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 => 'echo-request' },
 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 => 'echo-request' },
 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, $actions, $goto) = @_;
 716
 717     return if $rule->{disable};
 718
 719     my $cmd = '';
 720
 721     $cmd .= " -m iprange --src-range" if $rule->{nbsource} && $rule->{nbsource} > 1;
 722     $cmd .= " -s $rule->{source}" if $rule->{source};
 723     $cmd .= " -m iprange --dst-range" if $rule->{nbdest} && $rule->{nbdest} > 1;
 724     $cmd .= " -d $rule->{dest}" if $rule->{dest};
 725
 726     if ($rule->{proto}) {
 727         $cmd .= " -p $rule->{proto}";
 728
 729         my $multiport = 0;
 730         $multiport++ if $rule->{nbdport} && ($rule->{nbdport} > 1);
 731         $multiport++ if $rule->{nbsport} && ($rule->{nbsport} > 1);
 732
 733         $cmd .= " --match multiport" if $multiport;
 734
 735         die "multiport: option '--sports' cannot be used together with '--dports'\n"
 736             if ($multiport == 2) && ($rule->{dport} ne $rule->{sport});
 737
 738         if ($rule->{dport}) {
 739             if ($rule->{proto} && $rule->{proto} eq 'icmp') {
 740                 # Note: we use dport to store --icmp-type
 741                 die "unknown icmp-type '$rule->{dport}'\n" if !defined($icmp_type_names->{$rule->{dport}});
 742                 $cmd .= " -m icmp --icmp-type $rule->{dport}";
 743             } else {
 744                 if ($rule->{nbdport} && $rule->{nbdport} > 1) {
 745                     if ($multiport == 2) {
 746                         $cmd .= " --ports $rule->{dport}";
 747                     } else {
 748                         $cmd .= " --dports $rule->{dport}";
 749                     }
 750                 } else {
 751                     $cmd .= " --dport $rule->{dport}";
 752                 }
 753             }
 754         }
 755
 756         if ($rule->{sport}) {
 757             if ($rule->{nbsport} && $rule->{nbsport} > 1) {
 758                 $cmd .= " --sports $rule->{sport}" if $multiport != 2;
 759             } else {
 760                 $cmd .= " --sport $rule->{sport}";
 761             }
 762         }
 763     } elsif ($rule->{dport} || $rule->{sport}) {
 764         warn "ignoring destination port '$rule->{dport}' - no protocol specified\n" if $rule->{dport};
 765         warn "ignoring source port '$rule->{sport}' - no protocol specified\n" if $rule->{sport};
 766     }
 767
 768     $cmd .= " -m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
 769
 770     if (my $action = $rule->{action}) {
 771         $action = $actions->{$action} if defined($actions->{$action});
 772         $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
 773         $cmd .= $goto ? " -g $action" : " -j $action";
 774     }
 775
 776     ruleset_addrule($ruleset, $chain, $cmd) if $cmd;
 777 }
 778
 779 sub ruleset_create_chain {
 780     my ($ruleset, $chain) = @_;
 781
 782     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
 783
 784     die "chain '$chain' already exists\n" if $ruleset->{$chain};
 785
 786     $ruleset->{$chain} = [];
 787 }
 788
 789 sub ruleset_chain_exist {
 790     my ($ruleset, $chain) = @_;
 791
 792     return $ruleset->{$chain} ? 1 : undef;
 793 }
 794
 795 sub ruleset_addrule {
 796    my ($ruleset, $chain, $rule) = @_;
 797
 798    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 799
 800    push @{$ruleset->{$chain}}, "-A $chain $rule";
 801 }
 802
 803 sub ruleset_insertrule {
 804    my ($ruleset, $chain, $rule) = @_;
 805
 806    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 807
 808    unshift @{$ruleset->{$chain}}, "-A $chain $rule";
 809 }
 810
 811 sub generate_bridge_chains {
 812     my ($ruleset, $bridge) = @_;
 813
 814     if (!ruleset_chain_exist($ruleset, "PVEFW-FORWARD")){
 815         ruleset_create_chain($ruleset, "PVEFW-FORWARD");
 816         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 817     }
 818
 819     if (!ruleset_chain_exist($ruleset, "$bridge-FW")) {
 820         ruleset_create_chain($ruleset, "$bridge-FW");
 821         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -m physdev --physdev-is-bridged -j $bridge-FW");
 822         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -m physdev --physdev-is-bridged -j $bridge-FW");
