src/PVE/Firewall.pm

   1 package PVE::Firewall;
   2
   3 use warnings;
   4 use strict;
   5
   6 use Digest::SHA;
   7 use Encode;
   8 use File::Basename;
   9 use File::Path;
  10 use IO::File;
  11 use Net::IP;
  12 use POSIX;
  13 use Socket qw(AF_INET AF_INET6 inet_ntop inet_pton);
  14 use Storable qw(dclone);
  15
  16 use PVE::Cluster;
  17 use PVE::Corosync;
  18 use PVE::Exception qw(raise raise_param_exc);
  19 use PVE::INotify;
  20 use PVE::JSONSchema qw(register_standard_option get_standard_option);
  21 use PVE::Network;
  22 use PVE::ProcFSTools;
  23 use PVE::SafeSyslog;
  24 use PVE::Tools qw($IPV4RE $IPV6RE);
  25 use PVE::Tools qw(run_command lock_file dir_glob_foreach);
  26
  27 use PVE::Firewall::Helpers;
  28
  29 my $pvefw_conf_dir = "/etc/pve/firewall";
  30 my $clusterfw_conf_filename = "$pvefw_conf_dir/cluster.fw";
  31
  32 # dynamically include PVE::QemuServer and PVE::LXC
  33 # to avoid dependency problems
  34 my $have_qemu_server;
  35 eval {
  36     require PVE::QemuServer;
  37     require PVE::QemuConfig;
  38     $have_qemu_server = 1;
  39 };
  40
  41 my $have_lxc;
  42 eval {
  43     require PVE::LXC;
  44     $have_lxc = 1;
  45 };
  46
  47 my $pve_fw_status_dir = "/var/lib/pve-firewall";
  48
  49 mkdir $pve_fw_status_dir; # make sure this exists
  50
  51 my $security_group_name_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  52 my $ipset_name_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  53 our $ip_alias_pattern = '[A-Za-z][A-Za-z0-9\-\_]+';
  54
  55 my $max_alias_name_length = 64;
  56 my $max_ipset_name_length = 64;
  57 my $max_group_name_length = 18;
  58
  59 my $PROTOCOLS_WITH_PORTS = {
  60     udp => 1,     17 => 1,
  61     udplite => 1, 136 => 1,
  62     tcp => 1,     6 => 1,
  63     dccp => 1,    33 => 1,
  64     sctp => 1,    132 => 1,
  65 };
  66
  67 PVE::JSONSchema::register_format('IPorCIDR', \&pve_verify_ip_or_cidr);
  68 sub pve_verify_ip_or_cidr {
  69     my ($cidr, $noerr) = @_;
  70
  71     if ($cidr =~ m!^(?:$IPV6RE|$IPV4RE)(/(\d+))?$!) {
  72         return $cidr if Net::IP->new($cidr);
  73         return undef if $noerr;
  74         die Net::IP::Error() . "\n";
  75     }
  76     return undef if $noerr;
  77     die "value does not look like a valid IP address or CIDR network\n";
  78 }
  79
  80 PVE::JSONSchema::register_format('IPorCIDRorAlias', \&pve_verify_ip_or_cidr_or_alias);
  81 sub pve_verify_ip_or_cidr_or_alias {
  82     my ($cidr, $noerr) = @_;
  83
  84     return if $cidr =~ m/^(?:$ip_alias_pattern)$/;
  85
  86     return pve_verify_ip_or_cidr($cidr, $noerr);
  87 }
  88
  89 PVE::JSONSchema::register_standard_option('ipset-name', {
  90     description => "IP set name.",
  91     type => 'string',
  92     pattern => $ipset_name_pattern,
  93     minLength => 2,
  94     maxLength => $max_ipset_name_length,
  95 });
  96
  97 PVE::JSONSchema::register_standard_option('pve-fw-alias', {
  98     description => "Alias name.",
  99     type => 'string',
 100     pattern => $ip_alias_pattern,
 101     minLength => 2,
 102     maxLength => $max_alias_name_length,
 103 });
 104
 105 PVE::JSONSchema::register_standard_option('pve-fw-loglevel' => {
 106     description => "Log level.",
 107     type => 'string',
 108     enum => ['emerg', 'alert', 'crit', 'err', 'warning', 'notice', 'info', 'debug', 'nolog'],
 109     optional => 1,
 110 });
 111
 112 PVE::JSONSchema::register_standard_option('pve-security-group-name', {
 113     description => "Security Group name.",
 114     type => 'string',
 115     pattern => $security_group_name_pattern,
 116     minLength => 2,
 117     maxLength => $max_group_name_length,
 118 });
 119
 120 my $feature_ipset_nomatch = 0;
 121 eval  {
 122     my (undef, undef, $release) = POSIX::uname();
 123     if ($release =~ m/^(\d+)\.(\d+)\.\d+-/) {
 124         my ($major, $minor) = ($1, $2);
 125         $feature_ipset_nomatch = 1 if ($major > 3) ||
 126             ($major == 3 && $minor >= 7);
 127     }
 128
 129 };
 130
 131 my $nodename = PVE::INotify::nodename();
 132 my $hostfw_conf_filename = "/etc/pve/nodes/$nodename/host.fw";
 133
 134 my $pve_fw_lock_filename = "/var/lock/pvefw.lck";
 135
 136 my $default_log_level = 'nolog'; # avoid logs by default
 137 my $global_log_ratelimit = '--limit 1/sec';
 138
 139 my $log_level_hash = {
 140     debug => 7,
 141     info => 6,
 142     notice => 5,
 143     warning => 4,
 144     err => 3,
 145     crit => 2,
 146     alert => 1,
 147     emerg => 0,
 148 };
 149
 150 my $verbose = 0;
 151 sub set_verbose {
 152     $verbose = shift;
 153 }
 154
 155 # %rule
 156 #
 157 # name => optional
 158 # enable => [0|1]
 159 # action =>
 160 # proto =>
 161 # sport => port[,port[,port]].. or port:port
 162 # dport => port[,port[,port]].. or port:port
 163 # log => optional, loglevel
 164 # logmsg => optional, logmsg - overwrites default
 165 # iface_in => incomin interface
 166 # iface_out => outgoing interface
 167 # match => optional, overwrites generation of match
 168 # target => optional, overwrites action
 169
 170 # we need to overwrite some macros for ipv6
 171 my $pve_ipv6fw_macros = {
 172     'Ping' => [
 173         { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
 174     ],
 175     'NeighborDiscovery' => [
 176         "IPv6 neighbor solicitation, neighbor and router advertisement",
 177         { action => 'PARAM', proto => 'icmpv6', dport => 'router-solicitation' },
 178         { action => 'PARAM', proto => 'icmpv6', dport => 'router-advertisement' },
 179         { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-solicitation' },
 180         { action => 'PARAM', proto => 'icmpv6', dport => 'neighbor-advertisement' },
 181     ],
 182     'DHCPv6' => [
 183         "DHCPv6 traffic",
 184         { action => 'PARAM', proto => 'udp', dport => '546:547', sport => '546:547' },
 185     ],
 186     'Trcrt' => [
 187         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 188         { action => 'PARAM', proto => 'icmpv6', dport => 'echo-request' },
 189     ],
 190  };
 191
 192 # imported/converted from: /usr/share/shorewall/macro.*
 193 my $pve_fw_macros = {
 194     'Amanda' => [
 195         "Amanda Backup",
 196         { action => 'PARAM', proto => 'udp', dport => '10080' },
 197         { action => 'PARAM', proto => 'tcp', dport => '10080' },
 198     ],
 199     'Auth' => [
 200         "Auth (identd) traffic",
 201         { action => 'PARAM', proto => 'tcp', dport => '113' },
 202     ],
 203     'BGP' => [
 204         "Border Gateway Protocol traffic",
 205         { action => 'PARAM', proto => 'tcp', dport => '179' },
 206     ],
 207     'BitTorrent' => [
 208         "BitTorrent traffic for BitTorrent 3.1 and earlier",
 209         { action => 'PARAM', proto => 'tcp', dport => '6881:6889' },
 210         { action => 'PARAM', proto => 'udp', dport => '6881' },
 211     ],
 212     'BitTorrent32' => [
 213         "BitTorrent traffic for BitTorrent 3.2 and later",
 214         { action => 'PARAM', proto => 'tcp', dport => '6881:6999' },
 215         { action => 'PARAM', proto => 'udp', dport => '6881' },
 216     ],
 217     'Ceph' => [
 218         "Ceph Storage Cluster traffic (Ceph Monitors, OSD & MDS Daemons)",
 219         # Legacy port for protocol v1
 220         { action => 'PARAM', proto => 'tcp', dport => '6789' },
 221         # New port for protocol v2
 222         { action => 'PARAM', proto => 'tcp', dport => '3300' },
 223         { action => 'PARAM', proto => 'tcp', dport => '6800:7300' },
 224     ],
 225     'CVS' => [
 226         "Concurrent Versions System pserver traffic",
 227         { action => 'PARAM', proto => 'tcp', dport => '2401' },
 228     ],
 229     'Citrix' => [
 230         "Citrix/ICA traffic (ICA, ICA Browser, CGP)",
 231         { action => 'PARAM', proto => 'tcp', dport => '1494' },
 232         { action => 'PARAM', proto => 'udp', dport => '1604' },
 233         { action => 'PARAM', proto => 'tcp', dport => '2598' },
 234     ],
 235     'DAAP' => [
 236         "Digital Audio Access Protocol traffic (iTunes, Rythmbox daemons)",
 237         { action => 'PARAM', proto => 'tcp', dport => '3689' },
 238         { action => 'PARAM', proto => 'udp', dport => '3689' },
 239     ],
 240     'DCC' => [
 241         "Distributed Checksum Clearinghouse spam filtering mechanism",
 242         { action => 'PARAM', proto => 'tcp', dport => '6277' },
 243     ],
 244     'DHCPfwd' => [
 245         "Forwarded DHCP traffic",
 246         { action => 'PARAM', proto => 'udp', dport => '67:68', sport => '67:68' },
 247     ],
 248     'DNS' => [
 249         "Domain Name System traffic (upd and tcp)",
 250         { action => 'PARAM', proto => 'udp', dport => '53' },
 251         { action => 'PARAM', proto => 'tcp', dport => '53' },
 252     ],
 253     'Distcc' => [
 254         "Distributed Compiler service",
 255         { action => 'PARAM', proto => 'tcp', dport => '3632' },
 256     ],
 257     'FTP' => [
 258         "File Transfer Protocol",
 259         { action => 'PARAM', proto => 'tcp', dport => '21' },
 260     ],
 261     'Finger' => [
 262         "Finger protocol (RFC 742)",
 263         { action => 'PARAM', proto => 'tcp', dport => '79' },
 264     ],
 265     'GNUnet' => [
 266         "GNUnet secure peer-to-peer networking traffic",
 267         { action => 'PARAM', proto => 'tcp', dport => '2086' },
 268         { action => 'PARAM', proto => 'udp', dport => '2086' },
 269         { action => 'PARAM', proto => 'tcp', dport => '1080' },
 270         { action => 'PARAM', proto => 'udp', dport => '1080' },
 271     ],
 272     'GRE' => [
 273         "Generic Routing Encapsulation tunneling protocol",
 274         { action => 'PARAM', proto => '47' },
 275     ],
 276     'Git' => [
 277         "Git distributed revision control traffic",
 278         { action => 'PARAM', proto => 'tcp', dport => '9418' },
 279     ],
 280     'HKP' => [
 281         "OpenPGP HTTP key server protocol traffic",
 282         { action => 'PARAM', proto => 'tcp', dport => '11371' },
 283     ],
 284     'HTTP' => [
 285         "Hypertext Transfer Protocol (WWW)",
 286         { action => 'PARAM', proto => 'tcp', dport => '80' },
 287     ],
 288     'HTTPS' => [
 289         "Hypertext Transfer Protocol (WWW) over SSL",
 290         { action => 'PARAM', proto => 'tcp', dport => '443' },
 291     ],
 292     'ICPV2' => [
 293         "Internet Cache Protocol V2 (Squid) traffic",
 294         { action => 'PARAM', proto => 'udp', dport => '3130' },
 295     ],
 296     'ICQ' => [
 297         "AOL Instant Messenger traffic",
 298         { action => 'PARAM', proto => 'tcp', dport => '5190' },
 299     ],
 300     'IMAP' => [
 301         "Internet Message Access Protocol",
 302         { action => 'PARAM', proto => 'tcp', dport => '143' },
 303     ],
 304     'IMAPS' => [
 305         "Internet Message Access Protocol over SSL",
 306         { action => 'PARAM', proto => 'tcp', dport => '993' },
 307     ],
 308     'IPIP' => [
 309         "IPIP capsulation traffic",
 310         { action => 'PARAM', proto => '94' },
 311     ],
 312     'IPsec' => [
 313         "IPsec traffic",
 314         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 315         { action => 'PARAM', proto => '50' },
 316     ],
 317     'IPsecah' => [
 318         "IPsec authentication (AH) traffic",
 319         { action => 'PARAM', proto => 'udp', dport => '500', sport => '500' },
 320         { action => 'PARAM', proto => '51' },
 321     ],
 322     'IPsecnat' => [
 323         "IPsec traffic and Nat-Traversal",
 324         { action => 'PARAM', proto => 'udp', dport => '500' },
 325         { action => 'PARAM', proto => 'udp', dport => '4500' },
 326         { action => 'PARAM', proto => '50' },
 327     ],
 328     'IRC' => [
 329         "Internet Relay Chat traffic",
 330         { action => 'PARAM', proto => 'tcp', dport => '6667' },
 331     ],
 332     'Jetdirect' => [
 333         "HP Jetdirect printing",
 334         { action => 'PARAM', proto => 'tcp', dport => '9100' },
 335     ],
 336     'L2TP' => [
 337         "Layer 2 Tunneling Protocol traffic",
 338         { action => 'PARAM', proto => 'udp', dport => '1701' },
 339     ],
 340     'LDAP' => [
 341         "Lightweight Directory Access Protocol traffic",
 342         { action => 'PARAM', proto => 'tcp', dport => '389' },
 343     ],
 344     'LDAPS' => [
 345         "Secure Lightweight Directory Access Protocol traffic",
 346         { action => 'PARAM', proto => 'tcp', dport => '636' },
 347     ],
 348     'MSNP' => [
 349         "Microsoft Notification Protocol",
 350         { action => 'PARAM', proto => 'tcp', dport => '1863' },
 351     ],
 352     'MSSQL' => [
 353         "Microsoft SQL Server",
 354         { action => 'PARAM', proto => 'tcp', dport => '1433' },
 355     ],
 356     'Mail' => [
 357         "Mail traffic (SMTP, SMTPS, Submission)",
 358         { action => 'PARAM', proto => 'tcp', dport => '25' },
 359         { action => 'PARAM', proto => 'tcp', dport => '465' },
 360         { action => 'PARAM', proto => 'tcp', dport => '587' },
 361     ],
 362     'MDNS' => [
 363         "Multicast DNS",
 364         { action => 'PARAM', proto => 'udp', dport => '5353' },
 365     ],
 366     'Munin' => [
 367         "Munin networked resource monitoring traffic",
 368         { action => 'PARAM', proto => 'tcp', dport => '4949' },
 369     ],
 370     'MySQL' => [
 371         "MySQL server",
 372         { action => 'PARAM', proto => 'tcp', dport => '3306' },
 373     ],
 374     'NNTP' => [
 375         "NNTP traffic (Usenet).",
 376         { action => 'PARAM', proto => 'tcp', dport => '119' },
 377     ],
 378     'NNTPS' => [
 379         "Encrypted NNTP traffic (Usenet)",
 380         { action => 'PARAM', proto => 'tcp', dport => '563' },
 381     ],
 382     'NTP' => [
 383         "Network Time Protocol (ntpd)",
 384         { action => 'PARAM', proto => 'udp', dport => '123' },
 385     ],
 386     'OSPF' => [
 387         "OSPF multicast traffic",
 388         { action => 'PARAM', proto => '89' },
 389     ],
 390     'OpenVPN' => [
 391         "OpenVPN traffic",
 392         { action => 'PARAM', proto => 'udp', dport => '1194' },
 393     ],
 394     'PCA' => [
 395         "Symantec PCAnywere (tm)",
 396         { action => 'PARAM', proto => 'udp', dport => '5632' },
 397         { action => 'PARAM', proto => 'tcp', dport => '5631' },
 398     ],
 399     'PMG' => [
 400         "Proxmox Mail Gateway web interface",
 401         { action => 'PARAM', proto => 'tcp', dport => '8006' },
 402     ],
 403     'POP3' => [
 404         "POP3 traffic",
 405         { action => 'PARAM', proto => 'tcp', dport => '110' },
 406     ],
 407     'POP3S' => [
 408         "Encrypted POP3 traffic",
 409         { action => 'PARAM', proto => 'tcp', dport => '995' },
 410     ],
 411     'PPtP' => [
 412         "Point-to-Point Tunneling Protocol",
 413         { action => 'PARAM', proto => '47' },
 414         { action => 'PARAM', proto => 'tcp', dport => '1723' },
 415     ],
 416     'Ping' => [
 417         "ICMP echo request",
 418         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 419     ],
 420     'PostgreSQL' => [
 421         "PostgreSQL server",
 422         { action => 'PARAM', proto => 'tcp', dport => '5432' },
 423     ],
 424     'Printer' => [
 425         "Line Printer protocol printing",
 426         { action => 'PARAM', proto => 'tcp', dport => '515' },
 427     ],
 428     'RDP' => [
 429         "Microsoft Remote Desktop Protocol traffic",
 430         { action => 'PARAM', proto => 'tcp', dport => '3389' },
 431     ],
 432     'RIP' => [
 433         "Routing Information Protocol (bidirectional)",
 434         { action => 'PARAM', proto => 'udp', dport => '520' },
 435     ],
 436     'RNDC' => [
 437         "BIND remote management protocol",
 438         { action => 'PARAM', proto => 'tcp', dport => '953' },
 439     ],
 440     'Razor' => [
 441         "Razor Antispam System",
 442         { action => 'PARAM', proto => 'tcp', dport => '2703' },
 443     ],
 444     'Rdate' => [
 445         "Remote time retrieval (rdate)",
 446         { action => 'PARAM', proto => 'tcp', dport => '37' },
 447     ],
 448     'Rsync' => [
 449         "Rsync server",
 450         { action => 'PARAM', proto => 'tcp', dport => '873' },
 451     ],
 452     'SANE' => [
 453         "SANE network scanning",
 454         { action => 'PARAM', proto => 'tcp', dport => '6566' },
 455     ],
 456     'SMB' => [
 457         "Microsoft SMB traffic",
 458         { action => 'PARAM', proto => 'udp', dport => '135,445' },
 459         { action => 'PARAM', proto => 'udp', dport => '137:139' },
 460         { action => 'PARAM', proto => 'udp', dport => '1024:65535', sport => '137' },
 461         { action => 'PARAM', proto => 'tcp', dport => '135,139,445' },
 462     ],
 463     'SMBswat' => [
 464         "Samba Web Administration Tool",
 465         { action => 'PARAM', proto => 'tcp', dport => '901' },
 466     ],
 467     'SMTP' => [
 468         "Simple Mail Transfer Protocol",
 469         { action => 'PARAM', proto => 'tcp', dport => '25' },
 470     ],
 471     'SMTPS' => [
 472         "Encrypted Simple Mail Transfer Protocol",
 473         { action => 'PARAM', proto => 'tcp', dport => '465' },
 474     ],
 475     'SNMP' => [
 476         "Simple Network Management Protocol",
 477         { action => 'PARAM', proto => 'udp', dport => '161:162' },
 478         { action => 'PARAM', proto => 'tcp', dport => '161' },
 479     ],
 480     'SPAMD' => [
 481         "Spam Assassin SPAMD traffic",
 482         { action => 'PARAM', proto => 'tcp', dport => '783' },
 483     ],
 484     'SSH' => [
 485         "Secure shell traffic",
 486         { action => 'PARAM', proto => 'tcp', dport => '22' },
 487     ],
 488     'SVN' => [
 489         "Subversion server (svnserve)",
 490         { action => 'PARAM', proto => 'tcp', dport => '3690' },
 491     ],
 492     'SixXS' => [
 493         "SixXS IPv6 Deployment and Tunnel Broker",
 494         { action => 'PARAM', proto => 'tcp', dport => '3874' },
 495         { action => 'PARAM', proto => 'udp', dport => '3740' },
 496         { action => 'PARAM', proto => '41' },
 497         { action => 'PARAM', proto => 'udp', dport => '5072,8374' },
 498     ],
 499     'SPICEproxy' => [
 500         "Proxmox VE SPICE display proxy traffic",
 501         { action => 'PARAM', proto => 'tcp', dport => '3128' },
 502     ],
 503     'Squid' => [
 504         "Squid web proxy traffic",
 505         { action => 'PARAM', proto => 'tcp', dport => '3128' },
 506     ],
 507     'Submission' => [
 508         "Mail message submission traffic",
 509         { action => 'PARAM', proto => 'tcp', dport => '587' },
 510     ],
 511     'Syslog' => [
 512         "Syslog protocol (RFC 5424) traffic",
 513         { action => 'PARAM', proto => 'udp', dport => '514' },
 514         { action => 'PARAM', proto => 'tcp', dport => '514' },
 515     ],
 516     'TFTP' => [
 517         "Trivial File Transfer Protocol traffic",
 518         { action => 'PARAM', proto => 'udp', dport => '69' },
 519     ],
 520     'Telnet' => [
 521         "Telnet traffic",
 522         { action => 'PARAM', proto => 'tcp', dport => '23' },
 523     ],
 524     'Telnets' => [
 525         "Telnet over SSL",
 526         { action => 'PARAM', proto => 'tcp', dport => '992' },
 527     ],
 528     'Time' => [
 529         "RFC 868 Time protocol",
 530         { action => 'PARAM', proto => 'tcp', dport => '37' },
 531     ],
 532     'Trcrt' => [
 533         "Traceroute (for up to 30 hops) traffic",
 534         { action => 'PARAM', proto => 'udp', dport => '33434:33524' },
 535         { action => 'PARAM', proto => 'icmp', dport => 'echo-request' },
 536     ],
 537     'VNC' => [
 538         "VNC traffic for VNC display's 0 - 99",
 539         { action => 'PARAM', proto => 'tcp', dport => '5900:5999' },
 540     ],
 541     'VNCL' => [
 542         "VNC traffic from Vncservers to Vncviewers in listen mode",
 543         { action => 'PARAM', proto => 'tcp', dport => '5500' },
 544     ],
 545     'Web' => [
 546         "WWW traffic (HTTP and HTTPS)",
 547         { action => 'PARAM', proto => 'tcp', dport => '80' },
 548         { action => 'PARAM', proto => 'tcp', dport => '443' },
 549     ],
 550     'Webcache' => [
 551         "Web Cache/Proxy traffic (port 8080)",
 552         { action => 'PARAM', proto => 'tcp', dport => '8080' },
 553     ],
 554     'Webmin' => [
 555         "Webmin traffic",
 556         { action => 'PARAM', proto => 'tcp', dport => '10000' },
 557     ],
 558     'Whois' => [
 559         "Whois (nicname, RFC 3912) traffic",
 560         { action => 'PARAM', proto => 'tcp', dport => '43' },
 561     ],
 562 };
 563
 564 my $pve_fw_parsed_macros;
 565 my $pve_fw_macro_descr;
 566 my $pve_fw_macro_ipversion = {};
 567 my $pve_fw_preferred_macro_names = {};
 568
 569 my $FWACCEPTMARK_ON  = "0x80000000/0x80000000";
 570 my $FWACCEPTMARK_OFF = "0x00000000/0x80000000";
 571
 572 my $pve_std_chains = {};
 573 my $pve_std_chains_conf = {};
 574 $pve_std_chains_conf->{4} = {
 575     'PVEFW-SET-ACCEPT-MARK' => [
 576         { target => "-j MARK --set-mark $FWACCEPTMARK_ON" },
 577     ],
 578     'PVEFW-DropBroadcast' => [
 579         # same as shorewall 'Broadcast'
 580         # simply DROP BROADCAST/MULTICAST/ANYCAST
 581         # we can use this to reduce logging
 582         { action => 'DROP', dsttype => 'BROADCAST' },
 583         { action => 'DROP', dsttype => 'MULTICAST' },
 584         { action => 'DROP', dsttype => 'ANYCAST' },
 585         { action => 'DROP', dest => '224.0.0.0/4' },
 586     ],
 587     'PVEFW-reject' => [
 588         # same as shorewall 'reject'
 589         { action => 'DROP', dsttype => 'BROADCAST' },
 590         { action => 'DROP', source => '224.0.0.0/4' },
 591         { action => 'DROP', proto => 'icmp' },
 592         { match => '-p tcp', target => '-j REJECT --reject-with tcp-reset' },
 593         { match => '-p udp', target => '-j REJECT --reject-with icmp-port-unreachable' },
 594         { match => '-p icmp', target => '-j REJECT --reject-with icmp-host-unreachable' },
 595         { target => '-j REJECT --reject-with icmp-host-prohibited' },
 596     ],
 597     'PVEFW-Drop' => [
 598         # same as shorewall 'Drop', which is equal to DROP,
 599         # but REJECT/DROP some packages to reduce logging,
 600         # and ACCEPT critical ICMP types
 601         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 602         { action => 'PVEFW-DropBroadcast' },
 603         # ACCEPT critical ICMP types
 604         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 605         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 606         # Drop packets with INVALID state
 607         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 608         # Drop Microsoft SMB noise
 609         { action => 'DROP', proto => 'udp', dport => '135,445' },
 610         { action => 'DROP', proto => 'udp', dport => '137:139' },
 611         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 612         { action => 'DROP', proto => 'tcp', dport => '135,139,445' },
 613         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 614         # Drop new/NotSyn traffic so that it doesn't get logged
 615         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 616         # Drop DNS replies
 617         { action => 'DROP', proto => 'udp', sport => 53 },
 618     ],
 619     'PVEFW-Reject' => [
 620         # same as shorewall 'Reject', which is equal to Reject,
 621         # but REJECT/DROP some packages to reduce logging,
 622         # and ACCEPT critical ICMP types
 623         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 624         { action => 'PVEFW-DropBroadcast' },
 625         # ACCEPT critical ICMP types
 626         { action => 'ACCEPT', proto => 'icmp', dport => 'fragmentation-needed' },
 627         { action => 'ACCEPT', proto => 'icmp', dport => 'time-exceeded' },
 628         # Drop packets with INVALID state
 629         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 630         # Drop Microsoft SMB noise
 631         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445' },
 632         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139'},
 633         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 634         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445' },
 635         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 636         # Drop new/NotSyn traffic so that it doesn't get logged
 637         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 638         # Drop DNS replies
 639         { action => 'DROP', proto => 'udp', sport => 53 },
 640     ],
 641     'PVEFW-tcpflags' => [
 642         # same as shorewall tcpflags action.
