src/PVE/Firewall.pm

   1 package PVE::Firewall;
   2
   3 use warnings;
   4 use strict;
   5
   6 use Digest::SHA;
   7 use Encode;
   8 use File::Basename;
   9 use File::Path;
  10 use IO::File;
  11 use Net::IP;
  12 use POSIX;
  13 use Socket qw(AF_INET AF_INET6 inet_ntop inet_pton);
  14 use Storable qw(dclone);
  15
  16 use PVE::Cluster;
  17 use PVE::Corosync;
  18 use PVE::Exception qw(raise raise_param_exc);
  19 use PVE::INotify;
  20 use PVE::JSONSchema qw(register_standard_option get_standard_option);
  21 use PVE::Network;
  22 use PVE::ProcFSTools;
  23 use PVE::SafeSyslog;
  24 use PVE::Tools qw($IPV4RE $IPV6RE);
  25 use PVE::Tools qw(run_command lock_file dir_glob_foreach);
  26
  27 my $pvefw_conf_dir = "/etc/pve/firewall";
  28 my $clusterfw_conf_filename = "$pvefw_conf_dir/cluster.fw";
  29
  30 # dynamically include PVE::QemuServer and PVE::LXC
  31 # to avoid dependency problems
  32 my $have_qemu_server;
  33 eval {
  34     require PVE::QemuServer;
  35     require PVE::QemuConfig;
  36     $have_qemu_server = 1;
  37 };
  38
  39 my $have_lxc;
  40 eval {
  41     require PVE::LXC;
  42     $have_lxc = 1;
  43 };
  44
  45 my $pve_fw_status_dir = "/var/lib/pve-firewall";
  46
  47 mkdir $pve_fw_status_dir; # make sure this exists
  48
  49 my $security_group_name_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  50 my $ipset_name_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  51 our $ip_alias_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  52
  53 my $max_alias_name_length = 64;
  54 my $max_ipset_name_length = 64;
  55 my $max_group_name_length = 18;
  56
  57 my $PROTOCOLS_WITH_PORTS = {
  58     udp => 1,     17 => 1,
  59     udplite => 1, 136 => 1,
  60     tcp => 1,     6 => 1,
  61     dccp => 1,    33 => 1,
  62     sctp => 1,    132 => 1,
  63 };
  64
  65 PVE::JSONSchema::register_format('IPorCIDR', \&pve_verify_ip_or_cidr);
  66 sub pve_verify_ip_or_cidr {
  67     my ($cidr, $noerr) = @_;
  68
  69     if ($cidr =~ m!^(?:$IPV6RE|$IPV4RE)(/(\d+))?$!) {
  70         return $cidr if Net::IP->new($cidr);
  71         return undef if $noerr;
  72         die Net::IP::Error() . "\n";
  73     }
  74     return undef if $noerr;
  75     die "value does not look like a valid IP address or CIDR network\n";
  76 }
  77
  78 PVE::JSONSchema::register_format('IPorCIDRorAlias', \&pve_verify_ip_or_cidr_or_alias);
  79 sub pve_verify_ip_or_cidr_or_alias {
  80     my ($cidr, $noerr) = @_;
  81
  82     return if $cidr =~ m/^(?:$ip_alias_pattern)$/;
  83
  84     return pve_verify_ip_or_cidr($cidr, $noerr);
  85 }
  86
  87 PVE::JSONSchema::register_standard_option('ipset-name', {
  88     description => "IP set name.",
  89     type => 'string',
  90     pattern => $ipset_name_pattern,
  91     minLength => 2,
  92     maxLength => $max_ipset_name_length,
  93 });
  94
  95 PVE::JSONSchema::register_standard_option('pve-fw-alias', {
  96     description => "Alias name.",
  97     type => 'string',
  98     pattern => $ip_alias_pattern,
  99     minLength => 2,
 100     maxLength => $max_alias_name_length,
 101 });
 102
 103 PVE::JSONSchema::register_standard_option('pve-fw-loglevel' => {
 104     description => "Log level.",
 105     type => 'string',
 106     enum => ['emerg', 'alert', 'crit', 'err', 'warning', 'notice', 'info', 'debug', 'nolog'],
 107     optional => 1,
 108 });
 109
 110 PVE::JSONSchema::register_standard_option('pve-security-group-name', {
 111     description => "Security Group name.",
 112     type => 'string',
 113     pattern => $security_group_name_pattern,
 114     minLength => 2,
 115     maxLength => $max_group_name_length,
 116 });
 117
 118 my $feature_ipset_nomatch = 0;
 119 eval  {
 120     my (undef, undef, $release) = POSIX::uname();
 121     if ($release =~ m/^(\d+)\.(\d+)\.\d+-/) {
 122         my ($major, $minor) = ($1, $2);
 123         $feature_ipset_nomatch = 1 if ($major > 3) ||
 124             ($major == 3 && $minor >= 7);
 125     }
 126
 127 };
 128
 129 my $nodename = PVE::INotify::nodename();
 130 my $hostfw_conf_filename = "/etc/pve/nodes/$nodename/host.fw";
 131
 132 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
 133
 134 my $default_log_level = 'nolog'; # avoid logs by default
 135 my $global_log_ratelimit = '--limit 1/sec';
 136
 137 my $log_level_hash = {
 138     debug => 7,
 139     info => 6,
 140     notice => 5,
 141     warning => 4,
 142     err => 3,
 143     crit => 2,
 144     alert => 1,
 145     emerg => 0,
 146 };
 147
 148 my $verbose = 0;
 149 sub set_verbose {
 150     $verbose = shift;
 151 }
 152
 153 # %rule
 154 #
 155 # name => optional
 156 # enable => [0|1]
 157 # action =>
 158 # proto =>
 159 # sport => port[,port[,port]].. or port:port
 160 # dport => port[,port[,port]].. or port:port
 161 # log => optional, loglevel
 162 # logmsg => optional, logmsg - overwrites default
 163 # iface_in => incomin interface
 164 # iface_out => outgoing interface
 165 # match => optional, overwrites generation of match
 166 # target => optional, overwrites action
 167
 168 # we need to overwrite some macros for ipv6
 169 my $pve_ipv6fw_macros = {
 170     'Ping' => [
 171         { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
 172     ],
 173     'NeighborDiscovery' => [
 174         "IPv6 neighbor solicitation, neighbor and router advertisement",
 175         { action => 'PARAM', proto => 'icmpv6', dport => 'router-solicitation' },
 176         { action => 'PARAM', proto => 'icmpv6', dport => 'router-advertisement' },
 177         { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-solicitation' },
 178         { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-advertisement' },
 179     ],
 180     'DHCPv6' => [
 181         "DHCPv6 traffic",
 182         { action => 'PARAM', proto => 'udp', dport => '546:547', sport => '546:547' },
 183     ],
 184     'Trcrt' => [
 185         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 186         { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
 187     ],
 188  };
 189
 190 # imported/converted from: /usr/share/shorewall/macro.*
 191 my $pve_fw_macros = {
 192     'Amanda' => [
 193         "Amanda Backup",
 194         { action => 'PARAM', proto => 'udp', dport => '10080' },
 195         { action => 'PARAM', proto => 'tcp', dport => '10080' },
 196     ],
 197     'Auth' => [
 198         "Auth (identd) traffic",
 199         { action => 'PARAM', proto => 'tcp', dport => '113' },
 200     ],
 201     'BGP' => [
 202         "Border Gateway Protocol traffic",
 203         { action => 'PARAM', proto => 'tcp', dport => '179' },
 204     ],
 205     'BitTorrent' => [
 206         "BitTorrent traffic for BitTorrent 3.1 and earlier",
 207         { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
 208         { action => 'PARAM', proto => 'udp', dport => '6881' },
 209     ],
 210     'BitTorrent32' => [
 211         "BitTorrent traffic for BitTorrent 3.2 and later",
 212         { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
 213         { action => 'PARAM', proto => 'udp', dport => '6881' },
 214     ],
 215     'Ceph' => [
 216         "Ceph Storage Cluster traffic (Ceph Monitors, OSD & MDS Deamons)",
 217         # Legacy port for protocol v1
 218         { action => 'PARAM', proto => 'tcp', dport => '6789' },
 219         # New port for protocol v2
 220         { action => 'PARAM', proto => 'tcp', dport => '3300' },
 221         { action => 'PARAM', proto => 'tcp', dport => '6800:7300' },
 222     ],
 223     'CVS' => [
 224         "Concurrent Versions System pserver traffic",
 225         { action => 'PARAM', proto => 'tcp', dport => '2401' },
 226     ],
 227     'Citrix' => [
 228         "Citrix/ICA traffic (ICA, ICA Browser, CGP)",
 229         { action => 'PARAM', proto => 'tcp', dport => '1494' },
 230         { action => 'PARAM', proto => 'udp', dport => '1604' },
 231         { action => 'PARAM', proto => 'tcp', dport => '2598' },
 232     ],
 233     'DAAP' => [
 234         "Digital Audio Access Protocol traffic (iTunes, Rythmbox daemons)",
 235         { action => 'PARAM', proto => 'tcp', dport => '3689' },
 236         { action => 'PARAM', proto => 'udp', dport => '3689' },
 237     ],
 238     'DCC' => [
 239         "Distributed Checksum Clearinghouse spam filtering mechanism",
 240         { action => 'PARAM', proto => 'tcp', dport => '6277' },
 241     ],
 242     'DHCPfwd' => [
 243         "Forwarded DHCP traffic",
 244         { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
 245     ],
 246     'DNS' => [
 247         "Domain Name System traffic (upd and tcp)",
 248         { action => 'PARAM', proto => 'udp', dport => '53' },
 249         { action => 'PARAM', proto => 'tcp', dport => '53' },
 250     ],
 251     'Distcc' => [
 252         "Distributed Compiler service",
 253         { action => 'PARAM', proto => 'tcp', dport => '3632' },
 254     ],
 255     'FTP' => [
 256         "File Transfer Protocol",
 257         { action => 'PARAM', proto => 'tcp', dport => '21' },
 258     ],
 259     'Finger' => [
 260         "Finger protocol (RFC 742)",
 261         { action => 'PARAM', proto => 'tcp', dport => '79' },
 262     ],
 263     'GNUnet' => [
 264         "GNUnet secure peer-to-peer networking traffic",
 265         { action => 'PARAM', proto => 'tcp', dport => '2086' },
 266         { action => 'PARAM', proto => 'udp', dport => '2086' },
 267         { action => 'PARAM', proto => 'tcp', dport => '1080' },
 268         { action => 'PARAM', proto => 'udp', dport => '1080' },
 269     ],
 270     'GRE' => [
 271         "Generic Routing Encapsulation tunneling protocol",
 272         { action => 'PARAM', proto => '47' },
 273     ],
 274     'Git' => [
 275         "Git distributed revision control traffic",
 276         { action => 'PARAM', proto => 'tcp', dport => '9418' },
 277     ],
 278     'HKP' => [
 279         "OpenPGP HTTP keyserver protocol traffic",
 280         { action => 'PARAM', proto => 'tcp', dport => '11371' },
 281     ],
 282     'HTTP' => [
 283         "Hypertext Transfer Protocol (WWW)",
 284         { action => 'PARAM', proto => 'tcp', dport => '80' },
 285     ],
 286     'HTTPS' => [
 287         "Hypertext Transfer Protocol (WWW) over SSL",
 288         { action => 'PARAM', proto => 'tcp', dport => '443' },
 289     ],
 290     'ICPV2' => [
 291         "Internet Cache Protocol V2 (Squid) traffic",
 292         { action => 'PARAM', proto => 'udp', dport => '3130' },
 293     ],
 294     'ICQ' => [
 295         "AOL Instant Messenger traffic",
 296         { action => 'PARAM', proto => 'tcp', dport => '5190' },
 297     ],
 298     'IMAP' => [
 299         "Internet Message Access Protocol",
 300         { action => 'PARAM', proto => 'tcp', dport => '143' },
 301     ],
 302     'IMAPS' => [
 303         "Internet Message Access Protocol over SSL",
 304         { action => 'PARAM', proto => 'tcp', dport => '993' },
 305     ],
 306     'IPIP' => [
 307         "IPIP capsulation traffic",
 308         { action => 'PARAM', proto => '94' },
 309     ],
 310     'IPsec' => [
 311         "IPsec traffic",
 312         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 313         { action => 'PARAM', proto => '50' },
 314     ],
 315     'IPsecah' => [
 316         "IPsec authentication (AH) traffic",
 317         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 318         { action => 'PARAM', proto => '51' },
 319     ],
 320     'IPsecnat' => [
 321         "IPsec traffic and Nat-Traversal",
 322         { action => 'PARAM', proto => 'udp', dport => '500' },
 323         { action => 'PARAM', proto => 'udp', dport => '4500' },
 324         { action => 'PARAM', proto => '50' },
 325     ],
 326     'IRC' => [
 327         "Internet Relay Chat traffic",
 328         { action => 'PARAM', proto => 'tcp', dport => '6667' },
 329     ],
 330     'Jetdirect' => [
 331         "HP Jetdirect printing",
 332         { action => 'PARAM', proto => 'tcp', dport => '9100' },
 333     ],
 334     'L2TP' => [
 335         "Layer 2 Tunneling Protocol traffic",
 336         { action => 'PARAM', proto => 'udp', dport => '1701' },
 337     ],
 338     'LDAP' => [
 339         "Lightweight Directory Access Protocol traffic",
 340         { action => 'PARAM', proto => 'tcp', dport => '389' },
 341     ],
 342     'LDAPS' => [
 343         "Secure Lightweight Directory Access Protocol traffic",
 344         { action => 'PARAM', proto => 'tcp', dport => '636' },
 345     ],
 346     'MSNP' => [
 347         "Microsoft Notification Protocol",
 348         { action => 'PARAM', proto => 'tcp', dport => '1863' },
 349     ],
 350     'MSSQL' => [
 351         "Microsoft SQL Server",
 352         { action => 'PARAM', proto => 'tcp', dport => '1433' },
 353     ],
 354     'Mail' => [
 355         "Mail traffic (SMTP, SMTPS, Submission)",
 356         { action => 'PARAM', proto => 'tcp', dport => '25' },
 357         { action => 'PARAM', proto => 'tcp', dport => '465' },
 358         { action => 'PARAM', proto => 'tcp', dport => '587' },
 359     ],
 360     'MDNS' => [
 361         "Multicast DNS",
 362         { action => 'PARAM', proto => 'udp', dport => '5353' },
 363     ],
 364     'Munin' => [
 365         "Munin networked resource monitoring traffic",
 366         { action => 'PARAM', proto => 'tcp', dport => '4949' },
 367     ],
 368     'MySQL' => [
 369         "MySQL server",
 370         { action => 'PARAM', proto => 'tcp', dport => '3306' },
 371     ],
 372     'NNTP' => [
 373         "NNTP traffic (Usenet).",
 374         { action => 'PARAM', proto => 'tcp', dport => '119' },
 375     ],
 376     'NNTPS' => [
 377         "Encrypted NNTP traffic (Usenet)",
 378         { action => 'PARAM', proto => 'tcp', dport => '563' },
 379     ],
 380     'NTP' => [
 381         "Network Time Protocol (ntpd)",
 382         { action => 'PARAM', proto => 'udp', dport => '123' },
 383     ],
 384     'OSPF' => [
 385         "OSPF multicast traffic",
 386         { action => 'PARAM', proto => '89' },
 387     ],
 388     'OpenVPN' => [
 389         "OpenVPN traffic",
 390         { action => 'PARAM', proto => 'udp', dport => '1194' },
 391     ],
 392     'PCA' => [
 393         "Symantec PCAnywere (tm)",
 394         { action => 'PARAM', proto => 'udp', dport => '5632' },
 395         { action => 'PARAM', proto => 'tcp', dport => '5631' },
 396     ],
 397     'PMG' => [
 398         "Proxmox Mail Gateway web interface",
 399         { action => 'PARAM', proto => 'tcp', dport => '8006' },
 400     ],
 401     'POP3' => [
 402         "POP3 traffic",
 403         { action => 'PARAM', proto => 'tcp', dport => '110' },
 404     ],
 405     'POP3S' => [
 406         "Encrypted POP3 traffic",
 407         { action => 'PARAM', proto => 'tcp', dport => '995' },
 408     ],
 409     'PPtP' => [
 410         "Point-to-Point Tunneling Protocol",
 411         { action => 'PARAM', proto => '47' },
 412         { action => 'PARAM', proto => 'tcp', dport => '1723' },
 413     ],
 414     'Ping' => [
 415         "ICMP echo request",
 416         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 417     ],
 418     'PostgreSQL' => [
 419         "PostgreSQL server",
 420         { action => 'PARAM', proto => 'tcp', dport => '5432' },
 421     ],
 422     'Printer' => [
 423         "Line Printer protocol printing",
 424         { action => 'PARAM', proto => 'tcp', dport => '515' },
 425     ],
 426     'RDP' => [
 427         "Microsoft Remote Desktop Protocol traffic",
 428         { action => 'PARAM', proto => 'tcp', dport => '3389' },
 429     ],
 430     'RIP' => [
 431         "Routing Information Protocol (bidirectional)",
 432         { action => 'PARAM', proto => 'udp', dport => '520' },
 433     ],
 434     'RNDC' => [
 435         "BIND remote management protocol",
 436         { action => 'PARAM', proto => 'tcp', dport => '953' },
 437     ],
 438     'Razor' => [
 439         "Razor Antispam System",
 440         { action => 'PARAM', proto => 'tcp', dport => '2703' },
 441     ],
 442     'Rdate' => [
 443         "Remote time retrieval (rdate)",
 444         { action => 'PARAM', proto => 'tcp', dport => '37' },
 445     ],
 446     'Rsync' => [
 447         "Rsync server",
 448         { action => 'PARAM', proto => 'tcp', dport => '873' },
 449     ],
 450     'SANE' => [
 451         "SANE network scanning",
 452         { action => 'PARAM', proto => 'tcp', dport => '6566' },
 453     ],
 454     'SMB' => [
 455         "Microsoft SMB traffic",
 456         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 457         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 458         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 459         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 460     ],
 461     'SMBswat' => [
 462         "Samba Web Administration Tool",
 463         { action => 'PARAM', proto => 'tcp', dport => '901' },
 464     ],
 465     'SMTP' => [
 466         "Simple Mail Transfer Protocol",
 467         { action => 'PARAM', proto => 'tcp', dport => '25' },
 468     ],
 469     'SMTPS' => [
 470         "Encrypted Simple Mail Transfer Protocol",
 471         { action => 'PARAM', proto => 'tcp', dport => '465' },
 472     ],
 473     'SNMP' => [
 474         "Simple Network Management Protocol",
 475         { action => 'PARAM', proto => 'udp', dport => '161:162' },
 476         { action => 'PARAM', proto => 'tcp', dport => '161' },
 477     ],
 478     'SPAMD' => [
 479         "Spam Assassin SPAMD traffic",
 480         { action => 'PARAM', proto => 'tcp', dport => '783' },
 481     ],
 482     'SSH' => [
 483         "Secure shell traffic",
 484         { action => 'PARAM', proto => 'tcp', dport => '22' },
 485     ],
 486     'SVN' => [
 487         "Subversion server (svnserve)",
 488         { action => 'PARAM', proto => 'tcp', dport => '3690' },
 489     ],
 490     'SixXS' => [
 491         "SixXS IPv6 Deployment and Tunnel Broker",
 492         { action => 'PARAM', proto => 'tcp', dport => '3874' },
 493         { action => 'PARAM', proto => 'udp', dport => '3740' },
 494         { action => 'PARAM', proto => '41' },
 495         { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
 496     ],
 497     'Squid' => [
 498         "Squid web proxy traffic",
 499         { action => 'PARAM', proto => 'tcp', dport => '3128' },
 500     ],
 501     'Submission' => [
 502         "Mail message submission traffic",
 503         { action => 'PARAM', proto => 'tcp', dport => '587' },
 504     ],
 505     'Syslog' => [
 506         "Syslog protocol (RFC 5424) traffic",
 507         { action => 'PARAM', proto => 'udp', dport => '514' },
 508         { action => 'PARAM', proto => 'tcp', dport => '514' },
 509     ],
 510     'TFTP' => [
 511         "Trivial File Transfer Protocol traffic",
 512         { action => 'PARAM', proto => 'udp', dport => '69' },
 513     ],
 514     'Telnet' => [
 515         "Telnet traffic",
 516         { action => 'PARAM', proto => 'tcp', dport => '23' },
 517     ],
 518     'Telnets' => [
 519         "Telnet over SSL",
 520         { action => 'PARAM', proto => 'tcp', dport => '992' },
 521     ],
 522     'Time' => [
 523         "RFC 868 Time protocol",
 524         { action => 'PARAM', proto => 'tcp', dport => '37' },
 525     ],
 526     'Trcrt' => [
 527         "Traceroute (for up to 30 hops) traffic",
 528         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 529         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 530     ],
 531     'VNC' => [
 532         "VNC traffic for VNC display's 0 - 99",
 533         { action => 'PARAM', proto => 'tcp', dport => '5900:5999' },
 534     ],
 535     'VNCL' => [
 536         "VNC traffic from Vncservers to Vncviewers in listen mode",
 537         { action => 'PARAM', proto => 'tcp', dport => '5500' },
 538     ],
 539     'Web' => [
 540         "WWW traffic (HTTP and HTTPS)",
 541         { action => 'PARAM', proto => 'tcp', dport => '80' },
 542         { action => 'PARAM', proto => 'tcp', dport => '443' },
 543     ],
 544     'Webcache' => [
 545         "Web Cache/Proxy traffic (port 8080)",
 546         { action => 'PARAM', proto => 'tcp', dport => '8080' },
 547     ],
 548     'Webmin' => [
 549         "Webmin traffic",
 550         { action => 'PARAM', proto => 'tcp', dport => '10000' },
 551     ],
 552     'Whois' => [
 553         "Whois (nicname, RFC 3912) traffic",
 554         { action => 'PARAM', proto => 'tcp', dport => '43' },
 555     ],
 556 };
 557
 558 my $pve_fw_parsed_macros;
 559 my $pve_fw_macro_descr;
 560 my $pve_fw_macro_ipversion = {};
 561 my $pve_fw_preferred_macro_names = {};
 562
 563 my $FWACCEPTMARK_ON  = "0x80000000/0x80000000";
 564 my $FWACCEPTMARK_OFF = "0x00000000/0x80000000";
 565
 566 my $pve_std_chains = {};
 567 my $pve_std_chains_conf = {};
 568 $pve_std_chains_conf->{4} = {
 569     'PVEFW-SET-ACCEPT-MARK' => [
 570         { target => "-j MARK --set-mark $FWACCEPTMARK_ON" },
 571     ],
 572     'PVEFW-DropBroadcast' => [
 573         # same as shorewall 'Broadcast'
 574         # simply DROP BROADCAST/MULTICAST/ANYCAST
 575         # we can use this to reduce logging
 576         { action => 'DROP', dsttype => 'BROADCAST' },
 577         { action => 'DROP', dsttype => 'MULTICAST' },
 578         { action => 'DROP', dsttype => 'ANYCAST' },
 579         { action => 'DROP', dest => '224.0.0.0/4' },
 580     ],
 581     'PVEFW-reject' => [
 582         # same as shorewall 'reject'
 583         { action => 'DROP', dsttype => 'BROADCAST' },
 584         { action => 'DROP', source => '224.0.0.0/4' },
 585         { action => 'DROP', proto => 'icmp' },
 586         { match => '-p tcp', target => '-j REJECT --reject-with tcp-reset' },
 587         { match => '-p udp', target => '-j REJECT --reject-with icmp-port-unreachable' },
 588         { match => '-p icmp', target => '-j REJECT --reject-with icmp-host-unreachable' },
 589         { target => '-j REJECT --reject-with icmp-host-prohibited' },
 590     ],
 591     'PVEFW-Drop' => [
 592         # same as shorewall 'Drop', which is equal to DROP,
 593         # but REJECT/DROP some packages to reduce logging,
 594         # and ACCEPT critical ICMP types
 595         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 596         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 597         { action => 'PVEFW-DropBroadcast' },
 598         # ACCEPT critical ICMP types
 599         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 600         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 601         # Drop packets with INVALID state
 602         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 603         # Drop Microsoft SMB noise
 604         { action => 'DROP', proto => 'udp', dport => '135,445' },
 605         { action => 'DROP', proto => 'udp', dport => '137:139' },
 606         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 607         { action => 'DROP', proto => 'tcp', dport => '135,139,445' },
 608         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 609         # Drop new/NotSyn traffic so that it doesn't get logged
 610         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 611         # Drop DNS replies
 612         { action => 'DROP', proto => 'udp', sport => 53 },
 613     ],
 614     'PVEFW-Reject' => [
 615         # same as shorewall 'Reject', which is equal to Reject,
 616         # but REJECT/DROP some packages to reduce logging,
 617         # and ACCEPT critical ICMP types
 618         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 619         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 620         { action => 'PVEFW-DropBroadcast' },
 621         # ACCEPT critical ICMP types
 622         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 623         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 624         # Drop packets with INVALID state
 625         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 626         # Drop Microsoft SMB noise
 627         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445' },
 628         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
 629         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 630         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445' },
 631         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 632         # Drop new/NotSyn traffic so that it doesn't get logged
 633         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 634         # Drop DNS replies
 635         { action => 'DROP', proto => 'udp', sport => 53 },
 636     ],
 637     'PVEFW-tcpflags' => [
 638         # same as shorewall tcpflags action.
