src/PVE/Firewall.pm

   1 package PVE::Firewall;
   2
   3 use warnings;
   4 use strict;
   5 use POSIX;
   6 use Data::Dumper;
   7 use Digest::SHA;
   8 use Socket qw(AF_INET6 inet_ntop inet_pton);
   9 use PVE::INotify;
  10 use PVE::Exception qw(raise raise_param_exc);
  11 use PVE::JSONSchema qw(register_standard_option get_standard_option);
  12 use PVE::Cluster;
  13 use PVE::ProcFSTools;
  14 use PVE::Tools qw($IPV4RE $IPV6RE);
  15 use File::Basename;
  16 use File::Path;
  17 use IO::File;
  18 use Net::IP;
  19 use PVE::Tools qw(run_command lock_file dir_glob_foreach);
  20 use Encode;
  21
  22 my $hostfw_conf_filename = "/etc/pve/local/host.fw";
  23 my $pvefw_conf_dir = "/etc/pve/firewall";
  24 my $clusterfw_conf_filename = "$pvefw_conf_dir/cluster.fw";
  25
  26 # dynamically include PVE::QemuServer and PVE::LXC
  27 # to avoid dependency problems
  28 my $have_qemu_server;
  29 eval {
  30     require PVE::QemuServer;
  31     $have_qemu_server = 1;
  32 };
  33
  34 my $have_lxc;
  35 eval {
  36     require PVE::LXC;
  37     $have_lxc = 1;
  38 };
  39
  40
  41 my $pve_fw_status_dir = "/var/lib/pve-firewall";
  42
  43 mkdir $pve_fw_status_dir; # make sure this exists
  44
  45 my $security_group_name_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  46 my $ipset_name_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  47 our $ip_alias_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  48
  49 my $max_alias_name_length = 64;
  50 my $max_ipset_name_length = 64;
  51 my $max_group_name_length = 20;
  52
  53 PVE::JSONSchema::register_format('IPorCIDR', \&pve_verify_ip_or_cidr);
  54 sub pve_verify_ip_or_cidr {
  55     my ($cidr, $noerr) = @_;
  56
  57     if ($cidr =~ m!^(?:$IPV6RE|$IPV4RE)(/(\d+))?$!) {
  58         return $cidr if Net::IP->new($cidr);
  59         return undef if $noerr;
  60         die Net::IP::Error() . "\n";
  61     }
  62     return undef if $noerr;
  63     die "value does not look like a valid IP address or CIDR network\n";
  64 }
  65
  66 PVE::JSONSchema::register_format('IPorCIDRorAlias', \&pve_verify_ip_or_cidr_or_alias);
  67 sub pve_verify_ip_or_cidr_or_alias {
  68     my ($cidr, $noerr) = @_;
  69
  70     return if $cidr =~ m/^(?:$ip_alias_pattern)$/;
  71
  72     return pve_verify_ip_or_cidr($cidr, $noerr);
  73 }
  74
  75 PVE::JSONSchema::register_standard_option('ipset-name', {
  76     description => "IP set name.",
  77     type => 'string',
  78     pattern => $ipset_name_pattern,
  79     minLength => 2,
  80     maxLength => $max_ipset_name_length,
  81 });
  82
  83 PVE::JSONSchema::register_standard_option('pve-fw-alias', {
  84     description => "Alias name.",
  85     type => 'string',
  86     pattern => $ip_alias_pattern,
  87     minLength => 2,
  88     maxLength => $max_alias_name_length,
  89 });
  90
  91 PVE::JSONSchema::register_standard_option('pve-fw-loglevel' => {
  92     description => "Log level.",
  93     type => 'string',
  94     enum => ['emerg', 'alert', 'crit', 'err', 'warning', 'notice', 'info', 'debug', 'nolog'],
  95     optional => 1,
  96 });
  97
  98 PVE::JSONSchema::register_standard_option('pve-security-group-name', {
  99     description => "Security Group name.",
 100     type => 'string',
 101     pattern => $security_group_name_pattern,
 102     minLength => 2,
 103     maxLength => $max_group_name_length,
 104 });
 105
 106 my $feature_ipset_nomatch = 0;
 107 eval  {
 108     my (undef, undef, $release) = POSIX::uname();
 109     if ($release =~ m/^(\d+)\.(\d+)\.\d+-/) {
 110         my ($major, $minor) = ($1, $2);
 111         $feature_ipset_nomatch = 1 if ($major > 3) ||
 112             ($major == 3 && $minor >= 7);
 113     }
 114
 115 };
 116
 117 my $nodename = PVE::INotify::nodename();
 118
 119 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
 120
 121 my $default_log_level = 'nolog'; # avoid logs by default
 122
 123 my $log_level_hash = {
 124     debug => 7,
 125     info => 6,
 126     notice => 5,
 127     warning => 4,
 128     err => 3,
 129     crit => 2,
 130     alert => 1,
 131     emerg => 0,
 132 };
 133
 134 # we need to overwrite some macros for ipv6
 135 my $pve_ipv6fw_macros = {
 136     'Ping' => [
 137         { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
 138     ],
 139     'NeighborDiscovery' => [
 140         "IPv6 neighbor solicitation, neighbor and router advertisement",
 141         { action => 'PARAM', proto => 'icmpv6', dport => 'router-advertisement' },
 142         { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-solicitation' },
 143         { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-advertisement' },
 144     ],
 145     'DHCPv6' => [
 146         { action => 'PARAM', proto => 'udp', dport => '546:547', sport => '546:547' },
 147     ],
 148     'Trcrt' => [
 149         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 150         { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
 151     ],
 152  };
 153
 154 # imported/converted from: /usr/share/shorewall/macro.*
 155 my $pve_fw_macros = {
 156     'Amanda' => [
 157         "Amanda Backup",
 158         { action => 'PARAM', proto => 'udp', dport => '10080' },
 159         { action => 'PARAM', proto => 'tcp', dport => '10080' },
 160     ],
 161     'Auth' => [
 162         "Auth (identd) traffic",
 163         { action => 'PARAM', proto => 'tcp', dport => '113' },
 164     ],
 165     'BGP' => [
 166         "Border Gateway Protocol traffic",
 167         { action => 'PARAM', proto => 'tcp', dport => '179' },
 168     ],
 169     'BitTorrent' => [
 170         "BitTorrent traffic for BitTorrent 3.1 and earlier",
 171         { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
 172         { action => 'PARAM', proto => 'udp', dport => '6881' },
 173     ],
 174     'BitTorrent32' => [
 175         "BitTorrent traffic for BitTorrent 3.2 and later",
 176         { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
 177         { action => 'PARAM', proto => 'udp', dport => '6881' },
 178     ],
 179     'Ceph' => [
 180         "Ceph Storage Cluster traffic (Ceph Monitors, OSD & MDS Deamons)",
 181         { action => 'PARAM', proto => 'tcp', dport => '6789' },
 182         { action => 'PARAM', proto => 'tcp', dport => '6800:7300' },
 183     ],
 184     'CVS' => [
 185         "Concurrent Versions System pserver traffic",
 186         { action => 'PARAM', proto => 'tcp', dport => '2401' },
 187     ],
 188     'Citrix' => [
 189         "Citrix/ICA traffic (ICA, ICA Browser, CGP)",
 190         { action => 'PARAM', proto => 'tcp', dport => '1494' },
 191         { action => 'PARAM', proto => 'udp', dport => '1604' },
 192         { action => 'PARAM', proto => 'tcp', dport => '2598' },
 193     ],
 194     'DAAP' => [
 195         "Digital Audio Access Protocol traffic (iTunes, Rythmbox daemons)",
 196         { action => 'PARAM', proto => 'tcp', dport => '3689' },
 197         { action => 'PARAM', proto => 'udp', dport => '3689' },
 198     ],
 199     'DCC' => [
 200         "Distributed Checksum Clearinghouse spam filtering mechanism",
 201         { action => 'PARAM', proto => 'tcp', dport => '6277' },
 202     ],
 203     'DHCPfwd' => [
 204         "Forwarded DHCP traffic",
 205         { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
 206     ],
 207     'DNS' => [
 208         "Domain Name System traffic (upd and tcp)",
 209         { action => 'PARAM', proto => 'udp', dport => '53' },
 210         { action => 'PARAM', proto => 'tcp', dport => '53' },
 211     ],
 212     'Distcc' => [
 213         "Distributed Compiler service",
 214         { action => 'PARAM', proto => 'tcp', dport => '3632' },
 215     ],
 216     'FTP' => [
 217         "File Transfer Protocol",
 218         { action => 'PARAM', proto => 'tcp', dport => '21' },
 219     ],
 220     'Finger' => [
 221         "Finger protocol (RFC 742)",
 222         { action => 'PARAM', proto => 'tcp', dport => '79' },
 223     ],
 224     'GNUnet' => [
 225         "GNUnet secure peer-to-peer networking traffic",
 226         { action => 'PARAM', proto => 'tcp', dport => '2086' },
 227         { action => 'PARAM', proto => 'udp', dport => '2086' },
 228         { action => 'PARAM', proto => 'tcp', dport => '1080' },
 229         { action => 'PARAM', proto => 'udp', dport => '1080' },
 230     ],
 231     'GRE' => [
 232         "Generic Routing Encapsulation tunneling protocol",
 233         { action => 'PARAM', proto => '47' },
 234     ],
 235     'Git' => [
 236         "Git distributed revision control traffic",
 237         { action => 'PARAM', proto => 'tcp', dport => '9418' },
 238     ],
 239     'HKP' => [
 240         "OpenPGP HTTP keyserver protocol traffic",
 241         { action => 'PARAM', proto => 'tcp', dport => '11371' },
 242     ],
 243     'HTTP' => [
 244         "Hypertext Transfer Protocol (WWW)",
 245         { action => 'PARAM', proto => 'tcp', dport => '80' },
 246     ],
 247     'HTTPS' => [
 248         "Hypertext Transfer Protocol (WWW) over SSL",
 249         { action => 'PARAM', proto => 'tcp', dport => '443' },
 250     ],
 251     'ICPV2' => [
 252         "Internet Cache Protocol V2 (Squid) traffic",
 253         { action => 'PARAM', proto => 'udp', dport => '3130' },
 254     ],
 255     'ICQ' => [
 256         "AOL Instant Messenger traffic",
 257         { action => 'PARAM', proto => 'tcp', dport => '5190' },
 258     ],
 259     'IMAP' => [
 260         "Internet Message Access Protocol",
 261         { action => 'PARAM', proto => 'tcp', dport => '143' },
 262     ],
 263     'IMAPS' => [
 264         "Internet Message Access Protocol over SSL",
 265         { action => 'PARAM', proto => 'tcp', dport => '993' },
 266     ],
 267     'IPIP' => [
 268         "IPIP capsulation traffic",
 269         { action => 'PARAM', proto => '94' },
 270     ],
 271     'IPsec' => [
 272         "IPsec traffic",
 273         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 274         { action => 'PARAM', proto => '50' },
 275     ],
 276     'IPsecah' => [
 277         "IPsec authentication (AH) traffic",
 278         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 279         { action => 'PARAM', proto => '51' },
 280     ],
 281     'IPsecnat' => [
 282         "IPsec traffic and Nat-Traversal",
 283         { action => 'PARAM', proto => 'udp', dport => '500' },
 284         { action => 'PARAM', proto => 'udp', dport => '4500' },
 285         { action => 'PARAM', proto => '50' },
 286     ],
 287     'IRC' => [
 288         "Internet Relay Chat traffic",
 289         { action => 'PARAM', proto => 'tcp', dport => '6667' },
 290     ],
 291     'Jetdirect' => [
 292         "HP Jetdirect printing",
 293         { action => 'PARAM', proto => 'tcp', dport => '9100' },
 294     ],
 295     'L2TP' => [
 296         "Layer 2 Tunneling Protocol traffic",
 297         { action => 'PARAM', proto => 'udp', dport => '1701' },
 298     ],
 299     'LDAP' => [
 300         "Lightweight Directory Access Protocol traffic",
 301         { action => 'PARAM', proto => 'tcp', dport => '389' },
 302     ],
 303     'LDAPS' => [
 304         "Secure Lightweight Directory Access Protocol traffic",
 305         { action => 'PARAM', proto => 'tcp', dport => '636' },
 306     ],
 307     'MSNP' => [
 308         "Microsoft Notification Protocol",
 309         { action => 'PARAM', proto => 'tcp', dport => '1863' },
 310     ],
 311     'MSSQL' => [
 312         "Microsoft SQL Server",
 313         { action => 'PARAM', proto => 'tcp', dport => '1433' },
 314     ],
 315     'Mail' => [
 316         "Mail traffic (SMTP, SMTPS, Submission)",
 317         { action => 'PARAM', proto => 'tcp', dport => '25' },
 318         { action => 'PARAM', proto => 'tcp', dport => '465' },
 319         { action => 'PARAM', proto => 'tcp', dport => '587' },
 320     ],
 321     'Munin' => [
 322         "Munin networked resource monitoring traffic",
 323         { action => 'PARAM', proto => 'tcp', dport => '4949' },
 324     ],
 325     'MySQL' => [
 326         "MySQL server",
 327         { action => 'PARAM', proto => 'tcp', dport => '3306' },
 328     ],
 329     'NNTP' => [
 330         "NNTP traffic (Usenet).",
 331         { action => 'PARAM', proto => 'tcp', dport => '119' },
 332     ],
 333     'NNTPS' => [
 334         "Encrypted NNTP traffic (Usenet)",
 335         { action => 'PARAM', proto => 'tcp', dport => '563' },
 336     ],
 337     'NTP' => [
 338         "Network Time Protocol (ntpd)",
 339         { action => 'PARAM', proto => 'udp', dport => '123' },
 340     ],
 341     'OSPF' => [
 342         "OSPF multicast traffic",
 343         { action => 'PARAM', proto => '89' },
 344     ],
 345     'OpenVPN' => [
 346         "OpenVPN traffic",
 347         { action => 'PARAM', proto => 'udp', dport => '1194' },
 348     ],
 349     'PCA' => [
 350         "Symantec PCAnywere (tm)",
 351         { action => 'PARAM', proto => 'udp', dport => '5632' },
 352         { action => 'PARAM', proto => 'tcp', dport => '5631' },
 353     ],
 354     'POP3' => [
 355         "POP3 traffic",
 356         { action => 'PARAM', proto => 'tcp', dport => '110' },
 357     ],
 358     'POP3S' => [
 359         "Encrypted POP3 traffic",
 360         { action => 'PARAM', proto => 'tcp', dport => '995' },
 361     ],
 362     'PPtP' => [
 363         "Point-to-Point Tunneling Protocol",
 364         { action => 'PARAM', proto => '47' },
 365         { action => 'PARAM', proto => 'tcp', dport => '1723' },
 366     ],
 367     'Ping' => [
 368         "ICMP echo request",
 369         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 370     ],
 371     'PostgreSQL' => [
 372         "PostgreSQL server",
 373         { action => 'PARAM', proto => 'tcp', dport => '5432' },
 374     ],
 375     'Printer' => [
 376         "Line Printer protocol printing",
 377         { action => 'PARAM', proto => 'tcp', dport => '515' },
