gnu-social/plugins/LdapCommon/LdapCommon.php

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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Utility class of LDAP functions
*
* PHP version 5
*
* LICENCE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Plugin
* @package StatusNet
* @author Craig Andrews <candrews@integralblue.com>
* @copyright 2009 Free Software Foundation, Inc http://www.fsf.org
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
if (!defined('STATUSNET') && !defined('LACONICA')) {
exit(1);
}
// We bundle the Net/LDAP2 library...
set_include_path(get_include_path() . PATH_SEPARATOR . dirname(__FILE__) . '/extlib');
class LdapCommon
{
protected static $ldap_connections = array();
public $host=null;
public $port=null;
public $version=null;
public $starttls=null;
public $binddn=null;
public $bindpw=null;
public $basedn=null;
public $options=null;
public $filter=null;
public $scope=null;
public $uniqueMember_attribute = null;
public $attributes=array();
public $password_encoding=null;
public function __construct($config)
{
Event::addHandler('Autoload',array($this,'onAutoload'));
foreach($config as $key=>$value) {
$this->$key = $value;
}
$this->ldap_config = $this->get_ldap_config();
if(!isset($this->host)){
throw new Exception(_m("A host must be specified."));
}
if(!isset($this->basedn)){
throw new Exception(_m('"basedn" must be specified.'));
}
if(!isset($this->attributes['username'])){
throw new Exception(_m('The username attribute must be set.'));
}
}
function onAutoload($cls)
{
switch ($cls)
{
case 'MemcacheSchemaCache':
require_once(INSTALLDIR.'/plugins/LdapCommon/MemcacheSchemaCache.php');
return false;
case 'Net_LDAP2':
require_once 'Net/LDAP2.php';
return false;
case 'Net_LDAP2_Filter':
require_once 'Net/LDAP2/Filter.php';
return false;
case 'Net_LDAP2_Filter':
require_once 'Net/LDAP2/Filter.php';
return false;
case 'Net_LDAP2_Entry':
require_once 'Net/LDAP2/Entry.php';
return false;
}
}
function get_ldap_config(){
$config = array();
$keys = array('host','port','version','starttls','binddn','bindpw','basedn','options','filter','scope');
foreach($keys as $key){
$value = $this->$key;
if($value!==null){
$config[$key]=$value;
}
}
return $config;
}
function get_ldap_connection($config = null){
if($config == null) {
$config = $this->ldap_config;
}
$config_id = crc32(serialize($config));
if(array_key_exists($config_id,self::$ldap_connections)) {
$ldap = self::$ldap_connections[$config_id];
} else {
//cannot use Net_LDAP2::connect() as StatusNet uses
//PEAR::setErrorHandling(PEAR_ERROR_CALLBACK, 'handleError');
//PEAR handling can be overridden on instance objects, so we do that.
$ldap = new Net_LDAP2($config);
$ldap->setErrorHandling(PEAR_ERROR_RETURN);
$err=$ldap->bind();
if (Net_LDAP2::isError($err)) {
// if we were called with a config, assume caller will handle
// incorrect username/password (LDAP_INVALID_CREDENTIALS)
if (isset($config) && $err->getCode() == 0x31) {
throw new LdapInvalidCredentialsException('Could not connect to LDAP server: '.$err->getMessage());
}
throw new Exception('Could not connect to LDAP server: '.$err->getMessage());
}
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$c = Cache::instance();
if (!empty($c)) {
$cacheObj = new MemcacheSchemaCache(
array('c'=>$c,
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'cacheKey' => Cache::key('ldap_schema:' . $config_id)));
$ldap->registerSchemaCache($cacheObj);
}
self::$ldap_connections[$config_id] = $ldap;
}
return $ldap;
}
function checkPassword($username, $password)
{
$entry = $this->get_user($username);
if(!$entry){
return false;
}else{
if(empty($password)) {
//NET_LDAP2 will do an anonymous bind if bindpw is not set / empty string
//which causes all login attempts that involve a blank password to appear
//to succeed. Which is obviously not good.