 639         # Packets arriving on this interface are checked for som illegal combinations of TCP flags
 640         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG', target => '-g PVEFW-logflags' },
 641         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE', target => '-g PVEFW-logflags' },
 642         { match => '-p tcp -m tcp --tcp-flags SYN,RST SYN,RST', target => '-g PVEFW-logflags' },
 643         { match => '-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN', target => '-g PVEFW-logflags' },
 644         { match => '-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN', target => '-g PVEFW-logflags' },
 645     ],
 646     'PVEFW-smurfs' => [
 647         # same as shorewall smurfs action
 648         # Filter packets for smurfs (packets with a broadcast address as the source).
 649         { match => '-s 0.0.0.0/32', target => '-j RETURN' }, # allow DHCP
 650         { match => '-m addrtype --src-type BROADCAST', target => '-g PVEFW-smurflog' },
 651         { match => '-s 224.0.0.0/4', target => '-g PVEFW-smurflog' },
 652     ],
 653     'PVEFW-smurflog' => [
 654         { action => 'DROP', logmsg => 'DROP: ' },
 655     ],
 656     'PVEFW-logflags' => [
 657         { action => 'DROP', logmsg => 'DROP: ' },
 658     ],
 659 };
 660
 661 $pve_std_chains_conf->{6} = {
 662     'PVEFW-SET-ACCEPT-MARK' => [
 663         { target => "-j MARK --set-mark $FWACCEPTMARK_ON" },
 664     ],
 665     'PVEFW-DropBroadcast' => [
 666         # same as shorewall 'Broadcast'
 667         # simply DROP BROADCAST/MULTICAST/ANYCAST
 668         # we can use this to reduce logging
 669         #{ action => 'DROP', dsttype => 'BROADCAST' }, #no broadcast in ipv6
 670         # ipv6 addrtype does not work with kernel 2.6.32
 671         #{ action => 'DROP', dsttype => 'MULTICAST' },
 672         #{ action => 'DROP', dsttype => 'ANYCAST' },
 673         { action => 'DROP', dest => 'ff00::/8' },
 674         #{ action => 'DROP', dest => '224.0.0.0/4' },
 675     ],
 676     'PVEFW-reject' => [
 677         { action => 'DROP', proto => 'icmpv6' },
 678         { match => '-p tcp', target => '-j REJECT --reject-with tcp-reset' },
 679         { match => '-p udp', target => '-j REJECT --reject-with icmp6-port-unreachable' },
 680         { target => '-j REJECT --reject-with icmp6-adm-prohibited' },
 681     ],
 682     'PVEFW-Drop' => [
 683         # same as shorewall 'Drop', which is equal to DROP,
 684         # but REJECT/DROP some packages to reduce logging,
 685         # and ACCEPT critical ICMP types
 686         { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
 687         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 688         { action => 'PVEFW-DropBroadcast' },
 689         # ACCEPT critical ICMP types
 690         { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
 691         { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
 692         { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
 693         # Drop packets with INVALID state
 694         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 695         # Drop Microsoft SMB noise
 696         { action => 'DROP', proto => 'udp', dport => '135,445' },
 697         { action => 'DROP', proto => 'udp', dport => '137:139'},
 698         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 699         { action => 'DROP', proto => 'tcp', dport => '135,139,445' },
 700         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 701         # Drop new/NotSyn traffic so that it doesn't get logged
 702         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 703         # Drop DNS replies
 704         { action => 'DROP', proto => 'udp', sport => 53 },
 705     ],
 706     'PVEFW-Reject' => [
 707         # same as shorewall 'Reject', which is equal to Reject,
 708         # but REJECT/DROP some packages to reduce logging,
 709         # and ACCEPT critical ICMP types
 710         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 711         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 712         { action => 'PVEFW-DropBroadcast' },
 713         # ACCEPT critical ICMP types
 714         { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
 715         { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
 716         { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
 717         # Drop packets with INVALID state
 718         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 719         # Drop Microsoft SMB noise
 720         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445' },
 721         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139' },
 722         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 723         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445' },
 724         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 725         # Drop new/NotSyn traffic so that it doesn't get logged
 726         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 727         # Drop DNS replies
 728         { action => 'DROP', proto => 'udp', sport => 53 },
 729     ],
 730     'PVEFW-tcpflags' => [
 731         # same as shorewall tcpflags action.
 732         # Packets arriving on this interface are checked for som illegal combinations of TCP flags
 733         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG', target => '-g PVEFW-logflags' },
 734         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE', target => '-g PVEFW-logflags' },
 735         { match => '-p tcp -m tcp --tcp-flags SYN,RST SYN,RST', target => '-g PVEFW-logflags' },
 736         { match => '-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN', target => '-g PVEFW-logflags' },
 737         { match => '-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN', target => '-g PVEFW-logflags' },
 738     ],
 739     'PVEFW-logflags' => [
 740         { action => 'DROP', logmsg => 'DROP: ' },
 741     ],
 742 };
 743
 744 # iptables -p icmp -h
 745 my $icmp_type_names = {
 746     any => 1,
 747     'echo-reply' => 1,
 748     'destination-unreachable' => 1,
 749     'network-unreachable' => 1,
 750     'host-unreachable' => 1,
 751     'protocol-unreachable' => 1,
 752     'port-unreachable' => 1,
 753     'fragmentation-needed' => 1,
 754     'source-route-failed' => 1,
 755     'network-unknown' => 1,
 756     'host-unknown' => 1,
 757     'network-prohibited' => 1,
 758     'host-prohibited' => 1,
 759     'TOS-network-unreachable' => 1,
 760     'TOS-host-unreachable' => 1,
 761     'communication-prohibited' => 1,
 762     'host-precedence-violation' => 1,
 763     'precedence-cutoff' => 1,
 764     'source-quench' => 1,
 765     'redirect' => 1,
 766     'network-redirect' => 1,
 767     'host-redirect' => 1,
 768     'TOS-network-redirect' => 1,
 769     'TOS-host-redirect' => 1,
 770     'echo-request' => 1,
 771     'router-advertisement' => 1,
 772     'router-solicitation' => 1,
 773     'time-exceeded' => 1,
 774     'ttl-zero-during-transit' => 1,
 775     'ttl-zero-during-reassembly' => 1,
 776     'parameter-problem' => 1,
 777     'ip-header-bad' => 1,
 778     'required-option-missing' => 1,
 779     'timestamp-request' => 1,
 780     'timestamp-reply' => 1,
 781     'address-mask-request' => 1,
 782     'address-mask-reply' => 1,
 783 };
 784
 785 # ip6tables -p icmpv6 -h
 786
 787 my $icmpv6_type_names = {
 788     '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 sub init_firewall_macros {
 816
 817     $pve_fw_parsed_macros = {};
 818
 819     my $parse = sub {
 820         my ($k, $macro) = @_;
 821         my $lc_name = lc($k);
 822         $pve_fw_macro_ipversion->{$k} = 0;
 823         while (!ref($macro->[0])) {
 824             my $desc = shift @$macro;
 825             if ($desc eq 'ipv4only') {
 826                 $pve_fw_macro_ipversion->{$k} = 4;
 827             } elsif ($desc eq 'ipv6only') {
 828                 $pve_fw_macro_ipversion->{$k} = 6;
 829             } else {
 830                 $pve_fw_macro_descr->{$k} = $desc;
 831             }
 832         }
 833         $pve_fw_preferred_macro_names->{$lc_name} = $k;
 834         $pve_fw_parsed_macros->{$k} = $macro;
 835     };
 836
 837     foreach my $k (keys %$pve_fw_macros) {
 838         &$parse($k, $pve_fw_macros->{$k});
 839     }
 840
 841     foreach my $k (keys %$pve_ipv6fw_macros) {
 842         next if $pve_fw_parsed_macros->{$k};
 843         &$parse($k, $pve_ipv6fw_macros->{$k});
 844         $pve_fw_macro_ipversion->{$k} = 6;
 845     }
 846 }
 847
 848 init_firewall_macros();
 849
 850 sub get_macros {
 851     return wantarray ? ($pve_fw_parsed_macros, $pve_fw_macro_descr): $pve_fw_parsed_macros;
 852 }
 853
 854 my $etc_services;
 855
 856 sub get_etc_services {
 857
 858     return $etc_services if $etc_services;
 859
 860     my $filename = "/etc/services";
 861
 862     my $fh = IO::File->new($filename, O_RDONLY);
 863     if (!$fh) {
 864         warn "unable to read '$filename' - $!\n";
 865         return {};
 866     }
 867
 868     my $services = {};
 869
 870     while (my $line = <$fh>) {
 871         chomp ($line);
 872         next if $line =~m/^#/;
 873         next if ($line =~m/^\s*$/);
 874
 875         if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp|sctp).*$!) {
 876             $services->{byid}->{$2}->{name} = $1;
 877             $services->{byid}->{$2}->{port} = $2;
 878             $services->{byid}->{$2}->{$3} = 1;
 879             $services->{byname}->{$1} = $services->{byid}->{$2};
 880         }
 881     }
 882
 883     close($fh);
 884
 885     $etc_services = $services;
 886
 887
 888     return $etc_services;
 889 }
 890
 891 sub parse_protocol_file {
 892     my ($filename) = @_;
 893
 894     my $fh = IO::File->new($filename, O_RDONLY);
 895     if (!$fh) {
 896         warn "unable to read '$filename' - $!\n";
 897         return {};
 898     }
 899
 900     my $protocols = {};
 901
 902     while (my $line = <$fh>) {
 903         chomp ($line);
 904         next if $line =~m/^#/;
 905         next if ($line =~m/^\s*$/);
 906
 907         if ($line =~ m!^(\S+)\s+(\d+)(?:\s+.*)?$!) {
 908             $protocols->{byid}->{$2}->{name} = $1;
 909             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
 910         }
 911     }
 912
 913     close($fh);
 914
 915     return $protocols;
 916 }
 917
 918 my $etc_protocols;
 919
 920 sub get_etc_protocols {
 921     return $etc_protocols if $etc_protocols;
 922
 923     my $protocols = parse_protocol_file('/etc/protocols');
 924
 925     # add special case for ICMP v6
 926     $protocols->{byid}->{icmpv6}->{name} = "icmpv6";
 927     $protocols->{byname}->{icmpv6} = $protocols->{byid}->{icmpv6};
 928
 929     $etc_protocols = $protocols;
 930
 931     return $etc_protocols;
 932 }
 933
 934 my $etc_ethertypes;
 935
 936 sub get_etc_ethertypes {
 937     $etc_ethertypes = parse_protocol_file('/etc/ethertypes')
 938         if !$etc_ethertypes;
 939     return $etc_ethertypes;
 940 }
 941
 942 my $__local_network;
 943
 944 sub local_network {
 945     my ($new_value) = @_;
 946
 947     $__local_network = $new_value if defined($new_value);
 948
 949     return $__local_network if defined($__local_network);
 950
 951     eval {
 952         my $nodename = PVE::INotify::nodename();
 953
 954         my $ip = PVE::Cluster::remote_node_ip($nodename);
 955
 956         my $testip = Net::IP->new($ip);
 957
 958         my $isv6 = $testip->version == 6;
 959         my $routes = $isv6 ? PVE::ProcFSTools::read_proc_net_ipv6_route()
 960                            : PVE::ProcFSTools::read_proc_net_route();
 961         foreach my $entry (@$routes) {
 962             my $mask;
 963             if ($isv6) {
 964                 $mask = $entry->{prefix};
 965                 next if !$mask; # skip the default route...
 966             } else {
 967                 $mask = $PVE::Network::ipv4_mask_hash_localnet->{$entry->{mask}};
 968                 next if !defined($mask);
 969             }
 970             my $cidr = "$entry->{dest}/$mask";
 971             my $testnet = Net::IP->new($cidr);
 972             my $overlap = $testnet->overlaps($testip);
 973             if ($overlap == $Net::IP::IP_B_IN_A_OVERLAP ||
 974                 $overlap == $Net::IP::IP_IDENTICAL)
 975             {
 976                 $__local_network = $cidr;
 977                 return;
 978             }
 979         }
 980     };
 981     warn $@ if $@;
 982
 983     return $__local_network;
 984 }
 985
 986 # ipset names are limited to 31 characters,
 987 # and we use '-v4' or '-v6' to indicate IP versions,
 988 # and we use '_swap' suffix for atomic update,
 989 # for example PVEFW-${VMID}-${ipset_name}_swap
 990
 991 my $max_iptables_ipset_name_length = 31 - length("PVEFW-") - length("_swap");
 992
 993 sub compute_ipset_chain_name {
 994     my ($vmid, $ipset_name, $ipversion) = @_;
 995
 996     $vmid = 0 if !defined($vmid);
 997
 998     my $id = "$vmid-${ipset_name}-v$ipversion";
 999
1000     if (length($id) > $max_iptables_ipset_name_length) {
1001         $id = PVE::Tools::fnv31a_hex($id);
1002     }
1003
1004     return "PVEFW-$id";
1005 }
1006
1007 sub compute_ipfilter_ipset_name {
1008     my ($iface) = @_;
1009
1010     return "ipfilter-$iface";
1011 }
1012
1013 sub parse_address_list {
1014     my ($str) = @_;
1015
1016     if ($str =~ m/^(\+)(\S+)$/) { # ipset ref
1017         die "ipset name too long\n" if length($str) > ($max_ipset_name_length + 1);
1018         return;
1019     }
1020
1021     if ($str =~ m/^${ip_alias_pattern}$/) {
1022         die "alias name too long\n" if length($str) > $max_alias_name_length;
1023         return;
1024     }
1025
1026     my $count = 0;
1027     my $iprange = 0;
1028     my $ipversion;
1029
1030     my @elements = split(/,/, $str);
1031     die "extraneous commas in list\n" if $str ne join(',', @elements);
1032     foreach my $elem (@elements) {
1033         $count++;
1034         my $ip = Net::IP->new($elem);
1035         if (!$ip) {
1036             my $err = Net::IP::Error();
1037             die "invalid IP address: $err\n";
1038         }
1039         $iprange = 1 if $elem =~ m/-/;
1040
1041         my $new_ipversion = Net::IP::ip_is_ipv6($ip->ip()) ? 6 : 4;
1042
1043         die "detected mixed ipv4/ipv6 addresses in address list '$str'\n"
1044             if $ipversion && ($new_ipversion != $ipversion);
1045
1046         $ipversion = $new_ipversion;
1047     }
1048
1049     die "you can't use a range in a list\n" if $iprange && $count > 1;
1050
1051     return $ipversion;
1052 }
1053
1054 sub parse_port_name_number_or_range {
1055     my ($str, $dport) = @_;
1056
1057     my $services = PVE::Firewall::get_etc_services();
1058     my $count = 0;
1059     my $icmp_port = 0;
1060
1061     my @elements = split(/,/, $str);
1062     die "extraneous commas in list\n" if $str ne join(',', @elements);
1063     foreach my $item (@elements) {
1064         if ($item =~ m/^([0-9]+):([0-9]+)$/) {
1065             $count += 2;
1066             my ($port1, $port2) = ($1, $2);
1067             die "invalid port '$port1'\n" if $port1 > 65535;
1068             die "invalid port '$port2'\n" if $port2 > 65535;
1069             die "backwards range '$port1:$port2' not allowed, did you mean '$port2:$port1'?\n" if $port1 > $port2;
1070         } elsif ($item =~ m/^([0-9]+)$/) {
1071             $count += 1;
1072             my $port = $1;
1073             die "invalid port '$port'\n" if $port > 65535;
1074         } else {
1075             if ($dport && $icmp_type_names->{$item}) {
1076                 $icmp_port = 1;
1077             } elsif ($dport && $icmpv6_type_names->{$item}) {
1078                 $icmp_port = 1;
1079             } else {
1080                 die "invalid port '$item'\n" if !$services->{byname}->{$item};
1081             }
1082         }
1083     }
1084
1085     die "ICPM ports not allowed in port range\n" if $icmp_port && $count > 0;
1086
1087     # I really don't like to use the word number here, but it's the only thing
1088     # that makes sense in a literal way. The range 1:100 counts as 2, not as
1089     # one and not as 100...
