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AwsCommunity::KMS::EncryptionSettings

Overview

This hook for AWS CloudFormation performs policy-as-code validation of AWS Key Management Service (AWS KMS) encryption-related, user-provided configuration settings for a number of AWS resources with which KMS integrates that are supported in this hook.

This hook also includes configuration options that you can choose to enable/use to perform additional validation operations (for example, determine if EBS Encryption by default is enabled for your account in the current Region, whether to validate the BlockDeviceMapping encryption settings of an Amazon Machine Image (AMI) ID you specify).

Supported resource types and properties in this hook

AWS resource types and properties supported in this hook include the following (see also the configuration options section shown next in this document):

Usage

To get started, follow the steps shown next:

  • Install Apache Maven, that you'll need to build this hook that uses Java. You'll also need to install the JDK 8 or JDK 11; for more information, see Prerequisites for developing hooks.
  • Install the CloudFormation CLI.
  • Run the following commands to build and submit it as a private extension to the CloudFormation registry in the AWS region(s) of your choice. The following example uses the us-east-1 region; you will need to make a separate cfn submit registry submission for each region you want to use (alternatively, see Hook registry submission with StackSets to submit the hook as a private extension to the registry in multiple regions with one operation):
cfn generate && mvn clean verify && cfn submit --set-default --region us-east-1
  • Configure this hook: create a type_config.json file as shown next (for more information on Properties defined for this hook, see Configuration options):
cat <<EOF > type_config.json
{
    "CloudFormationConfiguration": {
        "HookConfiguration": {
            "TargetStacks": "ALL",
            "FailureMode": "FAIL",
            "Properties": {
                "UseGetEbsEncryptionByDefaultAsFallback": "no",
                "ValidateAmiBlockDeviceMappingEncryptionSettings": "no",
                "ValidateBucketKeyEnabled": "no"
            }
        }
    }
}
EOF
  • By default, all the supported resource type targets in this hook are included. You can, optionally, choose to only include the supported targets you require (thus, excluding the others) by adding the TargetFilters section to the type configuration that you will apply (as shown later on in this file). For example, if you only want to trigger the hook for AWS::S3::Bucket and AWS::SQS::Queue resource types on pre-create and pre-update operations, add the TargetFilters section as follows (for more information on configuring hooks, see the Hooks structure page):
{
    "CloudFormationConfiguration": {
        "HookConfiguration": {
            "TargetStacks": "ALL",
            "FailureMode": "FAIL",
            "Properties": {
                [...omitted for brevity...]
            },
            "TargetFilters":{
                "TargetNames": [
                    "AWS::S3::Bucket",
                    "AWS::SQS::Queue"
                ],
                "Actions": [
                    "CREATE",
                    "UPDATE"
                ],
                "InvocationPoints": [
                    "PRE_PROVISION"
                ]
            }
        }
    }
}
aws cloudformation list-types \
  --type HOOK \
  --filters TypeNamePrefix=AwsCommunity::KMS::EncryptionSettings \
  --query 'TypeSummaries[?TypeName==`AwsCommunity::KMS::EncryptionSettings`].TypeArn' \
  --output text
  • Find the ARN in the output of the command above, and use it with this command you'll run next:
aws cloudformation set-type-configuration \
  --configuration file://type_config.json \
  --type-arn 'YOUR_HOOK_ARN'

Configuration options

UseGetEbsEncryptionByDefaultAsFallback

Whether or not to instruct this hook to call the GetEbsEncryptionByDefault API to determine if EBS Encryption by default is enabled for your account in the current Region. If EBS encryption by default is enabled for your account in the current Region, this hook does not perform additional policy-as-code validation checks for a number of resource type properties, except for certain regular expression pattern checks (such as for this KmsKeyId property values) or for certain missing mandatory property checks (such as for LaunchTemplateData property values).

For more information on which resource type properties use this configuration option, see Supported resource types and properties in this hook. If you wish to activate this policy-as-code validation as a fallback strategy, choose yes; otherwise, choose no (default).

ValidateAmiBlockDeviceMappingEncryptionSettings

When you specify an Amazon Machine Image (AMI) ID for the ImageId property of resource types such as AWS::AutoScaling::LaunchConfiguration, AWS::EC2::Instance, and AWS::EC2::LaunchTemplate, or when this hook determines the AMI ID via the instance ID property value by calling e.g., the DescribeInstances EC2 API (for example, the InstanceId property), whether to validate the BlockDeviceMapping encryption settings of the AMI. If you wish to activate this policy-as-code validation check, choose yes; otherwise, choose no (default).

ValidateBucketKeyEnabled

Whether to validate if the BucketKeyEnabled property for the Amazon S3 bucket resource type is set to true. If you wish to activate this policy-as-code validation check, choose yes; otherwise, choose no (default).

Hook registry submission with StackSets

This section will guide you through the process of submitting the hook to the registry as a private extension using AWS CloudFormation StackSets, to multiple regions with one operation.

