src/PVE/Firewall.pm

   1 package PVE::Firewall;
   2
   3 use warnings;
   4 use strict;
   5 use POSIX;
   6 use Data::Dumper;
   7 use Digest::SHA;
   8 use Socket qw(AF_INET6 inet_ntop inet_pton);
   9 use PVE::INotify;
  10 use PVE::Exception qw(raise raise_param_exc);
  11 use PVE::JSONSchema qw(register_standard_option get_standard_option);
  12 use PVE::Cluster;
  13 use PVE::ProcFSTools;
  14 use PVE::Tools qw($IPV4RE $IPV6RE);
  15 use PVE::Network;
  16 use PVE::SafeSyslog;
  17 use File::Basename;
  18 use File::Path;
  19 use IO::File;
  20 use Net::IP;
  21 use PVE::Tools qw(run_command lock_file dir_glob_foreach);
  22 use Encode;
  23 use Storable qw(dclone);
  24
  25 my $hostfw_conf_filename = "/etc/pve/local/host.fw";
  26 my $pvefw_conf_dir = "/etc/pve/firewall";
  27 my $clusterfw_conf_filename = "$pvefw_conf_dir/cluster.fw";
  28
  29 # dynamically include PVE::QemuServer and PVE::LXC
  30 # to avoid dependency problems
  31 my $have_qemu_server;
  32 eval {
  33     require PVE::QemuServer;
  34     require PVE::QemuConfig;
  35     $have_qemu_server = 1;
  36 };
  37
  38 my $have_lxc;
  39 eval {
  40     require PVE::LXC;
  41     $have_lxc = 1;
  42 };
  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
 131 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
 132
 133 my $default_log_level = 'nolog'; # avoid logs by default
 134
 135 my $log_level_hash = {
 136     debug => 7,
 137     info => 6,
 138     notice => 5,
 139     warning => 4,
 140     err => 3,
 141     crit => 2,
 142     alert => 1,
 143     emerg => 0,
 144 };
 145
 146 # %rule
 147 #
 148 # name => optional
 149 # enable => [0|1]
 150 # action =>
 151 # proto =>
 152 # sport => port[,port[,port]].. or port:port
 153 # dport => port[,port[,port]].. or port:port
 154 # log => optional, loglevel
 155 # logmsg => optional, logmsg - overwrites default
 156 # iface_in => incomin interface
 157 # iface_out => outgoing interface
 158 # match => optional, overwrites generation of match
 159 # target => optional, overwrites action
 160
 161 # we need to overwrite some macros for ipv6
 162 my $pve_ipv6fw_macros = {
 163     'Ping' => [
 164         { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
 165     ],
 166     'NeighborDiscovery' => [
 167         "IPv6 neighbor solicitation, neighbor and router advertisement",
 168         { action => 'PARAM', proto => 'icmpv6', dport => 'router-solicitation' },
 169         { action => 'PARAM', proto => 'icmpv6', dport => 'router-advertisement' },
 170         { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-solicitation' },
 171         { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-advertisement' },
 172     ],
 173     'DHCPv6' => [
 174         "DHCPv6 traffic",
 175         { action => 'PARAM', proto => 'udp', dport => '546:547', sport => '546:547' },
 176     ],
 177     'Trcrt' => [
 178         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 179         { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
 180     ],
 181  };
 182
 183 # imported/converted from: /usr/share/shorewall/macro.*
 184 my $pve_fw_macros = {
 185     'Amanda' => [
 186         "Amanda Backup",
 187         { action => 'PARAM', proto => 'udp', dport => '10080' },
 188         { action => 'PARAM', proto => 'tcp', dport => '10080' },
 189     ],
 190     'Auth' => [
 191         "Auth (identd) traffic",
 192         { action => 'PARAM', proto => 'tcp', dport => '113' },
 193     ],
 194     'BGP' => [
 195         "Border Gateway Protocol traffic",
 196         { action => 'PARAM', proto => 'tcp', dport => '179' },
 197     ],
 198     'BitTorrent' => [
 199         "BitTorrent traffic for BitTorrent 3.1 and earlier",
 200         { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
 201         { action => 'PARAM', proto => 'udp', dport => '6881' },
 202     ],
 203     'BitTorrent32' => [
 204         "BitTorrent traffic for BitTorrent 3.2 and later",
 205         { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
 206         { action => 'PARAM', proto => 'udp', dport => '6881' },
 207     ],
 208     'Ceph' => [
 209         "Ceph Storage Cluster traffic (Ceph Monitors, OSD & MDS Deamons)",
 210         { action => 'PARAM', proto => 'tcp', dport => '6789' },
 211         { action => 'PARAM', proto => 'tcp', dport => '6800:7300' },
 212     ],
 213     'CVS' => [
 214         "Concurrent Versions System pserver traffic",
 215         { action => 'PARAM', proto => 'tcp', dport => '2401' },
 216     ],
 217     'Citrix' => [
 218         "Citrix/ICA traffic (ICA, ICA Browser, CGP)",
 219         { action => 'PARAM', proto => 'tcp', dport => '1494' },
 220         { action => 'PARAM', proto => 'udp', dport => '1604' },
 221         { action => 'PARAM', proto => 'tcp', dport => '2598' },
 222     ],
 223     'DAAP' => [
 224         "Digital Audio Access Protocol traffic (iTunes, Rythmbox daemons)",
 225         { action => 'PARAM', proto => 'tcp', dport => '3689' },
 226         { action => 'PARAM', proto => 'udp', dport => '3689' },
 227     ],
 228     'DCC' => [
 229         "Distributed Checksum Clearinghouse spam filtering mechanism",
 230         { action => 'PARAM', proto => 'tcp', dport => '6277' },
 231     ],
 232     'DHCPfwd' => [
 233         "Forwarded DHCP traffic",
 234         { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
 235     ],
 236     'DNS' => [
 237         "Domain Name System traffic (upd and tcp)",
 238         { action => 'PARAM', proto => 'udp', dport => '53' },
 239         { action => 'PARAM', proto => 'tcp', dport => '53' },
 240     ],
 241     'Distcc' => [
 242         "Distributed Compiler service",
 243         { action => 'PARAM', proto => 'tcp', dport => '3632' },
 244     ],
 245     'FTP' => [
 246         "File Transfer Protocol",
 247         { action => 'PARAM', proto => 'tcp', dport => '21' },
 248     ],
 249     'Finger' => [
 250         "Finger protocol (RFC 742)",
 251         { action => 'PARAM', proto => 'tcp', dport => '79' },
 252     ],
 253     'GNUnet' => [
 254         "GNUnet secure peer-to-peer networking traffic",
 255         { action => 'PARAM', proto => 'tcp', dport => '2086' },
 256         { action => 'PARAM', proto => 'udp', dport => '2086' },
 257         { action => 'PARAM', proto => 'tcp', dport => '1080' },
 258         { action => 'PARAM', proto => 'udp', dport => '1080' },
 259     ],
 260     'GRE' => [
 261         "Generic Routing Encapsulation tunneling protocol",
 262         { action => 'PARAM', proto => '47' },
 263     ],
 264     'Git' => [
 265         "Git distributed revision control traffic",
 266         { action => 'PARAM', proto => 'tcp', dport => '9418' },
 267     ],
 268     'HKP' => [
 269         "OpenPGP HTTP keyserver protocol traffic",
 270         { action => 'PARAM', proto => 'tcp', dport => '11371' },
 271     ],
 272     'HTTP' => [
 273         "Hypertext Transfer Protocol (WWW)",
 274         { action => 'PARAM', proto => 'tcp', dport => '80' },
 275     ],
 276     'HTTPS' => [
 277         "Hypertext Transfer Protocol (WWW) over SSL",
 278         { action => 'PARAM', proto => 'tcp', dport => '443' },
 279     ],
 280     'ICPV2' => [
 281         "Internet Cache Protocol V2 (Squid) traffic",
 282         { action => 'PARAM', proto => 'udp', dport => '3130' },
 283     ],
 284     'ICQ' => [
 285         "AOL Instant Messenger traffic",
 286         { action => 'PARAM', proto => 'tcp', dport => '5190' },
 287     ],
 288     'IMAP' => [
 289         "Internet Message Access Protocol",
 290         { action => 'PARAM', proto => 'tcp', dport => '143' },
 291     ],
 292     'IMAPS' => [
 293         "Internet Message Access Protocol over SSL",
 294         { action => 'PARAM', proto => 'tcp', dport => '993' },
 295     ],
 296     'IPIP' => [
 297         "IPIP capsulation traffic",
 298         { action => 'PARAM', proto => '94' },
 299     ],
 300     'IPsec' => [
 301         "IPsec traffic",
 302         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 303         { action => 'PARAM', proto => '50' },
 304     ],
 305     'IPsecah' => [
 306         "IPsec authentication (AH) traffic",
 307         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 308         { action => 'PARAM', proto => '51' },
 309     ],
 310     'IPsecnat' => [
 311         "IPsec traffic and Nat-Traversal",
 312         { action => 'PARAM', proto => 'udp', dport => '500' },
 313         { action => 'PARAM', proto => 'udp', dport => '4500' },
 314         { action => 'PARAM', proto => '50' },
 315     ],
 316     'IRC' => [
 317         "Internet Relay Chat traffic",
 318         { action => 'PARAM', proto => 'tcp', dport => '6667' },
 319     ],
 320     'Jetdirect' => [
 321         "HP Jetdirect printing",
 322         { action => 'PARAM', proto => 'tcp', dport => '9100' },
 323     ],
 324     'L2TP' => [
 325         "Layer 2 Tunneling Protocol traffic",
 326         { action => 'PARAM', proto => 'udp', dport => '1701' },
 327     ],
 328     'LDAP' => [
 329         "Lightweight Directory Access Protocol traffic",
 330         { action => 'PARAM', proto => 'tcp', dport => '389' },
 331     ],
 332     'LDAPS' => [
 333         "Secure Lightweight Directory Access Protocol traffic",
 334         { action => 'PARAM', proto => 'tcp', dport => '636' },
 335     ],
 336     'MSNP' => [
 337         "Microsoft Notification Protocol",
 338         { action => 'PARAM', proto => 'tcp', dport => '1863' },
 339     ],
 340     'MSSQL' => [
 341         "Microsoft SQL Server",
 342         { action => 'PARAM', proto => 'tcp', dport => '1433' },
 343     ],
 344     'Mail' => [
 345         "Mail traffic (SMTP, SMTPS, Submission)",
 346         { action => 'PARAM', proto => 'tcp', dport => '25' },
 347         { action => 'PARAM', proto => 'tcp', dport => '465' },
 348         { action => 'PARAM', proto => 'tcp', dport => '587' },
 349     ],
 350     'MDNS' => [
 351         "Multicast DNS",
 352         { action => 'PARAM', proto => 'udp', dport => '5353' },
 353     ],
 354     'Munin' => [
 355         "Munin networked resource monitoring traffic",
 356         { action => 'PARAM', proto => 'tcp', dport => '4949' },
 357     ],
 358     'MySQL' => [
 359         "MySQL server",
 360         { action => 'PARAM', proto => 'tcp', dport => '3306' },
 361     ],
 362     'NNTP' => [
 363         "NNTP traffic (Usenet).",
 364         { action => 'PARAM', proto => 'tcp', dport => '119' },
 365     ],
 366     'NNTPS' => [
 367         "Encrypted NNTP traffic (Usenet)",
 368         { action => 'PARAM', proto => 'tcp', dport => '563' },
 369     ],
 370     'NTP' => [
 371         "Network Time Protocol (ntpd)",
 372         { action => 'PARAM', proto => 'udp', dport => '123' },
 373     ],
 374     'OSPF' => [
 375         "OSPF multicast traffic",
 376         { action => 'PARAM', proto => '89' },
 377     ],
 378     'OpenVPN' => [
 379         "OpenVPN traffic",
 380         { action => 'PARAM', proto => 'udp', dport => '1194' },
 381     ],
 382     'PCA' => [
 383         "Symantec PCAnywere (tm)",
 384         { action => 'PARAM', proto => 'udp', dport => '5632' },
 385         { action => 'PARAM', proto => 'tcp', dport => '5631' },
 386     ],
 387     'POP3' => [
 388         "POP3 traffic",
 389         { action => 'PARAM', proto => 'tcp', dport => '110' },
 390     ],
 391     'POP3S' => [
 392         "Encrypted POP3 traffic",
 393         { action => 'PARAM', proto => 'tcp', dport => '995' },
 394     ],
 395     'PPtP' => [
 396         "Point-to-Point Tunneling Protocol",
 397         { action => 'PARAM', proto => '47' },
 398         { action => 'PARAM', proto => 'tcp', dport => '1723' },
 399     ],
 400     'Ping' => [
 401         "ICMP echo request",
 402         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 403     ],
 404     'PostgreSQL' => [
 405         "PostgreSQL server",
 406         { action => 'PARAM', proto => 'tcp', dport => '5432' },
 407     ],
 408     'Printer' => [
 409         "Line Printer protocol printing",
 410         { action => 'PARAM', proto => 'tcp', dport => '515' },
 411     ],
 412     'RDP' => [
 413         "Microsoft Remote Desktop Protocol traffic",
 414         { action => 'PARAM', proto => 'tcp', dport => '3389' },
 415     ],
 416     'RIP' => [
 417         "Routing Information Protocol (bidirectional)",
 418         { action => 'PARAM', proto => 'udp', dport => '520' },
 419     ],
 420     'RNDC' => [
 421         "BIND remote management protocol",
 422         { action => 'PARAM', proto => 'tcp', dport => '953' },
 423     ],
 424     'Razor' => [
 425         "Razor Antispam System",
 426         { action => 'ACCEPT', proto => 'tcp', dport => '2703' },
 427     ],
 428     'Rdate' => [
 429         "Remote time retrieval (rdate)",
 430         { action => 'PARAM', proto => 'tcp', dport => '37' },
 431     ],
 432     'Rsync' => [
 433         "Rsync server",
 434         { action => 'PARAM', proto => 'tcp', dport => '873' },
 435     ],
 436     'SANE' => [
 437         "SANE network scanning",
 438         { action => 'PARAM', proto => 'tcp', dport => '6566' },
 439     ],
 440     'SMB' => [
 441         "Microsoft SMB traffic",
 442         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 443         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 444         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 445         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 446     ],
 447     'SMBswat' => [
 448         "Samba Web Administration Tool",
 449         { action => 'PARAM', proto => 'tcp', dport => '901' },
 450     ],
 451     'SMTP' => [
 452         "Simple Mail Transfer Protocol",
 453         { action => 'PARAM', proto => 'tcp', dport => '25' },
 454     ],
 455     'SMTPS' => [
 456         "Encrypted Simple Mail Transfer Protocol",
 457         { action => 'PARAM', proto => 'tcp', dport => '465' },
 458     ],
 459     'SNMP' => [
 460         "Simple Network Management Protocol",
 461         { action => 'PARAM', proto => 'udp', dport => '161:162' },
 462         { action => 'PARAM', proto => 'tcp', dport => '161' },
 463     ],
 464     'SPAMD' => [
 465         "Spam Assassin SPAMD traffic",
 466         { action => 'PARAM', proto => 'tcp', dport => '783' },
 467     ],
 468     'SSH' => [
 469         "Secure shell traffic",
 470         { action => 'PARAM', proto => 'tcp', dport => '22' },
 471     ],
 472     'SVN' => [
 473         "Subversion server (svnserve)",
 474         { action => 'PARAM', proto => 'tcp', dport => '3690' },
 475     ],
 476     'SixXS' => [
 477         "SixXS IPv6 Deployment and Tunnel Broker",
 478         { action => 'PARAM', proto => 'tcp', dport => '3874' },
 479         { action => 'PARAM', proto => 'udp', dport => '3740' },
 480         { action => 'PARAM', proto => '41' },
 481         { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
 482     ],
 483     'Squid' => [
 484         "Squid web proxy traffic",
 485         { action => 'PARAM', proto => 'tcp', dport => '3128' },
 486     ],
 487     'Submission' => [
 488         "Mail message submission traffic",
 489         { action => 'PARAM', proto => 'tcp', dport => '587' },
 490     ],
 491     'Syslog' => [
 492         "Syslog protocol (RFC 5424) traffic",
 493         { action => 'PARAM', proto => 'udp', dport => '514' },
 494         { action => 'PARAM', proto => 'tcp', dport => '514' },
 495     ],
 496     'TFTP' => [
 497         "Trivial File Transfer Protocol traffic",
 498         { action => 'PARAM', proto => 'udp', dport => '69' },
 499     ],
 500     'Telnet' => [
 501         "Telnet traffic",
 502         { action => 'PARAM', proto => 'tcp', dport => '23' },
 503     ],
 504     'Telnets' => [
 505         "Telnet over SSL",
 506         { action => 'PARAM', proto => 'tcp', dport => '992' },
 507     ],
 508     'Time' => [
 509         "RFC 868 Time protocol",
 510         { action => 'PARAM', proto => 'tcp', dport => '37' },
 511     ],
 512     'Trcrt' => [
 513         "Traceroute (for up to 30 hops) traffic",
 514         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 515         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 516     ],
 517     'VNC' => [
 518         "VNC traffic for VNC display's 0 - 99",
 519         { action => 'PARAM', proto => 'tcp', dport => '5900:5999' },
 520     ],
 521     'VNCL' => [
 522         "VNC traffic from Vncservers to Vncviewers in listen mode",
 523         { action => 'PARAM', proto => 'tcp', dport => '5500' },
 524     ],
 525     'Web' => [
 526         "WWW traffic (HTTP and HTTPS)",
 527         { action => 'PARAM', proto => 'tcp', dport => '80' },
 528         { action => 'PARAM', proto => 'tcp', dport => '443' },
 529     ],
 530     'Webcache' => [
 531         "Web Cache/Proxy traffic (port 8080)",
 532         { action => 'PARAM', proto => 'tcp', dport => '8080' },
 533     ],
 534     'Webmin' => [
 535         "Webmin traffic",
 536         { action => 'PARAM', proto => 'tcp', dport => '10000' },
 537     ],
 538     'Whois' => [
 539         "Whois (nicname, RFC 3912) traffic",
 540         { action => 'PARAM', proto => 'tcp', dport => '43' },
 541     ],
 542 };
 543
 544 my $pve_fw_parsed_macros;
 545 my $pve_fw_macro_descr;
 546 my $pve_fw_macro_ipversion = {};
 547 my $pve_fw_preferred_macro_names = {};
 548
 549 my $FWACCEPTMARK_ON  = "0x80000000/0x80000000";
 550 my $FWACCEPTMARK_OFF = "0x00000000/0x80000000";
 551
 552 my $pve_std_chains = {};
 553 my $pve_std_chains_conf = {};
 554 $pve_std_chains_conf->{4} = {
 555     'PVEFW-SET-ACCEPT-MARK' => [
 556         { target => "-j MARK --set-mark $FWACCEPTMARK_ON" },
 557     ],
 558     'PVEFW-DropBroadcast' => [
 559         # same as shorewall 'Broadcast'
 560         # simply DROP BROADCAST/MULTICAST/ANYCAST
 561         # we can use this to reduce logging
 562         { action => 'DROP', dsttype => 'BROADCAST' },
 563         { action => 'DROP', dsttype => 'MULTICAST' },
 564         { action => 'DROP', dsttype => 'ANYCAST' },
 565         { action => 'DROP', dest => '224.0.0.0/4' },
 566     ],
 567     'PVEFW-reject' => [
 568         # same as shorewall 'reject'
 569         { action => 'DROP', dsttype => 'BROADCAST' },
 570         { action => 'DROP', source => '224.0.0.0/4' },
 571         { action => 'DROP', proto => 'icmp' },
 572         { match => '-p tcp', target => '-j REJECT --reject-with tcp-reset' },
 573         { match => '-p udp', target => '-j REJECT --reject-with icmp-port-unreachable' },
 574         { match => '-p icmp', target => '-j REJECT --reject-with icmp-host-unreachable' },
 575         { target => '-j REJECT --reject-with icmp-host-prohibited' },
 576     ],
 577     'PVEFW-Drop' => [
 578         # same as shorewall 'Drop', which is equal to DROP,
 579         # but REJECT/DROP some packages to reduce logging,
 580         # and ACCEPT critical ICMP types
 581         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 582         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 583         { action => 'PVEFW-DropBroadcast' },
 584         # ACCEPT critical ICMP types
 585         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 586         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 587         # Drop packets with INVALID state
 588         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 589         # Drop Microsoft SMB noise
 590         { action => 'DROP', proto => 'udp', dport => '135,445' },
 591         { action => 'DROP', proto => 'udp', dport => '137:139' },
 592         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 593         { action => 'DROP', proto => 'tcp', dport => '135,139,445' },
 594         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 595         # Drop new/NotSyn traffic so that it doesn't get logged
 596         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 597         # Drop DNS replies
 598         { action => 'DROP', proto => 'udp', sport => 53 },
 599     ],
 600     'PVEFW-Reject' => [
 601         # same as shorewall 'Reject', which is equal to Reject,
 602         # but REJECT/DROP some packages to reduce logging,
 603         # and ACCEPT critical ICMP types
 604         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 605         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 606         { action => 'PVEFW-DropBroadcast' },
 607         # ACCEPT critical ICMP types
 608         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 609         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 610         # Drop packets with INVALID state
 611         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 612         # Drop Microsoft SMB noise
 613         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445' },
 614         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
 615         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 616         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445' },
 617         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 618         # Drop new/NotSyn traffic so that it doesn't get logged
 619         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 620         # Drop DNS replies
 621         { action => 'DROP', proto => 'udp', sport => 53 },
 622     ],
 623     'PVEFW-tcpflags' => [
 624         # same as shorewall tcpflags action.
