78 lines
2.8 KiB
Markdown
78 lines
2.8 KiB
Markdown
# LUKS-Encrypted File Systems {#sec-luks-file-systems}
|
|
|
|
NixOS supports file systems that are encrypted using *LUKS* (Linux
|
|
Unified Key Setup). For example, here is how you create an encrypted
|
|
Ext4 file system on the device
|
|
`/dev/disk/by-uuid/3f6b0024-3a44-4fde-a43a-767b872abe5d`:
|
|
|
|
```ShellSession
|
|
# cryptsetup luksFormat /dev/disk/by-uuid/3f6b0024-3a44-4fde-a43a-767b872abe5d
|
|
|
|
WARNING!
|
|
========
|
|
This will overwrite data on /dev/disk/by-uuid/3f6b0024-3a44-4fde-a43a-767b872abe5d irrevocably.
|
|
|
|
Are you sure? (Type uppercase yes): YES
|
|
Enter LUKS passphrase: ***
|
|
Verify passphrase: ***
|
|
|
|
# cryptsetup luksOpen /dev/disk/by-uuid/3f6b0024-3a44-4fde-a43a-767b872abe5d crypted
|
|
Enter passphrase for /dev/disk/by-uuid/3f6b0024-3a44-4fde-a43a-767b872abe5d: ***
|
|
|
|
# mkfs.ext4 /dev/mapper/crypted
|
|
```
|
|
|
|
The LUKS volume should be automatically picked up by
|
|
`nixos-generate-config`, but you might want to verify that your
|
|
`hardware-configuration.nix` looks correct. To manually ensure that the
|
|
system is automatically mounted at boot time as `/`, add the following
|
|
to `configuration.nix`:
|
|
|
|
```nix
|
|
boot.initrd.luks.devices.crypted.device = "/dev/disk/by-uuid/3f6b0024-3a44-4fde-a43a-767b872abe5d";
|
|
fileSystems."/".device = "/dev/mapper/crypted";
|
|
```
|
|
|
|
Should grub be used as bootloader, and `/boot` is located on an
|
|
encrypted partition, it is necessary to add the following grub option:
|
|
|
|
```nix
|
|
boot.loader.grub.enableCryptodisk = true;
|
|
```
|
|
|
|
## FIDO2 {#sec-luks-file-systems-fido2}
|
|
|
|
NixOS also supports unlocking your LUKS-Encrypted file system using a
|
|
FIDO2 compatible token. In the following example, we will create a new
|
|
FIDO2 credential and add it as a new key to our existing device
|
|
`/dev/sda2`:
|
|
|
|
```ShellSession
|
|
# export FIDO2_LABEL="/dev/sda2 @ $HOSTNAME"
|
|
# fido2luks credential "$FIDO2_LABEL"
|
|
f1d00200108b9d6e849a8b388da457688e3dd653b4e53770012d8f28e5d3b269865038c346802f36f3da7278b13ad6a3bb6a1452e24ebeeaa24ba40eef559b1b287d2a2f80b7
|
|
|
|
# fido2luks -i add-key /dev/sda2 f1d00200108b9d6e849a8b388da457688e3dd653b4e53770012d8f28e5d3b269865038c346802f36f3da7278b13ad6a3bb6a1452e24ebeeaa24ba40eef559b1b287d2a2f80b7
|
|
Password:
|
|
Password (again):
|
|
Old password:
|
|
Old password (again):
|
|
Added to key to device /dev/sda2, slot: 2
|
|
```
|
|
|
|
To ensure that this file system is decrypted using the FIDO2 compatible
|
|
key, add the following to `configuration.nix`:
|
|
|
|
```nix
|
|
boot.initrd.luks.fido2Support = true;
|
|
boot.initrd.luks.devices."/dev/sda2".fido2.credential = "f1d00200108b9d6e849a8b388da457688e3dd653b4e53770012d8f28e5d3b269865038c346802f36f3da7278b13ad6a3bb6a1452e24ebeeaa24ba40eef559b1b287d2a2f80b7";
|
|
```
|
|
|
|
You can also use the FIDO2 passwordless setup, but for security reasons,
|
|
you might want to enable it only when your device is PIN protected, such
|
|
as [Trezor](https://trezor.io/).
|
|
|
|
```nix
|
|
boot.initrd.luks.devices."/dev/sda2".fido2.passwordLess = true;
|
|
```
|