src/PVE/Firewall.pm

   1 package PVE::Firewall;
   2
   3 use warnings;
   4 use strict;
   5
   6 use Digest::SHA;
   7 use Encode;
   8 use File::Basename;
   9 use File::Path;
  10 use IO::File;
  11 use Net::IP;
  12 use POSIX;
  13 use Socket qw(AF_INET AF_INET6 inet_ntop inet_pton);
  14 use Storable qw(dclone);
  15
  16 use PVE::Cluster;
  17 use PVE::Corosync;
  18 use PVE::Exception qw(raise raise_param_exc);
  19 use PVE::INotify;
  20 use PVE::JSONSchema qw(register_standard_option get_standard_option);
  21 use PVE::Network;
  22 use PVE::ProcFSTools;
  23 use PVE::SafeSyslog;
  24 use PVE::Tools qw($IPV4RE $IPV6RE);
  25 use PVE::Tools qw(run_command lock_file dir_glob_foreach);
  26
  27 my $pvefw_conf_dir = "/etc/pve/firewall";
  28 my $clusterfw_conf_filename = "$pvefw_conf_dir/cluster.fw";
  29
  30 # dynamically include PVE::QemuServer and PVE::LXC
  31 # to avoid dependency problems
  32 my $have_qemu_server;
  33 eval {
  34     require PVE::QemuServer;
  35     require PVE::QemuConfig;
  36     $have_qemu_server = 1;
  37 };
  38
  39 my $have_lxc;
  40 eval {
  41     require PVE::LXC;
  42     $have_lxc = 1;
  43 };
  44
  45 my $pve_fw_status_dir = "/var/lib/pve-firewall";
  46
  47 mkdir $pve_fw_status_dir; # make sure this exists
  48
  49 my $security_group_name_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  50 my $ipset_name_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  51 our $ip_alias_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  52
  53 my $max_alias_name_length = 64;
  54 my $max_ipset_name_length = 64;
  55 my $max_group_name_length = 18;
  56
  57 my $PROTOCOLS_WITH_PORTS = {
  58     udp => 1,     17 => 1,
  59     udplite => 1, 136 => 1,
  60     tcp => 1,     6 => 1,
  61     dccp => 1,    33 => 1,
  62     sctp => 1,    132 => 1,
  63 };
  64
  65 PVE::JSONSchema::register_format('IPorCIDR', \&pve_verify_ip_or_cidr);
  66 sub pve_verify_ip_or_cidr {
  67     my ($cidr, $noerr) = @_;
  68
  69     if ($cidr =~ m!^(?:$IPV6RE|$IPV4RE)(/(\d+))?$!) {
  70         return $cidr if Net::IP->new($cidr);
  71         return undef if $noerr;
  72         die Net::IP::Error() . "\n";
  73     }
  74     return undef if $noerr;
  75     die "value does not look like a valid IP address or CIDR network\n";
  76 }
  77
  78 PVE::JSONSchema::register_format('IPorCIDRorAlias', \&pve_verify_ip_or_cidr_or_alias);
  79 sub pve_verify_ip_or_cidr_or_alias {
  80     my ($cidr, $noerr) = @_;
  81
  82     return if $cidr =~ m/^(?:$ip_alias_pattern)$/;
  83
  84     return pve_verify_ip_or_cidr($cidr, $noerr);
  85 }
  86
  87 PVE::JSONSchema::register_standard_option('ipset-name', {
  88     description => "IP set name.",
  89     type => 'string',
  90     pattern => $ipset_name_pattern,
  91     minLength => 2,
  92     maxLength => $max_ipset_name_length,
  93 });
  94
  95 PVE::JSONSchema::register_standard_option('pve-fw-alias', {
  96     description => "Alias name.",
  97     type => 'string',
  98     pattern => $ip_alias_pattern,
  99     minLength => 2,
 100     maxLength => $max_alias_name_length,
 101 });
 102
 103 PVE::JSONSchema::register_standard_option('pve-fw-loglevel' => {
 104     description => "Log level.",
 105     type => 'string',
 106     enum => ['emerg', 'alert', 'crit', 'err', 'warning', 'notice', 'info', 'debug', 'nolog'],
 107     optional => 1,
 108 });
 109
 110 PVE::JSONSchema::register_standard_option('pve-security-group-name', {
 111     description => "Security Group name.",
 112     type => 'string',
 113     pattern => $security_group_name_pattern,
 114     minLength => 2,
 115     maxLength => $max_group_name_length,
 116 });
 117
 118 my $feature_ipset_nomatch = 0;
 119 eval  {
 120     my (undef, undef, $release) = POSIX::uname();
 121     if ($release =~ m/^(\d+)\.(\d+)\.\d+-/) {
 122         my ($major, $minor) = ($1, $2);
 123         $feature_ipset_nomatch = 1 if ($major > 3) ||
 124             ($major == 3 && $minor >= 7);
 125     }
 126
 127 };
 128
 129 my $nodename = PVE::INotify::nodename();
 130 my $hostfw_conf_filename = "/etc/pve/nodes/$nodename/host.fw";
 131
 132 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
 133
 134 my $default_log_level = 'nolog'; # avoid logs by default
 135 my $global_log_ratelimit = '--limit 1/sec';
 136
 137 my $log_level_hash = {
 138     debug => 7,
 139     info => 6,
 140     notice => 5,
 141     warning => 4,
 142     err => 3,
 143     crit => 2,
 144     alert => 1,
 145     emerg => 0,
 146 };
 147
 148 my $verbose = 0;
 149 sub set_verbose {
 150     $verbose = shift;
 151 }
 152
 153 # %rule
 154 #
 155 # name => optional
 156 # enable => [0|1]
 157 # action =>
 158 # proto =>
 159 # sport => port[,port[,port]].. or port:port
 160 # dport => port[,port[,port]].. or port:port
 161 # log => optional, loglevel
 162 # logmsg => optional, logmsg - overwrites default
 163 # iface_in => incomin interface
 164 # iface_out => outgoing interface
 165 # match => optional, overwrites generation of match
 166 # target => optional, overwrites action
 167
 168 # we need to overwrite some macros for ipv6
 169 my $pve_ipv6fw_macros = {
 170     'Ping' => [
 171         { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
 172     ],
 173     'NeighborDiscovery' => [
 174         "IPv6 neighbor solicitation, neighbor and router advertisement",
 175         { action => 'PARAM', proto => 'icmpv6', dport => 'router-solicitation' },
 176         { action => 'PARAM', proto => 'icmpv6', dport => 'router-advertisement' },
 177         { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-solicitation' },
 178         { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-advertisement' },
 179     ],
 180     'DHCPv6' => [
 181         "DHCPv6 traffic",
 182         { action => 'PARAM', proto => 'udp', dport => '546:547', sport => '546:547' },
 183     ],
 184     'Trcrt' => [
 185         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 186         { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
 187     ],
 188  };
 189
 190 # imported/converted from: /usr/share/shorewall/macro.*
 191 my $pve_fw_macros = {
 192     'Amanda' => [
 193         "Amanda Backup",
 194         { action => 'PARAM', proto => 'udp', dport => '10080' },
 195         { action => 'PARAM', proto => 'tcp', dport => '10080' },
 196     ],
 197     'Auth' => [
 198         "Auth (identd) traffic",
 199         { action => 'PARAM', proto => 'tcp', dport => '113' },
 200     ],
 201     'BGP' => [
 202         "Border Gateway Protocol traffic",
 203         { action => 'PARAM', proto => 'tcp', dport => '179' },
 204     ],
 205     'BitTorrent' => [
 206         "BitTorrent traffic for BitTorrent 3.1 and earlier",
 207         { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
 208         { action => 'PARAM', proto => 'udp', dport => '6881' },
 209     ],
 210     'BitTorrent32' => [
 211         "BitTorrent traffic for BitTorrent 3.2 and later",
 212         { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
 213         { action => 'PARAM', proto => 'udp', dport => '6881' },
 214     ],
 215     'Ceph' => [
 216         "Ceph Storage Cluster traffic (Ceph Monitors, OSD & MDS Deamons)",
 217         # Legacy port for protocol v1
 218         { action => 'PARAM', proto => 'tcp', dport => '6789' },
 219         # New port for protocol v2
 220         { action => 'PARAM', proto => 'tcp', dport => '3300' },
 221         { action => 'PARAM', proto => 'tcp', dport => '6800:7300' },
 222     ],
 223     'CVS' => [
 224         "Concurrent Versions System pserver traffic",
 225         { action => 'PARAM', proto => 'tcp', dport => '2401' },
 226     ],
 227     'Citrix' => [
 228         "Citrix/ICA traffic (ICA, ICA Browser, CGP)",
 229         { action => 'PARAM', proto => 'tcp', dport => '1494' },
 230         { action => 'PARAM', proto => 'udp', dport => '1604' },
 231         { action => 'PARAM', proto => 'tcp', dport => '2598' },
 232     ],
 233     'DAAP' => [
 234         "Digital Audio Access Protocol traffic (iTunes, Rythmbox daemons)",
 235         { action => 'PARAM', proto => 'tcp', dport => '3689' },
 236         { action => 'PARAM', proto => 'udp', dport => '3689' },
 237     ],
 238     'DCC' => [
 239         "Distributed Checksum Clearinghouse spam filtering mechanism",
 240         { action => 'PARAM', proto => 'tcp', dport => '6277' },
 241     ],
 242     'DHCPfwd' => [
 243         "Forwarded DHCP traffic",
 244         { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
 245     ],
 246     'DNS' => [
 247         "Domain Name System traffic (upd and tcp)",
 248         { action => 'PARAM', proto => 'udp', dport => '53' },
 249         { action => 'PARAM', proto => 'tcp', dport => '53' },
 250     ],
 251     'Distcc' => [
 252         "Distributed Compiler service",
 253         { action => 'PARAM', proto => 'tcp', dport => '3632' },
 254     ],
 255     'FTP' => [
 256         "File Transfer Protocol",
 257         { action => 'PARAM', proto => 'tcp', dport => '21' },
 258     ],
 259     'Finger' => [
 260         "Finger protocol (RFC 742)",
 261         { action => 'PARAM', proto => 'tcp', dport => '79' },
 262     ],
 263     'GNUnet' => [
 264         "GNUnet secure peer-to-peer networking traffic",
 265         { action => 'PARAM', proto => 'tcp', dport => '2086' },
 266         { action => 'PARAM', proto => 'udp', dport => '2086' },
 267         { action => 'PARAM', proto => 'tcp', dport => '1080' },
 268         { action => 'PARAM', proto => 'udp', dport => '1080' },
 269     ],
 270     'GRE' => [
 271         "Generic Routing Encapsulation tunneling protocol",
 272         { action => 'PARAM', proto => '47' },
 273     ],
 274     'Git' => [
 275         "Git distributed revision control traffic",
 276         { action => 'PARAM', proto => 'tcp', dport => '9418' },
 277     ],
 278     'HKP' => [
 279         "OpenPGP HTTP keyserver protocol traffic",
 280         { action => 'PARAM', proto => 'tcp', dport => '11371' },
 281     ],
 282     'HTTP' => [
 283         "Hypertext Transfer Protocol (WWW)",
 284         { action => 'PARAM', proto => 'tcp', dport => '80' },
 285     ],
 286     'HTTPS' => [
 287         "Hypertext Transfer Protocol (WWW) over SSL",
 288         { action => 'PARAM', proto => 'tcp', dport => '443' },
 289     ],
 290     'ICPV2' => [
 291         "Internet Cache Protocol V2 (Squid) traffic",
 292         { action => 'PARAM', proto => 'udp', dport => '3130' },
 293     ],
 294     'ICQ' => [
 295         "AOL Instant Messenger traffic",
 296         { action => 'PARAM', proto => 'tcp', dport => '5190' },
 297     ],
 298     'IMAP' => [
 299         "Internet Message Access Protocol",
 300         { action => 'PARAM', proto => 'tcp', dport => '143' },
 301     ],
 302     'IMAPS' => [
 303         "Internet Message Access Protocol over SSL",
 304         { action => 'PARAM', proto => 'tcp', dport => '993' },
 305     ],
 306     'IPIP' => [
 307         "IPIP capsulation traffic",
 308         { action => 'PARAM', proto => '94' },
 309     ],
 310     'IPsec' => [
 311         "IPsec traffic",
 312         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 313         { action => 'PARAM', proto => '50' },
 314     ],
 315     'IPsecah' => [
 316         "IPsec authentication (AH) traffic",
 317         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 318         { action => 'PARAM', proto => '51' },
 319     ],
 320     'IPsecnat' => [
 321         "IPsec traffic and Nat-Traversal",
 322         { action => 'PARAM', proto => 'udp', dport => '500' },
 323         { action => 'PARAM', proto => 'udp', dport => '4500' },
 324         { action => 'PARAM', proto => '50' },
 325     ],
 326     'IRC' => [
 327         "Internet Relay Chat traffic",
 328         { action => 'PARAM', proto => 'tcp', dport => '6667' },
 329     ],
 330     'Jetdirect' => [
 331         "HP Jetdirect printing",
 332         { action => 'PARAM', proto => 'tcp', dport => '9100' },
 333     ],
 334     'L2TP' => [
 335         "Layer 2 Tunneling Protocol traffic",
 336         { action => 'PARAM', proto => 'udp', dport => '1701' },
 337     ],
 338     'LDAP' => [
 339         "Lightweight Directory Access Protocol traffic",
 340         { action => 'PARAM', proto => 'tcp', dport => '389' },
 341     ],
 342     'LDAPS' => [
 343         "Secure Lightweight Directory Access Protocol traffic",
 344         { action => 'PARAM', proto => 'tcp', dport => '636' },
 345     ],
 346     'MSNP' => [
 347         "Microsoft Notification Protocol",
 348         { action => 'PARAM', proto => 'tcp', dport => '1863' },
 349     ],
 350     'MSSQL' => [
 351         "Microsoft SQL Server",
 352         { action => 'PARAM', proto => 'tcp', dport => '1433' },
 353     ],
 354     'Mail' => [
 355         "Mail traffic (SMTP, SMTPS, Submission)",
 356         { action => 'PARAM', proto => 'tcp', dport => '25' },
 357         { action => 'PARAM', proto => 'tcp', dport => '465' },
 358         { action => 'PARAM', proto => 'tcp', dport => '587' },
 359     ],
 360     'MDNS' => [
 361         "Multicast DNS",
 362         { action => 'PARAM', proto => 'udp', dport => '5353' },
 363     ],
 364     'Munin' => [
 365         "Munin networked resource monitoring traffic",
 366         { action => 'PARAM', proto => 'tcp', dport => '4949' },
 367     ],
 368     'MySQL' => [
 369         "MySQL server",
 370         { action => 'PARAM', proto => 'tcp', dport => '3306' },
 371     ],
 372     'NNTP' => [
 373         "NNTP traffic (Usenet).",
 374         { action => 'PARAM', proto => 'tcp', dport => '119' },
 375     ],
 376     'NNTPS' => [
 377         "Encrypted NNTP traffic (Usenet)",
 378         { action => 'PARAM', proto => 'tcp', dport => '563' },
 379     ],
 380     'NTP' => [
 381         "Network Time Protocol (ntpd)",
 382         { action => 'PARAM', proto => 'udp', dport => '123' },
 383     ],
 384     'OSPF' => [
 385         "OSPF multicast traffic",
 386         { action => 'PARAM', proto => '89' },
 387     ],
 388     'OpenVPN' => [
 389         "OpenVPN traffic",
 390         { action => 'PARAM', proto => 'udp', dport => '1194' },
 391     ],
 392     'PCA' => [
 393         "Symantec PCAnywere (tm)",
 394         { action => 'PARAM', proto => 'udp', dport => '5632' },
 395         { action => 'PARAM', proto => 'tcp', dport => '5631' },
 396     ],
 397     'PMG' => [
 398         "Proxmox Mail Gateway web interface",
 399         { action => 'PARAM', proto => 'tcp', dport => '8006' },
 400     ],
 401     'POP3' => [
 402         "POP3 traffic",
 403         { action => 'PARAM', proto => 'tcp', dport => '110' },
 404     ],
 405     'POP3S' => [
 406         "Encrypted POP3 traffic",
 407         { action => 'PARAM', proto => 'tcp', dport => '995' },
 408     ],
 409     'PPtP' => [
 410         "Point-to-Point Tunneling Protocol",
 411         { action => 'PARAM', proto => '47' },
 412         { action => 'PARAM', proto => 'tcp', dport => '1723' },
 413     ],
 414     'Ping' => [
 415         "ICMP echo request",
 416         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 417     ],
 418     'PostgreSQL' => [
 419         "PostgreSQL server",
 420         { action => 'PARAM', proto => 'tcp', dport => '5432' },
 421     ],
 422     'Printer' => [
 423         "Line Printer protocol printing",
 424         { action => 'PARAM', proto => 'tcp', dport => '515' },
 425     ],
 426     'RDP' => [
 427         "Microsoft Remote Desktop Protocol traffic",
 428         { action => 'PARAM', proto => 'tcp', dport => '3389' },
 429     ],
 430     'RIP' => [
 431         "Routing Information Protocol (bidirectional)",
 432         { action => 'PARAM', proto => 'udp', dport => '520' },
 433     ],
 434     'RNDC' => [
 435         "BIND remote management protocol",
 436         { action => 'PARAM', proto => 'tcp', dport => '953' },
 437     ],
 438     'Razor' => [
 439         "Razor Antispam System",
 440         { action => 'PARAM', proto => 'tcp', dport => '2703' },
 441     ],
 442     'Rdate' => [
 443         "Remote time retrieval (rdate)",
 444         { action => 'PARAM', proto => 'tcp', dport => '37' },
 445     ],
 446     'Rsync' => [
 447         "Rsync server",
 448         { action => 'PARAM', proto => 'tcp', dport => '873' },
 449     ],
 450     'SANE' => [
 451         "SANE network scanning",
 452         { action => 'PARAM', proto => 'tcp', dport => '6566' },
 453     ],
 454     'SMB' => [
 455         "Microsoft SMB traffic",
 456         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 457         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 458         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 459         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 460     ],
 461     'SMBswat' => [
 462         "Samba Web Administration Tool",
 463         { action => 'PARAM', proto => 'tcp', dport => '901' },
 464     ],
 465     'SMTP' => [
 466         "Simple Mail Transfer Protocol",
 467         { action => 'PARAM', proto => 'tcp', dport => '25' },
 468     ],
 469     'SMTPS' => [
 470         "Encrypted Simple Mail Transfer Protocol",
 471         { action => 'PARAM', proto => 'tcp', dport => '465' },
 472     ],
 473     'SNMP' => [
 474         "Simple Network Management Protocol",
 475         { action => 'PARAM', proto => 'udp', dport => '161:162' },
 476         { action => 'PARAM', proto => 'tcp', dport => '161' },
 477     ],
 478     'SPAMD' => [
 479         "Spam Assassin SPAMD traffic",
 480         { action => 'PARAM', proto => 'tcp', dport => '783' },
 481     ],
 482     'SSH' => [
 483         "Secure shell traffic",
 484         { action => 'PARAM', proto => 'tcp', dport => '22' },
 485     ],
 486     'SVN' => [
 487         "Subversion server (svnserve)",
 488         { action => 'PARAM', proto => 'tcp', dport => '3690' },
 489     ],
 490     'SixXS' => [
 491         "SixXS IPv6 Deployment and Tunnel Broker",
 492         { action => 'PARAM', proto => 'tcp', dport => '3874' },
 493         { action => 'PARAM', proto => 'udp', dport => '3740' },
 494         { action => 'PARAM', proto => '41' },
 495         { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
 496     ],
 497     'Squid' => [
 498         "Squid web proxy traffic",
 499         { action => 'PARAM', proto => 'tcp', dport => '3128' },
 500     ],
 501     'Submission' => [
 502         "Mail message submission traffic",
 503         { action => 'PARAM', proto => 'tcp', dport => '587' },
 504     ],
 505     'Syslog' => [
 506         "Syslog protocol (RFC 5424) traffic",
 507         { action => 'PARAM', proto => 'udp', dport => '514' },
 508         { action => 'PARAM', proto => 'tcp', dport => '514' },
 509     ],
 510     'TFTP' => [
 511         "Trivial File Transfer Protocol traffic",
 512         { action => 'PARAM', proto => 'udp', dport => '69' },
 513     ],
 514     'Telnet' => [
 515         "Telnet traffic",
 516         { action => 'PARAM', proto => 'tcp', dport => '23' },
 517     ],
 518     'Telnets' => [
 519         "Telnet over SSL",
 520         { action => 'PARAM', proto => 'tcp', dport => '992' },
 521     ],
 522     'Time' => [
 523         "RFC 868 Time protocol",
 524         { action => 'PARAM', proto => 'tcp', dport => '37' },
 525     ],
 526     'Trcrt' => [
 527         "Traceroute (for up to 30 hops) traffic",
 528         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 529         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 530     ],
 531     'VNC' => [
 532         "VNC traffic for VNC display's 0 - 99",
 533         { action => 'PARAM', proto => 'tcp', dport => '5900:5999' },
 534     ],
 535     'VNCL' => [
 536         "VNC traffic from Vncservers to Vncviewers in listen mode",
 537         { action => 'PARAM', proto => 'tcp', dport => '5500' },
 538     ],
 539     'Web' => [
 540         "WWW traffic (HTTP and HTTPS)",
 541         { action => 'PARAM', proto => 'tcp', dport => '80' },
 542         { action => 'PARAM', proto => 'tcp', dport => '443' },
 543     ],
 544     'Webcache' => [
 545         "Web Cache/Proxy traffic (port 8080)",
 546         { action => 'PARAM', proto => 'tcp', dport => '8080' },
 547     ],
 548     'Webmin' => [
 549         "Webmin traffic",
 550         { action => 'PARAM', proto => 'tcp', dport => '10000' },
 551     ],
 552     'Whois' => [
 553         "Whois (nicname, RFC 3912) traffic",
 554         { action => 'PARAM', proto => 'tcp', dport => '43' },
 555     ],
 556 };
 557
 558 my $pve_fw_parsed_macros;
 559 my $pve_fw_macro_descr;
 560 my $pve_fw_macro_ipversion = {};
 561 my $pve_fw_preferred_macro_names = {};
 562
 563 my $FWACCEPTMARK_ON  = "0x80000000/0x80000000";
 564 my $FWACCEPTMARK_OFF = "0x00000000/0x80000000";
 565
 566 my $pve_std_chains = {};
 567 my $pve_std_chains_conf = {};
 568 $pve_std_chains_conf->{4} = {
 569     'PVEFW-SET-ACCEPT-MARK' => [
 570         { target => "-j MARK --set-mark $FWACCEPTMARK_ON" },
 571     ],
 572     'PVEFW-DropBroadcast' => [
 573         # same as shorewall 'Broadcast'
 574         # simply DROP BROADCAST/MULTICAST/ANYCAST
 575         # we can use this to reduce logging
 576         { action => 'DROP', dsttype => 'BROADCAST' },
 577         { action => 'DROP', dsttype => 'MULTICAST' },
 578         { action => 'DROP', dsttype => 'ANYCAST' },
 579         { action => 'DROP', dest => '224.0.0.0/4' },
 580     ],
 581     'PVEFW-reject' => [
 582         # same as shorewall 'reject'
 583         { action => 'DROP', dsttype => 'BROADCAST' },
 584         { action => 'DROP', source => '224.0.0.0/4' },
 585         { action => 'DROP', proto => 'icmp' },
 586         { match => '-p tcp', target => '-j REJECT --reject-with tcp-reset' },
 587         { match => '-p udp', target => '-j REJECT --reject-with icmp-port-unreachable' },
 588         { match => '-p icmp', target => '-j REJECT --reject-with icmp-host-unreachable' },
 589         { target => '-j REJECT --reject-with icmp-host-prohibited' },
 590     ],
 591     'PVEFW-Drop' => [
 592         # same as shorewall 'Drop', which is equal to DROP,
 593         # but REJECT/DROP some packages to reduce logging,
 594         # and ACCEPT critical ICMP types
 595         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 596         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 597         { action => 'PVEFW-DropBroadcast' },
 598         # ACCEPT critical ICMP types
 599         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 600         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 601         # Drop packets with INVALID state
 602         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 603         # Drop Microsoft SMB noise
 604         { action => 'DROP', proto => 'udp', dport => '135,445' },
 605         { action => 'DROP', proto => 'udp', dport => '137:139' },
 606         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 607         { action => 'DROP', proto => 'tcp', dport => '135,139,445' },
 608         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 609         # Drop new/NotSyn traffic so that it doesn't get logged
 610         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 611         # Drop DNS replies
 612         { action => 'DROP', proto => 'udp', sport => 53 },
 613     ],
 614     'PVEFW-Reject' => [
 615         # same as shorewall 'Reject', which is equal to Reject,
 616         # but REJECT/DROP some packages to reduce logging,
 617         # and ACCEPT critical ICMP types
 618         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 619         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 620         { action => 'PVEFW-DropBroadcast' },
 621         # ACCEPT critical ICMP types
 622         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 623         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 624         # Drop packets with INVALID state
 625         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 626         # Drop Microsoft SMB noise
 627         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445' },
 628         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
 629         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 630         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445' },
 631         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 632         # Drop new/NotSyn traffic so that it doesn't get logged
 633         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 634         # Drop DNS replies
 635         { action => 'DROP', proto => 'udp', sport => 53 },
 636     ],
 637     'PVEFW-tcpflags' => [
 638         # same as shorewall tcpflags action.
