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 Daemons)",
 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 key server 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 some 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 some 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     'destination-unreachable' => 1,
 789     'no-route' => 1,
 790     'communication-prohibited' => 1,
 791     'beyond-scope' => 1,
 792     'address-unreachable' => 1,
 793     'port-unreachable' => 1,
 794     'failed-policy' => 1,
 795     'reject-route' => 1,
 796     'packet-too-big' => 1,
 797     'time-exceeded' => 1,
 798     'ttl-zero-during-transit' => 1,
 799     'ttl-zero-during-reassembly' => 1,
 800     'parameter-problem' => 1,
 801     'bad-header' => 1,
 802     'unknown-header-type' => 1,
 803     'unknown-option' => 1,
 804     'echo-request' => 1,
 805     'echo-reply' => 1,
 806     'router-solicitation' => 1,
 807     'router-advertisement' => 1,
 808     'neighbor-solicitation' => 1,
 809     'neighbour-solicitation' => 1,
 810     'neighbor-advertisement' => 1,
 811     'neighbour-advertisement' => 1,
 812     'redirect' => 1,
 813 };
 814
 815 my $is_valid_icmp_type = sub {
 816     my ($type, $valid_types) = @_;
 817
 818     if ($type =~ m/^\d+$/) {
 819         # values for icmp-type range between 0 and 255 (8 bit field)
 820         die "invalid icmp-type '$type'\n" if $type > 255;
 821     } else {
 822         die "unknown icmp-type '$type'\n" if !defined($valid_types->{$type});
 823     }
 824 };
 825
 826 sub init_firewall_macros {
 827
 828     $pve_fw_parsed_macros = {};
 829
 830     my $parse = sub {
 831         my ($k, $macro) = @_;
 832         my $lc_name = lc($k);
 833         $pve_fw_macro_ipversion->{$k} = 0;
 834         while (!ref($macro->[0])) {
 835             my $desc = shift @$macro;
 836             if ($desc eq 'ipv4only') {
 837                 $pve_fw_macro_ipversion->{$k} = 4;
 838             } elsif ($desc eq 'ipv6only') {
 839                 $pve_fw_macro_ipversion->{$k} = 6;
 840             } else {
 841                 $pve_fw_macro_descr->{$k} = $desc;
 842             }
 843         }
 844         $pve_fw_preferred_macro_names->{$lc_name} = $k;
 845         $pve_fw_parsed_macros->{$k} = $macro;
 846     };
 847
 848     foreach my $k (keys %$pve_fw_macros) {
 849         &$parse($k, $pve_fw_macros->{$k});
 850     }
 851
 852     foreach my $k (keys %$pve_ipv6fw_macros) {
 853         next if $pve_fw_parsed_macros->{$k};
 854         &$parse($k, $pve_ipv6fw_macros->{$k});
 855         $pve_fw_macro_ipversion->{$k} = 6;
 856     }
 857 }
 858
 859 init_firewall_macros();
 860
 861 sub get_macros {
 862     return wantarray ? ($pve_fw_parsed_macros, $pve_fw_macro_descr): $pve_fw_parsed_macros;
 863 }
 864
 865 my $etc_services;
 866
 867 sub get_etc_services {
 868
 869     return $etc_services if $etc_services;
 870
 871     my $filename = "/etc/services";
 872
 873     my $fh = IO::File->new($filename, O_RDONLY);
 874     if (!$fh) {
 875         warn "unable to read '$filename' - $!\n";
 876         return {};
 877     }
 878
 879     my $services = {};
 880
 881     while (my $line = <$fh>) {
 882         chomp ($line);
 883         next if $line =~m/^#/;
 884         next if ($line =~m/^\s*$/);
 885
 886         if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp|sctp).*$!) {
 887             $services->{byid}->{$2}->{name} = $1;
 888             $services->{byid}->{$2}->{port} = $2;
 889             $services->{byid}->{$2}->{$3} = 1;
 890             $services->{byname}->{$1} = $services->{byid}->{$2};
 891         }
 892     }
 893
 894     close($fh);
 895
 896     $etc_services = $services;
 897
 898
 899     return $etc_services;
 900 }
 901
 902 sub parse_protocol_file {
 903     my ($filename) = @_;
 904
 905     my $fh = IO::File->new($filename, O_RDONLY);
 906     if (!$fh) {
 907         warn "unable to read '$filename' - $!\n";
 908         return {};
 909     }
 910
 911     my $protocols = {};
 912
 913     while (my $line = <$fh>) {
 914         chomp ($line);
 915         next if $line =~m/^#/;
 916         next if ($line =~m/^\s*$/);
 917
 918         if ($line =~ m!^(\S+)\s+(\d+)(?:\s+.*)?$!) {
 919             $protocols->{byid}->{$2}->{name} = $1;
 920             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
 921         }
 922     }
 923
 924     close($fh);
 925
 926     return $protocols;
 927 }
 928
 929 my $etc_protocols;
 930
 931 sub get_etc_protocols {
 932     return $etc_protocols if $etc_protocols;
 933
 934     my $protocols = parse_protocol_file('/etc/protocols');
 935
 936     # add special case for ICMP v6
 937     $protocols->{byid}->{icmpv6}->{name} = "icmpv6";
 938     $protocols->{byname}->{icmpv6} = $protocols->{byid}->{icmpv6};
 939
 940     $etc_protocols = $protocols;
 941
 942     return $etc_protocols;
 943 }
 944
 945 my $etc_ethertypes;
 946
 947 sub get_etc_ethertypes {
 948     $etc_ethertypes = parse_protocol_file('/etc/ethertypes')
 949         if !$etc_ethertypes;
 950     return $etc_ethertypes;
 951 }
 952
 953 my $__local_network;
 954
 955 sub local_network {
 956     my ($new_value) = @_;
 957
 958     $__local_network = $new_value if defined($new_value);
 959
 960     return $__local_network if defined($__local_network);
 961
 962     eval {
 963         my $nodename = PVE::INotify::nodename();
 964
 965         my $ip = PVE::Cluster::remote_node_ip($nodename);
 966
 967         my $testip = Net::IP->new($ip);
 968
 969         my $isv6 = $testip->version == 6;
 970         my $routes = $isv6 ? PVE::ProcFSTools::read_proc_net_ipv6_route()
 971                            : PVE::ProcFSTools::read_proc_net_route();
 972         foreach my $entry (@$routes) {
 973             my $mask;
 974             if ($isv6) {
 975                 $mask = $entry->{prefix};
 976                 next if !$mask; # skip the default route...
 977             } else {
 978                 $mask = $PVE::Network::ipv4_mask_hash_localnet->{$entry->{mask}};
 979                 next if !defined($mask);
 980             }
 981             my $cidr = "$entry->{dest}/$mask";
 982             my $testnet = Net::IP->new($cidr);
 983             my $overlap = $testnet->overlaps($testip);
 984             if ($overlap == $Net::IP::IP_B_IN_A_OVERLAP ||
 985                 $overlap == $Net::IP::IP_IDENTICAL)
 986             {
 987                 $__local_network = $cidr;
 988                 return;
 989             }
 990         }
 991     };
 992     warn $@ if $@;
 993
 994     return $__local_network;
 995 }
 996
 997 # ipset names are limited to 31 characters,
 998 # and we use '-v4' or '-v6' to indicate IP versions,
 999 # and we use '_swap' suffix for atomic update,
1000 # for example PVEFW-${VMID}-${ipset_name}_swap
1001
1002 my $max_iptables_ipset_name_length = 31 - length("PVEFW-") - length("_swap");
1003
1004 sub compute_ipset_chain_name {
1005     my ($vmid, $ipset_name, $ipversion) = @_;
1006
1007     $vmid = 0 if !defined($vmid);
1008
1009     my $id = "$vmid-${ipset_name}-v$ipversion";
1010
1011     if (length($id) > $max_iptables_ipset_name_length) {
1012         $id = PVE::Tools::fnv31a_hex($id);
1013     }
1014
1015     return "PVEFW-$id";
1016 }
1017
1018 sub compute_ipfilter_ipset_name {
1019     my ($iface) = @_;
1020
1021     return "ipfilter-$iface";
1022 }
1023
1024 sub parse_address_list {
1025     my ($str) = @_;
1026
1027     if ($str =~ m/^(\+)(\S+)$/) { # ipset ref
1028         die "ipset name too long\n" if length($str) > ($max_ipset_name_length + 1);
1029         return;
1030     }
1031
1032     if ($str =~ m/^${ip_alias_pattern}$/) {
1033         die "alias name too long\n" if length($str) > $max_alias_name_length;
1034         return;
1035     }
1036
1037     my $count = 0;
1038     my $iprange = 0;
1039     my $ipversion;
1040
1041     my @elements = split(/,/, $str);
1042     die "extraneous commas in list\n" if $str ne join(',', @elements);
1043     foreach my $elem (@elements) {
1044         $count++;
1045         my $ip = Net::IP->new($elem);
1046         if (!$ip) {
1047             my $err = Net::IP::Error();
1048             die "invalid IP address: $err\n";
1049         }
1050         $iprange = 1 if $elem =~ m/-/;
1051
1052         my $new_ipversion = Net::IP::ip_is_ipv6($ip->ip()) ? 6 : 4;
1053
1054         die "detected mixed ipv4/ipv6 addresses in address list '$str'\n"
1055             if $ipversion && ($new_ipversion != $ipversion);
1056
1057         $ipversion = $new_ipversion;
1058     }
1059
1060     die "you can't use a range in a list\n" if $iprange && $count > 1;
1061
1062     return $ipversion;
1063 }
1064
1065 sub parse_port_name_number_or_range {
1066     my ($str, $dport) = @_;
1067
1068     my $services = PVE::Firewall::get_etc_services();
1069     my $count = 0;
1070     my $icmp_port = 0;
1071
1072     my @elements = split(/,/, $str);
1073     die "extraneous commas in list\n" if $str ne join(',', @elements);
1074     foreach my $item (@elements) {
1075         if ($item =~ m/^([0-9]+):([0-9]+)$/) {
1076             $count += 2;
1077             my ($port1, $port2) = ($1, $2);
1078             die "invalid port '$port1'\n" if $port1 > 65535;
1079             die "invalid port '$port2'\n" if $port2 > 65535;
1080             die "backwards range '$port1:$port2' not allowed, did you mean '$port2:$port1'?\n" if $port1 > $port2;
1081         } elsif ($item =~ m/^([0-9]+)$/) {
1082             $count += 1;
1083             my $port = $1;
1084             die "invalid port '$port'\n" if $port > 65535;
1085         } else {
1086             if ($dport && $icmp_type_names->{$item}) {
1087                 $icmp_port = 1;
1088             } elsif ($dport && $icmpv6_type_names->{$item}) {
1089                 $icmp_port = 1;
1090             } else {
1091                 die "invalid port '$item'\n" if !$services->{byname}->{$item};
1092             }
1093         }
1094     }
1095
1096     die "ICMP ports not allowed in port range\n" if $icmp_port && $count > 0;
1097
1098     # I really don't like to use the word number here, but it's the only thing
1099     # that makes sense in a literal way. The range 1:100 counts as 2, not as
1100     # one and not as 100...
1101     die "too many entries in port list (> 15 numbers)\n"
1102         if $count > 15;
1103
1104     return (scalar(@elements) > 1);
1105 }
1106
1107 PVE::JSONSchema::register_format('pve-fw-sport-spec', \&pve_fw_verify_sport_spec);
1108 sub pve_fw_verify_sport_spec {
1109    my ($portstr) = @_;
1110
1111    parse_port_name_number_or_range($portstr, 0);
1112
1113    return $portstr;
1114 }
1115
1116 PVE::JSONSchema::register_format('pve-fw-dport-spec', \&pve_fw_verify_dport_spec);
1117 sub pve_fw_verify_dport_spec {
1118    my ($portstr) = @_;
1119
1120    parse_port_name_number_or_range($portstr, 1);
1121
1122    return $portstr;
1123 }
1124
1125 PVE::JSONSchema::register_format('pve-fw-addr-spec', \&pve_fw_verify_addr_spec);
1126 sub pve_fw_verify_addr_spec {
1127    my ($list) = @_;
1128
1129    parse_address_list($list);
1130
1131    return $list;
1132 }
1133
1134 PVE::JSONSchema::register_format('pve-fw-protocol-spec', \&pve_fw_verify_protocol_spec);
1135 sub pve_fw_verify_protocol_spec {
1136    my ($proto) = @_;
1137
1138    my $protocols = get_etc_protocols();
1139
1140    die "unknown protocol '$proto'\n" if $proto &&
1141        !(defined($protocols->{byname}->{$proto}) ||
1142          defined($protocols->{byid}->{$proto}));
1143
1144    return $proto;
1145 }
1146
1147 PVE::JSONSchema::register_format('pve-fw-icmp-type-spec', \&pve_fw_verify_icmp_type_spec);
1148 sub pve_fw_verify_icmp_type_spec {
1149     my ($icmp_type) = @_;
1150
1151     if ($icmp_type_names->{$icmp_type} ||  $icmpv6_type_names->{$icmp_type}) {
1152         return $icmp_type;
1153     }
1154
1155     die "invalid icmp-type value '$icmp_type'\n" if $icmp_type ne '';
1156
1157     return $icmp_type;
1158 }
1159
1160
1161 # helper function for API
1162
1163 sub copy_opject_with_digest {
1164     my ($object) = @_;
1165
1166     my $sha = Digest::SHA->new('sha1');
1167
1168     my $res = {};
1169     foreach my $k (sort keys %$object) {
1170         my $v = $object->{$k};
1171         next if !defined($v);
1172         $res->{$k} = $v;
1173         $sha->add($k, ':', $v, "\n");
1174     }
1175
1176     my $digest = $sha->hexdigest;
1177
1178     $res->{digest} = $digest;
1179
1180     return wantarray ? ($res, $digest) : $res;
1181 }
1182
1183 sub copy_list_with_digest {
1184     my ($list) = @_;
1185
1186     my $sha = Digest::SHA->new('sha1');
1187
1188     my $res = [];
1189     foreach my $entry (@$list) {
1190         my $data = {};
1191         foreach my $k (sort keys %$entry) {
1192             my $v = $entry->{$k};
1193             next if !defined($v);
1194             $data->{$k} = $v;
1195             # Note: digest ignores refs ($rule->{errors})
1196             # since Digest::SHA expects a series of bytes,
1197             #  we have to encode the value here to prevent errors when
1198             #  using utf8 characters (eg. in comments)
1199             $sha->add($k, ':', encode_utf8($v), "\n") if !ref($v); ;
1200         }
1201         push @$res, $data;
1202     }
1203
1204     my $digest = $sha->hexdigest;
1205
1206     foreach my $entry (@$res) {
1207         $entry->{digest} = $digest;
1208     }
1209
1210     return wantarray ? ($res, $digest) : $res;
1211 }
1212
1213 our $cluster_option_properties = {
1214     enable => {
1215         description => "Enable or disable the firewall cluster wide.",
1216         type => 'integer',
1217         minimum => 0,
1218         optional => 1,
1219     },
1220     ebtables => {
1221         description => "Enable ebtables rules cluster wide.",
1222         type => 'boolean',
1223         default => 1,
1224         optional => 1,
1225     },
1226     policy_in => {
1227         description => "Input policy.",
1228         type => 'string',
1229         optional => 1,
1230         enum => ['ACCEPT', 'REJECT', 'DROP'],
1231     },
1232     policy_out => {
1233         description => "Output policy.",
1234         type => 'string',
1235         optional => 1,
1236         enum => ['ACCEPT', 'REJECT', 'DROP'],
1237     },
1238     log_ratelimit => {
1239         description => "Log ratelimiting settings",
1240         type => 'string', format => {
1241             enable => {
1242                 default_key => 1,
1243                 description => 'Enable or disable log rate limiting',
1244                 type => 'boolean',
1245                 default => '1',
1246             },
1247             rate => {
1248                 type => 'string',
1249                 description => 'Frequency with which the burst bucket gets refilled',
1250                 optional => 1,
1251                 pattern => '[1-9][0-9]*\/(second|minute|hour|day)',
1252                 format_description => 'rate',
1253                 default => '1/second',
1254             },
1255             burst => {
1256                 type => 'integer',
1257                 minimum => 0,
1258                 optional => 1,
1259                 description => 'Initial burst of packages which will always get logged before the rate is applied',
1260                 default => 5,
1261             },
1262         },
1263         optional => 1,
1264     },
1265 };
1266
1267 our $host_option_properties = {
1268     enable => {
1269         description => "Enable host firewall rules.",
1270         type => 'boolean',
1271         optional => 1,
1272     },
1273     log_level_in =>  get_standard_option('pve-fw-loglevel', {
1274         description => "Log level for incoming traffic." }),
1275     log_level_out =>  get_standard_option('pve-fw-loglevel', {
1276         description => "Log level for outgoing traffic." }),
1277     tcp_flags_log_level =>  get_standard_option('pve-fw-loglevel', {
1278         description => "Log level for illegal tcp flags filter." }),
1279     smurf_log_level =>  get_standard_option('pve-fw-loglevel', {
1280         description => "Log level for SMURFS filter." }),
1281     nosmurfs => {
1282         description => "Enable SMURFS filter.",
1283         type => 'boolean',
1284         optional => 1,
1285     },
1286     tcpflags => {
1287         description => "Filter illegal combinations of TCP flags.",
1288         type => 'boolean',
1289         default => 0,
1290         optional => 1,
1291     },
1292     nf_conntrack_max => {
1293         description => "Maximum number of tracked connections.",
1294         type => 'integer',
1295         optional => 1,
1296         default => 262144,
1297         minimum => 32768,
1298     },
1299     nf_conntrack_tcp_timeout_established => {
1300         description => "Conntrack established timeout.",
1301         type => 'integer',
1302         optional => 1,
1303         default => 432000,
1304         minimum => 7875,
1305     },
1306     nf_conntrack_tcp_timeout_syn_recv => {
1307         description => "Conntrack syn recv timeout.",
1308         type => 'integer',
1309         optional => 1,
1310         default => 60,
1311         minimum => 30,
1312         maximum => 60,
1313     },
1314     ndp => {
1315         description => "Enable NDP (Neighbor Discovery Protocol).",
1316         type => 'boolean',
1317         default => 0,
1318         optional => 1,
1319     },
1320     nf_conntrack_allow_invalid => {
1321         description => "Allow invalid packets on connection tracking.",
1322         type => 'boolean',
1323         default => 0,
1324         optional => 1,
1325     },
1326     protection_synflood => {
1327         description => "Enable synflood protection",
1328         type => 'boolean',
1329         default => 0,
1330         optional => 1,
1331     },
1332     protection_synflood_rate => {
1333         description => "Synflood protection rate syn/sec by ip src.",
1334         type => 'integer',
1335         optional => 1,
1336         default => 200,
1337     },
1338     protection_synflood_burst => {
1339         description => "Synflood protection rate burst by ip src.",
1340         type => 'integer',
1341         optional => 1,
1342         default => 1000,
1343     },
1344     log_nf_conntrack => {
1345         description => "Enable logging of conntrack information.",
1346         type => 'boolean',
1347         default => 0,
1348         optional => 1
1349     },
1350 };
1351
1352 our $vm_option_properties = {
1353     enable => {
1354         description => "Enable/disable firewall rules.",
1355         type => 'boolean',
1356         default => 0,
1357         optional => 1,
1358     },
1359     macfilter => {
1360         description => "Enable/disable MAC address filter.",
1361         type => 'boolean',
1362         default => 0,
1363         optional => 1,
1364     },
1365     dhcp => {
1366         description => "Enable DHCP.",
1367         type => 'boolean',
1368         default => 0,
1369         optional => 1,
1370     },
1371     ndp => {
1372         description => "Enable NDP (Neighbor Discovery Protocol).",
1373         type => 'boolean',
1374         default => 0,
1375         optional => 1,
1376     },
1377     radv => {
1378         description => "Allow sending Router Advertisement.",
1379         type => 'boolean',
1380         optional => 1,
1381     },
1382     ipfilter => {
1383         description => "Enable default IP filters. " .
