8steb (8steb) asked a question.
I notice the SAMLResponses Okta POSTs to our app, always have the same Issuer (<saml2:Issuer ... ), regardless of which was the original IdP where the user authenticated.
Is there a way to figure out the original IdP from a SAMLResponse we receive?
we need to be able to distinguish which was the original IdP as our application supports multiple IdP associated to different users.
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We use cookies to provide the best website experience and to help understand marketing efforts. We may also share data with ad partners to reach potential customers across the web. To learn more, visit our Privacy Policy. Click here for Your Privacy Choices. You may also opt out of this sharing by signaling your preference via GPC, applicable only to the browser signaling the opt-out.
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These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
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I'm not trying to identify the application though. My Application supports multiple IdPs, because different users use different IdPs, for the same Application.
Okta proxies to all those IdPs, so to our app there's 1 SAML IdP, Okta's. That's very helpful because then we only need to verify signature against Okta's public certificate.
But we need to verify user (NameID) matches the original IdP (otherwise a rogue IdP could be lying about having a user that exists in another IdP).Our app receives (in a POST) Okta's SAMLResponse that has Okta's Issuer ID (which is the same regardless of the user's used IdP), and nothing else in the SAMLResponse seems to allow identifying which was the original IdP where the user logged in.
For example, If there were a way for Okta to give us the original IdP Issuer (or any other Id we can set) in the RelayState (or any extra attribute in the SAML assertion we receive) it would be enough. Is there any way to ask Okta to forward us data from the original IdP SAMLResponse (like Issuer/IdP ID)?