src/PVE/Firewall.pm

   1 package PVE::Firewall;
   2
   3 use warnings;
   4 use strict;
   5
   6 use Digest::SHA;
   7 use Encode;
   8 use File::Basename;
   9 use File::Path;
  10 use IO::File;
  11 use Net::IP;
  12 use POSIX;
  13 use Socket qw(AF_INET AF_INET6 inet_ntop inet_pton);
  14 use Storable qw(dclone);
  15
  16 use PVE::Cluster;
  17 use PVE::Corosync;
  18 use PVE::Exception qw(raise raise_param_exc);
  19 use PVE::INotify;
  20 use PVE::JSONSchema qw(register_standard_option get_standard_option);
  21 use PVE::Network;
  22 use PVE::ProcFSTools;
  23 use PVE::SafeSyslog;
  24 use PVE::Tools qw($IPV4RE $IPV6RE);
  25 use PVE::Tools qw(run_command lock_file dir_glob_foreach);
  26
  27 my $pvefw_conf_dir = "/etc/pve/firewall";
  28 my $clusterfw_conf_filename = "$pvefw_conf_dir/cluster.fw";
  29
  30 # dynamically include PVE::QemuServer and PVE::LXC
  31 # to avoid dependency problems
  32 my $have_qemu_server;
  33 eval {
  34     require PVE::QemuServer;
  35     require PVE::QemuConfig;
  36     $have_qemu_server = 1;
  37 };
  38
  39 my $have_lxc;
  40 eval {
  41     require PVE::LXC;
  42     $have_lxc = 1;
  43 };
  44
  45 my $pve_fw_status_dir = "/var/lib/pve-firewall";
  46
  47 mkdir $pve_fw_status_dir; # make sure this exists
  48
  49 my $security_group_name_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  50 my $ipset_name_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  51 our $ip_alias_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  52
  53 my $max_alias_name_length = 64;
  54 my $max_ipset_name_length = 64;
  55 my $max_group_name_length = 18;
  56
  57 my $PROTOCOLS_WITH_PORTS = {
  58     udp => 1,     17 => 1,
  59     udplite => 1, 136 => 1,
  60     tcp => 1,     6 => 1,
  61     dccp => 1,    33 => 1,
  62     sctp => 1,    132 => 1,
  63 };
  64
  65 PVE::JSONSchema::register_format('IPorCIDR', \&pve_verify_ip_or_cidr);
  66 sub pve_verify_ip_or_cidr {
  67     my ($cidr, $noerr) = @_;
  68
  69     if ($cidr =~ m!^(?:$IPV6RE|$IPV4RE)(/(\d+))?$!) {
  70         return $cidr if Net::IP->new($cidr);
  71         return undef if $noerr;
  72         die Net::IP::Error() . "\n";
  73     }
  74     return undef if $noerr;
  75     die "value does not look like a valid IP address or CIDR network\n";
  76 }
  77
  78 PVE::JSONSchema::register_format('IPorCIDRorAlias', \&pve_verify_ip_or_cidr_or_alias);
  79 sub pve_verify_ip_or_cidr_or_alias {
  80     my ($cidr, $noerr) = @_;
  81
  82     return if $cidr =~ m/^(?:$ip_alias_pattern)$/;
  83
  84     return pve_verify_ip_or_cidr($cidr, $noerr);
  85 }
  86
  87 PVE::JSONSchema::register_standard_option('ipset-name', {
  88     description => "IP set name.",
  89     type => 'string',
  90     pattern => $ipset_name_pattern,
  91     minLength => 2,
  92     maxLength => $max_ipset_name_length,
  93 });
  94
  95 PVE::JSONSchema::register_standard_option('pve-fw-alias', {
  96     description => "Alias name.",
  97     type => 'string',
  98     pattern => $ip_alias_pattern,
  99     minLength => 2,
 100     maxLength => $max_alias_name_length,
 101 });
 102
 103 PVE::JSONSchema::register_standard_option('pve-fw-loglevel' => {
 104     description => "Log level.",
 105     type => 'string',
 106     enum => ['emerg', 'alert', 'crit', 'err', 'warning', 'notice', 'info', 'debug', 'nolog'],
 107     optional => 1,
 108 });
 109
 110 PVE::JSONSchema::register_standard_option('pve-security-group-name', {
 111     description => "Security Group name.",
 112     type => 'string',
 113     pattern => $security_group_name_pattern,
 114     minLength => 2,
 115     maxLength => $max_group_name_length,
 116 });
 117
 118 my $feature_ipset_nomatch = 0;
 119 eval  {
 120     my (undef, undef, $release) = POSIX::uname();
 121     if ($release =~ m/^(\d+)\.(\d+)\.\d+-/) {
 122         my ($major, $minor) = ($1, $2);
 123         $feature_ipset_nomatch = 1 if ($major > 3) ||
 124             ($major == 3 && $minor >= 7);
 125     }
 126
 127 };
 128
 129 my $nodename = PVE::INotify::nodename();
 130 my $hostfw_conf_filename = "/etc/pve/nodes/$nodename/host.fw";
 131
 132 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
 133
 134 my $default_log_level = 'nolog'; # avoid logs by default
 135 my $global_log_ratelimit = '--limit 1/sec';
 136
 137 my $log_level_hash = {
 138     debug => 7,
 139     info => 6,
 140     notice => 5,
 141     warning => 4,
 142     err => 3,
 143     crit => 2,
 144     alert => 1,
 145     emerg => 0,
 146 };
 147
 148 my $verbose = 0;
 149 sub set_verbose {
 150     $verbose = shift;
 151 }
 152
 153 # %rule
 154 #
 155 # name => optional
 156 # enable => [0|1]
 157 # action =>
 158 # proto =>
 159 # sport => port[,port[,port]].. or port:port
 160 # dport => port[,port[,port]].. or port:port
 161 # log => optional, loglevel
 162 # logmsg => optional, logmsg - overwrites default
 163 # iface_in => incomin interface
 164 # iface_out => outgoing interface
 165 # match => optional, overwrites generation of match
 166 # target => optional, overwrites action
 167
 168 # we need to overwrite some macros for ipv6
 169 my $pve_ipv6fw_macros = {
 170     'Ping' => [
 171         { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
 172     ],
 173     'NeighborDiscovery' => [
 174         "IPv6 neighbor solicitation, neighbor and router advertisement",
 175         { action => 'PARAM', proto => 'icmpv6', dport => 'router-solicitation' },
 176         { action => 'PARAM', proto => 'icmpv6', dport => 'router-advertisement' },
 177         { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-solicitation' },
 178         { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-advertisement' },
 179     ],
 180     'DHCPv6' => [
 181         "DHCPv6 traffic",
 182         { action => 'PARAM', proto => 'udp', dport => '546:547', sport => '546:547' },
 183     ],
 184     'Trcrt' => [
 185         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 186         { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
 187     ],
 188  };
 189
 190 # imported/converted from: /usr/share/shorewall/macro.*
 191 my $pve_fw_macros = {
 192     'Amanda' => [
 193         "Amanda Backup",
 194         { action => 'PARAM', proto => 'udp', dport => '10080' },
 195         { action => 'PARAM', proto => 'tcp', dport => '10080' },
 196     ],
 197     'Auth' => [
 198         "Auth (identd) traffic",
 199         { action => 'PARAM', proto => 'tcp', dport => '113' },
 200     ],
 201     'BGP' => [
 202         "Border Gateway Protocol traffic",
 203         { action => 'PARAM', proto => 'tcp', dport => '179' },
 204     ],
 205     'BitTorrent' => [
 206         "BitTorrent traffic for BitTorrent 3.1 and earlier",
 207         { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
 208         { action => 'PARAM', proto => 'udp', dport => '6881' },
 209     ],
 210     'BitTorrent32' => [
 211         "BitTorrent traffic for BitTorrent 3.2 and later",
 212         { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
 213         { action => 'PARAM', proto => 'udp', dport => '6881' },
 214     ],
 215     'Ceph' => [
 216         "Ceph Storage Cluster traffic (Ceph Monitors, OSD & MDS Deamons)",
 217         # Legacy port for protocol v1
 218         { action => 'PARAM', proto => 'tcp', dport => '6789' },
 219         # New port for protocol v2
 220         { action => 'PARAM', proto => 'tcp', dport => '3300' },
 221         { action => 'PARAM', proto => 'tcp', dport => '6800:7300' },
 222     ],
 223     'CVS' => [
 224         "Concurrent Versions System pserver traffic",
 225         { action => 'PARAM', proto => 'tcp', dport => '2401' },
 226     ],
 227     'Citrix' => [
 228         "Citrix/ICA traffic (ICA, ICA Browser, CGP)",
 229         { action => 'PARAM', proto => 'tcp', dport => '1494' },
 230         { action => 'PARAM', proto => 'udp', dport => '1604' },
 231         { action => 'PARAM', proto => 'tcp', dport => '2598' },
 232     ],
 233     'DAAP' => [
 234         "Digital Audio Access Protocol traffic (iTunes, Rythmbox daemons)",
 235         { action => 'PARAM', proto => 'tcp', dport => '3689' },
 236         { action => 'PARAM', proto => 'udp', dport => '3689' },
 237     ],
 238     'DCC' => [
 239         "Distributed Checksum Clearinghouse spam filtering mechanism",
 240         { action => 'PARAM', proto => 'tcp', dport => '6277' },
 241     ],
 242     'DHCPfwd' => [
 243         "Forwarded DHCP traffic",
 244         { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
 245     ],
 246     'DNS' => [
 247         "Domain Name System traffic (upd and tcp)",
 248         { action => 'PARAM', proto => 'udp', dport => '53' },
 249         { action => 'PARAM', proto => 'tcp', dport => '53' },
 250     ],
 251     'Distcc' => [
 252         "Distributed Compiler service",
 253         { action => 'PARAM', proto => 'tcp', dport => '3632' },
 254     ],
 255     'FTP' => [
 256         "File Transfer Protocol",
 257         { action => 'PARAM', proto => 'tcp', dport => '21' },
 258     ],
 259     'Finger' => [
 260         "Finger protocol (RFC 742)",
 261         { action => 'PARAM', proto => 'tcp', dport => '79' },
 262     ],
 263     'GNUnet' => [
 264         "GNUnet secure peer-to-peer networking traffic",
 265         { action => 'PARAM', proto => 'tcp', dport => '2086' },
 266         { action => 'PARAM', proto => 'udp', dport => '2086' },
 267         { action => 'PARAM', proto => 'tcp', dport => '1080' },
 268         { action => 'PARAM', proto => 'udp', dport => '1080' },
 269     ],
 270     'GRE' => [
 271         "Generic Routing Encapsulation tunneling protocol",
 272         { action => 'PARAM', proto => '47' },
 273     ],
 274     'Git' => [
 275         "Git distributed revision control traffic",
 276         { action => 'PARAM', proto => 'tcp', dport => '9418' },
 277     ],
 278     'HKP' => [
 279         "OpenPGP HTTP keyserver protocol traffic",
 280         { action => 'PARAM', proto => 'tcp', dport => '11371' },
 281     ],
 282     'HTTP' => [
 283         "Hypertext Transfer Protocol (WWW)",
 284         { action => 'PARAM', proto => 'tcp', dport => '80' },
 285     ],
 286     'HTTPS' => [
 287         "Hypertext Transfer Protocol (WWW) over SSL",
 288         { action => 'PARAM', proto => 'tcp', dport => '443' },
 289     ],
 290     'ICPV2' => [
 291         "Internet Cache Protocol V2 (Squid) traffic",
 292         { action => 'PARAM', proto => 'udp', dport => '3130' },
 293     ],
 294     'ICQ' => [
 295         "AOL Instant Messenger traffic",
 296         { action => 'PARAM', proto => 'tcp', dport => '5190' },
 297     ],
 298     'IMAP' => [
 299         "Internet Message Access Protocol",
 300         { action => 'PARAM', proto => 'tcp', dport => '143' },
 301     ],
 302     'IMAPS' => [
 303         "Internet Message Access Protocol over SSL",
 304         { action => 'PARAM', proto => 'tcp', dport => '993' },
 305     ],
 306     'IPIP' => [
 307         "IPIP capsulation traffic",
 308         { action => 'PARAM', proto => '94' },
 309     ],
 310     'IPsec' => [
 311         "IPsec traffic",
 312         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 313         { action => 'PARAM', proto => '50' },
 314     ],
 315     'IPsecah' => [
 316         "IPsec authentication (AH) traffic",
 317         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 318         { action => 'PARAM', proto => '51' },
 319     ],
 320     'IPsecnat' => [
 321         "IPsec traffic and Nat-Traversal",
 322         { action => 'PARAM', proto => 'udp', dport => '500' },
 323         { action => 'PARAM', proto => 'udp', dport => '4500' },
 324         { action => 'PARAM', proto => '50' },
 325     ],
 326     'IRC' => [
 327         "Internet Relay Chat traffic",
 328         { action => 'PARAM', proto => 'tcp', dport => '6667' },
 329     ],
 330     'Jetdirect' => [
 331         "HP Jetdirect printing",
 332         { action => 'PARAM', proto => 'tcp', dport => '9100' },
 333     ],
 334     'L2TP' => [
 335         "Layer 2 Tunneling Protocol traffic",
 336         { action => 'PARAM', proto => 'udp', dport => '1701' },
 337     ],
 338     'LDAP' => [
 339         "Lightweight Directory Access Protocol traffic",
 340         { action => 'PARAM', proto => 'tcp', dport => '389' },
 341     ],
 342     'LDAPS' => [
 343         "Secure Lightweight Directory Access Protocol traffic",
 344         { action => 'PARAM', proto => 'tcp', dport => '636' },
 345     ],
 346     'MSNP' => [
 347         "Microsoft Notification Protocol",
 348         { action => 'PARAM', proto => 'tcp', dport => '1863' },
 349     ],
 350     'MSSQL' => [
 351         "Microsoft SQL Server",
 352         { action => 'PARAM', proto => 'tcp', dport => '1433' },
 353     ],
 354     'Mail' => [
 355         "Mail traffic (SMTP, SMTPS, Submission)",
 356         { action => 'PARAM', proto => 'tcp', dport => '25' },
 357         { action => 'PARAM', proto => 'tcp', dport => '465' },
 358         { action => 'PARAM', proto => 'tcp', dport => '587' },
 359     ],
 360     'MDNS' => [
 361         "Multicast DNS",
 362         { action => 'PARAM', proto => 'udp', dport => '5353' },
 363     ],
 364     'Munin' => [
 365         "Munin networked resource monitoring traffic",
 366         { action => 'PARAM', proto => 'tcp', dport => '4949' },
 367     ],
 368     'MySQL' => [
 369         "MySQL server",
 370         { action => 'PARAM', proto => 'tcp', dport => '3306' },
 371     ],
 372     'NNTP' => [
 373         "NNTP traffic (Usenet).",
 374         { action => 'PARAM', proto => 'tcp', dport => '119' },
 375     ],
 376     'NNTPS' => [
 377         "Encrypted NNTP traffic (Usenet)",
 378         { action => 'PARAM', proto => 'tcp', dport => '563' },
 379     ],
 380     'NTP' => [
 381         "Network Time Protocol (ntpd)",
 382         { action => 'PARAM', proto => 'udp', dport => '123' },
 383     ],
 384     'OSPF' => [
 385         "OSPF multicast traffic",
 386         { action => 'PARAM', proto => '89' },
 387     ],
 388     'OpenVPN' => [
 389         "OpenVPN traffic",
 390         { action => 'PARAM', proto => 'udp', dport => '1194' },
 391     ],
 392     'PCA' => [
 393         "Symantec PCAnywere (tm)",
 394         { action => 'PARAM', proto => 'udp', dport => '5632' },
 395         { action => 'PARAM', proto => 'tcp', dport => '5631' },
 396     ],
 397     'PMG' => [
 398         "Proxmox Mail Gateway web interface",
 399         { action => 'PARAM', proto => 'tcp', dport => '8006' },
 400     ],
 401     'POP3' => [
 402         "POP3 traffic",
 403         { action => 'PARAM', proto => 'tcp', dport => '110' },
 404     ],
 405     'POP3S' => [
 406         "Encrypted POP3 traffic",
 407         { action => 'PARAM', proto => 'tcp', dport => '995' },
 408     ],
 409     'PPtP' => [
 410         "Point-to-Point Tunneling Protocol",
 411         { action => 'PARAM', proto => '47' },
 412         { action => 'PARAM', proto => 'tcp', dport => '1723' },
 413     ],
 414     'Ping' => [
 415         "ICMP echo request",
 416         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 417     ],
 418     'PostgreSQL' => [
 419         "PostgreSQL server",
 420         { action => 'PARAM', proto => 'tcp', dport => '5432' },
 421     ],
 422     'Printer' => [
 423         "Line Printer protocol printing",
 424         { action => 'PARAM', proto => 'tcp', dport => '515' },
 425     ],
 426     'RDP' => [
 427         "Microsoft Remote Desktop Protocol traffic",
 428         { action => 'PARAM', proto => 'tcp', dport => '3389' },
 429     ],
 430     'RIP' => [
 431         "Routing Information Protocol (bidirectional)",
 432         { action => 'PARAM', proto => 'udp', dport => '520' },
 433     ],
 434     'RNDC' => [
 435         "BIND remote management protocol",
 436         { action => 'PARAM', proto => 'tcp', dport => '953' },
 437     ],
 438     'Razor' => [
 439         "Razor Antispam System",
 440         { action => 'PARAM', proto => 'tcp', dport => '2703' },
 441     ],
 442     'Rdate' => [
 443         "Remote time retrieval (rdate)",
 444         { action => 'PARAM', proto => 'tcp', dport => '37' },
 445     ],
 446     'Rsync' => [
 447         "Rsync server",
 448         { action => 'PARAM', proto => 'tcp', dport => '873' },
 449     ],
 450     'SANE' => [
 451         "SANE network scanning",
 452         { action => 'PARAM', proto => 'tcp', dport => '6566' },
 453     ],
 454     'SMB' => [
 455         "Microsoft SMB traffic",
 456         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 457         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 458         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 459         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 460     ],
 461     'SMBswat' => [
 462         "Samba Web Administration Tool",
 463         { action => 'PARAM', proto => 'tcp', dport => '901' },
 464     ],
 465     'SMTP' => [
 466         "Simple Mail Transfer Protocol",
 467         { action => 'PARAM', proto => 'tcp', dport => '25' },
 468     ],
 469     'SMTPS' => [
 470         "Encrypted Simple Mail Transfer Protocol",
 471         { action => 'PARAM', proto => 'tcp', dport => '465' },
 472     ],
 473     'SNMP' => [
 474         "Simple Network Management Protocol",
 475         { action => 'PARAM', proto => 'udp', dport => '161:162' },
 476         { action => 'PARAM', proto => 'tcp', dport => '161' },
 477     ],
 478     'SPAMD' => [
 479         "Spam Assassin SPAMD traffic",
 480         { action => 'PARAM', proto => 'tcp', dport => '783' },
 481     ],
 482     'SSH' => [
 483         "Secure shell traffic",
 484         { action => 'PARAM', proto => 'tcp', dport => '22' },
 485     ],
 486     'SVN' => [
 487         "Subversion server (svnserve)",
 488         { action => 'PARAM', proto => 'tcp', dport => '3690' },
 489     ],
 490     'SixXS' => [
 491         "SixXS IPv6 Deployment and Tunnel Broker",
 492         { action => 'PARAM', proto => 'tcp', dport => '3874' },
 493         { action => 'PARAM', proto => 'udp', dport => '3740' },
 494         { action => 'PARAM', proto => '41' },
 495         { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
 496     ],
 497     'Squid' => [
 498         "Squid web proxy traffic",
 499         { action => 'PARAM', proto => 'tcp', dport => '3128' },
 500     ],
 501     'Submission' => [
 502         "Mail message submission traffic",
 503         { action => 'PARAM', proto => 'tcp', dport => '587' },
 504     ],
 505     'Syslog' => [
 506         "Syslog protocol (RFC 5424) traffic",
 507         { action => 'PARAM', proto => 'udp', dport => '514' },
 508         { action => 'PARAM', proto => 'tcp', dport => '514' },
 509     ],
 510     'TFTP' => [
 511         "Trivial File Transfer Protocol traffic",
 512         { action => 'PARAM', proto => 'udp', dport => '69' },
 513     ],
 514     'Telnet' => [
 515         "Telnet traffic",
 516         { action => 'PARAM', proto => 'tcp', dport => '23' },
 517     ],
 518     'Telnets' => [
 519         "Telnet over SSL",
 520         { action => 'PARAM', proto => 'tcp', dport => '992' },
 521     ],
 522     'Time' => [
 523         "RFC 868 Time protocol",
 524         { action => 'PARAM', proto => 'tcp', dport => '37' },
 525     ],
 526     'Trcrt' => [
 527         "Traceroute (for up to 30 hops) traffic",
 528         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 529         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 530     ],
 531     'VNC' => [
 532         "VNC traffic for VNC display's 0 - 99",
 533         { action => 'PARAM', proto => 'tcp', dport => '5900:5999' },
 534     ],
 535     'VNCL' => [
 536         "VNC traffic from Vncservers to Vncviewers in listen mode",
 537         { action => 'PARAM', proto => 'tcp', dport => '5500' },
 538     ],
 539     'Web' => [
 540         "WWW traffic (HTTP and HTTPS)",
 541         { action => 'PARAM', proto => 'tcp', dport => '80' },
 542         { action => 'PARAM', proto => 'tcp', dport => '443' },
 543     ],
 544     'Webcache' => [
 545         "Web Cache/Proxy traffic (port 8080)",
 546         { action => 'PARAM', proto => 'tcp', dport => '8080' },
 547     ],
 548     'Webmin' => [
 549         "Webmin traffic",
 550         { action => 'PARAM', proto => 'tcp', dport => '10000' },
 551     ],
 552     'Whois' => [
 553         "Whois (nicname, RFC 3912) traffic",
 554         { action => 'PARAM', proto => 'tcp', dport => '43' },
 555     ],
 556 };
 557
 558 my $pve_fw_parsed_macros;
 559 my $pve_fw_macro_descr;
 560 my $pve_fw_macro_ipversion = {};
 561 my $pve_fw_preferred_macro_names = {};
 562
 563 my $FWACCEPTMARK_ON  = "0x80000000/0x80000000";
 564 my $FWACCEPTMARK_OFF = "0x00000000/0x80000000";
 565
 566 my $pve_std_chains = {};
 567 my $pve_std_chains_conf = {};
 568 $pve_std_chains_conf->{4} = {
 569     'PVEFW-SET-ACCEPT-MARK' => [
 570         { target => "-j MARK --set-mark $FWACCEPTMARK_ON" },
 571     ],
 572     'PVEFW-DropBroadcast' => [
 573         # same as shorewall 'Broadcast'
 574         # simply DROP BROADCAST/MULTICAST/ANYCAST
 575         # we can use this to reduce logging
 576         { action => 'DROP', dsttype => 'BROADCAST' },
 577         { action => 'DROP', dsttype => 'MULTICAST' },
 578         { action => 'DROP', dsttype => 'ANYCAST' },
 579         { action => 'DROP', dest => '224.0.0.0/4' },
 580     ],
 581     'PVEFW-reject' => [
 582         # same as shorewall 'reject'
 583         { action => 'DROP', dsttype => 'BROADCAST' },
 584         { action => 'DROP', source => '224.0.0.0/4' },
 585         { action => 'DROP', proto => 'icmp' },
 586         { match => '-p tcp', target => '-j REJECT --reject-with tcp-reset' },
 587         { match => '-p udp', target => '-j REJECT --reject-with icmp-port-unreachable' },
 588         { match => '-p icmp', target => '-j REJECT --reject-with icmp-host-unreachable' },
 589         { target => '-j REJECT --reject-with icmp-host-prohibited' },
 590     ],
 591     'PVEFW-Drop' => [
 592         # same as shorewall 'Drop', which is equal to DROP,
 593         # but REJECT/DROP some packages to reduce logging,
 594         # and ACCEPT critical ICMP types
 595         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 596         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 597         { action => 'PVEFW-DropBroadcast' },
 598         # ACCEPT critical ICMP types
 599         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 600         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 601         # Drop packets with INVALID state
 602         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 603         # Drop Microsoft SMB noise
 604         { action => 'DROP', proto => 'udp', dport => '135,445' },
 605         { action => 'DROP', proto => 'udp', dport => '137:139' },
 606         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 607         { action => 'DROP', proto => 'tcp', dport => '135,139,445' },
 608         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 609         # Drop new/NotSyn traffic so that it doesn't get logged
 610         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 611         # Drop DNS replies
 612         { action => 'DROP', proto => 'udp', sport => 53 },
 613     ],
 614     'PVEFW-Reject' => [
 615         # same as shorewall 'Reject', which is equal to Reject,
 616         # but REJECT/DROP some packages to reduce logging,
 617         # and ACCEPT critical ICMP types
 618         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 619         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 620         { action => 'PVEFW-DropBroadcast' },
 621         # ACCEPT critical ICMP types
 622         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 623         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 624         # Drop packets with INVALID state
 625         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 626         # Drop Microsoft SMB noise
 627         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445' },
 628         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
 629         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 630         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445' },
 631         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 632         # Drop new/NotSyn traffic so that it doesn't get logged
 633         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 634         # Drop DNS replies
 635         { action => 'DROP', proto => 'udp', sport => 53 },
 636     ],
 637     'PVEFW-tcpflags' => [
 638         # same as shorewall tcpflags action.
