Resource Based Policy

Question

Hi Team,

I transferred a snapshot of database from AWS account A to Account B which is encrypted by kms. Now the encrypted snapshot is  in account B's s3 bucket and I wanted to create Glue tables using Crawler in account B.

The KMS key is in  AWS account A. 
I gave KMS decrypt permission on account A KMS key to the glue crawler IAM role in account B but did not give any resource based policy in account A . Now the crawler is able to create Glue tables in account B.

How is this possible when I did not give any resource based policy in account A?

Answer

"*Now the encrypted snapshot is in account B", inside the same account if a role has s3 read permission and the bucket doesn't have a explicitly policy, by default you have access.

Resource Based Policy

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