 639         # Packets arriving on this interface are checked for som illegal combinations of TCP flags
 640         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG', target => '-g PVEFW-logflags' },
 641         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE', target => '-g PVEFW-logflags' },
 642         { match => '-p tcp -m tcp --tcp-flags SYN,RST SYN,RST', target => '-g PVEFW-logflags' },
 643         { match => '-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN', target => '-g PVEFW-logflags' },
 644         { match => '-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN', target => '-g PVEFW-logflags' },
 645     ],
 646     'PVEFW-smurfs' => [
 647         # same as shorewall smurfs action
 648         # Filter packets for smurfs (packets with a broadcast address as the source).
 649         { match => '-s 0.0.0.0/32', target => '-j RETURN' }, # allow DHCP
 650         { match => '-m addrtype --src-type BROADCAST', target => '-g PVEFW-smurflog' },
 651         { match => '-s 224.0.0.0/4', target => '-g PVEFW-smurflog' },
 652     ],
 653     'PVEFW-smurflog' => [
 654         { action => 'DROP', logmsg => 'DROP: ' },
 655     ],
 656     'PVEFW-logflags' => [
 657         { action => 'DROP', logmsg => 'DROP: ' },
 658     ],
 659 };
 660
 661 $pve_std_chains_conf->{6} = {
 662     'PVEFW-SET-ACCEPT-MARK' => [
 663         { target => "-j MARK --set-mark $FWACCEPTMARK_ON" },
 664     ],
 665     'PVEFW-DropBroadcast' => [
 666         # same as shorewall 'Broadcast'
 667         # simply DROP BROADCAST/MULTICAST/ANYCAST
 668         # we can use this to reduce logging
 669         #{ action => 'DROP', dsttype => 'BROADCAST' }, #no broadcast in ipv6
 670         # ipv6 addrtype does not work with kernel 2.6.32
 671         #{ action => 'DROP', dsttype => 'MULTICAST' },
 672         #{ action => 'DROP', dsttype => 'ANYCAST' },
 673         { action => 'DROP', dest => 'ff00::/8' },
 674         #{ action => 'DROP', dest => '224.0.0.0/4' },
 675     ],
 676     'PVEFW-reject' => [
 677         { action => 'DROP', proto => 'icmpv6' },
 678         { match => '-p tcp', target => '-j REJECT --reject-with tcp-reset' },
 679         { match => '-p udp', target => '-j REJECT --reject-with icmp6-port-unreachable' },
 680         { target => '-j REJECT --reject-with icmp6-adm-prohibited' },
 681     ],
 682     'PVEFW-Drop' => [
 683         # same as shorewall 'Drop', which is equal to DROP,
 684         # but REJECT/DROP some packages to reduce logging,
 685         # and ACCEPT critical ICMP types
 686         { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
 687         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 688         { action => 'PVEFW-DropBroadcast' },
 689         # ACCEPT critical ICMP types
 690         { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
 691         { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
 692         { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
 693         # Drop packets with INVALID state
 694         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 695         # Drop Microsoft SMB noise
 696         { action => 'DROP', proto => 'udp', dport => '135,445' },
 697         { action => 'DROP', proto => 'udp', dport => '137:139'},
 698         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 699         { action => 'DROP', proto => 'tcp', dport => '135,139,445' },
 700         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 701         # Drop new/NotSyn traffic so that it doesn't get logged
 702         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 703         # Drop DNS replies
 704         { action => 'DROP', proto => 'udp', sport => 53 },
 705     ],
 706     'PVEFW-Reject' => [
 707         # same as shorewall 'Reject', which is equal to Reject,
 708         # but REJECT/DROP some packages to reduce logging,
 709         # and ACCEPT critical ICMP types
 710         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 711         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 712         { action => 'PVEFW-DropBroadcast' },
 713         # ACCEPT critical ICMP types
 714         { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
 715         { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
 716         { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
 717         # Drop packets with INVALID state
 718         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 719         # Drop Microsoft SMB noise
 720         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445' },
 721         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139' },
 722         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 723         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445' },
 724         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 725         # Drop new/NotSyn traffic so that it doesn't get logged
 726         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 727         # Drop DNS replies
 728         { action => 'DROP', proto => 'udp', sport => 53 },
 729     ],
 730     'PVEFW-tcpflags' => [
 731         # same as shorewall tcpflags action.
 732         # Packets arriving on this interface are checked for som illegal combinations of TCP flags
 733         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG', target => '-g PVEFW-logflags' },
 734         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE', target => '-g PVEFW-logflags' },
 735         { match => '-p tcp -m tcp --tcp-flags SYN,RST SYN,RST', target => '-g PVEFW-logflags' },
 736         { match => '-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN', target => '-g PVEFW-logflags' },
 737         { match => '-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN', target => '-g PVEFW-logflags' },
 738     ],
 739     'PVEFW-logflags' => [
 740         { action => 'DROP', logmsg => 'DROP: ' },
 741     ],
 742 };
 743
 744 # iptables -p icmp -h
 745 my $icmp_type_names = {
 746     any => 1,
 747     'echo-reply' => 1,
 748     'destination-unreachable' => 1,
 749     'network-unreachable' => 1,
 750     'host-unreachable' => 1,
 751     'protocol-unreachable' => 1,
 752     'port-unreachable' => 1,
 753     'fragmentation-needed' => 1,
 754     'source-route-failed' => 1,
 755     'network-unknown' => 1,
 756     'host-unknown' => 1,
 757     'network-prohibited' => 1,
 758     'host-prohibited' => 1,
 759     'TOS-network-unreachable' => 1,
 760     'TOS-host-unreachable' => 1,
 761     'communication-prohibited' => 1,
 762     'host-precedence-violation' => 1,
 763     'precedence-cutoff' => 1,
 764     'source-quench' => 1,
 765     'redirect' => 1,
 766     'network-redirect' => 1,
 767     'host-redirect' => 1,
 768     'TOS-network-redirect' => 1,
 769     'TOS-host-redirect' => 1,
 770     'echo-request' => 1,
 771     'router-advertisement' => 1,
 772     'router-solicitation' => 1,
 773     'time-exceeded' => 1,
 774     'ttl-zero-during-transit' => 1,
 775     'ttl-zero-during-reassembly' => 1,
 776     'parameter-problem' => 1,
 777     'ip-header-bad' => 1,
 778     'required-option-missing' => 1,
 779     'timestamp-request' => 1,
 780     'timestamp-reply' => 1,
 781     'address-mask-request' => 1,
 782     'address-mask-reply' => 1,
 783 };
 784
 785 # ip6tables -p icmpv6 -h
 786
 787 my $icmpv6_type_names = {
 788     'any' => 1,
 789     'destination-unreachable' => 1,
 790     'no-route' => 1,
 791     'communication-prohibited' => 1,
 792     'address-unreachable' => 1,
 793     'port-unreachable' => 1,
 794     'packet-too-big' => 1,
 795     'time-exceeded' => 1,
 796     'ttl-zero-during-transit' => 1,
 797     'ttl-zero-during-reassembly' => 1,
 798     'parameter-problem' => 1,
 799     'bad-header' => 1,
 800     'unknown-header-type' => 1,
 801     'unknown-option' => 1,
 802     'echo-request' => 1,
 803     'echo-reply' => 1,
 804     'router-solicitation' => 1,
 805     'router-advertisement' => 1,
 806     'neighbor-solicitation' => 1,
 807     'neighbour-solicitation' => 1,
 808     'neighbor-advertisement' => 1,
 809     'neighbour-advertisement' => 1,
 810     'redirect' => 1,
 811 };
 812
 813 sub init_firewall_macros {
 814
 815     $pve_fw_parsed_macros = {};
 816
 817     my $parse = sub {
 818         my ($k, $macro) = @_;
 819         my $lc_name = lc($k);
 820         $pve_fw_macro_ipversion->{$k} = 0;
 821         while (!ref($macro->[0])) {
 822             my $desc = shift @$macro;
 823             if ($desc eq 'ipv4only') {
 824                 $pve_fw_macro_ipversion->{$k} = 4;
 825             } elsif ($desc eq 'ipv6only') {
 826                 $pve_fw_macro_ipversion->{$k} = 6;
 827             } else {
 828                 $pve_fw_macro_descr->{$k} = $desc;
 829             }
 830         }
 831         $pve_fw_preferred_macro_names->{$lc_name} = $k;
 832         $pve_fw_parsed_macros->{$k} = $macro;
 833     };
 834
 835     foreach my $k (keys %$pve_fw_macros) {
 836         &$parse($k, $pve_fw_macros->{$k});
 837     }
 838
 839     foreach my $k (keys %$pve_ipv6fw_macros) {
 840         next if $pve_fw_parsed_macros->{$k};
 841         &$parse($k, $pve_ipv6fw_macros->{$k});
 842         $pve_fw_macro_ipversion->{$k} = 6;
 843     }
 844 }
 845
 846 init_firewall_macros();
 847
 848 sub get_macros {
 849     return wantarray ? ($pve_fw_parsed_macros, $pve_fw_macro_descr): $pve_fw_parsed_macros;
 850 }
 851
 852 my $etc_services;
 853
 854 sub get_etc_services {
 855
 856     return $etc_services if $etc_services;
 857
 858     my $filename = "/etc/services";
 859
 860     my $fh = IO::File->new($filename, O_RDONLY);
 861     if (!$fh) {
 862         warn "unable to read '$filename' - $!\n";
 863         return {};
 864     }
 865
 866     my $services = {};
 867
 868     while (my $line = <$fh>) {
 869         chomp ($line);
 870         next if $line =~m/^#/;
 871         next if ($line =~m/^\s*$/);
 872
 873         if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp|sctp).*$!) {
 874             $services->{byid}->{$2}->{name} = $1;
 875             $services->{byid}->{$2}->{port} = $2;
 876             $services->{byid}->{$2}->{$3} = 1;
 877             $services->{byname}->{$1} = $services->{byid}->{$2};
 878         }
 879     }
 880
 881     close($fh);
 882
 883     $etc_services = $services;
 884
 885
 886     return $etc_services;
 887 }
 888
 889 sub parse_protocol_file {
 890     my ($filename) = @_;
 891
 892     my $fh = IO::File->new($filename, O_RDONLY);
 893     if (!$fh) {
 894         warn "unable to read '$filename' - $!\n";
 895         return {};
 896     }
 897
 898     my $protocols = {};
 899
 900     while (my $line = <$fh>) {
 901         chomp ($line);
 902         next if $line =~m/^#/;
 903         next if ($line =~m/^\s*$/);
 904
 905         if ($line =~ m!^(\S+)\s+(\d+)(?:\s+.*)?$!) {
 906             $protocols->{byid}->{$2}->{name} = $1;
 907             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
 908         }
 909     }
 910
 911     close($fh);
 912
 913     return $protocols;
 914 }
 915
 916 my $etc_protocols;
 917
 918 sub get_etc_protocols {
 919     return $etc_protocols if $etc_protocols;
 920
 921     my $protocols = parse_protocol_file('/etc/protocols');
 922
 923     # add special case for ICMP v6
 924     $protocols->{byid}->{icmpv6}->{name} = "icmpv6";
 925     $protocols->{byname}->{icmpv6} = $protocols->{byid}->{icmpv6};
 926
 927     $etc_protocols = $protocols;
 928
 929     return $etc_protocols;
 930 }
 931
 932 my $etc_ethertypes;
 933
 934 sub get_etc_ethertypes {
 935     $etc_ethertypes = parse_protocol_file('/etc/ethertypes')
 936         if !$etc_ethertypes;
 937     return $etc_ethertypes;
 938 }
 939
 940 my $__local_network;
 941
 942 sub local_network {
 943     my ($new_value) = @_;
 944
 945     $__local_network = $new_value if defined($new_value);
 946
 947     return $__local_network if defined($__local_network);
 948
 949     eval {
 950         my $nodename = PVE::INotify::nodename();
 951
 952         my $ip = PVE::Cluster::remote_node_ip($nodename);
 953
 954         my $testip = Net::IP->new($ip);
 955
 956         my $isv6 = $testip->version == 6;
 957         my $routes = $isv6 ? PVE::ProcFSTools::read_proc_net_ipv6_route()
 958                            : PVE::ProcFSTools::read_proc_net_route();
 959         foreach my $entry (@$routes) {
 960             my $mask;
 961             if ($isv6) {
 962                 $mask = $entry->{prefix};
 963                 next if !$mask; # skip the default route...
 964             } else {
 965                 $mask = $PVE::Network::ipv4_mask_hash_localnet->{$entry->{mask}};
 966                 next if !defined($mask);
 967             }
 968             my $cidr = "$entry->{dest}/$mask";
 969             my $testnet = Net::IP->new($cidr);
 970             my $overlap = $testnet->overlaps($testip);
 971             if ($overlap == $Net::IP::IP_B_IN_A_OVERLAP ||
 972                 $overlap == $Net::IP::IP_IDENTICAL)
 973             {
 974                 $__local_network = $cidr;
 975                 return;
 976             }
 977         }
 978     };
 979     warn $@ if $@;
 980
 981     return $__local_network;
 982 }
 983
 984 # ipset names are limited to 31 characters,
 985 # and we use '-v4' or '-v6' to indicate IP versions,
 986 # and we use '_swap' suffix for atomic update,
 987 # for example PVEFW-${VMID}-${ipset_name}_swap
 988
 989 my $max_iptables_ipset_name_length = 31 - length("PVEFW-") - length("_swap");
 990
 991 sub compute_ipset_chain_name {
 992     my ($vmid, $ipset_name, $ipversion) = @_;
 993
 994     $vmid = 0 if !defined($vmid);
 995
 996     my $id = "$vmid-${ipset_name}-v$ipversion";
 997
 998     if (length($id) > $max_iptables_ipset_name_length) {
 999         $id = PVE::Tools::fnv31a_hex($id);
1000     }
1001
1002     return "PVEFW-$id";
1003 }
1004
1005 sub compute_ipfilter_ipset_name {
1006     my ($iface) = @_;
1007
1008     return "ipfilter-$iface";
1009 }
1010
1011 sub parse_address_list {
1012     my ($str) = @_;
1013
1014     if ($str =~ m/^(\+)(\S+)$/) { # ipset ref
1015         die "ipset name too long\n" if length($str) > ($max_ipset_name_length + 1);
1016         return;
1017     }
1018
1019     if ($str =~ m/^${ip_alias_pattern}$/) {
1020         die "alias name too long\n" if length($str) > $max_alias_name_length;
1021         return;
1022     }
1023
1024     my $count = 0;
1025     my $iprange = 0;
1026     my $ipversion;
1027
1028     my @elements = split(/,/, $str);
1029     die "extraneous commas in list\n" if $str ne join(',', @elements);
1030     foreach my $elem (@elements) {
1031         $count++;
1032         my $ip = Net::IP->new($elem);
1033         if (!$ip) {
1034             my $err = Net::IP::Error();
1035             die "invalid IP address: $err\n";
1036         }
1037         $iprange = 1 if $elem =~ m/-/;
1038
1039         my $new_ipversion = Net::IP::ip_is_ipv6($ip->ip()) ? 6 : 4;
1040
1041         die "detected mixed ipv4/ipv6 addresses in address list '$str'\n"
1042             if $ipversion && ($new_ipversion != $ipversion);
1043
1044         $ipversion = $new_ipversion;
1045     }
1046
1047     die "you can't use a range in a list\n" if $iprange && $count > 1;
1048
1049     return $ipversion;
1050 }
1051
1052 sub parse_port_name_number_or_range {
1053     my ($str, $dport) = @_;
1054
1055     my $services = PVE::Firewall::get_etc_services();
1056     my $count = 0;
1057     my $icmp_port = 0;
1058
1059     my @elements = split(/,/, $str);
1060     die "extraneous commas in list\n" if $str ne join(',', @elements);
1061     foreach my $item (@elements) {
1062         if ($item =~ m/^([0-9]+):([0-9]+)$/) {
1063             $count += 2;
1064             my ($port1, $port2) = ($1, $2);
1065             die "invalid port '$port1'\n" if $port1 > 65535;
1066             die "invalid port '$port2'\n" if $port2 > 65535;
1067             die "backwards range '$port1:$port2' not allowed, did you mean '$port2:$port1'?\n" if $port1 > $port2;
1068         } elsif ($item =~ m/^([0-9]+)$/) {
1069             $count += 1;
1070             my $port = $1;
1071             die "invalid port '$port'\n" if $port > 65535;
1072         } else {
1073             if ($dport && $icmp_type_names->{$item}) {
1074                 $icmp_port = 1;
1075             } elsif ($dport && $icmpv6_type_names->{$item}) {
1076                 $icmp_port = 1;
1077             } else {
1078                 die "invalid port '$item'\n" if !$services->{byname}->{$item};
1079             }
1080         }
1081     }
1082
1083     die "ICPM ports not allowed in port range\n" if $icmp_port && $count > 0;
1084
1085     # I really don't like to use the word number here, but it's the only thing
1086     # that makes sense in a literal way. The range 1:100 counts as 2, not as
1087     # one and not as 100...
