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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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Labs

Path Info

Level
Clock icon Intermediate
Duration
Clock icon 30m
Published
Clock icon Mar 06, 2020

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Table of Contents

  1. 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

  2. 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]"

  3. 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/

  4. 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
A Cloud Guru - Labs - Design an Email Notification on User Login via SSH
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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