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JISC-SHIBBOLETH  May 2007

JISC-SHIBBOLETH May 2007

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Subject:

Re: ScopedAffiliation

From:

Andy Swiffin <[log in to unmask]>

Reply-To:

Discussion list for Shibboleth developments <[log in to unmask]>

Date:

Tue, 1 May 2007 16:19:22 +0100

Content-Type:

text/plain

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text/plain (54 lines)

Hi Rhys

Thanks for the hyper fast reply!

> We have a multi-valued attribute on every person in the directory,
> showing their affiliation. Our IDM drives the content of this
attribute
> - putting "member", "student", "staff", etc in as befits the person
(the
> business rules in our IDM know which to put in). 

Yes, that's pretty much what I'm planning on doing (no great
surprise!).

> 
> If you have a multivalued attribute, the IdP software will release
all
> of the values - unless your ARP is blocking it from doing so, of
course
> (as you would definitely do with an entitlement value for privacy
> reasons).

OK, I suspected this might be the case, although the "Technical
Recommendations for Participants" document says:

"7.1.2.3 Generating and Interpreting eduPersonScopedAffiliation

It is recommended that identity providers have the ability either to
maintain
these multiple values for a given individual, or otherwise provide the
ability
to release either value as appropriate for a particular service
provider. For
example, although some service providers might require the release of
the
more specific student value, a different service provider that only
requires the less specific member value should only be sent the less
specific
value. Releasing student in this case gives the service provider more
information about the user than is required, raising privacy and data
protection concerns."


I take it that the limiting factor here is the current IdP software
which simply doesn't do this?


From what I've read, I understand that the ARP is something I can
configure on a per SP basis?  I note that the Shibboleth-Athens
integration guide specifies  'Entitlement' as one of the attributes we
need to populate and supply in that case?

Cheers
Andy

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