1088     die "too many entries in port list (> 15 numbers)\n"
1089         if $count > 15;
1090
1091     return (scalar(@elements) > 1);
1092 }
1093
1094 PVE::JSONSchema::register_format('pve-fw-sport-spec', \&pve_fw_verify_sport_spec);
1095 sub pve_fw_verify_sport_spec {
1096    my ($portstr) = @_;
1097
1098    parse_port_name_number_or_range($portstr, 0);
1099
1100    return $portstr;
1101 }
1102
1103 PVE::JSONSchema::register_format('pve-fw-dport-spec', \&pve_fw_verify_dport_spec);
1104 sub pve_fw_verify_dport_spec {
1105    my ($portstr) = @_;
1106
1107    parse_port_name_number_or_range($portstr, 1);
1108
1109    return $portstr;
1110 }
1111
1112 PVE::JSONSchema::register_format('pve-fw-addr-spec', \&pve_fw_verify_addr_spec);
1113 sub pve_fw_verify_addr_spec {
1114    my ($list) = @_;
1115
1116    parse_address_list($list);
1117
1118    return $list;
1119 }
1120
1121 PVE::JSONSchema::register_format('pve-fw-protocol-spec', \&pve_fw_verify_protocol_spec);
1122 sub pve_fw_verify_protocol_spec {
1123    my ($proto) = @_;
1124
1125    my $protocols = get_etc_protocols();
1126
1127    die "unknown protocol '$proto'\n" if $proto &&
1128        !(defined($protocols->{byname}->{$proto}) ||
1129          defined($protocols->{byid}->{$proto}));
1130
1131    return $proto;
1132 }
1133
1134
1135 # helper function for API
1136
1137 sub copy_opject_with_digest {
1138     my ($object) = @_;
1139
1140     my $sha = Digest::SHA->new('sha1');
1141
1142     my $res = {};
1143     foreach my $k (sort keys %$object) {
1144         my $v = $object->{$k};
1145         next if !defined($v);
1146         $res->{$k} = $v;
1147         $sha->add($k, ':', $v, "\n");
1148     }
1149
1150     my $digest = $sha->hexdigest;
1151
1152     $res->{digest} = $digest;
1153
1154     return wantarray ? ($res, $digest) : $res;
1155 }
1156
1157 sub copy_list_with_digest {
1158     my ($list) = @_;
1159
1160     my $sha = Digest::SHA->new('sha1');
1161
1162     my $res = [];
1163     foreach my $entry (@$list) {
1164         my $data = {};
1165         foreach my $k (sort keys %$entry) {
1166             my $v = $entry->{$k};
1167             next if !defined($v);
1168             $data->{$k} = $v;
1169             # Note: digest ignores refs ($rule->{errors})
1170             # since Digest::SHA expects a series of bytes,
1171             #  we have to encode the value here to prevent errors when
1172             #  using utf8 characters (eg. in comments)
1173             $sha->add($k, ':', encode_utf8($v), "\n") if !ref($v); ;
1174         }
1175         push @$res, $data;
1176     }
1177
1178     my $digest = $sha->hexdigest;
1179
1180     foreach my $entry (@$res) {
1181         $entry->{digest} = $digest;
1182     }
1183
1184     return wantarray ? ($res, $digest) : $res;
1185 }
1186
1187 our $cluster_option_properties = {
1188     enable => {
1189         description => "Enable or disable the firewall cluster wide.",
1190         type => 'integer',
1191         minimum => 0,
1192         optional => 1,
1193     },
1194     ebtables => {
1195         description => "Enable ebtables rules cluster wide.",
1196         type => 'boolean',
1197         default => 1,
1198         optional => 1,
1199     },
1200     policy_in => {
1201         description => "Input policy.",
1202         type => 'string',
1203         optional => 1,
1204         enum => ['ACCEPT', 'REJECT', 'DROP'],
1205     },
1206     policy_out => {
1207         description => "Output policy.",
1208         type => 'string',
1209         optional => 1,
1210         enum => ['ACCEPT', 'REJECT', 'DROP'],
1211     },
1212     log_ratelimit => {
1213         description => "Log ratelimiting settings",
1214         type => 'string', format => {
1215             enable => {
1216                 default_key => 1,
1217                 description => 'Enable or disable log rate limiting',
1218                 type => 'boolean',
1219                 default => '1',
1220             },
1221             rate => {
1222                 type => 'string',
1223                 description => 'Frequency with which the burst bucket gets refilled',
1224                 optional => 1,
1225                 pattern => '[1-9][0-9]*\/(second|minute|hour|day)',
1226                 format_description => 'rate',
1227                 default => '1/second',
1228             },
1229             burst => {
1230                 type => 'integer',
1231                 minimum => 0,
1232                 optional => 1,
1233                 description => 'Inital burst of packages which will get logged',
1234                 default => 5,
1235             },
1236         },
1237         optional => 1,
1238     },
1239 };
1240
1241 our $host_option_properties = {
1242     enable => {
1243         description => "Enable host firewall rules.",
1244         type => 'boolean',
1245         optional => 1,
1246     },
1247     log_level_in =>  get_standard_option('pve-fw-loglevel', {
1248         description => "Log level for incoming traffic." }),
1249     log_level_out =>  get_standard_option('pve-fw-loglevel', {
1250         description => "Log level for outgoing traffic." }),
1251     tcp_flags_log_level =>  get_standard_option('pve-fw-loglevel', {
1252         description => "Log level for illegal tcp flags filter." }),
1253     smurf_log_level =>  get_standard_option('pve-fw-loglevel', {
1254         description => "Log level for SMURFS filter." }),
1255     nosmurfs => {
1256         description => "Enable SMURFS filter.",
1257         type => 'boolean',
1258         optional => 1,
1259     },
1260     tcpflags => {
1261         description => "Filter illegal combinations of TCP flags.",
1262         type => 'boolean',
1263         default => 0,
1264         optional => 1,
1265     },
1266     nf_conntrack_max => {
1267         description => "Maximum number of tracked connections.",
1268         type => 'integer',
1269         optional => 1,
1270         default => 262144,
1271         minimum => 32768,
1272     },
1273     nf_conntrack_tcp_timeout_established => {
1274         description => "Conntrack established timeout.",
1275         type => 'integer',
1276         optional => 1,
1277         default => 432000,
1278         minimum => 7875,
1279     },
1280     nf_conntrack_tcp_timeout_syn_recv => {
1281         description => "Conntrack syn recv timeout.",
1282         type => 'integer',
1283         optional => 1,
1284         default => 60,
1285         minimum => 30,
1286         maximum => 60,
1287     },
1288     ndp => {
1289         description => "Enable NDP (Neighbor Discovery Protocol).",
1290         type => 'boolean',
1291         default => 0,
1292         optional => 1,
1293     },
1294     nf_conntrack_allow_invalid => {
1295         description => "Allow invalid packets on connection tracking.",
1296         type => 'boolean',
1297         default => 0,
1298         optional => 1,
1299     },
1300     protection_synflood => {
1301         description => "Enable synflood protection",
1302         type => 'boolean',
1303         default => 0,
1304         optional => 1,
1305     },
1306     protection_synflood_rate => {
1307         description => "Synflood protection rate syn/sec by ip src.",
1308         type => 'integer',
1309         optional => 1,
1310         default => 200,
1311     },
1312     protection_synflood_burst => {
1313         description => "Synflood protection rate burst by ip src.",
1314         type => 'integer',
1315         optional => 1,
1316         default => 1000,
1317     },
1318     log_nf_conntrack => {
1319         description => "Enable logging of conntrack information.",
1320         type => 'boolean',
1321         default => 0,
1322         optional => 1
1323     },
1324 };
1325
1326 our $vm_option_properties = {
1327     enable => {
1328         description => "Enable/disable firewall rules.",
1329         type => 'boolean',
1330         default => 0,
1331         optional => 1,
1332     },
1333     macfilter => {
1334         description => "Enable/disable MAC address filter.",
1335         type => 'boolean',
1336         default => 0,
1337         optional => 1,
1338     },
1339     dhcp => {
1340         description => "Enable DHCP.",
1341         type => 'boolean',
1342         default => 0,
1343         optional => 1,
1344     },
1345     ndp => {
1346         description => "Enable NDP (Neighbor Discovery Protocol).",
1347         type => 'boolean',
1348         default => 0,
1349         optional => 1,
1350     },
1351     radv => {
1352         description => "Allow sending Router Advertisement.",
1353         type => 'boolean',
1354         optional => 1,
1355     },
1356     ipfilter => {
1357         description => "Enable default IP filters. " .
1358            "This is equivalent to adding an empty ipfilter-net<id> ipset " .
1359            "for every interface. Such ipsets implicitly contain sane default " .
1360            "restrictions such as restricting IPv6 link local addresses to " .
1361            "the one derived from the interface's MAC address. For containers " .
1362            "the configured IP addresses will be implicitly added.",
1363         type => 'boolean',
1364         optional => 1,
1365     },
1366     policy_in => {
1367         description => "Input policy.",
1368         type => 'string',
1369         optional => 1,
1370         enum => ['ACCEPT', 'REJECT', 'DROP'],
1371     },
1372     policy_out => {
1373         description => "Output policy.",
1374         type => 'string',
1375         optional => 1,
1376         enum => ['ACCEPT', 'REJECT', 'DROP'],
1377     },
1378     log_level_in =>  get_standard_option('pve-fw-loglevel', {
1379         description => "Log level for incoming traffic." }),
1380     log_level_out =>  get_standard_option('pve-fw-loglevel', {
1381         description => "Log level for outgoing traffic." }),
1382
1383 };
1384
1385
1386 my $addr_list_descr = "This can refer to a single IP address, an IP set ('+ipsetname') or an IP alias definition. You can also specify an address range like '20.34.101.207-201.3.9.99', or a list of IP addresses and networks (entries are separated by comma). Please do not mix IPv4 and IPv6 addresses inside such lists.";
1387
1388 my $port_descr = "You can use service names or simple numbers (0-65535), as defined in '/etc/services'. Port ranges can be specified with '\\d+:\\d+', for example '80:85', and you can use comma separated list to match several ports or ranges.";
1389
1390 my $rule_properties = {
1391     pos => {
1392         description => "Update rule at position <pos>.",
1393         type => 'integer',
1394         minimum => 0,
1395         optional => 1,
1396     },
1397     digest => get_standard_option('pve-config-digest'),
1398     type => {
1399         description => "Rule type.",
1400         type => 'string',
1401         optional => 1,
1402         enum => ['in', 'out', 'group'],
1403     },
1404     action => {
1405         description => "Rule action ('ACCEPT', 'DROP', 'REJECT') or security group name.",
1406         type => 'string',
1407         optional => 1,
1408         pattern => $security_group_name_pattern,
1409         maxLength => 20,
1410         minLength => 2,
1411     },
1412     macro => {
1413         description => "Use predefined standard macro.",
1414         type => 'string',
1415         optional => 1,
1416         maxLength => 128,
1417     },
1418     iface => get_standard_option('pve-iface', {
1419         description => "Network interface name. You have to use network configuration key names for VMs and containers ('net\\d+'). Host related rules can use arbitrary strings.",
1420         optional => 1
1421     }),
1422     source => {
1423         description => "Restrict packet source address. $addr_list_descr",
1424         type => 'string', format => 'pve-fw-addr-spec',
1425         optional => 1,
1426     },
1427     dest => {
1428         description => "Restrict packet destination address. $addr_list_descr",
1429         type => 'string', format => 'pve-fw-addr-spec',
1430         optional => 1,
1431     },
1432     proto => {
1433         description => "IP protocol. You can use protocol names ('tcp'/'udp') or simple numbers, as defined in '/etc/protocols'.",
1434         type => 'string', format => 'pve-fw-protocol-spec',
1435         optional => 1,
1436     },
1437     enable => {
1438         description => "Flag to enable/disable a rule.",
1439         type => 'integer',
1440         minimum => 0,
1441         optional => 1,
1442     },
1443     log => get_standard_option('pve-fw-loglevel', {
1444         description => "Log level for firewall rule.",
1445     }),
1446     sport => {
1447         description => "Restrict TCP/UDP source port. $port_descr",
1448         type => 'string', format => 'pve-fw-sport-spec',
1449         optional => 1,
1450     },
1451     dport => {
1452         description => "Restrict TCP/UDP destination port. $port_descr",
1453         type => 'string', format => 'pve-fw-dport-spec',
1454         optional => 1,
1455     },
1456     comment => {
1457         description => "Descriptive comment.",
1458         type => 'string',
1459         optional => 1,
1460     },
1461 };
1462
1463 sub add_rule_properties {
1464     my ($properties) = @_;
1465
1466     foreach my $k (keys %$rule_properties) {
1467         my $h = $rule_properties->{$k};
1468         # copy data, so that we can modify later without side effects
1469         foreach my $opt (keys %$h) { $properties->{$k}->{$opt} = $h->{$opt}; }
1470     }
1471
1472     return $properties;
1473 }
1474
1475 sub delete_rule_properties {
1476     my ($rule, $delete_str) = @_;
1477
1478     foreach my $opt (PVE::Tools::split_list($delete_str)) {
1479         raise_param_exc({ 'delete' => "no such property ('$opt')"})
1480             if !defined($rule_properties->{$opt});
1481         raise_param_exc({ 'delete' => "unable to delete required property '$opt'"})
1482             if $opt eq 'type' || $opt eq 'action';
1483         delete $rule->{$opt};
1484     }
1485
1486     return $rule;
1487 }
1488
1489 my $apply_macro = sub {
1490     my ($macro_name, $param, $verify, $ipversion) = @_;
1491
1492     my $macro_rules = $pve_fw_parsed_macros->{$macro_name};
1493     die "unknown macro '$macro_name'\n" if !$macro_rules; # should not happen
1494
1495     if ($ipversion && ($ipversion == 6) && $pve_ipv6fw_macros->{$macro_name}) {
1496         $macro_rules = $pve_ipv6fw_macros->{$macro_name};
1497     }
1498
1499     # skip macros which are specific to another ipversion
1500     if ($ipversion && (my $required = $pve_fw_macro_ipversion->{$macro_name})) {
1501         return if $ipversion != $required;
1502     }
1503
1504     my $rules = [];
1505
1506     foreach my $templ (@$macro_rules) {
1507         my $rule = {};
1508         my $param_used = {};
1509         foreach my $k (keys %$templ) {
1510             my $v = $templ->{$k};
1511             if ($v eq 'PARAM') {
1512                 $v = $param->{$k};
1513                 $param_used->{$k} = 1;
1514             } elsif ($v eq 'DEST') {
1515                 $v = $param->{dest};
1516                 $param_used->{dest} = 1;
1517             } elsif ($v eq 'SOURCE') {
1518                 $v = $param->{source};
1519                 $param_used->{source} = 1;
1520             }
1521
1522             if (!defined($v)) {
1523                 my $msg = "missing parameter '$k' in macro '$macro_name'";
1524                 raise_param_exc({ macro => $msg }) if $verify;
1525                 die "$msg\n";
1526             }
1527             $rule->{$k} = $v;
1528         }
1529         foreach my $k (keys %$param) {
1530             next if $k eq 'macro';
1531             next if !defined($param->{$k});
1532             next if $param_used->{$k};
1533             if (defined($rule->{$k})) {
1534                 if ($rule->{$k} ne $param->{$k}) {
1535                     my $msg = "parameter '$k' already define in macro (value = '$rule->{$k}')";
1536                     raise_param_exc({ $k => $msg }) if $verify;
1537                     die "$msg\n";
1538                 }
1539             } else {
1540                 $rule->{$k} = $param->{$k};
1541             }
1542         }
1543         push @$rules, $rule;
1544     }
1545
1546     return $rules;
1547 };
1548
1549 my $rule_env_iface_lookup = {
1550     'ct' => 1,
1551     'vm' => 1,
1552     'group' => 0,
1553     'cluster' => 1,
1554     'host' => 1,
1555 };
1556
1557 sub verify_rule {
1558     my ($rule, $cluster_conf, $fw_conf, $rule_env, $noerr) = @_;
1559
1560     my $allow_groups = $rule_env eq 'group' ? 0 : 1;
1561
1562     my $allow_iface = $rule_env_iface_lookup->{$rule_env};
1563     die "unknown rule_env '$rule_env'\n" if !defined($allow_iface); # should not happen
1564
1565     my $errors = $rule->{errors} || {};
1566
1567     my $error_count = 0;
1568
1569     my $add_error = sub {
1570         my ($param, $msg)  = @_;
1571         chomp $msg;
1572         raise_param_exc({ $param => $msg }) if !$noerr;
1573         $error_count++;
1574         $errors->{$param} = $msg if !$errors->{$param};
1575     };
1576
1577     my $ipversion;
1578     my $set_ip_version = sub {
1579         my $vers = shift;
1580         if ($vers) {
1581             die "detected mixed ipv4/ipv6 adresses in rule\n"
1582                 if $ipversion && ($vers != $ipversion);
1583             $ipversion = $vers;
1584         }
1585     };
1586
1587     my $check_ipset_or_alias_property = sub {
1588         my ($name, $expected_ipversion) = @_;
1589
1590         if (my $value = $rule->{$name}) {
1591             if ($value =~ m/^\+/) {
1592                 if ($value =~ m/^\+(${ipset_name_pattern})$/) {
1593                     &$add_error($name, "no such ipset '$1'")
1594                         if !($cluster_conf->{ipset}->{$1} || ($fw_conf && $fw_conf->{ipset}->{$1}));
1595
1596                 } else {
1597                     &$add_error($name, "invalid ipset name '$value'");
1598                 }
1599             } elsif ($value =~ m/^${ip_alias_pattern}$/){
1600                 my $alias = lc($value);
1601                 &$add_error($name, "no such alias '$value'")
1602                     if !($cluster_conf->{aliases}->{$alias} || ($fw_conf && $fw_conf->{aliases}->{$alias}));
1603                 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1604                 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1605
1606                 &$set_ip_version($e->{ipversion});
1607             }
1608         }
1609     };
1610
1611     my $type = $rule->{type};
1612     my $action = $rule->{action};
1613
1614     &$add_error('type', "missing property") if !$type;
1615     &$add_error('action', "missing property") if !$action;
1616
1617     if ($type) {
1618         if ($type eq  'in' || $type eq 'out') {
1619             &$add_error('action', "unknown action '$action'")
1620                 if $action && ($action !~ m/^(ACCEPT|DROP|REJECT)$/);
1621         } elsif ($type eq 'group') {
1622             &$add_error('type', "security groups not allowed")
1623                 if !$allow_groups;
1624             &$add_error('action', "invalid characters in security group name")
1625                 if $action && ($action !~ m/^${security_group_name_pattern}$/);
1626         } else {
1627             &$add_error('type', "unknown rule type '$type'");
1628         }
1629     }
1630
1631     if ($rule->{iface}) {
1632         &$add_error('type', "parameter -i not allowed for this rule type")
1633             if !$allow_iface;
1634         eval { PVE::JSONSchema::pve_verify_iface($rule->{iface}); };
1635         &$add_error('iface', $@) if $@;
1636         if ($rule_env eq 'vm' || $rule_env eq 'ct') {
1637             &$add_error('iface', "value does not match the regex pattern 'net\\d+'")
1638                 if $rule->{iface} !~  m/^net(\d+)$/;
1639         }
1640     }
1641
1642     if ($rule->{macro}) {
1643         if (my $preferred_name = $pve_fw_preferred_macro_names->{lc($rule->{macro})}) {
1644             $rule->{macro} = $preferred_name;
1645         } else {
1646             &$add_error('macro', "unknown macro '$rule->{macro}'");
1647         }
1648     }
1649
1650     if ($rule->{proto}) {
1651         eval { pve_fw_verify_protocol_spec($rule->{proto}); };
1652         &$add_error('proto', $@) if $@;
1653         &$set_ip_version(4) if $rule->{proto} eq 'icmp';
1654         &$set_ip_version(6) if $rule->{proto} eq 'icmpv6';
1655     }
1656
1657     if ($rule->{dport}) {
1658         eval { parse_port_name_number_or_range($rule->{dport}, 1); };
