token-security-review.mdโข3.03 kB
# Token Management Security Review
## Date: July 14, 2025
## Reviewer: Claude (with Mick)
## Summary
The TokenManager implementation in DollhouseMCP has been reviewed for security vulnerabilities. Overall, the implementation follows good security practices with proper validation, redaction, and rate limiting.
## Strengths โ
### 1. Token Format Validation
- Validates all GitHub token types (PAT, Installation, User Access, Refresh)
- Uses strict regex patterns: `/^ghp_[A-Za-z0-9_]{36,}$/`
- Rejects invalid formats before any processing
- Minimum length requirement prevents short/weak tokens
### 2. Token Redaction & Privacy
- `redactToken()` shows only `ghp_...7890` format
- `createSafeErrorMessage()` removes all token patterns from errors
- Consistent use of `getTokenPrefix()` for safe logging
- No full tokens appear in logs or error messages
### 3. Rate Limiting Protection
- Token validation rate-limited to 10 attempts per hour
- Prevents brute force attacks on token validation endpoint
- Uses token bucket algorithm with minimum 5-second delay
- Proper SecurityError with retry information
### 4. API Security
- Always uses `Bearer ${token}` authorization format
- Includes proper headers (User-Agent, Accept)
- Validates token scopes via GitHub API `/user` endpoint
- Handles API errors without exposing sensitive data
### 5. No Persistent Storage
- Tokens only read from `process.env.GITHUB_TOKEN`
- No caching or file storage of tokens
- No database storage of tokens
- Memory-only usage pattern
## Recommendations for Enhancement ๐ง
### 1. Token Wrapper Class (Medium Priority)
Consider implementing a `SecureToken` class that:
- Encrypts token in memory
- Provides controlled access methods
- Automatically clears on disposal
- Prevents accidental logging
### 2. Token Rotation Support (Low Priority)
Add support for:
- Token expiration handling
- Refresh token flow for OAuth tokens
- Automatic token renewal
- Expiration warnings
### 3. Enforce Scope Validation (Medium Priority)
- Make scope validation mandatory for all API calls
- Cache validated scopes for performance
- Alert on insufficient permissions before operations
### 4. Memory Protection (Low Priority)
- Consider using Node.js crypto for in-memory encryption
- Clear tokens from memory after use
- Use secure comparison for token validation
## Security Checklist โ
- [x] Tokens validated before use
- [x] Tokens redacted in logs
- [x] Rate limiting implemented
- [x] No hardcoded tokens
- [x] No token storage
- [x] Proper error handling
- [x] Secure API communication
- [x] Token type detection
- [x] Scope validation available
- [x] No tokens in error messages
## Conclusion
The current TokenManager implementation is **production-ready** from a security perspective. The suggested enhancements would provide defense-in-depth but are not critical for the current threat model.
No immediate action required. The implementation properly protects tokens from exposure and follows security best practices.
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