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windows: add various functions for shutting down and logging out

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There are a few functions to control the behavior of shutdown and
logout, both for what the current process does during shutdown, and also
whether or not the current process is running in an interactive session.
The below code is a port of the MSDN example code to Go using one of the
added new functions:

https://docs.microsoft.com/en-us/windows/win32/shutdown/how-to-shut-down-the-system

func shutdownLikeMSDNDoes() error {
  seShutdownName, err := windows.UTF16PtrFromString("SeShutdownPrivilege")
  if err != nil {
    return err
  }

  var shutdownPriv windows.Tokenprivileges
  err = windows.LookupPrivilegeValue(nil, seShutdownName, &shutdownPriv.Privileges[0].Luid)
  if err != nil {
    return err
  }
  shutdownPriv.Privileges[0].Attributes = windows.SE_PRIVILEGE_ENABLED
  shutdownPriv.PrivilegeCount = 1

  process, err := windows.GetCurrentProcess()
  if err != nil {
    return err
  }
  var token windows.Token
  err = windows.OpenProcessToken(process, windows.TOKEN_ADJUST_PRIVILEGES | windows.TOKEN_QUERY, &token)
  if err != nil {
    return err
  }
  defer token.Close()

  err = windows.AdjustTokenPrivileges(token, false, &shutdownPriv, 0, nil, nil)
  if err != nil {
    return err
  }

  err = windows.ExitWindowsEx(windows.EWX_SHUTDOWN | windows.EWX_FORCE,
    windows.SHTDN_REASON_MAJOR_OPERATINGSYSTEM | windows.SHTDN_REASON_MINOR_UPGRADE | windows.SHTDN_REASON_FLAG_PLANNED)
  if err != nil {
    return err
  }

  return nil
}

Note, though, that this function doesn't set the token privs back to how
they were before, which isn't good. A more robust method than the MSDN
one above would be to duplicate&impersonate.

Fixes: golang/go#34271
Change-Id: Ibe55ddd35b709d9ab793cb9af47c39901c5e5c69
Reviewed-on: https://go-review.googlesource.com/c/sys/+/195497
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bruce Downs <bruceadowns@gmail.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
This commit is contained in:
Jason A. Donenfeld
2019-09-16 16:59:10 +00:00
parent 1a3b71a79e
commit 8a69140bde
3 changed files with 133 additions and 0 deletions
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windows/syscall_windows.go
+4
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@@ -296,6 +296,10 @@ func NewCallbackCDecl(fn interface{}) uintptr {
//sys SetVolumeLabel(rootPathName *uint16, volumeName *uint16) (err error) = SetVolumeLabelW
//sys SetVolumeMountPoint(volumeMountPoint *uint16, volumeName *uint16) (err error) = SetVolumeMountPointW
//sys MessageBox(hwnd Handle, text *uint16, caption *uint16, boxtype uint32) (ret int32, err error) [failretval==0] = user32.MessageBoxW
//sys ExitWindowsEx(flags uint32, reason uint32) (err error) = user32.ExitWindowsEx
//sys InitiateSystemShutdownEx(machineName *uint16, message *uint16, timeout uint32, forceAppsClosed bool, rebootAfterShutdown bool, reason uint32) (err error) = advapi32.InitiateSystemShutdownExW
//sys SetProcessShutdownParameters(level uint32, flags uint32) (err error) = kernel32.SetProcessShutdownParameters
//sys GetProcessShutdownParameters(level *uint32, flags *uint32) (err error) = kernel32.GetProcessShutdownParameters
//sys clsidFromString(lpsz *uint16, pclsid *GUID) (ret error) = ole32.CLSIDFromString
//sys stringFromGUID2(rguid *GUID, lpsz *uint16, cchMax int32) (chars int32) = ole32.StringFromGUID2
//sys coCreateGuid(pguid *GUID) (ret error) = ole32.CoCreateGuid