很多人都知道，Oracle的監聽器一直存在著一個安全隱患，假如不設置安全措施，那么能夠訪問的用戶就可以遠程關閉監聽器。

相關示例：

D:/>lsnrctl stop eygle

LSNRCTL for 32-bit Windows: Version 10.2.0.3.0 - PRoduction on 28-11月-2007 10:02:40

Copyright (c) 1991, 2006, Oracle.  All rights reserved.

正在連接到 (DESCRipTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)(PORT=1521))
(CONNECT_DATA=(SERVICE_NAME=eygle)))
命令執行成功
 

大家可以發現，此時缺省的監聽器的日志還無法記錄操作地址：

No longer listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=172.16.33.11)(PORT=1521)))
28-NOV-2007 09:59:20 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=)(USER=Administrator))(COMMAND=stop)
(ARGUMENTS=64)(SERVICE=eygle)(VERSION=169870080)) * stop * 0
 

為了更好的保證監聽器的安全，大家最好為監聽設置密碼：

[oracle@jumper log]$ lsnrctl     

LSNRCTL for linux: Version 9.2.0.4.0 - Production on 28-NOV-2007 10:18:17

Copyright (c) 1991, 2002, Oracle Corporation.  All rights reserved.

Welcome to LSNRCTL, type "help" for information.

LSNRCTL> set current_listener listener
Current Listener is listener
LSNRCTL> change_passWord
Old password:
New password:
Reenter new password:
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)(PORT=1521)))
Password changed for listener
The command completed successfully
LSNRCTL> set password
Password:
The command completed successfully
LSNRCTL> save_config
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)(PORT=1521)))
Saved LISTENER configuration parameters.
Listener Parameter File  /opt/oracle/product/9.2.0/network/admin/listener.ora
Old Parameter File  /opt/oracle/product/9.2.0/network/admin/listener.bak
The command completed successfully
 

在我們設置密碼后，遠程操作將會因缺失密碼而出現失敗：

D:/>lsnrctl stop eygle

LSNRCTL for 32-bit Windows: Version 10.2.0.3.0 - Production on 28-11月-2007 10:22:57
Copyright (c) 1991, 2006, Oracle.  All rights reserved.

正在連接到 (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)
(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=eygle)))
TNS-01169: 監聽程序尚未識別口令
 

注意：此時在服務器端或客戶端，都需要我們通過密碼來起停監聽器：

LSNRCTL> set password
Password:
The command completed successfully
LSNRCTL> stop
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)(PORT=1521)))
The command completed successfully
LSNRCTL> start
Starting /opt/oracle/product/9.2.0/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 9.2.0.4.0 - Production
System parameter file is /opt/oracle/product/9.2.0/network/admin/listener.ora
Log messages written to /opt/oracle/product/9.2.0/network/log/listener.log
Trace information written to /opt/oracle/product/9.2.0/network/trace/listener.trc
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=172.16.33.11)(PORT=1521)))

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias                    LISTENER
Version                  TNSLSNR for Linux: Version 9.2.0.4.0 - Production
Start Date                28-NOV-2007 10:22:23
Uptime                    0 days 0 hr. 0 min. 0 sec
Trace Level              support
Security                  ON
SNMP                      OFF
Listener Parameter File  /opt/oracle/product/9.2.0/network/admin/listener.ora
Listener Log File        /opt/oracle/product/9.2.0/network/log/listener.log
Listener Trace File      /opt/oracle/product/9.2.0/network/trace/listener.trc
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=172.16.33.11)(PORT=1521)))
Services Summary...
Service "eygle" has 1 instance(s).
  Instance "eygle", status UNKNOWN, has 1 handler(s) for this service...
Service "julia" has 1 instance(s).
  Instance "eygle", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
 

另外，ADMIN_RESTRICTIONS參數也是一個重要的安全選項，大家可以在 listener.ora 文件中設置 ADMIN_RESTRICTIONS_ 為 ON，此后所有在運行時對監聽器的修改都將會被阻止，所有對監聽器的修改都必須通過手工修改listener.ora文件才能順利完成。