src/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::Basename;
  10 use File::Path;
  11 use IO::File;
  12 use Net::IP;
  13 use PVE::Tools qw(run_command lock_file);
  14
  15 use Data::Dumper;
  16
  17 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
  18 my $pve_fw_status_filename = "/var/lib/pve-firewall/pvefw.status";
  19
  20 my $default_log_level = 'info';
  21
  22 my $log_level_hash = {
  23     debug => 7,
  24     info => 6,
  25     notice => 5,
  26     warning => 4,
  27     err => 3,
  28     crit => 2,
  29     alert => 1,
  30     emerg => 0,
  31 };
  32
  33 # imported/converted from: /usr/share/shorewall/macro.*
  34 my $pve_fw_macros = {
  35     'Amanda' => [
  36         { action => 'PARAM', proto => 'udp', dport => '10080' },
  37         { action => 'PARAM', proto => 'tcp', dport => '10080' },
  38     ],
  39     'Auth' => [
  40         { action => 'PARAM', proto => 'tcp', dport => '113' },
  41     ],
  42     'BGP' => [
  43         { action => 'PARAM', proto => 'tcp', dport => '179' },
  44     ],
  45     'BitTorrent' => [
  46         { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
  47         { action => 'PARAM', proto => 'udp', dport => '6881' },
  48     ],
  49     'BitTorrent32' => [
  50         { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
  51         { action => 'PARAM', proto => 'udp', dport => '6881' },
  52     ],
  53     'CVS' => [
  54         { action => 'PARAM', proto => 'tcp', dport => '2401' },
  55     ],
  56     'Citrix' => [
  57         { action => 'PARAM', proto => 'tcp', dport => '1494' },
  58         { action => 'PARAM', proto => 'udp', dport => '1604' },
  59         { action => 'PARAM', proto => 'tcp', dport => '2598' },
  60     ],
  61     'DAAP' => [
  62         { action => 'PARAM', proto => 'tcp', dport => '3689' },
  63         { action => 'PARAM', proto => 'udp', dport => '3689' },
  64     ],
  65     'DCC' => [
  66         { action => 'PARAM', proto => 'tcp', dport => '6277' },
  67     ],
  68     'DHCPfwd' => [
  69         { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
  70         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '67:68', sport => '67:68' },
  71     ],
  72     'DNS' => [
  73         { action => 'PARAM', proto => 'udp', dport => '53' },
  74         { action => 'PARAM', proto => 'tcp', dport => '53' },
  75     ],
  76     'Distcc' => [
  77         { action => 'PARAM', proto => 'tcp', dport => '3632' },
  78     ],
  79     'Edonkey' => [
  80         { action => 'PARAM', proto => 'tcp', dport => '4662' },
  81         { action => 'PARAM', proto => 'udp', dport => '4665' },
  82     ],
  83     'FTP' => [
  84         { action => 'PARAM', proto => 'tcp', dport => '21' },
  85     ],
  86     'Finger' => [
  87         { action => 'PARAM', proto => 'tcp', dport => '79' },
  88     ],
  89     'GNUnet' => [
  90         { action => 'PARAM', proto => 'tcp', dport => '2086' },
  91         { action => 'PARAM', proto => 'udp', dport => '2086' },
  92         { action => 'PARAM', proto => 'tcp', dport => '1080' },
  93         { action => 'PARAM', proto => 'udp', dport => '1080' },
  94     ],
  95     'GRE' => [
  96         { action => 'PARAM', proto => '47' },
  97         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '47' },
  98     ],
  99     'Git' => [
 100         { action => 'PARAM', proto => 'tcp', dport => '9418' },
 101     ],
 102     'Gnutella' => [
 103         { action => 'PARAM', proto => 'tcp', dport => '6346' },
 104         { action => 'PARAM', proto => 'udp', dport => '6346' },
 105     ],
 106     'HKP' => [
 107         { action => 'PARAM', proto => 'tcp', dport => '11371' },
 108     ],
 109     'HTTP' => [
 110         { action => 'PARAM', proto => 'tcp', dport => '80' },
 111     ],
 112     'HTTPS' => [
 113         { action => 'PARAM', proto => 'tcp', dport => '443' },
 114     ],
 115     'ICPV2' => [
 116         { action => 'PARAM', proto => 'udp', dport => '3130' },
 117     ],
 118     'ICQ' => [
 119         { action => 'PARAM', proto => 'tcp', dport => '5190' },
 120     ],
 121     'IMAP' => [
 122         { action => 'PARAM', proto => 'tcp', dport => '143' },
 123     ],
 124     'IMAPS' => [
 125         { action => 'PARAM', proto => 'tcp', dport => '993' },
 126     ],
 127     'IPIP' => [
 128         { action => 'PARAM', proto => '94' },
 129         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '94' },
 130     ],
 131     'IPP' => [
 132         { action => 'PARAM', proto => 'tcp', dport => '631' },
 133     ],
 134     'IPPbrd' => [
 135         { action => 'PARAM', proto => 'udp', dport => '631' },
 136     ],
 137     'IPPserver' => [
 138         { action => 'PARAM', source => 'SOURCE', dest => 'DEST', proto => 'tcp', dport => '631' },
 139         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '631' },
 140     ],
 141     'IPsec' => [
 142         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 143         { action => 'PARAM', proto => '50' },
 144         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500', sport => '500' },
 145         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '50' },
 146     ],
 147     'IPsecah' => [
 148         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 149         { action => 'PARAM', proto => '51' },
 150         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500', sport => '500' },
 151         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '51' },
 152     ],
 153     'IPsecnat' => [
 154         { action => 'PARAM', proto => 'udp', dport => '500' },
 155         { action => 'PARAM', proto => 'udp', dport => '4500' },
 156         { action => 'PARAM', proto => '50' },
 157         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500' },
 158         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '4500' },
 159         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '50' },
 160     ],
 161     'IRC' => [
 162         { action => 'PARAM', proto => 'tcp', dport => '6667' },
 163     ],
 164     'JabberPlain' => [
 165         { action => 'PARAM', proto => 'tcp', dport => '5222' },
 166     ],
 167     'JabberSecure' => [
 168         { action => 'PARAM', proto => 'tcp', dport => '5223' },
 169     ],
 170     'Jabberd' => [
 171         { action => 'PARAM', proto => 'tcp', dport => '5269' },
 172     ],
 173     'Jetdirect' => [
 174         { action => 'PARAM', proto => 'tcp', dport => '9100' },
 175     ],
 176     'L2TP' => [
 177         { action => 'PARAM', proto => 'udp', dport => '1701' },
 178         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '1701' },
 179     ],
 180     'LDAP' => [
 181         { action => 'PARAM', proto => 'tcp', dport => '389' },
 182     ],
 183     'LDAPS' => [
 184         { action => 'PARAM', proto => 'tcp', dport => '636' },
 185     ],
 186     'MSNP' => [
 187         { action => 'PARAM', proto => 'tcp', dport => '1863' },
 188     ],
 189     'MSSQL' => [
 190         { action => 'PARAM', proto => 'tcp', dport => '1433' },
 191     ],
 192     'Mail' => [
 193         { action => 'PARAM', proto => 'tcp', dport => '25' },
 194         { action => 'PARAM', proto => 'tcp', dport => '465' },
 195         { action => 'PARAM', proto => 'tcp', dport => '587' },
 196     ],
 197     'Munin' => [
 198         { action => 'PARAM', proto => 'tcp', dport => '4949' },
 199     ],
 200     'MySQL' => [
 201         { action => 'PARAM', proto => 'tcp', dport => '3306' },
 202     ],
 203     'NNTP' => [
 204         { action => 'PARAM', proto => 'tcp', dport => '119' },
 205     ],
 206     'NNTPS' => [
 207         { action => 'PARAM', proto => 'tcp', dport => '563' },
 208     ],
 209     'NTP' => [
 210         { action => 'PARAM', proto => 'udp', dport => '123' },
 211     ],
 212     'NTPbi' => [
 213         { action => 'PARAM', proto => 'udp', dport => '123' },
 214         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '123' },
 215     ],
 216     'NTPbrd' => [
 217         { action => 'PARAM', proto => 'udp', dport => '123' },
 218         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '123' },
 219     ],
 220     'OSPF' => [
 221         { action => 'PARAM', proto => '89' },
 222     ],
 223     'OpenVPN' => [
 224         { action => 'PARAM', proto => 'udp', dport => '1194' },
 225     ],
 226     'PCA' => [
 227         { action => 'PARAM', proto => 'udp', dport => '5632' },
 228         { action => 'PARAM', proto => 'tcp', dport => '5631' },
 229     ],
 230     'POP3' => [
 231         { action => 'PARAM', proto => 'tcp', dport => '110' },
 232     ],
 233     'POP3S' => [
 234         { action => 'PARAM', proto => 'tcp', dport => '995' },
 235     ],
 236     'PPtP' => [
