Microsoft authentication strategy for remix-auth

npm install remix-auth-microsoft remix-auth remix-auth-oauth2

MicrosoftStrategy for Remix using Remix-Auth

The Microsoft strategy is used to authenticate users against an account on Microsoft Active Directory using Remix-Auth. This can be a work/school account or a personal Microsoft account, like Skype, Xbox and Outlook.com. It extends the OAuth2Strategy.

Supported runtimes

Runtime	Has Support
Node.js	✅
Cloudflare	✅

How to use

Create an OAuth application

Follow the steps on the Microsoft documentation to create a new App Registration. You should select Web as the platform, configure a Redirect URI and add a client secret.

If you want to support login with both personal Microsoft accounts and school/work accounts, you might need to configure the supported account types by editing the manifest file. Set `signInAudience` value to `MicrosoftADandPersonalMicrosoftAccount` to allow login also with personal accounts.

Change your redirect URI to https://example.com/auth/microsoft/callback or http://localhost:4200/auth/microsoft/callback if you run it locally.

Be sure to copy the client secret, redirect URI, Tenant ID and the Application (client) ID (under Overview) because you will need them later.

Install dependencies

npm install remix-auth-microsoft remix-auth remix-auth-oauth2

Create the strategy instance

// app/services/auth.server.ts
import { MicrosoftStrategy } from "remix-auth-microsoft";
import { Authenticator } from "remix-auth";
import { sessionStorage } from "~/services/session.server";

export let authenticator = new Authenticator<User>(sessionStorage); //User is a custom user types you can define as you want

let microsoftStrategy = new MicrosoftStrategy(
  {
    clientId: "YOUR_CLIENT_ID",
    clientSecret: "YOUR_CLIENT_SECRET",
    redirectUri: "https://example.com/auth/microsoft/callback",
    tenantId: "YOUR_TENANT_ID", // optional - necessary for organization without multitenant (see below)
    scope: "openid profile email", // optional
    prompt: "login", // optional
  },
  async ({ accessToken, extraParams, profile }) => {
    // Here you can fetch the user from database or return a user object based on profile
    // return {profile}
    // The returned object is stored in the session storage you are using by the authenticator

    // If you're using cookieSessionStorage, be aware that cookies have a size limit of 4kb
    // For example this won't work
    // return {accessToken, extraParams, profile}

    // Retrieve or create user using id received from userinfo endpoint
    // https://graph.microsoft.com/oidc/userinfo

    // DO NOT USE EMAIL ADDRESS TO IDENTIFY USERS
    // The email address received from Microsoft Entra ID is not validated and can be changed to anything from Azure Portal.
    // If you use the email address to identify users and allow signing in from any tenant (`tenantId` is not set)
    // it opens up a possibility of spoofing users!


    return User.findOrCreate({ id: profile.id });
  }
);

authenticator.use(microsoftStrategy);

See Microsoft docs for more information on scope and prompt parameters.

Applications with single-tenant authentication (no multitenant allowed)

If you want to allow login only for users from a single organization, you should add the tenantId attribute to the configuration passed to MicrosoftStrategy. The value of tenantId should be the Directory (tenant) ID found under Overview in your App Registration page.

You must also select Accounts in this organizational directory as Supported account types in your App Registration.

Setup your routes

// app/routes/login.tsx
export default function Login() {
  return (
    <form action="/auth/microsoft" method="post">
      <button>Login with Microsoft</button>
    </form>
  );
}

// app/routes/auth/microsoft.tsx
import type { ActionArgs } from "@remix-run/node";
import { authenticator } from "~/auth.server";
import { redirect } from "@remix-run/node";

export const loader = () => redirect("/login");

export const action = ({ request }: ActionArgs) => {
  return authenticator.authenticate("microsoft", request);
};

// app/routes/auth/microsoft/callback.tsx
import type { LoaderArgs } from "@remix-run/node";
import { authenticator } from "~/auth.server";

export const loader = ({ request }: LoaderArgs) => {
  return authenticator.authenticate("microsoft", request, {
    successRedirect: "/dashboard",
    failureRedirect: "/login",
  });
};

Add Session Storage

// app/services/session.server.ts
import { createCookieSessionStorage } from "@remix-run/node";

export let sessionStorage = createCookieSessionStorage({
  cookie: {
    name: "_session", // use any name you want here
    sameSite: "lax", // this helps with CSRF
    path: "/", // remember to add this so the cookie will work in all routes
    httpOnly: true, // for security reasons, make this cookie http only
    secrets: ["s3cr3t"], // replace this with an actual secret
    secure: process.env.NODE_ENV === "production", // enable this in prod only
  },
});

export let { getSession, commitSession, destroySession } = sessionStorage;