ee7cdd5b6c21b04ef293472ea941323ac43d4007
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 => $dnsname,
201 };
202 &main::daemon_log("Host was not found in LDAP (".($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 }
233 sub get_host_from_ldap {
234 my $mac=shift;
235 my $result={};
237 my $ldap_result= search_ldap_entry(
238 $ldap,
239 $ldap_base,
240 "(|(macAddress=$mac)(dhcpHWAddress=ethernet $mac))"
241 );
243 if(defined($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})) {
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 }
266 return $result;
267 }
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 $PROC_NET_DEV= ('/proc/net/dev');
279 open(PROC_NET_DEV, "<$PROC_NET_DEV")
280 or die "Could not open $PROC_NET_DEV";
282 my @ifs = <PROC_NET_DEV>;
284 close(PROC_NET_DEV);
286 # Eat first two line
287 shift @ifs;
288 shift @ifs;
290 chomp @ifs;
291 foreach my $line(@ifs) {
292 my $if= (split /:/, $line)[0];
293 $if =~ s/^\s+//;
294 push @result, $if;
295 }
297 return @result;
298 }
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
315 socket SOCKET, PF_INET, SOCK_DGRAM, getprotobyname('ip')
316 or die "socket: $!";
318 if(ioctl SOCKET, $SIOCGIFHWADDR, $ifreq) {
319 my ($if, $mac)= unpack 'h36 H12', $ifreq;
321 if (length($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 $result;
330 }
332 #=== FUNCTION ================================================================
333 # NAME: add_ldap_entry
334 # PURPOSE: adds an element to ldap-tree
335 # PARAMETERS:
336 # RETURNS: none
337 # DESCRIPTION: ????
338 # THROWS: no exceptions
339 # COMMENTS: none
340 # SEE ALSO: n/a/bin
341 #===============================================================================
342 sub add_ldap_entry {
343 my ($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 }
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) }
366 # submit entry to LDAP
367 my $result = $entry->update ($ldap_tree);
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.", ".$result->error, 1);
377 }
378 return;
379 }
382 #=== FUNCTION ================================================================
383 # NAME: change_ldap_entry
384 # PURPOSE: ????
385 # PARAMETERS: ????
386 # RETURNS: ????
387 # DESCRIPTION: ????
388 # THROWS: no exceptions
389 # COMMENTS: none
390 # SEE ALSO: n/a
391 #===============================================================================
392 sub change_ldap_entry {
393 my ($ldap_tree, $ldap_base, $mac, $gotoSysStatus ) = @_;
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 }
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 } );
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 }
420 return;
421 }
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;
521 1;