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// Copyright (c) 2014 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.
#include "shell/common/asar/archive.h"
#include <string>
#include <utility>
#include <vector>
#include "base/check.h"
#include "base/files/file.h"
#include "base/files/file_util.h"
#include "base/json/json_reader.h"
#include "base/logging.h"
#include "base/pickle.h"
#include "base/strings/string_number_conversions.h"
#include "base/task/post_task.h"
#include "base/threading/thread_restrictions.h"
#include "base/values.h"
#include "electron/fuses.h"
#include "shell/common/asar/asar_util.h"
#include "shell/common/asar/scoped_temporary_file.h"
#if BUILDFLAG(IS_WIN)
#include <io.h>
#endif
namespace asar {
namespace {
#if BUILDFLAG(IS_WIN)
const char kSeparators[] = "\\/";
#else
const char kSeparators[] = "/";
#endif
bool GetNodeFromPath(std::string path,
const base::DictionaryValue* root,
const base::DictionaryValue** out);
// Gets the "files" from "dir".
bool GetFilesNode(const base::DictionaryValue* root,
const base::DictionaryValue* dir,
const base::DictionaryValue** out) {
// Test for symbol linked directory.
const std::string* link = dir->FindStringKey("link");
if (link != nullptr) {
const base::DictionaryValue* linked_node = nullptr;
if (!GetNodeFromPath(*link, root, &linked_node))
return false;
dir = linked_node;
}
return dir->GetDictionaryWithoutPathExpansion("files", out);
}
// Gets sub-file "name" from "dir".
bool GetChildNode(const base::DictionaryValue* root,
const std::string& name,
const base::DictionaryValue* dir,
const base::DictionaryValue** out) {
if (name.empty()) {
*out = root;
return true;
}
const base::DictionaryValue* files = nullptr;
return GetFilesNode(root, dir, &files) &&
files->GetDictionaryWithoutPathExpansion(name, out);
}
// Gets the node of "path" from "root".
bool GetNodeFromPath(std::string path,
const base::DictionaryValue* root,
const base::DictionaryValue** out) {
if (path.empty()) {
*out = root;
return true;
}
const base::DictionaryValue* dir = root;
for (size_t delimiter_position = path.find_first_of(kSeparators);
delimiter_position != std::string::npos;
delimiter_position = path.find_first_of(kSeparators)) {
const base::DictionaryValue* child = nullptr;
if (!GetChildNode(root, path.substr(0, delimiter_position), dir, &child))
return false;
dir = child;
path.erase(0, delimiter_position + 1);
}
return GetChildNode(root, path, dir, out);
}
bool FillFileInfoWithNode(Archive::FileInfo* info,
uint32_t header_size,
bool load_integrity,
const base::DictionaryValue* node) {
if (auto size = node->FindIntKey("size")) {
info->size = static_cast<uint32_t>(size.value());
} else {
return false;
}
if (auto unpacked = node->FindBoolKey("unpacked")) {
info->unpacked = unpacked.value();
if (info->unpacked) {
return true;
}
}
auto* offset = node->FindStringKey("offset");
if (offset &&
base::StringToUint64(base::StringPiece(*offset), &info->offset)) {
info->offset += header_size;
} else {
return false;
}
if (auto executable = node->FindBoolKey("executable")) {
info->executable = executable.value();
}
#if BUILDFLAG(IS_MAC)
if (load_integrity &&
electron::fuses::IsEmbeddedAsarIntegrityValidationEnabled()) {
if (auto* integrity = node->FindDictKey("integrity")) {
auto* algorithm = integrity->FindStringKey("algorithm");
auto* hash = integrity->FindStringKey("hash");
auto block_size = integrity->FindIntKey("blockSize");
auto* blocks = integrity->FindListKey("blocks");
