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Any user account that is locked can be unlocked for free access with the following statement: SQL> ALTER USER hr ACCOUNT UNLOCK; User altered. SQL> You can make Oracle lock any account after a certain number of failed login attempts with the CREATE or ALTER PROFILE statement. Oracle lets you specify how long you want the account to be locked after making the specified login attempts to enter the database; after that time is reached, Oracle will automatically unlock the account. To close this loophole, simply set the locked time period to UNLIMITED. Here s an example of creating a profile with the time period for locking the account: SQL> CREATE PROFILE test_profile 2 LIMIT FAILED_LOGIN_ATTEMPTS 5 3* PASSWORD_LOCK_TIME UNLIMITED Profile created. SQL>
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CHAPTER 11 USER MANAGEMENT AND DATABASE SECURITY
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The database will lock an account once the FAILED_LOGIN_ATTEMPTS limit is reached. However, the DBA can unlock a user s account at any time by using the following command: SQL> ALTER USER hr ACCOUNT UNLOCK; User altered. SQL>
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Password aging policies, which ensure that users don t hang onto the same password for a long time, are a standard part of database security. Once a password expires, the user is forced to change it. You can make a password expire with the ALTER USER command, as shown here: SQL> ALTER USER hr IDENTIFIED BY hr PASSWORD EXPIRE; User altered. SQL> You can also make a password expire with the ALTER PROFILE command: SQL> ALTER PROFILE test_profile 2* LIMIT PASSWORD_LIFE_TIME 30; Profile altered. SQL> ALTER USER hr PROFILE test_profile; User altered. SQL> The preceding ALTER PROFILE statement limits the password life to 30 days, and you can gently remind the user about this by using another clause in your ALTER PROFILE statement, PASSWORD_ GRACE_TIME 7, which means that the user will be reminded for seven days prior to the final expiration of the password. After the user s password expires, the password must be changed: SQL> CONNECT hr/hr ERROR: ORA-28001: the password has expired Changing password for hr New password: ** Retype new password: ** Password changed Connected. SQL>
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Oracle will let you choose how you want your privileged users to connect to the database. Privileged users are those users who can perform tasks such as starting up and shutting down the database. By default, only the SYS user has the SYSDBA and SYSOPER privileges, both of which are considered high-level privileges. The SYS user can grant these privileges to other users. Of course, any DBA who knows the SYS password can log in as SYS and perform the privileged tasks. However, by granting the critical privileges SYSDBA and SYSOPER explicitly to users, you force them to provide their username and password, which makes it easy to track the actions of privileged users. The REMOTE_LOGIN_PASSWORDFILE initialization parameter specifies whether Oracle checks for a password file.
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CHAPTER 11 USER MANAGEMENT AND DATABASE SECURITY
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The REMOTE_LOGIN_PASSWORDFILE parameter can take the following two values: none: No password file is used. This is the default, and it permits only operating system authenticated users to perform privileged database administration tasks. shared: Creates a password file that can be used by multiple databases running on a single server. The password file includes both SYS and non-SYS users. Any user that is granted the SYSDBA or SYSOPER privilege is automatically added to the password file. Oracle recommends that you use the REMOTE_LOGIN_PASSWORDFILE=SHARED option for the highest degree of security. There is a way to manually create a password file and specify which users can have the SYSDBA and SYSOPER privileges, but if you use the SHARED option, Oracle will automatically add users to the password file upon their being granted the SYSDBA and SYSOPER privileges. You can use the V$PWFILE_USERS view to see who has been granted these privileges besides the default SYS user by using the following query: SQL> CONNECT sys/life1 AS SYSDBA; Connected. SQL> GRANT sysoper, sysdba TO tester; Grant succeeded. SQL> SELECT * FROM v$pwfile_users; USERNAME SYSDB SYSOP -----------------------------SYS TRUE TRUE TESTER TRUE TRUE SQL>
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