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 use utf8;
  18
  19 # Don't start if some of the modules are missing
  20 my $start_service=1;
  21 my $lookup_vendor=1;
  22 BEGIN{
  23         unless(eval('use Socket qw(PF_INET SOCK_DGRAM inet_ntoa sockaddr_in)')) {
  24                 $start_service=0;
  25         }
  26         unless(eval('use POE qw(Component::Pcap Component::ArpWatch)')) {
  27                 $start_service=0;
  28         }
  29         unless(eval('use Net::MAC::Vendor')) {
  30                 $lookup_vendor=0;
  31         }
  32 }
  33
  34 END{}
  35
  36 my ($timeout, $mailto, $mailfrom, $user, $group);
  37 my ($arp_enabled, $arp_interface, $ldap_uri, $ldap_base, $ldap_admin_dn, $ldap_admin_password);
  38 my $hosts_database={};
  39 my $resolver=Net::DNS::Resolver->new;
  40 my $ldap;
  41
  42 my %cfg_defaults =
  43 (
  44         "ArpHandler" => {
  45                 "enabled"           => [\$arp_enabled,         "true"],
  46                 "interface"       => [\$arp_interface,    "all"],
  47         },
  48         "server" => {
  49                 "ldap-uri"            => [\$ldap_uri,            ""],
  50                 "ldap-base"           => [\$ldap_base,           ""],
  51                 "ldap-admin-dn"       => [\$ldap_admin_dn,       ""],
  52                 "ldap-admin-password" => [\$ldap_admin_password, ""],
  53         },
  54 );
  55
  56 #===  FUNCTION  ================================================================
  57 #         NAME:  read_configfile
  58 #   PARAMETERS:  cfg_file - string -
  59 #      RETURNS:  nothing
  60 #  DESCRIPTION:  read cfg_file and set variables
  61 #===============================================================================
  62 sub read_configfile {
  63         my $cfg;
  64         if( defined( $main::cfg_file) && ( length($main::cfg_file) > 0 )) {
  65                 if( -r $main::cfg_file ) {
  66                         $cfg = Config::IniFiles->new( -file => $main::cfg_file );
  67                 } else {
  68                         print STDERR "Couldn't read config file!";
  69                 }
  70         } else {
  71                 $cfg = Config::IniFiles->new() ;
  72         }
  73         foreach my $section (keys %cfg_defaults) {
  74                 foreach my $param (keys %{$cfg_defaults{ $section }}) {
  75                         my $pinfo = $cfg_defaults{ $section }{ $param };
  76                         ${@$pinfo[0]} = $cfg->val( $section, $param, @$pinfo[1] );
  77                 }
  78         }
  79 }
  80
  81 sub get_module_info {
  82         my @info = (undef,
  83                 undef,
  84         );
  85
  86         &read_configfile();
  87         # Don't start if some of the modules are missing
  88         if(($arp_enabled eq 'true') && $start_service) {
  89                 if($lookup_vendor) {
  90                         eval("Net::MAC::Vendor::load_cache('file:///usr/lib/gosa-si/modules/oui.txt')");
  91                         if($@) {
  92                                 &main::daemon_log("Loading OUI cache file failed! MAC Vendor lookup disabled", 1);
  93                                 $lookup_vendor=0;
  94                         } else {
  95                                 &main::daemon_log("Loading OUI cache file suceeded!", 6);
  96                         }
  97                 }
  98                 if(defined($ldap_uri) && length($ldap_uri)>0) {
  99                         &main::refresh_ldap_handle();
 100                         if (!$main::ldap_handle) {
 101                                 &main::daemon_log("Could not connect to LDAP Server at $ldap_uri!\n$@", 1);
 102                         }
 103                 } else {
 104                         $main::ldap_handle= undef;
 105                 }
 106
 107                 # When interface is not configured (or 'all'), start arpwatch on all possible interfaces
 108                 if ((!defined($arp_interface)) || $arp_interface eq 'all') {
 109                         foreach my $device(&get_interfaces) {
 110                                 # TODO: Need a better workaround for IPv4-to-IPv6 bridges
 111                                 if($device =~ m/^sit\d+$/) {
 112                                         next;
 113                                 }
 114
 115                                 # If device has a valid mac address
 116                                 # TODO: Check if this should be the right way
