disallow requests naming principal as a service

[Nicolas Williams]

On Tue, Mar 26, 2002 at 09:18:07AM -0600, Matt Crawford wrote:
> > Thanks Nico, this solution looks OK to me.
> > 
> > It modifies the current semantics of KRB5_KDB_DISALLOW_SVR 
> > a bit -- hope that's OK.  Besides allowing U2U on a princ that is
> > set DISALLOW_SVR,
> 
> The proposed change is OK for my site also, but I'd like to hear
> whether it will break someone else's existing deployment.

Why would it? How could it? It's not like enabling U2U opens up any
vulnerabilities.

> > it will not support a princ that may be a 
> > normal service but must not be used with dup_skey service 
> > tickets.
> 
> Eh?  It looks to me like it covers that.

I think the first "not" above was not meant to be there.

> > Long term, I'd prefer
> > using  KDC_ERR_MUST_USE_USER2USER and report that back to the 
> > client when you see that DUP_SKEY is allowed but SVR is not.
> 
> Well, kerberos-revisions has defined that error code ...

John's post makes things interesting. Check it out.

Cheers,

Nico
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