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