What information can be gathered about remote host on ssh login

Question

I want to map users (that ssh to server) to emails. In csh you have defined $REMOTEHOST variable that contains PC name from remote host. In bash, no environment variable is defined. Is there any way to get some info about connected user (except from SSH_CLIENT which gives IP and PORT)

Note that I'm using sshd and bash.

Answer 1

No. The only information you can obtain are user, host and port.

You can simply grep the auth.log for ssh sessions.

$ grep sshd /var/log/auth.log | grep Accepted
Sep 11 12:53:54 lenny sshd[2686]: Accepted password for cb from 127.0.0.1 port 33343 ssh2

I guess you can map usernames to email addresses.

You can simply add a command to /etc/ssh/sshrc which uses the $USER variable ;) E.g.

#!/bin/bash 
echo $USER
echo $SSH_CLIENT