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// Copyright 2014 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/incident_reporting/binary_integrity_analyzer.h"
#include "base/bind.h"
#include "base/files/file_util.h"
#include "base/files/scoped_temp_dir.h"
#include "base/memory/scoped_ptr.h"
#include "base/path_service.h"
#include "base/test/scoped_path_override.h"
#include "chrome/browser/safe_browsing/incident_reporting/incident.h"
#include "chrome/browser/safe_browsing/incident_reporting/mock_incident_receiver.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/safe_browsing/csd.pb.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "version.h" // NOLINT
using ::testing::_;
using ::testing::StrictMock;
namespace safe_browsing {
namespace {
const wchar_t kChromeDll[] = L"chrome.dll";
const wchar_t kChromeChildDll[] = L"chrome_child.dll";
const wchar_t kChromeElfDll[] = L"chrome_elf.dll";
const wchar_t kChromeExe[] = L"chrome.exe";
const wchar_t kSignedBinaryDll[] = L"signed_binary.dll";
// Helper function to erase the content of a binary to make sure the signature
// verification will fail.
bool EraseFileContent(const base::FilePath& file_path) {
FILE* file = base::OpenFile(file_path, "w");
if (file == NULL)
return false;
bool success = base::TruncateFile(file);
return base::CloseFile(file) && success;
}
} // namespace
class BinaryIntegrityAnalyzerWinTest : public ::testing::Test {
public:
BinaryIntegrityAnalyzerWinTest();
protected:
base::FilePath test_data_dir_;
base::ScopedTempDir temp_dir_;
scoped_ptr<base::ScopedPathOverride> exe_dir_override_;
};
BinaryIntegrityAnalyzerWinTest::BinaryIntegrityAnalyzerWinTest() {
EXPECT_TRUE(temp_dir_.CreateUniqueTempDir());
base::CreateDirectory(temp_dir_.path().AppendASCII(CHROME_VERSION_STRING));
// We retrieve DIR_TEST_DATA here because it is based on DIR_EXE and we are
// about to override the path to the latter.
if (!PathService::Get(chrome::DIR_TEST_DATA, &test_data_dir_))
NOTREACHED();
exe_dir_override_.reset(
new base::ScopedPathOverride(base::DIR_EXE, temp_dir_.path()));
}
TEST_F(BinaryIntegrityAnalyzerWinTest, GetCriticalBinariesPath) {
// Expected paths.
std::vector<base::FilePath> critical_binaries_path_expected;
critical_binaries_path_expected.push_back(
temp_dir_.path().Append(kChromeExe));
critical_binaries_path_expected.push_back(
temp_dir_.path().AppendASCII(CHROME_VERSION_STRING).Append(kChromeDll));
critical_binaries_path_expected.push_back(
temp_dir_.path().AppendASCII(CHROME_VERSION_STRING).Append(
kChromeChildDll));
critical_binaries_path_expected.push_back(
temp_dir_.path().AppendASCII(CHROME_VERSION_STRING).Append(
kChromeElfDll));
std::vector<base::FilePath> critical_binaries_path =
GetCriticalBinariesPath();
ASSERT_THAT(critical_binaries_path,
::testing::ContainerEq(critical_binaries_path_expected));
}
TEST_F(BinaryIntegrityAnalyzerWinTest, VerifyBinaryIntegrity) {
// Copy the signed dll to the temp exe directory.
base::FilePath signed_binary_path(test_data_dir_);
signed_binary_path =
signed_binary_path.Append(L"safe_browsing").Append(kSignedBinaryDll);
base::FilePath chrome_elf_path(temp_dir_.path());
chrome_elf_path =
chrome_elf_path.Append(TEXT(CHROME_VERSION_STRING)).Append(kChromeElfDll);
ASSERT_TRUE(base::CopyFile(signed_binary_path, chrome_elf_path));
// Run check on an integral binary.
scoped_ptr<MockIncidentReceiver> mock_receiver(
new StrictMock<MockIncidentReceiver>());
scoped_ptr<Incident> incident_to_clear;
EXPECT_CALL(*mock_receiver, DoClearIncidentForProcess(_))
.WillOnce(TakeIncident(&incident_to_clear));
VerifyBinaryIntegrity(mock_receiver.Pass());
ASSERT_TRUE(incident_to_clear);
ASSERT_EQ(IncidentType::BINARY_INTEGRITY, incident_to_clear->GetType());
// Run check on an infected binary.
ASSERT_TRUE(EraseFileContent(chrome_elf_path));
mock_receiver.reset(new StrictMock<MockIncidentReceiver>());
scoped_ptr<Incident> incident;
EXPECT_CALL(*mock_receiver, DoAddIncidentForProcess(_))
.WillOnce(TakeIncident(&incident));
VerifyBinaryIntegrity(mock_receiver.Pass());
// Verify that the cleared and reported incidents have the same key.
ASSERT_EQ(incident->GetKey(), incident_to_clear->GetKey());
// Verify that the incident report contains the expected data.
scoped_ptr<ClientIncidentReport_IncidentData> incident_data(
incident->TakePayload());
ASSERT_TRUE(incident_data->has_binary_integrity());
ASSERT_TRUE(incident_data->binary_integrity().has_file_basename());
ASSERT_EQ("chrome_elf.dll",
incident_data->binary_integrity().file_basename());
ASSERT_TRUE(incident_data->binary_integrity().has_signature());
}
} // namespace safe_browsing
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