.0' => 23,
858 '255.255.255.0' => 24,
859 '255.255.255.128' => 25,
860 '255.255.255.192' => 26,
861 '255.255.255.224' => 27,
862 '255.255.255.240' => 28,
863 '255.255.255.248' => 29,
864 '255.255.255.252' => 30,
865 };
866
867 my $__local_network;
868
869 sub local_network {
870 my ($new_value) = @_;
871
872 $__local_network = $new_value if defined($new_value);
873
874 return $__local_network if defined($__local_network);
875
876 eval {
877 my $nodename = PVE::INotify::nodename();
878
879 my $ip = PVE::Cluster::remote_node_ip($nodename);
880
881 my $testip = Net::IP->new($ip);
882
883 my $routes = PVE::ProcFSTools::read_proc_net_route();
884 foreach my $entry (@$routes) {
885 my $mask = $ipv4_mask_hash_localnet->{$entry->{mask}};
886 next if !defined($mask);
887 return if $mask eq '0.0.0.0';
888 my $cidr = "$entry->{dest}/$mask";
889 my $testnet = Net::IP->new($cidr);
890 if ($testnet->overlaps($testip)) {
891 $__local_network = $cidr;
892 return;
893 }
894 }
895 };
896 warn $@ if $@;
897
898 return $__local_network;
899 }
900
901 # ipset names are limited to 31 characters,
902 # and we use '-v4' or '-v6' to indicate IP versions,
903 # and we use '_swap' suffix for atomic update,
904 # for example PVEFW-${VMID}-${ipset_name}_swap
905
906 my $max_iptables_ipset_name_length = 31 - length("PVEFW-") - length("_swap");
907
908 sub compute_ipset_chain_name {
909 my ($vmid, $ipset_name, $ipversion) = @_;
910
911 $vmid = 0 if !defined($vmid);
912
913 my $id = "$vmid-${ipset_name}-v$ipversion";
914
915 if (length($id) > $max_iptables_ipset_name_length) {
916 $id = PVE::Tools::fnv31a_hex($id);
917 }
918
919 return "PVEFW-$id";
920 }
921
922 sub compute_ipfilter_ipset_name {
923 my ($iface) = @_;
924
925 return "ipfilter-$iface";
926 }
927
928 sub parse_address_list {
929 my ($str) = @_;
930
931 if ($str =~ m/^(\+)(\S+)$/) { # ipset ref
932 die "ipset name too long\n" if length($str) > ($max_ipset_name_length + 1);
933 return;
934 }
935
936 if ($str =~ m/^${ip_alias_pattern}$/) {
937 die "alias name too long\n" if length($str) > $max_alias_name_length;
938 return;
939 }
940
941 my $count = 0;
942 my $iprange = 0;
943 my $ipversion;
944
945 foreach my $elem (split(/,/, $str)) {
946 $count++;
947 my $ip = Net::IP->new($elem);
948 if (!$ip) {
949 my $err = Net::IP::Error();
950 die "invalid IP address: $err\n";
951 }
952 $iprange = 1 if $elem =~ m/-/;
953
954 my $new_ipversion = Net::IP::ip_is_ipv6($ip->ip()) ? 6 : 4;
955
956 die "detected mixed ipv4/ipv6 addresses in address list '$str'\n"
957 if $ipversion && ($new_ipversion != $ipversion);
958
959 $ipversion = $new_ipversion;
960 }
961
962 die "you can't use a range in a list\n" if $iprange && $count > 1;
963
964 return $ipversion;
965 }
966
967 sub parse_port_name_number_or_range {
968 my ($str) = @_;
969
970 my $services = PVE::Firewall::get_etc_services();
971 my $count = 0;
972 my $icmp_port = 0;
973
974 foreach my $item (split(/,/, $str)) {
975 $count++;
976 if ($item =~ m/^(\d+):(\d+)$/) {
977 my ($port1, $port2) = ($1, $2);
978 die "invalid port '$port1'\n" if $port1 > 65535;
979 die "invalid port '$port2'\n" if $port2 > 65535;
980 } elsif ($item =~ m/^(\d+)$/) {
981 my $port = $1;
982 die "invalid port '$port'\n" if $port > 65535;
983 } else {
984 if ($icmp_type_names->{$item}) {
985 $icmp_port = 1;
986 } elsif ($icmpv6_type_names->{$item}) {
987 $icmp_port = 1;
988 } else {
989 die "invalid port '$item'\n" if !$services->{byname}->{$item};
990 }
991 }
992 }
993
994 die "ICPM ports not allowed in port range\n" if $icmp_port && $count > 1;
995
996 return $count;
997 }
998
999 PVE::JSONSchema::register_format('pve-fw-port-spec', \&pve_fw_verify_port_spec);
1000 sub pve_fw_verify_port_spec {
1001 my ($portstr) = @_;
1002
1003 parse_port_name_number_or_range($portstr);
1004
1005 return $portstr;
1006 }
1007
1008 PVE::JSONSchema::register_format('pve-fw-addr-spec', \&pve_fw_verify_addr_spec);
1009 sub pve_fw_verify_addr_spec {
1010 my ($list) = @_;
1011
1012 parse_address_list($list);
1013
1014 return $list;
1015 }
1016
1017 PVE::JSONSchema::register_format('pve-fw-protocol-spec', \&pve_fw_verify_protocol_spec);
1018 sub pve_fw_verify_protocol_spec {
1019 my ($proto) = @_;
1020
1021 my $protocols = get_etc_protocols();
1022
1023 die "unknown protocol '$proto'\n" if $proto &&
1024 !(defined($protocols->{byname}->{$proto}) ||
1025 defined($protocols->{byid}->{$proto}));
1026
1027 return $proto;
1028 }
1029
1030
1031 # helper function for API
1032
1033 sub copy_opject_with_digest {
1034 my ($object) = @_;
1035
1036 my $sha = Digest::SHA->new('sha1');
1037
1038 my $res = {};
1039 foreach my $k (sort keys %$object) {
1040 my $v = $object->{$k};
1041 next if !defined($v);
1042 $res->{$k} = $v;
1043 $sha->add($k, ':', $v, "\n");
1044 }
1045
1046 my $digest = $sha->hexdigest;
1047
1048 $res->{digest} = $digest;
1049
1050 return wantarray ? ($res, $digest) : $res;
1051 }
1052
1053 sub copy_list_with_digest {
1054 my ($list) = @_;
1055
1056 my $sha = Digest::SHA->new('sha1');
1057
1058 my $res = [];
1059 foreach my $entry (@$list) {
1060 my $data = {};
1061 foreach my $k (sort keys %$entry) {
1062 my $v = $entry->{$k};
1063 next if !defined($v);
1064 $data->{$k} = $v;
1065 # Note: digest ignores refs ($rule->{errors})
1066 $sha->add($k, ':', $v, "\n") if !ref($v); ;
1067 }
1068 push @$res, $data;
1069 }
1070
1071 my $digest = $sha->hexdigest;
1072
1073 foreach my $entry (@$res) {
1074 $entry->{digest} = $digest;
1075 }
1076
1077 return wantarray ? ($res, $digest) : $res;
1078 }
1079
1080 my $rule_properties = {
1081 pos => {
1082 description => "Update rule at position <pos>.",
1083 type => 'integer',
1084 minimum => 0,
1085 optional => 1,
1086 },
1087 digest => get_standard_option('pve-config-digest'),
1088 type => {
1089 type => 'string',
1090 optional => 1,
1091 enum => ['in', 'out', 'group'],
1092 },
1093 action => {
1094 description => "Rule action ('ACCEPT', 'DROP', 'REJECT') or security group name.",
1095 type => 'string',
1096 optional => 1,
1097 pattern => $security_group_name_pattern,
1098 maxLength => 20,
1099 minLength => 2,
1100 },
1101 macro => {
1102 type => 'string',
1103 optional => 1,
1104 maxLength => 128,
1105 },
1106 iface => get_standard_option('pve-iface', { optional => 1 }),
1107 source => {
1108 type => 'string', format => 'pve-fw-addr-spec',
1109 optional => 1,
1110 },
1111 dest => {
1112 type => 'string', format => 'pve-fw-addr-spec',
1113 optional => 1,
1114 },
1115 proto => {
1116 type => 'string', format => 'pve-fw-protocol-spec',
1117 optional => 1,
1118 },
1119 enable => {
1120 type => 'boolean',
1121 optional => 1,
1122 },
1123 sport => {
1124 type => 'string', format => 'pve-fw-port-spec',
1125 optional => 1,
1126 },
1127 dport => {
1128 type => 'string', format => 'pve-fw-port-spec',
1129 optional => 1,
1130 },
1131 comment => {
1132 type => 'string',
1133 optional => 1,
1134 },
1135 };
1136
1137 sub add_rule_properties {
1138 my ($properties) = @_;
1139
1140 foreach my $k (keys %$rule_properties) {
1141 my $h = $rule_properties->{$k};
1142 # copy data, so that we can modify later without side effects
1143 foreach my $opt (keys %$h) { $properties->{$k}->{$opt} = $h->{$opt}; }
1144 }
1145
1146 return $properties;
1147 }
1148
1149 sub delete_rule_properties {
1150 my ($rule, $delete_str) = @_;
1151
1152 foreach my $opt (PVE::Tools::split_list($delete_str)) {
1153 raise_param_exc({ 'delete' => "no such property ('$opt')"})
1154 if !defined($rule_properties->{$opt});
1155 raise_param_exc({ 'delete' => "unable to delete required property '$opt'"})
1156 if $opt eq 'type' || $opt eq 'action';
1157 delete $rule->{$opt};
1158 }
1159
1160 return $rule;
1161 }
1162
1163 my $apply_macro = sub {
1164 my ($macro_name, $param, $verify, $ipversion) = @_;
1165
1166 my $macro_rules = $pve_fw_parsed_macros->{$macro_name};
1167 die "unknown macro '$macro_name'\n" if !$macro_rules; # should not happen
1168
1169 if ($ipversion && ($ipversion == 6) && $pve_ipv6fw_macros->{$macro_name}) {
1170 $macro_rules = $pve_ipv6fw_macros->{$macro_name};
1171 }
1172
1173 my $rules = [];
1174
1175 foreach my $templ (@$macro_rules) {
1176 my $rule = {};
1177 my $param_used = {};
1178 foreach my $k (keys %$templ) {
1179 my $v = $templ->{$k};
1180 if ($v eq 'PARAM') {
1181 $v = $param->{$k};
1182 $param_used->{$k} = 1;
1183 } elsif ($v eq 'DEST') {
1184 $v = $param->{dest};
1185 $param_used->{dest} = 1;
1186 } elsif ($v eq 'SOURCE') {
1187 $v = $param->{source};
1188 $param_used->{source} = 1;
1189 }
1190
1191 if (!defined($v)) {
1192 my $msg = "missing parameter '$k' in macro '$macro_name'";
1193 raise_param_exc({ macro => $msg }) if $verify;
1194 die "$msg\n";
1195 }
1196 $rule->{$k} = $v;
1197 }
1198 foreach my $k (keys %$param) {
1199 next if $k eq 'macro';
1200 next if !defined($param->{$k});
1201 next if $param_used->{$k};
1202 if (defined($rule->{$k})) {
1203 if ($rule->{$k} ne $param->{$k}) {
1204 my $msg = "parameter '$k' already define in macro (value = '$rule->{$k}')";
1205 raise_param_exc({ $k => $msg }) if $verify;
1206 die "$msg\n";
1207 }
1208 } else {
1209 $rule->{$k} = $param->{$k};
1210 }
1211 }
1212 push @$rules, $rule;
1213 }
1214
1215 return $rules;
1216 };
1217
1218 my $rule_env_iface_lookup = {
1219 'ct' => 1,
1220 'vm' => 1,
1221 'group' => 0,
1222 'cluster' => 1,
1223 'host' => 1,
1224 };
1225
1226 sub verify_rule {
1227 my ($rule, $cluster_conf, $fw_conf, $rule_env, $noerr) = @_;
1228
1229 my $allow_groups = $rule_env eq 'group' ? 0 : 1;
1230
1231 my $allow_iface = $rule_env_iface_lookup->{$rule_env};
1232 die "unknown rule_env '$rule_env'\n" if !defined($allow_iface); # should not happen
1233
1234 my $errors = $rule->{errors} || {};
1235
1236 my $error_count = 0;
1237
1238 my $add_error = sub {
1239 my ($param, $msg) = @_;
1240 chomp $msg;
1241 raise_param_exc({ $param => $msg }) if !$noerr;
1242 $error_count++;
1243 $errors->{$param} = $msg if !$errors->{$param};
