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 PVE::INotify;
   9 use PVE::Exception qw(raise raise_param_exc);
  10 use PVE::JSONSchema qw(get_standard_option);
  11 use PVE::Cluster;
  12 use PVE::ProcFSTools;
  13 use PVE::Tools qw($IPV4RE);
  14 use File::Basename;
  15 use File::Path;
  16 use IO::File;
  17 use Net::IP;
  18 use PVE::Tools qw(run_command lock_file);
  19 use Encode;
  20
  21 my $hostfw_conf_filename = "/etc/pve/local/host.fw";
  22 my $clusterfw_conf_filename = "/etc/pve/firewall/cluster.fw";
  23
  24 # dynamically include PVE::QemuServer and PVE::OpenVZ
  25 # to avoid dependency problems
  26 my $have_qemu_server;
  27 eval {
  28     require PVE::QemuServer;
  29     $have_qemu_server = 1;
  30 };
  31
  32 my $have_pve_manager;
  33 eval {
  34     require PVE::OpenVZ;
  35     $have_pve_manager = 1;
  36 };
  37
  38 PVE::JSONSchema::register_format('IPv4orCIDR', \&pve_verify_ipv4_or_cidr);
  39 sub pve_verify_ipv4_or_cidr {
  40     my ($cidr, $noerr) = @_;
  41
  42     if ($cidr =~ m!^(?:$IPV4RE)(/(\d+))?$!) {
  43         return $cidr if Net::IP->new($cidr);
  44         return undef if $noerr;
  45         die Net::IP::Error() . "\n";
  46     }
  47     return undef if $noerr;
  48     die "value does not look like a valid IP address or CIDR network\n";
  49 }
  50
  51
  52 my $feature_ipset_nomatch = 0;
  53 eval  {
  54     my (undef, undef, $release) = POSIX::uname();
  55     if ($release =~ m/^(\d+)\.(\d+)\.\d+-/) {
  56         my ($major, $minor) = ($1, $2);
  57         $feature_ipset_nomatch = 1 if ($major > 3) ||
  58             ($major == 3 && $minor >= 7);
  59     }
  60
  61 };
  62
  63 use Data::Dumper;
  64
  65 my $nodename = PVE::INotify::nodename();
  66
  67 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
  68 my $pve_fw_status_filename = "/var/lib/pve-firewall/pvefw.status";
  69
  70 my $default_log_level = 'info';
  71
  72 my $log_level_hash = {
  73     debug => 7,
  74     info => 6,
  75     notice => 5,
  76     warning => 4,
  77     err => 3,
  78     crit => 2,
  79     alert => 1,
  80     emerg => 0,
  81 };
  82
  83 # imported/converted from: /usr/share/shorewall/macro.*
  84 my $pve_fw_macros = {
  85     'Amanda' => [
  86         "Amanda Backup",
  87         { action => 'PARAM', proto => 'udp', dport => '10080' },
  88         { action => 'PARAM', proto => 'tcp', dport => '10080' },
  89     ],
  90     'Auth' => [
  91         "Auth (identd) traffic",
  92         { action => 'PARAM', proto => 'tcp', dport => '113' },
  93     ],
  94     'BGP' => [
  95         "Border Gateway Protocol traffic",
  96         { action => 'PARAM', proto => 'tcp', dport => '179' },
  97     ],
  98     'BitTorrent' => [
  99         "BitTorrent traffic for BitTorrent 3.1 and earlier",
 100         { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
 101         { action => 'PARAM', proto => 'udp', dport => '6881' },
 102     ],
 103     'BitTorrent32' => [
 104         "BitTorrent traffic for BitTorrent 3.2 and later",
 105         { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
 106         { action => 'PARAM', proto => 'udp', dport => '6881' },
 107     ],
 108     'CVS' => [
 109         "Concurrent Versions System pserver traffic",
 110         { action => 'PARAM', proto => 'tcp', dport => '2401' },
 111     ],
 112     'Citrix' => [
 113         "Citrix/ICA traffic (ICA, ICA Browser, CGP)",
 114         { action => 'PARAM', proto => 'tcp', dport => '1494' },
 115         { action => 'PARAM', proto => 'udp', dport => '1604' },
 116         { action => 'PARAM', proto => 'tcp', dport => '2598' },
 117     ],
 118     'DAAP' => [
 119         "Digital Audio Access Protocol traffic (iTunes, Rythmbox daemons)",
 120         { action => 'PARAM', proto => 'tcp', dport => '3689' },
 121         { action => 'PARAM', proto => 'udp', dport => '3689' },
 122     ],
 123     'DCC' => [
 124         "Distributed Checksum Clearinghouse spam filtering mechanism",
 125         { action => 'PARAM', proto => 'tcp', dport => '6277' },
 126     ],
 127     'DHCPfwd' => [
 128         "Forwarded DHCP traffic (bidirectional)",
 129         { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
 130         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '67:68', sport => '67:68' },
 131     ],
 132     'DNS' => [
 133         "Domain Name System traffic (upd and tcp)",
 134         { action => 'PARAM', proto => 'udp', dport => '53' },
 135         { action => 'PARAM', proto => 'tcp', dport => '53' },
 136     ],
 137     'Distcc' => [
 138         "Distributed Compiler service",
 139         { action => 'PARAM', proto => 'tcp', dport => '3632' },
 140     ],
 141     'FTP' => [
 142         "File Transfer Protocol",
 143         { action => 'PARAM', proto => 'tcp', dport => '21' },
 144     ],
 145     'Finger' => [
 146         "Finger protocol (RFC 742)",
 147         { action => 'PARAM', proto => 'tcp', dport => '79' },
 148     ],
 149     'GNUnet' => [
 150         "GNUnet secure peer-to-peer networking traffic",
 151         { action => 'PARAM', proto => 'tcp', dport => '2086' },
 152         { action => 'PARAM', proto => 'udp', dport => '2086' },
 153         { action => 'PARAM', proto => 'tcp', dport => '1080' },
 154         { action => 'PARAM', proto => 'udp', dport => '1080' },
 155     ],
 156     'GRE' => [
 157         "Generic Routing Encapsulation tunneling protocol (bidirectional)",
 158         { action => 'PARAM', proto => '47' },
 159         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '47' },
 160     ],
 161     'Git' => [
 162         "Git distributed revision control traffic",
 163         { action => 'PARAM', proto => 'tcp', dport => '9418' },
 164     ],
 165     'HKP' => [
 166         "OpenPGP HTTP keyserver protocol traffic",
 167         { action => 'PARAM', proto => 'tcp', dport => '11371' },
 168     ],
 169     'HTTP' => [
 170         "Hypertext Transfer Protocol (WWW)",
 171         { action => 'PARAM', proto => 'tcp', dport => '80' },
 172     ],
 173     'HTTPS' => [
 174         "Hypertext Transfer Protocol (WWW) over SSL",
 175         { action => 'PARAM', proto => 'tcp', dport => '443' },
 176     ],
 177     'ICPV2' => [
 178         "Internet Cache Protocol V2 (Squid) traffic",
 179         { action => 'PARAM', proto => 'udp', dport => '3130' },
 180     ],
 181     'ICQ' => [
 182         "AOL Instant Messenger traffic",
 183         { action => 'PARAM', proto => 'tcp', dport => '5190' },
 184     ],
 185     'IMAP' => [
 186         "Internet Message Access Protocol",
 187         { action => 'PARAM', proto => 'tcp', dport => '143' },
 188     ],
 189     'IMAPS' => [
 190         "Internet Message Access Protocol over SSL",
 191         { action => 'PARAM', proto => 'tcp', dport => '993' },
 192     ],
 193     'IPIP' => [
 194         "IPIP capsulation traffic (bidirectional)",
 195         { action => 'PARAM', proto => '94' },
 196         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '94' },
 197     ],
 198     'IPsec' => [
 199         "IPsec traffic (bidirectional)",
 200         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 201         { action => 'PARAM', proto => '50' },
 202         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500', sport => '500' },
 203         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '50' },
 204     ],
 205     'IPsecah' => [
 206         "IPsec authentication (AH) traffic (bidirectional)",
 207         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 208         { action => 'PARAM', proto => '51' },
 209         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500', sport => '500' },
 210         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '51' },
 211     ],
 212     'IPsecnat' => [
 213         "IPsec traffic and Nat-Traversal (bidirectional)",
 214         { action => 'PARAM', proto => 'udp', dport => '500' },
 215         { action => 'PARAM', proto => 'udp', dport => '4500' },
 216         { action => 'PARAM', proto => '50' },
 217         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500' },
 218         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '4500' },
 219         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '50' },
 220     ],
 221     'IRC' => [
 222         "Internet Relay Chat traffic",
 223         { action => 'PARAM', proto => 'tcp', dport => '6667' },
 224     ],
 225     'Jetdirect' => [
 226         "HP Jetdirect printing",
 227         { action => 'PARAM', proto => 'tcp', dport => '9100' },
 228     ],
 229     'L2TP' => [
 230         "Layer 2 Tunneling Protocol traffic",
 231         { action => 'PARAM', proto => 'udp', dport => '1701' },
 232         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '1701' },
 233     ],
 234     'LDAP' => [
 235         "Lightweight Directory Access Protocol traffic",
 236         { action => 'PARAM', proto => 'tcp', dport => '389' },
 237     ],
 238     'LDAPS' => [
 239         "Secure Lightweight Directory Access Protocol traffic",
 240         { action => 'PARAM', proto => 'tcp', dport => '636' },
 241     ],
 242     'MSNP' => [
 243         "Microsoft Notification Protocol",
 244         { action => 'PARAM', proto => 'tcp', dport => '1863' },
 245     ],
 246     'MSSQL' => [
 247         "Microsoft SQL Server",
 248         { action => 'PARAM', proto => 'tcp', dport => '1433' },
 249     ],
 250     'Mail' => [
 251         "Mail traffic (SMTP, SMTPS, Submission)",
 252         { action => 'PARAM', proto => 'tcp', dport => '25' },
 253         { action => 'PARAM', proto => 'tcp', dport => '465' },
 254         { action => 'PARAM', proto => 'tcp', dport => '587' },
 255     ],
 256     'Munin' => [
 257         "Munin networked resource monitoring traffic",
 258         { action => 'PARAM', proto => 'tcp', dport => '4949' },
 259     ],
 260     'MySQL' => [
 261         "MySQL server",
 262         { action => 'PARAM', proto => 'tcp', dport => '3306' },
 263     ],
 264     'NNTP' => [
 265         "NNTP traffic (Usenet).",
 266         { action => 'PARAM', proto => 'tcp', dport => '119' },
 267     ],
 268     'NNTPS' => [
 269         "Encrypted NNTP traffic (Usenet)",
 270         { action => 'PARAM', proto => 'tcp', dport => '563' },
 271     ],
 272     'NTP' => [
 273         "Network Time Protocol (ntpd)",
 274         { action => 'PARAM', proto => 'udp', dport => '123' },
 275     ],
 276     'NTPbi' => [
 277         "Bi-directional NTP (for NTP peers)",
 278         { action => 'PARAM', proto => 'udp', dport => '123' },
 279         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '123' },
 280     ],
 281     'OSPF' => [
 282         "OSPF multicast traffic",
 283         { action => 'PARAM', proto => '89' },
 284     ],
 285     'OpenVPN' => [
 286         "OpenVPN traffic",
 287         { action => 'PARAM', proto => 'udp', dport => '1194' },
 288     ],
 289     'PCA' => [
 290         "Symantec PCAnywere (tm)",
 291         { action => 'PARAM', proto => 'udp', dport => '5632' },
 292         { action => 'PARAM', proto => 'tcp', dport => '5631' },
 293     ],
 294     'POP3' => [
 295         "POP3 traffic",
 296         { action => 'PARAM', proto => 'tcp', dport => '110' },
