summary refs log tree commit diff
path: root/synapse/rest/client/v2_alpha/register.py
blob: 68d18a9b82536280fd8e49fcd2d509667bd9e5f7 (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
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
# -*- coding: utf-8 -*-
# Copyright 2015 - 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.

from twisted.internet import defer

from synapse.api.auth import get_access_token_from_request, has_access_token
from synapse.api.constants import LoginType
from synapse.api.errors import SynapseError, Codes, UnrecognizedRequestError
from synapse.http.servlet import RestServlet, parse_json_object_from_request

from ._base import client_v2_patterns

import logging
import hmac
from hashlib import sha1
from synapse.util.async import run_on_reactor


# 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 RegisterRequestTokenRestServlet(RestServlet):
    PATTERNS = client_v2_patterns("/register/email/requestToken$")

    def __init__(self, hs):
        """
        Args:
            hs (synapse.server.HomeServer): server
        """
        super(RegisterRequestTokenRestServlet, 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)

        required = ['id_server', 'client_secret', 'email', 'send_attempt']
        absent = []
        for k in required:
            if k not in body:
                absent.append(k)

        if len(absent) > 0:
            raise SynapseError(400, "Missing params: %r" % absent, Codes.MISSING_PARAM)

        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 RegisterRestServlet(RestServlet):
    PATTERNS = client_v2_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_handlers().registration_handler
        self.identity_handler = hs.get_handlers().identity_handler
        self.device_handler = hs.get_device_handler()

    @defer.inlineCallbacks
    def on_POST(self, request):
        yield run_on_reactor()

        kind = "user"
        if "kind" in request.args:
            kind = request.args["kind"][0]

        if kind == "guest":
            ret = yield self._do_guest_registration()
            defer.returnValue(ret)
            return
        elif kind != "user":
            raise UnrecognizedRequestError(
                "Do not understand membership kind: %s" % (kind,)
            )

        body = parse_json_object_from_request(request)

        # 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'], basestring) 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'], basestring) or
                    len(body['username']) > 512):
                raise SynapseError(400, "Invalid username")
            desired_username = body['username']

        appservice = None
        if 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)
            access_token = get_access_token_from_request(request)

            if isinstance(desired_username, basestring):
                result = yield self._do_appservice_registration(
                    desired_username, access_token, body
                )
            defer.returnValue((200, result))  # we throw for non 200 responses
            return

        # == 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)

        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,
            )

        if self.hs.config.enable_registration_captcha:
            flows = [
                [LoginType.RECAPTCHA],
                [LoginType.EMAIL_IDENTITY, LoginType.RECAPTCHA]
            ]
        else:
            flows = [
                [LoginType.DUMMY],
                [LoginType.EMAIL_IDENTITY]
            ]

        authed, auth_result, params, session_id = yield self.auth_handler.check_auth(
            flows, body, self.hs.get_ip_from_request(request)
        )

        if not authed:
            defer.returnValue((401, auth_result))
            return

        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 email address
            add_email = False
        else:
            # NB: This may be from the auth handler and NOT from the POST
            if 'password' not in params:
                raise SynapseError(400, "Missing password.",
                                   Codes.MISSING_PARAM)

            desired_username = params.get("username", None)
            new_password = params.get("password", None)
            guest_access_token = params.get("guest_access_token", None)

            (registered_user_id, _) = yield self.registration_handler.register(
                localpart=desired_username,
                password=new_password,
                guest_access_token=guest_access_token,
                generate_token=False,
            )

            # 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
            )

            add_email = True

        return_dict = yield self._create_registration_details(
            registered_user_id, params
        )

        if add_email and auth_result and LoginType.EMAIL_IDENTITY in auth_result:
            threepid = auth_result[LoginType.EMAIL_IDENTITY]
            yield self._register_email_threepid(
                registered_user_id, threepid, return_dict["access_token"],
                params.get("bind_email")
            )

        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")

        user = username.encode("utf-8")

        # str() because otherwise hmac complains that 'unicode' does not
        # have the buffer interface
        got_mac = str(body["mac"])

        want_mac = hmac.new(
            key=self.hs.config.registration_shared_secret,
            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(
            localpart=username, password=password, generate_token=False,
        )

        result = yield self._create_registration_details(user_id, body)
        defer.returnValue(result)

