How to bind and query LDAP server without specifying user credentials

Currently my Mac has been successfully configured to be in Active Directory Domain. (System Preferences -> Users & Groups -> Login Options -> Network Account Server)

We are developing a Mac application that has following requirements:

1. It should communicate with the LDAP server in Active Directory Domain and retrieve users & their attributes from LDAP server.
2. While communicating (bind or search) with the LDAP server, we are not allowed to explicitly specify logged-in user's credentials. (e.g. we should not prompt username / password screen to the user)
   

If we explicitly specify logged-in user's credentials,

• we are able to bind to the LDAP server
• we are able to search the users & their attributes in LDAP server.
  

If we do not specify logged-in user's credentials,

• we are able to bind to the LDAP server,
• but it does not allow us to search the users & their attributes in LDAP server.
  

Is there a way with which we can use logged-in user's credentials implicitly while communicating with the LDAP server?

Can you please guide us how we can query LDAP server (search users & their attributes in LDAP server) without specifying logged-in user's credentials explicitly.

Any kind of help is highly appreciable.

Thanks