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// Copyright 2013 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 "chrome/browser/component_updater/component_patcher_operation.h"
#include <string>
#include <vector>
#include "base/file_util.h"
#include "base/files/memory_mapped_file.h"
#include "base/json/json_file_value_serializer.h"
#include "base/memory/scoped_handle.h"
#include "base/path_service.h"
#include "base/strings/string_number_conversions.h"
#include "chrome/browser/component_updater/component_patcher.h"
#include "chrome/browser/component_updater/component_updater_service.h"
#include "chrome/common/extensions/extension_constants.h"
#include "crypto/secure_hash.h"
#include "crypto/sha2.h"
#include "crypto/signature_verifier.h"
#include "extensions/common/crx_file.h"
#include "third_party/zlib/google/zip.h"
using crypto::SecureHash;
namespace component_updater {
namespace {
const char kInput[] = "input";
const char kOp[] = "op";
const char kOutput[] = "output";
const char kPatch[] = "patch";
const char kSha256[] = "sha256";
} // namespace
DeltaUpdateOp* CreateDeltaUpdateOp(base::DictionaryValue* command) {
std::string operation;
if (!command->GetString(kOp, &operation))
return NULL;
if (operation == "copy")
return new DeltaUpdateOpCopy();
else if (operation == "create")
return new DeltaUpdateOpCreate();
else if (operation == "bsdiff")
return new DeltaUpdateOpPatchBsdiff();
else if (operation == "courgette")
return new DeltaUpdateOpPatchCourgette();
return NULL;
}
DeltaUpdateOp::DeltaUpdateOp() {}
DeltaUpdateOp::~DeltaUpdateOp() {}
ComponentUnpacker::Error DeltaUpdateOp::Run(base::DictionaryValue* command_args,
const base::FilePath& input_dir,
const base::FilePath& unpack_dir,
ComponentPatcher* patcher,
ComponentInstaller* installer,
int* error) {
std::string output_rel_path;
if (!command_args->GetString(kOutput, &output_rel_path) ||
!command_args->GetString(kSha256, &output_sha256_))
return ComponentUnpacker::kDeltaBadCommands;
output_abs_path_ = unpack_dir.Append(
base::FilePath::FromUTF8Unsafe(output_rel_path));
ComponentUnpacker::Error parse_result = DoParseArguments(
command_args, input_dir, installer);
if (parse_result != ComponentUnpacker::kNone)
return parse_result;
const base::FilePath parent = output_abs_path_.DirName();
if (!base::DirectoryExists(parent)) {
if (!base::CreateDirectory(parent))
return ComponentUnpacker::kIoError;
}
ComponentUnpacker::Error run_result = DoRun(patcher, error);
if (run_result != ComponentUnpacker::kNone)
return run_result;
return CheckHash();
}
// Uses the hash as a checksum to confirm that the file now residing in the
// output directory probably has the contents it should.
