gosa-si/modules/ArpHandler.pm

   1 package ArpHandler;
   2
   3 use Exporter;
   4 @ISA = ("Exporter");
   5
   6 use strict;
   7 use warnings;
   8 use GOSA::GosaSupportDaemon;
   9 use POSIX;
  10 use Fcntl;
  11 use Net::LDAP;
  12 use Net::LDAP::LDIF;
  13 use Net::LDAP::Entry;
  14 use Net::DNS;
  15 use Switch;
  16 use Data::Dumper;
  17
  18 # Don't start if some of the modules are missing
  19 my $start_service=1;
  20 my $lookup_vendor=1;
  21 BEGIN{
  22         unless(eval('use Socket qw(PF_INET SOCK_DGRAM inet_ntoa sockaddr_in)')) {
  23                 $start_service=0;
  24         }
  25         unless(eval('use POE qw(Component::Pcap Component::ArpWatch)')) {
  26                 $start_service=0;
  27         }
  28         unless(eval('use Net::MAC::Vendor')) {
  29                 $lookup_vendor=0;
  30         }
  31 }
  32
  33 END{}
  34
  35 my ($timeout, $mailto, $mailfrom, $user, $group);
  36 my ($arp_activ, $arp_interface, $ldap_uri, $ldap_base, $ldap_admin_dn, $ldap_admin_password);
  37 my $hosts_database={};
  38 my $resolver=Net::DNS::Resolver->new;
  39 my $ldap;
  40 if($lookup_vendor) {
  41         eval("Net::MAC::Vendor::load_cache('file:///usr/lib/gosa-si/modules/oui.txt')");
  42         if($@) {
  43                 &main::daemon_log("Loading OUI cache file failed! MAC Vendor lookup disabled", 1);
  44                 $lookup_vendor=0;
  45         } else {
  46                 &main::daemon_log("Loading OUI cache file suceeded!", 6);
  47         }
  48 }
  49
  50 my %cfg_defaults =
  51 (
  52         "ArpHandler" => {
  53                 "activ"           => [\$arp_activ,         "on"],
  54                 "interface"       => [\$arp_interface,    "all"],
  55         },
  56         "server" => {
  57                 "ldap-uri"            => [\$ldap_uri,            ""],
  58                 "ldap-base"           => [\$ldap_base,           ""],
  59                 "ldap-admin-dn"       => [\$ldap_admin_dn,       ""],
  60                 "ldap-admin-password" => [\$ldap_admin_password, ""],
  61         },
  62 );
  63
  64 #===  FUNCTION  ================================================================
  65 #         NAME:  read_configfile
  66 #   PARAMETERS:  cfg_file - string -
  67 #      RETURNS:  nothing
  68 #  DESCRIPTION:  read cfg_file and set variables
  69 #===============================================================================
  70 sub read_configfile {
  71         my $cfg;
  72         if( defined( $main::cfg_file) && ( length($main::cfg_file) > 0 )) {
  73                 if( -r $main::cfg_file ) {
  74                         $cfg = Config::IniFiles->new( -file => $main::cfg_file );
  75                 } else {
  76                         print STDERR "Couldn't read config file!";
  77                 }
  78         } else {
  79                 $cfg = Config::IniFiles->new() ;
  80         }
  81         foreach my $section (keys %cfg_defaults) {
  82                 foreach my $param (keys %{$cfg_defaults{ $section }}) {
  83                         my $pinfo = $cfg_defaults{ $section }{ $param };
  84                         ${@$pinfo[0]} = $cfg->val( $section, $param, @$pinfo[1] );
  85                 }
  86         }
  87 }
  88
  89 sub get_module_info {
  90         my @info = (undef,
  91                 undef,
  92         );
  93
  94         &read_configfile();
  95         # Don't start if some of the modules are missing
  96         if(($arp_activ eq 'on') && $start_service) {
  97                 $ldap = Net::LDAP->new($ldap_uri);
  98                 if (!$ldap) {
  99                         &main::daemon_log("Could not connect to LDAP Server at $ldap_uri!\n$@", 1);
 100                 } else {
 101                         $ldap->bind($ldap_admin_dn, password => $ldap_admin_password);
 102                 }
 103
 104                 # When interface is not configured (or 'all'), start arpwatch on all possible interfaces
 105                 if ((!defined($arp_interface)) || $arp_interface eq 'all') {
 106                         foreach my $device(&get_interfaces) {
 107                                 # TODO: Need a better workaround for IPv4-to-IPv6 bridges
 108                                 if($device =~ m/^sit\d+$/) {
 109                                         next;
 110                                 }
 111
 112                                 # If device has a valid mac address
 113                                 # TODO: Check if this should be the right way
 114                                 if(not(&get_mac($device) eq "00:00:00:00:00:00")) {
