Exploring the compatibility between ADFS 2.0 and JSONP

My main website uses passive federation (ADFS 2.0) and includes javascript that communicates with an MVC Web API site using jsonp.

I am facing a challenge in getting this WebAPI to support Single Sign On on the same machine but different port. The passive redirects are causing issues with the jsonp requests, as the STS returns its own script instead of redirecting to the actual URL for the response script.

I am wondering if passive federation is compatible with a jsonp webapi. If not, how can I implement Active Federation without requiring username/password credentials? Since users are already authenticated via the main website before accessing the webapi, how can I leverage their existing login status within the webapi?

javascriptajaxjsonpadfs2.0adfs

Answer №1

In this particular situation, the passive federation protocol will not be effective.

There are two possible solutions:

  • If your web API is primarily utilized by your website, you can share the cookie generated by WIF upon user authentication. To achieve this, ensure that different websites configure the <cookieHandler> section in WIF configuration to utilize the same domain and path, using a Fully Qualified Domain Name (FQDN) instead of machine names. This allows the browser to recognize both the website and the API as part of the same domain.

  • Another option is to set up the Web API to extract and authenticate SAML tokens generated during the authentication process. In this case, save the token used for authentication by enabling the saveBootstrapToken setting in the <service> element of the WIF configuration. Retrieve the token using the claimsIdentity.GetBootrapToken() extension method, then attach it as an HTTP header in JavaScript calls like "Authorization: bearer ...the-token....". On the server side, validate the token programmatically. Keep in mind that there may be limitations in IIS due to header length if the token is excessively large.

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