This will allow you to unlock your LUKS encrypted disk with an FIDO2 compatible key.
Note: This has only been tested under Fedora 31, Ubuntu 20.04, NixOS using a Solo Key, Trezor Model T
dnf install clang cargo cryptsetup-devel -y
git clone https://github.com/shimunn/fido2luks.git && cd fido2luks
# Alternativly cargo build --release && sudo cp target/release/fido2luks /usr/bin/
sudo -E cargo install -f --path . --root /usr
# Copy template
cp dracut/96luks-2fa/fido2luks.conf /etc/
# Name is optional but useful if your authenticator has a display
echo FIDO2LUKS_CREDENTIAL_ID=$(fido2luks credential [NAME]) >> /etc/fido2luks.conf
# Load config into env
set -a
. /etc/fido2luks.conf
# Repeat for each luks volume
# You can also use the `--token` flag when using LUKS2 which will then store the credential in the LUKS header,
# enabling you to use `fido2luks open-token` without passing a credential as parameter
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>
cd dracut
sudo make install
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 rescue system
mkdir /boot/fido2luks/
cp /usr/bin/fido2luks /boot/fido2luks/
cp /etc/fido2luks.conf /boot/fido2luks/
Just reboot and see if it works, if that's 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
# You can also pass `--token` if you're using LUKS2 which will then store the credential in the LUKS header,
# which will enable you to use `fido2luks open-token` without passing a credential as parameter
fido2luks -i add-key --exclusive /dev/disk/by-uuid/<DISK_UUID>
Remove your previous secret as described in the next section, in case you've already added one.
Open /etc/fido2luks.conf
and replace FIDO2LUKS_SALT=Ask
with FIDO2LUKS_SALT=string:<YOUR_RANDOM_STRING>
but be warned that this password will be included to into your initramfs.
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
Additional/backup keys are supported, Multiple fido2luks credentials can be added to your /etc/fido2luks.conf file. Credential tokens are comma separated.
FIDO2LUKS_CREDENTIAL_ID=<CREDENTIAL1>,<CREDENTIAL2>,<CREDENTIAL3>
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 /etc/fido2luks.conf
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