    @defer.inlineCallbacks
    def _register_email_threepid(self, user_id, threepid, token, bind_email):
        """Add an email address as a 3pid identifier

        Also adds an email pusher for the email address, if configured in the
        HS config

        Also optionally binds emails to the given user_id on the identity server

        Args:
            user_id (str): id of user
            threepid (object): m.login.email.identity auth response
            token (str): access_token for the user
            bind_email (bool): true if the client requested the email to be
                bound at the identity server
        Returns:
            defer.Deferred:
        """
        reqd = ('medium', 'address', 'validated_at')
        if any(x not in threepid for x in reqd):
            logger.info("Can't add incomplete 3pid")
            defer.returnValue()

        yield self.auth_handler.add_threepid(
            user_id,
            threepid['medium'],
            threepid['address'],
            threepid['validated_at'],
        )

        # And we add an email pusher for them by default, but only
        # if email notifications are enabled (so people don't start
        # getting mail spam where they weren't before if email
        # notifs are set up on a home server)
        if (self.hs.config.email_enable_notifs and
                self.hs.config.email_notif_for_new_users):
            # Pull the ID of the access token back out of the db
            # It would really make more sense for this to be passed
            # up when the access token is saved, but that's quite an
            # invasive change I'd rather do separately.
            user_tuple = yield self.store.get_user_by_access_token(
                token
            )
            token_id = user_tuple["token_id"]

            yield self.hs.get_pusherpool().add_pusher(
                user_id=user_id,
                access_token=token_id,
                kind="email",
                app_id="m.email",
                app_display_name="Email Notifications",
                device_display_name=threepid["address"],
                pushkey=threepid["address"],
                lang=None,  # We don't know a user's language here
                data={},
            )

        if bind_email:
            logger.info("bind_email specified: binding")
            logger.debug("Binding emails %s to %s" % (
                threepid, user_id
            ))
            yield self.identity_handler.bind_threepid(
                threepid['threepid_creds'], user_id
            )
        else:
            logger.info("bind_email not specified: not binding email")

    @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
        and refresh_token.

        Args:
            (str) user_id: full canonical @user:id
            (object) params: registration parameters, from which we pull
                device_id and initial_device_name
        Returns:
            defer.Deferred: (object) dictionary for response from /register
        """
        device_id = yield self._register_device(user_id, params)

        access_token, refresh_token = (
            yield self.auth_handler.get_login_tuple_for_user_id(
                user_id, device_id=device_id,
                initial_display_name=params.get("initial_device_display_name")
            )
        )

        defer.returnValue({
            "user_id": user_id,
            "access_token": access_token,
            "home_server": self.hs.hostname,
            "refresh_token": refresh_token,
            "device_id": device_id,
        })

    def _register_device(self, user_id, params):
        """Register a device for a user.

        This is called after the user's credentials have been validated, but
        before the access token has been issued.

        Args:
            (str) user_id: full canonical @user:id
            (object) params: registration parameters, from which we pull
                device_id and initial_device_name
        Returns:
            defer.Deferred: (str) device_id
        """
        # register the user's device
        device_id = params.get("device_id")
        initial_display_name = params.get("initial_device_display_name")
        return self.device_handler.check_device_registered(
            user_id, device_id, initial_display_name
        )

    @defer.inlineCallbacks
    def _do_guest_registration(self):
        if not self.hs.config.allow_guest_access:
            defer.returnValue((403, "Guest access is disabled"))
        user_id, _ = yield self.registration_handler.register(
            generate_token=False,
            make_guest=True
        )
        access_token = self.auth_handler.generate_access_token(
            user_id, ["guest = true"]
        )
        # XXX the "guest" caveat is not copied by /tokenrefresh. That's ok
        # so long as we don't return a refresh_token here.
        defer.returnValue((200, {
            "user_id": user_id,
            "access_token": access_token,
            "home_server": self.hs.hostname,
        }))


def register_servlets(hs, http_server):
    RegisterRequestTokenRestServlet(hs).register(http_server)
    RegisterRestServlet(hs).register(http_server)