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Database Vault Fundamentals
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the example here to clarify that a single access control policy is active The DBV realm administrator, MARY, of the Sales History realm can perform these steps
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mary@aos> -- remove the VPD example from the previous example mary@aos> BEGIN dbms_rlsdrop_policy( object_schema => 'SH' ,object_name => 'CUSTOMERS' ,policy_name => 'POLICY_CUSTOMERS' ); END; / PL/SQL procedure successfully completed mary@aos>-- add the column to the customer table mary@aos>-- to hold the OLS security label mary@aos> ALTER TABLE shcustomers ADD customer_label NUMBER; Table altered mary@aos> -- populate the customer_label column with the appropriate mary@aos> -- data label for LOW credit limit customers mary@aos> UPDATE shcustomers SET customer_label = 10 WHERE cust_credit_limit < 5000; 19309 rows updated mary@aos> -- populate the customer_label column with the appropriate mary@aos> -- data label for MODERATE credit limit customers mary@aos> UPDATE shcustomers SET customer_label = 20 WHERE cust_credit_limit BETWEEN 5000 AND 9999; 25451 rows updated mary@aos> -- populate the customer_label column with the appropriate mary@aos> -- data label for HIGH credit limit customers mary@aos> UPDATE shcustomers SET customer_label = 30 WHERE cust_credit_limit >= 10000; 10740 rows updated mary@aos> -- save the data changes mary@aos>COMMIT; Commit complete
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The next step is to use the LBACSYS account to apply our OLS policy to the SHCUSTOMERS This will provide the label-based access control protection on the table for any subsequent SELECT, INSERT, UPDATE, or DELETE transactions on the table To perform this step, we must consider that OLS places Oracle database triggers on tables that are being protected These triggers are used to ensure that labels for new data records are provided and will perform auditing for OLS operations on the protected tables The SHCUSTOMERS table is protected by the Sales History realm that will obviously prevent these CREATE TRIGGER statements from completing
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successfully The best approach to handling this is to authorize the LBACSYS account in the Sales History realm as a participant rather than disabling the realm altogether
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dbvowner@aos> -- authorize LBACSYS in the Sales History realm dbvowner@aos> BEGIN dbms_macadmadd_auth_to_realm ( realm_name =>'Sales History' , grantee => 'LBACSYS' , rule_set_name => NULL , auth_options => dbms_macutlg_realm_auth_participant ); END; / PL/SQL procedure successfully completed dbvowner@aos>connect lbacsys Enter password: Connected lbacsys@aos> -- apply the OLS policy to the customer lbacsys@aos> -- table with the table-specific lbacsys@aos> -- access control options lbacsys@aos> BEGIN sa_policy_adminapply_table_policy( policy_name => 'CUSTOMER_POLICY' , schema_name => 'SH' , table_name => 'CUSTOMERS' , table_options => 'READ_CONTROL,WRITE_CONTROL,CHECK_CONTROL' ); END; / PL/SQL procedure successfully completed
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At this point in the configuration, the DBV Sales History realm administrator, MARY, cannot query data in the SHCUSTOMERS table
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mary@aos> SELECT cust_last_name , cust_year_of_birth , cust_marital_status , cust_income_level FROM shcustomers WHERE cust_state_province = 'TX' AND ROWNUM < 1 ORDER BY cust_last_name / no rows selected
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We have to assign MARY a label range in the OLS policy using the LBACSYS account We want to provide MARY full access to all records in the SHCUSTOMERS table so the range that will be assigned to her will be LOW HIGH
-- assign the labels ranges of data -- records that MARY can read and write
5:
BEGIN sa_user_adminset_user_labels( policy_name => 'CUSTOMER_POLICY' , user_name => 'MARY' , min_write_label => 'LOW' , max_read_label => 'HIGH' , max_write_label => 'HIGH' , def_label => 'HIGH' , row_label => 'HIGH' ); END; / PL/SQL procedure successfully completed
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As a result of this label range assignment, MARY can now access the records in the SHCUSTOMERS table
mary@aos> -- query the SHCUSTOMERS table mary@aos> SELECT cust_last_name , cust_year_of_birth , cust_marital_status , cust_income_level FROM shcustomers WHERE cust_state_province = 'TX' AND ROWNUM < 10 ORDER BY cust_last_name / CUST_LAST_ CUST_YEAR_OF_BIRTH CUST_MARIT CUST_INCOME_LEVEL ---------- ------------------ ---------- ------------------------Beiers 1982 single K: 250,000 - 299,999 Duval 1981 single H: 150,000 - 169,999 Greeley 1977 F: 110,000 - 129,999 Grover 1970 married D: 70,000 - 89,999 Hamilton 1961 single G: 130,000 - 149,999 Krider 1967 F: 110,000 - 129,999 Majors 1948 single G: 130,000 - 149,999 Rowley 1969 single H: 150,000 - 169,999 Stone 1978 single I: 170,000 - 189,999 9 rows selected
Having defined the OLS policy for the table, we want to protect and authorize the named users in this OLS policy, and we can remove the realm authorization for the LBACSYS account in the Sales History realm We can also identify this OLS policy as being integrated with DBV using the PL/SQL procedure DBMS_MACADMCREATE_MAC_POLICY
dbvowner@aos> -- remove the realm authorization for LBACSYS dbvowner@aos> -- as we've applied the policy on the table dbvowner@aos> BEGIN dbms_macadmdelete_auth_from_realm ( realm_name =>'Sales History' , grantee => 'LBACSYS' );
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