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::INotify;
   8 use PVE::Cluster;
   9 use PVE::ProcFSTools;
  10 use PVE::Tools;
  11 use File::Basename;
  12 use File::Path;
  13 use IO::File;
  14 use Net::IP;
  15 use PVE::Tools qw(run_command lock_file);
  16 use Encode;
  17
  18 # dynamically include PVE::QemuServer and PVE::OpenVZ
  19 # to avoid dependency problems
  20 my $have_qemu_server;
  21 eval {
  22     require PVE::QemuServer;
  23     $have_qemu_server = 1;
  24 };
  25
  26 my $have_pve_manager;
  27 eval {
  28     require PVE::OpenVZ;
  29     $have_pve_manager = 1;
  30 };
  31
  32 use Data::Dumper;
  33
  34 my $nodename = PVE::INotify::nodename();
  35
  36 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
  37 my $pve_fw_status_filename = "/var/lib/pve-firewall/pvefw.status";
  38
  39 my $default_log_level = 'info';
  40
  41 my $log_level_hash = {
  42     debug => 7,
  43     info => 6,
  44     notice => 5,
  45     warning => 4,
  46     err => 3,
  47     crit => 2,
  48     alert => 1,
  49     emerg => 0,
  50 };
  51
  52 # imported/converted from: /usr/share/shorewall/macro.*
  53 my $pve_fw_macros = {
  54     'Amanda' => [
  55         { action => 'PARAM', proto => 'udp', dport => '10080' },
  56         { action => 'PARAM', proto => 'tcp', dport => '10080' },
  57     ],
  58     'Auth' => [
  59         { action => 'PARAM', proto => 'tcp', dport => '113' },
  60     ],
  61     'BGP' => [
  62         { action => 'PARAM', proto => 'tcp', dport => '179' },
  63     ],
  64     'BitTorrent' => [
  65         { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
  66         { action => 'PARAM', proto => 'udp', dport => '6881' },
  67     ],
  68     'BitTorrent32' => [
  69         { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
  70         { action => 'PARAM', proto => 'udp', dport => '6881' },
  71     ],
  72     'CVS' => [
  73         { action => 'PARAM', proto => 'tcp', dport => '2401' },
  74     ],
  75     'Citrix' => [
  76         { action => 'PARAM', proto => 'tcp', dport => '1494' },
  77         { action => 'PARAM', proto => 'udp', dport => '1604' },
  78         { action => 'PARAM', proto => 'tcp', dport => '2598' },
  79     ],
  80     'DAAP' => [
  81         { action => 'PARAM', proto => 'tcp', dport => '3689' },
  82         { action => 'PARAM', proto => 'udp', dport => '3689' },
  83     ],
  84     'DCC' => [
  85         { action => 'PARAM', proto => 'tcp', dport => '6277' },
  86     ],
  87     'DHCPfwd' => [
  88         { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
  89         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '67:68', sport => '67:68' },
  90     ],
  91     'DNS' => [
  92         { action => 'PARAM', proto => 'udp', dport => '53' },
  93         { action => 'PARAM', proto => 'tcp', dport => '53' },
  94     ],
  95     'Distcc' => [
  96         { action => 'PARAM', proto => 'tcp', dport => '3632' },
  97     ],
  98     'Edonkey' => [
  99         { action => 'PARAM', proto => 'tcp', dport => '4662' },
 100         { action => 'PARAM', proto => 'udp', dport => '4665' },
 101     ],
 102     'FTP' => [
 103         { action => 'PARAM', proto => 'tcp', dport => '21' },
 104     ],
 105     'Finger' => [
 106         { action => 'PARAM', proto => 'tcp', dport => '79' },
 107     ],
 108     'GNUnet' => [
 109         { action => 'PARAM', proto => 'tcp', dport => '2086' },
 110         { action => 'PARAM', proto => 'udp', dport => '2086' },
 111         { action => 'PARAM', proto => 'tcp', dport => '1080' },
 112         { action => 'PARAM', proto => 'udp', dport => '1080' },
 113     ],
 114     'GRE' => [
 115         { action => 'PARAM', proto => '47' },
 116         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '47' },
 117     ],
 118     'Git' => [
 119         { action => 'PARAM', proto => 'tcp', dport => '9418' },
 120     ],
 121     'Gnutella' => [
 122         { action => 'PARAM', proto => 'tcp', dport => '6346' },
 123         { action => 'PARAM', proto => 'udp', dport => '6346' },
 124     ],
 125     'HKP' => [
 126         { action => 'PARAM', proto => 'tcp', dport => '11371' },
 127     ],
 128     'HTTP' => [
 129         { action => 'PARAM', proto => 'tcp', dport => '80' },
 130     ],
 131     'HTTPS' => [
 132         { action => 'PARAM', proto => 'tcp', dport => '443' },
 133     ],
 134     'ICPV2' => [
 135         { action => 'PARAM', proto => 'udp', dport => '3130' },
 136     ],
 137     'ICQ' => [
 138         { action => 'PARAM', proto => 'tcp', dport => '5190' },
 139     ],
 140     'IMAP' => [
 141         { action => 'PARAM', proto => 'tcp', dport => '143' },
 142     ],
 143     'IMAPS' => [
 144         { action => 'PARAM', proto => 'tcp', dport => '993' },
 145     ],
 146     'IPIP' => [
 147         { action => 'PARAM', proto => '94' },
 148         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '94' },
 149     ],
 150     'IPP' => [
 151         { action => 'PARAM', proto => 'tcp', dport => '631' },
 152     ],
 153     'IPPbrd' => [
 154         { action => 'PARAM', proto => 'udp', dport => '631' },
 155     ],
 156     'IPPserver' => [
 157         { action => 'PARAM', source => 'SOURCE', dest => 'DEST', proto => 'tcp', dport => '631' },
 158         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '631' },
 159     ],
 160     'IPsec' => [
 161         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 162         { action => 'PARAM', proto => '50' },
 163         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500', sport => '500' },
 164         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '50' },
 165     ],
 166     'IPsecah' => [
 167         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 168         { action => 'PARAM', proto => '51' },
 169         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500', sport => '500' },
 170         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '51' },
 171     ],
 172     'IPsecnat' => [
 173         { action => 'PARAM', proto => 'udp', dport => '500' },
 174         { action => 'PARAM', proto => 'udp', dport => '4500' },
 175         { action => 'PARAM', proto => '50' },
 176         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '500' },
 177         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '4500' },
 178         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '50' },
 179     ],
 180     'IRC' => [
 181         { action => 'PARAM', proto => 'tcp', dport => '6667' },
 182     ],
 183     'JabberPlain' => [
 184         { action => 'PARAM', proto => 'tcp', dport => '5222' },
 185     ],
 186     'JabberSecure' => [
 187         { action => 'PARAM', proto => 'tcp', dport => '5223' },
 188     ],
 189     'Jabberd' => [
 190         { action => 'PARAM', proto => 'tcp', dport => '5269' },
 191     ],
 192     'Jetdirect' => [
 193         { action => 'PARAM', proto => 'tcp', dport => '9100' },
 194     ],
 195     'L2TP' => [
 196         { action => 'PARAM', proto => 'udp', dport => '1701' },
 197         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '1701' },
 198     ],
 199     'LDAP' => [
 200         { action => 'PARAM', proto => 'tcp', dport => '389' },
 201     ],
 202     'LDAPS' => [
 203         { action => 'PARAM', proto => 'tcp', dport => '636' },
 204     ],
 205     'MSNP' => [
 206         { action => 'PARAM', proto => 'tcp', dport => '1863' },
 207     ],
 208     'MSSQL' => [
 209         { action => 'PARAM', proto => 'tcp', dport => '1433' },
 210     ],
 211     'Mail' => [
 212         { action => 'PARAM', proto => 'tcp', dport => '25' },
 213         { action => 'PARAM', proto => 'tcp', dport => '465' },
 214         { action => 'PARAM', proto => 'tcp', dport => '587' },
 215     ],
 216     'Munin' => [
 217         { action => 'PARAM', proto => 'tcp', dport => '4949' },
 218     ],
 219     'MySQL' => [
 220         { action => 'PARAM', proto => 'tcp', dport => '3306' },
 221     ],
 222     'NNTP' => [
 223         { action => 'PARAM', proto => 'tcp', dport => '119' },
 224     ],
 225     'NNTPS' => [
 226         { action => 'PARAM', proto => 'tcp', dport => '563' },
 227     ],
 228     'NTP' => [
 229         { action => 'PARAM', proto => 'udp', dport => '123' },
 230     ],
 231     'NTPbi' => [
 232         { action => 'PARAM', proto => 'udp', dport => '123' },
 233         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '123' },
 234     ],
 235     'NTPbrd' => [
 236         { action => 'PARAM', proto => 'udp', dport => '123' },
 237         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '123' },
 238     ],
 239     'OSPF' => [
 240         { action => 'PARAM', proto => '89' },
 241     ],
 242     'OpenVPN' => [
 243         { action => 'PARAM', proto => 'udp', dport => '1194' },
 244     ],
 245     'PCA' => [
 246         { action => 'PARAM', proto => 'udp', dport => '5632' },
 247         { action => 'PARAM', proto => 'tcp', dport => '5631' },
 248     ],
 249     'POP3' => [
 250         { action => 'PARAM', proto => 'tcp', dport => '110' },
 251     ],
 252     'POP3S' => [
 253         { action => 'PARAM', proto => 'tcp', dport => '995' },
 254     ],
 255     'PPtP' => [
 256         { action => 'PARAM', proto => '47' },
 257         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => '47' },
