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Good find! I was always curious how this worked.
I'm a big fan of tools like secretive[1] that can help solve this problem by using biometrics to shift the UX/security trade-off and thus make it feasible to always require some kind of authentication to sign a token with a key.
I'm not aware of any tools that do the same for Linux, and a quick Google search doesn't turn up much[2]. It does look like you can at least get a notification[3], though.
This could provide another layer of protection on the user's endpoint device in addition the network monitoring called out in the article. Defense in depth, and all that.
[1] https://github.com/maxgoedjen/secretive
[2] https://unix.stackexchange.com/questions/705144/unlock-an-ss...
[3] https://www.insecure.ws/2013/09/25/ssh-agent-notification.ht...