What is API Gateway Security?

API gateway security encompasses the controls and practices for protecting APIs at the gateway layer, including authentication, rate limiting, input validation, and threat detection.

What is API gateway security?

API gateway security implements protective controls at the API gateway layer, the central entry point for all API traffic. It enforces authentication and authorization, rate limiting, input validation, payload inspection, TLS termination, and threat detection to protect backend services from API-specific attacks and abuse.

What security features should an API gateway provide?

Essential features include OAuth 2.0 and JWT token validation, API key management, rate limiting and throttling per client, request payload validation against schemas, IP allowlisting and blocklisting, mutual TLS for service-to-service communication, request and response transformation, and integration with WAF and DDoS protection.

How does an API gateway enforce authentication?

API gateways validate authentication tokens (JWT, OAuth 2.0 access tokens, API keys) before routing requests to backend services. They verify token signatures, check expiration and scopes, validate claims against authorization policies, and reject unauthenticated requests at the edge before they reach application logic.

What is rate limiting in API gateway security?

Rate limiting controls API request volume per client, IP address, or API key to prevent abuse, brute force attacks, and denial of service. Gateways implement sliding window or token bucket algorithms with configurable thresholds. Adaptive rate limiting can dynamically adjust limits based on detected abuse patterns.

How do API gateways protect against OWASP API Top 10?

API gateways mitigate several OWASP API Top 10 risks including Broken Object Level Authorization through policy enforcement, Unrestricted Resource Consumption through rate limiting, and Unrestricted Access to Sensitive Business Flows through request validation. They complement application-level controls but cannot address all API security risks alone.

What is the role of schema validation in API security?

Schema validation at the gateway enforces that API request bodies conform to expected OpenAPI/Swagger specifications, rejecting malformed or oversized payloads before they reach backend services. This prevents injection attacks, parameter tampering, and mass assignment vulnerabilities by enforcing strict input contracts.

How should API gateways handle sensitive data?

API gateways should enforce TLS for all connections, mask or redact sensitive data in access logs, implement response filtering to prevent excessive data exposure, validate response payloads against schemas, and integrate with data loss prevention tools to detect sensitive data leakage through API responses.

How do you test API gateway security?

Testing includes attempting authentication bypass, testing rate limit enforcement, sending malformed payloads to test schema validation, evaluating authorization policy enforcement, testing TLS configuration, attempting parameter injection, verifying logging completeness, and conducting load testing to evaluate resilience under attack conditions.