 258         { action => 'PARAM', proto => 'tcp', dport => '1723' },
 259     ],
 260     'Ping' => [
 261         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 262     ],
 263     'PostgreSQL' => [
 264         { action => 'PARAM', proto => 'tcp', dport => '5432' },
 265     ],
 266     'Printer' => [
 267         { action => 'PARAM', proto => 'tcp', dport => '515' },
 268     ],
 269     'RDP' => [
 270         { action => 'PARAM', proto => 'tcp', dport => '3389' },
 271     ],
 272     'RIPbi' => [
 273         { action => 'PARAM', proto => 'udp', dport => '520' },
 274         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '520' },
 275     ],
 276     'RNDC' => [
 277         { action => 'PARAM', proto => 'tcp', dport => '953' },
 278     ],
 279     'Razor' => [
 280         { action => 'ACCEPT', proto => 'tcp', dport => '2703' },
 281     ],
 282     'Rdate' => [
 283         { action => 'PARAM', proto => 'tcp', dport => '37' },
 284     ],
 285     'Rsync' => [
 286         { action => 'PARAM', proto => 'tcp', dport => '873' },
 287     ],
 288     'SANE' => [
 289         { action => 'PARAM', proto => 'tcp', dport => '6566' },
 290     ],
 291     'SMB' => [
 292         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 293         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 294         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 295         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 296     ],
 297     'SMBBI' => [
 298         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 299         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 300         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 301         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 302         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '135,445' },
 303         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '137:139' },
 304         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'udp', dport => '1024:65535', sport => '137' },
 305         { action => 'PARAM', source => 'DEST', dest => 'SOURCE', proto => 'tcp', dport => '135,139,445' },
 306     ],
 307     'SMBswat' => [
 308         { action => 'PARAM', proto => 'tcp', dport => '901' },
 309     ],
 310     'SMTP' => [
 311         { action => 'PARAM', proto => 'tcp', dport => '25' },
 312     ],
 313     'SMTPS' => [
 314         { action => 'PARAM', proto => 'tcp', dport => '465' },
 315     ],
 316     'SNMP' => [
 317         { action => 'PARAM', proto => 'udp', dport => '161:162' },
 318         { action => 'PARAM', proto => 'tcp', dport => '161' },
 319     ],
 320     'SPAMD' => [
 321         { action => 'PARAM', proto => 'tcp', dport => '783' },
 322     ],
 323     'SSH' => [
 324         { action => 'PARAM', proto => 'tcp', dport => '22' },
 325     ],
 326     'SVN' => [
 327         { action => 'PARAM', proto => 'tcp', dport => '3690' },
 328     ],
 329     'SixXS' => [
 330         { action => 'PARAM', proto => 'tcp', dport => '3874' },
 331         { action => 'PARAM', proto => 'udp', dport => '3740' },
 332         { action => 'PARAM', proto => '41' },
 333         { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
 334     ],
 335     'Squid' => [
 336         { action => 'PARAM', proto => 'tcp', dport => '3128' },
 337     ],
 338     'Submission' => [
 339         { action => 'PARAM', proto => 'tcp', dport => '587' },
 340     ],
 341     'Syslog' => [
 342         { action => 'PARAM', proto => 'udp', dport => '514' },
 343         { action => 'PARAM', proto => 'tcp', dport => '514' },
 344     ],
 345     'TFTP' => [
 346         { action => 'PARAM', proto => 'udp', dport => '69' },
 347     ],
 348     'Telnet' => [
 349         { action => 'PARAM', proto => 'tcp', dport => '23' },
 350     ],
 351     'Telnets' => [
 352         { action => 'PARAM', proto => 'tcp', dport => '992' },
 353     ],
 354     'Time' => [
 355         { action => 'PARAM', proto => 'tcp', dport => '37' },
 356     ],
 357     'Trcrt' => [
 358         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 359         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 360     ],
 361     'VNC' => [
 362         { action => 'PARAM', proto => 'tcp', dport => '5900:5909' },
 363     ],
 364     'VNCL' => [
 365         { action => 'PARAM', proto => 'tcp', dport => '5500' },
 366     ],
 367     'Web' => [
 368         { action => 'PARAM', proto => 'tcp', dport => '80' },
 369         { action => 'PARAM', proto => 'tcp', dport => '443' },
 370     ],
 371     'Webcache' => [
 372         { action => 'PARAM', proto => 'tcp', dport => '8080' },
 373     ],
 374     'Webmin' => [
 375         { action => 'PARAM', proto => 'tcp', dport => '10000' },
 376     ],
 377     'Whois' => [
 378         { action => 'PARAM', proto => 'tcp', dport => '43' },
 379     ],
 380 };
 381
 382 my $pve_fw_parsed_macros;
 383 my $pve_fw_preferred_macro_names = {};
 384
 385 my $pve_std_chains = {
 386     'PVEFW-SET-ACCEPT-MARK' => [
 387         "-j MARK --set-mark 1",
 388     ],
 389     'PVEFW-DropBroadcast' => [
 390         # same as shorewall 'Broadcast'
 391         # simply DROP BROADCAST/MULTICAST/ANYCAST
 392         # we can use this to reduce logging
 393         { action => 'DROP', dsttype => 'BROADCAST' },
 394         { action => 'DROP', dsttype => 'MULTICAST' },
 395         { action => 'DROP', dsttype => 'ANYCAST' },
 396         { action => 'DROP', dest => '224.0.0.0/4' },
 397     ],
 398     'PVEFW-reject' => [
 399         # same as shorewall 'reject'
 400         { action => 'DROP', dsttype => 'BROADCAST' },
 401         { action => 'DROP', source => '224.0.0.0/4' },
 402         { action => 'DROP', proto => 'icmp' },
 403         "-p tcp -j REJECT --reject-with tcp-reset",
 404         "-p udp -j REJECT --reject-with icmp-port-unreachable",
 405         "-p icmp -j REJECT --reject-with icmp-host-unreachable",
 406         "-j REJECT --reject-with icmp-host-prohibited",
 407     ],
 408     'PVEFW-Drop' => [
 409         # same as shorewall 'Drop', which is equal to DROP,
 410         # but REJECT/DROP some packages to reduce logging,
 411         # and ACCEPT critical ICMP types
 412         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 413         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 414         { action => 'PVEFW-DropBroadcast' },
 415         # ACCEPT critical ICMP types
 416         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 417         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 418         # Drop packets with INVALID state
 419         "-m conntrack --ctstate INVALID -j DROP",
 420         # Drop Microsoft SMB noise
 421         { action => 'DROP', proto => 'udp', dport => '135,445', nbdport => 2 },
 422         { action => 'DROP', proto => 'udp', dport => '137:139'},
 423         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 424         { action => 'DROP', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
 425         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 426         # Drop new/NotSyn traffic so that it doesn't get logged
 427         "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
 428         # Drop DNS replies
 429         { action => 'DROP', proto => 'udp', sport => 53 },
 430     ],
 431     'PVEFW-Reject' => [
 432         # same as shorewall 'Reject', which is equal to Reject,
 433         # but REJECT/DROP some packages to reduce logging,
 434         # and ACCEPT critical ICMP types
 435         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 436         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 437         { action => 'PVEFW-DropBroadcast' },
 438         # ACCEPT critical ICMP types
 439         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 440         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 441         # Drop packets with INVALID state
 442         "-m conntrack --ctstate INVALID -j DROP",
 443         # Drop Microsoft SMB noise
 444         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445', nbdport => 2 },
 445         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
 446         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 447         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445', nbdport => 3 },
 448         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 449         # Drop new/NotSyn traffic so that it doesn't get logged
 450         "-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j DROP",
 451         # Drop DNS replies
 452         { action => 'DROP', proto => 'udp', sport => 53 },
 453     ],
 454     'PVEFW-tcpflags' => [
 455         # same as shorewall tcpflags action.
 456         # Packets arriving on this interface are checked for som illegal combinations of TCP flags
 457         "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -g PVEFW-logflags",
 458         "-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -g PVEFW-logflags",
 459         "-p tcp -m tcp --tcp-flags SYN,RST SYN,RST -g PVEFW-logflags",
 460         "-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -g PVEFW-logflags",
 461         "-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN -g PVEFW-logflags",
 462     ],
 463     'PVEFW-smurfs' => [
 464         # same as shorewall smurfs action
 465         # Filter packets for smurfs (packets with a broadcast address as the source).
