summary refs log tree commit diff
path: root/synapse/rest/client/v1/login.py
blob: 925edfc402390b9d5ba26f50cfc6dff913619b1c (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
435
436
437
438
439
440
441
442
443
444
445
446
# -*- 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.

import logging
from typing import TYPE_CHECKING, Awaitable, Callable, Dict, Optional

from synapse.api.errors import Codes, LoginError, SynapseError
from synapse.api.ratelimiting import Ratelimiter
from synapse.appservice import ApplicationService
from synapse.handlers.sso import SsoIdentityProvider
from synapse.http import get_request_uri
from synapse.http.server import HttpServer, finish_request
from synapse.http.servlet import (
    RestServlet,
    parse_json_object_from_request,
    parse_string,
)
from synapse.http.site import SynapseRequest
from synapse.rest.client.v2_alpha._base import client_patterns
from synapse.rest.well_known import WellKnownBuilder
from synapse.types import JsonDict, UserID

if TYPE_CHECKING:
    from synapse.server import HomeServer

logger = logging.getLogger(__name__)


class LoginRestServlet(RestServlet):
    PATTERNS = client_patterns("/login$", v1=True)
    CAS_TYPE = "m.login.cas"
    SSO_TYPE = "m.login.sso"
    TOKEN_TYPE = "m.login.token"
    JWT_TYPE = "org.matrix.login.jwt"
    JWT_TYPE_DEPRECATED = "m.login.jwt"
    APPSERVICE_TYPE = "uk.half-shot.msc2778.login.application_service"

    def __init__(self, hs: "HomeServer"):
        super().__init__()
        self.hs = hs

        # JWT configuration variables.
        self.jwt_enabled = hs.config.jwt_enabled
        self.jwt_secret = hs.config.jwt_secret
        self.jwt_algorithm = hs.config.jwt_algorithm
        self.jwt_issuer = hs.config.jwt_issuer
        self.jwt_audiences = hs.config.jwt_audiences

        # SSO configuration.
        self.saml2_enabled = hs.config.saml2_enabled
        self.cas_enabled = hs.config.cas_enabled
        self.oidc_enabled = hs.config.oidc_enabled
        self._msc2858_enabled = hs.config.experimental.msc2858_enabled

        self.auth = hs.get_auth()

        self.auth_handler = self.hs.get_auth_handler()
        self.registration_handler = hs.get_registration_handler()
        self._sso_handler = hs.get_sso_handler()

        self._well_known_builder = WellKnownBuilder(hs)
        self._address_ratelimiter = Ratelimiter(
            clock=hs.get_clock(),
            rate_hz=self.hs.config.rc_login_address.per_second,
            burst_count=self.hs.config.rc_login_address.burst_count,
        )
        self._account_ratelimiter = Ratelimiter(
            clock=hs.get_clock(),
            rate_hz=self.hs.config.rc_login_account.per_second,
            burst_count=self.hs.config.rc_login_account.burst_count,
        )

    def on_GET(self, request: SynapseRequest):
        flows = []
        if self.jwt_enabled:
            flows.append({"type": LoginRestServlet.JWT_TYPE})
            flows.append({"type": LoginRestServlet.JWT_TYPE_DEPRECATED})

        if self.cas_enabled:
            # we advertise CAS for backwards compat, though MSC1721 renamed it
            # to SSO.
            flows.append({"type": LoginRestServlet.CAS_TYPE})

        if self.cas_enabled or self.saml2_enabled or self.oidc_enabled:
            sso_flow = {"type": LoginRestServlet.SSO_TYPE}  # type: JsonDict

            if self._msc2858_enabled:
                sso_flow["org.matrix.msc2858.identity_providers"] = [
                    _get_auth_flow_dict_for_idp(idp)
                    for idp in self._sso_handler.get_identity_providers().values()
                ]

            flows.append(sso_flow)

            # While it's valid for us to advertise this login type generally,
            # synapse currently only gives out these tokens as part of the
            # SSO login flow.
            # Generally we don't want to advertise login flows that clients
            # don't know how to implement, since they (currently) will always
            # fall back to the fallback API if they don't understand one of the
            # login flow types returned.
            flows.append({"type": LoginRestServlet.TOKEN_TYPE})

        flows.extend(
            ({"type": t} for t in self.auth_handler.get_supported_login_types())
        )

        flows.append({"type": LoginRestServlet.APPSERVICE_TYPE})

        return 200, {"flows": flows}

    async def on_POST(self, request: SynapseRequest):
        login_submission = parse_json_object_from_request(request)

        try:
            if login_submission["type"] == LoginRestServlet.APPSERVICE_TYPE:
                appservice = self.auth.get_appservice_by_req(request)

                if appservice.is_rate_limited():
                    self._address_ratelimiter.ratelimit(request.getClientIP())

                result = await self._do_appservice_login(login_submission, appservice)
            elif self.jwt_enabled and (
                login_submission["type"] == LoginRestServlet.JWT_TYPE
                or login_submission["type"] == LoginRestServlet.JWT_TYPE_DEPRECATED
            ):
                self._address_ratelimiter.ratelimit(request.getClientIP())
                result = await self._do_jwt_login(login_submission)
            elif login_submission["type"] == LoginRestServlet.TOKEN_TYPE:
                self._address_ratelimiter.ratelimit(request.getClientIP())
                result = await self._do_token_login(login_submission)
            else:
                self._address_ratelimiter.ratelimit(request.getClientIP())
                result = await self._do_other_login(login_submission)
        except KeyError:
            raise SynapseError(400, "Missing JSON keys.")

