23.12. API Gateway Integration with AWS Lambda: Security and Access Control with API Gateway

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API Gateway is an incredible tool from AWS that allows developers to create, publish, maintain, monitor, and secure APIs at any scale. API Gateway's integration with AWS Lambda takes this functionality to a new level, allowing developers to create serverless REST and WebSocket APIs. However, security and access control are critical aspects of creating APIs and this is where API Gateway really shines.

API Gateway offers several layers of security that can be used to protect your APIs. First, API Gateway supports IAM authorizers, which allow you to use IAM policies to control who can call your APIs. This is useful for authorizing calls from API from other AWS services or IAM users. Additionally, API Gateway supports token authorizers, which allow you to use JWT tokens (JSON Web Tokens) to authorize API calls. This is useful for authorizing API calls from client applications.

In addition to authorizers, API Gateway also supports CORS (Cross-Origin Resource Sharing) policies, which allow you to control which domains can make calls to your APIs. This is useful for preventing CSRF (Cross-Site Request) attacks Forgery) and ensure that only trusted applications can make calls to your APIs.

Another layer of security that API Gateway offers is key-based access control. This allows you to create API keys and associate them with one or more usage plans. Each usage plan has a set of quotas and limits that you can configure to control how API keys can be used to make calls to your APIs. This is useful for limiting the use of your APIs and protecting against abuse.

API Gateway integration with AWS Lambda also allows you to use Lambda functions to implement custom authorization logic. For example, you can use a Lambda function to check whether a user has permission to call an API based on their role or user group. This is useful for implementing role-based authorization (RBAC) or attribute-based authorization (ABAC).

In addition to offering multiple layers of security, API Gateway also offers granular access control capabilities. For example, you can configure API Gateway to allow or deny API calls based on specific criteria such as HTTP method, API path, API header, API query parameter, API body, etc. . This is useful for implementing the principle of least privilege (PoLP) and ensuring that users and applications can only make API calls that are strictly necessary for their operations.

In short, API Gateway integration with AWS Lambda offers a robust and secure solution for developing serverless APIs. With API Gateway, you can protect your APIs with multiple layers of security and control access to your APIs with granularity. Additionally, with AWS Lambda, you can implement custom authorization logic and respond to API events in real time. So, if you're looking for a way to develop secure and scalable APIs, integrating API Gateway with AWS Lambda is an excellent choice.

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9923.13. API Gateway Integration with AWS Lambda: Optimization and Scaling with AWS Lambda