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Experimental Unix socket support (#15353)

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* Add IReactorUNIX to ISynapseReactor type hint.

* Create listen_unix().

Two options, 'path' to the file and 'mode' of permissions(not umask, recommend 666 as default as
nginx/other reverse proxies write to it and it's setup as user www-data)

For the moment, leave the option to always create a PID lockfile turned on by default

* Create UnixListenerConfig and wire it up.

Rename ListenerConfig to TCPListenerConfig, then Union them together into ListenerConfig.
This spidered around a bit, but I think I got it all. Metrics and manhole have been placed
behind a conditional in case of accidental putting them onto a unix socket.

Use new helpers to get if a listener is configured for TLS, and to help create a site tag
for logging.

There are 2 TODO things in parse_listener_def() to finish up at a later point.

* Refactor SynapseRequest to handle logging correctly when using a unix socket.

This prevents an exception when an IP address can not be retrieved for a request.

* Make the 'Synapse now listening on Unix socket' log line a little prettier.

* No silent failures on generic workers when trying to use a unix socket with metrics or manhole.

* Inline variables in app/_base.py

* Update docstring for listen_unix() to remove reference to a hardcoded permission of 0o666 and add a few comments saying where the default IS declared.

* Disallow both a unix socket and a ip/port combo on the same listener resource

* Linting

* Changelog

* review: simplify how listen_unix returns(and get rid of a type: ignore)

* review: fix typo from ConfigError in app/homeserver.py

* review: roll conditional for http_options.tag into get_site_tag() helper(and add docstring)

* review: enhance the conditionals for checking if a port or path is valid, remove a TODO line

* review: Try updating comment in get_client_ip_if_available to clarify what is being retrieved and why

* Pretty up how 'Synapse now listening on Unix Socket' looks by decoding the byte string.

* review: In parse_listener_def(), raise ConfigError if neither socket_path nor port is declared(and fix a typo)
This commit is contained in:
Jason Little 2023-04-03 04:27:51 -05:00 committed by GitHub
parent 9b2ab506c5
commit 56efa9b167
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GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 239 additions and 90 deletions
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1
changelog.d/15353.misc Normal file
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@ -0,0 +1 @@
Add experimental support for Unix sockets. Contributed by Jason Little.

92
synapse/app/_base.py
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@ -41,7 +41,12 @@ from typing_extensions import ParamSpec
import twisted
from twisted.internet import defer, error, reactor as _reactor
from twisted.internet.interfaces import IOpenSSLContextFactory, IReactorSSL, IReactorTCP
from twisted.internet.interfaces import (
IOpenSSLContextFactory,
IReactorSSL,
IReactorTCP,
IReactorUNIX,
)
from twisted.internet.protocol import ServerFactory
from twisted.internet.tcp import Port
from twisted.logger import LoggingFile, LogLevel
@ -56,7 +61,7 @@ from synapse.app.phone_stats_home import start_phone_stats_home
from synapse.config import ConfigError
from synapse.config._base import format_config_error
from synapse.config.homeserver import HomeServerConfig
from synapse.config.server import ListenerConfig, ManholeConfig
from synapse.config.server import ListenerConfig, ManholeConfig, TCPListenerConfig
from synapse.crypto import context_factory
from synapse.events.presence_router import load_legacy_presence_router
from synapse.events.spamcheck import load_legacy_spam_checkers
@ -351,6 +356,28 @@ def listen_tcp(
return r # type: ignore[return-value]
def listen_unix(
path: str,
mode: int,
factory: ServerFactory,
reactor: IReactorUNIX = reactor,
backlog: int = 50,
) -> List[Port]:
"""
Create a UNIX socket for a given path and 'mode' permission
Returns:
list of twisted.internet.tcp.Port listening for TCP connections
"""
wantPID = True
return [
# IReactorUNIX returns an object implementing IListeningPort from listenUNIX,
# but we know it will be a Port instance.
cast(Port, reactor.listenUNIX(path, factory, backlog, mode, wantPID))
]
def listen_http(
listener_config: ListenerConfig,
root_resource: Resource,
@ -359,18 +386,13 @@ def listen_http(
context_factory: Optional[IOpenSSLContextFactory],
reactor: ISynapseReactor = reactor,
) -> List[Port]:
port = listener_config.port
bind_addresses = listener_config.bind_addresses
tls = listener_config.tls
assert listener_config.http_options is not None
site_tag = listener_config.http_options.tag
if site_tag is None:
site_tag = str(port)
site_tag = listener_config.get_site_tag()
site = SynapseSite(
"synapse.access.%s.%s" % ("https" if tls else "http", site_tag),
"synapse.access.%s.%s"
% ("https" if listener_config.is_tls() else "http", site_tag),
site_tag,
listener_config,
root_resource,
@ -378,25 +400,41 @@ def listen_http(
max_request_body_size=max_request_body_size,
reactor=reactor,
)
if tls:
# refresh_certificate should have been called before this.
assert context_factory is not None
ports = listen_ssl(
bind_addresses,
port,
site,
context_factory,
reactor=reactor,
)
logger.info("Synapse now listening on TCP port %d (TLS)", port)
if isinstance(listener_config, TCPListenerConfig):
if listener_config.is_tls():
# refresh_certificate should have been called before this.
assert context_factory is not None
ports = listen_ssl(
listener_config.bind_addresses,
listener_config.port,
site,
context_factory,
reactor=reactor,
)
logger.info(
"Synapse now listening on TCP port %d (TLS)", listener_config.port
)
else:
ports = listen_tcp(
listener_config.bind_addresses,
listener_config.port,
site,
reactor=reactor,
)
logger.info("Synapse now listening on TCP port %d", listener_config.port)
else:
ports = listen_tcp(
bind_addresses,
port,
site,
reactor=reactor,
ports = listen_unix(
listener_config.path, listener_config.mode, site, reactor=reactor
)
logger.info("Synapse now listening on TCP port %d", port)
# getHost() returns a UNIXAddress which contains an instance variable of 'name'
# encoded as a byte string. Decode as utf-8 so pretty.
logger.info(
"Synapse now listening on Unix Socket at: "
f"{ports[0].getHost().name.decode('utf-8')}"
)
return ports

