Can I do that with policy? Understanding the AWS Service Authorization Reference

The provided document outlines how to use IAM policies in AWS to control and restrict actions based on specific conditions. It explains that while many requirements can be met using IAM policies, there are certain limitations where additional measures or services might be necessary beyond just policy-based controls.

Key Points:

1. Understanding IAM Policies:

   • IAM policies define what users, groups, roles, and other AWS entities can do in your account.
   • The document emphasizes the importance of understanding the actions and condition keys available for each service to effectively control access.

2. Amazon EC2 Service Authorization Reference:

   • This reference provides details on which actions are allowed or denied based on specific conditions.
   • For example, when reviewing the ec2:AuthorizeSecurityGroupIngress action, you can see that it allows adding inbound rules to a security group but does not provide condition keys for filtering by IP ranges (like 0.0.0.0/0) or ports.

3. Example Policies:

   • The document provides examples of how IAM policies can be used to enforce specific access controls.
     • Policy 1: Allows users to launch EC2 instances with certain instance types based on their cost center tags.

Read the full article at AWS Security Blog

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