 378     ],
 379     'RDP' => [
 380         "Microsoft Remote Desktop Protocol traffic",
 381         { action => 'PARAM', proto => 'tcp', dport => '3389' },
 382     ],
 383     'RIP' => [
 384         "Routing Information Protocol (bidirectional)",
 385         { action => 'PARAM', proto => 'udp', dport => '520' },
 386     ],
 387     'RNDC' => [
 388         "BIND remote management protocol",
 389         { action => 'PARAM', proto => 'tcp', dport => '953' },
 390     ],
 391     'Razor' => [
 392         "Razor Antispam System",
 393         { action => 'ACCEPT', proto => 'tcp', dport => '2703' },
 394     ],
 395     'Rdate' => [
 396         "Remote time retrieval (rdate)",
 397         { action => 'PARAM', proto => 'tcp', dport => '37' },
 398     ],
 399     'Rsync' => [
 400         "Rsync server",
 401         { action => 'PARAM', proto => 'tcp', dport => '873' },
 402     ],
 403     'SANE' => [
 404         "SANE network scanning",
 405         { action => 'PARAM', proto => 'tcp', dport => '6566' },
 406     ],
 407     'SMB' => [
 408         "Microsoft SMB traffic",
 409         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 410         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 411         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 412         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 413     ],
 414     'SMBswat' => [
 415         "Samba Web Administration Tool",
 416         { action => 'PARAM', proto => 'tcp', dport => '901' },
 417     ],
 418     'SMTP' => [
 419         "Simple Mail Transfer Protocol",
 420         { action => 'PARAM', proto => 'tcp', dport => '25' },
 421     ],
 422     'SMTPS' => [
 423         "Encrypted Simple Mail Transfer Protocol",
 424         { action => 'PARAM', proto => 'tcp', dport => '465' },
 425     ],
 426     'SNMP' => [
 427         "Simple Network Management Protocol",
 428         { action => 'PARAM', proto => 'udp', dport => '161:162' },
 429         { action => 'PARAM', proto => 'tcp', dport => '161' },
 430     ],
 431     'SPAMD' => [
 432         "Spam Assassin SPAMD traffic",
 433         { action => 'PARAM', proto => 'tcp', dport => '783' },
 434     ],
 435     'SSH' => [
 436         "Secure shell traffic",
 437         { action => 'PARAM', proto => 'tcp', dport => '22' },
 438     ],
 439     'SVN' => [
 440         "Subversion server (svnserve)",
 441         { action => 'PARAM', proto => 'tcp', dport => '3690' },
 442     ],
 443     'SixXS' => [
 444         "SixXS IPv6 Deployment and Tunnel Broker",
 445         { action => 'PARAM', proto => 'tcp', dport => '3874' },
 446         { action => 'PARAM', proto => 'udp', dport => '3740' },
 447         { action => 'PARAM', proto => '41' },
 448         { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
 449     ],
 450     'Squid' => [
 451         "Squid web proxy traffic",
 452         { action => 'PARAM', proto => 'tcp', dport => '3128' },
 453     ],
 454     'Submission' => [
 455         "Mail message submission traffic",
 456         { action => 'PARAM', proto => 'tcp', dport => '587' },
 457     ],
 458     'Syslog' => [
 459         "Syslog protocol (RFC 5424) traffic",
 460         { action => 'PARAM', proto => 'udp', dport => '514' },
 461         { action => 'PARAM', proto => 'tcp', dport => '514' },
 462     ],
 463     'TFTP' => [
 464         "Trivial File Transfer Protocol traffic",
 465         { action => 'PARAM', proto => 'udp', dport => '69' },
 466     ],
 467     'Telnet' => [
 468         "Telnet traffic",
 469         { action => 'PARAM', proto => 'tcp', dport => '23' },
 470     ],
 471     'Telnets' => [
 472         "Telnet over SSL",
 473         { action => 'PARAM', proto => 'tcp', dport => '992' },
 474     ],
 475     'Time' => [
 476         "RFC 868 Time protocol",
 477         { action => 'PARAM', proto => 'tcp', dport => '37' },
 478     ],
 479     'Trcrt' => [
 480         "Traceroute (for up to 30 hops) traffic",
 481         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 482         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 483     ],
 484     'VNC' => [
 485         "VNC traffic for VNC display's 0 - 99",
 486         { action => 'PARAM', proto => 'tcp', dport => '5900:5999' },
 487     ],
 488     'VNCL' => [
 489         "VNC traffic from Vncservers to Vncviewers in listen mode",
 490         { action => 'PARAM', proto => 'tcp', dport => '5500' },
 491     ],
 492     'Web' => [
 493         "WWW traffic (HTTP and HTTPS)",
 494         { action => 'PARAM', proto => 'tcp', dport => '80' },
 495         { action => 'PARAM', proto => 'tcp', dport => '443' },
 496     ],
 497     'Webcache' => [
 498         "Web Cache/Proxy traffic (port 8080)",
 499         { action => 'PARAM', proto => 'tcp', dport => '8080' },
 500     ],
 501     'Webmin' => [
 502         "Webmin traffic",
 503         { action => 'PARAM', proto => 'tcp', dport => '10000' },
 504     ],
 505     'Whois' => [
 506         "Whois (nicname, RFC 3912) traffic",
 507         { action => 'PARAM', proto => 'tcp', dport => '43' },
 508     ],
 509 };
 510
 511 my $pve_fw_parsed_macros;
 512 my $pve_fw_macro_descr;
 513 my $pve_fw_macro_ipversion = {};
 514 my $pve_fw_preferred_macro_names = {};
 515
 516 my $pve_std_chains = {};
 517 $pve_std_chains->{4} = {
 518     'PVEFW-SET-ACCEPT-MARK' => [
 519         "-j MARK --set-mark 1",
 520     ],
 521     'PVEFW-DropBroadcast' => [
 522         # same as shorewall 'Broadcast'
 523         # simply DROP BROADCAST/MULTICAST/ANYCAST
 524         # we can use this to reduce logging
 525         { action => 'DROP', dsttype => 'BROADCAST' },
 526         { action => 'DROP', dsttype => 'MULTICAST' },
 527         { action => 'DROP', dsttype => 'ANYCAST' },
 528         { action => 'DROP', dest => '224.0.0.0/4' },
 529     ],
 530     'PVEFW-reject' => [
 531         # same as shorewall 'reject'
 532         { action => 'DROP', dsttype => 'BROADCAST' },
 533         { action => 'DROP', source => '224.0.0.0/4' },
 534         { action => 'DROP', proto => 'icmp' },
 535         "-p tcp -j REJECT --reject-with tcp-reset",
 536         "-p udp -j REJECT --reject-with icmp-port-unreachable",
 537         "-p icmp -j REJECT --reject-with icmp-host-unreachable",
 538         "-j REJECT --reject-with icmp-host-prohibited",
 539     ],
 540     'PVEFW-Drop' => [
 541         # same as shorewall 'Drop', which is equal to DROP,
 542         # but REJECT/DROP some packages to reduce logging,
 543         # and ACCEPT critical ICMP types
 544         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 545         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 546         { action => 'PVEFW-DropBroadcast' },
 547         # ACCEPT critical ICMP types
 548         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 549         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 550         # Drop packets with INVALID state
 551         "-m conntrack --ctstate INVALID -j DROP",
 552         # Drop Microsoft SMB noise
 553         { action => 'DROP', proto => 'udp', dport => '135,445', nbdport => 2 },
 554         { action => 'DROP', proto => 'udp', dport => '137:139'},
 555         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 556         { action => 'DROP', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
 557         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 558         # Drop new/NotSyn traffic so that it doesn't get logged
 559         "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
 560         # Drop DNS replies
 561         { action => 'DROP', proto => 'udp', sport => 53 },
 562     ],
 563     'PVEFW-Reject' => [
 564         # same as shorewall 'Reject', which is equal to Reject,
 565         # but REJECT/DROP some packages to reduce logging,
 566         # and ACCEPT critical ICMP types
 567         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 568         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 569         { action => 'PVEFW-DropBroadcast' },
 570         # ACCEPT critical ICMP types
 571         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 572         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 573         # Drop packets with INVALID state
 574         "-m conntrack --ctstate INVALID -j DROP",
 575         # Drop Microsoft SMB noise
 576         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445', nbdport => 2 },
 577         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
 578         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 579         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
 580         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 581         # Drop new/NotSyn traffic so that it doesn't get logged
 582         "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
 583         # Drop DNS replies
 584         { action => 'DROP', proto => 'udp', sport => 53 },
 585     ],
 586     'PVEFW-tcpflags' => [
 587         # same as shorewall tcpflags action.
 588         # Packets arriving on this interface are checked for som illegal combinations of TCP flags
 589         "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
 590         "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
 591         "-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
 592         "-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
 593         "-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
 594     ],
 595     'PVEFW-smurfs' => [
 596         # same as shorewall smurfs action
 597         # Filter packets for smurfs (packets with a broadcast address as the source).
 598         "-s 0.0.0.0/32 -j RETURN", # allow DHCP
 599         "-m addrtype --src-type BROADCAST -g PVEFW-smurflog",
 600         "-s 224.0.0.0/4 -g PVEFW-smurflog",
 601     ],
 602 };
 603
 604 $pve_std_chains->{6} = {
 605     'PVEFW-SET-ACCEPT-MARK' => [
 606         "-j MARK --set-mark 1",
 607     ],
 608     'PVEFW-DropBroadcast' => [
 609         # same as shorewall 'Broadcast'
 610         # simply DROP BROADCAST/MULTICAST/ANYCAST
 611         # we can use this to reduce logging
 612         #{ action => 'DROP', dsttype => 'BROADCAST' }, #no broadcast in ipv6
 613         # ipv6 addrtype does not work with kernel 2.6.32
 614         #{ action => 'DROP', dsttype => 'MULTICAST' },
 615         #{ action => 'DROP', dsttype => 'ANYCAST' },
 616         { action => 'DROP', dest => 'ff00::/8' },
 617         #{ action => 'DROP', dest => '224.0.0.0/4' },
 618     ],
 619     'PVEFW-reject' => [
 620         # same as shorewall 'reject'
 621         #{ action => 'DROP', dsttype => 'BROADCAST' },
 622         #{ action => 'DROP', source => '224.0.0.0/4' },
 623         { action => 'DROP', proto => 'icmpv6' },
 624         "-p tcp -j REJECT --reject-with tcp-reset",
 625         #"-p udp -j REJECT --reject-with icmp-port-unreachable",
 626         #"-p icmp -j REJECT --reject-with icmp-host-unreachable",
 627         #"-j REJECT --reject-with icmp-host-prohibited",
 628     ],
 629     'PVEFW-Drop' => [
 630         # same as shorewall 'Drop', which is equal to DROP,
 631         # but REJECT/DROP some packages to reduce logging,
 632         # and ACCEPT critical ICMP types
 633         { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
 634         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 635         { action => 'PVEFW-DropBroadcast' },
 636         # ACCEPT critical ICMP types
 637         { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
 638         { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
 639         { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
 640
 641         # Drop packets with INVALID state
 642         "-m conntrack --ctstate INVALID -j DROP",
 643         # Drop Microsoft SMB noise
 644         { action => 'DROP', proto => 'udp', dport => '135,445', nbdport => 2 },
 645         { action => 'DROP', proto => 'udp', dport => '137:139'},
 646         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 647         { action => 'DROP', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
 648         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 649         # Drop new/NotSyn traffic so that it doesn't get logged
 650         "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
 651         # Drop DNS replies
 652         { action => 'DROP', proto => 'udp', sport => 53 },
 653     ],
 654     'PVEFW-Reject' => [
 655         # same as shorewall 'Reject', which is equal to Reject,
 656         # but REJECT/DROP some packages to reduce logging,
 657         # and ACCEPT critical ICMP types
 658         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 659         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 660         { action => 'PVEFW-DropBroadcast' },
 661         # ACCEPT critical ICMP types
 662         { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
 663         { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
 664         { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
 665
 666         # Drop packets with INVALID state
 667         "-m conntrack --ctstate INVALID -j DROP",
 668         # Drop Microsoft SMB noise
 669         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445', nbdport => 2 },
 670         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
 671         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 672         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
 673         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 674         # Drop new/NotSyn traffic so that it doesn't get logged
 675         "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
 676         # Drop DNS replies
 677         { action => 'DROP', proto => 'udp', sport => 53 },
 678     ],
 679     'PVEFW-tcpflags' => [
 680         # same as shorewall tcpflags action.