34
synapse/app/generic_worker.py
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@ -38,7 +38,7 @@ from synapse.app._base import (
from synapse.config._base import ConfigError
from synapse.config.homeserver import HomeServerConfig
from synapse.config.logger import setup_logging
from synapse.config.server import ListenerConfig
from synapse.config.server import ListenerConfig, TCPListenerConfig
from synapse.federation.transport.server import TransportLayerServer
from synapse.http.server import JsonResource, OptionsResource
from synapse.logging.context import LoggingContext
@ -236,12 +236,18 @@ class GenericWorkerServer(HomeServer):
if listener.type == "http":
self._listen_http(listener)
elif listener.type == "manhole":
_base.listen_manhole(
listener.bind_addresses,
listener.port,
manhole_settings=self.config.server.manhole_settings,
manhole_globals={"hs": self},
)
if isinstance(listener, TCPListenerConfig):
_base.listen_manhole(
listener.bind_addresses,
listener.port,
manhole_settings=self.config.server.manhole_settings,
manhole_globals={"hs": self},
)
else:
raise ConfigError(
"Can not using a unix socket for manhole at this time."
)
elif listener.type == "metrics":
if not self.config.metrics.enable_metrics:
logger.warning(
@ -249,10 +255,16 @@ class GenericWorkerServer(HomeServer):
"enable_metrics is not True!"
)
else:
_base.listen_metrics(
listener.bind_addresses,
listener.port,
)
if isinstance(listener, TCPListenerConfig):
_base.listen_metrics(
listener.bind_addresses,
listener.port,
)
else:
raise ConfigError(
"Can not use a unix socket for metrics at this time."
)
else:
logger.warning("Unsupported listener type: %s", listener.type)