To get started, use the command below to build and package the hook in an awscommunity-kms-encryptionsettings.zip ZIP archive:

mvn clean verify && cfn submit --dry-run

Upload the ZIP archive to a bucket you own; later on, you'll need to reference the object URL of this ZIP file you uploaded, so make a note of it.

Following steps assume you'll choose to use the self-managed permissions to operate with StackSets. To get started, prepare your account by following Prerequisites for stack set operations: follow steps in Set up basic permissions for stack set operations, and create both the AWSCloudFormationStackSetAdministrationRole and AWSCloudFormationStackSetExecutionRole resources in your account.

Once ready, you'll use the AWS CloudFormation console to Create a stack set, for which you'll choose to use self-managed permissions:

  • In the CloudFormation console, choose StackSets.
  • Choose Create StackSet.
  • In the Choose a template page, choose Self-service permissions.
  • Specify the admin IAM role name you created earlier: AWSCloudFormationStackSetAdministrationRole.
  • Specify the IAM execution role name you created earlier: AWSCloudFormationStackSetExecutionRole.
  • Go to the Prerequisite - Prepare template section.
  • Choose Template is ready.
  • Specify the template to use in the Specify template section: choose to upload the templates/private-registry-submit.yaml template; alternatively, first upload the template to a bucket you own, and then provide the Amazon S3 template URL. Note that by using this template you'll also create a KMS key for each region you'll choose, and use each key with Amazon CloudWatch Logs log group resources that the template describes: whilst you are not required to use KMS with log group resources, the template describes a key for such resources so that the AwsCommunity::KMS::EncryptionSettings hook will find them to be compliant (this hook encompasses log groups) as you update the stack set in the future.
  • Choose Next.
  • In Specify StackSet details, specify the StackSet name and description.
  • In Parameters, specify values you need. In SchemaHandlerPackage parameter, specify the object URL of the ZIP archive you uploaded earlier. Choose Next.
  • In Execution configuration, choose the Active managed execution. Choose Next.
  • In Accounts, specify your AWS account ID in Account numbers.
  • In the Regions section, specify the regions you need.
  • In Deployment options, choose Parallel for Region Concurrency. Choose Next.
  • In the Review page, review your choices, and select I acknowledge that AWS CloudFormation might create IAM resources.
  • Choose Submit to start the StackSet creation process.

Example templates

Templates in this section are marked as:

  • Non-compliant: this hook will find the given template to be non-compliant, and
  • Compliant: the template will be found to be compliant, and should deploy successfully.

Notes:

  • example templates shown next:
    • assume this hook is configured with the default Configuration options values;
    • might include additional resource types on which a target resource would depend on, and that are added here to show additional context;
  • there are also templates called integ-succeed.yml and integ-fail.yml in the test directory, that can be used to create a stack for testing: resources described in these templates are expected to be created either successfully or not, respectively.

AWS::AutoScaling::LaunchConfiguration

Non-compliant (Encrypted in BlockDeviceMappings is set to false):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Parameters:
  LaunchConfigurationInstanceType:
    Description: Amazon EC2 instance type to use for the LaunchConfiguration resource.
    Type: String
    AllowedValues:
      - a1.large
    Default: a1.large
  LatestAmiId:
    Description: Region-specific image to use.
    Type: AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>
    Default: /aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2
Resources:
  LaunchConfiguration:
    Type: AWS::AutoScaling::LaunchConfiguration
    Properties:
      BlockDeviceMappings:
        - DeviceName: /dev/sdm
          Ebs:
            Encrypted: false
            VolumeSize: 1
            VolumeType: gp3
        - DeviceName: /dev/sdk
          Ebs:
            Encrypted: false
            VolumeSize: 1
            VolumeType: gp3
      ImageId: !Ref 'LatestAmiId'
      InstanceType: !Ref 'LaunchConfigurationInstanceType'

Compliant (Encrypted in BlockDeviceMappings is set to true):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Parameters:
  LaunchConfigurationInstanceType:
    Description: Amazon EC2 instance type to use for the LaunchConfiguration resource.
    Type: String
    AllowedValues:
      - a1.large
    Default: a1.large
  LatestAmiId:
    Description: Region-specific image to use.
    Type: AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>
    Default: /aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2
Resources:
  LaunchConfiguration:
    Type: AWS::AutoScaling::LaunchConfiguration
    Properties:
      BlockDeviceMappings:
        - DeviceName: /dev/sdm
          Ebs:
            Encrypted: true
            VolumeSize: 1
            VolumeType: gp3
        - DeviceName: /dev/sdk
          Ebs:
            Encrypted: true
            VolumeSize: 1
            VolumeType: gp3
      ImageId: !Ref 'LatestAmiId'
      InstanceType: !Ref 'LaunchConfigurationInstanceType'

AWS::CloudTrail::Trail

Note that in the example shown next the IsLogging property is set to false to turn off logging for this test-only use case; independently of the setting of this property, CloudTrail will create an S3 object whose prefix starts with AWSLogs/YOUR_ACCOUNT_ID/CloudTrail/.

