Security

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Revision as of 14:39, 8 November 2020 by Slughorn (Talk | contribs) (Introduction)

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Welcome to theIcon Disti GhostBSD.png Security


Introduction

On this page we will collect information to harden your system.

To check your security you can use Lynis security scan.

Firstly, install lynis:

sudo pkg install lynis


Secondly, conduct an audit:

sudo lynis audit system


Hardening your system to receive a better Hardened Index score is trivial.

How to harden your system

To have GhostBSD score a 70 on the audit. Install rkhunter and change 4 settings.

Photo 2020-11-08 12-40-56.jpg

You can make additional changes to improve the score. Feel free to test to see what is comfortable for you.

Photo 2020-11-08 12-44-00.jpg


If we simply set the network related values, we will not affect the user experience.

Photo 2020-11-08 12-57-52.jpg

These changes plus adding one pkg (rkhunter) will provide a score of 77.


However, it is possible to attain a score of 82 by enabling several additional security.bsd settings.

Photo 2020-11-08 13-13-23.jpg

For those that want to have these changes be persistent after reboot, add them to /etc/sysctl.conf.

Also, if you do not want to use rkhunter, it is possible to replace it with clamav. Both rkhunter and clamav help to raise the hardened index score.

How could keep those change - How setting security

Append /etc/sysctl.conf with these entries:

   hw.kbd.keymap_restrict_change=4
   kern.sugid_coredump=0
   net.inet.icmp.bmcastecho=0
   net.inet.icmp.drop_redirect=1
   net.inet.ip.accept_sourceroute=0
   net.inet.ip.check_interface=1
   net.inet.ip.forwarding=0
   net.inet.ip.process_options=0
   net.inet.ip.random_id=1
   net.inet.ip.redirect=0
   net.inet.ip.sourceroute=0
   net.inet.tcp.always_keepalive=0
   net.inet.tcp.blackhole=2
   net.inet.tcp.drop_synfin=1
   net.inet.tcp.icmp_may_rst=0
   net.inet.tcp.nolocaltimewait=1
   net.inet.tcp.path_mtu_discovery=0
   net.inet.udp.blackhole=1
   net.inet6.icmp6.rediraccept=0
   net.inet6.ip6.forwarding=0
   net.inet6.ip6.fw.enable=1
   net.inet6.ip6.redirect=0
   # The settings below will change the user experience
   security.bsd.hardlink_check_gid=1
   security.bsd.hardlink_check_uid=1
   security.bsd.see_other_gids=0
   security.bsd.see_other_uids=0
   security.bsd.stack_guard_page=1
   security.bsd.unprivileged_proc_debug=0
   security.bsd.unprivileged_read_msgbuf=0

Additional Information


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