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only allow icmp names in the destination port field
[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::LXC
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_lxc;
35 eval {
36 require PVE::LXC;
37 $have_lxc = 1;
38 };
39
40
41 my $pve_fw_status_dir = "/var/lib/pve-firewall";
42
43 mkdir $pve_fw_status_dir; # make sure this exists
44
45 my $security_group_name_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
46 my $ipset_name_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
47 our $ip_alias_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
48
49 my $max_alias_name_length = 64;
50 my $max_ipset_name_length = 64;
51 my $max_group_name_length = 20;
52
53 PVE::JSONSchema::register_format('IPorCIDR', \&pve_verify_ip_or_cidr);
54 sub pve_verify_ip_or_cidr {
55 my ($cidr, $noerr) = @_;
56
57 if ($cidr =~ m!^(?:$IPV6RE|$IPV4RE)(/(\d+))?$!) {
58 return $cidr if Net::IP->new($cidr);
59 return undef if $noerr;
60 die Net::IP::Error() . "\n";
61 }
62 return undef if $noerr;
63 die "value does not look like a valid IP address or CIDR network\n";
64 }
65
66 PVE::JSONSchema::register_format('IPorCIDRorAlias', \&pve_verify_ip_or_cidr_or_alias);
67 sub pve_verify_ip_or_cidr_or_alias {
68 my ($cidr, $noerr) = @_;
69
70 return if $cidr =~ m/^(?:$ip_alias_pattern)$/;
71
72 return pve_verify_ip_or_cidr($cidr, $noerr);
73 }
74
75 PVE::JSONSchema::register_standard_option('ipset-name', {
76 description => "IP set name.",
77 type => 'string',
78 pattern => $ipset_name_pattern,
79 minLength => 2,
80 maxLength => $max_ipset_name_length,
81 });
82
83 PVE::JSONSchema::register_standard_option('pve-fw-alias', {
84 description => "Alias name.",
85 type => 'string',
86 pattern => $ip_alias_pattern,
87 minLength => 2,
88 maxLength => $max_alias_name_length,
89 });
90
91 PVE::JSONSchema::register_standard_option('pve-fw-loglevel' => {
92 description => "Log level.",
93 type => 'string',
94 enum => ['emerg', 'alert', 'crit', 'err', 'warning', 'notice', 'info', 'debug', 'nolog'],
95 optional => 1,
96 });
97
98 PVE::JSONSchema::register_standard_option('pve-security-group-name', {
99 description => "Security Group name.",
100 type => 'string',
101 pattern => $security_group_name_pattern,
102 minLength => 2,
103 maxLength => $max_group_name_length,
104 });
105
106 my $feature_ipset_nomatch = 0;
107 eval {
108 my (undef, undef, $release) = POSIX::uname();
109 if ($release =~ m/^(\d+)\.(\d+)\.\d+-/) {
110 my ($major, $minor) = ($1, $2);
111 $feature_ipset_nomatch = 1 if ($major > 3) ||
112 ($major == 3 && $minor >= 7);
113 }
114
115 };
116
117 my $nodename = PVE::INotify::nodename();
118
119 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
120
121 my $default_log_level = 'nolog'; # avoid logs by default
122
123 my $log_level_hash = {
124 debug => 7,
125 info => 6,
126 notice => 5,
127 warning => 4,
128 err => 3,
129 crit => 2,
130 alert => 1,
131 emerg => 0,
132 };
133
134 # we need to overwrite some macros for ipv6
135 my $pve_ipv6fw_macros = {
136 'Ping' => [
137 { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
138 ],
139 'NeighborDiscovery' => [
140 "IPv6 neighbor solicitation, neighbor and router advertisement",
141 { action => 'PARAM', proto => 'icmpv6', dport => 'router-solicitation' },
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 'Ceph' => [
181 "Ceph Storage Cluster traffic (Ceph Monitors, OSD & MDS Deamons)",
182 { action => 'PARAM', proto => 'tcp', dport => '6789' },
183 { action => 'PARAM', proto => 'tcp', dport => '6800:7300' },
184 ],
185 'CVS' => [
186 "Concurrent Versions System pserver traffic",
187 { action => 'PARAM', proto => 'tcp', dport => '2401' },
188 ],
189 'Citrix' => [
190 "Citrix/ICA traffic (ICA, ICA Browser, CGP)",
191 { action => 'PARAM', proto => 'tcp', dport => '1494' },
192 { action => 'PARAM', proto => 'udp', dport => '1604' },
193 { action => 'PARAM', proto => 'tcp', dport => '2598' },
194 ],
195 'DAAP' => [
196 "Digital Audio Access Protocol traffic (iTunes, Rythmbox daemons)",
197 { action => 'PARAM', proto => 'tcp', dport => '3689' },
198 { action => 'PARAM', proto => 'udp', dport => '3689' },
199 ],
200 'DCC' => [
201 "Distributed Checksum Clearinghouse spam filtering mechanism",
202 { action => 'PARAM', proto => 'tcp', dport => '6277' },
203 ],
204 'DHCPfwd' => [
205 "Forwarded DHCP traffic",
206 { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
207 ],
208 'DNS' => [
209 "Domain Name System traffic (upd and tcp)",
210 { action => 'PARAM', proto => 'udp', dport => '53' },
211 { action => 'PARAM', proto => 'tcp', dport => '53' },
212 ],
213 'Distcc' => [
214 "Distributed Compiler service",
215 { action => 'PARAM', proto => 'tcp', dport => '3632' },
216 ],
217 'FTP' => [
218 "File Transfer Protocol",
219 { action => 'PARAM', proto => 'tcp', dport => '21' },
220 ],
221 'Finger' => [
222 "Finger protocol (RFC 742)",
223 { action => 'PARAM', proto => 'tcp', dport => '79' },
224 ],
225 'GNUnet' => [
226 "GNUnet secure peer-to-peer networking traffic",
227 { action => 'PARAM', proto => 'tcp', dport => '2086' },
228 { action => 'PARAM', proto => 'udp', dport => '2086' },
229 { action => 'PARAM', proto => 'tcp', dport => '1080' },
230 { action => 'PARAM', proto => 'udp', dport => '1080' },
231 ],
232 'GRE' => [
233 "Generic Routing Encapsulation tunneling protocol",
234 { action => 'PARAM', proto => '47' },
235 ],
236 'Git' => [
237 "Git distributed revision control traffic",
238 { action => 'PARAM', proto => 'tcp', dport => '9418' },
239 ],
240 'HKP' => [
241 "OpenPGP HTTP keyserver protocol traffic",
242 { action => 'PARAM', proto => 'tcp', dport => '11371' },
243 ],
244 'HTTP' => [
245 "Hypertext Transfer Protocol (WWW)",
246 { action => 'PARAM', proto => 'tcp', dport => '80' },
247 ],
248 'HTTPS' => [
249 "Hypertext Transfer Protocol (WWW) over SSL",
250 { action => 'PARAM', proto => 'tcp', dport => '443' },
251 ],
252 'ICPV2' => [
253 "Internet Cache Protocol V2 (Squid) traffic",
254 { action => 'PARAM', proto => 'udp', dport => '3130' },
255 ],
256 'ICQ' => [
257 "AOL Instant Messenger traffic",
258 { action => 'PARAM', proto => 'tcp', dport => '5190' },
259 ],
260 'IMAP' => [
261 "Internet Message Access Protocol",
262 { action => 'PARAM', proto => 'tcp', dport => '143' },
263 ],
264 'IMAPS' => [
265 "Internet Message Access Protocol over SSL",
266 { action => 'PARAM', proto => 'tcp', dport => '993' },
267 ],
268 'IPIP' => [
269 "IPIP capsulation traffic",
270 { action => 'PARAM', proto => '94' },
271 ],
272 'IPsec' => [
273 "IPsec traffic",
274 { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
275 { action => 'PARAM', proto => '50' },
276 ],
277 'IPsecah' => [
278 "IPsec authentication (AH) traffic",
279 { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
280 { action => 'PARAM', proto => '51' },
281 ],
282 'IPsecnat' => [
283 "IPsec traffic and Nat-Traversal",
284 { action => 'PARAM', proto => 'udp', dport => '500' },
285 { action => 'PARAM', proto => 'udp', dport => '4500' },
286 { action => 'PARAM', proto => '50' },
287 ],
288 'IRC' => [
289 "Internet Relay Chat traffic",
290 { action => 'PARAM', proto => 'tcp', dport => '6667' },
291 ],
292 'Jetdirect' => [
293 "HP Jetdirect printing",
294 { action => 'PARAM', proto => 'tcp', dport => '9100' },
295 ],
296 'L2TP' => [
297 "Layer 2 Tunneling Protocol traffic",
298 { action => 'PARAM', proto => 'udp', dport => '1701' },
299 ],
300 'LDAP' => [
301 "Lightweight Directory Access Protocol traffic",
302 { action => 'PARAM', proto => 'tcp', dport => '389' },
303 ],
304 'LDAPS' => [
305 "Secure Lightweight Directory Access Protocol traffic",
306 { action => 'PARAM', proto => 'tcp', dport => '636' },
307 ],
308 'MSNP' => [
309 "Microsoft Notification Protocol",
310 { action => 'PARAM', proto => 'tcp', dport => '1863' },
311 ],
312 'MSSQL' => [
313 "Microsoft SQL Server",
314 { action => 'PARAM', proto => 'tcp', dport => '1433' },
315 ],
316 'Mail' => [
317 "Mail traffic (SMTP, SMTPS, Submission)",
318 { action => 'PARAM', proto => 'tcp', dport => '25' },
319 { action => 'PARAM', proto => 'tcp', dport => '465' },
320 { action => 'PARAM', proto => 'tcp', dport => '587' },
321 ],
322 'Munin' => [
323 "Munin networked resource monitoring traffic",
324 { action => 'PARAM', proto => 'tcp', dport => '4949' },
325 ],
326 'MySQL' => [
327 "MySQL server",
328 { action => 'PARAM', proto => 'tcp', dport => '3306' },
329 ],
330 'NNTP' => [
331 "NNTP traffic (Usenet).",
332 { action => 'PARAM', proto => 'tcp', dport => '119' },
333 ],
334 'NNTPS' => [
335 "Encrypted NNTP traffic (Usenet)",
336 { action => 'PARAM', proto => 'tcp', dport => '563' },
337 ],
338 'NTP' => [
339 "Network Time Protocol (ntpd)",
340 { action => 'PARAM', proto => 'udp', dport => '123' },
341 ],
342 'OSPF' => [
343 "OSPF multicast traffic",
344 { action => 'PARAM', proto => '89' },
345 ],
346 'OpenVPN' => [
347 "OpenVPN traffic",
348 { action => 'PARAM', proto => 'udp', dport => '1194' },
349 ],
350 'PCA' => [
351 "Symantec PCAnywere (tm)",
352 { action => 'PARAM', proto => 'udp', dport => '5632' },
353 { action => 'PARAM', proto => 'tcp', dport => '5631' },
354 ],
355 'POP3' => [
356 "POP3 traffic",
357 { action => 'PARAM', proto => 'tcp', dport => '110' },
358 ],
359 'POP3S' => [
360 "Encrypted POP3 traffic",
361 { action => 'PARAM', proto => 'tcp', dport => '995' },
362 ],
363 'PPtP' => [
364 "Point-to-Point Tunneling Protocol",
365 { action => 'PARAM', proto => '47' },
366 { action => 'PARAM', proto => 'tcp', dport => '1723' },
367 ],
368 'Ping' => [
369 "ICMP echo request",
370 { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
371 ],
372 'PostgreSQL' => [
373 "PostgreSQL server",
374 { action => 'PARAM', proto => 'tcp', dport => '5432' },
375 ],
376 'Printer' => [
377 "Line Printer protocol printing",
378 { action => 'PARAM', proto => 'tcp', dport => '515' },
379 ],
380 'RDP' => [
381 "Microsoft Remote Desktop Protocol traffic",
382 { action => 'PARAM', proto => 'tcp', dport => '3389' },
383 ],
384 'RIP' => [
385 "Routing Information Protocol (bidirectional)",
386 { action => 'PARAM', proto => 'udp', dport => '520' },
387 ],
388 'RNDC' => [
389 "BIND remote management protocol",
390 { action => 'PARAM', proto => 'tcp', dport => '953' },
391 ],
392 'Razor' => [
393 "Razor Antispam System",
394 { action => 'ACCEPT', proto => 'tcp', dport => '2703' },
395 ],
396 'Rdate' => [
397 "Remote time retrieval (rdate)",
398 { action => 'PARAM', proto => 'tcp', dport => '37' },
399 ],
400 'Rsync' => [
401 "Rsync server",
402 { action => 'PARAM', proto => 'tcp', dport => '873' },
403 ],
404 'SANE' => [
405 "SANE network scanning",
406 { action => 'PARAM', proto => 'tcp', dport => '6566' },
407 ],
408 'SMB' => [
409 "Microsoft SMB traffic",
410 { action => 'PARAM', proto => 'udp', dport => '135,445' },
411 { action => 'PARAM', proto => 'udp', dport => '137:139' },
412 { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
413 { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
414 ],
415 'SMBswat' => [
416 "Samba Web Administration Tool",
417 { action => 'PARAM', proto => 'tcp', dport => '901' },
418 ],
419 'SMTP' => [
420 "Simple Mail Transfer Protocol",
421 { action => 'PARAM', proto => 'tcp', dport => '25' },
422 ],
423 'SMTPS' => [
424 "Encrypted Simple Mail Transfer Protocol",
425 { action => 'PARAM', proto => 'tcp', dport => '465' },
426 ],
427 'SNMP' => [
428 "Simple Network Management Protocol",
429 { action => 'PARAM', proto => 'udp', dport => '161:162' },
430 { action => 'PARAM', proto => 'tcp', dport => '161' },
431 ],
432 'SPAMD' => [
433 "Spam Assassin SPAMD traffic",
434 { action => 'PARAM', proto => 'tcp', dport => '783' },
435 ],
436 'SSH' => [
437 "Secure shell traffic",
438 { action => 'PARAM', proto => 'tcp', dport => '22' },
439 ],
440 'SVN' => [
441 "Subversion server (svnserve)",
442 { action => 'PARAM', proto => 'tcp', dport => '3690' },
443 ],
444 'SixXS' => [
445 "SixXS IPv6 Deployment and Tunnel Broker",
446 { action => 'PARAM', proto => 'tcp', dport => '3874' },
447 { action => 'PARAM', proto => 'udp', dport => '3740' },
448 { action => 'PARAM', proto => '41' },
449 { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
450 ],
451 'Squid' => [
452 "Squid web proxy traffic",
453 { action => 'PARAM', proto => 'tcp', dport => '3128' },
454 ],
455 'Submission' => [
456 "Mail message submission traffic",
457 { action => 'PARAM', proto => 'tcp', dport => '587' },
458 ],
459 'Syslog' => [
460 "Syslog protocol (RFC 5424) traffic",
461 { action => 'PARAM', proto => 'udp', dport => '514' },
462 { action => 'PARAM', proto => 'tcp', dport => '514' },
463 ],
464 'TFTP' => [
465 "Trivial File Transfer Protocol traffic",
466 { action => 'PARAM', proto => 'udp', dport => '69' },
467 ],
468 'Telnet' => [
469 "Telnet traffic",
470 { action => 'PARAM', proto => 'tcp', dport => '23' },
471 ],
472 'Telnets' => [
473 "Telnet over SSL",
474 { action => 'PARAM', proto => 'tcp', dport => '992' },
475 ],
476 'Time' => [
477 "RFC 868 Time protocol",
478 { action => 'PARAM', proto => 'tcp', dport => '37' },
479 ],
480 'Trcrt' => [
481 "Traceroute (for up to 30 hops) traffic",
482 { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
483 { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
484 ],
485 'VNC' => [
486 "VNC traffic for VNC display's 0 - 99",
487 { action => 'PARAM', proto => 'tcp', dport => '5900:5999' },
488 ],
489 'VNCL' => [
490 "VNC traffic from Vncservers to Vncviewers in listen mode",
491 { action => 'PARAM', proto => 'tcp', dport => '5500' },
492 ],
493 'Web' => [
494 "WWW traffic (HTTP and HTTPS)",
495 { action => 'PARAM', proto => 'tcp', dport => '80' },
496 { action => 'PARAM', proto => 'tcp', dport => '443' },
497 ],
498 'Webcache' => [
499 "Web Cache/Proxy traffic (port 8080)",
500 { action => 'PARAM', proto => 'tcp', dport => '8080' },
501 ],
502 'Webmin' => [
503 "Webmin traffic",
504 { action => 'PARAM', proto => 'tcp', dport => '10000' },
505 ],
506 'Whois' => [
507 "Whois (nicname, RFC 3912) traffic",
508 { action => 'PARAM', proto => 'tcp', dport => '43' },
509 ],
510 };
511
512 my $pve_fw_parsed_macros;
513 my $pve_fw_macro_descr;
514 my $pve_fw_macro_ipversion = {};
515 my $pve_fw_preferred_macro_names = {};
516
517 my $pve_std_chains = {};
518 $pve_std_chains->{4} = {
519 'PVEFW-SET-ACCEPT-MARK' => [
520 "-j MARK --set-mark 1",
521 ],
522 'PVEFW-DropBroadcast' => [
523 # same as shorewall 'Broadcast'
524 # simply DROP BROADCAST/MULTICAST/ANYCAST
525 # we can use this to reduce logging
526 { action => 'DROP', dsttype => 'BROADCAST' },
527 { action => 'DROP', dsttype => 'MULTICAST' },
528 { action => 'DROP', dsttype => 'ANYCAST' },
529 { action => 'DROP', dest => '224.0.0.0/4' },
530 ],
531 'PVEFW-reject' => [
532 # same as shorewall 'reject'
533 { action => 'DROP', dsttype => 'BROADCAST' },
534 { action => 'DROP', source => '224.0.0.0/4' },
535 { action => 'DROP', proto => 'icmp' },
536 "-p tcp -j REJECT --reject-with tcp-reset",
537 "-p udp -j REJECT --reject-with icmp-port-unreachable",
538 "-p icmp -j REJECT --reject-with icmp-host-unreachable",
539 "-j REJECT --reject-with icmp-host-prohibited",
540 ],
541 'PVEFW-Drop' => [
542 # same as shorewall 'Drop', which is equal to DROP,
543 # but REJECT/DROP some packages to reduce logging,
544 # and ACCEPT critical ICMP types
545 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
546 # we are not interested in BROADCAST/MULTICAST/ANYCAST
547 { action => 'PVEFW-DropBroadcast' },
548 # ACCEPT critical ICMP types
549 { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
550 { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
551 # Drop packets with INVALID state
552 "-m conntrack --ctstate INVALID -j DROP",
553 # Drop Microsoft SMB noise
554 { action => 'DROP', proto => 'udp', dport => '135,445', nbdport => 2 },
555 { action => 'DROP', proto => 'udp', dport => '137:139'},
556 { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
557 { action => 'DROP', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
558 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
559 # Drop new/NotSyn traffic so that it doesn't get logged
560 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
561 # Drop DNS replies
562 { action => 'DROP', proto => 'udp', sport => 53 },
563 ],
564 'PVEFW-Reject' => [
565 # same as shorewall 'Reject', which is equal to Reject,
566 # but REJECT/DROP some packages to reduce logging,
567 # and ACCEPT critical ICMP types
568 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
569 # we are not interested in BROADCAST/MULTICAST/ANYCAST
570 { action => 'PVEFW-DropBroadcast' },
571 # ACCEPT critical ICMP types
572 { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
573 { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
574 # Drop packets with INVALID state
575 "-m conntrack --ctstate INVALID -j DROP",
576 # Drop Microsoft SMB noise
577 { action => 'PVEFW-reject', proto => 'udp', dport => '135,445', nbdport => 2 },
578 { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
579 { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
580 { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
581 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
582 # Drop new/NotSyn traffic so that it doesn't get logged
583 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
584 # Drop DNS replies
585 { action => 'DROP', proto => 'udp', sport => 53 },
586 ],
587 'PVEFW-tcpflags' => [
588 # same as shorewall tcpflags action.
