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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build windows
package svc
import (
"strings"
"unsafe"
"golang.org/x/sys/windows"
)
func allocSid(subAuth0 uint32) (*windows.SID, error) {
var sid *windows.SID
err := windows.AllocateAndInitializeSid(&windows.SECURITY_NT_AUTHORITY,
1, subAuth0, 0, 0, 0, 0, 0, 0, 0, &sid)
if err != nil {
return nil, err
}
return sid, nil
}
// IsAnInteractiveSession determines if calling process is running interactively.
// It queries the process token for membership in the Interactive group.
// http://stackoverflow.com/questions/2668851/how-do-i-detect-that-my-application-is-running-as-service-or-in-an-interactive-s
//
// Deprecated: Use IsWindowsService instead.
func IsAnInteractiveSession() (bool, error) {
interSid, err := allocSid(windows.SECURITY_INTERACTIVE_RID)
if err != nil {
return false, err
}
defer windows.FreeSid(interSid)
serviceSid, err := allocSid(windows.SECURITY_SERVICE_RID)
if err != nil {
return false, err
}
defer windows.FreeSid(serviceSid)
t, err := windows.OpenCurrentProcessToken()
if err != nil {
return false, err
}
defer t.Close()
gs, err := t.GetTokenGroups()
if err != nil {
return false, err
}
for _, g := range gs.AllGroups() {
if windows.EqualSid(g.Sid, interSid) {
return true, nil
}
if windows.EqualSid(g.Sid, serviceSid) {
return false, nil
}
}
return false, nil
}
// IsWindowsService reports whether the process is currently executing
// as a Windows service.
func IsWindowsService() (bool, error) {
// The below technique looks a bit hairy, but it's actually
// exactly what the .NET framework does for the similarly named function:
// https://github.com/dotnet/extensions/blob/f4066026ca06984b07e90e61a6390ac38152ba93/src/Hosting/WindowsServices/src/WindowsServiceHelpers.cs#L26-L31
// Specifically, it looks up whether the parent process has session ID zero
// and is called "services".
var currentProcess windows.PROCESS_BASIC_INFORMATION
infoSize := uint32(unsafe.Sizeof(currentProcess))
err := windows.NtQueryInformationProcess(windows.CurrentProcess(), windows.ProcessBasicInformation, unsafe.Pointer(¤tProcess), infoSize, &infoSize)
if err != nil {
return false, err
}
var parentProcess *windows.SYSTEM_PROCESS_INFORMATION
for infoSize = uint32((unsafe.Sizeof(*parentProcess) + unsafe.Sizeof(uintptr(0))) * 1024); ; {
parentProcess = (*windows.SYSTEM_PROCESS_INFORMATION)(unsafe.Pointer(&make([]byte, infoSize)[0]))
err = windows.NtQuerySystemInformation(windows.SystemProcessInformation, unsafe.Pointer(parentProcess), infoSize, &infoSize)
if err == nil {
break
} else if err != windows.STATUS_INFO_LENGTH_MISMATCH {
return false, err
}
}
for ; ; parentProcess = (*windows.SYSTEM_PROCESS_INFORMATION)(unsafe.Pointer(uintptr(unsafe.Pointer(parentProcess)) + uintptr(parentProcess.NextEntryOffset))) {
if parentProcess.UniqueProcessID == currentProcess.InheritedFromUniqueProcessId {
return parentProcess.SessionID == 0 && strings.EqualFold("services.exe", parentProcess.ImageName.String()), nil
}
if parentProcess.NextEntryOffset == 0 {
break
}
}
return false, nil
}