6-28. Oracle Password Verification Function: VERIFY_FUNCTION

The Oracle server provides a password complexity verification function named VERIFY_FUNCTION. This function is created with the /rdbms/admin/utlpwdmg.sql script. The password complexity verification function must be created in the SYS schema. It can be used as a template for you customized password verification.

The supplied password verification function enforces these password restrictions:

• The minimum length is four characers.
• The password cannot be the same as the username.
• The password must have at least one alphabetic, one numeric, and one special character.
• The password must differ from the prvious password by at least three letters.

In adittion to creating VERIFY_FUNCTION, the utlpwdmg script also changes the DEFAULT profile with the following ALTER PROFILE command:

ALTER PROFILE default LIMIT
PASSWORD_LIFE_TIME 60
PASSOWRD_GRACE_TIME 10
PASSWORD_REUSE_TIME 1800
PASSWORD_REUSE_MAX UNLIMITED
FAILED_LOGIN_ATTEMPTS 3
PASSWORD_LOCK_TIME 1/1440
PASSWORD_VERIFYH_FUNCTION verify_function;