rules:
- id: aws-dynamodb-table-unencrypted
  patterns:
  - pattern: |
      resource "aws_dynamodb_table" $ANYTHING {
        ...
      }
  - pattern-not-inside: |
      resource "aws_dynamodb_table" $ANYTHING {
        ...
        server_side_encryption {
          enabled = true
          kms_key_arn = ...
        }
        ...
      }
  message: >-
    By default, AWS DynamoDB Table is encrypted using AWS-managed keys.
    However, for added security, it's recommended to configure your own AWS KMS encryption key to protect your data in the DynamoDB table.
    You can either create a new aws_kms_key resource or use the ARN of an existing key in your AWS account to do so.
  languages: [hcl]
  severity: WARNING
  metadata:
    owasp:
    - A03:2017 - Sensitive Data Exposure
    - A02:2021 - Cryptographic Failures
    cwe:
    - 'CWE-326: Inadequate Encryption Strength'
    technology:
    - aws
    - terraform
    category: security
    references:
    - https://owasp.org/Top10/A02_2021-Cryptographic_Failures
    subcategory:
    - vuln
    likelihood: MEDIUM
    impact: MEDIUM
    confidence: MEDIUM