Non-compliant (the AWS::CloudTrail::Trail resource type is not set up to use KMSKeyId):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  CloudTrailTrail:
    Type: AWS::CloudTrail::Trail
    Properties:
      EventSelectors:
        - IncludeManagementEvents: true
          ReadWriteType: All
      IsLogging: false
      S3BucketName: !Ref 'CloudTrailTrailS3Bucket'
      TrailName: !Sub '${AWS::Partition}-${AWS::AccountId}-${AWS::Region}-test-only-trail'
  CloudTrailTrailS3Bucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketEncryption:
        ServerSideEncryptionConfiguration:
          - ServerSideEncryptionByDefault:
              SSEAlgorithm: aws:kms
  CloudTrailTrailS3BucketPolicy:
    Type: AWS::S3::BucketPolicy
    Properties:
      Bucket: !Ref 'CloudTrailTrailS3Bucket'
      PolicyDocument:
        Statement:
          - Action: s3:GetBucketAcl
            Condition:
              StringEquals:
                AWS:SourceArn: !Sub 'arn:${AWS::Partition}:cloudtrail:${AWS::Region}:${AWS::AccountId}:trail/${AWS::Partition}-${AWS::AccountId}-${AWS::Region}-test-only-trail'
            Effect: Allow
            Principal:
              Service: cloudtrail.amazonaws.com
            Resource: !GetAtt CloudTrailTrailS3Bucket.Arn
            Sid: AWSCloudTrailAclCheck20150319
          - Action: s3:PutObject
            Condition:
              StringEquals:
                AWS:SourceArn: !Sub 'arn:${AWS::Partition}:cloudtrail:${AWS::Region}:${AWS::AccountId}:trail/${AWS::Partition}-${AWS::AccountId}-${AWS::Region}-test-only-trail'
                s3:x-amz-acl: bucket-owner-full-control
            Effect: Allow
            Principal:
              Service: cloudtrail.amazonaws.com
            Resource: !Sub '${CloudTrailTrailS3Bucket.Arn}/AWSLogs/${AWS::AccountId}/*'
            Sid: AWSCloudTrailWrite20150319
        Version: "2012-10-17"

Note that in the example shown next:

  • the IsLogging property is set to false to turn off logging for this test-only use case; independently of the setting of this property, CloudTrail will create an S3 object whose prefix starts with AWSLogs/YOUR_ACCOUNT_ID/CloudTrail/;
  • an example KMS key policy is shown; for more information, see Configure AWS KMS key policies for CloudTrail.

Compliant (the AWS::CloudTrail::Trail resource type is set up to use KMSKeyId):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  CloudTrailTrailKmsKey:
    Type: AWS::KMS::Key
    Properties:
      EnableKeyRotation: true
      KeyPolicy:
        Id: key-default-1
        Statement:
          - Action: kms:*
            Effect: Allow
            Principal:
              AWS: !Sub 'arn:${AWS::Partition}:iam::${AWS::AccountId}:root'
            Resource: '*'
            Sid: Enable IAM User Permissions
          - Action: kms:GenerateDataKey*
            Condition:
              StringEquals:
                AWS:SourceArn: !Sub 'arn:${AWS::Partition}:cloudtrail:${AWS::Region}:${AWS::AccountId}:trail/${AWS::Partition}-${AWS::AccountId}-${AWS::Region}-test-only-trail'
              StringLike:
                kms:EncryptionContext:aws:cloudtrail:arn: !Sub 'arn:${AWS::Partition}:cloudtrail:*:${AWS::AccountId}:trail/*'
            Effect: Allow
            Principal:
              Service: cloudtrail.amazonaws.com
            Resource: '*'
            Sid: Allow CloudTrail to encrypt logs
          - Action: kms:DescribeKey
            Effect: Allow
            Principal:
              Service: cloudtrail.amazonaws.com
            Resource: '*'
            Sid: Allow CloudTrail to describe key
          - Action:
              - kms:Decrypt
              - kms:ReEncryptFrom
            Condition:
              StringEquals:
                kms:CallerAccount: !Ref 'AWS::AccountId'
              StringLike:
                kms:EncryptionContext:aws:cloudtrail:arn: !Sub 'arn:${AWS::Partition}:cloudtrail:*:${AWS::AccountId}:trail/*'
            Effect: Allow
            Principal:
              AWS: '*'
            Resource: '*'
            Sid: Allow principals in the account to decrypt log files
        Version: "2012-10-17"
      PendingWindowInDays: 7
  CloudTrailTrail:
    Type: AWS::CloudTrail::Trail
    Properties:
      EventSelectors:
        - IncludeManagementEvents: true
          ReadWriteType: All
      IsLogging: false
      KMSKeyId: !Ref 'CloudTrailTrailKmsKey'
      S3BucketName: !Ref 'CloudTrailTrailS3Bucket'
      TrailName: !Sub '${AWS::Partition}-${AWS::AccountId}-${AWS::Region}-test-only-trail'
  CloudTrailTrailS3Bucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketEncryption:
        ServerSideEncryptionConfiguration:
          - ServerSideEncryptionByDefault:
              SSEAlgorithm: aws:kms
  CloudTrailTrailS3BucketPolicy:
    Type: AWS::S3::BucketPolicy
    Properties:
      Bucket: !Ref 'CloudTrailTrailS3Bucket'
      PolicyDocument:
        Statement:
          - Action: s3:GetBucketAcl
            Condition:
              StringEquals:
                AWS:SourceArn: !Sub 'arn:${AWS::Partition}:cloudtrail:${AWS::Region}:${AWS::AccountId}:trail/${AWS::Partition}-${AWS::AccountId}-${AWS::Region}-test-only-trail'
            Effect: Allow
            Principal:
              Service: cloudtrail.amazonaws.com
            Resource: !GetAtt CloudTrailTrailS3Bucket.Arn
            Sid: AWSCloudTrailAclCheck20150319
          - Action: s3:PutObject
            Condition:
              StringEquals:
                AWS:SourceArn: !Sub 'arn:${AWS::Partition}:cloudtrail:${AWS::Region}:${AWS::AccountId}:trail/${AWS::Partition}-${AWS::AccountId}-${AWS::Region}-test-only-trail'
                s3:x-amz-acl: bucket-owner-full-control
            Effect: Allow
            Principal:
              Service: cloudtrail.amazonaws.com
            Resource: !Sub '${CloudTrailTrailS3Bucket.Arn}/AWSLogs/${AWS::AccountId}/*'
            Sid: AWSCloudTrailWrite20150319
        Version: "2012-10-17"