 237         { action => 'PARAM', proto => '47' },
 238         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '47' },
 239         { action => 'PARAM', proto => 'tcp', dport => '1723' },
 240     ],
 241     'Ping' => [
 242         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 243     ],
 244     'PostgreSQL' => [
 245         { action => 'PARAM', proto => 'tcp', dport => '5432' },
 246     ],
 247     'Printer' => [
 248         { action => 'PARAM', proto => 'tcp', dport => '515' },
 249     ],
 250     'RDP' => [
 251         { action => 'PARAM', proto => 'tcp', dport => '3389' },
 252     ],
 253     'RIPbi' => [
 254         { action => 'PARAM', proto => 'udp', dport => '520' },
 255         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '520' },
 256     ],
 257     'RNDC' => [
 258         { action => 'PARAM', proto => 'tcp', dport => '953' },
 259     ],
 260     'Razor' => [
 261         { action => 'ACCEPT', proto => 'tcp', dport => '2703' },
 262     ],
 263     'Rdate' => [
 264         { action => 'PARAM', proto => 'tcp', dport => '37' },
 265     ],
 266     'Rsync' => [
 267         { action => 'PARAM', proto => 'tcp', dport => '873' },
 268     ],
 269     'SANE' => [
 270         { action => 'PARAM', proto => 'tcp', dport => '6566' },
 271     ],
 272     'SMB' => [
 273         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 274         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 275         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 276         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 277     ],
 278     'SMBBI' => [
 279         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 280         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 281         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 282         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 283         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '135,445' },
 284         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '137:139' },
 285         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '1024:65535', sport => '137' },
 286         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'tcp', dport => '135,139,445' },
 287     ],
 288     'SMBswat' => [
 289         { action => 'PARAM', proto => 'tcp', dport => '901' },
 290     ],
 291     'SMTP' => [
 292         { action => 'PARAM', proto => 'tcp', dport => '25' },
 293     ],
 294     'SMTPS' => [
 295         { action => 'PARAM', proto => 'tcp', dport => '465' },
 296     ],
 297     'SNMP' => [
 298         { action => 'PARAM', proto => 'udp', dport => '161:162' },
 299         { action => 'PARAM', proto => 'tcp', dport => '161' },
 300     ],
 301     'SPAMD' => [
 302         { action => 'PARAM', proto => 'tcp', dport => '783' },
 303     ],
 304     'SSH' => [
 305         { action => 'PARAM', proto => 'tcp', dport => '22' },
 306     ],
 307     'SVN' => [
 308         { action => 'PARAM', proto => 'tcp', dport => '3690' },
 309     ],
 310     'SixXS' => [
 311         { action => 'PARAM', proto => 'tcp', dport => '3874' },
 312         { action => 'PARAM', proto => 'udp', dport => '3740' },
 313         { action => 'PARAM', proto => '41' },
 314         { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
 315     ],
 316     'Squid' => [
 317         { action => 'PARAM', proto => 'tcp', dport => '3128' },
 318     ],
 319     'Submission' => [
 320         { action => 'PARAM', proto => 'tcp', dport => '587' },
 321     ],
 322     'Syslog' => [
 323         { action => 'PARAM', proto => 'udp', dport => '514' },
 324         { action => 'PARAM', proto => 'tcp', dport => '514' },
 325     ],
 326     'TFTP' => [
 327         { action => 'PARAM', proto => 'udp', dport => '69' },
 328     ],
 329     'Telnet' => [
 330         { action => 'PARAM', proto => 'tcp', dport => '23' },
 331     ],
 332     'Telnets' => [
 333         { action => 'PARAM', proto => 'tcp', dport => '992' },
 334     ],
 335     'Time' => [
 336         { action => 'PARAM', proto => 'tcp', dport => '37' },
 337     ],
 338     'Trcrt' => [
 339         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 340         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 341     ],
 342     'VNC' => [
 343         { action => 'PARAM', proto => 'tcp', dport => '5900:5909' },
 344     ],
 345     'VNCL' => [
 346         { action => 'PARAM', proto => 'tcp', dport => '5500' },
 347     ],
 348     'Web' => [
 349         { action => 'PARAM', proto => 'tcp', dport => '80' },
 350         { action => 'PARAM', proto => 'tcp', dport => '443' },
 351     ],
 352     'Webcache' => [
 353         { action => 'PARAM', proto => 'tcp', dport => '8080' },
 354     ],
 355     'Webmin' => [
 356         { action => 'PARAM', proto => 'tcp', dport => '10000' },
 357     ],
 358     'Whois' => [
 359         { action => 'PARAM', proto => 'tcp', dport => '43' },
 360     ],
 361 };
 362
 363 my $pve_fw_parsed_macros;
 364 my $pve_fw_preferred_macro_names = {};
 365
 366 my $pve_std_chains = {
 367     'PVEFW-SET-ACCEPT-MARK' => [
 368         "-j MARK --set-mark 1",
 369     ],
 370     'PVEFW-DropBroadcast' => [
 371         # same as shorewall 'Broadcast'
 372         # simply DROP BROADCAST/MULTICAST/ANYCAST
 373         # we can use this to reduce logging
 374         { action => 'DROP', dsttype => 'BROADCAST' },
 375         { action => 'DROP', dsttype => 'MULTICAST' },
 376         { action => 'DROP', dsttype => 'ANYCAST' },
 377         { action => 'DROP', dest => '224.0.0.0/4' },
 378     ],
 379     'PVEFW-reject' => [
 380         # same as shorewall 'reject'
 381         { action => 'DROP', dsttype => 'BROADCAST' },
 382         { action => 'DROP', source => '224.0.0.0/4' },
 383         { action => 'DROP', proto => 'icmp' },
 384         "-p tcp -j REJECT --reject-with tcp-reset",
 385         "-p udp -j REJECT --reject-with icmp-port-unreachable",
 386         "-p icmp -j REJECT --reject-with icmp-host-unreachable",
 387         "-j REJECT --reject-with icmp-host-prohibited",
 388     ],
 389     'PVEFW-Drop' => [
 390         # same as shorewall 'Drop', which is equal to DROP,
 391         # but REJECT/DROP some packages to reduce logging,
 392         # and ACCEPT critical ICMP types
 393         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 394         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 395         { action => 'PVEFW-DropBroadcast' },
 396         # ACCEPT critical ICMP types
 397         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 398         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 399         # Drop packets with INVALID state
 400         "-m conntrack --ctstate INVALID -j DROP",
 401         # Drop Microsoft SMB noise
 402         { action => 'DROP', proto => 'udp', dport => '135,445', nbdport => 2 },
 403         { action => 'DROP', proto => 'udp', dport => '137:139'},
 404         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 405         { action => 'DROP', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
 406         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 407         # Drop new/NotSyn traffic so that it doesn't get logged
 408         "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
 409         # Drop DNS replies
 410         { action => 'DROP', proto => 'udp', sport => 53 },
 411     ],
 412     'PVEFW-Reject' => [
 413         # same as shorewall 'Reject', which is equal to Reject,
 414         # but REJECT/DROP some packages to reduce logging,
 415         # and ACCEPT critical ICMP types
 416         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 417         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 418         { action => 'PVEFW-DropBroadcast' },
 419         # ACCEPT critical ICMP types
 420         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 421         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 422         # Drop packets with INVALID state
 423         "-m conntrack --ctstate INVALID -j DROP",
 424         # Drop Microsoft SMB noise
 425         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445', nbdport => 2 },
 426         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
 427         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 428         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
 429         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 430         # Drop new/NotSyn traffic so that it doesn't get logged
 431         "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
 432         # Drop DNS replies
 433         { action => 'DROP', proto => 'udp', sport => 53 },
 434     ],
 435     'PVEFW-tcpflags' => [
 436         # same as shorewall tcpflags action.
