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Athena databases and workgroup configurations are created unencrypted at rest by default, they should be encrypted

Default Severity: high

Explanation

Athena databases and workspace result sets should be encrypted at rests. These databases and query sets are generally derived from data in S3 buckets and should have the same level of at rest protection.

Possible Impact

Data can be read if the Athena Database is compromised

Suggested Resolution

Enable encryption at rest for Athena databases and workgroup configurations

Insecure Example

The following example will fail the aws-athena-enable-at-rest-encryption check. 

 resource "aws_athena_database" "bad_example" {
   name   = "database_name"
   bucket = aws_s3_bucket.hoge.bucket
 }

 resource "aws_athena_workgroup" "bad_example" {
   name = "example"

   configuration {
     enforce_workgroup_configuration    = true
     publish_cloudwatch_metrics_enabled = true

     result_configuration {
       output_location = "s3://${aws_s3_bucket.example.bucket}/output/"
     }
   }
 }

Secure Example

The following example will pass the aws-athena-enable-at-rest-encryption check. 

 resource "aws_athena_database" "good_example" {
   name   = "database_name"
   bucket = aws_s3_bucket.hoge.bucket

   encryption_configuration {
      encryption_option = "SSE_KMS"
      kms_key_arn       = aws_kms_key.example.arn
  }
 }

 resource "aws_athena_workgroup" "good_example" {
   name = "example"

   configuration {
     enforce_workgroup_configuration    = true
     publish_cloudwatch_metrics_enabled = true

     result_configuration {
       output_location = "s3://${aws_s3_bucket.example.bucket}/output/"

       encryption_configuration {
         encryption_option = "SSE_KMS"
         kms_key_arn       = aws_kms_key.example.arn
       }
     }
   }
 }