 823         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -j DROP");  # disable interbridge routing
 824         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -j DROP"); # disable interbridge routing
 825     }
 826
 827     if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) {
 828         ruleset_create_chain($ruleset, "$bridge-OUT");
 829         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-in -j $bridge-OUT");
 830     }
 831
 832     if (!ruleset_chain_exist($ruleset, "$bridge-IN")) {
 833         ruleset_create_chain($ruleset, "$bridge-IN");
 834         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-out -j $bridge-IN");
 835         ruleset_addrule($ruleset, "$bridge-FW", "-m mark --mark 1 -j ACCEPT");
 836         # accept traffic to unmanaged bridge ports
 837         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-out -j ACCEPT ");
 838     }
 839 }
 840
 841 sub generate_tap_rules_direction {
 842     my ($ruleset, $group_rules, $iface, $netid, $macaddr, $vmfw_conf, $bridge, $direction) = @_;
 843
 844     my $rules = $vmfw_conf->{lc($direction)};
 845     my $options = $vmfw_conf->{options};
 846
 847     my $tapchain = "$iface-$direction";
 848
 849     ruleset_create_chain($ruleset, $tapchain);
 850
 851     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
 852         ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
 853     }
 854
 855     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
 856         ruleset_addrule($ruleset, $tapchain, "-p udp -m udp --dport 67:68 -j ACCEPT");
 857     }
 858
 859     if ($options->{tcpflags}) {
 860         ruleset_addrule($ruleset, $tapchain, "-p tcp -j PVEFW-tcpflags");
 861     }
 862
 863     ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate INVALID -j DROP");
 864     ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 865
 866     if ($direction eq 'OUT' && defined($macaddr) &&
 867         !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
 868         ruleset_addrule($ruleset, $tapchain, "-m mac ! --mac-source $macaddr -j DROP");
 869     }
 870
 871     if ($rules) {
 872         foreach my $rule (@$rules) {
 873             next if $rule->{iface} && $rule->{iface} ne $netid;
 874             # we go to $bridge-IN if accept in out rules
 875             if($rule->{action}  =~ m/^(GROUP-(\S+))$/){
 876                 $rule->{action} .= "-$direction";
 877                 # generate empty group rule if don't exist
 878                 if(!ruleset_chain_exist($ruleset, $rule->{action})){
 879                     generate_group_rules($ruleset, $group_rules, $2);
 880                 }
 881                 ruleset_generate_rule($ruleset, $tapchain, $rule);
 882                 ruleset_addrule($ruleset, $tapchain, "-m mark --mark 1 -j RETURN")
 883                     if $direction eq 'OUT';
 884             } else {
 885                 if ($direction eq 'OUT') {
 886                     ruleset_generate_rule($ruleset, $tapchain, $rule,
 887                                           { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
 888                 } else {
 889                     ruleset_generate_rule($ruleset, $tapchain, $rule, { REJECT => "PVEFW-reject" });
 890                 }
 891             }
 892         }
 893     }
 894
 895     # implement policy
 896     my $policy;
 897
 898     if ($direction eq 'OUT') {
 899         $policy = $options->{'policy-out'} || 'ACCEPT'; # allow everything by default
 900     } else {
 901         $policy = $options->{'policy-in'} || 'DROP'; # allow everything by default
 902     }
 903
 904     if ($policy eq 'ACCEPT') {
 905         if ($direction eq 'OUT') {
 906             ruleset_addrule($ruleset, $tapchain, "-g PVEFW-SET-ACCEPT-MARK");
 907         } else {
 908             ruleset_addrule($ruleset, $tapchain, "-j ACCEPT");
 909         }
 910     } elsif ($policy eq 'DROP') {
 911         ruleset_addrule($ruleset, $tapchain, "-j PVEFW-Drop");
 912         ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-dropped: \" --log-level 4");
 913         ruleset_addrule($ruleset, $tapchain, "-j DROP");
 914     } elsif ($policy eq 'REJECT') {
 915         ruleset_addrule($ruleset, $tapchain, "-j PVEFW-Reject");
