1、准备：
安装必须的包：yum install zlib zlib-devel openssl-devel pam-devel pam-krb5 krb5-devel krb5-libs pam-devel
下载：wget https://mirror.esc7.net/pub/OpenBSD/OpenSSH/portable/openssh-7.5p1.tar.gz

2、安装：
tar zxf openssh-7.5p1.tar.gz
cd openssh-7.5p1
./configure --prefix=/usr --sysconfdir=/etc/ssh --with-pam --with-zlib --with-ssl-dir=/usr --with-md5-passwords --mandir=/usr/share/man --with-kerberos5=/usr/lib64/libkrb5.so（防止出现Unsupported option GSSAPIAuthentication 和 Unsupported option GSSAPICleanupCredentials）
会出现以下提示：

PAM is enabled. You may need to install a PAM control file for sshd,otherwise password authentication may fail.Example PAM control files can be found in the contrib/ subdirectory cp /etc/init.d/sshd /etc/init.d/sshd_old cp /etc/pam.d/sshd /etc/pam.d/sshd_old cd openssh-7.5p1/contrib/redhat cp sshd.init /etc/init.d/sshd cp sshd.pam /etc/pam.d/sshd 修改/etc/ssh/sshd_config中 UsePAM yes make && make install3、重启sshd服务 service sshd restart ssh -V4、注：ssh升级后，默认关闭root远程登录，如果需要，请打开5、如果无法登录，请修改/etc/pam.d/sshd auth required pam_sepermit.so auth include password-auth account required pam_nologin.so account include password-auth password include password-auth # pam_selinux.so close should be the first session rule session required pam_selinux.so close session required pam_loginuid.so # pam_selinux.so open should only be followed by sessions to be executed in the user context session required pam_selinux.so open env_params session required pam_namespace.so session optional pam_keyinit.so force revoke session include password-auth