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).*$!) {
 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 my $etc_protocols;
 880
 881 sub get_etc_protocols {
 882     return $etc_protocols if $etc_protocols;
 883
 884     my $filename = "/etc/protocols";
 885
 886     my $fh = IO::File->new($filename, O_RDONLY);
 887     if (!$fh) {
 888         warn "unable to read '$filename' - $!\n";
 889         return {};
 890     }
 891
 892     my $protocols = {};
 893
 894     while (my $line = <$fh>) {
 895         chomp ($line);
 896         next if $line =~m/^#/;
 897         next if ($line =~m/^\s*$/);
 898
 899         if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
 900             $protocols->{byid}->{$2}->{name} = $1;
 901             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
 902         }
 903     }
 904
 905     close($fh);
 906
 907     # add special case for ICMP v6
 908     $protocols->{byid}->{icmpv6}->{name} = "icmpv6";
 909     $protocols->{byname}->{icmpv6} = $protocols->{byid}->{icmpv6};
 910
 911     $etc_protocols = $protocols;
 912
 913     return $etc_protocols;
 914 }
 915
 916 my $__local_network;
 917
 918 sub local_network {
 919     my ($new_value) = @_;
 920
 921     $__local_network = $new_value if defined($new_value);
 922
 923     return $__local_network if defined($__local_network);
 924
 925     eval {
 926         my $nodename = PVE::INotify::nodename();
 927
 928         my $ip = PVE::Cluster::remote_node_ip($nodename);
 929
 930         my $testip = Net::IP->new($ip);
 931
 932         my $isv6 = $testip->version == 6;
 933         my $routes = $isv6 ? PVE::ProcFSTools::read_proc_net_ipv6_route()
 934                            : PVE::ProcFSTools::read_proc_net_route();
 935         foreach my $entry (@$routes) {
 936             my $mask;
 937             if ($isv6) {
 938                 $mask = $entry->{prefix};
 939                 next if !$mask; # skip the default route...
 940             } else {
 941                 $mask = $PVE::Network::ipv4_mask_hash_localnet->{$entry->{mask}};
 942                 next if !defined($mask);
 943             }
 944             my $cidr = "$entry->{dest}/$mask";
 945             my $testnet = Net::IP->new($cidr);
 946             my $overlap = $testnet->overlaps($testip);
 947             if ($overlap == $Net::IP::IP_B_IN_A_OVERLAP ||
 948                 $overlap == $Net::IP::IP_IDENTICAL)
 949             {
 950                 $__local_network = $cidr;
 951                 return;
 952             }
 953         }
 954     };
 955     warn $@ if $@;
 956
 957     return $__local_network;
 958 }
 959
 960 # ipset names are limited to 31 characters,
 961 # and we use '-v4' or '-v6' to indicate IP versions,
 962 # and we use '_swap' suffix for atomic update,
 963 # for example PVEFW-${VMID}-${ipset_name}_swap
 964
 965 my $max_iptables_ipset_name_length = 31 - length("PVEFW-") - length("_swap");
 966
 967 sub compute_ipset_chain_name {
 968     my ($vmid, $ipset_name, $ipversion) = @_;
 969
 970     $vmid = 0 if !defined($vmid);
 971
 972     my $id = "$vmid-${ipset_name}-v$ipversion";
 973
 974     if (length($id) > $max_iptables_ipset_name_length) {
 975         $id = PVE::Tools::fnv31a_hex($id);
 976     }
 977
 978     return "PVEFW-$id";
 979 }
 980
 981 sub compute_ipfilter_ipset_name {
 982     my ($iface) = @_;
 983
 984     return "ipfilter-$iface";
 985 }
 986
 987 sub parse_address_list {
 988     my ($str) = @_;
 989
 990     if ($str =~ m/^(\+)(\S+)$/) { # ipset ref
 991         die "ipset name too long\n" if length($str) > ($max_ipset_name_length + 1);
 992         return;
 993     }
 994
 995     if ($str =~ m/^${ip_alias_pattern}$/) {
 996         die "alias name too long\n" if length($str) > $max_alias_name_length;
 997         return;
 998     }
 999
1000     my $count = 0;
1001     my $iprange = 0;
1002     my $ipversion;
1003
1004     my @elements = split(/,/, $str);
1005     die "extraneous commas in list\n" if $str ne join(',', @elements);
1006     foreach my $elem (@elements) {
1007         $count++;
1008         my $ip = Net::IP->new($elem);
1009         if (!$ip) {
1010             my $err = Net::IP::Error();
1011             die "invalid IP address: $err\n";
1012         }
1013         $iprange = 1 if $elem =~ m/-/;
1014
1015         my $new_ipversion = Net::IP::ip_is_ipv6($ip->ip()) ? 6 : 4;
1016
1017         die "detected mixed ipv4/ipv6 addresses in address list '$str'\n"
1018             if $ipversion && ($new_ipversion != $ipversion);
1019
1020         $ipversion = $new_ipversion;
1021     }
1022
1023     die "you can't use a range in a list\n" if $iprange && $count > 1;
1024
1025     return $ipversion;
1026 }
1027
1028 sub parse_port_name_number_or_range {
1029     my ($str, $dport) = @_;
1030
1031     my $services = PVE::Firewall::get_etc_services();
1032     my $count = 0;
1033     my $icmp_port = 0;
1034
1035     my @elements = split(/,/, $str);
1036     die "extraneous commas in list\n" if $str ne join(',', @elements);
1037     foreach my $item (@elements) {
1038         if ($item =~ m/^(\d+):(\d+)$/) {
1039             $count += 2;
1040             my ($port1, $port2) = ($1, $2);
1041             die "invalid port '$port1'\n" if $port1 > 65535;
1042             die "invalid port '$port2'\n" if $port2 > 65535;
1043         } elsif ($item =~ m/^(\d+)$/) {
1044             $count += 1;
1045             my $port = $1;
1046             die "invalid port '$port'\n" if $port > 65535;
1047         } else {
1048             if ($dport && $icmp_type_names->{$item}) {
1049                 $icmp_port = 1;
1050             } elsif ($dport && $icmpv6_type_names->{$item}) {
1051                 $icmp_port = 1;
1052             } else {
1053                 die "invalid port '$item'\n" if !$services->{byname}->{$item};
1054             }
1055         }
1056     }
1057
1058     die "ICPM ports not allowed in port range\n" if $icmp_port && $count > 0;
1059
1060     # I really don't like to use the word number here, but it's the only thing
1061     # that makes sense in a literal way. The range 1:100 counts as 2, not as
1062     # one and not as 100...
1063     die "too many entries in port list (> 15 numbers)\n"
1064         if $count > 15;
1065
1066     return $count;
1067 }
1068
1069 PVE::JSONSchema::register_format('pve-fw-sport-spec', \&pve_fw_verify_sport_spec);
1070 sub pve_fw_verify_sport_spec {
1071    my ($portstr) = @_;
1072
1073    parse_port_name_number_or_range($portstr, 0);
1074
1075    return $portstr;
1076 }
1077
1078 PVE::JSONSchema::register_format('pve-fw-dport-spec', \&pve_fw_verify_dport_spec);
1079 sub pve_fw_verify_dport_spec {
1080    my ($portstr) = @_;
1081
1082    parse_port_name_number_or_range($portstr, 1);
1083
1084    return $portstr;
1085 }
1086
1087 PVE::JSONSchema::register_format('pve-fw-addr-spec', \&pve_fw_verify_addr_spec);
1088 sub pve_fw_verify_addr_spec {
1089    my ($list) = @_;
1090
1091    parse_address_list($list);
1092
1093    return $list;
1094 }
1095
1096 PVE::JSONSchema::register_format('pve-fw-protocol-spec', \&pve_fw_verify_protocol_spec);
1097 sub pve_fw_verify_protocol_spec {
1098    my ($proto) = @_;
1099
1100    my $protocols = get_etc_protocols();
1101
1102    die "unknown protocol '$proto'\n" if $proto &&
1103        !(defined($protocols->{byname}->{$proto}) ||
1104          defined($protocols->{byid}->{$proto}));
1105
1106    return $proto;
1107 }
1108
1109
1110 # helper function for API
1111
1112 sub copy_opject_with_digest {
1113     my ($object) = @_;
1114
1115     my $sha = Digest::SHA->new('sha1');
1116
1117     my $res = {};
1118     foreach my $k (sort keys %$object) {
1119         my $v = $object->{$k};
1120         next if !defined($v);
1121         $res->{$k} = $v;
1122         $sha->add($k, ':', $v, "\n");
1123     }
1124
1125     my $digest = $sha->hexdigest;
1126
1127     $res->{digest} = $digest;
1128
1129     return wantarray ? ($res, $digest) : $res;
1130 }
1131
1132 sub copy_list_with_digest {
1133     my ($list) = @_;
1134
1135     my $sha = Digest::SHA->new('sha1');
1136
1137     my $res = [];
1138     foreach my $entry (@$list) {
1139         my $data = {};
1140         foreach my $k (sort keys %$entry) {
1141             my $v = $entry->{$k};
1142             next if !defined($v);
1143             $data->{$k} = $v;
1144             # Note: digest ignores refs ($rule->{errors})
1145             # since Digest::SHA expects a series of bytes,
1146             #  we have to encode the value here to prevent errors when
1147             #  using utf8 characters (eg. in comments)
1148             $sha->add($k, ':', encode_utf8($v), "\n") if !ref($v); ;
1149         }
1150         push @$res, $data;
1151     }
1152
1153     my $digest = $sha->hexdigest;
1154
1155     foreach my $entry (@$res) {
1156         $entry->{digest} = $digest;
1157     }
1158
1159     return wantarray ? ($res, $digest) : $res;
1160 }
1161
1162 our $cluster_option_properties = {
1163     enable => {
1164         description => "Enable or disable the firewall cluster wide.",
1165         type => 'integer',
1166         minimum => 0,
1167         optional => 1,
1168     },
1169     policy_in => {
1170         description => "Input policy.",
1171         type => 'string',
1172         optional => 1,
1173         enum => ['ACCEPT', 'REJECT', 'DROP'],
1174     },
1175     policy_out => {
1176         description => "Output policy.",
1177         type => 'string',
1178         optional => 1,
1179         enum => ['ACCEPT', 'REJECT', 'DROP'],
1180     },
1181 };
1182
1183 our $host_option_properties = {
1184     enable => {
1185         description => "Enable host firewall rules.",
1186         type => 'boolean',
1187         optional => 1,
1188     },
1189     log_level_in =>  get_standard_option('pve-fw-loglevel', {
1190         description => "Log level for incoming traffic." }),
1191     log_level_out =>  get_standard_option('pve-fw-loglevel', {
1192         description => "Log level for outgoing traffic." }),
1193     tcp_flags_log_level =>  get_standard_option('pve-fw-loglevel', {
1194         description => "Log level for illegal tcp flags filter." }),
1195     smurf_log_level =>  get_standard_option('pve-fw-loglevel', {
1196         description => "Log level for SMURFS filter." }),
1197     nosmurfs => {
1198         description => "Enable SMURFS filter.",
1199         type => 'boolean',
1200         optional => 1,
1201     },
1202     tcpflags => {
1203         description => "Filter illegal combinations of TCP flags.",
1204         type => 'boolean',
1205         optional => 1,
1206     },
1207     nf_conntrack_max => {
1208         description => "Maximum number of tracked connections.",
1209         type => 'integer',
1210         optional => 1,
1211         minimum => 32768,
1212     },
1213     nf_conntrack_tcp_timeout_established => {
1214         description => "Conntrack established timeout.",
1215         type => 'integer',
1216         optional => 1,
1217         minimum => 7875,
1218     },
1219     ndp => {
1220         description => "Enable NDP.",
1221         type => 'boolean',
1222         optional => 1,
1223     },
1224 };
1225
1226 our $vm_option_properties = {
1227     enable => {
1228         description => "Enable/disable firewall rules.",
1229         type => 'boolean',
1230         optional => 1,
1231     },
1232     macfilter => {
1233         description => "Enable/disable MAC address filter.",
1234         type => 'boolean',
1235         optional => 1,
1236     },
1237     dhcp => {
1238         description => "Enable DHCP.",
1239         type => 'boolean',
1240         optional => 1,
1241     },
1242     ndp => {
1243         description => "Enable NDP.",
1244         type => 'boolean',
1245         optional => 1,
1246     },
1247     radv => {
1248         description => "Allow sending Router Advertisement.",
1249         type => 'boolean',
1250         optional => 1,
1251     },
1252     ipfilter => {
1253         description => "Enable default IP filters. " .
1254            "This is equivalent to adding an empty ipfilter-net<id> ipset " .
1255            "for every interface. Such ipsets implicitly contain sane default " .
1256            "restrictions such as restricting IPv6 link local addresses to " .
1257            "the one derived from the interface's MAC address. For containers " .
