mondoo-terraform-aws-security.mql.yaml

# Copyright (c) Mondoo, Inc.
# SPDX-License-Identifier: BUSL-1.1

policies:
  - uid: mondoo-terraform-aws-security
    name: Terraform HCL Security Static Analysis for AWS
    version: 1.2.1
    license: BUSL-1.1
    tags:
      mondoo.com/category: security
      mondoo.com/platform: aws,cloud,terraform
    authors:
      - name: Mondoo, Inc
        email: hello@mondoo.com
    docs:
      desc: |
        ## Overview

        This policy checks for security misconfigurations in Terraform for Amazon Web Services.

        ## Local scan

        Local scan refer to scans of files and operating systems where cnspec is installed.

        ### Scan a Terraform project

        Open a terminal and run this command:

        ```bash
        cnspec scan terraform /path/to/terraform/directory
        ```

        ## Join the community!

        Our goal is to build policies that are simple to deploy, accurate, and actionable.

        If you have any suggestions for how to improve this policy, or if you need support, [join the community](https://github.com/orgs/mondoohq/discussions) in GitHub Discussions.
    groups:
      - title: AWS General
        filters: |
          asset.platform == "terraform" || asset.platform == "terraform-hcl"
          terraform.providers.any(nameLabel == "aws")
        checks:
          - uid: terraform-aws-security-no-static-credentials-in-providers
      - title: Amazon API Gateway
        filters: |
          asset.platform == "terraform" || asset.platform == "terraform-hcl"
          terraform.providers.any(nameLabel == "aws")
        checks:
          - uid: terraform-aws-security-api-gw-cache-enabled-and-encrypted
          - uid: terraform-aws-security-api-gw-execution-logging-enabled
          - uid: terraform-aws-security-api-gw-require-authentication
          - uid: terraform-aws-security-api-gw-tls
          - uid: terraform-aws-security-api-gw-xray-enabled
      - title: Amazon Elastic Compute Cloud (Amazon EC2)
        filters: |
          asset.platform == "terraform" || asset.platform == "terraform-hcl"
          terraform.providers.any(nameLabel == "aws")
        checks:
          - uid: terraform-aws-security-ec2-ebs-encryption-by-default
          - uid: terraform-aws-security-ec2-imdsv2
          - uid: terraform-aws-security-ec2-user-data-no-secrets
      - title: AWS Identity and Access Management (IAM)
        filters: |
          asset.platform == "terraform" || asset.platform == "terraform-hcl"
          terraform.providers.any(nameLabel == "aws")
        checks:
          - uid: terraform-aws-security-iam-no-wildcards-policies
      - title: Amazon Simple Storage Service (Amazon S3)
        filters: |
          asset.platform == "terraform" || asset.platform == "terraform-hcl"
          terraform.providers.any(nameLabel == "aws")
        checks:
          - uid: terraform-aws-security-s3-bucket-level-public-access-prohibited
          - uid: terraform-aws-security-s3-bucket-logging-enabled
          - uid: terraform-aws-security-s3-bucket-public-read-and-write-prohibited
          - uid: terraform-aws-security-s3-bucket-server-side-encryption-enabled
          - uid: terraform-aws-security-s3-bucket-versioning-enabled
      - title: AWS Elastic Kubernetes Service (EKS) Security for Terraform
        filters: |
          asset.platform == "terraform" || asset.platform == "terraform-hcl"
          terraform.providers.any(nameLabel == "aws")
        checks:
          - uid: terraform-aws-security-eks-encrypt-secrets
          - uid: terraform-aws-security-eks-no-public-cluster-access-to-cidr
queries:
  - uid: terraform-aws-security-no-static-credentials-in-providers
    title: Providers should not contain hard-coded credentials
    mql: |
      terraform.providers.where( nameLabel == "aws" ) {
        arguments["access_key"] == null || arguments["access_key"].find(/(A3T[A-Z0-9]|AKIA|AGPA|AIDA|AROA|AIPA|ANPA|ANVA|ASIA)[A-Z0-9]{16}/).all("AKIAIOSFODNN7EXAMPLE")
        arguments["secret_key"] == null || arguments["secret_key"].find(/([A-Za-z0-9\\\/+\\]{40})/).all( "wJalrXUtnFEMI/A1AAAAA/bPxRfiCYAAAAAAAKEY")
      }
    docs:
      desc: |
        Hard-coded credentials are not recommended in any Terraform configuration, and risks secret leakage should this file ever be committed to a public version control system.
      audit: |
        Check for the existence of hard-coded credentials in the AWS provider

