and that there are
some non-trivial advantages to carrying authorizations in-band.
I don't wish to speak for Melinda, but this is a view shared by many
within my own community.
I have a long list of applications, collected from within this
community, with which they would like to use SAML-based
Interesting. Any interest to share it with us?
I'm in the process of trying to flesh it out at the moment, in a
collaboration with some of the communities concerned, so that we can
articulate some concrete use-cases. At the moment the list covers pretty
much everything that is presently used in an Inter-Institutional context
(AFS, SSH, VNC, RDP, SIP, SMTP, NEA, ...).
and it seems to me that the ability for application
protocols to share
a common mechanism for expressing authorisation would mitigate or
perhaps even avoid the need to make application-specific
My experience: authorization is often related to the specific
I agree insofar as 'authorisation' is often an exercise in making
statements using semantics that are specific to application domains, but
I don't believe it follows that the syntactical and transport elements
(that support the semantic expression) also need to be specific to the
Furthermore, working on SIP SAML I noticed the problems when
you go down to specific solutions scenarios.
Can you expand?
(The fact that SAML-based Web SSO uses SAML that is bound to the
application-layer is, I believe, only an artifact of a
avoid modifying contemporary Web browsers and I don't think it is an
approach that would necessarily be desirable for the general case.)
... a reasonable transition plan, in my view.
The reason for the success of these IdM solutions,
(Well - OpenID has been a flop in my opinion. It has its uses, but not
very interesting ones. But I digress...)
Binding authorisation to TLS, as suggested by this document, is one
approach that would satisfy the 'common mechanism'
requirement indicated previously.
Looking forward to see your solutions.
I have no answers; I'm still trying to figure out what the questions are
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