matrix: quick writeup on m.room.tombstone

I find it an infrequently asked question where finding the answer is a
pain, so this asssures it's historically storen somewhere I can find it
on demand.
This commit is contained in:
Aminda Suomalainen 2022-02-17 13:13:05 +02:00
parent 1cb1f5cdd0
commit 0d32bda9da
Signed by: Mikaela
SSH Key Fingerprint: SHA256:CXLULpqNBdUKB6E6fLA1b/4SzG0HvKD19PbIePU175Q

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# On Matrix tombstones
I am not putting the events here as I have [scripts for that separately](https://gitea.blesmrt.net/mikaela/scripts/src/branch/master/bash).
## PL50 tombstoning
Synapse versions before [1.11.0 (2020-02-21), technically 1.11.0rc1 (2020-02-19)](https://github.com/matrix-org/synapse/releases/tag/v1.11.0)
allowed power level 50 to set tombstones and thus hijack rooms. Thus this is
dependent on the Synapse version used at the time of room creation.
* [PR](https://github.com/matrix-org/synapse/pull/6834)
* [commit](https://github.com/matrix-org/synapse/commit/3404ad289b1d2e5bc5c7f277f519b9698dbdaa15)
In the same context invites were changed to require PL50 by default, and ACL
also got the requirement for PL100.