Ldap authenticate group members

Hi,

We are planning to construct ldap Domain strucure as

Ou=Users,dc=mycompany,dc=com and another organizational unit Groups and Cn groups Staff and Customers in it. Added some of users from Ou=Users to member of Staffs and Customers. Now i want only the guys who are member of Staffs group should authenticate from a patricular application . How can i achive it?

thanks,

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