creating alert for unauthorize login and command fired

kaushalender

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I am sorry if I am asking a very silly question but I am very new to security. Currently, I have a couple of requirement
1)Giving different level of access to a user on a Linux host like
L1 - Read-only who can only view the logs and configuration file
L2- With a restricted command like he can not delete any files
SME - Who can modify files Super user --- equal to root user
  1. if L1/L2 try to run an unauthorized command then one alert should be generated via email
3)If any configuration changes happen then one alert should be generated
How I can achieve these scenarios. Kindly help
Thanks in advance
Kaushal
 
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