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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Maybe the point we are talking past each other is that in front channel ONE client_id can have several redirect_uris which
 lead to different subs when NO sector_identifier_uri is defined while in back channel there are no redirect_uris and there is always a sector_identifier_uri?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">So in OIDC (front channel) one legal entity can have one backend server and several mobile apps and in the redirect all
 apps use the same client_id but different redirect_uris which leads to different subs if no siu is defined and to the same sub if a siu is defined.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Although I wonder why one legal entity might want different subs anyway…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">And in OIDC one legal entity which has multiple clients with different client_ids would define a sector_identifier_uri
 to get the same sub for all clients.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">In CIBA the same legal entity with multiple client_ids needs to define a siu to get the same sub or different sius (one
 for each client_id) if they want different subs.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Although none of this has anything to do with validation of meta-data nor with jwks_uris…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">//Axel<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Openid-specs-mobile-profile [mailto:openid-specs-mobile-profile-bounces@lists.openid.net]
<b>On Behalf Of </b>Nennker, Axel<br>
<b>Sent:</b> Mittwoch, 14. Juni 2017 09:52<br>
<b>To:</b> James.H.Manger@team.telstra.com; ve7jtb@ve7jtb.com<br>
<b>Cc:</b> openid-specs-mobile-profile@lists.openid.net<br>
<b>Subject:</b> Re: [Openid-specs-mobile-profile] Issue 52 CIBA Pairwise Identifiers Structuring Text<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">inline<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Manger, James [</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a href="mailto:James.H.Manger@team.telstra.com"><span lang="DE">mailto:James.H.Manger@team.telstra.com</span></a></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">]
<br>
<b>Sent:</b> Mittwoch, 14. </span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Juni 2017 06:29<br>
<b>To:</b> Nennker, Axel <<a href="mailto:Axel.Nennker@telekom.de">Axel.Nennker@telekom.de</a>>;
<a href="mailto:ve7jtb@ve7jtb.com">ve7jtb@ve7jtb.com</a><br>
<b>Cc:</b> <a href="mailto:openid-specs-mobile-profile@lists.openid.net">openid-specs-mobile-profile@lists.openid.net</a><br>
<b>Subject:</b> RE: [Openid-specs-mobile-profile] Issue 52 CIBA Pairwise Identifiers Structuring Text<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Axel,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">> What are the threats if all client metadata is validated at registration time and all CIBA requests are authenticated?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:53.4pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">BadClient is not able to register for the same sector_identifier_uri as GoodPollingClient (regardless of CIBA
 or OIDC) This is nothing bad introduced by CIBA.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">This is your mistake.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Multiple clients can register the same sector_identifier_uri — that is the whole point of the sector_id concept (grouping
 multiple apps). The issue is how does the registration system distinguish BadClient from OtherGoodPollingClient when both register the same sector_id?<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I understand that point. That is the whole purpose of sector_identifier_uri.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">The current Discovery spec does not go into details on validation.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">The OIDC spec, too, does not go into detail how the validation is done.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">There is nothing that is CIBA specific about validation.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">--<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">James Manger<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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