API Gateway without configured authorizer

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Metadata

Id: 0a96ce49-4163-4ee6-8169-eb3b0797d694

Cloud Provider: AWS

Platform: Terraform

Severity: Medium

Category: Access Control

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Description

This check ensures that all AWS API Gateway REST APIs have an associated API Gateway authorizer, which is responsible for validating incoming requests before granting access to backend resources. Without specifying an authorizer using the aws_api_gateway_authorizer resource and linking it to the rest_api_id attribute in your Terraform configuration, APIs may be left unprotected, allowing unauthenticated and potentially malicious users to access sensitive endpoints. Failure to enforce proper authorization can result in unauthorized access, data exposure, or abuse of backend services.

Compliant Code Examples

resource "aws_api_gateway_authorizer" "demo" {
  name                   = "demo"
  rest_api_id            = aws_api_gateway_rest_api.demo.id
  authorizer_uri         = aws_lambda_function.authorizer.invoke_arn
  authorizer_credentials = aws_iam_role.invocation_role.arn
}

resource "aws_api_gateway_rest_api" "demo" {
  name = "auth-demo"
}

Non-Compliant Code Examples

resource "aws_api_gateway_authorizer" "demo" {
  name                   = "demo"
  rest_api_id            = aws_api_gateway_rest_api.demo.id
  authorizer_uri         = aws_lambda_function.authorizer.invoke_arn
  authorizer_credentials = aws_iam_role.invocation_role.arn
}

resource "aws_api_gateway_rest_api" "demo2" {
  name = "auth-demo"
}