1，问题描述

Oracle默认账号是没有限制ip的，这样的隐患就在于，如果我知道了oracle账号用户名密码，我只要能连接到db，就可以对db进行操作，这样对于线上的db来说是很危险的，因为有些非dba人员，比如开发人员、测试人员一不小心误删除了线上的数据，就惨了，坑太大不敢看。所以查了查，找到一种办法，在一些重要的表上加触发器来限制用户对线上db的表的操作。

2，触发器编写

如果开全局的sql审计，消耗性能太大，不太合适，想来只有在某些重要的表上做限制，初步解决问题了。

1)  验证ip：(sys_context('userenv','ip_address')not in('192.168.120.211')

2)  验证用户名：selects.USERNAME into v_username from v$session s where s.audsid=(selectuserenv('SESSIONID') from dual) and rownum<2

3)  样例存储过程如下：

create or replace triggerpri_stu_test_limit

before update or delete or insert on stu.zzz_test

DECLARE

PRAGMA AUTONOMOUS_TRANSACTION;

v_username varchar2(200) default '';

BEGIN

select s.USERNAME into v_username from v$session s wheres.audsid=(select userenv('SESSIONID') from dual) and rownum<2;

IFdeleting

AND (sys_context('userenv','ip_address') not in('192.168.120.211')    OR 'stuuser' like v_username)

THEN

RAISE_APPLICATION_ERROR(-20001, 'can not delete the table ');

ELSIF inserting

AND (sys_context('userenv','ip_address') not in('192.168.120.211')    OR 'stuuser' like v_username)

THEN

RAISE_APPLICATION_ERROR(-20001, 'can not insert the table ');

ELSIF updating

AND (sys_context('userenv','ip_address') not in('192.168.120.211')    OR 'stuuser' like v_username)

THEN

RAISE_APPLICATION_ERROR(-20001, 'can not update the table ');

END IF;

END;

3，验证：

SQL>

SQL> insert into stu.zzz_testvalues(3,'zhuren33');

insert into stu.zzz_testvalues(3,'zhuren33')

ORA-20001: can not insert the table

ORA-06512: at"stuuser.PRI_STU_ACCT_LIMIT", line 18

ORA-04088: error during execution oftrigger 'stuuser.PRI_STU_ACCT_LIMIT'

SQL> commit;

Commit complete

SQL>

SQL> update stu.zzz_test setremark='zhuren33_up' where id=3;

update stu.zzz_test setremark='zhuren33_up' where id=3

ORA-20001: can not update the table

ORA-06512: at"stuuser.PRI_STU_ACCT_LIMIT", line 22

ORA-04088: error during execution oftrigger 'stuuser.PRI_STU_ACCT_LIMIT'

SQL> commit;

Commit complete

SQL>

SQL> delete from  stu.zzz_test where id=3;

delete from stu.zzz_test where id=3

ORA-20001: can not delete the table

ORA-06512: at"stuuser.PRI_STU_ACCT_LIMIT", line 14

ORA-04088: error during execution oftrigger 'stuuser.PRI_STU_ACCT_LIMIT'

SQL> commit;

Commit complete

SQL>

OK增删改都可以被限制住了，应该暂时解决了问题所在，后续还是有很多问题需要一起解决的。