CentOS升级OpenSSH版本

参考文档：

• Centos7升级openssh到最高版本 (opens new window)
• centos升级openssh版本 (opens new window)

网络相关

1. Centos安装telnet服务

   sudo yum -y install telnet*
   systemctl start xinetd.service
   systemctl start telnet.socket
   systemctl enable xinetd.service #开机启动
   systemctl enable telnet.socket #开机启动

2. 修改telnet server端口

   修改/usr/lib/systemd/system/telnet.socket中的stream端口
   在防火墙处也打开该端口。
   systemctl daemon-reload

3. 安装OpenSSH的依赖包

   yum install -y gcc gcc-c++ glibc make autoconf openssl openssl-devel pcre-devel pam-devel zlib* pam*

4. 将OpenSSH p版本 (opens new window)的放到服务器，进行编译。注意OpenSSH版本如果不带p则只是OpenBSD使用。

   sudo ./configure --prefix=/usr/local/openssh --sysconfdir=/etc/ssh --with-pam --with-ssl-dir=/usr/local/openssl --with-md5-passwords --mandir=/usr/share/man --with-zlib=/usr/local/zlib
   sudo make
   sudo yum remove openssh-*
   sudo chmod 600 /etc/ssh/ssh_host*
   sudo make install

5. 复制相应文件

   sudo cp ./contrib/redhat/sshd.init /etc/init.d/sshd
   sudo chkconfig --add sshd
   sudo cp /usr/local/openssh/sbin/sshd /usr/sbin/sshd
   sudo cp /usr/local/openssh/bin/ssh /usr/bin/ssh
   sudo cp /usr/local/openssh/bin/ssh-keygen /usr/bin/ssh-keygen

6. 添加服务

   service sshd restart
   systemctl start sshd.service
   systemctl enable sshd.service
   sshd -t