Skip to content
This repository has been archived by the owner on Apr 26, 2024. It is now read-only.

Fix missing null character check on guest_access room state #8373

Merged
merged 2 commits into from
Sep 23, 2020

Conversation

anoadragon453
Copy link
Member

@anoadragon453 anoadragon453 commented Sep 22, 2020

When updating the room_stats_state table, we try to check for null bytes slipping in to the content for state events. It turns out we had added guest_access as a field to room_stats_state without including it in the null byte check.

Lo and behold, a null byte in a m.room.guest_access event then breaks room_stats_state updates.

This PR adds the check for guest_access, as well as adding an assert if a field is added to room_stats_state without being either explicitly included or not included in the null byte check.

I think this broke in 6e834e9#diff-9fb8e219f876ae3f280bc88c8b9ea972R285.

@anoadragon453 anoadragon453 requested a review from a team September 22, 2020 13:54
Comment on lines 260 to 262
# Calling code should only include keys in the above column lists. Otherwise
# we should never reach here
assert "Unknown column name '%s'" % (column_name,)
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

This doesn't seem correct.

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Oh, I don't even add the value to state_dict in the correct case 🤦‍♂️ Is that what you meant?

Otherwise the assert here was supposed to alert a developer that they've put something in fields that update_room_state didn't know about, but perhaps that's not a necessary thing to raise?

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

This was not enough info...

I don't think this will do anything since it is missing a boolean statement, e.g. this becomes assert bool("...") which resolves to assert True, which won't do anything.

Since the callers to this are internal I suspect we should raise a ValueError in this case.

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Works for me.

# This field contained invalid str data, replace its contents with NULL
state_dict[column_name] = None
elif column_name in other_columns:
if isinstance(field, str):
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

This seems like a weird check? It means we can pass in an object and this wouldn't error?

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

It's also not currently possible in the calling code for is_federatable to be anything other than a bool, even with malicious input. So we can probably just remove this check.

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

That's the reasoning I didn't add one when previously poking at this!

state_dict = {}
sentinel = object()

for column_name in fields.keys():
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Seems like it would be simpler to iterate over str_columns and then you don't have to check if column_name in str_columns.

The current implementation of iterating the keys, then get with a sentinel doesn't really make sense.

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

You're right that the sentinel is no longer necessary. Will axe 🪓

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I think it is still necessary, it is there to differentiate an incoming value in fields of None from the key not existing in the incoming dict.

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

jk, it is necessary so that we won't override old values.

When updating room_stats_state, we try to check for null bytes slipping
in to the
content for state events. It turns out we had added guest_access as a
field to
room_stats_state without including it in the null byte check.

Lo and behold, a null byte in a m.room.guest_access event then breaks
room_stats_state
updates.

This PR adds the check for guest_access. A further PR will improve this
function so that this hopefully does not happen again in future.
@anoadragon453 anoadragon453 force-pushed the anoa/fix_missing_guest_access_null_check branch from 822578f to 48336ee Compare September 22, 2020 18:42
@anoadragon453
Copy link
Member Author

@clokep I've switched up this PR to just fix the bug. I'll submit another PR to refactor things in a nicer way :)

@anoadragon453 anoadragon453 merged commit 4bb203e into develop Sep 23, 2020
@anoadragon453 anoadragon453 deleted the anoa/fix_missing_guest_access_null_check branch September 23, 2020 14:58
richvdh added a commit that referenced this pull request Oct 1, 2020
Synapse 1.21.0rc1 (2020-10-01)
==============================

