✨ Threat Model

Author: pboling

.idea/copilotDiffState.xml

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+# Threat Model Outline for oauth2 Ruby Gem
+
+## 1. Overview
+This document outlines the threat model for the `oauth2` Ruby gem, which implements OAuth 2.0, 2.1, and OIDC Core protocols. The gem is used to facilitate secure authorization and authentication in Ruby applications.
+
+## 2. Assets to Protect
+- OAuth access tokens, refresh tokens, and ID tokens
+- User credentials (if handled)
+- Client secrets and application credentials
+- Sensitive user data accessed via OAuth
+- Private keys and certificates (for signing/verifying tokens)
+
+## 3. Potential Threat Actors
+- External attackers (internet-based)
+- Malicious OAuth clients or resource servers
+- Insiders (developers, maintainers)
+- Compromised dependencies
+
+## 4. Attack Surfaces
+- OAuth endpoints (authorization, token, revocation, introspection)
+- HTTP request/response handling
+- Token storage and management
+- Configuration files and environment variables
+- Dependency supply chain
+
+## 5. Threats and Mitigations
+
+### 5.1 Token Leakage
+- **Threat:** Tokens exposed via logs, URLs, or insecure storage
+- **Mitigations:**
+  - Avoid logging sensitive tokens
+  - Use secure storage mechanisms
+  - Never expose tokens in URLs
+
+### 5.2 Token Replay and Forgery
+- **Threat:** Attackers reuse or forge tokens
+- **Mitigations:**
+  - Validate token signatures and claims
+  - Use short-lived tokens and refresh tokens
+  - Implement token revocation
+
+### 5.3 Insecure Communication
+- **Threat:** Data intercepted via MITM attacks
+- **Mitigations:**
+  - Enforce HTTPS for all communications
+  - Validate SSL/TLS certificates
+
+### 5.4 Client Secret Exposure
+- **Threat:** Client secrets leaked in code or version control
+- **Mitigations:**
+  - Store secrets in environment variables or secure vaults
+  - Never commit secrets to source control
+
+### 5.5 Dependency Vulnerabilities
+- **Threat:** Vulnerabilities in third-party libraries
+- **Mitigations:**
+  - Regularly update dependencies
+  - Use tools like `bundler-audit` for vulnerability scanning
+
+### 5.6 Improper Input Validation
+- **Threat:** Injection attacks via untrusted input
+- **Mitigations:**
+  - Validate and sanitize all inputs
+  - Use parameterized queries and safe APIs
+
+### 5.7 Insufficient Logging and Monitoring
+- **Threat:** Attacks go undetected
+- **Mitigations:**
+  - Log security-relevant events (without sensitive data)
+  - Monitor for suspicious activity
+
+## 6. Assumptions
+- The gem is used in a secure environment with up-to-date Ruby and dependencies
+- End-users are responsible for secure configuration and deployment
+
+## 7. Out of Scope
+- Security of external OAuth providers
+- Application-level business logic
+
+## 8. References
+- [OAuth 2.0 Threat Model and Security Considerations (RFC 6819)](https://tools.ietf.org/html/rfc6819)
+- [OWASP Top Ten](https://owasp.org/www-project-top-ten/)
+
+---
+This outline should be reviewed and updated regularly as the project evolves.
+