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Adjusted structure and enabled referencing.

Change-Id: I23a8afd08ebb013d772314b450497c17bfdfc4fc
Signed-off-by: Sofia Wallin <sofia.wallin@ericsson.com>

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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. (c) ruan.he@orange.com & thomas.duval@orange.com
+
+
+Introduction
+============
+
+This guide presents the use of the Moon platform.
+The MoonClient script allows the administrator/user to drive the Moon platform and
+some parts of the Keystone server itself.
+
+Scenario components and composition
+===================================
+
+###Functional architecture
+Moon can be considered as a management layer over OpenStack.
+We can dynamically create security modules in Moon and assign these modules to protect different
+tenants in OpenStack.
+![](../img/moon_infra.png)
+
+###Policy engine
+The core part of the security management layer is its policy engine.
+The policy engine should be at same time generic to support a large set of security models
+used by consumers and robust so that all the manipulations on the policy engine need to be proved correct.
+For all these purposes, we designed EMTAC (Extensible Multi-tenancy Access Control) meta-model,
+which defines policy specification, policy administration, inter-policy collaboration and administration
+over this collaboration.
+![](../img/policy_engine.png)
+
+###User-centric
+At the same time, Moon enables administrators or a third-party application to define, configure and manage
+its policies. Such a user-centric aspect helps users to define their own manner in using
+OpenStack’s resources.
+
+###Authorization enforcement in OpenStack
+As the first step, the security policy in Moon is enforced by authorization mechanism in Keystone and Nova
+and Swift.
+All the operations in Keystone and Nova and Swift are controlled and validated by Moon.
+In OpenStack, we implemented 3 hooks respectively for Keystone and Nova and Swift, the hooks will
+redirect all authorization requests to Moon and return decision from Moon.
+
+###Log System
+Traceability and accountability are also handled in Moon, all the operations and interactions
+are logged and can be consulted for any purpose.
+
+###Separation of management layer from OpenStack
+The separation of management layer from OpenStack makes the management system totally
+independent from OpenStack. We can install Moon in client’s local so that Moon can be
+locally administrated by clients and remotely project their data which are hosted in
+Cloud Service Provider’s datacenter.
+
+Scenario usage overview
+=======================
+
+The Moon platform is built on the OpenStack Keystone component. While Keystone manages the identification
+and the authentication process, Moon manages the authorisation process for all actions that comes through it.
+The current version of Moon can only manage a subset of actions: actions from Nova and Swift.
+For example, when a user wanted to stop a virtual machine with Nova, the authorisation for that action of stopping
+is delegated through KeystoneMiddleware to the Moon platform.
+
+The MoonClient script helps administrators to configure the Moon platform and the authorisation rules.
+It can be used like the OpenStack client with the same environment variables.
+
+Each OpenStack project (or tenant) car be mapped to an intra-extension.
+That intra-extension will contain the configuration for the authorisation process for that tenant.
+Each intra-extension is configured with subjects, objects and actions. A subject makes an action on an object.
+Those elements can be placed into categories, for example a subject can have a value on the role category.
+Those values are saved into the scope element.
+For example, the subject (which is also called user) "admin" can have the role "admin" and "dev" on the project "admin".
+The same mapping applies to the object and the action element.
+For example, the action "stop a VM" can be place in a particular category "access" with the scope "write".
+The action "stop a VM" is considered as the user has a write access to the VM.
+
+In order to grant or not an action in the system, Moon uses rules built with the scope values.
+If we consider that a rule is constituted with a role for the subject category,
+an ID and a security level for the object category and an access value for the action category, we can built rules
+with values like the following ones:
+
+- admin, id1, level_high, write
+- admin, id1, level_low, read
+- dev, id2, level_high, read
+
+All configuration can be done with the MoonClient script.
+If a project is not mapped to a intra-extension, it can be used as if the Moon platform doesn't exist.
+
+Limitations, Issues and Workarounds
+===================================
+
+The Moon platform can only be used to authorize Nova and Swift actions. In future releases, it could manage
+more OpenStack components like Neutron, Glance, ...
+
+References
+==========
+
+For more information on the OPNFV Colorado release, please visit
+http://www.opnfv.org/colorado
+
+Revision: _sha1_
+
+Build date: |today|