Alex Kavanagh 9c12812735 Switch the charm to support py3
Some major changes:
* the charm has been rebased (from a Python perspective) to be rooted in
  the charm directory.  This is a single root.
* Imports have been changed so that the don't add lots of imports to the
  namespace of the module doing the import.
* The code that used to run at module import time has been made lazy
  such that it only has to run if the relevant functions are called.
  This includes restart_on_change parameters, the harden function and
  the parameters to the guard_map.  Appropriate changes will be
  submitted to charm-helpers.
* Several tests had to be re-written as (incorrect) mocking meant that
  text fixtures didn't actually match what the code was doing.  Thus,
  the tests were meaningless.
* This has had a net positive impact on the unit tests wrt to importing
  modules and mocking.

Change-Id: Id07d9d1caaa9b29453a63c2e49ba831071e9457f
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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:

  • OS
  • SSH
  • MySQL
  • Apache

Requirements

  • Juju Charms

Usage

  1. 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.

  2. 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"

  3. 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

  4. Now just run your charm as usual and hardening will be applied each time the hook runs.