configure complex password (password verify function) in oracle database

 configure password verify function in oracle database

We can enable the oracle provided "password verify function" to enforce strong password restrictions for our DB users. This function with other profile parameters can create a strong security for the database.To enable the oracle password verification function you need to execute the utlpwdmg.sql file from ORACLE_HOME/rdbms/admin as sysdba.


[oracle@Linux03 home]$ cd /u01/app/oracle/product/12.1.0.2/db_1/rdbms/admin/
[oracle@Linux03 admin]$ ls utlpwdmg.sql

[oracle@Linux03 admin]$ sqlplus / as sysdba
SQL> @/u01/app/oracle/product/12.1.0.2/db_1/rdbms/admin/utlpwdmg.sql

SQL> @/u01/app/oracle/product/12.1.0.2/db_1/rdbms/admin/utlpwdmg.sql

Function created.

Grant succeeded.

Function created.

Grant succeeded.

Function created.

Grant succeeded.

Profile altered.

Note : You can query current default profile settings using as below

select * from DBA_PROFILES where profile='DEFAULT';

Starting from 12c this file (utlpwdmg.sql) creates four functions under user SYS. Here we have an option to select one from four functions.

ORA12C_STRONG_VERIFY_FUNCTION
ORA12C_VERIFY_FUNCTION
VERIFY_FUNCTION
VERIFY_FUNCTION_11G

This function makes the minimum complexity checks like the minimum length of the password, password not same as the
username, etc. The user may enhance this function according to your need.

You can change the password verify function by using below sql :

ALTER PROFILE "DEFAULT" LIMIT PASSWORD_VERIFY_FUNCTION ORA12C_VERIFY_FUNCTION

IT SETS UP FOLOWING PARAMETERS IN DEFAULT PROFILE:

ALTER PROFILE DEFAULT LIMIT
PASSWORD_LIFE_TIME 180
PASSWORD_GRACE_TIME 7
PASSWORD_REUSE_TIME UNLIMITED
PASSWORD_REUSE_MAX  UNLIMITED
FAILED_LOGIN_ATTEMPTS 10
PASSWORD_LOCK_TIME 1

-- This script alters the default parameters for Password Management. This means that all the users on the system have Password Management enabled and set to the following values unless another profile is created with parameter values set to different value or UNLIMITED  is created and assigned to the user.

LETS TEST THE PASSWORD FUNCTION BY CREATING A NEW USER.

SQL> create user C##atest identified by atest11;

Error starting at line : 2 in command -
create user C##atest identified by atest11
Error report -
SQL Error: ORA-28003: password verification for the specified password failed
ORA-20001: Password length less than 8
28003. 00000 -  "password verification for the specified password failed"
*Cause:    The new password did not meet the necessary complexity
           specifications and the password_verify_function failed
*Action:   Enter a different password. Contact the DBA to know the rules for
           choosing the new password

          
While using length of 8 chars I was able to create user.

SQL> create user C##atest identified by atest113;

User C##ATEST created.


Follow this link on how to disable Password verify function  : 

http://arvindasdba.blogspot.com/2013/06/disable-password-verify-function-in.html