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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "components/download/public/common/base_file.h"
#include <memory>
#include <utility>
#include "base/containers/heap_array.h"
#include "base/files/file.h"
#include "base/files/file_util.h"
#include "base/format_macros.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/metrics/histogram_functions.h"
#include "base/notreached.h"
#include "base/numerics/safe_conversions.h"
#include "base/pickle.h"
#include "base/strings/stringprintf.h"
#include "base/threading/thread_restrictions.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "components/download/public/common/download_interrupt_reasons_utils.h"
#include "components/download/public/common/download_item.h"
#include "components/download/public/common/download_stats.h"
#include "components/services/quarantine/quarantine.h"
#include "crypto/secure_hash.h"
#if BUILDFLAG(IS_ANDROID)
#include "base/android/content_uri_utils.h"
#include "components/download/internal/common/android/download_collection_bridge.h"
#endif // BUILDFLAG(IS_ANDROID)
#define CONDITIONAL_TRACE(trace) \
do { \
if (download_id_ != DownloadItem::kInvalidId) \
TRACE_EVENT_##trace; \
} while (0)
namespace download {
namespace {
class FileErrorData : public base::trace_event::ConvertableToTraceFormat {
public:
FileErrorData(const char* operation,
int os_error,
DownloadInterruptReason interrupt_reason)
: operation_(operation),
os_error_(os_error),
interrupt_reason_(interrupt_reason) {}
FileErrorData(const FileErrorData&) = delete;
FileErrorData& operator=(const FileErrorData&) = delete;
~FileErrorData() override = default;
void AppendAsTraceFormat(std::string* out) const override {
out->append("{");
out->append(
base::StringPrintf("\"operation\":\"%s\",", operation_.c_str()));
out->append(base::StringPrintf("\"os_error\":\"%d\",", os_error_));
out->append(base::StringPrintf(
"\"interrupt_reason\":\"%s\",",
DownloadInterruptReasonToString(interrupt_reason_).c_str()));
out->append("}");
}
private:
std::string operation_;
int os_error_;
DownloadInterruptReason interrupt_reason_;
};
void InitializeFile(base::File* file, const base::FilePath& file_path) {
#if BUILDFLAG(IS_ANDROID)
if (file_path.IsContentUri()) {
*file = DownloadCollectionBridge::OpenIntermediateUri(file_path);
return;
}
#endif // BUILDFLAG(IS_ANDROID)
// Use exclusive write to prevent another process from writing the file.
file->Initialize(
file_path,
base::File::FLAG_OPEN_ALWAYS | base::File::FLAG_WRITE |
base::File::FLAG_READ |
// Don't allow other processes to write to the file while
// Chrome is writing (Windows-specific).
base::File::FLAG_WIN_EXCLUSIVE_WRITE |
// Allow the file to be renamed or replaced (Windows-specific).
base::File::FLAG_WIN_SHARE_DELETE);
}
void DeleteFileWrapper(const base::FilePath& file_path) {
#if BUILDFLAG(IS_ANDROID)
if (file_path.IsContentUri()) {
DownloadCollectionBridge::DeleteIntermediateUri(file_path);
return;
}
#endif // BUILDFLAG(IS_ANDROID)
base::DeleteFile(file_path);
}
} // namespace
BaseFile::BaseFile(uint32_t download_id) : download_id_(download_id) {
DETACH_FROM_SEQUENCE(sequence_checker_);
}
BaseFile::~BaseFile() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (detached_)
Close();
else
Cancel(); // Will delete the file.
