<?php
/**
 *
 * SugarCRM Community Edition is a customer relationship management program developed by
 * SugarCRM, Inc. Copyright (C) 2004-2013 SugarCRM Inc.
 *
 * SuiteCRM is an extension to SugarCRM Community Edition developed by SalesAgility Ltd.
 * Copyright (C) 2011 - 2018 SalesAgility Ltd.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License version 3 as published by the
 * Free Software Foundation with the addition of the following permission added
 * to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED WORK
 * IN WHICH THE COPYRIGHT IS OWNED BY SUGARCRM, SUGARCRM DISCLAIMS THE WARRANTY
 * OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
 *
 * 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 Affero General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Affero General Public License along with
 * this program; if not, see http://www.gnu.org/licenses or write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 *
 * You can contact SugarCRM, Inc. headquarters at 10050 North Wolfe Road,
 * SW2-130, Cupertino, CA 95014, USA. or at email address contact@sugarcrm.com.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "Powered by
 * SugarCRM" logo and "Supercharged by SuiteCRM" logo. If the display of the logos is not
 * reasonably feasible for technical reasons, the Appropriate Legal Notices must
 * display the words "Powered by SugarCRM" and "Supercharged by SuiteCRM".
 */

if (!defined('sugarEntry') || !sugarEntry) {
    die('Not A Valid Entry Point');
}

/**
 * This file is used to control the authentication process.
 * It will call on the user authenticate and controll redirection
 * based on the users validation
 *
 */
class SugarAuthenticate
{
    public $userAuthenticateClass = 'SugarAuthenticateUser';
    public $authenticationDir = 'SugarAuthenticate';


    /**
     * @var SugarAuthenticateUser
     */
    public $userAuthenticate;

    /**
     * Constructs SugarAuthenticate
     * This will load the user authentication class
     *
     * @return SugarAuthenticate
     */
    public function __construct()
    {
        // check in custom dir first, in case someone want's to override an auth controller

        if (file_exists('custom/modules/Users/authentication/'.$this->authenticationDir.'/' . $this->userAuthenticateClass . '.php')) {
            require_once('custom/modules/Users/authentication/'.$this->authenticationDir.'/' . $this->userAuthenticateClass . '.php');
        } elseif (file_exists('modules/Users/authentication/'.$this->authenticationDir.'/' . $this->userAuthenticateClass . '.php')) {
            require_once('modules/Users/authentication/'.$this->authenticationDir.'/' . $this->userAuthenticateClass . '.php');
        }

        $this->userAuthenticate = new $this->userAuthenticateClass();
    }



    /**
     * Authenticates a user based on the username and password
     * returns true if the user was authenticated false otherwise
     * it also will load the user into current user if they were authenticated
     *
     * @param string $username
     * @param string $password
     * @return boolean
     */
    public function loginAuthenticate($username, $password, $fallback=false, $PARAMS = array())
    {
        global $mod_strings;
        unset($_SESSION['login_error']);
        $usr= new user();
        $usr_id=$usr->retrieve_user_id($username);
        $usr->retrieve($usr_id);
        $_SESSION['login_error']='';
        $_SESSION['waiting_error']='';
        $_SESSION['hasExpiredPassword']='0';
        if ($this->userAuthenticate->loadUserOnLogin($username, $password, $fallback, $PARAMS)) {
            require_once('modules/Users/password_utils.php');
            if (hasPasswordExpired($username)) {
                $_SESSION['hasExpiredPassword'] = '1';
            }
            // now that user is authenticated, reset loginfailed
            if ($usr->getPreference('loginfailed') != '' && $usr->getPreference('loginfailed') != 0) {
                $usr->setPreference('loginfailed', '0');
                $usr->savePreferencesToDB();
            }
            return $this->postLoginAuthenticate();
        } else {
            //if(!empty($usr_id) && $res['lockoutexpiration'] > 0){
            if (!empty($usr_id)) {
                if (($logout=$usr->getPreference('loginfailed'))=='') {
                    $usr->setPreference('loginfailed', '1');
                } else {
                    $usr->setPreference('loginfailed', $logout+1);
                }
                $usr->savePreferencesToDB();
            }
        }
        if (strtolower(get_class($this)) != 'sugarauthenticate') {
            $sa = new SugarAuthenticate();
            $error = (!empty($_SESSION['login_error']))?$_SESSION['login_error']:'';
            if ($sa->loginAuthenticate($username, $password, true, $PARAMS)) {
                return true;
            }
            $_SESSION['login_error'] = $error;
        }


