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<?php

/**
* @version		$Id: ldap.php 14401 2010-01-26 14:10:00Z louis $
* @package		Joomla.Framework
* @subpackage	Client
* @copyright	Copyright (C) 2005 - 2010 Open Source Matters. All rights reserved.
* @license		GNU/GPL, see LICENSE.php
* Joomla! is free software and parts of it may contain or be derived from the
* GNU General Public License or other free or open source software licenses.
* See COPYRIGHT.php for copyright notices and details.
*/

/**
 * LDAP client class
 *
 * @package		Joomla.Framework
 * @subpackage	Client
 * @since		1.5
 */

// no direct access
defined('_JEXEC') or die('Restricted access');

class JLDAP extends JObject
{
	/** @var string Hostname of LDAP server
		@access public */
	var $host = null;
	/** @var bool Authorization Method to use
		@access public */
	var $auth_method = null;
	/** @var int Port of LDAP server
		@access public */
	var $port = null;
	/** @var string Base DN (e.g. o=MyDir)
		@access public */
	var $base_dn = null;
	/** @var string User DN (e.g. cn=Users,o=MyDir)
		@access public */
	var $users_dn = null;
	/** @var string Search String
		@access public */
	var $search_string = null;
	/** @var boolean Use LDAP Version 3
		@access public */
	var $use_ldapV3 = null;
	/** @var boolean No referrals (server transfers)
		@access public */
	var $no_referrals = null;
	/** @var boolean Negotiate TLS (encrypted communications)
		@access public */
	var $negotiate_tls = null;

	/** @var string Username to connect to server
		@access public */
	var $username = null;
	/** @var string Password to connect to server
		@access public */
	var $password = null;

	/** @var mixed LDAP Resource Identifier
		@access private */
	var $_resource = null;
	/** @var string Current DN
		@access private */
	var $_dn = null;

	/**
	 * Constructor
	 *
	 * @param object An object of configuration variables
	 * @access public
	 */
	function __construct($configObj = null)
	{
		if (is_object($configObj))
		{
			$vars = get_class_vars(get_class($this));
			foreach (array_keys($vars) as $var)
			{
				if (substr($var, 0, 1) != '_') {
					if ($param = $configObj->get($var)) {
						$this-> $var = $param;
					}
				}
			}
		}
	}

	/**
	 * Connect to server
	 * @return boolean True if successful
	 * @access public
	 */
	function connect()
	{
		if ($this->host == '') {
			return false;
		}
		$this->_resource = @ ldap_connect($this->host, $this->port);
		if ($this->_resource)
		{
			if ($this->use_ldapV3) {
				if (!@ldap_set_option($this->_resource, LDAP_OPT_PROTOCOL_VERSION, 3)) {
					return false;
				}
			}
			if (!@ldap_set_option($this->_resource, LDAP_OPT_REFERRALS, intval($this->no_referrals))) {
				return false;
			}
			if ($this->negotiate_tls) {
				if (!@ldap_start_tls($this->_resource)) {
					return false;
				}
			}
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Close the connection
	 * @access public
	 */
	function close() {
		@ ldap_close($this->_resource);
	}

	/**
	 * Sets the DN with some template replacements
	 *
	 * @param string The username
	 * @access public
	 */
	function setDN($username,$nosub = 0)
	{
		if ($this->users_dn == '' || $nosub) {
			$this->_dn = $username;
		} else if(strlen($username)) {
			$this->_dn = str_replace('[username]', $username, $this->users_dn);
		} else {
			$this->_dn = '';
		}
	}

	/**
	 * @return string The current dn
	 * @access public
	 */
	function getDN() {
		return $this->_dn;
	}

	/**
	 * Anonymously Binds to LDAP Directory
	 */
	function anonymous_bind()
	{
		$bindResult = @ldap_bind($this->_resource);
		return $bindResult;
	}

	/**
	 * Binds to the LDAP directory
	 *
	 * @param string The username
	 * @param string The password
	 * @return boolean Result
	 * @access public
	 */
	function bind($username = null, $password = null, $nosub = 0)
	{
		if (is_null($username)) {
			$username = $this->username;
		}
		if (is_null($password)) {
			$password = $this->password;
		}
		$this->setDN($username,$nosub);
		//if(strlen($this->getDN()))
		$bindResult = @ldap_bind($this->_resource, $this->getDN(), $password);
		return $bindResult;
	}

	/**
	 * Perform an LDAP search using comma seperated search strings
	 *
	 * @param string search string of search values
	 */
	function simple_search($search)
	{
		$results = explode(';', $search);
		foreach($results as $key=>$result) {
			$results[$key] = '('.$result.')';
		}
		return $this->search($results);
	}


