1.手机app下载谷歌身份验证器
2.配置本地yum源
yum -y install git automake libtool pam-devel bzip2 wget vim ntpdate3.校对时间
timedatectl set-timezone Asia/Shanghai
ntpdate cn.pool.ntp.org4.下载工具包
wget http://repository.timesys.com/buildsources/l/libpam-google-authenticator/libpam-google-authenticator-1.0/libpam-google-authenticator-1.0-source.tar.bz25.解压
tar -xf libpam-google-authenticator-1.0-cource.tar.bz2
6.编译安装
cd libpam-google-authenticator-1.0
make
make install7.修改ssh服务配置
echo "auth required pam_google_authenticator.so" >> /etc/pam.d/sshdvim /etc/ssh/sshd_config将ChallengeResponseAuthentication no
改为ChallengeResponseAuthentication yes重启sshd服务systemctl restart sshd8.使用令牌工具生成登录密钥
（会生成一个二维码，使用一开始下载的app扫描，绑定用户获取动态码）
google-authenticatorDo you want authentication tokens to be time-based (y/n) y
https://www.google.com/chart?chs=200x200&chld=M|0&cht=qr&chl=otpauth://totp/root@localhost.localdomain%3Fsecret%3DWLJCY4JSNGQNH454
Your new secret key is: WLJCY4JSNGQNH454
Your verification code is 635811
Your emergency scratch codes are:1826391256060832395718222056963990543013Do you want me to update your "/root/.google_authenticator" file (y/n) yDo you want to disallow multiple uses of the same authentication
token? This restricts you to one login about every 30s, but it increases
your chances to notice or even prevent man-in-the-middle attacks (y/n) yBy default, tokens are good for 30 seconds and in order to compensate for
possible time-skew between the client and the server, we allow an extra
token before and after the current time. If you experience problems with poor
time synchronization, you can increase the window from its default
size of 1:30min to about 4min. Do you want to do so (y/n) yIf the computer that you are logging into isn't hardened against brute-force
login attempts, you can enable rate-limiting for the authentication module.
By default, this limits attackers to no more than 3 login attempts every 30s.
Do you want to enable rate-limiting (y/n) n
)