 639         # Packets arriving on this interface are checked for som illegal combinations of TCP flags
 640         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG', target => '-g PVEFW-logflags' },
 641         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE', target => '-g PVEFW-logflags' },
 642         { match => '-p tcp -m tcp --tcp-flags SYN,RST SYN,RST', target => '-g PVEFW-logflags' },
 643         { match => '-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN', target => '-g PVEFW-logflags' },
 644         { match => '-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN', target => '-g PVEFW-logflags' },
 645     ],
 646     'PVEFW-smurfs' => [
 647         # same as shorewall smurfs action
 648         # Filter packets for smurfs (packets with a broadcast address as the source).
 649         { match => '-s 0.0.0.0/32', target => '-j RETURN' }, # allow DHCP
 650         { match => '-m addrtype --src-type BROADCAST', target => '-g PVEFW-smurflog' },
 651         { match => '-s 224.0.0.0/4', target => '-g PVEFW-smurflog' },
 652     ],
 653     'PVEFW-smurflog' => [
 654         { action => 'DROP', logmsg => 'DROP: ' },
 655     ],
 656     'PVEFW-logflags' => [
 657         { action => 'DROP', logmsg => 'DROP: ' },
 658     ],
 659 };
 660
 661 $pve_std_chains_conf->{6} = {
 662     'PVEFW-SET-ACCEPT-MARK' => [
 663         { target => "-j MARK --set-mark $FWACCEPTMARK_ON" },
 664     ],
 665     'PVEFW-DropBroadcast' => [
 666         # same as shorewall 'Broadcast'
 667         # simply DROP BROADCAST/MULTICAST/ANYCAST
 668         # we can use this to reduce logging
 669         #{ action => 'DROP', dsttype => 'BROADCAST' }, #no broadcast in ipv6
 670         # ipv6 addrtype does not work with kernel 2.6.32
 671         #{ action => 'DROP', dsttype => 'MULTICAST' },
 672         #{ action => 'DROP', dsttype => 'ANYCAST' },
 673         { action => 'DROP', dest => 'ff00::/8' },
 674         #{ action => 'DROP', dest => '224.0.0.0/4' },
 675     ],
 676     'PVEFW-reject' => [
 677         { action => 'DROP', proto => 'icmpv6' },
 678         { match => '-p tcp', target => '-j REJECT --reject-with tcp-reset' },
 679         { match => '-p udp', target => '-j REJECT --reject-with icmp6-port-unreachable' },
 680         { target => '-j REJECT --reject-with icmp6-adm-prohibited' },
 681     ],
 682     'PVEFW-Drop' => [
 683         # same as shorewall 'Drop', which is equal to DROP,
 684         # but REJECT/DROP some packages to reduce logging,
 685         # and ACCEPT critical ICMP types
 686         { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
 687         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 688         { action => 'PVEFW-DropBroadcast' },
 689         # ACCEPT critical ICMP types
 690         { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
 691         { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
 692         { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
 693         # Drop packets with INVALID state
 694         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 695         # Drop Microsoft SMB noise
 696         { action => 'DROP', proto => 'udp', dport => '135,445' },
 697         { action => 'DROP', proto => 'udp', dport => '137:139'},
 698         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 699         { action => 'DROP', proto => 'tcp', dport => '135,139,445' },
 700         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 701         # Drop new/NotSyn traffic so that it doesn't get logged
 702         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 703         # Drop DNS replies
 704         { action => 'DROP', proto => 'udp', sport => 53 },
 705     ],
 706     'PVEFW-Reject' => [
 707         # same as shorewall 'Reject', which is equal to Reject,
 708         # but REJECT/DROP some packages to reduce logging,
 709         # and ACCEPT critical ICMP types
 710         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 711         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 712         { action => 'PVEFW-DropBroadcast' },
 713         # ACCEPT critical ICMP types
 714         { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
 715         { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
 716         { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
 717         # Drop packets with INVALID state
 718         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 719         # Drop Microsoft SMB noise
 720         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445' },
 721         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139' },
 722         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 723         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445' },
 724         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 725         # Drop new/NotSyn traffic so that it doesn't get logged
 726         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 727         # Drop DNS replies
 728         { action => 'DROP', proto => 'udp', sport => 53 },
 729     ],
 730     'PVEFW-tcpflags' => [
 731         # same as shorewall tcpflags action.
 732         # Packets arriving on this interface are checked for som illegal combinations of TCP flags
 733         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG', target => '-g PVEFW-logflags' },
 734         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE', target => '-g PVEFW-logflags' },
 735         { match => '-p tcp -m tcp --tcp-flags SYN,RST SYN,RST', target => '-g PVEFW-logflags' },
 736         { match => '-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN', target => '-g PVEFW-logflags' },
 737         { match => '-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN', target => '-g PVEFW-logflags' },
 738     ],
 739     'PVEFW-logflags' => [
 740         { action => 'DROP', logmsg => 'DROP: ' },
 741     ],
 742 };
 743
 744 # iptables -p icmp -h
 745 my $icmp_type_names = {
 746     any => 1,
 747     'echo-reply' => 1,
 748     'destination-unreachable' => 1,
 749     'network-unreachable' => 1,
 750     'host-unreachable' => 1,
 751     'protocol-unreachable' => 1,
 752     'port-unreachable' => 1,
 753     'fragmentation-needed' => 1,
 754     'source-route-failed' => 1,
 755     'network-unknown' => 1,
 756     'host-unknown' => 1,
 757     'network-prohibited' => 1,
 758     'host-prohibited' => 1,
 759     'TOS-network-unreachable' => 1,
 760     'TOS-host-unreachable' => 1,
 761     'communication-prohibited' => 1,
 762     'host-precedence-violation' => 1,
 763     'precedence-cutoff' => 1,
 764     'source-quench' => 1,
 765     'redirect' => 1,
 766     'network-redirect' => 1,
 767     'host-redirect' => 1,
 768     'TOS-network-redirect' => 1,
 769     'TOS-host-redirect' => 1,
 770     'echo-request' => 1,
 771     'router-advertisement' => 1,
 772     'router-solicitation' => 1,
 773     'time-exceeded' => 1,
 774     'ttl-zero-during-transit' => 1,
 775     'ttl-zero-during-reassembly' => 1,
 776     'parameter-problem' => 1,
 777     'ip-header-bad' => 1,
 778     'required-option-missing' => 1,
 779     'timestamp-request' => 1,
 780     'timestamp-reply' => 1,
 781     'address-mask-request' => 1,
 782     'address-mask-reply' => 1,
 783 };
 784
 785 # ip6tables -p icmpv6 -h
 786
 787 my $icmpv6_type_names = {
 788     'any' => 1,
 789     'destination-unreachable' => 1,
 790     'no-route' => 1,
 791     'communication-prohibited' => 1,
 792     'address-unreachable' => 1,
 793     'port-unreachable' => 1,
 794     'packet-too-big' => 1,
 795     'time-exceeded' => 1,
 796     'ttl-zero-during-transit' => 1,
 797     'ttl-zero-during-reassembly' => 1,
 798     'parameter-problem' => 1,
 799     'bad-header' => 1,
 800     'unknown-header-type' => 1,
 801     'unknown-option' => 1,
 802     'echo-request' => 1,
 803     'echo-reply' => 1,
 804     'router-solicitation' => 1,
 805     'router-advertisement' => 1,
 806     'neighbor-solicitation' => 1,
 807     'neighbour-solicitation' => 1,
 808     'neighbor-advertisement' => 1,
 809     'neighbour-advertisement' => 1,
 810     'redirect' => 1,
 811 };
 812
 813 sub init_firewall_macros {
 814
 815     $pve_fw_parsed_macros = {};
 816
 817     my $parse = sub {
 818         my ($k, $macro) = @_;
 819         my $lc_name = lc($k);
 820         $pve_fw_macro_ipversion->{$k} = 0;
 821         while (!ref($macro->[0])) {
 822             my $desc = shift @$macro;
 823             if ($desc eq 'ipv4only') {
 824                 $pve_fw_macro_ipversion->{$k} = 4;
 825             } elsif ($desc eq 'ipv6only') {
 826                 $pve_fw_macro_ipversion->{$k} = 6;
 827             } else {
 828                 $pve_fw_macro_descr->{$k} = $desc;
 829             }
 830         }
 831         $pve_fw_preferred_macro_names->{$lc_name} = $k;
 832         $pve_fw_parsed_macros->{$k} = $macro;
 833     };
 834
 835     foreach my $k (keys %$pve_fw_macros) {
 836         &$parse($k, $pve_fw_macros->{$k});
 837     }
 838
 839     foreach my $k (keys %$pve_ipv6fw_macros) {
 840         next if $pve_fw_parsed_macros->{$k};
 841         &$parse($k, $pve_ipv6fw_macros->{$k});
 842         $pve_fw_macro_ipversion->{$k} = 6;
 843     }
 844 }
 845
 846 init_firewall_macros();
 847
 848 sub get_macros {
 849     return wantarray ? ($pve_fw_parsed_macros, $pve_fw_macro_descr): $pve_fw_parsed_macros;
 850 }
 851
 852 my $etc_services;
 853
 854 sub get_etc_services {
 855
 856     return $etc_services if $etc_services;
 857
 858     my $filename = "/etc/services";
 859
 860     my $fh = IO::File->new($filename, O_RDONLY);
 861     if (!$fh) {
 862         warn "unable to read '$filename' - $!\n";
 863         return {};
 864     }
 865
 866     my $services = {};
 867
 868     while (my $line = <$fh>) {
 869         chomp ($line);
 870         next if $line =~m/^#/;
 871         next if ($line =~m/^\s*$/);
 872
 873         if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp|sctp).*$!) {
 874             $services->{byid}->{$2}->{name} = $1;
 875             $services->{byid}->{$2}->{port} = $2;
 876             $services->{byid}->{$2}->{$3} = 1;
 877             $services->{byname}->{$1} = $services->{byid}->{$2};
 878         }
 879     }
 880
 881     close($fh);
 882
 883     $etc_services = $services;
 884
 885
 886     return $etc_services;
 887 }
 888
 889 sub parse_protocol_file {
 890     my ($filename) = @_;
 891
 892     my $fh = IO::File->new($filename, O_RDONLY);
 893     if (!$fh) {
 894         warn "unable to read '$filename' - $!\n";
 895         return {};
 896     }
 897
 898     my $protocols = {};
 899
 900     while (my $line = <$fh>) {
 901         chomp ($line);
 902         next if $line =~m/^#/;
 903         next if ($line =~m/^\s*$/);
 904
 905         if ($line =~ m!^(\S+)\s+(\d+)(?:\s+.*)?$!) {
 906             $protocols->{byid}->{$2}->{name} = $1;
 907             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
 908         }
 909     }
 910
 911     close($fh);
 912
 913     return $protocols;
 914 }
 915
 916 my $etc_protocols;
 917
 918 sub get_etc_protocols {
 919     return $etc_protocols if $etc_protocols;
 920
 921     my $protocols = parse_protocol_file('/etc/protocols');
 922
 923     # add special case for ICMP v6
 924     $protocols->{byid}->{icmpv6}->{name} = "icmpv6";
 925     $protocols->{byname}->{icmpv6} = $protocols->{byid}->{icmpv6};
 926
 927     $etc_protocols = $protocols;
 928
 929     return $etc_protocols;
 930 }
 931
 932 my $etc_ethertypes;
 933
 934 sub get_etc_ethertypes {
 935     $etc_ethertypes = parse_protocol_file('/etc/ethertypes')
 936         if !$etc_ethertypes;
 937     return $etc_ethertypes;
 938 }
 939
 940 my $__local_network;
 941
 942 sub local_network {
 943     my ($new_value) = @_;
 944
 945     $__local_network = $new_value if defined($new_value);
 946
 947     return $__local_network if defined($__local_network);
 948
 949     eval {
 950         my $nodename = PVE::INotify::nodename();
 951
 952         my $ip = PVE::Cluster::remote_node_ip($nodename);
 953
 954         my $testip = Net::IP->new($ip);
 955
 956         my $isv6 = $testip->version == 6;
 957         my $routes = $isv6 ? PVE::ProcFSTools::read_proc_net_ipv6_route()
 958                            : PVE::ProcFSTools::read_proc_net_route();
 959         foreach my $entry (@$routes) {
 960             my $mask;
 961             if ($isv6) {
 962                 $mask = $entry->{prefix};
 963                 next if !$mask; # skip the default route...
 964             } else {
 965                 $mask = $PVE::Network::ipv4_mask_hash_localnet->{$entry->{mask}};
 966                 next if !defined($mask);
 967             }
 968             my $cidr = "$entry->{dest}/$mask";
 969             my $testnet = Net::IP->new($cidr);
 970             my $overlap = $testnet->overlaps($testip);
 971             if ($overlap == $Net::IP::IP_B_IN_A_OVERLAP ||
 972                 $overlap == $Net::IP::IP_IDENTICAL)
 973             {
 974                 $__local_network = $cidr;
 975                 return;
 976             }
 977         }
 978     };
 979     warn $@ if $@;
 980
 981     return $__local_network;
 982 }
 983
 984 # ipset names are limited to 31 characters,
 985 # and we use '-v4' or '-v6' to indicate IP versions,
 986 # and we use '_swap' suffix for atomic update,
 987 # for example PVEFW-${VMID}-${ipset_name}_swap
 988
 989 my $max_iptables_ipset_name_length = 31 - length("PVEFW-") - length("_swap");
 990
 991 sub compute_ipset_chain_name {
 992     my ($vmid, $ipset_name, $ipversion) = @_;
 993
 994     $vmid = 0 if !defined($vmid);
 995
 996     my $id = "$vmid-${ipset_name}-v$ipversion";
 997
 998     if (length($id) > $max_iptables_ipset_name_length) {
 999         $id = PVE::Tools::fnv31a_hex($id);
1000     }
1001
1002     return "PVEFW-$id";
1003 }
1004
1005 sub compute_ipfilter_ipset_name {
1006     my ($iface) = @_;
1007
1008     return "ipfilter-$iface";
1009 }
1010
1011 sub parse_address_list {
1012     my ($str) = @_;
1013
1014     if ($str =~ m/^(\+)(\S+)$/) { # ipset ref
1015         die "ipset name too long\n" if length($str) > ($max_ipset_name_length + 1);
1016         return;
1017     }
1018
1019     if ($str =~ m/^${ip_alias_pattern}$/) {
1020         die "alias name too long\n" if length($str) > $max_alias_name_length;
1021         return;
1022     }
1023
1024     my $count = 0;
1025     my $iprange = 0;
1026     my $ipversion;
1027
1028     my @elements = split(/,/, $str);
1029     die "extraneous commas in list\n" if $str ne join(',', @elements);
1030     foreach my $elem (@elements) {
1031         $count++;
1032         my $ip = Net::IP->new($elem);
1033         if (!$ip) {
1034             my $err = Net::IP::Error();
1035             die "invalid IP address: $err\n";
1036         }
1037         $iprange = 1 if $elem =~ m/-/;
1038
1039         my $new_ipversion = Net::IP::ip_is_ipv6($ip->ip()) ? 6 : 4;
1040
1041         die "detected mixed ipv4/ipv6 addresses in address list '$str'\n"
1042             if $ipversion && ($new_ipversion != $ipversion);
1043
1044         $ipversion = $new_ipversion;
1045     }
1046
1047     die "you can't use a range in a list\n" if $iprange && $count > 1;
1048
1049     return $ipversion;
1050 }
1051
1052 sub parse_port_name_number_or_range {
1053     my ($str, $dport) = @_;
1054
1055     my $services = PVE::Firewall::get_etc_services();
1056     my $count = 0;
1057     my $icmp_port = 0;
1058
1059     my @elements = split(/,/, $str);
1060     die "extraneous commas in list\n" if $str ne join(',', @elements);
1061     foreach my $item (@elements) {
1062         if ($item =~ m/^([0-9]+):([0-9]+)$/) {
1063             $count += 2;
1064             my ($port1, $port2) = ($1, $2);
1065             die "invalid port '$port1'\n" if $port1 > 65535;
1066             die "invalid port '$port2'\n" if $port2 > 65535;
1067             die "backwards range '$port1:$port2' not allowed, did you mean '$port2:$port1'?\n" if $port1 > $port2;
1068         } elsif ($item =~ m/^([0-9]+)$/) {
1069             $count += 1;
1070             my $port = $1;
1071             die "invalid port '$port'\n" if $port > 65535;
1072         } else {
1073             if ($dport && $icmp_type_names->{$item}) {
1074                 $icmp_port = 1;
1075             } elsif ($dport && $icmpv6_type_names->{$item}) {
1076                 $icmp_port = 1;
1077             } else {
1078                 die "invalid port '$item'\n" if !$services->{byname}->{$item};
1079             }
1080         }
1081     }
1082
1083     die "ICPM ports not allowed in port range\n" if $icmp_port && $count > 0;
1084
1085     # I really don't like to use the word number here, but it's the only thing
1086     # that makes sense in a literal way. The range 1:100 counts as 2, not as
1087     # one and not as 100...