        ```hcl
        provider "aws" {
          region     = "us-west-2"
          access_key = "my-access-key"
          secret_key = "my-secret-key"
        }
        ```
      remediation: |
        The following are more secure alternatives for configuring the AWS provider:

        __Environment Variables__
        You can provide your credentials via the `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` environment variables representing your AWS Access Key and AWS Secret Key, respectively. Note that setting your AWS credentials using either these (or legacy) environment variables will override the use of `AWS_SHARED_CREDENTIALS_FILE` and `AWS_PROFILE`. The `AWS_DEFAULT_REGION` and `AWS_SESSION_TOKEN` environment variables are also used, if applicable:

        ```bash
        $ export AWS_ACCESS_KEY_ID="an_accesskey"
        $ export AWS_SECRET_ACCESS_KEY="a_secretkey"
        $ export AWS_DEFAULT_REGION="us-west-2"
        $ terraform plan
        ```

        ```hcl
        provider "aws" {}
        ```

        __Assumed Role__
        If provided with a role ARN, Terraform will attempt to assume this role using the supplied credentials.

        ```hcl
        provider "aws" {
          assume_role {
            role_arn     = "arn:aws:iam::ACCOUNT_ID:role/ROLE_NAME"
            session_name = "SESSION_NAME"
            external_id  = "EXTERNAL_ID"
          }
        }
        ```
  - uid: terraform-aws-security-api-gw-cache-enabled-and-encrypted
    title: API Gateway must have cache enabled
    mql: |
      terraform.resources.where( nameLabel  == "aws_api_gateway_method_settings") {
        blocks.one(type == "settings" && arguments["cache_data_encrypted"] == true)
      }
    docs:
      desc: Ensure that all methods in Amazon API Gateway stages have cache enabled and cache encrypted
      audit: |
        Check if `cache_data_encrypted` is set to `false`

        ```hcl
        resource "aws_api_gateway_method_settings" "fail_example" {
          rest_api_id = aws_api_gateway_rest_api.example.id
          stage_name  = aws_api_gateway_stage.example.stage_name
          method_path = "path1/GET"

          settings {
            metrics_enabled = true
            logging_level   = "INFO"
            cache_data_encrypted = false
          }
        }
        ```
      remediation: |
        Enable cache encryption by setting `cache_data_encrypted` to `true`

        ```hcl
        resource "aws_api_gateway_method_settings" "good_example" {
          rest_api_id = aws_api_gateway_rest_api.example.id
          stage_name  = aws_api_gateway_stage.example.stage_name
          method_path = "path1/GET"

          settings {
            metrics_enabled = true
            logging_level   = "INFO"
            cache_data_encrypted = true
          }
        }
        ```
  - uid: terraform-aws-security-api-gw-execution-logging-enabled
    title: Ensure that all methods in Amazon API Gateway stage have logging enabled
    mql: |
      terraform.resources.where( nameLabel  == "aws_api_gateway_stage") {
        blocks.one(type == "access_log_settings" && arguments["destination_arn"] != "" )
      }

