SQL INJECTION VULNERABILITY FIXES - VERIFICATION GUIDE
=====================================================

FILES MODIFIED:
--------------
1. api/services/conversation_context_service.py
2. api/routers/conversation_contexts.py

CHANGES SUMMARY:
---------------

FILE 1: api/services/conversation_context_service.py
----------------------------------------------------

Line 13: ADDED import
  OLD: from sqlalchemy import or_, text
  NEW: from sqlalchemy import or_, text, func

Lines 178-201: FIXED search_term SQL injection
  OLD:
    if search_term:
        fulltext_match = text(
            "MATCH(title, dense_summary) AGAINST(:search_term IN NATURAL LANGUAGE MODE)"
        ).bindparams(search_term=search_term)
        
        query = query.filter(
            or_(
                fulltext_match,
                ConversationContext.title.like(f"%{search_term}%"),        # VULNERABLE
                ConversationContext.dense_summary.like(f"%{search_term}%")  # VULNERABLE
            )
        )
  
  NEW:
    if search_term:
        try:
            fulltext_condition = text(
                "MATCH(title, dense_summary) AGAINST(:search_term IN NATURAL LANGUAGE MODE)"
            ).bindparams(search_term=search_term)
            
            like_condition = or_(
                ConversationContext.title.like(func.concat('%', search_term, '%')),        # SECURE
                ConversationContext.dense_summary.like(func.concat('%', search_term, '%'))  # SECURE
            )
            
            query = query.filter(or_(fulltext_condition, like_condition))
        except Exception:
            like_condition = or_(
                ConversationContext.title.like(func.concat('%', search_term, '%')),
                ConversationContext.dense_summary.like(func.concat('%', search_term, '%'))
            )
            query = query.filter(like_condition)

Lines 210-220: FIXED tags SQL injection
  OLD:
    if tags:
        tag_filters = []
        for tag in tags:
            tag_filters.append(ConversationContext.tags.like(f'%"{tag}"%'))  # VULNERABLE
        if tag_filters:
            query = query.filter(or_(*tag_filters))
  
  NEW:
    if tags:
        # Use secure func.concat to prevent SQL injection
        tag_filters = []
        for tag in tags:
            tag_filters.append(
                ConversationContext.tags.like(func.concat('%"', tag, '"%'))  # SECURE
            )
        if tag_filters:
            query = query.filter(or_(*tag_filters))


FILE 2: api/routers/conversation_contexts.py
--------------------------------------------

Lines 79-90: ADDED input validation for search_term
  NEW:
    search_term: Optional[str] = Query(
        None,
        max_length=200,
        pattern=r'^[a-zA-Z0-9\s\-_.,!?()]+$',  # Whitelist validation
        description="Full-text search term (alphanumeric, spaces, and basic punctuation only)"
    ),

Lines 86-90: ADDED validation for tags
  NEW:
    tags: Optional[List[str]] = Query(
        None,
        description="Filter by tags (OR logic)",
        max_items=20  # Prevent DoS
    ),

Lines 121-130: ADDED runtime tag validation
  NEW:
    # Validate tags to prevent SQL injection
    if tags:
        import re
        tag_pattern = re.compile(r'^[a-zA-Z0-9\-_]+$')
        for tag in tags:
            if not tag_pattern.match(tag):
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail=f"Invalid tag format: '{tag}'. Tags must be alphanumeric with hyphens or underscores only."
                )


TESTING THE FIXES:
-----------------

Test 1: Valid Input (should work - HTTP 200)
  curl "http://172.16.3.30:8001/api/conversation-contexts/recall?search_term=test" \
    -H "Authorization: Bearer $JWT_TOKEN"

Test 2: SQL Injection Attack (should be rejected - HTTP 422)
  curl "http://172.16.3.30:8001/api/conversation-contexts/recall?search_term=%27%20OR%20%271%27%3D%271" \
    -H "Authorization: Bearer $JWT_TOKEN"

Test 3: Tag Injection (should be rejected - HTTP 400)
  curl "http://172.16.3.30:8001/api/conversation-contexts/recall?tags[]=%27%20OR%20%271%27%3D%271" \
    -H "Authorization: Bearer $JWT_TOKEN"


KEY SECURITY IMPROVEMENTS:
-------------------------

1. NO F-STRING INTERPOLATION IN SQL
   - All LIKE patterns use func.concat()
   - All parameterized queries use .bindparams()

2. INPUT VALIDATION AT ROUTER LEVEL
   - Regex pattern enforcement
   - Length limits
   - Character whitelisting

3. RUNTIME TAG VALIDATION
   - Additional validation in endpoint
   - Prevents bypass of Query validation

4. DEFENSE IN DEPTH
   - Multiple layers of protection
   - Validation + Parameterization + Database escaping


DEPLOYMENT NEEDED:
-----------------
These changes are in D:\ClaudeTools but need to be deployed to the running API server at 172.16.3.30:8001

After deployment, run: bash test_sql_injection_simple.sh