85 lines
3.6 KiB
XML
85 lines
3.6 KiB
XML
|
<section xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-luks-file-systems">
|
||
|
|
<title>LUKS-Encrypted File Systems</title>
|
||
|
|
<para>
|
||
|
|
NixOS supports file systems that are encrypted using
|
||
|
|
<emphasis>LUKS</emphasis> (Linux Unified Key Setup). For example,
|
||
|
|
here is how you create an encrypted Ext4 file system on the device
|
||
|
|
<literal>/dev/disk/by-uuid/3f6b0024-3a44-4fde-a43a-767b872abe5d</literal>:
|
||
|
|
</para>
|
||
|
|
<programlisting>
|
||
|
|
# 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
|
||
|
|
</programlisting>
|
||
|
|
<para>
|
||
|
|
The LUKS volume should be automatically picked up by
|
||
|
|
<literal>nixos-generate-config</literal>, but you might want to
|
||
|
|
verify that your <literal>hardware-configuration.nix</literal> looks
|
||
|
|
correct. To manually ensure that the system is automatically mounted
|
||
|
|
at boot time as <literal>/</literal>, add the following to
|
||
|
|
<literal>configuration.nix</literal>:
|
||
|
|
</para>
|
||
|
|
<programlisting language="bash">
|
||
|
|
boot.initrd.luks.devices.crypted.device = "/dev/disk/by-uuid/3f6b0024-3a44-4fde-a43a-767b872abe5d";
|
||
|
|
fileSystems."/".device = "/dev/mapper/crypted";
|
||
|
|
</programlisting>
|
||
|
|
<para>
|
||
|
|
Should grub be used as bootloader, and <literal>/boot</literal> is
|
||
|
|
located on an encrypted partition, it is necessary to add the
|
||
|
|
following grub option:
|
||
|
|
</para>
|
||
|
|
<programlisting language="bash">
|
||
|
|
boot.loader.grub.enableCryptodisk = true;
|
||
|
|
</programlisting>
|
||
|
|
<section xml:id="sec-luks-file-systems-fido2">
|
||
|
|
<title>FIDO2</title>
|
||
|
|
<para>
|
||
|
|
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 <literal>/dev/sda2</literal>:
|
||
|
|
</para>
|
||
|
|
<programlisting>
|
||
|
|
# 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
|
||
|
|
</programlisting>
|
||
|
|
<para>
|
||
|
|
To ensure that this file system is decrypted using the FIDO2
|
||
|
|
compatible key, add the following to
|
||
|
|
<literal>configuration.nix</literal>:
|
||
|
|
</para>
|
||
|
|
<programlisting language="bash">
|
||
|
|
boot.initrd.luks.fido2Support = true;
|
||
|
|
boot.initrd.luks.devices."/dev/sda2".fido2.credential = "f1d00200108b9d6e849a8b388da457688e3dd653b4e53770012d8f28e5d3b269865038c346802f36f3da7278b13ad6a3bb6a1452e24ebeeaa24ba40eef559b1b287d2a2f80b7";
|
||
|
|
</programlisting>
|
||
|
|
<para>
|
||
|
|
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
|
||
|
|
<link xlink:href="https://trezor.io/">Trezor</link>.
|
||
|
|
</para>
|
||
|
|
<programlisting language="bash">
|
||
|
|
boot.initrd.luks.devices."/dev/sda2".fido2.passwordLess = true;
|
||
|
|
</programlisting>
|
||
|
|
</section>
|
||
|
|
</section>
|