 643         # Packets arriving on this interface are checked for some illegal combinations of TCP flags
 644         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG', target => '-g PVEFW-logflags' },
 645         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE', target => '-g PVEFW-logflags' },
 646         { match => '-p tcp -m tcp --tcp-flags SYN,RST SYN,RST', target => '-g PVEFW-logflags' },
 647         { match => '-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN', target => '-g PVEFW-logflags' },
 648         { match => '-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN', target => '-g PVEFW-logflags' },
 649     ],
 650     'PVEFW-smurfs' => [
 651         # same as shorewall smurfs action
 652         # Filter packets for smurfs (packets with a broadcast address as the source).
 653         { match => '-s 0.0.0.0/32', target => '-j RETURN' }, # allow DHCP
 654         { match => '-m addrtype --src-type BROADCAST', target => '-g PVEFW-smurflog' },
 655         { match => '-s 224.0.0.0/4', target => '-g PVEFW-smurflog' },
 656     ],
 657     'PVEFW-smurflog' => [
 658         { action => 'DROP', logmsg => 'DROP: ' },
 659     ],
 660     'PVEFW-logflags' => [
 661         { action => 'DROP', logmsg => 'DROP: ' },
 662     ],
 663 };
 664
 665 $pve_std_chains_conf->{6} = {
 666     'PVEFW-SET-ACCEPT-MARK' => [
 667         { target => "-j MARK --set-mark $FWACCEPTMARK_ON" },
 668     ],
 669     'PVEFW-DropBroadcast' => [
 670         # same as shorewall 'Broadcast'
 671         # simply DROP BROADCAST/MULTICAST/ANYCAST
 672         # we can use this to reduce logging
 673         #{ action => 'DROP', dsttype => 'BROADCAST' }, #no broadcast in ipv6
 674         # ipv6 addrtype does not work with kernel 2.6.32
 675         #{ action => 'DROP', dsttype => 'MULTICAST' },
 676         #{ action => 'DROP', dsttype => 'ANYCAST' },
 677         { action => 'DROP', dest => 'ff00::/8' },
 678         #{ action => 'DROP', dest => '224.0.0.0/4' },
 679     ],
 680     'PVEFW-reject' => [
 681         { action => 'DROP', proto => 'icmpv6' },
 682         { match => '-p tcp', target => '-j REJECT --reject-with tcp-reset' },
 683         { match => '-p udp', target => '-j REJECT --reject-with icmp6-port-unreachable' },
 684         { target => '-j REJECT --reject-with icmp6-adm-prohibited' },
 685     ],
 686     'PVEFW-Drop' => [
 687         # same as shorewall 'Drop', which is equal to DROP,
 688         # but REJECT/DROP some packages to reduce logging,
 689         # and ACCEPT critical ICMP types
 690         { action => 'PVEFW-reject', proto => 'tcp', dport => '43' }, # REJECT 'auth'
 691         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 692         { action => 'PVEFW-DropBroadcast' },
 693         # ACCEPT critical ICMP types
 694         { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
 695         { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
 696         { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
 697         # Drop packets with INVALID state
 698         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 699         # Drop Microsoft SMB noise
 700         { action => 'DROP', proto => 'udp', dport => '135,445' },
 701         { action => 'DROP', proto => 'udp', dport => '137:139'},
 702         { action => 'DROP', proto => 'udp', dport => '1024:65535', sport => 137 },
 703         { action => 'DROP', proto => 'tcp', dport => '135,139,445' },
 704         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 705         # Drop new/NotSyn traffic so that it doesn't get logged
 706         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 707         # Drop DNS replies
 708         { action => 'DROP', proto => 'udp', sport => 53 },
 709     ],
 710     'PVEFW-Reject' => [
 711         # same as shorewall 'Reject', which is equal to Reject,
 712         # but REJECT/DROP some packages to reduce logging,
 713         # and ACCEPT critical ICMP types
 714         { action => 'PVEFW-reject',  proto => 'tcp', dport => '43' }, # REJECT 'auth'
 715         # we are not interested in BROADCAST/MULTICAST/ANYCAST
 716         { action => 'PVEFW-DropBroadcast' },
 717         # ACCEPT critical ICMP types
 718         { action => 'ACCEPT', proto => 'icmpv6', dport => 'destination-unreachable' },
 719         { action => 'ACCEPT', proto => 'icmpv6', dport => 'time-exceeded' },
 720         { action => 'ACCEPT', proto => 'icmpv6', dport => 'packet-too-big' },
 721         # Drop packets with INVALID state
 722         { action => 'DROP', match => '-m conntrack --ctstate INVALID', },
 723         # Drop Microsoft SMB noise
 724         { action => 'PVEFW-reject', proto => 'udp', dport => '135,445' },
 725         { action => 'PVEFW-reject', proto => 'udp', dport => '137:139' },
 726         { action => 'PVEFW-reject', proto => 'udp', dport => '1024:65535', sport => 137 },
 727         { action => 'PVEFW-reject', proto => 'tcp', dport => '135,139,445' },
 728         { action => 'DROP', proto => 'udp', dport => 1900 }, # UPnP
 729         # Drop new/NotSyn traffic so that it doesn't get logged
 730         { action => 'DROP', match => '-p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN' },
 731         # Drop DNS replies
 732         { action => 'DROP', proto => 'udp', sport => 53 },
 733     ],
 734     'PVEFW-tcpflags' => [
 735         # same as shorewall tcpflags action.
 736         # Packets arriving on this interface are checked for some illegal combinations of TCP flags
 737         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG', target => '-g PVEFW-logflags' },
 738         { match => '-p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE', target => '-g PVEFW-logflags' },
 739         { match => '-p tcp -m tcp --tcp-flags SYN,RST SYN,RST', target => '-g PVEFW-logflags' },
 740         { match => '-p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN', target => '-g PVEFW-logflags' },
 741         { match => '-p tcp -m tcp --sport 0 --tcp-flags FIN,SYN,RST,ACK SYN', target => '-g PVEFW-logflags' },
 742     ],
 743     'PVEFW-logflags' => [
 744         { action => 'DROP', logmsg => 'DROP: ' },
 745     ],
 746 };
 747
 748 # iptables -p icmp -h
 749 my $icmp_type_names = {
 750     any => 1,
 751     'echo-reply' => 1,
 752     'destination-unreachable' => 1,
 753     'network-unreachable' => 1,
 754     'host-unreachable' => 1,
 755     'protocol-unreachable' => 1,
 756     'port-unreachable' => 1,
 757     'fragmentation-needed' => 1,
 758     'source-route-failed' => 1,
 759     'network-unknown' => 1,
 760     'host-unknown' => 1,
 761     'network-prohibited' => 1,
 762     'host-prohibited' => 1,
 763     'TOS-network-unreachable' => 1,
 764     'TOS-host-unreachable' => 1,
 765     'communication-prohibited' => 1,
 766     'host-precedence-violation' => 1,
 767     'precedence-cutoff' => 1,
 768     'source-quench' => 1,
 769     'redirect' => 1,
 770     'network-redirect' => 1,
 771     'host-redirect' => 1,
 772     'TOS-network-redirect' => 1,
 773     'TOS-host-redirect' => 1,
 774     'echo-request' => 1,
 775     'router-advertisement' => 1,
 776     'router-solicitation' => 1,
 777     'time-exceeded' => 1,
 778     'ttl-zero-during-transit' => 1,
 779     'ttl-zero-during-reassembly' => 1,
 780     'parameter-problem' => 1,
 781     'ip-header-bad' => 1,
 782     'required-option-missing' => 1,
 783     'timestamp-request' => 1,
 784     'timestamp-reply' => 1,
 785     'address-mask-request' => 1,
 786     'address-mask-reply' => 1,
 787 };
 788
 789 # ip6tables -p icmpv6 -h
 790
 791 my $icmpv6_type_names = {
 792     'destination-unreachable' => 1,
 793     'no-route' => 1,
 794     'communication-prohibited' => 1,
 795     'beyond-scope' => 1,
 796     'address-unreachable' => 1,
 797     'port-unreachable' => 1,
 798     'failed-policy' => 1,
 799     'reject-route' => 1,
 800     'packet-too-big' => 1,
 801     'time-exceeded' => 1,
 802     'ttl-zero-during-transit' => 1,
 803     'ttl-zero-during-reassembly' => 1,
 804     'parameter-problem' => 1,
 805     'bad-header' => 1,
 806     'unknown-header-type' => 1,
 807     'unknown-option' => 1,
 808     'echo-request' => 1,
 809     'echo-reply' => 1,
 810     'router-solicitation' => 1,
 811     'router-advertisement' => 1,
 812     'neighbor-solicitation' => 1,
 813     'neighbour-solicitation' => 1,
 814     'neighbor-advertisement' => 1,
 815     'neighbour-advertisement' => 1,
 816     'redirect' => 1,
 817 };
 818
 819 my $is_valid_icmp_type = sub {
 820     my ($type, $valid_types) = @_;
 821
 822     if ($type =~ m/^\d+$/) {
 823         # values for icmp-type range between 0 and 255 (8 bit field)
 824         die "invalid icmp-type '$type'\n" if $type > 255;
 825     } else {
 826         die "unknown icmp-type '$type'\n" if !defined($valid_types->{$type});
 827     }
 828 };
 829
 830 sub init_firewall_macros {
 831
 832     $pve_fw_parsed_macros = {};
 833
 834     my $parse = sub {
 835         my ($k, $macro) = @_;
 836         my $lc_name = lc($k);
 837         $pve_fw_macro_ipversion->{$k} = 0;
 838         while (!ref($macro->[0])) {
 839             my $desc = shift @$macro;
 840             if ($desc eq 'ipv4only') {
 841                 $pve_fw_macro_ipversion->{$k} = 4;
 842             } elsif ($desc eq 'ipv6only') {
 843                 $pve_fw_macro_ipversion->{$k} = 6;
 844             } else {
 845                 $pve_fw_macro_descr->{$k} = $desc;
 846             }
 847         }
 848         $pve_fw_preferred_macro_names->{$lc_name} = $k;
 849         $pve_fw_parsed_macros->{$k} = $macro;
 850     };
 851
 852     foreach my $k (keys %$pve_fw_macros) {
 853         &$parse($k, $pve_fw_macros->{$k});
 854     }
 855
 856     foreach my $k (keys %$pve_ipv6fw_macros) {
 857         next if $pve_fw_parsed_macros->{$k};
 858         &$parse($k, $pve_ipv6fw_macros->{$k});
 859         $pve_fw_macro_ipversion->{$k} = 6;
 860     }
 861 }
 862
 863 init_firewall_macros();
 864
 865 sub get_macros {
 866     return wantarray ? ($pve_fw_parsed_macros, $pve_fw_macro_descr): $pve_fw_parsed_macros;
 867 }
 868
 869 my $etc_services;
 870
 871 sub get_etc_services {
 872
 873     return $etc_services if $etc_services;
 874
 875     my $filename = "/etc/services";
 876
 877     my $fh = IO::File->new($filename, O_RDONLY);
 878     if (!$fh) {
 879         warn "unable to read '$filename' - $!\n";
 880         return {};
 881     }
 882
 883     my $services = {};
 884
 885     while (my $line = <$fh>) {
 886         chomp ($line);
 887         next if $line =~m/^#/;
 888         next if ($line =~m/^\s*$/);
 889
 890         if ($line =~ m!^(\S+)\s+(\S+)/(tcp|udp|sctp).*$!) {
 891             $services->{byid}->{$2}->{name} = $1;
 892             $services->{byid}->{$2}->{port} = $2;
 893             $services->{byid}->{$2}->{$3} = 1;
 894             $services->{byname}->{$1} = $services->{byid}->{$2};
 895         }
 896     }
 897
 898     close($fh);
 899
 900     $etc_services = $services;
 901
 902
 903     return $etc_services;
 904 }
 905
 906 sub parse_protocol_file {
 907     my ($filename) = @_;
 908
 909     my $fh = IO::File->new($filename, O_RDONLY);
 910     if (!$fh) {
 911         warn "unable to read '$filename' - $!\n";
 912         return {};
 913     }
 914
 915     my $protocols = {};
 916
 917     while (my $line = <$fh>) {
 918         chomp ($line);
 919         next if $line =~m/^#/;
 920         next if ($line =~m/^\s*$/);
 921
 922         if ($line =~ m!^(\S+)\s+(\d+)(?:\s+.*)?$!) {
 923             $protocols->{byid}->{$2}->{name} = $1;
 924             $protocols->{byname}->{$1} = $protocols->{byid}->{$2};
 925         }
 926     }
 927
 928     close($fh);
 929
 930     return $protocols;
 931 }
 932
 933 my $etc_protocols;
 934
 935 sub get_etc_protocols {
 936     return $etc_protocols if $etc_protocols;
 937
 938     my $protocols = parse_protocol_file('/etc/protocols');
 939
 940     # add special case for ICMP v6
 941     $protocols->{byid}->{icmpv6}->{name} = "icmpv6";
 942     $protocols->{byname}->{icmpv6} = $protocols->{byid}->{icmpv6};
 943
 944     $etc_protocols = $protocols;
 945
 946     return $etc_protocols;
 947 }
 948
 949 my $etc_ethertypes;
 950
 951 sub get_etc_ethertypes {
 952     $etc_ethertypes = parse_protocol_file('/etc/ethertypes')
 953         if !$etc_ethertypes;
 954     return $etc_ethertypes;
 955 }
 956
 957 my $__local_network;
 958
 959 sub local_network {
 960     my ($new_value) = @_;
 961
 962     $__local_network = $new_value if defined($new_value);
 963
 964     return $__local_network if defined($__local_network);
 965
 966     eval {
 967         my $nodename = PVE::INotify::nodename();
 968
 969         my $ip = PVE::Cluster::remote_node_ip($nodename);
 970
 971         my $testip = Net::IP->new($ip);
 972
 973         my $isv6 = $testip->version == 6;
 974         my $routes = $isv6 ? PVE::ProcFSTools::read_proc_net_ipv6_route()
 975                            : PVE::ProcFSTools::read_proc_net_route();
 976         foreach my $entry (@$routes) {
 977             my $mask;
 978             if ($isv6) {
 979                 $mask = $entry->{prefix};
 980                 next if !$mask; # skip the default route...
 981             } else {
 982                 $mask = $PVE::Network::ipv4_mask_hash_localnet->{$entry->{mask}};
 983                 next if !defined($mask);
 984             }
 985             my $cidr = "$entry->{dest}/$mask";
 986             my $testnet = Net::IP->new($cidr);
 987             my $overlap = $testnet->overlaps($testip);
 988             if ($overlap == $Net::IP::IP_B_IN_A_OVERLAP ||
 989                 $overlap == $Net::IP::IP_IDENTICAL)
 990             {
 991                 $__local_network = $cidr;
 992                 return;
 993             }
 994         }
 995     };
 996     warn $@ if $@;
 997
 998     return $__local_network;
 999 }
1000
1001 # ipset names are limited to 31 characters,
1002 # and we use '-v4' or '-v6' to indicate IP versions,
1003 # and we use '_swap' suffix for atomic update,
1004 # for example PVEFW-${VMID}-${ipset_name}_swap
1005
1006 my $max_iptables_ipset_name_length = 31 - length("PVEFW-") - length("_swap");
1007
1008 sub compute_ipset_chain_name {
1009     my ($vmid, $ipset_name, $ipversion) = @_;
1010
1011     $vmid = 0 if !defined($vmid);
1012
1013     my $id = "$vmid-${ipset_name}-v$ipversion";
1014
1015     if (length($id) > $max_iptables_ipset_name_length) {
1016         $id = PVE::Tools::fnv31a_hex($id);
1017     }
1018
1019     return "PVEFW-$id";
1020 }
1021
1022 sub compute_ipfilter_ipset_name {
1023     my ($iface) = @_;
1024
1025     return "ipfilter-$iface";
1026 }
1027
1028 sub parse_address_list {
1029     my ($str) = @_;
1030
1031     if ($str =~ m/^(\+)(\S+)$/) { # ipset ref
1032         die "ipset name too long\n" if length($str) > ($max_ipset_name_length + 1);
1033         return;
1034     }
1035
1036     if ($str =~ m/^${ip_alias_pattern}$/) {
1037         die "alias name too long\n" if length($str) > $max_alias_name_length;
1038         return;
1039     }
1040
1041     my $count = 0;
1042     my $iprange = 0;
1043     my $ipversion;
1044
1045     my @elements = split(/,/, $str);
1046     die "extraneous commas in list\n" if $str ne join(',', @elements);
1047     foreach my $elem (@elements) {
1048         $count++;
1049         my $ip = Net::IP->new($elem);
1050         if (!$ip) {
1051             my $err = Net::IP::Error();
1052             die "invalid IP address: $err\n";
1053         }
1054         $iprange = 1 if $elem =~ m/-/;
1055
1056         my $new_ipversion = Net::IP::ip_is_ipv6($ip->ip()) ? 6 : 4;
1057
1058         die "detected mixed ipv4/ipv6 addresses in address list '$str'\n"
1059             if $ipversion && ($new_ipversion != $ipversion);
1060
1061         $ipversion = $new_ipversion;
1062     }
1063
1064     die "you can't use a range in a list\n" if $iprange && $count > 1;
1065
1066     return $ipversion;
1067 }
1068
1069 sub parse_port_name_number_or_range {
1070     my ($str, $dport) = @_;
1071
1072     my $services = PVE::Firewall::get_etc_services();
1073     my $count = 0;
1074     my $icmp_port = 0;
1075
1076     my @elements = split(/,/, $str);
1077     die "extraneous commas in list\n" if $str ne join(',', @elements);
1078     foreach my $item (@elements) {
1079         if ($item =~ m/^([0-9]+):([0-9]+)$/) {
1080             $count += 2;
1081             my ($port1, $port2) = ($1, $2);
1082             die "invalid port '$port1'\n" if $port1 > 65535;
1083             die "invalid port '$port2'\n" if $port2 > 65535;
1084             die "backwards range '$port1:$port2' not allowed, did you mean '$port2:$port1'?\n" if $port1 > $port2;
1085         } elsif ($item =~ m/^([0-9]+)$/) {
1086             $count += 1;
1087             my $port = $1;
1088             die "invalid port '$port'\n" if $port > 65535;
1089         } else {
1090             if ($dport && $icmp_type_names->{$item}) {
1091                 $icmp_port = 1;
1092             } elsif ($dport && $icmpv6_type_names->{$item}) {
1093                 $icmp_port = 1;
1094             } else {
1095                 die "invalid port '$item'\n" if !$services->{byname}->{$item};
1096             }
1097         }
1098     }
1099
1100     die "ICMP ports not allowed in port range\n" if $icmp_port && $count > 0;
1101
1102     # I really don't like to use the word number here, but it's the only thing
1103     # that makes sense in a literal way. The range 1:100 counts as 2, not as
1104     # one and not as 100...
