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OpenSearch domains should have encryption at rest enabled

This control checks whether AWS OpenSearch domains have encryption-at-rest configuration enabled. The check fails if encryption at rest is not enabled.

How to fix

Attribute encrypt_at_rest[0].enabled of aws_opensearch_domain must be true.

Implementation options

Choose the option that matches how you manage Terraform. All options satisfy this control.

Use the compliance.tf registry module to get this control enforced by default. This control is mapped to the frameworks shown in the tabs above. To begin, see get started with compliance.tf.

module "opensearch" {
  source  = "cfrpart11.compliance.tf/terraform-aws-modules/opensearch/aws"
  version = ">=2.0.0,<3.0.0"

  cluster_config = {
    instance_count = 1
    instance_type  = "t3.small.search"
  }
  domain_name = "abc123"
  ebs_options = {
    ebs_enabled = true
    volume_size = 64
    volume_type = "gp3"
  }
  engine_version = "OpenSearch_2.11"
}

module "opensearch" {
  source  = "eugmpannex11.compliance.tf/terraform-aws-modules/opensearch/aws"
  version = ">=2.0.0,<3.0.0"

  cluster_config = {
    instance_count = 1
    instance_type  = "t3.small.search"
  }
  domain_name = "abc123"
  ebs_options = {
    ebs_enabled = true
    volume_size = 64
    volume_type = "gp3"
  }
  engine_version = "OpenSearch_2.11"
}

module "opensearch" {
  source  = "hipaa.compliance.tf/terraform-aws-modules/opensearch/aws"
  version = ">=2.0.0,<3.0.0"

  cluster_config = {
    instance_count = 1
    instance_type  = "t3.small.search"
  }
  domain_name = "abc123"
  ebs_options = {
    ebs_enabled = true
    volume_size = 64
    volume_type = "gp3"
  }
  engine_version = "OpenSearch_2.11"
}

module "opensearch" {
  source  = "hipaasecurity2003.compliance.tf/terraform-aws-modules/opensearch/aws"
  version = ">=2.0.0,<3.0.0"

  cluster_config = {
    instance_count = 1
    instance_type  = "t3.small.search"
  }
  domain_name = "abc123"
  ebs_options = {
    ebs_enabled = true
    volume_size = 64
    volume_type = "gp3"
  }
  engine_version = "OpenSearch_2.11"
}

module "opensearch" {
  source  = "nist800171.compliance.tf/terraform-aws-modules/opensearch/aws"
  version = ">=2.0.0,<3.0.0"

  cluster_config = {
    instance_count = 1
    instance_type  = "t3.small.search"
  }
  domain_name = "abc123"
  ebs_options = {
    ebs_enabled = true
    volume_size = 64
    volume_type = "gp3"
  }
  engine_version = "OpenSearch_2.11"
}

module "opensearch" {
  source  = "nistcsfv11.compliance.tf/terraform-aws-modules/opensearch/aws"
  version = ">=2.0.0,<3.0.0"

  cluster_config = {
    instance_count = 1
    instance_type  = "t3.small.search"
  }
  domain_name = "abc123"
  ebs_options = {
    ebs_enabled = true
    volume_size = 64
    volume_type = "gp3"
  }
  engine_version = "OpenSearch_2.11"
}

module "opensearch" {
  source  = "nydfs23.compliance.tf/terraform-aws-modules/opensearch/aws"
  version = ">=2.0.0,<3.0.0"

  cluster_config = {
    instance_count = 1
    instance_type  = "t3.small.search"
  }
  domain_name = "abc123"
  ebs_options = {
    ebs_enabled = true
    volume_size = 64
    volume_type = "gp3"
  }
  engine_version = "OpenSearch_2.11"
}

module "opensearch" {
  source  = "pcidssv321.compliance.tf/terraform-aws-modules/opensearch/aws"
  version = ">=2.0.0,<3.0.0"

  cluster_config = {
    instance_count = 1
    instance_type  = "t3.small.search"
  }
  domain_name = "abc123"
  ebs_options = {
    ebs_enabled = true
    volume_size = 64
    volume_type = "gp3"
  }
  engine_version = "OpenSearch_2.11"
}

module "opensearch" {
  source  = "pcidss.compliance.tf/terraform-aws-modules/opensearch/aws"
  version = ">=2.0.0,<3.0.0"

  cluster_config = {
    instance_count = 1
    instance_type  = "t3.small.search"
  }
  domain_name = "abc123"
  ebs_options = {
    ebs_enabled = true
    volume_size = 64
    volume_type = "gp3"
  }
  engine_version = "OpenSearch_2.11"
}

Option 2: Open source module (terraform-aws-modules)

If you use terraform-aws-modules/opensearch/aws, configure the required module inputs to satisfy this control. You can later migrate to the compliance.tf module with minimal changes because it is compatible by design.

module "opensearch" {
  source  = "terraform-aws-modules/opensearch/aws"
  version = ">=2.0.0,<3.0.0"

  cluster_config = {
    instance_count = 1
    instance_type  = "t3.small.search"
  }
  domain_name = "abc123"
  ebs_options = {
    ebs_enabled = true
    volume_size = 64
    volume_type = "gp3"
  }
  engine_version = "OpenSearch_2.11"

  encrypt_at_rest = {
    enabled = true
  }
}

Option 3: Terraform AWS provider resources

If you manage resources directly, configure the relevant Terraform AWS provider resources to meet this control. See docs for the resources involved: aws_opensearch_domain.

resource "aws_opensearch_domain" "this" {
  advanced_security_options {
    enabled                        = true
    internal_user_database_enabled = false

    master_user_options {
      master_user_name     = "admin"
      master_user_password = "ChangeMe123!"
    }
  }

  cluster_config {
    instance_count         = 3
    instance_type          = "m5.large.search"
    zone_awareness_enabled = true
  }

  cognito_options {
    enabled          = true
    identity_pool_id = "us-east-1:12345678-1234-1234-1234-123456789012"
    role_arn         = "arn:aws:iam::123456789012:role/CognitoAccessForAmazonOpenSearch"
    user_pool_id     = "us-east-1_Example"
  }

  domain_name = "pofix-example"

  log_publishing_options {
    cloudwatch_log_group_arn = "arn:aws:logs:us-east-1:123456789012:log-group:example-log-group"
    log_type                 = "AUDIT_LOGS"
  }
  log_publishing_options {
    cloudwatch_log_group_arn = "arn:aws:logs:us-east-1:123456789012:log-group:example-log-group"
    log_type                 = "ES_APPLICATION_LOGS"
  }

  vpc_options {
    security_group_ids = ["sg-abc12345"]
    subnet_ids         = [element(["subnet-abc123", "subnet-def456"], 0)]
  }

  encrypt_at_rest {
    enabled = true
  }
}
Which option should I choose?
  • Compliance.tf module (recommended): controls enforced by default and mapped to frameworks.
  • Open source module (terraform-aws-modules): compatible by design with compliance.tf. Same variable names for an easy, low-change migration path when you are ready.
  • Terraform AWS provider resources: manage Terraform resources directly.

Tool mappings

Use these identifiers to cross-reference this control across tools, reports, and evidence.

  • Compliance.tf (CTF) Control: opensearch_domain_encryption_at_rest_enabled

  • AWS Config Managed Rules: ELASTICSEARCH_ENCRYPTED_AT_REST, OPENSEARCH_ENCRYPTED_AT_REST

  • Powerpipe Controls: aws_compliance.control.es_domain_encryption_at_rest_enabled, aws_compliance.control.opensearch_domain_encryption_at_rest_enabled