MSC2197: Search Filtering in Federation /publicRooms #2197

reivilibre · 2019-07-29T15:31:08Z

This MSC proposes introducing the POST method to the /publicRooms Federation API endpoint, including a filter argument which allows server-side filtering of rooms.

We are motivated by the opportunity to make searching the public Room Directory more efficient over Federation.

Rendered

Signed-off-by: Olivier Wilkinson (reivilibre) <olivier@librepush.net>

proposals/2197-search_filter_in_federation_publicrooms.md

Half-Shot · 2019-07-29T15:45:29Z

proposals/2197-search_filter_in_federation_publicrooms.md

+
+At current, remote homeservers do not learn about what a user has searched for.
+
+However, under this proposal, in the context of using the Federation API to forward on queries from the Client-Server


I can certainly see this being an issue for some users, although I would put forward that you'd expect your search request to be forwarded to a remote homeserver if you are searching within it. There probably needs to be a warning within clients that a remote search will take your data outside the jurisdiction of your own homeserver.

Hopefully something like this wouldn't prompt the need for a full blown consent screen.

turt2live

looks pretty straightforward to me. Good to see that this fixes element-hq/element-web#3327 too :)

proposals/2197-search_filter_in_federation_publicrooms.md

Signed-off-by: Olivier Wilkinson (reivilibre) <olivier@librepush.net>

reivilibre · 2019-08-01T08:29:25Z

As requested, I have rewrapped the lines to 80 chars wide.

lampholder · 2019-08-02T09:58:05Z

There probably needs to be a warning within clients that a remote search will take your data outside the jurisdiction of your own homeserver.

Can we add a line to the spec to client devs telling them they SHOULD display such a warning?

Hopefully something like this wouldn't prompt the need for a full blown consent screen.

Yeah, this definitely feels like it would be too much. The data that's being shared is:

only covered by GDPR if:
- the search terms contain personal data, or
- the user's homeserver IP is uniquely identifying (because it's a single-person homeserver, perhaps)
likely to be expected to be shared with the remote homeserver anyway

But just to remove any ambiguity (both in the users' mind and if we're ever asked to demonstrate our legitimate processing of these search terms on matrix.org) let's advise client devs to implement that warning (and implement that warning in Riots when we can).

ara4n · 2019-08-02T12:34:18Z

this looks generally sane but istr there was a reason why erik didn’t implement it like this in the first place. can’t think of what that would be though, so: lgtm.

we should consider how this interacts with the whole “don’t show public rooms to non-local users” logic though.

proposals/2197-search_filter_in_federation_publicrooms.md

reivilibre · 2019-08-02T12:36:32Z

Sorry @ara4n, please can you clarify what you mean by

don’t show public rooms to non-local users

If you mean the m.federate (in m.room.create state event) stuff, then I don't see any problem.

ara4n · 2019-08-02T12:42:24Z

i meant matrix-org/synapse#5534 - having reviewed, i think we’re fine. ignore me.

turt2live · 2019-08-02T14:08:17Z

barring @lampholder's feedback, I think this is largely ready to go and people seem to agree:

@mscbot fcp merge

mscbot · 2019-08-02T14:08:19Z

Team member @turt2live has proposed to merge this. The next step is review by the rest of the tagged people:

Concerns:

~~@lampholder has feedback~~ resolved by MSC2197: Search Filtering in Federation /publicRooms #2197 (comment)

Once a majority of reviewers approve (and none object), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

See this document for info about what commands tagged team members can give me.

turt2live · 2019-08-02T14:08:28Z

@mscbot concern @lampholder has feedback

proposals/2197-search_filter_in_federation_publicrooms.md

Includes recommendations for client developers. Signed-off-by: Olivier Wilkinson (reivilibre) <olivier@librepush.net>

reivilibre · 2019-08-05T08:52:19Z

I have updated the MSC with your perspective on privacy, @lampholder – I hope you don't mind. Does this seem reasonable now?

I take it to mean that this MSC will lead to us adding this recommendation in the C-S API /publicRooms (perhaps in the documentation for the server parameter?). Am I understanding correctly?

proposals/2197-search_filter_in_federation_publicrooms.md

Signed-off-by: Olivier Wilkinson (reivilibre) <olivier@librepush.net>

turt2live · 2019-08-09T15:42:59Z

proposals/2197-search_filter_in_federation_publicrooms.md

+
+- only covered by GDPR if:
+    - the search terms contain personal data, or
+    - the user's homeserver IP address is uniquely identifying (because it's a


The origin of the homeserver is also shared because of the auth the API requires. If I run a travisralston.me homeserver, it is identified as me. However this is a problem for MSC1228 to solve.

