触发器限制指定IP访问oracle数据库

触发器限制指定IP访问oracle数据库

---------------------来自德哥的BLOG，觉着很有用，记录一下-------------------

最近有个项目需要限制某些数据库用户的访问来源IP，在PG中比较好实现，但是ORACLE没有比较简便的操作。

如果不管用户的话，仅仅限制来源IP对监听的访问是比较容易实现的，通过配置数据库服务器的sqlnet.ora文件或者修改数据库服务器的IPTABLES等手段实现。

sqlnet.ora范例:

tcp.validnode_checking=yes

tcp.invited_nodes=(172.16.33.11,172.16.34.89)

iptables范例:

[root@kefu ~]# cat /etc/sysconfig/iptables

# Firewall configuration written by system-config-securitylevel

# Manual customization of this file is not recommended.

*filter

:INPUT ACCEPT [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

:RH-Firewall-1-INPUT - [0:0]

-A INPUT -j RH-Firewall-1-INPUT

-A FORWARD -j RH-Firewall-1-INPUT

# 允许访问1521的服务器

-A RH-Firewall-1-INPUT -s 172.16.3.68/32 -m state --state NEW -m tcp -p tcp --dport 1521 -j ACCEPT

-A RH-Firewall-1-INPUT -i lo -j ACCEPT

-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT

-A RH-Firewall-1-INPUT -p 50 -j ACCEPT

-A RH-Firewall-1-INPUT -p 51 -j ACCEPT

-A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT

-A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT

-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT

-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT

-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited

COMMIT

下面来看看如何限制特定用户和特定IP：

1. 创建ACL表 (本例将ACL表建立在dsm用户下,随便建哪里都可以)

create table dsm.tbl_iplimit (logonuser varchar2(32),ip_address varchar2(15),remark varchar2(64),create_time date default sysdate);

insert into dsm.tbl_iplimit values ('DSM','172.16.18.81','digoal''s host.',sysdate);

insert into dsm.tbl_iplimit values ('DSM','local','本地',sysdate);

commit;

这里限制了DSM用户只能从172.16.18.81和ORACLE所在服务器登录.其他用户不受限制.

2. 创建触发器

conn / as sysdba

create or replace trigger "logon_audit" after

logon on database

declare

record_num number;

userip varchar2(15);

isforbidden boolean:=true;

begin

  userip:=nvl(sys_context ('userenv','ip_address'),'local');

  select count(*) into record_num from dsm.tbl_iplimit where logonuser=user;

  if (record_num>0) then

      select count(*) into record_num from dsm.tbl_iplimit where logonuser=user and ip_address=userip;

      if (record_num=0) then

      raise_application_error(-20003,'ip :'||userip||' is forbided');

      end if;

  end if;

exception

 when value_error then

  sys.dbms_output.put_line('exception handed');

 when others then

  raise;

end logon_audit;

/