538 lines
No EOL
17 KiB
PHP
538 lines
No EOL
17 KiB
PHP
<?php
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/**
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* abook_ldap_server.php
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*
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* Address book backend for LDAP server
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*
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* LDAP filtering code by Tim Bell
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* <bhat at users.sourceforge.net> (#539534)
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* ADS limit_scope code by Michael Brown
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* <mcb30 at users.sourceforge.net> (#1035454)
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* StartTLS code by John Lane
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* <starfry at users.sourceforge.net> (#1197703)
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*
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* @copyright © 1999-2005 The SquirrelMail Project Team
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* @license http://opensource.org/licenses/gpl-license.php GNU Public License
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* @version $Id$
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* @package squirrelmail
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* @subpackage addressbook
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*/
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/**
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* Address book backend for LDAP server
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*
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* An array with the following elements must be passed to
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* the class constructor (elements marked ? are optional)
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*
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* Main settings:
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* <pre>
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* host => LDAP server hostname/IP-address
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* base => LDAP server root (base dn). Empty string allowed.
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* ? port => LDAP server TCP port number (default: 389)
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* ? charset => LDAP server charset (default: utf-8)
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* ? name => Name for LDAP server (default "LDAP: hostname")
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* Used to tag the result data
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* ? maxrows => Maximum # of rows in search result
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* ? timeout => Timeout for LDAP operations (in seconds, default: 30)
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* Might not work for all LDAP libraries or servers.
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* ? binddn => LDAP Bind DN.
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* ? bindpw => LDAP Bind Password.
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* ? protocol => LDAP Bind protocol.
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* </pre>
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* Advanced settings:
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* <pre>
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* ? filter => Filter expression to limit ldap searches
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* ? limit_scope => Limits scope to base DN (Specific to Win2k3 ADS).
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* ? listing => Controls listing of LDAP directory.
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* ? search_tree => Controls subtree or one level search.
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* ? starttls => Controls use of StartTLS on LDAP connections
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* </pre>
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* NOTE. This class should not be used directly. Use the
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* "AddressBook" class instead.
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* @package squirrelmail
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* @subpackage addressbook
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*/
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class abook_ldap_server extends addressbook_backend {
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/**
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* @var string backend type
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*/
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var $btype = 'remote';
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/**
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* @var string backend name
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*/
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var $bname = 'ldap_server';
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/* Parameters changed by class */
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/**
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* @var string displayed name
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*/
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var $sname = 'LDAP'; /* Service name */
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/**
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* @var string LDAP server name or address or url
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*/
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var $server = '';
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/**
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* @var integer LDAP server port
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*/
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var $port = 389;
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/**
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* @var string LDAP base DN
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*/
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var $basedn = '';
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/**
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* @var string charset used for entries in LDAP server
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*/
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var $charset = 'utf-8';
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/**
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* @var object PHP LDAP link ID
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*/
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var $linkid = false;
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/**
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* @var bool True if LDAP server is bound
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*/
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var $bound = false;
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/**
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* @var integer max rows in result
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*/
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var $maxrows = 250;
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/**
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* @var string ldap filter
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* @since 1.5.1
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*/
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var $filter = '';
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/**
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* @var integer timeout of LDAP operations (in seconds)
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*/
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var $timeout = 30;
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/**
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* @var string DN to bind to (non-anonymous bind)
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* @since 1.5.0 and 1.4.3
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*/
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var $binddn = '';
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/**
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* @var string password to bind with (non-anonymous bind)
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* @since 1.5.0 and 1.4.3
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*/
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var $bindpw = '';
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/**
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* @var integer protocol used to connect to ldap server
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* @since 1.5.0 and 1.4.3
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*/
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var $protocol = '';
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/**
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* @var boolean limits scope to base dn
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* @since 1.5.1
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*/
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var $limit_scope = false;
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/**
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* @var boolean controls listing of directory
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* @since 1.5.1
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*/
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var $listing = false;
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/**
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* @var boolean controls ldap search type.