      terraform.resources.where( nameLabel  == "aws_apigatewayv2_stage") {
        blocks.one(type == "access_log_settings" && arguments["destination_arn"] != "" )
      }
    refs:
      - url: https://docs.aws.amazon.com/config/latest/developerguide/api-gw-execution-logging-enabled.html
        title: AWS Config Managed Rules
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/api_gateway_method_settings#cache_data_encrypted
        title: Terraform Documentation - api_gateway_method_settings Resource
  - uid: terraform-aws-security-api-gw-xray-enabled
    title: Ensure AWS X-Ray tracing is enabled on Amazon API Gateway REST APIs
    mql: |
      terraform.resources.where( nameLabel  == "aws_api_gateway_stage") {
        arguments["xray_tracing_enabled"] == true
      }
    refs:
      - url: https://docs.aws.amazon.com/config/latest/developerguide/api-gw-xray-enabled.html
        title: AWS Config Managed Rules
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/api_gateway_stage#xray_tracing_enabled
        title: Terraform Documentation - api_gateway_stage Resource
  - uid: terraform-aws-security-api-gw-require-authentication
    title: Ensure Authentication for API Gateway methods is activated
    mql: |
      terraform.resources
        .where( nameLabel  == "aws_api_gateway_method" && arguments["authorization"].upcase == "NONE" && arguments["http_method"].upcase != "OPTION" )
        .all(arguments["api_key_required"] == true )
    refs:
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/api_gateway_method#authorization
        title: Terraform Documentation - api_gateway_method Resource
  - uid: terraform-aws-security-api-gw-tls
    title: Ensure that the API Gateway uses a secure SSL/TLS configuration
    mql: |
      terraform.resources.where( nameLabel  == "aws_api_gateway_domain_name") {
        arguments["security_policy"] == "TLS-1-2"
      }
    refs:
      - url: https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-custom-domain-tls-version.html
        title: Choosing a minimum TLS version for a custom domain in API Gateway
      - url: https://docs.aws.amazon.com/config/latest/developerguide/api-gw-ssl-enabled.html
        title: AWS Config Managed Rules
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/api_gateway_domain_name#security_policy
        title: Terraform Documentation - api_gateway_domain_name Resource
  - uid: terraform-aws-security-ec2-ebs-encryption-by-default
    title: Ensure that Amazon Elastic Block Store (EBS) encryption is enabled by default
    mql: |
      terraform.resources.where( nameLabel == "aws_ebs_volume").all(arguments["encrypted"] == true) ||
      terraform.resources.one( nameLabel == "aws_ebs_encryption_by_default" && arguments["enabled"] == true )
    refs:
      - url: https://docs.aws.amazon.com/config/latest/developerguide/ec2-ebs-encryption-by-default.html
        title: AWS Config Managed Rules
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ebs_volume#encrypted
        title: Terraform Documentation - ebs_volume Resource
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ebs_encryption_by_default
        title: Terraform Documentation - ebs_encryption_by_default Resource
  - uid: terraform-aws-security-ec2-imdsv2
    title: Ensure Instance Metadata Service Version 2 (IMDSv2) with session authentication tokens is active
    mql: |
      terraform.resources.where( nameLabel  == "aws_instance") {
        blocks.one(type == "metadata_options")
        blocks.where(type == "metadata_options") {
          arguments["http_tokens"] == "required" || arguments["http_endpoint"] == "disabled"
        }
      }
    refs:
      - url: https://aws.amazon.com/blogs/security/defense-in-depth-open-firewalls-reverse-proxies-ssrf-vulnerabilities-ec2-instance-metadata-service/
        title: Add defense in depth against open firewalls, reverse proxies, and SSRF vulnerabilities with enhancements to the EC2 Instance Metadata Service
      - url: https://docs.aws.amazon.com/config/latest/developerguide/ec2-imdsv2-check.html
        title: AWS Config Managed Rules
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/instance#metadata-options
        title: Terraform Documentation - Metadata Options
  - uid: terraform-aws-security-ec2-user-data-no-secrets
    title: Ensure EC2 instance user data does not contain secrets
    mql: |
      terraform.resources.where( nameLabel  == "aws_instance" && arguments["user_data"] != empty ) {
        # ensure that all used AWS_ACCESS_KEY_ID are the sample key
        arguments["user_data"] {
          _.find(/(A3T[A-Z0-9]|AKIA|AGPA|AIDA|AROA|AIPA|ANPA|ANVA|ASIA)[A-Z0-9]{16}/).all("AKIAIOSFODNN7EXAMPLE")
        }

        # ensure that all used secret keys are the sample key
        arguments["user_data"] {
          _.find(/([A-Za-z0-9\\\/+\\]{40})/).all( "wJalrXUtnFEMI/A1AAAAA/bPxRfiCYAAAAAAAKEY")
        }
      }
    refs:
      - url: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-add-user-data.html
        title: Work with instance user data
      - url: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/user-data.html
        title: Run commands on your Linux instance at launch
      - url: https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/ec2-windows-user-data.html
        title: Run commands on your Windows instance at launch
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/instance#user_data
        title: Terraform Documentation - aws_instance Resource
  - uid: terraform-aws-security-iam-no-wildcards-policies
    title: Ensure IAM policy do not use wildcards and instead apply the principle of least privilege
    mql: |
      # verify aws_iam_policy
      terraform.resources.where( nameLabel  == "aws_iam_policy" && arguments["policy"] != empty  ) {
        arguments["policy"].where( _["Statement"] != empty) {
          _["Statement"] {
            # Resource is either not * or DENY is used (where wildcard is great)
            _["Resource"] != "*" || _["Effect"].upcase == "DENY"
          }
        }
      }

