[Bug 3230] New: Cannot cancel security key user presence check.

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3230

            Bug ID: 3230
           Summary: Cannot cancel security key user presence check.
           Product: Portable OpenSSH
           Version: 8.4p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh-agent
          Assignee: unassigned-bugs at mindrot.org
          Reporter: jordanp at gmail.com

I ran ssh to connect to a server, and realized it wasn't the one I
wanted.  Clicking cancel in the ssh-askpass dialog closes it, but
leaves the ssh command waiting to connect.  In ps, I see the defunct
ssh-askpass command and ssh-sk-helper running.

Killing the ssh command still leaves ssh-sk-helper running.  Any new
connections using a security key will not get the prompt until I touch
the key, which allows the previous ssh-sk-helper instance to finish. 
Or I can kill it instead of touching the key.

Would it be possible for the agent to cancel the authentication attempt
when the cancel button in the ssh-askpass program is pressed?

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