1384            "This is equivalent to adding an empty ipfilter-net<id> ipset " .
1385            "for every interface. Such ipsets implicitly contain sane default " .
1386            "restrictions such as restricting IPv6 link local addresses to " .
1387            "the one derived from the interface's MAC address. For containers " .
1388            "the configured IP addresses will be implicitly added.",
1389         type => 'boolean',
1390         optional => 1,
1391     },
1392     policy_in => {
1393         description => "Input policy.",
1394         type => 'string',
1395         optional => 1,
1396         enum => ['ACCEPT', 'REJECT', 'DROP'],
1397     },
1398     policy_out => {
1399         description => "Output policy.",
1400         type => 'string',
1401         optional => 1,
1402         enum => ['ACCEPT', 'REJECT', 'DROP'],
1403     },
1404     log_level_in =>  get_standard_option('pve-fw-loglevel', {
1405         description => "Log level for incoming traffic." }),
1406     log_level_out =>  get_standard_option('pve-fw-loglevel', {
1407         description => "Log level for outgoing traffic." }),
1408
1409 };
1410
1411
1412 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.";
1413
1414 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.";
1415
1416 my $rule_properties = {
1417     pos => {
1418         description => "Update rule at position <pos>.",
1419         type => 'integer',
1420         minimum => 0,
1421         optional => 1,
1422     },
1423     digest => get_standard_option('pve-config-digest'),
1424     type => {
1425         description => "Rule type.",
1426         type => 'string',
1427         optional => 1,
1428         enum => ['in', 'out', 'group'],
1429     },
1430     action => {
1431         description => "Rule action ('ACCEPT', 'DROP', 'REJECT') or security group name.",
1432         type => 'string',
1433         optional => 1,
1434         pattern => $security_group_name_pattern,
1435         maxLength => 20,
1436         minLength => 2,
1437     },
1438     macro => {
1439         description => "Use predefined standard macro.",
1440         type => 'string',
1441         optional => 1,
1442         maxLength => 128,
1443     },
1444     iface => get_standard_option('pve-iface', {
1445         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.",
1446         optional => 1
1447     }),
1448     source => {
1449         description => "Restrict packet source address. $addr_list_descr",
1450         type => 'string', format => 'pve-fw-addr-spec',
1451         optional => 1,
1452     },
1453     dest => {
1454         description => "Restrict packet destination address. $addr_list_descr",
1455         type => 'string', format => 'pve-fw-addr-spec',
1456         optional => 1,
1457     },
1458     proto => {
1459         description => "IP protocol. You can use protocol names ('tcp'/'udp') or simple numbers, as defined in '/etc/protocols'.",
1460         type => 'string', format => 'pve-fw-protocol-spec',
1461         optional => 1,
1462     },
1463     enable => {
1464         description => "Flag to enable/disable a rule.",
1465         type => 'integer',
1466         minimum => 0,
1467         optional => 1,
1468     },
1469     log => get_standard_option('pve-fw-loglevel', {
1470         description => "Log level for firewall rule.",
1471     }),
1472     sport => {
1473         description => "Restrict TCP/UDP source port. $port_descr",
1474         type => 'string', format => 'pve-fw-sport-spec',
1475         optional => 1,
1476     },
1477     dport => {
1478         description => "Restrict TCP/UDP destination port. $port_descr",
1479         type => 'string', format => 'pve-fw-dport-spec',
1480         optional => 1,
1481     },
1482     comment => {
1483         description => "Descriptive comment.",
1484         type => 'string',
1485         optional => 1,
1486     },
1487     'icmp-type' => {
1488         description => "Specify icmp-type. Only valid if proto equals 'icmp'.",
1489         type => 'string', format => 'pve-fw-icmp-type-spec',
1490         optional => 1,
1491     },
1492 };
1493
1494 sub add_rule_properties {
1495     my ($properties) = @_;
1496
1497     foreach my $k (keys %$rule_properties) {
1498         my $h = $rule_properties->{$k};
1499         # copy data, so that we can modify later without side effects
1500         foreach my $opt (keys %$h) { $properties->{$k}->{$opt} = $h->{$opt}; }
1501     }
1502
1503     return $properties;
1504 }
1505
1506 sub delete_rule_properties {
1507     my ($rule, $delete_str) = @_;
1508
1509     foreach my $opt (PVE::Tools::split_list($delete_str)) {
1510         raise_param_exc({ 'delete' => "no such property ('$opt')"})
1511             if !defined($rule_properties->{$opt});
1512         raise_param_exc({ 'delete' => "unable to delete required property '$opt'"})
1513             if $opt eq 'type' || $opt eq 'action';
1514         delete $rule->{$opt};
1515     }
1516
1517     return $rule;
1518 }
1519
1520 my $apply_macro = sub {
1521     my ($macro_name, $param, $verify, $ipversion) = @_;
1522
1523     my $macro_rules = $pve_fw_parsed_macros->{$macro_name};
1524     die "unknown macro '$macro_name'\n" if !$macro_rules; # should not happen
1525
1526     if ($ipversion && ($ipversion == 6) && $pve_ipv6fw_macros->{$macro_name}) {
1527         $macro_rules = $pve_ipv6fw_macros->{$macro_name};
1528     }
1529
1530     # skip macros which are specific to another ipversion
1531     if ($ipversion && (my $required = $pve_fw_macro_ipversion->{$macro_name})) {
1532         return if $ipversion != $required;
1533     }
1534
1535     my $rules = [];
1536
1537     foreach my $templ (@$macro_rules) {
1538         my $rule = {};
1539         my $param_used = {};
1540         foreach my $k (keys %$templ) {
1541             my $v = $templ->{$k};
1542             if ($v eq 'PARAM') {
1543                 $v = $param->{$k};
1544                 $param_used->{$k} = 1;
1545             } elsif ($v eq 'DEST') {
1546                 $v = $param->{dest};
1547                 $param_used->{dest} = 1;
1548             } elsif ($v eq 'SOURCE') {
1549                 $v = $param->{source};
1550                 $param_used->{source} = 1;
1551             }
1552
1553             if (!defined($v)) {
1554                 my $msg = "missing parameter '$k' in macro '$macro_name'";
1555                 raise_param_exc({ macro => $msg }) if $verify;
1556                 die "$msg\n";
1557             }
1558             $rule->{$k} = $v;
1559         }
1560         foreach my $k (keys %$param) {
1561             next if $k eq 'macro';
1562             next if !defined($param->{$k});
1563             next if $param_used->{$k};
1564             if (defined($rule->{$k})) {
1565                 if ($rule->{$k} ne $param->{$k}) {
1566                     my $msg = "parameter '$k' already define in macro (value = '$rule->{$k}')";
1567                     raise_param_exc({ $k => $msg }) if $verify;
1568                     die "$msg\n";
1569                 }
1570             } else {
1571                 $rule->{$k} = $param->{$k};
1572             }
1573         }
1574         push @$rules, $rule;
1575     }
1576
1577     return $rules;
1578 };
1579
1580 my $rule_env_iface_lookup = {
1581     'ct' => 1,
1582     'vm' => 1,
1583     'group' => 0,
1584     'cluster' => 1,
1585     'host' => 1,
1586 };
1587
1588 sub verify_rule {
1589     my ($rule, $cluster_conf, $fw_conf, $rule_env, $noerr) = @_;
1590
1591     my $allow_groups = $rule_env eq 'group' ? 0 : 1;
1592
1593     my $allow_iface = $rule_env_iface_lookup->{$rule_env};
1594     die "unknown rule_env '$rule_env'\n" if !defined($allow_iface); # should not happen
1595
1596     my $errors = $rule->{errors} || {};
1597
1598     my $error_count = 0;
1599
1600     my $add_error = sub {
1601         my ($param, $msg)  = @_;
1602         chomp $msg;
1603         raise_param_exc({ $param => $msg }) if !$noerr;
1604         $error_count++;
1605         $errors->{$param} = $msg if !$errors->{$param};
1606     };
1607
1608     my $ipversion;
1609     my $set_ip_version = sub {
1610         my $vers = shift;
1611         if ($vers) {
1612             die "detected mixed ipv4/ipv6 addresses in rule\n"
1613                 if $ipversion && ($vers != $ipversion);
1614             $ipversion = $vers;
1615         }
1616     };
1617
1618     my $check_ipset_or_alias_property = sub {
1619         my ($name, $expected_ipversion) = @_;
1620
1621         if (my $value = $rule->{$name}) {
1622             if ($value =~ m/^\+/) {
1623                 if ($value =~ m/^\+(${ipset_name_pattern})$/) {
1624                     &$add_error($name, "no such ipset '$1'")
1625                         if !($cluster_conf->{ipset}->{$1} || ($fw_conf && $fw_conf->{ipset}->{$1}));
1626
1627                 } else {
1628                     &$add_error($name, "invalid ipset name '$value'");
1629                 }
1630             } elsif ($value =~ m/^${ip_alias_pattern}$/){
1631                 my $alias = lc($value);
1632                 &$add_error($name, "no such alias '$value'")
1633                     if !($cluster_conf->{aliases}->{$alias} || ($fw_conf && $fw_conf->{aliases}->{$alias}));
1634                 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1635                 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1636
1637                 &$set_ip_version($e->{ipversion});
1638             }
1639         }
1640     };
1641
1642     my $type = $rule->{type};
1643     my $action = $rule->{action};
1644
1645     &$add_error('type', "missing property") if !$type;
1646     &$add_error('action', "missing property") if !$action;
1647
1648     if ($type) {
1649         if ($type eq  'in' || $type eq 'out') {
1650             &$add_error('action', "unknown action '$action'")
1651                 if $action && ($action !~ m/^(ACCEPT|DROP|REJECT)$/);
1652         } elsif ($type eq 'group') {
1653             &$add_error('type', "security groups not allowed")
1654                 if !$allow_groups;
1655             &$add_error('action', "invalid characters in security group name")
1656                 if $action && ($action !~ m/^${security_group_name_pattern}$/);
1657         } else {
1658             &$add_error('type', "unknown rule type '$type'");
1659         }
1660     }
1661
1662     if ($rule->{iface}) {
1663         &$add_error('type', "parameter -i not allowed for this rule type")
1664             if !$allow_iface;
1665         eval { PVE::JSONSchema::pve_verify_iface($rule->{iface}); };
1666         &$add_error('iface', $@) if $@;
1667         if ($rule_env eq 'vm' || $rule_env eq 'ct') {
1668             &$add_error('iface', "value does not match the regex pattern 'net\\d+'")
1669                 if $rule->{iface} !~  m/^net(\d+)$/;
1670         }
1671     }
1672
1673     if ($rule->{macro}) {
1674         if (my $preferred_name = $pve_fw_preferred_macro_names->{lc($rule->{macro})}) {
1675             $rule->{macro} = $preferred_name;
1676         } else {
1677             &$add_error('macro', "unknown macro '$rule->{macro}'");
1678         }
1679     }
1680
1681     if ($rule->{proto}) {
1682         eval { pve_fw_verify_protocol_spec($rule->{proto}); };
1683         &$add_error('proto', $@) if $@;
1684         &$set_ip_version(4) if $rule->{proto} eq 'icmp';
1685         &$set_ip_version(6) if $rule->{proto} eq 'icmpv6';
1686         &$set_ip_version(6) if $rule->{proto} eq 'ipv6-icmp';
1687     }
1688
1689     if ($rule->{dport}) {
1690         eval { parse_port_name_number_or_range($rule->{dport}, 1); };
1691         &$add_error('dport', $@) if $@;
1692         my $proto = $rule->{proto};
1693         &$add_error('proto', "missing property - 'dport' requires this property")
1694             if !$proto;
1695         &$add_error('dport', "protocol '$proto' does not support ports")
1696             if !$PROTOCOLS_WITH_PORTS->{$proto} &&
1697                 $proto ne 'icmp' && $proto ne 'icmpv6'; # special cases
1698     }
1699
1700     if (my $icmp_type = $rule ->{'icmp-type'}) {
1701         my $proto = $rule->{proto};
1702         &$add_error('proto', "missing property - 'icmp-type' requires this property")
1703             if $proto ne 'icmp' && $proto ne 'icmpv6' && $proto ne 'ipv6-icmp';
1704         &$add_error('icmp-type', "'icmp-type' cannot be specified together with 'dport'")
1705             if $rule->{dport};
1706         if ($proto eq 'icmp' && !$icmp_type_names->{$icmp_type}) {
1707             &$add_error('icmp-type', "invalid icmp-type '$icmp_type' for proto 'icmp'");
1708         } elsif (($proto eq 'icmpv6' || $proto eq 'ipv6-icmp') && !$icmpv6_type_names->{$icmp_type}) {
1709             &$add_error('icmp-type', "invalid icmp-type '$icmp_type' for proto '$proto'");
1710         }
1711     }
1712
1713     if ($rule->{sport}) {
1714         eval { parse_port_name_number_or_range($rule->{sport}, 0); };
1715         &$add_error('sport', $@) if $@;
1716         my $proto = $rule->{proto};
1717         &$add_error('proto', "missing property - 'sport' requires this property")
1718             if !$proto;
1719         &$add_error('sport', "protocol '$proto' does not support ports")
1720             if !$PROTOCOLS_WITH_PORTS->{$proto};
1721     }
1722
1723     if ($rule->{source}) {
1724         eval {
1725             my $source_ipversion = parse_address_list($rule->{source});
1726             &$set_ip_version($source_ipversion);
1727         };
1728         &$add_error('source', $@) if $@;
1729         &$check_ipset_or_alias_property('source', $ipversion);
1730     }
1731
1732     if ($rule->{dest}) {
1733         eval {
1734             my $dest_ipversion = parse_address_list($rule->{dest});
1735             &$set_ip_version($dest_ipversion);
1736         };
1737         &$add_error('dest', $@) if $@;
1738         &$check_ipset_or_alias_property('dest', $ipversion);
1739     }
1740
1741     $rule->{ipversion} = $ipversion if $ipversion;
1742
1743     if ($rule->{macro} && !$error_count) {
1744         eval { &$apply_macro($rule->{macro}, $rule, 1, $ipversion); };
1745         if (my $err = $@) {
1746             if (ref($err) eq "PVE::Exception" && $err->{errors}) {
1747                 my $eh = $err->{errors};
1748                 foreach my $p (keys %$eh) {
1749                     &$add_error($p, $eh->{$p});
1750                 }
1751             } else {
1752                 &$add_error('macro', "$err");
1753             }
1754         }
1755     }
1756
1757     $rule->{errors} = $errors if $error_count;
1758
1759     return $rule;
1760 }
1761
1762 sub copy_rule_data {
1763     my ($rule, $param) = @_;
1764
1765     foreach my $k (keys %$rule_properties) {
1766         if (defined(my $v = $param->{$k})) {
1767             if ($v eq '' || $v eq '-') {
1768                 delete $rule->{$k};
1769             } else {
1770                 $rule->{$k} = $v;
1771             }
1772         }
1773     }
1774
1775     return $rule;
1776 }
1777
1778 sub rules_modify_permissions {
1779     my ($rule_env) = @_;
1780
1781     if ($rule_env eq 'host') {
1782         return {
1783             check => ['perm', '/nodes/{node}', [ 'Sys.Modify' ]],
1784         };
1785     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1786         return {
1787             check => ['perm', '/', [ 'Sys.Modify' ]],
1788         };
1789     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1790         return {
1791             check => ['perm', '/vms/{vmid}', [ 'VM.Config.Network' ]],
1792         }
1793     }
1794
1795     return undef;
1796 }
1797
1798 sub rules_audit_permissions {
1799     my ($rule_env) = @_;
1800
1801     if ($rule_env eq 'host') {
1802         return {
1803             check => ['perm', '/nodes/{node}', [ 'Sys.Audit' ]],
1804         };
1805     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1806         return {
1807             check => ['perm', '/', [ 'Sys.Audit' ]],
1808         };
1809     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1810         return {
1811             check => ['perm', '/vms/{vmid}', [ 'VM.Audit' ]],
1812         }
1813     }
1814
1815     return undef;
1816 }
1817
1818 # core functions
1819 my $bridge_firewall_enabled = 0;
1820
1821 sub enable_bridge_firewall {
1822
1823     return if $bridge_firewall_enabled; # only once
1824
1825     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
1826     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
1827
1828     # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
1829     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
1830
1831     $bridge_firewall_enabled = 1;
1832 }
1833
1834 sub iptables_restore_cmdlist {
1835     my ($cmdlist, $table) = @_;
1836
1837     $table = 'filter' if !$table;
1838     run_command(['iptables-restore', '-T', $table, '-n'], input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1839 }
1840
1841 sub ip6tables_restore_cmdlist {
1842     my ($cmdlist, $table) = @_;
1843
1844     $table = 'filter' if !$table;
1845     run_command(['ip6tables-restore', '-T', $table, '-n'], input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1846 }
1847
1848 sub ipset_restore_cmdlist {
1849     my ($cmdlist) = @_;
1850
1851     run_command(['ipset', 'restore'], input => $cmdlist, errmsg => "ipset_restore_cmdlist");
1852 }
1853
1854 sub ebtables_restore_cmdlist {
1855     my ($cmdlist) = @_;
1856
1857     run_command(['ebtables-restore'], input => $cmdlist, errmsg => "ebtables_restore_cmdlist");
1858 }
1859
1860 sub iptables_get_chains {
1861     my ($iptablescmd, $t) = @_;
1862
1863     $iptablescmd = "iptables" if !$iptablescmd;
1864     $t = 'filter' if !$t;
1865
1866     my $res = {};
1867
1868     # check what chains we want to track
1869     my $is_pvefw_chain = sub {
1870         my $name = shift;
1871
1872         return 1 if $name =~ m/^PVEFW-\S+$/;
1873
1874         return 1 if $name =~ m/^tap\d+i\d+-(?:IN|OUT)$/;
1875
1876         return 1 if $name =~ m/^veth\d+i\d+-(?:IN|OUT)$/;
1877
1878         return 1 if $name =~ m/^fwbr\d+(v\d+)?-(?:FW|IN|OUT|IPS)$/;
1879         return 1 if $name =~ m/^GROUP-(?:$security_group_name_pattern)-(?:IN|OUT)$/;
1880
1881         return undef;
1882     };
1883
1884     my $table = '';
1885
1886     my $hooks = {};
1887
1888     my $parser = sub {
1889         my $line = shift;
1890
1891         return if $line =~ m/^#/;
1892         return if $line =~ m/^\s*$/;
1893
1894         if ($line =~ m/^\*(\S+)$/) {
1895             $table = $1;
1896             return;
1897         }
1898
1899         return if $table ne $t;
1900
1901         if ($line =~ m/^:(\S+)\s/) {
1902             my $chain = $1;
1903             return if !&$is_pvefw_chain($chain);
1904             $res->{$chain} = "unknown";
1905         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
1906             my ($chain, $sig) = ($1, $2);
1907             return if !&$is_pvefw_chain($chain);
1908             $res->{$chain} = $sig;
1909         } elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD|PREROUTING)\s+-j\s+PVEFW-\1$/) {
1910             $hooks->{$1} = 1;
1911         } else {
1912             # simply ignore the rest
1913             return;
1914         }
1915     };
1916
1917     run_command(["$iptablescmd-save"], outfunc => $parser);
1918
1919     return wantarray ? ($res, $hooks) : $res;
1920 }
1921
1922 sub iptables_chain_digest {
1923     my ($rules) = @_;
1924     my $digest = Digest::SHA->new('sha1');
1925     foreach my $rule (@$rules) { # order is important
1926         $digest->add($rule);
1927     }
1928     return $digest->b64digest;
1929 }
1930
1931 sub ipset_chain_digest {
1932     my ($rules) = @_;
1933
1934     my $digest = Digest::SHA->new('sha1');
1935     foreach my $rule (sort @$rules) { # note: sorted
1936         $digest->add($rule);
1937     }
1938     return $digest->b64digest;
1939 }
1940
1941 sub ipset_get_chains {
1942
1943     my $res = {};
1944     my $chains = {};
1945
1946     my $parser = sub {
1947         my $line = shift;
1948
1949         return if $line =~ m/^#/;
1950         return if $line =~ m/^\s*$/;
1951         if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
1952             my $chain = $1;
1953             $line =~ s/\s+$//; # delete trailing white space
1954             push @{$chains->{$chain}}, $line;
1955         } else {
1956             # simply ignore the rest
1957             return;
1958         }
1959     };
1960
1961     run_command(['ipset', 'save'], outfunc => $parser);
1962
1963     # compute digest for each chain
1964     foreach my $chain (keys %$chains) {
1965         $res->{$chain} = ipset_chain_digest($chains->{$chain});
1966     }
1967
1968     return $res;
1969 }
1970
1971 sub ebtables_get_chains {
1972
1973     my $res = {};
1974     my $chains = {};
1975     my $parser = sub {
1976         my $line = shift;
1977         return if $line =~ m/^#/;
1978         return if $line =~ m/^\s*$/;
1979         if ($line =~ m/^:(\S+)\s(ACCEPT|DROP|RETURN)$/) {
1980             # Make sure we know chains exist even if they're empty.
1981             $chains->{$1} //= [];
1982             $res->{$1}->{policy} = $2;
1983         } elsif ($line =~ m/^(?:\S+)\s(\S+)\s(?:\S+).*/) {
1984             my $chain = $1;
1985             $line =~ s/\s+$//;
1986             push @{$chains->{$chain}}, $line;
1987         } else {
1988             # simply ignore the rest
1989             return;
1990         }
1991     };
1992
1993     run_command(['ebtables-save'], outfunc => $parser);
1994     # compute digest for each chain and store rules as well
1995     foreach my $chain (keys %$chains) {
1996         $res->{$chain}->{rules} = $chains->{$chain};
1997         $res->{$chain}->{sig} = iptables_chain_digest($chains->{$chain});
1998     }
1999     return $res;
2000 }
2001
2002 # substitute action of rule according to action hash
2003 sub rule_substitude_action {
2004     my ($rule, $actions) = @_;
2005
2006     if (my $action = $rule->{action}) {
2007         $rule->{action} = $actions->{$action} if defined($actions->{$action});
2008     }
2009 }
2010
2011 # generate a src or dst match
2012 # $dir(ection) is either d or s
2013 sub ipt_gen_src_or_dst_match {
2014     my ($adr, $dir, $ipversion, $cluster_conf, $fw_conf) = @_;
2015
2016     my $srcdst;
2017     if ($dir eq 's') {
2018         $srcdst = "src";
2019     } elsif ($dir eq 'd') {
2020         $srcdst = "dst";
2021     } else {
2022         die "ipt_gen_src_or_dst_match: invalid direction $dir \n";
2023     }
2024
2025     my $match;
2026     if ($adr =~ m/^\+/) {
2027         if ($adr =~ m/^\+(${ipset_name_pattern})$/) {
2028             my $name = $1;
2029             my $ipset_chain;
2030             if ($fw_conf && $fw_conf->{ipset}->{$name}) {
2031                 $ipset_chain = compute_ipset_chain_name($fw_conf->{vmid}, $name, $ipversion);
2032             } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
2033                 $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
2034             } else {
2035                 die "no such ipset '$name'\n";
2036             }
2037             $match = "-m set --match-set ${ipset_chain} ${srcdst}";
2038         } else {
2039             die "invalid security group name '$adr'\n";
2040         }
2041     } elsif ($adr =~ m/^${ip_alias_pattern}$/){
2042         my $alias = lc($adr);
2043         my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2044         $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
2045         die "no such alias '$adr'\n" if !$e;
2046         $match = "-${dir} $e->{cidr}";
2047     } elsif ($adr =~ m/\-/){
2048         $match = "-m iprange --${srcdst}-range $adr";
2049     } else {
2050         $match = "-${dir} $adr";
2051     }
2052
2053     return $match;
2054 }
2055
2056 # convert a %rule to an array of iptables commands
2057 sub ipt_rule_to_cmds {
2058     my ($rule, $chain, $ipversion, $cluster_conf, $fw_conf, $vmid) = @_;
2059
2060     die "ipt_rule_to_cmds unable to handle macro" if $rule->{macro}; #should not happen
2061
2062     my @match = ();
2063
2064     if (defined $rule->{match}) {
2065         push @match, $rule->{match};
2066     } else {
2067         push @match, "-i $rule->{iface_in}" if $rule->{iface_in};
2068         push @match, "-o $rule->{iface_out}" if $rule->{iface_out};
2069
2070         if ($rule->{source}) {
2071             push @match, ipt_gen_src_or_dst_match($rule->{source}, 's', $ipversion, $cluster_conf, $fw_conf);
2072         }
2073         if ($rule->{dest}) {
2074             push @match, ipt_gen_src_or_dst_match($rule->{dest}, 'd', $ipversion, $cluster_conf, $fw_conf);
2075         }
2076
2077         if (my $proto = $rule->{proto}) {
2078             push @match, "-p $proto";
2079
2080             my $multidport = defined($rule->{dport}) && parse_port_name_number_or_range($rule->{dport}, 1);
2081             my $multisport = defined($rule->{sport}) && parse_port_name_number_or_range($rule->{sport}, 0);
2082
2083             my $add_dport = sub {
2084                 return if !defined($rule->{dport});
2085
2086                 # NOTE: we re-use dport to store --icmp-type for icmp* protocol
2087                 if ($proto eq 'icmp') {
2088                     $is_valid_icmp_type->($rule->{dport}, $icmp_type_names);
2089                     push @match, "-m icmp --icmp-type $rule->{dport}";
2090                 } elsif ($proto eq 'icmpv6') {
2091                     $is_valid_icmp_type->($rule->{dport}, $icmpv6_type_names);
2092                     push @match, "-m icmpv6 --icmpv6-type $rule->{dport}";
2093                 } elsif (!$PROTOCOLS_WITH_PORTS->{$proto}) {
2094                     die "protocol $proto does not have ports\n";
2095                 } elsif ($multidport) {
2096                     push @match, "--match multiport", "--dports $rule->{dport}";
2097                 } else {
2098                     return if !$rule->{dport};
2099                     push @match, "--dport $rule->{dport}";
2100                 }
2101             };
2102
2103             my $add_sport = sub {
2104                 return if !$rule->{sport};
2105
2106                 die "protocol $proto does not have ports\n"
2107                     if !$PROTOCOLS_WITH_PORTS->{$proto};
2108                 if ($multisport) {
2109                     push @match, "--match multiport", "--sports $rule->{sport}";
2110                 } else {
2111                     push @match, "--sport $rule->{sport}";
2112                 }
2113             };
2114
2115             my $add_icmp_type = sub {
2116                 return if !defined($rule->{'icmp-type'}) || $rule->{'icmp-type'} eq '';
2117
2118                 die "'icmp-type' can only be set if 'icmp', 'icmpv6' or 'ipv6-icmp' is specified\n"
2119                     if ($proto ne 'icmp') && ($proto ne 'icmpv6') && ($proto ne 'ipv6-icmp');
2120                 my $type = $proto eq 'icmp' ? 'icmp-type' : 'icmpv6-type';
2121
2122                 push @match, "-m $proto --$type $rule->{'icmp-type'}";
2123             };
2124
2125             # order matters - single port before multiport!
