integration with Active Directory

I want to build a form that displays some data about users, cause users data are existing in active directory like names and phone numbers, we only need to collect the required lms extra data so, the expected form will be like that:
user will have two text fields write username & password then click next,
If existing in active directory, then complete the remaining data and get any required personal details from active directory.

/// On administration area, the admin can see all details, as you will collect information from user side and active directory side, then save it on Drupal DBase.
So, expecting behavior on administration part has no difference from the current achieved.