        $_SESSION['login_user_name'] = $username;
        $_SESSION['login_password'] = $password;
        if (empty($_SESSION['login_error'])) {
            $_SESSION['login_error'] = translate('ERR_INVALID_PASSWORD', 'Users');
        }

        return false;
    }

    /**
     * Once a user is authenticated on login this function will be called. Populate the session with what is needed and log anything that needs to be logged
     *
     */
    public function postLoginAuthenticate()
    {
        global $reset_language_on_default_user, $sugar_config;
        
        //just do a little house cleaning here
        unset($_SESSION['login_password']);
        unset($_SESSION['login_error']);
        unset($_SESSION['login_user_name']);
        unset($_SESSION['ACL']);

        //set the server unique key
        if (isset($sugar_config['unique_key'])) {
            $_SESSION['unique_key'] = $sugar_config['unique_key'];
        }

        //set user language
        if (isset($reset_language_on_default_user) && $reset_language_on_default_user && $GLOBALS['current_user']->user_name == $sugar_config['default_user_name']) {
            $authenticated_user_language = $sugar_config['default_language'];
        } else {
            $authenticated_user_language = isset($_REQUEST['login_language']) ? $_REQUEST['login_language'] : (isset($_REQUEST['ck_login_language_20']) ? $_REQUEST['ck_login_language_20'] : $sugar_config['default_language']);
        }

        $_SESSION['authenticated_user_language'] = $authenticated_user_language;

        $GLOBALS['log']->debug("authenticated_user_language is $authenticated_user_language");

        // Clear all uploaded import files for this user if it exists
        require_once('modules/Import/ImportCacheFiles.php');
        $tmp_file_name = ImportCacheFiles::getImportDir()."/IMPORT_" . $GLOBALS['current_user']->id;

        if (file_exists($tmp_file_name)) {
            unlink($tmp_file_name);
        }

        return true;
    }

    /**
     * On every page hit this will be called to ensure a user is authenticated
     * @return boolean
     */
    public function sessionAuthenticate()
    {
        global $module, $action, $allowed_actions;
        $authenticated = false;
        $allowed_actions = array("Authenticate", "Login"); // these are actions where the user/server keys aren't compared
        if (isset($_SESSION['authenticated_user_id'])) {
            $GLOBALS['log']->debug("We have an authenticated user id: ".$_SESSION["authenticated_user_id"]);

            $authenticated = $this->postSessionAuthenticate();
        } else {
            if (isset($action) && isset($module) && $action == "Authenticate" && $module == "Users") {
                $GLOBALS['log']->debug("We are authenticating user now");
            } else {
                $GLOBALS['log']->debug("The current user does not have a session.  Going to the login page");
                $action = "Login";
                $module = "Users";
                $_REQUEST['action'] = $action;
                $_REQUEST['module'] = $module;
            }
        }
        if (empty($GLOBALS['current_user']->id) && !in_array($action, $allowed_actions)) {
            $GLOBALS['log']->debug("The current user is not logged in going to login page");
            $action = "Login";
            $module = "Users";
            $_REQUEST['action'] = $action;
            $_REQUEST['module'] = $module;
        }

        if ($authenticated && ((empty($_REQUEST['module']) || empty($_REQUEST['action'])) || ($_REQUEST['module'] != 'Users' || $_REQUEST['action'] != 'Logout'))) {
            $this->validateIP();
        }
        return $authenticated;
    }




    /**
     * Called after a session is authenticated - if this returns false the sessionAuthenticate will return false and destroy the session
     * and it will load the  current user
     * @return boolean
     */
    public function postSessionAuthenticate()
    {
        global $action, $allowed_actions, $sugar_config, $app_strings;
        $_SESSION['userTime']['last'] = time();
        $user_unique_key = (isset($_SESSION['unique_key'])) ? $_SESSION['unique_key'] : '';
        $server_unique_key = (isset($sugar_config['unique_key'])) ? $sugar_config['unique_key'] : '';