 625         # Packets arriving on this interface are checked for som illegal combinations of TCP flags
 626         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG', target => '-g PVEFW-logflags' },
 627         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE', target => '-g PVEFW-logflags' },
 628         { match => '-p tcp -m tcp --tcp-flags SYN,RST SYN,RST', target => '-g PVEFW-logflags' },
 629         { match => '-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN', target => '-g PVEFW-logflags' },
 630         { match => '-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN', target => '-g PVEFW-logflags' },
 631     ],
 632     'PVEFW-smurfs' => [
 633         # same as shorewall smurfs action
 634         # Filter packets for smurfs (packets with a broadcast address as the source).
 635         { match => '-s 0.0.0.0/32', target => '-j RETURN' }, # allow DHCP
 636         { match => '-m addrtype --src-type BROADCAST', target => '-g PVEFW-smurflog' },
 637         { match => '-s 224.0.0.0/4', target => '-g PVEFW-smurflog' },
 638     ],
 639     'PVEFW-smurflog' => [
 640         { action => 'DROP', logmsg => 'DROP: ' },
 641     ],
 642     'PVEFW-logflags' => [
 643         { action => 'DROP', logmsg => 'DROP: ' },
 644     ],
 645 };
 646
 647 $pve_std_chains_conf->{6} = {
 648     'PVEFW-SET-ACCEPT-MARK' => [
 649         { target => "-j MARK --set-mark $FWACCEPTMARK_ON" },
 650     ],
 651     'PVEFW-DropBroadcast' => [
 652         # same as shorewall 'Broadcast'
 653         # simply DROP BROADCAST/MULTICAST/ANYCAST
 654         # we can use this to reduce logging
 655         #{ action => 'DROP', dsttype => 'BROADCAST' }, #no broadcast in ipv6
 656         # ipv6 addrtype does not work with kernel 2.6.32
 657         #{ action => 'DROP', dsttype => 'MULTICAST' },
 658         #{ action => 'DROP', dsttype => 'ANYCAST' },
 659         { action => 'DROP', dest => 'ff00::/8' },
 660         #{ action => 'DROP', dest => '224.0.0.0/4' },
 661     ],
 662     'PVEFW-reject' => [
 663         # same as shorewall 'reject'
 664         #{ action => 'DROP', dsttype => 'BROADCAST' },
 665         #{ action => 'DROP', source => '224.0.0.0/4' },
 666         { action => 'DROP', proto => 'icmpv6' },
 667         { match => '-p tcp', target => '-j REJECT --reject-with tcp-reset' },
 668         #"-p udp -j REJECT --reject-with icmp-port-unreachable",
 669         #"-p icmp -j REJECT --reject-with icmp-host-unreachable",
 670         #"-j REJECT --reject-with icmp-host-prohibited",
 671     ],
 672     'PVEFW-Drop' => [
 673         # same as shorewall 'Drop', which is equal to DROP,
 674         # but REJECT/DROP some packages to reduce logging,
 675         # and ACCEPT critical ICMP types
 676         { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
 677         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 678         { action => 'PVEFW-DropBroadcast' },
 679         # ACCEPT critical ICMP types
 680         { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
 681         { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
 682         { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
 683         # Drop packets with INVALID state
 684         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 685         # Drop Microsoft SMB noise
 686         { action => 'DROP', proto => 'udp', dport => '135,445' },
 687         { action => 'DROP', proto => 'udp', dport => '137:139'},
 688         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 689         { action => 'DROP', proto => 'tcp', dport => '135,139,445' },
 690         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 691         # Drop new/NotSyn traffic so that it doesn't get logged
 692         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 693         # Drop DNS replies
 694         { action => 'DROP', proto => 'udp', sport => 53 },
 695     ],
 696     'PVEFW-Reject' => [
 697         # same as shorewall 'Reject', which is equal to Reject,
 698         # but REJECT/DROP some packages to reduce logging,
 699         # and ACCEPT critical ICMP types
 700         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 701         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 702         { action => 'PVEFW-DropBroadcast' },
 703         # ACCEPT critical ICMP types
 704         { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
 705         { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
 706         { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
 707         # Drop packets with INVALID state
 708         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 709         # Drop Microsoft SMB noise
 710         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445' },
 711         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139' },
 712         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 713         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445' },
 714         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 715         # Drop new/NotSyn traffic so that it doesn't get logged
 716         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 717         # Drop DNS replies
 718         { action => 'DROP', proto => 'udp', sport => 53 },
 719     ],
 720     'PVEFW-tcpflags' => [
 721         # same as shorewall tcpflags action.
 722         # Packets arriving on this interface are checked for som illegal combinations of TCP flags
 723         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG', target => '-g PVEFW-logflags' },
 724         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE', target => '-g PVEFW-logflags' },
 725         { match => '-p tcp -m tcp --tcp-flags SYN,RST SYN,RST', target => '-g PVEFW-logflags' },
 726         { match => '-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN', target => '-g PVEFW-logflags' },
 727         { match => '-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN', target => '-g PVEFW-logflags' },
 728     ],
 729     'PVEFW-logflags' => [
 730         { action => 'DROP', logmsg => 'DROP: ' },
 731     ],
 732 };
 733
 734 # iptables -p icmp -h
 735 my $icmp_type_names = {
 736     any => 1,
 737     'echo-reply' => 1,
 738     'destination-unreachable' => 1,
 739     'network-unreachable' => 1,
 740     'host-unreachable' => 1,
 741     'protocol-unreachable' => 1,
 742     'port-unreachable' => 1,
 743     'fragmentation-needed' => 1,
 744     'source-route-failed' => 1,
 745     'network-unknown' => 1,
 746     'host-unknown' => 1,
 747     'network-prohibited' => 1,
 748     'host-prohibited' => 1,
 749     'TOS-network-unreachable' => 1,
 750     'TOS-host-unreachable' => 1,
 751     'communication-prohibited' => 1,
 752     'host-precedence-violation' => 1,
 753     'precedence-cutoff' => 1,
 754     'source-quench' => 1,
 755     'redirect' => 1,
 756     'network-redirect' => 1,
 757     'host-redirect' => 1,
 758     'TOS-network-redirect' => 1,
 759     'TOS-host-redirect' => 1,
 760     'echo-request' => 1,
 761     'router-advertisement' => 1,
 762     'router-solicitation' => 1,
 763     'time-exceeded' => 1,
 764     'ttl-zero-during-transit' => 1,
 765     'ttl-zero-during-reassembly' => 1,
 766     'parameter-problem' => 1,
 767     'ip-header-bad' => 1,
 768     'required-option-missing' => 1,
 769     'timestamp-request' => 1,
 770     'timestamp-reply' => 1,
 771     'address-mask-request' => 1,
 772     'address-mask-reply' => 1,
 773 };
 774
 775 # ip6tables -p icmpv6 -h
 776
 777 my $icmpv6_type_names = {
 778     'any' => 1,
 779     'destination-unreachable' => 1,
 780     'no-route' => 1,
 781     'communication-prohibited' => 1,
 782     'address-unreachable' => 1,
 783     'port-unreachable' => 1,
 784     'packet-too-big' => 1,
 785     'time-exceeded' => 1,
 786     'ttl-zero-during-transit' => 1,
 787     'ttl-zero-during-reassembly' => 1,
 788     'parameter-problem' => 1,
 789     'bad-header' => 1,
 790     'unknown-header-type' => 1,
 791     'unknown-option' => 1,
 792     'echo-request' => 1,
 793     'echo-reply' => 1,
 794     'router-solicitation' => 1,
 795     'router-advertisement' => 1,
 796     'neighbor-solicitation' => 1,
 797     'neighbour-solicitation' => 1,
 798     'neighbor-advertisement' => 1,
 799     'neighbour-advertisement' => 1,
 800     'redirect' => 1,
 801 };
 802
 803 sub init_firewall_macros {
 804
 805     $pve_fw_parsed_macros = {};
 806
 807     my $parse = sub {
 808         my ($k, $macro) = @_;
 809         my $lc_name = lc($k);
 810         $pve_fw_macro_ipversion->{$k} = 0;
 811         while (!ref($macro->[0])) {
 812             my $desc = shift @$macro;
 813             if ($desc eq 'ipv4only') {
 814                 $pve_fw_macro_ipversion->{$k} = 4;
 815             } elsif ($desc eq 'ipv6only') {
 816                 $pve_fw_macro_ipversion->{$k} = 6;
 817             } else {
 818                 $pve_fw_macro_descr->{$k} = $desc;
 819             }
 820         }
 821         $pve_fw_preferred_macro_names->{$lc_name} = $k;
 822         $pve_fw_parsed_macros->{$k} = $macro;
 823     };
 824
 825     foreach my $k (keys %$pve_fw_macros) {
 826         &$parse($k, $pve_fw_macros->{$k});
 827     }
 828
 829     foreach my $k (keys %$pve_ipv6fw_macros) {
 830         next if $pve_fw_parsed_macros->{$k};
 831         &$parse($k, $pve_ipv6fw_macros->{$k});
 832         $pve_fw_macro_ipversion->{$k} = 6;
 833     }
 834 }
 835
 836 init_firewall_macros();
 837
 838 sub get_macros {
 839     return wantarray ? ($pve_fw_parsed_macros, $pve_fw_macro_descr): $pve_fw_parsed_macros;
 840 }
 841
 842 my $etc_services;
 843
 844 sub get_etc_services {
 845
 846     return $etc_services if $etc_services;
 847
 848     my $filename = "/etc/services";
 849
 850     my $fh = IO::File->new($filename, O_RDONLY);
 851     if (!$fh) {
 852         warn "unable to read '$filename' - $!\n";
 853         return {};
 854     }
 855
 856     my $services = {};
 857
 858     while (my $line = <$fh>) {
 859         chomp ($line);
 860         next if $line =~m/^#/;
 861         next if ($line =~m/^\s*$/);
 862
 863         if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp|sctp).*$!) {
 864             $services->{byid}->{$2}->{name} = $1;
 865             $services->{byid}->{$2}->{port} = $2;
 866             $services->{byid}->{$2}->{$3} = 1;
 867             $services->{byname}->{$1} = $services->{byid}->{$2};
 868         }
 869     }
 870
 871     close($fh);
 872
 873     $etc_services = $services;
 874
 875
 876     return $etc_services;
 877 }
 878
 879 sub parse_protocol_file {
 880     my ($filename) = @_;
 881
 882     my $fh = IO::File->new($filename, O_RDONLY);
 883     if (!$fh) {
 884         warn "unable to read '$filename' - $!\n";
 885         return {};
 886     }
 887
 888     my $protocols = {};
 889
 890     while (my $line = <$fh>) {
 891         chomp ($line);
 892         next if $line =~m/^#/;
 893         next if ($line =~m/^\s*$/);
 894
 895         if ($line =~ m!^(\S+)\s+(\d+)(?:\s+.*)?$!) {
 896             $protocols->{byid}->{$2}->{name} = $1;
 897             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
 898         }
 899     }
 900
 901     close($fh);
 902
 903     return $protocols;
 904 }
 905
 906 my $etc_protocols;
 907
 908 sub get_etc_protocols {
 909     return $etc_protocols if $etc_protocols;
 910
 911     my $protocols = parse_protocol_file('/etc/protocols');
 912
 913     # add special case for ICMP v6
 914     $protocols->{byid}->{icmpv6}->{name} = "icmpv6";
 915     $protocols->{byname}->{icmpv6} = $protocols->{byid}->{icmpv6};
 916
 917     $etc_protocols = $protocols;
 918
 919     return $etc_protocols;
 920 }
 921
 922 my $etc_ethertypes;
 923
 924 sub get_etc_ethertypes {
 925     $etc_ethertypes = parse_protocol_file('/etc/ethertypes')
 926         if !$etc_ethertypes;
 927     return $etc_ethertypes;
 928 }
 929
 930 my $__local_network;
 931
 932 sub local_network {
 933     my ($new_value) = @_;
 934
 935     $__local_network = $new_value if defined($new_value);
 936
 937     return $__local_network if defined($__local_network);
 938
 939     eval {
 940         my $nodename = PVE::INotify::nodename();
 941
 942         my $ip = PVE::Cluster::remote_node_ip($nodename);
 943
 944         my $testip = Net::IP->new($ip);
 945
 946         my $isv6 = $testip->version == 6;
 947         my $routes = $isv6 ? PVE::ProcFSTools::read_proc_net_ipv6_route()
 948                            : PVE::ProcFSTools::read_proc_net_route();
 949         foreach my $entry (@$routes) {
 950             my $mask;
 951             if ($isv6) {
 952                 $mask = $entry->{prefix};
 953                 next if !$mask; # skip the default route...