AWS::DynamoDB::GlobalTable

Non-compliant (SSESpecification properties are missing):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  DynamoDbGlobalTable:
    Type: AWS::DynamoDB::GlobalTable
    Properties:
      AttributeDefinitions:
        - AttributeName: Book
          AttributeType: S
        - AttributeName: Author
          AttributeType: S
      BillingMode: PAY_PER_REQUEST
      KeySchema:
        - AttributeName: Book
          KeyType: HASH
        - AttributeName: Author
          KeyType: RANGE
      Replicas:
        - Region: !Ref 'AWS::Region'
          TableClass: STANDARD

Compliant (SSESpecification properties are present, and are set up to use KMS encryption):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  DynamoDbGlobalTable:
    Type: AWS::DynamoDB::GlobalTable
    Properties:
      AttributeDefinitions:
        - AttributeName: Book
          AttributeType: S
        - AttributeName: Author
          AttributeType: S
      BillingMode: PAY_PER_REQUEST
      KeySchema:
        - AttributeName: Book
          KeyType: HASH
        - AttributeName: Author
          KeyType: RANGE
      Replicas:
        - Region: !Ref 'AWS::Region'
          TableClass: STANDARD
      SSESpecification:
        SSEEnabled: true
        SSEType: KMS

AWS::DynamoDB::Table

Non-compliant (SSESpecification properties are missing):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  DynamoDbTable:
    Type: AWS::DynamoDB::Table
    Properties:
      AttributeDefinitions:
        - AttributeName: Book
          AttributeType: S
        - AttributeName: Author
          AttributeType: S
      KeySchema:
        - AttributeName: Book
          KeyType: HASH
        - AttributeName: Author
          KeyType: RANGE
      ProvisionedThroughput:
        ReadCapacityUnits: 1
        WriteCapacityUnits: 1

Compliant (SSESpecification properties are present, and are set up to use KMS encryption):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  DynamoDbTable:
    Type: AWS::DynamoDB::Table
    Properties:
      AttributeDefinitions:
        - AttributeName: Book
          AttributeType: S
        - AttributeName: Author
          AttributeType: S
      KeySchema:
        - AttributeName: Book
          KeyType: HASH
        - AttributeName: Author
          KeyType: RANGE
      ProvisionedThroughput:
        ReadCapacityUnits: 1
        WriteCapacityUnits: 1
      SSESpecification:
        SSEEnabled: true
        SSEType: KMS

AWS::EC2::Instance

Non-compliant (Encrypted in BlockDeviceMappings is set to false):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Parameters:
  InstanceType:
    Description: Amazon EC2 instance type to use.
    Type: String
    AllowedValues:
      - t2.micro
      - t2.small
    Default: t2.micro
  LatestAmiId:
    Description: Region-specific image to use.
    Type: AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>
    Default: /aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2
Resources:
  Instance:
    Type: AWS::EC2::Instance
    Properties:
      BlockDeviceMappings:
        - DeviceName: /dev/sdm
          Ebs:
            Encrypted: false
            VolumeSize: 1
            VolumeType: gp3
        - DeviceName: /dev/sdk
          Ebs:
            Encrypted: false
            VolumeSize: 1
            VolumeType: gp3
      ImageId: !Ref 'LatestAmiId'
      InstanceType: !Ref 'InstanceType'

