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SELECT and DML commands cannot use '%' for both the object owner and object name, and command rules for these commands cannot be applied for the SYS or DVSYS account DBV does not offer command rules for transaction control commands, as these commands are not security relevant nor do they operate on database objects By security relevant, we mean the commands do not change session user, change the current user, or give the session user any additional system or object privileges for the session Command rules cannot be defined on the ALTER DATABASE or ALTER SESSION commands The SET ROLE command is not directly supported, but the DBV Secure Application Role feature offers a mechanism to control the activation of a database role with a DBV rule set providing the decision point With the remaining command categories, more than 100 distinct commands can be controlled by the security administrator with DBV command rules
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One of the most powerful command rules available controls when accounts that have been granted specific roles can establish connections to the database This command rule uses a special DBV database operation named CONNECT that simply implies a command rule that authorizes a database connection once the standard authentication processing within Oracle has completed Using this command rule, we can offer higher levels of assurance around when and how (conditions) an account is able to connect to the database Let s consider MARY, our senior DBA for Sales History data, in an example Suppose the IT department wants to tighten the controls around database administrators connecting to the database The data and applications with which they are working are very sensitive The first step is to decide under what conditions MARY and other database administrators are allowed to perform administration tasks If the IT departments allow MARY VPN access to the corporate network, doesn t that mean she can be sitting in a coffee shop with a laptop viewing sensitive financial data VPN access is typically much less secure than access at the company s office building because the networks are more open to snooping and the environment is less secure from a physical perspective Who else has access to her laptop if she walks away from her computer to take a break Would the customers in the stored in the CUSTOMERS table approve of this access With DBV command rules, we can simply define a rule set that resolves whether the database session is being established from a machine that is physically located within the company s building(s) The IT department could establish a policy that mandates the use of a secure authentication method to all sensitive databases The Oracle Advanced Security option provides authentication methods based on Public Key Infrastructure (PKI)/Secure Sockets Layer (SSL) or Kerberos that could be leveraged The policy could also dictate that the credential stores used for
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this authentication could be limited (in deployment) to machines that are located in the company offices Once the policy is established, a level of trust can be established for all connections to the database The rule used in the DBV rule set would leverage the Oracle built-in, read-only application context USERENV that stores security-related attributes about the database session The rule can read the application context values using the PL/SQL function SYS_CONTEXT as follows:
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dbvowner@aos> BEGIN dbms_macadmcreate_rule( rule_name => 'Is Secure Authentication Method' , rule_expr => 'SYS_CONTEXT(''USERENV'', ''AUTHENTICATION_METHOD'') IN (''SSL'', ''KERBEROS'')' ); END; / PL/SQL procedure successfully completed
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Requiring PKI/SSL or Kerberos is a well-founded requirement because it establishes something a client might have, such as a certificate, and reduces password-based hacking This increases the assurance that the database access is from a machine physically located at the company The IT department will also need to account for database administrators working on the console of a database server by inspecting the client IP address of the session Console-based access to the database implies that the database session was not established through the Oracle database listener that enables remote connectivity to an Oracle database With remote database clients, the USERENV application context maintains the IP address of the client The second rule for the DBV rule set is then as follows:
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dbvowner@aos> BEGIN dbms_macadmcreate_rule( rule_name => 'Is Console Client' , rule_expr => 'SYS_CONTEXT(''USERENV'', ''IP_ADDRESS'') IS NULL' ); END; / PL/SQL procedure successfully completed
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With the rules defined for both remote database clients and console clients, we can configure the DBV rule set required for the DBV CONNECT command rule DBV includes a predefined DBV rule set named Allow Sessions that is intended for this usage For this example, we need to reconfigure the eval_options parameter of this DBV rule set to return TRUE if either rule is valid (a secure authentication method or a console-based client), and then associate the DBV rules to the DBV rule set The default configuration of the Allows Sessions DBV rule set is TRUE if all associated rules are valid
dbvowner@aos> -- Reconfigure the "eval_options" parameter to use dbvowner@aos> -- the "any rule true" algorithm dbvowner@aos> BEGIN dbms_macadmupdate_rule_set( rule_set_name =>'Allow Sessions', description =>'Rule set that controls the ability to create a session in the database',
Part II:
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