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Subject: [security-services] FW: [security-bindings] Multiple authn assertionsin one Browser Artifact Profile exchange?


-----Original Message-----
From: Irving Reid
To: 'security-bindings@lists.oasis-open.org'
Cc: Tahura Chaudhry
Sent: 11/19/01 7:11 PM
Subject: [security-bindings] Multiple authn assertions in one Browser
Artifact Profile exchang	e?

In the browser artifact profile as described in the bindings-06 document
, section 4.1.5), lines 565-567 imply that more than one authentication
assertion could be transferred. This raises all sorts of questions about
the receiver should behave, particularly if the authn assertions refer
different subjects.

Do we want to say anything more about this? Alternatives include:

(a) Make no changes to the spec. Implementers are free to choose
behaviour they think is appropriate for their solution.

(b) Specify that all authn assertions must contain the same Subject (or
least, the same NameIdentifier within the Subject)

(c) Specify exactly how the receiver should behave. Two possibilities
are to
say that access should be allowed if any one of the Subjects would be
allowed, or that access should only be allowed if all of the Subjects

My life would be easiest if we choose (b), though I could see how it
be too severe a constraint on some applications.

 - irving - 

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