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role-based-access-control.md

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+# Role Based Access Control (RBAC)
+
+_Understand_ the fundamentals of Role Based Access Control (RBAC)
+
+## Why?
+
+RBAC lets you easily manage roles and permissions in any application
+and see at a glance exactly permissions a person has in the system.
+It reduces complexity over traditional
+Access Control List (ACL) based permissions systems. 
+
+
+## What?
+
+The purpose of RBAC is to provide a framework
+for application administrators and developers
+to manage the permissions assigned to the people using the App(s).
+
+Each role granted just enough flexibility and permissions 
+to perform the tasks required for their job, 
+this helps enforce the 
+[principal of least privilege](https://en.wikipedia.org/wiki/Principle_of_least_privilege)
+
+The RBAC methodology is based on a set of three principal rules 
+that govern access to systems:
+
+1. **Role Assignment**: 
+Each transaction or operation can only be carried out 
+if the person has assumed the appropriate role. 
+An operation is defined as any action taken 
+with respect to a system or network object that is protected by RBAC. 
+Roles may be assigned by a separate party 
+or selected by the person attempting to perform the action.
+
+2. **Role Authorization**: 
+The purpose of role authorization 
+is to ensure that people can only assume a role 
+for which they have been given the appropriate authorization. 
+When a person assumes a role, 
+they must do so with authorization from an administrator.
+
+3. **Transaction Authorization**: 
+An operation can only be completed 
+if the person attempting to complete the transaction 
+possesses the appropriate role.
+
+
+## Who?
+
+Anyone who is interested in developing secure multi-user applications
+should learn about RBAC.
+
+
+## _How_?
+
+Let's create the Database Schemas (Tables) to store our RBAC data,
+starting with **`Roles`**:
+
+```
+mix phx.gen.html Ctx Role roles name:string desc:string person_id:references:people
+```
+
+
+```
+mix phx.gen.html Ctx Permission permissions name:string desc:string person_id:references:people
+```
+
+Next create the **`many-to-many`** relationship between roles and permissions.
+
+```
+mix ecto.gen.migration create_role_permissions
+```
+
+Now create the **`many-to-many`** relationship between people and roles.
+
+
+
+
+## Recommended Reading
+
++ https://en.wikipedia.org/wiki/Role-based_access_control
++ https://www.sumologic.com/glossary/role-based-access-control
++ https://medium.com/@adriennedomingus/role-based-access-control-rbac-permissions-vs-roles-55f1f0051468