        well_known_data = self._well_known_builder.get_well_known()
        if well_known_data:
            result["well_known"] = well_known_data
        return 200, result

    async def _do_appservice_login(
        self, login_submission: JsonDict, appservice: ApplicationService
    ):
        identifier = login_submission.get("identifier")
        logger.info("Got appservice login request with identifier: %r", identifier)

        if not isinstance(identifier, dict):
            raise SynapseError(
                400, "Invalid identifier in login submission", Codes.INVALID_PARAM
            )

        # this login flow only supports identifiers of type "m.id.user".
        if identifier.get("type") != "m.id.user":
            raise SynapseError(
                400, "Unknown login identifier type", Codes.INVALID_PARAM
            )

        user = identifier.get("user")
        if not isinstance(user, str):
            raise SynapseError(400, "Invalid user in identifier", Codes.INVALID_PARAM)

        if user.startswith("@"):
            qualified_user_id = user
        else:
            qualified_user_id = UserID(user, self.hs.hostname).to_string()

        if not appservice.is_interested_in_user(qualified_user_id):
            raise LoginError(403, "Invalid access_token", errcode=Codes.FORBIDDEN)

        return await self._complete_login(
            qualified_user_id, login_submission, ratelimit=appservice.is_rate_limited()
        )

    async def _do_other_login(self, login_submission: JsonDict) -> Dict[str, str]:
        """Handle non-token/saml/jwt logins

        Args:
            login_submission:

        Returns:
            HTTP response
        """
        # Log the request we got, but only certain fields to minimise the chance of
        # logging someone's password (even if they accidentally put it in the wrong
        # field)
        logger.info(
            "Got login request with identifier: %r, medium: %r, address: %r, user: %r",
            login_submission.get("identifier"),
            login_submission.get("medium"),
            login_submission.get("address"),
            login_submission.get("user"),
        )
        canonical_user_id, callback = await self.auth_handler.validate_login(
            login_submission, ratelimit=True
        )
        result = await self._complete_login(
            canonical_user_id, login_submission, callback
        )
        return result

    async def _complete_login(
        self,
        user_id: str,
        login_submission: JsonDict,
        callback: Optional[Callable[[Dict[str, str]], Awaitable[None]]] = None,
        create_non_existent_users: bool = False,
        ratelimit: bool = True,
    ) -> Dict[str, str]:
        """Called when we've successfully authed the user and now need to
        actually login them in (e.g. create devices). This gets called on
        all successful logins.

        Applies the ratelimiting for successful login attempts against an
        account.

        Args:
            user_id: ID of the user to register.
            login_submission: Dictionary of login information.
            callback: Callback function to run after login.
            create_non_existent_users: Whether to create the user if they don't
                exist. Defaults to False.
            ratelimit: Whether to ratelimit the login request.

        Returns:
            result: Dictionary of account information after successful login.
        """

        # Before we actually log them in we check if they've already logged in
        # too often. This happens here rather than before as we don't
        # necessarily know the user before now.
        if ratelimit:
            self._account_ratelimiter.ratelimit(user_id.lower())

        if create_non_existent_users:
            canonical_uid = await self.auth_handler.check_user_exists(user_id)
            if not canonical_uid:
                canonical_uid = await self.registration_handler.register_user(
                    localpart=UserID.from_string(user_id).localpart
                )
            user_id = canonical_uid

        device_id = login_submission.get("device_id")
        initial_display_name = login_submission.get("initial_device_display_name")
        device_id, access_token = await self.registration_handler.register_device(
            user_id, device_id, initial_display_name
        )

        result = {
            "user_id": user_id,
            "access_token": access_token,
            "home_server": self.hs.hostname,
            "device_id": device_id,
        }

        if callback is not None:
            await callback(result)

        return result

    async def _do_token_login(self, login_submission: JsonDict) -> Dict[str, str]:
        """
        Handle the final stage of SSO login.

        Args:
             login_submission: The JSON request body.

