forked-synapse/synapse/rest/client/v2_alpha/register.py
Richard van der Hoff 824707383b
Remove access-token support from RegistrationHandler.register (#5641)
Nothing uses this now, so we can remove the dead code, and clean up the
API.

Since we're changing the shape of the return value anyway, we take the
opportunity to give the method a better name.
2019-07-08 19:01:08 +01:00

609 lines
23 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2015 - 2016 OpenMarket Ltd
# Copyright 2017 Vector Creations 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.
import hmac
import logging
from hashlib import sha1
from six import string_types
from twisted.internet import defer
import synapse
import synapse.types
from synapse.api.constants import LoginType
from synapse.api.errors import (
Codes,
LimitExceededError,
SynapseError,
UnrecognizedRequestError,
)
from synapse.config.ratelimiting import FederationRateLimitConfig
from synapse.config.server import is_threepid_reserved
from synapse.http.servlet import (
RestServlet,
assert_params_in_dict,
parse_json_object_from_request,
parse_string,
)
from synapse.util.msisdn import phone_number_to_msisdn
from synapse.util.ratelimitutils import FederationRateLimiter
from synapse.util.threepids import check_3pid_allowed
from ._base import client_patterns, interactive_auth_handler
# We ought to be using hmac.compare_digest() but on older pythons it doesn't
# exist. It's a _really minor_ security flaw to use plain string comparison
# because the timing attack is so obscured by all the other code here it's
# unlikely to make much difference
if hasattr(hmac, "compare_digest"):
compare_digest = hmac.compare_digest
else:
def compare_digest(a, b):
return a == b
logger = logging.getLogger(__name__)
class EmailRegisterRequestTokenRestServlet(RestServlet):
PATTERNS = client_patterns("/register/email/requestToken$")
def __init__(self, hs):
"""
Args:
hs (synapse.server.HomeServer): server
"""
super(EmailRegisterRequestTokenRestServlet, self).__init__()
self.hs = hs
self.identity_handler = hs.get_handlers().identity_handler
@defer.inlineCallbacks
def on_POST(self, request):
body = parse_json_object_from_request(request)
assert_params_in_dict(
body, ["id_server", "client_secret", "email", "send_attempt"]
)
if not check_3pid_allowed(self.hs, "email", body["email"]):
raise SynapseError(
403,
"Your email domain is not authorized to register on this server",
Codes.THREEPID_DENIED,
)
existingUid = yield self.hs.get_datastore().get_user_id_by_threepid(
"email", body["email"]
)
if existingUid is not None:
raise SynapseError(400, "Email is already in use", Codes.THREEPID_IN_USE)
ret = yield self.identity_handler.requestEmailToken(**body)
defer.returnValue((200, ret))
class MsisdnRegisterRequestTokenRestServlet(RestServlet):
PATTERNS = client_patterns("/register/msisdn/requestToken$")
def __init__(self, hs):
"""
Args:
hs (synapse.server.HomeServer): server
"""
super(MsisdnRegisterRequestTokenRestServlet, self).__init__()
self.hs = hs
self.identity_handler = hs.get_handlers().identity_handler
@defer.inlineCallbacks
def on_POST(self, request):
body = parse_json_object_from_request(request)
assert_params_in_dict(
body,
["id_server", "client_secret", "country", "phone_number", "send_attempt"],
)
msisdn = phone_number_to_msisdn(body["country"], body["phone_number"])
if not check_3pid_allowed(self.hs, "msisdn", msisdn):
raise SynapseError(
403,
"Phone numbers are not authorized to register on this server",
Codes.THREEPID_DENIED,
)
existingUid = yield self.hs.get_datastore().get_user_id_by_threepid(
"msisdn", msisdn
)
if existingUid is not None:
raise SynapseError(
400, "Phone number is already in use", Codes.THREEPID_IN_USE
)
ret = yield self.identity_handler.requestMsisdnToken(**body)
defer.returnValue((200, ret))
class UsernameAvailabilityRestServlet(RestServlet):
PATTERNS = client_patterns("/register/available")
def __init__(self, hs):
"""
Args:
hs (synapse.server.HomeServer): server
"""
super(UsernameAvailabilityRestServlet, self).__init__()
self.hs = hs
self.registration_handler = hs.get_registration_handler()
self.ratelimiter = FederationRateLimiter(
hs.get_clock(),
FederationRateLimitConfig(
# Time window of 2s
window_size=2000,
# Artificially delay requests if rate > sleep_limit/window_size
sleep_limit=1,
# Amount of artificial delay to apply
sleep_msec=1000,
# Error with 429 if more than reject_limit requests are queued
reject_limit=1,
# Allow 1 request at a time
concurrent_requests=1,
),
)
@defer.inlineCallbacks
def on_GET(self, request):
ip = self.hs.get_ip_from_request(request)
with self.ratelimiter.ratelimit(ip) as wait_deferred:
yield wait_deferred
