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