java barcode reader tutorial Realm Authorizations Controlled with DBV Rule Sets in Java

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Realm Authorizations Controlled with DBV Rule Sets
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Realm authorizations can be configured so that authorization is controlled using a DBV rule set that define the conditions (when, where, how) in which a session may leverage system ANY privileges on objects protected by the realm This feature is extremely important if you want to provide a higher level of assurance that data is accessed or manipulated in the context of its intended usage The concept of intended usage is crucial to your ability to ensure compliance regulations are met and insider threats are minimized We can demonstrate the impact of a DBV rule set on realm authorizations MARY is the primary database administrator of the objects protected by the Sales History realm and ANTHONY is the alternate database administrator of these objects, possibly while MARY is on vacation or has called in sick If MARY were out on vacation or were sick, we might expect the company s security system not to have a record of her badging-in for the day or the Human Resources system may have a record of her vacation dates A DBV rule set named CheckPrimaryAdminStatus could be created that integrates into these types of systems to determine whether the primary application DBA MARY is working on a particular day The rule set can dynamically query these systems to decide whether to turn off a realm authorization This type of integration
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can be accomplished by updating the realm authorization previously defined for ANTHONY to use the new rule set:
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dbvowner@aos> -- modify the realm authorization for ANTHONY dbvowner@aos> -- to be based on the Disabled DBV Rule Set dbvowner@aos>BEGIN dbms_macadmupdate_realm_auth ( realm_name =>'Sales History' , grantee => 'ANTHONY' , rule_set_name => 'CheckPrimaryAdminStatus' , auth_options => dbms_macutlg_realm_auth_participant ); END; / PL/SQL procedure successfully completed
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If ANTHONY attempts to leverage his realm authorization after this modification and MARY is at work, the previously successful DDL commands he could issue would be denied
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anthony@aos> -- Attempt an ALTER TABLE command that was previously allowed anthony@aos> ALTER TABLE shsales_staging ADD unit_of_measure VARCHAR2(10); ALTER TABLE shsales_staging ADD unit_of_measure VARCHAR2(10) * ERROR at line 1: ORA-00604: error occurred at recursive SQL level 1 ORA-47401: realm violation for alter table on SHSALES_STAGING ORA-06512: at "DVSYSAUTHORIZE_EVENT", line 55 ORA-06512: at line 31
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DBV rule sets powerfully impact realm authorizations in contributing the conditional (when, where, how) aspect of a sound security policies DBV rule sets also provide critical auditing and error-handling capabilities that we will explore a bit later in the chapter
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In the preceding section, we discussed how DBV realms protect an application schema s objects and database roles from the use of the powerful system ANY privileges that database administrators are typically granted The DBV product will intercept database commands as they are submitted to the database kernel s SQL engine Once the command is intercepted, the DBV kernel-resident code will examine the realm protection configuration to determine whether or not to allow the command Command rules are a second type of DBV protection and are part of the same enforcement process flow that provides a layer of security within DBV Statement-level controls are examined and enforced immediately after the realm protections are evaluated Command rules do not consider whether system ANY privileges or even direct object privileges are used, but focus on the command being used and the object being affected Command rules are like database triggers, but they were designed as a separate DBV security mechanism in which declarative rules can be applied to the execution of SQL statements and PL/SQL packages, provided a user had some permission to execute the statement This means a user must have some level of database permission to execute a statement before command rule can be enforced
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