Very simple plugin which blocks the crafting of a recipe if the user doesn't have permission for that recipe!
Permissions are simple, to allow a user to craft a recipe simple give them a permission like one of the following:
The last bit is the important part, it must match the EXACT Material name as found in the CraftBukkit API. Alternatively, if you'd prefer to block specific recipes instead of allowing specific recipes you can do the following:
This would give permission to craft everything except a furnace.
Sorry for the poor description and stuff, if you have issues drop me a line and I can explain better