RDKlib

RDKlib is a Python library to enable you to run custom AWS Config Rules at scale. The library can be used to:

• Help you to focus only on the compliance logic, while the library does the heavy lifting
• Ease maintenance by moving the boilerplate code as a AWS Lambda Layer
• Ease deployment by using AWS Serverless Application Repository

RDKLib works in synergy with the AWS Config Rule Development Kit.

Getting Started

Install the library locally

pip install rdklib

Create a rule using the RDK

Note: you need to install the RDK first.

To use rdklib, specify a python3.x-lib runtime when you run rdk create (or don't specify any runtime; rdklib is now the default for rdk create). This will populate the rdklib runtime in the RDK parameters.json of your Rule template. Examples:

• For periodic trigger:

    rdk create YOUR_RULE_NAME --runtime python3.12-lib --maximum-frequency TwentyFour_Hours

• For configuration change trigger (for example S3 Bucket):

    rdk create YOUR_RULE_NAME --runtime python3.12-lib --resource-types AWS::S3::Bucket

After you've created your rule, update the .py file that was generated, adding your custom logic within the evaluate_change() method for change-triggered rules or the evaluate_periodic() method for periodic rules (you may need to uncomment evaluate_periodic(). If you need to create a boto3 client, use the client_factory helper (eg. instead of boto3.client("s3"), use client_factory.build_client("s3")). Examples of rdklib rules can be found here.

Deploy your rule with RDKlib layer

RDKlib is designed to work as a AWS Lambda Layer. It allows you to use the library without needing to include it in your deployment package.

1. Install RDKlib layer (with AWS CLI)

    aws serverlessrepo create-cloud-formation-change-set --application-id arn:aws:serverlessrepo:ap-southeast-1:711761543063:applications/rdklib --stack-name RDKlib-Layer

    # Copy/paste the full change-set ARN to customize the following command
    aws cloudformation execute-change-set --change-set-name NAME_OF_THE_CHANGE_SET

    aws cloudformation describe-stack-resources --stack-name serverlessrepo-RDKlib-Layer
    # Copy the ARN of the Lambda layer in the "PhysicalResourceId" key (i.e. arn:aws:lambda:YOUR_REGION:YOUR_ACCOUNT:layer:rdklib-layer:1).

Note: You can do the same step manually going to https://console.aws.amazon.com/lambda/home#/create/function?tab=serverlessApps and find "rdklib"

1. Deploy the rule

    rdk deploy YOUR_RULE_NAME --rdklib-layer-arn YOUR_RDKLIB_LAYER_ARN

FAQs

• Q. What is the client_factory that I see in my rdklib rules?
  • A. A client_factory is a class that allows for dynamic provisioning of a boto3 client. In an rdklib rule, you should treat client_factory as the way to create a boto3 client. So instead of calling client = boto3.client("s3"), you would call client = client_factory.build_client("s3").
    • Q. ...Why?
      • A. It's mainly there to allow for cross-account functionality so that your client evaluates the rule in the right account.

License

This project is licensed under the Apache-2.0 License.

Feedback / Questions

Feel free to email rdk-maintainers@amazon.com

Contacts

• Benjamin Morris - Maintainer, code, testing

Acknowledgements

• Mark Beacom - Maintainer, code, testing
• Michael Borchert - Design, code, testing, feedback
• Ricky Chau - Maintainer, code, testing
• Julio Delgado Jr. - Design, testing, feedback
• Chris Gutierrez - Design, feedback
• Joe Lee - Design, feedback
• Jonathan Rault - Maintainer, design, code, testing, feedback
• Carlo DePaolis - Maintainer, code, testing