1258            "the configured IP addresses will be implicitly added.",
1259         type => 'boolean',
1260         optional => 1,
1261     },
1262     policy_in => {
1263         description => "Input policy.",
1264         type => 'string',
1265         optional => 1,
1266         enum => ['ACCEPT', 'REJECT', 'DROP'],
1267     },
1268     policy_out => {
1269         description => "Output policy.",
1270         type => 'string',
1271         optional => 1,
1272         enum => ['ACCEPT', 'REJECT', 'DROP'],
1273     },
1274     log_level_in =>  get_standard_option('pve-fw-loglevel', {
1275         description => "Log level for incoming traffic." }),
1276     log_level_out =>  get_standard_option('pve-fw-loglevel', {
1277         description => "Log level for outgoing traffic." }),
1278
1279 };
1280
1281
1282 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.";
1283
1284 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.";
1285
1286 my $rule_properties = {
1287     pos => {
1288         description => "Update rule at position <pos>.",
1289         type => 'integer',
1290         minimum => 0,
1291         optional => 1,
1292     },
1293     digest => get_standard_option('pve-config-digest'),
1294     type => {
1295         description => "Rule type.",
1296         type => 'string',
1297         optional => 1,
1298         enum => ['in', 'out', 'group'],
1299     },
1300     action => {
1301         description => "Rule action ('ACCEPT', 'DROP', 'REJECT') or security group name.",
1302         type => 'string',
1303         optional => 1,
1304         pattern => $security_group_name_pattern,
1305         maxLength => 20,
1306         minLength => 2,
1307     },
1308     macro => {
1309         description => "Use predefined standard macro.",
1310         type => 'string',
1311         optional => 1,
1312         maxLength => 128,
1313     },
1314     iface => get_standard_option('pve-iface', {
1315         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.",
1316         optional => 1
1317     }),
1318     source => {
1319         description => "Restrict packet source address. $addr_list_descr",
1320         type => 'string', format => 'pve-fw-addr-spec',
1321         optional => 1,
1322     },
1323     dest => {
1324         description => "Restrict packet destination address. $addr_list_descr",
1325         type => 'string', format => 'pve-fw-addr-spec',
1326         optional => 1,
1327     },
1328     proto => {
1329         description => "IP protocol. You can use protocol names ('tcp'/'udp') or simple numbers, as defined in '/etc/protocols'.",
1330         type => 'string', format => 'pve-fw-protocol-spec',
1331         optional => 1,
1332     },
1333     enable => {
1334         description => "Flag to enable/disable a rule.",
1335         type => 'integer',
1336         minimum => 0,
1337         optional => 1,
1338     },
1339     sport => {
1340         description => "Restrict TCP/UDP source port. $port_descr",
1341         type => 'string', format => 'pve-fw-sport-spec',
1342         optional => 1,
1343     },
1344     dport => {
1345         description => "Restrict TCP/UDP destination port. $port_descr",
1346         type => 'string', format => 'pve-fw-dport-spec',
1347         optional => 1,
1348     },
1349     comment => {
1350         description => "Descriptive comment.",
1351         type => 'string',
1352         optional => 1,
1353     },
1354 };
1355
1356 sub add_rule_properties {
1357     my ($properties) = @_;
1358
1359     foreach my $k (keys %$rule_properties) {
1360         my $h = $rule_properties->{$k};
1361         # copy data, so that we can modify later without side effects
1362         foreach my $opt (keys %$h) { $properties->{$k}->{$opt} = $h->{$opt}; }
1363     }
1364
1365     return $properties;
1366 }
1367
1368 sub delete_rule_properties {
1369     my ($rule, $delete_str) = @_;
1370
1371     foreach my $opt (PVE::Tools::split_list($delete_str)) {
1372         raise_param_exc({ 'delete' => "no such property ('$opt')"})
1373             if !defined($rule_properties->{$opt});
1374         raise_param_exc({ 'delete' => "unable to delete required property '$opt'"})
1375             if $opt eq 'type' || $opt eq 'action';
1376         delete $rule->{$opt};
1377     }
1378
1379     return $rule;
1380 }
1381
1382 my $apply_macro = sub {
1383     my ($macro_name, $param, $verify, $ipversion) = @_;
1384
1385     my $macro_rules = $pve_fw_parsed_macros->{$macro_name};
1386     die "unknown macro '$macro_name'\n" if !$macro_rules; # should not happen
1387
1388     if ($ipversion && ($ipversion == 6) && $pve_ipv6fw_macros->{$macro_name}) {
1389         $macro_rules = $pve_ipv6fw_macros->{$macro_name};
1390     }
1391
1392     # skip macros which are specific to another ipversion
1393     if ($ipversion && (my $required = $pve_fw_macro_ipversion->{$macro_name})) {
1394         return if $ipversion != $required;
1395     }
1396
1397     my $rules = [];
1398
1399     foreach my $templ (@$macro_rules) {
1400         my $rule = {};
1401         my $param_used = {};
1402         foreach my $k (keys %$templ) {
1403             my $v = $templ->{$k};
1404             if ($v eq 'PARAM') {
1405                 $v = $param->{$k};
1406                 $param_used->{$k} = 1;
1407             } elsif ($v eq 'DEST') {
1408                 $v = $param->{dest};
1409                 $param_used->{dest} = 1;
1410             } elsif ($v eq 'SOURCE') {
1411                 $v = $param->{source};
1412                 $param_used->{source} = 1;
1413             }
1414
1415             if (!defined($v)) {
1416                 my $msg = "missing parameter '$k' in macro '$macro_name'";
1417                 raise_param_exc({ macro => $msg }) if $verify;
1418                 die "$msg\n";
1419             }
1420             $rule->{$k} = $v;
1421         }
1422         foreach my $k (keys %$param) {
1423             next if $k eq 'macro';
1424             next if !defined($param->{$k});
1425             next if $param_used->{$k};
1426             if (defined($rule->{$k})) {
1427                 if ($rule->{$k} ne $param->{$k}) {
1428                     my $msg = "parameter '$k' already define in macro (value = '$rule->{$k}')";
1429                     raise_param_exc({ $k => $msg }) if $verify;
1430                     die "$msg\n";
1431                 }
1432             } else {
1433                 $rule->{$k} = $param->{$k};
1434             }
1435         }
1436         push @$rules, $rule;
1437     }
1438
1439     return $rules;
1440 };
1441
1442 my $rule_env_iface_lookup = {
1443     'ct' => 1,
1444     'vm' => 1,
1445     'group' => 0,
1446     'cluster' => 1,
1447     'host' => 1,
1448 };
1449
1450 sub verify_rule {
1451     my ($rule, $cluster_conf, $fw_conf, $rule_env, $noerr) = @_;
1452
1453     my $allow_groups = $rule_env eq 'group' ? 0 : 1;
1454
1455     my $allow_iface = $rule_env_iface_lookup->{$rule_env};
1456     die "unknown rule_env '$rule_env'\n" if !defined($allow_iface); # should not happen
1457
1458     my $errors = $rule->{errors} || {};
1459
1460     my $error_count = 0;
1461
1462     my $add_error = sub {
1463         my ($param, $msg)  = @_;
1464         chomp $msg;
1465         raise_param_exc({ $param => $msg }) if !$noerr;
1466         $error_count++;
1467         $errors->{$param} = $msg if !$errors->{$param};
1468     };
1469
1470     my $ipversion;
1471     my $set_ip_version = sub {
1472         my $vers = shift;
1473         if ($vers) {
1474             die "detected mixed ipv4/ipv6 adresses in rule\n"
1475                 if $ipversion && ($vers != $ipversion);
1476             $ipversion = $vers;
1477         }
1478     };
1479
1480     my $check_ipset_or_alias_property = sub {
1481         my ($name, $expected_ipversion) = @_;
1482
1483         if (my $value = $rule->{$name}) {
1484             if ($value =~ m/^\+/) {
1485                 if ($value =~ m/^\+(${ipset_name_pattern})$/) {
1486                     &$add_error($name, "no such ipset '$1'")
1487                         if !($cluster_conf->{ipset}->{$1} || ($fw_conf && $fw_conf->{ipset}->{$1}));
1488
1489                 } else {
1490                     &$add_error($name, "invalid ipset name '$value'");
1491                 }
1492             } elsif ($value =~ m/^${ip_alias_pattern}$/){
1493                 my $alias = lc($value);
1494                 &$add_error($name, "no such alias '$value'")
1495                     if !($cluster_conf->{aliases}->{$alias} || ($fw_conf && $fw_conf->{aliases}->{$alias}));
1496                 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1497                 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1498
1499                 &$set_ip_version($e->{ipversion});
1500             }
1501         }
1502     };
1503
1504     my $type = $rule->{type};
1505     my $action = $rule->{action};
1506
1507     &$add_error('type', "missing property") if !$type;
1508     &$add_error('action', "missing property") if !$action;
1509
1510     if ($type) {
1511         if ($type eq  'in' || $type eq 'out') {
1512             &$add_error('action', "unknown action '$action'")
1513                 if $action && ($action !~ m/^(ACCEPT|DROP|REJECT)$/);
1514         } elsif ($type eq 'group') {
1515             &$add_error('type', "security groups not allowed")
1516                 if !$allow_groups;
1517             &$add_error('action', "invalid characters in security group name")
1518                 if $action && ($action !~ m/^${security_group_name_pattern}$/);
1519         } else {
1520             &$add_error('type', "unknown rule type '$type'");
1521         }
1522     }
1523
1524     if ($rule->{iface}) {
1525         &$add_error('type', "parameter -i not allowed for this rule type")
1526             if !$allow_iface;
1527         eval { PVE::JSONSchema::pve_verify_iface($rule->{iface}); };
1528         &$add_error('iface', $@) if $@;
1529         if ($rule_env eq 'vm' || $rule_env eq 'ct') {
1530             &$add_error('iface', "value does not match the regex pattern 'net\\d+'")
1531                 if $rule->{iface} !~  m/^net(\d+)$/;
1532         }
1533     }
1534
1535     if ($rule->{macro}) {
1536         if (my $preferred_name = $pve_fw_preferred_macro_names->{lc($rule->{macro})}) {
1537             $rule->{macro} = $preferred_name;
1538         } else {
1539             &$add_error('macro', "unknown macro '$rule->{macro}'");
1540         }
1541     }
1542
1543     if ($rule->{proto}) {
1544         eval { pve_fw_verify_protocol_spec($rule->{proto}); };
1545         &$add_error('proto', $@) if $@;
1546         &$set_ip_version(4) if $rule->{proto} eq 'icmp';
1547         &$set_ip_version(6) if $rule->{proto} eq 'icmpv6';
1548     }
1549
1550     if ($rule->{dport}) {
1551         eval { parse_port_name_number_or_range($rule->{dport}, 1); };
1552         &$add_error('dport', $@) if $@;
1553         my $proto = $rule->{proto};
1554         &$add_error('proto', "missing property - 'dport' requires this property")
1555             if !$proto;
1556         &$add_error('dport', "protocol '$proto' does not support ports")
1557             if !$PROTOCOLS_WITH_PORTS->{$proto} &&
1558                 $proto ne 'icmp' && $proto ne 'icmpv6'; # special cases
1559     }
1560
1561     if ($rule->{sport}) {
1562         eval { parse_port_name_number_or_range($rule->{sport}, 0); };
1563         &$add_error('sport', $@) if $@;
1564         my $proto = $rule->{proto};
1565         &$add_error('proto', "missing property - 'sport' requires this property")
1566             if !$proto;
1567         &$add_error('sport', "protocol '$proto' does not support ports")
1568             if !$PROTOCOLS_WITH_PORTS->{$proto};
1569     }
1570
1571     if ($rule->{source}) {
1572         eval {
1573             my $source_ipversion = parse_address_list($rule->{source});
1574             &$set_ip_version($source_ipversion);
1575         };
1576         &$add_error('source', $@) if $@;
1577         &$check_ipset_or_alias_property('source', $ipversion);
1578     }
1579
1580     if ($rule->{dest}) {
1581         eval {
1582             my $dest_ipversion = parse_address_list($rule->{dest});
1583             &$set_ip_version($dest_ipversion);
1584         };
1585         &$add_error('dest', $@) if $@;
1586         &$check_ipset_or_alias_property('dest', $ipversion);
1587     }
1588
1589     $rule->{ipversion} = $ipversion if $ipversion;
1590
1591     if ($rule->{macro} && !$error_count) {
1592         eval { &$apply_macro($rule->{macro}, $rule, 1, $ipversion); };
1593         if (my $err = $@) {
1594             if (ref($err) eq "PVE::Exception" && $err->{errors}) {
1595                 my $eh = $err->{errors};
1596                 foreach my $p (keys %$eh) {
1597                     &$add_error($p, $eh->{$p});
1598                 }
1599             } else {
1600                 &$add_error('macro', "$err");
1601             }
1602         }
1603     }
1604
1605     $rule->{errors} = $errors if $error_count;
1606
1607     return $rule;
1608 }
1609
1610 sub copy_rule_data {
1611     my ($rule, $param) = @_;
1612
1613     foreach my $k (keys %$rule_properties) {
1614         if (defined(my $v = $param->{$k})) {
1615             if ($v eq '' || $v eq '-') {
1616                 delete $rule->{$k};
1617             } else {
1618                 $rule->{$k} = $v;
1619             }
1620         }
1621     }
1622
1623     return $rule;
1624 }
1625
1626 sub rules_modify_permissions {
1627     my ($rule_env) = @_;
1628
1629     if ($rule_env eq 'host') {
1630         return {
1631             check => ['perm', '/nodes/{node}', [ 'Sys.Modify' ]],
1632         };
1633     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1634         return {
1635             check => ['perm', '/', [ 'Sys.Modify' ]],
1636         };
1637     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1638         return {
1639             check => ['perm', '/vms/{vmid}', [ 'VM.Config.Network' ]],
1640         }
1641     }
1642
1643     return undef;
1644 }
1645
1646 sub rules_audit_permissions {
1647     my ($rule_env) = @_;
1648
1649     if ($rule_env eq 'host') {
1650         return {
1651             check => ['perm', '/nodes/{node}', [ 'Sys.Audit' ]],
1652         };
1653     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1654         return {
1655             check => ['perm', '/', [ 'Sys.Audit' ]],
1656         };
1657     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1658         return {
1659             check => ['perm', '/vms/{vmid}', [ 'VM.Audit' ]],
1660         }
1661     }
1662
1663     return undef;
1664 }
1665
1666 # core functions
1667 my $bridge_firewall_enabled = 0;
1668
1669 sub enable_bridge_firewall {
1670
1671     return if $bridge_firewall_enabled; # only once
1672
1673     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
1674     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
1675
1676     # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
1677     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
1678
1679     $bridge_firewall_enabled = 1;
1680 }
1681
1682 sub iptables_restore_cmdlist {
1683     my ($cmdlist) = @_;
1684
1685     run_command("/sbin/iptables-restore -n", input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1686 }
1687
1688 sub ip6tables_restore_cmdlist {
1689     my ($cmdlist) = @_;
1690
1691     run_command("/sbin/ip6tables-restore -n", input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1692 }
1693
1694 sub ipset_restore_cmdlist {
1695     my ($cmdlist) = @_;
1696
1697     run_command("/sbin/ipset restore", input => $cmdlist, errmsg => "ipset_restore_cmdlist");
1698 }
1699
1700 sub iptables_get_chains {
1701     my ($iptablescmd) = @_;
1702
1703     $iptablescmd = "iptables" if !$iptablescmd;
1704
1705     my $res = {};
1706
1707     # check what chains we want to track
1708     my $is_pvefw_chain = sub {
1709         my $name = shift;
1710
1711         return 1 if $name =~ m/^PVEFW-\S+$/;
1712
1713         return 1 if $name =~ m/^tap\d+i\d+-(?:IN|OUT)$/;
1714
1715         return 1 if $name =~ m/^veth\d+i\d+-(?:IN|OUT)$/;
1716
1717         return 1 if $name =~ m/^fwbr\d+(v\d+)?-(?:FW|IN|OUT|IPS)$/;
1718         return 1 if $name =~ m/^GROUP-(?:$security_group_name_pattern)-(?:IN|OUT)$/;
1719
1720         return undef;
1721     };
1722
1723     my $table = '';
1724
1725     my $hooks = {};
1726
1727     my $parser = sub {
1728         my $line = shift;
1729
1730         return if $line =~ m/^#/;
1731         return if $line =~ m/^\s*$/;
1732
1733         if ($line =~ m/^\*(\S+)$/) {
1734             $table = $1;
1735             return;
1736         }
1737
1738         return if $table ne 'filter';
1739
1740         if ($line =~ m/^:(\S+)\s/) {
1741             my $chain = $1;
1742             return if !&$is_pvefw_chain($chain);
1743             $res->{$chain} = "unknown";
1744         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
1745             my ($chain, $sig) = ($1, $2);
1746             return if !&$is_pvefw_chain($chain);
1747             $res->{$chain} = $sig;
1748         } elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD)\s+-j\s+PVEFW-\1$/) {
1749             $hooks->{$1} = 1;
1750         } else {
1751             # simply ignore the rest
1752             return;
1753         }
1754     };
1755
1756     run_command("/sbin/$iptablescmd-save", outfunc => $parser);
1757
1758     return wantarray ? ($res, $hooks) : $res;
1759 }
1760
1761 sub iptables_chain_digest {
1762     my ($rules) = @_;
1763     my $digest = Digest::SHA->new('sha1');
1764     foreach my $rule (@$rules) { # order is important
1765         $digest->add($rule);
1766     }
1767     return $digest->b64digest;
1768 }
1769
1770 sub ipset_chain_digest {
1771     my ($rules) = @_;
1772
1773     my $digest = Digest::SHA->new('sha1');
1774     foreach my $rule (sort @$rules) { # note: sorted
1775         $digest->add($rule);
1776     }
1777     return $digest->b64digest;
1778 }
1779
1780 sub ipset_get_chains {
1781
1782     my $res = {};
1783     my $chains = {};
1784
1785     my $parser = sub {
1786         my $line = shift;
1787
1788         return if $line =~ m/^#/;
1789         return if $line =~ m/^\s*$/;
1790         if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
1791             my $chain = $1;
1792             $line =~ s/\s+$//; # delete trailing white space
1793             push @{$chains->{$chain}}, $line;
1794         } else {
1795             # simply ignore the rest
1796             return;
1797         }
1798     };
1799
1800     run_command("/sbin/ipset save", outfunc => $parser);
1801
1802     # compute digest for each chain
1803     foreach my $chain (keys %$chains) {
1804         $res->{$chain} = ipset_chain_digest($chains->{$chain});
1805     }
1806
1807     return $res;
1808 }
1809
1810 # substitude action of rule according to action hash
1811 sub rule_substitude_action {
1812     my ($rule, $actions) = @_;
1813
1814     if (my $action = $rule->{action}) {
1815         $rule->{action} = $actions->{$action} if defined($actions->{$action});
1816     }
1817 }
1818
1819 # generate a src or dst match
1820 # $dir(ection) is either d or s
1821 sub ipt_gen_src_or_dst_match {
1822     my ($adr, $dir, $ipversion, $cluster_conf, $fw_conf) = @_;
1823
1824     my $srcdst;
1825     if ($dir eq 's') {
1826         $srcdst = "src";
1827     } elsif ($dir eq 'd') {
1828         $srcdst = "dst";
1829     } else {
1830         die "ipt_gen_src_or_dst_match: invalid direction $dir \n";
1831     }
1832
1833     my $match;
1834     if ($adr =~ m/^\+/) {
1835         if ($adr =~ m/^\+(${ipset_name_pattern})$/) {
1836             my $name = $1;
1837             my $ipset_chain;
1838             if ($fw_conf && $fw_conf->{ipset}->{$name}) {
1839                 $ipset_chain = compute_ipset_chain_name($fw_conf->{vmid}, $name, $ipversion);
1840             } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
1841                 $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
1842             } else {
1843                 die "no such ipset '$name'\n";
1844             }
1845             $match = "-m set --match-set ${ipset_chain} ${srcdst}";
1846         } else {
1847             die "invalid security group name '$adr'\n";
1848         }
1849     } elsif ($adr =~ m/^${ip_alias_pattern}$/){
1850         my $alias = lc($adr);
1851         my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1852         $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1853         die "no such alias '$adr'\n" if !$e;
1854         $match = "-${dir} $e->{cidr}";
1855     } elsif ($adr =~ m/\-/){
1856         $match = "-m iprange --${srcdst}-range $adr";
1857     } else {
1858         $match = "-${dir} $adr";
1859     }
1860
1861     return $match;
1862 }
1863
1864 # convert a %rule to an array of iptables commands
1865 sub ipt_rule_to_cmds {
1866     my ($rule, $chain, $ipversion, $cluster_conf, $fw_conf, $vmid) = @_;
1867
1868     die "ipt_rule_to_cmds unable to handle macro" if $rule->{macro}; #should not happen
1869
1870     my @match = ();
1871
1872     if (defined $rule->{match}) {
1873         push @match, $rule->{match};
1874     } else {
1875         push @match, "-i $rule->{iface_in}" if $rule->{iface_in};
1876         push @match, "-o $rule->{iface_out}" if $rule->{iface_out};
1877
1878         if ($rule->{source}) {
1879             push @match, ipt_gen_src_or_dst_match($rule->{source}, 's', $ipversion, $cluster_conf, $fw_conf);
1880         }
1881         if ($rule->{dest}) {
1882             push @match, ipt_gen_src_or_dst_match($rule->{dest}, 'd', $ipversion, $cluster_conf, $fw_conf);
1883         }
1884
1885         if (my $proto = $rule->{proto}) {
1886             push @match, "-p $proto";
1887
1888             my $nbdport = defined($rule->{dport}) ? parse_port_name_number_or_range($rule->{dport}, 1) : 0;
1889             my $nbsport = defined($rule->{sport}) ? parse_port_name_number_or_range($rule->{sport}, 0) : 0;
1890
1891             my $multiport = 0;
1892             $multiport++ if $nbdport > 1;
1893             $multiport++ if $nbsport > 1;
1894
1895             push @match, "--match multiport" if $multiport;
1896
1897             die "multiport: option '--sports' cannot be used together with '--dports'\n"
1898                 if ($multiport == 2) && ($rule->{dport} ne $rule->{sport});
1899
1900             if ($rule->{dport}) {
1901                 if ($proto eq 'icmp') {
1902                     # Note: we use dport to store --icmp-type
1903                     die "unknown icmp-type '$rule->{dport}'\n"
1904                         if $rule->{dport} !~ /^\d+$/ && !defined($icmp_type_names->{$rule->{dport}});
1905                     push @match, "-m icmp --icmp-type $rule->{dport}";
1906                 } elsif ($proto eq 'icmpv6') {
1907                     # Note: we use dport to store --icmpv6-type
1908                     die "unknown icmpv6-type '$rule->{dport}'\n"
1909                         if $rule->{dport} !~ /^\d+$/ && !defined($icmpv6_type_names->{$rule->{dport}});
1910                     push @match, "-m icmpv6 --icmpv6-type $rule->{dport}";
1911                 } elsif (!$PROTOCOLS_WITH_PORTS->{$proto}) {
1912                     die "protocol $proto does not have ports\n";
1913                 } else {
1914                     if ($nbdport > 1) {
1915                         if ($multiport == 2) {
1916                             push @match,  "--ports $rule->{dport}";
1917                         } else {
1918                             push @match, "--dports $rule->{dport}";
1919                         }
1920                     } else {
1921                         push @match, "--dport $rule->{dport}";
1922                     }
1923                 }
1924             }
1925
1926             if ($rule->{sport}) {
1927                 die "protocol $proto does not have ports\n"
1928                     if !$PROTOCOLS_WITH_PORTS->{$proto};
1929                 if ($nbsport > 1) {
1930                     push @match, "--sports $rule->{sport}" if $multiport != 2;
1931                 } else {
1932                     push @match, "--sport $rule->{sport}";
1933                 }
1934             }
1935         } elsif ($rule->{dport} || $rule->{sport}) {
1936             die "destination port '$rule->{dport}', but no protocol specified\n" if $rule->{dport};
1937             die "source port '$rule->{sport}', but no protocol specified\n" if $rule->{sport};
1938         }
1939
1940         push @match, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
1941     }
1942     my $matchstr = scalar(@match) ? join(' ', @match) : "";
1943
1944     my $targetstr;
1945     if (defined $rule->{target}) {
1946         $targetstr = $rule->{target};
1947     } else {
1948         my $action = (defined $rule->{action}) ? $rule->{action} : "";
1949         my $goto = 1 if $action eq 'PVEFW-SET-ACCEPT-MARK';
1950         $targetstr = ($goto) ? "-g $action" : "-j $action";
1951     }
1952
1953     my @iptcmds;
1954     if (defined $rule->{log} && $rule->{log}) {
1955         my $logaction = get_log_rule_base($chain, $vmid, $rule->{logmsg}, $rule->{log});
1956         push @iptcmds, "-A $chain $matchstr $logaction";
1957     }
1958     push @iptcmds, "-A $chain $matchstr $targetstr";
1959     return @iptcmds;
1960 }
1961
1962 sub ruleset_generate_rule {
1963     my ($ruleset, $chain, $ipversion, $rule, $cluster_conf, $fw_conf) = @_;
1964
1965     my $rules;
1966
1967     if ($rule->{macro}) {
1968         $rules = &$apply_macro($rule->{macro}, $rule, 0, $ipversion);
1969     } else {
1970         $rules = [ $rule ];
1971     }
1972
1973     # update all or nothing
1974     my @ipt_rule_cmds;
1975     foreach my $r (@$rules) {
1976         push @ipt_rule_cmds, ipt_rule_to_cmds($r, $chain, $ipversion, $cluster_conf, $fw_conf);
1977     }
1978     foreach my $c (@ipt_rule_cmds) {
1979         ruleset_add_ipt_cmd($ruleset, $chain, $c);
1980     }
1981 }
1982
1983 sub ruleset_create_chain {
1984     my ($ruleset, $chain) = @_;
1985
1986     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
1987     die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
1988
1989     die "chain '$chain' already exists\n" if $ruleset->{$chain};
1990
1991     $ruleset->{$chain} = [];
1992 }
1993
1994 sub ruleset_chain_exist {
1995     my ($ruleset, $chain) = @_;
1996
1997     return $ruleset->{$chain} ? 1 : undef;
1998 }
1999
2000 # add an iptables command (like generated by ipt_rule_to_cmds) to a chain
2001 sub ruleset_add_ipt_cmd {
2002    my ($ruleset, $chain, $iptcmd) = @_;
2003
2004    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2005
2006    push @{$ruleset->{$chain}}, $iptcmd;
2007 }
2008
2009 sub ruleset_addrule {
2010    my ($ruleset, $chain, $match, $action, $log, $logmsg, $vmid) = @_;
2011
2012    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2013
2014    if (defined($log) && $log) {
2015         my $logaction = get_log_rule_base($chain, $vmid, $logmsg, $log);
2016         push @{$ruleset->{$chain}}, "-A $chain $match $logaction";
2017    }
2018    push @{$ruleset->{$chain}}, "-A $chain $match $action";
2019 }
2020
2021 sub ruleset_insertrule {
2022    my ($ruleset, $chain, $match, $action, $log) = @_;
