3 * StatusNet, the distributed open-source microblogging tool
5 * Plugin to enable LDAP Authentication
9 * LICENCE: This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU Affero General Public License as published by
11 * the Free Software Foundation, either version 3 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Affero General Public License for more details.
19 * You should have received a copy of the GNU Affero General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 * @author Craig Andrews <candrews@integralblue.com>
25 * @copyright 2009 Craig Andrews http://candrews.integralblue.com
26 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
27 * @link http://status.net/
30 if (!defined('STATUSNET') && !defined('LACONICA')) {
34 require_once 'Net/LDAP2.php';
36 class LdapAuthenticationPlugin extends AuthenticationPlugin
41 public $starttls=null;
48 public $password_encoding=null;
49 public $attributes=array();
51 function onInitializePlugin(){
52 parent::onInitializePlugin();
53 if(!isset($this->host)){
54 throw new Exception("must specify a host");
56 if(!isset($this->basedn)){
57 throw new Exception("must specify a basedn");
59 if(!isset($this->attributes['nickname'])){
60 throw new Exception("must specify a nickname attribute");
62 if(!isset($this->attributes['username'])){
63 throw new Exception("must specify a username attribute");
65 if($this->password_changeable && (! isset($this->attributes['password']) || !isset($this->password_encoding))){
66 throw new Exception("if password_changeable is set, the password attribute and password_encoding must also be specified");
70 function onAutoload($cls)
74 case 'MemcacheSchemaCache':
75 require_once(INSTALLDIR.'/plugins/LdapAuthentication/MemcacheSchemaCache.php');
80 function onEndShowPageNotice($action)
82 $name = $action->trimmed('action');
88 if($this->autoregistration) {
89 $instr = 'Have an LDAP account? Use your standard username and password.';
93 $instr = 'Have an LDAP account? Use your standard username and password.';
100 $output = common_markup_to_html($instr);
101 $action->raw($output);
106 //---interface implementation---//
108 function checkPassword($username, $password)
110 $entry = $this->ldap_get_user($username);
114 $config = $this->ldap_get_config();
115 $config['binddn']=$entry->dn();
116 $config['bindpw']=$password;
117 if($this->ldap_get_connection($config)){
125 function autoRegister($username, $nickname)
127 if(is_null($nickname)){
128 $nickname = $username;
130 $entry = $this->ldap_get_user($username,$this->attributes);
132 $registration_data = array();
133 foreach($this->attributes as $sn_attribute=>$ldap_attribute){
134 $registration_data[$sn_attribute]=$entry->getValue($ldap_attribute,'single');
136 if(isset($registration_data['email']) && !empty($registration_data['email'])){
137 $registration_data['email_confirmed']=true;
139 $registration_data['nickname'] = $nickname;
140 //set the database saved password to a random string.
141 $registration_data['password']=common_good_rand(16);
142 return User::register($registration_data);
144 //user isn't in ldap, so we cannot register him
149 function changePassword($username,$oldpassword,$newpassword)
151 if(! isset($this->attributes['password']) || !isset($this->password_encoding)){
152 //throw new Exception(_('Sorry, changing LDAP passwords is not supported at this time'));
155 $entry = $this->ldap_get_user($username);
159 $config = $this->ldap_get_config();
160 $config['binddn']=$entry->dn();
161 $config['bindpw']=$oldpassword;
162 if($ldap = $this->ldap_get_connection($config)){
163 $entry = $this->ldap_get_user($username,array(),$ldap);
165 $newCryptedPassword = $this->hashPassword($newpassword, $this->password_encoding);
166 if ($newCryptedPassword===false) {
169 if($this->password_encoding=='ad') {
170 //TODO I believe this code will work once this bug is fixed: http://pear.php.net/bugs/bug.php?id=16796
171 $oldCryptedPassword = $this->hashPassword($oldpassword, $this->password_encoding);
172 $entry->delete( array($this->attributes['password'] => $oldCryptedPassword ));
174 $entry->replace( array($this->attributes['password'] => $newCryptedPassword ), true);
175 if( Net_LDAP2::isError($entry->upate()) ) {
187 function suggestNicknameForUsername($username)
189 $entry = $this->ldap_get_user($username, $this->attributes);
191 //this really shouldn't happen
194 $nickname = $entry->getValue($this->attributes['nickname'],'single');
203 //---utility functions---//
204 function ldap_get_config(){
206 $keys = array('host','port','version','starttls','binddn','bindpw','basedn','options','filter','scope');
207 foreach($keys as $key){
208 $value = $this->$key;
210 $config[$key]=$value;
216 function ldap_get_connection($config = null){
217 if($config == null && isset($this->default_ldap)){
218 return $this->default_ldap;
221 //cannot use Net_LDAP2::connect() as StatusNet uses
222 //PEAR::setErrorHandling(PEAR_ERROR_CALLBACK, 'handleError');
223 //PEAR handling can be overridden on instance objects, so we do that.