 954             } else {
 955                 $mask = $PVE::Network::ipv4_mask_hash_localnet->{$entry->{mask}};
 956                 next if !defined($mask);
 957             }
 958             my $cidr = "$entry->{dest}/$mask";
 959             my $testnet = Net::IP->new($cidr);
 960             my $overlap = $testnet->overlaps($testip);
 961             if ($overlap == $Net::IP::IP_B_IN_A_OVERLAP ||
 962                 $overlap == $Net::IP::IP_IDENTICAL)
 963             {
 964                 $__local_network = $cidr;
 965                 return;
 966             }
 967         }
 968     };
 969     warn $@ if $@;
 970
 971     return $__local_network;
 972 }
 973
 974 # ipset names are limited to 31 characters,
 975 # and we use '-v4' or '-v6' to indicate IP versions,
 976 # and we use '_swap' suffix for atomic update,
 977 # for example PVEFW-${VMID}-${ipset_name}_swap
 978
 979 my $max_iptables_ipset_name_length = 31 - length("PVEFW-") - length("_swap");
 980
 981 sub compute_ipset_chain_name {
 982     my ($vmid, $ipset_name, $ipversion) = @_;
 983
 984     $vmid = 0 if !defined($vmid);
 985
 986     my $id = "$vmid-${ipset_name}-v$ipversion";
 987
 988     if (length($id) > $max_iptables_ipset_name_length) {
 989         $id = PVE::Tools::fnv31a_hex($id);
 990     }
 991
 992     return "PVEFW-$id";
 993 }
 994
 995 sub compute_ipfilter_ipset_name {
 996     my ($iface) = @_;
 997
 998     return "ipfilter-$iface";
 999 }
1000
1001 sub parse_address_list {
1002     my ($str) = @_;
1003
1004     if ($str =~ m/^(\+)(\S+)$/) { # ipset ref
1005         die "ipset name too long\n" if length($str) > ($max_ipset_name_length + 1);
1006         return;
1007     }
1008
1009     if ($str =~ m/^${ip_alias_pattern}$/) {
1010         die "alias name too long\n" if length($str) > $max_alias_name_length;
1011         return;
1012     }
1013
1014     my $count = 0;
1015     my $iprange = 0;
1016     my $ipversion;
1017
1018     my @elements = split(/,/, $str);
1019     die "extraneous commas in list\n" if $str ne join(',', @elements);
1020     foreach my $elem (@elements) {
1021         $count++;
1022         my $ip = Net::IP->new($elem);
1023         if (!$ip) {
1024             my $err = Net::IP::Error();
1025             die "invalid IP address: $err\n";
1026         }
1027         $iprange = 1 if $elem =~ m/-/;
1028
1029         my $new_ipversion = Net::IP::ip_is_ipv6($ip->ip()) ? 6 : 4;
1030
1031         die "detected mixed ipv4/ipv6 addresses in address list '$str'\n"
1032             if $ipversion && ($new_ipversion != $ipversion);
1033
1034         $ipversion = $new_ipversion;
1035     }
1036
1037     die "you can't use a range in a list\n" if $iprange && $count > 1;
1038
1039     return $ipversion;
1040 }
1041
1042 sub parse_port_name_number_or_range {
1043     my ($str, $dport) = @_;
1044
1045     my $services = PVE::Firewall::get_etc_services();
1046     my $count = 0;
1047     my $icmp_port = 0;
1048
1049     my @elements = split(/,/, $str);
1050     die "extraneous commas in list\n" if $str ne join(',', @elements);
1051     foreach my $item (@elements) {
1052         if ($item =~ m/^(\d+):(\d+)$/) {
1053             $count += 2;
1054             my ($port1, $port2) = ($1, $2);
1055             die "invalid port '$port1'\n" if $port1 > 65535;
1056             die "invalid port '$port2'\n" if $port2 > 65535;
1057         } elsif ($item =~ m/^(\d+)$/) {
1058             $count += 1;
1059             my $port = $1;
1060             die "invalid port '$port'\n" if $port > 65535;
1061         } else {
1062             if ($dport && $icmp_type_names->{$item}) {
1063                 $icmp_port = 1;
1064             } elsif ($dport && $icmpv6_type_names->{$item}) {
1065                 $icmp_port = 1;
1066             } else {
1067                 die "invalid port '$item'\n" if !$services->{byname}->{$item};
1068             }
1069         }
1070     }
1071
1072     die "ICPM ports not allowed in port range\n" if $icmp_port && $count > 0;
1073
1074     # I really don't like to use the word number here, but it's the only thing
1075     # that makes sense in a literal way. The range 1:100 counts as 2, not as
1076     # one and not as 100...
1077     die "too many entries in port list (> 15 numbers)\n"
1078         if $count > 15;
1079
1080     return (scalar(@elements) > 1);
1081 }
1082
1083 PVE::JSONSchema::register_format('pve-fw-sport-spec', \&pve_fw_verify_sport_spec);
1084 sub pve_fw_verify_sport_spec {
1085    my ($portstr) = @_;
1086
1087    parse_port_name_number_or_range($portstr, 0);
1088
1089    return $portstr;
1090 }
1091
1092 PVE::JSONSchema::register_format('pve-fw-dport-spec', \&pve_fw_verify_dport_spec);
1093 sub pve_fw_verify_dport_spec {
1094    my ($portstr) = @_;
1095
1096    parse_port_name_number_or_range($portstr, 1);
1097
1098    return $portstr;
1099 }
1100
1101 PVE::JSONSchema::register_format('pve-fw-addr-spec', \&pve_fw_verify_addr_spec);
1102 sub pve_fw_verify_addr_spec {
1103    my ($list) = @_;
1104
1105    parse_address_list($list);
1106
1107    return $list;
1108 }
1109
1110 PVE::JSONSchema::register_format('pve-fw-protocol-spec', \&pve_fw_verify_protocol_spec);
1111 sub pve_fw_verify_protocol_spec {
1112    my ($proto) = @_;
1113
1114    my $protocols = get_etc_protocols();
1115
1116    die "unknown protocol '$proto'\n" if $proto &&
1117        !(defined($protocols->{byname}->{$proto}) ||
1118          defined($protocols->{byid}->{$proto}));
1119
1120    return $proto;
1121 }
1122
1123
1124 # helper function for API
1125
1126 sub copy_opject_with_digest {
1127     my ($object) = @_;
1128
1129     my $sha = Digest::SHA->new('sha1');
1130
1131     my $res = {};
1132     foreach my $k (sort keys %$object) {
1133         my $v = $object->{$k};
1134         next if !defined($v);
1135         $res->{$k} = $v;
1136         $sha->add($k, ':', $v, "\n");
1137     }
1138
1139     my $digest = $sha->hexdigest;
1140
1141     $res->{digest} = $digest;
1142
1143     return wantarray ? ($res, $digest) : $res;
1144 }
1145
1146 sub copy_list_with_digest {
1147     my ($list) = @_;
1148
1149     my $sha = Digest::SHA->new('sha1');
1150
1151     my $res = [];
1152     foreach my $entry (@$list) {
1153         my $data = {};
1154         foreach my $k (sort keys %$entry) {
1155             my $v = $entry->{$k};
1156             next if !defined($v);
1157             $data->{$k} = $v;
1158             # Note: digest ignores refs ($rule->{errors})
1159             # since Digest::SHA expects a series of bytes,
1160             #  we have to encode the value here to prevent errors when
1161             #  using utf8 characters (eg. in comments)
1162             $sha->add($k, ':', encode_utf8($v), "\n") if !ref($v); ;
1163         }
1164         push @$res, $data;
1165     }
1166
1167     my $digest = $sha->hexdigest;
1168
1169     foreach my $entry (@$res) {
1170         $entry->{digest} = $digest;
1171     }
1172
1173     return wantarray ? ($res, $digest) : $res;
1174 }
1175
1176 our $cluster_option_properties = {
1177     enable => {
1178         description => "Enable or disable the firewall cluster wide.",
1179         type => 'integer',
1180         minimum => 0,
1181         optional => 1,
1182     },
1183     policy_in => {
1184         description => "Input policy.",
1185         type => 'string',
1186         optional => 1,
1187         enum => ['ACCEPT', 'REJECT', 'DROP'],
1188     },
1189     policy_out => {
1190         description => "Output policy.",
1191         type => 'string',
1192         optional => 1,
1193         enum => ['ACCEPT', 'REJECT', 'DROP'],
1194     },
1195 };
1196
1197 our $host_option_properties = {
1198     enable => {
1199         description => "Enable host firewall rules.",
1200         type => 'boolean',
1201         optional => 1,
1202     },
1203     log_level_in =>  get_standard_option('pve-fw-loglevel', {
1204         description => "Log level for incoming traffic." }),
1205     log_level_out =>  get_standard_option('pve-fw-loglevel', {
1206         description => "Log level for outgoing traffic." }),
1207     tcp_flags_log_level =>  get_standard_option('pve-fw-loglevel', {
1208         description => "Log level for illegal tcp flags filter." }),
1209     smurf_log_level =>  get_standard_option('pve-fw-loglevel', {
1210         description => "Log level for SMURFS filter." }),
1211     nosmurfs => {
1212         description => "Enable SMURFS filter.",
1213         type => 'boolean',
1214         optional => 1,
1215     },
1216     tcpflags => {
1217         description => "Filter illegal combinations of TCP flags.",
1218         type => 'boolean',
1219         optional => 1,
1220     },
1221     nf_conntrack_max => {
1222         description => "Maximum number of tracked connections.",
1223         type => 'integer',
1224         optional => 1,
1225         minimum => 32768,
1226     },
1227     nf_conntrack_tcp_timeout_established => {
1228         description => "Conntrack established timeout.",
1229         type => 'integer',
1230         optional => 1,
1231         minimum => 7875,
1232     },
1233     ndp => {
1234         description => "Enable NDP.",
1235         type => 'boolean',
1236         optional => 1,
1237     },
1238 };
1239
1240 our $vm_option_properties = {
1241     enable => {
1242         description => "Enable/disable firewall rules.",
1243         type => 'boolean',
1244         optional => 1,
1245     },
1246     macfilter => {
1247         description => "Enable/disable MAC address filter.",
1248         type => 'boolean',
1249         optional => 1,
1250     },
1251     dhcp => {
1252         description => "Enable DHCP.",
1253         type => 'boolean',
1254         optional => 1,
1255     },
1256     ndp => {
1257         description => "Enable NDP.",
1258         type => 'boolean',
1259         optional => 1,
1260     },
1261     radv => {
1262         description => "Allow sending Router Advertisement.",
1263         type => 'boolean',
1264         optional => 1,
1265     },
1266     ipfilter => {
1267         description => "Enable default IP filters. " .
1268            "This is equivalent to adding an empty ipfilter-net<id> ipset " .
1269            "for every interface. Such ipsets implicitly contain sane default " .
1270            "restrictions such as restricting IPv6 link local addresses to " .
1271            "the one derived from the interface's MAC address. For containers " .
1272            "the configured IP addresses will be implicitly added.",
1273         type => 'boolean',
1274         optional => 1,
1275     },
1276     policy_in => {
1277         description => "Input policy.",
1278         type => 'string',
1279         optional => 1,
1280         enum => ['ACCEPT', 'REJECT', 'DROP'],
1281     },
1282     policy_out => {
1283         description => "Output policy.",
1284         type => 'string',
1285         optional => 1,
1286         enum => ['ACCEPT', 'REJECT', 'DROP'],
1287     },
1288     log_level_in =>  get_standard_option('pve-fw-loglevel', {
1289         description => "Log level for incoming traffic." }),
1290     log_level_out =>  get_standard_option('pve-fw-loglevel', {
1291         description => "Log level for outgoing traffic." }),
1292
1293 };
1294
1295
1296 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.";
1297
1298 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.";
1299
1300 my $rule_properties = {
1301     pos => {
1302         description => "Update rule at position <pos>.",
1303         type => 'integer',
1304         minimum => 0,
1305         optional => 1,
1306     },
1307     digest => get_standard_option('pve-config-digest'),
1308     type => {
1309         description => "Rule type.",
1310         type => 'string',
1311         optional => 1,
1312         enum => ['in', 'out', 'group'],
1313     },
1314     action => {
1315         description => "Rule action ('ACCEPT', 'DROP', 'REJECT') or security group name.",
1316         type => 'string',
1317         optional => 1,
1318         pattern => $security_group_name_pattern,
1319         maxLength => 20,
1320         minLength => 2,
1321     },
1322     macro => {
1323         description => "Use predefined standard macro.",
1324         type => 'string',
1325         optional => 1,
1326         maxLength => 128,
1327     },
1328     iface => get_standard_option('pve-iface', {
1329         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.",
1330         optional => 1
1331     }),
1332     source => {
1333         description => "Restrict packet source address. $addr_list_descr",
1334         type => 'string', format => 'pve-fw-addr-spec',
1335         optional => 1,
1336     },
1337     dest => {
1338         description => "Restrict packet destination address. $addr_list_descr",
1339         type => 'string', format => 'pve-fw-addr-spec',
1340         optional => 1,
1341     },
1342     proto => {
1343         description => "IP protocol. You can use protocol names ('tcp'/'udp') or simple numbers, as defined in '/etc/protocols'.",
1344         type => 'string', format => 'pve-fw-protocol-spec',
1345         optional => 1,
1346     },
1347     enable => {
1348         description => "Flag to enable/disable a rule.",
1349         type => 'integer',
1350         minimum => 0,
1351         optional => 1,
1352     },
1353     sport => {
1354         description => "Restrict TCP/UDP source port. $port_descr",
1355         type => 'string', format => 'pve-fw-sport-spec',
1356         optional => 1,
1357     },
1358     dport => {
1359         description => "Restrict TCP/UDP destination port. $port_descr",
1360         type => 'string', format => 'pve-fw-dport-spec',
1361         optional => 1,
1362     },
1363     comment => {
1364         description => "Descriptive comment.",
1365         type => 'string',
1366         optional => 1,
1367     },
1368 };
1369
1370 sub add_rule_properties {
1371     my ($properties) = @_;
1372
1373     foreach my $k (keys %$rule_properties) {
1374         my $h = $rule_properties->{$k};
1375         # copy data, so that we can modify later without side effects
1376         foreach my $opt (keys %$h) { $properties->{$k}->{$opt} = $h->{$opt}; }
1377     }
1378
1379     return $properties;
1380 }
1381
1382 sub delete_rule_properties {
1383     my ($rule, $delete_str) = @_;
1384
1385     foreach my $opt (PVE::Tools::split_list($delete_str)) {
1386         raise_param_exc({ 'delete' => "no such property ('$opt')"})
1387             if !defined($rule_properties->{$opt});
1388         raise_param_exc({ 'delete' => "unable to delete required property '$opt'"})
1389             if $opt eq 'type' || $opt eq 'action';
1390         delete $rule->{$opt};
1391     }
1392
1393     return $rule;
1394 }
1395
1396 my $apply_macro = sub {
1397     my ($macro_name, $param, $verify, $ipversion) = @_;
1398
1399     my $macro_rules = $pve_fw_parsed_macros->{$macro_name};
1400     die "unknown macro '$macro_name'\n" if !$macro_rules; # should not happen
1401
1402     if ($ipversion && ($ipversion == 6) && $pve_ipv6fw_macros->{$macro_name}) {
1403         $macro_rules = $pve_ipv6fw_macros->{$macro_name};
1404     }
1405
1406     # skip macros which are specific to another ipversion
1407     if ($ipversion && (my $required = $pve_fw_macro_ipversion->{$macro_name})) {
1408         return if $ipversion != $required;
1409     }
1410
1411     my $rules = [];
1412
1413     foreach my $templ (@$macro_rules) {
1414         my $rule = {};
1415         my $param_used = {};
1416         foreach my $k (keys %$templ) {
1417             my $v = $templ->{$k};
1418             if ($v eq 'PARAM') {
1419                 $v = $param->{$k};
1420                 $param_used->{$k} = 1;
1421             } elsif ($v eq 'DEST') {
1422                 $v = $param->{dest};
1423                 $param_used->{dest} = 1;
1424             } elsif ($v eq 'SOURCE') {
1425                 $v = $param->{source};
1426                 $param_used->{source} = 1;
1427             }
1428
1429             if (!defined($v)) {
1430                 my $msg = "missing parameter '$k' in macro '$macro_name'";
1431                 raise_param_exc({ macro => $msg }) if $verify;
1432                 die "$msg\n";
1433             }
1434             $rule->{$k} = $v;
1435         }
1436         foreach my $k (keys %$param) {
1437             next if $k eq 'macro';
1438             next if !defined($param->{$k});
1439             next if $param_used->{$k};
1440             if (defined($rule->{$k})) {
1441                 if ($rule->{$k} ne $param->{$k}) {
1442                     my $msg = "parameter '$k' already define in macro (value = '$rule->{$k}')";
1443                     raise_param_exc({ $k => $msg }) if $verify;
1444                     die "$msg\n";
1445                 }
1446             } else {
1447                 $rule->{$k} = $param->{$k};
1448             }
1449         }
1450         push @$rules, $rule;
1451     }
1452
1453     return $rules;
1454 };
1455
1456 my $rule_env_iface_lookup = {
1457     'ct' => 1,
1458     'vm' => 1,
1459     'group' => 0,
1460     'cluster' => 1,
1461     'host' => 1,
