Restrict User Connections Using Logon Trigger

Question

Hi all,
Now I am restricting user connections from selected terminals, using following logon trigger.
It allows users with DBA privileged user.
How to restrict DBA Privileged users users ?
Note:- As per my application needs DBA privilege.
CREATE OR REPLACE TRIGGER on_logon
AFTER LOGON
ON DATABASE
DECLARE
VPROGRAM VARCHAR2(30);
Vusername VARCHAR2(30);
VTERMINAL VARCHAR2(30);
CURSOR user_prog IS
SELECT UPPER(program),UPPER(username),NVL(TERMINAL,'X') FROM v$session
WHERE audsid=sys_context('USERENV','SESSIONID');
BEGIN
OPEN user_prog;
FETCH user_prog INTO Vprogram,Vusername,VTERMINAL;
IF VTERMINAL NOT IN ( 'APP1','APP2','APP3')+
and Vusername='ABUL'+
THEN
RAISE_APPLICATION_ERROR(-20001, 'You are not allowed to login');
END IF;
CLOSE user_prog;
END;
Thanks i Advance
Abk

Answer 1

Your application needs the DBA role? That is a terrible design-- it violates every principle of secure coding.
Login triggers don't fire for users with the DBA role, so you won't be able to use a login trigger here. You could ditch the login trigger and configure invited and excluded nodes in the listener's sqlnet.ora file, i.e.
tcp.validnode_checking = yes
tcp.excluded_nodes = (hostname1,hostname2,hostname3)You'll have to restart the listener after making that change.
Justin