 437         # Packets arriving on this interface are checked for som illegal combinations of TCP flags
 438         "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
 439         "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
 440         "-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
 441         "-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
 442         "-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
 443     ],
 444     'PVEFW-smurfs' => [
 445         # same as shorewall smurfs action
 446         # Filter packets for smurfs (packets with a broadcast address as the source).
 447         "-s 0.0.0.0/32 -j RETURN",
 448         "-m addrtype --src-type BROADCAST -g PVEFW-smurflog",
 449         "-s 224.0.0.0/4 -g PVEFW-smurflog",
 450     ],
 451 };
 452
 453 # iptables -p icmp -h
 454 my $icmp_type_names = {
 455     any => 1,
 456     'echo-reply' => 1,
 457     'destination-unreachable' => 1,
 458     'network-unreachable' => 1,
 459     'host-unreachable' => 1,
 460     'protocol-unreachable' => 1,
 461     'port-unreachable' => 1,
 462     'fragmentation-needed' => 1,
 463     'source-route-failed' => 1,
 464     'network-unknown' => 1,
 465     'host-unknown' => 1,
 466     'network-prohibited' => 1,
 467     'host-prohibited' => 1,
 468     'TOS-network-unreachable' => 1,
 469     'TOS-host-unreachable' => 1,
 470     'communication-prohibited' => 1,
 471     'host-precedence-violation' => 1,
 472     'precedence-cutoff' => 1,
 473     'source-quench' => 1,
 474     'redirect' => 1,
 475     'network-redirect' => 1,
 476     'host-redirect' => 1,
 477     'TOS-network-redirect' => 1,
 478     'TOS-host-redirect' => 1,
 479     'echo-request' => 1,
 480     'router-advertisement' => 1,
 481     'router-solicitation' => 1,
 482     'time-exceeded' => 1,
 483     'ttl-zero-during-transit' => 1,
 484     'ttl-zero-during-reassembly' => 1,
 485     'parameter-problem' => 1,
 486     'ip-header-bad' => 1,
 487     'required-option-missing' => 1,
 488     'timestamp-request' => 1,
 489     'timestamp-reply' => 1,
 490     'address-mask-request' => 1,
 491     'address-mask-reply' => 1,
 492 };
 493
 494 sub get_firewall_macros {
 495
 496     return $pve_fw_parsed_macros if $pve_fw_parsed_macros;
 497
 498     $pve_fw_parsed_macros = {};
 499
 500     foreach my $k (keys %$pve_fw_macros) {
 501         my $name = lc($k);
 502
 503         my $macro =  $pve_fw_macros->{$k};
 504         $pve_fw_preferred_macro_names->{$name} = $k;
 505         $pve_fw_parsed_macros->{$name} = $macro;
 506     }
 507
 508     return $pve_fw_parsed_macros;
 509 }
 510
 511 my $etc_services;
 512
 513 sub get_etc_services {
 514
 515     return $etc_services if $etc_services;
 516
 517     my $filename = "/etc/services";
 518
 519     my $fh = IO::File->new($filename, O_RDONLY);
 520     if (!$fh) {
 521         warn "unable to read '$filename' - $!\n";
 522         return {};
 523     }
 524
 525     my $services = {};
 526
 527     while (my $line = <$fh>) {
 528         chomp ($line);
 529         next if $line =~m/^#/;
 530         next if ($line =~m/^\s*$/);
 531
 532         if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp).*$!) {
 533             $services->{byid}->{$2}->{name} = $1;
 534             $services->{byid}->{$2}->{port} = $2;
 535             $services->{byid}->{$2}->{$3} = 1;
 536             $services->{byname}->{$1} = $services->{byid}->{$2};
 537         }
 538     }
 539
 540     close($fh);
 541
 542     $etc_services = $services;
 543
 544
 545     return $etc_services;
 546 }
 547
 548 my $etc_protocols;
 549
 550 sub get_etc_protocols {
 551     return $etc_protocols if $etc_protocols;
 552
 553     my $filename = "/etc/protocols";
 554
 555     my $fh = IO::File->new($filename, O_RDONLY);
 556     if (!$fh) {
 557         warn "unable to read '$filename' - $!\n";
 558         return {};
 559     }
 560
 561     my $protocols = {};
 562
 563     while (my $line = <$fh>) {
 564         chomp ($line);
 565         next if $line =~m/^#/;
 566         next if ($line =~m/^\s*$/);
 567
 568         if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
 569             $protocols->{byid}->{$2}->{name} = $1;
 570             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
 571         }
 572     }
 573
 574     close($fh);
 575
 576     $etc_protocols = $protocols;
 577
 578     return $etc_protocols;
 579 }
 580
 581 sub parse_address_list {
 582     my ($str) = @_;
 583
 584     my $nbaor = 0;
 585     foreach my $aor (split(/,/, $str)) {
 586         if (!Net::IP->new($aor)) {
 587             my $err = Net::IP::Error();
 588             die "invalid IP address: $err\n";
 589         }else{
 590             $nbaor++;
 591         }
 592     }
 593     return $nbaor;
 594 }
 595
 596 sub parse_port_name_number_or_range {
 597     my ($str) = @_;
 598
 599     my $services = PVE::Firewall::get_etc_services();
 600     my $nbports = 0;
 601     foreach my $item (split(/,/, $str)) {
 602         my $portlist = "";
 603         my $oldpon = undef;
 604         $nbports++;
 605         foreach my $pon (split(':', $item, 2)) {
 606             $pon = $services->{byname}->{$pon}->{port} if $services->{byname}->{$pon}->{port};
 607             if ($pon =~ m/^\d+$/){
 608                 die "invalid port '$pon'\n" if $pon < 0 && $pon > 65535;
 609                 die "port '$pon' must be bigger than port '$oldpon' \n" if $oldpon && ($pon < $oldpon);
 610                 $oldpon = $pon;
 611             }else{
 612                 die "invalid port $services->{byname}->{$pon}\n" if !$services->{byname}->{$pon};
 613             }
 614         }
 615     }
 616
 617     return ($nbports);
 618 }
 619
 620 my $bridge_firewall_enabled = 0;
 621
 622 sub enable_bridge_firewall {
 623
 624     return if $bridge_firewall_enabled; # only once
 625
 626     system("echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables");
 627     system("echo 1 > /proc/sys/net/bridge/bridge-nf-call-ip6tables");
 628
 629     $bridge_firewall_enabled = 1;
 630 }
 631
 632 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
 633
 634 sub iptables {
 635     my ($cmd) = @_;
 636
 637     run_command("/sbin/iptables $cmd", outfunc => sub {}, errfunc => sub {});
 638 }
 639
 640 sub iptables_restore_cmdlist {
 641     my ($cmdlist) = @_;
 642
 643     run_command("/sbin/iptables-restore -n", input => $cmdlist);
 644 }
 645
 646 sub iptables_get_chains {
 647
 648     my $res = {};
 649
 650     # check what chains we want to track
 651     my $is_pvefw_chain = sub {
 652         my $name = shift;
 653
 654         return 1 if $name =~ m/^PVEFW-\S+$/;
 655
 656         return 1 if $name =~ m/^tap\d+i\d+-(:?IN|OUT)$/;
 657         return 1 if $name =~ m/^vmbr\d+-(:?FW|IN|OUT)$/;
 658         return 1 if $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/;
 659
 660         return undef;
 661     };
 662
 663     my $table = '';
 664
 665     my $parser = sub {
 666         my $line = shift;
 667
 668         return if $line =~ m/^#/;
 669         return if $line =~ m/^\s*$/;
 670
 671         if ($line =~ m/^\*(\S+)$/) {
 672             $table = $1;
 673             return;
 674         }
 675
 676         return if $table ne 'filter';
 677
 678         if ($line =~ m/^:(\S+)\s/) {
 679             my $chain = $1;
 680             return if !&$is_pvefw_chain($chain);
 681             $res->{$chain} = "unknown";
