Ownership Voucher API for Secure Network Device Bootstrapping
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Solution Overview
Problem
Existing network devices lack an efficient and secure method for self-configuration during bootup, particularly in scenarios where they are not pre-configured, leading to potential security vulnerabilities and operational inefficiencies.
Innovation Solution
An application programming interface (API) is introduced to manage ownership vouchers, allowing organizations to define an organization tree and control access to these vouchers based on hierarchical relationships, ensuring secure and efficient configuration of network devices through a bootstrapping process using DHCP and bootstrap servers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual ownership voucher distribution is used, then security is maintained through controlled access, but provisioning efficiency and speed are reduced
Solution Approach 1:
The system enables network devices to automatically obtain ownership vouchers through DHCP requests without manual intervention. Devices self-provision by sending DHCP requests to the DHCP server, which automatically responds with ownership voucher information, eliminating the need for manual voucher distribution while maintaining security through authenticated access.
Solution Approach 2:
The DHCP server acts as an intermediary between the ownership voucher storage system and network devices. It receives DHCP requests from devices, retrieves appropriate ownership vouchers from the backend system, and distributes them to devices automatically. This intermediary mechanism enables efficient automated provisioning while maintaining controlled access through the backend authorization system.
2Speed
If automated DHCP-based voucher distribution is implemented, then provisioning speed improves, but access control security may be compromised
Solution Approach 1:
The system performs preliminary authorization checks before distributing ownership vouchers. The DHCP server validates device credentials and authorization tokens before releasing voucher information, ensuring that only authenticated devices receive vouchers. This preliminary security check maintains access control integrity while enabling automated fast provisioning for authorized devices.
Solution Approach 2:
Different security measures are applied at different stages of the provisioning process. The DHCP request stage uses basic authentication, while the voucher issuance stage uses enhanced authorization validation. This localized quality approach ensures appropriate security levels are applied at each step, maintaining overall security while enabling automated distribution.
3Reliability
If centralized voucher management is used, then security and control are improved, but system complexity increases
Solution Approach 1:
The DHCP server is enhanced to perform multiple functions: it continues to provide standard DHCP services (IP address assignment, DNS configuration) while also serving as an ownership voucher distribution point. This multi-functionality consolidates voucher management within an existing infrastructure component, maintaining security through centralized control without adding separate complex voucher management systems.
Solution Approach 2:
The ownership voucher management functionality is merged with the existing DHCP server infrastructure. The voucher distribution process is integrated into the standard DHCP handshake, combining two previously separate functions (DHCP service and voucher distribution) into a single unified system, thereby reducing overall system complexity while maintaining centralized security control.
Data Source
AI summary
An organization tree comprises nodes which represent different groups within an organization. The nodes are associated with users and devices in the organization. When a user requests an ownership voucher to install a device, the request is validated before an ownership voucher is generated. The validation includes at least verifying that the node the user is associated with is either the same node as the node of the device or is an ancestor node of the device.