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 => $dnsname,
 201                                 cn => ($dnsname =~ /^(\d){1,3}\.(\d){1,3}\.(\d){1,3}\.(\d){1,3}/) ? $dnsname : sprintf "%s", $dnsname =~ /([^\.]+)\./,
 202                         };
 203                         &main::daemon_log("Host was not found in LDAP (".($hosts_database->{$packet->{source_haddr}}->{dnsname}).")",6);
 204                         &main::daemon_log(
 205                                 "New Host ".($hosts_database->{$packet->{source_haddr}}->{dnsname}).
 206                                 ": ".$hosts_database->{$packet->{source_haddr}}->{ipHostNumber}.
 207                                 "/".$hosts_database->{$packet->{source_haddr}}->{macAddress},4);
 208                         &add_ldap_entry(
 209                                 $ldap,
 210                                 $ldap_base,
 211                                 $hosts_database->{$packet->{source_haddr}}->{macAddress},
 212                                 'new-system',
 213                                 $hosts_database->{$packet->{source_haddr}}->{ipHostNumber});
 214                                 #,
 215 #                               #$hosts_database->{$packet->{source_haddr}}->{dnsName});
 216 #
 217 #            case 8 {&add_ldap_entry($ldap, $ldap_base,
 218 #                                   $mac, $ip, "new-system",
 219 #                                   )}
 220                 }
 221                 $hosts_database->{$packet->{source_haddr}}->{device}= $capture_device;
 222         } else {
 223                 if(!($hosts_database->{$packet->{source_haddr}}->{ipHostNumber} eq $packet->{source_ipaddr})) {
 224                         &main::daemon_log(
 225                                 "IP Address change of MAC ".$packet->{source_haddr}.
 226                                 ": ".$hosts_database->{$packet->{source_haddr}}->{ipHostNumber}.
 227                                 "->".$packet->{source_ipaddr}, 4);
 228                         $hosts_database->{$packet->{source_haddr}}->{ipHostNumber}= $packet->{source_ipaddr};
 229                 }
 230                 &main::daemon_log("Host already in cache (".($hosts_database->{$packet->{source_haddr}}->{device})."->".($hosts_database->{$packet->{source_haddr}}->{dnsname}).")",6);
 231         }
 232 }
 233
 234 sub get_host_from_ldap {
 235         my $mac=shift;
 236         my $result={};
 237
 238         my $ldap_result= search_ldap_entry(
 239                 $ldap,
 240                 $ldap_base,
 241                 "(|(macAddress=$mac)(dhcpHWAddress=ethernet $mac))"
 242         );
 243
 244         if(defined($ldap_result) && $ldap_result->count==1) {
 245                 if(exists($ldap_result->{entries}[0]) &&
 246                         exists($ldap_result->{entries}[0]->{asn}->{objectName}) &&
 247                         exists($ldap_result->{entries}[0]->{asn}->{attributes})) {
 248
 249                         for my $attribute(@{$ldap_result->{entries}[0]->{asn}->{attributes}}) {
 250                                 if($attribute->{type} eq 'cn') {
 251                                         $result->{cn} = $attribute->{vals}[0];
 252                                 }
 253                                 if($attribute->{type} eq 'macAddress') {
 254                                         $result->{macAddress} = $attribute->{vals}[0];
 255                                 }
 256                                 if($attribute->{type} eq 'dhcpHWAddress') {
 257                                         $result->{dhcpHWAddress} = $attribute->{vals}[0];
 258                                 }
 259                                 if($attribute->{type} eq 'ipHostNumber') {
 260                                         $result->{ipHostNumber} = $attribute->{vals}[0];
 261                                 }
 262                         }
 263                 }
 264                 $result->{dn} = $ldap_result->{entries}[0]->{asn}->{objectName};
 265         }
 266
 267         return $result;
 268 }
 269
 270 #===  FUNCTION  ================================================================
 271 #         NAME:  get_interfaces
 272 #   PARAMETERS:  none
 273 #      RETURNS:  (list of interfaces)
 274 #  DESCRIPTION:  Uses proc fs (/proc/net/dev) to get list of interfaces.
 275 #===============================================================================
 276 sub get_interfaces {
 277         my @result;
 278         my $PROC_NET_DEV= ('/proc/net/dev');
 279
 280         open(PROC_NET_DEV, "<$PROC_NET_DEV")
 281                 or die "Could not open $PROC_NET_DEV";
 282
 283         my @ifs = <PROC_NET_DEV>;
 284
 285         close(PROC_NET_DEV);
 286
 287         # Eat first two line
 288         shift @ifs;
 289         shift @ifs;
 290
 291         chomp @ifs;
 292         foreach my $line(@ifs) {
 293                 my $if= (split /:/, $line)[0];
 294                 $if =~ s/^\s+//;
 295                 push @result, $if;
 296         }
 297
 298         return @result;
 299 }
 300
 301 #===  FUNCTION  ================================================================
 302 #         NAME:  get_mac
 303 #   PARAMETERS:  interface name (i.e. eth0)
 304 #      RETURNS:  (mac address)
 305 #  DESCRIPTION:  Uses ioctl to get mac address directly from system.
