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7: Applied Database Vault for Existing Applications
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, audit_options => ); dbms_macutlg_realm_audit_fail
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END; / PL/SQL procedure successfully completed diego_dbvmgr@aos>BEGIN dbms_macadmadd_object_to_realm ( realm_name => 'Sample DBV Application' ,object_owner => 'APP_OBJECT_OWNER' ,object_name => '%' ,object_type => '%' ); END; / PL/SQL procedure successfully completed diego_dbvmgr@aos>BEGIN dbms_macadmadd_auth_to_realm ( realm_name => 'Sample DBV Application' , grantee => 'APP_OBJECT_OWNER' , rule_set_name => NULL , auth_options => dbms_macutlg_realm_auth_owner); END; / PL/SQL procedure successfully completed
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Authorizing APP_OBJECT_OWNER as a participant in this realm is not a security concern because this account does not have system ANY privileges for SELECT, DML, or DDL that would allow the account to read, write, or modify objects protected by this realm, such as CTXSYS The account simply has system privileges that enable structural administration for objects that will be owned by the APP_OBJECT_OWNER account
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diego_dbvmgr@aos>CONNECT app_object_owner Enter password: Connected app_object_owner@aos>SELECT * FROM session_privs ORDER BY 1; PRIVILEGE ---------------------------------------CREATE CLUSTER CREATE INDEXTYPE CREATE OPERATOR CREATE PROCEDURE CREATE SEQUENCE CREATE SESSION CREATE TABLE CREATE TRIGGER CREATE TYPE 9 rows selected
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With the realm authorization in place, the object-owner account can now create and maintain the index and query the CUSTOMERS table using Oracle Text CONTAINS clause as follows:
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app_object_owner@aos>-- remove the invalid index created previously app_object_owner@aos>DROP INDEX app_object_ownercustomers_keyword_index; Index dropped app_object_owner@aos>-- create the new valid index app_object_owner@aos>CREATE INDEX app_object_ownercustomers_keyword_index ON app_object_ownercustomers(search_terms) INDEXTYPE IS CTXSYSCONTEXT PARAMETERS ('SYNC (ON COMMIT)'); Index created app_object_owner@aos>-- perform the keyword query app_object_owner@aos>SELECT SCORE(1) , first_name , last_name , street_address FROM app_object_ownercustomers WHERE state_province = 'TX' AND CONTAINS(search_terms, 'hospital', 1) > 0 ; SCORE(1) FIRST_NAME LAST_NAME STREET_ADDRESS ---------- ------------ ------------ -----------------------12 Blaine Fernandez 17 South Hospital Court 12 Emery Ryan 37 North Hospital Street 12 Ian Tansey 17 South Hospital Court 12 Chloe Bishop 37 North Hospital Street 4 rows selected
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As you can see, the authorization of the APP_OBJECT_OWNER in the Oracle Data Dictionary realm enables the successful creation of CTXSYSCONTEXT index types This approach is also required to enable the creation of CTXSYSCTXCAT and CTXSYSCTXRULE index types TIP Enable object-owner accounts in the Oracle Data Dictionary realm when using function-based indexes Make sure your object-owner accounts are not granted system ANY privileges that would cause a privilege escalation concern
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Oracle Spatial
Oracle Spatial is a database feature in the Oracle Enterprise Edition that provides advanced spatial features to support high-end geographic information system (GIS) and location-based services (LBS) The option can store complex vector-based geographic data such as points, lines, polygons, and even advanced geospatial data types such as raster (bitmap) formats for digital images Like Oracle Text, Oracle Spatial offers a rich set of Oracle operators to query geographic data to
7: Applied Database Vault for Existing Applications
discover spatial relationships, and these operators perform best when used with a special function-based index called a spatial index In addition to geographic data points, the Oracle Spatial option includes support for the Resource Description Framework (RDF) data standard for storing metadata about relationships between people, places, and objects, known as triples Spatial indexes and RDF indexes rely on the extensible indexing capability of the database in the same way Oracle Text indexes do, so attempting to create spatial indexes with DBV installed results in the same type of error we encountered with Oracle Text:
app_object_owner@aos>-- attempting to create a spatial index will fail app_object_owner@aos>-- with the default locked-down DBV policy app_object_owner@aos> CREATE INDEX app_object_ownercustomers_geo_index ON app_object_ownercustomers (geo_location) INDEXTYPE IS MDSYSSPATIAL_INDEX; CREATE INDEX app_object_ownercustomers_geo_index * ERROR at line 1: ORA-29855: error occurred in the execution of ODCIINDEXCREATE routine ORA-01031: insufficient privileges ORA-06512: at "MDSYSSDO_INDEX_METHOD_10I", line 10
To enable index creation with the MDSYSSPATIAL_INDEX index type, add the application s object-owner account (APP_OBJECT_OWNER) as a participant of the Oracle Data Dictionary realm This index type supports both vector-based and raster-based geographic formats This approach is also required for indexes that are created with the MDSYSSEM_INDEXTYPE index type in support of Oracle RDF capability TIP You will need to drop function-based indexes before issuing a DROP TABLE on a table protected by a realm The underlying database kernel will issue DROP INDEX statements that will result in realm violations if you do not first remove the indexes One interesting integration approach for DBV and Oracle Spatial is centered around the Spatial operator SDO_RELATE and its mask, min_resolution, and max_resolution parameters These parameters control how many results are returned when used with the operator in a SQL WHERE clause They can be used as a security control, much like row-level security We could define a set of DBV factors that assert the values of these parameters for any given session The actual values of the control factors could be based on other factors such as the Connection_Type example presented in 5 Using this approach, you might reduce the resolution of imagery or types of geographic intersection matches that are supported when a session has a connection type with less trust (such as OTHER) compared to a session whose connection type has a greater level of trust (such as CORPORATE_SSL)
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