ACM certificates should have transparency logging enabled¶

Ensure ACM certificates transparency logging is enabled as certificate transparency logging guards against SSL/TLS certificates issued by mistake or by a compromised certificate authority.

How to fix¶

Attribute options[0].certificate_transparency_logging_preference of aws_acm_certificate must be "ENABLED".

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.

module "acm" {
  source  = "nistcsf.compliance.tf/terraform-aws-modules/acm/aws"
  version = ">=6.0.0,<7.0.0"

  domain_name               = "example.com"
  subject_alternative_names = ["*.example.com"]
  wait_for_validation       = false
  zone_id                   = "Z1234567890ABC"

  certificate_transparency_logging_preference = "ENABLED"
}

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

If you use terraform-aws-modules/acm/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 "acm" {
  source  = "terraform-aws-modules/acm/aws"
  version = ">=6.0.0,<7.0.0"

  domain_name               = "example.com"
  subject_alternative_names = ["*.example.com"]
  wait_for_validation       = false
  zone_id                   = "Z1234567890ABC"

  certificate_transparency_logging_preference = "ENABLED"
}

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_acm_certificate.

resource "aws_acm_certificate" "this" {
  domain_name       = "example.com"
  validation_method = "DNS"

  options {
    certificate_transparency_logging_preference = "ENABLED"
  }
}

Tool mappings¶

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

• Compliance.tf (CTF) Control: acm_certificate_transparency_logging_enabled

• Checkov Check: CKV_AWS_234

• Powerpipe Control: aws_compliance.control.acm_certificate_transparency_logging_enabled