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Secure Serverless REST API Using Auth0

A simple REST API that is protected by a custom AWS Lambda Authorizer. The Authorizer uses Auth0 to authorize requests.

This example is similar to Auth0's tutorial: Secure AWS API Gateway Endpoints Using Custom Authorizers, but uses Pulumi to create the Serverless app and Custom Authorizer.

Set Up Auth0

You can follow the steps below or alternatively you can follow Auth0's Part 1: Create an Auth0 API.

  1. Sign up for an Auth0 account or login if you already have one.

  2. Click on APIs in the left-hand menu.

  3. Click Create API.

    • Enter a name and Identifier for you New API.
    • Select RS256 as the Signing Algorithm.
    • Click Create.

  4. Under the Quick Start tab, the Node.js example will show you the values for jwksUri, audience and issuer you will need in the next section.

Deploying and Running the Program

  1. Create a new stack:

    pulumi stack init auth0-api-testing

  2. Set the AWS region:

    pulumi config set aws:region us-east-2

  3. Set up the Auth0 configuration values as secrets in Pulumi:

    Run the following commands after replacing <jwksUri>, <audience> and <issuer> with the appropriate values.

    pulumi config set --secret jwksUri <jwksUri>
pulumi config set --secret audience <audience>
pulumi config set --secret issuer <issuer>

  4. Restore NPM modules via npm install or yarn install.

  5. Run pulumi up to preview and deploy changes:

$ pulumi up
Previewing update (dev):

...

Updating (dev):

     Type                                Name                                         Status      Info
 +   pulumi:pulumi:Stack                 lambda-authorizer-dev                        created     1 message
 +   ├─ aws:apigateway:x:API             myapi                                        created
 +   │  ├─ aws:iam:Role                  myapi70a45a97                                created
 +   │  ├─ aws:iam:RolePolicyAttachment  myapi70a45a97-32be53a2                       created
 +   │  ├─ aws:lambda:Function           myapi70a45a97                                created
 +   │  ├─ aws:apigateway:RestApi        myapi                                        created
 +   │  ├─ aws:apigateway:Deployment     myapi                                        created
 +   │  ├─ aws:lambda:Permission         myapi-31a4e902                               created
 +   │  └─ aws:apigateway:Stage          myapi                                        created
 +   ├─ aws:iam:Role                     jwt-rsa-custom-authorizer                    created
 +   ├─ aws:iam:Role                     jwt-rsa-custom-authorizer-authorizer-role    created
 +   ├─ aws:iam:RolePolicyAttachment     jwt-rsa-custom-authorizer-32be53a2           created
 +   ├─ aws:lambda:Function              jwt-rsa-custom-authorizer                    created
 +   └─ aws:iam:RolePolicy               jwt-rsa-custom-authorizer-invocation-policy  created

Outputs:
    url: "https://***.execute-api.us-east-2.amazonaws.com/stage/"

Resources:
    + 14 created

Duration: 18s

Testing Our API

We can now use cURL to test out our new endpoint. If we cURL without a token, we should get a 401 Unauthorized response.

$ curl $(pulumi stack output url)hello
{"message":"Unauthorized"}

We can curl our endpoint with an invalid token and should once again get a 401 Unauthorized response.

$ curl $(pulumi stack output url)hello -H "Authorization: Bearer invalid"
{"message":"Unauthorized"}

Finally, we expect a 200 response when we obtain a token from Auth0 and use it to call our API. We can get a token by visiting the API Details page for our API and clicking the Test tab. Using the provided access token and the API a 200 response: Hello world!

$ curl $(pulumi stack output url)hello -H "Authorization: Bearer <VALID_TOKEN>"
<h1>Hello world!</h1>

Clean up

  1. Run pulumi destroy to tear down all resources.

  2. To delete the stack itself, run pulumi stack rm. Note that this command deletes all deployment history from the Pulumi Console.