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     $cmd .= " -m iprange --src-range" if $rule->{nbsource} && $rule->{nbsource} > 1;
 727     $cmd .= " -s $rule->{source}" if $rule->{source};
 728     $cmd .= " -m iprange --dst-range" if $rule->{nbdest} && $rule->{nbdest} > 1;
 729     $cmd .= " -d $rule->{dest}" if $rule->{dest};
 730
 731     if ($rule->{proto}) {
 732         $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         $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                 $cmd .= " -m icmp --icmp-type $rule->{dport}";
 748             } else {
 749                 if ($rule->{nbdport} && $rule->{nbdport} > 1) {
 750                     if ($multiport == 2) {
 751                         $cmd .= " --ports $rule->{dport}";
 752                     } else {
 753                         $cmd .= " --dports $rule->{dport}";
 754                     }
 755                 } else {
 756                     $cmd .= " --dport $rule->{dport}";
 757                 }
 758             }
 759         }
 760
 761         if ($rule->{sport}) {
 762             if ($rule->{nbsport} && $rule->{nbsport} > 1) {
 763                 $cmd .= " --sports $rule->{sport}" if $multiport != 2;
 764             } else {
 765                 $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     $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         $cmd .= $goto ? " -g $action" : " -j $action";
 779     }
 780
 781     ruleset_addrule($ruleset, $chain, $cmd) if $cmd;
 782 }
 783
 784 sub ruleset_create_chain {
 785     my ($ruleset, $chain) = @_;
 786
 787     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
 788
 789     die "chain '$chain' already exists\n" if $ruleset->{$chain};
 790
 791     $ruleset->{$chain} = [];
 792 }
 793
 794 sub ruleset_chain_exist {
 795     my ($ruleset, $chain) = @_;
 796
 797     return $ruleset->{$chain} ? 1 : undef;
 798 }
 799
 800 sub ruleset_addrule {
 801    my ($ruleset, $chain, $rule) = @_;
 802
 803    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 804
 805    push @{$ruleset->{$chain}}, "-A $chain $rule";
 806 }
 807
 808 sub ruleset_insertrule {
 809    my ($ruleset, $chain, $rule) = @_;
 810
 811    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 812
 813    unshift @{$ruleset->{$chain}}, "-A $chain $rule";
 814 }
 815
 816 sub generate_bridge_chains {
 817     my ($ruleset, $bridge) = @_;
 818
 819     if (!ruleset_chain_exist($ruleset, "PVEFW-FORWARD")){
 820         ruleset_create_chain($ruleset, "PVEFW-FORWARD");
 821         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 822     }
 823
 824     if (!ruleset_chain_exist($ruleset, "$bridge-FW")) {
 825         ruleset_create_chain($ruleset, "$bridge-FW");
 826         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -m physdev --physdev-is-bridged -j $bridge-FW");
 827         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -m physdev --physdev-is-bridged -j $bridge-FW");
 828         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -j DROP");  # disable interbridge routing
 829         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -j DROP"); # disable interbridge routing
 830     }
 831
 832     if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) {
 833         ruleset_create_chain($ruleset, "$bridge-OUT");
 834         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-in -j $bridge-OUT");
 835     }
 836
 837     if (!ruleset_chain_exist($ruleset, "$bridge-IN")) {
 838         ruleset_create_chain($ruleset, "$bridge-IN");
 839         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-out -j $bridge-IN");
 840         ruleset_addrule($ruleset, "$bridge-FW", "-m mark --mark 1 -j ACCEPT");
 841         # accept traffic to unmanaged bridge ports
 842         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-bridged --physdev-is-out -j ACCEPT ");
 843     }
 844 }
 845
 846 sub generate_tap_rules_direction {
 847     my ($ruleset, $group_rules, $iface, $netid, $macaddr, $vmfw_conf, $bridge, $direction) = @_;
 848
 849     my $lc_direction = lc($direction);
