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README.md

Lanzaboote

GitHub branch checks state made-with-rust GitHub license

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This repository contains experimental tooling for Secure Boot on NixOS.

High-Level Boot Flow

flowchart LR
    systemd[systemd-boot]
	lanzaboote[lanzaboote]
	kernel[Linux Kernel]
	
	systemd --> lanzaboote
	lanzaboote --> kernel

lanzatool

lanzatool is a Linux command line application that takes a bootspec document and installs the boot files into the UEFI ESP.

To make systemd-boot recognize a new boot target, lanzatool builds a UKI image. To avoid having to embed kernel and initrd, we use a custom stub lanzaboote (see below) that loads kernel and initrd from the ESP.

lanzaboote

lanzaboote is the stub that lanzatool uses to form an UKI. It loads a Linux kernel and initrd without breaking the Secure Boot chain of trust. Instead of rolling our own crypto, lanzaboote re-uses the signature verification that is built-in to UEFI.

Relevant Nixpkgs Work

This project depends on upstream nixpkgs work:

You can find everything integrated as PoC here.