1088     die "too many entries in port list (> 15 numbers)\n"
1089         if $count > 15;
1090
1091     return (scalar(@elements) > 1);
1092 }
1093
1094 PVE::JSONSchema::register_format('pve-fw-sport-spec', \&pve_fw_verify_sport_spec);
1095 sub pve_fw_verify_sport_spec {
1096    my ($portstr) = @_;
1097
1098    parse_port_name_number_or_range($portstr, 0);
1099
1100    return $portstr;
1101 }
1102
1103 PVE::JSONSchema::register_format('pve-fw-dport-spec', \&pve_fw_verify_dport_spec);
1104 sub pve_fw_verify_dport_spec {
1105    my ($portstr) = @_;
1106
1107    parse_port_name_number_or_range($portstr, 1);
1108
1109    return $portstr;
1110 }
1111
1112 PVE::JSONSchema::register_format('pve-fw-addr-spec', \&pve_fw_verify_addr_spec);
1113 sub pve_fw_verify_addr_spec {
1114    my ($list) = @_;
1115
1116    parse_address_list($list);
1117
1118    return $list;
1119 }
1120
1121 PVE::JSONSchema::register_format('pve-fw-protocol-spec', \&pve_fw_verify_protocol_spec);
1122 sub pve_fw_verify_protocol_spec {
1123    my ($proto) = @_;
1124
1125    my $protocols = get_etc_protocols();
1126
1127    die "unknown protocol '$proto'\n" if $proto &&
1128        !(defined($protocols->{byname}->{$proto}) ||
1129          defined($protocols->{byid}->{$proto}));
1130
1131    return $proto;
1132 }
1133
1134
1135 # helper function for API
1136
1137 sub copy_opject_with_digest {
1138     my ($object) = @_;
1139
1140     my $sha = Digest::SHA->new('sha1');
1141
1142     my $res = {};
1143     foreach my $k (sort keys %$object) {
1144         my $v = $object->{$k};
1145         next if !defined($v);
1146         $res->{$k} = $v;
1147         $sha->add($k, ':', $v, "\n");
1148     }
1149
1150     my $digest = $sha->hexdigest;
1151
1152     $res->{digest} = $digest;
1153
1154     return wantarray ? ($res, $digest) : $res;
1155 }
1156
1157 sub copy_list_with_digest {
1158     my ($list) = @_;
1159
1160     my $sha = Digest::SHA->new('sha1');
1161
1162     my $res = [];
1163     foreach my $entry (@$list) {
1164         my $data = {};
1165         foreach my $k (sort keys %$entry) {
1166             my $v = $entry->{$k};
1167             next if !defined($v);
1168             $data->{$k} = $v;
1169             # Note: digest ignores refs ($rule->{errors})
1170             # since Digest::SHA expects a series of bytes,
1171             #  we have to encode the value here to prevent errors when
1172             #  using utf8 characters (eg. in comments)
1173             $sha->add($k, ':', encode_utf8($v), "\n") if !ref($v); ;
1174         }
1175         push @$res, $data;
1176     }
1177
1178     my $digest = $sha->hexdigest;
1179
1180     foreach my $entry (@$res) {
1181         $entry->{digest} = $digest;
1182     }
1183
1184     return wantarray ? ($res, $digest) : $res;
1185 }
1186
1187 our $cluster_option_properties = {
1188     enable => {
1189         description => "Enable or disable the firewall cluster wide.",
1190         type => 'integer',
1191         minimum => 0,
1192         optional => 1,
1193     },
1194     ebtables => {
1195         description => "Enable ebtables rules cluster wide.",
1196         type => 'boolean',
1197         default => 1,
1198         optional => 1,
1199     },
1200     policy_in => {
1201         description => "Input policy.",
1202         type => 'string',
1203         optional => 1,
1204         enum => ['ACCEPT', 'REJECT', 'DROP'],
1205     },
1206     policy_out => {
1207         description => "Output policy.",
1208         type => 'string',
1209         optional => 1,
1210         enum => ['ACCEPT', 'REJECT', 'DROP'],
1211     },
1212     log_ratelimit => {
1213         description => "Log ratelimiting settings",
1214         type => 'string', format => {
1215             enable => {
1216                 default_key => 1,
1217                 description => 'Enable or disable log rate limiting',
1218                 type => 'boolean',
1219                 default => '1',
1220             },
1221             rate => {
1222                 type => 'string',
1223                 description => 'Frequency with which the burst bucket gets refilled',
1224                 optional => 1,
1225                 pattern => '[1-9][0-9]*\/(second|minute|hour|day)',
1226                 format_description => 'rate',
1227                 default => '1/second',
1228             },
1229             burst => {
1230                 type => 'integer',
1231                 minimum => 0,
1232                 optional => 1,
1233                 description => 'Inital burst of packages which will get logged',
1234                 default => 5,
1235             },
1236         },
1237         optional => 1,
1238     },
1239 };
1240
1241 our $host_option_properties = {
1242     enable => {
1243         description => "Enable host firewall rules.",
1244         type => 'boolean',
1245         optional => 1,
1246     },
1247     log_level_in =>  get_standard_option('pve-fw-loglevel', {
1248         description => "Log level for incoming traffic." }),
1249     log_level_out =>  get_standard_option('pve-fw-loglevel', {
1250         description => "Log level for outgoing traffic." }),
1251     tcp_flags_log_level =>  get_standard_option('pve-fw-loglevel', {
1252         description => "Log level for illegal tcp flags filter." }),
1253     smurf_log_level =>  get_standard_option('pve-fw-loglevel', {
1254         description => "Log level for SMURFS filter." }),
1255     nosmurfs => {
1256         description => "Enable SMURFS filter.",
1257         type => 'boolean',
1258         optional => 1,
1259     },
1260     tcpflags => {
1261         description => "Filter illegal combinations of TCP flags.",
1262         type => 'boolean',
1263         default => 0,
1264         optional => 1,
1265     },
1266     nf_conntrack_max => {
1267         description => "Maximum number of tracked connections.",
1268         type => 'integer',
1269         optional => 1,
1270         default => 262144,
1271         minimum => 32768,
1272     },
1273     nf_conntrack_tcp_timeout_established => {
1274         description => "Conntrack established timeout.",
1275         type => 'integer',
1276         optional => 1,
1277         default => 432000,
1278         minimum => 7875,
1279     },
1280     nf_conntrack_tcp_timeout_syn_recv => {
1281         description => "Conntrack syn recv timeout.",
1282         type => 'integer',
1283         optional => 1,
1284         default => 60,
1285         minimum => 30,
1286         maximum => 60,
1287     },
1288     ndp => {
1289         description => "Enable NDP (Neighbor Discovery Protocol).",
1290         type => 'boolean',
1291         default => 0,
1292         optional => 1,
1293     },
1294     nf_conntrack_allow_invalid => {
1295         description => "Allow invalid packets on connection tracking.",
1296         type => 'boolean',
1297         default => 0,
1298         optional => 1,
1299     },
1300     protection_synflood => {
1301         description => "Enable synflood protection",
1302         type => 'boolean',
1303         default => 0,
1304         optional => 1,
1305     },
1306     protection_synflood_rate => {
1307         description => "Synflood protection rate syn/sec by ip src.",
1308         type => 'integer',
1309         optional => 1,
1310         default => 200,
1311     },
1312     protection_synflood_burst => {
1313         description => "Synflood protection rate burst by ip src.",
1314         type => 'integer',
1315         optional => 1,
1316         default => 1000,
1317     },
1318     log_nf_conntrack => {
1319         description => "Enable logging of conntrack information.",
1320         type => 'boolean',
1321         default => 0,
1322         optional => 1
1323     },
1324 };
1325
1326 our $vm_option_properties = {
1327     enable => {
1328         description => "Enable/disable firewall rules.",
1329         type => 'boolean',
1330         default => 0,
1331         optional => 1,
1332     },
1333     macfilter => {
1334         description => "Enable/disable MAC address filter.",
1335         type => 'boolean',
1336         default => 0,
1337         optional => 1,
1338     },
1339     dhcp => {
1340         description => "Enable DHCP.",
1341         type => 'boolean',
1342         default => 0,
1343         optional => 1,
1344     },
1345     ndp => {
1346         description => "Enable NDP (Neighbor Discovery Protocol).",
1347         type => 'boolean',
1348         default => 0,
1349         optional => 1,
1350     },
1351     radv => {
1352         description => "Allow sending Router Advertisement.",
1353         type => 'boolean',
1354         optional => 1,
1355     },
1356     ipfilter => {
1357         description => "Enable default IP filters. " .
1358            "This is equivalent to adding an empty ipfilter-net<id> ipset " .
1359            "for every interface. Such ipsets implicitly contain sane default " .
1360            "restrictions such as restricting IPv6 link local addresses to " .
1361            "the one derived from the interface's MAC address. For containers " .
1362            "the configured IP addresses will be implicitly added.",
1363         type => 'boolean',
1364         optional => 1,
1365     },
1366     policy_in => {
1367         description => "Input policy.",
1368         type => 'string',
1369         optional => 1,
1370         enum => ['ACCEPT', 'REJECT', 'DROP'],
1371     },
1372     policy_out => {
1373         description => "Output policy.",
1374         type => 'string',
1375         optional => 1,
1376         enum => ['ACCEPT', 'REJECT', 'DROP'],
1377     },
1378     log_level_in =>  get_standard_option('pve-fw-loglevel', {
1379         description => "Log level for incoming traffic." }),
1380     log_level_out =>  get_standard_option('pve-fw-loglevel', {
1381         description => "Log level for outgoing traffic." }),
1382
1383 };
1384
1385
1386 my $addr_list_descr = "This can refer to a single IP address, an IP set ('+ipsetname') or an IP alias definition. You can also specify an address range like '20.34.101.207-201.3.9.99', or a list of IP addresses and networks (entries are separated by comma). Please do not mix IPv4 and IPv6 addresses inside such lists.";
1387
1388 my $port_descr = "You can use service names or simple numbers (0-65535), as defined in '/etc/services'. Port ranges can be specified with '\\d+:\\d+', for example '80:85', and you can use comma separated list to match several ports or ranges.";
1389
1390 my $rule_properties = {
1391     pos => {
1392         description => "Update rule at position <pos>.",
1393         type => 'integer',
1394         minimum => 0,
1395         optional => 1,
1396     },
1397     digest => get_standard_option('pve-config-digest'),
1398     type => {
1399         description => "Rule type.",
1400         type => 'string',
1401         optional => 1,
1402         enum => ['in', 'out', 'group'],
1403     },
1404     action => {
1405         description => "Rule action ('ACCEPT', 'DROP', 'REJECT') or security group name.",
1406         type => 'string',
1407         optional => 1,
1408         pattern => $security_group_name_pattern,
1409         maxLength => 20,
1410         minLength => 2,
1411     },
1412     macro => {
1413         description => "Use predefined standard macro.",
1414         type => 'string',
1415         optional => 1,
1416         maxLength => 128,
1417     },
1418     iface => get_standard_option('pve-iface', {
1419         description => "Network interface name. You have to use network configuration key names for VMs and containers ('net\\d+'). Host related rules can use arbitrary strings.",
1420         optional => 1
1421     }),
1422     source => {
1423         description => "Restrict packet source address. $addr_list_descr",
1424         type => 'string', format => 'pve-fw-addr-spec',
1425         optional => 1,
1426     },
1427     dest => {
1428         description => "Restrict packet destination address. $addr_list_descr",
1429         type => 'string', format => 'pve-fw-addr-spec',
1430         optional => 1,
1431     },
1432     proto => {
1433         description => "IP protocol. You can use protocol names ('tcp'/'udp') or simple numbers, as defined in '/etc/protocols'.",
1434         type => 'string', format => 'pve-fw-protocol-spec',
1435         optional => 1,
1436     },
1437     enable => {
1438         description => "Flag to enable/disable a rule.",
1439         type => 'integer',
1440         minimum => 0,
1441         optional => 1,
1442     },
1443     log => get_standard_option('pve-fw-loglevel', {
1444         description => "Log level for firewall rule.",
1445     }),
1446     sport => {
1447         description => "Restrict TCP/UDP source port. $port_descr",
1448         type => 'string', format => 'pve-fw-sport-spec',
1449         optional => 1,
1450     },
1451     dport => {
1452         description => "Restrict TCP/UDP destination port. $port_descr",
1453         type => 'string', format => 'pve-fw-dport-spec',
1454         optional => 1,
1455     },
1456     comment => {
1457         description => "Descriptive comment.",
1458         type => 'string',
1459         optional => 1,
1460     },
1461 };
1462
1463 sub add_rule_properties {
1464     my ($properties) = @_;
1465
1466     foreach my $k (keys %$rule_properties) {
1467         my $h = $rule_properties->{$k};
1468         # copy data, so that we can modify later without side effects
1469         foreach my $opt (keys %$h) { $properties->{$k}->{$opt} = $h->{$opt}; }
1470     }
1471
1472     return $properties;
1473 }
1474
1475 sub delete_rule_properties {
1476     my ($rule, $delete_str) = @_;
1477
1478     foreach my $opt (PVE::Tools::split_list($delete_str)) {
1479         raise_param_exc({ 'delete' => "no such property ('$opt')"})
1480             if !defined($rule_properties->{$opt});
1481         raise_param_exc({ 'delete' => "unable to delete required property '$opt'"})
1482             if $opt eq 'type' || $opt eq 'action';
1483         delete $rule->{$opt};
1484     }
1485
1486     return $rule;
1487 }
1488
1489 my $apply_macro = sub {
1490     my ($macro_name, $param, $verify, $ipversion) = @_;
1491
1492     my $macro_rules = $pve_fw_parsed_macros->{$macro_name};
1493     die "unknown macro '$macro_name'\n" if !$macro_rules; # should not happen
1494
1495     if ($ipversion && ($ipversion == 6) && $pve_ipv6fw_macros->{$macro_name}) {
1496         $macro_rules = $pve_ipv6fw_macros->{$macro_name};
1497     }
1498
1499     # skip macros which are specific to another ipversion
1500     if ($ipversion && (my $required = $pve_fw_macro_ipversion->{$macro_name})) {
1501         return if $ipversion != $required;
1502     }
1503
1504     my $rules = [];
1505
1506     foreach my $templ (@$macro_rules) {
1507         my $rule = {};
1508         my $param_used = {};
1509         foreach my $k (keys %$templ) {
1510             my $v = $templ->{$k};
1511             if ($v eq 'PARAM') {
1512                 $v = $param->{$k};
1513                 $param_used->{$k} = 1;
1514             } elsif ($v eq 'DEST') {
1515                 $v = $param->{dest};
1516                 $param_used->{dest} = 1;
1517             } elsif ($v eq 'SOURCE') {
1518                 $v = $param->{source};
1519                 $param_used->{source} = 1;
1520             }
1521
1522             if (!defined($v)) {
1523                 my $msg = "missing parameter '$k' in macro '$macro_name'";
1524                 raise_param_exc({ macro => $msg }) if $verify;
1525                 die "$msg\n";
1526             }
1527             $rule->{$k} = $v;
1528         }
1529         foreach my $k (keys %$param) {
1530             next if $k eq 'macro';
1531             next if !defined($param->{$k});
1532             next if $param_used->{$k};
1533             if (defined($rule->{$k})) {
1534                 if ($rule->{$k} ne $param->{$k}) {
1535                     my $msg = "parameter '$k' already define in macro (value = '$rule->{$k}')";
1536                     raise_param_exc({ $k => $msg }) if $verify;
1537                     die "$msg\n";
1538                 }
1539             } else {
1540                 $rule->{$k} = $param->{$k};
1541             }
1542         }
1543         push @$rules, $rule;
1544     }
1545
1546     return $rules;
1547 };
1548
1549 my $rule_env_iface_lookup = {
1550     'ct' => 1,
1551     'vm' => 1,
1552     'group' => 0,
1553     'cluster' => 1,
1554     'host' => 1,
1555 };
1556
1557 sub verify_rule {
1558     my ($rule, $cluster_conf, $fw_conf, $rule_env, $noerr) = @_;
1559
1560     my $allow_groups = $rule_env eq 'group' ? 0 : 1;
1561
1562     my $allow_iface = $rule_env_iface_lookup->{$rule_env};
1563     die "unknown rule_env '$rule_env'\n" if !defined($allow_iface); # should not happen
1564
1565     my $errors = $rule->{errors} || {};
1566
1567     my $error_count = 0;
1568
1569     my $add_error = sub {
1570         my ($param, $msg)  = @_;
1571         chomp $msg;
1572         raise_param_exc({ $param => $msg }) if !$noerr;
1573         $error_count++;
1574         $errors->{$param} = $msg if !$errors->{$param};
1575     };
1576
1577     my $ipversion;
1578     my $set_ip_version = sub {
1579         my $vers = shift;
1580         if ($vers) {
1581             die "detected mixed ipv4/ipv6 adresses in rule\n"
1582                 if $ipversion && ($vers != $ipversion);
1583             $ipversion = $vers;
1584         }
1585     };
1586
1587     my $check_ipset_or_alias_property = sub {
1588         my ($name, $expected_ipversion) = @_;
1589
1590         if (my $value = $rule->{$name}) {
1591             if ($value =~ m/^\+/) {
1592                 if ($value =~ m/^\+(${ipset_name_pattern})$/) {
1593                     &$add_error($name, "no such ipset '$1'")
1594                         if !($cluster_conf->{ipset}->{$1} || ($fw_conf && $fw_conf->{ipset}->{$1}));
1595
1596                 } else {
1597                     &$add_error($name, "invalid ipset name '$value'");
1598                 }
1599             } elsif ($value =~ m/^${ip_alias_pattern}$/){
1600                 my $alias = lc($value);
1601                 &$add_error($name, "no such alias '$value'")
1602                     if !($cluster_conf->{aliases}->{$alias} || ($fw_conf && $fw_conf->{aliases}->{$alias}));
1603                 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1604                 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1605
1606                 &$set_ip_version($e->{ipversion});
1607             }
1608         }
1609     };
1610
1611     my $type = $rule->{type};
1612     my $action = $rule->{action};
1613
1614     &$add_error('type', "missing property") if !$type;
1615     &$add_error('action', "missing property") if !$action;
1616
1617     if ($type) {
1618         if ($type eq  'in' || $type eq 'out') {
1619             &$add_error('action', "unknown action '$action'")
1620                 if $action && ($action !~ m/^(ACCEPT|DROP|REJECT)$/);
1621         } elsif ($type eq 'group') {
1622             &$add_error('type', "security groups not allowed")
1623                 if !$allow_groups;
1624             &$add_error('action', "invalid characters in security group name")
1625                 if $action && ($action !~ m/^${security_group_name_pattern}$/);
1626             &$add_error('action', "security group '$action' does not exist")
1627                 if $action && !defined($cluster_conf->{groups}->{$action});
1628         } else {
1629             &$add_error('type', "unknown rule type '$type'");
1630         }
1631     }
1632
1633     if ($rule->{iface}) {
1634         &$add_error('type', "parameter -i not allowed for this rule type")
1635             if !$allow_iface;
1636         eval { PVE::JSONSchema::pve_verify_iface($rule->{iface}); };
1637         &$add_error('iface', $@) if $@;
1638         if ($rule_env eq 'vm' || $rule_env eq 'ct') {
1639             &$add_error('iface', "value does not match the regex pattern 'net\\d+'")
1640                 if $rule->{iface} !~  m/^net(\d+)$/;
1641         }
1642     }
1643
1644     if ($rule->{macro}) {
1645         if (my $preferred_name = $pve_fw_preferred_macro_names->{lc($rule->{macro})}) {
1646             $rule->{macro} = $preferred_name;
1647         } else {
1648             &$add_error('macro', "unknown macro '$rule->{macro}'");
1649         }
1650     }
1651
1652     if ($rule->{proto}) {
1653         eval { pve_fw_verify_protocol_spec($rule->{proto}); };
1654         &$add_error('proto', $@) if $@;
1655         &$set_ip_version(4) if $rule->{proto} eq 'icmp';
1656         &$set_ip_version(6) if $rule->{proto} eq 'icmpv6';
1657     }
1658
