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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Plugin to enable LDAP Authentication and Authorization
*
* 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 Craig Andrews http://candrews.integralblue.com
* @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);
}
require_once INSTALLDIR.'/plugins/Authentication/AuthenticationPlugin.php';
require_once 'Net/LDAP2.php';
class LdapAuthenticationPlugin extends AuthenticationPlugin
{
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 $attributes=array();
function __construct()
{
parent::__construct();
}
//---interface implementation---//
function checkPassword($nickname, $password)
{
$ldap = $this->ldap_get_connection();
if(!$ldap){
return false;
}
$entry = $this->ldap_get_user($nickname);
if(!$entry){
return false;
}else{
$config = $this->ldap_get_config();
$config['binddn']=$entry->dn();
$config['bindpw']=$password;
if($this->ldap_get_connection($config)){
return true;
}else{
return false;
}
}
}
function autoRegister($nickname)
{
$attributes=array();
$config_attributes = array('nickname','email','fullname','homepage','location');
foreach($config_attributes as $config_attribute){
$value = common_config('ldap', $config_attribute.'_attribute');
if($value!==false){
array_push($attributes,$value);
}
}
$entry = $this->ldap_get_user($nickname,$attributes);
if($entry){
$registration_data = array();
foreach($config_attributes as $config_attribute){
$value = common_config('ldap', $config_attribute.'_attribute');
if($value!==false){
if($config_attribute=='email'){
$registration_data[$config_attribute]=common_canonical_email($entry->getValue($value,'single'));
}else if($config_attribute=='nickname'){
$registration_data[$config_attribute]=common_canonical_nickname($entry->getValue($value,'single'));
}else{
$registration_data[$config_attribute]=$entry->getValue($value,'single');
}
}
}
//set the database saved password to a random string.
$registration_data['password']=common_good_rand(16);
$user = User::register($registration_data);
return true;
}else{
//user isn't in ldap, so we cannot register him
return null;
}
}
function changePassword($nickname,$oldpassword,$newpassword)
{
//TODO implement this
throw new Exception(_('Sorry, changing LDAP passwords is not supported at this time'));
return false;
}
function canUserChangeField($nickname, $field)
{
switch($field)
{
case 'password':
case 'nickname':
case 'email':
return false;
}
}
//---utility functions---//
function ldap_get_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 $config;
}
function ldap_get_connection($config = null){
if($config == null){
$config = $this->ldap_get_config();
}
//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($err)) {
common_log(LOG_WARNING, 'Could not connect to LDAP server: '.$err->getMessage());
return false;
}
return $ldap;
}
/**
* get an LDAP entry for a user with a given username
*
* @param string $username
* $param array $attributes LDAP attributes to retrieve
* @return string DN
*/
function ldap_get_user($username,$attributes=array()){
$ldap = $this->ldap_get_connection();
$filter = Net_LDAP2_Filter::create(common_config('ldap','nickname_attribute'), 'equals', $username);
$options = array(
'scope' => 'sub',
'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;
}
}
}
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