 466         "-s 0.0.0.0/32 -j RETURN",
 467         "-m addrtype --src-type BROADCAST -g PVEFW-smurflog",
 468         "-s 224.0.0.0/4 -g PVEFW-smurflog",
 469     ],
 470 };
 471
 472 # iptables -p icmp -h
 473 my $icmp_type_names = {
 474     any => 1,
 475     'echo-reply' => 1,
 476     'destination-unreachable' => 1,
 477     'network-unreachable' => 1,
 478     'host-unreachable' => 1,
 479     'protocol-unreachable' => 1,
 480     'port-unreachable' => 1,
 481     'fragmentation-needed' => 1,
 482     'source-route-failed' => 1,
 483     'network-unknown' => 1,
 484     'host-unknown' => 1,
 485     'network-prohibited' => 1,
 486     'host-prohibited' => 1,
 487     'TOS-network-unreachable' => 1,
 488     'TOS-host-unreachable' => 1,
 489     'communication-prohibited' => 1,
 490     'host-precedence-violation' => 1,
 491     'precedence-cutoff' => 1,
 492     'source-quench' => 1,
 493     'redirect' => 1,
 494     'network-redirect' => 1,
 495     'host-redirect' => 1,
 496     'TOS-network-redirect' => 1,
 497     'TOS-host-redirect' => 1,
 498     'echo-request' => 1,
 499     'router-advertisement' => 1,
 500     'router-solicitation' => 1,
 501     'time-exceeded' => 1,
 502     'ttl-zero-during-transit' => 1,
 503     'ttl-zero-during-reassembly' => 1,
 504     'parameter-problem' => 1,
 505     'ip-header-bad' => 1,
 506     'required-option-missing' => 1,
 507     'timestamp-request' => 1,
 508     'timestamp-reply' => 1,
 509     'address-mask-request' => 1,
 510     'address-mask-reply' => 1,
 511 };
 512
 513 sub get_firewall_macros {
 514
 515     return $pve_fw_parsed_macros if $pve_fw_parsed_macros;
 516
 517     $pve_fw_parsed_macros = {};
 518
 519     foreach my $k (keys %$pve_fw_macros) {
 520         my $name = lc($k);
 521
 522         my $macro =  $pve_fw_macros->{$k};
 523         $pve_fw_preferred_macro_names->{$name} = $k;
 524         $pve_fw_parsed_macros->{$name} = $macro;
 525     }
 526
 527     return $pve_fw_parsed_macros;
 528 }
 529
 530 my $etc_services;
 531
 532 sub get_etc_services {
 533
 534     return $etc_services if $etc_services;
 535
 536     my $filename = "/etc/services";
 537
 538     my $fh = IO::File->new($filename, O_RDONLY);
 539     if (!$fh) {
 540         warn "unable to read '$filename' - $!\n";
 541         return {};
 542     }
 543
 544     my $services = {};
 545
 546     while (my $line = <$fh>) {
 547         chomp ($line);
 548         next if $line =~m/^#/;
 549         next if ($line =~m/^\s*$/);
 550
 551         if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp).*$!) {
 552             $services->{byid}->{$2}->{name} = $1;
 553             $services->{byid}->{$2}->{port} = $2;
 554             $services->{byid}->{$2}->{$3} = 1;
 555             $services->{byname}->{$1} = $services->{byid}->{$2};
 556         }
 557     }
 558
 559     close($fh);
 560
 561     $etc_services = $services;
 562
 563
 564     return $etc_services;
 565 }
 566
 567 my $etc_protocols;
 568
 569 sub get_etc_protocols {
 570     return $etc_protocols if $etc_protocols;
 571
 572     my $filename = "/etc/protocols";
 573
 574     my $fh = IO::File->new($filename, O_RDONLY);
 575     if (!$fh) {
 576         warn "unable to read '$filename' - $!\n";
 577         return {};
 578     }
 579
 580     my $protocols = {};
 581
 582     while (my $line = <$fh>) {
 583         chomp ($line);
 584         next if $line =~m/^#/;
 585         next if ($line =~m/^\s*$/);
 586
 587         if ($line =~ m!^(\S+)\s+(\d+)\s+.*$!) {
 588             $protocols->{byid}->{$2}->{name} = $1;
 589             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
 590         }
 591     }
 592
 593     close($fh);
 594
 595     $etc_protocols = $protocols;
 596
 597     return $etc_protocols;
 598 }
 599
 600 sub parse_address_list {
 601     my ($str) = @_;
 602
 603     my $nbaor = 0;
 604     foreach my $aor (split(/,/, $str)) {
 605         if (!Net::IP->new($aor)) {
 606             my $err = Net::IP::Error();
 607             die "invalid IP address: $err\n";
 608         }else{
 609             $nbaor++;
 610         }
 611     }
 612     return $nbaor;
 613 }
 614
 615 sub parse_port_name_number_or_range {
 616     my ($str) = @_;
 617
 618     my $services = PVE::Firewall::get_etc_services();
 619     my $nbports = 0;
 620     foreach my $item (split(/,/, $str)) {
 621         my $portlist = "";
 622         my $oldpon = undef;
 623         $nbports++;
 624         foreach my $pon (split(':', $item, 2)) {
 625             $pon = $services->{byname}->{$pon}->{port} if $services->{byname}->{$pon}->{port};
 626             if ($pon =~ m/^\d+$/){
 627                 die "invalid port '$pon'\n" if $pon < 0 && $pon > 65535;
 628                 die "port '$pon' must be bigger than port '$oldpon' \n" if $oldpon && ($pon < $oldpon);
 629                 $oldpon = $pon;
 630             }else{
 631                 die "invalid port $services->{byname}->{$pon}\n" if !$services->{byname}->{$pon};
 632             }
 633         }
 634     }
 635
 636     return ($nbports);
 637 }
 638
 639 # helper function for API
 640 sub cleanup_fw_rule {
 641     my ($rule, $digest, $pos) = @_;
 642
 643     my $r = {};
 644
 645     foreach my $k (keys %$rule) {
 646         next if $k eq 'nbdport';
 647         next if $k eq 'nbsport';
 648         my $v = $rule->{$k};
 649         next if !defined($v);
 650         $r->{$k} = $v;
 651         $r->{digest} = $digest;
 652         $r->{pos} = $pos;
 653     }
 654
 655     return $r;
 656 }
 657
 658 my $bridge_firewall_enabled = 0;
 659
 660 sub enable_bridge_firewall {
 661
 662     return if $bridge_firewall_enabled; # only once
 663
 664     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
 665     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
 666
 667     # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
 668     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
 669
 670     $bridge_firewall_enabled = 1;
 671 }
 672
 673 my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n";
 674
 675 sub iptables {
 676     my ($cmd) = @_;
 677
 678     run_command("/sbin/iptables $cmd", outfunc => sub {}, errfunc => sub {});
 679 }
 680
 681 sub iptables_restore_cmdlist {
 682     my ($cmdlist) = @_;
 683
 684     run_command("/sbin/iptables-restore -n", input => $cmdlist);
 685 }
 686
 687 sub iptables_get_chains {
 688
 689     my $res = {};
 690
 691     # check what chains we want to track
 692     my $is_pvefw_chain = sub {
 693         my $name = shift;
 694
 695         return 1 if $name =~ m/^PVEFW-\S+$/;
 696
 697         return 1 if $name =~ m/^tap\d+i\d+-(:?IN|OUT)$/;
 698
 699         return 1 if $name =~ m/^veth\d+.\d+-(:?IN|OUT)$/; # fixme: dev name is configurable
 700
 701         return 1 if $name =~ m/^venet0-\d+-(:?IN|OUT)$/;
 702
 703         return 1 if $name =~ m/^vmbr\d+-(:?FW|IN|OUT)$/;
 704         return 1 if $name =~ m/^GROUP-(:?[^\s\-]+)-(:?IN|OUT)$/;
 705
 706         return undef;
 707     };
 708
 709     my $table = '';
 710
 711     my $parser = sub {
 712         my $line = shift;
 713
 714         return if $line =~ m/^#/;
 715         return if $line =~ m/^\s*$/;
 716
 717         if ($line =~ m/^\*(\S+)$/) {
 718             $table = $1;
 719             return;
 720         }
 721
 722         return if $table ne 'filter';
 723
 724         if ($line =~ m/^:(\S+)\s/) {
 725             my $chain = $1;
 726             return if !&$is_pvefw_chain($chain);
 727             $res->{$chain} = "unknown";
 728         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
 729             my ($chain, $sig) = ($1, $2);
 730             return if !&$is_pvefw_chain($chain);
 731             $res->{$chain} = $sig;
 732         } else {
 733             # simply ignore the rest
 734             return;
 735         }
 736     };
 737
 738     run_command("/sbin/iptables-save", outfunc => $parser);
 739
 740     return $res;
 741 }
 742
 743 sub iptables_chain_exist {
 744     my ($chain) = @_;
 745
 746     eval{
 747         iptables("-n --list $chain");
 748     };
 749     return undef if $@;
 750
 751     return 1;
 752 }
 753
 754 sub iptables_rule_exist {
 755     my ($rule) = @_;
 756
 757     eval{
 758         iptables("-C $rule");
 759     };
 760     return undef if $@;
 761
 762     return 1;
 763 }
 764
 765 sub ruleset_generate_cmdstr {
 766     my ($ruleset, $chain, $rule, $actions, $goto) = @_;
 767
 768     return if defined($rule->{enable}) && !$rule->{enable};
 769
 770     my @cmd = ();
 771
 772     push @cmd, "-i $rule->{iface_in}" if $rule->{iface_in};
 773     push @cmd, "-o $rule->{iface_out}" if $rule->{iface_out};
 774
 775     push @cmd, "-m iprange --src-range" if $rule->{nbsource} && $rule->{nbsource} > 1;
 776     push @cmd, "-s $rule->{source}" if $rule->{source};
