Check current password before changing

plugins/functions/fmod_pam_authentication.py

@@ -23,11 +23,14 @@ class PamAuthentication(service.FunctionObject) :
 	def change_password(self, login, old_password, new_password):
 		if len(new_password) == 0:
 			return False
+
+		if not self.authenticate(login, old_password):
+			return False
+
 		try:
 			change_password(login, new_password, service=PAM_SERVICE_NAME)
 			return True
 		except PAMError as err:
-			print(err)
 			return False