controllers/ResetPassword.php

@@ -37,6 +37,24 @@ class ResetPassword extends HTMLController
 				return;
 			}
 
+			if (Authentication::getResetTimeOut($user->getUserId()) > 0)
+			{
+				// Update the reset time-out to prevent hammering
+				$resetTimeOut = Authentication::updateResetTimeOut($user->getUserId());
+
+				// Present it to the user in a readable way
+				if ($resetTimeOut > 3600)
+					$timeOut = sprintf('%d hours', ceil($resetTimeOut / 3600));
+				elseif ($resetTimeOut > 60)
+					$timeOut = sprintf('%d minutes', ceil($resetTimeOut / 60));
+				else
+					$timeOut = sprintf('%d seconds', $resetTimeOut);
+
+				$form->adopt(new Alert('Password reset token already sent', 'We already sent a password reset token to this email address recently. ' .
+					'If no email was received, please wait ' . $timeOut . ' to try again.', 'error'));
+				return;
+			}
+
 			Authentication::setResetKey($user->getUserId());
 			Email::resetMail($user->getUserId());
 
@@ -76,6 +94,10 @@ class ResetPassword extends HTMLController
 			if (empty($missing))
 			{
 				Authentication::updatePassword($user->getUserId(), Authentication::computeHash($_POST['password1']));
+
+				// Consume token, ensuring it isn't used again
+				Authentication::consumeResetKey($user->getUserId());
+
 				$_SESSION['login_msg'] = ['Your password has been reset', 'You can now use the form below to log in to your account.', 'success'];
 				header('Location: ' . BASEURL . '/login/');
 				exit;

migrations/2024-11-05.sql

@@ -0,0 +1,2 @@
+/* Add time-out to password reset keys, and prevent repeated mails */
+ALTER TABLE `users` ADD `reset_blocked_until` INT  UNSIGNED  NULL  AFTER `reset_key`;

models/Authentication.php

@@ -12,6 +12,8 @@
  */
 class Authentication
 {
+	const DEFAULT_RESET_TIMEOUT = 30;
+
 	/**
 	 * Checks a password for a given username against the database.
 	 */
@@ -57,6 +59,27 @@ class Authentication
 		return $hash;
 	}
 
+	public static function consumeResetKey($id_user)
+	{
+		return Registry::get('db')->query('
+			UPDATE users
+			SET reset_key = NULL,
+				reset_blocked_until = NULL
+			WHERE id_user = {int:id_user}',
+			['id_user' => $id_user]);
+	}
+
+	public static function getResetTimeOut($id_user)
+	{
+		$resetTime = Registry::get('db')->queryValue('
+			SELECT reset_blocked_until
+			FROM users
+			WHERE id_user = {int:id_user}',
+			['id_user' => $id_user]);
+
+		return max(0, $resetTime - time());
+	}
+
 	/**
 	 * Verifies whether the user is currently logged in.
 	 */
@@ -92,7 +115,8 @@ class Authentication
 	{
 		return Registry::get('db')->query('
 			UPDATE users
-			SET reset_key = {string:key}
+			SET reset_key = {string:key},
+				reset_blocked_until = UNIX_TIMESTAMP() + ' . static::DEFAULT_RESET_TIMEOUT . '
 			WHERE id_user = {int:id}',
 			[
 				'id' => $id_user,
@@ -117,4 +141,26 @@ class Authentication
 				'blank' => '',
 			]);
 	}
+
+	public static function updateResetTimeOut($id_user)
+	{
+		$currentResetTimeOut = static::getResetTimeOut($id_user);
+
+		// New timeout: between 30 seconds, double the current timeout, and a full day
+		$newResetTimeOut = min(max(static::DEFAULT_RESET_TIMEOUT, $currentResetTimeOut * 2), 60 * 60 * 24);
+
+		$success = Registry::get('db')->query('
+			UPDATE users
+			SET reset_blocked_until = {int:new_time_out}
+			WHERE id_user = {int:id_user}',
+			[
+				'id_user' => $id_user,
+				'new_time_out' => time() + $newResetTimeOut,
+			]);
+
+		if (!$success)
+			throw new UnexpectedValueException('Could not set password reset timeout!');
+
+		return $newResetTimeOut;
+	}
 }

models/User.php

@@ -23,6 +23,7 @@ abstract class User
 	protected $ip_address;
 	protected $is_admin;
 	protected $reset_key;
+	protected $reset_blocked_until;
 
 	protected bool $is_logged;
 	protected bool $is_guest;