Please Review Changes to Windows Exports List for krb5 1.2.5 in KfW 2.2

Nicolas Williams Nicolas.Williams at
Tue Apr 16 09:30:00 EDT 2002

Unfortunately, this is a limitation of the protocol in that there is no
in-band mechanism for clients to learn about trust relationships.

Perhaps with the new holes in extensions it will be possible for KDCs
to send fresh information about trust relationships to the clients.
Alternatively a better OOB mechanism than krb5.conf can be arrived at
for distributing trust relationship information to clients; say, LDAP.

There is also a limitation in the MIT krb5 API in that each ccache (and
I know very little about CCAPI, this may not apply to it) can only
contain creds for one client principal, so even having multiple initial
TGTs and complete trust information in krb5.conf, unless there is an API
that takes multiple ccaches as input there is no way to do what you want
with a single API call.

But, so what? What's wrong with a loop trying each ccache you have?

As long as the API can cache negative results and/or fully utilize
krb5.conf trust information it should be able to avoid unnecessary KDC
exchanges most of the time.

As for the KRB5_SERVICE_UNKNOWN error, perhaps a new KRB5_NO_XREALM_PATH
error would help.


On Mon, Apr 15, 2002 at 05:38:16PM -0400, Jeffrey Altman wrote:
> I didn't say there was a way to do it today.  I just said that it is
> what I want. 
> What I am trying to avoid is the almost useless error:
>   Server not found in realm 
> when trying to authenticate with the wrong credentials.
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