October 2016 - WG-UMA - mailman.kantarainitiative.org

Re: [WG-UMA] Pre-registration of the client's callback claims_redirect_uri: comment requested
by Justin Richer 18 Oct '16

18 Oct '16

That's fine. Seems odd to call it "regular" but I see what you're getting at. I don't have a better suggestion at the moment. --Justin Sent from my phone -------- Original message --------From: Eve Maler <eve(a)xmlgrrl.com> Date: 10/17/16 12:40 PM (GMT-05:00) To: Justin Richer <jricher(a)mit.edu> Cc: "wg-uma(a)kantarainitiative.org UMA" <wg-uma(a)kantarainitiative.org> Subject: Re: [WG-UMA] Pre-registration of the client's callback claims_redirect_uri: comment requested After James pinged me with some comments suggesting more normative-ness in a specific direction, I thought I'd try out this variant: "Note that claims redirection URIs are different from regular OAuth redirection URIs in that they are intended for the exclusive use of requesting parties and not resource owners. Therefore, authorization servers MUST NOT redirect requesting parties to regular pre-registered OAuth redirection URIs unless such URIs are also pre-registered as claims redirection URIs." Eve Maler Cell +1 425.345.6756 | Skype: xmlgrrl | Twitter: @xmlgrrl On Mon, Oct 17, 2016 at 1:51 PM, Eve Maler <eve(a)xmlgrrl.com> wrote: In that case, wouldn't the following be sufficient? "Note that claims redirection URIs are distinct from regular OAuth redirection URIs; they are intended for the exclusive use of requesting parties and not resource owners." Eve Maler Cell +1 425.345.6756 | Skype: xmlgrrl | Twitter: @xmlgrrl On Mon, Oct 17, 2016 at 1:02 PM, Justin Richer <jricher(a)mit.edu> wrote: No, that’s too proscriptive. If the client wants to use the same URI to do both, it should be allowed to. The important thing is that it’s two different values from the perspective of the AS. Thus two different field names in the client data model. The AS should never compare them to each other nor be given a hint that it should (as the text below suggests). — Justin On Oct 17, 2016, at 4:18 AM, Eve Maler <eve(a)xmlgrrl.com> wrote: Ah, okay. The rationale got lost in the shuffle. The original is in the right direction, but needs more explanation and disambiguation, I think: "Because the claims redirection URIs of a client are intended for the exclusive use of requesting parties and not resource owners, if a client pre-registers redirection URIs at all, any claims redirection URIs must be different from any other redirection URIs to be used by the authorization endpoint during redirect-based OAuth flows." Is this accurate? Eve Maler (sent from my iPad) | cell +1 425 345 6756 On Oct 17, 2016, at 2:03 AM, Justin Richer <jricher(a)mit.edu> wrote: Yes, the separation is still very much necessary. Remember, we’re folding together the *back* channel and not the *front* channel, because the parties are different on the front channel in UMA vs. OAuth (namely, RqP vs. RO). The claims_redirect_uri and redirect_uri are all about returning data from the front channel. We’ve gotten rid of the rpt_endpoint because that was a special back channel endpoint that’s no longer necessary. If we were using the authorization endpoint then we could use the same redirect_uri as in OAuth, but we’re not. Why aren’t we? Because then the RqP would need to be treated much like a RO at the resource server — which is to say, Bob needs to be treated like Alice. But it’s not Bob’s server and we can’t (and shouldn’t) assume that he’ll be treated the same as she will. Recall that this mistaken assumption is at the core of deployment issues with the AAT for anything beyond a very narrow ecosystem where everyone is using the same AS. — Justin On Oct 16, 2016, at 2:17 PM, Eve Maler <eve(a)xmlgrrl.com> wrote: Cigdem did a close reading of the spec draft, for which I'm grateful. In addition to finding an error in the config data example that I was able to fix in the forthcoming rev 05), she also noticed some ambiguous language here: Sec 3.6.2 rev 04:"claims_redirect_uriOPTIONAL. The URI to which the client wishes the authorization server to direct the requesting party's user agent after completing its interaction. The URI MUST be absolute, MAY contain an application/x-www-form-urlencoded-formatted query parameter component that MUST be retained when adding additional parameters, and MUST NOT contain a fragment component. The authorization server SHOULD require all clients to register their redirection endpoint prior to utilizing the authorization endpoint (either using a static process or throughRFC7591 (at line 1749) or [OIDCDynClientReg]). The claims redirection URIs of a client MUST be registered distinct from the client's redirection URIs as used at the authorization endpoint during redirect-based OAuth flows. If the URI is pre-registered, this URI MUST exactly match one of the pre-registered claims redirection URIs, with the matching performed as described in Section 6.2.1 of RFC3986 (at line 1756) (Simple String Comparison)." She commented: "Section 3.6.2, in the “claims_redirect_uri” description, I was a bit confused about what is a MUST and what is a should? Is it a MUST that the client pre-registers the claims_redirect_uri? Then the sentence, “If the URI is pre-registered” should not have an If?" First, we could improve the language generally to do away with the passive and ambiguity (some of which came from the original OAuth passage). But second, is it still necessary for us to be segregating UMA client redirect callback URIs from OAuth client callback URIs? With an UMA client adhering to a formal UMA extension grant of OAuth soon enough, will it be a distinction without a difference? Here's a revision that attempts to fix the former problem and also keep the original semantic, in case we need it. Changes bolded. The sentence in bold red could be removed if we think it's pointless now. "claims_redirect_uriOPTIONAL. The URI to which the client wishes the authorization server to direct the requesting party's user agent after completing its interaction. The URI MUST be absolute; MAY contain an application/x-www-form-urlencoded-formatted query parameter component that the authorization server MUST retain when redirecting the requesting party back, whether or not it adds any other parameters; and MUST NOT contain a fragment component. The authorization server SHOULD require all clients to register their redirection endpoint prior to utilizing the authorization endpoint (either using a static process or through RFC7591 or [OIDCDynClientReg]). If the authorization server does require clients to register redirection endpoints, it MUST require clients using UMA grants to register claims redirection URIs distinct from clients using other OAuth grants. If a client has pre-registered a URI, then the URI it supplies here MUST exactly match one of its pre-registered claims redirection URIs, with the matching performed as described in Section 6.2.1 of RFC3986 (Simple String Comparison)." Discussion and comment welcome, especially prior to next Friday's call so that we can take care of this issue expeditiously. Thanks! Eve Maler Cell +1 425.345.6756 | Skype: xmlgrrl | Twitter: @xmlgrrl _______________________________________________ WG-UMA mailing list WG-UMA(a)kantarainitiative.org http://kantarainitiative.org/mailman/listinfo/wg-uma