 682         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
 683             my ($chain, $sig) = ($1, $2);
 684             return if !&$is_pvefw_chain($chain);
 685             $res->{$chain} = $sig;
 686         } else {
 687             # simply ignore the rest
 688             return;
 689         }
 690     };
 691
 692     run_command("/sbin/iptables-save", outfunc => $parser);
 693
 694     return $res;
 695 }
 696
 697 sub iptables_chain_exist {
 698     my ($chain) = @_;
 699
 700     eval{
 701         iptables("-n --list $chain");
 702     };
 703     return undef if $@;
 704
 705     return 1;
 706 }
 707
 708 sub iptables_rule_exist {
 709     my ($rule) = @_;
 710
 711     eval{
 712         iptables("-C $rule");
 713     };
 714     return undef if $@;
 715
 716     return 1;
 717 }
 718
 719 sub ruleset_generate_rule {
 720     my ($ruleset, $chain, $rule, $actions, $goto) = @_;
 721
 722     return if $rule->{disable};
 723
 724     my @cmd = ();
 725
 726     push @cmd, "-m iprange --src-range" if $rule->{nbsource} && $rule->{nbsource} > 1;
 727     push @cmd, "-s $rule->{source}" if $rule->{source};
 728     push @cmd, "-m iprange --dst-range" if $rule->{nbdest} && $rule->{nbdest} > 1;
 729     push @cmd, "-d $rule->{dest}" if $rule->{dest};
 730
 731     if ($rule->{proto}) {
 732         push @cmd, "-p $rule->{proto}";
 733
 734         my $multiport = 0;
 735         $multiport++ if $rule->{nbdport} && ($rule->{nbdport} > 1);
 736         $multiport++ if $rule->{nbsport} && ($rule->{nbsport} > 1);
 737
 738         push @cmd, "--match multiport" if $multiport;
 739
 740         die "multiport: option '--sports' cannot be used together with '--dports'\n"
 741             if ($multiport == 2) && ($rule->{dport} ne $rule->{sport});
 742
 743         if ($rule->{dport}) {
 744             if ($rule->{proto} && $rule->{proto} eq 'icmp') {
 745                 # Note: we use dport to store --icmp-type
 746                 die "unknown icmp-type '$rule->{dport}'\n" if !defined($icmp_type_names->{$rule->{dport}});
 747                 push @cmd, "-m icmp --icmp-type $rule->{dport}";
 748             } else {
 749                 if ($rule->{nbdport} && $rule->{nbdport} > 1) {
 750                     if ($multiport == 2) {
 751                         push @cmd,  "--ports $rule->{dport}";
 752                     } else {
 753                         push @cmd, "--dports $rule->{dport}";
 754                     }
 755                 } else {
 756                     push @cmd, "--dport $rule->{dport}";
 757                 }
 758             }
 759         }
 760
 761         if ($rule->{sport}) {
 762             if ($rule->{nbsport} && $rule->{nbsport} > 1) {
 763                 push @cmd, "--sports $rule->{sport}" if $multiport != 2;
 764             } else {
 765                 push @cmd, "--sport $rule->{sport}";
 766             }
 767         }
 768     } elsif ($rule->{dport} || $rule->{sport}) {
 769         warn "ignoring destination port '$rule->{dport}' - no protocol specified\n" if $rule->{dport};
 770         warn "ignoring source port '$rule->{sport}' - no protocol specified\n" if $rule->{sport};
 771     }
 772
 773     push @cmd, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
 774
 775     if (my $action = $rule->{action}) {
 776         $action = $actions->{$action} if defined($actions->{$action});
 777         $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
 778         push @cmd, $goto ? "-g $action" : "-j $action";
 779     }
 780
 781     if (scalar(@cmd)) {
 782         my $cmdstr = join(' ', @cmd);
 783         ruleset_addrule($ruleset, $chain, $cmdstr);
 784     }
 785 }
 786
 787 sub ruleset_create_chain {
 788     my ($ruleset, $chain) = @_;
 789
 790     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
 791
 792     die "chain '$chain' already exists\n" if $ruleset->{$chain};
 793
 794     $ruleset->{$chain} = [];
 795 }
 796
 797 sub ruleset_chain_exist {
 798     my ($ruleset, $chain) = @_;
 799
 800     return $ruleset->{$chain} ? 1 : undef;
 801 }
 802
 803 sub ruleset_addrule {
 804    my ($ruleset, $chain, $rule) = @_;
 805
 806    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 807
 808    push @{$ruleset->{$chain}}, "-A $chain $rule";
 809 }
 810
 811 sub ruleset_insertrule {
 812    my ($ruleset, $chain, $rule) = @_;
 813
 814    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 815
 816    unshift @{$ruleset->{$chain}}, "-A $chain $rule";
 817 }
 818
 819 sub generate_bridge_chains {
 820     my ($ruleset, $bridge) = @_;
 821
 822     if (!ruleset_chain_exist($ruleset, "PVEFW-FORWARD")){
 823         ruleset_create_chain($ruleset, "PVEFW-FORWARD");
 824         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 825     }
 826
 827     if (!ruleset_chain_exist($ruleset, "$bridge-FW")) {
 828         ruleset_create_chain($ruleset, "$bridge-FW");
 829         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -m physdev --physdev-is-bridged -j $bridge-FW");
 830         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -m physdev --physdev-is-bridged -j $bridge-FW");
 831         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -j DROP");  # disable interbridge routing
 832         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -j DROP"); # disable interbridge routing
 833     }
 834
 835     if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) {
 836         ruleset_create_chain($ruleset, "$bridge-OUT");
 837         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-in -j $bridge-OUT");
 838     }
 839
 840     if (!ruleset_chain_exist($ruleset, "$bridge-IN")) {
 841         ruleset_create_chain($ruleset, "$bridge-IN");
 842         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-out -j $bridge-IN");
 843         ruleset_addrule($ruleset, "$bridge-FW", "-m mark --mark 1 -j ACCEPT");
 844         # accept traffic to unmanaged bridge ports
 845         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-out -j ACCEPT ");
 846     }
 847 }
 848
 849 sub generate_tap_rules_direction {
 850     my ($ruleset, $groups_conf, $iface, $netid, $macaddr, $vmfw_conf, $bridge, $direction) = @_;
 851
 852     my $lc_direction = lc($direction);
 853
 854     my $rules = $vmfw_conf->{rules};
 855
 856     my $options = $vmfw_conf->{options};
 857     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
 858
 859     my $tapchain = "$iface-$direction";
 860
 861     ruleset_create_chain($ruleset, $tapchain);
 862
 863     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
 864         ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
 865     }
 866
 867     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
 868         ruleset_addrule($ruleset, $tapchain, "-p udp -m udp --dport 67:68 -j ACCEPT");
 869     }
 870
 871     if ($options->{tcpflags}) {
 872         ruleset_addrule($ruleset, $tapchain, "-p tcp -j PVEFW-tcpflags");
 873     }
 874
 875     ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate INVALID -j DROP");
 876     ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 877
 878     if ($direction eq 'OUT' && defined($macaddr) &&
 879         !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
 880         ruleset_addrule($ruleset, $tapchain, "-m mac ! --mac-source $macaddr -j DROP");
 881     }
 882
 883     foreach my $rule (@$rules) {
 884         next if $rule->{iface} && $rule->{iface} ne $netid;
