[Bug 1643708] Re: Add SPNEGO special case for NTLMSSP+MechListMIC

[Robie Basak]

> The test case in
https://github.com/krb5/krb5/pull/436#issuecomment-209017277 is the best
we can offer without going through the trouble of setting up OMI.

This is fine, but it should be explained in this bug so people
processing this update do not get confused. Please follow
https://wiki.ubuntu.com/StableReleaseUpdates#Procedure step 3, which is
not yet complete. If you can't edit the bug description, adding that
information in a comment is fine.

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https://bugs.launchpad.net/bugs/1643708

Title:
  Add SPNEGO special case for NTLMSSP+MechListMIC

Status in krb5 package in Ubuntu:
  Fix Released
Status in krb5 source package in Trusty:
  Incomplete
Status in krb5 source package in Xenial:
  Incomplete
Status in krb5 source package in Yakkety:
  Incomplete

Bug description:
  MS-SPNG section 3.3.5.1 documents an odd behavior the SPNEGO layer
  needs to implement specifically for the NTLMSSP mechanism.  This is
  required for compatibility with Windows services.

  Upstream commit:
  https://github.com/krb5/krb5/commit/cb96ca52a3354e5a0ea52e12495ff375de54f9b7

  We've run into this issue with Linux to Windows negotiation with
  encrypted http using GSSAPI.

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