Grant Access to Control Tower created Cloudtrail S3 Bucket

Question

Hi,
I have what I think is a common use case:
Control Tower creates an S3 Bucket in the Logging account where it centralizes all Cloudtrail and Config logs. Control Tower also deploys a mandatory Guardrail named "Disallow changes to bucket policy for AWS Control Tower created Amazon S3 buckets in log archive". So far so good. However, and I think it is a very common use case, I have a third-party solution in another account which needs access to those logs and I cannot grant access because I the Guardrail is preventing me from modifying the bucket policy.

What is the right way to grant access to these logs? There must be an elegant solution to this problem since there is no point on having logs if nobody can access them.

Thanks

Answer

Hi Pedro,  You will need to update the bucket policy to grant access to your third-party application.  As you pointed out, AWS Control Tower Guardrail prevents updates to bucket policies, so you will need to log into the Organization Management account first, then use the Switch Role capability from the drop down menu under your login in the upper right, to assume the AWSControlTowerExecution role in the Logging account.  Using that role, you will be able to update the bucket policy in the Logging account.  If you prefer doing this in code, you can also accomplish this using the AssumeRole cli command.

Grant Access to Control Tower created Cloudtrail S3 Bucket

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