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* only first level entries are displayed if set to false
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* @since 1.5.1
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*/
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var $search_tree = true;
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/**
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* @var boolean controls use of StartTLS on ldap
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* connections. Requires php 4.2+ and protocol >= 3
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* @since 1.5.1
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*/
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var $starttls = false;
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/**
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* Constructor. Connects to database
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* @param array connection options
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*/
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function abook_ldap_server($param) {
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if(!function_exists('ldap_connect')) {
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$this->set_error(_("PHP install does not have LDAP support."));
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return;
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}
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if(is_array($param)) {
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$this->server = $param['host'];
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$this->basedn = $param['base'];
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if(!empty($param['port']))
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$this->port = $param['port'];
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if(!empty($param['charset']))
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$this->charset = strtolower($param['charset']);
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if(isset($param['maxrows']))
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$this->maxrows = $param['maxrows'];
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if(isset($param['timeout']))
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$this->timeout = $param['timeout'];
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if(isset($param['binddn']))
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$this->binddn = $param['binddn'];
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if(isset($param['bindpw']))
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$this->bindpw = $param['bindpw'];
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if(isset($param['protocol']))
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$this->protocol = (int) $param['protocol'];
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if(isset($param['filter']))
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$this->filter = trim($param['filter']);
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if(isset($param['limit_scope']))
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$this->limit_scope = (bool) $param['limit_scope'];
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if(isset($param['listing']))
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$this->listing = (bool) $param['listing'];
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if(isset($param['search_tree']))
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$this->search_tree = (bool) $param['search_tree'];
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if(isset($param['starttls']))
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$this->starttls = (bool) $param['starttls'];
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if(empty($param['name'])) {
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$this->sname = 'LDAP: ' . $param['host'];
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} else {
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$this->sname = $param['name'];
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}
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/*
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* don't open LDAP server on addressbook_init(),
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* open ldap connection only on search. Speeds up
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* addressbook_init() call.
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*/
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// $this->open(true);
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} else {
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$this->set_error('Invalid argument to constructor');
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}
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}
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/**
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* Open the LDAP server.
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* @param bool $new is it a new connection
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* @return bool
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*/
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function open($new = false) {
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$this->error = '';
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/* Connection is already open */
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if($this->linkid != false && !$new) {
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return true;
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}
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$this->linkid = @ldap_connect($this->server, $this->port);
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/**
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* check if connection was successful
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* It does not work with OpenLDAP 2.x libraries. Connect error will be
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* displayed only on ldap command that tries to make connection
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* (ldap_start_tls or ldap_bind).
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*/
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if(!$this->linkid) {
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return $this->set_error($this->ldap_error('ldap_connect failed'));
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}
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if(!empty($this->protocol)) {
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// make sure that ldap_set_option() is available before using it
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if(! function_exists('ldap_set_option') ||
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!@ldap_set_option($this->linkid, LDAP_OPT_PROTOCOL_VERSION, $this->protocol)) {
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return $this->set_error('unable to set ldap protocol number');
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}
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}
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/**
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* http://www.php.net/ldap-start-tls
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* Check if v3 or newer protocol is used,
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* check if ldap_start_tls function is available.
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* Silently ignore setting, if these requirements are not satisfied.
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* Break with error message if somebody tries to start TLS on
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* ldaps or socket connection.
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*/
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if($this->starttls &&
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!empty($this->protocol) && $this->protocol >= 3 &&
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function_exists('ldap_start_tls') ) {
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// make sure that $this->server is not ldaps:// or ldapi:// URL.
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if (preg_match("/^ldap[si]:\/\/.+/i",$this->server)) {
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return $this->set_error("you can't enable starttls on ldaps and ldapi connections.");
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}
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// try starting tls
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if (! @ldap_start_tls($this->linkid)) {
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// set error if call fails
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return $this->set_error($this->ldap_error('ldap_start_tls failed'));
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}
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}
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if(!empty($this->limit_scope) && $this->limit_scope) {
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if(empty($this->protocol) || intval($this->protocol) < 3) {
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return $this->set_error('limit_scope requires protocol >= 3');
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}
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// See http://msdn.microsoft.com/library/en-us/ldap/ldap/ldap_server_domain_scope_oid.asp
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$ctrl = array ( "oid" => "1.2.840.113556.1.4.1339", "iscritical" => TRUE );
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/*
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* Option is set only during connection.