 117                                 if(not(&get_mac($device) eq "00:00:00:00:00:00")) {
 118                                         &main::daemon_log("Starting ArpWatch on $device", 1);
 119                                         POE::Session->create(
 120                                                 inline_states => {
 121                                                         _start => sub {
 122                                                                 &start(@_,$device);
 123                                                         },
 124                                                         _stop => sub {
 125                                                                 $_[KERNEL]->post( sprintf("arp_watch_$device") => 'shutdown' )
 126                                                         },
 127                                                         got_packet => \&got_packet,
 128                                                 },
 129                                         );
 130                                 }
 131                         }
 132                 } else {
 133                         foreach my $device(split(/[\s,]+/, $arp_interface)) {
 134                                 &main::daemon_log("Starting ArpWatch on $device", 1);
 135                                 POE::Session->create(
 136                                         inline_states => {
 137                                                 _start => sub {
 138                                                         &start(@_,$device);
 139                                                 },
 140                                                 _stop => sub {
 141                                                         $_[KERNEL]->post( sprintf("arp_watch_$device") => 'shutdown' )
 142                                                 },
 143                                                 got_packet => \&got_packet,
 144                                         },
 145                                 );
 146                         }
 147                 }
 148         } else {
 149                 &main::daemon_log("ArpHandler disabled. Not starting any capture processes");
 150         }
 151         return \@info;
 152 }
 153
 154 sub process_incoming_msg {
 155         return 1;
 156 }
 157
 158 sub start {
 159         my $device = (exists($_[ARG0])?$_[ARG0]:'eth0');
 160         POE::Component::ArpWatch->spawn(
 161                 Alias => sprintf("arp_watch_$device"),
 162                 Device => $device,
 163                 Dispatch => 'got_packet',
 164                 Session => $_[SESSION],
 165         );
 166
 167         $_[KERNEL]->post( sprintf("arp_watch_$device") => 'run' );
 168 }
 169
 170 sub got_packet {
 171         my ($kernel, $heap, $sender, $packet) = @_[KERNEL, HEAP, SENDER, ARG0];
 172
 173         if(     $packet->{source_haddr} eq "00:00:00:00:00:00" ||
 174                 $packet->{source_haddr} eq "ff:ff:ff:ff:ff:ff" ||
 175                 $packet->{source_ipaddr} eq "0.0.0.0") {
 176                 return;
 177         }
 178
 179         my $capture_device = sprintf "%s", $kernel->alias_list($sender) =~ /^arp_watch_(.*)$/;
 180
 181         if(!exists($hosts_database->{$packet->{source_haddr}})) {
 182                 my $dnsresult= $resolver->search($packet->{source_ipaddr});
 183                 my $dnsname= (defined($dnsresult))?$dnsresult->{answer}[0]->{ptrdname}:$packet->{source_ipaddr};
 184                 my $ldap_result=&get_host_from_ldap($packet->{source_haddr});
 185                 if(exists($ldap_result->{dn})) {
 186                         $hosts_database->{$packet->{source_haddr}}=$ldap_result;
 187                         $hosts_database->{$packet->{source_haddr}}->{dnsname}= $dnsname;
 188                         if(!exists($ldap_result->{ipHostNumber})) {
 189                                 $hosts_database->{$packet->{source_haddr}}->{ipHostNumber}=$packet->{source_ipaddr};
 190                         } else {
 191                                 if(!($ldap_result->{ipHostNumber} eq $packet->{source_ipaddr})) {
 192                                         &main::daemon_log(
 193                                                 "Current IP Address ".$packet->{source_ipaddr}.
 194                                                 " of host ".$hosts_database->{$packet->{source_haddr}}->{dnsname}.
