<?php
/*

  This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
  Copyright (C) 2003 - 2020  Roland Gruber

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 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 General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

/**
* ldap.inc provides basic functions to connect to the OpenLDAP server.
*
* @package LDAP
* @author Roland Gruber
*/

/** Access to configuration data */
include_once(__DIR__ . "/config.inc");

/**
* Ldap manages connection to LDAP and includes several helper functions.
*
* @package LDAP
*/
class Ldap{

	/** Object of Config to access preferences */
	private $conf;

	/** Server handle */
	private $server;

	/** LDAP connection established */
	private $is_connected = false;

	/** LDAP username used for bind */
	private $username;
	/** LDAP password used for bind */
	private $password;

	/**
	* Creates a new LDAP object.
	*
	* @param object $config an object of class Config
	*/
	public function __construct($config) {
		if (is_object($config)) {
			$this->conf = $config;
		}
		else {
			return false;
		}
		return true;
	}

	/**
	 * Connects to the server using the given username and password
	 *
	 * @param string $user user name
	 * @param string $passwd password
	 * @param boolean $allowAnonymous specifies if anonymous binds are allowed
	 * @throws LAMException unable to connect
	 */
	public function connect($user, $passwd, $allowAnonymous=false) {
		// close any prior connection
		@$this->close();
		// do not allow anonymous bind
		if (!$allowAnonymous && ((!$user)||($user == "")||(!$passwd))) {
			throw new LAMException(_("Cannot connect to specified LDAP server. Please try again."));
		}
		// save password und username encrypted
		$this->encrypt_login($user, $passwd);
		$startTLS = $this->conf->getUseTLS();
		$startTLS = ($startTLS === 'yes');
		$this->server = connectToLDAP($this->conf->get_ServerURL(), $startTLS);
		if ($this->server != null) {
			// referral following
			$followReferrals = ($this->conf->getFollowReferrals() === 'true') ? 1 : 0;
			ldap_set_option($this->server,LDAP_OPT_REFERRALS, $followReferrals);
			$bind = @ldap_bind($this->server, $user, $passwd);
			if ($bind) {
				$return = ldap_errno($this->server);
				$this->is_connected = true;
				return;
			}
			// return error number
			$errorNumber = ldap_errno($this->server);
			$clientSource = empty($_SERVER['REMOTE_ADDR']) ? '' : $_SERVER['REMOTE_ADDR'];
			if (($errorNumber === False)
				|| ($errorNumber == 81)) {
				// connection failed
				logNewMessage(LOG_ERR, 'User ' . $user . ' (' . $clientSource . ') failed to log in (LDAP error: ' . getDefaultLDAPErrorString($this->server) . ').');
				throw new LAMException(_("Cannot connect to specified LDAP server. Please try again."));
			}
			elseif ($errorNumber == 49) {
				// user name/password invalid. Return to login page.
				logNewMessage(LOG_ERR, 'User ' . $user . ' (' . $clientSource . ') failed to log in (wrong password). ' . getDefaultLDAPErrorString($this->server));
				throw new LAMException(_("Wrong password/user name combination. Please try again."), getDefaultLDAPErrorString($this->server));
			}
			else {
				// other errors
				logNewMessage(LOG_ERR, 'User ' . $user . ' (' . $clientSource . ') failed to log in (LDAP error: ' . getDefaultLDAPErrorString($this->server) . ').');
				throw new LAMException(_("LDAP error, server says:"),  "($errorNumber) " . getDefaultLDAPErrorString($this->server));
			}
		}
		throw new LAMException(_("Cannot connect to specified LDAP server. Please try again."));
	}

	/** Closes connection to server */
	public function close() {
		if ($this->server != null) {
			@ldap_close($this->server);
		}
	}

	/**
	* Returns the LDAP connection handle
	*
	* @return object connection handle
	*/
	public function server() {
		if (!$this->is_connected) {
			try {
				$this->connect($this->getUserName(), $this->getPassword());
				$this->is_connected = true;
			}
			catch (LAMException $e) {
				logNewMessage(LOG_ERR, $e->getTitle() . ' ' . $e->getMessage());
			}
		}
		return $this->server;
	}

	/** Closes connection to LDAP server before serialization */
	public function __sleep() {
		$this->close();
		// define which attributes to save
		return array("conf", "username", "password");
	}

	/** Reconnects to LDAP server when deserialized */
	public function __wakeup() {
		$this->is_connected = false;
		// delete PDF files and images which are older than 15 min
		$tmpDir = dirname(__FILE__) . '/../tmp/';
		$time = time();
		$dir = @opendir($tmpDir);
		$file = @readdir($dir);
		while ($file) {
			$path = $tmpDir . $file;
			if ((substr($file, 0, 1) != '.')
				&& !is_dir($path)
				&& ($time - filemtime($path) > 900)) {
				@unlink($path);
			}
			$file = @readdir($dir);
		}
		@closedir($dir);
		// clean internal files that are older than 24 hours
		$tmpDir = dirname(__FILE__) . '/../tmp/internal/';
		$time = time();
		$dir = @opendir($tmpDir);
		$file = @readdir($dir);
		while ($file) {
			if (substr($file, -4) == '.tmp') {
				$path = $tmpDir . $file;
				if ($time - filemtime($path) > (3600 * 24)) {
					@unlink($path);
				}
			}
			$file = @readdir($dir);
		}
		@closedir($dir);
	}

	/**
	* Encrypts username and password
	*
	* @param string $username LDAP user name
	* @param string $password LDAP password
	*/
	public function encrypt_login($username, $password) {
		// encrypt username and password
		$this->username = base64_encode(lamEncrypt($username));
		$this->password = base64_encode(lamEncrypt($password));
	}

	/**
	 * Returns the LDAP user name.
	 *
	 * @return string user name
	 */
	public function getUserName() {
		return lamDecrypt(base64_decode($this->username));
	}

	/**
	 * Returns the LDAP password.
	 *
	 * @return string password
	 */
	public function getPassword() {
		return lamDecrypt(base64_decode($this->password));
	}

	/** Closes connection to LDAP server and deletes encrypted username/password */
	public function destroy() {
		$this->close();
		$this->username="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
		$this->password="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
	}


}

?>