Rivnuts from Homestead,PA on 7/16/2021 9:09:26 PM:
As you no doubt know, you can make reservations at and stay overnight in selected lock houses. However, I’m not aware that you are permitted nor have I seen outdoor camping at any of the lock houses. For information, most do not have toilet facilities or water.
To confirm their rules about camping there I would suggest you contact the National Park Service. I doubt it is permitted but there is no harm in asking.