src/PVE/Firewall.pm

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