Lab
A Cloud Guru

Design an Email Notification on User Login via SSH

The topic of this lab is notifications. The goal is to design a notification system that will send a notification by email every time a user logs in via SSH. This is a good way to notify us of malicious activity.

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Path Info

Level

Intermediate

Duration

30m

Published

Mar 06, 2020

Challenge

Install EPEL Repos, sendemail, python36, python36-devel

sudo yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

sudo yum install python36 python36-devel

sudo yum install sendemail

Challenge

Test Sending out an Email

sendemail -f [FROM_EMAIL] -u 'AUTH_NOTIFICATION' -t [TO_EMAIL] -s smtp.gmail.com:587 -o tls=yes -xu [USER_NAME] -xp [PASSWORD] -m "[YOUR MESSAGE]"

Challenge

Write a Script to Send an Email with the Time Stamp and Username upon SSH Login

vim /home/cloud_user/onLogin.py

#!/bin/python3.6

import subprocess
from datetime import datetime
import time
import getpass

msg = "#########################\nTIME: " + datetime.now().strftime('%Y-%m-%d %H:%M:%S') + "\nUSER: " + getpass.getuser() + "\nWAS AUTHENTICATED\n#########################\n"

subprocess.check_output(['sendemail', '-f', '[FROM_EMAIL]', '-u', 'SCAN_NOTIFICATION', '-t', '[TO_EMAIL]', '-s', 'smtp.gmail.com:587', '-o', 'tls=yes', '-xu', '[USER_NAME]', '-xp', '[PASSWORD]', '-m', msg], stdin=None, stderr=None, shell=False, universal_newlines=False)

ESC
:wq
ENTER

chmod +x /home/cloud_user/onLogin.py

sudo cp /home/cloud_user/onLogin.py /bin/

Challenge

Configure SSH to Make Use of the Script

sudo vim /etc/pam.d/sshd

session optional pam_exec.so seteuid /bin/onSSHLoginHook.py

ESC
:wq
ENTER

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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