Network Security for Serverless on AWS

2.1 Serverless Architecture

Serverless architecture allows developers to build and run applications without managing servers. AWS Lambda is a prime example, where you can execute code in response to triggers.

2.2 Security Challenges

• Data Exposure: Sensitive data can be exposed through misconfigurations.
• Identity and Access Management: Proper IAM policies are crucial.
• API Security: Protecting APIs from unauthorized access is vital.

3.1 IAM Policies

Always implement the principle of least privilege when creating IAM roles for serverless functions.

3.2 Use VPC Endpoints

Utilize VPC endpoints to secure communications between your AWS services.

3.3 Monitor and Log

Enable AWS CloudTrail and AWS Config to monitor and log API calls and resource configurations.

3.4 API Gateway Security

• Use API keys and Lambda authorizers for authentication.
• Implement rate limiting to mitigate DDoS attacks.

4.1 Example IAM Policy

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "lambda:InvokeFunction",
            "Resource": "arn:aws:lambda:us-east-1:123456789012:function:MyFunction"
        }
    ]
}

4.2 API Gateway Setup

const AWS = require('aws-sdk');
const apigateway = new AWS.APIGateway();

const params = {
    restApiId: 'your-api-id',
    body: {
        // API configuration
    }
};

apigateway.createRestApi(params, function(err, data) {
    if (err) console.log(err, err.stack); // an error occurred
    else     console.log(data);           // successful response
});