2023
2024    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2025
2026    unshift @{$ruleset->{$chain}}, "-A $chain $match $action";
2027 }
2028
2029 sub get_log_rule_base {
2030     my ($chain, $vmid, $msg, $loglevel) = @_;
2031
2032     $vmid = 0 if !defined($vmid);
2033     $msg = "" if !defined($msg);
2034
2035     # Note: we use special format for prefix to pass further
2036     # info to log daemon (VMID, LOGLEVEL and CHAIN)
2037
2038     return "-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
2039 }
2040
2041 sub ruleset_add_chain_policy {
2042     my ($ruleset, $chain, $ipversion, $vmid, $policy, $loglevel, $accept_action) = @_;
2043
2044     if ($policy eq 'ACCEPT') {
2045
2046         my $rule = { action => 'ACCEPT' };
2047         rule_substitude_action($rule, { ACCEPT =>  $accept_action});
2048         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule);
2049
2050     } elsif ($policy eq 'DROP') {
2051
2052         ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Drop");
2053
2054         ruleset_addrule($ruleset, $chain, "", "-j DROP", $loglevel, "policy $policy: ", $vmid);
2055     } elsif ($policy eq 'REJECT') {
2056         ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Reject");
2057
2058         ruleset_addrule($ruleset, $chain, "", "-g PVEFW-reject", $loglevel, "policy $policy:", $vmid);
2059     } else {
2060         # should not happen
2061         die "internal error: unknown policy '$policy'";
2062     }
2063 }
2064
2065 sub ruleset_chain_add_ndp {
2066     my ($ruleset, $chain, $ipversion, $options, $direction, $accept) = @_;
2067     return if $ipversion != 6 || (defined($options->{ndp}) && !$options->{ndp});
2068
2069     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-solicitation", $accept);
2070     if ($direction ne 'OUT' || $options->{radv}) {
2071         ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", $accept);
2072     }
2073     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-solicitation", $accept);
2074     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-advertisement", $accept);
2075 }
2076
2077 sub ruleset_chain_add_conn_filters {
2078     my ($ruleset, $chain, $accept) = @_;
2079
2080     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID", "-j DROP");
2081     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED", "-j $accept");
2082 }
2083
2084 sub ruleset_chain_add_input_filters {
2085     my ($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel) = @_;
2086
2087     if ($cluster_conf->{ipset}->{blacklist}){
2088         if (!ruleset_chain_exist($ruleset, "PVEFW-blacklist")) {
2089             ruleset_create_chain($ruleset, "PVEFW-blacklist");
2090             ruleset_addrule($ruleset, "PVEFW-blacklist", "", "-j DROP", $loglevel, "DROP: ");
2091         }
2092         my $ipset_chain = compute_ipset_chain_name(0, 'blacklist', $ipversion);
2093         ruleset_addrule($ruleset, $chain, "-m set --match-set ${ipset_chain} src", "-j PVEFW-blacklist");
2094     }
2095
2096     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
2097         if ($ipversion == 4) {
2098             ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW", "-j PVEFW-smurfs");
2099         }
2100     }
2101
2102     if ($options->{tcpflags}) {
2103         ruleset_addrule($ruleset, $chain, "-p tcp", "-j PVEFW-tcpflags");
2104     }
2105 }
2106
2107 sub ruleset_create_vm_chain {
2108     my ($ruleset, $chain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction) = @_;
2109
2110     ruleset_create_chain($ruleset, $chain);
2111     my $accept = generate_nfqueue($options);
2112
2113     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
2114         if ($ipversion == 4) {
2115             if ($direction eq 'OUT') {
2116                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2117                                       { action => 'PVEFW-SET-ACCEPT-MARK',
2118                                         proto => 'udp', sport => 68, dport => 67 });
2119             } else {
2120                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2121                                       { action => 'ACCEPT',
2122                                         proto => 'udp', sport => 67, dport => 68 });
2123             }
2124         } elsif ($ipversion == 6) {
2125             if ($direction eq 'OUT') {
2126                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2127                                       { action => 'PVEFW-SET-ACCEPT-MARK',
2128                                         proto => 'udp', sport => 546, dport => 547 });
2129             } else {
2130                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2131                                       { action => 'ACCEPT',
2132                                         proto => 'udp', sport => 547, dport => 546 });
2133             }
2134         }
2135
2136     }
2137
2138     if ($direction eq 'OUT') {
2139         if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
2140             ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr", "-j DROP");
2141         }
2142         if ($ipversion == 6 && !$options->{radv}) {
2143             ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", "-j DROP");
2144         }
2145         if ($ipfilter_ipset) {
2146             ruleset_addrule($ruleset, $chain, "-m set ! --match-set $ipfilter_ipset src", "-j DROP");
2147         }
2148         ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2149     }
2150
2151     my $accept_action = $direction eq 'OUT' ? '-g PVEFW-SET-ACCEPT-MARK' : "-j $accept";
2152     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, $direction, $accept_action);
2153 }
2154
2155 sub ruleset_add_group_rule {
2156     my ($ruleset, $cluster_conf, $chain, $rule, $direction, $action, $ipversion) = @_;
2157
2158     my $group = $rule->{action};
2159     my $group_chain = "GROUP-$group-$direction";
2160     if(!ruleset_chain_exist($ruleset, $group_chain)){
2161         generate_group_rules($ruleset, $cluster_conf, $group, $ipversion);
2162     }
2163
2164     if ($direction eq 'OUT' && $rule->{iface_out}) {
2165         ruleset_addrule($ruleset, $chain, "-o $rule->{iface_out}", "-j $group_chain");
2166     } elsif ($direction eq 'IN' && $rule->{iface_in}) {
2167         ruleset_addrule($ruleset, $chain, "-i $rule->{iface_in}", "-j $group_chain");
2168     } else {
2169         ruleset_addrule($ruleset, $chain, "", "-j $group_chain");
2170     }
2171
2172     ruleset_addrule($ruleset, $chain, "-m mark --mark $FWACCEPTMARK_ON", "-j $action");
2173 }
2174
2175 sub ruleset_generate_vm_rules {
2176     my ($ruleset, $rules, $cluster_conf, $vmfw_conf, $chain, $netid, $direction, $options, $ipversion) = @_;
2177
2178     my $lc_direction = lc($direction);
2179
2180     my $in_accept = generate_nfqueue($options);
2181
2182     foreach my $rule (@$rules) {
2183         next if $rule->{iface} && $rule->{iface} ne $netid;
2184         next if !$rule->{enable} || $rule->{errors};
2185         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2186
2187         if ($rule->{type} eq 'group') {
2188             ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, $direction,
2189                                    $direction eq 'OUT' ? 'RETURN' : $in_accept, $ipversion);
2190         } else {
2191             next if $rule->{type} ne $lc_direction;
2192             eval {
2193                 if ($direction eq 'OUT') {
2194                     rule_substitude_action($rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
2195                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $vmfw_conf);
2196                 } else {
2197                     rule_substitude_action($rule, { ACCEPT => $in_accept , REJECT => "PVEFW-reject" });
2198                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $vmfw_conf);
2199                 }
2200             };
2201             warn $@ if $@;
2202         }
2203     }
2204 }
2205
2206 sub generate_nfqueue {
2207     my ($options) = @_;
2208
2209     if ($options->{ips}) {
2210         my $action = "NFQUEUE";
2211         if ($options->{ips_queues} && $options->{ips_queues} =~ m/^(\d+)(:(\d+))?$/) {
2212             if (defined($3) && defined($1)) {
2213                 $action .= " --queue-balance $1:$3";
2214             } elsif (defined($1)) {
2215                 $action .= " --queue-num $1";
2216             }
2217         }
2218         $action .= " --queue-bypass" if $feature_ipset_nomatch; #need kernel 3.10
2219         return $action;
2220     } else {
2221         return "ACCEPT";
2222     }
2223 }
2224
2225 sub ruleset_generate_vm_ipsrules {
2226     my ($ruleset, $options, $direction, $iface) = @_;
2227
2228     if ($options->{ips} && $direction eq 'IN') {
2229         my $nfqueue = generate_nfqueue($options);
2230
2231         if (!ruleset_chain_exist($ruleset, "PVEFW-IPS")) {
2232             ruleset_create_chain($ruleset, "PVEFW-IPS");
2233         }
2234
2235         ruleset_addrule($ruleset, "PVEFW-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged", "-j $nfqueue");
2236     }
2237 }
2238
2239 sub generate_tap_rules_direction {
2240     my ($ruleset, $cluster_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $direction, $ipversion) = @_;
2241
2242     my $lc_direction = lc($direction);
2243
2244     my $rules = $vmfw_conf->{rules};
2245
2246     my $options = $vmfw_conf->{options};
2247     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
2248
2249     my $tapchain = "$iface-$direction";
2250
2251     my $ipfilter_name = compute_ipfilter_ipset_name($netid);
2252     my $ipfilter_ipset = compute_ipset_chain_name($vmid, $ipfilter_name, $ipversion)
2253         if $options->{ipfilter} || $vmfw_conf->{ipset}->{$ipfilter_name};
2254
2255     # create chain with mac and ip filter
2256     ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
2257
2258     if ($options->{enable}) {
2259         ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $tapchain, $netid, $direction, $options, $ipversion);
2260
2261         ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface);
2262
2263         # implement policy
2264         my $policy;
2265
2266         if ($direction eq 'OUT') {
2267             $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
2268         } else {
2269         $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
2270         }
2271
2272         my $accept = generate_nfqueue($options);
2273         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
2274         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, $policy, $loglevel, $accept_action);
2275     } else {
2276         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : 'ACCEPT';
2277         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, 'ACCEPT', $loglevel, $accept_action);
2278     }
2279
2280     # plug the tap chain to bridge chain
2281     if ($direction eq 'IN') {
2282         ruleset_addrule($ruleset, "PVEFW-FWBR-IN",
2283                         "-m physdev --physdev-is-bridged --physdev-out $iface", "-j $tapchain");
2284     } else {
2285         ruleset_addrule($ruleset, "PVEFW-FWBR-OUT",
2286                         "-m physdev --physdev-is-bridged --physdev-in $iface", "-j $tapchain");
2287     }
2288 }
2289
2290 sub enable_host_firewall {
2291     my ($ruleset, $hostfw_conf, $cluster_conf, $ipversion) = @_;
2292
2293     my $options = $hostfw_conf->{options};
2294     my $cluster_options = $cluster_conf->{options};
2295     my $rules = $hostfw_conf->{rules};
2296     my $cluster_rules = $cluster_conf->{rules};
2297
2298     # host inbound firewall
2299     my $chain = "PVEFW-HOST-IN";
2300     ruleset_create_chain($ruleset, $chain);
2301
2302     my $loglevel = get_option_log_level($options, "log_level_in");
2303
2304     ruleset_addrule($ruleset, $chain, "-i lo", "-j ACCEPT");
2305
2306     ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
2307     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'IN', '-j RETURN');
2308     ruleset_chain_add_input_filters($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel);
2309
2310     # we use RETURN because we need to check also tap rules
2311     my $accept_action = 'RETURN';
2312
2313     ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
2314
2315     # add host rules first, so that cluster wide rules can be overwritten
2316     foreach my $rule (@$rules, @$cluster_rules) {
2317         next if !$rule->{enable} || $rule->{errors};
2318         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2319
2320         $rule->{iface_in} = $rule->{iface} if $rule->{iface};
2321
2322         eval {
2323             if ($rule->{type} eq 'group') {
2324                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'IN', $accept_action, $ipversion);
2325             } elsif ($rule->{type} eq 'in') {
2326                 rule_substitude_action($rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
2327                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $hostfw_conf);
2328             }
2329         };
2330         warn $@ if $@;
2331         delete $rule->{iface_in};
2332     }
2333
2334     # allow standard traffic for management ipset (includes cluster network)
2335     my $mngmnt_ipset_chain = compute_ipset_chain_name(0, "management", $ipversion);
2336     my $mngmntsrc = "-m set --match-set ${mngmnt_ipset_chain} src";
2337     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 8006", "-j $accept_action");  # PVE API
2338     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
2339     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
