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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Plugin to enable LDAP 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 'Net/LDAP2.php';
class LdapAuthorizationPlugin extends AuthorizationPlugin
{
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 $provider_name = null;
public $uniqueMember_attribute = null;
public $roles_to_groups = array();
public $login_group = null;
public $attributes = array();
function onInitializePlugin(){
if(!isset($this->host)){
throw new Exception("must specify a host");
}
if(!isset($this->basedn)){
throw new Exception("must specify a basedn");
}
if(!isset($this->provider_name)){
throw new Exception("provider_name must be set. Use the provider_name from the LDAP Authentication plugin.");
}
if(!isset($this->uniqueMember_attribute)){
throw new Exception("uniqueMember_attribute must be set.");
}
if(!isset($this->attributes['username'])){
throw new Exception("username attribute must be set.");
}
}
//---interface implementation---//
function loginAllowed($user) {
$user_username = new User_username();
$user_username->user_id=$user->id;
$user_username->provider_name=$this->provider_name;
if($user_username->find() && $user_username->fetch()){
$entry = $this->ldap_get_user($user_username->username);
if($entry){
if(isset($this->login_group)){
if(is_array($this->login_group)){
foreach($this->login_group as $group){
if($this->ldap_is_dn_member_of_group($entry->dn(),$group)){
return true;
}
}
}else{
if($this->ldap_is_dn_member_of_group($entry->dn(),$this->login_group)){
return true;
}
}
return null;
}else{
//if a user exists, we can assume he's allowed to login
return true;
}
}else{
return null;
}
}else{
return null;
}
}
function hasRole($profile, $name) {
$user_username = new User_username();
$user_username->user_id=$profile->id;
$user_username->provider_name=$this->provider_name;
if($user_username->find() && $user_username->fetch()){
$entry = $this->ldap_get_user($user_username->username);
if($entry){
if(isset($this->roles_to_groups[$name])){
if(is_array($this->roles_to_groups[$name])){
foreach($this->roles_to_groups[$name] as $group){
if($this->ldap_is_dn_member_of_group($entry->dn(),$group)){
return true;
}
}
}else{
if($this->ldap_is_dn_member_of_group($entry->dn(),$this->roles_to_groups[$name])){
return true;
}
}
}
}
}
return false;
}
function ldap_is_dn_member_of_group($userDn, $groupDn)
{
$ldap = $this->ldap_get_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;
}
}
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 $config;
}
//-----the below function were copied from LDAPAuthenticationPlugin. They will be moved to a utility class soon.----\\
function ldap_get_connection($config = null){
if($config == null && isset($this->default_ldap)){
return $this->default_ldap;
}
//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.
$ldap = new Net_LDAP2(isset($config)?$config:$this->ldap_get_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) && $err->getCode() == 0x31) {
return null;
}
throw new Exception('Could not connect to LDAP server: '.$err->getMessage());
return false;
}
if($config == null) $this->default_ldap=$ldap;
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=null){
if($ldap==null) {
$ldap = $this->ldap_get_connection();
}
if(! $ldap) {
throw new Exception("Could not connect to LDAP");
}
$filter = Net_LDAP2_Filter::create($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: ' . $username);
return false;
}
}
function onPluginVersion(&$versions)
{
$versions[] = array('name' => 'LDAP Authorization',
'version' => STATUSNET_VERSION,
'author' => 'Craig Andrews',
'homepage' => 'http://status.net/wiki/Plugin:LdapAuthorization',
'rawdescription' =>
_m('The LDAP Authorization plugin allows for StatusNet to handle authorization through LDAP.'));
return true;
}
}
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