This is a simple plugin that can block block placement or breaking based on permissions. To install it, simply drag and drop to your plugins folder. There is no configuration needed. Simply deny permissions or add permissions as needed to block whatever you want.

Permissions:

blockblock.break.* - Gives permission to break every block.
blockblock.break.[blockname] - Gives permission to break a specific block.
e.g. A player with the permission blockblock.break.diamond_ore can break diamond ore. A player without this permission cannot.

blockblock.place.* - Gives permission to place every block.
blockblock.place.[blockname] - Gives permission to place a specific block.
e.g. A player with the permission blockblock.place.diamond_block can place diamond blocks. A Player without this permission cannot.

This is my first plugin and it is very simple. As such I don't suspect it will need updating between versions, however in the event something completely breaks, please let me know and I will address it as I am able.