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

[Robie Basak]

<rbasak> tjaalton: looking at bug 1643708, I'm concerned that there's
nothing in the test plan to make sure that existing users of the SPNEGO
are not broken, so I'm not comfortable releasing it even though it is
verification-done now. As an aside the reporter possibly hasn't checked
all three releases. Could you take care of it please?

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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:
  Fix Committed
Status in krb5 source package in Xenial:
  Fix Committed
Status in krb5 source package in Yakkety:
  Fix Committed

Bug description:
  [Impact]
  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.

  [Test Case]

  create a file with some credentials:

  $ echo F23:guest:guest > ~/ntlmcreds.txt
  $ export NTLM_USER_FILE=~/ntlmcreds.txt
  $ python
  import gssapi

  spnego = gssapi.raw.oids.OID.from_int_seq('1.3.6.1.5.5.2')
  c = gssapi.creds.Credentials(mechs=[spnego], usage='initiate')
  tname = gssapi.raw.names.import_name("F23/server", name_type=gssapi.raw.types.NameType.hostbased_service)
  ac = gssapi.creds.Credentials(mechs=[spnego], usage='accept')

  seci = gssapi.SecurityContext(creds=c, name=tname, mech=spnego, usage='initiate')
  seca = gssapi.SecurityContext(creds=ac, usage='accept')
  it = seci.step(token=None)
  ot = seca.step(token=it)
  it = seci.step(token=ot)
  ot = seca.step(token=it)
  it = seci.step(token=ot)

  e = seci.wrap("Secrets", True)
  o = seca.unwrap(e.message)

  o.message
  'Secrets'

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