447 lines
16 KiB
Python
447 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 - 2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Contains functions for registering clients."""
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import logging
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from twisted.internet import defer
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from synapse.api.errors import (
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AuthError, Codes, SynapseError, RegistrationError, InvalidCaptchaError
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)
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from synapse.http.client import CaptchaServerHttpClient
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from synapse import types
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from synapse.types import UserID
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from synapse.util.async import run_on_reactor
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from ._base import BaseHandler
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logger = logging.getLogger(__name__)
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class RegistrationHandler(BaseHandler):
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def __init__(self, hs):
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super(RegistrationHandler, self).__init__(hs)
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self.auth = hs.get_auth()
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self.profile_handler = hs.get_profile_handler()
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self.captcha_client = CaptchaServerHttpClient(hs)
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self._next_generated_user_id = None
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self.macaroon_gen = hs.get_macaroon_generator()
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@defer.inlineCallbacks
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def check_username(self, localpart, guest_access_token=None,
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assigned_user_id=None):
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if types.contains_invalid_mxid_characters(localpart):
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raise SynapseError(
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400,
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"User ID can only contain characters a-z, 0-9, or '=_-./'",
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Codes.INVALID_USERNAME
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)
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if not localpart:
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raise SynapseError(
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400,
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"User ID cannot be empty",
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Codes.INVALID_USERNAME
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)
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if localpart[0] == '_':
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raise SynapseError(
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400,
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"User ID may not begin with _",
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Codes.INVALID_USERNAME
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)
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user = UserID(localpart, self.hs.hostname)
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user_id = user.to_string()
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if assigned_user_id:
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if user_id == assigned_user_id:
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return
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else:
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raise SynapseError(
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400,
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"A different user ID has already been registered for this session",
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)
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self.check_user_id_not_appservice_exclusive(user_id)
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users = yield self.store.get_users_by_id_case_insensitive(user_id)
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if users:
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if not guest_access_token:
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raise SynapseError(
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400,
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"User ID already taken.",
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errcode=Codes.USER_IN_USE,
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)
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user_data = yield self.auth.get_user_by_access_token(guest_access_token)
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if not user_data["is_guest"] or user_data["user"].localpart != localpart:
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raise AuthError(
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403,
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"Cannot register taken user ID without valid guest "
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"credentials for that user.",
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errcode=Codes.FORBIDDEN,
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)
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@defer.inlineCallbacks
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def register(
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self,
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localpart=None,
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password=None,
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generate_token=True,
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guest_access_token=None,
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make_guest=False,
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admin=False,
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):
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"""Registers a new client on the server.
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Args:
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localpart : The local part of the user ID to register. If None,
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one will be generated.
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password (str) : The password to assign to this user so they can
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login again. This can be None which means they cannot login again
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via a password (e.g. the user is an application service user).
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generate_token (bool): Whether a new access token should be
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generated. Having this be True should be considered deprecated,
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since it offers no means of associating a device_id with the
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access_token. Instead you should call auth_handler.issue_access_token
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after registration.
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Returns:
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A tuple of (user_id, access_token).
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Raises:
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RegistrationError if there was a problem registering.
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"""
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yield run_on_reactor()
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password_hash = None
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if password:
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password_hash = self.auth_handler().hash(password)
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if localpart:
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yield self.check_username(localpart, guest_access_token=guest_access_token)
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was_guest = guest_access_token is not None
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if not was_guest:
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try:
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int(localpart)
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raise RegistrationError(
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400,
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"Numeric user IDs are reserved for guest users."
