src/PVE/Firewall.pm

   1 package PVE::Firewall;
   2
   3 use warnings;
   4 use strict;
   5 use Data::Dumper;
   6 use Digest::SHA;
   7 use PVE::INotify;
   8 use PVE::Cluster;
   9 use PVE::ProcFSTools;
  10 use PVE::Tools;
  11 use File::Basename;
  12 use File::Path;
  13 use IO::File;
  14 use Net::IP;
  15 use PVE::Tools qw(run_command lock_file);
  16
  17 # dynamically include PVE::QemuServer and PVE::OpenVZ
  18 # to avoid dependency problems
  19 my $have_qemu_server;
  20 eval {
  21     require PVE::QemuServer;
  22     $have_qemu_server = 1;
  23 };
  24
  25 my $have_pve_manager;
  26 eval {
  27     require PVE::OpenVZ;
  28     $have_pve_manager = 1;
  29 };
  30
  31 use Data::Dumper;
  32
  33 # fixme: remove loglevel settings? NFLOG does not have --loglevel
  34
  35 my $nodename = PVE::INotify::nodename();
  36
  37 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
  38 my $pve_fw_status_filename = "/var/lib/pve-firewall/pvefw.status";
  39
  40 my $default_log_level = 'info';
  41
  42 my $log_level_hash = {
  43     debug => 7,
  44     info => 6,
  45     notice => 5,
  46     warning => 4,
  47     err => 3,
  48     crit => 2,
  49     alert => 1,
  50     emerg => 0,
  51 };
  52
  53 # imported/converted from: /usr/share/shorewall/macro.*
  54 my $pve_fw_macros = {
  55     'Amanda' => [
  56         { action => 'PARAM', proto => 'udp', dport => '10080' },
  57         { action => 'PARAM', proto => 'tcp', dport => '10080' },
  58     ],
  59     'Auth' => [
  60         { action => 'PARAM', proto => 'tcp', dport => '113' },
  61     ],
  62     'BGP' => [
  63         { action => 'PARAM', proto => 'tcp', dport => '179' },
  64     ],
  65     'BitTorrent' => [
  66         { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
  67         { action => 'PARAM', proto => 'udp', dport => '6881' },
  68     ],
  69     'BitTorrent32' => [
  70         { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
  71         { action => 'PARAM', proto => 'udp', dport => '6881' },
  72     ],
  73     'CVS' => [
  74         { action => 'PARAM', proto => 'tcp', dport => '2401' },
  75     ],
  76     'Citrix' => [
  77         { action => 'PARAM', proto => 'tcp', dport => '1494' },
  78         { action => 'PARAM', proto => 'udp', dport => '1604' },
  79         { action => 'PARAM', proto => 'tcp', dport => '2598' },
  80     ],
  81     'DAAP' => [
  82         { action => 'PARAM', proto => 'tcp', dport => '3689' },
  83         { action => 'PARAM', proto => 'udp', dport => '3689' },
  84     ],
  85     'DCC' => [
  86         { action => 'PARAM', proto => 'tcp', dport => '6277' },
  87     ],
  88     'DHCPfwd' => [
  89         { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
  90         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '67:68', sport => '67:68' },
  91     ],
  92     'DNS' => [
  93         { action => 'PARAM', proto => 'udp', dport => '53' },
  94         { action => 'PARAM', proto => 'tcp', dport => '53' },
  95     ],
  96     'Distcc' => [
  97         { action => 'PARAM', proto => 'tcp', dport => '3632' },
  98     ],
  99     'Edonkey' => [
 100         { action => 'PARAM', proto => 'tcp', dport => '4662' },
 101         { action => 'PARAM', proto => 'udp', dport => '4665' },
 102     ],
 103     'FTP' => [
 104         { action => 'PARAM', proto => 'tcp', dport => '21' },
 105     ],
 106     'Finger' => [
 107         { action => 'PARAM', proto => 'tcp', dport => '79' },
 108     ],
 109     'GNUnet' => [
 110         { action => 'PARAM', proto => 'tcp', dport => '2086' },
 111         { action => 'PARAM', proto => 'udp', dport => '2086' },
 112         { action => 'PARAM', proto => 'tcp', dport => '1080' },
 113         { action => 'PARAM', proto => 'udp', dport => '1080' },
 114     ],
 115     'GRE' => [
 116         { action => 'PARAM', proto => '47' },
 117         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '47' },
 118     ],
 119     'Git' => [
 120         { action => 'PARAM', proto => 'tcp', dport => '9418' },
 121     ],
 122     'Gnutella' => [
 123         { action => 'PARAM', proto => 'tcp', dport => '6346' },
 124         { action => 'PARAM', proto => 'udp', dport => '6346' },
 125     ],
 126     'HKP' => [
 127         { action => 'PARAM', proto => 'tcp', dport => '11371' },
 128     ],
 129     'HTTP' => [
 130         { action => 'PARAM', proto => 'tcp', dport => '80' },
 131     ],
 132     'HTTPS' => [
 133         { action => 'PARAM', proto => 'tcp', dport => '443' },
 134     ],
 135     'ICPV2' => [
 136         { action => 'PARAM', proto => 'udp', dport => '3130' },
 137     ],
 138     'ICQ' => [
 139         { action => 'PARAM', proto => 'tcp', dport => '5190' },
 140     ],
 141     'IMAP' => [
 142         { action => 'PARAM', proto => 'tcp', dport => '143' },
 143     ],
 144     'IMAPS' => [
 145         { action => 'PARAM', proto => 'tcp', dport => '993' },
 146     ],
 147     'IPIP' => [
 148         { action => 'PARAM', proto => '94' },
 149         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '94' },
 150     ],
 151     'IPP' => [
 152         { action => 'PARAM', proto => 'tcp', dport => '631' },
 153     ],
 154     'IPPbrd' => [
 155         { action => 'PARAM', proto => 'udp', dport => '631' },
 156     ],
 157     'IPPserver' => [
 158         { action => 'PARAM', source => 'SOURCE', dest => 'DEST', proto => 'tcp', dport => '631' },
 159         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '631' },
 160     ],
 161     'IPsec' => [
 162         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 163         { action => 'PARAM', proto => '50' },
 164         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500', sport => '500' },
 165         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '50' },
 166     ],
 167     'IPsecah' => [
 168         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 169         { action => 'PARAM', proto => '51' },
 170         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500', sport => '500' },
 171         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '51' },
 172     ],
 173     'IPsecnat' => [
 174         { action => 'PARAM', proto => 'udp', dport => '500' },
 175         { action => 'PARAM', proto => 'udp', dport => '4500' },
 176         { action => 'PARAM', proto => '50' },
 177         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500' },
 178         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '4500' },
 179         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '50' },
 180     ],
 181     'IRC' => [
 182         { action => 'PARAM', proto => 'tcp', dport => '6667' },
 183     ],
 184     'JabberPlain' => [
 185         { action => 'PARAM', proto => 'tcp', dport => '5222' },
 186     ],
 187     'JabberSecure' => [
 188         { action => 'PARAM', proto => 'tcp', dport => '5223' },
 189     ],
 190     'Jabberd' => [
 191         { action => 'PARAM', proto => 'tcp', dport => '5269' },
 192     ],
 193     'Jetdirect' => [
 194         { action => 'PARAM', proto => 'tcp', dport => '9100' },
 195     ],
 196     'L2TP' => [
 197         { action => 'PARAM', proto => 'udp', dport => '1701' },
 198         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '1701' },
 199     ],
 200     'LDAP' => [
 201         { action => 'PARAM', proto => 'tcp', dport => '389' },
 202     ],
 203     'LDAPS' => [
 204         { action => 'PARAM', proto => 'tcp', dport => '636' },
 205     ],
 206     'MSNP' => [
 207         { action => 'PARAM', proto => 'tcp', dport => '1863' },
 208     ],
 209     'MSSQL' => [
 210         { action => 'PARAM', proto => 'tcp', dport => '1433' },
 211     ],
 212     'Mail' => [
 213         { action => 'PARAM', proto => 'tcp', dport => '25' },
 214         { action => 'PARAM', proto => 'tcp', dport => '465' },
 215         { action => 'PARAM', proto => 'tcp', dport => '587' },
 216     ],
 217     'Munin' => [
 218         { action => 'PARAM', proto => 'tcp', dport => '4949' },
 219     ],
 220     'MySQL' => [
 221         { action => 'PARAM', proto => 'tcp', dport => '3306' },
 222     ],
 223     'NNTP' => [
 224         { action => 'PARAM', proto => 'tcp', dport => '119' },
 225     ],
 226     'NNTPS' => [
 227         { action => 'PARAM', proto => 'tcp', dport => '563' },
 228     ],
 229     'NTP' => [
 230         { action => 'PARAM', proto => 'udp', dport => '123' },
 231     ],
 232     'NTPbi' => [
 233         { action => 'PARAM', proto => 'udp', dport => '123' },
 234         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '123' },
 235     ],
 236     'NTPbrd' => [
 237         { action => 'PARAM', proto => 'udp', dport => '123' },
 238         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '123' },
 239     ],
 240     'OSPF' => [
 241         { action => 'PARAM', proto => '89' },
 242     ],
 243     'OpenVPN' => [
 244         { action => 'PARAM', proto => 'udp', dport => '1194' },
 245     ],
 246     'PCA' => [
 247         { action => 'PARAM', proto => 'udp', dport => '5632' },
