MatrixSynapse/synapse/config/experimental.py

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# Copyright 2021 The Matrix.org Foundation C.I.C.
#
# 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 enum
from typing import TYPE_CHECKING, Any, Optional
import attr
import attr.validators
from synapse.api.errors import LimitExceededError
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersions
from synapse.config import ConfigError
from synapse.config._base import Config, RootConfig
from synapse.types import JsonDict
# Determine whether authlib is installed.
try:
import authlib # noqa: F401
HAS_AUTHLIB = True
except ImportError:
HAS_AUTHLIB = False
if TYPE_CHECKING:
# Only import this if we're type checking, as it might not be installed at runtime.
from authlib.jose.rfc7517 import JsonWebKey
class ClientAuthMethod(enum.Enum):
"""List of supported client auth methods."""
CLIENT_SECRET_POST = "client_secret_post"
CLIENT_SECRET_BASIC = "client_secret_basic"
CLIENT_SECRET_JWT = "client_secret_jwt"
PRIVATE_KEY_JWT = "private_key_jwt"
def _parse_jwks(jwks: Optional[JsonDict]) -> Optional["JsonWebKey"]:
"""A helper function to parse a JWK dict into a JsonWebKey."""
if jwks is None:
return None
from authlib.jose.rfc7517 import JsonWebKey
return JsonWebKey.import_key(jwks)
@attr.s(slots=True, frozen=True)
class MSC3861:
"""Configuration for MSC3861: Matrix architecture change to delegate authentication via OIDC"""
enabled: bool = attr.ib(default=False, validator=attr.validators.instance_of(bool))
"""Whether to enable MSC3861 auth delegation."""
@enabled.validator
def _check_enabled(self, attribute: attr.Attribute, value: bool) -> None:
# Only allow enabling MSC3861 if authlib is installed
if value and not HAS_AUTHLIB:
raise ConfigError(
"MSC3861 is enabled but authlib is not installed. "
"Please install authlib to use MSC3861.",
("experimental", "msc3861", "enabled"),
)
issuer: str = attr.ib(default="", validator=attr.validators.instance_of(str))
"""The URL of the OIDC Provider."""
issuer_metadata: Optional[JsonDict] = attr.ib(default=None)
"""The issuer metadata to use, otherwise discovered from /.well-known/openid-configuration as per MSC2965."""
client_id: str = attr.ib(
default="",
validator=attr.validators.instance_of(str),
)
"""The client ID to use when calling the introspection endpoint."""
client_auth_method: ClientAuthMethod = attr.ib(
default=ClientAuthMethod.CLIENT_SECRET_POST, converter=ClientAuthMethod
)
"""The auth method used when calling the introspection endpoint."""
client_secret: Optional[str] = attr.ib(
default=None,
validator=attr.validators.optional(attr.validators.instance_of(str)),
)
"""
The client secret to use when calling the introspection endpoint,
when using any of the client_secret_* client auth methods.
"""
jwk: Optional["JsonWebKey"] = attr.ib(default=None, converter=_parse_jwks)
"""
The JWKS to use when calling the introspection endpoint,
when using the private_key_jwt client auth method.
"""
@client_auth_method.validator
def _check_client_auth_method(
self, attribute: attr.Attribute, value: ClientAuthMethod
) -> None:
# Check that the right client credentials are provided for the client auth method.
if not self.enabled:
return
if value == ClientAuthMethod.PRIVATE_KEY_JWT and self.jwk is None:
raise ConfigError(
"A JWKS must be provided when using the private_key_jwt client auth method",
("experimental", "msc3861", "client_auth_method"),
)
if (
value
in (
ClientAuthMethod.CLIENT_SECRET_POST,
ClientAuthMethod.CLIENT_SECRET_BASIC,
ClientAuthMethod.CLIENT_SECRET_JWT,
)
and self.client_secret is None
):
raise ConfigError(
f"A client secret must be provided when using the {value} client auth method",
("experimental", "msc3861", "client_auth_method"),
)
account_management_url: Optional[str] = attr.ib(
default=None,
validator=attr.validators.optional(attr.validators.instance_of(str)),
)
"""The URL of the My Account page on the OIDC Provider as per MSC2965."""
admin_token: Optional[str] = attr.ib(
default=None,
validator=attr.validators.optional(attr.validators.instance_of(str)),
)
"""
A token that should be considered as an admin token.
This is used by the OIDC provider, to make admin calls to Synapse.
"""
def check_config_conflicts(self, root: RootConfig) -> None:
"""Checks for any configuration conflicts with other parts of Synapse.
Raises:
ConfigError: If there are any configuration conflicts.
