I've a situation,
- External Site : This site has its own user store (user/password) to log-in to.
- SharePoint WebPart : This webpart will get some readonly data from External Site but for performing any CURD operation on the External Site the user has to Log-in to External Site using IFrame Mechanism (This login form has to be of External site, and
UserName/Passwordd should be posted to login-form of External site) sharepoint shouldn't be collecting any user/password credentials. (how can we do this?)
How user gets authenticated in External Site:
1. user Provides username/password.
2. Once authenticated to User Store it set an Authentication Cookie in use browser, thus uses this cookie with every request to perform any CURD operation.
I've to have the similar functionality in SharePoint Webpart. using IFRAME.
Hope i covered all the points in my explaination, if you can provide any blog/code which is dealing with similar kind of approach.
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