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Pre-registration of the client's callback claims_redirect_uri: comment requested
by Eve Maler 17 Oct '16

17 Oct '16

Cigdem did a close reading of the spec draft, for which I'm grateful. In addition to finding an error in the config data example that I was able to fix in the forthcoming rev 05), she also noticed some ambiguous language here: Sec 3.6.2 rev 04 <https://docs.kantarainitiative.org/uma/ed/uma-core-2.0-04.html#rfc.section.…> : "*claims_redirect_uri* OPTIONAL. The URI to which the client wishes the authorization server to direct the requesting party's user agent after completing its interaction. The URI MUST be absolute, MAY contain an application/x-www-form-urlencoded-formatted query parameter component that MUST be retained when adding additional parameters, and MUST NOT contain a fragment component. The authorization server SHOULD require all clients to register their redirection endpoint prior to utilizing the authorization endpoint (either using a static process or throughRFC7591 (at line 1749) or [OIDCDynClientReg]). The claims redirection URIs of a client MUST be registered distinct from the client's redirection URIs as used at the authorization endpoint during redirect-based OAuth flows. If the URI is pre-registered, this URI MUST exactly match one of the pre-registered claims redirection URIs, with the matching performed as described in Section 6.2.1 of RFC3986 (at line 1756) (Simple String Comparison)." She commented: *"Section 3.6.2, in the “claims_redirect_uri” description, I was a bit confused about what is a MUST and what is a should? Is it a MUST that the client pre-registers the claims_redirect_uri? Then the sentence, “If the URI is pre-registered” should not have an If?"* First, we could improve the language generally to do away with the passive and ambiguity (some of which came from the original OAuth passage <https://tools.ietf.org/html/rfc6749#section-3.1.2>). But second, is it still necessary for us to be segregating UMA client redirect callback URIs from OAuth client callback URIs? With an UMA client adhering to a formal UMA extension grant of OAuth soon enough, will it be a distinction without a difference? Here's a revision that attempts to fix the former problem and also keep the original semantic, in case we need it. Changes *bolded*. The sentence in *bold red* could be removed if we think it's pointless now. "*claims_redirect_uri* OPTIONAL. The URI to which the client wishes the authorization server to direct the requesting party's user agent after completing its interaction. The URI MUST be absolute; MAY contain an application/x-www-form-urlencoded-formatted query parameter component that *the authorization server MUST retain when redirecting the requesting party back, whether or not it adds any other parameters*; and MUST NOT contain a fragment component. The authorization server SHOULD require all clients to register their redirection endpoint prior to utilizing the authorization endpoint (either using a static process or through RFC7591 or [OIDCDynClientReg]). *If the authorization server does require clients to register redirection endpoints, it MUST require clients using UMA grants to register claims redirection URIs distinct from clients using other OAuth grants.* *If a client has pre-registered a URI, then the URI it supplies here *MUST exactly match one of its pre-registered claims redirection URIs, with the matching performed as described in Section 6.2.1 of RFC3986 (Simple String Comparison)." Discussion and comment welcome, especially prior to next Friday's call so that we can take care of this issue expeditiously. Thanks! *Eve Maler*Cell +1 425.345.6756 | Skype: xmlgrrl | Twitter: @xmlgrrl