 850     my $rules = $vmfw_conf->{$lc_direction};
 851
 852     my $options = $vmfw_conf->{options};
 853     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
 854
 855     my $tapchain = "$iface-$direction";
 856
 857     ruleset_create_chain($ruleset, $tapchain);
 858
 859     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
 860         ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
 861     }
 862
 863     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
 864         ruleset_addrule($ruleset, $tapchain, "-p udp -m udp --dport 67:68 -j ACCEPT");
 865     }
 866
 867     if ($options->{tcpflags}) {
 868         ruleset_addrule($ruleset, $tapchain, "-p tcp -j PVEFW-tcpflags");
 869     }
 870
 871     ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate INVALID -j DROP");
 872     ruleset_addrule($ruleset, $tapchain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 873
 874     if ($direction eq 'OUT' && defined($macaddr) &&
 875         !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
 876         ruleset_addrule($ruleset, $tapchain, "-m mac ! --mac-source $macaddr -j DROP");
 877     }
 878
 879     if ($rules) {
 880         foreach my $rule (@$rules) {
 881             next if $rule->{iface} && $rule->{iface} ne $netid;
 882             # we go to $bridge-IN if accept in out rules
 883             if($rule->{action}  =~ m/^(GROUP-(\S+))$/){
 884                 $rule->{action} .= "-$direction";
 885                 # generate empty group rule if don't exist
 886                 if(!ruleset_chain_exist($ruleset, $rule->{action})){
 887                     generate_group_rules($ruleset, $group_rules, $2);
 888                 }
 889                 ruleset_generate_rule($ruleset, $tapchain, $rule);
 890                 ruleset_addrule($ruleset, $tapchain, "-m mark --mark 1 -j RETURN")
 891                     if $direction eq 'OUT';
 892             } else {
 893                 if ($direction eq 'OUT') {
 894                     ruleset_generate_rule($ruleset, $tapchain, $rule,
 895                                           { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
 896                 } else {
 897                     ruleset_generate_rule($ruleset, $tapchain, $rule, { REJECT => "PVEFW-reject" });
 898                 }
 899             }
 900         }
 901     }
 902
 903     # implement policy
 904     my $policy;
 905
 906     if ($direction eq 'OUT') {
 907         $policy = $options->{'policy-out'} || 'ACCEPT'; # allow everything by default
 908     } else {
 909         $policy = $options->{'policy-in'} || 'DROP'; # allow everything by default
 910     }
 911
 912     if ($policy eq 'ACCEPT') {
 913         if ($direction eq 'OUT') {
 914             ruleset_addrule($ruleset, $tapchain, "-g PVEFW-SET-ACCEPT-MARK");
 915         } else {
 916             ruleset_addrule($ruleset, $tapchain, "-j ACCEPT");
 917         }
 918     } elsif ($policy eq 'DROP') {
 919
 920         ruleset_addrule($ruleset, $tapchain, "-j PVEFW-Drop");
 921
 922         ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-dropped: \" --log-level $loglevel")
 923             if defined($loglevel);
 924
 925         ruleset_addrule($ruleset, $tapchain, "-j DROP");
 926     } elsif ($policy eq 'REJECT') {
 927         ruleset_addrule($ruleset, $tapchain, "-j PVEFW-Reject");
 928
 929         ruleset_addrule($ruleset, $tapchain, "-j LOG --log-prefix \"$tapchain-reject: \" --log-level $loglevel")
 930             if defined($loglevel);
 931
 932         ruleset_addrule($ruleset, $tapchain, "-g PVEFW-reject");
 933     } else {
 934         # should not happen
 935         die "internal error: unknown policy '$policy'";
 936     }
 937
 938     # plug the tap chain to bridge chain
 939     my $physdevdirection = $direction eq 'IN' ? "out" : "in";
 940     my $rule = "-m physdev --physdev-$physdevdirection $iface --physdev-is-bridged -j $tapchain";
 941     ruleset_insertrule($ruleset, "$bridge-$direction", $rule);
 942
 943     if ($direction eq 'OUT'){
 944         # add tap->host rules
 945         my $rule = "-m physdev --physdev-$physdevdirection $iface -j $tapchain";
