Learn about Amazon S3 bucket default access permissions. By default, S3 buckets are private, and only the resource owner can access them. Find out who can view objects in an S3 bucket.
Table of Contents
Question
When a developer creates an Amazon S3 bucket, they can set access permissions. Suppose that they leave the defaults and make no changes to the settings. Who can view objects in the bucket?
A. Subscribers to the developer’s application
B. Anyone in the developer’s organization
C. Only the developer
D. The public
Answer
C. Only the developer
Explanation
Amazon S3 is secure by default. If you make no changes to the default settings, only you will be able to view and work with the objects in your bucket. You can change the permissions to grant access to specific objects or the entire bucket depending on the use case.
When a developer creates an Amazon S3 bucket, the default access permissions are crucial to understand. Let’s delve into the details:
- Resource Ownership:
- By default, all S3 buckets are private. This means that only the resource owner, which is the AWS account that created the bucket, can access these resources.
- The resource owner refers to the account that initiated the bucket creation process.
- Access to Objects:
- When a developer creates an S3 bucket and leaves the defaults unchanged, only the resource owner (i.e., the AWS account that owns the bucket) can view objects within that bucket.
- No other users or entities have access unless explicit permissions are granted.
- Implicit Denial:
- If no explicit access is granted (i.e., no specific permissions are configured), access is implicitly denied.
- This means that even if other users or services attempt to access the bucket, they won’t be able to unless granted permission.
- Access Control via Policies:
- To control access further, developers can write IAM user policies that specify which users or groups can access specific buckets and objects.
- These policies allow fine-grained control over who can read, write, or manage objects within the bucket.
In summary, when a developer creates an S3 bucket and leaves the default settings unchanged, only the resource owner (the AWS account that created the bucket) can view objects. Other users, subscribers, or members of the developer’s organization will not have access unless explicitly granted by modifying the bucket’s permissions.
Therefore, the correct answer is C. Only the developer. The public does not have access by default.
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