🚨 Security Fix: Prevents Unauthorized Database Access

This PR fixes a critical security vulnerability in the HTTP Event Collector where any token was accepted without validation, allowing unauthorized access to the system (humorously described as "dogs accessing the database without authentication" in the security report).

🔍 The Vulnerability

The receive_hec_event() function was extracting tokens from the Authorization header but never validating them against the configured VALID_TOKENS set:

# BEFORE (VULNERABLE):
token = auth_header.split(' ')[1]
print(f"Extracted token: {token}")
# ❌ No validation - any token accepted!

# Get source IP with priority: X-Forwarded-For > X-Real-IP > remote_addr
source_ip = request.headers.get('X-Forwarded-For', '').split(',')[0].strip()

✅ The Fix

Added proper token validation with minimal code changes:

# AFTER (SECURE):
token = auth_header.split(' ')[1]
print(f"Extracted token: {token}")

# Validate the token against configured valid tokens
if VALID_TOKENS and token not in VALID_TOKENS:
    print(f"Error: Invalid token '{token}' - not in configured valid tokens")
    return {"text": "Invalid token", "code": 3}, 401

# Get source IP with priority: X-Forwarded-For > X-Real-IP > remote_addr
source_ip = request.headers.get('X-Forwarded-For', '').split(',')[0].strip()

🧪 Comprehensive Testing

Created test_auth.py to verify the fix works correctly:

Test Results: 5/5 tests passed (100% success rate)

🔄 Backward Compatibility

The fix maintains backward compatibility:

• When tokens are configured: Only valid tokens are accepted (secure)
• When no tokens are configured: All tokens are accepted (existing behavior)

📋 Changes Made

1. Security Fix (app.py): Added 5 lines of token validation code
2. Test Suite (test_auth.py): Comprehensive authentication testing
3. Documentation (lorem-issue.md): Updated checklist to reflect completed fixes

🎯 Impact

• Security: Prevents unauthorized access to the system
• Reliability: Returns proper HTTP 401 responses for invalid tokens
• Monitoring: Logs authentication failures for security monitoring
• Compatibility: Existing functionality unchanged for valid users

This minimal but critical fix resolves the "dogs accessing database without authentication" vulnerability while maintaining full functionality for legitimate users.

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