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[root@node1 ~] #echo "MARY,DELETE,SH,%,1" > /etc/dbv/external_authorizeconf
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In this example we model the concept that the USERNAME MARY is allowed (STATUS=1) to execute a DELETE (EVENT) on any (OBJECT) whose OWNER is SH If we attempt to update this file with the Oracle OS account, the OS file s permissions prevent the attempt:
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[oracle@node1 ~]$ echo "ANTHONY,DELETE,SH,%,1" > /etc/dbv/external_authorizeconf -bash: /etc/dbv/external_authorizeconf: Permission denied
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This is a simple example that makes use of the root and Oracle OS accounts Note that technologies such as fine-grained OS access control lists, based on IEEE s POSIX 1003 standards, would offer a solution that uses a non-root account as the file owner, but for brevity we simply used the root account With this file populated, we can now query the external table as the DBVEXT object-owner account and create a PL/SQL package that can be used in DBV rule sets:
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dvf@aos>-- query the populated OET dvf@aos>SELECT * FROM dbvextexternal_authorize;
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USERNAME EVENT OWNER OBJECT STATUS -------- -------- -------- -------- ---------MARY DELETE SH % 1 1 row selected dvf@aos>-- create a helper package for DBV Rule Sets that dvf@aos>-- can query the OET dvf@aos> CREATE OR REPLACE PACKAGE external_rule AS FUNCTION authorized( user_name IN VARCHAR2 , event_name IN VARCHAR2 , owner_name IN VARCHAR2 DEFAULT '%' , object_name IN VARCHAR2 DEFAULT '%' ) RETURN NUMBER; END; / Package created dvf@aos>CREATE OR REPLACE PACKAGE BODY external_rule AS FUNCTION authorized( user_name IN VARCHAR2 , event_name IN VARCHAR2 , owner_name IN VARCHAR2 , object_name IN VARCHAR2 ) RETURN NUMBER IS BEGIN FOR c_rules IN ( SELECT username FROM external_authorize WHERE UPPER(event) = UPPER(event_name) AND UPPER(owner) = UPPER(owner_name) AND UPPER(object) = UPPER(object_name) AND status = 1 ) LOOP IF UPPER(c_rulesusername) = UPPER(user_name) THEN RETURN 1; END IF; -- note that we could event use the package procedure -- DBVEXTDBMS_MAC_EXTENSIONUSER_HAS_ROLE here to base -- the authorization on role names store in CSV file END LOOP; RETURN 0; EXCEPTION WHEN OTHERS THEN RAISE_APPLICATION_ERROR(-20001, 'external_rule (error):' || SUBSTR(SQLERRM, 1 , 2000) ); -- RETURN 0; END;
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END; / Package body created dvf@aos>-- grant EXECUTE privilege on the package to DVSYS as always dvf@aos>GRANT EXECUTE ON dbvextexternal_rule TO dvsys; Grant succeeded
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Finally, we create the DBV rule set and an example DBV command rule that uses our OET-based package function
dvf@aos>CONNECT diego_dbvmgr Enter password: Connected diego_dbvmgr@aos>-- create the DBV Rule for DELETE on an SH objects diego_dbvmgr@aos>BEGIN dbms_macadmcreate_rule( rule_name => 'Externally Controlled DELETE for Sales History' ,rule_expr => 'DBVEXTEXTERNAL_RULEAUTHORIZED(DVSYSDV_LOGIN_USER,' || '''DELETE'',''SH'',''%'') = 1' ); END; / PL/SQL procedure successfully completed diego_dbvmgr@aos>-- create the DBV Rule Set and diego_dbvmgr@aos>-- associate our DBV Rule to it diego_dbvmgr@aos>BEGIN dbms_macadmcreate_rule_set( rule_set_name =>'Sales History DELETE Controls', description =>'Authorizes deletes against the Sales History tables', enabled =>dbms_macutlg_yes, eval_options =>dbms_macutlg_ruleset_eval_all, audit_options =>dbms_macutlg_ruleset_audit_fail, fail_options =>dbms_macutlg_ruleset_fail_show, fail_message =>NULL, fail_code =>NULL, handler_options =>dbms_macutlg_ruleset_handler_off, handler =>NULL); END; / PL/SQL procedure successfully completed diego_dbvmgr@aos>BEGIN dbms_macadmadd_rule_to_rule_set ( rule_set_name => 'Sales History DELETE Controls' , rule_name => 'Externally Controlled DELETE for Sales History' ); END; / PL/SQL procedure successfully completed diego_dbvmgr@aos>-- create the DBV Command Rule that ties into our OET authorizations
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diego_dbvmgr@aos>BEGIN dbms_macadmcreate_command_rule ( command => 'DELETE' ,rule_set_name => 'Sales History DELETE Controls' ,object_owner => 'SH' ,object_name => '%' ,enabled => 'Y' ); END; / PL/SQL procedure successfully completed
We can test the control using the realm administrator account MARY to verify that the DELETE command is allowed We can also verify that the DELETE command is not allowed for an EUSbased realm administrator such as JOE, who was authorized to do this based on the earlier realm authorization example
diego_dbvmgr@aos>CONNECT mary Enter password: Connected mary@aos>DELETE SHCOSTS WHERE ROWNUM < 2; 1 row deleted If we change the status mary@aos>CONNECT joe Enter password: Connected global_oid_tree1@aos>DELETE SHCOSTS WHERE ROWNUM < 2; DELETE SHCOSTS WHERE ROWNUM < 2 * ERROR at line 1: ORA-01031: insufficient privileges
We can also disable the ability for MARY to perform the sensitive transaction using the root OS account as follows:
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