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<p class="MsoNormal"><span style="color:#1F497D">My suspicion was that this particular service provider was using Okta—this is now confirmed. In my experience,
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">some SP developers who use Okta have the impression that each SP must have its own distinct IDP metadata—the
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">metadata cannot be the same. I was able to disabuse one vendor of this misapprehension. However, the latest vendor<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">has designed an SP that somehow assigns a so-called OPID to the entityID of the IDP (not kidding!), instead of relying an
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">attribute such as eduPersonScopedAffiliation in the SAML response to the SP—or something sensible.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Scott Cantor’s response was very helpful, by the way. This is something I can send up the flagpole.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I guess he’s seen everything. I’m still capable of being nonplussed—not to mention flabbergasted.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">-F<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><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;color:windowtext">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"> users <users-bounces@shibboleth.net>
<b>On Behalf Of </b>Spencer Thomas via users<br>
<b>Sent:</b> Wednesday, December 21, 2022 5:27 PM<br>
<b>To:</b> Shib Users <users@shibboleth.net><br>
<b>Cc:</b> Spencer Thomas <Spencer.Thomas@ithaka.org><br>
<b>Subject:</b> Re: Education vendor SSO configuration requires separate IDP entityIDs for each SP!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">And when I said eduPersonEntitlement, I actually meant eduPersonScopedAffiliation.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">On 12/21/22, 2:12 PM, "users" <<a href="mailto:users-bounces@shibboleth.net">users-bounces@shibboleth.net</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">As a service provider, I can say that we have definitely engineered our SP to accommodate multiple institutions using the same EntityID.
We obviously require a different attribute, most typically eduPersonEntitlement, to distinguish between those institutions.
</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Spencer Thomas<br>
</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Technical Architect </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.ithaka.org_&d=DwMF-g&c=mRWFL96tuqj9V0Jjj4h40ddo0XsmttALwKjAEOCyUjY&r=w05DwAF0P7ofwV4XZt1zDuW3aSHj2h4ep8o8gzwYbJo&m=FUytUOszF6u1h8HnN-DI_Kv6s8vLU5eCFdhIJBFjVOa-Jxl0iyomlKsYqEnOpRmE&s=yA6pvruWzOEpvdkwsi93VD2ROpHBPWlwbuAGWtFbcaY&e="><span style="color:#0563C1">ITHAKA</span></a> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">301 E. Liberty St, Suite 250, Ann Arbor, MI 48104<br>
Email: <a href="mailto:Spencer.Thomas@ithaka.org"><span style="color:#0563C1">Spencer.Thomas@ithaka.org</span></a></span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Voicemail: +1-734-887-7004</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">On 12/21/22, 1:32 PM, "users" <<a href="mailto:users-bounces@shibboleth.net">users-bounces@shibboleth.net</a>> wrote:</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">Hi,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">I’m writing from the City University of New York. We’re attempting to enable SAML2 SSO with
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">a vendor who would configure a service provider instance for each of our 26 campuses—except
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">for one problem that I have never encountered in my years of configuring Shibboleth.
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">Their system will not accept the same IDP entity ID for two or more SPs. We have one SP instance
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">configured in their system (and in ours as a relying party) with our IDP metadata (we’re running IDP 4.0.1).
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">This integration works as expected. When they attempt to configure a new SP instance, their system
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">generates the error message, “Duplicate IDP Entity ID. Another IDP profile has the same Entity ID.”</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">Am I correct that this constraint on IDP and SP entityIDs is nonstandard?</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">In case I have made an unwarranted assumption about their system, the SAML2 specification or both, is there
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">a way to generate separate metadata for the same IDP with different entityIDs? One of their customers
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">(another university) provided the vendor with IDP metadata of the form entityID=constantURL?variableID=theID.
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">The ACS etc endpoints in their metadata also contained the additional argument. I do not know if this customer stood
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">up separate IDPs.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">I feel as though I ought to apologize for this.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">Sincerely,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3">Florian</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt;color:#98AFF3"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><img border="0" width="176" height="96" style="width:1.8333in;height:1.0in" id="Picture_x0020_3" src="cid:image004.png@01D91573.2E034990"></span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:9.0pt;color:#00B0F0">Florian Lengyel, PhD</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:9.0pt;color:#00B0F0">Identity and Access Management</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:9.0pt;color:#00B0F0">CUNY CIS 395 Hudson Street, New York, NY 10014</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:9.0pt;color:#00B0F0">Voicemail: (646) 664-2370 Cell: (917) 621-7845</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:9.0pt;color:#00B0F0">Email:
<a href="mailto:florian.lengyel@cuny.edu">florian.lengyel@cuny.edu</a></span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
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