With this kind of two-factor authentication, mere knowledge of username and password is insufficient to break into a user's account - the attacker also needs knowledge of the shared secret key or physical access to the device running the Authenticator app. The user runs the Authenticator app, which independently computes and displays the same password, which the user types in, authenticating their identity. The site then computes (but does not display) the required six-digit one-time password and asks the user to enter it. To log into a site or service that uses two-factor authentication and supports Authenticator, the user provides a username and password to the site. This secret key will be used for all future logins to the site. It must be set up for each site with which it is to be used: the site provides a shared secret key to the user over a secure channel, to be stored in the Authenticator app. The app is first installed on a smartphone to use Authenticator. Ĭurrent software releases are proprietary freeware. This source code also has not been updated in years. Likewise, the source code is also freely available for old versions of the Google Authenticator apps for iOS and BlackBerry. However, this fork has not been updated since 2020. Google provides Android, Wear OS, BlackBerry, and iOS versions of Authenticator.Īn official open-source fork of the Android app is available on GitHub. When logging into a site supporting Authenticator (including Google services) or using Authenticator-supporting third-party applications such as password managers or file hosting services, Authenticator generates a six- to eight-digit one-time password which users must enter in addition to their usual login details. It implements multi-factor authentication services using the time-based one-time password (TOTP specified in RFC 6238) and HMAC-based one-time password (HOTP specified in RFC 4226), for authenticating users of software applications. Google Authenticator is a software-based authenticator by Google. For a setup like this, using http is not recommended.Proprietary freeware (some versions were under Apache License 2.0) You may be able to combine two Directory configurations into one depending on your directory structure, just make sure both paths are covered by the same auhentication mechanism. Pay special attention to trailing slashes where present. If you change make sure to make corresponding changes in apache_credentials file. Replace path to apache_2fa with the full path of cloned repository, path to protected directory with the actual path of the site you are trying to protect. InstructionsĬlone the repository and install dependencies: Similarly, it is also possible to use the same code with slight modifications and the same approach to provide 2FA based on HMAC-based one-time password (HOTP) algorithm. Specific instructions are provided below for configuring two-factor authentication with mod_auth_digest, but the same code and approach can be used with different Apache authentication mechanisms with slight modifications. This method is transparent to underlying applications so it can be used for any Apache served web site whether it is static, dynamic (PHP, Django, Flask etc.) or pre-packaged (Wiki, CRM, CMS etc.). This repository provides necessary code and instructions to add two-factor authentication to basic Apache authentication. For more secure applications, it is often required to have an additional layer of authentication. Google Authenticator is an application that implements two-factor authentication services using the Time-based One-time Password Algorithm (TOTP).Īpache provides basic authentication mechanism with mod_auth_basic or mod_auth_digest. With 2FA an additional authentication mechanism is used, that is preferably performed out-of-band. In this case, the password is the single factor of authentication. Without 2FA, a user only enters username and password. Two-factor authentication also known as 2FA, adds an extra step to a basic authentication procedure. Apache Two-Factor (2FA) Authentication with Google Authenticator
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