disallow requests naming principal as a service
Nicolas.Williams at ubsw.com
Wed Mar 27 15:44:01 EST 2002
On Wed, Mar 27, 2002 at 03:34:49PM -0500, Sam Hartman wrote:
> >>>>> "Nicolas" == Nicolas Williams <Nicolas.Williams at ubsw.com> writes:
> It is
> Nicolas> generally the case that Kerberos clients fetch service
> Nicolas> tickets before attempting to connect to the services,
> Nicolas> after all.
> No, actually, neither SASL nor GSSAPI SPNEGO nor the GSSAPI support in
> Ssh does this. In IETF protocols that use Kerberos, you tend to have committed to Kerberos before you get the service ticket.
Yes, I needed caffeine when I wrote that :)
> My main problem with the KDC negotiation of U2U is that encouraging
> its use encourages bad protocol design. We want people to negotiate
> whether to use Kerberos at all; when they do that negotiation they
> might as well do the U2U negotiation at the same time. So for
> properly designed protocols the KDC negotiation is unnecessary.
I now agree fully.
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