1659     if ($rule->{dport}) {
1660         eval { parse_port_name_number_or_range($rule->{dport}, 1); };
1661         &$add_error('dport', $@) if $@;
1662         my $proto = $rule->{proto};
1663         &$add_error('proto', "missing property - 'dport' requires this property")
1664             if !$proto;
1665         &$add_error('dport', "protocol '$proto' does not support ports")
1666             if !$PROTOCOLS_WITH_PORTS->{$proto} &&
1667                 $proto ne 'icmp' && $proto ne 'icmpv6'; # special cases
1668     }
1669
1670     if ($rule->{sport}) {
1671         eval { parse_port_name_number_or_range($rule->{sport}, 0); };
1672         &$add_error('sport', $@) if $@;
1673         my $proto = $rule->{proto};
1674         &$add_error('proto', "missing property - 'sport' requires this property")
1675             if !$proto;
1676         &$add_error('sport', "protocol '$proto' does not support ports")
1677             if !$PROTOCOLS_WITH_PORTS->{$proto};
1678     }
1679
1680     if ($rule->{source}) {
1681         eval {
1682             my $source_ipversion = parse_address_list($rule->{source});
1683             &$set_ip_version($source_ipversion);
1684         };
1685         &$add_error('source', $@) if $@;
1686         &$check_ipset_or_alias_property('source', $ipversion);
1687     }
1688
1689     if ($rule->{dest}) {
1690         eval {
1691             my $dest_ipversion = parse_address_list($rule->{dest});
1692             &$set_ip_version($dest_ipversion);
1693         };
1694         &$add_error('dest', $@) if $@;
1695         &$check_ipset_or_alias_property('dest', $ipversion);
1696     }
1697
1698     $rule->{ipversion} = $ipversion if $ipversion;
1699
1700     if ($rule->{macro} && !$error_count) {
1701         eval { &$apply_macro($rule->{macro}, $rule, 1, $ipversion); };
1702         if (my $err = $@) {
1703             if (ref($err) eq "PVE::Exception" && $err->{errors}) {
1704                 my $eh = $err->{errors};
1705                 foreach my $p (keys %$eh) {
1706                     &$add_error($p, $eh->{$p});
1707                 }
1708             } else {
1709                 &$add_error('macro', "$err");
1710             }
1711         }
1712     }
1713
1714     $rule->{errors} = $errors if $error_count;
1715
1716     return $rule;
1717 }
1718
1719 sub copy_rule_data {
1720     my ($rule, $param) = @_;
1721
1722     foreach my $k (keys %$rule_properties) {
1723         if (defined(my $v = $param->{$k})) {
1724             if ($v eq '' || $v eq '-') {
1725                 delete $rule->{$k};
1726             } else {
1727                 $rule->{$k} = $v;
1728             }
1729         }
1730     }
1731
1732     return $rule;
1733 }
1734
1735 sub rules_modify_permissions {
1736     my ($rule_env) = @_;
1737
1738     if ($rule_env eq 'host') {
1739         return {
1740             check => ['perm', '/nodes/{node}', [ 'Sys.Modify' ]],
1741         };
1742     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1743         return {
1744             check => ['perm', '/', [ 'Sys.Modify' ]],
1745         };
1746     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1747         return {
1748             check => ['perm', '/vms/{vmid}', [ 'VM.Config.Network' ]],
1749         }
1750     }
1751
1752     return undef;
1753 }
1754
1755 sub rules_audit_permissions {
1756     my ($rule_env) = @_;
1757
1758     if ($rule_env eq 'host') {
1759         return {
1760             check => ['perm', '/nodes/{node}', [ 'Sys.Audit' ]],
1761         };
1762     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1763         return {
1764             check => ['perm', '/', [ 'Sys.Audit' ]],
1765         };
1766     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1767         return {
1768             check => ['perm', '/vms/{vmid}', [ 'VM.Audit' ]],
1769         }
1770     }
1771
1772     return undef;
1773 }
1774
1775 # core functions
1776 my $bridge_firewall_enabled = 0;
1777
1778 sub enable_bridge_firewall {
1779
1780     return if $bridge_firewall_enabled; # only once
1781
1782     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
1783     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
1784
1785     # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
1786     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
1787
1788     $bridge_firewall_enabled = 1;
1789 }
1790
1791 sub iptables_restore_cmdlist {
1792     my ($cmdlist, $table) = @_;
1793
1794     $table = 'filter' if !$table;
1795     run_command(['iptables-restore', '-T', $table, '-n'], input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1796 }
1797
1798 sub ip6tables_restore_cmdlist {
1799     my ($cmdlist, $table) = @_;
1800
1801     $table = 'filter' if !$table;
1802     run_command(['ip6tables-restore', '-T', $table, '-n'], input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1803 }
1804
1805 sub ipset_restore_cmdlist {
1806     my ($cmdlist) = @_;
1807
1808     run_command(['ipset', 'restore'], input => $cmdlist, errmsg => "ipset_restore_cmdlist");
1809 }
1810
1811 sub ebtables_restore_cmdlist {
1812     my ($cmdlist) = @_;
1813
1814     run_command(['ebtables-restore'], input => $cmdlist, errmsg => "ebtables_restore_cmdlist");
1815 }
1816
1817 sub iptables_get_chains {
1818     my ($iptablescmd, $t) = @_;
1819
1820     $iptablescmd = "iptables" if !$iptablescmd;
1821     $t = 'filter' if !$t;
1822
1823     my $res = {};
1824
1825     # check what chains we want to track
1826     my $is_pvefw_chain = sub {
1827         my $name = shift;
1828
1829         return 1 if $name =~ m/^PVEFW-\S+$/;
1830
1831         return 1 if $name =~ m/^tap\d+i\d+-(?:IN|OUT)$/;
1832
1833         return 1 if $name =~ m/^veth\d+i\d+-(?:IN|OUT)$/;
1834
1835         return 1 if $name =~ m/^fwbr\d+(v\d+)?-(?:FW|IN|OUT|IPS)$/;
1836         return 1 if $name =~ m/^GROUP-(?:$security_group_name_pattern)-(?:IN|OUT)$/;
1837
1838         return undef;
1839     };
1840
1841     my $table = '';
1842
1843     my $hooks = {};
1844
1845     my $parser = sub {
1846         my $line = shift;
1847
1848         return if $line =~ m/^#/;
1849         return if $line =~ m/^\s*$/;
1850
1851         if ($line =~ m/^\*(\S+)$/) {
1852             $table = $1;
1853             return;
1854         }
1855
1856         return if $table ne $t;
1857
1858         if ($line =~ m/^:(\S+)\s/) {
1859             my $chain = $1;
1860             return if !&$is_pvefw_chain($chain);
1861             $res->{$chain} = "unknown";
1862         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
1863             my ($chain, $sig) = ($1, $2);
1864             return if !&$is_pvefw_chain($chain);
1865             $res->{$chain} = $sig;
1866         } elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD|PREROUTING)\s+-j\s+PVEFW-\1$/) {
1867             $hooks->{$1} = 1;
1868         } else {
1869             # simply ignore the rest
1870             return;
1871         }
1872     };
1873
1874     run_command(["$iptablescmd-save"], outfunc => $parser);
1875
1876     return wantarray ? ($res, $hooks) : $res;
1877 }
1878
1879 sub iptables_chain_digest {
1880     my ($rules) = @_;
1881     my $digest = Digest::SHA->new('sha1');
1882     foreach my $rule (@$rules) { # order is important
1883         $digest->add($rule);
1884     }
1885     return $digest->b64digest;
1886 }
1887
1888 sub ipset_chain_digest {
1889     my ($rules) = @_;
1890
1891     my $digest = Digest::SHA->new('sha1');
1892     foreach my $rule (sort @$rules) { # note: sorted
1893         $digest->add($rule);
1894     }
1895     return $digest->b64digest;
1896 }
1897
1898 sub ipset_get_chains {
1899
1900     my $res = {};
1901     my $chains = {};
1902
1903     my $parser = sub {
1904         my $line = shift;
1905
1906         return if $line =~ m/^#/;
1907         return if $line =~ m/^\s*$/;
1908         if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
1909             my $chain = $1;
1910             $line =~ s/\s+$//; # delete trailing white space
1911             push @{$chains->{$chain}}, $line;
1912         } else {
1913             # simply ignore the rest
1914             return;
1915         }
1916     };
1917
1918     run_command(['ipset', 'save'], outfunc => $parser);
1919
1920     # compute digest for each chain
1921     foreach my $chain (keys %$chains) {
1922         $res->{$chain} = ipset_chain_digest($chains->{$chain});
1923     }
1924
1925     return $res;
1926 }
1927
1928 sub ebtables_get_chains {
1929
1930     my $res = {};
1931     my $chains = {};
1932     my $parser = sub {
1933         my $line = shift;
1934         return if $line =~ m/^#/;
1935         return if $line =~ m/^\s*$/;
1936         if ($line =~ m/^:(\S+)\s\S+$/) {
1937             # Make sure we know chains exist even if they're empty.
1938             $chains->{$1} //= [];
1939         } elsif ($line =~ m/^(?:\S+)\s(\S+)\s(?:\S+).*/) {
1940             my $chain = $1;
1941             $line =~ s/\s+$//;
1942             push @{$chains->{$chain}}, $line;
1943         } else {
1944             # simply ignore the rest
1945             return;
1946         }
1947     };
1948
1949     run_command(['ebtables-save'], outfunc => $parser);
1950     # compute digest for each chain and store rules as well
1951     foreach my $chain (keys %$chains) {
1952         $res->{$chain}->{rules} = $chains->{$chain};
1953         $res->{$chain}->{sig} = iptables_chain_digest($chains->{$chain});
1954     }
1955     return $res;
1956 }
1957
1958 # substitude action of rule according to action hash
1959 sub rule_substitude_action {
1960     my ($rule, $actions) = @_;
1961
1962     if (my $action = $rule->{action}) {
1963         $rule->{action} = $actions->{$action} if defined($actions->{$action});
1964     }
1965 }
1966
1967 # generate a src or dst match
1968 # $dir(ection) is either d or s
1969 sub ipt_gen_src_or_dst_match {
1970     my ($adr, $dir, $ipversion, $cluster_conf, $fw_conf) = @_;
1971
1972     my $srcdst;
1973     if ($dir eq 's') {
1974         $srcdst = "src";
1975     } elsif ($dir eq 'd') {
1976         $srcdst = "dst";
1977     } else {
1978         die "ipt_gen_src_or_dst_match: invalid direction $dir \n";
1979     }
1980
1981     my $match;
1982     if ($adr =~ m/^\+/) {
1983         if ($adr =~ m/^\+(${ipset_name_pattern})$/) {
1984             my $name = $1;
1985             my $ipset_chain;
1986             if ($fw_conf && $fw_conf->{ipset}->{$name}) {
1987                 $ipset_chain = compute_ipset_chain_name($fw_conf->{vmid}, $name, $ipversion);
1988             } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
1989                 $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
1990             } else {
1991                 die "no such ipset '$name'\n";
1992             }
1993             $match = "-m set --match-set ${ipset_chain} ${srcdst}";
1994         } else {
1995             die "invalid security group name '$adr'\n";
1996         }
1997     } elsif ($adr =~ m/^${ip_alias_pattern}$/){
1998         my $alias = lc($adr);
1999         my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2000         $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
2001         die "no such alias '$adr'\n" if !$e;
2002         $match = "-${dir} $e->{cidr}";
2003     } elsif ($adr =~ m/\-/){
2004         $match = "-m iprange --${srcdst}-range $adr";
2005     } else {
2006         $match = "-${dir} $adr";
2007     }
2008
2009     return $match;
2010 }
2011
2012 # convert a %rule to an array of iptables commands
2013 sub ipt_rule_to_cmds {
2014     my ($rule, $chain, $ipversion, $cluster_conf, $fw_conf, $vmid) = @_;
2015
2016     die "ipt_rule_to_cmds unable to handle macro" if $rule->{macro}; #should not happen
2017
2018     my @match = ();
2019
2020     if (defined $rule->{match}) {
2021         push @match, $rule->{match};
2022     } else {
2023         push @match, "-i $rule->{iface_in}" if $rule->{iface_in};
2024         push @match, "-o $rule->{iface_out}" if $rule->{iface_out};
2025
2026         if ($rule->{source}) {
2027             push @match, ipt_gen_src_or_dst_match($rule->{source}, 's', $ipversion, $cluster_conf, $fw_conf);
2028         }
2029         if ($rule->{dest}) {
2030             push @match, ipt_gen_src_or_dst_match($rule->{dest}, 'd', $ipversion, $cluster_conf, $fw_conf);
2031         }
2032
2033         if (my $proto = $rule->{proto}) {
2034             push @match, "-p $proto";
2035
2036             my $multidport = defined($rule->{dport}) && parse_port_name_number_or_range($rule->{dport}, 1);
2037             my $multisport = defined($rule->{sport}) && parse_port_name_number_or_range($rule->{sport}, 0);
2038
2039             my $add_dport = sub {
2040                 return if !$rule->{dport};
2041
2042                 if ($proto eq 'icmp') {
2043                     # Note: we use dport to store --icmp-type
2044                     die "unknown icmp-type '$rule->{dport}'\n"
2045                         if $rule->{dport} !~ /^\d+$/ && !defined($icmp_type_names->{$rule->{dport}});
2046                     push @match, "-m icmp --icmp-type $rule->{dport}";
2047                 } elsif ($proto eq 'icmpv6') {
2048                     # Note: we use dport to store --icmpv6-type
2049                     die "unknown icmpv6-type '$rule->{dport}'\n"
2050                         if $rule->{dport} !~ /^\d+$/ && !defined($icmpv6_type_names->{$rule->{dport}});
2051                     push @match, "-m icmpv6 --icmpv6-type $rule->{dport}";
2052                 } elsif (!$PROTOCOLS_WITH_PORTS->{$proto}) {
2053                     die "protocol $proto does not have ports\n";
2054                 } elsif ($multidport) {
2055                     push @match, "--match multiport", "--dports $rule->{dport}";
2056                 } else {
2057                     push @match, "--dport $rule->{dport}";
2058                 }
2059             };
2060
2061             my $add_sport = sub {
2062                 return if !$rule->{sport};
2063
2064                 die "protocol $proto does not have ports\n"
2065                     if !$PROTOCOLS_WITH_PORTS->{$proto};
2066                 if ($multisport) {
2067                     push @match, "--match multiport", "--sports $rule->{sport}";
2068                 } else {
2069                     push @match, "--sport $rule->{sport}";
2070                 }
2071             };
2072
2073             # order matters - single port before multiport!
2074             $add_dport->() if $multisport;
2075             $add_sport->();
2076             $add_dport->() if !$multisport;
2077         } elsif ($rule->{dport} || $rule->{sport}) {
2078             die "destination port '$rule->{dport}', but no protocol specified\n" if $rule->{dport};
2079             die "source port '$rule->{sport}', but no protocol specified\n" if $rule->{sport};
2080         }
2081
2082         push @match, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
2083     }
2084     my $matchstr = scalar(@match) ? join(' ', @match) : "";
2085
2086     my $targetstr;
2087     if (defined $rule->{target}) {
2088         $targetstr = $rule->{target};
2089     } else {
2090         my $action = (defined $rule->{action}) ? $rule->{action} : "";
2091         my $goto = 1 if $action eq 'PVEFW-SET-ACCEPT-MARK';
2092         $targetstr = ($goto) ? "-g $action" : "-j $action";
2093     }
2094
2095     my @iptcmds;
2096     my $log = $rule->{log};
2097     if (defined($log) && $log ne 'nolog') {
2098         my $loglevel = $log_level_hash->{$log};
2099         my $logaction = get_log_rule_base($chain, $vmid, $rule->{logmsg}, $loglevel);
2100         push @iptcmds, "-A $chain $matchstr $logaction";
2101     }
2102     push @iptcmds, "-A $chain $matchstr $targetstr";
2103     return @iptcmds;
2104 }
2105
2106 sub ruleset_generate_rule {
2107     my ($ruleset, $chain, $ipversion, $rule, $cluster_conf, $fw_conf, $vmid) = @_;
2108
2109     my $rules;
2110
2111     if ($rule->{macro}) {
2112         $rules = &$apply_macro($rule->{macro}, $rule, 0, $ipversion);
2113     } else {
2114         $rules = [ $rule ];
2115     }
2116
2117     # update all or nothing
2118     my @ipt_rule_cmds;
2119     foreach my $r (@$rules) {
2120         push @ipt_rule_cmds, ipt_rule_to_cmds($r, $chain, $ipversion, $cluster_conf, $fw_conf, $vmid);
2121     }
2122     foreach my $c (@ipt_rule_cmds) {
2123         ruleset_add_ipt_cmd($ruleset, $chain, $c);
2124     }
2125 }
2126
2127 sub ruleset_create_chain {
2128     my ($ruleset, $chain) = @_;
2129
2130     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
2131     die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
2132
2133     die "chain '$chain' already exists\n" if $ruleset->{$chain};
2134
2135     $ruleset->{$chain} = [];
2136 }
2137
2138 sub ruleset_chain_exist {
2139     my ($ruleset, $chain) = @_;
2140
2141     return $ruleset->{$chain} ? 1 : undef;
2142 }
2143
2144 # add an iptables command (like generated by ipt_rule_to_cmds) to a chain
2145 sub ruleset_add_ipt_cmd {
2146    my ($ruleset, $chain, $iptcmd) = @_;
2147
2148    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2149
2150    push @{$ruleset->{$chain}}, $iptcmd;
2151 }
2152
2153 sub ruleset_addrule {
2154     my ($ruleset, $chain, $match, $action, $log, $logmsg, $vmid) = @_;
2155
2156     die "no such chain '$chain'\n" if !$ruleset->{$chain};
2157
2158     if ($log) {
2159         my $loglevel = $log_level_hash->{$log};
2160         my $logaction = get_log_rule_base($chain, $vmid, $logmsg, $loglevel);
2161         push @{$ruleset->{$chain}}, "-A $chain $match $logaction";
2162     }
2163     # for stable ebtables digests avoid double-spaces to match ebtables-save output
2164     $match .= ' ' if length($match);
2165     push @{$ruleset->{$chain}}, "-A $chain ${match}$action";
2166 }
2167
2168 sub ruleset_insertrule {
2169    my ($ruleset, $chain, $match, $action, $log) = @_;
2170
2171    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2172
2173    unshift @{$ruleset->{$chain}}, "-A $chain $match $action";
2174 }
2175
2176 sub get_log_rule_base {
2177     my ($chain, $vmid, $msg, $loglevel) = @_;
2178
2179     $vmid = 0 if !defined($vmid);
2180     $msg = "" if !defined($msg);
2181
2182     my $rlimit = '';
2183     if (defined($global_log_ratelimit)) {
2184         $rlimit = "-m limit $global_log_ratelimit ";
2185     }
2186
2187     # Note: we use special format for prefix to pass further
2188     # info to log daemon (VMID, LOGLEVEL and CHAIN)
2189     return "${rlimit}-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
2190 }
2191
2192 sub ruleset_add_chain_policy {
2193     my ($ruleset, $chain, $ipversion, $vmid, $policy, $loglevel, $accept_action) = @_;
2194
2195     if ($policy eq 'ACCEPT') {
2196
2197         my $rule = { action => 'ACCEPT' };
2198         rule_substitude_action($rule, { ACCEPT =>  $accept_action});
2199         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule);
2200
2201     } elsif ($policy eq 'DROP') {
2202
2203         ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Drop");
2204
2205         ruleset_addrule($ruleset, $chain, "", "-j DROP", $loglevel, "policy $policy: ", $vmid);
2206     } elsif ($policy eq 'REJECT') {
2207         ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Reject");
2208
2209         ruleset_addrule($ruleset, $chain, "", "-g PVEFW-reject", $loglevel, "policy $policy: ", $vmid);
2210     } else {
2211         # should not happen
2212         die "internal error: unknown policy '$policy'";
2213     }
2214 }
2215
2216 sub ruleset_chain_add_ndp {
2217     my ($ruleset, $chain, $ipversion, $options, $direction, $accept) = @_;
2218     return if $ipversion != 6 || (defined($options->{ndp}) && !$options->{ndp});
2219
2220     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-solicitation", $accept);
2221     if ($direction ne 'OUT' || $options->{radv}) {
2222         ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", $accept);
2223     }
2224     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-solicitation", $accept);
2225     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-advertisement", $accept);
2226 }
2227
2228 sub ruleset_chain_add_conn_filters {
2229     my ($ruleset, $chain, $allow_invalid, $accept) = @_;
2230
2231     if (!$allow_invalid) {
2232         ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID", "-j DROP");
2233     }
2234     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED", "-j $accept");
2235 }
2236
2237 sub ruleset_chain_add_input_filters {
2238     my ($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel) = @_;
2239
2240     if ($cluster_conf->{ipset}->{blacklist}){
2241         if (!ruleset_chain_exist($ruleset, "PVEFW-blacklist")) {