 248         { action => 'PARAM', proto => 'tcp', dport => '5631' },
 249     ],
 250     'POP3' => [
 251         { action => 'PARAM', proto => 'tcp', dport => '110' },
 252     ],
 253     'POP3S' => [
 254         { action => 'PARAM', proto => 'tcp', dport => '995' },
 255     ],
 256     'PPtP' => [
 257         { action => 'PARAM', proto => '47' },
 258         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '47' },
 259         { action => 'PARAM', proto => 'tcp', dport => '1723' },
 260     ],
 261     'Ping' => [
 262         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 263     ],
 264     'PostgreSQL' => [
 265         { action => 'PARAM', proto => 'tcp', dport => '5432' },
 266     ],
 267     'Printer' => [
 268         { action => 'PARAM', proto => 'tcp', dport => '515' },
 269     ],
 270     'RDP' => [
 271         { action => 'PARAM', proto => 'tcp', dport => '3389' },
 272     ],
 273     'RIPbi' => [
 274         { action => 'PARAM', proto => 'udp', dport => '520' },
 275         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '520' },
 276     ],
 277     'RNDC' => [
 278         { action => 'PARAM', proto => 'tcp', dport => '953' },
 279     ],
 280     'Razor' => [
 281         { action => 'ACCEPT', proto => 'tcp', dport => '2703' },
 282     ],
 283     'Rdate' => [
 284         { action => 'PARAM', proto => 'tcp', dport => '37' },
 285     ],
 286     'Rsync' => [
 287         { action => 'PARAM', proto => 'tcp', dport => '873' },
 288     ],
 289     'SANE' => [
 290         { action => 'PARAM', proto => 'tcp', dport => '6566' },
 291     ],
 292     'SMB' => [
 293         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 294         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 295         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 296         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 297     ],
 298     'SMBBI' => [
 299         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 300         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 301         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 302         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 303         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '135,445' },
 304         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '137:139' },
 305         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '1024:65535', sport => '137' },
 306         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'tcp', dport => '135,139,445' },
 307     ],
 308     'SMBswat' => [
 309         { action => 'PARAM', proto => 'tcp', dport => '901' },
 310     ],
 311     'SMTP' => [
 312         { action => 'PARAM', proto => 'tcp', dport => '25' },
 313     ],
 314     'SMTPS' => [
 315         { action => 'PARAM', proto => 'tcp', dport => '465' },
 316     ],
 317     'SNMP' => [
 318         { action => 'PARAM', proto => 'udp', dport => '161:162' },
 319         { action => 'PARAM', proto => 'tcp', dport => '161' },
 320     ],
 321     'SPAMD' => [
 322         { action => 'PARAM', proto => 'tcp', dport => '783' },
 323     ],
 324     'SSH' => [
 325         { action => 'PARAM', proto => 'tcp', dport => '22' },
 326     ],
 327     'SVN' => [
 328         { action => 'PARAM', proto => 'tcp', dport => '3690' },
 329     ],
 330     'SixXS' => [
 331         { action => 'PARAM', proto => 'tcp', dport => '3874' },
 332         { action => 'PARAM', proto => 'udp', dport => '3740' },
 333         { action => 'PARAM', proto => '41' },
 334         { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
 335     ],
 336     'Squid' => [
 337         { action => 'PARAM', proto => 'tcp', dport => '3128' },
 338     ],
 339     'Submission' => [
 340         { action => 'PARAM', proto => 'tcp', dport => '587' },
 341     ],
 342     'Syslog' => [
 343         { action => 'PARAM', proto => 'udp', dport => '514' },
 344         { action => 'PARAM', proto => 'tcp', dport => '514' },
 345     ],
 346     'TFTP' => [
 347         { action => 'PARAM', proto => 'udp', dport => '69' },
 348     ],
 349     'Telnet' => [
 350         { action => 'PARAM', proto => 'tcp', dport => '23' },
 351     ],
 352     'Telnets' => [
 353         { action => 'PARAM', proto => 'tcp', dport => '992' },
 354     ],
 355     'Time' => [
 356         { action => 'PARAM', proto => 'tcp', dport => '37' },
 357     ],
 358     'Trcrt' => [
 359         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 360         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 361     ],
 362     'VNC' => [
 363         { action => 'PARAM', proto => 'tcp', dport => '5900:5909' },
 364     ],
 365     'VNCL' => [
 366         { action => 'PARAM', proto => 'tcp', dport => '5500' },
 367     ],
 368     'Web' => [
 369         { action => 'PARAM', proto => 'tcp', dport => '80' },
 370         { action => 'PARAM', proto => 'tcp', dport => '443' },
 371     ],
 372     'Webcache' => [
 373         { action => 'PARAM', proto => 'tcp', dport => '8080' },
 374     ],
 375     'Webmin' => [
 376         { action => 'PARAM', proto => 'tcp', dport => '10000' },
 377     ],
 378     'Whois' => [
 379         { action => 'PARAM', proto => 'tcp', dport => '43' },
 380     ],
 381 };
 382
 383 my $pve_fw_parsed_macros;
 384 my $pve_fw_preferred_macro_names = {};
 385
 386 my $pve_std_chains = {
 387     'PVEFW-SET-ACCEPT-MARK' => [
 388         "-j MARK --set-mark 1",
 389     ],
 390     'PVEFW-DropBroadcast' => [
 391         # same as shorewall 'Broadcast'
 392         # simply DROP BROADCAST/MULTICAST/ANYCAST
 393         # we can use this to reduce logging
 394         { action => 'DROP', dsttype => 'BROADCAST' },
 395         { action => 'DROP', dsttype => 'MULTICAST' },
 396         { action => 'DROP', dsttype => 'ANYCAST' },
 397         { action => 'DROP', dest => '224.0.0.0/4' },
 398     ],
 399     'PVEFW-reject' => [
 400         # same as shorewall 'reject'
 401         { action => 'DROP', dsttype => 'BROADCAST' },
 402         { action => 'DROP', source => '224.0.0.0/4' },
 403         { action => 'DROP', proto => 'icmp' },
 404         "-p tcp -j REJECT --reject-with tcp-reset",
 405         "-p udp -j REJECT --reject-with icmp-port-unreachable",
 406         "-p icmp -j REJECT --reject-with icmp-host-unreachable",
 407         "-j REJECT --reject-with icmp-host-prohibited",
 408     ],
 409     'PVEFW-Drop' => [
 410         # same as shorewall 'Drop', which is equal to DROP,
 411         # but REJECT/DROP some packages to reduce logging,
 412         # and ACCEPT critical ICMP types
 413         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 414         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 415         { action => 'PVEFW-DropBroadcast' },
 416         # ACCEPT critical ICMP types
 417         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 418         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 419         # Drop packets with INVALID state
 420         "-m conntrack --ctstate INVALID -j DROP",
 421         # Drop Microsoft SMB noise
 422         { action => 'DROP', proto => 'udp', dport => '135,445', nbdport => 2 },
 423         { action => 'DROP', proto => 'udp', dport => '137:139'},
 424         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 425         { action => 'DROP', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
 426         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 427         # Drop new/NotSyn traffic so that it doesn't get logged
 428         "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
 429         # Drop DNS replies
 430         { action => 'DROP', proto => 'udp', sport => 53 },
 431     ],
 432     'PVEFW-Reject' => [
 433         # same as shorewall 'Reject', which is equal to Reject,
 434         # but REJECT/DROP some packages to reduce logging,
 435         # and ACCEPT critical ICMP types
 436         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 437         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 438         { action => 'PVEFW-DropBroadcast' },
 439         # ACCEPT critical ICMP types
 440         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 441         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 442         # Drop packets with INVALID state
 443         "-m conntrack --ctstate INVALID -j DROP",
 444         # Drop Microsoft SMB noise
 445         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445', nbdport => 2 },
 446         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
 447         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 448         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
 449         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 450         # Drop new/NotSyn traffic so that it doesn't get logged
 451         "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
 452         # Drop DNS replies
 453         { action => 'DROP', proto => 'udp', sport => 53 },
 454     ],
 455     'PVEFW-tcpflags' => [
 456         # same as shorewall tcpflags action.
