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[Launchpad Bug Tracker <1643708@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package krb5 - 1.13.2+dfsg-5ubuntu1

---------------
krb5 (1.13.2+dfsg-5ubuntu1) xenial; urgency=medium

  * d/p/upstream/0001-Add-SPNEGO-special-case-for-NTLMSSP-MechListMIC.patch:
    Cherry-pick from upstream to add SPNEGO special case for
    NTLMSSP+MechListMIC.  LP: #1643708.

 -- Steve Langasek <steve.langasek@xxxxxxxxxx>  Mon, 21 Nov 2016
17:28:15 -0800

** Changed in: krb5 (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

** Changed in: krb5 (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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

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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