centos 7 修改sshd | 禁止 root登录及sshd端口脚本定义

1.新建用户wwweee000

[[email protected] ~]# useradd wwweee000
[[email protected] ~]# passwd wwweee000
Changing password for user wwweee000.
New password:
BAD PASSWORD: The password is a palindrome
Retype new password:
passwd: all authentication tokens updated successfully.

2.#Port 22字段删掉,将22改为其他不被使用的端口,服务器端口最大可以开到65536.//注意Port是大写的"P"

[[email protected] ~]# cat -n /etc/ssh/sshd_config|grep "Port *"
    17  #Port 22
   100  #GatewayPorts no
[[email protected] ~]# cat /etc/ssh/sshd_config|grep -n "Port *"
17:#Port 22
100:#GatewayPorts no
[[email protected] ~]# awk "/Port */" /etc/ssh/sshd_config
#Port 22
#GatewayPorts no

上面还是不能满足输出结果：我们只要Port 22的答案.

[[email protected] ~]# cat /etc/ssh/sshd_config|grep -n "Port\ "
17:#Port 22
[[email protected] ~]# cat -n /etc/ssh/sshd_config|grep "Port\ "
    17  #Port 22
[[email protected] ~]# cat /etc/ssh/sshd_config|grep -n "Port\ "
17:#Port 22
[[email protected] ~]# awk "/Port\ /" /etc/ssh/sshd_config
#Port 22
[[email protected] ~]# sed -i "17s/#Port 22/Port 22/g" /etc/ssh/sshd_config
[[email protected] ~]# awk "/Port\ /" /etc/ssh/sshd_config
Port 22

-n显示行号；\反斜杠实质定义

3.不使用vi/vim进行修改Port 22 为 4096

[[email protected] ~]# sed -i "17s/Port 22/Port 4096/g" /etc/ssh/sshd_config
[[email protected] ~]# cat /etc/ssh/sshd_config|grep "Port\ "
Port 4096

4.修改 #PermitRootLogin yes 为 PermitRootLogin no

[[email protected] ~]# cat -n /etc/ssh/sshd_config|grep "PermitRootLogin"
    49  #PermitRootLogin yes
   104  # the setting of "PermitRootLogin without-password".
[[email protected] ~]# sed -i "49s/#PermitRootLogin yes/PermitRootLogin no/g" /etc/ssh/sshd_config
[[email protected] ~]# cat -n /etc/ssh/sshd_config|grep "PermitRootLogin no"
    49  PermitRootLogin no

5.重启sshd服务

[[email protected] ~]# systemctl restart sshd.service

6.使用 wwweee000 用户登录变化

[[email protected] ~]$ 

user普通用户不能编辑/etc/ssh/sshd_config，需要切换root才能编辑，切换root命令 ：  su

7.root进行运行，编写shell脚本。//脚本通用centos 7 （主要：sshd_config端口号定义输入对root登录禁止）

#!/bin/bash
sshd_Port=`cat /etc/ssh/sshd_config|grep "Port\ "`
echo "　　当前sshd端口：$sshd_Port"
read -ep "　　请输入sshd服务的连接端口Port （1-65536）；
　　请确保其他端口冲突和防火墙端口开放业务：" sshd_Port_read
echo "　　你输入的端口号：$sshd_Port_read"
sed -i "s/$sshd_Port/Port $sshd_Port_read/g" /etc/ssh/sshd_config
echo "　　已经设置端口为：`cat /etc/ssh/sshd_config|grep "Port\ "`"
sed -i "s/#PermitRootLogin yes/PermitRootLogin no/g" /etc/ssh/sshd_config
systemctl restart sshd.service
exit 0

运行测试（可循环使用）本次防火墙关闭/生产服务器都是关闭防火墙的

[[email protected] wwweee000]# firewall-cmd --state
not running

[[email protected] ~]# sh sshd_config_Port.sh
　　当前sshd端口：Port 22
　　请输入sshd服务的连接端口Port （1-65536）
　　请确保其他端口冲突和防火墙端口开放业务：4096
　　你输入的端口号：4096
　　已经设置端口为：Port 4096

各路大神，求带飞有什么建议敬请留言。QQ：861996013，李辉 。转载请注明，谢谢。

原文地址：https://www.cnblogs.com/huixst/p/11450707.html