mirror of
https://github.com/EGroupware/egroupware.git
synced 2024-11-20 15:03:36 +01:00
301 lines
8.4 KiB
PHP
301 lines
8.4 KiB
PHP
<?php
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/**
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* EGroupware API - LDAP connection handling
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*
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* @link http://www.egroupware.org
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* @author Lars Kneschke <l.kneschke@metaways.de>
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* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
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*
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package api
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* @subpackage ldap
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* @version $Id$
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*/
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namespace EGroupware\Api;
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/**
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* LDAP connection handling
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*
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* Please note for SSL or TLS connections hostname has to be:
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* - SSL: "ldaps://host[:port]/"
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* - TLS: "tls://host[:port]/"
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* Both require certificats installed on the webserver, otherwise the connection will fail!
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*
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* If multiple (space-separated) ldap hosts or urls are given, try them in order and
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* move first successful one to first place in session, to try not working ones
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* only once per session.
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*
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* Use Api\Ldap::factory($resource=true, $host='', $dn='', $passwd='') to open only a single connection.
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*/
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class Ldap
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{
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/**
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* Holds the LDAP link identifier
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*
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* @var resource $ds
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*/
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var $ds;
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/**
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* Holds the detected information about the connected ldap server
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*
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* @var Ldap\ServerInfo $ldapserverinfo
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*/
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var $ldapserverinfo;
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/**
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* Throw Exceptions in ldapConnect instead of echoing error and returning false
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*
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* @var boolean $exception_on_error
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*/
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var $exception_on_error=false;
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/**
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* Constructor
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*
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* @param boolean $exception_on_error =false true: throw Exceptions in ldapConnect instead of echoing error and returning false
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*/
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function __construct($exception_on_error=false)
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{
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$this->exception_on_error = $exception_on_error;
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$this->restoreSessionData();
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}
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/**
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* Connections created with factory method
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*
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* @var array
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*/
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protected static $connections = array();
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/**
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* Connect to ldap server and return a handle or Api\Ldap object
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*
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* Use this factory method to open only a single connection to LDAP server!
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*
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* @param boolean $ressource =true true: return LDAP ressource for ldap_*-methods,
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* false: return connected instances of this Api\Ldap class
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* @param string $host ='' ldap host, default $GLOBALS['egw_info']['server']['ldap_host']
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* @param string $dn ='' ldap dn, default $GLOBALS['egw_info']['server']['ldap_root_dn']
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* @param string $passwd ='' ldap pw, default $GLOBALS['egw_info']['server']['ldap_root_pw']
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* @return resource|Ldap resource from ldap_connect() or false on error
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* @throws Exception\AssertingFailed 'LDAP support unavailable!' (no ldap extension)
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* @throws Exception\NoPermission if bind fails
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*/
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public static function factory($ressource=true, $host='', $dn='', $passwd='')
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{
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$key = md5($host.':'.$dn.':'.$passwd);
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if (!isset(self::$connections[$key]))
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{
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self::$connections[$key] = new Ldap(true);
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self::$connections[$key]->ldapConnect($host, $dn, $passwd);
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}
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return $ressource ? self::$connections[$key]->ds : self::$connections[$key];
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}
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/**
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* Returns information about connected ldap server
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*
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* @return Ldap\ServerInfo|null
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*/
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function getLDAPServerInfo()
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{
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return $this->ldapserverinfo;
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}
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/**
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* escapes a string for use in searchfilters meant for ldap_search.
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*
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* Escaped Characters are: '*', '(', ')', ' ', '\', NUL
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* It's actually a PHP-Bug, that we have to escape space.
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* For all other Characters, refer to RFC2254.
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*
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* @param string|array $string either a string to be escaped, or an array of values to be escaped
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* @return string
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*/
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static function quote($string)
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{
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return str_replace(array('\\','*','(',')','\0',' '),array('\\\\','\*','\(','\)','\\0','\20'),$string);
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}
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/**
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* Convert a single ldap result into a associative array
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*
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* @param array $ldap array with numerical and associative indexes and count's
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* @return boolean|array with only associative index and no count's or false on error (parm is no array)
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*/
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static function result2array($ldap)
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{
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if (!is_array($ldap)) return false;
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$arr = array();
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foreach($ldap as $var => $val)
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{
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if (is_int($var) || $var == 'count') continue;
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if (is_array($val) && $val['count'] == 1)
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{
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$arr[$var] = $val[0];
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}
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else
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{
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if (is_array($val)) unset($val['count']);
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$arr[$var] = $val;
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}
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}
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return $arr;
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}
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/**
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* Connect to ldap server and return a handle
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*
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* If multiple (space-separated) ldap hosts or urls are given, try them in order and
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* move first successful one to first place in session, to try not working ones
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* only once per session.
