91 lines
2.4 KiB
Nix
91 lines
2.4 KiB
Nix
{ config, lib, options, pkgs, ... }:
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with lib;
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let
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cfg = config.modules.security;
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in {
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options.modules.security = {
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isLocalMachine = mkOption {
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type = types.bool;
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default = null;
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description = "We can make some security tweaks depending on whether or not the machine is local.";
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};
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tmpOnTmpfs = mkOption {
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type = types.bool;
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default = true;
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};
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cleanTmpDir = mkOption {
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type = types.bool;
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default = !cfg.tmpOnTmpfs;
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};
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allowedUDPPorts = mkOption {
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type = types.listOf types.port;
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default = [ ];
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};
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allowedTCPPorts = mkOption {
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type = types.listOf types.port;
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default = [ ];
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};
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};
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config = {
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assertions = [
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{ assertion = cfg.isLocalMachine != null;
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description = "The isLocalMachine property *must* be explicitly specified.";
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}
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];
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boot.tmp.useTmpfs = lib.mkDefault true;
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boot.tmp.cleanOnBoot = lib.mkDefault (!config.boot.tmp.useTmpfs);
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security.rtkit.enable = true;
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boot.loader.systemd-boot.editor = false;
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networking.firewall = {
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enable = true;
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allowedUDPPorts = cfg.allowedUDPPorts;
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allowedTCPPorts = cfg.allowedTCPPorts;
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};
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security.sudo.enable = false;
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security.doas = {
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enable = true;
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extraRules = if cfg.isLocalMachine then [{ users = builtins.attrNames config.defaultUsers; keepEnv = true; noPass = true; }] else [];
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};
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boot.kernel.sysctl = {
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"kernel.sysrq" = 0;
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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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"net.ipv4.conf.all.accept_source_code" = 0;
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"net.ipv6.conf.all.accept_source_code" = 0;
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"net.ipv4.conf.default.send_redirects" = 0;
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"net.ipv4.conf.all.send_redirects" = 0;
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"net.ipv4.conf.default.accept_redirects" = 0;
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"net.ipv4.conf.all.accept_redirects" = 0;
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"net.ipv6.conf.default.accept_redirects" = 0;
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"net.ipv6.conf.all.accept_redirects" = 0;
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"net.ipv4.conf.default.secure_redirects" = 0;
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"net.ipv4.conf.all.secure_redirects" = 0;
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"net.ipv4.tcp_syncookies" = 1;
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"net.ipv4.tcp_rfc1337" = 1;
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"net.ipv4.tcp_fastopen" = 3;
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"net.ipv4.tcp_conjestion_control" = "bbr";
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"net.core.default_qdisc" = "cake";
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};
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user = {
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initialPassword = "nixos";
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};
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users.users.root = {
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packages = [ pkgs.shadow ];
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shell = pkgs.shadow;
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hashedPassword = "!";
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};
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};
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}
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