 681         # Packets arriving on this interface are checked for som illegal combinations of TCP flags
 682         "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
 683         "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
 684         "-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
 685         "-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
 686         "-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
 687     ],
 688 };
 689
 690 # iptables -p icmp -h
 691 my $icmp_type_names = {
 692     any => 1,
 693     'echo-reply' => 1,
 694     'destination-unreachable' => 1,
 695     'network-unreachable' => 1,
 696     'host-unreachable' => 1,
 697     'protocol-unreachable' => 1,
 698     'port-unreachable' => 1,
 699     'fragmentation-needed' => 1,
 700     'source-route-failed' => 1,
 701     'network-unknown' => 1,
 702     'host-unknown' => 1,
 703     'network-prohibited' => 1,
 704     'host-prohibited' => 1,
 705     'TOS-network-unreachable' => 1,
 706     'TOS-host-unreachable' => 1,
 707     'communication-prohibited' => 1,
 708     'host-precedence-violation' => 1,
 709     'precedence-cutoff' => 1,
 710     'source-quench' => 1,
 711     'redirect' => 1,
 712     'network-redirect' => 1,
 713     'host-redirect' => 1,
 714     'TOS-network-redirect' => 1,
 715     'TOS-host-redirect' => 1,
 716     'echo-request' => 1,
 717     'router-advertisement' => 1,
 718     'router-solicitation' => 1,
 719     'time-exceeded' => 1,
 720     'ttl-zero-during-transit' => 1,
 721     'ttl-zero-during-reassembly' => 1,
 722     'parameter-problem' => 1,
 723     'ip-header-bad' => 1,
 724     'required-option-missing' => 1,
 725     'timestamp-request' => 1,
 726     'timestamp-reply' => 1,
 727     'address-mask-request' => 1,
 728     'address-mask-reply' => 1,
 729 };
 730
 731 # ip6tables -p icmpv6 -h
 732
 733 my $icmpv6_type_names = {
 734     'any' => 1,
 735     'destination-unreachable' => 1,
 736     'no-route' => 1,
 737     'communication-prohibited' => 1,
 738     'address-unreachable' => 1,
 739     'port-unreachable' => 1,
 740     'packet-too-big' => 1,
 741     'time-exceeded' => 1,
 742     'ttl-zero-during-transit' => 1,
 743     'ttl-zero-during-reassembly' => 1,
 744     'parameter-problem' => 1,
 745     'bad-header' => 1,
 746     'unknown-header-type' => 1,
 747     'unknown-option' => 1,
 748     'echo-request' => 1,
 749     'echo-reply' => 1,
 750     'router-solicitation' => 1,
 751     'router-advertisement' => 1,
 752     'neighbor-solicitation' => 1,
 753     'neighbour-solicitation' => 1,
 754     'neighbor-advertisement' => 1,
 755     'neighbour-advertisement' => 1,
 756     'redirect' => 1,
 757 };
 758
 759 sub init_firewall_macros {
 760
 761     $pve_fw_parsed_macros = {};
 762
 763     my $parse = sub {
 764         my ($k, $macro) = @_;
 765         my $lc_name = lc($k);
 766         $pve_fw_macro_ipversion->{$k} = 0;
 767         while (!ref($macro->[0])) {
 768             my $desc = shift @$macro;
 769             if ($desc eq 'ipv4only') {
 770                 $pve_fw_macro_ipversion->{$k} = 4;
 771             } elsif ($desc eq 'ipv6only') {
 772                 $pve_fw_macro_ipversion->{$k} = 6;
 773             } else {
 774                 $pve_fw_macro_descr->{$k} = $desc;
 775             }
 776         }
 777         $pve_fw_preferred_macro_names->{$lc_name} = $k;
 778         $pve_fw_parsed_macros->{$k} = $macro;
 779     };
 780
 781     foreach my $k (keys %$pve_fw_macros) {
 782         &$parse($k, $pve_fw_macros->{$k});
 783     }
 784
 785     foreach my $k (keys %$pve_ipv6fw_macros) {
 786         next if $pve_fw_parsed_macros->{$k};
 787         &$parse($k, $pve_ipv6fw_macros->{$k});
 788         $pve_fw_macro_ipversion->{$k} = 6;
 789     }
 790 }
 791
 792 init_firewall_macros();
 793
 794 sub get_macros {
 795     return wantarray ? ($pve_fw_parsed_macros, $pve_fw_macro_descr): $pve_fw_parsed_macros;
 796 }
 797
 798 my $etc_services;
 799
 800 sub get_etc_services {
 801
 802     return $etc_services if $etc_services;
 803
 804     my $filename = "/etc/services";
 805
 806     my $fh = IO::File->new($filename, O_RDONLY);
 807     if (!$fh) {
 808         warn "unable to read '$filename' - $!\n";
 809         return {};
 810     }
 811
 812     my $services = {};
 813
 814     while (my $line = <$fh>) {
 815         chomp ($line);
 816         next if $line =~m/^#/;
 817         next if ($line =~m/^\s*$/);
 818
 819         if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp).*$!) {
 820             $services->{byid}->{$2}->{name} = $1;
 821             $services->{byid}->{$2}->{port} = $2;
 822             $services->{byid}->{$2}->{$3} = 1;
 823             $services->{byname}->{$1} = $services->{byid}->{$2};
 824         }
 825     }
 826
 827     close($fh);
 828
 829     $etc_services = $services;
 830
 831
 832     return $etc_services;
 833 }
 834
 835 my $etc_protocols;
 836
 837 sub get_etc_protocols {
 838     return $etc_protocols if $etc_protocols;
 839
 840     my $filename = "/etc/protocols";
 841
 842     my $fh = IO::File->new($filename, O_RDONLY);
 843     if (!$fh) {
 844         warn "unable to read '$filename' - $!\n";
 845         return {};
 846     }
 847
 848     my $protocols = {};
 849
 850     while (my $line = <$fh>) {
 851         chomp ($line);
 852         next if $line =~m/^#/;
 853         next if ($line =~m/^\s*$/);
 854
 855         if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
 856             $protocols->{byid}->{$2}->{name} = $1;
 857             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
 858         }
 859     }
 860
 861     close($fh);
 862
 863     # add special case for ICMP v6
 864     $protocols->{byid}->{icmpv6}->{name} = "icmpv6";
 865     $protocols->{byname}->{icmpv6} = $protocols->{byid}->{icmpv6};
 866
 867     $etc_protocols = $protocols;
 868
 869     return $etc_protocols;
 870 }
 871
 872 my $ipv4_mask_hash_localnet = {
 873     '255.255.0.0' => 16,
 874     '255.255.128.0' => 17,
 875     '255.255.192.0' => 18,
 876     '255.255.224.0' => 19,
 877     '255.255.240.0' => 20,
 878     '255.255.248.0' => 21,
 879     '255.255.252.0' => 22,
 880     '255.255.254.0' => 23,
 881     '255.255.255.0' => 24,
 882     '255.255.255.128' => 25,
 883     '255.255.255.192' => 26,
 884     '255.255.255.224' => 27,
 885     '255.255.255.240' => 28,
 886     '255.255.255.248' => 29,
 887     '255.255.255.252' => 30,
 888 };
 889
 890 my $__local_network;
 891
 892 sub local_network {
 893     my ($new_value) = @_;
 894
 895     $__local_network = $new_value if defined($new_value);
 896
 897     return $__local_network if defined($__local_network);
 898
 899     eval {
 900         my $nodename = PVE::INotify::nodename();
 901
 902         my $ip = PVE::Cluster::remote_node_ip($nodename);
 903
 904         my $testip = Net::IP->new($ip);
 905
 906         my $isv6 = $testip->version == 6;
 907         my $routes = $isv6 ? PVE::ProcFSTools::read_proc_net_ipv6_route()
 908                            : PVE::ProcFSTools::read_proc_net_route();
 909         foreach my $entry (@$routes) {
 910             my $mask;
 911             if ($isv6) {
 912                 $mask = $entry->{prefix};
 913             } else {
 914                 $mask = $ipv4_mask_hash_localnet->{$entry->{mask}};
 915                 next if !defined($mask);
 916             }
 917             my $cidr = "$entry->{dest}/$mask";
 918             my $testnet = Net::IP->new($cidr);
 919             if ($testnet->overlaps($testip) == $Net::IP::IP_B_IN_A_OVERLAP) {
 920                 $__local_network = $cidr;
 921                 return;
 922             }
 923         }
 924     };
 925     warn $@ if $@;
 926
 927     return $__local_network;
 928 }
 929
 930 # ipset names are limited to 31 characters,
 931 # and we use '-v4' or '-v6' to indicate IP versions,
 932 # and we use '_swap' suffix for atomic update,
 933 # for example PVEFW-${VMID}-${ipset_name}_swap
 934
 935 my $max_iptables_ipset_name_length = 31 - length("PVEFW-") - length("_swap");
 936
 937 sub compute_ipset_chain_name {
 938     my ($vmid, $ipset_name, $ipversion) = @_;
 939
 940     $vmid = 0 if !defined($vmid);
 941
 942     my $id = "$vmid-${ipset_name}-v$ipversion";
 943
 944     if (length($id) > $max_iptables_ipset_name_length) {
 945         $id = PVE::Tools::fnv31a_hex($id);
 946     }
 947
 948     return "PVEFW-$id";
 949 }
 950
 951 sub compute_ipfilter_ipset_name {
 952     my ($iface) = @_;
 953
 954     return "ipfilter-$iface";
 955 }
 956
 957 sub parse_address_list {
 958     my ($str) = @_;
 959
 960     if ($str =~ m/^(\+)(\S+)$/) { # ipset ref
 961         die "ipset name too long\n" if length($str) > ($max_ipset_name_length + 1);
 962         return;
 963     }
 964
 965     if ($str =~ m/^${ip_alias_pattern}$/) {
 966         die "alias name too long\n" if length($str) > $max_alias_name_length;
 967         return;
 968     }
 969
 970     my $count = 0;
 971     my $iprange = 0;
 972     my $ipversion;
 973
 974     foreach my $elem (split(/,/, $str)) {
 975         $count++;
 976         my $ip = Net::IP->new($elem);
 977         if (!$ip) {
 978             my $err = Net::IP::Error();
 979             die "invalid IP address: $err\n";
 980         }
 981         $iprange = 1 if $elem =~ m/-/;
 982
 983         my $new_ipversion = Net::IP::ip_is_ipv6($ip->ip()) ? 6 : 4;
 984
 985         die "detected mixed ipv4/ipv6 addresses in address list '$str'\n"
 986             if $ipversion && ($new_ipversion != $ipversion);
 987
 988         $ipversion = $new_ipversion;
 989     }
 990
 991     die "you can't use a range in a list\n" if $iprange && $count > 1;
 992
 993     return $ipversion;
 994 }
 995
 996 sub parse_port_name_number_or_range {
 997     my ($str) = @_;
 998
 999     my $services = PVE::Firewall::get_etc_services();
1000     my $count = 0;
1001     my $icmp_port = 0;
1002
1003     foreach my $item (split(/,/, $str)) {
1004         $count++;
1005         if ($item =~ m/^(\d+):(\d+)$/) {
1006             my ($port1, $port2) = ($1, $2);
1007             die "invalid port '$port1'\n" if $port1 > 65535;
1008             die "invalid port '$port2'\n" if $port2 > 65535;
1009         } elsif ($item =~ m/^(\d+)$/) {
1010             my $port = $1;
1011             die "invalid port '$port'\n" if $port > 65535;
1012         } else {
1013             if ($icmp_type_names->{$item}) {
1014                 $icmp_port = 1;
1015             } elsif ($icmpv6_type_names->{$item}) {
1016                 $icmp_port = 1;
1017             } else {
1018                 die "invalid port '$item'\n" if !$services->{byname}->{$item};
1019             }
1020         }
1021     }
1022
1023     die "ICPM ports not allowed in port range\n" if $icmp_port && $count > 1;
1024
1025     return $count;
1026 }
1027
1028 PVE::JSONSchema::register_format('pve-fw-port-spec', \&pve_fw_verify_port_spec);
1029 sub pve_fw_verify_port_spec {
1030    my ($portstr) = @_;
1031
1032    parse_port_name_number_or_range($portstr);
1033
1034    return $portstr;
1035 }
1036
1037 PVE::JSONSchema::register_format('pve-fw-addr-spec', \&pve_fw_verify_addr_spec);
1038 sub pve_fw_verify_addr_spec {
1039    my ($list) = @_;
1040
1041    parse_address_list($list);
1042
1043    return $list;
1044 }
1045
1046 PVE::JSONSchema::register_format('pve-fw-protocol-spec', \&pve_fw_verify_protocol_spec);
1047 sub pve_fw_verify_protocol_spec {
1048    my ($proto) = @_;
1049
1050    my $protocols = get_etc_protocols();
1051
1052    die "unknown protocol '$proto'\n" if $proto &&
1053        !(defined($protocols->{byname}->{$proto}) ||
1054          defined($protocols->{byid}->{$proto}));
1055
1056    return $proto;
1057 }
1058
1059
1060 # helper function for API
1061
1062 sub copy_opject_with_digest {
1063     my ($object) = @_;
1064
1065     my $sha = Digest::SHA->new('sha1');
1066
1067     my $res = {};
1068     foreach my $k (sort keys %$object) {
1069         my $v = $object->{$k};
1070         next if !defined($v);
1071         $res->{$k} = $v;
1072         $sha->add($k, ':', $v, "\n");
1073     }
1074
1075     my $digest = $sha->hexdigest;
1076
1077     $res->{digest} = $digest;
1078
1079     return wantarray ? ($res, $digest) : $res;
1080 }
1081
1082 sub copy_list_with_digest {
1083     my ($list) = @_;
1084
1085     my $sha = Digest::SHA->new('sha1');
1086
1087     my $res = [];
1088     foreach my $entry (@$list) {
1089         my $data = {};
1090         foreach my $k (sort keys %$entry) {
1091             my $v = $entry->{$k};
1092             next if !defined($v);
1093             $data->{$k} = $v;
1094             # Note: digest ignores refs ($rule->{errors})
1095             $sha->add($k, ':', $v, "\n") if !ref($v); ;
1096         }
1097         push @$res, $data;
1098     }
1099
1100     my $digest = $sha->hexdigest;
1101
1102     foreach my $entry (@$res) {
1103         $entry->{digest} = $digest;
1104     }
1105
1106     return wantarray ? ($res, $digest) : $res;
1107 }
1108
1109 my $rule_properties = {
1110     pos => {
1111         description => "Update rule at position <pos>.",
1112         type => 'integer',
1113         minimum => 0,
1114         optional => 1,
1115     },
1116     digest => get_standard_option('pve-config-digest'),
1117     type => {
1118         type => 'string',
1119         optional => 1,
1120         enum => ['in', 'out', 'group'],
1121     },
1122     action => {
1123         description => "Rule action ('ACCEPT', 'DROP', 'REJECT') or security group name.",
1124         type => 'string',
1125         optional => 1,
1126         pattern => $security_group_name_pattern,
1127         maxLength => 20,
1128         minLength => 2,
1129     },
1130     macro => {
1131         type => 'string',
1132         optional => 1,
1133         maxLength => 128,
1134     },
1135     iface => get_standard_option('pve-iface', { optional => 1 }),
1136     source => {
1137         type => 'string', format => 'pve-fw-addr-spec',
1138         optional => 1,
1139     },
1140     dest => {
1141         type => 'string', format => 'pve-fw-addr-spec',
1142         optional => 1,
1143     },
1144     proto => {
1145         type => 'string', format => 'pve-fw-protocol-spec',
1146         optional => 1,
1147     },
1148     enable => {
1149         type => 'integer',
1150         minimum => 0,
1151         optional => 1,
1152     },
1153     sport => {
1154         type => 'string', format => 'pve-fw-port-spec',
1155         optional => 1,
1156     },
1157     dport => {
1158         type => 'string', format => 'pve-fw-port-spec',
1159         optional => 1,
1160     },
1161     comment => {
1162         type => 'string',
1163         optional => 1,
1164     },
1165 };
1166
1167 sub add_rule_properties {
1168     my ($properties) = @_;
1169
1170     foreach my $k (keys %$rule_properties) {
1171         my $h = $rule_properties->{$k};
1172         # copy data, so that we can modify later without side effects
1173         foreach my $opt (keys %$h) { $properties->{$k}->{$opt} = $h->{$opt}; }
1174     }
1175
1176     return $properties;
1177 }
1178
1179 sub delete_rule_properties {
1180     my ($rule, $delete_str) = @_;
1181
1182     foreach my $opt (PVE::Tools::split_list($delete_str)) {
1183         raise_param_exc({ 'delete' => "no such property ('$opt')"})
1184             if !defined($rule_properties->{$opt});
1185         raise_param_exc({ 'delete' => "unable to delete required property '$opt'"})
1186             if $opt eq 'type' || $opt eq 'action';
1187         delete $rule->{$opt};
1188     }
1189
1190     return $rule;
1191 }
1192
1193 my $apply_macro = sub {
1194     my ($macro_name, $param, $verify, $ipversion) = @_;
1195
1196     my $macro_rules = $pve_fw_parsed_macros->{$macro_name};
1197     die "unknown macro '$macro_name'\n" if !$macro_rules; # should not happen
1198
1199     if ($ipversion && ($ipversion == 6) && $pve_ipv6fw_macros->{$macro_name}) {
1200         $macro_rules = $pve_ipv6fw_macros->{$macro_name};
1201     }
1202
1203     # skip macros which are specific to another ipversion
1204     if ($ipversion && (my $required = $pve_fw_macro_ipversion->{$macro_name})) {
1205         return if $ipversion != $required;
1206     }
1207
1208     my $rules = [];
1209
1210     foreach my $templ (@$macro_rules) {
1211         my $rule = {};
1212         my $param_used = {};
1213         foreach my $k (keys %$templ) {
1214             my $v = $templ->{$k};
1215             if ($v eq 'PARAM') {
1216                 $v = $param->{$k};
1217                 $param_used->{$k} = 1;
1218             } elsif ($v eq 'DEST') {
1219                 $v = $param->{dest};
1220                 $param_used->{dest} = 1;
1221             } elsif ($v eq 'SOURCE') {
1222                 $v = $param->{source};
1223                 $param_used->{source} = 1;
1224             }
1225
1226             if (!defined($v)) {
1227                 my $msg = "missing parameter '$k' in macro '$macro_name'";
1228                 raise_param_exc({ macro => $msg }) if $verify;
1229                 die "$msg\n";
1230             }
1231             $rule->{$k} = $v;
1232         }
1233         foreach my $k (keys %$param) {
1234             next if $k eq 'macro';
1235             next if !defined($param->{$k});
