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Database Vault Fundamentals
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CALL_STACK that returns the read-only PL/SQL call stack message that is maintained by (and secured in) the database kernel code If we embed the DBMS_UTILITY call within our SALES_ TRANSACTION procedure, we can see the information the FORMAT_CALL_STACK function provides:
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sh@aos>CREATE OR REPLACE PACKAGE BODY shsales_transaction AS PROCEDURE update_sales(customer in NUMBER, amount in NUMBER) IS BEGIN -- show the output of the DBMS_UTILITY function DBMS_OUTPUTPUT_LINE ( DBMS_UTILITYFORMAT_CALL_STACK ); -- perform the SQL UPDATE UPDATE shsales SET amount_sold = amount WHERE cust_id = customer; END; END; / Package body created sh@aos>-- enable DBMS_OUTPUT tracing sh@aos>-- SET SERVEROUT ON SIZE 10000 sh@aos>-- execute the procedure to sh@aos>-- show the DBMS_UTILITY capability sh@aos>BEGIN shsales_transactionupdate_sales( customer => 305 , amount => 200 ); END; /
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----- PL/SQL Call Stack ----object line object handle number name 0xa11a3ee0 5 package body SHSALES_TRANSACTION 0xa1e66428 2 anonymous block PL/SQL procedure successfully completed
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Note that embedding the DBMS_UTILITY call into your own code is not required to enable DBV command rule controls This was simply added to the trusted package to demonstrate the information maintained by the DBMS_UTILITY package while the trusted package is executing Armed with this useful information, we can add logic to our DBV rule set to search the read-only call stack information provided by the database kernel for the name of the procedure we trust for SQL UPDATE:
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dbvowner@aos> -- first lets create the conditional rule that dbvowner@aos> -- we are using the trusted sales transaction code dbvowner@aos>BEGIN dbms_macadmcreate_rule( rule_name => 'Called From Sales Transaction Package' , rule_expr => 'INSTR(UPPER(DBMS_UTILITYFORMAT_CALL_STACK), ''PACKAGE BODY SHSALES_TRANSACTION'') > 0' ); END; / PL/SQL procedure successfully completed dbvowner@aos> -- next create a rule set that will group our rules dbvowner@aos>BEGIN dbms_macadmcreate_rule_set( rule_set_name =>'Using Financials Application', description =>'Checks to verify commands are executed from trusted financials packages', 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 dbvowner@aos> -- associate the rule name to the rule set name dbvowner@aos>BEGIN dbms_macadmadd_rule_to_rule_set ( rule_set_name => 'Using Financials Application'
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5:
Database Vault Fundamentals
, rule_name => 'Called From Sales Transaction Package' ); END; / PL/SQL procedure successfully completed dbvowner@aos> -- finally create our Command Rule for UPDATE on SHSALES dbvowner@aos>BEGIN dbms_macadmcreate_command_rule ( command => 'UPDATE' ,rule_set_name => 'Using Financials Application' ,object_owner => 'SH' ,object_name => 'SALES' ,enabled => 'Y' ); END; / PL/SQL procedure successfully completed
If we test the UPDATE command as our Sales History realm owner, MARY, the command will fail unless she is using our trusted sales transaction package:
mary@aos> -- attempt the direct table update mary@aos> UPDATE shsales SET amount_sold = 200 WHERE cust_id = 305; UPDATE shsales * ERROR at line 1: ORA-01031: insufficient privileges mary@aos> -- attempt to use the trusted package mary@aos>BEGIN shsales_transactionupdate_sales( customer => 305 , amount => 200 ); END; / PL/SQL procedure successfully completed
The trusted PL/SQL package code issues the same type of SQL UPDATE statement MARY attempted from the SQL*Plus, but our DBV command rule is designed to allow only the SQL UPDATE statement when it comes from PL/SQL package code Our example leverages DBV rule sets to provide auditing and error-handling capabilities that we will explore in the next section
Commands Supported in Command Rules
Database commands within the Oracle database can be categorized as follows: SELECT A read-only query against a table or view, for example Data Manipulation Language Write actions such as INSERT, UPDATE, or DELETE against a table or view, for example, or EXECUTE actions on PL/SQL code
Part II:
Oracle Database Vault
Data Definition Language Database structure related commands that typically have the form CREATE <object type>, ALTER <object type>, and DROP <object type>, such as CREATE TABLE, ALTER TABLE, and DROP TABLE This category also includes privilege-related commands such as GRANT and REVOKE, auditing commands such as AUDIT and NOAUDIT, and data table administration commands such as ANALYZE, COMMENT, FLASHBACK, PURGE, RENAME, and TRUNCATE System control Session control Commands such as ALTER SYSTEM and ALTER DATABASE Commands such as ALTER SESSION and SET ROLE Commands such as COMMIT and ROLLBACK
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