 885         next if $rule->{disable};
 886         if ($rule->{type} eq 'group') {
 887             my $group_chain = "GROUP-$rule->{action}-$direction";
 888             if(!ruleset_chain_exist($ruleset, $group_chain)){
 889                 generate_group_rules($ruleset, $groups_conf, $rule->{action});
 890             }
 891             ruleset_addrule($ruleset, $tapchain, "-j $group_chain");
 892             ruleset_addrule($ruleset, $tapchain, "-m mark --mark 1 -j RETURN")
 893                 if $direction eq 'OUT';
 894         } else {
 895             next if $rule->{type} ne $lc_direction;
 896             if ($direction eq 'OUT') {
 897                 ruleset_generate_rule($ruleset, $tapchain, $rule,
 898                                       { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
 899             } else {
 900                 ruleset_generate_rule($ruleset, $tapchain, $rule, { REJECT => "PVEFW-reject" });
 901             }
 902         }
 903     }
 904
 905     # implement policy
 906     my $policy;
 907
 908     if ($direction eq 'OUT') {
 909         $policy = $options->{'policy-out'} || 'ACCEPT'; # allow everything by default
 910     } else {
 911         $policy = $options->{'policy-in'} || 'DROP'; # allow everything by default
 912     }
 913
 914     if ($policy eq 'ACCEPT') {
 915         if ($direction eq 'OUT') {
 916             ruleset_addrule($ruleset, $tapchain, "-g PVEFW-SET-ACCEPT-MARK");
 917         } else {
 918             ruleset_addrule($ruleset, $tapchain, "-j ACCEPT");
 919         }
 920     } elsif ($policy eq 'DROP') {
 921
 922         ruleset_addrule($ruleset, $tapchain, "-j PVEFW-Drop");
 923
 924         ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-dropped: \" --log-level $loglevel")
 925             if defined($loglevel);
 926
 927         ruleset_addrule($ruleset, $tapchain, "-j DROP");
 928     } elsif ($policy eq 'REJECT') {
 929         ruleset_addrule($ruleset, $tapchain, "-j PVEFW-Reject");
 930
 931         ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-reject: \" --log-level $loglevel")
 932             if defined($loglevel);
 933
 934         ruleset_addrule($ruleset, $tapchain, "-g PVEFW-reject");
 935     } else {
 936         # should not happen
 937         die "internal error: unknown policy '$policy'";
 938     }
 939
 940     # plug the tap chain to bridge chain
 941     my $physdevdirection = $direction eq 'IN' ? "out" : "in";
 942     my $rule = "-m physdev --physdev-$physdevdirection $iface --physdev-is-bridged -j $tapchain";
 943     ruleset_insertrule($ruleset, "$bridge-$direction", $rule);
 944
 945     if ($direction eq 'OUT'){
 946         # add tap->host rules
 947         my $rule = "-m physdev --physdev-$physdevdirection $iface -j $tapchain";
 948         ruleset_addrule($ruleset, "PVEFW-INPUT", $rule);
 949     }
 950 }
 951
 952 sub enablehostfw {
 953     my ($ruleset, $hostfw_conf, $groups_conf) = @_;
 954
 955     # fixme: allow security groups
 956
 957     my $options = $hostfw_conf->{options};
 958     my $rules = $hostfw_conf->{rules};
 959
 960     # host inbound firewall
 961     my $chain = "PVEFW-HOST-IN";
 962     ruleset_create_chain($ruleset, $chain);
 963
 964     my $loglevel = get_option_log_level($options, "log_level_in");
 965
 966     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
 967     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 968     ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
 969     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 970     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW -m multiport --dports 5404,5405 -j ACCEPT");
 971     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT");  #corosync
 972
 973     foreach my $rule (@$rules) {
 974         next if $rule->{type} ne 'in';
 975         # we use RETURN because we need to check also tap rules
 976         ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => 'RETURN', REJECT => "PVEFW-reject" });
 977     }
 978
 979     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-IN dropped: \" --log-level $loglevel")
 980         if defined($loglevel);
 981
 982     ruleset_addrule($ruleset, $chain, "-j DROP");
 983
 984     # host outbound firewall
 985     $chain = "PVEFW-HOST-OUT";
 986     ruleset_create_chain($ruleset, $chain);
 987
 988     $loglevel = get_option_log_level($options, "log_level_out");
 989
 990     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
 991     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 992     ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
 993     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 994     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW -m multiport --dports 5404,5405 -j ACCEPT");
 995     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
 996
 997     foreach my $rule (@$rules) {
 998         next if $rule->{type} ne 'out';
 999         # we use RETURN because we need to check also tap rules
1000         ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => 'RETURN', REJECT => "PVEFW-reject" });
1001     }
1002
1003     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-OUT dropped: \" --log-level $loglevel")
1004         if defined($loglevel);
1005
1006     ruleset_addrule($ruleset, $chain, "-j DROP");
1007
1008     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
1009     ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
1010 }
1011
1012 sub generate_group_rules {
1013     my ($ruleset, $groups_conf, $group) = @_;
1014
1015     die "no such security group '$group'\n" if !$groups_conf->{$group};
1016
1017     my $rules = $groups_conf->{$group}->{rules};
1018
1019     my $chain = "GROUP-${group}-IN";
1020
1021     ruleset_create_chain($ruleset, $chain);
1022
1023     foreach my $rule (@$rules) {
1024         next if $rule->{type} ne 'in';
1025         ruleset_generate_rule($ruleset, $chain, $rule, { REJECT => "PVEFW-reject" });
1026     }
1027
1028     $chain = "GROUP-${group}-OUT";
1029
1030     ruleset_create_chain($ruleset, $chain);
1031     ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1032
1033     foreach my $rule (@$rules) {
1034         next if $rule->{type} ne 'out';
1035         # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
1036         # check also other tap rules later
1037         ruleset_generate_rule($ruleset, $chain, $rule,
1038                               { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" });
1039     }
1040 }
1041
1042 my $MAX_NETS = 32;
1043 my $valid_netdev_names = {};
1044 for (my $i = 0; $i < $MAX_NETS; $i++)  {
1045     $valid_netdev_names->{"net$i"} = 1;
1046 }
1047
1048 sub parse_fw_rule {
1049     my ($line, $need_iface, $allow_groups) = @_;
1050
1051     my $macros = get_firewall_macros();
1052     my $protocols = get_etc_protocols();
1053
1054     my ($type, $action, $iface, $source, $dest, $proto, $dport, $sport);
1055
1056     # we can add single line comments to the end of the rule
1057     my $comment = $1 if $line =~ s/#\s*(.*?)\s*$//;
1058
1059     # we can disable a rule when prefixed with '|'
1060     my $disable = 1 if  $line =~ s/^\|//;
1061
1062     my @data = split(/\s+/, $line);
1063     my $expected_elements = $need_iface ? 8 : 7;
1064
1065     die "wrong number of rule elements\n" if scalar(@data) > $expected_elements;
1066
1067     if ($need_iface) {
1068         ($type, $action, $iface, $source, $dest, $proto, $dport, $sport) = @data
