Which service allows for fine-grained permissions management across AWS resources?

AWS Identity and Access Management (IAM) is the service that provides fine-grained permissions management across AWS resources. IAM allows administrators to create and manage users and groups, and assign specific permissions to them, controlling access to AWS services and resources at a very detailed level. This capability is essential for enforcing security policies that align with an organization’s requirements.

Using IAM, administrators can define who can access what resources, as well as the specific actions that can be performed on those resources. For instance, a user might have permissions to read data from an S3 bucket but not to delete or write to that bucket, thereby maintaining a controlled environment and minimizing risks. The ability to set policies that dictate permissions based on attributes such as conditions and resource types showcases IAM’s flexibility in managing access effectively.

In contrast, the other services listed do not focus specifically on fine-grained permissions management. AWS Security Hub is primarily focused on security posture management, AWS Organizations helps in managing multiple AWS accounts and policy application across them, and AWS Audit Manager is designed for auditing and compliance monitoring rather than for direct access control. Thus, IAM stands out as the principal tool for granular permission management within the AWS environment.