Server Handler for SQL Injection Protection

The patent introduces a handler as an intermediary component between the client and the service. This handler intercepts all messages, performs input validation to detect SQL injection attempts, and performs output validation to prevent information leakage. By placing this security layer in the message flow path, the system achieves comprehensive protection without requiring modifications to the underlying service logic, thus improving security while managing complexity through a dedicated intermediary component.

The handler performs input validation on request messages before they are processed by the service, and performs output validation on response messages before they are sent to the client. By conducting these validation checks in advance (preliminary action), the system prevents malicious inputs from reaching the service logic and filters sensitive information before transmission, thereby maintaining security while optimizing the timing of validation operations to minimize processing delays.

The patent inverts the traditional error handling approach by performing output validation on response messages to detect and filter sensitive information before it reaches the client. Instead of allowing database error messages to be directly returned (which would expose internal structures), the handler intercepts these messages, identifies sensitive content, and prevents their transmission. This inversion prioritizes information security while still maintaining operational functionality by blocking only the harmful error details.