What should the developer do to resolve this error?
Update the policy of the IAM user to allow the s3:EncryptionConfiguration action.
Update the bucket policy of the S3 bucket to allow the IAM user to upload objects.
Update the policy of the IAM user to allow the kms:GenerateDataKey action.
Update the ACL of the S3 bucket to allow the IAM user to upload objects.
Explanations:
The s3action does not exist; therefore, updating the IAM user policy to allow this action will not resolve the access denied error. The issue lies with permissions related to KMS, not encryption configuration.
While updating the bucket policy to allow the IAM user to upload objects might seem like a solution, the IAM user already has s3permission. The problem is likely due to insufficient permissions related to KMS, not the S3 bucket policy itself.
The IAM user needs permission to use the KMS key for encryption when uploading objects. Allowing the kmsaction grants the necessary permissions to create data keys for encryption, which is required for successful uploads to the S3 bucket with SSE-KMS.
Updating the ACL of the S3 bucket is not necessary in this scenario. The IAM user already has the required permissions through its policy. The access denied error is more likely due to KMS permissions rather than ACL issues.
I map out that the answer is:
Update the policy of the IAM user to allow the kms:GenerateDataKey action.