1244 };
1245
1246 my $ipversion;
1247 my $set_ip_version = sub {
1248 my $vers = shift;
1249 if ($vers) {
1250 die "detected mixed ipv4/ipv6 adresses in rule\n"
1251 if $ipversion && ($vers != $ipversion);
1252 $ipversion = $vers;
1253 }
1254 };
1255
1256 my $check_ipset_or_alias_property = sub {
1257 my ($name, $expected_ipversion) = @_;
1258
1259 if (my $value = $rule->{$name}) {
1260 if ($value =~ m/^\+/) {
1261 if ($value =~ m/^\+(${ipset_name_pattern})$/) {
1262 &$add_error($name, "no such ipset '$1'")
1263 if !($cluster_conf->{ipset}->{$1} || ($fw_conf && $fw_conf->{ipset}->{$1}));
1264
1265 } else {
1266 &$add_error($name, "invalid ipset name '$value'");
1267 }
1268 } elsif ($value =~ m/^${ip_alias_pattern}$/){
1269 my $alias = lc($value);
1270 &$add_error($name, "no such alias '$value'")
1271 if !($cluster_conf->{aliases}->{$alias} || ($fw_conf && $fw_conf->{aliases}->{$alias}));
1272 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1273 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1274
1275 &$set_ip_version($e->{ipversion});
1276 }
1277 }
1278 };
1279
1280 my $type = $rule->{type};
1281 my $action = $rule->{action};
1282
1283 &$add_error('type', "missing property") if !$type;
1284 &$add_error('action', "missing property") if !$action;
1285
1286 if ($type) {
1287 if ($type eq 'in' || $type eq 'out') {
1288 &$add_error('action', "unknown action '$action'")
1289 if $action && ($action !~ m/^(ACCEPT|DROP|REJECT)$/);
1290 } elsif ($type eq 'group') {
1291 &$add_error('type', "security groups not allowed")
1292 if !$allow_groups;
1293 &$add_error('action', "invalid characters in security group name")
1294 if $action && ($action !~ m/^${security_group_name_pattern}$/);
1295 } else {
1296 &$add_error('type', "unknown rule type '$type'");
1297 }
1298 }
1299
1300 if ($rule->{iface}) {
1301 &$add_error('type', "parameter -i not allowed for this rule type")
1302 if !$allow_iface;
1303 eval { PVE::JSONSchema::pve_verify_iface($rule->{iface}); };
1304 &$add_error('iface', $@) if $@;
1305 if ($rule_env eq 'vm') {
1306 &$add_error('iface', "value does not match the regex pattern 'net\\d+'")
1307 if $rule->{iface} !~ m/^net(\d+)$/;
1308 } elsif ($rule_env eq 'ct') {
1309 &$add_error('iface', "value does not match the regex pattern '(venet|eth\\d+)'")
1310 if $rule->{iface} !~ m/^(venet|eth(\d+))$/;
1311 }
1312 }
1313
1314 if ($rule->{macro}) {
1315 if (my $preferred_name = $pve_fw_preferred_macro_names->{lc($rule->{macro})}) {
1316 $rule->{macro} = $preferred_name;
1317 } else {
1318 &$add_error('macro', "unknown macro '$rule->{macro}'");
1319 }
1320 }
1321
1322 if ($rule->{proto}) {
1323 eval { pve_fw_verify_protocol_spec($rule->{proto}); };
1324 &$add_error('proto', $@) if $@;
1325 &$set_ip_version(4) if $rule->{proto} eq 'icmp';
1326 &$set_ip_version(6) if $rule->{proto} eq 'icmpv6';
1327 }
1328
1329 if ($rule->{dport}) {
1330 eval { parse_port_name_number_or_range($rule->{dport}); };
1331 &$add_error('dport', $@) if $@;
1332 &$add_error('proto', "missing property - 'dport' requires this property")
1333 if !$rule->{proto};
1334 }
1335
1336 if ($rule->{sport}) {
1337 eval { parse_port_name_number_or_range($rule->{sport}); };
1338 &$add_error('sport', $@) if $@;
1339 &$add_error('proto', "missing property - 'sport' requires this property")
1340 if !$rule->{proto};
1341 }
1342
1343 if ($rule->{source}) {
1344 eval {
1345 my $source_ipversion = parse_address_list($rule->{source});
1346 &$set_ip_version($source_ipversion);
1347 };
1348 &$add_error('source', $@) if $@;
1349 &$check_ipset_or_alias_property('source', $ipversion);
1350 }
1351
1352 if ($rule->{dest}) {
1353 eval {
1354 my $dest_ipversion = parse_address_list($rule->{dest});
1355 &$set_ip_version($dest_ipversion);
1356 };
1357 &$add_error('dest', $@) if $@;
1358 &$check_ipset_or_alias_property('dest', $ipversion);
1359 }
1360
1361 $rule->{ipversion} = $ipversion if $ipversion;
1362
1363 if ($rule->{macro} && !$error_count) {
1364 eval { &$apply_macro($rule->{macro}, $rule, 1, $ipversion); };
1365 if (my $err = $@) {
1366 if (ref($err) eq "PVE::Exception" && $err->{errors}) {
1367 my $eh = $err->{errors};
1368 foreach my $p (keys %$eh) {
1369 &$add_error($p, $eh->{$p});
1370 }
1371 } else {
1372 &$add_error('macro', "$err");
1373 }
1374 }
1375 }
1376
1377 $rule->{errors} = $errors if $error_count;
1378
1379 return $rule;
1380 }
1381
1382 sub copy_rule_data {
1383 my ($rule, $param) = @_;
1384
1385 foreach my $k (keys %$rule_properties) {
1386 if (defined(my $v = $param->{$k})) {
1387 if ($v eq '' || $v eq '-') {
1388 delete $rule->{$k};
1389 } else {
1390 $rule->{$k} = $v;
1391 }
1392 }
1393 }
1394
1395 return $rule;
1396 }
1397
1398 sub rules_modify_permissions {
1399 my ($rule_env) = @_;
1400
1401 if ($rule_env eq 'host') {
1402 return {
1403 check => ['perm', '/nodes/{node}', [ 'Sys.Modify' ]],
1404 };
1405 } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1406 return {
1407 check => ['perm', '/', [ 'Sys.Modify' ]],
1408 };
1409 } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1410 return {
1411 check => ['perm', '/vms/{vmid}', [ 'VM.Config.Network' ]],
1412 }
1413 }
1414
1415 return undef;
1416 }
1417
1418 sub rules_audit_permissions {
1419 my ($rule_env) = @_;
1420
1421 if ($rule_env eq 'host') {
1422 return {
1423 check => ['perm', '/nodes/{node}', [ 'Sys.Audit' ]],
1424 };
1425 } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1426 return {
1427 check => ['perm', '/', [ 'Sys.Audit' ]],
1428 };
1429 } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1430 return {
1431 check => ['perm', '/vms/{vmid}', [ 'VM.Audit' ]],
1432 }
1433 }
1434
1435 return undef;
1436 }
1437
1438 # core functions
1439 my $bridge_firewall_enabled = 0;
1440
1441 sub enable_bridge_firewall {
1442
1443 return if $bridge_firewall_enabled; # only once
1444
1445 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
1446 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
1447
1448 # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
1449 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
1450
1451 $bridge_firewall_enabled = 1;
1452 }
1453
1454 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
1455
1456 sub iptables_restore_cmdlist {
1457 my ($cmdlist) = @_;
1458
1459 run_command("/sbin/iptables-restore -n", input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1460 }
1461
1462 sub ip6tables_restore_cmdlist {
1463 my ($cmdlist) = @_;
1464
1465 run_command("/sbin/ip6tables-restore -n", input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1466 }
1467
1468 sub ipset_restore_cmdlist {
1469 my ($cmdlist) = @_;
1470
1471 run_command("/usr/sbin/ipset restore", input => $cmdlist, errmsg => "ipset_restore_cmdlist");
1472 }
1473
1474 sub iptables_get_chains {
1475 my ($iptablescmd) = @_;
1476
1477 $iptablescmd = "iptables" if !$iptablescmd;
1478
1479 my $res = {};
1480
1481 # check what chains we want to track
1482 my $is_pvefw_chain = sub {
1483 my $name = shift;
1484
1485 return 1 if $name =~ m/^PVEFW-\S+$/;
1486
1487 return 1 if $name =~ m/^tap\d+i\d+-(:?IN|OUT)$/;
1488
1489 return 1 if $name =~ m/^veth\d+.\d+-(:?IN|OUT)$/; # fixme: dev name is configurable
1490
1491 return 1 if $name =~ m/^venet0-\d+-(:?IN|OUT)$/;
1492
1493 return 1 if $name =~ m/^fwbr\d+(v\d+)?-(:?FW|IN|OUT|IPS)$/;
1494 return 1 if $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/;
1495
1496 return undef;
1497 };
1498
1499 my $table = '';
1500
1501 my $hooks = {};
1502
1503 my $parser = sub {
1504 my $line = shift;
1505
1506 return if $line =~ m/^#/;
1507 return if $line =~ m/^\s*$/;
1508
1509 if ($line =~ m/^\*(\S+)$/) {
1510 $table = $1;
1511 return;
1512 }
1513
1514 return if $table ne 'filter';
1515
1516 if ($line =~ m/^:(\S+)\s/) {
1517 my $chain = $1;
1518 return if !&$is_pvefw_chain($chain);
1519 $res->{$chain} = "unknown";
1520 } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
1521 my ($chain, $sig) = ($1, $2);
1522 return if !&$is_pvefw_chain($chain);
1523 $res->{$chain} = $sig;
1524 } elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD)\s+-j\s+PVEFW-\1$/) {
1525 $hooks->{$1} = 1;
1526 } else {
1527 # simply ignore the rest
1528 return;
1529 }
1530 };
1531
1532 run_command("/sbin/$iptablescmd-save", outfunc => $parser);
1533
1534 return wantarray ? ($res, $hooks) : $res;
1535 }
1536
1537 sub iptables_chain_digest {
1538 my ($rules) = @_;
1539 my $digest = Digest::SHA->new('sha1');
1540 foreach my $rule (@$rules) { # order is important
1541 $digest->add($rule);
1542 }
1543 return $digest->b64digest;
1544 }
1545
1546 sub ipset_chain_digest {
1547 my ($rules) = @_;
1548
1549 my $digest = Digest::SHA->new('sha1');
1550 foreach my $rule (sort @$rules) { # note: sorted
1551 $digest->add($rule);
1552 }
1553 return $digest->b64digest;
1554 }
1555
1556 sub ipset_get_chains {
1557
1558 my $res = {};
1559 my $chains = {};
1560
1561 my $parser = sub {
1562 my $line = shift;
1563
1564 return if $line =~ m/^#/;
1565 return if $line =~ m/^\s*$/;
1566 if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
1567 my $chain = $1;
1568 $line =~ s/\s+$//; # delete trailing white space
1569 push @{$chains->{$chain}}, $line;
1570 } else {
1571 # simply ignore the rest
1572 return;
1573 }
1574 };
1575
1576 run_command("/usr/sbin/ipset save", outfunc => $parser);
1577
1578 # compute digest for each chain
1579 foreach my $chain (keys %$chains) {
1580 $res->{$chain} = ipset_chain_digest($chains->{$chain});
1581 }
1582
1583 return $res;
1584 }
1585
1586 sub ruleset_generate_cmdstr {
1587 my ($ruleset, $chain, $ipversion, $rule, $actions, $goto, $cluster_conf, $fw_conf) = @_;
1588
1589 return if defined($rule->{enable}) && !$rule->{enable};
1590 return if $rule->{errors};
1591
1592 die "unable to emit macro - internal error" if $rule->{macro}; # should not happen
1593
1594 my $nbdport = defined($rule->{dport}) ? parse_port_name_number_or_range($rule->{dport}) : 0;
