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

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import json
import secrets
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import webauthn
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from flask import request, render_template, redirect, url_for, flash, session
from flask_login import login_user
from flask_wtf import FlaskForm
from wtforms import HiddenField, validators
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.extensions import db
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from app.log import LOG
from app.models import User
class FidoTokenForm(FlaskForm):
sk_assertion = HiddenField("sk_assertion", validators=[validators.DataRequired()])
@auth_bp.route("/fido", methods=["GET", "POST"])
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"))
fido_token_form = FidoTokenForm()
next_url = request.args.get("next")
webauthn_user = webauthn.WebAuthnUser(
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user.fido_uuid,
user.email,
user.name if user.name else user.email,
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False,
user.fido_credential_id,
user.fido_pk,
user.fido_sign_count,
RP_ID,
)
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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)
except Exception as e:
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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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webauthn_assertion_response = webauthn.WebAuthnAssertionResponse(
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webauthn_user, sk_assertion, challenge, URL, uv_required=False
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)
try:
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new_sign_count = webauthn_assertion_response.verify()
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except Exception as e:
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LOG.error(f"An error occurred in WebAuthn verification process: {e}")
flash("Key verification failed.", "warning")
else:
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user.fido_sign_count = new_sign_count
db.session.commit()
del session[MFA_USER_ID]
login_user(user)
flash(f"Welcome back {user.name}!", "success")
# User comes to login page from another page
if next_url:
LOG.debug("redirect user to %s", next_url)
return redirect(next_url)
else:
LOG.debug("redirect user to dashboard")
return redirect(url_for("dashboard.index"))
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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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webauthn_assertion_options = webauthn.WebAuthnAssertionOptions(
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webauthn_user, challenge
)
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webauthn_assertion_options = webauthn_assertion_options.assertion_dict
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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,
)