2340     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 22", "-j $accept_action");  # SSH
2341
2342     my $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
2343     my $localnet_ver = $cluster_conf->{aliases}->{local_network}->{ipversion};
2344
2345     # corosync
2346     if ($localnet && ($ipversion == $localnet_ver)) {
2347         my $corosync_rule = "-p udp --dport 5404:5405";
2348         ruleset_addrule($ruleset, $chain, "-s $localnet -d $localnet $corosync_rule", "-j $accept_action");
2349         ruleset_addrule($ruleset, $chain, "-s $localnet -m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action");
2350     }
2351
2352     # implement input policy
2353     my $policy = $cluster_options->{policy_in} || 'DROP'; # allow nothing by default
2354     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2355
2356     # host outbound firewall
2357     $chain = "PVEFW-HOST-OUT";
2358     ruleset_create_chain($ruleset, $chain);
2359
2360     $loglevel = get_option_log_level($options, "log_level_out");
2361
2362     ruleset_addrule($ruleset, $chain, "-o lo", "-j ACCEPT");
2363
2364     ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
2365
2366     # we use RETURN because we may want to check other thigs later
2367     $accept_action = 'RETURN';
2368     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'OUT', "-j $accept_action");
2369
2370     ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
2371
2372     # add host rules first, so that cluster wide rules can be overwritten
2373     foreach my $rule (@$rules, @$cluster_rules) {
2374         next if !$rule->{enable} || $rule->{errors};
2375         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2376
2377         $rule->{iface_out} = $rule->{iface} if $rule->{iface};
2378         eval {
2379             if ($rule->{type} eq 'group') {
2380                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'OUT', $accept_action, $ipversion);
2381             } elsif ($rule->{type} eq 'out') {
2382                 rule_substitude_action($rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
2383                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $hostfw_conf);
2384             }
2385         };
2386         warn $@ if $@;
2387         delete $rule->{iface_out};
2388     }
2389
2390     # allow standard traffic on cluster network
2391     if ($localnet && ($ipversion == $localnet_ver)) {
2392         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 8006", "-j $accept_action");  # PVE API
2393         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 22", "-j $accept_action");  # SSH
2394         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
2395         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
2396
2397         my $corosync_rule = "-p udp --dport 5404:5405";
2398         ruleset_addrule($ruleset, $chain, "-d $localnet $corosync_rule", "-j $accept_action");
2399         ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action");
2400     }
2401
2402     # implement output policy
2403     $policy = $cluster_options->{policy_out} || 'ACCEPT'; # allow everything by default
2404     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2405
2406     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "", "-j PVEFW-HOST-OUT");
2407     ruleset_addrule($ruleset, "PVEFW-INPUT", "", "-j PVEFW-HOST-IN");
2408 }
2409
2410 sub generate_group_rules {
2411     my ($ruleset, $cluster_conf, $group, $ipversion) = @_;
2412
2413     my $rules = $cluster_conf->{groups}->{$group};
2414
2415     if (!$rules) {
2416         warn "no such security group '$group'\n";
2417         $rules = []; # create empty chain
2418     }
2419
2420     my $chain = "GROUP-${group}-IN";
2421
2422     ruleset_create_chain($ruleset, $chain);
2423     ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2424
2425     foreach my $rule (@$rules) {
2426         next if $rule->{type} ne 'in';
2427         next if !$rule->{enable} || $rule->{errors};
2428         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2429         rule_substitude_action($rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
2430         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf);
2431     }
2432
2433     $chain = "GROUP-${group}-OUT";
2434
2435     ruleset_create_chain($ruleset, $chain);
2436     ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2437
2438     foreach my $rule (@$rules) {
2439         next if $rule->{type} ne 'out';
2440         next if !$rule->{enable} || $rule->{errors};
2441         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2442         # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
2443         # check also other tap rules later
2444         rule_substitude_action($rule, { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" });
2445         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf);
2446     }
2447 }
2448
2449 my $MAX_NETS = 32;
2450 my $valid_netdev_names = {};
2451 for (my $i = 0; $i < $MAX_NETS; $i++)  {
2452     $valid_netdev_names->{"net$i"} = 1;
2453 }
2454
2455 sub get_mark_values {
2456     my ($value, $mask) = @_;
2457     $value = hex($value) if $value =~ /^0x/;
2458     $mask = hex($mask) if defined($mask) && $mask =~ /^0x/;
2459     $mask = 0xffffffff if !defined($mask);
2460     return ($value, $mask);
2461 }
2462
2463 sub parse_fw_rule {
2464     my ($prefix, $line, $cluster_conf, $fw_conf, $rule_env, $verbose) = @_;
2465
2466     my $orig_line = $line;
2467
2468     my $rule = {};
2469
2470     # we can add single line comments to the end of the rule
2471     if ($line =~ s/#\s*(.*?)\s*$//) {
2472         $rule->{comment} = decode('utf8', $1);
2473     }
2474
2475     # we can disable a rule when prefixed with '|'
2476
2477     $rule->{enable} = $line =~ s/^\|// ? 0 : 1;
2478
2479     $line =~ s/^(\S+)\s+(\S+)\s*// ||
2480         die "unable to parse rule: $line\n";
2481
2482     $rule->{type} = lc($1);
2483     $rule->{action} = $2;
2484
2485     if ($rule->{type} eq  'in' || $rule->{type} eq 'out') {
2486         if ($rule->{action} =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
2487             $rule->{macro} = $1;
2488             $rule->{action} = $2;
2489         }
2490     }
2491
2492     while (length($line)) {
2493         if ($line =~ s/^-i (\S+)\s*//) {
2494             $rule->{iface} = $1;
2495             next;
2496         }
2497
2498         last if $rule->{type} eq 'group';
2499
2500         if ($line =~ s/^-p (\S+)\s*//) {
2501             $rule->{proto} = $1;
2502             next;
2503         }
2504
2505         if ($line =~ s/^-dport (\S+)\s*//) {
2506             $rule->{dport} = $1;
2507             next;
2508         }
2509
2510         if ($line =~ s/^-sport (\S+)\s*//) {
2511             $rule->{sport} = $1;
2512             next;
2513         }
2514         if ($line =~ s/^-source (\S+)\s*//) {
2515             $rule->{source} = $1;
2516             next;
2517         }
2518         if ($line =~ s/^-dest (\S+)\s*//) {
2519             $rule->{dest} = $1;
2520             next;
2521         }
2522
2523         last;
2524     }
2525
2526     die "unable to parse rule parameters: $line\n" if length($line);
2527
2528     $rule = verify_rule($rule, $cluster_conf, $fw_conf, $rule_env, 1);
2529     if ($rule->{errors}) {
2530         # The verbose flag really means we're running from the CLI and want
2531         # output on the console - in the other case we really want such errors
2532         # to go into the syslog instead.
2533         my $log = $verbose ? sub { warn @_ } : sub { syslog(err => @_) };
2534         $log->("$prefix - errors in rule parameters: $orig_line\n");
2535         foreach my $p (keys %{$rule->{errors}}) {
2536             $log->("  $p: $rule->{errors}->{$p}\n");
2537         }
2538     }
2539
2540     return $rule;
2541 }
2542
2543 sub parse_vmfw_option {
2544     my ($line) = @_;
2545
2546     my ($opt, $value);
2547
2548     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2549
2550     if ($line =~ m/^(enable|dhcp|ndp|radv|macfilter|ipfilter|ips):\s*(0|1)\s*$/i) {
2551         $opt = lc($1);
2552         $value = int($2);
2553     } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
2554         $opt = lc($1);
2555         $value = $2 ? lc($3) : '';
2556     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2557         $opt = lc($1);
2558         $value = uc($3);
2559     } elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
2560         $opt = lc($1);
2561         $value = $2;
2562     } else {
2563         die "can't parse option '$line'\n"
2564     }
2565
2566     return ($opt, $value);
2567 }
2568
2569 sub parse_hostfw_option {
2570     my ($line) = @_;
2571
2572     my ($opt, $value);
2573
2574     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2575
2576     if ($line =~ m/^(enable|nosmurfs|tcpflags|ndp):\s*(0|1)\s*$/i) {
2577         $opt = lc($1);
2578         $value = int($2);
2579     } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
2580         $opt = lc($1);
2581         $value = $2 ? lc($3) : '';
2582     } elsif ($line =~ m/^(nf_conntrack_max|nf_conntrack_tcp_timeout_established):\s*(\d+)\s*$/i) {
2583         $opt = lc($1);
2584         $value = int($2);
2585     } else {
2586         die "can't parse option '$line'\n"
2587     }
2588
2589     return ($opt, $value);
2590 }
2591
2592 sub parse_clusterfw_option {
2593     my ($line) = @_;
2594
2595     my ($opt, $value);
2596
2597     if ($line =~ m/^(enable):\s*(\d+)\s*$/i) {
2598         $opt = lc($1);
2599         $value = int($2);
2600         if (($value > 1) && ((time() - $value) > 60)) {
2601             $value = 0
2602         }
2603     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2604         $opt = lc($1);
2605         $value = uc($3);
2606     } else {
2607         die "can't parse option '$line'\n"
2608     }
2609
2610     return ($opt, $value);
2611 }
2612
2613 sub resolve_alias {
2614     my ($clusterfw_conf, $fw_conf, $cidr) = @_;
2615
2616     my $alias = lc($cidr);
2617     my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2618     $e = $clusterfw_conf->{aliases}->{$alias} if !$e && $clusterfw_conf;
2619
2620     die "no such alias '$cidr'\n" if !$e;;
2621
2622     return wantarray ? ($e->{cidr}, $e->{ipversion}) : $e->{cidr};
2623 }
2624
2625 sub parse_ip_or_cidr {
2626     my ($cidr) = @_;
2627
2628     my $ipversion;
2629
2630     if ($cidr =~ m!^(?:$IPV6RE)(/(\d+))?$!) {
2631         $cidr =~ s|/128$||;
2632         $ipversion = 6;
2633     } elsif ($cidr =~ m!^(?:$IPV4RE)(/(\d+))?$!) {
2634         $cidr =~ s|/32$||;
2635         $ipversion = 4;
2636     } else {
2637         die "value does not look like a valid IP address or CIDR network\n";
2638     }
2639
2640     return wantarray ? ($cidr, $ipversion) : $cidr;
2641 }
2642
2643 sub parse_alias {
2644     my ($line) = @_;
2645
2646     # we can add single line comments to the end of the line
2647     my $comment = decode('utf8', $1) if $line =~ s/\s*#\s*(.*?)\s*$//;
2648
2649     if ($line =~ m/^(\S+)\s(\S+)$/) {
2650         my ($name, $cidr) = ($1, $2);
2651         my $ipversion;
2652
2653         ($cidr, $ipversion) = parse_ip_or_cidr($cidr);
2654
2655         my $data = {
2656             name => $name,
2657             cidr => $cidr,
2658             ipversion => $ipversion,
2659         };
2660         $data->{comment} = $comment  if $comment;
2661         return $data;
2662     }
2663
2664     return undef;
2665 }
2666
2667 sub generic_fw_config_parser {
2668     my ($filename, $fh, $verbose, $cluster_conf, $empty_conf, $rule_env) = @_;
2669
2670     my $section;
2671     my $group;
2672
2673     my $res = $empty_conf;
2674
2675     while (defined(my $line = <$fh>)) {
2676         next if $line =~ m/^#/;
2677         next if $line =~ m/^\s*$/;
2678
2679         chomp $line;
2680
2681         my $linenr = $fh->input_line_number();
2682         my $prefix = "$filename (line $linenr)";
2683
2684         if ($empty_conf->{options} && ($line =~ m/^\[options\]$/i)) {
2685             $section = 'options';
2686             next;
2687         }
2688
2689         if ($empty_conf->{aliases} && ($line =~ m/^\[aliases\]$/i)) {
2690             $section = 'aliases';
2691             next;
2692         }
2693
2694         if ($empty_conf->{groups} && ($line =~ m/^\[group\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2695             $section = 'groups';
2696             $group = lc($1);
2697             my $comment = $2;
2698             eval {
2699                 die "security group name too long\n" if length($group) > $max_group_name_length;
2700                 die "invalid security group name '$group'\n" if $group !~ m/^${security_group_name_pattern}$/;
2701             };
2702             if (my $err = $@) {
2703                 ($section, $group, $comment) = undef;
2704                 warn "$prefix: $err";
2705                 next;
2706             }
2707
2708             $res->{$section}->{$group} = [];
2709             $res->{group_comments}->{$group} =  decode('utf8', $comment)
2710                 if $comment;
2711             next;
2712         }
2713
2714         if ($empty_conf->{rules} && ($line =~ m/^\[rules\]$/i)) {
2715             $section = 'rules';
2716             next;
2717         }
2718
2719         if ($empty_conf->{ipset} && ($line =~ m/^\[ipset\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2720             $section = 'ipset';
2721             $group = lc($1);
2722             my $comment = $2;
2723             eval {
2724                 die "ipset name too long\n" if length($group) > $max_ipset_name_length;
