Current SSH connection properties (cipher, auth type, timeout, etc)

Question

After a connection is established with SSH, how we can get the current connection properties ?

Is there a way to know what cipher(s) is being used ? Properties of the authentication ? Protocol version, timeouts and so on.

No, but you can find out more than you ever wanted to know about the connection when the handshake is negotiated, by passing 1 to 3 -v arguments to ssh. — Satō Katsura, Jul 8, 2016 at 18:18
Yeah! I Know that, but I would like to get some info, in the current connection (already established) — Luciano, Jul 8, 2016 at 18:24
Feel free to ask the OpenSSH guys to implement it. Perhaps something like pkill -INFO ssh make it print status, modeled after dd. They might see a value to it. — Satō Katsura, Jul 8, 2016 at 18:32

erroia · Accepted Answer · 2016-07-11 20:04:26Z

1

you can enable verbose more logging for sshd:

sudo nano /etc/ssh/sshd_config

add line

LogLevel   VERBOSE

and restart sshd

sudo systemctl restart ssh

view log entry

journalctl -u sshd |tail -100

answered Jul 11, 2016 at 20:04

erroia

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