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43.10. Google Authenticator - Android Apps on Google Play

		
#### ssh 二次认证

1) 安装依赖环境
yum install gcc wget pam-devel libpng-devel libtool

2) 安装二维码工具
yum install -y  qrencode

3) 安装 google_authenticator (EPEL repo)
yum install google-authenticator -y

4) setup
<1> Using command line switch to the user you want to setup Google 2-step verification for
[root@test23 src]# su root
<2>  Run the Google Authenticator script and answer yes (y) to all questions:
[root@test23 src]# google-authenticator
<3> 执行 google-authenticator 命令 会生成一张二维码 ,手机下载   google authenticator app  扫描上面的二维码(或者手动输入),这样就能实现 基于时间的 口令同步.同时在用户的家目录下 下面5个是万能钥匙   用一次少一个 .
<4> 设置 ssh 登陆认证方式,Edit the file /etc/pam.d/sshd,and add this line towards the top of the file:
# google authenticator 
auth required pam_google_authenticator.so
<5>Next, edit the file /etc/ssh/sshd_config ,and change the ChallengeResponseAuthentication value to yes so it looks something like:
# google authenticator 
ChallengeResponseAuthentication yes
<6> 重启 sshd 服务

#### 普通用户su到root用户二次认证

[root@test23 redhat]# cat /etc/pam.d/su
#%PAM-1.0
auth		sufficient	pam_rootok.so
# Uncomment the following line to implicitly trust users in the "wheel" group.
#auth		sufficient	pam_wheel.so trust use_uid
# Uncomment the following line to require a user to be in the "wheel" group.
#auth		required	pam_wheel.so use_uid
# google authenticator
auth required pam_google_authenticator.so
auth            include        system-auth
account		sufficient	pam_succeed_if.so uid = 0 use_uid quiet
account		include		system-auth
password	include		system-auth
session		include		system-auth
session		optional	pam_xauth.so

#### 普通用户su到root用户不需要输入系统密码认证

[root@test23 redhat]# cat /etc/pam.d/su
#%PAM-1.0
auth            sufficient      pam_rootok.so
# Uncomment the following line to implicitly trust users in the "wheel" group.
#auth           sufficient      pam_wheel.so trust use_uid
# Uncomment the following line to require a user to be in the "wheel" group.
#auth           required        pam_wheel.so use_uid
# google authenticator
auth            required        pam_google_authenticator.so
auth            [success=ignore default=1] pam_succeed_if.so user = root
auth            sufficient      pam_succeed_if.so use_uid user = redhat
auth            include         system-auth
account         sufficient      pam_succeed_if.so uid = 0 use_uid quiet
account         include         system-auth
password        include         system-auth
session         include         system-auth
session         optional        pam_xauth.so

其中:
auth            [success=ignore default=1] pam_succeed_if.so user = root
auth            sufficient      pam_succeed_if.so use_uid user = redhat
第一行的意思是 要 su 到哪个用户不需要输入密码
第二行的意思是 要从哪个用户 su 到一行时候才不要密码
由于 auth            required        pam_google_authenticator.so 这一行在前面,所有 本列中从 redhat su 到 root ,不需要输入 root 的系统密码, 但是需要输入 google 的动态口令.

如果说想指定和多用户 su 到 root 都不需要 root 密码,只需输入动态口令,有两种方式:

1)  把上面的两行改成如下
auth            [success=ignore default=1] pam_succeed_if.so user = root
auth            sufficient      pam_succeed_if.so use_uid user ingroup allowedpeople

意思是把 需要的普通用户都加入一个 allowedpeople 用户组里, 对该用户组授权!

2) 见下面是用 普通用户 sudo 到 root 用户不需要输入系统密码认证 

#### 普通用户 sudo 到 root 用户不需要输入系统密码认证


1) 切换到普通用户(redhat) 执行google-authenticator

2) 此普通用户(redhat)在 sudo 的配置文件为

redhat	ALL=(ALL)	/bin/su - root

3) 修改 sudo 的pam 文件如下
[root@test23 pam.d]# cat /etc/pam.d/sudo
#%PAM-1.0
# google authenticator
#auth       required      pam_radius_auth.so
auth 	   required 	pam_google_authenticator.so
#auth       include      system-auth
account    include      system-auth
password   include      system-auth
session    optional     pam_keyinit.so revoke
session    required     pam_limits.so

4) 普通用户通过 google 口令 sudo  到 root 用户
[redhat@test23 ~]$ sudo su - root
Verification code:
[root@test23 ~]#


另外一种方式 见 Radius