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New spec and graphical representations
by Eve Maler 16 Oct '16

16 Oct '16

Hi folks-- A bunch of things to share with you today for your review. - Domenico has developed some revisions of the diagrams and flowcharts he's been working on, and they're attached here. - Here is a link to a new swimlane <http://www.websequencediagrams.com/files/render?link=Pu0sP0Oe2kjKc2WgdKZd> I just created. It will update as I revise it; it's meant to capture our current draft 2.0 flows, and to mark "SYNTAX CHANGES" and "ADDED OPTIONS". Dom's flowchart is meant to be a higher-level version of the swimlane, so we can decide what we'd like to put in the spec around the notion of an authorization interface and authorization process (conceptual? very technical?). - Finally, draft 05 <https://docs.kantarainitiative.org/uma/ed/uma-core-2.0-05.html> is up! Everything interesting (and some boring stuff) is in one commit <https://github.com/KantaraInitiative/wg-uma/commit/a973ea594169a359133cddf7…> . - Don't forget about George's deck <http://www.slideshare.net/CloudIDSummit/cis-2015-user-managed-access> for IIW as well! I'll try and review that in the next couple of days. Please review and comment! And please don't forget about the email threads already begun. :-) Talk to y'all Friday. *Eve Maler*Cell +1 425.345.6756 | Skype: xmlgrrl | Twitter: @xmlgrrl

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Notes from UMA legal telecon 2016-10-14
by Eve Maler 14 Oct '16

14 Oct '16

http://kantarainitiative.org/confluence/display/uma/UMA+legal+subgroup+note… 2016-10-14 - Working session on User-Managed Access (UMA) in Contractual and Regulatory Contexts <https://docs.google.com/a/wunderlich.ca/document/d/1HGM5-PoJFMnepyrTX91hqHK…> - Working through use cases per party in the transaction – see last week's notes for the pattern Attending: Eve, John W, Adrian, Kathleen, Mark, Mary, Sal Adrian points to this fascinating article introducing the notion of an "information fiduciary <http://www.theatlantic.com/technology/archive/2016/10/information-fiduciary…>". We discussed the merits of this phrase vs. "agent"; in the past, we've had feedback that "agent" is an accurate legal concept, but too academic. Mark concurs. Some give feedback that "fiduciary" may be helpful has a concept. It does have a connotation of totality of trust. This is sitting pretty well with quite a few use cases. What if our model text, if adopted as a whole by an ecosystem, would confer a kind of "safe harbor" (see the reference to this concept in the article) that lets the various service roles declare that they are "fiduciaries" of specific kinds on behalf of the resource owner/Resource Subject. At the least, we could advocate for this to be a standard interpretation among the Pan-Canadian Trust Framework developers, the GDPR regulators, etc. We're thinking that the budget we have available to use – and must be used by end of year – would best be used in a completion of this analysis. In fact, do we want to take BCRs and turn them into our text, or go in the other direction, or what? We have defined *Resource Subject* with our eyes open to the analogy with Data Subject. Does it make sense to have *Resource Controller* instead of Resource Server Operator? This seems relatively close, by analogy to Data Controller. But then again, from a rights-granting perspective (where the DS is the rights-holder on whatever basis and the DC works under constraints set by the DS) and what we've done with the design of UMA, we have perhaps split out the Data Controller role into two with our RS and AS. This is part of the innovation of UMA. And then what about *Resource Processor*, analogously to Data Processor, for the Client Operator? Is disclosure of data always for some purpose that is "on the DS's behalf", or is it sometimes for the autonomous use of the access recipient? Eve wonders if the "behalf" distinction is just a way of saying that liability, or responsibility, or accountability, is really strong or has a lot of components to it. As long as the regulatory/contractual layer above the technical UMA layer can capture the subtleties of the liability (such as "you can only share this data after a certain time") or even the technical layer can capture some constraints (such as "sharing will end at this time" or "you cannot write data back to the server, only read it from the server"), then the entire requesting side – both client and requesting party (however each ultimately get split out in "party" terms) – could constitute the Data Processor. What about the challenge of "on-sharing", or re-sharing, or downstream sharing constraints? Here are some thoughts: - If there is a narrow ecosystem where all users are using the *same* AS, it's very easy to manage this, because the (singular) AS can keep track, and then you (the RS that publishes APIs) could theoretically invent something like a "no re-sharing" scope on your APIs and then let people set this when they share. (Think of Google Apps's similar "Advanced" feature.) Such a scope, if that's the right place to put it, maybe could be a standard "best practice" scope in various APIs. - In a medium or wide ecosystem, where everyone uses (say) a different AS, John points out that Alice could at least monitor sharing through a ledger mechanism (he can send the diagram to the group), but you'd need something like encryption or DRM technology above UMA to actually control the re-sharing. John mentions J-LINC and Sal mentions COALA <http://coala.global/working-groups/>. *AI:* Eve: If feasible, approach Scott D about the possibility of more focused work to complete our use cases and terminology and analysis around DS/DP/DC. *Eve Maler*Cell +1 425.345.6756 | Skype: xmlgrrl | Twitter: @xmlgrrl

