3 * StatusNet, the distributed open-source microblogging tool
5 * Utility class of LDAP functions
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 Free Software Foundation, Inc http://www.fsf.org
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 // We bundle the Net/LDAP2 library...
35 set_include_path(get_include_path() . PATH_SEPARATOR . dirname(__FILE__) . '/extlib');
39 protected static $ldap_connections = array();
43 public $starttls=null;
50 public $uniqueMember_attribute = null;
51 public $attributes=array();
52 public $password_encoding=null;
54 public function __construct($config)
56 Event::addHandler('Autoload',array($this,'onAutoload'));
57 foreach($config as $key=>$value) {
60 $this->ldap_config = $this->get_ldap_config();
62 if(!isset($this->host)){
63 // TRANS: Exception thrown when initialising the LDAP Common plugin fails because of an incorrect configuration.
64 throw new Exception(_m('A host must be specified.'));
66 if(!isset($this->basedn)){
67 // TRANS: Exception thrown when initialising the LDAP Common plugin fails because of an incorrect configuration.
68 throw new Exception(_m('"basedn" must be specified.'));
70 if(!isset($this->attributes['username'])){
71 // TRANS: Exception thrown when initialising the LDAP Common plugin fails because of an incorrect configuration.
72 throw new Exception(_m('The username attribute must be set.'));
76 function onAutoload($cls)
80 case 'MemcacheSchemaCache':
81 require_once(INSTALLDIR.'/plugins/LdapCommon/MemcacheSchemaCache.php');
84 require_once 'Net/LDAP2.php';
86 case 'Net_LDAP2_Filter':
87 require_once 'Net/LDAP2/Filter.php';
89 case 'Net_LDAP2_Filter':
90 require_once 'Net/LDAP2/Filter.php';
92 case 'Net_LDAP2_Entry':
93 require_once 'Net/LDAP2/Entry.php';
98 function get_ldap_config(){
100 $keys = array('host','port','version','starttls','binddn','bindpw','basedn','options','filter','scope');
101 foreach($keys as $key){
102 $value = $this->$key;
104 $config[$key]=$value;
110 function get_ldap_connection($config = null){
111 if($config == null) {
112 $config = $this->ldap_config;
114 $config_id = crc32(serialize($config));
115 if(array_key_exists($config_id,self::$ldap_connections)) {
116 $ldap = self::$ldap_connections[$config_id];
118 //cannot use Net_LDAP2::connect() as StatusNet uses
119 //PEAR::setErrorHandling(PEAR_ERROR_CALLBACK, 'handleError');
120 //PEAR handling can be overridden on instance objects, so we do that.
121 $ldap = new Net_LDAP2($config);
122 $ldap->setErrorHandling(PEAR_ERROR_RETURN);
124 if (Net_LDAP2::isError($err)) {
125 // if we were called with a config, assume caller will handle
126 // incorrect username/password (LDAP_INVALID_CREDENTIALS)
127 if (isset($config) && $err->getCode() == 0x31) {
128 // TRANS: Exception thrown in the LDAP Common plugin when LDAP server is not available.
129 // TRANS: %s is the error message.
130 throw new LdapInvalidCredentialsException(sprintf(_m('Could not connect to LDAP server: %s'),$err->getMessage()));
132 // TRANS: Exception thrown in the LDAP Common plugin when LDAP server is not available.
133 // TRANS: %s is the error message.
134 throw new Exception(sprintf(_m('Could not connect to LDAP server: %s.'),$err->getMessage()));
136 $c = Cache::instance();
138 $cacheObj = new MemcacheSchemaCache(
140 'cacheKey' => Cache::key('ldap_schema:' . $config_id)));
141 $ldap->registerSchemaCache($cacheObj);
143 self::$ldap_connections[$config_id] = $ldap;
148 function checkPassword($username, $password)
150 $entry = $this->get_user($username,array('dn' => 'dn'));
154 if(empty($password)) {
155 //NET_LDAP2 will do an anonymous bind if bindpw is not set / empty string
156 //which causes all login attempts that involve a blank password to appear
157 //to succeed. Which is obviously not good.
160 $config = $this->get_ldap_config();
161 $config['binddn']=$entry->dn();
162 $config['bindpw']=$password;
164 $this->get_ldap_connection($config);
165 } catch (LdapInvalidCredentialsException $e) {
172 function changePassword($username,$oldpassword,$newpassword)
174 if(! isset($this->attributes['password']) || !isset($this->password_encoding)){
175 //throw new Exception(_m('Sorry, changing LDAP passwords is not supported at this time.'));
178 $entry = $this->get_user($username,array('dn' => 'dn'));
182 $config = $this->get_ldap_config();
183 $config['binddn']=$entry->dn();
184 $config['bindpw']=$oldpassword;
186 $ldap = $this->get_ldap_connection($config);
188 $entry = $this->get_user($username,array(),$ldap);
190 $newCryptedPassword = $this->hashPassword($newpassword, $this->password_encoding);
191 if ($newCryptedPassword===false) {
194 if($this->password_encoding=='ad') {
195 //TODO I believe this code will work once this bug is fixed: http://pear.php.net/bugs/bug.php?id=16796
196 $oldCryptedPassword = $this->hashPassword($oldpassword, $this->password_encoding);
197 $entry->delete( array($this->attributes['password'] => $oldCryptedPassword ));
199 $entry->replace( array($this->attributes['password'] => $newCryptedPassword ), true);
200 if( Net_LDAP2::isError($entry->upate()) ) {
204 } catch (LdapInvalidCredentialsException $e) {
212 function is_dn_member_of_group($userDn, $groupDn)
214 $ldap = $this->get_ldap_connection();
215 $link = $ldap->getLink();
216 $r = @ldap_compare($link, $groupDn, $this->uniqueMember_attribute, $userDn);
219 }else if($r === false){
222 common_log(LOG_ERR, "LDAP error determining if userDn=$userDn is a member of groupDn=$groupDn using uniqueMember_attribute=$this->uniqueMember_attribute error: ".ldap_error($link));
228 * get an LDAP entry for a user with a given username
230 * @param string $username
231 * $param array $attributes LDAP attributes to retrieve
234 function get_user($username,$attributes=array()){
235 $ldap = $this->get_ldap_connection();
236 $filter = Net_LDAP2_Filter::create($this->attributes['username'], 'equals', $username);
238 'attributes' => $attributes
240 $search = $ldap->search(null,$filter,$options);
242 if (PEAR::isError($search)) {
243 common_log(LOG_WARNING, 'Error while getting DN for user: '.$search->getMessage());
247 if($search->count()==0){
249 }else if($search->count()==1){
250 $entry = $search->shiftEntry();
253 common_log(LOG_WARNING, 'Found ' . $search->count() . ' ldap user with the username: ' . $username);
259 * Code originaly from the phpLDAPadmin development team
260 * http://phpldapadmin.sourceforge.net/
262 * Hashes a password and returns the hash based on the specified enc_type.
