mirror of
https://mau.dev/maunium/synapse.git
synced 2024-09-06 01:22:16 +00:00
289 lines
9.9 KiB
Python
289 lines
9.9 KiB
Python
#
|
|
# This file is licensed under the Affero General Public License (AGPL) version 3.
|
|
#
|
|
# 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 json
|
|
import logging
|
|
import urllib.parse
|
|
from typing import TYPE_CHECKING, Any, Optional, Set, Tuple, cast
|
|
|
|
from twisted.internet import protocol
|
|
from twisted.internet.interfaces import ITCPTransport
|
|
from twisted.internet.protocol import connectionDone
|
|
from twisted.python import failure
|
|
from twisted.python.failure import Failure
|
|
from twisted.web.client import ResponseDone
|
|
from twisted.web.http_headers import Headers
|
|
from twisted.web.iweb import IResponse
|
|
from twisted.web.resource import IResource
|
|
from twisted.web.server import Request, Site
|
|
|
|
from synapse.api.errors import Codes, InvalidProxyCredentialsError
|
|
from synapse.http import QuieterFileBodyProducer
|
|
from synapse.http.server import _AsyncResource
|
|
from synapse.logging.context import make_deferred_yieldable, run_in_background
|
|
from synapse.types import ISynapseReactor
|
|
from synapse.util.async_helpers import timeout_deferred
|
|
|
|
if TYPE_CHECKING:
|
|
from synapse.http.site import SynapseRequest
|
|
from synapse.server import HomeServer
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
# "Hop-by-hop" headers (as opposed to "end-to-end" headers) as defined by RFC2616
|
|
# section 13.5.1 and referenced in RFC9110 section 7.6.1. These are meant to only be
|
|
# consumed by the immediate recipient and not be forwarded on.
|
|
HOP_BY_HOP_HEADERS = {
|
|
"Connection",
|
|
"Keep-Alive",
|
|
"Proxy-Authenticate",
|
|
"Proxy-Authorization",
|
|
"TE",
|
|
"Trailers",
|
|
"Transfer-Encoding",
|
|
"Upgrade",
|
|
}
|
|
|
|
|
|
def parse_connection_header_value(
|
|
connection_header_value: Optional[bytes],
|
|
) -> Set[str]:
|
|
"""
|
|
Parse the `Connection` header to determine which headers we should not be copied
|
|
over from the remote response.
|
|
|
|
As defined by RFC2616 section 14.10 and RFC9110 section 7.6.1
|
|
|
|
Example: `Connection: close, X-Foo, X-Bar` will return `{"Close", "X-Foo", "X-Bar"}`
|
|
|
|
Even though "close" is a special directive, let's just treat it as just another
|
|
header for simplicity. If people want to check for this directive, they can simply
|
|
check for `"Close" in headers`.
|
|
|
|
Args:
|
|
connection_header_value: The value of the `Connection` header.
|
|
|
|
Returns:
|
|
The set of header names that should not be copied over from the remote response.
|
|
The keys are capitalized in canonical capitalization.
|
|
"""
|
|
headers = Headers()
|
|
extra_headers_to_remove: Set[str] = set()
|
|
if connection_header_value:
|
|
extra_headers_to_remove = {
|
|
headers._canonicalNameCaps(connection_option.strip()).decode("ascii")
|
|
for connection_option in connection_header_value.split(b",")
|
|
}
|
|
|
|
return extra_headers_to_remove
|
|
|
|
|
|
class ProxyResource(_AsyncResource):
|
|
"""
|
|
A stub resource that proxies any requests with a `matrix-federation://` scheme
|
|
through the given `federation_agent` to the remote homeserver and ferries back the
|
|
info.
|
|
"""
|
|
|
|
isLeaf = True
|
|
|
|
def __init__(self, reactor: ISynapseReactor, hs: "HomeServer"):
|
|
super().__init__(True)
|
|
|
|
self.reactor = reactor
|
|
self.agent = hs.get_federation_http_client().agent
|
|
|
|
self._proxy_authorization_secret = hs.config.worker.worker_replication_secret
|
|
|
|
def _check_auth(self, request: Request) -> None:
|
|
# The `matrix-federation://` proxy functionality can only be used with auth.
|
|
# Protect homserver admins forgetting to configure a secret.
|
|
assert self._proxy_authorization_secret is not None
|
|
|
|
# Get the authorization header.
|
|
auth_headers = request.requestHeaders.getRawHeaders(b"Proxy-Authorization")
|
|
|
|
if not auth_headers:
|
|
raise InvalidProxyCredentialsError(
|
|
"Missing Proxy-Authorization header.", Codes.MISSING_TOKEN
|
|
)
|
|
if len(auth_headers) > 1:
|
|
raise InvalidProxyCredentialsError(
|
|
"Too many Proxy-Authorization headers.", Codes.UNAUTHORIZED
|
|
)
|
|
parts = auth_headers[0].split(b" ")
|
|
if parts[0] == b"Bearer" and len(parts) == 2:
|
|
received_secret = parts[1].decode("ascii")
|
|
if self._proxy_authorization_secret == received_secret:
