Elasticsearch encryption with KMS disabled

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Metadata

Id: cloudformation-aws-elasticsearch-domain-encryption-with-kms-disabled

Provider: AWS

Platform: CloudFormation

Severity: High

Category: Encryption

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Description

Elasticsearch domains must use AWS KMS-backed encryption at rest to protect indexed data, snapshots, and backups from unauthorized access and to provide customer control and auditability of encryption keys.

In CloudFormation, the AWS::Elasticsearch::Domain resource must include the EncryptionAtRestOptions property with KmsKeyId defined and not null. Resources missing EncryptionAtRestOptions or with EncryptionAtRestOptions.KmsKeyId undefined will be flagged. The KmsKeyId value should reference a customer-managed AWS KMS key ARN or a Ref to an AWS::KMS::Key, rather than relying solely on the service default key.

Secure configuration example:

MyDomain:
  Type: AWS::Elasticsearch::Domain
  Properties:
    DomainName: my-domain
    EncryptionAtRestOptions:
      Enabled: true
      KmsKeyId: !Ref MyKmsKey

MyKmsKey:
  Type: AWS::KMS::Key
  Properties:
    Description: KMS key for Elasticsearch encryption

Compliant Code Examples

AWSTemplateFormatVersion: "2010-09-09"
Description: Creates RDS Cluster
Resources:
  ElasticsearchDomain:
    Type: AWS::Elasticsearch::Domain
    Properties:
      DomainName: "test"
      ElasticsearchClusterConfig:
        DedicatedMasterEnabled: "true"
        InstanceCount: "2"
        ZoneAwarenessEnabled: "true"
        InstanceType: "m3.medium.elasticsearch"
        DedicatedMasterType: "m3.medium.elasticsearch"
        DedicatedMasterCount: "3"
      EncryptionAtRestOptions:
        Enabled: true
        KmsKeyId: "some-kms-key-id"
      EBSOptions:
        EBSEnabled: true
        Iops: 0
        VolumeSize: 20
        VolumeType: "gp2"
      SnapshotOptions:
        AutomatedSnapshotStartHour: "0"
      AccessPolicies:
        Version: "2012-10-17"
        Statement:
          -
            Effect: "Allow"
            Principal:
              AWS: "arn:aws:iam::123456789012:user/es-user"
            Action: "es:*"
            Resource: "arn:aws:es:us-east-1:846973539254:domain/test/*"
      AdvancedOptions:
        rest.action.multi.allow_explicit_index: "true"

Non-Compliant Code Examples

AWSTemplateFormatVersion: "2010-09-09"
Description: Creates RDS Cluster
Resources:
  ElasticsearchDomain:
    Type: AWS::Elasticsearch::Domain
    Properties:
      DomainName: "test"
      ElasticsearchClusterConfig:
        DedicatedMasterEnabled: "true"
        InstanceCount: "2"
        ZoneAwarenessEnabled: "true"
        InstanceType: "m3.medium.elasticsearch"
        DedicatedMasterType: "m3.medium.elasticsearch"
        DedicatedMasterCount: "3"
      EncryptionAtRestOptions:
        Enabled: true
      EBSOptions:
        EBSEnabled: true
        Iops: 0
        VolumeSize: 20
        VolumeType: "gp2"
      SnapshotOptions:
        AutomatedSnapshotStartHour: "0"
      AccessPolicies:
        Version: "2012-10-17"
        Statement:
          -
            Effect: "Allow"
            Principal:
              AWS: "arn:aws:iam::123456789012:user/es-user"
            Action: "es:*"
            Resource: "arn:aws:es:us-east-1:846973539254:domain/test/*"
      AdvancedOptions:
        rest.action.multi.allow_explicit_index: "true"

AWSTemplateFormatVersion: "2010-09-09"
Description: Creates RDS Cluster2
Resources:
  ElasticsearchDomain:
    Type: AWS::Elasticsearch::Domain
    Properties:
      DomainName: "test"
      ElasticsearchClusterConfig:
        DedicatedMasterEnabled: "true"
        InstanceCount: "2"
        ZoneAwarenessEnabled: "true"
        InstanceType: "m3.medium.elasticsearch"
        DedicatedMasterType: "m3.medium.elasticsearch"
        DedicatedMasterCount: "3"
      EBSOptions:
        EBSEnabled: true
        Iops: 0
        VolumeSize: 20
        VolumeType: "gp2"
      SnapshotOptions:
        AutomatedSnapshotStartHour: "0"
      AccessPolicies:
        Version: "2012-10-17"
        Statement:
          -
            Effect: "Allow"
            Principal:
              AWS: "arn:aws:iam::123456789012:user/es-user"
            Action: "es:*"
            Resource: "arn:aws:es:us-east-1:846973539254:domain/test/*"
      AdvancedOptions:
        rest.action.multi.allow_explicit_index: "true"