1069     } else {
1070         ($type, $action, $source, $dest, $proto, $dport, $sport) =  @data;
1071     }
1072
1073     die "incomplete rule\n" if ! ($type && $action);
1074
1075     my $macro;
1076     my $macro_name;
1077
1078     $type = lc($type);
1079
1080     if ($type eq  'in' || $type eq 'out') {
1081         if ($action =~ m/^(ACCEPT|DROP|REJECT)$/) {
1082             # OK
1083         } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
1084             ($macro_name, $action) = ($1, $2);
1085             my $lc_macro_name = lc($macro_name);
1086             my $preferred_name = $pve_fw_preferred_macro_names->{$lc_macro_name};
1087             $macro_name = $preferred_name if $preferred_name;
1088             $macro = $macros->{$lc_macro_name};
1089             die "unknown macro '$macro_name'\n" if !$macro;
1090         } else {
1091             die "unknown action '$action'\n";
1092         }
1093     } elsif ($type eq 'group') {
1094         die "wrong number of rule elements\n" if scalar(@data) != 3;
1095         die "groups disabled\n" if !$allow_groups;
1096
1097         die "invalid characters in group name\n" if $action !~ m/^[A-Za-z0-9_\-]+$/;
1098     } else {
1099         die "unknown rule type '$type'\n";
1100     }
1101
1102     if ($need_iface) {
1103         $iface = undef if $iface && $iface eq '-';
1104         die "unknown interface '$iface'\n"
1105             if defined($iface) && !$valid_netdev_names->{$iface};
1106     }
1107
1108     $proto = undef if $proto && $proto eq '-';
1109     die "unknown protokol '$proto'\n" if $proto &&
1110         !(defined($protocols->{byname}->{$proto}) ||
1111           defined($protocols->{byid}->{$proto}));
1112
1113     $source = undef if $source && $source eq '-';
1114     $dest = undef if $dest && $dest eq '-';
1115
1116     $dport = undef if $dport && $dport eq '-';
1117     $sport = undef if $sport && $sport eq '-';
1118
1119     my $nbsource = undef;
1120     my $nbdest = undef;
1121
1122     $nbsource = parse_address_list($source) if $source;
1123     $nbdest = parse_address_list($dest) if $dest;
1124
1125     my $rules = [];
1126
1127     my $param = {
1128         type => $type,
1129         disable => $disable,
1130         comment => $comment,
1131         action => $action,
1132         iface => $iface,
1133         source => $source,
1134         dest => $dest,
1135         nbsource => $nbsource,
1136         nbdest => $nbdest,
1137         proto => $proto,
1138         dport => $dport,
1139         sport => $sport,
1140     };
1141
1142     if ($macro) {
1143         foreach my $templ (@$macro) {
1144             my $rule = {};
1145             my $param_used = {};
1146             foreach my $k (keys %$templ) {
1147                 my $v = $templ->{$k};
1148                 if ($v eq 'PARAM') {
1149                     $v = $param->{$k};
1150                     $param_used->{$k} = 1;
1151                 } elsif ($v eq 'DEST') {
1152                     $v = $param->{dest};
1153                     $param_used->{dest} = 1;
1154                 } elsif ($v eq 'SOURCE') {
1155                     $v = $param->{source};
1156                     $param_used->{source} = 1;
1157                 }
1158
1159                 die "missing parameter '$k' in macro '$macro_name'\n" if !defined($v);
1160                 $rule->{$k} = $v;
1161             }
1162             foreach my $k (keys %$param) {
1163                 next if !defined($param->{$k});
1164                 next if $param_used->{$k};
1165                 if (defined($rule->{$k})) {
1166                     die "parameter '$k' already define in macro (value = '$rule->{$k}')\n"
1167                         if $rule->{$k} ne $param->{$k};
1168                 } else {
1169                     $rule->{$k} = $param->{$k};
1170                 }
1171             }
1172             push @$rules, $rule;
1173         }
1174     } else {
1175         push @$rules, $param;
1176     }
1177
1178     foreach my $rule (@$rules) {
1179         $rule->{nbdport} = parse_port_name_number_or_range($rule->{dport})
1180             if defined($rule->{dport});
1181         $rule->{nbsport} = parse_port_name_number_or_range($rule->{sport})
1182             if defined($rule->{sport});
1183     }
1184
1185     return $rules;
1186 }
1187
1188 sub parse_vmfw_option {
1189     my ($line) = @_;
1190
1191     my ($opt, $value);
1192
1193     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1194
1195     if ($line =~ m/^(enable|dhcp|macfilter|nosmurfs|tcpflags):\s*(0|1)\s*$/i) {
1196         $opt = lc($1);
1197         $value = int($2);
1198     } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
1199         $opt = lc($1);
1200         $value = $2 ? lc($3) : '';
1201     } elsif ($line =~ m/^(policy-(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1202         $opt = lc($1);
1203         $value = uc($3);
1204     } else {
1205         chomp $line;
1206         die "can't parse option '$line'\n"
1207     }
1208
1209     return ($opt, $value);
1210 }
1211
1212 sub parse_hostfw_option {
1213     my ($line) = @_;
1214
1215     my ($opt, $value);
1216
1217     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1218
1219     if ($line =~ m/^(enable|dhcp|nosmurfs|tcpflags):\s*(0|1)\s*$/i) {
1220         $opt = lc($1);
1221         $value = int($2);
1222     } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
1223         $opt = lc($1);
1224         $value = $2 ? lc($3) : '';
1225     } elsif ($line =~ m/^(policy-(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1226         $opt = lc($1);
1227         $value = uc($3);
1228     } else {
1229         chomp $line;
1230         die "can't parse option '$line'\n"
1231     }
1232
1233     return ($opt, $value);
1234 }
1235
1236 sub parse_vm_fw_rules {
1237     my ($filename, $fh) = @_;
1238
1239     my $res = { rules => [], options => {}};
1240
1241     my $section;
1242
1243     while (defined(my $line = <$fh>)) {
1244         next if $line =~ m/^#/;
1245         next if $line =~ m/^\s*$/;
1246
1247         my $linenr = $fh->input_line_number();
1248         my $prefix = "$filename (line $linenr)";
1249
1250         if ($line =~ m/^\[(\S+)\]\s*$/i) {
1251             $section = lc($1);
1252             warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1253             next;
1254         }
1255         if (!$section) {
1256             warn "$prefix: skip line - no section";
1257             next;
1258         }
1259
1260         next if !$res->{$section}; # skip undefined section
1261
1262         if ($section eq 'options') {
1263             eval {
1264                 my ($opt, $value) = parse_vmfw_option($line);
1265                 $res->{options}->{$opt} = $value;
1266             };
1267             warn "$prefix: $@" if $@;
1268             next;
1269         }
1270
1271         my $rules;
1272         eval { $rules = parse_fw_rule($line, 1, 1); };
1273         if (my $err = $@) {
1274             warn "$prefix: $err";
1275             next;
1276         }
1277
1278         push @{$res->{$section}}, @$rules;
1279     }
1280
1281     return $res;
1282 }
1283
1284 sub parse_host_fw_rules {
1285     my ($filename, $fh) = @_;
1286
1287     my $res = { rules => [], options => {}};
1288
1289     my $section;
1290
1291     while (defined(my $line = <$fh>)) {
1292         next if $line =~ m/^#/;
1293         next if $line =~ m/^\s*$/;
1294
1295         my $linenr = $fh->input_line_number();
