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// Copyright 2020 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/safe_browsing/cloud_content_scanning/file_analysis_request.h"
#include "base/containers/span.h"
#include "base/files/file_util.h"
#include "base/files/scoped_temp_dir.h"
#include "base/functional/callback_helpers.h"
#include "base/path_service.h"
#include "base/run_loop.h"
#include "base/test/bind.h"
#include "base/test/gmock_callback_support.h"
#include "base/test/scoped_feature_list.h"
#include "base/test/task_environment.h"
#include "base/test/test_future.h"
#include "build/build_config.h"
#include "chrome/browser/enterprise/connectors/analysis/content_analysis_delegate.h"
#include "chrome/browser/enterprise/connectors/analysis/content_analysis_features.h"
#include "chrome/browser/enterprise/connectors/common.h"
#include "chrome/browser/safe_browsing/cloud_content_scanning/binary_upload_service.h"
#include "chrome/common/chrome_paths.h"
#include "components/enterprise/connectors/core/service_provider_config.h"
#include "components/enterprise/obfuscation/core/download_obfuscator.h"
#include "components/file_access/scoped_file_access.h"
#include "components/file_access/scoped_file_access_delegate.h"
#include "components/file_access/test/mock_scoped_file_access_delegate.h"
#include "content/public/test/browser_task_environment.h"
#include "content/public/test/test_utils.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace safe_browsing {
namespace {
// Helper to cast base::DoNothing.
BinaryUploadService::ContentAnalysisCallback DoNothingConnector() {
return base::DoNothing();
}
// The mime type detected for each file can vary based on the platform/builder,
// so helper functions are used to validate that at least the returned type is
// one of multiple values.
bool IsDocMimeType(const std::string& mime_type) {
static std::set<std::string> set = {
"application/msword", "text/plain",
// Large files can result in no mimetype being found.
""};
return set.count(mime_type);
}
bool IsZipMimeType(const std::string& mime_type) {
static std::set<std::string> set = {"application/zip",
"application/x-zip-compressed"};
return set.count(mime_type);
}
} // namespace
class FileAnalysisRequestTest : public testing::Test {
public:
FileAnalysisRequestTest() = default;
std::unique_ptr<FileAnalysisRequest> MakeRequest(base::FilePath path,
base::FilePath file_name,
bool delay_opening_file,
std::string mime_type = "",
bool is_obfuscated = false) {
enterprise_connectors::AnalysisSettings settings;
return std::make_unique<FileAnalysisRequest>(
settings, path, file_name, mime_type, delay_opening_file,
DoNothingConnector(), base::DoNothing(), is_obfuscated);
}
void GetResultsForFileContents(const std::string& file_contents,
BinaryUploadService::Result* out_result,
BinaryUploadService::Request::Data* out_data) {
base::ScopedTempDir temp_dir;
ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
base::FilePath file_path = temp_dir.GetPath().AppendASCII("normal.doc");
base::WriteFile(file_path, file_contents);
auto request = MakeRequest(file_path, file_path.BaseName(),
/*delay_opening_file*/ false);
base::test::TestFuture<BinaryUploadService::Result,
BinaryUploadService::Request::Data>
future;
request->GetRequestData(future.GetCallback());
*out_result = future.Get<BinaryUploadService::Result>();
*out_data = future.Get<BinaryUploadService::Request::Data>();
EXPECT_EQ(file_path, out_data->path);
EXPECT_TRUE(out_data->contents.empty());
}
private:
};
TEST_F(FileAnalysisRequestTest, InvalidFiles) {
base::test::TaskEnvironment task_environment;
base::ScopedTempDir temp_dir;
ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
{
// Non-existent files should return UNKNOWN and have no information set.
base::FilePath path = temp_dir.GetPath().AppendASCII("not_a_real.doc");
auto request =
MakeRequest(path, path.BaseName(), /*delay_opening_file*/ false);
base::test::TestFuture<BinaryUploadService::Result,
BinaryUploadService::Request::Data>
future;
request->GetRequestData(future.GetCallback());
auto [result, data] = future.Take();
EXPECT_EQ(result, BinaryUploadService::Result::UNKNOWN);
EXPECT_EQ(data.size, 0u);
EXPECT_TRUE(data.contents.empty());
EXPECT_TRUE(data.hash.empty());
EXPECT_TRUE(data.mime_type.empty());
}
{
// Directories should not be used as paths passed to GetFileSHA256Blocking,
// so they should return UNKNOWN and have no information set.
