DollhouseMCP

# Remaining Security Work - July 12, 2025 ## Overview This document tracks the remaining security work after completing critical items (ReDoS protection and input length validation). ## Completed Security Features ✅ 1. **Content Sanitization** - Prompt injection protection 2. **Security Monitoring** - Comprehensive event logging 3. **Path Traversal Protection** - Path validation 4. **Command Injection Prevention** - Command validator 5. **YAML Injection Protection** - SecureYamlParser 6. **ReDoS Protection** - Pattern complexity analysis (PR #242) 7. **Input Length Validation** - Size limits before processing (PR #243) ## Remaining High Priority Security Issues ### 1. Rate Limiting for Token Validation (Issue #174) **Estimated Time**: 2-3 hours **Difficulty**: Easy **Current State**: - `RateLimiter.ts` already implements token bucket algorithm - `tokenManager.ts` exists but doesn't use rate limiting **Implementation**: ```typescript // In tokenManager.ts private rateLimiter = RateLimiter.createForTokenValidation(); async validateToken(token: string): Promise<boolean> { if (!this.rateLimiter.tryConsume()) { throw new SecurityError('Rate limit exceeded for token validation'); } // ... existing validation } ``` ### 2. Expand YAML Security Patterns (Issue #164) **Estimated Time**: 2-3 hours **Difficulty**: Medium **Current Patterns**: - Python/JS code execution - Command injection - YAML bombs **Patterns to Add**: - Advanced code execution variants - Protocol handlers (file://, data://) - Unicode bypass attempts - Nested tag combinations **Files to Update**: - `src/security/yamlValidator.ts` - `src/security/contentValidator.ts` (MALICIOUS_YAML_PATTERNS) ### 3. Unicode Normalization (Issue #162) **Estimated Time**: 3-4 hours **Difficulty**: Medium-High **Requirements**: - Normalize Unicode before validation - Prevent homograph attacks - Handle direction override characters **Implementation Areas**: - `InputValidator.ts` - Add normalization function - All validators - Call normalization before checks - Tests for various Unicode tricks ### 4. Security Audit Automation (Issue #53) **Estimated Time**: 4-6 hours **Difficulty**: High **Components**: - GitHub Action for security scanning - Integrate existing tools (CodeQL, npm audit) - Add specialized tools (Snyk, OWASP) - Regular dependency updates ## Medium Priority Improvements ### From PR Reviews: 1. **Pattern Analysis Caching** - Cache regex complexity analysis 2. **Improved Overlap Detection** - Better alternation analysis 3. **Standardized Error Messages** (Issue #244) 4. **Security Event Monitoring** (Issue #245) ### Additional Considerations: 1. **Configuration System** - Make limits configurable 2. **Performance Benchmarks** - Track validation performance 3. **Security Documentation** - Comprehensive security guide ## Quick Implementation Guide ### Next Session Priority Order: 1. **Rate Limiting** (Issue #174) - Quickest win with existing infrastructure 2. **YAML Patterns** (Issue #164) - Important for marketplace security 3. **Unicode Normalization** (Issue #162) - Prevents bypass attacks 4. **Security Automation** (Issue #53) - Long-term maintenance ### Key Files for Reference: - Security validators: `src/security/` - Test files: `__tests__/security/` - Constants: `src/security/constants.ts` - Error types: `src/security/errors.ts` ## Security Posture Summary ### Strong Points: - Multiple layers of defense - Comprehensive input validation - Pattern-based threat detection - Performance-conscious implementation - Excellent test coverage ### Areas for Enhancement: - Rate limiting on all endpoints - More sophisticated pattern detection - Unicode handling - Automated security scanning ## Notes for Next Session 1. All critical security issues are resolved 2. Focus on high-value quick wins 3. Consider creating a security roadmap issue 4. Document security architecture