AWS S3 Bucket Policy Result

Answer: C.

Option A is incorrect because the policy consists of 2 statements, one is the allow for the user mark to access the bucket, and the next is the deny policy for all users.

The deny permission will override the allow, and hence all users will not have access to the bucket.

Option B is incorrect because deny policy will take the preference and deny access to all the bucket's objects.

This will overrule the allow access for user mark.

Option C is CORRECT because deny policy will take the preference and deny access for everyone.

Option D is incorrect because Option C is correct.

For examples on S3 bucket policies, please refer to the below Link:

http://docs.aws.amazon.com/AmazonS3/latest/dev/example-bucket-policies.html

The provided bucket policy contains two statements with different effects, one allows access to a specific user and the other denies access to everyone else.

Let's break down the policy and its elements to understand its implications:

• The "Statement" element indicates that there are two statements within this policy.
• The "Sid" element is a unique identifier for each statement, which can be used for reference.
• The "Action" element specifies the actions that are allowed or denied in the policy. In this case, the actions are set to "s3:*", which means all actions are allowed or denied depending on the "Effect".
• The "Effect" element specifies whether the policy allows or denies the actions specified in "Action". There are two effects in this policy, "Allow" and "Deny".
• The "Resource" element specifies the ARN (Amazon Resource Name) of the bucket or object to which the policy applies. In this policy, the "Resource" is set to "arn:aws:s3:::mybucket/*", which means the policy applies to all objects within the "mybucket" bucket.
• The "Principal" element specifies the entity or entities that are allowed or denied access. In this policy, there are two types of entities mentioned - a specific IAM user with the ARN "arn:aws:iam::111111111:user/mark" and everyone else ("*").

Now, let's analyze each statement:

1. The first statement with "Sid1" allows the user with ARN "arn:aws:iam::111111111:user/mark" to perform all actions on objects within the "mybucket" bucket. The "Principal" element restricts access only to this specific user, while the "Resource" element specifies the objects within the "mybucket" bucket. Therefore, the correct answer is (B) "It will allow the user mark from AWS account number 111111111 all access to the bucket but deny everyone else all access to the bucket."

2. The second statement with "Sid2" denies all actions on objects within the "mybucket" bucket to everyone else. The "Principal" element is set to "*" which means everyone else except the specific user mentioned in the first statement, and the "Resource" element is set to all objects within the "mybucket" bucket. Therefore, the second statement will deny all actions to everyone else except for the specific user mentioned in the first statement.

Therefore, the correct answer is (B) "It will allow the user mark from AWS account number 111111111 all access to the bucket but deny everyone else all access to the bucket."