A List‘s creator, called its owner, can share the list with other Users or Teams. TinyTodo uses Cedar to control who has access to what. We don’t want to allow TinyTodo users to see or make changes to just any task list. As tasks are completed, they can be checked off the list. Users create Lists which they can populate with tasks. TinyTodo allows individuals, called Users, and groups, called Teams, to organize, track, and share their todo lists. A more detailed version of this post is included with the TinyTodo code. We present examples of TinyTodo permissions as Cedar policies and how TinyTodo uses the Cedar authorization engine to ensure that only intended users are granted access. In this blog post, we introduce Cedar and the SDK using an example application, TinyTodo, whose users and teams can organize, track, and share their todo lists.
Because Cedar policies are separate from application code, they can be independently authored, analyzed, and audited, and even shared among multiple applications. You specify fine-grained permissions as Cedar policies, and your application authorizes access requests by calling the Cedar SDK’s authorization engine. Cedar has a simple and expressive syntax that supports common authorization paradigms, including both role-based access control (RBAC) and attribute-based access control (ABAC). You can use Cedar to control access to resources such as photos in a photo-sharing app, compute nodes in a micro-services cluster, or components in a workflow automation system.
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Cedar is an open source language and software development kit (SDK) for writing and enforcing authorization policies for your applications.
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