1105     die "too many entries in port list (> 15 numbers)\n"
1106         if $count > 15;
1107
1108     return (scalar(@elements) > 1);
1109 }
1110
1111 PVE::JSONSchema::register_format('pve-fw-sport-spec', \&pve_fw_verify_sport_spec);
1112 sub pve_fw_verify_sport_spec {
1113    my ($portstr) = @_;
1114
1115    parse_port_name_number_or_range($portstr, 0);
1116
1117    return $portstr;
1118 }
1119
1120 PVE::JSONSchema::register_format('pve-fw-dport-spec', \&pve_fw_verify_dport_spec);
1121 sub pve_fw_verify_dport_spec {
1122    my ($portstr) = @_;
1123
1124    parse_port_name_number_or_range($portstr, 1);
1125
1126    return $portstr;
1127 }
1128
1129 PVE::JSONSchema::register_format('pve-fw-addr-spec', \&pve_fw_verify_addr_spec);
1130 sub pve_fw_verify_addr_spec {
1131    my ($list) = @_;
1132
1133    parse_address_list($list);
1134
1135    return $list;
1136 }
1137
1138 PVE::JSONSchema::register_format('pve-fw-protocol-spec', \&pve_fw_verify_protocol_spec);
1139 sub pve_fw_verify_protocol_spec {
1140    my ($proto) = @_;
1141
1142    my $protocols = get_etc_protocols();
1143
1144    die "unknown protocol '$proto'\n" if $proto &&
1145        !(defined($protocols->{byname}->{$proto}) ||
1146          defined($protocols->{byid}->{$proto}));
1147
1148    return $proto;
1149 }
1150
1151 PVE::JSONSchema::register_format('pve-fw-icmp-type-spec', \&pve_fw_verify_icmp_type_spec);
1152 sub pve_fw_verify_icmp_type_spec {
1153     my ($icmp_type) = @_;
1154
1155     if ($icmp_type_names->{$icmp_type} ||  $icmpv6_type_names->{$icmp_type}) {
1156         return $icmp_type;
1157     }
1158
1159     die "invalid icmp-type value '$icmp_type'\n" if $icmp_type ne '';
1160
1161     return $icmp_type;
1162 }
1163
1164
1165 # helper function for API
1166
1167 sub copy_opject_with_digest {
1168     my ($object) = @_;
1169
1170     my $sha = Digest::SHA->new('sha1');
1171
1172     my $res = {};
1173     foreach my $k (sort keys %$object) {
1174         my $v = $object->{$k};
1175         next if !defined($v);
1176         $res->{$k} = $v;
1177         $sha->add($k, ':', $v, "\n");
1178     }
1179
1180     my $digest = $sha->hexdigest;
1181
1182     $res->{digest} = $digest;
1183
1184     return wantarray ? ($res, $digest) : $res;
1185 }
1186
1187 sub copy_list_with_digest {
1188     my ($list) = @_;
1189
1190     my $sha = Digest::SHA->new('sha1');
1191
1192     my $res = [];
1193     foreach my $entry (@$list) {
1194         my $data = {};
1195         foreach my $k (sort keys %$entry) {
1196             my $v = $entry->{$k};
1197             next if !defined($v);
1198             $data->{$k} = $v;
1199             # Note: digest ignores refs ($rule->{errors})
1200             # since Digest::SHA expects a series of bytes,
1201             #  we have to encode the value here to prevent errors when
1202             #  using utf8 characters (eg. in comments)
1203             $sha->add($k, ':', encode_utf8($v), "\n") if !ref($v); ;
1204         }
1205         push @$res, $data;
1206     }
1207
1208     my $digest = $sha->hexdigest;
1209
1210     foreach my $entry (@$res) {
1211         $entry->{digest} = $digest;
1212     }
1213
1214     return wantarray ? ($res, $digest) : $res;
1215 }
1216
1217 our $cluster_option_properties = {
1218     enable => {
1219         description => "Enable or disable the firewall cluster wide.",
1220         type => 'integer',
1221         minimum => 0,
1222         optional => 1,
1223     },
1224     ebtables => {
1225         description => "Enable ebtables rules cluster wide.",
1226         type => 'boolean',
1227         default => 1,
1228         optional => 1,
1229     },
1230     policy_in => {
1231         description => "Input policy.",
1232         type => 'string',
1233         optional => 1,
1234         enum => ['ACCEPT', 'REJECT', 'DROP'],
1235     },
1236     policy_out => {
1237         description => "Output policy.",
1238         type => 'string',
1239         optional => 1,
1240         enum => ['ACCEPT', 'REJECT', 'DROP'],
1241     },
1242     log_ratelimit => {
1243         description => "Log ratelimiting settings",
1244         type => 'string', format => {
1245             enable => {
1246                 default_key => 1,
1247                 description => 'Enable or disable log rate limiting',
1248                 type => 'boolean',
1249                 default => '1',
1250             },
1251             rate => {
1252                 type => 'string',
1253                 description => 'Frequency with which the burst bucket gets refilled',
1254                 optional => 1,
1255                 pattern => '[1-9][0-9]*\/(second|minute|hour|day)',
1256                 format_description => 'rate',
1257                 default => '1/second',
1258             },
1259             burst => {
1260                 type => 'integer',
1261                 minimum => 0,
1262                 optional => 1,
1263                 description => 'Initial burst of packages which will always get logged before the rate is applied',
1264                 default => 5,
1265             },
1266         },
1267         optional => 1,
1268     },
1269 };
1270
1271 our $host_option_properties = {
1272     enable => {
1273         description => "Enable host firewall rules.",
1274         type => 'boolean',
1275         optional => 1,
1276     },
1277     log_level_in =>  get_standard_option('pve-fw-loglevel', {
1278         description => "Log level for incoming traffic." }),
1279     log_level_out =>  get_standard_option('pve-fw-loglevel', {
1280         description => "Log level for outgoing traffic." }),
1281     tcp_flags_log_level =>  get_standard_option('pve-fw-loglevel', {
1282         description => "Log level for illegal tcp flags filter." }),
1283     smurf_log_level =>  get_standard_option('pve-fw-loglevel', {
1284         description => "Log level for SMURFS filter." }),
1285     nosmurfs => {
1286         description => "Enable SMURFS filter.",
1287         type => 'boolean',
1288         optional => 1,
1289     },
1290     tcpflags => {
1291         description => "Filter illegal combinations of TCP flags.",
1292         type => 'boolean',
1293         default => 0,
1294         optional => 1,
1295     },
1296     nf_conntrack_max => {
1297         description => "Maximum number of tracked connections.",
1298         type => 'integer',
1299         optional => 1,
1300         default => 262144,
1301         minimum => 32768,
1302     },
1303     nf_conntrack_tcp_timeout_established => {
1304         description => "Conntrack established timeout.",
1305         type => 'integer',
1306         optional => 1,
1307         default => 432000,
1308         minimum => 7875,
1309     },
1310     nf_conntrack_tcp_timeout_syn_recv => {
1311         description => "Conntrack syn recv timeout.",
1312         type => 'integer',
1313         optional => 1,
1314         default => 60,
1315         minimum => 30,
1316         maximum => 60,
1317     },
1318     ndp => {
1319         description => "Enable NDP (Neighbor Discovery Protocol).",
1320         type => 'boolean',
1321         default => 0,
1322         optional => 1,
1323     },
1324     nf_conntrack_allow_invalid => {
1325         description => "Allow invalid packets on connection tracking.",
1326         type => 'boolean',
1327         default => 0,
1328         optional => 1,
1329     },
1330     protection_synflood => {
1331         description => "Enable synflood protection",
1332         type => 'boolean',
1333         default => 0,
1334         optional => 1,
1335     },
1336     protection_synflood_rate => {
1337         description => "Synflood protection rate syn/sec by ip src.",
1338         type => 'integer',
1339         optional => 1,
1340         default => 200,
1341     },
1342     protection_synflood_burst => {
1343         description => "Synflood protection rate burst by ip src.",
1344         type => 'integer',
1345         optional => 1,
1346         default => 1000,
1347     },
1348     log_nf_conntrack => {
1349         description => "Enable logging of conntrack information.",
1350         type => 'boolean',
1351         default => 0,
1352         optional => 1
1353     },
1354 };
1355
1356 our $vm_option_properties = {
1357     enable => {
1358         description => "Enable/disable firewall rules.",
1359         type => 'boolean',
1360         default => 0,
1361         optional => 1,
1362     },
1363     macfilter => {
1364         description => "Enable/disable MAC address filter.",
1365         type => 'boolean',
1366         default => 1,
1367         optional => 1,
1368     },
1369     dhcp => {
1370         description => "Enable DHCP.",
1371         type => 'boolean',
1372         default => 0,
1373         optional => 1,
1374     },
1375     ndp => {
1376         description => "Enable NDP (Neighbor Discovery Protocol).",
1377         type => 'boolean',
1378         default => 0,
1379         optional => 1,
1380     },
1381     radv => {
1382         description => "Allow sending Router Advertisement.",
1383         type => 'boolean',
1384         optional => 1,
1385     },
1386     ipfilter => {
1387         description => "Enable default IP filters. " .
1388            "This is equivalent to adding an empty ipfilter-net<id> ipset " .
1389            "for every interface. Such ipsets implicitly contain sane default " .
1390            "restrictions such as restricting IPv6 link local addresses to " .
1391            "the one derived from the interface's MAC address. For containers " .
1392            "the configured IP addresses will be implicitly added.",
1393         type => 'boolean',
1394         optional => 1,
1395     },
1396     policy_in => {
1397         description => "Input policy.",
1398         type => 'string',
1399         optional => 1,
1400         enum => ['ACCEPT', 'REJECT', 'DROP'],
1401     },
1402     policy_out => {
1403         description => "Output policy.",
1404         type => 'string',
1405         optional => 1,
1406         enum => ['ACCEPT', 'REJECT', 'DROP'],
1407     },
1408     log_level_in =>  get_standard_option('pve-fw-loglevel', {
1409         description => "Log level for incoming traffic." }),
1410     log_level_out =>  get_standard_option('pve-fw-loglevel', {
1411         description => "Log level for outgoing traffic." }),
1412
1413 };
1414
1415
1416 my $addr_list_descr = "This can refer to a single IP address, an IP set ('+ipsetname') or an IP alias definition. You can also specify an address range like '20.34.101.207-201.3.9.99', or a list of IP addresses and networks (entries are separated by comma). Please do not mix IPv4 and IPv6 addresses inside such lists.";
1417
1418 my $port_descr = "You can use service names or simple numbers (0-65535), as defined in '/etc/services'. Port ranges can be specified with '\\d+:\\d+', for example '80:85', and you can use comma separated list to match several ports or ranges.";
1419
1420 my $rule_properties = {
1421     pos => {
1422         description => "Update rule at position <pos>.",
1423         type => 'integer',
1424         minimum => 0,
1425         optional => 1,
1426     },
1427     digest => get_standard_option('pve-config-digest'),
1428     type => {
1429         description => "Rule type.",
1430         type => 'string',
1431         optional => 1,
1432         enum => ['in', 'out', 'group'],
1433     },
1434     action => {
1435         description => "Rule action ('ACCEPT', 'DROP', 'REJECT') or security group name.",
1436         type => 'string',
1437         optional => 1,
1438         pattern => $security_group_name_pattern,
1439         maxLength => 20,
1440         minLength => 2,
1441     },
1442     macro => {
1443         description => "Use predefined standard macro.",
1444         type => 'string',
1445         optional => 1,
1446         maxLength => 128,
1447     },
1448     iface => get_standard_option('pve-iface', {
1449         description => "Network interface name. You have to use network configuration key names for VMs and containers ('net\\d+'). Host related rules can use arbitrary strings.",
1450         optional => 1
1451     }),
1452     source => {
1453         description => "Restrict packet source address. $addr_list_descr",
1454         type => 'string', format => 'pve-fw-addr-spec',
1455         optional => 1,
1456         maxLength => 512,
1457     },
1458     dest => {
1459         description => "Restrict packet destination address. $addr_list_descr",
1460         type => 'string', format => 'pve-fw-addr-spec',
1461         optional => 1,
1462         maxLength => 512,
1463     },
1464     proto => {
1465         description => "IP protocol. You can use protocol names ('tcp'/'udp') or simple numbers, as defined in '/etc/protocols'.",
1466         type => 'string', format => 'pve-fw-protocol-spec',
1467         optional => 1,
1468     },
1469     enable => {
1470         description => "Flag to enable/disable a rule.",
1471         type => 'integer',
1472         minimum => 0,
1473         optional => 1,
1474     },
1475     log => get_standard_option('pve-fw-loglevel', {
1476         description => "Log level for firewall rule.",
1477     }),
1478     sport => {
1479         description => "Restrict TCP/UDP source port. $port_descr",
1480         type => 'string', format => 'pve-fw-sport-spec',
1481         optional => 1,
1482     },
1483     dport => {
1484         description => "Restrict TCP/UDP destination port. $port_descr",
1485         type => 'string', format => 'pve-fw-dport-spec',
1486         optional => 1,
1487     },
1488     comment => {
1489         description => "Descriptive comment.",
1490         type => 'string',
1491         optional => 1,
1492     },
1493     'icmp-type' => {
1494         description => "Specify icmp-type. Only valid if proto equals 'icmp'.",
1495         type => 'string', format => 'pve-fw-icmp-type-spec',
1496         optional => 1,
1497     },
1498 };
1499
1500 sub add_rule_properties {
1501     my ($properties) = @_;
1502
1503     foreach my $k (keys %$rule_properties) {
1504         my $h = $rule_properties->{$k};
1505         # copy data, so that we can modify later without side effects
1506         foreach my $opt (keys %$h) { $properties->{$k}->{$opt} = $h->{$opt}; }
1507     }
1508
1509     return $properties;
1510 }
1511
1512 sub delete_rule_properties {
1513     my ($rule, $delete_str) = @_;
1514
1515     foreach my $opt (PVE::Tools::split_list($delete_str)) {
1516         raise_param_exc({ 'delete' => "no such property ('$opt')"})
1517             if !defined($rule_properties->{$opt});
1518         raise_param_exc({ 'delete' => "unable to delete required property '$opt'"})
1519             if $opt eq 'type' || $opt eq 'action';
1520         delete $rule->{$opt};
1521     }
1522
1523     return $rule;
1524 }
1525
1526 my $apply_macro = sub {
1527     my ($macro_name, $param, $verify, $ipversion) = @_;
1528
1529     my $macro_rules = $pve_fw_parsed_macros->{$macro_name};
1530     die "unknown macro '$macro_name'\n" if !$macro_rules; # should not happen
1531
1532     if ($ipversion && ($ipversion == 6) && $pve_ipv6fw_macros->{$macro_name}) {
1533         $macro_rules = $pve_ipv6fw_macros->{$macro_name};
1534     }
1535
1536     # skip macros which are specific to another ipversion
1537     if ($ipversion && (my $required = $pve_fw_macro_ipversion->{$macro_name})) {
1538         return if $ipversion != $required;
1539     }
1540
1541     my $rules = [];
1542
1543     foreach my $templ (@$macro_rules) {
1544         my $rule = {};
1545         my $param_used = {};
1546         foreach my $k (keys %$templ) {
1547             my $v = $templ->{$k};
1548             if ($v eq 'PARAM') {
1549                 $v = $param->{$k};
1550                 $param_used->{$k} = 1;
1551             } elsif ($v eq 'DEST') {
1552                 $v = $param->{dest};
1553                 $param_used->{dest} = 1;
1554             } elsif ($v eq 'SOURCE') {
1555                 $v = $param->{source};
1556                 $param_used->{source} = 1;
1557             }
1558
1559             if (!defined($v)) {
1560                 my $msg = "missing parameter '$k' in macro '$macro_name'";
1561                 raise_param_exc({ macro => $msg }) if $verify;
1562                 die "$msg\n";
1563             }
1564             $rule->{$k} = $v;
1565         }
1566         foreach my $k (keys %$param) {
1567             next if $k eq 'macro';
1568             next if !defined($param->{$k});
1569             next if $param_used->{$k};
1570             if (defined($rule->{$k})) {
1571                 if ($rule->{$k} ne $param->{$k}) {
1572                     my $msg = "parameter '$k' already define in macro (value = '$rule->{$k}')";
1573                     raise_param_exc({ $k => $msg }) if $verify;
1574                     die "$msg\n";
1575                 }
1576             } else {
1577                 $rule->{$k} = $param->{$k};
1578             }
1579         }
1580         push @$rules, $rule;
1581     }
1582
1583     return $rules;
1584 };
1585
1586 my $rule_env_iface_lookup = {
1587     'ct' => 1,
1588     'vm' => 1,
1589     'group' => 0,
1590     'cluster' => 1,
1591     'host' => 1,
1592 };
1593
1594 sub verify_rule {
1595     my ($rule, $cluster_conf, $fw_conf, $rule_env, $noerr) = @_;
1596
1597     my $allow_groups = $rule_env eq 'group' ? 0 : 1;
1598
1599     my $allow_iface = $rule_env_iface_lookup->{$rule_env};
1600     die "unknown rule_env '$rule_env'\n" if !defined($allow_iface); # should not happen
1601
1602     my $errors = $rule->{errors} || {};
1603
1604     my $error_count = 0;
1605
1606     my $add_error = sub {
1607         my ($param, $msg)  = @_;
1608         chomp $msg;
1609         raise_param_exc({ $param => $msg }) if !$noerr;
1610         $error_count++;
1611         $errors->{$param} = $msg if !$errors->{$param};
1612     };
1613
1614     my $ipversion;
1615     my $set_ip_version = sub {
1616         my $vers = shift;
1617         if ($vers) {
1618             die "detected mixed ipv4/ipv6 addresses in rule\n"
1619                 if $ipversion && ($vers != $ipversion);
1620             $ipversion = $vers;
1621         }
1622     };
1623
1624     my $check_ipset_or_alias_property = sub {
1625         my ($name, $expected_ipversion) = @_;
1626
1627         if (my $value = $rule->{$name}) {
1628             if ($value =~ m/^\+/) {
1629                 if ($value =~ m/^\+(${ipset_name_pattern})$/) {
1630                     &$add_error($name, "no such ipset '$1'")
1631                         if !($cluster_conf->{ipset}->{$1} || ($fw_conf && $fw_conf->{ipset}->{$1}));
1632
1633                 } else {
