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You ve seen how you can enforce row-level security anytime you access a table. Oracle also lets you use a column-level VPD to enforce row-level security whenever a query references a certain column or columns only. You can apply column-level VPD to a table or a view. Creating a column-level security policy is almost identical to creating regular security policies you just add the additional SEC_RELEVANT_COLS parameter in the DBMS_RLS.ADD_POLICY procedure to specify the relevant columns for security. Here s how you use the DBMS_RLS.ADD_POLICY procedure to create a column-level security policy. SQL> BEGIN 2 dbms_rls.add_policy 3 (object_schema => 4 object_name => 5 policy_name => 6 function_schema => 7 policy_function => 8 statement_types => 9 sec_relevant_cols => 10*END; SQL> /

Figure 13-23. Selecting a MessageQueue object The MessageQueue properties will appear something like Figure 13-24.

'hr', 'employees', 'manager_policy', 'hr', 'hr_security.empnum_sec', 'select,insert', 'salary');

The column-level policy created in the preceding example would come into effect only if the salary column of the employees table is accessed. Suppose a user subsequently issues the following query: SQL> SELECT fname, lname, salary FROM employees;

The column-level VPD policy kicks into action when it sees that the salary column is referenced in a query, and the policy function implementing the column-level security policy returns the predicate WHERE salary ='my_salary', thus transforming the query as follows: SQL> SELECT fname, lname, salary FROM employees WHERE salary = 'my_salary';

Figure 13-24. The default properties of a MessageQueue Change the Path property to reference the computer on which you re running MSMQ. Make sure the queue name you choose corresponds to one you created in MSMQ. Also, make sure you change the paths of all the MessageQueue objects on all the various Router components. If you configure a path incorrectly, errors occur at run time.

When you access a table, Oracle looks up the application context (the policy context) to determine which policy group, and therefore which security policy, should be enforced. There is one default policy group called SYS_DEFAULT that can never be dropped from the database, and every policy belongs to this group by default.

You can use the Oracle Policy Manager GUI, an extension to Oracle Enterprise Manager, to administer Oracle Label Security (discussed next) as well as to create VPD security policies. Oracle Policy Manager will help you effortlessly create application contexts and complex security policies to enforce fine-grained data security. This definitely beats creating application contexts and security policies manually. When you use OEM to create a VPD policy, you create an application context and provide the table (or view or synonym) name, the policy name, the function name that generates the predicate, and the statement types to which the policy applies (SELECT, INSERT, UPDATE, or DELETE). Oracle Policy Manager executes the DBMS_RLS.ADD_POLICY function to create the FGAC policy to support your VPD.

To test the system, you need to run several programs at once. Visual Studio allows you to designate more than one program as the Startup Project. You can also control the order in which the various programs start. To designate multiple Startup Projects, right-click on the Solution node in the Solution Explorer. From the context menu, select the command Set Startup Projects. You ll see the dialog shown in Figure 13-25.

Oracle allows you to label parts of your data, and users can be granted privileges to access data with certain labels. Security policies are implemented on a single column, which represents the label. The Oracle Label Security feature (based on the older Trusted Oracle security product) is built on the same components that help you create a VPD. You can easily construct labels to limit access to rows in a certain table, and use label authorizations and privileges to set up a label-based security policy. The Oracle Policy Manager GUI is mainly designed to create and administer Oracle Label Security policies.