Add support for confirmation when an identity is used

[mgrrx]

OpenSSH's ssh-agent has the option to require confirmation when an identity is used. This is in particular useful when doing agent forwarding to a remote host.
Would it be possible to add this feature?

[Foxboron]

You are thinking about ssh-add -c, right?

[mgrrx]

Correct. There is also a setting (AddKeysToAgent) for the ssh client which would add keys to the agent when used. I suppose this is also done via the agent protocol. Support for both ways would be interesting in my opinion.

[Foxboron]

If you set IdentityFile to the public key I think AddKeysToAgent should just work?

[Foxboron]

-c has now been implemented here #114