|
|
# Success!
|
|
return
|
|
|
|
raise InvalidProxyCredentialsError(
|
|
"Invalid Proxy-Authorization header.", Codes.UNAUTHORIZED
|
|
)
|
|
|
|
async def _async_render(self, request: "SynapseRequest") -> Tuple[int, Any]:
|
|
uri = urllib.parse.urlparse(request.uri)
|
|
assert uri.scheme == b"matrix-federation"
|
|
|
|
# Check the authorization headers before handling the request.
|
|
self._check_auth(request)
|
|
|
|
headers = Headers()
|
|
for header_name in (b"User-Agent", b"Authorization", b"Content-Type"):
|
|
header_value = request.getHeader(header_name)
|
|
if header_value:
|
|
headers.addRawHeader(header_name, header_value)
|
|
|
|
request_deferred = run_in_background(
|
|
self.agent.request,
|
|
request.method,
|
|
request.uri,
|
|
headers=headers,
|
|
bodyProducer=QuieterFileBodyProducer(request.content),
|
|
)
|
|
request_deferred = timeout_deferred(
|
|
request_deferred,
|
|
# This should be set longer than the timeout in `MatrixFederationHttpClient`
|
|
# so that it has enough time to complete and pass us the data before we give
|
|
# up.
|
|
timeout=90,
|
|
reactor=self.reactor,
|
|
)
|
|
|
|
response = await make_deferred_yieldable(request_deferred)
|
|
|
|
return response.code, response
|
|
|
|
def _send_response(
|
|
self,
|
|
request: "SynapseRequest",
|
|
code: int,
|
|
response_object: Any,
|
|
) -> None:
|
|
response = cast(IResponse, response_object)
|
|
response_headers = cast(Headers, response.headers)
|
|
|
|
request.setResponseCode(code)
|
|
|
|
# The `Connection` header also defines which headers should not be copied over.
|
|
connection_header = response_headers.getRawHeaders(b"connection")
|
|
extra_headers_to_remove = parse_connection_header_value(
|
|
connection_header[0] if connection_header else None
|
|
)
|
|
|
|
# Copy headers.
|
|
for k, v in response_headers.getAllRawHeaders():
|
|
# Do not copy over any hop-by-hop headers. These are meant to only be
|
|
# consumed by the immediate recipient and not be forwarded on.
|
|
header_key = k.decode("ascii")
|
|
if (
|
|
header_key in HOP_BY_HOP_HEADERS
|
|
or header_key in extra_headers_to_remove
|
|
):
|
|
continue
|
|
|
|
request.responseHeaders.setRawHeaders(k, v)
|
|
|
|
response.deliverBody(_ProxyResponseBody(request))
|
|
|
|
def _send_error_response(
|
|
self,
|
|
f: failure.Failure,
|
|
request: "SynapseRequest",
|
|
) -> None:
|
|
if isinstance(f.value, InvalidProxyCredentialsError):
|
|
error_response_code = f.value.code
|
|
error_response_json = {"errcode": f.value.errcode, "err": f.value.msg}
|
|
else:
|
|
error_response_code = 502
|
|
error_response_json = {
|
|
"errcode": Codes.UNKNOWN,
|
|
"err": "ProxyResource: Error when proxying request: %s %s -> %s"
|
|
% (
|
|
request.method.decode("ascii"),
|
|
request.uri.decode("ascii"),
|
|
f,
|
|
),
|
|
}
|
|
|
|
request.setResponseCode(error_response_code)
|
|
request.setHeader(b"Content-Type", b"application/json")
|
|
request.write((json.dumps(error_response_json)).encode())
|
|
request.finish()
|
|
|
|
|
|
class _ProxyResponseBody(protocol.Protocol):
|
|
"""
|
|
A protocol that proxies the given remote response data back out to the given local
|
|
request.
|
|
"""
|
|
|
|
transport: Optional[ITCPTransport] = None
|
|
|
|
def __init__(self, request: "SynapseRequest") -> None:
|
|
self._request = request
|
|
|
|
def dataReceived(self, data: bytes) -> None:
|
|
# Avoid sending response data to the local request that already disconnected
|
|
if self._request._disconnected and self.transport is not None:
|
|
# Close the connection (forcefully) since all the data will get
|
|
# discarded anyway.
|
|
self.transport.abortConnection()
|
|
return
|
|
|
|
self._request.write(data)
|
|
|
|
def connectionLost(self, reason: Failure = connectionDone) -> None:
|
|
# If the local request is already finished (successfully or failed), don't
|
|
# worry about sending anything back.
|
|
if self._request.finished:
|
|
return
|
|
|
|
if reason.check(ResponseDone):
|
|
self._request.finish()
|
|
else:
|
|
# Abort the underlying request since our remote request also failed.
|
|
self._request.transport.abortConnection()
|
|
|
|
|
|
class ProxySite(Site):
|
|
"""
|
|
Proxies any requests with a `matrix-federation://` scheme through the given
|
|
`federation_agent`. Otherwise, behaves like a normal `Site`.
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
resource: IResource,
|
|
reactor: ISynapseReactor,
|
|
hs: "HomeServer",
|
|
):
|
|
super().__init__(resource, reactor=reactor)
|
|
|
|
self._proxy_resource = ProxyResource(reactor, hs=hs)
|
|
|
|
def getResourceFor(self, request: "SynapseRequest") -> IResource:
|
|
uri = urllib.parse.urlparse(request.uri)
|
|
if uri.scheme == b"matrix-federation":
|
|
return self._proxy_resource
|
|
|
|
return super().getResourceFor(request)
|