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[bytom/vapor.git] / vendor / golang.org / x / sys / windows / svc / security.go
1 // Copyright 2012 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 // +build windows
6
7 package svc
8
9 import (
10         "unsafe"
11
12         "golang.org/x/sys/windows"
13 )
14
15 func allocSid(subAuth0 uint32) (*windows.SID, error) {
16         var sid *windows.SID
17         err := windows.AllocateAndInitializeSid(&windows.SECURITY_NT_AUTHORITY,
18                 1, subAuth0, 0, 0, 0, 0, 0, 0, 0, &sid)
19         if err != nil {
20                 return nil, err
21         }
22         return sid, nil
23 }
24
25 // IsAnInteractiveSession determines if calling process is running interactively.
26 // It queries the process token for membership in the Interactive group.
27 // http://stackoverflow.com/questions/2668851/how-do-i-detect-that-my-application-is-running-as-service-or-in-an-interactive-s
28 func IsAnInteractiveSession() (bool, error) {
29         interSid, err := allocSid(windows.SECURITY_INTERACTIVE_RID)
30         if err != nil {
31                 return false, err
32         }
33         defer windows.FreeSid(interSid)
34
35         serviceSid, err := allocSid(windows.SECURITY_SERVICE_RID)
36         if err != nil {
37                 return false, err
38         }
39         defer windows.FreeSid(serviceSid)
40
41         t, err := windows.OpenCurrentProcessToken()
42         if err != nil {
43                 return false, err
44         }
45         defer t.Close()
46
47         gs, err := t.GetTokenGroups()
48         if err != nil {
49                 return false, err
50         }
51         p := unsafe.Pointer(&gs.Groups[0])
52         groups := (*[2 << 20]windows.SIDAndAttributes)(p)[:gs.GroupCount]
53         for _, g := range groups {
54                 if windows.EqualSid(g.Sid, interSid) {
55                         return true, nil
56                 }
57                 if windows.EqualSid(g.Sid, serviceSid) {
58                         return false, nil
59                 }
60         }
61         return false, nil
62 }