@turt2live Is this resolved now? :)

turt2live

(still)

turt2live · 2019-08-09T15:47:55Z

I think @lampholder's concerns are resolved, and if they aren't then he can add his own concerns. I only really added the concern to make sure that the concerns got addressed before this entered FCP, if that were to happen while @lampholder was on vacation.

However, even if this were to enter FCP today it would still give @lampholder time to make his own concerns (if he wanted to). So, because I haven't pinged @lampholder enough in this comment:

@mscbot resolve @lampholder has feedback

proposals/2197-search_filter_in_federation_publicrooms.md

@turt2live

Thanks to @turt2live Signed-off-by: Olivier Wilkinson (reivilibre) <olivier@librepush.net>

mscbot · 2019-08-15T17:15:52Z

🔔 This is now entering its final comment period, as per the review above. 🔔

mscbot · 2019-08-20T21:33:44Z

The final comment period, with a disposition to merge, as per the review above, is now complete.

turt2live · 2019-08-26T19:57:45Z

Implementation is currently at matrix-org/synapse#5859

See #2197

turt2live · 2019-09-24T19:37:36Z

Spec PR: #2305

turt2live · 2019-09-25T12:39:34Z

Merged 🎉

@Sorunome

Synapse 1.4.0 (2019-10-03) ========================== Bugfixes -------- - Redact `client_secret` in server logs. ([\#6158](#6158)) Synapse 1.4.0rc2 (2019-10-02) ============================= Bugfixes -------- - Fix bug in background update that adds last seen information to the `devices` table, and improve its performance on Postgres. ([\#6135](#6135)) - Fix bad performance of censoring redactions background task. ([\#6141](#6141)) - Fix fetching censored redactions from DB, which caused APIs like initial sync to fail if it tried to include the censored redaction. ([\#6145](#6145)) - Fix exceptions when storing large retry intervals for down remote servers. ([\#6146](#6146)) Internal Changes ---------------- - Fix up sample config entry for `redaction_retention_period` option. ([\#6117](#6117)) Synapse 1.4.0rc1 (2019-09-26) ============================= Note that this release includes significant changes around 3pid verification. Administrators are reminded to review the [upgrade notes](UPGRADE.rst#upgrading-to-v140). Features -------- - Changes to 3pid verification: - Add the ability to send registration emails from the homeserver rather than delegating to an identity server. ([\#5835](#5835), [\#5940](#5940), [\#5993](#5993), [\#5994](#5994), [\#5868](#5868)) - Replace `trust_identity_server_for_password_resets` config option with `account_threepid_delegates`, and make the `id_server` parameteter optional on `*/requestToken` endpoints, as per [MSC2263](matrix-org/matrix-spec-proposals#2263). ([\#5876](#5876), [\#5969](#5969), [\#6028](#6028)) - Switch to using the v2 Identity Service `/lookup` API where available, with fallback to v1. (Implements [MSC2134](matrix-org/matrix-spec-proposals#2134) plus `id_access_token authentication` for v2 Identity Service APIs from [MSC2140](matrix-org/matrix-spec-proposals#2140)). ([\#5897](#5897)) - Remove `bind_email` and `bind_msisdn` parameters from `/register` ala [MSC2140](matrix-org/matrix-spec-proposals#2140). ([\#5964](#5964)) - Add `m.id_access_token` to `unstable_features` in `/versions` as per [MSC2264](matrix-org/matrix-spec-proposals#2264). ([\#5974](#5974)) - Use the v2 Identity Service API for 3PID invites. ([\#5979](#5979)) - Add `POST /_matrix/client/unstable/account/3pid/unbind` endpoint from [MSC2140](matrix-org/matrix-spec-proposals#2140) for unbinding a 3PID from an identity server without removing it from the homeserver user account. ([\#5980](#5980), [\#6062](#6062)) - Use `account_threepid_delegate.email` and `account_threepid_delegate.msisdn` for validating threepid sessions. ([\#6011](#6011)) - Allow homeserver to handle or delegate email validation when adding an email to a user's account. ([\#6042](#6042)) - Implement new Client Server API endpoints `/account/3pid/add` and `/account/3pid/bind` as per [MSC2290](matrix-org/matrix-spec-proposals#2290). ([\#6043](#6043)) - Add an unstable feature flag for separate add/bind 3pid APIs. ([\#6044](#6044)) - Remove `bind` parameter from Client Server POST `/account` endpoint as per [MSC2290](matrix-org/matrix-spec-proposals#2290). ([\#6067](#6067)) - Add `POST /add_threepid/msisdn/submit_token` endpoint for proxying submitToken on an `account_threepid_handler`. ([\#6078](#6078)) - Add `submit_url` response parameter to `*/msisdn/requestToken` endpoints. ([\#6079](#6079)) - Add `m.require_identity_server` flag to /version's unstable_features. ([\#5972](#5972)) - Enhancements to OpenTracing support: - Make OpenTracing work in worker mode. ([\#5771](#5771)) - Pass OpenTracing contexts between servers when transmitting EDUs. ([\#5852](#5852)) - OpenTracing for device list updates. ([\#5853](#5853)) - Add a tag recording