1595 my $nbsport = defined($rule->{sport}) ? parse_port_name_number_or_range($rule->{sport}) : 0;
1596
1597 my @cmd = ();
1598
1599 push @cmd, "-i $rule->{iface_in}" if $rule->{iface_in};
1600 push @cmd, "-o $rule->{iface_out}" if $rule->{iface_out};
1601
1602 my $source = $rule->{source};
1603 my $dest = $rule->{dest};
1604
1605 if ($source) {
1606 if ($source =~ m/^\+/) {
1607 if ($source =~ m/^\+(${ipset_name_pattern})$/) {
1608 my $name = $1;
1609 if ($fw_conf && $fw_conf->{ipset}->{$name}) {
1610 my $ipset_chain = compute_ipset_chain_name($fw_conf->{vmid}, $name, $ipversion);
1611 push @cmd, "-m set --match-set ${ipset_chain} src";
1612 } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
1613 my $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
1614 push @cmd, "-m set --match-set ${ipset_chain} src";
1615 } else {
1616 die "no such ipset '$name'\n";
1617 }
1618 } else {
1619 die "invalid security group name '$source'\n";
1620 }
1621 } elsif ($source =~ m/^${ip_alias_pattern}$/){
1622 my $alias = lc($source);
1623 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1624 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1625 die "no such alias '$source'\n" if !$e;
1626 push @cmd, "-s $e->{cidr}";
1627 } elsif ($source =~ m/\-/){
1628 push @cmd, "-m iprange --src-range $source";
1629 } else {
1630 push @cmd, "-s $source";
1631 }
1632 }
1633
1634 if ($dest) {
1635 if ($dest =~ m/^\+/) {
1636 if ($dest =~ 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 ${ipset_chain} dst";
1641 } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
1642 my $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
1643 push @cmd, "-m set --match-set ${ipset_chain} dst";
1644 } else {
1645 die "no such ipset '$name'\n";
1646 }
1647 } else {
1648 die "invalid security group name '$dest'\n";
1649 }
1650 } elsif ($dest =~ m/^${ip_alias_pattern}$/){
1651 my $alias = lc($dest);
1652 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1653 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1654 die "no such alias '$dest'\n" if !$e;
1655 push @cmd, "-d $e->{cidr}";
1656 } elsif ($dest =~ m/^(\d+)\.(\d+).(\d+).(\d+)\-(\d+)\.(\d+).(\d+).(\d+)$/){
1657 push @cmd, "-m iprange --dst-range $dest";
1658 } else {
1659 push @cmd, "-d $dest";
1660 }
1661 }
1662
1663 if ($rule->{proto}) {
1664 push @cmd, "-p $rule->{proto}";
1665
1666 my $multiport = 0;
1667 $multiport++ if $nbdport > 1;
1668 $multiport++ if $nbsport > 1;
1669
1670 push @cmd, "--match multiport" if $multiport;
1671
1672 die "multiport: option '--sports' cannot be used together with '--dports'\n"
1673 if ($multiport == 2) && ($rule->{dport} ne $rule->{sport});
1674
1675 if ($rule->{dport}) {
1676 if ($rule->{proto} && $rule->{proto} eq 'icmp') {
1677 # Note: we use dport to store --icmp-type
1678 die "unknown icmp-type '$rule->{dport}'\n" if !defined($icmp_type_names->{$rule->{dport}});
1679 push @cmd, "-m icmp --icmp-type $rule->{dport}";
1680 } elsif ($rule->{proto} && $rule->{proto} eq 'icmpv6') {
1681 # Note: we use dport to store --icmpv6-type
1682 die "unknown icmpv6-type '$rule->{dport}'\n" if !defined($icmpv6_type_names->{$rule->{dport}});
1683 push @cmd, "-m icmpv6 --icmpv6-type $rule->{dport}";
1684 } else {
1685 if ($nbdport > 1) {
1686 if ($multiport == 2) {
1687 push @cmd, "--ports $rule->{dport}";
1688 } else {
1689 push @cmd, "--dports $rule->{dport}";
1690 }
1691 } else {
1692 push @cmd, "--dport $rule->{dport}";
1693 }
1694 }
1695 }
1696
1697 if ($rule->{sport}) {
1698 if ($nbsport > 1) {
1699 push @cmd, "--sports $rule->{sport}" if $multiport != 2;
1700 } else {
1701 push @cmd, "--sport $rule->{sport}";
1702 }
1703 }
1704 } elsif ($rule->{dport} || $rule->{sport}) {
1705 die "destination port '$rule->{dport}', but no protocol specified\n" if $rule->{dport};
1706 die "source port '$rule->{sport}', but no protocol specified\n" if $rule->{sport};
1707 }
1708
1709 push @cmd, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
1710
1711 if (my $action = $rule->{action}) {
1712 $action = $actions->{$action} if defined($actions->{$action});
1713 $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
1714 push @cmd, $goto ? "-g $action" : "-j $action";
1715 }
1716
1717 return scalar(@cmd) ? join(' ', @cmd) : undef;
1718 }
1719
1720 sub ruleset_generate_rule {
1721 my ($ruleset, $chain, $ipversion, $rule, $actions, $goto, $cluster_conf, $fw_conf) = @_;
1722
1723 my $rules;
1724
1725 if ($rule->{macro}) {
1726 $rules = &$apply_macro($rule->{macro}, $rule, 0, $ipversion);
1727 } else {
1728 $rules = [ $rule ];
1729 }
1730
1731 # update all or nothing
1732
1733 my @cmds = ();
1734 foreach my $tmp (@$rules) {
1735 if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $ipversion, $tmp, $actions, $goto, $cluster_conf, $fw_conf)) {
1736 push @cmds, $cmdstr;
1737 }
1738 }
1739
1740 foreach my $cmdstr (@cmds) {
1741 ruleset_addrule($ruleset, $chain, $cmdstr);
1742 }
1743 }
1744
1745 sub ruleset_generate_rule_insert {
1746 my ($ruleset, $chain, $ipversion, $rule, $actions, $goto) = @_;
1747
1748 die "implement me" if $rule->{macro}; # not implemented, because not needed so far
1749
1750 if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $ipversion, $rule, $actions, $goto)) {
1751 ruleset_insertrule($ruleset, $chain, $cmdstr);
1752 }
1753 }
1754
1755 sub ruleset_create_chain {
1756 my ($ruleset, $chain) = @_;
1757
1758 die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
1759 die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
1760
1761 die "chain '$chain' already exists\n" if $ruleset->{$chain};
1762
1763 $ruleset->{$chain} = [];
1764 }
1765
1766 sub ruleset_chain_exist {
1767 my ($ruleset, $chain) = @_;
1768
1769 return $ruleset->{$chain} ? 1 : undef;
1770 }
1771
1772 sub ruleset_addrule {
1773 my ($ruleset, $chain, $rule) = @_;
1774
1775 die "no such chain '$chain'\n" if !$ruleset->{$chain};
1776
1777 push @{$ruleset->{$chain}}, "-A $chain $rule";
1778 }
1779
1780 sub ruleset_insertrule {
1781 my ($ruleset, $chain, $rule) = @_;
1782
1783 die "no such chain '$chain'\n" if !$ruleset->{$chain};
1784
1785 unshift @{$ruleset->{$chain}}, "-A $chain $rule";
1786 }
1787
1788 sub get_log_rule_base {
1789 my ($chain, $vmid, $msg, $loglevel) = @_;
1790
1791 die "internal error - no log level" if !defined($loglevel);
1792
1793 $vmid = 0 if !defined($vmid);
1794
1795 # Note: we use special format for prefix to pass further
1796 # info to log daemon (VMID, LOGVELEL and CHAIN)
1797
1798 return "-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
1799 }
1800
1801 sub ruleset_addlog {
1802 my ($ruleset, $chain, $vmid, $msg, $loglevel, $rule) = @_;
1803
1804 return if !defined($loglevel);
1805
1806 my $logrule = get_log_rule_base($chain, $vmid, $msg, $loglevel);
1807
1808 $logrule = "$rule $logrule" if defined($rule);
1809
1810 ruleset_addrule($ruleset, $chain, $logrule);
1811 }
1812
1813 sub ruleset_add_chain_policy {
1814 my ($ruleset, $chain, $ipversion, $vmid, $policy, $loglevel, $accept_action) = @_;
1815
1816 if ($policy eq 'ACCEPT') {
1817
1818 ruleset_generate_rule($ruleset, $chain, $ipversion, { action => 'ACCEPT' },
1819 { ACCEPT => $accept_action});
1820
1821 } elsif ($policy eq 'DROP') {
1822
1823 ruleset_addrule($ruleset, $chain, "-j PVEFW-Drop");
1824
1825 ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
1826
1827 ruleset_addrule($ruleset, $chain, "-j DROP");
1828 } elsif ($policy eq 'REJECT') {
1829 ruleset_addrule($ruleset, $chain, "-j PVEFW-Reject");
1830
1831 ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
1832
1833 ruleset_addrule($ruleset, $chain, "-g PVEFW-reject");
1834 } else {
1835 # should not happen
1836 die "internal error: unknown policy '$policy'";
1837 }
1838 }
1839
1840 sub ruleset_chain_add_conn_filters {
1841 my ($ruleset, $chain, $accept) = @_;
1842
1843 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1844 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j $accept");
1845 }
1846
1847 sub ruleset_chain_add_input_filters {
1848 my ($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel) = @_;
1849
1850 if ($cluster_conf->{ipset}->{blacklist}){
1851 if (!ruleset_chain_exist($ruleset, "PVEFW-blacklist")) {
1852 ruleset_create_chain($ruleset, "PVEFW-blacklist");
1853 ruleset_addlog($ruleset, "PVEFW-blacklist", 0, "DROP: ", $loglevel) if $loglevel;
1854 ruleset_addrule($ruleset, "PVEFW-blacklist", "-j DROP");
1855 }
1856 my $ipset_chain = compute_ipset_chain_name(0, 'blacklist', $ipversion);
1857 ruleset_addrule($ruleset, $chain, "-m set --match-set ${ipset_chain} src -j PVEFW-blacklist");
1858 }
1859
1860 if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
1861 if ($ipversion == 4) {
1862 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
1863 }
1864 }
1865
1866 if ($options->{tcpflags}) {
1867 ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
1868 }
1869 }
1870
1871 sub ruleset_create_vm_chain {
1872 my ($ruleset, $chain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction) = @_;
1873
1874 ruleset_create_chain($ruleset, $chain);
1875 my $accept = generate_nfqueue($options);
1876
1877 if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
1878 if ($direction eq 'OUT') {
1879 ruleset_generate_rule($ruleset, $chain, $ipversion,
1880 { action => 'PVEFW-SET-ACCEPT-MARK',
1881 proto => 'udp', sport => 68, dport => 67 });
1882 } else {
1883 ruleset_generate_rule($ruleset, $chain, $ipversion,
1884 { action => 'ACCEPT',
1885 proto => 'udp', sport => 67, dport => 68 });
1886 }
1887 }
1888
1889 if ($direction eq 'OUT') {
1890 if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
1891 ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr -j DROP");
1892 }
1893 if ($ipfilter_ipset) {
1894 ruleset_addrule($ruleset, $chain, "-m set ! --match-set $ipfilter_ipset src -j DROP");
1895 }
1896 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1897 }
1898 }
1899
1900 sub ruleset_add_group_rule {
