Now you have to set up SSH to take advantage of the new two-way authentication. By default, this limits attackers to no more than 3 login attempts every 30s.ĭo you want to enable rate-limiting (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 +-1min (window size of 3) to about +-4min (window size of 17 acceptable tokens). 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. 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) yīy default, tokens are good for 30 seconds. The example below shows you how to answer to set up a reasonably secure configuration. After the setup is complete, you’ll have to provide the random number generated by the authenticator application every time you connect to your server remotely. To add a new account, select the QR code shaped tool at the top on the app, and then scan the QR code. Open up the FreeOTP app on your mobile phone. You can find it in Google Play if you have an Android phone, or in the iTunes store for an Apple iPhone.Ī QR code is displayed on the screen. Install the authenticator application (FreeOTP) on your mobile phone. The recovery codes are the only way to access your server if you lose your mobile phone. The app provides you with a secret key, verification code, and recovery codes. The snippets below show you how to answer for a reasonably secure setup.ĭo you want authentication tokens to be time-based (y/n) yĭo you want me to update your "/home/user/.google_authenticator" file (y/n)? y The application presents you with a series of questions. $ sudo dnf install -y google-authenticator Install and set up Google Authenticatorįirst, install the Google Authenticator package on your server. There are numerous free applications for Android or IOS that work with TOTP and Google Authenticator. Google Authenticator is available by default in Fedora.įor your mobile phone, you can use any two-way authentication application that is compatible with TOTP. Google Authenticator is used as the server application. The Time-based One-time Password algorithm (TOTP) is the method shown in this article. You also need to provide the randomly generated number displayed by an authenticator application on a mobile phone. With two-factor authentication, you can’t connect to a server with just your SSH keys. Even if you disable passwords and only allow SSH connections using public and private keys, an unauthorized user could still gain access to your system if they steal your keys. That’s where two-factor authentication (2FA) comes in. Despite the fact that SSH is a secure way to connect remotely to a system, you can still make it even more secure. You will be asked to authenticate your identity using the configured 2FA method - Google Authenticator.Every day there seems to be a security breach reported in the news where our data is at risk. Once you complete the Google Authenticator setup, open a new browser/private window, and login into your Drupal site. You have successfully configured the Google Authenticator - 2FA method.
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