Compliant (Encrypted in BlockDeviceMappings is set to true):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Parameters:
  InstanceType:
    Description: Amazon EC2 instance type to use.
    Type: String
    AllowedValues:
      - t2.micro
      - t2.small
    Default: t2.micro
  LatestAmiId:
    Description: Region-specific image to use.
    Type: AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>
    Default: /aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2
Resources:
  Instance:
    Type: AWS::EC2::Instance
    Properties:
      BlockDeviceMappings:
        - DeviceName: /dev/sdm
          Ebs:
            Encrypted: true
            VolumeSize: 1
            VolumeType: gp3
        - DeviceName: /dev/sdk
          Ebs:
            Encrypted: true
            VolumeSize: 1
            VolumeType: gp3
      ImageId: !Ref 'LatestAmiId'
      InstanceType: !Ref 'InstanceType'

AWS::EC2::LaunchTemplate

Non-compliant (Encrypted in BlockDeviceMappings is set to false):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Parameters:
  InstanceType:
    Description: Amazon EC2 instance type to use.
    Type: String
    AllowedValues:
      - t2.micro
      - t2.small
    Default: t2.micro
  LatestAmiId:
    Description: Region-specific image to use.
    Type: AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>
    Default: /aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2
Resources:
  LaunchTemplate:
    Type: AWS::EC2::LaunchTemplate
    Properties:
      LaunchTemplateData:
        BlockDeviceMappings:
          - DeviceName: /dev/sdm
            Ebs:
              Encrypted: false
              VolumeSize: 1
              VolumeType: gp3
          - DeviceName: /dev/sdk
            Ebs:
              Encrypted: false
              VolumeSize: 1
              VolumeType: gp3
        ImageId: !Ref 'LatestAmiId'
        InstanceType: !Ref 'InstanceType'

Compliant (Encrypted in BlockDeviceMappings is set to true):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Parameters:
  InstanceType:
    Description: Amazon EC2 instance type to use.
    Type: String
    AllowedValues:
      - t2.micro
      - t2.small
    Default: t2.micro
  LatestAmiId:
    Description: Region-specific image to use.
    Type: AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>
    Default: /aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2
Resources:
  LaunchTemplate:
    Type: AWS::EC2::LaunchTemplate
    Properties:
      LaunchTemplateData:
        BlockDeviceMappings:
          - DeviceName: /dev/sdm
            Ebs:
              Encrypted: true
              VolumeSize: 1
              VolumeType: gp3
          - DeviceName: /dev/sdk
            Ebs:
              Encrypted: true
              VolumeSize: 1
              VolumeType: gp3
        ImageId: !Ref 'LatestAmiId'
        InstanceType: !Ref 'InstanceType'

AWS::EC2::Volume

Non-compliant (Encrypted is set to false):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  Volume:
    Type: AWS::EC2::Volume
    Properties:
      AvailabilityZone: !Sub '${AWS::Region}a'
      Encrypted: false
      Size: 1

Compliant (Encrypted is set to true):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  Volume:
    Type: AWS::EC2::Volume
    Properties:
      AvailabilityZone: !Sub '${AWS::Region}a'
      Encrypted: true
      Size: 1

AWS::EFS::FileSystem

Non-compliant (Encrypted is missing):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  EfsFileSystem:
    Type: AWS::EFS::FileSystem

Compliant (Encrypted is set to true):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  EfsFileSystem:
    Type: AWS::EFS::FileSystem
    Properties:
      Encrypted: true

AWS::Kinesis::Stream

Non-compliant (StreamEncryption properties are missing):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  KinesisStream:
    Type: AWS::Kinesis::Stream
    Properties:
      ShardCount: 1

Compliant (StreamEncryption properties are present, and are set up to use KMS encryption):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  KinesisStream:
    Type: AWS::Kinesis::Stream
    Properties:
      ShardCount: 1
      StreamEncryption:
        EncryptionType: KMS
        KeyId: alias/aws/kinesis

AWS::Logs::LogGroup

Non-compliant (the AWS::Logs::LogGroup resource type is not set up to use KmsKeyId):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  LogsLogGroup:
    Type: AWS::Logs::LogGroup

