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245 lines
8.7 KiB
Nix
245 lines
8.7 KiB
Nix
{ config, pkgs, ... }:
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{
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assertions = [{
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assertion = config.networking.networkmanager.enable;
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message = ''This module is only tested with NetworkManager'';
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} {
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assertion = ! config.services.resolved.enable;
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message = ''This module is incompatible with resolved as resolved does not listen to IPv6 loopback'';
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} {
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assertion = config.networking.enableIPv6;
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message = ''This module assumes that IPv6 networking is available'';
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}];
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# Encrypted, anonymized DNS queries.
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#
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# NixOS networking options:
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# https://nixos.wiki/wiki/Encrypted_DNS#Setting_nameservers
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# Exmaple dnscrypt-proxy config:
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# https://github.com/DNSCrypt/dnscrypt-proxy/blob/master/dnscrypt-proxy/example-dnscrypt-proxy.toml
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# NixOS config examples:
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# https://nixos.wiki/wiki/Encrypted_DNS#dnscrypt-proxy2
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# https://github.com/LudovicoPiero/dotfiles/blob/338b0585d195e6644df9bf8b63fd574af7c18e26/cells/workstations/nixosProfiles/dnscrypt2/default.nix
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#
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# Check if service is running
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# systemctl status dnscrypt-proxy2.service
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#
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# Check if it is working
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# https://wiki.archlinux.org/title/Dnscrypt-proxy#Check_if_dnscrypt-proxy_is_working
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#
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# View generated config file:
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# cat "$(systemctl show -P FragmentPath dnscrypt-proxy2.service)" | grep 'ExecStart='
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# cat ....toml
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# Example: Running c in a container and routhing dnscrypt-proxy queries through it
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# https://github.com/AtaraxiaSjel/nixos-config/blob/3510d178bafeb5d742806d25d5c6c34570c498e8/profiles/workspace/proxy.nix
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# TODO
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# create new config option
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# encrypted-dns
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# If enabled
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# use dnscrypt
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# don't use adguard and ffmuc DNS servers
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# Firefox use system DNS
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networking.nameservers = [
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# IPv4
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"127.0.0.1"
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# IPv6
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"::1"
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];
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#networking.nameservers = [
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# # https://www.kuketz-blog.de/empfehlungsecke/#dns
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# # unfiltered.adguard-dns.com (supports DNSSEC)
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# "94.140.14.140" "94.140.14.141"
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# # https://www.kuketz-blog.de/empfehlungsecke/#dns
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# # dot.ffmuc.net (supports DNSSEC)
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# "5.1.66.255" "185.150.99.255"
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#];
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# If using dhcpcd.
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networking.dhcpcd.extraConfig = "nohook resolv.conf";
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# If using NetworkManager.
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networking.networkmanager.dns = "none";
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systemd.services.dnscrypt-proxy2.serviceConfig = {
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StateDirectory = "dnscrypt-proxy";
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};
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services.dnscrypt-proxy2 = {
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enable = true;
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settings = {
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#listen_addresses = ['127.0.0.1:53'];
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# Enable a DNS cache to reduce latency and outgoing traffic
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cache = true;
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# Dont alter the TTL of cached entries
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# https://github.com/DNSCrypt/dnscrypt-proxy/issues/1552#issuecomment-750021306
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cache_min_ttl = 0;
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# DNSCrypt: Create a new, unique key for every single DNS query.
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# This may improve privacy but can also have a significant impact on CPU usage.
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# Only enable if you don't have a lot of network load.
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#dnscrypt_ephemeral_keys = false
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# The cipher suite can't be changed for TLS 1.3 connections, see
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# https://github.com/dnscrypt/dnscrypt-proxy/wiki/Performance#cipher-suites-doh
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# https://github.com/DNSCrypt/dnscrypt-proxy/issues/2359#issuecomment-1488501839
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#tls_cipher_suite = ...
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bootstrap_resolvers = [
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#
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# Local DNS servers
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#
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# DNS server of Fritz!Box guest WiFi
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"192.168.179.1:53"
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#
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# Public DNS servers
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#
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# https://www.kuketz-blog.de/empfehlungsecke/#dns
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# dot.ffmuc.net (supports DNSSEC)
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"5.1.66.255:53" "185.150.99.255:53"
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# https://www.kuketz-blog.de/empfehlungsecke/#dns
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# unfiltered.adguard-dns.com (supports DNSSEC)
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"94.140.14.140:853" "94.140.14.141:853"
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"9.9.9.11:53" # Quad9
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"1.1.1.1:53" # Cloudflare
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"8.8.8.8:53" # Google
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];
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# Use servers reachable over IPv4.
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ipv4_servers = true;
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# Use servers reachable over IPv6.
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# Do not enable if you don't have IPv6 connectivity.
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ipv6_servers = true;
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block_ipv6 = false;
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# Use servers implementing the DNSCrypt protocol.