 916         ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-reject: \" --log-level 4");
 917         ruleset_addrule($ruleset, $tapchain, "-g PVEFW-reject");
 918     } else {
 919         # should not happen
 920         die "internal error: unknown policy '$policy'";
 921     }
 922
 923     # plug the tap chain to bridge chain
 924     my $physdevdirection = $direction eq 'IN' ? "out" : "in";
 925     my $rule = "-m physdev --physdev-$physdevdirection $iface --physdev-is-bridged -j $tapchain";
 926     ruleset_insertrule($ruleset, "$bridge-$direction", $rule);
 927
 928     if ($direction eq 'OUT'){
 929         # add tap->host rules
 930         my $rule = "-m physdev --physdev-$physdevdirection $iface -j $tapchain";
 931         ruleset_addrule($ruleset, "PVEFW-INPUT", $rule);
 932     }
 933 }
 934
 935 sub enablehostfw {
 936     my ($ruleset, $rules, $group_rules) = @_;
 937
 938     # fixme: allow security groups
 939
 940     # host inbound firewall
 941     my $chain = "PVEFW-HOST-IN";
 942     ruleset_create_chain($ruleset, $chain);
 943
 944     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
 945     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 946     ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
 947     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 948     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW -m multiport --dports 5404,5405 -j ACCEPT");
 949     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT");  #corosync
 950
 951     if ($rules->{in}) {
 952         foreach my $rule (@{$rules->{in}}) {
 953             # we use RETURN because we need to check also tap rules
 954             ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => 'RETURN', REJECT => "PVEFW-reject" });
 955         }
 956     }
 957
 958     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-IN dropped: \" --log-level 4");
 959     ruleset_addrule($ruleset, $chain, "-j DROP");
 960
 961     # host outbound firewall
 962     $chain = "PVEFW-HOST-OUT";
 963     ruleset_create_chain($ruleset, $chain);
 964
 965     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
 966     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 967     ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
 968     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 969     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW -m multiport --dports 5404,5405 -j ACCEPT");
 970     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
 971
 972     if ($rules->{out}) {
 973         foreach my $rule (@{$rules->{out}}) {
 974             # we use RETURN because we need to check also tap rules
 975             ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => 'RETURN', REJECT => "PVEFW-reject" });
 976         }
 977     }
 978
 979     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-OUT dropped: \" --log-level 4");
 980     ruleset_addrule($ruleset, $chain, "-j DROP");
 981
 982     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
 983     ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
 984 }
 985
 986 sub generate_group_rules {
 987     my ($ruleset, $group_rules, $group) = @_;
 988
 989     my $rules = $group_rules->{$group};
 990
 991     die "no such security group '$group'\n" if !$rules;
 992
 993     my $chain = "GROUP-${group}-IN";
 994
 995     ruleset_create_chain($ruleset, $chain);
 996
 997     if ($rules->{in}) {
 998         foreach my $rule (@{$rules->{in}}) {
 999             ruleset_generate_rule($ruleset, $chain, $rule, { REJECT => "PVEFW-reject" });
1000         }
1001     }
1002
1003     $chain = "GROUP-${group}-OUT";
1004
1005     ruleset_create_chain($ruleset, $chain);
1006     ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1007
1008     if ($rules->{out}) {
1009         foreach my $rule (@{$rules->{out}}) {
1010             # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
1011             # check also other tap rules later
1012             ruleset_generate_rule($ruleset, $chain, $rule,
1013                                   { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" });
1014         }
1015     }
1016 }
1017
1018 my $MAX_NETS = 32;
1019 my $valid_netdev_names = {};
1020 for (my $i = 0; $i < $MAX_NETS; $i++)  {
1021     $valid_netdev_names->{"net$i"} = 1;