Compliant (the AWS::Logs::LogGroup resource type is set up to use KmSKeyId. Note that the example below uses a sample configuration for the KMS key; for more information on configuration options you can use, see Encrypt log data in CloudWatch Logs using AWS Key Management Service and AWS::KMS::Key):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  LogsLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      KmsKeyId: !GetAtt LogsLogGroupKmsKey.Arn
      RetentionInDays: 365
  LogsLogGroupKmsKey:
    Type: AWS::KMS::Key
    Properties:
      EnableKeyRotation: true
      KeyPolicy:
        Id: key-default-1
        Statement:
          - Action: kms:*
            Effect: Allow
            Principal:
              AWS: !Sub 'arn:${AWS::Partition}:iam::${AWS::AccountId}:root'
            Resource: '*'
            Sid: Enable IAM User Permissions
          - Action:
              - kms:Decrypt*
              - kms:Describe*
              - kms:Encrypt*
              - kms:GenerateDataKey*
              - kms:ReEncrypt*
            Condition:
              ArnLike:
                kms:EncryptionContext:aws:logs:arn: !Sub 'arn:${AWS::Partition}:logs:${AWS::Region}:${AWS::AccountId}:*'
            Effect: Allow
            Principal:
              Service: !Sub 'logs.${AWS::Region}.amazonaws.com'
            Resource: '*'
        Version: "2012-10-17"
      PendingWindowInDays: 7

AWS::RDS::DBCluster

Non-compliant (StorageEncrypted for the AWS::RDS::DBCluster resource type is missing):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  RdsDbCluster:
    Type: AWS::RDS::DBCluster
    Properties:
      Engine: aurora
      MasterUserPassword: !Sub '{{resolve:secretsmanager:${RdsDbClusterSecretsManagerSecret}::password}}'
      MasterUsername: !Sub '{{resolve:secretsmanager:${RdsDbClusterSecretsManagerSecret}::username}}'
  RdsDbClusterSecretsManagerSecret:
    Type: AWS::SecretsManager::Secret
    Properties:
      GenerateSecretString:
        ExcludeCharacters: '"@/'
        GenerateStringKey: password
        PasswordLength: 30
        SecretStringTemplate: '{"username": "admin"}'
  RdsDbClusterSecretsManagerSecretAttachment:
    Type: AWS::SecretsManager::SecretTargetAttachment
    Properties:
      SecretId: !Ref 'RdsDbClusterSecretsManagerSecret'
      TargetId: !Ref 'RdsDbCluster'
      TargetType: AWS::RDS::DBCluster

Compliant (StorageEncrypted for the AWS::RDS::DBCluster resource type is set to true):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  RdsDbCluster:
    Type: AWS::RDS::DBCluster
    Properties:
      Engine: aurora
      MasterUserPassword: !Sub '{{resolve:secretsmanager:${RdsDbClusterSecretsManagerSecret}::password}}'
      MasterUsername: !Sub '{{resolve:secretsmanager:${RdsDbClusterSecretsManagerSecret}::username}}'
      StorageEncrypted: true
  RdsDbClusterSecretsManagerSecret:
    Type: AWS::SecretsManager::Secret
    Properties:
      GenerateSecretString:
        ExcludeCharacters: '"@/'
        GenerateStringKey: password
        PasswordLength: 30
        SecretStringTemplate: '{"username": "admin"}'
  RdsDbClusterSecretsManagerSecretAttachment:
    Type: AWS::SecretsManager::SecretTargetAttachment
    Properties:
      SecretId: !Ref 'RdsDbClusterSecretsManagerSecret'
      TargetId: !Ref 'RdsDbCluster'
      TargetType: AWS::RDS::DBCluster

AWS::RDS::DBInstance

Non-compliant (StorageEncrypted for the AWS::RDS::DBInstance resource type is missing):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  RdsDbInstance:
    Type: AWS::RDS::DBInstance
    Properties:
      AllocatedStorage: 20
      DBInstanceClass: db.t3.micro
      DBName: testdbinstance
      Engine: MySQL
      MasterUserPassword: !Sub '{{resolve:secretsmanager:${RdsDbInstanceSecretsManagerSecret}::password}}'
      MasterUsername: !Sub '{{resolve:secretsmanager:${RdsDbInstanceSecretsManagerSecret}::username}}'
      PubliclyAccessible: false
  RdsDbInstanceSecretsManagerSecret:
    Type: AWS::SecretsManager::Secret
    Properties:
      GenerateSecretString:
        ExcludeCharacters: '"@/'
        GenerateStringKey: password
        PasswordLength: 30
        SecretStringTemplate: '{"username": "admin"}'
  RdsDbInstanceSecretsManagerSecretAttachment:
    Type: AWS::SecretsManager::SecretTargetAttachment
    Properties:
      SecretId: !Ref 'RdsDbInstanceSecretsManagerSecret'
      TargetId: !Ref 'RdsDbInstance'
      TargetType: AWS::RDS::DBInstance

