[Bug 1797011] Re: [FFE] Update mokutil to fb6250f2

[Mathieu Trudel-Lapierre]

THe principal feature we need here is --export; which will allow us to
export keys from the firmware and compare kernel signatures to figure
out whether kernels are signed with trusted keys, which will improve the
experience on upgrades from previous releases. This is especially
relevant in the event someone installs a package from the kernel PPA and
re-signs it (or imports the certificate) to keep Secure Boot validation
enabled.

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Title:
  [FFE] Update mokutil to fb6250f2

Status in mokutil package in Ubuntu:
  New

Bug description:
  [Impact]
  All Ubuntu users on UEFI systems

  [Test case]

  == Disabling timeout ==
  1) Run 'sudo mokutil --timeout -1'.
  2) Run 'sudo mokutil --reset' (or another command that requires user interaction in MokManager)
  2) On reboot, validate that MokManager does not show a timeout screen, and instead immediately stops at the menu.

  == Changing timeout ==
  1) Run 'sudo mokutil --timeout 666'.
  2) Run 'sudo mokutil --reset' (or another command that requires user interaction in MokManager)
  2) On reboot, validate that MokManager shows a timer of 666 seconds before continuing to reboot, waiting for user input.

  == Exporting keys ==
  1) Run 'sudo mokutil --export --db'; 'sudo mokutil --export --kek', etc.
  2) Validate that mokutil allows exporting the contents of DB, KEK, etc.

  [Regression potential]
  This affects the userland tool used to communicate tasks to have done by MokManager at early boot. As such, any failure to enroll certificates, to disable validation in shim, to export keys or list keys should be investigated as possible regressions caused by this update.

  ---

  Update mokutil to a git snapshot of fb6250f2.

  Changes since cca7219 (current git snapshot in cosmic):

  fb6250f Update TODO
  af2387a Rename export_moks as export_db_keys
  4efbb0e Add support for exporting other keys
  f0217e5 add new --mok argument
  73c045b set list-enrolled command as default for some arguments
  382ba20 Add more info to --sb-state: show when we're in SetupMode or with shim validation disabled
  303ee33 Correct help: --set-timeout is really --timeout
  385a7dd generate_hash() / generate_pw_hash(): don't use strlen() for strncpy bounds
  c8b26c2 Add the type casting to silence the warning

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