This commit fixes a few issues with communities encryption:
Key distribution was disconnected from the community description, this created a case where the key would arrive after the community description and that would result in the client thinking that it was kicked.
To overcome this, we added a message that signals the user that is kicked. Also, we distribute the key with the community description so that there's no more issues with timing.
This is a bit expensive for large communities, and it will require some further optimizations.
Key distribution is now also connected to the request to join response, so there are no timing issues.
Fixes an issue with key distribution (race condition) where the community would be modified before being compared, resulting in a comparison of two identical communities, which would result in no key being distributed. This commit only partially address the issue.
This commit changes the format of the encryption id to be based off 3
things:
1) The group id
2) The timestamp
3) The actual key
Previously this was solely based on the timestamp and the group id, but
this might lead to conflicts. Moreover the format of the key was an
uint32 and so it would wrap periodically.
The migration is a bit tricky, so first we cleared the cache of keys,
that's easier than migrating, and second we set the new field hash_id to
the concatenation of group_id / key_id.
This might lead on some duplication in case keys are re-received, but it
should not have an impact on the correctness of the code.
I have added 2 tests covering compatibility between old/new clients, as
this should not be a breaking change.
It also adds a new message to rekey in a single go, instead of having to
send multiple messages
Andrea Maria Piana
Samuel Hawksby-Robinson