rules:
- id: aws-ebs-volume-unencrypted
  patterns:
  - pattern: |
      resource "aws_ebs_volume" $ANYTHING {
        ...
      }
  - pattern-not: |
      resource "aws_ebs_volume" $ANYTHING {
        ...
        encrypted = true
        ...
      }
  message: >-
    The AWS EBS volume is unencrypted. The volume, the disk I/O and any derived
    snapshots could be read if compromised. Volumes should be encrypted to ensure
    sensitive data is stored securely.
  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://owasp.org/Top10/A04_2021-Insecure_Design
    - https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ebs_volume#encrypted
    - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSEncryption.html
    subcategory:
    - audit
    likelihood: MEDIUM
    impact: HIGH
    confidence: MEDIUM