1634                     &$add_error($name, "invalid ipset name '$value'");
1635                 }
1636             } elsif ($value =~ m/^${ip_alias_pattern}$/){
1637                 my $alias = lc($value);
1638                 &$add_error($name, "no such alias '$value'")
1639                     if !($cluster_conf->{aliases}->{$alias} || ($fw_conf && $fw_conf->{aliases}->{$alias}));
1640                 my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
1641                 $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
1642
1643                 &$set_ip_version($e->{ipversion});
1644             }
1645         }
1646     };
1647
1648     my $type = $rule->{type};
1649     my $action = $rule->{action};
1650
1651     &$add_error('type', "missing property") if !$type;
1652     &$add_error('action', "missing property") if !$action;
1653
1654     if ($type) {
1655         if ($type eq  'in' || $type eq 'out') {
1656             &$add_error('action', "unknown action '$action'")
1657                 if $action && ($action !~ m/^(ACCEPT|DROP|REJECT)$/);
1658         } elsif ($type eq 'group') {
1659             &$add_error('type', "security groups not allowed")
1660                 if !$allow_groups;
1661             &$add_error('action', "invalid characters in security group name")
1662                 if $action && ($action !~ m/^${security_group_name_pattern}$/);
1663         } else {
1664             &$add_error('type', "unknown rule type '$type'");
1665         }
1666     }
1667
1668     if ($rule->{iface}) {
1669         &$add_error('type', "parameter -i not allowed for this rule type")
1670             if !$allow_iface;
1671         eval { PVE::JSONSchema::pve_verify_iface($rule->{iface}); };
1672         &$add_error('iface', $@) if $@;
1673         if ($rule_env eq 'vm' || $rule_env eq 'ct') {
1674             &$add_error('iface', "value does not match the regex pattern 'net\\d+'")
1675                 if $rule->{iface} !~  m/^net(\d+)$/;
1676         }
1677     }
1678
1679     if ($rule->{macro}) {
1680         if (my $preferred_name = $pve_fw_preferred_macro_names->{lc($rule->{macro})}) {
1681             $rule->{macro} = $preferred_name;
1682         } else {
1683             &$add_error('macro', "unknown macro '$rule->{macro}'");
1684         }
1685     }
1686
1687     if ($rule->{proto}) {
1688         eval { pve_fw_verify_protocol_spec($rule->{proto}); };
1689         &$add_error('proto', $@) if $@;
1690         &$set_ip_version(4) if $rule->{proto} eq 'icmp';
1691         &$set_ip_version(6) if $rule->{proto} eq 'icmpv6';
1692         &$set_ip_version(6) if $rule->{proto} eq 'ipv6-icmp';
1693     }
1694
1695     if ($rule->{dport}) {
1696         eval { parse_port_name_number_or_range($rule->{dport}, 1); };
1697         &$add_error('dport', $@) if $@;
1698         my $proto = $rule->{proto};
1699         &$add_error('proto', "missing property - 'dport' requires this property")
1700             if !$proto;
1701         &$add_error('dport', "protocol '$proto' does not support ports")
1702             if !$PROTOCOLS_WITH_PORTS->{$proto} &&
1703                 $proto ne 'icmp' && $proto ne 'icmpv6'; # special cases
1704     }
1705
1706     if (my $icmp_type = $rule ->{'icmp-type'}) {
1707         my $proto = $rule->{proto};
1708         &$add_error('proto', "missing property - 'icmp-type' requires this property")
1709             if $proto ne 'icmp' && $proto ne 'icmpv6' && $proto ne 'ipv6-icmp';
1710         &$add_error('icmp-type', "'icmp-type' cannot be specified together with 'dport'")
1711             if $rule->{dport};
1712         if ($proto eq 'icmp' && !$icmp_type_names->{$icmp_type}) {
1713             &$add_error('icmp-type', "invalid icmp-type '$icmp_type' for proto 'icmp'");
1714         } elsif (($proto eq 'icmpv6' || $proto eq 'ipv6-icmp') && !$icmpv6_type_names->{$icmp_type}) {
1715             &$add_error('icmp-type', "invalid icmp-type '$icmp_type' for proto '$proto'");
1716         }
1717     }
1718
1719     if ($rule->{sport}) {
1720         eval { parse_port_name_number_or_range($rule->{sport}, 0); };
1721         &$add_error('sport', $@) if $@;
1722         my $proto = $rule->{proto};
1723         &$add_error('proto', "missing property - 'sport' requires this property")
1724             if !$proto;
1725         &$add_error('sport', "protocol '$proto' does not support ports")
1726             if !$PROTOCOLS_WITH_PORTS->{$proto};
1727     }
1728
1729     if ($rule->{source}) {
1730         eval {
1731             my $source_ipversion = parse_address_list($rule->{source});
1732             &$set_ip_version($source_ipversion);
1733         };
1734         &$add_error('source', $@) if $@;
1735         &$check_ipset_or_alias_property('source', $ipversion);
1736     }
1737
1738     if ($rule->{dest}) {
1739         eval {
1740             my $dest_ipversion = parse_address_list($rule->{dest});
1741             &$set_ip_version($dest_ipversion);
1742         };
1743         &$add_error('dest', $@) if $@;
1744         &$check_ipset_or_alias_property('dest', $ipversion);
1745     }
1746
1747     $rule->{ipversion} = $ipversion if $ipversion;
1748
1749     if ($rule->{macro} && !$error_count) {
1750         eval { &$apply_macro($rule->{macro}, $rule, 1, $ipversion); };
1751         if (my $err = $@) {
1752             if (ref($err) eq "PVE::Exception" && $err->{errors}) {
1753                 my $eh = $err->{errors};
1754                 foreach my $p (keys %$eh) {
1755                     &$add_error($p, $eh->{$p});
1756                 }
1757             } else {
1758                 &$add_error('macro', "$err");
1759             }
1760         }
1761     }
1762
1763     $rule->{errors} = $errors if $error_count;
1764
1765     return $rule;
1766 }
1767
1768 sub copy_rule_data {
1769     my ($rule, $param) = @_;
1770
1771     foreach my $k (keys %$rule_properties) {
1772         if (defined(my $v = $param->{$k})) {
1773             if ($v eq '' || $v eq '-') {
1774                 delete $rule->{$k};
1775             } else {
1776                 $rule->{$k} = $v;
1777             }
1778         }
1779     }
1780
1781     return $rule;
1782 }
1783
1784 sub rules_modify_permissions {
1785     my ($rule_env) = @_;
1786
1787     if ($rule_env eq 'host') {
1788         return {
1789             check => ['perm', '/nodes/{node}', [ 'Sys.Modify' ]],
1790         };
1791     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1792         return {
1793             check => ['perm', '/', [ 'Sys.Modify' ]],
1794         };
1795     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1796         return {
1797             check => ['perm', '/vms/{vmid}', [ 'VM.Config.Network' ]],
1798         }
1799     }
1800
1801     return undef;
1802 }
1803
1804 sub rules_audit_permissions {
1805     my ($rule_env) = @_;
1806
1807     if ($rule_env eq 'host') {
1808         return {
1809             check => ['perm', '/nodes/{node}', [ 'Sys.Audit' ]],
1810         };
1811     } elsif ($rule_env eq 'cluster' || $rule_env eq 'group') {
1812         return {
1813             check => ['perm', '/', [ 'Sys.Audit' ]],
1814         };
1815     } elsif ($rule_env eq 'vm' || $rule_env eq 'ct') {
1816         return {
1817             check => ['perm', '/vms/{vmid}', [ 'VM.Audit' ]],
1818         }
1819     }
1820
1821     return undef;
1822 }
1823
1824 # core functions
1825
1826 sub enable_bridge_firewall {
1827
1828
1829     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-iptables", "1");
1830     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/bridge/bridge-nf-call-ip6tables", "1");
1831
1832     # make sure syncookies are enabled (which is default on newer 3.X kernels anyways)
1833     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/ipv4/tcp_syncookies", "1");
1834
1835 }
1836
1837 sub iptables_restore_cmdlist {
1838     my ($cmdlist, $table) = @_;
1839
1840     $table = 'filter' if !$table;
1841     run_command(['iptables-restore', '-T', $table, '-n'], input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1842 }
1843
1844 sub ip6tables_restore_cmdlist {
1845     my ($cmdlist, $table) = @_;
1846
1847     $table = 'filter' if !$table;
1848     run_command(['ip6tables-restore', '-T', $table, '-n'], input => $cmdlist, errmsg => "iptables_restore_cmdlist");
1849 }
1850
1851 sub ipset_restore_cmdlist {
1852     my ($cmdlist) = @_;
1853
1854     run_command(['ipset', 'restore'], input => $cmdlist, errmsg => "ipset_restore_cmdlist");
1855 }
1856
1857 sub ebtables_restore_cmdlist {
1858     my ($cmdlist) = @_;
1859
1860     run_command(['ebtables-restore'], input => $cmdlist, errmsg => "ebtables_restore_cmdlist");
1861 }
1862
1863 sub iptables_get_chains {
1864     my ($iptablescmd, $t) = @_;
1865
1866     $iptablescmd = "iptables" if !$iptablescmd;
1867     $t = 'filter' if !$t;
1868
1869     my $res = {};
1870
1871     # check what chains we want to track
1872     my $is_pvefw_chain = sub {
1873         my $name = shift;
1874
1875         return 1 if $name =~ m/^PVEFW-\S+$/;
1876
1877         return 1 if $name =~ m/^tap\d+i\d+-(?:IN|OUT)$/;
1878
1879         return 1 if $name =~ m/^veth\d+i\d+-(?:IN|OUT)$/;
1880
1881         return 1 if $name =~ m/^fwbr\d+(v\d+)?-(?:FW|IN|OUT|IPS)$/;
1882         return 1 if $name =~ m/^GROUP-(?:$security_group_name_pattern)-(?:IN|OUT)$/;
1883
1884         return undef;
1885     };
1886
1887     my $table = '';
1888
1889     my $hooks = {};
1890
1891     my $parser = sub {
1892         my $line = shift;
1893
1894         return if $line =~ m/^#/;
1895         return if $line =~ m/^\s*$/;
1896
1897         if ($line =~ m/^\*(\S+)$/) {
1898             $table = $1;
1899             return;
1900         }
1901
1902         return if $table ne $t;
1903
1904         if ($line =~ m/^:(\S+)\s/) {
1905             my $chain = $1;
1906             return if !&$is_pvefw_chain($chain);
1907             $res->{$chain} = "unknown";
1908         } elsif ($line =~ m/^-A\s+(\S+)\s.*--comment\s+\"PVESIG:(\S+)\"/) {
1909             my ($chain, $sig) = ($1, $2);
1910             return if !&$is_pvefw_chain($chain);
1911             $res->{$chain} = $sig;
1912         } elsif ($line =~ m/^-A\s+(INPUT|OUTPUT|FORWARD|PREROUTING)\s+-j\s+PVEFW-\1$/) {
1913             $hooks->{$1} = 1;
1914         } else {
1915             # simply ignore the rest
1916             return;
1917         }
1918     };
1919
1920     run_command(["$iptablescmd-save"], outfunc => $parser);
1921
1922     return wantarray ? ($res, $hooks) : $res;
1923 }
1924
1925 sub iptables_chain_digest {
1926     my ($rules) = @_;
1927     my $digest = Digest::SHA->new('sha1');
1928     foreach my $rule (@$rules) { # order is important
1929         $digest->add($rule);
1930     }
1931     return $digest->b64digest;
1932 }
1933
1934 sub ipset_chain_digest {
1935     my ($rules) = @_;
1936
1937     my $digest = Digest::SHA->new('sha1');
1938     foreach my $rule (sort @$rules) { # note: sorted
1939         $digest->add($rule);
1940     }
1941     return $digest->b64digest;
1942 }
1943
1944 sub ipset_get_chains {
1945
1946     my $res = {};
1947     my $chains = {};
1948
1949     my $parser = sub {
1950         my $line = shift;
1951
1952         return if $line =~ m/^#/;
1953         return if $line =~ m/^\s*$/;
1954         if ($line =~ m/^(?:\S+)\s(PVEFW-\S+)\s(?:\S+).*/) {
1955             my $chain = $1;
1956             # ignore initval from ipset v7.7+, won't set that yet so it'd mess up change detection
1957             $line =~ s/\binitval 0x[0-9a-f]+//;
1958             $line =~ s/\s+$//; # delete trailing white space
1959             push @{$chains->{$chain}}, $line;
1960         } else {
1961             # simply ignore the rest
1962             return;
1963         }
1964     };
1965
1966     run_command(['ipset', 'save'], outfunc => $parser);
1967
1968     # compute digest for each chain
1969     foreach my $chain (keys %$chains) {
1970         $res->{$chain} = ipset_chain_digest($chains->{$chain});
1971     }
1972
1973     return $res;
1974 }
1975
1976 sub ebtables_get_chains {
1977
1978     my $res = {};
1979     my $chains = {};
1980     my $table;
1981     my $parser = sub {
1982         my $line = shift;
1983         return if $line =~ m/^#/;
1984         return if $line =~ m/^\s*$/;
1985         if ($line =~ m/^\*(\S+)$/) {
1986             $table = $1;
1987             return;
1988         }
1989
1990         return if $table ne "filter";
1991
1992         if ($line =~ m/^:(\S+)\s(ACCEPT|DROP|RETURN)$/) {
1993             # Make sure we know chains exist even if they're empty.
1994             $chains->{$1} //= [];
1995             $res->{$1}->{policy} = $2;
1996         } elsif ($line =~ m/^(?:\S+)\s(\S+)\s(?:\S+).*/) {
1997             my $chain = $1;
1998             $line =~ s/\s+$//;
1999             push @{$chains->{$chain}}, $line;
2000         } else {
2001             # simply ignore the rest
2002             return;
2003         }
2004     };
2005
2006     run_command(['ebtables-save'], outfunc => $parser);
2007     # compute digest for each chain and store rules as well
2008     foreach my $chain (keys %$chains) {
2009         $res->{$chain}->{rules} = $chains->{$chain};
2010         $res->{$chain}->{sig} = iptables_chain_digest($chains->{$chain});
2011     }
2012     return $res;
2013 }
2014
2015 # substitute action of rule according to action hash
2016 sub rule_substitude_action {
2017     my ($rule, $actions) = @_;
2018
2019     if (my $action = $rule->{action}) {
2020         $rule->{action} = $actions->{$action} if defined($actions->{$action});
2021     }
2022 }
2023
2024 # generate a src or dst match
2025 # $dir(ection) is either d or s
2026 sub ipt_gen_src_or_dst_match {
2027     my ($adr, $dir, $ipversion, $cluster_conf, $fw_conf) = @_;
2028
2029     my $srcdst;
2030     if ($dir eq 's') {
2031         $srcdst = "src";
2032     } elsif ($dir eq 'd') {
2033         $srcdst = "dst";
2034     } else {
2035         die "ipt_gen_src_or_dst_match: invalid direction $dir \n";
2036     }
2037
2038     my $match;
2039     if ($adr =~ m/^\+/) {
2040         if ($adr =~ m/^\+(${ipset_name_pattern})$/) {
2041             my $name = $1;
2042             my $ipset_chain;
2043             if ($fw_conf && $fw_conf->{ipset}->{$name}) {
2044                 $ipset_chain = compute_ipset_chain_name($fw_conf->{vmid}, $name, $ipversion);
2045             } elsif ($cluster_conf && $cluster_conf->{ipset}->{$name}) {
2046                 $ipset_chain = compute_ipset_chain_name(0, $name, $ipversion);
2047             } else {
2048                 die "no such ipset '$name'\n";
2049             }
2050             $match = "-m set --match-set ${ipset_chain} ${srcdst}";
2051         } else {
2052             die "invalid security group name '$adr'\n";
2053         }
2054     } elsif ($adr =~ m/^${ip_alias_pattern}$/){
2055         my $alias = lc($adr);
2056         my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2057         $e = $cluster_conf->{aliases}->{$alias} if !$e && $cluster_conf;
2058         die "no such alias '$adr'\n" if !$e;
2059         $match = "-${dir} $e->{cidr}";
2060     } elsif ($adr =~ m/\-/){
2061         $match = "-m iprange --${srcdst}-range $adr";
2062     } else {
2063         $match = "-${dir} $adr";
2064     }
2065
2066     return $match;
2067 }
2068
2069 # convert a %rule to an array of iptables commands
2070 sub ipt_rule_to_cmds {
2071     my ($rule, $chain, $ipversion, $cluster_conf, $fw_conf, $vmid) = @_;
2072
2073     die "ipt_rule_to_cmds unable to handle macro" if $rule->{macro}; #should not happen
2074
2075     my @match = ();
2076
2077     if (defined $rule->{match}) {
2078         push @match, $rule->{match};
2079     } else {
2080         push @match, "-i $rule->{iface_in}" if $rule->{iface_in};
2081         push @match, "-o $rule->{iface_out}" if $rule->{iface_out};
2082
2083         if ($rule->{source}) {
2084             push @match, ipt_gen_src_or_dst_match($rule->{source}, 's', $ipversion, $cluster_conf, $fw_conf);
2085         }
2086         if ($rule->{dest}) {
2087             push @match, ipt_gen_src_or_dst_match($rule->{dest}, 'd', $ipversion, $cluster_conf, $fw_conf);
2088         }
2089
2090         if (my $proto = $rule->{proto}) {
2091             push @match, "-p $proto";
2092
2093             my $multidport = defined($rule->{dport}) && parse_port_name_number_or_range($rule->{dport}, 1);
2094             my $multisport = defined($rule->{sport}) && parse_port_name_number_or_range($rule->{sport}, 0);
2095
2096             my $add_dport = sub {
2097                 return if !defined($rule->{dport});
2098
2099                 # NOTE: we re-use dport to store --icmp-type for icmp* protocol
2100                 if ($proto eq 'icmp') {
2101                     $is_valid_icmp_type->($rule->{dport}, $icmp_type_names);
2102                     push @match, "-m icmp --icmp-type $rule->{dport}";
2103                 } elsif ($proto eq 'icmpv6') {
2104                     $is_valid_icmp_type->($rule->{dport}, $icmpv6_type_names);
2105                     push @match, "-m icmpv6 --icmpv6-type $rule->{dport}";
2106                 } elsif (!$PROTOCOLS_WITH_PORTS->{$proto}) {
2107                     die "protocol $proto does not have ports\n";
2108                 } elsif ($multidport) {
2109                     push @match, "--match multiport", "--dports $rule->{dport}";
2110                 } else {
2111                     return if !$rule->{dport};
2112                     push @match, "--dport $rule->{dport}";
2113                 }
2114             };
2115
2116             my $add_sport = sub {
2117                 return if !$rule->{sport};
2118
2119                 die "protocol $proto does not have ports\n"
2120                     if !$PROTOCOLS_WITH_PORTS->{$proto};
2121                 if ($multisport) {
2122                     push @match, "--match multiport", "--sports $rule->{sport}";
2123                 } else {
2124                     push @match, "--sport $rule->{sport}";
2125                 }
2126             };
2127
2128             my $add_icmp_type = sub {
2129                 return if !defined($rule->{'icmp-type'}) || $rule->{'icmp-type'} eq '';
2130
2131                 die "'icmp-type' can only be set if 'icmp', 'icmpv6' or 'ipv6-icmp' is specified\n"
2132                     if ($proto ne 'icmp') && ($proto ne 'icmpv6') && ($proto ne 'ipv6-icmp');
2133                 my $type = $proto eq 'icmp' ? 'icmp-type' : 'icmpv6-type';
2134
2135                 push @match, "-m $proto --$type $rule->{'icmp-type'}";
2136             };
2137
2138             # order matters - single port before multiport!