a request's authenticated entity and corresponding servlet in OpenTracing. ([\#5856](#5856)) - Add minimum OpenTracing for client servlets. ([\#5983](#5983)) - Check at setup that OpenTracing is installed if it's enabled in the config. ([\#5985](#5985)) - Trace replication send times. ([\#5986](#5986)) - Include missing OpenTracing contexts in outbout replication requests. ([\#5982](#5982)) - Fix sending of EDUs when OpenTracing is enabled with an empty whitelist. ([\#5984](#5984)) - Fix invalid references to None while OpenTracing if the log context slips. ([\#5988](#5988), [\#5991](#5991)) - OpenTracing for room and e2e keys. ([\#5855](#5855)) - Add OpenTracing span over HTTP push processing. ([\#6003](#6003)) - Add an admin API to purge old rooms from the database. ([\#5845](#5845)) - Retry well-known lookups if we have recently seen a valid well-known record for the server. ([\#5850](#5850)) - Add support for filtered room-directory search requests over federation ([MSC2197](matrix-org/matrix-spec-proposals#2197), in order to allow upcoming room directory query performance improvements. ([\#5859](#5859)) - Correctly retry all hosts returned from SRV when we fail to connect. ([\#5864](#5864)) - Add admin API endpoint for setting whether or not a user is a server administrator. ([\#5878](#5878)) - Enable cleaning up extremities with dummy events by default to prevent undue build up of forward extremities. ([\#5884](#5884)) - Add config option to sign remote key query responses with a separate key. ([\#5895](#5895)) - Add support for config templating. ([\#5900](#5900)) - Users with the type of "support" or "bot" are no longer required to consent. ([\#5902](#5902)) - Let synctl accept a directory of config files. ([\#5904](#5904)) - Increase max display name size to 256. ([\#5906](#5906)) - Add admin API endpoint for getting whether or not a user is a server administrator. ([\#5914](#5914)) - Redact events in the database that have been redacted for a week. ([\#5934](#5934)) - New prometheus metrics: - `synapse_federation_known_servers`: represents the total number of servers your server knows about (i.e. is in rooms with), including itself. Enable by setting `metrics_flags.known_servers` to True in the configuration.([\#5981](#5981)) - `synapse_build_info`: exposes the Python version, OS version, and Synapse version of the running server. ([\#6005](#6005)) - Give appropriate exit codes when synctl fails. ([\#5992](#5992)) - Apply the federation blacklist to requests to identity servers. ([\#6000](#6000)) - Add `report_stats_endpoint` option to configure where stats are reported to, if enabled. Contributed by @Sorunome. ([\#6012](#6012)) - Add config option to increase ratelimits for room admins redacting messages. ([\#6015](#6015)) - Stop sending federation transactions to servers which have been down for a long time. ([\#6026](#6026)) - Make the process for mapping SAML2 users to matrix IDs more flexible. ([\#6037](#6037)) - Return a clearer error message when a timeout occurs when attempting to contact an identity server. ([\#6073](#6073)) - Prevent password reset's submit_token endpoint from accepting trailing slashes. ([\#6074](#6074)) - Return 403 on `/register/available` if registration has been disabled. ([\#6082](#6082)) - Explicitly log when a homeserver does not have the `trusted_key_servers` config field configured. ([\#6090](#6090)) - Add support for pruning old rows in `user_ips` table. ([\#6098](#6098)) Bugfixes -------- - Don't create broken room when `power_level_content_override.users` does not contain `creator_id`. ([\#5633](#5633)) - Fix database index so that different backup versions can have the same sessions. ([\#5857](#5857)) - Fix Synapse looking for config options `password_reset_failure_template` and `password_reset_success_template`, when they are actually `password_reset_template_failure_html`, `password_reset_template_success_html`. ([\#5863](#5863)) - Fix stack overflow when recovering an appservice which had an outage. ([\#5885](#5885)) - Fix error message which referred to `public_base_url` instead of `public_baseurl`. Thanks to @aaronraimist for the fix! ([\#5909](#5909)) - Fix 404 for thumbnail download when `dynamic_thumbnails` is `false` and the thumbnail was dynamically generated. Fix reported by rkfg. ([\#5915](#5915)) - Fix a cache-invalidation bug for worker-based deployments. ([\#5920](#5920)) - Fix admin API for listing media in a room not being available with an external media repo. ([\#5966](#5966)) - Fix list media admin API always returning an error. ([\#5967](#5967)) - Fix room and user stats tracking. ([\#5971](#5971), [\#5998](#5998), [\#6029](#6029)) - Return a `M_MISSING_PARAM` if `sid` is not provided to `/account/3pid`. ([\#5995](#5995)) - `federation_certificate_verification_whitelist` now will not cause `TypeErrors` to be raised (a