1296         my $prefix = "$filename (line $linenr)";
1297
1298         if ($line =~ m/^\[(\S+)\]\s*$/i) {
1299             $section = lc($1);
1300             warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1301             next;
1302         }
1303         if (!$section) {
1304             warn "$prefix: skip line - no section";
1305             next;
1306         }
1307
1308         next if !$res->{$section}; # skip undefined section
1309
1310         if ($section eq 'options') {
1311             eval {
1312                 my ($opt, $value) = parse_hostfw_option($line);
1313                 $res->{options}->{$opt} = $value;
1314             };
1315             warn "$prefix: $@" if $@;
1316             next;
1317         }
1318
1319         my $rules;
1320         eval { $rules = parse_fw_rule($line, 1, 1); };
1321         if (my $err = $@) {
1322             warn "$prefix: $err";
1323             next;
1324         }
1325
1326         push @{$res->{$section}}, @$rules;
1327     }
1328
1329     return $res;
1330 }
1331
1332 sub parse_group_fw_rules {
1333     my ($filename, $fh) = @_;
1334
1335     my $section;
1336     my $group;
1337
1338     my $res = { rules => [] };
1339
1340     while (defined(my $line = <$fh>)) {
1341         next if $line =~ m/^#/;
1342         next if $line =~ m/^\s*$/;
1343
1344         my $linenr = $fh->input_line_number();
1345         my $prefix = "$filename (line $linenr)";
1346
1347         if ($line =~ m/^\[group\s+(\S+)\]\s*$/i) {
1348             $section = 'rules';
1349             $group = lc($1);
1350             next;
1351         }
1352         if (!$section || !$group) {
1353             warn "$prefix: skip line - no section";
1354             next;
1355         }
1356
1357         my $rules;
1358         eval { $rules = parse_fw_rule($line, 0, 0); };
1359         if (my $err = $@) {
1360             warn "$prefix: $err";
1361             next;
1362         }
1363
1364         push @{$res->{$group}->{$section}}, @$rules;
1365     }
1366
1367     return $res;
1368 }
1369
1370 sub run_locked {
1371     my ($code, @param) = @_;
1372
1373     my $timeout = 10;
1374
1375     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
1376
1377     die $@ if $@;
1378
1379     return $res;
1380 }
1381
1382 sub read_local_vm_config {
1383
1384     my $openvz = {};
1385
1386     my $qemu = {};
1387
1388     my $list = PVE::QemuServer::config_list();
1389
1390     foreach my $vmid (keys %$list) {
1391         my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
1392         if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
1393             $qemu->{$vmid} = $conf;
1394         }
1395     }
1396
1397     my $vmdata = { openvz => $openvz, qemu => $qemu };
1398
1399     return $vmdata;
1400 };
1401
1402 sub read_vm_firewall_rules {
1403     my ($vmdata) = @_;
1404     my $rules = {};
1405     foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
1406         my $filename = "/etc/pve/firewall/$vmid.fw";
1407         my $fh = IO::File->new($filename, O_RDONLY);
1408         next if !$fh;
1409
1410         $rules->{$vmid} = parse_vm_fw_rules($filename, $fh);
1411     }
1412
1413     return $rules;
1414 }
1415
1416 sub get_option_log_level {
1417     my ($options, $k) = @_;
1418
1419     my $v = $options->{$k};
1420     $v = $default_log_level if !defined($v);
1421
1422     return undef if $v eq '' || $v eq 'nolog';
1423
1424     $v = $log_level_hash->{$v} if defined($log_level_hash->{$v});
1425
1426     return $v if ($v >= 0) && ($v <= 7);
1427
1428     warn "unknown log level ($k = '$v')\n";
1429
1430     return undef;
1431 }
1432
1433 sub generate_std_chains {
1434     my ($ruleset, $options) = @_;
1435
1436     my $loglevel = get_option_log_level($options, 'smurf_log_level');
1437
1438     # same as shorewall smurflog.
1439     if (defined($loglevel)) {
1440         $pve_std_chains-> {'PVEFW-smurflog'} = [
1441             "-j LOG --log-prefix \"smurfs-dropped\" --log-level $loglevel",
1442             "-j DROP",
1443             ];
1444     } else {
1445         $pve_std_chains-> {'PVEFW-smurflog'} = [ "-j DROP" ];
1446     }
1447
1448     # same as shorewall logflags action.
1449     $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
1450     if (defined($loglevel)) {
1451         $pve_std_chains-> {'PVEFW-logflags'} = [
1452             "-j LOG --log-prefix \"logflags-dropped:\" --log-level $loglevel --log-ip-options",
1453             "-j DROP",
1454             ];
1455     } else {
1456         $pve_std_chains-> {'PVEFW-logflags'} = [ "-j DROP" ];
1457     }
1458
1459     foreach my $chain (keys %$pve_std_chains) {
1460         ruleset_create_chain($ruleset, $chain);
1461         foreach my $rule (@{$pve_std_chains->{$chain}}) {
1462             if (ref($rule)) {
1463                 ruleset_generate_rule($ruleset, $chain, $rule);
1464             } else {
1465                 ruleset_addrule($ruleset, $chain, $rule);
1466             }
1467         }
1468     }
1469 }
1470
1471 sub save_pvefw_status {
1472     my ($status) = @_;
1473
1474     die "unknown status '$status' - internal error"
1475         if $status !~ m/^(stopped|active)$/;
1476
1477     mkdir dirname($pve_fw_status_filename);
1478     PVE::Tools::file_set_contents($pve_fw_status_filename, $status);
1479 }
1480
1481 sub read_pvefw_status {
1482
1483     my $status = 'unknown';
1484
1485     return 'stopped' if ! -f $pve_fw_status_filename;
1486
1487     eval {
1488         $status = PVE::Tools::file_get_contents($pve_fw_status_filename);
1489     };
1490     warn $@ if $@;
1491
1492     return $status;
1493 }
1494
1495 sub compile {
1496     my $vmdata = read_local_vm_config();
1497     my $rules = read_vm_firewall_rules($vmdata);
1498
1499     my $groups_conf = {};
1500     my $filename = "/etc/pve/firewall/groups.fw";
1501     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1502         $groups_conf = parse_group_fw_rules($filename, $fh);
1503     }
1504
1505     #print Dumper($rules);
1506
1507     my $ruleset = {};
1508
1509     ruleset_create_chain($ruleset, "PVEFW-INPUT");
1510     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
1511     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
1512
1513     my $hostfw_options = {};
1514     my $hostfw_conf;
1515
1516     $filename = "/etc/pve/local/host.fw";
1517     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1518         $hostfw_conf = parse_host_fw_rules($filename, $fh);
1519         $hostfw_options = $hostfw_conf->{options};
1520     }
1521
1522     generate_std_chains($ruleset, $hostfw_options);
1523
1524     my $hostfw_enable = $hostfw_conf &&
1525         !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
1526
1527     enablehostfw($ruleset, $hostfw_conf, $groups_conf) if $hostfw_enable;
1528
1529     # generate firewall rules for QEMU VMs
1530     foreach my $vmid (keys %{$vmdata->{qemu}}) {
1531         my $conf = $vmdata->{qemu}->{$vmid};
1532         my $vmfw_conf = $rules->{$vmid};
1533         next if !$vmfw_conf;
1534         next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
1535
1536         foreach my $netid (keys %$conf) {
1537             next if $netid !~ m/^net(\d+)$/;
1538             my $net = PVE::QemuServer::parse_net($conf->{$netid});
1539             next if !$net;
1540             my $iface = "tap${vmid}i$1";
1541
1542             my $bridge = $net->{bridge};
1543             next if !$bridge; # fixme: ?
