MatrixSynapse/synapse/handlers/register.py

539 lines
19 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2014 - 2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Contains functions for registering clients."""
import logging
from twisted.internet import defer
from synapse import types
from synapse.api.errors import (
AuthError,
Codes,
InvalidCaptchaError,
RegistrationError,
SynapseError,
)
from synapse.http.client import CaptchaServerHttpClient
from synapse.types import RoomAlias, RoomID, UserID, create_requester
from synapse.util.async_helpers import Linearizer
from synapse.util.threepids import check_3pid_allowed
from ._base import BaseHandler
logger = logging.getLogger(__name__)
class RegistrationHandler(BaseHandler):
def __init__(self, hs):
"""
Args:
hs (synapse.server.HomeServer):
"""
super(RegistrationHandler, self).__init__(hs)
self.hs = hs
self.auth = hs.get_auth()
self._auth_handler = hs.get_auth_handler()
self.profile_handler = hs.get_profile_handler()
self.user_directory_handler = hs.get_user_directory_handler()
self.captcha_client = CaptchaServerHttpClient(hs)
self._next_generated_user_id = None
self.macaroon_gen = hs.get_macaroon_generator()
self._generate_user_id_linearizer = Linearizer(
name="_generate_user_id_linearizer",
)
self._server_notices_mxid = hs.config.server_notices_mxid
@defer.inlineCallbacks
def check_username(self, localpart, guest_access_token=None,
assigned_user_id=None):
if types.contains_invalid_mxid_characters(localpart):
raise SynapseError(
400,
"User ID can only contain characters a-z, 0-9, or '=_-./'",
Codes.INVALID_USERNAME
)
if not localpart:
raise SynapseError(
400,
"User ID cannot be empty",
Codes.INVALID_USERNAME
)
if localpart[0] == '_':
raise SynapseError(
400,
"User ID may not begin with _",
Codes.INVALID_USERNAME
)
user = UserID(localpart, self.hs.hostname)
user_id = user.to_string()
if assigned_user_id:
if user_id == assigned_user_id:
return
else:
raise SynapseError(
400,
"A different user ID has already been registered for this session",
)
self.check_user_id_not_appservice_exclusive(user_id)
users = yield self.store.get_users_by_id_case_insensitive(user_id)
if users:
if not guest_access_token:
raise SynapseError(
400,
"User ID already taken.",
errcode=Codes.USER_IN_USE,
)
user_data = yield self.auth.get_user_by_access_token(guest_access_token)
if not user_data["is_guest"] or user_data["user"].localpart != localpart:
raise AuthError(
403,
"Cannot register taken user ID without valid guest "
"credentials for that user.",
errcode=Codes.FORBIDDEN,
)
@defer.inlineCallbacks
def register(
self,
localpart=None,
password=None,
generate_token=True,
guest_access_token=None,
make_guest=False,
admin=False,
threepid=None,
):
"""Registers a new client on the server.
Args:
localpart : The local part of the user ID to register. If None,
one will be generated.
password (unicode) : The password to assign to this user so they can
login again. This can be None which means they cannot login again
via a password (e.g. the user is an application service user).
generate_token (bool): Whether a new access token should be
generated. Having this be True should be considered deprecated,
since it offers no means of associating a device_id with the
access_token. Instead you should call auth_handler.issue_access_token
after registration.
Returns:
A tuple of (user_id, access_token).
Raises:
RegistrationError if there was a problem registering.
"""
yield self.auth.check_auth_blocking(threepid=threepid)
password_hash = None
if password:
password_hash = yield self.auth_handler().hash(password)
if localpart:
yield self.check_username(localpart, guest_access_token=guest_access_token)
was_guest = guest_access_token is not None
if not was_guest:
try:
int(localpart)
raise RegistrationError(
400,
"Numeric user IDs are reserved for guest users."
)
except ValueError:
pass
user = UserID(localpart, self.hs.hostname)
user_id = user.to_string()
token = None
if generate_token:
token = self.macaroon_gen.generate_access_token(user_id)
yield self.store.register(
user_id=user_id,
token=token,
password_hash=password_hash,
was_guest=was_guest,
make_guest=make_guest,
create_profile_with_localpart=(
# If the user was a guest then they already have a profile
None if was_guest else user.localpart
),
admin=admin,
)
if self.hs.config.user_directory_search_all_users:
profile = yield self.store.get_profileinfo(localpart)
yield self.user_directory_handler.handle_local_profile_change(
user_id, profile
)
else:
# autogen a sequential user ID
attempts = 0
token = None
user = None
while not user:
localpart = yield self._generate_user_id(attempts > 0)
user = UserID(localpart, self.hs.hostname)
user_id = user.to_string()
yield self.check_user_id_not_appservice_exclusive(user_id)
if generate_token:
token = self.macaroon_gen.generate_access_token(user_id)
try:
yield self.store.register(
user_id=user_id,
token=token,
password_hash=password_hash,
make_guest=make_guest,
create_profile_with_localpart=user.localpart,
)
except SynapseError:
# if user id is taken, just generate another
user = None
user_id = None
token = None
attempts += 1
# auto-join the user to any rooms we're supposed to dump them into
fake_requester = create_requester(user_id)
for r in self.hs.config.auto_join_rooms:
try:
yield self._join_user_to_room(fake_requester, r)
except Exception as e:
logger.error("Failed to join new user to %r: %r", r, e)
