<?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"]
 * Note: On critical error (hack attempt), we put a log "functions_dolibarr::check_user_password_dolibarr authentication KO"
 *
 * @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') && getDolGlobalString('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);

		// Verification number of USER_LOGIN_FAILED
		$dateverificationauth = dol_time_plus_duree(dol_now(), -1, 'd');
		$userremoteip = getUserRemoteIP();
		$nbevents = 0;

		$sql = "SELECT COUNT(e.rowid) as nbevent";
		$sql .= " FROM ".MAIN_DB_PREFIX."events as e";
		$sql .= " WHERE e.type = 'USER_LOGIN_FAILED'";
		$sql .= " AND e.ip = '".$db->escape($userremoteip)."'";
		$sql .= " AND e.dateevent > '".$db->idate($dateverificationauth)."'";
		$resql = $db->query($sql);
		if ($resql) {
			$obj = $db->fetch_object($resql);
			if ($obj) {
				$nbevents = $obj->nbevent;
			}
		}

		if ($nbevents <= getDolGlobalInt("MAIN_SECURITY_MAX_NUMBER_FAILED_AUTH", 100)) {
			// 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, flagdelsessionsbefore";
			$sql .= " FROM ".$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";
			// 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";

			// Note: Test on validity is done later natively with isNotIntoValidityDateRange() by core after calling checkLoginPassEntity() that call this method

			$resql = $db->query($sql);
			if ($resql) {
				$obj = $db->fetch_object($resql);
				if ($obj) {
					$passclear = $obj->pass;
					$passcrypted = $obj->pass_crypted;
					$passtyped = $passwordtotest;

					$passok = false;

					// Check crypted password
					$cryptType = '';
					if (getDolGlobalString('DATABASE_PWD_ENCRYPTED')) {
						$cryptType = getDolGlobalString('DATABASE_PWD_ENCRYPTED');
					}

					// By default, we use default setup for encryption rule
					if (!in_array($cryptType, array('auto'))) {
						$cryptType = 'auto';
					}
					// Check encrypted password according to encryption algorithm
					if ($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 old pass in database", LOG_WARNING);
						}
					}

					// 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();
			}
		} else {
			dol_syslog("functions_dolibarr::check_user_password_dolibarr Authentication KO Too many attempts", 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("ErrorTooManyAttempts");
		}
	}
	return $login;
}