1544
1545             $bridge .= "v$net->{tag}" if $net->{tag};
1546
1547             generate_bridge_chains($ruleset, $bridge);
1548
1549             my $macaddr = $net->{macaddr};
1550             generate_tap_rules_direction($ruleset, $groups_conf, $iface, $netid, $macaddr, $vmfw_conf, $bridge, 'IN');
1551             generate_tap_rules_direction($ruleset, $groups_conf, $iface, $netid, $macaddr, $vmfw_conf, $bridge, 'OUT');
1552         }
1553     }
1554
1555     if ($hostfw_enable) {
1556         # allow traffic from lo (ourself)
1557         ruleset_addrule($ruleset, "PVEFW-INPUT", "-i lo -j ACCEPT");
1558     }
1559
1560     return $ruleset;
1561 }
1562
1563 sub get_ruleset_status {
1564     my ($ruleset, $verbose) = @_;
1565
1566     my $active_chains = iptables_get_chains();
1567
1568     my $statushash = {};
1569
1570     foreach my $chain (sort keys %$ruleset) {
1571         my $digest = Digest::SHA->new('sha1');
1572         foreach my $cmd (@{$ruleset->{$chain}}) {
1573              $digest->add("$cmd\n");
1574         }
1575         my $sig = $digest->b64digest;
1576         $statushash->{$chain}->{sig} = $sig;
1577
1578         my $oldsig = $active_chains->{$chain};
1579         if (!defined($oldsig)) {
1580             $statushash->{$chain}->{action} = 'create';
1581         } else {
1582             if ($oldsig eq $sig) {
1583                 $statushash->{$chain}->{action} = 'exists';
1584             } else {
1585                 $statushash->{$chain}->{action} = 'update';
1586             }
1587         }
1588         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
1589         foreach my $cmd (@{$ruleset->{$chain}}) {
1590             print "\t$cmd\n" if $verbose;
1591         }
1592     }
1593
1594     foreach my $chain (sort keys %$active_chains) {
1595         if (!defined($ruleset->{$chain})) {
1596             my $sig = $active_chains->{$chain};
1597             $statushash->{$chain}->{action} = 'delete';
1598             $statushash->{$chain}->{sig} = $sig;
1599             print "delete $chain ($sig)\n" if $verbose;
1600         }
1601     }
1602
1603     return $statushash;
1604 }
1605
1606 sub print_ruleset {
1607     my ($ruleset) = @_;
1608
1609     get_ruleset_status($ruleset, 1);
1610 }
1611
1612 sub print_sig_rule {
1613     my ($chain, $sig) = @_;
1614
1615     # We just use this to store a SHA1 checksum used to detect changes
1616     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
1617 }
1618
1619 sub get_rulset_cmdlist {
1620     my ($ruleset, $verbose) = @_;
1621
1622     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
1623
1624     my $statushash = get_ruleset_status($ruleset, $verbose);
1625
1626     # create missing chains first
1627     foreach my $chain (sort keys %$ruleset) {
1628         my $stat = $statushash->{$chain};
1629         die "internal error" if !$stat;
1630         next if $stat->{action} ne 'create';
1631
1632         $cmdlist .= ":$chain - [0:0]\n";
1633     }
1634
1635     my $rule = "INPUT -j PVEFW-INPUT";
1636     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1637         $cmdlist .= "-A $rule\n";
1638     }
1639     $rule = "OUTPUT -j PVEFW-OUTPUT";
1640     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1641         $cmdlist .= "-A $rule\n";
1642     }
1643
1644     $rule = "FORWARD -j PVEFW-FORWARD";
1645     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1646         $cmdlist .= "-A $rule\n";
1647     }
1648
1649     foreach my $chain (sort keys %$ruleset) {
1650         my $stat = $statushash->{$chain};
1651         die "internal error" if !$stat;
1652
1653         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
1654             $cmdlist .= "-F $chain\n";
1655             foreach my $cmd (@{$ruleset->{$chain}}) {
1656                 $cmdlist .= "$cmd\n";
1657             }
1658             $cmdlist .= print_sig_rule($chain, $stat->{sig});
1659         } elsif ($stat->{action} eq 'delete') {
1660             die "internal error"; # this should not happen
1661         } elsif ($stat->{action} eq 'exists') {
1662             # do nothing
1663         } else {
1664             die "internal error - unknown status '$stat->{action}'";
1665         }
1666     }
1667
1668     foreach my $chain (keys %$statushash) {
1669         next if $statushash->{$chain}->{action} ne 'delete';
1670         $cmdlist .= "-F $chain\n";
1671     }
1672     foreach my $chain (keys %$statushash) {
1673         next if $statushash->{$chain}->{action} ne 'delete';
1674         next if $chain eq 'PVEFW-INPUT';
1675         next if $chain eq 'PVEFW-OUTPUT';
1676         next if $chain eq 'PVEFW-FORWARD';
1677         $cmdlist .= "-X $chain\n";
1678     }
1679
1680     $cmdlist .= "COMMIT\n";
1681
1682     return $cmdlist;
1683 }
1684
1685 sub apply_ruleset {
1686     my ($ruleset, $verbose) = @_;
1687
1688     enable_bridge_firewall();
1689
1690     my $cmdlist = get_rulset_cmdlist($ruleset, $verbose);
1691
1692     print $cmdlist if $verbose;
1693
1694     iptables_restore_cmdlist($cmdlist);
1695
1696     # test: re-read status and check if everything is up to date
1697     my $statushash = get_ruleset_status($ruleset);
1698
1699     my $errors;
1700     foreach my $chain (sort keys %$ruleset) {
1701         my $stat = $statushash->{$chain};
1702         if ($stat->{action} ne 'exists') {
1703             warn "unable to update chain '$chain'\n";
1704             $errors = 1;
1705         }
1706     }
1707
1708     die "unable to apply firewall changes\n" if $errors;
1709 }
1710
1711 sub update {
1712     my ($start, $verbose) = @_;
1713
1714     my $code = sub {
1715         my $status = read_pvefw_status();
1716
1717         my $ruleset = PVE::Firewall::compile();
1718
1719         if ($start || $status eq 'active') {
1720
1721             save_pvefw_status('active') if ($status ne 'active');
1722
1723             PVE::Firewall::apply_ruleset($ruleset, $verbose);
1724         } else {
1725             print "Firewall not active (status = $status)\n" if $verbose;
1726         }
1727     };
1728
1729     run_locked($code);
1730 }
1731
1732
1733 1;