 777     push @cmd, "-m iprange --dst-range" if $rule->{nbdest} && $rule->{nbdest} > 1;
 778     push @cmd, "-d $rule->{dest}" if $rule->{dest};
 779
 780     if ($rule->{proto}) {
 781         push @cmd, "-p $rule->{proto}";
 782
 783         my $multiport = 0;
 784         $multiport++ if $rule->{nbdport} && ($rule->{nbdport} > 1);
 785         $multiport++ if $rule->{nbsport} && ($rule->{nbsport} > 1);
 786
 787         push @cmd, "--match multiport" if $multiport;
 788
 789         die "multiport: option '--sports' cannot be used together with '--dports'\n"
 790             if ($multiport == 2) && ($rule->{dport} ne $rule->{sport});
 791
 792         if ($rule->{dport}) {
 793             if ($rule->{proto} && $rule->{proto} eq 'icmp') {
 794                 # Note: we use dport to store --icmp-type
 795                 die "unknown icmp-type '$rule->{dport}'\n" if !defined($icmp_type_names->{$rule->{dport}});
 796                 push @cmd, "-m icmp --icmp-type $rule->{dport}";
 797             } else {
 798                 if ($rule->{nbdport} && $rule->{nbdport} > 1) {
 799                     if ($multiport == 2) {
 800                         push @cmd,  "--ports $rule->{dport}";
 801                     } else {
 802                         push @cmd, "--dports $rule->{dport}";
 803                     }
 804                 } else {
 805                     push @cmd, "--dport $rule->{dport}";
 806                 }
 807             }
 808         }
 809
 810         if ($rule->{sport}) {
 811             if ($rule->{nbsport} && $rule->{nbsport} > 1) {
 812                 push @cmd, "--sports $rule->{sport}" if $multiport != 2;
 813             } else {
 814                 push @cmd, "--sport $rule->{sport}";
 815             }
 816         }
 817     } elsif ($rule->{dport} || $rule->{sport}) {
 818         warn "ignoring destination port '$rule->{dport}' - no protocol specified\n" if $rule->{dport};
 819         warn "ignoring source port '$rule->{sport}' - no protocol specified\n" if $rule->{sport};
 820     }
 821
 822     push @cmd, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
 823
 824     if (my $action = $rule->{action}) {
 825         $action = $actions->{$action} if defined($actions->{$action});
 826         $goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
 827         push @cmd, $goto ? "-g $action" : "-j $action";
 828     }
 829
 830     return scalar(@cmd) ? join(' ', @cmd) : undef;
 831 }
 832
 833 sub ruleset_generate_rule {
 834     my ($ruleset, $chain, $rule, $actions, $goto) = @_;
 835
 836     if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $rule, $actions, $goto)) {
 837         ruleset_addrule($ruleset, $chain, $cmdstr);
 838     }
 839 }
 840
 841 sub ruleset_generate_rule_insert {
 842     my ($ruleset, $chain, $rule, $actions, $goto) = @_;
 843
 844     if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $rule, $actions, $goto)) {
 845         ruleset_insertrule($ruleset, $chain, $cmdstr);
 846     }
 847 }
 848
 849 sub ruleset_create_chain {
 850     my ($ruleset, $chain) = @_;
 851
 852     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
 853     die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
 854
 855     die "chain '$chain' already exists\n" if $ruleset->{$chain};
 856
 857     $ruleset->{$chain} = [];
 858 }
 859
 860 sub ruleset_chain_exist {
 861     my ($ruleset, $chain) = @_;
 862
 863     return $ruleset->{$chain} ? 1 : undef;
 864 }
 865
 866 sub ruleset_addrule {
 867    my ($ruleset, $chain, $rule) = @_;
 868
 869    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 870
 871    push @{$ruleset->{$chain}}, "-A $chain $rule";
 872 }
 873
 874 sub ruleset_insertrule {
 875    my ($ruleset, $chain, $rule) = @_;
 876
 877    die "no such chain '$chain'\n" if !$ruleset->{$chain};
 878
 879    unshift @{$ruleset->{$chain}}, "-A $chain $rule";
 880 }
 881
 882 sub get_log_rule_base {
 883     my ($chain, $vmid, $msg, $loglevel) = @_;
 884
 885     die "internal error - no log level" if !defined($loglevel);
 886
 887     $vmid = 0 if !defined($vmid);
 888
 889     # Note: we use special format for prefix to pass further
 890     # info to log daemon (VMID, LOGVELEL and CHAIN)
 891
 892     return "-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
 893 }
 894
 895 sub ruleset_addlog {
 896     my ($ruleset, $chain, $vmid, $msg, $loglevel, $rule) = @_;
 897
 898     return if !defined($loglevel);
 899
 900     my $logrule = get_log_rule_base($chain, $vmid, $msg, $loglevel);
 901
 902     $logrule = "$rule $logrule" if defined($rule);
 903
 904     ruleset_addrule($ruleset, $chain, $logrule)
 905 }
 906
 907 sub generate_bridge_chains {
 908     my ($ruleset, $hostfw_conf, $bridge, $routing_table) = @_;
 909
 910     my $options = $hostfw_conf->{options} || {};
 911
 912     die "error: detected direct route to bridge '$bridge'\n"
 913         if !$options->{allow_bridge_route} && $routing_table->{$bridge};
 914
 915     if (!ruleset_chain_exist($ruleset, "$bridge-FW")) {
 916         ruleset_create_chain($ruleset, "$bridge-FW");
 917         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o $bridge -m physdev --physdev-is-out -j $bridge-FW");
 918         ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i $bridge -m physdev --physdev-is-in -j $bridge-FW");
 919     }
 920
 921     if (!ruleset_chain_exist($ruleset, "$bridge-OUT")) {
 922         ruleset_create_chain($ruleset, "$bridge-OUT");
 923         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-in -j $bridge-OUT");
 924         ruleset_insertrule($ruleset, "PVEFW-INPUT", "-i $bridge -m physdev --physdev-is-in -j $bridge-OUT");
 925     }
 926
 927     if (!ruleset_chain_exist($ruleset, "$bridge-IN")) {
 928         ruleset_create_chain($ruleset, "$bridge-IN");
 929         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-out -j $bridge-IN");
 930         ruleset_addrule($ruleset, "$bridge-FW", "-m mark --mark 1 -j ACCEPT");
 931         # accept traffic to unmanaged bridge ports
 932         ruleset_addrule($ruleset, "$bridge-FW", "-m physdev --physdev-is-out -j ACCEPT ");
 933     }
 934 }
 935
 936 sub ruleset_add_chain_policy {
 937     my ($ruleset, $chain, $vmid, $policy, $loglevel, $accept_action) = @_;
 938
 939     if ($policy eq 'ACCEPT') {
 940
 941         ruleset_generate_rule($ruleset, $chain, { action => 'ACCEPT' },
 942                               { ACCEPT =>  $accept_action});
 943
 944     } elsif ($policy eq 'DROP') {
 945
 946         ruleset_addrule($ruleset, $chain, "-j PVEFW-Drop");
 947
 948         ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
 949
 950         ruleset_addrule($ruleset, $chain, "-j DROP");
 951     } elsif ($policy eq 'REJECT') {
 952         ruleset_addrule($ruleset, $chain, "-j PVEFW-Reject");
 953
 954         ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
 955
 956         ruleset_addrule($ruleset, $chain, "-g PVEFW-reject");
 957     } else {
 958         # should not happen
 959         die "internal error: unknown policy '$policy'";
 960     }
 961 }
 962
 963 sub ruleset_create_vm_chain {
 964     my ($ruleset, $chain, $options, $macaddr, $direction) = @_;
 965
 966     ruleset_create_chain($ruleset, $chain);
 967
 968     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
 969         ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
 970     }
 971
 972     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
 973         if ($direction eq 'OUT') {
 974             ruleset_generate_rule($ruleset, $chain, { action => 'PVEFW-SET-ACCEPT-MARK',
 975                                                       proto => 'udp', sport => 68, dport => 67 });
 976         } else {
 977             ruleset_generate_rule($ruleset, $chain, { action => 'ACCEPT',
 978                                                       proto => 'udp', sport => 67, dport => 68 });
 979         }
 980     }
 981
 982     if ($options->{tcpflags}) {
 983         ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
 984     }
 985
 986     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
 987     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
 988
 989     if ($direction eq 'OUT') {
 990         if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
 991             ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr -j DROP");
 992         }
 993         ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
 994     }
 995 }
 996
 997 sub ruleset_generate_vm_rules {
 998     my ($ruleset, $rules, $groups_conf, $chain, $netid, $direction) = @_;
 999
1000     my $lc_direction = lc($direction);
1001
1002     foreach my $rule (@$rules) {
1003         next if $rule->{iface} && $rule->{iface} ne $netid;
1004         next if !$rule->{enable};
1005         if ($rule->{type} eq 'group') {
1006             my $group_chain = "GROUP-$rule->{action}-$direction";
