100 lines
3.2 KiB
Nix
100 lines
3.2 KiB
Nix
{ lib, config, pkgs, ... }:
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let
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cfg = config.systemModules.security;
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in
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{
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config = lib.mkIf cfg.enable {
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environment.systemPackages = with pkgs; [
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polkit_gnome
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];
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programs = {
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gnupg.agent = {
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enable = true;
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enableSSHSupport = true;
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};
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_1password = {
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enable = true;
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};
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_1password-gui = {
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enable = true;
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polkitPolicyOwners = [ "ooks" ];
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};
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};
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security = {
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polkit = {
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enable = true;
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};
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pam.services = { swaylock = { }; };
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sudo = {
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enable = true;
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wheelNeedsPassword = false;
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};
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rtkit.enable = true;
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};
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# security tweaks borrowed from @hlissner
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boot.kernel.sysctl = {
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# The Magic SysRq key is a key combo that allows users connected to the
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# system console of a Linux kernel to perform some low-level commands.
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# Disable it, since we don't need it, and is a potential security concern.
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"kernel.sysrq" = 0;
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## TCP hardening
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# Prevent bogus ICMP errors from filling up logs.
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"net.ipv4.icmp_ignore_bogus_error_responses" = 1;
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# Reverse path filtering causes the kernel to do source validation of
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# packets received from all interfaces. This can mitigate IP spoofing.
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"net.ipv4.conf.default.rp_filter" = 1;
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"net.ipv4.conf.all.rp_filter" = 1;
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# Do not accept IP source route packets (we're not a router)
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"net.ipv4.conf.all.accept_source_route" = 0;
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"net.ipv6.conf.all.accept_source_route" = 0;
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# Don't send ICMP redirects (again, we're not a router)
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"net.ipv4.conf.all.send_redirects" = 0;
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"net.ipv4.conf.default.send_redirects" = 0;
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# Refuse ICMP redirects (MITM mitigations)
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"net.ipv4.conf.all.accept_redirects" = 0;
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"net.ipv4.conf.default.accept_redirects" = 0;
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"net.ipv4.conf.all.secure_redirects" = 0;
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"net.ipv4.conf.default.secure_redirects" = 0;
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"net.ipv6.conf.all.accept_redirects" = 0;
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"net.ipv6.conf.default.accept_redirects" = 0;
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# Protects against SYN flood attacks
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"net.ipv4.tcp_syncookies" = 1;
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# Incomplete protection again TIME-WAIT assassination
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"net.ipv4.tcp_rfc1337" = 1;
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## TCP optimization
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# TCP Fast Open is a TCP extension that reduces network latency by packing
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# data in the sender’s initial TCP SYN. Setting 3 = enable TCP Fast Open for
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# both incoming and outgoing connections:
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"net.ipv4.tcp_fastopen" = 3;
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# Bufferbloat mitigations + slight improvement in throughput & latency
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"net.ipv4.tcp_congestion_control" = "bbr";
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"net.core.default_qdisc" = "cake";
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};
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boot.kernelModules = ["tcp_bbr"];
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systemd = {
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user.services.polkit-gnome-authentication-agent-1 = {
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description = "polkit-gnome-authentication-agent-1";
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wantedBy = [ "graphical-session.target" ];
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wants = [ "graphical-session.target" ];
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after = [ "graphical-session.target" ];
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serviceConfig = {
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Type = "simple";
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ExecStart = "${pkgs.polkit_gnome}/libexec/polkit-gnome-authentication-agent-1";
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Restart = "on-failure";
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RestartSec = 1;
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TimeoutStopSec = 10;
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};
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};
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};
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};
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}
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