Root on ZFS with native encryption: Difference between revisions

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This guide aims to setup encrypted Alpine Linux on ZFS with a layout compatible with boot environments. Mirror and RAID-Z supported.
This is a guide for installing Alpine Linux with its root partition on an encrypted ZFS volume, using ZFS's own encryption capabilities. The system will be encrypted when powered off and will need to be unlocked by typing a passphrase at boot. To be able to boot the system, the `/boot` partition remains unencrypted.


Except EFI system partition and boot pool <code>/boot</code>, everything is encrypted. Root pool is encrypted with ZFS native encryption and swap partition is encrypted with dm-crypt.
= OpenZFS Guide =


To do an unencrypted setup, simply omit <code>-O keylocation -O keyformat</code> when creating root pool.
A guide on OpenZFS website supports native encryption, UEFI boot and legacy boot, and multi-disk.  See [https://openzfs.github.io/openzfs-docs/Getting%20Started/Alpine%20Linux/Root%20on%20ZFS.html here].


= Notes =
= Downloading Alpine =


UEFI is required. Supports single disk & multi-disk (stripe, mirror, RAID-Z) installation.
Download the '''extended''' release from https://www.alpinelinux.org/downloads/ as only it contains the zfs kernel modules at the time of writing (2022-02-12).


'''Existing data on target disk(s) will be destroyed.'''
Write it to a USB device and boot from it.


= Preparation =
= Initial Setup =


== Setup live environment ==
Run the following to start the installation procedure:


Download the '''''extended''''' release from https://www.alpinelinux.org/downloads/, as only this version is shipped with ZFS kernel module. Alpine Linux can not load kernel module in live.
{{cmd|setup-alpine}}


Run the following command to setup the live environment, use default <code>none</code> option when asked about disks.
Answer all the questions, and hit {{Key|Ctrl}}+{{Key|C}} when prompted for which disk you'd like to use.


<pre>setup-alpine</pre>
== Optional: SSH access ==
Settings given here will be copied to the target system later by <code>setup-disk</code>.


== Install system utilities ==
This section is optional and it assumes internet connectivity. You may enable sshd so you can ssh into the box and copy and paste the rest of the commands from these instructions into a terminal window.


Install and setup<code>eudev</code> (a port of systemd <code>udev</code> by gentoo) to get block device names.
Edit {{path|/etc/ssh/sshd_config}} and search for `Permit`. Change the value after `PermitRootLogin` to read `yes`


<pre>apk update
save and exit to shell. Run {{codeline|service sshd restart}}
apk add eudev sgdisk grub-efi zfs
modprobe zfs
setup-udev</pre>
= Variables =


In this step, we will set some variables to make our installation process easier.
Now you can ssh in as root. Do not forget to go back and comment this line out when you're done since it will be enabled on the resulting machine. You will be reminded again at the end of this doc.


<pre>DISK=/dev/disk/by-id/ata-HXY_120G_YS</pre>
= Add required packages  =
Use unique disk path instead of <code>/dev/sda</code> to ensure the correct partition can be found by ZFS.


Other variables
{{cmd|apk add {{pkg|zfs}} {{pkg|sfdisk}} {{pkg|e2fsprogs}} {{pkg|syslinux}}}}


<pre>TARGET_USERNAME='your username'
= Partition setup =
ENCRYPTION_PWD='your root pool encryption password, 8 characters min'
TARGET_USERPWD='user account password'</pre>
Create a mountpoint


<pre>MOUNTPOINT=`mktemp -d`</pre>
We're assuming that {{path|/dev/sda}} is the target storage device here and in the rest of the document, but the name of the storage device you wish to install to may be different. To see a list of storage devices and determine the correct one, type {{codeline|sfdisk -l}}.
Create a unique suffix for the ZFS pools: this will prevent name conflict when importing pools on another Root on ZFS system.


<pre>poolUUID=$(dd if=/dev/urandom of=/dev/stdout bs=1 count=100 2>/dev/null |tr -dc 'a-z0-9' | cut -c-6)</pre>
{{cmd|echo -e "/dev/sda1: start{{=}}1M,size{{=}}100M,bootable\n/dev/sda2: start{{=}}101M" &#124; sfdisk --quiet --label dos /dev/sda}}
= Partitioning =


For a single disk, UEFI installation, we need to create at lease 3 partitions: - EFI system partition - Boot pool partition - Root pool partition Since GRUB only partially support ZFS, many features needs to be disabled on the boot pool. By creating a separate root pool, we can then utilize the full potential of ZFS.
== Create device nodes ==


Clear the partition table on the target disk and create EFI, boot and root pool parititions:
{{cmd|mdev -s}}


<pre>sgdisk --zap-all $DISK
== Create the {{path|/boot}} filesystem ==
sgdisk -n1:0:+512M -t1:EF00 $DISK
sgdisk -n2:0:+2G $DISK        # boot pool
sgdisk -n3:0:0 $DISK          # root pool</pre>
If you want to use a multi-disk setup, such as mirror or RAID-Z, partition every target disk with the same commands above.


== Optional: Swap partition ==
{{cmd|mkfs.ext4 /dev/sda1}}


<code>Swap</code> support on ZFS is also problematic, therefore it is recommended to create a separate Swap partition if needed. This guide will cover the creation of a separate swap partition.(can not be used for hibernation since the encryption key is discarded when power off.)
= ZFS setup =
== Create the root zpool ==


If you want to use swap, reserve some space at the end of disk when creating root pool:
{{cmd|modprobe zfs
zpool create -f -o ashift{{=}}12 \
-O acltype{{=}}posixacl -O canmount{{=}}off -O compression{{=}}lz4 \
-O dnodesize{{=}}auto -O normalization{{=}}formD -O relatime{{=}}on -O xattr{{=}}sa \
-O encryption{{=}}aes-256-gcm -O keylocation{{=}}prompt -O keyformat{{=}}passphrase \
-O mountpoint{{=}}/ -R /mnt \
rpool /dev/sda2}}


<pre>sgdisk -n3:0:-8G $DISK        # root pool, reserve 8GB for swap at the end of the disk
You will have to enter your passphrase at this point. Choose wisely, as your passphrase is most likely [https://gitlab.com/cryptsetup/cryptsetup/wikis/FrequentlyAskedQuestions#5-security-aspects the weakest link in this setup].
sgdisk -n4:0:0 $DISK          # swap partition</pre>
= Create boot and root pool =


As mentioned above, ZFS features need to be selectively enabled for GRUB. All available features are enabled when no <code>feature@</code> is supplied.
A few notes on the options supplied to zpool:
<ul>
<li>{{codeline|ashift{{=}}12}} is recommended here because many drives today have 4KiB (or larger) physical sectors, even though they present 512B logical sectors</li>
<li>{{codeline|acltype{{=}}posixacl}} enables POSIX ACLs globally</li>
<li>{{codeline|normalization{{=}}formD}} eliminates some corner cases relating to UTF-8 filename normalization. It also enables `utf8only=on`, meaning that only files with valid UTF-8 filenames will be accepted.</li>
<li>{{codeline|xattr{{=}}sa}} vastly improves the performance of extended attributes, but is Linux-only. If you care about using this pool on other OpenZFS implementation don't specify this option.</li></ul>


Here we explicitly enable those GRUB can support.
After completing this, confirm that the pool has been created:


<pre>zpool create \
{{cmd|# zpool status}}
  -o ashift=12 -d \
  -o feature@async_destroy=enabled \
  -o feature@bookmarks=enabled \
  -o feature@embedded_data=enabled \
  -o feature@empty_bpobj=enabled \
  -o feature@enabled_txg=enabled \
  -o feature@extensible_dataset=enabled \
  -o feature@filesystem_limits=enabled \
  -o feature@hole_birth=enabled \
  -o feature@large_blocks=enabled \
  -o feature@lz4_compress=enabled \
  -o feature@spacemap_histogram=enabled \
  -O acltype=posixacl -O canmount=off -O compression=lz4 \
  -O devices=off -O normalization=formD -O relatime=on -O xattr=sa \
  -O mountpoint=/boot -R $MOUNTPOINT \
  bpool_$poolUUID $DISK-part2</pre>
Nothing is stored directly under bpool and rpool, hence <code>canmount=off</code>. The respective <code>mountpoint</code> properties are more symbolic than practical.


For root pool all available features are enabled by default
Should return something like:


<pre>echo $ENCRYPTION_PWD | zpool create \
      pool: rpool
  -o ashift=12 \
    state: ONLINE
  -O encryption=aes-256-gcm \
      scan: none requested
  -O keylocation=prompt -O keyformat=passphrase \
    config:
  -O acltype=posixacl -O canmount=off -O compression=lz4 \
   
  -O dnodesize=auto -O normalization=formD -O relatime=on \
        NAME        STATE    READ WRITE CKSUM
  -O xattr=sa -O mountpoint=/ -R $MOUNTPOINT \
        rpool      ONLINE      0    0    0
  rpool_$poolUUID $DISK-part3</pre>
          sda2      ONLINE      0    0    0
== For multi-disk ==
   
    errors: No known data errors


For mirror:
== Create the required datasets and mount root ==


<pre>zpool create \
{{cmd|zfs create -o mountpoint{{=}}none -o canmount{{=}}off rpool/ROOT
  ... \
zfs create -o mountpoint{{=}}legacy rpool/ROOT/alpine
  bpool_$poolUUID mirror \
mount -t zfs rpool/ROOT/alpine /mnt/}}
  /dev/disk/by-id/target_disk1-part2 \
  /dev/disk/by-id/target_disk2-part2
zpool create \
  ... \
  rpool_$poolUUID mirror \
  /dev/disk/by-id/target_disk1-part3 \
  /dev/disk/by-id/target_disk2-part3</pre>
For RAID-Z, replace mirror with raidz, raidz2 or raidz3.


= Create system datasets =
== Mount the {{path|/boot}} filesystem ==


This layout is intended to separate root file system from persistent files. See https://wiki.archlinux.org/index.php/User:M0p/Root_on_ZFS_Native_Encryption/Layout for a description.
{{cmd|mkdir /mnt/boot/
mount -t ext4 /dev/sda1 /mnt/boot/}}


<pre>zfs create -o canmount=off -o mountpoint=none rpool_$poolUUID/HOME
== Enable ZFS' services ==
zfs create -o canmount=off -o mountpoint=none rpool_$poolUUID/ROOT
zfs create -o canmount=off -o mountpoint=none bpool_$poolUUID/BOOT
zfs create -o mountpoint=/ -o canmount=noauto rpool_$poolUUID/ROOT/default
zfs create -o mountpoint=/boot -o canmount=noauto bpool_$poolUUID/BOOT/default
zfs mount rpool_$poolUUID/ROOT/default
zfs mount bpool_$poolUUID/BOOT/default
# ash, default with busybox, does not support array
# this is word splitting
d='usr var var/lib'
for i in $d; do zfs create  -o canmount=off rpool_$poolUUID/ROOT/default/$i; done
d='srv usr/local'
for i in $d; do zfs create rpool_$poolUUID/ROOT/default/$i; done
d='log spool tmp'
for i in $d; do zfs create rpool_$poolUUID/ROOT/default/var/$i; done
zfs create -o mountpoint=/home rpool_$poolUUID/HOME/default
zfs create -o mountpoint=/root rpool_$poolUUID/HOME/default/root
zfs create rpool_$poolUUID/HOME/default/$TARGET_USERNAME</pre>
Depending on your application, separate datasets need to be created for folders inside <code>/var/lib</code>(not itself!)


Here we create several folders for persistent (shared) data, like we just did for <code>/home</code>.
{{cmd|rc-update add zfs-import sysinit
rc-update add zfs-mount sysinit}}


<pre>d='libvirt lxc docker'
= Install Alpine Linux =
for i in $d; do zfs create rpool_$poolUUID/ROOT/default/var/lib/$i; done</pre>
<code>lxc</code> is for Linux container, <code>libvirt</code> is for storing virtual machine images, etc.


= Format and mount EFI partition =
{{cmd|setup-disk /mnt
dd if{{=}}/usr/share/syslinux/mbr.bin of{{=}}/dev/sda # write mbr so we can boot}}


Here we use <code>/boot/efi</code> as the mountpoint, which is default for GRUB.
= Reboot and enjoy! =


<pre>mkfs.vfat -n EFI $DISK-part1
😉
mkdir $MOUNTPOINT/boot/efi
mount -t vfat $DISK-part1 $MOUNTPOINT/boot/efi # need to specify file system</pre>
= System installation =


== Preparation ==
'''NOTE:'''
 
If you went with the optional step, be sure to disable root login after you reboot.
GRUB will not find the correct path of root device without ZPOOL_VDEV_NAME_PATH=1.
 