      # verify aws_iam_user_policy
      terraform.resources.where( nameLabel  == "aws_iam_user_policy" && arguments["policy"] != empty  ) {
        arguments["policy"].where( _["Statement"] != empty) {
          _["Statement"] {
            # Resource is either not * or DENY is used (where wildcard is great)
            _["Resource"] != "*" || _["Effect"].upcase == "DENY"
          }
        }
      }

      # verify iam_role_policy
      terraform.resources.where( nameLabel  == "iam_role_policy" && arguments["policy"] != empty  ) {
        arguments["policy"].where( _["Statement"] != empty) {
          _["Statement"] {
            # Resource is either not * or DENY is used (where wildcard is great)
            _["Resource"] != "*" || _["Effect"].upcase == "DENY"
          }
        }
      }

      # verify iam_group_policy
      terraform.resources.where( nameLabel  == "iam_group_policy" && arguments["policy"] != empty  ) {
        arguments["policy"].where( _["Statement"] != empty) {
          _["Statement"] {
            # Resource is either not * or DENY is used (where wildcard is great)
            _["Resource"] != "*" || _["Effect"].upcase == "DENY"
          }
        }
      }
    refs:
      - url: https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html
        title: Security best practices in IAM
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/iam_policy
        title: Terraform Documentation - iam_policy Resource
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/iam_user_policy
        title: Terraform Documentation - iam_user_policy Resource
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/iam_role_policy
        title: Terraform Documentation - iam_role_policy Resource
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/iam_group_policy
        title: Terraform Documentation - iam_group_policy Resource
  - uid: terraform-aws-security-s3-bucket-versioning-enabled
    title: Ensure that versioning is enabled for your S3 buckets
    mql: |
      if ( terraform.settings.requiredProviders["aws"]["version"] == /[~><=\s]+3\./ ) {
        terraform.resources.where( nameLabel == 'aws_s3_bucket') {
          blocks.one(type == 'versioning')
          blocks.where(type == 'versioning') {
            arguments['enabled'] == true
          }
        }
      }
      if ( terraform.settings.requiredProviders["aws"]["version"] == /[~><=\s]+4\./ ) {
        terraform.resources.where( nameLabel == 'aws_s3_bucket').map(labels.last) {
          bucketnames = _
          terraform.resources.where( nameLabel == 'aws_s3_bucket_versioning' && arguments['bucket'].split('.')[1] == bucketnames ) != []
          terraform.resources.where( nameLabel == 'aws_s3_bucket_versioning' && arguments['bucket'].split('.')[1] == bucketnames ) {
            blocks.one( type.downcase == 'versioning_configuration' )
            blocks.where( type.downcase == 'versioning_configuration' ) {
              arguments['status'].downcase == 'enabled'
            }
          }
        }
      }
    refs:
      - url: https://docs.aws.amazon.com/config/latest/developerguide/s3-bucket-versioning-enabled.html
        title: AWS Config Managed Rules
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/s3_bucket
        title: Terraform Documentation - s3_bucket Resource
  - uid: terraform-aws-security-s3-bucket-logging-enabled
    title: Ensure logging is enabled for your S3 buckets
    mql: |
      if ( terraform.settings.requiredProviders["aws"]["version"] == /[~><=\s]+3\./ ) {
        terraform.resources.where( nameLabel == 'aws_s3_bucket') {
          blocks.one( type == 'logging')
          blocks.where(type == 'logging') {
            arguments['target_bucket'] != empty
          }
        }
      }
      if ( terraform.settings.requiredProviders["aws"]["version"] == /[~><=\s]+4\./ ) {
        terraform.resources.where( nameLabel == 'aws_s3_bucket').map(labels.last) {
          bucketnames = _
          terraform.resources.where( nameLabel == 'aws_s3_bucket_logging' && arguments['bucket'].split('.')[1] == bucketnames ) != []
          terraform.resources.where( nameLabel == 'aws_s3_bucket_logging' && arguments['bucket'].split('.')[1] == bucketnames ) {
            arguments['target_bucket'] != empty
          }
        }
      }
    refs:
      - url: https://docs.aws.amazon.com/config/latest/developerguide/s3-bucket-logging-enabled.html
        title: AWS Config Managed Rules
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/s3_bucket
        title: Terraform Documentation - s3_bucket Resource
      - url: https://docs.aws.amazon.com/AmazonS3/latest/userguide/ServerLogs.html
        title: Logging requests using server access logging
  - uid: terraform-aws-security-s3-bucket-level-public-access-prohibited
    title: Ensure Amazon Simple Storage Service (Amazon S3) buckets are not publicly accessible
    mql: |
      terraform.resources.where( nameLabel == 'aws_s3_bucket').map(labels.last) {
        bucketnames = _
        terraform.resources.where( nameLabel == 'aws_s3_bucket_public_access_block' && arguments['bucket'].split('.')[1] == bucketnames ) != []
        terraform.resources.where( nameLabel == 'aws_s3_bucket_public_access_block' && arguments['bucket'].split('.')[1] == bucketnames ) {
          arguments['block_public_acls'] == true
          arguments['block_public_policy'] == true
          arguments['ignore_public_acls'] == true
          arguments['restrict_public_buckets'] == true
        }
      }
    docs:
      desc: |
        [Blocking public access to your Amazon S3 storage](https://docs.aws.amazon.com/AmazonS3/latest/userguide/access-control-block-public-access.html) provides very specific documentation about the various settings for s3 bucket policies.