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* It does not cause immediate errors with OpenLDAP 2.x libraries.
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*/
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if(! function_exists('ldap_set_option') ||
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!@ldap_set_option($this->linkid, LDAP_OPT_SERVER_CONTROLS, array($ctrl))) {
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return $this->set_error($this->ldap_error('limit domain scope failed'));
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}
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}
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// authenticated bind
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if(!empty($this->binddn)) {
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if(!@ldap_bind($this->linkid, $this->binddn, $this->bindpw)) {
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return $this->set_error($this->ldap_error('authenticated ldap_bind failed'));
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}
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} else {
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// anonymous bind
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if(!@ldap_bind($this->linkid)) {
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return $this->set_error($this->ldap_error('anonymous ldap_bind failed'));
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}
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}
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$this->bound = true;
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return true;
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}
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/**
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* Encode string to the charset used by this LDAP server
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* @param string string that has to be encoded
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* @return string encoded string
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*/
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function charset_encode($str) {
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global $default_charset;
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if($this->charset != $default_charset) {
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return charset_convert($default_charset,$str,$this->charset,false);
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} else {
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return $str;
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}
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}
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/**
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* Decode from charset used by this LDAP server to charset used by translation
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*
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* Uses SquirrelMail charset_decode functions
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* @param string string that has to be decoded
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* @return string decoded string
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*/
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function charset_decode($str) {
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global $default_charset;
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if ($this->charset != $default_charset) {
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return charset_convert($this->charset,$str,$default_charset,false);
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} else {
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return $str;
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}
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}
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/**
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* Sanitizes ldap search strings.
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* See rfc2254
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* @link http://www.faqs.org/rfcs/rfc2254.html
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* @since 1.5.1 and 1.4.5
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* @param string $string
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* @return string sanitized string
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*/
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function ldapspecialchars($string) {
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$sanitized=array('\\' => '\5c',
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'*' => '\2a',
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'(' => '\28',
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')' => '\29',
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"\x00" => '\00');
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return str_replace(array_keys($sanitized),array_values($sanitized),$string);
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}
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/**
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* Search LDAP server.
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*
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* Warning: You must make sure that ldap query is correctly formated and
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* sanitize use of special ldap keywords.
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* @param string $expression ldap query
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* @return array search results (false on error)
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* @since 1.5.1
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*/
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function ldap_search($expression) {
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/* Make sure connection is there */
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if(!$this->open()) {
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return false;
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}
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if ($this->search_tree) {
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// ldap_search - search subtree
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$sret = @ldap_search($this->linkid, $this->basedn, $expression,
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array('dn', 'o', 'ou', 'sn', 'givenname', 'cn', 'mail'),
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0, $this->maxrows, $this->timeout);
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} else {
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// ldap_list - search one level
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$sret = @ldap_list($this->linkid, $this->basedn, $expression,
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array('dn', 'o', 'ou', 'sn', 'givenname', 'cn', 'mail'),
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0, $this->maxrows, $this->timeout);
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}
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/* Return error if search failed */
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if(!$sret) {
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return $this->set_error($this->ldap_error('ldap_search failed'));
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}
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if(@ldap_count_entries($this->linkid, $sret) <= 0) {
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return array();
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}
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/* Get results */
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$ret = array();
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$returned_rows = 0;
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$res = @ldap_get_entries($this->linkid, $sret);
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for($i = 0 ; $i < $res['count'] ; $i++) {
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$row = $res[$i];
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/* Extract data common for all e-mail addresses
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* of an object. Use only the first name */
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$nickname = $this->charset_decode($row['dn']);
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/**
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* calculate length of basedn and remove it from nickname
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* ignore whitespaces between RDNs
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* Nicknames are shorter and still unique
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*/
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$basedn_len=strlen(preg_replace('/,\s*/',',',trim($this->basedn)));
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$nickname=substr(preg_replace('/,\s*/',',',$nickname),0,(-1 - $basedn_len));
