Block clients from sending server ACLs that lock the local server out. #8708

erikjohnston · 2020-11-03T10:21:21Z

Fixes #4042

anoadragon453

Some wording things, but otherwise looks great functionality-wise!

changelog.d/8708.misc

synapse/events/validator.py

tests/handlers/test_message.py

anoadragon453 · 2020-11-03T10:33:01Z

synapse/handlers/message.py

@@ -1159,6 +1159,9 @@ def is_inviter_member_event(e):
                if original_event.room_id != event.room_id:
                    raise SynapseError(400, "Cannot redact event from a different room")


hmm, this should probably be a 403, alas. out of scope for this PR though.

No, this is a 400; redacting a room's event using a different room ID is ill-formed, it is not "well-formed but forbidden".

tests/handlers/test_message.py

Co-authored-by: Andrew Morgan <[email protected]>

@dklimpel

Synapse 1.23.0 (2020-11-18) =========================== This release changes the way structured logging is configured. See the [upgrade notes](UPGRADE.rst#upgrading-to-v1230) for details. **Note**: We are aware of a trivially exploitable denial of service vulnerability in versions of Synapse prior to 1.20.0. Complete details will be disclosed on Monday, November 23rd. If you have not upgraded recently, please do so. Bugfixes -------- - Fix a dependency versioning bug in the Dockerfile that prevented Synapse from starting. ([\#8767](matrix-org/synapse#8767)) Synapse 1.23.0rc1 (2020-11-13) ============================== Features -------- - Add a push rule that highlights when a jitsi conference is created in a room. ([\#8286](matrix-org/synapse#8286)) - Add an admin api to delete a single file or files that were not used for a defined time from server. Contributed by @dklimpel. ([\#8519](matrix-org/synapse#8519)) - Split admin API for reported events (`GET /_synapse/admin/v1/event_reports`) into detail and list endpoints. This is a breaking change to #8217 which was introduced in Synapse v1.21.0. Those who already use this API should check their scripts. Contributed by @dklimpel. ([\#8539](matrix-org/synapse#8539)) - Support generating structured logs via the standard logging configuration. ([\#8607](matrix-org/synapse#8607), [\#8685](matrix-org/synapse#8685)) - Add an admin API to allow server admins to list users' pushers. Contributed by @dklimpel. ([\#8610](matrix-org/synapse#8610), [\#8689](matrix-org/synapse#8689)) - Add an admin API `GET /_synapse/admin/v1/users/<user_id>/media` to get information about uploaded media. Contributed by @dklimpel. ([\#8647](matrix-org/synapse#8647)) - Add an admin API for local user media statistics. Contributed by @dklimpel. ([\#8700](matrix-org/synapse#8700)) - Add `displayname` to Shared-Secret Registration for admins. ([\#8722](matrix-org/synapse#8722)) Bugfixes -------- - Fix fetching of E2E cross signing keys over federation when only one of the master key and device signing key is cached already. ([\#8455](matrix-org/synapse#8455)) - Fix a bug where Synapse would blindly forward bad responses from federation to clients when retrieving profile information. ([\#8580](matrix-org/synapse#8580)) - Fix a bug where the account validity endpoint would silently fail if the user ID did not have an expiration time. It now returns a 400 error. ([\#8620](matrix-org/synapse#8620)) - Fix email notifications for invites without local state. ([\#8627](matrix-org/synapse#8627)) - Fix handling of invalid group IDs to return a 400 rather than log an exception and return a 500. ([\#8628](matrix-org/synapse#8628)) - Fix handling of User-Agent headers that are invalid UTF-8, which caused user agents of users to not get correctly recorded. ([\#8632](matrix-org/synapse#8632)) - Fix a bug in the `joined_rooms` admin API if the user has never joined any rooms. The bug was introduced, along with the API, in v1.21.0. ([\#8643](matrix-org/synapse#8643)) - Fix exception during handling multiple concurrent requests for remote media when using multiple media repositories. ([\#8682](matrix-org/synapse#8682)) - Fix bug that prevented Synapse from recovering after losing connection to the database. ([\#8726](matrix-org/synapse#8726)) - Fix bug where the `/_synapse/admin/v1/send_server_notice` API could send notices to non-notice rooms. ([\#8728](matrix-org/synapse#8728)) - Fix PostgreSQL port script fails when DB has no backfilled events. Broke in v1.21.0. ([\#8729](matrix-org/synapse#8729)) - Fix PostgreSQL port script to correctly handle foreign key constraints. Broke in v1.21.0. ([\#8730](matrix-org/synapse#8730)) - Fix PostgreSQL port script so that it can be run again after a failure. Broke in v1.21.0. ([\#8755](matrix-org/synapse#8755)) Improved Documentation ---------------------- - Instructions for Azure AD in the OpenID Connect documentation. Contributed by peterk. ([\#8582](matrix-org/synapse#8582)) - Improve the sample configuration