 115                                         &main::daemon_log("Starting ArpWatch on $device", 1);
 116                                         POE::Session->create(
 117                                                 inline_states => {
 118                                                         _start => sub {
 119                                                                 &start(@_,$device);
 120                                                         },
 121                                                         _stop => sub {
 122                                                                 $ldap->unbind if (defined($ldap));
 123                                                                 $ldap->disconnect if (defined($ldap));
 124                                                                 $_[KERNEL]->post( sprintf("arp_watch_$device") => 'shutdown' )
 125                                                         },
 126                                                         got_packet => \&got_packet,
 127                                                 },
 128                                         );
 129                                 }
 130                         }
 131                 } else {
 132                         foreach my $device(split(/[\s,]+/, $arp_interface)) {
 133                                 &main::daemon_log("Starting ArpWatch on $device", 1);
 134                                 POE::Session->create(
 135                                         inline_states => {
 136                                                 _start => sub {
 137                                                         &start(@_,$device);
 138                                                 },
 139                                                 _stop => sub {
 140                                                         $ldap->unbind if (defined($ldap));
 141                                                         $ldap->disconnect if (defined($ldap));
 142                                                         $_[KERNEL]->post( sprintf("arp_watch_$device") => 'shutdown' )
 143                                                 },
 144                                                 got_packet => \&got_packet,
 145                                         },
 146                                 );
 147                         }
 148                 }
 149         } else {
 150                 &main::daemon_log("ArpHandler disabled. Not starting any capture processes");
 151         }
 152         return \@info;
 153 }
 154
 155 sub process_incoming_msg {
 156         return 1;
 157 }
 158
 159 sub start {
 160         my $device = (exists($_[ARG0])?$_[ARG0]:'eth0');
 161         POE::Component::ArpWatch->spawn(
 162                 Alias => sprintf("arp_watch_$device"),
 163                 Device => $device,
 164                 Dispatch => 'got_packet',
 165                 Session => $_[SESSION],
 166         );
 167
 168         $_[KERNEL]->post( sprintf("arp_watch_$device") => 'run' );
 169 }
 170
 171 sub got_packet {
 172         my ($kernel, $heap, $sender, $packet) = @_[KERNEL, HEAP, SENDER, ARG0];
 173
 174         if(     $packet->{source_haddr} eq "00:00:00:00:00:00" ||
 175                 $packet->{source_haddr} eq "ff:ff:ff:ff:ff:ff" ||
 176                 $packet->{source_ipaddr} eq "0.0.0.0") {
 177                 return;
 178         }
 179
 180         my $capture_device = sprintf "%s", $kernel->alias_list($sender) =~ /^arp_watch_(.*)$/;
 181
 182         if(!exists($hosts_database->{$packet->{source_haddr}})) {
 183                 my $dnsresult= $resolver->search($packet->{source_ipaddr});
 184                 my $dnsname= (defined($dnsresult))?$dnsresult->{answer}[0]->{ptrdname}:$packet->{source_ipaddr};
 185                 my $ldap_result=&get_host_from_ldap($packet->{source_haddr});
 186                 if(exists($ldap_result->{dn})) {
 187                         $hosts_database->{$packet->{source_haddr}}=$ldap_result;
 188                         $hosts_database->{$packet->{source_haddr}}->{dnsname}= $dnsname;
 189                         if(!exists($ldap_result->{ipHostNumber})) {
 190                                 $hosts_database->{$packet->{source_haddr}}->{ipHostNumber}=$packet->{source_ipaddr};
 191                         } else {
 192                                 if(!($ldap_result->{ipHostNumber} eq $packet->{source_ipaddr})) {
 193                                         &main::daemon_log(
 194                                                 "Current IP Address ".$packet->{source_ipaddr}.