1462 };
1463
1464 sub verify_rule {
1465     my ($rule, $cluster_conf, $fw_conf, $rule_env, $noerr) = @_;
1466
1467     my $allow_groups = $rule_env eq 'group' ? 0 : 1;
1468
1469     my $allow_iface = $rule_env_iface_lookup->{$rule_env};
1470     die "unknown rule_env '$rule_env'\n" if !defined($allow_iface); # should not happen
1471
1472     my $errors = $rule->{errors} || {};
1473
1474     my $error_count = 0;
1475
1476     my $add_error = sub {
1477         my ($param, $msg)  = @_;
1478         chomp $msg;
1479         raise_param_exc({ $param => $msg }) if !$noerr;
1480         $error_count++;
1481         $errors->{$param} = $msg if !$errors->{$param};
1482     };
1483
1484     my $ipversion;
1485     my $set_ip_version = sub {
1486         my $vers = shift;
1487         if ($vers) {
1488             die "detected mixed ipv4/ipv6 adresses in rule\n"
1489                 if $ipversion && ($vers != $ipversion);
1490             $ipversion = $vers;
1491         }
1492     };
1493
1494     my $check_ipset_or_alias_property = sub {
1495         my ($name, $expected_ipversion) = @_;
1496
1497         if (my $value = $rule->{$name}) {
1498             if ($value =~ m/^\+/) {
1499                 if ($value =~ m/^\+(${ipset_name_pattern})$/) {
1500                     &$add_error($name, "no such ipset '$1'")
1501                         if !($cluster_conf->{ipset}->{$1} || ($fw_conf && $fw_conf->{ipset}->{$1}));
1502
1503                 } else {
1504                     &$add_error($name, "invalid ipset name '$value'");
1505                 }
1506             } elsif ($value =~ m/^${ip_alias_pattern}$/){
1507                 my $alias = lc($value);
1508                 &$add_error($name, "no such alias '$value'")
1509                     if !($cluster_conf->{aliases}->{$alias} || ($fw_conf && $fw_conf->{aliases}->{$alias}));
1510                 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1511                 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1512
1513                 &$set_ip_version($e->{ipversion});
1514             }
1515         }
1516     };
1517
1518     my $type = $rule->{type};
1519     my $action = $rule->{action};
1520
1521     &$add_error('type', "missing property") if !$type;
1522     &$add_error('action', "missing property") if !$action;
1523
1524     if ($type) {
1525         if ($type eq  'in' || $type eq 'out') {
1526             &$add_error('action', "unknown action '$action'")
1527                 if $action && ($action !~ m/^(ACCEPT|DROP|REJECT)$/);
1528         } elsif ($type eq 'group') {
1529             &$add_error('type', "security groups not allowed")
1530                 if !$allow_groups;
1531             &$add_error('action', "invalid characters in security group name")
1532                 if $action && ($action !~ m/^${security_group_name_pattern}$/);
1533         } else {
1534             &$add_error('type', "unknown rule type '$type'");
1535         }
1536     }
1537
1538     if ($rule->{iface}) {
1539         &$add_error('type', "parameter -i not allowed for this rule type")
1540             if !$allow_iface;
1541         eval { PVE::JSONSchema::pve_verify_iface($rule->{iface}); };
1542         &$add_error('iface', $@) if $@;
1543         if ($rule_env eq 'vm' || $rule_env eq 'ct') {
1544             &$add_error('iface', "value does not match the regex pattern 'net\\d+'")
1545                 if $rule->{iface} !~  m/^net(\d+)$/;
1546         }
1547     }
1548
1549     if ($rule->{macro}) {
1550         if (my $preferred_name = $pve_fw_preferred_macro_names->{lc($rule->{macro})}) {
1551             $rule->{macro} = $preferred_name;
1552         } else {
1553             &$add_error('macro', "unknown macro '$rule->{macro}'");
1554         }
1555     }
1556
1557     if ($rule->{proto}) {
1558         eval { pve_fw_verify_protocol_spec($rule->{proto}); };
1559         &$add_error('proto', $@) if $@;
1560         &$set_ip_version(4) if $rule->{proto} eq 'icmp';
1561         &$set_ip_version(6) if $rule->{proto} eq 'icmpv6';
1562     }
1563
1564     if ($rule->{dport}) {
1565         eval { parse_port_name_number_or_range($rule->{dport}, 1); };
1566         &$add_error('dport', $@) if $@;
1567         my $proto = $rule->{proto};
1568         &$add_error('proto', "missing property - 'dport' requires this property")
1569             if !$proto;
1570         &$add_error('dport', "protocol '$proto' does not support ports")
1571             if !$PROTOCOLS_WITH_PORTS->{$proto} &&
1572                 $proto ne 'icmp' && $proto ne 'icmpv6'; # special cases
1573     }
1574
1575     if ($rule->{sport}) {
1576         eval { parse_port_name_number_or_range($rule->{sport}, 0); };
1577         &$add_error('sport', $@) if $@;
1578         my $proto = $rule->{proto};
1579         &$add_error('proto', "missing property - 'sport' requires this property")
1580             if !$proto;
1581         &$add_error('sport', "protocol '$proto' does not support ports")
1582             if !$PROTOCOLS_WITH_PORTS->{$proto};
1583     }
1584
1585     if ($rule->{source}) {
1586         eval {
1587             my $source_ipversion = parse_address_list($rule->{source});
1588             &$set_ip_version($source_ipversion);
1589         };
1590         &$add_error('source', $@) if $@;
1591         &$check_ipset_or_alias_property('source', $ipversion);
1592     }
1593
1594     if ($rule->{dest}) {
1595         eval {
1596             my $dest_ipversion = parse_address_list($rule->{dest});
1597             &$set_ip_version($dest_ipversion);
1598         };
1599         &$add_error('dest', $@) if $@;
1600         &$check_ipset_or_alias_property('dest', $ipversion);
1601     }
1602
1603     $rule->{ipversion} = $ipversion if $ipversion;
1604
1605     if ($rule->{macro} && !$error_count) {
1606         eval { &$apply_macro($rule->{macro}, $rule, 1, $ipversion); };
1607         if (my $err = $@) {
1608             if (ref($err) eq "PVE::Exception" && $err->{errors}) {
1609                 my $eh = $err->{errors};
1610                 foreach my $p (keys %$eh) {
1611                     &$add_error($p, $eh->{$p});
1612                 }
1613             } else {
1614                 &$add_error('macro', "$err");
1615             }
1616         }
1617     }
1618
1619     $rule->{errors} = $errors if $error_count;
1620
1621     return $rule;
1622 }
1623
1624 sub copy_rule_data {
1625     my ($rule, $param) = @_;
1626
1627     foreach my $k (keys %$rule_properties) {
1628         if (defined(my $v = $param->{$k})) {
1629             if ($v eq '' || $v eq '-') {
1630                 delete $rule->{$k};
1631             } else {
1632                 $rule->{$k} = $v;
1633             }
1634         }
1635     }
1636
1637     return $rule;
1638 }
1639
1640 sub rules_modify_permissions {
1641     my ($rule_env) = @_;
1642
1643     if ($rule_env eq 'host') {
1644         return {
1645             check => ['perm', '/nodes/{node}', [ 'Sys.Modify' ]],
1646         };
1647     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1648         return {
1649             check => ['perm', '/', [ 'Sys.Modify' ]],
1650         };
1651     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1652         return {
1653             check => ['perm', '/vms/{vmid}', [ 'VM.Config.Network' ]],
1654         }
1655     }
1656
1657     return undef;
1658 }
1659
1660 sub rules_audit_permissions {
1661     my ($rule_env) = @_;
1662
1663     if ($rule_env eq 'host') {
1664         return {
1665             check => ['perm', '/nodes/{node}', [ 'Sys.Audit' ]],
1666         };
1667     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1668         return {
1669             check => ['perm', '/', [ 'Sys.Audit' ]],
1670         };
1671     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1672         return {
1673             check => ['perm', '/vms/{vmid}', [ 'VM.Audit' ]],
1674         }
1675     }
1676
1677     return undef;
1678 }
1679
1680 # core functions
1681 my $bridge_firewall_enabled = 0;
1682
1683 sub enable_bridge_firewall {
1684
1685     return if $bridge_firewall_enabled; # only once
1686
1687     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
1688     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
1689
1690     # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
1691     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
1692
1693     $bridge_firewall_enabled = 1;
1694 }
1695
1696 sub iptables_restore_cmdlist {
1697     my ($cmdlist) = @_;
1698
1699     run_command("/sbin/iptables-restore -n", input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1700 }
1701
1702 sub ip6tables_restore_cmdlist {
1703     my ($cmdlist) = @_;
1704
1705     run_command("/sbin/ip6tables-restore -n", input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1706 }
1707
1708 sub ipset_restore_cmdlist {
1709     my ($cmdlist) = @_;
1710
1711     run_command("/sbin/ipset restore", input => $cmdlist, errmsg => "ipset_restore_cmdlist");
1712 }
1713
1714 sub iptables_get_chains {
1715     my ($iptablescmd) = @_;
1716
1717     $iptablescmd = "iptables" if !$iptablescmd;
1718
1719     my $res = {};
1720
1721     # check what chains we want to track
1722     my $is_pvefw_chain = sub {
1723         my $name = shift;
1724
1725         return 1 if $name =~ m/^PVEFW-\S+$/;
1726
1727         return 1 if $name =~ m/^tap\d+i\d+-(?:IN|OUT)$/;
1728
1729         return 1 if $name =~ m/^veth\d+i\d+-(?:IN|OUT)$/;
1730
1731         return 1 if $name =~ m/^fwbr\d+(v\d+)?-(?:FW|IN|OUT|IPS)$/;
1732         return 1 if $name =~ m/^GROUP-(?:$security_group_name_pattern)-(?:IN|OUT)$/;
1733
1734         return undef;
1735     };
1736
1737     my $table = '';
1738
1739     my $hooks = {};
1740
1741     my $parser = sub {
1742         my $line = shift;
1743
1744         return if $line =~ m/^#/;
1745         return if $line =~ m/^\s*$/;
1746
1747         if ($line =~ m/^\*(\S+)$/) {
1748             $table = $1;
1749             return;
1750         }
1751
1752         return if $table ne 'filter';
1753
1754         if ($line =~ m/^:(\S+)\s/) {
1755             my $chain = $1;
1756             return if !&$is_pvefw_chain($chain);
1757             $res->{$chain} = "unknown";
1758         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
1759             my ($chain, $sig) = ($1, $2);
1760             return if !&$is_pvefw_chain($chain);
1761             $res->{$chain} = $sig;
1762         } elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD)\s+-j\s+PVEFW-\1$/) {
1763             $hooks->{$1} = 1;
1764         } else {
1765             # simply ignore the rest
1766             return;
1767         }
1768     };
1769
1770     run_command("/sbin/$iptablescmd-save", outfunc => $parser);
1771
1772     return wantarray ? ($res, $hooks) : $res;
1773 }
1774
1775 sub iptables_chain_digest {
1776     my ($rules) = @_;
1777     my $digest = Digest::SHA->new('sha1');
1778     foreach my $rule (@$rules) { # order is important
1779         $digest->add($rule);
1780     }
1781     return $digest->b64digest;
1782 }
1783
1784 sub ipset_chain_digest {
1785     my ($rules) = @_;
1786
1787     my $digest = Digest::SHA->new('sha1');
1788     foreach my $rule (sort @$rules) { # note: sorted
1789         $digest->add($rule);
1790     }
1791     return $digest->b64digest;
1792 }
1793
1794 sub ipset_get_chains {
1795
1796     my $res = {};
1797     my $chains = {};
1798
1799     my $parser = sub {
1800         my $line = shift;
1801
1802         return if $line =~ m/^#/;
1803         return if $line =~ m/^\s*$/;
1804         if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
1805             my $chain = $1;
1806             $line =~ s/\s+$//; # delete trailing white space
1807             push @{$chains->{$chain}}, $line;
1808         } else {
1809             # simply ignore the rest
1810             return;
1811         }
1812     };
1813
1814     run_command("/sbin/ipset save", outfunc => $parser);
1815
1816     # compute digest for each chain
1817     foreach my $chain (keys %$chains) {
1818         $res->{$chain} = ipset_chain_digest($chains->{$chain});
1819     }
1820
1821     return $res;
1822 }
1823
1824 # substitude action of rule according to action hash
1825 sub rule_substitude_action {
1826     my ($rule, $actions) = @_;
1827
1828     if (my $action = $rule->{action}) {
1829         $rule->{action} = $actions->{$action} if defined($actions->{$action});
1830     }
1831 }
1832
1833 # generate a src or dst match
1834 # $dir(ection) is either d or s
1835 sub ipt_gen_src_or_dst_match {
1836     my ($adr, $dir, $ipversion, $cluster_conf, $fw_conf) = @_;
1837
1838     my $srcdst;
1839     if ($dir eq 's') {
1840         $srcdst = "src";
1841     } elsif ($dir eq 'd') {
1842         $srcdst = "dst";
1843     } else {
1844         die "ipt_gen_src_or_dst_match: invalid direction $dir \n";
1845     }
1846
1847     my $match;
1848     if ($adr =~ m/^\+/) {
1849         if ($adr =~ m/^\+(${ipset_name_pattern})$/) {
1850             my $name = $1;
1851             my $ipset_chain;
1852             if ($fw_conf && $fw_conf->{ipset}->{$name}) {
1853                 $ipset_chain = compute_ipset_chain_name($fw_conf->{vmid}, $name, $ipversion);
1854             } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
1855                 $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
1856             } else {
1857                 die "no such ipset '$name'\n";
1858             }
1859             $match = "-m set --match-set ${ipset_chain} ${srcdst}";
1860         } else {
1861             die "invalid security group name '$adr'\n";
1862         }
1863     } elsif ($adr =~ m/^${ip_alias_pattern}$/){
1864         my $alias = lc($adr);
1865         my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1866         $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1867         die "no such alias '$adr'\n" if !$e;
1868         $match = "-${dir} $e->{cidr}";
1869     } elsif ($adr =~ m/\-/){
1870         $match = "-m iprange --${srcdst}-range $adr";
1871     } else {
1872         $match = "-${dir} $adr";
1873     }
1874
1875     return $match;
1876 }
1877
1878 # convert a %rule to an array of iptables commands
1879 sub ipt_rule_to_cmds {
1880     my ($rule, $chain, $ipversion, $cluster_conf, $fw_conf, $vmid) = @_;
1881
1882     die "ipt_rule_to_cmds unable to handle macro" if $rule->{macro}; #should not happen
1883
1884     my @match = ();
1885
1886     if (defined $rule->{match}) {
1887         push @match, $rule->{match};
1888     } else {
1889         push @match, "-i $rule->{iface_in}" if $rule->{iface_in};
1890         push @match, "-o $rule->{iface_out}" if $rule->{iface_out};
1891
1892         if ($rule->{source}) {
1893             push @match, ipt_gen_src_or_dst_match($rule->{source}, 's', $ipversion, $cluster_conf, $fw_conf);
1894         }
1895         if ($rule->{dest}) {
1896             push @match, ipt_gen_src_or_dst_match($rule->{dest}, 'd', $ipversion, $cluster_conf, $fw_conf);
1897         }
1898
1899         if (my $proto = $rule->{proto}) {
1900             push @match, "-p $proto";
1901
1902             my $multidport = defined($rule->{dport}) && parse_port_name_number_or_range($rule->{dport}, 1);
1903             my $multisport = defined($rule->{sport}) && parse_port_name_number_or_range($rule->{sport}, 0);
1904
1905             my $add_dport = sub {
1906                 return if !$rule->{dport};
1907
1908                 if ($proto eq 'icmp') {
1909                     # Note: we use dport to store --icmp-type
1910                     die "unknown icmp-type '$rule->{dport}'\n"
1911                         if $rule->{dport} !~ /^\d+$/ && !defined($icmp_type_names->{$rule->{dport}});
1912                     push @match, "-m icmp --icmp-type $rule->{dport}";
1913                 } elsif ($proto eq 'icmpv6') {
1914                     # Note: we use dport to store --icmpv6-type
1915                     die "unknown icmpv6-type '$rule->{dport}'\n"
1916                         if $rule->{dport} !~ /^\d+$/ && !defined($icmpv6_type_names->{$rule->{dport}});
1917                     push @match, "-m icmpv6 --icmpv6-type $rule->{dport}";
1918                 } elsif (!$PROTOCOLS_WITH_PORTS->{$proto}) {
1919                     die "protocol $proto does not have ports\n";
1920                 } elsif ($multidport) {
1921                     push @match, "--match multiport", "--dports $rule->{dport}";
1922                 } else {
1923                     push @match, "--dport $rule->{dport}";
1924                 }
1925             };
1926
1927             my $add_sport = sub {
1928                 return if !$rule->{sport};
1929
1930                 die "protocol $proto does not have ports\n"
1931                     if !$PROTOCOLS_WITH_PORTS->{$proto};
1932                 if ($multisport) {
1933                     push @match, "--match multiport", "--sports $rule->{sport}";
1934                 } else {
1935                     push @match, "--sport $rule->{sport}";
1936                 }
1937             };
1938
1939             # order matters - single port before multiport!
