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GROUP BY db_user , action_name , object_schema || ''|| object_name ORDER BY db_user , action_name , object_schema || ''|| object_name ; SUBJECT -----------------ALAN_ANALYST ANTHONY DEB_DATA_MGR JRUSSEL JRUSSEL JRUSSEL JRUSSEL JRUSSEL MARY MARY MARY MARY OPS$APPSERVER_1 OPS$APPSERVER_1 PTUCKER PTUCKER PTUCKER PTUCKER PTUCKER 20 rows selected VERB -----------------DELETE EXECUTE PROCEDURE DELETE EXECUTE PROCEDURE INSERT SELECT SELECT SELECT DELETE DELETE EXECUTE PROCEDURE UPDATE DELETE EXECUTE PROCEDURE EXECUTE PROCEDURE INSERT SELECT SELECT SELECT OBJECT COUNT(*) -------------------- ---------SHCOSTS 1 SHSALES_TRANSCTION 2 SHCOSTS 1 SHSALES_TRANSCTION 4 SHCOSTS 1 SHCHANNELS 1 SHPRODUCTS 1 SHPROMOTIONS 1 SHCOSTS 1 SHSALES 1 SHSALES_TRANSCTION 2 SHCUSTOMERS 1 SHSALES 1 SHSALES_TRANSCTION 26 SHSALES_TRANSCTION 4 SHCOSTS 1 SHCHANNELS 1 SHPRODUCTS 1 SHPROMOTIONS 1
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With this initial Subject-Verb-Object-Conditions table in place, we can identify the most important transactions based on the following: The frequency of the transactions Interviews with application experts to identify transactions that are either critical to the integrity of the system or corporate assets such as a balance sheet
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We can start the analysis to determine the conditions that bound each of these important transactions We can develop DBV command rules for the types of transactions we uncovered in the query results once this final analysis of business conditions is completed
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Limiting the Availability of Extremely Sensitive Transactions
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To add a level of security to sensitive transactions, you can use a database feature called Oracle External Tables (OETs) OETs provide a way to limit the ability to execute sensitive transactions to an externally controlled decision point, similar to the directory-based example we used for the realm authorizations earlier OETs are read-only database tables that are based on information stored in flat files in the operating system Using an approach based on OETs allows you to create a file that is owned by an OS account (or OS role) other than the Oracle software owner account (oracle) The account needs only read access to the file The OS file will contain the information
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7: Applied Database Vault for Existing Applications
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that can be used to authorize or deny sensitive transactions The OS file owner is the only account that can update the file To implement this strategy, we use the root OS account to create a directory for the authorization file (/etc/dbv/external_authorizeconf) We will then configure the database to use the directory in the creation of the OET In addition, we will create a directory (/var/log/dbv) for the logs generated by the OET
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[root@node1 ~]# mkdir -p /etc/dbv [root@node1 ~]# mkdir -p /var/log/dbv
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Next we will set the permissions on these directories to allow Oracle to read the files that make up the OET and write to the supporting log file directory:
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[root@node1 [root@node1 [root@node1 [root@node1 [root@node1 ~]# ~]# ~]# ~]# ~]# touch chmod chown chmod chown /etc/dbv/external_authorizeconf -R 750 /etc/dbv -R root:dba /etc/dbv 750 /var/log/dbv oracle:dba /var/log/dbv
The next step is to create the Oracle directories and an OET that will be based on the file We can use our operational DBA role to create the directories and the DBVEXT account that contains extended DBV security capabilities for the OET object and supporting code:
jean_oper_dba@aos>-- create the directories jean_oper_dba@aos>CREATE OR REPLACE DIRECTORY dbv_dir AS '/etc/dbv'; Directory created jean_oper_dba@aos>CREATE OR REPLACE DIRECTORY dbv_dir_log AS '/var/log/dbv'; Directory created jean_oper_dba@aos>-- grant privileges to the DBVEXT user jean_oper_dba@aos>-- to use the directories jean_oper_dba@aos>GRANT READ ON DIRECTORY dbv_dir TO dbvext; Grant succeeded jean_oper_dba@aos>GRANT READ, WRITE ON DIRECTORY dbv_dir_log TO dbvext; Grant succeeded jean_oper_dba@aos>-- create an OET under the DBVEXT object-owner account jean_oper_dba@aos>CONNECT dbvext Enter password: Connected dvf@aos> CREATE TABLE external_authorize ( username VARCHAR2(30) , event VARCHAR2(30) , owner VARCHAR2(30) , object VARCHAR2(130) , status NUMBER )
Part II:
Oracle Database Vault
ORGANIZATION EXTERNAL (TYPE ORACLE_LOADER DEFAULT DIRECTORY dbv_dir_log ACCESS PARAMETERS ( RECORDS DELIMITED BY NEWLINE BADFILE 'dbv_authbad' DISCARDFILE 'dbv_authdis' LOGFILE 'dbv_authlog' FIELDS TERMINATED BY "," OPTIONALLY ENCLOSED BY '"' ( username CHAR(30) , event CHAR(30) , owner CHAR(30) , object CHAR(130) , status INTEGER EXTERNAL(6) ) ) LOCATION (DBV_DIR:'external_authorizeconf') ) REJECT LIMIT UNLIMITED / Table created
The decision concept around the OET is that we can model the Subject-Verb-Object portion of a security profile directly in the OET using the USERNAME/EVENT/OWNER and OBJECT columns and use the STATUS column as an indicator of TRUE(1) or FALSE(0) to allow the command The conditional aspect of our profile is satisfied by the file owner (root, in this example) controlling when the commands are authorized on any given object The table is empty at this point, but if we populate the underlying comma-separated-values (CSV) file as the root OS account we will see the data in the table
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