Features
--------

- Require the user to confirm that their password should be reset after clicking the email confirmation link. ([\#8004](#8004))
- Add an admin API `GET /_synapse/admin/v1/event_reports` to read entries of table `event_reports`. Contributed by @dklimpel. ([\#8217](#8217))
- Consolidate the SSO error template across all configuration. ([\#8248](#8248), [\#8405](#8405))
- Add a configuration option to specify a whitelist of domains that a user can be redirected to after validating their email or phone number. ([\#8275](#8275), [\#8417](#8417))
- Add experimental support for sharding event persister. ([\#8294](#8294), [\#8387](#8387), [\#8396](#8396), [\#8419](#8419))
- Add the room topic and avatar to the room details admin API. ([\#8305](#8305))
- Add an admin API for querying rooms where a user is a member. Contributed by @dklimpel. ([\#8306](#8306))
- Add `uk.half-shot.msc2778.login.application_service` login type to allow appservices to login. ([\#8320](#8320))
- Add a configuration option that allows existing users to log in with OpenID Connect. Contributed by @BBBSnowball and @OmmyZhang. ([\#8345](#8345))
- Add prometheus metrics for replication requests. ([\#8406](#8406))
- Support passing additional single sign-on parameters to the client. ([\#8413](#8413))
- Add experimental reporting of metrics on expensive rooms for state-resolution. ([\#8420](#8420))
- Add experimental prometheus metric to track numbers of "large" rooms for state resolutiom. ([\#8425](#8425))
- Add prometheus metrics to track federation delays. ([\#8430](#8430))

Bugfixes
--------

- Fix a bug in the media repository where remote thumbnails with the same size but different crop methods would overwrite each other. Contributed by @deepbluev7. ([\#7124](#7124))
- Fix inconsistent handling of non-existent push rules, and stop tracking the `enabled` state of removed push rules. ([\#7796](#7796))
- Fix a longstanding bug when storing a media file with an empty `upload_name`. ([\#7905](#7905))
- Fix messages not being sent over federation until an event is sent into the same room. ([\#8230](#8230), [\#8247](#8247), [\#8258](#8258), [\#8272](#8272), [\#8322](#8322))
- Fix a longstanding bug where files that could not be thumbnailed would result in an Internal Server Error. ([\#8236](#8236), [\#8435](#8435))
- Upgrade minimum version of `canonicaljson` to version 1.4.0, to fix an unicode encoding issue. ([\#8262](#8262))
- Fix longstanding bug which could lead to incomplete database upgrades on SQLite. ([\#8265](#8265))
- Fix stack overflow when stderr is redirected to the logging system, and the logging system encounters an error. ([\#8268](#8268))
- Fix a bug which cause the logging system to report errors, if `DEBUG` was enabled and no `context` filter was applied. ([\#8278](#8278))
- Fix edge case where push could get delayed for a user until a later event was pushed. ([\#8287](#8287))
- Fix fetching malformed events from remote servers. ([\#8324](#8324))
- Fix `UnboundLocalError` from occuring when appservices send a malformed register request. ([\#8329](#8329))
- Don't send push notifications to expired user accounts. ([\#8353](#8353))
- Fix a regression in v1.19.0 with reactivating users through the admin API. ([\#8362](#8362))
- Fix a bug where during device registration the length of the device name wasn't limited. ([\#8364](#8364))
- Include `guest_access` in the fields that are checked for null bytes when updating `room_stats_state`. Broke in v1.7.2. ([\#8373](#8373))
- Fix theoretical race condition where events are not sent down `/sync` if the synchrotron worker is restarted without restarting other workers. ([\#8374](#8374))
- Fix a bug which could cause errors in rooms with malformed membership events, on servers using sqlite. ([\#8385](#8385))
- Fix "Re-starting finished log context" warning when receiving an event we already had over federation. ([\#8398](#8398))
- Fix incorrect handling of timeouts on outgoing HTTP requests. ([\#8400](#8400))
- Fix a regression in v1.20.0 in the `synapse_port_db` script regarding the `ui_auth_sessions_ips` table. ([\#8410](#8410))
- Remove unnecessary 3PID registration check when resetting password via an email address. Bug introduced in v0.34.0rc2. ([\#8414](#8414))

Improved Documentation
----------------------

- Add `/_synapse/client` to the reverse proxy documentation. ([\#8227](#8227))
- Add note to the reverse proxy settings documentation about disabling Apache's mod_security2. Contributed by Julian Fietkau (@jfietkau). ([\#8375](#8375))
- Improve description of `server_name` config option in `homserver.yaml`. ([\#8415](#8415))

