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The predicate parameter is an additional SQL predicate that can be combined dynamically, using the AND or the OR logical operator, with the predicated returned from a label function We can use a predicate similar to the VPD example presented earlier to combine label security with the operational concept of restricting access during the weekly maintenance window as follows:
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, predicate => ' AND DVFF$Is_Maintenance_Window = 0'
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The same type of factor-based policy can be applied to the OLS package procedure SA_ POLICY_ADMINAPPLY_SCHEMA_POLICY This defines policies at the database schema level so that all existing or new tables in a particular schema can share the same (consistent) policy definition
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Factors in Oracle Fine-Grained Auditing (FGA)
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Regular Oracle database auditing allows you to audit commands issued against a database object every time the command is issued This can typically lead to more audit data than you may want to store when you really just want to audit when certain conditions are met These conditions may be driven by compliance purposes and can be dynamic in nature The Oracle FGA feature is designed to meet the needs of object-level auditing only when certain conditions are met Consider the Sales History application and the table SHCUSTOMERS that includes credit limit information for the customer in CUST_CREDIT_LIMIT Our condition may be that we are interested in auditing only SELECT commands against this table only by users that are not members of the Sales Department and for customers with higher credit limits Use of these commands may imply suspicious behavior on behalf of a non-sales staff member In 5, we defined a DBV factor that exposes the user s department name so we can leverage this factor in an FGA policy s audit condition as follows:
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BEGIN dbms_fgaadd_policy ( object_schema =>'SH' , object_name =>'CUSTOMERS' , policy_name =>'SUSPICIOUS_CUSTOMER_ACCESS' , audit_column => 'CUST_GENDER,CUST_YEAR_OF_BIRTH' || ',CUST_MARITAL_STATUS,CUST_INCOME_LEVEL,CUST_CREDIT_LIMIT' , audit_condition => 'CUST_CREDIT_LIMIT >= 10000' || ' AND DVFF$User_Department_Name != ''Sales''' , statement_types => 'SELECT' ); END;
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Another form of RLS that has been used by many applications is to embed filter logic directly in database views The implementation of factors as PL/SQL functions creates an opportunity to use them directly in view definitions The following view for sales costs will prevent data being returned during the weekly maintenance window time frame:
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CREATE OR REPLACE VIEW shcosts_view AS SELECT productsprod_name , promotionspromo_name , channelschannel_desc , costsunit_cost , costsunit_price FROM shcosts, shproducts, shpromotions,shchannels
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6: Applied Database Vault for Custom Applications
WHERE productsprod_id = costsprod_id AND promotionspromo_id = costspromo_id AND channelschannel_id = costschannel_id AND DVFF$Is_Maintenance_Window = 0 /
Factors in Application Code (PL/SQL or SQL Statements)
Factors can be used in application code that exists outside the database The preceding examples show how factors can be embedded within other database objects It is important to remember that factors are available as PL/SQL functions and can be included within SQL anywhere it may reside The implementation of factors as PL/SQL functions can be very similar to the view in the preceding paragraph The following SQL statement will be defined and executed from the application tier The query of sales costs will prevent data from being returned during the weekly maintenance window time frame:
SELECT productsprod_name , promotionspromo_name , channelschannel_desc , costsunit_cost , costsunit_price FROM shcosts, shproducts, shpromotions,shchannels WHERE productsprod_id = costsprod_id AND promotionspromo_id = costspromo_id AND channelschannel_id = costschannel_id AND DVFF$Is_Maintenance_Window = 0 /
The factor is resolved when executed within the database The factor is evaluated and returned to the SQL statement, and then applied as a filter inside the statement itself Factor functions are automatically granted to PUBLIC through a special DBV role named DV_PUBLIC No special work is required to leverage them in PL/SQL code you write as packaged procedures as well as SQL statements that applications or end users issue You can use the two forms of factor identity retrieval the DVF schema s factor function or the DVSYS GET_FACTOR function as follows:
IF DVFF$Is_Maintenance_Window = 1 THEN logic here END IF;
Or equivalently,
IF DVSYSGET_FACTOR('Is_Maintenance_Window') = 1 THEN logic here END IF;
This simplifies application logic by reducing the need for common code to be copied or shared among projects and can help performance when the factors are evaluated at session startup (or when proxy authentication sessions start) The result is application code that is more declarative in nature with respect to security The use of the function DVSYSGET_FACTOR would be preferable when the name of the factor is dynamic depending on your implementation or project
Part II:
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