589 # Packets arriving on this interface are checked for som illegal combinations of TCP flags
590 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
591 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
592 "-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
593 "-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
594 "-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
595 ],
596 'PVEFW-smurfs' => [
597 # same as shorewall smurfs action
598 # Filter packets for smurfs (packets with a broadcast address as the source).
599 "-s 0.0.0.0/32 -j RETURN", # allow DHCP
600 "-m addrtype --src-type BROADCAST -g PVEFW-smurflog",
601 "-s 224.0.0.0/4 -g PVEFW-smurflog",
602 ],
603 };
604
605 $pve_std_chains->{6} = {
606 'PVEFW-SET-ACCEPT-MARK' => [
607 "-j MARK --set-mark 1",
608 ],
609 'PVEFW-DropBroadcast' => [
610 # same as shorewall 'Broadcast'
611 # simply DROP BROADCAST/MULTICAST/ANYCAST
612 # we can use this to reduce logging
613 #{ action => 'DROP', dsttype => 'BROADCAST' }, #no broadcast in ipv6
614 # ipv6 addrtype does not work with kernel 2.6.32
615 #{ action => 'DROP', dsttype => 'MULTICAST' },
616 #{ action => 'DROP', dsttype => 'ANYCAST' },
617 { action => 'DROP', dest => 'ff00::/8' },
618 #{ action => 'DROP', dest => '224.0.0.0/4' },
619 ],
620 'PVEFW-reject' => [
621 # same as shorewall 'reject'
622 #{ action => 'DROP', dsttype => 'BROADCAST' },
623 #{ action => 'DROP', source => '224.0.0.0/4' },
624 { action => 'DROP', proto => 'icmpv6' },
625 "-p tcp -j REJECT --reject-with tcp-reset",
626 #"-p udp -j REJECT --reject-with icmp-port-unreachable",
627 #"-p icmp -j REJECT --reject-with icmp-host-unreachable",
628 #"-j REJECT --reject-with icmp-host-prohibited",
629 ],
630 'PVEFW-Drop' => [
631 # same as shorewall 'Drop', which is equal to DROP,
632 # but REJECT/DROP some packages to reduce logging,
633 # and ACCEPT critical ICMP types
634 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
635 # we are not interested in BROADCAST/MULTICAST/ANYCAST
636 { action => 'PVEFW-DropBroadcast' },
637 # ACCEPT critical ICMP types
638 { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
639 { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
640 { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
641
642 # Drop packets with INVALID state
643 "-m conntrack --ctstate INVALID -j DROP",
644 # Drop Microsoft SMB noise
645 { action => 'DROP', proto => 'udp', dport => '135,445', nbdport => 2 },
646 { action => 'DROP', proto => 'udp', dport => '137:139'},
647 { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
648 { action => 'DROP', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
649 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
650 # Drop new/NotSyn traffic so that it doesn't get logged
651 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
652 # Drop DNS replies
653 { action => 'DROP', proto => 'udp', sport => 53 },
654 ],
655 'PVEFW-Reject' => [
656 # same as shorewall 'Reject', which is equal to Reject,
657 # but REJECT/DROP some packages to reduce logging,
658 # and ACCEPT critical ICMP types
659 { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
660 # we are not interested in BROADCAST/MULTICAST/ANYCAST
661 { action => 'PVEFW-DropBroadcast' },
662 # ACCEPT critical ICMP types
663 { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
664 { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
665 { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
666
667 # Drop packets with INVALID state
668 "-m conntrack --ctstate INVALID -j DROP",
669 # Drop Microsoft SMB noise
670 { action => 'PVEFW-reject', proto => 'udp', dport => '135,445', nbdport => 2 },
671 { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
672 { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
673 { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
674 { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
675 # Drop new/NotSyn traffic so that it doesn't get logged
676 "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
677 # Drop DNS replies
678 { action => 'DROP', proto => 'udp', sport => 53 },
679 ],
680 'PVEFW-tcpflags' => [
681 # same as shorewall tcpflags action.
682 # Packets arriving on this interface are checked for som illegal combinations of TCP flags
683 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
684 "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
685 "-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
686 "-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
687 "-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
688 ],
689 };
690
691 # iptables -p icmp -h
692 my $icmp_type_names = {
693 any => 1,
694 'echo-reply' => 1,
695 'destination-unreachable' => 1,
696 'network-unreachable' => 1,
697 'host-unreachable' => 1,
698 'protocol-unreachable' => 1,
699 'port-unreachable' => 1,
700 'fragmentation-needed' => 1,
701 'source-route-failed' => 1,
702 'network-unknown' => 1,
703 'host-unknown' => 1,
704 'network-prohibited' => 1,
705 'host-prohibited' => 1,
706 'TOS-network-unreachable' => 1,
707 'TOS-host-unreachable' => 1,
708 'communication-prohibited' => 1,
709 'host-precedence-violation' => 1,
710 'precedence-cutoff' => 1,
711 'source-quench' => 1,
712 'redirect' => 1,
713 'network-redirect' => 1,
714 'host-redirect' => 1,
715 'TOS-network-redirect' => 1,
716 'TOS-host-redirect' => 1,
717 'echo-request' => 1,
718 'router-advertisement' => 1,
719 'router-solicitation' => 1,
720 'time-exceeded' => 1,
721 'ttl-zero-during-transit' => 1,
722 'ttl-zero-during-reassembly' => 1,
723 'parameter-problem' => 1,
724 'ip-header-bad' => 1,
725 'required-option-missing' => 1,
726 'timestamp-request' => 1,
727 'timestamp-reply' => 1,
728 'address-mask-request' => 1,
729 'address-mask-reply' => 1,
730 };
731
732 # ip6tables -p icmpv6 -h
733
734 my $icmpv6_type_names = {
735 'any' => 1,
736 'destination-unreachable' => 1,
737 'no-route' => 1,
738 'communication-prohibited' => 1,
739 'address-unreachable' => 1,
740 'port-unreachable' => 1,
741 'packet-too-big' => 1,
742 'time-exceeded' => 1,
743 'ttl-zero-during-transit' => 1,
744 'ttl-zero-during-reassembly' => 1,
745 'parameter-problem' => 1,
746 'bad-header' => 1,
747 'unknown-header-type' => 1,
748 'unknown-option' => 1,
749 'echo-request' => 1,
750 'echo-reply' => 1,
751 'router-solicitation' => 1,
752 'router-advertisement' => 1,
753 'neighbor-solicitation' => 1,
754 'neighbour-solicitation' => 1,
755 'neighbor-advertisement' => 1,
756 'neighbour-advertisement' => 1,
757 'redirect' => 1,
758 };
759
760 sub init_firewall_macros {
761
762 $pve_fw_parsed_macros = {};
763
764 my $parse = sub {
765 my ($k, $macro) = @_;
766 my $lc_name = lc($k);
767 $pve_fw_macro_ipversion->{$k} = 0;
768 while (!ref($macro->[0])) {
769 my $desc = shift @$macro;
770 if ($desc eq 'ipv4only') {
771 $pve_fw_macro_ipversion->{$k} = 4;
772 } elsif ($desc eq 'ipv6only') {
773 $pve_fw_macro_ipversion->{$k} = 6;
774 } else {
775 $pve_fw_macro_descr->{$k} = $desc;
776 }
777 }
778 $pve_fw_preferred_macro_names->{$lc_name} = $k;
779 $pve_fw_parsed_macros->{$k} = $macro;
780 };
781
782 foreach my $k (keys %$pve_fw_macros) {
783 &$parse($k, $pve_fw_macros->{$k});
784 }
785
786 foreach my $k (keys %$pve_ipv6fw_macros) {
787 next if $pve_fw_parsed_macros->{$k};
788 &$parse($k, $pve_ipv6fw_macros->{$k});
789 $pve_fw_macro_ipversion->{$k} = 6;
790 }
791 }
792
793 init_firewall_macros();
794
795 sub get_macros {
796 return wantarray ? ($pve_fw_parsed_macros, $pve_fw_macro_descr): $pve_fw_parsed_macros;
797 }
798
799 my $etc_services;
800
801 sub get_etc_services {
802
803 return $etc_services if $etc_services;
804
805 my $filename = "/etc/services";
806
807 my $fh = IO::File->new($filename, O_RDONLY);
808 if (!$fh) {
809 warn "unable to read '$filename' - $!\n";
810 return {};
811 }
812
813 my $services = {};
814
815 while (my $line = <$fh>) {
816 chomp ($line);
817 next if $line =~m/^#/;
818 next if ($line =~m/^\s*$/);
819
820 if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp).*$!) {
821 $services->{byid}->{$2}->{name} = $1;
822 $services->{byid}->{$2}->{port} = $2;
823 $services->{byid}->{$2}->{$3} = 1;
824 $services->{byname}->{$1} = $services->{byid}->{$2};
825 }
826 }
827
828 close($fh);
829
830 $etc_services = $services;
831
832
833 return $etc_services;
834 }
835
836 my $etc_protocols;
837
838 sub get_etc_protocols {
839 return $etc_protocols if $etc_protocols;
840
841 my $filename = "/etc/protocols";
842
843 my $fh = IO::File->new($filename, O_RDONLY);
844 if (!$fh) {
845 warn "unable to read '$filename' - $!\n";
846 return {};
847 }
848
849 my $protocols = {};
850
851 while (my $line = <$fh>) {
852 chomp ($line);
853 next if $line =~m/^#/;
854 next if ($line =~m/^\s*$/);
855
856 if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
857 $protocols->{byid}->{$2}->{name} = $1;
858 $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
859 }
860 }
861
862 close($fh);
863
864 # add special case for ICMP v6
865 $protocols->{byid}->{icmpv6}->{name} = "icmpv6";
866 $protocols->{byname}->{icmpv6} = $protocols->{byid}->{icmpv6};
867
868 $etc_protocols = $protocols;
869
870 return $etc_protocols;
871 }
872
873 my $ipv4_mask_hash_localnet = {
874 '255.255.0.0' => 16,
875 '255.255.128.0' => 17,
876 '255.255.192.0' => 18,
877 '255.255.224.0' => 19,
878 '255.255.240.0' => 20,
879 '255.255.248.0' => 21,
880 '255.255.252.0' => 22,
881 '255.255.254.0' => 23,
882 '255.255.255.0' => 24,
883 '255.255.255.128' => 25,
884 '255.255.255.192' => 26,
885 '255.255.255.224' => 27,
886 '255.255.255.240' => 28,
887 '255.255.255.248' => 29,
888 '255.255.255.252' => 30,
889 };
890
891 my $__local_network;
892
893 sub local_network {
894 my ($new_value) = @_;
895
896 $__local_network = $new_value if defined($new_value);
897
898 return $__local_network if defined($__local_network);
899
900 eval {
901 my $nodename = PVE::INotify::nodename();
902
903 my $ip = PVE::Cluster::remote_node_ip($nodename);
904
905 my $testip = Net::IP->new($ip);
906
907 my $isv6 = $testip->version == 6;
908 my $routes = $isv6 ? PVE::ProcFSTools::read_proc_net_ipv6_route()
909 : PVE::ProcFSTools::read_proc_net_route();
910 foreach my $entry (@$routes) {
911 my $mask;
912 if ($isv6) {
913 $mask = $entry->{prefix};
914 } else {
915 $mask = $ipv4_mask_hash_localnet->{$entry->{mask}};
916 next if !defined($mask);
917 }
918 my $cidr = "$entry->{dest}/$mask";
919 my $testnet = Net::IP->new($cidr);
920 if ($testnet->overlaps($testip) == $Net::IP::IP_B_IN_A_OVERLAP) {
921 $__local_network = $cidr;
922 return;
923 }
924 }
925 };
926 warn $@ if $@;
927
928 return $__local_network;
929 }
930
931 # ipset names are limited to 31 characters,
932 # and we use '-v4' or '-v6' to indicate IP versions,
933 # and we use '_swap' suffix for atomic update,
934 # for example PVEFW-${VMID}-${ipset_name}_swap
935
936 my $max_iptables_ipset_name_length = 31 - length("PVEFW-") - length("_swap");
937
938 sub compute_ipset_chain_name {
939 my ($vmid, $ipset_name, $ipversion) = @_;
940
941 $vmid = 0 if !defined($vmid);
942
943 my $id = "$vmid-${ipset_name}-v$ipversion";
944
945 if (length($id) > $max_iptables_ipset_name_length) {
946 $id = PVE::Tools::fnv31a_hex($id);
947 }
948
949 return "PVEFW-$id";
950 }
951
952 sub compute_ipfilter_ipset_name {
953 my ($iface) = @_;
954
955 return "ipfilter-$iface";
956 }
957
958 sub parse_address_list {
959 my ($str) = @_;
960
961 if ($str =~ m/^(\+)(\S+)$/) { # ipset ref
962 die "ipset name too long\n" if length($str) > ($max_ipset_name_length + 1);
963 return;
964 }
965
966 if ($str =~ m/^${ip_alias_pattern}$/) {
967 die "alias name too long\n" if length($str) > $max_alias_name_length;
968 return;
969 }
970
971 my $count = 0;
972 my $iprange = 0;
973 my $ipversion;
974
975 foreach my $elem (split(/,/, $str)) {
976 $count++;
977 my $ip = Net::IP->new($elem);
978 if (!$ip) {
979 my $err = Net::IP::Error();
980 die "invalid IP address: $err\n";
981 }
982 $iprange = 1 if $elem =~ m/-/;
983
984 my $new_ipversion = Net::IP::ip_is_ipv6($ip->ip()) ? 6 : 4;
985
986 die "detected mixed ipv4/ipv6 addresses in address list '$str'\n"
987 if $ipversion && ($new_ipversion != $ipversion);
988
989 $ipversion = $new_ipversion;
990 }
991
992 die "you can't use a range in a list\n" if $iprange && $count > 1;
993
994 return $ipversion;
995 }
996
997 sub parse_port_name_number_or_range {
998 my ($str, $dport) = @_;
999
1000 my $services = PVE::Firewall::get_etc_services();
1001 my $count = 0;
1002 my $icmp_port = 0;
1003
1004 foreach my $item (split(/,/, $str)) {
1005 $count++;
1006 if ($item =~ m/^(\d+):(\d+)$/) {
1007 my ($port1, $port2) = ($1, $2);
1008 die "invalid port '$port1'\n" if $port1 > 65535;
1009 die "invalid port '$port2'\n" if $port2 > 65535;
1010 } elsif ($item =~ m/^(\d+)$/) {
1011 my $port = $1;
1012 die "invalid port '$port'\n" if $port > 65535;
1013 } else {
1014 if ($dport && $icmp_type_names->{$item}) {
1015 $icmp_port = 1;
1016 } elsif ($dport && $icmpv6_type_names->{$item}) {
