import arrow from flask import request, render_template, redirect, url_for, flash, session, g from flask_login import login_user from flask_wtf import FlaskForm from wtforms import StringField, validators from app.auth.base import auth_bp from app.config import MFA_USER_ID from app.db import Session from app.email_utils import send_invalid_totp_login_email from app.extensions import limiter from app.log import LOG from app.models import User, RecoveryCode from app.utils import sanitize_next_url class RecoveryForm(FlaskForm): code = StringField("Code", validators=[validators.DataRequired()]) @auth_bp.route("/recovery", methods=["GET", "POST"]) @limiter.limit( "10/minute", deduct_when=lambda r: hasattr(g, "deduct_limit") and g.deduct_limit ) def recovery_route(): # passed from login page user_id = session.get(MFA_USER_ID) # user access this page directly without passing by login page if not user_id: flash("Unknown error, redirect back to main page", "warning") return redirect(url_for("auth.login")) user = User.get(user_id) if not user.two_factor_authentication_enabled(): flash("Only user with MFA enabled should go to this page", "warning") return redirect(url_for("auth.login")) recovery_form = RecoveryForm() next_url = sanitize_next_url(request.args.get("next")) if recovery_form.validate_on_submit(): code = recovery_form.code.data recovery_code = RecoveryCode.find_by_user_code(user, code) if recovery_code: if recovery_code.used: # Trigger rate limiter g.deduct_limit = True flash("Code already used", "error") else: del session[MFA_USER_ID] login_user(user) flash("Welcome back!", "success") recovery_code.used = True recovery_code.used_at = arrow.now() Session.commit() # User comes to login page from another page if next_url: LOG.d("redirect user to %s", next_url) return redirect(next_url) else: LOG.d("redirect user to dashboard") return redirect(url_for("dashboard.index")) else: # Trigger rate limiter g.deduct_limit = True flash("Incorrect code", "error") send_invalid_totp_login_email(user, "recovery") return render_template("auth/recovery.html", recovery_form=recovery_form)