52f0553209
The dnscrypt-proxy service relays regular DNS queries to
a DNSCrypt enabled upstream resolver.
The traffic between the client and the upstream resolver is
encrypted and authenticated, which may mitigate the risk of
MITM attacks and third-party snooping (assuming a trustworthy
upstream).
Though dnscrypt-proxy can run as a standalone DNS client,
the recommended setup is to use it as a forwarder for a
caching DNS client.
To use dnscrypt-proxy as a forwarder for dnsmasq, do
```nix
{
# ...
networking.nameservers = [ "127.0.0.1" ];
networking.dhcpcd.extraConfig = "nohook resolv.conf";
services.dnscrypt-proxy.enable = true;
services.dnscrypt-proxy.localAddress = "127.0.0.1";
services.dnscrypt-proxy.port = 40;
services.dnsmasq.enable = true;
services.dnsmasq.extraConfig = ''
no-resolv
server=127.0.0.1#40
listen-address=127.0.0.1
'';
# ...
}
```
134 lines
3.5 KiB
Nix
134 lines
3.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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apparmorEnabled = config.security.apparmor.enable;
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dnscrypt-proxy = pkgs.dnscrypt-proxy;
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cfg = config.services.dnscrypt-proxy;
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uid = config.ids.uids.dnscrypt-proxy;
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daemonArgs = [ "--daemonize"
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"--user=dnscrypt-proxy"
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"--local-address=${cfg.localAddress}:${toString cfg.port}"
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(optionalString cfg.tcpOnly "--tcp-only")
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"--resolvers-list=${dnscrypt-proxy}/share/dnscrypt-proxy/dnscrypt-resolvers.csv"
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"--resolver-name=${cfg.resolverName}"
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];
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in
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{
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##### interface
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options = {
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services.dnscrypt-proxy = {
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enable = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Enable dnscrypt-proxy.
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The proxy relays regular DNS queries to a DNSCrypt enabled
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upstream resolver.
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The traffic between the client and the upstream resolver is
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encrypted and authenticated, which may mitigate the risk of MITM
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attacks and third-party snooping (assuming the upstream is
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trustworthy).
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'';
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};
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localAddress = mkOption {
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default = "127.0.0.1";
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type = types.string;
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description = ''
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Listen for DNS queries on this address.
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'';
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};
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port = mkOption {
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default = 53;
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type = types.int;
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description = ''
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Listen on this port.
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'';
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};
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resolverName = mkOption {
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default = "opendns";
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type = types.string;
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description = ''
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The name of the upstream DNSCrypt resolver to use.
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See <literal>${dnscrypt-proxy}/share/dnscrypt-proxy/dnscrypt-resolvers.csv</literal>
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for alternative resolvers (e.g., if you are concerned about logging
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and/or server location).
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'';
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};
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tcpOnly = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Force sending encrypted DNS queries to the upstream resolver
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over TCP instead of UDP (on port 443).
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Enabling this option may help circumvent filtering, but should
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not be used otherwise.
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'';
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};
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};
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};
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##### implementation
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config = mkIf cfg.enable {
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### AppArmor profile
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security.apparmor.profiles = mkIf apparmorEnabled [
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(pkgs.writeText "apparmor-dnscrypt-proxy" ''
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${dnscrypt-proxy}/sbin/dnscrypt-proxy {
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capability ipc_lock,
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capability net_bind_service,
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capability net_admin,
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capability sys_chroot,
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capability setgid,
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capability setuid,
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/dev/null rw,
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/dev/urandom r,
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${pkgs.glibc}/lib/*.so mr,
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${pkgs.tzdata}/share/zoneinfo/** r,
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${dnscrypt-proxy}/share/dnscrypt-proxy/** r,
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${pkgs.gcc.gcc}/lib/libssp.so.* mr,
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${pkgs.libsodium}/lib/libsodium.so.* mr,
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}
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'')
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];
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### User
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users.extraUsers = singleton {
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inherit uid;
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name = "dnscrypt-proxy";
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description = "dnscrypt-proxy daemon user";
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};
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### Service definition
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systemd.services.dnscrypt-proxy = {
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description = "dnscrypt-proxy daemon";
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after = [ "network.target" ] ++ optional apparmorEnabled "apparmor.service";
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requires = mkIf apparmorEnabled [ "apparmor.service" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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Type = "forking";
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ExecStart = "${dnscrypt-proxy}/sbin/dnscrypt-proxy ${toString daemonArgs}";
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};
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};
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};
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}
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