使用触发器和自治事务做了个DDL审计

目的：禁止对ZFPT用户的表执行ALTER TABLE的操作，并审计操作行为。

--创建ZFPTADM用户用于管理触发器

CREATE USER ZFPTADM IDENTIFIED BY ZFPTADMDEFAULT TABLESPACE ZFPT_CDATA TEMPORARY TABLESPACE ZFPT_TEMP;

--授予ZFPTADM用户创建会话、触发器、表、查询字典视图以及不限制空间的权限

GRANT CREATE SESSION,CREATE TRIGGER,CREATETABLE,UNLIMITED TABLESPACE,SELECT ANY DICTIONARY TO ZFPTADM;

--创建审计日志表

DROP TABLE ZFPTADM.ZFPT_DDL_LOGS PURGE;

CREATE TABLE ZFPTADM.ZFPT_DDL_LOGS (

TIMESTAMP VARCHAR2(32),

USERNAME VARCHAR2(32),

OSUSER VARCHAR2(32),

LOGONTIME VARCHAR2(32),

MACHINE VARCHAR2(64),

PROGRAM VARCHAR2(64),

ERRMSG VARCHAR2(4000));



COMMENT ON COLUMNZFPTADM.ZFPT_DDL_LOGS.TIMESTAMP IS '操作时间';

COMMENT ON COLUMNZFPTADM.ZFPT_DDL_LOGS.USERNAME IS '使用的DB用户';

COMMENT ON COLUMN ZFPTADM.ZFPT_DDL_LOGS.OSUSERIS '使用的OS用户';

COMMENT ON COLUMNZFPTADM.ZFPT_DDL_LOGS.LOGONTIME IS '回话登陆时间';

COMMENT ON COLUMNZFPTADM.ZFPT_DDL_LOGS.MACHINE IS '客户端';

COMMENT ON COLUMNZFPTADM.ZFPT_DDL_LOGS.PROGRAM IS '使用的工具';

COMMENT ON COLUMNZFPTADM.ZFPT_DDL_LOGS.ERRMSG IS '组装信息';

--创建触发器

CREATE OR REPLACE TRIGGERZFPTADM.ZFPTDDLMONITOR

BEFORE ALTER ON ZFPT.SCHEMA

DECLARE

PRAGMA AUTONOMOUS_TRANSACTION;

V_TIMESTAMP VARCHAR2(32);

V_USERNAME VARCHAR2(32);

V_OSUSER VARCHAR2(32);

V_LOGONTIME VARCHAR2(32);

V_MACHINE VARCHAR2(64);

V_PROGRAM VARCHAR2(64);

V_ERRMSG VARCHAR2(4000);



BEGIN

         --判断所操作的对象类型是否为TABLE类型，只有TABLE类型才需要审计和禁止，其他类型以来方行

         IF(ORA_DICT_OBJ_TYPE='TABLE')

         THEN

                   SELECTUSERNAME,MACHINE,OSUSER,PROGRAM,TO_CHAR(LOGON_TIME,'YYYY-MM-DD HH24:MI:SS'),TO_CHAR(SYSTIMESTAMP,'YYYY-MM-DD HH24:MI:SS')

                   INTOV_USERNAME,V_MACHINE,V_OSUSER,V_PROGRAM,V_LOGONTIME ,V_TIMESTAMP

                   FROMV$SESSION WHERE SID=(SELECT USERENV('SID') FROM DUAL);

                   V_ERRMSG:= '来自客户端【'||V_MACHINE||'】的OS用户【'||V_OSUSER||'】使用【'||V_PROGRAM||'】程序以DB用户【'||V_USERNAME||'】连接，对【'||ORA_DICT_OBJ_OWNER|| '.' || ORA_DICT_OBJ_NAME || ' 】对象执行了【'||ORA_SYSEVENT||'】操作！';

                   INSERTINTO  ZFPTADM.ZFPT_DDL_LOGS(TIMESTAMP,USERNAME,OSUSER,LOGONTIME,MACHINE,PROGRAM,ERRMSG)

                   VALUES(V_TIMESTAMP,V_USERNAME,V_OSUSER,V_LOGONTIME,V_MACHINE,V_PROGRAM,V_ERRMSG);

                   COMMIT;

                   RAISE_APPLICATION_ERROR(-20001,'注意：客户端【'||V_MACHINE||'】，OS用户为【'||V_OSUSER||'】，DB用户为【'||V_USERNAME||'】，你无权对【'||ORA_DICT_OBJ_OWNER || '.' || ORA_DICT_OBJ_NAME || ' 】对象执行【'||ORA_SYSEVENT||'】操作，已记录你的违规操作行为！');

         ENDIF;

END ;

/

--启用触发器就会继续审计，不能执行ALTER操作

ALTER TRIGGER ZFPTADM.ZFPTDDLMONITORENABLE;

--禁用触发器就会停止审计，可以执行ALERT操作

ALTER TRIGGER ZFPTADM.ZFPTDDLMONITORDISABLE;