Securing Azure Functions: Access Control, CORS, and Keys

Serverless applications offer incredible scalability, but without proper security, your endpoints remain vulnerable to unauthorized access and malicious exploits. This written guide walks you through the essential steps to secure your serverless APIs and backend services. You will transition from deploying open, public functions to implementing a robust, defense-in-depth security posture. Through clear explanations and step-by-step text configurations, you will gain the confidence to lock down your endpoints using industry-standard protocols. What you'll learn: - Understand foundational serverless security concepts and the shared responsibility model in cloud environments. - Configure function, host, and master keys to restrict unauthorized API access. - Implement appropriate authorization levels for your HTTP triggers. - Set up Cross-Origin Resource Sharing (CORS) policies to prevent unauthorized domain requests. - Apply modern security practices including managed identities and zero-trust principles to avoid hardcoded secrets. - Practice verifying your security configurations through structured, written scenarios and testing exercises. The course begins with essential terminology and foundational security concepts before moving into practical configurations for access keys, CORS, and authorization levels. It concludes with modern best practices for identity management and secure secret storage. This course is designed for beginner cloud developers and security enthusiasts, with no prior Azure security experience required. Start reading today to build safer, more resilient serverless applications.