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configure encrypted dns
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@ -1,5 +1,12 @@
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{ config, pkgs, ... }:
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{
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imports = [
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# DNS settings.
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./dns.nix
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# Nix garbage collection.
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./nix-gc.nix
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];
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# Firmware.
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#
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# The list of hardware.enableAllFirmware contains non-redistributable licensed firmware files.
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@ -21,15 +28,6 @@
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# Enable networking.
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networking.networkmanager.enable = true;
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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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# Set your time zone.
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time.timeZone = "Europe/Berlin";
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@ -75,17 +73,6 @@
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nix.settings.auto-optimise-store = true;
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# Keep only most recent 7 system generations
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imports = [ ./base-gc.nix ];
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#
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# Alternatively: Delete generations older than 7 days
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# https://nixos.wiki/wiki/Storage_optimization#Automation
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#nix.gc = {
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# automatic = true;
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# dates = "weekly";
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# options = "--delete-older-than 7d";
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#};
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# Delete all files in /tmp during boot.
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boot.tmp.cleanOnBoot = true;
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178
modules/dns.nix
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178
modules/dns.nix
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@ -0,0 +1,178 @@
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{ 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: https://nixos.wiki/wiki/Encrypted_DNS#Setting_nameservers
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# Exmaple dnscrypt-proxy config: 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 it is working
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# https://wiki.archlinux.org/title/Dnscrypt-proxy#Check_if_dnscrypt-proxy_is_working
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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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"127.0.0.1"
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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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# 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 = false;
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# Enable a DNS cache to reduce latency and outgoing traffic
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cache = true;
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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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# 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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};
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};
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}
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@ -1,6 +1,16 @@
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{ config, pkgs, ... }:
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{
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# Keep only the 7 most recent system generations.
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#
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# Based on https://github.com/NixOS/nixpkgs/blob/nixos-23.11/nixos/modules/services/misc/nix-gc.nix
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#
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# Alternatively: Delete generations older than 7 days
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# https://nixos.wiki/wiki/Storage_optimization#Automation
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#nix.gc = {
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# automatic = true;
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# dates = "weekly";
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# options = "--delete-older-than 7d";
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#};
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assertions = [{
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assertion = config.nix.enable;
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