1901 my ($ruleset, $cluster_conf, $chain, $rule, $direction, $action, $ipversion) = @_;
1902
1903 my $group = $rule->{action};
1904 my $group_chain = "GROUP-$group-$direction";
1905 if(!ruleset_chain_exist($ruleset, $group_chain)){
1906 generate_group_rules($ruleset, $cluster_conf, $group, $ipversion);
1907 }
1908
1909 if ($direction eq 'OUT' && $rule->{iface_out}) {
1910 ruleset_addrule($ruleset, $chain, "-o $rule->{iface_out} -j $group_chain");
1911 } elsif ($direction eq 'IN' && $rule->{iface_in}) {
1912 ruleset_addrule($ruleset, $chain, "-i $rule->{iface_in} -j $group_chain");
1913 } else {
1914 ruleset_addrule($ruleset, $chain, "-j $group_chain");
1915 }
1916
1917 ruleset_addrule($ruleset, $chain, "-m mark --mark 1 -j $action");
1918 }
1919
1920 sub ruleset_generate_vm_rules {
1921 my ($ruleset, $rules, $cluster_conf, $vmfw_conf, $chain, $netid, $direction, $options, $ipversion) = @_;
1922
1923 my $lc_direction = lc($direction);
1924
1925 my $in_accept = generate_nfqueue($options);
1926
1927 foreach my $rule (@$rules) {
1928 next if $rule->{iface} && $rule->{iface} ne $netid;
1929 next if !$rule->{enable} || $rule->{errors};
1930 next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
1931
1932 if ($rule->{type} eq 'group') {
1933 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, $direction,
1934 $direction eq 'OUT' ? 'RETURN' : $in_accept, $ipversion);
1935 } else {
1936 next if $rule->{type} ne $lc_direction;
1937 eval {
1938 if ($direction eq 'OUT') {
1939 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
1940 { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" },
1941 undef, $cluster_conf, $vmfw_conf);
1942 } else {
1943 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
1944 { ACCEPT => $in_accept , REJECT => "PVEFW-reject" },
1945 undef, $cluster_conf, $vmfw_conf);
1946 }
1947 };
1948 warn $@ if $@;
1949 }
1950 }
1951 }
1952
1953 sub generate_nfqueue {
1954 my ($options) = @_;
1955
1956 if ($options->{ips}) {
1957 my $action = "NFQUEUE";
1958 if ($options->{ips_queues} && $options->{ips_queues} =~ m/^(\d+)(:(\d+))?$/) {
1959 if (defined($3) && defined($1)) {
1960 $action .= " --queue-balance $1:$3";
1961 } elsif (defined($1)) {
1962 $action .= " --queue-num $1";
1963 }
1964 }
1965 $action .= " --queue-bypass" if $feature_ipset_nomatch; #need kernel 3.10
1966 return $action;
1967 } else {
1968 return "ACCEPT";
1969 }
1970 }
1971
1972 sub ruleset_generate_vm_ipsrules {
1973 my ($ruleset, $options, $direction, $iface) = @_;
1974
1975 if ($options->{ips} && $direction eq 'IN') {
1976 my $nfqueue = generate_nfqueue($options);
1977
1978 if (!ruleset_chain_exist($ruleset, "PVEFW-IPS")) {
1979 ruleset_create_chain($ruleset, "PVEFW-IPS");
1980 }
1981
1982 ruleset_addrule($ruleset, "PVEFW-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged -j $nfqueue");
1983 }
1984 }
1985
1986 sub generate_venet_rules_direction {
1987 my ($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip, $direction, $ipversion) = @_;
1988
1989 my $lc_direction = lc($direction);
1990
1991 my $rules = $vmfw_conf->{rules};
1992
1993 my $options = $vmfw_conf->{options};
1994 my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
1995
1996 my $chain = "venet0-$vmid-$direction";
1997
1998 ruleset_create_vm_chain($ruleset, $chain, $ipversion, $options, undef, undef, $direction);
1999
2000 ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $chain, 'venet', $direction, undef, $ipversion);
2001
2002 # implement policy
2003 my $policy;
2004
2005 if ($direction eq 'OUT') {
2006 $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
2007 } else {
2008 $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
2009 }
2010
2011 my $accept = generate_nfqueue($options);
2012 my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
2013 ruleset_add_chain_policy($ruleset, $chain, $ipversion, $vmid, $policy, $loglevel, $accept_action);
2014
2015 if ($direction eq 'OUT') {
2016 ruleset_generate_rule_insert($ruleset, "PVEFW-VENET-OUT", $ipversion, {
2017 action => $chain,
2018 source => $ip,
2019 iface_in => 'venet0'});
2020 } else {
2021 ruleset_generate_rule($ruleset, "PVEFW-VENET-IN", $ipversion, {
2022 action => $chain,
2023 dest => $ip,
2024 iface_out => 'venet0'});
2025 }
2026 }
2027
2028 sub generate_tap_rules_direction {
2029 my ($ruleset, $cluster_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $direction, $ipversion) = @_;
2030
2031 my $lc_direction = lc($direction);
2032
2033 my $rules = $vmfw_conf->{rules};
2034
2035 my $options = $vmfw_conf->{options};
2036 my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
2037
2038 my $tapchain = "$iface-$direction";
2039
2040 my $ipfilter_name = compute_ipfilter_ipset_name($netid);
2041 my $ipfilter_ipset = compute_ipset_chain_name($vmid, $ipfilter_name, $ipversion)
2042 if $vmfw_conf->{ipset}->{$ipfilter_name};
2043
2044 # create chain with mac and ip filter
2045 ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
2046
2047 if ($options->{enable}) {
2048 ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $tapchain, $netid, $direction, $options, $ipversion);
2049
2050 ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface);
2051
2052 # implement policy
2053 my $policy;
2054
2055 if ($direction eq 'OUT') {
2056 $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
2057 } else {
2058 $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
2059 }
2060
2061 my $accept = generate_nfqueue($options);
2062 my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
2063 ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, $policy, $loglevel, $accept_action);
2064 } else {
2065 my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : 'ACCEPT';
2066 ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, 'ACCEPT', $loglevel, $accept_action);
2067 }
2068
2069 # plug the tap chain to bridge chain
2070 if ($direction eq 'IN') {
2071 ruleset_addrule($ruleset, "PVEFW-FWBR-IN",
2072 "-m physdev --physdev-is-bridged --physdev-out $iface -j $tapchain");
2073 } else {
2074 ruleset_addrule($ruleset, "PVEFW-FWBR-OUT",
2075 "-m physdev --physdev-is-bridged --physdev-in $iface -j $tapchain");
2076 }
2077 }
2078
2079 sub enable_host_firewall {
2080 my ($ruleset, $hostfw_conf, $cluster_conf, $ipversion) = @_;
2081
2082 my $options = $hostfw_conf->{options};
2083 my $cluster_options = $cluster_conf->{options};
2084 my $rules = $hostfw_conf->{rules};
2085 my $cluster_rules = $cluster_conf->{rules};
2086
2087 # host inbound firewall
2088 my $chain = "PVEFW-HOST-IN";
2089 ruleset_create_chain($ruleset, $chain);
2090
2091 my $loglevel = get_option_log_level($options, "log_level_in");
2092
2093 ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
2094
2095 ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
2096 ruleset_chain_add_input_filters($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel);
2097
2098 # we use RETURN because we need to check also tap rules
2099 my $accept_action = 'RETURN';
2100
2101 ruleset_addrule($ruleset, $chain, "-p igmp -j $accept_action"); # important for multicast
2102
2103 # add host rules first, so that cluster wide rules can be overwritten
2104 foreach my $rule (@$rules, @$cluster_rules) {
2105 next if !$rule->{enable} || $rule->{errors};
2106 next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2107
2108 $rule->{iface_in} = $rule->{iface} if $rule->{iface};
2109
2110 eval {
2111 if ($rule->{type} eq 'group') {
2112 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'IN', $accept_action, $ipversion);
2113 } elsif ($rule->{type} eq 'in') {
2114 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
2115 { ACCEPT => $accept_action, REJECT => "PVEFW-reject" },
2116 undef, $cluster_conf, $hostfw_conf);
2117 }
2118 };
2119 warn $@ if $@;
2120 delete $rule->{iface_in};
2121 }
2122
2123 # allow standard traffic for management ipset (includes cluster network)
2124 my $mngmnt_ipset_chain = compute_ipset_chain_name(0, "management", $ipversion);
2125 my $mngmntsrc = "-m set --match-set ${mngmnt_ipset_chain} src";
2126 ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 8006 -j $accept_action"); # PVE API
2127 ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 5900:5999 -j $accept_action"); # PVE VNC Console
2128 ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 3128 -j $accept_action"); # SPICE Proxy
2129 ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 22 -j $accept_action"); # SSH
2130
2131 my $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
2132 my $localnet_ver = $cluster_conf->{aliases}->{local_network}->{ipversion};
2133
2134 # corosync
2135 if ($localnet && ($ipversion == $localnet_ver)) {
2136 my $corosync_rule = "-p udp --dport 5404:5405 -j $accept_action";
2137 ruleset_addrule($ruleset, $chain, "-s $localnet -d $localnet $corosync_rule");
2138 ruleset_addrule($ruleset, $chain, "-s $localnet -m addrtype --dst-type MULTICAST $corosync_rule");
2139 }
2140
2141 # implement input policy
2142 my $policy = $cluster_options->{policy_in} || 'DROP'; # allow nothing by default
2143 ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2144
2145 # host outbound firewall
2146 $chain = "PVEFW-HOST-OUT";
2147 ruleset_create_chain($ruleset, $chain);
2148
2149 $loglevel = get_option_log_level($options, "log_level_out");
2150
2151 ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
2152
2153 ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
2154
2155 # we use RETURN because we may want to check other thigs later
2156 $accept_action = 'RETURN';
2157
2158 ruleset_addrule($ruleset, $chain, "-p igmp -j $accept_action"); # important for multicast
2159
2160 # add host rules first, so that cluster wide rules can be overwritten
2161 foreach my $rule (@$rules, @$cluster_rules) {
2162 next if !$rule->{enable} || $rule->{errors};
2163 next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2164
2165 $rule->{iface_out} = $rule->{iface} if $rule->{iface};
2166 eval {
