Ensure S3 bucket Object is encrypted by KMS using a customer managed Key (CMK)

Error: AWS S3 Object Copy not encrypted using Customer Managed Key
Bridgecrew Policy ID: BC_AWS_GENERAL_106
Checkov Check ID: CKV_AWS_186
Severity: LOW

AWS S3 Object Copy not encrypted using Customer Managed Key

Description

This is a simple check to ensure that the S3 bucket Object is using AWS key management - KMS to encrypt its contents. To resolve add the ARN of your KMS or link on creation of the object.

Fix - Buildtime

Terraform

  • Resource: aws_s3_bucket_object
  • Attribute: kms_key_id - (Optional) Specifies the AWS KMS Key ARN to use for object encryption. This value is a fully qualified ARN of the KMS Key.
resource "aws_s3_bucket_object" "object" {
  bucket = "your_bucket_name"
  key    = "new_object_key"
  source = "path/to/file"
+ kms_key_id = "ckv_kms"

  # The filemd5() function is available in Terraform 0.11.12 and later
  # For Terraform 0.11.11 and earlier, use the md5() function and the file() function:
  # etag = "${md5(file("path/to/file"))}"
  etag = filemd5("path/to/file")
}

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