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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/chrome_elf/third_party_dlls/main.h"
#include <windows.h>
#include <assert.h>
#include <versionhelpers.h>
#include <limits>
#include "chrome/chrome_elf/nt_registry/nt_registry.h"
#include "chrome/chrome_elf/third_party_dlls/hook.h"
#include "chrome/chrome_elf/third_party_dlls/logs.h"
#include "chrome/chrome_elf/third_party_dlls/packed_list_file.h"
#include "chrome/chrome_elf/third_party_dlls/packed_list_format.h"
#include "chrome/chrome_elf/third_party_dlls/status_codes.h"
#include "chrome/install_static/install_util.h"
namespace third_party_dlls {
namespace {
// Record if all the third-party DLL management code was successfully
// initialized, so processes can easily determine if it is enabled for them.
bool g_third_party_initialized = false;
//------------------------------------------------------------------------------
// Private functions
//------------------------------------------------------------------------------
// Clear all status codes.
bool ResetStatusCodes() {
HANDLE key_handle = nullptr;
// If the ThirdParty registry key does not exist, it will be created now.
if (!nt::CreateRegKey(nt::HKCU,
install_static::GetRegistryPath()
.append(kThirdPartyRegKeyName)
.c_str(),
KEY_WRITE, &key_handle)) {
return false;
}
bool success = nt::SetRegKeyValue(key_handle, kStatusCodesRegValue,
REG_BINARY, nullptr, 0);
nt::CloseRegKey(key_handle);
return success;
}
// Store a status code for later consumption.
void AddStatusCode(ThirdPartyStatus code) {
HANDLE key_handle = nullptr;
if (!nt::CreateRegKey(nt::HKCU,
install_static::GetRegistryPath()
.append(kThirdPartyRegKeyName)
.c_str(),
KEY_WRITE | KEY_READ, &key_handle)) {
return;
}
std::vector<BYTE> value_bytes;
ULONG value_type = REG_NONE;
// Query for the existing value and sanity check any existing content.
// Note: If non-existent, or corrupt, carry on and overwrite.
if (!nt::QueryRegKeyValue(key_handle, kStatusCodesRegValue, &value_type,
&value_bytes) ||
value_type != REG_BINARY) {
value_bytes.clear();
}
AddStatusCodeToBuffer(code, &value_bytes);
assert(value_bytes.size() < std::numeric_limits<DWORD>::max());
nt::SetRegKeyValue(key_handle, kStatusCodesRegValue, REG_BINARY,
value_bytes.data(),
static_cast<DWORD>(value_bytes.size()));
nt::CloseRegKey(key_handle);
return;
}
} // namespace
//------------------------------------------------------------------------------
// Public defines & functions
//------------------------------------------------------------------------------
bool Init() {
// Debug check: Init should not be called more than once.
assert(!g_third_party_initialized);
// Sanity check: third_party_dlls should only be enabled in the browser
// process at this time.
if (!install_static::IsBrowserProcess())
return false;
// Zero tolerance for unsupported versions of Windows. Third-party control
// is too entwined with the operating system.
if (!::IsWindows7OrGreater())
return false;
if (!ResetStatusCodes())
AddStatusCode(ThirdPartyStatus::kStatusCodeResetFailure);
// 1) Initialize the blocklist from file
ThirdPartyStatus status = InitFromFile();
if (status != ThirdPartyStatus::kSuccess) {
AddStatusCode(status);
// A few status codes are considered acceptable here.
if (!IsStatusCodeSuccessful(status))
return false;
}
// 2) InitLogs
status = InitLogs();
if (status != ThirdPartyStatus::kSuccess) {
AddStatusCode(status);
DeinitFromFile();
return false;
}
// 3) Apply the hook only after everything else is successfully set up.
status = ApplyHook();
if (status != ThirdPartyStatus::kSuccess) {
AddStatusCode(status);
DeinitLogs();
DeinitFromFile();
return false;
}
// Record initialization.
g_third_party_initialized = true;
return true;
}
//------------------------------------------------------------------------------
// Testing-only access to status code APIs.
//------------------------------------------------------------------------------
bool ResetStatusCodesForTesting() {
return ResetStatusCodes();
}
void AddStatusCodeForTesting(ThirdPartyStatus code) {
AddStatusCode(code);
}
} // namespace third_party_dlls
bool IsThirdPartyInitialized() {
return third_party_dlls::g_third_party_initialized;
}
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