Perhaps I gave the wrong impression about protecting a
policy repository.
During
the discussons which led to XACML 3.0 it was pointed out that with XACML 2.0 (or
any version really) you can protect operations such as CRUD on a repository.
However this approach would not let you control the scope of capabilities of a
person editing policies.
I
suppose we could have consider using XPATH functions to introspect policy
contents, but I think the result would have made it very hard to understand the
intent of administrative policies.
For
whatever reasons this approach was not seriously considered and instead we chose
the scheme you see in the Admin Profile.
Influenced by the requirement to be allowed to provide
policies along with the request, we formulated Reduction as a policy decision
time process instead of an administration time process. Since the current scheme
allows access policies and their enabling administrative polices to reference
distinct attributes, there is no good way to determine if an access policy is in
force, except in the context of a particular decision.
Hal
-----Original Message-----
From: Harold Lockhart
Sent: Thursday, July 16, 2009 10:20 AM
To:
Subject: [xacml] FW: some little
questions
-----Original Message-----
From: Jan Herrmann
[mailto:]
Sent: Thursday, July 16, 2009 8:43
AM
To: Harold Lockhart
Subject: some little
questions
Hello
Hal,
I modified the slides from the
Boston meeting
a little bit to focus the things that might be of interest for your group.
Now I am wondering how you usually
do presentations during your telecons. Are you using google docs or special
tools like team viewer?
Another question: In Boston you mentioned
that a couple of years ago the XACML TC discussed how to administrate XACML
policies. You mentioned that using XACML itself to do control access to a PAP
Web Service was rejected and instead the mechanism described in the new
delegation profile was preferred. Are their any internal documents talking
about the reasoning behind this decision?
Talk to you
later.
greets
jan
________________________________________
Jan
Herrmann
Dipl.-Inform., Dipl.-Geogr.
wissenschaftlicher
Mitarbeiter
Technische Universität
München
Institut für Informatik
Lehrstuhl für Angewandte Informatik
/ Kooperative Systeme
Boltzmannstr. 3
85748
Garching
Tel:
+49 (0)89 289-18692
Fax: +49 (0)89 289-18657
www11.informatik.tu-muenchen.de
________________________________________