1017 $icmp_port = 1;
1018 } else {
1019 die "invalid port '$item'\n" if !$services->{byname}->{$item};
1020 }
1021 }
1022 }
1023
1024 die "ICPM ports not allowed in port range\n" if $icmp_port && $count > 1;
1025
1026 return $count;
1027 }
1028
1029 PVE::JSONSchema::register_format('pve-fw-sport-spec', \&pve_fw_verify_sport_spec);
1030 sub pve_fw_verify_sport_spec {
1031 my ($portstr) = @_;
1032
1033 parse_port_name_number_or_range($portstr, 0);
1034
1035 return $portstr;
1036 }
1037
1038 PVE::JSONSchema::register_format('pve-fw-dport-spec', \&pve_fw_verify_dport_spec);
1039 sub pve_fw_verify_dport_spec {
1040 my ($portstr) = @_;
1041
1042 parse_port_name_number_or_range($portstr, 1);
1043
1044 return $portstr;
1045 }
1046
1047 PVE::JSONSchema::register_format('pve-fw-addr-spec', \&pve_fw_verify_addr_spec);
1048 sub pve_fw_verify_addr_spec {
1049 my ($list) = @_;
1050
1051 parse_address_list($list);
1052
1053 return $list;
1054 }
1055
1056 PVE::JSONSchema::register_format('pve-fw-protocol-spec', \&pve_fw_verify_protocol_spec);
1057 sub pve_fw_verify_protocol_spec {
1058 my ($proto) = @_;
1059
1060 my $protocols = get_etc_protocols();
1061
1062 die "unknown protocol '$proto'\n" if $proto &&
1063 !(defined($protocols->{byname}->{$proto}) ||
1064 defined($protocols->{byid}->{$proto}));
1065
1066 return $proto;
1067 }
1068
1069
1070 # helper function for API
1071
1072 sub copy_opject_with_digest {
1073 my ($object) = @_;
1074
1075 my $sha = Digest::SHA->new('sha1');
1076
1077 my $res = {};
1078 foreach my $k (sort keys %$object) {
1079 my $v = $object->{$k};
1080 next if !defined($v);
1081 $res->{$k} = $v;
1082 $sha->add($k, ':', $v, "\n");
1083 }
1084
1085 my $digest = $sha->hexdigest;
1086
1087 $res->{digest} = $digest;
1088
1089 return wantarray ? ($res, $digest) : $res;
1090 }
1091
1092 sub copy_list_with_digest {
1093 my ($list) = @_;
1094
1095 my $sha = Digest::SHA->new('sha1');
1096
1097 my $res = [];
1098 foreach my $entry (@$list) {
1099 my $data = {};
1100 foreach my $k (sort keys %$entry) {
1101 my $v = $entry->{$k};
1102 next if !defined($v);
1103 $data->{$k} = $v;
1104 # Note: digest ignores refs ($rule->{errors})
1105 # since Digest::SHA expects a series of bytes,
1106 # we have to encode the value here to prevent errors when
1107 # using utf8 characters (eg. in comments)
1108 $sha->add($k, ':', encode_utf8($v), "\n") if !ref($v); ;
1109 }
1110 push @$res, $data;
1111 }
1112
1113 my $digest = $sha->hexdigest;
1114
1115 foreach my $entry (@$res) {
1116 $entry->{digest} = $digest;
1117 }
1118
1119 return wantarray ? ($res, $digest) : $res;
1120 }
1121
1122 my $rule_properties = {
1123 pos => {
1124 description => "Update rule at position <pos>.",
1125 type => 'integer',
1126 minimum => 0,
1127 optional => 1,
1128 },
1129 digest => get_standard_option('pve-config-digest'),
1130 type => {
1131 type => 'string',
1132 optional => 1,
1133 enum => ['in', 'out', 'group'],
1134 },
1135 action => {
1136 description => "Rule action ('ACCEPT', 'DROP', 'REJECT') or security group name.",
1137 type => 'string',
1138 optional => 1,
1139 pattern => $security_group_name_pattern,
1140 maxLength => 20,
1141 minLength => 2,
1142 },
1143 macro => {
1144 type => 'string',
1145 optional => 1,
1146 maxLength => 128,
1147 },
1148 iface => get_standard_option('pve-iface', { optional => 1 }),
1149 source => {
1150 type => 'string', format => 'pve-fw-addr-spec',
1151 optional => 1,
1152 },
1153 dest => {
1154 type => 'string', format => 'pve-fw-addr-spec',
1155 optional => 1,
1156 },
1157 proto => {
1158 type => 'string', format => 'pve-fw-protocol-spec',
1159 optional => 1,
1160 },
1161 enable => {
1162 type => 'integer',
1163 minimum => 0,
1164 optional => 1,
1165 },
1166 sport => {
1167 type => 'string', format => 'pve-fw-sport-spec',
1168 optional => 1,
1169 },
1170 dport => {
1171 type => 'string', format => 'pve-fw-dport-spec',
1172 optional => 1,
1173 },
1174 comment => {
1175 type => 'string',
1176 optional => 1,
1177 },
1178 };
1179
1180 sub add_rule_properties {
1181 my ($properties) = @_;
1182
1183 foreach my $k (keys %$rule_properties) {
1184 my $h = $rule_properties->{$k};
1185 # copy data, so that we can modify later without side effects
1186 foreach my $opt (keys %$h) { $properties->{$k}->{$opt} = $h->{$opt}; }
1187 }
1188
1189 return $properties;
1190 }
1191
1192 sub delete_rule_properties {
1193 my ($rule, $delete_str) = @_;
1194
1195 foreach my $opt (PVE::Tools::split_list($delete_str)) {
1196 raise_param_exc({ 'delete' => "no such property ('$opt')"})
1197 if !defined($rule_properties->{$opt});
1198 raise_param_exc({ 'delete' => "unable to delete required property '$opt'"})
1199 if $opt eq 'type' || $opt eq 'action';
1200 delete $rule->{$opt};
1201 }
1202
1203 return $rule;
1204 }
1205
1206 my $apply_macro = sub {
1207 my ($macro_name, $param, $verify, $ipversion) = @_;
1208
1209 my $macro_rules = $pve_fw_parsed_macros->{$macro_name};
1210 die "unknown macro '$macro_name'\n" if !$macro_rules; # should not happen
1211
1212 if ($ipversion && ($ipversion == 6) && $pve_ipv6fw_macros->{$macro_name}) {
1213 $macro_rules = $pve_ipv6fw_macros->{$macro_name};
1214 }
1215
1216 # skip macros which are specific to another ipversion
1217 if ($ipversion && (my $required = $pve_fw_macro_ipversion->{$macro_name})) {
1218 return if $ipversion != $required;
1219 }
1220
1221 my $rules = [];
1222
1223 foreach my $templ (@$macro_rules) {
1224 my $rule = {};
1225 my $param_used = {};
1226 foreach my $k (keys %$templ) {
1227 my $v = $templ->{$k};
1228 if ($v eq 'PARAM') {
1229 $v = $param->{$k};
1230 $param_used->{$k} = 1;
1231 } elsif ($v eq 'DEST') {
1232 $v = $param->{dest};
1233 $param_used->{dest} = 1;
1234 } elsif ($v eq 'SOURCE') {
1235 $v = $param->{source};
1236 $param_used->{source} = 1;
1237 }
1238
1239 if (!defined($v)) {
1240 my $msg = "missing parameter '$k' in macro '$macro_name'";
1241 raise_param_exc({ macro => $msg }) if $verify;
1242 die "$msg\n";
1243 }
1244 $rule->{$k} = $v;
1245 }
1246 foreach my $k (keys %$param) {
1247 next if $k eq 'macro';
1248 next if !defined($param->{$k});
1249 next if $param_used->{$k};
1250 if (defined($rule->{$k})) {
1251 if ($rule->{$k} ne $param->{$k}) {
1252 my $msg = "parameter '$k' already define in macro (value = '$rule->{$k}')";
1253 raise_param_exc({ $k => $msg }) if $verify;
1254 die "$msg\n";
1255 }
1256 } else {
1257 $rule->{$k} = $param->{$k};
1258 }
1259 }
1260 push @$rules, $rule;
1261 }
1262
1263 return $rules;
1264 };
1265
1266 my $rule_env_iface_lookup = {
1267 'ct' => 1,
1268 'vm' => 1,
1269 'group' => 0,
1270 'cluster' => 1,
1271 'host' => 1,
1272 };
1273
1274 sub verify_rule {
1275 my ($rule, $cluster_conf, $fw_conf, $rule_env, $noerr) = @_;
1276
1277 my $allow_groups = $rule_env eq 'group' ? 0 : 1;
1278
1279 my $allow_iface = $rule_env_iface_lookup->{$rule_env};
1280 die "unknown rule_env '$rule_env'\n" if !defined($allow_iface); # should not happen
1281
1282 my $errors = $rule->{errors} || {};
1283
1284 my $error_count = 0;
1285
1286 my $add_error = sub {
1287 my ($param, $msg) = @_;
1288 chomp $msg;
1289 raise_param_exc({ $param => $msg }) if !$noerr;
1290 $error_count++;
1291 $errors->{$param} = $msg if !$errors->{$param};
1292 };
1293
1294 my $ipversion;
1295 my $set_ip_version = sub {
1296 my $vers = shift;
1297 if ($vers) {
1298 die "detected mixed ipv4/ipv6 adresses in rule\n"
1299 if $ipversion && ($vers != $ipversion);
1300 $ipversion = $vers;
1301 }
1302 };
1303
1304 my $check_ipset_or_alias_property = sub {
1305 my ($name, $expected_ipversion) = @_;
1306
1307 if (my $value = $rule->{$name}) {
1308 if ($value =~ m/^\+/) {
1309 if ($value =~ m/^\+(${ipset_name_pattern})$/) {
1310 &$add_error($name, "no such ipset '$1'")
1311 if !($cluster_conf->{ipset}->{$1} || ($fw_conf && $fw_conf->{ipset}->{$1}));
1312
1313 } else {
1314 &$add_error($name, "invalid ipset name '$value'");
1315 }
1316 } elsif ($value =~ m/^${ip_alias_pattern}$/){
1317 my $alias = lc($value);
1318 &$add_error($name, "no such alias '$value'")
1319 if !($cluster_conf->{aliases}->{$alias} || ($fw_conf && $fw_conf->{aliases}->{$alias}));
1320 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1321 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1322
1323 &$set_ip_version($e->{ipversion});
1324 }
1325 }
1326 };
1327
1328 my $type = $rule->{type};
1329 my $action = $rule->{action};
1330
1331 &$add_error('type', "missing property") if !$type;
1332 &$add_error('action', "missing property") if !$action;
1333
1334 if ($type) {
1335 if ($type eq 'in' || $type eq 'out') {
1336 &$add_error('action', "unknown action '$action'")
1337 if $action && ($action !~ m/^(ACCEPT|DROP|REJECT)$/);
1338 } elsif ($type eq 'group') {
1339 &$add_error('type', "security groups not allowed")
1340 if !$allow_groups;
1341 &$add_error('action', "invalid characters in security group name")
1342 if $action && ($action !~ m/^${security_group_name_pattern}$/);
1343 } else {
1344 &$add_error('type', "unknown rule type '$type'");
1345 }
1346 }
1347
1348 if ($rule->{iface}) {
1349 &$add_error('type', "parameter -i not allowed for this rule type")
1350 if !$allow_iface;
1351 eval { PVE::JSONSchema::pve_verify_iface($rule->{iface}); };
1352 &$add_error('iface', $@) if $@;
1353 if ($rule_env eq 'vm' || $rule_env eq 'ct') {
1354 &$add_error('iface', "value does not match the regex pattern 'net\\d+'")
1355 if $rule->{iface} !~ m/^net(\d+)$/;
1356 }
1357 }
1358
1359 if ($rule->{macro}) {
1360 if (my $preferred_name = $pve_fw_preferred_macro_names->{lc($rule->{macro})}) {
1361 $rule->{macro} = $preferred_name;
1362 } else {
1363 &$add_error('macro', "unknown macro '$rule->{macro}'");
1364 }
1365 }
1366
1367 if ($rule->{proto}) {
1368 eval { pve_fw_verify_protocol_spec($rule->{proto}); };
1369 &$add_error('proto', $@) if $@;
1370 &$set_ip_version(4) if $rule->{proto} eq 'icmp';
1371 &$set_ip_version(6) if $rule->{proto} eq 'icmpv6';
1372 }
1373
1374 if ($rule->{dport}) {
1375 eval { parse_port_name_number_or_range($rule->{dport}, 1); };
1376 &$add_error('dport', $@) if $@;
1377 &$add_error('proto', "missing property - 'dport' requires this property")
1378 if !$rule->{proto};
1379 }
1380
1381 if ($rule->{sport}) {
1382 eval { parse_port_name_number_or_range($rule->{sport}, 0); };
1383 &$add_error('sport', $@) if $@;
1384 &$add_error('proto', "missing property - 'sport' requires this property")
1385 if !$rule->{proto};
1386 }
1387
1388 if ($rule->{source}) {
1389 eval {
1390 my $source_ipversion = parse_address_list($rule->{source});
1391 &$set_ip_version($source_ipversion);
1392 };
1393 &$add_error('source', $@) if $@;
1394 &$check_ipset_or_alias_property('source', $ipversion);
1395 }
1396
1397 if ($rule->{dest}) {
1398 eval {
1399 my $dest_ipversion = parse_address_list($rule->{dest});
1400 &$set_ip_version($dest_ipversion);
1401 };
1402 &$add_error('dest', $@) if $@;
1403 &$check_ipset_or_alias_property('dest', $ipversion);
1404 }
1405
1406 $rule->{ipversion} = $ipversion if $ipversion;
1407
1408 if ($rule->{macro} && !$error_count) {
1409 eval { &$apply_macro($rule->{macro}, $rule, 1, $ipversion); };
1410 if (my $err = $@) {
1411 if (ref($err) eq "PVE::Exception" && $err->{errors}) {
1412 my $eh = $err->{errors};
1413 foreach my $p (keys %$eh) {
1414 &$add_error($p, $eh->{$p});
1415 }
1416 } else {
1417 &$add_error('macro', "$err");
1418 }
1419 }
1420 }
1421
1422 $rule->{errors} = $errors if $error_count;
1423
1424 return $rule;
1425 }
1426
1427 sub copy_rule_data {
1428 my ($rule, $param) = @_;
1429
1430 foreach my $k (keys %$rule_properties) {
1431 if (defined(my $v = $param->{$k})) {
1432 if ($v eq '' || $v eq '-') {
1433 delete $rule->{$k};
1434 } else {
1435 $rule->{$k} = $v;
1436 }
1437 }
1438 }
1439
1440 return $rule;
1441 }
1442
1443 sub rules_modify_permissions {
1444 my ($rule_env) = @_;
1445
1446 if ($rule_env eq 'host') {
1447 return {
1448 check => ['perm', '/nodes/{node}', [ 'Sys.Modify' ]],
1449 };
1450 } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1451 return {
1452 check => ['perm', '/', [ 'Sys.Modify' ]],
1453 };
1454 } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1455 return {
1456 check => ['perm', '/vms/{vmid}', [ 'VM.Config.Network' ]],
1457 }
1458 }
1459
1460 return undef;
1461 }
1462
1463 sub rules_audit_permissions {
1464 my ($rule_env) = @_;
1465
1466 if ($rule_env eq 'host') {
1467 return {
1468 check => ['perm', '/nodes/{node}', [ 'Sys.Audit' ]],
1469 };
1470 } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1471 return {
1472 check => ['perm', '/', [ 'Sys.Audit' ]],
1473 };
1474 } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1475 return {
1476 check => ['perm', '/vms/{vmid}', [ 'VM.Audit' ]],
1477 }
1478 }
1479
1480 return undef;
1481 }
1482
1483 # core functions
1484 my $bridge_firewall_enabled = 0;
1485
1486 sub enable_bridge_firewall {
1487
1488 return if $bridge_firewall_enabled; # only once
1489
