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