 297     ],
 298     'POP3S' => [
 299         "Encrypted POP3 traffic",
 300         { action => 'PARAM', proto => 'tcp', dport => '995' },
 301     ],
 302     'PPtP' => [
 303         "Point-to-Point Tunneling Protocol",
 304         { action => 'PARAM', proto => '47' },
 305         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '47' },
 306         { action => 'PARAM', proto => 'tcp', dport => '1723' },
 307     ],
 308     'Ping' => [
 309         "ICMP echo request",
 310         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 311     ],
 312     'PostgreSQL' => [
 313         "PostgreSQL server",
 314         { action => 'PARAM', proto => 'tcp', dport => '5432' },
 315     ],
 316     'Printer' => [
 317         "Line Printer protocol printing",
 318         { action => 'PARAM', proto => 'tcp', dport => '515' },
 319     ],
 320     'RDP' => [
 321         "Microsoft Remote Desktop Protocol traffic",
 322         { action => 'PARAM', proto => 'tcp', dport => '3389' },
 323     ],
 324     'RIPbi' => [
 325         "Routing Information Protocol (bidirectional)",
 326         { action => 'PARAM', proto => 'udp', dport => '520' },
 327         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '520' },
 328     ],
 329     'RNDC' => [
 330         "BIND remote management protocol",
 331         { action => 'PARAM', proto => 'tcp', dport => '953' },
 332     ],
 333     'Razor' => [
 334         "Razor Antispam System",
 335         { action => 'ACCEPT', proto => 'tcp', dport => '2703' },
 336     ],
 337     'Rdate' => [
 338         "Remote time retrieval (rdate)",
 339         { action => 'PARAM', proto => 'tcp', dport => '37' },
 340     ],
 341     'Rsync' => [
 342         "Rsync server",
 343         { action => 'PARAM', proto => 'tcp', dport => '873' },
 344     ],
 345     'SANE' => [
 346         "SANE network scanning",
 347         { action => 'PARAM', proto => 'tcp', dport => '6566' },
 348     ],
 349     'SMB' => [
 350         "Microsoft SMB traffic",
 351         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 352         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 353         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 354         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 355     ],
 356     'SMBBI' => [
 357         "Microsoft SMB traffic (bidirectional)",
 358         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 359         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 360         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 361         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 362         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '135,445' },
 363         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '137:139' },
 364         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '1024:65535', sport => '137' },
 365         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'tcp', dport => '135,139,445' },
 366     ],
 367     'SMBswat' => [
 368         "Samba Web Administration Tool",
 369         { action => 'PARAM', proto => 'tcp', dport => '901' },
 370     ],
 371     'SMTP' => [
 372         "Simple Mail Transfer Protocol",
 373         { action => 'PARAM', proto => 'tcp', dport => '25' },
 374     ],
 375     'SMTPS' => [
 376         "Encrypted Simple Mail Transfer Protocol",
 377         { action => 'PARAM', proto => 'tcp', dport => '465' },
 378     ],
 379     'SNMP' => [
 380         "Simple Network Management Protocol",
 381         { action => 'PARAM', proto => 'udp', dport => '161:162' },
 382         { action => 'PARAM', proto => 'tcp', dport => '161' },
 383     ],
 384     'SPAMD' => [
 385         "Spam Assassin SPAMD traffic",
 386         { action => 'PARAM', proto => 'tcp', dport => '783' },
 387     ],
 388     'SSH' => [
 389         "Secure shell traffic",
 390         { action => 'PARAM', proto => 'tcp', dport => '22' },
 391     ],
 392     'SVN' => [
 393         "Subversion server (svnserve)",
 394         { action => 'PARAM', proto => 'tcp', dport => '3690' },
 395     ],
 396     'SixXS' => [
 397         "SixXS IPv6 Deployment and Tunnel Broker",
 398         { action => 'PARAM', proto => 'tcp', dport => '3874' },
 399         { action => 'PARAM', proto => 'udp', dport => '3740' },
 400         { action => 'PARAM', proto => '41' },
 401         { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
 402     ],
 403     'Squid' => [
 404         "Squid web proxy traffic",
 405         { action => 'PARAM', proto => 'tcp', dport => '3128' },
 406     ],
 407     'Submission' => [
 408         "Mail message submission traffic",
 409         { action => 'PARAM', proto => 'tcp', dport => '587' },
 410     ],
 411     'Syslog' => [
 412         "Syslog protocol (RFC 5424) traffic",
 413         { action => 'PARAM', proto => 'udp', dport => '514' },
 414         { action => 'PARAM', proto => 'tcp', dport => '514' },
 415     ],
 416     'TFTP' => [
 417         "Trivial File Transfer Protocol traffic",
 418         { action => 'PARAM', proto => 'udp', dport => '69' },
 419     ],
 420     'Telnet' => [
 421         "Telnet traffic",
 422         { action => 'PARAM', proto => 'tcp', dport => '23' },
 423     ],
 424     'Telnets' => [
 425         "Telnet over SSL",
 426         { action => 'PARAM', proto => 'tcp', dport => '992' },
 427     ],
 428     'Time' => [
 429         "RFC 868 Time protocol",
 430         { action => 'PARAM', proto => 'tcp', dport => '37' },
 431     ],
 432     'Trcrt' => [
 433         "Traceroute (for up to 30 hops) traffic",
 434         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 435         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 436     ],
 437     'VNC' => [
 438         "VNC traffic for VNC display's 0 - 9",
 439         { action => 'PARAM', proto => 'tcp', dport => '5900:5909' },
 440     ],
 441     'VNCL' => [
 442         "VNC traffic from Vncservers to Vncviewers in listen mode",
 443         { action => 'PARAM', proto => 'tcp', dport => '5500' },
 444     ],
 445     'Web' => [
 446         "WWW traffic (HTTP and HTTPS)",
 447         { action => 'PARAM', proto => 'tcp', dport => '80' },
 448         { action => 'PARAM', proto => 'tcp', dport => '443' },
 449     ],
 450     'Webcache' => [
 451         "Web Cache/Proxy traffic (port 8080)",
 452         { action => 'PARAM', proto => 'tcp', dport => '8080' },
 453     ],
 454     'Webmin' => [
 455         "Webmin traffic",
 456         { action => 'PARAM', proto => 'tcp', dport => '10000' },
 457     ],
 458     'Whois' => [
 459         "Whois (nicname, RFC 3912) traffic",
 460         { action => 'PARAM', proto => 'tcp', dport => '43' },
 461     ],
 462 };
 463
 464 my $pve_fw_parsed_macros;
 465 my $pve_fw_macro_descr;
 466 my $pve_fw_preferred_macro_names = {};
 467
 468 my $pve_std_chains = {
 469     'PVEFW-SET-ACCEPT-MARK' => [
 470         "-j MARK --set-mark 1",
 471     ],
 472     'PVEFW-DropBroadcast' => [
 473         # same as shorewall 'Broadcast'
 474         # simply DROP BROADCAST/MULTICAST/ANYCAST
 475         # we can use this to reduce logging
 476         { action => 'DROP', dsttype => 'BROADCAST' },
 477         { action => 'DROP', dsttype => 'MULTICAST' },
 478         { action => 'DROP', dsttype => 'ANYCAST' },
 479         { action => 'DROP', dest => '224.0.0.0/4' },
 480     ],
 481     'PVEFW-reject' => [
 482         # same as shorewall 'reject'
 483         { action => 'DROP', dsttype => 'BROADCAST' },
 484         { action => 'DROP', source => '224.0.0.0/4' },
 485         { action => 'DROP', proto => 'icmp' },
 486         "-p tcp -j REJECT --reject-with tcp-reset",
 487         "-p udp -j REJECT --reject-with icmp-port-unreachable",
 488         "-p icmp -j REJECT --reject-with icmp-host-unreachable",
 489         "-j REJECT --reject-with icmp-host-prohibited",
 490     ],
 491     'PVEFW-Drop' => [
 492         # same as shorewall 'Drop', which is equal to DROP,
 493         # but REJECT/DROP some packages to reduce logging,
 494         # and ACCEPT critical ICMP types
 495         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 496         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 497         { action => 'PVEFW-DropBroadcast' },
 498         # ACCEPT critical ICMP types
 499         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 500         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 501         # Drop packets with INVALID state
 502         "-m conntrack --ctstate INVALID -j DROP",
 503         # Drop Microsoft SMB noise
 504         { action => 'DROP', proto => 'udp', dport => '135,445', nbdport => 2 },
 505         { action => 'DROP', proto => 'udp', dport => '137:139'},
 506         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 507         { action => 'DROP', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
 508         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 509         # Drop new/NotSyn traffic so that it doesn't get logged
 510         "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
 511         # Drop DNS replies
 512         { action => 'DROP', proto => 'udp', sport => 53 },
 513     ],
 514     'PVEFW-Reject' => [
 515         # same as shorewall 'Reject', which is equal to Reject,
 516         # but REJECT/DROP some packages to reduce logging,
 517         # and ACCEPT critical ICMP types
 518         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 519         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 520         { action => 'PVEFW-DropBroadcast' },
 521         # ACCEPT critical ICMP types
 522         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 523         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 524         # Drop packets with INVALID state
 525         "-m conntrack --ctstate INVALID -j DROP",
 526         # Drop Microsoft SMB noise
 527         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445', nbdport => 2 },
 528         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
 529         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 530         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
 531         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 532         # Drop new/NotSyn traffic so that it doesn't get logged
 533         "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
 534         # Drop DNS replies
 535         { action => 'DROP', proto => 'udp', sport => 53 },
 536     ],
 537     'PVEFW-tcpflags' => [
 538         # same as shorewall tcpflags action.
 539         # Packets arriving on this interface are checked for som illegal combinations of TCP flags
 540         "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
 541         "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
 542         "-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
 543         "-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
 544         "-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
 545     ],
 546     'PVEFW-smurfs' => [
 547         # same as shorewall smurfs action
 548         # Filter packets for smurfs (packets with a broadcast address as the source).