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)
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except ValueError:
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pass
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user = UserID(localpart, self.hs.hostname)
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user_id = user.to_string()
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token = None
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if generate_token:
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token = self.macaroon_gen.generate_access_token(user_id)
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yield self.store.register(
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user_id=user_id,
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token=token,
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password_hash=password_hash,
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was_guest=was_guest,
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make_guest=make_guest,
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create_profile_with_localpart=(
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# If the user was a guest then they already have a profile
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None if was_guest else user.localpart
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),
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admin=admin,
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)
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else:
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# autogen a sequential user ID
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attempts = 0
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token = None
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user = None
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while not user:
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localpart = yield self._generate_user_id(attempts > 0)
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user = UserID(localpart, self.hs.hostname)
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user_id = user.to_string()
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yield self.check_user_id_not_appservice_exclusive(user_id)
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if generate_token:
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token = self.macaroon_gen.generate_access_token(user_id)
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try:
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yield self.store.register(
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user_id=user_id,
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token=token,
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password_hash=password_hash,
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make_guest=make_guest,
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create_profile_with_localpart=user.localpart,
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)
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except SynapseError:
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# if user id is taken, just generate another
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user = None
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user_id = None
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token = None
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attempts += 1
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# We used to generate default identicons here, but nowadays
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# we want clients to generate their own as part of their branding
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# rather than there being consistent matrix-wide ones, so we don't.
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defer.returnValue((user_id, token))
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@defer.inlineCallbacks
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def appservice_register(self, user_localpart, as_token):
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user = UserID(user_localpart, self.hs.hostname)
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user_id = user.to_string()
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service = self.store.get_app_service_by_token(as_token)
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if not service:
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raise AuthError(403, "Invalid application service token.")
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if not service.is_interested_in_user(user_id):
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raise SynapseError(
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400, "Invalid user localpart for this application service.",
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errcode=Codes.EXCLUSIVE
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)
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service_id = service.id if service.is_exclusive_user(user_id) else None
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yield self.check_user_id_not_appservice_exclusive(
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user_id, allowed_appservice=service
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)
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yield self.store.register(
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user_id=user_id,
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password_hash="",
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appservice_id=service_id,
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create_profile_with_localpart=user.localpart,
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)
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defer.returnValue(user_id)
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@defer.inlineCallbacks
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def check_recaptcha(self, ip, private_key, challenge, response):
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"""
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Checks a recaptcha is correct.
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Used only by c/s api v1
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"""
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captcha_response = yield self._validate_captcha(
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ip,
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private_key,
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challenge,
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response
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)
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if not captcha_response["valid"]:
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logger.info("Invalid captcha entered from %s. Error: %s",
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ip, captcha_response["error_url"])
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raise InvalidCaptchaError(
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error_url=captcha_response["error_url"]
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)
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else:
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logger.info("Valid captcha entered from %s", ip)
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@defer.inlineCallbacks
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def register_saml2(self, localpart):
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"""
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Registers email_id as SAML2 Based Auth.
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"""
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if types.contains_invalid_mxid_characters(localpart):
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raise SynapseError(
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400,
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"User ID can only contain characters a-z, 0-9, or '=_-./'",
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)
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user = UserID(localpart, self.hs.hostname)
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user_id = user.to_string()
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yield self.check_user_id_not_appservice_exclusive(user_id)
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token = self.macaroon_gen.generate_access_token(user_id)
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try:
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yield self.store.register(
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user_id=user_id,
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token=token,
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password_hash=None,
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create_profile_with_localpart=user.localpart,
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)
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except Exception as e:
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yield self.store.add_access_token_to_user(user_id, token)
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# Ignore Registration errors
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logger.exception(e)
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defer.returnValue((user_id, token))
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@defer.inlineCallbacks
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def register_email(self, threepidCreds):
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"""
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Registers emails with an identity server.
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Used only by c/s api v1
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"""
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for c in threepidCreds:
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logger.info("validating theeepidcred sid %s on id server %s",
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c['sid'], c['idServer'])
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try:
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identity_handler = self.hs.get_handlers().identity_handler
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threepid = yield identity_handler.threepid_from_creds(c)
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except Exception:
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logger.exception("Couldn't validate 3pid")
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raise RegistrationError(400, "Couldn't validate 3pid")
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if not threepid:
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raise RegistrationError(400, "Couldn't validate 3pid")
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logger.info("got threepid with medium '%s' and address '%s'",
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threepid['medium'], threepid['address'])
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@defer.inlineCallbacks
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def bind_emails(self, user_id, threepidCreds):
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"""Links emails with a user ID and informs an identity server.