1236             next if $param_used->{$k};
1237             if (defined($rule->{$k})) {
1238                 if ($rule->{$k} ne $param->{$k}) {
1239                     my $msg = "parameter '$k' already define in macro (value = '$rule->{$k}')";
1240                     raise_param_exc({ $k => $msg }) if $verify;
1241                     die "$msg\n";
1242                 }
1243             } else {
1244                 $rule->{$k} = $param->{$k};
1245             }
1246         }
1247         push @$rules, $rule;
1248     }
1249
1250     return $rules;
1251 };
1252
1253 my $rule_env_iface_lookup = {
1254     'ct' => 1,
1255     'vm' => 1,
1256     'group' => 0,
1257     'cluster' => 1,
1258     'host' => 1,
1259 };
1260
1261 sub verify_rule {
1262     my ($rule, $cluster_conf, $fw_conf, $rule_env, $noerr) = @_;
1263
1264     my $allow_groups = $rule_env eq 'group' ? 0 : 1;
1265
1266     my $allow_iface = $rule_env_iface_lookup->{$rule_env};
1267     die "unknown rule_env '$rule_env'\n" if !defined($allow_iface); # should not happen
1268
1269     my $errors = $rule->{errors} || {};
1270
1271     my $error_count = 0;
1272
1273     my $add_error = sub {
1274         my ($param, $msg)  = @_;
1275         chomp $msg;
1276         raise_param_exc({ $param => $msg }) if !$noerr;
1277         $error_count++;
1278         $errors->{$param} = $msg if !$errors->{$param};
1279     };
1280
1281     my $ipversion;
1282     my $set_ip_version = sub {
1283         my $vers = shift;
1284         if ($vers) {
1285             die "detected mixed ipv4/ipv6 adresses in rule\n"
1286                 if $ipversion && ($vers != $ipversion);
1287             $ipversion = $vers;
1288         }
1289     };
1290
1291     my $check_ipset_or_alias_property = sub {
1292         my ($name, $expected_ipversion) = @_;
1293
1294         if (my $value = $rule->{$name}) {
1295             if ($value =~ m/^\+/) {
1296                 if ($value =~ m/^\+(${ipset_name_pattern})$/) {
1297                     &$add_error($name, "no such ipset '$1'")
1298                         if !($cluster_conf->{ipset}->{$1} || ($fw_conf && $fw_conf->{ipset}->{$1}));
1299
1300                 } else {
1301                     &$add_error($name, "invalid ipset name '$value'");
1302                 }
1303             } elsif ($value =~ m/^${ip_alias_pattern}$/){
1304                 my $alias = lc($value);
1305                 &$add_error($name, "no such alias '$value'")
1306                     if !($cluster_conf->{aliases}->{$alias} || ($fw_conf && $fw_conf->{aliases}->{$alias}));
1307                 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1308                 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1309
1310                 &$set_ip_version($e->{ipversion});
1311             }
1312         }
1313     };
1314
1315     my $type = $rule->{type};
1316     my $action = $rule->{action};
1317
1318     &$add_error('type', "missing property") if !$type;
1319     &$add_error('action', "missing property") if !$action;
1320
1321     if ($type) {
1322         if ($type eq  'in' || $type eq 'out') {
1323             &$add_error('action', "unknown action '$action'")
1324                 if $action && ($action !~ m/^(ACCEPT|DROP|REJECT)$/);
1325         } elsif ($type eq 'group') {
1326             &$add_error('type', "security groups not allowed")
1327                 if !$allow_groups;
1328             &$add_error('action', "invalid characters in security group name")
1329                 if $action && ($action !~ m/^${security_group_name_pattern}$/);
1330         } else {
1331             &$add_error('type', "unknown rule type '$type'");
1332         }
1333     }
1334
1335     if ($rule->{iface}) {
1336         &$add_error('type', "parameter -i not allowed for this rule type")
1337             if !$allow_iface;
1338         eval { PVE::JSONSchema::pve_verify_iface($rule->{iface}); };
1339         &$add_error('iface', $@) if $@;
1340         if ($rule_env eq 'vm' || $rule_env eq 'ct') {
1341             &$add_error('iface', "value does not match the regex pattern 'net\\d+'")
1342                 if $rule->{iface} !~  m/^net(\d+)$/;
1343         }
1344     }
1345
1346     if ($rule->{macro}) {
1347         if (my $preferred_name = $pve_fw_preferred_macro_names->{lc($rule->{macro})}) {
1348             $rule->{macro} = $preferred_name;
1349         } else {
1350             &$add_error('macro', "unknown macro '$rule->{macro}'");
1351         }
1352     }
1353
1354     if ($rule->{proto}) {
1355         eval { pve_fw_verify_protocol_spec($rule->{proto}); };
1356         &$add_error('proto', $@) if $@;
1357         &$set_ip_version(4) if $rule->{proto} eq 'icmp';
1358         &$set_ip_version(6) if $rule->{proto} eq 'icmpv6';
1359     }
1360
1361     if ($rule->{dport}) {
1362         eval { parse_port_name_number_or_range($rule->{dport}); };
1363         &$add_error('dport', $@) if $@;
1364         &$add_error('proto', "missing property - 'dport' requires this property")
1365             if !$rule->{proto};
1366     }
1367
1368     if ($rule->{sport}) {
1369         eval { parse_port_name_number_or_range($rule->{sport}); };
1370         &$add_error('sport', $@) if $@;
1371         &$add_error('proto', "missing property - 'sport' requires this property")
1372             if !$rule->{proto};
1373     }
1374
1375     if ($rule->{source}) {
1376         eval {
1377             my $source_ipversion = parse_address_list($rule->{source});
1378             &$set_ip_version($source_ipversion);
1379         };
1380         &$add_error('source', $@) if $@;
1381         &$check_ipset_or_alias_property('source', $ipversion);
1382     }
1383
1384     if ($rule->{dest}) {
1385         eval {
1386             my $dest_ipversion = parse_address_list($rule->{dest});
1387             &$set_ip_version($dest_ipversion);
1388         };
1389         &$add_error('dest', $@) if $@;
1390         &$check_ipset_or_alias_property('dest', $ipversion);
1391     }
1392
1393     $rule->{ipversion} = $ipversion if $ipversion;
1394
1395     if ($rule->{macro} && !$error_count) {
1396         eval { &$apply_macro($rule->{macro}, $rule, 1, $ipversion); };
1397         if (my $err = $@) {
1398             if (ref($err) eq "PVE::Exception" && $err->{errors}) {
1399                 my $eh = $err->{errors};
1400                 foreach my $p (keys %$eh) {
1401                     &$add_error($p, $eh->{$p});
1402                 }
1403             } else {
1404                 &$add_error('macro', "$err");
1405             }
1406         }
1407     }
1408
1409     $rule->{errors} = $errors if $error_count;
1410
1411     return $rule;
1412 }
1413
1414 sub copy_rule_data {
1415     my ($rule, $param) = @_;
1416
1417     foreach my $k (keys %$rule_properties) {
1418         if (defined(my $v = $param->{$k})) {
1419             if ($v eq '' || $v eq '-') {
1420                 delete $rule->{$k};
1421             } else {
1422                 $rule->{$k} = $v;
1423             }
1424         }
1425     }
1426
1427     return $rule;
1428 }
1429
1430 sub rules_modify_permissions {
1431     my ($rule_env) = @_;
1432
1433     if ($rule_env eq 'host') {
1434         return {
1435             check => ['perm', '/nodes/{node}', [ 'Sys.Modify' ]],
1436         };
1437     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1438         return {
1439             check => ['perm', '/', [ 'Sys.Modify' ]],
1440         };
1441     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1442         return {
1443             check => ['perm', '/vms/{vmid}', [ 'VM.Config.Network' ]],
1444         }
1445     }
1446
1447     return undef;
1448 }
1449
1450 sub rules_audit_permissions {
1451     my ($rule_env) = @_;
1452
1453     if ($rule_env eq 'host') {
1454         return {
1455             check => ['perm', '/nodes/{node}', [ 'Sys.Audit' ]],
1456         };
1457     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1458         return {
1459             check => ['perm', '/', [ 'Sys.Audit' ]],
1460         };
1461     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1462         return {
1463             check => ['perm', '/vms/{vmid}', [ 'VM.Audit' ]],
1464         }
1465     }
1466
1467     return undef;
1468 }
1469
1470 # core functions
1471 my $bridge_firewall_enabled = 0;
1472
1473 sub enable_bridge_firewall {
1474
1475     return if $bridge_firewall_enabled; # only once
1476
1477     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
1478     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
1479
1480     # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
1481     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
1482
1483     $bridge_firewall_enabled = 1;
1484 }
1485
1486 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
1487
1488 sub iptables_restore_cmdlist {
1489     my ($cmdlist) = @_;
1490
1491     run_command("/sbin/iptables-restore -n", input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1492 }
1493
1494 sub ip6tables_restore_cmdlist {
1495     my ($cmdlist) = @_;
1496
1497     run_command("/sbin/ip6tables-restore -n", input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1498 }
1499
1500 sub ipset_restore_cmdlist {
1501     my ($cmdlist) = @_;
1502
1503     run_command("/sbin/ipset restore", input => $cmdlist, errmsg => "ipset_restore_cmdlist");
1504 }
1505
1506 sub iptables_get_chains {
1507     my ($iptablescmd) = @_;
1508
1509     $iptablescmd = "iptables" if !$iptablescmd;
1510
1511     my $res = {};
1512
1513     # check what chains we want to track
1514     my $is_pvefw_chain = sub {
1515         my $name = shift;
1516
1517         return 1 if $name =~ m/^PVEFW-\S+$/;
1518
1519         return 1 if $name =~ m/^tap\d+i\d+-(?:IN|OUT)$/;
1520
1521         return 1 if $name =~ m/^veth\d+i\d+-(?:IN|OUT)$/;
1522
1523         return 1 if $name =~ m/^fwbr\d+(v\d+)?-(?:FW|IN|OUT|IPS)$/;
1524         return 1 if $name =~ m/^GROUP-(?:$security_group_name_pattern)-(?:IN|OUT)$/;
1525
1526         return undef;
1527     };
1528
1529     my $table = '';
1530
1531     my $hooks = {};
1532
1533     my $parser = sub {
1534         my $line = shift;
1535
1536         return if $line =~ m/^#/;
1537         return if $line =~ m/^\s*$/;
1538
1539         if ($line =~ m/^\*(\S+)$/) {
1540             $table = $1;
1541             return;
1542         }
1543
1544         return if $table ne 'filter';
1545
1546         if ($line =~ m/^:(\S+)\s/) {
1547             my $chain = $1;
1548             return if !&$is_pvefw_chain($chain);
1549             $res->{$chain} = "unknown";
1550         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
1551             my ($chain, $sig) = ($1, $2);
1552             return if !&$is_pvefw_chain($chain);
1553             $res->{$chain} = $sig;
1554         } elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD)\s+-j\s+PVEFW-\1$/) {
1555             $hooks->{$1} = 1;
1556         } else {
1557             # simply ignore the rest
1558             return;
1559         }
1560     };
1561
1562     run_command("/sbin/$iptablescmd-save", outfunc => $parser);
1563
1564     return wantarray ? ($res, $hooks) : $res;
1565 }
1566
1567 sub iptables_chain_digest {
1568     my ($rules) = @_;
1569     my $digest = Digest::SHA->new('sha1');
1570     foreach my $rule (@$rules) { # order is important
1571         $digest->add($rule);
1572     }
1573     return $digest->b64digest;
1574 }
1575
1576 sub ipset_chain_digest {
1577     my ($rules) = @_;
1578
1579     my $digest = Digest::SHA->new('sha1');
1580     foreach my $rule (sort @$rules) { # note: sorted
1581         $digest->add($rule);
1582     }
1583     return $digest->b64digest;
1584 }
1585
1586 sub ipset_get_chains {
1587
1588     my $res = {};
1589     my $chains = {};
1590
1591     my $parser = sub {
1592         my $line = shift;
1593
1594         return if $line =~ m/^#/;
1595         return if $line =~ m/^\s*$/;
1596         if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
1597             my $chain = $1;
1598             $line =~ s/\s+$//; # delete trailing white space
1599             push @{$chains->{$chain}}, $line;
1600         } else {
1601             # simply ignore the rest
1602             return;
1603         }
1604     };
1605
1606     run_command("/sbin/ipset save", outfunc => $parser);
1607
1608     # compute digest for each chain
1609     foreach my $chain (keys %$chains) {
1610         $res->{$chain} = ipset_chain_digest($chains->{$chain});
1611     }
1612
1613     return $res;
1614 }
1615
1616 sub ruleset_generate_cmdstr {
1617     my ($ruleset, $chain, $ipversion, $rule, $actions, $goto, $cluster_conf, $fw_conf) = @_;
1618
1619     return if defined($rule->{enable}) && !$rule->{enable};
1620     return if $rule->{errors};
1621
1622     die "unable to emit macro - internal error" if $rule->{macro}; # should not happen
1623
1624     my $nbdport = defined($rule->{dport}) ? parse_port_name_number_or_range($rule->{dport}) : 0;
1625     my $nbsport = defined($rule->{sport}) ? parse_port_name_number_or_range($rule->{sport}) : 0;
1626
1627     my @cmd = ();
1628
1629     push @cmd, "-i $rule->{iface_in}" if $rule->{iface_in};
1630     push @cmd, "-o $rule->{iface_out}" if $rule->{iface_out};
1631
1632     my $source = $rule->{source};
1633     my $dest = $rule->{dest};
1634
1635     if ($source) {
1636         if ($source =~ m/^\+/) {
1637             if ($source =~ m/^\+(${ipset_name_pattern})$/) {
1638                 my $name = $1;
1639                 if ($fw_conf && $fw_conf->{ipset}->{$name}) {
1640                     my $ipset_chain = compute_ipset_chain_name($fw_conf->{vmid}, $name, $ipversion);
1641                     push @cmd, "-m set --match-set ${ipset_chain} src";
1642                 } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
1643                     my $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
1644                     push @cmd, "-m set --match-set ${ipset_chain} src";
1645                 } else {
1646                     die "no such ipset '$name'\n";
1647                 }
1648             } else {
1649                 die "invalid security group name '$source'\n";
1650             }
1651         } elsif ($source =~ m/^${ip_alias_pattern}$/){
1652             my $alias = lc($source);
1653             my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1654             $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1655             die "no such alias '$source'\n" if !$e;
1656             push @cmd, "-s $e->{cidr}";
1657         } elsif ($source =~ m/\-/){
1658             push @cmd, "-m iprange --src-range $source";
1659         } else {
1660             push @cmd, "-s $source";
1661         }
1662     }
1663
1664     if ($dest) {
1665         if ($dest =~ m/^\+/) {
1666             if ($dest =~ m/^\+(${ipset_name_pattern})$/) {
1667                 my $name = $1;
1668                 if ($fw_conf && $fw_conf->{ipset}->{$name}) {
1669                     my $ipset_chain = compute_ipset_chain_name($fw_conf->{vmid}, $name, $ipversion);
1670                     push @cmd, "-m set --match-set ${ipset_chain} dst";
1671                 } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
1672                     my $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
1673                     push @cmd, "-m set --match-set ${ipset_chain} dst";
1674                 } else {
1675                     die "no such ipset '$name'\n";
1676                 }
1677             } else {
1678                 die "invalid security group name '$dest'\n";
1679             }
1680         } elsif ($dest =~ m/^${ip_alias_pattern}$/){
1681             my $alias = lc($dest);
1682             my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1683             $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1684             die "no such alias '$dest'\n" if !$e;
1685             push @cmd, "-d $e->{cidr}";
1686         } elsif ($dest =~ m/^(\d+)\.(\d+).(\d+).(\d+)\-(\d+)\.(\d+).(\d+).(\d+)$/){
1687             push @cmd, "-m iprange --dst-range $dest";
1688         } else {
1689             push @cmd, "-d $dest";
1690         }
1691     }
1692
1693     if ($rule->{proto}) {
1694         push @cmd, "-p $rule->{proto}";
1695
1696         my $multiport = 0;
1697         $multiport++ if $nbdport > 1;
1698         $multiport++ if $nbsport > 1;
1699
1700         push @cmd, "--match multiport" if $multiport;
1701
1702         die "multiport: option '--sports' cannot be used together with '--dports'\n"
1703             if ($multiport == 2) && ($rule->{dport} ne $rule->{sport});
1704
1705         if ($rule->{dport}) {
1706             if ($rule->{proto} && $rule->{proto} eq 'icmp') {
1707                 # Note: we use dport to store --icmp-type
1708                 die "unknown icmp-type '$rule->{dport}'\n"
1709                     if $rule->{dport} !~ /^\d+$/ && !defined($icmp_type_names->{$rule->{dport}});
1710                 push @cmd, "-m icmp --icmp-type $rule->{dport}";
1711             } elsif ($rule->{proto} && $rule->{proto} eq 'icmpv6') {
1712                 # Note: we use dport to store --icmpv6-type
1713                 die "unknown icmpv6-type '$rule->{dport}'\n"
1714                     if $rule->{dport} !~ /^\d+$/ && !defined($icmpv6_type_names->{$rule->{dport}});