2167 if ($rule->{type} eq 'group') {
2168 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'OUT', $accept_action, $ipversion);
2169 } elsif ($rule->{type} eq 'out') {
2170 ruleset_generate_rule($ruleset, $chain, $ipversion,
2171 $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" },
2172 undef, $cluster_conf, $hostfw_conf);
2173 }
2174 };
2175 warn $@ if $@;
2176 delete $rule->{iface_out};
2177 }
2178
2179 # allow standard traffic on cluster network
2180 if ($localnet && ($ipversion == $localnet_ver)) {
2181 ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 8006 -j $accept_action"); # PVE API
2182 ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 22 -j $accept_action"); # SSH
2183 ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 5900:5999 -j $accept_action"); # PVE VNC Console
2184 ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 3128 -j $accept_action"); # SPICE Proxy
2185
2186 my $corosync_rule = "-p udp --dport 5404:5405 -j $accept_action";
2187 ruleset_addrule($ruleset, $chain, "-d $localnet $corosync_rule");
2188 ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule");
2189 }
2190
2191 # implement output policy
2192 $policy = $cluster_options->{policy_out} || 'ACCEPT'; # allow everything by default
2193 ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2194
2195 ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
2196 ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
2197 }
2198
2199 sub generate_group_rules {
2200 my ($ruleset, $cluster_conf, $group, $ipversion) = @_;
2201
2202 my $rules = $cluster_conf->{groups}->{$group};
2203
2204 if (!$rules) {
2205 warn "no such security group '$group'\n";
2206 $rules = []; # create empty chain
2207 }
2208
2209 my $chain = "GROUP-${group}-IN";
2210
2211 ruleset_create_chain($ruleset, $chain);
2212 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
2213
2214 foreach my $rule (@$rules) {
2215 next if $rule->{type} ne 'in';
2216 next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2217 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
2218 { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" },
2219 undef, $cluster_conf);
2220 }
2221
2222 $chain = "GROUP-${group}-OUT";
2223
2224 ruleset_create_chain($ruleset, $chain);
2225 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
2226
2227 foreach my $rule (@$rules) {
2228 next if $rule->{type} ne 'out';
2229 next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2230 # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
2231 # check also other tap rules later
2232 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
2233 { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" },
2234 undef, $cluster_conf);
2235 }
2236 }
2237
2238 my $MAX_NETS = 32;
2239 my $valid_netdev_names = {};
2240 for (my $i = 0; $i < $MAX_NETS; $i++) {
2241 $valid_netdev_names->{"net$i"} = 1;
2242 }
2243
2244 sub parse_fw_rule {
2245 my ($prefix, $line, $cluster_conf, $fw_conf, $rule_env, $verbose) = @_;
2246
2247 my $orig_line = $line;
2248
2249 my $rule = {};
2250
2251 # we can add single line comments to the end of the rule
2252 if ($line =~ s/#\s*(.*?)\s*$//) {
2253 $rule->{comment} = decode('utf8', $1);
2254 }
2255
2256 # we can disable a rule when prefixed with '|'
2257
2258 $rule->{enable} = $line =~ s/^\|// ? 0 : 1;
2259
2260 $line =~ s/^(\S+)\s+(\S+)\s*// ||
2261 die "unable to parse rule: $line\n";
2262
2263 $rule->{type} = lc($1);
2264 $rule->{action} = $2;
2265
2266 if ($rule->{type} eq 'in' || $rule->{type} eq 'out') {
2267 if ($rule->{action} =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
2268 $rule->{macro} = $1;
2269 $rule->{action} = $2;
2270 }
2271 }
2272
2273 while (length($line)) {
2274 if ($line =~ s/^-i (\S+)\s*//) {
2275 $rule->{iface} = $1;
2276 next;
2277 }
2278
2279 last if $rule->{type} eq 'group';
2280
2281 if ($line =~ s/^-p (\S+)\s*//) {
2282 $rule->{proto} = $1;
2283 next;
2284 }
2285
2286 if ($line =~ s/^-dport (\S+)\s*//) {
2287 $rule->{dport} = $1;
2288 next;
2289 }
2290
2291 if ($line =~ s/^-sport (\S+)\s*//) {
2292 $rule->{sport} = $1;
2293 next;
2294 }
2295 if ($line =~ s/^-source (\S+)\s*//) {
2296 $rule->{source} = $1;
2297 next;
2298 }
2299 if ($line =~ s/^-dest (\S+)\s*//) {
2300 $rule->{dest} = $1;
2301 next;
2302 }
2303
2304 last;
2305 }
2306
2307 die "unable to parse rule parameters: $line\n" if length($line);
2308
2309 $rule = verify_rule($rule, $cluster_conf, $fw_conf, $rule_env, 1);
2310 if ($verbose && $rule->{errors}) {
2311 warn "$prefix - errors in rule parameters: $orig_line\n";
2312 foreach my $p (keys %{$rule->{errors}}) {
2313 warn " $p: $rule->{errors}->{$p}\n";
2314 }
2315 }
2316
2317 return $rule;
2318 }
2319
2320 sub parse_vmfw_option {
2321 my ($line) = @_;
2322
2323 my ($opt, $value);
2324
2325 my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2326
2327 if ($line =~ m/^(enable|dhcp|macfilter|ips):\s*(0|1)\s*$/i) {
2328 $opt = lc($1);
2329 $value = int($2);
2330 } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
2331 $opt = lc($1);
2332 $value = $2 ? lc($3) : '';
2333 } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2334 $opt = lc($1);
2335 $value = uc($3);
2336 } elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
2337 $opt = lc($1);
2338 $value = $2;
2339 } else {
2340 die "can't parse option '$line'\n"
2341 }
2342
2343 return ($opt, $value);
2344 }
2345
2346 sub parse_hostfw_option {
2347 my ($line) = @_;
2348
2349 my ($opt, $value);
2350
2351 my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2352
2353 if ($line =~ m/^(enable|nosmurfs|tcpflags):\s*(0|1)\s*$/i) {
2354 $opt = lc($1);
2355 $value = int($2);
2356 } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
2357 $opt = lc($1);
2358 $value = $2 ? lc($3) : '';
2359 } elsif ($line =~ m/^(nf_conntrack_max|nf_conntrack_tcp_timeout_established):\s*(\d+)\s*$/i) {
2360 $opt = lc($1);
2361 $value = int($2);
2362 } else {
2363 die "can't parse option '$line'\n"
2364 }
2365
2366 return ($opt, $value);
2367 }
2368
2369 sub parse_clusterfw_option {
2370 my ($line) = @_;
2371
2372 my ($opt, $value);
2373
2374 if ($line =~ m/^(enable):\s*(0|1)\s*$/i) {
2375 $opt = lc($1);
2376 $value = int($2);
2377 } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2378 $opt = lc($1);
2379 $value = uc($3);
2380 } else {
2381 die "can't parse option '$line'\n"
2382 }
2383
2384 return ($opt, $value);
2385 }
2386
2387 sub resolve_alias {
2388 my ($clusterfw_conf, $fw_conf, $cidr) = @_;
2389
2390 my $alias = lc($cidr);
2391 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2392 $e = $clusterfw_conf->{aliases}->{$alias} if !$e && $clusterfw_conf;
2393
2394 die "no such alias '$cidr'\n" if !$e;;
2395
2396 return wantarray ? ($e->{cidr}, $e->{ipversion}) : $e->{cidr};
2397 }
2398
2399 sub parse_ip_or_cidr {
2400 my ($cidr) = @_;
2401
2402 my $ipversion;
2403
2404 if ($cidr =~ m!^(?:$IPV6RE)(/(\d+))?$!) {
2405 $cidr =~ s|/128$||;
2406 $ipversion = 6;
2407 } elsif ($cidr =~ m!^(?:$IPV4RE)(/(\d+))?$!) {
2408 $cidr =~ s|/32$||;
2409 $ipversion = 4;
2410 } else {
2411 die "value does not look like a valid IP address or CIDR network\n";
2412 }
2413
2414 return wantarray ? ($cidr, $ipversion) : $cidr;
2415 }
2416
2417 sub parse_alias {
2418 my ($line) = @_;
2419
2420 # we can add single line comments to the end of the line
2421 my $comment = decode('utf8', $1) if $line =~ s/\s*#\s*(.*?)\s*$//;
2422
2423 if ($line =~ m/^(\S+)\s(\S+)$/) {
2424 my ($name, $cidr) = ($1, $2);
2425 my $ipversion;
2426
2427 ($cidr, $ipversion) = parse_ip_or_cidr($cidr);
2428
2429 my $data = {
2430 name => $name,
2431 cidr => $cidr,
2432 ipversion => $ipversion,
2433 };
2434 $data->{comment} = $comment if $comment;
2435 return $data;
2436 }
2437
2438 return undef;
2439 }
2440
2441 sub generic_fw_config_parser {
2442 my ($filename, $fh, $verbose, $cluster_conf, $empty_conf, $rule_env) = @_;
2443
2444 my $section;
2445 my $group;
2446
2447 my $res = $empty_conf;
2448
2449 while (defined(my $line = <$fh>)) {
2450 next if $line =~ m/^#/;
2451 next if $line =~ m/^\s*$/;
2452
2453 chomp $line;
2454
2455 my $linenr = $fh->input_line_number();
2456 my $prefix = "$filename (line $linenr)";
2457
2458 if ($empty_conf->{options} && ($line =~ m/^\[options\]$/i)) {
2459 $section = 'options';
2460 next;
2461 }
2462
2463 if ($empty_conf->{aliases} && ($line =~ m/^\[aliases\]$/i)) {
2464 $section = 'aliases';
2465 next;
2466 }
2467
2468 if ($empty_conf->{groups} && ($line =~ m/^\[group\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2469 $section = 'groups';
2470 $group = lc($1);
2471 my $comment = $2;
2472 eval {
2473 die "security group name too long\n" if length($group) > $max_group_name_length;
2474 die "invalid security group name '$group'\n" if $group !~ m/^${security_group_name_pattern}$/;
2475 };
2476 if (my $err = $@) {
2477 ($section, $group, $comment) = undef;
2478 warn "$prefix: $err";
2479 next;
2480 }
2481
2482 $res->{$section}->{$group} = [];
2483 $res->{group_comments}->{$group} = decode('utf8', $comment)
2484 if $comment;
2485 next;
2486 }
2487
2488 if ($empty_conf->{rules} && ($line =~ m/^\[rules\]$/i)) {
2489 $section = 'rules';
2490 next;
2491 }
2492
2493 if ($empty_conf->{ipset} && ($line =~ m/^\[ipset\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2494 $section = 'ipset';
2495 $group = lc($1);
2496 my $comment = $2;
2497 eval {
2498 die "ipset name too long\n" if length($group) > $max_ipset_name_length;
2499 die "invalid ipset name '$group'\n" if $group !~ m/^${ipset_name_pattern}$/;
2500 };
2501 if (my $err = $@) {
2502 ($section, $group, $comment) = undef;
2503 warn "$prefix: $err";
2504 next;
2505 }
2506
2507 $res->{$section}->{$group} = [];
2508 $res->{ipset_comments}->{$group} = decode('utf8', $comment)
2509 if $comment;
2510 next;
2511 }
2512
2513 if (!$section) {
2514 warn "$prefix: skip line - no section\n";
2515 next;
2516 }
2517
2518 if ($section eq 'options') {
2519 eval {
