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Prerequisites

You have followed the instruction of "Install Shibboleth Service Provider(SP) 3.x on Windows and IIS" and configured the site with Cornell IDP.

Configuration

Weill Medical has its own Identity Provider with entityID "https://login.weill.cornell.edu/idp".

Open shibboleth2.xml, add Weill Medical IDP's metadata resolver inside <ApplicationDefaults .. > block

 <MetadataProvider type="XML" validate="true"
                url="https://login.weill.cornell.edu/idp/saml2/idp/metadata.php"
               backingFilePath="weill-idp.xml" maxRefreshDelay="7200" />

In shibboleth2.xml, find <SSO ..> tag which is inside <Sessions> block and replace it with:

<SSO discoveryProtocol="SAMLDS"  discoveryURL="https://shibtest.cit.cornell.edu/login.aspx">SAML2</SSO>

login.aspx is a login page you need to build(see below). You can name it what ever you like and host it on the same server or different server. In this example, we name it login.aspx and store it at root of the site https://shibtest.cit.cornell.edu. Make sure your login page doesn't require authentication.

Set up login page that allow user to choose "Cornell NetID" or "Weill Medical ID" to login. The design of the page is totally up to you. Here is an example:

Shibboleth at Cornell > Login with Cornell NetID and Weill Cornell CWID > Screen Shot 2019-07-18 at 2.43.21 PM.png

What's the url should I send user to after use choose the login type?

When user access your site that require authentication, user will be redirected to this login page. Here is the example of redirect url: https://shibtest.cit.cornell.edu/login.aspx?entityID=shibtestsites.cit.cornell.edu&return=https%3A%2F%2Fshibtest.security.cucloud.net%2FShibboleth.sso%2FLogin%3FSAMLDS%3D1%26target%3Dss%253Amem%253Abb98939caf6a03915ab8b6df13e6b5bb21f40bcec0319d0c8735bb5f91adba44

The redirect url contains a url parameter "return". Your login page need to get the value of the return parameter, then append the entityID of the corresponding IDP to that value. That forms the redirect url that you will send user to.

User Choose	Redirect user to url
Cornell NetID	The value of return parameter&entityID=https%3A%2F%2Fshibidp.cit.cornell.edu%2Fidp%2Fshibboleth
WeillMedical ID	The value of return parameter&entityID=https%3A%2F%2Flogin.weill.cornell.edu%2Fidp

Register your SP's metadata with InCommon. If you haven't submitted Shibboleth integration form yet, just mention your site also need to authenticate with Weill Medical IDP in the form. If you already submitted the form, send your request to idmgmt@cornell.edu. Please also mention your website url in the request. Once we receive your request, we'll register your SP's metadata with InCommon.