	/**
	 * Perform an LDAP search
	 *
	 * @param array Search Filters (array of strings)
	 * @param string DN Override
	 * @return array Multidimensional array of results
	 * @access public
	 */
	function search($filters, $dnoverride = null)
	{
		$attributes = array ();
		if ($dnoverride) {
			$dn = $dnoverride;
		} else {
			$dn = $this->base_dn;
		}

		$resource = $this->_resource;

		foreach ($filters as $search_filter)
		{
			$search_result = @ldap_search($resource, $dn, $search_filter);
			if ($search_result && ($count = @ldap_count_entries($resource, $search_result)) > 0)
			{
				for ($i = 0; $i < $count; $i++)
				{
					$attributes[$i] = Array ();
					if (!$i) {
						$firstentry = @ldap_first_entry($resource, $search_result);
					} else {
						$firstentry = @ldap_next_entry($resource, $firstentry);
					}
					$attributes_array = @ldap_get_attributes($resource, $firstentry); // load user-specified attributes
					// ldap returns an array of arrays, fit this into attributes result array
					foreach ($attributes_array as $ki => $ai)
					{
						if (is_array($ai))
						{
							$subcount = $ai['count'];
							$attributes[$i][$ki] = Array ();
							for ($k = 0; $k < $subcount; $k++) {
								$attributes[$i][$ki][$k] = $ai[$k];
							}
						}
					}
					$attributes[$i]['dn'] = @ldap_get_dn($resource, $firstentry);
				}
			}
		}
		return $attributes;
	}

	/**
	 * Replace an entry and return a true or false result
	 *
	 * @param string dn The DN which contains the attribute you want to replace
	 * @param string attribute The attribute values you want to replace
	 * @return mixed result of comparison (true, false, -1 on error)
	 */

	function replace($dn, $attribute) {
		return @ldap_mod_replace($this->_resource, $dn, $attribute);
	}


	/**
	 * Modifies an entry and return a true or false result
	 *
	 * @param string dn The DN which contains the attribute you want to modify
	 * @param string attribute The attribute values you want to modify
	 * @return mixed result of comparison (true, false, -1 on error)
	 */
	function modify($dn, $attribute) {
		return @ldap_modify($this->_resource, $dn, $attribute);
	}

	/**
	 * Removes attribute value from given dn and return a true or false result
	 *
	 * @param string dn The DN which contains the attribute you want to remove
	 * @param string attribute The attribute values you want to remove
	 * @return mixed result of comparison (true, false, -1 on error)
	 */
	function remove($dn, $attribute)
	{
		$resource = $this->_resource;
		return @ldap_mod_del($resource, $dn, $attribute);
	}

	/**
	 * Compare an entry and return a true or false result
	 *
	 * @param string dn The DN which contains the attribute you want to compare
	 * @param string attribute The attribute whose value you want to compare
	 * @param string value The value you want to check against the LDAP attribute
	 * @return mixed result of comparison (true, false, -1 on error)
	 * @access public
	 */
	function compare($dn, $attribute, $value) {
		return @ldap_compare($this->_resource, $dn, $attribute, $value);
	}

	/**
	 * Read all or specified attributes of given dn
	 *
	 * @param string dn The DN of the object you want to read
	 * @param string attribute The attribute values you want to read (Optional)
	 * @return array of attributes or -1 on error
	 * @access public
	 */
	function read($dn, $attribute = array())
	{
		$base = substr($dn,strpos($dn,',')+1);
		$cn = substr($dn,0,strpos($dn,','));
		$result = @ldap_read($this->_resource, $base, $cn);

		if ($result) {
			return @ldap_get_entries($this->_resource, $result);
		} else {
			return $result;
		}
	}

	/**
	 * Deletes a given DN from the tree
	 *
	 * @param string dn The DN of the object you want to delete
	 * @return bool result of operation
	 * @access public
	 */
	function delete($dn) {
		return @ldap_delete($this->_resource, $dn);
	}

	/**
	 * Create a new DN
	 *
	 * @param string dn The DN where you want to put the object
	 * @param array entries An array of arrays describing the object to add
	 * @return bool result of operation
	 */
	function create($dn, $entries) {
		return @ldap_add($this->_resource, $dn, $entries);
	}

	/**
	 * Add an attribute to the given DN
	 * Note: DN has to exist already
	 *
	 * @param string dn The DN of the entry to add the attribute
	 * @param array entry An array of arrays with attributes to add
	 * @return bool Result of operation
	 */
	function add($dn, $entry) {
		return @ldap_mod_add($this->_resource, $dn, $entry);
	}

