UBUNTU开启TELNET服务并设置root权限

1. sudo apt-get install xinetd telnetd 

2. 安装成功后，系统也会有相应提示（好象7.10才有，6.10就没看到）

sudo vi /etc/inetd.conf并加入以下一行 
telnet stream tcp nowait telnetd /usr/sbin/tcpd /usr/sbin/in.telnetd 
3. sudo vi /etc/xinetd.conf并加入以下内容： 
# Simple configuration file for xinetd 
# 
# Some defaults, and include /etc/xinetd.d/ 


defaults 
{ 


# Please note that you need a log_type line to be able to use log_on_success 
# and log_on_failure. The default is the following : 
# log_type = SYSLOG daemon info 


instances = 60 
log_type = SYSLOG authpriv 
log_on_success = HOST PID 
log_on_failure = HOST 
cps = 25 30 
} 


includedir /etc/xinetd.d 
4. sudo vi /etc/xinetd.d/telnet并加入以下内容： 
# default: on 
# description: The telnet server serves telnet sessions; it uses \ 
# unencrypted username/password pairs for authentication. 
service telnet 
{ 
disable = no 
flags = REUSE 
socket_type = stream 
wait = no 
user = root 
server = /usr/sbin/in.telnetd 
log_on_failure += USERID 
} 
5. 重启机器或重启网络服务sudo /etc/init.d/xinetd restart 

6、允许root用户telnet登录
       有两种方法：
       (1)输入命令：mv /etc/securetty /etc/securetty.bak
       (2)修改/etc/pam.d/login这个文件。只需将下面一行注释一下即可。 
           #auth required lib/security/pam_securetty.so