1022 }
1023
1024 sub parse_fw_rule {
1025     my ($line, $need_iface, $allow_groups) = @_;
1026
1027     my $macros = get_firewall_macros();
1028     my $protocols = get_etc_protocols();
1029
1030     my ($action, $iface, $source, $dest, $proto, $dport, $sport);
1031
1032     # we can add single line comments to the end of the rule
1033     my $comment = $1 if $line =~ s/#\s*(.*?)\s*$//;
1034
1035     # we can disable a rule when prefixed with '|'
1036     my $disable = 1 if  $line =~ s/^\|//;
1037
1038     my @data = split(/\s+/, $line);
1039     my $expected_elements = $need_iface ? 7 : 6;
1040
1041     die "wrong number of rule elements\n" if scalar(@data) > $expected_elements;
1042
1043     if ($need_iface) {
1044         ($action, $iface, $source, $dest, $proto, $dport, $sport) = @data
1045     } else {
1046         ($action, $source, $dest, $proto, $dport, $sport) =  @data;
1047     }
1048
1049     die "incomplete rule\n" if !$action;
1050
1051     my $macro;
1052     my $macro_name;
1053
1054     if ($action =~ m/^(ACCEPT|DROP|REJECT)$/) {
1055         # OK
1056     } elsif ($allow_groups && $action =~ m/^GROUP-(:?\S+)$/) {
1057         # OK
1058     } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
1059         ($macro_name, $action) = ($1, $2);
1060         my $lc_macro_name = lc($macro_name);
1061         my $preferred_name = $pve_fw_preferred_macro_names->{$lc_macro_name};
1062         $macro_name = $preferred_name if $preferred_name;
1063         $macro = $macros->{$lc_macro_name};
1064         die "unknown macro '$macro_name'\n" if !$macro;
1065     } else {
1066         die "unknown action '$action'\n";
1067     }
1068
1069     if ($need_iface) {
1070         $iface = undef if $iface && $iface eq '-';
1071         die "unknown interface '$iface'\n"
1072             if defined($iface) && !$valid_netdev_names->{$iface};
1073     }
1074
1075     $proto = undef if $proto && $proto eq '-';
1076     die "unknown protokol '$proto'\n" if $proto &&
1077         !(defined($protocols->{byname}->{$proto}) ||
1078           defined($protocols->{byid}->{$proto}));
1079
1080     $source = undef if $source && $source eq '-';
1081     $dest = undef if $dest && $dest eq '-';
1082
1083     $dport = undef if $dport && $dport eq '-';
1084     $sport = undef if $sport && $sport eq '-';
1085
1086     my $nbsource = undef;
1087     my $nbdest = undef;
1088
1089     $nbsource = parse_address_list($source) if $source;
1090     $nbdest = parse_address_list($dest) if $dest;
1091
1092     my $rules = [];
1093
1094     my $param = {
1095         disable => $disable,
1096         comment => $comment,
1097         action => $action,
1098         iface => $iface,
1099         source => $source,
1100         dest => $dest,
1101         nbsource => $nbsource,
1102         nbdest => $nbdest,
1103         proto => $proto,
1104         dport => $dport,
1105         sport => $sport,
1106     };
1107
1108     if ($macro) {
1109         foreach my $templ (@$macro) {
1110             my $rule = {};
1111             my $param_used = {};
1112             foreach my $k (keys %$templ) {
1113                 my $v = $templ->{$k};
1114                 if ($v eq 'PARAM') {
1115                     $v = $param->{$k};
1116                     $param_used->{$k} = 1;
1117                 } elsif ($v eq 'DEST') {
1118                     $v = $param->{dest};
1119                     $param_used->{dest} = 1;
1120                 } elsif ($v eq 'SOURCE') {
1121                     $v = $param->{source};
1122                     $param_used->{source} = 1;
1123                 }
1124
1125                 die "missing parameter '$k' in macro '$macro_name'\n" if !defined($v);
1126                 $rule->{$k} = $v;
1127             }
1128             foreach my $k (keys %$param) {
1129                 next if !defined($param->{$k});
1130                 next if $param_used->{$k};
1131                 if (defined($rule->{$k})) {
1132                     die "parameter '$k' already define in macro (value = '$rule->{$k}')\n"
1133                         if $rule->{$k} ne $param->{$k};
1134                 } else {
1135                     $rule->{$k} = $param->{$k};
1136                 }
1137             }
1138             push @$rules, $rule;
1139         }
