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// Copyright 2014 The Chromium Authors. All rights reserved.
// 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 <vector>
#include "base/base64.h"
#include "base/bind.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/json/json_file_value_serializer.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/values.h"
#include "components/crx_file/crx_file.h"
#include "components/update_client/component_patcher.h"
#include "components/update_client/component_patcher_operation.h"
#include "components/update_client/update_client.h"
#include "crypto/secure_hash.h"
#include "crypto/sha2.h"
#include "third_party/zlib/google/zip.h"
using crypto::SecureHash;
using crx_file::CrxFile;
namespace update_client {
ComponentUnpacker::ComponentUnpacker(
const std::vector<uint8_t>& pk_hash,
const base::FilePath& path,
const std::string& fingerprint,
const scoped_refptr<CrxInstaller>& installer,
const scoped_refptr<OutOfProcessPatcher>& oop_patcher,
const scoped_refptr<base::SequencedTaskRunner>& task_runner)
: pk_hash_(pk_hash),
path_(path),
is_delta_(false),
fingerprint_(fingerprint),
installer_(installer),
oop_patcher_(oop_patcher),
error_(kNone),
extended_error_(0),
task_runner_(task_runner) {
}
// TODO(cpu): add a specific attribute check to a component json that the
// extension unpacker will reject, so that a component cannot be installed
// as an extension.
scoped_ptr<base::DictionaryValue> ReadManifest(
const base::FilePath& unpack_path) {
base::FilePath manifest =
unpack_path.Append(FILE_PATH_LITERAL("manifest.json"));
if (!base::PathExists(manifest))
return scoped_ptr<base::DictionaryValue>();
JSONFileValueDeserializer deserializer(manifest);
std::string error;
scoped_ptr<base::Value> root = deserializer.Deserialize(NULL, &error);
if (!root.get())
return scoped_ptr<base::DictionaryValue>();
if (!root->IsType(base::Value::TYPE_DICTIONARY))
return scoped_ptr<base::DictionaryValue>();
return scoped_ptr<base::DictionaryValue>(
static_cast<base::DictionaryValue*>(root.release()));
}
bool ComponentUnpacker::UnpackInternal() {
return Verify() && Unzip() && BeginPatching();
}
void ComponentUnpacker::Unpack(const Callback& callback) {
callback_ = callback;
if (!UnpackInternal())
Finish();
}
bool ComponentUnpacker::Verify() {
VLOG(1) << "Verifying component: " << path_.value();
if (pk_hash_.empty() || path_.empty()) {
error_ = kInvalidParams;
return false;
}
// First, validate the CRX header and signature. As of today
// this is SHA1 with RSA 1024.
std::string public_key_bytes;
std::string public_key_base64;
CrxFile::Header header;
CrxFile::ValidateError error = CrxFile::ValidateSignature(
path_, std::string(), &public_key_base64, nullptr, &header);
if (error != CrxFile::ValidateError::NONE ||
!base::Base64Decode(public_key_base64, &public_key_bytes)) {
error_ = kInvalidFile;
return false;
}
is_delta_ = CrxFile::HeaderIsDelta(header);
// File is valid and the digital signature matches. Now make sure
// the public key hash matches the expected hash. If they do we fully
// trust this CRX.
uint8_t hash[crypto::kSHA256Length] = {};
scoped_ptr<SecureHash> sha256(SecureHash::Create(SecureHash::SHA256));
sha256->Update(public_key_bytes.data(), public_key_bytes.size());
sha256->Finish(hash, arraysize(hash));
if (!std::equal(pk_hash_.begin(), pk_hash_.end(), hash)) {
VLOG(1) << "Hash mismatch: " << path_.value();
error_ = kInvalidId;
return false;
}
VLOG(1) << "Verification successful: " << path_.value();
return true;
}
bool ComponentUnpacker::Unzip() {
base::FilePath& destination = is_delta_ ? unpack_diff_path_ : unpack_path_;
VLOG(1) << "Unpacking in: " << destination.value();
if (!base::CreateNewTempDirectory(base::FilePath::StringType(),
&destination)) {
VLOG(1) << "Unable to create temporary directory for unpacking.";
error_ = kUnzipPathError;
return false;
}
if (!zip::Unzip(path_, destination)) {
VLOG(1) << "Unzipping failed.";
error_ = kUnzipFailed;
return false;
}
VLOG(1) << "Unpacked successfully";
return true;
}
bool ComponentUnpacker::BeginPatching() {
if (is_delta_) { // Package is a diff package.
// Use a different temp directory for the patch output files.
if (!base::CreateNewTempDirectory(base::FilePath::StringType(),
&unpack_path_)) {
error_ = kUnzipPathError;
return false;
}
patcher_ = new ComponentPatcher(unpack_diff_path_, unpack_path_, installer_,
oop_patcher_, task_runner_);
task_runner_->PostTask(
FROM_HERE,
base::Bind(&ComponentPatcher::Start, patcher_,
base::Bind(&ComponentUnpacker::EndPatching,
scoped_refptr<ComponentUnpacker>(this))));
} else {
task_runner_->PostTask(
FROM_HERE,
base::Bind(&ComponentUnpacker::EndPatching,
scoped_refptr<ComponentUnpacker>(this), kNone, 0));
}
return true;
}
void ComponentUnpacker::EndPatching(Error error, int extended_error) {
error_ = error;
extended_error_ = extended_error;
patcher_ = NULL;
if (error_ != kNone) {
Finish();
return;
}
// Optimization: clean up patch files early, in case disk space is too low to
// install otherwise.
if (!unpack_diff_path_.empty()) {
base::DeleteFile(unpack_diff_path_, true);
unpack_diff_path_.clear();
}
Install();
Finish();
}
void ComponentUnpacker::Install() {
// Write the fingerprint to disk.
if (static_cast<int>(fingerprint_.size()) !=
base::WriteFile(
unpack_path_.Append(FILE_PATH_LITERAL("manifest.fingerprint")),
fingerprint_.c_str(), base::checked_cast<int>(fingerprint_.size()))) {
error_ = kFingerprintWriteFailed;
return;
}
scoped_ptr<base::DictionaryValue> manifest(ReadManifest(unpack_path_));
if (!manifest.get()) {
error_ = kBadManifest;
return;
}
DCHECK(error_ == kNone);
if (!installer_->Install(*manifest, unpack_path_)) {
error_ = kInstallerError;
return;
}
}
void ComponentUnpacker::Finish() {
if (!unpack_diff_path_.empty())
base::DeleteFile(unpack_diff_path_, true);
if (!unpack_path_.empty())
base::DeleteFile(unpack_path_, true);
task_runner_->PostTask(FROM_HERE,
base::Bind(callback_, error_, extended_error_));
}
ComponentUnpacker::~ComponentUnpacker() {
}
} // namespace update_client
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