<pre>export ZPOOL_VDEV_NAME_PATH=1</pre>
<code>setup-disk</code> refuse to run on ZFS by default, we need to add ZFS to the supported filesystem array.
 
<pre>sed -i 's|supported="ext|supported="zfs ext|g' /sbin/setup-disk</pre>
== setup-disk ==
 
Run <code>setup-disk</code> to install system to target disk.
 
<pre>BOOTLOADER=grub USE_EFI=y setup-disk -v $MOUNTPOINT</pre>
Note that grub-probe will still fail despite <code>ZPOOL_VDEV_NAME_PATH=YES</code> variable set above. We will deal with this later inside chroot.
 
== Chroot ==
 
<pre>m='dev proc sys'
for i in $m; do mount --rbind /$i $MOUNTPOINT/$i; done
chroot $MOUNTPOINT /usr/bin/env TARGET_USERPWD=$TARGET_USERPWD TARGET_USERNAME=$TARGET_USERNAME poolUUID=$poolUUID /bin/sh</pre>
=== Finish GRUB installation ===
 
As GRUB installation failed half-way in [[#Run setup-disk]], we will finish it here.
 
Apply fix:
 
<pre>echo 'export ZPOOL_VDEV_NAME_PATH=YES' >> /etc/profile</pre>
Reload
 
<pre>source /etc/profile</pre>
==== GRUB fails to detect the ZFS filesystem of /boot with BusyBox stat ====
 
<pre>apk add coreutils</pre>
==== Missing root pool ====
 
GRUB will fail to detect rpool if rpool has unsupported features, use the following workaround:
 
<pre>sed -i "s|rpool=.*|rpool=\`zdb -l \${GRUB_DEVICE} \| grep -E '[[:blank:]]name' \| cut -d\\\' -f 2\`|"  /etc/grub.d/10_linux</pre>
This replaces GRUB rpool name detection.
 
==== Generate grub.cfg ====
 
After applying fixes, finally run
 
<pre>grub-mkconfig -o /boot/grub/grub.cfg</pre>
=== Importing pools on boot ===
 
<code>zpool.cache</code> will be added to initramfs and zpool command will import pools contained in this cache.
 
System will fail to boot without this.
 
<pre>zpool set cachefile=/etc/zfs/zpool.cache rpool_$poolUUID
zpool set cachefile=/etc/zfs/zpool.cache bpool_$poolUUID</pre>
=== Initramfs ===
 
<code>mkinitfs</code> included in stable Alpine Linux has bugs, before [https://gitlab.alpinelinux.org/alpine/mkinitfs/-/merge_requests/77 1] and [https://gitlab.alpinelinux.org/alpine/mkinitfs/-/merge_requests/76 2] is merged, we need to patch it manually. #### Patch Ensure <code>mkinitfs</code> version is the following
 
<pre>foolive:/# apk info mkinitfs
mkinitfs-3.4.5-r3 description:</pre>
Then download [https://g.nu8.org/posts/bieaz/setup/alpine/guide/patch/eudev-zfs-mkinitfs-3.4.5.patch|eudev-zfs-mkinitfs-3.4.5.patch], install <code>patch</code> and patch it.
 
<pre>foolive:~# wget https://g.nu8.org/path-to-patch
foolive:~# apk add patch
foolive:~# cd / # must apply patch at root
foolive:/# patch -Np1 -i /root/eudev-zfs-mkinitfs-3.4.5.patch
patching file etc/mkinitfs/features.d/eudev.files
patching file etc/mkinitfs/features.d/zfs.files
patching file usr/share/mkinitfs/initramfs-init</pre>
==== Add eudev hook and rebuild ====
 
Add <code>eudev</code> to <code>/etc/mkinitfs/mkinitfs.conf</code>.
 