1715                 push @cmd, "-m icmpv6 --icmpv6-type $rule->{dport}";
1716             } else {
1717                 if ($nbdport > 1) {
1718                     if ($multiport == 2) {
1719                         push @cmd,  "--ports $rule->{dport}";
1720                     } else {
1721                         push @cmd, "--dports $rule->{dport}";
1722                     }
1723                 } else {
1724                     push @cmd, "--dport $rule->{dport}";
1725                 }
1726             }
1727         }
1728
1729         if ($rule->{sport}) {
1730             if ($nbsport > 1) {
1731                 push @cmd, "--sports $rule->{sport}" if $multiport != 2;
1732             } else {
1733                 push @cmd, "--sport $rule->{sport}";
1734             }
1735         }
1736     } elsif ($rule->{dport} || $rule->{sport}) {
1737         die "destination port '$rule->{dport}', but no protocol specified\n" if $rule->{dport};
1738         die "source port '$rule->{sport}', but no protocol specified\n" if $rule->{sport};
1739     }
1740
1741     push @cmd, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
1742
1743     if (my $action = $rule->{action}) {
1744         $action = $actions->{$action} if defined($actions->{$action});
1745         $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
1746         push @cmd, $goto ? "-g $action" : "-j $action";
1747     }
1748
1749     return scalar(@cmd) ? join(' ', @cmd) : undef;
1750 }
1751
1752 sub ruleset_generate_rule {
1753     my ($ruleset, $chain, $ipversion, $rule, $actions, $goto, $cluster_conf, $fw_conf) = @_;
1754
1755     my $rules;
1756
1757     if ($rule->{macro}) {
1758         $rules = &$apply_macro($rule->{macro}, $rule, 0, $ipversion);
1759     } else {
1760         $rules = [ $rule ];
1761     }
1762
1763     # update all or nothing
1764
1765     my @cmds = ();
1766     foreach my $tmp (@$rules) {
1767         if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $ipversion, $tmp, $actions, $goto, $cluster_conf, $fw_conf)) {
1768             push @cmds, $cmdstr;
1769         }
1770     }
1771
1772     foreach my $cmdstr (@cmds) {
1773         ruleset_addrule($ruleset, $chain, $cmdstr);
1774     }
1775 }
1776
1777 sub ruleset_generate_rule_insert {
1778     my ($ruleset, $chain, $ipversion, $rule, $actions, $goto) = @_;
1779
1780     die "implement me" if $rule->{macro}; # not implemented, because not needed so far
1781
1782     if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $ipversion, $rule, $actions, $goto)) {
1783         ruleset_insertrule($ruleset, $chain, $cmdstr);
1784     }
1785 }
1786
1787 sub ruleset_create_chain {
1788     my ($ruleset, $chain) = @_;
1789
1790     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
1791     die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
1792
1793     die "chain '$chain' already exists\n" if $ruleset->{$chain};
1794
1795     $ruleset->{$chain} = [];
1796 }
1797
1798 sub ruleset_chain_exist {
1799     my ($ruleset, $chain) = @_;
1800
1801     return $ruleset->{$chain} ? 1 : undef;
1802 }
1803
1804 sub ruleset_addrule {
1805    my ($ruleset, $chain, $rule) = @_;
1806
1807    die "no such chain '$chain'\n" if !$ruleset->{$chain};
1808
1809    push @{$ruleset->{$chain}}, "-A $chain $rule";
1810 }
1811
1812 sub ruleset_insertrule {
1813    my ($ruleset, $chain, $rule) = @_;
1814
1815    die "no such chain '$chain'\n" if !$ruleset->{$chain};
1816
1817    unshift @{$ruleset->{$chain}}, "-A $chain $rule";
1818 }
1819
1820 sub get_log_rule_base {
1821     my ($chain, $vmid, $msg, $loglevel) = @_;
1822
1823     die "internal error - no log level" if !defined($loglevel);
1824
1825     $vmid = 0 if !defined($vmid);
1826
1827     # Note: we use special format for prefix to pass further
1828     # info to log daemon (VMID, LOGVELEL and CHAIN)
1829
1830     return "-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
1831 }
1832
1833 sub ruleset_addlog {
1834     my ($ruleset, $chain, $vmid, $msg, $loglevel, $rule) = @_;
1835
1836     return if !defined($loglevel);
1837
1838     my $logrule = get_log_rule_base($chain, $vmid, $msg, $loglevel);
1839
1840     $logrule = "$rule $logrule" if defined($rule);
1841
1842     ruleset_addrule($ruleset, $chain, $logrule);
1843 }
1844
1845 sub ruleset_add_chain_policy {
1846     my ($ruleset, $chain, $ipversion, $vmid, $policy, $loglevel, $accept_action) = @_;
1847
1848     if ($policy eq 'ACCEPT') {
1849
1850         ruleset_generate_rule($ruleset, $chain, $ipversion, { action => 'ACCEPT' },
1851                               { ACCEPT =>  $accept_action});
1852
1853     } elsif ($policy eq 'DROP') {
1854
1855         ruleset_addrule($ruleset, $chain, "-j PVEFW-Drop");
1856
1857         ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
1858
1859         ruleset_addrule($ruleset, $chain, "-j DROP");
1860     } elsif ($policy eq 'REJECT') {
1861         ruleset_addrule($ruleset, $chain, "-j PVEFW-Reject");
1862
1863         ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
1864
1865         ruleset_addrule($ruleset, $chain, "-g PVEFW-reject");
1866     } else {
1867         # should not happen
1868         die "internal error: unknown policy '$policy'";
1869     }
1870 }
1871
1872 sub ruleset_chain_add_conn_filters {
1873     my ($ruleset, $chain, $accept) = @_;
1874
1875     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1876     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j $accept");
1877 }
1878
1879 sub ruleset_chain_add_input_filters {
1880     my ($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel) = @_;
1881
1882     if ($cluster_conf->{ipset}->{blacklist}){
1883         if (!ruleset_chain_exist($ruleset, "PVEFW-blacklist")) {
1884             ruleset_create_chain($ruleset, "PVEFW-blacklist");
1885             ruleset_addlog($ruleset, "PVEFW-blacklist", 0, "DROP: ", $loglevel) if $loglevel;
1886             ruleset_addrule($ruleset, "PVEFW-blacklist", "-j DROP");
1887         }
1888         my $ipset_chain = compute_ipset_chain_name(0, 'blacklist', $ipversion);
1889         ruleset_addrule($ruleset, $chain, "-m set --match-set ${ipset_chain} src -j PVEFW-blacklist");
1890     }
1891
1892     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
1893         if ($ipversion == 4) {
1894             ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
1895         }
1896     }
1897
1898     if ($options->{tcpflags}) {
1899         ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
1900     }
1901 }
1902
1903 sub ruleset_create_vm_chain {
1904     my ($ruleset, $chain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction) = @_;
1905
1906     ruleset_create_chain($ruleset, $chain);
1907     my $accept = generate_nfqueue($options);
1908
1909     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
1910         if ($ipversion == 4) {
1911             if ($direction eq 'OUT') {
1912                 ruleset_generate_rule($ruleset, $chain, $ipversion,
1913                                       { action => 'PVEFW-SET-ACCEPT-MARK',
1914                                         proto => 'udp', sport => 68, dport => 67 });
1915             } else {
1916                 ruleset_generate_rule($ruleset, $chain, $ipversion,
1917                                       { action => 'ACCEPT',
1918                                         proto => 'udp', sport => 67, dport => 68 });
1919             }
1920         } elsif ($ipversion == 6) {
1921             if ($direction eq 'OUT') {
1922                 ruleset_generate_rule($ruleset, $chain, $ipversion,
1923                                       { action => 'PVEFW-SET-ACCEPT-MARK',
1924                                         proto => 'udp', sport => 546, dport => 547 });
1925             } else {
1926                 ruleset_generate_rule($ruleset, $chain, $ipversion,
1927                                       { action => 'ACCEPT',
1928                                         proto => 'udp', sport => 547, dport => 546 });
1929             }
1930         }
1931
1932     }
1933
1934     if ($direction eq 'OUT') {
1935         if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
1936             ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr -j DROP");
1937         }
1938         if ($ipfilter_ipset) {
1939             ruleset_addrule($ruleset, $chain, "-m set ! --match-set $ipfilter_ipset src -j DROP");
1940         }
1941         ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1942     }
1943 }
1944
1945 sub ruleset_add_group_rule {
1946     my ($ruleset, $cluster_conf, $chain, $rule, $direction, $action, $ipversion) = @_;
1947
1948     my $group = $rule->{action};
1949     my $group_chain = "GROUP-$group-$direction";
1950     if(!ruleset_chain_exist($ruleset, $group_chain)){
1951         generate_group_rules($ruleset, $cluster_conf, $group, $ipversion);
1952     }
1953
1954     if ($direction eq 'OUT' && $rule->{iface_out}) {
1955         ruleset_addrule($ruleset, $chain, "-o $rule->{iface_out} -j $group_chain");
1956     } elsif ($direction eq 'IN' && $rule->{iface_in}) {
1957         ruleset_addrule($ruleset, $chain, "-i $rule->{iface_in} -j $group_chain");
1958     } else {
1959         ruleset_addrule($ruleset, $chain, "-j $group_chain");
1960     }
1961
1962     ruleset_addrule($ruleset, $chain, "-m mark --mark 1 -j $action");
1963 }
1964
1965 sub ruleset_generate_vm_rules {
1966     my ($ruleset, $rules, $cluster_conf, $vmfw_conf, $chain, $netid, $direction, $options, $ipversion) = @_;
1967
1968     my $lc_direction = lc($direction);
1969
1970     my $in_accept = generate_nfqueue($options);
1971
1972     foreach my $rule (@$rules) {
1973         next if $rule->{iface} && $rule->{iface} ne $netid;
1974         next if !$rule->{enable} || $rule->{errors};
1975         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
1976
1977         if ($rule->{type} eq 'group') {
1978             ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, $direction,
1979                                    $direction eq 'OUT' ? 'RETURN' : $in_accept, $ipversion);
1980         } else {
1981             next if $rule->{type} ne $lc_direction;
1982             eval {
1983                 if ($direction eq 'OUT') {
1984                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
1985                                           { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" },
1986                                           undef, $cluster_conf, $vmfw_conf);
1987                 } else {
1988                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
1989                                           { ACCEPT => $in_accept , REJECT => "PVEFW-reject" },
1990                                           undef, $cluster_conf, $vmfw_conf);
1991                 }
1992             };
1993             warn $@ if $@;
1994         }
1995     }
1996 }
1997
1998 sub generate_nfqueue {
1999     my ($options) = @_;
2000
2001     if ($options->{ips}) {
2002         my $action = "NFQUEUE";
2003         if ($options->{ips_queues} && $options->{ips_queues} =~ m/^(\d+)(:(\d+))?$/) {
2004             if (defined($3) && defined($1)) {
2005                 $action .= " --queue-balance $1:$3";
2006             } elsif (defined($1)) {
2007                 $action .= " --queue-num $1";
2008             }
2009         }
2010         $action .= " --queue-bypass" if $feature_ipset_nomatch; #need kernel 3.10
2011         return $action;
2012     } else {
2013         return "ACCEPT";
2014     }
2015 }
2016
2017 sub ruleset_generate_vm_ipsrules {
2018     my ($ruleset, $options, $direction, $iface) = @_;
2019
2020     if ($options->{ips} && $direction eq 'IN') {
2021         my $nfqueue = generate_nfqueue($options);
2022
2023         if (!ruleset_chain_exist($ruleset, "PVEFW-IPS")) {
2024             ruleset_create_chain($ruleset, "PVEFW-IPS");
2025         }
2026
2027         ruleset_addrule($ruleset, "PVEFW-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged -j $nfqueue");
2028     }
2029 }
2030
2031 sub generate_tap_rules_direction {
2032     my ($ruleset, $cluster_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $direction, $ipversion) = @_;
2033
2034     my $lc_direction = lc($direction);
2035
2036     my $rules = $vmfw_conf->{rules};
2037
2038     my $options = $vmfw_conf->{options};
2039     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
2040
2041     my $tapchain = "$iface-$direction";
2042
2043     my $ipfilter_name = compute_ipfilter_ipset_name($netid);
2044     my $ipfilter_ipset = compute_ipset_chain_name($vmid, $ipfilter_name, $ipversion)
2045         if $vmfw_conf->{ipset}->{$ipfilter_name};
2046
2047     # create chain with mac and ip filter
2048     ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
2049
2050     if ($options->{enable}) {
2051         ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $tapchain, $netid, $direction, $options, $ipversion);
2052
2053         ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface);
2054
2055         # implement policy
2056         my $policy;
2057
2058         if ($direction eq 'OUT') {
2059             $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
2060         } else {
2061         $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
2062         }
2063
2064         my $accept = generate_nfqueue($options);
2065         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
2066         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, $policy, $loglevel, $accept_action);
2067     } else {
2068         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : 'ACCEPT';
2069         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, 'ACCEPT', $loglevel, $accept_action);
2070     }
2071
2072     # plug the tap chain to bridge chain
2073     if ($direction eq 'IN') {
2074         ruleset_addrule($ruleset, "PVEFW-FWBR-IN",
2075                         "-m physdev --physdev-is-bridged --physdev-out $iface -j $tapchain");
2076     } else {
2077         ruleset_addrule($ruleset, "PVEFW-FWBR-OUT",
2078                         "-m physdev --physdev-is-bridged --physdev-in $iface -j $tapchain");
2079     }
2080 }
2081
2082 sub enable_host_firewall {
2083     my ($ruleset, $hostfw_conf, $cluster_conf, $ipversion) = @_;
2084
2085     my $options = $hostfw_conf->{options};
2086     my $cluster_options = $cluster_conf->{options};
2087     my $rules = $hostfw_conf->{rules};
2088     my $cluster_rules = $cluster_conf->{rules};
2089
2090     # host inbound firewall
2091     my $chain = "PVEFW-HOST-IN";
2092     ruleset_create_chain($ruleset, $chain);
2093
2094     my $loglevel = get_option_log_level($options, "log_level_in");
2095
2096     ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
2097
2098     ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
2099     ruleset_chain_add_input_filters($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel);
2100
2101     # we use RETURN because we need to check also tap rules
2102     my $accept_action = 'RETURN';
2103
2104     ruleset_addrule($ruleset, $chain, "-p igmp -j $accept_action"); # important for multicast
2105
2106     # add host rules first, so that cluster wide rules can be overwritten
2107     foreach my $rule (@$rules, @$cluster_rules) {
2108         next if !$rule->{enable} || $rule->{errors};
2109         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2110
2111         $rule->{iface_in} = $rule->{iface} if $rule->{iface};
2112
2113         eval {
2114             if ($rule->{type} eq 'group') {
2115                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'IN', $accept_action, $ipversion);
2116             } elsif ($rule->{type} eq 'in') {
2117                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
2118                                       { ACCEPT => $accept_action, REJECT => "PVEFW-reject" },
2119                                       undef, $cluster_conf, $hostfw_conf);
2120             }
2121         };
2122         warn $@ if $@;
2123         delete $rule->{iface_in};
2124     }
2125
2126     # allow standard traffic for management ipset (includes cluster network)
2127     my $mngmnt_ipset_chain = compute_ipset_chain_name(0, "management", $ipversion);
2128     my $mngmntsrc = "-m set --match-set ${mngmnt_ipset_chain} src";
2129     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 8006 -j $accept_action");  # PVE API
2130     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 5900:5999 -j $accept_action");  # PVE VNC Console
2131     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 3128 -j $accept_action");  # SPICE Proxy
2132     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 22 -j $accept_action");  # SSH
2133
2134     my $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
2135     my $localnet_ver = $cluster_conf->{aliases}->{local_network}->{ipversion};
2136
2137     # corosync
2138     if ($localnet && ($ipversion == $localnet_ver)) {
2139         my $corosync_rule = "-p udp --dport 5404:5405 -j $accept_action";
2140         ruleset_addrule($ruleset, $chain, "-s $localnet -d $localnet $corosync_rule");
2141         ruleset_addrule($ruleset, $chain, "-s $localnet -m addrtype --dst-type MULTICAST $corosync_rule");
2142     }
2143
2144     # implement input policy