1940             $add_dport->() if $multisport;
1941             $add_sport->();
1942             $add_dport->() if !$multisport;
1943         } elsif ($rule->{dport} || $rule->{sport}) {
1944             die "destination port '$rule->{dport}', but no protocol specified\n" if $rule->{dport};
1945             die "source port '$rule->{sport}', but no protocol specified\n" if $rule->{sport};
1946         }
1947
1948         push @match, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
1949     }
1950     my $matchstr = scalar(@match) ? join(' ', @match) : "";
1951
1952     my $targetstr;
1953     if (defined $rule->{target}) {
1954         $targetstr = $rule->{target};
1955     } else {
1956         my $action = (defined $rule->{action}) ? $rule->{action} : "";
1957         my $goto = 1 if $action eq 'PVEFW-SET-ACCEPT-MARK';
1958         $targetstr = ($goto) ? "-g $action" : "-j $action";
1959     }
1960
1961     my @iptcmds;
1962     if (defined $rule->{log} && $rule->{log}) {
1963         my $logaction = get_log_rule_base($chain, $vmid, $rule->{logmsg}, $rule->{log});
1964         push @iptcmds, "-A $chain $matchstr $logaction";
1965     }
1966     push @iptcmds, "-A $chain $matchstr $targetstr";
1967     return @iptcmds;
1968 }
1969
1970 sub ruleset_generate_rule {
1971     my ($ruleset, $chain, $ipversion, $rule, $cluster_conf, $fw_conf) = @_;
1972
1973     my $rules;
1974
1975     if ($rule->{macro}) {
1976         $rules = &$apply_macro($rule->{macro}, $rule, 0, $ipversion);
1977     } else {
1978         $rules = [ $rule ];
1979     }
1980
1981     # update all or nothing
1982     my @ipt_rule_cmds;
1983     foreach my $r (@$rules) {
1984         push @ipt_rule_cmds, ipt_rule_to_cmds($r, $chain, $ipversion, $cluster_conf, $fw_conf);
1985     }
1986     foreach my $c (@ipt_rule_cmds) {
1987         ruleset_add_ipt_cmd($ruleset, $chain, $c);
1988     }
1989 }
1990
1991 sub ruleset_create_chain {
1992     my ($ruleset, $chain) = @_;
1993
1994     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
1995     die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
1996
1997     die "chain '$chain' already exists\n" if $ruleset->{$chain};
1998
1999     $ruleset->{$chain} = [];
2000 }
2001
2002 sub ruleset_chain_exist {
2003     my ($ruleset, $chain) = @_;
2004
2005     return $ruleset->{$chain} ? 1 : undef;
2006 }
2007
2008 # add an iptables command (like generated by ipt_rule_to_cmds) to a chain
2009 sub ruleset_add_ipt_cmd {
2010    my ($ruleset, $chain, $iptcmd) = @_;
2011
2012    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2013
2014    push @{$ruleset->{$chain}}, $iptcmd;
2015 }
2016
2017 sub ruleset_addrule {
2018    my ($ruleset, $chain, $match, $action, $log, $logmsg, $vmid) = @_;
2019
2020    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2021
2022    if (defined($log) && $log) {
2023         my $logaction = get_log_rule_base($chain, $vmid, $logmsg, $log);
2024         push @{$ruleset->{$chain}}, "-A $chain $match $logaction";
2025    }
2026    push @{$ruleset->{$chain}}, "-A $chain $match $action";
2027 }
2028
2029 sub ruleset_insertrule {
2030    my ($ruleset, $chain, $match, $action, $log) = @_;
2031
2032    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2033
2034    unshift @{$ruleset->{$chain}}, "-A $chain $match $action";
2035 }
2036
2037 sub get_log_rule_base {
2038     my ($chain, $vmid, $msg, $loglevel) = @_;
2039
2040     $vmid = 0 if !defined($vmid);
2041     $msg = "" if !defined($msg);
2042
2043     # Note: we use special format for prefix to pass further
2044     # info to log daemon (VMID, LOGLEVEL and CHAIN)
2045
2046     return "-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
2047 }
2048
2049 sub ruleset_add_chain_policy {
2050     my ($ruleset, $chain, $ipversion, $vmid, $policy, $loglevel, $accept_action) = @_;
2051
2052     if ($policy eq 'ACCEPT') {
2053
2054         my $rule = { action => 'ACCEPT' };
2055         rule_substitude_action($rule, { ACCEPT =>  $accept_action});
2056         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule);
2057
2058     } elsif ($policy eq 'DROP') {
2059
2060         ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Drop");
2061
2062         ruleset_addrule($ruleset, $chain, "", "-j DROP", $loglevel, "policy $policy: ", $vmid);
2063     } elsif ($policy eq 'REJECT') {
2064         ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Reject");
2065
2066         ruleset_addrule($ruleset, $chain, "", "-g PVEFW-reject", $loglevel, "policy $policy:", $vmid);
2067     } else {
2068         # should not happen
2069         die "internal error: unknown policy '$policy'";
2070     }
2071 }
2072
2073 sub ruleset_chain_add_ndp {
2074     my ($ruleset, $chain, $ipversion, $options, $direction, $accept) = @_;
2075     return if $ipversion != 6 || (defined($options->{ndp}) && !$options->{ndp});
2076
2077     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-solicitation", $accept);
2078     if ($direction ne 'OUT' || $options->{radv}) {
2079         ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", $accept);
2080     }
2081     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-solicitation", $accept);
2082     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-advertisement", $accept);
2083 }
2084
2085 sub ruleset_chain_add_conn_filters {
2086     my ($ruleset, $chain, $accept) = @_;
2087
2088     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID", "-j DROP");
2089     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED", "-j $accept");
2090 }
2091
2092 sub ruleset_chain_add_input_filters {
2093     my ($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel) = @_;
2094
2095     if ($cluster_conf->{ipset}->{blacklist}){
2096         if (!ruleset_chain_exist($ruleset, "PVEFW-blacklist")) {
2097             ruleset_create_chain($ruleset, "PVEFW-blacklist");
2098             ruleset_addrule($ruleset, "PVEFW-blacklist", "", "-j DROP", $loglevel, "DROP: ");
2099         }
2100         my $ipset_chain = compute_ipset_chain_name(0, 'blacklist', $ipversion);
2101         ruleset_addrule($ruleset, $chain, "-m set --match-set ${ipset_chain} src", "-j PVEFW-blacklist");
2102     }
2103
2104     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
2105         if ($ipversion == 4) {
2106             ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW", "-j PVEFW-smurfs");
2107         }
2108     }
2109
2110     if ($options->{tcpflags}) {
2111         ruleset_addrule($ruleset, $chain, "-p tcp", "-j PVEFW-tcpflags");
2112     }
2113 }
2114
2115 sub ruleset_create_vm_chain {
2116     my ($ruleset, $chain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction) = @_;
2117
2118     ruleset_create_chain($ruleset, $chain);
2119     my $accept = generate_nfqueue($options);
2120
2121     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
2122         if ($ipversion == 4) {
2123             if ($direction eq 'OUT') {
2124                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2125                                       { action => 'PVEFW-SET-ACCEPT-MARK',
2126                                         proto => 'udp', sport => 68, dport => 67 });
2127             } else {
2128                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2129                                       { action => 'ACCEPT',
2130                                         proto => 'udp', sport => 67, dport => 68 });
2131             }
2132         } elsif ($ipversion == 6) {
2133             if ($direction eq 'OUT') {
2134                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2135                                       { action => 'PVEFW-SET-ACCEPT-MARK',
2136                                         proto => 'udp', sport => 546, dport => 547 });
2137             } else {
2138                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2139                                       { action => 'ACCEPT',
2140                                         proto => 'udp', sport => 547, dport => 546 });
2141             }
2142         }
2143
2144     }
2145
2146     if ($direction eq 'OUT') {
2147         if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
2148             ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr", "-j DROP");
2149         }
2150         if ($ipversion == 6 && !$options->{radv}) {
2151             ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", "-j DROP");
2152         }
2153         if ($ipfilter_ipset) {
2154             ruleset_addrule($ruleset, $chain, "-m set ! --match-set $ipfilter_ipset src", "-j DROP");
2155         }
2156         ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2157     }
2158
2159     my $accept_action = $direction eq 'OUT' ? '-g PVEFW-SET-ACCEPT-MARK' : "-j $accept";
2160     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, $direction, $accept_action);
2161 }
2162
2163 sub ruleset_add_group_rule {
2164     my ($ruleset, $cluster_conf, $chain, $rule, $direction, $action, $ipversion) = @_;
2165
2166     my $group = $rule->{action};
2167     my $group_chain = "GROUP-$group-$direction";
2168     if(!ruleset_chain_exist($ruleset, $group_chain)){
2169         generate_group_rules($ruleset, $cluster_conf, $group, $ipversion);
2170     }
2171
2172     if ($direction eq 'OUT' && $rule->{iface_out}) {
2173         ruleset_addrule($ruleset, $chain, "-o $rule->{iface_out}", "-j $group_chain");
2174     } elsif ($direction eq 'IN' && $rule->{iface_in}) {
2175         ruleset_addrule($ruleset, $chain, "-i $rule->{iface_in}", "-j $group_chain");
2176     } else {
2177         ruleset_addrule($ruleset, $chain, "", "-j $group_chain");
2178     }
2179
2180     ruleset_addrule($ruleset, $chain, "-m mark --mark $FWACCEPTMARK_ON", "-j $action");
2181 }
2182
2183 sub ruleset_generate_vm_rules {
2184     my ($ruleset, $rules, $cluster_conf, $vmfw_conf, $chain, $netid, $direction, $options, $ipversion) = @_;
2185
2186     my $lc_direction = lc($direction);
2187
2188     my $in_accept = generate_nfqueue($options);
2189
2190     foreach my $rule (@$rules) {
2191         next if $rule->{iface} && $rule->{iface} ne $netid;
2192         next if !$rule->{enable} || $rule->{errors};
2193         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2194
2195         if ($rule->{type} eq 'group') {
2196             ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, $direction,
2197                                    $direction eq 'OUT' ? 'RETURN' : $in_accept, $ipversion);
2198         } else {
2199             next if $rule->{type} ne $lc_direction;
2200             eval {
2201                 if ($direction eq 'OUT') {
2202                     rule_substitude_action($rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
2203                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $vmfw_conf);
2204                 } else {
2205                     rule_substitude_action($rule, { ACCEPT => $in_accept , REJECT => "PVEFW-reject" });
2206                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $vmfw_conf);
2207                 }
2208             };
2209             warn $@ if $@;
2210         }
2211     }
2212 }
2213
2214 sub generate_nfqueue {
2215     my ($options) = @_;
2216
2217     if ($options->{ips}) {
2218         my $action = "NFQUEUE";
2219         if ($options->{ips_queues} && $options->{ips_queues} =~ m/^(\d+)(:(\d+))?$/) {
2220             if (defined($3) && defined($1)) {
2221                 $action .= " --queue-balance $1:$3";
2222             } elsif (defined($1)) {
2223                 $action .= " --queue-num $1";
2224             }
2225         }
2226         $action .= " --queue-bypass" if $feature_ipset_nomatch; #need kernel 3.10
2227         return $action;
2228     } else {
2229         return "ACCEPT";
2230     }
2231 }
2232
2233 sub ruleset_generate_vm_ipsrules {
2234     my ($ruleset, $options, $direction, $iface) = @_;
2235
2236     if ($options->{ips} && $direction eq 'IN') {
2237         my $nfqueue = generate_nfqueue($options);
2238
2239         if (!ruleset_chain_exist($ruleset, "PVEFW-IPS")) {
2240             ruleset_create_chain($ruleset, "PVEFW-IPS");
2241         }
2242
2243         ruleset_addrule($ruleset, "PVEFW-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged", "-j $nfqueue");
2244     }
2245 }
2246
2247 sub generate_tap_rules_direction {
2248     my ($ruleset, $cluster_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $direction, $ipversion) = @_;
2249
2250     my $lc_direction = lc($direction);
2251
2252     my $rules = $vmfw_conf->{rules};
2253
2254     my $options = $vmfw_conf->{options};
2255     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
2256
2257     my $tapchain = "$iface-$direction";
2258
2259     my $ipfilter_name = compute_ipfilter_ipset_name($netid);
2260     my $ipfilter_ipset = compute_ipset_chain_name($vmid, $ipfilter_name, $ipversion)
2261         if $options->{ipfilter} || $vmfw_conf->{ipset}->{$ipfilter_name};
2262
2263     # create chain with mac and ip filter
2264     ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
2265
2266     if ($options->{enable}) {
2267         ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $tapchain, $netid, $direction, $options, $ipversion);
2268
2269         ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface);
2270
2271         # implement policy
2272         my $policy;
2273
2274         if ($direction eq 'OUT') {
2275             $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
2276         } else {
2277         $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
2278         }
2279
2280         my $accept = generate_nfqueue($options);
2281         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
2282         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, $policy, $loglevel, $accept_action);
2283     } else {
2284         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : 'ACCEPT';
2285         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, 'ACCEPT', $loglevel, $accept_action);
2286     }
2287
2288     # plug the tap chain to bridge chain
2289     if ($direction eq 'IN') {
2290         ruleset_addrule($ruleset, "PVEFW-FWBR-IN",
2291                         "-m physdev --physdev-is-bridged --physdev-out $iface", "-j $tapchain");
2292     } else {
2293         ruleset_addrule($ruleset, "PVEFW-FWBR-OUT",
2294                         "-m physdev --physdev-is-bridged --physdev-in $iface", "-j $tapchain");
2295     }
2296 }
2297
2298 sub enable_host_firewall {
2299     my ($ruleset, $hostfw_conf, $cluster_conf, $ipversion) = @_;
2300
2301     my $options = $hostfw_conf->{options};
2302     my $cluster_options = $cluster_conf->{options};
2303     my $rules = $hostfw_conf->{rules};
2304     my $cluster_rules = $cluster_conf->{rules};
2305
2306     # host inbound firewall
2307     my $chain = "PVEFW-HOST-IN";
2308     ruleset_create_chain($ruleset, $chain);
2309
2310     my $loglevel = get_option_log_level($options, "log_level_in");
2311
2312     ruleset_addrule($ruleset, $chain, "-i lo", "-j ACCEPT");
2313
2314     ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
2315     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'IN', '-j RETURN');
2316     ruleset_chain_add_input_filters($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel);
2317
2318     # we use RETURN because we need to check also tap rules
2319     my $accept_action = 'RETURN';
2320
2321     ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
2322
2323     # add host rules first, so that cluster wide rules can be overwritten
2324     foreach my $rule (@$rules, @$cluster_rules) {
2325         next if !$rule->{enable} || $rule->{errors};
2326         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2327
2328         $rule->{iface_in} = $rule->{iface} if $rule->{iface};
2329
2330         eval {
2331             if ($rule->{type} eq 'group') {
2332                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'IN', $accept_action, $ipversion);
2333             } elsif ($rule->{type} eq 'in') {
2334                 rule_substitude_action($rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
2335                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $hostfw_conf);
2336             }
2337         };
2338         warn $@ if $@;
2339         delete $rule->{iface_in};
2340     }
2341
2342     # allow standard traffic for management ipset (includes cluster network)
2343     my $mngmnt_ipset_chain = compute_ipset_chain_name(0, "management", $ipversion);
2344     my $mngmntsrc = "-m set --match-set ${mngmnt_ipset_chain} src";
2345     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 8006", "-j $accept_action");  # PVE API
2346     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
2347     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
2348     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 22", "-j $accept_action");  # SSH
2349
2350     my $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
2351     my $localnet_ver = $cluster_conf->{aliases}->{local_network}->{ipversion};
2352
2353     # corosync
2354     if ($localnet && ($ipversion == $localnet_ver)) {
2355         my $corosync_rule = "-p udp --dport 5404:5405";
2356         ruleset_addrule($ruleset, $chain, "-s $localnet -d $localnet $corosync_rule", "-j $accept_action");
2357         ruleset_addrule($ruleset, $chain, "-s $localnet -m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action");
2358     }
2359
2360     # implement input policy
2361     my $policy = $cluster_options->{policy_in} || 'DROP'; # allow nothing by default
2362     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2363
2364     # host outbound firewall
2365     $chain = "PVEFW-HOST-OUT";
2366     ruleset_create_chain($ruleset, $chain);
2367
2368     $loglevel = get_option_log_level($options, "log_level_out");
2369
2370     ruleset_addrule($ruleset, $chain, "-o lo", "-j ACCEPT");
2371
2372     ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
2373
2374     # we use RETURN because we may want to check other thigs later
2375     $accept_action = 'RETURN';
2376     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'OUT', "-j $accept_action");
2377
2378     ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
2379
2380     # add host rules first, so that cluster wide rules can be overwritten
2381     foreach my $rule (@$rules, @$cluster_rules) {
2382         next if !$rule->{enable} || $rule->{errors};
2383         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2384
2385         $rule->{iface_out} = $rule->{iface} if $rule->{iface};
2386         eval {
2387             if ($rule->{type} eq 'group') {
2388                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'OUT', $accept_action, $ipversion);
2389             } elsif ($rule->{type} eq 'out') {
2390                 rule_substitude_action($rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
2391                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $hostfw_conf);
2392             }
2393         };
2394         warn $@ if $@;
2395         delete $rule->{iface_out};
2396     }
2397
2398     # allow standard traffic on cluster network
2399     if ($localnet && ($ipversion == $localnet_ver)) {
2400         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 8006", "-j $accept_action");  # PVE API
2401         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 22", "-j $accept_action");  # SSH
2402         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
2403         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
2404
2405         my $corosync_rule = "-p udp --dport 5404:5405";
2406         ruleset_addrule($ruleset, $chain, "-d $localnet $corosync_rule", "-j $accept_action");
2407         ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action");
2408     }
2409
2410     # implement output policy
2411     $policy = $cluster_options->{policy_out} || 'ACCEPT'; # allow everything by default
2412     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2413
2414     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "", "-j PVEFW-HOST-OUT");
2415     ruleset_addrule($ruleset, "PVEFW-INPUT", "", "-j PVEFW-HOST-IN");
2416 }
2417
2418 sub generate_group_rules {
2419     my ($ruleset, $cluster_conf, $group, $ipversion) = @_;
2420
2421     my $rules = $cluster_conf->{groups}->{$group};
2422
2423     if (!$rules) {
2424         warn "no such security group '$group'\n";
2425         $rules = []; # create empty chain
2426     }
2427
2428     my $chain = "GROUP-${group}-IN";
2429
2430     ruleset_create_chain($ruleset, $chain);
2431     ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2432
2433     foreach my $rule (@$rules) {
2434         next if $rule->{type} ne 'in';
2435         next if !$rule->{enable} || $rule->{errors};
2436         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2437         rule_substitude_action($rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
2438         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf);
2439     }
2440
2441     $chain = "GROUP-${group}-OUT";
2442
2443     ruleset_create_chain($ruleset, $chain);
2444     ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2445
2446     foreach my $rule (@$rules) {
2447         next if $rule->{type} ne 'out';
2448         next if !$rule->{enable} || $rule->{errors};
2449         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2450         # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
2451         # check also other tap rules later
2452         rule_substitude_action($rule, { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" });
2453         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf);
2454     }
2455 }
2456
2457 my $MAX_NETS = 32;
2458 my $valid_netdev_names = {};
2459 for (my $i = 0; $i < $MAX_NETS; $i++)  {
2460     $valid_netdev_names->{"net$i"} = 1;
2461 }
2462
2463 sub get_mark_values {
2464     my ($value, $mask) = @_;
2465     $value = hex($value) if $value =~ /^0x/;
2466     $mask = hex($mask) if defined($mask) && $mask =~ /^0x/;
2467     $mask = 0xffffffff if !defined($mask);
2468     return ($value, $mask);
2469 }
2470
2471 sub parse_fw_rule {
2472     my ($prefix, $line, $cluster_conf, $fw_conf, $rule_env, $verbose) = @_;
2473
2474     my $orig_line = $line;
2475
2476     my $rule = {};
2477
2478     # we can add single line comments to the end of the rule
2479     if ($line =~ s/#\s*(.*?)\s*$//) {
2480         $rule->{comment} = decode('utf8', $1);
2481     }
2482
2483     # we can disable a rule when prefixed with '|'
2484
2485     $rule->{enable} = $line =~ s/^\|// ? 0 : 1;
2486
2487     $line =~ s/^(\S+)\s+(\S+)\s*// ||
2488         die "unable to parse rule: $line\n";
2489
2490     $rule->{type} = lc($1);
2491     $rule->{action} = $2;
2492
2493     if ($rule->{type} eq  'in' || $rule->{type} eq 'out') {
2494         if ($rule->{action} =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
2495             $rule->{macro} = $1;
2496             $rule->{action} = $2;
2497         }
2498     }
2499
2500     while (length($line)) {
2501         if ($line =~ s/^-i (\S+)\s*//) {
2502             $rule->{iface} = $1;
2503             next;
2504         }
2505
2506         last if $rule->{type} eq 'group';
2507
2508         if ($line =~ s/^-p (\S+)\s*//) {
2509             $rule->{proto} = $1;
2510             next;
2511         }
2512
2513         if ($line =~ s/^-dport (\S+)\s*//) {
2514             $rule->{dport} = $1;
2515             next;
2516         }
2517
2518         if ($line =~ s/^-sport (\S+)\s*//) {
2519             $rule->{sport} = $1;
2520             next;
2521         }
2522         if ($line =~ s/^-source (\S+)\s*//) {
2523             $rule->{source} = $1;
2524             next;
2525         }
2526         if ($line =~ s/^-dest (\S+)\s*//) {
2527             $rule->{dest} = $1;
2528             next;
2529         }
2530
2531         last;
2532     }
2533
2534     die "unable to parse rule parameters: $line\n" if length($line);
2535
2536     $rule = verify_rule($rule, $cluster_conf, $fw_conf, $rule_env, 1);
2537     if ($rule->{errors}) {
2538         # The verbose flag really means we're running from the CLI and want
2539         # output on the console - in the other case we really want such errors
2540         # to go into the syslog instead.
