不容许实践别的保管命令

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。

  1. 未设定密码情形下停止监听
[oracle@test ~]$ lsnrctl stop listener_demo92  -->停止监听,可以看出不需要任何密码即可停止 

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 
  1. 重新启动监听并设置密码
[oracle@test ~]$ lsnrctl                                                 

LSNRCTL for Linux: Version 9.2.0.8.0 - Production on 26-JUN-2011 08:24:09                         
Copyright (c) 1991, 2006, 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 =                                               
 #--------------------------------------------
  1. 尝试未使用密码的情况下停止监听
[oracle@test ~]$ lsnrctl stop listener_demo92                        
LSNRCTL for Linux: Version 9.2.0.8.0 - Production on 26-JUN-2011 06:09:51          
Copyright (c) 1991, 2006, Oracle Corporation. All rights reserved.             

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))         
TNS-01169: The listener has not recognized the password  -->收到错误信息,需要使用密码认证
  1. 使用密码来停止监听
[oracle@test ~]$ lsnrctl                            
LSNRCTL> set current_listener listener_demo92                 
Current Listener is listener_demo92                      
LSNRCTL> stop                                 
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))   
TNS-01169: The listener has not recognized the password            
LSNRCTL> set password                             
Password:                                   
The command completed successfully                       
LSNRCTL> stop                                 
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))   
The command completed successfully                       
LSNRCTL> status                                
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))   
TNS-12541: TNS:no listener                           
 TNS-12560: TNS:protocol adapter error                     
 TNS-00511: No listener                            
  Linux Error: 111: Connection refused                    
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC)))       
TNS-12541: TNS:no listener                           
 TNS-12560: TNS:protocol adapter error                     
 TNS-00511: No listener                            
  Linux Error: 2: No such file or directory                  
  1. save_config失败的问题
-->在 Oracle 9i中,使用save_config命令将会失败                                     
 LSNRCTL> save_config                                                 
 Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=<hostname>)(PORT=<port>)))                  
 TNS-01169: The listener has not recognized the password                                

-->应该先使用set password之后再save_config,则保存配置成功。                              
 LSNRCTL> set password                                                
 Password: <the password you chose>                                          
 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

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

下面是其它网友的补充:

LSNRCTL> change_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> set password
Password:
The command completed successfully
LSNRCTL> save_config
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—
PASSWORDS_LISTENER = 6D7AA003392C436A
#——————————————–
note:10g数据库上需要上添加(重启监听)
LOCAL_OS_AUTHENTICATION_LISTENER =
OFF

1、添加LOCAL_OS_AUTHENTICATION_LISTENER = OFF之前

Security ON: Password or Local OS Authentication

2、添加LOCAL_OS_AUTHENTICATION_LISTENER = OFF之后

Security ON: Password
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> set password 123456
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”, status READY, has 1 handler(s) for this service…
Service “ecp_XPT” has 1 instance(s).
Instance “ecp”, status READY, has 1 handler(s) for this service…
The command completed successfully

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