Set ForceAuthn in metadata

[Lipscomb, Gary]

We have an SP (Banner ssoManager) who is sending ForceAuthn="false" in its AuthnRequest

<saml2p:AuthnRequest AssertionConsumerServiceURL="https://bdevel.csu.edu.au/ssomanager/saml/SSO"
                     Destination="https://idpdev.csu.edu.au/idp/profile/SAML2/Redirect/SSO"
                     ForceAuthn="false"
                     ID="a5233790846d79h03hc7h81j5ijf8jd"
                     IsPassive="false"
                     IssueInstant="2018-08-16T03:06:51.209Z"
                     ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
                     Version="2.0"
                     xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol" >
           <saml2:Issuer xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">ssomanager</saml2:Issuer>
</saml2p:AuthnRequest>

When a user logs out from the application they are redirected back to a page with a link back into the application. Since the SSO session is not killed and we can't customise that page to tell the user to close all windows and tabs for secure logout one of the workarounds the vendor suggests is to set ForceAuthn="true" in their version of the IdP (which we haven't installed).

Is it possible to set ForceAuthn="true" in the SP's metadata? Would this override the setting in the AuthnRequest?

Regards

Gary

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