 195                                                 " differs from LDAP (".$ldap_result->{ipHostNumber}.")", 4);
 196                                 }
 197                         }
 198                         $hosts_database->{$packet->{source_haddr}}->{dnsname}=$dnsname;
 199                         &main::daemon_log("Host was found in LDAP as ".$ldap_result->{dn}, 8);
 200                 } else {
 201                         $hosts_database->{$packet->{source_haddr}}={
 202                                 macAddress => $packet->{source_haddr},
 203                                 ipHostNumber => $packet->{source_ipaddr},
 204                                 dnsname => $dnsname,
 205                                 cn => (($dnsname =~ /^(\d){1,3}\.(\d){1,3}\.(\d){1,3}\.(\d){1,3}/) ? $dnsname : sprintf "%s", $dnsname =~ /([^\.]+)\./),
 206                                 macVendor => (($lookup_vendor) ? &get_vendor_for_mac($packet->{source_haddr}) : "Unknown Vendor"),
 207                         };
 208                         &main::daemon_log("Host was not found in LDAP (".($hosts_database->{$packet->{source_haddr}}->{dnsname}).")",6);
 209                         &main::daemon_log(
 210                                 "New Host ".($hosts_database->{$packet->{source_haddr}}->{dnsname}).
 211                                 ": ".$hosts_database->{$packet->{source_haddr}}->{ipHostNumber}.
 212                                 "/".$hosts_database->{$packet->{source_haddr}}->{macAddress},4);
 213                         &add_ldap_entry(
 214                                 $main::ldap_handle,
 215                                 $ldap_base,
 216                                 $hosts_database->{$packet->{source_haddr}}->{macAddress},
 217                                 'new-system',
 218                                 $hosts_database->{$packet->{source_haddr}}->{ipHostNumber},
 219                                 'interface',
 220                                 $hosts_database->{$packet->{source_haddr}}->{macVendor});
 221                 }
 222                 $hosts_database->{$packet->{source_haddr}}->{device}= $capture_device;
 223         } else {
 224                 if(!($hosts_database->{$packet->{source_haddr}}->{ipHostNumber} eq $packet->{source_ipaddr})) {
 225                         &main::daemon_log(
 226                                 "IP Address change of MAC ".$packet->{source_haddr}.
 227                                 ": ".$hosts_database->{$packet->{source_haddr}}->{ipHostNumber}.
 228                                 "->".$packet->{source_ipaddr}, 4);
 229                         $hosts_database->{$packet->{source_haddr}}->{ipHostNumber}= $packet->{source_ipaddr};
 230                         &change_ldap_entry(
 231                                 $main::ldap_handle,
 232                                 $ldap_base,
 233                                 $hosts_database->{$packet->{source_haddr}}->{macAddress},
 234                                 'ip-changed',
 235                                 $hosts_database->{$packet->{source_haddr}}->{ipHostNumber},
 236                         );
 237
 238                 }
 239                 &main::daemon_log("Host already in cache (".($hosts_database->{$packet->{source_haddr}}->{device})."->".($hosts_database->{$packet->{source_haddr}}->{dnsname}).")",8);
 240         }
 241 }
 242
 243 sub get_host_from_ldap {
 244         my $mac=shift;
 245         my $result={};
 246
 247         if(defined($main::ldap_handle)) {
 248                 my $ldap_result= &search_ldap_entry(
 249                         $main::ldap_handle,
 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
 278         return $result;
 279 }
 280
 281 #===  FUNCTION  ================================================================
 282 #         NAME:  get_interfaces
 283 #   PARAMETERS:  none
 284 #      RETURNS:  (list of interfaces)
 285 #  DESCRIPTION:  Uses proc fs (/proc/net/dev) to get list of interfaces.
 286 #===============================================================================
 287 sub get_interfaces {
 288         my @result;
 289         my $PROC_NET_DEV= ('/proc/net/dev');
 290
 291         open(PROC_NET_DEV, "<$PROC_NET_DEV")
 292                 or die "Could not open $PROC_NET_DEV";
 293
 294         my @ifs = <PROC_NET_DEV>;
 295
 296         close(PROC_NET_DEV);
 297
 298         # Eat first two line
 299         shift @ifs;
 300         shift @ifs;
 301
 302         chomp @ifs;
 303         foreach my $line(@ifs) {
 304                 my $if= (split /:/, $line)[0];
 305                 $if =~ s/^\s+//;
 306                 push @result, $if;
 307         }
 308
 309         return @result;
 310 }
 311
 312 #===  FUNCTION  ================================================================
 313 #         NAME:  get_mac
 314 #   PARAMETERS:  interface name (i.e. eth0)
 315 #      RETURNS:  (mac address)
 316 #  DESCRIPTION:  Uses ioctl to get mac address directly from system.
