S3 Access Control
S3 Access Control provides mechanisms for controlling who can access your S3 buckets and objects. There are two primary methods: Access Control Lists (ACLs) which allow fine-grained control at the object level, and Bucket Policies that define permissions for an entire bucket. Additionally, you can use Identity and Access Management (IAM) policies to control access at the AWS account level, and S3 Object Lock to enforce object-level retention and protect from object modification or deletion.
Guide for AWS Solution Architect: Amazon S3 Access Control
Why is it important?
S3 Access Control is an essential part of Amazon S3 (Simple Storage Service) because it defines who can access your buckets and objects, and what actions they can take on them. With proper implementation of access control policies, your data remains secure and out of scope from unauthorized people and entities.
What is S3 Access Control?
S3 Access Control consists of access control lists (ACL), bucket policies, and IAM policies which determine the access permissions related to the S3 resources.
How does it work?
The permissions are granted or denied based on these policies. ACLs are applied at an object level, bucket policies are attached to the bucket and IAM policies are attached to users or user groups.
How to answer questions regarding S3 Access Control in an exam?
When answering the questions, consider the access level required, whether public or private, and the parties involved in accessing. Remember the governing principles of the least privilege. Also consider data sensitivity while designing access control.
Exam Tips: Answering Questions on S3 Access Control
Follow these tips:
1) Thoroughly understand the differences between ACL, Bucket policies, and IAM policies.
2) Consider 'the principle of least privilege' in every scenario.
3) Important to know that the Deny trumps Allow in case of a conflict.
4) Understand actions that can and cannot be performed with each kind of policy.
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