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3f84a63e6d
* Feat: Allow TOTP for up to one minute in the future and in the past * Feat: Allow TOTP for up to one minute in the future and in the past Co-authored-by: Adrià Casajús <adria.casajus@proton.ch>
107 lines
3.3 KiB
Python
107 lines
3.3 KiB
Python
import pyotp
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from flask import (
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render_template,
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redirect,
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url_for,
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flash,
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session,
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make_response,
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request,
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g,
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)
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from flask_login import login_user
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from flask_wtf import FlaskForm
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from wtforms import BooleanField, StringField, validators
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from app.auth.base import auth_bp
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from app.config import MFA_USER_ID, URL
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from app.db import Session
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from app.email_utils import send_invalid_totp_login_email
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from app.extensions import limiter
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from app.models import User, MfaBrowser
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from app.utils import sanitize_next_url
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class OtpTokenForm(FlaskForm):
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token = StringField("Token", validators=[validators.DataRequired()])
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remember = BooleanField(
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"attr", default=False, description="Remember this browser for 30 days"
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)
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@auth_bp.route("/mfa", methods=["GET", "POST"])
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@limiter.limit(
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"10/minute", deduct_when=lambda r: hasattr(g, "deduct_limit") and g.deduct_limit
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)
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def mfa():
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# passed from login page
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user_id = session.get(MFA_USER_ID)
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# user access this page directly without passing by login page
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if not user_id:
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flash("Unknown error, redirect back to main page", "warning")
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return redirect(url_for("auth.login"))
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user = User.get(user_id)
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if not (user and user.enable_otp):
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flash("Only user with MFA enabled should go to this page", "warning")
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return redirect(url_for("auth.login"))
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otp_token_form = OtpTokenForm()
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next_url = sanitize_next_url(request.args.get("next"))
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if request.cookies.get("mfa"):
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browser = MfaBrowser.get_by(token=request.cookies.get("mfa"))
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if browser and not browser.is_expired() and browser.user_id == user.id:
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login_user(user)
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flash(f"Welcome back!", "success")
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# Redirect user to correct page
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return redirect(next_url or url_for("dashboard.index"))
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else:
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# Trigger rate limiter
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g.deduct_limit = True
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if otp_token_form.validate_on_submit():
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totp = pyotp.TOTP(user.otp_secret)
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token = otp_token_form.token.data.replace(" ", "")
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if totp.verify(token, valid_window=2) and user.last_otp != token:
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del session[MFA_USER_ID]
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user.last_otp = token
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Session.commit()
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login_user(user)
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flash(f"Welcome back!", "success")
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# Redirect user to correct page
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response = make_response(redirect(next_url or url_for("dashboard.index")))
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if otp_token_form.remember.data:
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browser = MfaBrowser.create_new(user=user)
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Session.commit()
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response.set_cookie(
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"mfa",
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value=browser.token,
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expires=browser.expires.datetime,
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secure=True if URL.startswith("https") else False,
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httponly=True,
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samesite="Lax",
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)
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return response
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else:
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flash("Incorrect token", "warning")
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# Trigger rate limiter
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g.deduct_limit = True
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otp_token_form.token.data = None
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send_invalid_totp_login_email(user, "TOTP")
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return render_template(
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"auth/mfa.html",
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otp_token_form=otp_token_form,
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enable_fido=(user.fido_enabled()),
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next_url=next_url,
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)
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