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   <title>Freesoft Linux FAQ -- 如何禁止某个用户的telnet功能,同时他有ftp功能?</title>
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如何禁止某个用户的telnet功能,同时他有ftp功能?
<p>【 在 wavehand (冷血的温柔) 的大作中提到: 】
<br>:&nbsp; 假设你想把用户ftponly的telnet关掉,
<br>:&nbsp; 1)写一个shell script /bin/ftponly:
<br>:&nbsp; #!/bin/sh
<br>:&nbsp; /bin/cat &lt;&lt; XX
<br>:&nbsp; You can only use FTP on this computer,
<br>:&nbsp; but you may not use this account to login.
<br>:&nbsp; Connection will be closed in 10 seconds.
<br>:&nbsp; XX
<br>:&nbsp; /usr/bin/sleep 10
<br>:&nbsp; #end of ftponly
<br>:&nbsp; 2)把用户ftponly的shell设置成/bin/ftponly:
<br>:&nbsp; 到passwd文件,找到对应于ftponly的那行
<br>:&nbsp; ftponly:......:/home/ftponly:/bin/bash,把最后的
<br>:&nbsp; /bin/bash改为/bin/ftponly.
<br>:&nbsp; 3)把 /bin/ftponly 加入到 /etc/shells
<br>:&nbsp; /bin/bash
<br>:&nbsp; /bin/tcsh
<br>:&nbsp; /bin/csh
<br>:&nbsp; /bin/ash
<br>:&nbsp; /bin/zsh
<br>:&nbsp; /bin/ftponly
<br>:&nbsp; 就行了..
<p>--------------
<br>:&nbsp; : 假设你想把用户ftponly的telnet关掉,
<br>:&nbsp; : 1)写一个shell script /bin/ftponly:
<br>:&nbsp; : #!/bin/sh
<br>:&nbsp; : /bin/cat &lt;&lt; XX
<br>&nbsp;
<br>&nbsp;
<br>:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
~~
<br>:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
XX是随便的一个文件名?
<br>&nbsp;
<br>这里的XX是个标志,当ftponly试图telnet的时候,屏幕上将显示两个XX之间的内容,
<br>然后10秒以后切断connect.
<p>注：还应该用trap来屏蔽键盘中断吧！否则人家用Ctrl-Z......
<br>&nbsp;
<br>&nbsp;
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