180 lines
5.0 KiB
PHP
180 lines
5.0 KiB
PHP
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<?PHP
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/**
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* Login script
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*
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* @author Joshua Ramon Enslin <joshua@jrenslin.de>
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*/
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// Load settings
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// Demand HTTPS
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if (!isset($_SERVER['HTTPS']) or $_SERVER['HTTPS'] != 'on') header("Location: ../");
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// Get available login information
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$loginInformation = json_decode(file_get_contents(__DIR__ . '/../data/users.json'), True);
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define("loginLogFile", "/../data/logins.csv");
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/**
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* Function for printing the login page
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*
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* @param string $error_msg Error message to print. Optional.
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* @param string $cssFile CSS file.
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*
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* @return void
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*/
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function showLoginPasswordProtect($error_msg = "", $cssFile = "themes/default/default.css") {
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echo '<!DOCTYPE html>
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<html id="loginPage">
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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<meta http-equiv="content-type" content="text/html;charset=utf-8">
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<meta charset="UTF-8">
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<title>Log In</title>
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<link rel="stylesheet" type="text/css" href="' . $cssFile . '">
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</head>
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<body>
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<h1>Log In</h1>';
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if ($error_msg) echo '<p id="errorMsg">'.$error_msg.'</p>';
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echo '
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<form action="" method="POST">
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<input type="text" name="username" placeholder="Username" required autofocus />
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<input type="password" name="password" placeholder="Password" required />
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<button type="submit">Submit</button>
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</form>
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</body>
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</html>
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';
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die();
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}
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/**
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* Logout function: Unsets all relevant session variables.
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*
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* @return void
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*/
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function logout() {
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$loginVariables = array("username", "userlevel", "userLastLogin", "userLang");
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foreach ($loginVariables as $var) {
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if (isset($_SESSION[$var])) unset($_SESSION[$var]);
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}
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header("Location: ../");
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}
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/**
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* Function for Logging logins.
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*
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* @return void
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*/
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function logLogin() {
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file_put_contents(loginLogFile, $_SESSION['username'].'|'.date("Y-m-d H:i:s").PHP_EOL, FILE_APPEND | LOCK_EX);
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}
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/**
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* Prevent brute force attacks
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*
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* @return void
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*/
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function preventBruteForce() {
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if (!isset($_SESSION['loginattempt'])) $_SESSION['loginattempt'] = array();
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$_SESSION['loginattempt'][] = date("Y-m-d H:i:s");
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if (count($_SESSION['loginattempt']) > 3) {
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$secondtolastattempt = strtotime($_SESSION['loginattempt'][count($_SESSION['loginattempt']) - 3]);
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$lastattempt = strtotime($_SESSION['loginattempt'][count($_SESSION['loginattempt']) - 2]);
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$logindelay = (intval(count($_SESSION['loginattempt'])) * 20);
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$sincelastlogin = strtotime(date("Y-m-d H:i:s")) - $lastattempt;
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if ($sincelastlogin < $logindelay) showLoginPasswordProtect("You failed logging in too often, try again in $logindelay seconds.");
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}
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}
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/**
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* Check for validity of username / password combination.
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*
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* @param mixed[] $loginInformation Array containing all login information.
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* @param string $username Username to check.
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*
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* @return void
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*/
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function checkLoginValidity(array $loginInformation, $username) {
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if (!isset($loginInformation[$username])) showLoginPasswordProtect("Incorrect username");
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}
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// Main part of the script
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if (isset($_GET['logout'])) logout(); // Log out if so requested
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// Check for expiry
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else if (isset($_SESSION['username'])) {
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checkLoginValidity($loginInformation, $_SESSION["username"]);
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// Check for expiry of login
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if (isset($_SESSION["userLastLogin"]) and strtotime(date("Y-m-d H:i:s")) - strtotime($_SESSION["userLastLogin"]) > 3600) logout();
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// Renew last login time
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$_SESSION["userLastLogin"] = date("Y-m-d H:i:s");
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}
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// If the corresponding POST vars are set, check for
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else if (isset($_SERVER['PHP_AUTH_USER']) and isset($_SERVER['PHP_AUTH_PW'])) {
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preventBruteForce();
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checkLoginValidity($loginInformation, $_SERVER['PHP_AUTH_USER']);
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if (password_verify($loginInformation[$_SERVER['PHP_AUTH_USER']]['password'], $_SERVER['PHP_AUTH_PW'])) showLoginPasswordProtect("Incorrect password");
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// Set username
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$_SESSION["username"] = $_SERVER['PHP_AUTH_USER'];
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// Set last access time
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$_SESSION["userLastLogin"] = date("Y-m-d H:i:s");
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if (isset($_SESSION['loginattempt'])) unset($_SESSION['loginattempt']);
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// Log login time
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logLogin();
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}
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else if (isset($_POST['username']) and isset($_POST['password'])) {
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preventBruteForce();
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checkLoginValidity($loginInformation, $_POST['username']);
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if (password_verify($loginInformation[$_POST['username']]['password'], $_POST['username'])) showLoginPasswordProtect("Incorrect password");
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// Set username
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$_SESSION["username"] = $_POST['username'];
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// Set last access time
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$_SESSION["userLastLogin"] = date("Y-m-d H:i:s");
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if (isset($_SESSION['loginattempt'])) unset($_SESSION['loginattempt']);
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// Log login time
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logLogin();
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}
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// If nothing happens, offer login page
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else showLoginPasswordProtect();
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// End script
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unset($loginInformation); // Unset array containing login information
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?>
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