DR of an encrypted snapshot may fail with the “Not Authorized to use key” error

Problem: DR copy may fail with errors like “Not authorized to perform” or “not authorized to use key”

Example in CPM backup log:

10-24-18 10:11:04 - Error - Volume DR copy snapshot failed for region US East (N. Virginia), snapshot snap-11111111111111111 (to DR account). Reason: Failed adding share permission to snapshot snap-11111111111111111 (original volume: vol-22222222222222222). Reason: Not authorized to use key arn:aws:kms:us-east-1:1234567890ab:key/ba1234567890-1234-5678-283746163517

Example from AWS CloudTrail JSON log:

This is an example of the error on the ReEncrypt operation

User: arn:aws:sts::444996954394:assumed-role/CPM-Service-Backups-Role/CPM-assumed-prod is not authorized to perform: kms:ReEncryptFrom on resource: arn:aws:kms:us-east-1:1234567890ab:key/ba1234567890-1234-5678-283746163517

This is an example of the error on the ModifySnapshotAttribute operation

Not authorized to use key arn:aws:kms:us-east-1:1234567890ab:key/ba1234567890-1234-5678-283746163517

The user identity is not going to be listed in the CloudTrail “errorMessage” attribute in the example  above, you will need to look for the “userIdentity/arn” attribute to find the user identity.

 

Cause: This is caused by the user/role not being listed as a “key user” for that key.

Solution: Add this user/role as a “key user” for that key. Navigate to the KMS page on AWS and select your KMS key. Then under " key users" add the user or role.

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