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. (fixme: enable/disable logging)
 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     'PVEFW-smurflog' => [
 435         # same as shorewall smurflog. (fixme: enable/disable logging)
 436         "-j LOG --log-prefix \"smurfs-dropped\" --log-level 4",
 437         "-j DROP",
 438     ],
 439     'PVEFW-smurfs' => [
 440         # same as shorewall smurfs action
 441         # Filter packets for smurfs (packets with a broadcast address as the source).
 442         "-s 0.0.0.0/32 -j RETURN",
 443         "-m addrtype --src-type BROADCAST -g PVEFW-smurflog",
 444         "-s 224.0.0.0/4 -g PVEFW-smurflog",
 445     ],
 446 };
 447
 448 # iptables -p icmp -h
 449 my $icmp_type_names = {
 450     any => 1,
 451     'echo-reply' => 1,
 452     'destination-unreachable' => 1,
 453     'network-unreachable' => 1,
 454     'host-unreachable' => 1,
 455     'protocol-unreachable' => 1,
 456     'port-unreachable' => 1,
 457     'fragmentation-needed' => 1,
 458     'source-route-failed' => 1,
 459     'network-unknown' => 1,
 460     'host-unknown' => 1,
 461     'network-prohibited' => 1,
 462     'host-prohibited' => 1,
 463     'TOS-network-unreachable' => 1,
 464     'TOS-host-unreachable' => 1,
 465     'communication-prohibited' => 1,
 466     'host-precedence-violation' => 1,
 467     'precedence-cutoff' => 1,
 468     'source-quench' => 1,
 469     'redirect' => 1,
 470     'network-redirect' => 1,
 471     'host-redirect' => 1,
 472     'TOS-network-redirect' => 1,
 473     'TOS-host-redirect' => 1,
 474     'echo-request' => 1,
 475     'router-advertisement' => 1,
 476     'router-solicitation' => 1,
 477     'time-exceeded' => 1,
 478     'ttl-zero-during-transit' => 1,
 479     'ttl-zero-during-reassembly' => 1,
 480     'parameter-problem' => 1,
 481     'ip-header-bad' => 1,
 482     'required-option-missing' => 1,
 483     'timestamp-request' => 1,
 484     'timestamp-reply' => 1,
 485     'address-mask-request' => 1,
 486     'address-mask-reply' => 1,
 487 };
 488
 489 sub get_firewall_macros {
 490
 491     return $pve_fw_parsed_macros if $pve_fw_parsed_macros;
 492
 493     $pve_fw_parsed_macros = {};
 494
 495     foreach my $k (keys %$pve_fw_macros) {
 496         my $name = lc($k);
 497
 498         my $macro =  $pve_fw_macros->{$k};
 499         $pve_fw_preferred_macro_names->{$name} = $k;
 500         $pve_fw_parsed_macros->{$name} = $macro;
 501     }
 502
 503     return $pve_fw_parsed_macros;
 504 }
 505
 506 my $etc_services;
 507
 508 sub get_etc_services {
 509
 510     return $etc_services if $etc_services;
 511
 512     my $filename = "/etc/services";
 513
 514     my $fh = IO::File->new($filename, O_RDONLY);
 515     if (!$fh) {
 516         warn "unable to read '$filename' - $!\n";
 517         return {};
 518     }
 519
 520     my $services = {};
 521
 522     while (my $line = <$fh>) {
 523         chomp ($line);
 524         next if $line =~m/^#/;
 525         next if ($line =~m/^\s*$/);
 526
 527         if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp).*$!) {
 528             $services->{byid}->{$2}->{name} = $1;
 529             $services->{byid}->{$2}->{port} = $2;
 530             $services->{byid}->{$2}->{$3} = 1;
 531             $services->{byname}->{$1} = $services->{byid}->{$2};
 532         }
 533     }
 534
 535     close($fh);
 536
 537     $etc_services = $services;
 538
 539
 540     return $etc_services;
 541 }
 542
 543 my $etc_protocols;
 544
 545 sub get_etc_protocols {
 546     return $etc_protocols if $etc_protocols;
 547
 548     my $filename = "/etc/protocols";
 549
 550     my $fh = IO::File->new($filename, O_RDONLY);
 551     if (!$fh) {
 552         warn "unable to read '$filename' - $!\n";
 553         return {};
 554     }
 555
 556     my $protocols = {};
 557
 558     while (my $line = <$fh>) {
 559         chomp ($line);
 560         next if $line =~m/^#/;
 561         next if ($line =~m/^\s*$/);
 562
 563         if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
 564             $protocols->{byid}->{$2}->{name} = $1;
 565             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
 566         }
 567     }
 568
 569     close($fh);
 570
 571     $etc_protocols = $protocols;
 572
 573     return $etc_protocols;
 574 }
 575
 576 sub parse_address_list {
