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Set an email alert on SSH root login to your server
Want to be notified instantly when someone logs into your server as root? No problem, check out this nice tutorial on email notification for root logins. Keeping track of who logs into your server and when is very important, especially when you're dealing with the super user account. We recommend that you use an email address not hosted on the server your sending the alert from.
So lets get started!
1. Login to your server and su to root, I know the irony!
2. cd /root
3. pico .bashrc
4. Scroll to the end of the file then add the following:
echo 'ALERT - Root Shell Access (YourserverName) on:' `date` `who` | mail -s "Alert: Root Access from `who | cut -d"(" -f2 | cut -d")" -f1`" email@example.com
Replace YourServerName with the handle for your actual server
Replace firstname.lastname@example.org with your actual email address
5. Crtl + X then Y
Now logout of SSH, close the connection and log back in! You should receive an email address of the root login alert a few minutes afterwards.
Note: This is a great tool for servers that have multiple admins or if you give someone SSH access for whatever reason, although you should give out the root password to as few people as humanly possible and be sure to change it often.
This will not magically alert you when a hacker runs the latest kernel exploit on your server and logs into SSH because they will create their own SSH/telnet connection. You should keep your system up to date, install a firewall and follow the latest security releases.
Thanks to S. Leggett
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