 317 #===============================================================================
 318 sub get_mac {
 319         my $ifreq= shift;
 320         my $result;
 321         if ($ifreq && length($ifreq) > 0) {
 322                 if($ifreq eq "all") {
 323                         $result = "00:00:00:00:00:00";
 324                 } else {
 325                         my $SIOCGIFHWADDR= 0x8927;     # man 2 ioctl_list
 326
 327                         socket SOCKET, PF_INET, SOCK_DGRAM, getprotobyname('ip')
 328                                 or die "socket: $!";
 329
 330                         if(ioctl SOCKET, $SIOCGIFHWADDR, $ifreq) {
 331                                 my ($if, $mac)= unpack 'h36 H12', $ifreq;
 332
 333                                 if (length($mac) > 0) {
 334                                         $mac=~ m/^([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])$/;
 335                                         $mac= sprintf("%s:%s:%s:%s:%s:%s", $1, $2, $3, $4, $5, $6);
 336                                         $result = $mac;
 337                                 }
 338                         }
 339                 }
 340         }
 341         return $result;
 342 }
 343
 344 sub get_vendor_for_mac {
 345         my $mac=shift;
 346         my $result="Unknown Vendor";
 347
 348         if(defined($mac)) {
 349                 my $vendor= Net::MAC::Vendor::fetch_oui_from_cache(Net::MAC::Vendor::normalize_mac($mac));
 350                 if(length($vendor) > 0) {
 351                         $result= @{$vendor}[0];
 352                 }
 353                 &main::daemon_log("Looking up Vendor for MAC ".$mac.": $result", 4);
 354         }
 355
 356         return $result;
 357 }
 358
 359 #===  FUNCTION  ================================================================
 360 #         NAME:  add_ldap_entry
 361 #      PURPOSE:  adds an element to ldap-tree
 362 #   PARAMETERS:
 363 #      RETURNS:  none
 364 #  DESCRIPTION:  ????
 365 #       THROWS:  no exceptions
 366 #     COMMENTS:  none
 367 #     SEE ALSO:  n/a/bin
 368 #===============================================================================
 369 sub add_ldap_entry {
 370         my ($ldap_tree, $ldap_base, $mac, $gotoSysStatus, $ip, $interface, $desc) = @_;
 371         if(defined($ldap_tree)) {
 372                 my $dn = "cn=".$hosts_database->{$mac}->{cn}.",ou=incoming,$ldap_base";
 373                 my $s_res = &search_ldap_entry($ldap_tree, $ldap_base, "(|(macAddress=$mac)(dhcpHWAddress=ethernet $mac))");
 374                 my $c_res = (defined($s_res))?$s_res->count:0;
 375                 if($c_res == 1) {
 376                         &main::daemon_log("WARNING: macAddress $mac already in LDAP", 1);
 377                         return;
 378                 } elsif($c_res > 0) {
 379                         &main::daemon_log("ERROR: macAddress $mac exists $c_res times in LDAP", 1);
 380                         return;
 381                 }
 382
 383                 # create LDAP entry
 384                 my $entry = Net::LDAP::Entry->new( $dn );
 385                 $entry->dn($dn);
 386                 $entry->add("objectClass" => "goHard");
 387                 $entry->add("cn" => $hosts_database->{$mac}->{cn});
 388                 $entry->add("macAddress" => $mac);
 389                 if(defined $gotoSysStatus) {$entry->add("gotoSysStatus" => $gotoSysStatus)}
 390                 if(defined $ip) {$entry->add("ipHostNumber" => $ip) }
 391                 #if(defined $interface) { }
 392                 if(defined $desc) {$entry->add("description" => $desc) }
 393
 394                 # submit entry to LDAP
 395                 my $result = $entry->update ($ldap_tree);
 396
 397                 # for $result->code constants please look at Net::LDAP::Constant
 398                 if($result->code == 68) {   # entry already exists
 399                         &main::daemon_log("WARNING: $dn ".$result->error, 3);
 400                 } elsif($result->code == 0) {   # everything went fine
 401                         &main::daemon_log("add entry $dn to ldap", 1);
 402                 } else {  # if any other error occur
 403                         &main::daemon_log("ERROR: $dn, ".$result->code.", ".$result->error, 1);
 404                 }
 405         } else {
 406                 &main::daemon_log("Not adding new Entry: LDAP disabled", 6);
 407         }
 408         return;
 409 }
 410
 411
 412 #===  FUNCTION  ================================================================
 413 #         NAME:  change_ldap_entry
 414 #      PURPOSE:  ????
