1。 安裝telnet
yum -y install xinetd telnet-server
配置/etc/xinetd。d/telnet
cat > /etc/xinetd。d/telnet < service telnet { disable = yes flags = REUSE socket_type = stream wait = no user = root server = /usr/sbin/in。telnetd log_on_failure += USERID } EOF 配置telnet登入的終端型別 cat >> /etc/securetty < pts/0 pts/1 pts/2 pts/3 EOF 啟動telnet systemctl enable xinetd ——now systemctl enable telnet。socket ——now 2。 下載安裝包 wget http：//ftp。openbsd。org/pub/OpenBSD/OpenSSH/portable/openssh-8。8p1。tar。gz wget https：//www。openssl。org/source/openssl-1。1。1j。tar。gz ——no-check-certificate wget http：//www。zlib。net/zlib-1。2。12。tar。gz 3。 安裝zlib tar -zxvf zlib-1。2。12。tar。gz cd zlib-1。2。12 。/configure ——prefix=/usr/local/zlib make && make install 4。 安裝openssl tar -zxvf openssl-1。1。1j。tar。gz cd openssl-1。1。1j 。/config ——prefix=/usr/local/ssl -d shared make && make install echo ‘/usr/local/ssl/lib’ >> /etc/ld。so。conf ldconfig -v openssl version -a 5。 安裝openssh tar -zxvf openssh-8。8p1。tar。gz cd openssh-8。8p1 。/configure ——prefix=/usr/local/openssh ——with-zlib=/usr/local/zlib ——with-ssl-dir=/usr/local/ssl make && make install 配置檔案備份和修改 #sshd_config檔案修改 echo ‘PermitRootLogin yes’ >>/usr/local/openssh/etc/sshd_config echo ‘PubkeyAuthentication yes’ >>/usr/local/openssh/etc/sshd_config echo ‘PasswordAuthentication yes’ >>/usr/local/openssh/etc/sshd_config # 備份原有檔案，並將新的配置複製到指定目錄 mv /etc/ssh/sshd_config /etc/ssh/sshd_config。bak cp /usr/local/openssh/etc/sshd_config /etc/ssh/sshd_config mv /usr/sbin/sshd /usr/sbin/sshd。bak cp /usr/local/openssh/sbin/sshd /usr/sbin/sshd mv /usr/bin/ssh /usr/bin/ssh。bak cp /usr/local/openssh/bin/ssh /usr/bin/ssh mv /usr/bin/ssh-keygen /usr/bin/ssh-keygen。bak cp /usr/local/openssh/bin/ssh-keygen /usr/bin/ssh-keygen mv /etc/ssh/ssh_host_ecdsa_key。pub /etc/ssh/ssh_host_ecdsa_key。pub。bak cp /usr/local/openssh/etc/ssh_host_ecdsa_key。pub /etc/ssh/ssh_host_ecdsa_key。pub # 修改systemd引數（去掉Type或改為Type=simple） vim /usr/lib/systemd/system/sshd。service ［Unit］ Description=OpenSSH server daemon Documentation=man：sshd（8） man：sshd_config（5） After=network。target sshd-keygen。service Wants=sshd-keygen。service ［Service］ #Type=notify Type=simple EnvironmentFile=/etc/sysconfig/sshd ExecStart=/usr/sbin/sshd -D $OPTIONS ExecReload=/bin/kill -HUP $MAINPID KillMode=process Restart=on-failure RestartSec=42s ［Install］ WantedBy=multi-user。target 重啟sshd服務 systemctl daemon-reload systemctl restart sshd systemctl status sshd # 驗證是否升級成功 ssh -V