Deprecations and Removals
-------------------------

- Drop support for `prometheus_client` older than 0.4.0. ([\#8426](#8426))

Internal Changes
----------------

- Fix tests on distros which disable TLSv1.0. Contributed by @danc86. ([\#8208](#8208))
- Simplify the distributor code to avoid unnecessary work. ([\#8216](#8216))
- Remove the `populate_stats_process_rooms_2` background job and restore functionality to `populate_stats_process_rooms`. ([\#8243](#8243))
- Clean up type hints for `PaginationConfig`. ([\#8250](#8250), [\#8282](#8282))
- Track the latest event for every destination and room for catch-up after federation outage. ([\#8256](#8256))
- Fix non-user visible bug in implementation of `MultiWriterIdGenerator.get_current_token_for_writer`. ([\#8257](#8257))
- Switch to the JSON implementation from the standard library. ([\#8259](#8259))
- Add type hints to `synapse.util.async_helpers`. ([\#8260](#8260))
- Simplify tests that mock asynchronous functions. ([\#8261](#8261))
- Add type hints to `StreamToken` and `RoomStreamToken` classes. ([\#8279](#8279))
- Change `StreamToken.room_key` to be a `RoomStreamToken` instance. ([\#8281](#8281))
- Refactor notifier code to correctly use the max event stream position. ([\#8288](#8288))
- Use slotted classes where possible. ([\#8296](#8296))
- Support testing the local Synapse checkout against the [Complement homeserver test suite](https://github.com/matrix-org/complement/). ([\#8317](#8317))
- Update outdated usages of `metaclass` to python 3 syntax. ([\#8326](#8326))
- Move lint-related dependencies to package-extra field, update CONTRIBUTING.md to utilise this. ([\#8330](#8330), [\#8377](#8377))
- Use the `admin_patterns` helper in additional locations. ([\#8331](#8331))
- Fix test logging to allow braces in log output. ([\#8335](#8335))
- Remove `__future__` imports related to Python 2 compatibility. ([\#8337](#8337))
- Simplify `super()` calls to Python 3 syntax. ([\#8344](#8344))
- Fix bad merge from `release-v1.20.0` branch to `develop`. ([\#8354](#8354))
- Factor out a `_send_dummy_event_for_room` method. ([\#8370](#8370))
- Improve logging of state resolution. ([\#8371](#8371))
- Add type annotations to `SimpleHttpClient`. ([\#8372](#8372))
- Refactor ID generators to use `async with` syntax. ([\#8383](#8383))
- Add `EventStreamPosition` type. ([\#8388](#8388))
- Create a mechanism for marking tests "logcontext clean". ([\#8399](#8399))
- A pair of tiny cleanups in the federation request code. ([\#8401](#8401))
- Add checks on startup that PostgreSQL sequences are consistent with their associated tables. ([\#8402](#8402))
- Do not include appservice users when calculating the total MAU for a server. ([\#8404](#8404))
- Typing fixes for `synapse.handlers.federation`. ([\#8422](#8422))
- Various refactors to simplify stream token handling. ([\#8423](#8423))
- Make stream token serializing/deserializing async. ([\#8427](#8427))
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Oct 17, 2020
Synapse 1.21.2 (2020-10-15)
===========================

Debian packages and Docker images have been rebuilt using the latest versions of dependency libraries, including authlib 0.15.1. Please see bugfixes below.

Security advisory
-----------------

* HTML pages served via Synapse were vulnerable to cross-site scripting (XSS)
  attacks. All server administrators are encouraged to upgrade.
  ([\#8444](matrix-org/synapse#8444))
  ([CVE-2020-26891](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26891))

  This fix was originally included in v1.21.0 but was missing a security advisory.

  This was reported by [Denis Kasak](https://github.com/dkasak).

Bugfixes
--------

- Fix rare bug where sending an event would fail due to a racey assertion. ([\#8530](matrix-org/synapse#8530))
- An updated version of the authlib dependency is included in the Docker and Debian images to fix an issue using OpenID Connect. See [\#8534](matrix-org/synapse#8534) for details.


Synapse 1.21.1 (2020-10-13)
===========================

This release fixes a regression in v1.21.0 that prevented debian packages from being built.
It is otherwise identical to v1.21.0.

Synapse 1.21.0 (2020-10-12)
===========================

No significant changes since v1.21.0rc3.

As [noted in
v1.20.0](https://github.com/matrix-org/synapse/blob/release-v1.21.0/CHANGES.md#synapse-1200-2020-09-22),
a future release will drop support for accessing Synapse's
[Admin API](https://github.com/matrix-org/synapse/tree/master/docs/admin_api) under the
`/_matrix/client/*` endpoint prefixes. At that point, the Admin API will only
be accessible under `/_synapse/admin`.


Synapse 1.21.0rc3 (2020-10-08)
==============================

Bugfixes
--------

- Fix duplication of events on high traffic servers, caused by PostgreSQL `could not serialize access due to concurrent update` errors. ([\#8456](matrix-org/synapse#8456))


Internal Changes
----------------

- Add Groovy Gorilla to the list of distributions we build `.deb`s for. ([\#8475](matrix-org/synapse#8475))


Synapse 1.21.0rc2 (2020-10-02)
==============================

Features
--------

- Convert additional templates from inline HTML to Jinja2 templates. ([\#8444](matrix-org/synapse#8444))

Bugfixes
--------

- Fix a regression in v1.21.0rc1 which broke thumbnails of remote media. ([\#8438](matrix-org/synapse#8438))
- Do not expose the experimental `uk.half-shot.msc2778.login.application_service` flow in the login API, which caused a compatibility problem with Element iOS. ([\#8440](matrix-org/synapse#8440))
- Fix malformed log line in new federation "catch up" logic. ([\#8442](matrix-org/synapse#8442))
- Fix DB query on startup for negative streams which caused long start up times. Introduced in [\#8374](matrix-org/synapse#8374). ([\#8447](matrix-org/synapse#8447))


Synapse 1.21.0rc1 (2020-10-01)
==============================

Features
--------

- Require the user to confirm that their password should be reset after clicking the email confirmation link. ([\#8004](matrix-org/synapse#8004))
- Add an admin API `GET /_synapse/admin/v1/event_reports` to read entries of table `event_reports`. Contributed by @dklimpel. ([\#8217](matrix-org/synapse#8217))
- Consolidate the SSO error template across all configuration. ([\#8248](matrix-org/synapse#8248), [\#8405](matrix-org/synapse#8405))
- Add a configuration option to specify a whitelist of domains that a user can be redirected to after validating their email or phone number. ([\#8275](matrix-org/synapse#8275), [\#8417](matrix-org/synapse#8417))
- Add experimental support for sharding event persister. ([\#8294](matrix-org/synapse#8294), [\#8387](matrix-org/synapse#8387), [\#8396](matrix-org/synapse#8396), [\#8419](matrix-org/synapse#8419))
- Add the room topic and avatar to the room details admin API. ([\#8305](matrix-org/synapse#8305))
- Add an admin API for querying rooms where a user is a member. Contributed by @dklimpel. ([\#8306](matrix-org/synapse#8306))
- Add `uk.half-shot.msc2778.login.application_service` login type to allow appservices to login. ([\#8320](matrix-org/synapse#8320))
- Add a configuration option that allows existing users to log in with OpenID Connect. Contributed by @BBBSnowball and @OmmyZhang. ([\#8345](matrix-org/synapse#8345))
- Add prometheus metrics for replication requests. ([\#8406](matrix-org/synapse#8406))
- Support passing additional single sign-on parameters to the client. ([\#8413](matrix-org/synapse#8413))
- Add experimental reporting of metrics on expensive rooms for state-resolution. ([\#8420](matrix-org/synapse#8420))
- Add experimental prometheus metric to track numbers of "large" rooms for state resolutiom. ([\#8425](matrix-org/synapse#8425))
- Add prometheus metrics to track federation delays. ([\#8430](matrix-org/synapse#8430))