# We used to generate default identicons here, but nowadays
# we want clients to generate their own as part of their branding
# rather than there being consistent matrix-wide ones, so we don't.
defer.returnValue((user_id, token))
@defer.inlineCallbacks
def appservice_register(self, user_localpart, as_token):
user = UserID(user_localpart, self.hs.hostname)
user_id = user.to_string()
service = self.store.get_app_service_by_token(as_token)
if not service:
raise AuthError(403, "Invalid application service token.")
if not service.is_interested_in_user(user_id):
raise SynapseError(
400, "Invalid user localpart for this application service.",
errcode=Codes.EXCLUSIVE
)
service_id = service.id if service.is_exclusive_user(user_id) else None
yield self.check_user_id_not_appservice_exclusive(
user_id, allowed_appservice=service
)
yield self.store.register(
user_id=user_id,
password_hash="",
appservice_id=service_id,
create_profile_with_localpart=user.localpart,
)
defer.returnValue(user_id)
@defer.inlineCallbacks
def check_recaptcha(self, ip, private_key, challenge, response):
"""
Checks a recaptcha is correct.
Used only by c/s api v1
"""
captcha_response = yield self._validate_captcha(
ip,
private_key,
challenge,
response
)
if not captcha_response["valid"]:
logger.info("Invalid captcha entered from %s. Error: %s",
ip, captcha_response["error_url"])
raise InvalidCaptchaError(
error_url=captcha_response["error_url"]
)
else:
logger.info("Valid captcha entered from %s", ip)
@defer.inlineCallbacks
def register_saml2(self, localpart):
"""
Registers email_id as SAML2 Based Auth.
"""
if types.contains_invalid_mxid_characters(localpart):
raise SynapseError(
400,
"User ID can only contain characters a-z, 0-9, or '=_-./'",
)
yield self.auth.check_auth_blocking()
user = UserID(localpart, self.hs.hostname)
user_id = user.to_string()
yield self.check_user_id_not_appservice_exclusive(user_id)
token = self.macaroon_gen.generate_access_token(user_id)
try:
yield self.store.register(
user_id=user_id,
token=token,
password_hash=None,
create_profile_with_localpart=user.localpart,
)
except Exception as e:
yield self.store.add_access_token_to_user(user_id, token)
# Ignore Registration errors
logger.exception(e)
defer.returnValue((user_id, token))
@defer.inlineCallbacks
def register_email(self, threepidCreds):
"""
Registers emails with an identity server.
Used only by c/s api v1
"""
for c in threepidCreds:
logger.info("validating threepidcred sid %s on id server %s",
c['sid'], c['idServer'])
try:
identity_handler = self.hs.get_handlers().identity_handler
threepid = yield identity_handler.threepid_from_creds(c)
except Exception:
logger.exception("Couldn't validate 3pid")
raise RegistrationError(400, "Couldn't validate 3pid")
if not threepid:
raise RegistrationError(400, "Couldn't validate 3pid")
logger.info("got threepid with medium '%s' and address '%s'",
threepid['medium'], threepid['address'])
if not check_3pid_allowed(self.hs, threepid['medium'], threepid['address']):
raise RegistrationError(
403, "Third party identifier is not allowed"
)
@defer.inlineCallbacks
def bind_emails(self, user_id, threepidCreds):
"""Links emails with a user ID and informs an identity server.
Used only by c/s api v1
"""
# Now we have a matrix ID, bind it to the threepids we were given
for c in threepidCreds:
identity_handler = self.hs.get_handlers().identity_handler
# XXX: This should be a deferred list, shouldn't it?
yield identity_handler.bind_threepid(c, user_id)
def check_user_id_not_appservice_exclusive(self, user_id, allowed_appservice=None):
# don't allow people to register the server notices mxid
if self._server_notices_mxid is not None:
if user_id == self._server_notices_mxid:
raise SynapseError(
400, "This user ID is reserved.",
errcode=Codes.EXCLUSIVE
)