 577     my ($str) = @_;
 578
 579     my $nbaor = 0;
 580     foreach my $aor (split(/,/, $str)) {
 581         if (!Net::IP->new($aor)) {
 582             my $err = Net::IP::Error();
 583             die "invalid IP address: $err\n";
 584         }else{
 585             $nbaor++;
 586         }
 587     }
 588     return $nbaor;
 589 }
 590
 591 sub parse_port_name_number_or_range {
 592     my ($str) = @_;
 593
 594     my $services = PVE::Firewall::get_etc_services();
 595     my $nbports = 0;
 596     foreach my $item (split(/,/, $str)) {
 597         my $portlist = "";
 598         my $oldpon = undef;
 599         $nbports++;
 600         foreach my $pon (split(':', $item, 2)) {
 601             $pon = $services->{byname}->{$pon}->{port} if $services->{byname}->{$pon}->{port};
 602             if ($pon =~ m/^\d+$/){
 603                 die "invalid port '$pon'\n" if $pon < 0 && $pon > 65535;
 604                 die "port '$pon' must be bigger than port '$oldpon' \n" if $oldpon && ($pon < $oldpon);
 605                 $oldpon = $pon;
 606             }else{
 607                 die "invalid port $services->{byname}->{$pon}\n" if !$services->{byname}->{$pon};
 608             }
 609         }
 610     }
 611
 612     return ($nbports);
 613 }
 614
 615 my $bridge_firewall_enabled = 0;
 616
 617 sub enable_bridge_firewall {
 618
 619     return if $bridge_firewall_enabled; # only once
 620
 621     system("echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables");
 622     system("echo 1 > /proc/sys/net/bridge/bridge-nf-call-ip6tables");
 623
 624     $bridge_firewall_enabled = 1;
 625 }
 626
 627 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
 628
 629 sub iptables {
 630     my ($cmd) = @_;
 631
 632     run_command("/sbin/iptables $cmd", outfunc => sub {}, errfunc => sub {});
 633 }
 634
 635 sub iptables_restore_cmdlist {
 636     my ($cmdlist) = @_;
 637
 638     run_command("/sbin/iptables-restore -n", input => $cmdlist);
 639 }
 640
 641 sub iptables_get_chains {
 642
 643     my $res = {};
 644
 645     # check what chains we want to track
 646     my $is_pvefw_chain = sub {
 647         my $name = shift;
 648
 649         return 1 if $name =~ m/^PVEFW-\S+$/;
 650
 651         return 1 if $name =~ m/^tap\d+i\d+-(:?IN|OUT)$/;
 652         return 1 if $name =~ m/^vmbr\d+-(:?FW|IN|OUT)$/;
 653         return 1 if $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/;
 654
 655         return undef;
 656     };
 657
 658     my $table = '';
 659
 660     my $parser = sub {
 661         my $line = shift;
 662
 663         return if $line =~ m/^#/;
 664         return if $line =~ m/^\s*$/;
 665
 666         if ($line =~ m/^\*(\S+)$/) {
 667             $table = $1;
 668             return;
 669         }
 670
 671         return if $table ne 'filter';
 672
 673         if ($line =~ m/^:(\S+)\s/) {
 674             my $chain = $1;
 675             return if !&$is_pvefw_chain($chain);
 676             $res->{$chain} = "unknown";
 677         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
 678             my ($chain, $sig) = ($1, $2);
 679             return if !&$is_pvefw_chain($chain);
 680             $res->{$chain} = $sig;
 681         } else {
 682             # simply ignore the rest
 683             return;
 684         }
 685     };
 686
 687     run_command("/sbin/iptables-save", outfunc => $parser);
 688
 689     return $res;
 690 }
 691
 692 sub iptables_chain_exist {
 693     my ($chain) = @_;
 694
 695     eval{
 696         iptables("-n --list $chain");
 697     };
 698     return undef if $@;
 699
 700     return 1;
 701 }
 702
 703 sub iptables_rule_exist {
 704     my ($rule) = @_;
 705
 706     eval{
 707         iptables("-C $rule");
 708     };
 709     return undef if $@;
 710
 711     return 1;
 712 }
 713
 714 sub ruleset_generate_rule {
 715     my ($ruleset, $chain, $rule, $goto) = @_;
 716
 717     my $cmd = '';
 718
 719     $cmd .= " -m iprange --src-range" if $rule->{nbsource} && $rule->{nbsource} > 1;
 720     $cmd .= " -s $rule->{source}" if $rule->{source};
 721     $cmd .= " -m iprange --dst-range" if $rule->{nbdest} && $rule->{nbdest} > 1;
 722     $cmd .= " -d $rule->{dest}" if $rule->{dest};
 723     $cmd .= " -p $rule->{proto}" if $rule->{proto};
 724
 725     if (($rule->{nbdport} && $rule->{nbdport} > 1) ||