42
synapse/app/homeserver.py
View File

@ -44,7 +44,7 @@ from synapse.app._base import (
)
from synapse.config._base import ConfigError, format_config_error
from synapse.config.homeserver import HomeServerConfig
from synapse.config.server import ListenerConfig
from synapse.config.server import ListenerConfig, TCPListenerConfig
from synapse.federation.transport.server import TransportLayerServer
from synapse.http.additional_resource import AdditionalResource
from synapse.http.server import (
@ -78,14 +78,13 @@ class SynapseHomeServer(HomeServer):
DATASTORE_CLASS = DataStore # type: ignore
def _listener_http(
self, config: HomeServerConfig, listener_config: ListenerConfig
self,
config: HomeServerConfig,
listener_config: ListenerConfig,
) -> Iterable[Port]:
port = listener_config.port
# Must exist since this is an HTTP listener.
assert listener_config.http_options is not None
site_tag = listener_config.http_options.tag
if site_tag is None:
site_tag = str(port)
site_tag = listener_config.get_site_tag()
# We always include a health resource.
resources: Dict[str, Resource] = {"/health": HealthResource()}
@ -252,12 +251,17 @@ class SynapseHomeServer(HomeServer):
self._listener_http(self.config, listener)
)
elif listener.type == "manhole":
_base.listen_manhole(
listener.bind_addresses,
listener.port,
manhole_settings=self.config.server.manhole_settings,
manhole_globals={"hs": self},
)
if isinstance(listener, TCPListenerConfig):
_base.listen_manhole(
listener.bind_addresses,
listener.port,
manhole_settings=self.config.server.manhole_settings,
manhole_globals={"hs": self},
)
else:
raise ConfigError(
"Can not use a unix socket for manhole at this time."
)
elif listener.type == "metrics":
if not self.config.metrics.enable_metrics:
logger.warning(
@ -265,10 +269,16 @@ class SynapseHomeServer(HomeServer):
"enable_metrics is not True!"
)
else:
_base.listen_metrics(
listener.bind_addresses,
listener.port,
)
if isinstance(listener, TCPListenerConfig):
_base.listen_metrics(
listener.bind_addresses,
listener.port,
)
else:
raise ConfigError(
"Can not use a unix socket for metrics at this time."
)
else:
# this shouldn't happen, as the listener type should have been checked
# during parsing

118
synapse/config/server.py
View File

@ -214,17 +214,52 @@ class HttpListenerConfig:
@attr.s(slots=True, frozen=True, auto_attribs=True)
class ListenerConfig:
"""Object describing the configuration of a single listener."""
class TCPListenerConfig:
"""Object describing the configuration of a single TCP listener."""
port: int = attr.ib(validator=attr.validators.instance_of(int))
bind_addresses: List[str]
bind_addresses: List[str] = attr.ib(validator=attr.validators.instance_of(List))
type: str = attr.ib(validator=attr.validators.in_(KNOWN_LISTENER_TYPES))
tls: bool = False
# http_options is only populated if type=http
http_options: Optional[HttpListenerConfig] = None
def get_site_tag(self) -> str:
"""Retrieves http_options.tag if it exists, otherwise the port number."""
if self.http_options and self.http_options.tag is not None:
return self.http_options.tag
else:
return str(self.port)
def is_tls(self) -> bool:
return self.tls
@attr.s(slots=True, frozen=True, auto_attribs=True)
class UnixListenerConfig:
"""Object describing the configuration of a single Unix socket listener."""
# Note: unix sockets can not be tls encrypted, so HAVE to be behind a tls-handling
# reverse proxy
path: str = attr.ib()
# A default(0o666) for this is set in parse_listener_def() below
mode: int
type: str = attr.ib(validator=attr.validators.in_(KNOWN_LISTENER_TYPES))
# http_options is only populated if type=http
http_options: Optional[HttpListenerConfig] = None
def get_site_tag(self) -> str:
return "unix"
def is_tls(self) -> bool:
"""Unix sockets can't have TLS"""
return False
ListenerConfig = Union[TCPListenerConfig, UnixListenerConfig]
@attr.s(slots=True, frozen=True, auto_attribs=True)
class ManholeConfig:
@ -531,12 +566,12 @@ class ServerConfig(Config):
self.listeners = [parse_listener_def(i, x) for i, x in enumerate(listeners)]
# no_tls is not really supported any more, but let's grandfather it in
# here.
# no_tls is not really supported anymore, but let's grandfather it in here.
if config.get("no_tls", False):
l2 = []
for listener in self.listeners:
if listener.tls:
if isinstance(listener, TCPListenerConfig) and listener.tls:
# Use isinstance() as the assertion this *has* a listener.port
logger.info(
"Ignoring TLS-enabled listener on port %i due to no_tls",
listener.port,
@ -577,7 +612,7 @@ class ServerConfig(Config):
)
self.listeners.append(
ListenerConfig(
TCPListenerConfig(
port=bind_port,
bind_addresses=[bind_host],
tls=True,
@ -589,7 +624,7 @@ class ServerConfig(Config):
unsecure_port = config.get("unsecure_port", bind_port - 400)
if unsecure_port:
self.listeners.append(
ListenerConfig(
TCPListenerConfig(
port=unsecure_port,
bind_addresses=[bind_host],
tls=False,
@ -601,7 +636,7 @@ class ServerConfig(Config):
manhole = config.get("manhole")
if manhole:
self.listeners.append(
ListenerConfig(
TCPListenerConfig(
port=manhole,
bind_addresses=["127.0.0.1"],
type="manhole",
@ -648,7 +683,7 @@ class ServerConfig(Config):
logger.warning(METRICS_PORT_WARNING)
self.listeners.append(
ListenerConfig(
TCPListenerConfig(
port=metrics_port,
bind_addresses=[config.get("metrics_bind_host", "127.0.0.1")],
type="http",
@ -724,7 +759,7 @@ class ServerConfig(Config):
self.delete_stale_devices_after = None
def has_tls_listener(self) -> bool:
return any(listener.tls for listener in self.listeners)
return any(listener.is_tls() for listener in self.listeners)
def generate_config_section(
self,
@ -904,25 +939,25 @@ def parse_listener_def(num: int, listener: Any) -> ListenerConfig:
raise ConfigError(DIRECT_TCP_ERROR, ("listeners", str(num), "type"))
port = listener.get("port")
if type(port) is not int:
socket_path = listener.get("path")
# Either a port or a path should be declared at a minimum. Using both would be bad.
if port is not None and not isinstance(port, int):
raise ConfigError("Listener configuration is lacking a valid 'port' option")
if socket_path is not None and not isinstance(socket_path, str):
raise ConfigError("Listener configuration is lacking a valid 'path' option")
if port and socket_path:
raise ConfigError(
"Can not have both a UNIX socket and an IP/port declared for the same "
"resource!"
)
if port is None and socket_path is None:
raise ConfigError(
"Must have either a UNIX socket or an IP/port declared for a given "
"resource!"
)
tls = listener.get("tls", False)
bind_addresses = listener.get("bind_addresses", [])
bind_address = listener.get("bind_address")
# if bind_address was specified, add it to the list of addresses
if bind_address:
bind_addresses.append(bind_address)
# if we still have an empty list of addresses, use the default list
if not bind_addresses:
if listener_type == "metrics":
# the metrics listener doesn't support IPv6
bind_addresses.append("0.0.0.0")
else:
bind_addresses.extend(DEFAULT_BIND_ADDRESSES)
http_config = None
if listener_type == "http":
try:
@ -932,8 +967,12 @@ def parse_listener_def(num: int, listener: Any) -> ListenerConfig:
except ValueError as e:
raise ConfigError("Unknown listener resource") from e
# For a unix socket, default x_forwarded to True, as this is the only way of
# getting a client IP.
# Note: a reverse proxy is required anyway, as there is no way of exposing a
# unix socket to the internet.
http_config = HttpListenerConfig(
x_forwarded=listener.get("x_forwarded", False),
x_forwarded=listener.get("x_forwarded", (True if socket_path else False)),
resources=resources,
additional_resources=listener.get("additional_resources", {}),
tag=listener.get("tag"),
@ -941,7 +980,30 @@ def parse_listener_def(num: int, listener: Any) -> ListenerConfig:
experimental_cors_msc3886=listener.get("experimental_cors_msc3886", False),
)
return ListenerConfig(port, bind_addresses, listener_type, tls, http_config)
if socket_path:
# TODO: Add in path validation, like if the directory exists and is writable?
# Set a default for the permission, in case it's left out
socket_mode = listener.get("mode", 0o666)
return UnixListenerConfig(socket_path, socket_mode, listener_type, http_config)
else:
assert port is not None
bind_addresses = listener.get("bind_addresses", [])
bind_address = listener.get("bind_address")
# if bind_address was specified, add it to the list of addresses
if bind_address:
bind_addresses.append(bind_address)
# if we still have an empty list of addresses, use the default list
if not bind_addresses:
if listener_type == "metrics":
# the metrics listener doesn't support IPv6
bind_addresses.append("0.0.0.0")
else:
bind_addresses.extend(DEFAULT_BIND_ADDRESSES)
return TCPListenerConfig(port, bind_addresses, listener_type, tls, http_config)
_MANHOLE_SETTINGS_SCHEMA = {

