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7844c3c200
Alex copied this from a temporary thing I had written for the runtime package. In runtime, you can't really access other packages like syscall, so everything has to be very manual. But in x/sys, we can do things properly. So this reimplements the function in a more straight forward way. Change-Id: I1634904bb1e10f33252954ce02d4b17ae56592e5 Reviewed-on: https://go-review.googlesource.com/c/sys/+/298830 Trust: Jason A. Donenfeld <Jason@zx2c4.com> Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
109 lines
3.1 KiB
Go
109 lines
3.1 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build windows
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package svc
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import (
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"path/filepath"
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"strings"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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func allocSid(subAuth0 uint32) (*windows.SID, error) {
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var sid *windows.SID
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err := windows.AllocateAndInitializeSid(&windows.SECURITY_NT_AUTHORITY,
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1, subAuth0, 0, 0, 0, 0, 0, 0, 0, &sid)
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if err != nil {
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return nil, err
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}
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return sid, nil
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}
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// IsAnInteractiveSession determines if calling process is running interactively.
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// It queries the process token for membership in the Interactive group.
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// http://stackoverflow.com/questions/2668851/how-do-i-detect-that-my-application-is-running-as-service-or-in-an-interactive-s
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//
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// Deprecated: Use IsWindowsService instead.
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func IsAnInteractiveSession() (bool, error) {
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interSid, err := allocSid(windows.SECURITY_INTERACTIVE_RID)
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if err != nil {
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return false, err
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}
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defer windows.FreeSid(interSid)
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serviceSid, err := allocSid(windows.SECURITY_SERVICE_RID)
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if err != nil {
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return false, err
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}
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defer windows.FreeSid(serviceSid)
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t, err := windows.OpenCurrentProcessToken()
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if err != nil {
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return false, err
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}
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defer t.Close()
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gs, err := t.GetTokenGroups()
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if err != nil {
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return false, err
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}
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for _, g := range gs.AllGroups() {
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if windows.EqualSid(g.Sid, interSid) {
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return true, nil
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}
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if windows.EqualSid(g.Sid, serviceSid) {
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return false, nil
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}
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}
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return false, nil
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}
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// IsWindowsService reports whether the process is currently executing
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// as a Windows service.
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func IsWindowsService() (bool, error) {
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// The below technique looks a bit hairy, but it's actually
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// exactly what the .NET framework does for the similarly named function:
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// https://github.com/dotnet/extensions/blob/f4066026ca06984b07e90e61a6390ac38152ba93/src/Hosting/WindowsServices/src/WindowsServiceHelpers.cs#L26-L31
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// Specifically, it looks up whether the parent process has session ID zero
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// and is called "services".
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var pbi windows.PROCESS_BASIC_INFORMATION
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pbiLen := uint32(unsafe.Sizeof(pbi))
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err := windows.NtQueryInformationProcess(windows.CurrentProcess(), windows.ProcessBasicInformation, unsafe.Pointer(&pbi), pbiLen, &pbiLen)
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if err != nil {
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return false, err
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}
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var psid uint32
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err = windows.ProcessIdToSessionId(uint32(pbi.InheritedFromUniqueProcessId), &psid)
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if err != nil || psid != 0 {
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return false, nil
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}
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pproc, err := windows.OpenProcess(windows.PROCESS_QUERY_LIMITED_INFORMATION, false, uint32(pbi.InheritedFromUniqueProcessId))
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if err != nil {
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return false, err
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}
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defer windows.CloseHandle(pproc)
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var exeNameBuf [261]uint16
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exeNameLen := uint32(len(exeNameBuf) - 1)
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err = windows.QueryFullProcessImageName(pproc, 0, &exeNameBuf[0], &exeNameLen)
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if err != nil {
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return false, err
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}
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exeName := windows.UTF16ToString(exeNameBuf[:exeNameLen])
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if !strings.EqualFold(filepath.Base(exeName), "services.exe") {
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return false, nil
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}
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system32, err := windows.GetSystemDirectory()
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if err != nil {
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return false, err
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}
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targetExeName := filepath.Join(system32, "services.exe")
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return strings.EqualFold(exeName, targetExeName), nil
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}
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