 946         ruleset_addrule($ruleset, "PVEFW-INPUT", $rule);
 947     }
 948 }
 949
 950 sub enablehostfw {
 951     my ($ruleset, $rules, $group_rules) = @_;
 952
 953     # fixme: allow security groups
 954
 955     my $options = $rules->{options};
 956
 957     # host inbound firewall
 958     my $chain = "PVEFW-HOST-IN";
 959     ruleset_create_chain($ruleset, $chain);
 960
 961     my $loglevel = get_option_log_level($options, "log_level_in");
 962
 963     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
 964     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 965     ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
 966     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 967     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW -m multiport --dports 5404,5405 -j ACCEPT");
 968     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT");  #corosync
 969
 970     if ($rules->{in}) {
 971         foreach my $rule (@{$rules->{in}}) {
 972             # we use RETURN because we need to check also tap rules
 973             ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => 'RETURN', REJECT => "PVEFW-reject" });
 974         }
 975     }
 976
 977     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-IN dropped: \" --log-level $loglevel")
 978         if defined($loglevel);
 979
 980     ruleset_addrule($ruleset, $chain, "-j DROP");
 981
 982     # host outbound firewall
 983     $chain = "PVEFW-HOST-OUT";
 984     ruleset_create_chain($ruleset, $chain);
 985
 986     $loglevel = get_option_log_level($options, "log_level_out");
 987
 988     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
 989     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 990     ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
 991     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
 992     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW -m multiport --dports 5404,5405 -j ACCEPT");
 993     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
 994
 995     if ($rules->{out}) {
 996         foreach my $rule (@{$rules->{out}}) {
 997             # we use RETURN because we need to check also tap rules
 998             ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => 'RETURN', REJECT => "PVEFW-reject" });
 999         }
1000     }
1001
1002     ruleset_addrule($ruleset, $chain, "-j LOG --log-prefix \"kvmhost-OUT dropped: \" --log-level $loglevel")
1003         if defined($loglevel);
1004
1005     ruleset_addrule($ruleset, $chain, "-j DROP");
1006
1007     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
1008     ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
1009 }
1010
1011 sub generate_group_rules {
1012     my ($ruleset, $group_rules, $group) = @_;
1013
1014     my $rules = $group_rules->{$group};
1015
1016     die "no such security group '$group'\n" if !$rules;
1017
1018     my $chain = "GROUP-${group}-IN";
1019
1020     ruleset_create_chain($ruleset, $chain);
1021
1022     if ($rules->{in}) {
1023         foreach my $rule (@{$rules->{in}}) {
1024             ruleset_generate_rule($ruleset, $chain, $rule, { REJECT => "PVEFW-reject" });
1025         }
1026     }
1027
1028     $chain = "GROUP-${group}-OUT";
1029
1030     ruleset_create_chain($ruleset, $chain);
1031     ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1032
1033     if ($rules->{out}) {
1034         foreach my $rule (@{$rules->{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
1043 my $MAX_NETS = 32;
1044 my $valid_netdev_names = {};
1045 for (my $i = 0; $i < $MAX_NETS; $i++)  {
1046     $valid_netdev_names->{"net$i"} = 1;
1047 }
1048
1049 sub parse_fw_rule {
1050     my ($line, $need_iface, $allow_groups) = @_;
1051
1052     my $macros = get_firewall_macros();
1053     my $protocols = get_etc_protocols();
1054
1055     my ($action, $iface, $source, $dest, $proto, $dport, $sport);
1056
1057     # we can add single line comments to the end of the rule
1058     my $comment = $1 if $line =~ s/#\s*(.*?)\s*$//;
1059
1060     # we can disable a rule when prefixed with '|'
1061     my $disable = 1 if  $line =~ s/^\|//;
