Using Zohocrm to authenticate users of a website

Using Zohocrm to authenticate users of a website

Does anyone know of a web CMS systems which interfaces with Zohocrm?  I am looking for a framework which uses the crm database to authenticate users i.e. to allow them to log-in to the website to reach restricted content.  I don't want to reinvent the wheel as I am sure someone must have done this already.