1090     die "too many entries in port list (> 15 numbers)\n"
1091         if $count > 15;
1092
1093     return (scalar(@elements) > 1);
1094 }
1095
1096 PVE::JSONSchema::register_format('pve-fw-sport-spec', \&pve_fw_verify_sport_spec);
1097 sub pve_fw_verify_sport_spec {
1098    my ($portstr) = @_;
1099
1100    parse_port_name_number_or_range($portstr, 0);
1101
1102    return $portstr;
1103 }
1104
1105 PVE::JSONSchema::register_format('pve-fw-dport-spec', \&pve_fw_verify_dport_spec);
1106 sub pve_fw_verify_dport_spec {
1107    my ($portstr) = @_;
1108
1109    parse_port_name_number_or_range($portstr, 1);
1110
1111    return $portstr;
1112 }
1113
1114 PVE::JSONSchema::register_format('pve-fw-addr-spec', \&pve_fw_verify_addr_spec);
1115 sub pve_fw_verify_addr_spec {
1116    my ($list) = @_;
1117
1118    parse_address_list($list);
1119
1120    return $list;
1121 }
1122
1123 PVE::JSONSchema::register_format('pve-fw-protocol-spec', \&pve_fw_verify_protocol_spec);
1124 sub pve_fw_verify_protocol_spec {
1125    my ($proto) = @_;
1126
1127    my $protocols = get_etc_protocols();
1128
1129    die "unknown protocol '$proto'\n" if $proto &&
1130        !(defined($protocols->{byname}->{$proto}) ||
1131          defined($protocols->{byid}->{$proto}));
1132
1133    return $proto;
1134 }
1135
1136
1137 # helper function for API
1138
1139 sub copy_opject_with_digest {
1140     my ($object) = @_;
1141
1142     my $sha = Digest::SHA->new('sha1');
1143
1144     my $res = {};
1145     foreach my $k (sort keys %$object) {
1146         my $v = $object->{$k};
1147         next if !defined($v);
1148         $res->{$k} = $v;
1149         $sha->add($k, ':', $v, "\n");
1150     }
1151
1152     my $digest = $sha->hexdigest;
1153
1154     $res->{digest} = $digest;
1155
1156     return wantarray ? ($res, $digest) : $res;
1157 }
1158
1159 sub copy_list_with_digest {
1160     my ($list) = @_;
1161
1162     my $sha = Digest::SHA->new('sha1');
1163
1164     my $res = [];
1165     foreach my $entry (@$list) {
1166         my $data = {};
1167         foreach my $k (sort keys %$entry) {
1168             my $v = $entry->{$k};
1169             next if !defined($v);
1170             $data->{$k} = $v;
1171             # Note: digest ignores refs ($rule->{errors})
1172             # since Digest::SHA expects a series of bytes,
1173             #  we have to encode the value here to prevent errors when
1174             #  using utf8 characters (eg. in comments)
1175             $sha->add($k, ':', encode_utf8($v), "\n") if !ref($v); ;
1176         }
1177         push @$res, $data;
1178     }
1179
1180     my $digest = $sha->hexdigest;
1181
1182     foreach my $entry (@$res) {
1183         $entry->{digest} = $digest;
1184     }
1185
1186     return wantarray ? ($res, $digest) : $res;
1187 }
1188
1189 our $cluster_option_properties = {
1190     enable => {
1191         description => "Enable or disable the firewall cluster wide.",
1192         type => 'integer',
1193         minimum => 0,
1194         optional => 1,
1195     },
1196     ebtables => {
1197         description => "Enable ebtables rules cluster wide.",
1198         type => 'boolean',
1199         default => 1,
1200         optional => 1,
1201     },
1202     policy_in => {
1203         description => "Input policy.",
1204         type => 'string',
1205         optional => 1,
1206         enum => ['ACCEPT', 'REJECT', 'DROP'],
1207     },
1208     policy_out => {
1209         description => "Output policy.",
1210         type => 'string',
1211         optional => 1,
1212         enum => ['ACCEPT', 'REJECT', 'DROP'],
1213     },
1214     log_ratelimit => {
1215         description => "Log ratelimiting settings",
1216         type => 'string', format => {
1217             enable => {
1218                 default_key => 1,
1219                 description => 'Enable or disable log rate limiting',
1220                 type => 'boolean',
1221                 default => '1',
1222             },
1223             rate => {
1224                 type => 'string',
1225                 description => 'Frequency with which the burst bucket gets refilled',
1226                 optional => 1,
1227                 pattern => '[1-9][0-9]*\/(second|minute|hour|day)',
1228                 format_description => 'rate',
1229                 default => '1/second',
1230             },
1231             burst => {
1232                 type => 'integer',
1233                 minimum => 0,
1234                 optional => 1,
1235                 description => 'Inital burst of packages which will get logged',
1236                 default => 5,
1237             },
1238         },
1239         optional => 1,
1240     },
1241 };
1242
1243 our $host_option_properties = {
1244     enable => {
1245         description => "Enable host firewall rules.",
1246         type => 'boolean',
1247         optional => 1,
1248     },
1249     log_level_in =>  get_standard_option('pve-fw-loglevel', {
1250         description => "Log level for incoming traffic." }),
1251     log_level_out =>  get_standard_option('pve-fw-loglevel', {
1252         description => "Log level for outgoing traffic." }),
1253     tcp_flags_log_level =>  get_standard_option('pve-fw-loglevel', {
1254         description => "Log level for illegal tcp flags filter." }),
1255     smurf_log_level =>  get_standard_option('pve-fw-loglevel', {
1256         description => "Log level for SMURFS filter." }),
1257     nosmurfs => {
1258         description => "Enable SMURFS filter.",
1259         type => 'boolean',
1260         optional => 1,
1261     },
1262     tcpflags => {
1263         description => "Filter illegal combinations of TCP flags.",
1264         type => 'boolean',
1265         default => 0,
1266         optional => 1,
1267     },
1268     nf_conntrack_max => {
1269         description => "Maximum number of tracked connections.",
1270         type => 'integer',
1271         optional => 1,
1272         default => 262144,
1273         minimum => 32768,
1274     },
1275     nf_conntrack_tcp_timeout_established => {
1276         description => "Conntrack established timeout.",
1277         type => 'integer',
1278         optional => 1,
1279         default => 432000,
1280         minimum => 7875,
1281     },
1282     nf_conntrack_tcp_timeout_syn_recv => {
1283         description => "Conntrack syn recv timeout.",
1284         type => 'integer',
1285         optional => 1,
1286         default => 60,
1287         minimum => 30,
1288         maximum => 60,
1289     },
1290     ndp => {
1291         description => "Enable NDP (Neighbor Discovery Protocol).",
1292         type => 'boolean',
1293         default => 0,
1294         optional => 1,
1295     },
1296     nf_conntrack_allow_invalid => {
1297         description => "Allow invalid packets on connection tracking.",
1298         type => 'boolean',
1299         default => 0,
1300         optional => 1,
1301     },
1302     protection_synflood => {
1303         description => "Enable synflood protection",
1304         type => 'boolean',
1305         default => 0,
1306         optional => 1,
1307     },
1308     protection_synflood_rate => {
1309         description => "Synflood protection rate syn/sec by ip src.",
1310         type => 'integer',
1311         optional => 1,
1312         default => 200,
1313     },
1314     protection_synflood_burst => {
1315         description => "Synflood protection rate burst by ip src.",
1316         type => 'integer',
1317         optional => 1,
1318         default => 1000,
1319     },
1320     log_nf_conntrack => {
1321         description => "Enable logging of conntrack information.",
1322         type => 'boolean',
1323         default => 0,
1324         optional => 1
1325     },
1326 };
1327
1328 our $vm_option_properties = {
1329     enable => {
1330         description => "Enable/disable firewall rules.",
1331         type => 'boolean',
1332         default => 0,
1333         optional => 1,
1334     },
1335     macfilter => {
1336         description => "Enable/disable MAC address filter.",
1337         type => 'boolean',
1338         default => 0,
1339         optional => 1,
1340     },
1341     dhcp => {
1342         description => "Enable DHCP.",
1343         type => 'boolean',
1344         default => 0,
1345         optional => 1,
1346     },
1347     ndp => {
1348         description => "Enable NDP (Neighbor Discovery Protocol).",
1349         type => 'boolean',
1350         default => 0,
1351         optional => 1,
1352     },
1353     radv => {
1354         description => "Allow sending Router Advertisement.",
1355         type => 'boolean',
1356         optional => 1,
1357     },
1358     ipfilter => {
1359         description => "Enable default IP filters. " .
1360            "This is equivalent to adding an empty ipfilter-net<id> ipset " .
1361            "for every interface. Such ipsets implicitly contain sane default " .
1362            "restrictions such as restricting IPv6 link local addresses to " .
1363            "the one derived from the interface's MAC address. For containers " .
1364            "the configured IP addresses will be implicitly added.",
1365         type => 'boolean',
1366         optional => 1,
1367     },
1368     policy_in => {
1369         description => "Input policy.",
1370         type => 'string',
1371         optional => 1,
1372         enum => ['ACCEPT', 'REJECT', 'DROP'],
1373     },
1374     policy_out => {
1375         description => "Output policy.",
1376         type => 'string',
1377         optional => 1,
1378         enum => ['ACCEPT', 'REJECT', 'DROP'],
1379     },
1380     log_level_in =>  get_standard_option('pve-fw-loglevel', {
1381         description => "Log level for incoming traffic." }),
1382     log_level_out =>  get_standard_option('pve-fw-loglevel', {
1383         description => "Log level for outgoing traffic." }),
1384
1385 };
1386
1387
1388 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.";
1389
1390 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.";
1391
1392 my $rule_properties = {
1393     pos => {
1394         description => "Update rule at position <pos>.",
1395         type => 'integer',
1396         minimum => 0,
1397         optional => 1,
1398     },
1399     digest => get_standard_option('pve-config-digest'),
1400     type => {
1401         description => "Rule type.",
1402         type => 'string',
1403         optional => 1,
1404         enum => ['in', 'out', 'group'],
1405     },
1406     action => {
1407         description => "Rule action ('ACCEPT', 'DROP', 'REJECT') or security group name.",
1408         type => 'string',
1409         optional => 1,
1410         pattern => $security_group_name_pattern,
1411         maxLength => 20,
1412         minLength => 2,
1413     },
1414     macro => {
1415         description => "Use predefined standard macro.",
1416         type => 'string',
1417         optional => 1,
1418         maxLength => 128,
1419     },
1420     iface => get_standard_option('pve-iface', {
1421         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.",
1422         optional => 1
1423     }),
1424     source => {
1425         description => "Restrict packet source address. $addr_list_descr",
1426         type => 'string', format => 'pve-fw-addr-spec',
1427         optional => 1,
1428     },
1429     dest => {
1430         description => "Restrict packet destination address. $addr_list_descr",
1431         type => 'string', format => 'pve-fw-addr-spec',
1432         optional => 1,
1433     },
1434     proto => {
1435         description => "IP protocol. You can use protocol names ('tcp'/'udp') or simple numbers, as defined in '/etc/protocols'.",
1436         type => 'string', format => 'pve-fw-protocol-spec',
1437         optional => 1,
1438     },
1439     enable => {
1440         description => "Flag to enable/disable a rule.",
1441         type => 'integer',
1442         minimum => 0,
1443         optional => 1,
1444     },
1445     log => get_standard_option('pve-fw-loglevel', {
1446         description => "Log level for firewall rule.",
1447     }),
1448     sport => {
1449         description => "Restrict TCP/UDP source port. $port_descr",
1450         type => 'string', format => 'pve-fw-sport-spec',
1451         optional => 1,
1452     },
1453     dport => {
1454         description => "Restrict TCP/UDP destination port. $port_descr",
1455         type => 'string', format => 'pve-fw-dport-spec',
1456         optional => 1,
1457     },
1458     comment => {
1459         description => "Descriptive comment.",
1460         type => 'string',
1461         optional => 1,
1462     },
1463 };
1464
1465 sub add_rule_properties {
1466     my ($properties) = @_;
1467
1468     foreach my $k (keys %$rule_properties) {
1469         my $h = $rule_properties->{$k};
1470         # copy data, so that we can modify later without side effects
1471         foreach my $opt (keys %$h) { $properties->{$k}->{$opt} = $h->{$opt}; }
1472     }
1473
1474     return $properties;
1475 }
1476
1477 sub delete_rule_properties {
1478     my ($rule, $delete_str) = @_;
1479
1480     foreach my $opt (PVE::Tools::split_list($delete_str)) {
1481         raise_param_exc({ 'delete' => "no such property ('$opt')"})
1482             if !defined($rule_properties->{$opt});
1483         raise_param_exc({ 'delete' => "unable to delete required property '$opt'"})
1484             if $opt eq 'type' || $opt eq 'action';
1485         delete $rule->{$opt};
1486     }
1487
1488     return $rule;
1489 }
1490
1491 my $apply_macro = sub {
1492     my ($macro_name, $param, $verify, $ipversion) = @_;
1493
1494     my $macro_rules = $pve_fw_parsed_macros->{$macro_name};
1495     die "unknown macro '$macro_name'\n" if !$macro_rules; # should not happen
1496
1497     if ($ipversion && ($ipversion == 6) && $pve_ipv6fw_macros->{$macro_name}) {
1498         $macro_rules = $pve_ipv6fw_macros->{$macro_name};
1499     }
1500
1501     # skip macros which are specific to another ipversion
1502     if ($ipversion && (my $required = $pve_fw_macro_ipversion->{$macro_name})) {
1503         return if $ipversion != $required;
1504     }
1505
1506     my $rules = [];
1507
1508     foreach my $templ (@$macro_rules) {
1509         my $rule = {};
1510         my $param_used = {};
1511         foreach my $k (keys %$templ) {
1512             my $v = $templ->{$k};
1513             if ($v eq 'PARAM') {
1514                 $v = $param->{$k};
1515                 $param_used->{$k} = 1;
1516             } elsif ($v eq 'DEST') {
1517                 $v = $param->{dest};
1518                 $param_used->{dest} = 1;
1519             } elsif ($v eq 'SOURCE') {
1520                 $v = $param->{source};
1521                 $param_used->{source} = 1;
1522             }
1523
1524             if (!defined($v)) {
1525                 my $msg = "missing parameter '$k' in macro '$macro_name'";
1526                 raise_param_exc({ macro => $msg }) if $verify;
1527                 die "$msg\n";
1528             }
1529             $rule->{$k} = $v;
1530         }
1531         foreach my $k (keys %$param) {
1532             next if $k eq 'macro';
1533             next if !defined($param->{$k});
1534             next if $param_used->{$k};
1535             if (defined($rule->{$k})) {
1536                 if ($rule->{$k} ne $param->{$k}) {
1537                     my $msg = "parameter '$k' already define in macro (value = '$rule->{$k}')";
1538                     raise_param_exc({ $k => $msg }) if $verify;
1539                     die "$msg\n";
1540                 }
1541             } else {
1542                 $rule->{$k} = $param->{$k};
1543             }
1544         }
1545         push @$rules, $rule;
1546     }
1547
1548     return $rules;
1549 };
1550
1551 my $rule_env_iface_lookup = {
1552     'ct' => 1,
1553     'vm' => 1,
1554     'group' => 0,
1555     'cluster' => 1,
1556     'host' => 1,
1557 };
1558
1559 sub verify_rule {
1560     my ($rule, $cluster_conf, $fw_conf, $rule_env, $noerr) = @_;
1561
1562     my $allow_groups = $rule_env eq 'group' ? 0 : 1;
1563
1564     my $allow_iface = $rule_env_iface_lookup->{$rule_env};
1565     die "unknown rule_env '$rule_env'\n" if !defined($allow_iface); # should not happen
1566
1567     my $errors = $rule->{errors} || {};
1568
1569     my $error_count = 0;
1570
1571     my $add_error = sub {
1572         my ($param, $msg)  = @_;
1573         chomp $msg;
1574         raise_param_exc({ $param => $msg }) if !$noerr;
1575         $error_count++;
1576         $errors->{$param} = $msg if !$errors->{$param};
1577     };
1578
1579     my $ipversion;
1580     my $set_ip_version = sub {
1581         my $vers = shift;
1582         if ($vers) {
1583             die "detected mixed ipv4/ipv6 adresses in rule\n"
1584                 if $ipversion && ($vers != $ipversion);
1585             $ipversion = $vers;
1586         }
1587     };
1588
1589     my $check_ipset_or_alias_property = sub {
1590         my ($name, $expected_ipversion) = @_;
1591
1592         if (my $value = $rule->{$name}) {
1593             if ($value =~ m/^\+/) {
1594                 if ($value =~ m/^\+(${ipset_name_pattern})$/) {
1595                     &$add_error($name, "no such ipset '$1'")
1596                         if !($cluster_conf->{ipset}->{$1} || ($fw_conf && $fw_conf->{ipset}->{$1}));
1597
1598                 } else {
1599                     &$add_error($name, "invalid ipset name '$value'");
1600                 }
1601             } elsif ($value =~ m/^${ip_alias_pattern}$/){
1602                 my $alias = lc($value);
1603                 &$add_error($name, "no such alias '$value'")
1604                     if !($cluster_conf->{aliases}->{$alias} || ($fw_conf && $fw_conf->{aliases}->{$alias}));
1605                 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1606                 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1607
1608                 &$set_ip_version($e->{ipversion});
1609             }
1610         }
1611     };
1612
1613     my $type = $rule->{type};
1614     my $action = $rule->{action};
1615
1616     &$add_error('type', "missing property") if !$type;
1617     &$add_error('action', "missing property") if !$action;
1618
1619     if ($type) {
1620         if ($type eq  'in' || $type eq 'out') {
1621             &$add_error('action', "unknown action '$action'")
1622                 if $action && ($action !~ m/^(ACCEPT|DROP|REJECT)$/);
1623         } elsif ($type eq 'group') {
1624             &$add_error('type', "security groups not allowed")
1625                 if !$allow_groups;
1626             &$add_error('action', "invalid characters in security group name")
1627                 if $action && ($action !~ m/^${security_group_name_pattern}$/);
1628             &$add_error('action', "security group '$action' does not exist")
1629                 if $action && !defined($cluster_conf->{groups}->{$action});
1630         } else {
1631             &$add_error('type', "unknown rule type '$type'");
1632         }
1633     }
1634
1635     if ($rule->{iface}) {
1636         &$add_error('type', "parameter -i not allowed for this rule type")
1637             if !$allow_iface;
1638         eval { PVE::JSONSchema::pve_verify_iface($rule->{iface}); };
1639         &$add_error('iface', $@) if $@;
1640         if ($rule_env eq 'vm' || $rule_env eq 'ct') {
1641             &$add_error('iface', "value does not match the regex pattern 'net\\d+'")
1642                 if $rule->{iface} !~  m/^net(\d+)$/;
1643         }
1644     }
1645
1646     if ($rule->{macro}) {
1647         if (my $preferred_name = $pve_fw_preferred_macro_names->{lc($rule->{macro})}) {
1648             $rule->{macro} = $preferred_name;
1649         } else {
1650             &$add_error('macro', "unknown macro '$rule->{macro}'");
1651         }
1652     }
1653
1654     if ($rule->{proto}) {
1655         eval { pve_fw_verify_protocol_spec($rule->{proto}); };
1656         &$add_error('proto', $@) if $@;
1657         &$set_ip_version(4) if $rule->{proto} eq 'icmp';
1658         &$set_ip_version(6) if $rule->{proto} eq 'icmpv6';
1659     }
1660
1661     if ($rule->{dport}) {
1662         eval { parse_port_name_number_or_range($rule->{dport}, 1); };
1663         &$add_error('dport', $@) if $@;
1664         my $proto = $rule->{proto};
1665         &$add_error('proto', "missing property - 'dport' requires this property")
1666             if !$proto;
1667         &$add_error('dport', "protocol '$proto' does not support ports")
1668             if !$PROTOCOLS_WITH_PORTS->{$proto} &&
1669                 $proto ne 'icmp' && $proto ne 'icmpv6'; # special cases
1670     }
1671
1672     if ($rule->{sport}) {