2126             $add_icmp_type->();
2127             $add_dport->() if $multisport;
2128             $add_sport->();
2129             $add_dport->() if !$multisport;
2130         } elsif ($rule->{dport} || $rule->{sport}) {
2131             die "destination port '$rule->{dport}', but no protocol specified\n" if $rule->{dport};
2132             die "source port '$rule->{sport}', but no protocol specified\n" if $rule->{sport};
2133         }
2134
2135         push @match, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
2136     }
2137     my $matchstr = scalar(@match) ? join(' ', @match) : "";
2138
2139     my $targetstr;
2140     if (defined $rule->{target}) {
2141         $targetstr = $rule->{target};
2142     } else {
2143         my $action = (defined $rule->{action}) ? $rule->{action} : "";
2144         my $goto = 1 if $action eq 'PVEFW-SET-ACCEPT-MARK';
2145         $targetstr = ($goto) ? "-g $action" : "-j $action";
2146     }
2147
2148     my @iptcmds;
2149     my $log = $rule->{log};
2150     if (defined($log) && $log ne 'nolog') {
2151         my $loglevel = $log_level_hash->{$log};
2152         my $logaction = get_log_rule_base($chain, $vmid, $rule->{logmsg}, $loglevel);
2153         push @iptcmds, "-A $chain $matchstr $logaction";
2154     }
2155     push @iptcmds, "-A $chain $matchstr $targetstr";
2156     return @iptcmds;
2157 }
2158
2159 sub ruleset_generate_rule {
2160     my ($ruleset, $chain, $ipversion, $rule, $cluster_conf, $fw_conf, $vmid) = @_;
2161
2162     my $rules;
2163
2164     if ($rule->{macro}) {
2165         $rules = &$apply_macro($rule->{macro}, $rule, 0, $ipversion);
2166     } else {
2167         $rules = [ $rule ];
2168     }
2169
2170     # update all or nothing
2171     my @ipt_rule_cmds;
2172     foreach my $r (@$rules) {
2173         push @ipt_rule_cmds, ipt_rule_to_cmds($r, $chain, $ipversion, $cluster_conf, $fw_conf, $vmid);
2174     }
2175     foreach my $c (@ipt_rule_cmds) {
2176         ruleset_add_ipt_cmd($ruleset, $chain, $c);
2177     }
2178 }
2179
2180 sub ruleset_create_chain {
2181     my ($ruleset, $chain) = @_;
2182
2183     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
2184     die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
2185
2186     die "chain '$chain' already exists\n" if $ruleset->{$chain};
2187
2188     $ruleset->{$chain} = [];
2189 }
2190
2191 sub ruleset_chain_exist {
2192     my ($ruleset, $chain) = @_;
2193
2194     return $ruleset->{$chain} ? 1 : undef;
2195 }
2196
2197 # add an iptables command (like generated by ipt_rule_to_cmds) to a chain
2198 sub ruleset_add_ipt_cmd {
2199    my ($ruleset, $chain, $iptcmd) = @_;
2200
2201    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2202
2203    push @{$ruleset->{$chain}}, $iptcmd;
2204 }
2205
2206 sub ruleset_addrule {
2207     my ($ruleset, $chain, $match, $action, $log, $logmsg, $vmid) = @_;
2208
2209     die "no such chain '$chain'\n" if !$ruleset->{$chain};
2210
2211     if ($log) {
2212         my $loglevel = $log_level_hash->{$log};
2213         my $logaction = get_log_rule_base($chain, $vmid, $logmsg, $loglevel);
2214         push @{$ruleset->{$chain}}, "-A $chain $match $logaction";
2215     }
2216     # for stable ebtables digests avoid double-spaces to match ebtables-save output
2217     $match .= ' ' if length($match);
2218     push @{$ruleset->{$chain}}, "-A $chain ${match}$action";
2219 }
2220
2221 sub ruleset_insertrule {
2222    my ($ruleset, $chain, $match, $action, $log) = @_;
2223
2224    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2225
2226    unshift @{$ruleset->{$chain}}, "-A $chain $match $action";
2227 }
2228
2229 sub get_log_rule_base {
2230     my ($chain, $vmid, $msg, $loglevel) = @_;
2231
2232     $vmid = 0 if !defined($vmid);
2233     $msg = "" if !defined($msg);
2234
2235     my $rlimit = '';
2236     if (defined($global_log_ratelimit)) {
2237         $rlimit = "-m limit $global_log_ratelimit ";
2238     }
2239
2240     # Note: we use special format for prefix to pass further
2241     # info to log daemon (VMID, LOGLEVEL and CHAIN)
2242     return "${rlimit}-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
2243 }
2244
2245 sub ruleset_add_chain_policy {
2246     my ($ruleset, $chain, $ipversion, $vmid, $policy, $loglevel, $accept_action) = @_;
2247
2248     if ($policy eq 'ACCEPT') {
2249
2250         my $rule = { action => 'ACCEPT' };
2251         rule_substitude_action($rule, { ACCEPT =>  $accept_action});
2252         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule);
2253
2254     } elsif ($policy eq 'DROP') {
2255
2256         ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Drop");
2257
2258         ruleset_addrule($ruleset, $chain, "", "-j DROP", $loglevel, "policy $policy: ", $vmid);
2259     } elsif ($policy eq 'REJECT') {
2260         ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Reject");
2261
2262         ruleset_addrule($ruleset, $chain, "", "-g PVEFW-reject", $loglevel, "policy $policy: ", $vmid);
2263     } else {
2264         # should not happen
2265         die "internal error: unknown policy '$policy'";
2266     }
2267 }
2268
2269 sub ruleset_chain_add_ndp {
2270     my ($ruleset, $chain, $ipversion, $options, $direction, $accept) = @_;
2271     return if $ipversion != 6 || (defined($options->{ndp}) && !$options->{ndp});
2272
2273     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-solicitation", $accept);
2274     if ($direction ne 'OUT' || $options->{radv}) {
2275         ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", $accept);
2276     }
2277     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-solicitation", $accept);
2278     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-advertisement", $accept);
2279 }
2280
2281 sub ruleset_chain_add_conn_filters {
2282     my ($ruleset, $chain, $allow_invalid, $accept) = @_;
2283
2284     if (!$allow_invalid) {
2285         ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID", "-j DROP");
2286     }
2287     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED", "-j $accept");
2288 }
2289
2290 sub ruleset_chain_add_input_filters {
2291     my ($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel) = @_;
2292
2293     if ($cluster_conf->{ipset}->{blacklist}){
2294         if (!ruleset_chain_exist($ruleset, "PVEFW-blacklist")) {
2295             ruleset_create_chain($ruleset, "PVEFW-blacklist");
2296             ruleset_addrule($ruleset, "PVEFW-blacklist", "", "-j DROP", $loglevel, "DROP: ", 0);
2297         }
2298         my $ipset_chain = compute_ipset_chain_name(0, 'blacklist', $ipversion);
2299         ruleset_addrule($ruleset, $chain, "-m set --match-set ${ipset_chain} src", "-j PVEFW-blacklist");
2300     }
2301
2302     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
2303         if ($ipversion == 4) {
2304             ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW", "-j PVEFW-smurfs");
2305         }
2306     }
2307
2308     if ($options->{tcpflags}) {
2309         ruleset_addrule($ruleset, $chain, "-p tcp", "-j PVEFW-tcpflags");
2310     }
2311 }
2312
2313 sub ruleset_create_vm_chain {
2314     my ($ruleset, $chain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction) = @_;
2315
2316     ruleset_create_chain($ruleset, $chain);
2317     my $accept = generate_nfqueue($options);
2318
2319     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
2320         if ($ipversion == 4) {
2321             if ($direction eq 'OUT') {
2322                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2323                                       { action => 'PVEFW-SET-ACCEPT-MARK',
2324                                         proto => 'udp', sport => 68, dport => 67 });
2325             } else {
2326                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2327                                       { action => 'ACCEPT',
2328                                         proto => 'udp', sport => 67, dport => 68 });
2329             }
2330         } elsif ($ipversion == 6) {
2331             if ($direction eq 'OUT') {
2332                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2333                                       { action => 'PVEFW-SET-ACCEPT-MARK',
2334                                         proto => 'udp', sport => 546, dport => 547 });
2335             } else {
2336                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2337                                       { action => 'ACCEPT',
2338                                         proto => 'udp', sport => 547, dport => 546 });
2339             }
2340         }
2341
2342     }
2343
2344     if ($direction eq 'OUT') {
2345         if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
2346             ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr", "-j DROP");
2347         }
2348         if ($ipversion == 6 && !$options->{radv}) {
2349             ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", "-j DROP");
2350         }
2351         if ($ipfilter_ipset) {
2352             ruleset_addrule($ruleset, $chain, "-m set ! --match-set $ipfilter_ipset src", "-j DROP");
2353         }
2354         ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2355     }
2356
2357     my $accept_action = $direction eq 'OUT' ? '-g PVEFW-SET-ACCEPT-MARK' : "-j $accept";
2358     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, $direction, $accept_action);
2359 }
2360
2361 sub ruleset_add_group_rule {
2362     my ($ruleset, $cluster_conf, $chain, $rule, $direction, $action, $ipversion) = @_;
2363
2364     my $group = $rule->{action};
2365     my $group_chain = "GROUP-$group-$direction";
2366     if(!ruleset_chain_exist($ruleset, $group_chain)){
2367         generate_group_rules($ruleset, $cluster_conf, $group, $ipversion);
2368     }
2369
2370     if ($direction eq 'OUT' && $rule->{iface_out}) {
2371         ruleset_addrule($ruleset, $chain, "-o $rule->{iface_out}", "-j $group_chain");
2372     } elsif ($direction eq 'IN' && $rule->{iface_in}) {
2373         ruleset_addrule($ruleset, $chain, "-i $rule->{iface_in}", "-j $group_chain");
2374     } else {
2375         ruleset_addrule($ruleset, $chain, "", "-j $group_chain");
2376     }
2377
2378     ruleset_addrule($ruleset, $chain, "-m mark --mark $FWACCEPTMARK_ON", "-j $action");
2379 }
2380
2381 sub ruleset_generate_vm_rules {
2382     my ($ruleset, $rules, $cluster_conf, $vmfw_conf, $chain, $netid, $direction, $options, $ipversion, $vmid) = @_;
2383
2384     my $lc_direction = lc($direction);
2385
2386     my $in_accept = generate_nfqueue($options);
2387
2388     foreach my $rule (@$rules) {
2389         next if $rule->{iface} && $rule->{iface} ne $netid;
2390         next if !$rule->{enable} || $rule->{errors};
2391         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2392
2393         if ($rule->{type} eq 'group') {
2394             ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, $direction,
2395                                    $direction eq 'OUT' ? 'RETURN' : $in_accept, $ipversion);
2396         } else {
2397             next if $rule->{type} ne $lc_direction;
2398             eval {
2399                 $rule->{logmsg} = "$rule->{action}: ";
2400                 if ($direction eq 'OUT') {
2401                     rule_substitude_action($rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
2402                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $vmfw_conf, $vmid);
2403                 } else {
2404                     rule_substitude_action($rule, { ACCEPT => $in_accept , REJECT => "PVEFW-reject" });
2405                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $vmfw_conf, $vmid);
2406                 }
2407             };
2408             warn $@ if $@;
2409         }
2410     }
2411 }
2412
2413 sub generate_nfqueue {
2414     my ($options) = @_;
2415
2416     if ($options->{ips}) {
2417         my $action = "NFQUEUE";
2418         if ($options->{ips_queues} && $options->{ips_queues} =~ m/^(\d+)(:(\d+))?$/) {
2419             if (defined($3) && defined($1)) {
2420                 $action .= " --queue-balance $1:$3";
2421             } elsif (defined($1)) {
2422                 $action .= " --queue-num $1";
2423             }
2424         }
2425         $action .= " --queue-bypass" if $feature_ipset_nomatch; #need kernel 3.10
2426         return $action;
2427     } else {
2428         return "ACCEPT";
2429     }
2430 }
2431
2432 sub ruleset_generate_vm_ipsrules {
2433     my ($ruleset, $options, $direction, $iface) = @_;
2434
2435     if ($options->{ips} && $direction eq 'IN') {
2436         my $nfqueue = generate_nfqueue($options);
2437
2438         if (!ruleset_chain_exist($ruleset, "PVEFW-IPS")) {
2439             ruleset_create_chain($ruleset, "PVEFW-IPS");
2440         }
2441
2442         ruleset_addrule($ruleset, "PVEFW-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged", "-j $nfqueue");
2443     }
2444 }
2445
2446 sub generate_tap_rules_direction {
2447     my ($ruleset, $cluster_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $direction, $ipversion) = @_;
2448
2449     my $lc_direction = lc($direction);
2450
2451     my $rules = $vmfw_conf->{rules};
2452
2453     my $options = $vmfw_conf->{options};
2454     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
2455
2456     my $tapchain = "$iface-$direction";
2457
2458     my $ipfilter_name = compute_ipfilter_ipset_name($netid);
2459     my $ipfilter_ipset = compute_ipset_chain_name($vmid, $ipfilter_name, $ipversion)
2460         if $options->{ipfilter} || $vmfw_conf->{ipset}->{$ipfilter_name};
2461
2462     if ($options->{enable}) {
2463         # create chain with mac and ip filter
2464         ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
2465
2466         ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $tapchain, $netid, $direction, $options, $ipversion, $vmid);
2467
2468         ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface);
2469
2470         # implement policy
2471         my $policy;
2472
2473         if ($direction eq 'OUT') {
2474             $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
2475         } else {
2476             $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
2477         }
2478
2479         my $accept = generate_nfqueue($options);
2480         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
2481         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, $policy, $loglevel, $accept_action);
2482     } else {
2483         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : 'ACCEPT';
2484         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, 'ACCEPT', $loglevel, $accept_action);
2485     }
2486
2487     # plug the tap chain to bridge chain
2488     if ($direction eq 'IN') {
2489         ruleset_addrule($ruleset, "PVEFW-FWBR-IN",
2490                         "-m physdev --physdev-is-bridged --physdev-out $iface", "-j $tapchain");
2491     } else {
2492         ruleset_addrule($ruleset, "PVEFW-FWBR-OUT",
2493                         "-m physdev --physdev-is-bridged --physdev-in $iface", "-j $tapchain");
2494     }
2495 }
2496
2497 sub enable_host_firewall {
2498     my ($ruleset, $hostfw_conf, $cluster_conf, $ipversion, $corosync_conf) = @_;
2499
2500     my $options = $hostfw_conf->{options};
2501     my $cluster_options = $cluster_conf->{options};
2502     my $rules = $hostfw_conf->{rules};
2503     my $cluster_rules = $cluster_conf->{rules};
2504
2505     # corosync preparation
2506     my $corosync_rule = "-p udp --dport 5404:5405";
2507     my $corosync_local_addresses = {};
2508     my $multicast_enabled;
2509     my $local_hostname = PVE::INotify::nodename();
2510     if (defined($corosync_conf)) {
2511         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2512             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2513
2514             if ($node_name eq $local_hostname) {
2515                 $corosync_local_addresses->{$key} = $node_ip;
2516             }
2517         });
2518
2519         # allow multicast only if enabled in config
2520         my $corosync_transport = $corosync_conf->{main}->{totem}->{transport};
2521         $multicast_enabled = defined($corosync_transport) && $corosync_transport eq 'udp';
2522     }
2523
2524     # host inbound firewall
2525     my $chain = "PVEFW-HOST-IN";
2526     ruleset_create_chain($ruleset, $chain);
2527
2528     my $loglevel = get_option_log_level($options, "log_level_in");
2529
2530     ruleset_addrule($ruleset, $chain, "-i lo", "-j ACCEPT");
2531
2532     ruleset_chain_add_conn_filters($ruleset, $chain, 0, 'ACCEPT');
2533     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'IN', '-j RETURN');
2534     ruleset_chain_add_input_filters($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel);
2535
2536     # we use RETURN because we need to check also tap rules
2537     my $accept_action = 'RETURN';
2538
2539     ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
2540
2541     # add host rules first, so that cluster wide rules can be overwritten
2542     foreach my $rule (@$rules, @$cluster_rules) {
2543         next if !$rule->{enable} || $rule->{errors};
2544         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2545
2546         $rule->{iface_in} = $rule->{iface} if $rule->{iface};
2547
2548         eval {
2549             $rule->{logmsg} = "$rule->{action}: ";
2550             if ($rule->{type} eq 'group') {
2551                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'IN', $accept_action, $ipversion);
2552             } elsif ($rule->{type} eq 'in') {
2553                 rule_substitude_action($rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
2554                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $hostfw_conf, 0);
2555             }
2556         };
2557         warn $@ if $@;
2558         delete $rule->{iface_in};
2559     }
2560
2561     # allow standard traffic for management ipset (includes cluster network)
2562     my $mngmnt_ipset_chain = compute_ipset_chain_name(0, "management", $ipversion);
2563     my $mngmntsrc = "-m set --match-set ${mngmnt_ipset_chain} src";
2564     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 8006", "-j $accept_action");  # PVE API
2565     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
2566     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
2567     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 22", "-j $accept_action");  # SSH
2568     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 60000:60050", "-j $accept_action");  # Migration
2569
2570     # corosync inbound rules
2571     if (defined($corosync_conf)) {
2572         ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action")
2573             if $multicast_enabled;
2574
2575         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2576             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2577             my $destination = $corosync_local_addresses->{$key};
2578
2579             if ($node_name ne $local_hostname && defined($destination)) {
2580                 # accept only traffic on same ring
2581                 ruleset_addrule($ruleset, $chain, "-d $destination -s $node_ip $corosync_rule", "-j $accept_action");
2582             }
2583         });
2584     }
2585
2586     # implement input policy
2587     my $policy = $cluster_options->{policy_in} || 'DROP'; # allow nothing by default
2588     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2589
2590     # host outbound firewall
2591     $chain = "PVEFW-HOST-OUT";
2592     ruleset_create_chain($ruleset, $chain);
2593
2594     $loglevel = get_option_log_level($options, "log_level_out");
2595
2596     ruleset_addrule($ruleset, $chain, "-o lo", "-j ACCEPT");
2597
2598     ruleset_chain_add_conn_filters($ruleset, $chain, 0, 'ACCEPT');
2599
2600     # we use RETURN because we may want to check other thigs later
2601     $accept_action = 'RETURN';
2602     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'OUT', "-j $accept_action");
2603
2604     ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
2605
2606     # add host rules first, so that cluster wide rules can be overwritten
2607     foreach my $rule (@$rules, @$cluster_rules) {
2608         next if !$rule->{enable} || $rule->{errors};
2609         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2610
2611         $rule->{iface_out} = $rule->{iface} if $rule->{iface};
2612         eval {
2613             $rule->{logmsg} = "$rule->{action}: ";
2614             if ($rule->{type} eq 'group') {
2615                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'OUT', $accept_action, $ipversion);
2616             } elsif ($rule->{type} eq 'out') {
2617                 rule_substitude_action($rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
2618                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $hostfw_conf, 0);
2619             }
2620         };
2621         warn $@ if $@;
2622         delete $rule->{iface_out};
2623     }
2624
2625     # allow standard traffic on cluster network
2626     my $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
2627     my $localnet_ver = $cluster_conf->{aliases}->{local_network}->{ipversion};
2628
2629     if ($localnet && ($ipversion == $localnet_ver)) {
2630         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 8006", "-j $accept_action");  # PVE API
2631         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 22", "-j $accept_action");  # SSH
2632         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
2633         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
2634     }
2635
2636     # corosync outbound rules
2637     if (defined($corosync_conf)) {
2638         ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action")
2639             if $multicast_enabled;
2640
2641         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2642             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2643             my $source = $corosync_local_addresses->{$key};
2644
2645             if ($node_name ne $local_hostname && defined($source)) {
2646                 # accept only traffic on same ring
2647                 ruleset_addrule($ruleset, $chain, "-s $source -d $node_ip $corosync_rule", "-j $accept_action");
2648             }
2649         });
2650     }
2651
2652     # implement output policy
2653     $policy = $cluster_options->{policy_out} || 'ACCEPT'; # allow everything by default
2654     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2655
2656     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "", "-j PVEFW-HOST-OUT");
2657     ruleset_addrule($ruleset, "PVEFW-INPUT", "", "-j PVEFW-HOST-IN");
2658 }
2659
2660 sub generate_group_rules {
2661     my ($ruleset, $cluster_conf, $group, $ipversion) = @_;
2662
2663     my $rules = $cluster_conf->{groups}->{$group};
2664
2665     if (!$rules) {
2666         warn "no such security group '$group'\n";
2667         $rules = []; # create empty chain
2668     }
2669
2670     my $chain = "GROUP-${group}-IN";
2671
2672     ruleset_create_chain($ruleset, $chain);
2673     ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2674
2675     foreach my $rule (@$rules) {
2676         next if $rule->{type} ne 'in';
2677         next if !$rule->{enable} || $rule->{errors};
2678         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2679         rule_substitude_action($rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
2680         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf);
2681     }
2682
2683     $chain = "GROUP-${group}-OUT";
2684
2685     ruleset_create_chain($ruleset, $chain);
2686     ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2687
2688     foreach my $rule (@$rules) {
2689         next if $rule->{type} ne 'out';
2690         next if !$rule->{enable} || $rule->{errors};
2691         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2692         # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
2693         # check also other tap rules later
2694         rule_substitude_action($rule, { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" });
2695         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf);
2696     }
2697 }
2698
2699 my $MAX_NETS = 32;
2700 my $valid_netdev_names = {};
2701 for (my $i = 0; $i < $MAX_NETS; $i++)  {
2702     $valid_netdev_names->{"net$i"} = 1;
2703 }
2704
2705 sub get_mark_values {
2706     my ($value, $mask) = @_;
2707     $value = hex($value) if $value =~ /^0x/;
2708     $mask = hex($mask) if defined($mask) && $mask =~ /^0x/;
2709     $mask = 0xffffffff if !defined($mask);
2710     return ($value, $mask);
2711 }
2712
2713 sub parse_fw_rule {
2714     my ($prefix, $line, $cluster_conf, $fw_conf, $rule_env) = @_;
2715
2716     my $orig_line = $line;
2717
2718     my $rule = {};
2719
2720     # we can add single line comments to the end of the rule
2721     if ($line =~ s/#\s*(.*?)\s*$//) {
2722         $rule->{comment} = decode('utf8', $1);
2723     }
2724
2725     # we can disable a rule when prefixed with '|'
2726
2727     $rule->{enable} = $line =~ s/^\|// ? 0 : 1;
2728
2729     $line =~ s/^(\S+)\s+(\S+)\s*// ||
2730         die "unable to parse rule: $line\n";
2731
2732     $rule->{type} = lc($1);
2733     $rule->{action} = $2;
2734
2735     if ($rule->{type} eq  'in' || $rule->{type} eq 'out') {
2736         if ($rule->{action} =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
2737             $rule->{macro} = $1;
2738             $rule->{action} = $2;
2739         }
2740     }
2741
2742     while (length($line)) {
2743         if ($line =~ s/^-i (\S+)\s*//) {
2744             $rule->{iface} = $1;
2745             next;
2746         }
2747
2748         last if $rule->{type} eq 'group';
2749
2750         if ($line =~ s/^(?:-p|--?proto) (\S+)\s*//) {
2751             $rule->{proto} = $1;
2752             next;
2753         }
2754
2755         if ($line =~ s/^--?dport (\S+)\s*//) {
2756             $rule->{dport} = $1;
2757             next;
2758         }
2759
2760         if ($line =~ s/^--?sport (\S+)\s*//) {
2761             $rule->{sport} = $1;
2762             next;
2763         }
2764         if ($line =~ s/^--?source (\S+)\s*//) {
2765             $rule->{source} = $1;
2766             next;
2767         }
2768         if ($line =~ s/^--?dest (\S+)\s*//) {
2769             $rule->{dest} = $1;
2770             next;
2771         }
2772         if ($line =~ s/^--?log (emerg|alert|crit|err|warning|notice|info|debug|nolog)\s*//) {
2773             $rule->{log} = $1;
2774             next;
2775         }
2776         if ($line =~ s/^--?icmp-type (\S+)\s*//) {
2777             $rule->{'icmp-type'} = $1;
2778             next;
2779         }
2780
2781         last;
2782     }
2783
2784     die "unable to parse rule parameters: $line\n" if length($line);
2785
2786     $rule = verify_rule($rule, $cluster_conf, $fw_conf, $rule_env, 1);
2787     if ($rule->{errors}) {
2788         # The verbose flag really means we're running from the CLI and want
2789         # output on the console - in the other case we really want such errors
2790         # to go into the syslog instead.