2242             ruleset_create_chain($ruleset, "PVEFW-blacklist");
2243             ruleset_addrule($ruleset, "PVEFW-blacklist", "", "-j DROP", $loglevel, "DROP: ", 0);
2244         }
2245         my $ipset_chain = compute_ipset_chain_name(0, 'blacklist', $ipversion);
2246         ruleset_addrule($ruleset, $chain, "-m set --match-set ${ipset_chain} src", "-j PVEFW-blacklist");
2247     }
2248
2249     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
2250         if ($ipversion == 4) {
2251             ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW", "-j PVEFW-smurfs");
2252         }
2253     }
2254
2255     if ($options->{tcpflags}) {
2256         ruleset_addrule($ruleset, $chain, "-p tcp", "-j PVEFW-tcpflags");
2257     }
2258 }
2259
2260 sub ruleset_create_vm_chain {
2261     my ($ruleset, $chain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction) = @_;
2262
2263     ruleset_create_chain($ruleset, $chain);
2264     my $accept = generate_nfqueue($options);
2265
2266     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
2267         if ($ipversion == 4) {
2268             if ($direction eq 'OUT') {
2269                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2270                                       { action => 'PVEFW-SET-ACCEPT-MARK',
2271                                         proto => 'udp', sport => 68, dport => 67 });
2272             } else {
2273                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2274                                       { action => 'ACCEPT',
2275                                         proto => 'udp', sport => 67, dport => 68 });
2276             }
2277         } elsif ($ipversion == 6) {
2278             if ($direction eq 'OUT') {
2279                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2280                                       { action => 'PVEFW-SET-ACCEPT-MARK',
2281                                         proto => 'udp', sport => 546, dport => 547 });
2282             } else {
2283                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2284                                       { action => 'ACCEPT',
2285                                         proto => 'udp', sport => 547, dport => 546 });
2286             }
2287         }
2288
2289     }
2290
2291     if ($direction eq 'OUT') {
2292         if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
2293             ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr", "-j DROP");
2294         }
2295         if ($ipversion == 6 && !$options->{radv}) {
2296             ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", "-j DROP");
2297         }
2298         if ($ipfilter_ipset) {
2299             ruleset_addrule($ruleset, $chain, "-m set ! --match-set $ipfilter_ipset src", "-j DROP");
2300         }
2301         ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2302     }
2303
2304     my $accept_action = $direction eq 'OUT' ? '-g PVEFW-SET-ACCEPT-MARK' : "-j $accept";
2305     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, $direction, $accept_action);
2306 }
2307
2308 sub ruleset_add_group_rule {
2309     my ($ruleset, $cluster_conf, $chain, $rule, $direction, $action, $ipversion) = @_;
2310
2311     my $group = $rule->{action};
2312     my $group_chain = "GROUP-$group-$direction";
2313     if(!ruleset_chain_exist($ruleset, $group_chain)){
2314         generate_group_rules($ruleset, $cluster_conf, $group, $ipversion);
2315     }
2316
2317     if ($direction eq 'OUT' && $rule->{iface_out}) {
2318         ruleset_addrule($ruleset, $chain, "-o $rule->{iface_out}", "-j $group_chain");
2319     } elsif ($direction eq 'IN' && $rule->{iface_in}) {
2320         ruleset_addrule($ruleset, $chain, "-i $rule->{iface_in}", "-j $group_chain");
2321     } else {
2322         ruleset_addrule($ruleset, $chain, "", "-j $group_chain");
2323     }
2324
2325     ruleset_addrule($ruleset, $chain, "-m mark --mark $FWACCEPTMARK_ON", "-j $action");
2326 }
2327
2328 sub ruleset_generate_vm_rules {
2329     my ($ruleset, $rules, $cluster_conf, $vmfw_conf, $chain, $netid, $direction, $options, $ipversion, $vmid) = @_;
2330
2331     my $lc_direction = lc($direction);
2332
2333     my $in_accept = generate_nfqueue($options);
2334
2335     foreach my $rule (@$rules) {
2336         next if $rule->{iface} && $rule->{iface} ne $netid;
2337         next if !$rule->{enable} || $rule->{errors};
2338         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2339
2340         if ($rule->{type} eq 'group') {
2341             ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, $direction,
2342                                    $direction eq 'OUT' ? 'RETURN' : $in_accept, $ipversion);
2343         } else {
2344             next if $rule->{type} ne $lc_direction;
2345             eval {
2346                 $rule->{logmsg} = "$rule->{action}: ";
2347                 if ($direction eq 'OUT') {
2348                     rule_substitude_action($rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
2349                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $vmfw_conf, $vmid);
2350                 } else {
2351                     rule_substitude_action($rule, { ACCEPT => $in_accept , REJECT => "PVEFW-reject" });
2352                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $vmfw_conf, $vmid);
2353                 }
2354             };
2355             warn $@ if $@;
2356         }
2357     }
2358 }
2359
2360 sub generate_nfqueue {
2361     my ($options) = @_;
2362
2363     if ($options->{ips}) {
2364         my $action = "NFQUEUE";
2365         if ($options->{ips_queues} && $options->{ips_queues} =~ m/^(\d+)(:(\d+))?$/) {
2366             if (defined($3) && defined($1)) {
2367                 $action .= " --queue-balance $1:$3";
2368             } elsif (defined($1)) {
2369                 $action .= " --queue-num $1";
2370             }
2371         }
2372         $action .= " --queue-bypass" if $feature_ipset_nomatch; #need kernel 3.10
2373         return $action;
2374     } else {
2375         return "ACCEPT";
2376     }
2377 }
2378
2379 sub ruleset_generate_vm_ipsrules {
2380     my ($ruleset, $options, $direction, $iface) = @_;
2381
2382     if ($options->{ips} && $direction eq 'IN') {
2383         my $nfqueue = generate_nfqueue($options);
2384
2385         if (!ruleset_chain_exist($ruleset, "PVEFW-IPS")) {
2386             ruleset_create_chain($ruleset, "PVEFW-IPS");
2387         }
2388
2389         ruleset_addrule($ruleset, "PVEFW-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged", "-j $nfqueue");
2390     }
2391 }
2392
2393 sub generate_tap_rules_direction {
2394     my ($ruleset, $cluster_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $direction, $ipversion) = @_;
2395
2396     my $lc_direction = lc($direction);
2397
2398     my $rules = $vmfw_conf->{rules};
2399
2400     my $options = $vmfw_conf->{options};
2401     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
2402
2403     my $tapchain = "$iface-$direction";
2404
2405     my $ipfilter_name = compute_ipfilter_ipset_name($netid);
2406     my $ipfilter_ipset = compute_ipset_chain_name($vmid, $ipfilter_name, $ipversion)
2407         if $options->{ipfilter} || $vmfw_conf->{ipset}->{$ipfilter_name};
2408
2409     if ($options->{enable}) {
2410         # create chain with mac and ip filter
2411         ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
2412
2413         ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $tapchain, $netid, $direction, $options, $ipversion, $vmid);
2414
2415         ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface);
2416
2417         # implement policy
2418         my $policy;
2419
2420         if ($direction eq 'OUT') {
2421             $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
2422         } else {
2423             $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
2424         }
2425
2426         my $accept = generate_nfqueue($options);
2427         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
2428         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, $policy, $loglevel, $accept_action);
2429     } else {
2430         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : 'ACCEPT';
2431         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, 'ACCEPT', $loglevel, $accept_action);
2432     }
2433
2434     # plug the tap chain to bridge chain
2435     if ($direction eq 'IN') {
2436         ruleset_addrule($ruleset, "PVEFW-FWBR-IN",
2437                         "-m physdev --physdev-is-bridged --physdev-out $iface", "-j $tapchain");
2438     } else {
2439         ruleset_addrule($ruleset, "PVEFW-FWBR-OUT",
2440                         "-m physdev --physdev-is-bridged --physdev-in $iface", "-j $tapchain");
2441     }
2442 }
2443
2444 sub enable_host_firewall {
2445     my ($ruleset, $hostfw_conf, $cluster_conf, $ipversion, $corosync_conf) = @_;
2446
2447     my $options = $hostfw_conf->{options};
2448     my $cluster_options = $cluster_conf->{options};
2449     my $rules = $hostfw_conf->{rules};
2450     my $cluster_rules = $cluster_conf->{rules};
2451
2452     # corosync preparation
2453     my $corosync_rule = "-p udp --dport 5404:5405";
2454     my $corosync_local_addresses = {};
2455     my $multicast_enabled;
2456     my $local_hostname = PVE::INotify::nodename();
2457     if (defined($corosync_conf)) {
2458         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2459             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2460
2461             if ($node_name eq $local_hostname) {
2462                 $corosync_local_addresses->{$key} = $node_ip;
2463             }
2464         });
2465
2466         # allow multicast only if enabled in config
2467         my $corosync_transport = $corosync_conf->{main}->{totem}->{transport};
2468         $multicast_enabled = defined($corosync_transport) && $corosync_transport eq 'udp';
2469     }
2470
2471     # host inbound firewall
2472     my $chain = "PVEFW-HOST-IN";
2473     ruleset_create_chain($ruleset, $chain);
2474
2475     my $loglevel = get_option_log_level($options, "log_level_in");
2476
2477     ruleset_addrule($ruleset, $chain, "-i lo", "-j ACCEPT");
2478
2479     ruleset_chain_add_conn_filters($ruleset, $chain, 0, 'ACCEPT');
2480     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'IN', '-j RETURN');
2481     ruleset_chain_add_input_filters($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel);
2482
2483     # we use RETURN because we need to check also tap rules
2484     my $accept_action = 'RETURN';
2485
2486     ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
2487
2488     # add host rules first, so that cluster wide rules can be overwritten
2489     foreach my $rule (@$rules, @$cluster_rules) {
2490         next if !$rule->{enable} || $rule->{errors};
2491         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2492
2493         $rule->{iface_in} = $rule->{iface} if $rule->{iface};
2494
2495         eval {
2496             $rule->{logmsg} = "$rule->{action}: ";
2497             if ($rule->{type} eq 'group') {
2498                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'IN', $accept_action, $ipversion);
2499             } elsif ($rule->{type} eq 'in') {
2500                 rule_substitude_action($rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
2501                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $hostfw_conf, 0);
2502             }
2503         };
2504         warn $@ if $@;
2505         delete $rule->{iface_in};
2506     }
2507
2508     # allow standard traffic for management ipset (includes cluster network)
2509     my $mngmnt_ipset_chain = compute_ipset_chain_name(0, "management", $ipversion);
2510     my $mngmntsrc = "-m set --match-set ${mngmnt_ipset_chain} src";
2511     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 8006", "-j $accept_action");  # PVE API
2512     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
2513     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
2514     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 22", "-j $accept_action");  # SSH
2515     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 60000:60050", "-j $accept_action");  # Migration
2516
2517     # corosync inbound rules
2518     if (defined($corosync_conf)) {
2519         ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action")
2520             if $multicast_enabled;
2521
2522         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2523             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2524             my $destination = $corosync_local_addresses->{$key};
2525
2526             if ($node_name ne $local_hostname && defined($destination)) {
2527                 # accept only traffic on same ring
2528                 ruleset_addrule($ruleset, $chain, "-d $destination -s $node_ip $corosync_rule", "-j $accept_action");
2529             }
2530         });
2531     }
2532
2533     # implement input policy
2534     my $policy = $cluster_options->{policy_in} || 'DROP'; # allow nothing by default
2535     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2536
2537     # host outbound firewall
2538     $chain = "PVEFW-HOST-OUT";
2539     ruleset_create_chain($ruleset, $chain);
2540
2541     $loglevel = get_option_log_level($options, "log_level_out");
2542
2543     ruleset_addrule($ruleset, $chain, "-o lo", "-j ACCEPT");
2544
2545     ruleset_chain_add_conn_filters($ruleset, $chain, 0, 'ACCEPT');
2546
2547     # we use RETURN because we may want to check other thigs later
2548     $accept_action = 'RETURN';
2549     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'OUT', "-j $accept_action");
2550
2551     ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
2552
2553     # add host rules first, so that cluster wide rules can be overwritten
2554     foreach my $rule (@$rules, @$cluster_rules) {
2555         next if !$rule->{enable} || $rule->{errors};
2556         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2557
2558         $rule->{iface_out} = $rule->{iface} if $rule->{iface};
2559         eval {
2560             $rule->{logmsg} = "$rule->{action}: ";
2561             if ($rule->{type} eq 'group') {
2562                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'OUT', $accept_action, $ipversion);
2563             } elsif ($rule->{type} eq 'out') {
2564                 rule_substitude_action($rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
2565                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $hostfw_conf, 0);
2566             }
2567         };
2568         warn $@ if $@;
2569         delete $rule->{iface_out};
2570     }
2571
2572     # allow standard traffic on cluster network
2573     my $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
2574     my $localnet_ver = $cluster_conf->{aliases}->{local_network}->{ipversion};
2575
2576     if ($localnet && ($ipversion == $localnet_ver)) {
2577         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 8006", "-j $accept_action");  # PVE API
2578         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 22", "-j $accept_action");  # SSH
2579         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
2580         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
2581     }
2582
2583     # corosync outbound rules
2584     if (defined($corosync_conf)) {
2585         ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action")
2586             if $multicast_enabled;
2587
2588         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2589             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2590             my $source = $corosync_local_addresses->{$key};
2591
2592             if ($node_name ne $local_hostname && defined($source)) {
2593                 # accept only traffic on same ring
2594                 ruleset_addrule($ruleset, $chain, "-s $source -d $node_ip $corosync_rule", "-j $accept_action");
2595             }
2596         });
2597     }
2598
2599     # implement output policy
2600     $policy = $cluster_options->{policy_out} || 'ACCEPT'; # allow everything by default
2601     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2602
2603     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "", "-j PVEFW-HOST-OUT");
2604     ruleset_addrule($ruleset, "PVEFW-INPUT", "", "-j PVEFW-HOST-IN");
2605 }
2606
2607 sub generate_group_rules {
2608     my ($ruleset, $cluster_conf, $group, $ipversion) = @_;
2609
2610     my $rules = $cluster_conf->{groups}->{$group};
2611
2612     if (!$rules) {
2613         warn "no such security group '$group'\n";
2614         $rules = []; # create empty chain
2615     }
2616
2617     my $chain = "GROUP-${group}-IN";
2618
2619     ruleset_create_chain($ruleset, $chain);
2620     ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2621
2622     foreach my $rule (@$rules) {
2623         next if $rule->{type} ne 'in';
2624         next if !$rule->{enable} || $rule->{errors};
2625         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2626         rule_substitude_action($rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
2627         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf);
2628     }
2629
2630     $chain = "GROUP-${group}-OUT";
2631
2632     ruleset_create_chain($ruleset, $chain);
2633     ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2634
2635     foreach my $rule (@$rules) {
2636         next if $rule->{type} ne 'out';
2637         next if !$rule->{enable} || $rule->{errors};
2638         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2639         # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
2640         # check also other tap rules later
2641         rule_substitude_action($rule, { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" });
2642         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf);
2643     }
2644 }
2645
2646 my $MAX_NETS = 32;
2647 my $valid_netdev_names = {};
2648 for (my $i = 0; $i < $MAX_NETS; $i++)  {
2649     $valid_netdev_names->{"net$i"} = 1;
2650 }
2651
2652 sub get_mark_values {
2653     my ($value, $mask) = @_;
2654     $value = hex($value) if $value =~ /^0x/;
2655     $mask = hex($mask) if defined($mask) && $mask =~ /^0x/;
2656     $mask = 0xffffffff if !defined($mask);
2657     return ($value, $mask);
2658 }
2659
2660 sub parse_fw_rule {
2661     my ($prefix, $line, $cluster_conf, $fw_conf, $rule_env) = @_;
2662
2663     my $orig_line = $line;
2664
2665     my $rule = {};
2666
2667     # we can add single line comments to the end of the rule
2668     if ($line =~ s/#\s*(.*?)\s*$//) {
2669         $rule->{comment} = decode('utf8', $1);
2670     }
2671
2672     # we can disable a rule when prefixed with '|'
2673
2674     $rule->{enable} = $line =~ s/^\|// ? 0 : 1;
2675
2676     $line =~ s/^(\S+)\s+(\S+)\s*// ||
2677         die "unable to parse rule: $line\n";
2678
2679     $rule->{type} = lc($1);
2680     $rule->{action} = $2;
2681
2682     if ($rule->{type} eq  'in' || $rule->{type} eq 'out') {
2683         if ($rule->{action} =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
2684             $rule->{macro} = $1;
2685             $rule->{action} = $2;
2686         }
2687     }
2688
2689     while (length($line)) {
2690         if ($line =~ s/^-i (\S+)\s*//) {
2691             $rule->{iface} = $1;
2692             next;
2693         }
2694
2695         last if $rule->{type} eq 'group';
2696
2697         if ($line =~ s/^-p (\S+)\s*//) {
2698             $rule->{proto} = $1;
2699             next;
2700         }
2701
2702         if ($line =~ s/^-dport (\S+)\s*//) {
2703             $rule->{dport} = $1;
2704             next;
2705         }
2706
2707         if ($line =~ s/^-sport (\S+)\s*//) {
2708             $rule->{sport} = $1;
2709             next;
2710         }
2711         if ($line =~ s/^-source (\S+)\s*//) {
2712             $rule->{source} = $1;
2713             next;
2714         }
2715         if ($line =~ s/^-dest (\S+)\s*//) {
2716             $rule->{dest} = $1;
2717             next;
2718         }
2719         if ($line =~ s/^-log (emerg|alert|crit|err|warning|notice|info|debug|nolog)\s*//) {
2720             $rule->{log} = $1;
2721             next;
2722         }
2723
2724         last;
2725     }
2726
2727     die "unable to parse rule parameters: $line\n" if length($line);
2728
2729     $rule = verify_rule($rule, $cluster_conf, $fw_conf, $rule_env, 1);
2730     if ($rule->{errors}) {
2731         # The verbose flag really means we're running from the CLI and want
2732         # output on the console - in the other case we really want such errors
2733         # to go into the syslog instead.