2725                 die "invalid ipset name '$group'\n" if $group !~ m/^${ipset_name_pattern}$/;
2726             };
2727             if (my $err = $@) {
2728                 ($section, $group, $comment) = undef;
2729                 warn "$prefix: $err";
2730                 next;
2731             }
2732
2733             $res->{$section}->{$group} = [];
2734             $res->{ipset_comments}->{$group} = decode('utf8', $comment)
2735                 if $comment;
2736             next;
2737         }
2738
2739         if (!$section) {
2740             warn "$prefix: skip line - no section\n";
2741             next;
2742         }
2743
2744         if ($section eq 'options') {
2745             eval {
2746                 my ($opt, $value);
2747                 if ($rule_env eq 'cluster') {
2748                     ($opt, $value) = parse_clusterfw_option($line);
2749                 } elsif ($rule_env eq 'host') {
2750                     ($opt, $value) = parse_hostfw_option($line);
2751                 } else {
2752                     ($opt, $value) = parse_vmfw_option($line);
2753                 }
2754                 $res->{options}->{$opt} = $value;
2755             };
2756             warn "$prefix: $@" if $@;
2757         } elsif ($section eq 'aliases') {
2758             eval {
2759                 my $data = parse_alias($line);
2760                 $res->{aliases}->{lc($data->{name})} = $data;
2761             };
2762             warn "$prefix: $@" if $@;
2763         } elsif ($section eq 'rules') {
2764             my $rule;
2765             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, $res, $rule_env, $verbose); };
2766             if (my $err = $@) {
2767                 warn "$prefix: $err";
2768                 next;
2769             }
2770             push @{$res->{$section}}, $rule;
2771         } elsif ($section eq 'groups') {
2772             my $rule;
2773             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, undef, 'group', $verbose); };
2774             if (my $err = $@) {
2775                 warn "$prefix: $err";
2776                 next;
2777             }
2778             push @{$res->{$section}->{$group}}, $rule;
2779         } elsif ($section eq 'ipset') {
2780             # we can add single line comments to the end of the rule
2781             my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
2782
2783             $line =~ m/^(\!)?\s*(\S+)\s*$/;
2784             my $nomatch = $1;
2785             my $cidr = $2;
2786             my $errors;
2787
2788             if ($nomatch && !$feature_ipset_nomatch) {
2789                 $errors->{nomatch} = "nomatch not supported by kernel";
2790             }
2791
2792             eval {
2793                 if ($cidr =~ m/^${ip_alias_pattern}$/) {
2794                     resolve_alias($cluster_conf, $res, $cidr); # make sure alias exists
2795                 } else {
2796                     $cidr = parse_ip_or_cidr($cidr);
2797                 }
2798             };
2799             if (my $err = $@) {
2800                 chomp $err;
2801                 $errors->{cidr} = $err;
2802             }
2803
2804             if ($cidr =~ m!/0+$!) {
2805                 $errors->{cidr} = "a zero prefix is not allowed in ipset entries\n";
2806             }
2807
2808             my $entry = { cidr => $cidr };
2809             $entry->{nomatch} = 1 if $nomatch;
2810             $entry->{comment} = $comment if $comment;
2811             $entry->{errors} =  $errors if $errors;
2812
2813             if ($verbose && $errors) {
2814                 warn "$prefix - errors in ipset '$group': $line\n";
2815                 foreach my $p (keys %{$errors}) {
2816                     warn "  $p: $errors->{$p}\n";
2817                 }
2818             }
2819
2820             push @{$res->{$section}->{$group}}, $entry;
2821         } else {
2822             warn "$prefix: skip line - unknown section\n";
2823             next;
2824         }
2825     }
2826
2827     return $res;
2828 }
2829
2830 sub parse_hostfw_config {
2831     my ($filename, $fh, $cluster_conf, $verbose) = @_;
2832
2833     my $empty_conf = { rules => [], options => {}};
2834
2835     return generic_fw_config_parser($filename, $fh, $verbose, $cluster_conf, $empty_conf, 'host');
2836 }
2837
2838 sub parse_vmfw_config {
2839     my ($filename, $fh, $cluster_conf, $rule_env, $verbose) = @_;
2840
2841     my $empty_conf = {
2842         rules => [],
2843         options => {},
2844         aliases => {},
2845         ipset => {} ,
2846         ipset_comments => {},
2847     };
2848
2849     return generic_fw_config_parser($filename, $fh, $verbose, $cluster_conf, $empty_conf, $rule_env);
2850 }
2851
2852 sub parse_clusterfw_config {
2853     my ($filename, $fh, $verbose) = @_;
2854
2855     my $section;
2856     my $group;
2857
2858     my $empty_conf = {
2859         rules => [],
2860         options => {},
2861         aliases => {},
2862         groups => {},
2863         group_comments => {},
2864         ipset => {} ,
2865         ipset_comments => {},
2866     };
2867
2868     return generic_fw_config_parser($filename, $fh, $verbose, $empty_conf, $empty_conf, 'cluster');
2869 }
2870
2871 sub run_locked {
2872     my ($code, @param) = @_;
2873
2874     my $timeout = 10;
2875
2876     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
2877
2878     die $@ if $@;
2879
2880     return $res;
2881 }
2882
2883 sub read_local_vm_config {
2884
2885     my $qemu = {};
2886     my $lxc = {};
2887
2888     my $vmdata = { qemu => $qemu, lxc => $lxc };
2889
2890     my $vmlist = PVE::Cluster::get_vmlist();
2891     return $vmdata if !$vmlist || !$vmlist->{ids};
2892     my $ids = $vmlist->{ids};
2893
2894     foreach my $vmid (keys %$ids) {
2895         next if !$vmid; # skip VE0
2896         my $d = $ids->{$vmid};
2897         next if !$d->{node} || $d->{node} ne $nodename;
2898         next if !$d->{type};
2899         if ($d->{type} eq 'qemu') {
2900             if ($have_qemu_server) {
2901                 my $cfspath = PVE::QemuConfig->cfs_config_path($vmid);
2902                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2903                     $qemu->{$vmid} = $conf;
2904                 }
2905             }
2906         } elsif ($d->{type} eq 'lxc') {
2907             if ($have_lxc) {
2908                 my $cfspath = PVE::LXC::Config->cfs_config_path($vmid);
2909                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2910                     $lxc->{$vmid} = $conf;
2911                 }
2912             }
2913         }
2914     }
2915
2916     return $vmdata;
2917 };
2918
2919 sub load_vmfw_conf {
2920     my ($cluster_conf, $rule_env, $vmid, $dir, $verbose) = @_;
2921
2922     my $vmfw_conf = {};
2923
2924     $dir = $pvefw_conf_dir if !defined($dir);
2925
2926     my $filename = "$dir/$vmid.fw";
2927     if (my $fh = IO::File->new($filename, O_RDONLY)) {
2928         $vmfw_conf = parse_vmfw_config($filename, $fh, $cluster_conf, $rule_env, $verbose);
2929         $vmfw_conf->{vmid} = $vmid;
2930     }
2931
2932     return $vmfw_conf;
2933 }
2934
2935 my $format_rules = sub {
2936     my ($rules, $allow_iface) = @_;
2937
2938     my $raw = '';
2939
2940     foreach my $rule (@$rules) {
2941         if ($rule->{type} eq  'in' || $rule->{type} eq 'out' || $rule->{type} eq 'group') {
2942             $raw .= '|' if defined($rule->{enable}) && !$rule->{enable};
2943             $raw .= uc($rule->{type});
2944             if ($rule->{macro}) {
2945                 $raw .= " $rule->{macro}($rule->{action})";
2946             } else {
2947                 $raw .= " " . $rule->{action};
2948             }
2949             if ($allow_iface && $rule->{iface}) {
2950                 $raw .= " -i $rule->{iface}";
2951             }
2952
2953             if ($rule->{type} ne  'group')  {
2954                 $raw .= " -source $rule->{source}" if $rule->{source};
2955                 $raw .= " -dest $rule->{dest}" if $rule->{dest};
2956                 $raw .= " -p $rule->{proto}" if $rule->{proto};
2957                 $raw .= " -dport $rule->{dport}" if $rule->{dport};
2958                 $raw .= " -sport $rule->{sport}" if $rule->{sport};
2959             }
2960
2961             $raw .= " # " . encode('utf8', $rule->{comment})
2962                 if $rule->{comment} && $rule->{comment} !~ m/^\s*$/;
2963             $raw .= "\n";
2964         } else {
2965             die "unknown rule type '$rule->{type}'";
2966         }
2967     }
2968
2969     return $raw;
2970 };
2971
2972 my $format_options = sub {
2973     my ($options) = @_;
2974
2975     my $raw = '';
2976
2977     $raw .= "[OPTIONS]\n\n";
2978     foreach my $opt (keys %$options) {
2979         $raw .= "$opt: $options->{$opt}\n";
2980     }
2981     $raw .= "\n";
2982
2983     return $raw;
2984 };
2985
2986 my $format_aliases = sub {
2987     my ($aliases) = @_;
2988
2989     my $raw = '';
2990
2991     $raw .= "[ALIASES]\n\n";
2992     foreach my $k (keys %$aliases) {
2993         my $e = $aliases->{$k};
2994         $raw .= "$e->{name} $e->{cidr}";
2995         $raw .= " # " . encode('utf8', $e->{comment})
2996             if $e->{comment} && $e->{comment} !~ m/^\s*$/;
2997         $raw .= "\n";
2998     }
2999     $raw .= "\n";
3000
3001     return $raw;
3002 };
3003
3004 my $format_ipsets = sub {
3005     my ($fw_conf) = @_;
3006
3007     my $raw = '';
3008
3009     foreach my $ipset (sort keys %{$fw_conf->{ipset}}) {
3010         if (my $comment = $fw_conf->{ipset_comments}->{$ipset}) {
3011             my $utf8comment = encode('utf8', $comment);
3012             $raw .= "[IPSET $ipset] # $utf8comment\n\n";
3013         } else {
3014             $raw .= "[IPSET $ipset]\n\n";
3015         }
3016         my $options = $fw_conf->{ipset}->{$ipset};
3017
3018         my $nethash = {};
3019         foreach my $entry (@$options) {
3020             $nethash->{$entry->{cidr}} = $entry;
3021         }
3022
3023         foreach my $cidr (sort keys %$nethash) {
3024             my $entry = $nethash->{$cidr};
3025             my $line = $entry->{nomatch} ? '!' : '';
3026             $line .= $entry->{cidr};
3027             $line .= " # " . encode('utf8', $entry->{comment})
3028                 if $entry->{comment} && $entry->{comment} !~ m/^\s*$/;
3029             $raw .= "$line\n";
3030         }
3031
3032         $raw .= "\n";
3033     }
3034
3035     return $raw;
3036 };
3037
3038 sub save_vmfw_conf {
3039     my ($vmid, $vmfw_conf) = @_;
3040
3041     my $raw = '';
3042
3043     my $options = $vmfw_conf->{options};
3044     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3045
3046     my $aliases = $vmfw_conf->{aliases};
3047     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3048
3049     $raw .= &$format_ipsets($vmfw_conf) if $vmfw_conf->{ipset};
3050
3051     my $rules = $vmfw_conf->{rules} || [];
3052     if ($rules && scalar(@$rules)) {
3053         $raw .= "[RULES]\n\n";
3054         $raw .= &$format_rules($rules, 1);
3055         $raw .= "\n";
3056     }
3057
3058     my $filename = "$pvefw_conf_dir/$vmid.fw";
3059     if ($raw) {
3060         mkdir $pvefw_conf_dir;
3061         PVE::Tools::file_set_contents($filename, $raw);
3062     } else {
3063         unlink $filename;
3064     }
3065 }
3066
3067 sub remove_vmfw_conf {
3068     my ($vmid) = @_;
3069
3070     my $vmfw_conffile = "$pvefw_conf_dir/$vmid.fw";
3071
3072     unlink $vmfw_conffile;
3073 }
3074
3075 sub clone_vmfw_conf {
3076     my ($vmid, $newid) = @_;
3077
3078     my $sourcevm_conffile = "$pvefw_conf_dir/$vmid.fw";
3079     my $clonevm_conffile = "$pvefw_conf_dir/$newid.fw";
3080
3081     if (-f $clonevm_conffile) {
3082         unlink $clonevm_conffile;
3083     }
3084     if (-f $sourcevm_conffile) {
3085         my $data = PVE::Tools::file_get_contents($sourcevm_conffile);
3086         PVE::Tools::file_set_contents($clonevm_conffile, $data);
3087     }
3088 }
3089
3090 sub read_vm_firewall_configs {
3091     my ($cluster_conf, $vmdata, $dir, $verbose) = @_;
3092
3093     my $vmfw_configs = {};
3094
3095     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3096         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'vm', $vmid, $dir, $verbose);
3097         next if !$vmfw_conf->{options}; # skip if file does not exists
3098         $vmfw_configs->{$vmid} = $vmfw_conf;
3099     }
3100     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3101         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'ct', $vmid, $dir, $verbose);
3102         next if !$vmfw_conf->{options}; # skip if file does not exists
3103         $vmfw_configs->{$vmid} = $vmfw_conf;
3104     }
3105
3106     return $vmfw_configs;
3107 }
3108
3109 sub get_option_log_level {
3110     my ($options, $k) = @_;
3111
3112     my $v = $options->{$k};
3113     $v = $default_log_level if !defined($v);
3114
3115     return undef if $v eq '' || $v eq 'nolog';
3116
3117     $v = $log_level_hash->{$v} if defined($log_level_hash->{$v});
3118
3119     return $v if ($v >= 0) && ($v <= 7);
3120
3121     warn "unknown log level ($k = '$v')\n";
3122
3123     return undef;
3124 }
3125
3126 sub generate_std_chains {
3127     my ($ruleset, $options, $ipversion) = @_;
3128
3129     my $std_chains = $pve_std_chains->{$ipversion} || die "internal error";
3130
3131     my $loglevel = get_option_log_level($options, 'smurf_log_level');
3132     my $chain = 'PVEFW-smurflog';
3133     if ( $std_chains->{$chain} ) {
3134         foreach my $r (@{$std_chains->{$chain}}) {
3135           $r->{log} = $loglevel;
3136         }
3137     }
3138
3139     # same as shorewall logflags action.