2139             $add_icmp_type->();
2140             $add_dport->() if $multisport;
2141             $add_sport->();
2142             $add_dport->() if !$multisport;
2143         } elsif ($rule->{dport} || $rule->{sport}) {
2144             die "destination port '$rule->{dport}', but no protocol specified\n" if $rule->{dport};
2145             die "source port '$rule->{sport}', but no protocol specified\n" if $rule->{sport};
2146         }
2147
2148         push @match, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
2149     }
2150     my $matchstr = scalar(@match) ? join(' ', @match) : "";
2151
2152     my $targetstr;
2153     if (defined $rule->{target}) {
2154         $targetstr = $rule->{target};
2155     } else {
2156         my $action = (defined $rule->{action}) ? $rule->{action} : "";
2157         my $goto = 1 if $action eq 'PVEFW-SET-ACCEPT-MARK';
2158         $targetstr = ($goto) ? "-g $action" : "-j $action";
2159     }
2160
2161     my @iptcmds;
2162     my $log = $rule->{log};
2163     if (defined($log) && $log ne 'nolog') {
2164         my $loglevel = $log_level_hash->{$log};
2165         my $logaction = get_log_rule_base($chain, $vmid, $rule->{logmsg}, $loglevel);
2166         push @iptcmds, "-A $chain $matchstr $logaction";
2167     }
2168     push @iptcmds, "-A $chain $matchstr $targetstr";
2169     return @iptcmds;
2170 }
2171
2172 sub ruleset_generate_rule {
2173     my ($ruleset, $chain, $ipversion, $rule, $cluster_conf, $fw_conf, $vmid) = @_;
2174
2175     my $rules;
2176
2177     if ($rule->{macro}) {
2178         $rules = &$apply_macro($rule->{macro}, $rule, 0, $ipversion);
2179     } else {
2180         $rules = [ $rule ];
2181     }
2182
2183     # update all or nothing
2184     my @ipt_rule_cmds;
2185     foreach my $r (@$rules) {
2186         push @ipt_rule_cmds, ipt_rule_to_cmds($r, $chain, $ipversion, $cluster_conf, $fw_conf, $vmid);
2187     }
2188     foreach my $c (@ipt_rule_cmds) {
2189         ruleset_add_ipt_cmd($ruleset, $chain, $c);
2190     }
2191 }
2192
2193 sub ruleset_create_chain {
2194     my ($ruleset, $chain) = @_;
2195
2196     die "Invalid chain name '$chain' (28 char max)\n" if length($chain) > 28;
2197     die "chain name may not contain collons\n" if $chain =~ m/:/; # because of log format
2198
2199     die "chain '$chain' already exists\n" if $ruleset->{$chain};
2200
2201     $ruleset->{$chain} = [];
2202 }
2203
2204 sub ruleset_chain_exist {
2205     my ($ruleset, $chain) = @_;
2206
2207     return $ruleset->{$chain} ? 1 : undef;
2208 }
2209
2210 # add an iptables command (like generated by ipt_rule_to_cmds) to a chain
2211 sub ruleset_add_ipt_cmd {
2212    my ($ruleset, $chain, $iptcmd) = @_;
2213
2214    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2215
2216    push @{$ruleset->{$chain}}, $iptcmd;
2217 }
2218
2219 sub ruleset_addrule {
2220     my ($ruleset, $chain, $match, $action, $log, $logmsg, $vmid) = @_;
2221
2222     die "no such chain '$chain'\n" if !$ruleset->{$chain};
2223
2224     if ($log) {
2225         my $loglevel = $log_level_hash->{$log};
2226         my $logaction = get_log_rule_base($chain, $vmid, $logmsg, $loglevel);
2227         push @{$ruleset->{$chain}}, "-A $chain $match $logaction";
2228     }
2229     # for stable ebtables digests avoid double-spaces to match ebtables-save output
2230     $match .= ' ' if length($match);
2231     push @{$ruleset->{$chain}}, "-A $chain ${match}$action";
2232 }
2233
2234 sub ruleset_insertrule {
2235    my ($ruleset, $chain, $match, $action, $log) = @_;
2236
2237    die "no such chain '$chain'\n" if !$ruleset->{$chain};
2238
2239    unshift @{$ruleset->{$chain}}, "-A $chain $match $action";
2240 }
2241
2242 sub get_log_rule_base {
2243     my ($chain, $vmid, $msg, $loglevel) = @_;
2244
2245     $vmid = 0 if !defined($vmid);
2246     $msg = "" if !defined($msg);
2247
2248     my $rlimit = '';
2249     if (defined($global_log_ratelimit)) {
2250         $rlimit = "-m limit $global_log_ratelimit ";
2251     }
2252
2253     # Note: we use special format for prefix to pass further
2254     # info to log daemon (VMID, LOGLEVEL and CHAIN)
2255     return "${rlimit}-j NFLOG --nflog-prefix \":$vmid:$loglevel:$chain: $msg\"";
2256 }
2257
2258 sub ruleset_add_chain_policy {
2259     my ($ruleset, $chain, $ipversion, $vmid, $policy, $loglevel, $accept_action) = @_;
2260
2261     if ($policy eq 'ACCEPT') {
2262
2263         my $rule = { action => 'ACCEPT' };
2264         rule_substitude_action($rule, { ACCEPT =>  $accept_action});
2265         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule);
2266
2267     } elsif ($policy eq 'DROP') {
2268
2269         ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Drop");
2270
2271         ruleset_addrule($ruleset, $chain, "", "-j DROP", $loglevel, "policy $policy: ", $vmid);
2272     } elsif ($policy eq 'REJECT') {
2273         ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Reject");
2274
2275         ruleset_addrule($ruleset, $chain, "", "-g PVEFW-reject", $loglevel, "policy $policy: ", $vmid);
2276     } else {
2277         # should not happen
2278         die "internal error: unknown policy '$policy'";
2279     }
2280 }
2281
2282 sub ruleset_chain_add_ndp {
2283     my ($ruleset, $chain, $ipversion, $options, $direction, $accept) = @_;
2284     return if $ipversion != 6 || (defined($options->{ndp}) && !$options->{ndp});
2285
2286     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-solicitation", $accept);
2287     if ($direction ne 'OUT' || $options->{radv}) {
2288         ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", $accept);
2289     }
2290     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-solicitation", $accept);
2291     ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-advertisement", $accept);
2292 }
2293
2294 sub ruleset_chain_add_conn_filters {
2295     my ($ruleset, $chain, $allow_invalid, $accept) = @_;
2296
2297     if (!$allow_invalid) {
2298         ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID", "-j DROP");
2299     }
2300     ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED", "-j $accept");
2301 }
2302
2303 sub ruleset_chain_add_input_filters {
2304     my ($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel) = @_;
2305
2306     if ($cluster_conf->{ipset}->{blacklist}){
2307         if (!ruleset_chain_exist($ruleset, "PVEFW-blacklist")) {
2308             ruleset_create_chain($ruleset, "PVEFW-blacklist");
2309             ruleset_addrule($ruleset, "PVEFW-blacklist", "", "-j DROP", $loglevel, "DROP: ", 0);
2310         }
2311         my $ipset_chain = compute_ipset_chain_name(0, 'blacklist', $ipversion);
2312         ruleset_addrule($ruleset, $chain, "-m set --match-set ${ipset_chain} src", "-j PVEFW-blacklist");
2313     }
2314
2315     if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
2316         if ($ipversion == 4) {
2317             ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW", "-j PVEFW-smurfs");
2318         }
2319     }
2320
2321     if ($options->{tcpflags}) {
2322         ruleset_addrule($ruleset, $chain, "-p tcp", "-j PVEFW-tcpflags");
2323     }
2324 }
2325
2326 sub ruleset_create_vm_chain {
2327     my ($ruleset, $chain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction) = @_;
2328
2329     ruleset_create_chain($ruleset, $chain);
2330     my $accept = generate_nfqueue($options);
2331
2332     if (!(defined($options->{dhcp}) && $options->{dhcp} == 0)) {
2333         if ($ipversion == 4) {
2334             if ($direction eq 'OUT') {
2335                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2336                                       { action => 'PVEFW-SET-ACCEPT-MARK',
2337                                         proto => 'udp', sport => 68, dport => 67 });
2338             } else {
2339                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2340                                       { action => 'ACCEPT',
2341                                         proto => 'udp', sport => 67, dport => 68 });
2342             }
2343         } elsif ($ipversion == 6) {
2344             if ($direction eq 'OUT') {
2345                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2346                                       { action => 'PVEFW-SET-ACCEPT-MARK',
2347                                         proto => 'udp', sport => 546, dport => 547 });
2348             } else {
2349                 ruleset_generate_rule($ruleset, $chain, $ipversion,
2350                                       { action => 'ACCEPT',
2351                                         proto => 'udp', sport => 547, dport => 546 });
2352             }
2353         }
2354
2355     }
2356
2357     if ($direction eq 'OUT') {
2358         if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
2359             ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr", "-j DROP");
2360         }
2361         if ($ipversion == 6 && !$options->{radv}) {
2362             ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", "-j DROP");
2363         }
2364         if ($ipfilter_ipset) {
2365             ruleset_addrule($ruleset, $chain, "-m set ! --match-set $ipfilter_ipset src", "-j DROP");
2366         }
2367         ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2368     }
2369
2370     my $accept_action = $direction eq 'OUT' ? '-g PVEFW-SET-ACCEPT-MARK' : "-j $accept";
2371     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, $direction, $accept_action);
2372 }
2373
2374 sub ruleset_add_group_rule {
2375     my ($ruleset, $cluster_conf, $chain, $rule, $direction, $action, $ipversion) = @_;
2376
2377     my $group = $rule->{action};
2378     my $group_chain = "GROUP-$group-$direction";
2379     if(!ruleset_chain_exist($ruleset, $group_chain)){
2380         generate_group_rules($ruleset, $cluster_conf, $group, $ipversion);
2381     }
2382
2383     if ($direction eq 'OUT' && $rule->{iface_out}) {
2384         ruleset_addrule($ruleset, $chain, "-o $rule->{iface_out}", "-j $group_chain");
2385     } elsif ($direction eq 'IN' && $rule->{iface_in}) {
2386         ruleset_addrule($ruleset, $chain, "-i $rule->{iface_in}", "-j $group_chain");
2387     } else {
2388         ruleset_addrule($ruleset, $chain, "", "-j $group_chain");
2389     }
2390
2391     ruleset_addrule($ruleset, $chain, "-m mark --mark $FWACCEPTMARK_ON", "-j $action");
2392 }
2393
2394 sub ruleset_generate_vm_rules {
2395     my ($ruleset, $rules, $cluster_conf, $vmfw_conf, $chain, $netid, $direction, $options, $ipversion, $vmid) = @_;
2396
2397     my $lc_direction = lc($direction);
2398
2399     my $in_accept = generate_nfqueue($options);
2400
2401     foreach my $rule (@$rules) {
2402         next if $rule->{iface} && $rule->{iface} ne $netid;
2403         next if !$rule->{enable} || $rule->{errors};
2404         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2405
2406         if ($rule->{type} eq 'group') {
2407             ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, $direction,
2408                                    $direction eq 'OUT' ? 'RETURN' : $in_accept, $ipversion);
2409         } else {
2410             next if $rule->{type} ne $lc_direction;
2411             eval {
2412                 $rule->{logmsg} = "$rule->{action}: ";
2413                 if ($direction eq 'OUT') {
2414                     rule_substitude_action($rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
2415                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $vmfw_conf, $vmid);
2416                 } else {
2417                     rule_substitude_action($rule, { ACCEPT => $in_accept , REJECT => "PVEFW-reject" });
2418                     ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $vmfw_conf, $vmid);
2419                 }
2420             };
2421             warn $@ if $@;
2422         }
2423     }
2424 }
2425
2426 sub generate_nfqueue {
2427     my ($options) = @_;
2428
2429     if ($options->{ips}) {
2430         my $action = "NFQUEUE";
2431         if ($options->{ips_queues} && $options->{ips_queues} =~ m/^(\d+)(:(\d+))?$/) {
2432             if (defined($3) && defined($1)) {
2433                 $action .= " --queue-balance $1:$3";
2434             } elsif (defined($1)) {
2435                 $action .= " --queue-num $1";
2436             }
2437         }
2438         $action .= " --queue-bypass" if $feature_ipset_nomatch; #need kernel 3.10
2439         return $action;
2440     } else {
2441         return "ACCEPT";
2442     }
2443 }
2444
2445 sub ruleset_generate_vm_ipsrules {
2446     my ($ruleset, $options, $direction, $iface) = @_;
2447
2448     if ($options->{ips} && $direction eq 'IN') {
2449         my $nfqueue = generate_nfqueue($options);
2450
2451         if (!ruleset_chain_exist($ruleset, "PVEFW-IPS")) {
2452             ruleset_create_chain($ruleset, "PVEFW-IPS");
2453         }
2454
2455         ruleset_addrule($ruleset, "PVEFW-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged", "-j $nfqueue");
2456     }
2457 }
2458
2459 sub generate_tap_rules_direction {
2460     my ($ruleset, $cluster_conf, $iface, $netid, $macaddr, $vmfw_conf, $vmid, $direction, $ipversion) = @_;
2461
2462     my $lc_direction = lc($direction);
2463
2464     my $rules = $vmfw_conf->{rules};
2465
2466     my $options = $vmfw_conf->{options};
2467     my $loglevel = get_option_log_level($options, "log_level_${lc_direction}");
2468
2469     my $tapchain = "$iface-$direction";
2470
2471     my $ipfilter_name = compute_ipfilter_ipset_name($netid);
2472     my $ipfilter_ipset = compute_ipset_chain_name($vmid, $ipfilter_name, $ipversion)
2473         if $options->{ipfilter} || $vmfw_conf->{ipset}->{$ipfilter_name};
2474
2475     if ($options->{enable}) {
2476         # create chain with mac and ip filter
2477         ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
2478
2479         ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $tapchain, $netid, $direction, $options, $ipversion, $vmid);
2480
2481         ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface);
2482
2483         # implement policy
2484         my $policy;
2485
2486         if ($direction eq 'OUT') {
2487             $policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
2488         } else {
2489             $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
2490         }
2491
2492         my $accept = generate_nfqueue($options);
2493         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : $accept;
2494         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, $policy, $loglevel, $accept_action);
2495     } else {
2496         my $accept_action = $direction eq 'OUT' ? "PVEFW-SET-ACCEPT-MARK" : 'ACCEPT';
2497         ruleset_add_chain_policy($ruleset, $tapchain, $ipversion, $vmid, 'ACCEPT', $loglevel, $accept_action);
2498     }
2499
2500     # plug the tap chain to bridge chain
2501     if ($direction eq 'IN') {
2502         ruleset_addrule($ruleset, "PVEFW-FWBR-IN",
2503                         "-m physdev --physdev-is-bridged --physdev-out $iface", "-j $tapchain");
2504     } else {
2505         ruleset_addrule($ruleset, "PVEFW-FWBR-OUT",
2506                         "-m physdev --physdev-is-bridged --physdev-in $iface", "-j $tapchain");
2507     }
2508 }
2509
2510 sub enable_host_firewall {
2511     my ($ruleset, $hostfw_conf, $cluster_conf, $ipversion, $corosync_conf) = @_;
2512
2513     my $options = $hostfw_conf->{options};
2514     my $cluster_options = $cluster_conf->{options};
2515     my $rules = $hostfw_conf->{rules};
2516     my $cluster_rules = $cluster_conf->{rules};
2517
2518     # corosync preparation
2519     my $corosync_rule = "-p udp --dport 5404:5405";
2520     my $corosync_local_addresses = {};
2521     my $multicast_enabled;
2522     my $local_hostname = PVE::INotify::nodename();
2523     if (defined($corosync_conf)) {
2524         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2525             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2526
2527             if ($node_name eq $local_hostname) {
2528                 $corosync_local_addresses->{$key} = $node_ip;
2529             }
2530         });
2531
2532         # allow multicast only if enabled in config
2533         my $corosync_transport = $corosync_conf->{main}->{totem}->{transport};
2534         $multicast_enabled = defined($corosync_transport) && $corosync_transport eq 'udp';
2535     }
2536
2537     # host inbound firewall
2538     my $chain = "PVEFW-HOST-IN";
2539     ruleset_create_chain($ruleset, $chain);
2540
2541     my $loglevel = get_option_log_level($options, "log_level_in");
2542
2543     ruleset_addrule($ruleset, $chain, "-i lo", "-j ACCEPT");
2544
2545     ruleset_chain_add_conn_filters($ruleset, $chain, 0, 'ACCEPT');
2546     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'IN', '-j RETURN');
2547     ruleset_chain_add_input_filters($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel);
2548
2549     # we use RETURN because we need to check also tap rules
2550     my $accept_action = 'RETURN';
2551
2552     ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
2553
2554     # add host rules first, so that cluster wide rules can be overwritten
2555     foreach my $rule (@$rules, @$cluster_rules) {
2556         next if !$rule->{enable} || $rule->{errors};
2557         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2558
2559         $rule->{iface_in} = $rule->{iface} if $rule->{iface};
2560
2561         eval {
2562             $rule->{logmsg} = "$rule->{action}: ";
2563             if ($rule->{type} eq 'group') {
2564                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'IN', $accept_action, $ipversion);
2565             } elsif ($rule->{type} eq 'in') {
2566                 rule_substitude_action($rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
2567                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $hostfw_conf, 0);
2568             }
2569         };
2570         warn $@ if $@;
2571         delete $rule->{iface_in};
2572     }
2573
2574     # allow standard traffic for management ipset (includes cluster network)
2575     my $mngmnt_ipset_chain = compute_ipset_chain_name(0, "management", $ipversion);
2576     my $mngmntsrc = "-m set --match-set ${mngmnt_ipset_chain} src";
2577     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 8006", "-j $accept_action");  # PVE API
2578     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
2579     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
2580     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 22", "-j $accept_action");  # SSH
2581     ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 60000:60050", "-j $accept_action");  # Migration
2582
2583     # corosync inbound rules
2584     if (defined($corosync_conf)) {
2585         ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action")
2586             if $multicast_enabled;
2587
2588         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2589             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2590             my $destination = $corosync_local_addresses->{$key};
2591
2592             if ($node_name ne $local_hostname && defined($destination)) {
2593                 # accept only traffic on same ring
2594                 ruleset_addrule($ruleset, $chain, "-d $destination -s $node_ip $corosync_rule", "-j $accept_action");
2595             }
2596         });
2597     }
2598
2599     # implement input policy
2600     my $policy = $cluster_options->{policy_in} || 'DROP'; # allow nothing by default
2601     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2602
2603     # host outbound firewall
2604     $chain = "PVEFW-HOST-OUT";
2605     ruleset_create_chain($ruleset, $chain);
2606
2607     $loglevel = get_option_log_level($options, "log_level_out");
2608
2609     ruleset_addrule($ruleset, $chain, "-o lo", "-j ACCEPT");
2610
2611     ruleset_chain_add_conn_filters($ruleset, $chain, 0, 'ACCEPT');
2612
2613     # we use RETURN because we may want to check other thigs later
2614     $accept_action = 'RETURN';
2615     ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'OUT', "-j $accept_action");
2616
2617     ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
2618
2619     # add host rules first, so that cluster wide rules can be overwritten
2620     foreach my $rule (@$rules, @$cluster_rules) {
2621         next if !$rule->{enable} || $rule->{errors};
2622         next if $rule->{ipversion} && ($rule->{ipversion} != $ipversion);
2623
2624         $rule->{iface_out} = $rule->{iface} if $rule->{iface};
2625         eval {
2626             $rule->{logmsg} = "$rule->{action}: ";
2627             if ($rule->{type} eq 'group') {
2628                 ruleset_add_group_rule($ruleset, $cluster_conf, $chain, $rule, 'OUT', $accept_action, $ipversion);
2629             } elsif ($rule->{type} eq 'out') {
2630                 rule_substitude_action($rule, { ACCEPT => $accept_action, REJECT => "PVEFW-reject" });
2631                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf, $hostfw_conf, 0);
2632             }
2633         };
2634         warn $@ if $@;
2635         delete $rule->{iface_out};
2636     }
2637
2638     # allow standard traffic on cluster network
2639     my $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
2640     my $localnet_ver = $cluster_conf->{aliases}->{local_network}->{ipversion};
2641
2642     if ($localnet && ($ipversion == $localnet_ver)) {
2643         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 8006", "-j $accept_action");  # PVE API
2644         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 22", "-j $accept_action");  # SSH
2645         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 5900:5999", "-j $accept_action");  # PVE VNC Console
2646         ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 3128", "-j $accept_action");  # SPICE Proxy
2647     }
2648
2649     # corosync outbound rules
2650     if (defined($corosync_conf)) {
2651         ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action")
2652             if $multicast_enabled;
2653
2654         PVE::Corosync::for_all_corosync_addresses($corosync_conf, $ipversion, sub {
2655             my ($node_name, $node_ip, $node_ipversion, $key) = @_;
2656             my $source = $corosync_local_addresses->{$key};
2657
2658             if ($node_name ne $local_hostname && defined($source)) {
2659                 # accept only traffic on same ring
2660                 ruleset_addrule($ruleset, $chain, "-s $source -d $node_ip $corosync_rule", "-j $accept_action");
2661             }
2662         });
2663     }
2664
2665     # implement output policy
2666     $policy = $cluster_options->{policy_out} || 'ACCEPT'; # allow everything by default
2667     ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
2668
2669     ruleset_addrule($ruleset, "PVEFW-OUTPUT", "", "-j PVEFW-HOST-OUT");
2670     ruleset_addrule($ruleset, "PVEFW-INPUT", "", "-j PVEFW-HOST-IN");
2671 }
2672
2673 sub generate_group_rules {
2674     my ($ruleset, $cluster_conf, $group, $ipversion) = @_;
2675
2676     my $rules = $cluster_conf->{groups}->{$group};
2677
2678     if (!$rules) {
2679         warn "no such security group '$group'\n";
2680         $rules = []; # create empty chain
2681     }
2682
2683     my $chain = "GROUP-${group}-IN";
2684
2685     ruleset_create_chain($ruleset, $chain);
2686     ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2687
2688     foreach my $rule (@$rules) {
2689         next if $rule->{type} ne 'in';
2690         next if !$rule->{enable} || $rule->{errors};
2691         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2692         rule_substitude_action($rule, { ACCEPT => "PVEFW-SET-ACCEPT-MARK", REJECT => "PVEFW-reject" });
2693         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf);
2694     }
2695
2696     $chain = "GROUP-${group}-OUT";
2697
2698     ruleset_create_chain($ruleset, $chain);
2699     ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
2700
2701     foreach my $rule (@$rules) {
2702         next if $rule->{type} ne 'out';
2703         next if !$rule->{enable} || $rule->{errors};
2704         next if $rule->{ipversion} && $rule->{ipversion} ne $ipversion;
2705         # we use PVEFW-SET-ACCEPT-MARK (Instead of ACCEPT) because we need to
2706         # check also other tap rules later
2707         rule_substitude_action($rule, { ACCEPT => 'PVEFW-SET-ACCEPT-MARK', REJECT => "PVEFW-reject" });
2708         ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, $cluster_conf);
2709     }
2710 }
2711
2712 my $MAX_NETS = 32;
2713 my $valid_netdev_names = {};
2714 for (my $i = 0; $i < $MAX_NETS; $i++)  {
2715     $valid_netdev_names->{"net$i"} = 1;
2716 }
2717
2718 sub get_mark_values {
2719     my ($value, $mask) = @_;
2720     $value = hex($value) if $value =~ /^0x/;
2721     $mask = hex($mask) if defined($mask) && $mask =~ /^0x/;
2722     $mask = 0xffffffff if !defined($mask);
2723     return ($value, $mask);
2724 }
2725
2726 sub parse_fw_rule {
2727     my ($prefix, $line, $cluster_conf, $fw_conf, $rule_env) = @_;
2728
2729     my $orig_line = $line;
2730
2731     my $rule = {};
2732
2733     # we can add single line comments to the end of the rule
2734     if ($line =~ s/#\s*(.*?)\s*$//) {
2735         $rule->{comment} = decode('utf8', $1);
2736     }
2737
2738     # we can disable a rule when prefixed with '|'
2739
2740     $rule->{enable} = $line =~ s/^\|// ? 0 : 1;
2741
2742     $line =~ s/^(\S+)\s+(\S+)\s*// ||
2743         die "unable to parse rule: $line\n";
2744
2745     $rule->{type} = lc($1);
2746     $rule->{action} = $2;
2747
2748     if ($rule->{type} eq  'in' || $rule->{type} eq 'out') {
2749         if ($rule->{action} =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) {
2750             $rule->{macro} = $1;
2751             $rule->{action} = $2;
2752         }
2753     }
2754
2755     while (length($line)) {
2756         if ($line =~ s/^-i (\S+)\s*//) {
2757             $rule->{iface} = $1;
2758             next;
2759         }
2760
2761         last if $rule->{type} eq 'group';
2762
2763         if ($line =~ s/^(?:-p|--?proto) (\S+)\s*//) {
2764             $rule->{proto} = $1;
2765             next;
2766         }
2767
2768         if ($line =~ s/^--?dport (\S+)\s*//) {
2769             $rule->{dport} = $1;
2770             next;
2771         }
2772
2773         if ($line =~ s/^--?sport (\S+)\s*//) {
2774             $rule->{sport} = $1;
2775             next;
2776         }
2777         if ($line =~ s/^--?source (\S+)\s*//) {
2778             $rule->{source} = $1;
2779             next;
2780         }
2781         if ($line =~ s/^--?dest (\S+)\s*//) {
2782             $rule->{dest} = $1;
2783             next;
2784         }
2785         if ($line =~ s/^--?log (emerg|alert|crit|err|warning|notice|info|debug|nolog)\s*//) {
2786             $rule->{log} = $1;
2787             next;
2788         }
2789         if ($line =~ s/^--?icmp-type (\S+)\s*//) {
2790             $rule->{'icmp-type'} = $1;
2791             next;
2792         }
2793
2794         last;
2795     }
2796
2797     die "unable to parse rule parameters: $line\n" if length($line);
2798
2799     $rule = verify_rule($rule, $cluster_conf, $fw_conf, $rule_env, 1);
2800     if ($rule->{errors}) {
2801         # The verbose flag really means we're running from the CLI and want
2802         # output on the console - in the other case we really want such errors
2803         # to go into the syslog instead.