13
synapse/config/workers.py
View File

@ -19,15 +19,18 @@ from typing import Any, Dict, List, Union
import attr
from synapse.types import JsonDict
from ._base import (
from synapse.config._base import (
Config,
ConfigError,
RoutableShardedWorkerHandlingConfig,
ShardedWorkerHandlingConfig,
)
from .server import DIRECT_TCP_ERROR, ListenerConfig, parse_listener_def
from synapse.config.server import (
DIRECT_TCP_ERROR,
TCPListenerConfig,
parse_listener_def,
)
from synapse.types import JsonDict
_DEPRECATED_WORKER_DUTY_OPTION_USED = """
The '%s' configuration option is deprecated and will be removed in a future
@ -161,7 +164,7 @@ class WorkerConfig(Config):
manhole = config.get("worker_manhole")
if manhole:
self.worker_listeners.append(
ListenerConfig(
TCPListenerConfig(
port=manhole,
bind_addresses=["127.0.0.1"],
type="manhole",

27
synapse/http/site.py
View File

@ -19,6 +19,7 @@ from typing import TYPE_CHECKING, Any, Generator, Optional, Tuple, Union
import attr
from zope.interface import implementer
from twisted.internet.address import UNIXAddress
from twisted.internet.defer import Deferred
from twisted.internet.interfaces import IAddress, IReactorTime
from twisted.python.failure import Failure
@ -257,7 +258,7 @@ class SynapseRequest(Request):
request_id,
request=ContextRequest(
request_id=request_id,
ip_address=self.getClientAddress().host,
ip_address=self.get_client_ip_if_available(),
site_tag=self.synapse_site.site_tag,
# The requester is going to be unknown at this point.
requester=None,
@ -414,7 +415,7 @@ class SynapseRequest(Request):
self.synapse_site.access_logger.debug(
"%s - %s - Received request: %s %s",
self.getClientAddress().host,
self.get_client_ip_if_available(),
self.synapse_site.site_tag,
self.get_method(),
self.get_redacted_uri(),
@ -462,7 +463,7 @@ class SynapseRequest(Request):
"%s - %s - {%s}"
" Processed request: %.3fsec/%.3fsec (%.3fsec, %.3fsec) (%.3fsec/%.3fsec/%d)"
' %sB %s "%s %s %s" "%s" [%d dbevts]',
self.getClientAddress().host,
self.get_client_ip_if_available(),
self.synapse_site.site_tag,
requester,
processing_time,
@ -500,6 +501,26 @@ class SynapseRequest(Request):
return True
def get_client_ip_if_available(self) -> str:
"""Logging helper. Return something useful when a client IP is not retrievable
from a unix socket.
In practice, this returns the socket file path on a SynapseRequest if using a
unix socket and the normal IP address for TCP sockets.
"""
# getClientAddress().host returns a proper IP address for a TCP socket. But
# unix sockets have no concept of IP addresses or ports and return a
# UNIXAddress containing a 'None' value. In order to get something usable for
# logs(where this is used) get the unix socket file. getHost() returns a
# UNIXAddress containing a value of the socket file and has an instance
# variable of 'name' encoded as a byte string containing the path we want.
# Decode to utf-8 so it looks nice.
if isinstance(self.getClientAddress(), UNIXAddress):
return self.getHost().name.decode("utf-8")
else:
return self.getClientAddress().host
class XForwardedForRequest(SynapseRequest):
"""Request object which honours proxy headers

2
synapse/types/__init__.py
View File

@ -50,6 +50,7 @@ from twisted.internet.interfaces import (
IReactorTCP,
IReactorThreads,
IReactorTime,
IReactorUNIX,
)
from synapse.api.errors import Codes, SynapseError
@ -91,6 +92,7 @@ StrCollection = Union[Tuple[str, ...], List[str], AbstractSet[str]]
class ISynapseReactor(
IReactorTCP,
IReactorSSL,
IReactorUNIX,
IReactorPluggableNameResolver,
IReactorTime,
IReactorCore,