summary refs log tree commit diff
path: root/synapse/federation/transport/server/__init__.py
blob: 43102567db805c5670f1612333939ca9835ff3eb (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
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright 2020 Sorunome
# Copyright 2014-2021 The Matrix.org Foundation C.I.C.
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
import logging
from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Tuple, Type

from typing_extensions import Literal

from synapse.api.errors import FederationDeniedError, SynapseError
from synapse.federation.transport.server._base import (
    Authenticator,
    BaseFederationServlet,
)
from synapse.federation.transport.server.federation import (
    FEDERATION_SERVLET_CLASSES,
    FederationAccountStatusServlet,
    FederationMediaDownloadServlet,
    FederationMediaThumbnailServlet,
    FederationUnstableClientKeysClaimServlet,
)
from synapse.http.server import HttpServer, JsonResource
from synapse.http.servlet import (
    parse_boolean_from_args,
    parse_integer_from_args,
    parse_string_from_args,
)
from synapse.types import JsonDict, ThirdPartyInstanceID
from synapse.util.ratelimitutils import FederationRateLimiter

if TYPE_CHECKING:
    from synapse.server import HomeServer

logger = logging.getLogger(__name__)


class TransportLayerServer(JsonResource):
    """Handles incoming federation HTTP requests"""

    def __init__(self, hs: "HomeServer", servlet_groups: Optional[List[str]] = None):
        """Initialize the TransportLayerServer

        Will by default register all servlets. For custom behaviour, pass in
        a list of servlet_groups to register.

        Args:
            hs: homeserver
            servlet_groups: List of servlet groups to register.
                Defaults to ``DEFAULT_SERVLET_GROUPS``.
        """
        self.hs = hs
        self.clock = hs.get_clock()
        self.servlet_groups = servlet_groups

        super().__init__(hs, canonical_json=False)

        self.authenticator = Authenticator(hs)
        self.ratelimiter = hs.get_federation_ratelimiter()

        self.register_servlets()

    def register_servlets(self) -> None:
        register_servlets(
            self.hs,
            resource=self,
            ratelimiter=self.ratelimiter,
            authenticator=self.authenticator,
            servlet_groups=self.servlet_groups,
        )


class PublicRoomList(BaseFederationServlet):
    """
    Fetch the public room list for this server.

    This API returns information in the same format as /publicRooms on the
    client API, but will only ever include local public rooms and hence is
    intended for consumption by other homeservers.

    GET /publicRooms HTTP/1.1

    HTTP/1.1 200 OK
    Content-Type: application/json

    {
        "chunk": [
            {
                "aliases": [
                    "#test:localhost"
                ],
                "guest_can_join": false,
                "name": "test room",
                "num_joined_members": 3,
                "room_id": "!whkydVegtvatLfXmPN:localhost",
                "world_readable": false
            }
        ],
        "end": "END",
        "start": "START"
    }
    """

    PATH = "/publicRooms"
    CATEGORY = "Federation requests"

    def __init__(
        self,
        hs: "HomeServer",
        authenticator: Authenticator,
        ratelimiter: FederationRateLimiter,
        server_name: str,
    ):
        super().__init__(hs, authenticator, ratelimiter, server_name)
        self.handler = hs.get_room_list_handler()
        self.allow_access = hs.config.server.allow_public_rooms_over_federation

    async def on_GET(
        self, origin: str, content: Literal[None], query: Dict[bytes, List[bytes]]
    ) -> Tuple[int, JsonDict]:
        if not self.allow_access:
            raise FederationDeniedError(origin)

        limit = parse_integer_from_args(query, "limit", 0)
        since_token = parse_string_from_args(query, "since", None)
        include_all_networks = parse_boolean_from_args(
            query, "include_all_networks", default=False
        )
        third_party_instance_id = parse_string_from_args(
            query, "third_party_instance_id", None
        )

        if include_all_networks:
            network_tuple = None
        elif third_party_instance_id:
            network_tuple = ThirdPartyInstanceID.from_string(third_party_instance_id)
        else:
            network_tuple = ThirdPartyInstanceID(None, None)

        if limit == 0:
            # zero is a special value which corresponds to no limit.
            limit = None

        data = await self.handler.get_local_public_room_list(
            limit,
            since_token,
            network_tuple=network_tuple,
            from_federation_origin=origin,
        )
        return 200, data

    async def on_POST(
        self, origin: str, content: JsonDict, query: Dict[bytes, List[bytes]]
    ) -> Tuple[int, JsonDict]:
        # This implements MSC2197 (Search Filtering over Federation)
        if not self.allow_access:
            raise FederationDeniedError(origin)