 726         ($rule->{nbsport} && $rule->{nbsport} > 1)) {
 727         $cmd .= " --match multiport"
 728     }
 729
 730     if ($rule->{dport}) {
 731         if ($rule->{proto} && $rule->{proto} eq 'icmp') {
 732             # Note: we use dport to store --icmp-type
 733             die "unknown icmp-type\n" if !$icmp_type_names->{$rule->{dport}};
 734             $cmd .= " -m icmp --icmp-type $rule->{dport}";
 735         } else {
 736             if ($rule->{nbdport} && $rule->{nbdport} > 1) {
 737                 $cmd .= " --dports $rule->{dport}";
 738             } else {
 739                 $cmd .= " --dport $rule->{dport}";
 740             }
 741         }
 742     }
 743
 744     if ($rule->{sport}) {
 745         if ($rule->{nbsport} && $rule->{nbsport} > 1) {
 746             $cmd .= " --sports $rule->{sport}";
 747         } else {
 748             $cmd .= " --sport $rule->{sport}";
 749         }
 750     }
 751
 752     $cmd .= " -m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
 753
 754     if (my $action = $rule->{action}) {
 755         $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
 756         $cmd .= $goto ? " -g $action" : " -j $action";
 757     };
 758
 759     ruleset_addrule($ruleset, $chain, $cmd) if $cmd;
 760 }
 761
 762 sub ruleset_create_chain {
 763     my ($ruleset, $chain) = @_;
 764
 765     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
 766
 767     die "chain '$chain' already exists\n" if $ruleset->{$chain};
 768
 769     $ruleset->{$chain} = [];
 770 }
 771
 772 sub ruleset_chain_exist {
 773     my ($ruleset, $chain) = @_;
 774
 775     return $ruleset->{$chain} ? 1 : undef;
 776 }
 777
 778 sub ruleset_addrule {
 779    my ($ruleset, $chain, $rule) = @_;
 780
 781    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 782
 783    push @{$ruleset->{$chain}}, "-A $chain $rule";
 784 }
 785
 786 sub ruleset_insertrule {
 787    my ($ruleset, $chain, $rule) = @_;
 788
 789    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 790
 791    unshift @{$ruleset->{$chain}}, "-A $chain $rule";
 792 }
 793
 794 sub generate_bridge_chains {
 795     my ($ruleset, $bridge) = @_;
 796
 797     if (!ruleset_chain_exist($ruleset, "PVEFW-FORWARD")){
 798         ruleset_create_chain($ruleset, "PVEFW-FORWARD");
 799         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 800     }
 801
 802     if (!ruleset_chain_exist($ruleset, "$bridge-FW")) {
 803         ruleset_create_chain($ruleset, "$bridge-FW");
 804         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -m physdev --physdev-is-bridged -j $bridge-FW");
 805         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -m physdev --physdev-is-bridged -j $bridge-FW");
 806         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -j DROP");  # disable interbridge routing
 807         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -j DROP"); # disable interbridge routing
 808     }
 809
 810     if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) {
 811         ruleset_create_chain($ruleset, "$bridge-OUT");
 812         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-in -j $bridge-OUT");
 813     }
 814
 815     if (!ruleset_chain_exist($ruleset, "$bridge-IN")) {
 816         ruleset_create_chain($ruleset, "$bridge-IN");
 817         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-out -j $bridge-IN");
 818         ruleset_addrule($ruleset, "$bridge-FW", "-m mark --mark 1 -j ACCEPT");
 819     }
 820 }
 821
 822 sub generate_tap_rules_direction {
 823     my ($ruleset, $group_rules, $iface, $netid, $macaddr, $vmfw_conf, $bridge, $direction) = @_;
 824
 825     my $rules = $vmfw_conf->{lc($direction)};
 826     my $options = $vmfw_conf->{options};
 827
 828     my $tapchain = "$iface-$direction";
 829
 830     ruleset_create_chain($ruleset, $tapchain);
 831
 832     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
 833         ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
 834     }
 835
 836     if ($options->{tcpflags}) {
 837         ruleset_addrule($ruleset, $tapchain, "-p tcp -j PVEFW-tcpflags");
 838     }
 839
 840     ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate INVALID -j DROP");
 841     ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 842
 843     if ($direction eq 'OUT' && defined($macaddr) &&