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dnscrypt_servers = true;
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# Use servers implementing the DNS-over-HTTPS protocol.
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doh_servers = false;
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# Use servers implementing the Oblivious DoH protocol
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odoh_servers = false;
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# Server must support DNS security extensions (DNSSEC).
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require_dnssec = true;
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# Server must not log user queries (declarative).
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require_nolog = true;
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# Server must not enforce its own blacklist (for parental control, ads blocking...).
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require_nofilter = true;
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# Fetch list of dnscrypt server names.
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# These server names are used below in the `server_names` and `via` options.
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sources = {
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public-resolvers = {
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urls = [
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"https://raw.githubusercontent.com/DNSCrypt/dnscrypt-resolvers/master/v3/public-resolvers.md"
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];
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cache_file = "/var/lib/dnscrypt-proxy2/public-resolvers.md";
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minisign_key = "RWQf6LRCGA9i53mlYecO4IzT51TGPpvWucNSCh1CBM0QTaLn73Y7GFO3";
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};
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relays = {
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urls = [
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"https://raw.githubusercontent.com/DNSCrypt/dnscrypt-resolvers/master/v3/relays.md"
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];
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cache_file = "/var/lib/dnscrypt-proxy2/relays.md";
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minisign_key = "RWQf6LRCGA9i53mlYecO4IzT51TGPpvWucNSCh1CBM0QTaLn73Y7GFO3";
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};
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};
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# Names of servers to be used for DNS queries.
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# These are not contacted directly.
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# Instead, the queries are forwarded by relay servers.
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server_names = [
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# Operated by https://cryptostorm.is/
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"cs-berlin"
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"cs-de"
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"cs-dus1"
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"cs-dus2"
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"cs-dus3"
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"cs-dus4"
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# Other operators.
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"dns.digitale-gesellschaft.ch"
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"dns.digitale-gesellschaft.ch-ipv6"
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"dct-de"
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"dct-nl"
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"dns.digitalsize.net"
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"dns.digitalsize.net-ipv6"
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"ibksturm" # Switzerland
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"doh-ibksturm" # Switzerland
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"faelix-ch-ipv4" # Switzerland
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# Already used as relay server.
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#"dnswarden-uncensor-dc-swiss" # Switzerland
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# DNS servers that filter some requests.
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#"switch" # Filters requests
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#"dnsforge.de" # Filters requests
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#"brahma-world" # Filters requests
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#"brahma-world-ipv6" # Filters requests
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#"libredns" # No DNSSEC
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];
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anonymized_dns = {
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routes = [
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{
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# All DNS servers given in `server_names`.
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server_name = "*";
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# Relay servers.
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# These forward requests to the chosen DNS servers.
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via = [
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"anon-digitalprivacy.diy-ipv4" # Germany, by https://digitalprivacy.diy
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"anon-serbica" # Netherlands, by https://litepay.ch
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"anon-kama" # France, by Frank Denis (@jedisct1)
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"anon-scaleway" # France, by Frank Denis (@jedisct1)
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"anon-scaleway2" # France, by Frank Denis (@jedisct1)
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"anon-fluffycat-fr-01" # France
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"anon-dnswarden-swiss"
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# Already used as DNS server.
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#"anon-cs-berlin"
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#"anon-cs-de"
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#"anon-cs-dus1" # Germany
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#"anon-cs-dus2" # Germany
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#"anon-cs-dus3" # Germany
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#"anon-cs-dus4" # Germany
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#"anon-cs-fr"
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#"anon-cs-dk"
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#"anon-cs-belgium"
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#"anon-cs-nl"
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#"anon-cs-nl2"
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#"anon-cs-poland"
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#"anon-cs-czech"
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#"anon-cs-austria"
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];
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}
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];
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# Skip resolvers incompatible with anonymization instead of using them directly.
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skip_incompatible = true;
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};
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# As this dict is converted to JSON, we can't use `proxy = lib.mkIf (...) "socks5://127.0.0.1:9050"` inside it - it won't be evaluated.
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# Instead, we merge it with another dict below:
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} // (
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# On some networks dnscrypt-proxy can't resove DNS queries.
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#
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# Example: Fritz!Box Guest WiFi
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# https://docs.pi-hole.net/routers/fritzbox/
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# The Fritz!Box always sets its own IP as DNS server for the guest network.
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#
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# Solution: Proxy dnscrypt-proxy through Tor
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# - Currently, we have this enabled.
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# - The latency of DNS queries is higher than without Tor - at about 130ms.
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if config.services.tor.torsocks.enable
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then {
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# Route all TCP connections to a local Tor node.
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# As Tor doesn't support UDP, `force_tcp` has to be set to `true`.
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proxy = "socks5://127.0.0.1:9050";
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# This can be useful if you need to route everything through Tor.
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# Otherwise, leave this to `false`.
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force_tcp = true;
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} else {}
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);
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};
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}
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