[Bug 1865515] Re: Chainbooting from grub over the network to local shim breaks chain of trust

[Dimitri John Ledkov]

There is no other way to deploy with secureboot, without modifying the
deployed OS shim.

Thus either we fix above two bugs as well, or those targets will not
have secureboot and continue to use chainloading.

Requirements for secureboot are:
* create valid uefi boot entries
* do not delete them
* use exit 1 to boot local disk

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https://bugs.launchpad.net/bugs/1865515

Title:
  Chainbooting from grub over the network to local shim breaks chain of
  trust

Status in MAAS:
  Triaged
Status in OEM Priority Project:
  Confirmed
Status in shim:
  New
Status in grub2 package in Ubuntu:
  Fix Released
Status in shim-signed package in Ubuntu:
  Invalid
Status in grub2 source package in Focal:
  Triaged
Status in shim-signed source package in Focal:
  Invalid
Status in grub2 source package in Groovy:
  Triaged
Status in shim-signed source package in Groovy:
  Invalid

Bug description:
  MAAS (2.4.2 and 2.6.2) cannot deploy to a server with Secure Boot
  active. This appears to be a regression of bug #1711203; the symptoms
  are identical. Namely:

  1) The system can begin deployment fine.
  2) After deployment is complete except for the final reboot, the
     system will reboot.
  3) GRUB appears briefly on the screen.
  4) The system console briefly displays the message:
     Bootloader has not verified loaded image
     System is compromised.  halting.
  5) The node powers off.
  6) Eventually MAAS times out on the deployment and declares
     that it's failed.

  I've verified this on three MAAS servers and one node each (jehan, a
  Quanta QuantaGrid D52B-1U in 18T; capella, a Supermicro SYS-6028U-TR4+
  in 1SS, and brennan, an Intel NUC DC53427HYE on my home network).

  Two of the MAAS servers are running MAAS
  2.6.2-7841-ga10625be3-0ubuntu1~18.04.1; the third is on
  2.4.2-7034-g2f5deb8b8-0ubuntu1.

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