}
DownloadInterruptReason BaseFile::Initialize(
const base::FilePath& full_path,
const base::FilePath& default_directory,
base::File file,
int64_t bytes_so_far,
const std::string& hash_so_far,
std::unique_ptr<crypto::SecureHash> hash_state,
bool is_sparse_file,
int64_t* const bytes_wasted) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(!detached_);
if (full_path.empty()) {
base::FilePath temp_file;
if ((default_directory.empty() ||
!base::CreateTemporaryFileInDir(default_directory, &temp_file)) &&
!base::CreateTemporaryFile(&temp_file)) {
return LogInterruptReason("Unable to create", 0,
DOWNLOAD_INTERRUPT_REASON_FILE_FAILED);
}
full_path_ = temp_file;
} else {
full_path_ = full_path;
}
bytes_so_far_ = bytes_so_far;
secure_hash_ = std::move(hash_state);
is_sparse_file_ = is_sparse_file;
// Sparse file doesn't validate hash.
if (is_sparse_file_)
secure_hash_.reset();
file_ = std::move(file);
return Open(hash_so_far, bytes_wasted);
}
DownloadInterruptReason BaseFile::AppendDataToFile(const char* data,
size_t data_len) {
DCHECK(!is_sparse_file_);
return WriteDataToFile(bytes_so_far_, data, data_len);
}
DownloadInterruptReason BaseFile::WriteDataToFile(int64_t offset,
const char* data,
size_t data_len) {
// NOTE(benwells): The above DCHECK won't be present in release builds,
// so we log any occurences to see how common this error is in the wild.
if (detached_)
RecordDownloadCount(APPEND_TO_DETACHED_FILE_COUNT);
if (!file_.IsValid()) {
return LogInterruptReason("No file stream on append", 0,
DOWNLOAD_INTERRUPT_REASON_FILE_FAILED);
}
// TODO(phajdan.jr): get rid of this check.
if (data_len == 0)
return DOWNLOAD_INTERRUPT_REASON_NONE;
// Use nestable async event instead of sync event so that all the writes
// belong to the same download will be grouped together.
CONDITIONAL_TRACE(
NESTABLE_ASYNC_BEGIN0("download", "DownloadFileWrite", download_id_));
if (bytes_so_far_ != offset) {
// A hole is created in the file.
is_sparse_file_ = true;
secure_hash_.reset();
}
// Writes to the file.
int64_t len = base::saturated_cast<int64_t>(data_len);
const char* current_data = data;
int64_t current_offset = offset;
while (len > 0) {
// |write_result| may be less than |len|, and return an error on the next
// write call when the disk is unavaliable.
int write_result = file_.Write(current_offset, current_data, len);
DCHECK_NE(0, write_result);
// Report errors on file writes.
if (write_result < 0)
return LogSystemError("Write", logging::GetLastSystemErrorCode());
// Update status.
DCHECK_LE(write_result, len);
len -= write_result;
current_data += write_result;
current_offset += write_result;
bytes_so_far_ += write_result;
}
CONDITIONAL_TRACE(NESTABLE_ASYNC_END1("download", "DownloadFileWrite",
download_id_, "bytes", data_len));
if (secure_hash_)
secure_hash_->Update(data, data_len);
return DOWNLOAD_INTERRUPT_REASON_NONE;
}
bool BaseFile::ValidateDataInFile(int64_t offset,
const char* data,
size_t data_len) {
if (!file_.IsValid())
return false;
// Only validate the first chunk of the file. So |offset| cannot be
// larger than bytes received.
if (offset > bytes_so_far_)
return false;
if (data_len <= 0)
return true;
auto buffer = base::HeapArray<char>::Uninit(data_len);
int bytes_read = file_.Read(offset, buffer.data(), buffer.size());
if (bytes_read < 0 || static_cast<size_t>(bytes_read) < data_len)
return false;
return memcmp(data, buffer.data(), buffer.size()) == 0;
}
DownloadInterruptReason BaseFile::Rename(const base::FilePath& new_path) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DownloadInterruptReason rename_result = DOWNLOAD_INTERRUPT_REASON_NONE;
// If the new path is same as the old one, there is no need to perform the
// following renaming logic.