2804         my $log = $verbose ? sub { warn @_ } : sub { syslog(err => @_) };
2805         $log->("$prefix - errors in rule parameters: $orig_line\n");
2806         foreach my $p (keys %{$rule->{errors}}) {
2807             $log->("  $p: $rule->{errors}->{$p}\n");
2808         }
2809     }
2810
2811     return $rule;
2812 }
2813
2814 sub verify_ethertype {
2815     my ($value) = @_;
2816     my $types = get_etc_ethertypes();
2817     die "unknown ethernet protocol type: $value\n"
2818         if !defined($types->{byname}->{$value}) &&
2819            !defined($types->{byid}->{$value});
2820 }
2821
2822 sub parse_vmfw_option {
2823     my ($line) = @_;
2824
2825     my ($opt, $value);
2826
2827     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2828
2829     if ($line =~ m/^(enable|dhcp|ndp|radv|macfilter|ipfilter|ips):\s*(0|1)\s*$/i) {
2830         $opt = lc($1);
2831         $value = int($2);
2832     } elsif ($line =~ m/^(log_level_in|log_level_out):\s*(($loglevels)\s*)?$/i) {
2833         $opt = lc($1);
2834         $value = $2 ? lc($3) : '';
2835     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2836         $opt = lc($1);
2837         $value = uc($3);
2838     } elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
2839         $opt = lc($1);
2840         $value = $2;
2841     } elsif ($line =~ m/^(layer2_protocols):\s*(((\S+)[,]?)+)\s*$/i) {
2842         $opt = lc($1);
2843         $value = $2;
2844         verify_ethertype($_) foreach split(/\s*,\s*/, $value);
2845     } else {
2846         die "can't parse option '$line'\n"
2847     }
2848
2849     return ($opt, $value);
2850 }
2851
2852 sub parse_hostfw_option {
2853     my ($line) = @_;
2854
2855     my ($opt, $value);
2856
2857     my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
2858
2859     if ($line =~ m/^(enable|nosmurfs|tcpflags|ndp|log_nf_conntrack|nf_conntrack_allow_invalid|protection_synflood):\s*(0|1)\s*$/i) {
2860         $opt = lc($1);
2861         $value = int($2);
2862     } elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
2863         $opt = lc($1);
2864         $value = $2 ? lc($3) : '';
2865     } elsif ($line =~ m/^(nf_conntrack_max|nf_conntrack_tcp_timeout_established|nf_conntrack_tcp_timeout_syn_recv|protection_synflood_rate|protection_synflood_burst|protection_limit):\s*(\d+)\s*$/i) {
2866         $opt = lc($1);
2867         $value = int($2);
2868     } else {
2869         die "can't parse option '$line'\n"
2870     }
2871
2872     return ($opt, $value);
2873 }
2874
2875 sub parse_clusterfw_option {
2876     my ($line) = @_;
2877
2878     my ($opt, $value);
2879
2880     if ($line =~ m/^(enable):\s*(\d+)\s*$/i) {
2881         $opt = lc($1);
2882         $value = int($2);
2883         if (($value > 1) && ((time() - $value) > 60)) {
2884             $value = 0
2885         }
2886     } elsif ($line =~ m/^(ebtables):\s*(0|1)\s*$/i) {
2887         $opt = lc($1);
2888         $value = int($2);
2889     } elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
2890         $opt = lc($1);
2891         $value = uc($3);
2892     } elsif ($line =~ m/^(log_ratelimit):\s*(\S+)\s*$/) {
2893         $opt = lc($1);
2894         $value = $2;
2895     } else {
2896         die "can't parse option '$line'\n"
2897     }
2898
2899     return ($opt, $value);
2900 }
2901
2902 sub resolve_alias {
2903     my ($clusterfw_conf, $fw_conf, $cidr) = @_;
2904
2905     my $alias = lc($cidr);
2906     my $e = $fw_conf ? $fw_conf->{aliases}->{$alias} : undef;
2907     $e = $clusterfw_conf->{aliases}->{$alias} if !$e && $clusterfw_conf;
2908
2909     die "no such alias '$cidr'\n" if !$e;;
2910
2911     return wantarray ? ($e->{cidr}, $e->{ipversion}) : $e->{cidr};
2912 }
2913
2914 sub parse_ip_or_cidr {
2915     my ($cidr) = @_;
2916
2917     my $ipversion;
2918
2919     if ($cidr =~ m!^(?:$IPV6RE)(/(\d+))?$!) {
2920         $cidr =~ s|/128$||;
2921         $ipversion = 6;
2922     } elsif ($cidr =~ m!^(?:$IPV4RE)(/(\d+))?$!) {
2923         $cidr =~ s|/32$||;
2924         $ipversion = 4;
2925     } else {
2926         die "value does not look like a valid IP address or CIDR network\n";
2927     }
2928
2929     return wantarray ? ($cidr, $ipversion) : $cidr;
2930 }
2931
2932 sub parse_alias {
2933     my ($line) = @_;
2934
2935     # we can add single line comments to the end of the line
2936     my $comment = decode('utf8', $1) if $line =~ s/\s*#\s*(.*?)\s*$//;
2937
2938     if ($line =~ m/^(\S+)\s(\S+)$/) {
2939         my ($name, $cidr) = ($1, $2);
2940         my $ipversion;
2941
2942         ($cidr, $ipversion) = parse_ip_or_cidr($cidr);
2943
2944         my $data = {
2945             name => $name,
2946             cidr => $cidr,
2947             ipversion => $ipversion,
2948         };
2949         $data->{comment} = $comment  if $comment;
2950         return $data;
2951     }
2952
2953     return undef;
2954 }
2955
2956 sub generic_fw_config_parser {
2957     my ($filename, $cluster_conf, $empty_conf, $rule_env) = @_;
2958
2959     my $section;
2960     my $group;
2961
2962     my $res = $empty_conf;
2963
2964     my $raw;
2965     if ($filename =~ m!^/etc/pve/(.*)$!) {
2966         $raw = PVE::Cluster::get_config($1);
2967     } else {
2968         $raw = eval { PVE::Tools::file_get_contents($filename) }; # ignore errors
2969     }
2970     return {} if !$raw;
2971
2972     my $curr_group_keys = {};
2973
2974     my $linenr = 0;
2975     while ($raw =~ /^\h*(.*?)\h*$/gm) {
2976         my $line = $1;
2977         $linenr++;
2978         next if $line =~ m/^#/;
2979         next if $line =~ m/^\s*$/;
2980         chomp $line;
2981
2982         my $prefix = "$filename (line $linenr)";
2983
2984         if ($empty_conf->{options} && ($line =~ m/^\[options\]$/i)) {
2985             $section = 'options';
2986             next;
2987         }
2988
2989         if ($empty_conf->{aliases} && ($line =~ m/^\[aliases\]$/i)) {
2990             $section = 'aliases';
2991             next;
2992         }
2993
2994         if ($empty_conf->{groups} && ($line =~ m/^\[group\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
2995             $section = 'groups';
2996             $group = lc($1);
2997             my $comment = $2;
2998             eval {
2999                 die "security group name too long\n" if length($group) > $max_group_name_length;
3000                 die "invalid security group name '$group'\n" if $group !~ m/^${security_group_name_pattern}$/;
3001             };
3002             if (my $err = $@) {
3003                 ($section, $group, $comment) = undef;
3004                 warn "$prefix: $err";
3005                 next;
3006             }
3007
3008             $res->{$section}->{$group} = [];
3009             $res->{group_comments}->{$group} =  decode('utf8', $comment)
3010                 if $comment;
3011             next;
3012         }
3013
3014         if ($empty_conf->{rules} && ($line =~ m/^\[rules\]$/i)) {
3015             $section = 'rules';
3016             next;
3017         }
3018
3019         if ($empty_conf->{ipset} && ($line =~ m/^\[ipset\s+(\S+)\]\s*(?:#\s*(.*?)\s*)?$/i)) {
3020             $section = 'ipset';
3021             $group = lc($1);
3022             my $comment = $2;
3023             eval {
3024                 die "ipset name too long\n" if length($group) > $max_ipset_name_length;
3025                 die "invalid ipset name '$group'\n" if $group !~ m/^${ipset_name_pattern}$/;
3026             };
3027             if (my $err = $@) {
3028                 ($section, $group, $comment) = undef;
3029                 warn "$prefix: $err";
3030                 next;
3031             }
3032
3033             $res->{$section}->{$group} = [];
3034             $curr_group_keys = {};
3035
3036             $res->{ipset_comments}->{$group} = decode('utf8', $comment)
3037                 if $comment;
3038             next;
3039         }
3040
3041         if (!$section) {
3042             warn "$prefix: skip line - no section\n";
3043             next;
3044         }
3045
3046         if ($section eq 'options') {
3047             eval {
3048                 my ($opt, $value);
3049                 if ($rule_env eq 'cluster') {
3050                     ($opt, $value) = parse_clusterfw_option($line);
3051                 } elsif ($rule_env eq 'host') {
3052                     ($opt, $value) = parse_hostfw_option($line);
3053                 } else {
3054                     ($opt, $value) = parse_vmfw_option($line);
3055                 }
3056                 $res->{options}->{$opt} = $value;
3057             };
3058             warn "$prefix: $@" if $@;
3059         } elsif ($section eq 'aliases') {
3060             eval {
3061                 my $data = parse_alias($line);
3062                 $res->{aliases}->{lc($data->{name})} = $data;
3063             };
3064             warn "$prefix: $@" if $@;
3065         } elsif ($section eq 'rules') {
3066             my $rule;
3067             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, $res, $rule_env); };
3068             if (my $err = $@) {
3069                 warn "$prefix: $err";
3070                 next;
3071             }
3072             push @{$res->{$section}}, $rule;
3073         } elsif ($section eq 'groups') {
3074             my $rule;
3075             eval { $rule = parse_fw_rule($prefix, $line, $cluster_conf, undef, 'group'); };
3076             if (my $err = $@) {
3077                 warn "$prefix: $err";
3078                 next;
3079             }
3080             push @{$res->{$section}->{$group}}, $rule;
3081         } elsif ($section eq 'ipset') {
3082             # we can add single line comments to the end of the rule
3083             my $comment = decode('utf8', $1) if $line =~ s/#\s*(.*?)\s*$//;
3084
3085             $line =~ m/^(\!)?\s*(\S+)\s*$/;
3086             my $nomatch = $1;
3087             my $cidr = $2;
3088             my $errors;
3089
3090             if ($nomatch && !$feature_ipset_nomatch) {
3091                 $errors->{nomatch} = "nomatch not supported by kernel";
3092             }
3093
3094             eval {
3095                 if ($cidr =~ m/^${ip_alias_pattern}$/) {
3096                     resolve_alias($cluster_conf, $res, $cidr); # make sure alias exists
3097                 } else {
3098                     $cidr = parse_ip_or_cidr($cidr);
3099                 }
3100                 die "duplicate ipset entry for '$cidr'\n"
3101                     if defined($curr_group_keys->{$cidr});
3102             };
3103             if (my $err = $@) {
3104                 chomp $err;
3105                 $errors->{cidr} = $err;
3106             }
3107
3108             if ($cidr =~ m!/0+$!) {
3109                 $errors->{cidr} = "a zero prefix is not allowed in ipset entries\n";
3110             }
3111
3112             my $entry = { cidr => $cidr };
3113             $entry->{nomatch} = 1 if $nomatch;
3114             $entry->{comment} = $comment if $comment;
3115             $entry->{errors} =  $errors if $errors;
3116
3117             if ($verbose && $errors) {
3118                 warn "$prefix - errors in ipset '$group': $line\n";
3119                 foreach my $p (keys %{$errors}) {
3120                     warn "  $p: $errors->{$p}\n";
3121                 }
3122             }
3123
3124             push @{$res->{$section}->{$group}}, $entry;
3125             $curr_group_keys->{$cidr} = 1;
3126         } else {
3127             warn "$prefix: skip line - unknown section\n";
3128             next;
3129         }
3130     }
3131
3132     return $res;
3133 }
3134
3135 # this is only used to prevent concurrent runs of rule compilation/application
3136 # see lock_*_conf for cfs locks protectiong config modification
3137 sub run_locked {
3138     my ($code, @param) = @_;
3139
3140     my $timeout = 10;
3141
3142     my $res = lock_file($pve_fw_lock_filename, $timeout, $code, @param);
3143
3144     die $@ if $@;
3145
3146     return $res;
3147 }
3148
3149 sub read_local_vm_config {
3150
3151     my $qemu = {};
3152     my $lxc = {};
3153
3154     my $vmdata = { qemu => $qemu, lxc => $lxc };
3155
3156     my $vmlist = PVE::Cluster::get_vmlist();
3157     return $vmdata if !$vmlist || !$vmlist->{ids};
3158     my $ids = $vmlist->{ids};
3159
3160     foreach my $vmid (keys %$ids) {
3161         next if !$vmid; # skip VE0
3162         my $d = $ids->{$vmid};
3163         next if !$d->{node} || $d->{node} ne $nodename;
3164         next if !$d->{type};
3165         if ($d->{type} eq 'qemu') {
3166             if ($have_qemu_server) {
3167                 my $cfspath = PVE::QemuConfig->cfs_config_path($vmid);
3168                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
3169                     $qemu->{$vmid} = $conf;
3170                 }
3171             }
3172         } elsif ($d->{type} eq 'lxc') {
3173             if ($have_lxc) {
3174                 my $cfspath = PVE::LXC::Config->cfs_config_path($vmid);
3175                 if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) {
3176                     $lxc->{$vmid} = $conf;
3177                 }
3178             }
3179         }
3180     }
3181
3182     return $vmdata;
3183 };
3184
3185 # FIXME: move use sites over to moved helper and break older packages, then remove this here
3186 sub lock_vmfw_conf {
3187     return PVE::Firewall::Helpers::lock_vmfw_conf(@_);
3188 }
3189
3190 sub load_vmfw_conf {
3191     my ($cluster_conf, $rule_env, $vmid, $dir) = @_;
3192
3193     $dir = $pvefw_conf_dir if !defined($dir);
3194     my $filename = "$dir/$vmid.fw";
3195
3196     my $empty_conf = {
3197         rules => [],
3198         options => {},
3199         aliases => {},
3200         ipset => {} ,
3201         ipset_comments => {},
3202     };
3203
3204     my $vmfw_conf = generic_fw_config_parser($filename, $cluster_conf, $empty_conf, $rule_env);
3205     $vmfw_conf->{vmid} = $vmid;
3206
3207     return $vmfw_conf;
3208 }
3209
3210 my $format_rules = sub {
3211     my ($rules, $allow_iface) = @_;
3212
3213     my $raw = '';
3214
3215     foreach my $rule (@$rules) {
3216         if ($rule->{type} eq  'in' || $rule->{type} eq 'out' || $rule->{type} eq 'group') {
3217             $raw .= '|' if defined($rule->{enable}) && !$rule->{enable};
3218             $raw .= uc($rule->{type});
3219             if ($rule->{macro}) {
3220                 $raw .= " $rule->{macro}($rule->{action})";
3221             } else {
3222                 $raw .= " " . $rule->{action};
3223             }
3224             if ($allow_iface && $rule->{iface}) {
3225                 $raw .= " -i $rule->{iface}";
3226             }
3227
3228             if ($rule->{type} ne  'group')  {
3229                 $raw .= " -source $rule->{source}" if $rule->{source};
3230                 $raw .= " -dest $rule->{dest}" if $rule->{dest};
3231                 $raw .= " -p $rule->{proto}" if $rule->{proto};
3232                 $raw .= " -dport $rule->{dport}" if $rule->{dport};
3233                 $raw .= " -sport $rule->{sport}" if $rule->{sport};
3234                 $raw .= " -log $rule->{log}" if $rule->{log};
3235                 $raw .= " -icmp-type $rule->{'icmp-type'}" if defined($rule->{'icmp-type'}) && $rule->{'icmp-type'} ne '';
3236             }
3237
3238             $raw .= " # " . encode('utf8', $rule->{comment})
3239                 if $rule->{comment} && $rule->{comment} !~ m/^\s*$/;
3240             $raw .= "\n";
3241         } else {
3242             die "unknown rule type '$rule->{type}'";
3243         }
3244     }
3245
3246     return $raw;
3247 };
3248
3249 my $format_options = sub {
3250     my ($options) = @_;
3251
3252     my $raw = '';
3253
3254     $raw .= "[OPTIONS]\n\n";
3255     foreach my $opt (keys %$options) {
3256         $raw .= "$opt: $options->{$opt}\n";
3257     }
3258     $raw .= "\n";
3259
3260     return $raw;
3261 };
3262
3263 my $format_aliases = sub {
3264     my ($aliases) = @_;
3265
3266     my $raw = '';
3267
3268     $raw .= "[ALIASES]\n\n";
3269     foreach my $k (keys %$aliases) {
3270         my $e = $aliases->{$k};
3271         $raw .= "$e->{name} $e->{cidr}";
3272         $raw .= " # " . encode('utf8', $e->{comment})
3273             if $e->{comment} && $e->{comment} !~ m/^\s*$/;
3274         $raw .= "\n";
3275     }
3276     $raw .= "\n";
3277
3278     return $raw;
3279 };
3280
3281 my $format_ipsets = sub {
3282     my ($fw_conf) = @_;
3283
3284     my $raw = '';
3285
3286     foreach my $ipset (sort keys %{$fw_conf->{ipset}}) {
3287         if (my $comment = $fw_conf->{ipset_comments}->{$ipset}) {
3288             my $utf8comment = encode('utf8', $comment);
3289             $raw .= "[IPSET $ipset] # $utf8comment\n\n";
3290         } else {
3291             $raw .= "[IPSET $ipset]\n\n";
3292         }
3293         my $options = $fw_conf->{ipset}->{$ipset};
3294
3295         my $nethash = {};
3296         foreach my $entry (@$options) {
3297             my $cidr = $entry->{cidr};
3298             if (defined($nethash->{$cidr})) {
3299                 warn "ignoring duplicate ipset entry '$cidr'\n";
3300                 next;
3301             }
3302
3303             $nethash->{$cidr} = $entry;
3304         }
3305
3306         foreach my $cidr (sort keys %$nethash) {
3307             my $entry = $nethash->{$cidr};
3308             my $line = $entry->{nomatch} ? '!' : '';
3309             $line .= $entry->{cidr};
3310             $line .= " # " . encode('utf8', $entry->{comment})
3311                 if $entry->{comment} && $entry->{comment} !~ m/^\s*$/;
3312             $raw .= "$line\n";
3313         }
3314
3315         $raw .= "\n";
3316     }
3317
3318     return $raw;
3319 };
3320
3321 sub save_vmfw_conf {
3322     my ($vmid, $vmfw_conf) = @_;
3323
3324     my $raw = '';
3325
3326     my $options = $vmfw_conf->{options};
3327     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3328
3329     my $aliases = $vmfw_conf->{aliases};
3330     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3331
3332     $raw .= &$format_ipsets($vmfw_conf) if $vmfw_conf->{ipset};
3333
3334     my $rules = $vmfw_conf->{rules} || [];
3335     if ($rules && scalar(@$rules)) {
3336         $raw .= "[RULES]\n\n";
3337         $raw .= &$format_rules($rules, 1);
3338         $raw .= "\n";
3339     }
3340
3341     my $filename = "$pvefw_conf_dir/$vmid.fw";
3342     if ($raw) {
3343         mkdir $pvefw_conf_dir;
3344         PVE::Tools::file_set_contents($filename, $raw);
3345     } else {
3346         unlink $filename;
3347     }
3348 }
3349
3350 # FIXME: remove with 8.0 and break older qemu-server/pve-container
3351 sub remove_vmfw_conf {
3352     return PVE::Firewall::Helpers::remove_vmfw_conf(@_);
3353 }
3354
3355 # FIXME: remove with 8.0 and break older qemu-server/pve-container
3356 sub clone_vmfw_conf {
3357     return PVE::Firewall::Helpers::clone_vmfw_conf(@_);
3358 }
3359
3360 sub read_vm_firewall_configs {
3361     my ($cluster_conf, $vmdata, $dir) = @_;
3362
3363     my $vmfw_configs = {};
3364
3365     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3366         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'vm', $vmid, $dir);
3367         next if !$vmfw_conf->{options}; # skip if file does not exist
3368         $vmfw_configs->{$vmid} = $vmfw_conf;
3369     }
3370     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3371         my $vmfw_conf = load_vmfw_conf($cluster_conf, 'ct', $vmid, $dir);
3372         next if !$vmfw_conf->{options}; # skip if file does not exist
3373         $vmfw_configs->{$vmid} = $vmfw_conf;
3374     }
3375
3376     return $vmfw_configs;
3377 }
3378
3379 sub get_option_log_level {
3380     my ($options, $k) = @_;
3381
3382     my $v = $options->{$k};
3383     $v = $default_log_level if !defined($v);
3384
3385     return undef if $v eq '' || $v eq 'nolog';
3386
3387     return $v if defined($log_level_hash->{$v});
3388
3389     warn "unknown log level ($k = '$v')\n";
3390
3391     return undef;
3392 }
3393
3394 sub generate_std_chains {
3395     my ($ruleset, $options, $ipversion) = @_;
3396
3397     my $std_chains = $pve_std_chains->{$ipversion} || die "internal error";
3398
3399     my $loglevel = get_option_log_level($options, 'smurf_log_level');
3400     my $chain = 'PVEFW-smurflog';
3401     if ( $std_chains->{$chain} ) {
3402         foreach my $r (@{$std_chains->{$chain}}) {
3403           $r->{log} = $loglevel;
3404         }
3405     }
3406
3407     # same as shorewall logflags action.
