[Openid-specs-ab] [External Sender] Re: IDP Hint for /authorization requests

[George Fletcher]

So it seems that we have many implementations of this concept. I think what
I'm looking for is whether we should try and standardize a parameter for
this use case, or just leave each domain to define their own way to enable
this functionality.

Thanks,
George

On Wed, Aug 3, 2022 at 10:22 AM Marcus Hardt via Openid-specs-ab <
openid-specs-ab at lists.openid.net> wrote:

> Hi There,
>
> we've gone through this exercise within the AARC project. The scenario is
> slightly more complex (we have this proxy architecture, and we're
> protocol-agnostic-enough so that's also implementable in SAML), but I
> think your use-case is fully covered in AARC-G061 [1].
>
> [1] https://aarc-community.org/guidelines/aarc-g061/
>
>
> The longer part of the story is, that we originally had the 'idphint'
> parameter, which was too loosely defined. Hence we defined it as
> 'aarc_idp_hint'.
>
> Essentially, it is a single-values url-encoded StringOrURI.
>
> The actual value is not specified, but I think it is generally assumed to
> refer to either an 'iss' or in SAML to an 'entityID'.
>
>
> If this aarc recommendation is not enough or too much from your
> perspective, I think the original authors could be motivated to
> participate in the discussion here.
>
> Best,
> Marcus.
>
>
> On 02. Aug 2022 11:22, George Fletcher wrote:
> > Hi,
> >
> > I know I've mentioned this in the past and wanted to bring it up again.
> If
> > an OpenID Provider allows for federation with multiple IDPs, there are
> > times the client wants to "tell" the OP which of those federated IDPs to
> > use.
> >
> > In a social login context, this can allow the client to specifically tell
> > the OP to use Facebook for authenticating this user. However, this
> pattern
> > is used in many other contexts.
> >
> > Any interest in writing a very small spec to enable an 'idp_hint'
> parameter
> > that can be passed as part of the /authorization request? I suppose this
> > could also go to the IETF as it's not specific to ODIC.
> >
> > Thoughts?
> >
> > Thanks,
> > George
> >
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