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$fullname = $this->charset_decode($row['cn'][0]);
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if(!empty($row['ou'][0])) {
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$label = $this->charset_decode($row['ou'][0]);
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}
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else if(!empty($row['o'][0])) {
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$label = $this->charset_decode($row['o'][0]);
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} else {
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$label = '';
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}
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if(empty($row['givenname'][0])) {
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$firstname = '';
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} else {
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$firstname = $this->charset_decode($row['givenname'][0]);
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}
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if(empty($row['sn'][0])) {
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$surname = '';
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} else {
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$surname = $this->charset_decode($row['sn'][0]);
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}
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/* Add one row to result for each e-mail address */
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if(isset($row['mail']['count'])) {
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for($j = 0 ; $j < $row['mail']['count'] ; $j++) {
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array_push($ret, array('nickname' => $nickname,
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'name' => $fullname,
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'firstname' => $firstname,
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'lastname' => $surname,
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'email' => $row['mail'][$j],
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'label' => $label,
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'backend' => $this->bnum,
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'source' => &$this->sname));
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// Limit number of hits
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$returned_rows++;
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if(($returned_rows >= $this->maxrows) &&
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($this->maxrows > 0) ) {
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ldap_free_result($sret);
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return $ret;
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}
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} // for($j ...)
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} // isset($row['mail']['count'])
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}
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ldap_free_result($sret);
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return $ret;
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}
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/**
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* Get error from LDAP resource if possible
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*
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* Should get error from server using the ldap_errno() and ldap_err2str() functions
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* @param string $sError error message used when ldap error functions
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* and connection resource are unavailable
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* @return string error message
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* @since 1.5.1
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*/
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function ldap_error($sError) {
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// it is possible that function_exists() tests are not needed
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if(function_exists('ldap_err2str') &&
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function_exists('ldap_errno') &&
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is_resource($this->linkid)) {
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return ldap_err2str(ldap_errno($this->linkid));
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// return ldap_error($this->linkid);
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} else {
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return $sError;
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}
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}
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/* ========================== Public ======================== */
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/**
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* Search the LDAP server
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* @param string $expr search expression
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* @return array search results
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*/
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function search($expr) {
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/* To be replaced by advanded search expression parsing */
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if(is_array($expr)) return false;
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// don't allow wide search when listing is disabled.
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if ($expr=='*' && ! $this->listing) {
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return array();
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} elseif ($expr=='*') {
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// allow use of wildcard when listing is enabled.
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$expression = '(cn=*)';
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} else {
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/* Convert search from user's charset to the one used in ldap */
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$expr = $this->charset_encode($expr);
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/* Make sure that search does not contain ldap special chars */
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$expression = '(cn=*' . $this->ldapspecialchars($expr) . '*)';
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/* Undo sanitizing of * symbol */
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$expression = str_replace('\2a','*',$expression);
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/* TODO: implement any single character (?) matching */
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}
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/* Add search filtering */
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if ($this->filter!='')
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$expression = '(&' . $this->filter . $expression . ')';
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/* Use internal search function and return search results */
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return $this->ldap_search($expression);
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}
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/**
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* List all entries present in LDAP server
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*
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* maxrows setting might limit list of returned entries.
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* Careful with this -- it could get quite large for big sites.
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* @return array all entries in ldap server
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*/
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function list_addr() {
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if (! $this->listing)
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return array();
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/* set wide search expression */
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$expression = '(cn=*)';
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/* add filtering */
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if ($this->filter!='')
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$expression = '(&' . $this->filter . $expression .')';
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/* use internal search function and return search results */
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return $this->ldap_search($expression);
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}
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}
|
|
?>
|