系统中有个需求，需要把一个表里的信用卡号字段进行权限管理，大家讨论再三，说TDE不太好，因为需求希望能够让有些用户可以访问这个表，但是卡号字段读不到东西。有些用户可以直接读取该字段的内容。

 

我给了一个建议，使用VPD,基于列的VPD可以满足这样的需求。

以下是一个样例，供参考。

 

–create user and grant privileges

create user test identified by test;

grant connect,resource to test;

grant execute dbms_rls to test;

 

create user credit_test identified by oracle;

grant connect,resource to credit_test;

grant create synonym to credit_test;

 

–create samples tables

SQL> create table credit_card_test as select object_id card_id,object_name card_name,object_id card_pwd from all_objects ;

 

Table created.

 

SQL> select count(*) from all_objects;

 

  COUNT(*)

———-

      4876

 

 

SQL> select * from credit_card_test where rownum<10;

 

   CARD_ID CARD_NAME                        CARD_PWD

———- —————————— ———-

       258 DUAL                                  258

       259 DUAL                                  259

       311 SYSTEM_PRIVILEGE_MAP                  311

       313 SYSTEM_PRIVILEGE_MAP                  313

       314 TABLE_PRIVILEGE_MAP                   314

       316 TABLE_PRIVILEGE_MAP                   316

       317 STMT_AUDIT_OPTION_MAP                 317

       319 STMT_AUDIT_OPTION_MAP                 319

       605 MAP_OBJECT                            605

 

9 rows selected.

 

SQL> desc credit_card_test

Name                                      Null?    Type

—————————————– ——– —————————-

CARD_ID                                   NOT NULL NUMBER

CARD_NAME                                 NOT NULL VARCHAR2(30)

CARD_PWD                                  NOT NULL NUMBER

 

 

–create synonyms or roles using credit_test

create or replace synonym credit_card_test for test.credit_card_test;

 

 

–using test(table owner account)

–add_policy  create_rls.sql

exec  dbms_rls.add_policy(object_schema => ‘test’,object_name => ‘credit_card_test’,policy_name => ‘card_pwd_policy’,function_schema =>’test’,policy_function => ‘rls_encryption’,statement_types =>’select’,policy_type => dbms_rls.CONTEXT_SENSITIVE,sec_relevant_cols=>’card_pwd’,sec_relevant_cols_opt=>dbms_rls.all_rows);

 

–add function  create_rls_f.sql

create or replace function rls_encryption (p_owner in varchar2,p_obj in varchar2)

return varchar2

is  v_flag varchar2(1000);

begin

if(p_owner=USER ) then

v_flag:=null;

else

v_flag:=’1=2′;

end if;

return v_flag;

end;

 

–drop policy  drop_rls.sql

exec  dbms_rls.drop_policy(object_schema => ‘test’,object_name => ‘credit_card_test’,policy_name => ‘card_pwd_policy’);

 

 

SQL> @drop_rls.sql

 

PL/SQL procedure successfully completed.

 

SQL> @create_rls.sql

 

PL/SQL procedure successfully completed.

 

SQL> @create_rls_f.sql

 

Function created.

 

SQL> conn test/test

seConnected.

SQL> lect * from credit_card_test where rownum<10;

 

   CARD_ID CARD_NAME                        CARD_PWD

———- —————————— ———-

       258 DUAL                                  258

       259 DUAL                                  259

       311 SYSTEM_PRIVILEGE_MAP                  311

       313 SYSTEM_PRIVILEGE_MAP                  313

       314 TABLE_PRIVILEGE_MAP                   314

       316 TABLE_PRIVILEGE_MAP                   316

       317 STMT_AUDIT_OPTION_MAP                 317

       319 STMT_AUDIT_OPTION_MAP                 319

       605 MAP_OBJECT                            605

 

9 rows selected.

 

SQL> conn credit_test/oracle

Connected.

SQL> select * from credit_card_test where rownum<10;

 

   CARD_ID CARD_NAME                        CARD_PWD

———- —————————— ———-

       258 DUAL

       259 DUAL

       311 SYSTEM_PRIVILEGE_MAP

       313 SYSTEM_PRIVILEGE_MAP

       314 TABLE_PRIVILEGE_MAP

       316 TABLE_PRIVILEGE_MAP

       317 STMT_AUDIT_OPTION_MAP

       319 STMT_AUDIT_OPTION_MAP

       605 MAP_OBJECT

 

9 rows selected.