Possible Disable Password Authentication for Google Authenticator Linux SSH Logins
In this article, we will discuss the possibility of disabling password authentication for Google Authenticator Linux SSH logins. We will cover the key concepts related to this topic, including the setup of Google Authenticator on Linux and the potential issues that may arise.
Setup of Google Authenticator on Linux
Google Authenticator is a time-based one-time password (TOTP) algorithm that generates a six-digit code that is valid for 30 seconds. This code is used as a second factor of authentication, in addition to a password, to provide an extra layer of security for SSH logins on Linux.
To set up Google Authenticator on Linux, you will need to install the Google Authenticator package and then configure it for each user that will be using it. The following steps outline the process:
- Install the Google Authenticator package:
sudo apt-get install google-authenticator - Run the
google-authenticatorcommand and follow the prompts to configure the authenticator for your user account. - Add the following line to the
/etc/ssh/sshd\_configfile to enable Google Authenticator for SSH logins:ChallengeResponseAuthentication yes - Restart the SSH service:
sudo systemctl restart ssh
Disabling Password Authentication
Once you have set up Google Authenticator for SSH logins, you may want to disable password authentication to further increase the security of your Linux system. This can be done by setting the PasswordAuthentication option in the /etc/ssh/sshd\_config file to no and then restarting the SSH service.
However, it is important to note that disabling password authentication will prevent users from logging in using only a password. They will be required to enter a code generated by the Google Authenticator app on their mobile device.
Potential Issues
There are a few potential issues that may arise when disabling password authentication for Google Authenticator Linux SSH logins. For example, if a user loses access to their mobile device, they will not be able to log in using Google Authenticator. In this case, you will need to follow the steps outlined in the DigitalOcean tutorial to regain access to the account.
In this article, we have discussed the possibility of disabling password authentication for Google Authenticator Linux SSH logins. We have covered the key concepts related to this topic, including the setup of Google Authenticator on Linux and the potential issues that may arise. By following the steps outlined in this article, you can increase the security of your Linux system and protect it from unauthorized access.