        //CHECK IF USER IS CROSSING SITES
        if (($user_unique_key != $server_unique_key) && (!in_array($action, $allowed_actions)) && (!isset($_SESSION['login_error']))) {
            $GLOBALS['log']->debug('Destroying Session User has crossed Sites');
            session_destroy();
            header("Location: index.php?action=Login&module=Users" . $GLOBALS['app']->getLoginRedirect());
            sugar_cleanup(true);
        }
        if (!$this->userAuthenticate->loadUserOnSession($_SESSION['authenticated_user_id'])) {
            session_destroy();
            header("Location: index.php?action=Login&module=Users&loginErrorMessage=LBL_SESSION_EXPIRED");
            $GLOBALS['log']->debug('Current user session does not exist redirecting to login');
            sugar_cleanup(true);
        }

        $GLOBALS['log']->debug('FACTOR AUTH: -------------------------------------------------------------');
        $GLOBALS['log']->debug('FACTOR AUTH: --------------------- CHECK FACTOR AUtH ---------------------');
        $GLOBALS['log']->debug('FACTOR AUTH: -------------------------------------------------------------');

        //session_destroy(); die();

        if (!$this->userAuthenticate->isUserLogoutRequest()) {
            $GLOBALS['log']->debug('FACTOR AUTH: User needs factor auth, request is not Logout');

            if ($this->userAuthenticate->isUserNeedFactorAuthentication()) {
                $GLOBALS['log']->debug('FACTOR AUTH: User needs factor auth, set on User Profile page');

                if (!$this->userAuthenticate->isUserFactorAuthenticated()) {
                    $GLOBALS['log']->debug('FACTOR AUTH: User is not factor authenticated yet');

                    if ($this->userAuthenticate->isUserFactorTokenReceived()) {
                        $GLOBALS['log']->debug('FACTOR AUTH: User sent back a token in request');

                        if (!$this->userAuthenticate->factorAuthenticateCheck()) {
                            $GLOBALS['log']->debug('FACTOR AUTH: User factor auth failed so we show token input form');

                            $msg = $app_strings['ERR_TWO_FACTOR_FAILED'];
                            self::addFactorMessage($msg);
                            $this->userAuthenticate->showFactorTokenInput();
                        } else {
                            $GLOBALS['log']->debug('FACTOR AUTH: User factor auth success!');
                        }
                    } else {
                        $GLOBALS['log']->debug('FACTOR AUTH: User did not sent back the token so we send a new one and redirect to token input form');

                        if (
                            $this->userAuthenticate->isFactorTokenSent()
                            && $this->userAuthenticate->isUserRequestedResendToken() === false
                        ) {
                            $GLOBALS['log']->fatal('DEBUG: token is not sent yet, do we send a token to user');
                            $this->userAuthenticate->showFactorTokenInput();
                        } else {
                            $GLOBALS['log']->fatal('DEBUG: token already sent');
                        }

                        if ($this->userAuthenticate->sendFactorTokenToUser()) {
                            $GLOBALS['log']->debug('FACTOR AUTH: Factor Token sent to User');

                            $msg = $app_strings['ERR_TWO_FACTOR_CODE_SENT'];
                            self::addFactorMessage($msg);

                            $this->userAuthenticate->showFactorTokenInput();
                        } else {
                            $GLOBALS['log']->debug('FACTOR AUTH: failed to send factor token to user so just redirect to the logout url and kick off ');

                            $msg = $app_strings['ERR_TWO_FACTOR_CODE_FAILED'];
                            self::addFactorMessage($msg);

                            $this->userAuthenticate->redirectToLogout();
                        }
                    }
                } else {
                    $GLOBALS['log']->debug('FACTOR AUTH: User factor authenticated already');
                }
            } else {
                $GLOBALS['log']->debug('FACTOR AUTH: User does`nt need factor auth');
            }
        } else {
            $GLOBALS['log']->debug('FACTOR AUTH: User Logout requested');
        }


        $GLOBALS['log']->debug('Current user is: ' . $GLOBALS['current_user']->user_name);

        return true;
    }

    /**
     * Store message in a session array
     * @param $msg
     */
    public static function addFactorMessage($msg)
    {
        if (!isset($_SESSION['factor_message'])) {
            $_SESSION['factor_message'] = array();
        }
        if (!in_array($msg, $_SESSION['factor_message'])) {
            $_SESSION['factor_message'][] = $msg;
        }
    }

