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docs: update README

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# Lanzaboote
# Lanzaboote: Secure Boot for NixOS
[![Chat on Matrix](https://matrix.to/img/matrix-badge.svg)](https://matrix.to/#/#nixos-secure-boot:ukvly.org)
![GitHub branch checks state](https://img.shields.io/github/checks-status/blitz/lanzaboote/master)
[![made-with-rust](https://img.shields.io/badge/Made%20with-Rust-1f425f.svg)](https://www.rust-lang.org/)
[![GitHub license](https://img.shields.io/github/license/blitz/lanzaboot.svg)](https://github.com/blitz/lanzaboote/blob/master/LICENSE)
![GitHub](https://img.shields.io/github/license/blitz/lanzaboote)
🚧🚧🚧 **This is not working yet. Come back later.** 🚧🚧🚧
🚧🚧🚧 **This is not ready for non-developer usage.** 🚧🚧🚧
This repository contains experimental tooling for Secure Boot on
[NixOS](https://nixos.org/).
Remaining high-level things to do:
## 🪛 To Do 🪛
There is a bunch of work to do. Please coordinate in the [Matrix
room](https://matrix.to/#/#nixos-secure-boot:ukvly.org), if you want
to take something up:
- Overview documentation about the approach
- Document a experimental setup for developers on how to use this repository
- Coordinate with bootspec RFC stakeholders to communicate a experience report on the bootspec usage ;
- Upstream as much as possible things: Rust unstable things on a stable compiler (?), etc. ;
- Unit testing for `lanzatool` ;
- Investigating how this can fit into systemd-boot theory about sysexts for initrds while keeping NixOS semantics ;
- Threat modelling explanations: "bring your own PKI", "share your PKI with MSFT CA", "bring rhboot shim with MOK", etc. ;
- Ensuring 99 % of the paths are "happy paths" : protecting user against bricking their machines, identifying sources of risk, communicating intent and detecting risks ;
- Experimenting with `fwupd`
- Coordinate with bootspec RFC stakeholders to communicate a experience report on the bootspec usage
- Upstream nixpkgs work
- Lanzatool
- Lanzaboote (needs unstable Rust!)
- NixOS boot loader installation etc.
- Unit testing for Lanzatool
- Investigating how this can fit into systemd-boot theory about sysexts for initrds while keeping NixOS semantics
- Threat modelling explanations: "bring your own PKI", "share your PKI with MSFT CA", "bring rhboot shim with MOK", etc.
- Ensuring 99 % of the paths are "happy paths" : protecting user against bricking their machines, identifying sources of risk, communicating intent and detecting risks
- Experimenting with `fwupd` / Green Checkmark in GNOME Device Security
- https://github.com/fwupd/fwupd/issues/5284
- Experimenting with TPM2 measurements
- Studying the initrd secrets feature in NixOS wrt SecureBoot & TPM2
- ...
## High-Level Boot Flow
```mermaid
flowchart LR
systemd[systemd-boot]
systemd[systemd-boot]
lanzaboote[lanzaboote]
kernel[Linux Kernel]