3408     $loglevel = get_option_log_level($options, 'tcp_flags_log_level');
3409     $chain = 'PVEFW-logflags';
3410     if ( $std_chains->{$chain} ) {
3411         foreach my $r (@{$std_chains->{$chain}}) {
3412           $r->{log} = $loglevel;
3413         }
3414     }
3415
3416     foreach my $chain (keys %$std_chains) {
3417         ruleset_create_chain($ruleset, $chain);
3418         foreach my $rule (@{$std_chains->{$chain}}) {
3419             if (ref($rule)) {
3420                 ruleset_generate_rule($ruleset, $chain, $ipversion, $rule, 0);
3421             } else {
3422                 die "rule $rule as string - should not happen";
3423             }
3424         }
3425     }
3426 }
3427
3428 sub generate_ipset_chains {
3429     my ($ipset_ruleset, $clusterfw_conf, $fw_conf, $device_ips, $ipsets) = @_;
3430
3431     foreach my $ipset (keys %{$ipsets}) {
3432
3433         my $options = $ipsets->{$ipset};
3434
3435         if ($device_ips && $ipset =~ /^ipfilter-(net\d+)$/) {
3436             if (my $ips = $device_ips->{$1}) {
3437                 $options = [@$options, @$ips];
3438             }
3439         }
3440
3441         # remove duplicates
3442         my $nethash = {};
3443         foreach my $entry (@$options) {
3444             next if $entry->{errors}; # skip entries with errors
3445             eval {
3446                 my ($cidr, $ver);
3447                 if ($entry->{cidr} =~ m/^${ip_alias_pattern}$/) {
3448                     ($cidr, $ver) = resolve_alias($clusterfw_conf, $fw_conf, $entry->{cidr});
3449                 } else {
3450                     ($cidr, $ver) = parse_ip_or_cidr($entry->{cidr});
3451                 }
3452                 #http://backreference.org/2013/03/01/ipv6-address-normalization/
3453                 if ($ver == 6) {
3454                     # ip_compress_address takes an address only, no CIDR
3455                     my ($addr, $prefix_len) = ($cidr =~ m@^([^/]*)(/.*)?$@);
3456                     $cidr = lc(Net::IP::ip_compress_address($addr, 6));
3457                     $cidr .= $prefix_len if defined($prefix_len);
3458                     $cidr =~ s|/128$||;
3459                 } else {
3460                     $cidr =~ s|/32$||;
3461                 }
3462
3463                 $nethash->{$ver}->{$cidr} = { cidr => $cidr, nomatch => $entry->{nomatch} };
3464             };
3465             warn $@ if $@;
3466         }
3467
3468         foreach my $ipversion (4, 6) {
3469             my $data = $nethash->{$ipversion};
3470
3471             my $name = compute_ipset_chain_name($fw_conf->{vmid}, $ipset, $ipversion);
3472
3473             my $hashsize = scalar(@$options);
3474             if ($hashsize <= 64) {
3475                 $hashsize = 64;
3476             } else {
3477                 $hashsize = round_powerof2($hashsize);
3478             }
3479
3480             my $bucketsize = 12; # lower than the default of 14, faster but slightly more memory use
3481
3482             my $family = $ipversion == "6" ? "inet6" : "inet";
3483
3484             $ipset_ruleset->{$name} = [
3485                 "create $name hash:net family $family hashsize $hashsize maxelem $hashsize bucketsize $bucketsize"
3486             ];
3487
3488             foreach my $cidr (sort keys %$data) {
3489                 my $entry = $data->{$cidr};
3490
3491                 my $cmd = "add $name $cidr";
3492                 if ($entry->{nomatch}) {
3493                     if ($feature_ipset_nomatch) {
3494                         push @{$ipset_ruleset->{$name}}, "$cmd nomatch";
3495                     } else {
3496                         warn "ignore !$cidr - nomatch not supported by kernel\n";
3497                     }
3498                 } else {
3499                     push @{$ipset_ruleset->{$name}}, $cmd;
3500                 }
3501             }
3502         }
3503     }
3504 }
3505
3506 sub round_powerof2 {
3507     my ($int) = @_;
3508
3509     $int--;
3510     $int |= $int >> $_ foreach (1,2,4,8,16);
3511     return ++$int;
3512 }
3513
3514 my $set_global_log_ratelimit = sub {
3515     my $cluster_opts = shift;
3516
3517     $global_log_ratelimit = '--limit 1/sec';
3518     if (defined(my $log_rlimit = $cluster_opts->{log_ratelimit})) {
3519         my $ll_format = $cluster_option_properties->{log_ratelimit}->{format};
3520         my $limit = PVE::JSONSchema::parse_property_string($ll_format, $log_rlimit);
3521
3522         if ($limit->{enable}) {
3523             if (my $rate = $limit->{rate}) {
3524                 $global_log_ratelimit = "--limit $rate";
3525             }
3526             if (my $burst = $limit->{burst}) {
3527                 $global_log_ratelimit .= " --limit-burst $burst";
3528             }
3529         } else {
3530             $global_log_ratelimit = undef;
3531         }
3532     }
3533 };
3534
3535 sub lock_clusterfw_conf {
3536     my ($timeout, $code, @param) = @_;
3537
3538     my $res = PVE::Cluster::cfs_lock_firewall("cluster", $timeout, $code, @param);
3539     die $@ if $@;
3540
3541     return $res;
3542 }
3543
3544 sub load_clusterfw_conf {
3545     my ($filename) = @_;
3546
3547     $filename = $clusterfw_conf_filename if !defined($filename);
3548     my $empty_conf = {
3549         rules => [],
3550         options => {},
3551         aliases => {},
3552         groups => {},
3553         group_comments => {},
3554         ipset => {} ,
3555         ipset_comments => {},
3556     };
3557
3558     my $cluster_conf = generic_fw_config_parser($filename, $empty_conf, $empty_conf, 'cluster');
3559     $set_global_log_ratelimit->($cluster_conf->{options});
3560
3561     return $cluster_conf;
3562 }
3563
3564 sub save_clusterfw_conf {
3565     my ($cluster_conf) = @_;
3566
3567     my $raw = '';
3568
3569     my $options = $cluster_conf->{options};
3570     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3571
3572     my $aliases = $cluster_conf->{aliases};
3573     $raw .= &$format_aliases($aliases) if $aliases && scalar(keys %$aliases);
3574
3575     $raw .= &$format_ipsets($cluster_conf) if $cluster_conf->{ipset};
3576
3577     my $rules = $cluster_conf->{rules};
3578     if ($rules && scalar(@$rules)) {
3579         $raw .= "[RULES]\n\n";
3580         $raw .= &$format_rules($rules, 1);
3581         $raw .= "\n";
3582     }
3583
3584     if ($cluster_conf->{groups}) {
3585         foreach my $group (sort keys %{$cluster_conf->{groups}}) {
3586             my $rules = $cluster_conf->{groups}->{$group};
3587             if (my $comment = $cluster_conf->{group_comments}->{$group}) {
3588                 my $utf8comment = encode('utf8', $comment);
3589                 $raw .= "[group $group] # $utf8comment\n\n";
3590             } else {
3591                 $raw .= "[group $group]\n\n";
3592             }
3593
3594             $raw .= &$format_rules($rules, 0);
3595             $raw .= "\n";
3596         }
3597     }
3598
3599     if ($raw) {
3600         mkdir $pvefw_conf_dir;
3601         PVE::Tools::file_set_contents($clusterfw_conf_filename, $raw);
3602     } else {
3603         unlink $clusterfw_conf_filename;
3604     }
3605 }
3606
3607 sub lock_hostfw_conf : prototype($$$@) {
3608     my ($node, $timeout, $code, @param) = @_;
3609
3610     $node = $nodename if !defined($node);
3611
3612     my $res = PVE::Cluster::cfs_lock_firewall("host-$node", $timeout, $code, @param);
3613     die $@ if $@;
3614
3615     return $res;
3616 }
3617
3618 sub load_hostfw_conf {
3619     my ($cluster_conf, $filename) = @_;
3620
3621     $filename = $hostfw_conf_filename if !defined($filename);
3622
3623     my $empty_conf = { rules => [], options => {}};
3624     return generic_fw_config_parser($filename, $cluster_conf, $empty_conf, 'host');
3625 }
3626
3627 sub save_hostfw_conf {
3628     my ($hostfw_conf, $filename) = @_;
3629
3630     $filename = $hostfw_conf_filename if !defined($filename);
3631
3632     my $raw = '';
3633
3634     my $options = $hostfw_conf->{options};
3635     $raw .= &$format_options($options) if $options && scalar(keys %$options);
3636
3637     my $rules = $hostfw_conf->{rules};
3638     if ($rules && scalar(@$rules)) {
3639         $raw .= "[RULES]\n\n";
3640         $raw .= &$format_rules($rules, 1);
3641         $raw .= "\n";
3642     }
3643
3644     if ($raw) {
3645         PVE::Tools::file_set_contents($filename, $raw);
3646     } else {
3647         unlink $filename;
3648     }
3649 }
3650
3651 sub compile {
3652     my ($cluster_conf, $hostfw_conf, $vmdata, $corosync_conf) = @_;
3653
3654     my $vmfw_configs;
3655
3656     # fixme: once we read standard chains from config this needs to be put in test/standard cases below
3657     $pve_std_chains = dclone($pve_std_chains_conf);
3658
3659     if ($vmdata) { # test mode
3660         my $testdir = $vmdata->{testdir} || die "no test directory specified";
3661         my $filename = "$testdir/cluster.fw";
3662         $cluster_conf = load_clusterfw_conf($filename);
3663
3664         $filename = "$testdir/host.fw";
3665         $hostfw_conf = load_hostfw_conf($cluster_conf, $filename);
3666
3667         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, $testdir);
3668     } else { # normal operation
3669         $cluster_conf = load_clusterfw_conf(undef) if !$cluster_conf;
3670
3671         $hostfw_conf = load_hostfw_conf($cluster_conf, undef) if !$hostfw_conf;
3672
3673         # cfs_update is handled by daemon or API
3674         $corosync_conf = PVE::Cluster::cfs_read_file("corosync.conf")
3675             if !defined($corosync_conf) && PVE::Corosync::check_conf_exists(1);
3676
3677         $vmdata = read_local_vm_config();
3678         $vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, undef);
3679     }
3680
3681     return ({},{},{},{}) if !$cluster_conf->{options}->{enable};
3682
3683     my $localnet;
3684     if ($cluster_conf->{aliases}->{local_network}) {
3685         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3686     } else {
3687         my $localnet_ver;
3688         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3689
3690         $cluster_conf->{aliases}->{local_network} = {
3691             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3692     }
3693
3694     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3695
3696     my $ruleset = {};
3697     my $rulesetv6 = {};
3698     $ruleset->{filter} = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 4);
3699     $ruleset->{raw} = compile_iptables_raw($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 4);
3700     $rulesetv6->{filter} = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 6);
3701     $rulesetv6->{raw} = compile_iptables_raw($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, 6);
3702     my $ebtables_ruleset = compile_ebtables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata);
3703     my $ipset_ruleset = compile_ipsets($cluster_conf, $vmfw_configs, $vmdata);
3704
3705     return ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
3706 }
3707
3708 sub compile_iptables_raw {
3709     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, $ipversion) = @_;
3710
3711     my $ruleset = {};
3712
3713     my $hostfw_options = $hostfw_conf->{options} || {};
3714     my $protection_synflood = $hostfw_options->{protection_synflood} || 0;
3715
3716     if($protection_synflood) {
3717
3718         my $protection_synflood_rate = $hostfw_options->{protection_synflood_rate} ? $hostfw_options->{protection_synflood_rate} : 200;
3719         my $protection_synflood_burst = $hostfw_options->{protection_synflood_burst} ? $hostfw_options->{protection_synflood_burst} : 1000;
3720         my $protection_synflood_limit = $hostfw_options->{protection_synflood_limit} ? $hostfw_options->{protection_synflood_limit} : 3000;
3721         my $protection_synflood_expire = $hostfw_options->{nf_conntrack_tcp_timeout_syn_recv} ? $hostfw_options->{nf_conntrack_tcp_timeout_syn_recv} : 60;
3722         $protection_synflood_expire = $protection_synflood_expire * 1000;
3723         my $protection_synflood_mask = $ipversion == 4 ? 32 : 64;
3724
3725         ruleset_create_chain($ruleset, "PVEFW-PREROUTING");
3726         ruleset_addrule($ruleset, "PVEFW-PREROUTING", "-p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m hashlimit --hashlimit-above $protection_synflood_rate/sec --hashlimit-burst $protection_synflood_burst --hashlimit-mode srcip --hashlimit-name syn --hashlimit-htable-size 2097152 --hashlimit-srcmask $protection_synflood_mask --hashlimit-htable-expire $protection_synflood_expire", "-j DROP");
3727     }
3728
3729     return $ruleset;
3730 }
3731
3732 sub compile_iptables_filter {
3733     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $corosync_conf, $ipversion) = @_;
3734
3735     my $ruleset = {};
3736
3737     ruleset_create_chain($ruleset, "PVEFW-INPUT");
3738     ruleset_create_chain($ruleset, "PVEFW-OUTPUT");
3739
3740     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3741
3742     my $hostfw_options = $hostfw_conf->{options} || {};
3743
3744     # fixme: what log level should we use here?
3745     my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
3746
3747     my $conn_allow_invalid = $hostfw_options->{nf_conntrack_allow_invalid} // 0;
3748     ruleset_chain_add_conn_filters($ruleset, "PVEFW-FORWARD", $conn_allow_invalid, "ACCEPT");
3749
3750     ruleset_create_chain($ruleset, "PVEFW-FWBR-IN");
3751     ruleset_chain_add_input_filters($ruleset, "PVEFW-FWBR-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
3752
3753     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-in fwln+", "-j PVEFW-FWBR-IN");
3754
3755     ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3756     ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-out fwln+", "-j PVEFW-FWBR-OUT");
3757
3758     generate_std_chains($ruleset, $hostfw_options, $ipversion);
3759
3760     my $hostfw_enable = !(defined($hostfw_options->{enable}) && ($hostfw_options->{enable} == 0));
3761
3762     if ($hostfw_enable) {
3763         eval { enable_host_firewall($ruleset, $hostfw_conf, $cluster_conf, $ipversion, $corosync_conf); };
3764         warn $@ if $@; # just to be sure - should not happen
3765     }
3766
3767     # generate firewall rules for QEMU VMs
3768     foreach my $vmid (sort keys %{$vmdata->{qemu}}) {
3769         eval {
3770             my $conf = $vmdata->{qemu}->{$vmid};
3771             my $vmfw_conf = $vmfw_configs->{$vmid};
3772             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3773
3774             foreach my $netid (sort keys %$conf) {
3775                 next if $netid !~ m/^net(\d+)$/;
3776                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3777                 next if !$net->{firewall};
3778
3779                 my $iface = "tap${vmid}i$1";
3780                 my $macaddr = $net->{macaddr};
3781                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3782                                              $vmfw_conf, $vmid, 'IN', $ipversion);
3783                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3784                                              $vmfw_conf, $vmid, 'OUT', $ipversion);
3785             }
3786         };
3787         warn $@ if $@; # just to be sure - should not happen
3788     }
3789
3790     # generate firewall rules for LXC containers
3791     foreach my $vmid (sort keys %{$vmdata->{lxc}}) {
3792         eval {
3793             my $conf = $vmdata->{lxc}->{$vmid};
3794             my $vmfw_conf = $vmfw_configs->{$vmid};
3795             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3796
3797             foreach my $netid (sort keys %$conf) {
3798                 next if $netid !~ m/^net(\d+)$/;
3799                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3800                 next if !$net->{firewall};
3801
3802                 my $iface = "veth${vmid}i$1";
3803                 my $macaddr = $net->{hwaddr};
3804                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3805                                              $vmfw_conf, $vmid, 'IN', $ipversion);
3806                 generate_tap_rules_direction($ruleset, $cluster_conf, $iface, $netid, $macaddr,
3807                                              $vmfw_conf, $vmid, 'OUT', $ipversion);
3808             }
3809         };
3810         warn $@ if $@; # just to be sure - should not happen
3811     }
3812
3813     if (ruleset_chain_exist($ruleset, "PVEFW-IPS")){
3814         ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED", "-j PVEFW-IPS");
3815     }
3816
3817     return $ruleset;
3818 }
3819
3820 sub mac_to_linklocal {
3821     my ($macaddr) = @_;
3822     my @parts = split(/:/, $macaddr);
3823     # The standard link local address uses the fe80::/64 prefix with the
3824     # modified EUI-64 identifier derived from the MAC address by flipping the
3825     # universal/local bit and inserting FF:FE in the middle.
3826     # See RFC 4291.
3827     $parts[0] = sprintf("%02x", hex($parts[0]) ^ 0x02);
3828     my @meui64 = (@parts[0,1,2], 'ff', 'fe', @parts[3,4,5]);
3829     return "fe80::$parts[0]$parts[1]:$parts[2]FF:FE$parts[3]:$parts[4]$parts[5]";
3830 }
3831
3832 sub compile_ipsets {
3833     my ($cluster_conf, $vmfw_configs, $vmdata) = @_;
3834
3835     my $localnet;
3836     if ($cluster_conf->{aliases}->{local_network}) {
3837         $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
3838     } else {
3839         my $localnet_ver;
3840         ($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
3841
3842         $cluster_conf->{aliases}->{local_network} = {
3843             name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
3844     }
3845
3846     push @{$cluster_conf->{ipset}->{management}}, { cidr => $localnet };
3847
3848
3849     my $ipset_ruleset = {};
3850
3851     # generate ipsets for QEMU VMs
3852     foreach my $vmid (keys %{$vmdata->{qemu}}) {
3853         eval {
3854             my $conf = $vmdata->{qemu}->{$vmid};
3855             my $vmfw_conf = $vmfw_configs->{$vmid};
3856             return if !$vmfw_conf;
3857
3858             # When the 'ipfilter' option is enabled every device for which there
3859             # is no 'ipfilter-netX' ipset defined gets an implicit empty default
3860             # ipset.
3861             # The reason is that ipfilter ipsets are always filled with standard
3862             # IPv6 link-local filters.
3863             my $ipsets = $vmfw_conf->{ipset};
3864             my $implicit_sets = {};
3865
3866             my $device_ips = {};
3867             foreach my $netid (keys %$conf) {
3868                 next if $netid !~ m/^net(\d+)$/;
3869                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3870                 next if !$net->{firewall};
3871
3872                 if ($vmfw_conf->{options}->{ipfilter} && !$ipsets->{"ipfilter-$netid"}) {
3873                     $implicit_sets->{"ipfilter-$netid"} = [];
3874                 }
3875
3876                 my $macaddr = $net->{macaddr};
3877                 my $linklocal = mac_to_linklocal($macaddr);
3878                 $device_ips->{$netid} = [
3879                     { cidr => $linklocal },
3880                     { cidr => 'fe80::/10', nomatch => 1 }
3881                 ];
3882             }
3883
3884             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $ipsets);
3885             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $implicit_sets);
3886         };
3887         warn $@ if $@; # just to be sure - should not happen
3888     }
3889
3890     # generate firewall rules for LXC containers
3891     foreach my $vmid (keys %{$vmdata->{lxc}}) {
3892         eval {
3893             my $conf = $vmdata->{lxc}->{$vmid};
3894             my $vmfw_conf = $vmfw_configs->{$vmid};
3895             return if !$vmfw_conf;
3896
3897             # When the 'ipfilter' option is enabled every device for which there
3898             # is no 'ipfilter-netX' ipset defined gets an implicit empty default
3899             # ipset.
3900             # The reason is that ipfilter ipsets are always filled with standard
3901             # IPv6 link-local filters, as well as the IP addresses configured
3902             # for the container.
3903             my $ipsets = $vmfw_conf->{ipset};
3904             my $implicit_sets = {};
3905
3906             my $device_ips = {};
3907             foreach my $netid (keys %$conf) {
3908                 next if $netid !~ m/^net(\d+)$/;
3909                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3910                 next if !$net->{firewall};
3911
3912                 if ($vmfw_conf->{options}->{ipfilter} && !$ipsets->{"ipfilter-$netid"}) {
3913                     $implicit_sets->{"ipfilter-$netid"} = [];
3914                 }
3915
3916                 my $macaddr = $net->{hwaddr};
3917                 my $linklocal = mac_to_linklocal($macaddr);
3918                 my $set = $device_ips->{$netid} = [
3919                     { cidr => $linklocal },
3920                     { cidr => 'fe80::/10', nomatch => 1 }
3921                 ];
3922                 if (defined($net->{ip}) && $net->{ip} =~ m!^($IPV4RE)(?:/\d+)?$!) {
3923                     push @$set, { cidr => $1 };
3924                 }
3925                 if (defined($net->{ip6}) && $net->{ip6} =~ m!^($IPV6RE)(?:/\d+)?$!) {
3926                     push @$set, { cidr => $1 };
3927                 }
3928             }
3929
3930             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $ipsets);
3931             generate_ipset_chains($ipset_ruleset, $cluster_conf, $vmfw_conf, $device_ips, $implicit_sets);
3932         };
3933         warn $@ if $@; # just to be sure - should not happen
3934     }
3935
3936     generate_ipset_chains($ipset_ruleset, undef, $cluster_conf, undef, $cluster_conf->{ipset});
3937
3938     return $ipset_ruleset;
3939 }
3940
3941 sub compile_ebtables_filter {
3942     my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata) = @_;
3943
3944     if (!($cluster_conf->{options}->{ebtables} // 1)) {
3945         return {};
3946     }
3947
3948     my $ruleset = {};
3949
3950     ruleset_create_chain($ruleset, "PVEFW-FORWARD");
3951
3952     ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
3953     #for ipv4 and ipv6, check macaddress in iptables, so we use conntrack 'ESTABLISHED', to speedup rules
3954     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-p IPv4', '-j ACCEPT');
3955     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-p IPv6', '-j ACCEPT');
3956     ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-o fwln+', '-j PVEFW-FWBR-OUT');
3957
3958     # generate firewall rules for QEMU VMs
3959     foreach my $vmid (sort keys %{$vmdata->{qemu}}) {
3960         eval {
3961             my $conf = $vmdata->{qemu}->{$vmid};
3962             my $vmfw_conf = $vmfw_configs->{$vmid};
3963             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3964             my $ipsets = $vmfw_conf->{ipset};
3965
3966             foreach my $netid (sort keys %$conf) {
3967                 next if $netid !~ m/^net(\d+)$/;
3968                 my $net = PVE::QemuServer::parse_net($conf->{$netid});
3969                 next if !$net->{firewall};
3970                 my $iface = "tap${vmid}i$1";
3971                 my $macaddr = $net->{macaddr};
3972                 my $arpfilter = [];
3973                 if (defined(my $ipset = $ipsets->{"ipfilter-$netid"})) {
3974                     foreach my $ipaddr (@$ipset) {
3975                         my($ip, $version) = parse_ip_or_cidr($ipaddr->{cidr});
3976                         next if !$ip || ($version && $version != 4);
3977                         push(@$arpfilter, $ip);
3978                     }
3979                 }
3980                 generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter);
3981             }
3982         };
3983         warn $@ if $@; # just to be sure - should not happen
3984     }
3985
3986     # generate firewall rules for LXC containers
3987     foreach my $vmid (sort keys %{$vmdata->{lxc}}) {
3988         eval {
3989             my $conf = $vmdata->{lxc}->{$vmid};
3990
3991             my $vmfw_conf = $vmfw_configs->{$vmid};
3992             return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
3993             my $ipsets = $vmfw_conf->{ipset};
3994
3995             foreach my $netid (sort keys %$conf) {
3996                 next if $netid !~ m/^net(\d+)$/;
3997                 my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
3998                 next if !$net->{firewall};
3999                 my $iface = "veth${vmid}i$1";
4000                 my $macaddr = $net->{hwaddr};
4001                 my $arpfilter = [];
4002                 if (defined(my $ipset = $ipsets->{"ipfilter-$netid"})) {
4003                     foreach my $ipaddr (@$ipset) {
4004                         my($ip, $version) = parse_ip_or_cidr($ipaddr->{cidr});
4005                         next if !$ip || ($version && $version != 4);
4006                         push(@$arpfilter, $ip);
4007                     }
4008                 }
4009                 if (defined(my $ip = $net->{ip}) && $vmfw_conf->{options}->{ipfilter}) {
4010                     # ebtables changes this to a .0/MASK network but we just
4011                     # want the address here, no network - see #2193
4012                     $ip =~ s|/(\d+)$||;
4013                     if ($ip ne 'dhcp') {
4014                         push @$arpfilter, $ip;
4015                     }
4016                 }
4017                 generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter);
4018             }
4019         };
4020         warn $@ if $@; # just to be sure - should not happen
4021     }
4022
4023     return $ruleset;
4024 }
4025
4026 sub generate_tap_layer2filter {
4027     my ($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter) = @_;
4028     my $options = $vmfw_conf->{options};
4029
4030     my $tapchain = $iface."-OUT";
4031
4032     # ebtables remove zeros from mac pairs
4033     $macaddr =~ s/0([0-9a-f])/$1/ig;
4034     $macaddr = lc($macaddr);
4035
4036     ruleset_create_chain($ruleset, $tapchain);
4037
4038     if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
4039         ruleset_addrule($ruleset, $tapchain, "-s ! $macaddr", '-j DROP');
4040     }
4041
4042     if (@$arpfilter){
4043         my $arpchain = $tapchain."-ARP";
4044         ruleset_addrule($ruleset, $tapchain, "-p ARP", "-j $arpchain");
4045         ruleset_create_chain($ruleset, $arpchain);
4046
4047         foreach my $ip (@{$arpfilter}) {
4048             ruleset_addrule($ruleset, $arpchain, "-p ARP --arp-ip-src $ip", '-j RETURN');
4049         }
4050         ruleset_addrule($ruleset, $arpchain, '', '-j DROP');
4051     }
4052
4053     if (defined($options->{layer2_protocols})){
4054         my $protochain = $tapchain."-PROTO";
4055         ruleset_addrule($ruleset, $tapchain, '', "-j $protochain");
4056         ruleset_create_chain($ruleset, $protochain);
4057
4058         foreach my $proto (split(/,/, $options->{layer2_protocols})) {
4059             ruleset_addrule($ruleset, $protochain, "-p $proto", '-j RETURN');
4060         }
4061         ruleset_addrule($ruleset, $protochain, '', '-j DROP');
4062     }
4063
4064     ruleset_addrule($ruleset, $tapchain, '', '-j ACCEPT');
4065
4066     ruleset_addrule($ruleset, 'PVEFW-FWBR-OUT', "-i $iface", "-j $tapchain");
4067 }
4068
4069 # the parameter $change_only_regex changes two things if defined:
4070 # * all chains not matching it will be left intact
4071 # * both the $active_chains hash and the returned status_hash have different
4072 #   structure (they contain a key named 'rules').