1673         eval { parse_port_name_number_or_range($rule->{sport}, 0); };
1674         &$add_error('sport', $@) if $@;
1675         my $proto = $rule->{proto};
1676         &$add_error('proto', "missing property - 'sport' requires this property")
1677             if !$proto;
1678         &$add_error('sport', "protocol '$proto' does not support ports")
1679             if !$PROTOCOLS_WITH_PORTS->{$proto};
1680     }
1681
1682     if ($rule->{source}) {
1683         eval {
1684             my $source_ipversion = parse_address_list($rule->{source});
1685             &$set_ip_version($source_ipversion);
1686         };
1687         &$add_error('source', $@) if $@;
1688         &$check_ipset_or_alias_property('source', $ipversion);
1689     }
1690
1691     if ($rule->{dest}) {
1692         eval {
1693             my $dest_ipversion = parse_address_list($rule->{dest});
1694             &$set_ip_version($dest_ipversion);
1695         };
1696         &$add_error('dest', $@) if $@;
1697         &$check_ipset_or_alias_property('dest', $ipversion);
1698     }
1699
1700     $rule->{ipversion} = $ipversion if $ipversion;
1701
1702     if ($rule->{macro} && !$error_count) {
1703         eval { &$apply_macro($rule->{macro}, $rule, 1, $ipversion); };
1704         if (my $err = $@) {
1705             if (ref($err) eq "PVE::Exception" && $err->{errors}) {
1706                 my $eh = $err->{errors};
1707                 foreach my $p (keys %$eh) {
1708                     &$add_error($p, $eh->{$p});
1709                 }
1710             } else {
1711                 &$add_error('macro', "$err");
1712             }
1713         }
1714     }
1715
1716     $rule->{errors} = $errors if $error_count;
1717
1718     return $rule;
1719 }
1720
1721 sub copy_rule_data {
1722     my ($rule, $param) = @_;
1723
1724     foreach my $k (keys %$rule_properties) {
1725         if (defined(my $v = $param->{$k})) {
1726             if ($v eq '' || $v eq '-') {
1727                 delete $rule->{$k};
1728             } else {
1729                 $rule->{$k} = $v;
1730             }
1731         }
1732     }
1733
1734     return $rule;
1735 }
1736
1737 sub rules_modify_permissions {
1738     my ($rule_env) = @_;
1739
1740     if ($rule_env eq 'host') {
1741         return {
1742             check => ['perm', '/nodes/{node}', [ 'Sys.Modify' ]],
1743         };
1744     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1745         return {
1746             check => ['perm', '/', [ 'Sys.Modify' ]],
1747         };
1748     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1749         return {
1750             check => ['perm', '/vms/{vmid}', [ 'VM.Config.Network' ]],
1751         }
1752     }
1753
1754     return undef;
1755 }
1756
1757 sub rules_audit_permissions {
1758     my ($rule_env) = @_;
1759
1760     if ($rule_env eq 'host') {
1761         return {
1762             check => ['perm', '/nodes/{node}', [ 'Sys.Audit' ]],
1763         };
1764     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1765         return {
1766             check => ['perm', '/', [ 'Sys.Audit' ]],
1767         };
1768     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1769         return {
1770             check => ['perm', '/vms/{vmid}', [ 'VM.Audit' ]],
1771         }
1772     }
1773
1774     return undef;
1775 }
1776
1777 # core functions
1778 my $bridge_firewall_enabled = 0;
1779
1780 sub enable_bridge_firewall {
1781
1782     return if $bridge_firewall_enabled; # only once
1783
1784     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
1785     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
1786
1787     # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
1788     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
1789
1790     $bridge_firewall_enabled = 1;
1791 }
1792
1793 sub iptables_restore_cmdlist {
1794     my ($cmdlist, $table) = @_;
1795
1796     $table = 'filter' if !$table;
1797     run_command(['iptables-restore', '-T', $table, '-n'], input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1798 }
1799
1800 sub ip6tables_restore_cmdlist {
1801     my ($cmdlist, $table) = @_;
1802
1803     $table = 'filter' if !$table;
1804     run_command(['ip6tables-restore', '-T', $table, '-n'], input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1805 }
1806
1807 sub ipset_restore_cmdlist {
1808     my ($cmdlist) = @_;
1809
1810     run_command(['ipset', 'restore'], input => $cmdlist, errmsg => "ipset_restore_cmdlist");
1811 }
1812
1813 sub ebtables_restore_cmdlist {
1814     my ($cmdlist) = @_;
1815
1816     run_command(['ebtables-restore'], input => $cmdlist, errmsg => "ebtables_restore_cmdlist");
1817 }
1818
1819 sub iptables_get_chains {
1820     my ($iptablescmd, $t) = @_;
1821
1822     $iptablescmd = "iptables" if !$iptablescmd;
1823     $t = 'filter' if !$t;
1824
1825     my $res = {};
1826
1827     # check what chains we want to track
1828     my $is_pvefw_chain = sub {
1829         my $name = shift;
1830
1831         return 1 if $name =~ m/^PVEFW-\S+$/;
1832
1833         return 1 if $name =~ m/^tap\d+i\d+-(?:IN|OUT)$/;
1834
1835         return 1 if $name =~ m/^veth\d+i\d+-(?:IN|OUT)$/;
1836
1837         return 1 if $name =~ m/^fwbr\d+(v\d+)?-(?:FW|IN|OUT|IPS)$/;
1838         return 1 if $name =~ m/^GROUP-(?:$security_group_name_pattern)-(?:IN|OUT)$/;
1839
1840         return undef;
1841     };
1842
1843     my $table = '';
1844
1845     my $hooks = {};
1846
1847     my $parser = sub {
1848         my $line = shift;
1849
1850         return if $line =~ m/^#/;
1851         return if $line =~ m/^\s*$/;
1852
1853         if ($line =~ m/^\*(\S+)$/) {
1854             $table = $1;
1855             return;
1856         }
1857
1858         return if $table ne $t;
1859
1860         if ($line =~ m/^:(\S+)\s/) {
1861             my $chain = $1;
1862             return if !&$is_pvefw_chain($chain);
1863             $res->{$chain} = "unknown";
1864         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
1865             my ($chain, $sig) = ($1, $2);
1866             return if !&$is_pvefw_chain($chain);
1867             $res->{$chain} = $sig;
1868         } elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD|PREROUTING)\s+-j\s+PVEFW-\1$/) {
1869             $hooks->{$1} = 1;
1870         } else {
1871             # simply ignore the rest
1872             return;
1873         }
1874     };
1875
1876     run_command(["$iptablescmd-save"], outfunc => $parser);
1877
1878     return wantarray ? ($res, $hooks) : $res;
1879 }
1880
1881 sub iptables_chain_digest {
1882     my ($rules) = @_;
1883     my $digest = Digest::SHA->new('sha1');
1884     foreach my $rule (@$rules) { # order is important
1885         $digest->add($rule);
1886     }
1887     return $digest->b64digest;
1888 }
1889
1890 sub ipset_chain_digest {
1891     my ($rules) = @_;
1892
1893     my $digest = Digest::SHA->new('sha1');
1894     foreach my $rule (sort @$rules) { # note: sorted
1895         $digest->add($rule);
1896     }
1897     return $digest->b64digest;
1898 }
1899
1900 sub ipset_get_chains {
1901
1902     my $res = {};
1903     my $chains = {};
1904
1905     my $parser = sub {
1906         my $line = shift;
1907
1908         return if $line =~ m/^#/;
1909         return if $line =~ m/^\s*$/;
1910         if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
1911             my $chain = $1;
1912             $line =~ s/\s+$//; # delete trailing white space
1913             push @{$chains->{$chain}}, $line;
1914         } else {
1915             # simply ignore the rest
1916             return;
1917         }
1918     };
1919
1920     run_command(['ipset', 'save'], outfunc => $parser);
1921
1922     # compute digest for each chain
1923     foreach my $chain (keys %$chains) {
1924         $res->{$chain} = ipset_chain_digest($chains->{$chain});
1925     }
1926
1927     return $res;
1928 }
1929
1930 sub ebtables_get_chains {
1931
1932     my $res = {};
1933     my $chains = {};
1934     my $parser = sub {
1935         my $line = shift;
1936         return if $line =~ m/^#/;
1937         return if $line =~ m/^\s*$/;
1938         if ($line =~ m/^:(\S+)\s\S+$/) {
1939             # Make sure we know chains exist even if they're empty.
1940             $chains->{$1} //= [];
1941         } elsif ($line =~ m/^(?:\S+)\s(\S+)\s(?:\S+).*/) {
1942             my $chain = $1;
1943             $line =~ s/\s+$//;
1944             push @{$chains->{$chain}}, $line;
1945         } else {
1946             # simply ignore the rest
1947             return;
1948         }
1949     };
1950
1951     run_command(['ebtables-save'], outfunc => $parser);
1952     # compute digest for each chain and store rules as well
1953     foreach my $chain (keys %$chains) {
1954         $res->{$chain}->{rules} = $chains->{$chain};
1955         $res->{$chain}->{sig} = iptables_chain_digest($chains->{$chain});
1956     }
1957     return $res;
1958 }
1959
1960 # substitude action of rule according to action hash
1961 sub rule_substitude_action {
1962     my ($rule, $actions) = @_;
1963
1964     if (my $action = $rule->{action}) {
1965         $rule->{action} = $actions->{$action} if defined($actions->{$action});
1966     }
1967 }
1968
1969 # generate a src or dst match
1970 # $dir(ection) is either d or s
1971 sub ipt_gen_src_or_dst_match {
1972     my ($adr, $dir, $ipversion, $cluster_conf, $fw_conf) = @_;
1973
1974     my $srcdst;
1975     if ($dir eq 's') {
1976         $srcdst = "src";
1977     } elsif ($dir eq 'd') {
1978         $srcdst = "dst";
1979     } else {
1980         die "ipt_gen_src_or_dst_match: invalid direction $dir \n";
1981     }
1982
1983     my $match;
1984     if ($adr =~ m/^\+/) {
1985         if ($adr =~ m/^\+(${ipset_name_pattern})$/) {
1986             my $name = $1;
1987             my $ipset_chain;
1988             if ($fw_conf && $fw_conf->{ipset}->{$name}) {
1989                 $ipset_chain = compute_ipset_chain_name($fw_conf->{vmid}, $name, $ipversion);
1990             } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
1991                 $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
1992             } else {
1993                 die "no such ipset '$name'\n";
1994             }
1995             $match = "-m set --match-set ${ipset_chain} ${srcdst}";
1996         } else {
1997             die "invalid security group name '$adr'\n";
1998         }
1999     } elsif ($adr =~ m/^${ip_alias_pattern}$/){
2000         my $alias = lc($adr);
2001         my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2002         $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
2003         die "no such alias '$adr'\n" if !$e;
2004         $match = "-${dir} $e->{cidr}";
2005     } elsif ($adr =~ m/\-/){
2006         $match = "-m iprange --${srcdst}-range $adr";
2007     } else {
2008         $match = "-${dir} $adr";
2009     }
2010
2011     return $match;
2012 }
2013
2014 # convert a %rule to an array of iptables commands
2015 sub ipt_rule_to_cmds {
2016     my ($rule, $chain, $ipversion, $cluster_conf, $fw_conf, $vmid) = @_;
2017
2018     die "ipt_rule_to_cmds unable to handle macro" if $rule->{macro}; #should not happen
2019
2020     my @match = ();
2021
2022     if (defined $rule->{match}) {
2023         push @match, $rule->{match};
2024     } else {
2025         push @match, "-i $rule->{iface_in}" if $rule->{iface_in};
2026         push @match, "-o $rule->{iface_out}" if $rule->{iface_out};
2027
2028         if ($rule->{source}) {
2029             push @match, ipt_gen_src_or_dst_match($rule->{source}, 's', $ipversion, $cluster_conf, $fw_conf);
2030         }
2031         if ($rule->{dest}) {
2032             push @match, ipt_gen_src_or_dst_match($rule->{dest}, 'd', $ipversion, $cluster_conf, $fw_conf);
2033         }
2034
2035         if (my $proto = $rule->{proto}) {
2036             push @match, "-p $proto";
2037
2038             my $multidport = defined($rule->{dport}) && parse_port_name_number_or_range($rule->{dport}, 1);
2039             my $multisport = defined($rule->{sport}) && parse_port_name_number_or_range($rule->{sport}, 0);
2040
2041             my $add_dport = sub {
2042                 return if !$rule->{dport};
2043
2044                 if ($proto eq 'icmp') {
2045                     # Note: we use dport to store --icmp-type
2046                     die "unknown icmp-type '$rule->{dport}'\n"
2047                         if $rule->{dport} !~ /^\d+$/ && !defined($icmp_type_names->{$rule->{dport}});
2048                     # values for icmp-type range between 0 and 255
2049                     # higher values and iptables-restore fails
2050                     die "invalid icmp-type '$rule->{dport}'\n" if ($rule->{dport} =~ m/^(\d+)$/) && ($1 > 255);
2051                     push @match, "-m icmp --icmp-type $rule->{dport}";
2052                 } elsif ($proto eq 'icmpv6') {
2053                     # Note: we use dport to store --icmpv6-type
2054                     die "unknown icmpv6-type '$rule->{dport}'\n"
2055                         if $rule->{dport} !~ /^\d+$/ && !defined($icmpv6_type_names->{$rule->{dport}});
2056                     # values for icmpv6-type range between 0 and 255
2057                     # higher values and iptables-restore fails
2058                     die "invalid icmpv6-type '$rule->{dport}'\n" if ($rule->{dport} =~ m/^(\d+)$/) && ($1 > 255);
2059                     push @match, "-m icmpv6 --icmpv6-type $rule->{dport}";
2060                 } elsif (!$PROTOCOLS_WITH_PORTS->{$proto}) {
2061                     die "protocol $proto does not have ports\n";
2062                 } elsif ($multidport) {
2063                     push @match, "--match multiport", "--dports $rule->{dport}";
2064                 } else {
2065                     push @match, "--dport $rule->{dport}";
2066                 }
2067             };
2068
2069             my $add_sport = sub {
2070                 return if !$rule->{sport};
2071
2072                 die "protocol $proto does not have ports\n"
2073                     if !$PROTOCOLS_WITH_PORTS->{$proto};
2074                 if ($multisport) {
2075                     push @match, "--match multiport", "--sports $rule->{sport}";
2076                 } else {
2077                     push @match, "--sport $rule->{sport}";
2078                 }
2079             };
2080
2081             # order matters - single port before multiport!
2082             $add_dport->() if $multisport;
2083             $add_sport->();
2084             $add_dport->() if !$multisport;
2085         } elsif ($rule->{dport} || $rule->{sport}) {
2086             die "destination port '$rule->{dport}', but no protocol specified\n" if $rule->{dport};
2087             die "source port '$rule->{sport}', but no protocol specified\n" if $rule->{sport};
2088         }
2089
2090         push @match, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
2091     }
2092     my $matchstr = scalar(@match) ? join(' ', @match) : "";
2093
2094     my $targetstr;
2095     if (defined $rule->{target}) {
2096         $targetstr = $rule->{target};
2097     } else {
2098         my $action = (defined $rule->{action}) ? $rule->{action} : "";
2099         my $goto = 1 if $action eq 'PVEFW-SET-ACCEPT-MARK';
2100         $targetstr = ($goto) ? "-g $action" : "-j $action";
2101     }
2102
2103     my @iptcmds;
2104     my $log = $rule->{log};
2105     if (defined($log) && $log ne 'nolog') {
2106         my $loglevel = $log_level_hash->{$log};
2107         my $logaction = get_log_rule_base($chain, $vmid, $rule->{logmsg}, $loglevel);
2108         push @iptcmds, "-A $chain $matchstr $logaction";
2109     }
2110     push @iptcmds, "-A $chain $matchstr $targetstr";
2111     return @iptcmds;
2112 }
2113
2114 sub ruleset_generate_rule {
2115     my ($ruleset, $chain, $ipversion, $rule, $cluster_conf, $fw_conf, $vmid) = @_;
2116
2117     my $rules;
2118
2119     if ($rule->{macro}) {
2120         $rules = &$apply_macro($rule->{macro}, $rule, 0, $ipversion);
2121     } else {
2122         $rules = [ $rule ];
2123     }
2124
2125     # update all or nothing
2126     my @ipt_rule_cmds;
2127     foreach my $r (@$rules) {
2128         push @ipt_rule_cmds, ipt_rule_to_cmds($r, $chain, $ipversion, $cluster_conf, $fw_conf, $vmid);
2129     }
2130     foreach my $c (@ipt_rule_cmds) {
2131         ruleset_add_ipt_cmd($ruleset, $chain, $c);
2132     }
2133 }
2134
2135 sub ruleset_create_chain {
2136     my ($ruleset, $chain) = @_;
2137
2138     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
2139     die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
2140
2141     die "chain '$chain' already exists\n" if $ruleset->{$chain};
2142
2143     $ruleset->{$chain} = [];
2144 }
2145
2146 sub ruleset_chain_exist {
2147     my ($ruleset, $chain) = @_;
2148
2149     return $ruleset->{$chain} ? 1 : undef;
2150 }
2151
2152 # add an iptables command (like generated by ipt_rule_to_cmds) to a chain
2153 sub ruleset_add_ipt_cmd {
2154    my ($ruleset, $chain, $iptcmd) = @_;
2155
2156    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2157
2158    push @{$ruleset->{$chain}}, $iptcmd;
2159 }
2160
2161 sub ruleset_addrule {
2162     my ($ruleset, $chain, $match, $action, $log, $logmsg, $vmid) = @_;
2163
2164     die "no such chain '$chain'\n" if !$ruleset->{$chain};
2165
2166     if ($log) {
2167         my $loglevel = $log_level_hash->{$log};
2168         my $logaction = get_log_rule_base($chain, $vmid, $logmsg, $loglevel);
2169         push @{$ruleset->{$chain}}, "-A $chain $match $logaction";
2170     }
2171     # for stable ebtables digests avoid double-spaces to match ebtables-save output
2172     $match .= ' ' if length($match);
2173     push @{$ruleset->{$chain}}, "-A $chain ${match}$action";
2174 }
2175
2176 sub ruleset_insertrule {
2177    my ($ruleset, $chain, $match, $action, $log) = @_;
2178
2179    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2180
2181    unshift @{$ruleset->{$chain}}, "-A $chain $match $action";
2182 }
2183
2184 sub get_log_rule_base {
2185     my ($chain, $vmid, $msg, $loglevel) = @_;
2186
2187     $vmid = 0 if !defined($vmid);
2188     $msg = "" if !defined($msg);
2189
2190     my $rlimit = '';
2191     if (defined($global_log_ratelimit)) {
2192         $rlimit = "-m limit $global_log_ratelimit ";
2193     }
2194
2195     # Note: we use special format for prefix to pass further
2196     # info to log daemon (VMID, LOGLEVEL and CHAIN)
2197     return "${rlimit}-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
2198 }
2199
2200 sub ruleset_add_chain_policy {
2201     my ($ruleset, $chain, $ipversion, $vmid, $policy, $loglevel, $accept_action) = @_;
2202
2203     if ($policy eq 'ACCEPT') {
2204
2205         my $rule = { action => 'ACCEPT' };
2206         rule_substitude_action($rule, { ACCEPT =>  $accept_action});
2207         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule);
2208
2209     } elsif ($policy eq 'DROP') {
2210
2211         ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Drop");
2212
2213         ruleset_addrule($ruleset, $chain, "", "-j DROP", $loglevel, "policy $policy: ", $vmid);
2214     } elsif ($policy eq 'REJECT') {
2215         ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Reject");
2216
2217         ruleset_addrule($ruleset, $chain, "", "-g PVEFW-reject", $loglevel, "policy $policy: ", $vmid);
2218     } else {
2219         # should not happen
2220         die "internal error: unknown policy '$policy'";
2221     }
2222 }
2223
2224 sub ruleset_chain_add_ndp {
2225     my ($ruleset, $chain, $ipversion, $options, $direction, $accept) = @_;
2226     return if $ipversion != 6 || (defined($options->{ndp}) && !$options->{ndp});
2227
2228     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-solicitation", $accept);
2229     if ($direction ne 'OUT' || $options->{radv}) {
2230         ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", $accept);
2231     }
2232     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-solicitation", $accept);
2233     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-advertisement", $accept);
2234 }
2235
2236 sub ruleset_chain_add_conn_filters {
2237     my ($ruleset, $chain, $allow_invalid, $accept) = @_;
2238
2239     if (!$allow_invalid) {
2240         ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID", "-j DROP");
2241     }
2242     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED", "-j $accept");
2243 }
2244
2245 sub ruleset_chain_add_input_filters {
2246     my ($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel) = @_;
2247
2248     if ($cluster_conf->{ipset}->{blacklist}){
2249         if (!ruleset_chain_exist($ruleset, "PVEFW-blacklist")) {
