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cfn-kms-provider

A CloudFormation custom resource provider for creating KMS grants.

Read about the usefulness of this provider on how to start auto scaling group instances using a cross account encrypted AMI.

How do I create a KMS grant?

It is quite easy: you specify a CloudFormation resource of the Custom::KMSGrant, as follows:

KMSGrant:
  Type: Custom::KMSGrant
  Properties:
    KeyId: !GetAtt EncryptionKey.Arn
    GranteePrincipal: !Sub 'arn:aws:iam::${AWS::AccountId}:role/aws-service-role/autoscaling.amazonaws.com/AWSServiceRoleForAutoScaling'
    Operations:
      - 'Encrypt'
      - 'Decrypt'
      - 'ReEncryptFrom'
      - 'ReEncryptTo'
      - 'GenerateDataKey'
      - 'GenerateDataKeyWithoutPlaintext'
      - 'DescribeKey'
      - 'CreateGrant'
    ServiceToken: !Sub 'arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:binxio-cfn-kms-provider'

It will return the GrantId and the GrantToken as attribute. Referencing the resource will return the grant id.

Installation

To install this custom resource, type:

aws cloudformation deploy \
	--capabilities CAPABILITY_IAM \
	--stack-name cfn-kms-provider \
	--template-file ./cloudformation/cfn-kms-provider.yaml

This CloudFormation template will use our pre-packaged provider from s3://binxio-public-${AWS_REGION}/lambdas/cfn-kms-provider-0.1.4.zip.

Demo

To install the simple sample of the Custom Resource, type:

aws cloudformation deploy --stack-name cfn-kms-provider-demo \
	--template-file ./cloudformation/demo-stack.json