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

[Julian Andres Klode]

The problem seems to be caused by having two shims, as we get the
"Bootloader has not verified loaded image" messages when loading this
way, but if we instead chainload the local grub directly, things work.

So it seems like local shim does not correctly uninstall and replace
remote shim protocol or something like that.

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

Status in MAAS:
  Confirmed
Status in grub2 package in Ubuntu:
  Triaged
Status in shim-signed package in Ubuntu:
  Triaged
Status in grub2 source package in Focal:
  New
Status in shim-signed source package in Focal:
  New
Status in grub2 source package in Groovy:
  Triaged
Status in shim-signed source package in Groovy:
  Triaged

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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