a simple notifier, using pushover
to configure, add a line similar to the following at the bottom of /etc/pam.d/sshd
session optional pam_exec.so seteuid /etc/ssh/sshd_notify.py
and create a config file in the same directory
$ cat /etc/ssh/pushover.ini
[pushover.net]
userkey = <KEY>
apikey = <KEY>
ignore_users = <list,of,users,to,ignore>