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The function must be deterministic so that the predicate returned is always the same: if you have a branch in the function that can return different predicates, you must specify a dynamic security policy instead Shared static: This is identical to a static policy, and it is applied to multiple objects Shared policies reduce your administrative burden by letting a single security policy cover several database objects You can enable it by setting the POLICY_TYPE parameter to DBMS_RLSSHARED_STATIC Context sensitive: Under this type of security policy, the policy predicate can be modified based on changes in certain context attributes within a user s session The database caches the policy predicate in the SGA You choose this type by setting the POLICY_TYPE parameter to DBMS_RLSCONTEXT_SENSITIVE Shared context sensitive: This policy type is similar to context-sensitive policies, but it is shared across multiple objects.

You choose this type by setting the POLICY_TYPE parameter to DBMS_RLSSHARED_CONTEXT_SENSITIVE You can add a security policy to a database by using the DBMS_RLS package (RLS stands for row-level security) provided by Oracle This package enables you to administer security policies, which means you can add and drop policies, policy groups, or application contexts You provide the name of the table, view, or synonym for which you want the security policy to apply, as well as the security policy for implementing the FGAC You also specify the particular types of SQL statements the policy applies to, such as a SELECT, INSERT, UPDATE, DELETE, CREATE INDEX, or ALTER INDEX statement Here are the main procedures of the DBMS_RLS package: DBMS_RLSADD_POLICY: Adds a policy to a table, view, or synonym DBMS_RLSCREATE_POLICY_GROUP: Creates a policy group DBMS_RLS.

The central notification server that ties the whole system together in this case study is Microsoft MSMQ. You won t be able to run the case study unless you have MSMQ in your local environment somewhere. Before you try to run the code, you need to configure the Microsoft MSMQ queue paths. If you download the book s code, the server-side components by default reference MSMQ queues that won t exist in your system (barring a miracle). In my environment, MSMQ runs on a server named Alessandra. On this server, I configured a number of private MSMSQ queues with various names. You need to set up equivalent private queues on your MSMQ server. Each Router component in the server-side projects has one or more MessageQueue objects. Each object points to a given MSMQ queue. To change a queue path, open a Router in the Forms Designer and select the MessageQueue object, as shown in Figure 13-23.

ADD_POLICY_CONTEXT: Adds the context for the application You create the security policy using the DBMS_RLSADD_POLICY procedure, as shown here: SQL> CONNECT system/system_passwd Connected SQL> EXECUTE dbms_rlsadd_policy('hr','employees','manager_policy','hr','hr_securityempnum_sec','select'); PL/SQL procedure successfully completed Note that you could also have executed the preceding statement in the following equivalent manner: SQL> 2 3 4 5 6 7 BEGIN dbms_rlsadd_policy (object_schema => 'hr', object_name => 'employees', policy_name => 'manager_policy', function_schema => 'hr', policy_function => 'hr_securityempnum_sec',.

8 statement_types => 'select'); 9* END; SQL> / The DBMS_RLS.ADD_POLICY procedure in the preceding statements creates a policy called manager_policy in the hr schema. This security policy is actually implemented by the function empnum_sec, which is part of the hr_security package that you created earlier. The security policy specifies that it applies to all SELECT operations against the employees table. To put it simply, the new security policy you created (manager_policy) will limit all SELECT statements against the hr.employees table to information that pertains to the employee_id of the user who issued the query. You can check that the new policy was indeed created successfully by making the following query: SQL> SELECT object_name, policy_name, sel, ins, upd, del, enable FROM all_policies; OBJECT_NAME ----------EMPLOYEES SQL> The output of the query indicates that all SELECT statements against the employees table are now controlled by the manager_policy security policy. To make the security policy functions accessible to the public so that all users accessing the database will use it, you can make the following grant: SQL> GRANT EXECUTE ON hr_security TO public; Grant succeeded. POLICY_NAME ------------MANAGER_POLICY SEL ---YES INS --NO UPD ---NO DEL ---NO ENABLED -------YES