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file_sys: Implement NAX containers
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@ -20,6 +20,8 @@ add_library(core STATIC
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crypto/key_manager.h
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crypto/ctr_encryption_layer.cpp
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crypto/ctr_encryption_layer.h
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crypto/xts_encryption_layer.cpp
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crypto/xts_encryption_layer.h
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file_sys/bis_factory.cpp
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file_sys/bis_factory.h
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file_sys/card_image.cpp
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@ -57,6 +59,8 @@ add_library(core STATIC
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file_sys/vfs_real.h
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file_sys/vfs_vector.cpp
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file_sys/vfs_vector.h
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file_sys/xts_archive.cpp
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file_sys/xts_archive.h
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frontend/emu_window.cpp
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frontend/emu_window.h
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frontend/framebuffer_layout.cpp
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@ -347,6 +351,8 @@ add_library(core STATIC
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loader/linker.h
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loader/loader.cpp
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loader/loader.h
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loader/nax.cpp
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loader/nax.h
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loader/nca.cpp
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loader/nca.h
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loader/nro.cpp
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164
src/core/file_sys/xts_archive.cpp
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164
src/core/file_sys/xts_archive.cpp
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@ -0,0 +1,164 @@
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// Copyright 2018 yuzu emulator team
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <array>
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#include <regex>
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#include <string>
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#include <mbedtls/md.h>
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#include <mbedtls/sha256.h>
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#include "common/assert.h"
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#include "common/hex_util.h"
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#include "common/logging/log.h"
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#include "core/crypto/aes_util.h"
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#include "core/crypto/xts_encryption_layer.h"
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#include "core/file_sys/partition_filesystem.h"
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#include "core/file_sys/vfs_offset.h"
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#include "core/file_sys/xts_archive.h"
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#include "core/loader/loader.h"
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namespace FileSys {
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template <typename SourceData, typename SourceKey, typename Destination>
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static bool CalculateHMAC256(Destination* out, const SourceKey* key, size_t key_length,
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const SourceData* data, size_t data_length) {
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mbedtls_md_context_t context;
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mbedtls_md_init(&context);
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const auto key_f = reinterpret_cast<const u8*>(key);
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const std::vector<u8> key_v(key_f, key_f + key_length);
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if (mbedtls_md_setup(&context, mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), 1) ||
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mbedtls_md_hmac_starts(&context, reinterpret_cast<const u8*>(key), key_length) ||
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mbedtls_md_hmac_update(&context, reinterpret_cast<const u8*>(data), data_length) ||
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mbedtls_md_hmac_finish(&context, reinterpret_cast<u8*>(out))) {
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mbedtls_md_free(&context);
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return false;
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}
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mbedtls_md_free(&context);
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return true;
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}
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NAX::NAX(VirtualFile file_) : file(std::move(file_)), header(std::make_unique<NAXHeader>()) {
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std::string path = FileUtil::SanitizePath(file->GetFullPath());
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static const std::regex nax_path_regex("/registered/(000000[0-9A-F]{2})/([0-9A-F]{32})\\.nca",
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std::regex_constants::ECMAScript |
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std::regex_constants::icase);
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std::smatch match;
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if (!std::regex_search(path, match, nax_path_regex)) {
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status = Loader::ResultStatus::ErrorBadNAXFilePath;
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return;
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}
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std::string two_dir = match[1];
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std::string nca_id = match[2];
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std::transform(two_dir.begin(), two_dir.end(), two_dir.begin(), ::toupper);
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std::transform(nca_id.begin(), nca_id.end(), nca_id.begin(), ::tolower);
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status = Parse(fmt::format("/registered/{}/{}.nca", two_dir, nca_id));
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}
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NAX::NAX(VirtualFile file_, std::array<u8, 0x10> nca_id)
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: file(std::move(file_)), header(std::make_unique<NAXHeader>()) {
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Core::Crypto::SHA256Hash hash{};
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mbedtls_sha256(nca_id.data(), nca_id.size(), hash.data(), 0);
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status = Parse(fmt::format("/registered/000000{:02X}/{}.nca", hash[0],
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Common::HexArrayToString(nca_id, false)));
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}
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Loader::ResultStatus NAX::Parse(std::string path) {
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if (file->ReadObject(header.get()) != sizeof(NAXHeader))