base::FilePath path = temp_dir.GetPath();
auto request =
MakeRequest(path, path.BaseName(), /*delay_opening_file*/ false);
base::test::TestFuture<BinaryUploadService::Result,
BinaryUploadService::Request::Data>
future;
request->GetRequestData(future.GetCallback());
auto [result, data] = future.Take();
EXPECT_EQ(result, BinaryUploadService::Result::UNKNOWN);
EXPECT_EQ(data.size, 0u);
EXPECT_TRUE(data.contents.empty());
EXPECT_TRUE(data.hash.empty());
EXPECT_TRUE(data.mime_type.empty());
}
{
// Empty files should return SUCCESS as they have no content to scan.
base::FilePath path = temp_dir.GetPath().AppendASCII("empty.doc");
base::File file(path, base::File::FLAG_CREATE | base::File::FLAG_WRITE);
auto request =
MakeRequest(path, path.BaseName(), /*delay_opening_file*/ false);
base::test::TestFuture<BinaryUploadService::Result,
BinaryUploadService::Request::Data>
future;
request->GetRequestData(future.GetCallback());
auto [result, data] = future.Take();
EXPECT_EQ(result, BinaryUploadService::Result::SUCCESS);
EXPECT_EQ(data.size, 0u);
EXPECT_TRUE(data.contents.empty());
EXPECT_TRUE(data.hash.empty());
EXPECT_TRUE(data.mime_type.empty());
}
}
TEST_F(FileAnalysisRequestTest, NormalFiles) {
base::test::TaskEnvironment task_environment;
BinaryUploadService::Result result;
BinaryUploadService::Request::Data data;
std::string normal_contents = "Normal file contents";
GetResultsForFileContents(normal_contents, &result, &data);
EXPECT_EQ(result, BinaryUploadService::Result::SUCCESS);
EXPECT_EQ(data.size, normal_contents.size());
EXPECT_TRUE(data.contents.empty());
// printf "Normal file contents" | sha256sum | tr '[:lower:]' '[:upper:]'
EXPECT_EQ(data.hash,
"29644C10BD036866FCFD2BDACFF340DB5DE47A90002D6AB0C42DE6A22C26158B");
EXPECT_TRUE(IsDocMimeType(data.mime_type))
<< data.mime_type << " is not an expected mimetype";
std::string long_contents =
std::string(BinaryUploadService::kMaxUploadSizeBytes, 'a');
GetResultsForFileContents(long_contents, &result, &data);
EXPECT_EQ(result, BinaryUploadService::Result::SUCCESS);
EXPECT_EQ(data.size, long_contents.size());
EXPECT_TRUE(data.contents.empty());
// python3 -c "print('a' * (50 * 1024 * 1024), end='')" | sha256sum | tr
// '[:lower:]' '[:upper:]'
EXPECT_EQ(data.hash,
"4F0E9C6A1A9A90F35B884D0F0E7343459C21060EEFEC6C0F2FA9DC1118DBE5BE");
EXPECT_TRUE(IsDocMimeType(data.mime_type))
<< data.mime_type << " is not an expected mimetype";
}
TEST_F(FileAnalysisRequestTest, NormalFilesDataControls) {
base::test::TaskEnvironment task_environment;
BinaryUploadService::Result result;
BinaryUploadService::Request::Data data;
file_access::MockScopedFileAccessDelegate scoped_files_access_delegate;
EXPECT_CALL(scoped_files_access_delegate, RequestFilesAccessForSystem)
.WillOnce(base::test::RunOnceCallback<1>(
file_access::ScopedFileAccess::Allowed()))
.WillOnce(base::test::RunOnceCallback<1>(
file_access::ScopedFileAccess::Allowed()));
std::string normal_contents = "Normal file contents";
GetResultsForFileContents(normal_contents, &result, &data);
