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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For info, It’s moodle, it sends &gateway=true to CAS(Shibboleth), I’ll try to strip it out before Shibboleth sees it.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-GB"> Duncan Brannen
<br>
<b>Sent:</b> 01 September 2021 14:18<br>
<b>To:</b> users@shibboleth.net<br>
<b>Subject:</b> IsPassive=true in AuthnRequest to Azure when no session exists<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi All,<o:p></o:p></p>
<p class="MsoNormal"> Not sure if anyone has come across this or can point me at a workaround.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We’ve recently upgraded to Shibboleth 4.1.4 and added in CAS support (retired our CAS servers) and setup proxy authentication to AzureAD. We’ve hit a few issues that were straight forward to resolve but the headscratcher at the moment
is moodle.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Moodle’s is configured to use CAS authentication. Taking a clean browser session and attempting to login to moodle results in a Silent sign in error from Azure (quite rightly, there is no session), returning to the moodle login page and
trying again gives a prompt as expected.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The issue seems to be that the first time around the IDP adds IsPassive=True to the Authn request which then fails but the 2<sup>nd</sup> attempt doesn’t add IsPassive=true and succeeds.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any thoughts / pointers appreciated. Can I set anything to override setting IsPassive on a resource by resource basis? It’s only the one CAS resource that’s going wrong, other AuthnRequests containing IsPassive=True succeed (When the
useris already logged in)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"> Duncan<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">DEBUG [net.shibboleth.idp.saml.saml2.profile.impl.AddAuthnRequest:238] - Profile Action AddAuthnRequest: Setting IsPassive for SAML AuthnRequest<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif"><?xml version="1.0" encoding="UTF-8"?><saml2p:AuthnRequest xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol" AssertionConsumerServiceURL="<a href="https://login.st-andrews.ac.uk/idp/profile/Authn/SAML2/POST/SSO%22" target="_blank" title="https://login.st-andrews.ac.uk/idp/profile/authn/saml2/post/sso%22">https://login.st-andrews.ac.uk/idp/profile/Authn/SAML2/POST/SSO"</a>
Destination="<a href="https://login.microsoftonline.com/...../saml2%22">https://login.microsoftonline.com/...../saml2"</a> ID="_bdb614add66efeef7f19aaa375ebf322" IsPassive="true" IssueInstant="2021-09-01T10:42:03.320Z" ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
Version="2.0"><br>
<saml2:Issuer xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><a href="https://idp.st-andrews.ac.uk/shibboleth%3c/saml2:Issuer%3e" target="_blank" title="https://idp.st-andrews.ac.uk/shibboleth</saml2:issuer>">https://idp.st-andrews.ac.uk/shibboleth</saml2:Issuer></a><br>
<saml2p:NameIDPolicy AllowCreate="true"/><br>
</saml2p:AuthnRequest><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif">^Above fails while below succeeds<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif"><?xml version="1.0" encoding="UTF-8"?><saml2p:AuthnRequest xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol" AssertionConsumerServiceURL="<a href="https://login.st-andrews.ac.uk/idp/profile/Authn/SAML2/POST/SSO%22" target="_blank" title="https://login.st-andrews.ac.uk/idp/profile/authn/saml2/post/sso%22">https://login.st-andrews.ac.uk/idp/profile/Authn/SAML2/POST/SSO"</a>
Destination="<a href="https://login.microsoftonline.com/...../saml2%22">https://login.microsoftonline.com/...../saml2"</a> ID="_ecf37f9d3e1bc7a662d02b200757a284" IssueInstant="2021-09-01T10:42:30.384Z" ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
Version="2.0"><br>
<saml2:Issuer xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><a href="https://idp.st-andrews.ac.uk/shibboleth%3c/saml2:Issuer%3e" target="_blank" title="https://idp.st-andrews.ac.uk/shibboleth</saml2:issuer>">https://idp.st-andrews.ac.uk/shibboleth</saml2:Issuer></a><br>
<saml2p:NameIDPolicy AllowCreate="true"/><br>
</saml2p:AuthnRequest><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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