add partial fido2/WebAuthn

default.nix

@@ -121,6 +121,7 @@ in
       blinker
       ory-hydra-client
       authlib # as oauth client lib
+      fido2 # for webauthn
       flask_migrate # db migrations
 
       gunicorn
@@ -142,5 +143,6 @@ in
 
     nose
     mypy
+
   ];
 }

lenticular_cloud/app.py

@@ -32,7 +32,7 @@ def create_app() -> Flask:
 
     #app.ldap_orm = Connection(app.config['LDAP_URL'], app.config['LDAP_BIND_DN'], app.config['LDAP_BIND_PW'], auto_bind=True)
     server = Server(app.config['LDAP_URL'], get_info=ALL)
-    app.ldap_conn = Connection(server, app.config['LDAP_BIND_DN'], app.config['LDAP_BIND_PW'], auto_bind=True)
+    app.ldap_conn = Connection(server, app.config['LDAP_BIND_DN'], app.config['LDAP_BIND_PW'], auto_bind="DEFAULT")
     model.ldap_conn = app.ldap_conn
     model.base_dn = app.config['LDAP_BASE_DN']
 

lenticular_cloud/cli.py

@@ -2,6 +2,7 @@ import argparse
 from .model import db, User, UserSignUp
 from .app import create_app
 from werkzeug.middleware.proxy_fix import ProxyFix
+from flask_migrate import upgrade
 
 import logging
 import os
@@ -23,6 +24,9 @@ def entry_point():
     parser_run = subparsers.add_parser('run')
     parser_run.set_defaults(func=cli_run)
 
+    parser_db_upgrade = subparsers.add_parser('db_upgrade')
+    parser_db_upgrade.set_defaults(func=cli_db_upgrade)
+
     '''
     parser_upcoming = subparsers.add_parser('upcoming')
     parser_upcoming.set_defaults(func=cli_upcoming)
@@ -73,6 +77,10 @@ def cli_run(app, args):
     app.wsgi_app = ProxyFix(app.wsgi_app, x_proto=1)
     app.run(debug=True, host='127.0.0.1', port=5000)
 
+def cli_db_upgrade(args):
+    upgrade()
+
+
 if __name__ == "__main__":
     entry_point()
 

lenticular_cloud/form/auth.py

@@ -3,10 +3,11 @@ from flask_wtf import FlaskForm
 from wtforms import StringField, SubmitField, TextField, \
         TextAreaField, PasswordField, IntegerField, FloatField, \
         DateTimeField, DateField, FormField, BooleanField, \
-        SelectField, Form as NoCsrfForm, SelectMultipleField
+        SelectField, Form as NoCsrfForm, SelectMultipleField, \
+        HiddenField
 from wtforms.fields.html5 import EmailField
 from wtforms.widgets.html5 import NumberInput, DateInput
-from wtforms.validators import DataRequired, NumberRange, Optional, NoneOf, Length, Regexp
+from wtforms.validators import DataRequired, NumberRange, Optional, NoneOf, Length, Regexp, InputRequired
 from datetime import datetime
 
 
@@ -25,6 +26,11 @@ class TotpForm(FlaskForm):
     submit = SubmitField(gettext('Authorize'))
 
 
+class WebauthnLoginForm(FlaskForm):
+    """webauthn login form"""
+
+    assertion = HiddenField('Assertion', [InputRequired()])
+
 class Fido2Form(FlaskForm):
     fido2 = TextField(gettext('Fido2'), default="Javascript Required")
     submit = SubmitField(gettext('Authorize'))

lenticular_cloud/form/base.py

@@ -1,8 +1,14 @@
+from flask_wtf import FlaskForm
 from wtforms import SelectField, FieldList as WTFFieldList, Form
 from wtforms.fields import Field
 from ..model import db
 
