Sunday, January 13, 2013

Two New Group Privileges in DB2 10 for z/OS

DB2 10 for z/OS delivers two new group level privileges to enable more granular and functional security support for DB2 administrators. The system DBADM authority is for DBAs at shops looking to minimize SYSADM usage, and SQLADM authority is for users who focus predominantly on performance-related issues.

System DBADM Authority is a DB2 V10  capability to better support separation of duties. System DBADM authority can be assigned to enable a user to manage all objects within a DB2 subsystem but without necessarily accessing data. This authority can be granted to an authid or role. By using system DBA authority judiciously, the need for SYSADM authority can be minimized.

So, as of DB2 V10, DBADM security can be granted at the system level, or at a database-by-database level as in all past versions of DB2.

Two granular options can be set when granting system DBADM authority: ACCESSCTRL and DATAACCESS. You can specify whether the system DBADM designation is to be granted with or without either.

Specifying WITH ACCESSCTRL indicates that the ACCESSCTRL authority is granted along with the system DBADM authority. ACCESSCTRL enables system DBADM to grant all authorities and privileges, except system DBADM, DATAACCESS, ACCESSCTRL authorities and privileges on security-related objects. And, of course, WITHOUT ACCESSCTRL specifies that these abilities are not granted to the system DBADM.
Specifying WITH DATAACCESS indicates that the DATAACCESS authority is granted along with the system DBADM authority. DATAACCES enables the system DBADM to access data in all user tables, views, and materialized query tables in a DB2 subsystem and enables the user to execute plans, packages, functions, and procedures. Specifying WITHOUT DATAACCESS specifies that the capability to access data is not granted to the system DBADM.

Many security regulations and compliance initiatives favor prohibiting high-level authorities, such as SYSADM and DBADM, being conferred with data access privileges. Keeping administrative and data access separate is another control designed to protect user data. 

DB2 V10 also introduces the ability to grant the SQLADM privilege for DBAs who work as SQL performance specialists. Some organizations delineate job responsibilities into granular roles, such as recovery DBA or SQL performance tuner.

The SQLADM privilege can be granted to authids and roles. An agent with SQLADM authority can perform SQL and SQL performance management-related actions without requiring any additional privileges.

SQLADM authority includes the capability to perform the following:
  •  Issue the DESCRIBE TABLE statement.
  •  Execute the EXPLAIN statement with any of the following options: PLAN, ALL
  •  Execute the PREPARE statement.
  •  Explain dynamic SQL statements that execute under the special register CURRENT EXPLAIN MODE, when CURRENT EXPLAIN MODE = EXPLAIN.
  •  Issue BINDs specifying EXPLAIN(ONLY) or SQLERROR(CHECK).
  •  Issue START and STOP commands.
  •  Issue the DISPLAY PROFILE command.
  •  Execute the RUNSTATS and MODIFY STATISTICS utilities for any database.
  •  Obtain appropriate IFCID data using the MONITOR2 privilege. 

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