2541         my $log = $verbose ? sub { warn @_ } : sub { syslog(err => @_) };
2542         $log->("$prefix - errors in rule parameters: $orig_line\n");
2543         foreach my $p (keys %{$rule->{errors}}) {
2544             $log->("  $p: $rule->{errors}->{$p}\n");
2545         }
2546     }
2547
2548     return $rule;
2549 }
2550
2551 sub verify_ethertype {
2552     my ($value) = @_;
2553     my $types = get_etc_ethertypes();
2554     die "unknown ethernet protocol type: $value\n"
2555         if !defined($types->{byname}->{$value}) &&
2556            !defined($types->{byid}->{$value});
2557 }
2558
2559 sub parse_vmfw_option {
2560     my ($line) = @_;
2561
2562     my ($opt, $value);
2563
2564     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2565
2566     if ($line =~ m/^(enable|dhcp|ndp|radv|macfilter|ipfilter|ips):\s*(0|1)\s*$/i) {
2567         $opt = lc($1);
2568         $value = int($2);
2569     } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
2570         $opt = lc($1);
2571         $value = $2 ? lc($3) : '';
2572     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2573         $opt = lc($1);
2574         $value = uc($3);
2575     } elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
2576         $opt = lc($1);
2577         $value = $2;
2578     } elsif ($line =~ m/^(layer2_protocols):\s*(((\S+)[,]?)+)\s*$/i) {
2579         $opt = lc($1);
2580         $value = $2;
2581         verify_ethertype($_) foreach split(/\s*,\s*/, $value);
2582     } else {
2583         die "can't parse option '$line'\n"
2584     }
2585
2586     return ($opt, $value);
2587 }
2588
2589 sub parse_hostfw_option {
2590     my ($line) = @_;
2591
2592     my ($opt, $value);
2593
2594     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2595
2596     if ($line =~ m/^(enable|nosmurfs|tcpflags|ndp):\s*(0|1)\s*$/i) {
2597         $opt = lc($1);
2598         $value = int($2);
2599     } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
2600         $opt = lc($1);
2601         $value = $2 ? lc($3) : '';
2602     } elsif ($line =~ m/^(nf_conntrack_max|nf_conntrack_tcp_timeout_established):\s*(\d+)\s*$/i) {
2603         $opt = lc($1);
2604         $value = int($2);
2605     } else {
2606         die "can't parse option '$line'\n"
2607     }
2608
2609     return ($opt, $value);
2610 }
2611
2612 sub parse_clusterfw_option {
2613     my ($line) = @_;
2614
2615     my ($opt, $value);
2616
2617     if ($line =~ m/^(enable):\s*(\d+)\s*$/i) {
2618         $opt = lc($1);
2619         $value = int($2);
2620         if (($value > 1) && ((time() - $value) > 60)) {
2621             $value = 0
2622         }
2623     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2624         $opt = lc($1);
2625         $value = uc($3);
2626     } else {
2627         die "can't parse option '$line'\n"
2628     }
2629
2630     return ($opt, $value);
2631 }
2632
2633 sub resolve_alias {
2634     my ($clusterfw_conf, $fw_conf, $cidr) = @_;
2635
2636     my $alias = lc($cidr);
2637     my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2638     $e = $clusterfw_conf->{aliases}->{$alias} if !$e && $clusterfw_conf;
2639
2640     die "no such alias '$cidr'\n" if !$e;;
2641
2642     return wantarray ? ($e->{cidr}, $e->{ipversion}) : $e->{cidr};
2643 }
2644
2645 sub parse_ip_or_cidr {
2646     my ($cidr) = @_;
2647
2648     my $ipversion;
2649
2650     if ($cidr =~ m!^(?:$IPV6RE)(/(\d+))?$!) {
2651         $cidr =~ s|/128$||;
2652         $ipversion = 6;
2653     } elsif ($cidr =~ m!^(?:$IPV4RE)(/(\d+))?$!) {
2654         $cidr =~ s|/32$||;
2655         $ipversion = 4;
2656     } else {
2657         die "value does not look like a valid IP address or CIDR network\n";
2658     }
2659
2660     return wantarray ? ($cidr, $ipversion) : $cidr;
2661 }
2662
2663 sub parse_alias {
2664     my ($line) = @_;
2665
2666     # we can add single line comments to the end of the line
2667     my $comment = decode('utf8', $1) if $line =~ s/\s*#\s*(.*?)\s*$//;
2668
2669     if ($line =~ m/^(\S+)\s(\S+)$/) {
2670         my ($name, $cidr) = ($1, $2);
2671         my $ipversion;
2672
2673         ($cidr, $ipversion) = parse_ip_or_cidr($cidr);
2674
2675         my $data = {
2676             name => $name,
2677             cidr => $cidr,
2678             ipversion => $ipversion,
2679         };
2680         $data->{comment} = $comment  if $comment;
2681         return $data;
2682     }
2683
2684     return undef;
2685 }
2686
2687 sub generic_fw_config_parser {
2688     my ($filename, $fh, $verbose, $cluster_conf, $empty_conf, $rule_env) = @_;
2689
2690     my $section;
2691     my $group;
2692
2693     my $res = $empty_conf;
2694
2695     while (defined(my $line = <$fh>)) {
2696         next if $line =~ m/^#/;
2697         next if $line =~ m/^\s*$/;
2698
2699         chomp $line;
2700
2701         my $linenr = $fh->input_line_number();
2702         my $prefix = "$filename (line $linenr)";
2703
2704         if ($empty_conf->{options} && ($line =~ m/^\[options\]$/i)) {
2705             $section = 'options';
2706             next;
2707         }
2708
2709         if ($empty_conf->{aliases} && ($line =~ m/^\[aliases\]$/i)) {
2710             $section = 'aliases';
2711             next;
2712         }
2713
2714         if ($empty_conf->{groups} && ($line =~ m/^\[group\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2715             $section = 'groups';
2716             $group = lc($1);
2717             my $comment = $2;
2718             eval {
2719                 die "security group name too long\n" if length($group) > $max_group_name_length;
2720                 die "invalid security group name '$group'\n" if $group !~ m/^${security_group_name_pattern}$/;
2721             };
2722             if (my $err = $@) {
2723                 ($section, $group, $comment) = undef;
2724                 warn "$prefix: $err";
2725                 next;
2726             }
2727
2728             $res->{$section}->{$group} = [];
2729             $res->{group_comments}->{$group} =  decode('utf8', $comment)
2730                 if $comment;
2731             next;
2732         }
2733
2734         if ($empty_conf->{rules} && ($line =~ m/^\[rules\]$/i)) {
2735             $section = 'rules';
2736             next;
2737         }
2738
2739         if ($empty_conf->{ipset} && ($line =~ m/^\[ipset\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2740             $section = 'ipset';
2741             $group = lc($1);
2742             my $comment = $2;
2743             eval {
2744                 die "ipset name too long\n" if length($group) > $max_ipset_name_length;
2745                 die "invalid ipset name '$group'\n" if $group !~ m/^${ipset_name_pattern}$/;
2746             };
2747             if (my $err = $@) {
2748                 ($section, $group, $comment) = undef;
2749                 warn "$prefix: $err";
2750                 next;
2751             }
2752
2753             $res->{$section}->{$group} = [];
2754             $res->{ipset_comments}->{$group} = decode('utf8', $comment)
2755                 if $comment;
2756             next;
2757         }
2758
2759         if (!$section) {
2760             warn "$prefix: skip line - no section\n";
2761             next;
2762         }
2763
2764         if ($section eq 'options') {
2765             eval {
2766                 my ($opt, $value);
2767                 if ($rule_env eq 'cluster') {
2768                     ($opt, $value) = parse_clusterfw_option($line);
2769                 } elsif ($rule_env eq 'host') {
2770                     ($opt, $value) = parse_hostfw_option($line);
2771                 } else {
2772                     ($opt, $value) = parse_vmfw_option($line);
2773                 }
2774                 $res->{options}->{$opt} = $value;
2775             };
2776             warn "$prefix: $@" if $@;
2777         } elsif ($section eq 'aliases') {
2778             eval {
2779                 my $data = parse_alias($line);
2780                 $res->{aliases}->{lc($data->{name})} = $data;
2781             };
2782             warn "$prefix: $@" if $@;
2783         } elsif ($section eq 'rules') {
2784             my $rule;
2785             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, $res, $rule_env, $verbose); };
2786             if (my $err = $@) {
2787                 warn "$prefix: $err";
2788                 next;
2789             }
2790             push @{$res->{$section}}, $rule;
2791         } elsif ($section eq 'groups') {
2792             my $rule;
2793             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, undef, 'group', $verbose); };
2794             if (my $err = $@) {
2795                 warn "$prefix: $err";
2796                 next;
2797             }
2798             push @{$res->{$section}->{$group}}, $rule;
2799         } elsif ($section eq 'ipset') {
2800             # we can add single line comments to the end of the rule
2801             my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
2802
2803             $line =~ m/^(\!)?\s*(\S+)\s*$/;
2804             my $nomatch = $1;
2805             my $cidr = $2;
2806             my $errors;
2807
2808             if ($nomatch && !$feature_ipset_nomatch) {
2809                 $errors->{nomatch} = "nomatch not supported by kernel";
2810             }
2811
2812             eval {
2813                 if ($cidr =~ m/^${ip_alias_pattern}$/) {
2814                     resolve_alias($cluster_conf, $res, $cidr); # make sure alias exists
2815                 } else {
2816                     $cidr = parse_ip_or_cidr($cidr);
2817                 }
2818             };
2819             if (my $err = $@) {
2820                 chomp $err;
2821                 $errors->{cidr} = $err;
2822             }
2823
2824             if ($cidr =~ m!/0+$!) {
2825                 $errors->{cidr} = "a zero prefix is not allowed in ipset entries\n";
2826             }
2827
2828             my $entry = { cidr => $cidr };
2829             $entry->{nomatch} = 1 if $nomatch;
2830             $entry->{comment} = $comment if $comment;
2831             $entry->{errors} =  $errors if $errors;
2832
2833             if ($verbose && $errors) {
2834                 warn "$prefix - errors in ipset '$group': $line\n";
2835                 foreach my $p (keys %{$errors}) {
2836                     warn "  $p: $errors->{$p}\n";
2837                 }
2838             }
2839
2840             push @{$res->{$section}->{$group}}, $entry;
2841         } else {
2842             warn "$prefix: skip line - unknown section\n";
2843             next;
2844         }
2845     }
2846
2847     return $res;
2848 }
2849
2850 sub parse_hostfw_config {
2851     my ($filename, $fh, $cluster_conf, $verbose) = @_;
2852
2853     my $empty_conf = { rules => [], options => {}};
2854
2855     return generic_fw_config_parser($filename, $fh, $verbose, $cluster_conf, $empty_conf, 'host');
2856 }
2857
2858 sub parse_vmfw_config {
2859     my ($filename, $fh, $cluster_conf, $rule_env, $verbose) = @_;
2860
2861     my $empty_conf = {
2862         rules => [],
2863         options => {},
2864         aliases => {},
2865         ipset => {} ,
2866         ipset_comments => {},
2867     };
2868
2869     return generic_fw_config_parser($filename, $fh, $verbose, $cluster_conf, $empty_conf, $rule_env);
2870 }
2871
2872 sub parse_clusterfw_config {
2873     my ($filename, $fh, $verbose) = @_;
2874
2875     my $section;
2876     my $group;
2877
2878     my $empty_conf = {
2879         rules => [],
2880         options => {},
2881         aliases => {},
2882         groups => {},
2883         group_comments => {},
2884         ipset => {} ,
2885         ipset_comments => {},
2886     };
2887
2888     return generic_fw_config_parser($filename, $fh, $verbose, $empty_conf, $empty_conf, 'cluster');
2889 }
2890
2891 sub run_locked {
2892     my ($code, @param) = @_;
2893
2894     my $timeout = 10;
2895
2896     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
2897
2898     die $@ if $@;
2899
2900     return $res;
2901 }
2902
2903 sub read_local_vm_config {
2904
2905     my $qemu = {};
2906     my $lxc = {};
2907
2908     my $vmdata = { qemu => $qemu, lxc => $lxc };
2909
2910     my $vmlist = PVE::Cluster::get_vmlist();
2911     return $vmdata if !$vmlist || !$vmlist->{ids};
2912     my $ids = $vmlist->{ids};
2913
2914     foreach my $vmid (keys %$ids) {
2915         next if !$vmid; # skip VE0
2916         my $d = $ids->{$vmid};
2917         next if !$d->{node} || $d->{node} ne $nodename;
2918         next if !$d->{type};
2919         if ($d->{type} eq 'qemu') {
2920             if ($have_qemu_server) {
2921                 my $cfspath = PVE::QemuConfig->cfs_config_path($vmid);
2922                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2923                     $qemu->{$vmid} = $conf;
2924                 }
2925             }
2926         } elsif ($d->{type} eq 'lxc') {
2927             if ($have_lxc) {
2928                 my $cfspath = PVE::LXC::Config->cfs_config_path($vmid);
2929                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2930                     $lxc->{$vmid} = $conf;
2931                 }
2932             }
2933         }
2934     }
2935
2936     return $vmdata;
2937 };
2938
2939 sub load_vmfw_conf {
2940     my ($cluster_conf, $rule_env, $vmid, $dir, $verbose) = @_;
2941
2942     my $vmfw_conf = {};
2943
2944     $dir = $pvefw_conf_dir if !defined($dir);
2945
2946     my $filename = "$dir/$vmid.fw";
2947     if (my $fh = IO::File->new($filename, O_RDONLY)) {
2948         $vmfw_conf = parse_vmfw_config($filename, $fh, $cluster_conf, $rule_env, $verbose);
2949         $vmfw_conf->{vmid} = $vmid;
2950     }
2951
2952     return $vmfw_conf;
2953 }
2954
2955 my $format_rules = sub {
2956     my ($rules, $allow_iface) = @_;
2957
2958     my $raw = '';
2959
2960     foreach my $rule (@$rules) {
2961         if ($rule->{type} eq  'in' || $rule->{type} eq 'out' || $rule->{type} eq 'group') {
2962             $raw .= '|' if defined($rule->{enable}) && !$rule->{enable};
2963             $raw .= uc($rule->{type});
2964             if ($rule->{macro}) {
2965                 $raw .= " $rule->{macro}($rule->{action})";
2966             } else {
2967                 $raw .= " " . $rule->{action};
2968             }
2969             if ($allow_iface && $rule->{iface}) {
2970                 $raw .= " -i $rule->{iface}";
2971             }
2972
2973             if ($rule->{type} ne  'group')  {
2974                 $raw .= " -source $rule->{source}" if $rule->{source};
2975                 $raw .= " -dest $rule->{dest}" if $rule->{dest};
2976                 $raw .= " -p $rule->{proto}" if $rule->{proto};
2977                 $raw .= " -dport $rule->{dport}" if $rule->{dport};
2978                 $raw .= " -sport $rule->{sport}" if $rule->{sport};
2979             }
2980
2981             $raw .= " # " . encode('utf8', $rule->{comment})
2982                 if $rule->{comment} && $rule->{comment} !~ m/^\s*$/;
2983             $raw .= "\n";
2984         } else {
2985             die "unknown rule type '$rule->{type}'";
2986         }
2987     }
2988
2989     return $raw;
2990 };
2991
2992 my $format_options = sub {
2993     my ($options) = @_;
2994
2995     my $raw = '';
2996
2997     $raw .= "[OPTIONS]\n\n";
2998     foreach my $opt (keys %$options) {
2999         $raw .= "$opt: $options->{$opt}\n";
3000     }
3001     $raw .= "\n";
3002
3003     return $raw;
3004 };
3005
3006 my $format_aliases = sub {
3007     my ($aliases) = @_;
3008
3009     my $raw = '';
3010
3011     $raw .= "[ALIASES]\n\n";
3012     foreach my $k (keys %$aliases) {
3013         my $e = $aliases->{$k};
3014         $raw .= "$e->{name} $e->{cidr}";
3015         $raw .= " # " . encode('utf8', $e->{comment})
3016             if $e->{comment} && $e->{comment} !~ m/^\s*$/;
3017         $raw .= "\n";
3018     }
3019     $raw .= "\n";
3020
3021     return $raw;
3022 };
3023
3024 my $format_ipsets = sub {
3025     my ($fw_conf) = @_;
3026
3027     my $raw = '';
3028
3029     foreach my $ipset (sort keys %{$fw_conf->{ipset}}) {
3030         if (my $comment = $fw_conf->{ipset_comments}->{$ipset}) {
3031             my $utf8comment = encode('utf8', $comment);
3032             $raw .= "[IPSET $ipset] # $utf8comment\n\n";
3033         } else {
3034             $raw .= "[IPSET $ipset]\n\n";
3035         }
3036         my $options = $fw_conf->{ipset}->{$ipset};
3037
3038         my $nethash = {};
3039         foreach my $entry (@$options) {
3040             $nethash->{$entry->{cidr}} = $entry;
3041         }
3042
3043         foreach my $cidr (sort keys %$nethash) {
3044             my $entry = $nethash->{$cidr};
3045             my $line = $entry->{nomatch} ? '!' : '';
3046             $line .= $entry->{cidr};
3047             $line .= " # " . encode('utf8', $entry->{comment})
3048                 if $entry->{comment} && $entry->{comment} !~ m/^\s*$/;
3049             $raw .= "$line\n";
3050         }
3051
3052         $raw .= "\n";
3053     }
3054
3055     return $raw;
3056 };
3057
3058 sub save_vmfw_conf {
3059     my ($vmid, $vmfw_conf) = @_;
3060
3061     my $raw = '';
3062
3063     my $options = $vmfw_conf->{options};
3064     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3065
3066     my $aliases = $vmfw_conf->{aliases};
3067     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3068
3069     $raw .= &$format_ipsets($vmfw_conf) if $vmfw_conf->{ipset};
3070
3071     my $rules = $vmfw_conf->{rules} || [];
3072     if ($rules && scalar(@$rules)) {
3073         $raw .= "[RULES]\n\n";
3074         $raw .= &$format_rules($rules, 1);
3075         $raw .= "\n";
3076     }
3077
3078     my $filename = "$pvefw_conf_dir/$vmid.fw";
3079     if ($raw) {
3080         mkdir $pvefw_conf_dir;
3081         PVE::Tools::file_set_contents($filename, $raw);
3082     } else {
3083         unlink $filename;
3084     }
3085 }
3086
3087 sub remove_vmfw_conf {
3088     my ($vmid) = @_;
3089
3090     my $vmfw_conffile = "$pvefw_conf_dir/$vmid.fw";
3091
3092     unlink $vmfw_conffile;
3093 }
3094
3095 sub clone_vmfw_conf {
3096     my ($vmid, $newid) = @_;
3097
3098     my $sourcevm_conffile = "$pvefw_conf_dir/$vmid.fw";
3099     my $clonevm_conffile = "$pvefw_conf_dir/$newid.fw";
3100
3101     if (-f $clonevm_conffile) {
3102         unlink $clonevm_conffile;
3103     }
3104     if (-f $sourcevm_conffile) {
3105         my $data = PVE::Tools::file_get_contents($sourcevm_conffile);
3106         PVE::Tools::file_set_contents($clonevm_conffile, $data);
3107     }
3108 }
3109
3110 sub read_vm_firewall_configs {
3111     my ($cluster_conf, $vmdata, $dir, $verbose) = @_;
3112
3113     my $vmfw_configs = {};
3114
3115     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3116         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'vm', $vmid, $dir, $verbose);
3117         next if !$vmfw_conf->{options}; # skip if file does not exists
3118         $vmfw_configs->{$vmid} = $vmfw_conf;
3119     }
3120     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3121         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'ct', $vmid, $dir, $verbose);
3122         next if !$vmfw_conf->{options}; # skip if file does not exists
3123         $vmfw_configs->{$vmid} = $vmfw_conf;
3124     }
3125
3126     return $vmfw_configs;
3127 }
3128
3129 sub get_option_log_level {
3130     my ($options, $k) = @_;
3131
3132     my $v = $options->{$k};
3133     $v = $default_log_level if !defined($v);
3134
3135     return undef if $v eq '' || $v eq 'nolog';
3136
3137     $v = $log_level_hash->{$v} if defined($log_level_hash->{$v});
3138
3139     return $v if ($v >= 0) && ($v <= 7);
3140
3141     warn "unknown log level ($k = '$v')\n";
3142
3143     return undef;
3144 }
3145
3146 sub generate_std_chains {
3147     my ($ruleset, $options, $ipversion) = @_;
3148
3149     my $std_chains = $pve_std_chains->{$ipversion} || die "internal error";
3150
3151     my $loglevel = get_option_log_level($options, 'smurf_log_level');
3152     my $chain = 'PVEFW-smurflog';
3153     if ( $std_chains->{$chain} ) {
3154         foreach my $r (@{$std_chains->{$chain}}) {
3155           $r->{log} = $loglevel;
3156         }
3157     }
3158
3159     # same as shorewall logflags action.