Compliant (StorageEncrypted for the AWS::RDS::DBInstance resource type is set to true):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  RdsDbInstance:
    Type: AWS::RDS::DBInstance
    Properties:
      AllocatedStorage: 20
      DBInstanceClass: db.t3.micro
      DBName: testdbinstance
      Engine: MySQL
      MasterUserPassword: !Sub '{{resolve:secretsmanager:${RdsDbInstanceSecretsManagerSecret}::password}}'
      MasterUsername: !Sub '{{resolve:secretsmanager:${RdsDbInstanceSecretsManagerSecret}::username}}'
      PubliclyAccessible: false
      StorageEncrypted: true
  RdsDbInstanceSecretsManagerSecret:
    Type: AWS::SecretsManager::Secret
    Properties:
      GenerateSecretString:
        ExcludeCharacters: '"@/'
        GenerateStringKey: password
        PasswordLength: 30
        SecretStringTemplate: '{"username": "admin"}'
  RdsDbInstanceSecretsManagerSecretAttachment:
    Type: AWS::SecretsManager::SecretTargetAttachment
    Properties:
      SecretId: !Ref 'RdsDbInstanceSecretsManagerSecret'
      TargetId: !Ref 'RdsDbInstance'
      TargetType: AWS::RDS::DBInstance

AWS::RDS::GlobalCluster

Non-compliant (StorageEncrypted for the AWS::RDS::GlobalCluster resource type is missing):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  RdsGlobalCluster:
    Type: AWS::RDS::GlobalCluster
    Properties:
      Engine: aurora

Compliant (StorageEncrypted for the AWS::RDS::GlobalCluster resource type is set to true):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  RdsGlobalCluster:
    Type: AWS::RDS::GlobalCluster
    Properties:
      Engine: aurora
      StorageEncrypted: true

AWS::Redshift::Cluster

Non-compliant (Encrypted for the AWS::Redshift::Cluster resource type is missing):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  RedshiftCluster:
    Type: AWS::Redshift::Cluster
    Properties:
      ClusterType: single-node
      DBName: testdb
      MasterUserPassword: !Sub '{{resolve:secretsmanager:${RedshiftClusterSecretsManagerSecret}::password}}'
      MasterUsername: !Sub '{{resolve:secretsmanager:${RedshiftClusterSecretsManagerSecret}::username}}'
      NodeType: dc2.large
      PubliclyAccessible: false
  RedshiftClusterSecretsManagerSecret:
    Type: AWS::SecretsManager::Secret
    Properties:
      GenerateSecretString:
        ExcludeCharacters: '"''@/\'
        GenerateStringKey: password
        PasswordLength: 64
        SecretStringTemplate: '{"username": "admin"}'
  RedshiftClusterSecretsManagerSecretAttachment:
    Type: AWS::SecretsManager::SecretTargetAttachment
    Properties:
      SecretId: !Ref 'RedshiftClusterSecretsManagerSecret'
      TargetId: !Ref 'RedshiftCluster'
      TargetType: AWS::Redshift::Cluster

Compliant (Encrypted for the AWS::Redshift::Cluster resource type is set to true):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  RedshiftCluster:
    Type: AWS::Redshift::Cluster
    Properties:
      ClusterType: single-node
      DBName: testdb
      Encrypted: true
      MasterUserPassword: !Sub '{{resolve:secretsmanager:${RedshiftClusterSecretsManagerSecret}::password}}'
      MasterUsername: !Sub '{{resolve:secretsmanager:${RedshiftClusterSecretsManagerSecret}::username}}'
      NodeType: dc2.large
      PubliclyAccessible: false
  RedshiftClusterSecretsManagerSecret:
    Type: AWS::SecretsManager::Secret
    Properties:
      GenerateSecretString:
        ExcludeCharacters: '"''@/\'
        GenerateStringKey: password
        PasswordLength: 64
        SecretStringTemplate: '{"username": "admin"}'
  RedshiftClusterSecretsManagerSecretAttachment:
    Type: AWS::SecretsManager::SecretTargetAttachment
    Properties:
      SecretId: !Ref 'RedshiftClusterSecretsManagerSecret'
      TargetId: !Ref 'RedshiftCluster'
      TargetType: AWS::Redshift::Cluster

AWS::S3::Bucket

Non-compliant (ServerSideEncryptionConfiguration properties are missing):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  S3Bucket:
    Type: AWS::S3::Bucket

Compliant (ServerSideEncryptionConfiguration properties are are present, and are set up to use KMS encryption):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  S3Bucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketEncryption:
        ServerSideEncryptionConfiguration:
          - ServerSideEncryptionByDefault:
              SSEAlgorithm: aws:kms

AWS::SNS::Topic

Non-compliant (KmsMasterKeyId is missing):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  SnsTopic:
    Type: AWS::SNS::Topic

Compliant (KmsMasterKeyId is present):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  SnsTopic:
    Type: AWS::SNS::Topic
    Properties:
      KmsMasterKeyId: alias/aws/sns

AWS::SQS::Queue

Non-compliant (KmsMasterKeyId is missing):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  SqsQueue:
    Type: AWS::SQS::Queue
    Properties:
      SqsManagedSseEnabled: false

Compliant (KmsMasterKeyId is present):

AWSTemplateFormatVersion: "2010-09-09"
Description: Example AWS CloudFormation template.
Resources:
  SqsQueue:
    Type: AWS::SQS::Queue
    Properties:
      KmsMasterKeyId: alias/aws/sqs
      SqsManagedSseEnabled: false

Tests

Unit tests

To run unit tests, and verify code coverage, use the following command:

mvn clean verify

Contract tests

Contract tests help you validate hooks you develop work as expected, and must pass before you publish a hook you write, should you elect to publish your hook as a public extension. Your hook does not have to pass contract tests for being registered as a private extension, but it is highly recommended you implement contract test inputs and strive to pass them anyway.