 
+
+class ButtonForm(FlaskForm):
+    """only button form"""
+
+
 class FieldList(WTFFieldList):
     def __init__(self, *args, **kwargs):
         self.modify = kwargs.pop("modify", True)

lenticular_cloud/form/frontend.py

@@ -6,7 +6,7 @@ from wtforms import StringField, SubmitField, TextField, \
         SelectField, Form as NoCsrfForm, HiddenField
 from wtforms.widgets.html5 import NumberInput, DateInput
 from wtforms.validators import DataRequired, NumberRange, \
-        Optional, NoneOf, Length, EqualTo
+        Optional, NoneOf, Length, EqualTo, InputRequired
 
 
 class ClientCertForm(FlaskForm):
@@ -34,6 +34,13 @@ class TOTPDeleteForm(FlaskForm):
     submit = SubmitField(gettext('Delete'))
 
 
+class WebauthnRegisterForm(FlaskForm):
+    """webauthn register token form"""
+
+    attestation = HiddenField('Attestation', [InputRequired()])
+    name = StringField('Name', [Length(max=250)])
+    submit = SubmitField('Register', render_kw={'disabled': True})
+
 class PasswordChangeForm(FlaskForm):
     password_old = PasswordField(gettext('Old Password'), validators=[DataRequired()])
     password_new = PasswordField(gettext('New Password'), validators=[DataRequired()])

lenticular_cloud/model.py

@@ -239,6 +239,7 @@ class User(EntryBase):
     last_login = db.Column(db.DateTime, nullable=True)
 
     totps = db.relationship('Totp', back_populates='user')
+    webauthn_credentials = db.relationship('WebauthnCredential', back_populates='user', cascade='delete,delete-orphan', passive_deletes=True)
 
     dn = "uid={uid},{base_dn}"
     base_dn = "ou=users,{_base_dn}"
@@ -297,7 +298,7 @@ class User(EntryBase):
 
         def by_username(self, username) -> Optional['User']:
             result = self._query('(uid={username:s})'.format(username=escape_filter_chars(username)))
-            if len(result) > 0:
+            if len(result) > 0 and isinstance(result[0], User):
                 return result[0]
             else:
                 return None
@@ -334,6 +335,20 @@ class Totp(db.Model):
         totp = pyotp.TOTP(self.secret)
         return totp.verify(token)
 
+
+class WebauthnCredential(db.Model):  # pylint: disable=too-few-public-methods
+    """Webauthn credential model"""
+
+    id = db.Column(db.Integer, primary_key=True)
+    user_id = db.Column(db.Integer, db.ForeignKey('user.id', ondelete='CASCADE'), nullable=False)
+    user_handle = db.Column(db.String(64), nullable=False)
+    credential_data = db.Column(db.LargeBinary, nullable=False)
+    name = db.Column(db.String(250))
+    registered = db.Column(db.DateTime, default=datetime.utcnow)
+
+    user = db.relationship('User', back_populates='webauthn_credentials')
+
+
 class Group(EntryBase):
     __abstract__ = True # for sqlalchemy, disable for now
     dn = "cn={cn},{base_dn}"

lenticular_cloud/template/admin/clients.html.j2

@@ -5,6 +5,10 @@
 {% block content %}
 
 
+<p>
+<a href="{{url_for('.client_new')}}">Add Client</a>
+</p>
+
 <table class="table">
 	<thead>
 		<tr>

lenticular_cloud/views/auth.py

@@ -1,5 +1,4 @@
 
-from authlib.integrations.flask_client import OAuth
 from urllib.parse import urlencode, parse_qs
 
 import flask
@@ -26,12 +25,13 @@ from ..model import db, User, SecurityUser, UserSignUp
 from ..form.auth import ConsentForm, LoginForm, RegistrationForm
 from ..auth_providers import AUTH_PROVIDER_LIST
 from ..hydra import hydra_service
+from ..wrapped_fido2_server import WrappedFido2Server
 
 
 logger = logging.getLogger(__name__)
 
 auth_views = Blueprint('auth', __name__, url_prefix='/auth')
-
+webauthn = WrappedFido2Server()
 
