[Openid-specs-ab] Spec call notes 17-Oct-13

Mike Jones Michael.Jones at microsoft.com
Thu Oct 17 16:34:09 UTC 2013

I actually think that getting the features right, such that developers will actually use what's in the spec, rather than do something non-conformant, is more important than a few days of schedule.

It's pretty telling that Google, Ping, and Microsoft all are using something other than fragment encoding in some cases for Implicit/Hybrid flows.  Far better to enable interop on these non-fragment return types than have everyone do something outside the spec.

As we said on the call, I'll write up a concrete proposal so people can review it in advance of Monday.

Yes, we're late in the process, but far better to make a late addition than to ship something that we know has defects that will cause people to do things not in the spec.

                                                            -- Mike

From: Nat Sakimura [mailto:sakimura at gmail.com]
Sent: Thursday, October 17, 2013 9:19 AM
To: Mike Jones
Cc: openid-specs-ab at lists.openid.net
Subject: Re: [Openid-specs-ab] Spec call notes 17-Oct-13

Please add to the note that Nat has pointed out that this is not the time to add a new feature that it can and should be dealt with extension.

Also, John has pointed out that expanding the feature will cause interoperability problems.

As part of the AOL's OpenID 2.0 provider explanation, it was pointed out that the UI would show flash and button, and that was the reason we have dropped it from the current Connect spec.
In fact, not only AOL but many others did it in OpenID 2.0 as that was the only option, and it was also something that many of us wanted to escape from.

The reason sited in support of form POSTing were as follows:

1) It is done by SAML and WS.
2) Fragment would not be able to hold large payload.
3) If it is not there, implementers will do stupid things like including access token in the query parameter.
4) If the browser is not Javascript enabled, it is the last resort.

In the above, 1) does not make sense. The web technology has advanced so much since they were designed. We have considered the option previously and dropped.
As to 2) is concerned, the statement is false. Fragment can hold pretty big payload. It was tested during the self-issued testing, and we found out that the limit is actually pretty large. We were sending photos as a claim in id_token as a result of it. (Note: I need to double check - since we were concerned mostly on mobile platform, we may not have tested IE.)
The reason 3) is not a good one either. We should just write an implementers NOTE that they should never do this.
As a result, only the credible reason is 4). However, this means that a lot of other things at the destination site will break, too.

I understand that there are people who want to do it.
Even some of NRI's internal developers wants to do it.
However, that is not a good enough reason to get it into the core at this point in time.
In addition, there will be bunch of moving parts that we have to fix if we were to do it.
We should not do it in three days. We should take more time to consider various implications.
We are finalizing the core spec now. The cut off date is end of this week.

It should be done as an extension. I oppose to do it in the core.
Our priority to get the Core out of the door, now.

2013/10/17 Mike Jones <Michael.Jones at microsoft.com<mailto:Michael.Jones at microsoft.com>>
Spec call notes 17-Oct-13

Mike Jones
Brian Campbell
George Fletcher
John Bradley
Nat Sakimura
Edmund Jay

               Open Issues
               Multiple response type requests returning values in ways other than fragments
               Document Restructuring and Review

Open Issues:
               #873: session 4.1. Can we use opbs with http (not httponly)
                              We developed proposed text for this
               #879 & #880: Hosting self-issued.me<http://self-issued.me>
                              John will get the cheapest Amazon VM and give Edmund access to it

Multiple response type requests returning values in ways other than fragments
               Microsoft has asked for a POST binding, like WS-Federation and SAML have
               Ping has an extra response_type component x_post
                              This causes the responses to POST to be returned as form-encoded body content
               Google has a way of registering clients to use a postMessage binding
                              They do that by registering a JavaScript origin, rather than response_type
               AOL's OpenID 2.0 provider often uses the POST response because of large AX responses
               John had proposed a registration parameter for this:
                              redirect_type   fragment | POST | postMessage
               This would be discoverable as
               Another reason for this is to not hit fragment size limits
               Mike will file a bug on this to make a concrete proposal
               We will discuss this at the Monday meeting

Document Restructuring and Review:
               Mike posted a Word version of the Core spec with tracked changes turned on
                              People are requested to mark it up with specific proposed changes this week

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Nat Sakimura (=nat)
Chairman, OpenID Foundation
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