1490 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
1491 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
1492
1493 # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
1494 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
1495
1496 $bridge_firewall_enabled = 1;
1497 }
1498
1499 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
1500
1501 sub iptables_restore_cmdlist {
1502 my ($cmdlist) = @_;
1503
1504 run_command("/sbin/iptables-restore -n", input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1505 }
1506
1507 sub ip6tables_restore_cmdlist {
1508 my ($cmdlist) = @_;
1509
1510 run_command("/sbin/ip6tables-restore -n", input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1511 }
1512
1513 sub ipset_restore_cmdlist {
1514 my ($cmdlist) = @_;
1515
1516 run_command("/sbin/ipset restore", input => $cmdlist, errmsg => "ipset_restore_cmdlist");
1517 }
1518
1519 sub iptables_get_chains {
1520 my ($iptablescmd) = @_;
1521
1522 $iptablescmd = "iptables" if !$iptablescmd;
1523
1524 my $res = {};
1525
1526 # check what chains we want to track
1527 my $is_pvefw_chain = sub {
1528 my $name = shift;
1529
1530 return 1 if $name =~ m/^PVEFW-\S+$/;
1531
1532 return 1 if $name =~ m/^tap\d+i\d+-(?:IN|OUT)$/;
1533
1534 return 1 if $name =~ m/^veth\d+i\d+-(?:IN|OUT)$/;
1535
1536 return 1 if $name =~ m/^fwbr\d+(v\d+)?-(?:FW|IN|OUT|IPS)$/;
1537 return 1 if $name =~ m/^GROUP-(?:$security_group_name_pattern)-(?:IN|OUT)$/;
1538
1539 return undef;
1540 };
1541
1542 my $table = '';
1543
1544 my $hooks = {};
1545
1546 my $parser = sub {
1547 my $line = shift;
1548
1549 return if $line =~ m/^#/;
1550 return if $line =~ m/^\s*$/;
1551
1552 if ($line =~ m/^\*(\S+)$/) {
1553 $table = $1;
1554 return;
1555 }
1556
1557 return if $table ne 'filter';
1558
1559 if ($line =~ m/^:(\S+)\s/) {
1560 my $chain = $1;
1561 return if !&$is_pvefw_chain($chain);
1562 $res->{$chain} = "unknown";
1563 } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
1564 my ($chain, $sig) = ($1, $2);
1565 return if !&$is_pvefw_chain($chain);
1566 $res->{$chain} = $sig;
1567 } elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD)\s+-j\s+PVEFW-\1$/) {
1568 $hooks->{$1} = 1;
1569 } else {
1570 # simply ignore the rest
1571 return;
1572 }
1573 };
1574
1575 run_command("/sbin/$iptablescmd-save", outfunc => $parser);
1576
1577 return wantarray ? ($res, $hooks) : $res;
1578 }
1579
1580 sub iptables_chain_digest {
1581 my ($rules) = @_;
1582 my $digest = Digest::SHA->new('sha1');
1583 foreach my $rule (@$rules) { # order is important
1584 $digest->add($rule);
1585 }
1586 return $digest->b64digest;
1587 }
1588
1589 sub ipset_chain_digest {
1590 my ($rules) = @_;
1591
1592 my $digest = Digest::SHA->new('sha1');
1593 foreach my $rule (sort @$rules) { # note: sorted
1594 $digest->add($rule);
1595 }
1596 return $digest->b64digest;
1597 }
1598
1599 sub ipset_get_chains {
1600
1601 my $res = {};
1602 my $chains = {};
1603
1604 my $parser = sub {
1605 my $line = shift;
1606
1607 return if $line =~ m/^#/;
1608 return if $line =~ m/^\s*$/;
1609 if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
1610 my $chain = $1;
1611 $line =~ s/\s+$//; # delete trailing white space
1612 push @{$chains->{$chain}}, $line;
1613 } else {
1614 # simply ignore the rest
1615 return;
1616 }
1617 };
1618
1619 run_command("/sbin/ipset save", outfunc => $parser);
1620
1621 # compute digest for each chain
1622 foreach my $chain (keys %$chains) {
1623 $res->{$chain} = ipset_chain_digest($chains->{$chain});
1624 }
1625
1626 return $res;
1627 }
1628
1629 sub ruleset_generate_cmdstr {
1630 my ($ruleset, $chain, $ipversion, $rule, $actions, $goto, $cluster_conf, $fw_conf) = @_;
1631
1632 return if defined($rule->{enable}) && !$rule->{enable};
1633 return if $rule->{errors};
1634
1635 die "unable to emit macro - internal error" if $rule->{macro}; # should not happen
1636
1637 my $nbdport = defined($rule->{dport}) ? parse_port_name_number_or_range($rule->{dport}, 1) : 0;
1638 my $nbsport = defined($rule->{sport}) ? parse_port_name_number_or_range($rule->{sport}, 0) : 0;
1639
1640 my @cmd = ();
1641
1642 push @cmd, "-i $rule->{iface_in}" if $rule->{iface_in};
1643 push @cmd, "-o $rule->{iface_out}" if $rule->{iface_out};
1644
1645 my $source = $rule->{source};
1646 my $dest = $rule->{dest};
1647
1648 if ($source) {
1649 if ($source =~ m/^\+/) {
1650 if ($source =~ m/^\+(${ipset_name_pattern})$/) {
1651 my $name = $1;
1652 if ($fw_conf && $fw_conf->{ipset}->{$name}) {
1653 my $ipset_chain = compute_ipset_chain_name($fw_conf->{vmid}, $name, $ipversion);
1654 push @cmd, "-m set --match-set ${ipset_chain} src";
1655 } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
1656 my $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
1657 push @cmd, "-m set --match-set ${ipset_chain} src";
1658 } else {
1659 die "no such ipset '$name'\n";
1660 }
1661 } else {
1662 die "invalid security group name '$source'\n";
1663 }
1664 } elsif ($source =~ m/^${ip_alias_pattern}$/){
1665 my $alias = lc($source);
1666 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1667 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1668 die "no such alias '$source'\n" if !$e;
1669 push @cmd, "-s $e->{cidr}";
1670 } elsif ($source =~ m/\-/){
1671 push @cmd, "-m iprange --src-range $source";
1672 } else {
1673 push @cmd, "-s $source";
1674 }
1675 }
1676
1677 if ($dest) {
1678 if ($dest =~ m/^\+/) {
1679 if ($dest =~ m/^\+(${ipset_name_pattern})$/) {
1680 my $name = $1;
1681 if ($fw_conf && $fw_conf->{ipset}->{$name}) {
1682 my $ipset_chain = compute_ipset_chain_name($fw_conf->{vmid}, $name, $ipversion);
1683 push @cmd, "-m set --match-set ${ipset_chain} dst";
1684 } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
1685 my $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
1686 push @cmd, "-m set --match-set ${ipset_chain} dst";
1687 } else {
1688 die "no such ipset '$name'\n";
1689 }
1690 } else {
1691 die "invalid security group name '$dest'\n";
1692 }
1693 } elsif ($dest =~ m/^${ip_alias_pattern}$/){
1694 my $alias = lc($dest);
1695 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1696 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1697 die "no such alias '$dest'\n" if !$e;
1698 push @cmd, "-d $e->{cidr}";
1699 } elsif ($dest =~ m/^(\d+)\.(\d+).(\d+).(\d+)\-(\d+)\.(\d+).(\d+).(\d+)$/){
1700 push @cmd, "-m iprange --dst-range $dest";
1701 } else {
1702 push @cmd, "-d $dest";
1703 }
1704 }
1705
1706 if ($rule->{proto}) {
1707 push @cmd, "-p $rule->{proto}";
1708
1709 my $multiport = 0;
1710 $multiport++ if $nbdport > 1;
1711 $multiport++ if $nbsport > 1;
1712
1713 push @cmd, "--match multiport" if $multiport;
1714
1715 die "multiport: option '--sports' cannot be used together with '--dports'\n"
1716 if ($multiport == 2) && ($rule->{dport} ne $rule->{sport});
1717
1718 if ($rule->{dport}) {
1719 if ($rule->{proto} && $rule->{proto} eq 'icmp') {
1720 # Note: we use dport to store --icmp-type
1721 die "unknown icmp-type '$rule->{dport}'\n"
1722 if $rule->{dport} !~ /^\d+$/ && !defined($icmp_type_names->{$rule->{dport}});
1723 push @cmd, "-m icmp --icmp-type $rule->{dport}";
1724 } elsif ($rule->{proto} && $rule->{proto} eq 'icmpv6') {
1725 # Note: we use dport to store --icmpv6-type
1726 die "unknown icmpv6-type '$rule->{dport}'\n"
1727 if $rule->{dport} !~ /^\d+$/ && !defined($icmpv6_type_names->{$rule->{dport}});
1728 push @cmd, "-m icmpv6 --icmpv6-type $rule->{dport}";
1729 } else {
1730 if ($nbdport > 1) {
1731 if ($multiport == 2) {
1732 push @cmd, "--ports $rule->{dport}";
1733 } else {
1734 push @cmd, "--dports $rule->{dport}";
1735 }
1736 } else {
1737 push @cmd, "--dport $rule->{dport}";
1738 }
1739 }
1740 }
1741
1742 if ($rule->{sport}) {
1743 if ($nbsport > 1) {
1744 push @cmd, "--sports $rule->{sport}" if $multiport != 2;
1745 } else {
1746 push @cmd, "--sport $rule->{sport}";
1747 }
1748 }
1749 } elsif ($rule->{dport} || $rule->{sport}) {
1750 die "destination port '$rule->{dport}', but no protocol specified\n" if $rule->{dport};
1751 die "source port '$rule->{sport}', but no protocol specified\n" if $rule->{sport};
1752 }
1753
1754 push @cmd, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
1755
1756 if (my $action = $rule->{action}) {
1757 $action = $actions->{$action} if defined($actions->{$action});
1758 $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
1759 push @cmd, $goto ? "-g $action" : "-j $action";
1760 }
1761
1762 return scalar(@cmd) ? join(' ', @cmd) : undef;
1763 }
1764
1765 sub ruleset_generate_rule {
1766 my ($ruleset, $chain, $ipversion, $rule, $actions, $goto, $cluster_conf, $fw_conf) = @_;
1767
1768 my $rules;
1769
1770 if ($rule->{macro}) {
1771 $rules = &$apply_macro($rule->{macro}, $rule, 0, $ipversion);
1772 } else {
1773 $rules = [ $rule ];
1774 }
1775
1776 # update all or nothing
1777
1778 my @cmds = ();
1779 foreach my $tmp (@$rules) {
1780 if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $ipversion, $tmp, $actions, $goto, $cluster_conf, $fw_conf)) {
1781 push @cmds, $cmdstr;
1782 }
1783 }
1784
1785 foreach my $cmdstr (@cmds) {
1786 ruleset_addrule($ruleset, $chain, $cmdstr);
1787 }
1788 }
1789
1790 sub ruleset_generate_rule_insert {
1791 my ($ruleset, $chain, $ipversion, $rule, $actions, $goto) = @_;
1792
1793 die "implement me" if $rule->{macro}; # not implemented, because not needed so far
1794
1795 if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $ipversion, $rule, $actions, $goto)) {
1796 ruleset_insertrule($ruleset, $chain, $cmdstr);
1797 }
1798 }
1799
1800 sub ruleset_create_chain {
1801 my ($ruleset, $chain) = @_;
1802
1803 die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
1804 die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
1805
1806 die "chain '$chain' already exists\n" if $ruleset->{$chain};
1807
1808 $ruleset->{$chain} = [];
1809 }
1810
1811 sub ruleset_chain_exist {
1812 my ($ruleset, $chain) = @_;
1813
1814 return $ruleset->{$chain} ? 1 : undef;
1815 }
1816
1817 sub ruleset_addrule {
1818 my ($ruleset, $chain, $rule) = @_;
1819
1820 die "no such chain '$chain'\n" if !$ruleset->{$chain};
1821
1822 push @{$ruleset->{$chain}}, "-A $chain $rule";
1823 }
1824
1825 sub ruleset_insertrule {
1826 my ($ruleset, $chain, $rule) = @_;
1827
1828 die "no such chain '$chain'\n" if !$ruleset->{$chain};
1829
1830 unshift @{$ruleset->{$chain}}, "-A $chain $rule";
1831 }
1832
1833 sub get_log_rule_base {
1834 my ($chain, $vmid, $msg, $loglevel) = @_;
1835
1836 die "internal error - no log level" if !defined($loglevel);
1837
1838 $vmid = 0 if !defined($vmid);
1839
1840 # Note: we use special format for prefix to pass further
1841 # info to log daemon (VMID, LOGVELEL and CHAIN)
1842
1843 return "-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
1844 }
1845
1846 sub ruleset_addlog {
1847 my ($ruleset, $chain, $vmid, $msg, $loglevel, $rule) = @_;
1848
1849 return if !defined($loglevel);
1850
1851 my $logrule = get_log_rule_base($chain, $vmid, $msg, $loglevel);
1852
1853 $logrule = "$rule $logrule" if defined($rule);
1854
1855 ruleset_addrule($ruleset, $chain, $logrule);
1856 }
1857
1858 sub ruleset_add_chain_policy {
1859 my ($ruleset, $chain, $ipversion, $vmid, $policy, $loglevel, $accept_action) = @_;
1860
1861 if ($policy eq 'ACCEPT') {
1862
1863 ruleset_generate_rule($ruleset, $chain, $ipversion, { action => 'ACCEPT' },
1864 { ACCEPT => $accept_action});
1865
1866 } elsif ($policy eq 'DROP') {
1867
1868 ruleset_addrule($ruleset, $chain, "-j PVEFW-Drop");
1869
1870 ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
1871
1872 ruleset_addrule($ruleset, $chain, "-j DROP");
1873 } elsif ($policy eq 'REJECT') {
1874 ruleset_addrule($ruleset, $chain, "-j PVEFW-Reject");
1875
1876 ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
1877
1878 ruleset_addrule($ruleset, $chain, "-g PVEFW-reject");
1879 } else {
1880 # should not happen
1881 die "internal error: unknown policy '$policy'";
1882 }
1883 }
1884
1885 sub ruleset_chain_add_ndp {
1886 my ($ruleset, $chain, $ipversion, $options, $direction) = @_;
1887 return if $ipversion != 6 || (defined($options->{ndp}) && !$options->{ndp});
1888
1889 ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-solicitation -j ACCEPT");
1890 if ($direction ne 'OUT' || $options->{radv}) {
1891 ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement -j ACCEPT");
1892 }
1893 ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-solicitation -j ACCEPT");
1894 ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-advertisement -j ACCEPT");
1895 }
1896
1897 sub ruleset_chain_add_conn_filters {
1898 my ($ruleset, $chain, $accept) = @_;
1899
1900 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1901 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j $accept");
1902 }
1903
1904 sub ruleset_chain_add_input_filters {
1905 my ($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel) = @_;
1906
1907 if ($cluster_conf->{ipset}->{blacklist}){
