Version: v0.5 - Work in Progress
The concept of a Platform Root of Trust (PRoT) is central to establishing a secure computing environment. A PRoT is a trusted component within a system that serves as the foundation for all security operations. It is responsible for ensuring that the system boots securely, verifying the integrity of the firmware and software, and performing critical cryptographic functions. By acting as a trust anchor, the PRoT provides a secure starting point from which the rest of the system's security measures can be built. This is particularly important in an era where cyber threats are becoming increasingly sophisticated, targeting the lower layers of the computing stack, such as firmware, to gain persistent access to systems.
OpenPRoT is a project intended to enhance the security and transparency of PRoTs by defining and building an open source firmware stack that can be run on a variety of hardware implementations. Open source firmware offers several benefits that can enhance the effectiveness and trustworthiness of a PRoT. Firstly, open source firmware allows for greater transparency, as the source code is publicly available for review and audit. This transparency helps identify and mitigate vulnerabilities more quickly, as a global community of developers and security experts can scrutinize the code. It also reduces the risk of hidden backdoors or malicious code, which can be a concern with proprietary firmware.
Moreover, an open source firmware stack can foster innovation and collaboration within the industry. By providing a common platform that is accessible to all, developers can contribute improvements, share best practices, and develop new security features that benefit the entire ecosystem. This collaborative approach can lead to more robust and resilient firmware solutions, as it leverages the collective expertise of a diverse community. Additionally, open source firmware can enhance interoperability and reduce vendor lock-in, giving organizations more flexibility in choosing hardware and software components that best meet their security needs.
Incorporating an open source firmware stack into a PRoT not only strengthens the security posture of a system but also aligns with broader industry trends towards openness and collaboration. As organizations increasingly recognize the importance of securing the foundational layers of their computing environments, the combination of a PRoT with open source firmware represents a powerful strategy for building trust and resilience in the face of evolving cyber threats.
Today's Platform Root of Trust (PRoT) solutions are often specifically designed for their target platform, relying on custom interfaces or protocols. This leads to slower time-to-market due to the integration effort required. Customers can become locked into a single solution, making it costly and time-consuming to change suppliers, which in turn introduces supply chain risks.
The Open Platform Root-of-Trust (OpenPRoT) stack is an open and extensible standards-compliant root-of-trust firmware stack for use in root-of-trust elements. The project was initiated to create an OCP specification for a Platform Root of Trust software stack, along with an open-source implementation of that specification. The OpenPRoT stack provides base root-of-trust services in an open architecture that allows hardware vendors to provide both standard and value-added services.
The vision of the OpenPRoT project is to enable implementation consistency, transparency, openness, reusability, and interoperability. The primary goals of the project are to:
OpenPRoT is designed to be a standards-based and interoperable Platform Root of Trust (PRoT) solution. This ensures that OpenPRoT can be integrated into a wide range of platforms and that it leverages proven and well-defined security and management protocols.
The OpenPRoT architecture is designed to be a flexible and extensible platform Root of Trust (PRoT) solution. It is built upon a layered approach that abstracts hardware-specific implementations, providing standardized interfaces for higher-level applications. This architecture promotes reusability, interoperability, and a consistent security posture across different platforms.
The following block diagram illustrates the high-level architecture of OpenPRoT.
The OpenPRoT architecture can be broken down into the following layers:
