tailscale/util/pidowner/pidowner_windows.go

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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package pidowner
import (
"fmt"
"syscall"
"golang.org/x/sys/windows"
)
func ownerOfPID(pid int) (userID string, err error) {
procHnd, err := windows.OpenProcess(windows.PROCESS_QUERY_INFORMATION, false, uint32(pid))
if err == syscall.Errno(0x57) { // invalid parameter, for PIDs that don't exist
return "", ErrProcessNotFound
}
if err != nil {
return "", fmt.Errorf("OpenProcess: %T %#v", err, err)
}
defer windows.CloseHandle(procHnd)
var tok windows.Token
if err := windows.OpenProcessToken(procHnd, windows.TOKEN_QUERY, &tok); err != nil {
return "", fmt.Errorf("OpenProcessToken: %w", err)
}
tokUser, err := tok.GetTokenUser()
if err != nil {
return "", fmt.Errorf("GetTokenUser: %w", err)
}
sid := tokUser.User.Sid
return sid.String(), nil
}