Dynamic LDAP username & password

[Tom Barber]

Hello folks,

I don't know if this is possible in 4.x without extending it but I figured I'd ask.  

I'm implementing LDAP based CAS  on  a corporate AD server I have no administrative control over (as usual).

I wrote an Ldaptive  class to check the idea and it seems valid:

https://gist.github.com/buggtb/4084f76484c771dd1aca14570c932e24

But i was wondering if I could do similar in CAS without extending it. Basically  I want to do a search for myself after authenticating... as my self. 

Its basically a directbind but without knowing where in the tree I live,  so I authenticate and then find myself. 

So in the LDAP examples I wanted to know if I could do an Authenticated Search, but pass the username and password in from the users entry when they attempt to login?

Thanks

Tom