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AWS API Gateway MTLS authentication – with SmallStep & Pulumi




Introduction

In the course of the 2022 Christmas holidays, I acquired (re-)launched to Smallstep and imagine me it’s a very promising tech in PKI area, It eases an excellent variety of advanced issues that happen in case you have been self managing the PKI all by your self from scratch.

This weblog publish’s essential focus goes to be about – Securing the APIs deployed on AWS API gateway utilizing MTLS.

The second focus is on how we will leverage Smallstep for the PKI half.

Third most essential half being the infra provisioning utilizing Pulumi




Conditions

  • fundamental information of mtls & PKI.
  • above common information of AWS.
  • should personal a website. purchase it from AWS route 53, or purchase it from some place else and configure in AWS route 53 utilizing NS entries.
  • AWS CLI put in.
  • configure AWS credentials on native, profile based mostly.
  • some information of Pulumi IAC.
  • Pulumi CLI on native machine.
  • account at Pulumi
  • account at Smallstep
  • step CLI on the developer machine. (OPTIONAL)



Stack Diagram & Particulars

The stack diagram

The next are the essential stacks that are a part of this POC:-

  1. infra stack (REQUIRED)

    • manages the Certificates required for the API gateway customized domains, utilizing the AWS certificates Supervisor.
    • holds the s3 bucket that’s required for the belief retailer certificates chain.
  2. features stack (REQUIRED)

    • manages the lambda operate(s), presently a really fundamental single lambda operate, and associated permissions, and so forth.
  3. mtls-apis stack (REQUIRED)

    • manages the API gateway associated configuration, routes, integration, and so forth.
    • it refers the infra stack to drag certificates ARNs and so forth.
    • it refers the infra stack to drag s3 bucket & the ca.pem reference for the API gateway.
    • it refers the features stack to drag lambda operate ARNs and so forth.
  4. non-mtls-apis stack (OPTIONAL)

    • manages the API gateway associated configuration, routes, integration, and so forth.
    • it refers the infra stack to drag certificates ARNs and so forth.
    • it refers the features stack to drag lambda operate ARNs and so forth.



Code particulars

The code repository for the profitable POC is here

The folder construction is identical as per the above stack diagram.

Essential factors:-

  1. The Public DNS zone in AWS route 53 was created manually. That’s not a part of the stack provisioning.
  2. The order of executing the stack is infra, functions & then mtls-apis
  3. Change the config within the pulumi yaml information in respective folders of all stack, for AWS credentials, area, and DNS area associated modifications
  4. The ca.pem within the infra stack must be changed based mostly on the personal set of smallstep account. It’s at present associated to my very own smallstep account.



create the ca belief retailer file.

  1. Be sure to have a SmallStep Account & you might be logged in to identical.
  2. By default intermediate and root are created to your account. Click on on view particulars by clicking three dots towards the entries of root and intermediate certificates and duplicate each of certificates right into a single file.
    List of certificates

  3. Place the ca.pem within the infra stack’s folder.




create consumer certificates

  1. Within the smallstep dashboard goto -> Authorities -> Click on on the authority -> create certificates utilizing UI, fill topic & expiration, as proven beneath:-
    Create Certificate
  2. Authorize.
    Authorize
  3. Obtain key and certificates, secret is solely downloadable presently, in a while it won’t be out there, hold it secure, in any other case the MTLS protected API endpoint is perhaps compromised
    Download key and certificate



Testing the API endpoint utilizing POSTMAN

  1. Configure the consumer cert and key within the certificates part within the settings of POSTMAN

  2. If consumer cert not supplied, the we’ll get -** Error: learn ECONNRESET**

  3. If the consumer cert and key combo just isn’t right we’ll get 403

  4. If all profitable, the API will response again as beneath:-

the trail goes to be https://domain.com/v1/ping

{
    "ping": "pong",
    "success": true,
    "timestamp": 1676617772241
}
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Please be happy to succeed in out to me over Linkedin here for additional questions, doubts or options.

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