An AWS account includes two S3 buckets: bucketl and bucket2.

Understanding the IAM Policy:

The IAM useralicehas an explicit permission in the IAM policy to perform alls3:*actions on bothbucket1andbucket2resources.

This grants useralicefull access to both buckets from the IAM policy perspective.

Bucket Policy for bucket1:

The bucket policy forbucket1explicitly grants useralicefull access to this bucket.

This policy reinforces the permissions provided by the IAM policy.

Bucket Policy for bucket2:

bucket2does not have a bucket policy defined.

In the absence of a bucket policy, the permissions fall back to the IAM policy.

Effective Permissions:

Since the IAM policy grants access to both buckets, and there are no conflicting explicit deny statements, useralicecan access bothbucket1andbucket2.

IAM Policies and Bucket Policies

Evaluating Access with S3 Policies