authentication vs authorization was Re: [OpenAFS] 1.3.70 and aklog

[Jeffrey Altman]

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> OK, that would be acceptable.  I would also agrue that the krb524d
> or gssklogd where principals in a k5 realm where mapped to users
> in a AFS realm was in effect an extension of the PTS authorization.
> Maping authentication names to a authorization name.

This is where we disagree.  Names are not a authorization entity.
The entry of a name in a .k5login file is an authorization entity.
The entry of a name in an acl is an authorization entity.  A name
itself is not.

A token is not an authorization entity; it is an authentication
entity.  As such the authenticated name should not be altered until
such time as it is presented to the authorization database.
Otherwise, you give up the ability to audit and distinguish between
two different trust paths.  The path running though gssklogd via
FOO.COM and BAR.COM are different paths.  The path which runs through
krb524d is a different one.  The path which uses straight klog is
an additional one.

This very much parallels the discussions related to PKINIT.  We
are converting an authentication entity from one format to another.
It is very important for there to be a well-defined mapping and
for the trust path to be validated by the authorization service.

The only thing which can be preserved in the k4 style token is the
name.  There is no other path information we can use to determine
whether or not that name is trustworthy.  Therefore, distinctions
between different authentication identities should be preserved
up until the time the authorization database needs to make a
decision on what access to grant.

Jeffrey Altman


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