1659         &$add_error('dport', $@) if $@;
1660         my $proto = $rule->{proto};
1661         &$add_error('proto', "missing property - 'dport' requires this property")
1662             if !$proto;
1663         &$add_error('dport', "protocol '$proto' does not support ports")
1664             if !$PROTOCOLS_WITH_PORTS->{$proto} &&
1665                 $proto ne 'icmp' && $proto ne 'icmpv6'; # special cases
1666     }
1667
1668     if ($rule->{sport}) {
1669         eval { parse_port_name_number_or_range($rule->{sport}, 0); };
1670         &$add_error('sport', $@) if $@;
1671         my $proto = $rule->{proto};
1672         &$add_error('proto', "missing property - 'sport' requires this property")
1673             if !$proto;
1674         &$add_error('sport', "protocol '$proto' does not support ports")
1675             if !$PROTOCOLS_WITH_PORTS->{$proto};
1676     }
1677
1678     if ($rule->{source}) {
1679         eval {
1680             my $source_ipversion = parse_address_list($rule->{source});
1681             &$set_ip_version($source_ipversion);
1682         };
1683         &$add_error('source', $@) if $@;
1684         &$check_ipset_or_alias_property('source', $ipversion);
1685     }
1686
1687     if ($rule->{dest}) {
1688         eval {
1689             my $dest_ipversion = parse_address_list($rule->{dest});
1690             &$set_ip_version($dest_ipversion);
1691         };
1692         &$add_error('dest', $@) if $@;
1693         &$check_ipset_or_alias_property('dest', $ipversion);
1694     }
1695
1696     $rule->{ipversion} = $ipversion if $ipversion;
1697
1698     if ($rule->{macro} && !$error_count) {
1699         eval { &$apply_macro($rule->{macro}, $rule, 1, $ipversion); };
1700         if (my $err = $@) {
1701             if (ref($err) eq "PVE::Exception" && $err->{errors}) {
1702                 my $eh = $err->{errors};
1703                 foreach my $p (keys %$eh) {
1704                     &$add_error($p, $eh->{$p});
1705                 }
1706             } else {
1707                 &$add_error('macro', "$err");
1708             }
1709         }
1710     }
1711
1712     $rule->{errors} = $errors if $error_count;
1713
1714     return $rule;
1715 }
1716
1717 sub copy_rule_data {
1718     my ($rule, $param) = @_;
1719
1720     foreach my $k (keys %$rule_properties) {
1721         if (defined(my $v = $param->{$k})) {
1722             if ($v eq '' || $v eq '-') {
1723                 delete $rule->{$k};
1724             } else {
1725                 $rule->{$k} = $v;
1726             }
1727         }
1728     }
1729
1730     return $rule;
1731 }
1732
1733 sub rules_modify_permissions {
1734     my ($rule_env) = @_;
1735
1736     if ($rule_env eq 'host') {
1737         return {
1738             check => ['perm', '/nodes/{node}', [ 'Sys.Modify' ]],
1739         };
1740     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1741         return {
1742             check => ['perm', '/', [ 'Sys.Modify' ]],
1743         };
1744     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1745         return {
1746             check => ['perm', '/vms/{vmid}', [ 'VM.Config.Network' ]],
1747         }
1748     }
1749
1750     return undef;
1751 }
1752
1753 sub rules_audit_permissions {
1754     my ($rule_env) = @_;
1755
1756     if ($rule_env eq 'host') {
1757         return {
1758             check => ['perm', '/nodes/{node}', [ 'Sys.Audit' ]],
1759         };
1760     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1761         return {
1762             check => ['perm', '/', [ 'Sys.Audit' ]],
1763         };
1764     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1765         return {
1766             check => ['perm', '/vms/{vmid}', [ 'VM.Audit' ]],
1767         }
1768     }
1769
1770     return undef;
1771 }
1772
1773 # core functions
1774 my $bridge_firewall_enabled = 0;
1775
1776 sub enable_bridge_firewall {
1777
1778     return if $bridge_firewall_enabled; # only once
1779
1780     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
1781     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
1782
1783     # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
1784     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
1785
1786     $bridge_firewall_enabled = 1;
1787 }
1788
1789 sub iptables_restore_cmdlist {
1790     my ($cmdlist, $table) = @_;
1791
1792     $table = 'filter' if !$table;
1793     run_command(['iptables-restore', '-T', $table, '-n'], input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1794 }
1795
1796 sub ip6tables_restore_cmdlist {
1797     my ($cmdlist, $table) = @_;
1798
1799     $table = 'filter' if !$table;
1800     run_command(['ip6tables-restore', '-T', $table, '-n'], input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1801 }
1802
1803 sub ipset_restore_cmdlist {
1804     my ($cmdlist) = @_;
1805
1806     run_command(['ipset', 'restore'], input => $cmdlist, errmsg => "ipset_restore_cmdlist");
1807 }
1808
1809 sub ebtables_restore_cmdlist {
1810     my ($cmdlist) = @_;
1811
1812     run_command(['ebtables-restore'], input => $cmdlist, errmsg => "ebtables_restore_cmdlist");
1813 }
1814
1815 sub iptables_get_chains {
1816     my ($iptablescmd, $t) = @_;
1817
1818     $iptablescmd = "iptables" if !$iptablescmd;
1819     $t = 'filter' if !$t;
1820
1821     my $res = {};
1822
1823     # check what chains we want to track
1824     my $is_pvefw_chain = sub {
1825         my $name = shift;
1826
1827         return 1 if $name =~ m/^PVEFW-\S+$/;
1828
1829         return 1 if $name =~ m/^tap\d+i\d+-(?:IN|OUT)$/;
1830
1831         return 1 if $name =~ m/^veth\d+i\d+-(?:IN|OUT)$/;
1832
1833         return 1 if $name =~ m/^fwbr\d+(v\d+)?-(?:FW|IN|OUT|IPS)$/;
1834         return 1 if $name =~ m/^GROUP-(?:$security_group_name_pattern)-(?:IN|OUT)$/;
1835
1836         return undef;
1837     };
1838
1839     my $table = '';
1840
1841     my $hooks = {};
1842
1843     my $parser = sub {
1844         my $line = shift;
1845
1846         return if $line =~ m/^#/;
1847         return if $line =~ m/^\s*$/;
1848
1849         if ($line =~ m/^\*(\S+)$/) {
1850             $table = $1;
1851             return;
1852         }
1853
1854         return if $table ne $t;
1855
1856         if ($line =~ m/^:(\S+)\s/) {
1857             my $chain = $1;
1858             return if !&$is_pvefw_chain($chain);
1859             $res->{$chain} = "unknown";
1860         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
1861             my ($chain, $sig) = ($1, $2);
1862             return if !&$is_pvefw_chain($chain);
1863             $res->{$chain} = $sig;
1864         } elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD|PREROUTING)\s+-j\s+PVEFW-\1$/) {
1865             $hooks->{$1} = 1;
1866         } else {
1867             # simply ignore the rest
1868             return;
1869         }
1870     };
1871
1872     run_command(["$iptablescmd-save"], outfunc => $parser);
1873
1874     return wantarray ? ($res, $hooks) : $res;
1875 }
1876
1877 sub iptables_chain_digest {
1878     my ($rules) = @_;
1879     my $digest = Digest::SHA->new('sha1');
1880     foreach my $rule (@$rules) { # order is important
1881         $digest->add($rule);
1882     }
1883     return $digest->b64digest;
1884 }
1885
1886 sub ipset_chain_digest {
1887     my ($rules) = @_;
1888
1889     my $digest = Digest::SHA->new('sha1');
1890     foreach my $rule (sort @$rules) { # note: sorted
1891         $digest->add($rule);
1892     }
1893     return $digest->b64digest;
1894 }
1895
1896 sub ipset_get_chains {
1897
1898     my $res = {};
1899     my $chains = {};
1900
1901     my $parser = sub {
1902         my $line = shift;
1903
1904         return if $line =~ m/^#/;
1905         return if $line =~ m/^\s*$/;
1906         if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
1907             my $chain = $1;
1908             $line =~ s/\s+$//; # delete trailing white space
1909             push @{$chains->{$chain}}, $line;
1910         } else {
1911             # simply ignore the rest
1912             return;
1913         }
1914     };
1915
1916     run_command(['ipset', 'save'], outfunc => $parser);
1917
1918     # compute digest for each chain
1919     foreach my $chain (keys %$chains) {
1920         $res->{$chain} = ipset_chain_digest($chains->{$chain});
1921     }
1922
1923     return $res;
1924 }
1925
1926 sub ebtables_get_chains {
1927
1928     my $res = {};
1929     my $chains = {};
1930     my $parser = sub {
1931         my $line = shift;
1932         return if $line =~ m/^#/;
1933         return if $line =~ m/^\s*$/;
1934         if ($line =~ m/^:(\S+)\s\S+$/) {
1935             # Make sure we know chains exist even if they're empty.
1936             $chains->{$1} //= [];
1937         } elsif ($line =~ m/^(?:\S+)\s(\S+)\s(?:\S+).*/) {
1938             my $chain = $1;
1939             $line =~ s/\s+$//;
1940             push @{$chains->{$chain}}, $line;
1941         } else {
1942             # simply ignore the rest
1943             return;
1944         }
1945     };
1946
1947     run_command(['ebtables-save'], outfunc => $parser);
1948     # compute digest for each chain and store rules as well
1949     foreach my $chain (keys %$chains) {
1950         $res->{$chain}->{rules} = $chains->{$chain};
1951         $res->{$chain}->{sig} = iptables_chain_digest($chains->{$chain});
1952     }
1953     return $res;
1954 }
1955
1956 # substitude action of rule according to action hash
1957 sub rule_substitude_action {
1958     my ($rule, $actions) = @_;
1959
1960     if (my $action = $rule->{action}) {
1961         $rule->{action} = $actions->{$action} if defined($actions->{$action});
1962     }
1963 }
1964
1965 # generate a src or dst match
1966 # $dir(ection) is either d or s
1967 sub ipt_gen_src_or_dst_match {
1968     my ($adr, $dir, $ipversion, $cluster_conf, $fw_conf) = @_;
1969
1970     my $srcdst;
1971     if ($dir eq 's') {
1972         $srcdst = "src";
1973     } elsif ($dir eq 'd') {
1974         $srcdst = "dst";
1975     } else {
1976         die "ipt_gen_src_or_dst_match: invalid direction $dir \n";
1977     }
1978
1979     my $match;
1980     if ($adr =~ m/^\+/) {
1981         if ($adr =~ m/^\+(${ipset_name_pattern})$/) {
1982             my $name = $1;
1983             my $ipset_chain;
1984             if ($fw_conf && $fw_conf->{ipset}->{$name}) {
1985                 $ipset_chain = compute_ipset_chain_name($fw_conf->{vmid}, $name, $ipversion);
1986             } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
1987                 $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
1988             } else {
1989                 die "no such ipset '$name'\n";
1990             }
1991             $match = "-m set --match-set ${ipset_chain} ${srcdst}";
1992         } else {
1993             die "invalid security group name '$adr'\n";
1994         }
1995     } elsif ($adr =~ m/^${ip_alias_pattern}$/){
1996         my $alias = lc($adr);
1997         my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1998         $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1999         die "no such alias '$adr'\n" if !$e;
2000         $match = "-${dir} $e->{cidr}";
2001     } elsif ($adr =~ m/\-/){
2002         $match = "-m iprange --${srcdst}-range $adr";
2003     } else {
2004         $match = "-${dir} $adr";
2005     }
2006
2007     return $match;
2008 }
2009
2010 # convert a %rule to an array of iptables commands
2011 sub ipt_rule_to_cmds {
2012     my ($rule, $chain, $ipversion, $cluster_conf, $fw_conf, $vmid) = @_;
2013
2014     die "ipt_rule_to_cmds unable to handle macro" if $rule->{macro}; #should not happen
2015
2016     my @match = ();
2017
2018     if (defined $rule->{match}) {
2019         push @match, $rule->{match};
2020     } else {
2021         push @match, "-i $rule->{iface_in}" if $rule->{iface_in};
2022         push @match, "-o $rule->{iface_out}" if $rule->{iface_out};
2023
2024         if ($rule->{source}) {
2025             push @match, ipt_gen_src_or_dst_match($rule->{source}, 's', $ipversion, $cluster_conf, $fw_conf);
2026         }
2027         if ($rule->{dest}) {
2028             push @match, ipt_gen_src_or_dst_match($rule->{dest}, 'd', $ipversion, $cluster_conf, $fw_conf);
2029         }
2030
2031         if (my $proto = $rule->{proto}) {
2032             push @match, "-p $proto";
2033
2034             my $multidport = defined($rule->{dport}) && parse_port_name_number_or_range($rule->{dport}, 1);
2035             my $multisport = defined($rule->{sport}) && parse_port_name_number_or_range($rule->{sport}, 0);
2036
2037             my $add_dport = sub {
2038                 return if !$rule->{dport};
2039
2040                 if ($proto eq 'icmp') {
2041                     # Note: we use dport to store --icmp-type
2042                     die "unknown icmp-type '$rule->{dport}'\n"
2043                         if $rule->{dport} !~ /^\d+$/ && !defined($icmp_type_names->{$rule->{dport}});
2044                     push @match, "-m icmp --icmp-type $rule->{dport}";
2045                 } elsif ($proto eq 'icmpv6') {
2046                     # Note: we use dport to store --icmpv6-type
2047                     die "unknown icmpv6-type '$rule->{dport}'\n"
2048                         if $rule->{dport} !~ /^\d+$/ && !defined($icmpv6_type_names->{$rule->{dport}});
2049                     push @match, "-m icmpv6 --icmpv6-type $rule->{dport}";
2050                 } elsif (!$PROTOCOLS_WITH_PORTS->{$proto}) {
2051                     die "protocol $proto does not have ports\n";
2052                 } elsif ($multidport) {
2053                     push @match, "--match multiport", "--dports $rule->{dport}";
2054                 } else {
2055                     push @match, "--dport $rule->{dport}";
2056                 }
2057             };
2058
2059             my $add_sport = sub {
2060                 return if !$rule->{sport};
2061
2062                 die "protocol $proto does not have ports\n"
2063                     if !$PROTOCOLS_WITH_PORTS->{$proto};
2064                 if ($multisport) {
2065                     push @match, "--match multiport", "--sports $rule->{sport}";
2066                 } else {
2067                     push @match, "--sport $rule->{sport}";
2068                 }
2069             };
2070
2071             # order matters - single port before multiport!
2072             $add_dport->() if $multisport;
2073             $add_sport->();
2074             $add_dport->() if !$multisport;
2075         } elsif ($rule->{dport} || $rule->{sport}) {
2076             die "destination port '$rule->{dport}', but no protocol specified\n" if $rule->{dport};
2077             die "source port '$rule->{sport}', but no protocol specified\n" if $rule->{sport};
2078         }
2079
2080         push @match, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
2081     }
2082     my $matchstr = scalar(@match) ? join(' ', @match) : "";
2083
2084     my $targetstr;
2085     if (defined $rule->{target}) {
2086         $targetstr = $rule->{target};
2087     } else {
2088         my $action = (defined $rule->{action}) ? $rule->{action} : "";
2089         my $goto = 1 if $action eq 'PVEFW-SET-ACCEPT-MARK';
2090         $targetstr = ($goto) ? "-g $action" : "-j $action";
2091     }
2092
2093     my @iptcmds;
2094     my $log = $rule->{log};
2095     if (defined($log) && $log ne 'nolog') {
2096         my $loglevel = $log_level_hash->{$log};
2097         my $logaction = get_log_rule_base($chain, $vmid, $rule->{logmsg}, $loglevel);
2098         push @iptcmds, "-A $chain $matchstr $logaction";
2099     }
2100     push @iptcmds, "-A $chain $matchstr $targetstr";
2101     return @iptcmds;
2102 }
2103
2104 sub ruleset_generate_rule {
2105     my ($ruleset, $chain, $ipversion, $rule, $cluster_conf, $fw_conf, $vmid) = @_;
2106
2107     my $rules;
2108
2109     if ($rule->{macro}) {
2110         $rules = &$apply_macro($rule->{macro}, $rule, 0, $ipversion);
2111     } else {
2112         $rules = [ $rule ];
2113     }
2114
2115     # update all or nothing
2116     my @ipt_rule_cmds;
2117     foreach my $r (@$rules) {
2118         push @ipt_rule_cmds, ipt_rule_to_cmds($r, $chain, $ipversion, $cluster_conf, $fw_conf, $vmid);
2119     }
2120     foreach my $c (@ipt_rule_cmds) {
2121         ruleset_add_ipt_cmd($ruleset, $chain, $c);
2122     }
2123 }
2124
2125 sub ruleset_create_chain {
2126     my ($ruleset, $chain) = @_;
2127
2128     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
2129     die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
2130
2131     die "chain '$chain' already exists\n" if $ruleset->{$chain};
2132
2133     $ruleset->{$chain} = [];
2134 }
2135
2136 sub ruleset_chain_exist {
2137     my ($ruleset, $chain) = @_;
2138
2139     return $ruleset->{$chain} ? 1 : undef;
2140 }
2141
2142 # add an iptables command (like generated by ipt_rule_to_cmds) to a chain
2143 sub ruleset_add_ipt_cmd {
2144    my ($ruleset, $chain, $iptcmd) = @_;
2145
2146    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2147
2148    push @{$ruleset->{$chain}}, $iptcmd;
2149 }
2150
2151 sub ruleset_addrule {
2152     my ($ruleset, $chain, $match, $action, $log, $logmsg, $vmid) = @_;
2153
2154     die "no such chain '$chain'\n" if !$ruleset->{$chain};
2155
2156     if ($log) {
2157         my $loglevel = $log_level_hash->{$log};
2158         my $logaction = get_log_rule_base($chain, $vmid, $logmsg, $loglevel);
2159         push @{$ruleset->{$chain}}, "-A $chain $match $logaction";
2160     }
2161     # for stable ebtables digests avoid double-spaces to match ebtables-save output
2162     $match .= ' ' if length($match);
2163     push @{$ruleset->{$chain}}, "-A $chain ${match}$action";
2164 }
2165
2166 sub ruleset_insertrule {
2167    my ($ruleset, $chain, $match, $action, $log) = @_;
2168
2169    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2170
2171    unshift @{$ruleset->{$chain}}, "-A $chain $match $action";
2172 }
2173
2174 sub get_log_rule_base {
2175     my ($chain, $vmid, $msg, $loglevel) = @_;
2176
2177     $vmid = 0 if !defined($vmid);
2178     $msg = "" if !defined($msg);
2179
2180     my $rlimit = '';
2181     if (defined($global_log_ratelimit)) {
2182         $rlimit = "-m limit $global_log_ratelimit ";
2183     }
2184
2185     # Note: we use special format for prefix to pass further
2186     # info to log daemon (VMID, LOGLEVEL and CHAIN)
2187     return "${rlimit}-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
2188 }
2189
2190 sub ruleset_add_chain_policy {
2191     my ($ruleset, $chain, $ipversion, $vmid, $policy, $loglevel, $accept_action) = @_;
2192
2193     if ($policy eq 'ACCEPT') {
2194
2195         my $rule = { action => 'ACCEPT' };
2196         rule_substitude_action($rule, { ACCEPT =>  $accept_action});
2197         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule);
2198
2199     } elsif ($policy eq 'DROP') {
2200
2201         ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Drop");
2202
2203         ruleset_addrule($ruleset, $chain, "", "-j DROP", $loglevel, "policy $policy: ", $vmid);
2204     } elsif ($policy eq 'REJECT') {
2205         ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Reject");
2206
2207         ruleset_addrule($ruleset, $chain, "", "-g PVEFW-reject", $loglevel, "policy $policy: ", $vmid);
2208     } else {
2209         # should not happen
2210         die "internal error: unknown policy '$policy'";
2211     }
2212 }
2213
2214 sub ruleset_chain_add_ndp {
2215     my ($ruleset, $chain, $ipversion, $options, $direction, $accept) = @_;
2216     return if $ipversion != 6 || (defined($options->{ndp}) && !$options->{ndp});
2217
2218     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-solicitation", $accept);
2219     if ($direction ne 'OUT' || $options->{radv}) {
2220         ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", $accept);
2221     }
2222     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-solicitation", $accept);
2223     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-advertisement", $accept);
2224 }
2225
2226 sub ruleset_chain_add_conn_filters {
2227     my ($ruleset, $chain, $allow_invalid, $accept) = @_;
2228
2229     if (!$allow_invalid) {
2230         ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID", "-j DROP");
2231     }
2232     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED", "-j $accept");
2233 }
2234
2235 sub ruleset_chain_add_input_filters {
2236     my ($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel) = @_;
2237
2238     if ($cluster_conf->{ipset}->{blacklist}){
2239         if (!ruleset_chain_exist($ruleset, "PVEFW-blacklist")) {