2250             ruleset_create_chain($ruleset, "PVEFW-blacklist");
2251             ruleset_addrule($ruleset, "PVEFW-blacklist", "", "-j DROP", $loglevel, "DROP: ", 0);
2252         }
2253         my $ipset_chain = compute_ipset_chain_name(0, 'blacklist', $ipversion);
2254         ruleset_addrule($ruleset, $chain, "-m set --match-set ${ipset_chain} src", "-j PVEFW-blacklist");
2255     }
2256
2257     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
2258         if ($ipversion == 4) {
2259             ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW", "-j PVEFW-smurfs");
2260         }
2261     }
2262
2263     if ($options->{tcpflags}) {
2264         ruleset_addrule($ruleset, $chain, "-p tcp", "-j PVEFW-tcpflags");
2265     }
2266 }
2267
2268 sub ruleset_create_vm_chain {
2269     my ($ruleset, $chain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction) = @_;
2270
2271     ruleset_create_chain($ruleset, $chain);
2272     my $accept = generate_nfqueue($options);
2273
2274     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
2275         if ($ipversion == 4) {
2276             if ($direction eq 'OUT') {
2277                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2278                                       { action => 'PVEFW-SET-ACCEPT-MARK',
2279                                         proto => 'udp', sport => 68, dport => 67 });
2280             } else {
2281                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2282                                       { action => 'ACCEPT',
2283                                         proto => 'udp', sport => 67, dport => 68 });
2284             }
2285         } elsif ($ipversion == 6) {
2286             if ($direction eq 'OUT') {
2287                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2288                                       { action => 'PVEFW-SET-ACCEPT-MARK',
2289                                         proto => 'udp', sport => 546, dport => 547 });
2290             } else {
2291                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2292                                       { action => 'ACCEPT',
2293                                         proto => 'udp', sport => 547, dport => 546 });
2294             }
2295         }
2296
2297     }
2298
2299     if ($direction eq 'OUT') {
2300         if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
2301             ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr", "-j DROP");
2302         }
2303         if ($ipversion == 6 && !$options->{radv}) {
2304             ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", "-j DROP");
2305         }
2306         if ($ipfilter_ipset) {
2307             ruleset_addrule($ruleset, $chain, "-m set ! --match-set $ipfilter_ipset src", "-j DROP");
2308         }
2309         ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2310     }
2311
2312     my $accept_action = $direction eq 'OUT' ? '-g PVEFW-SET-ACCEPT-MARK' : "-j $accept";
2313     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, $direction, $accept_action);
2314 }
2315
2316 sub ruleset_add_group_rule {
2317     my ($ruleset, $cluster_conf, $chain, $rule, $direction, $action, $ipversion) = @_;
2318
2319     my $group = $rule->{action};
2320     my $group_chain = "GROUP-$group-$direction";
2321     if(!ruleset_chain_exist($ruleset, $group_chain)){
2322         generate_group_rules($ruleset, $cluster_conf, $group, $ipversion);
2323     }
2324
2325     if ($direction eq 'OUT' && $rule->{iface_out}) {
2326         ruleset_addrule($ruleset, $chain, "-o $rule->{iface_out}", "-j $group_chain");
2327     } elsif ($direction eq 'IN' && $rule->{iface_in}) {
2328         ruleset_addrule($ruleset, $chain, "-i $rule->{iface_in}", "-j $group_chain");
2329     } else {
2330         ruleset_addrule($ruleset, $chain, "", "-j $group_chain");
2331     }
2332
2333     ruleset_addrule($ruleset, $chain, "-m mark --mark $FWACCEPTMARK_ON", "-j $action");
2334 }
2335
2336 sub ruleset_generate_vm_rules {
2337     my ($ruleset, $rules, $cluster_conf, $vmfw_conf, $chain, $netid, $direction, $options, $ipversion, $vmid) = @_;
2338
2339     my $lc_direction = lc($direction);
2340
2341     my $in_accept = generate_nfqueue($options);
2342
2343     foreach my $rule (@$rules) {
2344         next if $rule->{iface} && $rule->{iface} ne $netid;
2345         next if !$rule->{enable} || $rule->{errors};
2346         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2347
2348         if ($rule->{type} eq 'group') {
2349             ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, $direction,
2350                                    $direction eq 'OUT' ? 'RETURN' : $in_accept, $ipversion);
2351         } else {
2352             next if $rule->{type} ne $lc_direction;
2353             eval {
2354                 $rule->{logmsg} = "$rule->{action}: ";
2355                 if ($direction eq 'OUT') {
2356                     rule_substitude_action($rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
2357                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $vmfw_conf, $vmid);
2358                 } else {
2359                     rule_substitude_action($rule, { ACCEPT => $in_accept , REJECT => "PVEFW-reject" });
2360                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $vmfw_conf, $vmid);
2361                 }
2362             };
2363             warn $@ if $@;
2364         }
2365     }
2366 }
2367
2368 sub generate_nfqueue {
2369     my ($options) = @_;
2370
2371     if ($options->{ips}) {
2372         my $action = "NFQUEUE";
2373         if ($options->{ips_queues} && $options->{ips_queues} =~ m/^(\d+)(:(\d+))?$/) {
2374             if (defined($3) && defined($1)) {
2375                 $action .= " --queue-balance $1:$3";
2376             } elsif (defined($1)) {
2377                 $action .= " --queue-num $1";
2378             }
2379         }
2380         $action .= " --queue-bypass" if $feature_ipset_nomatch; #need kernel 3.10
2381         return $action;
2382     } else {
2383         return "ACCEPT";
2384     }
2385 }
2386
2387 sub ruleset_generate_vm_ipsrules {
2388     my ($ruleset, $options, $direction, $iface) = @_;
2389
2390     if ($options->{ips} && $direction eq 'IN') {
2391         my $nfqueue = generate_nfqueue($options);
2392
2393         if (!ruleset_chain_exist($ruleset, "PVEFW-IPS")) {
2394             ruleset_create_chain($ruleset, "PVEFW-IPS");
2395         }
2396
2397         ruleset_addrule($ruleset, "PVEFW-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged", "-j $nfqueue");
2398     }
2399 }
2400
2401 sub generate_tap_rules_direction {
2402     my ($ruleset, $cluster_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $direction, $ipversion) = @_;
2403
2404     my $lc_direction = lc($direction);
2405
2406     my $rules = $vmfw_conf->{rules};
2407
2408     my $options = $vmfw_conf->{options};
2409     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
2410
2411     my $tapchain = "$iface-$direction";
2412
2413     my $ipfilter_name = compute_ipfilter_ipset_name($netid);
2414     my $ipfilter_ipset = compute_ipset_chain_name($vmid, $ipfilter_name, $ipversion)
2415         if $options->{ipfilter} || $vmfw_conf->{ipset}->{$ipfilter_name};
2416
2417     if ($options->{enable}) {
2418         # create chain with mac and ip filter
2419         ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
2420
2421         ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $tapchain, $netid, $direction, $options, $ipversion, $vmid);
2422
2423         ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface);
2424
2425         # implement policy
2426         my $policy;
2427
2428         if ($direction eq 'OUT') {
2429             $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
2430         } else {
2431             $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
2432         }
2433
2434         my $accept = generate_nfqueue($options);
2435         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
2436         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, $policy, $loglevel, $accept_action);
2437     } else {
2438         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : 'ACCEPT';
2439         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, 'ACCEPT', $loglevel, $accept_action);
2440     }
2441
2442     # plug the tap chain to bridge chain
2443     if ($direction eq 'IN') {
2444         ruleset_addrule($ruleset, "PVEFW-FWBR-IN",
2445                         "-m physdev --physdev-is-bridged --physdev-out $iface", "-j $tapchain");
2446     } else {
2447         ruleset_addrule($ruleset, "PVEFW-FWBR-OUT",
2448                         "-m physdev --physdev-is-bridged --physdev-in $iface", "-j $tapchain");
2449     }
2450 }
2451
2452 sub enable_host_firewall {
2453     my ($ruleset, $hostfw_conf, $cluster_conf, $ipversion, $corosync_conf) = @_;
2454
2455     my $options = $hostfw_conf->{options};
2456     my $cluster_options = $cluster_conf->{options};
2457     my $rules = $hostfw_conf->{rules};
2458     my $cluster_rules = $cluster_conf->{rules};
2459
2460     # corosync preparation
2461     my $corosync_rule = "-p udp --dport 5404:5405";
2462     my $corosync_local_addresses = {};
2463     my $multicast_enabled;
2464     my $local_hostname = PVE::INotify::nodename();
2465     if (defined($corosync_conf)) {
2466         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2467             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2468
2469             if ($node_name eq $local_hostname) {
2470                 $corosync_local_addresses->{$key} = $node_ip;
2471             }
2472         });
2473
2474         # allow multicast only if enabled in config
2475         my $corosync_transport = $corosync_conf->{main}->{totem}->{transport};
2476         $multicast_enabled = defined($corosync_transport) && $corosync_transport eq 'udp';
2477     }
2478
2479     # host inbound firewall
2480     my $chain = "PVEFW-HOST-IN";
2481     ruleset_create_chain($ruleset, $chain);
2482
2483     my $loglevel = get_option_log_level($options, "log_level_in");
2484
2485     ruleset_addrule($ruleset, $chain, "-i lo", "-j ACCEPT");
2486
2487     ruleset_chain_add_conn_filters($ruleset, $chain, 0, 'ACCEPT');
2488     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'IN', '-j RETURN');
2489     ruleset_chain_add_input_filters($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel);
2490
2491     # we use RETURN because we need to check also tap rules
2492     my $accept_action = 'RETURN';
2493
2494     ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
2495
2496     # add host rules first, so that cluster wide rules can be overwritten
2497     foreach my $rule (@$rules, @$cluster_rules) {
2498         next if !$rule->{enable} || $rule->{errors};
2499         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2500
2501         $rule->{iface_in} = $rule->{iface} if $rule->{iface};
2502
2503         eval {
2504             $rule->{logmsg} = "$rule->{action}: ";
2505             if ($rule->{type} eq 'group') {
2506                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'IN', $accept_action, $ipversion);
2507             } elsif ($rule->{type} eq 'in') {
2508                 rule_substitude_action($rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
2509                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $hostfw_conf, 0);
2510             }
2511         };
2512         warn $@ if $@;
2513         delete $rule->{iface_in};
2514     }
2515
2516     # allow standard traffic for management ipset (includes cluster network)
2517     my $mngmnt_ipset_chain = compute_ipset_chain_name(0, "management", $ipversion);
2518     my $mngmntsrc = "-m set --match-set ${mngmnt_ipset_chain} src";
2519     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 8006", "-j $accept_action");  # PVE API
2520     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
2521     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
2522     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 22", "-j $accept_action");  # SSH
2523     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 60000:60050", "-j $accept_action");  # Migration
2524
2525     # corosync inbound rules
2526     if (defined($corosync_conf)) {
2527         ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action")
2528             if $multicast_enabled;
2529
2530         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2531             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2532             my $destination = $corosync_local_addresses->{$key};
2533
2534             if ($node_name ne $local_hostname && defined($destination)) {
2535                 # accept only traffic on same ring
2536                 ruleset_addrule($ruleset, $chain, "-d $destination -s $node_ip $corosync_rule", "-j $accept_action");
2537             }
2538         });
2539     }
2540
2541     # implement input policy
2542     my $policy = $cluster_options->{policy_in} || 'DROP'; # allow nothing by default
2543     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2544
2545     # host outbound firewall
2546     $chain = "PVEFW-HOST-OUT";
2547     ruleset_create_chain($ruleset, $chain);
2548
2549     $loglevel = get_option_log_level($options, "log_level_out");
2550
2551     ruleset_addrule($ruleset, $chain, "-o lo", "-j ACCEPT");
2552
2553     ruleset_chain_add_conn_filters($ruleset, $chain, 0, 'ACCEPT');
2554
2555     # we use RETURN because we may want to check other thigs later
2556     $accept_action = 'RETURN';
2557     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'OUT', "-j $accept_action");
2558
2559     ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
2560
2561     # add host rules first, so that cluster wide rules can be overwritten
2562     foreach my $rule (@$rules, @$cluster_rules) {
2563         next if !$rule->{enable} || $rule->{errors};
2564         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2565
2566         $rule->{iface_out} = $rule->{iface} if $rule->{iface};
2567         eval {
2568             $rule->{logmsg} = "$rule->{action}: ";
2569             if ($rule->{type} eq 'group') {
2570                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'OUT', $accept_action, $ipversion);
2571             } elsif ($rule->{type} eq 'out') {
2572                 rule_substitude_action($rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
2573                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $hostfw_conf, 0);
2574             }
2575         };
2576         warn $@ if $@;
2577         delete $rule->{iface_out};
2578     }
2579
2580     # allow standard traffic on cluster network
2581     my $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
2582     my $localnet_ver = $cluster_conf->{aliases}->{local_network}->{ipversion};
2583
2584     if ($localnet && ($ipversion == $localnet_ver)) {
2585         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 8006", "-j $accept_action");  # PVE API
2586         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 22", "-j $accept_action");  # SSH
2587         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
2588         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
2589     }
2590
2591     # corosync outbound rules
2592     if (defined($corosync_conf)) {
2593         ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action")
2594             if $multicast_enabled;
2595
2596         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2597             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2598             my $source = $corosync_local_addresses->{$key};
2599
2600             if ($node_name ne $local_hostname && defined($source)) {
2601                 # accept only traffic on same ring
2602                 ruleset_addrule($ruleset, $chain, "-s $source -d $node_ip $corosync_rule", "-j $accept_action");
2603             }
2604         });
2605     }
2606
2607     # implement output policy
2608     $policy = $cluster_options->{policy_out} || 'ACCEPT'; # allow everything by default
2609     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2610
2611     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "", "-j PVEFW-HOST-OUT");
2612     ruleset_addrule($ruleset, "PVEFW-INPUT", "", "-j PVEFW-HOST-IN");
2613 }
2614
2615 sub generate_group_rules {
2616     my ($ruleset, $cluster_conf, $group, $ipversion) = @_;
2617
2618     my $rules = $cluster_conf->{groups}->{$group};
2619
2620     if (!$rules) {
2621         warn "no such security group '$group'\n";
2622         $rules = []; # create empty chain
2623     }
2624
2625     my $chain = "GROUP-${group}-IN";
2626
2627     ruleset_create_chain($ruleset, $chain);
2628     ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2629
2630     foreach my $rule (@$rules) {
2631         next if $rule->{type} ne 'in';
2632         next if !$rule->{enable} || $rule->{errors};
2633         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2634         rule_substitude_action($rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
2635         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf);
2636     }
2637
2638     $chain = "GROUP-${group}-OUT";
2639
2640     ruleset_create_chain($ruleset, $chain);
2641     ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2642
2643     foreach my $rule (@$rules) {
2644         next if $rule->{type} ne 'out';
2645         next if !$rule->{enable} || $rule->{errors};
2646         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2647         # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
2648         # check also other tap rules later
2649         rule_substitude_action($rule, { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" });
2650         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf);
2651     }
2652 }
2653
2654 my $MAX_NETS = 32;
2655 my $valid_netdev_names = {};
2656 for (my $i = 0; $i < $MAX_NETS; $i++)  {
2657     $valid_netdev_names->{"net$i"} = 1;
2658 }
2659
2660 sub get_mark_values {
2661     my ($value, $mask) = @_;
2662     $value = hex($value) if $value =~ /^0x/;
2663     $mask = hex($mask) if defined($mask) && $mask =~ /^0x/;
2664     $mask = 0xffffffff if !defined($mask);
2665     return ($value, $mask);
2666 }
2667
2668 sub parse_fw_rule {
2669     my ($prefix, $line, $cluster_conf, $fw_conf, $rule_env) = @_;
2670
2671     my $orig_line = $line;
2672
2673     my $rule = {};
2674
2675     # we can add single line comments to the end of the rule
2676     if ($line =~ s/#\s*(.*?)\s*$//) {
2677         $rule->{comment} = decode('utf8', $1);
2678     }
2679
2680     # we can disable a rule when prefixed with '|'
2681
2682     $rule->{enable} = $line =~ s/^\|// ? 0 : 1;
2683
2684     $line =~ s/^(\S+)\s+(\S+)\s*// ||
2685         die "unable to parse rule: $line\n";
2686
2687     $rule->{type} = lc($1);
2688     $rule->{action} = $2;
2689
2690     if ($rule->{type} eq  'in' || $rule->{type} eq 'out') {
2691         if ($rule->{action} =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
2692             $rule->{macro} = $1;
2693             $rule->{action} = $2;
2694         }
2695     }
2696
2697     while (length($line)) {
2698         if ($line =~ s/^-i (\S+)\s*//) {
2699             $rule->{iface} = $1;
2700             next;
2701         }
2702
2703         last if $rule->{type} eq 'group';
2704
2705         if ($line =~ s/^-p (\S+)\s*//) {
2706             $rule->{proto} = $1;
2707             next;
2708         }
2709
2710         if ($line =~ s/^-dport (\S+)\s*//) {
2711             $rule->{dport} = $1;
2712             next;
2713         }
2714
2715         if ($line =~ s/^-sport (\S+)\s*//) {
2716             $rule->{sport} = $1;
2717             next;
2718         }
2719         if ($line =~ s/^-source (\S+)\s*//) {
2720             $rule->{source} = $1;
2721             next;
2722         }
2723         if ($line =~ s/^-dest (\S+)\s*//) {
2724             $rule->{dest} = $1;
2725             next;
2726         }
2727         if ($line =~ s/^-log (emerg|alert|crit|err|warning|notice|info|debug|nolog)\s*//) {
2728             $rule->{log} = $1;
2729             next;
2730         }
2731
2732         last;
2733     }
2734
2735     die "unable to parse rule parameters: $line\n" if length($line);
2736
2737     $rule = verify_rule($rule, $cluster_conf, $fw_conf, $rule_env, 1);
2738     if ($rule->{errors}) {
2739         # The verbose flag really means we're running from the CLI and want
2740         # output on the console - in the other case we really want such errors
2741         # to go into the syslog instead.