	/**
	 * Rename the entry
	 *
	 * @param string dn The DN of the entry at the moment
	 * @param string newdn The DN of the entry should be (only cn=newvalue)
	 * @param string newparent The full DN of the parent (null by default)
	 * @param bool deleteolddn Delete the old values (default)
	 * @return bool Result of operation
	 */
	function rename($dn, $newdn, $newparent, $deleteolddn) {
		return @ldap_rename($this->_resource, $dn, $newdn, $newparent, $deleteolddn);
	}

	/**
	 * Returns the error message
	 *
	 * @return string error message
	 */
	function getErrorMsg() {
		return @ldap_error($this->_resource);
	}

	/**
	 * Converts a dot notation IP address to net address (e.g. for Netware, etc)
	 *
	 * @param string IP Address (e.g. xxx.xxx.xxx.xxx)
	 * @return string Net address
	 * @access public
	 */
	function ipToNetAddress($ip)
	{
		$parts = explode('.', $ip);
		$address = '1#';

		foreach ($parts as $int) {
			$tmp = dechex($int);
			if (strlen($tmp) != 2) {
				$tmp = '0' . $tmp;
			}
			$address .= '\\' . $tmp;
		}
		return $address;
	}

	/**
	 * extract readable network address from the LDAP encoded networkAddress attribute.
	 * @author Jay Burrell, Systems & Networks, Mississippi State University
	 * Please keep this document block and author attribution in place.
	 *
	 *  Novell Docs, see: http://developer.novell.com/ndk/doc/ndslib/schm_enu/data/sdk5624.html#sdk5624
	 *  for Address types: http://developer.novell.com/ndk/doc/ndslib/index.html?page=/ndk/doc/ndslib/schm_enu/data/sdk4170.html
	 *  LDAP Format, String:
	 *	 taggedData = uint32String "#" octetstring
	 *	 byte 0 = uint32String = Address Type: 0= IPX Address; 1 = IP Address
	 *	 byte 1 = char = "#" - separator
	 *	 byte 2+ = octetstring - the ordinal value of the address
	 *   Note: with eDirectory 8.6.2, the IP address (type 1) returns
	 *				 correctly, however, an IPX address does not seem to.  eDir 8.7 may correct this.
	 *  Enhancement made by Merijn van de Schoot:
	 *	 If addresstype is 8 (UDP) or 9 (TCP) do some additional parsing like still returning the IP address
	 */
	function LDAPNetAddr($networkaddress)
	{
		$addr = "";
		$addrtype = intval(substr($networkaddress, 0, 1));
		$networkaddress = substr($networkaddress, 2); // throw away bytes 0 and 1 which should be the addrtype and the "#" separator

		if (($addrtype == 8) || ($addrtype = 9)) {
			// TODO 1.6: If UDP or TCP, (TODO fill addrport and) strip portnumber information from address
			$networkaddress = substr($networkaddress, (strlen($networkaddress)-4));
		}

		$addrtypes = array (
			'IPX',
			'IP',
			'SDLC',
			'Token Ring',
			'OSI',
			'AppleTalk',
			'NetBEUI',
			'Socket',
			'UDP',
			'TCP',
			'UDP6',
			'TCP6',
			'Reserved (12)',
			'URL',
			'Count'
		);
		$len = strlen($networkaddress);
		if ($len > 0)
		{
			for ($i = 0; $i < $len; $i += 1)
			{
				$byte = substr($networkaddress, $i, 1);
				$addr .= ord($byte);
				if ( ($addrtype == 1) || ($addrtype == 8) || ($addrtype = 9) ) { // dot separate IP addresses...
					$addr .= ".";
				}
			}
			if ( ($addrtype == 1) || ($addrtype == 8) || ($addrtype = 9) ) { // strip last period from end of $addr
				$addr = substr($addr, 0, strlen($addr) - 1);
			}
		} else {
			$addr .= "address not available.";
		}
		return Array('protocol'=>$addrtypes[$addrtype], 'address'=>$addr);
	}

	/**
	 * Generates a LDAP compatible password
	 *
	 * @param string password Clear text password to encrypt
	 * @param string type Type of password hash, either md5 or SHA
	 * @return string encrypted password
	 */
	function generatePassword($password, $type='md5') {
		$userpassword = '';
		switch(strtolower($type)) {
			case 'sha':
				$userpassword = '{SHA}' . base64_encode( pack( 'H*', sha1( $password ) ) );
			case 'md5':
			default:
				$userpassword = '{MD5}' . base64_encode( pack( 'H*', md5( $password ) ) );
				break;
		}
		return $userpassword;
	}
}

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