1908 if (!ruleset_chain_exist($ruleset, "PVEFW-blacklist")) {
1909 ruleset_create_chain($ruleset, "PVEFW-blacklist");
1910 ruleset_addlog($ruleset, "PVEFW-blacklist", 0, "DROP: ", $loglevel) if $loglevel;
1911 ruleset_addrule($ruleset, "PVEFW-blacklist", "-j DROP");
1912 }
1913 my $ipset_chain = compute_ipset_chain_name(0, 'blacklist', $ipversion);
1914 ruleset_addrule($ruleset, $chain, "-m set --match-set ${ipset_chain} src -j PVEFW-blacklist");
1915 }
1916
1917 if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
1918 if ($ipversion == 4) {
1919 ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
1920 }
1921 }
1922
1923 if ($options->{tcpflags}) {
1924 ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
1925 }
1926 }
1927
1928 sub ruleset_create_vm_chain {
1929 my ($ruleset, $chain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction) = @_;
1930
1931 ruleset_create_chain($ruleset, $chain);
1932 my $accept = generate_nfqueue($options);
1933
1934 if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
1935 if ($ipversion == 4) {
1936 if ($direction eq 'OUT') {
1937 ruleset_generate_rule($ruleset, $chain, $ipversion,
1938 { action => 'PVEFW-SET-ACCEPT-MARK',
1939 proto => 'udp', sport => 68, dport => 67 });
1940 } else {
1941 ruleset_generate_rule($ruleset, $chain, $ipversion,
1942 { action => 'ACCEPT',
1943 proto => 'udp', sport => 67, dport => 68 });
1944 }
1945 } elsif ($ipversion == 6) {
1946 if ($direction eq 'OUT') {
1947 ruleset_generate_rule($ruleset, $chain, $ipversion,
1948 { action => 'PVEFW-SET-ACCEPT-MARK',
1949 proto => 'udp', sport => 546, dport => 547 });
1950 } else {
1951 ruleset_generate_rule($ruleset, $chain, $ipversion,
1952 { action => 'ACCEPT',
1953 proto => 'udp', sport => 547, dport => 546 });
1954 }
1955 }
1956
1957 }
1958
1959 ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, $direction);
1960
1961 if ($direction eq 'OUT') {
1962 if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
1963 ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr -j DROP");
1964 }
1965 if ($ipversion == 6 && !$options->{radv}) {
1966 ruleset_addrule($ruleset, $chain, '-p icmpv6 --icmpv6-type router-advertisement -j DROP');
1967 }
1968 if ($ipfilter_ipset) {
1969 ruleset_addrule($ruleset, $chain, "-m set ! --match-set $ipfilter_ipset src -j DROP");
1970 }
1971 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1972 }
1973 }
1974
1975 sub ruleset_add_group_rule {
1976 my ($ruleset, $cluster_conf, $chain, $rule, $direction, $action, $ipversion) = @_;
1977
1978 my $group = $rule->{action};
1979 my $group_chain = "GROUP-$group-$direction";
1980 if(!ruleset_chain_exist($ruleset, $group_chain)){
1981 generate_group_rules($ruleset, $cluster_conf, $group, $ipversion);
1982 }
1983
1984 if ($direction eq 'OUT' && $rule->{iface_out}) {
1985 ruleset_addrule($ruleset, $chain, "-o $rule->{iface_out} -j $group_chain");
1986 } elsif ($direction eq 'IN' && $rule->{iface_in}) {
1987 ruleset_addrule($ruleset, $chain, "-i $rule->{iface_in} -j $group_chain");
1988 } else {
1989 ruleset_addrule($ruleset, $chain, "-j $group_chain");
1990 }
1991
1992 ruleset_addrule($ruleset, $chain, "-m mark --mark 1 -j $action");
1993 }
1994
1995 sub ruleset_generate_vm_rules {
1996 my ($ruleset, $rules, $cluster_conf, $vmfw_conf, $chain, $netid, $direction, $options, $ipversion) = @_;
1997
1998 my $lc_direction = lc($direction);
1999
2000 my $in_accept = generate_nfqueue($options);
2001
2002 foreach my $rule (@$rules) {
2003 next if $rule->{iface} && $rule->{iface} ne $netid;
2004 next if !$rule->{enable} || $rule->{errors};
2005 next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2006
2007 if ($rule->{type} eq 'group') {
2008 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, $direction,
2009 $direction eq 'OUT' ? 'RETURN' : $in_accept, $ipversion);
2010 } else {
2011 next if $rule->{type} ne $lc_direction;
2012 eval {
2013 if ($direction eq 'OUT') {
2014 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
2015 { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" },
2016 undef, $cluster_conf, $vmfw_conf);
2017 } else {
2018 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
2019 { ACCEPT => $in_accept , REJECT => "PVEFW-reject" },
2020 undef, $cluster_conf, $vmfw_conf);
2021 }
2022 };
2023 warn $@ if $@;
2024 }
2025 }
2026 }
2027
2028 sub generate_nfqueue {
2029 my ($options) = @_;
2030
2031 if ($options->{ips}) {
2032 my $action = "NFQUEUE";
2033 if ($options->{ips_queues} && $options->{ips_queues} =~ m/^(\d+)(:(\d+))?$/) {
2034 if (defined($3) && defined($1)) {
2035 $action .= " --queue-balance $1:$3";
2036 } elsif (defined($1)) {
2037 $action .= " --queue-num $1";
2038 }
2039 }
2040 $action .= " --queue-bypass" if $feature_ipset_nomatch; #need kernel 3.10
2041 return $action;
2042 } else {
2043 return "ACCEPT";
2044 }
2045 }
2046
2047 sub ruleset_generate_vm_ipsrules {
2048 my ($ruleset, $options, $direction, $iface) = @_;
2049
2050 if ($options->{ips} && $direction eq 'IN') {
2051 my $nfqueue = generate_nfqueue($options);
2052
2053 if (!ruleset_chain_exist($ruleset, "PVEFW-IPS")) {
2054 ruleset_create_chain($ruleset, "PVEFW-IPS");
2055 }
2056
2057 ruleset_addrule($ruleset, "PVEFW-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged -j $nfqueue");
2058 }
2059 }
2060
2061 sub generate_tap_rules_direction {
2062 my ($ruleset, $cluster_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $direction, $ipversion) = @_;
2063
2064 my $lc_direction = lc($direction);
2065
2066 my $rules = $vmfw_conf->{rules};
2067
2068 my $options = $vmfw_conf->{options};
2069 my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
2070
2071 my $tapchain = "$iface-$direction";
2072
2073 my $ipfilter_name = compute_ipfilter_ipset_name($netid);
2074 my $ipfilter_ipset = compute_ipset_chain_name($vmid, $ipfilter_name, $ipversion)
2075 if $vmfw_conf->{ipset}->{$ipfilter_name};
2076
2077 # create chain with mac and ip filter
2078 ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
2079
2080 if ($options->{enable}) {
2081 ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $tapchain, $netid, $direction, $options, $ipversion);
2082
2083 ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface);
2084
2085 # implement policy
2086 my $policy;
2087
2088 if ($direction eq 'OUT') {
2089 $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
2090 } else {
2091 $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
2092 }
2093
2094 my $accept = generate_nfqueue($options);
2095 my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
2096 ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, $policy, $loglevel, $accept_action);
2097 } else {
2098 my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : 'ACCEPT';
2099 ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, 'ACCEPT', $loglevel, $accept_action);
2100 }
2101
2102 # plug the tap chain to bridge chain
2103 if ($direction eq 'IN') {
2104 ruleset_addrule($ruleset, "PVEFW-FWBR-IN",
2105 "-m physdev --physdev-is-bridged --physdev-out $iface -j $tapchain");
2106 } else {
2107 ruleset_addrule($ruleset, "PVEFW-FWBR-OUT",
2108 "-m physdev --physdev-is-bridged --physdev-in $iface -j $tapchain");
2109 }
2110 }
2111
2112 sub enable_host_firewall {
2113 my ($ruleset, $hostfw_conf, $cluster_conf, $ipversion) = @_;
2114
2115 my $options = $hostfw_conf->{options};
2116 my $cluster_options = $cluster_conf->{options};
2117 my $rules = $hostfw_conf->{rules};
2118 my $cluster_rules = $cluster_conf->{rules};
2119
2120 # host inbound firewall
2121 my $chain = "PVEFW-HOST-IN";
2122 ruleset_create_chain($ruleset, $chain);
2123
2124 my $loglevel = get_option_log_level($options, "log_level_in");
2125
2126 ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
2127
2128 ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options);
2129 ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
2130 ruleset_chain_add_input_filters($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel);
2131
2132 # we use RETURN because we need to check also tap rules
2133 my $accept_action = 'RETURN';
2134
2135 ruleset_addrule($ruleset, $chain, "-p igmp -j $accept_action"); # important for multicast
2136
2137 # add host rules first, so that cluster wide rules can be overwritten
2138 foreach my $rule (@$rules, @$cluster_rules) {
2139 next if !$rule->{enable} || $rule->{errors};
2140 next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2141
2142 $rule->{iface_in} = $rule->{iface} if $rule->{iface};
2143
2144 eval {
2145 if ($rule->{type} eq 'group') {
2146 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'IN', $accept_action, $ipversion);
2147 } elsif ($rule->{type} eq 'in') {
2148 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
2149 { ACCEPT => $accept_action, REJECT => "PVEFW-reject" },
2150 undef, $cluster_conf, $hostfw_conf);
2151 }
2152 };
2153 warn $@ if $@;
2154 delete $rule->{iface_in};
2155 }
2156
2157 # allow standard traffic for management ipset (includes cluster network)
2158 my $mngmnt_ipset_chain = compute_ipset_chain_name(0, "management", $ipversion);
2159 my $mngmntsrc = "-m set --match-set ${mngmnt_ipset_chain} src";
2160 ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 8006 -j $accept_action"); # PVE API
2161 ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 5900:5999 -j $accept_action"); # PVE VNC Console
2162 ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 3128 -j $accept_action"); # SPICE Proxy
2163 ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 22 -j $accept_action"); # SSH
2164
2165 my $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
2166 my $localnet_ver = $cluster_conf->{aliases}->{local_network}->{ipversion};
2167
2168 # corosync
2169 if ($localnet && ($ipversion == $localnet_ver)) {
2170 my $corosync_rule = "-p udp --dport 5404:5405 -j $accept_action";
2171 ruleset_addrule($ruleset, $chain, "-s $localnet -d $localnet $corosync_rule");
2172 ruleset_addrule($ruleset, $chain, "-s $localnet -m addrtype --dst-type MULTICAST $corosync_rule");
2173 }
2174
2175 # implement input policy
2176 my $policy = $cluster_options->{policy_in} || 'DROP'; # allow nothing by default
2177 ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2178
2179 # host outbound firewall
2180 $chain = "PVEFW-HOST-OUT";
2181 ruleset_create_chain($ruleset, $chain);
2182
2183 $loglevel = get_option_log_level($options, "log_level_out");
2184
2185 ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
2186
2187 ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options);
2188 ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
2189
2190 # we use RETURN because we may want to check other thigs later
2191 $accept_action = 'RETURN';
2192
2193 ruleset_addrule($ruleset, $chain, "-p igmp -j $accept_action"); # important for multicast
2194
2195 # add host rules first, so that cluster wide rules can be overwritten
2196 foreach my $rule (@$rules, @$cluster_rules) {
2197 next if !$rule->{enable} || $rule->{errors};
2198 next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2199
2200 $rule->{iface_out} = $rule->{iface} if $rule->{iface};
2201 eval {
2202 if ($rule->{type} eq 'group') {
2203 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'OUT', $accept_action, $ipversion);
2204 } elsif ($rule->{type} eq 'out') {
2205 ruleset_generate_rule($ruleset, $chain, $ipversion,
2206 $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" },
2207 undef, $cluster_conf, $hostfw_conf);
2208 }
2209 };
2210 warn $@ if $@;
2211 delete $rule->{iface_out};
2212 }
2213
2214 # allow standard traffic on cluster network
2215 if ($localnet && ($ipversion == $localnet_ver)) {
2216 ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 8006 -j $accept_action"); # PVE API
2217 ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 22 -j $accept_action"); # SSH
2218 ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 5900:5999 -j $accept_action"); # PVE VNC Console
2219 ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 3128 -j $accept_action"); # SPICE Proxy
2220
2221 my $corosync_rule = "-p udp --dport 5404:5405 -j $accept_action";
2222 ruleset_addrule($ruleset, $chain, "-d $localnet $corosync_rule");
2223 ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule");
2224 }
2225
2226 # implement output policy
2227 $policy = $cluster_options->{policy_out} || 'ACCEPT'; # allow everything by default
2228 ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2229
2230 ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
2231 ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
2232 }
2233
2234 sub generate_group_rules {
2235 my ($ruleset, $cluster_conf, $group, $ipversion) = @_;
2236
2237 my $rules = $cluster_conf->{groups}->{$group};
2238
2239 if (!$rules) {
2240 warn "no such security group '$group'\n";
2241 $rules = []; # create empty chain
2242 }
2243
2244 my $chain = "GROUP-${group}-IN";
2245
2246 ruleset_create_chain($ruleset, $chain);
2247 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
2248