 844         !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
 845         ruleset_addrule($ruleset, $tapchain, "-m mac ! --mac-source $macaddr -j DROP");
 846     }
 847
 848
 849     if ($rules) {
 850         foreach my $rule (@$rules) {
 851             next if $rule->{iface} && $rule->{iface} ne $netid;
 852             # we go to $bridge-IN if accept in out rules
 853             if($rule->{action}  =~ m/^(GROUP-(\S+))$/){
 854                 $rule->{action} .= "-$direction";
 855                 # generate empty group rule if don't exist
 856                 if(!ruleset_chain_exist($ruleset, $rule->{action})){
 857                     generate_group_rules($ruleset, $group_rules, $2);
 858                 }
 859                 ruleset_generate_rule($ruleset, $tapchain, $rule);
 860                 ruleset_addrule($ruleset, $tapchain, "-m mark --mark 1 -j RETURN")
 861                     if $direction eq 'OUT';
 862             } else {
 863                 $rule->{action} = "PVEFW-SET-ACCEPT-MARK" if $rule->{action} eq 'ACCEPT' && $direction eq 'OUT';
 864                 ruleset_generate_rule($ruleset, $tapchain, $rule);
 865             }
 866         }
 867     }
 868
 869     # implement policy
 870     my $policy;
 871
 872     if ($direction eq 'OUT') {
 873         $policy = $options->{'policy-out'} || 'ACCEPT'; # allow everything by default
 874     } else {
 875         $policy = $options->{'policy-in'} || 'DROP'; # allow everything by default
 876     }
 877
 878     if ($policy eq 'ACCEPT') {
 879         if ($direction eq 'OUT') {
 880             ruleset_addrule($ruleset, $tapchain, "-g PVEFW-SET-ACCEPT-MARK");
 881         } else {
 882             ruleset_addrule($ruleset, $tapchain, "-j ACCEPT");
 883         }
 884     } elsif ($policy eq 'DROP') {
 885         ruleset_addrule($ruleset, $tapchain, "-j PVEFW-Drop");
 886         ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-dropped: \" --log-level 4");
 887         ruleset_addrule($ruleset, $tapchain, "-j DROP");
 888     } elsif ($policy eq 'REJECT') {
 889         ruleset_addrule($ruleset, $tapchain, "-j PVEFW-Reject");
 890         ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-reject: \" --log-level 4");
 891         ruleset_addrule($ruleset, $tapchain, "-g PVEFW-reject");
 892     } else {
 893         # should not happen
 894         die "internal error: unknown policy '$policy'";
 895     }
 896
 897     # plug the tap chain to bridge chain
 898     my $physdevdirection = $direction eq 'IN' ? "out" : "in";
 899     my $rule = "-m physdev --physdev-$physdevdirection $iface --physdev-is-bridged -j $tapchain";
 900     ruleset_insertrule($ruleset, "$bridge-$direction", $rule);
 901
 902     if ($direction eq 'OUT'){
 903         # add tap->host rules
 904         my $rule = "-m physdev --physdev-$physdevdirection $iface -j $tapchain";
 905         ruleset_addrule($ruleset, "PVEFW-INPUT", $rule);
 906     }
 907 }
 908
 909 sub enablehostfw {
 910     my ($ruleset, $rules, $group_rules) = @_;
 911
 912     # fixme: allow security groups
 913
 914     # host inbound firewall
 915     my $chain = "PVEFW-HOST-IN";
 916     ruleset_create_chain($ruleset, $chain);
 917
 918     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
 919     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 920     ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
 921     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 922     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW -m multiport --dports 5404,5405 -j ACCEPT");
 923     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT");  #corosync
 924
 925     if ($rules->{in}) {
 926         foreach my $rule (@{$rules->{in}}) {
 927             # we use RETURN because we need to check also tap rules
 928             $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT';
 929             ruleset_generate_rule($ruleset, $chain, $rule);
 930         }
 931     }
 932
 933     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-IN dropped: \" --log-level 4");
 934     ruleset_addrule($ruleset, $chain, "-j DROP");
 935
 936     # host outbound firewall
 937     $chain = "PVEFW-HOST-OUT";
 938     ruleset_create_chain($ruleset, $chain);
 939
 940     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
 941     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 942     ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
