egroupware/phpgwapi/inc/class.ldap.inc.php

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<?php
/**
* API - LDAP connection handling
*
* @link http://www.egroupware.org
* @author Lars Kneschke <l.kneschke@metaways.de>
* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
*
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package api
* @subpackage ldap
* @version $Id$
*/
/**
* LDAP connection handling
*
* Please note for SSL or TLS connections hostname has to be:
* - SSL: "ldaps://host"
* - TLS: "tls://host"
* Both require certificats installed on the webserver, otherwise the connection will fail!
*/
class ldap
{
/**
* @var resource $ds holds the LDAP link identifier
*/
var $ds;
/**
* @var array $ldapServerInfo holds the detected information about the different ldap servers
*/
var $ldapServerInfo;
/**
* the constructor for this class
*/
function __construct()
{
$this->restoreSessionData();
}
/**
* escapes a string for use in searchfilters meant for ldap_search.
*
* Escaped Characters are: '*', '(', ')', ' ', '\', NUL
* It's actually a PHP-Bug, that we have to escape space.
* For all other Characters, refer to RFC2254.
* @param $string either a string to be escaped, or an array of values to be escaped
* @return ldapserverinfo|boolean
*/
function getLDAPServerInfo($_host)
{
if(is_a($this->ldapServerInfo[$_host], 'ldapserverinfo'))
{
return $this->ldapServerInfo[$_host];
}
return false;
}
/**
* escapes a string for use in searchfilters meant for ldap_search.
*
* Escaped Characters are: '*', '(', ')', ' ', '\', NUL
* It's actually a PHP-Bug, that we have to escape space.
* For all other Characters, refer to RFC2254.
*
* @param string|array $string either a string to be escaped, or an array of values to be escaped
* @return string
*/
static function quote($string)
{
return str_replace(array('\\','*','(',')','\0',' '),array('\\\\','\*','\(','\)','\\0','\20'),$string);
}
/**
* connect to the ldap server and return a handle
*
* @param $host ldap host
* @param $dn ldap dn
* @param $passwd ldap pw
* @return resource|boolean resource from ldap_connect() or false on error
*/
function ldapConnect($host='', $dn='', $passwd='')
{
if(!function_exists('ldap_connect'))
{
/* log does not exist in setup(, yet) */
if(isset($GLOBALS['egw']->log))
{
$GLOBALS['egw']->log->message('F-Abort, LDAP support unavailable');
$GLOBALS['egw']->log->commit();
}
printf('<b>Error: LDAP support unavailable</b><br>',$host);
return False;
}
if(!$host)
{
$host = $GLOBALS['egw_info']['server']['ldap_host'];
}
if(!$dn)
{
$dn = $GLOBALS['egw_info']['server']['ldap_root_dn'];
}
if(!$passwd)
{
$passwd = $GLOBALS['egw_info']['server']['ldap_root_pw'];
}
if (($use_tls = substr($host,0,6) == 'tls://'))
{
$host = parse_url($host,PHP_URL_HOST);
}
// connects to ldap server
if(!$this->ds = ldap_connect($host))
{
/* log does not exist in setup(, yet) */
if(isset($GLOBALS['egw']->log))
{
$GLOBALS['egw']->log->message('F-Abort, Failed connecting to LDAP server');
$GLOBALS['egw']->log->commit();
}
printf("<b>Error: Can't connect to LDAP server %s!</b><br>",$host);
echo function_backtrace(1);
return False;
}
if(ldap_set_option($this->ds, LDAP_OPT_PROTOCOL_VERSION, 3))
{
$supportedLDAPVersion = 3;
}
else
{
$supportedLDAPVersion = 2;
}
if ($use_tls) ldap_start_tls($this->ds);
if(!isset($this->ldapServerInfo[$host]))
{
//error_log("no ldap server info found");
$ldapbind = @ldap_bind($this->ds, $GLOBALS['egw_info']['server']['ldap_root_dn'], $GLOBALS['egw_info']['server']['ldap_root_pw']);
$filter='(objectclass=*)';
$justthese = array('structuralObjectClass','namingContexts','supportedLDAPVersion','subschemaSubentry');
if(($sr = @ldap_read($this->ds, '', $filter, $justthese)))
{
if($info = ldap_get_entries($this->ds, $sr))
{
$ldapServerInfo = new ldapserverinfo();
$ldapServerInfo->setVersion($supportedLDAPVersion);
// check for naming contexts
if($info[0]['namingcontexts'])
{
for($i=0; $i<$info[0]['namingcontexts']['count']; $i++)
{
$namingcontexts[] = $info[0]['namingcontexts'][$i];
}
$ldapServerInfo->setNamingContexts($namingcontexts);
}
// check for ldap server type
if($info[0]['structuralobjectclass'])
{
switch($info[0]['structuralobjectclass'][0])
{
case 'OpenLDAProotDSE':
$ldapServerType = OPENLDAP_LDAPSERVER;
break;
default:
$ldapServerType = UNKNOWN_LDAPSERVER;
break;
}
$ldapServerInfo->setServerType($ldapServerType);
}
// check for subschema entry dn
if($info[0]['subschemasubentry'])
{
$subschemasubentry = $info[0]['subschemasubentry'][0];
$ldapServerInfo->setSubSchemaEntry($subschemasubentry);
}
// create list of supported objetclasses
if(!empty($subschemasubentry))
{
$filter='(objectclass=*)';
$justthese = array('objectClasses');
if($sr=ldap_read($this->ds, $subschemasubentry, $filter, $justthese))
{
if($info = ldap_get_entries($this->ds, $sr))
{
if($info[0]['objectclasses']) {
for($i=0; $i<$info[0]['objectclasses']['count']; $i++)
{
$pattern = '/^\( (.*) NAME \'(\w*)\' /';
if(preg_match($pattern, $info[0]['objectclasses'][$i], $matches))
{
#_debug_array($matches);
if(count($matches) == 3)
{
$supportedObjectClasses[$matches[1]] = strtolower($matches[2]);
}
}
}
$ldapServerInfo->setSupportedObjectClasses($supportedObjectClasses);
}
}
}
}
$this->ldapServerInfo[$host] = $ldapServerInfo;
}
}
else
{
$this->ldapServerInfo[$host] = false;
}
$this->saveSessionData();
}
else
{
$ldapServerInfo = $this->ldapServerInfo[$host];
}
if(!@ldap_bind($this->ds, $dn, $passwd))
{
if(isset($GLOBALS['egw']->log))
{
$GLOBALS['egw']->log->message('F-Abort, Failed binding to LDAP server');
$GLOBALS['egw']->log->commit();
}
printf("<b>Error: Can't bind to LDAP server: %s!</b> %s<br />",$dn,function_backtrace(1));
return False;
}
return $this->ds;
}
/**
* disconnect from the ldap server
*/
function ldapDisconnect()
{
if(is_resource($this->ds))
{
ldap_unbind($this->ds);
}
}
/**
* restore the session data
*/
function restoreSessionData()
{
if (isset($GLOBALS['egw']->session)) // no availible in setup
{
$this->ldapServerInfo = (array) unserialize($GLOBALS['egw']->session->appsession('ldapServerInfo'));
}
}
/**
* save the session data
*/
function saveSessionData()
{
if (isset($GLOBALS['egw']->session)) // no availible in setup
{
$GLOBALS['egw']->session->appsession('ldapServerInfo','',serialize($this->ldapServerInfo));
}
}
}