 457         # Packets arriving on this interface are checked for som illegal combinations of TCP flags
 458         "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
 459         "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
 460         "-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
 461         "-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
 462         "-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
 463     ],
 464     'PVEFW-smurfs' => [
 465         # same as shorewall smurfs action
 466         # Filter packets for smurfs (packets with a broadcast address as the source).
 467         "-s 0.0.0.0/32 -j RETURN",
 468         "-m addrtype --src-type BROADCAST -g PVEFW-smurflog",
 469         "-s 224.0.0.0/4 -g PVEFW-smurflog",
 470     ],
 471 };
 472
 473 # iptables -p icmp -h
 474 my $icmp_type_names = {
 475     any => 1,
 476     'echo-reply' => 1,
 477     'destination-unreachable' => 1,
 478     'network-unreachable' => 1,
 479     'host-unreachable' => 1,
 480     'protocol-unreachable' => 1,
 481     'port-unreachable' => 1,
 482     'fragmentation-needed' => 1,
 483     'source-route-failed' => 1,
 484     'network-unknown' => 1,
 485     'host-unknown' => 1,
 486     'network-prohibited' => 1,
 487     'host-prohibited' => 1,
 488     'TOS-network-unreachable' => 1,
 489     'TOS-host-unreachable' => 1,
 490     'communication-prohibited' => 1,
 491     'host-precedence-violation' => 1,
 492     'precedence-cutoff' => 1,
 493     'source-quench' => 1,
 494     'redirect' => 1,
 495     'network-redirect' => 1,
 496     'host-redirect' => 1,
 497     'TOS-network-redirect' => 1,
 498     'TOS-host-redirect' => 1,
 499     'echo-request' => 1,
 500     'router-advertisement' => 1,
 501     'router-solicitation' => 1,
 502     'time-exceeded' => 1,
 503     'ttl-zero-during-transit' => 1,
 504     'ttl-zero-during-reassembly' => 1,
 505     'parameter-problem' => 1,
 506     'ip-header-bad' => 1,
 507     'required-option-missing' => 1,
 508     'timestamp-request' => 1,
 509     'timestamp-reply' => 1,
 510     'address-mask-request' => 1,
 511     'address-mask-reply' => 1,
 512 };
 513
 514 sub get_firewall_macros {
 515
 516     return $pve_fw_parsed_macros if $pve_fw_parsed_macros;
 517
 518     $pve_fw_parsed_macros = {};
 519
 520     foreach my $k (keys %$pve_fw_macros) {
 521         my $name = lc($k);
 522
 523         my $macro =  $pve_fw_macros->{$k};
 524         $pve_fw_preferred_macro_names->{$name} = $k;
 525         $pve_fw_parsed_macros->{$name} = $macro;
 526     }
 527
 528     return $pve_fw_parsed_macros;
 529 }
 530
 531 my $etc_services;
 532
 533 sub get_etc_services {
 534
 535     return $etc_services if $etc_services;
 536
 537     my $filename = "/etc/services";
 538
 539     my $fh = IO::File->new($filename, O_RDONLY);
 540     if (!$fh) {
 541         warn "unable to read '$filename' - $!\n";
 542         return {};
 543     }
 544
 545     my $services = {};
 546
 547     while (my $line = <$fh>) {
 548         chomp ($line);
 549         next if $line =~m/^#/;
 550         next if ($line =~m/^\s*$/);
 551
 552         if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp).*$!) {
 553             $services->{byid}->{$2}->{name} = $1;
 554             $services->{byid}->{$2}->{port} = $2;
 555             $services->{byid}->{$2}->{$3} = 1;
 556             $services->{byname}->{$1} = $services->{byid}->{$2};
 557         }
 558     }
 559
 560     close($fh);
 561
 562     $etc_services = $services;
 563
 564
 565     return $etc_services;
 566 }
 567
 568 my $etc_protocols;
 569
 570 sub get_etc_protocols {
 571     return $etc_protocols if $etc_protocols;
 572
 573     my $filename = "/etc/protocols";
 574
 575     my $fh = IO::File->new($filename, O_RDONLY);
 576     if (!$fh) {
 577         warn "unable to read '$filename' - $!\n";
 578         return {};
 579     }
 580
 581     my $protocols = {};
 582
 583     while (my $line = <$fh>) {
 584         chomp ($line);
 585         next if $line =~m/^#/;
 586         next if ($line =~m/^\s*$/);
 587
 588         if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
 589             $protocols->{byid}->{$2}->{name} = $1;
 590             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
 591         }
 592     }
 593
 594     close($fh);
 595
 596     $etc_protocols = $protocols;
 597
 598     return $etc_protocols;
 599 }
 600
 601 sub parse_address_list {
 602     my ($str) = @_;
 603
 604     my $nbaor = 0;
 605     foreach my $aor (split(/,/, $str)) {
 606         if (!Net::IP->new($aor)) {
 607             my $err = Net::IP::Error();
 608             die "invalid IP address: $err\n";
 609         }else{
 610             $nbaor++;
 611         }
 612     }
 613     return $nbaor;
 614 }
 615
 616 sub parse_port_name_number_or_range {
 617     my ($str) = @_;
 618
 619     my $services = PVE::Firewall::get_etc_services();
 620     my $nbports = 0;
 621     foreach my $item (split(/,/, $str)) {
 622         my $portlist = "";
 623         my $oldpon = undef;
 624         $nbports++;
 625         foreach my $pon (split(':', $item, 2)) {
 626             $pon = $services->{byname}->{$pon}->{port} if $services->{byname}->{$pon}->{port};
 627             if ($pon =~ m/^\d+$/){
 628                 die "invalid port '$pon'\n" if $pon < 0 && $pon > 65535;
 629                 die "port '$pon' must be bigger than port '$oldpon' \n" if $oldpon && ($pon < $oldpon);
 630                 $oldpon = $pon;
 631             }else{
 632                 die "invalid port $services->{byname}->{$pon}\n" if !$services->{byname}->{$pon};
 633             }
 634         }
 635     }
 636
 637     return ($nbports);
 638 }
 639
 640 my $bridge_firewall_enabled = 0;
 641
 642 sub enable_bridge_firewall {
 643
 644     return if $bridge_firewall_enabled; # only once
 645
 646     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
 647     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
 648
 649     # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
 650     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
 651
 652     $bridge_firewall_enabled = 1;
 653 }
 654
 655 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
 656
 657 sub iptables {
 658     my ($cmd) = @_;
 659
 660     run_command("/sbin/iptables $cmd", outfunc => sub {}, errfunc => sub {});
 661 }
 662
 663 sub iptables_restore_cmdlist {
 664     my ($cmdlist) = @_;
 665
 666     run_command("/sbin/iptables-restore -n", input => $cmdlist);
 667 }
 668
 669 sub iptables_get_chains {
 670
 671     my $res = {};
 672
 673     # check what chains we want to track
 674     my $is_pvefw_chain = sub {
 675         my $name = shift;
 676
 677         return 1 if $name =~ m/^PVEFW-\S+$/;
 678
 679         return 1 if $name =~ m/^tap\d+i\d+-(:?IN|OUT)$/;
 680
 681         return 1 if $name =~ m/^veth\d+.\d+-(:?IN|OUT)$/; # fixme: dev name is configurable
 682
 683         return 1 if $name =~ m/^venet0-\d+-(:?IN|OUT)$/;
 684
 685         return 1 if $name =~ m/^vmbr\d+-(:?FW|IN|OUT)$/;
 686         return 1 if $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/;
 687
 688         return undef;
 689     };
 690
 691     my $table = '';
 692
 693     my $parser = sub {
 694         my $line = shift;
 695
 696         return if $line =~ m/^#/;
 697         return if $line =~ m/^\s*$/;
 698
 699         if ($line =~ m/^\*(\S+)$/) {
 700             $table = $1;
 701             return;
 702         }
 703
 704         return if $table ne 'filter';
 705
 706         if ($line =~ m/^:(\S+)\s/) {
 707             my $chain = $1;
 708             return if !&$is_pvefw_chain($chain);
 709             $res->{$chain} = "unknown";
 710         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
 711             my ($chain, $sig) = ($1, $2);
 712             return if !&$is_pvefw_chain($chain);
 713             $res->{$chain} = $sig;
 714         } else {
 715             # simply ignore the rest
 716             return;
 717         }
 718     };
 719
 720     run_command("/sbin/iptables-save", outfunc => $parser);
 721
 722     return $res;
 723 }
 724
 725 sub iptables_chain_exist {
 726     my ($chain) = @_;
 727
 728     eval{
 729         iptables("-n --list $chain");
 730     };
 731     return undef if $@;
 732
 733     return 1;
 734 }
 735
 736 sub iptables_rule_exist {
 737     my ($rule) = @_;
 738
 739     eval{
 740         iptables("-C $rule");
 741     };
 742     return undef if $@;
 743
 744     return 1;
 745 }
 746
 747 sub ruleset_generate_cmdstr {
 748     my ($ruleset, $chain, $rule, $actions, $goto) = @_;
 749
 750     return if $rule->{disable};
 751
 752     my @cmd = ();
 753
 754     push @cmd, "-i $rule->{iface_in}" if $rule->{iface_in};
 755     push @cmd, "-o $rule->{iface_out}" if $rule->{iface_out};
 756
