[Openid-specs-mobile-profile] [Openid-specs-fapi] Decoupled flows for OAuth 2
anders.rundgren.net at gmail.com
Sat Mar 3 10:31:09 UTC 2018
On 2018-03-01 17:05, Dave Tonge via Openid-specs-fapi wrote:
> 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 time.
Since you mention QR codes, the following could maybe be of some interest:
It though requires major HW/SW support to happen so I guess NFC in PCs won't really make it (which is kind of odd since "Phones as Tokens" is already used by hundreds of millions of people).
> 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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