I’m having trouble with my AWS API Gateway setup. When I set the authentication to NONE, everything works perfectly, but this makes my API public and anyone can call it with just the URL.
To secure my endpoint, I switched to AWS_IAM authentication and gave my user the AmazonAPIGatewayInvokeFullAccess policy. But now I keep getting this error:
{ message: "Missing Authentication Token" }
I’m not sure what step I’m missing to make the authenticated calls work properly. Any ideas what could be wrong?
sounds like ya missing aws creds setup. double-check your aws cli config or env vars - boto3 needs access keys to sign requests. also, make sure your endpoint url is right cuz wrong urls can trigger the same error.
The issue you’re encountering often arises from not signing your requests properly with the AWS Signature Version 4. Unlike public APIs, AWS_IAM authentication requires that all requests be authenticated. If you’re working in a JavaScript environment, I recommend using the AWS SDK to handle this for you. It simplifies the process significantly. Alternatively, if you’re using a server-side platform, consider tools like Postman that support AWS signature authentication. For a simpler security mechanism, API keys can be a viable alternative, as they provide basic security without the complexity of IAM authentication.
The “Missing Authentication Token” error occurs when your requests are not properly signed after switching to AWS_IAM authentication. Each request needs to be signed with AWS Signature Version 4, and having the right IAM policy alone won’t suffice.
If you are utilizing the AWS SDK, ensure you are making calls through it, as it manages the signing automatically. For direct HTTP requests, you will need to implement SigV4 signing or employ a library that facilitates this. Additionally, verify that your AWS credentials are correctly configured in your environment.