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https://github.com/janeczku/calibre-web
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ebe7cd7ba4
Cookies are saved in database for better Invalidation Cookies expiry date is saved in database for further deletion (missing) Database conversion is missing
177 lines
7.0 KiB
Python
177 lines
7.0 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
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# Copyright (C) 2018-2019 shavitmichael, OzzieIsaacs
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""This module is used to control authentication/authorization of Kobo sync requests.
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This module also includes research notes into the auth protocol used by Kobo devices.
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Log-in:
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When first booting a Kobo device the user must sign into a Kobo (or affiliate) account.
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Upon successful sign-in, the user is redirected to
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https://auth.kobobooks.com/CrossDomainSignIn?id=<some id>
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which serves the following response:
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<script type='text/javascript'>
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location.href='kobo://UserAuthenticated?userId=<redacted>&userKey<redacted>&email=<redacted>&returnUrl=https%3a%2f%2fwww.kobo.com';
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</script>
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And triggers the insertion of a userKey into the device's User table.
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Together, the device's DeviceId and UserKey act as an *irrevocable* authentication
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token to most (if not all) Kobo APIs. In fact, in most cases only the UserKey is
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required to authorize the API call.
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Changing Kobo password *does not* invalidate user keys! This is apparently a known
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issue for a few years now https://www.mobileread.com/forums/showpost.php?p=3476851&postcount=13
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(although this poster hypothesised that Kobo could blacklist a DeviceId, many endpoints
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will still grant access given the userkey.)
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Official Kobo Store Api authorization:
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* For most of the endpoints we care about (sync, metadata, tags, etc), the userKey is
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passed in the x-kobo-userkey header, and is sufficient to authorize the API call.
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* Some endpoints (e.g: AnnotationService) instead make use of Bearer tokens pass through
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an authorization header. To get a BearerToken, the device makes a POST request to the
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v1/auth/device endpoint with the secret UserKey and the device's DeviceId.
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* The book download endpoint passes an auth token as a URL param instead of a header.
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Our implementation:
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We pretty much ignore all of the above. To authenticate the user, we generate a random
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and unique token that they append to the CalibreWeb Url when setting up the api_store
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setting on the device.
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Thus, every request from the device to the api_store will hit CalibreWeb with the
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auth_token in the url (e.g: https://mylibrary.com/<auth_token>/v1/library/sync).
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In addition, once authenticated we also set the login cookie on the response that will
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be sent back for the duration of the session to authorize subsequent API calls (in
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particular calls to non-Kobo specific endpoints such as the CalibreWeb book download).
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"""
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from binascii import hexlify
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from datetime import datetime
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from os import urandom
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from functools import wraps
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from flask import g, Blueprint, abort, request
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from .cw_login import login_user, current_user
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from flask_babel import gettext as _
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from flask_limiter import RateLimitExceeded
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from . import logger, config, calibre_db, db, helper, ub, lm, limiter
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from .render_template import render_title_template
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from .usermanagement import user_login_required
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log = logger.create()
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kobo_auth = Blueprint("kobo_auth", __name__, url_prefix="/kobo_auth")
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@kobo_auth.route("/generate_auth_token/<int:user_id>")
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@user_login_required
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def generate_auth_token(user_id):
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warning = False
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host_list = request.host.rsplit(':')
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if len(host_list) == 1:
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host = ':'.join(host_list)
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else:
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host = ':'.join(host_list[0:-1])
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if host.startswith('127.') or host.lower() == 'localhost' or host.startswith('[::ffff:7f') or host == "[::1]":
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warning = _('Please access Calibre-Web from non localhost to get valid api_endpoint for kobo device')
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# Generate auth token if none is existing for this user
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auth_token = ub.session.query(ub.RemoteAuthToken).filter(
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ub.RemoteAuthToken.user_id == user_id
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).filter(ub.RemoteAuthToken.token_type==1).first()
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if not auth_token:
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auth_token = ub.RemoteAuthToken()
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auth_token.user_id = user_id
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auth_token.expiration = datetime.max
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auth_token.auth_token = (hexlify(urandom(16))).decode("utf-8")
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auth_token.token_type = 1
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ub.session.add(auth_token)
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ub.session_commit()
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books = calibre_db.session.query(db.Books).join(db.Data).all()
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for book in books:
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formats = [data.format for data in book.data]
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if 'KEPUB' not in formats and config.config_kepubifypath and 'EPUB' in formats:
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helper.convert_book_format(book.id, config.config_calibre_dir, 'EPUB', 'KEPUB', current_user.name)
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return render_title_template(
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"generate_kobo_auth_url.html",
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title=_("Kobo Setup"),
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auth_token=auth_token.auth_token,
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warning=warning
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)
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@kobo_auth.route("/deleteauthtoken/<int:user_id>", methods=["POST"])
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@user_login_required
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def delete_auth_token(user_id):
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# Invalidate any previously generated Kobo Auth token for this user
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ub.session.query(ub.RemoteAuthToken).filter(ub.RemoteAuthToken.user_id == user_id)\
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.filter(ub.RemoteAuthToken.token_type==1).delete()
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return ub.session_commit()
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def disable_failed_auth_redirect_for_blueprint(bp):
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lm.blueprint_login_views[bp.name] = None
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def get_auth_token():
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if "auth_token" in g:
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return g.get("auth_token")
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else:
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return None
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def register_url_value_preprocessor(kobo):
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@kobo.url_value_preprocessor
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# pylint: disable=unused-variable
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def pop_auth_token(__, values):
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g.auth_token = values.pop("auth_token")
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def requires_kobo_auth(f):
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@wraps(f)
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def inner(*args, **kwargs):
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auth_token = get_auth_token()
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if auth_token is not None:
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try:
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limiter.check()
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except RateLimitExceeded:
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return abort(429)
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except (ConnectionError, Exception) as e:
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log.error("Connection error to limiter backend: %s", e)
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return abort(429)
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user = (
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ub.session.query(ub.User)
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.join(ub.RemoteAuthToken)
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.filter(ub.RemoteAuthToken.auth_token == auth_token).filter(ub.RemoteAuthToken.token_type==1)
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.first()
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)
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if user is not None:
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login_user(user)
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[limiter.limiter.storage.clear(k.key) for k in limiter.current_limits]
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return f(*args, **kwargs)
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log.debug("Received Kobo request without a recognizable auth token.")
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return abort(401)
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return inner
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