EXPECT_EQ(result, BinaryUploadService::Result::SUCCESS);
EXPECT_EQ(data.size, normal_contents.size());
EXPECT_TRUE(data.contents.empty());
// printf "Normal file contents" | sha256sum | tr '[:lower:]' '[:upper:]'
EXPECT_EQ(data.hash,
"29644C10BD036866FCFD2BDACFF340DB5DE47A90002D6AB0C42DE6A22C26158B");
EXPECT_TRUE(IsDocMimeType(data.mime_type))
<< data.mime_type << " is not an expected mimetype";
std::string long_contents =
std::string(BinaryUploadService::kMaxUploadSizeBytes, 'a');
GetResultsForFileContents(long_contents, &result, &data);
EXPECT_EQ(result, BinaryUploadService::Result::SUCCESS);
EXPECT_EQ(data.size, long_contents.size());
EXPECT_TRUE(data.contents.empty());
// python3 -c "print('a' * (50 * 1024 * 1024), end='')" | sha256sum | tr
// '[:lower:]' '[:upper:]'
EXPECT_EQ(data.hash,
"4F0E9C6A1A9A90F35B884D0F0E7343459C21060EEFEC6C0F2FA9DC1118DBE5BE");
EXPECT_TRUE(IsDocMimeType(data.mime_type))
<< data.mime_type << " is not an expected mimetype";
}
TEST_F(FileAnalysisRequestTest, LargeFiles) {
base::test::TaskEnvironment task_environment;
BinaryUploadService::Result result;
BinaryUploadService::Request::Data data;
std::string large_file_contents(BinaryUploadService::kMaxUploadSizeBytes + 1,
'a');
GetResultsForFileContents(large_file_contents, &result, &data);
EXPECT_EQ(result, BinaryUploadService::Result::FILE_TOO_LARGE);
EXPECT_EQ(data.size, large_file_contents.size());
EXPECT_TRUE(data.contents.empty());
// python3 -c "print('a' * (50 * 1024 * 1024 + 1), end='')" | sha256sum | tr
// '[:lower:]' '[:upper:]'
EXPECT_EQ(data.hash,
"9EB56DB30C49E131459FE735BA6B9D38327376224EC8D5A1233F43A5B4A25942");
EXPECT_TRUE(IsDocMimeType(data.mime_type))
<< data.mime_type << " is not an expected mimetype";
std::string very_large_file_contents(
2 * BinaryUploadService::kMaxUploadSizeBytes, 'a');
GetResultsForFileContents(very_large_file_contents, &result, &data);
EXPECT_EQ(result, BinaryUploadService::Result::FILE_TOO_LARGE);
EXPECT_EQ(data.size, very_large_file_contents.size());
EXPECT_TRUE(data.contents.empty());
// python3 -c "print('a' * (100 * 1024 * 1024), end='')" | sha256sum | tr
// '[:lower:]' '[:upper:]'
EXPECT_EQ(data.hash,
"CEE41E98D0A6AD65CC0EC77A2BA50BF26D64DC9007F7F1C7D7DF68B8B71291A6");
EXPECT_TRUE(IsDocMimeType(data.mime_type))
<< data.mime_type << " is not an expected mimetype";
}
TEST_F(FileAnalysisRequestTest, NewFileLimitSet) {
base::test::ScopedFeatureList scoped_feature_list;
scoped_feature_list.InitAndEnableFeatureWithParameters(
enterprise_connectors::kEnableNewUploadSizeLimit,
{{"max_file_size_mb", "100"}});
base::test::TaskEnvironment task_environment;
BinaryUploadService::Result result;
BinaryUploadService::Request::Data data;
// Lower than the new limit of 100MB.
std::string small_file_contents(100 * 1024 * 1024 - 1, 'a');
GetResultsForFileContents(small_file_contents, &result, &data);
EXPECT_EQ(result, BinaryUploadService::Result::SUCCESS);
EXPECT_EQ(data.size, small_file_contents.size());
EXPECT_TRUE(data.contents.empty());
// Above the new limit of 100MB.