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*
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* @param string $host ='' ldap host, default $GLOBALS['egw_info']['server']['ldap_host']
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* @param string $dn ='' ldap dn, default $GLOBALS['egw_info']['server']['ldap_root_dn']
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* @param string $passwd ='' ldap pw, default $GLOBALS['egw_info']['server']['ldap_root_pw']
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* @return resource|boolean resource from ldap_connect() or false on error
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* @throws Exception\AssertingFailed 'LDAP support unavailable!' (no ldap extension)
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* @throws Exception\NoPermission if bind fails
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*/
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function ldapConnect($host='', $dn='', $passwd='')
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{
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if(!function_exists('ldap_connect'))
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{
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if ($this->exception_on_error) throw new Exception\AssertionFailed('LDAP support unavailable!');
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printf('<b>Error: LDAP support unavailable</b><br>',$host);
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return False;
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}
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if (empty($host))
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{
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$host = $GLOBALS['egw_info']['server']['ldap_host'];
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}
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if (empty($dn))
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{
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$dn = $GLOBALS['egw_info']['server']['ldap_root_dn'];
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$passwd = $GLOBALS['egw_info']['server']['ldap_root_pw'];
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}
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// if multiple hosts given, try them all, but only once per session!
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if (isset($_SESSION) && isset($_SESSION['ldapConnect']) && isset($_SESSION['ldapConnect'][$host]))
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{
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$host = $_SESSION['ldapConnect'][$host];
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}
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foreach($hosts=preg_split('/[ ,;]+/', $host) as $h)
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{
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if ($this->_connect($h, $dn, $passwd))
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{
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if ($h !== $host)
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{
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if (isset($_SESSION)) // store working host as first choice in session
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{
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$_SESSION['ldapConnect'][$host] = implode(' ',array_unique(array_merge(array($h),$hosts)));
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}
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}
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return $this->ds;
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}
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error_log(__METHOD__."('$h', '$dn', \$passwd) Can't connect/bind to ldap server!".
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($this->ds ? ' '.ldap_error($this->ds).' ('.ldap_errno($this->ds).')' : '').
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' '.function_backtrace());
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}
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// give visible error, only if we cant connect to any ldap server
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if ($this->exception_on_error) throw new Exception\NoPermission("Can't connect/bind to LDAP server '$host' and dn='$dn'!");
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return false;
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}
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/**
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* connect to the ldap server and return a handle
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*
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* @param string $host ldap host
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* @param string $dn ldap dn
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* @param string $passwd ldap pw
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* @return resource|boolean resource from ldap_connect() or false on error
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*/
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private function _connect($host, $dn, $passwd)
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{
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if (($use_tls = substr($host,0,6) == 'tls://'))
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{
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$port = parse_url($host,PHP_URL_PORT);
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$host = parse_url($host,PHP_URL_HOST);
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}
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// connect to ldap server (never fails, as connection happens in bind!)
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if(!$host || !($this->ds = !empty($port) ? ldap_connect($host, $port) : ldap_connect($host)))
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{
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return False;
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}
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// set network timeout to not block for minutes
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ldap_set_option($this->ds, LDAP_OPT_NETWORK_TIMEOUT, 5);
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if(ldap_set_option($this->ds, LDAP_OPT_PROTOCOL_VERSION, 3))
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{
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$supportedLDAPVersion = 3;
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}
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else
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{
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$supportedLDAPVersion = 2;
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}
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if ($use_tls) ldap_start_tls($this->ds);
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if (!isset($this->ldapserverinfo) ||
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!is_a($this->ldapserverinfo,'EGroupware\Ldap\ServerInfo') ||
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$this->ldapserverinfo->host != $host)
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{
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//error_log("no ldap server info found");
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@ldap_bind($this->ds, $GLOBALS['egw_info']['server']['ldap_root_dn'], $GLOBALS['egw_info']['server']['ldap_root_pw']);
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$this->ldapserverinfo = Ldap\ServerInfo::get($this->ds, $host, $supportedLDAPVersion);
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$this->saveSessionData();
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}
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if(!@ldap_bind($this->ds, $dn, $passwd))
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{
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return False;
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}
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return $this->ds;
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}
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/**
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* disconnect from the ldap server
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*/
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function ldapDisconnect()
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{
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if(is_resource($this->ds))
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{
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ldap_unbind($this->ds);
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unset($this->ds);
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unset($this->ldapserverinfo);
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}
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}
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/**
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* restore the session data
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*/
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function restoreSessionData()
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{
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if (isset($GLOBALS['egw']->session)) // no availible in setup
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{
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$this->ldapserverinfo = Cache::getSession(__CLASS__, 'ldapServerInfo');
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}
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}
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/**
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* save the session data
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*/
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function saveSessionData()
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{
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if (isset($GLOBALS['egw']->session)) // no availible in setup
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{
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Cache::setSession(__CLASS__, 'ldapServerInfo', $this->ldapserverinfo);
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}
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}
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}
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