commit 90e0ed32efd16d151fe8ae9362e84f17703f0b3f · pyrox.dev/nixpkgs

nixos/modules/module-list.nix

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         ./services/networking/dhcpd.nix

     

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         ./services/networking/dnschain.nix

     

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         ./services/networking/dnscrypt-proxy.nix

     

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         ./services/networking/dnscrypt-wrapper.nix

     

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         ./services/networking/dnsmasq.nix

     

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         ./services/networking/ejabberd.nix

     

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         ./services/networking/fan.nix

+187

nixos/modules/services/networking/dnscrypt-wrapper.nix

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       { config, lib, pkgs, ... }:

     

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       with lib;

     

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       let

     

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         cfg     = config.services.dnscrypt-wrapper;

     

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         dataDir = "/var/lib/dnscrypt-wrapper";

     

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         daemonArgs = with cfg; [

     

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           "--listen-address=${address}:${toString port}"

     

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           "--resolver-address=${upstream.address}:${toString upstream.port}"

     

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           "--provider-name=${providerName}"

     

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           "--provider-publickey-file=public.key"

     

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           "--provider-secretkey-file=secret.key"

     

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           "--provider-cert-file=${providerName}.crt"

     

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           "--crypt-secretkey-file=${providerName}.key"

     

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         ];

     

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         genKeys = ''

     

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           # generates time-limited keypairs

     

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           keyGen() {

     

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             dnscrypt-wrapper --gen-crypt-keypair \

     

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               --crypt-secretkey-file=${cfg.providerName}.key

     

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             dnscrypt-wrapper --gen-cert-file \

     

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               --crypt-secretkey-file=${cfg.providerName}.key \

     

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               --provider-cert-file=${cfg.providerName}.crt \

     

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               --provider-publickey-file=public.key \

     

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               --provider-secretkey-file=secret.key \

     

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               --cert-file-expire-days=${toString cfg.keys.expiration}

     

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           }

     

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           cd ${dataDir}

     

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           # generate provider keypair (first run only)

     

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           if [ ! -f public.key ] || [ ! -f secret.key ]; then

     

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             dnscrypt-wrapper --gen-provider-keypair

     

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           fi

     

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           # generate new keys for rotation

     

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           if [ ! -f ${cfg.providerName}.key ] || [ ! -f ${cfg.providerName}.crt ]; then

     

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             keyGen

     

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           fi

     

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         '';

     

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         rotateKeys = ''

     

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           # check if keys are not expired

     

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           keyValid() {

     

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             fingerprint=$(dnscrypt-wrapper --show-provider-publickey-fingerprint | awk '{print $(NF)}')

     

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             dnscrypt-proxy --test=${toString (cfg.keys.checkInterval + 1)} \

     

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               --resolver-address=127.0.0.1:${toString cfg.port} \

     

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               --provider-name=${cfg.providerName} \

     

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               --provider-key=$fingerprint

     

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           }

     

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           cd ${dataDir}

     

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           # archive old keys and restart the service

     

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           if ! keyValid; then

     

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             mkdir -p oldkeys

     

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             mv ${cfg.providerName}.key oldkeys/${cfg.providerName}-$(date +%F-%T).key

     

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             mv ${cfg.providerName}.crt oldkeys/${cfg.providerName}-$(date +%F-%T).crt

     

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             systemctl restart dnscrypt-wrapper

     

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           fi

     

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         '';

     

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       in {

     

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         ###### interface

     

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         options.services.dnscrypt-wrapper = {

     

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           enable = mkEnableOption "DNSCrypt wrapper";

     

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           address = mkOption {

     

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             type = types.str;

     

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             default = "127.0.0.1";

     

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             description = ''

     

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               The DNSCrypt wrapper will bind to this IP address.

     

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             '';

     

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           };

     

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           port = mkOption {

     

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             type = types.int;

     

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             default = 5353;

     

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             description = ''

     

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               The DNSCrypt wrapper will listen for DNS queries on this port.

     

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             '';

     

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           };

     

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           providerName = mkOption {

     

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             type = types.str;

     

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             default = "2.dnscrypt-cert.${config.networking.hostName}";

     

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             example = "2.dnscrypt-cert.myresolver";

     

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             description = ''

     

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               The name that will be given to this DNSCrypt resolver.

     

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               Note: the resolver name must start with <literal>2.dnscrypt-cert.</literal>.

     

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             '';

     

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           };

     

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           upstream.address = mkOption {

     

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             type = types.str;

     

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             default = "127.0.0.1";

     

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             description = ''

     

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               The IP address of the upstream DNS server DNSCrypt will "wrap".

     

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             '';

     

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           };

     

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           upstream.port = mkOption {

     

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             type = types.int;

     

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             default = 53;

     

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             description = ''

     

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               The port of the upstream DNS server DNSCrypt will "wrap".

     

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             '';

     

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           };

     

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           keys.expiration = mkOption {

     

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             type = types.int;

     

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             default = 30;

     

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             description = ''

     

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               The duration (in days) of the time-limited secret key.

     

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               This will be automatically rotated before expiration.

     

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             '';

     

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           };

     

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           keys.checkInterval = mkOption {

     

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             type = types.int;

     

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             default = 1440;

     

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             description = ''

     

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               The time interval (in minutes) between key expiration checks.

     

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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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           users.users.dnscrypt-wrapper = {

     

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             description = "dnscrypt-wrapper daemon user";

     

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             home = "${dataDir}";

     

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             createHome = true;

     

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           };

     

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           users.groups.dnscrypt-wrapper = { };

     

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           systemd.services.dnscrypt-wrapper = {

     

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             description = "dnscrypt-wrapper daemon";

     

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             after    = [ "network.target" ];

     

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             wantedBy = [ "multi-user.target" ];

     

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             path     = [ pkgs.dnscrypt-wrapper ];

     

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             serviceConfig = {

     

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               User = "dnscrypt-wrapper";

     

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               WorkingDirectory = dataDir;

     

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               Restart   = "on-failure";

     

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               ExecStart = "${pkgs.dnscrypt-wrapper}/bin/dnscrypt-wrapper ${toString daemonArgs}";

     

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             };

     

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             preStart = genKeys;

     

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           };

     

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           systemd.services.dnscrypt-wrapper-rotate = {

     

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             after    = [ "network.target" ];

     

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             requires = [ "dnscrypt-wrapper.service" ];

     

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             description = "Rotates DNSCrypt wrapper keys if soon to expire";

     

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             path   = with pkgs; [ dnscrypt-wrapper dnscrypt-proxy gawk ];

     

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             script = rotateKeys;

     

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           };

     

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           systemd.timers.dnscrypt-wrapper-rotate = {

     

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             description = "Periodically check DNSCrypt wrapper keys for expiration";

     

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             wantedBy = [ "multi-user.target" ];

     

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             timerConfig = {

     

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               Unit = "dnscrypt-wrapper-rotate.service";

     

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               OnBootSec = "1min";

     

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               OnUnitActiveSec = cfg.keys.checkInterval * 60;

     

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             };

     

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           };

     

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         };

     

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       }