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// Copyright (c) 2011 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 "chrome/browser/safe_browsing/signature_util.h"
#include <windows.h>
#include <softpub.h>
#include <wintrust.h>
#include "base/file_path.h"
#include "base/logging.h"
#include "chrome/common/safe_browsing/csd.pb.h"
#pragma comment(lib, "wintrust.lib")
namespace safe_browsing {
SignatureUtil::SignatureUtil() {}
SignatureUtil::~SignatureUtil() {}
void SignatureUtil::CheckSignature(
const base::FilePath& file_path,
ClientDownloadRequest_SignatureInfo* signature_info) {
VLOG(2) << "Checking signature for " << file_path.value();
WINTRUST_FILE_INFO file_info = {0};
file_info.cbStruct = sizeof(file_info);
file_info.pcwszFilePath = file_path.value().c_str();
file_info.hFile = NULL;
file_info.pgKnownSubject = NULL;
WINTRUST_DATA wintrust_data = {0};
wintrust_data.cbStruct = sizeof(wintrust_data);
wintrust_data.pPolicyCallbackData = NULL;
wintrust_data.pSIPClientData = NULL;
wintrust_data.dwUIChoice = WTD_UI_NONE;
wintrust_data.fdwRevocationChecks = WTD_REVOKE_NONE;
wintrust_data.dwUnionChoice = WTD_CHOICE_FILE;
wintrust_data.pFile = &file_info;
wintrust_data.dwStateAction = WTD_STATEACTION_VERIFY;
wintrust_data.hWVTStateData = NULL;
wintrust_data.pwszURLReference = NULL;
// Disallow revocation checks over the network.
wintrust_data.dwProvFlags = WTD_CACHE_ONLY_URL_RETRIEVAL;
wintrust_data.dwUIContext = WTD_UICONTEXT_EXECUTE;
// The WINTRUST_ACTION_GENERIC_VERIFY_V2 policy verifies that the certificate
// chains up to a trusted root CA, and that it has appropriate permission to
// sign code.
GUID policy_guid = WINTRUST_ACTION_GENERIC_VERIFY_V2;
LONG result = WinVerifyTrust(static_cast<HWND>(INVALID_HANDLE_VALUE),
&policy_guid,
&wintrust_data);
CRYPT_PROVIDER_DATA* prov_data = WTHelperProvDataFromStateData(
wintrust_data.hWVTStateData);
if (prov_data) {
if (prov_data->csSigners > 0) {
signature_info->set_trusted(result == ERROR_SUCCESS);
}
for (DWORD i = 0; i < prov_data->csSigners; ++i) {
const CERT_CHAIN_CONTEXT* cert_chain_context =
prov_data->pasSigners[i].pChainContext;
if (!cert_chain_context)
break;
for (DWORD j = 0; j < cert_chain_context->cChain; ++j) {
CERT_SIMPLE_CHAIN* simple_chain = cert_chain_context->rgpChain[j];
ClientDownloadRequest_CertificateChain* chain =
signature_info->add_certificate_chain();
if (!simple_chain)
break;
for (DWORD k = 0; k < simple_chain->cElement; ++k) {
CERT_CHAIN_ELEMENT* element = simple_chain->rgpElement[k];
chain->add_element()->set_certificate(
element->pCertContext->pbCertEncoded,
element->pCertContext->cbCertEncoded);
}
}
}
// Free the provider data.
wintrust_data.dwStateAction = WTD_STATEACTION_CLOSE;
WinVerifyTrust(static_cast<HWND>(INVALID_HANDLE_VALUE),
&policy_guid, &wintrust_data);
}
}
} // namespace safe_browsing
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