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iOS authentication

So i'm trying to set up an ipad application to allow users to authenticate on our portal site. I've spent a ton of time researching and making different attempts but I always come to the same scenario. Either the user has to have a security token passed in with the username/password or the ipad app has to display an external salesforce page in a browser to get a token. Does anyone know of a way to authenticate a portal user with ONLY a username/password and without being redirected off the main application?