Bugfixes
--------

- Fix a bug in the media repository where remote thumbnails with the same size but different crop methods would overwrite each other. Contributed by @deepbluev7. ([\#7124](matrix-org/synapse#7124))
- Fix inconsistent handling of non-existent push rules, and stop tracking the `enabled` state of removed push rules. ([\#7796](matrix-org/synapse#7796))
- Fix a longstanding bug when storing a media file with an empty `upload_name`. ([\#7905](matrix-org/synapse#7905))
- Fix messages not being sent over federation until an event is sent into the same room. ([\#8230](matrix-org/synapse#8230), [\#8247](matrix-org/synapse#8247), [\#8258](matrix-org/synapse#8258), [\#8272](matrix-org/synapse#8272), [\#8322](matrix-org/synapse#8322))
- Fix a longstanding bug where files that could not be thumbnailed would result in an Internal Server Error. ([\#8236](matrix-org/synapse#8236), [\#8435](matrix-org/synapse#8435))
- Upgrade minimum version of `canonicaljson` to version 1.4.0, to fix an unicode encoding issue. ([\#8262](matrix-org/synapse#8262))
- Fix longstanding bug which could lead to incomplete database upgrades on SQLite. ([\#8265](matrix-org/synapse#8265))
- Fix stack overflow when stderr is redirected to the logging system, and the logging system encounters an error. ([\#8268](matrix-org/synapse#8268))
- Fix a bug which cause the logging system to report errors, if `DEBUG` was enabled and no `context` filter was applied. ([\#8278](matrix-org/synapse#8278))
- Fix edge case where push could get delayed for a user until a later event was pushed. ([\#8287](matrix-org/synapse#8287))
- Fix fetching malformed events from remote servers. ([\#8324](matrix-org/synapse#8324))
- Fix `UnboundLocalError` from occuring when appservices send a malformed register request. ([\#8329](matrix-org/synapse#8329))
- Don't send push notifications to expired user accounts. ([\#8353](matrix-org/synapse#8353))
- Fix a regression in v1.19.0 with reactivating users through the admin API. ([\#8362](matrix-org/synapse#8362))
- Fix a bug where during device registration the length of the device name wasn't limited. ([\#8364](matrix-org/synapse#8364))
- Include `guest_access` in the fields that are checked for null bytes when updating `room_stats_state`. Broke in v1.7.2. ([\#8373](matrix-org/synapse#8373))
- Fix theoretical race condition where events are not sent down `/sync` if the synchrotron worker is restarted without restarting other workers. ([\#8374](matrix-org/synapse#8374))
- Fix a bug which could cause errors in rooms with malformed membership events, on servers using sqlite. ([\#8385](matrix-org/synapse#8385))
- Fix "Re-starting finished log context" warning when receiving an event we already had over federation. ([\#8398](matrix-org/synapse#8398))
- Fix incorrect handling of timeouts on outgoing HTTP requests. ([\#8400](matrix-org/synapse#8400))
- Fix a regression in v1.20.0 in the `synapse_port_db` script regarding the `ui_auth_sessions_ips` table. ([\#8410](matrix-org/synapse#8410))
- Remove unnecessary 3PID registration check when resetting password via an email address. Bug introduced in v0.34.0rc2. ([\#8414](matrix-org/synapse#8414))


Improved Documentation
----------------------

- Add `/_synapse/client` to the reverse proxy documentation. ([\#8227](matrix-org/synapse#8227))
- Add note to the reverse proxy settings documentation about disabling Apache's mod_security2. Contributed by Julian Fietkau (@jfietkau). ([\#8375](matrix-org/synapse#8375))
- Improve description of `server_name` config option in `homserver.yaml`. ([\#8415](matrix-org/synapse#8415))


Deprecations and Removals
-------------------------

- Drop support for `prometheus_client` older than 0.4.0. ([\#8426](matrix-org/synapse#8426))