<pre>echo 'features="ata base eudev ide scsi usb virtio nvme zfs"' > /etc/mkinitfs/mkinitfs.conf
# order of features is important! this order is tested</pre>
Rebuild initramfs with
 
<pre>mkinitfs $(ls -1 /lib/modules/)</pre>
 
=== Mount datasets at boot ===
 
<pre>rc-update add zfs-mount sysinit</pre>
Mounting <code>/boot</code> dataset with fstab need <code>mountpoint=legacy</code>:
 
<pre>umount /boot/efi
zfs set mountpoint=legacy bpool_$poolUUID/BOOT/default
mount /boot
mount /boot/efi</pre>
=== Add user ===
 
<pre>adduser -s /bin/sh -H -D -h /home/$TARGET_USERNAME $TARGET_USERNAME
chown -R $TARGET_USERNAME /home/$TARGET_USERNAME
echo "$TARGET_USERNAME:$TARGET_USERPWD" | chpasswd</pre>
Root account is accessed via <code>su</code> command with root password.
 
=== Boot environment manager ===
 
[https://gitlab.com/m_zhou/bieaz bieaz] is a simple boot environment management shell script with GRUB integration.
 
It has been submitted to aports, see [https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/16406 this merge request]. Should be available in edge/test soon.
 
=== Optional: Enable encrypted swap partition ===
 
Install <code>cryptsetup</code>
 
<pre>apk add cryptsetup</pre>
Edit the <code>/etc/mkinitfs/mkinitfs.conf</code> file and append the <code>cryptsetup</code> module to the front of zfs. Add relevant lines in <code>fstab</code> and <code>crypttab</code>. Replace <code>$DISK</code> with actual disk.
 
<pre>echo swap  $DISK-part4 /dev/urandom    swap,cipher=aes-cbc-essiv:sha256,size=256 >> /etc/crypttab
echo /dev/mapper/swap  none    swap    defaults    0  0 >> /etc/fstab</pre>
Rebuild initramfs with <code>mkinitfs</code>.
 
= Finish installation =
 
Take a snapshot for the clean installation for future use and export all pools.
 
<pre>exit
zfs snapshot -r rpool_$poolUUID/ROOT/default@install
zfs snapshot -r bpool_$poolUUID/BOOT/default@install</pre>
Pools must be exported before reboot, or they will fail to be imported on boot.
 
<pre>mount | grep -v zfs | tac | grep $MOUNTPOINT | awk '{print $3}' | \
xargs -i{} umount -lf {}
zpool export bpool_$poolUUID
zpool export rpool_$poolUUID</pre>
= Reboot =
 
<pre>reboot</pre>
= Recovery in Live environment =
 
Boot Live environment (extended release) and repeat [[#preparation|Preparation]]
 
Create a mount point and store encryption password in a variable:
 
<pre>MOUNTPOINT=`mktemp -d`
ENCRYPTION_PWD='YOUR DISK ENCRYPTION PASSWORD, 8 MINIMUM'</pre>
Find the unique UUID of your pool with
 
<pre>zpool import</pre>
Import rpool without mounting datasets: <code>-N</code> for not mounting all datasets; <code>-R</code> for alternate root.
 
<pre>poolUUID=abc123
zpool import -N -R $MOUNTPOINT rpool_$poolUUID</pre>
Load encryption key
 
<pre>echo $ENCRYPTION_PWD | zfs load-key -a</pre>
As <code>canmount=noauto</code> is set for <code>/</code> dataset, we have to mount it manually. To find the dataset, use
 
<pre>zfs list rpool_$poolUUID/ROOT</pre>
Mount <code>/</code> dataset
 
<pre>zfs mount rpool_$UUID/ROOT/$dataset</pre>
Mount other datasets
 
<pre>zfs mount -a</pre>
Import bpool
 
<pre>zpool import -N -R $MOUNTPOINT bpool_$UUID</pre>
Find and mount the <code>/boot</code> dataset, same as above.
 
<pre>zfs list bpool_$UUID/BOOT
mount -t zfs bpool_$UUID/BOOT/$dataset $MOUNTPOINT/boot # legacy mountpoint</pre>
Chroot
 
<pre>mount --rbind /dev  $MOUNTPOINT/dev
mount --rbind /proc $MOUNTPOINT/proc
mount --rbind /sys  $MOUNTPOINT/sys
chroot $MOUNTPOINT /bin/sh</pre>
After chroot, mount <code>/efi</code>
 
<pre>mount /boot/efi</pre>
After fixing the system, don't forget to umount and export the pools:
 
<pre>mount | grep -v zfs | tac | grep $MOUNTPOINT | awk '{print $3}' | \
xargs -i{} umount -lf {}
zpool export bpool_$poolUUID
zpool export rpool_$poolUUID</pre>

Latest revision as of 17:18, 21 August 2023

This is a guide for installing Alpine Linux with its root partition on an encrypted ZFS volume, using ZFS's own encryption capabilities. The system will be encrypted when powered off and will need to be unlocked by typing a passphrase at boot. To be able to boot the system, the `/boot` partition remains unencrypted.

