summary refs log tree commit diff
path: root/synapse/handlers/register.py
blob: 46d1949373484a2bf84c7fd1cff4bd807e35a8e8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
# -*- 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)