for single sign-on providers. ([\#8635](matrix-org/synapse#8635)) - Fix the filepath of Dex's example config and the link to Dex's Getting Started guide in the OpenID Connect docs. ([\#8657](matrix-org/synapse#8657)) - Note support for Python 3.9. ([\#8665](matrix-org/synapse#8665)) - Minor updates to docs on running tests. ([\#8666](matrix-org/synapse#8666)) - Interlink prometheus/grafana documentation. ([\#8667](matrix-org/synapse#8667)) - Notes on SSO logins and media_repository worker. ([\#8701](matrix-org/synapse#8701)) - Document experimental support for running multiple event persisters. ([\#8706](matrix-org/synapse#8706)) - Add information regarding the various sources of, and expected contributions to, Synapse's documentation to `CONTRIBUTING.md`. ([\#8714](matrix-org/synapse#8714)) - Migrate documentation `docs/admin_api/event_reports` to markdown. ([\#8742](matrix-org/synapse#8742)) - Add some helpful hints to the README for new Synapse developers. Contributed by @chagai95. ([\#8746](matrix-org/synapse#8746)) Internal Changes ---------------- - Optimise `/createRoom` with multiple invited users. ([\#8559](matrix-org/synapse#8559)) - Implement and use an `@lru_cache` decorator. ([\#8595](matrix-org/synapse#8595)) - Don't instansiate Requester directly. ([\#8614](matrix-org/synapse#8614)) - Type hints for `RegistrationStore`. ([\#8615](matrix-org/synapse#8615)) - Change schema to support access tokens belonging to one user but granting access to another. ([\#8616](matrix-org/synapse#8616)) - Remove unused OPTIONS handlers. ([\#8621](matrix-org/synapse#8621)) - Run `mypy` as part of the lint.sh script. ([\#8633](matrix-org/synapse#8633)) - Correct Synapse's PyPI package name in the OpenID Connect installation instructions. ([\#8634](matrix-org/synapse#8634)) - Catch exceptions during initialization of `password_providers`. Contributed by Nicolai Søborg. ([\#8636](matrix-org/synapse#8636)) - Fix typos and spelling errors in the code. ([\#8639](matrix-org/synapse#8639)) - Reduce number of OpenTracing spans started. ([\#8640](matrix-org/synapse#8640), [\#8668](matrix-org/synapse#8668), [\#8670](matrix-org/synapse#8670)) - Add field `total` to device list in admin API. ([\#8644](matrix-org/synapse#8644)) - Add more type hints to the application services code. ([\#8655](matrix-org/synapse#8655), [\#8693](matrix-org/synapse#8693)) - Tell Black to format code for Python 3.5. ([\#8664](matrix-org/synapse#8664)) - Don't pull event from DB when handling replication traffic. ([\#8669](matrix-org/synapse#8669)) - Abstract some invite-related code in preparation for landing knocking. ([\#8671](matrix-org/synapse#8671), [\#8688](matrix-org/synapse#8688)) - Clarify representation of events in logfiles. ([\#8679](matrix-org/synapse#8679)) - Don't require `hiredis` package to be installed to run unit tests. ([\#8680](matrix-org/synapse#8680)) - Fix typing info on cache call signature to accept `on_invalidate`. ([\#8684](matrix-org/synapse#8684)) - Fail tests if they do not await coroutines. ([\#8690](matrix-org/synapse#8690)) - Improve start time by adding an index to `e2e_cross_signing_keys.stream_id`. ([\#8694](matrix-org/synapse#8694)) - Re-organize the structured logging code to separate the TCP transport handling from the JSON formatting. ([\#8697](matrix-org/synapse#8697)) - Use Python 3.8 in Docker images by default. ([\#8698](matrix-org/synapse#8698)) - Remove the "draft" status of the Room Details Admin API. ([\#8702](matrix-org/synapse#8702)) - Improve the error returned when a non-string displayname or avatar_url is used when updating a user's profile. ([\#8705](matrix-org/synapse#8705)) - Block attempts by clients to send server ACLs, or redactions of server ACLs, that would result in the local server being blocked from the room. ([\#8708](matrix-org/synapse#8708)) - Add metrics the allow the local sysadmin to track 3PID `/requestToken` requests. ([\#8712](matrix-org/synapse#8712)) - Consolidate duplicated lists of purged tables that are checked in tests. ([\#8713](matrix-org/synapse#8713)) - Add some `mdui:UIInfo` element examples for `saml2_config` in the homeserver config. ([\#8718](matrix-org/synapse#8718)) - Improve the error message returned when a remote server incorrectly sets the `Content-Type` header in response to a JSON request. ([\#8719](matrix-org/synapse#8719)) - Speed up repeated state resolutions on the same room by caching event ID to auth event ID lookups. ([\#8752](matrix-org/synapse#8752)) Synapse 1.22.1 (2020-10-30) =========================== Bugfixes -------- - Fix a bug where an appservice may not be forwarded events for a room it was recently invited to. Broke in v1.22.0. ([\#8676](matrix-org/synapse#8676)) - Fix `Object of type frozendict is not JSON serializable` exceptions when using third-party event rules. Broke in v1.22.0. ([\#8678](matrix-org/synapse#8678))

