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TIP Statement execution = DB privilege + DBV command rule This implies that a realm authorization that would allow for a command to be executed can be overruled by a command rule Further, an object does not need to be protected by a realm for a command rule to be evaluated A fundamental difference in the behavior of command rules and realms is that command rules apply both to the use of system ANY privileges and direct object privileges The following table compares the differences between these two controls: DBV Control DBV realm Direct Object Privileges Implicitly allowed System ANY Privileges Requires that realm authorization and realm authorization rule are set to TRUE (if defined) Rule set must be TRUE
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Let s look at an example to demonstrate the relationship of DBV realms and command rules An organization s IT policy should have controls on the types of database administration that can occur when critical systems are being used by the general user population An organization s IT department will typically create system maintenance windows to make system changes in addition to configuration management procedures for validating these changes before they are deployed Building on the realm examples, we can use DBV command rules to establish controls based on a business rule such as a system maintenance window for the activities of the database administrators who manage the objects protected by the Sales History realm We first need to identify the rules are a system maintenance window using a DBV rule set:
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dbvowner@aos>-- First, define the "system maintenance window" rule dbvowner@aos>-- The IT department's policy allows for system dbvowner@aos>-- maintenance on Fridays from 5 pm to 11 pm dbvowner@aos> BEGIN dbms_macadmcreate_rule( rule_name => 'Is Maintenance Timeframe' , rule_expr => 'TRIM(TO_CHAR(SYSDATE,''DAY'')) = ''FRIDAY'' AND TO_CHAR(SYSDATE,''HH24'') BETWEEN 17 AND 23' ); END; / PL/SQL procedure successfully completed dbvowner@aos>-- We need to define a DBV Rule Set as a container dbvowner@aos>-- for the 'Is Maintenance Timeframe' rule dbvowner@aos>-- This rule set defines the auditing and error handling dbvowner@aos>-- for any DBV control that uses the Rule Set dbvowner@aos>BEGIN dbms_macadmcreate_rule_set( rule_set_name => 'Is System Maintenance Allowed', description => 'Checks to determine if the system maintenance is allowed', enabled =>dbms_macutlg_yes, eval_options =>dbms_macutlg_ruleset_eval_all, audit_options =>dbms_macutlg_ruleset_audit_fail,
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fail_options =>dbms_macutlg_ruleset_fail_show, fail_message =>NULL, fail_code =>NULL, handler_options =>dbms_macutlg_ruleset_handler_off, handler =>NULL);
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END; / PL/SQL procedure successfully completed dbvowner@aos>-- We can now associate the DBV Rules we want to be true dbvowner@aos>-- for the DBV Rule Set to evaluate to true dbvowner@aos>BEGIN dbms_macadmadd_rule_to_rule_set ( rule_set_name => 'Is System Maintenance Allowed' , rule_name => 'Is Maintenance Timeframe' ); END; / PL/SQL procedure successfully completed
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A DBV rule set controls the auditing and error-handling aspects for any DBV component with which it is used This means that auditing on failure for a DBV rule set will audit when the rule set is used with a DBV command rule or DBV realm authorization The DBV rule set contains just one DBV rule, Is Maintenance Timeframe , but an organization could define additional rules that might be required to match the business rules for system maintenance Once the DBV rule set is defined, a DBV command rule for a potentially dangerous database command such as DROP TABLE can be defined to use this DBV rule set to protect any of the tables in the SH object owner account:
dbvowner@aos> BEGIN dbms_macadmcreate_command_rule ( command => 'DROP TABLE' ,rule_set_name => 'Is System Maintenance Allowed' ,object_owner => 'SH' ,object_name => '%' ,enabled => 'Y' ); END; / PL/SQL procedure successfully completed
If the junior database administrator ANTHONY attempts to issue the DROP TABLE command outside of this maintenance window time frame on one of the objects protected by the Sales History realm, the command will fail our DBV command rule:
anthony@aos>SELECT TO_CHAR(SYSDATE,'DAY') "DAY_OF_WEEK", TO_CHAR(SYSDATE,'HH24') "HOUR_OF_DAY" FROM DUAL; DAY_OF_WEEK HO ------------------------------------ -MONDAY 10
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