if (algorithm && hash && block_size && block_size > 0 && blocks) {
IntegrityPayload integrity_payload;
integrity_payload.hash = *hash;
integrity_payload.block_size =
static_cast<uint32_t>(block_size.value());
for (auto& value : blocks->GetListDeprecated()) {
if (auto* block = value.GetIfString()) {
integrity_payload.blocks.push_back(*block);
} else {
LOG(FATAL)
<< "Invalid block integrity value for file in ASAR archive";
}
}
if (*algorithm == "SHA256") {
integrity_payload.algorithm = HashAlgorithm::SHA256;
info->integrity = std::move(integrity_payload);
}
}
}
if (!info->integrity.has_value()) {
LOG(FATAL) << "Failed to read integrity for file in ASAR archive";
return false;
}
}
#endif
return true;
}
} // namespace
IntegrityPayload::IntegrityPayload()
: algorithm(HashAlgorithm::NONE), block_size(0) {}
IntegrityPayload::~IntegrityPayload() = default;
IntegrityPayload::IntegrityPayload(const IntegrityPayload& other) = default;
Archive::FileInfo::FileInfo()
: unpacked(false), executable(false), size(0), offset(0) {}
Archive::FileInfo::~FileInfo() = default;
Archive::Archive(const base::FilePath& path)
: initialized_(false), path_(path), file_(base::File::FILE_OK) {
base::ThreadRestrictions::ScopedAllowIO allow_io;
file_.Initialize(path_, base::File::FLAG_OPEN | base::File::FLAG_READ);
#if BUILDFLAG(IS_WIN)
fd_ = _open_osfhandle(reinterpret_cast<intptr_t>(file_.GetPlatformFile()), 0);
#elif BUILDFLAG(IS_POSIX)
fd_ = file_.GetPlatformFile();
#endif
}
Archive::~Archive() {
#if BUILDFLAG(IS_WIN)
if (fd_ != -1) {
_close(fd_);
// Don't close the handle since we already closed the fd.
file_.TakePlatformFile();
}
#endif
base::ThreadRestrictions::ScopedAllowIO allow_io;
file_.Close();
}
bool Archive::Init() {
// Should only be initialized once
CHECK(!initialized_);
initialized_ = true;
if (!file_.IsValid()) {
if (file_.error_details() != base::File::FILE_ERROR_NOT_FOUND) {
LOG(WARNING) << "Opening " << path_.value() << ": "
<< base::File::ErrorToString(file_.error_details());
}
return false;
}
std::vector<char> buf;
int len;
buf.resize(8);
{
base::ThreadRestrictions::ScopedAllowIO allow_io;
len = file_.ReadAtCurrentPos(buf.data(), buf.size());
}
if (len != static_cast<int>(buf.size())) {
PLOG(ERROR) << "Failed to read header size from " << path_.value();
return false;
}
uint32_t size;
if (!base::PickleIterator(base::Pickle(buf.data(), buf.size()))
.ReadUInt32(&size)) {
LOG(ERROR) << "Failed to parse header size from " << path_.value();
return false;
}
buf.resize(size);
{
base::ThreadRestrictions::ScopedAllowIO allow_io;
len = file_.ReadAtCurrentPos(buf.data(), buf.size());
}
if (len != static_cast<int>(buf.size())) {
PLOG(ERROR) << "Failed to read header from " << path_.value();
return false;
}
std::string header;
if (!base::PickleIterator(base::Pickle(buf.data(), buf.size()))
.ReadString(&header)) {
LOG(ERROR) << "Failed to parse header from " << path_.value();
return false;
}
#if BUILDFLAG(IS_MAC)
// Validate header signature if required and possible
if (electron::fuses::IsEmbeddedAsarIntegrityValidationEnabled() &&
RelativePath().has_value()) {
absl::optional<IntegrityPayload> integrity = HeaderIntegrity();
if (!integrity.has_value()) {
LOG(FATAL) << "Failed to get integrity for validatable asar archive: "
<< RelativePath().value();
return false;
}
// Currently we only support the sha256 algorithm, we can add support for
// more below ensure we read them in preference order from most secure to
// least
