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<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
Hi Scott,</div>
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Thanks for pointing me to the resources.</div>
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I did the checks as per your earlier email.</div>
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<br>
</div>
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What is confusing is that the partner whom we are sending an auth request maintains two IdPs. </div>
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Both require that the auth requests be signed. So the 'WantAuthnRequestsSigned="true"' parameter is set in the IdP metadata from both the IdPs.</div>
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<br>
</div>
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Now when the Shib SP is sending the request from our end in one case it is not embedding the certificate(case1 below) while in the other case it is(case 2 below). The configurations are identical on our end for both the IdPs. The IdP is not expecting the embedded
certificate. </div>
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<br>
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Any pointers would be highly appreciated.</div>
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<br>
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<br>
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Case 1 auth request:</div>
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<samlp:AuthnRequest xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"</div>
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AssertionConsumerServiceURL="https://target.application.domain/Shibboleth.sso/SAML2/POST"</div>
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Destination="https://partner.idp.endpoint/saml20/login"</div>
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ID="_f761612e0577dd486d9a63277328b59a"</div>
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IssueInstant="2024-07-19T15:35:21Z"</div>
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ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"</div>
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Version="2.0"</div>
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></div>
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<saml:Issuer xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">https://target.application.domain/</saml:Issuer></div>
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<samlp:NameIDPolicy AllowCreate="1" /></div>
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</samlp:AuthnRequest></div>
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<br>
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<br>
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Case 2 auth request:</div>
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<br>
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<samlp:AuthnRequest xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"</div>
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AssertionConsumerServiceURL="https://target.application.domain/Shibboleth.sso/SAML2/POST"</div>
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Destination="https://partner.idp.endpoint/saml20/login"</div>
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ID="_f761612e0577dd486d9a63277328b59a"</div>
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IssueInstant="2024-07-19T15:35:21Z"</div>
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ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"</div>
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Version="2.0"</div>
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></div>
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<saml:Issuer xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">https://target.application.domain/</saml:Issuer></div>
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<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"></div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<ds:SignedInfo></div>
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<ds:CanonicalizationMethod Algorithm="****algorithm*****" /></div>
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<ds:SignatureMethod Algorithm="****algorithm*****" /></div>
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<ds:Reference URI="resource URI"></div>
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<ds:Transforms></div>
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<ds:Transform Algorithm="****algorithm*****" /></div>
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<ds:Transform Algorithm="****algorithm*****" /></div>
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</ds:Transforms></div>
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<ds:DigestMethod Algorithm="****algorithm*****" /></div>
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<ds:DigestValue>****digest value****</ds:DigestValue></div>
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</ds:Reference></div>
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</ds:SignedInfo></div>
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<ds:SignatureValue>***signature value***</ds:SignatureValue></div>
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<ds:KeyInfo></div>
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<ds:KeyName>**key name**</ds:KeyName></div>
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<ds:KeyName>**key name**</ds:KeyName></div>
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<ds:X509Data></div>
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<ds:X509SubjectName>****subject name ******</ds:X509SubjectName></div>
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<ds:X509Certificate> **** certificate string*****</div>
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</ds:X509Certificate></div>
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</ds:X509Data></div>
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</ds:KeyInfo></div>
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</ds:Signature></div>
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<samlp:NameIDPolicy AllowCreate="1" /></div>
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</samlp:AuthnRequest></div>
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<div style="font-family: garamond, serif; font-size: 15px; color: rgb(36, 36, 36);">
<span style="background-color: rgb(255, 255, 255);">Thanks and Regards,</span></div>
<div style="font-family: arial, sans-serif; font-size: 15px; color: rgb(34, 34, 34);">
<span style="background-color: rgb(255, 255, 255);"><b><br>
</b></span></div>
<span style="font-family: arial, sans-serif; font-size: 15px; color: rgb(34, 34, 34); background-color: rgb(255, 255, 255);"><b>Amit Dongaonkar</b><br>
</span>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Cantor, Scott <cantor.2@osu.edu><br>
<b>Sent:</b> Friday, July 19, 2024 12:32 PM<br>
<b>To:</b> Amit Dongaonkar <amitd@nitssolutions.com>; Shib Users <users@shibboleth.net><br>
<b>Subject:</b> Re: Signature tag in assertion request</font>
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<br>
> Hi Scott, Thats what I suspected too. However, this<br>
> parameter is set to true on other IdP metadata files too .<br>
<br>
The SP is only going to sign in two cases:<br>
<br>
- that flag<br>
- you tell it to sign<br>
<br>
Setting the SP option to false will also forcibly disable the signing regardless.<br>
<br>
<a href="https://shibboleth.atlassian.net/wiki/spaces/SP3/pages/2065334379/SigningEncryption#Transport-Authentication">https://shibboleth.atlassian.net/wiki/spaces/SP3/pages/2065334379/SigningEncryption#Transport-Authentication</a><br>
<br>
-- Scott<br>
<br>
<br>
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