2240             ruleset_create_chain($ruleset, "PVEFW-blacklist");
2241             ruleset_addrule($ruleset, "PVEFW-blacklist", "", "-j DROP", $loglevel, "DROP: ", 0);
2242         }
2243         my $ipset_chain = compute_ipset_chain_name(0, 'blacklist', $ipversion);
2244         ruleset_addrule($ruleset, $chain, "-m set --match-set ${ipset_chain} src", "-j PVEFW-blacklist");
2245     }
2246
2247     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
2248         if ($ipversion == 4) {
2249             ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW", "-j PVEFW-smurfs");
2250         }
2251     }
2252
2253     if ($options->{tcpflags}) {
2254         ruleset_addrule($ruleset, $chain, "-p tcp", "-j PVEFW-tcpflags");
2255     }
2256 }
2257
2258 sub ruleset_create_vm_chain {
2259     my ($ruleset, $chain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction) = @_;
2260
2261     ruleset_create_chain($ruleset, $chain);
2262     my $accept = generate_nfqueue($options);
2263
2264     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
2265         if ($ipversion == 4) {
2266             if ($direction eq 'OUT') {
2267                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2268                                       { action => 'PVEFW-SET-ACCEPT-MARK',
2269                                         proto => 'udp', sport => 68, dport => 67 });
2270             } else {
2271                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2272                                       { action => 'ACCEPT',
2273                                         proto => 'udp', sport => 67, dport => 68 });
2274             }
2275         } elsif ($ipversion == 6) {
2276             if ($direction eq 'OUT') {
2277                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2278                                       { action => 'PVEFW-SET-ACCEPT-MARK',
2279                                         proto => 'udp', sport => 546, dport => 547 });
2280             } else {
2281                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2282                                       { action => 'ACCEPT',
2283                                         proto => 'udp', sport => 547, dport => 546 });
2284             }
2285         }
2286
2287     }
2288
2289     if ($direction eq 'OUT') {
2290         if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
2291             ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr", "-j DROP");
2292         }
2293         if ($ipversion == 6 && !$options->{radv}) {
2294             ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", "-j DROP");
2295         }
2296         if ($ipfilter_ipset) {
2297             ruleset_addrule($ruleset, $chain, "-m set ! --match-set $ipfilter_ipset src", "-j DROP");
2298         }
2299         ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2300     }
2301
2302     my $accept_action = $direction eq 'OUT' ? '-g PVEFW-SET-ACCEPT-MARK' : "-j $accept";
2303     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, $direction, $accept_action);
2304 }
2305
2306 sub ruleset_add_group_rule {
2307     my ($ruleset, $cluster_conf, $chain, $rule, $direction, $action, $ipversion) = @_;
2308
2309     my $group = $rule->{action};
2310     my $group_chain = "GROUP-$group-$direction";
2311     if(!ruleset_chain_exist($ruleset, $group_chain)){
2312         generate_group_rules($ruleset, $cluster_conf, $group, $ipversion);
2313     }
2314
2315     if ($direction eq 'OUT' && $rule->{iface_out}) {
2316         ruleset_addrule($ruleset, $chain, "-o $rule->{iface_out}", "-j $group_chain");
2317     } elsif ($direction eq 'IN' && $rule->{iface_in}) {
2318         ruleset_addrule($ruleset, $chain, "-i $rule->{iface_in}", "-j $group_chain");
2319     } else {
2320         ruleset_addrule($ruleset, $chain, "", "-j $group_chain");
2321     }
2322
2323     ruleset_addrule($ruleset, $chain, "-m mark --mark $FWACCEPTMARK_ON", "-j $action");
2324 }
2325
2326 sub ruleset_generate_vm_rules {
2327     my ($ruleset, $rules, $cluster_conf, $vmfw_conf, $chain, $netid, $direction, $options, $ipversion, $vmid) = @_;
2328
2329     my $lc_direction = lc($direction);
2330
2331     my $in_accept = generate_nfqueue($options);
2332
2333     foreach my $rule (@$rules) {
2334         next if $rule->{iface} && $rule->{iface} ne $netid;
2335         next if !$rule->{enable} || $rule->{errors};
2336         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2337
2338         if ($rule->{type} eq 'group') {
2339             ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, $direction,
2340                                    $direction eq 'OUT' ? 'RETURN' : $in_accept, $ipversion);
2341         } else {
2342             next if $rule->{type} ne $lc_direction;
2343             eval {
2344                 $rule->{logmsg} = "$rule->{action}: ";
2345                 if ($direction eq 'OUT') {
2346                     rule_substitude_action($rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
2347                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $vmfw_conf, $vmid);
2348                 } else {
2349                     rule_substitude_action($rule, { ACCEPT => $in_accept , REJECT => "PVEFW-reject" });
2350                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $vmfw_conf, $vmid);
2351                 }
2352             };
2353             warn $@ if $@;
2354         }
2355     }
2356 }
2357
2358 sub generate_nfqueue {
2359     my ($options) = @_;
2360
2361     if ($options->{ips}) {
2362         my $action = "NFQUEUE";
2363         if ($options->{ips_queues} && $options->{ips_queues} =~ m/^(\d+)(:(\d+))?$/) {
2364             if (defined($3) && defined($1)) {
2365                 $action .= " --queue-balance $1:$3";
2366             } elsif (defined($1)) {
2367                 $action .= " --queue-num $1";
2368             }
2369         }
2370         $action .= " --queue-bypass" if $feature_ipset_nomatch; #need kernel 3.10
2371         return $action;
2372     } else {
2373         return "ACCEPT";
2374     }
2375 }
2376
2377 sub ruleset_generate_vm_ipsrules {
2378     my ($ruleset, $options, $direction, $iface) = @_;
2379
2380     if ($options->{ips} && $direction eq 'IN') {
2381         my $nfqueue = generate_nfqueue($options);
2382
2383         if (!ruleset_chain_exist($ruleset, "PVEFW-IPS")) {
2384             ruleset_create_chain($ruleset, "PVEFW-IPS");
2385         }
2386
2387         ruleset_addrule($ruleset, "PVEFW-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged", "-j $nfqueue");
2388     }
2389 }
2390
2391 sub generate_tap_rules_direction {
2392     my ($ruleset, $cluster_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $direction, $ipversion) = @_;
2393
2394     my $lc_direction = lc($direction);
2395
2396     my $rules = $vmfw_conf->{rules};
2397
2398     my $options = $vmfw_conf->{options};
2399     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
2400
2401     my $tapchain = "$iface-$direction";
2402
2403     my $ipfilter_name = compute_ipfilter_ipset_name($netid);
2404     my $ipfilter_ipset = compute_ipset_chain_name($vmid, $ipfilter_name, $ipversion)
2405         if $options->{ipfilter} || $vmfw_conf->{ipset}->{$ipfilter_name};
2406
2407     if ($options->{enable}) {
2408         # create chain with mac and ip filter
2409         ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
2410
2411         ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $tapchain, $netid, $direction, $options, $ipversion, $vmid);
2412
2413         ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface);
2414
2415         # implement policy
2416         my $policy;
2417
2418         if ($direction eq 'OUT') {
2419             $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
2420         } else {
2421             $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
2422         }
2423
2424         my $accept = generate_nfqueue($options);
2425         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
2426         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, $policy, $loglevel, $accept_action);
2427     } else {
2428         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : 'ACCEPT';
2429         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, 'ACCEPT', $loglevel, $accept_action);
2430     }
2431
2432     # plug the tap chain to bridge chain
2433     if ($direction eq 'IN') {
2434         ruleset_addrule($ruleset, "PVEFW-FWBR-IN",
2435                         "-m physdev --physdev-is-bridged --physdev-out $iface", "-j $tapchain");
2436     } else {
2437         ruleset_addrule($ruleset, "PVEFW-FWBR-OUT",
2438                         "-m physdev --physdev-is-bridged --physdev-in $iface", "-j $tapchain");
2439     }
2440 }
2441
2442 sub enable_host_firewall {
2443     my ($ruleset, $hostfw_conf, $cluster_conf, $ipversion, $corosync_conf) = @_;
2444
2445     my $options = $hostfw_conf->{options};
2446     my $cluster_options = $cluster_conf->{options};
2447     my $rules = $hostfw_conf->{rules};
2448     my $cluster_rules = $cluster_conf->{rules};
2449
2450     # corosync preparation
2451     my $corosync_rule = "-p udp --dport 5404:5405";
2452     my $corosync_local_addresses = {};
2453     my $multicast_enabled;
2454     my $local_hostname = PVE::INotify::nodename();
2455     if (defined($corosync_conf)) {
2456         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2457             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2458
2459             if ($node_name eq $local_hostname) {
2460                 $corosync_local_addresses->{$key} = $node_ip;
2461             }
2462         });
2463
2464         # allow multicast only if enabled in config
2465         my $corosync_transport = $corosync_conf->{main}->{totem}->{transport};
2466         $multicast_enabled = defined($corosync_transport) && $corosync_transport eq 'udp';
2467     }
2468
2469     # host inbound firewall
2470     my $chain = "PVEFW-HOST-IN";
2471     ruleset_create_chain($ruleset, $chain);
2472
2473     my $loglevel = get_option_log_level($options, "log_level_in");
2474
2475     ruleset_addrule($ruleset, $chain, "-i lo", "-j ACCEPT");
2476
2477     ruleset_chain_add_conn_filters($ruleset, $chain, 0, 'ACCEPT');
2478     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'IN', '-j RETURN');
2479     ruleset_chain_add_input_filters($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel);
2480
2481     # we use RETURN because we need to check also tap rules
2482     my $accept_action = 'RETURN';
2483
2484     ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
2485
2486     # add host rules first, so that cluster wide rules can be overwritten
2487     foreach my $rule (@$rules, @$cluster_rules) {
2488         next if !$rule->{enable} || $rule->{errors};
2489         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2490
2491         $rule->{iface_in} = $rule->{iface} if $rule->{iface};
2492
2493         eval {
2494             $rule->{logmsg} = "$rule->{action}: ";
2495             if ($rule->{type} eq 'group') {
2496                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'IN', $accept_action, $ipversion);
2497             } elsif ($rule->{type} eq 'in') {
2498                 rule_substitude_action($rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
2499                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $hostfw_conf, 0);
2500             }
2501         };
2502         warn $@ if $@;
2503         delete $rule->{iface_in};
2504     }
2505
2506     # allow standard traffic for management ipset (includes cluster network)
2507     my $mngmnt_ipset_chain = compute_ipset_chain_name(0, "management", $ipversion);
2508     my $mngmntsrc = "-m set --match-set ${mngmnt_ipset_chain} src";
2509     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 8006", "-j $accept_action");  # PVE API
2510     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
2511     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
2512     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 22", "-j $accept_action");  # SSH
2513     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 60000:60050", "-j $accept_action");  # Migration
2514
2515     # corosync inbound rules
2516     if (defined($corosync_conf)) {
2517         ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action")
2518             if $multicast_enabled;
2519
2520         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2521             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2522             my $destination = $corosync_local_addresses->{$key};
2523
2524             if ($node_name ne $local_hostname && defined($destination)) {
2525                 # accept only traffic on same ring
2526                 ruleset_addrule($ruleset, $chain, "-d $destination -s $node_ip $corosync_rule", "-j $accept_action");
2527             }
2528         });
2529     }
2530
2531     # implement input policy
2532     my $policy = $cluster_options->{policy_in} || 'DROP'; # allow nothing by default
2533     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2534
2535     # host outbound firewall
2536     $chain = "PVEFW-HOST-OUT";
2537     ruleset_create_chain($ruleset, $chain);
2538
2539     $loglevel = get_option_log_level($options, "log_level_out");
2540
2541     ruleset_addrule($ruleset, $chain, "-o lo", "-j ACCEPT");
2542
2543     ruleset_chain_add_conn_filters($ruleset, $chain, 0, 'ACCEPT');
2544
2545     # we use RETURN because we may want to check other thigs later
2546     $accept_action = 'RETURN';
2547     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'OUT', "-j $accept_action");
2548
2549     ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
2550
2551     # add host rules first, so that cluster wide rules can be overwritten
2552     foreach my $rule (@$rules, @$cluster_rules) {
2553         next if !$rule->{enable} || $rule->{errors};
2554         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2555
2556         $rule->{iface_out} = $rule->{iface} if $rule->{iface};
2557         eval {
2558             $rule->{logmsg} = "$rule->{action}: ";
2559             if ($rule->{type} eq 'group') {
2560                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'OUT', $accept_action, $ipversion);
2561             } elsif ($rule->{type} eq 'out') {
2562                 rule_substitude_action($rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
2563                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $hostfw_conf, 0);
2564             }
2565         };
2566         warn $@ if $@;
2567         delete $rule->{iface_out};
2568     }
2569
2570     # allow standard traffic on cluster network
2571     my $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
2572     my $localnet_ver = $cluster_conf->{aliases}->{local_network}->{ipversion};
2573
2574     if ($localnet && ($ipversion == $localnet_ver)) {
2575         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 8006", "-j $accept_action");  # PVE API
2576         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 22", "-j $accept_action");  # SSH
2577         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
2578         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
2579     }
2580
2581     # corosync outbound rules
2582     if (defined($corosync_conf)) {
2583         ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action")
2584             if $multicast_enabled;
2585
2586         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2587             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2588             my $source = $corosync_local_addresses->{$key};
2589
2590             if ($node_name ne $local_hostname && defined($source)) {
2591                 # accept only traffic on same ring
2592                 ruleset_addrule($ruleset, $chain, "-s $source -d $node_ip $corosync_rule", "-j $accept_action");
2593             }
2594         });
2595     }
2596
2597     # implement output policy
2598     $policy = $cluster_options->{policy_out} || 'ACCEPT'; # allow everything by default
2599     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2600
2601     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "", "-j PVEFW-HOST-OUT");
2602     ruleset_addrule($ruleset, "PVEFW-INPUT", "", "-j PVEFW-HOST-IN");
2603 }
2604
2605 sub generate_group_rules {
2606     my ($ruleset, $cluster_conf, $group, $ipversion) = @_;
2607
2608     my $rules = $cluster_conf->{groups}->{$group};
2609
2610     if (!$rules) {
2611         warn "no such security group '$group'\n";
2612         $rules = []; # create empty chain
2613     }
2614
2615     my $chain = "GROUP-${group}-IN";
2616
2617     ruleset_create_chain($ruleset, $chain);
2618     ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2619
2620     foreach my $rule (@$rules) {
2621         next if $rule->{type} ne 'in';
2622         next if !$rule->{enable} || $rule->{errors};
2623         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2624         rule_substitude_action($rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
2625         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf);
2626     }
2627
2628     $chain = "GROUP-${group}-OUT";
2629
2630     ruleset_create_chain($ruleset, $chain);
2631     ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2632
2633     foreach my $rule (@$rules) {
2634         next if $rule->{type} ne 'out';
2635         next if !$rule->{enable} || $rule->{errors};
2636         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2637         # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
2638         # check also other tap rules later
2639         rule_substitude_action($rule, { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" });
2640         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf);
2641     }
2642 }
2643
2644 my $MAX_NETS = 32;
2645 my $valid_netdev_names = {};
2646 for (my $i = 0; $i < $MAX_NETS; $i++)  {
2647     $valid_netdev_names->{"net$i"} = 1;
2648 }
2649
2650 sub get_mark_values {
2651     my ($value, $mask) = @_;
2652     $value = hex($value) if $value =~ /^0x/;
2653     $mask = hex($mask) if defined($mask) && $mask =~ /^0x/;
2654     $mask = 0xffffffff if !defined($mask);
2655     return ($value, $mask);
2656 }
2657
2658 sub parse_fw_rule {
2659     my ($prefix, $line, $cluster_conf, $fw_conf, $rule_env) = @_;
2660
2661     my $orig_line = $line;
2662
2663     my $rule = {};
2664
2665     # we can add single line comments to the end of the rule
2666     if ($line =~ s/#\s*(.*?)\s*$//) {
2667         $rule->{comment} = decode('utf8', $1);
2668     }
2669
2670     # we can disable a rule when prefixed with '|'
2671
2672     $rule->{enable} = $line =~ s/^\|// ? 0 : 1;
2673
2674     $line =~ s/^(\S+)\s+(\S+)\s*// ||
2675         die "unable to parse rule: $line\n";
2676
2677     $rule->{type} = lc($1);
2678     $rule->{action} = $2;
2679
2680     if ($rule->{type} eq  'in' || $rule->{type} eq 'out') {
2681         if ($rule->{action} =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
2682             $rule->{macro} = $1;
2683             $rule->{action} = $2;
2684         }
2685     }
2686
2687     while (length($line)) {
2688         if ($line =~ s/^-i (\S+)\s*//) {
2689             $rule->{iface} = $1;
2690             next;
2691         }
2692
2693         last if $rule->{type} eq 'group';
2694
2695         if ($line =~ s/^-p (\S+)\s*//) {
2696             $rule->{proto} = $1;
2697             next;
2698         }
2699
2700         if ($line =~ s/^-dport (\S+)\s*//) {
2701             $rule->{dport} = $1;
2702             next;
2703         }
2704
2705         if ($line =~ s/^-sport (\S+)\s*//) {
2706             $rule->{sport} = $1;
2707             next;
2708         }
2709         if ($line =~ s/^-source (\S+)\s*//) {
2710             $rule->{source} = $1;
2711             next;
2712         }
2713         if ($line =~ s/^-dest (\S+)\s*//) {
2714             $rule->{dest} = $1;
2715             next;
2716         }
2717         if ($line =~ s/^-log (emerg|alert|crit|err|warning|notice|info|debug|nolog)\s*//) {
2718             $rule->{log} = $1;
2719             next;
2720         }
2721
2722         last;
2723     }
2724
2725     die "unable to parse rule parameters: $line\n" if length($line);
2726
2727     $rule = verify_rule($rule, $cluster_conf, $fw_conf, $rule_env, 1);
2728     if ($rule->{errors}) {
2729         # The verbose flag really means we're running from the CLI and want
2730         # output on the console - in the other case we really want such errors
2731         # to go into the syslog instead.