3140     $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
3141     $chain = 'PVEFW-logflags';
3142     if ( $std_chains->{$chain} ) {
3143         foreach my $r (@{$std_chains->{$chain}}) {
3144           $r->{log} = $loglevel;
3145         }
3146     }
3147
3148     foreach my $chain (keys %$std_chains) {
3149         ruleset_create_chain($ruleset, $chain);
3150         foreach my $rule (@{$std_chains->{$chain}}) {
3151             if (ref($rule)) {
3152                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule);
3153             } else {
3154                 die "rule $rule as string - should not happen";
3155             }
3156         }
3157     }
3158 }
3159
3160 sub generate_ipset_chains {
3161     my ($ipset_ruleset, $clusterfw_conf, $fw_conf, $device_ips, $ipsets) = @_;
3162
3163     foreach my $ipset (keys %{$ipsets}) {
3164
3165         my $options = $ipsets->{$ipset};
3166
3167         if ($device_ips && $ipset =~ /^ipfilter-(net\d+)$/) {
3168             if (my $ips = $device_ips->{$1}) {
3169                 $options = [@$options, @$ips];
3170             }
3171         }
3172
3173         # remove duplicates
3174         my $nethash = {};
3175         foreach my $entry (@$options) {
3176             next if $entry->{errors}; # skip entries with errors
3177             eval {
3178                 my ($cidr, $ver);
3179                 if ($entry->{cidr} =~ m/^${ip_alias_pattern}$/) {
3180                     ($cidr, $ver) = resolve_alias($clusterfw_conf, $fw_conf, $entry->{cidr});
3181                 } else {
3182                     ($cidr, $ver) = parse_ip_or_cidr($entry->{cidr});
3183                 }
3184                 #http://backreference.org/2013/03/01/ipv6-address-normalization/
3185                 if ($ver == 6) {
3186                     # ip_compress_address takes an address only, no CIDR
3187                     my ($addr, $prefix_len) = ($cidr =~ m@^([^/]*)(/.*)?$@);
3188                     $cidr = lc(Net::IP::ip_compress_address($addr, 6));
3189                     $cidr .= $prefix_len if defined($prefix_len);
3190                     $cidr =~ s|/128$||;
3191                 } else {
3192                     $cidr =~ s|/32$||;
3193                 }
3194
3195                 $nethash->{$ver}->{$cidr} = { cidr => $cidr, nomatch => $entry->{nomatch} };
3196             };
3197             warn $@ if $@;
3198         }
3199
3200         foreach my $ipversion (4, 6) {
3201             my $data = $nethash->{$ipversion};
3202
3203             my $name = compute_ipset_chain_name($fw_conf->{vmid}, $ipset, $ipversion);
3204
3205             my $hashsize = scalar(@$options);
3206             if ($hashsize <= 64) {
3207                 $hashsize = 64;
3208             } else {
3209                 $hashsize = round_powerof2($hashsize);
3210             }
3211
3212             my $family = $ipversion == "6" ? "inet6" : "inet";
3213
3214             $ipset_ruleset->{$name} = ["create $name hash:net family $family hashsize $hashsize maxelem $hashsize"];
3215
3216             foreach my $cidr (sort keys %$data) {
3217                 my $entry = $data->{$cidr};
3218
3219                 my $cmd = "add $name $cidr";
3220                 if ($entry->{nomatch}) {
3221                     if ($feature_ipset_nomatch) {
3222                         push @{$ipset_ruleset->{$name}}, "$cmd nomatch";
3223                     } else {
3224                         warn "ignore !$cidr - nomatch not supported by kernel\n";
3225                     }
3226                 } else {
3227                     push @{$ipset_ruleset->{$name}}, $cmd;
3228                 }
3229             }
3230         }
3231     }
3232 }
3233
3234 sub round_powerof2 {
3235     my ($int) = @_;
3236
3237     $int--;
3238     $int |= $int >> $_ foreach (1,2,4,8,16);
3239     return ++$int;
3240 }
3241
3242 sub load_clusterfw_conf {
3243     my ($filename, $verbose) = @_;
3244
3245     $filename = $clusterfw_conf_filename if !defined($filename);
3246
3247     my $cluster_conf = {};
3248     if (my $fh = IO::File->new($filename, O_RDONLY)) {
3249         $cluster_conf = parse_clusterfw_config($filename, $fh, $verbose);
3250     }
3251
3252     return $cluster_conf;
3253 }
3254
3255 sub save_clusterfw_conf {
3256     my ($cluster_conf) = @_;
3257
3258     my $raw = '';
3259
3260     my $options = $cluster_conf->{options};
3261     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3262
3263     my $aliases = $cluster_conf->{aliases};
3264     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3265
3266     $raw .= &$format_ipsets($cluster_conf) if $cluster_conf->{ipset};
3267
3268     my $rules = $cluster_conf->{rules};
3269     if ($rules && scalar(@$rules)) {
3270         $raw .= "[RULES]\n\n";
3271         $raw .= &$format_rules($rules, 1);
3272         $raw .= "\n";
3273     }
3274
3275     if ($cluster_conf->{groups}) {
3276         foreach my $group (sort keys %{$cluster_conf->{groups}}) {
3277             my $rules = $cluster_conf->{groups}->{$group};
3278             if (my $comment = $cluster_conf->{group_comments}->{$group}) {
3279                 my $utf8comment = encode('utf8', $comment);
3280                 $raw .= "[group $group] # $utf8comment\n\n";
3281             } else {
3282                 $raw .= "[group $group]\n\n";
3283             }
3284
3285             $raw .= &$format_rules($rules, 0);
3286             $raw .= "\n";
3287         }
3288     }
3289
3290     if ($raw) {
3291         mkdir $pvefw_conf_dir;
3292         PVE::Tools::file_set_contents($clusterfw_conf_filename, $raw);
3293     } else {
3294         unlink $clusterfw_conf_filename;
3295     }
3296 }
3297
3298 sub load_hostfw_conf {
3299     my ($cluster_conf, $filename, $verbose) = @_;
3300
3301     $filename = $hostfw_conf_filename if !defined($filename);
3302
3303     my $hostfw_conf = {};
3304     if (my $fh = IO::File->new($filename, O_RDONLY)) {
3305         $hostfw_conf = parse_hostfw_config($filename, $fh, $cluster_conf, $verbose);
3306     }
3307     return $hostfw_conf;
3308 }
3309
3310 sub save_hostfw_conf {
3311     my ($hostfw_conf) = @_;
3312
3313     my $raw = '';
3314
3315     my $options = $hostfw_conf->{options};
3316     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3317
3318     my $rules = $hostfw_conf->{rules};
3319     if ($rules && scalar(@$rules)) {
3320         $raw .= "[RULES]\n\n";
3321         $raw .= &$format_rules($rules, 1);
3322         $raw .= "\n";
3323     }
3324
3325     if ($raw) {
3326         PVE::Tools::file_set_contents($hostfw_conf_filename, $raw);
3327     } else {
3328         unlink $hostfw_conf_filename;
3329     }
3330 }
3331
3332 sub compile {
3333     my ($cluster_conf, $hostfw_conf, $vmdata, $verbose) = @_;
3334
3335     my $vmfw_configs;
3336
3337     # fixme: once we read standard chains from config this needs to be put in test/standard cases below
3338     $pve_std_chains = dclone($pve_std_chains_conf);
3339
3340     if ($vmdata) { # test mode
3341         my $testdir = $vmdata->{testdir} || die "no test directory specified";
3342         my $filename = "$testdir/cluster.fw";
3343         $cluster_conf = load_clusterfw_conf($filename, $verbose);
3344
3345         $filename = "$testdir/host.fw";
3346         $hostfw_conf = load_hostfw_conf($cluster_conf, $filename, $verbose);
3347
3348         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, $testdir, $verbose);
3349     } else { # normal operation
3350         $cluster_conf = load_clusterfw_conf(undef, $verbose) if !$cluster_conf;
3351
3352         $hostfw_conf = load_hostfw_conf($cluster_conf, undef, $verbose) if !$hostfw_conf;
3353
3354         $vmdata = read_local_vm_config();
3355         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, undef, $verbose);
3356     }
3357
3358     return ({},{},{}) if !$cluster_conf->{options}->{enable};
3359
3360     my $localnet;
3361     if ($cluster_conf->{aliases}->{local_network}) {
3362         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3363     } else {
3364         my $localnet_ver;
3365         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3366
3367         $cluster_conf->{aliases}->{local_network} = {
3368             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3369     }
3370
3371     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3372
3373     my $ruleset = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 4, $verbose);
3374     my $rulesetv6 = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 6, $verbose);
3375     my $ipset_ruleset = compile_ipsets($cluster_conf, $vmfw_configs, $vmdata);
3376
3377     return ($ruleset, $ipset_ruleset, $rulesetv6);
3378 }
3379
3380 sub compile_iptables_filter {
3381     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $ipversion, $verbose) = @_;
3382
3383     my $ruleset = {};
3384
3385     ruleset_create_chain($ruleset, "PVEFW-INPUT");
3386     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
3387
3388     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3389
3390     my $hostfw_options = $hostfw_conf->{options} || {};
3391
3392     # fixme: what log level should we use here?
3393     my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
3394
3395     ruleset_chain_add_conn_filters($ruleset, "PVEFW-FORWARD", "ACCEPT");
3396
3397     ruleset_create_chain($ruleset, "PVEFW-FWBR-IN");
3398     ruleset_chain_add_input_filters($ruleset, "PVEFW-FWBR-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
3399
3400     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-in fwln+", "-j PVEFW-FWBR-IN");
3401
3402     ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3403     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-out fwln+", "-j PVEFW-FWBR-OUT");
3404
3405     generate_std_chains($ruleset, $hostfw_options, $ipversion);
3406
3407     my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
3408
3409     if ($hostfw_enable) {
3410         eval { enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf, $ipversion); };
3411         warn $@ if $@; # just to be sure - should not happen
3412     }
3413
3414     # generate firewall rules for QEMU VMs
3415     foreach my $vmid (sort keys %{$vmdata->{qemu}}) {
3416         eval {
3417             my $conf = $vmdata->{qemu}->{$vmid};
3418             my $vmfw_conf = $vmfw_configs->{$vmid};
3419             return if !$vmfw_conf;
3420
3421             foreach my $netid (sort keys %$conf) {
3422                 next if $netid !~ m/^net(\d+)$/;
3423                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3424                 next if !$net->{firewall};
3425                 my $iface = "tap${vmid}i$1";
3426
3427                 my $macaddr = $net->{macaddr};
3428                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3429                                              $vmfw_conf, $vmid, 'IN', $ipversion);
3430                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3431                                              $vmfw_conf, $vmid, 'OUT', $ipversion);
3432             }
3433         };
3434         warn $@ if $@; # just to be sure - should not happen
3435     }
3436
3437     # generate firewall rules for LXC containers
3438     foreach my $vmid (sort keys %{$vmdata->{lxc}}) {
3439         eval {
3440             my $conf = $vmdata->{lxc}->{$vmid};
3441             my $vmfw_conf = $vmfw_configs->{$vmid};
3442             return if !$vmfw_conf;
3443
3444             if ($vmfw_conf->{options}->{enable}) {
3445                 foreach my $netid (sort keys %$conf) {
3446                     next if $netid !~ m/^net(\d+)$/;
3447                     my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3448                     next if !$net->{firewall};
3449                     my $iface = "veth${vmid}i$1";
3450                     my $macaddr = $net->{hwaddr};
3451                     generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3452                                                  $vmfw_conf, $vmid, 'IN', $ipversion);
3453                     generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3454                                                  $vmfw_conf, $vmid, 'OUT', $ipversion);
3455                 }
3456             }
3457         };
3458         warn $@ if $@; # just to be sure - should not happen
3459     }
3460
3461     if(ruleset_chain_exist($ruleset, "PVEFW-IPS")){
3462         ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED", "-j PVEFW-IPS");
3463     }
3464
3465     return $ruleset;
3466 }
3467
3468 sub mac_to_linklocal {
3469     my ($macaddr) = @_;
3470     my @parts = split(/:/, $macaddr);
3471     # The standard link local address uses the fe80::/64 prefix with the
3472     # modified EUI-64 identifier derived from the MAC address by flipping the
3473     # universal/local bit and inserting FF:FE in the middle.
3474     # See RFC 4291.
3475     $parts[0] = sprintf("%02x", hex($parts[0]) ^ 0x02);
3476     my @meui64 = (@parts[0,1,2], 'ff', 'fe', @parts[3,4,5]);
3477     return "fe80::$parts[0]$parts[1]:$parts[2]FF:FE$parts[3]:$parts[4]$parts[5]";
3478 }
3479
3480 sub compile_ipsets {
3481     my ($cluster_conf, $vmfw_configs, $vmdata) = @_;
3482
3483     my $localnet;
3484     if ($cluster_conf->{aliases}->{local_network}) {
3485         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3486     } else {
3487         my $localnet_ver;
3488         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3489
3490         $cluster_conf->{aliases}->{local_network} = {
3491             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3492     }
3493
3494     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3495
3496
3497     my $ipset_ruleset = {};
3498
3499     # generate ipsets for QEMU VMs
3500     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3501         eval {
3502             my $conf = $vmdata->{qemu}->{$vmid};
3503             my $vmfw_conf = $vmfw_configs->{$vmid};
3504             return if !$vmfw_conf;
3505
3506             # When the 'ipfilter' option is enabled every device for which there
3507             # is no 'ipfilter-netX' ipset defiend gets an implicit empty default
3508             # ipset.
3509             # The reason is that ipfilter ipsets are always filled with standard
3510             # IPv6 link-local filters.
3511             my $ipsets = $vmfw_conf->{ipset};
3512             my $implicit_sets = {};
3513
3514             my $device_ips = {};
3515             foreach my $netid (keys %$conf) {
3516                 next if $netid !~ m/^net(\d+)$/;
3517                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3518                 next if !$net->{firewall};
3519
3520                 if ($vmfw_conf->{options}->{ipfilter} && !$ipsets->{"ipfilter-$netid"}) {
3521                     $implicit_sets->{"ipfilter-$netid"} = [];
3522                 }
3523
3524                 my $macaddr = $net->{macaddr};
3525                 my $linklocal = mac_to_linklocal($macaddr);
3526                 $device_ips->{$netid} = [
3527                     { cidr => $linklocal },
3528                     { cidr => 'fe80::/10', nomatch => 1 }
3529                 ];
3530             }
3531
3532             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $ipsets);
3533             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $implicit_sets);
3534         };
3535         warn $@ if $@; # just to be sure - should not happen
3536     }
3537
3538     # generate firewall rules for LXC containers
3539     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3540         eval {
3541             my $conf = $vmdata->{lxc}->{$vmid};
3542             my $vmfw_conf = $vmfw_configs->{$vmid};
3543             return if !$vmfw_conf;
3544
3545             # When the 'ipfilter' option is enabled every device for which there
3546             # is no 'ipfilter-netX' ipset defiend gets an implicit empty default
3547             # ipset.
3548             # The reason is that ipfilter ipsets are always filled with standard
3549             # IPv6 link-local filters, as well as the IP addresses configured
3550             # for the container.