    /**
     * Read back the session messages and clear it;
     * @return bool|string
     * @throws \RuntimeException
     */
    public static function getFactorMessages($sep = '<br>')
    {
        $factorMessage = false;
        if (isset($_SESSION['factor_message']) && $_SESSION['factor_message']) {
            if (is_array($_SESSION['factor_message']) || is_object($_SESSION['factor_message'])) {
                $factorMessage = implode($sep, $_SESSION['factor_message']);
            } elseif (is_string($_SESSION['factor_message'])) {
                $factorMessage = $_SESSION['factor_message'];
            } else {
                $msg = 'Incorrect login factor message type.';
                $GLOBALS['log']->warn($msg);
                throw new RuntimeException($msg);
            }
            unset($_SESSION['factor_message']);
        }
        return $factorMessage;
    }

    /**
     * Make sure a user isn't stealing sessions so check the ip to ensure that the ip address hasn't dramatically changed
     *
     */
    public function validateIP()
    {
        global $sugar_config;
        // grab client ip address
        $clientIP = query_client_ip();
        $classCheck = 0;
        // check to see if config entry is present, if not, verify client ip
        if (!isset($sugar_config['verify_client_ip']) || $sugar_config['verify_client_ip'] == true) {
            // check to see if we've got a current ip address in $_SESSION
            // and check to see if the session has been hijacked by a foreign ip
            if (isset($_SESSION["ipaddress"])) {
                $session_parts = explode(".", $_SESSION["ipaddress"]);
                $client_parts = explode(".", $clientIP);
                if (count($session_parts) < 4) {
                    $classCheck = 0;
                } else {
                    // match class C IP addresses
                    for ($i = 0; $i < 3; $i ++) {
                        if ($session_parts[$i] == $client_parts[$i]) {
                            $classCheck = 1;
                            continue;
                        } else {
                            $classCheck = 0;
                            break;
                        }
                    }
                }
                // we have a different IP address
                if ($_SESSION["ipaddress"] != $clientIP && empty($classCheck)) {
                    $GLOBALS['log']->fatal("IP Address mismatch: SESSION IP: {$_SESSION['ipaddress']} CLIENT IP: {$clientIP}");
                    session_destroy();
                    die($mod_strings['ERR_IP_CHANGE'] . "<a href=\"{$sugar_config['site_url']}\">" . $mod_strings['ERR_RETURN'] . "</a>");
                }
            } else {
                $_SESSION["ipaddress"] = $clientIP;
            }
        }
    }




    /**
     * Called when a user requests to logout
     *
     */
    public function logout()
    {
        session_start();
        session_destroy();
        ob_clean();
        header('Location: index.php?module=Users&action=Login');
        sugar_cleanup(true);
    }


    /**
     * Encodes a users password. This is a static function and can be called at any time.
     *
     * @param STRING $password
     * @return STRING $encoded_password
     */
    public static function encodePassword($password)
    {
        return strtolower(md5($password));
    }

    /**
     * If a user may change there password through the Sugar UI
     *
     */
    public function canChangePassword()
    {
        return true;
    }
    /**
     * If a user may change there user name through the Sugar UI
     *
     */
    public function canChangeUserName()
    {
        return true;
    }


    /**
     * pre_login
     *
     * This function allows the SugarAuthenticate subclasses to perform some pre login initialization as needed
     */
    public function pre_login()
    {
        if (isset($_SESSION['authenticated_user_id'])) {
            ob_clean();
            // fixing bug #46837: Previosly links/URLs to records in Sugar from MSO Excel/Word were referred to the home screen and not the record
            // It used to appear when default browser was not MS IE
            header("Location: ".$GLOBALS['app']->getLoginRedirect());
            sugar_cleanup(true);
        }
    }

    /**
     * Redirect to login page
     *
     * @param SugarApplication $app
     */
    public function redirectToLogin(SugarApplication $app)
    {
        $loginVars = $app->createLoginVars();
        SugarApplication::redirect('index.php?action=Login&module=Users' . $loginVars);
    }
}
