I don't know if there is some more uniform way of doing so, but a
quick-and-dirty solution to the user quota problem is to let the
services decide if the user has exceeded its quota. So when the user
provides a token id to the service shall:

1. Ask the SSO server if the token is valid and
2. If the user is authorized to perform the action and
3. Retrieve the 'id' of the user. Then count the total number of the
resources generated (on this server) by this user and decide if the user
is allowed to generate one more resource.

What I mean by user 'id' is some UUID generated to uniquely identify a
user since the name of the user might change, so this 'id' will be
something more "static" (Of course the user will not have to know this
id).

I think we could go with this workaround. Any opinions on that?

Best regards,
Pantelis


On Wed, 2010-06-16 at 19:31 +0300, Luchesar V. ILIEV wrote:
> I'd say that finding ready-made suitable accounting solution for
> OpenTox is almost impossible. We have seen that even just AA presents
> significant challenge because of the specifics of our data that need
> to be protected. So, if we really want to have quotas implemented,
> that almost certainly means we need to develop the system to handle
> them.
> 
> Cheers,
> Luchesar
> 
> 
> On Tue, Jun 15, 2010 at 14:31, Andreas Maunz <andreas at maunz.de> wrote:
> > Nina Jeliazkova wrote on 06/15/2010 01:19 PM:
> >>>>>
> >>>>> 3. Every user should be allowed to make use of a pre-specified fraction
> >>>>> of the server's storage capacity which simply means that there should
> >>>>> be
> >>>>> an upper bound on the number of models a user can create (say 50000 or
> >>>>> something like that). How can such a constraint be established using
> >>>>> policies?
> >>>>>
> >>>> Quota support is something we had not yet discussed, but it is indeed
> >>>> important.
> >>>>
> >>>
> >>> Is there some perspective of accomplishing this kind of authorization
> >>> using SSO or web services should take that on?
> >>>
> >> This is actually accounting, not authorisation, and we hadn't considered
> >> it at all.   I am slightly in favour of separating accounting from
> >> services.
> >>
> >> Andreas, what do you think?  Does OpenSSO provide a solution for AAA ?
> >
> > No, I don't think it does. OpenSSO is originally designed to have a single
> > administrator for managing policies and not for different users creating
> > their individual policy (although this is in the pipeline of development at
> > the moment). Therefore, the aspect of controlling the number of policies has
> > been neglected.
> > Other aspects of accounting (e.g. failed attempts to authenticate) are
> > explicitly covered by a special logging service, but I don't think quota is.
> >
> > Regards
> > Andreas
> > _______________________________________________
> > Development mailing list
> > Development at opentox.org
> > http://www.opentox.org/mailman/listinfo/development
> >
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