        Returns:
            The body of the JSON response.
        """
        token = login_submission["token"]
        auth_handler = self.auth_handler
        user_id = await auth_handler.validate_short_term_login_token_and_get_user_id(
            token
        )

        return await self._complete_login(
            user_id, login_submission, self.auth_handler._sso_login_callback
        )

    async def _do_jwt_login(self, login_submission: JsonDict) -> Dict[str, str]:
        token = login_submission.get("token", None)
        if token is None:
            raise LoginError(
                403, "Token field for JWT is missing", errcode=Codes.FORBIDDEN
            )

        import jwt

        try:
            payload = jwt.decode(
                token,
                self.jwt_secret,
                algorithms=[self.jwt_algorithm],
                issuer=self.jwt_issuer,
                audience=self.jwt_audiences,
            )
        except jwt.PyJWTError as e:
            # A JWT error occurred, return some info back to the client.
            raise LoginError(
                403,
                "JWT validation failed: %s" % (str(e),),
                errcode=Codes.FORBIDDEN,
            )

        user = payload.get("sub", None)
        if user is None:
            raise LoginError(403, "Invalid JWT", errcode=Codes.FORBIDDEN)

        user_id = UserID(user, self.hs.hostname).to_string()
        result = await self._complete_login(
            user_id, login_submission, create_non_existent_users=True
        )
        return result


def _get_auth_flow_dict_for_idp(idp: SsoIdentityProvider) -> JsonDict:
    """Return an entry for the login flow dict

    Returns an entry suitable for inclusion in "identity_providers" in the
    response to GET /_matrix/client/r0/login
    """
    e = {"id": idp.idp_id, "name": idp.idp_name}  # type: JsonDict
    if idp.idp_icon:
        e["icon"] = idp.idp_icon
    if idp.idp_brand:
        e["brand"] = idp.idp_brand
    return e


class SsoRedirectServlet(RestServlet):
    PATTERNS = client_patterns("/login/(cas|sso)/redirect$", v1=True)

    def __init__(self, hs: "HomeServer"):
        # make sure that the relevant handlers are instantiated, so that they
        # register themselves with the main SSOHandler.
        if hs.config.cas_enabled:
            hs.get_cas_handler()
        if hs.config.saml2_enabled:
            hs.get_saml_handler()
        if hs.config.oidc_enabled:
            hs.get_oidc_handler()
        self._sso_handler = hs.get_sso_handler()
        self._msc2858_enabled = hs.config.experimental.msc2858_enabled
        self._public_baseurl = hs.config.public_baseurl

    def register(self, http_server: HttpServer) -> None:
        super().register(http_server)
        if self._msc2858_enabled:
            # expose additional endpoint for MSC2858 support
            http_server.register_paths(
                "GET",
                client_patterns(
                    "/org.matrix.msc2858/login/sso/redirect/(?P<idp_id>[A-Za-z0-9_.~-]+)$",
                    releases=(),
                    unstable=True,
                ),
                self.on_GET,
                self.__class__.__name__,
            )

    async def on_GET(
        self, request: SynapseRequest, idp_id: Optional[str] = None
    ) -> None:
        if not self._public_baseurl:
            raise SynapseError(400, "SSO requires a valid public_baseurl")

        # if this isn't the expected hostname, redirect to the right one, so that we
        # get our cookies back.
        requested_uri = get_request_uri(request)
        baseurl_bytes = self._public_baseurl.encode("utf-8")
        if not requested_uri.startswith(baseurl_bytes):
            # swap out the incorrect base URL for the right one.
            #
            # The idea here is to redirect from
            #    https://foo.bar/whatever/_matrix/...
            # to
            #    https://public.baseurl/_matrix/...
            #
            i = requested_uri.index(b"/_matrix")
            new_uri = baseurl_bytes[:-1] + requested_uri[i:]
            logger.info(
                "Requested URI %s is not canonical: redirecting to %s",
                requested_uri.decode("utf-8", errors="replace"),
                new_uri.decode("utf-8", errors="replace"),
            )
            request.redirect(new_uri)
            finish_request(request)
            return

        client_redirect_url = parse_string(
            request, "redirectUrl", required=True, encoding=None
        )
        sso_url = await self._sso_handler.handle_redirect_request(
            request,
            client_redirect_url,
            idp_id,
        )
        logger.info("Redirecting to %s", sso_url)
        request.redirect(sso_url)
        finish_request(request)


class CasTicketServlet(RestServlet):
    PATTERNS = client_patterns("/login/cas/ticket", v1=True)

    def __init__(self, hs):
        super().__init__()
        self._cas_handler = hs.get_cas_handler()

    async def on_GET(self, request: SynapseRequest) -> None:
        client_redirect_url = parse_string(request, "redirectUrl")
        ticket = parse_string(request, "ticket", required=True)

        # Maybe get a session ID (if this ticket is from user interactive
        # authentication).
        session = parse_string(request, "session")

        # Either client_redirect_url or session must be provided.
        if not client_redirect_url and not session:
            message = "Missing string query parameter redirectUrl or session"
            raise SynapseError(400, message, errcode=Codes.MISSING_PARAM)

        await self._cas_handler.handle_ticket(
            request, ticket, client_redirect_url, session
        )


def register_servlets(hs, http_server):
    LoginRestServlet(hs).register(http_server)
    SsoRedirectServlet(hs).register(http_server)
    if hs.config.cas_enabled:
        CasTicketServlet(hs).register(http_server)