Boot-Time Memory Device Authorization via Endorsement Service
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Solution Overview
Problem
In computing environments requiring high performance and security, the integration of incompatible or unauthorized devices, such as memory devices, can negatively impact system performance, compatibility, and security, making it difficult for administrators to identify and prevent their use.
Innovation Solution
Implementing a firmware, compliant with the Unified Extensible Firmware Interface (UEFI) Specification, to identify memory devices upon power-on, obtain unique identifying information, and utilize an endorsement service to authorize or disable devices based on inventory data, with cryptographic hashing for authentication and authorization stored in a trusted platform module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If device identification and authorization mechanisms are implemented, then system security and compatibility are improved, but device complexity and operational overhead increase
Solution Approach 1:
The firmware performs device identification and authorization checks during the boot process before the operating system loads. This preliminary action ensures that only authorized devices are recognized and initialized, preventing security risks without requiring continuous monitoring or complex runtime validation mechanisms.
Solution Approach 2:
The patent introduces an endorsement service as an intermediary component that mediates between the firmware and the operating system. This service handles the complex authorization logic centrally, allowing the firmware to remain relatively simple while still providing robust device verification through the endorsement service layer.
2Reliability
If comprehensive device authorization is performed, then unauthorized device usage is prevented, but system boot time and operational delay increase
Solution Approach 1:
Device authorization is performed during the firmware boot process before the operating system initializes. This preliminary verification ensures that only authorized devices are available to the operating system, eliminating the need for runtime authorization checks and minimizing overall system boot time.
Solution Approach 2:
The endorsement service rapidly verifies device authorization status during boot using pre-stored endorsement data structures. By using efficient data structures and pre-computed authorization decisions, the system rushes through the verification process without significant delay, allowing rapid boot while maintaining security.
Data Source
AI summary
A firmware executes upon power on of a processing system and identifies any memory devices present in the processing system. The firmware then obtains uniquely identifying information for the memory devices such as, for example, part numbers and serial numbers. If the boot is the first boot of the processing system, the firmware transmits the uniquely identifying information for the memory devices to an endorsement service. The endorsement service, in turn, receives the identifying information and consults inventory data to determine if the memory devices are authorized for use in the processing system. The endorsement service then returns a response to the processing system that identifies any of the memory devices that are not authorized for use with the processing system. Upon receiving the response, the firmware disables any memory devices identified by the endorsement service as not being authorized for use with the processing system.