return false;
}
$config = $this->get_ldap_config();
$config['binddn']=$entry->dn();
$config['bindpw']=$password;
try {
$this->get_ldap_connection($config);
} catch (LdapInvalidCredentialsException $e) {
return false;
}
return true;
}
}
function changePassword($username,$oldpassword,$newpassword)
{
if(! isset($this->attributes['password']) || !isset($this->password_encoding)){
//throw new Exception(_('Sorry, changing LDAP passwords is not supported at this time'));
return false;
}
$entry = $this->get_user($username);
if(!$entry){
return false;
}else{
$config = $this->get_ldap_config();
$config['binddn']=$entry->dn();
$config['bindpw']=$oldpassword;
try {
$ldap = $this->get_ldap_connection($config);
$entry = $this->get_user($username,array(),$ldap);
$newCryptedPassword = $this->hashPassword($newpassword, $this->password_encoding);
if ($newCryptedPassword===false) {
return false;
}
if($this->password_encoding=='ad') {
//TODO I believe this code will work once this bug is fixed: http://pear.php.net/bugs/bug.php?id=16796
$oldCryptedPassword = $this->hashPassword($oldpassword, $this->password_encoding);
$entry->delete( array($this->attributes['password'] => $oldCryptedPassword ));
}
$entry->replace( array($this->attributes['password'] => $newCryptedPassword ), true);
if( Net_LDAP2::isError($entry->upate()) ) {
return false;
}
return true;
} catch (LdapInvalidCredentialsException $e) {
return false;
}
}
return false;
}
function is_dn_member_of_group($userDn, $groupDn)
{
$ldap = $this->get_ldap_connection();
$link = $ldap->getLink();
$r = @ldap_compare($link, $groupDn, $this->uniqueMember_attribute, $userDn);
if ($r === true){
return true;
}else if($r === false){
return false;
}else{
common_log(LOG_ERR, "LDAP error determining if userDn=$userDn is a member of groupDn=$groupDn using uniqueMember_attribute=$this->uniqueMember_attribute error: ".ldap_error($link));
return false;
}
}
/**
* get an LDAP entry for a user with a given username
*
* @param string $username
* $param array $attributes LDAP attributes to retrieve
* @return string DN
*/
function get_user($username,$attributes=array()){
$ldap = $this->get_ldap_connection();
$filter = Net_LDAP2_Filter::create($this->attributes['username'], 'equals', $username);
$options = array(
'attributes' => $attributes
);
$search = $ldap->search(null,$filter,$options);
if (PEAR::isError($search)) {
common_log(LOG_WARNING, 'Error while getting DN for user: '.$search->getMessage());
return false;
}
if($search->count()==0){
return false;
}else if($search->count()==1){
$entry = $search->shiftEntry();
return $entry;
}else{
common_log(LOG_WARNING, 'Found ' . $search->count() . ' ldap user with the username: ' . $username);
return false;
}
}
/**
* Code originaly from the phpLDAPadmin development team
* http://phpldapadmin.sourceforge.net/
*
* Hashes a password and returns the hash based on the specified enc_type.
*
* @param string $passwordClear The password to hash in clear text.
* @param string $encodageType Standard LDAP encryption type which must be one of
* crypt, ext_des, md5crypt, blowfish, md5, sha, smd5, ssha, or clear.
* @return string The hashed password.
*
*/
function hashPassword( $passwordClear, $encodageType )
{
$encodageType = strtolower( $encodageType );
switch( $encodageType ) {
case 'crypt':
$cryptedPassword = '{CRYPT}' . crypt($passwordClear,$this->randomSalt(2));
break;
case 'ext_des':
// extended des crypt. see OpenBSD crypt man page.
if ( ! defined( 'CRYPT_EXT_DES' ) || CRYPT_EXT_DES == 0 ) {return FALSE;} //Your system crypt library does not support extended DES encryption.