 415 #   PARAMETERS:  ????
 416 #      RETURNS:  ????
 417 #  DESCRIPTION:  ????
 418 #       THROWS:  no exceptions
 419 #     COMMENTS:  none
 420 #     SEE ALSO:  n/a
 421 #===============================================================================
 422 sub change_ldap_entry {
 423         my ($ldap_tree, $ldap_base, $mac, $gotoSysStatus, $ip) = @_;
 424
 425         if(defined($ldap_tree)) {
 426                 # check if ldap_entry exists or not
 427                 my $s_res = &search_ldap_entry($ldap_tree, $ldap_base, "(|(macAddress=$mac)(dhcpHWAddress=ethernet $mac))");
 428                 my $c_res = (defined $s_res)?$s_res->count:0;
 429                 if($c_res == 0) {
 430                         &main::daemon_log("WARNING: macAddress $mac not in LDAP", 1);
 431                         return;
 432                 } elsif($c_res > 1) {
 433                         &main::daemon_log("ERROR: macAddress $mac exists $c_res times in LDAP", 1);
 434                         return;
 435                 }
 436
 437                 my $s_res_entry = $s_res->pop_entry();
 438                 my $dn = $s_res_entry->dn();
 439                 my $replace = {
 440                         'gotoSysStatus' => $gotoSysStatus,
 441                 };
 442                 if (defined($ip)) {
 443                         $replace->{'ipHostNumber'} = $ip;
 444                 }
 445                 my $result = $main::ldap_handle->modify( $dn, replace => $replace );
 446
 447                 # for $result->code constants please look at Net::LDAP::Constant
 448                 if($result->code == 32) {   # entry doesnt exists
 449                         &add_ldap_entry($mac, $gotoSysStatus);
 450                 } elsif($result->code == 0) {   # everything went fine
 451                         &main::daemon_log("entry $dn changed successful", 1);
 452                 } else {  # if any other error occur
 453                         &main::daemon_log("ERROR: $dn, ".$result->code.", ".$result->error, 1);
 454                 }
 455         } else {
 456                 &main::daemon_log("Not changing Entry: LDAP disabled", 6);
 457         }
 458
 459         return;
 460 }
 461
 462 #===  FUNCTION  ================================================================
 463 #         NAME:  search_ldap_entry
 464 #      PURPOSE:  ????
 465 #   PARAMETERS:  [Net::LDAP] $ldap_tree - object of an ldap-tree
 466 #                string $sub_tree - dn of the subtree the search is performed
 467 #                string $search_string - either a string or a Net::LDAP::Filter object
 468 #      RETURNS:  [Net::LDAP::Search] $msg - result object of the performed search
 469 #  DESCRIPTION:  ????
 470 #       THROWS:  no exceptions
 471 #     COMMENTS:  none
 472 #     SEE ALSO:  n/a
 473 #===============================================================================
 474 sub search_ldap_entry {
 475         my ($ldap_tree, $sub_tree, $search_string) = @_;
 476         my $msg;
 477         if(defined($ldap_tree)) {
 478                 $msg = $ldap_tree->search( # perform a search
 479                         base   => $sub_tree,
 480                         filter => $search_string,
 481                 ) or &main::daemon_log("cannot perform search at ldap: $@", 1);
 482         }
 483         return $msg;
 484 }
 485
 486 1;