1.查看当前版本

ssh -V

2.安装 xinetd服务

yum -y install xinetd

3.安装telnet 服务端 客户端

yum -y install telnet telnet-server

4.启动

systemctl start xinetd

systemctl start telnet.socket

vim /etc/pam.d/remote ##注释一行，否则无法远程

5.防火墙

iptables -I INPUT -s 172.16.8.22 -ptcp --dport 23 -j ACCEPT

iptables -nL --line-number

iptables -D INPUT 1

6.下载安装包

wget https://mirrors.aliyun.com/pub/OpenBSD/OpenSSH/portable/openssh-9.2p1.tar.gz

  1. 装编译环境
    yum install -y pam* zlib* openssl-devel gcc make
    8\. 备份

cp -r /etc/ssh /tmp/

8.编译

./configure --prefix=/usr --sysconfdir=/etc/ssh --with-zlib --with-pam --without-openssl-header-check --with-ssl-dir=/usr/local/ssl --with-privsep-path=/var/lib/sshd

make

rpm -e --nodeps rpm -qa | grep openssh

rm -rf /etc/ssh/*

make install

10

cp -a /etc/init.d/sshd /etc/init.d/sshd20230725

cp -a contrib/redhat/sshd.init /etc/init.d/sshd

chkconfig sshd on

chkconfig --add sshd

systemctl enable sshd

systemctl restart sshd

systemctl stop xinetd

systemctl stop telnet.socket

服务器提示权限拒绝：

编辑文件

vim /etc/ssh/sshd_config

最后一行添加：

HostKeyAlgorithms ssh-rsa,ssh-dss

重启ssh服务

systemctl restart sshd