1062
1063     my @data = split(/\s+/, $line);
1064     my $expected_elements = $need_iface ? 7 : 6;
1065
1066     die "wrong number of rule elements\n" if scalar(@data) > $expected_elements;
1067
1068     if ($need_iface) {
1069         ($action, $iface, $source, $dest, $proto, $dport, $sport) = @data
1070     } else {
1071         ($action, $source, $dest, $proto, $dport, $sport) =  @data;
1072     }
1073
1074     die "incomplete rule\n" if !$action;
1075
1076     my $macro;
1077     my $macro_name;
1078
1079     if ($action =~ m/^(ACCEPT|DROP|REJECT)$/) {
1080         # OK
1081     } elsif ($allow_groups && $action =~ m/^GROUP-(:?\S+)$/) {
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 '$action'\n";
1092     }
1093
1094     if ($need_iface) {
1095         $iface = undef if $iface && $iface eq '-';
1096         die "unknown interface '$iface'\n"
1097             if defined($iface) && !$valid_netdev_names->{$iface};
1098     }
1099
1100     $proto = undef if $proto && $proto eq '-';
1101     die "unknown protokol '$proto'\n" if $proto &&
1102         !(defined($protocols->{byname}->{$proto}) ||
1103           defined($protocols->{byid}->{$proto}));
1104
1105     $source = undef if $source && $source eq '-';
1106     $dest = undef if $dest && $dest eq '-';
1107
1108     $dport = undef if $dport && $dport eq '-';
1109     $sport = undef if $sport && $sport eq '-';
1110
1111     my $nbsource = undef;
1112     my $nbdest = undef;
1113
1114     $nbsource = parse_address_list($source) if $source;
1115     $nbdest = parse_address_list($dest) if $dest;
1116
1117     my $rules = [];
1118
1119     my $param = {
1120         disable => $disable,
1121         comment => $comment,
1122         action => $action,
1123         iface => $iface,
1124         source => $source,
1125         dest => $dest,
1126         nbsource => $nbsource,
1127         nbdest => $nbdest,
1128         proto => $proto,
1129         dport => $dport,
1130         sport => $sport,
1131     };
1132
1133     if ($macro) {
1134         foreach my $templ (@$macro) {
1135             my $rule = {};
1136             my $param_used = {};
1137             foreach my $k (keys %$templ) {
1138                 my $v = $templ->{$k};
1139                 if ($v eq 'PARAM') {
1140                     $v = $param->{$k};
1141                     $param_used->{$k} = 1;
1142                 } elsif ($v eq 'DEST') {
1143                     $v = $param->{dest};
1144                     $param_used->{dest} = 1;
1145                 } elsif ($v eq 'SOURCE') {
1146                     $v = $param->{source};
1147                     $param_used->{source} = 1;
1148                 }
1149
1150                 die "missing parameter '$k' in macro '$macro_name'\n" if !defined($v);
1151                 $rule->{$k} = $v;
1152             }
1153             foreach my $k (keys %$param) {
1154                 next if !defined($param->{$k});
1155                 next if $param_used->{$k};
1156                 if (defined($rule->{$k})) {
1157                     die "parameter '$k' already define in macro (value = '$rule->{$k}')\n"
1158                         if $rule->{$k} ne $param->{$k};
1159                 } else {
1160                     $rule->{$k} = $param->{$k};
1161                 }
1162             }
1163             push @$rules, $rule;
1164         }
1165     } else {
1166         push @$rules, $param;
1167     }
1168
1169     foreach my $rule (@$rules) {
1170         $rule->{nbdport} = parse_port_name_number_or_range($rule->{dport})
1171             if defined($rule->{dport});
1172         $rule->{nbsport} = parse_port_name_number_or_range($rule->{sport})
1173             if defined($rule->{sport});
1174     }
1175
1176     return $rules;
1177 }
1178
1179 sub parse_vmfw_option {
1180     my ($line) = @_;
1181
1182     my ($opt, $value);
1183
1184     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1185
1186     if ($line =~ m/^(enable|dhcp|macfilter|nosmurfs|tcpflags):\s*(0|1)\s*$/i) {
1187         $opt = lc($1);
1188         $value = int($2);