std::string large_file_contents(100 * 1024 * 1024 + 1, 'a');
GetResultsForFileContents(large_file_contents, &result, &data);
EXPECT_EQ(result, BinaryUploadService::Result::FILE_TOO_LARGE);
EXPECT_EQ(data.size, large_file_contents.size());
EXPECT_TRUE(data.contents.empty());
// python3 -c "print('a' * (100 * 1024 * 1024 + 1), end='')" | sha256sum | tr
// '[:lower:]' '[:upper:]'
EXPECT_EQ(data.hash,
"700A2A19FF7AE59E77BAE4E504371B6E5FF0F1698F02CF50F99AF3F20B02A6FB");
EXPECT_TRUE(IsDocMimeType(data.mime_type))
<< data.mime_type << " is not an expected mimetype";
}
TEST_F(FileAnalysisRequestTest, PopulatesDigest) {
base::test::TaskEnvironment task_environment;
std::string file_contents = "Normal file contents";
base::ScopedTempDir temp_dir;
ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
base::FilePath file_path = temp_dir.GetPath().AppendASCII("foo.doc");
// Create the file.
base::File file(file_path, base::File::FLAG_CREATE | base::File::FLAG_WRITE);
file.WriteAtCurrentPos(base::as_byte_span(file_contents));
auto request = MakeRequest(file_path, file_path.BaseName(),
/*delay_opening_file*/ false);
base::RunLoop run_loop;
request->GetRequestData(base::IgnoreArgs<BinaryUploadService::Result,
BinaryUploadService::Request::Data>(
run_loop.QuitClosure()));
run_loop.Run();
// printf "Normal file contents" | sha256sum | tr '[:lower:]' '[:upper:]'
EXPECT_EQ(request->digest(),
"29644C10BD036866FCFD2BDACFF340DB5DE47A90002D6AB0C42DE6A22C26158B");
}
TEST_F(FileAnalysisRequestTest, PopulatesFilename) {
base::test::TaskEnvironment task_environment;
std::string file_contents = "contents";
base::ScopedTempDir temp_dir;
ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
base::FilePath file_path = temp_dir.GetPath().AppendASCII("foo.doc");
// Create the file.
base::File file(file_path, base::File::FLAG_CREATE | base::File::FLAG_WRITE);
file.WriteAtCurrentPos(base::as_byte_span(file_contents));
auto request = MakeRequest(file_path, file_path.BaseName(),
/*delay_opening_file*/ false);
base::RunLoop run_loop;
request->GetRequestData(base::IgnoreArgs<BinaryUploadService::Result,
BinaryUploadService::Request::Data>(
run_loop.QuitClosure()));
run_loop.Run();
EXPECT_EQ(request->filename(), file_path.AsUTF8Unsafe());
}
TEST_F(FileAnalysisRequestTest, CachesResults) {
base::test::TaskEnvironment task_environment;
base::ScopedTempDir temp_dir;
ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
std::string normal_contents = "Normal file contents";
base::FilePath file_path = temp_dir.GetPath().AppendASCII("normal.doc");
base::WriteFile(file_path, normal_contents);
auto request = MakeRequest(file_path, file_path.BaseName(),
/*delay_opening_file*/ false);
base::test::TestFuture<BinaryUploadService::Result,
BinaryUploadService::Request::Data>
future;
request->GetRequestData(future.GetCallback());
auto [async_result, async_data] = future.Take();
request->GetRequestData(future.GetCallback());
auto [sync_result, sync_data] = future.Take();
EXPECT_EQ(sync_result, async_result);
EXPECT_EQ(sync_data.contents, async_data.contents);
EXPECT_EQ(sync_data.size, async_data.size);
EXPECT_EQ(sync_data.hash, async_data.hash);
EXPECT_EQ(sync_data.mime_type, async_data.mime_type);
}
TEST_F(FileAnalysisRequestTest, CachesResultsWithKnownMimetype) {
base::test::TaskEnvironment task_environment;
base::ScopedTempDir temp_dir;
ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
std::string normal_contents = "Normal file contents";
base::FilePath file_path = temp_dir.GetPath().AppendASCII("normal.doc");
base::WriteFile(file_path, normal_contents);
auto request = MakeRequest(file_path, file_path.BaseName(),
