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https://github.com/element-hq/synapse
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Merge pull request #3257 from matrix-org/rav/fonx_on_no_consent
Reject attempts to send event before privacy consent is given
This commit is contained in:
commit
3b2def6c7a
6 changed files with 179 additions and 2 deletions
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@ -19,6 +19,7 @@ import logging
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import simplejson as json
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from six import iteritems
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from six.moves import http_client
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logger = logging.getLogger(__name__)
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@ -51,6 +52,7 @@ class Codes(object):
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THREEPID_DENIED = "M_THREEPID_DENIED"
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INVALID_USERNAME = "M_INVALID_USERNAME"
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SERVER_NOT_TRUSTED = "M_SERVER_NOT_TRUSTED"
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CONSENT_NOT_GIVEN = "M_CONSENT_NOT_GIVEN"
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class CodeMessageException(RuntimeError):
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@ -138,6 +140,32 @@ class SynapseError(CodeMessageException):
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return res
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class ConsentNotGivenError(SynapseError):
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"""The error returned to the client when the user has not consented to the
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privacy policy.
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"""
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def __init__(self, msg, consent_uri):
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"""Constructs a ConsentNotGivenError
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Args:
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msg (str): The human-readable error message
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consent_url (str): The URL where the user can give their consent
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"""
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super(ConsentNotGivenError, self).__init__(
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code=http_client.FORBIDDEN,
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msg=msg,
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errcode=Codes.CONSENT_NOT_GIVEN
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)
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self._consent_uri = consent_uri
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def error_dict(self):
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return cs_error(
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self.msg,
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self.errcode,
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consent_uri=self._consent_uri
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)
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class RegistrationError(SynapseError):
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"""An error raised when a registration event fails."""
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pass
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@ -292,7 +320,7 @@ def cs_error(msg, code=Codes.UNKNOWN, **kwargs):
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Args:
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msg (str): The error message.
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code (int): The error code.
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code (str): The error code.
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kwargs : Additional keys to add to the response.
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Returns:
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A dict representing the error response JSON.
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@ -1,5 +1,6 @@
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# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2018 New Vector Ltd.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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@ -14,6 +15,12 @@
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# limitations under the License.
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"""Contains the URL paths to prefix various aspects of the server with. """
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from hashlib import sha256
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import hmac
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from six.moves.urllib.parse import urlencode
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from synapse.config import ConfigError
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CLIENT_PREFIX = "/_matrix/client/api/v1"
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CLIENT_V2_ALPHA_PREFIX = "/_matrix/client/v2_alpha"
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@ -25,3 +32,46 @@ SERVER_KEY_PREFIX = "/_matrix/key/v1"
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SERVER_KEY_V2_PREFIX = "/_matrix/key/v2"
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MEDIA_PREFIX = "/_matrix/media/r0"
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LEGACY_MEDIA_PREFIX = "/_matrix/media/v1"
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class ConsentURIBuilder(object):
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def __init__(self, hs_config):
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"""
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Args:
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hs_config (synapse.config.homeserver.HomeServerConfig):
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"""
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if hs_config.form_secret is None:
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raise ConfigError(
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"form_secret not set in config",
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)
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if hs_config.public_baseurl is None:
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raise ConfigError(
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"public_baseurl not set in config",
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)
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self._hmac_secret = hs_config.form_secret.encode("utf-8")
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self._public_baseurl = hs_config.public_baseurl
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def build_user_consent_uri(self, user_id):
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"""Build a URI which we can give to the user to do their privacy
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policy consent
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Args:
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user_id (str): mxid or username of user
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Returns
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(str) the URI where the user can do consent
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"""
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mac = hmac.new(
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key=self._hmac_secret,
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msg=user_id,
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digestmod=sha256,
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).hexdigest()
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consent_uri = "%s_matrix/consent?%s" % (
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self._public_baseurl,
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urlencode({
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"u": user_id,
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"h": mac
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}),
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)
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return consent_uri
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@ -34,6 +34,10 @@ DEFAULT_CONFIG = """\
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# asking them to consent to the privacy policy. The 'server_notices' section
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# must also be configured for this to work.
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#
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# 'block_events_error', if set, will block any attempts to send events
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# until the user consents to the privacy policy. The value of the setting is
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# used as the text of the error.
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#
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# user_consent:
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# template_dir: res/templates/privacy
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# version: 1.0
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@ -41,6 +45,8 @@ DEFAULT_CONFIG = """\
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# msgtype: m.text
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# body: |
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# Pls do consent kthx
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# block_events_error: |
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# You can't send any messages until you consent to the privacy policy.