 306 #===============================================================================
 307 sub get_mac {
 308         my $ifreq= shift;
 309         my $result;
 310         if ($ifreq && length($ifreq) > 0) {
 311                 if($ifreq eq "all") {
 312                         $result = "00:00:00:00:00:00";
 313                 } else {
 314                         my $SIOCGIFHWADDR= 0x8927;     # man 2 ioctl_list
 315
 316                         socket SOCKET, PF_INET, SOCK_DGRAM, getprotobyname('ip')
 317                                 or die "socket: $!";
 318
 319                         if(ioctl SOCKET, $SIOCGIFHWADDR, $ifreq) {
 320                                 my ($if, $mac)= unpack 'h36 H12', $ifreq;
 321
 322                                 if (length($mac) > 0) {
 323                                         $mac=~ m/^([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])$/;
 324                                         $mac= sprintf("%s:%s:%s:%s:%s:%s", $1, $2, $3, $4, $5, $6);
 325                                         $result = $mac;
 326                                 }
 327                         }
 328                 }
 329         }
 330         return $result;
 331 }
 332
 333 #===  FUNCTION  ================================================================
 334 #         NAME:  add_ldap_entry
 335 #      PURPOSE:  adds an element to ldap-tree
 336 #   PARAMETERS:
 337 #      RETURNS:  none
 338 #  DESCRIPTION:  ????
 339 #       THROWS:  no exceptions
 340 #     COMMENTS:  none
 341 #     SEE ALSO:  n/a/bin
 342 #===============================================================================
 343 sub add_ldap_entry {
 344     my ($ldap_tree, $ldap_base, $mac, $gotoSysStatus, $ip, $interface, $desc) = @_;
 345     my $dn = "cn=".$hosts_database->{$mac}->{cn}.",ou=incoming,$ldap_base";
 346     my $s_res = &search_ldap_entry($ldap_tree, $ldap_base, "(|(macAddress=$mac)(dhcpHWAddress=ethernet $mac))");
 347     my $c_res = (defined($s_res))?$s_res->count:0;
 348     if($c_res == 1) {
 349         &main::daemon_log("WARNING: macAddress $mac already in LDAP", 1);
 350         return;
 351     } elsif($c_res > 0) {
 352         &main::daemon_log("ERROR: macAddress $mac exists $c_res times in LDAP", 1);
 353         return;
 354     }
 355
 356     # create LDAP entry
 357     my $entry = Net::LDAP::Entry->new( $dn );
 358     $entry->dn($dn);
 359     $entry->add("objectClass" => "goHard");
 360     $entry->add("cn" => $hosts_database->{$mac}->{cn});
 361     $entry->add("macAddress" => $mac);
 362     if(defined $gotoSysStatus) {$entry->add("gotoSysStatus" => $gotoSysStatus)}
 363     if(defined $ip) {$entry->add("ipHostNumber" => $ip) }
 364     #if(defined $interface) { }
 365     if(defined $desc) {$entry->add("description" => $desc) }
 366
 367     # submit entry to LDAP
 368     my $result = $entry->update ($ldap_tree);
 369
 370     # for $result->code constants please look at Net::LDAP::Constant
 371     my $log_time = localtime( time );
 372     if($result->code == 68) {   # entry already exists
 373         &main::daemon_log("WARNING: $log_time: $dn ".$result->error, 3);
 374     } elsif($result->code == 0) {   # everything went fine
 375         &main::daemon_log("$log_time: add entry $dn to ldap", 1);
 376     } else {  # if any other error occur
 377         &main::daemon_log("ERROR: $log_time: $dn, ".$result->code.", ".$result->error, 1);
 378     }
 379     return;
 380 }
 381
 382
 383 #===  FUNCTION  ================================================================
 384 #         NAME:  change_ldap_entry
 385 #      PURPOSE:  ????
 386 #   PARAMETERS:  ????
 387 #      RETURNS:  ????
 388 #  DESCRIPTION:  ????
 389 #       THROWS:  no exceptions
 390 #     COMMENTS:  none
 391 #     SEE ALSO:  n/a
 392 #===============================================================================
 393 sub change_ldap_entry {
 394     my ($ldap_tree, $ldap_base, $mac, $gotoSysStatus ) = @_;
 395
 396     # check if ldap_entry exists or not
 397     my $s_res = &search_ldap_entry($ldap_tree, $ldap_base, "(|(macAddress=$mac)(dhcpHWAddress=ethernet $mac))");
 398     my $c_res = $s_res->count;
 399     if($c_res == 0) {
 400         daemon_log("WARNING: macAddress $mac not in LDAP", 1);
 401         return;
 402     } elsif($c_res > 1) {
 403         daemon_log("ERROR: macAddress $mac exists $c_res times in LDAP", 1);
 404         return;
 405     }
 406
 407     my $s_res_entry = $s_res->pop_entry();
 408     my $dn = $s_res_entry->dn();
 409     my $result = $ldap->modify( $dn, replace => {'gotoSysStatus' => $gotoSysStatus } );
 410
 411     # for $result->code constants please look at Net::LDAP::Constant
 412     my $log_time = localtime( time );
 413     if($result->code == 32) {   # entry doesnt exists
 414         &add_ldap_entry($mac, $gotoSysStatus);
 415     } elsif($result->code == 0) {   # everything went fine
 416         daemon_log("$log_time: entry $dn changed successful", 1);
 417     } else {  # if any other error occur
 418         daemon_log("ERROR: $log_time: $dn, ".$result->code.", ".$result->error, 1);
 419     }
 420
 421     return;
 422 }
 423
 424 #===  FUNCTION  ================================================================
 425 #         NAME:  search_ldap_entry
 426 #      PURPOSE:  ????