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Used only by c/s api v1
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"""
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# Now we have a matrix ID, bind it to the threepids we were given
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for c in threepidCreds:
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identity_handler = self.hs.get_handlers().identity_handler
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# XXX: This should be a deferred list, shouldn't it?
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yield identity_handler.bind_threepid(c, user_id)
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def check_user_id_not_appservice_exclusive(self, user_id, allowed_appservice=None):
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# valid user IDs must not clash with any user ID namespaces claimed by
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# application services.
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services = self.store.get_app_services()
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interested_services = [
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s for s in services
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if s.is_interested_in_user(user_id)
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and s != allowed_appservice
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]
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for service in interested_services:
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if service.is_exclusive_user(user_id):
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raise SynapseError(
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400, "This user ID is reserved by an application service.",
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errcode=Codes.EXCLUSIVE
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)
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@defer.inlineCallbacks
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def _generate_user_id(self, reseed=False):
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if reseed or self._next_generated_user_id is None:
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self._next_generated_user_id = (
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yield self.store.find_next_generated_user_id_localpart()
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)
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id = self._next_generated_user_id
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self._next_generated_user_id += 1
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defer.returnValue(str(id))
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@defer.inlineCallbacks
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def _validate_captcha(self, ip_addr, private_key, challenge, response):
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"""Validates the captcha provided.
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Used only by c/s api v1
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Returns:
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dict: Containing 'valid'(bool) and 'error_url'(str) if invalid.
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"""
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response = yield self._submit_captcha(ip_addr, private_key, challenge,
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response)
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# parse Google's response. Lovely format..
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lines = response.split('\n')
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json = {
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"valid": lines[0] == 'true',
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"error_url": "http://www.google.com/recaptcha/api/challenge?" +
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"error=%s" % lines[1]
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}
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defer.returnValue(json)
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@defer.inlineCallbacks
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def _submit_captcha(self, ip_addr, private_key, challenge, response):
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"""
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Used only by c/s api v1
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"""
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data = yield self.captcha_client.post_urlencoded_get_raw(
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"http://www.google.com:80/recaptcha/api/verify",
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args={
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'privatekey': private_key,
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'remoteip': ip_addr,
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'challenge': challenge,
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'response': response
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}
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)
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defer.returnValue(data)
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@defer.inlineCallbacks
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def get_or_create_user(self, requester, localpart, displayname,
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password_hash=None):
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"""Creates a new user if the user does not exist,
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else revokes all previous access tokens and generates a new one.
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Args:
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localpart : The local part of the user ID to register. If None,
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one will be randomly generated.
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Returns:
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A tuple of (user_id, access_token).
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Raises:
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RegistrationError if there was a problem registering.
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"""
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yield run_on_reactor()
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if localpart is None:
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raise SynapseError(400, "Request must include user id")
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need_register = True
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try:
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yield self.check_username(localpart)
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except SynapseError as e:
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if e.errcode == Codes.USER_IN_USE:
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need_register = False
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else:
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raise
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user = UserID(localpart, self.hs.hostname)
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user_id = user.to_string()
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token = self.macaroon_gen.generate_access_token(user_id)
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if need_register:
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yield self.store.register(
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user_id=user_id,
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token=token,
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password_hash=password_hash,
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create_profile_with_localpart=user.localpart,
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)
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else:
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yield self.store.user_delete_access_tokens(user_id=user_id)
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yield self.store.add_access_token_to_user(user_id=user_id, token=token)
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if displayname is not None:
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logger.info("setting user display name: %s -> %s", user_id, displayname)
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yield self.profile_handler.set_displayname(
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user, requester, displayname, by_admin=True,
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)
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defer.returnValue((user_id, token))
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def auth_handler(self):
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return self.hs.get_auth_handler()
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@defer.inlineCallbacks
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def guest_access_token_for(self, medium, address, inviter_user_id):
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access_token = yield self.store.get_3pid_guest_access_token(medium, address)
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if access_token:
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defer.returnValue(access_token)
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_, access_token = yield self.register(
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generate_token=True,
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make_guest=True
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)
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access_token = yield self.store.save_or_get_3pid_guest_access_token(
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medium, address, access_token, inviter_user_id
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)
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defer.returnValue(access_token)
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