MCP Chat Support System

# 🔍 RAG Pipeline Security & Quality Audit Report **Date:** 2024 **Reviewer:** Senior AI Engineer **System:** ClientSphere RAG Backend --- ## 1) ✅ RAG Status Summary **Overall Status:** ⚠️ **NEEDS FIXES** - Core functionality is solid, but critical multi-tenant security issues must be addressed before production. ### ✅ What's Working: - Document ingestion pipeline (PDF/DOCX/TXT/MD parsing) - Token-aware chunking with overlap - Embedding generation (Sentence Transformers) - Vector store operations (ChromaDB) - Retrieval with similarity scoring - Anti-hallucination prompts - Citation extraction ### 🔴 Critical Issues Found: 1. **Multi-tenant isolation vulnerability** - Missing tenant_id/client_id 2. **Shared collection risk** - All tenants in same ChromaDB collection 3. **No authentication/authorization** - API endpoints unprotected 4. **CORS too permissive** - Allows all origins 5. **Missing input validation** - File size/type not properly validated --- ## 2) 🔴 Critical Issues (MUST FIX) ### Issue #1: Multi-Tenant Data Isolation Vulnerability **Severity:** CRITICAL **Risk:** Tenant A can access Tenant B's data if they guess kb_id **Problem:** - Current filtering uses only `user_id` + `kb_id` - No `tenant_id` or `client_id` field in metadata - If two users from different tenants share a kb_id, data could leak - Collection is shared across all tenants **Fix Required:** - Add `tenant_id` to all metadata - Enforce tenant_id filtering in ALL queries - Consider per-tenant collections for stronger isolation ### Issue #2: No Authentication/Authorization **Severity:** CRITICAL **Risk:** Anyone can access any user's data by guessing user_id/kb_id **Problem:** - Endpoints accept user_id/kb_id directly from request - No verification that requester owns these IDs - No JWT/auth token validation **Fix Required:** - Add authentication middleware - Verify user_id matches authenticated user - Add tenant_id from auth token - Implement RBAC if needed ### Issue #3: CORS Configuration Too Permissive **Severity:** HIGH **Risk:** CSRF attacks, unauthorized API access **Problem:** ```python allow_origins=["*"] # Allows ANY origin ``` **Fix Required:** - Restrict to specific allowed origins - Use environment variable for production domains ### Issue #4: Missing Input Validation **Severity:** HIGH **Risk:** DoS attacks, malicious file uploads **Problem:** - No file size limits enforced - No file content validation - No rate limiting **Fix Required:** - Add max file size validation - Add file content scanning - Implement rate limiting --- ## 3) 🟠 Important Improvements ### Improvement #1: Enhanced Hallucination Prevention **Current:** Good prompts, but could be stricter **Recommendations:** - Add explicit "DO NOT USE PRIOR KNOWLEDGE" in every prompt - Add verification step: check if answer is actually in context - Lower temperature further (0.0 for maximum determinism) ### Improvement #2: Better Error Handling **Current:** Generic error messages **Recommendations:** - Don't expose internal errors to users - Add structured error codes - Log errors with context for debugging ### Improvement #3: Collection Isolation Strategy **Current:** Single shared collection **Recommendations:** - Option A: Per-tenant collections (strongest isolation) - Option B: Composite collection names (tenant_id + kb_id) - Option C: Keep shared but add strict filtering (current + fixes) ### Improvement #4: Metadata Completeness **Current:** Missing tenant_id, document_id **Recommendations:** - Add `tenant_id` to all chunks - Add `document_id` for tracking - Add `upload_timestamp` for audit --- ## 4) 🟡 Optional Improvements ### Optional #1: Better Chunking Strategy - Consider semantic chunking (by topic/heading) - Add heading-aware chunking for structured docs - Improve overlap calculation ### Optional #2: Query Enhancement - Add query expansion (synonyms, related terms) - Add query rewriting for better retrieval - Consider hybrid search (keyword + semantic) ### Optional #3: Monitoring & Observability - Add metrics (retrieval latency, confidence scores) - Add tracing for debugging - Add alerting for low confidence rates ### Optional #4: Caching - Cache embeddings for frequently accessed docs - Cache retrieval results for common queries - Add Redis for production --- ## 5) 🔐 Security & Multi-Tenant Issues ### Security Issues Found: 1. **No Authentication** - Endpoints are public 2. **No Authorization** - No user ownership verification 3. **CORS Too Open** - Allows all origins 4. **No Rate Limiting** - Vulnerable to DoS 5. **File Upload Risks** - No size/content validation 6. **Error Information Leakage** - Internal errors exposed 7. **Shared Collection** - All tenants in same DB collection ### Multi-Tenant Isolation Issues: 1. **Missing tenant_id** - Cannot properly isolate tenants 2. **Weak Filtering** - Only user_id + kb_id (not sufficient) 3. **No Tenant Validation** - No check that user belongs to tenant 4. **Collection Sharing** - All data in one collection --- ## 6) 📌 Code Changes Made See `FIXES_APPLIED.md` for detailed changes. **Summary of fixes:** 1. Added `tenant_id` to metadata and filtering 2. Enhanced prompts for stricter hallucination prevention 3. Added input validation for file uploads 4. Improved error handling 5. Added security middleware stubs 6. Enhanced logging --- ## 7) ✅ Recommended Configuration Values ```env # Chunking (optimized for retrieval quality) CHUNK_SIZE=600 # Increased from 500 for better context CHUNK_OVERLAP=150 # Increased from 100 for better continuity MIN_CHUNK_SIZE=100 # Increased from 50 to avoid tiny chunks # Retrieval (balanced for quality) TOP_K=6 # Good balance SIMILARITY_THRESHOLD=0.40 # Increased from 0.35 for stricter filtering # LLM (anti-hallucination) TEMPERATURE=0.0 # Lowered from 0.1 for maximum determinism MAX_CONTEXT_TOKENS=3000 # Reduced from 4000 to focus on top results # Security MAX_FILE_SIZE_MB=50 # Limit file uploads ALLOWED_ORIGINS=https://yourdomain.com,https://app.yourdomain.com ``` --- ## 8) 🚀 Deployment Checklist ### Pre-Deployment: - [ ] Add tenant_id to all existing data (migration script) - [ ] Configure authentication middleware - [ ] Set CORS to production domains - [ ] Add rate limiting - [ ] Configure file size limits - [ ] Set up monitoring/logging - [ ] Run security scan - [ ] Load testing ### Production Configuration: - [ ] Use managed vector DB (Pinecone/Weaviate) or isolated ChromaDB instances - [ ] Enable HTTPS only - [ ] Set up API keys/authentication - [ ] Configure backup strategy - [ ] Set up alerting - [ ] Document API endpoints - [ ] Create runbook for operations ### Post-Deployment: - [ ] Monitor error rates - [ ] Track confidence scores - [ ] Monitor retrieval quality - [ ] Collect user feedback - [ ] Iterate on prompts based on real usage --- ## Next Steps 1. **IMMEDIATE:** Fix multi-tenant isolation (add tenant_id) 2. **URGENT:** Add authentication/authorization 3. **HIGH:** Fix CORS and input validation 4. **MEDIUM:** Enhance prompts and error handling 5. **LOW:** Add monitoring and optimizations