CentosSSH使用Google Authenticator二次验证,

CentosSSH使用Google Authenticator二次验证,

CentOS安装所需组件：

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yum -y install mercurial pam-devel

安装Google Authenticator：

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#http://www.haiyun.me

wget --no-check-certificate https://google-authenticator.googlecode.com/files/libpam-google-authenticator-1.0-source.tar.bz2

tar jxvf libpam-google-authenticator-1.0-source.tar.bz2

cd libpam-google-authenticator-1.0

make

make install

SSH登录时调用google-authenticator模块，编辑：

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/etc/pam.d/sshd

第一行添加：

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auth required pam_google_authenticator.so

修改SSH配置文件：

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vim /etc/ssh/sshd_config

添加或修改以下内容：

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ChallengeResponseAuthentication yes

UsePAM yes

重启SSH：

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/etc/init.d/sshd restart

生成google-authenticator配置，运行：

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google-authenticator

Do 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@node1.www.haiyun.me%3Fsecret%3DABEXG5K6CVB56BXY

#此网址为生成的二维码，客户端扫描

Your new secret key is: www.haiyun.me

Your verification code is 582849

Your emergency scratch codes are:

30776626

14200155

80795568

23936997

21919909

#上面几行数字为应急码

Do you want me to update your "/root/.google_authenticator" file (y/n) y

#更新配置文件

Do 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) y

#禁止一个口令多用

By 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) n

#客户端与服务器时间误差

If 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) y

#次数限制

Android安装google-authenticator客户端，扫描添加上方网址的二维码，以后在登录服务器时输入账号密码的同时还需输入google-authenticator即时生成的验证码才能登录。

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ssh www.haiyun.me

Verification code:

Password: