My client is insistent that there be a single page where both Joomla administrators and users can log in, as opposed to the default Joomla setup where these two groups log in in separate locations (/administrator for the admin). While the reasons for the client's insistence are besides the point, essentially it's a small group where only some users can do CMS type management of articles etc., but they don't want to have to go to separate pages, go figure.
Anyway, is there some sort of extension for this, or would I have to write an authentication plugin to handle? Could the controller for one type of login call the other login and pass through the same credentials, and if so how would that be put into code?