2791         my $log = $verbose ? sub { warn @_ } : sub { syslog(err => @_) };
2792         $log->("$prefix - errors in rule parameters: $orig_line\n");
2793         foreach my $p (keys %{$rule->{errors}}) {
2794             $log->("  $p: $rule->{errors}->{$p}\n");
2795         }
2796     }
2797
2798     return $rule;
2799 }
2800
2801 sub verify_ethertype {
2802     my ($value) = @_;
2803     my $types = get_etc_ethertypes();
2804     die "unknown ethernet protocol type: $value\n"
2805         if !defined($types->{byname}->{$value}) &&
2806            !defined($types->{byid}->{$value});
2807 }
2808
2809 sub parse_vmfw_option {
2810     my ($line) = @_;
2811
2812     my ($opt, $value);
2813
2814     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2815
2816     if ($line =~ m/^(enable|dhcp|ndp|radv|macfilter|ipfilter|ips):\s*(0|1)\s*$/i) {
2817         $opt = lc($1);
2818         $value = int($2);
2819     } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
2820         $opt = lc($1);
2821         $value = $2 ? lc($3) : '';
2822     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2823         $opt = lc($1);
2824         $value = uc($3);
2825     } elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
2826         $opt = lc($1);
2827         $value = $2;
2828     } elsif ($line =~ m/^(layer2_protocols):\s*(((\S+)[,]?)+)\s*$/i) {
2829         $opt = lc($1);
2830         $value = $2;
2831         verify_ethertype($_) foreach split(/\s*,\s*/, $value);
2832     } else {
2833         die "can't parse option '$line'\n"
2834     }
2835
2836     return ($opt, $value);
2837 }
2838
2839 sub parse_hostfw_option {
2840     my ($line) = @_;
2841
2842     my ($opt, $value);
2843
2844     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2845
2846     if ($line =~ m/^(enable|nosmurfs|tcpflags|ndp|log_nf_conntrack|nf_conntrack_allow_invalid|protection_synflood):\s*(0|1)\s*$/i) {
2847         $opt = lc($1);
2848         $value = int($2);
2849     } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
2850         $opt = lc($1);
2851         $value = $2 ? lc($3) : '';
2852     } elsif ($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) {
2853         $opt = lc($1);
2854         $value = int($2);
2855     } else {
2856         die "can't parse option '$line'\n"
2857     }
2858
2859     return ($opt, $value);
2860 }
2861
2862 sub parse_clusterfw_option {
2863     my ($line) = @_;
2864
2865     my ($opt, $value);
2866
2867     if ($line =~ m/^(enable):\s*(\d+)\s*$/i) {
2868         $opt = lc($1);
2869         $value = int($2);
2870         if (($value > 1) && ((time() - $value) > 60)) {
2871             $value = 0
2872         }
2873     } elsif ($line =~ m/^(ebtables):\s*(0|1)\s*$/i) {
2874         $opt = lc($1);
2875         $value = int($2);
2876     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2877         $opt = lc($1);
2878         $value = uc($3);
2879     } elsif ($line =~ m/^(log_ratelimit):\s*(\S+)\s*$/) {
2880         $opt = lc($1);
2881         $value = $2;
2882     } else {
2883         die "can't parse option '$line'\n"
2884     }
2885
2886     return ($opt, $value);
2887 }
2888
2889 sub resolve_alias {
2890     my ($clusterfw_conf, $fw_conf, $cidr) = @_;
2891
2892     my $alias = lc($cidr);
2893     my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2894     $e = $clusterfw_conf->{aliases}->{$alias} if !$e && $clusterfw_conf;
2895
2896     die "no such alias '$cidr'\n" if !$e;;
2897
2898     return wantarray ? ($e->{cidr}, $e->{ipversion}) : $e->{cidr};
2899 }
2900
2901 sub parse_ip_or_cidr {
2902     my ($cidr) = @_;
2903
2904     my $ipversion;
2905
2906     if ($cidr =~ m!^(?:$IPV6RE)(/(\d+))?$!) {
2907         $cidr =~ s|/128$||;
2908         $ipversion = 6;
2909     } elsif ($cidr =~ m!^(?:$IPV4RE)(/(\d+))?$!) {
2910         $cidr =~ s|/32$||;
2911         $ipversion = 4;
2912     } else {
2913         die "value does not look like a valid IP address or CIDR network\n";
2914     }
2915
2916     return wantarray ? ($cidr, $ipversion) : $cidr;
2917 }
2918
2919 sub parse_alias {
2920     my ($line) = @_;
2921
2922     # we can add single line comments to the end of the line
2923     my $comment = decode('utf8', $1) if $line =~ s/\s*#\s*(.*?)\s*$//;
2924
2925     if ($line =~ m/^(\S+)\s(\S+)$/) {
2926         my ($name, $cidr) = ($1, $2);
2927         my $ipversion;
2928
2929         ($cidr, $ipversion) = parse_ip_or_cidr($cidr);
2930
2931         my $data = {
2932             name => $name,
2933             cidr => $cidr,
2934             ipversion => $ipversion,
2935         };
2936         $data->{comment} = $comment  if $comment;
2937         return $data;
2938     }
2939
2940     return undef;
2941 }
2942
2943 sub generic_fw_config_parser {
2944     my ($filename, $cluster_conf, $empty_conf, $rule_env) = @_;
2945
2946     my $section;
2947     my $group;
2948
2949     my $res = $empty_conf;
2950
2951     my $raw;
2952     if ($filename =~ m!^/etc/pve/(.*)$!) {
2953         $raw = PVE::Cluster::get_config($1);
2954     } else {
2955         $raw = eval { PVE::Tools::file_get_contents($filename) }; # ignore errors
2956     }
2957     return {} if !$raw;
2958
2959     my $curr_group_keys = {};
2960
2961     my $linenr = 0;
2962     while ($raw =~ /^\h*(.*?)\h*$/gm) {
2963         my $line = $1;
2964         $linenr++;
2965         next if $line =~ m/^#/;
2966         next if $line =~ m/^\s*$/;
2967         chomp $line;
2968
2969         my $prefix = "$filename (line $linenr)";
2970
2971         if ($empty_conf->{options} && ($line =~ m/^\[options\]$/i)) {
2972             $section = 'options';
2973             next;
2974         }
2975
2976         if ($empty_conf->{aliases} && ($line =~ m/^\[aliases\]$/i)) {
2977             $section = 'aliases';
2978             next;
2979         }
2980
2981         if ($empty_conf->{groups} && ($line =~ m/^\[group\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2982             $section = 'groups';
2983             $group = lc($1);
2984             my $comment = $2;
2985             eval {
2986                 die "security group name too long\n" if length($group) > $max_group_name_length;
2987                 die "invalid security group name '$group'\n" if $group !~ m/^${security_group_name_pattern}$/;
2988             };
2989             if (my $err = $@) {
2990                 ($section, $group, $comment) = undef;
2991                 warn "$prefix: $err";
2992                 next;
2993             }
2994
2995             $res->{$section}->{$group} = [];
2996             $res->{group_comments}->{$group} =  decode('utf8', $comment)
2997                 if $comment;
2998             next;
2999         }
3000
3001         if ($empty_conf->{rules} && ($line =~ m/^\[rules\]$/i)) {
3002             $section = 'rules';
3003             next;
3004         }
3005
3006         if ($empty_conf->{ipset} && ($line =~ m/^\[ipset\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
3007             $section = 'ipset';
3008             $group = lc($1);
3009             my $comment = $2;
3010             eval {
3011                 die "ipset name too long\n" if length($group) > $max_ipset_name_length;
3012                 die "invalid ipset name '$group'\n" if $group !~ m/^${ipset_name_pattern}$/;
3013             };
3014             if (my $err = $@) {
3015                 ($section, $group, $comment) = undef;
3016                 warn "$prefix: $err";
3017                 next;
3018             }
3019
3020             $res->{$section}->{$group} = [];
3021             $curr_group_keys = {};
3022
3023             $res->{ipset_comments}->{$group} = decode('utf8', $comment)
3024                 if $comment;
3025             next;
3026         }
3027
3028         if (!$section) {
3029             warn "$prefix: skip line - no section\n";
3030             next;
3031         }
3032
3033         if ($section eq 'options') {
3034             eval {
3035                 my ($opt, $value);
3036                 if ($rule_env eq 'cluster') {
3037                     ($opt, $value) = parse_clusterfw_option($line);
3038                 } elsif ($rule_env eq 'host') {
3039                     ($opt, $value) = parse_hostfw_option($line);
3040                 } else {
3041                     ($opt, $value) = parse_vmfw_option($line);
3042                 }
3043                 $res->{options}->{$opt} = $value;
3044             };
3045             warn "$prefix: $@" if $@;
3046         } elsif ($section eq 'aliases') {
3047             eval {
3048                 my $data = parse_alias($line);
3049                 $res->{aliases}->{lc($data->{name})} = $data;
3050             };
3051             warn "$prefix: $@" if $@;
3052         } elsif ($section eq 'rules') {
3053             my $rule;
3054             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, $res, $rule_env); };
3055             if (my $err = $@) {
3056                 warn "$prefix: $err";
3057                 next;
3058             }
3059             push @{$res->{$section}}, $rule;
3060         } elsif ($section eq 'groups') {
3061             my $rule;
3062             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, undef, 'group'); };
3063             if (my $err = $@) {
3064                 warn "$prefix: $err";
3065                 next;
3066             }
3067             push @{$res->{$section}->{$group}}, $rule;
3068         } elsif ($section eq 'ipset') {
3069             # we can add single line comments to the end of the rule
3070             my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
3071
3072             $line =~ m/^(\!)?\s*(\S+)\s*$/;
3073             my $nomatch = $1;
3074             my $cidr = $2;
3075             my $errors;
3076
3077             if ($nomatch && !$feature_ipset_nomatch) {
3078                 $errors->{nomatch} = "nomatch not supported by kernel";
3079             }
3080
3081             eval {
3082                 if ($cidr =~ m/^${ip_alias_pattern}$/) {
3083                     resolve_alias($cluster_conf, $res, $cidr); # make sure alias exists
3084                 } else {
3085                     $cidr = parse_ip_or_cidr($cidr);
3086                 }
3087                 die "duplicate ipset entry for '$cidr'\n"
3088                     if defined($curr_group_keys->{$cidr});
3089             };
3090             if (my $err = $@) {
3091                 chomp $err;
3092                 $errors->{cidr} = $err;
3093             }
3094
3095             if ($cidr =~ m!/0+$!) {
3096                 $errors->{cidr} = "a zero prefix is not allowed in ipset entries\n";
3097             }
3098
3099             my $entry = { cidr => $cidr };
3100             $entry->{nomatch} = 1 if $nomatch;
3101             $entry->{comment} = $comment if $comment;
3102             $entry->{errors} =  $errors if $errors;
3103
3104             if ($verbose && $errors) {
3105                 warn "$prefix - errors in ipset '$group': $line\n";
3106                 foreach my $p (keys %{$errors}) {
3107                     warn "  $p: $errors->{$p}\n";
3108                 }
3109             }
3110
3111             push @{$res->{$section}->{$group}}, $entry;
3112             $curr_group_keys->{$cidr} = 1;
3113         } else {
3114             warn "$prefix: skip line - unknown section\n";
3115             next;
3116         }
3117     }
3118
3119     return $res;
3120 }
3121
3122 # this is only used to prevent concurrent runs of rule compilation/application
3123 # see lock_*_conf for cfs locks protectiong config modification
3124 sub run_locked {
3125     my ($code, @param) = @_;
3126
3127     my $timeout = 10;
3128
3129     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
3130
3131     die $@ if $@;
3132
3133     return $res;
3134 }
3135
3136 sub read_local_vm_config {
3137
3138     my $qemu = {};
3139     my $lxc = {};
3140
3141     my $vmdata = { qemu => $qemu, lxc => $lxc };
3142
3143     my $vmlist = PVE::Cluster::get_vmlist();
3144     return $vmdata if !$vmlist || !$vmlist->{ids};
3145     my $ids = $vmlist->{ids};
3146
3147     foreach my $vmid (keys %$ids) {
3148         next if !$vmid; # skip VE0
3149         my $d = $ids->{$vmid};
3150         next if !$d->{node} || $d->{node} ne $nodename;
3151         next if !$d->{type};
3152         if ($d->{type} eq 'qemu') {
3153             if ($have_qemu_server) {
3154                 my $cfspath = PVE::QemuConfig->cfs_config_path($vmid);
3155                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
3156                     $qemu->{$vmid} = $conf;
3157                 }
3158             }
3159         } elsif ($d->{type} eq 'lxc') {
3160             if ($have_lxc) {
3161                 my $cfspath = PVE::LXC::Config->cfs_config_path($vmid);
3162                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
3163                     $lxc->{$vmid} = $conf;
3164                 }
3165             }
3166         }
3167     }
3168
3169     return $vmdata;
3170 };
3171
3172 sub lock_vmfw_conf {
3173     my ($vmid, $timeout, $code, @param) = @_;
3174
3175     die "can't lock VM firewall config for undefined VMID\n"
3176         if !defined($vmid);
3177
3178     my $res = PVE::Cluster::cfs_lock_firewall("vm-$vmid", $timeout, $code, @param);
3179     die $@ if $@;
3180
3181     return $res;
3182 }
3183
3184 sub load_vmfw_conf {
3185     my ($cluster_conf, $rule_env, $vmid, $dir) = @_;
3186
3187     $dir = $pvefw_conf_dir if !defined($dir);
3188     my $filename = "$dir/$vmid.fw";
3189
3190     my $empty_conf = {
3191         rules => [],
3192         options => {},
3193         aliases => {},
3194         ipset => {} ,
3195         ipset_comments => {},
3196     };
3197
3198     my $vmfw_conf = generic_fw_config_parser($filename, $cluster_conf, $empty_conf, $rule_env);
3199     $vmfw_conf->{vmid} = $vmid;
3200
3201     return $vmfw_conf;
3202 }
3203
3204 my $format_rules = sub {
3205     my ($rules, $allow_iface) = @_;
3206
3207     my $raw = '';
3208
3209     foreach my $rule (@$rules) {
3210         if ($rule->{type} eq  'in' || $rule->{type} eq 'out' || $rule->{type} eq 'group') {
3211             $raw .= '|' if defined($rule->{enable}) && !$rule->{enable};
3212             $raw .= uc($rule->{type});
3213             if ($rule->{macro}) {
3214                 $raw .= " $rule->{macro}($rule->{action})";
3215             } else {
3216                 $raw .= " " . $rule->{action};
3217             }
3218             if ($allow_iface && $rule->{iface}) {
3219                 $raw .= " -i $rule->{iface}";
3220             }
3221
3222             if ($rule->{type} ne  'group')  {
3223                 $raw .= " -source $rule->{source}" if $rule->{source};
3224                 $raw .= " -dest $rule->{dest}" if $rule->{dest};
3225                 $raw .= " -p $rule->{proto}" if $rule->{proto};
3226                 $raw .= " -dport $rule->{dport}" if $rule->{dport};
3227                 $raw .= " -sport $rule->{sport}" if $rule->{sport};
3228                 $raw .= " -log $rule->{log}" if $rule->{log};
3229                 $raw .= " -icmp-type $rule->{'icmp-type'}" if defined($rule->{'icmp-type'}) && $rule->{'icmp-type'} ne '';
3230             }
3231
3232             $raw .= " # " . encode('utf8', $rule->{comment})
3233                 if $rule->{comment} && $rule->{comment} !~ m/^\s*$/;
3234             $raw .= "\n";
3235         } else {
3236             die "unknown rule type '$rule->{type}'";
3237         }
3238     }
3239
3240     return $raw;
3241 };
3242
3243 my $format_options = sub {
3244     my ($options) = @_;
3245
3246     my $raw = '';
3247
3248     $raw .= "[OPTIONS]\n\n";
3249     foreach my $opt (keys %$options) {
3250         $raw .= "$opt: $options->{$opt}\n";
3251     }
3252     $raw .= "\n";
3253
3254     return $raw;
3255 };
3256
3257 my $format_aliases = sub {
3258     my ($aliases) = @_;
3259
3260     my $raw = '';
3261
3262     $raw .= "[ALIASES]\n\n";
3263     foreach my $k (keys %$aliases) {
3264         my $e = $aliases->{$k};
3265         $raw .= "$e->{name} $e->{cidr}";
3266         $raw .= " # " . encode('utf8', $e->{comment})
3267             if $e->{comment} && $e->{comment} !~ m/^\s*$/;
3268         $raw .= "\n";
3269     }
3270     $raw .= "\n";
3271
3272     return $raw;
3273 };
3274
3275 my $format_ipsets = sub {
3276     my ($fw_conf) = @_;
3277
3278     my $raw = '';
3279
3280     foreach my $ipset (sort keys %{$fw_conf->{ipset}}) {
3281         if (my $comment = $fw_conf->{ipset_comments}->{$ipset}) {
3282             my $utf8comment = encode('utf8', $comment);