"""
if not self.enabled:
return
if (
root.auth.password_enabled_for_reauth
or root.auth.password_enabled_for_login
):
raise ConfigError(
"Password auth cannot be enabled when OAuth delegation is enabled",
("password_config", "enabled"),
)
if root.registration.enable_registration:
raise ConfigError(
"Registration cannot be enabled when OAuth delegation is enabled",
("enable_registration",),
)
# We only need to test the user consent version, as if it must be set if the user_consent section was present in the config
if root.consent.user_consent_version is not None:
raise ConfigError(
"User consent cannot be enabled when OAuth delegation is enabled",
("user_consent",),
)
if (
root.oidc.oidc_enabled
or root.saml2.saml2_enabled
or root.cas.cas_enabled
or root.jwt.jwt_enabled
):
raise ConfigError("SSO cannot be enabled when OAuth delegation is enabled")
if bool(root.authproviders.password_providers):
raise ConfigError(
"Password auth providers cannot be enabled when OAuth delegation is enabled"
)
if root.captcha.enable_registration_captcha:
raise ConfigError(
"CAPTCHA cannot be enabled when OAuth delegation is enabled",
("captcha", "enable_registration_captcha"),
)
if root.auth.login_via_existing_enabled:
raise ConfigError(
"Login via existing session cannot be enabled when OAuth delegation is enabled",
("login_via_existing_session", "enabled"),
)
if root.registration.refresh_token_lifetime:
raise ConfigError(
"refresh_token_lifetime cannot be set when OAuth delegation is enabled",
("refresh_token_lifetime",),
)
if root.registration.nonrefreshable_access_token_lifetime:
raise ConfigError(
"nonrefreshable_access_token_lifetime cannot be set when OAuth delegation is enabled",
("nonrefreshable_access_token_lifetime",),
)
if root.registration.session_lifetime:
raise ConfigError(
"session_lifetime cannot be set when OAuth delegation is enabled",
("session_lifetime",),
)
if root.registration.enable_3pid_changes:
raise ConfigError(
"enable_3pid_changes cannot be enabled when OAuth delegation is enabled",
("enable_3pid_changes",),
)
@attr.s(auto_attribs=True, frozen=True, slots=True)
class MSC3866Config:
"""Configuration for MSC3866 (mandating approval for new users)"""
# Whether the base support for the approval process is enabled. This includes the
# ability for administrators to check and update the approval of users, even if no
# approval is currently required.
enabled: bool = False
# Whether to require that new users are approved by an admin before their account
# can be used. Note that this setting is ignored if 'enabled' is false.
require_approval_for_new_accounts: bool = False
class ExperimentalConfig(Config):
"""Config section for enabling experimental features"""
section = "experimental"
def read_config(self, config: JsonDict, **kwargs: Any) -> None:
experimental = config.get("experimental_features") or {}
# MSC3026 (busy presence state)
self.msc3026_enabled: bool = experimental.get("msc3026_enabled", False)
# MSC2697 (device dehydration)
# Enabled by default since this option was added after adding the feature.
# It is not recommended that both MSC2697 and MSC3814 both be enabled at
# once.
self.msc2697_enabled: bool = experimental.get("msc2697_enabled", True)
# MSC3814 (dehydrated devices with SSSS)
# This is an alternative method to achieve the same goals as MSC2697.
# It is not recommended that both MSC2697 and MSC3814 both be enabled at
# once.
self.msc3814_enabled: bool = experimental.get("msc3814_enabled", False)
if self.msc2697_enabled and self.msc3814_enabled:
raise ConfigError(
"MSC2697 and MSC3814 should not both be enabled.",
(
"experimental_features",
"msc3814_enabled",
),
)
# MSC3244 (room version capabilities)
self.msc3244_enabled: bool = experimental.get("msc3244_enabled", True)
# MSC3266 (room summary api)
self.msc3266_enabled: bool = experimental.get("msc3266_enabled", False)
# MSC2409 (this setting only relates to optionally sending to-device messages).
# Presence, typing and read receipt EDUs are already sent to application services that
# have opted in to receive them. If enabled, this adds to-device messages to that list.
self.msc2409_to_device_messages_enabled: bool = experimental.get(
"msc2409_to_device_messages_enabled", False
)
# The portion of MSC3202 which is related to device masquerading.
self.msc3202_device_masquerading_enabled: bool = experimental.get(
"msc3202_device_masquerading", False
)
# The portion of MSC3202 related to transaction extensions:
# sending device list changes, one-time key counts and fallback key
# usage to application services.
self.msc3202_transaction_extensions: bool = experimental.get(
"msc3202_transaction_extensions", False
)
