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7: Applied Database Vault for Existing Applications
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The sensitive transactions query results also include several records for EXECUTE transactions on the SHSALES_TRANSACTION PL/SQL package We expected this result based on the examples we ve created in the past two chapters As you examine the query results for your own applications, you should ask the application experts whether the PL/SQL programs are the only interfaces (paths) for other more fundament commands such as INSERT, UPDATE, and DELETE If you find that certain PL/SQL programs fit this classification, you can create command rules for the INSERT, UPDATE, and DELETE commands that enforce the use of the PL/SQL program similar to the examples we created that depend on the DBMS_UTILITY package being part of the PL/SQL call stack
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Another form of operational context that you can mine from your audit trail is related to the sequence of statements that are issued to the database as part of a transaction If we consider the notional use case presented in 6 named Add Monthly Product Cost, portions of the audit trail records may look similar to the following:
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sys@aos>SELECT transactionid ,action_name ,object_schema ,object_name FROM aos_common_audit_trail WHERE object_schema = 'SH' AND action_name IN ( 'SELECT' ,'INSERT' ,'UPDATE' ,'DELETE' ) AND object_type = 'TABLE' AND extended_timestamp > sysdate - 1 ORDER BY extended_timestamp, transactionid; TRANSACTIONID ACTION_NAME OBJECT_SCHEMA ---------------- ------------- ------------SELECT SH SELECT SH SELECT SH 040015004E960000 INSERT SH 040015004E960000 UPDATE SH SELECT SH SELECT SH SELECT SH 0A0014001F950000 INSERT SH 0A0014001F950000 UPDATE SH SELECT SH SELECT SH SELECT SH 03000800FE940000 INSERT SH 03000800FE940000 UPDATE SH 15 rows selected
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OBJECT_NAME --------------PRODUCTS CHANNELS PROMOTIONS COSTS MONTHLY_COST_SUMMARY PRODUCTS CHANNELS PROMOTIONS COSTS MONTHLY_COST_SUMMARY PRODUCTS CHANNELS PROMOTIONS COSTS MONTHLY_COST_SUMMARY
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This audit trail records reveal a pattern that involves three SELECT statements, followed by an INSERT statement, and then an UPDATE statement on tables related to product costs We can assert that this sequence of statements constitute the normal context of the transaction You can then develop DBV factors that query the audit trail for the records to validate the correct sequence of statements It is possible that data other than the audit trail records exists, which you can use to perform this validation You can use these factors in your DBV rules to prevent direct INSERT or UPDATE statements on the cost-related table unless the proper transactional sequence can be verified This approach is similar to the types of controls you might find in an intrusion detection system (IDS) that performs pattern matching and anomaly detection
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Factors Based on Data or Events Stored Externally
The use of identity management information, when coupled with Oracle EUS, is one form of a DBV factor that is based on information stored externally Many Oracle database environments reach out to other systems on the same network to retrieve information for one purpose or another There is no reason you cannot use these external systems for event information that would be useful to your DBV security policy This information could be as simple as supplemental data about the current user that is not stored in an identity management infrastructure but is stored in a human resources system An advanced usage could even query a physical access system used by the company to determine whether the user swiped his or her access badge to get into the building at some point in the business day We can use several queries to determine whether a database relies on external system for information First, we can check for the dependency on the following types of PL/SQL routines by custom database application code: Oracle file-based APIs (UTL_FILE) Oracle network-based APIs (UTL_TCP, UTL_HTTP, DBMS_LDAP) Oracle Heterogeneous Services APIs (DBMS_HS_PASSTHROUGH)
We can perform this type of dependency check with the following query, and we see that an application such as HTML DB (APEX) 30 has dependencies on these external access APIs:
sys@aos>SELECT owner,name,type,referenced_name FROM dba_dependencies WHERE referenced_name IN ('UTL_FILE', 'UTL_TCP', 'UTL_HTTP', 'DBMS_LDAP', 'DBMS_HS_PASSTHROUGH') AND owner NOT IN ( 'SYS' ,'PUBLIC' ,'OLAPSYS' ,'ORDSYS' ,'ORDPLUGINS' ,'ORACLE_OCM' ,'MDSYS' ,'SYSMAN' ,'XDB' ,'WMSYS' ,'WKSYS' ) ORDER BY owner,name,type;
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