2742         my $log = $verbose ? sub { warn @_ } : sub { syslog(err => @_) };
2743         $log->("$prefix - errors in rule parameters: $orig_line\n");
2744         foreach my $p (keys %{$rule->{errors}}) {
2745             $log->("  $p: $rule->{errors}->{$p}\n");
2746         }
2747     }
2748
2749     return $rule;
2750 }
2751
2752 sub verify_ethertype {
2753     my ($value) = @_;
2754     my $types = get_etc_ethertypes();
2755     die "unknown ethernet protocol type: $value\n"
2756         if !defined($types->{byname}->{$value}) &&
2757            !defined($types->{byid}->{$value});
2758 }
2759
2760 sub parse_vmfw_option {
2761     my ($line) = @_;
2762
2763     my ($opt, $value);
2764
2765     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2766
2767     if ($line =~ m/^(enable|dhcp|ndp|radv|macfilter|ipfilter|ips):\s*(0|1)\s*$/i) {
2768         $opt = lc($1);
2769         $value = int($2);
2770     } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
2771         $opt = lc($1);
2772         $value = $2 ? lc($3) : '';
2773     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2774         $opt = lc($1);
2775         $value = uc($3);
2776     } elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
2777         $opt = lc($1);
2778         $value = $2;
2779     } elsif ($line =~ m/^(layer2_protocols):\s*(((\S+)[,]?)+)\s*$/i) {
2780         $opt = lc($1);
2781         $value = $2;
2782         verify_ethertype($_) foreach split(/\s*,\s*/, $value);
2783     } else {
2784         die "can't parse option '$line'\n"
2785     }
2786
2787     return ($opt, $value);
2788 }
2789
2790 sub parse_hostfw_option {
2791     my ($line) = @_;
2792
2793     my ($opt, $value);
2794
2795     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2796
2797     if ($line =~ m/^(enable|nosmurfs|tcpflags|ndp|log_nf_conntrack|nf_conntrack_allow_invalid|protection_synflood):\s*(0|1)\s*$/i) {
2798         $opt = lc($1);
2799         $value = int($2);
2800     } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
2801         $opt = lc($1);
2802         $value = $2 ? lc($3) : '';
2803     } elsif ($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) {
2804         $opt = lc($1);
2805         $value = int($2);
2806     } else {
2807         die "can't parse option '$line'\n"
2808     }
2809
2810     return ($opt, $value);
2811 }
2812
2813 sub parse_clusterfw_option {
2814     my ($line) = @_;
2815
2816     my ($opt, $value);
2817
2818     if ($line =~ m/^(enable):\s*(\d+)\s*$/i) {
2819         $opt = lc($1);
2820         $value = int($2);
2821         if (($value > 1) && ((time() - $value) > 60)) {
2822             $value = 0
2823         }
2824     } elsif ($line =~ m/^(ebtables):\s*(0|1)\s*$/i) {
2825         $opt = lc($1);
2826         $value = int($2);
2827     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2828         $opt = lc($1);
2829         $value = uc($3);
2830     } elsif ($line =~ m/^(log_ratelimit):\s*(\S+)\s*$/) {
2831         $opt = lc($1);
2832         $value = $2;
2833     } else {
2834         die "can't parse option '$line'\n"
2835     }
2836
2837     return ($opt, $value);
2838 }
2839
2840 sub resolve_alias {
2841     my ($clusterfw_conf, $fw_conf, $cidr) = @_;
2842
2843     my $alias = lc($cidr);
2844     my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2845     $e = $clusterfw_conf->{aliases}->{$alias} if !$e && $clusterfw_conf;
2846
2847     die "no such alias '$cidr'\n" if !$e;;
2848
2849     return wantarray ? ($e->{cidr}, $e->{ipversion}) : $e->{cidr};
2850 }
2851
2852 sub parse_ip_or_cidr {
2853     my ($cidr) = @_;
2854
2855     my $ipversion;
2856
2857     if ($cidr =~ m!^(?:$IPV6RE)(/(\d+))?$!) {
2858         $cidr =~ s|/128$||;
2859         $ipversion = 6;
2860     } elsif ($cidr =~ m!^(?:$IPV4RE)(/(\d+))?$!) {
2861         $cidr =~ s|/32$||;
2862         $ipversion = 4;
2863     } else {
2864         die "value does not look like a valid IP address or CIDR network\n";
2865     }
2866
2867     return wantarray ? ($cidr, $ipversion) : $cidr;
2868 }
2869
2870 sub parse_alias {
2871     my ($line) = @_;
2872
2873     # we can add single line comments to the end of the line
2874     my $comment = decode('utf8', $1) if $line =~ s/\s*#\s*(.*?)\s*$//;
2875
2876     if ($line =~ m/^(\S+)\s(\S+)$/) {
2877         my ($name, $cidr) = ($1, $2);
2878         my $ipversion;
2879
2880         ($cidr, $ipversion) = parse_ip_or_cidr($cidr);
2881
2882         my $data = {
2883             name => $name,
2884             cidr => $cidr,
2885             ipversion => $ipversion,
2886         };
2887         $data->{comment} = $comment  if $comment;
2888         return $data;
2889     }
2890
2891     return undef;
2892 }
2893
2894 sub generic_fw_config_parser {
2895     my ($filename, $cluster_conf, $empty_conf, $rule_env) = @_;
2896
2897     my $section;
2898     my $group;
2899
2900     my $res = $empty_conf;
2901
2902     my $raw;
2903     if ($filename =~ m!^/etc/pve/(.*)$!) {
2904         $raw = PVE::Cluster::get_config($1);
2905     } else {
2906         $raw = eval { PVE::Tools::file_get_contents($filename) }; # ignore errors
2907     }
2908     return {} if !$raw;
2909
2910     my $curr_group_keys = {};
2911
2912     my $linenr = 0;
2913     while ($raw =~ /^\h*(.*?)\h*$/gm) {
2914         my $line = $1;
2915         $linenr++;
2916         next if $line =~ m/^#/;
2917         next if $line =~ m/^\s*$/;
2918         chomp $line;
2919
2920         my $prefix = "$filename (line $linenr)";
2921
2922         if ($empty_conf->{options} && ($line =~ m/^\[options\]$/i)) {
2923             $section = 'options';
2924             next;
2925         }
2926
2927         if ($empty_conf->{aliases} && ($line =~ m/^\[aliases\]$/i)) {
2928             $section = 'aliases';
2929             next;
2930         }
2931
2932         if ($empty_conf->{groups} && ($line =~ m/^\[group\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2933             $section = 'groups';
2934             $group = lc($1);
2935             my $comment = $2;
2936             eval {
2937                 die "security group name too long\n" if length($group) > $max_group_name_length;
2938                 die "invalid security group name '$group'\n" if $group !~ m/^${security_group_name_pattern}$/;
2939             };
2940             if (my $err = $@) {
2941                 ($section, $group, $comment) = undef;
2942                 warn "$prefix: $err";
2943                 next;
2944             }
2945
2946             $res->{$section}->{$group} = [];
2947             $res->{group_comments}->{$group} =  decode('utf8', $comment)
2948                 if $comment;
2949             next;
2950         }
2951
2952         if ($empty_conf->{rules} && ($line =~ m/^\[rules\]$/i)) {
2953             $section = 'rules';
2954             next;
2955         }
2956
2957         if ($empty_conf->{ipset} && ($line =~ m/^\[ipset\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2958             $section = 'ipset';
2959             $group = lc($1);
2960             my $comment = $2;
2961             eval {
2962                 die "ipset name too long\n" if length($group) > $max_ipset_name_length;
2963                 die "invalid ipset name '$group'\n" if $group !~ m/^${ipset_name_pattern}$/;
2964             };
2965             if (my $err = $@) {
2966                 ($section, $group, $comment) = undef;
2967                 warn "$prefix: $err";
2968                 next;
2969             }
2970
2971             $res->{$section}->{$group} = [];
2972             $curr_group_keys = {};
2973
2974             $res->{ipset_comments}->{$group} = decode('utf8', $comment)
2975                 if $comment;
2976             next;
2977         }
2978
2979         if (!$section) {
2980             warn "$prefix: skip line - no section\n";
2981             next;
2982         }
2983
2984         if ($section eq 'options') {
2985             eval {
2986                 my ($opt, $value);
2987                 if ($rule_env eq 'cluster') {
2988                     ($opt, $value) = parse_clusterfw_option($line);
2989                 } elsif ($rule_env eq 'host') {
2990                     ($opt, $value) = parse_hostfw_option($line);
2991                 } else {
2992                     ($opt, $value) = parse_vmfw_option($line);
2993                 }
2994                 $res->{options}->{$opt} = $value;
2995             };
2996             warn "$prefix: $@" if $@;
2997         } elsif ($section eq 'aliases') {
2998             eval {
2999                 my $data = parse_alias($line);
3000                 $res->{aliases}->{lc($data->{name})} = $data;
3001             };
3002             warn "$prefix: $@" if $@;
3003         } elsif ($section eq 'rules') {
3004             my $rule;
3005             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, $res, $rule_env); };
3006             if (my $err = $@) {
3007                 warn "$prefix: $err";
3008                 next;
3009             }
3010             push @{$res->{$section}}, $rule;
3011         } elsif ($section eq 'groups') {
3012             my $rule;
3013             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, undef, 'group'); };
3014             if (my $err = $@) {
3015                 warn "$prefix: $err";
3016                 next;
3017             }
3018             push @{$res->{$section}->{$group}}, $rule;
3019         } elsif ($section eq 'ipset') {
3020             # we can add single line comments to the end of the rule
3021             my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
3022
3023             $line =~ m/^(\!)?\s*(\S+)\s*$/;
3024             my $nomatch = $1;
3025             my $cidr = $2;
3026             my $errors;
3027
3028             if ($nomatch && !$feature_ipset_nomatch) {
3029                 $errors->{nomatch} = "nomatch not supported by kernel";
3030             }
3031
3032             eval {
3033                 if ($cidr =~ m/^${ip_alias_pattern}$/) {
3034                     resolve_alias($cluster_conf, $res, $cidr); # make sure alias exists
3035                 } else {
3036                     $cidr = parse_ip_or_cidr($cidr);
3037                 }
3038                 die "duplicate ipset entry for '$cidr'\n"
3039                     if defined($curr_group_keys->{$cidr});
3040             };
3041             if (my $err = $@) {
3042                 chomp $err;
3043                 $errors->{cidr} = $err;
3044             }
3045
3046             if ($cidr =~ m!/0+$!) {
3047                 $errors->{cidr} = "a zero prefix is not allowed in ipset entries\n";
3048             }
3049
3050             my $entry = { cidr => $cidr };
3051             $entry->{nomatch} = 1 if $nomatch;
3052             $entry->{comment} = $comment if $comment;
3053             $entry->{errors} =  $errors if $errors;
3054
3055             if ($verbose && $errors) {
3056                 warn "$prefix - errors in ipset '$group': $line\n";
3057                 foreach my $p (keys %{$errors}) {
3058                     warn "  $p: $errors->{$p}\n";
3059                 }
3060             }
3061
3062             push @{$res->{$section}->{$group}}, $entry;
3063             $curr_group_keys->{$cidr} = 1;
3064         } else {
3065             warn "$prefix: skip line - unknown section\n";
3066             next;
3067         }
3068     }
3069
3070     return $res;
3071 }
3072
3073 # this is only used to prevent concurrent runs of rule compilation/application
3074 # see lock_*_conf for cfs locks protectiong config modification
3075 sub run_locked {
3076     my ($code, @param) = @_;
3077
3078     my $timeout = 10;
3079
3080     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
3081
3082     die $@ if $@;
3083
3084     return $res;
3085 }
3086
3087 sub read_local_vm_config {
3088
3089     my $qemu = {};
3090     my $lxc = {};
3091
3092     my $vmdata = { qemu => $qemu, lxc => $lxc };
3093
3094     my $vmlist = PVE::Cluster::get_vmlist();
3095     return $vmdata if !$vmlist || !$vmlist->{ids};
3096     my $ids = $vmlist->{ids};
3097
3098     foreach my $vmid (keys %$ids) {
3099         next if !$vmid; # skip VE0
3100         my $d = $ids->{$vmid};
3101         next if !$d->{node} || $d->{node} ne $nodename;
3102         next if !$d->{type};
3103         if ($d->{type} eq 'qemu') {
3104             if ($have_qemu_server) {
3105                 my $cfspath = PVE::QemuConfig->cfs_config_path($vmid);
3106                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
3107                     $qemu->{$vmid} = $conf;
3108                 }
3109             }
3110         } elsif ($d->{type} eq 'lxc') {
3111             if ($have_lxc) {
3112                 my $cfspath = PVE::LXC::Config->cfs_config_path($vmid);
3113                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
3114                     $lxc->{$vmid} = $conf;
3115                 }
3116             }
3117         }
3118     }
3119
3120     return $vmdata;
3121 };
3122
3123 sub lock_vmfw_conf {
3124     my ($vmid, $timeout, $code, @param) = @_;
3125
3126     die "can't lock VM firewall config for undefined VMID\n"
3127         if !defined($vmid);
3128
3129     my $res = PVE::Cluster::cfs_lock_firewall("vm-$vmid", $timeout, $code, @param);
3130     die $@ if $@;
3131
3132     return $res;
3133 }
3134
3135 sub load_vmfw_conf {
3136     my ($cluster_conf, $rule_env, $vmid, $dir) = @_;
3137
3138     $dir = $pvefw_conf_dir if !defined($dir);
3139     my $filename = "$dir/$vmid.fw";
3140
3141     my $empty_conf = {
3142         rules => [],
3143         options => {},
3144         aliases => {},
3145         ipset => {} ,
3146         ipset_comments => {},
3147     };
3148
3149     my $vmfw_conf = generic_fw_config_parser($filename, $cluster_conf, $empty_conf, $rule_env);
3150     $vmfw_conf->{vmid} = $vmid;
3151
3152     return $vmfw_conf;
3153 }
3154
3155 my $format_rules = sub {
3156     my ($rules, $allow_iface) = @_;
3157
3158     my $raw = '';
3159
3160     foreach my $rule (@$rules) {
3161         if ($rule->{type} eq  'in' || $rule->{type} eq 'out' || $rule->{type} eq 'group') {
3162             $raw .= '|' if defined($rule->{enable}) && !$rule->{enable};
3163             $raw .= uc($rule->{type});
3164             if ($rule->{macro}) {
3165                 $raw .= " $rule->{macro}($rule->{action})";
3166             } else {
3167                 $raw .= " " . $rule->{action};
3168             }
3169             if ($allow_iface && $rule->{iface}) {
3170                 $raw .= " -i $rule->{iface}";
3171             }
3172
3173             if ($rule->{type} ne  'group')  {
3174                 $raw .= " -source $rule->{source}" if $rule->{source};
3175                 $raw .= " -dest $rule->{dest}" if $rule->{dest};
3176                 $raw .= " -p $rule->{proto}" if $rule->{proto};
3177                 $raw .= " -dport $rule->{dport}" if $rule->{dport};
3178                 $raw .= " -sport $rule->{sport}" if $rule->{sport};
3179                 $raw .= " -log $rule->{log}" if $rule->{log};
3180             }
3181
3182             $raw .= " # " . encode('utf8', $rule->{comment})
3183                 if $rule->{comment} && $rule->{comment} !~ m/^\s*$/;
3184             $raw .= "\n";
3185         } else {
3186             die "unknown rule type '$rule->{type}'";
3187         }
3188     }
3189
3190     return $raw;
3191 };
3192
3193 my $format_options = sub {
3194     my ($options) = @_;
3195
3196     my $raw = '';
3197
3198     $raw .= "[OPTIONS]\n\n";
3199     foreach my $opt (keys %$options) {
3200         $raw .= "$opt: $options->{$opt}\n";
3201     }
3202     $raw .= "\n";
3203
3204     return $raw;
3205 };
3206
3207 my $format_aliases = sub {
3208     my ($aliases) = @_;
3209
3210     my $raw = '';
3211
3212     $raw .= "[ALIASES]\n\n";
3213     foreach my $k (keys %$aliases) {
3214         my $e = $aliases->{$k};
3215         $raw .= "$e->{name} $e->{cidr}";
3216         $raw .= " # " . encode('utf8', $e->{comment})
3217             if $e->{comment} && $e->{comment} !~ m/^\s*$/;
3218         $raw .= "\n";
3219     }
3220     $raw .= "\n";
3221
3222     return $raw;
3223 };
3224
3225 my $format_ipsets = sub {
3226     my ($fw_conf) = @_;
3227
3228     my $raw = '';
3229
3230     foreach my $ipset (sort keys %{$fw_conf->{ipset}}) {
3231         if (my $comment = $fw_conf->{ipset_comments}->{$ipset}) {
3232             my $utf8comment = encode('utf8', $comment);
3233             $raw .= "[IPSET $ipset] # $utf8comment\n\n";
3234         } else {
3235             $raw .= "[IPSET $ipset]\n\n";
3236         }
3237         my $options = $fw_conf->{ipset}->{$ipset};
3238
3239         my $nethash = {};
3240         foreach my $entry (@$options) {
3241             my $cidr = $entry->{cidr};
3242             if (defined($nethash->{$cidr})) {
3243                 warn "ignoring duplicate ipset entry '$cidr'\n";
3244                 next;
3245             }
3246
3247             $nethash->{$cidr} = $entry;
3248         }
3249
3250         foreach my $cidr (sort keys %$nethash) {
3251             my $entry = $nethash->{$cidr};
3252             my $line = $entry->{nomatch} ? '!' : '';
3253             $line .= $entry->{cidr};
3254             $line .= " # " . encode('utf8', $entry->{comment})
3255                 if $entry->{comment} && $entry->{comment} !~ m/^\s*$/;
3256             $raw .= "$line\n";
3257         }
3258
3259         $raw .= "\n";
3260     }
3261
3262     return $raw;
3263 };
3264
3265 sub save_vmfw_conf {
3266     my ($vmid, $vmfw_conf) = @_;
3267
3268     my $raw = '';
3269
3270     my $options = $vmfw_conf->{options};
3271     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3272
3273     my $aliases = $vmfw_conf->{aliases};
3274     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3275
3276     $raw .= &$format_ipsets($vmfw_conf) if $vmfw_conf->{ipset};
3277
3278     my $rules = $vmfw_conf->{rules} || [];
3279     if ($rules && scalar(@$rules)) {
3280         $raw .= "[RULES]\n\n";
3281         $raw .= &$format_rules($rules, 1);
3282         $raw .= "\n";
3283     }
3284
3285     my $filename = "$pvefw_conf_dir/$vmid.fw";
3286     if ($raw) {
3287         mkdir $pvefw_conf_dir;
3288         PVE::Tools::file_set_contents($filename, $raw);
3289     } else {
3290         unlink $filename;
3291     }
3292 }
3293
3294 sub remove_vmfw_conf {
3295     my ($vmid) = @_;
3296
3297     my $vmfw_conffile = "$pvefw_conf_dir/$vmid.fw";
3298
3299     unlink $vmfw_conffile;
3300 }
3301
3302 sub clone_vmfw_conf {
3303     my ($vmid, $newid) = @_;
3304
3305     my $sourcevm_conffile = "$pvefw_conf_dir/$vmid.fw";
3306     my $clonevm_conffile = "$pvefw_conf_dir/$newid.fw";
3307
3308     lock_vmfw_conf($newid, 10, sub {
3309         if (-f $clonevm_conffile) {
3310             unlink $clonevm_conffile;
3311         }
3312         if (-f $sourcevm_conffile) {
3313             my $data = PVE::Tools::file_get_contents($sourcevm_conffile);
3314             PVE::Tools::file_set_contents($clonevm_conffile, $data);
3315         }
3316     });
3317 }
3318
3319 sub read_vm_firewall_configs {
3320     my ($cluster_conf, $vmdata, $dir) = @_;
3321
3322     my $vmfw_configs = {};
3323
3324     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3325         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'vm', $vmid, $dir);
3326         next if !$vmfw_conf->{options}; # skip if file does not exist
3327         $vmfw_configs->{$vmid} = $vmfw_conf;
3328     }
3329     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3330         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'ct', $vmid, $dir);
3331         next if !$vmfw_conf->{options}; # skip if file does not exist
3332         $vmfw_configs->{$vmid} = $vmfw_conf;
3333     }
3334
3335     return $vmfw_configs;
3336 }
3337
3338 sub get_option_log_level {
3339     my ($options, $k) = @_;
3340
3341     my $v = $options->{$k};
3342     $v = $default_log_level if !defined($v);
3343
3344     return undef if $v eq '' || $v eq 'nolog';
3345
3346     return $v if defined($log_level_hash->{$v});
3347
3348     warn "unknown log level ($k = '$v')\n";
3349
3350     return undef;
3351 }
3352
3353 sub generate_std_chains {
3354     my ($ruleset, $options, $ipversion) = @_;
3355
3356     my $std_chains = $pve_std_chains->{$ipversion} || die "internal error";
3357
3358     my $loglevel = get_option_log_level($options, 'smurf_log_level');
3359     my $chain = 'PVEFW-smurflog';
3360     if ( $std_chains->{$chain} ) {
3361         foreach my $r (@{$std_chains->{$chain}}) {
3362           $r->{log} = $loglevel;
3363         }
3364     }
3365
3366     # same as shorewall logflags action.