if (new_path == full_path_)
return DOWNLOAD_INTERRUPT_REASON_NONE;
// Save the information whether the download is in progress because
// it will be overwritten by closing the file.
bool was_in_progress = in_progress();
Close();
CONDITIONAL_TRACE(BEGIN2("download", "DownloadFileRename", "old_filename",
full_path_.AsUTF8Unsafe(), "new_filename",
new_path.AsUTF8Unsafe()));
bool need_to_move_file = true;
#if BUILDFLAG(IS_ANDROID)
if (new_path.IsContentUri()) {
rename_result = DownloadCollectionBridge::MoveFileToIntermediateUri(
full_path_, new_path);
need_to_move_file = false;
}
#endif
if (need_to_move_file) {
base::CreateDirectory(new_path.DirName());
// A simple rename wouldn't work here since we want the file to have
// permissions / security descriptors that makes sense in the new directory.
rename_result = MoveFileAndAdjustPermissions(new_path);
}
CONDITIONAL_TRACE(END0("download", "DownloadFileRename"));
if (rename_result == DOWNLOAD_INTERRUPT_REASON_NONE)
full_path_ = new_path;
// Re-open the file if we were still using it regardless of the interrupt
// reason.
DownloadInterruptReason open_result = DOWNLOAD_INTERRUPT_REASON_NONE;
if (was_in_progress) {
int64_t bytes_wasted; // Do not need to use bytes_wasted.
open_result = Open(std::string(), &bytes_wasted);
}
return rename_result == DOWNLOAD_INTERRUPT_REASON_NONE ? open_result
: rename_result;
}
void BaseFile::Detach() {
weak_factory_.InvalidateWeakPtrs();
detached_ = true;
CONDITIONAL_TRACE(
INSTANT0("download", "DownloadFileDetached", TRACE_EVENT_SCOPE_THREAD));
}
void BaseFile::Cancel() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(!detached_);
CONDITIONAL_TRACE(
INSTANT0("download", "DownloadCancelled", TRACE_EVENT_SCOPE_THREAD));
Close();
if (!full_path_.empty()) {
CONDITIONAL_TRACE(
INSTANT0("download", "DownloadFileDeleted", TRACE_EVENT_SCOPE_THREAD));
DeleteFileWrapper(full_path_);
}
Detach();
}
std::unique_ptr<crypto::SecureHash> BaseFile::Finish() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// TODO(qinmin): verify that all the holes have been filled.
if (is_sparse_file_)
CalculatePartialHash(std::string());
Close();
return std::move(secure_hash_);
}
std::string BaseFile::DebugString() const {
return base::StringPrintf(
"{ "
" full_path_ = \"%" PRFilePath
"\""
" bytes_so_far_ = %" PRId64 " detached_ = %c }",
full_path_.value().c_str(), bytes_so_far_, detached_ ? 'T' : 'F');
}
DownloadInterruptReason BaseFile::CalculatePartialHash(
const std::string& hash_to_expect) {
secure_hash_ = crypto::SecureHash::Create(crypto::SecureHash::SHA256);
if (bytes_so_far_ == 0)
return DOWNLOAD_INTERRUPT_REASON_NONE;
if (file_.Seek(base::File::FROM_BEGIN, 0) != 0)
return LogSystemError("Seek partial file",
logging::GetLastSystemErrorCode());
const size_t kMinBufferSize = secure_hash_->GetHashLength();
const size_t kMaxBufferSize = 1024 * 512;
static_assert(kMaxBufferSize <= std::numeric_limits<int>::max(),
"kMaxBufferSize must fit on an int");
// The size of the buffer is:
// - at least kMinBufferSize so that we can use it to hold the hash as well.
// - at most kMaxBufferSize so that there's a reasonable bound.