2732         my $log = $verbose ? sub { warn @_ } : sub { syslog(err => @_) };
2733         $log->("$prefix - errors in rule parameters: $orig_line\n");
2734         foreach my $p (keys %{$rule->{errors}}) {
2735             $log->("  $p: $rule->{errors}->{$p}\n");
2736         }
2737     }
2738
2739     return $rule;
2740 }
2741
2742 sub verify_ethertype {
2743     my ($value) = @_;
2744     my $types = get_etc_ethertypes();
2745     die "unknown ethernet protocol type: $value\n"
2746         if !defined($types->{byname}->{$value}) &&
2747            !defined($types->{byid}->{$value});
2748 }
2749
2750 sub parse_vmfw_option {
2751     my ($line) = @_;
2752
2753     my ($opt, $value);
2754
2755     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2756
2757     if ($line =~ m/^(enable|dhcp|ndp|radv|macfilter|ipfilter|ips):\s*(0|1)\s*$/i) {
2758         $opt = lc($1);
2759         $value = int($2);
2760     } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
2761         $opt = lc($1);
2762         $value = $2 ? lc($3) : '';
2763     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2764         $opt = lc($1);
2765         $value = uc($3);
2766     } elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
2767         $opt = lc($1);
2768         $value = $2;
2769     } elsif ($line =~ m/^(layer2_protocols):\s*(((\S+)[,]?)+)\s*$/i) {
2770         $opt = lc($1);
2771         $value = $2;
2772         verify_ethertype($_) foreach split(/\s*,\s*/, $value);
2773     } else {
2774         die "can't parse option '$line'\n"
2775     }
2776
2777     return ($opt, $value);
2778 }
2779
2780 sub parse_hostfw_option {
2781     my ($line) = @_;
2782
2783     my ($opt, $value);
2784
2785     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2786
2787     if ($line =~ m/^(enable|nosmurfs|tcpflags|ndp|log_nf_conntrack|nf_conntrack_allow_invalid|protection_synflood):\s*(0|1)\s*$/i) {
2788         $opt = lc($1);
2789         $value = int($2);
2790     } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
2791         $opt = lc($1);
2792         $value = $2 ? lc($3) : '';
2793     } elsif ($line =~ m/^(nf_conntrack_max|nf_conntrack_tcp_timeout_established|nf_conntrack_tcp_timeout_syn_recv|protection_synflood_rate|protection_synflood_burst|protection_limit):\s*(\d+)\s*$/i) {
2794         $opt = lc($1);
2795         $value = int($2);
2796     } else {
2797         die "can't parse option '$line'\n"
2798     }
2799
2800     return ($opt, $value);
2801 }
2802
2803 sub parse_clusterfw_option {
2804     my ($line) = @_;
2805
2806     my ($opt, $value);
2807
2808     if ($line =~ m/^(enable):\s*(\d+)\s*$/i) {
2809         $opt = lc($1);
2810         $value = int($2);
2811         if (($value > 1) && ((time() - $value) > 60)) {
2812             $value = 0
2813         }
2814     } elsif ($line =~ m/^(ebtables):\s*(0|1)\s*$/i) {
2815         $opt = lc($1);
2816         $value = int($2);
2817     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2818         $opt = lc($1);
2819         $value = uc($3);
2820     } elsif ($line =~ m/^(log_ratelimit):\s*(\S+)\s*$/) {
2821         $opt = lc($1);
2822         $value = $2;
2823     } else {
2824         die "can't parse option '$line'\n"
2825     }
2826
2827     return ($opt, $value);
2828 }
2829
2830 sub resolve_alias {
2831     my ($clusterfw_conf, $fw_conf, $cidr) = @_;
2832
2833     my $alias = lc($cidr);
2834     my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2835     $e = $clusterfw_conf->{aliases}->{$alias} if !$e && $clusterfw_conf;
2836
2837     die "no such alias '$cidr'\n" if !$e;;
2838
2839     return wantarray ? ($e->{cidr}, $e->{ipversion}) : $e->{cidr};
2840 }
2841
2842 sub parse_ip_or_cidr {
2843     my ($cidr) = @_;
2844
2845     my $ipversion;
2846
2847     if ($cidr =~ m!^(?:$IPV6RE)(/(\d+))?$!) {
2848         $cidr =~ s|/128$||;
2849         $ipversion = 6;
2850     } elsif ($cidr =~ m!^(?:$IPV4RE)(/(\d+))?$!) {
2851         $cidr =~ s|/32$||;
2852         $ipversion = 4;
2853     } else {
2854         die "value does not look like a valid IP address or CIDR network\n";
2855     }
2856
2857     return wantarray ? ($cidr, $ipversion) : $cidr;
2858 }
2859
2860 sub parse_alias {
2861     my ($line) = @_;
2862
2863     # we can add single line comments to the end of the line
2864     my $comment = decode('utf8', $1) if $line =~ s/\s*#\s*(.*?)\s*$//;
2865
2866     if ($line =~ m/^(\S+)\s(\S+)$/) {
2867         my ($name, $cidr) = ($1, $2);
2868         my $ipversion;
2869
2870         ($cidr, $ipversion) = parse_ip_or_cidr($cidr);
2871
2872         my $data = {
2873             name => $name,
2874             cidr => $cidr,
2875             ipversion => $ipversion,
2876         };
2877         $data->{comment} = $comment  if $comment;
2878         return $data;
2879     }
2880
2881     return undef;
2882 }
2883
2884 sub generic_fw_config_parser {
2885     my ($filename, $cluster_conf, $empty_conf, $rule_env) = @_;
2886
2887     my $section;
2888     my $group;
2889
2890     my $res = $empty_conf;
2891
2892     my $raw;
2893     if ($filename =~ m!^/etc/pve/(.*)$!) {
2894         $raw = PVE::Cluster::get_config($1);
2895     } else {
2896         $raw = eval { PVE::Tools::file_get_contents($filename) }; # ignore errors
2897     }
2898     return {} if !$raw;
2899
2900     my $curr_group_keys = {};
2901
2902     my $linenr = 0;
2903     while ($raw =~ /^\h*(.*?)\h*$/gm) {
2904         my $line = $1;
2905         $linenr++;
2906         next if $line =~ m/^#/;
2907         next if $line =~ m/^\s*$/;
2908         chomp $line;
2909
2910         my $prefix = "$filename (line $linenr)";
2911
2912         if ($empty_conf->{options} && ($line =~ m/^\[options\]$/i)) {
2913             $section = 'options';
2914             next;
2915         }
2916
2917         if ($empty_conf->{aliases} && ($line =~ m/^\[aliases\]$/i)) {
2918             $section = 'aliases';
2919             next;
2920         }
2921
2922         if ($empty_conf->{groups} && ($line =~ m/^\[group\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2923             $section = 'groups';
2924             $group = lc($1);
2925             my $comment = $2;
2926             eval {
2927                 die "security group name too long\n" if length($group) > $max_group_name_length;
2928                 die "invalid security group name '$group'\n" if $group !~ m/^${security_group_name_pattern}$/;
2929             };
2930             if (my $err = $@) {
2931                 ($section, $group, $comment) = undef;
2932                 warn "$prefix: $err";
2933                 next;
2934             }
2935
2936             $res->{$section}->{$group} = [];
2937             $res->{group_comments}->{$group} =  decode('utf8', $comment)
2938                 if $comment;
2939             next;
2940         }
2941
2942         if ($empty_conf->{rules} && ($line =~ m/^\[rules\]$/i)) {
2943             $section = 'rules';
2944             next;
2945         }
2946
2947         if ($empty_conf->{ipset} && ($line =~ m/^\[ipset\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2948             $section = 'ipset';
2949             $group = lc($1);
2950             my $comment = $2;
2951             eval {
2952                 die "ipset name too long\n" if length($group) > $max_ipset_name_length;
2953                 die "invalid ipset name '$group'\n" if $group !~ m/^${ipset_name_pattern}$/;
2954             };
2955             if (my $err = $@) {
2956                 ($section, $group, $comment) = undef;
2957                 warn "$prefix: $err";
2958                 next;
2959             }
2960
2961             $res->{$section}->{$group} = [];
2962             $curr_group_keys = {};
2963
2964             $res->{ipset_comments}->{$group} = decode('utf8', $comment)
2965                 if $comment;
2966             next;
2967         }
2968
2969         if (!$section) {
2970             warn "$prefix: skip line - no section\n";
2971             next;
2972         }
2973
2974         if ($section eq 'options') {
2975             eval {
2976                 my ($opt, $value);
2977                 if ($rule_env eq 'cluster') {
2978                     ($opt, $value) = parse_clusterfw_option($line);
2979                 } elsif ($rule_env eq 'host') {
2980                     ($opt, $value) = parse_hostfw_option($line);
2981                 } else {
2982                     ($opt, $value) = parse_vmfw_option($line);
2983                 }
2984                 $res->{options}->{$opt} = $value;
2985             };
2986             warn "$prefix: $@" if $@;
2987         } elsif ($section eq 'aliases') {
2988             eval {
2989                 my $data = parse_alias($line);
2990                 $res->{aliases}->{lc($data->{name})} = $data;
2991             };
2992             warn "$prefix: $@" if $@;
2993         } elsif ($section eq 'rules') {
2994             my $rule;
2995             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, $res, $rule_env); };
2996             if (my $err = $@) {
2997                 warn "$prefix: $err";
2998                 next;
2999             }
3000             push @{$res->{$section}}, $rule;
3001         } elsif ($section eq 'groups') {
3002             my $rule;
3003             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, undef, 'group'); };
3004             if (my $err = $@) {
3005                 warn "$prefix: $err";
3006                 next;
3007             }
3008             push @{$res->{$section}->{$group}}, $rule;
3009         } elsif ($section eq 'ipset') {
3010             # we can add single line comments to the end of the rule
3011             my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
3012
3013             $line =~ m/^(\!)?\s*(\S+)\s*$/;
3014             my $nomatch = $1;
3015             my $cidr = $2;
3016             my $errors;
3017
3018             if ($nomatch && !$feature_ipset_nomatch) {
3019                 $errors->{nomatch} = "nomatch not supported by kernel";
3020             }
3021
3022             eval {
3023                 if ($cidr =~ m/^${ip_alias_pattern}$/) {
3024                     resolve_alias($cluster_conf, $res, $cidr); # make sure alias exists
3025                 } else {
3026                     $cidr = parse_ip_or_cidr($cidr);
3027                 }
3028                 die "duplicate ipset entry for '$cidr'\n"
3029                     if defined($curr_group_keys->{$cidr});
3030             };
3031             if (my $err = $@) {
3032                 chomp $err;
3033                 $errors->{cidr} = $err;
3034             }
3035
3036             if ($cidr =~ m!/0+$!) {
3037                 $errors->{cidr} = "a zero prefix is not allowed in ipset entries\n";
3038             }
3039
3040             my $entry = { cidr => $cidr };
3041             $entry->{nomatch} = 1 if $nomatch;
3042             $entry->{comment} = $comment if $comment;
3043             $entry->{errors} =  $errors if $errors;
3044
3045             if ($verbose && $errors) {
3046                 warn "$prefix - errors in ipset '$group': $line\n";
3047                 foreach my $p (keys %{$errors}) {
3048                     warn "  $p: $errors->{$p}\n";
3049                 }
3050             }
3051
3052             push @{$res->{$section}->{$group}}, $entry;
3053             $curr_group_keys->{$cidr} = 1;
3054         } else {
3055             warn "$prefix: skip line - unknown section\n";
3056             next;
3057         }
3058     }
3059
3060     return $res;
3061 }
3062
3063 # this is only used to prevent concurrent runs of rule compilation/application
3064 # see lock_*_conf for cfs locks protectiong config modification
3065 sub run_locked {
3066     my ($code, @param) = @_;
3067
3068     my $timeout = 10;
3069
3070     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
3071
3072     die $@ if $@;
3073
3074     return $res;
3075 }
3076
3077 sub read_local_vm_config {
3078
3079     my $qemu = {};
3080     my $lxc = {};
3081
3082     my $vmdata = { qemu => $qemu, lxc => $lxc };
3083
3084     my $vmlist = PVE::Cluster::get_vmlist();
3085     return $vmdata if !$vmlist || !$vmlist->{ids};
3086     my $ids = $vmlist->{ids};
3087
3088     foreach my $vmid (keys %$ids) {
3089         next if !$vmid; # skip VE0
3090         my $d = $ids->{$vmid};
3091         next if !$d->{node} || $d->{node} ne $nodename;
3092         next if !$d->{type};
3093         if ($d->{type} eq 'qemu') {
3094             if ($have_qemu_server) {
3095                 my $cfspath = PVE::QemuConfig->cfs_config_path($vmid);
3096                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
3097                     $qemu->{$vmid} = $conf;
3098                 }
3099             }
3100         } elsif ($d->{type} eq 'lxc') {
3101             if ($have_lxc) {
3102                 my $cfspath = PVE::LXC::Config->cfs_config_path($vmid);
3103                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
3104                     $lxc->{$vmid} = $conf;
3105                 }
3106             }
3107         }
3108     }
3109
3110     return $vmdata;
3111 };
3112
3113 sub lock_vmfw_conf {
3114     my ($vmid, $timeout, $code, @param) = @_;
3115
3116     die "can't lock VM firewall config for undefined VMID\n"
3117         if !defined($vmid);
3118
3119     my $res = PVE::Cluster::cfs_lock_firewall("vm-$vmid", $timeout, $code, @param);
3120     die $@ if $@;
3121
3122     return $res;
3123 }
3124
3125 sub load_vmfw_conf {
3126     my ($cluster_conf, $rule_env, $vmid, $dir) = @_;
3127
3128     $dir = $pvefw_conf_dir if !defined($dir);
3129     my $filename = "$dir/$vmid.fw";
3130
3131     my $empty_conf = {
3132         rules => [],
3133         options => {},
3134         aliases => {},
3135         ipset => {} ,
3136         ipset_comments => {},
3137     };
3138
3139     my $vmfw_conf = generic_fw_config_parser($filename, $cluster_conf, $empty_conf, $rule_env);
3140     $vmfw_conf->{vmid} = $vmid;
3141
3142     return $vmfw_conf;
3143 }
3144
3145 my $format_rules = sub {
3146     my ($rules, $allow_iface) = @_;
3147
3148     my $raw = '';
3149
3150     foreach my $rule (@$rules) {
3151         if ($rule->{type} eq  'in' || $rule->{type} eq 'out' || $rule->{type} eq 'group') {
3152             $raw .= '|' if defined($rule->{enable}) && !$rule->{enable};
3153             $raw .= uc($rule->{type});
3154             if ($rule->{macro}) {
3155                 $raw .= " $rule->{macro}($rule->{action})";
3156             } else {
3157                 $raw .= " " . $rule->{action};
3158             }
3159             if ($allow_iface && $rule->{iface}) {
3160                 $raw .= " -i $rule->{iface}";
3161             }
3162
3163             if ($rule->{type} ne  'group')  {
3164                 $raw .= " -source $rule->{source}" if $rule->{source};
3165                 $raw .= " -dest $rule->{dest}" if $rule->{dest};
3166                 $raw .= " -p $rule->{proto}" if $rule->{proto};
3167                 $raw .= " -dport $rule->{dport}" if $rule->{dport};
3168                 $raw .= " -sport $rule->{sport}" if $rule->{sport};
3169                 $raw .= " -log $rule->{log}" if $rule->{log};
3170             }
3171
3172             $raw .= " # " . encode('utf8', $rule->{comment})
3173                 if $rule->{comment} && $rule->{comment} !~ m/^\s*$/;
3174             $raw .= "\n";
3175         } else {
3176             die "unknown rule type '$rule->{type}'";
3177         }
3178     }
3179
3180     return $raw;
3181 };
3182
3183 my $format_options = sub {
3184     my ($options) = @_;
3185
3186     my $raw = '';
3187
3188     $raw .= "[OPTIONS]\n\n";
3189     foreach my $opt (keys %$options) {
3190         $raw .= "$opt: $options->{$opt}\n";
3191     }
3192     $raw .= "\n";
3193
3194     return $raw;
3195 };
3196
3197 my $format_aliases = sub {
3198     my ($aliases) = @_;
3199
3200     my $raw = '';
3201
3202     $raw .= "[ALIASES]\n\n";
3203     foreach my $k (keys %$aliases) {
3204         my $e = $aliases->{$k};
3205         $raw .= "$e->{name} $e->{cidr}";
3206         $raw .= " # " . encode('utf8', $e->{comment})
3207             if $e->{comment} && $e->{comment} !~ m/^\s*$/;
3208         $raw .= "\n";
3209     }
3210     $raw .= "\n";
3211
3212     return $raw;
3213 };
3214
3215 my $format_ipsets = sub {
3216     my ($fw_conf) = @_;
3217
3218     my $raw = '';
3219
3220     foreach my $ipset (sort keys %{$fw_conf->{ipset}}) {
3221         if (my $comment = $fw_conf->{ipset_comments}->{$ipset}) {
3222             my $utf8comment = encode('utf8', $comment);
3223             $raw .= "[IPSET $ipset] # $utf8comment\n\n";
3224         } else {
3225             $raw .= "[IPSET $ipset]\n\n";
3226         }
3227         my $options = $fw_conf->{ipset}->{$ipset};
3228
3229         my $nethash = {};
3230         foreach my $entry (@$options) {
3231             my $cidr = $entry->{cidr};
3232             if (defined($nethash->{$cidr})) {
3233                 warn "ignoring duplicate ipset entry '$cidr'\n";
3234                 next;
3235             }
3236
3237             $nethash->{$cidr} = $entry;
3238         }
3239
3240         foreach my $cidr (sort keys %$nethash) {
3241             my $entry = $nethash->{$cidr};
3242             my $line = $entry->{nomatch} ? '!' : '';
3243             $line .= $entry->{cidr};
3244             $line .= " # " . encode('utf8', $entry->{comment})
3245                 if $entry->{comment} && $entry->{comment} !~ m/^\s*$/;
3246             $raw .= "$line\n";
3247         }
3248
3249         $raw .= "\n";
3250     }
3251
3252     return $raw;
3253 };
3254
3255 sub save_vmfw_conf {
3256     my ($vmid, $vmfw_conf) = @_;
3257
3258     my $raw = '';
3259
3260     my $options = $vmfw_conf->{options};
3261     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3262
3263     my $aliases = $vmfw_conf->{aliases};
3264     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3265
3266     $raw .= &$format_ipsets($vmfw_conf) if $vmfw_conf->{ipset};
3267
3268     my $rules = $vmfw_conf->{rules} || [];
3269     if ($rules && scalar(@$rules)) {
3270         $raw .= "[RULES]\n\n";
3271         $raw .= &$format_rules($rules, 1);
3272         $raw .= "\n";
3273     }
3274
3275     my $filename = "$pvefw_conf_dir/$vmid.fw";
3276     if ($raw) {
3277         mkdir $pvefw_conf_dir;
3278         PVE::Tools::file_set_contents($filename, $raw);
3279     } else {
3280         unlink $filename;
3281     }
3282 }
3283
3284 sub remove_vmfw_conf {
3285     my ($vmid) = @_;
3286
3287     my $vmfw_conffile = "$pvefw_conf_dir/$vmid.fw";
3288
3289     unlink $vmfw_conffile;
3290 }
3291
3292 sub clone_vmfw_conf {
3293     my ($vmid, $newid) = @_;
3294
3295     my $sourcevm_conffile = "$pvefw_conf_dir/$vmid.fw";
3296     my $clonevm_conffile = "$pvefw_conf_dir/$newid.fw";
3297
3298     lock_vmfw_conf($newid, 10, sub {
3299         if (-f $clonevm_conffile) {
3300             unlink $clonevm_conffile;
3301         }
3302         if (-f $sourcevm_conffile) {
3303             my $data = PVE::Tools::file_get_contents($sourcevm_conffile);
3304             PVE::Tools::file_set_contents($clonevm_conffile, $data);
3305         }
3306     });
3307 }
3308
3309 sub read_vm_firewall_configs {
3310     my ($cluster_conf, $vmdata, $dir) = @_;
3311
3312     my $vmfw_configs = {};
3313
3314     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3315         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'vm', $vmid, $dir);
3316         next if !$vmfw_conf->{options}; # skip if file does not exist
3317         $vmfw_configs->{$vmid} = $vmfw_conf;
3318     }
3319     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3320         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'ct', $vmid, $dir);
3321         next if !$vmfw_conf->{options}; # skip if file does not exist
3322         $vmfw_configs->{$vmid} = $vmfw_conf;
3323     }
3324
3325     return $vmfw_configs;
3326 }
3327
3328 sub get_option_log_level {
3329     my ($options, $k) = @_;
3330
3331     my $v = $options->{$k};
3332     $v = $default_log_level if !defined($v);
3333
3334     return undef if $v eq '' || $v eq 'nolog';
3335
3336     return $v if defined($log_level_hash->{$v});
3337
3338     warn "unknown log level ($k = '$v')\n";
3339
3340     return undef;
3341 }
3342
3343 sub generate_std_chains {
3344     my ($ruleset, $options, $ipversion) = @_;
3345
3346     my $std_chains = $pve_std_chains->{$ipversion} || die "internal error";
3347
3348     my $loglevel = get_option_log_level($options, 'smurf_log_level');
3349     my $chain = 'PVEFW-smurflog';
3350     if ( $std_chains->{$chain} ) {
3351         foreach my $r (@{$std_chains->{$chain}}) {
3352           $r->{log} = $loglevel;
3353         }
3354     }
3355
3356     # same as shorewall logflags action.
