<?php
/* Copyright (C) 2007-2015 Laurent Destailleur  <eldy@users.sourceforge.net>
 * Copyright (C) 2007-2015 Regis Houssin        <regis.houssin@inodbox.com>
 * Copyright (C) 2010-2011 Juanjo Menent		<jmenent@2byte.es>
 * Copyright (C) 2022      Harry Winner Kamdem  <harry@sense.africa>
 *
 * 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 3 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, see <https://www.gnu.org/licenses/>.
 */

/**
 *      \file       htdocs/core/login/functions_dolibarr.php
 *      \ingroup    core
 *      \brief      Authentication functions for Dolibarr mode (check user on login or email and check pass)
 */


/**
 * Check validity of user/password/entity
 * If test is ko, reason must be filled into $_SESSION["dol_loginmesg"]
 *
 * @param	string	$usertotest		Login
 * @param	string	$passwordtotest	Password
 * @param   int		$entitytotest   Number of instance (always 1 if module multicompany not enabled)
 * @return	string					Login if OK, '' if KO
 */
function check_user_password_dolibarr($usertotest, $passwordtotest, $entitytotest = 1)
{
	global $db, $conf, $langs;

	// Force master entity in transversal mode
	$entity = $entitytotest;
	if (isModEnabled('multicompany') && !empty($conf->global->MULTICOMPANY_TRANSVERSE_MODE)) {
		$entity = 1;
	}

	$login = '';

	if (!empty($usertotest)) {
		require_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
		dol_syslog("functions_dolibarr::check_user_password_dolibarr usertotest=".$usertotest." passwordtotest=".preg_replace('/./', '*', $passwordtotest)." entitytotest=".$entitytotest);

		// If test username/password asked, we define $test=false if ko and $login var to login if ok, set also $_SESSION["dol_loginmesg"] if ko
		$table = MAIN_DB_PREFIX."user";
		$usernamecol1 = 'login';
		$usernamecol2 = 'email';
		$entitycol = 'entity';

		$sql = "SELECT rowid, login, entity, pass, pass_crypted, datestartvalidity, dateendvalidity";
		$sql .= " FROM ".$table;
		$sql .= " WHERE (".$usernamecol1." = '".$db->escape($usertotest)."'";
		if (preg_match('/@/', $usertotest)) {
			$sql .= " OR ".$usernamecol2." = '".$db->escape($usertotest)."'";
		}
		$sql .= ") AND ".$entitycol." IN (0,".($entity ? ((int) $entity) : 1).")";
		$sql .= " AND statut = 1";
		// Note: Test on validity is done later
		// Order is required to firstly found the user into entity, then the superadmin.
		// For the case (TODO: we must avoid that) a user has renamed its login with same value than a user in entity 0.
		$sql .= " ORDER BY entity DESC";

		$resql = $db->query($sql);
		if ($resql) {
			$obj = $db->fetch_object($resql);
			if ($obj) {
				$now = dol_now();
				if ($obj->datestartvalidity && $db->jdate($obj->datestartvalidity) > $now) {
					// Load translation files required by the page
					$langs->loadLangs(array('main', 'errors'));
					$_SESSION["dol_loginmesg"] = $langs->transnoentitiesnoconv("ErrorLoginDateValidity");
					return '--bad-login-validity--';
				}
				if ($obj->dateendvalidity && $db->jdate($obj->dateendvalidity) < dol_get_first_hour($now)) {
					// Load translation files required by the page
					$langs->loadLangs(array('main', 'errors'));
					$_SESSION["dol_loginmesg"] = $langs->transnoentitiesnoconv("ErrorLoginDateValidity");
					return '--bad-login-validity--';
				}

				$passclear = $obj->pass;
				$passcrypted = $obj->pass_crypted;
				$passtyped = $passwordtotest;

				$passok = false;

				// Check crypted password
				$cryptType = '';
				if (!empty($conf->global->DATABASE_PWD_ENCRYPTED)) {
					$cryptType = $conf->global->DATABASE_PWD_ENCRYPTED;
				}

				// By default, we use default setup for encryption rule
				if (!in_array($cryptType, array('auto'))) {
					$cryptType = 'auto';
				}
				// Check crypted password according to crypt algorithm
				if ($cryptType == 'auto') {
					if ($passcrypted && dol_verifyHash($passtyped, $passcrypted, '0')) {
						$passok = true;
						dol_syslog("functions_dolibarr::check_user_password_dolibarr Authentification ok - hash ".$cryptType." of pass is ok");
					}
				}

				// For compatibility with very old versions
				if (!$passok) {
					if ((!$passcrypted || $passtyped)
						&& ($passclear && ($passtyped == $passclear))) {
						$passok = true;
						dol_syslog("functions_dolibarr::check_user_password_dolibarr Authentification ok - found pass in database");
					}
				}

				// Password ok ?
				if ($passok) {
					$login = $obj->login;
				} else {
					dol_syslog("functions_dolibarr::check_user_password_dolibarr Authentication KO bad password for '".$usertotest."', cryptType=".$cryptType, LOG_NOTICE);
					sleep(1); // Anti brut force protection. Must be same delay when login is not valid

					// Load translation files required by the page
					$langs->loadLangs(array('main', 'errors'));

					$_SESSION["dol_loginmesg"] = $langs->transnoentitiesnoconv("ErrorBadLoginPassword");
				}

				// We must check entity
				if ($passok && isModEnabled('multicompany')) {	// We must check entity
					global $mc;

					if (!isset($mc)) {
						!isModEnabled('multicompany'); // Global not available, disable $conf->multicompany->enabled for safety
					} else {
						$ret = $mc->checkRight($obj->rowid, $entitytotest);
						if ($ret < 0) {
							dol_syslog("functions_dolibarr::check_user_password_dolibarr Authentication KO entity '".$entitytotest."' not allowed for user '".$obj->rowid."'", LOG_NOTICE);

							$login = ''; // force authentication failure
							if ($mc->db->lasterror()) {
								$_SESSION["dol_loginmesg"] = $mc->db->lasterror();
							}
						}
					}
				}
			} else {
				dol_syslog("functions_dolibarr::check_user_password_dolibarr Authentication KO user not found for '".$usertotest."'", LOG_NOTICE);
				sleep(1);	// Anti brut force protection. Must be same delay when password is not valid

				// Load translation files required by the page
				$langs->loadLangs(array('main', 'errors'));

				$_SESSION["dol_loginmesg"] = $langs->transnoentitiesnoconv("ErrorBadLoginPassword");
			}
		} else {
			dol_syslog("functions_dolibarr::check_user_password_dolibarr Authentication KO db error for '".$usertotest."' error=".$db->lasterror(), LOG_ERR);
			sleep(1);
			$_SESSION["dol_loginmesg"] = $db->lasterror();
		}
	}

	return $login;
}