FYI - I'm posting this request to both GF Support and WPDirAuth (http://wordpress.org/plugins/wpdirauth/) as I'm not sure where to begin on this effort but I think will involve some coding related to both plugins.
The context to the question is that I am trying to connect WPDirAuth (for LDAP authentication) with a GF form that creates new users via the GF User Registration add-on. I haven't yet found a hook / filter in the GF add-on which would enable me to override their registration process, but also not sure what that modification process would be assuming it does exist.
Currently - If a new user goes to the standard wp-login.php page and puts in their valid LDAP credentials it will validate existing users or create a new WP Subscriber account. Ultimately I'm aiming to remove access to this screen and funnel user creation through the GF form and regular login/logout via shortcode or functions coming from the theme header.
The best-scenario is that user provides an email address in the form, but not password, and WPDirAuth would check if that is a valid LDAP email address and create a WP subscriber account without the password. When the user then next tries to login (providing their password) it will validate against LDAP. If there isn't a way to do that w/o password, same process with password capture and I can customize GF to remove the password from form info after completing user registration.
Any suggestions or code examples to help along this path would be greatly appreciated.