Fix two unrelated problems in SPNEGO which don't crop up with the krb5
mechanism.

1. The third call to spnego_init_accept_context uses faulty logic to
determine if the exchange is complete, preventing a third mech token
from being sent to the acceptor if no MIC exchange is required.
Follow the logic used in the second call (in init_ctx_nego), which is
correct.

2. If the acceptor selects a mech other than the optimistic mech, it
sets sc->mic_reqd to 1 whether or not the selected mech supports MICs
(which isn't known until the mech completes).  Most code outside of
handle_mic checks sc->mic_reqd along with (sc->ctx_flags &
GSS_C_INTEG_FLAG), but the code in acc_ctx_call_acc neglected to do
so, so it could improperly delegate responsibility for deciding when
the negotiation was finished to handle_mic--which never gets called if
(sc->ctx_flags & GSS_C_INTEG_FLAG) is false.  Fix acc_ctx_call_acc to
check sc->ctx_flags so that mechs which don't support integrity
protection can complete if they are selected non-optimistically.


https://github.com/krb5/krb5/commit/d1da896d356bc80e632a9713e5b4246384fb3e77
Commit By: ghudson
Revision: 23742
Changed Files:
U   trunk/src/lib/gssapi/spnego/spnego_mech.c