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