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A user s profile controls their password settings and provides a limited amount of control over resource usage Use of profiles is detailed in the later section Create and Manage Profiles Profiles are a useful way of managing passwords and resources but can really only apply in an environment where every application user has their own database user account For example, if many users connect to the same database user account, you would not want the password to be invalidated by one of them, because that would lock out everyone else Similarly, resource usage will often need to be managed on a per-session basis rather than for the account as a whole
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Every user account has a certain status, as listed in the ACCOUNT_STATUS column of DBA_USERS There are nine possibilities: OPEN The account is available for use
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LOCKED This indicates that the DBA deliberately locked the account No user can connect to a locked account
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6: Oracle Security
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EXPIRED This indicates that the password lifetime has expired Passwords can have a limited lifetime No user can connect to an EXPIRED account until the password is reset EXPIRED & LOCKED Not only has the account been locked, but its password has also expired EXPIRED (GRACE) This indicates that the grace period is in effect A password need not expire immediately when its lifetime ends; it may be configured with a grace period during which users connecting to the account have the opportunity to change the password LOCKED (TIMED) This indicates that the account is locked because of failed login attempts An account can be configured to lock automatically for a period after an incorrect password is presented a certain number of times EXPIRED & LOCKED (TIMED) EXPIRED (GRACE) & LOCKED EXPIRED (GRACE) & LOCKED (TIMED) To lock and unlock an account, use these commands:
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ALTER USER username ACCOUNT LOCK ; ALTER USER username ACCOUNT UNLOCK ;
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PART I
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To force a user to change their password, use this command:
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ALTER USER username PASSWORD EXPIRE;
This will immediately start the grace period, forcing the user to make a password change at their next login attempt (or one soon after) There is no such command as alter unexpire The only way to make the account fully functional again is to reset the password
Authentication Methods
A user account must have an authentication method: some means whereby the database can determine if the user attempting to create a session connecting to the account is allowed to do so The simplest technique is by presenting a password that will be matched against a password stored within the database, but there are alternatives The possibilities are Operating system authentication Password file authentication Password authentication External authentication Global authentication
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The first two techniques are used only for administrators; the last requires an LDAP directory server The LDAP directory server may be the Oracle Internet Directory, shipped as a part of the Oracle Application Server
Operating System and Password File Authentication
To enable operating system and password file authentication (the two go together) for an account, you must grant the user either the SYSDBA or the SYSOPER privilege:
GRANT [sysdba | sysoper ] TO username ;
Granting either (or both) of these privileges will copy the user s password from the data dictionary into the external password file, where it can be read by the instance even if the database is not open It also allows the instance to authenticate users by checking whether the operating system user attempting the connection is a member of the operating system group that owns the Oracle Home installation Following database creation, the only user with these privileges is SYS To use password file authentication, the user can connect with this syntax using SQL*Plus:
CONNECT username / password [@db_alias] AS [ SYSOPER | SYSDBA ] ;
Note that password file authentication can be used for a connection to a remote database over Oracle Net To use operating system authentication, the user must be first logged on to the database server after being authenticated as an operating system user with access to the Oracle binaries before connecting with this syntax using SQL*Plus:
CONNECT / AS [ SYSOPER | SYSDBA ] ;
The operating system password is not stored by Oracle, and therefore there are no issues with changing passwords The equivalent of these syntaxes is also available when connecting with Database Control, by selecting SYSDBA from the Connect As drop-down box on the Database Control login window To determine to whom the SYSDBA and SYSOPER privileges have been granted, query the view V$PWFILE_USERS Connection with operating system or password file authentication is always possible, no matter what state the instance and database are in, and is necessary to issue STARTUP or SHUTDOWN commands A third privilege that operates in the same manner as SYSDBA and SYSOPER is SYSASM This is a privilege that is only applicable to ASM instances and is detailed in 20 TIP All user sessions must be authenticated There is no such thing as an anonymous login, and some authentication method must be used
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