1140     } else {
1141         push @$rules, $param;
1142     }
1143
1144     foreach my $rule (@$rules) {
1145         $rule->{nbdport} = parse_port_name_number_or_range($rule->{dport})
1146             if defined($rule->{dport});
1147         $rule->{nbsport} = parse_port_name_number_or_range($rule->{sport})
1148             if defined($rule->{sport});
1149     }
1150
1151     return $rules;
1152 }
1153
1154 sub parse_fw_option {
1155     my ($line) = @_;
1156
1157     my ($opt, $value);
1158
1159     if ($line =~ m/^(enable|dhcp|macfilter|nosmurfs|tcpflags):\s*(0|1)\s*$/i) {
1160         $opt = lc($1);
1161         $value = int($2);
1162     } elsif ($line =~ m/^(policy-(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1163         $opt = lc($1);
1164         $value = uc($3);
1165     } else {
1166         chomp $line;
1167         die "can't parse option '$line'\n"
1168     }
1169
1170     return ($opt, $value);
1171 }
1172
1173 sub parse_vm_fw_rules {
1174     my ($filename, $fh) = @_;
1175
1176     my $res = { in => [], out => [], options => {}};
1177
1178     my $section;
1179
1180     while (defined(my $line = <$fh>)) {
1181         next if $line =~ m/^#/;
1182         next if $line =~ m/^\s*$/;
1183
1184         my $linenr = $fh->input_line_number();
1185         my $prefix = "$filename (line $linenr)";
1186
1187         if ($line =~ m/^\[(\S+)\]\s*$/i) {
1188             $section = lc($1);
1189             warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1190             next;
1191         }
1192         if (!$section) {
1193             warn "$prefix: skip line - no section";
1194             next;
1195         }
1196
1197         next if !$res->{$section}; # skip undefined section
1198
1199         if ($section eq 'options') {
1200             eval {
1201                 my ($opt, $value) = parse_fw_option($line);
1202                 $res->{options}->{$opt} = $value;
1203             };
1204             warn "$prefix: $@" if $@;
1205             next;
1206         }
1207
1208         my $rules;
1209         eval { $rules = parse_fw_rule($line, 1, 1); };
1210         if (my $err = $@) {
1211             warn "$prefix: $err";
1212             next;
1213         }
1214
1215         push @{$res->{$section}}, @$rules;
1216     }
1217
1218     return $res;
1219 }
1220
1221 sub parse_host_fw_rules {
1222     my ($filename, $fh) = @_;
1223
1224     my $res = { in => [], out => [] };
1225
1226     my $section;
1227
1228     while (defined(my $line = <$fh>)) {
1229         next if $line =~ m/^#/;
1230         next if $line =~ m/^\s*$/;
1231
1232         my $linenr = $fh->input_line_number();
1233         my $prefix = "$filename (line $linenr)";
1234
1235         if ($line =~ m/^\[(in|out)\]\s*$/i) {
1236             $section = lc($1);
1237             next;
1238         }
1239         if (!$section) {
1240             warn "$prefix: skip line - no section";
1241             next;
1242         }
1243
1244         my $rules;
1245         eval { $rules = parse_fw_rule($line, 1, 1); };
1246         if (my $err = $@) {
1247             warn "$prefix: $err";
1248             next;
1249         }
1250
1251         push @{$res->{$section}}, @$rules;
1252     }
1253
1254     return $res;
1255 }
1256
1257 sub parse_group_fw_rules {
1258     my ($filename, $fh) = @_;
1259
1260     my $section;
1261     my $group;
1262
1263     my $res = { in => [], out => [] };
1264
1265     while (defined(my $line = <$fh>)) {
1266         next if $line =~ m/^#/;
1267         next if $line =~ m/^\s*$/;
1268
1269         my $linenr = $fh->input_line_number();
1270         my $prefix = "$filename (line $linenr)";
1271
1272         if ($line =~ m/^\[(in|out):(\S+)\]\s*$/i) {
1273             $section = lc($1);
1274             $group = lc($2);
1275             next;
1276         }
1277         if (!$section || !$group) {
1278             warn "$prefix: skip line - no section";
1279             next;
1280         }
1281
1282         my $rules;
1283         eval { $rules = parse_fw_rule($line, 0, 0); };
1284         if (my $err = $@) {
1285             warn "$prefix: $err";
1286             next;
1287         }
1288
1289         push @{$res->{$group}->{$section}}, @$rules;
1290     }
1291
1292     return $res;
1293 }
1294
1295 sub run_locked {