1007             if(!ruleset_chain_exist($ruleset, $group_chain)){
1008                 generate_group_rules($ruleset, $groups_conf, $rule->{action});
1009             }
1010             ruleset_addrule($ruleset, $chain, "-j $group_chain");
1011             ruleset_addrule($ruleset, $chain, "-m mark --mark 1 -j RETURN")
1012                 if $direction eq 'OUT';
1013         } else {
1014             next if $rule->{type} ne $lc_direction;
1015             if ($direction eq 'OUT') {
1016                 ruleset_generate_rule($ruleset, $chain, $rule,
1017                                       { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
1018             } else {
1019                 ruleset_generate_rule($ruleset, $chain, $rule, { REJECT => "PVEFW-reject" });
1020             }
1021         }
1022     }
1023 }
1024
1025 sub generate_venet_rules_direction {
1026     my ($ruleset, $groups_conf, $vmfw_conf, $vmid, $ip, $direction) = @_;
1027
1028     parse_address_list($ip); # make sure we have a valid $ip list
1029
1030     my $lc_direction = lc($direction);
1031
1032     my $rules = $vmfw_conf->{rules};
1033
1034     my $options = $vmfw_conf->{options};
1035     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
1036
1037     my $chain = "venet0-$vmid-$direction";
1038
1039     ruleset_create_vm_chain($ruleset, $chain, $options, undef, $direction);
1040
1041     ruleset_generate_vm_rules($ruleset, $rules, $groups_conf, $chain, 'venet', $direction);
1042
1043     # implement policy
1044     my $policy;
1045
1046     if ($direction eq 'OUT') {
1047         $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1048     } else {
1049         $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1050     }
1051
1052     my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : "ACCEPT";
1053     ruleset_add_chain_policy($ruleset, $chain, $vmid, $policy, $loglevel, $accept_action);
1054
1055     # plug into FORWARD, INPUT and OUTPUT chain
1056     if ($direction eq 'OUT') {
1057         ruleset_generate_rule_insert($ruleset, "PVEFW-FORWARD", {
1058             action => $chain,
1059             source => $ip,
1060             iface_in => 'venet0'});
1061
1062         ruleset_generate_rule_insert($ruleset, "PVEFW-INPUT", {
1063             action => $chain,
1064             source => $ip,
1065             iface_in => 'venet0'});
1066     } else {
1067         ruleset_generate_rule($ruleset, "PVEFW-FORWARD", {
1068             action => $chain,
1069             dest => $ip,
1070             iface_out => 'venet0'});
1071
1072         ruleset_generate_rule($ruleset, "PVEFW-OUTPUT", {
1073             action => $chain,
1074             dest => $ip,
1075             iface_out => 'venet0'});
1076     }
1077 }
1078
1079 sub generate_tap_rules_direction {
1080     my ($ruleset, $groups_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $bridge, $direction) = @_;
1081
1082     my $lc_direction = lc($direction);
1083
1084     my $rules = $vmfw_conf->{rules};
1085
1086     my $options = $vmfw_conf->{options};
1087     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
1088
1089     my $tapchain = "$iface-$direction";
1090
1091     ruleset_create_vm_chain($ruleset, $tapchain, $options, $macaddr, $direction);
1092
1093     ruleset_generate_vm_rules($ruleset, $rules, $groups_conf, $tapchain, $netid, $direction);
1094
1095     # implement policy
1096     my $policy;
1097
1098     if ($direction eq 'OUT') {
1099         $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1100     } else {
1101         $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1102     }
1103
1104     my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : "ACCEPT";
1105     ruleset_add_chain_policy($ruleset, $tapchain, $vmid, $policy, $loglevel, $accept_action);
1106
1107     # plug the tap chain to bridge chain
1108     if ($direction eq 'IN') {
1109         ruleset_insertrule($ruleset, "$bridge-IN",
1110                            "-m physdev --physdev-is-bridged --physdev-out $iface -j $tapchain");
1111     } else {
1112         ruleset_insertrule($ruleset, "$bridge-OUT",
1113                            "-m physdev --physdev-in $iface -j $tapchain");
1114     }
1115 }
1116
1117 sub enable_host_firewall {
1118     my ($ruleset, $hostfw_conf, $groups_conf) = @_;
1119
1120     # fixme: allow security groups
1121
1122     my $options = $hostfw_conf->{options};
1123     my $rules = $hostfw_conf->{rules};
1124
1125     # host inbound firewall
1126     my $chain = "PVEFW-HOST-IN";
1127     ruleset_create_chain($ruleset, $chain);
1128
1129     my $loglevel = get_option_log_level($options, "log_level_in");
1130
1131     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
1132         ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
1133     }
1134
1135     if ($options->{tcpflags}) {
1136         ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
1137     }
1138
1139     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1140     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
1141     ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
1142     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
1143     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW --dport 5404:5405 -j ACCEPT");
1144     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT");  #corosync
1145
1146     # we use RETURN because we need to check also tap rules
1147     my $accept_action = 'RETURN';
1148
1149     foreach my $rule (@$rules) {
1150         next if $rule->{type} ne 'in';
1151         ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
1152     }
1153
1154     # implement input policy
1155     my $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
1156     ruleset_add_chain_policy($ruleset, $chain, 0, $policy, $loglevel, $accept_action);
1157
1158     # host outbound firewall
1159     $chain = "PVEFW-HOST-OUT";
1160     ruleset_create_chain($ruleset, $chain);
1161
1162     $loglevel = get_option_log_level($options, "log_level_out");
1163
1164     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
1165     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT");
1166     ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
1167     ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST -j ACCEPT");
1168     ruleset_addrule($ruleset, $chain, "-p udp -m conntrack --ctstate NEW --dport 5404:5405 -j ACCEPT");
1169     ruleset_addrule($ruleset, $chain, "-p udp -m udp --dport 9000 -j ACCEPT"); #corosync
1170
1171     # we use RETURN because we may want to check other thigs later
1172     $accept_action = 'RETURN';
1173
1174     foreach my $rule (@$rules) {
1175         next if $rule->{type} ne 'out';
1176         ruleset_generate_rule($ruleset, $chain, $rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
1177     }
1178
1179     # implement output policy
1180     $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
1181     ruleset_add_chain_policy($ruleset, $chain, 0, $policy, $loglevel, $accept_action);
1182
1183     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
1184     ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
1185 }
1186
1187 sub generate_group_rules {
1188     my ($ruleset, $groups_conf, $group) = @_;
1189     die "no such security group '$group'\n" if !$groups_conf->{rules}->{$group};
1190
1191     my $rules = $groups_conf->{rules}->{$group};
1192
1193     my $chain = "GROUP-${group}-IN";
1194
1195     ruleset_create_chain($ruleset, $chain);
1196
1197     foreach my $rule (@$rules) {
1198         next if $rule->{type} ne 'in';
1199         ruleset_generate_rule($ruleset, $chain, $rule, { REJECT => "PVEFW-reject" });
1200     }
1201
1202     $chain = "GROUP-${group}-OUT";
1203
1204     ruleset_create_chain($ruleset, $chain);
1205     ruleset_addrule($ruleset, $chain, "-j MARK --set-mark 0"); # clear mark
1206
1207     foreach my $rule (@$rules) {
1208         next if $rule->{type} ne 'out';
1209         # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
1210         # check also other tap rules later
1211         ruleset_generate_rule($ruleset, $chain, $rule,
1212                               { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" });
1213     }
1214 }
1215
1216 my $MAX_NETS = 32;
1217 my $valid_netdev_names = {};
1218 for (my $i = 0; $i < $MAX_NETS; $i++)  {
1219     $valid_netdev_names->{"net$i"} = 1;
1220 }
1221
1222 sub parse_fw_rule {
1223     my ($line, $need_iface, $allow_groups) = @_;
1224
1225     my $macros = get_firewall_macros();
1226     my $protocols = get_etc_protocols();
1227
1228     my ($type, $action, $iface, $source, $dest, $proto, $dport, $sport);
1229
1230     # we can add single line comments to the end of the rule
1231     my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
1232
1233     # we can disable a rule when prefixed with '|'
