Add a regenerate button to regenerate the password in Windows.

rlz/win/lib/machine_id_win.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include <windows.h>
-#include <Sddl.h>  // For ConvertSidToStringSidW.
-#include <string>
-
-#include "base/memory/scoped_ptr.h"
-#include "base/string16.h"
-#include "rlz/lib/assert.h"
-
-namespace rlz_lib {
-
-namespace {
-
-bool GetSystemVolumeSerialNumber(int* number) {
-  if (!number)
-    return false;
-
-  *number = 0;
-
-  // Find the system root path (e.g: C:\).
-  wchar_t system_path[MAX_PATH + 1];
-  if (!GetSystemDirectoryW(system_path, MAX_PATH))
-    return false;
-
-  wchar_t* first_slash = wcspbrk(system_path, L"\\/");
-  if (first_slash != NULL)
-    *(first_slash + 1) = 0;
-
-  DWORD number_local = 0;
-  if (!GetVolumeInformationW(system_path, NULL, 0, &number_local, NULL, NULL,
-                             NULL, 0))
-    return false;
-
-  *number = number_local;
-  return true;
-}
-
-bool GetComputerSid(const wchar_t* account_name, SID* sid, DWORD sid_size) {
-  static const DWORD kStartDomainLength = 128;  // reasonable to start with
-
-  scoped_array<wchar_t> domain_buffer(new wchar_t[kStartDomainLength]);
-  DWORD domain_size = kStartDomainLength;
-  DWORD sid_dword_size = sid_size;
-  SID_NAME_USE sid_name_use;
-
-  BOOL success = ::LookupAccountNameW(NULL, account_name, sid,
-                                      &sid_dword_size, domain_buffer.get(),
-                                      &domain_size, &sid_name_use);
-  if (!success && ::GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
-    // We could have gotten the insufficient buffer error because
-    // one or both of sid and szDomain was too small. Check for that
-    // here.
-    if (sid_dword_size > sid_size)
-      return false;
-
-    if (domain_size > kStartDomainLength)
-      domain_buffer.reset(new wchar_t[domain_size]);
-
-    success = ::LookupAccountNameW(NULL, account_name, sid, &sid_dword_size,
-                                   domain_buffer.get(), &domain_size,
-                                   &sid_name_use);
-  }
-
-  return success != FALSE;
-}
-
-std::wstring ConvertSidToString(SID* sid) {
-  std::wstring sid_string;
-#if _WIN32_WINNT >= 0x500
-  wchar_t* sid_buffer = NULL;
-  if (ConvertSidToStringSidW(sid, &sid_buffer)) {
-    sid_string = sid_buffer;
-    LocalFree(sid_buffer);
-  }
-#else
-  SID_IDENTIFIER_AUTHORITY* sia = ::GetSidIdentifierAuthority(sid);
-
-  if(sia->Value[0] || sia->Value[1]) {
-    base::SStringPrintf(
-        &sid_string, L"S-%d-0x%02hx%02hx%02hx%02hx%02hx%02hx",
-        SID_REVISION, (USHORT)sia->Value[0], (USHORT)sia->Value[1],
-        (USHORT)sia->Value[2], (USHORT)sia->Value[3], (USHORT)sia->Value[4],
-        (USHORT)sia->Value[5]);
-  } else {
-    ULONG authority = 0;
-    for (int i = 2; i < 6; ++i) {
-      authority <<= 8;
-      authority |= sia->Value[i];
-    }
-    base::SStringPrintf(&sid_string, L"S-%d-%lu", SID_REVISION, authority);
-  }
-
-  int sub_auth_count = *::GetSidSubAuthorityCount(sid);
-  for(int i = 0; i < sub_auth_count; ++i)
-    base::StringAppendF(&sid_string, L"-%lu", *::GetSidSubAuthority(sid, i));
-#endif
-
-  return sid_string;
-}
-
-}  // namespace
-
-bool GetRawMachineId(string16* sid_string, int* volume_id) {
-  // Calculate the Windows SID.
-
-  wchar_t computer_name[MAX_COMPUTERNAME_LENGTH + 1] = {0};
-  DWORD size = arraysize(computer_name);
-
-  if (GetComputerNameW(computer_name, &size)) {
-    char sid_buffer[SECURITY_MAX_SID_SIZE];
-    SID* sid = reinterpret_cast<SID*>(sid_buffer);
-    if (GetComputerSid(computer_name, sid, SECURITY_MAX_SID_SIZE)) {
-      *sid_string = ConvertSidToString(sid);
-    }
-  }
-
-  // Get the system drive volume serial number.
-  *volume_id = 0;
-  if (!GetSystemVolumeSerialNumber(volume_id)) {
-    ASSERT_STRING("GetMachineId: Failed to retrieve volume serial number");
-    *volume_id = 0;
-  }
-
-  return true;
-}
-
-}  // namespace rlz_lib