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