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 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 // 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 throw new Exception("must specify a host");
65 if(!isset($this->basedn)){
66 throw new Exception("must specify a basedn");
68 if(!isset($this->attributes['username'])){
69 throw new Exception("username attribute must be set.");
73 function onAutoload($cls)
77 case 'MemcacheSchemaCache':
78 require_once(INSTALLDIR.'/plugins/LdapCommon/MemcacheSchemaCache.php');
81 require_once 'Net/LDAP2.php';
83 case 'Net_LDAP2_Filter':
84 require_once 'Net/LDAP2/Filter.php';
86 case 'Net_LDAP2_Filter':
87 require_once 'Net/LDAP2/Filter.php';
89 case 'Net_LDAP2_Entry':
90 require_once 'Net/LDAP2/Entry.php';
95 function get_ldap_config(){
97 $keys = array('host','port','version','starttls','binddn','bindpw','basedn','options','filter','scope');
98 foreach($keys as $key){
101 $config[$key]=$value;
107 function get_ldap_connection($config = null){
108 if($config == null) {
109 $config = $this->ldap_config;
111 $config_id = crc32(serialize($config));
112 if(array_key_exists($config_id,self::$ldap_connections)) {
113 $ldap = self::$ldap_connections[$config_id];
115 //cannot use Net_LDAP2::connect() as StatusNet uses
116 //PEAR::setErrorHandling(PEAR_ERROR_CALLBACK, 'handleError');
117 //PEAR handling can be overridden on instance objects, so we do that.
118 $ldap = new Net_LDAP2($config);
119 $ldap->setErrorHandling(PEAR_ERROR_RETURN);
121 if (Net_LDAP2::isError($err)) {
122 // if we were called with a config, assume caller will handle
123 // incorrect username/password (LDAP_INVALID_CREDENTIALS)
124 if (isset($config) && $err->getCode() == 0x31) {
125 throw new LdapInvalidCredentialsException('Could not connect to LDAP server: '.$err->getMessage());
127 throw new Exception('Could not connect to LDAP server: '.$err->getMessage());
129 $c = common_memcache();
131 $cacheObj = new MemcacheSchemaCache(
133 'cacheKey' => common_cache_key('ldap_schema:' . $config_id)));
134 $ldap->registerSchemaCache($cacheObj);
136 self::$ldap_connections[$config_id] = $ldap;
141 function checkPassword($username, $password)
143 $entry = $this->get_user($username);
147 $config = $this->get_ldap_config();
148 $config['binddn']=$entry->dn();
149 $config['bindpw']=$password;
151 $this->get_ldap_connection($config);
152 } catch (LdapInvalidCredentialsException $e) {
159 function changePassword($username,$oldpassword,$newpassword)
161 if(! isset($this->attributes['password']) || !isset($this->password_encoding)){
162 //throw new Exception(_('Sorry, changing LDAP passwords is not supported at this time'));
165 $entry = $this->get_user($username);
169 $config = $this->get_ldap_config();
170 $config['binddn']=$entry->dn();
171 $config['bindpw']=$oldpassword;
173 $ldap = $this->get_ldap_connection($config);
175 $entry = $this->get_user($username,array(),$ldap);
177 $newCryptedPassword = $this->hashPassword($newpassword, $this->password_encoding);
178 if ($newCryptedPassword===false) {
181 if($this->password_encoding=='ad') {
182 //TODO I believe this code will work once this bug is fixed: http://pear.php.net/bugs/bug.php?id=16796
183 $oldCryptedPassword = $this->hashPassword($oldpassword, $this->password_encoding);
184 $entry->delete( array($this->attributes['password'] => $oldCryptedPassword ));
186 $entry->replace( array($this->attributes['password'] => $newCryptedPassword ), true);
187 if( Net_LDAP2::isError($entry->upate()) ) {
191 } catch (LdapInvalidCredentialsException $e) {
199 function is_dn_member_of_group($userDn, $groupDn)
201 $ldap = $this->get_ldap_connection();
202 $link = $ldap->getLink();
203 $r = @ldap_compare($link, $groupDn, $this->uniqueMember_attribute, $userDn);
206 }else if($r === false){
209 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));
215 * get an LDAP entry for a user with a given username
217 * @param string $username
218 * $param array $attributes LDAP attributes to retrieve
221 function get_user($username,$attributes=array()){
222 $ldap = $this->get_ldap_connection();
223 $filter = Net_LDAP2_Filter::create($this->attributes['username'], 'equals', $username);
225 'attributes' => $attributes
227 $search = $ldap->search(null,$filter,$options);
229 if (PEAR::isError($search)) {
230 common_log(LOG_WARNING, 'Error while getting DN for user: '.$search->getMessage());
234 if($search->count()==0){
236 }else if($search->count()==1){
237 $entry = $search->shiftEntry();
240 common_log(LOG_WARNING, 'Found ' . $search->count() . ' ldap user with the username: ' . $username);
246 * Code originaly from the phpLDAPadmin development team
247 * http://phpldapadmin.sourceforge.net/
249 * Hashes a password and returns the hash based on the specified enc_type.
