Oracle Database Vault
Oracle Database Vault is a feature in Oracle Database that provides additional security controls and protection against insider threats. Oracle Database Vault allows you to restrict access to sensitive data and database operations, even for privileged users.
Here is an example of using Oracle Database Vault to create a realm and rule set:
BEGIN
DBMS_MACADM.CREATE_REALM(
realm_name => 'my_realm',
realm_type => DBMS_MACUTL.GENERIC_REALM,
description => 'My Realm'
);
DBMS_MACADM.ADD_REALM_AUTH('my_realm', 'my_user');
DBMS_MACADM.CREATE_RULE_SET(
rule_set_name => 'my_rule_set',
description => 'My Rule Set'
);
DBMS_MACADM.ADD_RULE_SET_MEMBER(
rule_set_name => 'my_rule_set',
rule_name => 'my_rule'
);
END;
/
CREATE OR REPLACE FUNCTION my_function (
p_param1 IN VARCHAR2,
p_param2 IN VARCHAR2
)
RETURN VARCHAR2
IS
BEGIN
DBMS_MACSEC.ENABLE_REALM('my_realm');
IF DBMS_MACSEC.IN_REALM('my_realm') THEN
RETURN 'Access Granted';
ELSE
RETURN 'Access Denied';
END IF;
END;
/
BEGIN
DBMS_MACADM.CREATE_RULE(
rule_name => 'my_rule',
rule_expr => 'my_function(p_param1, p_param2) = ''Access Granted''',
description => 'My Rule'
);
END;
/
This example creates a realm named "my_realm" and adds the "my_user" user to it. The example also creates a rule set named "my_rule_set" and adds a rule named "my_rule" to it. The rule calls a function named "my_function" that checks whether the current user is in the "my_realm" realm. If the user is in the realm, the function returns "Access Granted", otherwise it returns "Access Denied". Once the realm and rule set are created, you can use them to enforce security controls:
EXECUTE DBMS_MACADM.ADD_AUTH_TO_REALM('my_realm', 'my_user');
EXECUTE DBMS_MACSEC.DISABLE_REALM('my_realm');
EXECUTE DBMS_MACSEC.ENABLE_REALM('my_realm');
SELECT my_function('param1_value', 'param2_value') FROM DUAL;
These statements add the "my_user" user to the "my_realm" realm, disable and enable the realm, and call the "my_function" function to check whether the current user is in the realm. If the user is in the realm, the function returns "Access Granted", otherwise it returns "Access Denied".
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