[v11] Reduce time spent setting ssh session envs #23833
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`tsh` sets a number of environment variables when setting up the users session. Each key value pair is transmitted one at a time in a "env" ssh request, which adds a num envs * RTT of additional latency per session. This introduces a new `envs@goteleport.com` request which sets multiple environment variables in a single ssh request, which reduces the amount of time spent setting envs down to the RTT of a single ssh request. In order to ensure backward compat and interoperability with OpenSSH, if the server does not recognize the `envs@goteleport.com` request the ssh client will resort to sending individual "env" requests.
Co-authored-by: Alan Parra <alan.parra@goteleport.com>
Co-authored-by: Alan Parra <alan.parra@goteleport.com>
codingllama
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Mar 30, 2023
marcoandredinis
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marcoandredinis
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rosstimothy
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Mar 31, 2023
Because unknown session requests abort sessions instead of getting rejected "envs@goteleport.com" breaks backwards compatability.
rosstimothy
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Mar 31, 2023
* Prevent unknown ssh requests from terminating sessions Instead of returning and aborting a session if an unknown request is received servers now log the warning and continue on. * Revert part of #23833 Because unknown session requests abort sessions instead of getting rejected "envs@goteleport.com" breaks backwards compatability.
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Backport #23731 branch/v11