2520 my ($opt, $value);
2521 if ($rule_env eq 'cluster') {
2522 ($opt, $value) = parse_clusterfw_option($line);
2523 } elsif ($rule_env eq 'host') {
2524 ($opt, $value) = parse_hostfw_option($line);
2525 } else {
2526 ($opt, $value) = parse_vmfw_option($line);
2527 }
2528 $res->{options}->{$opt} = $value;
2529 };
2530 warn "$prefix: $@" if $@;
2531 } elsif ($section eq 'aliases') {
2532 eval {
2533 my $data = parse_alias($line);
2534 $res->{aliases}->{lc($data->{name})} = $data;
2535 };
2536 warn "$prefix: $@" if $@;
2537 } elsif ($section eq 'rules') {
2538 my $rule;
2539 eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, $res, $rule_env, $verbose); };
2540 if (my $err = $@) {
2541 warn "$prefix: $err";
2542 next;
2543 }
2544 push @{$res->{$section}}, $rule;
2545 } elsif ($section eq 'groups') {
2546 my $rule;
2547 eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, undef, 'group', $verbose); };
2548 if (my $err = $@) {
2549 warn "$prefix: $err";
2550 next;
2551 }
2552 push @{$res->{$section}->{$group}}, $rule;
2553 } elsif ($section eq 'ipset') {
2554 # we can add single line comments to the end of the rule
2555 my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
2556
2557 $line =~ m/^(\!)?\s*(\S+)\s*$/;
2558 my $nomatch = $1;
2559 my $cidr = $2;
2560 my $errors;
2561
2562 if ($nomatch && !$feature_ipset_nomatch) {
2563 $errors->{nomatch} = "nomatch not supported by kernel";
2564 }
2565
2566 eval {
2567 if ($cidr =~ m/^${ip_alias_pattern}$/) {
2568 resolve_alias($cluster_conf, $res, $cidr); # make sure alias exists
2569 } else {
2570 $cidr = parse_ip_or_cidr($cidr);
2571 }
2572 };
2573 if (my $err = $@) {
2574 chomp $err;
2575 $errors->{cidr} = $err;
2576 }
2577
2578 my $entry = { cidr => $cidr };
2579 $entry->{nomatch} = 1 if $nomatch;
2580 $entry->{comment} = $comment if $comment;
2581 $entry->{errors} = $errors if $errors;
2582
2583 if ($verbose && $errors) {
2584 warn "$prefix - errors in ipset '$group': $line\n";
2585 foreach my $p (keys %{$errors}) {
2586 warn " $p: $errors->{$p}\n";
2587 }
2588 }
2589
2590 push @{$res->{$section}->{$group}}, $entry;
2591 } else {
2592 warn "$prefix: skip line - unknown section\n";
2593 next;
2594 }
2595 }
2596
2597 return $res;
2598 }
2599
2600 sub parse_hostfw_config {
2601 my ($filename, $fh, $cluster_conf, $verbose) = @_;
2602
2603 my $empty_conf = { rules => [], options => {}};
2604
2605 return generic_fw_config_parser($filename, $fh, $verbose, $cluster_conf, $empty_conf, 'host');
2606 }
2607
2608 sub parse_vmfw_config {
2609 my ($filename, $fh, $cluster_conf, $rule_env, $verbose) = @_;
2610
2611 my $empty_conf = {
2612 rules => [],
2613 options => {},
2614 aliases => {},
2615 ipset => {} ,
2616 ipset_comments => {},
2617 };
2618
2619 return generic_fw_config_parser($filename, $fh, $verbose, $cluster_conf, $empty_conf, $rule_env);
2620 }
2621
2622 sub parse_clusterfw_config {
2623 my ($filename, $fh, $verbose) = @_;
2624
2625 my $section;
2626 my $group;
2627
2628 my $empty_conf = {
2629 rules => [],
2630 options => {},
2631 aliases => {},
2632 groups => {},
2633 group_comments => {},
2634 ipset => {} ,
2635 ipset_comments => {},
2636 };
2637
2638 return generic_fw_config_parser($filename, $fh, $verbose, $empty_conf, $empty_conf, 'cluster');
2639 }
2640
2641 sub run_locked {
2642 my ($code, @param) = @_;
2643
2644 my $timeout = 10;
2645
2646 my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
2647
2648 die $@ if $@;
2649
2650 return $res;
2651 }
2652
2653 sub read_local_vm_config {
2654
2655 my $openvz = {};
2656 my $qemu = {};
2657
2658 my $vmdata = { openvz => $openvz, qemu => $qemu };
2659
2660 my $vmlist = PVE::Cluster::get_vmlist();
2661 return $vmdata if !$vmlist || !$vmlist->{ids};
2662 my $ids = $vmlist->{ids};
2663
2664 foreach my $vmid (keys %$ids) {
2665 next if !$vmid; # skip VE0
2666 my $d = $ids->{$vmid};
2667 next if !$d->{node} || $d->{node} ne $nodename;
2668 next if !$d->{type};
2669 if ($d->{type} eq 'openvz') {
2670 if ($have_pve_manager) {
2671 my $cfspath = PVE::OpenVZ::cfs_config_path($vmid);
2672 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2673 $openvz->{$vmid} = $conf;
2674 }
2675 }
2676 } elsif ($d->{type} eq 'qemu') {
2677 if ($have_qemu_server) {
2678 my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
2679 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2680 $qemu->{$vmid} = $conf;
2681 }
2682 }
2683 }
2684 }
2685
2686 return $vmdata;
2687 };
2688
2689 sub load_vmfw_conf {
2690 my ($cluster_conf, $rule_env, $vmid, $dir, $verbose) = @_;
2691
2692 my $vmfw_conf = {};
2693
2694 $dir = $pvefw_conf_dir if !defined($dir);
2695
2696 my $filename = "$dir/$vmid.fw";
2697 if (my $fh = IO::File->new($filename, O_RDONLY)) {
2698 $vmfw_conf = parse_vmfw_config($filename, $fh, $cluster_conf, $rule_env, $verbose);
2699 $vmfw_conf->{vmid} = $vmid;
2700 }
2701
2702 return $vmfw_conf;
2703 }
2704
2705 my $format_rules = sub {
2706 my ($rules, $allow_iface) = @_;
2707
2708 my $raw = '';
2709
2710 foreach my $rule (@$rules) {
2711 if ($rule->{type} eq 'in' || $rule->{type} eq 'out' || $rule->{type} eq 'group') {
2712 $raw .= '|' if defined($rule->{enable}) && !$rule->{enable};
2713 $raw .= uc($rule->{type});
2714 if ($rule->{macro}) {
2715 $raw .= " $rule->{macro}($rule->{action})";
2716 } else {
2717 $raw .= " " . $rule->{action};
2718 }
2719 if ($allow_iface && $rule->{iface}) {
2720 $raw .= " -i $rule->{iface}";
2721 }
2722
2723 if ($rule->{type} ne 'group') {
2724 $raw .= " -source $rule->{source}" if $rule->{source};
2725 $raw .= " -dest $rule->{dest}" if $rule->{dest};
2726 $raw .= " -p $rule->{proto}" if $rule->{proto};
2727 $raw .= " -dport $rule->{dport}" if $rule->{dport};
2728 $raw .= " -sport $rule->{sport}" if $rule->{sport};
2729 }
2730
2731 $raw .= " # " . encode('utf8', $rule->{comment})
2732 if $rule->{comment} && $rule->{comment} !~ m/^\s*$/;
2733 $raw .= "\n";
2734 } else {
2735 die "unknown rule type '$rule->{type}'";
2736 }
2737 }
2738
2739 return $raw;
2740 };
2741
2742 my $format_options = sub {
2743 my ($options) = @_;
2744
2745 my $raw = '';
2746
2747 $raw .= "[OPTIONS]\n\n";
2748 foreach my $opt (keys %$options) {
2749 $raw .= "$opt: $options->{$opt}\n";
2750 }
2751 $raw .= "\n";
2752
2753 return $raw;
2754 };
2755
2756 my $format_aliases = sub {
2757 my ($aliases) = @_;
2758
2759 my $raw = '';
2760
2761 $raw .= "[ALIASES]\n\n";
2762 foreach my $k (keys %$aliases) {
2763 my $e = $aliases->{$k};
2764 $raw .= "$e->{name} $e->{cidr}";
2765 $raw .= " # " . encode('utf8', $e->{comment})
2766 if $e->{comment} && $e->{comment} !~ m/^\s*$/;
2767 $raw .= "\n";
2768 }
2769 $raw .= "\n";
2770
2771 return $raw;
2772 };
2773
2774 my $format_ipsets = sub {
2775 my ($fw_conf) = @_;
2776
2777 my $raw = '';
2778
2779 foreach my $ipset (sort keys %{$fw_conf->{ipset}}) {
2780 if (my $comment = $fw_conf->{ipset_comments}->{$ipset}) {
2781 my $utf8comment = encode('utf8', $comment);
2782 $raw .= "[IPSET $ipset] # $utf8comment\n\n";
2783 } else {
2784 $raw .= "[IPSET $ipset]\n\n";
2785 }
2786 my $options = $fw_conf->{ipset}->{$ipset};
2787
2788 my $nethash = {};
2789 foreach my $entry (@$options) {
2790 $nethash->{$entry->{cidr}} = $entry;
2791 }
2792
2793 foreach my $cidr (sort keys %$nethash) {
2794 my $entry = $nethash->{$cidr};
2795 my $line = $entry->{nomatch} ? '!' : '';
2796 $line .= $entry->{cidr};
2797 $line .= " # " . encode('utf8', $entry->{comment})
2798 if $entry->{comment} && $entry->{comment} !~ m/^\s*$/;
2799 $raw .= "$line\n";
2800 }
2801
2802 $raw .= "\n";
2803 }
2804
2805 return $raw;
2806 };
2807
2808 sub save_vmfw_conf {
2809 my ($vmid, $vmfw_conf) = @_;
2810
2811 my $raw = '';
2812
2813 my $options = $vmfw_conf->{options};
2814 $raw .= &$format_options($options) if $options && scalar(keys %$options);
2815
2816 my $aliases = $vmfw_conf->{aliases};
2817 $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
2818
2819 $raw .= &$format_ipsets($vmfw_conf) if $vmfw_conf->{ipset};
2820
2821 my $rules = $vmfw_conf->{rules} || [];
2822 if ($rules && scalar(@$rules)) {
2823 $raw .= "[RULES]\n\n";
2824 $raw .= &$format_rules($rules, 1);
2825 $raw .= "\n";
2826 }
2827
2828 mkdir $pvefw_conf_dir;
2829
2830 my $filename = "$pvefw_conf_dir/$vmid.fw";
2831 PVE::Tools::file_set_contents($filename, $raw);
2832 }
2833
2834 sub read_vm_firewall_configs {
2835 my ($cluster_conf, $vmdata, $dir, $verbose) = @_;
2836
2837 my $vmfw_configs = {};
2838
2839 foreach my $vmid (keys %{$vmdata->{qemu}}) {
2840 my $vmfw_conf = load_vmfw_conf($cluster_conf, 'vm', $vmid, $dir, $verbose);
2841 next if !$vmfw_conf->{options}; # skip if file does not exists
2842 $vmfw_configs->{$vmid} = $vmfw_conf;
2843 }
2844 foreach my $vmid (keys %{$vmdata->{openvz}}) {
2845 my $vmfw_conf = load_vmfw_conf($cluster_conf, 'ct', $vmid, $dir, $verbose);
2846 next if !$vmfw_conf->{options}; # skip if file does not exists
2847 $vmfw_configs->{$vmid} = $vmfw_conf;
2848 }
2849
2850 return $vmfw_configs;
2851 }
2852
2853 sub get_option_log_level {
2854 my ($options, $k) = @_;
2855
2856 my $v = $options->{$k};
2857 $v = $default_log_level if !defined($v);
2858
2859 return undef if $v eq '' || $v eq 'nolog';
2860
2861 $v = $log_level_hash->{$v} if defined($log_level_hash->{$v});
2862
2863 return $v if ($v >= 0) && ($v <= 7);
2864
2865 warn "unknown log level ($k = '$v')\n";
2866
2867 return undef;
2868 }
2869
2870 sub generate_std_chains {
2871 my ($ruleset, $options, $ipversion) = @_;
2872
2873 my $std_chains = $pve_std_chains->{$ipversion} || die "internal error";
2874
2875 my $loglevel = get_option_log_level($options, 'smurf_log_level');
2876
2877 my $chain;
2878
2879 if ($ipversion == 4) {
2880 # same as shorewall smurflog.
2881 $chain = 'PVEFW-smurflog';
2882 $std_chains->{$chain} = [];
2883
2884 push @{$std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
2885 push @{$std_chains->{$chain}}, "-j DROP";
2886 }
2887
2888 # same as shorewall logflags action.
