WebSocket API Gateway Permission and Access Control Solutions

To ensure secure WebSocket API Gateway permission and access control, organizations need to implement robust solutions. These solutions should be able to handle complex scenarios.

A WebSocket API Gateway can be configured to use OAuth 2.0 for authentication and authorization. This allows for secure access to protected resources.

For example, a company can use a WebSocket API Gateway to restrict access to sensitive data based on user roles. This can be achieved through the use of JSON Web Tokens (JWT).

Implementing WebSocket API Gateway permission and access control requires careful planning and execution to avoid security vulnerabilities.

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The WebSocket API is public and hasn't implemented any authorization mechanisms, making it vulnerable to unauthorized access.

Implementing authorization logic directly in the WS Connect Function is a straightforward approach, but it sacrifices several quality attributes that are important in the target architecture.

Here are some of the quality attributes that are affected by this approach:

The WebSocket API's lack of authorization mechanisms and the limitations of implementing authorization logic in the WS Connect Function create a challenge that needs to be addressed.

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Decoupling authorization logic from the WebSocket API back-end implementation is a key principle in designing a scalable and secure WebSocket API Gateway. This approach allows for a more modular and maintainable system, as mentioned in the article.

One possible solution is to use Identity and Access Management (IAM) authorization, which can be easily integrated with WebSocket API Gateways. This approach offloads the authorization logic to IAM, freeing up the WS Connect Function to focus on processing WebSocket connections.

Using IAM authorization provides several benefits, including improved performance, scalability, flexibility, security, maintainability, reusability, and testability. Here are some specific advantages of this approach:

The WebSocket API Gateway is a powerful tool for handling real-time communication between clients and servers. It's a stateful connection, meaning we can configure authorization on the $connect route only, which is executed while the connection is being established.

To support most third-party applications, we'll use the Lambda JWT Authorizer, which integrates with any JWT token provider and verifies user's JWT token integrity using provider's public keys.

For another approach, see: Azure Api Connection

The authorizer can also verify token expiration, check that the token is issued for an audience in the allowed audiences list, bind the JWT's sub user attribute to the API Gateway authorization policy, and return a deny or allow authorization policy to API Gateway.

To set up the API Gateway, we need to create an IAM Role for it to assume and attach an IAM Policy to it, allowing it to integrate with the Lambda JWT Authorizer and DynamoDB.

Here are the key components we need to set up:

By using these components together, we can securely and efficiently manage WebSocket connections and authorize users before establishing a connection.

The maximum connection duration for WebSocket APIs is 2 hours, so we need to make sure stale connections are deleted from DynamoDB. We can do this by setting the connection TTL attribute delete_at to now+2H.

Here's a summary of the key steps to set up the WebSocket API Gateway:

By following these steps, we can create a secure and scalable WebSocket API Gateway that meets our needs.

Security and Permissions are crucial aspects of setting up a WebSocket API Gateway. To ensure secure connections, you need to sign the wss URL, which can be achieved using the Signer.signUrl method from @aws-amplify/core library.

The signed wss URL includes parameters such as X-Amz-Algorithm, X-Amz-Credential, X-Amz-Date, X-Amz-Security-Token, X-Amz-SignedHeaders, and X-Amz-Signature. These parameters are essential for authenticating the user and authorizing access to the WebSocket API.

To verify the token, you can use the jsonwebtoken library, which requires the public key in PEM format. This can be obtained from the Cognito endpoint in the following format: https://cognito-idp.us-east-1.amazonaws.com/us-east-1_abc123/.well-known/jwks.json.

The Authorizer Function generates a policy allowing or denying clients' access to the WebSocket API Gateway, passing the token payload together with any parameters needed through the context. This ensures that the context data is not tampered with by clients and is available in every other WebSocket API back-end call.

Here are the key permissions required for setting up a WebSocket API Gateway:

These permissions enable the integration of the WebSocket API with various components, including the connections store and request authorizer. By setting up the correct IAM Role and attaching the necessary IAM Policy, you can ensure secure and authorized access to your WebSocket API Gateway.

The benefits of a WebSocket API gateway permission system are numerous.

This approach enhances interoperability by allowing front-end integration to utilize the same access token as it already does with Cognito, eliminating the need to deviate from existing authorization patterns.

One of the key benefits is the ability to extend the logic in the Authorizer Function or Sign Function to determine parameters of the request to the WebSocket API, keeping separation of concerns.

Examples of such parameters controlled by the authorization logic include user preferences, geographical filters, type of data, time intervals to receive data through WebSockets, and any other custom metadata relevant to your use case.

The Authorizer Function can also drop connections without the header passed to avoid unnecessary calls to the Authorizer Function when configuring Identity Source at the WebSocket API Gateway level.

This solution provides additional benefits, such as the ability to add query attributes to the URL or headers to the request that will be available in the context of WS Connect Function, making the URL immutable.

The Sign Function can be extended to add these parameters, which can be used to determine the type of connection needed upfront, keeping business logic separate from the WebSocket API back-end.

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Connecting users to your WebSocket API is a straightforward process, and you can do it using the native Websocket component or a helper package like Sockette.

To establish a connection, you'll need to include the authorization query string in your request. This will allow API Gateway to verify your identity and grant you access to the API.

API Gateway will respond with a pong frame immediately after receiving a ping frame from your client, helping to keep the connection active.

You can use a helper package like Sockette to simplify the connection process.

Here are the key points to keep in mind when connecting users to your WebSocket API: