Merge pull request #321142 from treyfortmuller/tff/cloudflare-warp-module

nixos/cloudflare-warp: init module

maintainers/maintainer-list.nix

@@ -20551,6 +20551,12 @@
     githubId = 1312290;
     name = "Trevor Joynson";
   };
+  treyfortmuller = {
+    email = "treyunofficial@gmail.com";
+    github = "treyfortmuller";
+    githubId = 5715025;
+    name = "Trey Fortmuller";
+  };
   tricktron = {
     email = "tgagnaux@gmail.com";
     github = "tricktron";

nixos/modules/module-list.nix

@@ -973,6 +973,7 @@
   ./services/networking/clatd.nix
   ./services/networking/cloudflare-dyndns.nix
   ./services/networking/cloudflared.nix
+  ./services/networking/cloudflare-warp.nix
   ./services/networking/cntlm.nix
   ./services/networking/connman.nix
   ./services/networking/consul.nix

nixos/modules/services/networking/cloudflare-warp.nix

@@ -0,0 +1,91 @@
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.services.cloudflare-warp;
+in
+{
+  options.services.cloudflare-warp = {
+    enable = lib.mkEnableOption "Cloudflare Zero Trust client daemon";
+
+    package = lib.mkPackageOption pkgs "cloudflare-warp" { };
+
+    rootDir = lib.mkOption {
+      type = lib.types.str;
+      default = "/var/lib/cloudflare-warp";
+      description = ''
+        Working directory for the warp-svc daemon.
+      '';
+    };
+
+    udpPort = lib.mkOption {
+      type = lib.types.port;
+      default = 2408;
+      description = ''
+        The UDP port to open in the firewall. Warp uses port 2408 by default, but fallback ports can be used
+        if that conflicts with another service. See the [firewall documentation](https://developers.cloudflare.com/cloudflare-one/connections/connect-devices/warp/deployment/firewall#warp-udp-ports)
+        for the pre-configured available fallback ports.
+      '';
+    };
+
+    openFirewall = lib.mkEnableOption "opening UDP ports in the firewall" // {
+      default = true;
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = [ cfg.package ];
+
+    networking.firewall = lib.mkIf cfg.openFirewall {
+      allowedUDPPorts = [ cfg.udpPort ];
+    };
+
+    systemd.tmpfiles.rules = [
+      "d ${cfg.rootDir}    - root root"
+      "z ${cfg.rootDir}    - root root"
+    ];
+
+    systemd.services.cloudflare-warp = {
+      enable = true;
+      description = "Cloudflare Zero Trust Client Daemon";
+
+      # lsof is used by the service to determine which UDP port to bind to
+      # in the case that it detects collisions.
+      path = [ pkgs.lsof ];
+      requires = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+
+      serviceConfig =
+        let
+          caps = [
+            "CAP_NET_ADMIN"
+            "CAP_NET_BIND_SERVICE"
+            "CAP_SYS_PTRACE"
+          ];
+        in
+        {
+          Type = "simple";
+          ExecStart = "${cfg.package}/bin/warp-svc";
+          ReadWritePaths = [ "${cfg.rootDir}" "/etc/resolv.conf" ];
+          CapabilityBoundingSet = caps;
+          AmbientCapabilities = caps;
+          Restart = "always";
+          RestartSec = 5;
+          Environment = [ "RUST_BACKTRACE=full" ];
+          WorkingDirectory = cfg.rootDir;
+
+          # See the systemd.exec docs for the canonicalized paths, the service
+          # makes use of them for logging, and account state info tracking.
+          # https://www.freedesktop.org/software/systemd/man/latest/systemd.exec.html#RuntimeDirectory=
+          StateDirectory = "cloudflare-warp";
+          RuntimeDirectory = "cloudflare-warp";
+          LogsDirectory = "cloudflare-warp";
+
+          # The service needs to write to /etc/resolv.conf to configure DNS, so that file would have to
+          # be world read/writable to run as anything other than root.
+          User = "root";
+          Group = "root";
+        };
+    };
+  };
+
+  meta.maintainers = with lib.maintainers; [ treyfortmuller ];
+}