centos 7 修改 sshd | 禁止 root 登录及 sshd 端口脚本定义
1.新建用户wwweee000
[root@localhost ~]# useradd wwweee000 [root@localhost ~]# 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"
[root@localhost ~]# cat -n /etc/ssh/sshd_config|grep "Port *" 17 #Port 22 100 #GatewayPorts no [root@localhost ~]# cat /etc/ssh/sshd_config|grep -n "Port *" 17:#Port 22 100:#GatewayPorts no [root@localhost ~]# 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.
[root@localhost ~]# cat /etc/ssh/sshd_config|grep -n "Port\ " 17:#Port 22 [root@localhost ~]# cat -n /etc/ssh/sshd_config|grep "Port\ " 17 #Port 22 [root@localhost ~]# cat /etc/ssh/sshd_config|grep -n "Port\ " 17:#Port 22 [root@localhost ~]# awk "/Port\ /" /etc/ssh/sshd_config #Port 22 [root@localhost ~]# sed -i "17s/#Port 22/Port 22/g" /etc/ssh/sshd_config [root@localhost ~]# 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
[root@localhost ~]# sed -i "17s/Port 22/Port 4096/g" /etc/ssh/sshd_config [root@localhost ~]# cat /etc/ssh/sshd_config|grep "Port\ " Port 4096
4.修改 #PermitRootLogin yes 为 PermitRootLogin no
[root@localhost ~]# cat -n /etc/ssh/sshd_config|grep "PermitRootLogin" 49 #PermitRootLogin yes 104 # the setting of "PermitRootLogin without-password". [root@localhost ~]# sed -i "49s/#PermitRootLogin yes/PermitRootLogin no/g" /etc/ssh/sshd_config [root@localhost ~]# cat -n /etc/ssh/sshd_config|grep "PermitRootLogin no" 49 PermitRootLogin no
5.重启sshd服务
[root@localhost ~]# systemctl restart sshd.service
6.使用 wwweee000 用户登录变化
[wwweee000@localhost ~]$
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
[root@localhost wwweee000]# firewall-cmd --state not running
[root@localhost ~]# 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
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