2889 $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
2890 $chain = 'PVEFW-logflags';
2891 $std_chains->{$chain} = [];
2892
2893 # fixme: is this correctly logged by pvewf-logger? (ther is no --log-ip-options for NFLOG)
2894 push @{$std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
2895 push @{$std_chains->{$chain}}, "-j DROP";
2896
2897 foreach my $chain (keys %$std_chains) {
2898 ruleset_create_chain($ruleset, $chain);
2899 foreach my $rule (@{$std_chains->{$chain}}) {
2900 if (ref($rule)) {
2901 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule);
2902 } else {
2903 ruleset_addrule($ruleset, $chain, $rule);
2904 }
2905 }
2906 }
2907 }
2908
2909 sub generate_ipset_chains {
2910 my ($ipset_ruleset, $clusterfw_conf, $fw_conf) = @_; #fixme
2911
2912 foreach my $ipset (keys %{$fw_conf->{ipset}}) {
2913
2914 my $options = $fw_conf->{ipset}->{$ipset};
2915
2916 # remove duplicates
2917 my $nethash = {};
2918 foreach my $entry (@$options) {
2919 next if $entry->{errors}; # skip entries with errors
2920 eval {
2921 my ($cidr, $ver);
2922 if ($entry->{cidr} =~ m/^${ip_alias_pattern}$/) {
2923 ($cidr, $ver) = resolve_alias($clusterfw_conf, $fw_conf, $entry->{cidr});
2924 } else {
2925 ($cidr, $ver) = parse_ip_or_cidr($entry->{cidr});
2926 }
2927 #http://backreference.org/2013/03/01/ipv6-address-normalization/
2928 if ($ver == 6) {
2929 my $ipv6 = inet_pton(AF_INET6, lc($cidr));
2930 $cidr = inet_ntop(AF_INET6, $ipv6);
2931 $cidr =~ s|/128$||;
2932 } else {
2933 $cidr =~ s|/32$||;
2934 }
2935
2936 $nethash->{$ver}->{$cidr} = { cidr => $cidr, nomatch => $entry->{nomatch} };
2937 };
2938 warn $@ if $@;
2939 }
2940
2941 foreach my $ipversion (4, 6) {
2942 my $data = $nethash->{$ipversion};
2943
2944 my $name = compute_ipset_chain_name($fw_conf->{vmid}, $ipset, $ipversion);
2945
2946 my $hashsize = scalar(@$options);
2947 if ($hashsize <= 64) {
2948 $hashsize = 64;
2949 } else {
2950 $hashsize = round_powerof2($hashsize);
2951 }
2952
2953 my $family = $ipversion == "6" ? "inet6" : "inet";
2954
2955 $ipset_ruleset->{$name} = ["create $name hash:net family $family hashsize $hashsize maxelem $hashsize"];
2956
2957 foreach my $cidr (sort keys %$data) {
2958 my $entry = $data->{$cidr};
2959
2960 my $cmd = "add $name $cidr";
2961 if ($entry->{nomatch}) {
2962 if ($feature_ipset_nomatch) {
2963 push @{$ipset_ruleset->{$name}}, "$cmd nomatch";
2964 } else {
2965 warn "ignore !$cidr - nomatch not supported by kernel\n";
2966 }
2967 } else {
2968 push @{$ipset_ruleset->{$name}}, $cmd;
2969 }
2970 }
2971 }
2972 }
2973 }
2974
2975 sub round_powerof2 {
2976 my ($int) = @_;
2977
2978 $int--;
2979 $int |= $int >> $_ foreach (1,2,4,8,16);
2980 return ++$int;
2981 }
2982
2983 sub load_clusterfw_conf {
2984 my ($filename, $verbose) = @_;
2985
2986 $filename = $clusterfw_conf_filename if !defined($filename);
2987
2988 my $cluster_conf = {};
2989 if (my $fh = IO::File->new($filename, O_RDONLY)) {
2990 $cluster_conf = parse_clusterfw_config($filename, $fh, $verbose);
2991 }
2992
2993 return $cluster_conf;
2994 }
2995
2996 sub save_clusterfw_conf {
2997 my ($cluster_conf) = @_;
2998
2999 my $raw = '';
3000
3001 my $options = $cluster_conf->{options};
3002 $raw .= &$format_options($options) if $options && scalar(keys %$options);
3003
3004 my $aliases = $cluster_conf->{aliases};
3005 $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3006
3007 $raw .= &$format_ipsets($cluster_conf) if $cluster_conf->{ipset};
3008
3009 my $rules = $cluster_conf->{rules};
3010 if ($rules && scalar(@$rules)) {
3011 $raw .= "[RULES]\n\n";
3012 $raw .= &$format_rules($rules, 1);
3013 $raw .= "\n";
3014 }
3015
3016 if ($cluster_conf->{groups}) {
3017 foreach my $group (sort keys %{$cluster_conf->{groups}}) {
3018 my $rules = $cluster_conf->{groups}->{$group};
3019 if (my $comment = $cluster_conf->{group_comments}->{$group}) {
3020 my $utf8comment = encode('utf8', $comment);
3021 $raw .= "[group $group] # $utf8comment\n\n";
3022 } else {
3023 $raw .= "[group $group]\n\n";
3024 }
3025
3026 $raw .= &$format_rules($rules, 0);
3027 $raw .= "\n";
3028 }
3029 }
3030
3031 mkdir $pvefw_conf_dir;
3032 PVE::Tools::file_set_contents($clusterfw_conf_filename, $raw);
3033 }
3034
3035 sub load_hostfw_conf {
3036 my ($cluster_conf, $filename, $verbose) = @_;
3037
3038 $filename = $hostfw_conf_filename if !defined($filename);
3039
3040 my $hostfw_conf = {};
3041 if (my $fh = IO::File->new($filename, O_RDONLY)) {
3042 $hostfw_conf = parse_hostfw_config($filename, $fh, $cluster_conf, $verbose);
3043 }
3044 return $hostfw_conf;
3045 }
3046
3047 sub save_hostfw_conf {
3048 my ($hostfw_conf) = @_;
3049
3050 my $raw = '';
3051
3052 my $options = $hostfw_conf->{options};
3053 $raw .= &$format_options($options) if $options && scalar(keys %$options);
3054
3055 my $rules = $hostfw_conf->{rules};
3056 if ($rules && scalar(@$rules)) {
3057 $raw .= "[RULES]\n\n";
3058 $raw .= &$format_rules($rules, 1);
3059 $raw .= "\n";
3060 }
3061
3062 PVE::Tools::file_set_contents($hostfw_conf_filename, $raw);
3063 }
3064
3065 sub compile {
3066 my ($cluster_conf, $hostfw_conf, $vmdata, $verbose) = @_;
3067
3068 my $vmfw_configs;
3069
3070 if ($vmdata) { # test mode
3071 my $testdir = $vmdata->{testdir} || die "no test directory specified";
3072 my $filename = "$testdir/cluster.fw";
3073 $cluster_conf = load_clusterfw_conf($filename, $verbose);
3074
3075 $filename = "$testdir/host.fw";
3076 $hostfw_conf = load_hostfw_conf($cluster_conf, $filename, $verbose);
3077
3078 $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, $testdir, $verbose);
3079 } else { # normal operation
3080 $cluster_conf = load_clusterfw_conf(undef, $verbose) if !$cluster_conf;
3081
3082 $hostfw_conf = load_hostfw_conf($cluster_conf, undef, $verbose) if !$hostfw_conf;
3083
3084 $vmdata = read_local_vm_config();
3085 $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, undef, $verbose);
3086 }
3087
3088 my ($ruleset, $ipset_ruleset) = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 4, $verbose);
3089 my ($rulesetv6) = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 6, $verbose);
3090
3091 return ($ruleset, $ipset_ruleset, $rulesetv6);
3092 }
3093
3094 sub compile_iptables_filter {
3095 my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $ipversion, $verbose) = @_;
3096
3097 $cluster_conf->{ipset}->{venet0} = [];
3098 my $venet0_ipset_chain = compute_ipset_chain_name(0, 'venet0', $ipversion);
3099
3100 my $localnet;
3101 if ($cluster_conf->{aliases}->{local_network}) {
3102 $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3103 } else {
3104 my $localnet_ver;
3105 ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3106
3107 $cluster_conf->{aliases}->{local_network} = {
3108 name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3109 }
3110
3111 push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3112
3113 return ({}, {}) if !$cluster_conf->{options}->{enable};
3114
3115 my $ruleset = {};
3116
3117 ruleset_create_chain($ruleset, "PVEFW-INPUT");
3118 ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
3119
3120 ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3121
3122 my $hostfw_options = $hostfw_conf->{options} || {};
3123
3124 # fixme: what log level should we use here?
3125 my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
3126
3127 ruleset_chain_add_conn_filters($ruleset, "PVEFW-FORWARD", "ACCEPT");
3128
3129
3130 ruleset_create_chain($ruleset, "PVEFW-VENET-OUT");
3131 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i venet0 -m set --match-set ${venet0_ipset_chain} src -j PVEFW-VENET-OUT");
3132 ruleset_addrule($ruleset, "PVEFW-INPUT", "-i venet0 -m set --match-set ${venet0_ipset_chain} src -j PVEFW-VENET-OUT");
3133
3134 ruleset_create_chain($ruleset, "PVEFW-FWBR-IN");
3135 ruleset_chain_add_input_filters($ruleset, "PVEFW-FWBR-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
3136
3137 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-in fwln+ -j PVEFW-FWBR-IN");
3138
3139 ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3140 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-out fwln+ -j PVEFW-FWBR-OUT");
3141
3142 ruleset_create_chain($ruleset, "PVEFW-VENET-IN");
3143 ruleset_chain_add_input_filters($ruleset, "PVEFW-VENET-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
3144
3145 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o venet0 -m set --match-set ${venet0_ipset_chain} dst -j PVEFW-VENET-IN");
3146
3147 generate_std_chains($ruleset, $hostfw_options, $ipversion);
3148
3149 my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
3150
3151 my $ipset_ruleset = {};
3152
3153 if ($hostfw_enable) {
3154 eval { enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf, $ipversion); };
3155 warn $@ if $@; # just to be sure - should not happen
3156 }
3157
3158 ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-o venet0 -m set --match-set ${venet0_ipset_chain} dst -j PVEFW-VENET-IN");
3159
3160 # generate firewall rules for QEMU VMs
3161 foreach my $vmid (keys %{$vmdata->{qemu}}) {
3162 eval {
3163 my $conf = $vmdata->{qemu}->{$vmid};
3164 my $vmfw_conf = $vmfw_configs->{$vmid};
3165 return if !$vmfw_conf;
3166
3167 generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf);
3168
3169 foreach my $netid (keys %$conf) {
3170 next if $netid !~ m/^net(\d+)$/;
3171 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3172 next if !$net->{firewall};
3173 my $iface = "tap${vmid}i$1";
3174
3175 my $macaddr = $net->{macaddr};
3176 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3177 $vmfw_conf, $vmid, 'IN', $ipversion);
3178 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3179 $vmfw_conf, $vmid, 'OUT', $ipversion);
3180 }
3181 };
3182 warn $@ if $@; # just to be sure - should not happen
3183 }
3184
3185 # generate firewall rules for OpenVZ containers
3186 foreach my $vmid (keys %{$vmdata->{openvz}}) {
3187 eval {
3188 my $conf = $vmdata->{openvz}->{$vmid};
3189
3190 my $vmfw_conf = $vmfw_configs->{$vmid};
3191 return if !$vmfw_conf;
3192
3193 generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf);
3194
3195 if ($vmfw_conf->{options}->{enable}) {
3196 if ($conf->{ip_address} && $conf->{ip_address}->{value}) {
3197 my $ip = $conf->{ip_address}->{value};
3198 $ip =~ s/\s+/,/g;
3199
3200 my @ips = ();
3201
3202 foreach my $singleip (split(',', $ip)) {
3203 my $singleip_ver = parse_address_list($singleip); # make sure we have a valid $ip list
3204 push @{$cluster_conf->{ipset}->{venet0}}, { cidr => $singleip };
3205 push @ips, $singleip if $singleip_ver == $ipversion;
3206 }
3207
3208 if (scalar(@ips)) {
3209 my $ip_list = join(',', @ips);
3210 generate_venet_rules_direction($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip_list, 'IN', $ipversion);
3211 generate_venet_rules_direction($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip_list, 'OUT', $ipversion);
3212 }
3213 }
3214 }
3215
3216 if ($conf->{netif} && $conf->{netif}->{value}) {
3217 my $netif = PVE::OpenVZ::parse_netif($conf->{netif}->{value});
3218 foreach my $netid (keys %$netif) {
3219 my $d = $netif->{$netid};
3220 my $bridge = $d->{bridge};
3221 next if !$bridge || $bridge !~ m/^vmbr\d+(v(\d+))?f$/; # firewall enabled ?