2249 foreach my $rule (@$rules) {
2250 next if $rule->{type} ne 'in';
2251 next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2252 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
2253 { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" },
2254 undef, $cluster_conf);
2255 }
2256
2257 $chain = "GROUP-${group}-OUT";
2258
2259 ruleset_create_chain($ruleset, $chain);
2260 ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
2261
2262 foreach my $rule (@$rules) {
2263 next if $rule->{type} ne 'out';
2264 next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2265 # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
2266 # check also other tap rules later
2267 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
2268 { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" },
2269 undef, $cluster_conf);
2270 }
2271 }
2272
2273 my $MAX_NETS = 32;
2274 my $valid_netdev_names = {};
2275 for (my $i = 0; $i < $MAX_NETS; $i++) {
2276 $valid_netdev_names->{"net$i"} = 1;
2277 }
2278
2279 sub parse_fw_rule {
2280 my ($prefix, $line, $cluster_conf, $fw_conf, $rule_env, $verbose) = @_;
2281
2282 my $orig_line = $line;
2283
2284 my $rule = {};
2285
2286 # we can add single line comments to the end of the rule
2287 if ($line =~ s/#\s*(.*?)\s*$//) {
2288 $rule->{comment} = decode('utf8', $1);
2289 }
2290
2291 # we can disable a rule when prefixed with '|'
2292
2293 $rule->{enable} = $line =~ s/^\|// ? 0 : 1;
2294
2295 $line =~ s/^(\S+)\s+(\S+)\s*// ||
2296 die "unable to parse rule: $line\n";
2297
2298 $rule->{type} = lc($1);
2299 $rule->{action} = $2;
2300
2301 if ($rule->{type} eq 'in' || $rule->{type} eq 'out') {
2302 if ($rule->{action} =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
2303 $rule->{macro} = $1;
2304 $rule->{action} = $2;
2305 }
2306 }
2307
2308 while (length($line)) {
2309 if ($line =~ s/^-i (\S+)\s*//) {
2310 $rule->{iface} = $1;
2311 next;
2312 }
2313
2314 last if $rule->{type} eq 'group';
2315
2316 if ($line =~ s/^-p (\S+)\s*//) {
2317 $rule->{proto} = $1;
2318 next;
2319 }
2320
2321 if ($line =~ s/^-dport (\S+)\s*//) {
2322 $rule->{dport} = $1;
2323 next;
2324 }
2325
2326 if ($line =~ s/^-sport (\S+)\s*//) {
2327 $rule->{sport} = $1;
2328 next;
2329 }
2330 if ($line =~ s/^-source (\S+)\s*//) {
2331 $rule->{source} = $1;
2332 next;
2333 }
2334 if ($line =~ s/^-dest (\S+)\s*//) {
2335 $rule->{dest} = $1;
2336 next;
2337 }
2338
2339 last;
2340 }
2341
2342 die "unable to parse rule parameters: $line\n" if length($line);
2343
2344 $rule = verify_rule($rule, $cluster_conf, $fw_conf, $rule_env, 1);
2345 if ($verbose && $rule->{errors}) {
2346 warn "$prefix - errors in rule parameters: $orig_line\n";
2347 foreach my $p (keys %{$rule->{errors}}) {
2348 warn " $p: $rule->{errors}->{$p}\n";
2349 }
2350 }
2351
2352 return $rule;
2353 }
2354
2355 sub parse_vmfw_option {
2356 my ($line) = @_;
2357
2358 my ($opt, $value);
2359
2360 my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2361
2362 if ($line =~ m/^(enable|dhcp|ndp|radv|macfilter|ips):\s*(0|1)\s*$/i) {
2363 $opt = lc($1);
2364 $value = int($2);
2365 } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
2366 $opt = lc($1);
2367 $value = $2 ? lc($3) : '';
2368 } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2369 $opt = lc($1);
2370 $value = uc($3);
2371 } elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
2372 $opt = lc($1);
2373 $value = $2;
2374 } else {
2375 die "can't parse option '$line'\n"
2376 }
2377
2378 return ($opt, $value);
2379 }
2380
2381 sub parse_hostfw_option {
2382 my ($line) = @_;
2383
2384 my ($opt, $value);
2385
2386 my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2387
2388 if ($line =~ m/^(enable|nosmurfs|tcpflags|ndp):\s*(0|1)\s*$/i) {
2389 $opt = lc($1);
2390 $value = int($2);
2391 } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
2392 $opt = lc($1);
2393 $value = $2 ? lc($3) : '';
2394 } elsif ($line =~ m/^(nf_conntrack_max|nf_conntrack_tcp_timeout_established):\s*(\d+)\s*$/i) {
2395 $opt = lc($1);
2396 $value = int($2);
2397 } else {
2398 die "can't parse option '$line'\n"
2399 }
2400
2401 return ($opt, $value);
2402 }
2403
2404 sub parse_clusterfw_option {
2405 my ($line) = @_;
2406
2407 my ($opt, $value);
2408
2409 if ($line =~ m/^(enable):\s*(\d+)\s*$/i) {
2410 $opt = lc($1);
2411 $value = int($2);
2412 if (($value > 1) && ((time() - $value) > 60)) {
2413 $value = 0
2414 }
2415 } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2416 $opt = lc($1);
2417 $value = uc($3);
2418 } else {
2419 die "can't parse option '$line'\n"
2420 }
2421
2422 return ($opt, $value);
2423 }
2424
2425 sub resolve_alias {
2426 my ($clusterfw_conf, $fw_conf, $cidr) = @_;
2427
2428 my $alias = lc($cidr);
2429 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2430 $e = $clusterfw_conf->{aliases}->{$alias} if !$e && $clusterfw_conf;
2431
2432 die "no such alias '$cidr'\n" if !$e;;
2433
2434 return wantarray ? ($e->{cidr}, $e->{ipversion}) : $e->{cidr};
2435 }
2436
2437 sub parse_ip_or_cidr {
2438 my ($cidr) = @_;
2439
2440 my $ipversion;
2441
2442 if ($cidr =~ m!^(?:$IPV6RE)(/(\d+))?$!) {
2443 $cidr =~ s|/128$||;
2444 $ipversion = 6;
2445 } elsif ($cidr =~ m!^(?:$IPV4RE)(/(\d+))?$!) {
2446 $cidr =~ s|/32$||;
2447 $ipversion = 4;
2448 } else {
2449 die "value does not look like a valid IP address or CIDR network\n";
2450 }
2451
2452 return wantarray ? ($cidr, $ipversion) : $cidr;
2453 }
2454
2455 sub parse_alias {
2456 my ($line) = @_;
2457
2458 # we can add single line comments to the end of the line
2459 my $comment = decode('utf8', $1) if $line =~ s/\s*#\s*(.*?)\s*$//;
2460
2461 if ($line =~ m/^(\S+)\s(\S+)$/) {
2462 my ($name, $cidr) = ($1, $2);
2463 my $ipversion;
2464
2465 ($cidr, $ipversion) = parse_ip_or_cidr($cidr);
2466
2467 my $data = {
2468 name => $name,
2469 cidr => $cidr,
2470 ipversion => $ipversion,
2471 };
2472 $data->{comment} = $comment if $comment;
2473 return $data;
2474 }
2475
2476 return undef;
2477 }
2478
2479 sub generic_fw_config_parser {
2480 my ($filename, $fh, $verbose, $cluster_conf, $empty_conf, $rule_env) = @_;
2481
2482 my $section;
2483 my $group;
2484
2485 my $res = $empty_conf;
2486
2487 while (defined(my $line = <$fh>)) {
2488 next if $line =~ m/^#/;
2489 next if $line =~ m/^\s*$/;
2490
2491 chomp $line;
2492
2493 my $linenr = $fh->input_line_number();
2494 my $prefix = "$filename (line $linenr)";
2495
2496 if ($empty_conf->{options} && ($line =~ m/^\[options\]$/i)) {
2497 $section = 'options';
2498 next;
2499 }
2500
2501 if ($empty_conf->{aliases} && ($line =~ m/^\[aliases\]$/i)) {
2502 $section = 'aliases';
2503 next;
2504 }
2505
2506 if ($empty_conf->{groups} && ($line =~ m/^\[group\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2507 $section = 'groups';
2508 $group = lc($1);
2509 my $comment = $2;
2510 eval {
2511 die "security group name too long\n" if length($group) > $max_group_name_length;
2512 die "invalid security group name '$group'\n" if $group !~ m/^${security_group_name_pattern}$/;
2513 };
2514 if (my $err = $@) {
2515 ($section, $group, $comment) = undef;
2516 warn "$prefix: $err";
2517 next;
2518 }
2519
2520 $res->{$section}->{$group} = [];
2521 $res->{group_comments}->{$group} = decode('utf8', $comment)
2522 if $comment;
2523 next;
2524 }
2525
2526 if ($empty_conf->{rules} && ($line =~ m/^\[rules\]$/i)) {
2527 $section = 'rules';
2528 next;
2529 }
2530
2531 if ($empty_conf->{ipset} && ($line =~ m/^\[ipset\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2532 $section = 'ipset';
2533 $group = lc($1);
2534 my $comment = $2;
2535 eval {
2536 die "ipset name too long\n" if length($group) > $max_ipset_name_length;
2537 die "invalid ipset name '$group'\n" if $group !~ m/^${ipset_name_pattern}$/;
2538 };
2539 if (my $err = $@) {
2540 ($section, $group, $comment) = undef;
2541 warn "$prefix: $err";
2542 next;
2543 }
2544
2545 $res->{$section}->{$group} = [];
2546 $res->{ipset_comments}->{$group} = decode('utf8', $comment)
2547 if $comment;
2548 next;
2549 }
2550
2551 if (!$section) {
2552 warn "$prefix: skip line - no section\n";
2553 next;
2554 }
2555
2556 if ($section eq 'options') {
2557 eval {
2558 my ($opt, $value);
2559 if ($rule_env eq 'cluster') {
2560 ($opt, $value) = parse_clusterfw_option($line);
2561 } elsif ($rule_env eq 'host') {
2562 ($opt, $value) = parse_hostfw_option($line);
2563 } else {
2564 ($opt, $value) = parse_vmfw_option($line);
2565 }
2566 $res->{options}->{$opt} = $value;
2567 };
2568 warn "$prefix: $@" if $@;
2569 } elsif ($section eq 'aliases') {
2570 eval {
2571 my $data = parse_alias($line);
2572 $res->{aliases}->{lc($data->{name})} = $data;
2573 };
2574 warn "$prefix: $@" if $@;
2575 } elsif ($section eq 'rules') {
2576 my $rule;
2577 eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, $res, $rule_env, $verbose); };
2578 if (my $err = $@) {
2579 warn "$prefix: $err";
2580 next;
2581 }
2582 push @{$res->{$section}}, $rule;
2583 } elsif ($section eq 'groups') {
2584 my $rule;
2585 eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, undef, 'group', $verbose); };
2586 if (my $err = $@) {
2587 warn "$prefix: $err";
2588 next;
2589 }
2590 push @{$res->{$section}->{$group}}, $rule;
2591 } elsif ($section eq 'ipset') {
2592 # we can add single line comments to the end of the rule
2593 my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
2594
2595 $line =~ m/^(\!)?\s*(\S+)\s*$/;
2596 my $nomatch = $1;
2597 my $cidr = $2;
2598 my $errors;
2599
2600 if ($nomatch && !$feature_ipset_nomatch) {
2601 $errors->{nomatch} = "nomatch not supported by kernel";
2602 }
2603
2604 eval {
2605 if ($cidr =~ m/^${ip_alias_pattern}$/) {
2606 resolve_alias($cluster_conf, $res, $cidr); # make sure alias exists
2607 } else {
2608 $cidr = parse_ip_or_cidr($cidr);
2609 }
2610 };
2611 if (my $err = $@) {
2612 chomp $err;
2613 $errors->{cidr} = $err;
2614 }
2615
2616 my $entry = { cidr => $cidr };
2617 $entry->{nomatch} = 1 if $nomatch;
2618 $entry->{comment} = $comment if $comment;
2619 $entry->{errors} = $errors if $errors;
2620
2621 if ($verbose && $errors) {
2622 warn "$prefix - errors in ipset '$group': $line\n";
2623 foreach my $p (keys %{$errors}) {
2624 warn " $p: $errors->{$p}\n";
2625 }
2626 }
2627
2628 push @{$res->{$section}->{$group}}, $entry;
2629 } else {
2630 warn "$prefix: skip line - unknown section\n";
2631 next;
2632 }
2633 }
2634
2635 return $res;
2636 }
2637
2638 sub parse_hostfw_config {
2639 my ($filename, $fh, $cluster_conf, $verbose) = @_;
2640
2641 my $empty_conf = { rules => [], options => {}};
2642
2643 return generic_fw_config_parser($filename, $fh, $verbose, $cluster_conf, $empty_conf, 'host');
2644 }
2645
2646 sub parse_vmfw_config {
2647 my ($filename, $fh, $cluster_conf, $rule_env, $verbose) = @_;
2648
2649 my $empty_conf = {
2650 rules => [],
2651 options => {},
2652 aliases => {},
2653 ipset => {} ,
2654 ipset_comments => {},
2655 };
2656
2657 return generic_fw_config_parser($filename, $fh, $verbose, $cluster_conf, $empty_conf, $rule_env);
2658 }
2659
2660 sub parse_clusterfw_config {
2661 my ($filename, $fh, $verbose) = @_;
2662
2663 my $section;
2664 my $group;
2665
2666 my $empty_conf = {
2667 rules => [],
2668 options => {},
2669 aliases => {},
2670 groups => {},
2671 group_comments => {},
2672 ipset => {} ,
2673 ipset_comments => {},
2674 };
2675
2676 return generic_fw_config_parser($filename, $fh, $verbose, $empty_conf, $empty_conf, 'cluster');
2677 }
2678
2679 sub run_locked {
2680 my ($code, @param) = @_;
2681
2682 my $timeout = 10;
2683
2684 my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
2685
2686 die $@ if $@;
2687
2688 return $res;
2689 }
2690
2691 sub read_local_vm_config {
2692
2693 my $qemu = {};
2694 my $lxc = {};
2695
2696 my $vmdata = { qemu => $qemu, lxc => $lxc };
2697
2698 my $vmlist = PVE::Cluster::get_vmlist();
2699 return $vmdata if !$vmlist || !$vmlist->{ids};
2700 my $ids = $vmlist->{ids};
2701
2702 foreach my $vmid (keys %$ids) {
2703 next if !$vmid; # skip VE0
2704 my $d = $ids->{$vmid};
2705 next if !$d->{node} || $d->{node} ne $nodename;
2706 next if !$d->{type};
2707 if ($d->{type} eq 'qemu') {
2708 if ($have_qemu_server) {
2709 my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
2710 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2711 $qemu->{$vmid} = $conf;
2712 }
2713 }
2714 } elsif ($d->{type} eq 'lxc') {
2715 if ($have_lxc) {
2716 my $cfspath = PVE::LXC::cfs_config_path($vmid);
2717 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2718 $lxc->{$vmid} = $conf;
2719 }
2720 }
2721 }
2722 }
2723
2724 return $vmdata;
2725 };
2726
2727 sub load_vmfw_conf {
2728 my ($cluster_conf, $rule_env, $vmid, $dir, $verbose) = @_;
2729
2730 my $vmfw_conf = {};
2731
2732 $dir = $pvefw_conf_dir if !defined($dir);
2733
2734 my $filename = "$dir/$vmid.fw";
2735 if (my $fh = IO::File->new($filename, O_RDONLY)) {
2736 $vmfw_conf = parse_vmfw_config($filename, $fh, $cluster_conf, $rule_env, $verbose);
2737 $vmfw_conf->{vmid} = $vmid;
2738 }
2739