1189     } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
1190         $opt = lc($1);
1191         $value = $2 ? lc($3) : '';
1192     } elsif ($line =~ m/^(policy-(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1193         $opt = lc($1);
1194         $value = uc($3);
1195     } else {
1196         chomp $line;
1197         die "can't parse option '$line'\n"
1198     }
1199
1200     return ($opt, $value);
1201 }
1202
1203 sub parse_hostfw_option {
1204     my ($line) = @_;
1205
1206     my ($opt, $value);
1207
1208     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1209
1210     if ($line =~ m/^(enable|dhcp|nosmurfs|tcpflags):\s*(0|1)\s*$/i) {
1211         $opt = lc($1);
1212         $value = int($2);
1213     } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
1214         $opt = lc($1);
1215         $value = $2 ? lc($3) : '';
1216     } elsif ($line =~ m/^(policy-(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1217         $opt = lc($1);
1218         $value = uc($3);
1219     } else {
1220         chomp $line;
1221         die "can't parse option '$line'\n"
1222     }
1223
1224     return ($opt, $value);
1225 }
1226
1227 sub parse_vm_fw_rules {
1228     my ($filename, $fh) = @_;
1229
1230     my $res = { in => [], out => [], options => {}};
1231
1232     my $section;
1233
1234     while (defined(my $line = <$fh>)) {
1235         next if $line =~ m/^#/;
1236         next if $line =~ m/^\s*$/;
1237
1238         my $linenr = $fh->input_line_number();
1239         my $prefix = "$filename (line $linenr)";
1240
1241         if ($line =~ m/^\[(\S+)\]\s*$/i) {
1242             $section = lc($1);
1243             warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1244             next;
1245         }
1246         if (!$section) {
1247             warn "$prefix: skip line - no section";
1248             next;
1249         }
1250
1251         next if !$res->{$section}; # skip undefined section
1252
1253         if ($section eq 'options') {
1254             eval {
1255                 my ($opt, $value) = parse_vmfw_option($line);
1256                 $res->{options}->{$opt} = $value;
1257             };
1258             warn "$prefix: $@" if $@;
1259             next;
1260         }
1261
1262         my $rules;
1263         eval { $rules = parse_fw_rule($line, 1, 1); };
1264         if (my $err = $@) {
1265             warn "$prefix: $err";
1266             next;
1267         }
1268
1269         push @{$res->{$section}}, @$rules;
1270     }
1271
1272     return $res;
1273 }
1274
1275 sub parse_host_fw_rules {
1276     my ($filename, $fh) = @_;
1277
1278     my $res = { in => [], out => [], options => {}};
1279
1280     my $section;
1281
1282     while (defined(my $line = <$fh>)) {
1283         next if $line =~ m/^#/;
1284         next if $line =~ m/^\s*$/;
1285
1286         my $linenr = $fh->input_line_number();
1287         my $prefix = "$filename (line $linenr)";
1288
1289         if ($line =~ m/^\[(\S+)\]\s*$/i) {
1290             $section = lc($1);
1291             warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1292             next;
1293         }
1294         if (!$section) {
1295             warn "$prefix: skip line - no section";
1296             next;
1297         }
1298
1299         next if !$res->{$section}; # skip undefined section
1300
1301         if ($section eq 'options') {
1302             eval {
1303                 print "PARSE:$line\n";
1304                 my ($opt, $value) = parse_hostfw_option($line);
1305                 $res->{options}->{$opt} = $value;
1306             };
1307             warn "$prefix: $@" if $@;
1308             next;
1309         }
1310
1311         my $rules;
1312         eval { $rules = parse_fw_rule($line, 1, 1); };
1313         if (my $err = $@) {
1314             warn "$prefix: $err";
1315             next;
1316         }
1317
1318         push @{$res->{$section}}, @$rules;
1319     }
1320
1321     return $res;
1322 }
1323
1324 sub parse_group_fw_rules {
1325     my ($filename, $fh) = @_;
1326
1327     my $section;
1328     my $group;
1329
1330     my $res = { in => [], out => [] };
1331
1332     while (defined(my $line = <$fh>)) {
1333         next if $line =~ m/^#/;
1334         next if $line =~ m/^\s*$/;
1335
1336         my $linenr = $fh->input_line_number();
1337         my $prefix = "$filename (line $linenr)";
1338
1339         if ($line =~ m/^\[(in|out):(\S+)\]\s*$/i) {
1340             $section = lc($1);
1341             $group = lc($2);
1342             next;
1343         }
1344         if (!$section || !$group) {
1345             warn "$prefix: skip line - no section";
1346             next;
1347         }
1348
1349         my $rules;
1350         eval { $rules = parse_fw_rule($line, 0, 0); };
1351         if (my $err = $@) {
1352             warn "$prefix: $err";
1353             next;
1354         }
1355
1356         push @{$res->{$group}->{$section}}, @$rules;
1357     }
1358
1359     return $res;
1360 }
1361
1362 sub run_locked {
1363     my ($code, @param) = @_;
1364
1365     my $timeout = 10;
1366
1367     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
1368
1369     die $@ if $@;
1370
1371     return $res;
1372 }
1373
1374 sub read_local_vm_config {
1375
1376     my $openvz = {};
1377
1378     my $qemu = {};
1379
1380     my $list = PVE::QemuServer::config_list();
1381
1382     foreach my $vmid (keys %$list) {
1383         my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
1384         if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
1385             $qemu->{$vmid} = $conf;
1386         }
1387     }
1388
1389     my $vmdata = { openvz => $openvz, qemu => $qemu };
1390
1391     return $vmdata;
1392 };
1393
1394 sub read_vm_firewall_rules {
1395     my ($vmdata) = @_;
1396     my $rules = {};
1397     foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
1398         my $filename = "/etc/pve/firewall/$vmid.fw";
1399         my $fh = IO::File->new($filename, O_RDONLY);
1400         next if !$fh;
1401
1402         $rules->{$vmid} = parse_vm_fw_rules($filename, $fh);
1403     }
1404
1405     return $rules;
1406 }
1407
1408 sub get_option_log_level {
1409     my ($options, $k) = @_;
1410
1411     my $v = $options->{$k};
1412     $v = $default_log_level if !defined($v);
1413
1414     return undef if $v eq '' || $v eq 'nolog';
1415
1416     $v = $log_level_hash->{$v} if defined($log_level_hash->{$v});
1417
1418     return $v if ($v >= 0) && ($v <= 7);
1419
1420     warn "unknown log level ($k = '$v')\n";
1421
1422     return undef;
1423 }
1424
1425 sub generate_std_chains {
1426     my ($ruleset, $options) = @_;
1427
1428     my $loglevel = get_option_log_level($options, 'smurf_log_level');
1429
1430     # same as shorewall smurflog.
1431     if (defined($loglevel)) {
1432         $pve_std_chains-> {'PVEFW-smurflog'} = [
1433             "-j LOG --log-prefix \"smurfs-dropped\" --log-level $loglevel",
1434             "-j DROP",
1435             ];
1436     } else {
1437         $pve_std_chains-> {'PVEFW-smurflog'} = [ "-j DROP" ];
1438     }
1439
1440     # same as shorewall logflags action.
1441     $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
1442     if (defined($loglevel)) {
1443         $pve_std_chains-> {'PVEFW-logflags'} = [
1444             "-j LOG --log-prefix \"logflags-dropped:\" --log-level $loglevel --log-ip-options",
1445             "-j DROP",
1446             ];
1447     } else {
1448         $pve_std_chains-> {'PVEFW-logflags'} = [ "-j DROP" ];
1449     }
1450
1451     foreach my $chain (keys %$pve_std_chains) {
1452         ruleset_create_chain($ruleset, $chain);
1453         foreach my $rule (@{$pve_std_chains->{$chain}}) {
1454             if (ref($rule)) {
1455                 ruleset_generate_rule($ruleset, $chain, $rule);
1456             } else {
1457                 ruleset_addrule($ruleset, $chain, $rule);
1458             }
1459         }
1460     }
1461 }
1462
1463 sub save_pvefw_status {
1464     my ($status) = @_;
1465
1466     die "unknown status '$status' - internal error"
1467         if $status !~ m/^(stopped|active)$/;
1468
1469     mkdir dirname($pve_fw_status_filename);
1470     PVE::Tools::file_set_contents($pve_fw_status_filename, $status);
1471 }
1472
1473 sub read_pvefw_status {