3283             $raw .= "[IPSET $ipset] # $utf8comment\n\n";
3284         } else {
3285             $raw .= "[IPSET $ipset]\n\n";
3286         }
3287         my $options = $fw_conf->{ipset}->{$ipset};
3288
3289         my $nethash = {};
3290         foreach my $entry (@$options) {
3291             my $cidr = $entry->{cidr};
3292             if (defined($nethash->{$cidr})) {
3293                 warn "ignoring duplicate ipset entry '$cidr'\n";
3294                 next;
3295             }
3296
3297             $nethash->{$cidr} = $entry;
3298         }
3299
3300         foreach my $cidr (sort keys %$nethash) {
3301             my $entry = $nethash->{$cidr};
3302             my $line = $entry->{nomatch} ? '!' : '';
3303             $line .= $entry->{cidr};
3304             $line .= " # " . encode('utf8', $entry->{comment})
3305                 if $entry->{comment} && $entry->{comment} !~ m/^\s*$/;
3306             $raw .= "$line\n";
3307         }
3308
3309         $raw .= "\n";
3310     }
3311
3312     return $raw;
3313 };
3314
3315 sub save_vmfw_conf {
3316     my ($vmid, $vmfw_conf) = @_;
3317
3318     my $raw = '';
3319
3320     my $options = $vmfw_conf->{options};
3321     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3322
3323     my $aliases = $vmfw_conf->{aliases};
3324     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3325
3326     $raw .= &$format_ipsets($vmfw_conf) if $vmfw_conf->{ipset};
3327
3328     my $rules = $vmfw_conf->{rules} || [];
3329     if ($rules && scalar(@$rules)) {
3330         $raw .= "[RULES]\n\n";
3331         $raw .= &$format_rules($rules, 1);
3332         $raw .= "\n";
3333     }
3334
3335     my $filename = "$pvefw_conf_dir/$vmid.fw";
3336     if ($raw) {
3337         mkdir $pvefw_conf_dir;
3338         PVE::Tools::file_set_contents($filename, $raw);
3339     } else {
3340         unlink $filename;
3341     }
3342 }
3343
3344 sub remove_vmfw_conf {
3345     my ($vmid) = @_;
3346
3347     my $vmfw_conffile = "$pvefw_conf_dir/$vmid.fw";
3348
3349     unlink $vmfw_conffile;
3350 }
3351
3352 sub clone_vmfw_conf {
3353     my ($vmid, $newid) = @_;
3354
3355     my $sourcevm_conffile = "$pvefw_conf_dir/$vmid.fw";
3356     my $clonevm_conffile = "$pvefw_conf_dir/$newid.fw";
3357
3358     lock_vmfw_conf($newid, 10, sub {
3359         if (-f $clonevm_conffile) {
3360             unlink $clonevm_conffile;
3361         }
3362         if (-f $sourcevm_conffile) {
3363             my $data = PVE::Tools::file_get_contents($sourcevm_conffile);
3364             PVE::Tools::file_set_contents($clonevm_conffile, $data);
3365         }
3366     });
3367 }
3368
3369 sub read_vm_firewall_configs {
3370     my ($cluster_conf, $vmdata, $dir) = @_;
3371
3372     my $vmfw_configs = {};
3373
3374     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3375         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'vm', $vmid, $dir);
3376         next if !$vmfw_conf->{options}; # skip if file does not exist
3377         $vmfw_configs->{$vmid} = $vmfw_conf;
3378     }
3379     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3380         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'ct', $vmid, $dir);
3381         next if !$vmfw_conf->{options}; # skip if file does not exist
3382         $vmfw_configs->{$vmid} = $vmfw_conf;
3383     }
3384
3385     return $vmfw_configs;
3386 }
3387
3388 sub get_option_log_level {
3389     my ($options, $k) = @_;
3390
3391     my $v = $options->{$k};
3392     $v = $default_log_level if !defined($v);
3393
3394     return undef if $v eq '' || $v eq 'nolog';
3395
3396     return $v if defined($log_level_hash->{$v});
3397
3398     warn "unknown log level ($k = '$v')\n";
3399
3400     return undef;
3401 }
3402
3403 sub generate_std_chains {
3404     my ($ruleset, $options, $ipversion) = @_;
3405
3406     my $std_chains = $pve_std_chains->{$ipversion} || die "internal error";
3407
3408     my $loglevel = get_option_log_level($options, 'smurf_log_level');
3409     my $chain = 'PVEFW-smurflog';
3410     if ( $std_chains->{$chain} ) {
3411         foreach my $r (@{$std_chains->{$chain}}) {
3412           $r->{log} = $loglevel;
3413         }
3414     }
3415
3416     # same as shorewall logflags action.
3417     $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
3418     $chain = 'PVEFW-logflags';
3419     if ( $std_chains->{$chain} ) {
3420         foreach my $r (@{$std_chains->{$chain}}) {
3421           $r->{log} = $loglevel;
3422         }
3423     }
3424
3425     foreach my $chain (keys %$std_chains) {
3426         ruleset_create_chain($ruleset, $chain);
3427         foreach my $rule (@{$std_chains->{$chain}}) {
3428             if (ref($rule)) {
3429                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, 0);
3430             } else {
3431                 die "rule $rule as string - should not happen";
3432             }
3433         }
3434     }
3435 }
3436
3437 sub generate_ipset_chains {
3438     my ($ipset_ruleset, $clusterfw_conf, $fw_conf, $device_ips, $ipsets) = @_;
3439
3440     foreach my $ipset (keys %{$ipsets}) {
3441
3442         my $options = $ipsets->{$ipset};
3443
3444         if ($device_ips && $ipset =~ /^ipfilter-(net\d+)$/) {
3445             if (my $ips = $device_ips->{$1}) {
3446                 $options = [@$options, @$ips];
3447             }
3448         }
3449
3450         # remove duplicates
3451         my $nethash = {};
3452         foreach my $entry (@$options) {
3453             next if $entry->{errors}; # skip entries with errors
3454             eval {
3455                 my ($cidr, $ver);
3456                 if ($entry->{cidr} =~ m/^${ip_alias_pattern}$/) {
3457                     ($cidr, $ver) = resolve_alias($clusterfw_conf, $fw_conf, $entry->{cidr});
3458                 } else {
3459                     ($cidr, $ver) = parse_ip_or_cidr($entry->{cidr});
3460                 }
3461                 #http://backreference.org/2013/03/01/ipv6-address-normalization/
3462                 if ($ver == 6) {
3463                     # ip_compress_address takes an address only, no CIDR
3464                     my ($addr, $prefix_len) = ($cidr =~ m@^([^/]*)(/.*)?$@);
3465                     $cidr = lc(Net::IP::ip_compress_address($addr, 6));
3466                     $cidr .= $prefix_len if defined($prefix_len);
3467                     $cidr =~ s|/128$||;
3468                 } else {
3469                     $cidr =~ s|/32$||;
3470                 }
3471
3472                 $nethash->{$ver}->{$cidr} = { cidr => $cidr, nomatch => $entry->{nomatch} };
3473             };
3474             warn $@ if $@;
3475         }
3476
3477         foreach my $ipversion (4, 6) {
3478             my $data = $nethash->{$ipversion};
3479
3480             my $name = compute_ipset_chain_name($fw_conf->{vmid}, $ipset, $ipversion);
3481
3482             my $hashsize = scalar(@$options);
3483             if ($hashsize <= 64) {
3484                 $hashsize = 64;
3485             } else {
3486                 $hashsize = round_powerof2($hashsize);
3487             }
3488
3489             my $family = $ipversion == "6" ? "inet6" : "inet";
3490
3491             $ipset_ruleset->{$name} = ["create $name hash:net family $family hashsize $hashsize maxelem $hashsize"];
3492
3493             foreach my $cidr (sort keys %$data) {
3494                 my $entry = $data->{$cidr};
3495
3496                 my $cmd = "add $name $cidr";
3497                 if ($entry->{nomatch}) {
3498                     if ($feature_ipset_nomatch) {
3499                         push @{$ipset_ruleset->{$name}}, "$cmd nomatch";
3500                     } else {
3501                         warn "ignore !$cidr - nomatch not supported by kernel\n";
3502                     }
3503                 } else {
3504                     push @{$ipset_ruleset->{$name}}, $cmd;
3505                 }
3506             }
3507         }
3508     }
3509 }
3510
3511 sub round_powerof2 {
3512     my ($int) = @_;
3513
3514     $int--;
3515     $int |= $int >> $_ foreach (1,2,4,8,16);
3516     return ++$int;
3517 }
3518
3519 my $set_global_log_ratelimit = sub {
3520     my $cluster_opts = shift;
3521
3522     $global_log_ratelimit = '--limit 1/sec';
3523     if (defined(my $log_rlimit = $cluster_opts->{log_ratelimit})) {
3524         my $ll_format = $cluster_option_properties->{log_ratelimit}->{format};
3525         my $limit = PVE::JSONSchema::parse_property_string($ll_format, $log_rlimit);
3526
3527         if ($limit->{enable}) {
3528             if (my $rate = $limit->{rate}) {
3529                 $global_log_ratelimit = "--limit $rate";
3530             }
3531             if (my $burst = $limit->{burst}) {
3532                 $global_log_ratelimit .= " --limit-burst $burst";
3533             }
3534         } else {
3535             $global_log_ratelimit = undef;
3536         }
3537     }
3538 };
3539
3540 sub lock_clusterfw_conf {
3541     my ($timeout, $code, @param) = @_;
3542
3543     my $res = PVE::Cluster::cfs_lock_firewall("cluster", $timeout, $code, @param);
3544     die $@ if $@;
3545
3546     return $res;
3547 }
3548
3549 sub load_clusterfw_conf {
3550     my ($filename) = @_;
3551
3552     $filename = $clusterfw_conf_filename if !defined($filename);
3553     my $empty_conf = {
3554         rules => [],
3555         options => {},
3556         aliases => {},
3557         groups => {},
3558         group_comments => {},
3559         ipset => {} ,
3560         ipset_comments => {},
3561     };
3562
3563     my $cluster_conf = generic_fw_config_parser($filename, $empty_conf, $empty_conf, 'cluster');
3564     $set_global_log_ratelimit->($cluster_conf->{options});
3565
3566     return $cluster_conf;
3567 }
3568
3569 sub save_clusterfw_conf {
3570     my ($cluster_conf) = @_;
3571
3572     my $raw = '';
3573
3574     my $options = $cluster_conf->{options};
3575     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3576
3577     my $aliases = $cluster_conf->{aliases};
3578     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3579
3580     $raw .= &$format_ipsets($cluster_conf) if $cluster_conf->{ipset};
3581
3582     my $rules = $cluster_conf->{rules};
3583     if ($rules && scalar(@$rules)) {
3584         $raw .= "[RULES]\n\n";
3585         $raw .= &$format_rules($rules, 1);
3586         $raw .= "\n";
3587     }
3588
3589     if ($cluster_conf->{groups}) {
3590         foreach my $group (sort keys %{$cluster_conf->{groups}}) {
3591             my $rules = $cluster_conf->{groups}->{$group};
3592             if (my $comment = $cluster_conf->{group_comments}->{$group}) {
3593                 my $utf8comment = encode('utf8', $comment);
3594                 $raw .= "[group $group] # $utf8comment\n\n";
3595             } else {
3596                 $raw .= "[group $group]\n\n";
3597             }
3598
3599             $raw .= &$format_rules($rules, 0);
3600             $raw .= "\n";
3601         }
3602     }
3603
3604     if ($raw) {
3605         mkdir $pvefw_conf_dir;
3606         PVE::Tools::file_set_contents($clusterfw_conf_filename, $raw);
3607     } else {
3608         unlink $clusterfw_conf_filename;
3609     }
3610 }
3611
3612 sub lock_hostfw_conf {
3613     my ($timeout, $code, @param) = @_;
3614
3615     my $res = PVE::Cluster::cfs_lock_firewall("host-$nodename", $timeout, $code, @param);
3616     die $@ if $@;
3617
3618     return $res;
3619 }
3620
3621 sub load_hostfw_conf {
3622     my ($cluster_conf, $filename) = @_;
3623
3624     $filename = $hostfw_conf_filename if !defined($filename);
3625
3626     my $empty_conf = { rules => [], options => {}};
3627     return generic_fw_config_parser($filename, $cluster_conf, $empty_conf, 'host');
3628 }
3629
3630 sub save_hostfw_conf {
3631     my ($hostfw_conf) = @_;
3632
3633     my $raw = '';
3634
3635     my $options = $hostfw_conf->{options};
3636     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3637
3638     my $rules = $hostfw_conf->{rules};
3639     if ($rules && scalar(@$rules)) {
3640         $raw .= "[RULES]\n\n";
3641         $raw .= &$format_rules($rules, 1);
3642         $raw .= "\n";
3643     }
3644
3645     if ($raw) {
3646         PVE::Tools::file_set_contents($hostfw_conf_filename, $raw);
3647     } else {
3648         unlink $hostfw_conf_filename;
3649     }
3650 }
3651
3652 sub compile {
3653     my ($cluster_conf, $hostfw_conf, $vmdata, $corosync_conf) = @_;
3654
3655     my $vmfw_configs;
3656
3657     # fixme: once we read standard chains from config this needs to be put in test/standard cases below
3658     $pve_std_chains = dclone($pve_std_chains_conf);
3659
3660     if ($vmdata) { # test mode
3661         my $testdir = $vmdata->{testdir} || die "no test directory specified";
3662         my $filename = "$testdir/cluster.fw";
3663         $cluster_conf = load_clusterfw_conf($filename);
3664
3665         $filename = "$testdir/host.fw";
3666         $hostfw_conf = load_hostfw_conf($cluster_conf, $filename);
3667
3668         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, $testdir);
3669     } else { # normal operation
3670         $cluster_conf = load_clusterfw_conf(undef) if !$cluster_conf;
3671
3672         $hostfw_conf = load_hostfw_conf($cluster_conf, undef) if !$hostfw_conf;
3673
3674         # cfs_update is handled by daemon or API
3675         $corosync_conf = PVE::Cluster::cfs_read_file("corosync.conf")
3676             if !defined($corosync_conf) && PVE::Corosync::check_conf_exists(1);
3677
3678         $vmdata = read_local_vm_config();
3679         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, undef);
3680     }
3681
3682     return ({},{},{},{}) if !$cluster_conf->{options}->{enable};
3683
3684     my $localnet;
3685     if ($cluster_conf->{aliases}->{local_network}) {
3686         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3687     } else {
3688         my $localnet_ver;
3689         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3690
3691         $cluster_conf->{aliases}->{local_network} = {
3692             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3693     }
3694
3695     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3696
3697     my $ruleset = {};
3698     my $rulesetv6 = {};
3699     $ruleset->{filter} = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 4);
3700     $ruleset->{raw} = compile_iptables_raw($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 4);
3701     $rulesetv6->{filter} = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 6);
3702     $rulesetv6->{raw} = compile_iptables_raw($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 6);
3703     my $ebtables_ruleset = compile_ebtables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata);
3704     my $ipset_ruleset = compile_ipsets($cluster_conf, $vmfw_configs, $vmdata);
3705
3706     return ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
3707 }
3708
3709 sub compile_iptables_raw {
3710     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, $ipversion) = @_;
3711
3712     my $ruleset = {};
3713
3714     my $hostfw_options = $hostfw_conf->{options} || {};
3715     my $protection_synflood = $hostfw_options->{protection_synflood} || 0;
3716
3717     if($protection_synflood) {
3718
3719         my $protection_synflood_rate = $hostfw_options->{protection_synflood_rate} ? $hostfw_options->{protection_synflood_rate} : 200;
3720         my $protection_synflood_burst = $hostfw_options->{protection_synflood_burst} ? $hostfw_options->{protection_synflood_burst} : 1000;
3721         my $protection_synflood_limit = $hostfw_options->{protection_synflood_limit} ? $hostfw_options->{protection_synflood_limit} : 3000;
3722         my $protection_synflood_expire = $hostfw_options->{nf_conntrack_tcp_timeout_syn_recv} ? $hostfw_options->{nf_conntrack_tcp_timeout_syn_recv} : 60;
3723         $protection_synflood_expire = $protection_synflood_expire * 1000;
3724         my $protection_synflood_mask = $ipversion == 4 ? 32 : 64;
3725
3726         ruleset_create_chain($ruleset, "PVEFW-PREROUTING");
3727         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");
3728     }
3729
3730     return $ruleset;
3731 }
3732
3733 sub compile_iptables_filter {
3734     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, $ipversion) = @_;
3735
3736     my $ruleset = {};
3737
3738     ruleset_create_chain($ruleset, "PVEFW-INPUT");
3739     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
3740
3741     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3742
3743     my $hostfw_options = $hostfw_conf->{options} || {};
3744
3745     # fixme: what log level should we use here?
