Juju charm-helpers hardening library

Description

This library provides multiple implementations of system and application hardening that conform to the standards of http://hardening.io/.

Current implementations include:

Synchronise this library into your charm and add the harden() decorator (from contrib.hardening.harden) to any functions or methods you want to use to trigger hardening of your application/system.
Add a config option called 'harden' to your charm config.yaml and set it to a space-delimited list of hardening modules you want to run e.g. "os ssh"
Override any config defaults (contrib.hardening.defaults) by adding a file called hardening.yaml to your charm root containing the name(s) of the modules whose settings you want override at root level and then any settings with overrides e.g.

os: general: desktop_enable: True
Now just run your charm as usual and hardening will be applied each time the hook runs.