anonymousland-synapse/synapse/storage
David Robertson 4f00432ce1
Fix potential leak of per-room profiles when the user dir is rebuilt. (#10981)
There are two steps to rebuilding the user directory:

1. a scan over rooms, followed by
2. a scan over local users.

The former reads avatars and display names from the `room_memberships`
table and therefore contains potentially private avatars and
display names. The latter reads from the the `profiles` table which only
contains public data; moreover it will overwrite any private profiles
that the rooms scan may have written to the user directory. This means
that the rebuild could leak private user while the rebuild was in
progress, only to later cover up the leaks once the rebuild had completed.

This change skips over local users when writing user_directory rows
when scanning rooms. Doing so means that it'll take longer for a rebuild
to make local users searchable, which is unfortunate. I think a future
PR can improve this by swapping the order of the two steps above. (And
indeed there's more to do here, e.g. copying from `profiles` without
going via Python.)

Small tidy-ups while I'm here:

* Remove duplicated code from test_initial. This was meant to be pulled into `purge_and_rebuild_user_dir`.
* Move `is_public` before updating sharing tables. No functional change; it's still before the first read of `is_public`.
* Don't bother creating a set from dict keys. Slightly nicer and makes the code simpler.

Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
2021-10-05 18:35:25 +01:00
..
databases Fix potential leak of per-room profiles when the user dir is rebuilt. (#10981) 2021-10-05 18:35:25 +01:00
engines Fix the inbound PDU metric (#10279) 2021-06-30 12:07:16 +01:00
schema Drop backwards-compatibility support for "outlier" (#10903) 2021-09-28 15:25:36 +01:00
util Speed up MultiWriterIdGenerator when lots of IDs are in flight. (#10755) 2021-09-03 18:23:46 +01:00
__init__.py Remove redundant "coding: utf-8" lines (#9786) 2021-04-14 15:34:27 +01:00
_base.py Remove unnecessary SystemRandom from SQLBaseStore (#9987) 2021-05-14 10:59:10 +01:00
background_updates.py Use inline type hints in http/federation/, storage/ and util/ (#10381) 2021-07-15 12:46:54 -04:00
database.py Fix remove_stale_pushers job on SQLite. (#10843) 2021-09-20 10:26:13 +01:00
keys.py Remove redundant "coding: utf-8" lines (#9786) 2021-04-14 15:34:27 +01:00
persist_events.py Generics for ObservableDeferred (#10491) 2021-07-28 19:55:50 +00:00
prepare_database.py Use direct references for configuration variables (part 6). (#10916) 2021-09-29 06:44:15 -04:00
purge_events.py Remove redundant "coding: utf-8" lines (#9786) 2021-04-14 15:34:27 +01:00
push_rule.py Remove redundant "coding: utf-8" lines (#9786) 2021-04-14 15:34:27 +01:00
relations.py Name the type of token in "Invalid token" messages (#10815) 2021-09-14 11:25:05 +01:00
roommember.py Do not include rooms with an unknown room version in a sync response. (#10644) 2021-08-19 11:12:55 -04:00
state.py Add type hints to state database module. (#10823) 2021-09-15 09:54:13 -04:00
types.py Remove redundant "coding: utf-8" lines (#9786) 2021-04-14 15:34:27 +01:00