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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/browser/win/conflicts/module_info_util.h"
#include <windows.h>
#include <memory>
#include <optional>
#include <string>
#include "base/base_paths.h"
#include "base/compiler_specific.h"
#include "base/environment.h"
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_temp_dir.h"
#include "base/path_service.h"
#include "base/scoped_environment_variable_override.h"
#include "base/scoped_native_library.h"
#include "base/strings/utf_string_conversions.h"
#include "base/win/pe_image.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
// Creates a truncated copy of the current executable at |location| path to
// mimic a module with an invalid NT header.
bool CreateTruncatedModule(const base::FilePath& location) {
base::FilePath file_exe_path;
if (!base::PathService::Get(base::FILE_EXE, &file_exe_path))
return false;
base::File file_exe(file_exe_path,
base::File::FLAG_OPEN | base::File::FLAG_READ);
if (!file_exe.IsValid())
return false;
const size_t kSizeOfTruncatedDll = 256;
char buffer[kSizeOfTruncatedDll];
if (UNSAFE_TODO(file_exe.Read(0, buffer, kSizeOfTruncatedDll)) !=
kSizeOfTruncatedDll) {
return false;
}
base::File target_file(location,
base::File::FLAG_CREATE | base::File::FLAG_WRITE);
if (!target_file.IsValid())
return false;
return UNSAFE_TODO(target_file.Write(0, buffer, kSizeOfTruncatedDll)) ==
kSizeOfTruncatedDll;
}
} // namespace
TEST(ModuleInfoUtilTest, GetCertificateInfoUnsigned) {
base::FilePath path;
ASSERT_TRUE(base::PathService::Get(base::FILE_EXE, &path));
CertificateInfo cert_info;
GetCertificateInfo(path, &cert_info);
EXPECT_EQ(CertificateInfo::Type::NO_CERTIFICATE, cert_info.type);
EXPECT_TRUE(cert_info.path.empty());
EXPECT_TRUE(cert_info.subject.empty());
}
TEST(ModuleInfoUtilTest, GetCertificateInfoSigned) {
std::unique_ptr<base::Environment> env = base::Environment::Create();
std::optional<std::string> sysroot = env->GetVar("SYSTEMROOT");
ASSERT_TRUE(sysroot.has_value());
base::FilePath path = base::FilePath::FromUTF8Unsafe(sysroot.value())
.Append(L"system32\\kernel32.dll");
CertificateInfo cert_info;
GetCertificateInfo(path, &cert_info);
EXPECT_NE(CertificateInfo::Type::NO_CERTIFICATE, cert_info.type);
EXPECT_FALSE(cert_info.path.empty());
EXPECT_FALSE(cert_info.subject.empty());
}
TEST(ModuleInfoUtilTest, GetEnvironmentVariablesMapping) {
base::ScopedEnvironmentVariableOverride scoped_override("foo", "C:\\bar\\");
// The mapping for these variables will be retrieved.
std::vector<std::wstring> environment_variables = {
L"foo",
L"SYSTEMROOT",
};
StringMapping string_mapping =
GetEnvironmentVariablesMapping(environment_variables);
ASSERT_EQ(2u, string_mapping.size());
EXPECT_EQ(u"c:\\bar", string_mapping[0].first);
EXPECT_EQ(u"%foo%", string_mapping[0].second);
EXPECT_FALSE(string_mapping[1].second.empty());
}
const struct CollapsePathList {
std::u16string expected_result;
std::u16string path;
} kCollapsePathList[] = {
// Negative testing (should not collapse this path).
{u"c:\\a\\a.dll", u"c:\\a\\a.dll"},
// These two are to test that we select the maximum collapsed path.
{u"%foo%\\a.dll", u"c:\\foo\\a.dll"},
{u"%x%\\a.dll", u"c:\\foo\\bar\\a.dll"},
// Tests that only full path components are collapsed.
{u"c:\\foo_bar\\a.dll", u"c:\\foo_bar\\a.dll"},
};
TEST(ModuleInfoUtilTest, CollapseMatchingPrefixInPath) {
StringMapping string_mapping = {
std::make_pair(u"c:\\foo", u"%foo%"),
std::make_pair(u"c:\\foo\\bar", u"%x%"),
};
for (const auto& test_case : kCollapsePathList) {
std::u16string path = test_case.path;
CollapseMatchingPrefixInPath(string_mapping, &path);
EXPECT_EQ(test_case.expected_result, path);
}
}
// Tests that GetModuleImageSizeAndTimeDateStamp() returns the same information
// from a module that has been loaded in memory.
TEST(ModuleInfoUtilTest, GetModuleImageSizeAndTimeDateStamp) {
// Use the current exe file as an arbitrary module that exists.
base::FilePath file_exe;
ASSERT_TRUE(base::PathService::Get(base::FILE_EXE, &file_exe));
// Read the values from the loaded module.
base::ScopedNativeLibrary scoped_loaded_module(file_exe);
base::win::PEImage pe_image(scoped_loaded_module.get());
IMAGE_NT_HEADERS* nt_headers = pe_image.GetNTHeaders();
// Read the values from the module on disk.
uint32_t size_of_image = 0;
uint32_t time_date_stamp = 0;
EXPECT_TRUE(GetModuleImageSizeAndTimeDateStamp(file_exe, &size_of_image,
&time_date_stamp));
EXPECT_EQ(nt_headers->OptionalHeader.SizeOfImage, size_of_image);
EXPECT_EQ(nt_headers->FileHeader.TimeDateStamp, time_date_stamp);
}
TEST(ModuleInfoUtilTest, NonexistentDll) {
base::ScopedTempDir scoped_temp_dir;
EXPECT_TRUE(scoped_temp_dir.CreateUniqueTempDir());
base::FilePath nonexistant_dll =
scoped_temp_dir.GetPath().Append(L"nonexistant.dll");
uint32_t size_of_image = 0;
uint32_t time_date_stamp = 0;
EXPECT_FALSE(GetModuleImageSizeAndTimeDateStamp(
nonexistant_dll, &size_of_image, &time_date_stamp));
}
TEST(ModuleInfoUtilTest, InvalidNTHeader) {
base::ScopedTempDir scoped_temp_dir;
EXPECT_TRUE(scoped_temp_dir.CreateUniqueTempDir());
base::FilePath invalid_dll =
scoped_temp_dir.GetPath().Append(L"truncated.dll");
ASSERT_TRUE(CreateTruncatedModule(invalid_dll));
uint32_t size_of_image = 0;
uint32_t time_date_stamp = 0;
EXPECT_FALSE(GetModuleImageSizeAndTimeDateStamp(invalid_dll, &size_of_image,
&time_date_stamp));
}
TEST(ModuleInfoUtilTest, NormalizeCertificateSubject) {
std::wstring test_case = std::wstring(L"signer\0", 7);
EXPECT_EQ(7u, test_case.length());
std::wstring expected = L"signer";
internal::NormalizeCertificateSubject(&test_case);
EXPECT_EQ(test_case, expected);
}
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