E-mail Alert on Root SSH Login Published: Dec 08, 2003
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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.

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`" you@yourdomain.com

Replace YourServerName with the handle for your actual server
Replace you@yourdomain.com 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.
  • Rating

    4/5

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Comments (16)

  • Gravatar - Edward
    Edward 07:05, December 9, 2003
    Loved it worked like a charm, but I had to make the entire code into one line instead of a 3 line code not sure why.
  • Gravatar - Chris
    Chris 22:34, December 19, 2003
    I am trying to do this but get a mail command not found when I login after doing this. cpanel/RH9

    Any ideas what I might be doing wrong?
  • Gravatar - C0NIk
    C0NIk 17:15, March 16, 2004
    it's cool one but sometime dont work with the Red Hat Entrprise 3

    so if it didnt work it will be easy to install LogWatch
  • Gravatar - Jimmy B Silva II
    Jimmy B Silva II 10:20, March 27, 2004
    Make sure you put in a single line like Edward did. It should work for Red Hat Enterprise 3
  • Gravatar - jad madi
    jad madi 15:46, May 20, 2004
    use echo -n for better
    so none will notice that there is a monitoring for login
  • Gravatar - JLChafardet
    JLChafardet 19:36, November 2, 2004
    It worked like charm on my RHEL ES3 box, will see if it sends mails every root try.<br />
    <br />
    any way it is most recomended that you forbid direct root logins.
  • Gravatar - Holoken
    Holoken 20:53, July 17, 2005
    If the attacker's clever then it won't work. Instead of logging in like Joe Admin would, he'll tell ssh to execute the following command: "ssh user@example.com /bin/bash --noprofile --norc". This'll bypass the mail-sending script in /root/.bashrc, and we'll be none the wiser.<br />
    <br />
    Put it instead in /root/.ssh/rc which is executed before any command (including any login shell) is run. This way the attacker's login will not go undetected even if he uses the above method to get in.<br />
  • Gravatar - Arif Kanji
    Arif Kanji 19:22, August 9, 2005
    Awesome!<br />
    How do u code to get alerts only for users who have entered incorrect username and/or password?<br />
    <br />
    Thanx
  • Gravatar - Clayton
    Clayton 21:40, October 23, 2005
    Hi,<br />
    I couldn't see .bashrc anywhere in my /root what should i do.<br />
    <br />
    Thanks<br />
    Regards,<br />
    CEO NightShells.NeT
  • Gravatar - BitSurFer
    BitSurFer 16:38, July 11, 2006
    somthing wrong!!<br />
    when i login i get this error<br />
    ----------------------------<br />
    cut: you must specify a list of bytes, characters, or fields<br />
    Try `cut --help' for more information.<br />
    -bash: -f1: command not found<br />
    ----------------------------
  • Gravatar - Dave
    Dave 16:55, March 15, 2007
    BitSurFer,<br />
    <br />
    Try replacing:<br />
    `who | cut -d"(" -f2 | cut -d")" -f1`<br />
    <br />
    with:<br />
    `whoami`<br />
    <br />
    It should do the same thing.<br />
  • Gravatar - JACOB
    JACOB 10:50, April 10, 2008
    I CAN'T SEE WHERE IT IS WRITTEN - "echo 'ALERT - Root Shell Access (YourserverName) on:' `date` `who` | mail -s "Alert: Root Access from `who | cut -d"(" -f2 | cut -d")" -f1`" you@yourdomain.com" <br />
    <br />
  • Gravatar - Phil
    Phil 17:29, May 15, 2008
    For FreeBSD users, edit the /root/.cshrc file and add the line as follows:<br />
    <br />
    echo 'ALERT - Root Shell Access on:' `date` `who` | mail -s "Alert: Root Access from `whoami`" yourname@your.email<br />
    <br />
    This should all be one line and should probably be added to the end of the file.<br />
    <br />
  • Gravatar - Paul Brady
    Paul Brady 21:11, September 9, 2008
    I can only get this tip to work if I enter:<br />
    # source .bash_profile<br />
    <br />
    to source the file. When I do that, I get an email. When I log out, however, and then log back in (using su) I get no alert by email.<br />
    Am I missing something? I've been banging my head on the wall for hours. Can someone help? :-)<br />
  • Gravatar - ubaid
    ubaid 00:49, September 23, 2008
    can we add the IP address of the machine whom we login or just like the message we get when we login to root user
  • Gravatar - ericinwisconsin
    ericinwisconsin 15:59, July 1, 2009
    An elegant solution, yes, but also prevent root from logging in at all. Add this line:<br />
    <br />
    AllowUsers <i>username</i><br />
    <br />
    to your sshd_config file.<br />
    <br />
    For us Debian (and probably Ubuntu) users, the file it at /etc/ssh/sshd_config<br />
    <br />
    You can issue an "su" command to become root. I NEVER allow root direct ssh access to a box, but I do also use the technique on this page to make sure. I also limit ssh access only from certain other boxes on important servers and routers.<br />

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