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// Copyright 2022 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/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/functional/bind.h"
#include "base/functional/callback.h"
#include "base/logging.h"
#include "base/memory/scoped_refptr.h"
#include "base/sequence_checker.h"
#include "base/task/sequenced_task_runner.h"
#include "components/crx_file/crx_verifier.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 {
constexpr 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 {
Unpacker::Result::Result() = default;
Unpacker::Unpacker(const base::FilePath& path,
std::unique_ptr<Unzipper> unzipper,
base::OnceCallback<void(const Result& result)> callback)
: path_(path),
unzipper_(std::move(unzipper)),
callback_(std::move(callback)) {}
Unpacker::~Unpacker() = default;
void Unpacker::Unpack(const std::vector<uint8_t>& pk_hash,
const base::FilePath& path,
std::unique_ptr<Unzipper> unzipper,
crx_file::VerifierFormat crx_format,
base::OnceCallback<void(const Result& result)> callback) {
base::WrapRefCounted(
new Unpacker(path, std::move(unzipper), std::move(callback)))
->Verify(pk_hash, crx_format);
}
void Unpacker::Verify(const std::vector<uint8_t>& pk_hash,
crx_file::VerifierFormat crx_format) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
VLOG(1) << "Verifying component: " << path_.value();
if (path_.empty()) {
EndUnpacking(UnpackerError::kInvalidParams, 0);
return;
}
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_,
/*crx_id=*/nullptr, &compressed_verified_contents_);
if (result != crx_file::VerifierResult::OK_FULL) {
EndUnpacking(UnpackerError::kInvalidFile, static_cast<int>(result));
return;
}
VLOG(2) << "Verification successful: " << path_.value();
BeginUnzipping();
}
void Unpacker::BeginUnzipping() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!base::CreateNewTempDirectory(
FILE_PATH_LITERAL("chrome_Unpacker_BeginUnzipping"), &unpack_path_)) {
VLOG(1) << "Unable to create temporary directory for unpacking.";
EndUnpacking(UnpackerError::kUnzipPathError,
::logging::GetLastSystemErrorCode());
return;
}
VLOG(1) << "Unpacking in: " << unpack_path_.value();
unzipper_->Unzip(path_, unpack_path_,
base::BindOnce(&Unpacker::EndUnzipping, this));
}
void Unpacker::EndUnzipping(bool result) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!result) {
VLOG(1) << "Unzipping failed.";
EndUnpacking(UnpackerError::kUnzipFailed, 0);
return;
}
VLOG(2) << "Unzipped successfully";
// Ignore the verified contents in the header if the verified
// contents are already present in the _metadata folder.
if (compressed_verified_contents_.empty() ||
base::PathExists(GetVerifiedContentsPath(unpack_path_))) {
EndUnpacking(UnpackerError::kNone);
return;
}
UncompressVerifiedContents();
}
void Unpacker::UncompressVerifiedContents() {
std::string verified_contents;
if (!compression::GzipUncompress(compressed_verified_contents_,
&verified_contents)) {
VLOG(1) << "Decompressing verified contents from header failed";
EndUnpacking(UnpackerError::kNone);
return;
}
StoreVerifiedContentsInExtensionDir(verified_contents);
}
void Unpacker::StoreVerifiedContentsInExtensionDir(
const std::string& verified_contents) {
base::FilePath metadata_path = unpack_path_.Append(kMetadataFolder);
if (!base::CreateDirectory(metadata_path)) {
VLOG(1) << "Could not create metadata directory " << metadata_path;
EndUnpacking(UnpackerError::kNone);
return;
}
base::FilePath verified_contents_path = GetVerifiedContentsPath(unpack_path_);
// Cannot write the verified contents file.
if (!base::WriteFile(verified_contents_path, verified_contents)) {
VLOG(1) << "Could not write verified contents into file "
<< verified_contents_path;
EndUnpacking(UnpackerError::kNone);
return;
}
EndUnpacking(UnpackerError::kNone);
}
void Unpacker::EndUnpacking(UnpackerError error, int extended_error) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (error != UnpackerError::kNone && !unpack_path_.empty()) {
RetryDeletePathRecursively(unpack_path_);
}
Result result;
result.error = error;
result.extended_error = extended_error;
if (error == UnpackerError::kNone) {
VLOG(2) << "Unpacked successfully";
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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