3160     $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
3161     $chain = 'PVEFW-logflags';
3162     if ( $std_chains->{$chain} ) {
3163         foreach my $r (@{$std_chains->{$chain}}) {
3164           $r->{log} = $loglevel;
3165         }
3166     }
3167
3168     foreach my $chain (keys %$std_chains) {
3169         ruleset_create_chain($ruleset, $chain);
3170         foreach my $rule (@{$std_chains->{$chain}}) {
3171             if (ref($rule)) {
3172                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule);
3173             } else {
3174                 die "rule $rule as string - should not happen";
3175             }
3176         }
3177     }
3178 }
3179
3180 sub generate_ipset_chains {
3181     my ($ipset_ruleset, $clusterfw_conf, $fw_conf, $device_ips, $ipsets) = @_;
3182
3183     foreach my $ipset (keys %{$ipsets}) {
3184
3185         my $options = $ipsets->{$ipset};
3186
3187         if ($device_ips && $ipset =~ /^ipfilter-(net\d+)$/) {
3188             if (my $ips = $device_ips->{$1}) {
3189                 $options = [@$options, @$ips];
3190             }
3191         }
3192
3193         # remove duplicates
3194         my $nethash = {};
3195         foreach my $entry (@$options) {
3196             next if $entry->{errors}; # skip entries with errors
3197             eval {
3198                 my ($cidr, $ver);
3199                 if ($entry->{cidr} =~ m/^${ip_alias_pattern}$/) {
3200                     ($cidr, $ver) = resolve_alias($clusterfw_conf, $fw_conf, $entry->{cidr});
3201                 } else {
3202                     ($cidr, $ver) = parse_ip_or_cidr($entry->{cidr});
3203                 }
3204                 #http://backreference.org/2013/03/01/ipv6-address-normalization/
3205                 if ($ver == 6) {
3206                     # ip_compress_address takes an address only, no CIDR
3207                     my ($addr, $prefix_len) = ($cidr =~ m@^([^/]*)(/.*)?$@);
3208                     $cidr = lc(Net::IP::ip_compress_address($addr, 6));
3209                     $cidr .= $prefix_len if defined($prefix_len);
3210                     $cidr =~ s|/128$||;
3211                 } else {
3212                     $cidr =~ s|/32$||;
3213                 }
3214
3215                 $nethash->{$ver}->{$cidr} = { cidr => $cidr, nomatch => $entry->{nomatch} };
3216             };
3217             warn $@ if $@;
3218         }
3219
3220         foreach my $ipversion (4, 6) {
3221             my $data = $nethash->{$ipversion};
3222
3223             my $name = compute_ipset_chain_name($fw_conf->{vmid}, $ipset, $ipversion);
3224
3225             my $hashsize = scalar(@$options);
3226             if ($hashsize <= 64) {
3227                 $hashsize = 64;
3228             } else {
3229                 $hashsize = round_powerof2($hashsize);
3230             }
3231
3232             my $family = $ipversion == "6" ? "inet6" : "inet";
3233
3234             $ipset_ruleset->{$name} = ["create $name hash:net family $family hashsize $hashsize maxelem $hashsize"];
3235
3236             foreach my $cidr (sort keys %$data) {
3237                 my $entry = $data->{$cidr};
3238
3239                 my $cmd = "add $name $cidr";
3240                 if ($entry->{nomatch}) {
3241                     if ($feature_ipset_nomatch) {
3242                         push @{$ipset_ruleset->{$name}}, "$cmd nomatch";
3243                     } else {
3244                         warn "ignore !$cidr - nomatch not supported by kernel\n";
3245                     }
3246                 } else {
3247                     push @{$ipset_ruleset->{$name}}, $cmd;
3248                 }
3249             }
3250         }
3251     }
3252 }
3253
3254 sub round_powerof2 {
3255     my ($int) = @_;
3256
3257     $int--;
3258     $int |= $int >> $_ foreach (1,2,4,8,16);
3259     return ++$int;
3260 }
3261
3262 sub load_clusterfw_conf {
3263     my ($filename, $verbose) = @_;
3264
3265     $filename = $clusterfw_conf_filename if !defined($filename);
3266
3267     my $cluster_conf = {};
3268     if (my $fh = IO::File->new($filename, O_RDONLY)) {
3269         $cluster_conf = parse_clusterfw_config($filename, $fh, $verbose);
3270     }
3271
3272     return $cluster_conf;
3273 }
3274
3275 sub save_clusterfw_conf {
3276     my ($cluster_conf) = @_;
3277
3278     my $raw = '';
3279
3280     my $options = $cluster_conf->{options};
3281     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3282
3283     my $aliases = $cluster_conf->{aliases};
3284     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3285
3286     $raw .= &$format_ipsets($cluster_conf) if $cluster_conf->{ipset};
3287
3288     my $rules = $cluster_conf->{rules};
3289     if ($rules && scalar(@$rules)) {
3290         $raw .= "[RULES]\n\n";
3291         $raw .= &$format_rules($rules, 1);
3292         $raw .= "\n";
3293     }
3294
3295     if ($cluster_conf->{groups}) {
3296         foreach my $group (sort keys %{$cluster_conf->{groups}}) {
3297             my $rules = $cluster_conf->{groups}->{$group};
3298             if (my $comment = $cluster_conf->{group_comments}->{$group}) {
3299                 my $utf8comment = encode('utf8', $comment);
3300                 $raw .= "[group $group] # $utf8comment\n\n";
3301             } else {
3302                 $raw .= "[group $group]\n\n";
3303             }
3304
3305             $raw .= &$format_rules($rules, 0);
3306             $raw .= "\n";
3307         }
3308     }
3309
3310     if ($raw) {
3311         mkdir $pvefw_conf_dir;
3312         PVE::Tools::file_set_contents($clusterfw_conf_filename, $raw);
3313     } else {
3314         unlink $clusterfw_conf_filename;
3315     }
3316 }
3317
3318 sub load_hostfw_conf {
3319     my ($cluster_conf, $filename, $verbose) = @_;
3320
3321     $filename = $hostfw_conf_filename if !defined($filename);
3322
3323     my $hostfw_conf = {};
3324     if (my $fh = IO::File->new($filename, O_RDONLY)) {
3325         $hostfw_conf = parse_hostfw_config($filename, $fh, $cluster_conf, $verbose);
3326     }
3327     return $hostfw_conf;
3328 }
3329
3330 sub save_hostfw_conf {
3331     my ($hostfw_conf) = @_;
3332
3333     my $raw = '';
3334
3335     my $options = $hostfw_conf->{options};
3336     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3337
3338     my $rules = $hostfw_conf->{rules};
3339     if ($rules && scalar(@$rules)) {
3340         $raw .= "[RULES]\n\n";
3341         $raw .= &$format_rules($rules, 1);
3342         $raw .= "\n";
3343     }
3344
3345     if ($raw) {
3346         PVE::Tools::file_set_contents($hostfw_conf_filename, $raw);
3347     } else {
3348         unlink $hostfw_conf_filename;
3349     }
3350 }
3351
3352 sub compile {
3353     my ($cluster_conf, $hostfw_conf, $vmdata, $verbose) = @_;
3354
3355     my $vmfw_configs;
3356
3357     # fixme: once we read standard chains from config this needs to be put in test/standard cases below
3358     $pve_std_chains = dclone($pve_std_chains_conf);
3359
3360     if ($vmdata) { # test mode
3361         my $testdir = $vmdata->{testdir} || die "no test directory specified";
3362         my $filename = "$testdir/cluster.fw";
3363         $cluster_conf = load_clusterfw_conf($filename, $verbose);
3364
3365         $filename = "$testdir/host.fw";
3366         $hostfw_conf = load_hostfw_conf($cluster_conf, $filename, $verbose);
3367
3368         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, $testdir, $verbose);
3369     } else { # normal operation
3370         $cluster_conf = load_clusterfw_conf(undef, $verbose) if !$cluster_conf;
3371
3372         $hostfw_conf = load_hostfw_conf($cluster_conf, undef, $verbose) if !$hostfw_conf;
3373
3374         $vmdata = read_local_vm_config();
3375         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, undef, $verbose);
3376     }
3377
3378     return ({},{},{}) if !$cluster_conf->{options}->{enable};
3379
3380     my $localnet;
3381     if ($cluster_conf->{aliases}->{local_network}) {
3382         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3383     } else {
3384         my $localnet_ver;
3385         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3386
3387         $cluster_conf->{aliases}->{local_network} = {
3388             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3389     }
3390
3391     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3392
3393     my $ruleset = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 4, $verbose);
3394     my $rulesetv6 = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 6, $verbose);
3395     my $ebtables_ruleset = compile_ebtables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $verbose);
3396     my $ipset_ruleset = compile_ipsets($cluster_conf, $vmfw_configs, $vmdata);
3397
3398     return ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
3399 }
3400
3401 sub compile_iptables_filter {
3402     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $ipversion, $verbose) = @_;
3403
3404     my $ruleset = {};
3405
3406     ruleset_create_chain($ruleset, "PVEFW-INPUT");
3407     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
3408
3409     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3410
3411     my $hostfw_options = $hostfw_conf->{options} || {};
3412
3413     # fixme: what log level should we use here?
3414     my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
3415
3416     ruleset_chain_add_conn_filters($ruleset, "PVEFW-FORWARD", "ACCEPT");
3417
3418     ruleset_create_chain($ruleset, "PVEFW-FWBR-IN");
3419     ruleset_chain_add_input_filters($ruleset, "PVEFW-FWBR-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
3420
3421     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-in fwln+", "-j PVEFW-FWBR-IN");
3422
3423     ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3424     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-out fwln+", "-j PVEFW-FWBR-OUT");
3425
3426     generate_std_chains($ruleset, $hostfw_options, $ipversion);
3427
3428     my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
3429
3430     if ($hostfw_enable) {
3431         eval { enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf, $ipversion); };
3432         warn $@ if $@; # just to be sure - should not happen
3433     }
3434
3435     # generate firewall rules for QEMU VMs
3436     foreach my $vmid (sort keys %{$vmdata->{qemu}}) {
3437         eval {
3438             my $conf = $vmdata->{qemu}->{$vmid};
3439             my $vmfw_conf = $vmfw_configs->{$vmid};
3440             return if !$vmfw_conf;
3441
3442             foreach my $netid (sort keys %$conf) {
3443                 next if $netid !~ m/^net(\d+)$/;
3444                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3445                 next if !$net->{firewall};
3446                 my $iface = "tap${vmid}i$1";
3447
3448                 my $macaddr = $net->{macaddr};
3449                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3450                                              $vmfw_conf, $vmid, 'IN', $ipversion);
3451                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3452                                              $vmfw_conf, $vmid, 'OUT', $ipversion);
3453             }
3454         };
3455         warn $@ if $@; # just to be sure - should not happen
3456     }
3457
3458     # generate firewall rules for LXC containers
3459     foreach my $vmid (sort keys %{$vmdata->{lxc}}) {
3460         eval {
3461             my $conf = $vmdata->{lxc}->{$vmid};
3462             my $vmfw_conf = $vmfw_configs->{$vmid};
3463             return if !$vmfw_conf;
3464
3465             if ($vmfw_conf->{options}->{enable}) {
3466                 foreach my $netid (sort keys %$conf) {
3467                     next if $netid !~ m/^net(\d+)$/;
3468                     my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3469                     next if !$net->{firewall};
3470                     my $iface = "veth${vmid}i$1";
3471                     my $macaddr = $net->{hwaddr};
3472                     generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3473                                                  $vmfw_conf, $vmid, 'IN', $ipversion);
3474                     generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3475                                                  $vmfw_conf, $vmid, 'OUT', $ipversion);
3476                 }
3477             }
3478         };
3479         warn $@ if $@; # just to be sure - should not happen
3480     }
3481
3482     if(ruleset_chain_exist($ruleset, "PVEFW-IPS")){
3483         ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED", "-j PVEFW-IPS");
3484     }
3485
3486     return $ruleset;
3487 }
3488
3489 sub mac_to_linklocal {
3490     my ($macaddr) = @_;
3491     my @parts = split(/:/, $macaddr);
3492     # The standard link local address uses the fe80::/64 prefix with the
3493     # modified EUI-64 identifier derived from the MAC address by flipping the
3494     # universal/local bit and inserting FF:FE in the middle.
3495     # See RFC 4291.
3496     $parts[0] = sprintf("%02x", hex($parts[0]) ^ 0x02);
3497     my @meui64 = (@parts[0,1,2], 'ff', 'fe', @parts[3,4,5]);
3498     return "fe80::$parts[0]$parts[1]:$parts[2]FF:FE$parts[3]:$parts[4]$parts[5]";
3499 }
3500
3501 sub compile_ipsets {
3502     my ($cluster_conf, $vmfw_configs, $vmdata) = @_;
3503
3504     my $localnet;
3505     if ($cluster_conf->{aliases}->{local_network}) {
3506         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3507     } else {
3508         my $localnet_ver;
3509         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3510
3511         $cluster_conf->{aliases}->{local_network} = {
3512             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3513     }
3514
3515     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3516
3517
3518     my $ipset_ruleset = {};
3519
3520     # generate ipsets for QEMU VMs
3521     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3522         eval {
3523             my $conf = $vmdata->{qemu}->{$vmid};
3524             my $vmfw_conf = $vmfw_configs->{$vmid};
3525             return if !$vmfw_conf;
3526
3527             # When the 'ipfilter' option is enabled every device for which there
3528             # is no 'ipfilter-netX' ipset defiend gets an implicit empty default
3529             # ipset.
3530             # The reason is that ipfilter ipsets are always filled with standard
3531             # IPv6 link-local filters.