# valid user IDs must not clash with any user ID namespaces claimed by
# application services.
services = self.store.get_app_services()
interested_services = [
s for s in services
if s.is_interested_in_user(user_id)
and s != allowed_appservice
]
for service in interested_services:
if service.is_exclusive_user(user_id):
raise SynapseError(
400, "This user ID is reserved by an application service.",
errcode=Codes.EXCLUSIVE
)
@defer.inlineCallbacks
def _generate_user_id(self, reseed=False):
if reseed or self._next_generated_user_id is None:
with (yield self._generate_user_id_linearizer.queue(())):
if reseed or self._next_generated_user_id is None:
self._next_generated_user_id = (
yield self.store.find_next_generated_user_id_localpart()
)
id = self._next_generated_user_id
self._next_generated_user_id += 1
defer.returnValue(str(id))
@defer.inlineCallbacks
def _validate_captcha(self, ip_addr, private_key, challenge, response):
"""Validates the captcha provided.
Used only by c/s api v1
Returns:
dict: Containing 'valid'(bool) and 'error_url'(str) if invalid.
"""
response = yield self._submit_captcha(ip_addr, private_key, challenge,
response)
# parse Google's response. Lovely format..
lines = response.split('\n')
json = {
"valid": lines[0] == 'true',
"error_url": "http://www.google.com/recaptcha/api/challenge?" +
"error=%s" % lines[1]
}
defer.returnValue(json)
@defer.inlineCallbacks
def _submit_captcha(self, ip_addr, private_key, challenge, response):
"""
Used only by c/s api v1
"""
data = yield self.captcha_client.post_urlencoded_get_raw(
"http://www.google.com:80/recaptcha/api/verify",
args={
'privatekey': private_key,
'remoteip': ip_addr,
'challenge': challenge,
'response': response
}
)
defer.returnValue(data)
@defer.inlineCallbacks
def get_or_create_user(self, requester, localpart, displayname,
password_hash=None):
"""Creates a new user if the user does not exist,
else revokes all previous access tokens and generates a new one.
Args:
localpart : The local part of the user ID to register. If None,
one will be randomly generated.
Returns:
A tuple of (user_id, access_token).
Raises:
RegistrationError if there was a problem registering.
"""
if localpart is None:
raise SynapseError(400, "Request must include user id")
yield self.auth.check_auth_blocking()
need_register = True
try:
yield self.check_username(localpart)
except SynapseError as e:
if e.errcode == Codes.USER_IN_USE:
need_register = False
else:
raise
user = UserID(localpart, self.hs.hostname)
user_id = user.to_string()
token = self.macaroon_gen.generate_access_token(user_id)
if need_register:
yield self.store.register(
user_id=user_id,
token=token,
password_hash=password_hash,
create_profile_with_localpart=user.localpart,
)
else:
yield self._auth_handler.delete_access_tokens_for_user(user_id)
yield self.store.add_access_token_to_user(user_id=user_id, token=token)
if displayname is not None:
logger.info("setting user display name: %s -> %s", user_id, displayname)
yield self.profile_handler.set_displayname(
user, requester, displayname, by_admin=True,
)
defer.returnValue((user_id, token))
def auth_handler(self):
return self.hs.get_auth_handler()
@defer.inlineCallbacks
def get_or_register_3pid_guest(self, medium, address, inviter_user_id):
"""Get a guest access token for a 3PID, creating a guest account if
one doesn't already exist.
Args:
medium (str)
address (str)
inviter_user_id (str): The user ID who is trying to invite the
3PID
Returns:
Deferred[(str, str)]: A 2-tuple of `(user_id, access_token)` of the
3PID guest account.
"""
access_token = yield self.store.get_3pid_guest_access_token(medium, address)
if access_token:
user_info = yield self.auth.get_user_by_access_token(
access_token
)
defer.returnValue((user_info["user"].to_string(), access_token))
user_id, access_token = yield self.register(
generate_token=True,
make_guest=True
)
access_token = yield self.store.save_or_get_3pid_guest_access_token(
medium, address, access_token, inviter_user_id
)
defer.returnValue((user_id, access_token))
@defer.inlineCallbacks
def _join_user_to_room(self, requester, room_identifier):
room_id = None
room_member_handler = self.hs.get_room_member_handler()
if RoomID.is_valid(room_identifier):
room_id = room_identifier
elif RoomAlias.is_valid(room_identifier):
room_alias = RoomAlias.from_string(room_identifier)
room_id, remote_room_hosts = (
yield room_member_handler.lookup_room_alias(room_alias)
)
room_id = room_id.to_string()
else:
raise SynapseError(400, "%s was not legal room ID or room alias" % (
room_identifier,
))
yield room_member_handler.update_membership(
requester=requester,
target=requester.user,
room_id=room_id,
remote_room_hosts=remote_room_hosts,
action="join",
ratelimit=False,
)