         - `block_public_acls` - By blocking `public` ACLs, PUT requests will fail if the object has any public ACL defined
         - `ignore_public_acls` - By ignoring the bucket ACL, PUT calls with public ACLs will still work, but public ACL will be ignored
         - `block_public_policy` - Prevents users from putting a policy that enable public access
         - `restrict_public_buckets` - Restricts access to the bucket owner and AWS Services if the bucket has a public policy
      remediation: ""
    refs:
      - url: https://docs.aws.amazon.com/AmazonS3/latest/userguide/access-control-block-public-access.html
        title: Blocking public access to your Amazon S3 storage
      - url: https://docs.aws.amazon.com/config/latest/developerguide/s3-bucket-level-public-access-prohibited.html
        title: AWS Config Managed Rules
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/s3_bucket
        title: Terraform Documentation - s3_bucket Resource
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/s3_bucket_public_access_block#restrict_public_buckets
        title: Terraform Documentation - s3_bucket Resource - restrict_public_buckets Argument
  - uid: terraform-aws-security-s3-bucket-server-side-encryption-enabled
    title: Ensure S3 buckets has the Amazon S3 default encryption enabled
    mql: |
      if ( terraform.settings.requiredProviders["aws"]["version"] == /[~><=\s]+3\./ ) {
        terraform.resources.where( nameLabel == 'aws_s3_bucket') {
          blocks.one( type == "server_side_encryption_configuration" )
          blocks.where( type == "server_side_encryption_configuration" ) {
            blocks.one( _.type == "rule" && _.blocks.one( type == 'apply_server_side_encryption_by_default' ))
          }
        }
      }
      if ( terraform.settings.requiredProviders["aws"]["version"] == /[~><=\s]+4\./ ) {
        terraform.resources.where( nameLabel == 'aws_s3_bucket_server_side_encryption_configuration') {
          blocks.one( type == "rule" )
          blocks.where( type == "rule" ) {
            blocks.one( _.type == 'apply_server_side_encryption_by_default' )
          }
        }
      }
    docs:
      desc: |
        Amazon S3 default encryption is an optional configuration that sets the default encryption behavior for an S3 bucket. Enabling default SSE configures S3 buckets so that all new objects are encrypted when they are stored in the bucket. The objects are encrypted using server-side encryption with either Amazon S3-managed keys (SSE-S3) or AWS KMS keys stored in AWS Key Management Service (AWS KMS) (SSE-KMS).