For more information, see Testing registered hooks.

To run contract tests, start with setting up a retry configuration in your ~/.aws/config global AWS configuration file, should it be needed. For more information, see AWS CLI retries. Assuming you use a default profile, add this content to your file:

[default]
retry_mode = standard
max_attempts = 15

Next, open a new terminal window, and run:

sam local start-lambda

For more information, see Testing resource types locally using AWS SAM.

Open a another terminal window, and create a ~/.cfn-cli/ directory in your home directory:

mkdir ~/.cfn-cli/

Next, set up the configuration file for this hook, by copying the existing type_config.json file you created in the usage section above into a new ~/.cfn-cli/typeConfiguration.json file

cp type_config.json ~/.cfn-cli/typeConfiguration.json

Next, build this hook, and run contract tests:

cfn generate && mvn clean verify && cfn test -v --enforce-timeout 90

Hook development

For more information on developing CloudFormation Hooks, see Developing hooks.

To extend this hook with additional resource types whose KMS-related, user-specified configuration settings you want to validate (recommendations shown below to follow the alphabetical order, where indicated, as well as other style notes, are meant to help with code maintenance):

  • add the resource type name (e.g., AWS::SQS::Queue) to the awscommunity-kms-encryptionsettings.json schema, for both the preCreate and preUpdate handlers:
    • add the resource by following the alphabetical order;
    • if you plan to make API calls from the hook to the relevant AWS service, add the needed IAM permissions in permissions for the handlers as well, by following the alphabetical order;
  • if you plan to make API calls from the hook to the relevant AWS service: update the pom.xml file, and add the dependency for the relevant AWS service in the <dependencies> section (such as, the dependency for ec2 that is already in the POM file). Follow the alphabetical order of the <artifactId> values to add the dependency;
  • run cfn generate to generate the hook input model, so to include the schema changes above;
  • update the supported resource types in this hook section on this file accordingly;
  • if you plan to add hook configuration options:
    • update the usage and configuration options sections on this file accordingly, and follow the alphabetical order for entries in configuration options;
    • do the same for the type_config.json file, that you can find at the root level of the project;
  • update the contents of the templates called integ-succeed.yml and integ-fail.yml in the test directory, by adding the new resource: follow the alphabetical order of the relevant resource type: assign the logical ID of the resource a name that includes the second and the third segment of the resource type name, without the :: delimiters and in pascal case (e.g., S3Bucket for AWS::S3::Bucket). Resources described in these templates are expected to be created either successfully or not, respectively: reflect these intents in both templates;
  • update the example templates section on this file accordingly:
    • follow the alphabetical order of the relevant resource type;
    • add both use cases for both Non-compliant and Compliant cases, and add a brief description on why resources will be found to be Non-compliant or Compliant;
  • add the class where you will implement the support for the resource type:
    • as needed, create a new directory in main/java/com/awscommunity/kms/encryptionsettings/services, and add the relevant package-info.java file to it: see the package-info.java file for an existing service directory on this hook, and set the content for the new file accordingly;
    • add the new class file to the designated directory: mimic the name convention and method sorting that other relevant class files in other directories are using;
    • make sure the class implements the AwsKmsIntegratedService interface;
    • add the implementation of the class;
    • if needed, consider adding helper methods such as the existing ones in the classes inside the helpers package, and service-specific helpers in classes inside packages like ebs, ec2, rds;
  • wire up the class to the factory in the AwsKmsIntegratedServiceFactoryImpl class, by following the alphabetical order;
  • implement unit tests:
    • create a test model in the Mocks class for the resource type to cover: follow the existing methods whose names end in MockTargetModel;
    • consume the test model in unit tests you'll implement in the PreCreatePreUpdateHookHandlerCommonTests class;
    • add unit tests by following the alphabetical order of the relevant resource type;
    • wire up unit tests:
      • add the wire-up methods to both the PreCreateHookHandlerTest and PreUpdateHookHandlerTest classes;
      • when you add the wire-up methods, follow the alphabetical order of the relevant resource type;
  • run mvn clean verify to verify unit test coverage for this hook is met;
  • update contract tests inputs in the inputs directory: follow the alphabetical order of the relevant resource type;
  • make sure all contract tests pass;
  • submit the hook to the private registry in your account and for a given region, and test the changes.

Notes

The RPDK will automatically generate the correct hook input model from the schema whenever the project is built via Maven. You can also do this manually with the following command: cfn generate.

Please don't modify files under target/generated-sources/rpdk, as they will be automatically overwritten.

The code uses Lombok, and you may have to install IDE integrations to enable auto-complete for Lombok-annotated classes.