1234     my $enable = 1;
1235
1236     $enable = 0 if $line =~ s/^\|//;
1237
1238     my @data = split(/\s+/, $line);
1239     my $expected_elements = $need_iface ? 8 : 7;
1240
1241     die "wrong number of rule elements\n" if scalar(@data) > $expected_elements;
1242
1243     if ($need_iface) {
1244         ($type, $action, $iface, $source, $dest, $proto, $dport, $sport) = @data
1245     } else {
1246         ($type, $action, $source, $dest, $proto, $dport, $sport) =  @data;
1247     }
1248
1249     die "incomplete rule\n" if ! ($type && $action);
1250
1251     my $macro;
1252     my $macro_name;
1253
1254     $type = lc($type);
1255
1256     if ($type eq  'in' || $type eq 'out') {
1257         if ($action =~ m/^(ACCEPT|DROP|REJECT)$/) {
1258             # OK
1259         } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
1260             ($macro_name, $action) = ($1, $2);
1261             my $lc_macro_name = lc($macro_name);
1262             my $preferred_name = $pve_fw_preferred_macro_names->{$lc_macro_name};
1263             $macro_name = $preferred_name if $preferred_name;
1264             $macro = $macros->{$lc_macro_name};
1265             die "unknown macro '$macro_name'\n" if !$macro;
1266         } else {
1267             die "unknown action '$action'\n";
1268         }
1269     } elsif ($type eq 'group') {
1270         die "wrong number of rule elements\n" if scalar(@data) != 3;
1271         die "groups disabled\n" if !$allow_groups;
1272
1273         die "invalid characters in group name\n" if $action !~ m/^[A-Za-z0-9_\-]+$/;
1274     } else {
1275         die "unknown rule type '$type'\n";
1276     }
1277
1278     if ($need_iface) {
1279         $iface = undef if $iface && $iface eq '-';
1280     }
1281
1282     $proto = undef if $proto && $proto eq '-';
1283     die "unknown protokol '$proto'\n" if $proto &&
1284         !(defined($protocols->{byname}->{$proto}) ||
1285           defined($protocols->{byid}->{$proto}));
1286
1287     $source = undef if $source && $source eq '-';
1288     $dest = undef if $dest && $dest eq '-';
1289
1290     $dport = undef if $dport && $dport eq '-';
1291     $sport = undef if $sport && $sport eq '-';
1292
1293     my $nbsource = undef;
1294     my $nbdest = undef;
1295
1296     $nbsource = parse_address_list($source) if $source;
1297     $nbdest = parse_address_list($dest) if $dest;
1298
1299     my $rules = [];
1300
1301     my $param = {
1302         type => $type,
1303         enable => $enable,
1304         comment => $comment,
1305         action => $action,
1306         iface => $iface,
1307         source => $source,
1308         dest => $dest,
1309         nbsource => $nbsource,
1310         nbdest => $nbdest,
1311         proto => $proto,
1312         dport => $dport,
1313         sport => $sport,
1314     };
1315
1316     if ($macro) {
1317         foreach my $templ (@$macro) {
1318             my $rule = {};
1319             my $param_used = {};
1320             foreach my $k (keys %$templ) {
1321                 my $v = $templ->{$k};
1322                 if ($v eq 'PARAM') {
1323                     $v = $param->{$k};
1324                     $param_used->{$k} = 1;
1325                 } elsif ($v eq 'DEST') {
1326                     $v = $param->{dest};
1327                     $param_used->{dest} = 1;
1328                 } elsif ($v eq 'SOURCE') {
1329                     $v = $param->{source};
1330                     $param_used->{source} = 1;
1331                 }
1332
1333                 die "missing parameter '$k' in macro '$macro_name'\n" if !defined($v);
1334                 $rule->{$k} = $v;
1335             }
1336             foreach my $k (keys %$param) {
1337                 next if !defined($param->{$k});
1338                 next if $param_used->{$k};
1339                 if (defined($rule->{$k})) {
1340                     die "parameter '$k' already define in macro (value = '$rule->{$k}')\n"
1341                         if $rule->{$k} ne $param->{$k};
1342                 } else {
1343                     $rule->{$k} = $param->{$k};
1344                 }
1345             }
1346             push @$rules, $rule;
1347         }
1348     } else {
1349         push @$rules, $param;
1350     }
1351
1352     foreach my $rule (@$rules) {
1353         $rule->{nbdport} = parse_port_name_number_or_range($rule->{dport})
1354             if defined($rule->{dport});
1355         $rule->{nbsport} = parse_port_name_number_or_range($rule->{sport})
1356             if defined($rule->{sport});
1357     }
1358
1359     return $rules;
1360 }
1361
1362 sub parse_vmfw_option {
1363     my ($line) = @_;
1364
1365     my ($opt, $value);
1366
1367     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1368
1369     if ($line =~ m/^(enable|dhcp|macfilter|nosmurfs|tcpflags):\s*(0|1)\s*$/i) {
1370         $opt = lc($1);
1371         $value = int($2);
1372     } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
1373         $opt = lc($1);
1374         $value = $2 ? lc($3) : '';
1375     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1376         $opt = lc($1);
1377         $value = uc($3);
1378     } else {
1379         chomp $line;
1380         die "can't parse option '$line'\n"
1381     }
1382
1383     return ($opt, $value);
1384 }
1385
1386 sub parse_hostfw_option {
1387     my ($line) = @_;
1388
1389     my ($opt, $value);
1390
1391     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
1392
1393     if ($line =~ m/^(enable|dhcp|nosmurfs|tcpflags|allow_bridge_route):\s*(0|1)\s*$/i) {
1394         $opt = lc($1);
1395         $value = int($2);
1396     } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
1397         $opt = lc($1);
1398         $value = $2 ? lc($3) : '';
1399     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
1400         $opt = lc($1);
1401         $value = uc($3);
1402     } elsif ($line =~ m/^(nf_conntrack_max):\s*(\d+)\s*$/i) {
1403         $opt = lc($1);
1404         $value = int($2);
1405     } else {
1406         chomp $line;
1407         die "can't parse option '$line'\n"
1408     }
1409
1410     return ($opt, $value);
1411 }
1412
1413 sub parse_vm_fw_rules {
1414     my ($filename, $fh) = @_;
1415
1416     my $res = { rules => [], options => {}};
1417
1418     my $section;
1419
1420     my $digest = Digest::SHA->new('sha1');
1421
1422     while (defined(my $line = <$fh>)) {
1423         $digest->add($line);
1424
1425         next if $line =~ m/^#/;
1426         next if $line =~ m/^\s*$/;
1427
1428         my $linenr = $fh->input_line_number();
1429         my $prefix = "$filename (line $linenr)";
1430
1431         if ($line =~ m/^\[(\S+)\]\s*$/i) {
1432             $section = lc($1);
1433             warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1434             next;
1435         }
1436         if (!$section) {
1437             warn "$prefix: skip line - no section";
1438             next;
1439         }
1440
1441         next if !$res->{$section}; # skip undefined section
1442
1443         if ($section eq 'options') {
1444             eval {
1445                 my ($opt, $value) = parse_vmfw_option($line);
1446                 $res->{options}->{$opt} = $value;
1447             };
1448             warn "$prefix: $@" if $@;
1449             next;
1450         }
1451
1452         my $rules;
1453         eval { $rules = parse_fw_rule($line, 1, 1); };
1454         if (my $err = $@) {
1455             warn "$prefix: $err";
1456             next;
1457         }
1458
1459         push @{$res->{$section}}, @$rules;
1460     }
1461
1462     $res->{digest} = $digest->b64digest;
1463
1464     return $res;
1465 }
1466
1467 sub parse_host_fw_rules {
1468     my ($filename, $fh) = @_;
1469
1470     my $res = { rules => [], options => {}};
1471
1472     my $section;
1473
1474     my $digest = Digest::SHA->new('sha1');
1475
1476     while (defined(my $line = <$fh>)) {
1477         $digest->add($line);
1478
1479         next if $line =~ m/^#/;
1480         next if $line =~ m/^\s*$/;
1481
1482         my $linenr = $fh->input_line_number();
1483         my $prefix = "$filename (line $linenr)";
1484
1485         if ($line =~ m/^\[(\S+)\]\s*$/i) {
1486             $section = lc($1);
1487             warn "$prefix: ignore unknown section '$section'\n" if !$res->{$section};
1488             next;
1489         }
1490         if (!$section) {
1491             warn "$prefix: skip line - no section";
1492             next;
1493         }
1494
1495         next if !$res->{$section}; # skip undefined section
1496
1497         if ($section eq 'options') {
1498             eval {
1499                 my ($opt, $value) = parse_hostfw_option($line);
1500                 $res->{options}->{$opt} = $value;
1501             };
1502             warn "$prefix: $@" if $@;
1503             next;
1504         }
1505
1506         my $rules;