2734         my $log = $verbose ? sub { warn @_ } : sub { syslog(err => @_) };
2735         $log->("$prefix - errors in rule parameters: $orig_line\n");
2736         foreach my $p (keys %{$rule->{errors}}) {
2737             $log->("  $p: $rule->{errors}->{$p}\n");
2738         }
2739     }
2740
2741     return $rule;
2742 }
2743
2744 sub verify_ethertype {
2745     my ($value) = @_;
2746     my $types = get_etc_ethertypes();
2747     die "unknown ethernet protocol type: $value\n"
2748         if !defined($types->{byname}->{$value}) &&
2749            !defined($types->{byid}->{$value});
2750 }
2751
2752 sub parse_vmfw_option {
2753     my ($line) = @_;
2754
2755     my ($opt, $value);
2756
2757     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2758
2759     if ($line =~ m/^(enable|dhcp|ndp|radv|macfilter|ipfilter|ips):\s*(0|1)\s*$/i) {
2760         $opt = lc($1);
2761         $value = int($2);
2762     } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
2763         $opt = lc($1);
2764         $value = $2 ? lc($3) : '';
2765     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2766         $opt = lc($1);
2767         $value = uc($3);
2768     } elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
2769         $opt = lc($1);
2770         $value = $2;
2771     } elsif ($line =~ m/^(layer2_protocols):\s*(((\S+)[,]?)+)\s*$/i) {
2772         $opt = lc($1);
2773         $value = $2;
2774         verify_ethertype($_) foreach split(/\s*,\s*/, $value);
2775     } else {
2776         die "can't parse option '$line'\n"
2777     }
2778
2779     return ($opt, $value);
2780 }
2781
2782 sub parse_hostfw_option {
2783     my ($line) = @_;
2784
2785     my ($opt, $value);
2786
2787     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2788
2789     if ($line =~ m/^(enable|nosmurfs|tcpflags|ndp|log_nf_conntrack|nf_conntrack_allow_invalid|protection_synflood):\s*(0|1)\s*$/i) {
2790         $opt = lc($1);
2791         $value = int($2);
2792     } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
2793         $opt = lc($1);
2794         $value = $2 ? lc($3) : '';
2795     } elsif ($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) {
2796         $opt = lc($1);
2797         $value = int($2);
2798     } else {
2799         die "can't parse option '$line'\n"
2800     }
2801
2802     return ($opt, $value);
2803 }
2804
2805 sub parse_clusterfw_option {
2806     my ($line) = @_;
2807
2808     my ($opt, $value);
2809
2810     if ($line =~ m/^(enable):\s*(\d+)\s*$/i) {
2811         $opt = lc($1);
2812         $value = int($2);
2813         if (($value > 1) && ((time() - $value) > 60)) {
2814             $value = 0
2815         }
2816     } elsif ($line =~ m/^(ebtables):\s*(0|1)\s*$/i) {
2817         $opt = lc($1);
2818         $value = int($2);
2819     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2820         $opt = lc($1);
2821         $value = uc($3);
2822     } elsif ($line =~ m/^(log_ratelimit):\s*(\S+)\s*$/) {
2823         $opt = lc($1);
2824         $value = $2;
2825     } else {
2826         die "can't parse option '$line'\n"
2827     }
2828
2829     return ($opt, $value);
2830 }
2831
2832 sub resolve_alias {
2833     my ($clusterfw_conf, $fw_conf, $cidr) = @_;
2834
2835     my $alias = lc($cidr);
2836     my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2837     $e = $clusterfw_conf->{aliases}->{$alias} if !$e && $clusterfw_conf;
2838
2839     die "no such alias '$cidr'\n" if !$e;;
2840
2841     return wantarray ? ($e->{cidr}, $e->{ipversion}) : $e->{cidr};
2842 }
2843
2844 sub parse_ip_or_cidr {
2845     my ($cidr) = @_;
2846
2847     my $ipversion;
2848
2849     if ($cidr =~ m!^(?:$IPV6RE)(/(\d+))?$!) {
2850         $cidr =~ s|/128$||;
2851         $ipversion = 6;
2852     } elsif ($cidr =~ m!^(?:$IPV4RE)(/(\d+))?$!) {
2853         $cidr =~ s|/32$||;
2854         $ipversion = 4;
2855     } else {
2856         die "value does not look like a valid IP address or CIDR network\n";
2857     }
2858
2859     return wantarray ? ($cidr, $ipversion) : $cidr;
2860 }
2861
2862 sub parse_alias {
2863     my ($line) = @_;
2864
2865     # we can add single line comments to the end of the line
2866     my $comment = decode('utf8', $1) if $line =~ s/\s*#\s*(.*?)\s*$//;
2867
2868     if ($line =~ m/^(\S+)\s(\S+)$/) {
2869         my ($name, $cidr) = ($1, $2);
2870         my $ipversion;
2871
2872         ($cidr, $ipversion) = parse_ip_or_cidr($cidr);
2873
2874         my $data = {
2875             name => $name,
2876             cidr => $cidr,
2877             ipversion => $ipversion,
2878         };
2879         $data->{comment} = $comment  if $comment;
2880         return $data;
2881     }
2882
2883     return undef;
2884 }
2885
2886 sub generic_fw_config_parser {
2887     my ($filename, $cluster_conf, $empty_conf, $rule_env) = @_;
2888
2889     my $section;
2890     my $group;
2891
2892     my $res = $empty_conf;
2893
2894     my $raw;
2895     if ($filename =~ m!^/etc/pve/(.*)$!) {
2896         $raw = PVE::Cluster::get_config($1);
2897     } else {
2898         $raw = eval { PVE::Tools::file_get_contents($filename) }; # ignore errors
2899     }
2900     return {} if !$raw;
2901
2902     my $curr_group_keys = {};
2903
2904     my $linenr = 0;
2905     while ($raw =~ /^\h*(.*?)\h*$/gm) {
2906         my $line = $1;
2907         $linenr++;
2908         next if $line =~ m/^#/;
2909         next if $line =~ m/^\s*$/;
2910         chomp $line;
2911
2912         my $prefix = "$filename (line $linenr)";
2913
2914         if ($empty_conf->{options} && ($line =~ m/^\[options\]$/i)) {
2915             $section = 'options';
2916             next;
2917         }
2918
2919         if ($empty_conf->{aliases} && ($line =~ m/^\[aliases\]$/i)) {
2920             $section = 'aliases';
2921             next;
2922         }
2923
2924         if ($empty_conf->{groups} && ($line =~ m/^\[group\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2925             $section = 'groups';
2926             $group = lc($1);
2927             my $comment = $2;
2928             eval {
2929                 die "security group name too long\n" if length($group) > $max_group_name_length;
2930                 die "invalid security group name '$group'\n" if $group !~ m/^${security_group_name_pattern}$/;
2931             };
2932             if (my $err = $@) {
2933                 ($section, $group, $comment) = undef;
2934                 warn "$prefix: $err";
2935                 next;
2936             }
2937
2938             $res->{$section}->{$group} = [];
2939             $res->{group_comments}->{$group} =  decode('utf8', $comment)
2940                 if $comment;
2941             next;
2942         }
2943
2944         if ($empty_conf->{rules} && ($line =~ m/^\[rules\]$/i)) {
2945             $section = 'rules';
2946             next;
2947         }
2948
2949         if ($empty_conf->{ipset} && ($line =~ m/^\[ipset\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2950             $section = 'ipset';
2951             $group = lc($1);
2952             my $comment = $2;
2953             eval {
2954                 die "ipset name too long\n" if length($group) > $max_ipset_name_length;
2955                 die "invalid ipset name '$group'\n" if $group !~ m/^${ipset_name_pattern}$/;
2956             };
2957             if (my $err = $@) {
2958                 ($section, $group, $comment) = undef;
2959                 warn "$prefix: $err";
2960                 next;
2961             }
2962
2963             $res->{$section}->{$group} = [];
2964             $curr_group_keys = {};
2965
2966             $res->{ipset_comments}->{$group} = decode('utf8', $comment)
2967                 if $comment;
2968             next;
2969         }
2970
2971         if (!$section) {
2972             warn "$prefix: skip line - no section\n";
2973             next;
2974         }
2975
2976         if ($section eq 'options') {
2977             eval {
2978                 my ($opt, $value);
2979                 if ($rule_env eq 'cluster') {
2980                     ($opt, $value) = parse_clusterfw_option($line);
2981                 } elsif ($rule_env eq 'host') {
2982                     ($opt, $value) = parse_hostfw_option($line);
2983                 } else {
2984                     ($opt, $value) = parse_vmfw_option($line);
2985                 }
2986                 $res->{options}->{$opt} = $value;
2987             };
2988             warn "$prefix: $@" if $@;
2989         } elsif ($section eq 'aliases') {
2990             eval {
2991                 my $data = parse_alias($line);
2992                 $res->{aliases}->{lc($data->{name})} = $data;
2993             };
2994             warn "$prefix: $@" if $@;
2995         } elsif ($section eq 'rules') {
2996             my $rule;
2997             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, $res, $rule_env); };
2998             if (my $err = $@) {
2999                 warn "$prefix: $err";
3000                 next;
3001             }
3002             push @{$res->{$section}}, $rule;
3003         } elsif ($section eq 'groups') {
3004             my $rule;
3005             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, undef, 'group'); };
3006             if (my $err = $@) {
3007                 warn "$prefix: $err";
3008                 next;
3009             }
3010             push @{$res->{$section}->{$group}}, $rule;
3011         } elsif ($section eq 'ipset') {
3012             # we can add single line comments to the end of the rule
3013             my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
3014
3015             $line =~ m/^(\!)?\s*(\S+)\s*$/;
3016             my $nomatch = $1;
3017             my $cidr = $2;
3018             my $errors;
3019
3020             if ($nomatch && !$feature_ipset_nomatch) {
3021                 $errors->{nomatch} = "nomatch not supported by kernel";
3022             }
3023
3024             eval {
3025                 if ($cidr =~ m/^${ip_alias_pattern}$/) {
3026                     resolve_alias($cluster_conf, $res, $cidr); # make sure alias exists
3027                 } else {
3028                     $cidr = parse_ip_or_cidr($cidr);
3029                 }
3030                 die "duplicate ipset entry for '$cidr'\n"
3031                     if defined($curr_group_keys->{$cidr});
3032             };
3033             if (my $err = $@) {
3034                 chomp $err;
3035                 $errors->{cidr} = $err;
3036             }
3037
3038             if ($cidr =~ m!/0+$!) {
3039                 $errors->{cidr} = "a zero prefix is not allowed in ipset entries\n";
3040             }
3041
3042             my $entry = { cidr => $cidr };
3043             $entry->{nomatch} = 1 if $nomatch;
3044             $entry->{comment} = $comment if $comment;
3045             $entry->{errors} =  $errors if $errors;
3046
3047             if ($verbose && $errors) {
3048                 warn "$prefix - errors in ipset '$group': $line\n";
3049                 foreach my $p (keys %{$errors}) {
3050                     warn "  $p: $errors->{$p}\n";
3051                 }
3052             }
3053
3054             push @{$res->{$section}->{$group}}, $entry;
3055             $curr_group_keys->{$cidr} = 1;
3056         } else {
3057             warn "$prefix: skip line - unknown section\n";
3058             next;
3059         }
3060     }
3061
3062     return $res;
3063 }
3064
3065 # this is only used to prevent concurrent runs of rule compilation/application
3066 # see lock_*_conf for cfs locks protectiong config modification
3067 sub run_locked {
3068     my ($code, @param) = @_;
3069
3070     my $timeout = 10;
3071
3072     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
3073
3074     die $@ if $@;
3075
3076     return $res;
3077 }
3078
3079 sub read_local_vm_config {
3080
3081     my $qemu = {};
3082     my $lxc = {};
3083
3084     my $vmdata = { qemu => $qemu, lxc => $lxc };
3085
3086     my $vmlist = PVE::Cluster::get_vmlist();
3087     return $vmdata if !$vmlist || !$vmlist->{ids};
3088     my $ids = $vmlist->{ids};
3089
3090     foreach my $vmid (keys %$ids) {
3091         next if !$vmid; # skip VE0
3092         my $d = $ids->{$vmid};
3093         next if !$d->{node} || $d->{node} ne $nodename;
3094         next if !$d->{type};
3095         if ($d->{type} eq 'qemu') {
3096             if ($have_qemu_server) {
3097                 my $cfspath = PVE::QemuConfig->cfs_config_path($vmid);
3098                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
3099                     $qemu->{$vmid} = $conf;
3100                 }
3101             }
3102         } elsif ($d->{type} eq 'lxc') {
3103             if ($have_lxc) {
3104                 my $cfspath = PVE::LXC::Config->cfs_config_path($vmid);
3105                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
3106                     $lxc->{$vmid} = $conf;
3107                 }
3108             }
3109         }
3110     }
3111
3112     return $vmdata;
3113 };
3114
3115 sub lock_vmfw_conf {
3116     my ($vmid, $timeout, $code, @param) = @_;
3117
3118     die "can't lock VM firewall config for undefined VMID\n"
3119         if !defined($vmid);
3120
3121     my $res = PVE::Cluster::cfs_lock_firewall("vm-$vmid", $timeout, $code, @param);
3122     die $@ if $@;
3123
3124     return $res;
3125 }
3126
3127 sub load_vmfw_conf {
3128     my ($cluster_conf, $rule_env, $vmid, $dir) = @_;
3129
3130     $dir = $pvefw_conf_dir if !defined($dir);
3131     my $filename = "$dir/$vmid.fw";
3132
3133     my $empty_conf = {
3134         rules => [],
3135         options => {},
3136         aliases => {},
3137         ipset => {} ,
3138         ipset_comments => {},
3139     };
3140
3141     my $vmfw_conf = generic_fw_config_parser($filename, $cluster_conf, $empty_conf, $rule_env);
3142     $vmfw_conf->{vmid} = $vmid;
3143
3144     return $vmfw_conf;
3145 }
3146
3147 my $format_rules = sub {
3148     my ($rules, $allow_iface) = @_;
3149
3150     my $raw = '';
3151
3152     foreach my $rule (@$rules) {
3153         if ($rule->{type} eq  'in' || $rule->{type} eq 'out' || $rule->{type} eq 'group') {
3154             $raw .= '|' if defined($rule->{enable}) && !$rule->{enable};
3155             $raw .= uc($rule->{type});
3156             if ($rule->{macro}) {
3157                 $raw .= " $rule->{macro}($rule->{action})";
3158             } else {
3159                 $raw .= " " . $rule->{action};
3160             }
3161             if ($allow_iface && $rule->{iface}) {
3162                 $raw .= " -i $rule->{iface}";
3163             }
3164
3165             if ($rule->{type} ne  'group')  {
3166                 $raw .= " -source $rule->{source}" if $rule->{source};
3167                 $raw .= " -dest $rule->{dest}" if $rule->{dest};
3168                 $raw .= " -p $rule->{proto}" if $rule->{proto};
3169                 $raw .= " -dport $rule->{dport}" if $rule->{dport};
3170                 $raw .= " -sport $rule->{sport}" if $rule->{sport};
3171                 $raw .= " -log $rule->{log}" if $rule->{log};
3172             }
3173
3174             $raw .= " # " . encode('utf8', $rule->{comment})
3175                 if $rule->{comment} && $rule->{comment} !~ m/^\s*$/;
3176             $raw .= "\n";
3177         } else {
3178             die "unknown rule type '$rule->{type}'";
3179         }
3180     }
3181
3182     return $raw;
3183 };
3184
3185 my $format_options = sub {
3186     my ($options) = @_;
3187
3188     my $raw = '';
3189
3190     $raw .= "[OPTIONS]\n\n";
3191     foreach my $opt (keys %$options) {
3192         $raw .= "$opt: $options->{$opt}\n";
3193     }
3194     $raw .= "\n";
3195
3196     return $raw;
3197 };
3198
3199 my $format_aliases = sub {
3200     my ($aliases) = @_;
3201
3202     my $raw = '';
3203
3204     $raw .= "[ALIASES]\n\n";
3205     foreach my $k (keys %$aliases) {
3206         my $e = $aliases->{$k};
3207         $raw .= "$e->{name} $e->{cidr}";
3208         $raw .= " # " . encode('utf8', $e->{comment})
3209             if $e->{comment} && $e->{comment} !~ m/^\s*$/;
3210         $raw .= "\n";
3211     }
3212     $raw .= "\n";
3213
3214     return $raw;
3215 };
3216
3217 my $format_ipsets = sub {
3218     my ($fw_conf) = @_;
3219
3220     my $raw = '';
3221
3222     foreach my $ipset (sort keys %{$fw_conf->{ipset}}) {
3223         if (my $comment = $fw_conf->{ipset_comments}->{$ipset}) {
3224             my $utf8comment = encode('utf8', $comment);
3225             $raw .= "[IPSET $ipset] # $utf8comment\n\n";
3226         } else {
3227             $raw .= "[IPSET $ipset]\n\n";
3228         }
3229         my $options = $fw_conf->{ipset}->{$ipset};
3230
3231         my $nethash = {};
3232         foreach my $entry (@$options) {
3233             my $cidr = $entry->{cidr};
3234             if (defined($nethash->{$cidr})) {
3235                 warn "ignoring duplicate ipset entry '$cidr'\n";
3236                 next;
3237             }
3238
3239             $nethash->{$cidr} = $entry;
3240         }
3241
3242         foreach my $cidr (sort keys %$nethash) {
3243             my $entry = $nethash->{$cidr};
3244             my $line = $entry->{nomatch} ? '!' : '';
3245             $line .= $entry->{cidr};
3246             $line .= " # " . encode('utf8', $entry->{comment})
3247                 if $entry->{comment} && $entry->{comment} !~ m/^\s*$/;
3248             $raw .= "$line\n";
3249         }
3250
3251         $raw .= "\n";
3252     }
3253
3254     return $raw;
3255 };
3256
3257 sub save_vmfw_conf {
3258     my ($vmid, $vmfw_conf) = @_;
3259
3260     my $raw = '';
3261
3262     my $options = $vmfw_conf->{options};
3263     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3264
3265     my $aliases = $vmfw_conf->{aliases};
3266     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3267
3268     $raw .= &$format_ipsets($vmfw_conf) if $vmfw_conf->{ipset};
3269
3270     my $rules = $vmfw_conf->{rules} || [];
3271     if ($rules && scalar(@$rules)) {
3272         $raw .= "[RULES]\n\n";
3273         $raw .= &$format_rules($rules, 1);
3274         $raw .= "\n";
3275     }
3276
3277     my $filename = "$pvefw_conf_dir/$vmid.fw";
3278     if ($raw) {
3279         mkdir $pvefw_conf_dir;
3280         PVE::Tools::file_set_contents($filename, $raw);
3281     } else {
3282         unlink $filename;
3283     }
3284 }
3285
3286 sub remove_vmfw_conf {
3287     my ($vmid) = @_;
3288
3289     my $vmfw_conffile = "$pvefw_conf_dir/$vmid.fw";
3290
3291     unlink $vmfw_conffile;
3292 }
3293
3294 sub clone_vmfw_conf {
3295     my ($vmid, $newid) = @_;
3296
3297     my $sourcevm_conffile = "$pvefw_conf_dir/$vmid.fw";
3298     my $clonevm_conffile = "$pvefw_conf_dir/$newid.fw";
3299
3300     lock_vmfw_conf($newid, 10, sub {
3301         if (-f $clonevm_conffile) {
3302             unlink $clonevm_conffile;
3303         }
3304         if (-f $sourcevm_conffile) {
3305             my $data = PVE::Tools::file_get_contents($sourcevm_conffile);
3306             PVE::Tools::file_set_contents($clonevm_conffile, $data);
3307         }
3308     });
3309 }
3310
3311 sub read_vm_firewall_configs {
3312     my ($cluster_conf, $vmdata, $dir) = @_;
3313
3314     my $vmfw_configs = {};
3315
3316     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3317         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'vm', $vmid, $dir);
3318         next if !$vmfw_conf->{options}; # skip if file does not exist
3319         $vmfw_configs->{$vmid} = $vmfw_conf;
3320     }
3321     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3322         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'ct', $vmid, $dir);
3323         next if !$vmfw_conf->{options}; # skip if file does not exist
3324         $vmfw_configs->{$vmid} = $vmfw_conf;
3325     }
3326
3327     return $vmfw_configs;
3328 }
3329
3330 sub get_option_log_level {
3331     my ($options, $k) = @_;
3332
3333     my $v = $options->{$k};
3334     $v = $default_log_level if !defined($v);
3335
3336     return undef if $v eq '' || $v eq 'nolog';
3337
3338     return $v if defined($log_level_hash->{$v});
3339
3340     warn "unknown log level ($k = '$v')\n";
3341
3342     return undef;
3343 }
3344
3345 sub generate_std_chains {
3346     my ($ruleset, $options, $ipversion) = @_;
3347
3348     my $std_chains = $pve_std_chains->{$ipversion} || die "internal error";
3349
3350     my $loglevel = get_option_log_level($options, 'smurf_log_level');
3351     my $chain = 'PVEFW-smurflog';
3352     if ( $std_chains->{$chain} ) {
3353         foreach my $r (@{$std_chains->{$chain}}) {
3354           $r->{log} = $loglevel;
3355         }
3356     }
3357
3358     # same as shorewall logflags action.