251 * @param string $passwordClear The password to hash in clear text.
252 * @param string $encodageType Standard LDAP encryption type which must be one of
253 * crypt, ext_des, md5crypt, blowfish, md5, sha, smd5, ssha, or clear.
254 * @return string The hashed password.
258 function hashPassword( $passwordClear, $encodageType )
260 $encodageType = strtolower( $encodageType );
261 switch( $encodageType ) {
263 $cryptedPassword = '{CRYPT}' . crypt($passwordClear,$this->randomSalt(2));
267 // extended des crypt. see OpenBSD crypt man page.
268 if ( ! defined( 'CRYPT_EXT_DES' ) || CRYPT_EXT_DES == 0 ) {return FALSE;} //Your system crypt library does not support extended DES encryption.
269 $cryptedPassword = '{CRYPT}' . crypt( $passwordClear, '_' . $this->randomSalt(8) );
273 if( ! defined( 'CRYPT_MD5' ) || CRYPT_MD5 == 0 ) {return FALSE;} //Your system crypt library does not support md5crypt encryption.
274 $cryptedPassword = '{CRYPT}' . crypt( $passwordClear , '$1$' . $this->randomSalt(9) );
278 if( ! defined( 'CRYPT_BLOWFISH' ) || CRYPT_BLOWFISH == 0 ) {return FALSE;} //Your system crypt library does not support blowfish encryption.
279 $cryptedPassword = '{CRYPT}' . crypt( $passwordClear , '$2a$12$' . $this->randomSalt(13) ); // hardcoded to second blowfish version and set number of rounds
283 $cryptedPassword = '{MD5}' . base64_encode( pack( 'H*' , md5( $passwordClear) ) );
287 if( function_exists('sha1') ) {
288 // use php 4.3.0+ sha1 function, if it is available.
289 $cryptedPassword = '{SHA}' . base64_encode( pack( 'H*' , sha1( $passwordClear) ) );
290 } elseif( function_exists( 'mhash' ) ) {
291 $cryptedPassword = '{SHA}' . base64_encode( mhash( MHASH_SHA1, $passwordClear) );
293 return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
298 if( function_exists( 'mhash' ) && function_exists( 'mhash_keygen_s2k' ) ) {
299 mt_srand( (double) microtime() * 1000000 );
300 $salt = mhash_keygen_s2k( MHASH_SHA1, $passwordClear, substr( pack( "h*", md5( mt_rand() ) ), 0, 8 ), 4 );
301 $cryptedPassword = "{SSHA}".base64_encode( mhash( MHASH_SHA1, $passwordClear.$salt ).$salt );
303 return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
308 if( function_exists( 'mhash' ) && function_exists( 'mhash_keygen_s2k' ) ) {
309 mt_srand( (double) microtime() * 1000000 );
310 $salt = mhash_keygen_s2k( MHASH_MD5, $passwordClear, substr( pack( "h*", md5( mt_rand() ) ), 0, 8 ), 4 );
311 $cryptedPassword = "{SMD5}".base64_encode( mhash( MHASH_MD5, $passwordClear.$salt ).$salt );
313 return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
318 $cryptedPassword = '';
319 $passwordClear = "\"" . $passwordClear . "\"";
320 $len = strlen($passwordClear);
321 for ($i = 0; $i < $len; $i++) {
322 $cryptedPassword .= "{$passwordClear{$i}}\000";
327 $cryptedPassword = $passwordClear;
330 return $cryptedPassword;
334 * Code originaly from the phpLDAPadmin development team
335 * http://phpldapadmin.sourceforge.net/
337 * Used to generate a random salt for crypt-style passwords. Salt strings are used
338 * to make pre-built hash cracking dictionaries difficult to use as the hash algorithm uses
339 * not only the user's password but also a randomly generated string. The string is
340 * stored as the first N characters of the hash for reference of hashing algorithms later.
342 * --- added 20021125 by bayu irawan <bayuir@divnet.telkom.co.id> ---
343 * --- ammended 20030625 by S C Rigler <srigler@houston.rr.com> ---
345 * @param int $length The length of the salt string to generate.
346 * @return string The generated salt string.
349 function randomSalt( $length )
351 $possible = '0123456789'.
352 'abcdefghijklmnopqrstuvwxyz'.
353 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
356 mt_srand((double)microtime() * 1000000);
358 while( strlen( $str ) < $length )
359 $str .= substr( $possible, ( rand() % strlen( $possible ) ), 1 );
366 class LdapInvalidCredentialsException extends Exception