terraform.aws.security.aws-efs-filesystem-encrypted-with-cmk.aws-efs-filesystem-encrypted-with-cmk

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Ensure EFS filesystem is encrypted at rest using KMS CMKs. CMKs gives you control over the encryption key in terms of access and rotation.

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Defintion

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rules:
  - id: aws-efs-filesystem-encrypted-with-cmk
    patterns:
      - pattern: |
          resource "aws_efs_file_system" $ANYTHING {
            ...
            encrypted  = true
            ...
          }
      - pattern-not-inside: |
          resource "aws_efs_file_system" $ANYTHING {
            ...
            encrypted  = true
            kms_key_id = ...
            ...
          }
    message: Ensure EFS filesystem is encrypted at rest using KMS CMKs. CMKs gives
      you control over the encryption key in terms of access and rotation.
    metadata:
      category: security
      technology:
        - terraform
        - aws
      owasp:
        - A03:2017 - Sensitive Data Exposure
      cwe:
        - "CWE-320: CWE CATEGORY: Key Management Errors"
      references:
        - https://owasp.org/Top10/A02_2021-Cryptographic_Failures
      subcategory:
        - audit
      likelihood: MEDIUM
      impact: MEDIUM
      confidence: MEDIUM
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Cryptographic Issues
    languages:
      - hcl
    severity: WARNING

Examples

aws-efs-filesystem-encrypted-with-cmk.tf

resource "aws_efs_file_system" "pass" {
  encrypted  = true
  kms_key_id = aws_kms_key.test.arn
}
# ruleid: aws-efs-filesystem-encrypted-with-cmk
resource "aws_efs_file_system" "fail" {
  encrypted  = true
 }