 757     push @cmd, "-m iprange --src-range" if $rule->{nbsource} && $rule->{nbsource} > 1;
 758     push @cmd, "-s $rule->{source}" if $rule->{source};
 759     push @cmd, "-m iprange --dst-range" if $rule->{nbdest} && $rule->{nbdest} > 1;
 760     push @cmd, "-d $rule->{dest}" if $rule->{dest};
 761
 762     if ($rule->{proto}) {
 763         push @cmd, "-p $rule->{proto}";
 764
 765         my $multiport = 0;
 766         $multiport++ if $rule->{nbdport} && ($rule->{nbdport} > 1);
 767         $multiport++ if $rule->{nbsport} && ($rule->{nbsport} > 1);
 768
 769         push @cmd, "--match multiport" if $multiport;
 770
 771         die "multiport: option '--sports' cannot be used together with '--dports'\n"
 772             if ($multiport == 2) && ($rule->{dport} ne $rule->{sport});
 773
 774         if ($rule->{dport}) {
 775             if ($rule->{proto} && $rule->{proto} eq 'icmp') {
 776                 # Note: we use dport to store --icmp-type
 777                 die "unknown icmp-type '$rule->{dport}'\n" if !defined($icmp_type_names->{$rule->{dport}});
 778                 push @cmd, "-m icmp --icmp-type $rule->{dport}";
 779             } else {
 780                 if ($rule->{nbdport} && $rule->{nbdport} > 1) {
 781                     if ($multiport == 2) {
 782                         push @cmd,  "--ports $rule->{dport}";
 783                     } else {
 784                         push @cmd, "--dports $rule->{dport}";
 785                     }
 786                 } else {
 787                     push @cmd, "--dport $rule->{dport}";
 788                 }
 789             }
 790         }
 791
 792         if ($rule->{sport}) {
 793             if ($rule->{nbsport} && $rule->{nbsport} > 1) {
 794                 push @cmd, "--sports $rule->{sport}" if $multiport != 2;
 795             } else {
 796                 push @cmd, "--sport $rule->{sport}";
 797             }
 798         }
 799     } elsif ($rule->{dport} || $rule->{sport}) {
 800         warn "ignoring destination port '$rule->{dport}' - no protocol specified\n" if $rule->{dport};
 801         warn "ignoring source port '$rule->{sport}' - no protocol specified\n" if $rule->{sport};
 802     }
 803
 804     push @cmd, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
 805
 806     if (my $action = $rule->{action}) {
 807         $action = $actions->{$action} if defined($actions->{$action});
 808         $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
 809         push @cmd, $goto ? "-g $action" : "-j $action";
 810     }
 811
 812     return scalar(@cmd) ? join(' ', @cmd) : undef;
 813 }
 814
 815 sub ruleset_generate_rule {
 816     my ($ruleset, $chain, $rule, $actions, $goto) = @_;
 817
 818     if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $rule, $actions, $goto)) {
 819         ruleset_addrule($ruleset, $chain, $cmdstr);
 820     }
 821 }
 822 sub ruleset_generate_rule_insert {
 823     my ($ruleset, $chain, $rule, $actions, $goto) = @_;
 824
 825     if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $rule, $actions, $goto)) {
 826         ruleset_insertrule($ruleset, $chain, $cmdstr);
 827     }
 828 }
 829
 830 sub ruleset_create_chain {
 831     my ($ruleset, $chain) = @_;
 832
 833     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
 834     die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
 835
 836     die "chain '$chain' already exists\n" if $ruleset->{$chain};
 837
 838     $ruleset->{$chain} = [];
 839 }
 840
 841 sub ruleset_chain_exist {
 842     my ($ruleset, $chain) = @_;
 843
 844     return $ruleset->{$chain} ? 1 : undef;
 845 }
 846
 847 sub ruleset_addrule {
 848    my ($ruleset, $chain, $rule) = @_;
 849
 850    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 851
 852    push @{$ruleset->{$chain}}, "-A $chain $rule";
 853 }
 854
 855 sub ruleset_insertrule {
 856    my ($ruleset, $chain, $rule) = @_;
 857
 858    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 859
 860    unshift @{$ruleset->{$chain}}, "-A $chain $rule";
 861 }
 862
 863 sub get_log_rule_base {
 864     my ($chain, $vmid, $msg, $loglevel) = @_;
 865
 866     die "internal error - no log level" if !defined($loglevel);
 867
 868     $vmid = 0 if !defined($vmid);
 869
 870     # Note: we use special format for prefix to pass further
 871     # info to log daemon (VMID, LOGVELEL and CHAIN)
 872
 873     return "-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
 874 }
 875
 876 sub ruleset_addlog {
 877     my ($ruleset, $chain, $vmid, $msg, $loglevel, $rule) = @_;
 878
 879     return if !defined($loglevel);
 880
 881     my $logrule = get_log_rule_base($chain, $vmid, $msg, $loglevel);
 882
 883     $logrule = "$rule $logrule" if defined($rule);
 884
 885     ruleset_addrule($ruleset, $chain, $logrule)
 886 }
 887
 888 sub generate_bridge_chains {
 889     my ($ruleset, $hostfw_conf, $bridge, $routing_table) = @_;
 890
 891     my $options = $hostfw_conf->{options} || {};
 892
 893     die "error: detected direct route to bridge '$bridge'\n"
 894         if !$options->{allow_bridge_route} && $routing_table->{$bridge};
 895
 896     if (!ruleset_chain_exist($ruleset, "$bridge-FW")) {
 897         ruleset_create_chain($ruleset, "$bridge-FW");
 898         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -m physdev --physdev-is-out -j $bridge-FW");
 899         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -m physdev --physdev-is-in -j $bridge-FW");
 900     }
 901
 902     if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) {
 903         ruleset_create_chain($ruleset, "$bridge-OUT");
 904         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-in -j $bridge-OUT");
 905         ruleset_insertrule($ruleset, "PVEFW-INPUT", "-i $bridge -m physdev --physdev-is-in -j $bridge-OUT");
 906     }
 907
 908     if (!ruleset_chain_exist($ruleset, "$bridge-IN")) {
 909         ruleset_create_chain($ruleset, "$bridge-IN");
 910         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-out -j $bridge-IN");
 911         ruleset_addrule($ruleset, "$bridge-FW", "-m mark --mark 1 -j ACCEPT");
 912         # accept traffic to unmanaged bridge ports
 913         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-out -j ACCEPT ");
 914     }
 915 }
 916
 917 sub ruleset_add_chain_policy {
 918     my ($ruleset, $chain, $vmid, $policy, $loglevel, $accept_action) = @_;
 919
 920     if ($policy eq 'ACCEPT') {
 921
 922         ruleset_generate_rule($ruleset, $chain, { action => 'ACCEPT' },
 923                               { ACCEPT =>  $accept_action});
 924
 925     } elsif ($policy eq 'DROP') {
 926
 927         ruleset_addrule($ruleset, $chain, "-j PVEFW-Drop");
 928
 929         ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
 930
 931         ruleset_addrule($ruleset, $chain, "-j DROP");
 932     } elsif ($policy eq 'REJECT') {
 933         ruleset_addrule($ruleset, $chain, "-j PVEFW-Reject");
 934
 935         ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
 936
 937         ruleset_addrule($ruleset, $chain, "-g PVEFW-reject");
 938     } else {
 939         # should not happen
 940         die "internal error: unknown policy '$policy'";
 941     }
 942 }
 943
 944 sub ruleset_create_vm_chain {
 945     my ($ruleset, $chain, $options, $macaddr, $direction) = @_;
 946
 947     ruleset_create_chain($ruleset, $chain);
 948
 949     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
 950         ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
 951     }
 952
 953     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
 954         ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 67:68 -j ACCEPT");
 955     }
 956
 957     if ($options->{tcpflags}) {
 958         ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
 959     }
 960
 961     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
 962     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 963
 964     if ($direction eq 'OUT') {
 965         if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
 966             ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr -j DROP");
 967         }
 968         ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
 969     }
 970 }
 971
 972 sub ruleset_generate_vm_rules {
 973     my ($ruleset, $rules, $groups_conf, $chain, $netid, $direction) = @_;
 974
 975     my $lc_direction = lc($direction);
 976
 977     foreach my $rule (@$rules) {
 978         next if $rule->{iface} && $rule->{iface} ne $netid;
 979         next if $rule->{disable};
 980         if ($rule->{type} eq 'group') {
 981             my $group_chain = "GROUP-$rule->{action}-$direction";
 982             if(!ruleset_chain_exist($ruleset, $group_chain)){
 983                 generate_group_rules($ruleset, $groups_conf, $rule->{action});
 984             }
 985             ruleset_addrule($ruleset, $chain, "-j $group_chain");
