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
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
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
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.