2145     my $policy = $cluster_options->{policy_in} || 'DROP'; # allow nothing by default
2146     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2147
2148     # host outbound firewall
2149     $chain = "PVEFW-HOST-OUT";
2150     ruleset_create_chain($ruleset, $chain);
2151
2152     $loglevel = get_option_log_level($options, "log_level_out");
2153
2154     ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
2155
2156     ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
2157
2158     # we use RETURN because we may want to check other thigs later
2159     $accept_action = 'RETURN';
2160
2161     ruleset_addrule($ruleset, $chain, "-p igmp -j $accept_action"); # important for multicast
2162
2163     # add host rules first, so that cluster wide rules can be overwritten
2164     foreach my $rule (@$rules, @$cluster_rules) {
2165         next if !$rule->{enable} || $rule->{errors};
2166         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2167
2168         $rule->{iface_out} = $rule->{iface} if $rule->{iface};
2169         eval {
2170             if ($rule->{type} eq 'group') {
2171                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'OUT', $accept_action, $ipversion);
2172             } elsif ($rule->{type} eq 'out') {
2173                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2174                                       $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" },
2175                                       undef, $cluster_conf, $hostfw_conf);
2176             }
2177         };
2178         warn $@ if $@;
2179         delete $rule->{iface_out};
2180     }
2181
2182     # allow standard traffic on cluster network
2183     if ($localnet && ($ipversion == $localnet_ver)) {
2184         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 8006 -j $accept_action");  # PVE API
2185         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 22 -j $accept_action");  # SSH
2186         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 5900:5999 -j $accept_action");  # PVE VNC Console
2187         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 3128 -j $accept_action");  # SPICE Proxy
2188
2189         my $corosync_rule = "-p udp --dport 5404:5405 -j $accept_action";
2190         ruleset_addrule($ruleset, $chain, "-d $localnet $corosync_rule");
2191         ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule");
2192     }
2193
2194     # implement output policy
2195     $policy = $cluster_options->{policy_out} || 'ACCEPT'; # allow everything by default
2196     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2197
2198     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
2199     ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
2200 }
2201
2202 sub generate_group_rules {
2203     my ($ruleset, $cluster_conf, $group, $ipversion) = @_;
2204
2205     my $rules = $cluster_conf->{groups}->{$group};
2206
2207     if (!$rules) {
2208         warn "no such security group '$group'\n";
2209         $rules = []; # create empty chain
2210     }
2211
2212     my $chain = "GROUP-${group}-IN";
2213
2214     ruleset_create_chain($ruleset, $chain);
2215     ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
2216
2217     foreach my $rule (@$rules) {
2218         next if $rule->{type} ne 'in';
2219         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2220         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
2221                               { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" },
2222                               undef, $cluster_conf);
2223     }
2224
2225     $chain = "GROUP-${group}-OUT";
2226
2227     ruleset_create_chain($ruleset, $chain);
2228     ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
2229
2230     foreach my $rule (@$rules) {
2231         next if $rule->{type} ne 'out';
2232         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2233         # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
2234         # check also other tap rules later
2235         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule,
2236                               { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" },
2237                               undef, $cluster_conf);
2238     }
2239 }
2240
2241 my $MAX_NETS = 32;
2242 my $valid_netdev_names = {};
2243 for (my $i = 0; $i < $MAX_NETS; $i++)  {
2244     $valid_netdev_names->{"net$i"} = 1;
2245 }
2246
2247 sub parse_fw_rule {
2248     my ($prefix, $line, $cluster_conf, $fw_conf, $rule_env, $verbose) = @_;
2249
2250     my $orig_line = $line;
2251
2252     my $rule = {};
2253
2254     # we can add single line comments to the end of the rule
2255     if ($line =~ s/#\s*(.*?)\s*$//) {
2256         $rule->{comment} = decode('utf8', $1);
2257     }
2258
2259     # we can disable a rule when prefixed with '|'
2260
2261     $rule->{enable} = $line =~ s/^\|// ? 0 : 1;
2262
2263     $line =~ s/^(\S+)\s+(\S+)\s*// ||
2264         die "unable to parse rule: $line\n";
2265
2266     $rule->{type} = lc($1);
2267     $rule->{action} = $2;
2268
2269     if ($rule->{type} eq  'in' || $rule->{type} eq 'out') {
2270         if ($rule->{action} =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
2271             $rule->{macro} = $1;
2272             $rule->{action} = $2;
2273         }
2274     }
2275
2276     while (length($line)) {
2277         if ($line =~ s/^-i (\S+)\s*//) {
2278             $rule->{iface} = $1;
2279             next;
2280         }
2281
2282         last if $rule->{type} eq 'group';
2283
2284         if ($line =~ s/^-p (\S+)\s*//) {
2285             $rule->{proto} = $1;
2286             next;
2287         }
2288
2289         if ($line =~ s/^-dport (\S+)\s*//) {
2290             $rule->{dport} = $1;
2291             next;
2292         }
2293
2294         if ($line =~ s/^-sport (\S+)\s*//) {
2295             $rule->{sport} = $1;
2296             next;
2297         }
2298         if ($line =~ s/^-source (\S+)\s*//) {
2299             $rule->{source} = $1;
2300             next;
2301         }
2302         if ($line =~ s/^-dest (\S+)\s*//) {
2303             $rule->{dest} = $1;
2304             next;
2305         }
2306
2307         last;
2308     }
2309
2310     die "unable to parse rule parameters: $line\n" if length($line);
2311
2312     $rule = verify_rule($rule, $cluster_conf, $fw_conf, $rule_env, 1);
2313     if ($verbose && $rule->{errors}) {
2314         warn "$prefix - errors in rule parameters: $orig_line\n";
2315         foreach my $p (keys %{$rule->{errors}}) {
2316             warn "  $p: $rule->{errors}->{$p}\n";
2317         }
2318     }
2319
2320     return $rule;
2321 }
2322
2323 sub parse_vmfw_option {
2324     my ($line) = @_;
2325
2326     my ($opt, $value);
2327
2328     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2329
2330     if ($line =~ m/^(enable|dhcp|macfilter|ips):\s*(0|1)\s*$/i) {
2331         $opt = lc($1);
2332         $value = int($2);
2333     } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
2334         $opt = lc($1);
2335         $value = $2 ? lc($3) : '';
2336     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2337         $opt = lc($1);
2338         $value = uc($3);
2339     } elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
2340         $opt = lc($1);
2341         $value = $2;
2342     } else {
2343         die "can't parse option '$line'\n"
2344     }
2345
2346     return ($opt, $value);
2347 }
2348
2349 sub parse_hostfw_option {
2350     my ($line) = @_;
2351
2352     my ($opt, $value);
2353
2354     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2355
2356     if ($line =~ m/^(enable|nosmurfs|tcpflags):\s*(0|1)\s*$/i) {
2357         $opt = lc($1);
2358         $value = int($2);
2359     } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
2360         $opt = lc($1);
2361         $value = $2 ? lc($3) : '';
2362     } elsif ($line =~ m/^(nf_conntrack_max|nf_conntrack_tcp_timeout_established):\s*(\d+)\s*$/i) {
2363         $opt = lc($1);
2364         $value = int($2);
2365     } else {
2366         die "can't parse option '$line'\n"
2367     }
2368
2369     return ($opt, $value);
2370 }
2371
2372 sub parse_clusterfw_option {
2373     my ($line) = @_;
2374
2375     my ($opt, $value);
2376
2377     if ($line =~ m/^(enable):\s*(\d+)\s*$/i) {
2378         $opt = lc($1);
2379         $value = int($2);
2380         if (($value > 1) && ((time() - $value) > 60)) {
2381             $value = 0
2382         }
2383     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2384         $opt = lc($1);
2385         $value = uc($3);
2386     } else {
2387         die "can't parse option '$line'\n"
2388     }
2389
2390     return ($opt, $value);
2391 }
2392
2393 sub resolve_alias {
2394     my ($clusterfw_conf, $fw_conf, $cidr) = @_;
2395
2396     my $alias = lc($cidr);
2397     my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2398     $e = $clusterfw_conf->{aliases}->{$alias} if !$e && $clusterfw_conf;
2399
2400     die "no such alias '$cidr'\n" if !$e;;
2401
2402     return wantarray ? ($e->{cidr}, $e->{ipversion}) : $e->{cidr};
2403 }
2404
2405 sub parse_ip_or_cidr {
2406     my ($cidr) = @_;
2407
2408     my $ipversion;
2409
2410     if ($cidr =~ m!^(?:$IPV6RE)(/(\d+))?$!) {
2411         $cidr =~ s|/128$||;
2412         $ipversion = 6;
2413     } elsif ($cidr =~ m!^(?:$IPV4RE)(/(\d+))?$!) {
2414         $cidr =~ s|/32$||;
2415         $ipversion = 4;
2416     } else {
2417         die "value does not look like a valid IP address or CIDR network\n";
2418     }
2419
2420     return wantarray ? ($cidr, $ipversion) : $cidr;
2421 }
2422
2423 sub parse_alias {
2424     my ($line) = @_;
2425
2426     # we can add single line comments to the end of the line
2427     my $comment = decode('utf8', $1) if $line =~ s/\s*#\s*(.*?)\s*$//;
2428
2429     if ($line =~ m/^(\S+)\s(\S+)$/) {
2430         my ($name, $cidr) = ($1, $2);
2431         my $ipversion;
2432
2433         ($cidr, $ipversion) = parse_ip_or_cidr($cidr);
2434
2435         my $data = {
2436             name => $name,
2437             cidr => $cidr,
2438             ipversion => $ipversion,
2439         };
2440         $data->{comment} = $comment  if $comment;
2441         return $data;
2442     }
2443
2444     return undef;
2445 }
2446
2447 sub generic_fw_config_parser {
2448     my ($filename, $fh, $verbose, $cluster_conf, $empty_conf, $rule_env) = @_;
2449
2450     my $section;
2451     my $group;
2452
2453     my $res = $empty_conf;
2454
2455     while (defined(my $line = <$fh>)) {
2456         next if $line =~ m/^#/;
2457         next if $line =~ m/^\s*$/;
2458
2459         chomp $line;
2460
2461         my $linenr = $fh->input_line_number();
2462         my $prefix = "$filename (line $linenr)";
2463
2464         if ($empty_conf->{options} && ($line =~ m/^\[options\]$/i)) {
2465             $section = 'options';
2466             next;
2467         }
2468
2469         if ($empty_conf->{aliases} && ($line =~ m/^\[aliases\]$/i)) {
2470             $section = 'aliases';
2471             next;
2472         }
2473
2474         if ($empty_conf->{groups} && ($line =~ m/^\[group\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2475             $section = 'groups';
2476             $group = lc($1);
2477             my $comment = $2;
2478             eval {
2479                 die "security group name too long\n" if length($group) > $max_group_name_length;
2480                 die "invalid security group name '$group'\n" if $group !~ m/^${security_group_name_pattern}$/;
2481             };
2482             if (my $err = $@) {
2483                 ($section, $group, $comment) = undef;
2484                 warn "$prefix: $err";
2485                 next;
2486             }
2487
2488             $res->{$section}->{$group} = [];
2489             $res->{group_comments}->{$group} =  decode('utf8', $comment)
2490                 if $comment;
2491             next;
2492         }
2493
2494         if ($empty_conf->{rules} && ($line =~ m/^\[rules\]$/i)) {
2495             $section = 'rules';
2496             next;
2497         }
2498
2499         if ($empty_conf->{ipset} && ($line =~ m/^\[ipset\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2500             $section = 'ipset';
2501             $group = lc($1);
2502             my $comment = $2;
2503             eval {
2504                 die "ipset name too long\n" if length($group) > $max_ipset_name_length;
2505                 die "invalid ipset name '$group'\n" if $group !~ m/^${ipset_name_pattern}$/;
2506             };
2507             if (my $err = $@) {
2508                 ($section, $group, $comment) = undef;
2509                 warn "$prefix: $err";
2510                 next;
2511             }
2512
2513             $res->{$section}->{$group} = [];
2514             $res->{ipset_comments}->{$group} = decode('utf8', $comment)
2515                 if $comment;
2516             next;
2517         }
2518
2519         if (!$section) {
2520             warn "$prefix: skip line - no section\n";
2521             next;
2522         }
2523
2524         if ($section eq 'options') {
2525             eval {
2526                 my ($opt, $value);
2527                 if ($rule_env eq 'cluster') {
2528                     ($opt, $value) = parse_clusterfw_option($line);
2529                 } elsif ($rule_env eq 'host') {
2530                     ($opt, $value) = parse_hostfw_option($line);
2531                 } else {
2532                     ($opt, $value) = parse_vmfw_option($line);
2533                 }
2534                 $res->{options}->{$opt} = $value;
2535             };
2536             warn "$prefix: $@" if $@;
2537         } elsif ($section eq 'aliases') {
2538             eval {
2539                 my $data = parse_alias($line);
2540                 $res->{aliases}->{lc($data->{name})} = $data;
2541             };
2542             warn "$prefix: $@" if $@;
2543         } elsif ($section eq 'rules') {
2544             my $rule;
2545             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, $res, $rule_env, $verbose); };
2546             if (my $err = $@) {
2547                 warn "$prefix: $err";
2548                 next;
2549             }
2550             push @{$res->{$section}}, $rule;
2551         } elsif ($section eq 'groups') {
2552             my $rule;
2553             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, undef, 'group', $verbose); };
2554             if (my $err = $@) {
2555                 warn "$prefix: $err";
2556                 next;
2557             }
2558             push @{$res->{$section}->{$group}}, $rule;
2559         } elsif ($section eq 'ipset') {
2560             # we can add single line comments to the end of the rule
2561             my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
2562
2563             $line =~ m/^(\!)?\s*(\S+)\s*$/;
2564             my $nomatch = $1;
2565             my $cidr = $2;
2566             my $errors;
2567
2568             if ($nomatch && !$feature_ipset_nomatch) {
2569                 $errors->{nomatch} = "nomatch not supported by kernel";
2570             }
2571
2572             eval {
2573                 if ($cidr =~ m/^${ip_alias_pattern}$/) {
2574                     resolve_alias($cluster_conf, $res, $cidr); # make sure alias exists
2575                 } else {
2576                     $cidr = parse_ip_or_cidr($cidr);
2577                 }
2578             };
2579             if (my $err = $@) {
2580                 chomp $err;
2581                 $errors->{cidr} = $err;
2582             }
2583
2584             my $entry = { cidr => $cidr };
2585             $entry->{nomatch} = 1 if $nomatch;
2586             $entry->{comment} = $comment if $comment;
2587             $entry->{errors} =  $errors if $errors;
2588
2589             if ($verbose && $errors) {
2590                 warn "$prefix - errors in ipset '$group': $line\n";
2591                 foreach my $p (keys %{$errors}) {
2592                     warn "  $p: $errors->{$p}\n";
2593                 }
2594             }
2595
2596             push @{$res->{$section}->{$group}}, $entry;
2597         } else {
2598             warn "$prefix: skip line - unknown section\n";
2599             next;
2600         }
2601     }
2602
2603     return $res;
2604 }
2605
2606 sub parse_hostfw_config {
2607     my ($filename, $fh, $cluster_conf, $verbose) = @_;
2608
2609     my $empty_conf = { rules => [], options => {}};
2610
2611     return generic_fw_config_parser($filename, $fh, $verbose, $cluster_conf, $empty_conf, 'host');
2612 }
2613
2614 sub parse_vmfw_config {
2615     my ($filename, $fh, $cluster_conf, $rule_env, $verbose) = @_;
2616
2617     my $empty_conf = {
2618         rules => [],
2619         options => {},
2620         aliases => {},
2621         ipset => {} ,
2622         ipset_comments => {},
2623     };
2624
2625     return generic_fw_config_parser($filename, $fh, $verbose, $cluster_conf, $empty_conf, $rule_env);
2626 }
2627
2628 sub parse_clusterfw_config {
2629     my ($filename, $fh, $verbose) = @_;
2630
2631     my $section;
2632     my $group;
2633
2634     my $empty_conf = {
2635         rules => [],
2636         options => {},
2637         aliases => {},
2638         groups => {},
2639         group_comments => {},
2640         ipset => {} ,
2641         ipset_comments => {},
