![]() We will add code to generate a new random key and store it along with other user authentication information.Īfter the usual passport.js and express.js setup, we add the necessary TotpStrategy: passport. In our example, the first step will be handled manually by us. ![]() You can find all the code from the following snippets here: app.js Step one: enrollment A user may also choose to use the Google Authenticator Chrome app. We will also require users to install Google Authenticator (or a similar app) to generate codes with their cellphone. In our example, the second step (the actual authentication) will be handled by passport-totp, a passport.js strategy that validates the user-entered TOTP code and requires access to the user-specific key. Adding TOTP to your Node.js applicationĪs you have seen in the previous chart, adding 2FA with TOTP to an application requires two independent steps. The client and the server need to synchronize their clocks, and the codes become invalid after a certain amount of time. This usually means that an "enrollment" step is necessary before making TOTP available in an application.Īnother important thing to keep in mind, as the name of the algorithm implies, the generated codes are time-dependent. This shared secret needs to be generated and then stored by both the client- and the server-side components of the system. Enrollment: enabling 2FA for a specific user.Īs you may have gathered from the chart above, the main requirement for TOTP to work is a shared secret.We will explore how to do so in the following sections, but first I'll give you a quick summary of TOTP and how it usually works in two steps: This application allows us to integrate TOTP easily into our developments. In particular, Google has developed an application that is freely available for Android, iOS and the web: Google Authenticator. ![]() There are many open-source implementations for both the client-side and server-side components. In the following paragraphs, we will explore one authentication method that has become popular for use as the second step in 2FA: the time-based one-time password algorithm (TOTP). In Google Authenticator app you can either scan a QR code or manually type a key provided by the issuer. Most applications make use of the usual username + password combination, though any two independent authentication methods may be combined. As you may have guessed, it works by providing an additional layer of authentication that is independent of the main layer. Two-factor authenticationĢFA has become quite popular. In this post, we will explore one of the most powerful (and easiest) ways of improving the security of your authentication process: two-factor authentication (2FA / MFA). Long gone are the days of applications that simply performed an action without getting any details about the identity of the user who performed the actions. Authentication has increasingly become an important part of all web applications and sites.
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