if (integrity.value().algorithm != HashAlgorithm::NONE) {
ValidateIntegrityOrDie(header.c_str(), header.length(),
integrity.value());
} else {
LOG(FATAL) << "No eligible hash for validatable asar archive: "
<< RelativePath().value();
}
header_validated_ = true;
}
#endif
absl::optional<base::Value> value = base::JSONReader::Read(header);
if (!value || !value->is_dict()) {
LOG(ERROR) << "Failed to parse header";
return false;
}
header_size_ = 8 + size;
header_ = base::DictionaryValue::From(
base::Value::ToUniquePtrValue(std::move(*value)));
return true;
}
#if !BUILDFLAG(IS_MAC)
absl::optional<IntegrityPayload> Archive::HeaderIntegrity() const {
return absl::nullopt;
}
absl::optional<base::FilePath> Archive::RelativePath() const {
return absl::nullopt;
}
#endif
bool Archive::GetFileInfo(const base::FilePath& path, FileInfo* info) const {
if (!header_)
return false;
const base::DictionaryValue* node;
if (!GetNodeFromPath(path.AsUTF8Unsafe(), header_.get(), &node))
return false;
std::string link;
if (node->GetString("link", &link))
return GetFileInfo(base::FilePath::FromUTF8Unsafe(link), info);
return FillFileInfoWithNode(info, header_size_, header_validated_, node);
}
bool Archive::Stat(const base::FilePath& path, Stats* stats) const {
if (!header_)
return false;
const base::DictionaryValue* node;
if (!GetNodeFromPath(path.AsUTF8Unsafe(), header_.get(), &node))
return false;
if (node->FindKey("link")) {
stats->is_file = false;
stats->is_link = true;
return true;
}
if (node->FindKey("files")) {
stats->is_file = false;
stats->is_directory = true;
return true;
}
return FillFileInfoWithNode(stats, header_size_, header_validated_, node);
}
bool Archive::Readdir(const base::FilePath& path,
std::vector<base::FilePath>* files) const {
if (!header_)
return false;
const base::DictionaryValue* node;
if (!GetNodeFromPath(path.AsUTF8Unsafe(), header_.get(), &node))
return false;
const base::DictionaryValue* files_node;
if (!GetFilesNode(header_.get(), node, &files_node))
return false;
base::DictionaryValue::Iterator iter(*files_node);
while (!iter.IsAtEnd()) {
files->push_back(base::FilePath::FromUTF8Unsafe(iter.key()));
iter.Advance();
}
return true;
}
bool Archive::Realpath(const base::FilePath& path,
base::FilePath* realpath) const {
if (!header_)
return false;
const base::DictionaryValue* node;
if (!GetNodeFromPath(path.AsUTF8Unsafe(), header_.get(), &node))
return false;
std::string link;
if (node->GetString("link", &link)) {
*realpath = base::FilePath::FromUTF8Unsafe(link);
return true;
}
*realpath = path;
return true;
}
bool Archive::CopyFileOut(const base::FilePath& path, base::FilePath* out) {
if (!header_)
return false;
base::AutoLock auto_lock(external_files_lock_);
auto it = external_files_.find(path.value());
if (it != external_files_.end()) {
*out = it->second->path();
return true;
}
FileInfo info;
if (!GetFileInfo(path, &info))
return false;
if (info.unpacked) {
*out = path_.AddExtension(FILE_PATH_LITERAL("unpacked")).Append(path);
return true;
}
auto temp_file = std::make_unique<ScopedTemporaryFile>();
base::FilePath::StringType ext = path.Extension();
if (!temp_file->InitFromFile(&file_, ext, info.offset, info.size,
info.integrity))
return false;
#if BUILDFLAG(IS_POSIX)
if (info.executable) {
// chmod a+x temp_file;
base::SetPosixFilePermissions(temp_file->path(), 0755);
}
#endif
*out = temp_file->path();
external_files_[path.value()] = std::move(temp_file);
return true;
}
int Archive::GetUnsafeFD() const {
return fd_;
}
} // namespace asar