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[Scott Moser <smoser@xxxxxxxxxx>]

this bug has now been copied over to maas-import-squashfs

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https://bugs.launchpad.net/bugs/1039513

Title:
  maas-import-pxe-files doesn't cryptographically verify what it
  downloads

Status in MAAS:
  Triaged

Bug description:
  Currently, maas-import-pxe-files uses HTTP to download its files,
  including pxelinux.0 and netboot kernel image and initrd. In theory,
  somebody could intercept this and inject a malicious payload.

  maas-import-ephemerals avoids this by using HTTPS, but:
    1) This prevents (easy) caching
    2) archive.ubuntu.com doesn't appear to support HTTPS
    3) The files we need are indirectly signed, so if we just try to verify what is there we'll end up with the same race condition that apt faces in bug 972077

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