How do you restrict Google Sign-in (Oauth2) to emails from a specific Google Apps domain for Flask WebApp?

Question

Development of the Flask application (Python3 / Heroku) for the internal use of the company and the successful implementation of Google Login (Oauth2) based on the article brijieshb42 , which uses requests_oauthlib.

The study showed that if I pass the parameter “hd” (hosted domain) in my authorization URL, it should do the trick. For example.

https://accounts.google.com/o/oauth2/auth?response_type=code&client_id=OUR_CLIENT_ID&redirect_uri=https%3A%2F%2FOUR_APP.herokuapp.com%2Fconnect&scope=profile+email&state=STATE & hd = our_google_apps_domain.com & access_type = offline

Based on my understanding, this parameter should provide a client-side restriction and only allow logging in from our Google Apps domains (from the server I will contact after that!) Based on Google Documentation , this mailing list, and these stackoverflow messages: post1 , post2 .

However, although my code generates the authorization URL that I pasted above, I can log in with my personal gmail account (@ gmail.com vs @our apps domain.com).

Can someone shed some light on why this is not working? Or suggest a different approach? Basically, they would prefer to prohibit inactive employees from entering the system.

, brijeshb42 :

OAuth2Session(
  OUR_CLIENT_ID,
  redirect_uri=https://OUR_APP.herokuapp.com/connect,
  scope=['profile', 'email']).authorization_url(
      https://accounts.google.com/o/oauth2/auth,
      hd='our_google_apps_domain.com',
      access_type='offline')

URL- auth, !

Answer 1

. , . .

@app.route('/gCallback')
def callback():
    # Redirect user to home page if already logged in.
    if current_user is not None and current_user.is_authenticated():
        return redirect(url_for('index'))
    if 'error' in request.args:
        if request.args.get('error') == 'access_denied':
            return 'You denied access.'
        return 'Error encountered.'
    if 'code' not in request.args and 'state' not in request.args:
        return redirect(url_for('login'))
    else:
        # Execution reaches here when user has
        # successfully authenticated our app.
        google = get_google_auth(state=session['oauth_state'])
        try:
            token = google.fetch_token(
                Auth.TOKEN_URI,
                client_secret=Auth.CLIENT_SECRET,
                authorization_response=request.url)
        except HTTPError:
            return 'HTTPError occurred.'
        google = get_google_auth(token=token)
        resp = google.get(Auth.USER_INFO)
        if resp.status_code == 200:
            user_data = resp.json()
            email = user_data['email']
            """
            Your Domain specific check will come here.
            """
            if email.split('@')[1] != 'domain.com':
                flash('You cannot login using this email', 'error')
                return redirect(url_for('login'))
            user = User.query.filter_by(email=email).first()
            if user is None:
                user = User()
                user.email = email
            user.name = user_data['name']
            print(token)
            user.tokens = json.dumps(token)
            user.avatar = user_data['picture']
            db.session.add(user)
            db.session.commit()
            login_user(user)
            return redirect(url_for('index'))
        return 'Could not fetch your information.'

Answer 2

URL ; hd =... :

auth_url, state = google.authorization_url(AUTH_URI, access_type='offline', hd='savv.ch')

. , Google ( ), Auth, .

http://requests-oauthlib.readthedocs.io/en/latest/api.html#requests_oauthlib.OAuth2Session.authorization_url