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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">One of our primary use cases using the gateway option is a personal portal landing page, my.umt.edu. It paints one way for anonymous users, or is customized
for authenticated employees or students, respectively. For session users, the CAS server responds with a ticket, and then the client requests ticket validation which gets a response containing the usual attribute release.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">If the IdP simply redirects to the service for both session and non-session scenarios, I am confused why the gateway option would be present at all.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">For our purposes, the CAS gateway option is the CAS client’s solution to what I understand the ‘passive authentication’ option to be for the Shibboleth NativeSP.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I have discussed the options for re-developing our existing CAS gateway endpoints to use the NativeSP with passive authentication but they are resistant, I think
because they have gotten a little carried away with the PHP-CAS clients using the gateway option. That’s not a knock on them, but just to explain their current angst.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Anything you can do to help us figure out an IdP solution is going to work, as we are now fully dedicated to Shibboleth IdP for SSO.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">-Josh<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<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"> users [mailto:users-bounces@shibboleth.net]
<b>On Behalf Of </b>Marvin Addison<br>
<b>Sent:</b> Thursday, February 4, 2016 5:58 PM<br>
<b>To:</b> Shib Users <users@shibboleth.net><br>
<b>Subject:</b> Re: IdP3 CAS gateway issues.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">For whatever reason, our CAS clients that are making requests with the gateway=true option for anonymous access, which work well with our CAS server, are not working with the IdP.<o:p></o:p></p>
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<p class="MsoNormal">There are two situations to consider in gateway mode:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">1. You have a valid IdP session<o:p></o:p></p>
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<p class="MsoNormal">2. You do NOT have a valid IdP session<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The CAS protocol [1] says a ticket MAY be returned in the first case; conversely, the ticket MUST NOT be returned in the second.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">My recollection is that I intended to _never_ grant a service ticket when a client requests gateway mode. That's likely different from what Jasig CAS does, but it's clearly allowed by the protocol spec.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The IdP is redirecting back to the service without painting a login view as expected, but the redirect does not have any parameters included, namely the ticket, if I already have
a session on the IdP.<o:p></o:p></p>
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<p class="MsoNormal">I'm open to changing the behavior, but I'd need to understand your use case better.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">M<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">[1] <a href="https://github.com/Jasig/cas/blob/4.1.x/cas-server-documentation/protocol/CAS-Protocol-Specification.md">https://github.com/Jasig/cas/blob/4.1.x/cas-server-documentation/protocol/CAS-Protocol-Specification.md</a> (the 2.0 spec
is MIA on the Web, but the relevant parts are unchanged in 3.0)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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