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// Copyright 2023 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 "chrome/browser/ash/bruschetta/bruschetta_download.h"
#include "base/files/scoped_temp_dir.h"
#include "base/memory/ptr_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "chrome/browser/ash/bruschetta/bruschetta_network_context.h"
#include "chrome/browser/extensions/cws_info_service.h"
#include "chrome/browser/profiles/profile.h"
#include "components/prefs/pref_service.h"
#include "content/public/browser/storage_partition.h"
#include "crypto/secure_hash.h"
#include "crypto/sha2.h"
#include "net/base/net_errors.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/cpp/simple_url_loader.h"
namespace bruschetta {
const net::NetworkTrafficAnnotationTag kBruschettaTrafficAnnotation =
net::DefineNetworkTrafficAnnotation("bruschetta_installer_download",
R"(
semantics {
sender: "Bruschetta VM Installer",
description: "Request sent to download firmware and VM image for "
"a Bruschetta VM, which allows the user to run the VM."
trigger: "User installing a Bruschetta VM"
internal {
contacts {
email: "clumptini+oncall@google.com"
}
}
user_data: {
type: ACCESS_TOKEN
}
data: "Request to download Bruschetta firmware and VM image. "
"Sends cookies associated with the source to authenticate the user."
destination: WEBSITE
last_reviewed: "2023-01-09"
}
policy {
cookies_allowed: YES
cookies_store: "user"
chrome_policy {
BruschettaVMConfiguration {
BruschettaVMConfiguration: "{}"
}
}
}
)");
namespace {
std::unique_ptr<base::ScopedTempDir> MakeTempDir() {
auto dir = std::make_unique<base::ScopedTempDir>();
CHECK(dir->CreateUniqueTempDir());
return dir;
}
// Calculates the sha256 hash of the file at `path` incrementally i.e. without
// loading the entire thing into memory at once. Blocking.
std::string Sha256File(const base::FilePath& path) {
base::File file(path, base::File::FLAG_OPEN | base::File::FLAG_READ);
if (!file.IsValid()) {
return "";
}
std::unique_ptr<crypto::SecureHash> ctx(
crypto::SecureHash::Create(crypto::SecureHash::SHA256));
std::array<uint8_t, 4096> buffer;
while (true) {
std::optional<size_t> read = file.ReadAtCurrentPos(buffer);
// Treat EOF the same as any other error, stop reading and return the hash
// of what we read. If there was a disk error or something we'll end up with
// an invalid hash, same as if the file were truncated.
if (read.value_or(0) == 0) {
break;
}
ctx->Update(base::span(buffer).first(*read));
}
std::array<uint8_t, crypto::kSHA256Length> digest_bytes;
ctx->Finish(digest_bytes);
return base::HexEncode(digest_bytes);
}
} // namespace
std::string Sha256FileForTesting(const base::FilePath& path) {
return Sha256File(path);
}
SimpleURLLoaderDownload::SimpleURLLoaderDownload(PrefService& local_state)
: local_state_(local_state) {}
SimpleURLLoaderDownload::~SimpleURLLoaderDownload() {
auto seq = base::ThreadPool::CreateSequencedTaskRunner({base::MayBlock()});
seq->DeleteSoon(FROM_HERE, std::move(scoped_temp_dir_));
if (post_deletion_closure_for_testing_) {
seq->PostTask(FROM_HERE, std::move(post_deletion_closure_for_testing_));
}
}
void SimpleURLLoaderDownload::StartDownload(
Profile* profile,
GURL url,
base::OnceCallback<void(base::FilePath path, std::string sha256)>
callback) {
DCHECK(url_.is_empty()) << " each instance is single use";
url_ = std::move(url);
callback_ = std::move(callback);
// We're owned (through a few levels of owning class) by the installer view
// which won't outlive the profile, so it's safe to pass around the raw
// pointer.
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, {base::MayBlock()}, base::BindOnce(&MakeTempDir),
base::BindOnce(&SimpleURLLoaderDownload::Download,
weak_ptr_factory_.GetWeakPtr(), profile));
}
void SimpleURLLoaderDownload::Download(
Profile* profile,
std::unique_ptr<base::ScopedTempDir> dir) {
scoped_temp_dir_ = std::move(dir);
auto path = scoped_temp_dir_->GetPath().Append("download");
auto req = std::make_unique<network::ResourceRequest>();
req->url = url_;
req->site_for_cookies = net::SiteForCookies::FromUrl(url_);
loader_ = network::SimpleURLLoader::Create(std::move(req),
kBruschettaTrafficAnnotation);
network_context_ =
std::make_unique<BruschettaNetworkContext>(profile, local_state_.get());
loader_->DownloadToFile(network_context_->GetURLLoaderFactory(),
base::BindOnce(&SimpleURLLoaderDownload::Finished,
weak_ptr_factory_.GetWeakPtr()),
std::move(path));
}
void SimpleURLLoaderDownload::Finished(base::FilePath path) {
if (path.empty()) {
LOG(ERROR) << "Download failed: " << net::ErrorToString(loader_->NetError())
<< " (" << loader_->NetError() << ")";
std::move(callback_).Run(path, "");
return;
}
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, {base::MayBlock()}, base::BindOnce(&Sha256File, path),
base::BindOnce(std::move(callback_), path));
}
} // namespace bruschetta
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