 943     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 944     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW -m multiport --dports 5404,5405 -j ACCEPT");
 945     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
 946
 947     if ($rules->{out}) {
 948         foreach my $rule (@{$rules->{out}}) {
 949             # we use RETURN because we need to check also tap rules
 950             $rule->{action} = 'RETURN' if $rule->{action} eq 'ACCEPT';
 951             ruleset_generate_rule($ruleset, $chain, $rule);
 952         }
 953     }
 954
 955     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-OUT dropped: \" --log-level 4");
 956     ruleset_addrule($ruleset, $chain, "-j DROP");
 957
 958     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
 959     ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
 960 }
 961
 962 sub generate_group_rules {
 963     my ($ruleset, $group_rules, $group) = @_;
 964
 965     my $rules = $group_rules->{$group};
 966
 967     die "no such security group '$group'\n" if !$rules;
 968
 969     my $chain = "GROUP-${group}-IN";
 970
 971     ruleset_create_chain($ruleset, $chain);
 972
 973     if ($rules->{in}) {
 974         foreach my $rule (@{$rules->{in}}) {
 975             ruleset_generate_rule($ruleset, $chain, $rule);
 976         }
 977     }
 978
 979     $chain = "GROUP-${group}-OUT";
 980
 981     ruleset_create_chain($ruleset, $chain);
 982     ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
 983
 984     if ($rules->{out}) {
 985         foreach my $rule (@{$rules->{out}}) {
 986             # we go the PVEFW-SET-ACCEPT-MARK Instead of ACCEPT) because we need to
 987             # check also other tap rules (and group rules can be set on any bridge,
 988             # so we can't go to VMBRXX-IN)
 989             $rule->{action} = 'PVEFW-SET-ACCEPT-MARK' if $rule->{action} eq 'ACCEPT';
 990             ruleset_generate_rule($ruleset, $chain, $rule);
 991         }
 992     }
 993 }
 994
 995 my $MAX_NETS = 32;
 996 my $valid_netdev_names = {};
 997 for (my $i = 0; $i < $MAX_NETS; $i++)  {
 998     $valid_netdev_names->{"net$i"} = 1;
 999 }
1000
1001 sub parse_fw_rule {
1002     my ($line, $need_iface, $allow_groups) = @_;
1003
1004     my $macros = get_firewall_macros();
1005     my $protocols = get_etc_protocols();
1006
1007     my ($action, $iface, $source, $dest, $proto, $dport, $sport);
1008
1009     $line =~ s/#.*$//;
1010
1011     my @data = split(/\s+/, $line);
1012     my $expected_elements = $need_iface ? 7 : 6;
1013
1014     die "wrong number of rule elements\n" if scalar(@data) > $expected_elements;
1015
1016     if ($need_iface) {
1017         ($action, $iface, $source, $dest, $proto, $dport, $sport) = @data
1018     } else {
1019         ($action, $source, $dest, $proto, $dport, $sport) =  @data;
1020     }
1021
1022     die "incomplete rule\n" if !$action;
1023
1024     my $macro;
1025     my $macro_name;
1026
1027     if ($action =~ m/^(ACCEPT|DROP|REJECT)$/) {
1028         # OK
1029     } elsif ($allow_groups && $action =~ m/^GROUP-(:?\S+)$/) {
1030         # OK
1031     } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
1032         ($macro_name, $action) = ($1, $2);
1033         my $lc_macro_name = lc($macro_name);
1034         my $preferred_name = $pve_fw_preferred_macro_names->{$lc_macro_name};
1035         $macro_name = $preferred_name if $preferred_name;
1036         $macro = $macros->{$lc_macro_name};
1037         die "unknown macro '$macro_name'\n" if !$macro;
1038     } else {
1039         die "unknown action '$action'\n";
1040     }
1041
1042     if ($need_iface) {
1043         $iface = undef if $iface && $iface eq '-';
1044         die "unknown interface '$iface'\n"
1045             if defined($iface) && !$valid_netdev_names->{$iface};
1046     }
1047
1048     $proto = undef if $proto && $proto eq '-';
1049     die "unknown protokol '$proto'\n" if $proto &&
1050         !(defined($protocols->{byname}->{$proto}) ||
1051           defined($protocols->{byid}->{$proto}));
1052
1053     $source = undef if $source && $source eq '-';
1054     $dest = undef if $dest && $dest eq '-';
1055
1056     $dport = undef if $dport && $dport eq '-';
1057     $sport = undef if $sport && $sport eq '-';
1058
1059     my $nbsource = undef;
