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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
#include "WinTokenUtils.h"
#include "nsWindowsHelpers.h"
using namespace mozilla;
// If |aToken| is nullptr, CheckTokenMembership uses the calling thread's
// primary token to check membership for.
static LauncherResult<bool> IsMemberOfAdministrators(
const nsAutoHandle& aToken) {
BYTE adminsGroupSid[SECURITY_MAX_SID_SIZE];
DWORD adminsGroupSidSize = sizeof(adminsGroupSid);
if (!CreateWellKnownSid(WinBuiltinAdministratorsSid, nullptr, adminsGroupSid,
&adminsGroupSidSize)) {
return LAUNCHER_ERROR_FROM_LAST();
}
BOOL isMember;
if (!CheckTokenMembership(aToken, adminsGroupSid, &isMember)) {
return LAUNCHER_ERROR_FROM_LAST();
}
return !!isMember;
}
static LauncherResult<bool> IsUacEnabled() {
DWORD len = sizeof(DWORD);
DWORD value;
LSTATUS status = RegGetValueW(
HKEY_LOCAL_MACHINE,
L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System",
L"EnableLUA", RRF_RT_DWORD, nullptr, &value, &len);
if (status != ERROR_SUCCESS) {
return LAUNCHER_ERROR_FROM_WIN32(status);
}
// UAC is disabled only when EnableLUA is 0.
return (value != 0);
}
namespace mozilla {
LauncherResult<bool> IsAdminWithoutUac() {
// To check whether the process was launched with Administrator priviledges
// or not, we cannot simply check the integrity level of the current process
// because the launcher process spawns the browser process with the medium
// integrity level even though the launcher process is high integrity level.
// We check whether the thread's token contains Administratos SID or not
// instead.
LauncherResult<bool> containsAdminGroup =
IsMemberOfAdministrators(nsAutoHandle());
if (containsAdminGroup.isErr()) {
return containsAdminGroup.propagateErr();
}
if (!containsAdminGroup.unwrap()) {
return false;
}
LauncherResult<bool> isUacEnabled = IsUacEnabled();
if (isUacEnabled.isErr()) {
return isUacEnabled.propagateErr();
}
return !isUacEnabled.unwrap();
}
} // namespace mozilla