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213 lines
7.1 KiB
Nix
213 lines
7.1 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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resolverListFile = "${dnscrypt-proxy}/share/dnscrypt-proxy/dnscrypt-resolvers.csv";
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localAddress = "${cfg.localAddress}:${toString cfg.localPort}";
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daemonArgs =
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[ "--local-address=${localAddress}"
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(optionalString cfg.tcpOnly "--tcp-only")
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(optionalString cfg.ephemeralKeys "-E")
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]
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++ resolverArgs;
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resolverArgs = if (cfg.customResolver != null)
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then
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[ "--resolver-address=${cfg.customResolver.address}:${toString cfg.customResolver.port}"
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"--provider-name=${cfg.customResolver.name}"
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"--provider-key=${cfg.customResolver.key}"
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]
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else
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[ "--resolvers-list=${resolverListFile}"
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"--resolver-name=${toString cfg.resolverName}"
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];
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in
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{
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options = {
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services.dnscrypt-proxy = {
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enable = mkEnableOption "dnscrypt-proxy" // { description = ''
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Whether to enable the DNSCrypt client proxy. The proxy relays
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DNS queries to a DNSCrypt enabled upstream resolver. The traffic
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between the client and the upstream resolver is encrypted and
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authenticated, mitigating the risk of MITM attacks and third-party
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snooping (assuming the upstream is trustworthy).
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Enabling this option does not alter the system nameserver; to relay
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local queries, prepend <literal>127.0.0.1</literal> to
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<option>networking.nameservers</option>.
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The recommended configuration is to run DNSCrypt proxy as a forwarder
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for a caching DNS client, as in
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<programlisting>
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{
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services.dnscrypt-proxy.enable = true;
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services.dnscrypt-proxy.localPort = 43;
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services.dnsmasq.enable = true;
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services.dnsmasq.servers = [ "127.0.0.1#43" ];
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services.dnsmasq.resolveLocalQueries = true; # this is the default
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}
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</programlisting>
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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 to relay on this address. The only reason to
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change this from its default value is to proxy queries on behalf
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of other machines (typically on the local network).
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'';
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};
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localPort = mkOption {
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default = 53;
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type = types.int;
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description = ''
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Listen for DNS queries to relay on this port. The default value
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assumes that the DNSCrypt proxy should relay DNS queries directly.
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When running as a forwarder for another DNS client, set this option
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to a different value; otherwise leave the default.
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'';
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};
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resolverName = mkOption {
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default = "dnscrypt.eu-nl";
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type = types.nullOr types.string;
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description = ''
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The name of the upstream DNSCrypt resolver to use. See
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<filename>${resolverListFile}</filename> for alternative resolvers.
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The default resolver is located in Holland, supports DNS security
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extensions, and claims to not keep logs.
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'';
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};
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customResolver = mkOption {
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default = null;
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description = ''
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Use an unlisted resolver (e.g., a private DNSCrypt provider). For
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advanced users only. If specified, this option takes precedence.
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'';
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type = types.nullOr (types.submodule ({ ... }: { options = {
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address = mkOption {
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type = types.str;
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description = "Resolver IP address";
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example = "208.67.220.220";
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};
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port = mkOption {
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type = types.int;
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description = "Resolver port";
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default = 443;
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};
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name = mkOption {
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type = types.str;
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description = "Provider fully qualified domain name";
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example = "2.dnscrypt-cert.opendns.com";
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};
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key = mkOption {
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type = types.str;
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description = "Provider public key";
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example = "B735:1140:206F:225D:3E2B:D822:D7FD:691E:A1C3:3CC8:D666:8D0C:BE04:BFAB:CA43:FB79";
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};
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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 over
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TCP instead of UDP (on port 443). Use only if the UDP port is blocked.
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'';
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};
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ephemeralKeys = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Compute a new key pair for every query. Enabling this option
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increases CPU usage, but makes it more difficult for the upstream
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resolver to track your usage of their service across IP addresses.
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The default is to re-use the public key pair for all queries, making
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tracking trivial.
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'';
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};
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};
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};
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config = mkIf cfg.enable {
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assertions = [
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{ assertion = (cfg.customResolver != null) || (cfg.resolverName != null);
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message = "please configure upstream DNSCrypt resolver";
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}
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];
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security.apparmor.profiles = mkIf apparmorEnabled (singleton (pkgs.writeText "apparmor-dnscrypt-proxy" ''
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${dnscrypt-proxy}/bin/dnscrypt-proxy {
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/dev/null rw,
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/dev/urandom r,
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/etc/passwd r,
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/etc/group r,
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${config.environment.etc."nsswitch.conf".source} r,
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${pkgs.glibc.out}/lib/*.so mr,
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${pkgs.tzdata}/share/zoneinfo/** r,
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network inet stream,
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network inet6 stream,
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network inet dgram,
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network inet6 dgram,
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${pkgs.gcc.cc.lib}/lib/libssp.so.* mr,
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${pkgs.libsodium.out}/lib/libsodium.so.* mr,
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${pkgs.systemd}/lib/libsystemd.so.* mr,
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${pkgs.xz.out}/lib/liblzma.so.* mr,
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${pkgs.libgcrypt.out}/lib/libgcrypt.so.* mr,
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${pkgs.libgpgerror.out}/lib/libgpg-error.so.* mr,
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${pkgs.libcap.out}/lib/libcap.so.* mr,
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${pkgs.lz4}/lib/liblz4.so.* mr,
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${pkgs.attr.out}/lib/libattr.so.* mr,
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${resolverListFile} r,
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}
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''));
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users.users.dnscrypt-proxy = {
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description = "dnscrypt-proxy daemon user";
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isSystemUser = true;
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group = "dnscrypt-proxy";
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};
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users.groups.dnscrypt-proxy = {};
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systemd.sockets.dnscrypt-proxy = {
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description = "dnscrypt-proxy listening socket";
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socketConfig = {
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ListenStream = "${localAddress}";
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ListenDatagram = "${localAddress}";
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};
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wantedBy = [ "sockets.target" ];
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};
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systemd.services.dnscrypt-proxy = {
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description = "dnscrypt-proxy daemon";
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after = [ "network.target" ] ++ optional apparmorEnabled "apparmor.service";
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requires = [ "dnscrypt-proxy.socket "] ++ optional apparmorEnabled "apparmor.service";
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serviceConfig = {
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Type = "simple";
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NonBlocking = "true";
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ExecStart = "${dnscrypt-proxy}/bin/dnscrypt-proxy ${toString daemonArgs}";
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User = "dnscrypt-proxy";
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Group = "dnscrypt-proxy";
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PrivateTmp = true;
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PrivateDevices = true;
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ProtectHome = true;
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};
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};
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};
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}
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