Notify whenever someone logs in via SSH

notify-ssh.sh

#!/bin/bash
# https://cmaster11.medium.com/how-to-get-notified-whenever-someone-logs-in-via-ssh-947a8f8d4f37
# Edit the /etc/pam.d/sshd file and append the following line at the end:
# session [default=ignore] pam_exec.so /bin/bash /opt/notify-ssh.sh

# We want to trigger the script only when the SSH session starts.
# To be notified also when session closes, you can watch for
# the "close_session" value.
if [[ "$PAM_TYPE" != "open_session" ]]; then
        exit 0
fi

read -r -d '' CONTENT <<-EOF || true
Now UTC: $(date --utc "+%F %T")
Env:
$(printenv)
EOF


curl -X POST --data-urlencode \
        'payload={"channel": "#channel", "text": "SSH: User logged in"}' \
        https://hooks.slack.com/services///