224 $ldap = new Net_LDAP2(isset($config)?$config:$this->ldap_get_config());
225 $ldap->setErrorHandling(PEAR_ERROR_RETURN);
227 if (Net_LDAP2::isError($err)) {
228 throw new Exception('Could not connect to LDAP server: '.$err->getMessage());
230 if($config == null) $this->default_ldap=$ldap;
232 $c = common_memcache();
234 $cacheObj = new MemcacheSchemaCache(
236 'cacheKey' => common_cache_key('ldap_schema:' . crc32(serialize($config)))));
237 $ldap->registerSchemaCache($cacheObj);
243 * get an LDAP entry for a user with a given username
245 * @param string $username
246 * $param array $attributes LDAP attributes to retrieve
249 function ldap_get_user($username,$attributes=array(),$ldap=null){
251 $ldap = $this->ldap_get_connection();
253 $filter = Net_LDAP2_Filter::create($this->attributes['username'], 'equals', $username);
255 'attributes' => $attributes
257 $search = $ldap->search($this->basedn, $filter, $options);
259 if (PEAR::isError($search)) {
260 common_log(LOG_WARNING, 'Error while getting DN for user: '.$search->getMessage());
264 $searchcount = $search->count();
265 if($searchcount == 0) {
267 }else if($searchcount == 1) {
268 $entry = $search->shiftEntry();
271 common_log(LOG_WARNING, 'Found ' . $searchcount . ' ldap user with the username: ' . $username);
277 * Code originaly from the phpLDAPadmin development team
278 * http://phpldapadmin.sourceforge.net/
280 * Hashes a password and returns the hash based on the specified enc_type.
282 * @param string $passwordClear The password to hash in clear text.
283 * @param string $encodageType Standard LDAP encryption type which must be one of
284 * crypt, ext_des, md5crypt, blowfish, md5, sha, smd5, ssha, or clear.
285 * @return string The hashed password.
289 function hashPassword( $passwordClear, $encodageType )
291 $encodageType = strtolower( $encodageType );
292 switch( $encodageType ) {
294 $cryptedPassword = '{CRYPT}' . crypt($passwordClear,$this->randomSalt(2));
298 // extended des crypt. see OpenBSD crypt man page.
299 if ( ! defined( 'CRYPT_EXT_DES' ) || CRYPT_EXT_DES == 0 ) {return FALSE;} //Your system crypt library does not support extended DES encryption.
300 $cryptedPassword = '{CRYPT}' . crypt( $passwordClear, '_' . $this->randomSalt(8) );
304 if( ! defined( 'CRYPT_MD5' ) || CRYPT_MD5 == 0 ) {return FALSE;} //Your system crypt library does not support md5crypt encryption.
305 $cryptedPassword = '{CRYPT}' . crypt( $passwordClear , '$1$' . $this->randomSalt(9) );
309 if( ! defined( 'CRYPT_BLOWFISH' ) || CRYPT_BLOWFISH == 0 ) {return FALSE;} //Your system crypt library does not support blowfish encryption.
310 $cryptedPassword = '{CRYPT}' . crypt( $passwordClear , '$2a$12$' . $this->randomSalt(13) ); // hardcoded to second blowfish version and set number of rounds
314 $cryptedPassword = '{MD5}' . base64_encode( pack( 'H*' , md5( $passwordClear) ) );
318 if( function_exists('sha1') ) {
319 // use php 4.3.0+ sha1 function, if it is available.
320 $cryptedPassword = '{SHA}' . base64_encode( pack( 'H*' , sha1( $passwordClear) ) );
321 } elseif( function_exists( 'mhash' ) ) {
322 $cryptedPassword = '{SHA}' . base64_encode( mhash( MHASH_SHA1, $passwordClear) );
324 return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
329 if( function_exists( 'mhash' ) && function_exists( 'mhash_keygen_s2k' ) ) {
330 mt_srand( (double) microtime() * 1000000 );
331 $salt = mhash_keygen_s2k( MHASH_SHA1, $passwordClear, substr( pack( "h*", md5( mt_rand() ) ), 0, 8 ), 4 );
332 $cryptedPassword = "{SSHA}".base64_encode( mhash( MHASH_SHA1, $passwordClear.$salt ).$salt );
334 return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
339 if( function_exists( 'mhash' ) && function_exists( 'mhash_keygen_s2k' ) ) {
340 mt_srand( (double) microtime() * 1000000 );
341 $salt = mhash_keygen_s2k( MHASH_MD5, $passwordClear, substr( pack( "h*", md5( mt_rand() ) ), 0, 8 ), 4 );
342 $cryptedPassword = "{SMD5}".base64_encode( mhash( MHASH_MD5, $passwordClear.$salt ).$salt );
344 return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
349 $cryptedPassword = '';
350 $passwordClear = "\"" . $passwordClear . "\"";
351 $len = strlen($passwordClear);
352 for ($i = 0; $i < $len; $i++) {
353 $cryptedPassword .= "{$passwordClear{$i}}\000";
358 $cryptedPassword = $passwordClear;
361 return $cryptedPassword;
365 * Code originaly from the phpLDAPadmin development team
366 * http://phpldapadmin.sourceforge.net/
368 * Used to generate a random salt for crypt-style passwords. Salt strings are used
369 * to make pre-built hash cracking dictionaries difficult to use as the hash algorithm uses
370 * not only the user's password but also a randomly generated string. The string is
371 * stored as the first N characters of the hash for reference of hashing algorithms later.
373 * --- added 20021125 by bayu irawan <bayuir@divnet.telkom.co.id> ---
374 * --- ammended 20030625 by S C Rigler <srigler@houston.rr.com> ---
376 * @param int $length The length of the salt string to generate.
377 * @return string The generated salt string.
380 function randomSalt( $length )
382 $possible = '0123456789'.
383 'abcdefghijklmnopqrstuvwxyz'.
384 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
387 mt_srand((double)microtime() * 1000000);
389 while( strlen( $str ) < $length )
390 $str .= substr( $possible, ( rand() % strlen( $possible ) ), 1 );
395 function onPluginVersion(&$versions)
397 $versions[] = array('name' => 'LDAP Authentication',
398 'version' => STATUSNET_VERSION,
399 'author' => 'Craig Andrews',
400 'homepage' => 'http://status.net/wiki/Plugin:LdapAuthentication',
402 _m('The LDAP Authentication plugin allows for StatusNet to handle authentication through LDAP.'));