 986             ruleset_addrule($ruleset, $chain, "-m mark --mark 1 -j RETURN")
 987                 if $direction eq 'OUT';
 988         } else {
 989             next if $rule->{type} ne $lc_direction;
 990             if ($direction eq 'OUT') {
 991                 ruleset_generate_rule($ruleset, $chain, $rule,
 992                                       { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
 993             } else {
 994                 ruleset_generate_rule($ruleset, $chain, $rule, { REJECT => "PVEFW-reject" });
 995             }
 996         }
 997     }
 998 }
 999
1000 sub generate_venet_rules_direction {
1001     my ($ruleset, $groups_conf, $vmfw_conf, $vmid, $ip, $direction) = @_;
1002
1003     parse_address_list($ip); # make sure we have a valid $ip list
1004
1005     my $lc_direction = lc($direction);
1006
1007     my $rules = $vmfw_conf->{rules};
1008
1009     my $options = $vmfw_conf->{options};
1010     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
1011
1012     my $chain = "venet0-$vmid-$direction";
1013
1014     ruleset_create_vm_chain($ruleset, $chain, $options, undef, $direction);
1015
1016     ruleset_generate_vm_rules($ruleset, $rules, $groups_conf, $chain, 'venet', $direction);
1017
1018     # implement policy
1019     my $policy;
1020
1021     if ($direction eq 'OUT') {
1022         $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1023     } else {
1024         $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1025     }
1026
1027     my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : "ACCEPT";
1028     ruleset_add_chain_policy($ruleset, $chain, $vmid, $policy, $loglevel, $accept_action);
1029
1030     # plug into FORWARD, INPUT and OUTPUT chain
1031     if ($direction eq 'OUT') {
1032         ruleset_generate_rule_insert($ruleset, "PVEFW-FORWARD", {
1033             action => $chain,
1034             source => $ip,
1035             iface_in => 'venet0'});
1036
1037         ruleset_generate_rule_insert($ruleset, "PVEFW-INPUT", {
1038             action => $chain,
1039             source => $ip,
1040             iface_in => 'venet0'});
1041     } else {
1042         ruleset_generate_rule($ruleset, "PVEFW-FORWARD", {
1043             action => $chain,
1044             dest => $ip,
1045             iface_out => 'venet0'});
1046
1047         ruleset_generate_rule($ruleset, "PVEFW-OUTPUT", {
1048             action => $chain,
1049             dest => $ip,
1050             iface_out => 'venet0'});
1051     }
1052 }
1053
1054 sub generate_tap_rules_direction {
1055     my ($ruleset, $groups_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $bridge, $direction) = @_;
1056
1057     my $lc_direction = lc($direction);
1058
1059     my $rules = $vmfw_conf->{rules};
1060
1061     my $options = $vmfw_conf->{options};
1062     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
1063
1064     my $tapchain = "$iface-$direction";
1065
1066     ruleset_create_vm_chain($ruleset, $tapchain, $options, $macaddr, $direction);
1067
1068     ruleset_generate_vm_rules($ruleset, $rules, $groups_conf, $tapchain, $netid, $direction);
1069
1070     # implement policy
1071     my $policy;
1072
1073     if ($direction eq 'OUT') {
1074         $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1075     } else {
1076         $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1077     }
1078
1079     my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : "ACCEPT";
1080     ruleset_add_chain_policy($ruleset, $tapchain, $vmid, $policy, $loglevel, $accept_action);
1081
1082     # plug the tap chain to bridge chain
1083     if ($direction eq 'IN') {
1084         ruleset_insertrule($ruleset, "$bridge-IN",
1085                            "-m physdev --physdev-is-bridged --physdev-out $iface -j $tapchain");
1086     } else {
1087         ruleset_insertrule($ruleset, "$bridge-OUT",
1088                            "-m physdev --physdev-in $iface -j $tapchain");
1089     }
1090 }
1091
1092 sub enable_host_firewall {
1093     my ($ruleset, $hostfw_conf, $groups_conf) = @_;
1094
1095     # fixme: allow security groups
1096
1097     my $options = $hostfw_conf->{options};
1098     my $rules = $hostfw_conf->{rules};
1099
1100     # host inbound firewall
1101     my $chain = "PVEFW-HOST-IN";
1102     ruleset_create_chain($ruleset, $chain);
1103
1104     my $loglevel = get_option_log_level($options, "log_level_in");
1105
1106     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1107     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
1108     ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
1109     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
1110     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW --dport 5404:5405 -j ACCEPT");
1111     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT");  #corosync
1112
1113     # we use RETURN because we need to check also tap rules
1114     my $accept_action = 'RETURN';
1115
1116     foreach my $rule (@$rules) {
1117         next if $rule->{type} ne 'in';
1118         ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
1119     }
1120
1121     # implement input policy
1122     my $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1123     ruleset_add_chain_policy($ruleset, $chain, 0, $policy, $loglevel, $accept_action);
1124
1125     # host outbound firewall
1126     $chain = "PVEFW-HOST-OUT";
1127     ruleset_create_chain($ruleset, $chain);
1128
1129     $loglevel = get_option_log_level($options, "log_level_out");
1130
1131     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1132     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
1133     ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
1134     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
1135     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW --dport 5404:5405 -j ACCEPT");
1136     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
1137
1138     # we use RETURN because we may want to check other thigs later
1139     $accept_action = 'RETURN';
1140
1141     foreach my $rule (@$rules) {
1142         next if $rule->{type} ne 'out';
1143         ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
1144     }
1145
1146     # implement output policy
1147     $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1148     ruleset_add_chain_policy($ruleset, $chain, 0, $policy, $loglevel, $accept_action);
1149
1150     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
1151     ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
1152 }
1153
1154 sub generate_group_rules {
1155     my ($ruleset, $groups_conf, $group) = @_;
1156
1157     die "no such security group '$group'\n" if !$groups_conf->{$group};
1158
1159     my $rules = $groups_conf->{$group}->{rules};
1160
1161     my $chain = "GROUP-${group}-IN";
1162
1163     ruleset_create_chain($ruleset, $chain);
1164
1165     foreach my $rule (@$rules) {
1166         next if $rule->{type} ne 'in';
1167         ruleset_generate_rule($ruleset, $chain, $rule, { REJECT => "PVEFW-reject" });
1168     }
1169
1170     $chain = "GROUP-${group}-OUT";
1171
1172     ruleset_create_chain($ruleset, $chain);
1173     ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1174
1175     foreach my $rule (@$rules) {
1176         next if $rule->{type} ne 'out';
1177         # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
1178         # check also other tap rules later
1179         ruleset_generate_rule($ruleset, $chain, $rule,
1180                               { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" });
1181     }
1182 }
1183
1184 my $MAX_NETS = 32;
1185 my $valid_netdev_names = {};
1186 for (my $i = 0; $i < $MAX_NETS; $i++)  {
1187     $valid_netdev_names->{"net$i"} = 1;
1188 }
1189
1190 sub parse_fw_rule {
1191     my ($line, $need_iface, $allow_groups) = @_;
1192
1193     my $macros = get_firewall_macros();
1194     my $protocols = get_etc_protocols();
1195
1196     my ($type, $action, $iface, $source, $dest, $proto, $dport, $sport);
1197
1198     # we can add single line comments to the end of the rule
1199     my $comment = $1 if $line =~ s/#\s*(.*?)\s*$//;
1200
1201     # we can disable a rule when prefixed with '|'
1202     my $disable = 1 if  $line =~ s/^\|//;
1203
1204     my @data = split(/\s+/, $line);
1205     my $expected_elements = $need_iface ? 8 : 7;
1206
1207     die "wrong number of rule elements\n" if scalar(@data) > $expected_elements;
1208
1209     if ($need_iface) {
1210         ($type, $action, $iface, $source, $dest, $proto, $dport, $sport) = @data
1211     } else {
1212         ($type, $action, $source, $dest, $proto, $dport, $sport) =  @data;
1213     }
1214
1215     die "incomplete rule\n" if ! ($type && $action);
1216
1217     my $macro;
1218     my $macro_name;
1219
1220     $type = lc($type);
1221
1222     if ($type eq  'in' || $type eq 'out') {
1223         if ($action =~ m/^(ACCEPT|DROP|REJECT)$/) {