3746     my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
3747
3748     my $conn_allow_invalid = $hostfw_options->{nf_conntrack_allow_invalid} // 0;
3749     ruleset_chain_add_conn_filters($ruleset, "PVEFW-FORWARD", $conn_allow_invalid, "ACCEPT");
3750
3751     ruleset_create_chain($ruleset, "PVEFW-FWBR-IN");
3752     ruleset_chain_add_input_filters($ruleset, "PVEFW-FWBR-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
3753
3754     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-in fwln+", "-j PVEFW-FWBR-IN");
3755
3756     ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3757     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-out fwln+", "-j PVEFW-FWBR-OUT");
3758
3759     generate_std_chains($ruleset, $hostfw_options, $ipversion);
3760
3761     my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
3762
3763     if ($hostfw_enable) {
3764         eval { enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf, $ipversion, $corosync_conf); };
3765         warn $@ if $@; # just to be sure - should not happen
3766     }
3767
3768     # generate firewall rules for QEMU VMs
3769     foreach my $vmid (sort keys %{$vmdata->{qemu}}) {
3770         eval {
3771             my $conf = $vmdata->{qemu}->{$vmid};
3772             my $vmfw_conf = $vmfw_configs->{$vmid};
3773             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3774
3775             foreach my $netid (sort keys %$conf) {
3776                 next if $netid !~ m/^net(\d+)$/;
3777                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3778                 next if !$net->{firewall};
3779
3780                 my $iface = "tap${vmid}i$1";
3781                 my $macaddr = $net->{macaddr};
3782                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3783                                              $vmfw_conf, $vmid, 'IN', $ipversion);
3784                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3785                                              $vmfw_conf, $vmid, 'OUT', $ipversion);
3786             }
3787         };
3788         warn $@ if $@; # just to be sure - should not happen
3789     }
3790
3791     # generate firewall rules for LXC containers
3792     foreach my $vmid (sort keys %{$vmdata->{lxc}}) {
3793         eval {
3794             my $conf = $vmdata->{lxc}->{$vmid};
3795             my $vmfw_conf = $vmfw_configs->{$vmid};
3796             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3797
3798             foreach my $netid (sort keys %$conf) {
3799                 next if $netid !~ m/^net(\d+)$/;
3800                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3801                 next if !$net->{firewall};
3802
3803                 my $iface = "veth${vmid}i$1";
3804                 my $macaddr = $net->{hwaddr};
3805                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3806                                              $vmfw_conf, $vmid, 'IN', $ipversion);
3807                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3808                                              $vmfw_conf, $vmid, 'OUT', $ipversion);
3809             }
3810         };
3811         warn $@ if $@; # just to be sure - should not happen
3812     }
3813
3814     if (ruleset_chain_exist($ruleset, "PVEFW-IPS")){
3815         ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED", "-j PVEFW-IPS");
3816     }
3817
3818     return $ruleset;
3819 }
3820
3821 sub mac_to_linklocal {
3822     my ($macaddr) = @_;
3823     my @parts = split(/:/, $macaddr);
3824     # The standard link local address uses the fe80::/64 prefix with the
3825     # modified EUI-64 identifier derived from the MAC address by flipping the
3826     # universal/local bit and inserting FF:FE in the middle.
3827     # See RFC 4291.
3828     $parts[0] = sprintf("%02x", hex($parts[0]) ^ 0x02);
3829     my @meui64 = (@parts[0,1,2], 'ff', 'fe', @parts[3,4,5]);
3830     return "fe80::$parts[0]$parts[1]:$parts[2]FF:FE$parts[3]:$parts[4]$parts[5]";
3831 }
3832
3833 sub compile_ipsets {
3834     my ($cluster_conf, $vmfw_configs, $vmdata) = @_;
3835
3836     my $localnet;
3837     if ($cluster_conf->{aliases}->{local_network}) {
3838         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3839     } else {
3840         my $localnet_ver;
3841         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3842
3843         $cluster_conf->{aliases}->{local_network} = {
3844             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3845     }
3846
3847     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3848
3849
3850     my $ipset_ruleset = {};
3851
3852     # generate ipsets for QEMU VMs
3853     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3854         eval {
3855             my $conf = $vmdata->{qemu}->{$vmid};
3856             my $vmfw_conf = $vmfw_configs->{$vmid};
3857             return if !$vmfw_conf;
3858
3859             # When the 'ipfilter' option is enabled every device for which there
3860             # is no 'ipfilter-netX' ipset defined gets an implicit empty default
3861             # ipset.
3862             # The reason is that ipfilter ipsets are always filled with standard
3863             # IPv6 link-local filters.
3864             my $ipsets = $vmfw_conf->{ipset};
3865             my $implicit_sets = {};
3866
3867             my $device_ips = {};
3868             foreach my $netid (keys %$conf) {
3869                 next if $netid !~ m/^net(\d+)$/;
3870                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3871                 next if !$net->{firewall};
3872
3873                 if ($vmfw_conf->{options}->{ipfilter} && !$ipsets->{"ipfilter-$netid"}) {
3874                     $implicit_sets->{"ipfilter-$netid"} = [];
3875                 }
3876
3877                 my $macaddr = $net->{macaddr};
3878                 my $linklocal = mac_to_linklocal($macaddr);
3879                 $device_ips->{$netid} = [
3880                     { cidr => $linklocal },
3881                     { cidr => 'fe80::/10', nomatch => 1 }
3882                 ];
3883             }
3884
3885             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $ipsets);
3886             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $implicit_sets);
3887         };
3888         warn $@ if $@; # just to be sure - should not happen
3889     }
3890
3891     # generate firewall rules for LXC containers
3892     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3893         eval {
3894             my $conf = $vmdata->{lxc}->{$vmid};
3895             my $vmfw_conf = $vmfw_configs->{$vmid};
3896             return if !$vmfw_conf;
3897
3898             # When the 'ipfilter' option is enabled every device for which there
3899             # is no 'ipfilter-netX' ipset defined gets an implicit empty default
3900             # ipset.
3901             # The reason is that ipfilter ipsets are always filled with standard
3902             # IPv6 link-local filters, as well as the IP addresses configured
3903             # for the container.
3904             my $ipsets = $vmfw_conf->{ipset};
3905             my $implicit_sets = {};
3906
3907             my $device_ips = {};
3908             foreach my $netid (keys %$conf) {
3909                 next if $netid !~ m/^net(\d+)$/;
3910                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3911                 next if !$net->{firewall};
3912
3913                 if ($vmfw_conf->{options}->{ipfilter} && !$ipsets->{"ipfilter-$netid"}) {
3914                     $implicit_sets->{"ipfilter-$netid"} = [];
3915                 }
3916
3917                 my $macaddr = $net->{hwaddr};
3918                 my $linklocal = mac_to_linklocal($macaddr);
3919                 my $set = $device_ips->{$netid} = [
3920                     { cidr => $linklocal },
3921                     { cidr => 'fe80::/10', nomatch => 1 }
3922                 ];
3923                 if (defined($net->{ip}) && $net->{ip} =~ m!^($IPV4RE)(?:/\d+)?$!) {
3924                     push @$set, { cidr => $1 };
3925                 }
3926                 if (defined($net->{ip6}) && $net->{ip6} =~ m!^($IPV6RE)(?:/\d+)?$!) {
3927                     push @$set, { cidr => $1 };
3928                 }
3929             }
3930
3931             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $ipsets);
3932             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $implicit_sets);
3933         };
3934         warn $@ if $@; # just to be sure - should not happen
3935     }
3936
3937     generate_ipset_chains($ipset_ruleset, undef, $cluster_conf, undef, $cluster_conf->{ipset});
3938
3939     return $ipset_ruleset;
3940 }
3941
3942 sub compile_ebtables_filter {
3943     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata) = @_;
3944
3945     if (!($cluster_conf->{options}->{ebtables} // 1)) {
3946         return {};
3947     }
3948
3949     my $ruleset = {};
3950
3951     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3952
3953     ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3954     #for ipv4 and ipv6, check macaddress in iptables, so we use conntrack 'ESTABLISHED', to speedup rules
3955     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-p IPv4', '-j ACCEPT');
3956     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-p IPv6', '-j ACCEPT');
3957     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-o fwln+', '-j PVEFW-FWBR-OUT');
3958
3959     # generate firewall rules for QEMU VMs
3960     foreach my $vmid (sort keys %{$vmdata->{qemu}}) {
3961         eval {
3962             my $conf = $vmdata->{qemu}->{$vmid};
3963             my $vmfw_conf = $vmfw_configs->{$vmid};
3964             return if !$vmfw_conf;
3965             my $ipsets = $vmfw_conf->{ipset};
3966
3967             foreach my $netid (sort keys %$conf) {
3968                 next if $netid !~ m/^net(\d+)$/;
3969                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3970                 next if !$net->{firewall};
3971                 my $iface = "tap${vmid}i$1";
3972                 my $macaddr = $net->{macaddr};
3973                 my $arpfilter = [];
3974                 if (defined(my $ipset = $ipsets->{"ipfilter-$netid"})) {
3975                     foreach my $ipaddr (@$ipset) {
3976                         my($ip, $version) = parse_ip_or_cidr($ipaddr->{cidr});
3977                         next if !$ip || ($version && $version != 4);
3978                         push(@$arpfilter, $ip);
3979                     }
3980                 }
3981                 generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter);
3982             }
3983         };
3984         warn $@ if $@; # just to be sure - should not happen
3985     }
3986
3987     # generate firewall rules for LXC containers
3988     foreach my $vmid (sort keys %{$vmdata->{lxc}}) {
3989         eval {
3990             my $conf = $vmdata->{lxc}->{$vmid};
3991
3992             my $vmfw_conf = $vmfw_configs->{$vmid};
3993             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3994             my $ipsets = $vmfw_conf->{ipset};
3995
3996             foreach my $netid (sort keys %$conf) {
3997                 next if $netid !~ m/^net(\d+)$/;
3998                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3999                 next if !$net->{firewall};
4000                 my $iface = "veth${vmid}i$1";
4001                 my $macaddr = $net->{hwaddr};
4002                 my $arpfilter = [];
4003                 if (defined(my $ipset = $ipsets->{"ipfilter-$netid"})) {
4004                     foreach my $ipaddr (@$ipset) {
4005                         my($ip, $version) = parse_ip_or_cidr($ipaddr->{cidr});
4006                         next if !$ip || ($version && $version != 4);
4007                         push(@$arpfilter, $ip);
4008                     }
4009                 }
4010                 if (defined(my $ip = $net->{ip}) && $vmfw_conf->{options}->{ipfilter}) {
4011                     # ebtables changes this to a .0/MASK network but we just
4012                     # want the address here, no network - see #2193
4013                     $ip =~ s|/(\d+)$||;
4014                     if ($ip ne 'dhcp') {
4015                         push @$arpfilter, $ip;
4016                     }
4017                 }
4018                 generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter);
4019             }
4020         };
4021         warn $@ if $@; # just to be sure - should not happen
4022     }
4023
4024     return $ruleset;
4025 }
4026
4027 sub generate_tap_layer2filter {
4028     my ($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter) = @_;
4029     my $options = $vmfw_conf->{options};
4030
4031     my $tapchain = $iface."-OUT";
4032
4033     # ebtables remove zeros from mac pairs
4034     $macaddr =~ s/0([0-9a-f])/$1/ig;
4035     $macaddr = lc($macaddr);
4036
4037     ruleset_create_chain($ruleset, $tapchain);
4038
4039     if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
4040             ruleset_addrule($ruleset, $tapchain, "-s ! $macaddr", '-j DROP');
4041     }
4042
4043     if (@$arpfilter){
4044         my $arpchain = $tapchain."-ARP";
4045         ruleset_addrule($ruleset, $tapchain, "-p ARP", "-j $arpchain");
4046         ruleset_create_chain($ruleset, $arpchain);
4047
4048         foreach my $ip (@{$arpfilter}) {
4049             ruleset_addrule($ruleset, $arpchain, "-p ARP --arp-ip-src $ip", '-j RETURN');
4050         }
4051         ruleset_addrule($ruleset, $arpchain, '', '-j DROP');
4052     }
4053
4054     if (defined($options->{layer2_protocols})){
4055         my $protochain = $tapchain."-PROTO";
4056         ruleset_addrule($ruleset, $tapchain, '', "-j $protochain");
4057         ruleset_create_chain($ruleset, $protochain);
4058
4059         foreach my $proto (split(/,/, $options->{layer2_protocols})) {
4060             ruleset_addrule($ruleset, $protochain, "-p $proto", '-j RETURN');
4061         }
4062         ruleset_addrule($ruleset, $protochain, '', '-j DROP');
4063     }
4064
4065     ruleset_addrule($ruleset, $tapchain, '', '-j ACCEPT');
4066
4067     ruleset_addrule($ruleset, 'PVEFW-FWBR-OUT', "-i $iface", "-j $tapchain");
4068 }
4069
4070 # the parameter $change_only_regex changes two things if defined:
4071 # * all chains not matching it will be left intact
4072 # * both the $active_chains hash and the returned status_hash have different
4073 #   structure (they contain a key named 'rules').