// - not larger than |bytes_so_far_| unless bytes_so_far_ is less than the
// hash size.
std::vector<char> buffer(std::max<int64_t>(
kMinBufferSize, std::min<int64_t>(kMaxBufferSize, bytes_so_far_)));
int64_t current_position = 0;
while (current_position < bytes_so_far_) {
// While std::min needs to work with int64_t, the result is always at most
// kMaxBufferSize, which fits on an int.
int bytes_to_read =
std::min<int64_t>(buffer.size(), bytes_so_far_ - current_position);
int length = file_.ReadAtCurrentPos(&buffer.front(), bytes_to_read);
if (length == -1) {
return LogInterruptReason("Reading partial file",
logging::GetLastSystemErrorCode(),
DOWNLOAD_INTERRUPT_REASON_FILE_TOO_SHORT);
}
if (length == 0)
break;
secure_hash_->Update(&buffer.front(), length);
current_position += length;
}
if (current_position != bytes_so_far_) {
return LogInterruptReason("Verifying prefix hash", 0,
DOWNLOAD_INTERRUPT_REASON_FILE_TOO_SHORT);
}
if (!hash_to_expect.empty()) {
DCHECK_EQ(secure_hash_->GetHashLength(), hash_to_expect.size());
DCHECK(buffer.size() >= secure_hash_->GetHashLength());
std::unique_ptr<crypto::SecureHash> partial_hash(secure_hash_->Clone());
partial_hash->Finish(&buffer.front(), buffer.size());
if (memcmp(&buffer.front(), hash_to_expect.c_str(),
partial_hash->GetHashLength())) {
return LogInterruptReason("Verifying prefix hash", 0,
DOWNLOAD_INTERRUPT_REASON_FILE_HASH_MISMATCH);
}
}
return DOWNLOAD_INTERRUPT_REASON_NONE;
}
DownloadInterruptReason BaseFile::Open(const std::string& hash_so_far,
int64_t* const bytes_wasted) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(!detached_);
DCHECK(!full_path_.empty());
// Create a new file if it is not provided.
if (!file_.IsValid()) {
InitializeFile(&file_, full_path_);
if (!file_.IsValid()) {
return LogNetError("Open/Initialize File",
net::FileErrorToNetError(file_.error_details()));
}
}
CONDITIONAL_TRACE(NESTABLE_ASYNC_BEGIN2(
"download", "DownloadFileOpen", download_id_, "file_name",
full_path_.AsUTF8Unsafe(), "bytes_so_far", bytes_so_far_));
// For sparse file, skip hash validation.
if (is_sparse_file_) {
if (file_.GetLength() < bytes_so_far_) {
*bytes_wasted = bytes_so_far_;
ClearFile();
return LogInterruptReason("File has fewer written bytes than expected", 0,
DOWNLOAD_INTERRUPT_REASON_FILE_TOO_SHORT);
}
return DOWNLOAD_INTERRUPT_REASON_NONE;
}
if (!secure_hash_) {
DownloadInterruptReason reason = CalculatePartialHash(hash_so_far);
if (reason != DOWNLOAD_INTERRUPT_REASON_NONE) {
*bytes_wasted = file_.GetLength();
ClearFile();
return reason;
}
}
int64_t file_size = file_.Seek(base::File::FROM_END, 0);
if (file_size < 0) {
logging::SystemErrorCode error = logging::GetLastSystemErrorCode();
ClearFile();
return LogSystemError("Seeking to end", error);
} else if (file_size > bytes_so_far_) {
// The file is larger than we expected.
// This is OK, as long as we don't use the extra.
// Truncate the file.
*bytes_wasted = file_size - bytes_so_far_;
if (!file_.SetLength(bytes_so_far_) ||
file_.Seek(base::File::FROM_BEGIN, bytes_so_far_) != bytes_so_far_) {
logging::SystemErrorCode error = logging::GetLastSystemErrorCode();
*bytes_wasted = file_size;
ClearFile();
return LogSystemError("Truncating to last known offset", error);
}
} else if (file_size < bytes_so_far_) {
// The file is shorter than we expected. Our hashes won't be valid.
