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CodeSignal

Preventing Refresh Token Abuse

via CodeSignal

Overview

Modern web applications frequently rely on refresh tokens to seamlessly re-authenticate users without forcing them to log in repeatedly. While convenient, mishandling refresh tokens can grant attackers near-permanent access.

Syllabus

  • Unit 1: Introduction to Refresh Tokens
    • Implementing the RefreshToken Model
    • Implement the CreateAuthTokens Helper Function
    • Implement Refresh Token Rotation
    • Add Comprehensive Error Handling to Token Refresh
  • Unit 2: Detecting Stolen Tokens
    • Implement the RefreshLog Model for Token Theft Detection
    • Implement Token Theft Detection in the Refresh Endpoint
    • Implementing Security Response for Token Theft Detection
    • Implement Security Analysis for Refresh Token Logs
  • Unit 3: Implementing Token Blacklisting
    • Implement Token Blacklist Model
    • Implement Token Revocation Service Method
    • Implement Token Blacklist Checking in Authentication Middleware
    • Implement Admin Token Revocation Endpoint
  • Unit 4: Context Aware Validation
    • Implement Role-Based Access Control Middleware
    • Implementing Token Blacklisting
    • Implement IP Address Validation for Tokens

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