3222 my $macaddr = $d->{mac};
3223 my $iface = $d->{host_ifname};
3224 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3225 $vmfw_conf, $vmid, 'IN', $ipversion);
3226 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3227 $vmfw_conf, $vmid, 'OUT', $ipversion);
3228 }
3229 }
3230 };
3231 warn $@ if $@; # just to be sure - should not happen
3232 }
3233
3234 if(ruleset_chain_exist($ruleset, "PVEFW-IPS")){
3235 ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j PVEFW-IPS");
3236 }
3237
3238 generate_ipset_chains($ipset_ruleset, undef, $cluster_conf);
3239
3240 return ($ruleset, $ipset_ruleset);
3241 }
3242
3243 sub get_ruleset_status {
3244 my ($ruleset, $active_chains, $digest_fn, $verbose) = @_;
3245
3246 my $statushash = {};
3247
3248 foreach my $chain (sort keys %$ruleset) {
3249 my $sig = &$digest_fn($ruleset->{$chain});
3250
3251 $statushash->{$chain}->{sig} = $sig;
3252
3253 my $oldsig = $active_chains->{$chain};
3254 if (!defined($oldsig)) {
3255 $statushash->{$chain}->{action} = 'create';
3256 } else {
3257 if ($oldsig eq $sig) {
3258 $statushash->{$chain}->{action} = 'exists';
3259 } else {
3260 $statushash->{$chain}->{action} = 'update';
3261 }
3262 }
3263 print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
3264 foreach my $cmd (@{$ruleset->{$chain}}) {
3265 print "\t$cmd\n" if $verbose;
3266 }
3267 }
3268
3269 foreach my $chain (sort keys %$active_chains) {
3270 if (!defined($ruleset->{$chain})) {
3271 my $sig = $active_chains->{$chain};
3272 $statushash->{$chain}->{action} = 'delete';
3273 $statushash->{$chain}->{sig} = $sig;
3274 print "delete $chain ($sig)\n" if $verbose;
3275 }
3276 }
3277
3278 return $statushash;
3279 }
3280
3281 sub print_sig_rule {
3282 my ($chain, $sig) = @_;
3283
3284 # We just use this to store a SHA1 checksum used to detect changes
3285 return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
3286 }
3287
3288 sub get_ruleset_cmdlist {
3289 my ($ruleset, $verbose, $iptablescmd) = @_;
3290
3291 my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
3292
3293 my ($active_chains, $hooks) = iptables_get_chains($iptablescmd);
3294 my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, $verbose);
3295
3296 # create missing chains first
3297 foreach my $chain (sort keys %$ruleset) {
3298 my $stat = $statushash->{$chain};
3299 die "internal error" if !$stat;
3300 next if $stat->{action} ne 'create';
3301
3302 $cmdlist .= ":$chain - [0:0]\n";
3303 }
3304
3305 foreach my $h (qw(INPUT OUTPUT FORWARD)) {
3306 my $chain = "PVEFW-$h";
3307 if ($ruleset->{$chain} && !$hooks->{$h}) {
3308 $cmdlist .= "-A $h -j $chain\n";
3309 }
3310 }
3311
3312 foreach my $chain (sort keys %$ruleset) {
3313 my $stat = $statushash->{$chain};
3314 die "internal error" if !$stat;
3315
3316 if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
3317 $cmdlist .= "-F $chain\n";
3318 foreach my $cmd (@{$ruleset->{$chain}}) {
3319 $cmdlist .= "$cmd\n";
3320 }
3321 $cmdlist .= print_sig_rule($chain, $stat->{sig});
3322 } elsif ($stat->{action} eq 'delete') {
3323 die "internal error"; # this should not happen
3324 } elsif ($stat->{action} eq 'exists') {
3325 # do nothing
3326 } else {
3327 die "internal error - unknown status '$stat->{action}'";
3328 }
3329 }
3330
3331 foreach my $chain (keys %$statushash) {
3332 next if $statushash->{$chain}->{action} ne 'delete';
3333 $cmdlist .= "-F $chain\n";
3334 }
3335 foreach my $chain (keys %$statushash) {
3336 next if $statushash->{$chain}->{action} ne 'delete';
3337 next if $chain eq 'PVEFW-INPUT';
3338 next if $chain eq 'PVEFW-OUTPUT';
3339 next if $chain eq 'PVEFW-FORWARD';
3340 $cmdlist .= "-X $chain\n";
3341 }
3342
3343 my $changes = $cmdlist ne "*filter\n" ? 1 : 0;
3344
3345 $cmdlist .= "COMMIT\n";
3346
3347 return wantarray ? ($cmdlist, $changes) : $cmdlist;
3348 }
3349
3350 sub get_ipset_cmdlist {
3351 my ($ruleset, $verbose) = @_;
3352
3353 my $cmdlist = "";
3354
3355 my $delete_cmdlist = "";
3356
3357 my $active_chains = ipset_get_chains();
3358 my $statushash = get_ruleset_status($ruleset, $active_chains, \&ipset_chain_digest, $verbose);
3359
3360 # remove stale _swap chains
3361 foreach my $chain (keys %$active_chains) {
3362 if ($chain =~ m/^PVEFW-\S+_swap$/) {
3363 $cmdlist .= "destroy $chain\n";
3364 }
3365 }
3366
3367 foreach my $chain (keys %$ruleset) {
3368 my $stat = $statushash->{$chain};
3369 die "internal error" if !$stat;
3370
3371 if ($stat->{action} eq 'create') {
3372 foreach my $cmd (@{$ruleset->{$chain}}) {
3373 $cmdlist .= "$cmd\n";
3374 }
3375 }
3376 }
3377
3378 foreach my $chain (keys %$ruleset) {
3379 my $stat = $statushash->{$chain};
3380 die "internal error" if !$stat;
3381
3382 if ($stat->{action} eq 'update') {
3383 my $chain_swap = $chain."_swap";
3384
3385 foreach my $cmd (@{$ruleset->{$chain}}) {
3386 $cmd =~ s/$chain/$chain_swap/;
3387 $cmdlist .= "$cmd\n";
3388 }
3389 $cmdlist .= "swap $chain_swap $chain\n";
3390 $cmdlist .= "flush $chain_swap\n";
3391 $cmdlist .= "destroy $chain_swap\n";
3392 }
3393 }
3394
3395 # the remove unused chains
3396 foreach my $chain (keys %$statushash) {
3397 next if $statushash->{$chain}->{action} ne 'delete';
3398
3399 $delete_cmdlist .= "flush $chain\n";
3400 $delete_cmdlist .= "destroy $chain\n";
3401 }
3402
3403 my $changes = ($cmdlist || $delete_cmdlist) ? 1 : 0;
3404
3405 return ($cmdlist, $delete_cmdlist, $changes);
3406 }
3407
3408 sub apply_ruleset {
3409 my ($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $verbose) = @_;
3410
3411 enable_bridge_firewall();
3412
3413 my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
3414 get_ipset_cmdlist($ipset_ruleset, undef, $verbose);
3415
3416 my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset, $verbose);
3417 my ($cmdlistv6, $changesv6) = get_ruleset_cmdlist($rulesetv6, $verbose, "ip6tables");
3418
3419 if ($verbose) {
3420 if ($ipset_changes) {
3421 print "ipset changes:\n";
3422 print $ipset_create_cmdlist if $ipset_create_cmdlist;
3423 print $ipset_delete_cmdlist if $ipset_delete_cmdlist;
3424 }
3425
3426 if ($changes) {
3427 print "iptables changes:\n";
3428 print $cmdlist;
3429 }
3430
3431 if ($changesv6) {
3432 print "ip6tables changes:\n";
3433 print $cmdlistv6;
3434 }
3435 }
3436
3437 my $tmpfile = "$pve_fw_status_dir/ipsetcmdlist1";
3438 PVE::Tools::file_set_contents($tmpfile, $ipset_create_cmdlist || '');
3439
3440 ipset_restore_cmdlist($ipset_create_cmdlist);
3441
3442 $tmpfile = "$pve_fw_status_dir/ip4cmdlist";
3443 PVE::Tools::file_set_contents($tmpfile, $cmdlist || '');
3444
3445 iptables_restore_cmdlist($cmdlist);
3446
3447 $tmpfile = "$pve_fw_status_dir/ip6cmdlist";
3448 PVE::Tools::file_set_contents($tmpfile, $cmdlistv6 || '');
3449
3450 ip6tables_restore_cmdlist($cmdlistv6);
3451
3452 $tmpfile = "$pve_fw_status_dir/ipsetcmdlist2";
3453 PVE::Tools::file_set_contents($tmpfile, $ipset_delete_cmdlist || '');
3454
3455 ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
3456
3457 # test: re-read status and check if everything is up to date
3458 my $active_chains = iptables_get_chains();
3459 my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, 0);
3460
3461 my $errors;
3462 foreach my $chain (sort keys %$ruleset) {
3463 my $stat = $statushash->{$chain};
3464 if ($stat->{action} ne 'exists') {
3465 warn "unable to update chain '$chain'\n";
3466 $errors = 1;
3467 }
3468 }
3469
3470 my $active_chainsv6 = iptables_get_chains("ip6tables");
3471 my $statushashv6 = get_ruleset_status($rulesetv6, $active_chainsv6, \&iptables_chain_digest, 0);
3472
3473 foreach my $chain (sort keys %$rulesetv6) {
3474 my $stat = $statushashv6->{$chain};
3475 if ($stat->{action} ne 'exists') {
3476 warn "unable to update chain '$chain'\n";
3477 $errors = 1;
3478 }
3479 }
3480
3481 die "unable to apply firewall changes\n" if $errors;
3482
3483 update_nf_conntrack_max($hostfw_conf);
3484
3485 update_nf_conntrack_tcp_timeout_established($hostfw_conf);
3486
3487 }
3488
3489 sub update_nf_conntrack_max {
3490 my ($hostfw_conf) = @_;
3491
3492 my $max = 65536; # reasonable default
3493
3494 my $options = $hostfw_conf->{options} || {};
3495
3496 if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
3497 $max = $options->{nf_conntrack_max};
3498 $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
3499 }
3500
3501 my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
3502 my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
3503
3504 my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
3505
3506 if ($current != $max) {
3507 my $hashsize = int($max/4);
3508 PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
3509 PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
3510 }
3511 }
3512
3513 sub update_nf_conntrack_tcp_timeout_established {
3514 my ($hostfw_conf) = @_;
3515
3516 my $options = $hostfw_conf->{options} || {};
3517
3518 my $value = defined($options->{nf_conntrack_tcp_timeout_established}) ? $options->{nf_conntrack_tcp_timeout_established} : 432000;
3519
3520 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established", $value);
3521 }
3522
3523 sub remove_pvefw_chains {
3524
3525 PVE::Firewall::remove_pvefw_chains_iptables("iptables");
3526 PVE::Firewall::remove_pvefw_chains_iptables("ip6tables");
3527 PVE::Firewall::remove_pvefw_chains_ipset();
3528
3529 }
3530
3531 sub remove_pvefw_chains_iptables {
3532 my ($iptablescmd) = @_;
3533
3534 my ($chash, $hooks) = iptables_get_chains($iptablescmd);
3535 my $cmdlist = "*filter\n";
3536
3537 foreach my $h (qw(INPUT OUTPUT FORWARD)) {
3538 if ($hooks->{$h}) {
3539 $cmdlist .= "-D $h -j PVEFW-$h\n";
3540 }
3541 }
3542
3543 foreach my $chain (keys %$chash) {
3544 $cmdlist .= "-F $chain\n";
3545 }
3546
3547 foreach my $chain (keys %$chash) {
3548 $cmdlist .= "-X $chain\n";
3549 }
3550 $cmdlist .= "COMMIT\n";
3551
3552 if($iptablescmd eq "ip6tables") {
3553 ip6tables_restore_cmdlist($cmdlist);
3554 } else {
3555 iptables_restore_cmdlist($cmdlist);
3556 }
3557 }
3558
3559 sub remove_pvefw_chains_ipset {
3560
3561 my $ipset_chains = ipset_get_chains();
3562
3563 my $cmdlist = "";
3564
3565 foreach my $chain (keys %$ipset_chains) {
3566 $cmdlist .= "flush $chain\n";
3567 $cmdlist .= "destroy $chain\n";
3568 }
3569
3570 ipset_restore_cmdlist($cmdlist) if $cmdlist;
3571 }
3572
3573 sub init {
3574 my $cluster_conf = load_clusterfw_conf();
3575 my $cluster_options = $cluster_conf->{options};
3576 my $enable = $cluster_options->{enable};
3577
3578 return if !$enable;
3579
3580 # load required modules here
3581 }
3582
3583 sub update {
3584 my $code = sub {
3585
3586 my $cluster_conf = load_clusterfw_conf();
3587 my $cluster_options = $cluster_conf->{options};
3588
3589 if (!$cluster_options->{enable}) {
3590 PVE::Firewall::remove_pvefw_chains();
3591 return;
3592 }
3593
3594 my $hostfw_conf = load_hostfw_conf($cluster_conf);
3595
3596 my ($ruleset, $ipset_ruleset, $rulesetv6) = compile($cluster_conf, $hostfw_conf);
3597
3598 apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6);
3599 };
3600
3601 run_locked($code);
3602 }
3603
3604 1;
Firewall test scripts