nekoray: make it possible to use setcap wrapper

pkgs/by-name/ne/nekoray/core-also-check-capabilities.patch

@@ -0,0 +1,43 @@
+diff --git a/server.go b/server.go
+index c2a6be0..8aeca1c 100644
+--- a/server.go
++++ b/server.go
+@@ -11,6 +11,7 @@ import (
+ 	E "github.com/sagernet/sing/common/exceptions"
+ 	"github.com/sagernet/sing/common/metadata"
+ 	"github.com/sagernet/sing/service"
++	"golang.org/x/sys/unix"
+ 	"log"
+ 	"nekobox_core/gen"
+ 	"nekobox_core/internal/boxbox"
+@@ -359,13 +360,25 @@ func (s *server) CompileGeoSiteToSrs(ctx context.Context, in *gen.CompileGeoSite
+ }
+ 
+ func (s *server) IsPrivileged(ctx context.Context, _ *gen.EmptyReq) (*gen.IsPrivilegedResponse, error) {
+-	if runtime.GOOS == "windows" {
+-		return &gen.IsPrivilegedResponse{
+-			HasPrivilege: false,
+-		}, nil
++	ret := false
++	if runtime.GOOS == "windows" || os.Geteuid() == 0 {
++		ret = true
++	} else if runtime.GOOS == "linux" {
++		caps := unix.CapUserHeader{
++			Version: unix.LINUX_CAPABILITY_VERSION_3,
++			Pid:     0, // current
++		}
++		var data [2]unix.CapUserData
++		err := unix.Capget(&caps, &data[0])
++		if err != nil {
++			ret = false
++		} else {
++			// CAP_NET_ADMIN = 12
++			ret = (data[0].Effective & (1 << unix.CAP_NET_ADMIN)) != 0
++		}
+ 	}
+ 
+-	return &gen.IsPrivilegedResponse{HasPrivilege: os.Geteuid() == 0}, nil
++	return &gen.IsPrivilegedResponse{HasPrivilege: ret}, nil
+ }
+ 
+ func (s *server) SpeedTest(ctx context.Context, in *gen.SpeedTestRequest) (*gen.SpeedTestResponse, error) {

pkgs/by-name/ne/nekoray/nixos-disable-setuid-request.patch

@@ -0,0 +1,47 @@
+diff --git a/src/global/NekoGui.cpp b/src/global/NekoGui.cpp
+index 7943d7a..5bb20cc 100644
+--- a/src/global/NekoGui.cpp
++++ b/src/global/NekoGui.cpp
+@@ -355,6 +355,12 @@ namespace NekoGui {
+     // System Utils
+ 
+     QString FindNekoBoxCoreRealPath() {
++        // find in PATH first
++        QString path = QStandardPaths::findExecutable("nekobox_core");
++        if (!path.isEmpty()) {
++            return path;
++        }
++
+         auto fn = QApplication::applicationDirPath() + "/nekobox_core";
+         auto fi = QFileInfo(fn);
+         if (fi.isSymLink()) return fi.symLinkTarget();
+diff --git a/src/ui/mainwindow.cpp b/src/ui/mainwindow.cpp
+index 9aa46b2..ba7137a 100644
+--- a/src/ui/mainwindow.cpp
++++ b/src/ui/mainwindow.cpp
+@@ -125,8 +125,7 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWi
+     NekoGui::dataStore->core_port = MkPort();
+     if (NekoGui::dataStore->core_port <= 0) NekoGui::dataStore->core_port = 19810;
+ 
+-    auto core_path = QApplication::applicationDirPath() + "/";
+-    core_path += "nekobox_core";
++    auto core_path = NekoGui::FindNekoBoxCoreRealPath();
+ 
+     QStringList args;
+     args.push_back("nekobox");
+@@ -844,6 +843,15 @@ bool MainWindow::get_elevated_permissions(int reason) {
+         return true;
+     }
+     if (NekoGui::IsAdmin()) return true;
++    QMessageBox::critical(
++        GetMessageBoxParent(),
++        tr("Unable to elevate privileges when installed with Nix"),
++        tr("Due to the read-only property of Nix store, we cannot set suid for nekobox_core. If you are using NixOS, please set `programs.nekoray.tunMode.enable` option to elevate privileges."),
++        QMessageBox::Ok
++    );
++    return false;
++    // The following code isn't effective, preserve to avoid merge conflict
++
+ #ifdef Q_OS_LINUX
+     if (!Linux_HavePkexec()) {
+         MessageBoxWarning(software_name, "Please install \"pkexec\" first.");

pkgs/by-name/ne/nekoray/package.nix

@@ -60,6 +60,11 @@ stdenv.mkDerivation (finalAttrs: {
     # we already package those two files in nixpkgs
     # we can't place file at that location using our builder so we must change the search directory to be relative to the built executable
     ./search-for-geodata-in-install-location.patch
+
+    # disable suid request as it cannot be applied to nekobox_core in nix store
+    # and prompt users to use NixOS module instead. And use nekobox_core from PATH
+    # to make use of security wrappers
+    ./nixos-disable-setuid-request.patch
   ];
 
   installPhase = ''
@@ -99,6 +104,11 @@ stdenv.mkDerivation (finalAttrs: {
     inherit (finalAttrs) version src;
     sourceRoot = "${finalAttrs.src.name}/core/server";
 
+    patches = [
+      # also check cap_net_admin so we don't have to set suid
+      ./core-also-check-capabilities.patch
+    ];
+
     vendorHash = "sha256-CTI9wDPJ9dYpUwvszY2nRfi+NW0nO8imt9lsQ7Nd1Q8=";
 
     # ldflags and tags are taken from script/build_go.sh