1060     my $nbdest = undef;
1061
1062     $nbsource = parse_address_list($source) if $source;
1063     $nbdest = parse_address_list($dest) if $dest;
1064
1065     my $rules = [];
1066
1067     my $param = {
1068         action => $action,
1069         iface => $iface,
1070         source => $source,
1071         dest => $dest,
1072         nbsource => $nbsource,
1073         nbdest => $nbdest,
1074         proto => $proto,
1075         dport => $dport,
1076         sport => $sport,
1077     };
1078
1079     if ($macro) {
1080         foreach my $templ (@$macro) {
1081             my $rule = {};
1082             foreach my $k (keys %$templ) {
1083                 my $v = $templ->{$k};
1084                 if ($v eq 'PARAM') {
1085                     $v = $param->{$k};
1086                 } elsif ($v eq 'DEST') {
1087                     $v = $param->{dest};
1088                 } elsif ($v eq 'SOURCE') {
1089                     $v = $param->{source};
1090                 }
1091
1092                 die "missing parameter '$k' in macro '$macro_name'\n" if !defined($v);
1093                 $rule->{$k} = $v;
1094             }
1095             push @$rules, $rule;
1096         }
1097     } else {
1098         push @$rules, $param;
1099     }
1100
1101     foreach my $rule (@$rules) {
1102         $rule->{nbdport} = parse_port_name_number_or_range($rule->{dport})
1103             if defined($rule->{dport});
1104         $rule->{nbsport} = parse_port_name_number_or_range($rule->{sport})
1105             if defined($rule->{sport});
1106     }
1107
1108     return $rules;
1109 }
1110
1111 sub parse_fw_option {
1112     my ($line) = @_;
1113
1114     my ($opt, $value);
1115
1116     if ($line =~ m/^(enable|macfilter|nosmurfs|tcpflags):\s*(0|1)\s*$/i) {
1117         $opt = lc($1);
1118         $value = int($2);
1119     } elsif ($line =~ m/^(policy-(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1120         $opt = lc($1);
1121         $value = uc($3);
1122     } else {
1123         chomp $line;
1124         die "can't parse option '$line'\n"
1125     }
1126
1127     return ($opt, $value);
1128 }
1129
1130 sub parse_vm_fw_rules {
1131     my ($filename, $fh) = @_;
1132
1133     my $res = { in => [], out => [], options => {}};
1134
1135     my $section;
1136
1137     while (defined(my $line = <$fh>)) {
1138         next if $line =~ m/^#/;
1139         next if $line =~ m/^\s*$/;
1140
1141         my $linenr = $fh->input_line_number();
1142         my $prefix = "$filename (line $linenr)";
1143
1144         if ($line =~ m/^\[(\S+)\]\s*$/i) {
1145             $section = lc($1);
1146             warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1147             next;
1148         }
1149         if (!$section) {
1150             warn "$prefix: skip line - no section";
1151             next;
1152         }
1153
1154         next if !$res->{$section}; # skip undefined section
1155
1156         if ($section eq 'options') {
1157             eval {
1158                 my ($opt, $value) = parse_fw_option($line);
1159                 $res->{options}->{$opt} = $value;
1160             };
1161             warn "$prefix: $@" if $@;
1162             next;
1163         }
1164
1165         my $rules;
1166         eval { $rules = parse_fw_rule($line, 1, 1); };
1167         if (my $err = $@) {
1168             warn "$prefix: $err";
1169             next;
1170         }
1171
1172         push @{$res->{$section}}, @$rules;
1173     }
1174
1175     return $res;
1176 }
1177
1178 sub parse_host_fw_rules {
1179     my ($filename, $fh) = @_;
1180
1181     my $res = { in => [], out => [] };
1182
1183     my $section;
1184
1185     while (defined(my $line = <$fh>)) {
1186         next if $line =~ m/^#/;
1187         next if $line =~ m/^\s*$/;
1188
1189         my $linenr = $fh->input_line_number();
1190         my $prefix = "$filename (line $linenr)";
1191
1192         if ($line =~ m/^\[(in|out)\]\s*$/i) {
1193             $section = lc($1);
1194             next;
1195         }
1196         if (!$section) {
1197             warn "$prefix: skip line - no section";
1198             next;
1199         }
1200
1201         my $rules;
1202         eval { $rules = parse_fw_rule($line, 1, 1); };
1203         if (my $err = $@) {
1204             warn "$prefix: $err";
1205             next;
1206         }
1207
