yubikey-full-disk-encryption VS pam-u2f

Would using this be possible? https://github.com/agherzan/yubikey-full-disk-encryption/tree/master/src

> Hibernate is less interesting, and apparently unsupported using secure boot anyway.

That's not the case. I have a similar setup to yours (/ on ext4 with separate swap, on LVM on LUKS, separate /efi) and my box hibernates just fine with secure boot and auto-unlock via TPM.

The difference with your setup is I don't use grub, but have the UEFI load a signed unified kernel image directly. Since this works so well, I never had a reason to mess around with yet another moving piece (grub or other bootloader).

As another commenter said, I haven't attempted to mess around with the MOK. I just replaced all the secure boot keys with my own, and I've also signed MS's Windows key (but not the 3rd party one) for my dual-boot needs.

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For specifics: This is an up-to-date Arch Linux install, running on an HP EliteBook 840 G8 (11th gen intel). I know Debian may have older components than arch, but this setup has been working for more than a year now.

IIRC, the most significant change was brought by systemd 251 which started supporting auto-unlocking LUKS with the TPM. Before that, on an older computer with the same general setup, hibernation worked well, too. I just needed to input the unlock password (which I was too lazy to do, so I just used my yubikey - see https://github.com/agherzan/yubikey-full-disk-encryption).

Does yubikey-full-disk-encryption provide anything systemd 253 doesn't now?

Do you mean something like this: https://github.com/agherzan/yubikey-full-disk-encryption

Full disk encryption is rarely as portable as simply encrypting the files you need. When I ran a “homemade” NAS, I had everything LUKS encrypted. I used a Yubikey to unlock the encrypted data.

A few days ago I akquiriere a Yubikey and I'm currently trying to set up 2FA with the Yubikey and a password to unlock the LUKS container. Since I am running Arch I came across the yubikey-full-disk-encryption package and tested it in an Arch VM. So far it worked really well. The only issue I am having is that compared to my old setup I need to have /boot unencrypted because it seems GRUB itself cannot deal with the 2FA setup and ykfde if /boot is encrypted. Previously I had most of /boot inside the LUKS volume with only the /efi part unencrypted (this is used when telling grub where the efi-directory is - see the previous guide for the full details please) and the GRUB_ENABLE_CRYPTODISK=y option set in the GRUB config.

I don't know about the hanging, I use yubikey-full-disk-encryption which uses challenge-response (1FA or 2FA) which you can set up how many attempts to use the YubiKey before it falls back to the passphrase.

Related: https://github.com/agherzan/yubikey-full-disk-encryption

https://github.com/cornelinux/yubikey-luks or https://github.com/agherzan/yubikey-full-disk-encryption with yubikey 5 will get you going. It is a bit expensive to get two keys (regular and backup), but these can be also used to secure most of the online accounts.