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# -*- coding: utf-8 -*-
# Copyright 2014 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."""
from twisted.internet import defer
from synapse.types import UserID
from synapse.api.errors import (
SynapseError, RegistrationError, InvalidCaptchaError
)
from ._base import BaseHandler
import synapse.util.stringutils as stringutils
from synapse.http.client import SimpleHttpClient
from synapse.http.client import CaptchaServerHttpClient
import base64
import bcrypt
import logging
logger = logging.getLogger(__name__)
class RegistrationHandler(BaseHandler):
def __init__(self, hs):
super(RegistrationHandler, self).__init__(hs)
self.distributor = hs.get_distributor()
self.distributor.declare("registered_user")
@defer.inlineCallbacks
def register(self, localpart=None, password=None):
"""Registers a new client on the server.
Args:
localpart : The local part of the user ID to register. If None,
one will be randomly generated.
password (str) : The password to assign to this user so they can
login again.
Returns:
A tuple of (user_id, access_token).
Raises:
RegistrationError if there was a problem registering.
"""
password_hash = None
if password:
password_hash = bcrypt.hashpw(password, bcrypt.gensalt())
if localpart:
user = UserID(localpart, self.hs.hostname, True)
user_id = user.to_string()
token = self._generate_token(user_id)
yield self.store.register(
user_id=user_id,
token=token,
password_hash=password_hash
)
self.distributor.fire("registered_user", user)
else:
# autogen a random user ID
attempts = 0
user_id = None
token = None
while not user_id and not token:
try:
localpart = self._generate_user_id()
user = UserID(localpart, self.hs.hostname, True)
user_id = user.to_string()
token = self._generate_token(user_id)
yield self.store.register(
user_id=user_id,
token=token,
password_hash=password_hash)
self.distributor.fire("registered_user", user)
except SynapseError:
# if user id is taken, just generate another
user_id = None
token = None
attempts += 1
if attempts > 5:
raise RegistrationError(
500, "Cannot generate user ID.")
defer.returnValue((user_id, token))
@defer.inlineCallbacks
def check_recaptcha(self, ip, private_key, challenge, response):
"""Checks a recaptcha is correct."""
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_email(self, threepidCreds):
"""Registers emails with an identity server."""
for c in threepidCreds:
logger.info("validating theeepidcred sid %s on id server %s",
c['sid'], c['idServer'])
try:
threepid = yield self._threepid_from_creds(c)
except:
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 medium %s address %s",
threepid['medium'], threepid['address'])
@defer.inlineCallbacks
def bind_emails(self, user_id, threepidCreds):
"""Links emails with a user ID and informs an identity server."""
# Now we have a matrix ID, bind it to the threepids we were given
for c in threepidCreds:
# XXX: This should be a deferred list, shouldn't it?
yield self._bind_threepid(c, user_id)
def _generate_token(self, user_id):
# urlsafe variant uses _ and - so use . as the separator and replace
# all =s with .s so http clients don't quote =s when it is used as
# query params.
return (base64.urlsafe_b64encode(user_id).replace('=', '.') + '.' +
stringutils.random_string(18))
def _generate_user_id(self):
return "-" + stringutils.random_string(18)
@defer.inlineCallbacks
def _threepid_from_creds(self, creds):
# TODO: get this from the homeserver rather than creating a new one for
# each request
httpCli = SimpleHttpClient(self.hs)
# XXX: make this configurable!
trustedIdServers = ['matrix.org:8090']
if not creds['idServer'] in trustedIdServers:
logger.warn('%s is not a trusted ID server: rejecting 3pid ' +
'credentials', creds['idServer'])
defer.returnValue(None)
data = yield httpCli.get_json(
creds['idServer'],
"/_matrix/identity/api/v1/3pid/getValidated3pid",
{'sid': creds['sid'], 'clientSecret': creds['clientSecret']}
)
if 'medium' in data:
defer.returnValue(data)
defer.returnValue(None)
@defer.inlineCallbacks
def _bind_threepid(self, creds, mxid):
httpCli = SimpleHttpClient(self.hs)
data = yield httpCli.post_urlencoded_get_json(
creds['idServer'],
"/_matrix/identity/api/v1/3pid/bind",
{
'sid': creds['sid'],
'clientSecret': creds['clientSecret'],
'mxid': mxid,
}
)
defer.returnValue(data)
@defer.inlineCallbacks
def _validate_captcha(self, ip_addr, private_key, challenge, response):
"""Validates the captcha provided.
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):
# TODO: get this from the homeserver rather than creating a new one for
# each request
client = CaptchaServerHttpClient(self.hs)
data = yield client.post_urlencoded_get_raw(
"www.google.com:80",
"/recaptcha/api/verify",
args={
'privatekey': private_key,
'remoteip': ip_addr,
'challenge': challenge,
'response': response
}
)
defer.returnValue(data)
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