Improve 2FA

app/Core/Security/PostAuthenticationProviderInterface.php

@@ -10,6 +10,13 @@ namespace Kanboard\Core\Security;
  */
 interface PostAuthenticationProviderInterface extends AuthenticationProviderInterface
 {
+    /**
+     * Called only one time before to prompt the user for pin code
+     *
+     * @access public
+     */
+    public function beforeCode();
+
     /**
      * Set user pin-code
      *
@@ -18,6 +25,14 @@ interface PostAuthenticationProviderInterface extends AuthenticationProviderInte
      */
     public function setCode($code);
 
+    /**
+     * Generate secret if necessary
+     *
+     * @access public
+     * @return string
+     */
+    public function generateSecret();
+
     /**
      * Set secret token (fetched from user profile)
      *

app/Core/Security/Token.php

@@ -21,15 +21,7 @@ class Token extends Base
      */
     public static function getToken()
     {
-        if (function_exists('random_bytes')) {
-            return bin2hex(random_bytes(30));
-        } elseif (function_exists('openssl_random_pseudo_bytes')) {
-            return bin2hex(openssl_random_pseudo_bytes(30));
-        } elseif (ini_get('open_basedir') === '' && strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN') {
-            return hash('sha256', file_get_contents('/dev/urandom', false, null, 0, 30));
-        }
-
-        return hash('sha256', uniqid(mt_rand(), true));
+        return bin2hex(random_bytes(30));
     }
 
     /**