Enter the code generated by your authenticator app. The server will request a verification code. PasswordAuthentication noĪuthenticationMethods publickey,keyboard-interactive Verify the following options are set as shown, or add them if they don't exist. $ sudo nano /etc/ssh/sshd_configįind the line for ChallengeResponseAuthentication and set its value to yes. # common-authĮdit the SSH daemon configuration file. Comment out the following line by adding # to the beginning. auth required pam_google_authenticator.so nullokĭisable user password authentication. After all users have generated codes, you can remove the nullok option to require 2FA for everyone.
The nullok option allows users that have not yet generated a 2FA code to log in, while codes are required if the user has followed Step 2 above. $ sudo nano /etc/pam.d/sshdĪdd the following line to the bottom of the file. Public/private SSH keys are required for login, and 2FA will be enabled.Įdit your SSH PAM configuration file. These steps disable password authentication. If you need to reset your code, rerun the program. Store your emergency codes in a secure location. Important: Follow the instructions in your 2FA application to create a new entry with the QR code or secret key.
Authy desktop linux update#
The program will update your configuration files and display several values: -e 10 : Generate 10 emergency backup codes.A window size of 3 allows authentication with the token before and after the current token for clock skew. By default, tokens expire every 30 seconds. -w 3 : The window size of allowed tokens.-d : Do not allow reuse of previously used tokens.-f : Write the configuration to ~/.google_authenticator.You can run the program without command-line options for an interactive setup, or use the following options: $ google-authenticator -t -f -d -w 3 -e 10 -r 3 -R 30 Run the Google Authenticator setup program.
Note: Each user connecting to the server will perform these steps.
Authy desktop linux install#
$ sudo yum install google-authenticatorĬentOS, Rocky Linux, Alma Linux, VzLinux, and other RHEL Clones $ sudo apt-get install libpam-google-authenticator Ubuntu, Debian, and other apt-based Distributions Follow the instructions for your Linux distribution to install the Google Authenticator PAM module.
Log in to your Linux server as a non-root user with sudo access. Install the Google Authenticator PAM Module Popular choices are Google Authenticator, Microsoft Authenticator, Authy, and FreeOTP. You will also need a two-factor authenticator app. Configure SSH to allow access with an SSH key.We recommend the following best practices: Prerequisitesīefore you proceed with this guide, you need a deployed Linux cloud server.
Authy desktop linux how to#
This guide explains how to use the Google Authenticator PAM module for SSH and sudo authentication. 2FA is also known as multi-factor authentication, two-step verification, and two-step authentication. Two-factor authentication, or 2FA, confirms a user's identity via two different factors: something they know and something they have.
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