1224             # OK
1225         } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
1226             ($macro_name, $action) = ($1, $2);
1227             my $lc_macro_name = lc($macro_name);
1228             my $preferred_name = $pve_fw_preferred_macro_names->{$lc_macro_name};
1229             $macro_name = $preferred_name if $preferred_name;
1230             $macro = $macros->{$lc_macro_name};
1231             die "unknown macro '$macro_name'\n" if !$macro;
1232         } else {
1233             die "unknown action '$action'\n";
1234         }
1235     } elsif ($type eq 'group') {
1236         die "wrong number of rule elements\n" if scalar(@data) != 3;
1237         die "groups disabled\n" if !$allow_groups;
1238
1239         die "invalid characters in group name\n" if $action !~ m/^[A-Za-z0-9_\-]+$/;
1240     } else {
1241         die "unknown rule type '$type'\n";
1242     }
1243
1244     if ($need_iface) {
1245         $iface = undef if $iface && $iface eq '-';
1246     }
1247
1248     $proto = undef if $proto && $proto eq '-';
1249     die "unknown protokol '$proto'\n" if $proto &&
1250         !(defined($protocols->{byname}->{$proto}) ||
1251           defined($protocols->{byid}->{$proto}));
1252
1253     $source = undef if $source && $source eq '-';
1254     $dest = undef if $dest && $dest eq '-';
1255
1256     $dport = undef if $dport && $dport eq '-';
1257     $sport = undef if $sport && $sport eq '-';
1258
1259     my $nbsource = undef;
1260     my $nbdest = undef;
1261
1262     $nbsource = parse_address_list($source) if $source;
1263     $nbdest = parse_address_list($dest) if $dest;
1264
1265     my $rules = [];
1266
1267     my $param = {
1268         type => $type,
1269         disable => $disable,
1270         comment => $comment,
1271         action => $action,
1272         iface => $iface,
1273         source => $source,
1274         dest => $dest,
1275         nbsource => $nbsource,
1276         nbdest => $nbdest,
1277         proto => $proto,
1278         dport => $dport,
1279         sport => $sport,
1280     };
1281
1282     if ($macro) {
1283         foreach my $templ (@$macro) {
1284             my $rule = {};
1285             my $param_used = {};
1286             foreach my $k (keys %$templ) {
1287                 my $v = $templ->{$k};
1288                 if ($v eq 'PARAM') {
1289                     $v = $param->{$k};
1290                     $param_used->{$k} = 1;
1291                 } elsif ($v eq 'DEST') {
1292                     $v = $param->{dest};
1293                     $param_used->{dest} = 1;
1294                 } elsif ($v eq 'SOURCE') {
1295                     $v = $param->{source};
1296                     $param_used->{source} = 1;
1297                 }
1298
1299                 die "missing parameter '$k' in macro '$macro_name'\n" if !defined($v);
1300                 $rule->{$k} = $v;
1301             }
1302             foreach my $k (keys %$param) {
1303                 next if !defined($param->{$k});
1304                 next if $param_used->{$k};
1305                 if (defined($rule->{$k})) {
1306                     die "parameter '$k' already define in macro (value = '$rule->{$k}')\n"
1307                         if $rule->{$k} ne $param->{$k};
1308                 } else {
1309                     $rule->{$k} = $param->{$k};
1310                 }
1311             }
1312             push @$rules, $rule;
1313         }
1314     } else {
1315         push @$rules, $param;
1316     }
1317
1318     foreach my $rule (@$rules) {
1319         $rule->{nbdport} = parse_port_name_number_or_range($rule->{dport})
1320             if defined($rule->{dport});
1321         $rule->{nbsport} = parse_port_name_number_or_range($rule->{sport})
1322             if defined($rule->{sport});
1323     }
1324
1325     return $rules;
1326 }
1327
1328 sub parse_vmfw_option {
1329     my ($line) = @_;
1330
1331     my ($opt, $value);
1332
1333     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1334
1335     if ($line =~ m/^(enable|dhcp|macfilter|nosmurfs|tcpflags):\s*(0|1)\s*$/i) {
1336         $opt = lc($1);
1337         $value = int($2);
1338     } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
1339         $opt = lc($1);
1340         $value = $2 ? lc($3) : '';
1341     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1342         $opt = lc($1);
1343         $value = uc($3);
1344     } else {
1345         chomp $line;
1346         die "can't parse option '$line'\n"
1347     }
1348
1349     return ($opt, $value);
1350 }
1351
1352 sub parse_hostfw_option {
1353     my ($line) = @_;
1354
1355     my ($opt, $value);
1356
1357     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1358
1359     if ($line =~ m/^(enable|dhcp|nosmurfs|tcpflags|allow_bridge_route):\s*(0|1)\s*$/i) {
1360         $opt = lc($1);
1361         $value = int($2);
1362     } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
1363         $opt = lc($1);
1364         $value = $2 ? lc($3) : '';
1365     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1366         $opt = lc($1);
1367         $value = uc($3);
1368     } elsif ($line =~ m/^(nf_conntrack_max):\s*(\d+)\s*$/i) {
1369         $opt = lc($1);
1370         $value = int($2);
1371     } else {
1372         chomp $line;
1373         die "can't parse option '$line'\n"
1374     }
1375
1376     return ($opt, $value);
1377 }
1378
1379 sub parse_vm_fw_rules {
1380     my ($filename, $fh) = @_;
1381
1382     my $res = { rules => [], options => {}};
1383
1384     my $section;
1385
1386     while (defined(my $line = <$fh>)) {
1387         next if $line =~ m/^#/;
1388         next if $line =~ m/^\s*$/;
1389
1390         my $linenr = $fh->input_line_number();
1391         my $prefix = "$filename (line $linenr)";
1392
1393         if ($line =~ m/^\[(\S+)\]\s*$/i) {
1394             $section = lc($1);
1395             warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1396             next;
1397         }
1398         if (!$section) {
1399             warn "$prefix: skip line - no section";
1400             next;
1401         }
1402
1403         next if !$res->{$section}; # skip undefined section
1404
1405         if ($section eq 'options') {
1406             eval {
1407                 my ($opt, $value) = parse_vmfw_option($line);
1408                 $res->{options}->{$opt} = $value;
1409             };
1410             warn "$prefix: $@" if $@;
1411             next;
1412         }
1413
1414         my $rules;
1415         eval { $rules = parse_fw_rule($line, 1, 1); };
1416         if (my $err = $@) {
1417             warn "$prefix: $err";
1418             next;
1419         }
1420
1421         push @{$res->{$section}}, @$rules;
1422     }
1423
1424     return $res;
1425 }
1426
1427 sub parse_host_fw_rules {
1428     my ($filename, $fh) = @_;
1429
1430     my $res = { rules => [], options => {}};
1431
1432     my $section;
1433
1434     while (defined(my $line = <$fh>)) {
1435         next if $line =~ m/^#/;
1436         next if $line =~ m/^\s*$/;
1437
1438         my $linenr = $fh->input_line_number();
1439         my $prefix = "$filename (line $linenr)";
1440
1441         if ($line =~ m/^\[(\S+)\]\s*$/i) {
1442             $section = lc($1);
1443             warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1444             next;
1445         }
1446         if (!$section) {
1447             warn "$prefix: skip line - no section";
1448             next;
1449         }
1450
1451         next if !$res->{$section}; # skip undefined section
1452
1453         if ($section eq 'options') {
1454             eval {
1455                 my ($opt, $value) = parse_hostfw_option($line);
1456                 $res->{options}->{$opt} = $value;
1457             };
1458             warn "$prefix: $@" if $@;
1459             next;
1460         }
1461
1462         my $rules;
1463         eval { $rules = parse_fw_rule($line, 1, 1); };
1464         if (my $err = $@) {
1465             warn "$prefix: $err";
1466             next;
1467         }
1468
1469         push @{$res->{$section}}, @$rules;
1470     }
1471
1472     return $res;
1473 }
1474
1475 sub parse_group_fw_rules {
1476     my ($filename, $fh) = @_;
1477
1478     my $section;
1479     my $group;
1480
1481     my $res = { rules => [] };
1482
1483     while (defined(my $line = <$fh>)) {
1484         next if $line =~ m/^#/;
1485         next if $line =~ m/^\s*$/;
1486
1487         my $linenr = $fh->input_line_number();
1488         my $prefix = "$filename (line $linenr)";
1489
1490         if ($line =~ m/^\[group\s+(\S+)\]\s*$/i) {
1491             $section = 'rules';
1492             $group = lc($1);
1493             next;
1494         }
1495         if (!$section || !$group) {
1496             warn "$prefix: skip line - no section";
1497             next;
1498         }
1499
1500         my $rules;
