Created
April 17, 2023 14:56
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| # This is a quick and dirty script that emails an admin about any new IP addresses found in the auth.log. | |
| # It includes the last 10 lines featuring a new IP along with output from ip-api.com. | |
| # It saves identified IPs in a text file to prevent repeat reporting. | |
| # Set this up to run as a cron job to be notified of any new networks authenticating on your Linux server. | |
| import sys | |
| import os | |
| import subprocess | |
| msg_filename = 'monitor_auth.msg' | |
| from_email = 'admin@domain.com' | |
| to_email = from_email | |
| # Create known_ips.txt if needed | |
| if not os.path.isfile('known_ips.txt'): | |
| subprocess.run("touch known_ips.txt", shell=True) | |
| # Collect known IPs | |
| known_ips = [] | |
| with open('known_ips.txt') as f: | |
| lines = f.readlines() | |
| for line in lines: | |
| ip = line.strip() | |
| if not ip in known_ips: | |
| known_ips.append(ip) | |
| # Process any new IPs | |
| result = subprocess.run("grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' /var/log/auth.log", shell=True, capture_output=True, text=True) | |
| ips = result.stdout.strip().split("\n") | |
| msg = '' | |
| for ip in ips: | |
| if not ip in known_ips: | |
| print(ip) | |
| result = subprocess.run("grep " + ip + " /var/log/auth.log", shell=True, capture_output=True, text=True) | |
| last10 = result.stdout.strip().split("\n")[-10:] | |
| result = subprocess.run("curl http://ip-api.com/json/" + ip, shell=True, capture_output=True, text=True) | |
| info = result.stdout.strip() | |
| msg += '= ' + ip + ' =\n' | |
| msg += '\n'.join(last10) + '\n' | |
| msg += info + '\n\n' | |
| known_ips.append(ip) | |
| # Send alert message | |
| if msg != '': | |
| with open(msg_filename,'w') as f: | |
| f.write(msg) | |
| subprocess.run('mail -r ' + from_email + ' -s "New IPs Found" ' + to_email + ' < ' + msg_filename, shell=True) | |
| os.remove(msg_filename) | |
| # Save known IPs | |
| with open('known_ips.txt', 'w') as f: | |
| for ip in known_ips: | |
| f.write(ip + '\n') |
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