3367     $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
3368     $chain = 'PVEFW-logflags';
3369     if ( $std_chains->{$chain} ) {
3370         foreach my $r (@{$std_chains->{$chain}}) {
3371           $r->{log} = $loglevel;
3372         }
3373     }
3374
3375     foreach my $chain (keys %$std_chains) {
3376         ruleset_create_chain($ruleset, $chain);
3377         foreach my $rule (@{$std_chains->{$chain}}) {
3378             if (ref($rule)) {
3379                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, 0);
3380             } else {
3381                 die "rule $rule as string - should not happen";
3382             }
3383         }
3384     }
3385 }
3386
3387 sub generate_ipset_chains {
3388     my ($ipset_ruleset, $clusterfw_conf, $fw_conf, $device_ips, $ipsets) = @_;
3389
3390     foreach my $ipset (keys %{$ipsets}) {
3391
3392         my $options = $ipsets->{$ipset};
3393
3394         if ($device_ips && $ipset =~ /^ipfilter-(net\d+)$/) {
3395             if (my $ips = $device_ips->{$1}) {
3396                 $options = [@$options, @$ips];
3397             }
3398         }
3399
3400         # remove duplicates
3401         my $nethash = {};
3402         foreach my $entry (@$options) {
3403             next if $entry->{errors}; # skip entries with errors
3404             eval {
3405                 my ($cidr, $ver);
3406                 if ($entry->{cidr} =~ m/^${ip_alias_pattern}$/) {
3407                     ($cidr, $ver) = resolve_alias($clusterfw_conf, $fw_conf, $entry->{cidr});
3408                 } else {
3409                     ($cidr, $ver) = parse_ip_or_cidr($entry->{cidr});
3410                 }
3411                 #http://backreference.org/2013/03/01/ipv6-address-normalization/
3412                 if ($ver == 6) {
3413                     # ip_compress_address takes an address only, no CIDR
3414                     my ($addr, $prefix_len) = ($cidr =~ m@^([^/]*)(/.*)?$@);
3415                     $cidr = lc(Net::IP::ip_compress_address($addr, 6));
3416                     $cidr .= $prefix_len if defined($prefix_len);
3417                     $cidr =~ s|/128$||;
3418                 } else {
3419                     $cidr =~ s|/32$||;
3420                 }
3421
3422                 $nethash->{$ver}->{$cidr} = { cidr => $cidr, nomatch => $entry->{nomatch} };
3423             };
3424             warn $@ if $@;
3425         }
3426
3427         foreach my $ipversion (4, 6) {
3428             my $data = $nethash->{$ipversion};
3429
3430             my $name = compute_ipset_chain_name($fw_conf->{vmid}, $ipset, $ipversion);
3431
3432             my $hashsize = scalar(@$options);
3433             if ($hashsize <= 64) {
3434                 $hashsize = 64;
3435             } else {
3436                 $hashsize = round_powerof2($hashsize);
3437             }
3438
3439             my $family = $ipversion == "6" ? "inet6" : "inet";
3440
3441             $ipset_ruleset->{$name} = ["create $name hash:net family $family hashsize $hashsize maxelem $hashsize"];
3442
3443             foreach my $cidr (sort keys %$data) {
3444                 my $entry = $data->{$cidr};
3445
3446                 my $cmd = "add $name $cidr";
3447                 if ($entry->{nomatch}) {
3448                     if ($feature_ipset_nomatch) {
3449                         push @{$ipset_ruleset->{$name}}, "$cmd nomatch";
3450                     } else {
3451                         warn "ignore !$cidr - nomatch not supported by kernel\n";
3452                     }
3453                 } else {
3454                     push @{$ipset_ruleset->{$name}}, $cmd;
3455                 }
3456             }
3457         }
3458     }
3459 }
3460
3461 sub round_powerof2 {
3462     my ($int) = @_;
3463
3464     $int--;
3465     $int |= $int >> $_ foreach (1,2,4,8,16);
3466     return ++$int;
3467 }
3468
3469 my $set_global_log_ratelimit = sub {
3470     my $cluster_opts = shift;
3471
3472     $global_log_ratelimit = '--limit 1/sec';
3473     if (defined(my $log_rlimit = $cluster_opts->{log_ratelimit})) {
3474         my $ll_format = $cluster_option_properties->{log_ratelimit}->{format};
3475         my $limit = PVE::JSONSchema::parse_property_string($ll_format, $log_rlimit);
3476
3477         if ($limit->{enable}) {
3478             if (my $rate = $limit->{rate}) {
3479                 $global_log_ratelimit = "--limit $rate";
3480             }
3481             if (my $burst = $limit->{burst}) {
3482                 $global_log_ratelimit .= " --limit-burst $burst";
3483             }
3484         } else {
3485             $global_log_ratelimit = undef;
3486         }
3487     }
3488 };
3489
3490 sub lock_clusterfw_conf {
3491     my ($timeout, $code, @param) = @_;
3492
3493     my $res = PVE::Cluster::cfs_lock_firewall("cluster", $timeout, $code, @param);
3494     die $@ if $@;
3495
3496     return $res;
3497 }
3498
3499 sub load_clusterfw_conf {
3500     my ($filename) = @_;
3501
3502     $filename = $clusterfw_conf_filename if !defined($filename);
3503     my $empty_conf = {
3504         rules => [],
3505         options => {},
3506         aliases => {},
3507         groups => {},
3508         group_comments => {},
3509         ipset => {} ,
3510         ipset_comments => {},
3511     };
3512
3513     my $cluster_conf = generic_fw_config_parser($filename, $empty_conf, $empty_conf, 'cluster');
3514     $set_global_log_ratelimit->($cluster_conf->{options});
3515
3516     return $cluster_conf;
3517 }
3518
3519 sub save_clusterfw_conf {
3520     my ($cluster_conf) = @_;
3521
3522     my $raw = '';
3523
3524     my $options = $cluster_conf->{options};
3525     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3526
3527     my $aliases = $cluster_conf->{aliases};
3528     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3529
3530     $raw .= &$format_ipsets($cluster_conf) if $cluster_conf->{ipset};
3531
3532     my $rules = $cluster_conf->{rules};
3533     if ($rules && scalar(@$rules)) {
3534         $raw .= "[RULES]\n\n";
3535         $raw .= &$format_rules($rules, 1);
3536         $raw .= "\n";
3537     }
3538
3539     if ($cluster_conf->{groups}) {
3540         foreach my $group (sort keys %{$cluster_conf->{groups}}) {
3541             my $rules = $cluster_conf->{groups}->{$group};
3542             if (my $comment = $cluster_conf->{group_comments}->{$group}) {
3543                 my $utf8comment = encode('utf8', $comment);
3544                 $raw .= "[group $group] # $utf8comment\n\n";
3545             } else {
3546                 $raw .= "[group $group]\n\n";
3547             }
3548
3549             $raw .= &$format_rules($rules, 0);
3550             $raw .= "\n";
3551         }
3552     }
3553
3554     if ($raw) {
3555         mkdir $pvefw_conf_dir;
3556         PVE::Tools::file_set_contents($clusterfw_conf_filename, $raw);
3557     } else {
3558         unlink $clusterfw_conf_filename;
3559     }
3560 }
3561
3562 sub lock_hostfw_conf {
3563     my ($timeout, $code, @param) = @_;
3564
3565     my $res = PVE::Cluster::cfs_lock_firewall("host-$nodename", $timeout, $code, @param);
3566     die $@ if $@;
3567
3568     return $res;
3569 }
3570
3571 sub load_hostfw_conf {
3572     my ($cluster_conf, $filename) = @_;
3573
3574     $filename = $hostfw_conf_filename if !defined($filename);
3575
3576     my $empty_conf = { rules => [], options => {}};
3577     return generic_fw_config_parser($filename, $cluster_conf, $empty_conf, 'host');
3578 }
3579
3580 sub save_hostfw_conf {
3581     my ($hostfw_conf) = @_;
3582
3583     my $raw = '';
3584
3585     my $options = $hostfw_conf->{options};
3586     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3587
3588     my $rules = $hostfw_conf->{rules};
3589     if ($rules && scalar(@$rules)) {
3590         $raw .= "[RULES]\n\n";
3591         $raw .= &$format_rules($rules, 1);
3592         $raw .= "\n";
3593     }
3594
3595     if ($raw) {
3596         PVE::Tools::file_set_contents($hostfw_conf_filename, $raw);
3597     } else {
3598         unlink $hostfw_conf_filename;
3599     }
3600 }
3601
3602 sub compile {
3603     my ($cluster_conf, $hostfw_conf, $vmdata, $corosync_conf) = @_;
3604
3605     my $vmfw_configs;
3606
3607     # fixme: once we read standard chains from config this needs to be put in test/standard cases below
3608     $pve_std_chains = dclone($pve_std_chains_conf);
3609
3610     if ($vmdata) { # test mode
3611         my $testdir = $vmdata->{testdir} || die "no test directory specified";
3612         my $filename = "$testdir/cluster.fw";
3613         $cluster_conf = load_clusterfw_conf($filename);
3614
3615         $filename = "$testdir/host.fw";
3616         $hostfw_conf = load_hostfw_conf($cluster_conf, $filename);
3617
3618         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, $testdir);
3619     } else { # normal operation
3620         $cluster_conf = load_clusterfw_conf(undef) if !$cluster_conf;
3621
3622         $hostfw_conf = load_hostfw_conf($cluster_conf, undef) if !$hostfw_conf;
3623
3624         # cfs_update is handled by daemon or API
3625         $corosync_conf = PVE::Cluster::cfs_read_file("corosync.conf")
3626             if !defined($corosync_conf) && PVE::Corosync::check_conf_exists(1);
3627
3628         $vmdata = read_local_vm_config();
3629         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, undef);
3630     }
3631
3632     return ({},{},{},{}) if !$cluster_conf->{options}->{enable};
3633
3634     my $localnet;
3635     if ($cluster_conf->{aliases}->{local_network}) {
3636         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3637     } else {
3638         my $localnet_ver;
3639         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3640
3641         $cluster_conf->{aliases}->{local_network} = {
3642             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3643     }
3644
3645     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3646
3647     my $ruleset = {};
3648     my $rulesetv6 = {};
3649     $ruleset->{filter} = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 4);
3650     $ruleset->{raw} = compile_iptables_raw($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 4);
3651     $rulesetv6->{filter} = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 6);
3652     $rulesetv6->{raw} = compile_iptables_raw($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 6);
3653     my $ebtables_ruleset = compile_ebtables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata);
3654     my $ipset_ruleset = compile_ipsets($cluster_conf, $vmfw_configs, $vmdata);
3655
3656     return ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
3657 }
3658
3659 sub compile_iptables_raw {
3660     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, $ipversion) = @_;
3661
3662     my $ruleset = {};
3663
3664     my $hostfw_options = $hostfw_conf->{options} || {};
3665     my $protection_synflood = $hostfw_options->{protection_synflood} || 0;
3666
3667     if($protection_synflood) {
3668
3669         my $protection_synflood_rate = $hostfw_options->{protection_synflood_rate} ? $hostfw_options->{protection_synflood_rate} : 200;
3670         my $protection_synflood_burst = $hostfw_options->{protection_synflood_burst} ? $hostfw_options->{protection_synflood_burst} : 1000;
3671         my $protection_synflood_limit = $hostfw_options->{protection_synflood_limit} ? $hostfw_options->{protection_synflood_limit} : 3000;
3672         my $protection_synflood_expire = $hostfw_options->{nf_conntrack_tcp_timeout_syn_recv} ? $hostfw_options->{nf_conntrack_tcp_timeout_syn_recv} : 60;
3673         $protection_synflood_expire = $protection_synflood_expire * 1000;
3674         my $protection_synflood_mask = $ipversion == 4 ? 32 : 64;
3675
3676         ruleset_create_chain($ruleset, "PVEFW-PREROUTING");
3677         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");
3678     }
3679
3680     return $ruleset;
3681 }
3682
3683 sub compile_iptables_filter {
3684     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, $ipversion) = @_;
3685
3686     my $ruleset = {};
3687
3688     ruleset_create_chain($ruleset, "PVEFW-INPUT");
3689     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
3690
3691     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3692
3693     my $hostfw_options = $hostfw_conf->{options} || {};
3694
3695     # fixme: what log level should we use here?
3696     my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
3697
3698     my $conn_allow_invalid = $hostfw_options->{nf_conntrack_allow_invalid} // 0;
3699     ruleset_chain_add_conn_filters($ruleset, "PVEFW-FORWARD", $conn_allow_invalid, "ACCEPT");
3700
3701     ruleset_create_chain($ruleset, "PVEFW-FWBR-IN");
3702     ruleset_chain_add_input_filters($ruleset, "PVEFW-FWBR-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
3703
3704     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-in fwln+", "-j PVEFW-FWBR-IN");
3705
3706     ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3707     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-out fwln+", "-j PVEFW-FWBR-OUT");
3708
3709     generate_std_chains($ruleset, $hostfw_options, $ipversion);
3710
3711     my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
3712
3713     if ($hostfw_enable) {
3714         eval { enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf, $ipversion, $corosync_conf); };
3715         warn $@ if $@; # just to be sure - should not happen
3716     }
3717
3718     # generate firewall rules for QEMU VMs
3719     foreach my $vmid (sort keys %{$vmdata->{qemu}}) {
3720         eval {
3721             my $conf = $vmdata->{qemu}->{$vmid};
3722             my $vmfw_conf = $vmfw_configs->{$vmid};
3723             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3724
3725             foreach my $netid (sort keys %$conf) {
3726                 next if $netid !~ m/^net(\d+)$/;
3727                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3728                 next if !$net->{firewall};
3729
3730                 my $iface = "tap${vmid}i$1";
3731                 my $macaddr = $net->{macaddr};
3732                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3733                                              $vmfw_conf, $vmid, 'IN', $ipversion);
3734                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3735                                              $vmfw_conf, $vmid, 'OUT', $ipversion);
3736             }
3737         };
3738         warn $@ if $@; # just to be sure - should not happen
3739     }
3740
3741     # generate firewall rules for LXC containers
3742     foreach my $vmid (sort keys %{$vmdata->{lxc}}) {
3743         eval {
3744             my $conf = $vmdata->{lxc}->{$vmid};
3745             my $vmfw_conf = $vmfw_configs->{$vmid};
3746             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3747
3748             foreach my $netid (sort keys %$conf) {
3749                 next if $netid !~ m/^net(\d+)$/;
3750                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3751                 next if !$net->{firewall};
3752
3753                 my $iface = "veth${vmid}i$1";
3754                 my $macaddr = $net->{hwaddr};
3755                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3756                                              $vmfw_conf, $vmid, 'IN', $ipversion);
3757                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3758                                              $vmfw_conf, $vmid, 'OUT', $ipversion);
3759             }
3760         };
3761         warn $@ if $@; # just to be sure - should not happen
3762     }
3763
3764     if (ruleset_chain_exist($ruleset, "PVEFW-IPS")){
3765         ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED", "-j PVEFW-IPS");
3766     }
3767
3768     return $ruleset;
3769 }
3770
3771 sub mac_to_linklocal {
3772     my ($macaddr) = @_;
3773     my @parts = split(/:/, $macaddr);
3774     # The standard link local address uses the fe80::/64 prefix with the
3775     # modified EUI-64 identifier derived from the MAC address by flipping the
3776     # universal/local bit and inserting FF:FE in the middle.
3777     # See RFC 4291.
3778     $parts[0] = sprintf("%02x", hex($parts[0]) ^ 0x02);
3779     my @meui64 = (@parts[0,1,2], 'ff', 'fe', @parts[3,4,5]);
3780     return "fe80::$parts[0]$parts[1]:$parts[2]FF:FE$parts[3]:$parts[4]$parts[5]";
3781 }
3782
3783 sub compile_ipsets {
3784     my ($cluster_conf, $vmfw_configs, $vmdata) = @_;
3785
3786     my $localnet;
3787     if ($cluster_conf->{aliases}->{local_network}) {
3788         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3789     } else {
3790         my $localnet_ver;
3791         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3792
3793         $cluster_conf->{aliases}->{local_network} = {
3794             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3795     }
3796
3797     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3798
3799
3800     my $ipset_ruleset = {};
3801
3802     # generate ipsets for QEMU VMs
3803     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3804         eval {
3805             my $conf = $vmdata->{qemu}->{$vmid};
3806             my $vmfw_conf = $vmfw_configs->{$vmid};
3807             return if !$vmfw_conf;
3808
3809             # When the 'ipfilter' option is enabled every device for which there
3810             # is no 'ipfilter-netX' ipset defiend gets an implicit empty default
3811             # ipset.
3812             # The reason is that ipfilter ipsets are always filled with standard
3813             # IPv6 link-local filters.
3814             my $ipsets = $vmfw_conf->{ipset};
3815             my $implicit_sets = {};
3816
3817             my $device_ips = {};
3818             foreach my $netid (keys %$conf) {
3819                 next if $netid !~ m/^net(\d+)$/;
3820                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3821                 next if !$net->{firewall};
3822
3823                 if ($vmfw_conf->{options}->{ipfilter} && !$ipsets->{"ipfilter-$netid"}) {
3824                     $implicit_sets->{"ipfilter-$netid"} = [];
3825                 }
3826
3827                 my $macaddr = $net->{macaddr};
3828                 my $linklocal = mac_to_linklocal($macaddr);
3829                 $device_ips->{$netid} = [
3830                     { cidr => $linklocal },
3831                     { cidr => 'fe80::/10', nomatch => 1 }
3832                 ];
3833             }
3834
3835             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $ipsets);
3836             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $implicit_sets);
3837         };
3838         warn $@ if $@; # just to be sure - should not happen
3839     }
3840
3841     # generate firewall rules for LXC containers
3842     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3843         eval {
3844             my $conf = $vmdata->{lxc}->{$vmid};
3845             my $vmfw_conf = $vmfw_configs->{$vmid};
3846             return if !$vmfw_conf;
3847
3848             # When the 'ipfilter' option is enabled every device for which there
3849             # is no 'ipfilter-netX' ipset defiend gets an implicit empty default
3850             # ipset.
3851             # The reason is that ipfilter ipsets are always filled with standard
3852             # IPv6 link-local filters, as well as the IP addresses configured
3853             # for the container.
3854             my $ipsets = $vmfw_conf->{ipset};
3855             my $implicit_sets = {};
3856
3857             my $device_ips = {};
3858             foreach my $netid (keys %$conf) {
3859                 next if $netid !~ m/^net(\d+)$/;
3860                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3861                 next if !$net->{firewall};
3862
3863                 if ($vmfw_conf->{options}->{ipfilter} && !$ipsets->{"ipfilter-$netid"}) {
3864                     $implicit_sets->{"ipfilter-$netid"} = [];
3865                 }
3866
3867                 my $macaddr = $net->{hwaddr};
3868                 my $linklocal = mac_to_linklocal($macaddr);
3869                 my $set = $device_ips->{$netid} = [
3870                     { cidr => $linklocal },
3871                     { cidr => 'fe80::/10', nomatch => 1 }
3872                 ];
3873                 if (defined($net->{ip}) && $net->{ip} =~ m!^($IPV4RE)(?:/\d+)?$!) {
3874                     push @$set, { cidr => $1 };
3875                 }
3876                 if (defined($net->{ip6}) && $net->{ip6} =~ m!^($IPV6RE)(?:/\d+)?$!) {
3877                     push @$set, { cidr => $1 };
3878                 }
3879             }
3880
3881             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $ipsets);
3882             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $implicit_sets);
3883         };
3884         warn $@ if $@; # just to be sure - should not happen
3885     }
3886
3887     generate_ipset_chains($ipset_ruleset, undef, $cluster_conf, undef, $cluster_conf->{ipset});
3888
3889     return $ipset_ruleset;
3890 }
3891
3892 sub compile_ebtables_filter {
3893     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata) = @_;
3894
3895     if (!($cluster_conf->{options}->{ebtables} // 1)) {
3896         return {};
3897     }
3898
3899     my $ruleset = {};
3900
3901     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3902
3903     ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3904     #for ipv4 and ipv6, check macaddress in iptables, so we use conntrack 'ESTABLISHED', to speedup rules
3905     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-p IPv4', '-j ACCEPT');
3906     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-p IPv6', '-j ACCEPT');
3907     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-o fwln+', '-j PVEFW-FWBR-OUT');
3908
3909     # generate firewall rules for QEMU VMs
3910     foreach my $vmid (sort keys %{$vmdata->{qemu}}) {
3911         eval {
3912             my $conf = $vmdata->{qemu}->{$vmid};
3913             my $vmfw_conf = $vmfw_configs->{$vmid};
3914             return if !$vmfw_conf;
3915             my $ipsets = $vmfw_conf->{ipset};
3916
3917             foreach my $netid (sort keys %$conf) {
3918                 next if $netid !~ m/^net(\d+)$/;
3919                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3920                 next if !$net->{firewall};
3921                 my $iface = "tap${vmid}i$1";
3922                 my $macaddr = $net->{macaddr};
3923                 my $arpfilter = [];
3924                 if (defined(my $ipset = $ipsets->{"ipfilter-$netid"})) {
3925                     foreach my $ipaddr (@$ipset) {
3926                         my($ip, $version) = parse_ip_or_cidr($ipaddr->{cidr});
3927                         next if !$ip || ($version && $version != 4);
3928                         push(@$arpfilter, $ip);
3929                     }
3930                 }
3931                 generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter);
3932             }
3933         };
3934         warn $@ if $@; # just to be sure - should not happen
3935     }
3936
3937     # generate firewall rules for LXC containers
3938     foreach my $vmid (sort keys %{$vmdata->{lxc}}) {
3939         eval {
3940             my $conf = $vmdata->{lxc}->{$vmid};
3941
3942             my $vmfw_conf = $vmfw_configs->{$vmid};
3943             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3944             my $ipsets = $vmfw_conf->{ipset};
3945
3946             foreach my $netid (sort keys %$conf) {
3947                 next if $netid !~ m/^net(\d+)$/;
3948                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3949                 next if !$net->{firewall};
3950                 my $iface = "veth${vmid}i$1";
3951                 my $macaddr = $net->{hwaddr};
3952                 my $arpfilter = [];
3953                 if (defined(my $ipset = $ipsets->{"ipfilter-$netid"})) {
3954                     foreach my $ipaddr (@$ipset) {
3955                         my($ip, $version) = parse_ip_or_cidr($ipaddr->{cidr});
3956                         next if !$ip || ($version && $version != 4);
3957                         push(@$arpfilter, $ip);
3958                     }
3959                 }
3960                 if (defined(my $ip = $net->{ip}) && $vmfw_conf->{options}->{ipfilter}) {
3961                     # ebtables changes this to a .0/MASK network but we just
3962                     # want the address here, no network - see #2193
3963                     $ip =~ s|/(\d+)$||;
3964                     if ($ip ne 'dhcp') {
3965                         push @$arpfilter, $ip;
3966                     }
3967                 }
3968                 generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter);
3969             }
3970         };
3971         warn $@ if $@; # just to be sure - should not happen
3972     }
3973
3974     return $ruleset;
3975 }
3976
3977 sub generate_tap_layer2filter {
3978     my ($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter) = @_;
3979     my $options = $vmfw_conf->{options};
3980
3981     my $tapchain = $iface."-OUT";
3982
3983     # ebtables remove zeros from mac pairs
3984     $macaddr =~ s/0([0-9a-f])/$1/ig;
3985     $macaddr = lc($macaddr);
3986
3987     ruleset_create_chain($ruleset, $tapchain);
3988
3989     if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
3990             ruleset_addrule($ruleset, $tapchain, "-s ! $macaddr", '-j DROP');
3991     }
3992
3993     if (@$arpfilter){
3994         my $arpchain = $tapchain."-ARP";
3995         ruleset_addrule($ruleset, $tapchain, "-p ARP", "-j $arpchain");
3996         ruleset_create_chain($ruleset, $arpchain);
3997
3998         foreach my $ip (@{$arpfilter}) {
3999             ruleset_addrule($ruleset, $arpchain, "-p ARP --arp-ip-src $ip", '-j RETURN');
4000         }
4001         ruleset_addrule($ruleset, $arpchain, '', '-j DROP');
4002     }
4003
4004     if (defined($options->{layer2_protocols})){
4005         my $protochain = $tapchain."-PROTO";
4006         ruleset_addrule($ruleset, $tapchain, '', "-j $protochain");
4007         ruleset_create_chain($ruleset, $protochain);
4008
4009         foreach my $proto (split(/,/, $options->{layer2_protocols})) {
4010             ruleset_addrule($ruleset, $protochain, "-p $proto", '-j RETURN');
4011         }
4012         ruleset_addrule($ruleset, $protochain, '', '-j DROP');
4013     }
4014
4015     ruleset_addrule($ruleset, $tapchain, '', '-j ACCEPT');
4016
4017     ruleset_addrule($ruleset, 'PVEFW-FWBR-OUT', "-i $iface", "-j $tapchain");
4018 }
4019
4020 # the parameter $change_only_regex changes two things if defined:
4021 # * all chains not matching it will be left intact
4022 # * both the $active_chains hash and the returned status_hash have different
4023 #   structure (they contain a key named 'rules').