 549         "-s 0.0.0.0/32 -j RETURN",
 550         "-m addrtype --src-type BROADCAST -g PVEFW-smurflog",
 551         "-s 224.0.0.0/4 -g PVEFW-smurflog",
 552     ],
 553 };
 554
 555 # iptables -p icmp -h
 556 my $icmp_type_names = {
 557     any => 1,
 558     'echo-reply' => 1,
 559     'destination-unreachable' => 1,
 560     'network-unreachable' => 1,
 561     'host-unreachable' => 1,
 562     'protocol-unreachable' => 1,
 563     'port-unreachable' => 1,
 564     'fragmentation-needed' => 1,
 565     'source-route-failed' => 1,
 566     'network-unknown' => 1,
 567     'host-unknown' => 1,
 568     'network-prohibited' => 1,
 569     'host-prohibited' => 1,
 570     'TOS-network-unreachable' => 1,
 571     'TOS-host-unreachable' => 1,
 572     'communication-prohibited' => 1,
 573     'host-precedence-violation' => 1,
 574     'precedence-cutoff' => 1,
 575     'source-quench' => 1,
 576     'redirect' => 1,
 577     'network-redirect' => 1,
 578     'host-redirect' => 1,
 579     'TOS-network-redirect' => 1,
 580     'TOS-host-redirect' => 1,
 581     'echo-request' => 1,
 582     'router-advertisement' => 1,
 583     'router-solicitation' => 1,
 584     'time-exceeded' => 1,
 585     'ttl-zero-during-transit' => 1,
 586     'ttl-zero-during-reassembly' => 1,
 587     'parameter-problem' => 1,
 588     'ip-header-bad' => 1,
 589     'required-option-missing' => 1,
 590     'timestamp-request' => 1,
 591     'timestamp-reply' => 1,
 592     'address-mask-request' => 1,
 593     'address-mask-reply' => 1,
 594 };
 595
 596 sub init_firewall_macros {
 597
 598     $pve_fw_parsed_macros = {};
 599
 600     foreach my $k (keys %$pve_fw_macros) {
 601         my $lc_name = lc($k);
 602         my $macro = $pve_fw_macros->{$k};
 603         if (!ref($macro->[0])) {
 604             $pve_fw_macro_descr->{$k} = shift @$macro;
 605         }
 606         $pve_fw_preferred_macro_names->{$lc_name} = $k;
 607         $pve_fw_parsed_macros->{$k} = $macro;
 608     }
 609 }
 610
 611 init_firewall_macros();
 612
 613 sub get_macros {
 614     return wantarray ? ($pve_fw_parsed_macros, $pve_fw_macro_descr): $pve_fw_parsed_macros;
 615 }
 616
 617 my $etc_services;
 618
 619 sub get_etc_services {
 620
 621     return $etc_services if $etc_services;
 622
 623     my $filename = "/etc/services";
 624
 625     my $fh = IO::File->new($filename, O_RDONLY);
 626     if (!$fh) {
 627         warn "unable to read '$filename' - $!\n";
 628         return {};
 629     }
 630
 631     my $services = {};
 632
 633     while (my $line = <$fh>) {
 634         chomp ($line);
 635         next if $line =~m/^#/;
 636         next if ($line =~m/^\s*$/);
 637
 638         if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp).*$!) {
 639             $services->{byid}->{$2}->{name} = $1;
 640             $services->{byid}->{$2}->{port} = $2;
 641             $services->{byid}->{$2}->{$3} = 1;
 642             $services->{byname}->{$1} = $services->{byid}->{$2};
 643         }
 644     }
 645
 646     close($fh);
 647
 648     $etc_services = $services;
 649
 650
 651     return $etc_services;
 652 }
 653
 654 my $etc_protocols;
 655
 656 sub get_etc_protocols {
 657     return $etc_protocols if $etc_protocols;
 658
 659     my $filename = "/etc/protocols";
 660
 661     my $fh = IO::File->new($filename, O_RDONLY);
 662     if (!$fh) {
 663         warn "unable to read '$filename' - $!\n";
 664         return {};
 665     }
 666
 667     my $protocols = {};
 668
 669     while (my $line = <$fh>) {
 670         chomp ($line);
 671         next if $line =~m/^#/;
 672         next if ($line =~m/^\s*$/);
 673
 674         if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
 675             $protocols->{byid}->{$2}->{name} = $1;
 676             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
 677         }
 678     }
 679
 680     close($fh);
 681
 682     $etc_protocols = $protocols;
 683
 684     return $etc_protocols;
 685 }
 686
 687 sub parse_address_list {
 688     my ($str) = @_;
 689
 690     return if $str !~ m/^(\+)(\S+)$/; # ipset ref
 691
 692     my $count = 0;
 693     my $iprange = 0;
 694     foreach my $elem (split(/,/, $str)) {
 695         $count++;
 696         if (!Net::IP->new($elem)) {
 697             my $err = Net::IP::Error();
 698             die "invalid IP address: $err\n";
 699         }
 700         $iprange = 1 if $elem =~ m/-/;
 701     }
 702
 703     die "you can use a range in a list\n" if $iprange && $count > 1;
 704 }
 705
 706 sub parse_port_name_number_or_range {
 707     my ($str) = @_;
 708
 709     my $services = PVE::Firewall::get_etc_services();
 710     my $count = 0;
 711     my $icmp_port = 0;
 712
 713     foreach my $item (split(/,/, $str)) {
 714         $count++;
 715         if ($item =~ m/^(\d+):(\d+)$/) {
 716             my ($port1, $port2) = ($1, $2);
 717             die "invalid port '$port1'\n" if $port1 > 65535;
 718             die "invalid port '$port2'\n" if $port2 > 65535;
 719         } elsif ($item =~ m/^(\d+)$/) {
 720             my $port = $1;
 721             die "invalid port '$port'\n" if $port > 65535;
 722         } else {
 723             if ($icmp_type_names->{$item}) {
 724                 $icmp_port = 1;
 725             } else {
 726                 die "invalid port '$item'\n" if !$services->{byname}->{$item};
 727             }
 728         }
 729     }
 730
 731     die "ICPM ports not allowed in port range\n" if $icmp_port && $count > 1;
 732
 733     return $count;
 734 }
 735
 736 PVE::JSONSchema::register_format('pve-fw-port-spec', \&pve_fw_verify_port_spec);
 737 sub pve_fw_verify_port_spec {
 738    my ($portstr) = @_;
 739
 740    parse_port_name_number_or_range($portstr);
 741
 742    return $portstr;
 743 }
 744
 745 PVE::JSONSchema::register_format('pve-fw-v4addr-spec', \&pve_fw_verify_v4addr_spec);
 746 sub pve_fw_verify_v4addr_spec {
 747    my ($list) = @_;
 748
 749    parse_address_list($list);
 750
 751    return $list;
 752 }
 753
 754 PVE::JSONSchema::register_format('pve-fw-protocol-spec', \&pve_fw_verify_protocol_spec);
 755 sub pve_fw_verify_protocol_spec {
 756    my ($proto) = @_;
 757
 758    my $protocols = get_etc_protocols();
 759
 760    die "unknown protocol '$proto'\n" if $proto &&
 761        !(defined($protocols->{byname}->{$proto}) ||
 762          defined($protocols->{byid}->{$proto}));
 763
 764    return $proto;
 765 }
 766
 767
 768 # helper function for API
 769
 770 my $rule_properties = {
 771     pos => {
 772         description => "Update rule at position <pos>.",
 773         type => 'integer',
 774         minimum => 0,
 775         optional => 1,
 776     },
 777     digest => {
 778         type => 'string',
 779         optional => 1,
 780         maxLength => 27,
 781         minLength => 27,
 782     },
 783     type => {
 784         type => 'string',
 785         optional => 1,
 786         enum => ['in', 'out', 'group'],
 787     },
 788     action => {
 789         type => 'string',
 790         optional => 1,
 791         enum => ['ACCEPT', 'DROP', 'REJECT'],
 792     },
 793     macro => {
 794         type => 'string',
 795         optional => 1,
 796         maxLength => 128,
 797     },
 798     iface => get_standard_option('pve-iface', { optional => 1 }),
 799     source => {
 800         type => 'string', format => 'pve-fw-v4addr-spec',
 801         optional => 1,
 802     },
 803     dest => {
 804         type => 'string', format => 'pve-fw-v4addr-spec',
 805         optional => 1,
 806     },
 807     proto => {
 808         type => 'string', format => 'pve-fw-protocol-spec',
 809         optional => 1,
 810     },
 811     enable => {
 812         type => 'boolean',
 813         optional => 1,
 814     },
 815     sport => {
 816         type => 'string', format => 'pve-fw-port-spec',
 817         optional => 1,
 818     },
 819     dport => {
 820         type => 'string', format => 'pve-fw-port-spec',
 821         optional => 1,
 822     },
 823     comment => {
 824         type => 'string',
 825         optional => 1,
 826     },
 827 };
 828
 829 sub cleanup_fw_rule {
 830     my ($rule, $digest, $pos) = @_;
 831
 832     my $r = {};
 833
 834     foreach my $k (keys %$rule) {
 835         next if !$rule_properties->{$k};
 836         my $v = $rule->{$k};
 837         next if !defined($v);
 838         $r->{$k} = $v;
 839         $r->{digest} = $digest;
 840         $r->{pos} = $pos;
 841     }
 842
 843     return $r;
 844 }
 845
 846 sub add_rule_properties {
 847     my ($properties) = @_;
 848
 849     foreach my $k (keys %$rule_properties) {
 850         my $h = $rule_properties->{$k};
 851         # copy data, so that we can modify later without side effects
 852         foreach my $opt (keys %$h) { $properties->{$k}->{$opt} = $h->{$opt}; }
 853     }
 854
 855     return $properties;
 856 }
 857
 858 sub delete_rule_properties {
 859     my ($rule, $delete_str) = @_;
 860
 861     foreach my $opt (PVE::Tools::split_list($delete_str)) {
 862         raise_param_exc({ 'delete' => "no such property ('$opt')"})
 863             if !defined($rule_properties->{$opt});
 864         raise_param_exc({ 'delete' => "unable to delete required property '$opt'"})
 865             if $opt eq 'type' || $opt eq 'action';
 866         delete $rule->{$opt};
 867     }
 868
 869     return $rule;
 870 }
 871
 872 my $apply_macro = sub {
 873     my ($macro_name, $param, $verify) = @_;
 874
 875     my $macro_rules = $pve_fw_parsed_macros->{$macro_name};
 876     die "unknown macro '$macro_name'\n" if !$macro_rules; # should not happen
 877
 878     my $rules = [];
 879
 880     foreach my $templ (@$macro_rules) {
 881         my $rule = {};
 882         my $param_used = {};
 883         foreach my $k (keys %$templ) {
 884             my $v = $templ->{$k};
 885             if ($v eq 'PARAM') {
 886                 $v = $param->{$k};
 887                 $param_used->{$k} = 1;
 888             } elsif ($v eq 'DEST') {
 889                 $v = $param->{dest};
 890                 $param_used->{dest} = 1;
 891             } elsif ($v eq 'SOURCE') {
 892                 $v = $param->{source};
 893                 $param_used->{source} = 1;
 894             }
 895
 896             if (!defined($v)) {
 897                 my $msg = "missing parameter '$k' in macro '$macro_name'";
 898                 raise_param_exc({ macro => $msg }) if $verify;
 899                 die "$msg\n";
 900             }
 901             $rule->{$k} = $v;
 902         }
 903         foreach my $k (keys %$param) {
 904             next if $k eq 'macro';
 905             next if !defined($param->{$k});
 906             next if $param_used->{$k};
 907             if (defined($rule->{$k})) {
 908                 if ($rule->{$k} ne $param->{$k}) {
 909                     my $msg = "parameter '$k' already define in macro (value = '$rule->{$k}')";
 910                     raise_param_exc({ $k => $msg }) if $verify;
 911                     die "$msg\n";
 912                 }
 913             } else {
 914                 $rule->{$k} = $param->{$k};
 915             }
 916         }
 917         push @$rules, $rule;
 918     }
 919
 920     return $rules;
 921 };
 922
 923 sub verify_rule {
 924     my ($rule, $allow_groups) = @_;
 925
 926     my $type = $rule->{type};
 927
 928     raise_param_exc({ type => "missing property"}) if !$type;
 929     raise_param_exc({ action => "missing property"}) if !$rule->{action};
 930
 931     if ($type eq  'in' || $type eq 'out') {
 932         raise_param_exc({ action => "unknown action '$rule->{action}'"})
 933             if $rule->{action} !~ m/^(ACCEPT|DROP|REJECT)$/;
 934     } elsif ($type eq 'group') {
 935         raise_param_exc({ type => "security groups not allowed"})
 936             if !$allow_groups;
 937         raise_param_exc({ action => "invalid characters in security group name"})
 938             if $rule->{action} !~ m/^[A-Za-z0-9_\-]+$/;
 939     } else {
 940         raise_param_exc({ type => "unknown rule type '$type'"});
 941     }
 942
 943     # fixme: verify $rule->{iface}?
