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security.go
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security.go
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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.
// +build windows
package svc
import (
"syscall"
"unsafe"
"github.com/conseweb/winsvc/winapi"
)
// TODO(brainman): move some of that code to syscall/security.go
// getInfo retrieves a specified type of information about an access token.
func getInfo(t syscall.Token, class uint32, initSize int) (unsafe.Pointer, error) {
b := make([]byte, initSize)
var n uint32
e := syscall.GetTokenInformation(t, class, &b[0], uint32(len(b)), &n)
if e != nil {
if e != syscall.ERROR_INSUFFICIENT_BUFFER {
return nil, e
}
// make receive buffers of requested size and try again
b = make([]byte, n)
e = syscall.GetTokenInformation(t, class, &b[0], uint32(len(b)), &n)
if e != nil {
return nil, e
}
}
return unsafe.Pointer(&b[0]), nil
}
// getTokenUser retrieves access token t user account information.
func getTokenGroups(t syscall.Token) (*winapi.Tokengroups, error) {
i, e := getInfo(t, syscall.TokenGroups, 50)
if e != nil {
return nil, e
}
return (*winapi.Tokengroups)(i), nil
}
func allocSid(subAuth0 uint32) (*syscall.SID, error) {
var sid *syscall.SID
err := winapi.AllocateAndInitializeSid(&winapi.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
func IsAnInteractiveSession() (bool, error) {
interSid, err := allocSid(winapi.SECURITY_INTERACTIVE_RID)
if err != nil {
return false, err
}
defer winapi.FreeSid(interSid)
serviceSid, err := allocSid(winapi.SECURITY_SERVICE_RID)
if err != nil {
return false, err
}
defer winapi.FreeSid(serviceSid)
t, err := syscall.OpenCurrentProcessToken()
if err != nil {
return false, err
}
defer t.Close()
gs, err := getTokenGroups(t)
if err != nil {
return false, err
}
p := unsafe.Pointer(&gs.Groups[0])
groups := (*[256]syscall.SIDAndAttributes)(p)[:gs.GroupCount]
for _, g := range groups {
if winapi.EqualSid(g.Sid, interSid) {
return true, nil
}
if winapi.EqualSid(g.Sid, serviceSid) {
return false, nil
}
}
return false, nil
}
// IsAnIinteractiveSession is a misspelled version of IsAnInteractiveSession.
// Do not use. It is kept here so we do not break existing code.
func IsAnIinteractiveSession() (bool, error) {
return IsAnInteractiveSession()
}