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Database Vault Fundamentals
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CONNECTION_TYPE AUTHENTICATION_METHO CLIENT_IP -------------------- -------------------- -------------------OTHER PASSWORD 10101010 1 row selected
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This example demonstrates how to create a security-relevant factor whose foundation is based on multiple (other) factors using a declarative method that required no PL/SQL programming The factors we used in this example are provided by the database kernel code, but your custom factors could also be used with this approach You can establish a multifactor security policy when these factors are used DBV rule sets or in your own PL/SQL code Consider the DBV CONNECT command rule example presented earlier In this example, two DBV rules were used to authorize a connection to the database The rules Is Secure Authentication Method and Is Console Client examined the authentication method and database client s IP address in a manner similar to the way that the Connection_Type factor is identified We can replace these two DBV rules with a single DBV rule, Is Trusted Client , to achieve the same result simply by checking for the factor Connection_Type not being OTHER , as shown in this example:
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dbvowner@aos> BEGIN dbms_macadmcreate_rule( rule_name => 'Is Trusted Client' , rule_expr => 'DVSYSGET_FACTOR(''Connection_Type'') <> ''OTHER''' ); END; / PL/SQL procedure successfully completed
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To demonstrate multifactor security within PL/SQL, we can create a VPD policy on the CUSTOMERS table in the Sales History (SH) schema In this policy, we will use the factor in the VPD policy function to provide either column-level or row-level security on the table First we need to grant a named account the ability to manage VPD policy The realm owner of the Sales History realm, MARY, is authorized to perform not only administration on objects in the SH object owner account, but she can also perform VPD policy administration on the objects The only step that is required to enable this VPD administration is to grant MARY execute privileges on the VPD administration package, SYSDBMS_RLS This package is protected by the Oracle Database Vault realm and requires the DV_OWNER role to grant the privilege
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dbvowner@aos> GRANT EXECUTE ON sysdbms_rls TO mary;
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MARY must first create the VPD policy function that will leverage our factor to provide row-level security on the SHCUSTOMERS table:
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mary@aos>CREATE OR REPLACE FUNCTION shcustomer_policy_function( schema_name IN VARCHAR2 , table_name IN VARCHAR2 ) RETURN VARCHAR2 AS BEGIN -- prevent access to sensitive customer data -- outside of the corporate network
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Part II:
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IF schema_name = 'SH' AND table_name = 'CUSTOMERS' THEN -- when the connection type factor is OTHER we know -- the database client has not connection from -- the corporate network IF DVSYSGET_FACTOR('CONNECTION_TYPE') = 'OTHER' THEN RETURN '1=0'; -- for all other connection types allow -- access to all rows ELSE RETURN '1=1'; END IF; END IF; END; / Function created
Next MARY can create a VPD policy using the DBMS_RLS package In this example policy, we will restrict just the ability to show sensitive columns such as date of birth, marital status, and income outside of the corporate network:
mary@aos> BEGIN dbms_rlsadd_policy( object_schema => 'SH' ,object_name => 'CUSTOMERS' ,policy_name => 'POLICY_CUSTOMERS' ,function_schema => 'SH' ,policy_function => 'CUSTOMER_POLICY_FUNCTION' || ,sec_relevant_cols => 'CUST_GENDER,CUST_YEAR_OF_BIRTH' || ',CUST_MARITAL_STATUS,CUST_INCOME_LEVEL,CUST_CREDIT_LIMIT' ,sec_relevant_cols_opt => dbms_rlsall_rows ); END; / PL/SQL procedure successfully completed
If MARY queries the SHCUSTOMERS table from within the corporate network, the security sensitive columns are visible:
mary@aos> -- show the Connection_Type factor and session context mary@aos>SELECT DVSYSGET_FACTOR('Connection_Type') Connection_Type , DVSYSGET_FACTOR('Authentication_Method') Authentication_Method , DVSYSGET_FACTOR('Client_IP') Client_IP FROM DUAL; CONNECTION_TYPE AUTHENTICATION_METHO CLIENT_IP -------------------- -------------------- -------------------CORPORATE_PASSWORD PASSWORD 1921680200 1 row selected
5:
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mary@aos> -- query the SHCUSTOMERS table mary@aos> SELECT cust_last_name , cust_year_of_birth , cust_marital_status , cust_income_level FROM shcustomers WHERE cust_state_province = 'TX' AND ROWNUM < 10 ORDER BY cust_last_name / CUST_LAST_ CUST_YEAR_OF_BIRTH CUST_MARIT CUST_INCOME_LEVEL ---------- ------------------ ---------- ------------------------Beiers 1982 single K: 250,000 - 299,999 Duval 1981 single H: 150,000 - 169,999 Greeley 1977 F: 110,000 - 129,999 Grover 1970 married D: 70,000 - 89,999 Hamilton 1961 single G: 130,000 - 149,999 Krider 1967 F: 110,000 - 129,999 Majors 1948 single G: 130,000 - 149,999 Rowley 1969 single H: 150,000 - 169,999 Stone 1978 single I: 170,000 - 189,999 9 rows selected
If MARY queries the SHCUSTOMERS table from outside the corporate network, the security sensitive columns are not visible and VPD will set them to NULL in the result set returned:
mary@aos> -- show the Connection_Type factor and session context mary@aos>SELECT DVSYSGET_FACTOR('Connection_Type') Connection_Type , DVSYSGET_FACTOR('Authentication_Method') Authentication_Method , DVSYSGET_FACTOR('Client_IP') Client_IP FROM DUAL; CONNECTION_TYPE AUTHENTICATION_METHO CLIENT_IP -------------------- -------------------- -------------------OTHER PASSWORD 10101010 1 row selected mary@aos> -- query the SHCUSTOMERS table mary@aos> SELECT cust_last_name , cust_year_of_birth , cust_marital_status , cust_income_level FROM shcustomers WHERE cust_state_province = 'TX' AND ROWNUM < 10 ORDER BY cust_last_name /
Part II:
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