//
// The returned boolean is true iff the DN is found under one of the LDAP
// subtrees listed in `baseDNList`.
func (l *Config) GetValidatedDNUnderBaseDN(conn *ldap.Conn, dn string, baseDNList []xldap.BaseDNInfo) (string, bool, error) {
	if len(baseDNList) == 0 {
		return "", false, errors.New("no Base DNs given")
	}

	// Check that DN exists in the LDAP directory.