Denying unwanted access for a user to a database

Hi,
Is there a mechanism in Oracle using which we can deny access to a user based on invalid login attempts made ? For example, in case a user logs in for the first time with an incorrect password, does the same the second time also, so at his third attempt, can we block the user and prevent login for say 24 hours ?
Thanks and Regards,
Mohan.

Although I have not addressed this issue myself, it seems that it would be possible to setup this functionality yourself.
1) Make sure you have auditing turned on.
2) Create a logon trigger that searches audit logs for user from the terminal you are interested in and raises an application error if there as been 3 or more failed "create session" attempts in the last 24 hours.
Regards
Tim Boles
Well this was fun....I am not sure it is "full proof" but I had fun trying to figure it out...took a little bit of researching on google and through the Oracle documents but hey you can tailor it to your needs.
Turn auditing on
Update your initialization file to have audit_trail=true
bounce the database
As sysdba
SQL>audit create session;
SQL>
create or replace trigger logon_time after logon on database
declare numfailed number;
begin
select count(1)
into numfailed
from dba_audit_trail
where ACTION_NAME='LOGON'
and RETURNCODE=1017
and USERHOST=(select sys_context('USERENV','HOST') FROM DUAL)
AND USERNAME=(select sys_context('USERENV','SESSION_USER') FROM DUAL)
and timestamp>trunc(sysdate);
if numfailed > 2
then
RAISE_APPLICATION_ERROR(-20001,'Not Allowed to Logon Database failed 3 times within 24 hours');
end if;
end;
SQL>connect scott/scotttest
Connected.
SQL>connect scott/asfasdf
ERROR:
ORA-01017: invalid username/password; logon denied
Warning: You are no longer connected to ORACLE.
SQL>connect scott/asfasdf
ERROR:
ORA-01017: invalid username/password; logon denied
Warning: You are no longer connected to ORACLE.
SQL>connect scott/asfasdf
ERROR:
ORA-01017: invalid username/password; logon denied
Warning: You are no longer connected to ORACLE.
SQL>connect scott/scotttest
ERROR:
ORA-00604: error occurred at recursive SQL level 1
ORA-20001: Not Allowed to Logon Database failed 3 times within 24 hours
ORA-06512: at line 13
Edited by: Tim Boles on Apr 13, 2010 9:52 AM

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