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Options for declaring the requesting party claims endpoint
by Eve Maler 14 Oct '16

14 Oct '16

Regarding the three options for declaring the requesting party claims endpoint that we discussed today: 1. Keep static declaration of requesting party claims endpoint in config data document and don't add to AS need_info response to client (status quo) 2. Keep static declaration and ADD to AS response 3. DROP static declaration and ADD to AS response Would static declarations be the only way to have a pattern of Bob authorizing claim-pushing ahead of time (a la AATs)? That may be a good rationale for keeping them, because they'd give feature parity with original UMA. And we already identified a rationale (or several) for dynamically adding the endpoint to the AS response. Does this argue for option 1? *Eve Maler*Cell +1 425.345.6756 | Skype: xmlgrrl | Twitter: @xmlgrrl

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Agenda for UMA legal telecon 2016-10-14
by Eve Maler 13 Oct '16

13 Oct '16

http://kantarainitiative.org/confluence/display/uma/UMA+legal+subgroup+note… 2016-10-14 - Working session on User-Managed Access (UMA) in Contractual and Regulatory Contexts <https://docs.google.com/a/wunderlich.ca/document/d/1HGM5-PoJFMnepyrTX91hqHK…> - Working through use cases per party in the transaction – see last week's notes for the pattern *Eve Maler*Cell +1 425.345.6756 | Skype: xmlgrrl | Twitter: @xmlgrrl

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Draft minutes of UMA telecon 2016-10-13 (meeting is on FRIDAY next week)
by Eve Maler 13 Oct '16

13 Oct '16

http://kantarainitiative.org/confluence/display/uma/UMA+telecon+2016-10-13 MinutesRoll call Quorum was reached. Logistics REMINDER: The call for *NEXT WEEK *will be held *Fri Oct 21* instead of *Thu Oct 20*, just after the Legal subgroup call. IIW WEEK: Move to Friday? *NO*: We will cancel the *Thu Oct 27 call* that would have been during IIW. Approve minutes Approve minutes of UMA telecon 2016-10-06 <http://kantarainitiative.org/confluence/display/uma/UMA+telecon+2016-10-06> : APPROVED by acclamation. Work on UMA.next issues Sec Considerations: 7.1 and 7.3 do seem somewhat related, and could usefully be put closer together and conceptually brought closer together somehow. Also, there's a typo in 7.3: Needs to be "authentication and *user mapping* capabilities". Sec Considerations: 7.2 talks about two different OIDC topics. The first paragraph is about one topic ("RECOMMENDED for the authorization server to use OpenID Connect, and to use its mechanisms for stronger client authentication at the token endpoint, in order to strengthen the authentication of OAuth clients."). The second paragraph is about end-user identification; we should break it out. In error_details, Justin's MPD work doesn't have a redirect_user Boolean; rather it has a dynamically provided URL for where the client should redirect the RqP to. Putting this information in the response could mitigate a discovery document attack, according to some in the OIDC – this attack is the basis for the AS mixup attack. On the other hand, a client registering a callback is a case of using static-ness on the other side to mitigate attacks. Another (potential?) benefit is that the AS could bind state to the URL, making it different every time. The static declaration does make it possible to proactive send the end-user RqP to an interaction with the AS, though the spec doesn't explicitly remind people that it's possible the way it explicitly reminds people that it's possible to proactively push claims to the RPT (now token) endpoint. Options: 1. Keep static declaration of requesting party claims endpoint in config data document and don't add to AS need_info response to client (status quo) 2. Keep static declaration and ADD to AS response 3. DROP static declaration and ADD to AS response *Decide next time on which option to choose.* Regarding 3.2.4: What is the expectation about the AS providing more information about the exact resource set IDs or scopes that were at fault? Would it be a good idea to provide more guidance around error descriptions that could accompany UMA errors? Development time and deployment time are different things; would end-users see these errors? Instructions: - Address Sec 7.1 and 7.3 comments above. Will take some thought. - Address Sec 7.2 comments above. - Make an ISSUE around analyzing the spec for what its effective "operational modes" are. Look for all MAYs and natural dividing lines, and be sure to document a rationale for every MAY if possible. - Change title that has "Consent" in it to "Authorization" - Sec 3.2.4: Should be "Any one of the provided resource set identifier *s*". Attendees As of 3 Oct 2016, quorum is 6 of 11. (Domenico, Sal, Nagesh, Andi, Robert, Maciej, Eve, Jeffrey, Mike, Cigdem, Sarah) 1. Domenico 2. Sal 3. Robert 4. Eve 5. Cigdem - researcher - new to the call! 6. Sarah Non-voting participants: - Adrian - Andrew - George - James - Scott F - Jin - Justin - Ishan Regrets: - Andi - Mike *Eve Maler*Cell +1 425.345.6756 | Skype: xmlgrrl | Twitter: @xmlgrrl