 944
 945     if ($rule->{macro}) {
 946         my $preferred_name = $pve_fw_preferred_macro_names->{lc($rule->{macro})};
 947         raise_param_exc({ macro => "unknown macro '$rule->{macro}'"}) if !$preferred_name;
 948         $rule->{macro} = $preferred_name;
 949     }
 950
 951     if ($rule->{dport}) {
 952         eval { parse_port_name_number_or_range($rule->{dport}); };
 953         raise_param_exc({ dport => $@ }) if $@;
 954     }
 955
 956     if ($rule->{sport}) {
 957         eval { parse_port_name_number_or_range($rule->{sport}); };
 958         raise_param_exc({ sport => $@ }) if $@;
 959     }
 960
 961     if ($rule->{source}) {
 962         eval { parse_address_list($rule->{source}); };
 963         raise_param_exc({ source => $@ }) if $@;
 964     }
 965
 966     if ($rule->{dest}) {
 967         eval { parse_address_list($rule->{dest}); };
 968         raise_param_exc({ dest => $@ }) if $@;
 969     }
 970
 971     if ($rule->{macro}) {
 972         &$apply_macro($rule->{macro}, $rule, 1);
 973     }
 974
 975     return $rule;
 976 }
 977
 978 sub copy_rule_data {
 979     my ($rule, $param) = @_;
 980
 981     foreach my $k (keys %$rule_properties) {
 982         if (defined(my $v = $param->{$k})) {
 983             if ($v eq '' || $v eq '-') {
 984                 delete $rule->{$k};
 985             } else {
 986                 $rule->{$k} = $v;
 987             }
 988         } else {
 989             delete $rule->{$k};
 990         }
 991     }
 992
 993     # verify rule now
 994
 995     return $rule;
 996 }
 997
 998 # core functions
 999 my $bridge_firewall_enabled = 0;
1000
1001 sub enable_bridge_firewall {
1002
1003     return if $bridge_firewall_enabled; # only once
1004
1005     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
1006     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
1007
1008     # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
1009     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
1010
1011     $bridge_firewall_enabled = 1;
1012 }
1013
1014 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
1015
1016 sub iptables_restore_cmdlist {
1017     my ($cmdlist) = @_;
1018
1019     run_command("/sbin/iptables-restore -n", input => $cmdlist);
1020 }
1021
1022 sub ipset_restore_cmdlist {
1023     my ($cmdlist) = @_;
1024
1025     run_command("/usr/sbin/ipset restore", input => $cmdlist);
1026 }
1027
1028 sub iptables_get_chains {
1029
1030     my $res = {};
1031
1032     # check what chains we want to track
1033     my $is_pvefw_chain = sub {
1034         my $name = shift;
1035
1036         return 1 if $name =~ m/^PVEFW-\S+$/;
1037
1038         return 1 if $name =~ m/^tap\d+i\d+-(:?IN|OUT)$/;
1039
1040         return 1 if $name =~ m/^veth\d+.\d+-(:?IN|OUT)$/; # fixme: dev name is configurable
1041
1042         return 1 if $name =~ m/^venet0-\d+-(:?IN|OUT)$/;
1043
1044         return 1 if $name =~ m/^vmbr\d+-(:?FW|IN|OUT|IPS)$/;
1045         return 1 if $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/;
1046
1047         return undef;
1048     };
1049
1050     my $table = '';
1051
1052     my $hooks = {};
1053
1054     my $parser = sub {
1055         my $line = shift;
1056
1057         return if $line =~ m/^#/;
1058         return if $line =~ m/^\s*$/;
1059
1060         if ($line =~ m/^\*(\S+)$/) {
1061             $table = $1;
1062             return;
1063         }
1064
1065         return if $table ne 'filter';
1066
1067         if ($line =~ m/^:(\S+)\s/) {
1068             my $chain = $1;
1069             return if !&$is_pvefw_chain($chain);
1070             $res->{$chain} = "unknown";
1071         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
1072             my ($chain, $sig) = ($1, $2);
1073             return if !&$is_pvefw_chain($chain);
1074             $res->{$chain} = $sig;
1075         } elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD)\s+-j\s+PVEFW-\1$/) {
1076             $hooks->{$1} = 1;
1077         } else {
1078             # simply ignore the rest
1079             return;
1080         }
1081     };
1082
1083     run_command("/sbin/iptables-save", outfunc => $parser);
1084
1085     return wantarray ? ($res, $hooks) : $res;
1086 }
1087
1088 sub iptables_chain_digest {
1089     my ($rules) = @_;
1090     my $digest = Digest::SHA->new('sha1');
1091     foreach my $rule (@$rules) { # order is important
1092         $digest->add($rule);
1093     }
1094     return $digest->b64digest;
1095 }
1096
1097 sub ipset_chain_digest {
1098     my ($rules) = @_;
1099
1100     my $digest = Digest::SHA->new('sha1');
1101     foreach my $rule (sort @$rules) { # note: sorted
1102         $digest->add($rule);
1103     }
1104     return $digest->b64digest;
1105 }
1106
1107 sub ipset_get_chains {
1108
1109     my $res = {};
1110     my $chains = {};
1111
1112     my $parser = sub {
1113         my $line = shift;
1114
1115         return if $line =~ m/^#/;
1116         return if $line =~ m/^\s*$/;
1117         if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
1118             my $chain = $1;
1119             $line =~ s/\s+$//; # delete trailing white space
1120             push @{$chains->{$chain}}, $line;
1121         } else {
1122             # simply ignore the rest
1123             return;
1124         }
1125     };
1126
1127     run_command("/usr/sbin/ipset save", outfunc => $parser);
1128
1129     # compute digest for each chain
1130     foreach my $chain (keys %$chains) {
1131         $res->{$chain} = ipset_chain_digest($chains->{$chain});
1132     }
1133
1134     return $res;
1135 }
1136
1137 sub ruleset_generate_cmdstr {
1138     my ($ruleset, $chain, $rule, $actions, $goto, $cluster_conf) = @_;
1139
1140     return if defined($rule->{enable}) && !$rule->{enable};
1141
1142     die "unable to emit macro - internal error" if $rule->{macro}; # should not happen
1143
1144     my $nbdport = defined($rule->{dport}) ? parse_port_name_number_or_range($rule->{dport}) : 0;
1145     my $nbsport = defined($rule->{sport}) ? parse_port_name_number_or_range($rule->{sport}) : 0;
1146
1147     my @cmd = ();
1148
1149     push @cmd, "-i $rule->{iface_in}" if $rule->{iface_in};
1150     push @cmd, "-o $rule->{iface_out}" if $rule->{iface_out};
1151
1152     my $source = $rule->{source};
1153     my $dest = $rule->{dest};
1154
1155     if ($source) {
1156         if ($source =~ m/^(\+)(\S+)$/) {
1157             die "no such ipset $2" if !$cluster_conf->{ipset}->{$2};
1158             push @cmd, "-m set --match-set PVEFW-$2 src";
1159
1160         } elsif ($source =~ m/\-/){
1161             push @cmd, "-m iprange --src-range $source";
1162
1163         } else {
1164             push @cmd, "-s $source";
1165         }
1166     }
1167
1168     if ($dest) {
1169         if ($dest =~ m/^(\+)(\S+)$/) {
1170             die "no such ipset $2" if !$cluster_conf->{ipset}->{$2};
1171             push @cmd, "-m set --match-set PVEFW-$2 dst";
1172
1173         } elsif ($dest =~ m/^(\d+)\.(\d+).(\d+).(\d+)\-(\d+)\.(\d+).(\d+).(\d+)$/){
1174             push @cmd, "-m iprange --dst-range $dest";
1175
1176         } else {
1177             push @cmd, "-s $dest";
1178         }
1179     }
1180
1181     if ($rule->{proto}) {
1182         push @cmd, "-p $rule->{proto}";
1183
1184         my $multiport = 0;
1185         $multiport++ if $nbdport > 1;
1186         $multiport++ if $nbsport > 1;
1187
1188         push @cmd, "--match multiport" if $multiport;
1189
1190         die "multiport: option '--sports' cannot be used together with '--dports'\n"
1191             if ($multiport == 2) && ($rule->{dport} ne $rule->{sport});
1192
1193         if ($rule->{dport}) {
1194             if ($rule->{proto} && $rule->{proto} eq 'icmp') {
1195                 # Note: we use dport to store --icmp-type
1196                 die "unknown icmp-type '$rule->{dport}'\n" if !defined($icmp_type_names->{$rule->{dport}});
1197                 push @cmd, "-m icmp --icmp-type $rule->{dport}";
1198             } else {
1199                 if ($nbdport > 1) {
1200                     if ($multiport == 2) {
1201                         push @cmd,  "--ports $rule->{dport}";
1202                     } else {
1203                         push @cmd, "--dports $rule->{dport}";
1204                     }
1205                 } else {
1206                     push @cmd, "--dport $rule->{dport}";
1207                 }
1208             }
1209         }
1210
1211         if ($rule->{sport}) {
1212             if ($nbsport > 1) {
1213                 push @cmd, "--sports $rule->{sport}" if $multiport != 2;
1214             } else {
1215                 push @cmd, "--sport $rule->{sport}";
1216             }
1217         }
1218     } elsif ($rule->{dport} || $rule->{sport}) {
1219         warn "ignoring destination port '$rule->{dport}' - no protocol specified\n" if $rule->{dport};
1220         warn "ignoring source port '$rule->{sport}' - no protocol specified\n" if $rule->{sport};
1221     }
1222
1223     push @cmd, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
1224
1225     if (my $action = $rule->{action}) {
1226         $action = $actions->{$action} if defined($actions->{$action});
1227         $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
1228         push @cmd, $goto ? "-g $action" : "-j $action";
1229     }
1230
1231     return scalar(@cmd) ? join(' ', @cmd) : undef;
1232 }
1233
1234 sub ruleset_generate_rule {
1235     my ($ruleset, $chain, $rule, $actions, $goto, $cluster_conf) = @_;
1236
1237     my $rules;
1238
1239     if ($rule->{macro}) {
1240         $rules = &$apply_macro($rule->{macro}, $rule);
1241     } else {
1242         $rules = [ $rule ];
1243     }
1244
1245     foreach my $tmp (@$rules) {
1246         if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $tmp, $actions, $goto, $cluster_conf)) {
1247             ruleset_addrule($ruleset, $chain, $cmdstr);
1248         }
1249     }
1250 }
1251
1252 sub ruleset_generate_rule_insert {
1253     my ($ruleset, $chain, $rule, $actions, $goto) = @_;
1254
1255     die "implement me" if $rule->{macro}; # not implemented, because not needed so far
1256
1257     if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $rule, $actions, $goto)) {
1258         ruleset_insertrule($ruleset, $chain, $cmdstr);
1259     }
1260 }
1261
1262 sub ruleset_create_chain {
1263     my ($ruleset, $chain) = @_;
1264
1265     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
1266     die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
1267
1268     die "chain '$chain' already exists\n" if $ruleset->{$chain};
1269
1270     $ruleset->{$chain} = [];
1271 }
1272
1273 sub ruleset_chain_exist {
1274     my ($ruleset, $chain) = @_;
1275
1276     return $ruleset->{$chain} ? 1 : undef;
1277 }
1278
1279 sub ruleset_addrule {
1280    my ($ruleset, $chain, $rule) = @_;
1281
1282    die "no such chain '$chain'\n" if !$ruleset->{$chain};
1283
1284    push @{$ruleset->{$chain}}, "-A $chain $rule";
1285 }
1286
1287 sub ruleset_insertrule {
1288    my ($ruleset, $chain, $rule) = @_;
1289
1290    die "no such chain '$chain'\n" if !$ruleset->{$chain};
1291
1292    unshift @{$ruleset->{$chain}}, "-A $chain $rule";
1293 }
1294
1295 sub get_log_rule_base {
1296     my ($chain, $vmid, $msg, $loglevel) = @_;
1297
1298     die "internal error - no log level" if !defined($loglevel);
1299
1300     $vmid = 0 if !defined($vmid);
1301
1302     # Note: we use special format for prefix to pass further
1303     # info to log daemon (VMID, LOGVELEL and CHAIN)
1304
1305     return "-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
1306 }
1307
1308 sub ruleset_addlog {
1309     my ($ruleset, $chain, $vmid, $msg, $loglevel, $rule) = @_;
1310
1311     return if !defined($loglevel);
1312
1313     my $logrule = get_log_rule_base($chain, $vmid, $msg, $loglevel);
1314
1315     $logrule = "$rule $logrule" if defined($rule);
1316
1317     ruleset_addrule($ruleset, $chain, $logrule)
1318 }
1319
1320 sub generate_bridge_chains {
1321     my ($ruleset, $hostfw_conf, $bridge, $routing_table) = @_;
1322
1323     my $options = $hostfw_conf->{options} || {};
1324
1325     die "error: detected direct route to bridge '$bridge'\n"
1326         if !$options->{allow_bridge_route} && $routing_table->{$bridge};
1327
1328     if (!ruleset_chain_exist($ruleset, "$bridge-FW")) {
1329         ruleset_create_chain($ruleset, "$bridge-FW");
1330         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -m physdev --physdev-is-out -j $bridge-FW");
1331         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -m physdev --physdev-is-in -j $bridge-FW");
1332     }
1333
1334     if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) {
