tailscale: Add tailssh server

protocol/tailscale/tailssh/user_windows.go

@@ -0,0 +1,39 @@
+//go:build with_gvisor && windows
+
+package tailssh
+
+import (
+	"os"
+	"os/exec"
+	"os/user"
+	"path/filepath"
+
+	"github.com/sagernet/sing-box/adapter"
+)
+
+func resolveLocalUserNative(username string) (*adapter.PlatformUser, error) {
+	sysUser, err := user.Lookup(username)
+	if err != nil {
+		return nil, err
+	}
+	return &adapter.PlatformUser{
+		Username: sysUser.Username,
+		// Windows has no numeric uid/gid; these are placeholders (-1). Identity
+		// enforcement compares the token SID via requestedUserMatchesProcess, not
+		// these fields.
+		Uid:     os.Getuid(),
+		Gid:     os.Getgid(),
+		HomeDir: sysUser.HomeDir,
+		Shell:   defaultShell(),
+	}, nil
+}
+
+func defaultShell() string {
+	for _, name := range []string{"pwsh", "powershell", "cmd"} {
+		shellPath, err := exec.LookPath(name)
+		if err == nil {
+			return shellPath
+		}
+	}
+	return filepath.Join(os.Getenv("SystemRoot"), "System32", "cmd.exe")
+}