ComponentUnpacker::Error DeltaUpdateOp::CheckHash() {
std::vector<uint8> expected_hash;
if (!base::HexStringToBytes(output_sha256_, &expected_hash) ||
expected_hash.size() != crypto::kSHA256Length)
return ComponentUnpacker::kDeltaVerificationFailure;
base::MemoryMappedFile output_file_mmapped;
if (!output_file_mmapped.Initialize(output_abs_path_))
return ComponentUnpacker::kDeltaVerificationFailure;
uint8 actual_hash[crypto::kSHA256Length] = {0};
const scoped_ptr<SecureHash> hasher(SecureHash::Create(SecureHash::SHA256));
hasher->Update(output_file_mmapped.data(), output_file_mmapped.length());
hasher->Finish(actual_hash, sizeof(actual_hash));
if (memcmp(actual_hash, &expected_hash[0], sizeof(actual_hash)))
return ComponentUnpacker::kDeltaVerificationFailure;
return ComponentUnpacker::kNone;
}
DeltaUpdateOpCopy::DeltaUpdateOpCopy() {}
ComponentUnpacker::Error DeltaUpdateOpCopy::DoParseArguments(
base::DictionaryValue* command_args,
const base::FilePath& input_dir,
ComponentInstaller* installer) {
std::string input_rel_path;
if (!command_args->GetString(kInput, &input_rel_path))
return ComponentUnpacker::kDeltaBadCommands;
if (!installer->GetInstalledFile(input_rel_path, &input_abs_path_))
return ComponentUnpacker::kDeltaMissingExistingFile;
return ComponentUnpacker::kNone;
}
ComponentUnpacker::Error DeltaUpdateOpCopy::DoRun(ComponentPatcher*,
int* error) {
*error = 0;
if (!base::CopyFile(input_abs_path_, output_abs_path_))
return ComponentUnpacker::kDeltaOperationFailure;
return ComponentUnpacker::kNone;
}
DeltaUpdateOpCreate::DeltaUpdateOpCreate() {}
ComponentUnpacker::Error DeltaUpdateOpCreate::DoParseArguments(
base::DictionaryValue* command_args,
const base::FilePath& input_dir,
ComponentInstaller* installer) {
std::string patch_rel_path;
if (!command_args->GetString(kPatch, &patch_rel_path))
return ComponentUnpacker::kDeltaBadCommands;
patch_abs_path_ = input_dir.Append(
base::FilePath::FromUTF8Unsafe(patch_rel_path));
return ComponentUnpacker::kNone;
}
ComponentUnpacker::Error DeltaUpdateOpCreate::DoRun(ComponentPatcher*,
int* error) {
*error = 0;
if (!base::Move(patch_abs_path_, output_abs_path_))
return ComponentUnpacker::kDeltaOperationFailure;
return ComponentUnpacker::kNone;
}
DeltaUpdateOpPatchBsdiff::DeltaUpdateOpPatchBsdiff() {}
ComponentUnpacker::Error DeltaUpdateOpPatchBsdiff::DoParseArguments(
base::DictionaryValue* command_args,
const base::FilePath& input_dir,
ComponentInstaller* installer) {
std::string patch_rel_path;
std::string input_rel_path;
if (!command_args->GetString(kPatch, &patch_rel_path) ||
!command_args->GetString(kInput, &input_rel_path))
return ComponentUnpacker::kDeltaBadCommands;
if (!installer->GetInstalledFile(input_rel_path, &input_abs_path_))
return ComponentUnpacker::kDeltaMissingExistingFile;
patch_abs_path_ = input_dir.Append(
base::FilePath::FromUTF8Unsafe(patch_rel_path));
return ComponentUnpacker::kNone;
}
ComponentUnpacker::Error DeltaUpdateOpPatchBsdiff::DoRun(
ComponentPatcher* patcher,
int* error) {
*error = 0;
return patcher->Patch(ComponentPatcher::kPatchTypeBsdiff,
input_abs_path_,
patch_abs_path_,
output_abs_path_,
error);
}
DeltaUpdateOpPatchCourgette::DeltaUpdateOpPatchCourgette() {}
ComponentUnpacker::Error DeltaUpdateOpPatchCourgette::DoParseArguments(
base::DictionaryValue* command_args,
const base::FilePath& input_dir,
ComponentInstaller* installer) {
std::string patch_rel_path;
std::string input_rel_path;
if (!command_args->GetString(kPatch, &patch_rel_path) ||
!command_args->GetString(kInput, &input_rel_path))
return ComponentUnpacker::kDeltaBadCommands;
if (!installer->GetInstalledFile(input_rel_path, &input_abs_path_))
return ComponentUnpacker::kDeltaMissingExistingFile;
patch_abs_path_ = input_dir.Append(
base::FilePath::FromUTF8Unsafe(patch_rel_path));
return ComponentUnpacker::kNone;
}
ComponentUnpacker::Error DeltaUpdateOpPatchCourgette::DoRun(
ComponentPatcher* patcher,
int* error) {
*error = 0;
return patcher->Patch(ComponentPatcher::kPatchTypeCourgette,
input_abs_path_,
patch_abs_path_,
output_abs_path_,
error);
}
} // namespace component_updater
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