API Security Patterns

APIs are often the weakest link in security. This guide covers patterns to protect your endpoints.

Threat Modeling

Understanding potential attacks:

• Injection attacks through API parameters
• Broken access control exposing data
• Rate limiting bypass for DoS attacks

Security Layers

Defense Strategy

1. Authentication - verify identity
2. Authorization - check permissions
3. Input validation
   • Schema validation
   • Type checking
4. Rate limiting

Copy
1# Example: API rate limiting with Flask
2from flask_limiter import Limiter
3
4limiter = Limiter(app, key_func=get_remote_address)
5
6@app.route("/api/data")
7@limiter.limit("100/hour")
8def get_data():
9    return jsonify(data)

API Security Checklist

"Never trust the client. Always validate on the server."

• Security Principle

Monitoring & Logging

Essential for security:

• Log all authentication attempts
• Monitor for anomalies in traffic patterns
• Expose stack traces Return generic error messages

Check out OWASP API Security for more!