if err = l.LDAP.LookupBind(conn); err != nil {
		return "", err
	}

	// Check if the passed in username is a valid DN.
	if !l.ParsesAsDN(username) {
		// We consider it as a login username and attempt to check it exists in
		// the directory.
		bindDN, err := l.LDAP.LookupUserDN(conn, username)
		if err != nil {
			if strings.Contains(err.Error(), "User DN not found for") {
				return "", nil
			}

	flag.StringVar(&ldapUsername, "u", "", "AD/LDAP Username")
	flag.StringVar(&ldapPassword, "p", "", "AD/LDAP Password")
	flag.BoolVar(&displayCreds, "d", false, "Only show generated credentials")
	flag.DurationVar(&expiryDuration, "e", 0, "Request a duration of validity for the generated credential")
	flag.StringVar(&bucketToList, "b", "", "Bucket to list (defaults to ldap username)")