Internal Changes
----------------

- Fix tests on distros which disable TLSv1.0. Contributed by @danc86. ([\#8208](matrix-org/synapse#8208))
- Simplify the distributor code to avoid unnecessary work. ([\#8216](matrix-org/synapse#8216))
- Remove the `populate_stats_process_rooms_2` background job and restore functionality to `populate_stats_process_rooms`. ([\#8243](matrix-org/synapse#8243))
- Clean up type hints for `PaginationConfig`. ([\#8250](matrix-org/synapse#8250), [\#8282](matrix-org/synapse#8282))
- Track the latest event for every destination and room for catch-up after federation outage. ([\#8256](matrix-org/synapse#8256))
- Fix non-user visible bug in implementation of `MultiWriterIdGenerator.get_current_token_for_writer`. ([\#8257](matrix-org/synapse#8257))
- Switch to the JSON implementation from the standard library. ([\#8259](matrix-org/synapse#8259))
- Add type hints to `synapse.util.async_helpers`. ([\#8260](matrix-org/synapse#8260))
- Simplify tests that mock asynchronous functions. ([\#8261](matrix-org/synapse#8261))
- Add type hints to `StreamToken` and `RoomStreamToken` classes. ([\#8279](matrix-org/synapse#8279))
- Change `StreamToken.room_key` to be a `RoomStreamToken` instance. ([\#8281](matrix-org/synapse#8281))
- Refactor notifier code to correctly use the max event stream position. ([\#8288](matrix-org/synapse#8288))
- Use slotted classes where possible. ([\#8296](matrix-org/synapse#8296))
- Support testing the local Synapse checkout against the [Complement homeserver test suite](https://github.com/matrix-org/complement/). ([\#8317](matrix-org/synapse#8317))
- Update outdated usages of `metaclass` to python 3 syntax. ([\#8326](matrix-org/synapse#8326))
- Move lint-related dependencies to package-extra field, update CONTRIBUTING.md to utilise this. ([\#8330](matrix-org/synapse#8330), [\#8377](matrix-org/synapse#8377))
- Use the `admin_patterns` helper in additional locations. ([\#8331](matrix-org/synapse#8331))
- Fix test logging to allow braces in log output. ([\#8335](matrix-org/synapse#8335))
- Remove `__future__` imports related to Python 2 compatibility. ([\#8337](matrix-org/synapse#8337))
- Simplify `super()` calls to Python 3 syntax. ([\#8344](matrix-org/synapse#8344))
- Fix bad merge from `release-v1.20.0` branch to `develop`. ([\#8354](matrix-org/synapse#8354))
- Factor out a `_send_dummy_event_for_room` method. ([\#8370](matrix-org/synapse#8370))
- Improve logging of state resolution. ([\#8371](matrix-org/synapse#8371))
- Add type annotations to `SimpleHttpClient`. ([\#8372](matrix-org/synapse#8372))
- Refactor ID generators to use `async with` syntax. ([\#8383](matrix-org/synapse#8383))
- Add `EventStreamPosition` type. ([\#8388](matrix-org/synapse#8388))
- Create a mechanism for marking tests "logcontext clean". ([\#8399](matrix-org/synapse#8399))
- A pair of tiny cleanups in the federation request code. ([\#8401](matrix-org/synapse#8401))
- Add checks on startup that PostgreSQL sequences are consistent with their associated tables. ([\#8402](matrix-org/synapse#8402))
- Do not include appservice users when calculating the total MAU for a server. ([\#8404](matrix-org/synapse#8404))
- Typing fixes for `synapse.handlers.federation`. ([\#8422](matrix-org/synapse#8422))
- Various refactors to simplify stream token handling. ([\#8423](matrix-org/synapse#8423))
- Make stream token serializing/deserializing async. ([\#8427](matrix-org/synapse#8427))
Sign up for free to subscribe to this conversation on GitHub. Already have an account? Sign in.
Labels
None yet
Projects
None yet
Development

Successfully merging this pull request may close these issues.

None yet

2 participants