[Openid-specs-mobile-profile] Decoupled flows for OAuth 2

Dave Tonge dave.tonge at momentumft.co.uk
Thu Mar 1 16:05:38 UTC 2018

Hi all,

I would be interested in feedback from those on the list around 2 issues
that we have with decoupled flows such as CIBA:

1. "Session binding", i.e. ensuring it is the same user on the
authentication device and the consumption device

2. Obtaining an identifier for the user

For more on issue no.1, please see the attached discussion paper that I've
prepared for the OAuth Security Workshop in Italy in a couple of weeks

Issue no.2 is summarised as follows: in redirect-based flows the client
doesn't need to know or pass any user identifier to the authorisation
server. In decoupled flows, this changes and the client has to pass some
identifier to the authorisation server. This is a potential privacy issue
and could allow clients to initiate an auth flow without the users consent,
potentially tricking a user into granting access.

I have received some suggestions around using QR codes to provide unique,
single-use (possible time-based) identifiers but I would be interested in
further discussion on the list about these ideas.


Dave Tonge
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