/*delay_opening_file*/ false, "fake/mimetype");
base::test::TestFuture<BinaryUploadService::Result,
BinaryUploadService::Request::Data>
future;
request->GetRequestData(future.GetCallback());
auto [result, data] = future.Take();
EXPECT_EQ(result, BinaryUploadService::Result::SUCCESS);
EXPECT_EQ(data.size, normal_contents.size());
EXPECT_TRUE(data.contents.empty());
// printf "Normal file contents" | sha256sum | tr '[:lower:]' '[:upper:]'
EXPECT_EQ(data.hash,
"29644C10BD036866FCFD2BDACFF340DB5DE47A90002D6AB0C42DE6A22C26158B");
EXPECT_EQ(request->digest(), data.hash);
EXPECT_EQ(request->content_type(), "fake/mimetype");
}
TEST_F(FileAnalysisRequestTest, DelayedFileOpening) {
content::BrowserTaskEnvironment browser_task_environment;
// base::test::TaskEnvironment task_environment;
std::string file_contents = "Normal file contents";
base::ScopedTempDir temp_dir;
ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
base::FilePath file_path = temp_dir.GetPath().AppendASCII("foo.doc");
// Create the file.
base::File file(file_path, base::File::FLAG_CREATE | base::File::FLAG_WRITE);
file.WriteAtCurrentPos(base::as_byte_span(file_contents));
auto request =
MakeRequest(file_path, file_path.BaseName(), /*delay_opening_file*/ true);
base::RunLoop run_loop;
request->GetRequestData(base::BindLambdaForTesting(
[&run_loop, &file_contents](BinaryUploadService::Result result,
BinaryUploadService::Request::Data data) {
run_loop.Quit();
EXPECT_EQ(result, BinaryUploadService::Result::SUCCESS);
EXPECT_EQ(data.size, file_contents.size());
EXPECT_TRUE(data.contents.empty());
// printf "Normal file contents" | sha256sum |\
// tr '[:lower:]' '[:upper:]'
EXPECT_EQ(
data.hash,
"29644C10BD036866FCFD2BDACFF340DB5DE47A90002D6AB0C42DE6A22C26158B");
EXPECT_TRUE(IsDocMimeType(data.mime_type))
<< data.mime_type << " is not an expected mimetype";
}));
base::RunLoop().RunUntilIdle();
EXPECT_FALSE(run_loop.AnyQuitCalled());
request->OpenFile();
run_loop.Run();
EXPECT_TRUE(run_loop.AnyQuitCalled());
}
TEST_F(FileAnalysisRequestTest, SuccessWithCorrectPassword) {
content::BrowserTaskEnvironment browser_task_environment;
content::InProcessUtilityThreadHelper in_process_utility_thread_helper;
base::FilePath test_zip;
EXPECT_TRUE(base::PathService::Get(chrome::DIR_TEST_DATA, &test_zip));
test_zip =
test_zip.AppendASCII("safe_browsing/download_protection/encrypted.zip");
auto request =
MakeRequest(test_zip, test_zip.BaseName(), /*delay_opening_file*/ false);
request->set_password("12345");
base::test::TestFuture<BinaryUploadService::Result,
BinaryUploadService::Request::Data>
future;
request->GetRequestData(future.GetCallback());
auto [result, data] = future.Take();
EXPECT_EQ(result, BinaryUploadService::Result::SUCCESS);
}
TEST_F(FileAnalysisRequestTest, FileEncryptedWithIncorrectPassword) {
content::BrowserTaskEnvironment browser_task_environment;
content::InProcessUtilityThreadHelper in_process_utility_thread_helper;
base::FilePath test_zip;
EXPECT_TRUE(base::PathService::Get(chrome::DIR_TEST_DATA, &test_zip));
test_zip =
test_zip.AppendASCII("safe_browsing/download_protection/encrypted.zip");
auto request =
MakeRequest(test_zip, test_zip.BaseName(), /*delay_opening_file*/ false);
request->set_password("67890");
base::test::TestFuture<BinaryUploadService::Result,
BinaryUploadService::Request::Data>
future;
request->GetRequestData(future.GetCallback());
auto [result, data] = future.Take();
EXPECT_EQ(result, BinaryUploadService::Result::FILE_ENCRYPTED);
}
// Class used to validate that an archive file is correctly detected and checked
// for encryption, even without a .zip/.rar extension.