username = parse_string(request, "username", required=True)
yield self.registration_handler.check_username(username)
defer.returnValue((200, {"available": True}))
class RegisterRestServlet(RestServlet):
PATTERNS = client_patterns("/register$")
def __init__(self, hs):
"""
Args:
hs (synapse.server.HomeServer): server
"""
super(RegisterRestServlet, self).__init__()
self.hs = hs
self.auth = hs.get_auth()
self.store = hs.get_datastore()
self.auth_handler = hs.get_auth_handler()
self.registration_handler = hs.get_registration_handler()
self.identity_handler = hs.get_handlers().identity_handler
self.room_member_handler = hs.get_room_member_handler()
self.macaroon_gen = hs.get_macaroon_generator()
self.ratelimiter = hs.get_registration_ratelimiter()
self.clock = hs.get_clock()
@interactive_auth_handler
@defer.inlineCallbacks
def on_POST(self, request):
body = parse_json_object_from_request(request)
client_addr = request.getClientIP()
time_now = self.clock.time()
allowed, time_allowed = self.ratelimiter.can_do_action(
client_addr,
time_now_s=time_now,
rate_hz=self.hs.config.rc_registration.per_second,
burst_count=self.hs.config.rc_registration.burst_count,
update=False,
)
if not allowed:
raise LimitExceededError(
retry_after_ms=int(1000 * (time_allowed - time_now))
)
kind = b"user"
if b"kind" in request.args:
kind = request.args[b"kind"][0]
if kind == b"guest":
ret = yield self._do_guest_registration(body, address=client_addr)
defer.returnValue(ret)
return
elif kind != b"user":
raise UnrecognizedRequestError(
"Do not understand membership kind: %s" % (kind,)
)
# we do basic sanity checks here because the auth layer will store these
# in sessions. Pull out the username/password provided to us.
desired_password = None
if "password" in body:
if (
not isinstance(body["password"], string_types)
or len(body["password"]) > 512
):
raise SynapseError(400, "Invalid password")
desired_password = body["password"]
desired_username = None
if "username" in body:
if (
not isinstance(body["username"], string_types)
or len(body["username"]) > 512
):
raise SynapseError(400, "Invalid username")
desired_username = body["username"]
appservice = None
if self.auth.has_access_token(request):
appservice = yield self.auth.get_appservice_by_req(request)
# fork off as soon as possible for ASes and shared secret auth which
# have completely different registration flows to normal users
# == Application Service Registration ==
if appservice:
# Set the desired user according to the AS API (which uses the
# 'user' key not 'username'). Since this is a new addition, we'll
# fallback to 'username' if they gave one.
desired_username = body.get("user", desired_username)
# XXX we should check that desired_username is valid. Currently
# we give appservices carte blanche for any insanity in mxids,
# because the IRC bridges rely on being able to register stupid
# IDs.
access_token = self.auth.get_access_token_from_request(request)
if isinstance(desired_username, string_types):
result = yield self._do_appservice_registration(
desired_username, access_token, body
)
defer.returnValue((200, result)) # we throw for non 200 responses
return
# for either shared secret or regular registration, downcase the
# provided username before attempting to register it. This should mean
# that people who try to register with upper-case in their usernames
# don't get a nasty surprise. (Note that we treat username
# case-insenstively in login, so they are free to carry on imagining
# that their username is CrAzYh4cKeR if that keeps them happy)
if desired_username is not None:
desired_username = desired_username.lower()
# == Shared Secret Registration == (e.g. create new user scripts)
if "mac" in body:
# FIXME: Should we really be determining if this is shared secret
# auth based purely on the 'mac' key?
result = yield self._do_shared_secret_registration(
desired_username, desired_password, body
)
defer.returnValue((200, result)) # we throw for non 200 responses
return
# == Normal User Registration == (everyone else)
if not self.hs.config.enable_registration:
raise SynapseError(403, "Registration has been disabled")
guest_access_token = body.get("guest_access_token", None)
if "initial_device_display_name" in body and "password" not in body:
# ignore 'initial_device_display_name' if sent without
# a password to work around a client bug where it sent
# the 'initial_device_display_name' param alone, wiping out
# the original registration params
logger.warn("Ignoring initial_device_display_name without password")
del body["initial_device_display_name"]
session_id = self.auth_handler.get_session_id(body)
registered_user_id = None
if session_id:
# if we get a registered user id out of here, it means we previously
# registered a user for this session, so we could just return the
# user here. We carry on and go through the auth checks though,
# for paranoia.
registered_user_id = self.auth_handler.get_session_data(
session_id, "registered_user_id", None
)
if desired_username is not None:
yield self.registration_handler.check_username(
desired_username,
guest_access_token=guest_access_token,
assigned_user_id=registered_user_id,
)
# FIXME: need a better error than "no auth flow found" for scenarios
# where we required 3PID for registration but the user didn't give one
require_email = "email" in self.hs.config.registrations_require_3pid
require_msisdn = "msisdn" in self.hs.config.registrations_require_3pid
show_msisdn = True
if self.hs.config.disable_msisdn_registration:
show_msisdn = False
require_msisdn = False
flows = []
if self.hs.config.enable_registration_captcha:
# only support 3PIDless registration if no 3PIDs are required
if not require_email and not require_msisdn:
# Also add a dummy flow here, otherwise if a client completes
# recaptcha first we'll assume they were going for this flow
# and complete the request, when they could have been trying to
# complete one of the flows with email/msisdn auth.
flows.extend([[LoginType.RECAPTCHA, LoginType.DUMMY]])
# only support the email-only flow if we don't require MSISDN 3PIDs
if not require_msisdn:
flows.extend([[LoginType.RECAPTCHA, LoginType.EMAIL_IDENTITY]])
if show_msisdn:
# only support the MSISDN-only flow if we don't require email 3PIDs
if not require_email:
flows.extend([[LoginType.RECAPTCHA, LoginType.MSISDN]])
# always let users provide both MSISDN & email
flows.extend(
[[LoginType.RECAPTCHA, LoginType.MSISDN, LoginType.EMAIL_IDENTITY]]
)
else:
# only support 3PIDless registration if no 3PIDs are required
if not require_email and not require_msisdn:
flows.extend([[LoginType.DUMMY]])
# only support the email-only flow if we don't require MSISDN 3PIDs
if not require_msisdn:
flows.extend([[LoginType.EMAIL_IDENTITY]])
if show_msisdn:
# only support the MSISDN-only flow if we don't require email 3PIDs
if not require_email or require_msisdn:
flows.extend([[LoginType.MSISDN]])
# always let users provide both MSISDN & email
flows.extend([[LoginType.MSISDN, LoginType.EMAIL_IDENTITY]])
# Append m.login.terms to all flows if we're requiring consent
if self.hs.config.user_consent_at_registration:
new_flows = []
for flow in flows:
inserted = False
# m.login.terms should go near the end but before msisdn or email auth
for i, stage in enumerate(flow):
if stage == LoginType.EMAIL_IDENTITY or stage == LoginType.MSISDN:
flow.insert(i, LoginType.TERMS)
inserted = True
break
if not inserted:
flow.append(LoginType.TERMS)
flows.extend(new_flows)
auth_result, params, session_id = yield self.auth_handler.check_auth(
flows, body, self.hs.get_ip_from_request(request)
)
# Check that we're not trying to register a denied 3pid.
#
# the user-facing checks will probably already have happened in
# /register/email/requestToken when we requested a 3pid, but that's not
# guaranteed.
if auth_result:
for login_type in [LoginType.EMAIL_IDENTITY, LoginType.MSISDN]:
if login_type in auth_result:
medium = auth_result[login_type]["medium"]
address = auth_result[login_type]["address"]
if not check_3pid_allowed(self.hs, medium, address):
raise SynapseError(
403,
"Third party identifiers (email/phone numbers)"
+ " are not authorized on this server",
Codes.THREEPID_DENIED,
)
if registered_user_id is not None:
logger.info(
"Already registered user ID %r for this session", registered_user_id
)
# don't re-register the threepids
registered = False
else:
# NB: This may be from the auth handler and NOT from the POST
assert_params_in_dict(params, ["password"])
desired_username = params.get("username", None)
guest_access_token = params.get("guest_access_token", None)
new_password = params.get("password", None)
if desired_username is not None:
desired_username = desired_username.lower()
threepid = None
if auth_result:
threepid = auth_result.get(LoginType.EMAIL_IDENTITY)
