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operations, we would create two separate DBV command rules, one for each SQL command The intent of the UPDATE and DELETE requirements are to protect the integrity of the audit trail both for compliance and conflict of interest concerns The question to ask is, Who should be able to update (alter) and delete the audit trails in a system The requirement is written such that the database administrators should not be able to update or delete the audit trail records, but the reality may be that no administrator or end user should have this capability We can implement this level of protection using the existing DBV rule set Disabled and create the two DBV COMMAND RULES By default, the Disabled DBV rule set has auditing turned off so we would want to enable auditing on this rule set
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diego_dbvmgr@aos>-- enable audit on the Disabled rule set diego_dbvmgr@aos>BEGIN dbms_macadmupdate_rule_set( rule_set_name =>'Disabled', description =>'Convenience rule set to quickly disable system features', 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_off, handler =>NULL); END; / PL/SQL procedure successfully completed diego_dbvmgr@aos>-- create the command rules for UPDATE and DELETE diego_dbvmgr@aos>BEGIN dbms_macadmcreate_command_rule ( command => 'DELETE' , rule_set_name => 'Disabled' , object_owner => 'SYSTEM' , object_name => 'AUD$' , enabled => dvsysdbms_macutlg_yes ); END; / PL/SQL procedure successfully completed diego_dbvmgr@aos>BEGIN dbms_macadmcreate_command_rule ( command => 'UPDATE' , rule_set_name => 'Disabled' , object_owner => 'SYSTEM' , object_name => 'AUD$' , enabled => dvsysdbms_macutlg_yes ); END; / PL/SQL procedure successfully completed diego_dbvmgr@aos>-- test the control by attempting diego_dbvmgr@aos>-- to delete the audit trail as SYSDBA
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diego_dbvmgr@aos>CONNECT / AS SYSDBA Connected sys@aos>DELETE systemaud$ WHERE ROWNUM < 2; DELETE systemaud$ WHERE ROWNUM < 2 * ERROR at line 1: ORA-01031: insufficient privileges
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This simple solution is secure enough, and the overall integrity of the audit trail is still protected via Oracle backup and recovery procedures We can also extend the policy to meet the row-level security requirement of not deleting records less than seven years old by applying an Oracle VPD policy to the table This control will offer additional protections for the unintentional deletion of the audit trail records inside the system maintenance window when DBV policy controls might be relaxed
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sys@aos>-- create the PL/SQL function used for the DELETE policy sys@aos>-- on the SYSTEMAUD$ table sys@aos>CREATE OR REPLACE FUNCTION systemaudit_policy_function( schema_name IN VARCHAR2 , table_name IN VARCHAR2 ) RETURN VARCHAR2 AS l_archive_date DATE; BEGIN -- prevent deletion of audit trail records less -- than the number of retention years specified -- in the DBV Factor Audit_Retention_Period l_archive_date := ADD_MONTHS ( SYSDATE , -1 * (DVFF$Audit_Retention_Period * 12)); -- return the SQL predicate that will protect any records -- that are still within the retention period RETURN 'NTIMESTAMP# <= TO_TIMESTAMP(''' || TO_CHAR(l_archive_date,'YYYY/MM/DD HH24:MI:SS') || ''',''YYYY/MM/DD HH24:MI:SS'')'; END; / Function created sys@aos>-- add the Oracle VPD policy to the audit trail table sys@aos>BEGIN dbms_rlsadd_policy( object_schema => 'SYSTEM' ,object_name => 'AUD$' ,policy_name => 'POLICY_AUD$' ,function_schema => 'SYSTEM' ,policy_function => 'AUDIT_POLICY_FUNCTION' ,statement_types => 'DELETE' ); END; / PL/SQL procedure successfully completed
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Depending on the life expectancy of your system, this may be all that is required, and you can simply leave the audit trail records online, even after the audit retention period has passed
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The decision depends on how much the audit trail will grow over time The retention requirements of seven years will allow you to archive and delete the audit trail at some point if reporting response times started to suffer The detailed solution for these types of requirement is somewhat beyond the scope of this chapter but might involve the following design approach: A PL/SQL package procedure will query the database audit trail for records that are older than the compliance-driven audit retention period This package procedure could write the resulting records to a file that is backed up to tape media We could also partition the SYSTEMAUD$ table by date and simply move this partition to an archive tablespace and take the partition offline for backup to tape This PL/SQL package procedure is scheduled to run as part of an Oracle DBMS_ SCHEDULER job every day or month depending on the growth of the audit trail We modify our DBV command rules to account for the PL/SQL package procedure We can leverage some of the patterns we have discussed so far, in particular an operating context factor that checks for the use of this package We would also want include a factor that verifies the package is running as part of a database job by calling the standard Oracle function SYS_CONTEXT( USERENV , BG_JOB_ID ) and verifying that the value returned is NOT NULL In Oracle database jobs this system context value is NOT NULL and for a foreground session (for example, SQL*Plus), the value is NULL
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