67 lines
2.4 KiB
Nix
67 lines
2.4 KiB
Nix
{
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pkgs,
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config,
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lib,
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...
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}:
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with lib; let
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cfg = config.security.extensive;
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in {
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options = {
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security.extensive.enable =
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mkEnableOption "enable extensive security";
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};
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config = mkIf cfg.enable {
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security.basic.enable = true;
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environment.memoryAllocator.provider = mkDefault "scudo";
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environment.variables.SCUDO_OPTIONS = mkDefault "ZeroContents=1";
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security = {
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lockKernelModules = mkDefault false;
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protectKernelImage = mkDefault true;
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# allowSimultaneousMultithreading = mkDefault false;
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forcePageTableIsolation = mkDefault true;
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unprivilegedUsernsClone = mkDefault config.virtualisation.containers.enable;
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virtualisation.flushL1DataCache = mkDefault "always";
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apparmor.enable = mkDefault true;
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apparmor.killUnconfinedConfinables = mkDefault true;
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};
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boot.kernel.sysctl = {
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# Hide kptrs even for processes with CAP_SYSLOG
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"kernel.kptr_restrict" = mkOverride 500 2;
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# Disable bpf() JIT (to eliminate spray attacks)
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"net.core.bpf_jit_enable" = mkDefault false;
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# Disable ftrace debugging
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"kernel.ftrace_enabled" = mkDefault false;
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};
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boot.kernel.sysctl = {
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# Enable strict reverse path filtering (that is, do not attempt to route
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# packets that "obviously" do not belong to the iface's network; dropped
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# packets are logged as martians).
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"net.ipv4.conf.all.log_martians" = mkDefault true;
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"net.ipv4.conf.all.rp_filter" = mkDefault "1";
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"net.ipv4.conf.default.log_martians" = mkDefault true;
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"net.ipv4.conf.default.rp_filter" = mkDefault "1";
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# Ignore broadcast ICMP (mitigate SMURF)
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"net.ipv4.icmp_echo_ignore_broadcasts" = mkDefault true;
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# Ignore incoming ICMP redirects (note: default is needed to ensure that the
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# setting is applied to interfaces added after the sysctls are set)
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"net.ipv4.conf.all.accept_redirects" = mkDefault false;
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"net.ipv4.conf.all.secure_redirects" = mkDefault false;
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"net.ipv4.conf.default.accept_redirects" = mkDefault false;
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"net.ipv4.conf.default.secure_redirects" = mkDefault false;
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"net.ipv6.conf.all.accept_redirects" = mkDefault false;
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"net.ipv6.conf.default.accept_redirects" = mkDefault false;
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# Ignore outgoing ICMP redirects (this is ipv4 only)
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"net.ipv4.conf.all.send_redirects" = mkDefault false;
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"net.ipv4.conf.default.send_redirects" = mkDefault false;
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};
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};
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}
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