rules:
- id: aws-documentdb-storage-unencrypted
  patterns:
  - pattern: |
      resource "aws_docdb_cluster" $ANYTHING {
        ...
      }
  - pattern-not-inside: |
      resource "aws_docdb_cluster" $ANYTHING {
        ...
        storage_encrypted = true
        ...
      }
  message: >-
    The AWS DocumentDB cluster is unencrypted. The data could be read if the
    underlying disks are compromised. You should enable storage encryption.
  languages:
  - hcl
  severity: WARNING
  metadata:
    category: security
    technology:
    - terraform
    - aws
    owasp:
    - A03:2017 - Sensitive Data Exposure
    - A04:2021 - Insecure Design
    cwe:
    - 'CWE-311: Missing Encryption of Sensitive Data'
    references:
    - https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/docdb_cluster#storage_encrypted
    - https://owasp.org/Top10/A04_2021-Insecure_Design
    subcategory:
    - audit
    likelihood: LOW
    impact: HIGH
    confidence: LOW