 
 @auth_views.route('/consent', methods=['GET', 'POST'])
@@ -171,6 +171,21 @@ async def login_auth() -> ResponseReturnValue:
     return render_template('auth/login_auth.html.j2', forms=auth_forms)
 
 
+
+@auth_views.route('/webauthn/pkcro', methods=['POST'])
+def webauthn_pkcro_route():
+    """login webauthn pkcro route"""
+
+    user = User.query.filter(User.id == session.get('webauthn_login_user_id')).one_or_none()
+    form = ButtonForm()
+    if user and form.validate_on_submit():
+        pkcro, state = webauthn.authenticate_begin(webauthn_credentials(user))
+        session['webauthn_login_state'] = state
+        return Response(b64encode(cbor.encode(pkcro)).decode('utf-8'), mimetype='text/plain')
+
+    return '', HTTPStatus.BAD_REQUEST
+
+
 @auth_views.route("/logout")
 async def logout() -> ResponseReturnValue:
     logout_challenge = request.args.get('logout_challenge')

lenticular_cloud/views/frontend.py

@@ -1,11 +1,15 @@
 
 from authlib.integrations.base_client.errors import MissingTokenError, InvalidTokenError
-from urllib.parse import urlencode, parse_qs
+from base64 import b64encode, b64decode
-from flask import Blueprint, redirect, request
+from fido2 import cbor
+from fido2.client import ClientData
+from fido2.ctap2 import AttestationObject, AttestedCredentialData, AuthenticatorData
+from flask import Blueprint, Response, redirect, request
 from flask import current_app
-from flask import jsonify, session
+from flask import jsonify, session, flash
 from flask import render_template, url_for
 from flask_login import login_user, logout_user, current_user
+from http import HTTPStatus
 from werkzeug.utils import redirect
 import logging
 from datetime import timedelta
@@ -14,12 +18,17 @@ from flask.typing import ResponseReturnValue
 from oauthlib.oauth2.rfc6749.errors import TokenExpiredError
 from ory_hydra_client.api.admin import list_subject_consent_sessions, revoke_consent_sessions
 from ory_hydra_client.models import GenericError
+from urllib.parse import urlencode, parse_qs
+from random import SystemRandom
+import string
 from typing import Optional
 
-from ..model import db, User, SecurityUser, Totp
+from ..model import db, User, SecurityUser, Totp, WebauthnCredential
 from ..form.frontend import ClientCertForm, TOTPForm, \
-    TOTPDeleteForm, PasswordChangeForm
+    TOTPDeleteForm, PasswordChangeForm, WebauthnRegisterForm
+from ..form.base import  ButtonForm
 from ..auth_providers import LdapAuthProvider
+from .auth import webauthn
 from .oauth2 import redirect_login, oauth2
 from ..hydra import hydra_service
 
@@ -161,6 +170,87 @@ def totp_delete(totp_name) -> ResponseReturnValue:
             'status': 'ok'})
 