regression in 1.3). Additionally, it now supports internationalised domain names in their non-canonical representation. ([\#5996](#5996)) - Only count real users when checking for auto-creation of auto-join room. ([\#6004](#6004)) - Ensure support users can be registered even if MAU limit is reached. ([\#6020](#6020)) - Fix bug where login error was shown incorrectly on SSO fallback login. ([\#6024](#6024)) - Fix bug in calculating the federation retry backoff period. ([\#6025](#6025)) - Prevent exceptions being logged when extremity-cleanup events fail due to lack of user consent to the terms of service. ([\#6053](#6053)) - Remove POST method from password-reset `submit_token` endpoint until we implement `submit_url` functionality. ([\#6056](#6056)) - Fix logcontext spam on non-Linux platforms. ([\#6059](#6059)) - Ensure query parameters in email validation links are URL-encoded. ([\#6063](#6063)) - Fix a bug which caused SAML attribute maps to be overridden by defaults. ([\#6069](#6069)) - Fix the logged number of updated items for the `users_set_deactivated_flag` background update. ([\#6092](#6092)) - Add `sid` to `next_link` for email validation. ([\#6097](#6097)) - Threepid validity checks on msisdns should not be dependent on `threepid_behaviour_email`. ([\#6104](#6104)) - Ensure that servers which are not configured to support email address verification do not offer it in the registration flows. ([\#6107](#6107)) Updates to the Docker image --------------------------- - Avoid changing `UID/GID` if they are already correct. ([\#5970](#5970)) - Provide `SYNAPSE_WORKER` envvar to specify python module. ([\#6058](#6058)) Improved Documentation ---------------------- - Convert documentation to markdown (from rst) ([\#5849](#5849)) - Update `INSTALL.md` to say that Python 2 is no longer supported. ([\#5953](#5953)) - Add developer documentation for using SAML2. ([\#6032](#6032)) - Add some notes on rolling back to v1.3.1. ([\#6049](#6049)) - Update the upgrade notes. ([\#6050](#6050)) Deprecations and Removals ------------------------- - Remove shared-secret registration from `/_matrix/client/r0/register` endpoint. Contributed by Awesome Technologies Innovationslabor GmbH. ([\#5877](#5877)) - Deprecate the `trusted_third_party_id_servers` option. ([\#5875](#5875)) Internal Changes ---------------- - Lay the groundwork for structured logging output. ([\#5680](#5680)) - Retry well-known lookup before the cache expires, giving a grace period where the remote well-known can be down but we still use the old result. ([\#5844](#5844)) - Remove log line for debugging issue #5407. ([\#5860](#5860)) - Refactor the Appservice scheduler code. ([\#5886](#5886)) - Compatibility with v2 Identity Service APIs other than /lookup. ([\#5892](#5892), [\#6013](#6013)) - Stop populating some unused tables. ([\#5893](#5893), [\#6047](#6047)) - Add missing index on `users_in_public_rooms` to improve the performance of directory queries. ([\#5894](#5894)) - Improve the logging when we have an error when fetching signing keys. ([\#5896](#5896)) - Add support for database engine-specific schema deltas, based on file extension. ([\#5911](#5911)) - Update Buildkite pipeline to use plugins instead of buildkite-agent commands. ([\#5922](#5922)) - Add link in sample config to the logging config schema. ([\#5926](#5926)) - Remove unnecessary parentheses in return statements. ([\#5931](#5931)) - Remove unused `jenkins/prepare_sytest.sh` file. ([\#5938](#5938)) - Move Buildkite pipeline config to the pipelines repo. ([\#5943](#5943)) - Remove unnecessary return statements in the codebase which were the result of a regex run. ([\#5962](#5962)) - Remove left-over methods from v1 registration API. ([\#5963](#5963)) - Cleanup event auth type initialisation. ([\#5975](#5975)) - Clean up dependency checking at setup. ([\#5989](#5989)) - Update OpenTracing docs to use the unified `trace` method. ([\#5776](#5776)) - Small refactor of function arguments and docstrings in` RoomMemberHandler`. ([\#6009](#6009)) - Remove unused `origin` argument on `FederationHandler.add_display_name_to_third_party_invite`. ([\#6010](#6010)) - Add a `failure_ts` column to the `destinations` database table. ([\#6016](#6016), [\#6072](#6072)) - Clean up some code in the retry logic. ([\#6017](#6017)) - Fix the structured logging tests stomping on the global log configuration for subsequent tests. ([\#6023](#6023)) - Clean up the sample config for SAML authentication. ([\#6064](#6064)) - Change mailer logging to reflect Synapse doesn't just do chat notifications by email now. ([\#6075](#6075)) - Move last-seen info into devices table. ([\#6089](#6089)) - Remove unused parameter to `get_user_id_by_threepid`. ([\#6099](#6099)) - Refactor the user-interactive auth handling. ([\#6105](#6105)) - Refactor code for calculating registration flows. ([\#6106](#6106))