1335         ruleset_create_chain($ruleset, "$bridge-OUT");
1336         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-in -j $bridge-OUT");
1337         ruleset_insertrule($ruleset, "PVEFW-INPUT", "-i $bridge -m physdev --physdev-is-in -j $bridge-OUT");
1338     }
1339
1340     if (!ruleset_chain_exist($ruleset, "$bridge-IN")) {
1341         ruleset_create_chain($ruleset, "$bridge-IN");
1342         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-out -j $bridge-IN");
1343         ruleset_addrule($ruleset, "$bridge-FW", "-m mark --mark 1 -j ACCEPT");
1344         # accept traffic to unmanaged bridge ports
1345         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-out -j ACCEPT ");
1346     }
1347 }
1348
1349 sub ruleset_add_chain_policy {
1350     my ($ruleset, $chain, $vmid, $policy, $loglevel, $accept_action) = @_;
1351
1352     if ($policy eq 'ACCEPT') {
1353
1354         ruleset_generate_rule($ruleset, $chain, { action => 'ACCEPT' },
1355                               { ACCEPT =>  $accept_action});
1356
1357     } elsif ($policy eq 'DROP') {
1358
1359         ruleset_addrule($ruleset, $chain, "-j PVEFW-Drop");
1360
1361         ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
1362
1363         ruleset_addrule($ruleset, $chain, "-j DROP");
1364     } elsif ($policy eq 'REJECT') {
1365         ruleset_addrule($ruleset, $chain, "-j PVEFW-Reject");
1366
1367         ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
1368
1369         ruleset_addrule($ruleset, $chain, "-g PVEFW-reject");
1370     } else {
1371         # should not happen
1372         die "internal error: unknown policy '$policy'";
1373     }
1374 }
1375
1376 sub ruleset_create_vm_chain {
1377     my ($ruleset, $chain, $options, $macaddr, $direction) = @_;
1378
1379     ruleset_create_chain($ruleset, $chain);
1380     my $accept = generate_nfqueue($options);
1381
1382     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
1383         ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
1384     }
1385
1386     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
1387         if ($direction eq 'OUT') {
1388             ruleset_generate_rule($ruleset, $chain, { action => 'PVEFW-SET-ACCEPT-MARK',
1389                                                       proto => 'udp', sport => 68, dport => 67 });
1390         } else {
1391             ruleset_generate_rule($ruleset, $chain, { action => 'ACCEPT',
1392                                                       proto => 'udp', sport => 67, dport => 68 });
1393         }
1394     }
1395
1396     if ($options->{tcpflags}) {
1397         ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
1398     }
1399
1400     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1401     if ($direction eq 'OUT') {
1402         ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -g PVEFW-SET-ACCEPT-MARK");
1403     } else {
1404         ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j $accept");
1405     }
1406
1407     if ($direction eq 'OUT') {
1408         if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
1409             ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr -j DROP");
1410         }
1411         ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1412     }
1413 }
1414
1415 sub ruleset_generate_vm_rules {
1416     my ($ruleset, $rules, $cluster_conf, $chain, $netid, $direction, $options) = @_;
1417
1418     my $lc_direction = lc($direction);
1419
1420     foreach my $rule (@$rules) {
1421         next if $rule->{iface} && $rule->{iface} ne $netid;
1422         next if !$rule->{enable};
1423         if ($rule->{type} eq 'group') {
1424             my $group_chain = "GROUP-$rule->{action}-$direction";
1425             if(!ruleset_chain_exist($ruleset, $group_chain)){
1426                 generate_group_rules($ruleset, $cluster_conf, $rule->{action});
1427             }
1428             ruleset_addrule($ruleset, $chain, "-j $group_chain");
1429             if ($direction eq 'OUT'){
1430                 ruleset_addrule($ruleset, $chain, "-m mark --mark 1 -j RETURN");
1431             }else{
1432                 my $accept = generate_nfqueue($options);
1433                 ruleset_addrule($ruleset, $chain, "-m mark --mark 1 -j $accept");
1434             }
1435
1436         } else {
1437             next if $rule->{type} ne $lc_direction;
1438             if ($direction eq 'OUT') {
1439                 ruleset_generate_rule($ruleset, $chain, $rule,
1440                                       { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1441             } else {
1442                 my $accept = generate_nfqueue($options);
1443                 ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept , REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1444             }
1445         }
1446     }
1447 }
1448
1449 sub generate_nfqueue {
1450     my ($options) = @_;
1451
1452     my $action = "";
1453     if($options->{ips}){
1454         $action = "NFQUEUE";
1455         if($options->{ips_queues} && $options->{ips_queues} =~ m/^(\d+)(:(\d+))?$/) {
1456             if(defined($3) && defined($1)) {
1457                 $action .= " --queue-balance $1:$3";
1458             }elsif (defined($1)) {
1459                 $action .= " --queue-num $1";
1460             }
1461         }
1462         $action .= " --queue-bypass";
1463     }else{
1464         $action = "ACCEPT";
1465     }
1466
1467     return $action;
1468 }
1469
1470 sub ruleset_generate_vm_ipsrules {
1471     my ($ruleset, $options, $direction, $iface, $bridge) = @_;
1472
1473     if ($options->{ips} && $direction eq 'IN') {
1474         my $nfqueue = generate_nfqueue($options);
1475
1476         if (!ruleset_chain_exist($ruleset, "$bridge-IPS")) {
1477             ruleset_create_chain($ruleset, "PVEFW-IPS");
1478         }
1479
1480         if (!ruleset_chain_exist($ruleset, "$bridge-IPS")) {
1481             ruleset_create_chain($ruleset, "$bridge-IPS");
1482             ruleset_insertrule($ruleset, "PVEFW-IPS", "-o $bridge -m physdev --physdev-is-out -j $bridge-IPS");
1483         }
1484
1485         ruleset_addrule($ruleset, "$bridge-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged -j $nfqueue");
1486     }
1487 }
1488
1489 sub generate_venet_rules_direction {
1490     my ($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip, $direction) = @_;
1491
1492     parse_address_list($ip); # make sure we have a valid $ip list
1493
1494     my $lc_direction = lc($direction);
1495
1496     my $rules = $vmfw_conf->{rules};
1497
1498     my $options = $vmfw_conf->{options};
1499     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
1500
1501     my $chain = "venet0-$vmid-$direction";
1502
1503     ruleset_create_vm_chain($ruleset, $chain, $options, undef, $direction);
1504
1505     ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $chain, 'venet', $direction);
1506
1507     # implement policy
1508     my $policy;
1509
1510     if ($direction eq 'OUT') {
1511         $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1512     } else {
1513         $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1514     }
1515
1516     my $accept = generate_nfqueue($options);
1517     my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
1518     ruleset_add_chain_policy($ruleset, $chain, $vmid, $policy, $loglevel, $accept_action);
1519
1520     # plug into FORWARD, INPUT and OUTPUT chain
1521     if ($direction eq 'OUT') {
1522         ruleset_generate_rule_insert($ruleset, "PVEFW-FORWARD", {
1523             action => $chain,
1524             source => $ip,
1525             iface_in => 'venet0'});
1526
1527         ruleset_generate_rule_insert($ruleset, "PVEFW-INPUT", {
1528             action => $chain,
1529             source => $ip,
1530             iface_in => 'venet0'});
1531     } else {
1532         ruleset_generate_rule($ruleset, "PVEFW-FORWARD", {
1533             action => $chain,
1534             dest => $ip,
1535             iface_out => 'venet0'});
1536
1537         ruleset_generate_rule($ruleset, "PVEFW-OUTPUT", {
1538             action => $chain,
1539             dest => $ip,
1540             iface_out => 'venet0'});
1541     }
1542 }
1543
1544 sub generate_tap_rules_direction {
1545     my ($ruleset, $cluster_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $bridge, $direction) = @_;
1546
1547     my $lc_direction = lc($direction);
1548
1549     my $rules = $vmfw_conf->{rules};
1550
1551     my $options = $vmfw_conf->{options};
1552     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
1553
1554     my $tapchain = "$iface-$direction";
1555
1556     ruleset_create_vm_chain($ruleset, $tapchain, $options, $macaddr, $direction);
1557
1558     ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $tapchain, $netid, $direction, $options);
1559
1560     ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface, $bridge);
1561
1562     # implement policy
1563     my $policy;
1564
1565     if ($direction eq 'OUT') {
1566         $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1567     } else {
1568         $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1569     }
1570
1571     my $accept = generate_nfqueue($options);
1572     my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
1573     ruleset_add_chain_policy($ruleset, $tapchain, $vmid, $policy, $loglevel, $accept_action);
1574
1575     # plug the tap chain to bridge chain
1576     if ($direction eq 'IN') {
1577         ruleset_insertrule($ruleset, "$bridge-IN",
1578                            "-m physdev --physdev-is-bridged --physdev-out $iface -j $tapchain");
1579     } else {
1580         ruleset_insertrule($ruleset, "$bridge-OUT",
1581                            "-m physdev --physdev-in $iface -j $tapchain");
1582     }
1583 }
1584
1585 sub enable_host_firewall {
1586     my ($ruleset, $hostfw_conf, $cluster_conf) = @_;
1587
1588     # fixme: allow security groups
1589
1590     my $options = $hostfw_conf->{options};
1591     my $rules = $hostfw_conf->{rules};
1592
1593     # host inbound firewall
1594     my $chain = "PVEFW-HOST-IN";
1595     ruleset_create_chain($ruleset, $chain);
1596
1597     my $loglevel = get_option_log_level($options, "log_level_in");
1598
1599     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
1600         ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
1601     }
1602
1603     if ($options->{tcpflags}) {
1604         ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
1605     }
1606
1607     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1608     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
1609     ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
1610     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
1611     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW --dport 5404:5405 -j ACCEPT");
1612     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT");  #corosync
1613
1614     # we use RETURN because we need to check also tap rules
1615     my $accept_action = 'RETURN';
1616
1617     foreach my $rule (@$rules) {
1618         next if $rule->{type} ne 'in';
1619         ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1620     }
1621
1622     # implement input policy
1623     my $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1624     ruleset_add_chain_policy($ruleset, $chain, 0, $policy, $loglevel, $accept_action);
1625
1626     # host outbound firewall
1627     $chain = "PVEFW-HOST-OUT";
1628     ruleset_create_chain($ruleset, $chain);
1629
1630     $loglevel = get_option_log_level($options, "log_level_out");
1631
1632     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1633     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
1634     ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
1635     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
1636     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW --dport 5404:5405 -j ACCEPT");
1637     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
1638
1639     # we use RETURN because we may want to check other thigs later
1640     $accept_action = 'RETURN';
1641
1642     foreach my $rule (@$rules) {
1643         next if $rule->{type} ne 'out';
1644         ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1645     }
1646
1647     # implement output policy
1648     $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1649     ruleset_add_chain_policy($ruleset, $chain, 0, $policy, $loglevel, $accept_action);
1650
1651     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
1652     ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
1653 }
1654
1655 sub generate_group_rules {