        Enabling SSE by default reduces the risk of unauthorized access to objects stored in the bucket.
      remediation: ""
    refs:
      - url: https://docs.aws.amazon.com/AmazonS3/latest/userguide/bucket-encryption.html
        title: Setting default server-side encryption behavior for Amazon S3 buckets
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/s3_bucket
        title: Terraform Documentation - s3_bucket Resource
      - url: https://docs.aws.amazon.com/config/latest/developerguide/s3-bucket-server-side-encryption-enabled.html
        title: AWS Config Managed Rules
  - uid: terraform-aws-security-s3-bucket-public-read-and-write-prohibited
    title: Ensure Amazon S3 buckets do not allow public read access
    mql: |
      if ( terraform.settings.requiredProviders["aws"]["version"] == /[~><=\s]+3\./ ) {
        terraform.resources.where( nameLabel == 'aws_s3_bucket') {
          arguments['acl'] != /public-read/
        }
      }
      if ( terraform.settings.requiredProviders["aws"]["version"] == /[~><=\s]+4\./ ) {
        terraform.resources.where( nameLabel == 'aws_s3_bucket').map(labels.last) {
          bucketnames = _
          terraform.resources.where( nameLabel == 'aws_s3_bucket_acl' && arguments['bucket'].split('.')[1] == bucketnames ) != []
          terraform.resources.where( nameLabel == 'aws_s3_bucket_acl' && arguments['bucket'].split('.')[1] == bucketnames ) {
            arguments['acl'].downcase != /public-read/
          }
        }
      }
    refs:
      - url: https://docs.aws.amazon.com/config/latest/developerguide/s3-bucket-public-read-prohibited.html
        title: AWS Config Managed Rules - public read
      - url: https://docs.aws.amazon.com/config/latest/developerguide/s3-bucket-public-write-prohibited.html
        title: AWS Config Managed Rules - public write
      - url: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/s3_bucket#acl
        title: Terraform Documentation - s3_bucket Resource - acl Argument
  - uid: terraform-aws-security-eks-encrypt-secrets
    title: EKS should have the encryption of secrets enabled
    mql: |
      terraform.resources.where( nameLabel == "aws_eks_cluster" ) {
        blocks.one( type == "encryption_config" )
      }
    docs:
      desc: |
        EKS cluster resources should have the encryption_config block set with protection of the secrets resource.

        __Possible Impact__

        EKS secrets could be read if compromised

        __Suggested Resolution__

        Enable encryption of EKS secrets
      audit: |
        The following example will fail the `eks-encrypt-secrets` check:

        ```hcl
        resource "aws_eks_cluster" "bad_example" {
          name = "bad_example_cluster"

          role_arn = var.cluster_arn
          vpc_config {
              endpoint_public_access = false
          }
        }
        ```
      remediation: |
        The following example will pass the `eks-encrypt-secrets` check:

        ```hcl
        resource "aws_eks_cluster" "good_example" {
          encryption_config {
              resources = [ "secrets" ]
              provider {
                  key_arn = var.kms_arn
              }
          }

          name = "good_example_cluster"
          role_arn = var.cluster_arn
          vpc_config {
              endpoint_public_access = false
          }
        }
        ```
  - uid: terraform-aws-security-eks-no-public-cluster-access-to-cidr
    title: EKS Clusters should restrict access to public API server
    mql: |-
      terraform.resources.where( nameLabel == "aws_eks_cluster" ) {
        blocks.where( type == "vpc_config" ) {
          arguments['endpoint_public_access'] == false || arguments['public_access_cidrs'].none( "0.0.0.0/0")
        }
      }
    docs:
      desc: |
        EKS Clusters have public access CIDRs set to 0.0.0.0/0 by default which is wide open to the internet. This should be explicitly set to a more specific private CIDR range.

        __Possible Impact__

        EKS can be accessed from the internet

        __Suggested Resolution__

        Don't enable public access to EKS Clusters.
      audit: |
        The following example will fail the eks-no-public-cluster-access-to-cidr check.

        ```hcl
        resource "aws_eks_cluster" "bad_example" {

          name = "bad_example_cluster"
          role_arn = var.cluster_arn
          vpc_config {
            endpoint_public_access = true
          }
        }
        ```
      remediation: |
        The following example will pass the eks-no-public-cluster-access-to-cidr check:

        ```hcl
        resource "aws_eks_cluster" "good_example" {
          name = "good_example_cluster"
          role_arn = var.cluster_arn
          vpc_config {
            endpoint_public_access = true
            public_access_cidrs = ["10.2.0.0/8"]
          }
        }
        ```