 
+@frontend_views.route('/webauthn/list', methods=['GET'])
+def webauthn_list_route() -> ResponseReturnValue:
+    """list registered credentials for current user"""
+
+    creds = WebauthnCredential.query.all()
+    return render_template('webauthn_list.html', creds=creds, button_form=ButtonForm())
+
+
+@frontend_views.route('/webauthn/delete/<webauthn_id>', methods=['POST'])
+def webauthn_delete_route(webauthn_id: str) -> ResponseReturnValue:
+    """delete registered credential"""
+
+    form = ButtonForm()
+    if form.validate_on_submit():
+        cred = WebauthnCredential.query.filter(WebauthnCredential.id == webauthn_id).one()
+        db.session.delete(cred)
+        db.session.commit()
+        return redirect(url_for('app.webauthn_list_route'))
+
+    return '', HTTPStatus.BAD_REQUEST
+
+
+
+def webauthn_credentials(user: User) -> list[AttestedCredentialData]:
+    """get and decode all credentials for given user"""
+    return [AttestedCredentialData.create(**cbor.decode(cred.credential_data)) for cred in user.webauthn_credentials]
+
+
+def random_string(length=32) -> str:
+    """generates random string"""
+    return ''.join([SystemRandom().choice(string.ascii_letters + string.digits) for i in range(length)])
+
+
+@frontend_views.route('/webauthn/pkcco', methods=['POST'])
+def webauthn_pkcco_route() -> ResponseReturnValue:
+    """get publicKeyCredentialCreationOptions"""
+
+    form = ButtonForm()
+    if form.validate_on_submit():
+        user = User.query.get(current_user.id)
+        user_handle = random_string()
+        exclude_credentials = webauthn_credentials(user)
+        pkcco, state = webauthn.register_begin(
+            {'id': user_handle.encode('utf-8'), 'name': user.username, 'displayName': user.username},
+            exclude_credentials)
+        session['webauthn_register_user_handle'] = user_handle
+        session['webauthn_register_state'] = state
+        return Response(b64encode(cbor.encode(pkcco)).decode('utf-8'), mimetype='text/plain')
+
+    return '', HTTPStatus.BAD_REQUEST
+
+
+@frontend_views.route('/webauthn/register', methods=['GET', 'POST'])
+def webauthn_register_route() -> ResponseReturnValue:
+    """register credential for current user"""
+
+    user = User.query.get(current_user.id)
+    form = WebauthnRegisterForm()
+    if form.validate_on_submit():
+        try:
+            attestation = cbor.decode(b64decode(form.attestation.data))
+            auth_data = webauthn.register_complete(
+                session.pop('webauthn_register_state'),
+                ClientData(attestation['clientDataJSON']),
+                AttestationObject(attestation['attestationObject']))
+
+            db.session.add(WebauthnCredential(
+                user_id=user.id,
+                user_handle=session.pop('webauthn_register_user_handle'),
+                credential_data=cbor.encode(auth_data.credential_data.__dict__),
+                name=form.name.data))
+            db.session.commit()
+
+            return redirect(url_for('app.webauthn_list_route'))
+        except (KeyError, ValueError) as e:
+            current_app.logger.exception(e)
+            flash('Error during registration.', 'error')
+
+    return render_template('webauthn_register.html', form=form)
+
+
 @frontend_views.route('/password_change')
 def password_change() -> ResponseReturnValue:
     form = PasswordChangeForm()
@@ -186,10 +276,10 @@ def password_change_post() -> ResponseReturnValue:
 
 
 @frontend_views.route('/oauth2_token')
-def oauth2_tokens() -> ResponseReturnValue:
+async def oauth2_tokens() -> ResponseReturnValue:
 
     subject = oauth2.custom.get('/userinfo').json()['sub']
-    consent_sessions = list_subject_consent_sessions.sync(subject=subject, _client=hydra_service.hydra_client)
+    consent_sessions = await list_subject_consent_sessions.asyncio(subject=subject, _client=hydra_service.hydra_client)
     if consent_sessions is None or isinstance( consent_sessions, GenericError):
        return 'internal error, could not fetch sessions', 500
     return render_template(
@@ -198,9 +288,9 @@ def oauth2_tokens() -> ResponseReturnValue:
 
 
 @frontend_views.route('/oauth2_token/<client_id>', methods=['DELETE'])
-def oauth2_token_revoke(client_id: str) -> ResponseReturnValue:
+async def oauth2_token_revoke(client_id: str) -> ResponseReturnValue:
     subject = oauth2.session.get('/userinfo').json()['sub']
-    revoke_consent_sessions.sync( _client=hydra_service.hydra_client,
+    await revoke_consent_sessions.asyncio( _client=hydra_service.hydra_client,
                                 subject=subject,
                                 client=client_id)
 