# Also check that we're not trying to register a 3pid that's already
# been registered.
#
# This has probably happened in /register/email/requestToken as well,
# but if a user hits this endpoint twice then clicks on each link from
# the two activation emails, they would register the same 3pid twice.
for login_type in [LoginType.EMAIL_IDENTITY, LoginType.MSISDN]:
if login_type in auth_result:
medium = auth_result[login_type]["medium"]
address = auth_result[login_type]["address"]
existingUid = yield self.store.get_user_id_by_threepid(
medium, address
)
if existingUid is not None:
raise SynapseError(
400,
"%s is already in use" % medium,
Codes.THREEPID_IN_USE,
)
registered_user_id = yield self.registration_handler.register_user(
localpart=desired_username,
password=new_password,
guest_access_token=guest_access_token,
threepid=threepid,
address=client_addr,
)
# Necessary due to auth checks prior to the threepid being
# written to the db
if threepid:
if is_threepid_reserved(
self.hs.config.mau_limits_reserved_threepids, threepid
):
yield self.store.upsert_monthly_active_user(registered_user_id)
# remember that we've now registered that user account, and with
# what user ID (since the user may not have specified)
self.auth_handler.set_session_data(
session_id, "registered_user_id", registered_user_id
)
registered = True
return_dict = yield self._create_registration_details(
registered_user_id, params
)
if registered:
yield self.registration_handler.post_registration_actions(
user_id=registered_user_id,
auth_result=auth_result,
access_token=return_dict.get("access_token"),
bind_email=params.get("bind_email"),
bind_msisdn=params.get("bind_msisdn"),
)
defer.returnValue((200, return_dict))
def on_OPTIONS(self, _):
return 200, {}
@defer.inlineCallbacks
def _do_appservice_registration(self, username, as_token, body):
user_id = yield self.registration_handler.appservice_register(
username, as_token
)
defer.returnValue((yield self._create_registration_details(user_id, body)))
@defer.inlineCallbacks
def _do_shared_secret_registration(self, username, password, body):
if not self.hs.config.registration_shared_secret:
raise SynapseError(400, "Shared secret registration is not enabled")
if not username:
raise SynapseError(
400, "username must be specified", errcode=Codes.BAD_JSON
)
# use the username from the original request rather than the
# downcased one in `username` for the mac calculation
user = body["username"].encode("utf-8")
# str() because otherwise hmac complains that 'unicode' does not
# have the buffer interface
got_mac = str(body["mac"])
# FIXME this is different to the /v1/register endpoint, which
# includes the password and admin flag in the hashed text. Why are
# these different?
want_mac = hmac.new(
key=self.hs.config.registration_shared_secret.encode(),
msg=user,
digestmod=sha1,
).hexdigest()
if not compare_digest(want_mac, got_mac):
raise SynapseError(403, "HMAC incorrect")
user_id = yield self.registration_handler.register_user(
localpart=username, password=password
)
result = yield self._create_registration_details(user_id, body)
defer.returnValue(result)
@defer.inlineCallbacks
def _create_registration_details(self, user_id, params):
"""Complete registration of newly-registered user
Allocates device_id if one was not given; also creates access_token.
Args:
(str) user_id: full canonical @user:id
(object) params: registration parameters, from which we pull
device_id, initial_device_name and inhibit_login
Returns:
defer.Deferred: (object) dictionary for response from /register
"""
result = {"user_id": user_id, "home_server": self.hs.hostname}
if not params.get("inhibit_login", False):
device_id = params.get("device_id")
initial_display_name = params.get("initial_device_display_name")
device_id, access_token = yield self.registration_handler.register_device(
user_id, device_id, initial_display_name, is_guest=False
)
result.update({"access_token": access_token, "device_id": device_id})
defer.returnValue(result)
@defer.inlineCallbacks
def _do_guest_registration(self, params, address=None):
if not self.hs.config.allow_guest_access:
raise SynapseError(403, "Guest access is disabled")
user_id = yield self.registration_handler.register_user(
make_guest=True, address=address
)
# we don't allow guests to specify their own device_id, because
# we have nowhere to store it.
device_id = synapse.api.auth.GUEST_DEVICE_ID
initial_display_name = params.get("initial_device_display_name")
device_id, access_token = yield self.registration_handler.register_device(
user_id, device_id, initial_display_name, is_guest=True
)
defer.returnValue(
(
200,
{
"user_id": user_id,
"device_id": device_id,
"access_token": access_token,
"home_server": self.hs.hostname,
},
)
)
def register_servlets(hs, http_server):
EmailRegisterRequestTokenRestServlet(hs).register(http_server)
MsisdnRegisterRequestTokenRestServlet(hs).register(http_server)
UsernameAvailabilityRestServlet(hs).register(http_server)
RegisterRestServlet(hs).register(http_server)