3357     $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
3358     $chain = 'PVEFW-logflags';
3359     if ( $std_chains->{$chain} ) {
3360         foreach my $r (@{$std_chains->{$chain}}) {
3361           $r->{log} = $loglevel;
3362         }
3363     }
3364
3365     foreach my $chain (keys %$std_chains) {
3366         ruleset_create_chain($ruleset, $chain);
3367         foreach my $rule (@{$std_chains->{$chain}}) {
3368             if (ref($rule)) {
3369                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, 0);
3370             } else {
3371                 die "rule $rule as string - should not happen";
3372             }
3373         }
3374     }
3375 }
3376
3377 sub generate_ipset_chains {
3378     my ($ipset_ruleset, $clusterfw_conf, $fw_conf, $device_ips, $ipsets) = @_;
3379
3380     foreach my $ipset (keys %{$ipsets}) {
3381
3382         my $options = $ipsets->{$ipset};
3383
3384         if ($device_ips && $ipset =~ /^ipfilter-(net\d+)$/) {
3385             if (my $ips = $device_ips->{$1}) {
3386                 $options = [@$options, @$ips];
3387             }
3388         }
3389
3390         # remove duplicates
3391         my $nethash = {};
3392         foreach my $entry (@$options) {
3393             next if $entry->{errors}; # skip entries with errors
3394             eval {
3395                 my ($cidr, $ver);
3396                 if ($entry->{cidr} =~ m/^${ip_alias_pattern}$/) {
3397                     ($cidr, $ver) = resolve_alias($clusterfw_conf, $fw_conf, $entry->{cidr});
3398                 } else {
3399                     ($cidr, $ver) = parse_ip_or_cidr($entry->{cidr});
3400                 }
3401                 #http://backreference.org/2013/03/01/ipv6-address-normalization/
3402                 if ($ver == 6) {
3403                     # ip_compress_address takes an address only, no CIDR
3404                     my ($addr, $prefix_len) = ($cidr =~ m@^([^/]*)(/.*)?$@);
3405                     $cidr = lc(Net::IP::ip_compress_address($addr, 6));
3406                     $cidr .= $prefix_len if defined($prefix_len);
3407                     $cidr =~ s|/128$||;
3408                 } else {
3409                     $cidr =~ s|/32$||;
3410                 }
3411
3412                 $nethash->{$ver}->{$cidr} = { cidr => $cidr, nomatch => $entry->{nomatch} };
3413             };
3414             warn $@ if $@;
3415         }
3416
3417         foreach my $ipversion (4, 6) {
3418             my $data = $nethash->{$ipversion};
3419
3420             my $name = compute_ipset_chain_name($fw_conf->{vmid}, $ipset, $ipversion);
3421
3422             my $hashsize = scalar(@$options);
3423             if ($hashsize <= 64) {
3424                 $hashsize = 64;
3425             } else {
3426                 $hashsize = round_powerof2($hashsize);
3427             }
3428
3429             my $family = $ipversion == "6" ? "inet6" : "inet";
3430
3431             $ipset_ruleset->{$name} = ["create $name hash:net family $family hashsize $hashsize maxelem $hashsize"];
3432
3433             foreach my $cidr (sort keys %$data) {
3434                 my $entry = $data->{$cidr};
3435
3436                 my $cmd = "add $name $cidr";
3437                 if ($entry->{nomatch}) {
3438                     if ($feature_ipset_nomatch) {
3439                         push @{$ipset_ruleset->{$name}}, "$cmd nomatch";
3440                     } else {
3441                         warn "ignore !$cidr - nomatch not supported by kernel\n";
3442                     }
3443                 } else {
3444                     push @{$ipset_ruleset->{$name}}, $cmd;
3445                 }
3446             }
3447         }
3448     }
3449 }
3450
3451 sub round_powerof2 {
3452     my ($int) = @_;
3453
3454     $int--;
3455     $int |= $int >> $_ foreach (1,2,4,8,16);
3456     return ++$int;
3457 }
3458
3459 my $set_global_log_ratelimit = sub {
3460     my $cluster_opts = shift;
3461
3462     $global_log_ratelimit = '--limit 1/sec';
3463     if (defined(my $log_rlimit = $cluster_opts->{log_ratelimit})) {
3464         my $ll_format = $cluster_option_properties->{log_ratelimit}->{format};
3465         my $limit = PVE::JSONSchema::parse_property_string($ll_format, $log_rlimit);
3466
3467         if ($limit->{enable}) {
3468             if (my $rate = $limit->{rate}) {
3469                 $global_log_ratelimit = "--limit $rate";
3470             }
3471             if (my $burst = $limit->{burst}) {
3472                 $global_log_ratelimit .= " --limit-burst $burst";
3473             }
3474         } else {
3475             $global_log_ratelimit = undef;
3476         }
3477     }
3478 };
3479
3480 sub lock_clusterfw_conf {
3481     my ($timeout, $code, @param) = @_;
3482
3483     my $res = PVE::Cluster::cfs_lock_firewall("cluster", $timeout, $code, @param);
3484     die $@ if $@;
3485
3486     return $res;
3487 }
3488
3489 sub load_clusterfw_conf {
3490     my ($filename) = @_;
3491
3492     $filename = $clusterfw_conf_filename if !defined($filename);
3493     my $empty_conf = {
3494         rules => [],
3495         options => {},
3496         aliases => {},
3497         groups => {},
3498         group_comments => {},
3499         ipset => {} ,
3500         ipset_comments => {},
3501     };
3502
3503     my $cluster_conf = generic_fw_config_parser($filename, $empty_conf, $empty_conf, 'cluster');
3504     $set_global_log_ratelimit->($cluster_conf->{options});
3505
3506     return $cluster_conf;
3507 }
3508
3509 sub save_clusterfw_conf {
3510     my ($cluster_conf) = @_;
3511
3512     my $raw = '';
3513
3514     my $options = $cluster_conf->{options};
3515     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3516
3517     my $aliases = $cluster_conf->{aliases};
3518     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3519
3520     $raw .= &$format_ipsets($cluster_conf) if $cluster_conf->{ipset};
3521
3522     my $rules = $cluster_conf->{rules};
3523     if ($rules && scalar(@$rules)) {
3524         $raw .= "[RULES]\n\n";
3525         $raw .= &$format_rules($rules, 1);
3526         $raw .= "\n";
3527     }
3528
3529     if ($cluster_conf->{groups}) {
3530         foreach my $group (sort keys %{$cluster_conf->{groups}}) {
3531             my $rules = $cluster_conf->{groups}->{$group};
3532             if (my $comment = $cluster_conf->{group_comments}->{$group}) {
3533                 my $utf8comment = encode('utf8', $comment);
3534                 $raw .= "[group $group] # $utf8comment\n\n";
3535             } else {
3536                 $raw .= "[group $group]\n\n";
3537             }
3538
3539             $raw .= &$format_rules($rules, 0);
3540             $raw .= "\n";
3541         }
3542     }
3543
3544     if ($raw) {
3545         mkdir $pvefw_conf_dir;
3546         PVE::Tools::file_set_contents($clusterfw_conf_filename, $raw);
3547     } else {
3548         unlink $clusterfw_conf_filename;
3549     }
3550 }
3551
3552 sub lock_hostfw_conf {
3553     my ($timeout, $code, @param) = @_;
3554
3555     my $res = PVE::Cluster::cfs_lock_firewall("host-$nodename", $timeout, $code, @param);
3556     die $@ if $@;
3557
3558     return $res;
3559 }
3560
3561 sub load_hostfw_conf {
3562     my ($cluster_conf, $filename) = @_;
3563
3564     $filename = $hostfw_conf_filename if !defined($filename);
3565
3566     my $empty_conf = { rules => [], options => {}};
3567     return generic_fw_config_parser($filename, $cluster_conf, $empty_conf, 'host');
3568 }
3569
3570 sub save_hostfw_conf {
3571     my ($hostfw_conf) = @_;
3572
3573     my $raw = '';
3574
3575     my $options = $hostfw_conf->{options};
3576     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3577
3578     my $rules = $hostfw_conf->{rules};
3579     if ($rules && scalar(@$rules)) {
3580         $raw .= "[RULES]\n\n";
3581         $raw .= &$format_rules($rules, 1);
3582         $raw .= "\n";
3583     }
3584
3585     if ($raw) {
3586         PVE::Tools::file_set_contents($hostfw_conf_filename, $raw);
3587     } else {
3588         unlink $hostfw_conf_filename;
3589     }
3590 }
3591
3592 sub compile {
3593     my ($cluster_conf, $hostfw_conf, $vmdata, $corosync_conf) = @_;
3594
3595     my $vmfw_configs;
3596
3597     # fixme: once we read standard chains from config this needs to be put in test/standard cases below
3598     $pve_std_chains = dclone($pve_std_chains_conf);
3599
3600     if ($vmdata) { # test mode
3601         my $testdir = $vmdata->{testdir} || die "no test directory specified";
3602         my $filename = "$testdir/cluster.fw";
3603         $cluster_conf = load_clusterfw_conf($filename);
3604
3605         $filename = "$testdir/host.fw";
3606         $hostfw_conf = load_hostfw_conf($cluster_conf, $filename);
3607
3608         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, $testdir);
3609     } else { # normal operation
3610         $cluster_conf = load_clusterfw_conf(undef) if !$cluster_conf;
3611
3612         $hostfw_conf = load_hostfw_conf($cluster_conf, undef) if !$hostfw_conf;
3613
3614         # cfs_update is handled by daemon or API
3615         $corosync_conf = PVE::Cluster::cfs_read_file("corosync.conf")
3616             if !defined($corosync_conf) && PVE::Corosync::check_conf_exists(1);
3617
3618         $vmdata = read_local_vm_config();
3619         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, undef);
3620     }
3621
3622     return ({},{},{},{}) if !$cluster_conf->{options}->{enable};
3623
3624     my $localnet;
3625     if ($cluster_conf->{aliases}->{local_network}) {
3626         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3627     } else {
3628         my $localnet_ver;
3629         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3630
3631         $cluster_conf->{aliases}->{local_network} = {
3632             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3633     }
3634
3635     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3636
3637     my $ruleset = {};
3638     my $rulesetv6 = {};
3639     $ruleset->{filter} = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 4);
3640     $ruleset->{raw} = compile_iptables_raw($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 4);
3641     $rulesetv6->{filter} = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 6);
3642     $rulesetv6->{raw} = compile_iptables_raw($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 6);
3643     my $ebtables_ruleset = compile_ebtables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata);
3644     my $ipset_ruleset = compile_ipsets($cluster_conf, $vmfw_configs, $vmdata);
3645
3646     return ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
3647 }
3648
3649 sub compile_iptables_raw {
3650     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, $ipversion) = @_;
3651
3652     my $ruleset = {};
3653
3654     my $hostfw_options = $hostfw_conf->{options} || {};
3655     my $protection_synflood = $hostfw_options->{protection_synflood} || 0;
3656
3657     if($protection_synflood) {
3658
3659         my $protection_synflood_rate = $hostfw_options->{protection_synflood_rate} ? $hostfw_options->{protection_synflood_rate} : 200;
3660         my $protection_synflood_burst = $hostfw_options->{protection_synflood_burst} ? $hostfw_options->{protection_synflood_burst} : 1000;
3661         my $protection_synflood_limit = $hostfw_options->{protection_synflood_limit} ? $hostfw_options->{protection_synflood_limit} : 3000;
3662         my $protection_synflood_expire = $hostfw_options->{nf_conntrack_tcp_timeout_syn_recv} ? $hostfw_options->{nf_conntrack_tcp_timeout_syn_recv} : 60;
3663         $protection_synflood_expire = $protection_synflood_expire * 1000;
3664         my $protection_synflood_mask = $ipversion == 4 ? 32 : 64;
3665
3666         ruleset_create_chain($ruleset, "PVEFW-PREROUTING");
3667         ruleset_addrule($ruleset, "PVEFW-PREROUTING", "-p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m hashlimit --hashlimit-above $protection_synflood_rate/sec --hashlimit-burst $protection_synflood_burst --hashlimit-mode srcip --hashlimit-name syn --hashlimit-htable-size 2097152 --hashlimit-srcmask $protection_synflood_mask --hashlimit-htable-expire $protection_synflood_expire", "-j DROP");
3668     }
3669
3670     return $ruleset;
3671 }
3672
3673 sub compile_iptables_filter {
3674     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, $ipversion) = @_;
3675
3676     my $ruleset = {};
3677
3678     ruleset_create_chain($ruleset, "PVEFW-INPUT");
3679     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
3680
3681     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3682
3683     my $hostfw_options = $hostfw_conf->{options} || {};
3684
3685     # fixme: what log level should we use here?
3686     my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
3687
3688     my $conn_allow_invalid = $hostfw_options->{nf_conntrack_allow_invalid} // 0;
3689     ruleset_chain_add_conn_filters($ruleset, "PVEFW-FORWARD", $conn_allow_invalid, "ACCEPT");
3690
3691     ruleset_create_chain($ruleset, "PVEFW-FWBR-IN");
3692     ruleset_chain_add_input_filters($ruleset, "PVEFW-FWBR-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
3693
3694     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-in fwln+", "-j PVEFW-FWBR-IN");
3695
3696     ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3697     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-out fwln+", "-j PVEFW-FWBR-OUT");
3698
3699     generate_std_chains($ruleset, $hostfw_options, $ipversion);
3700
3701     my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
3702
3703     if ($hostfw_enable) {
3704         eval { enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf, $ipversion, $corosync_conf); };
3705         warn $@ if $@; # just to be sure - should not happen
3706     }
3707
3708     # generate firewall rules for QEMU VMs
3709     foreach my $vmid (sort keys %{$vmdata->{qemu}}) {
3710         eval {
3711             my $conf = $vmdata->{qemu}->{$vmid};
3712             my $vmfw_conf = $vmfw_configs->{$vmid};
3713             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3714
3715             foreach my $netid (sort keys %$conf) {
3716                 next if $netid !~ m/^net(\d+)$/;
3717                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3718                 next if !$net->{firewall};
3719
3720                 my $iface = "tap${vmid}i$1";
3721                 my $macaddr = $net->{macaddr};
3722                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3723                                              $vmfw_conf, $vmid, 'IN', $ipversion);
3724                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3725                                              $vmfw_conf, $vmid, 'OUT', $ipversion);
3726             }
3727         };
3728         warn $@ if $@; # just to be sure - should not happen
3729     }
3730
3731     # generate firewall rules for LXC containers
3732     foreach my $vmid (sort keys %{$vmdata->{lxc}}) {
3733         eval {
3734             my $conf = $vmdata->{lxc}->{$vmid};
3735             my $vmfw_conf = $vmfw_configs->{$vmid};
3736             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3737
3738             foreach my $netid (sort keys %$conf) {
3739                 next if $netid !~ m/^net(\d+)$/;
3740                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3741                 next if !$net->{firewall};
3742
3743                 my $iface = "veth${vmid}i$1";
3744                 my $macaddr = $net->{hwaddr};
3745                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3746                                              $vmfw_conf, $vmid, 'IN', $ipversion);
3747                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3748                                              $vmfw_conf, $vmid, 'OUT', $ipversion);
3749             }
3750         };
3751         warn $@ if $@; # just to be sure - should not happen
3752     }
3753
3754     if (ruleset_chain_exist($ruleset, "PVEFW-IPS")){
3755         ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED", "-j PVEFW-IPS");
3756     }
3757
3758     return $ruleset;
3759 }
3760
3761 sub mac_to_linklocal {
3762     my ($macaddr) = @_;
3763     my @parts = split(/:/, $macaddr);
3764     # The standard link local address uses the fe80::/64 prefix with the
3765     # modified EUI-64 identifier derived from the MAC address by flipping the
3766     # universal/local bit and inserting FF:FE in the middle.
3767     # See RFC 4291.
3768     $parts[0] = sprintf("%02x", hex($parts[0]) ^ 0x02);
3769     my @meui64 = (@parts[0,1,2], 'ff', 'fe', @parts[3,4,5]);
3770     return "fe80::$parts[0]$parts[1]:$parts[2]FF:FE$parts[3]:$parts[4]$parts[5]";
3771 }
3772
3773 sub compile_ipsets {
3774     my ($cluster_conf, $vmfw_configs, $vmdata) = @_;
3775
3776     my $localnet;
3777     if ($cluster_conf->{aliases}->{local_network}) {
3778         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3779     } else {
3780         my $localnet_ver;
3781         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3782
3783         $cluster_conf->{aliases}->{local_network} = {
3784             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3785     }
3786
3787     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3788
3789
3790     my $ipset_ruleset = {};
3791
3792     # generate ipsets for QEMU VMs
3793     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3794         eval {
3795             my $conf = $vmdata->{qemu}->{$vmid};
3796             my $vmfw_conf = $vmfw_configs->{$vmid};
3797             return if !$vmfw_conf;
3798
3799             # When the 'ipfilter' option is enabled every device for which there
3800             # is no 'ipfilter-netX' ipset defiend gets an implicit empty default
3801             # ipset.
3802             # The reason is that ipfilter ipsets are always filled with standard
3803             # IPv6 link-local filters.
3804             my $ipsets = $vmfw_conf->{ipset};
3805             my $implicit_sets = {};
3806
3807             my $device_ips = {};
3808             foreach my $netid (keys %$conf) {
3809                 next if $netid !~ m/^net(\d+)$/;
3810                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3811                 next if !$net->{firewall};
3812
3813                 if ($vmfw_conf->{options}->{ipfilter} && !$ipsets->{"ipfilter-$netid"}) {
3814                     $implicit_sets->{"ipfilter-$netid"} = [];
3815                 }
3816
3817                 my $macaddr = $net->{macaddr};
3818                 my $linklocal = mac_to_linklocal($macaddr);
3819                 $device_ips->{$netid} = [
3820                     { cidr => $linklocal },
3821                     { cidr => 'fe80::/10', nomatch => 1 }
3822                 ];
3823             }
3824
3825             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $ipsets);
3826             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $implicit_sets);
3827         };
3828         warn $@ if $@; # just to be sure - should not happen
3829     }
3830
3831     # generate firewall rules for LXC containers
3832     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3833         eval {
3834             my $conf = $vmdata->{lxc}->{$vmid};
3835             my $vmfw_conf = $vmfw_configs->{$vmid};
3836             return if !$vmfw_conf;
3837
3838             # When the 'ipfilter' option is enabled every device for which there
3839             # is no 'ipfilter-netX' ipset defiend gets an implicit empty default
3840             # ipset.
3841             # The reason is that ipfilter ipsets are always filled with standard
3842             # IPv6 link-local filters, as well as the IP addresses configured
3843             # for the container.
3844             my $ipsets = $vmfw_conf->{ipset};
3845             my $implicit_sets = {};
3846
3847             my $device_ips = {};
3848             foreach my $netid (keys %$conf) {
3849                 next if $netid !~ m/^net(\d+)$/;
3850                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3851                 next if !$net->{firewall};
3852
3853                 if ($vmfw_conf->{options}->{ipfilter} && !$ipsets->{"ipfilter-$netid"}) {
3854                     $implicit_sets->{"ipfilter-$netid"} = [];
3855                 }
3856
3857                 my $macaddr = $net->{hwaddr};
3858                 my $linklocal = mac_to_linklocal($macaddr);
3859                 my $set = $device_ips->{$netid} = [
3860                     { cidr => $linklocal },
3861                     { cidr => 'fe80::/10', nomatch => 1 }
3862                 ];
3863                 if (defined($net->{ip}) && $net->{ip} =~ m!^($IPV4RE)(?:/\d+)?$!) {
3864                     push @$set, { cidr => $1 };
3865                 }
3866                 if (defined($net->{ip6}) && $net->{ip6} =~ m!^($IPV6RE)(?:/\d+)?$!) {
3867                     push @$set, { cidr => $1 };
3868                 }
3869             }
3870
3871             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $ipsets);
3872             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $implicit_sets);
3873         };
3874         warn $@ if $@; # just to be sure - should not happen
3875     }
3876
3877     generate_ipset_chains($ipset_ruleset, undef, $cluster_conf, undef, $cluster_conf->{ipset});
3878
3879     return $ipset_ruleset;
3880 }
3881
3882 sub compile_ebtables_filter {
3883     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata) = @_;
3884
3885     if (!($cluster_conf->{options}->{ebtables} // 1)) {
3886         return {};
3887     }
3888
3889     my $ruleset = {};
3890
3891     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3892
3893     ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3894     #for ipv4 and ipv6, check macaddress in iptables, so we use conntrack 'ESTABLISHED', to speedup rules
3895     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-p IPv4', '-j ACCEPT');
3896     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-p IPv6', '-j ACCEPT');
3897     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-o fwln+', '-j PVEFW-FWBR-OUT');
3898
3899     # generate firewall rules for QEMU VMs
3900     foreach my $vmid (sort keys %{$vmdata->{qemu}}) {
3901         eval {
3902             my $conf = $vmdata->{qemu}->{$vmid};
3903             my $vmfw_conf = $vmfw_configs->{$vmid};
3904             return if !$vmfw_conf;
3905             my $ipsets = $vmfw_conf->{ipset};
3906
3907             foreach my $netid (sort keys %$conf) {
3908                 next if $netid !~ m/^net(\d+)$/;
3909                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3910                 next if !$net->{firewall};
3911                 my $iface = "tap${vmid}i$1";
3912                 my $macaddr = $net->{macaddr};
3913                 my $arpfilter = [];
3914                 if (defined(my $ipset = $ipsets->{"ipfilter-$netid"})) {
3915                     foreach my $ipaddr (@$ipset) {
3916                         my($ip, $version) = parse_ip_or_cidr($ipaddr->{cidr});
3917                         next if !$ip || ($version && $version != 4);
3918                         push(@$arpfilter, $ip);
3919                     }
3920                 }
3921                 generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter);
3922             }
3923         };
3924         warn $@ if $@; # just to be sure - should not happen
3925     }
3926
3927     # generate firewall rules for LXC containers
3928     foreach my $vmid (sort keys %{$vmdata->{lxc}}) {
3929         eval {
3930             my $conf = $vmdata->{lxc}->{$vmid};
3931
3932             my $vmfw_conf = $vmfw_configs->{$vmid};
3933             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3934             my $ipsets = $vmfw_conf->{ipset};
3935
3936             foreach my $netid (sort keys %$conf) {
3937                 next if $netid !~ m/^net(\d+)$/;
3938                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3939                 next if !$net->{firewall};
3940                 my $iface = "veth${vmid}i$1";
3941                 my $macaddr = $net->{hwaddr};
3942                 my $arpfilter = [];
3943                 if (defined(my $ipset = $ipsets->{"ipfilter-$netid"})) {
3944                     foreach my $ipaddr (@$ipset) {
3945                         my($ip, $version) = parse_ip_or_cidr($ipaddr->{cidr});
3946                         next if !$ip || ($version && $version != 4);
3947                         push(@$arpfilter, $ip);
3948                     }
3949                 }
3950                 if (defined(my $ip = $net->{ip}) && $vmfw_conf->{options}->{ipfilter}) {
3951                     # ebtables changes this to a .0/MASK network but we just
3952                     # want the address here, no network - see #2193
3953                     $ip =~ s|/(\d+)$||;
3954                     if ($ip ne 'dhcp') {
3955                         push @$arpfilter, $ip;
3956                     }
3957                 }
3958                 generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter);
3959             }
3960         };
3961         warn $@ if $@; # just to be sure - should not happen
3962     }
3963
3964     return $ruleset;
3965 }
3966
3967 sub generate_tap_layer2filter {
3968     my ($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter) = @_;
3969     my $options = $vmfw_conf->{options};
3970
3971     my $tapchain = $iface."-OUT";
3972
3973     # ebtables remove zeros from mac pairs
3974     $macaddr =~ s/0([0-9a-f])/$1/ig;
3975     $macaddr = lc($macaddr);
3976
3977     ruleset_create_chain($ruleset, $tapchain);
3978
3979     if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
3980             ruleset_addrule($ruleset, $tapchain, "-s ! $macaddr", '-j DROP');
3981     }
3982
3983     if (@$arpfilter){
3984         my $arpchain = $tapchain."-ARP";
3985         ruleset_addrule($ruleset, $tapchain, "-p ARP", "-j $arpchain");
3986         ruleset_create_chain($ruleset, $arpchain);
3987
3988         foreach my $ip (@{$arpfilter}) {
3989             ruleset_addrule($ruleset, $arpchain, "-p ARP --arp-ip-src $ip", '-j RETURN');
3990         }
3991         ruleset_addrule($ruleset, $arpchain, '', '-j DROP');
3992     }
3993
3994     if (defined($options->{layer2_protocols})){
3995         my $protochain = $tapchain."-PROTO";
3996         ruleset_addrule($ruleset, $tapchain, '', "-j $protochain");
3997         ruleset_create_chain($ruleset, $protochain);
3998
3999         foreach my $proto (split(/,/, $options->{layer2_protocols})) {
4000             ruleset_addrule($ruleset, $protochain, "-p $proto", '-j RETURN');
4001         }
4002         ruleset_addrule($ruleset, $protochain, '', '-j DROP');
4003     }
4004
4005     ruleset_addrule($ruleset, $tapchain, '', '-j ACCEPT');
4006
4007     ruleset_addrule($ruleset, 'PVEFW-FWBR-OUT', "-i $iface", "-j $tapchain");
4008 }
4009
4010 # the parameter $change_only_regex changes two things if defined:
4011 # * all chains not matching it will be left intact
4012 # * both the $active_chains hash and the returned status_hash have different
4013 #   structure (they contain a key named 'rules').
