we have a request from a client to add some type of password validation to one of their info path forms. This means that before the user could submit the form they would somehow be prompted for their share-point username and password. I think we can build a custom web service to accomplish this but I was wondering if anyone has done something like this before or has any ideas. We know how we want to handle the user interaction on the info-path side but the uncertainty comes from how to validate the users credentials. We would like to avoid code behind if possible but if that is the best way we can consider it.
Thanks in advance.