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