3359     $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
3360     $chain = 'PVEFW-logflags';
3361     if ( $std_chains->{$chain} ) {
3362         foreach my $r (@{$std_chains->{$chain}}) {
3363           $r->{log} = $loglevel;
3364         }
3365     }
3366
3367     foreach my $chain (keys %$std_chains) {
3368         ruleset_create_chain($ruleset, $chain);
3369         foreach my $rule (@{$std_chains->{$chain}}) {
3370             if (ref($rule)) {
3371                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, 0);
3372             } else {
3373                 die "rule $rule as string - should not happen";
3374             }
3375         }
3376     }
3377 }
3378
3379 sub generate_ipset_chains {
3380     my ($ipset_ruleset, $clusterfw_conf, $fw_conf, $device_ips, $ipsets) = @_;
3381
3382     foreach my $ipset (keys %{$ipsets}) {
3383
3384         my $options = $ipsets->{$ipset};
3385
3386         if ($device_ips && $ipset =~ /^ipfilter-(net\d+)$/) {
3387             if (my $ips = $device_ips->{$1}) {
3388                 $options = [@$options, @$ips];
3389             }
3390         }
3391
3392         # remove duplicates
3393         my $nethash = {};
3394         foreach my $entry (@$options) {
3395             next if $entry->{errors}; # skip entries with errors
3396             eval {
3397                 my ($cidr, $ver);
3398                 if ($entry->{cidr} =~ m/^${ip_alias_pattern}$/) {
3399                     ($cidr, $ver) = resolve_alias($clusterfw_conf, $fw_conf, $entry->{cidr});
3400                 } else {
3401                     ($cidr, $ver) = parse_ip_or_cidr($entry->{cidr});
3402                 }
3403                 #http://backreference.org/2013/03/01/ipv6-address-normalization/
3404                 if ($ver == 6) {
3405                     # ip_compress_address takes an address only, no CIDR
3406                     my ($addr, $prefix_len) = ($cidr =~ m@^([^/]*)(/.*)?$@);
3407                     $cidr = lc(Net::IP::ip_compress_address($addr, 6));
3408                     $cidr .= $prefix_len if defined($prefix_len);
3409                     $cidr =~ s|/128$||;
3410                 } else {
3411                     $cidr =~ s|/32$||;
3412                 }
3413
3414                 $nethash->{$ver}->{$cidr} = { cidr => $cidr, nomatch => $entry->{nomatch} };
3415             };
3416             warn $@ if $@;
3417         }
3418
3419         foreach my $ipversion (4, 6) {
3420             my $data = $nethash->{$ipversion};
3421
3422             my $name = compute_ipset_chain_name($fw_conf->{vmid}, $ipset, $ipversion);
3423
3424             my $hashsize = scalar(@$options);
3425             if ($hashsize <= 64) {
3426                 $hashsize = 64;
3427             } else {
3428                 $hashsize = round_powerof2($hashsize);
3429             }
3430
3431             my $family = $ipversion == "6" ? "inet6" : "inet";
3432
3433             $ipset_ruleset->{$name} = ["create $name hash:net family $family hashsize $hashsize maxelem $hashsize"];
3434
3435             foreach my $cidr (sort keys %$data) {
3436                 my $entry = $data->{$cidr};
3437
3438                 my $cmd = "add $name $cidr";
3439                 if ($entry->{nomatch}) {
3440                     if ($feature_ipset_nomatch) {
3441                         push @{$ipset_ruleset->{$name}}, "$cmd nomatch";
3442                     } else {
3443                         warn "ignore !$cidr - nomatch not supported by kernel\n";
3444                     }
3445                 } else {
3446                     push @{$ipset_ruleset->{$name}}, $cmd;
3447                 }
3448             }
3449         }
3450     }
3451 }
3452
3453 sub round_powerof2 {
3454     my ($int) = @_;
3455
3456     $int--;
3457     $int |= $int >> $_ foreach (1,2,4,8,16);
3458     return ++$int;
3459 }
3460
3461 my $set_global_log_ratelimit = sub {
3462     my $cluster_opts = shift;
3463
3464     $global_log_ratelimit = '--limit 1/sec';
3465     if (defined(my $log_rlimit = $cluster_opts->{log_ratelimit})) {
3466         my $ll_format = $cluster_option_properties->{log_ratelimit}->{format};
3467         my $limit = PVE::JSONSchema::parse_property_string($ll_format, $log_rlimit);
3468
3469         if ($limit->{enable}) {
3470             if (my $rate = $limit->{rate}) {
3471                 $global_log_ratelimit = "--limit $rate";
3472             }
3473             if (my $burst = $limit->{burst}) {
3474                 $global_log_ratelimit .= " --limit-burst $burst";
3475             }
3476         } else {
3477             $global_log_ratelimit = undef;
3478         }
3479     }
3480 };
3481
3482 sub lock_clusterfw_conf {
3483     my ($timeout, $code, @param) = @_;
3484
3485     my $res = PVE::Cluster::cfs_lock_firewall("cluster", $timeout, $code, @param);
3486     die $@ if $@;
3487
3488     return $res;
3489 }
3490
3491 sub load_clusterfw_conf {
3492     my ($filename) = @_;
3493
3494     $filename = $clusterfw_conf_filename if !defined($filename);
3495     my $empty_conf = {
3496         rules => [],
3497         options => {},
3498         aliases => {},
3499         groups => {},
3500         group_comments => {},
3501         ipset => {} ,
3502         ipset_comments => {},
3503     };
3504
3505     my $cluster_conf = generic_fw_config_parser($filename, $empty_conf, $empty_conf, 'cluster');
3506     $set_global_log_ratelimit->($cluster_conf->{options});
3507
3508     return $cluster_conf;
3509 }
3510
3511 sub save_clusterfw_conf {
3512     my ($cluster_conf) = @_;
3513
3514     my $raw = '';
3515
3516     my $options = $cluster_conf->{options};
3517     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3518
3519     my $aliases = $cluster_conf->{aliases};
3520     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3521
3522     $raw .= &$format_ipsets($cluster_conf) if $cluster_conf->{ipset};
3523
3524     my $rules = $cluster_conf->{rules};
3525     if ($rules && scalar(@$rules)) {
3526         $raw .= "[RULES]\n\n";
3527         $raw .= &$format_rules($rules, 1);
3528         $raw .= "\n";
3529     }
3530
3531     if ($cluster_conf->{groups}) {
3532         foreach my $group (sort keys %{$cluster_conf->{groups}}) {
3533             my $rules = $cluster_conf->{groups}->{$group};
3534             if (my $comment = $cluster_conf->{group_comments}->{$group}) {
3535                 my $utf8comment = encode('utf8', $comment);
3536                 $raw .= "[group $group] # $utf8comment\n\n";
3537             } else {
3538                 $raw .= "[group $group]\n\n";
3539             }
3540
3541             $raw .= &$format_rules($rules, 0);
3542             $raw .= "\n";
3543         }
3544     }
3545
3546     if ($raw) {
3547         mkdir $pvefw_conf_dir;
3548         PVE::Tools::file_set_contents($clusterfw_conf_filename, $raw);
3549     } else {
3550         unlink $clusterfw_conf_filename;
3551     }
3552 }
3553
3554 sub lock_hostfw_conf {
3555     my ($timeout, $code, @param) = @_;
3556
3557     my $res = PVE::Cluster::cfs_lock_firewall("host-$nodename", $timeout, $code, @param);
3558     die $@ if $@;
3559
3560     return $res;
3561 }
3562
3563 sub load_hostfw_conf {
3564     my ($cluster_conf, $filename) = @_;
3565
3566     $filename = $hostfw_conf_filename if !defined($filename);
3567
3568     my $empty_conf = { rules => [], options => {}};
3569     return generic_fw_config_parser($filename, $cluster_conf, $empty_conf, 'host');
3570 }
3571
3572 sub save_hostfw_conf {
3573     my ($hostfw_conf) = @_;
3574
3575     my $raw = '';
3576
3577     my $options = $hostfw_conf->{options};
3578     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3579
3580     my $rules = $hostfw_conf->{rules};
3581     if ($rules && scalar(@$rules)) {
3582         $raw .= "[RULES]\n\n";
3583         $raw .= &$format_rules($rules, 1);
3584         $raw .= "\n";
3585     }
3586
3587     if ($raw) {
3588         PVE::Tools::file_set_contents($hostfw_conf_filename, $raw);
3589     } else {
3590         unlink $hostfw_conf_filename;
3591     }
3592 }
3593
3594 sub compile {
3595     my ($cluster_conf, $hostfw_conf, $vmdata, $corosync_conf) = @_;
3596
3597     my $vmfw_configs;
3598
3599     # fixme: once we read standard chains from config this needs to be put in test/standard cases below
3600     $pve_std_chains = dclone($pve_std_chains_conf);
3601
3602     if ($vmdata) { # test mode
3603         my $testdir = $vmdata->{testdir} || die "no test directory specified";
3604         my $filename = "$testdir/cluster.fw";
3605         $cluster_conf = load_clusterfw_conf($filename);
3606
3607         $filename = "$testdir/host.fw";
3608         $hostfw_conf = load_hostfw_conf($cluster_conf, $filename);
3609
3610         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, $testdir);
3611     } else { # normal operation
3612         $cluster_conf = load_clusterfw_conf(undef) if !$cluster_conf;
3613
3614         $hostfw_conf = load_hostfw_conf($cluster_conf, undef) if !$hostfw_conf;
3615
3616         # cfs_update is handled by daemon or API
3617         $corosync_conf = PVE::Cluster::cfs_read_file("corosync.conf")
3618             if !defined($corosync_conf) && PVE::Corosync::check_conf_exists(1);
3619
3620         $vmdata = read_local_vm_config();
3621         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, undef);
3622     }
3623
3624     return ({},{},{},{}) if !$cluster_conf->{options}->{enable};
3625
3626     my $localnet;
3627     if ($cluster_conf->{aliases}->{local_network}) {
3628         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3629     } else {
3630         my $localnet_ver;
3631         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3632
3633         $cluster_conf->{aliases}->{local_network} = {
3634             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3635     }
3636
3637     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3638
3639     my $ruleset = {};
3640     my $rulesetv6 = {};
3641     $ruleset->{filter} = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 4);
3642     $ruleset->{raw} = compile_iptables_raw($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 4);
3643     $rulesetv6->{filter} = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 6);
3644     $rulesetv6->{raw} = compile_iptables_raw($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 6);
3645     my $ebtables_ruleset = compile_ebtables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata);
3646     my $ipset_ruleset = compile_ipsets($cluster_conf, $vmfw_configs, $vmdata);
3647
3648     return ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
3649 }
3650
3651 sub compile_iptables_raw {
3652     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, $ipversion) = @_;
3653
3654     my $ruleset = {};
3655
3656     my $hostfw_options = $hostfw_conf->{options} || {};
3657     my $protection_synflood = $hostfw_options->{protection_synflood} || 0;
3658
3659     if($protection_synflood) {
3660
3661         my $protection_synflood_rate = $hostfw_options->{protection_synflood_rate} ? $hostfw_options->{protection_synflood_rate} : 200;
3662         my $protection_synflood_burst = $hostfw_options->{protection_synflood_burst} ? $hostfw_options->{protection_synflood_burst} : 1000;
3663         my $protection_synflood_limit = $hostfw_options->{protection_synflood_limit} ? $hostfw_options->{protection_synflood_limit} : 3000;
3664         my $protection_synflood_expire = $hostfw_options->{nf_conntrack_tcp_timeout_syn_recv} ? $hostfw_options->{nf_conntrack_tcp_timeout_syn_recv} : 60;
3665         $protection_synflood_expire = $protection_synflood_expire * 1000;
3666         my $protection_synflood_mask = $ipversion == 4 ? 32 : 64;
3667
3668         ruleset_create_chain($ruleset, "PVEFW-PREROUTING");
3669         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");
3670     }
3671
3672     return $ruleset;
3673 }
3674
3675 sub compile_iptables_filter {
3676     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, $ipversion) = @_;
3677
3678     my $ruleset = {};
3679
3680     ruleset_create_chain($ruleset, "PVEFW-INPUT");
3681     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
3682
3683     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3684
3685     my $hostfw_options = $hostfw_conf->{options} || {};
3686
3687     # fixme: what log level should we use here?
3688     my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
3689
3690     my $conn_allow_invalid = $hostfw_options->{nf_conntrack_allow_invalid} // 0;
3691     ruleset_chain_add_conn_filters($ruleset, "PVEFW-FORWARD", $conn_allow_invalid, "ACCEPT");
3692
3693     ruleset_create_chain($ruleset, "PVEFW-FWBR-IN");
3694     ruleset_chain_add_input_filters($ruleset, "PVEFW-FWBR-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
3695
3696     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-in fwln+", "-j PVEFW-FWBR-IN");
3697
3698     ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3699     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-out fwln+", "-j PVEFW-FWBR-OUT");
3700
3701     generate_std_chains($ruleset, $hostfw_options, $ipversion);
3702
3703     my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
3704
3705     if ($hostfw_enable) {
3706         eval { enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf, $ipversion, $corosync_conf); };
3707         warn $@ if $@; # just to be sure - should not happen
3708     }
3709
3710     # generate firewall rules for QEMU VMs
3711     foreach my $vmid (sort keys %{$vmdata->{qemu}}) {
3712         eval {
3713             my $conf = $vmdata->{qemu}->{$vmid};
3714             my $vmfw_conf = $vmfw_configs->{$vmid};
3715             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3716
3717             foreach my $netid (sort keys %$conf) {
3718                 next if $netid !~ m/^net(\d+)$/;
3719                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3720                 next if !$net->{firewall};
3721
3722                 my $iface = "tap${vmid}i$1";
3723                 my $macaddr = $net->{macaddr};
3724                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3725                                              $vmfw_conf, $vmid, 'IN', $ipversion);
3726                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3727                                              $vmfw_conf, $vmid, 'OUT', $ipversion);
3728             }
3729         };
3730         warn $@ if $@; # just to be sure - should not happen
3731     }
3732
3733     # generate firewall rules for LXC containers
3734     foreach my $vmid (sort keys %{$vmdata->{lxc}}) {
3735         eval {
3736             my $conf = $vmdata->{lxc}->{$vmid};
3737             my $vmfw_conf = $vmfw_configs->{$vmid};
3738             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3739
3740             foreach my $netid (sort keys %$conf) {
3741                 next if $netid !~ m/^net(\d+)$/;
3742                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3743                 next if !$net->{firewall};
3744
3745                 my $iface = "veth${vmid}i$1";
3746                 my $macaddr = $net->{hwaddr};
3747                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3748                                              $vmfw_conf, $vmid, 'IN', $ipversion);
3749                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3750                                              $vmfw_conf, $vmid, 'OUT', $ipversion);
3751             }
3752         };
3753         warn $@ if $@; # just to be sure - should not happen
3754     }
3755
3756     if (ruleset_chain_exist($ruleset, "PVEFW-IPS")){
3757         ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED", "-j PVEFW-IPS");
3758     }
3759
3760     return $ruleset;
3761 }
3762
3763 sub mac_to_linklocal {
3764     my ($macaddr) = @_;
3765     my @parts = split(/:/, $macaddr);
3766     # The standard link local address uses the fe80::/64 prefix with the
3767     # modified EUI-64 identifier derived from the MAC address by flipping the
3768     # universal/local bit and inserting FF:FE in the middle.
3769     # See RFC 4291.
3770     $parts[0] = sprintf("%02x", hex($parts[0]) ^ 0x02);
3771     my @meui64 = (@parts[0,1,2], 'ff', 'fe', @parts[3,4,5]);
3772     return "fe80::$parts[0]$parts[1]:$parts[2]FF:FE$parts[3]:$parts[4]$parts[5]";
3773 }
3774
3775 sub compile_ipsets {
3776     my ($cluster_conf, $vmfw_configs, $vmdata) = @_;
3777
3778     my $localnet;
3779     if ($cluster_conf->{aliases}->{local_network}) {
3780         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3781     } else {
3782         my $localnet_ver;
3783         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3784
3785         $cluster_conf->{aliases}->{local_network} = {
3786             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3787     }
3788
3789     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3790
3791
3792     my $ipset_ruleset = {};
3793
3794     # generate ipsets for QEMU VMs
3795     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3796         eval {
3797             my $conf = $vmdata->{qemu}->{$vmid};
3798             my $vmfw_conf = $vmfw_configs->{$vmid};
3799             return if !$vmfw_conf;
3800
3801             # When the 'ipfilter' option is enabled every device for which there
3802             # is no 'ipfilter-netX' ipset defiend gets an implicit empty default
3803             # ipset.
3804             # The reason is that ipfilter ipsets are always filled with standard
3805             # IPv6 link-local filters.
3806             my $ipsets = $vmfw_conf->{ipset};
3807             my $implicit_sets = {};
3808
3809             my $device_ips = {};
3810             foreach my $netid (keys %$conf) {
3811                 next if $netid !~ m/^net(\d+)$/;
3812                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3813                 next if !$net->{firewall};
3814
3815                 if ($vmfw_conf->{options}->{ipfilter} && !$ipsets->{"ipfilter-$netid"}) {
3816                     $implicit_sets->{"ipfilter-$netid"} = [];
3817                 }
3818
3819                 my $macaddr = $net->{macaddr};
3820                 my $linklocal = mac_to_linklocal($macaddr);
3821                 $device_ips->{$netid} = [
3822                     { cidr => $linklocal },
3823                     { cidr => 'fe80::/10', nomatch => 1 }
3824                 ];
3825             }
3826
3827             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $ipsets);
3828             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $implicit_sets);
3829         };
3830         warn $@ if $@; # just to be sure - should not happen
3831     }
3832
3833     # generate firewall rules for LXC containers
3834     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3835         eval {
3836             my $conf = $vmdata->{lxc}->{$vmid};
3837             my $vmfw_conf = $vmfw_configs->{$vmid};
3838             return if !$vmfw_conf;
3839
3840             # When the 'ipfilter' option is enabled every device for which there
3841             # is no 'ipfilter-netX' ipset defiend gets an implicit empty default
3842             # ipset.
3843             # The reason is that ipfilter ipsets are always filled with standard
3844             # IPv6 link-local filters, as well as the IP addresses configured
3845             # for the container.
3846             my $ipsets = $vmfw_conf->{ipset};
3847             my $implicit_sets = {};
3848
3849             my $device_ips = {};
3850             foreach my $netid (keys %$conf) {
3851                 next if $netid !~ m/^net(\d+)$/;
3852                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3853                 next if !$net->{firewall};
3854
3855                 if ($vmfw_conf->{options}->{ipfilter} && !$ipsets->{"ipfilter-$netid"}) {
3856                     $implicit_sets->{"ipfilter-$netid"} = [];
3857                 }
3858
3859                 my $macaddr = $net->{hwaddr};
3860                 my $linklocal = mac_to_linklocal($macaddr);
3861                 my $set = $device_ips->{$netid} = [
3862                     { cidr => $linklocal },
3863                     { cidr => 'fe80::/10', nomatch => 1 }
3864                 ];
3865                 if (defined($net->{ip}) && $net->{ip} =~ m!^($IPV4RE)(?:/\d+)?$!) {
3866                     push @$set, { cidr => $1 };
3867                 }
3868                 if (defined($net->{ip6}) && $net->{ip6} =~ m!^($IPV6RE)(?:/\d+)?$!) {
3869                     push @$set, { cidr => $1 };
3870                 }
3871             }
3872
3873             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $ipsets);
3874             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $implicit_sets);
3875         };
3876         warn $@ if $@; # just to be sure - should not happen
3877     }
3878
3879     generate_ipset_chains($ipset_ruleset, undef, $cluster_conf, undef, $cluster_conf->{ipset});
3880
3881     return $ipset_ruleset;
3882 }
3883
3884 sub compile_ebtables_filter {
3885     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata) = @_;
3886
3887     if (!($cluster_conf->{options}->{ebtables} // 1)) {
3888         return {};
3889     }
3890
3891     my $ruleset = {};
3892
3893     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3894
3895     ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3896     #for ipv4 and ipv6, check macaddress in iptables, so we use conntrack 'ESTABLISHED', to speedup rules
3897     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-p IPv4', '-j ACCEPT');
3898     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-p IPv6', '-j ACCEPT');
3899     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-o fwln+', '-j PVEFW-FWBR-OUT');
3900
3901     # generate firewall rules for QEMU VMs
3902     foreach my $vmid (sort keys %{$vmdata->{qemu}}) {
3903         eval {
3904             my $conf = $vmdata->{qemu}->{$vmid};
3905             my $vmfw_conf = $vmfw_configs->{$vmid};
3906             return if !$vmfw_conf;
3907             my $ipsets = $vmfw_conf->{ipset};
3908
3909             foreach my $netid (sort keys %$conf) {
3910                 next if $netid !~ m/^net(\d+)$/;
3911                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3912                 next if !$net->{firewall};
3913                 my $iface = "tap${vmid}i$1";
3914                 my $macaddr = $net->{macaddr};
3915                 my $arpfilter = [];
3916                 if (defined(my $ipset = $ipsets->{"ipfilter-$netid"})) {
3917                     foreach my $ipaddr (@$ipset) {
3918                         my($ip, $version) = parse_ip_or_cidr($ipaddr->{cidr});
3919                         next if !$ip || ($version && $version != 4);
3920                         push(@$arpfilter, $ip);
3921                     }
3922                 }
3923                 generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter);
3924             }
3925         };
3926         warn $@ if $@; # just to be sure - should not happen
3927     }
3928
3929     # generate firewall rules for LXC containers
3930     foreach my $vmid (sort keys %{$vmdata->{lxc}}) {
3931         eval {
3932             my $conf = $vmdata->{lxc}->{$vmid};
3933
3934             my $vmfw_conf = $vmfw_configs->{$vmid};
3935             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3936             my $ipsets = $vmfw_conf->{ipset};
3937
3938             foreach my $netid (sort keys %$conf) {
3939                 next if $netid !~ m/^net(\d+)$/;
3940                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3941                 next if !$net->{firewall};
3942                 my $iface = "veth${vmid}i$1";
3943                 my $macaddr = $net->{hwaddr};
3944                 my $arpfilter = [];
3945                 if (defined(my $ipset = $ipsets->{"ipfilter-$netid"})) {
3946                     foreach my $ipaddr (@$ipset) {
3947                         my($ip, $version) = parse_ip_or_cidr($ipaddr->{cidr});
3948                         next if !$ip || ($version && $version != 4);
3949                         push(@$arpfilter, $ip);
3950                     }
3951                 }
3952                 if (defined(my $ip = $net->{ip}) && $vmfw_conf->{options}->{ipfilter}) {
3953                     # ebtables changes this to a .0/MASK network but we just
3954                     # want the address here, no network - see #2193
3955                     $ip =~ s|/(\d+)$||;
3956                     if ($ip ne 'dhcp') {
3957                         push @$arpfilter, $ip;
3958                     }
3959                 }
3960                 generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter);
3961             }
3962         };
3963         warn $@ if $@; # just to be sure - should not happen
3964     }
3965
3966     return $ruleset;
3967 }
3968
3969 sub generate_tap_layer2filter {
3970     my ($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter) = @_;
3971     my $options = $vmfw_conf->{options};
3972
3973     my $tapchain = $iface."-OUT";
3974
3975     # ebtables remove zeros from mac pairs
3976     $macaddr =~ s/0([0-9a-f])/$1/ig;
3977     $macaddr = lc($macaddr);
3978
3979     ruleset_create_chain($ruleset, $tapchain);
3980
3981     if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
3982             ruleset_addrule($ruleset, $tapchain, "-s ! $macaddr", '-j DROP');
3983     }
3984
3985     if (@$arpfilter){
3986         my $arpchain = $tapchain."-ARP";
3987         ruleset_addrule($ruleset, $tapchain, "-p ARP", "-j $arpchain");
3988         ruleset_create_chain($ruleset, $arpchain);
3989
3990         foreach my $ip (@{$arpfilter}) {
3991             ruleset_addrule($ruleset, $arpchain, "-p ARP --arp-ip-src $ip", '-j RETURN');
3992         }
3993         ruleset_addrule($ruleset, $arpchain, '', '-j DROP');
3994     }
3995
3996     if (defined($options->{layer2_protocols})){
3997         my $protochain = $tapchain."-PROTO";
3998         ruleset_addrule($ruleset, $tapchain, '', "-j $protochain");
3999         ruleset_create_chain($ruleset, $protochain);
4000
4001         foreach my $proto (split(/,/, $options->{layer2_protocols})) {
4002             ruleset_addrule($ruleset, $protochain, "-p $proto", '-j RETURN');
4003         }
4004         ruleset_addrule($ruleset, $protochain, '', '-j DROP');
4005     }
4006
4007     ruleset_addrule($ruleset, $tapchain, '', '-j ACCEPT');
4008
4009     ruleset_addrule($ruleset, 'PVEFW-FWBR-OUT', "-i $iface", "-j $tapchain");
4010 }
4011
4012 # the parameter $change_only_regex changes two things if defined:
4013 # * all chains not matching it will be left intact
4014 # * both the $active_chains hash and the returned status_hash have different
4015 #   structure (they contain a key named 'rules').
