Re: EFI Secure Boot Build Support

[sgn <sgn@users.noreply.github.com>]

[-- Attachment #1: Type: text/plain, Size: 1927 bytes --]

New comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/issues/12495#issuecomment-664795753

Comment:
On 2020-07-27 22:50:51-0700, Érico Nogueira Rolim <notifications@github.com> wrote:
> Signing the shim is a pain, requires payment, and then I believe we'd also have to sign the kernel *and* modules, which is another source of pain, so I don't think we should go that route.
> 
> @unixandria-xda  From my experience, the easiest route for Secure Boot is simply to not depend on GRUB:
> 
> - create SB keys (using openssl commands or something like https://github.com/Foxboron/sbctl - which unfortunately doesn't have a release yet)
> - configure dracut for UEFI bundle generation (using #22484, manual

And #22484 is expected to be merged, soon.

> configuration or something like
> https://github.com/zdykstra/zfsbootmenu - this last one is shipped
> on Void): this will create a bundle that contains the kernel, the
> cmdline, and the initramfs

> - add the `secureboot_*` options to your dracut config, so dracut
> can sign the bundle at creation time; or extend the sbsigntool hook
> to sign UEFI bundles (#23688 ?); or create a sbctl hook to sign them

FWIW, #23688 will be updated once #22484 has been merged.

> (not supported yet)
> - boot into the UEFI bundle directly (could have efibootmgr
> integration?) or into something like rEFInd, whose `refind-install`
> script can sign the refind executable

In order to do secure boot with rEFInd,
we need to sign both rEFInd efi bootloader,
and the kernel.

The refind-install only sign rEFInd binaries and other binaries
shipped by them. We still need to sbsigntool/other hooks to sign newly
installed kernel.

> 
> The only part that I don't understand much about is enrolling keys, because I do it through my own firmware.

`efitools` provides userspace tools and `efitools-efi` package provides EFI binaries to do it.

-- 
Danh