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"""
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@ -51,6 +57,7 @@ class ConsentConfig(Config):
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self.user_consent_version = None
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self.user_consent_template_dir = None
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self.user_consent_server_notice_content = None
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self.block_events_without_consent_error = None
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def read_config(self, config):
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consent_config = config.get("user_consent")
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@ -61,6 +68,9 @@ class ConsentConfig(Config):
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self.user_consent_server_notice_content = consent_config.get(
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"server_notice_content",
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)
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self.block_events_without_consent_error = consent_config.get(
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"block_events_error",
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)
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def default_config(self, **kwargs):
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return DEFAULT_CONFIG
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@ -20,10 +20,15 @@ import sys
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from canonicaljson import encode_canonical_json
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import six
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from twisted.internet import defer, reactor
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from twisted.internet.defer import succeed
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from twisted.python.failure import Failure
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from synapse.api.constants import EventTypes, Membership, MAX_DEPTH
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from synapse.api.errors import AuthError, Codes, SynapseError
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from synapse.api.errors import (
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AuthError, Codes, SynapseError,
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ConsentNotGivenError,
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)
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from synapse.api.urls import ConsentURIBuilder
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from synapse.crypto.event_signing import add_hashes_and_signatures
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from synapse.events.utils import serialize_event
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from synapse.events.validator import EventValidator
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@ -431,6 +436,9 @@ class EventCreationHandler(object):
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self.spam_checker = hs.get_spam_checker()
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if self.config.block_events_without_consent_error is not None:
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self._consent_uri_builder = ConsentURIBuilder(self.config)
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@defer.inlineCallbacks
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def create_event(self, requester, event_dict, token_id=None, txn_id=None,
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prev_events_and_hashes=None):
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@ -482,6 +490,10 @@ class EventCreationHandler(object):
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target, e
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)
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is_exempt = yield self._is_exempt_from_privacy_policy(builder)
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if not is_exempt:
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yield self.assert_accepted_privacy_policy(requester)
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if token_id is not None:
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builder.internal_metadata.token_id = token_id
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@ -496,6 +508,78 @@ class EventCreationHandler(object):
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defer.returnValue((event, context))
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def _is_exempt_from_privacy_policy(self, builder):
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""""Determine if an event to be sent is exempt from having to consent
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to the privacy policy
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Args:
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builder (synapse.events.builder.EventBuilder): event being created
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Returns:
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Deferred[bool]: true if the event can be sent without the user
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consenting
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"""
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# the only thing the user can do is join the server notices room.
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if builder.type == EventTypes.Member:
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membership = builder.content.get("membership", None)
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if membership == Membership.JOIN:
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return self._is_server_notices_room(builder.room_id)
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return succeed(False)
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@defer.inlineCallbacks
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def _is_server_notices_room(self, room_id):
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if self.config.server_notices_mxid is None:
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defer.returnValue(False)
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user_ids = yield self.store.get_users_in_room(room_id)
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defer.returnValue(self.config.server_notices_mxid in user_ids)
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@defer.inlineCallbacks
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def assert_accepted_privacy_policy(self, requester):
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"""Check if a user has accepted the privacy policy
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Called when the given user is about to do something that requires
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privacy consent. We see if the user is exempt and otherwise check that
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they have given consent. If they have not, a ConsentNotGiven error is
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raised.
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Args:
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requester (synapse.types.Requester):
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The user making the request
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Returns:
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Deferred[None]: returns normally if the user has consented or is
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exempt
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Raises:
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ConsentNotGivenError: if the user has not given consent yet
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"""
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if self.config.block_events_without_consent_error is None:
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return
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# exempt AS users from needing consent
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if requester.app_service is not None:
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return
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user_id = requester.user.to_string()
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# exempt the system notices user
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if (
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self.config.server_notices_mxid is not None and
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user_id == self.config.server_notices_mxid
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):
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return
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u = yield self.store.get_user_by_id(user_id)
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assert u is not None
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if u["consent_version"] == self.config.user_consent_version:
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return
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consent_uri = self._consent_uri_builder.build_user_consent_uri(user_id)
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raise ConsentNotGivenError(
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msg=self.config.block_events_without_consent_error,
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consent_uri=consent_uri,
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)
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@defer.inlineCallbacks
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def send_nonmember_event(self, requester, event, context, ratelimit=True):
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"""
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@ -126,6 +126,10 @@ class RoomCreationHandler(BaseHandler):
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except Exception:
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raise SynapseError(400, "Invalid user_id: %s" % (i,))
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yield self.event_creation_handler.assert_accepted_privacy_policy(
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requester,
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)
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invite_3pid_list = config.get("invite_3pid", [])
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visibility = config.get("visibility", None)
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@ -64,6 +64,7 @@ def setup_test_homeserver(name="test", datastore=None, config=None, **kargs):
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config.filter_timeline_limit = 5000
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config.user_directory_search_all_users = False
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config.user_consent_server_notice_content = None
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config.block_events_without_consent_error = None
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# disable user directory updates, because they get done in the
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# background, which upsets the test runner.
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