4016 sub get_ruleset_status {
4017     my ($ruleset, $active_chains, $digest_fn, $change_only_regex) = @_;
4018
4019     my $statushash = {};
4020
4021     foreach my $chain (sort keys %$ruleset) {
4022         my $rules = $ruleset->{$chain};
4023         my $sig = &$digest_fn($rules);
4024         my $oldsig;
4025
4026         $statushash->{$chain}->{sig} = $sig;
4027         if (defined($change_only_regex)) {
4028             $oldsig = $active_chains->{$chain}->{sig};
4029             $statushash->{$chain}->{rules} = $rules;
4030         } else {
4031             $oldsig = $active_chains->{$chain};
4032         }
4033         if (!defined($oldsig)) {
4034             $statushash->{$chain}->{action} = 'create';
4035         } else {
4036             if ($oldsig eq $sig) {
4037                 $statushash->{$chain}->{action} = 'exists';
4038             } else {
4039                 $statushash->{$chain}->{action} = 'update';
4040             }
4041         }
4042         if ($verbose) {
4043             print "$statushash->{$chain}->{action} $chain ($sig)\n";
4044             foreach my $cmd (@{$rules}) {
4045                 print "\t$cmd\n";
4046             }
4047         }
4048     }
4049
4050     foreach my $chain (sort keys %$active_chains) {
4051         next if defined($ruleset->{$chain});
4052         my $action = 'delete';
4053         my $sig = $active_chains->{$chain};
4054         if (defined($change_only_regex)) {
4055             $action = 'ignore' if ($chain !~ m/$change_only_regex/);
4056             $statushash->{$chain}->{rules} = $active_chains->{$chain}->{rules};
4057             $sig = $sig->{sig};
4058         }
4059         $statushash->{$chain}->{action} = $action;
4060         $statushash->{$chain}->{sig} = $sig;
4061         print "$action $chain ($sig)\n" if $verbose;
4062     }
4063
4064     return $statushash;
4065 }
4066
4067 sub print_sig_rule {
4068     my ($chain, $sig) = @_;
4069
4070     # We just use this to store a SHA1 checksum used to detect changes
4071     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
4072 }
4073
4074 sub get_ruleset_cmdlist {
4075     my ($ruleset, $iptablescmd, $table) = @_;
4076
4077     $table = 'filter' if !$table;
4078
4079     my $cmdlist = "*$table\n"; # we pass this to iptables-restore;
4080
4081     my ($active_chains, $hooks) = iptables_get_chains($iptablescmd, $table);
4082     my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest);
4083
4084     # create missing chains first
4085     foreach my $chain (sort keys %$ruleset) {
4086         my $stat = $statushash->{$chain};
4087         die "internal error" if !$stat;
4088         next if $stat->{action} ne 'create';
4089
4090         $cmdlist .= ":$chain - [0:0]\n";
4091     }
4092
4093     foreach my $h (qw(INPUT OUTPUT FORWARD PREROUTING)) {
4094         my $chain = "PVEFW-$h";
4095         if ($ruleset->{$chain} && !$hooks->{$h}) {
4096             $cmdlist .= "-A $h -j $chain\n";
4097         }
4098     }
4099
4100     foreach my $chain (sort keys %$ruleset) {
4101         my $stat = $statushash->{$chain};
4102         die "internal error" if !$stat;
4103
4104         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
4105             $cmdlist .= "-F $chain\n";
4106             foreach my $cmd (@{$ruleset->{$chain}}) {
4107                 $cmdlist .= "$cmd\n";
4108             }
4109             $cmdlist .= print_sig_rule($chain, $stat->{sig});
4110         } elsif ($stat->{action} eq 'delete') {
4111             die "internal error"; # this should not happen
4112         } elsif ($stat->{action} eq 'exists') {
4113             # do nothing
4114         } else {
4115             die "internal error - unknown status '$stat->{action}'";
4116         }
4117     }
4118
4119     foreach my $chain (keys %$statushash) {
4120         next if $statushash->{$chain}->{action} ne 'delete';
4121         $cmdlist .= "-F $chain\n";
4122     }
4123     foreach my $chain (keys %$statushash) {
4124         next if $statushash->{$chain}->{action} ne 'delete';
4125         next if $chain eq 'PVEFW-INPUT';
4126         next if $chain eq 'PVEFW-OUTPUT';
4127         next if $chain eq 'PVEFW-FORWARD';
4128         next if $chain eq 'PVEFW-PREROUTING';
4129         $cmdlist .= "-X $chain\n";
4130     }
4131
4132     my $changes = $cmdlist ne "*$table\n" ? 1 : 0;
4133
4134     $cmdlist .= "COMMIT\n";
4135
4136     return wantarray ? ($cmdlist, $changes) : $cmdlist;
4137 }
4138
4139 my $pve_ebtables_chainname_regex = qr/PVEFW-\S+|(?:tap|veth)\d+i\d+-(?:IN|OUT)/;
4140
4141 sub get_ebtables_cmdlist {
4142     my ($ruleset) = @_;
4143
4144     my $changes = 0;
4145     my $cmdlist = "*filter\n";
4146
4147     my $active_chains = ebtables_get_chains();
4148     my $statushash = get_ruleset_status($ruleset, $active_chains,
4149                                         \&iptables_chain_digest,
4150                                         $pve_ebtables_chainname_regex);
4151
4152     # create chains first and make sure PVE rules are evaluated if active
4153     my $append_pve_to_forward = '-A FORWARD -j PVEFW-FORWARD';
4154     my $pve_include = 0;
4155     foreach my $chain (sort keys %$statushash) {
4156         next if ($statushash->{$chain}->{action} eq 'delete');
4157         $cmdlist .= ":$chain ACCEPT\n";
4158         $pve_include = 1 if ($chain eq 'PVEFW-FORWARD');
4159     }
4160
4161     foreach my $chain (sort keys %$statushash) {
4162         my $stat = $statushash->{$chain};
4163         $changes = 1 if ($stat->{action} !~ 'ignore|exists');
4164         next if ($stat->{action} eq 'delete');
4165
4166         foreach my $cmd (@{$statushash->{$chain}->{'rules'}}) {
4167             if ($chain eq 'FORWARD' && $cmd eq $append_pve_to_forward) {
4168                 next if ! $pve_include;
4169                 $pve_include = 0;
4170             }
4171             $cmdlist .= "$cmd\n";
4172         }
4173     }
4174     $cmdlist .= "$append_pve_to_forward\n" if $pve_include;
4175
4176     return wantarray ? ($cmdlist, $changes) : $cmdlist;
4177 }
4178
4179 sub get_ipset_cmdlist {
4180     my ($ruleset) = @_;
4181
4182     my $cmdlist = "";
4183
4184     my $delete_cmdlist = "";
4185
4186     my $active_chains = ipset_get_chains();
4187     my $statushash = get_ruleset_status($ruleset, $active_chains, \&ipset_chain_digest);
4188
4189     # remove stale _swap chains
4190     foreach my $chain (keys %$active_chains) {
4191         if ($chain =~ m/^PVEFW-\S+_swap$/) {
4192             $cmdlist .= "destroy $chain\n";
4193         }
4194     }
4195
4196     foreach my $chain (keys %$ruleset) {
4197         my $stat = $statushash->{$chain};
4198         die "internal error" if !$stat;
4199
4200         if ($stat->{action} eq 'create') {
4201             foreach my $cmd (@{$ruleset->{$chain}}) {
4202                 $cmdlist .= "$cmd\n";
4203             }
4204         }
4205     }
4206
4207     foreach my $chain (keys %$ruleset) {
4208         my $stat = $statushash->{$chain};
4209         die "internal error" if !$stat;
4210
4211         if ($stat->{action} eq 'update') {
4212             my $chain_swap = $chain."_swap";
4213
4214             foreach my $cmd (@{$ruleset->{$chain}}) {
4215                 $cmd =~ s/$chain/$chain_swap/;
4216                 $cmdlist .= "$cmd\n";
4217             }
4218             $cmdlist .= "swap $chain_swap $chain\n";
4219             $cmdlist .= "flush $chain_swap\n";
4220             $cmdlist .= "destroy $chain_swap\n";
4221         }
4222     }
4223
4224      # the remove unused chains
4225     foreach my $chain (keys %$statushash) {
4226         next if $statushash->{$chain}->{action} ne 'delete';
4227
4228         $delete_cmdlist .= "flush $chain\n";
4229         $delete_cmdlist .= "destroy $chain\n";
4230     }
4231
4232     my $changes = ($cmdlist || $delete_cmdlist) ? 1 : 0;
4233
4234     return ($cmdlist, $delete_cmdlist, $changes);
4235 }
4236
4237 sub apply_ruleset {
4238     my ($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $ebtables_ruleset) = @_;
4239
4240     enable_bridge_firewall();
4241
4242     my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
4243         get_ipset_cmdlist($ipset_ruleset);
4244
4245     my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset->{filter});
4246     my ($cmdlistv6, $changesv6) = get_ruleset_cmdlist($rulesetv6->{filter}, "ip6tables");
4247     my ($ebtables_cmdlist, $ebtables_changes) = get_ebtables_cmdlist($ebtables_ruleset);
4248     my ($cmdlist_raw, $changes_raw) = get_ruleset_cmdlist($ruleset->{raw}, undef, 'raw');
4249     my ($cmdlistv6_raw, $changesv6_raw) = get_ruleset_cmdlist($rulesetv6->{raw}, "ip6tables", 'raw');
4250
4251     if ($verbose) {
4252         if ($ipset_changes) {
4253             print "ipset changes:\n";
4254             print $ipset_create_cmdlist if $ipset_create_cmdlist;
4255             print $ipset_delete_cmdlist if $ipset_delete_cmdlist;
4256         }
4257
4258         if ($changes) {
4259             print "iptables changes:\n";
4260             print $cmdlist;
4261         }
4262
4263         if ($changesv6) {
4264             print "ip6tables changes:\n";
4265             print $cmdlistv6;
4266         }
4267
4268         if ($changes_raw) {
4269             print "iptables table raw changes:\n";
4270             print $cmdlist_raw;
4271         }
4272
4273         if ($changesv6_raw) {
4274             print "ip6tables table raw changes:\n";
4275             print $cmdlistv6_raw;
4276         }
4277
4278         if ($ebtables_changes) {
4279             print "ebtables changes:\n";
4280             print $ebtables_cmdlist;
4281         }
4282     }
4283
4284     my $tmpfile = "$pve_fw_status_dir/ipsetcmdlist1";
4285     PVE::Tools::file_set_contents($tmpfile, $ipset_create_cmdlist || '');
4286
4287     ipset_restore_cmdlist($ipset_create_cmdlist);
4288
4289     $tmpfile = "$pve_fw_status_dir/ip4cmdlist";
4290     PVE::Tools::file_set_contents($tmpfile, $cmdlist || '');
4291
4292     iptables_restore_cmdlist($cmdlist);
4293
4294     $tmpfile = "$pve_fw_status_dir/ip4cmdlistraw";
4295     PVE::Tools::file_set_contents($tmpfile, $cmdlist_raw || '');
4296
4297     iptables_restore_cmdlist($cmdlist_raw, 'raw');
4298
4299     $tmpfile = "$pve_fw_status_dir/ip6cmdlist";
4300     PVE::Tools::file_set_contents($tmpfile, $cmdlistv6 || '');
4301
4302     ip6tables_restore_cmdlist($cmdlistv6);
4303
4304     $tmpfile = "$pve_fw_status_dir/ip6cmdlistraw";
4305     PVE::Tools::file_set_contents($tmpfile, $cmdlistv6_raw || '');
4306
4307     ip6tables_restore_cmdlist($cmdlistv6_raw, 'raw');
4308
4309     $tmpfile = "$pve_fw_status_dir/ipsetcmdlist2";
4310     PVE::Tools::file_set_contents($tmpfile, $ipset_delete_cmdlist || '');
4311
4312     ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
4313
4314     ebtables_restore_cmdlist($ebtables_cmdlist);
4315
4316     $tmpfile = "$pve_fw_status_dir/ebtablescmdlist";
4317     PVE::Tools::file_set_contents($tmpfile, $ebtables_cmdlist || '');
4318
4319     # test: re-read status and check if everything is up to date
4320     my $ruleset_filter = $ruleset->{filter};
4321     my $active_chains = iptables_get_chains();
4322     my $statushash = get_ruleset_status($ruleset_filter, $active_chains, \&iptables_chain_digest);
4323
4324     my $errors;
4325     foreach my $chain (sort keys %$ruleset_filter) {
4326         my $stat = $statushash->{$chain};
4327         if ($stat->{action} ne 'exists') {
4328             warn "unable to update chain '$chain'\n";
4329             $errors = 1;
4330         }
4331     }
4332
4333     my $rulesetv6_filter = $rulesetv6->{filter};
4334     my $active_chainsv6 = iptables_get_chains("ip6tables");
4335     my $statushashv6 = get_ruleset_status($rulesetv6_filter, $active_chainsv6, \&iptables_chain_digest);
4336
4337     foreach my $chain (sort keys %$rulesetv6_filter) {
4338         my $stat = $statushashv6->{$chain};
4339         if ($stat->{action} ne 'exists') {
4340             warn "unable to update chain '$chain'\n";
4341             $errors = 1;
4342         }
4343     }
4344
4345     my $ruleset_raw = $ruleset->{raw};
4346     my $active_chains_raw = iptables_get_chains(undef, 'raw');
4347     my $statushash_raw = get_ruleset_status($ruleset_raw, $active_chains_raw, \&iptables_chain_digest);
4348
4349     foreach my $chain (sort keys %$ruleset_raw) {
4350         my $stat = $statushash_raw->{$chain};
4351         if ($stat->{action} ne 'exists') {
4352             warn "unable to update chain '$chain'\n";
4353             $errors = 1;
4354         }
4355     }
4356
4357     my $rulesetv6_raw = $rulesetv6->{raw};
4358     my $active_chainsv6_raw = iptables_get_chains("ip6tables", 'raw');
4359     my $statushashv6_raw = get_ruleset_status($rulesetv6_raw, $active_chainsv6_raw, \&iptables_chain_digest);
4360
4361     foreach my $chain (sort keys %$rulesetv6_raw) {
4362         my $stat = $statushashv6_raw->{$chain};
4363         if ($stat->{action} ne 'exists') {
4364             warn "unable to update chain '$chain'\n";
4365             $errors = 1;
4366         }
4367     }
4368
4369     my $active_ebtables_chains = ebtables_get_chains();
4370     my $ebtables_statushash = get_ruleset_status($ebtables_ruleset,
4371                                 $active_ebtables_chains, \&iptables_chain_digest,
4372                                 $pve_ebtables_chainname_regex);
4373
4374     foreach my $chain (sort keys %$ebtables_ruleset) {
4375         my $stat = $ebtables_statushash->{$chain};
4376         if ($stat->{action} ne 'exists') {
4377             warn "ebtables : unable to update chain '$chain'\n";
4378             $errors = 1;
4379         }
4380     }
4381
4382     die "unable to apply firewall changes\n" if $errors;
4383
4384     update_nf_conntrack_max($hostfw_conf);
4385
4386     update_nf_conntrack_tcp_timeout_established($hostfw_conf);
4387
4388     update_nf_conntrack_tcp_timeout_syn_recv($hostfw_conf);
4389
4390     update_nf_conntrack_logging($hostfw_conf);
4391 }
4392
4393 sub update_nf_conntrack_max {
4394     my ($hostfw_conf) = @_;
4395
4396     my $max = 262144; # reasonable default (2^16 * 4), see nf_conntrack-sysctl docs
4397
4398     my $options = $hostfw_conf->{options} || {};
4399
4400     if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
4401         $max = $options->{nf_conntrack_max};
4402         $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
4403     }
4404
4405     my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
4406     my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
4407
4408     my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
4409
4410     if ($current != $max) {
4411         my $hashsize = int($max/4);
4412         PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
4413         PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
4414     }
4415 }
4416
4417 sub update_nf_conntrack_tcp_timeout_established {
4418     my ($hostfw_conf) = @_;
4419
4420     my $options = $hostfw_conf->{options} || {};
4421
4422     my $value = defined($options->{nf_conntrack_tcp_timeout_established}) ? $options->{nf_conntrack_tcp_timeout_established} : 432000;
4423
4424     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established", $value);
4425 }
4426
4427 sub update_nf_conntrack_tcp_timeout_syn_recv {
4428     my ($hostfw_conf) = @_;
4429
4430     my $options = $hostfw_conf->{options} || {};
4431
4432     my $value = defined($options->{nf_conntrack_tcp_timeout_syn_recv}) ? $options->{nf_conntrack_tcp_timeout_syn_recev} : 60;
4433
4434     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_syn_recv", $value);
4435 }
4436
4437 my $log_nf_conntrack_enabled = undef;
4438 sub update_nf_conntrack_logging {
4439     my ($hostfw_conf) = @_;
4440
4441     my $options = $hostfw_conf->{options} || {};
4442     my $value = $options->{log_nf_conntrack} || 0;
4443     if (!defined($log_nf_conntrack_enabled)
4444         || $value != $log_nf_conntrack_enabled)
4445     {
4446         my $tmpfile = "$pve_fw_status_dir/log_nf_conntrack";
4447         PVE::Tools::file_set_contents($tmpfile, $value);
4448
4449         run_command([qw(systemctl try-reload-or-restart pvefw-logger.service)]);
4450         $log_nf_conntrack_enabled = $value;
4451     }
4452 }
4453
4454 sub remove_pvefw_chains {
4455
4456     PVE::Firewall::remove_pvefw_chains_iptables("iptables");
4457     PVE::Firewall::remove_pvefw_chains_iptables("ip6tables");
4458     PVE::Firewall::remove_pvefw_chains_iptables("iptables", "raw");
4459     PVE::Firewall::remove_pvefw_chains_iptables("ip6tables", "raw");
4460     PVE::Firewall::remove_pvefw_chains_ipset();
4461     PVE::Firewall::remove_pvefw_chains_ebtables();
4462
4463 }
4464
4465 sub remove_pvefw_chains_iptables {
4466     my ($iptablescmd, $table) = @_;
4467
4468     $table = 'filter' if !$table;
4469
4470     my ($chash, $hooks) = iptables_get_chains($iptablescmd, $table);
4471     my $cmdlist = "*$table\n";
4472
4473     foreach my $h (qw(INPUT OUTPUT FORWARD PREROUTING)) {
4474         if ($hooks->{$h}) {
4475             $cmdlist .= "-D $h -j PVEFW-$h\n";
4476         }
4477     }
4478
4479     foreach my $chain (keys %$chash) {
4480         $cmdlist .= "-F $chain\n";
4481     }
4482
4483     foreach my $chain (keys %$chash) {
4484         $cmdlist .= "-X $chain\n";
4485     }
4486     $cmdlist .= "COMMIT\n";
4487
4488     if($iptablescmd eq "ip6tables") {
4489         ip6tables_restore_cmdlist($cmdlist, $table);
4490     } else {
4491         iptables_restore_cmdlist($cmdlist, $table);
4492     }
4493 }
4494
4495 sub remove_pvefw_chains_ipset {
4496
4497     my $ipset_chains = ipset_get_chains();
4498
4499     my $cmdlist = "";
4500
4501     foreach my $chain (keys %$ipset_chains) {
4502         $cmdlist .= "flush $chain\n";
4503         $cmdlist .= "destroy $chain\n";
4504     }
4505
4506     ipset_restore_cmdlist($cmdlist) if $cmdlist;
4507 }
4508
4509 sub remove_pvefw_chains_ebtables {
4510     # apply empty ruleset = remove all our chains
4511     ebtables_restore_cmdlist(get_ebtables_cmdlist({}));
4512 }
4513
4514 sub init {
4515     my $cluster_conf = load_clusterfw_conf();
4516     my $cluster_options = $cluster_conf->{options};
4517     my $enable = $cluster_options->{enable};
4518
4519     return if !$enable;
4520
4521     # load required modules here
4522 }
4523
4524 sub update {
4525     my $code = sub {
4526
4527         my $cluster_conf = load_clusterfw_conf();
4528         my $cluster_options = $cluster_conf->{options};
4529
4530         if (!$cluster_options->{enable}) {
4531             PVE::Firewall::remove_pvefw_chains();
4532             return;
4533         }
4534
4535         my $hostfw_conf = load_hostfw_conf($cluster_conf);
4536
4537         my ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset) = compile($cluster_conf, $hostfw_conf);
4538
4539         apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
4540     };
4541
4542     run_locked($code);
4543 }
4544
4545 1;