erikjohnston added 4 commits November 3, 2020 10:03

Add some typing

febd39a

Block server acl on CS API that block local server

784dc5a

Block redactions of server acl on CS API

b0667dd

Newsfile

b0594c7

erikjohnston requested a review from a team November 3, 2020 10:24

Merge remote-tracking branch 'origin/develop' into erikj/acl_filter

2b8de0e

anoadragon453 approved these changes Nov 3, 2020

View reviewed changes

WORDS WORDS WORDS

8f85440

Co-authored-by: Andrew Morgan <[email protected]>

erikjohnston merged commit 243d427 into develop Nov 3, 2020

erikjohnston deleted the erikj/acl_filter branch November 3, 2020 12:13

jaywink restored the erikj/acl_filter branch November 4, 2020 08:33

jaywink deleted the erikj/acl_filter branch November 4, 2020 08:33

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Block clients from sending server ACLs that lock the local server out. #8708

Block clients from sending server ACLs that lock the local server out. #8708

erikjohnston commented Nov 3, 2020

anoadragon453 left a comment

anoadragon453 Nov 3, 2020

erkinalp Jan 29, 2022

		@@ -1159,6 +1159,9 @@ def is_inviter_member_event(e):
		if original_event.room_id != event.room_id:
		raise SynapseError(400, "Cannot redact event from a different room")

Block clients from sending server ACLs that lock the local server out. #8708

Block clients from sending server ACLs that lock the local server out. #8708

Conversation

erikjohnston commented Nov 3, 2020

anoadragon453 left a comment

Choose a reason for hiding this comment

anoadragon453 Nov 3, 2020

Choose a reason for hiding this comment

erkinalp Jan 29, 2022

Choose a reason for hiding this comment