Tripwire

Install

You will set pass phrases ect during the package install.

sudo apt install tripwire

After install you have to initialize the database.

sudo tripwire --init

Then run a check, you will find some errors, fixing some of these requires editing the policy file.

sudo tripwire --check

after editing the policy file do this:

sudo twadmin -m P /etc/tripwire/twpol.txt

sudo tripwire --init

sudo tripwire --check

after editing the configuration file:

sudo twadmin --create-cfgfile -S /etc/tripwire/site.key /etc/tripwire/twcfg.txt

if the passwords arn't set up for whatever reason:

sudo dpkg-reconfigure tripwire

to update changes to your system the easy way:

sudo tripwire -m c -I

Reports and Logs

Tripwire reports are saved in /var/lib/tripwire/report/ and date stamped.

sudo ls /var/lib/tripwire/report/

References

https://www.howtoforge.com/tutorial/how-to-monitor-and-detect-modified-files-using-tripwire-on-ubuntu-1604
https://www.digitalocean.com/community/tutorials/how-to-use-tripwire-to-detect-server-intrusions-on-an-ubuntu-vps
https://www.techrepublic.com/article/example-2-a-sample-tripwire-policy-file/