 427 #   PARAMETERS:  [Net::LDAP] $ldap_tree - object of an ldap-tree
 428 #                string $sub_tree - dn of the subtree the search is performed
 429 #                string $search_string - either a string or a Net::LDAP::Filter object
 430 #      RETURNS:  [Net::LDAP::Search] $msg - result object of the performed search
 431 #  DESCRIPTION:  ????
 432 #       THROWS:  no exceptions
 433 #     COMMENTS:  none
 434 #     SEE ALSO:  n/a
 435 #===============================================================================
 436 sub search_ldap_entry {
 437         my ($ldap_tree, $sub_tree, $search_string) = @_;
 438         my $msg;
 439         if(defined($ldap_tree)) {
 440                 my $msg = $ldap_tree->search( # perform a search
 441                         base   => $sub_tree,
 442                         filter => $search_string,
 443                 ) or daemon_log("cannot perform search at ldap: $@", 1);
 444 #    if(defined $msg) {
 445 #        print $sub_tree."\t".$search_string."\t";
 446 #        print $msg->count."\n";
 447 #        foreach my $entry ($msg->entries) { $entry->dump; };
 448 #    }
 449         }
 450         return $msg;
 451 }
 452 #        $ldap = Net::LDAP->new( "localhost" ) or die "$@";
 453 #        $ldap->bind($bind_phrase,
 454 #                    password => $password,
 455 #                    ) ;
 456 #
 457 #        switch($arp_sig) {
 458 #            case 0 {&change_ldap_entry($ldap, $ldap_base,
 459 #                                      $mac, "ip-changed",
 460 #                                      )}
 461 #            case 1 {&change_ldap_entry($ldap, $ldap_base,
 462 #                                      $mac, "mac-not-whitelisted",
 463 #                                      )}
 464 #            case 2 {&change_ldap_entry($ldap, $ldap_base,
 465 #                                      $mac, "mac-in-blacklist",
 466 #                                      )}
 467 #            case 3 {&add_ldap_entry($ldap, $ldap_base,
 468 #                                   $mac, "new-mac-address", $ip,
 469 #                                   $interface, $desc,
 470 #                                   )}
 471 #            case 4 {&change_ldap_entry($ldap, $ldap_base,
 472 #                                      $mac, "unauthorized-arp-request",
 473 #                                      )}
 474 #            case 5 {&change_ldap_entry($ldap, $ldap_base,
 475 #                                      $mac, "abusive-number-of-arp-requests",
 476 #                                      )}
 477 #            case 6 {&change_ldap_entry($ldap, $ldap_base,
 478 #                                      $mac, "ether-and-arp-mac-differs",
 479 #                                      )}
 480 #            case 7 {&change_ldap_entry($ldap, $ldap_base,
 481 #                                      $mac, "flood-detected",
 482 #                                      )}
 483 #            case 8 {&add_ldap_entry($ldap, $ldap_base,
 484 #                                   $mac, $ip, "new-system",
 485 #                                   )}
 486 #            case 9 {&change_ldap_entry($ldap, $ldap_base,
 487 #                                      $mac, "mac-changed",
 488 #                                      )}
 489 #        }
 490 #
 491 #
 492         # ldap search
 493 #        my $base_phrase = "dc=gonicus,dc=de";
 494 #        my $filter_phrase = "cn=keinesorge";
 495 #        my $attrs_phrase = "cn macAdress";
 496 #        my $msg_search = $ldap->search( base   => $base_phrase,
 497 #                                        filter => $filter_phrase,
 498 #                                        attrs => $attrs_phrase,
 499 #                                        );
 500 #        $msg_search->code && die $msg_search->error;
 501 #
 502 #        my @entries = $msg_search->entries;
 503 #        my $max = $msg_search->count;
 504 #        print "anzahl der entries: $max\n";
 505 #        my $i;
 506 #        for ( $i = 0 ; $i < $max ; $i++ ) {
 507 #            my $entry = $msg_search->entry ( $i );
 508 #            foreach my $attr ( $entry->attributes ) {
 509 #                if( not $attr eq "cn") {
 510 #                    next;
 511 #                }
 512 #                print join( "\n ", $attr, $entry->get_value( $attr ) ), "\n\n";
 513 #            }
 514 #        }
 515                 #
 516                 #        # ldap add
 517                 #
 518                 #
 519                 #        $ldap->unbind;
 520                 #        exit;
 521
 522 1;