[krbdev.mit.edu #7797] git commit

[Tom Yu via RT]

Fix SPNEGO one-hop interop against old IIS

IIS 6.0 and similar return a zero length reponse buffer in the last
SPNEGO packet when context initiation is performed without mutual
authentication.  In this case the underlying Kerberos mechanism has
already completed successfully on the first invocation, and SPNEGO
does not expect a mech response token in the answer.  If we get an
empty mech response token when the mech is complete during
negotiation, ignore it.

[ghudson at mit.edu: small code style and commit message changes]

(cherry picked from commit 37af638b742dbd642eb70092e4f7781c3f69d86d)

https://github.com/krb5/krb5/commit/9dedd1408cc26015a8becc6341a15225ebafe1e4
Author: Greg Hudson <ghudson at mit.edu>
Committer: Tom Yu <tlyu at mit.edu>
Commit: 9dedd1408cc26015a8becc6341a15225ebafe1e4
Branch: krb5-1.12
 src/lib/gssapi/spnego/spnego_mech.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)