1208         push @{$res->{$section}}, @$rules;
1209     }
1210
1211     return $res;
1212 }
1213
1214 sub parse_group_fw_rules {
1215     my ($filename, $fh) = @_;
1216
1217     my $section;
1218     my $group;
1219
1220     my $res = { in => [], out => [] };
1221
1222     while (defined(my $line = <$fh>)) {
1223         next if $line =~ m/^#/;
1224         next if $line =~ m/^\s*$/;
1225
1226         my $linenr = $fh->input_line_number();
1227         my $prefix = "$filename (line $linenr)";
1228
1229         if ($line =~ m/^\[(in|out):(\S+)\]\s*$/i) {
1230             $section = lc($1);
1231             $group = lc($2);
1232             next;
1233         }
1234         if (!$section || !$group) {
1235             warn "$prefix: skip line - no section";
1236             next;
1237         }
1238
1239         my $rules;
1240         eval { $rules = parse_fw_rule($line, 0, 0); };
1241         if (my $err = $@) {
1242             warn "$prefix: $err";
1243             next;
1244         }
1245
1246         push @{$res->{$group}->{$section}}, @$rules;
1247     }
1248
1249     return $res;
1250 }
1251
1252 sub run_locked {
1253     my ($code, @param) = @_;
1254
1255     my $timeout = 10;
1256
1257     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
1258
1259     die $@ if $@;
1260
1261     return $res;
1262 }
1263
1264 sub read_local_vm_config {
1265
1266     my $openvz = {};
1267
1268     my $qemu = {};
1269
1270     my $list = PVE::QemuServer::config_list();
1271
1272     foreach my $vmid (keys %$list) {
1273         my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
1274         if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
1275             $qemu->{$vmid} = $conf;
1276         }
1277     }
1278
1279     my $vmdata = { openvz => $openvz, qemu => $qemu };
1280
1281     return $vmdata;
1282 };
1283
1284 sub read_vm_firewall_rules {
1285     my ($vmdata) = @_;
1286     my $rules = {};
1287     foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
1288         my $filename = "/etc/pve/firewall/$vmid.fw";
1289         my $fh = IO::File->new($filename, O_RDONLY);
1290         next if !$fh;
1291
1292         $rules->{$vmid} = parse_vm_fw_rules($filename, $fh);
1293     }
1294
1295     return $rules;
1296 }
1297
1298 sub generate_std_chains {
1299     my ($ruleset) = @_;
1300
1301     foreach my $chain (keys %$pve_std_chains) {
1302         ruleset_create_chain($ruleset, $chain);
1303         foreach my $rule (@{$pve_std_chains->{$chain}}) {
1304             if (ref($rule)) {
1305                 ruleset_generate_rule($ruleset, $chain, $rule);
1306             } else {
1307                 ruleset_addrule($ruleset, $chain, $rule);
1308             }
1309         }
1310     }
1311 }
1312
1313 sub compile {
1314     my $vmdata = read_local_vm_config();
1315     my $rules = read_vm_firewall_rules($vmdata);
1316
1317     my $group_rules = {};
1318     my $filename = "/etc/pve/firewall/groups.fw";
1319     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1320         $group_rules = parse_group_fw_rules($filename, $fh);
1321     }
1322
1323     #print Dumper($rules);
1324
1325     my $ruleset = {};
1326
1327     ruleset_create_chain($ruleset, "PVEFW-INPUT");
1328     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
1329     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
1330
1331     generate_std_chains($ruleset);
1332
1333     my $enable_hostfw = 0;
1334     $filename = "/etc/pve/local/host.fw";
1335     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1336         my $host_rules = parse_host_fw_rules($filename, $fh);
1337
1338         $enable_hostfw = 1;
1339
1340         enablehostfw($ruleset, $host_rules, $group_rules);
1341     }
1342
1343     # generate firewall rules for QEMU VMs
1344     foreach my $vmid (keys %{$vmdata->{qemu}}) {
1345         my $conf = $vmdata->{qemu}->{$vmid};
1346         my $vmfw_conf = $rules->{$vmid};
1347         next if !$vmfw_conf;
1348         next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
1349
1350         foreach my $netid (keys %$conf) {
1351             next if $netid !~ m/^net(\d+)$/;
1352             my $net = PVE::QemuServer::parse_net($conf->{$netid});
1353             next if !$net;
1354             my $iface = "tap${vmid}i$1";
1355
1356             my $bridge = $net->{bridge};
1357             next if !$bridge; # fixme: ?
