Somoru f0ba83c2ad security: comprehensive hardening of multi-user implementation
Production-ready security improvements:

1. Password Security Enhancements:
   - Increased minimum password length from 4 to 8 characters
   - Added maximum length limit (100 chars) to prevent DoS
   - Migration now validates password exists and is not empty
   - Proper validation before creating admin user

2. Timing Attack Prevention:
   - Implemented constant-time comparison using crypto.timingSafeEqual
   - Added dummy hash computation for non-existent users
   - Prevents username enumeration via timing analysis

3. Comprehensive Input Validation:
   - Username: 3-50 chars, alphanumeric + . _ - only
   - Email: Format validation, 100 char limit
   - All validation centralized in user_management service
   - Proper error messages without leaking info

4. Code Quality Improvements:
   - Fixed parseInt() calls to use radix 10 and check NaN
   - Added try-catch for validation errors in API routes
   - Improved error handling throughout

5. Security Documentation:
   - Added comprehensive 'Security Considerations' section
   - Documented implemented protections
   - Listed recommended infrastructure-level protections
   - Documented known limitations (username enumeration, etc.)
   - Clear guidance on rate limiting, HTTPS, monitoring

All changes maintain backward compatibility and pass TypeScript validation.
Zero errors, production-ready security posture.
2025-10-21 16:44:35 +05:30
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