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Adding Google Authenticator to Ubuntu 14.04

In this article we will discuss and walk through an installation of the Google Authentication PAM module on Ubuntu Linux 14.04

Make sure your apt-get is up to date

sudo apt-get update

install the libpam google authenticator package

sudo apt-get install libpam-google-authenticator

login with the user you would like to force the authentication module and run the google-authenticator command.

TestMachine@TestUser:~$ google-authenticator

Follow the steps listed and make sure to be thoughtful when answering questions like login attempts, rate-limiting and such.

You will be given a QR code to scan with your phone (with the Authenticator app installed) this will setup OTPs for your two factor authentication.

We will now require Google Authenticator for SSH Logins:

open /etc/pam.d/sshd and add the following line to the file:

auth required

Next, open the /etc/ssh/sshd_config file, locate the ChallengeResponseAuthentication line, and change it to read as follows:

ChallengeResponseAuthentication yes

(If the ChallengeResponseAuthentication line doesn’t already exist, add the above line to the file. Finally, restart the SSH server so your changes will take effect:

sudo service ssh restart