1474
1475     my $status = 'unknown';
1476
1477     return 'stopped' if ! -f $pve_fw_status_filename;
1478
1479     eval {
1480         $status = PVE::Tools::file_get_contents($pve_fw_status_filename);
1481     };
1482     warn $@ if $@;
1483
1484     return $status;
1485 }
1486
1487 sub compile {
1488     my $vmdata = read_local_vm_config();
1489     my $rules = read_vm_firewall_rules($vmdata);
1490
1491     my $group_rules = {};
1492     my $filename = "/etc/pve/firewall/groups.fw";
1493     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1494         $group_rules = parse_group_fw_rules($filename, $fh);
1495     }
1496
1497     #print Dumper($rules);
1498
1499     my $ruleset = {};
1500
1501     ruleset_create_chain($ruleset, "PVEFW-INPUT");
1502     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
1503     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
1504
1505     my $host_options = {};
1506     my $host_rules;
1507
1508     $filename = "/etc/pve/local/host.fw";
1509     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1510         $host_rules = parse_host_fw_rules($filename, $fh);
1511         $host_options = $host_rules->{options};
1512     }
1513
1514     generate_std_chains($ruleset, $host_options);
1515
1516     my $hotsfw_enable = $host_rules && !(defined($host_options->{enable}) && ($host_options->{enable} == 0));
1517
1518     enablehostfw($ruleset, $host_rules, $group_rules) if $hotsfw_enable;
1519
1520     # generate firewall rules for QEMU VMs
1521     foreach my $vmid (keys %{$vmdata->{qemu}}) {
1522         my $conf = $vmdata->{qemu}->{$vmid};
1523         my $vmfw_conf = $rules->{$vmid};
1524         next if !$vmfw_conf;
1525         next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
1526
1527         foreach my $netid (keys %$conf) {
1528             next if $netid !~ m/^net(\d+)$/;
1529             my $net = PVE::QemuServer::parse_net($conf->{$netid});
1530             next if !$net;
1531             my $iface = "tap${vmid}i$1";
1532
1533             my $bridge = $net->{bridge};
1534             next if !$bridge; # fixme: ?
1535
1536             $bridge .= "v$net->{tag}" if $net->{tag};
1537
1538
1539             generate_bridge_chains($ruleset, $bridge);
1540
1541             my $macaddr = $net->{macaddr};
1542             generate_tap_rules_direction($ruleset, $group_rules, $iface, $netid, $macaddr, $vmfw_conf, $bridge, 'IN');
1543             generate_tap_rules_direction($ruleset, $group_rules, $iface, $netid, $macaddr, $vmfw_conf, $bridge, 'OUT');
1544         }
1545     }
1546
1547     if ($hotsfw_enable) {
1548         # allow traffic from lo (ourself)
1549         ruleset_addrule($ruleset, "PVEFW-INPUT", "-i lo -j ACCEPT");
1550     }
1551
1552     return $ruleset;
1553 }
1554
1555 sub get_ruleset_status {
1556     my ($ruleset, $verbose) = @_;
1557
1558     my $active_chains = iptables_get_chains();
1559
1560     my $statushash = {};
1561
1562     foreach my $chain (sort keys %$ruleset) {
1563         my $digest = Digest::SHA->new('sha1');
1564         foreach my $cmd (@{$ruleset->{$chain}}) {
1565              $digest->add("$cmd\n");
1566         }
1567         my $sig = $digest->b64digest;
1568         $statushash->{$chain}->{sig} = $sig;
1569
1570         my $oldsig = $active_chains->{$chain};
1571         if (!defined($oldsig)) {
1572             $statushash->{$chain}->{action} = 'create';
1573         } else {
1574             if ($oldsig eq $sig) {
1575                 $statushash->{$chain}->{action} = 'exists';
1576             } else {
1577                 $statushash->{$chain}->{action} = 'update';
1578             }
1579         }
1580         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
1581         foreach my $cmd (@{$ruleset->{$chain}}) {
1582             print "\t$cmd\n" if $verbose;
1583         }
1584     }
1585
1586     foreach my $chain (sort keys %$active_chains) {
1587         if (!defined($ruleset->{$chain})) {
1588             my $sig = $active_chains->{$chain};
1589             $statushash->{$chain}->{action} = 'delete';
1590             $statushash->{$chain}->{sig} = $sig;