1656     my ($ruleset, $cluster_conf, $group) = @_;
1657     die "no such security group '$group'\n" if !$cluster_conf->{groups}->{$group};
1658
1659     my $rules = $cluster_conf->{groups}->{$group};
1660
1661     my $chain = "GROUP-${group}-IN";
1662
1663     ruleset_create_chain($ruleset, $chain);
1664     ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1665
1666     foreach my $rule (@$rules) {
1667         next if $rule->{type} ne 'in';
1668         ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1669     }
1670
1671     $chain = "GROUP-${group}-OUT";
1672
1673     ruleset_create_chain($ruleset, $chain);
1674     ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1675
1676     foreach my $rule (@$rules) {
1677         next if $rule->{type} ne 'out';
1678         # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
1679         # check also other tap rules later
1680         ruleset_generate_rule($ruleset, $chain, $rule,
1681                               { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" }, undef, $cluster_conf);
1682     }
1683 }
1684
1685 my $MAX_NETS = 32;
1686 my $valid_netdev_names = {};
1687 for (my $i = 0; $i < $MAX_NETS; $i++)  {
1688     $valid_netdev_names->{"net$i"} = 1;
1689 }
1690
1691 sub parse_fw_rule {
1692     my ($line, $need_iface, $allow_groups) = @_;
1693
1694     my ($type, $action, $iface, $source, $dest, $proto, $dport, $sport);
1695
1696     # we can add single line comments to the end of the rule
1697     my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
1698
1699     # we can disable a rule when prefixed with '|'
1700     my $enable = 1;
1701
1702     $enable = 0 if $line =~ s/^\|//;
1703
1704     my @data = split(/\s+/, $line);
1705     my $expected_elements = $need_iface ? 8 : 7;
1706
1707     die "wrong number of rule elements\n" if scalar(@data) > $expected_elements;
1708
1709     if ($need_iface) {
1710         ($type, $action, $iface, $source, $dest, $proto, $dport, $sport) = @data
1711     } else {
1712         ($type, $action, $source, $dest, $proto, $dport, $sport) =  @data;
1713     }
1714
1715     die "incomplete rule\n" if ! ($type && $action);
1716
1717     my $macro;
1718
1719     $type = lc($type);
1720
1721     if ($type eq  'in' || $type eq 'out') {
1722         if ($action =~ m/^(ACCEPT|DROP|REJECT)$/) {
1723             # OK
1724         } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
1725             $action = $2;
1726             my $preferred_name = $pve_fw_preferred_macro_names->{lc($1)};
1727             die "unknown macro '$1'\n" if !$preferred_name;
1728             $macro = $preferred_name;
1729         } else {
1730             die "unknown action '$action'\n";
1731         }
1732     } elsif ($type eq 'group') {
1733         die "wrong number of rule elements\n" if scalar(@data) != 3;
1734         die "groups disabled\n" if !$allow_groups;
1735
1736         die "invalid characters in group name\n" if $action !~ m/^[A-Za-z0-9_\-]+$/;
1737     } else {
1738         die "unknown rule type '$type'\n";
1739     }
1740
1741     if ($need_iface) {
1742         $iface = undef if $iface && $iface eq '-';
1743     }
1744
1745     $proto = undef if $proto && $proto eq '-';
1746     pve_fw_verify_protocol_spec($proto) if $proto;
1747
1748     $source = undef if $source && $source eq '-';
1749     $dest = undef if $dest && $dest eq '-';
1750
1751     $dport = undef if $dport && $dport eq '-';
1752     $sport = undef if $sport && $sport eq '-';
1753
1754     parse_port_name_number_or_range($dport) if defined($dport);
1755     parse_port_name_number_or_range($sport) if defined($sport);
1756
1757     parse_address_list($source) if $source;
1758     parse_address_list($dest) if $dest;
1759
1760     return {
1761         type => $type,
1762         enable => $enable,
1763         comment => $comment,
1764         action => $action,
1765         macro => $macro,
1766         iface => $iface,
1767         source => $source,
1768         dest => $dest,
1769         proto => $proto,
1770         dport => $dport,
1771         sport => $sport,
1772     };
1773 }
1774
1775 sub parse_vmfw_option {
1776     my ($line) = @_;
1777
1778     my ($opt, $value);
1779
1780     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1781
1782     if ($line =~ m/^(enable|dhcp|macfilter|nosmurfs|tcpflags|ips):\s*(0|1)\s*$/i) {
1783         $opt = lc($1);
1784         $value = int($2);
1785     } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
1786         $opt = lc($1);
1787         $value = $2 ? lc($3) : '';
1788     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1789         $opt = lc($1);
1790         $value = uc($3);
1791     } elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
1792         $opt = lc($1);
1793         $value = $2;
1794     } else {
1795         chomp $line;
1796         die "can't parse option '$line'\n"
1797     }
1798
1799     return ($opt, $value);
1800 }
1801
1802 sub parse_hostfw_option {
1803     my ($line) = @_;
1804
1805     my ($opt, $value);
1806
1807     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1808
1809     if ($line =~ m/^(enable|dhcp|nosmurfs|tcpflags|allow_bridge_route|optimize):\s*(0|1)\s*$/i) {
1810         $opt = lc($1);
1811         $value = int($2);
1812     } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
1813         $opt = lc($1);
1814         $value = $2 ? lc($3) : '';
1815     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1816         $opt = lc($1);
1817         $value = uc($3);
1818     } elsif ($line =~ m/^(nf_conntrack_max):\s*(\d+)\s*$/i) {
1819         $opt = lc($1);
1820         $value = int($2);
1821     } else {
1822         chomp $line;
1823         die "can't parse option '$line'\n"
1824     }
1825
1826     return ($opt, $value);
1827 }
1828
1829 sub parse_clusterfw_option {
1830     my ($line) = @_;
1831
1832     my ($opt, $value);
1833
1834     if ($line =~ m/^(enable):\s*(0|1)\s*$/i) {
1835         $opt = lc($1);
1836         $value = int($2);
1837     } else {
1838         chomp $line;
1839         die "can't parse option '$line'\n"
1840     }
1841
1842     return ($opt, $value);
1843 }
1844
1845 sub parse_vm_fw_rules {
1846     my ($filename, $fh) = @_;
1847
1848     my $res = { rules => [], options => {}};
1849
1850     my $section;
1851
1852     my $digest = Digest::SHA->new('sha1');
1853
1854     while (defined(my $line = <$fh>)) {
1855         $digest->add($line);
1856
1857         next if $line =~ m/^#/;
1858         next if $line =~ m/^\s*$/;
1859
1860         my $linenr = $fh->input_line_number();
1861         my $prefix = "$filename (line $linenr)";
1862
1863         if ($line =~ m/^\[(\S+)\]\s*$/i) {
1864             $section = lc($1);
1865             warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1866             next;
1867         }
1868         if (!$section) {
1869             warn "$prefix: skip line - no section";
1870             next;
1871         }
1872
1873         next if !$res->{$section}; # skip undefined section
1874
1875         if ($section eq 'options') {
1876             eval {
1877                 my ($opt, $value) = parse_vmfw_option($line);
1878                 $res->{options}->{$opt} = $value;
1879             };
1880             warn "$prefix: $@" if $@;
1881             next;
1882         }
1883
1884         my $rule;
1885         eval { $rule = parse_fw_rule($line, 1, 1); };
1886         if (my $err = $@) {
1887             warn "$prefix: $err";
1888             next;
1889         }
1890
1891         push @{$res->{$section}}, $rule;
1892     }
1893
1894     $res->{digest} = $digest->b64digest;
1895
1896     return $res;
1897 }
1898
1899 sub parse_host_fw_rules {
1900     my ($filename, $fh) = @_;
1901
1902     my $res = { rules => [], options => {}};
1903
1904     my $section;
1905
1906     my $digest = Digest::SHA->new('sha1');
1907
1908     while (defined(my $line = <$fh>)) {
1909         $digest->add($line);
1910
1911         next if $line =~ m/^#/;
1912         next if $line =~ m/^\s*$/;
1913
1914         my $linenr = $fh->input_line_number();
1915         my $prefix = "$filename (line $linenr)";
1916
1917         if ($line =~ m/^\[(\S+)\]\s*$/i) {
1918             $section = lc($1);
1919             warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1920             next;
1921         }
1922         if (!$section) {
1923             warn "$prefix: skip line - no section";
1924             next;
1925         }
1926
1927         next if !$res->{$section}; # skip undefined section
1928
1929         if ($section eq 'options') {
1930             eval {
1931                 my ($opt, $value) = parse_hostfw_option($line);
1932                 $res->{options}->{$opt} = $value;
1933             };
1934             warn "$prefix: $@" if $@;
1935             next;
1936         }
1937
1938         my $rule;
1939         eval { $rule = parse_fw_rule($line, 1, 1); };
1940         if (my $err = $@) {
1941             warn "$prefix: $err";
1942             next;
1943         }
1944
1945         push @{$res->{$section}}, $rule;
1946     }
1947
1948 $res->{digest} = $digest->b64digest;
1949
1950     return $res;
1951 }
1952
1953 sub parse_cluster_fw_rules {
1954     my ($filename, $fh) = @_;
1955
1956     my $section;
1957     my $group;
1958
1959     my $res = { rules => [], options => {}, groups => {}, ipset => {} };
1960
1961     my $digest = Digest::SHA->new('sha1');
1962
1963     while (defined(my $line = <$fh>)) {
1964         $digest->add($line);
1965
1966         next if $line =~ m/^#/;
1967         next if $line =~ m/^\s*$/;
1968
1969         my $linenr = $fh->input_line_number();
1970         my $prefix = "$filename (line $linenr)";
1971
1972         if ($line =~ m/^\[options\]$/i) {
1973             $section = 'options';
1974             next;
1975         }
1976
1977         if ($line =~ m/^\[group\s+(\S+)\]\s*$/i) {
1978             $section = 'groups';
1979             $group = lc($1);
1980             next;
1981         }
1982
1983         if ($line =~ m/^\[rules\]$/i) {
1984             $section = 'rules';
1985             next;
1986         }
1987
1988         if ($line =~ m/^\[ipset\s+(\S+)\]\s*$/i) {
1989             $section = 'ipset';
1990             $group = lc($1);
1991             next;
1992         }
1993
1994         if (!$section) {
1995             warn "$prefix: skip line - no section\n";
1996             next;
1997         }
1998
1999         if ($section eq 'options') {
2000             eval {
2001                 my ($opt, $value) = parse_clusterfw_option($line);
2002                 $res->{options}->{$opt} = $value;
2003             };
2004             warn "$prefix: $@" if $@;
2005         } elsif ($section eq 'rules') {
2006             my $rule;
2007             eval { $rule = parse_fw_rule($line, 1, 1); };
2008             if (my $err = $@) {
2009                 warn "$prefix: $err";
2010                 next;
2011             }
2012             push @{$res->{$section}}, $rule;
2013         } elsif ($section eq 'groups') {
2014             my $rule;
2015             eval { $rule = parse_fw_rule($line, 0, 0); };
2016             if (my $err = $@) {
2017                 warn "$prefix: $err";
2018                 next;
2019             }
2020             push @{$res->{$section}->{$group}}, $rule;
2021         } elsif ($section eq 'ipset') {
2022             # we can add single line comments to the end of the rule
2023             my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
2024
2025             $line =~ m/^(\!)?\s*(\S+)\s*$/;
2026             my $nomatch = $1;
2027             my $cidr = $2;
2028
2029             $cidr =~ s|/32$||;
2030
2031             eval { pve_verify_ipv4_or_cidr($cidr); };
2032             if (my $err = $@) {
2033                 warn "$prefix: $cidr - $err";
2034                 next;
2035             }
2036
2037             my $entry = { cidr => $cidr };
2038             $entry->{nomatch} = 1 if $nomatch;
2039             $entry->{comment} = $comment if $comment;
2040
2041             push @{$res->{$section}->{$group}}, $entry;
2042         }
2043     }
2044
2045     $res->{digest} = $digest->b64digest;
2046     return $res;
2047 }
2048
2049 sub run_locked {
2050     my ($code, @param) = @_;
2051
2052     my $timeout = 10;
2053
2054     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
2055
2056     die $@ if $@;
2057
2058     return $res;
2059 }
2060
2061 sub read_local_vm_config {
2062
2063     my $openvz = {};
2064     my $qemu = {};
2065
2066     my $vmdata = { openvz => $openvz, qemu => $qemu };
2067
2068     my $vmlist = PVE::Cluster::get_vmlist();