2642     };
2643
2644     return generic_fw_config_parser($filename, $fh, $verbose, $empty_conf, $empty_conf, 'cluster');
2645 }
2646
2647 sub run_locked {
2648     my ($code, @param) = @_;
2649
2650     my $timeout = 10;
2651
2652     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
2653
2654     die $@ if $@;
2655
2656     return $res;
2657 }
2658
2659 sub read_local_vm_config {
2660
2661     my $qemu = {};
2662     my $lxc = {};
2663
2664     my $vmdata = { qemu => $qemu, lxc => $lxc };
2665
2666     my $vmlist = PVE::Cluster::get_vmlist();
2667     return $vmdata if !$vmlist || !$vmlist->{ids};
2668     my $ids = $vmlist->{ids};
2669
2670     foreach my $vmid (keys %$ids) {
2671         next if !$vmid; # skip VE0
2672         my $d = $ids->{$vmid};
2673         next if !$d->{node} || $d->{node} ne $nodename;
2674         next if !$d->{type};
2675         if ($d->{type} eq 'qemu') {
2676             if ($have_qemu_server) {
2677                 my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
2678                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2679                     $qemu->{$vmid} = $conf;
2680                 }
2681             }
2682         } elsif ($d->{type} eq 'lxc') {
2683             if ($have_lxc) {
2684                 my $cfspath = PVE::LXC::cfs_config_path($vmid);
2685                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2686                     $lxc->{$vmid} = $conf;
2687                 }
2688             }
2689         }
2690     }
2691
2692     return $vmdata;
2693 };
2694
2695 sub load_vmfw_conf {
2696     my ($cluster_conf, $rule_env, $vmid, $dir, $verbose) = @_;
2697
2698     my $vmfw_conf = {};
2699
2700     $dir = $pvefw_conf_dir if !defined($dir);
2701
2702     my $filename = "$dir/$vmid.fw";
2703     if (my $fh = IO::File->new($filename, O_RDONLY)) {
2704         $vmfw_conf = parse_vmfw_config($filename, $fh, $cluster_conf, $rule_env, $verbose);
2705         $vmfw_conf->{vmid} = $vmid;
2706     }
2707
2708     return $vmfw_conf;
2709 }
2710
2711 my $format_rules = sub {
2712     my ($rules, $allow_iface) = @_;
2713
2714     my $raw = '';
2715
2716     foreach my $rule (@$rules) {
2717         if ($rule->{type} eq  'in' || $rule->{type} eq 'out' || $rule->{type} eq 'group') {
2718             $raw .= '|' if defined($rule->{enable}) && !$rule->{enable};
2719             $raw .= uc($rule->{type});
2720             if ($rule->{macro}) {
2721                 $raw .= " $rule->{macro}($rule->{action})";
2722             } else {
2723                 $raw .= " " . $rule->{action};
2724             }
2725             if ($allow_iface && $rule->{iface}) {
2726                 $raw .= " -i $rule->{iface}";
2727             }
2728
2729             if ($rule->{type} ne  'group')  {
2730                 $raw .= " -source $rule->{source}" if $rule->{source};
2731                 $raw .= " -dest $rule->{dest}" if $rule->{dest};
2732                 $raw .= " -p $rule->{proto}" if $rule->{proto};
2733                 $raw .= " -dport $rule->{dport}" if $rule->{dport};
2734                 $raw .= " -sport $rule->{sport}" if $rule->{sport};
2735             }
2736
2737             $raw .= " # " . encode('utf8', $rule->{comment})
2738                 if $rule->{comment} && $rule->{comment} !~ m/^\s*$/;
2739             $raw .= "\n";
2740         } else {
2741             die "unknown rule type '$rule->{type}'";
2742         }
2743     }
2744
2745     return $raw;
2746 };
2747
2748 my $format_options = sub {
2749     my ($options) = @_;
2750
2751     my $raw = '';
2752
2753     $raw .= "[OPTIONS]\n\n";
2754     foreach my $opt (keys %$options) {
2755         $raw .= "$opt: $options->{$opt}\n";
2756     }
2757     $raw .= "\n";
2758
2759     return $raw;
2760 };
2761
2762 my $format_aliases = sub {
2763     my ($aliases) = @_;
2764
2765     my $raw = '';
2766
2767     $raw .= "[ALIASES]\n\n";
2768     foreach my $k (keys %$aliases) {
2769         my $e = $aliases->{$k};
2770         $raw .= "$e->{name} $e->{cidr}";
2771         $raw .= " # " . encode('utf8', $e->{comment})
2772             if $e->{comment} && $e->{comment} !~ m/^\s*$/;
2773         $raw .= "\n";
2774     }
2775     $raw .= "\n";
2776
2777     return $raw;
2778 };
2779
2780 my $format_ipsets = sub {
2781     my ($fw_conf) = @_;
2782
2783     my $raw = '';
2784
2785     foreach my $ipset (sort keys %{$fw_conf->{ipset}}) {
2786         if (my $comment = $fw_conf->{ipset_comments}->{$ipset}) {
2787             my $utf8comment = encode('utf8', $comment);
2788             $raw .= "[IPSET $ipset] # $utf8comment\n\n";
2789         } else {
2790             $raw .= "[IPSET $ipset]\n\n";
2791         }
2792         my $options = $fw_conf->{ipset}->{$ipset};
2793
2794         my $nethash = {};
2795         foreach my $entry (@$options) {
2796             $nethash->{$entry->{cidr}} = $entry;
2797         }
2798
2799         foreach my $cidr (sort keys %$nethash) {
2800             my $entry = $nethash->{$cidr};
2801             my $line = $entry->{nomatch} ? '!' : '';
2802             $line .= $entry->{cidr};
2803             $line .= " # " . encode('utf8', $entry->{comment})
2804                 if $entry->{comment} && $entry->{comment} !~ m/^\s*$/;
2805             $raw .= "$line\n";
2806         }
2807
2808         $raw .= "\n";
2809     }
2810
2811     return $raw;
2812 };
2813
2814 sub save_vmfw_conf {
2815     my ($vmid, $vmfw_conf) = @_;
2816
2817     my $raw = '';
2818
2819     my $options = $vmfw_conf->{options};
2820     $raw .= &$format_options($options) if $options && scalar(keys %$options);
2821
2822     my $aliases = $vmfw_conf->{aliases};
2823     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
2824
2825     $raw .= &$format_ipsets($vmfw_conf) if $vmfw_conf->{ipset};
2826
2827     my $rules = $vmfw_conf->{rules} || [];
2828     if ($rules && scalar(@$rules)) {
2829         $raw .= "[RULES]\n\n";
2830         $raw .= &$format_rules($rules, 1);
2831         $raw .= "\n";
2832     }
2833
2834     my $filename = "$pvefw_conf_dir/$vmid.fw";
2835     if ($raw) {
2836         mkdir $pvefw_conf_dir;
2837         PVE::Tools::file_set_contents($filename, $raw);
2838     } else {
2839         unlink $filename;
2840     }
2841 }
2842
2843 sub remove_vmfw_conf {
2844     my ($vmid) = @_;
2845
2846     my $vmfw_conffile = "$pvefw_conf_dir/$vmid.fw";
2847
2848     unlink $vmfw_conffile;
2849 }
2850
2851 sub clone_vmfw_conf {
2852     my ($vmid, $newid) = @_;
2853
2854     my $sourcevm_conffile = "$pvefw_conf_dir/$vmid.fw";
2855     my $clonevm_conffile = "$pvefw_conf_dir/$newid.fw";
2856
2857     if (-f $clonevm_conffile) {
2858         unlink $clonevm_conffile;
2859     }
2860     if (-f $sourcevm_conffile) {
2861         my $data = PVE::Tools::file_get_contents($sourcevm_conffile);
2862         PVE::Tools::file_set_contents($clonevm_conffile, $data);
2863     }
2864 }
2865
2866 sub read_vm_firewall_configs {
2867     my ($cluster_conf, $vmdata, $dir, $verbose) = @_;
2868
2869     my $vmfw_configs = {};
2870
2871     foreach my $vmid (keys %{$vmdata->{qemu}}) {
2872         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'vm', $vmid, $dir, $verbose);
2873         next if !$vmfw_conf->{options}; # skip if file does not exists
2874         $vmfw_configs->{$vmid} = $vmfw_conf;
2875     }
2876     foreach my $vmid (keys %{$vmdata->{lxc}}) {
2877         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'ct', $vmid, $dir, $verbose);
2878         next if !$vmfw_conf->{options}; # skip if file does not exists
2879         $vmfw_configs->{$vmid} = $vmfw_conf;
2880     }
2881
2882     return $vmfw_configs;
2883 }
2884
2885 sub get_option_log_level {
2886     my ($options, $k) = @_;
2887
2888     my $v = $options->{$k};
2889     $v = $default_log_level if !defined($v);
2890
2891     return undef if $v eq '' || $v eq 'nolog';
2892
2893     $v = $log_level_hash->{$v} if defined($log_level_hash->{$v});
2894
2895     return $v if ($v >= 0) && ($v <= 7);
2896
2897     warn "unknown log level ($k = '$v')\n";
2898
2899     return undef;
2900 }
2901
2902 sub generate_std_chains {
2903     my ($ruleset, $options, $ipversion) = @_;
2904
2905     my $std_chains = $pve_std_chains->{$ipversion} || die "internal error";
2906
2907     my $loglevel = get_option_log_level($options, 'smurf_log_level');
2908
2909     my $chain;
2910
2911     if ($ipversion == 4) {
2912         # same as shorewall smurflog.
2913         $chain = 'PVEFW-smurflog';
2914         $std_chains->{$chain} = [];
2915
2916         push @{$std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
2917         push @{$std_chains->{$chain}}, "-j DROP";
2918     }
2919
2920     # same as shorewall logflags action.
2921     $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
2922     $chain = 'PVEFW-logflags';
2923     $std_chains->{$chain} = [];
2924
2925     # fixme: is this correctly logged by pvewf-logger? (ther is no --log-ip-options for NFLOG)
2926     push @{$std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
2927     push @{$std_chains->{$chain}}, "-j DROP";
2928
2929     foreach my $chain (keys %$std_chains) {
2930         ruleset_create_chain($ruleset, $chain);
2931         foreach my $rule (@{$std_chains->{$chain}}) {
2932             if (ref($rule)) {
2933                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule);
2934             } else {
2935                 ruleset_addrule($ruleset, $chain, $rule);
2936             }
2937         }
2938     }
2939 }
2940
2941 sub generate_ipset_chains {
2942     my ($ipset_ruleset, $clusterfw_conf, $fw_conf) = @_; #fixme
2943
2944     foreach my $ipset (keys %{$fw_conf->{ipset}}) {
2945
2946         my $options = $fw_conf->{ipset}->{$ipset};
2947
2948         # remove duplicates
2949         my $nethash = {};
2950         foreach my $entry (@$options) {
2951             next if $entry->{errors}; # skip entries with errors
2952             eval {
2953                 my ($cidr, $ver);
2954                 if ($entry->{cidr} =~ m/^${ip_alias_pattern}$/) {
2955                     ($cidr, $ver) = resolve_alias($clusterfw_conf, $fw_conf, $entry->{cidr});
2956                 } else {
2957                     ($cidr, $ver) = parse_ip_or_cidr($entry->{cidr});
2958                 }
2959                 #http://backreference.org/2013/03/01/ipv6-address-normalization/
2960                 if ($ver == 6) {
2961                     $cidr = lc(Net::IP::ip_compress_address($cidr, 6));
2962                     $cidr =~ s|/128$||;
2963                 } else {
2964                     $cidr =~ s|/32$||;
2965                 }
2966
2967                 $nethash->{$ver}->{$cidr} = { cidr => $cidr, nomatch => $entry->{nomatch} };
2968             };
2969             warn $@ if $@;
2970         }
2971
2972         foreach my $ipversion (4, 6) {
2973             my $data = $nethash->{$ipversion};
2974
2975             my $name = compute_ipset_chain_name($fw_conf->{vmid}, $ipset, $ipversion);
2976
2977             my $hashsize = scalar(@$options);
2978             if ($hashsize <= 64) {
2979                 $hashsize = 64;
2980             } else {
2981                 $hashsize = round_powerof2($hashsize);
2982             }
2983
2984             my $family = $ipversion == "6" ? "inet6" : "inet";
2985
2986             $ipset_ruleset->{$name} = ["create $name hash:net family $family hashsize $hashsize maxelem $hashsize"];
2987
2988             foreach my $cidr (sort keys %$data) {
2989                 my $entry = $data->{$cidr};
2990
2991                 my $cmd = "add $name $cidr";
2992                 if ($entry->{nomatch}) {
2993                     if ($feature_ipset_nomatch) {
2994                         push @{$ipset_ruleset->{$name}}, "$cmd nomatch";
2995                     } else {
2996                         warn "ignore !$cidr - nomatch not supported by kernel\n";
2997                     }
2998                 } else {
2999                     push @{$ipset_ruleset->{$name}}, $cmd;
3000                 }
3001             }
3002         }
3003     }
3004 }
3005
3006 sub round_powerof2 {
3007     my ($int) = @_;
3008
3009     $int--;
3010     $int |= $int >> $_ foreach (1,2,4,8,16);
3011     return ++$int;
3012 }
3013
3014 sub load_clusterfw_conf {
3015     my ($filename, $verbose) = @_;
3016
3017     $filename = $clusterfw_conf_filename if !defined($filename);
3018
3019     my $cluster_conf = {};
3020     if (my $fh = IO::File->new($filename, O_RDONLY)) {
3021         $cluster_conf = parse_clusterfw_config($filename, $fh, $verbose);
3022     }
3023
3024     return $cluster_conf;
3025 }
3026
3027 sub save_clusterfw_conf {
3028     my ($cluster_conf) = @_;
3029
3030     my $raw = '';
3031
3032     my $options = $cluster_conf->{options};
3033     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3034
3035     my $aliases = $cluster_conf->{aliases};
3036     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3037
3038     $raw .= &$format_ipsets($cluster_conf) if $cluster_conf->{ipset};
3039
3040     my $rules = $cluster_conf->{rules};
3041     if ($rules && scalar(@$rules)) {
3042         $raw .= "[RULES]\n\n";
3043         $raw .= &$format_rules($rules, 1);
3044         $raw .= "\n";
3045     }
3046
3047     if ($cluster_conf->{groups}) {
3048         foreach my $group (sort keys %{$cluster_conf->{groups}}) {
3049             my $rules = $cluster_conf->{groups}->{$group};
3050             if (my $comment = $cluster_conf->{group_comments}->{$group}) {
3051                 my $utf8comment = encode('utf8', $comment);
3052                 $raw .= "[group $group] # $utf8comment\n\n";
3053             } else {
3054                 $raw .= "[group $group]\n\n";
3055             }
3056
3057             $raw .= &$format_rules($rules, 0);
3058             $raw .= "\n";
3059         }
3060     }
3061
3062     if ($raw) {
3063         mkdir $pvefw_conf_dir;
3064         PVE::Tools::file_set_contents($clusterfw_conf_filename, $raw);
3065     } else {
3066         unlink $clusterfw_conf_filename;
3067     }
3068 }
3069
3070 sub load_hostfw_conf {
3071     my ($cluster_conf, $filename, $verbose) = @_;
3072
3073     $filename = $hostfw_conf_filename if !defined($filename);
3074
3075     my $hostfw_conf = {};
3076     if (my $fh = IO::File->new($filename, O_RDONLY)) {
3077         $hostfw_conf = parse_hostfw_config($filename, $fh, $cluster_conf, $verbose);
3078     }
3079     return $hostfw_conf;
3080 }
3081
3082 sub save_hostfw_conf {
3083     my ($hostfw_conf) = @_;
3084
3085     my $raw = '';
3086
3087     my $options = $hostfw_conf->{options};
3088     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3089
3090     my $rules = $hostfw_conf->{rules};
3091     if ($rules && scalar(@$rules)) {
3092         $raw .= "[RULES]\n\n";
3093         $raw .= &$format_rules($rules, 1);
3094         $raw .= "\n";
3095     }
3096
3097     if ($raw) {
3098         PVE::Tools::file_set_contents($hostfw_conf_filename, $raw);
3099     } else {
3100         unlink $hostfw_conf_filename;
3101     }
3102 }
3103
3104 sub compile {
3105     my ($cluster_conf, $hostfw_conf, $vmdata, $verbose) = @_;
3106
3107     my $vmfw_configs;
3108
3109     if ($vmdata) { # test mode
3110         my $testdir = $vmdata->{testdir} || die "no test directory specified";
3111         my $filename = "$testdir/cluster.fw";
3112         $cluster_conf = load_clusterfw_conf($filename, $verbose);
3113
3114         $filename = "$testdir/host.fw";
3115         $hostfw_conf = load_hostfw_conf($cluster_conf, $filename, $verbose);
3116
3117         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, $testdir, $verbose);
3118     } else { # normal operation
3119         $cluster_conf = load_clusterfw_conf(undef, $verbose) if !$cluster_conf;
3120
3121         $hostfw_conf = load_hostfw_conf($cluster_conf, undef, $verbose) if !$hostfw_conf;
3122
3123         $vmdata = read_local_vm_config();
3124         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, undef, $verbose);
3125     }
3126
3127     my ($ruleset, $ipset_ruleset) = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 4, $verbose);
3128     my ($rulesetv6) = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 6, $verbose);
3129
3130     return ($ruleset, $ipset_ruleset, $rulesetv6);
3131 }
3132
3133 sub compile_iptables_filter {
3134     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $ipversion, $verbose) = @_;
3135
3136     my $localnet;
3137     if ($cluster_conf->{aliases}->{local_network}) {
3138         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3139     } else {
3140         my $localnet_ver;
3141         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3142
3143         $cluster_conf->{aliases}->{local_network} = {
3144             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3145     }
3146
3147     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3148
3149     return ({}, {}) if !$cluster_conf->{options}->{enable};
3150
3151     my $ruleset = {};
3152
3153     ruleset_create_chain($ruleset, "PVEFW-INPUT");
3154     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
3155
3156     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3157
3158     my $hostfw_options = $hostfw_conf->{options} || {};
3159
3160     # fixme: what log level should we use here?
