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