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UMA presentation at IIW
by George Fletcher 13 Oct '16

13 Oct '16

Hi, Here is the deck I plan to use to talk about UMA at IIW the week of 10/24. Any feedback gladly accepted:) http://www.slideshare.net/CloudIDSummit/cis-2015-user-managed-access Thanks, George -- Distinguished Engineer Identity Services Engineering, AOL Inc. Mobile:+1-703-462-3494 Office:+1-703-265-2544

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UMA Core editors' draft 04 is up
by Eve Maler 13 Oct '16

13 Oct '16

Sorry for the tardiness; it's been a long few days! https://docs.kantarainitiative.org/uma/ed/uma-core-2.0-04.html Diff set is here (everything dated Oct 12); sorry, I don't know how to tag stuff in a non-master branch... https://github.com/KantaraInitiative/wg-uma/commits/04-edits Got to more stuff than I thought I would, but less than I strictly hoped. Lots of good stuff to discuss tomorrow. Please do take a quick review. Things to note especially: - Code examples and ASCII diagram now have proper line breaks, and I even caught/fixed a JSON bug through this tool <https://jsonformatter.curiousconcept.com>. - All the stuff we discussed last week <http://kantarainitiative.org/confluence/display/uma/UMA+telecon+2016-10-06> is addressed in some fashion. - How an RS registers for a permission ticket and asks for multiple resource sets is in there <https://docs.kantarainitiative.org/uma/ed/uma-core-2.0-03.html#rfc.section.…> Talk tomorrow... *Eve Maler*Cell +1 425.345.6756 | Skype: xmlgrrl | Twitter: @xmlgrrl

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Agenda for UMA telecon 2016-10-13
by Eve Maler 12 Oct '16

12 Oct '16

http://kantarainitiative.org/confluence/display/uma/UMA+telecon+2016-10-13 Date and Time - *Thursdays,* 9-10am PT - Skype: +99051000000481 / US +1-805-309-2350 / international lines <https://www.turbobridge.com/join.html> / web calling interface <https://panel.turbobridge.com/webcall/> / code 1782540 - Screen sharing: http://join.me/findthomas - NOTE: do not use the join.me dial-in line - UMA calendar: http://kantarainitiative.org/confluence/display/uma/Calendar Agenda - Roll call - Logistics for upcoming meetings - Next week: moved to Friday - Week after: should we move to Friday given that it's IIW week? - Approve minutes of UMA telecon 2016-10-06 <http://kantarainitiative.org/confluence/display/uma/UMA+telecon+2016-10-06> - Work on UMA.next issues - See last week's notes - Core should be up to 04 shortly - Review Domenico's diagrams and the UMA grant flow options - RSR is up to 00 <https://docs.kantarainitiative.org/uma/ed/oauth-resource-reg-2.0-00.html> - New input simplification of the protection API - FB page <https://www.facebook.com/UserManagedAccess/> care and feeding ideas (if time) - AOB *Eve Maler*Cell +1 425.345.6756 | Skype: xmlgrrl | Twitter: @xmlgrrl

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