1501         eval { $rules = parse_fw_rule($line, 0, 0); };
1502         if (my $err = $@) {
1503             warn "$prefix: $err";
1504             next;
1505         }
1506
1507         push @{$res->{$group}->{$section}}, @$rules;
1508     }
1509
1510     return $res;
1511 }
1512
1513 sub run_locked {
1514     my ($code, @param) = @_;
1515
1516     my $timeout = 10;
1517
1518     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
1519
1520     die $@ if $@;
1521
1522     return $res;
1523 }
1524
1525 sub read_local_vm_config {
1526
1527     my $openvz = {};
1528     my $qemu = {};
1529
1530     my $vmdata = { openvz => $openvz, qemu => $qemu };
1531
1532     my $vmlist = PVE::Cluster::get_vmlist();
1533     return $vmdata if !$vmlist || !$vmlist->{ids};
1534     my $ids = $vmlist->{ids};
1535
1536     foreach my $vmid (keys %$ids) {
1537         next if !$vmid; # skip VE0
1538         my $d = $ids->{$vmid};
1539         next if !$d->{node} || $d->{node} ne $nodename;
1540         next if !$d->{type};
1541         if ($d->{type} eq 'openvz') {
1542             if ($have_pve_manager) {
1543                 my $cfspath = PVE::OpenVZ::cfs_config_path($vmid);
1544                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
1545                     $openvz->{$vmid} = $conf;
1546                 }
1547             }
1548         } elsif ($d->{type} eq 'qemu') {
1549             if ($have_qemu_server) {
1550                 my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
1551                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
1552                     $qemu->{$vmid} = $conf;
1553                 }
1554             }
1555         }
1556     }
1557
1558     return $vmdata;
1559 };
1560
1561 sub read_vm_firewall_configs {
1562     my ($vmdata) = @_;
1563     my $vmfw_configs = {};
1564
1565     foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
1566         my $filename = "/etc/pve/firewall/$vmid.fw";
1567         my $fh = IO::File->new($filename, O_RDONLY);
1568         next if !$fh;
1569
1570         $vmfw_configs->{$vmid} = parse_vm_fw_rules($filename, $fh);
1571     }
1572
1573     return $vmfw_configs;
1574 }
1575
1576 sub get_option_log_level {
1577     my ($options, $k) = @_;
1578
1579     my $v = $options->{$k};
1580     $v = $default_log_level if !defined($v);
1581
1582     return undef if $v eq '' || $v eq 'nolog';
1583
1584     $v = $log_level_hash->{$v} if defined($log_level_hash->{$v});
1585
1586     return $v if ($v >= 0) && ($v <= 7);
1587
1588     warn "unknown log level ($k = '$v')\n";
1589
1590     return undef;
1591 }
1592
1593 sub generate_std_chains {
1594     my ($ruleset, $options) = @_;
1595
1596     my $loglevel = get_option_log_level($options, 'smurf_log_level');
1597
1598     # same as shorewall smurflog.
1599     my $chain = 'PVEFW-smurflog';
1600
1601     push @{$pve_std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
1602     push @{$pve_std_chains->{$chain}}, "-j DROP";
1603
1604     # same as shorewall logflags action.
1605     $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
1606     $chain = 'PVEFW-logflags';
1607     # fixme: is this correctly logged by pvewf-logger? (ther is no --log-ip-options for NFLOG)
1608     push @{$pve_std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
1609     push @{$pve_std_chains->{$chain}}, "-j DROP";
1610
1611     foreach my $chain (keys %$pve_std_chains) {
1612         ruleset_create_chain($ruleset, $chain);
1613         foreach my $rule (@{$pve_std_chains->{$chain}}) {
1614             if (ref($rule)) {
1615                 ruleset_generate_rule($ruleset, $chain, $rule);
1616             } else {
1617                 ruleset_addrule($ruleset, $chain, $rule);
1618             }
1619         }
1620     }
1621 }
1622
1623 sub save_pvefw_status {
1624     my ($status) = @_;
1625
1626     die "unknown status '$status' - internal error"
1627         if $status !~ m/^(stopped|active)$/;
1628
1629     mkdir dirname($pve_fw_status_filename);
1630     PVE::Tools::file_set_contents($pve_fw_status_filename, $status);
1631 }
1632
1633 sub read_pvefw_status {
1634
1635     my $status = 'unknown';
1636
1637     return 'stopped' if ! -f $pve_fw_status_filename;
1638
1639     eval {
1640         $status = PVE::Tools::file_get_contents($pve_fw_status_filename);
1641     };
1642     warn $@ if $@;
1643
1644     return $status;
1645 }
1646
1647 # fixme: move to pve-common PVE::ProcFSTools
1648 sub read_proc_net_route {
1649     my $filename = "/proc/net/route";
1650
1651     my $res = {};
1652
1653     my $fh = IO::File->new ($filename, "r");
1654     return $res if !$fh;
1655
1656     my $int_to_quad = sub {
1657         return join '.' => map { ($_[0] >> 8*(3-$_)) % 256 } (3, 2, 1, 0);
1658     };
1659
1660     while (defined(my $line = <$fh>)) {
1661         next if $line =~/^Iface\s+Destination/; # skip head
1662         my ($iface, $dest, $gateway, $metric, $mask, $mtu) = (split(/\s+/, $line))[0,1,2,6,7,8];
1663         push @{$res->{$iface}}, {
1664             dest => &$int_to_quad(hex($dest)),
1665             gateway => &$int_to_quad(hex($gateway)),
1666             mask => &$int_to_quad(hex($mask)),
1667             metric => $metric,
1668             mtu => $mtu,
1669         };
1670     }
1671
1672     return $res;
1673 }
1674
1675 sub compile {
1676     my $vmdata = read_local_vm_config();
1677     my $vmfw_configs = read_vm_firewall_configs($vmdata);
1678
1679     my $routing_table = read_proc_net_route();
1680
1681     my $groups_conf = {};
1682     my $filename = "/etc/pve/firewall/groups.fw";
1683     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1684         $groups_conf = parse_group_fw_rules($filename, $fh);
1685     }
1686
1687     my $ruleset = {};
1688
1689     ruleset_create_chain($ruleset, "PVEFW-INPUT");
1690     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
1691
1692     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
1693
1694     my $hostfw_options = {};
1695     my $hostfw_conf = {};
1696
1697     $filename = "/etc/pve/local/host.fw";
1698     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1699         $hostfw_conf = parse_host_fw_rules($filename, $fh);
1700         $hostfw_options = $hostfw_conf->{options};
1701     }
1702
1703     generate_std_chains($ruleset, $hostfw_options);
1704
1705     my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
1706
1707     enable_host_firewall($ruleset, $hostfw_conf, $groups_conf) if $hostfw_enable;
1708
1709     # generate firewall rules for QEMU VMs
1710     foreach my $vmid (keys %{$vmdata->{qemu}}) {
1711         my $conf = $vmdata->{qemu}->{$vmid};
1712         my $vmfw_conf = $vmfw_configs->{$vmid};
1713         next if !$vmfw_conf;
1714         next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
1715
1716         foreach my $netid (keys %$conf) {
1717             next if $netid !~ m/^net(\d+)$/;
1718             my $net = PVE::QemuServer::parse_net($conf->{$netid});
1719             next if !$net;
1720             my $iface = "tap${vmid}i$1";
1721
1722             my $bridge = $net->{bridge};
1723             next if !$bridge; # fixme: ?
1724
1725             $bridge .= "v$net->{tag}" if $net->{tag};
1726
1727             generate_bridge_chains($ruleset, $hostfw_conf, $bridge, $routing_table);
1728
1729             my $macaddr = $net->{macaddr};
1730             generate_tap_rules_direction($ruleset, $groups_conf, $iface, $netid, $macaddr,
1731                                          $vmfw_conf, $vmid, $bridge, 'IN');
1732             generate_tap_rules_direction($ruleset, $groups_conf, $iface, $netid, $macaddr,
1733                                          $vmfw_conf, $vmid, $bridge, 'OUT');
1734         }
1735     }
1736
1737     # generate firewall rules for OpenVZ containers
1738     foreach my $vmid (keys %{$vmdata->{openvz}}) {
1739         my $conf = $vmdata->{openvz}->{$vmid};
1740
1741         my $vmfw_conf = $vmfw_configs->{$vmid};
1742         next if !$vmfw_conf;
1743         next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
1744
1745         if ($conf->{ip_address} && $conf->{ip_address}->{value}) {
1746             my $ip = $conf->{ip_address}->{value};
1747             generate_venet_rules_direction($ruleset, $groups_conf, $vmfw_conf, $vmid, $ip, 'IN');
1748             generate_venet_rules_direction($ruleset, $groups_conf, $vmfw_conf, $vmid, $ip, 'OUT');
1749         }
1750
1751         if ($conf->{netif} && $conf->{netif}->{value}) {
1752             my $netif = PVE::OpenVZ::parse_netif($conf->{netif}->{value});
1753             foreach my $netid (keys %$netif) {
1754                 my $d = $netif->{$netid};
1755                 my $bridge = $d->{bridge};
1756                 if (!$bridge) {
1757                     warn "no bridge device for CT $vmid iface '$netid'\n";
1758                     next; # fixme?
