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I want to make a log to detect the nature of intrusions into my Unix/Linux based server.

For that I want to learn some tools like Open Source Tripwire and OSSEC. Please suggest to me similar tools.

What kind of info can I get about the intruder from the tools of this kind? Can I automate the process of keeping track of the alerts generated by these tools in a file?

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  • Keep in mind that these tools won't detect rootkits, except really badly written ones. Rootkits hide. – Gilles 'SO- stop being evil' May 16 '16 at 23:22
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  • If your system uses rpms: rpm -q --verify for package content
  • For config files: use etckeeper or puppet to store them

iirc ossec can use both of these to complement its own functions.

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A good auditing tools that is much easier than Tripwire to configure is called Aide. It can be found here. You might be able to get it from your distro specific repo.

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