Initial Windows support

peercred_windows.go

@@ -0,0 +1,43 @@
+// Copyright (c) 2021-2025 AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package peercred
+
+import (
+	"fmt"
+
+	"github.com/rwinkhart/sys-freebsd-13-xucred/windows"
+)
+
+// Get returns the peer credentials for c.
+func Get(h *windows.Handle) *Creds {
+	creds, _ := get(h)
+	return creds
+}
+
+func get(h *windows.Handle) (*Creds, error) {
+	// get PID
+	var clientPID uint32
+	windows.GetNamedPipeClientProcessId(*h, &clientPID)
+
+	// get SID (UID)
+	var access uint32 = windows.PROCESS_QUERY_INFORMATION
+	hProcess, herr := windows.OpenProcess(access, false, clientPID)
+	defer windows.CloseHandle(hProcess)
+	var hToken windows.Token
+	windows.OpenProcessToken(hProcess, windows.TOKEN_QUERY, &hToken)
+	defer hToken.Close()
+	tokenUser, terr := hToken.GetTokenUser()
+	if terr != nil {
+		return nil, fmt.Errorf("windows.OpenProcessToken: %w", terr)
+	}
+	if herr != nil {
+		return nil, fmt.Errorf("windows.OpenProcess: %w", herr)
+	}
+
+	return &Creds{
+		pid: int(clientPID),
+		uid: tokenUser.User.Sid.String(),
+	}, nil
+}