1759                 }
1760
1761                 generate_bridge_chains($ruleset, $hostfw_conf, $bridge, $routing_table);
1762
1763                 my $macaddr = $d->{mac};
1764                 my $iface = $d->{host_ifname};
1765                 generate_tap_rules_direction($ruleset, $groups_conf, $iface, $netid, $macaddr,
1766                                              $vmfw_conf, $vmid, $bridge, 'IN');
1767                 generate_tap_rules_direction($ruleset, $groups_conf, $iface, $netid, $macaddr,
1768                                              $vmfw_conf, $vmid, $bridge, 'OUT');
1769             }
1770         }
1771     }
1772
1773     # fixme: this is an optimization? if so, we should also drop INVALID packages?
1774     ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
1775
1776     # fixme: what log level should we use here?
1777     my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
1778
1779     # fixme: should we really block inter-bridge traffic?
1780
1781     # always allow traffic from containers?
1782     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i venet0 -j RETURN");
1783
1784     # disable interbridge routing
1785     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o vmbr+ -j PVEFW-Drop");
1786     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i vmbr+ -j PVEFW-Drop");
1787     ruleset_addlog($ruleset, "PVEFW-FORWARD", 0, "DROP: ", $loglevel, "-o vmbr+");
1788     ruleset_addlog($ruleset, "PVEFW-FORWARD", 0, "DROP: ", $loglevel, "-i vmbr+");
1789     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o vmbr+ -j DROP");
1790     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i vmbr+ -j DROP");
1791
1792     return wantarray ? ($ruleset, $hostfw_conf) : $ruleset;
1793 }
1794
1795 sub get_ruleset_status {
1796     my ($ruleset, $verbose) = @_;
1797
1798     my $active_chains = iptables_get_chains();
1799
1800     my $statushash = {};
1801
1802     foreach my $chain (sort keys %$ruleset) {
1803         my $digest = Digest::SHA->new('sha1');
1804         foreach my $cmd (@{$ruleset->{$chain}}) {
1805              $digest->add("$cmd\n");
1806         }
1807         my $sig = $digest->b64digest;
1808         $statushash->{$chain}->{sig} = $sig;
1809
1810         my $oldsig = $active_chains->{$chain};
1811         if (!defined($oldsig)) {
1812             $statushash->{$chain}->{action} = 'create';
1813         } else {
1814             if ($oldsig eq $sig) {
1815                 $statushash->{$chain}->{action} = 'exists';
1816             } else {
1817                 $statushash->{$chain}->{action} = 'update';
1818             }
1819         }
1820         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
1821         foreach my $cmd (@{$ruleset->{$chain}}) {
1822             print "\t$cmd\n" if $verbose;
1823         }
1824     }
1825
1826     foreach my $chain (sort keys %$active_chains) {
1827         if (!defined($ruleset->{$chain})) {
1828             my $sig = $active_chains->{$chain};
1829             $statushash->{$chain}->{action} = 'delete';
1830             $statushash->{$chain}->{sig} = $sig;
1831             print "delete $chain ($sig)\n" if $verbose;
1832         }
1833     }
1834
1835     return $statushash;
1836 }
1837
1838 sub print_ruleset {
1839     my ($ruleset) = @_;
1840
1841     get_ruleset_status($ruleset, 1);
1842 }
1843
1844 sub print_sig_rule {
1845     my ($chain, $sig) = @_;
1846
1847     # We just use this to store a SHA1 checksum used to detect changes
1848     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
1849 }
1850
1851 sub get_rulset_cmdlist {
1852     my ($ruleset, $verbose) = @_;
1853
1854     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
1855
1856     my $statushash = get_ruleset_status($ruleset, $verbose);
1857
1858     # create missing chains first
1859     foreach my $chain (sort keys %$ruleset) {
1860         my $stat = $statushash->{$chain};
1861         die "internal error" if !$stat;
1862         next if $stat->{action} ne 'create';
1863
1864         $cmdlist .= ":$chain - [0:0]\n";
1865     }
1866
1867     my $rule = "INPUT -j PVEFW-INPUT";
1868     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1869         $cmdlist .= "-A $rule\n";
1870     }
1871     $rule = "OUTPUT -j PVEFW-OUTPUT";
1872     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1873         $cmdlist .= "-A $rule\n";
1874     }
1875
1876     $rule = "FORWARD -j PVEFW-FORWARD";
1877     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1878         $cmdlist .= "-A $rule\n";
1879     }
1880
1881     foreach my $chain (sort keys %$ruleset) {
1882         my $stat = $statushash->{$chain};
1883         die "internal error" if !$stat;
1884
1885         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
1886             $cmdlist .= "-F $chain\n";
1887             foreach my $cmd (@{$ruleset->{$chain}}) {
1888                 $cmdlist .= "$cmd\n";
1889             }
1890             $cmdlist .= print_sig_rule($chain, $stat->{sig});
1891         } elsif ($stat->{action} eq 'delete') {
1892             die "internal error"; # this should not happen
1893         } elsif ($stat->{action} eq 'exists') {
1894             # do nothing
1895         } else {
1896             die "internal error - unknown status '$stat->{action}'";
1897         }
1898     }
1899
1900     foreach my $chain (keys %$statushash) {
1901         next if $statushash->{$chain}->{action} ne 'delete';
1902         $cmdlist .= "-F $chain\n";
1903     }
1904     foreach my $chain (keys %$statushash) {
1905         next if $statushash->{$chain}->{action} ne 'delete';
1906         next if $chain eq 'PVEFW-INPUT';
1907         next if $chain eq 'PVEFW-OUTPUT';
1908         next if $chain eq 'PVEFW-FORWARD';
1909         $cmdlist .= "-X $chain\n";
1910     }
1911
1912     $cmdlist .= "COMMIT\n";
1913
1914     return $cmdlist;
1915 }
1916
1917 sub apply_ruleset {
1918     my ($ruleset, $hostfw_conf, $verbose) = @_;
1919
1920     enable_bridge_firewall();
1921
1922     update_nf_conntrack_max($hostfw_conf);
1923
1924     my $cmdlist = get_rulset_cmdlist($ruleset, $verbose);
1925
1926     print $cmdlist if $verbose;
1927
1928     iptables_restore_cmdlist($cmdlist);
1929
1930     # test: re-read status and check if everything is up to date
1931     my $statushash = get_ruleset_status($ruleset);
1932
1933     my $errors;
1934     foreach my $chain (sort keys %$ruleset) {
1935         my $stat = $statushash->{$chain};
1936         if ($stat->{action} ne 'exists') {
1937             warn "unable to update chain '$chain'\n";
1938             $errors = 1;
1939         }
1940     }
1941
1942     die "unable to apply firewall changes\n" if $errors;
1943 }
1944
1945 sub update_nf_conntrack_max {
1946     my ($hostfw_conf) = @_;
1947
1948     my $max = 65536; # reasonable default
1949
1950     my $options = $hostfw_conf->{options} || {};
1951
1952     if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
1953         $max = $options->{nf_conntrack_max};
1954         $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
1955     }
1956
1957     my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
1958     my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
1959
1960     my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
1961
1962     if ($current != $max) {
1963         my $hashsize = int($max/4);
1964         PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
1965         PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
1966     }
1967 }
1968
1969 sub update {
1970     my ($start, $verbose) = @_;
1971
1972     my $code = sub {
1973         my $status = read_pvefw_status();
1974
1975         my ($ruleset, $hostfw_conf) = PVE::Firewall::compile();
1976
1977         if ($start || $status eq 'active') {
1978
1979             save_pvefw_status('active') if ($status ne 'active');
1980
1981             apply_ruleset($ruleset, $hostfw_conf, $verbose);
1982         } else {
1983             print "Firewall not active (status = $status)\n" if $verbose;
1984         }
1985     };
1986
1987     run_locked($code);
1988 }
1989
1990
1991 1;