2740 return $vmfw_conf;
2741 }
2742
2743 my $format_rules = sub {
2744 my ($rules, $allow_iface) = @_;
2745
2746 my $raw = '';
2747
2748 foreach my $rule (@$rules) {
2749 if ($rule->{type} eq 'in' || $rule->{type} eq 'out' || $rule->{type} eq 'group') {
2750 $raw .= '|' if defined($rule->{enable}) && !$rule->{enable};
2751 $raw .= uc($rule->{type});
2752 if ($rule->{macro}) {
2753 $raw .= " $rule->{macro}($rule->{action})";
2754 } else {
2755 $raw .= " " . $rule->{action};
2756 }
2757 if ($allow_iface && $rule->{iface}) {
2758 $raw .= " -i $rule->{iface}";
2759 }
2760
2761 if ($rule->{type} ne 'group') {
2762 $raw .= " -source $rule->{source}" if $rule->{source};
2763 $raw .= " -dest $rule->{dest}" if $rule->{dest};
2764 $raw .= " -p $rule->{proto}" if $rule->{proto};
2765 $raw .= " -dport $rule->{dport}" if $rule->{dport};
2766 $raw .= " -sport $rule->{sport}" if $rule->{sport};
2767 }
2768
2769 $raw .= " # " . encode('utf8', $rule->{comment})
2770 if $rule->{comment} && $rule->{comment} !~ m/^\s*$/;
2771 $raw .= "\n";
2772 } else {
2773 die "unknown rule type '$rule->{type}'";
2774 }
2775 }
2776
2777 return $raw;
2778 };
2779
2780 my $format_options = sub {
2781 my ($options) = @_;
2782
2783 my $raw = '';
2784
2785 $raw .= "[OPTIONS]\n\n";
2786 foreach my $opt (keys %$options) {
2787 $raw .= "$opt: $options->{$opt}\n";
2788 }
2789 $raw .= "\n";
2790
2791 return $raw;
2792 };
2793
2794 my $format_aliases = sub {
2795 my ($aliases) = @_;
2796
2797 my $raw = '';
2798
2799 $raw .= "[ALIASES]\n\n";
2800 foreach my $k (keys %$aliases) {
2801 my $e = $aliases->{$k};
2802 $raw .= "$e->{name} $e->{cidr}";
2803 $raw .= " # " . encode('utf8', $e->{comment})
2804 if $e->{comment} && $e->{comment} !~ m/^\s*$/;
2805 $raw .= "\n";
2806 }
2807 $raw .= "\n";
2808
2809 return $raw;
2810 };
2811
2812 my $format_ipsets = sub {
2813 my ($fw_conf) = @_;
2814
2815 my $raw = '';
2816
2817 foreach my $ipset (sort keys %{$fw_conf->{ipset}}) {
2818 if (my $comment = $fw_conf->{ipset_comments}->{$ipset}) {
2819 my $utf8comment = encode('utf8', $comment);
2820 $raw .= "[IPSET $ipset] # $utf8comment\n\n";
2821 } else {
2822 $raw .= "[IPSET $ipset]\n\n";
2823 }
2824 my $options = $fw_conf->{ipset}->{$ipset};
2825
2826 my $nethash = {};
2827 foreach my $entry (@$options) {
2828 $nethash->{$entry->{cidr}} = $entry;
2829 }
2830
2831 foreach my $cidr (sort keys %$nethash) {
2832 my $entry = $nethash->{$cidr};
2833 my $line = $entry->{nomatch} ? '!' : '';
2834 $line .= $entry->{cidr};
2835 $line .= " # " . encode('utf8', $entry->{comment})
2836 if $entry->{comment} && $entry->{comment} !~ m/^\s*$/;
2837 $raw .= "$line\n";
2838 }
2839
2840 $raw .= "\n";
2841 }
2842
2843 return $raw;
2844 };
2845
2846 sub save_vmfw_conf {
2847 my ($vmid, $vmfw_conf) = @_;
2848
2849 my $raw = '';
2850
2851 my $options = $vmfw_conf->{options};
2852 $raw .= &$format_options($options) if $options && scalar(keys %$options);
2853
2854 my $aliases = $vmfw_conf->{aliases};
2855 $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
2856
2857 $raw .= &$format_ipsets($vmfw_conf) if $vmfw_conf->{ipset};
2858
2859 my $rules = $vmfw_conf->{rules} || [];
2860 if ($rules && scalar(@$rules)) {
2861 $raw .= "[RULES]\n\n";
2862 $raw .= &$format_rules($rules, 1);
2863 $raw .= "\n";
2864 }
2865
2866 my $filename = "$pvefw_conf_dir/$vmid.fw";
2867 if ($raw) {
2868 mkdir $pvefw_conf_dir;
2869 PVE::Tools::file_set_contents($filename, $raw);
2870 } else {
2871 unlink $filename;
2872 }
2873 }
2874
2875 sub remove_vmfw_conf {
2876 my ($vmid) = @_;
2877
2878 my $vmfw_conffile = "$pvefw_conf_dir/$vmid.fw";
2879
2880 unlink $vmfw_conffile;
2881 }
2882
2883 sub clone_vmfw_conf {
2884 my ($vmid, $newid) = @_;
2885
2886 my $sourcevm_conffile = "$pvefw_conf_dir/$vmid.fw";
2887 my $clonevm_conffile = "$pvefw_conf_dir/$newid.fw";
2888
2889 if (-f $clonevm_conffile) {
2890 unlink $clonevm_conffile;
2891 }
2892 if (-f $sourcevm_conffile) {
2893 my $data = PVE::Tools::file_get_contents($sourcevm_conffile);
2894 PVE::Tools::file_set_contents($clonevm_conffile, $data);
2895 }
2896 }
2897
2898 sub read_vm_firewall_configs {
2899 my ($cluster_conf, $vmdata, $dir, $verbose) = @_;
2900
2901 my $vmfw_configs = {};
2902
2903 foreach my $vmid (keys %{$vmdata->{qemu}}) {
2904 my $vmfw_conf = load_vmfw_conf($cluster_conf, 'vm', $vmid, $dir, $verbose);
2905 next if !$vmfw_conf->{options}; # skip if file does not exists
2906 $vmfw_configs->{$vmid} = $vmfw_conf;
2907 }
2908 foreach my $vmid (keys %{$vmdata->{lxc}}) {
2909 my $vmfw_conf = load_vmfw_conf($cluster_conf, 'ct', $vmid, $dir, $verbose);
2910 next if !$vmfw_conf->{options}; # skip if file does not exists
2911 $vmfw_configs->{$vmid} = $vmfw_conf;
2912 }
2913
2914 return $vmfw_configs;
2915 }
2916
2917 sub get_option_log_level {
2918 my ($options, $k) = @_;
2919
2920 my $v = $options->{$k};
2921 $v = $default_log_level if !defined($v);
2922
2923 return undef if $v eq '' || $v eq 'nolog';
2924
2925 $v = $log_level_hash->{$v} if defined($log_level_hash->{$v});
2926
2927 return $v if ($v >= 0) && ($v <= 7);
2928
2929 warn "unknown log level ($k = '$v')\n";
2930
2931 return undef;
2932 }
2933
2934 sub generate_std_chains {
2935 my ($ruleset, $options, $ipversion) = @_;
2936
2937 my $std_chains = $pve_std_chains->{$ipversion} || die "internal error";
2938
2939 my $loglevel = get_option_log_level($options, 'smurf_log_level');
2940
2941 my $chain;
2942
2943 if ($ipversion == 4) {
2944 # same as shorewall smurflog.
2945 $chain = 'PVEFW-smurflog';
2946 $std_chains->{$chain} = [];
2947
2948 push @{$std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
2949 push @{$std_chains->{$chain}}, "-j DROP";
2950 }
2951
2952 # same as shorewall logflags action.
2953 $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
2954 $chain = 'PVEFW-logflags';
2955 $std_chains->{$chain} = [];
2956
2957 # fixme: is this correctly logged by pvewf-logger? (ther is no --log-ip-options for NFLOG)
2958 push @{$std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
2959 push @{$std_chains->{$chain}}, "-j DROP";
2960
2961 foreach my $chain (keys %$std_chains) {
2962 ruleset_create_chain($ruleset, $chain);
2963 foreach my $rule (@{$std_chains->{$chain}}) {
2964 if (ref($rule)) {
2965 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule);
2966 } else {
2967 ruleset_addrule($ruleset, $chain, $rule);
2968 }
2969 }
2970 }
2971 }
2972
2973 sub generate_ipset_chains {
2974 my ($ipset_ruleset, $clusterfw_conf, $fw_conf) = @_; #fixme
2975
2976 foreach my $ipset (keys %{$fw_conf->{ipset}}) {
2977
2978 my $options = $fw_conf->{ipset}->{$ipset};
2979
2980 # remove duplicates
2981 my $nethash = {};
2982 foreach my $entry (@$options) {
2983 next if $entry->{errors}; # skip entries with errors
2984 eval {
2985 my ($cidr, $ver);
2986 if ($entry->{cidr} =~ m/^${ip_alias_pattern}$/) {
2987 ($cidr, $ver) = resolve_alias($clusterfw_conf, $fw_conf, $entry->{cidr});
2988 } else {
2989 ($cidr, $ver) = parse_ip_or_cidr($entry->{cidr});
2990 }
2991 #http://backreference.org/2013/03/01/ipv6-address-normalization/
2992 if ($ver == 6) {
2993 $cidr = lc(Net::IP::ip_compress_address($cidr, 6));
2994 $cidr =~ s|/128$||;
2995 } else {
2996 $cidr =~ s|/32$||;
2997 }
2998
2999 $nethash->{$ver}->{$cidr} = { cidr => $cidr, nomatch => $entry->{nomatch} };
3000 };
3001 warn $@ if $@;
3002 }
3003
3004 foreach my $ipversion (4, 6) {
3005 my $data = $nethash->{$ipversion};
3006
3007 my $name = compute_ipset_chain_name($fw_conf->{vmid}, $ipset, $ipversion);
3008
3009 my $hashsize = scalar(@$options);
3010 if ($hashsize <= 64) {
3011 $hashsize = 64;
3012 } else {
3013 $hashsize = round_powerof2($hashsize);
3014 }
3015
3016 my $family = $ipversion == "6" ? "inet6" : "inet";
3017
3018 $ipset_ruleset->{$name} = ["create $name hash:net family $family hashsize $hashsize maxelem $hashsize"];
3019
3020 foreach my $cidr (sort keys %$data) {
3021 my $entry = $data->{$cidr};
3022
3023 my $cmd = "add $name $cidr";
3024 if ($entry->{nomatch}) {
3025 if ($feature_ipset_nomatch) {
3026 push @{$ipset_ruleset->{$name}}, "$cmd nomatch";
3027 } else {
3028 warn "ignore !$cidr - nomatch not supported by kernel\n";
3029 }
3030 } else {
3031 push @{$ipset_ruleset->{$name}}, $cmd;
3032 }
3033 }
3034 }
3035 }
3036 }
3037
3038 sub round_powerof2 {
3039 my ($int) = @_;
3040
3041 $int--;
3042 $int |= $int >> $_ foreach (1,2,4,8,16);
3043 return ++$int;
3044 }
3045
3046 sub load_clusterfw_conf {
3047 my ($filename, $verbose) = @_;
3048
3049 $filename = $clusterfw_conf_filename if !defined($filename);
3050
3051 my $cluster_conf = {};
3052 if (my $fh = IO::File->new($filename, O_RDONLY)) {
3053 $cluster_conf = parse_clusterfw_config($filename, $fh, $verbose);
3054 }
3055
3056 return $cluster_conf;
3057 }
3058
3059 sub save_clusterfw_conf {
3060 my ($cluster_conf) = @_;
3061
3062 my $raw = '';
3063
3064 my $options = $cluster_conf->{options};
3065 $raw .= &$format_options($options) if $options && scalar(keys %$options);
3066
3067 my $aliases = $cluster_conf->{aliases};
3068 $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3069
3070 $raw .= &$format_ipsets($cluster_conf) if $cluster_conf->{ipset};
3071
3072 my $rules = $cluster_conf->{rules};
3073 if ($rules && scalar(@$rules)) {
3074 $raw .= "[RULES]\n\n";
3075 $raw .= &$format_rules($rules, 1);
3076 $raw .= "\n";
3077 }
3078
3079 if ($cluster_conf->{groups}) {
3080 foreach my $group (sort keys %{$cluster_conf->{groups}}) {
3081 my $rules = $cluster_conf->{groups}->{$group};
3082 if (my $comment = $cluster_conf->{group_comments}->{$group}) {
3083 my $utf8comment = encode('utf8', $comment);
3084 $raw .= "[group $group] # $utf8comment\n\n";
3085 } else {
3086 $raw .= "[group $group]\n\n";
3087 }
3088
3089 $raw .= &$format_rules($rules, 0);
3090 $raw .= "\n";
3091 }
3092 }
3093
3094 if ($raw) {
3095 mkdir $pvefw_conf_dir;
3096 PVE::Tools::file_set_contents($clusterfw_conf_filename, $raw);
3097 } else {
3098 unlink $clusterfw_conf_filename;
3099 }
3100 }
3101
3102 sub load_hostfw_conf {
3103 my ($cluster_conf, $filename, $verbose) = @_;
3104
3105 $filename = $hostfw_conf_filename if !defined($filename);
3106
3107 my $hostfw_conf = {};
3108 if (my $fh = IO::File->new($filename, O_RDONLY)) {
3109 $hostfw_conf = parse_hostfw_config($filename, $fh, $cluster_conf, $verbose);
3110 }
3111 return $hostfw_conf;
3112 }
3113
3114 sub save_hostfw_conf {
3115 my ($hostfw_conf) = @_;
3116
3117 my $raw = '';
3118
3119 my $options = $hostfw_conf->{options};
3120 $raw .= &$format_options($options) if $options && scalar(keys %$options);
3121
3122 my $rules = $hostfw_conf->{rules};
3123 if ($rules && scalar(@$rules)) {
3124 $raw .= "[RULES]\n\n";
3125 $raw .= &$format_rules($rules, 1);
3126 $raw .= "\n";
3127 }
3128
3129 if ($raw) {
3130 PVE::Tools::file_set_contents($hostfw_conf_filename, $raw);
3131 } else {
3132 unlink $hostfw_conf_filename;
3133 }
3134 }
3135
3136 sub compile {
3137 my ($cluster_conf, $hostfw_conf, $vmdata, $verbose) = @_;
3138
3139 my $vmfw_configs;
3140
3141 if ($vmdata) { # test mode
3142 my $testdir = $vmdata->{testdir} || die "no test directory specified";
3143 my $filename = "$testdir/cluster.fw";
3144 $cluster_conf = load_clusterfw_conf($filename, $verbose);
3145
3146 $filename = "$testdir/host.fw";
3147 $hostfw_conf = load_hostfw_conf($cluster_conf, $filename, $verbose);
3148
3149 $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, $testdir, $verbose);
3150 } else { # normal operation
3151 $cluster_conf = load_clusterfw_conf(undef, $verbose) if !$cluster_conf;
3152
3153 $hostfw_conf = load_hostfw_conf($cluster_conf, undef, $verbose) if !$hostfw_conf;
3154
3155 $vmdata = read_local_vm_config();
3156 $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, undef, $verbose);
3157 }
3158
3159 my ($ruleset, $ipset_ruleset) = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 4, $verbose);
3160 my ($rulesetv6) = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 6, $verbose);
3161
3162 return ($ruleset, $ipset_ruleset, $rulesetv6);
3163 }
3164
3165 sub compile_iptables_filter {
3166 my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $ipversion, $verbose) = @_;
3167
3168 my $localnet;
3169 if ($cluster_conf->{aliases}->{local_network}) {
3170 $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3171 } else {
3172 my $localnet_ver;
3173 ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3174
3175 $cluster_conf->{aliases}->{local_network} = {
3176 name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3177 }
3178
3179 push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3180
3181 return ({}, {}) if !$cluster_conf->{options}->{enable};
3182
3183 my $ruleset = {};
3184
3185 ruleset_create_chain($ruleset, "PVEFW-INPUT");
3186 ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
3187
3188 ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3189
3190 my $hostfw_options = $hostfw_conf->{options} || {};
3191
3192 # fixme: what log level should we use here?
