systemcheck Hardening
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systemcheck attack surface reduction.
Rationale[edit]
Although systemcheck already has AppArmor and systemd hardening, some marginal security benefits are gained by reducing: the number of network connections, the amount of code running, and unnecessary functionality. This is not the default configuration, since that would come at the cost of decreased usability for the entire Kicksecure population.
Hardening Steps[edit]
Prevent Autostart[edit]
To prevent systemcheck from automatically starting, run.
sudo systemctl mask systemcheck
Prevent Kicksecure Warrant Canary Check and User Census Counting[edit]
Refer to the following systemcheck chapters:
Prevent Polluting TransPort[edit]
- This is only useful when running
systemcheck --leak-tests. However, running this command with the TorTransPorttest disabled makes little sense; in that case it would be useful as a TorSocksPortconnectivity test.
Deactivate the TransPort Test for better Stream Isolation.
Open file /etc/systemcheck.d/50_user.conf in an editor with root rights.
Kicksecure
This box uses sudoedit for better security.
Kicksecure for Qubes
NOTE: When using Kicksecure for Qubes, this needs to be done inside the Template.
Others and Alternatives
- This is just an example. Other tools could achieve the same goal.
- If this example does not work for you or if you are not using Kicksecure, please refer to this link.
sudoedit /etc/systemcheck.d/50_user.conf
Add the following content.
SYSTEMCHECK_DISABLE_TRANS_PORT_TEST="1"
Save.
Prevent Running APT[edit]
Complete these steps on both Kicksecure and Kicksecure.
This prevents the running of APT by systemcheck.
Open file /etc/systemcheck.d/50_user.conf in an editor with root rights.
Kicksecure
This box uses sudoedit for better security.
Kicksecure for Qubes
NOTE: When using Kicksecure for Qubes, this needs to be done inside the Template.
Others and Alternatives
- This is just an example. Other tools could achieve the same goal.
- If this example does not work for you or if you are not using Kicksecure, please refer to this link.
sudoedit /etc/systemcheck.d/50_user.conf
Add the following content.
systemcheck_skip_functions+=" check_operating_system "
Prevent torproject.org Connections[edit]
Connections to The Tor Project are prevented by default, therefore no action is required.
systemcheck only connects to torproject.org if the command systemcheck --leak-tests is manually run.
Footnotes[edit]
Unfinished: This wiki is a work in progress. Please do not report broken links until this notice is removed, use Search Engines First and contribute improving this wiki.
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