Is there way to log in user using GET or POST parameters?

[devespo]

I have a use case where user enters login information in a different form (self made) and certain external actions take place (including api call to make sure username and pass entered is correct). After this I want to redirect user to https://myespoinstall/?username=user&password=pass or do the same by submitting a form. Is this possible? I'm trying to accomplish something similar to single signon.