3532             my $ipsets = $vmfw_conf->{ipset};
3533             my $implicit_sets = {};
3534
3535             my $device_ips = {};
3536             foreach my $netid (keys %$conf) {
3537                 next if $netid !~ m/^net(\d+)$/;
3538                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3539                 next if !$net->{firewall};
3540
3541                 if ($vmfw_conf->{options}->{ipfilter} && !$ipsets->{"ipfilter-$netid"}) {
3542                     $implicit_sets->{"ipfilter-$netid"} = [];
3543                 }
3544
3545                 my $macaddr = $net->{macaddr};
3546                 my $linklocal = mac_to_linklocal($macaddr);
3547                 $device_ips->{$netid} = [
3548                     { cidr => $linklocal },
3549                     { cidr => 'fe80::/10', nomatch => 1 }
3550                 ];
3551             }
3552
3553             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $ipsets);
3554             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $implicit_sets);
3555         };
3556         warn $@ if $@; # just to be sure - should not happen
3557     }
3558
3559     # generate firewall rules for LXC containers
3560     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3561         eval {
3562             my $conf = $vmdata->{lxc}->{$vmid};
3563             my $vmfw_conf = $vmfw_configs->{$vmid};
3564             return if !$vmfw_conf;
3565
3566             # When the 'ipfilter' option is enabled every device for which there
3567             # is no 'ipfilter-netX' ipset defiend gets an implicit empty default
3568             # ipset.
3569             # The reason is that ipfilter ipsets are always filled with standard
3570             # IPv6 link-local filters, as well as the IP addresses configured
3571             # for the container.
3572             my $ipsets = $vmfw_conf->{ipset};
3573             my $implicit_sets = {};
3574
3575             my $device_ips = {};
3576             foreach my $netid (keys %$conf) {
3577                 next if $netid !~ m/^net(\d+)$/;
3578                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3579                 next if !$net->{firewall};
3580
3581                 if ($vmfw_conf->{options}->{ipfilter} && !$ipsets->{"ipfilter-$netid"}) {
3582                     $implicit_sets->{"ipfilter-$netid"} = [];
3583                 }
3584
3585                 my $macaddr = $net->{hwaddr};
3586                 my $linklocal = mac_to_linklocal($macaddr);
3587                 my $set = $device_ips->{$netid} = [
3588                     { cidr => $linklocal },
3589                     { cidr => 'fe80::/10', nomatch => 1 }
3590                 ];
3591                 if (defined($net->{ip}) && $net->{ip} =~ m!^($IPV4RE)(?:/\d+)?$!) {
3592                     push @$set, { cidr => $1 };
3593                 }
3594                 if (defined($net->{ip6}) && $net->{ip6} =~ m!^($IPV6RE)(?:/\d+)?$!) {
3595                     push @$set, { cidr => $1 };
3596                 }
3597             }
3598
3599             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $ipsets);
3600             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $implicit_sets);
3601         };
3602         warn $@ if $@; # just to be sure - should not happen
3603     }
3604
3605     generate_ipset_chains($ipset_ruleset, undef, $cluster_conf, undef, $cluster_conf->{ipset});
3606
3607     return $ipset_ruleset;
3608 }
3609
3610 sub compile_ebtables_filter {
3611     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $verbose) = @_;
3612
3613     return ({}, {}) if !$cluster_conf->{options}->{enable};
3614
3615     my $ruleset = {};
3616
3617     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3618
3619
3620     ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3621     #for ipv4 and ipv6, check macaddress in iptables, so we use conntrack 'ESTABLISHED', to speedup rules
3622     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-p IPv4', '-j ACCEPT');
3623     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-p IPv6', '-j ACCEPT');
3624     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-o fwln+', '-j PVEFW-FWBR-OUT');
3625
3626     # generate firewall rules for QEMU VMs
3627     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3628         eval {
3629             my $conf = $vmdata->{qemu}->{$vmid};
3630             my $vmfw_conf = $vmfw_configs->{$vmid};
3631             return if !$vmfw_conf;
3632
3633             foreach my $netid (keys %$conf) {
3634                 next if $netid !~ m/^net(\d+)$/;
3635                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3636                 next if !$net->{firewall};
3637                 my $iface = "tap${vmid}i$1";
3638                 my $macaddr = $net->{macaddr};
3639
3640                 generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid);
3641
3642             }
3643         };
3644         warn $@ if $@; # just to be sure - should not happen
3645     }
3646
3647     # generate firewall rules for LXC containers
3648     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3649         eval {
3650             my $conf = $vmdata->{lxc}->{$vmid};
3651
3652             my $vmfw_conf = $vmfw_configs->{$vmid};
3653             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3654
3655             foreach my $netid (keys %$conf) {
3656                 next if $netid !~ m/^net(\d+)$/;
3657                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3658                 next if !$net->{firewall};
3659                 my $iface = "veth${vmid}i$1";
3660                 my $macaddr = $net->{hwaddr};
3661                 generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid);
3662             }
3663         };
3664         warn $@ if $@; # just to be sure - should not happen
3665     }
3666
3667     return $ruleset;
3668 }
3669
3670 sub generate_tap_layer2filter {
3671     my ($ruleset, $iface, $macaddr, $vmfw_conf, $vmid) = @_;
3672     my $options = $vmfw_conf->{options};
3673
3674     my $tapchain = $iface."-OUT";
3675
3676     # ebtables remove zeros from mac pairs
3677     $macaddr =~ s/0([0-9a-f])/$1/ig;
3678     $macaddr = lc($macaddr);
3679
3680     ruleset_create_chain($ruleset, $tapchain);
3681
3682     if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
3683             ruleset_addrule($ruleset, $tapchain, "-s ! $macaddr", '-j DROP');
3684     }
3685
3686     if (defined($options->{layer2_protocols})){
3687         foreach my $proto (split(/,/, $options->{layer2_protocols})) {
3688             ruleset_addrule($ruleset, $tapchain, "-p $proto", '-j ACCEPT');
3689         }
3690         ruleset_addrule($ruleset, $tapchain, '', "-j DROP");
3691     } else {
3692         ruleset_addrule($ruleset, $tapchain, '', '-j ACCEPT');
3693     }
3694
3695     ruleset_addrule($ruleset, 'PVEFW-FWBR-OUT', "-i $iface", "-j $tapchain");
3696 }
3697
3698 sub get_ruleset_status {
3699     my ($ruleset, $active_chains, $digest_fn, $verbose) = @_;
3700
3701     my $statushash = {};
3702
3703     foreach my $chain (sort keys %$ruleset) {
3704         my $sig = &$digest_fn($ruleset->{$chain});
3705
3706         $statushash->{$chain}->{sig} = $sig;
3707
3708         my $oldsig = $active_chains->{$chain};
3709         if (!defined($oldsig)) {
3710             $statushash->{$chain}->{action} = 'create';
3711         } else {
3712             if ($oldsig eq $sig) {
3713                 $statushash->{$chain}->{action} = 'exists';
3714             } else {
3715                 $statushash->{$chain}->{action} = 'update';
3716             }
3717         }
3718         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
3719         foreach my $cmd (@{$ruleset->{$chain}}) {
3720             print "\t$cmd\n" if $verbose;
3721         }
3722     }
3723
3724     foreach my $chain (sort keys %$active_chains) {
3725         if (!defined($ruleset->{$chain})) {
3726             my $sig = $active_chains->{$chain};
3727             $statushash->{$chain}->{action} = 'delete';
3728             $statushash->{$chain}->{sig} = $sig;
3729             print "delete $chain ($sig)\n" if $verbose;
3730         }
3731     }
3732
3733     return $statushash;
3734 }
3735
3736 sub print_sig_rule {
3737     my ($chain, $sig) = @_;
3738
3739     # We just use this to store a SHA1 checksum used to detect changes
3740     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
3741 }
3742
3743 sub get_ruleset_cmdlist {
3744     my ($ruleset, $verbose, $iptablescmd) = @_;
3745
3746     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
3747
3748     my ($active_chains, $hooks) = iptables_get_chains($iptablescmd);
3749     my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, $verbose);
3750
3751     # create missing chains first
3752     foreach my $chain (sort keys %$ruleset) {
3753         my $stat = $statushash->{$chain};
3754         die "internal error" if !$stat;
3755         next if $stat->{action} ne 'create';
3756
3757         $cmdlist .= ":$chain - [0:0]\n";
3758     }
3759
3760     foreach my $h (qw(INPUT OUTPUT FORWARD)) {
3761         my $chain = "PVEFW-$h";
3762         if ($ruleset->{$chain} && !$hooks->{$h}) {
3763             $cmdlist .= "-A $h -j $chain\n";
3764         }
3765     }
3766
3767     foreach my $chain (sort keys %$ruleset) {
3768         my $stat = $statushash->{$chain};
3769         die "internal error" if !$stat;
3770
3771         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
3772             $cmdlist .= "-F $chain\n";
3773             foreach my $cmd (@{$ruleset->{$chain}}) {
3774                 $cmdlist .= "$cmd\n";
3775             }
3776             $cmdlist .= print_sig_rule($chain, $stat->{sig});
3777         } elsif ($stat->{action} eq 'delete') {
3778             die "internal error"; # this should not happen
3779         } elsif ($stat->{action} eq 'exists') {
3780             # do nothing
3781         } else {
3782             die "internal error - unknown status '$stat->{action}'";
3783         }
3784     }
3785
3786     foreach my $chain (keys %$statushash) {
3787         next if $statushash->{$chain}->{action} ne 'delete';
3788         $cmdlist .= "-F $chain\n";
3789     }
3790     foreach my $chain (keys %$statushash) {
3791         next if $statushash->{$chain}->{action} ne 'delete';
3792         next if $chain eq 'PVEFW-INPUT';
3793         next if $chain eq 'PVEFW-OUTPUT';
3794         next if $chain eq 'PVEFW-FORWARD';
3795         $cmdlist .= "-X $chain\n";
3796     }
3797
3798     my $changes = $cmdlist ne "*filter\n" ? 1 : 0;
3799
3800     $cmdlist .= "COMMIT\n";
3801
3802     return wantarray ? ($cmdlist, $changes) : $cmdlist;
3803 }
3804
3805 sub get_ipset_cmdlist {
3806     my ($ruleset, $verbose) = @_;
3807
3808     my $cmdlist = "";
3809
3810     my $delete_cmdlist = "";
3811
3812     my $active_chains = ipset_get_chains();
3813     my $statushash = get_ruleset_status($ruleset, $active_chains, \&ipset_chain_digest, $verbose);
3814
3815     # remove stale _swap chains
3816     foreach my $chain (keys %$active_chains) {
3817         if ($chain =~ m/^PVEFW-\S+_swap$/) {
3818             $cmdlist .= "destroy $chain\n";
3819         }
3820     }
3821
3822     foreach my $chain (keys %$ruleset) {
3823         my $stat = $statushash->{$chain};
3824         die "internal error" if !$stat;
3825
3826         if ($stat->{action} eq 'create') {
3827             foreach my $cmd (@{$ruleset->{$chain}}) {
3828                 $cmdlist .= "$cmd\n";
3829             }
3830         }
3831     }
3832
3833     foreach my $chain (keys %$ruleset) {
3834         my $stat = $statushash->{$chain};
3835         die "internal error" if !$stat;
3836
3837         if ($stat->{action} eq 'update') {
3838             my $chain_swap = $chain."_swap";
3839
3840             foreach my $cmd (@{$ruleset->{$chain}}) {
3841                 $cmd =~ s/$chain/$chain_swap/;
3842                 $cmdlist .= "$cmd\n";
3843             }
3844             $cmdlist .= "swap $chain_swap $chain\n";
3845             $cmdlist .= "flush $chain_swap\n";
3846             $cmdlist .= "destroy $chain_swap\n";
3847         }
3848     }
3849
3850      # the remove unused chains
3851     foreach my $chain (keys %$statushash) {
3852         next if $statushash->{$chain}->{action} ne 'delete';
3853
3854         $delete_cmdlist .= "flush $chain\n";
3855         $delete_cmdlist .= "destroy $chain\n";
3856     }
3857
3858     my $changes = ($cmdlist || $delete_cmdlist) ? 1 : 0;
3859
3860     return ($cmdlist, $delete_cmdlist, $changes);
3861 }
3862
3863 sub apply_ruleset {
3864     my ($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $verbose) = @_;
3865
3866     enable_bridge_firewall();
3867
3868     my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
3869         get_ipset_cmdlist($ipset_ruleset, $verbose);
3870
3871     my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset, $verbose);
3872     my ($cmdlistv6, $changesv6) = get_ruleset_cmdlist($rulesetv6, $verbose, "ip6tables");
3873
3874     if ($verbose) {
3875         if ($ipset_changes) {
3876             print "ipset changes:\n";
3877             print $ipset_create_cmdlist if $ipset_create_cmdlist;
3878             print $ipset_delete_cmdlist if $ipset_delete_cmdlist;
3879         }
3880
3881         if ($changes) {
3882             print "iptables changes:\n";
3883             print $cmdlist;
3884         }
3885
3886         if ($changesv6) {
3887             print "ip6tables changes:\n";
3888             print $cmdlistv6;
3889         }
3890     }
3891
3892     my $tmpfile = "$pve_fw_status_dir/ipsetcmdlist1";
3893     PVE::Tools::file_set_contents($tmpfile, $ipset_create_cmdlist || '');
3894
3895     ipset_restore_cmdlist($ipset_create_cmdlist);
3896
3897     $tmpfile = "$pve_fw_status_dir/ip4cmdlist";
3898     PVE::Tools::file_set_contents($tmpfile, $cmdlist || '');
3899
3900     iptables_restore_cmdlist($cmdlist);
3901
3902     $tmpfile = "$pve_fw_status_dir/ip6cmdlist";
3903     PVE::Tools::file_set_contents($tmpfile, $cmdlistv6 || '');
3904
3905     ip6tables_restore_cmdlist($cmdlistv6);
3906
3907     $tmpfile = "$pve_fw_status_dir/ipsetcmdlist2";
3908     PVE::Tools::file_set_contents($tmpfile, $ipset_delete_cmdlist || '');
3909
3910     ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
3911
3912     # test: re-read status and check if everything is up to date
3913     my $active_chains = iptables_get_chains();
3914     my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, 0);
3915
3916     my $errors;
3917     foreach my $chain (sort keys %$ruleset) {
3918         my $stat = $statushash->{$chain};
3919         if ($stat->{action} ne 'exists') {
3920             warn "unable to update chain '$chain'\n";
3921             $errors = 1;
3922         }
3923     }
3924
3925     my $active_chainsv6 = iptables_get_chains("ip6tables");
3926     my $statushashv6 = get_ruleset_status($rulesetv6, $active_chainsv6, \&iptables_chain_digest, 0);
3927
3928     foreach my $chain (sort keys %$rulesetv6) {
3929         my $stat = $statushashv6->{$chain};
3930         if ($stat->{action} ne 'exists') {
3931             warn "unable to update chain '$chain'\n";
3932             $errors = 1;
3933         }
3934     }
3935
3936     die "unable to apply firewall changes\n" if $errors;
3937
3938     update_nf_conntrack_max($hostfw_conf);
3939
3940     update_nf_conntrack_tcp_timeout_established($hostfw_conf);
3941
3942 }
3943
3944 sub update_nf_conntrack_max {
3945     my ($hostfw_conf) = @_;
3946
3947     my $max = 65536; # reasonable default
3948
3949     my $options = $hostfw_conf->{options} || {};
3950
3951     if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
3952         $max = $options->{nf_conntrack_max};
3953         $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
3954     }
3955
3956     my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
3957     my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
3958
3959     my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
3960
3961     if ($current != $max) {
3962         my $hashsize = int($max/4);
3963         PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
3964         PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
3965     }
3966 }
3967
3968 sub update_nf_conntrack_tcp_timeout_established {
3969     my ($hostfw_conf) = @_;
3970
3971     my $options = $hostfw_conf->{options} || {};
3972
3973     my $value = defined($options->{nf_conntrack_tcp_timeout_established}) ? $options->{nf_conntrack_tcp_timeout_established} : 432000;
3974
3975     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established", $value);
3976 }
3977
3978 sub remove_pvefw_chains {
3979
3980     PVE::Firewall::remove_pvefw_chains_iptables("iptables");
3981     PVE::Firewall::remove_pvefw_chains_iptables("ip6tables");
3982     PVE::Firewall::remove_pvefw_chains_ipset();
3983
3984 }
3985
3986 sub remove_pvefw_chains_iptables {
3987     my ($iptablescmd) = @_;
3988
3989     my ($chash, $hooks) = iptables_get_chains($iptablescmd);
3990     my $cmdlist = "*filter\n";
3991
3992     foreach my $h (qw(INPUT OUTPUT FORWARD)) {
3993         if ($hooks->{$h}) {
3994             $cmdlist .= "-D $h -j PVEFW-$h\n";
3995         }
3996     }
3997
3998     foreach my $chain (keys %$chash) {
3999         $cmdlist .= "-F $chain\n";
4000     }
4001
4002     foreach my $chain (keys %$chash) {
4003         $cmdlist .= "-X $chain\n";
4004     }
4005     $cmdlist .= "COMMIT\n";
4006
4007     if($iptablescmd eq "ip6tables") {
4008         ip6tables_restore_cmdlist($cmdlist);
4009     } else {
4010         iptables_restore_cmdlist($cmdlist);
4011     }
4012 }
4013
4014 sub remove_pvefw_chains_ipset {
4015
4016     my $ipset_chains = ipset_get_chains();
4017
4018     my $cmdlist = "";
4019
4020     foreach my $chain (keys %$ipset_chains) {
4021         $cmdlist .= "flush $chain\n";
4022         $cmdlist .= "destroy $chain\n";
4023     }
4024
4025     ipset_restore_cmdlist($cmdlist) if $cmdlist;
4026 }
4027
4028 sub init {
4029     my $cluster_conf = load_clusterfw_conf();
4030     my $cluster_options = $cluster_conf->{options};
4031     my $enable = $cluster_options->{enable};
4032
4033     return if !$enable;
4034
4035     # load required modules here
4036 }
4037
4038 sub update {
4039     my $code = sub {
4040
4041         my $cluster_conf = load_clusterfw_conf();
4042         my $cluster_options = $cluster_conf->{options};
4043
4044         if (!$cluster_options->{enable}) {
4045             PVE::Firewall::remove_pvefw_chains();
4046             return;
4047         }
4048
4049         my $hostfw_conf = load_hostfw_conf($cluster_conf);
4050
4051         my ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset) = compile($cluster_conf, $hostfw_conf);
4052
4053         apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6);
4054     };
4055
4056     run_locked($code);
4057 }
4058
4059 1;