[Bug 1647285] Re: SSL trust not system-wide

[dwmw2]

On Thu, 2020-03-19 at 09:44 +0000, Olivier Tilloy wrote:
> It looks like symlinking firefox and thunderbird's own copies of
> libnssckbi.so to the system-wide p11-kit-trust.so is the proper way to
> fix this bug, as far as Mozilla's products are concerned.
> 
> Before I proceed to doing this, I'd welcome comments from the security
> team on this approach though, as I suspect I don't understand all the
> implications.
> 
> (an alternative would be building firefox/thunderbird against the
> system-wide nss, but firefox currently requires 3.50, which isn't yet in
> focal, and I suspect that requirement is being bumped often, so that
> wouldn't really work with our distribution model)

Right, don't bother trying to replace NSS just for this (although
really, having a single version of NSS on the system *would* be nice).

The interface to libnssckbi.so is a standard PKCS#11 library, and it's
perfectly reasonable to replace that in each of
firefox/thunderbird/chromium individually.

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https://bugs.launchpad.net/bugs/1647285

Title:
  SSL trust not system-wide

Status in ca-certificates package in Ubuntu:
  Confirmed
Status in firefox package in Ubuntu:
  Confirmed
Status in nss package in Ubuntu:
  Confirmed
Status in p11-kit package in Ubuntu:
  Fix Released
Status in thunderbird package in Ubuntu:
  Confirmed

Bug description:
  When I install a corporate CA trust root with update-ca-certificates,
  it doesn't seem to work everywhere. Various things like Firefox,
  Evolution, Chrome, etc. all fail to trust the newly-installed trusted
  CA.

  This ought to work, and does on other distributions. In p11-kit there
  is a module p11-kit-trust.so which can be used as a drop-in
  replacement for NSS's own libnssckbi.so trust root module, but which
  reads from the system's configured trust setup instead of the hard-
  coded version.

  This allows us to install the corporate CAs just once, and then file a
  bug against any package that *doesn't* then trust them.

  See https://fedoraproject.org/wiki/Features/SharedSystemCertificates
  for some of the historical details from when this feature was first
  implemented, but this is all now supported upstream and not at all
  distribution-specific. There shouldn't be any significant work
  required; it's mostly just a case of configuring and building it to
  make use of this functionality. (With 'alternatives' to let you
  substitute p11-kit-trust.so for the original NSS libnssckbi.so, etc.)

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