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