 195                                                 " of host ".$hosts_database->{$packet->{source_haddr}}->{dnsname}.
 196                                                 " differs from LDAP (".$ldap_result->{ipHostNumber}.")", 4);
 197                                 }
 198                         }
 199                         $hosts_database->{$packet->{source_haddr}}->{dnsname}=$dnsname;
 200                         &main::daemon_log("Host was found in LDAP as ".$ldap_result->{dn}, 8);
 201                 } else {
 202                         $hosts_database->{$packet->{source_haddr}}={
 203                                 macAddress => $packet->{source_haddr},
 204                                 ipHostNumber => $packet->{source_ipaddr},
 205                                 dnsname => $dnsname,
 206                                 cn => (($dnsname =~ /^(\d){1,3}\.(\d){1,3}\.(\d){1,3}\.(\d){1,3}/) ? $dnsname : sprintf "%s", $dnsname =~ /([^\.]+)\./),
 207                                 macVendor => (($lookup_vendor) ? &get_vendor_for_mac($packet->{source_haddr}) : "Unknown Vendor"),
 208                         };
 209                         &main::daemon_log("Host was not found in LDAP (".($hosts_database->{$packet->{source_haddr}}->{dnsname}).")",6);
 210                         &main::daemon_log(
 211                                 "New Host ".($hosts_database->{$packet->{source_haddr}}->{dnsname}).
 212                                 ": ".$hosts_database->{$packet->{source_haddr}}->{ipHostNumber}.
 213                                 "/".$hosts_database->{$packet->{source_haddr}}->{macAddress},4);
 214                         &add_ldap_entry(
 215                                 $ldap,
 216                                 $ldap_base,
 217                                 $hosts_database->{$packet->{source_haddr}}->{macAddress},
 218                                 'new-system',
 219                                 $hosts_database->{$packet->{source_haddr}}->{ipHostNumber},
 220                                 'interface',
 221                                 $hosts_database->{$packet->{source_haddr}}->{macVendor});
 222                 }
 223                 $hosts_database->{$packet->{source_haddr}}->{device}= $capture_device;
 224         } else {
 225                 if(!($hosts_database->{$packet->{source_haddr}}->{ipHostNumber} eq $packet->{source_ipaddr})) {
 226                         &main::daemon_log(
 227                                 "IP Address change of MAC ".$packet->{source_haddr}.
 228                                 ": ".$hosts_database->{$packet->{source_haddr}}->{ipHostNumber}.
 229                                 "->".$packet->{source_ipaddr}, 4);
 230                         $hosts_database->{$packet->{source_haddr}}->{ipHostNumber}= $packet->{source_ipaddr};
 231                         &change_ldap_entry(
 232                                 $ldap,
 233                                 $ldap_base,
 234                                 $hosts_database->{$packet->{source_haddr}}->{macAddress},
 235                                 'ip-changed',
 236                                 $hosts_database->{$packet->{source_haddr}}->{ipHostNumber},
 237                         );
 238
 239                 }
 240                 &main::daemon_log("Host already in cache (".($hosts_database->{$packet->{source_haddr}}->{device})."->".($hosts_database->{$packet->{source_haddr}}->{dnsname}).")",8);
 241         }
 242 }
 243
 244 sub get_host_from_ldap {
 245         my $mac=shift;
 246         my $result={};
 247
 248         my $ldap_result= &search_ldap_entry(
 249                 $ldap,
 250                 $ldap_base,
 251                 "(|(macAddress=$mac)(dhcpHWAddress=ethernet $mac))"
 252         );
 253
 254         if(defined($ldap_result) && $ldap_result->count==1) {
 255                 if(exists($ldap_result->{entries}[0]) &&
 256                         exists($ldap_result->{entries}[0]->{asn}->{objectName}) &&
 257                         exists($ldap_result->{entries}[0]->{asn}->{attributes})) {
 258
 259                         for my $attribute(@{$ldap_result->{entries}[0]->{asn}->{attributes}}) {
 260                                 if($attribute->{type} eq 'cn') {
 261                                         $result->{cn} = $attribute->{vals}[0];
 262                                 }
 263                                 if($attribute->{type} eq 'macAddress') {
 264                                         $result->{macAddress} = $attribute->{vals}[0];
 265                                 }
 266                                 if($attribute->{type} eq 'dhcpHWAddress') {
 267                                         $result->{dhcpHWAddress} = $attribute->{vals}[0];
 268                                 }
 269                                 if($attribute->{type} eq 'ipHostNumber') {
 270                                         $result->{ipHostNumber} = $attribute->{vals}[0];
 271                                 }
 272                         }
 273                 }
 274                 $result->{dn} = $ldap_result->{entries}[0]->{asn}->{objectName};
 275         }
 276
 277         return $result;
 278 }
 279
 280 #===  FUNCTION  ================================================================
 281 #         NAME:  get_interfaces
 282 #   PARAMETERS:  none
 283 #      RETURNS:  (list of interfaces)
 284 #  DESCRIPTION:  Uses proc fs (/proc/net/dev) to get list of interfaces.