$cryptedPassword = '{CRYPT}' . crypt( $passwordClear, '_' . $this->randomSalt(8) );
break;
case 'md5crypt':
if( ! defined( 'CRYPT_MD5' ) || CRYPT_MD5 == 0 ) {return FALSE;} //Your system crypt library does not support md5crypt encryption.
$cryptedPassword = '{CRYPT}' . crypt( $passwordClear , '$1$' . $this->randomSalt(9) );
break;
case 'blowfish':
if( ! defined( 'CRYPT_BLOWFISH' ) || CRYPT_BLOWFISH == 0 ) {return FALSE;} //Your system crypt library does not support blowfish encryption.
$cryptedPassword = '{CRYPT}' . crypt( $passwordClear , '$2a$12$' . $this->randomSalt(13) ); // hardcoded to second blowfish version and set number of rounds
break;
case 'md5':
$cryptedPassword = '{MD5}' . base64_encode( pack( 'H*' , md5( $passwordClear) ) );
break;
case 'sha':
if( function_exists('sha1') ) {
// use php 4.3.0+ sha1 function, if it is available.
$cryptedPassword = '{SHA}' . base64_encode( pack( 'H*' , sha1( $passwordClear) ) );
} elseif( function_exists( 'mhash' ) ) {
$cryptedPassword = '{SHA}' . base64_encode( mhash( MHASH_SHA1, $passwordClear) );
} else {
return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
}
break;
case 'ssha':
if( function_exists( 'mhash' ) && function_exists( 'mhash_keygen_s2k' ) ) {
mt_srand( (double) microtime() * 1000000 );
$salt = mhash_keygen_s2k( MHASH_SHA1, $passwordClear, substr( pack( "h*", md5( mt_rand() ) ), 0, 8 ), 4 );
$cryptedPassword = "{SSHA}".base64_encode( mhash( MHASH_SHA1, $passwordClear.$salt ).$salt );
} else {
return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
}
break;
case 'smd5':
if( function_exists( 'mhash' ) && function_exists( 'mhash_keygen_s2k' ) ) {
mt_srand( (double) microtime() * 1000000 );
$salt = mhash_keygen_s2k( MHASH_MD5, $passwordClear, substr( pack( "h*", md5( mt_rand() ) ), 0, 8 ), 4 );
$cryptedPassword = "{SMD5}".base64_encode( mhash( MHASH_MD5, $passwordClear.$salt ).$salt );
} else {
return FALSE; //Your PHP install does not have the mhash() function. Cannot do SHA hashes.
}
break;
case 'ad':
$cryptedPassword = '';
$passwordClear = "\"" . $passwordClear . "\"";
$len = strlen($passwordClear);
for ($i = 0; $i < $len; $i++) {
$cryptedPassword .= "{$passwordClear{$i}}\000";
}
case 'clear':
default:
$cryptedPassword = $passwordClear;
}
return $cryptedPassword;
}
/**
* Code originaly from the phpLDAPadmin development team
* http://phpldapadmin.sourceforge.net/
*
* Used to generate a random salt for crypt-style passwords. Salt strings are used
* to make pre-built hash cracking dictionaries difficult to use as the hash algorithm uses
* not only the user's password but also a randomly generated string. The string is
* stored as the first N characters of the hash for reference of hashing algorithms later.
*
* --- added 20021125 by bayu irawan <bayuir@divnet.telkom.co.id> ---
* --- ammended 20030625 by S C Rigler <srigler@houston.rr.com> ---
*
* @param int $length The length of the salt string to generate.
* @return string The generated salt string.
*/
function randomSalt( $length )
{
$possible = '0123456789'.
'abcdefghijklmnopqrstuvwxyz'.
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
'./';
$str = "";
mt_srand((double)microtime() * 1000000);
while( strlen( $str ) < $length )
$str .= substr( $possible, ( rand() % strlen( $possible ) ), 1 );
return $str;
}
}
class LdapInvalidCredentialsException extends Exception
{
}