2.6 KiB
fido2luks 
This will allow you to unlock your luks encrypted disk with an fido2 compatible key
Note: This has only been tested under Fedora 31 using a Solo Key, Trezor Model T
Setup
Prerequisites
dnf install cargo cryptsetup-devel -y
Device
git clone https://github.com/shimunn/fido2luks.git && cd fido2luks
#Alternativly cargo build --release && sudo cp target/release/fido2luks /usr/bin/
CARGO_INSTALL_ROOT=/usr sudo -E cargo install -f --path .
echo FIDO2LUKS_CREDENTIAL_ID=$(fido2luks credential) >> dracut/96luks-2fa/fido2luks.conf
set -a
. dracut/96luks-2fa/fido2luks.conf
#Repeat for each luks volume
sudo -E fido2luks -i add-key /dev/disk/by-uuid/<DISK_UUID>
#Test(only works if the luks container isn't active)
sudo -E fido2luks -i open /dev/disk/by-uuid/<DISK_UUID> luks-<DISK_UUID>
Dracut
cd dracut
sudo make install
Grub
Add rd.luks.2fa=<CREDENTIAL_ID>:<DISK_UUID> to GRUB_CMDLINE_LINUX in /etc/default/grub
Note: This is only required for your root disk, systemd will try to unlock all other luks partions using the same key if you added it using fido2luks add-key
grub2-mkconfig > /boot/grub2/grub.cfg
I'd also recommend to copy the executable onto /boot so that it is accessible in case you have to access your disk from a live system
mkdir /boot/fido2luks/
cp /usr/bin/fido2luks /boot/fido2luks/
cp /etc/fido2luks.conf /boot/fido2luks/
Test
Just reboot and see if it works, if thats the case you should remove your old less secure password from your luks header:
#Recommend in case you lose your authenticator, store this backupfile somewhere safe
cryptsetup luksHeaderBackup /dev/disk/by-uuid/<DISK_UUID> --header-backup-file luks_backup_<DISK_UUID>
#There is no turning back if you mess this up, make sure you made a backup
fido2luks -i add-key --exclusive /dev/disk/by-uuid/<DISK_UUID>
Addtional settings
Password less
Remove your previous secret as described in the next section, incase you already added one.
Open /etc/fido2luks.conf and replace FIDO2LUKS_SALT=Ask with FIDO2LUKS_SALT=string:<YOUR_RANDOM_STRING>
Import the new config into env:
set -a
. /etc/fido2luks.conf
Then add the new secret to each device and update dracut afterwards dracut -f
Removal
Remove rd.luks.2fa from GRUB_CMDLINE_LINUX in /etc/default/grub
set -a
. fido2luks.conf
sudo -E fido2luks -i replace-key /dev/disk/by-uuid/<DISK_UUID>
sudo rm -rf /usr/lib/dracut/modules.d/96luks-2fa /etc/dracut.conf.d/luks-2fa.conf