        limit: Optional[int] = int(content.get("limit", 100))
        since_token = content.get("since", None)
        search_filter = content.get("filter", None)

        include_all_networks = content.get("include_all_networks", False)
        third_party_instance_id = content.get("third_party_instance_id", None)

        if include_all_networks:
            network_tuple = None
            if third_party_instance_id is not None:
                raise SynapseError(
                    400, "Can't use include_all_networks with an explicit network"
                )
        elif third_party_instance_id is None:
            network_tuple = ThirdPartyInstanceID(None, None)
        else:
            network_tuple = ThirdPartyInstanceID.from_string(third_party_instance_id)

        if search_filter is None:
            logger.warning("Nonefilter")

        if limit == 0:
            # zero is a special value which corresponds to no limit.
            limit = None

        data = await self.handler.get_local_public_room_list(
            limit=limit,
            since_token=since_token,
            search_filter=search_filter,
            network_tuple=network_tuple,
            from_federation_origin=origin,
        )

        return 200, data


class OpenIdUserInfo(BaseFederationServlet):
    """
    Exchange a bearer token for information about a user.

    The response format should be compatible with:
        http://openid.net/specs/openid-connect-core-1_0.html#UserInfoResponse

    GET /openid/userinfo?access_token=ABDEFGH HTTP/1.1

    HTTP/1.1 200 OK
    Content-Type: application/json

    {
        "sub": "@userpart:example.org",
    }
    """

    PATH = "/openid/userinfo"
    CATEGORY = "Federation requests"

    REQUIRE_AUTH = False

    def __init__(
        self,
        hs: "HomeServer",
        authenticator: Authenticator,
        ratelimiter: FederationRateLimiter,
        server_name: str,
    ):
        super().__init__(hs, authenticator, ratelimiter, server_name)
        self.handler = hs.get_federation_server()

    async def on_GET(
        self,
        origin: Optional[str],
        content: Literal[None],
        query: Dict[bytes, List[bytes]],
    ) -> Tuple[int, JsonDict]:
        token = parse_string_from_args(query, "access_token")
        if token is None:
            return (
                401,
                {"errcode": "M_MISSING_TOKEN", "error": "Access Token required"},
            )

        user_id = await self.handler.on_openid_userinfo(token)

        if user_id is None:
            return (
                401,
                {
                    "errcode": "M_UNKNOWN_TOKEN",
                    "error": "Access Token unknown or expired",
                },
            )

        return 200, {"sub": user_id}


SERVLET_GROUPS: Dict[str, Iterable[Type[BaseFederationServlet]]] = {
    "federation": FEDERATION_SERVLET_CLASSES,
    "room_list": (PublicRoomList,),
    "openid": (OpenIdUserInfo,),
    "media": (
        FederationMediaDownloadServlet,
        FederationMediaThumbnailServlet,
    ),
}


def register_servlets(
    hs: "HomeServer",
    resource: HttpServer,
    authenticator: Authenticator,
    ratelimiter: FederationRateLimiter,
    servlet_groups: Optional[Iterable[str]] = None,
) -> None:
    """Initialize and register servlet classes.

    Will by default register all servlets. For custom behaviour, pass in
    a list of servlet_groups to register.

    Args:
        hs: homeserver
        resource: resource class to register to
        authenticator: authenticator to use
        ratelimiter: ratelimiter to use
        servlet_groups: List of servlet groups to register.
            Defaults to ``DEFAULT_SERVLET_GROUPS``.
    """
    if not servlet_groups:
        servlet_groups = SERVLET_GROUPS.keys()

    for servlet_group in servlet_groups:
        # Skip unknown servlet groups.
        if servlet_group not in SERVLET_GROUPS:
            raise RuntimeError(
                f"Attempting to register unknown federation servlet: '{servlet_group}'"
            )

        for servletclass in SERVLET_GROUPS[servlet_group]:
            # Only allow the `/account_status` servlet if msc3720 is enabled
            if (
                servletclass == FederationAccountStatusServlet
                and not hs.config.experimental.msc3720_enabled
            ):
                continue
            if (
                servletclass == FederationUnstableClientKeysClaimServlet
                and not hs.config.experimental.msc3983_appservice_otk_claims
            ):
                continue

            if (
                servletclass == FederationMediaDownloadServlet
                or servletclass == FederationMediaThumbnailServlet
            ):
                if not hs.config.media.can_load_media_repo:
                    continue

            servletclass(
                hs=hs,
                authenticator=authenticator,
                ratelimiter=ratelimiter,
                server_name=hs.hostname,
            ).register(resource)