4014 sub get_ruleset_status {
4015     my ($ruleset, $active_chains, $digest_fn, $change_only_regex) = @_;
4016
4017     my $statushash = {};
4018
4019     foreach my $chain (sort keys %$ruleset) {
4020         my $rules = $ruleset->{$chain};
4021         my $sig = &$digest_fn($rules);
4022         my $oldsig;
4023
4024         $statushash->{$chain}->{sig} = $sig;
4025         if (defined($change_only_regex)) {
4026             $oldsig = $active_chains->{$chain}->{sig};
4027             $statushash->{$chain}->{rules} = $rules;
4028         } else {
4029             $oldsig = $active_chains->{$chain};
4030         }
4031         if (!defined($oldsig)) {
4032             $statushash->{$chain}->{action} = 'create';
4033         } else {
4034             if ($oldsig eq $sig) {
4035                 $statushash->{$chain}->{action} = 'exists';
4036             } else {
4037                 $statushash->{$chain}->{action} = 'update';
4038             }
4039         }
4040         if ($verbose) {
4041             print "$statushash->{$chain}->{action} $chain ($sig)\n";
4042             foreach my $cmd (@{$rules}) {
4043                 print "\t$cmd\n";
4044             }
4045         }
4046     }
4047
4048     foreach my $chain (sort keys %$active_chains) {
4049         next if defined($ruleset->{$chain});
4050         my $action = 'delete';
4051         my $sig = $active_chains->{$chain};
4052         if (defined($change_only_regex)) {
4053             $action = 'ignore' if ($chain !~ m/$change_only_regex/);
4054             $statushash->{$chain}->{rules} = $active_chains->{$chain}->{rules};
4055             $sig = $sig->{sig};
4056         }
4057         $statushash->{$chain}->{action} = $action;
4058         $statushash->{$chain}->{sig} = $sig;
4059         print "$action $chain ($sig)\n" if $verbose;
4060     }
4061
4062     return $statushash;
4063 }
4064
4065 sub print_sig_rule {
4066     my ($chain, $sig) = @_;
4067
4068     # We just use this to store a SHA1 checksum used to detect changes
4069     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
4070 }
4071
4072 sub get_ruleset_cmdlist {
4073     my ($ruleset, $iptablescmd, $table) = @_;
4074
4075     $table = 'filter' if !$table;
4076
4077     my $cmdlist = "*$table\n"; # we pass this to iptables-restore;
4078
4079     my ($active_chains, $hooks) = iptables_get_chains($iptablescmd, $table);
4080     my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest);
4081
4082     # create missing chains first
4083     foreach my $chain (sort keys %$ruleset) {
4084         my $stat = $statushash->{$chain};
4085         die "internal error" if !$stat;
4086         next if $stat->{action} ne 'create';
4087
4088         $cmdlist .= ":$chain - [0:0]\n";
4089     }
4090
4091     foreach my $h (qw(INPUT OUTPUT FORWARD PREROUTING)) {
4092         my $chain = "PVEFW-$h";
4093         if ($ruleset->{$chain} && !$hooks->{$h}) {
4094             $cmdlist .= "-A $h -j $chain\n";
4095         }
4096     }
4097
4098     foreach my $chain (sort keys %$ruleset) {
4099         my $stat = $statushash->{$chain};
4100         die "internal error" if !$stat;
4101
4102         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
4103             $cmdlist .= "-F $chain\n";
4104             foreach my $cmd (@{$ruleset->{$chain}}) {
4105                 $cmdlist .= "$cmd\n";
4106             }
4107             $cmdlist .= print_sig_rule($chain, $stat->{sig});
4108         } elsif ($stat->{action} eq 'delete') {
4109             die "internal error"; # this should not happen
4110         } elsif ($stat->{action} eq 'exists') {
4111             # do nothing
4112         } else {
4113             die "internal error - unknown status '$stat->{action}'";
4114         }
4115     }
4116
4117     foreach my $chain (keys %$statushash) {
4118         next if $statushash->{$chain}->{action} ne 'delete';
4119         $cmdlist .= "-F $chain\n";
4120     }
4121     foreach my $chain (keys %$statushash) {
4122         next if $statushash->{$chain}->{action} ne 'delete';
4123         next if $chain eq 'PVEFW-INPUT';
4124         next if $chain eq 'PVEFW-OUTPUT';
4125         next if $chain eq 'PVEFW-FORWARD';
4126         next if $chain eq 'PVEFW-PREROUTING';
4127         $cmdlist .= "-X $chain\n";
4128     }
4129
4130     my $changes = $cmdlist ne "*$table\n" ? 1 : 0;
4131
4132     $cmdlist .= "COMMIT\n";
4133
4134     return wantarray ? ($cmdlist, $changes) : $cmdlist;
4135 }
4136
4137 my $pve_ebtables_chainname_regex = qr/PVEFW-\S+|(?:tap|veth)\d+i\d+-(?:IN|OUT)/;
4138
4139 sub get_ebtables_cmdlist {
4140     my ($ruleset) = @_;
4141
4142     my $changes = 0;
4143     my $cmdlist = "*filter\n";
4144
4145     my $active_chains = ebtables_get_chains();
4146     my $statushash = get_ruleset_status($ruleset, $active_chains,
4147                                         \&iptables_chain_digest,
4148                                         $pve_ebtables_chainname_regex);
4149
4150     # create chains first and make sure PVE rules are evaluated if active
4151     my $append_pve_to_forward = '-A FORWARD -j PVEFW-FORWARD';
4152     my $pve_include = 0;
4153     foreach my $chain (sort keys %$statushash) {
4154         next if ($statushash->{$chain}->{action} eq 'delete');
4155         $cmdlist .= ":$chain ACCEPT\n";
4156         $pve_include = 1 if ($chain eq 'PVEFW-FORWARD');
4157     }
4158
4159     foreach my $chain (sort keys %$statushash) {
4160         my $stat = $statushash->{$chain};
4161         $changes = 1 if ($stat->{action} !~ 'ignore|exists');
4162         next if ($stat->{action} eq 'delete');
4163
4164         foreach my $cmd (@{$statushash->{$chain}->{'rules'}}) {
4165             if ($chain eq 'FORWARD' && $cmd eq $append_pve_to_forward) {
4166                 next if ! $pve_include;
4167                 $pve_include = 0;
4168             }
4169             $cmdlist .= "$cmd\n";
4170         }
4171     }
4172     $cmdlist .= "$append_pve_to_forward\n" if $pve_include;
4173
4174     return wantarray ? ($cmdlist, $changes) : $cmdlist;
4175 }
4176
4177 sub get_ipset_cmdlist {
4178     my ($ruleset) = @_;
4179
4180     my $cmdlist = "";
4181
4182     my $delete_cmdlist = "";
4183
4184     my $active_chains = ipset_get_chains();
4185     my $statushash = get_ruleset_status($ruleset, $active_chains, \&ipset_chain_digest);
4186
4187     # remove stale _swap chains
4188     foreach my $chain (keys %$active_chains) {
4189         if ($chain =~ m/^PVEFW-\S+_swap$/) {
4190             $cmdlist .= "destroy $chain\n";
4191         }
4192     }
4193
4194     foreach my $chain (keys %$ruleset) {
4195         my $stat = $statushash->{$chain};
4196         die "internal error" if !$stat;
4197
4198         if ($stat->{action} eq 'create') {
4199             foreach my $cmd (@{$ruleset->{$chain}}) {
4200                 $cmdlist .= "$cmd\n";
4201             }
4202         }
4203     }
4204
4205     foreach my $chain (keys %$ruleset) {
4206         my $stat = $statushash->{$chain};
4207         die "internal error" if !$stat;
4208
4209         if ($stat->{action} eq 'update') {
4210             my $chain_swap = $chain."_swap";
4211
4212             foreach my $cmd (@{$ruleset->{$chain}}) {
4213                 $cmd =~ s/$chain/$chain_swap/;
4214                 $cmdlist .= "$cmd\n";
4215             }
4216             $cmdlist .= "swap $chain_swap $chain\n";
4217             $cmdlist .= "flush $chain_swap\n";
4218             $cmdlist .= "destroy $chain_swap\n";
4219         }
4220     }
4221
4222      # the remove unused chains
4223     foreach my $chain (keys %$statushash) {
4224         next if $statushash->{$chain}->{action} ne 'delete';
4225
4226         $delete_cmdlist .= "flush $chain\n";
4227         $delete_cmdlist .= "destroy $chain\n";
4228     }
4229
4230     my $changes = ($cmdlist || $delete_cmdlist) ? 1 : 0;
4231
4232     return ($cmdlist, $delete_cmdlist, $changes);
4233 }
4234
4235 sub apply_ruleset {
4236     my ($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $ebtables_ruleset) = @_;
4237
4238     enable_bridge_firewall();
4239
4240     my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
4241         get_ipset_cmdlist($ipset_ruleset);
4242
4243     my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset->{filter});
4244     my ($cmdlistv6, $changesv6) = get_ruleset_cmdlist($rulesetv6->{filter}, "ip6tables");
4245     my ($ebtables_cmdlist, $ebtables_changes) = get_ebtables_cmdlist($ebtables_ruleset);
4246     my ($cmdlist_raw, $changes_raw) = get_ruleset_cmdlist($ruleset->{raw}, undef, 'raw');
4247     my ($cmdlistv6_raw, $changesv6_raw) = get_ruleset_cmdlist($rulesetv6->{raw}, "ip6tables", 'raw');
4248
4249     if ($verbose) {
4250         if ($ipset_changes) {
4251             print "ipset changes:\n";
4252             print $ipset_create_cmdlist if $ipset_create_cmdlist;
4253             print $ipset_delete_cmdlist if $ipset_delete_cmdlist;
4254         }
4255
4256         if ($changes) {
4257             print "iptables changes:\n";
4258             print $cmdlist;
4259         }
4260
4261         if ($changesv6) {
4262             print "ip6tables changes:\n";
4263             print $cmdlistv6;
4264         }
4265
4266         if ($changes_raw) {
4267             print "iptables table raw changes:\n";
4268             print $cmdlist_raw;
4269         }
4270
4271         if ($changesv6_raw) {
4272             print "ip6tables table raw changes:\n";
4273             print $cmdlistv6_raw;
4274         }
4275
4276         if ($ebtables_changes) {
4277             print "ebtables changes:\n";
4278             print $ebtables_cmdlist;
4279         }
4280     }
4281
4282     my $tmpfile = "$pve_fw_status_dir/ipsetcmdlist1";
4283     PVE::Tools::file_set_contents($tmpfile, $ipset_create_cmdlist || '');
4284
4285     ipset_restore_cmdlist($ipset_create_cmdlist);
4286
4287     $tmpfile = "$pve_fw_status_dir/ip4cmdlist";
4288     PVE::Tools::file_set_contents($tmpfile, $cmdlist || '');
4289
4290     iptables_restore_cmdlist($cmdlist);
4291
4292     $tmpfile = "$pve_fw_status_dir/ip4cmdlistraw";
4293     PVE::Tools::file_set_contents($tmpfile, $cmdlist_raw || '');
4294
4295     iptables_restore_cmdlist($cmdlist_raw, 'raw');
4296
4297     $tmpfile = "$pve_fw_status_dir/ip6cmdlist";
4298     PVE::Tools::file_set_contents($tmpfile, $cmdlistv6 || '');
4299
4300     ip6tables_restore_cmdlist($cmdlistv6);
4301
4302     $tmpfile = "$pve_fw_status_dir/ip6cmdlistraw";
4303     PVE::Tools::file_set_contents($tmpfile, $cmdlistv6_raw || '');
4304
4305     ip6tables_restore_cmdlist($cmdlistv6_raw, 'raw');
4306
4307     $tmpfile = "$pve_fw_status_dir/ipsetcmdlist2";
4308     PVE::Tools::file_set_contents($tmpfile, $ipset_delete_cmdlist || '');
4309
4310     ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
4311
4312     ebtables_restore_cmdlist($ebtables_cmdlist);
4313
4314     $tmpfile = "$pve_fw_status_dir/ebtablescmdlist";
4315     PVE::Tools::file_set_contents($tmpfile, $ebtables_cmdlist || '');
4316
4317     # test: re-read status and check if everything is up to date
4318     my $ruleset_filter = $ruleset->{filter};
4319     my $active_chains = iptables_get_chains();
4320     my $statushash = get_ruleset_status($ruleset_filter, $active_chains, \&iptables_chain_digest);
4321
4322     my $errors;
4323     foreach my $chain (sort keys %$ruleset_filter) {
4324         my $stat = $statushash->{$chain};
4325         if ($stat->{action} ne 'exists') {
4326             warn "unable to update chain '$chain'\n";
4327             $errors = 1;
4328         }
4329     }
4330
4331     my $rulesetv6_filter = $rulesetv6->{filter};
4332     my $active_chainsv6 = iptables_get_chains("ip6tables");
4333     my $statushashv6 = get_ruleset_status($rulesetv6_filter, $active_chainsv6, \&iptables_chain_digest);
4334
4335     foreach my $chain (sort keys %$rulesetv6_filter) {
4336         my $stat = $statushashv6->{$chain};
4337         if ($stat->{action} ne 'exists') {
4338             warn "unable to update chain '$chain'\n";
4339             $errors = 1;
4340         }
4341     }
4342
4343     my $ruleset_raw = $ruleset->{raw};
4344     my $active_chains_raw = iptables_get_chains(undef, 'raw');
4345     my $statushash_raw = get_ruleset_status($ruleset_raw, $active_chains_raw, \&iptables_chain_digest);
4346
4347     foreach my $chain (sort keys %$ruleset_raw) {
4348         my $stat = $statushash_raw->{$chain};
4349         if ($stat->{action} ne 'exists') {
4350             warn "unable to update chain '$chain'\n";
4351             $errors = 1;
4352         }
4353     }
4354
4355     my $rulesetv6_raw = $rulesetv6->{raw};
4356     my $active_chainsv6_raw = iptables_get_chains("ip6tables", 'raw');
4357     my $statushashv6_raw = get_ruleset_status($rulesetv6_raw, $active_chainsv6_raw, \&iptables_chain_digest);
4358
4359     foreach my $chain (sort keys %$rulesetv6_raw) {
4360         my $stat = $statushashv6_raw->{$chain};
4361         if ($stat->{action} ne 'exists') {
4362             warn "unable to update chain '$chain'\n";
4363             $errors = 1;
4364         }
4365     }
4366
4367     my $active_ebtables_chains = ebtables_get_chains();
4368     my $ebtables_statushash = get_ruleset_status($ebtables_ruleset,
4369                                 $active_ebtables_chains, \&iptables_chain_digest,
4370                                 $pve_ebtables_chainname_regex);
4371
4372     foreach my $chain (sort keys %$ebtables_ruleset) {
4373         my $stat = $ebtables_statushash->{$chain};
4374         if ($stat->{action} ne 'exists') {
4375             warn "ebtables : unable to update chain '$chain'\n";
4376             $errors = 1;
4377         }
4378     }
4379
4380     die "unable to apply firewall changes\n" if $errors;
4381
4382     update_nf_conntrack_max($hostfw_conf);
4383
4384     update_nf_conntrack_tcp_timeout_established($hostfw_conf);
4385
4386     update_nf_conntrack_tcp_timeout_syn_recv($hostfw_conf);
4387
4388     update_nf_conntrack_logging($hostfw_conf);
4389 }
4390
4391 sub update_nf_conntrack_max {
4392     my ($hostfw_conf) = @_;
4393
4394     my $max = 262144; # reasonable default (2^16 * 4), see nf_conntrack-sysctl docs
4395
4396     my $options = $hostfw_conf->{options} || {};
4397
4398     if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
4399         $max = $options->{nf_conntrack_max};
4400         $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
4401     }
4402
4403     my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
4404     my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
4405
4406     my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
4407
4408     if ($current != $max) {
4409         my $hashsize = int($max/4);
4410         PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
4411         PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
4412     }
4413 }
4414
4415 sub update_nf_conntrack_tcp_timeout_established {
4416     my ($hostfw_conf) = @_;
4417
4418     my $options = $hostfw_conf->{options} || {};
4419
4420     my $value = defined($options->{nf_conntrack_tcp_timeout_established}) ? $options->{nf_conntrack_tcp_timeout_established} : 432000;
4421
4422     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established", $value);
4423 }
4424
4425 sub update_nf_conntrack_tcp_timeout_syn_recv {
4426     my ($hostfw_conf) = @_;
4427
4428     my $options = $hostfw_conf->{options} || {};
4429
4430     my $value = defined($options->{nf_conntrack_tcp_timeout_syn_recv}) ? $options->{nf_conntrack_tcp_timeout_syn_recev} : 60;
4431
4432     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_syn_recv", $value);
4433 }
4434
4435 my $log_nf_conntrack_enabled = undef;
4436 sub update_nf_conntrack_logging {
4437     my ($hostfw_conf) = @_;
4438
4439     my $options = $hostfw_conf->{options} || {};
4440     my $value = $options->{log_nf_conntrack} || 0;
4441     if (!defined($log_nf_conntrack_enabled)
4442         || $value != $log_nf_conntrack_enabled)
4443     {
4444         my $tmpfile = "$pve_fw_status_dir/log_nf_conntrack";
4445         PVE::Tools::file_set_contents($tmpfile, $value);
4446
4447         run_command([qw(systemctl try-reload-or-restart pvefw-logger.service)]);
4448         $log_nf_conntrack_enabled = $value;
4449     }
4450 }
4451
4452 sub remove_pvefw_chains {
4453
4454     PVE::Firewall::remove_pvefw_chains_iptables("iptables");
4455     PVE::Firewall::remove_pvefw_chains_iptables("ip6tables");
4456     PVE::Firewall::remove_pvefw_chains_iptables("iptables", "raw");
4457     PVE::Firewall::remove_pvefw_chains_iptables("ip6tables", "raw");
4458     PVE::Firewall::remove_pvefw_chains_ipset();
4459     PVE::Firewall::remove_pvefw_chains_ebtables();
4460
4461 }
4462
4463 sub remove_pvefw_chains_iptables {
4464     my ($iptablescmd, $table) = @_;
4465
4466     $table = 'filter' if !$table;
4467
4468     my ($chash, $hooks) = iptables_get_chains($iptablescmd, $table);
4469     my $cmdlist = "*$table\n";
4470
4471     foreach my $h (qw(INPUT OUTPUT FORWARD PREROUTING)) {
4472         if ($hooks->{$h}) {
4473             $cmdlist .= "-D $h -j PVEFW-$h\n";
4474         }
4475     }
4476
4477     foreach my $chain (keys %$chash) {
4478         $cmdlist .= "-F $chain\n";
4479     }
4480
4481     foreach my $chain (keys %$chash) {
4482         $cmdlist .= "-X $chain\n";
4483     }
4484     $cmdlist .= "COMMIT\n";
4485
4486     if($iptablescmd eq "ip6tables") {
4487         ip6tables_restore_cmdlist($cmdlist, $table);
4488     } else {
4489         iptables_restore_cmdlist($cmdlist, $table);
4490     }
4491 }
4492
4493 sub remove_pvefw_chains_ipset {
4494
4495     my $ipset_chains = ipset_get_chains();
4496
4497     my $cmdlist = "";
4498
4499     foreach my $chain (keys %$ipset_chains) {
4500         $cmdlist .= "flush $chain\n";
4501         $cmdlist .= "destroy $chain\n";
4502     }
4503
4504     ipset_restore_cmdlist($cmdlist) if $cmdlist;
4505 }
4506
4507 sub remove_pvefw_chains_ebtables {
4508     # apply empty ruleset = remove all our chains
4509     ebtables_restore_cmdlist(get_ebtables_cmdlist({}));
4510 }
4511
4512 sub init {
4513     my $cluster_conf = load_clusterfw_conf();
4514     my $cluster_options = $cluster_conf->{options};
4515     my $enable = $cluster_options->{enable};
4516
4517     return if !$enable;
4518
4519     # load required modules here
4520 }
4521
4522 sub update {
4523     my $code = sub {
4524
4525         my $cluster_conf = load_clusterfw_conf();
4526         my $cluster_options = $cluster_conf->{options};
4527
4528         if (!$cluster_options->{enable}) {
4529             PVE::Firewall::remove_pvefw_chains();
4530             return;
4531         }
4532
4533         my $hostfw_conf = load_hostfw_conf($cluster_conf);
4534
4535         my ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset) = compile($cluster_conf, $hostfw_conf);
4536
4537         apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
4538     };
4539
4540     run_locked($code);
4541 }
4542
4543 1;