# MSC3983: Proxying OTK claim requests to exclusive ASes.
self.msc3983_appservice_otk_claims: bool = experimental.get(
"msc3983_appservice_otk_claims", False
)
# MSC3984: Proxying key queries to exclusive ASes.
self.msc3984_appservice_key_query: bool = experimental.get(
"msc3984_appservice_key_query", False
)
# MSC3720 (Account status endpoint)
self.msc3720_enabled: bool = experimental.get("msc3720_enabled", False)
# MSC2654: Unread counts
#
# Note that enabling this will result in an incorrect unread count for
# previously calculated push actions.
self.msc2654_enabled: bool = experimental.get("msc2654_enabled", False)
# MSC2815 (allow room moderators to view redacted event content)
self.msc2815_enabled: bool = experimental.get("msc2815_enabled", False)
# MSC3391: Removing account data.
self.msc3391_enabled = experimental.get("msc3391_enabled", False)
# MSC3773: Thread notifications
self.msc3773_enabled: bool = experimental.get("msc3773_enabled", False)
# MSC3664: Pushrules to match on related events
self.msc3664_enabled: bool = experimental.get("msc3664_enabled", False)
# MSC3848: Introduce errcodes for specific event sending failures
self.msc3848_enabled: bool = experimental.get("msc3848_enabled", False)
# MSC3852: Expose last seen user agent field on /_matrix/client/v3/devices.
self.msc3852_enabled: bool = experimental.get("msc3852_enabled", False)
# MSC3866: M_USER_AWAITING_APPROVAL error code
raw_msc3866_config = experimental.get("msc3866", {})
self.msc3866 = MSC3866Config(**raw_msc3866_config)
# MSC3881: Remotely toggle push notifications for another client
self.msc3881_enabled: bool = experimental.get("msc3881_enabled", False)
# MSC3874: Filtering /messages with rel_types / not_rel_types.
self.msc3874_enabled: bool = experimental.get("msc3874_enabled", False)
# MSC3886: Simple client rendezvous capability
self.msc3886_endpoint: Optional[str] = experimental.get(
"msc3886_endpoint", None
)
# MSC3890: Remotely silence local notifications
# Note: This option requires "experimental_features.msc3391_enabled" to be
# set to "true", in order to communicate account data deletions to clients.
self.msc3890_enabled: bool = experimental.get("msc3890_enabled", False)
if self.msc3890_enabled and not self.msc3391_enabled:
raise ConfigError(
"Option 'experimental_features.msc3391' must be set to 'true' to "
"enable 'experimental_features.msc3890'. MSC3391 functionality is "
"required to communicate account data deletions to clients."
)
# MSC3381: Polls.
# In practice, supporting polls in Synapse only requires an implementation of
# MSC3930: Push rules for MSC3391 polls; which is what this option enables.
self.msc3381_polls_enabled: bool = experimental.get(
"msc3381_polls_enabled", False
)
# MSC3912: Relation-based redactions.
self.msc3912_enabled: bool = experimental.get("msc3912_enabled", False)
# MSC1767 and friends: Extensible Events
self.msc1767_enabled: bool = experimental.get("msc1767_enabled", False)
if self.msc1767_enabled:
# Enable room version (and thus applicable push rules from MSC3931/3932)
version_id = RoomVersions.MSC1767v10.identifier
KNOWN_ROOM_VERSIONS[version_id] = RoomVersions.MSC1767v10
# MSC3391: Removing account data.
self.msc3391_enabled = experimental.get("msc3391_enabled", False)
# MSC3967: Do not require UIA when first uploading cross signing keys
self.msc3967_enabled = experimental.get("msc3967_enabled", False)
# MSC3981: Recurse relations
self.msc3981_recurse_relations = experimental.get(
"msc3981_recurse_relations", False
)
# MSC3861: Matrix architecture change to delegate authentication via OIDC
try:
self.msc3861 = MSC3861(**experimental.get("msc3861", {}))
except ValueError as exc:
raise ConfigError(
"Invalid MSC3861 configuration", ("experimental", "msc3861")
) from exc
# Check that none of the other config options conflict with MSC3861 when enabled
self.msc3861.check_config_conflicts(self.root)
# MSC4010: Do not allow setting m.push_rules account data.
self.msc4010_push_rules_account_data = experimental.get(
"msc4010_push_rules_account_data", False
)
# MSC4041: Use HTTP header Retry-After to enable library-assisted retry handling
#
# This is a bit hacky, but the most reasonable way to *alway* include the
# headers.
LimitExceededError.include_retry_after_header = experimental.get(
"msc4041_enabled", False
)
self.msc4028_push_encrypted_events = experimental.get(
"msc4028_push_encrypted_events", False
)