class FileAnalysisRequestZipTest
: public FileAnalysisRequestTest,
public testing::WithParamInterface<const char*> {
public:
const char* file_name() const { return GetParam(); }
};
INSTANTIATE_TEST_SUITE_P(,
FileAnalysisRequestZipTest,
testing::Values("encrypted.zip",
"encrypted_zip_no_extension"));
TEST_P(FileAnalysisRequestZipTest, Encrypted) {
content::BrowserTaskEnvironment browser_task_environment;
content::InProcessUtilityThreadHelper in_process_utility_thread_helper;
base::ScopedTempDir temp_dir;
ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
base::FilePath test_zip;
EXPECT_TRUE(base::PathService::Get(chrome::DIR_TEST_DATA, &test_zip));
test_zip = test_zip.AppendASCII("safe_browsing")
.AppendASCII("download_protection")
.AppendASCII(file_name());
auto request =
MakeRequest(test_zip, test_zip.BaseName(), /*delay_opening_file*/ false);
base::test::TestFuture<BinaryUploadService::Result,
BinaryUploadService::Request::Data>
future;
request->GetRequestData(future.GetCallback());
auto [result, data] = future.Take();
// encrypted_zip_no_extension is a copy of encrypted.zip, so the same
// assertions hold and the same commands can be used to get its size/hash.
EXPECT_EQ(result, BinaryUploadService::Result::FILE_ENCRYPTED);
// du chrome/test/data/safe_browsing/download_protection/<file> -b
EXPECT_EQ(data.size, 20015u);
// sha256sum < chrome/test/data/safe_browsing/download_protection/<file> \
// | tr '[:lower:]' '[:upper:]'
EXPECT_EQ(data.hash,
"701FCEA8B2112FFAB257A8A8DFD3382ABCF047689AB028D42903E3B3AA488D9A");
EXPECT_EQ(request->digest(), data.hash);
EXPECT_TRUE(data.contents.empty());
EXPECT_EQ(test_zip, data.path);
EXPECT_TRUE(IsZipMimeType(data.mime_type));
}
TEST_F(FileAnalysisRequestTest, ObfuscatedFile) {
base::test::ScopedFeatureList scoped_feature_list;
scoped_feature_list.InitAndEnableFeature(
enterprise_obfuscation::kEnterpriseFileObfuscation);
base::test::TaskEnvironment task_environment;
base::ScopedTempDir temp_dir;
ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
// Create original file contents.
std::vector<uint8_t> original_contents(5000, 'a');
base::FilePath file_path = temp_dir.GetPath().AppendASCII("obfuscated");
// Obfuscate the file contents and write to file.
enterprise_obfuscation::DownloadObfuscator obfuscator;
auto obfuscation_result =
obfuscator.ObfuscateChunk(base::span(original_contents), true);
ASSERT_TRUE(obfuscation_result.has_value());
ASSERT_TRUE(base::WriteFile(file_path, obfuscation_result.value()));
auto obfuscated_request = MakeRequest(file_path, file_path.BaseName(),
/*delay_opening_file=*/false,
/*mime_type=*/"",
/*is_obfuscated=*/true);
base::test::TestFuture<BinaryUploadService::Result,
BinaryUploadService::Request::Data>
future;
obfuscated_request->GetRequestData(future.GetCallback());
auto [result, data] = future.Take();
EXPECT_EQ(result, BinaryUploadService::Result::SUCCESS);
// Check if size has been updated to use the calculated unobfuscated content
// size.
EXPECT_EQ(data.size, original_contents.size());
}
} // namespace safe_browsing
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