264 * @param string $passwordClear The password to hash in clear text.
265 * @param string $encodageType Standard LDAP encryption type which must be one of
266 * crypt, ext_des, md5crypt, blowfish, md5, sha, smd5, ssha, or clear.
267 * @return string The hashed password.
270 function hashPassword( $passwordClear, $encodageType )
272 $encodageType = strtolower( $encodageType );
273 switch( $encodageType ) {
275 $cryptedPassword = '{CRYPT}' . crypt($passwordClear,$this->randomSalt(2));
279 // extended des crypt. see OpenBSD crypt man page.
280 if ( ! defined( 'CRYPT_EXT_DES' ) || CRYPT_EXT_DES == 0 ) {return FALSE;} //Your system crypt library does not support extended DES encryption.
281 $cryptedPassword = '{CRYPT}' . crypt( $passwordClear, '_' . $this->randomSalt(8) );
285 if( ! defined( 'CRYPT_MD5' ) || CRYPT_MD5 == 0 ) {return FALSE;} //Your system crypt library does not support md5crypt encryption.
286 $cryptedPassword = '{CRYPT}' . crypt( $passwordClear , '$1$' . $this->randomSalt(9) );
290 if( ! defined( 'CRYPT_BLOWFISH' ) || CRYPT_BLOWFISH == 0 ) {return FALSE;} //Your system crypt library does not support blowfish encryption.
291 $cryptedPassword = '{CRYPT}' . crypt( $passwordClear , '$2a$12$' . $this->randomSalt(13) ); // hardcoded to second blowfish version and set number of rounds
295 $cryptedPassword = '{MD5}' . base64_encode( pack( 'H*' , md5( $passwordClear) ) );
299 if( function_exists('sha1') ) {
300 // use php 4.3.0+ sha1 function, if it is available.
301 $cryptedPassword = '{SHA}' . base64_encode( pack( 'H*' , sha1( $passwordClear) ) );
302 } elseif( function_exists( 'mhash' ) ) {
303 $cryptedPassword = '{SHA}' . base64_encode( mhash( MHASH_SHA1, $passwordClear) );
305 return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
310 if( function_exists( 'mhash' ) && function_exists( 'mhash_keygen_s2k' ) ) {
311 mt_srand( (double) microtime() * 1000000 );
312 $salt = mhash_keygen_s2k( MHASH_SHA1, $passwordClear, substr( pack( "h*", md5( mt_rand() ) ), 0, 8 ), 4 );
313 $cryptedPassword = "{SSHA}".base64_encode( mhash( MHASH_SHA1, $passwordClear.$salt ).$salt );
315 return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
320 if( function_exists( 'mhash' ) && function_exists( 'mhash_keygen_s2k' ) ) {
321 mt_srand( (double) microtime() * 1000000 );
322 $salt = mhash_keygen_s2k( MHASH_MD5, $passwordClear, substr( pack( "h*", md5( mt_rand() ) ), 0, 8 ), 4 );
323 $cryptedPassword = "{SMD5}".base64_encode( mhash( MHASH_MD5, $passwordClear.$salt ).$salt );
325 return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
330 $cryptedPassword = '';
331 $passwordClear = "\"" . $passwordClear . "\"";
332 $len = strlen($passwordClear);
333 for ($i = 0; $i < $len; $i++) {
334 $cryptedPassword .= "{$passwordClear{$i}}\000";
339 $cryptedPassword = $passwordClear;
342 return $cryptedPassword;
346 * Code originaly from the phpLDAPadmin development team
347 * http://phpldapadmin.sourceforge.net/
349 * Used to generate a random salt for crypt-style passwords. Salt strings are used
350 * to make pre-built hash cracking dictionaries difficult to use as the hash algorithm uses
351 * not only the user's password but also a randomly generated string. The string is
352 * stored as the first N characters of the hash for reference of hashing algorithms later.
354 * --- added 20021125 by bayu irawan <bayuir@divnet.telkom.co.id> ---
355 * --- ammended 20030625 by S C Rigler <srigler@houston.rr.com> ---
357 * @param int $length The length of the salt string to generate.
358 * @return string The generated salt string.
360 function randomSalt( $length )
362 $possible = '0123456789'.
363 'abcdefghijklmnopqrstuvwxyz'.
364 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
367 mt_srand((double)microtime() * 1000000);
369 while( strlen( $str ) < $length )
370 $str .= substr( $possible, ( rand() % strlen( $possible ) ), 1 );
376 class LdapInvalidCredentialsException extends Exception