2069     return $vmdata if !$vmlist || !$vmlist->{ids};
2070     my $ids = $vmlist->{ids};
2071
2072     foreach my $vmid (keys %$ids) {
2073         next if !$vmid; # skip VE0
2074         my $d = $ids->{$vmid};
2075         next if !$d->{node} || $d->{node} ne $nodename;
2076         next if !$d->{type};
2077         if ($d->{type} eq 'openvz') {
2078             if ($have_pve_manager) {
2079                 my $cfspath = PVE::OpenVZ::cfs_config_path($vmid);
2080                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2081                     $openvz->{$vmid} = $conf;
2082                 }
2083             }
2084         } elsif ($d->{type} eq 'qemu') {
2085             if ($have_qemu_server) {
2086                 my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
2087                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
2088                     $qemu->{$vmid} = $conf;
2089                 }
2090             }
2091         }
2092     }
2093
2094     return $vmdata;
2095 };
2096
2097 sub load_vmfw_conf {
2098     my ($vmid) = @_;
2099
2100     my $vmfw_conf = {};
2101
2102     my $filename = "/etc/pve/firewall/$vmid.fw";
2103     if (my $fh = IO::File->new($filename, O_RDONLY)) {
2104         $vmfw_conf = parse_vm_fw_rules($filename, $fh);
2105     }
2106
2107     return $vmfw_conf;
2108 }
2109
2110 my $format_rules = sub {
2111     my ($rules, $need_iface) = @_;
2112
2113     my $raw = '';
2114
2115     foreach my $rule (@$rules) {
2116         if ($rule->{type} eq  'in' || $rule->{type} eq 'out') {
2117             $raw .= '|' if defined($rule->{enable}) && !$rule->{enable};
2118             $raw .= uc($rule->{type});
2119             if ($rule->{macro}) {
2120                 $raw .= " $rule->{macro}($rule->{action})";
2121             } else {
2122                 $raw .= " " . $rule->{action};
2123             }
2124             $raw .= " " . ($rule->{iface} || '-') if $need_iface;
2125             $raw .= " " . ($rule->{source} || '-');
2126             $raw .= " " . ($rule->{dest} || '-');
2127             $raw .= " " . ($rule->{proto} || '-');
2128             $raw .= " " . ($rule->{dport} || '-');
2129             $raw .= " " . ($rule->{sport} || '-');
2130             $raw .= " # " . encode('utf8', $rule->{comment})
2131                 if $rule->{comment} && $rule->{comment} !~ m/^\s*$/;
2132             $raw .= "\n";
2133         } else {
2134             die "implement me '$rule->{type}'";
2135         }
2136     }
2137
2138     return $raw;
2139 };
2140
2141 my $format_options = sub {
2142     my ($options) = @_;
2143
2144     my $raw = '';
2145
2146     $raw .= "[OPTIONS]\n\n";
2147     foreach my $opt (keys %$options) {
2148         $raw .= "$opt: $options->{$opt}\n";
2149     }
2150     $raw .= "\n";
2151
2152     return $raw;
2153 };
2154
2155 my $format_ipset = sub {
2156     my ($options) = @_;
2157
2158     my $raw = '';
2159
2160     my $nethash = {};
2161     foreach my $entry (@$options) {
2162         $nethash->{$entry->{cidr}} = $entry;
2163     }
2164
2165     foreach my $cidr (sort keys %$nethash) {
2166         my $entry = $nethash->{$cidr};
2167         my $line = $entry->{nomatch} ? '!' : '';
2168         $line .= $entry->{cidr};
2169         $line .= " # " . encode('utf8', $entry->{comment})
2170             if $entry->{comment} && $entry->{comment} !~ m/^\s*$/;
2171         $raw .= "$line\n";
2172     }
2173
2174     return $raw;
2175 };
2176
2177 sub save_vmfw_conf {
2178     my ($vmid, $vmfw_conf) = @_;
2179
2180     my $raw = '';
2181
2182     my $options = $vmfw_conf->{options};
2183     $raw .= &$format_options($options) if scalar(keys %$options);
2184
2185     my $rules = $vmfw_conf->{rules};
2186     if (scalar(@$rules)) {
2187         $raw .= "[RULES]\n\n";
2188         $raw .= &$format_rules($rules, 1);
2189         $raw .= "\n";
2190     }
2191
2192     my $filename = "/etc/pve/firewall/$vmid.fw";
2193     PVE::Tools::file_set_contents($filename, $raw);
2194 }
2195
2196 sub read_vm_firewall_configs {
2197     my ($vmdata) = @_;
2198     my $vmfw_configs = {};
2199
2200     foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
2201         my $vmfw_conf = load_vmfw_conf($vmid);
2202         next if !$vmfw_conf->{options}; # skip if file does not exists
2203         $vmfw_configs->{$vmid} = $vmfw_conf;
2204     }
2205
2206     return $vmfw_configs;
2207 }
2208
2209 sub get_option_log_level {
2210     my ($options, $k) = @_;
2211
2212     my $v = $options->{$k};
2213     $v = $default_log_level if !defined($v);
2214
2215     return undef if $v eq '' || $v eq 'nolog';
2216
2217     $v = $log_level_hash->{$v} if defined($log_level_hash->{$v});
2218
2219     return $v if ($v >= 0) && ($v <= 7);
2220
2221     warn "unknown log level ($k = '$v')\n";
2222
2223     return undef;
2224 }
2225
2226 sub generate_std_chains {
2227     my ($ruleset, $options) = @_;
2228
2229     my $loglevel = get_option_log_level($options, 'smurf_log_level');
2230
2231     # same as shorewall smurflog.
2232     my $chain = 'PVEFW-smurflog';
2233
2234     push @{$pve_std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
2235     push @{$pve_std_chains->{$chain}}, "-j DROP";
2236
2237     # same as shorewall logflags action.
2238     $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
2239     $chain = 'PVEFW-logflags';
2240     # fixme: is this correctly logged by pvewf-logger? (ther is no --log-ip-options for NFLOG)
2241     push @{$pve_std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
2242     push @{$pve_std_chains->{$chain}}, "-j DROP";
2243
2244     foreach my $chain (keys %$pve_std_chains) {
2245         ruleset_create_chain($ruleset, $chain);
2246         foreach my $rule (@{$pve_std_chains->{$chain}}) {
2247             if (ref($rule)) {
2248                 ruleset_generate_rule($ruleset, $chain, $rule);
2249             } else {
2250                 ruleset_addrule($ruleset, $chain, $rule);
2251             }
2252         }
2253     }
2254 }
2255
2256 sub generate_ipset_chains {
2257     my ($ipset_ruleset, $fw_conf) = @_;
2258
2259     foreach my $ipset (keys %{$fw_conf->{ipset}}) {
2260         generate_ipset($ipset_ruleset, "PVEFW-$ipset", $fw_conf->{ipset}->{$ipset});
2261     }
2262 }
2263
2264 sub generate_ipset {
2265     my ($ipset_ruleset, $name, $options) = @_;
2266
2267     my $hashsize = scalar(@$options);
2268     if ($hashsize <= 64) {
2269         $hashsize = 64;
2270     } else {
2271         $hashsize = round_powerof2($hashsize);
2272     }
2273
2274     push @{$ipset_ruleset->{$name}}, "create $name hash:net family inet hashsize $hashsize maxelem $hashsize";
2275
2276     # remove duplicates
2277     my $nethash = {};
2278     foreach my $entry (@$options) {
2279         $nethash->{$entry->{cidr}} = $entry;
2280     }
2281
2282     foreach my $cidr (sort keys %$nethash) {
2283         my $entry = $nethash->{$cidr};
2284
2285         my $cmd = "add $name $cidr";
2286         if ($entry->{nomatch}) {
2287             if ($feature_ipset_nomatch) {
2288                 push @{$ipset_ruleset->{$name}}, "$cmd nomatch";
2289             } else {
2290                 warn "ignore !$cidr - nomatch not supported by kernel\n";
2291             }
2292         } else {
2293             push @{$ipset_ruleset->{$name}}, $cmd;
2294         }
2295     }
2296 }
2297
2298 sub round_powerof2 {
2299     my ($int) = @_;
2300
2301     $int--;
2302     $int |= $int >> $_ foreach (1,2,4,8,16);
2303     return ++$int;
2304 }
2305
2306 sub save_pvefw_status {
2307     my ($status) = @_;
2308
2309     die "unknown status '$status' - internal error"
2310         if $status !~ m/^(stopped|active)$/;
2311
2312     mkdir dirname($pve_fw_status_filename);
2313     PVE::Tools::file_set_contents($pve_fw_status_filename, $status);
2314 }
2315
2316 sub read_pvefw_status {
2317
2318     my $status = 'unknown';
2319
2320     return 'stopped' if ! -f $pve_fw_status_filename;
2321
2322     eval {
2323         $status = PVE::Tools::file_get_contents($pve_fw_status_filename);
2324     };
2325     warn $@ if $@;
2326
2327     return $status;
2328 }
2329
2330 # fixme: move to pve-common PVE::ProcFSTools
2331 sub read_proc_net_route {
2332     my $filename = "/proc/net/route";
2333
2334     my $res = {};
2335
2336     my $fh = IO::File->new ($filename, "r");
2337     return $res if !$fh;
2338
2339     my $int_to_quad = sub {
2340         return join '.' => map { ($_[0] >> 8*(3-$_)) % 256 } (3, 2, 1, 0);
2341     };
2342
2343     while (defined(my $line = <$fh>)) {
2344         next if $line =~/^Iface\s+Destination/; # skip head
2345         my ($iface, $dest, $gateway, $metric, $mask, $mtu) = (split(/\s+/, $line))[0,1,2,6,7,8];
2346         push @{$res->{$iface}}, {
2347             dest => &$int_to_quad(hex($dest)),
2348             gateway => &$int_to_quad(hex($gateway)),
2349             mask => &$int_to_quad(hex($mask)),
2350             metric => $metric,
2351             mtu => $mtu,
2352         };
2353     }
2354
2355     return $res;
2356 }
2357
2358 sub load_clusterfw_conf {
2359
2360     my $cluster_conf = {};
2361      if (my $fh = IO::File->new($clusterfw_conf_filename, O_RDONLY)) {
2362         $cluster_conf = parse_cluster_fw_rules($clusterfw_conf_filename, $fh);
2363     }
2364
2365     return $cluster_conf;
2366 }
2367
2368 sub save_clusterfw_conf {
2369     my ($cluster_conf) = @_;
2370
2371     my $raw = '';
2372
2373     my $options = $cluster_conf->{options};
2374     $raw .= &$format_options($options) if scalar(keys %$options);
2375
2376     foreach my $ipset (sort keys %{$cluster_conf->{ipset}}) {
2377         $raw .= "[IPSET $ipset]\n\n";
2378         my $options = $cluster_conf->{ipset}->{$ipset};
2379         $raw .= &$format_ipset($options);
2380         $raw .= "\n";
2381     }
2382
2383     my $rules = $cluster_conf->{rules};
2384     if (scalar(@$rules)) {
2385         $raw .= "[RULES]\n\n";
2386         $raw .= &$format_rules($rules, 1);
2387         $raw .= "\n";
2388     }
2389
2390     foreach my $group (sort keys %{$cluster_conf->{groups}}) {
2391         my $rules = $cluster_conf->{groups}->{$group};
2392         $raw .= "[group $group]\n\n";
2393         $raw .= &$format_rules($rules, 0);
2394         $raw .= "\n";
2395     }
2396
2397     PVE::Tools::file_set_contents($clusterfw_conf_filename, $raw);
2398 }
2399
2400 sub load_hostfw_conf {
2401
2402     my $hostfw_conf = {};
2403     if (my $fh = IO::File->new($hostfw_conf_filename, O_RDONLY)) {
2404         $hostfw_conf = parse_host_fw_rules($hostfw_conf_filename, $fh);
2405     }
2406     return $hostfw_conf;
2407 }
2408
2409 sub save_hostfw_conf {
2410     my ($hostfw_conf) = @_;
2411
2412     my $raw = '';
2413
2414     my $options = $hostfw_conf->{options};
2415     $raw .= &$format_options($options) if scalar(keys %$options);
2416
2417     my $rules = $hostfw_conf->{rules};
2418     if (scalar(@$rules)) {
2419         $raw .= "[RULES]\n\n";
2420         $raw .= &$format_rules($rules, 1);
2421         $raw .= "\n";
2422     }
2423
2424     PVE::Tools::file_set_contents($hostfw_conf_filename, $raw);
2425 }
2426
2427 sub compile {
2428     my $vmdata = read_local_vm_config();
2429     my $vmfw_configs = read_vm_firewall_configs($vmdata);
2430
2431     my $routing_table = read_proc_net_route();
2432
2433     my $cluster_conf = load_clusterfw_conf();
2434
2435     my $ipset_ruleset = {};
2436     generate_ipset_chains($ipset_ruleset, $cluster_conf);
2437
2438     my $ruleset = {};
2439
2440     ruleset_create_chain($ruleset, "PVEFW-INPUT");
2441     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
2442
2443     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
2444
2445     my $hostfw_conf = load_hostfw_conf();
2446     my $hostfw_options = $hostfw_conf->{options} || {};
2447
2448     generate_std_chains($ruleset, $hostfw_options);
2449
2450     my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
2451
2452     enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf) if $hostfw_enable;
2453
2454     # generate firewall rules for QEMU VMs
2455     foreach my $vmid (keys %{$vmdata->{qemu}}) {
2456         my $conf = $vmdata->{qemu}->{$vmid};
2457         my $vmfw_conf = $vmfw_configs->{$vmid};
2458         next if !$vmfw_conf;
2459         next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
2460
2461         foreach my $netid (keys %$conf) {
2462             next if $netid !~ m/^net(\d+)$/;
2463             my $net = PVE::QemuServer::parse_net($conf->{$netid});
2464             next if !$net;
2465             my $iface = "tap${vmid}i$1";
2466
2467             my $bridge = $net->{bridge};
2468             next if !$bridge; # fixme: ?