 285 #===============================================================================
 286 sub get_interfaces {
 287         my @result;
 288         my $PROC_NET_DEV= ('/proc/net/dev');
 289
 290         open(PROC_NET_DEV, "<$PROC_NET_DEV")
 291                 or die "Could not open $PROC_NET_DEV";
 292
 293         my @ifs = <PROC_NET_DEV>;
 294
 295         close(PROC_NET_DEV);
 296
 297         # Eat first two line
 298         shift @ifs;
 299         shift @ifs;
 300
 301         chomp @ifs;
 302         foreach my $line(@ifs) {
 303                 my $if= (split /:/, $line)[0];
 304                 $if =~ s/^\s+//;
 305                 push @result, $if;
 306         }
 307
 308         return @result;
 309 }
 310
 311 #===  FUNCTION  ================================================================
 312 #         NAME:  get_mac
 313 #   PARAMETERS:  interface name (i.e. eth0)
 314 #      RETURNS:  (mac address)
 315 #  DESCRIPTION:  Uses ioctl to get mac address directly from system.
 316 #===============================================================================
 317 sub get_mac {
 318         my $ifreq= shift;
 319         my $result;
 320         if ($ifreq && length($ifreq) > 0) {
 321                 if($ifreq eq "all") {
 322                         $result = "00:00:00:00:00:00";
 323                 } else {
 324                         my $SIOCGIFHWADDR= 0x8927;     # man 2 ioctl_list
 325
 326                         socket SOCKET, PF_INET, SOCK_DGRAM, getprotobyname('ip')
 327                                 or die "socket: $!";
 328
 329                         if(ioctl SOCKET, $SIOCGIFHWADDR, $ifreq) {
 330                                 my ($if, $mac)= unpack 'h36 H12', $ifreq;
 331
 332                                 if (length($mac) > 0) {
 333                                         $mac=~ m/^([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])$/;
 334                                         $mac= sprintf("%s:%s:%s:%s:%s:%s", $1, $2, $3, $4, $5, $6);
 335                                         $result = $mac;
 336                                 }
 337                         }
 338                 }
 339         }
 340         return $result;
 341 }
 342
 343 sub get_vendor_for_mac {
 344         my $mac=shift;
 345         my $result="Unknown Vendor";
 346
 347         if(defined($mac)) {
 348                 my $vendor= Net::MAC::Vendor::fetch_oui_from_cache(Net::MAC::Vendor::normalize_mac($mac));
 349                 if(length($vendor) > 0) {
 350                         $result= @{$vendor}[0];
 351                 }
 352                 &main::daemon_log("Looking up Vendor for MAC ".$mac.": $result", 4);
 353         }
 354
 355         return $result;
 356 }
 357
 358 #===  FUNCTION  ================================================================
 359 #         NAME:  add_ldap_entry
 360 #      PURPOSE:  adds an element to ldap-tree
 361 #   PARAMETERS:
 362 #      RETURNS:  none
 363 #  DESCRIPTION:  ????