3161     my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
3162
3163     ruleset_chain_add_conn_filters($ruleset, "PVEFW-FORWARD", "ACCEPT");
3164
3165     ruleset_create_chain($ruleset, "PVEFW-FWBR-IN");
3166     ruleset_chain_add_input_filters($ruleset, "PVEFW-FWBR-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
3167
3168     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-in fwln+ -j PVEFW-FWBR-IN");
3169
3170     ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3171     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-out fwln+ -j PVEFW-FWBR-OUT");
3172
3173     generate_std_chains($ruleset, $hostfw_options, $ipversion);
3174
3175     my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
3176
3177     my $ipset_ruleset = {};
3178
3179     if ($hostfw_enable) {
3180         eval { enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf, $ipversion); };
3181         warn $@ if $@; # just to be sure - should not happen
3182     }
3183
3184     # generate firewall rules for QEMU VMs
3185     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3186         eval {
3187             my $conf = $vmdata->{qemu}->{$vmid};
3188             my $vmfw_conf = $vmfw_configs->{$vmid};
3189             return if !$vmfw_conf;
3190
3191             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf);
3192
3193             foreach my $netid (keys %$conf) {
3194                 next if $netid !~ m/^net(\d+)$/;
3195                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3196                 next if !$net->{firewall};
3197                 my $iface = "tap${vmid}i$1";
3198
3199                 my $macaddr = $net->{macaddr};
3200                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3201                                              $vmfw_conf, $vmid, 'IN', $ipversion);
3202                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3203                                              $vmfw_conf, $vmid, 'OUT', $ipversion);
3204             }
3205         };
3206         warn $@ if $@; # just to be sure - should not happen
3207     }
3208
3209     # generate firewall rules for LXC containers
3210     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3211         eval {
3212             my $conf = $vmdata->{lxc}->{$vmid};
3213             my $vmfw_conf = $vmfw_configs->{$vmid};
3214             return if !$vmfw_conf;
3215
3216             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf);
3217
3218             if ($vmfw_conf->{options}->{enable}) {
3219                 foreach my $netid (keys %$conf) {
3220                     next if $netid !~ m/^net(\d+)$/;
3221                     my $net = PVE::LXC::parse_lxc_network($conf->{$netid});
3222                     next if !$net->{firewall};
3223                     my $iface = "veth${vmid}i$1";
3224                     my $macaddr = $net->{hwaddr};
3225                     generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3226                                                  $vmfw_conf, $vmid, 'IN', $ipversion);
3227                     generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3228                                                  $vmfw_conf, $vmid, 'OUT', $ipversion);
3229                 }
3230             }
3231         };
3232         warn $@ if $@; # just to be sure - should not happen
3233     }
3234
3235     if(ruleset_chain_exist($ruleset, "PVEFW-IPS")){
3236         ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j PVEFW-IPS");
3237     }
3238
3239     generate_ipset_chains($ipset_ruleset, undef, $cluster_conf);
3240
3241     return ($ruleset, $ipset_ruleset);
3242 }
3243
3244 sub get_ruleset_status {
3245     my ($ruleset, $active_chains, $digest_fn, $verbose) = @_;
3246
3247     my $statushash = {};
3248
3249     foreach my $chain (sort keys %$ruleset) {
3250         my $sig = &$digest_fn($ruleset->{$chain});
3251
3252         $statushash->{$chain}->{sig} = $sig;
3253
3254         my $oldsig = $active_chains->{$chain};
3255         if (!defined($oldsig)) {
3256             $statushash->{$chain}->{action} = 'create';
3257         } else {
3258             if ($oldsig eq $sig) {
3259                 $statushash->{$chain}->{action} = 'exists';
3260             } else {
3261                 $statushash->{$chain}->{action} = 'update';
3262             }
3263         }
3264         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
3265         foreach my $cmd (@{$ruleset->{$chain}}) {
3266             print "\t$cmd\n" if $verbose;
3267         }
3268     }
3269
3270     foreach my $chain (sort keys %$active_chains) {
3271         if (!defined($ruleset->{$chain})) {
3272             my $sig = $active_chains->{$chain};
3273             $statushash->{$chain}->{action} = 'delete';
3274             $statushash->{$chain}->{sig} = $sig;
3275             print "delete $chain ($sig)\n" if $verbose;
3276         }
3277     }
3278
3279     return $statushash;
3280 }
3281
3282 sub print_sig_rule {
3283     my ($chain, $sig) = @_;
3284
3285     # We just use this to store a SHA1 checksum used to detect changes
3286     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
3287 }
3288
3289 sub get_ruleset_cmdlist {
3290     my ($ruleset, $verbose, $iptablescmd) = @_;
3291
3292     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
3293
3294     my ($active_chains, $hooks) = iptables_get_chains($iptablescmd);
3295     my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, $verbose);
3296
3297     # create missing chains first
3298     foreach my $chain (sort keys %$ruleset) {
3299         my $stat = $statushash->{$chain};
3300         die "internal error" if !$stat;
3301         next if $stat->{action} ne 'create';
3302
3303         $cmdlist .= ":$chain - [0:0]\n";
3304     }
3305
3306     foreach my $h (qw(INPUT OUTPUT FORWARD)) {
3307         my $chain = "PVEFW-$h";
3308         if ($ruleset->{$chain} && !$hooks->{$h}) {
3309             $cmdlist .= "-A $h -j $chain\n";
3310         }
3311     }
3312
3313     foreach my $chain (sort keys %$ruleset) {
3314         my $stat = $statushash->{$chain};
3315         die "internal error" if !$stat;
3316
3317         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
3318             $cmdlist .= "-F $chain\n";
3319             foreach my $cmd (@{$ruleset->{$chain}}) {
3320                 $cmdlist .= "$cmd\n";
3321             }
3322             $cmdlist .= print_sig_rule($chain, $stat->{sig});
3323         } elsif ($stat->{action} eq 'delete') {
3324             die "internal error"; # this should not happen
3325         } elsif ($stat->{action} eq 'exists') {
3326             # do nothing
3327         } else {
3328             die "internal error - unknown status '$stat->{action}'";
3329         }
3330     }
3331
3332     foreach my $chain (keys %$statushash) {
3333         next if $statushash->{$chain}->{action} ne 'delete';
3334         $cmdlist .= "-F $chain\n";
3335     }
3336     foreach my $chain (keys %$statushash) {
3337         next if $statushash->{$chain}->{action} ne 'delete';
3338         next if $chain eq 'PVEFW-INPUT';
3339         next if $chain eq 'PVEFW-OUTPUT';
3340         next if $chain eq 'PVEFW-FORWARD';
3341         $cmdlist .= "-X $chain\n";
3342     }
3343
3344     my $changes = $cmdlist ne "*filter\n" ? 1 : 0;
3345
3346     $cmdlist .= "COMMIT\n";
3347
3348     return wantarray ? ($cmdlist, $changes) : $cmdlist;
3349 }
3350
3351 sub get_ipset_cmdlist {
3352     my ($ruleset, $verbose) = @_;
3353
3354     my $cmdlist = "";
3355
3356     my $delete_cmdlist = "";
3357
3358     my $active_chains = ipset_get_chains();
3359     my $statushash = get_ruleset_status($ruleset, $active_chains, \&ipset_chain_digest, $verbose);
3360
3361     # remove stale _swap chains
3362     foreach my $chain (keys %$active_chains) {
3363         if ($chain =~ m/^PVEFW-\S+_swap$/) {
3364             $cmdlist .= "destroy $chain\n";
3365         }
3366     }
3367
3368     foreach my $chain (keys %$ruleset) {
3369         my $stat = $statushash->{$chain};
3370         die "internal error" if !$stat;
3371
3372         if ($stat->{action} eq 'create') {
3373             foreach my $cmd (@{$ruleset->{$chain}}) {
3374                 $cmdlist .= "$cmd\n";
3375             }
3376         }
3377     }
3378
3379     foreach my $chain (keys %$ruleset) {
3380         my $stat = $statushash->{$chain};
3381         die "internal error" if !$stat;
3382
3383         if ($stat->{action} eq 'update') {
3384             my $chain_swap = $chain."_swap";
3385
3386             foreach my $cmd (@{$ruleset->{$chain}}) {
3387                 $cmd =~ s/$chain/$chain_swap/;
3388                 $cmdlist .= "$cmd\n";
3389             }
3390             $cmdlist .= "swap $chain_swap $chain\n";
3391             $cmdlist .= "flush $chain_swap\n";
3392             $cmdlist .= "destroy $chain_swap\n";
3393         }
3394     }
3395
3396      # the remove unused chains
3397     foreach my $chain (keys %$statushash) {
3398         next if $statushash->{$chain}->{action} ne 'delete';
3399
3400         $delete_cmdlist .= "flush $chain\n";
3401         $delete_cmdlist .= "destroy $chain\n";
3402     }
3403
3404     my $changes = ($cmdlist || $delete_cmdlist) ? 1 : 0;
3405
3406     return ($cmdlist, $delete_cmdlist, $changes);
3407 }
3408
3409 sub apply_ruleset {
3410     my ($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $verbose) = @_;
3411
3412     enable_bridge_firewall();
3413
3414     my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
3415         get_ipset_cmdlist($ipset_ruleset, undef, $verbose);
3416
3417     my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset, $verbose);
3418     my ($cmdlistv6, $changesv6) = get_ruleset_cmdlist($rulesetv6, $verbose, "ip6tables");
3419
3420     if ($verbose) {
3421         if ($ipset_changes) {
3422             print "ipset changes:\n";
3423             print $ipset_create_cmdlist if $ipset_create_cmdlist;
3424             print $ipset_delete_cmdlist if $ipset_delete_cmdlist;
3425         }
3426
3427         if ($changes) {
3428             print "iptables changes:\n";
3429             print $cmdlist;
3430         }
3431
3432         if ($changesv6) {
3433             print "ip6tables changes:\n";
3434             print $cmdlistv6;
3435         }
3436     }
3437
3438     my $tmpfile = "$pve_fw_status_dir/ipsetcmdlist1";
3439     PVE::Tools::file_set_contents($tmpfile, $ipset_create_cmdlist || '');
3440
3441     ipset_restore_cmdlist($ipset_create_cmdlist);
3442
3443     $tmpfile = "$pve_fw_status_dir/ip4cmdlist";
3444     PVE::Tools::file_set_contents($tmpfile, $cmdlist || '');
3445
3446     iptables_restore_cmdlist($cmdlist);
3447
3448     $tmpfile = "$pve_fw_status_dir/ip6cmdlist";
3449     PVE::Tools::file_set_contents($tmpfile, $cmdlistv6 || '');
3450
3451     ip6tables_restore_cmdlist($cmdlistv6);
3452
3453     $tmpfile = "$pve_fw_status_dir/ipsetcmdlist2";
3454     PVE::Tools::file_set_contents($tmpfile, $ipset_delete_cmdlist || '');
3455
3456     ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
3457
3458     # test: re-read status and check if everything is up to date
3459     my $active_chains = iptables_get_chains();
3460     my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, 0);
3461
3462     my $errors;
3463     foreach my $chain (sort keys %$ruleset) {
3464         my $stat = $statushash->{$chain};
3465         if ($stat->{action} ne 'exists') {
3466             warn "unable to update chain '$chain'\n";
3467             $errors = 1;
3468         }
3469     }
3470
3471     my $active_chainsv6 = iptables_get_chains("ip6tables");
3472     my $statushashv6 = get_ruleset_status($rulesetv6, $active_chainsv6, \&iptables_chain_digest, 0);
3473
3474     foreach my $chain (sort keys %$rulesetv6) {
3475         my $stat = $statushashv6->{$chain};
3476         if ($stat->{action} ne 'exists') {
3477             warn "unable to update chain '$chain'\n";
3478             $errors = 1;
3479         }
3480     }
3481
3482     die "unable to apply firewall changes\n" if $errors;
3483
3484     update_nf_conntrack_max($hostfw_conf);
3485
3486     update_nf_conntrack_tcp_timeout_established($hostfw_conf);
3487
3488 }
3489
3490 sub update_nf_conntrack_max {
3491     my ($hostfw_conf) = @_;
3492
3493     my $max = 65536; # reasonable default
3494
3495     my $options = $hostfw_conf->{options} || {};
3496
3497     if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
3498         $max = $options->{nf_conntrack_max};
3499         $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
3500     }
3501
3502     my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
3503     my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
3504
3505     my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
3506
3507     if ($current != $max) {
3508         my $hashsize = int($max/4);
3509         PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
3510         PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
3511     }
3512 }
3513
3514 sub update_nf_conntrack_tcp_timeout_established {
3515     my ($hostfw_conf) = @_;
3516
3517     my $options = $hostfw_conf->{options} || {};
3518
3519     my $value = defined($options->{nf_conntrack_tcp_timeout_established}) ? $options->{nf_conntrack_tcp_timeout_established} : 432000;
3520
3521     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established", $value);
3522 }
3523
3524 sub remove_pvefw_chains {
3525
3526     PVE::Firewall::remove_pvefw_chains_iptables("iptables");
3527     PVE::Firewall::remove_pvefw_chains_iptables("ip6tables");
3528     PVE::Firewall::remove_pvefw_chains_ipset();
3529
3530 }
3531
3532 sub remove_pvefw_chains_iptables {
3533     my ($iptablescmd) = @_;
3534
3535     my ($chash, $hooks) = iptables_get_chains($iptablescmd);
3536     my $cmdlist = "*filter\n";
3537
3538     foreach my $h (qw(INPUT OUTPUT FORWARD)) {
3539         if ($hooks->{$h}) {
3540             $cmdlist .= "-D $h -j PVEFW-$h\n";
3541         }
3542     }
3543
3544     foreach my $chain (keys %$chash) {
3545         $cmdlist .= "-F $chain\n";
3546     }
3547
3548     foreach my $chain (keys %$chash) {
3549         $cmdlist .= "-X $chain\n";
3550     }
3551     $cmdlist .= "COMMIT\n";
3552
3553     if($iptablescmd eq "ip6tables") {
3554         ip6tables_restore_cmdlist($cmdlist);
3555     } else {
3556         iptables_restore_cmdlist($cmdlist);
3557     }
3558 }
3559
3560 sub remove_pvefw_chains_ipset {
3561
3562     my $ipset_chains = ipset_get_chains();
3563
3564     my $cmdlist = "";
3565
3566     foreach my $chain (keys %$ipset_chains) {
3567         $cmdlist .= "flush $chain\n";
3568         $cmdlist .= "destroy $chain\n";
3569     }
3570
3571     ipset_restore_cmdlist($cmdlist) if $cmdlist;
3572 }
3573
3574 sub init {
3575     my $cluster_conf = load_clusterfw_conf();
3576     my $cluster_options = $cluster_conf->{options};
3577     my $enable = $cluster_options->{enable};
3578
3579     return if !$enable;
3580
3581     # load required modules here
3582 }
3583
3584 sub update {
3585     my $code = sub {
3586
3587         my $cluster_conf = load_clusterfw_conf();
3588         my $cluster_options = $cluster_conf->{options};
3589
3590         if (!$cluster_options->{enable}) {
3591             PVE::Firewall::remove_pvefw_chains();
3592             return;
3593         }
3594
3595         my $hostfw_conf = load_hostfw_conf($cluster_conf);
3596
3597         my ($ruleset, $ipset_ruleset, $rulesetv6) = compile($cluster_conf, $hostfw_conf);
3598
3599         apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6);
3600     };
3601
3602     run_locked($code);
3603 }
3604
3605 1;