2469
2470             $bridge .= "v$net->{tag}" if $net->{tag};
2471
2472             generate_bridge_chains($ruleset, $hostfw_conf, $bridge, $routing_table);
2473
2474             my $macaddr = $net->{macaddr};
2475             generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
2476                                          $vmfw_conf, $vmid, $bridge, 'IN');
2477             generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
2478                                          $vmfw_conf, $vmid, $bridge, 'OUT');
2479         }
2480     }
2481
2482     # generate firewall rules for OpenVZ containers
2483     foreach my $vmid (keys %{$vmdata->{openvz}}) {
2484         my $conf = $vmdata->{openvz}->{$vmid};
2485
2486         my $vmfw_conf = $vmfw_configs->{$vmid};
2487         next if !$vmfw_conf;
2488         next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
2489
2490         if ($conf->{ip_address} && $conf->{ip_address}->{value}) {
2491             my $ip = $conf->{ip_address}->{value};
2492             generate_venet_rules_direction($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip, 'IN');
2493             generate_venet_rules_direction($ruleset, $cluster_conf, $vmfw_conf, $vmid, $ip, 'OUT');
2494         }
2495
2496         if ($conf->{netif} && $conf->{netif}->{value}) {
2497             my $netif = PVE::OpenVZ::parse_netif($conf->{netif}->{value});
2498             foreach my $netid (keys %$netif) {
2499                 my $d = $netif->{$netid};
2500                 my $bridge = $d->{bridge};
2501                 if (!$bridge) {
2502                     warn "no bridge device for CT $vmid iface '$netid'\n";
2503                     next; # fixme?
2504                 }
2505
2506                 generate_bridge_chains($ruleset, $hostfw_conf, $bridge, $routing_table);
2507
2508                 my $macaddr = $d->{mac};
2509                 my $iface = $d->{host_ifname};
2510                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
2511                                              $vmfw_conf, $vmid, $bridge, 'IN');
2512                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
2513                                              $vmfw_conf, $vmid, $bridge, 'OUT');
2514             }
2515         }
2516     }
2517
2518     if($hostfw_options->{optimize}){
2519
2520         my $accept = ruleset_chain_exist($ruleset, "PVEFW-IPS") ? "PVEFW-IPS" : "ACCEPT";
2521         ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j $accept");
2522         ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate INVALID -j DROP");
2523     }
2524
2525     # fixme: what log level should we use here?
2526     my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
2527
2528     # fixme: should we really block inter-bridge traffic?
2529
2530     # always allow traffic from containers?
2531     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i venet0 -j RETURN");
2532
2533     # disable interbridge routing
2534     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o vmbr+ -j PVEFW-Drop");
2535     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i vmbr+ -j PVEFW-Drop");
2536     ruleset_addlog($ruleset, "PVEFW-FORWARD", 0, "DROP: ", $loglevel, "-o vmbr+");
2537     ruleset_addlog($ruleset, "PVEFW-FORWARD", 0, "DROP: ", $loglevel, "-i vmbr+");
2538     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o vmbr+ -j DROP");
2539     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i vmbr+ -j DROP");
2540
2541     return wantarray ? ($ruleset, $hostfw_conf, $ipset_ruleset) : $ruleset;
2542 }
2543
2544 sub get_ruleset_status {
2545     my ($ruleset, $active_chains, $digest_fn, $verbose) = @_;
2546
2547     my $statushash = {};
2548
2549     foreach my $chain (sort keys %$ruleset) {
2550         my $sig = &$digest_fn($ruleset->{$chain});
2551
2552         $statushash->{$chain}->{sig} = $sig;
2553
2554         my $oldsig = $active_chains->{$chain};
2555         if (!defined($oldsig)) {
2556             $statushash->{$chain}->{action} = 'create';
2557         } else {
2558             if ($oldsig eq $sig) {
2559                 $statushash->{$chain}->{action} = 'exists';
2560             } else {
2561                 $statushash->{$chain}->{action} = 'update';
2562             }
2563         }
2564         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
2565         foreach my $cmd (@{$ruleset->{$chain}}) {
2566             print "\t$cmd\n" if $verbose;
2567         }
2568     }
2569
2570     foreach my $chain (sort keys %$active_chains) {
2571         if (!defined($ruleset->{$chain})) {
2572             my $sig = $active_chains->{$chain};
2573             $statushash->{$chain}->{action} = 'delete';
2574             $statushash->{$chain}->{sig} = $sig;
2575             print "delete $chain ($sig)\n" if $verbose;
2576         }
2577     }
2578
2579     return $statushash;
2580 }
2581
2582 sub print_sig_rule {
2583     my ($chain, $sig) = @_;
2584
2585     # We just use this to store a SHA1 checksum used to detect changes
2586     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
2587 }
2588
2589 sub get_ruleset_cmdlist {
2590     my ($ruleset, $verbose) = @_;
2591
2592     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
2593
2594     my ($active_chains, $hooks) = iptables_get_chains();
2595     my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, $verbose);
2596
2597     # create missing chains first
2598     foreach my $chain (sort keys %$ruleset) {
2599         my $stat = $statushash->{$chain};
2600         die "internal error" if !$stat;
2601         next if $stat->{action} ne 'create';
2602
2603         $cmdlist .= ":$chain - [0:0]\n";
2604     }
2605
2606     foreach my $h (qw(INPUT OUTPUT FORWARD)) {
2607         if (!$hooks->{$h}) {
2608             $cmdlist .= "-A $h -j PVEFW-$h\n";
2609         }
2610     }
2611
2612     foreach my $chain (sort keys %$ruleset) {
2613         my $stat = $statushash->{$chain};
2614         die "internal error" if !$stat;
2615
2616         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
2617             $cmdlist .= "-F $chain\n";
2618             foreach my $cmd (@{$ruleset->{$chain}}) {
2619                 $cmdlist .= "$cmd\n";
2620             }
2621             $cmdlist .= print_sig_rule($chain, $stat->{sig});
2622         } elsif ($stat->{action} eq 'delete') {
2623             die "internal error"; # this should not happen
2624         } elsif ($stat->{action} eq 'exists') {
2625             # do nothing
2626         } else {
2627             die "internal error - unknown status '$stat->{action}'";
2628         }
2629     }
2630
2631     foreach my $chain (keys %$statushash) {
2632         next if $statushash->{$chain}->{action} ne 'delete';
2633         $cmdlist .= "-F $chain\n";
2634     }
2635     foreach my $chain (keys %$statushash) {
2636         next if $statushash->{$chain}->{action} ne 'delete';
2637         next if $chain eq 'PVEFW-INPUT';
2638         next if $chain eq 'PVEFW-OUTPUT';
2639         next if $chain eq 'PVEFW-FORWARD';
2640         $cmdlist .= "-X $chain\n";
2641     }
2642
2643     my $changes = $cmdlist ne "*filter\n" ? 1 : 0;
2644
2645     $cmdlist .= "COMMIT\n";
2646
2647     return wantarray ? ($cmdlist, $changes) : $cmdlist;
2648 }
2649
2650 sub get_ipset_cmdlist {
2651     my ($ruleset, $verbose) = @_;
2652
2653     my $cmdlist = "";
2654
2655     my $delete_cmdlist = "";
2656
2657     my $active_chains = ipset_get_chains();
2658     my $statushash = get_ruleset_status($ruleset, $active_chains, \&ipset_chain_digest, $verbose);
2659
2660     # remove stale _swap chains
2661     foreach my $chain (keys %$active_chains) {
2662         if ($chain =~ m/^PVEFW-\S+_swap$/) {
2663             $cmdlist .= "destroy $chain\n";
2664         }
2665     }
2666
2667     foreach my $chain (sort keys %$ruleset) {
2668         my $stat = $statushash->{$chain};
2669         die "internal error" if !$stat;
2670
2671         if ($stat->{action} eq 'create') {
2672             foreach my $cmd (@{$ruleset->{$chain}}) {
2673                 $cmdlist .= "$cmd\n";
2674             }
2675         }
2676
2677         if ($stat->{action} eq 'update') {
2678             my $chain_swap = $chain."_swap";
2679
2680             foreach my $cmd (@{$ruleset->{$chain}}) {
2681                 $cmd =~ s/$chain/$chain_swap/;
2682                 $cmdlist .= "$cmd\n";
2683             }
2684             $cmdlist .= "swap $chain_swap $chain\n";
2685             $cmdlist .= "flush $chain_swap\n";
2686             $cmdlist .= "destroy $chain_swap\n";
2687         }
2688
2689     }
2690
2691     foreach my $chain (keys %$statushash) {
2692         next if $statushash->{$chain}->{action} ne 'delete';
2693
2694         $delete_cmdlist .= "flush $chain\n";
2695         $delete_cmdlist .= "destroy $chain\n";
2696     }
2697
2698     my $changes = ($cmdlist || $delete_cmdlist) ? 1 : 0;
2699
2700     return ($cmdlist, $delete_cmdlist, $changes);
2701 }
2702
2703 sub apply_ruleset {
2704     my ($ruleset, $hostfw_conf, $ipset_ruleset, $verbose) = @_;
2705
2706     enable_bridge_firewall();
2707
2708     update_nf_conntrack_max($hostfw_conf);
2709
2710     my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
2711         get_ipset_cmdlist($ipset_ruleset, undef, $verbose);
2712
2713     my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset, $verbose);
2714
2715     if ($verbose) {
2716         if ($ipset_changes) {
2717             print "ipset changes:\n";
2718             print $ipset_create_cmdlist if $ipset_create_cmdlist;
2719             print $ipset_delete_cmdlist if $ipset_delete_cmdlist;
2720         }
2721
2722         if ($changes) {
2723             print "iptables changes:\n";
2724             print $cmdlist;
2725         }
2726     }
2727
2728     ipset_restore_cmdlist($ipset_create_cmdlist);
2729
2730     iptables_restore_cmdlist($cmdlist);
2731
2732     ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
2733
2734     # test: re-read status and check if everything is up to date
2735     my $active_chains = iptables_get_chains();
2736     my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, 0);
2737
2738     my $errors;
2739     foreach my $chain (sort keys %$ruleset) {
2740         my $stat = $statushash->{$chain};
2741         if ($stat->{action} ne 'exists') {
2742             warn "unable to update chain '$chain'\n";
2743             $errors = 1;
2744         }
2745     }
2746
2747     die "unable to apply firewall changes\n" if $errors;
2748 }
2749
2750 sub update_nf_conntrack_max {
2751     my ($hostfw_conf) = @_;
2752
2753     my $max = 65536; # reasonable default
2754
2755     my $options = $hostfw_conf->{options} || {};
2756
2757     if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
2758         $max = $options->{nf_conntrack_max};
2759         $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
2760     }
2761
2762     my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
2763     my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
2764
2765     my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
2766
2767     if ($current != $max) {
2768         my $hashsize = int($max/4);
2769         PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
2770         PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
2771     }
2772 }
2773
2774 sub remove_pvefw_chains {
2775
2776     my ($chash, $hooks) = iptables_get_chains();
2777     my $cmdlist = "*filter\n";
2778
2779     foreach my $h (qw(INPUT OUTPUT FORWARD)) {
2780         if ($hooks->{$h}) {
2781             $cmdlist .= "-D $h -j PVEFW-$h\n";
2782         }
2783     }
2784
2785     foreach my $chain (keys %$chash) {
2786         $cmdlist .= "-F $chain\n";
2787     }
2788
2789     foreach my $chain (keys %$chash) {
2790         $cmdlist .= "-X $chain\n";
2791     }
2792     $cmdlist .= "COMMIT\n";
2793
2794     iptables_restore_cmdlist($cmdlist);
2795 }
2796
2797 sub update {
2798     my ($start, $verbose) = @_;
2799
2800     my $code = sub {
2801         my $status = read_pvefw_status();
2802
2803         my ($ruleset, $hostfw_conf, $ipset_ruleset) = compile();
2804
2805         if ($start || $status eq 'active') {
2806
2807             save_pvefw_status('active') if ($status ne 'active');
2808
2809             apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $verbose);
2810         } else {
2811             print "Firewall not active (status = $status)\n" if $verbose;
2812         }
2813     };
2814
2815     run_locked($code);
2816 }
2817
2818
2819 1;