[OpenAFS-devel] Re: Initial implementation of RestrictedQuery, please comment

Jeffrey Altman jaltman@secure-endpoints.com
Wed, 19 Mar 2014 00:48:48 -0400


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On 3/18/2014 1:22 PM, Jeffrey Hutzelman wrote:
> On Tue, 2014-03-18 at 12:07 -0500, Andrew Deason wrote:
>=20
>> With an anonymous connection, all you have is an IP, which is not grea=
t.
>> Requiring an rxkad-authenticated connection would give you a krb5
>> principal name (possibly restricted to specific realms), which is
>> better. This becomes useless if you can create a kind of anonymous krb=
5
>> identity (I think this is possible in some setups? or it's being
>> discussed?), but the krb5 administrator should be able to control that=
=2E
>=20
> Yes, Kerberos has a mechanism for "anonymous" authentication, where the=

> server doesn't get to know the client's identity, and the KDC may not
> even know it.  That has to be enabled at the KDC, and shows up to
> application servers primarily as a special principal name.  For service=
s
> that do "real" authorization, rather than "anyone who can get a ticket"=
,
> this is not an issue.  If you're going to add that type of lightweight
> "authorization" to AFS, you should exclude anonymous principals.
>=20
> Probably, rxkad should refuse krb5 tickets for the anonymous principal,=

> or something.  Though it might not be a stretch to consider an anonymou=
s
> foreign-realm user to be a member of system:authuser@that.realm.
> However, that would be a separate patch.

I don't think so.  Anonymous kerberos can be used by cache managers
to protect the anonymous connections to AFS services.   I see no reason
they shouldn't be treated as the Anonymous ID just as Kerberos
principals that do not have an assigned AFS ID in the protection
database are given the Anonymous ID.

Adding logic to ensure that the Anonymous principals must be treated as
the Anonymous ID and cannot be assigned an ID does make sense to me.

Jeffrey Altman



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