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ops$appserver_1@aos>-- on the correct client certificate being asserted ops$appserver_1@aos> BEGIN dvsysset_factor('Client_Identifier','jeffrey@mycompanycom'); END; / PL/SQL procedure successfully completed ops$appserver_1@aos> -- the factor now has the identity supplied ops$appserver_1@aos> -- set appropriately because our validation ops$appserver_1@aos> -- routine returned a boolean value of TRUE ops$appserver_1@aos> SELECT DVFF$Client_Identifier FROM dual; F$CLIENT_IDENTIFIER ----------------------------------------------------jeffrey@mycompanycom 1 row selected ops$appserver_1@aos>-- the CLIENT IDENTIFIER session context ops$appserver_1@aos>-- is also populated as expected based on the code ops$appserver_1@aos>-- defined in the validation function ops$appserver_1@aos> SELECTSYS_CONTEXT('USERENV','CLIENT_IDENTIFIER') FROM dual; SYS_CONTEXT('USERENV','CLIENT_IDENTIFIER') ----------------------------------------------------jeffrey@mycompanycom 1 row selected
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We can also test the ability to perform the assignment of this DBV factor with a certificatebased desktop user account ops$jeffrey using ASO PKI/SSL authentication to the database with a different Oracle wallet than the one we defined as trusted
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ops$jeffrey@aos> -- we attempt to set the DBV version of ops$jeffrey@aos> -- client identifier and it will fail based ops$jeffrey@aos> -- on an untrusted client certificate being asserted ops$jeffrey@aos> EXECUTE dvsysset_factor('Client_Identifier','jeffrey@mycompanycom'); BEGIN dvsysset_factor('Client_Identifier','jeffrey@mycompanycom'); END; * ERROR at line 1: ORA-47391: attempt to set Factor CLIENT_IDENTIFIER violates Rule Set Can Assign Client Identifier ORA-06512: at "DVSYSDBMS_MACSEC", line 3 ORA-06512: at "DVSYSDBMS_MACSEC", line 54 ORA-06512: at "DVSYSSET_FACTOR", line 5 ORA-06512: at line 1 ops$jeffrey@aos> -- the default state of the factor is NULL ops$jeffrey@aos> -- and preserved when the rule set ops$jeffrey@aos> -- authorization fails ops$jeffrey@aos> SELECT DVFF$Client_Identifier FROM dual; F$CLIENT_IDENTIFIER -----------------------------------------------------
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1 row selected ops$jeffrey@aos> -- the default CLIENT IDENTIFIER session context ops$jeffrey@aos> -- information is also preserved ops$jeffrey@aos> SELECT SYS_CONTEXT('USERENV','CLIENT_IDENTIFIER') FROM dual; SYS_CONTEXT('USERENV','CLIENT_IDENTIFIER') ----------------------------------------------------ANONYMOUS SALES HISTORY USER 1 row selected
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The DBV security administrator can view the DBV audit records for the factor assignment test cases using the DVA web application This report (shown in Figure 5-12) queries the table DVSYSAUDIT_TRAIL$ and the information can be correlated with the standard Oracle RDBMS audit trail stored in the SYSTEMAUD$ table and exposed through the DBA_AUDIT_TRAIL view The database administrator can query the DBA_AUDIT_TRAIL view for audit events where the CLIENT_ID column is populated with the successfully assigned factor values from our test We had integrated the DBMS_SESSIONSET_IDENTIFIER procedure that populates this CLIENT_ID column within the DBV factor validation method to ensure that our audit attribution capability remains intact The following query shows audit records that would be created if the Sales History web application issued a DELETE statement on the SHSALES table when using the connection pool account ops$appserver_1:
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sys@aos> SELECT username,client_id,action_name,owner,obj_name FROM dba_audit_trail WHERE owner = 'SH'; USERNAME CLIENT_ID ACTION_NAME OWNER OBJ_NAME ----------------- ---------------------- ------------ ------ ---------OPS$APPSERVER_1 jeffrey@mycompanycom DELETE SH SALES
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Factor audit report
Part II:
Oracle Database Vault
It is easy to see that DBV factor assignment provides additional access control and validation capabilities when used as a wrapper for traditional methods of asserting client information that use the DBMS_SESSION or DBMS_APPLICATION_INFO packages The feature provides the same benefits when used in lieu of custom Oracle application context objects and reduces the number of objects that must be maintained The feature extends the overall auditing capability for these traditional mechanisms while preserving the existing audit capabilities on which applications may rely
DBV Secure Application Roles
Oracle SARs are database roles that can be enabled only from within a PL/SQL program The PL/SQL program will typically perform a series of checks to determine whether the conditions are correct for the role to be enabled DBV provides an integration capability with Oracle SARs that allow you define these conditions using a DBV rule set To help illustrate how DBV Secure Application Roles work, consider the DBV Is System Maintenance Allowed rule set presented earlier in the chapter This rule set allowed system maintenance routines on Fridays from 5 to 11 PM We can reuse this rule set to control the ability to set a role that has DELETE privileges on tables protected by the Sales History DBV realm for the purpose of archiving and deleting records that no longer need to be maintained in the table Privileges that allow for the update or deletion of data are typically considered security-sensitive operations and are perfect candidates for DBV SARs TIP Use DBV SARs for security-sensitive privilege sets The first step in creating this type of capability requires that the DBV security administrator (DBVOWNER) create the DBV SARs using the DBMS_MACADMCREATE_ROLE PL/SQL procedure To secure the role from being granted or revoked outside the control of the Sales History realm administrator, MARY, we should also protect the role in the Sales History realm
dbvowner@aos> -- create the DBV Secure Application Role dbvowner@aos> BEGIN dbms_macadmcreate_role( role_name => 'SALES_ARCHIVE_ROLE' , enabled => 'Y' , rule_set_name => 'Is System Maintenance Allowed' ); END; / PL/SQL procedure successfully completed dbvowner@aos> -- protect the role in the Sales History realm dbvowner@aos> BEGIN dbms_macadmadd_object_to_realm ( realm_name => 'Sales History' ,object_owner => 'SH' ,object_name => 'SALES_ARCHIVE_ROLE'
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,object_type ); => 'ROLE'
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