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