[Bug 1748983] Re: Generate per-machine MOK for dkms signing

[Lurchman]

This seems to be causing a regression with the bcmwl driver, see
https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1818134 for further
details.

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https://bugs.launchpad.net/bugs/1748983

Title:
  Generate per-machine MOK for dkms signing

Status in dkms package in Ubuntu:
  Fix Released
Status in shim-signed package in Ubuntu:
  Fix Released
Status in dkms source package in Trusty:
  Fix Released
Status in shim-signed source package in Trusty:
  Fix Released
Status in dkms source package in Xenial:
  Fix Released
Status in shim-signed source package in Xenial:
  Fix Released

Bug description:
  [SRU Justification]
  Move to using self-signed keys for signing DKMS modules, along with the wizard / guide to make this work properly, to let third-party modules be signed and loaded by enforcing kernels, rather than disabling Secure Boot altogether.

  [Test case]
  1) Install Ubuntu in UEFI mode.
  2) Install bbswitch-dkms (or another -dkms package if useful on your system).
  3) Follow the steps in the debconf prompts (enter a password, remember the password for next boot).
  4) Reboot; follow the steps in MokManagerL
  4a) Pick Enroll MOK: add the new key, enter the password when prompted to do so.
  4b) If a dkms package was previously installed on the system (so Secure Boot is currently disabled in shim), pick "Change Secure Boot state". Follow the prompts to enter password characters. The option will only show up if Secure Boot validation was found to be disabled.
  5) Pick "Reboot".
  6) Log in and verify that the dkms module is loaded, using "lsmod | grep <module>".
  7) Run 'modprobe <module>' to validate that the module can be loaded explicilty.
  8) Validate that there are no errors from modprobe or errors in dmesg concerning signing keys.

  [Regression potential]
  If anything currently relies on Secure Boot validation being disabled in order to correctly run with an enforcing kernel, or grub is used in enforcing mode, custom / third-party kernels and modules may fail to load.

  ---

  shim-signed's update-secureboot-policy should allow creating a
  machine-owner key, and using this for signing kernel modules built via
  DKMS. Key generation and enrolling should be made as easy as possible
  for users.

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