4024 sub get_ruleset_status {
4025     my ($ruleset, $active_chains, $digest_fn, $change_only_regex) = @_;
4026
4027     my $statushash = {};
4028
4029     foreach my $chain (sort keys %$ruleset) {
4030         my $rules = $ruleset->{$chain};
4031         my $sig = &$digest_fn($rules);
4032         my $oldsig;
4033
4034         $statushash->{$chain}->{sig} = $sig;
4035         if (defined($change_only_regex)) {
4036             $oldsig = $active_chains->{$chain}->{sig};
4037             $statushash->{$chain}->{rules} = $rules;
4038         } else {
4039             $oldsig = $active_chains->{$chain};
4040         }
4041         if (!defined($oldsig)) {
4042             $statushash->{$chain}->{action} = 'create';
4043         } else {
4044             if ($oldsig eq $sig) {
4045                 $statushash->{$chain}->{action} = 'exists';
4046             } else {
4047                 $statushash->{$chain}->{action} = 'update';
4048             }
4049         }
4050         if ($verbose) {
4051             print "$statushash->{$chain}->{action} $chain ($sig)\n";
4052             foreach my $cmd (@{$rules}) {
4053                 print "\t$cmd\n";
4054             }
4055         }
4056     }
4057
4058     foreach my $chain (sort keys %$active_chains) {
4059         next if defined($ruleset->{$chain});
4060         my $action = 'delete';
4061         my $sig = $active_chains->{$chain};
4062         if (defined($change_only_regex)) {
4063             $action = 'ignore' if ($chain !~ m/$change_only_regex/);
4064             $statushash->{$chain}->{rules} = $active_chains->{$chain}->{rules};
4065             $sig = $sig->{sig};
4066         }
4067         $statushash->{$chain}->{action} = $action;
4068         $statushash->{$chain}->{sig} = $sig;
4069         print "$action $chain ($sig)\n" if $verbose;
4070     }
4071
4072     return $statushash;
4073 }
4074
4075 sub print_sig_rule {
4076     my ($chain, $sig) = @_;
4077
4078     # We just use this to store a SHA1 checksum used to detect changes
4079     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
4080 }
4081
4082 sub get_ruleset_cmdlist {
4083     my ($ruleset, $iptablescmd, $table) = @_;
4084
4085     $table = 'filter' if !$table;
4086
4087     my $cmdlist = "*$table\n"; # we pass this to iptables-restore;
4088
4089     my ($active_chains, $hooks) = iptables_get_chains($iptablescmd, $table);
4090     my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest);
4091
4092     # create missing chains first
4093     foreach my $chain (sort keys %$ruleset) {
4094         my $stat = $statushash->{$chain};
4095         die "internal error" if !$stat;
4096         next if $stat->{action} ne 'create';
4097
4098         $cmdlist .= ":$chain - [0:0]\n";
4099     }
4100
4101     foreach my $h (qw(INPUT OUTPUT FORWARD PREROUTING)) {
4102         my $chain = "PVEFW-$h";
4103         if ($ruleset->{$chain} && !$hooks->{$h}) {
4104             $cmdlist .= "-A $h -j $chain\n";
4105         }
4106     }
4107
4108     foreach my $chain (sort keys %$ruleset) {
4109         my $stat = $statushash->{$chain};
4110         die "internal error" if !$stat;
4111
4112         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
4113             $cmdlist .= "-F $chain\n";
4114             foreach my $cmd (@{$ruleset->{$chain}}) {
4115                 $cmdlist .= "$cmd\n";
4116             }
4117             $cmdlist .= print_sig_rule($chain, $stat->{sig});
4118         } elsif ($stat->{action} eq 'delete') {
4119             die "internal error"; # this should not happen
4120         } elsif ($stat->{action} eq 'exists') {
4121             # do nothing
4122         } else {
4123             die "internal error - unknown status '$stat->{action}'";
4124         }
4125     }
4126
4127     foreach my $chain (keys %$statushash) {
4128         next if $statushash->{$chain}->{action} ne 'delete';
4129         $cmdlist .= "-F $chain\n";
4130     }
4131     foreach my $chain (keys %$statushash) {
4132         next if $statushash->{$chain}->{action} ne 'delete';
4133         next if $chain eq 'PVEFW-INPUT';
4134         next if $chain eq 'PVEFW-OUTPUT';
4135         next if $chain eq 'PVEFW-FORWARD';
4136         next if $chain eq 'PVEFW-PREROUTING';
4137         $cmdlist .= "-X $chain\n";
4138     }
4139
4140     my $changes = $cmdlist ne "*$table\n" ? 1 : 0;
4141
4142     $cmdlist .= "COMMIT\n";
4143
4144     return wantarray ? ($cmdlist, $changes) : $cmdlist;
4145 }
4146
4147 my $pve_ebtables_chainname_regex = qr/PVEFW-\S+|(?:tap|veth)\d+i\d+-(?:IN|OUT)/;
4148
4149 sub get_ebtables_cmdlist {
4150     my ($ruleset) = @_;
4151
4152     my $changes = 0;
4153     my $cmdlist = "*filter\n";
4154
4155     my $active_chains = ebtables_get_chains();
4156     my $statushash = get_ruleset_status($ruleset, $active_chains,
4157                                         \&iptables_chain_digest,
4158                                         $pve_ebtables_chainname_regex);
4159
4160     # create chains first and make sure PVE rules are evaluated if active
4161     my $append_pve_to_forward = '-A FORWARD -j PVEFW-FORWARD';
4162     my $pve_include = 0;
4163     foreach my $chain (sort keys %$statushash) {
4164         next if ($statushash->{$chain}->{action} eq 'delete');
4165         $cmdlist .= ":$chain ACCEPT\n";
4166         $pve_include = 1 if ($chain eq 'PVEFW-FORWARD');
4167     }
4168
4169     foreach my $chain (sort keys %$statushash) {
4170         my $stat = $statushash->{$chain};
4171         $changes = 1 if ($stat->{action} !~ 'ignore|exists');
4172         next if ($stat->{action} eq 'delete');
4173
4174         foreach my $cmd (@{$statushash->{$chain}->{'rules'}}) {
4175             if ($chain eq 'FORWARD' && $cmd eq $append_pve_to_forward) {
4176                 next if ! $pve_include;
4177                 $pve_include = 0;
4178             }
4179             $cmdlist .= "$cmd\n";
4180         }
4181     }
4182     $cmdlist .= "$append_pve_to_forward\n" if $pve_include;
4183
4184     return wantarray ? ($cmdlist, $changes) : $cmdlist;
4185 }
4186
4187 sub get_ipset_cmdlist {
4188     my ($ruleset) = @_;
4189
4190     my $cmdlist = "";
4191
4192     my $delete_cmdlist = "";
4193
4194     my $active_chains = ipset_get_chains();
4195     my $statushash = get_ruleset_status($ruleset, $active_chains, \&ipset_chain_digest);
4196
4197     # remove stale _swap chains
4198     foreach my $chain (keys %$active_chains) {
4199         if ($chain =~ m/^PVEFW-\S+_swap$/) {
4200             $cmdlist .= "destroy $chain\n";
4201         }
4202     }
4203
4204     foreach my $chain (keys %$ruleset) {
4205         my $stat = $statushash->{$chain};
4206         die "internal error" if !$stat;
4207
4208         if ($stat->{action} eq 'create') {
4209             foreach my $cmd (@{$ruleset->{$chain}}) {
4210                 $cmdlist .= "$cmd\n";
4211             }
4212         }
4213     }
4214
4215     foreach my $chain (keys %$ruleset) {
4216         my $stat = $statushash->{$chain};
4217         die "internal error" if !$stat;
4218
4219         if ($stat->{action} eq 'update') {
4220             my $chain_swap = $chain."_swap";
4221
4222             foreach my $cmd (@{$ruleset->{$chain}}) {
4223                 $cmd =~ s/$chain/$chain_swap/;
4224                 $cmdlist .= "$cmd\n";
4225             }
4226             $cmdlist .= "swap $chain_swap $chain\n";
4227             $cmdlist .= "flush $chain_swap\n";
4228             $cmdlist .= "destroy $chain_swap\n";
4229         }
4230     }
4231
4232      # the remove unused chains
4233     foreach my $chain (keys %$statushash) {
4234         next if $statushash->{$chain}->{action} ne 'delete';
4235
4236         $delete_cmdlist .= "flush $chain\n";
4237         $delete_cmdlist .= "destroy $chain\n";
4238     }
4239
4240     my $changes = ($cmdlist || $delete_cmdlist) ? 1 : 0;
4241
4242     return ($cmdlist, $delete_cmdlist, $changes);
4243 }
4244
4245 sub apply_ruleset {
4246     my ($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $ebtables_ruleset) = @_;
4247
4248     enable_bridge_firewall();
4249
4250     my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
4251         get_ipset_cmdlist($ipset_ruleset);
4252
4253     my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset->{filter});
4254     my ($cmdlistv6, $changesv6) = get_ruleset_cmdlist($rulesetv6->{filter}, "ip6tables");
4255     my ($ebtables_cmdlist, $ebtables_changes) = get_ebtables_cmdlist($ebtables_ruleset);
4256     my ($cmdlist_raw, $changes_raw) = get_ruleset_cmdlist($ruleset->{raw}, undef, 'raw');
4257     my ($cmdlistv6_raw, $changesv6_raw) = get_ruleset_cmdlist($rulesetv6->{raw}, "ip6tables", 'raw');
4258
4259     if ($verbose) {
4260         if ($ipset_changes) {
4261             print "ipset changes:\n";
4262             print $ipset_create_cmdlist if $ipset_create_cmdlist;
4263             print $ipset_delete_cmdlist if $ipset_delete_cmdlist;
4264         }
4265
4266         if ($changes) {
4267             print "iptables changes:\n";
4268             print $cmdlist;
4269         }
4270
4271         if ($changesv6) {
4272             print "ip6tables changes:\n";
4273             print $cmdlistv6;
4274         }
4275
4276         if ($changes_raw) {
4277             print "iptables table raw changes:\n";
4278             print $cmdlist_raw;
4279         }
4280
4281         if ($changesv6_raw) {
4282             print "ip6tables table raw changes:\n";
4283             print $cmdlistv6_raw;
4284         }
4285
4286         if ($ebtables_changes) {
4287             print "ebtables changes:\n";
4288             print $ebtables_cmdlist;
4289         }
4290     }
4291
4292     my $tmpfile = "$pve_fw_status_dir/ipsetcmdlist1";
4293     PVE::Tools::file_set_contents($tmpfile, $ipset_create_cmdlist || '');
4294
4295     ipset_restore_cmdlist($ipset_create_cmdlist);
4296
4297     $tmpfile = "$pve_fw_status_dir/ip4cmdlist";
4298     PVE::Tools::file_set_contents($tmpfile, $cmdlist || '');
4299
4300     iptables_restore_cmdlist($cmdlist);
4301
4302     $tmpfile = "$pve_fw_status_dir/ip4cmdlistraw";
4303     PVE::Tools::file_set_contents($tmpfile, $cmdlist_raw || '');
4304
4305     iptables_restore_cmdlist($cmdlist_raw, 'raw');
4306
4307     $tmpfile = "$pve_fw_status_dir/ip6cmdlist";
4308     PVE::Tools::file_set_contents($tmpfile, $cmdlistv6 || '');
4309
4310     ip6tables_restore_cmdlist($cmdlistv6);
4311
4312     $tmpfile = "$pve_fw_status_dir/ip6cmdlistraw";
4313     PVE::Tools::file_set_contents($tmpfile, $cmdlistv6_raw || '');
4314
4315     ip6tables_restore_cmdlist($cmdlistv6_raw, 'raw');
4316
4317     $tmpfile = "$pve_fw_status_dir/ipsetcmdlist2";
4318     PVE::Tools::file_set_contents($tmpfile, $ipset_delete_cmdlist || '');
4319
4320     ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
4321
4322     ebtables_restore_cmdlist($ebtables_cmdlist);
4323
4324     $tmpfile = "$pve_fw_status_dir/ebtablescmdlist";
4325     PVE::Tools::file_set_contents($tmpfile, $ebtables_cmdlist || '');
4326
4327     # test: re-read status and check if everything is up to date
4328     my $ruleset_filter = $ruleset->{filter};
4329     my $active_chains = iptables_get_chains();
4330     my $statushash = get_ruleset_status($ruleset_filter, $active_chains, \&iptables_chain_digest);
4331
4332     my $errors;
4333     foreach my $chain (sort keys %$ruleset_filter) {
4334         my $stat = $statushash->{$chain};
4335         if ($stat->{action} ne 'exists') {
4336             warn "unable to update chain '$chain'\n";
4337             $errors = 1;
4338         }
4339     }
4340
4341     my $rulesetv6_filter = $rulesetv6->{filter};
4342     my $active_chainsv6 = iptables_get_chains("ip6tables");
4343     my $statushashv6 = get_ruleset_status($rulesetv6_filter, $active_chainsv6, \&iptables_chain_digest);
4344
4345     foreach my $chain (sort keys %$rulesetv6_filter) {
4346         my $stat = $statushashv6->{$chain};
4347         if ($stat->{action} ne 'exists') {
4348             warn "unable to update chain '$chain'\n";
4349             $errors = 1;
4350         }
4351     }
4352
4353     my $ruleset_raw = $ruleset->{raw};
4354     my $active_chains_raw = iptables_get_chains(undef, 'raw');
4355     my $statushash_raw = get_ruleset_status($ruleset_raw, $active_chains_raw, \&iptables_chain_digest);
4356
4357     foreach my $chain (sort keys %$ruleset_raw) {
4358         my $stat = $statushash_raw->{$chain};
4359         if ($stat->{action} ne 'exists') {
4360             warn "unable to update chain '$chain'\n";
4361             $errors = 1;
4362         }
4363     }
4364
4365     my $rulesetv6_raw = $rulesetv6->{raw};
4366     my $active_chainsv6_raw = iptables_get_chains("ip6tables", 'raw');
4367     my $statushashv6_raw = get_ruleset_status($rulesetv6_raw, $active_chainsv6_raw, \&iptables_chain_digest);
4368
4369     foreach my $chain (sort keys %$rulesetv6_raw) {
4370         my $stat = $statushashv6_raw->{$chain};
4371         if ($stat->{action} ne 'exists') {
4372             warn "unable to update chain '$chain'\n";
4373             $errors = 1;
4374         }
4375     }
4376
4377     my $active_ebtables_chains = ebtables_get_chains();
4378     my $ebtables_statushash = get_ruleset_status($ebtables_ruleset,
4379                                 $active_ebtables_chains, \&iptables_chain_digest,
4380                                 $pve_ebtables_chainname_regex);
4381
4382     foreach my $chain (sort keys %$ebtables_ruleset) {
4383         my $stat = $ebtables_statushash->{$chain};
4384         if ($stat->{action} ne 'exists') {
4385             warn "ebtables : unable to update chain '$chain'\n";
4386             $errors = 1;
4387         }
4388     }
4389
4390     die "unable to apply firewall changes\n" if $errors;
4391
4392     update_nf_conntrack_max($hostfw_conf);
4393
4394     update_nf_conntrack_tcp_timeout_established($hostfw_conf);
4395
4396     update_nf_conntrack_tcp_timeout_syn_recv($hostfw_conf);
4397
4398     update_nf_conntrack_logging($hostfw_conf);
4399 }
4400
4401 sub update_nf_conntrack_max {
4402     my ($hostfw_conf) = @_;
4403
4404     my $max = 262144; # reasonable default (2^16 * 4), see nf_conntrack-sysctl docs
4405
4406     my $options = $hostfw_conf->{options} || {};
4407
4408     if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
4409         $max = $options->{nf_conntrack_max};
4410         $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
4411     }
4412
4413     my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
4414     my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
4415
4416     my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
4417
4418     if ($current != $max) {
4419         my $hashsize = int($max/4);
4420         PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
4421         PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
4422     }
4423 }
4424
4425 sub update_nf_conntrack_tcp_timeout_established {
4426     my ($hostfw_conf) = @_;
4427
4428     my $options = $hostfw_conf->{options} || {};
4429
4430     my $value = defined($options->{nf_conntrack_tcp_timeout_established}) ? $options->{nf_conntrack_tcp_timeout_established} : 432000;
4431
4432     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established", $value);
4433 }
4434
4435 sub update_nf_conntrack_tcp_timeout_syn_recv {
4436     my ($hostfw_conf) = @_;
4437
4438     my $options = $hostfw_conf->{options} || {};
4439
4440     my $value = defined($options->{nf_conntrack_tcp_timeout_syn_recv}) ? $options->{nf_conntrack_tcp_timeout_syn_recev} : 60;
4441
4442     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_syn_recv", $value);
4443 }
4444
4445 my $log_nf_conntrack_enabled = undef;
4446 sub update_nf_conntrack_logging {
4447     my ($hostfw_conf) = @_;
4448
4449     my $options = $hostfw_conf->{options} || {};
4450     my $value = $options->{log_nf_conntrack} || 0;
4451     if (!defined($log_nf_conntrack_enabled)
4452         || $value != $log_nf_conntrack_enabled)
4453     {
4454         my $tmpfile = "$pve_fw_status_dir/log_nf_conntrack";
4455         PVE::Tools::file_set_contents($tmpfile, $value);
4456
4457         run_command([qw(systemctl try-reload-or-restart pvefw-logger.service)]);
4458         $log_nf_conntrack_enabled = $value;
4459     }
4460 }
4461
4462 sub remove_pvefw_chains {
4463
4464     PVE::Firewall::remove_pvefw_chains_iptables("iptables");
4465     PVE::Firewall::remove_pvefw_chains_iptables("ip6tables");
4466     PVE::Firewall::remove_pvefw_chains_iptables("iptables", "raw");
4467     PVE::Firewall::remove_pvefw_chains_iptables("ip6tables", "raw");
4468     PVE::Firewall::remove_pvefw_chains_ipset();
4469     PVE::Firewall::remove_pvefw_chains_ebtables();
4470
4471 }
4472
4473 sub remove_pvefw_chains_iptables {
4474     my ($iptablescmd, $table) = @_;
4475
4476     $table = 'filter' if !$table;
4477
4478     my ($chash, $hooks) = iptables_get_chains($iptablescmd, $table);
4479     my $cmdlist = "*$table\n";
4480
4481     foreach my $h (qw(INPUT OUTPUT FORWARD PREROUTING)) {
4482         if ($hooks->{$h}) {
4483             $cmdlist .= "-D $h -j PVEFW-$h\n";
4484         }
4485     }
4486
4487     foreach my $chain (keys %$chash) {
4488         $cmdlist .= "-F $chain\n";
4489     }
4490
4491     foreach my $chain (keys %$chash) {
4492         $cmdlist .= "-X $chain\n";
4493     }
4494     $cmdlist .= "COMMIT\n";
4495
4496     if($iptablescmd eq "ip6tables") {
4497         ip6tables_restore_cmdlist($cmdlist, $table);
4498     } else {
4499         iptables_restore_cmdlist($cmdlist, $table);
4500     }
4501 }
4502
4503 sub remove_pvefw_chains_ipset {
4504
4505     my $ipset_chains = ipset_get_chains();
4506
4507     my $cmdlist = "";
4508
4509     foreach my $chain (keys %$ipset_chains) {
4510         $cmdlist .= "flush $chain\n";
4511         $cmdlist .= "destroy $chain\n";
4512     }
4513
4514     ipset_restore_cmdlist($cmdlist) if $cmdlist;
4515 }
4516
4517 sub remove_pvefw_chains_ebtables {
4518     # apply empty ruleset = remove all our chains
4519     ebtables_restore_cmdlist(get_ebtables_cmdlist({}));
4520 }
4521
4522 sub init {
4523     my $cluster_conf = load_clusterfw_conf();
4524     my $cluster_options = $cluster_conf->{options};
4525     my $enable = $cluster_options->{enable};
4526
4527     return if !$enable;
4528
4529     # load required modules here
4530 }
4531
4532 sub update {
4533     my $code = sub {
4534
4535         my $cluster_conf = load_clusterfw_conf();
4536         my $cluster_options = $cluster_conf->{options};
4537
4538         if (!$cluster_options->{enable}) {
4539             PVE::Firewall::remove_pvefw_chains();
4540             return;
4541         }
4542
4543         my $hostfw_conf = load_hostfw_conf($cluster_conf);
4544
4545         my ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset) = compile($cluster_conf, $hostfw_conf);
4546
4547         apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
4548     };
4549
4550     run_locked($code);
4551 }
4552
4553 1;