Totp two factor authentication3/17/2024 ![]() ![]() ![]() Launch the Google Authenticator app on your smartphone. ChallengeResponseAuthentication yesįinally, restart the SSH service to take new changes. ChallengeResponseAuthentication noĬhange it to “ yes“. Next, open the SSH configuration file ‘ /etc/ssh/sshd_config‘ and scroll down to find the line that says. auth required pam_google_authenticator.so nullok Open the PAM configuration file ‘ /etc/pam.d/sshd‘ and add the following line to the bottom of the file. Do you want to enable rate-limiting (y/n) y Generate Google Auth Tokens Configuring SSH to Use Google Authenticator in Linux By default, this limits attackers to no more than 3 login attempts every 30s. Do you want to do so (y/n) y 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. 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 me to update your "/root/.google_authenticator" file (y/n) y 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 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. ![]() Next, follow the setup wizard and in most cases type the answer as “ y” ( yes) as shown below. Your new secret key is: CYZF2YF7HFGX55ZEPQYLHOMĮnter code from app (-1 to skip): -1 Code confirmation skipped Your emergency scratch codes are: 83714291 53083200 80975623 57217008 77496339 Warning: pasting the following URL into your browser exposes the OTP secret to to use libqrencode to show QR code visually for scanning.Ĭonsider typing the OTP secret into your app manually. # google-authenticatorĭo you want authentication tokens to be time-based (y/n) y Write down these details somewhere, we will need the ‘secret key‘ later on to set up the Google Authenticator app.
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