 364 #       THROWS:  no exceptions
 365 #     COMMENTS:  none
 366 #     SEE ALSO:  n/a/bin
 367 #===============================================================================
 368 sub add_ldap_entry {
 369     my ($ldap_tree, $ldap_base, $mac, $gotoSysStatus, $ip, $interface, $desc) = @_;
 370     my $dn = "cn=".$hosts_database->{$mac}->{cn}.",ou=incoming,$ldap_base";
 371     my $s_res = &search_ldap_entry($ldap_tree, $ldap_base, "(|(macAddress=$mac)(dhcpHWAddress=ethernet $mac))");
 372     my $c_res = (defined($s_res))?$s_res->count:0;
 373     if($c_res == 1) {
 374         &main::daemon_log("WARNING: macAddress $mac already in LDAP", 1);
 375         return;
 376     } elsif($c_res > 0) {
 377         &main::daemon_log("ERROR: macAddress $mac exists $c_res times in LDAP", 1);
 378         return;
 379     }
 380
 381     # create LDAP entry
 382     my $entry = Net::LDAP::Entry->new( $dn );
 383     $entry->dn($dn);
 384     $entry->add("objectClass" => "goHard");
 385     $entry->add("cn" => $hosts_database->{$mac}->{cn});
 386     $entry->add("macAddress" => $mac);
 387     if(defined $gotoSysStatus) {$entry->add("gotoSysStatus" => $gotoSysStatus)}
 388     if(defined $ip) {$entry->add("ipHostNumber" => $ip) }
 389     #if(defined $interface) { }
 390     if(defined $desc) {$entry->add("description" => $desc) }
 391
 392     # submit entry to LDAP
 393         my $result = $entry->update ($ldap_tree);
 394
 395     # for $result->code constants please look at Net::LDAP::Constant
 396     if($result->code == 68) {   # entry already exists
 397         &main::daemon_log("WARNING: $dn ".$result->error, 3);
 398     } elsif($result->code == 0) {   # everything went fine
 399         &main::daemon_log("add entry $dn to ldap", 1);
 400     } else {  # if any other error occur
 401         &main::daemon_log("ERROR: $dn, ".$result->code.", ".$result->error, 1);
 402     }
 403     return;
 404 }
 405
 406
 407 #===  FUNCTION  ================================================================
 408 #         NAME:  change_ldap_entry
 409 #      PURPOSE:  ????
 410 #   PARAMETERS:  ????
 411 #      RETURNS:  ????
 412 #  DESCRIPTION:  ????
 413 #       THROWS:  no exceptions
 414 #     COMMENTS:  none
 415 #     SEE ALSO:  n/a
 416 #===============================================================================
 417 sub change_ldap_entry {
 418     my ($ldap_tree, $ldap_base, $mac, $gotoSysStatus, $ip) = @_;
 419
 420     # check if ldap_entry exists or not
 421     my $s_res = &search_ldap_entry($ldap_tree, $ldap_base, "(|(macAddress=$mac)(dhcpHWAddress=ethernet $mac))");
 422     my $c_res = (defined $s_res)?$s_res->count:0;
 423     if($c_res == 0) {
 424         &main::daemon_log("WARNING: macAddress $mac not in LDAP", 1);
 425         return;
 426     } elsif($c_res > 1) {
 427         &main::daemon_log("ERROR: macAddress $mac exists $c_res times in LDAP", 1);
 428         return;
 429     }
 430
 431     my $s_res_entry = $s_res->pop_entry();
 432     my $dn = $s_res_entry->dn();
 433         my $replace = {
 434                 'gotoSysStatus' => $gotoSysStatus,
 435         };
 436         if (defined($ip)) {
 437                 $replace->{'ipHostNumber'} = $ip;
 438         }
 439     my $result = $ldap->modify( $dn, replace => $replace );
 440
 441     # for $result->code constants please look at Net::LDAP::Constant
 442     if($result->code == 32) {   # entry doesnt exists
 443         &add_ldap_entry($mac, $gotoSysStatus);
 444     } elsif($result->code == 0) {   # everything went fine
 445         &main::daemon_log("entry $dn changed successful", 1);
 446     } else {  # if any other error occur
 447         &main::daemon_log("ERROR: $dn, ".$result->code.", ".$result->error, 1);
 448     }
 449
 450     return;
 451 }
 452
 453 #===  FUNCTION  ================================================================
 454 #         NAME:  search_ldap_entry
 455 #      PURPOSE:  ????
 456 #   PARAMETERS:  [Net::LDAP] $ldap_tree - object of an ldap-tree
 457 #                string $sub_tree - dn of the subtree the search is performed
 458 #                string $search_string - either a string or a Net::LDAP::Filter object
 459 #      RETURNS:  [Net::LDAP::Search] $msg - result object of the performed search
 460 #  DESCRIPTION:  ????
 461 #       THROWS:  no exceptions
 462 #     COMMENTS:  none
 463 #     SEE ALSO:  n/a
 464 #===============================================================================
 465 sub search_ldap_entry {
 466         my ($ldap_tree, $sub_tree, $search_string) = @_;
 467         my $msg;
 468         if(defined($ldap_tree)) {
 469                 $msg = $ldap_tree->search( # perform a search
 470                         base   => $sub_tree,
 471                         filter => $search_string,
 472                 ) or &main::daemon_log("cannot perform search at ldap: $@", 1);
 473                 #if(defined $msg) {
 474         #    print $sub_tree."\t".$search_string."\t";
 475         #    print $msg->count."\n";
 476         #    foreach my $entry ($msg->entries) { $entry->dump; };
 477         #}
 478         }
 479         return $msg;
 480 }
 481 #        $ldap = Net::LDAP->new( "localhost" ) or die "$@";
 482 #        $ldap->bind($bind_phrase,
 483 #                    password => $password,
 484 #                    ) ;
 485 #
 486 #        switch($arp_sig) {
 487 #            case 0 {&change_ldap_entry($ldap, $ldap_base,
 488 #                                      $mac, "ip-changed",
 489 #                                      )}
 490 #            case 1 {&change_ldap_entry($ldap, $ldap_base,
 491 #                                      $mac, "mac-not-whitelisted",
 492 #                                      )}
 493 #            case 2 {&change_ldap_entry($ldap, $ldap_base,
 494 #                                      $mac, "mac-in-blacklist",
 495 #                                      )}
 496 #            case 3 {&add_ldap_entry($ldap, $ldap_base,
 497 #                                   $mac, "new-mac-address", $ip,
 498 #                                   $interface, $desc,
 499 #                                   )}
 500 #            case 4 {&change_ldap_entry($ldap, $ldap_base,
 501 #                                      $mac, "unauthorized-arp-request",
 502 #                                      )}
 503 #            case 5 {&change_ldap_entry($ldap, $ldap_base,
 504 #                                      $mac, "abusive-number-of-arp-requests",
 505 #                                      )}
 506 #            case 6 {&change_ldap_entry($ldap, $ldap_base,
 507 #                                      $mac, "ether-and-arp-mac-differs",
 508 #                                      )}
 509 #            case 7 {&change_ldap_entry($ldap, $ldap_base,
 510 #                                      $mac, "flood-detected",
 511 #                                      )}
 512 #            case 8 {&add_ldap_entry($ldap, $ldap_base,
 513 #                                   $mac, $ip, "new-system",
 514 #                                   )}
 515 #            case 9 {&change_ldap_entry($ldap, $ldap_base,
 516 #                                      $mac, "mac-changed",
 517 #                                      )}
 518 #        }
 519 #
 520 #
 521         # ldap search
 522 #        my $base_phrase = "dc=gonicus,dc=de";
 523 #        my $filter_phrase = "cn=keinesorge";
 524 #        my $attrs_phrase = "cn macAdress";
 525 #        my $msg_search = $ldap->search( base   => $base_phrase,
 526 #                                        filter => $filter_phrase,
 527 #                                        attrs => $attrs_phrase,
 528 #                                        );
 529 #        $msg_search->code && die $msg_search->error;
 530 #
 531 #        my @entries = $msg_search->entries;
 532 #        my $max = $msg_search->count;
 533 #        print "anzahl der entries: $max\n";
 534 #        my $i;
 535 #        for ( $i = 0 ; $i < $max ; $i++ ) {
 536 #            my $entry = $msg_search->entry ( $i );
 537 #            foreach my $attr ( $entry->attributes ) {
 538 #                if( not $attr eq "cn") {
 539 #                    next;
 540 #                }
 541 #                print join( "\n ", $attr, $entry->get_value( $attr ) ), "\n\n";
 542 #            }
 543 #        }
 544                 #
 545                 #        # ldap add
 546                 #
 547                 #
 548                 #        $ldap->unbind;
 549                 #        exit;
 550
 551 1;