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Database Vault Fundamentals
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dbms_macadmupdate_rule_set( rule_set_name =>'Using Financials Application', description =>'Checks to verify commands came are executed from trusted financials packages', enabled =>dbms_macutlg_yes, eval_options =>dbms_macutlg_ruleset_eval_all, audit_options =>dbms_macutlg_ruleset_audit_fail, fail_options =>dbms_macutlg_ruleset_fail_show, fail_message =>NULL, fail_code =>NULL, handler_options =>dbms_macutlg_ruleset_handler_fail, handler =>'shsales_alertssales_update_alert' ); END; / PL/SQL procedure successfully completed mary@aos> -- Attempt to update the table outside the policy mary@aos> UPDATE shsales SET amount_sold = 200 WHERE cust_id = 305; UPDATE shsales * ERROR at line 1: ORA-01031: insufficient privileges mary@aos> -- View our alerts mary@aos> SELECT * from shalerts; MSG ---------------------------------------------------------------MSGDATE --------Alert for Rule Set:Using Financials Application, result is FALSE 12-JUL-08
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As you can see, it s a straightforward process to configure your DBV rule set to call custom event handlers This opens up many possibilities to use e-mail, pagers, systems management tools like Oracle Enterprise Manager Grid Control, and other third-party security monitoring tools for handling notification and monitoring based on security-related events In 7, we present a more advanced example custom event handler that will give you full details on the transaction that was involved in DBV violation
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The rule expressions used in DBV rule sets must be expressed as a valid PL/SQL expression that evaluates to TRUE or FALSE This does not imply that you need to return a PL/SQL Boolean data type, but rather you must express the rule as a PL/SQL expression that you could use in an Oracle SQL WHERE clause The way to test your rule is to run the command in Oracle SQL*Plus or Oracle SQL Developer using this syntax:
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SELECT COUNT(*) FROM SYSDUAL WHERE <rule expression>;
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If the rule expression passes this syntax check, meaning that the above SQL executes without a syntax error, then the rule expression is safe to use It is recommended that you use compiled PL/SQL package functions (or stand-alone PL/SQL functions) if your rule expression logic is large or complex or requires PL/SQL components not normally embedded in SQL expressions Using this approach helps in the following ways: The approach helps performance, as the code is precompiled and does not need to be parsed at runtime The approach improves maintenance of the security policy in development, as the code can be changed and tuned when testing for both security and performance begins The approach improves readability of the security policy for auditors, especially if the functions names are indicative of their purpose You can leverage predefined DBV rule set event functions as parameters to this function
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The process for creating a rule expression involves defining PL/SQL functions that simply return 0 or 1 (for failure and success) and then granting EXECUTE on this function to DVSYS Using PL/SQL functions is preferable, because you will find that the decision point logic is a nontrivial case-like decision, could involve SQL queries, and over time is easier to maintain and deploy in a compiled procedure The following example illustrates this point:
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mary@aos> CREATE OR REPLACE FUNCTION shcan_perform_sales_summary RETURN NUMBER AS l_day VARCHAR2(10) := TRIM(TO_CHAR(SYSDATE,'DAY')); l_hour VARCHAR2(2) := TO_CHAR(SYSDATE,'HH24'); BEGIN -- allow sales summary logic to run on weekends or week nights -- weekend IF l_day IN ( 'SATURDAY', 'SUNDAY' ) THEN RETURN 1; -- weekday - business hours ELSIF l_hour BETWEEN '08' AND '04' THEN RETURN 0; -- week night ELSE RETURN 1; END IF; END; / Function created mary@aos> GRANT EXECUTE ON shcan_perform_sales_summary TO dvsys; Grant succeeded
The logic checks the day of the week and the time of day to return a 0 or 1 that will authorize the execution of a sales summary package during the business nonworking (for some people) hours We can then use this function in a DBV rule set as follows:
dbvowner@aos> -- Create the DBV Rule BEGIN dbms_macadmcreate_rule( rule_name => 'Is Sales Summary Allowed' , rule_expr => 'shcan_perform_sales_summary = 1' ); END;
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