[v16] prevent session id reuse#42133
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capnspacehook merged 2 commits intobranch/v16from May 30, 2024
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If a user sets `TELEPORT_SESSION` to a session ID that isn't running, the sent session ID is ignored and a new one is used to prevent the user controlling the value. When parsing a session ID the parsed result is used to ensure all session IDs will have the same format. `CreateSessionTracker` is updated to create instead of upsert to ensure `SessionTracker` resources cannot be overwritten by accident. Clients often need to know the current session ID, and before when they were in control of it that wasn't an issue. To fix this servers will send the current session ID in a SSH channel request on the channel the SSH session was created on. This should be fully backwards compatible, as when an unknown SSH request type is received clients will just ignore it/reply with false.
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Backport #42123 to branch/v16
changelog: fix session recordings getting overwritten or not uploaded