Add 'nixpkgs/' from commit '2436c27541b2f52deea3a4c1691216a02152e729'

git-subtree-dir: nixpkgs
git-subtree-mainline: 1148b1d122bc03e9a3665856c9b7bb96bd4e3994
git-subtree-split: 2436c27541b2f52deea3a4c1691216a02152e729

1 files changed, 199 insertions, 0 deletions

diff --git a/nixpkgs/nixos/modules/services/networking/dnscrypt-wrapper.nix b/nixpkgs/nixos/modules/services/networking/dnscrypt-wrapper.nix
new file mode 100644
index 00000000000..bf13d5c6f5f
--- /dev/null
+++ b/nixpkgs/nixos/modules/services/networking/dnscrypt-wrapper.nix
@@ -0,0 +1,199 @@
+{ config, lib, pkgs, ... }:
+with lib;
+
+let
+  cfg     = config.services.dnscrypt-wrapper;
+  dataDir = "/var/lib/dnscrypt-wrapper";
+
+  daemonArgs = with cfg; [
+    "--listen-address=${address}:${toString port}"
+    "--resolver-address=${upstream.address}:${toString upstream.port}"
+    "--provider-name=${providerName}"
+    "--provider-publickey-file=public.key"
+    "--provider-secretkey-file=secret.key"
+    "--provider-cert-file=${providerName}.crt"
+    "--crypt-secretkey-file=${providerName}.key"
+  ];
+
+  genKeys = ''
+    # generates time-limited keypairs
+    keyGen() {
+      dnscrypt-wrapper --gen-crypt-keypair \
+        --crypt-secretkey-file=${cfg.providerName}.key
+
+      dnscrypt-wrapper --gen-cert-file \
+        --crypt-secretkey-file=${cfg.providerName}.key \
+        --provider-cert-file=${cfg.providerName}.crt \
+        --provider-publickey-file=public.key \
+        --provider-secretkey-file=secret.key \
+        --cert-file-expire-days=${toString cfg.keys.expiration}
+    }
+
+    cd ${dataDir}
+
+    # generate provider keypair (first run only)
+    if [ ! -f public.key ] || [ ! -f secret.key ]; then
+      dnscrypt-wrapper --gen-provider-keypair
+    fi
+
+    # generate new keys for rotation
+    if [ ! -f ${cfg.providerName}.key ] || [ ! -f ${cfg.providerName}.crt ]; then
+      keyGen
+    fi
+  '';
+
+  rotateKeys = ''
+    # check if keys are not expired
+    keyValid() {
+      fingerprint=$(dnscrypt-wrapper --show-provider-publickey | awk '{print $(NF)}')
+      dnscrypt-proxy --test=${toString (cfg.keys.checkInterval + 1)} \
+        --resolver-address=127.0.0.1:${toString cfg.port} \
+        --provider-name=${cfg.providerName} \
+        --provider-key=$fingerprint
+    }
+
+    cd ${dataDir}
+
+    # archive old keys and restart the service
+    if ! keyValid; then
+      echo "certificate soon to become invalid; backing up old cert"
+      mkdir -p oldkeys
+      mv -v ${cfg.providerName}.key oldkeys/${cfg.providerName}-$(date +%F-%T).key
+      mv -v ${cfg.providerName}.crt oldkeys/${cfg.providerName}-$(date +%F-%T).crt
+      systemctl restart dnscrypt-wrapper
+    fi
+  '';
+
+in {
+
+
+  ###### interface
+
+  options.services.dnscrypt-wrapper = {
+    enable = mkEnableOption "DNSCrypt wrapper";
+
+    address = mkOption {
+      type = types.str;
+      default = "127.0.0.1";
+      description = ''
+        The DNSCrypt wrapper will bind to this IP address.
+      '';
+    };
+
+    port = mkOption {
+      type = types.int;
+      default = 5353;
+      description = ''
+        The DNSCrypt wrapper will listen for DNS queries on this port.
+      '';
+    };
+
+    providerName = mkOption {
+      type = types.str;
+      default = "2.dnscrypt-cert.${config.networking.hostName}";
+      example = "2.dnscrypt-cert.myresolver";
+      description = ''
+        The name that will be given to this DNSCrypt resolver.
+        Note: the resolver name must start with <literal>2.dnscrypt-cert.</literal>.
+      '';
+    };
+
+    upstream.address = mkOption {
+      type = types.str;
+      default = "127.0.0.1";
+      description = ''
+        The IP address of the upstream DNS server DNSCrypt will "wrap".
+      '';
+    };
+
+    upstream.port = mkOption {
+      type = types.int;
+      default = 53;
+      description = ''
+        The port of the upstream DNS server DNSCrypt will "wrap".
+      '';
+    };
+
+    keys.expiration = mkOption {
+      type = types.int;
+      default = 30;
+      description = ''
+        The duration (in days) of the time-limited secret key.
+        This will be automatically rotated before expiration.
+      '';
+    };
+
+    keys.checkInterval = mkOption {
+      type = types.int;
+      default = 1440;
+      description = ''
+        The time interval (in minutes) between key expiration checks.
+      '';
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+
+    users.users.dnscrypt-wrapper = {
+      description = "dnscrypt-wrapper daemon user";
+      home = "${dataDir}";
+      createHome = true;
+    };
+    users.groups.dnscrypt-wrapper = { };
+
+    security.polkit.extraConfig = ''
+      // Allow dnscrypt-wrapper user to restart dnscrypt-wrapper.service
+      polkit.addRule(function(action, subject) {
+          if (action.id == "org.freedesktop.systemd1.manage-units" &&
+              action.lookup("unit") == "dnscrypt-wrapper.service" &&
+              subject.user == "dnscrypt-wrapper") {
+              return polkit.Result.YES;
+          }
+        });
+    '';
+
+    systemd.services.dnscrypt-wrapper = {
+      description = "dnscrypt-wrapper daemon";
+      after    = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      path     = [ pkgs.dnscrypt-wrapper ];
+
+      serviceConfig = {
+        User = "dnscrypt-wrapper";
+        WorkingDirectory = dataDir;
+        Restart   = "on-failure";
+        ExecStart = "${pkgs.dnscrypt-wrapper}/bin/dnscrypt-wrapper ${toString daemonArgs}";
+      };
+
+      preStart = genKeys;
+    };
+
+
+    systemd.services.dnscrypt-wrapper-rotate = {
+      after    = [ "network.target" ];
+      requires = [ "dnscrypt-wrapper.service" ];
+      description = "Rotates DNSCrypt wrapper keys if soon to expire";
+
+      path   = with pkgs; [ dnscrypt-wrapper dnscrypt-proxy gawk ];
+      script = rotateKeys;
+      serviceConfig.User = "dnscrypt-wrapper";
+    };
+
+
+    systemd.timers.dnscrypt-wrapper-rotate = {
+      description = "Periodically check DNSCrypt wrapper keys for expiration";
+      wantedBy = [ "multi-user.target" ];
+
+      timerConfig = {
+        Unit = "dnscrypt-wrapper-rotate.service";
+        OnBootSec = "1min";
+        OnUnitActiveSec = cfg.keys.checkInterval * 60;
+      };
+    };
+
+  };
+}