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https://github.com/simple-login/app.git
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125 lines
4 KiB
Python
125 lines
4 KiB
Python
import json
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import secrets
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import webauthn
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from flask import request, render_template, redirect, url_for, flash, session
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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 HiddenField, validators
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from app.auth.base import auth_bp
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from app.config import MFA_USER_ID
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from app.config import RP_ID, URL
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from app.extensions import db
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from app.log import LOG
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from app.models import User, Fido
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class FidoTokenForm(FlaskForm):
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sk_assertion = HiddenField("sk_assertion", validators=[validators.DataRequired()])
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@auth_bp.route("/fido", methods=["GET", "POST"])
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def fido():
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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.fido_enabled()):
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flash("Only user with security key linked should go to this page", "warning")
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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 = request.args.get("next")
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# Handling POST requests
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if fido_token_form.validate_on_submit():
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try:
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sk_assertion = json.loads(fido_token_form.sk_assertion.data)
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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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try:
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fido_key = Fido.get_by(
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uuid=user.fido_uuid, credential_id=sk_assertion["id"]
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)
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webauthn_user = webauthn.WebAuthnUser(
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user.fido_uuid,
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user.email,
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user.name if user.name else user.email,
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False,
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fido_key.credential_id,
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fido_key.public_key,
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fido_key.sign_count,
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RP_ID,
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)
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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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)
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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}")
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flash("Key verification failed.", "warning")
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auto_activate = False
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else:
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user.fido_sign_count = new_sign_count
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db.session.commit()
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del session[MFA_USER_ID]
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login_user(user)
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flash(f"Welcome back {user.name}!", "success")
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# User comes to login page from another page
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if next_url:
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LOG.debug("redirect user to %s", next_url)
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return redirect(next_url)
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else:
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LOG.debug("redirect user to dashboard")
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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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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(
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webauthn.WebAuthnUser(
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user.fido_uuid,
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user.email,
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user.name if user.name else user.email,
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False,
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fido.credential_id,
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fido.public_key,
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fido.sign_count,
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RP_ID,
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)
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)
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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
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return render_template(
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"auth/fido.html",
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fido_token_form=fido_token_form,
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webauthn_assertion_options=webauthn_assertion_options,
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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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)
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