4073 sub get_ruleset_status {
4074     my ($ruleset, $active_chains, $digest_fn, $change_only_regex) = @_;
4075
4076     my $statushash = {};
4077
4078     foreach my $chain (sort keys %$ruleset) {
4079         my $rules = $ruleset->{$chain};
4080         my $sig = &$digest_fn($rules);
4081         my $oldsig;
4082
4083         $statushash->{$chain}->{sig} = $sig;
4084         if (defined($change_only_regex)) {
4085             $oldsig = $active_chains->{$chain}->{sig};
4086             $statushash->{$chain}->{rules} = $rules;
4087         } else {
4088             $oldsig = $active_chains->{$chain};
4089         }
4090         if (!defined($oldsig)) {
4091             $statushash->{$chain}->{action} = 'create';
4092         } else {
4093             if ($oldsig eq $sig) {
4094                 $statushash->{$chain}->{action} = 'exists';
4095             } else {
4096                 $statushash->{$chain}->{action} = 'update';
4097             }
4098         }
4099         if ($verbose) {
4100             print "$statushash->{$chain}->{action} $chain ($sig)\n";
4101             foreach my $cmd (@{$rules}) {
4102                 print "\t$cmd\n";
4103             }
4104         }
4105     }
4106
4107     foreach my $chain (sort keys %$active_chains) {
4108         next if defined($ruleset->{$chain});
4109         my $action = 'delete';
4110         my $sig = $active_chains->{$chain};
4111         if (defined($change_only_regex)) {
4112             $action = 'ignore' if ($chain !~ m/$change_only_regex/);
4113             $statushash->{$chain}->{rules} = $active_chains->{$chain}->{rules};
4114             $statushash->{$chain}->{policy} = $active_chains->{$chain}->{policy};
4115             $sig = $sig->{sig};
4116         }
4117         $statushash->{$chain}->{action} = $action;
4118         $statushash->{$chain}->{sig} = $sig;
4119         print "$action $chain ($sig)\n" if $verbose;
4120     }
4121
4122     return $statushash;
4123 }
4124
4125 sub print_sig_rule {
4126     my ($chain, $sig) = @_;
4127
4128     # We just use this to store a SHA1 checksum used to detect changes
4129     return "-A $chain -m comment --comment \"PVESIG:$sig\"\n";
4130 }
4131
4132 sub get_ruleset_cmdlist {
4133     my ($ruleset, $iptablescmd, $table) = @_;
4134
4135     $table = 'filter' if !$table;
4136
4137     my $cmdlist = "*$table\n"; # we pass this to iptables-restore;
4138
4139     my ($active_chains, $hooks) = iptables_get_chains($iptablescmd, $table);
4140     my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest);
4141
4142     # create missing chains first
4143     foreach my $chain (sort keys %$ruleset) {
4144         my $stat = $statushash->{$chain};
4145         die "internal error" if !$stat;
4146         next if $stat->{action} ne 'create';
4147
4148         $cmdlist .= ":$chain - [0:0]\n";
4149     }
4150
4151     foreach my $h (qw(INPUT OUTPUT FORWARD PREROUTING)) {
4152         my $chain = "PVEFW-$h";
4153         if ($ruleset->{$chain} && !$hooks->{$h}) {
4154             $cmdlist .= "-A $h -j $chain\n";
4155         }
4156     }
4157
4158     foreach my $chain (sort keys %$ruleset) {
4159         my $stat = $statushash->{$chain};
4160         die "internal error" if !$stat;
4161
4162         if ($stat->{action} eq 'update' || $stat->{action} eq 'create') {
4163             $cmdlist .= "-F $chain\n";
4164             foreach my $cmd (@{$ruleset->{$chain}}) {
4165                 $cmdlist .= "$cmd\n";
4166             }
4167             $cmdlist .= print_sig_rule($chain, $stat->{sig});
4168         } elsif ($stat->{action} eq 'delete') {
4169             die "internal error"; # this should not happen
4170         } elsif ($stat->{action} eq 'exists') {
4171             # do nothing
4172         } else {
4173             die "internal error - unknown status '$stat->{action}'";
4174         }
4175     }
4176
4177     foreach my $chain (keys %$statushash) {
4178         next if $statushash->{$chain}->{action} ne 'delete';
4179         $cmdlist .= "-F $chain\n";
4180     }
4181     foreach my $chain (keys %$statushash) {
4182         next if $statushash->{$chain}->{action} ne 'delete';
4183         next if $chain eq 'PVEFW-INPUT';
4184         next if $chain eq 'PVEFW-OUTPUT';
4185         next if $chain eq 'PVEFW-FORWARD';
4186         next if $chain eq 'PVEFW-PREROUTING';
4187         $cmdlist .= "-X $chain\n";
4188     }
4189
4190     my $changes = $cmdlist ne "*$table\n" ? 1 : 0;
4191
4192     $cmdlist .= "COMMIT\n";
4193
4194     return wantarray ? ($cmdlist, $changes) : $cmdlist;
4195 }
4196
4197 my $pve_ebtables_chainname_regex = qr/PVEFW-\S+|(?:tap|veth)\d+i\d+-(?:IN|OUT)/;
4198
4199 sub get_ebtables_cmdlist {
4200     my ($ruleset) = @_;
4201
4202     my $changes = 0;
4203     my $cmdlist = "*filter\n";
4204
4205     my $active_chains = ebtables_get_chains();
4206     my $statushash = get_ruleset_status($ruleset, $active_chains,
4207                                         \&iptables_chain_digest,
4208                                         $pve_ebtables_chainname_regex);
4209
4210     # create chains first and make sure PVE rules are evaluated if active
4211     my $append_pve_to_forward = '-A FORWARD -j PVEFW-FORWARD';
4212     my $pve_include = 0;
4213     foreach my $chain (sort keys %$statushash) {
4214         next if ($statushash->{$chain}->{action} eq 'delete');
4215         my $policy = $statushash->{$chain}->{policy} // 'ACCEPT';
4216         $cmdlist .= ":$chain $policy\n";
4217         $pve_include = 1 if ($chain eq 'PVEFW-FORWARD');
4218     }
4219
4220     foreach my $chain (sort keys %$statushash) {
4221         my $stat = $statushash->{$chain};
4222         $changes = 1 if ($stat->{action} !~ 'ignore|exists');
4223         next if ($stat->{action} eq 'delete');
4224
4225         foreach my $cmd (@{$statushash->{$chain}->{'rules'}}) {
4226             if ($chain eq 'FORWARD' && $cmd eq $append_pve_to_forward) {
4227                 next if ! $pve_include;
4228                 $pve_include = 0;
4229             }
4230             $cmdlist .= "$cmd\n";
4231         }
4232     }
4233     $cmdlist .= "$append_pve_to_forward\n" if $pve_include;
4234
4235     return wantarray ? ($cmdlist, $changes) : $cmdlist;
4236 }
4237
4238 sub get_ipset_cmdlist {
4239     my ($ruleset) = @_;
4240
4241     my $cmdlist = "";
4242
4243     my $delete_cmdlist = "";
4244
4245     my $active_chains = ipset_get_chains();
4246     my $statushash = get_ruleset_status($ruleset, $active_chains, \&ipset_chain_digest);
4247
4248     # remove stale _swap chains
4249     foreach my $chain (keys %$active_chains) {
4250         if ($chain =~ m/^PVEFW-\S+_swap$/) {
4251             $cmdlist .= "destroy $chain\n";
4252         }
4253     }
4254
4255     foreach my $chain (keys %$ruleset) {
4256         my $stat = $statushash->{$chain};
4257         die "internal error" if !$stat;
4258
4259         if ($stat->{action} eq 'create') {
4260             foreach my $cmd (@{$ruleset->{$chain}}) {
4261                 $cmdlist .= "$cmd\n";
4262             }
4263         }
4264     }
4265
4266     foreach my $chain (keys %$ruleset) {
4267         my $stat = $statushash->{$chain};
4268         die "internal error" if !$stat;
4269
4270         if ($stat->{action} eq 'update') {
4271             my $chain_swap = $chain."_swap";
4272
4273             foreach my $cmd (@{$ruleset->{$chain}}) {
4274                 $cmd =~ s/$chain/$chain_swap/;
4275                 $cmdlist .= "$cmd\n";
4276             }
4277             $cmdlist .= "swap $chain_swap $chain\n";
4278             $cmdlist .= "flush $chain_swap\n";
4279             $cmdlist .= "destroy $chain_swap\n";
4280         }
4281     }
4282
4283      # the remove unused chains
4284     foreach my $chain (keys %$statushash) {
4285         next if $statushash->{$chain}->{action} ne 'delete';
4286
4287         $delete_cmdlist .= "flush $chain\n";
4288         $delete_cmdlist .= "destroy $chain\n";
4289     }
4290
4291     my $changes = ($cmdlist || $delete_cmdlist) ? 1 : 0;
4292
4293     return ($cmdlist, $delete_cmdlist, $changes);
4294 }
4295
4296 sub apply_ruleset {
4297     my ($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $ebtables_ruleset) = @_;
4298
4299     enable_bridge_firewall();
4300
4301     my ($ipset_create_cmdlist, $ipset_delete_cmdlist, $ipset_changes) =
4302         get_ipset_cmdlist($ipset_ruleset);
4303
4304     my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset->{filter});
4305     my ($cmdlistv6, $changesv6) = get_ruleset_cmdlist($rulesetv6->{filter}, "ip6tables");
4306     my ($ebtables_cmdlist, $ebtables_changes) = get_ebtables_cmdlist($ebtables_ruleset);
4307     my ($cmdlist_raw, $changes_raw) = get_ruleset_cmdlist($ruleset->{raw}, undef, 'raw');
4308     my ($cmdlistv6_raw, $changesv6_raw) = get_ruleset_cmdlist($rulesetv6->{raw}, "ip6tables", 'raw');
4309
4310     if ($verbose) {
4311         if ($ipset_changes) {
4312             print "ipset changes:\n";
4313             print $ipset_create_cmdlist if $ipset_create_cmdlist;
4314             print $ipset_delete_cmdlist if $ipset_delete_cmdlist;
4315         }
4316
4317         if ($changes) {
4318             print "iptables changes:\n";
4319             print $cmdlist;
4320         }
4321
4322         if ($changesv6) {
4323             print "ip6tables changes:\n";
4324             print $cmdlistv6;
4325         }
4326
4327         if ($changes_raw) {
4328             print "iptables table raw changes:\n";
4329             print $cmdlist_raw;
4330         }
4331
4332         if ($changesv6_raw) {
4333             print "ip6tables table raw changes:\n";
4334             print $cmdlistv6_raw;
4335         }
4336
4337         if ($ebtables_changes) {
4338             print "ebtables changes:\n";
4339             print $ebtables_cmdlist;
4340         }
4341     }
4342
4343     my $tmpfile = "$pve_fw_status_dir/ipsetcmdlist1";
4344     PVE::Tools::file_set_contents($tmpfile, $ipset_create_cmdlist || '');
4345
4346     ipset_restore_cmdlist($ipset_create_cmdlist);
4347
4348     $tmpfile = "$pve_fw_status_dir/ip4cmdlist";
4349     PVE::Tools::file_set_contents($tmpfile, $cmdlist || '');
4350
4351     iptables_restore_cmdlist($cmdlist);
4352
4353     $tmpfile = "$pve_fw_status_dir/ip4cmdlistraw";
4354     PVE::Tools::file_set_contents($tmpfile, $cmdlist_raw || '');
4355
4356     iptables_restore_cmdlist($cmdlist_raw, 'raw');
4357
4358     $tmpfile = "$pve_fw_status_dir/ip6cmdlist";
4359     PVE::Tools::file_set_contents($tmpfile, $cmdlistv6 || '');
4360
4361     ip6tables_restore_cmdlist($cmdlistv6);
4362
4363     $tmpfile = "$pve_fw_status_dir/ip6cmdlistraw";
4364     PVE::Tools::file_set_contents($tmpfile, $cmdlistv6_raw || '');
4365
4366     ip6tables_restore_cmdlist($cmdlistv6_raw, 'raw');
4367
4368     $tmpfile = "$pve_fw_status_dir/ipsetcmdlist2";
4369     PVE::Tools::file_set_contents($tmpfile, $ipset_delete_cmdlist || '');
4370
4371     ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
4372
4373     ebtables_restore_cmdlist($ebtables_cmdlist);
4374
4375     $tmpfile = "$pve_fw_status_dir/ebtablescmdlist";
4376     PVE::Tools::file_set_contents($tmpfile, $ebtables_cmdlist || '');
4377
4378     # test: re-read status and check if everything is up to date
4379     my $ruleset_filter = $ruleset->{filter};
4380     my $active_chains = iptables_get_chains();
4381     my $statushash = get_ruleset_status($ruleset_filter, $active_chains, \&iptables_chain_digest);
4382
4383     my $errors;
4384     foreach my $chain (sort keys %$ruleset_filter) {
4385         my $stat = $statushash->{$chain};
4386         if ($stat->{action} ne 'exists') {
4387             warn "unable to update chain '$chain'\n";
4388             $errors = 1;
4389         }
4390     }
4391
4392     my $rulesetv6_filter = $rulesetv6->{filter};
4393     my $active_chainsv6 = iptables_get_chains("ip6tables");
4394     my $statushashv6 = get_ruleset_status($rulesetv6_filter, $active_chainsv6, \&iptables_chain_digest);
4395
4396     foreach my $chain (sort keys %$rulesetv6_filter) {
4397         my $stat = $statushashv6->{$chain};
4398         if ($stat->{action} ne 'exists') {
4399             warn "unable to update chain '$chain'\n";
4400             $errors = 1;
4401         }
4402     }
4403
4404     my $ruleset_raw = $ruleset->{raw};
4405     my $active_chains_raw = iptables_get_chains(undef, 'raw');
4406     my $statushash_raw = get_ruleset_status($ruleset_raw, $active_chains_raw, \&iptables_chain_digest);
4407
4408     foreach my $chain (sort keys %$ruleset_raw) {
4409         my $stat = $statushash_raw->{$chain};
4410         if ($stat->{action} ne 'exists') {
4411             warn "unable to update chain '$chain'\n";
4412             $errors = 1;
4413         }
4414     }
4415
4416     my $rulesetv6_raw = $rulesetv6->{raw};
4417     my $active_chainsv6_raw = iptables_get_chains("ip6tables", 'raw');
4418     my $statushashv6_raw = get_ruleset_status($rulesetv6_raw, $active_chainsv6_raw, \&iptables_chain_digest);
4419
4420     foreach my $chain (sort keys %$rulesetv6_raw) {
4421         my $stat = $statushashv6_raw->{$chain};
4422         if ($stat->{action} ne 'exists') {
4423             warn "unable to update chain '$chain'\n";
4424             $errors = 1;
4425         }
4426     }
4427
4428     my $active_ebtables_chains = ebtables_get_chains();
4429     my $ebtables_statushash = get_ruleset_status($ebtables_ruleset,
4430                                 $active_ebtables_chains, \&iptables_chain_digest,
4431                                 $pve_ebtables_chainname_regex);
4432
4433     foreach my $chain (sort keys %$ebtables_ruleset) {
4434         my $stat = $ebtables_statushash->{$chain};
4435         if ($stat->{action} ne 'exists') {
4436             warn "ebtables : unable to update chain '$chain'\n";
4437             $errors = 1;
4438         }
4439     }
4440
4441     die "unable to apply firewall changes\n" if $errors;
4442
4443     update_nf_conntrack_max($hostfw_conf);
4444
4445     update_nf_conntrack_tcp_timeout_established($hostfw_conf);
4446
4447     update_nf_conntrack_tcp_timeout_syn_recv($hostfw_conf);
4448
4449     update_nf_conntrack_logging($hostfw_conf);
4450 }
4451
4452 sub update_nf_conntrack_max {
4453     my ($hostfw_conf) = @_;
4454
4455     my $max = 262144; # reasonable default (2^16 * 4), see nf_conntrack-sysctl docs
4456
4457     my $options = $hostfw_conf->{options} || {};
4458
4459     if (defined($options->{nf_conntrack_max}) && ($options->{nf_conntrack_max} > $max)) {
4460         $max = $options->{nf_conntrack_max};
4461         $max = int(($max+ 8191)/8192)*8192; # round to multiples of 8192
4462     }
4463
4464     my $filename_nf_conntrack_max = "/proc/sys/net/nf_conntrack_max";
4465     my $filename_hashsize = "/sys/module/nf_conntrack/parameters/hashsize";
4466
4467     my $current = int(PVE::Tools::file_read_firstline($filename_nf_conntrack_max) || $max);
4468
4469     if ($current != $max) {
4470         my $hashsize = int($max/4);
4471         PVE::ProcFSTools::write_proc_entry($filename_hashsize, $hashsize);
4472         PVE::ProcFSTools::write_proc_entry($filename_nf_conntrack_max, $max);
4473     }
4474 }
4475
4476 sub update_nf_conntrack_tcp_timeout_established {
4477     my ($hostfw_conf) = @_;
4478
4479     my $options = $hostfw_conf->{options} || {};
4480
4481     my $value = defined($options->{nf_conntrack_tcp_timeout_established}) ? $options->{nf_conntrack_tcp_timeout_established} : 432000;
4482
4483     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established", $value);
4484 }
4485
4486 sub update_nf_conntrack_tcp_timeout_syn_recv {
4487     my ($hostfw_conf) = @_;
4488
4489     my $options = $hostfw_conf->{options} || {};
4490
4491     my $value = defined($options->{nf_conntrack_tcp_timeout_syn_recv}) ? $options->{nf_conntrack_tcp_timeout_syn_recev} : 60;
4492
4493     PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_syn_recv", $value);
4494 }
4495
4496 my $log_nf_conntrack_enabled = undef;
4497 sub update_nf_conntrack_logging {
4498     my ($hostfw_conf) = @_;
4499
4500     my $options = $hostfw_conf->{options} || {};
4501     my $value = $options->{log_nf_conntrack} || 0;
4502     if (!defined($log_nf_conntrack_enabled)
4503         || $value != $log_nf_conntrack_enabled)
4504     {
4505         my $tmpfile = "$pve_fw_status_dir/log_nf_conntrack";
4506         PVE::Tools::file_set_contents($tmpfile, $value);
4507
4508         run_command([qw(systemctl try-reload-or-restart pvefw-logger.service)]);
4509         $log_nf_conntrack_enabled = $value;
4510     }
4511 }
4512
4513 sub remove_pvefw_chains {
4514
4515     PVE::Firewall::remove_pvefw_chains_iptables("iptables");
4516     PVE::Firewall::remove_pvefw_chains_iptables("ip6tables");
4517     PVE::Firewall::remove_pvefw_chains_iptables("iptables", "raw");
4518     PVE::Firewall::remove_pvefw_chains_iptables("ip6tables", "raw");
4519     PVE::Firewall::remove_pvefw_chains_ipset();
4520     PVE::Firewall::remove_pvefw_chains_ebtables();
4521
4522 }
4523
4524 sub remove_pvefw_chains_iptables {
4525     my ($iptablescmd, $table) = @_;
4526
4527     $table = 'filter' if !$table;
4528
4529     my ($chash, $hooks) = iptables_get_chains($iptablescmd, $table);
4530     my $cmdlist = "*$table\n";
4531
4532     foreach my $h (qw(INPUT OUTPUT FORWARD PREROUTING)) {
4533         if ($hooks->{$h}) {
4534             $cmdlist .= "-D $h -j PVEFW-$h\n";
4535         }
4536     }
4537
4538     foreach my $chain (keys %$chash) {
4539         $cmdlist .= "-F $chain\n";
4540     }
4541
4542     foreach my $chain (keys %$chash) {
4543         $cmdlist .= "-X $chain\n";
4544     }
4545     $cmdlist .= "COMMIT\n";
4546
4547     if($iptablescmd eq "ip6tables") {
4548         ip6tables_restore_cmdlist($cmdlist, $table);
4549     } else {
4550         iptables_restore_cmdlist($cmdlist, $table);
4551     }
4552 }
4553
4554 sub remove_pvefw_chains_ipset {
4555
4556     my $ipset_chains = ipset_get_chains();
4557
4558     my $cmdlist = "";
4559
4560     foreach my $chain (keys %$ipset_chains) {
4561         $cmdlist .= "flush $chain\n";
4562         $cmdlist .= "destroy $chain\n";
4563     }
4564
4565     ipset_restore_cmdlist($cmdlist) if $cmdlist;
4566 }
4567
4568 sub remove_pvefw_chains_ebtables {
4569     # apply empty ruleset = remove all our chains
4570     ebtables_restore_cmdlist(get_ebtables_cmdlist({}));
4571 }
4572
4573 sub init {
4574     my $cluster_conf = load_clusterfw_conf();
4575     my $cluster_options = $cluster_conf->{options};
4576     my $enable = $cluster_options->{enable};
4577
4578     return if !$enable;
4579
4580     # load required modules here
4581 }
4582
4583 sub update {
4584     my $code = sub {
4585
4586         my $cluster_conf = load_clusterfw_conf();
4587         my $cluster_options = $cluster_conf->{options};
4588
4589         if (!$cluster_options->{enable}) {
4590             PVE::Firewall::remove_pvefw_chains();
4591             return;
4592         }
4593
4594         my $hostfw_conf = load_hostfw_conf($cluster_conf);
4595
4596         my ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset) = compile($cluster_conf, $hostfw_conf);
4597
4598         apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
4599     };
4600
4601     run_locked($code);
4602 }
4603
4604 1;