1507         eval { $rules = parse_fw_rule($line, 1, 1); };
1508         if (my $err = $@) {
1509             warn "$prefix: $err";
1510             next;
1511         }
1512
1513         push @{$res->{$section}}, @$rules;
1514     }
1515
1516     $res->{digest} = $digest->b64digest;
1517
1518     return $res;
1519 }
1520
1521 sub parse_group_fw_rules {
1522     my ($filename, $fh) = @_;
1523
1524     my $section;
1525     my $group;
1526
1527     my $res = { rules => {} };
1528
1529     my $digest = Digest::SHA->new('sha1');
1530
1531     while (defined(my $line = <$fh>)) {
1532         $digest->add($line);
1533
1534         next if $line =~ m/^#/;
1535         next if $line =~ m/^\s*$/;
1536
1537         my $linenr = $fh->input_line_number();
1538         my $prefix = "$filename (line $linenr)";
1539
1540         if ($line =~ m/^\[group\s+(\S+)\]\s*$/i) {
1541             $section = 'rules';
1542             $group = lc($1);
1543             next;
1544         }
1545         if (!$section || !$group) {
1546             warn "$prefix: skip line - no section";
1547             next;
1548         }
1549
1550         my $rules;
1551         eval { $rules = parse_fw_rule($line, 0, 0); };
1552         if (my $err = $@) {
1553             warn "$prefix: $err";
1554             next;
1555         }
1556
1557         push @{$res->{$section}->{$group}}, @$rules;
1558     }
1559
1560     $res->{digest} = $digest->b64digest;
1561
1562     return $res;
1563 }
1564
1565 sub run_locked {
1566     my ($code, @param) = @_;
1567
1568     my $timeout = 10;
1569
1570     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
1571
1572     die $@ if $@;
1573
1574     return $res;
1575 }
1576
1577 sub read_local_vm_config {
1578
1579     my $openvz = {};
1580     my $qemu = {};
1581
1582     my $vmdata = { openvz => $openvz, qemu => $qemu };
1583
1584     my $vmlist = PVE::Cluster::get_vmlist();
1585     return $vmdata if !$vmlist || !$vmlist->{ids};
1586     my $ids = $vmlist->{ids};
1587
1588     foreach my $vmid (keys %$ids) {
1589         next if !$vmid; # skip VE0
1590         my $d = $ids->{$vmid};
1591         next if !$d->{node} || $d->{node} ne $nodename;
1592         next if !$d->{type};
1593         if ($d->{type} eq 'openvz') {
1594             if ($have_pve_manager) {
1595                 my $cfspath = PVE::OpenVZ::cfs_config_path($vmid);
1596                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
1597                     $openvz->{$vmid} = $conf;
1598                 }
1599             }
1600         } elsif ($d->{type} eq 'qemu') {
1601             if ($have_qemu_server) {
1602                 my $cfspath = PVE::QemuServer::cfs_config_path($vmid);
1603                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
1604                     $qemu->{$vmid} = $conf;
1605                 }
1606             }
1607         }
1608     }
1609
1610     return $vmdata;
1611 };
1612
1613 sub load_vmfw_conf {
1614     my ($vmid) = @_;
1615
1616     my $vmfw_conf = {};
1617
1618     my $filename = "/etc/pve/firewall/$vmid.fw";
1619     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1620         $vmfw_conf = parse_vm_fw_rules($filename, $fh);
1621     }
1622
1623     return $vmfw_conf;
1624 }
1625
1626 sub read_vm_firewall_configs {
1627     my ($vmdata) = @_;
1628     my $vmfw_configs = {};
1629
1630     foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) {
1631         my $vmfw_conf = load_vmfw_conf($vmid);
1632         next if !$vmfw_conf->{options}; # skip if file does not exists
1633         $vmfw_configs->{$vmid} = $vmfw_conf;
1634     }
1635
1636     return $vmfw_configs;
1637 }
1638
1639 sub get_option_log_level {
1640     my ($options, $k) = @_;
1641
1642     my $v = $options->{$k};
1643     $v = $default_log_level if !defined($v);
1644
1645     return undef if $v eq '' || $v eq 'nolog';
1646
1647     $v = $log_level_hash->{$v} if defined($log_level_hash->{$v});
1648
1649     return $v if ($v >= 0) && ($v <= 7);
1650
1651     warn "unknown log level ($k = '$v')\n";
1652
1653     return undef;
1654 }
1655
1656 sub generate_std_chains {
1657     my ($ruleset, $options) = @_;
1658
1659     my $loglevel = get_option_log_level($options, 'smurf_log_level');
1660
1661     # same as shorewall smurflog.
1662     my $chain = 'PVEFW-smurflog';
1663
1664     push @{$pve_std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
1665     push @{$pve_std_chains->{$chain}}, "-j DROP";
1666
1667     # same as shorewall logflags action.
1668     $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
1669     $chain = 'PVEFW-logflags';
1670     # fixme: is this correctly logged by pvewf-logger? (ther is no --log-ip-options for NFLOG)
1671     push @{$pve_std_chains->{$chain}}, get_log_rule_base($chain, 0, "DROP: ", $loglevel) if $loglevel;
1672     push @{$pve_std_chains->{$chain}}, "-j DROP";
1673
1674     foreach my $chain (keys %$pve_std_chains) {
1675         ruleset_create_chain($ruleset, $chain);
1676         foreach my $rule (@{$pve_std_chains->{$chain}}) {
1677             if (ref($rule)) {
1678                 ruleset_generate_rule($ruleset, $chain, $rule);
1679             } else {
1680                 ruleset_addrule($ruleset, $chain, $rule);
1681             }
1682         }
1683     }
1684 }
1685
1686 sub save_pvefw_status {
1687     my ($status) = @_;
1688
1689     die "unknown status '$status' - internal error"
1690         if $status !~ m/^(stopped|active)$/;
1691
1692     mkdir dirname($pve_fw_status_filename);
1693     PVE::Tools::file_set_contents($pve_fw_status_filename, $status);
1694 }
1695
1696 sub read_pvefw_status {
1697
1698     my $status = 'unknown';
1699
1700     return 'stopped' if ! -f $pve_fw_status_filename;
1701
1702     eval {
1703         $status = PVE::Tools::file_get_contents($pve_fw_status_filename);
1704     };
1705     warn $@ if $@;
1706
1707     return $status;
1708 }
1709
1710 # fixme: move to pve-common PVE::ProcFSTools
1711 sub read_proc_net_route {
1712     my $filename = "/proc/net/route";
1713
1714     my $res = {};
1715
1716     my $fh = IO::File->new ($filename, "r");
1717     return $res if !$fh;
1718
1719     my $int_to_quad = sub {
1720         return join '.' => map { ($_[0] >> 8*(3-$_)) % 256 } (3, 2, 1, 0);
1721     };
1722
1723     while (defined(my $line = <$fh>)) {
1724         next if $line =~/^Iface\s+Destination/; # skip head
1725         my ($iface, $dest, $gateway, $metric, $mask, $mtu) = (split(/\s+/, $line))[0,1,2,6,7,8];
1726         push @{$res->{$iface}}, {
1727             dest => &$int_to_quad(hex($dest)),
1728             gateway => &$int_to_quad(hex($gateway)),
1729             mask => &$int_to_quad(hex($mask)),
1730             metric => $metric,
1731             mtu => $mtu,
1732         };
1733     }
1734
1735     return $res;
1736 }
1737
1738 sub load_security_groups {
1739
1740     my $groups_conf = {};
1741     my $filename = "/etc/pve/firewall/groups.fw";
1742     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1743         $groups_conf = parse_group_fw_rules($filename, $fh);
1744     }
1745
1746     return $groups_conf;
1747 }
1748
1749 sub load_hostfw_conf {
1750
1751     my $hostfw_conf = {};
1752     my $filename = "/etc/pve/local/host.fw";
1753     if (my $fh = IO::File->new($filename, O_RDONLY)) {
1754         $hostfw_conf = parse_host_fw_rules($filename, $fh);
1755     }
1756     return $hostfw_conf;
1757 }
1758
1759 sub compile {
1760     my $vmdata = read_local_vm_config();
1761     my $vmfw_configs = read_vm_firewall_configs($vmdata);
1762
1763     my $routing_table = read_proc_net_route();
1764
1765     my $groups_conf = load_security_groups();
1766
1767     my $ruleset = {};
1768
1769     ruleset_create_chain($ruleset, "PVEFW-INPUT");
1770     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
1771
1772     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
1773
1774     my $hostfw_conf = load_hostfw_conf();
1775     my $hostfw_options = $hostfw_conf->{options} || {};
1776
1777     generate_std_chains($ruleset, $hostfw_options);
1778
1779     my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
1780
1781     enable_host_firewall($ruleset, $hostfw_conf, $groups_conf) if $hostfw_enable;
1782
1783     # generate firewall rules for QEMU VMs
1784     foreach my $vmid (keys %{$vmdata->{qemu}}) {
1785         my $conf = $vmdata->{qemu}->{$vmid};
1786         my $vmfw_conf = $vmfw_configs->{$vmid};
1787         next if !$vmfw_conf;
1788         next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
1789
1790         foreach my $netid (keys %$conf) {
1791             next if $netid !~ m/^net(\d+)$/;
1792             my $net = PVE::QemuServer::parse_net($conf->{$netid});
1793             next if !$net;
1794             my $iface = "tap${vmid}i$1";
1795
1796             my $bridge = $net->{bridge};
1797             next if !$bridge; # fixme: ?
