'.$error_msg.'
'; echo ' '; die(); } /** * Logout function: Unsets all relevant session variables. * * @return void */ function logout() { $loginVariables = array("username", "userlevel", "userLastLogin", "userLang"); foreach ($loginVariables as $var) { if (isset($_SESSION[$var])) unset($_SESSION[$var]); } header("Location: ../"); } /** * Function for Logging logins. * * @return void */ function logLogin() { file_put_contents(loginLogFile, $_SESSION['username'].'|'.date("Y-m-d H:i:s").PHP_EOL, FILE_APPEND | LOCK_EX); } /** * Prevent brute force attacks * * @return void */ function preventBruteForce() { if (!isset($_SESSION['loginattempt'])) $_SESSION['loginattempt'] = array(); $_SESSION['loginattempt'][] = date("Y-m-d H:i:s"); if (count($_SESSION['loginattempt']) > 3) { $secondtolastattempt = strtotime($_SESSION['loginattempt'][count($_SESSION['loginattempt']) - 3]); $lastattempt = strtotime($_SESSION['loginattempt'][count($_SESSION['loginattempt']) - 2]); $logindelay = (intval(count($_SESSION['loginattempt'])) * 20); $sincelastlogin = strtotime(date("Y-m-d H:i:s")) - $lastattempt; if ($sincelastlogin < $logindelay) showLoginPasswordProtect("You failed logging in too often, try again in $logindelay seconds."); } } /** * Check for validity of username / password combination. * * @param mixed[] $loginInformation Array containing all login information. * @param string $username Username to check. * * @return void */ function checkLoginValidity(array $loginInformation, $username) { if (!isset($loginInformation[$username])) showLoginPasswordProtect("Incorrect username"); } // Main part of the script if (isset($_GET['logout'])) logout(); // Log out if so requested // Check for expiry else if (isset($_SESSION['username'])) { checkLoginValidity($loginInformation, $_SESSION["username"]); // Check for expiry of login if (isset($_SESSION["userLastLogin"]) and strtotime(date("Y-m-d H:i:s")) - strtotime($_SESSION["userLastLogin"]) > 3600) logout(); // Renew last login time $_SESSION["userLastLogin"] = date("Y-m-d H:i:s"); } // If the corresponding POST vars are set, check for else if (isset($_SERVER['PHP_AUTH_USER']) and isset($_SERVER['PHP_AUTH_PW'])) { preventBruteForce(); checkLoginValidity($loginInformation, $_SERVER['PHP_AUTH_USER']); if (password_verify($loginInformation[$_SERVER['PHP_AUTH_USER']]['password'], $_SERVER['PHP_AUTH_PW'])) showLoginPasswordProtect("Incorrect password"); // Set username $_SESSION["username"] = $_SERVER['PHP_AUTH_USER']; // Set last access time $_SESSION["userLastLogin"] = date("Y-m-d H:i:s"); if (isset($_SESSION['loginattempt'])) unset($_SESSION['loginattempt']); // Log login time logLogin(); } else if (isset($_POST['username']) and isset($_POST['password'])) { preventBruteForce(); checkLoginValidity($loginInformation, $_POST['username']); if (password_verify($loginInformation[$_POST['username']]['password'], $_POST['username'])) showLoginPasswordProtect("Incorrect password"); // Set username $_SESSION["username"] = $_POST['username']; // Set last access time $_SESSION["userLastLogin"] = date("Y-m-d H:i:s"); if (isset($_SESSION['loginattempt'])) unset($_SESSION['loginattempt']); // Log login time logLogin(); } // If nothing happens, offer login page else showLoginPasswordProtect(); // End script unset($loginInformation); // Unset array containing login information ?>