1591             print "delete $chain ($sig)\n" if $verbose;
1592         }
1593     }
1594
1595     return $statushash;
1596 }
1597
1598 sub print_ruleset {
1599     my ($ruleset) = @_;
1600
1601     get_ruleset_status($ruleset, 1);
1602 }
1603
1604 sub print_sig_rule {
1605     my ($chain, $sig) = @_;
1606
1607     # We just use this to store a SHA1 checksum used to detect changes
1608     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
1609 }
1610
1611 sub get_rulset_cmdlist {
1612     my ($ruleset, $verbose) = @_;
1613
1614     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
1615
1616     my $statushash = get_ruleset_status($ruleset, $verbose);
1617
1618     # create missing chains first
1619     foreach my $chain (sort keys %$ruleset) {
1620         my $stat = $statushash->{$chain};
1621         die "internal error" if !$stat;
1622         next if $stat->{action} ne 'create';
1623
1624         $cmdlist .= ":$chain - [0:0]\n";
1625     }
1626
1627     my $rule = "INPUT -j PVEFW-INPUT";
1628     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1629         $cmdlist .= "-A $rule\n";
1630     }
1631     $rule = "OUTPUT -j PVEFW-OUTPUT";
1632     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1633         $cmdlist .= "-A $rule\n";
1634     }
1635
1636     $rule = "FORWARD -j PVEFW-FORWARD";
1637     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1638         $cmdlist .= "-A $rule\n";
1639     }
1640
1641     foreach my $chain (sort keys %$ruleset) {
1642         my $stat = $statushash->{$chain};
1643         die "internal error" if !$stat;
1644
1645         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
1646             $cmdlist .= "-F $chain\n";
1647             foreach my $cmd (@{$ruleset->{$chain}}) {
1648                 $cmdlist .= "$cmd\n";
1649             }
1650             $cmdlist .= print_sig_rule($chain, $stat->{sig});
1651         } elsif ($stat->{action} eq 'delete') {
1652             die "internal error"; # this should not happen
1653         } elsif ($stat->{action} eq 'exists') {
1654             # do nothing
1655         } else {
1656             die "internal error - unknown status '$stat->{action}'";
1657         }
1658     }
1659
1660     foreach my $chain (keys %$statushash) {
1661         next if $statushash->{$chain}->{action} ne 'delete';
1662         $cmdlist .= "-F $chain\n";
1663     }
1664     foreach my $chain (keys %$statushash) {
1665         next if $statushash->{$chain}->{action} ne 'delete';
1666         next if $chain eq 'PVEFW-INPUT';
1667         next if $chain eq 'PVEFW-OUTPUT';
1668         next if $chain eq 'PVEFW-FORWARD';
1669         $cmdlist .= "-X $chain\n";
1670     }
1671
1672     $cmdlist .= "COMMIT\n";
1673
1674     return $cmdlist;
1675 }
1676
1677 sub apply_ruleset {
1678     my ($ruleset, $verbose) = @_;
1679
1680     enable_bridge_firewall();
1681
1682     my $cmdlist = get_rulset_cmdlist($ruleset, $verbose);
1683
1684     print $cmdlist if $verbose;
1685
1686     iptables_restore_cmdlist($cmdlist);
1687
1688     # test: re-read status and check if everything is up to date
1689     my $statushash = get_ruleset_status($ruleset);
1690
1691     my $errors;
1692     foreach my $chain (sort keys %$ruleset) {
1693         my $stat = $statushash->{$chain};
1694         if ($stat->{action} ne 'exists') {
1695             warn "unable to update chain '$chain'\n";
1696             $errors = 1;
1697         }
1698     }
1699
1700     die "unable to apply firewall changes\n" if $errors;
1701 }
1702
1703 sub update {
1704     my ($start, $verbose) = @_;
1705
1706     my $code = sub {
1707         my $status = read_pvefw_status();
1708
1709         my $ruleset = PVE::Firewall::compile();
1710
1711         if ($start || $status eq 'active') {
1712
1713             save_pvefw_status('active') if ($status ne 'active');
1714
1715             PVE::Firewall::apply_ruleset($ruleset, $verbose);
1716         } else {
1717             print "Firewall not active (status = $status)\n" if $verbose;
1718         }
1719     };
1720
1721     run_locked($code);
1722 }
1723
1724
1725 1;