*bytes_wasted = bytes_so_far_;
ClearFile();
return LogInterruptReason("Unable to seek to last written point", 0,
DOWNLOAD_INTERRUPT_REASON_FILE_TOO_SHORT);
}
return DOWNLOAD_INTERRUPT_REASON_NONE;
}
void BaseFile::Close() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (file_.IsValid()) {
// Currently we don't really care about the return value, since if it fails
// theres not much we can do. But we might in the future.
file_.Flush();
ClearFile();
}
}
void BaseFile::ClearFile() {
// This should only be called when we have a stream.
DCHECK(file_.IsValid());
file_.Close();
CONDITIONAL_TRACE(
NESTABLE_ASYNC_END0("download", "DownloadFileOpen", download_id_));
}
DownloadInterruptReason BaseFile::LogNetError(const char* operation,
net::Error error) {
CONDITIONAL_TRACE(INSTANT2("download", "DownloadFileError",
TRACE_EVENT_SCOPE_THREAD, "operation", operation,
"net_error", error));
return ConvertNetErrorToInterruptReason(error, DOWNLOAD_INTERRUPT_FROM_DISK);
}
DownloadInterruptReason BaseFile::LogSystemError(
const char* operation,
logging::SystemErrorCode os_error) {
// There's no direct conversion from a system error to an interrupt reason.
base::File::Error file_error = base::File::OSErrorToFileError(os_error);
return LogInterruptReason(operation, os_error,
ConvertFileErrorToInterruptReason(file_error));
}
DownloadInterruptReason BaseFile::LogInterruptReason(
const char* operation,
int os_error,
DownloadInterruptReason reason) {
DVLOG(1) << __func__ << "() operation:" << operation
<< " os_error:" << os_error
<< " reason:" << DownloadInterruptReasonToString(reason);
auto error_data =
std::make_unique<FileErrorData>(operation, os_error, reason);
CONDITIONAL_TRACE(INSTANT1("download", "DownloadFileError",
TRACE_EVENT_SCOPE_THREAD, "file_error",
std::move(error_data)));
return reason;
}
#if BUILDFLAG(IS_ANDROID)
DownloadInterruptReason BaseFile::PublishDownload() {
Close();
base::FilePath new_path =
DownloadCollectionBridge::PublishDownload(full_path_);
if (!new_path.empty()) {
full_path_ = new_path;
return DOWNLOAD_INTERRUPT_REASON_NONE;
}
return DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
}
#endif // BUILDFLAG(IS_ANDROID)
namespace {
DownloadInterruptReason QuarantineFileResultToReason(
quarantine::mojom::QuarantineFileResult result) {
switch (result) {
case quarantine::mojom::QuarantineFileResult::OK:
return DOWNLOAD_INTERRUPT_REASON_NONE;
case quarantine::mojom::QuarantineFileResult::VIRUS_INFECTED:
return DOWNLOAD_INTERRUPT_REASON_FILE_VIRUS_INFECTED;
case quarantine::mojom::QuarantineFileResult::SECURITY_CHECK_FAILED:
return DOWNLOAD_INTERRUPT_REASON_FILE_SECURITY_CHECK_FAILED;
case quarantine::mojom::QuarantineFileResult::BLOCKED_BY_POLICY:
return DOWNLOAD_INTERRUPT_REASON_FILE_BLOCKED;
case quarantine::mojom::QuarantineFileResult::ACCESS_DENIED:
return DOWNLOAD_INTERRUPT_REASON_FILE_ACCESS_DENIED;
case quarantine::mojom::QuarantineFileResult::FILE_MISSING:
// Don't have a good interrupt reason here. This return code means that
// the file at |full_path_| went missing before QuarantineFile got to
// look at it. Not expected to happen, but we've seen instances where a
// file goes missing immediately after BaseFile closes the handle.
