Notes:
jailtest is a little utility that probes the UML security mechanisms from the inside. It is currently a quick kludge which checks only a few things. It needs to be made more thorough, modular, and extensible.
The intent is that it run in a jail or honeypot before it opens up for customers. This would provide a last-minute check that everything is OK, possibly spotting configuration errors before a nasty person does.