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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 http://mozilla.org/MPL/2.0/. */
#include "mozilla/mscom/MainThreadRuntime.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/Assertions.h"
#include "mozilla/RefPtr.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/WindowsVersion.h"
#include "nsDebug.h"
#include "nsWindowsHelpers.h"
#include <accctrl.h>
#include <aclapi.h>
#include <objbase.h>
#include <objidl.h>
namespace {
struct LocalFreeDeleter
{
void operator()(void* aPtr)
{
::LocalFree(aPtr);
}
};
} // anonymous namespace
namespace mozilla {
namespace mscom {
MainThreadRuntime::MainThreadRuntime()
: mInitResult(E_UNEXPECTED)
{
// We must be the outermost COM initialization on this thread. The COM runtime
// cannot be configured once we start manipulating objects
MOZ_ASSERT(mStaRegion.IsValidOutermost());
if (NS_WARN_IF(!mStaRegion.IsValidOutermost())) {
return;
}
// We are required to initialize security in order to configure global options.
mInitResult = InitializeSecurity();
MOZ_ASSERT(SUCCEEDED(mInitResult));
if (FAILED(mInitResult)) {
return;
}
RefPtr<IGlobalOptions> globalOpts;
mInitResult = ::CoCreateInstance(CLSID_GlobalOptions, nullptr,
CLSCTX_INPROC_SERVER, IID_IGlobalOptions,
(void**)getter_AddRefs(globalOpts));
MOZ_ASSERT(SUCCEEDED(mInitResult));
if (FAILED(mInitResult)) {
return;
}
// Use the strictest policy available.
ULONG_PTR exceptionSetting = COMGLB_EXCEPTION_DONOT_HANDLE_ANY;
mInitResult = globalOpts->Set(COMGLB_EXCEPTION_HANDLING, exceptionSetting);
MOZ_ASSERT(SUCCEEDED(mInitResult));
}
HRESULT
MainThreadRuntime::InitializeSecurity()
{
HANDLE rawToken = nullptr;
BOOL ok = ::OpenProcessToken(::GetCurrentProcess(), TOKEN_QUERY, &rawToken);
if (!ok) {
return HRESULT_FROM_WIN32(::GetLastError());
}
nsAutoHandle token(rawToken);
DWORD len = 0;
ok = ::GetTokenInformation(token, TokenUser, nullptr, len, &len);
DWORD win32Error = ::GetLastError();
if (!ok && win32Error != ERROR_INSUFFICIENT_BUFFER) {
return HRESULT_FROM_WIN32(win32Error);
}
auto tokenUserBuf = MakeUnique<BYTE[]>(len);
TOKEN_USER& tokenUser = *reinterpret_cast<TOKEN_USER*>(tokenUserBuf.get());
ok = ::GetTokenInformation(token, TokenUser, tokenUserBuf.get(), len, &len);
if (!ok) {
return HRESULT_FROM_WIN32(::GetLastError());
}
len = 0;
ok = ::GetTokenInformation(token, TokenPrimaryGroup, nullptr, len, &len);
win32Error = ::GetLastError();
if (!ok && win32Error != ERROR_INSUFFICIENT_BUFFER) {
return HRESULT_FROM_WIN32(win32Error);
}
auto tokenPrimaryGroupBuf = MakeUnique<BYTE[]>(len);
TOKEN_PRIMARY_GROUP& tokenPrimaryGroup =
*reinterpret_cast<TOKEN_PRIMARY_GROUP*>(tokenPrimaryGroupBuf.get());
ok = ::GetTokenInformation(token, TokenPrimaryGroup, tokenPrimaryGroupBuf.get(),
len, &len);
if (!ok) {
return HRESULT_FROM_WIN32(::GetLastError());
}
SECURITY_DESCRIPTOR sd;
if (!::InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION)) {
return HRESULT_FROM_WIN32(::GetLastError());
}
BYTE systemSid[SECURITY_MAX_SID_SIZE];
DWORD systemSidSize = sizeof(systemSid);
if (!::CreateWellKnownSid(WinLocalSystemSid, nullptr, systemSid,
&systemSidSize)) {
return HRESULT_FROM_WIN32(::GetLastError());
}
BYTE adminSid[SECURITY_MAX_SID_SIZE];
DWORD adminSidSize = sizeof(adminSid);
if (!::CreateWellKnownSid(WinBuiltinAdministratorsSid, nullptr, adminSid,
&adminSidSize)) {
return HRESULT_FROM_WIN32(::GetLastError());
}
// Grant access to SYSTEM, Administrators, and the user.
EXPLICIT_ACCESS entries[] = {
{COM_RIGHTS_EXECUTE, GRANT_ACCESS, NO_INHERITANCE,
{nullptr, NO_MULTIPLE_TRUSTEE, TRUSTEE_IS_SID, TRUSTEE_IS_USER,
reinterpret_cast<LPWSTR>(systemSid)}},
{COM_RIGHTS_EXECUTE, GRANT_ACCESS, NO_INHERITANCE,
{nullptr, NO_MULTIPLE_TRUSTEE, TRUSTEE_IS_SID, TRUSTEE_IS_WELL_KNOWN_GROUP,
reinterpret_cast<LPWSTR>(adminSid)}},
{COM_RIGHTS_EXECUTE, GRANT_ACCESS, NO_INHERITANCE,
{nullptr, NO_MULTIPLE_TRUSTEE, TRUSTEE_IS_SID, TRUSTEE_IS_USER,
reinterpret_cast<LPWSTR>(tokenUser.User.Sid)}}
};
PACL rawDacl = nullptr;
win32Error = ::SetEntriesInAcl(ArrayLength(entries), entries, nullptr,
&rawDacl);
if (win32Error != ERROR_SUCCESS) {
return HRESULT_FROM_WIN32(win32Error);
}
UniquePtr<ACL, LocalFreeDeleter> dacl(rawDacl);
if (!::SetSecurityDescriptorDacl(&sd, TRUE, dacl.get(), FALSE)) {
return HRESULT_FROM_WIN32(::GetLastError());
}
if (!::SetSecurityDescriptorOwner(&sd, tokenUser.User.Sid, FALSE)) {
return HRESULT_FROM_WIN32(::GetLastError());
}
if (!::SetSecurityDescriptorGroup(&sd, tokenPrimaryGroup.PrimaryGroup, FALSE)) {
return HRESULT_FROM_WIN32(::GetLastError());
}
return ::CoInitializeSecurity(&sd, -1, nullptr, nullptr,
RPC_C_AUTHN_LEVEL_DEFAULT,
RPC_C_IMP_LEVEL_IDENTIFY, nullptr, EOAC_NONE,
nullptr);
}
} // namespace mscom
} // namespace mozilla
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