4074 sub get_ruleset_status {
4075     my ($ruleset, $active_chains, $digest_fn, $change_only_regex) = @_;
4076
4077     my $statushash = {};
4078
4079     foreach my $chain (sort keys %$ruleset) {
4080         my $rules = $ruleset->{$chain};
4081         my $sig = &$digest_fn($rules);
4082         my $oldsig;
4083
4084         $statushash->{$chain}->{sig} = $sig;
4085         if (defined($change_only_regex)) {
4086             $oldsig = $active_chains->{$chain}->{sig};
4087             $statushash->{$chain}->{rules} = $rules;
4088         } else {
4089             $oldsig = $active_chains->{$chain};
4090         }
4091         if (!defined($oldsig)) {
4092             $statushash->{$chain}->{action} = 'create';
4093         } else {
4094             if ($oldsig eq $sig) {
4095                 $statushash->{$chain}->{action} = 'exists';
4096             } else {
4097                 $statushash->{$chain}->{action} = 'update';
4098             }
4099         }
4100         if ($verbose) {
4101             print "$statushash->{$chain}->{action} $chain ($sig)\n";
4102             foreach my $cmd (@{$rules}) {
4103                 print "\t$cmd\n";
4104             }
4105         }
4106     }
4107
4108     foreach my $chain (sort keys %$active_chains) {
4109         next if defined($ruleset->{$chain});
4110         my $action = 'delete';
4111         my $sig = $active_chains->{$chain};
4112         if (defined($change_only_regex)) {
4113             $action = 'ignore' if ($chain !~ m/$change_only_regex/);
4114             $statushash->{$chain}->{rules} = $active_chains->{$chain}->{rules};
4115             $statushash->{$chain}->{policy} = $active_chains->{$chain}->{policy};
4116             $sig = $sig->{sig};
4117         }
4118         $statushash->{$chain}->{action} = $action;
4119         $statushash->{$chain}->{sig} = $sig;
4120         print "$action $chain ($sig)\n" if $verbose;
4121     }
4122
4123     return $statushash;
4124 }
4125
4126 sub print_sig_rule {
4127     my ($chain, $sig) = @_;
4128
4129     # We just use this to store a SHA1 checksum used to detect changes
4130     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
4131 }
4132
4133 sub get_ruleset_cmdlist {
4134     my ($ruleset, $iptablescmd, $table) = @_;
4135
4136     $table = 'filter' if !$table;
4137
4138     my $cmdlist = "*$table\n"; # we pass this to iptables-restore;
4139
4140     my ($active_chains, $hooks) = iptables_get_chains($iptablescmd, $table);
4141     my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest);
4142
4143     # create missing chains first
4144     foreach my $chain (sort keys %$ruleset) {
4145         my $stat = $statushash->{$chain};
4146         die "internal error" if !$stat;
4147         next if $stat->{action} ne 'create';
4148
4149         $cmdlist .= ":$chain - [0:0]\n";
4150     }
4151
4152     foreach my $h (qw(INPUT OUTPUT FORWARD PREROUTING)) {
4153         my $chain = "PVEFW-$h";
4154         if ($ruleset->{$chain} && !$hooks->{$h}) {
4155             $cmdlist .= "-A $h -j $chain\n";
4156         }
4157     }
4158
4159     foreach my $chain (sort keys %$ruleset) {
4160         my $stat = $statushash->{$chain};
4161         die "internal error" if !$stat;
4162
4163         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
4164             $cmdlist .= "-F $chain\n";
4165             foreach my $cmd (@{$ruleset->{$chain}}) {
4166                 $cmdlist .= "$cmd\n";
4167             }
4168             $cmdlist .= print_sig_rule($chain, $stat->{sig});
4169         } elsif ($stat->{action} eq 'delete') {
4170             die "internal error"; # this should not happen
4171         } elsif ($stat->{action} eq 'exists') {
4172             # do nothing
4173         } else {
4174             die "internal error - unknown status '$stat->{action}'";
4175         }
4176     }
4177
4178     foreach my $chain (keys %$statushash) {
4179         next if $statushash->{$chain}->{action} ne 'delete';
4180         $cmdlist .= "-F $chain\n";
4181     }
4182     foreach my $chain (keys %$statushash) {
4183         next if $statushash->{$chain}->{action} ne 'delete';
4184         next if $chain eq 'PVEFW-INPUT';
4185         next if $chain eq 'PVEFW-OUTPUT';
4186         next if $chain eq 'PVEFW-FORWARD';
4187         next if $chain eq 'PVEFW-PREROUTING';
4188         $cmdlist .= "-X $chain\n";
4189     }
4190
4191     my $changes = $cmdlist ne "*$table\n" ? 1 : 0;
4192
4193     $cmdlist .= "COMMIT\n";
4194
4195     return wantarray ? ($cmdlist, $changes) : $cmdlist;
4196 }
4197
4198 my $pve_ebtables_chainname_regex = qr/PVEFW-\S+|(?:tap|veth)\d+i\d+-(?:IN|OUT)/;
4199
4200 sub get_ebtables_cmdlist {
4201     my ($ruleset) = @_;
4202
4203     my $changes = 0;
4204     my $cmdlist = "*filter\n";
4205
4206     my $active_chains = ebtables_get_chains();
4207     my $statushash = get_ruleset_status($ruleset, $active_chains,
4208                                         \&iptables_chain_digest,
4209                                         $pve_ebtables_chainname_regex);
4210
4211     # create chains first and make sure PVE rules are evaluated if active
4212     my $append_pve_to_forward = '-A FORWARD -j PVEFW-FORWARD';
4213     my $pve_include = 0;
4214     foreach my $chain (sort keys %$statushash) {
4215         next if ($statushash->{$chain}->{action} eq 'delete');
4216         my $policy = $statushash->{$chain}->{policy} // 'ACCEPT';
4217         $cmdlist .= ":$chain $policy\n";
4218         $pve_include = 1 if ($chain eq 'PVEFW-FORWARD');
4219     }
4220
4221     foreach my $chain (sort keys %$statushash) {
4222         my $stat = $statushash->{$chain};
4223         $changes = 1 if ($stat->{action} !~ 'ignore|exists');
4224         next if ($stat->{action} eq 'delete');
4225
4226         foreach my $cmd (@{$statushash->{$chain}->{'rules'}}) {
4227             if ($chain eq 'FORWARD' && $cmd eq $append_pve_to_forward) {
4228                 next if ! $pve_include;
4229                 $pve_include = 0;
4230             }
4231             $cmdlist .= "$cmd\n";
4232         }
4233     }
4234     $cmdlist .= "$append_pve_to_forward\n" if $pve_include;
4235
4236     return wantarray ? ($cmdlist, $changes) : $cmdlist;
4237 }
4238
4239 sub get_ipset_cmdlist {
4240     my ($ruleset) = @_;
4241
4242     my $cmdlist = "";
4243
4244     my $delete_cmdlist = "";
4245
4246     my $active_chains = ipset_get_chains();
4247     my $statushash = get_ruleset_status($ruleset, $active_chains, \&ipset_chain_digest);
4248
4249     # remove stale _swap chains
4250     foreach my $chain (keys %$active_chains) {
4251         if ($chain =~ m/^PVEFW-\S+_swap$/) {
4252             $cmdlist .= "destroy $chain\n";
4253         }
4254     }
4255
4256     foreach my $chain (keys %$ruleset) {
4257         my $stat = $statushash->{$chain};
4258         die "internal error" if !$stat;
4259
4260         if ($stat->{action} eq 'create') {
4261             foreach my $cmd (@{$ruleset->{$chain}}) {
4262                 $cmdlist .= "$cmd\n";
4263             }
4264         }
4265     }
4266
4267     foreach my $chain (keys %$ruleset) {
4268         my $stat = $statushash->{$chain};
4269         die "internal error" if !$stat;
4270
4271         if ($stat->{action} eq 'update') {
4272             my $chain_swap = $chain."_swap";
4273
4274             foreach my $cmd (@{$ruleset->{$chain}}) {
4275                 $cmd =~ s/$chain/$chain_swap/;
4276                 $cmdlist .= "$cmd\n";
4277             }
4278             $cmdlist .= "swap $chain_swap $chain\n";
4279             $cmdlist .= "flush $chain_swap\n";
4280             $cmdlist .= "destroy $chain_swap\n";
4281         }
4282     }
4283
4284      # the remove unused chains
4285     foreach my $chain (keys %$statushash) {
4286         next if $statushash->{$chain}->{action} ne 'delete';
4287
4288         $delete_cmdlist .= "flush $chain\n";
4289         $delete_cmdlist .= "destroy $chain\n";
4290     }
4291
4292     my $changes = ($cmdlist || $delete_cmdlist) ? 1 : 0;
4293
4294     return ($cmdlist, $delete_cmdlist, $changes);
4295 }
4296
4297 sub apply_ruleset {
4298     my ($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $ebtables_ruleset) = @_;
4299
4300     enable_bridge_firewall();
4301
4302     my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
4303         get_ipset_cmdlist($ipset_ruleset);
4304
4305     my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset->{filter});
4306     my ($cmdlistv6, $changesv6) = get_ruleset_cmdlist($rulesetv6->{filter}, "ip6tables");
4307     my ($ebtables_cmdlist, $ebtables_changes) = get_ebtables_cmdlist($ebtables_ruleset);
4308     my ($cmdlist_raw, $changes_raw) = get_ruleset_cmdlist($ruleset->{raw}, undef, 'raw');
4309     my ($cmdlistv6_raw, $changesv6_raw) = get_ruleset_cmdlist($rulesetv6->{raw}, "ip6tables", 'raw');
4310
4311     if ($verbose) {
4312         if ($ipset_changes) {
4313             print "ipset changes:\n";
4314             print $ipset_create_cmdlist if $ipset_create_cmdlist;
4315             print $ipset_delete_cmdlist if $ipset_delete_cmdlist;
4316         }
4317
4318         if ($changes) {
4319             print "iptables changes:\n";
4320             print $cmdlist;
4321         }
4322
4323         if ($changesv6) {
4324             print "ip6tables changes:\n";
4325             print $cmdlistv6;
4326         }
4327
4328         if ($changes_raw) {
4329             print "iptables table raw changes:\n";
4330             print $cmdlist_raw;
4331         }
4332
4333         if ($changesv6_raw) {
4334             print "ip6tables table raw changes:\n";
4335             print $cmdlistv6_raw;
4336         }
4337
4338         if ($ebtables_changes) {
4339             print "ebtables changes:\n";
4340             print $ebtables_cmdlist;
4341         }
4342     }
4343
4344     my $tmpfile = "$pve_fw_status_dir/ipsetcmdlist1";
4345     PVE::Tools::file_set_contents($tmpfile, $ipset_create_cmdlist || '');
4346
4347     ipset_restore_cmdlist($ipset_create_cmdlist);
4348
4349     $tmpfile = "$pve_fw_status_dir/ip4cmdlist";
4350     PVE::Tools::file_set_contents($tmpfile, $cmdlist || '');
4351
4352     iptables_restore_cmdlist($cmdlist);
4353
4354     $tmpfile = "$pve_fw_status_dir/ip4cmdlistraw";
4355     PVE::Tools::file_set_contents($tmpfile, $cmdlist_raw || '');
4356
4357     iptables_restore_cmdlist($cmdlist_raw, 'raw');
4358
4359     $tmpfile = "$pve_fw_status_dir/ip6cmdlist";
4360     PVE::Tools::file_set_contents($tmpfile, $cmdlistv6 || '');
4361
4362     ip6tables_restore_cmdlist($cmdlistv6);
4363
4364     $tmpfile = "$pve_fw_status_dir/ip6cmdlistraw";
4365     PVE::Tools::file_set_contents($tmpfile, $cmdlistv6_raw || '');
4366
4367     ip6tables_restore_cmdlist($cmdlistv6_raw, 'raw');
4368
4369     $tmpfile = "$pve_fw_status_dir/ipsetcmdlist2";
4370     PVE::Tools::file_set_contents($tmpfile, $ipset_delete_cmdlist || '');
4371
4372     ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
4373
4374     ebtables_restore_cmdlist($ebtables_cmdlist);
4375
4376     $tmpfile = "$pve_fw_status_dir/ebtablescmdlist";
4377     PVE::Tools::file_set_contents($tmpfile, $ebtables_cmdlist || '');
4378
4379     # test: re-read status and check if everything is up to date
4380     my $ruleset_filter = $ruleset->{filter};
4381     my $active_chains = iptables_get_chains();
4382     my $statushash = get_ruleset_status($ruleset_filter, $active_chains, \&iptables_chain_digest);
4383
4384     my $errors;
4385     foreach my $chain (sort keys %$ruleset_filter) {
4386         my $stat = $statushash->{$chain};
4387         if ($stat->{action} ne 'exists') {
4388             warn "unable to update chain '$chain'\n";
4389             $errors = 1;
4390         }
4391     }
4392
4393     my $rulesetv6_filter = $rulesetv6->{filter};
4394     my $active_chainsv6 = iptables_get_chains("ip6tables");
4395     my $statushashv6 = get_ruleset_status($rulesetv6_filter, $active_chainsv6, \&iptables_chain_digest);
4396
4397     foreach my $chain (sort keys %$rulesetv6_filter) {
4398         my $stat = $statushashv6->{$chain};
4399         if ($stat->{action} ne 'exists') {
4400             warn "unable to update chain '$chain'\n";
4401             $errors = 1;
4402         }
4403     }
4404
4405     my $ruleset_raw = $ruleset->{raw};
4406     my $active_chains_raw = iptables_get_chains(undef, 'raw');
4407     my $statushash_raw = get_ruleset_status($ruleset_raw, $active_chains_raw, \&iptables_chain_digest);
4408
4409     foreach my $chain (sort keys %$ruleset_raw) {
4410         my $stat = $statushash_raw->{$chain};
4411         if ($stat->{action} ne 'exists') {
4412             warn "unable to update chain '$chain'\n";
4413             $errors = 1;
4414         }
4415     }
4416
4417     my $rulesetv6_raw = $rulesetv6->{raw};
4418     my $active_chainsv6_raw = iptables_get_chains("ip6tables", 'raw');
4419     my $statushashv6_raw = get_ruleset_status($rulesetv6_raw, $active_chainsv6_raw, \&iptables_chain_digest);
4420
4421     foreach my $chain (sort keys %$rulesetv6_raw) {
4422         my $stat = $statushashv6_raw->{$chain};
4423         if ($stat->{action} ne 'exists') {
4424             warn "unable to update chain '$chain'\n";
4425             $errors = 1;
4426         }
4427     }
4428
4429     my $active_ebtables_chains = ebtables_get_chains();
4430     my $ebtables_statushash = get_ruleset_status($ebtables_ruleset,
4431                                 $active_ebtables_chains, \&iptables_chain_digest,
4432                                 $pve_ebtables_chainname_regex);
4433
4434     foreach my $chain (sort keys %$ebtables_ruleset) {
4435         my $stat = $ebtables_statushash->{$chain};
4436         if ($stat->{action} ne 'exists') {
4437             warn "ebtables : unable to update chain '$chain'\n";
4438             $errors = 1;
4439         }
4440     }
4441
4442     die "unable to apply firewall changes\n" if $errors;
4443
4444     update_nf_conntrack_max($hostfw_conf);
4445
4446     update_nf_conntrack_tcp_timeout_established($hostfw_conf);
4447
4448     update_nf_conntrack_tcp_timeout_syn_recv($hostfw_conf);
4449
4450     update_nf_conntrack_logging($hostfw_conf);
4451 }
4452
4453 sub update_nf_conntrack_max {
4454     my ($hostfw_conf) = @_;
4455
4456     my $max = 262144; # reasonable default (2^16 * 4), see nf_conntrack-sysctl docs
4457
4458     my $options = $hostfw_conf->{options} || {};
4459
4460     if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
4461         $max = $options->{nf_conntrack_max};
4462         $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
4463     }
4464
4465     my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
4466     my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
4467
4468     my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
4469
4470     if ($current != $max) {
4471         my $hashsize = int($max/4);
4472         PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
4473         PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
4474     }
4475 }
4476
4477 sub update_nf_conntrack_tcp_timeout_established {
4478     my ($hostfw_conf) = @_;
4479
4480     my $options = $hostfw_conf->{options} || {};
4481
4482     my $value = defined($options->{nf_conntrack_tcp_timeout_established}) ? $options->{nf_conntrack_tcp_timeout_established} : 432000;
4483
4484     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established", $value);
4485 }
4486
4487 sub update_nf_conntrack_tcp_timeout_syn_recv {
4488     my ($hostfw_conf) = @_;
4489
4490     my $options = $hostfw_conf->{options} || {};
4491
4492     my $value = defined($options->{nf_conntrack_tcp_timeout_syn_recv}) ? $options->{nf_conntrack_tcp_timeout_syn_recev} : 60;
4493
4494     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_syn_recv", $value);
4495 }
4496
4497 my $log_nf_conntrack_enabled = undef;
4498 sub update_nf_conntrack_logging {
4499     my ($hostfw_conf) = @_;
4500
4501     my $options = $hostfw_conf->{options} || {};
4502     my $value = $options->{log_nf_conntrack} || 0;
4503     if (!defined($log_nf_conntrack_enabled)
4504         || $value != $log_nf_conntrack_enabled)
4505     {
4506         my $tmpfile = "$pve_fw_status_dir/log_nf_conntrack";
4507         PVE::Tools::file_set_contents($tmpfile, $value);
4508
4509         run_command([qw(systemctl try-reload-or-restart pvefw-logger.service)]);
4510         $log_nf_conntrack_enabled = $value;
4511     }
4512 }
4513
4514 sub remove_pvefw_chains {
4515
4516     PVE::Firewall::remove_pvefw_chains_iptables("iptables");
4517     PVE::Firewall::remove_pvefw_chains_iptables("ip6tables");
4518     PVE::Firewall::remove_pvefw_chains_iptables("iptables", "raw");
4519     PVE::Firewall::remove_pvefw_chains_iptables("ip6tables", "raw");
4520     PVE::Firewall::remove_pvefw_chains_ipset();
4521     PVE::Firewall::remove_pvefw_chains_ebtables();
4522
4523 }
4524
4525 sub remove_pvefw_chains_iptables {
4526     my ($iptablescmd, $table) = @_;
4527
4528     $table = 'filter' if !$table;
4529
4530     my ($chash, $hooks) = iptables_get_chains($iptablescmd, $table);
4531     my $cmdlist = "*$table\n";
4532
4533     foreach my $h (qw(INPUT OUTPUT FORWARD PREROUTING)) {
4534         if ($hooks->{$h}) {
4535             $cmdlist .= "-D $h -j PVEFW-$h\n";
4536         }
4537     }
4538
4539     foreach my $chain (keys %$chash) {
4540         $cmdlist .= "-F $chain\n";
4541     }
4542
4543     foreach my $chain (keys %$chash) {
4544         $cmdlist .= "-X $chain\n";
4545     }
4546     $cmdlist .= "COMMIT\n";
4547
4548     if($iptablescmd eq "ip6tables") {
4549         ip6tables_restore_cmdlist($cmdlist, $table);
4550     } else {
4551         iptables_restore_cmdlist($cmdlist, $table);
4552     }
4553 }
4554
4555 sub remove_pvefw_chains_ipset {
4556
4557     my $ipset_chains = ipset_get_chains();
4558
4559     my $cmdlist = "";
4560
4561     foreach my $chain (keys %$ipset_chains) {
4562         $cmdlist .= "flush $chain\n";
4563         $cmdlist .= "destroy $chain\n";
4564     }
4565
4566     ipset_restore_cmdlist($cmdlist) if $cmdlist;
4567 }
4568
4569 sub remove_pvefw_chains_ebtables {
4570     # apply empty ruleset = remove all our chains
4571     ebtables_restore_cmdlist(get_ebtables_cmdlist({}));
4572 }
4573
4574 sub init {
4575     my $cluster_conf = load_clusterfw_conf();
4576     my $cluster_options = $cluster_conf->{options};
4577     my $enable = $cluster_options->{enable};
4578
4579     return if !$enable;
4580
4581     # load required modules here
4582 }
4583
4584 sub update {
4585     my $code = sub {
4586
4587         my $cluster_conf = load_clusterfw_conf();
4588         my $cluster_options = $cluster_conf->{options};
4589
4590         if (!$cluster_options->{enable}) {
4591             PVE::Firewall::remove_pvefw_chains();
4592             return;
4593         }
4594
4595         my $hostfw_conf = load_hostfw_conf($cluster_conf);
4596
4597         my ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset) = compile($cluster_conf, $hostfw_conf);
4598
4599         apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
4600     };
4601
4602     run_locked($code);
4603 }
4604
4605 1;