3551             my $ipsets = $vmfw_conf->{ipset};
3552             my $implicit_sets = {};
3553
3554             my $device_ips = {};
3555             foreach my $netid (keys %$conf) {
3556                 next if $netid !~ m/^net(\d+)$/;
3557                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3558                 next if !$net->{firewall};
3559
3560                 if ($vmfw_conf->{options}->{ipfilter} && !$ipsets->{"ipfilter-$netid"}) {
3561                     $implicit_sets->{"ipfilter-$netid"} = [];
3562                 }
3563
3564                 my $macaddr = $net->{hwaddr};
3565                 my $linklocal = mac_to_linklocal($macaddr);
3566                 my $set = $device_ips->{$netid} = [
3567                     { cidr => $linklocal },
3568                     { cidr => 'fe80::/10', nomatch => 1 }
3569                 ];
3570                 if (defined($net->{ip}) && $net->{ip} =~ m!^($IPV4RE)(?:/\d+)?$!) {
3571                     push @$set, { cidr => $1 };
3572                 }
3573                 if (defined($net->{ip6}) && $net->{ip6} =~ m!^($IPV6RE)(?:/\d+)?$!) {
3574                     push @$set, { cidr => $1 };
3575                 }
3576             }
3577
3578             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $ipsets);
3579             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $implicit_sets);
3580         };
3581         warn $@ if $@; # just to be sure - should not happen
3582     }
3583
3584     generate_ipset_chains($ipset_ruleset, undef, $cluster_conf, undef, $cluster_conf->{ipset});
3585
3586     return $ipset_ruleset;
3587 }
3588
3589 sub get_ruleset_status {
3590     my ($ruleset, $active_chains, $digest_fn, $verbose) = @_;
3591
3592     my $statushash = {};
3593
3594     foreach my $chain (sort keys %$ruleset) {
3595         my $sig = &$digest_fn($ruleset->{$chain});
3596
3597         $statushash->{$chain}->{sig} = $sig;
3598
3599         my $oldsig = $active_chains->{$chain};
3600         if (!defined($oldsig)) {
3601             $statushash->{$chain}->{action} = 'create';
3602         } else {
3603             if ($oldsig eq $sig) {
3604                 $statushash->{$chain}->{action} = 'exists';
3605             } else {
3606                 $statushash->{$chain}->{action} = 'update';
3607             }
3608         }
3609         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
3610         foreach my $cmd (@{$ruleset->{$chain}}) {
3611             print "\t$cmd\n" if $verbose;
3612         }
3613     }
3614
3615     foreach my $chain (sort keys %$active_chains) {
3616         if (!defined($ruleset->{$chain})) {
3617             my $sig = $active_chains->{$chain};
3618             $statushash->{$chain}->{action} = 'delete';
3619             $statushash->{$chain}->{sig} = $sig;
3620             print "delete $chain ($sig)\n" if $verbose;
3621         }
3622     }
3623
3624     return $statushash;
3625 }
3626
3627 sub print_sig_rule {
3628     my ($chain, $sig) = @_;
3629
3630     # We just use this to store a SHA1 checksum used to detect changes
3631     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
3632 }
3633
3634 sub get_ruleset_cmdlist {
3635     my ($ruleset, $verbose, $iptablescmd) = @_;
3636
3637     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
3638
3639     my ($active_chains, $hooks) = iptables_get_chains($iptablescmd);
3640     my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, $verbose);
3641
3642     # create missing chains first
3643     foreach my $chain (sort keys %$ruleset) {
3644         my $stat = $statushash->{$chain};
3645         die "internal error" if !$stat;
3646         next if $stat->{action} ne 'create';
3647
3648         $cmdlist .= ":$chain - [0:0]\n";
3649     }
3650
3651     foreach my $h (qw(INPUT OUTPUT FORWARD)) {
3652         my $chain = "PVEFW-$h";
3653         if ($ruleset->{$chain} && !$hooks->{$h}) {
3654             $cmdlist .= "-A $h -j $chain\n";
3655         }
3656     }
3657
3658     foreach my $chain (sort keys %$ruleset) {
3659         my $stat = $statushash->{$chain};
3660         die "internal error" if !$stat;
3661
3662         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
3663             $cmdlist .= "-F $chain\n";
3664             foreach my $cmd (@{$ruleset->{$chain}}) {
3665                 $cmdlist .= "$cmd\n";
3666             }
3667             $cmdlist .= print_sig_rule($chain, $stat->{sig});
3668         } elsif ($stat->{action} eq 'delete') {
3669             die "internal error"; # this should not happen
3670         } elsif ($stat->{action} eq 'exists') {
3671             # do nothing
3672         } else {
3673             die "internal error - unknown status '$stat->{action}'";
3674         }
3675     }
3676
3677     foreach my $chain (keys %$statushash) {
3678         next if $statushash->{$chain}->{action} ne 'delete';
3679         $cmdlist .= "-F $chain\n";
3680     }
3681     foreach my $chain (keys %$statushash) {
3682         next if $statushash->{$chain}->{action} ne 'delete';
3683         next if $chain eq 'PVEFW-INPUT';
3684         next if $chain eq 'PVEFW-OUTPUT';
3685         next if $chain eq 'PVEFW-FORWARD';
3686         $cmdlist .= "-X $chain\n";
3687     }
3688
3689     my $changes = $cmdlist ne "*filter\n" ? 1 : 0;
3690
3691     $cmdlist .= "COMMIT\n";
3692
3693     return wantarray ? ($cmdlist, $changes) : $cmdlist;
3694 }
3695
3696 sub get_ipset_cmdlist {
3697     my ($ruleset, $verbose) = @_;
3698
3699     my $cmdlist = "";
3700
3701     my $delete_cmdlist = "";
3702
3703     my $active_chains = ipset_get_chains();
3704     my $statushash = get_ruleset_status($ruleset, $active_chains, \&ipset_chain_digest, $verbose);
3705
3706     # remove stale _swap chains
3707     foreach my $chain (keys %$active_chains) {
3708         if ($chain =~ m/^PVEFW-\S+_swap$/) {
3709             $cmdlist .= "destroy $chain\n";
3710         }
3711     }
3712
3713     foreach my $chain (keys %$ruleset) {
3714         my $stat = $statushash->{$chain};
3715         die "internal error" if !$stat;
3716
3717         if ($stat->{action} eq 'create') {
3718             foreach my $cmd (@{$ruleset->{$chain}}) {
3719                 $cmdlist .= "$cmd\n";
3720             }
3721         }
3722     }
3723
3724     foreach my $chain (keys %$ruleset) {
3725         my $stat = $statushash->{$chain};
3726         die "internal error" if !$stat;
3727
3728         if ($stat->{action} eq 'update') {
3729             my $chain_swap = $chain."_swap";
3730
3731             foreach my $cmd (@{$ruleset->{$chain}}) {
3732                 $cmd =~ s/$chain/$chain_swap/;
3733                 $cmdlist .= "$cmd\n";
3734             }
3735             $cmdlist .= "swap $chain_swap $chain\n";
3736             $cmdlist .= "flush $chain_swap\n";
3737             $cmdlist .= "destroy $chain_swap\n";
3738         }
3739     }
3740
3741      # the remove unused chains
3742     foreach my $chain (keys %$statushash) {
3743         next if $statushash->{$chain}->{action} ne 'delete';
3744
3745         $delete_cmdlist .= "flush $chain\n";
3746         $delete_cmdlist .= "destroy $chain\n";
3747     }
3748
3749     my $changes = ($cmdlist || $delete_cmdlist) ? 1 : 0;
3750
3751     return ($cmdlist, $delete_cmdlist, $changes);
3752 }
3753
3754 sub apply_ruleset {
3755     my ($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $verbose) = @_;
3756
3757     enable_bridge_firewall();
3758
3759     my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
3760         get_ipset_cmdlist($ipset_ruleset, $verbose);
3761
3762     my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset, $verbose);
3763     my ($cmdlistv6, $changesv6) = get_ruleset_cmdlist($rulesetv6, $verbose, "ip6tables");
3764
3765     if ($verbose) {
3766         if ($ipset_changes) {
3767             print "ipset changes:\n";
3768             print $ipset_create_cmdlist if $ipset_create_cmdlist;
3769             print $ipset_delete_cmdlist if $ipset_delete_cmdlist;
3770         }
3771
3772         if ($changes) {
3773             print "iptables changes:\n";
3774             print $cmdlist;
3775         }
3776
3777         if ($changesv6) {
3778             print "ip6tables changes:\n";
3779             print $cmdlistv6;
3780         }
3781     }
3782
3783     my $tmpfile = "$pve_fw_status_dir/ipsetcmdlist1";
3784     PVE::Tools::file_set_contents($tmpfile, $ipset_create_cmdlist || '');
3785
3786     ipset_restore_cmdlist($ipset_create_cmdlist);
3787
3788     $tmpfile = "$pve_fw_status_dir/ip4cmdlist";
3789     PVE::Tools::file_set_contents($tmpfile, $cmdlist || '');
3790
3791     iptables_restore_cmdlist($cmdlist);
3792
3793     $tmpfile = "$pve_fw_status_dir/ip6cmdlist";
3794     PVE::Tools::file_set_contents($tmpfile, $cmdlistv6 || '');
3795
3796     ip6tables_restore_cmdlist($cmdlistv6);
3797
3798     $tmpfile = "$pve_fw_status_dir/ipsetcmdlist2";
3799     PVE::Tools::file_set_contents($tmpfile, $ipset_delete_cmdlist || '');
3800
3801     ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
3802
3803     # test: re-read status and check if everything is up to date
3804     my $active_chains = iptables_get_chains();
3805     my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, 0);
3806
3807     my $errors;
3808     foreach my $chain (sort keys %$ruleset) {
3809         my $stat = $statushash->{$chain};
3810         if ($stat->{action} ne 'exists') {
3811             warn "unable to update chain '$chain'\n";
3812             $errors = 1;
3813         }
3814     }
3815
3816     my $active_chainsv6 = iptables_get_chains("ip6tables");
3817     my $statushashv6 = get_ruleset_status($rulesetv6, $active_chainsv6, \&iptables_chain_digest, 0);
3818
3819     foreach my $chain (sort keys %$rulesetv6) {
3820         my $stat = $statushashv6->{$chain};
3821         if ($stat->{action} ne 'exists') {
3822             warn "unable to update chain '$chain'\n";
3823             $errors = 1;
3824         }
3825     }
3826
3827     die "unable to apply firewall changes\n" if $errors;
3828
3829     update_nf_conntrack_max($hostfw_conf);
3830
3831     update_nf_conntrack_tcp_timeout_established($hostfw_conf);
3832
3833 }
3834
3835 sub update_nf_conntrack_max {
3836     my ($hostfw_conf) = @_;
3837
3838     my $max = 65536; # reasonable default
3839
3840     my $options = $hostfw_conf->{options} || {};
3841
3842     if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
3843         $max = $options->{nf_conntrack_max};
3844         $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
3845     }
3846
3847     my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
3848     my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
3849
3850     my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
3851
3852     if ($current != $max) {
3853         my $hashsize = int($max/4);
3854         PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
3855         PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
3856     }
3857 }
3858
3859 sub update_nf_conntrack_tcp_timeout_established {
3860     my ($hostfw_conf) = @_;
3861
3862     my $options = $hostfw_conf->{options} || {};
3863
3864     my $value = defined($options->{nf_conntrack_tcp_timeout_established}) ? $options->{nf_conntrack_tcp_timeout_established} : 432000;
3865
3866     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established", $value);
3867 }
3868
3869 sub remove_pvefw_chains {
3870
3871     PVE::Firewall::remove_pvefw_chains_iptables("iptables");
3872     PVE::Firewall::remove_pvefw_chains_iptables("ip6tables");
3873     PVE::Firewall::remove_pvefw_chains_ipset();
3874
3875 }
3876
3877 sub remove_pvefw_chains_iptables {
3878     my ($iptablescmd) = @_;
3879
3880     my ($chash, $hooks) = iptables_get_chains($iptablescmd);
3881     my $cmdlist = "*filter\n";
3882
3883     foreach my $h (qw(INPUT OUTPUT FORWARD)) {
3884         if ($hooks->{$h}) {
3885             $cmdlist .= "-D $h -j PVEFW-$h\n";
3886         }
3887     }
3888
3889     foreach my $chain (keys %$chash) {
3890         $cmdlist .= "-F $chain\n";
3891     }
3892
3893     foreach my $chain (keys %$chash) {
3894         $cmdlist .= "-X $chain\n";
3895     }
3896     $cmdlist .= "COMMIT\n";
3897
3898     if($iptablescmd eq "ip6tables") {
3899         ip6tables_restore_cmdlist($cmdlist);
3900     } else {
3901         iptables_restore_cmdlist($cmdlist);
3902     }
3903 }
3904
3905 sub remove_pvefw_chains_ipset {
3906
3907     my $ipset_chains = ipset_get_chains();
3908
3909     my $cmdlist = "";
3910
3911     foreach my $chain (keys %$ipset_chains) {
3912         $cmdlist .= "flush $chain\n";
3913         $cmdlist .= "destroy $chain\n";
3914     }
3915
3916     ipset_restore_cmdlist($cmdlist) if $cmdlist;
3917 }
3918
3919 sub init {
3920     my $cluster_conf = load_clusterfw_conf();
3921     my $cluster_options = $cluster_conf->{options};
3922     my $enable = $cluster_options->{enable};
3923
3924     return if !$enable;
3925
3926     # load required modules here
3927 }
3928
3929 sub update {
3930     my $code = sub {
3931
3932         my $cluster_conf = load_clusterfw_conf();
3933         my $cluster_options = $cluster_conf->{options};
3934
3935         if (!$cluster_options->{enable}) {
3936             PVE::Firewall::remove_pvefw_chains();
3937             return;
3938         }
3939
3940         my $hostfw_conf = load_hostfw_conf($cluster_conf);
3941
3942         my ($ruleset, $ipset_ruleset, $rulesetv6) = compile($cluster_conf, $hostfw_conf);
3943
3944         apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6);
3945     };
3946
3947     run_locked($code);
3948 }
3949
3950 1;