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Enabling secure boot later on (lemmy.ml)

submitted 1 year ago by [email protected] to c/[email protected]

17 comments fedilink hide all child comments

So, I've installed Manjaro quite while ago, and I let secure boot disabled during installation. Dang! Is there a way to keep (most of) my system and enable secure boot and LUKS after the fact?

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[–] [email protected] 5 points 1 year ago* (last edited 1 year ago) (2 children)

It depends on a single variable - does your motherboard support manipulating the secure boot keys? I've only done it on prebuilt dells and dell laptops, but some other manufacturers also allow it.

The procedure is very simple, but has many steps. Don't get discouraged! I remember ArchWiki having a very thorough guide that worked for me.

The gist of it is you provide UEFI firmware the cert to trust and then use the keys to sign your kernel image. I've never had to deal with signing the modules (mostly nVidia related, I think), but the procedure would be the same.

[–] [email protected] 5 points 1 year ago (1 children)

I had it scripted at some point - this is the file

Line 6 creates the UKI
Line 9 signs it
Line 12 changes the boot order.

Good luck!

[–] [email protected] 2 points 1 year ago (1 children)

That's a 404 ...

[–] [email protected] 3 points 1 year ago (1 children)

My bad, private repo. Here's the content:

#!/bin/zsh

# 2022.09.26

# Generate
dracut --quiet --zstd --kver 6.0.2-gentoo --filesystems btrfs --early-microcode --uefi --uefi-splash-image $HOME/Nextcloud/Pictures/gentoo.full.height.nvme.bmp --uefi-stub /usr/lib/systemd/boot/efi/linuxx64.efi.stub --no-machineid --stdlog 4 --force --kernel-cmdline "rd.luks=1 rd.lvm=0 rd.md=0 rd.dm=0 rd.fstab=1 root=UUID=f5f8d75d-8aa8-4cea-83f9-3489a92a23e0 rd.luks.key=/luks.key:UUID=8E55-4050 rd.luks.uuid=5f5ab8ff-f1ea-4c09-960a-73f9bf5b7698 rootflags=noatime,discard=async,subvol=@snapshots/root/2022-10-18_102847 rootfstype=btrfs quiet delayacct i915.enable_guc=3"

# Sign
sbsign --key secure-boot/db.key --cert secure-boot/db.crt --output /boot/EFI/Linux/linux-6.0.2-gentoo.signed.efi /boot/EFI/Linux/linux-6.0.2-gentoo.efi

# Change boot order
efibootmgr --create --disk /dev/sdb --loader EFI/Linux/linux-6.0.2-gentoo.signed.efi --label Gentoo-6.0.2-signed --part 3 --verbose

[–] [email protected] 2 points 1 year ago

I have since replaced the hardcoded values with variables, but evidently haven't pushed the changes to gitlab. Having said that - not having variables might make it easier to understand in this case.

[–] [email protected] 4 points 1 year ago (1 children)

I think, I can install keys in my AMI bios. So, basically, I'd create some keys, sign the kernel with it, reboot, install them keys in UEFI, enable secure boot, and, fingers crossed, I'd boot?

[–] [email protected] 1 points 1 year ago

You might have to enable Audit mode or similar - again, depends on the manufacturer - to generate the keys. But yes, essentially that's the gist of it.