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Example cloudformation hook for ECR resources

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Stelligent::ECRExample::Hook

This is an example CloudFormation Hook that checks compliance against AWS::ECR::Repository resources.

What does it enforce?

  1. Repo Encryption is using KMS
  2. Images are scanned on push
  3. Image tags are immutable

When does it run?

This hook will run against all AWS::ECR::Repository resources at create or update.

Publishing and testing the hook

To package and publish the hook into your account run cfn submit --set-default.

Note the ARN of the generated hook, or gather it using aws cloudformation list-types

Finally, enable the hook to execute against stacks in the account by pushing up a type configuration. In this example, the hook executes against ALL stacks, but on errors will WARN. Set your hook ARN as appropriate.

export HOOK_TYPE_ARN=<your arn>
export HOOK_CONFIG=$(cat test/hook_configuration.json)
aws cloudformation set-type-configuration --configuration $HOOK_CONFIG --type-arn $HOOK_TYPE_ARN

# Execute a test with the example cfn template
aws cloudformation deploy --template-file test/ecr_test.yml --stack-name ecr-hook-test
# Review the stack events to see hook results
aws cloudformation describe-stack-events --stack-name ecr-hook-test
# Cleanup the test stack
aws cloudformation delete-stack --stack-name ecr-hook-test

Implementation

The hook schema is defined in stelligent-ecrexample-hook.json.

The hook implementation is contained in src/stelligent_ecrexample_hook/handlers.py

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Example cloudformation hook for ECR resources

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