Setting up security

Let's talk about an important topic: how we secure access for entities that are invoking functions, as well as what functions can do while executing. These security features are used to secure the Lambda service itself and wouldn't necessarily be used to secure a web application.

Next up, we will cover the permissions model. You will learn about the difference between execution policies using IAM roles, as well as function/resource policies.

Execution policies

The first thing we should talk about is execution policies. These policies are attached to a service-linked role and define what AWS resources can be accessed by that role. The policy itself follows the same syntax as an IAM policy and...