launchpad-reviewers team mailing list archive

[Scott Moser <smoser@xxxxxxxxxx>]

fwiw, this is a regression over the use of 'cobbler-ubuntu-import',
which does do gpg checking against /usr/share/keyrings/ubuntu-archive-
keyring.gpg [1].  That was added under bug 974460.

Outside of the race condition, which I'm willing to ignore for the time
being, we can just use the same solution there.

Note also that a "InRelease" (signed content in same file as payload)
does not fix this entirely either, as there is still the race between
downloading the ISO and the the signed file.

--
[1] http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/quantal/cobbler/quantal/view/head:/debian/cobbler-ubuntu-import#L86

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

Title:
  maas-import-pxe-files should cryptographically verify what it
  downloads

Status in MAAS:
  New

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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