OpenSearch domains should use HTTPS¶

This control checks whether connections to OpenSearch domains are using HTTPS. The rule is non-compliant if the OpenSearch domain 'EnforceHTTPS' is not 'true' or is 'true' and 'TLSSecurityPolicy' is not in 'tlsPolicies'.

How to fix¶

Attribute domain_endpoint_options[0].enforce_https of aws_opensearch_domain must be true.

Implementation options¶

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

Option 1: Compliance.tf module (recommended)¶

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.

Title 21 CFR Part 11EU GMP Annex 11HIPAA Omnibus Rule 2013HIPAA Security Rule 2003NIST Cybersecurity Framework v1.1PCI DSS v3.2.1PCI DSS v4.0RBI IT Framework for NBFCs

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  = "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  = "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"
}

module "opensearch" {
  source  = "rbiitfnbfc.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"

  domain_endpoint_options = {
    enforce_https = 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)]
  }

  domain_endpoint_options {
    enforce_https = 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_https_required
AWS Config Managed Rule: OPENSEARCH_HTTPS_REQUIRED
Powerpipe Control: aws_compliance.control.opensearch_domain_https_required