1 package ArpHandler;
3 use Exporter;
4 @ISA = ("Exporter");
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;
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 $start_service=0;
26 }
27 }
29 END{}
31 my ($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;
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 );
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 }
76 sub get_module_info {
77 my @info = (undef,
78 undef,
79 undef,
80 undef,
81 "socket",
82 );
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 $ldap->bind();
99 }
100 }
102 # When interface is not configured (or 'all'), start arpwatch on all possible interfaces
103 if ((!defined($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+$/) {
107 next;
108 }
110 # If device has a valid mac address
111 # TODO: Check if this should be the right way
112 if(not(&get_mac($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 }
151 sub process_incoming_msg {
152 return 1;
153 }
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 );
164 $_[KERNEL]->post( sprintf("arp_watch_$device") => 'run' );
165 }
167 sub got_packet {
168 my ($kernel, $heap, $sender, $packet) = @_[KERNEL, HEAP, SENDER, ARG0];
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 }
176 my $capture_device = sprintf "%s", $kernel->alias_list($sender) =~ /^arp_watch_(.*)$/;
178 if(!exists($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 }
234 sub get_host_from_ldap {
235 my $mac=shift;
236 my $result={};
238 my $ldap_result= search_ldap_entry(
239 $ldap,
240 $ldap_base,
241 "(|(macAddress=$mac)(dhcpHWAddress=ethernet $mac))"
242 );
244 if(defined($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})) {
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 }
267 return $result;
268 }
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 $PROC_NET_DEV= ('/proc/net/dev');
280 open(PROC_NET_DEV, "<$PROC_NET_DEV")
281 or die "Could not open $PROC_NET_DEV";
283 my @ifs = <PROC_NET_DEV>;
285 close(PROC_NET_DEV);
287 # Eat first two line
288 shift @ifs;
289 shift @ifs;
291 chomp @ifs;
292 foreach my $line(@ifs) {
293 my $if= (split /:/, $line)[0];
294 $if =~ s/^\s+//;
295 push @result, $if;
296 }
298 return @result;
299 }
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
316 socket SOCKET, PF_INET, SOCK_DGRAM, getprotobyname('ip')
317 or die "socket: $!";
319 if(ioctl SOCKET, $SIOCGIFHWADDR, $ifreq) {
320 my ($if, $mac)= unpack 'h36 H12', $ifreq;
322 if (length($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 $result;
331 }
333 #=== FUNCTION ================================================================
334 # NAME: add_ldap_entry
335 # PURPOSE: adds an element to ldap-tree
336 # PARAMETERS:
337 # RETURNS: none
338 # DESCRIPTION: ????
339 # THROWS: no exceptions
340 # COMMENTS: none
341 # SEE ALSO: n/a/bin
342 #===============================================================================
343 sub add_ldap_entry {
344 my ($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 }
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) }
367 # submit entry to LDAP
368 my $result = $entry->update ($ldap_tree);
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.", ".$result->error, 1);
378 }
379 return;
380 }
383 #=== FUNCTION ================================================================
384 # NAME: change_ldap_entry
385 # PURPOSE: ????
386 # PARAMETERS: ????
387 # RETURNS: ????
388 # DESCRIPTION: ????
389 # THROWS: no exceptions
390 # COMMENTS: none
391 # SEE ALSO: n/a
392 #===============================================================================
393 sub change_ldap_entry {
394 my ($ldap_tree, $ldap_base, $mac, $gotoSysStatus ) = @_;
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 }
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 } );
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 }
421 return;
422 }
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;
522 1;