//
// Intentionally using a different error message than
// SECURITY_CHECK_FAILED in order to distinguish the two.
return DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
case quarantine::mojom::QuarantineFileResult::ANNOTATION_FAILED:
// This means that the mark-of-the-web couldn't be applied. The file is
// already on the file system under its final target name.
//
// Causes of failed annotations typically aren't transient. E.g. the
// target file system may not support extended attributes or alternate
// streams. We are going to allow these downloads to progress on the
// assumption that failures to apply MOTW can't reliably be introduced
// remotely.
return DOWNLOAD_INTERRUPT_REASON_NONE;
}
return DOWNLOAD_INTERRUPT_REASON_FILE_FAILED;
}
} // namespace
// static
GURL BaseFile::GetEffectiveAuthorityURL(const GURL& source_url,
const GURL& referrer_url) {
if (source_url.is_valid()) {
// http{,s} has an authority and are supported.
if (source_url.SchemeIsHTTPOrHTTPS())
return source_url;
// If the download source is file:// ideally we should copy the MOTW from
// the original file, but given that Chrome/Chromium places strict
// restrictions on which schemes can reference file:// URLs, this code is
// going to assume that at this point it's okay to treat this download as
// being from the local system.
if (source_url.SchemeIsFile())
return source_url;
// ftp:// has an authority.
if (source_url.SchemeIs(url::kFtpScheme))
return source_url;
if (source_url.SchemeIs(url::kBlobScheme))
return url::Origin::Create(source_url).GetURL();
}
if (referrer_url.is_valid() && referrer_url.SchemeIsHTTPOrHTTPS())
return referrer_url;
return GURL();
}
void BaseFile::OnFileQuarantined(
quarantine::mojom::QuarantineFileResult result) {
DCHECK(on_annotation_done_callback_);
quarantine_service_.reset();
std::move(on_annotation_done_callback_)
.Run(QuarantineFileResultToReason(result));
}
void BaseFile::OnQuarantineServiceError(const GURL& source_url,
const GURL& referrer_url) {
#if BUILDFLAG(IS_WIN)
OnFileQuarantined(quarantine::SetInternetZoneIdentifierDirectly(
full_path_, source_url, referrer_url));
#else // !BUILDFLAG(IS_WIN)
NOTREACHED() << "In-process quarantine service should not have failed.";
#endif // !BUILDFLAG(IS_WIN)
}
void BaseFile::AnnotateWithSourceInformation(
const std::string& client_guid,
const GURL& source_url,
const GURL& referrer_url,
const std::optional<url::Origin>& request_initiator,
mojo::PendingRemote<quarantine::mojom::Quarantine> remote_quarantine,
OnAnnotationDoneCallback on_annotation_done_callback) {
GURL authority_url = GetEffectiveAuthorityURL(source_url, referrer_url);
if (!remote_quarantine) {
#if BUILDFLAG(IS_WIN)
quarantine::mojom::QuarantineFileResult result =
quarantine::SetInternetZoneIdentifierDirectly(full_path_, authority_url,
referrer_url);
#else
quarantine::mojom::QuarantineFileResult result =
quarantine::mojom::QuarantineFileResult::ANNOTATION_FAILED;
#endif
std::move(on_annotation_done_callback)
.Run(QuarantineFileResultToReason(result));
} else {
quarantine_service_.Bind(std::move(remote_quarantine));
on_annotation_done_callback_ = std::move(on_annotation_done_callback);
quarantine_service_.set_disconnect_handler(base::BindOnce(
&BaseFile::OnQuarantineServiceError, weak_factory_.GetWeakPtr(),
authority_url, referrer_url));
quarantine_service_->QuarantineFile(
full_path_, authority_url, referrer_url, request_initiator, client_guid,
base::BindOnce(&BaseFile::OnFileQuarantined,
weak_factory_.GetWeakPtr()));
}
}
} // namespace download
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