OpenZFS Guide

A guide on OpenZFS website supports native encryption, UEFI boot and legacy boot, and multi-disk. See here.

Downloading Alpine

Download the extended release from https://www.alpinelinux.org/downloads/ as only it contains the zfs kernel modules at the time of writing (2022-02-12).

Write it to a USB device and boot from it.

Initial Setup

Run the following to start the installation procedure:

setup-alpine

Answer all the questions, and hit Ctrl+C when prompted for which disk you'd like to use.

Optional: SSH access

This section is optional and it assumes internet connectivity. You may enable sshd so you can ssh into the box and copy and paste the rest of the commands from these instructions into a terminal window.

Edit /etc/ssh/sshd_config and search for `Permit`. Change the value after `PermitRootLogin` to read `yes`

save and exit to shell. Run service sshd restart

Now you can ssh in as root. Do not forget to go back and comment this line out when you're done since it will be enabled on the resulting machine. You will be reminded again at the end of this doc.

Add required packages

apk add zfs sfdisk e2fsprogs syslinux

Partition setup

We're assuming that /dev/sda is the target storage device here and in the rest of the document, but the name of the storage device you wish to install to may be different. To see a list of storage devices and determine the correct one, type sfdisk -l.

echo -e "/dev/sda1: start=1M,size=100M,bootable\n/dev/sda2: start=101M" | sfdisk --quiet --label dos /dev/sda

Create device nodes

mdev -s

Create the /boot filesystem

mkfs.ext4 /dev/sda1

ZFS setup

Create the root zpool

modprobe zfs zpool create -f -o ashift=12 \ -O acltype=posixacl -O canmount=off -O compression=lz4 \ -O dnodesize=auto -O normalization=formD -O relatime=on -O xattr=sa \ -O encryption=aes-256-gcm -O keylocation=prompt -O keyformat=passphrase \ -O mountpoint=/ -R /mnt \ rpool /dev/sda2

You will have to enter your passphrase at this point. Choose wisely, as your passphrase is most likely the weakest link in this setup.

A few notes on the options supplied to zpool:

  • ashift=12 is recommended here because many drives today have 4KiB (or larger) physical sectors, even though they present 512B logical sectors
  • acltype=posixacl enables POSIX ACLs globally
  • normalization=formD eliminates some corner cases relating to UTF-8 filename normalization. It also enables `utf8only=on`, meaning that only files with valid UTF-8 filenames will be accepted.
  • xattr=sa vastly improves the performance of extended attributes, but is Linux-only. If you care about using this pool on other OpenZFS implementation don't specify this option.

After completing this, confirm that the pool has been created:

# zpool status

Should return something like: 

     pool: rpool
    state: ONLINE
     scan: none requested
   config:
   
       NAME        STATE     READ WRITE CKSUM
       rpool       ONLINE       0     0     0
         sda2      ONLINE       0     0     0
   
   errors: No known data errors

Create the required datasets and mount root

zfs create -o mountpoint=none -o canmount=off rpool/ROOT zfs create -o mountpoint=legacy rpool/ROOT/alpine mount -t zfs rpool/ROOT/alpine /mnt/

Mount the /boot filesystem

mkdir /mnt/boot/ mount -t ext4 /dev/sda1 /mnt/boot/

Enable ZFS' services

rc-update add zfs-import sysinit rc-update add zfs-mount sysinit

Install Alpine Linux

setup-disk /mnt dd if=/usr/share/syslinux/mbr.bin of=/dev/sda # write mbr so we can boot

Reboot and enjoy!

😉

NOTE: If you went with the optional step, be sure to disable root login after you reboot.

Retrieved from "https://wiki.alpinelinux.org/w/index.php?title=Root_on_ZFS_with_native_encryption&oldid=24380"