1296     my ($code, @param) = @_;
1297
1298     my $timeout = 10;
1299
1300     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
1301
1302     die $@ if $@;
1303
1304     return $res;
1305 }
1306
1307 sub read_local_vm_config {
1308
1309     my $openvz = {};
1310
1311     my $qemu = {};
1312
1313     my $list = PVE::QemuServer::config_list();
1314
1315     foreach my $vmid (keys %$list) {
1316         my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
1317         if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
1318             $qemu->{$vmid} = $conf;
1319         }
1320     }
1321
1322     my $vmdata = { openvz => $openvz, qemu => $qemu };
1323
1324     return $vmdata;
1325 };
1326
1327 sub read_vm_firewall_rules {
1328     my ($vmdata) = @_;
1329     my $rules = {};
1330     foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
1331         my $filename = "/etc/pve/firewall/$vmid.fw";
1332         my $fh = IO::File->new($filename, O_RDONLY);
1333         next if !$fh;
1334
1335         $rules->{$vmid} = parse_vm_fw_rules($filename, $fh);
1336     }
1337
1338     return $rules;
1339 }
1340
1341 sub generate_std_chains {
1342     my ($ruleset) = @_;
1343
1344     foreach my $chain (keys %$pve_std_chains) {
1345         ruleset_create_chain($ruleset, $chain);
1346         foreach my $rule (@{$pve_std_chains->{$chain}}) {
1347             if (ref($rule)) {
1348                 ruleset_generate_rule($ruleset, $chain, $rule);
1349             } else {
1350                 ruleset_addrule($ruleset, $chain, $rule);
1351             }
1352         }
1353     }
1354 }
1355
1356 sub compile {
1357     my $vmdata = read_local_vm_config();
1358     my $rules = read_vm_firewall_rules($vmdata);
1359
1360     my $group_rules = {};
1361     my $filename = "/etc/pve/firewall/groups.fw";
1362     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1363         $group_rules = parse_group_fw_rules($filename, $fh);
1364     }
1365
1366     #print Dumper($rules);
1367
1368     my $ruleset = {};
1369
1370     ruleset_create_chain($ruleset, "PVEFW-INPUT");
1371     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
1372     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
1373
1374     generate_std_chains($ruleset);
1375
1376     my $enable_hostfw = 0;
1377     $filename = "/etc/pve/local/host.fw";
1378     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1379         my $host_rules = parse_host_fw_rules($filename, $fh);
1380
1381         $enable_hostfw = 1;
1382
1383         enablehostfw($ruleset, $host_rules, $group_rules);
1384     }
1385
1386     # generate firewall rules for QEMU VMs
1387     foreach my $vmid (keys %{$vmdata->{qemu}}) {
1388         my $conf = $vmdata->{qemu}->{$vmid};
1389         my $vmfw_conf = $rules->{$vmid};
1390         next if !$vmfw_conf;
1391         next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
1392
1393         foreach my $netid (keys %$conf) {
1394             next if $netid !~ m/^net(\d+)$/;
1395             my $net = PVE::QemuServer::parse_net($conf->{$netid});
1396             next if !$net;
1397             my $iface = "tap${vmid}i$1";
1398
1399             my $bridge = $net->{bridge};
1400             next if !$bridge; # fixme: ?
1401
1402             $bridge .= "v$net->{tag}" if $net->{tag};
1403
1404
1405             generate_bridge_chains($ruleset, $bridge);
1406
1407             my $macaddr = $net->{macaddr};
1408             generate_tap_rules_direction($ruleset, $group_rules, $iface, $netid, $macaddr, $vmfw_conf, $bridge, 'IN');
1409             generate_tap_rules_direction($ruleset, $group_rules, $iface, $netid, $macaddr, $vmfw_conf, $bridge, 'OUT');
1410         }
1411     }
1412
1413     if ($enable_hostfw) {
1414         # allow traffic from lo (ourself)
1415         ruleset_addrule($ruleset, "PVEFW-INPUT", "-i lo -j ACCEPT");
1416     }
1417
1418     return $ruleset;
1419 }
1420
1421 sub get_ruleset_status {
1422     my ($ruleset, $verbose) = @_;
1423
1424     my $active_chains = iptables_get_chains();
1425
1426     my $statushash = {};
1427
1428     foreach my $chain (sort keys %$ruleset) {
1429         my $digest = Digest::SHA->new('sha1');
1430         foreach my $cmd (@{$ruleset->{$chain}}) {
1431              $digest->add("$cmd\n");
1432         }
1433         my $sig = $digest->b64digest;