lenticular_cloud/wrapped_fido2_server.py

@@ -0,0 +1,21 @@
+# This file is part of sner4 project governed by MIT license, see the LICENSE.txt file.
+# source: https://github.com/bodik/flask-webauthn-example/blob/master/fwe/wrapped_fido2_server.py
+"""
+yubico fido2 server wrapped for flask factory pattern delayed configuration
+"""
+
+from socket import getfqdn
+
+from fido2.server import Fido2Server, PublicKeyCredentialRpEntity
+
+
+class WrappedFido2Server(Fido2Server):
+    """yubico fido2 server wrapped for flask factory pattern delayed configuration"""
+
+    def __init__(self):
+        """initialize with default rp name"""
+        super().__init__(PublicKeyCredentialRpEntity(getfqdn(), 'name'))
+
+    def init_app(self, app) -> None:
+        """reinitialize on factory pattern config request"""
+        super().__init__(PublicKeyCredentialRpEntity(app.config['SERVER_NAME'] or getfqdn(), 'name'))

migrations/versions/52a21983d2a8_add_webauthn.py

@@ -0,0 +1,37 @@
+"""add webauthn
+
+Revision ID: 52a21983d2a8
+Revises: ff2f2e871dfc
+Create Date: 2022-02-20 17:00:04.531393
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '52a21983d2a8'
+down_revision = 'ff2f2e871dfc'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('webauthn_credential',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('user_id', sa.Integer(), nullable=False),
+    sa.Column('user_handle', sa.String(length=64), nullable=False),
+    sa.Column('credential_data', sa.LargeBinary(), nullable=False),
+    sa.Column('name', sa.String(length=250), nullable=True),
+    sa.Column('registered', sa.DateTime(), nullable=True),
+    sa.ForeignKeyConstraint(['user_id'], ['user.id'], ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('webauthn_credential')
+    # ### end Alembic commands ###

migrations/versions/ff2f2e871dfc_init.py

@@ -7,6 +7,9 @@ Create Date: 2022-02-20 16:56:13.258209
 """
 from alembic import op
 import sqlalchemy as sa
+from sqlalchemy import engine_from_config
+from sqlalchemy.engine import reflection
+
 
 
 # revision identifiers, used by Alembic.
@@ -18,6 +21,18 @@ depends_on = None
 
 def upgrade():
     # ### commands auto generated by Alembic - please adjust! ###
+
+    # init sate, migrate from non versioned db schema
+    # by checking if tables exist
+    
+    config = op.get_context().config
+    engine = engine_from_config(
+        config.get_section(config.config_ini_section), prefix="sqlalchemy."
+    )
+    inspector = reflection.Inspector.from_engine(engine)
+    tables = inspector.get_table_names()
+
+    if 'user' not in tables:
         op.create_table('user',
         sa.Column('id', sa.String(length=36), nullable=False),
         sa.Column('username', sa.String(), nullable=False),
@@ -28,6 +43,7 @@ def upgrade():
         sa.PrimaryKeyConstraint('id'),
         sa.UniqueConstraint('username')
         )
+    if 'user_sign_up' not in tables:
         op.create_table('user_sign_up',
         sa.Column('id', sa.Integer(), nullable=False),
         sa.Column('username', sa.String(), nullable=False),
@@ -36,6 +52,7 @@ def upgrade():
         sa.Column('created_at', sa.DateTime(), nullable=False),
         sa.PrimaryKeyConstraint('id')
         )
+    if 'totp' not in tables:
         op.create_table('totp',
         sa.Column('id', sa.Integer(), nullable=False),
         sa.Column('secret', sa.String(), nullable=False),
@@ -49,8 +66,9 @@ def upgrade():
 
 
 def downgrade():
+    pass
     # ### commands auto generated by Alembic - please adjust! ###
-    op.drop_table('totp')
+    #op.drop_table('totp')
-    op.drop_table('user_sign_up')
+    #op.drop_table('user_sign_up')
-    op.drop_table('user')
+    #op.drop_table('user')
     # ### end Alembic commands ###

requirements-dev.txt

@@ -1,2 +1,3 @@
 flask-debug
 types-python-dateutil
+types-ldap3