实例讲解Oracle监听口令及监听器安全

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2008-3-6

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很多人都知道，Oracle的监听器一直存在着一个安全隐患，假如不设置安全措施，那么能够访问的用户就可以远程关闭监听器。

相关示例：

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.

正在连接到 (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)(PORT=1521))
(CONNECT_DATA=(SERVICE_NAME=eygle)))
命令执行成功

大家可以发现，此时缺省的监听器的日志还无法记录操作地址：

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

为了更好的保证监听器的安全，大家最好为监听设置密码：

[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

在我们设置密码后，远程操作将会因缺失密码而出现失败：

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.

正在连接到 (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=172.16.33.11)
(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=eygle)))
TNS-01169: 监听程序尚未识别口令

注意：此时在服务器端或客户端，都需要我们通过密码来起停监听器：

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参数也是一个重要的安全选项，大家可以在 listener.ora 文件中设置 ADMIN_RESTRICTIONS_ 为 ON，此后所有在运行时对监听器的修改都将会被阻止，所有对监听器的修改都必须通过手工修改listener.ora文件才能顺利完成。

【责编:Zenghui】