修改ssh登录的banner信息

#查看banner信息配置文件
root@redis04:~# cat /etc/motd
 ----------
< zyjsuper >
 ----------
    \
     \
                                   .::!!!!!!!:.
  .!!!!!:.                        .:!!!!!!!!!!!!
  ~~~~!!!!!!.                 .:!!!!!!!!!UWWW$$$ 
      :$$NWX!!:           .:!!!!!!XUWW$$$$$$$$$P 
      $$$$$##WX!:      .<!!!!UW$$$$"  $$$$$$$$# 
      $$$$$  $$$UX   :!!UW$$$$$$$$$   4$$$$$* 
      ^$$$B  $$$$\     $$$$$$$$$$$$   d$$R" 
        "*$bd$$$$      '*$$$$$$$$$$$o+#" 
             """"          """"""" 

#设置成yes则显示mtod文件中设置的banner信息。
root@redis04:~# grep Motd /etc/ssh/sshd_config 
PrintMotd no   


#安装自定义banner的工具
root@redis04:~# apt install -y figlet cowsay

#显示cowsay命令支持的自带模板
root@redis04:~# /usr/games/cowsay -l  
Cow files in /usr/share/cowsay/cows:
apt bud-frogs bunny calvin cheese cock cower daemon default dragon
dragon-and-cow duck elephant elephant-in-snake eyes flaming-sheep fox
ghostbusters gnu hellokitty kangaroo kiss koala kosh luke-koala
mech-and-cow milk moofasa moose pony pony-smaller ren sheep skeleton
snowman stegosaurus stimpy suse three-eyes turkey turtle tux unipony
unipony-smaller vader vader-koala www


#使用指定的模板显示自定义的文字信息
root@redis04:~# /usr/games/cowsay -f eyes zyjsuper
 __________
< zyjsuper >
 ----------
    \
     \
                                   .::!!!!!!!:.
  .!!!!!:.                        .:!!!!!!!!!!!!
  ~~~~!!!!!!.                 .:!!!!!!!!!UWWW$$$ 
      :$$NWX!!:           .:!!!!!!XUWW$$$$$$$$$P 
      $$$$$##WX!:      .<!!!!UW$$$$"  $$$$$$$$# 
      $$$$$  $$$UX   :!!UW$$$$$$$$$   4$$$$$* 
      ^$$$B  $$$$\     $$$$$$$$$$$$   d$$R" 
        "*$bd$$$$      '*$$$$$$$$$$$o+#" 
             """"          """"""" 


#将自定义的banner信息加入到.bashrc文件中
root@redis04:~# grep cowsay ~/.bashrc
/usr/games/cowsay -f eyes zyjsuper


#重新编译openssh，自定义openssh的版本信息

root@redis04:~# apt install libssl-dev zlib1g-dev

root@redis04:~# wget https://ftp.riken.jp/pub/OpenBSD/OpenSSH/portable/openssh-8.1p1.tar.gz

root@redis04:~# tar zxvf openssh-8.1p1.tar.gz && cd openssh-8.1p1

root@redis04:~/openssh-8.1p1# sed -i 's/OpenSSH_8.1/OpenSSH_9.0/g' version.h 

root@redis04:~# ./configure && make install 

root@redis04:~# systemctl restart sshd