MSC for Search Filtering in Federation /publicRooms

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Signed-off-by: Olivier Wilkinson (reivilibre) <olivier@librepush.net>

uhoreg added proposal A matrix spec change proposal proposal-in-review labels Jul 29, 2019

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Rewrap lines in MSC2917 to 80 chars wide

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Signed-off-by: Olivier Wilkinson (reivilibre) <olivier@librepush.net>

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MSC2197: update with privacy perspective

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Includes recommendations for client developers. Signed-off-by: Olivier Wilkinson (reivilibre) <olivier@librepush.net>

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turt2live self-requested a review August 8, 2019 16:20

Addresses some of Andrew's comments

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Domain name is potentially personally-identifying

97f856d

Thanks to @turt2live Signed-off-by: Olivier Wilkinson (reivilibre) <olivier@librepush.net>

mscbot added final-comment-period This MSC has entered a final comment period in interest to approval, postpone, or delete in 5 days. and removed proposed-final-comment-period Currently awaiting signoff of a majority of team members in order to enter the final comment period. labels Aug 15, 2019

richvdh mentioned this pull request Aug 16, 2019

MSC2197 Search Filters over Federation matrix-org/synapse#5859

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Address @richvdh's comments

76f9196

mscbot added finished-final-comment-period and removed final-comment-period This MSC has entered a final comment period in interest to approval, postpone, or delete in 5 days. labels Aug 20, 2019

turt2live merged commit 53a2ffb into matrix-org:master Aug 20, 2019

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turt2live added this to Implementation stages in Client-server r0.6 proposals Aug 26, 2019

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turt2live added a commit that referenced this pull request Sep 24, 2019

Add s2s POST /publicRooms per MSC2197

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See #2197

turt2live mentioned this pull request Sep 24, 2019

Add s2s POST /publicRooms per MSC2197 #2305

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MSC2197: Search Filtering in Federation /publicRooms #2197

MSC2197: Search Filtering in Federation /publicRooms #2197

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		At current, remote homeservers do not learn about what a user has searched for.

		However, under this proposal, in the context of using the Federation API to forward on queries from the Client-Server

MSC2197: Search Filtering in Federation /publicRooms #2197

MSC2197: Search Filtering in Federation /publicRooms #2197

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