EFS without KMS

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Metadata

Id: bd77554e-f138-40c5-91b2-2a09f878608e

Cloud Provider: AWS

Platform: Ansible

Severity: Low

Category: Encryption

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Description

EFS filesystems should be encrypted with a customer-managed AWS KMS CMK to protect data at rest and maintain control over key rotation, access policies, and audit logging.

In Ansible, the kms_key_id option on the community.aws.efs (or legacy efs) module must be defined and set to a customer-managed key identifier (KMS key ID, key ARN, or alias) rather than relying on the AWS-managed key. Tasks that omit kms_key_id or leave it undefined default to an AWS-managed key and are flagged by this rule.

Secure configuration example:

- name: Create encrypted EFS filesystem
  community.aws.efs:
    name: my-efs
    performance_mode: generalPurpose
    kms_key_id: arn:aws:kms:us-east-1:123456789012:key/abcdef12-3456-7890-abcd-ef1234567890
    state: present

Compliant Code Examples

- name: foo
  community.aws.efs:
    state: present
    name: myTestEFS
    encrypt: yes
    tags:
      Name: myTestNameTag
      purpose: file-storage
    targets:
    - subnet_id: subnet-748c5d03
      security_groups: [sg-1a2b3c4d]
    kms_key_id: "some-key-id"

Non-Compliant Code Examples

---
- name: foo
  community.aws.efs:
    state: present
    name: myTestEFS
    encrypt: no
    tags:
      Name: myTestNameTag
      purpose: file-storage
    targets:
      - subnet_id: subnet-748c5d03
        security_groups: ["sg-1a2b3c4d"]