Support an S3 bucket in a different account #245
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Allow principals in the S3 bucket's account to use the KMS Key to decrypt logs. S3 itself cannot tell us which account an arbitrary bucket is in, so the caller must provide it. Useful when using an Organization CloudTrail and a dedicated AWS account for logs, as recommended by [AWS Multi-account strategy](https://docs.aws.amazon.com/whitepapers/latest/organizing-your-aws-environment/organizing-your-aws-environment.html).
So it can be used in for a bucket policy or similar.
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Allow principals in the S3 bucket's account to use the KMS Key to decrypt logs.
S3 itself cannot tell us which account an arbitrary bucket is in, so the caller must provide it.
Useful when using an Organization CloudTrail and a dedicated AWS account for logs, as recommended by AWS Multi-account strategy.
Fixes #240
logs encrypted with other aws account cmk
Changes proposed in this pull request: