app-MAIL-temp/app/auth/views/fido.py

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import json
import secrets
from time import time
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import webauthn
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from flask import (
request,
render_template,
redirect,
url_for,
flash,
session,
make_response,
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g,
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)
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from flask_login import login_user
from flask_wtf import FlaskForm
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from wtforms import HiddenField, validators, BooleanField
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from app.auth.base import auth_bp
from app.config import MFA_USER_ID
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from app.config import RP_ID, URL
from app.db import Session
from app.extensions import limiter
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from app.log import LOG
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from app.models import User, Fido, MfaBrowser
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from app.utils import sanitize_next_url
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class FidoTokenForm(FlaskForm):
sk_assertion = HiddenField("sk_assertion", validators=[validators.DataRequired()])
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remember = BooleanField(
"attr", default=False, description="Remember this browser for 30 days"
)
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@auth_bp.route("/fido", methods=["GET", "POST"])
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@limiter.limit(
"10/minute", deduct_when=lambda r: hasattr(g, "deduct_limit") and g.deduct_limit
)
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def fido():
# 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)
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if not (user and user.fido_enabled()):
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flash("Only user with security key linked should go to this page", "warning")
return redirect(url_for("auth.login"))
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auto_activate = True
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fido_token_form = FidoTokenForm()
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next_url = sanitize_next_url(request.args.get("next"))
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if request.cookies.get("mfa"):
browser = MfaBrowser.get_by(token=request.cookies.get("mfa"))
if browser and not browser.is_expired() and browser.user_id == user.id:
login_user(user)
flash(f"Welcome back!", "success")
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# Redirect user to correct page
return redirect(next_url or url_for("dashboard.index"))
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else:
# Trigger rate limiter
g.deduct_limit = True
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# Handling POST requests
if fido_token_form.validate_on_submit():
try:
sk_assertion = json.loads(fido_token_form.sk_assertion.data)
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except Exception:
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flash("Key verification failed. Error: Invalid Payload", "warning")
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return redirect(url_for("auth.login"))
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challenge = session["fido_challenge"]
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try:
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fido_key = Fido.get_by(
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uuid=user.fido_uuid, credential_id=sk_assertion["id"]
)
webauthn_user = webauthn.WebAuthnUser(
user.fido_uuid,
user.email,
user.name if user.name else user.email,
False,
fido_key.credential_id,
fido_key.public_key,
fido_key.sign_count,
RP_ID,
)
webauthn_assertion_response = webauthn.WebAuthnAssertionResponse(
webauthn_user, sk_assertion, challenge, URL, uv_required=False
)
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new_sign_count = webauthn_assertion_response.verify()
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except Exception as e:
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LOG.w(f"An error occurred in WebAuthn verification process: {e}")
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flash("Key verification failed.", "warning")
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# Trigger rate limiter
g.deduct_limit = True
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auto_activate = False
else:
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user.fido_sign_count = new_sign_count
Session.commit()
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del session[MFA_USER_ID]
session["sudo_time"] = int(time())
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login_user(user)
flash(f"Welcome back!", "success")
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# Redirect user to correct page
response = make_response(redirect(next_url or url_for("dashboard.index")))
if fido_token_form.remember.data:
browser = MfaBrowser.create_new(user=user)
Session.commit()
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response.set_cookie(
"mfa",
value=browser.token,
expires=browser.expires.datetime,
secure=True if URL.startswith("https") else False,
httponly=True,
samesite="Lax",
)
return response
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# Prepare information for key registration process
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session.pop("challenge", None)
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challenge = secrets.token_urlsafe(32)
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session["fido_challenge"] = challenge.rstrip("=")
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fidos = Fido.filter_by(uuid=user.fido_uuid).all()
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webauthn_users = []
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for fido in fidos:
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webauthn_users.append(
webauthn.WebAuthnUser(
user.fido_uuid,
user.email,
user.name if user.name else user.email,
False,
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fido.credential_id,
fido.public_key,
fido.sign_count,
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RP_ID,
)
)
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webauthn_assertion_options = webauthn.WebAuthnAssertionOptions(
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webauthn_users, challenge
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)
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webauthn_assertion_options = webauthn_assertion_options.assertion_dict
try:
# HACK: We need to upgrade to webauthn > 1 so it can support specifying the transports
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for credential in webauthn_assertion_options["allowCredentials"]:
del credential["transports"]
except KeyError:
# Should never happen but...
pass
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return render_template(
"auth/fido.html",
fido_token_form=fido_token_form,
webauthn_assertion_options=webauthn_assertion_options,
enable_otp=user.enable_otp,
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auto_activate=auto_activate,
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next_url=next_url,
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)