监听器也有安全？Sure！在缺省的情况下，任意用户不需要使用任何密码即通过lsnrctl 工具对Oracle Listener进行操作或关闭，从而造成任意新的会话都将无法建立连接。在Oracle 9i 中Oracle监听器允许任何一个人利用lsnrctl从远程发起对监听器的管理。也容易导致数据库受到损坏。@H_502_1@
1. 未设定密码情形下停止监听@H_502_1@
LSNRCTL for Linux: Version 9.2.0.8.0 - Production on 26-JUN-2011 08:22:26
Copyright (c) 1991,2006,Oracle Corporation. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))
The command completed successfully
2. 重新启动监听并设置密码@H_502_1@
Copyright (c) 1991,Oracle Corporation. All rights reserved.
Welcome to LSNRCTL,type "help" for information.
LSNRCTL> set current_listener listener_demo92 -->设置当前监听器
Current Listener is listener_demo92
LSNRCTL> start -->启动过程也不需要任何密码,启动的详细信息省略
LSNRCTL> change_password -->使用change_password来设置密码
Old password:
New password:
Reenter new password:
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))
Password changed for listener_demo92
The command completed successfully
LSNRCTL> save_config -->注意此处的save_config失败
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))
TNS-01169: The listener has not recognized the password
LSNRCTL> set password -->输入新设定的密码验证
Password:
The command completed successfully
LSNRCTL> save_config -->再次save_config成功
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))
Saved listener_demo92 configuration parameters.
Listener Parameter File /oracle/92/network/admin/listener.ora
Old Parameter File /oracle/92/network/admin/listener.bak
The command completed successfully
-->增加密码之后可以看到listener.ora文件中有一条新增的记录，即密码选项(注：尽管使用了密码管理方式,仍然可以无需密码启动监听)
[oracle@test admin]$ more listener.ora
----ADDED BY TNSLSNR 26-JUN-2011 05:12:48---
PASSWORDS_listener_demo92 =
#--------------------------------------------</pre>3. 尝试未使用密码的情况下停止监听@H_502_1@
TNS-01169: The listener has not recognized the password -->收到错误信息，需要使用密码认证
4. 使用密码来停止监听@H_502_1@
5. save_config失败的问题@H_502_1@
-->应该先使用set password之后再save_config，则保存配置成功。
LSNRCTL> set password
Password:
The command completed successfully
/在Oracle 10g 中不会出现类似的问题，因为在10g中可以使用基于操作系统验证方式。listener将检测到如果用户属于dba组的成员，
将会被授予改变密码，保存配置以及停止监听等权限。 /
6. 配置listener.ora中ADMIN_RESTRICTIONS参数
@H_502_1@参数作用：
当在listener.ora文件中设置了ADMIN_RESTRICTIONS参数后，在监听器运行时，不允许执行任何管理命令，同时set命令将不可用
，不论是在服务器本地还是从远程执行都不行。此时对于监听的设置仅仅通过手工修改listener.ora文件，要使修改生效，只能
使用lsnrctl reload命令或lsnrctl stop/start命令重新载入一次监听器配置信息。
修改方法：
在listener.ora文件中手动加入下面这样一行
ADMIN_RESTRICTIONS_<监听器名> = ON@H_502_1@
下面是其它网友的补充：
@H_502_1@LSNRCTL> 1、添加LOCAL_OS_AUTHENTICATION_LISTENER = OFF之前@H_502_1@
Security ON: Password or Local OS Authentication@H_502_1@
2、添加LOCAL_OS_AUTHENTICATION_LISTENER = OFF之后@H_502_1@
Security ON: Password
Old password:
New password:
Reenter new password:
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=ecp-uc-db1)(PORT=1521)))
Password changed for LISTENER
The command completed successfully
LSNRCTL>
Password:
The command completed successfully
LSNRCTL>
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=ecp-uc-db1)(PORT=1521)))
Saved LISTENER configuration parameters.
Listener Parameter File /opt/oracle/product/10.2.0/db_1/network/admin/listener.ora
Old Parameter File /opt/oracle/product/10.2.0/db_1/network/admin/listener.bak
The command completed successfully
[oracle@ecp-uc-db1 admin]$ cat listener.ora
#—-ADDED BY TNSLSNR 10-JUN-2011 18:13:24—
#——————————————–
note：10g数据库上需要上添加（重启监听）
@H_502_1@
LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=ecp-uc-db1)(PORT=1521)))
TNS-01169: The listener has not recognized the password
LSNRCTL> stop
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=ecp-uc-db1)(PORT=1521)))
TNS-01169: The listener has not recognized the password
LSNRCTL>
The command completed successfully
LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=ecp-uc-db1)(PORT=1521)))
STATUS of the LISTENER
————————
Alias LISTENER
Version TNSLSNR for Linux: Version 10.2.0.4.0 – Production
Start Date 10-JUN-2011 18:15:49
Uptime 0 days 0 hr. 1 min. 16 sec
Trace Level off
Security ON: Password
SNMP OFF
Listener Parameter File /opt/oracle/product/10.2.0/db_1/network/admin/listener.ora
Listener Log File /opt/oracle/product/10.2.0/db_1/network/log/listener.log
Listening Endpoints Summary…
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ECP-UC-DB1)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC0)))
Services Summary…
Service “PLSExtProc” has 1 instance(s).
Instance “PLSExtProc”,status UNKNOWN,has 1 handler(s) for this service…
Service “ecp” has 1 instance(s).
Instance “ecp”,status READY,has 1 handler(s) for this service…
Service “ecpXDB” has 1 instance(s).
Instance “ecp”,has 1 handler(s) for this service…
Service “ecp_XPT” has 1 instance(s).
Instance “ecp”,has 1 handler(s) for this service…
The command completed successfully@H_502_1@