Access DB through firewall

A system located in head office, this system consists of oracle database and oracle forms, there is some users on database are default users and their passwords cannot be changed.
This system is connected to branches; the local network is connected to a firewall which is connected to a router to the branches.
Now some employees on branches knows the password of the default users which has special permissions on database.
The question is : can we let the employees on branches open the oracle forms and connect to database and restrict them to a new user we create for them on DB and disallow them to access the data base using one of the default users using the firewall?

Thanks,
oamal2001Asked:
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sdstuberCommented:
In a logon trigger you can check if the user is coming from a particular ip  address (the firewall) or not and then either allow them through or return an error.

That might look something like this...

CREATE OR REPLACE TRIGGER trg_deny_remote_default
    AFTER LOGON
    ON DATABASE
BEGIN
    IF USER = 'DEFAULT_USER'
   AND SYS_CONTEXT('userenv', 'ip_address') NOT IN ('123.123.123.123',
                                                    '123.123.123.124',
                                                    '123.123.123.125',
                                                    '123.123.123.126')
    THEN
        RAISE_APPLICATION_ERROR(-20001, 'Default user must login from local address');
    END IF;
END;
/

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Adjust the ip lookup rule to whatever is appropriate for your system.

Perhaps something with a LIKE clause to check ranges (white list)

 AND SYS_CONTEXT('userenv', 'ip_address')  LIKE '123.123.123.%'

or a NOT condition (black list)

AND SYS_CONTEXT('userenv', 'ip_address')  NOT LIKE '123.123.123.%'
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