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139 lines
3.6 KiB
Nix
139 lines
3.6 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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inherit (lib)
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concatStringsSep
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mkEnableOption mkIf mkOption types;
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cfg = config.services.https-dns-proxy;
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providers = {
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cloudflare = {
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ips = [ "1.1.1.1" "1.0.0.1" ];
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url = "https://cloudflare-dns.com/dns-query";
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};
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google = {
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ips = [ "8.8.8.8" "8.8.4.4" ];
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url = "https://dns.google/dns-query";
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};
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quad9 = {
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ips = [ "9.9.9.9" "149.112.112.112" ];
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url = "https://dns.quad9.net/dns-query";
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};
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opendns = {
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ips = [ "208.67.222.222" "208.67.220.220" ];
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url = "https://doh.opendns.com/dns-query";
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};
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custom = {
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inherit (cfg.provider) ips url;
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};
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};
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defaultProvider = "quad9";
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providerCfg =
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concatStringsSep " " [
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"-b"
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(concatStringsSep "," providers."${cfg.provider.kind}".ips)
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"-r"
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providers."${cfg.provider.kind}".url
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];
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in
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{
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meta.maintainers = with lib.maintainers; [ peterhoeg ];
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###### interface
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options.services.https-dns-proxy = {
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enable = mkEnableOption (lib.mdDoc "https-dns-proxy daemon");
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address = mkOption {
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description = lib.mdDoc "The address on which to listen";
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type = types.str;
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default = "127.0.0.1";
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};
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port = mkOption {
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description = lib.mdDoc "The port on which to listen";
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type = types.port;
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default = 5053;
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};
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provider = {
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kind = mkOption {
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description = lib.mdDoc ''
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The upstream provider to use or custom in case you do not trust any of
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the predefined providers or just want to use your own.
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The default is ${defaultProvider} and there are privacy and security
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trade-offs when using any upstream provider. Please consider that
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before using any of them.
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Supported providers: ${concatStringsSep ", " (builtins.attrNames providers)}
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If you pick the custom provider, you will need to provide the
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bootstrap IP addresses as well as the resolver https URL.
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'';
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type = types.enum (builtins.attrNames providers);
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default = defaultProvider;
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};
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ips = mkOption {
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description = lib.mdDoc "The custom provider IPs";
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type = types.listOf types.str;
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};
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url = mkOption {
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description = lib.mdDoc "The custom provider URL";
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type = types.str;
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};
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};
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preferIPv4 = mkOption {
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description = lib.mdDoc ''
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https_dns_proxy will by default use IPv6 and fail if it is not available.
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To play it safe, we choose IPv4.
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'';
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type = types.bool;
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default = true;
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};
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extraArgs = mkOption {
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description = lib.mdDoc "Additional arguments to pass to the process.";
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type = types.listOf types.str;
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default = [ "-v" ];
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};
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};
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###### implementation
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config = lib.mkIf cfg.enable {
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systemd.services.https-dns-proxy = {
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description = "DNS to DNS over HTTPS (DoH) proxy";
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requires = [ "network.target" ];
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after = [ "network.target" ];
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wants = [ "nss-lookup.target" ];
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before = [ "nss-lookup.target" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = rec {
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Type = "exec";
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DynamicUser = true;
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ProtectHome = "tmpfs";
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ExecStart = lib.concatStringsSep " " (
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[
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(lib.getExe pkgs.https-dns-proxy)
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"-a ${toString cfg.address}"
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"-p ${toString cfg.port}"
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"-l -"
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providerCfg
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]
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++ lib.optional cfg.preferIPv4 "-4"
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++ cfg.extraArgs
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);
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Restart = "on-failure";
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};
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};
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};
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}
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