[Bug 1857398] Re: ubiquity should support encryption by default with zfsroot, with users able to opt in to running change-key after install

[Jean-Baptiste Lallement]

I agree with Richard and we had the same discussion yesterday with Didier.
We should expose zfs encryption in Ubiquity and align is on LVM. This would leave the decision to the user to use or not ZFS encryption and not force him to use it if he selects ZFS.

Secondly, we don't have any sort of feedback and the measure of the
impact of zfs encryption on our users is very limited.

It seems to me very risky to enable it by default without any way to
disable it, especially for an LTS and on a desktop where users are not
necessarily familiar with the CLI.

@Steve could you add a section with your vision of ZFS encryption to the
"ZFS on root" specification so we can discuss and refine the approach
there?

Thanks.

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https://bugs.launchpad.net/bugs/1857398

Title:
  ubiquity should support encryption by default with zfsroot, with users
  able to opt in to running change-key after install

Status in ubiquity package in Ubuntu:
  New
Status in zfs-linux package in Ubuntu:
  New

Bug description:
  zfs supports built-in encryption support, but the decision of whether
  a pool is encrypted or not must be made at pool creation time; it is
  possible to add encrypted datasets on top of an unencrypted pool but
  it is not possible to do an online change of a dataset (or a whole
  pool) to toggle encryption.

  We should therefore always install with encryption enabled on zfs
  systems, with a non-secret key by default, and allow the user to use
  'zfs change-key -o keylocation=prompt' after install to take ownership
  of the encryption and upgrade the security.

  This is also the simplest way to allow users to avoid having to choose
  between the security of full-disk encryption, and the advanced
  filesystem features of zfs since it requires no additional UX work in
  ubiquity.

  We should make sure that
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1857040 is fixed
  first in the kernel so that enabling zfs encryption does not impose an
  unreasonable performance penalty.

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