1358
1359             $bridge .= "v$net->{tag}" if $net->{tag};
1360
1361
1362             generate_bridge_chains($ruleset, $bridge);
1363
1364             my $macaddr = $net->{macaddr};
1365             generate_tap_rules_direction($ruleset, $group_rules, $iface, $netid, $macaddr, $vmfw_conf, $bridge, 'IN');
1366             generate_tap_rules_direction($ruleset, $group_rules, $iface, $netid, $macaddr, $vmfw_conf, $bridge, 'OUT');
1367         }
1368     }
1369
1370     if ($enable_hostfw) {
1371         # allow traffic from lo (ourself)
1372         ruleset_addrule($ruleset, "PVEFW-INPUT", "-i lo -j ACCEPT");
1373     }
1374
1375     return $ruleset;
1376 }
1377
1378 sub get_ruleset_status {
1379     my ($ruleset, $verbose) = @_;
1380
1381     my $active_chains = iptables_get_chains();
1382
1383     my $statushash = {};
1384
1385     foreach my $chain (sort keys %$ruleset) {
1386         my $digest = Digest::SHA->new('sha1');
1387         foreach my $cmd (@{$ruleset->{$chain}}) {
1388              $digest->add("$cmd\n");
1389         }
1390         my $sig = $digest->b64digest;
1391         $statushash->{$chain}->{sig} = $sig;
1392
1393         my $oldsig = $active_chains->{$chain};
1394         if (!defined($oldsig)) {
1395             $statushash->{$chain}->{action} = 'create';
1396         } else {
1397             if ($oldsig eq $sig) {
1398                 $statushash->{$chain}->{action} = 'exists';
1399             } else {
1400                 $statushash->{$chain}->{action} = 'update';
1401             }
1402         }
1403         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
1404         foreach my $cmd (@{$ruleset->{$chain}}) {
1405             print "\t$cmd\n" if $verbose;
1406         }
1407     }
1408
1409     foreach my $chain (sort keys %$active_chains) {
1410         if (!defined($ruleset->{$chain})) {
1411             my $sig = $active_chains->{$chain};
1412             $statushash->{$chain}->{action} = 'delete';
1413             $statushash->{$chain}->{sig} = $sig;
1414             print "delete $chain ($sig)\n" if $verbose;
1415         }
1416     }
1417
1418     return $statushash;
1419 }
1420
1421 sub print_ruleset {
1422     my ($ruleset) = @_;
1423
1424     get_ruleset_status($ruleset, 1);
1425 }
1426
1427 sub print_sig_rule {
1428     my ($chain, $sig) = @_;
1429
1430     # We just use this to store a SHA1 checksum used to detect changes
1431     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
1432 }
1433
1434 sub apply_ruleset {
1435     my ($ruleset, $verbose) = @_;
1436
1437     enable_bridge_firewall();
1438
1439     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
1440
1441     my $statushash = get_ruleset_status($ruleset, $verbose);
1442
1443     # create missing chains first
1444     foreach my $chain (sort keys %$ruleset) {
1445         my $stat = $statushash->{$chain};
1446         die "internal error" if !$stat;
1447         next if $stat->{action} ne 'create';
1448
1449         $cmdlist .= ":$chain - [0:0]\n";
1450     }
1451
1452     my $rule = "INPUT -j PVEFW-INPUT";
1453     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1454         $cmdlist .= "-A $rule\n";
1455     }
1456     $rule = "OUTPUT -j PVEFW-OUTPUT";
1457     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1458         $cmdlist .= "-A $rule\n";
1459     }
1460
1461     $rule = "FORWARD -j PVEFW-FORWARD";
1462     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1463         $cmdlist .= "-A $rule\n";
1464     }
1465
1466     foreach my $chain (sort keys %$ruleset) {
1467         my $stat = $statushash->{$chain};
1468         die "internal error" if !$stat;
1469
1470         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
1471             $cmdlist .= "-F $chain\n";
1472             foreach my $cmd (@{$ruleset->{$chain}}) {
1473                 $cmdlist .= "$cmd\n";
1474             }
1475             $cmdlist .= print_sig_rule($chain, $stat->{sig});
1476         } elsif ($stat->{action} eq 'delete') {
1477             die "internal error"; # this should not happen
1478         } elsif ($stat->{action} eq 'exists') {
1479             # do nothing
1480         } else {
1481             die "internal error - unknown status '$stat->{action}'";
1482         }
1483     }
1484
1485     foreach my $chain (keys %$statushash) {
1486         next if $statushash->{$chain}->{action} ne 'delete';
1487         $cmdlist .= "-F $chain\n";
1488     }
1489     foreach my $chain (keys %$statushash) {
1490         next if $statushash->{$chain}->{action} ne 'delete';
1491         next if $chain eq 'PVEFW-INPUT';
1492         next if $chain eq 'PVEFW-OUTPUT';
1493         next if $chain eq 'PVEFW-FORWARD';
1494         $cmdlist .= "-X $chain\n";
1495     }
1496
1497     $cmdlist .= "COMMIT\n";
1498
1499     print $cmdlist if $verbose;
1500
1501     iptables_restore_cmdlist($cmdlist);
1502
1503     # test: re-read status and check if everything is up to date
1504     $statushash = get_ruleset_status($ruleset);
1505
1506     my $errors;
1507     foreach my $chain (sort keys %$ruleset) {
1508         my $stat = $statushash->{$chain};
1509         if ($stat->{action} ne 'exists') {
1510             warn "unable to update chain '$chain'\n";
1511             $errors = 1;
1512         }
1513     }
1514
1515     die "unable to apply firewall changes\n" if $errors;
1516 }
1517
1518 1;