Be more paranoid
The paranoia mode now also enables the firewall and closes down a couple of small openSSH holes. `noexec` on the whole FS is left out as it will make every existing PubSolarOS installation panic.
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@ -36,6 +36,8 @@ in
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wifi.backend = "iwd";
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};
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networking.firewall.enable = true;
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# Customized binary caches list (with fallback to official binary cache)
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nix.binaryCaches = cfg.binaryCaches;
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nix.binaryCachePublicKeys = cfg.publicKeys;
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@ -21,5 +21,35 @@ in
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config = mkIf cfg.enable {
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pub-solar.core.hibernation.enable = true;
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services.logind.lidSwitch = "hibernate";
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# The options below are directly taken from or inspired by
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# https://xeiaso.net/blog/paranoid-nixos-2021-07-18
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# Don't set this if you need sftp
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services.openssh.allowSFTP = false;
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services.openssh.openFirewall = false; # Lock yourself out
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# Limit the use of sudo to the group wheel
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security.sudo.execWheelOnly = true;
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# Remove the complete default environment of packages like
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# nano, perl and rsync
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environment.defaultPackages = lib.mkForce [ ];
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# fileSystems."/".options = [ "noexec" ];
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services.openssh = {
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enable = true;
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openFirewall = false;
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passwordAuthentication = false;
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kbdInteractiveAuthentication = false;
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extraConfig = ''
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AllowTcpForwarding yes
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X11Forwarding no
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AllowAgentForwarding no
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AllowStreamLocalForwarding no
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AuthenticationMethods publickey
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'';
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};
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};
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}
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