3193 my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
3194
3195 ruleset_chain_add_conn_filters($ruleset, "PVEFW-FORWARD", "ACCEPT");
3196
3197 ruleset_create_chain($ruleset, "PVEFW-FWBR-IN");
3198 ruleset_chain_add_input_filters($ruleset, "PVEFW-FWBR-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
3199
3200 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-in fwln+ -j PVEFW-FWBR-IN");
3201
3202 ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3203 ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-out fwln+ -j PVEFW-FWBR-OUT");
3204
3205 generate_std_chains($ruleset, $hostfw_options, $ipversion);
3206
3207 my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
3208
3209 my $ipset_ruleset = {};
3210
3211 if ($hostfw_enable) {
3212 eval { enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf, $ipversion); };
3213 warn $@ if $@; # just to be sure - should not happen
3214 }
3215
3216 # generate firewall rules for QEMU VMs
3217 foreach my $vmid (keys %{$vmdata->{qemu}}) {
3218 eval {
3219 my $conf = $vmdata->{qemu}->{$vmid};
3220 my $vmfw_conf = $vmfw_configs->{$vmid};
3221 return if !$vmfw_conf;
3222
3223 generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf);
3224
3225 foreach my $netid (keys %$conf) {
3226 next if $netid !~ m/^net(\d+)$/;
3227 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3228 next if !$net->{firewall};
3229 my $iface = "tap${vmid}i$1";
3230
3231 my $macaddr = $net->{macaddr};
3232 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3233 $vmfw_conf, $vmid, 'IN', $ipversion);
3234 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3235 $vmfw_conf, $vmid, 'OUT', $ipversion);
3236 }
3237 };
3238 warn $@ if $@; # just to be sure - should not happen
3239 }
3240
3241 # generate firewall rules for LXC containers
3242 foreach my $vmid (keys %{$vmdata->{lxc}}) {
3243 eval {
3244 my $conf = $vmdata->{lxc}->{$vmid};
3245 my $vmfw_conf = $vmfw_configs->{$vmid};
3246 return if !$vmfw_conf;
3247
3248 generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf);
3249
3250 if ($vmfw_conf->{options}->{enable}) {
3251 foreach my $netid (keys %$conf) {
3252 next if $netid !~ m/^net(\d+)$/;
3253 my $net = PVE::LXC::parse_lxc_network($conf->{$netid});
3254 next if !$net->{firewall};
3255 my $iface = "veth${vmid}i$1";
3256 my $macaddr = $net->{hwaddr};
3257 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3258 $vmfw_conf, $vmid, 'IN', $ipversion);
3259 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3260 $vmfw_conf, $vmid, 'OUT', $ipversion);
3261 }
3262 }
3263 };
3264 warn $@ if $@; # just to be sure - should not happen
3265 }
3266
3267 if(ruleset_chain_exist($ruleset, "PVEFW-IPS")){
3268 ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j PVEFW-IPS");
3269 }
3270
3271 generate_ipset_chains($ipset_ruleset, undef, $cluster_conf);
3272
3273 return ($ruleset, $ipset_ruleset);
3274 }
3275
3276 sub get_ruleset_status {
3277 my ($ruleset, $active_chains, $digest_fn, $verbose) = @_;
3278
3279 my $statushash = {};
3280
3281 foreach my $chain (sort keys %$ruleset) {
3282 my $sig = &$digest_fn($ruleset->{$chain});
3283
3284 $statushash->{$chain}->{sig} = $sig;
3285
3286 my $oldsig = $active_chains->{$chain};
3287 if (!defined($oldsig)) {
3288 $statushash->{$chain}->{action} = 'create';
3289 } else {
3290 if ($oldsig eq $sig) {
3291 $statushash->{$chain}->{action} = 'exists';
3292 } else {
3293 $statushash->{$chain}->{action} = 'update';
3294 }
3295 }
3296 print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
3297 foreach my $cmd (@{$ruleset->{$chain}}) {
3298 print "\t$cmd\n" if $verbose;
3299 }
3300 }
3301
3302 foreach my $chain (sort keys %$active_chains) {
3303 if (!defined($ruleset->{$chain})) {
3304 my $sig = $active_chains->{$chain};
3305 $statushash->{$chain}->{action} = 'delete';
3306 $statushash->{$chain}->{sig} = $sig;
3307 print "delete $chain ($sig)\n" if $verbose;
3308 }
3309 }
3310
3311 return $statushash;
3312 }
3313
3314 sub print_sig_rule {
3315 my ($chain, $sig) = @_;
3316
3317 # We just use this to store a SHA1 checksum used to detect changes
3318 return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
3319 }
3320
3321 sub get_ruleset_cmdlist {
3322 my ($ruleset, $verbose, $iptablescmd) = @_;
3323
3324 my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
3325
3326 my ($active_chains, $hooks) = iptables_get_chains($iptablescmd);
3327 my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, $verbose);
3328
3329 # create missing chains first
3330 foreach my $chain (sort keys %$ruleset) {
3331 my $stat = $statushash->{$chain};
3332 die "internal error" if !$stat;
3333 next if $stat->{action} ne 'create';
3334
3335 $cmdlist .= ":$chain - [0:0]\n";
3336 }
3337
3338 foreach my $h (qw(INPUT OUTPUT FORWARD)) {
3339 my $chain = "PVEFW-$h";
3340 if ($ruleset->{$chain} && !$hooks->{$h}) {
3341 $cmdlist .= "-A $h -j $chain\n";
3342 }
3343 }
3344
3345 foreach my $chain (sort keys %$ruleset) {
3346 my $stat = $statushash->{$chain};
3347 die "internal error" if !$stat;
3348
3349 if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
3350 $cmdlist .= "-F $chain\n";
3351 foreach my $cmd (@{$ruleset->{$chain}}) {
3352 $cmdlist .= "$cmd\n";
3353 }
3354 $cmdlist .= print_sig_rule($chain, $stat->{sig});
3355 } elsif ($stat->{action} eq 'delete') {
3356 die "internal error"; # this should not happen
3357 } elsif ($stat->{action} eq 'exists') {
3358 # do nothing
3359 } else {
3360 die "internal error - unknown status '$stat->{action}'";
3361 }
3362 }
3363
3364 foreach my $chain (keys %$statushash) {
3365 next if $statushash->{$chain}->{action} ne 'delete';
3366 $cmdlist .= "-F $chain\n";
3367 }
3368 foreach my $chain (keys %$statushash) {
3369 next if $statushash->{$chain}->{action} ne 'delete';
3370 next if $chain eq 'PVEFW-INPUT';
3371 next if $chain eq 'PVEFW-OUTPUT';
3372 next if $chain eq 'PVEFW-FORWARD';
3373 $cmdlist .= "-X $chain\n";
3374 }
3375
3376 my $changes = $cmdlist ne "*filter\n" ? 1 : 0;
3377
3378 $cmdlist .= "COMMIT\n";
3379
3380 return wantarray ? ($cmdlist, $changes) : $cmdlist;
3381 }
3382
3383 sub get_ipset_cmdlist {
3384 my ($ruleset, $verbose) = @_;
3385
3386 my $cmdlist = "";
3387
3388 my $delete_cmdlist = "";
3389
3390 my $active_chains = ipset_get_chains();
3391 my $statushash = get_ruleset_status($ruleset, $active_chains, \&ipset_chain_digest, $verbose);
3392
3393 # remove stale _swap chains
3394 foreach my $chain (keys %$active_chains) {
3395 if ($chain =~ m/^PVEFW-\S+_swap$/) {
3396 $cmdlist .= "destroy $chain\n";
3397 }
3398 }
3399
3400 foreach my $chain (keys %$ruleset) {
3401 my $stat = $statushash->{$chain};
3402 die "internal error" if !$stat;
3403
3404 if ($stat->{action} eq 'create') {
3405 foreach my $cmd (@{$ruleset->{$chain}}) {
3406 $cmdlist .= "$cmd\n";
3407 }
3408 }
3409 }
3410
3411 foreach my $chain (keys %$ruleset) {
3412 my $stat = $statushash->{$chain};
3413 die "internal error" if !$stat;
3414
3415 if ($stat->{action} eq 'update') {
3416 my $chain_swap = $chain."_swap";
3417
3418 foreach my $cmd (@{$ruleset->{$chain}}) {
3419 $cmd =~ s/$chain/$chain_swap/;
3420 $cmdlist .= "$cmd\n";
3421 }
3422 $cmdlist .= "swap $chain_swap $chain\n";
3423 $cmdlist .= "flush $chain_swap\n";
3424 $cmdlist .= "destroy $chain_swap\n";
3425 }
3426 }
3427
3428 # the remove unused chains
3429 foreach my $chain (keys %$statushash) {
3430 next if $statushash->{$chain}->{action} ne 'delete';
3431
3432 $delete_cmdlist .= "flush $chain\n";
3433 $delete_cmdlist .= "destroy $chain\n";
3434 }
3435
3436 my $changes = ($cmdlist || $delete_cmdlist) ? 1 : 0;
3437
3438 return ($cmdlist, $delete_cmdlist, $changes);
3439 }
3440
3441 sub apply_ruleset {
3442 my ($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $verbose) = @_;
3443
3444 enable_bridge_firewall();
3445
3446 my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
3447 get_ipset_cmdlist($ipset_ruleset, undef, $verbose);
3448
3449 my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset, $verbose);
3450 my ($cmdlistv6, $changesv6) = get_ruleset_cmdlist($rulesetv6, $verbose, "ip6tables");
3451
3452 if ($verbose) {
3453 if ($ipset_changes) {
3454 print "ipset changes:\n";
3455 print $ipset_create_cmdlist if $ipset_create_cmdlist;
3456 print $ipset_delete_cmdlist if $ipset_delete_cmdlist;
3457 }
3458
3459 if ($changes) {
3460 print "iptables changes:\n";
3461 print $cmdlist;
3462 }
3463
3464 if ($changesv6) {
3465 print "ip6tables changes:\n";
3466 print $cmdlistv6;
3467 }
3468 }
3469
3470 my $tmpfile = "$pve_fw_status_dir/ipsetcmdlist1";
3471 PVE::Tools::file_set_contents($tmpfile, $ipset_create_cmdlist || '');
3472
3473 ipset_restore_cmdlist($ipset_create_cmdlist);
3474
3475 $tmpfile = "$pve_fw_status_dir/ip4cmdlist";
3476 PVE::Tools::file_set_contents($tmpfile, $cmdlist || '');
3477
3478 iptables_restore_cmdlist($cmdlist);
3479
3480 $tmpfile = "$pve_fw_status_dir/ip6cmdlist";
3481 PVE::Tools::file_set_contents($tmpfile, $cmdlistv6 || '');
3482
3483 ip6tables_restore_cmdlist($cmdlistv6);
3484
3485 $tmpfile = "$pve_fw_status_dir/ipsetcmdlist2";
3486 PVE::Tools::file_set_contents($tmpfile, $ipset_delete_cmdlist || '');
3487
3488 ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
3489
3490 # test: re-read status and check if everything is up to date
3491 my $active_chains = iptables_get_chains();
3492 my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, 0);
3493
3494 my $errors;
3495 foreach my $chain (sort keys %$ruleset) {
3496 my $stat = $statushash->{$chain};
3497 if ($stat->{action} ne 'exists') {
3498 warn "unable to update chain '$chain'\n";
3499 $errors = 1;
3500 }
3501 }
3502
3503 my $active_chainsv6 = iptables_get_chains("ip6tables");
3504 my $statushashv6 = get_ruleset_status($rulesetv6, $active_chainsv6, \&iptables_chain_digest, 0);
3505
3506 foreach my $chain (sort keys %$rulesetv6) {
3507 my $stat = $statushashv6->{$chain};
3508 if ($stat->{action} ne 'exists') {
3509 warn "unable to update chain '$chain'\n";
3510 $errors = 1;
3511 }
3512 }
3513
3514 die "unable to apply firewall changes\n" if $errors;
3515
3516 update_nf_conntrack_max($hostfw_conf);
3517
3518 update_nf_conntrack_tcp_timeout_established($hostfw_conf);
3519
3520 }
3521
3522 sub update_nf_conntrack_max {
3523 my ($hostfw_conf) = @_;
3524
3525 my $max = 65536; # reasonable default
3526
3527 my $options = $hostfw_conf->{options} || {};
3528
3529 if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
3530 $max = $options->{nf_conntrack_max};
3531 $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
3532 }
3533
3534 my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
3535 my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
3536
3537 my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
3538
3539 if ($current != $max) {
3540 my $hashsize = int($max/4);
3541 PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
3542 PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
3543 }
3544 }
3545
3546 sub update_nf_conntrack_tcp_timeout_established {
3547 my ($hostfw_conf) = @_;
3548
3549 my $options = $hostfw_conf->{options} || {};
3550
3551 my $value = defined($options->{nf_conntrack_tcp_timeout_established}) ? $options->{nf_conntrack_tcp_timeout_established} : 432000;
3552
3553 PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established", $value);
3554 }
3555
3556 sub remove_pvefw_chains {
3557
3558 PVE::Firewall::remove_pvefw_chains_iptables("iptables");
3559 PVE::Firewall::remove_pvefw_chains_iptables("ip6tables");
3560 PVE::Firewall::remove_pvefw_chains_ipset();
3561
3562 }
3563
3564 sub remove_pvefw_chains_iptables {
3565 my ($iptablescmd) = @_;
3566
3567 my ($chash, $hooks) = iptables_get_chains($iptablescmd);
3568 my $cmdlist = "*filter\n";
3569
3570 foreach my $h (qw(INPUT OUTPUT FORWARD)) {
3571 if ($hooks->{$h}) {
3572 $cmdlist .= "-D $h -j PVEFW-$h\n";
3573 }
3574 }
3575
3576 foreach my $chain (keys %$chash) {
3577 $cmdlist .= "-F $chain\n";
3578 }
3579
3580 foreach my $chain (keys %$chash) {
3581 $cmdlist .= "-X $chain\n";
3582 }
3583 $cmdlist .= "COMMIT\n";
3584
3585 if($iptablescmd eq "ip6tables") {
3586 ip6tables_restore_cmdlist($cmdlist);
3587 } else {
3588 iptables_restore_cmdlist($cmdlist);
3589 }
3590 }
3591
3592 sub remove_pvefw_chains_ipset {
3593
3594 my $ipset_chains = ipset_get_chains();
3595
3596 my $cmdlist = "";
3597
3598 foreach my $chain (keys %$ipset_chains) {
3599 $cmdlist .= "flush $chain\n";
3600 $cmdlist .= "destroy $chain\n";
3601 }
3602
3603 ipset_restore_cmdlist($cmdlist) if $cmdlist;
3604 }
3605
3606 sub init {
3607 my $cluster_conf = load_clusterfw_conf();
3608 my $cluster_options = $cluster_conf->{options};
3609 my $enable = $cluster_options->{enable};
3610
3611 return if !$enable;
3612
3613 # load required modules here
3614 }
3615
3616 sub update {
3617 my $code = sub {
3618
3619 my $cluster_conf = load_clusterfw_conf();
3620 my $cluster_options = $cluster_conf->{options};
3621
3622 if (!$cluster_options->{enable}) {
3623 PVE::Firewall::remove_pvefw_chains();
3624 return;
3625 }
3626
3627 my $hostfw_conf = load_hostfw_conf($cluster_conf);
3628
3629 my ($ruleset, $ipset_ruleset, $rulesetv6) = compile($cluster_conf, $hostfw_conf);
3630
3631 apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6);
3632 };
3633
3634 run_locked($code);
3635 }
3636
3637 1;
Firewall test scripts