IAM database authentication is not enabled

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Metadata

Id: ansible-aws-iam-database-auth-not-enabled

Cloud Provider: AWS

Platform: Ansible

Severity: Medium

Category: Encryption

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Description

IAM database authentication should be enabled to avoid reliance on static database passwords and centralize access control. This reduces the risk of credential leakage and makes rotation and auditing easier.

For Ansible RDS resources using the amazon.aws.rds_instance or rds_instance modules, the enable_iam_database_authentication property must be defined and set to true. This check only applies to engines, engine versions, and instance types that support IAM authentication. The policy validates engine, engine_version, and instance_type. Resources where the property is missing or set to false are flagged.

Secure Ansible example:

- name: Create RDS instance with IAM auth enabled
  amazon.aws.rds_instance:
    db_instance_identifier: mydb
    engine: mysql
    engine_version: "8.0"
    instance_type: db.t3.medium
    enable_iam_database_authentication: true

Compliant Code Examples

- name: create minimal aurora instance in default VPC and default subnet group
  amazon.aws.rds_instance:
    engine: aurora
    db_instance_identifier: ansible-test-aurora-db-instance
    instance_type: db.t2.small
    password: '{{ password }}'
    username: '{{ username }}'
    cluster_id: ansible-test-cluster
    enable_iam_database_authentication: true


- name: Create a DB instance using the default AWS KMS encryption key
  amazon.aws.rds_instance:
    db_instance_identifier: test-encrypted-db
    id: test-encrypted-db
    state: present
    engine: mariadb
    storage_encrypted: true
    db_instance_class: db.t2.medium
    username: '{{ username }}'
    password: '{{ password }}'
    allocated_storage: '{{ allocated_storage }}'
    enable_iam_database_authentication: true

- name: remove the DB instance without a final snapshot
  amazon.aws.rds_instance:
    db_instance_identifier: test-db-remove-1
    id: '{{ instance_id }}'
    state: absent
    skip_final_snapshot: true
    enable_iam_database_authentication: true

- name: remove the DB instance with a final snapshot
  amazon.aws.rds_instance:
    db_instance_identifier: test-db-remove-2
    id: '{{ instance_id }}'
    state: absent
    final_snapshot_identifier: '{{ snapshot_id }}'
    enable_iam_database_authentication: true

- name: create minimal aurora instance in default VPC and default subnet group
  amazon.aws.rds_instance:
    engine: aurora
    db_instance_identifier: ansible-test-aurora-db-instance
    instance_type: db.t2.small
    password: "{{ password }}"
    username: "{{ username }}"
    cluster_id: ansible-test-cluster
    enable_iam_database_authentication: "No"

- name: create minimal aurora instance in default VPC and default subnet group
  amazon.aws.rds_instance:
    engine: mariadb
    engine_version: 10.2.43
    db_instance_identifier: ansible-test-aurora-db-instance
    instance_type: db.t2.small
    password: "{{ password }}"
    username: "{{ username }}"
    cluster_id: ansible-test-cluster

Non-Compliant Code Examples

- name: create minimal aurora instance in default VPC and default subnet group
  amazon.aws.rds_instance:
    engine: mysql
    db_instance_identifier: ansible-test-aurora-db-instance
    instance_type: db.t2.small
    password: "{{ password }}"
    username: "{{ username }}"
    cluster_id: ansible-test-cluster
    enable_iam_database_authentication: "No"


- name: Create a DB instance using the default AWS KMS encryption key
  amazon.aws.rds_instance:
    db_instance_identifier: test-encrypted-db
    id: test-encrypted-db
    state: present
    engine: mariadb
    storage_encrypted: True
    db_instance_class: db.t2.medium
    username: "{{ username }}"
    password: "{{ password }}"
    allocated_storage: "{{ allocated_storage }}"
    enable_iam_database_authentication: false