How to achieve E-Mail Notification on root login?

Zyumbilev, Peter peter at
Tue Feb 12 14:41:51 UTC 2013


Allow "sudo bash" only.

Modify .bashrc to mail last entry from the log

So you will get alert instantly :-)


On 12/02/2013 16:31, Robert Huff wrote:
> Polytropon writes:
>>  > given there is a FreeBSD system with users in the wheel group, 
>>  > what is the best practise to send out a notification
>>  > via E-Mail if one of them becomes root via su? In an ideal
>>  > case the E-Mail would contain the user name and the time.
>>  I'm not sure if there already is a solution (provided in the
>>  base system) that offers this functionality, but the fact of
>>  a user having used "su" to "su root" is logged by the system.
>>  The line is appended to /var/log/messages:
>>  	Feb 12 14:40:57 r56 su: poly to root on /dev/pts/2
>>  The information you want is in there, and you could either use
>>  the whole line, or apply some sed, awk or even perl to form a
>>  message with less information (only date and user).
>>  A scripted solution could monitor /var/log/messages for changes
>>  and use the system's builtin mailer to deliver the message. Tools
>>  like "tail -f", "grep" and "| mail" could be involved. It should
>>  be quite trivial to implement this and add a custom rc.d-style
>>  script (or even few lines in ye olde /etc/rc.local).
> 	Take a look at the "-p" option of "split".
> 	The bigger question is how quickly do you need to know -
> instantly?  once an hour?  once a day?  
> 				Robert Huff
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