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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/update_client/component_unpacker.h"
#include <stdint.h>
#include <string>
#include <utility>
#include <vector>
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/string_number_conversions.h"
#include "base/task/sequenced_task_runner.h"
#include "components/crx_file/crx_verifier.h"
#include "components/update_client/component_patcher.h"
#include "components/update_client/patcher.h"
#include "components/update_client/unzipper.h"
#include "components/update_client/update_client.h"
#include "components/update_client/update_client_errors.h"
#include "components/update_client/utils.h"
#include "third_party/zlib/google/compression_utils.h"
namespace {
const base::FilePath::CharType kMetadataFolder[] =
FILE_PATH_LITERAL("_metadata");
base::FilePath GetVerifiedContentsPath(const base::FilePath& extension_path) {
return extension_path.Append(kMetadataFolder)
.Append(FILE_PATH_LITERAL("verified_contents.json"));
}
} // namespace
namespace update_client {
ComponentUnpacker::Result::Result() = default;
ComponentUnpacker::ComponentUnpacker(const std::vector<uint8_t>& pk_hash,
const base::FilePath& path,
scoped_refptr<CrxInstaller> installer,
std::unique_ptr<Unzipper> unzipper,
scoped_refptr<Patcher> patcher,
crx_file::VerifierFormat crx_format)
: pk_hash_(pk_hash),
path_(path),
is_delta_(false),
installer_(installer),
unzipper_(std::move(unzipper)),
patcher_tool_(patcher),
crx_format_(crx_format),
error_(UnpackerError::kNone),
extended_error_(0) {}
ComponentUnpacker::~ComponentUnpacker() = default;
void ComponentUnpacker::Unpack(Callback callback) {
callback_ = std::move(callback);
if (!Verify() || !BeginUnzipping())
EndUnpacking();
}
bool ComponentUnpacker::Verify() {
VLOG(1) << "Verifying component: " << path_.value();
if (path_.empty()) {
error_ = UnpackerError::kInvalidParams;
return false;
}
std::vector<std::vector<uint8_t>> required_keys;
if (!pk_hash_.empty())
required_keys.push_back(pk_hash_);
const crx_file::VerifierResult result = crx_file::Verify(
path_, crx_format_, required_keys, std::vector<uint8_t>(), &public_key_,
nullptr, &compressed_verified_contents_);
if (result != crx_file::VerifierResult::OK_FULL &&
result != crx_file::VerifierResult::OK_DELTA) {
error_ = UnpackerError::kInvalidFile;
extended_error_ = static_cast<int>(result);
return false;
}
is_delta_ = result == crx_file::VerifierResult::OK_DELTA;
VLOG(1) << "Verification successful: " << path_.value();
return true;
}
bool ComponentUnpacker::BeginUnzipping() {
// Mind the reference to non-const type, passed as an argument below.
base::FilePath& destination = is_delta_ ? unpack_diff_path_ : unpack_path_;
if (!base::CreateNewTempDirectory(
FILE_PATH_LITERAL("chrome_ComponentUnpacker_BeginUnzipping"),
&destination)) {
VLOG(1) << "Unable to create temporary directory for unpacking.";
error_ = UnpackerError::kUnzipPathError;
return false;
}
VLOG(1) << "Unpacking in: " << destination.value();
unzipper_->Unzip(path_, destination,
base::BindOnce(&ComponentUnpacker::EndUnzipping, this));
return true;
}
void ComponentUnpacker::EndUnzipping(bool result) {
if (!result) {
VLOG(1) << "Unzipping failed.";
error_ = UnpackerError::kUnzipFailed;
EndUnpacking();
return;
}
VLOG(1) << "Unpacked successfully";
base::FilePath verified_contents_path =
GetVerifiedContentsPath(is_delta_ ? unpack_diff_path_ : unpack_path_);
// If the verified contents are already present in the _metadata folder, we
// can ignore the verified contents in the header.
if (compressed_verified_contents_.empty() ||
base::PathExists(verified_contents_path)) {
BeginPatching();
return;
}
UncompressVerifiedContents();
}
void ComponentUnpacker::UncompressVerifiedContents() {
std::string verified_contents;
if (!compression::GzipUncompress(compressed_verified_contents_,
&verified_contents)) {
LOG(ERROR) << "Decompressing verified contents from header failed";
BeginPatching();
return;
}
StoreVerifiedContentsInExtensionDir(verified_contents);
}
void ComponentUnpacker::StoreVerifiedContentsInExtensionDir(
const std::string& verified_contents) {
base::FilePath extension_dir = is_delta_ ? unpack_diff_path_ : unpack_path_;
base::FilePath metadata_path = extension_dir.Append(kMetadataFolder);
if (!base::CreateDirectory(metadata_path)) {
LOG(ERROR) << "Could not create metadata directory " << metadata_path;
BeginPatching();
return;
}
base::FilePath verified_contents_path =
GetVerifiedContentsPath(extension_dir);
// Cannot write the verified contents file.
if (!base::WriteFile(verified_contents_path, verified_contents)) {
LOG(ERROR) << "Could not write verified contents into file "
<< verified_contents_path;
BeginPatching();
return;
}
BeginPatching();
}
void ComponentUnpacker::BeginPatching() {
if (is_delta_) { // Package is a diff package.
// Use a different temp directory for the patch output files.
if (!base::CreateNewTempDirectory(
FILE_PATH_LITERAL("chrome_ComponentUnpacker_BeginPatching"),
&unpack_path_)) {
base::SequencedTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindOnce(&ComponentUnpacker::EndPatching, this,
UnpackerError::kUnzipPathError, 0));
return;
}
patcher_ = base::MakeRefCounted<ComponentPatcher>(
unpack_diff_path_, unpack_path_, installer_, patcher_tool_);
base::SequencedTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE,
base::BindOnce(&ComponentPatcher::Start, patcher_,
base::BindOnce(&ComponentUnpacker::EndPatching, this)));
} else {
base::SequencedTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindOnce(&ComponentUnpacker::EndPatching, this,
UnpackerError::kNone, 0));
}
}
void ComponentUnpacker::EndPatching(UnpackerError error, int extended_error) {
error_ = error;
extended_error_ = extended_error;
patcher_ = nullptr;
EndUnpacking();
}
void ComponentUnpacker::EndUnpacking() {
if (!unpack_diff_path_.empty())
base::DeletePathRecursively(unpack_diff_path_);
if (error_ != UnpackerError::kNone && !unpack_path_.empty())
base::DeletePathRecursively(unpack_path_);
Result result;
result.error = error_;
result.extended_error = extended_error_;
if (error_ == UnpackerError::kNone) {
result.unpack_path = unpack_path_;
result.public_key = public_key_;
}
base::SequencedTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindOnce(std::move(callback_), result));
}
} // namespace update_client
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