1798
1799             $bridge .= "v$net->{tag}" if $net->{tag};
1800
1801             generate_bridge_chains($ruleset, $hostfw_conf, $bridge, $routing_table);
1802
1803             my $macaddr = $net->{macaddr};
1804             generate_tap_rules_direction($ruleset, $groups_conf, $iface, $netid, $macaddr,
1805                                          $vmfw_conf, $vmid, $bridge, 'IN');
1806             generate_tap_rules_direction($ruleset, $groups_conf, $iface, $netid, $macaddr,
1807                                          $vmfw_conf, $vmid, $bridge, 'OUT');
1808         }
1809     }
1810
1811     # generate firewall rules for OpenVZ containers
1812     foreach my $vmid (keys %{$vmdata->{openvz}}) {
1813         my $conf = $vmdata->{openvz}->{$vmid};
1814
1815         my $vmfw_conf = $vmfw_configs->{$vmid};
1816         next if !$vmfw_conf;
1817         next if defined($vmfw_conf->{options}->{enable}) && ($vmfw_conf->{options}->{enable} == 0);
1818
1819         if ($conf->{ip_address} && $conf->{ip_address}->{value}) {
1820             my $ip = $conf->{ip_address}->{value};
1821             generate_venet_rules_direction($ruleset, $groups_conf, $vmfw_conf, $vmid, $ip, 'IN');
1822             generate_venet_rules_direction($ruleset, $groups_conf, $vmfw_conf, $vmid, $ip, 'OUT');
1823         }
1824
1825         if ($conf->{netif} && $conf->{netif}->{value}) {
1826             my $netif = PVE::OpenVZ::parse_netif($conf->{netif}->{value});
1827             foreach my $netid (keys %$netif) {
1828                 my $d = $netif->{$netid};
1829                 my $bridge = $d->{bridge};
1830                 if (!$bridge) {
1831                     warn "no bridge device for CT $vmid iface '$netid'\n";
1832                     next; # fixme?
1833                 }
1834
1835                 generate_bridge_chains($ruleset, $hostfw_conf, $bridge, $routing_table);
1836
1837                 my $macaddr = $d->{mac};
1838                 my $iface = $d->{host_ifname};
1839                 generate_tap_rules_direction($ruleset, $groups_conf, $iface, $netid, $macaddr,
1840                                              $vmfw_conf, $vmid, $bridge, 'IN');
1841                 generate_tap_rules_direction($ruleset, $groups_conf, $iface, $netid, $macaddr,
1842                                              $vmfw_conf, $vmid, $bridge, 'OUT');
1843             }
1844         }
1845     }
1846
1847     # fixme: what log level should we use here?
1848     my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
1849
1850     # fixme: should we really block inter-bridge traffic?
1851
1852     # always allow traffic from containers?
1853     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i venet0 -j RETURN");
1854
1855     # disable interbridge routing
1856     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o vmbr+ -j PVEFW-Drop");
1857     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i vmbr+ -j PVEFW-Drop");
1858     ruleset_addlog($ruleset, "PVEFW-FORWARD", 0, "DROP: ", $loglevel, "-o vmbr+");
1859     ruleset_addlog($ruleset, "PVEFW-FORWARD", 0, "DROP: ", $loglevel, "-i vmbr+");
1860     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-o vmbr+ -j DROP");
1861     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-i vmbr+ -j DROP");
1862
1863     return wantarray ? ($ruleset, $hostfw_conf) : $ruleset;
1864 }
1865
1866 sub get_ruleset_status {
1867     my ($ruleset, $verbose) = @_;
1868
1869     my $active_chains = iptables_get_chains();
1870
1871     my $statushash = {};
1872
1873     foreach my $chain (sort keys %$ruleset) {
1874         my $digest = Digest::SHA->new('sha1');
1875         foreach my $cmd (@{$ruleset->{$chain}}) {
1876              $digest->add("$cmd\n");
1877         }
1878         my $sig = $digest->b64digest;
1879         $statushash->{$chain}->{sig} = $sig;
1880
1881         my $oldsig = $active_chains->{$chain};
1882         if (!defined($oldsig)) {
1883             $statushash->{$chain}->{action} = 'create';
1884         } else {
1885             if ($oldsig eq $sig) {
1886                 $statushash->{$chain}->{action} = 'exists';
1887             } else {
1888                 $statushash->{$chain}->{action} = 'update';
1889             }
1890         }
1891         print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
1892         foreach my $cmd (@{$ruleset->{$chain}}) {
1893             print "\t$cmd\n" if $verbose;
1894         }
1895     }
1896
1897     foreach my $chain (sort keys %$active_chains) {
1898         if (!defined($ruleset->{$chain})) {
1899             my $sig = $active_chains->{$chain};
1900             $statushash->{$chain}->{action} = 'delete';
1901             $statushash->{$chain}->{sig} = $sig;
1902             print "delete $chain ($sig)\n" if $verbose;
1903         }
1904     }
1905
1906     return $statushash;
1907 }
1908
1909 sub print_ruleset {
1910     my ($ruleset) = @_;
1911
1912     get_ruleset_status($ruleset, 1);
1913 }
1914
1915 sub print_sig_rule {
1916     my ($chain, $sig) = @_;
1917
1918     # We just use this to store a SHA1 checksum used to detect changes
1919     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
1920 }
1921
1922 sub get_rulset_cmdlist {
1923     my ($ruleset, $verbose) = @_;
1924
1925     my $cmdlist = "*filter\n"; # we pass this to iptables-restore;
1926
1927     my $statushash = get_ruleset_status($ruleset, $verbose);
1928
1929     # create missing chains first
1930     foreach my $chain (sort keys %$ruleset) {
1931         my $stat = $statushash->{$chain};
1932         die "internal error" if !$stat;
1933         next if $stat->{action} ne 'create';
1934
1935         $cmdlist .= ":$chain - [0:0]\n";
1936     }
1937
1938     my $rule = "INPUT -j PVEFW-INPUT";
1939     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1940         $cmdlist .= "-A $rule\n";
1941     }
1942     $rule = "OUTPUT -j PVEFW-OUTPUT";
1943     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1944         $cmdlist .= "-A $rule\n";
1945     }
1946
1947     $rule = "FORWARD -j PVEFW-FORWARD";
1948     if (!PVE::Firewall::iptables_rule_exist($rule)) {
1949         $cmdlist .= "-A $rule\n";
1950     }
1951
1952     foreach my $chain (sort keys %$ruleset) {
1953         my $stat = $statushash->{$chain};
1954         die "internal error" if !$stat;
1955
1956         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
1957             $cmdlist .= "-F $chain\n";
1958             foreach my $cmd (@{$ruleset->{$chain}}) {
1959                 $cmdlist .= "$cmd\n";
1960             }
1961             $cmdlist .= print_sig_rule($chain, $stat->{sig});
1962         } elsif ($stat->{action} eq 'delete') {
1963             die "internal error"; # this should not happen
1964         } elsif ($stat->{action} eq 'exists') {
1965             # do nothing
1966         } else {
1967             die "internal error - unknown status '$stat->{action}'";
1968         }
1969     }
1970
1971     foreach my $chain (keys %$statushash) {
1972         next if $statushash->{$chain}->{action} ne 'delete';
1973         $cmdlist .= "-F $chain\n";
1974     }
1975     foreach my $chain (keys %$statushash) {
1976         next if $statushash->{$chain}->{action} ne 'delete';
1977         next if $chain eq 'PVEFW-INPUT';
1978         next if $chain eq 'PVEFW-OUTPUT';
1979         next if $chain eq 'PVEFW-FORWARD';
1980         $cmdlist .= "-X $chain\n";
1981     }
1982
1983     $cmdlist .= "COMMIT\n";
1984
1985     return $cmdlist;
1986 }
1987
1988 sub apply_ruleset {
1989     my ($ruleset, $hostfw_conf, $verbose) = @_;
1990
1991     enable_bridge_firewall();
1992
1993     update_nf_conntrack_max($hostfw_conf);
1994
1995     my $cmdlist = get_rulset_cmdlist($ruleset, $verbose);
1996
1997     print $cmdlist if $verbose;
1998
1999     iptables_restore_cmdlist($cmdlist);
2000
2001     # test: re-read status and check if everything is up to date
2002     my $statushash = get_ruleset_status($ruleset);
2003
2004     my $errors;
2005     foreach my $chain (sort keys %$ruleset) {
2006         my $stat = $statushash->{$chain};
2007         if ($stat->{action} ne 'exists') {
2008             warn "unable to update chain '$chain'\n";
2009             $errors = 1;
2010         }
2011     }
2012
2013     die "unable to apply firewall changes\n" if $errors;
2014 }
2015
2016 sub update_nf_conntrack_max {
2017     my ($hostfw_conf) = @_;
2018
2019     my $max = 65536; # reasonable default
2020
2021     my $options = $hostfw_conf->{options} || {};
2022
2023     if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
2024         $max = $options->{nf_conntrack_max};
2025         $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
2026     }
2027
2028     my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
2029     my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
2030
2031     my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
2032
2033     if ($current != $max) {
2034         my $hashsize = int($max/4);
2035         PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
2036         PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
2037     }
2038 }
2039
2040 sub update {
2041     my ($start, $verbose) = @_;
2042
2043     my $code = sub {
2044         my $status = read_pvefw_status();
2045
2046         my ($ruleset, $hostfw_conf) = PVE::Firewall::compile();
2047
2048         if ($start || $status eq 'active') {
2049
2050             save_pvefw_status('active') if ($status ne 'active');
2051
2052             apply_ruleset($ruleset, $hostfw_conf, $verbose);
2053         } else {
2054             print "Firewall not active (status = $status)\n" if $verbose;
2055         }
2056     };
2057
2058     run_locked($code);
2059 }
2060
2061
2062 1;