1434         $statushash->{$chain}->{sig} = $sig;
1435
1436         my $oldsig = $active_chains->{$chain};
1437         if (!defined($oldsig)) {
1438             $statushash->{$chain}->{action} = 'create';
1439         } else {
1440             if ($oldsig eq $sig) {
1441                 $statushash->{$chain}->{action} = 'exists';
1442             } else {
1443                 $statushash->{$chain}->{action} = 'update';
1444             }
1445         }
1446         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
1447         foreach my $cmd (@{$ruleset->{$chain}}) {
1448             print "\t$cmd\n" if $verbose;
1449         }
1450     }
1451
1452     foreach my $chain (sort keys %$active_chains) {
1453         if (!defined($ruleset->{$chain})) {
1454             my $sig = $active_chains->{$chain};
1455             $statushash->{$chain}->{action} = 'delete';
1456             $statushash->{$chain}->{sig} = $sig;
1457             print "delete $chain ($sig)\n" if $verbose;
1458         }
1459     }
1460
1461     return $statushash;
1462 }
1463
1464 sub print_ruleset {
1465     my ($ruleset) = @_;
1466
1467     get_ruleset_status($ruleset, 1);
1468 }
1469
1470 sub print_sig_rule {
1471     my ($chain, $sig) = @_;
1472
1473     # We just use this to store a SHA1 checksum used to detect changes
1474     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
1475 }
1476
1477 sub apply_ruleset {
1478     my ($ruleset, $verbose) = @_;
1479
1480     enable_bridge_firewall();
1481
1482     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
1483
1484     my $statushash = get_ruleset_status($ruleset, $verbose);
1485
1486     # create missing chains first
1487     foreach my $chain (sort keys %$ruleset) {
1488         my $stat = $statushash->{$chain};
1489         die "internal error" if !$stat;
1490         next if $stat->{action} ne 'create';
1491
1492         $cmdlist .= ":$chain - [0:0]\n";
1493     }
1494
1495     my $rule = "INPUT -j PVEFW-INPUT";
1496     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1497         $cmdlist .= "-A $rule\n";
1498     }
1499     $rule = "OUTPUT -j PVEFW-OUTPUT";
1500     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1501         $cmdlist .= "-A $rule\n";
1502     }
1503
1504     $rule = "FORWARD -j PVEFW-FORWARD";
1505     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1506         $cmdlist .= "-A $rule\n";
1507     }
1508
1509     foreach my $chain (sort keys %$ruleset) {
1510         my $stat = $statushash->{$chain};
1511         die "internal error" if !$stat;
1512
1513         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
1514             $cmdlist .= "-F $chain\n";
1515             foreach my $cmd (@{$ruleset->{$chain}}) {
1516                 $cmdlist .= "$cmd\n";
1517             }
1518             $cmdlist .= print_sig_rule($chain, $stat->{sig});
1519         } elsif ($stat->{action} eq 'delete') {
1520             die "internal error"; # this should not happen
1521         } elsif ($stat->{action} eq 'exists') {
1522             # do nothing
1523         } else {
1524             die "internal error - unknown status '$stat->{action}'";
1525         }
1526     }
1527
1528     foreach my $chain (keys %$statushash) {
1529         next if $statushash->{$chain}->{action} ne 'delete';
1530         $cmdlist .= "-F $chain\n";
1531     }
1532     foreach my $chain (keys %$statushash) {
1533         next if $statushash->{$chain}->{action} ne 'delete';
1534         next if $chain eq 'PVEFW-INPUT';
1535         next if $chain eq 'PVEFW-OUTPUT';
1536         next if $chain eq 'PVEFW-FORWARD';
1537         $cmdlist .= "-X $chain\n";
1538     }
1539
1540     $cmdlist .= "COMMIT\n";
1541
1542     print $cmdlist if $verbose;
1543
1544     iptables_restore_cmdlist($cmdlist);
1545
1546     # test: re-read status and check if everything is up to date
1547     $statushash = get_ruleset_status($ruleset);
1548
1549     my $errors;
1550     foreach my $chain (sort keys %$ruleset) {
1551         my $stat = $statushash->{$chain};
1552         if ($stat->{action} ne 'exists') {
1553             warn "unable to update chain '$chain'\n";
1554             $errors = 1;
1555         }
1556     }
1557
1558     die "unable to apply firewall changes\n" if $errors;
1559 }
1560
1561 1;