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return Loader::ResultStatus::ErrorBadNAXHeader;
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if (header->magic != Common::MakeMagic('N', 'A', 'X', '0'))
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return Loader::ResultStatus::ErrorBadNAXHeader;
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if (file->GetSize() < 0x4000 + header->file_size)
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return Loader::ResultStatus::ErrorIncorrectNAXFileSize;
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keys.DeriveSDSeedLazy();
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std::array<Core::Crypto::Key256, 2> sd_keys{};
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const auto sd_keys_res = Core::Crypto::DeriveSDKeys(sd_keys, keys);
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if (sd_keys_res != Loader::ResultStatus::Success) {
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return sd_keys_res;
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}
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const auto enc_keys = header->key_area;
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size_t i = 0;
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for (; i < 2; ++i) {
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std::array<Core::Crypto::Key128, 2> nax_keys{};
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if (!CalculateHMAC256(nax_keys.data(), sd_keys[i].data(), 0x10, path.c_str(),
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path.size())) {
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return Loader::ResultStatus::ErrorNAXKeyHMACFailed;
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}
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for (size_t j = 0; j < 2; ++j) {
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Core::Crypto::AESCipher<Core::Crypto::Key128> cipher(nax_keys[j],
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Core::Crypto::Mode::ECB);
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cipher.Transcode(enc_keys[j].data(), 0x10, header->key_area[j].data(),
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Core::Crypto::Op::Decrypt);
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}
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Core::Crypto::SHA256Hash validation{};
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if (!CalculateHMAC256(validation.data(), &header->magic, 0x60, sd_keys[i].data() + 0x10,
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0x10)) {
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return Loader::ResultStatus::ErrorNAXValidationHMACFailed;
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}
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if (header->hmac == validation)
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break;
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}
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if (i == 2) {
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return Loader::ResultStatus::ErrorNAXKeyDerivationFailed;
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}
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type = static_cast<NAXContentType>(i);
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Core::Crypto::Key256 final_key{};
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memcpy(final_key.data(), &header->key_area, 0x20);
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const auto enc_file = std::make_shared<OffsetVfsFile>(file, header->file_size, 0x4000);
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dec_file = std::make_shared<Core::Crypto::XTSEncryptionLayer>(enc_file, final_key);
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return Loader::ResultStatus::Success;
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}
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Loader::ResultStatus NAX::GetStatus() {
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return status;
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}
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VirtualFile NAX::GetDecrypted() {
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return dec_file;
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}
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std::shared_ptr<NCA> NAX::AsNCA() {
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if (type == NAXContentType::NCA)
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return std::make_shared<NCA>(GetDecrypted());
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return nullptr;
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}
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NAXContentType NAX::GetContentType() {
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return type;
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}
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std::vector<std::shared_ptr<VfsFile>> NAX::GetFiles() const {
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return {dec_file};
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}
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std::vector<std::shared_ptr<VfsDirectory>> NAX::GetSubdirectories() const {
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return {};
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}
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std::string NAX::GetName() const {
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return file->GetName();
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}
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std::shared_ptr<VfsDirectory> NAX::GetParentDirectory() const {
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return file->GetContainingDirectory();
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}
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bool NAX::ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) {
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return false;
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}
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} // namespace FileSys
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68
src/core/file_sys/xts_archive.h
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68
src/core/file_sys/xts_archive.h
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@ -0,0 +1,68 @@
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// Copyright 2018 yuzu emulator team
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <array>
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#include <vector>
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#include "common/common_types.h"
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#include "common/swap.h"
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#include "core/file_sys/content_archive.h"
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#include "core/file_sys/vfs.h"
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#include "core/loader/loader.h"
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namespace FileSys {
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struct NAXHeader {
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std::array<u8, 0x20> hmac;
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u64_le magic;
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std::array<Core::Crypto::Key128, 2> key_area;
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u64_le file_size;
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INSERT_PADDING_BYTES(0x30);
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};
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static_assert(sizeof(NAXHeader) == 0x80, "NAXHeader has incorrect size.");
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enum class NAXContentType : u8 {
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Save = 0,
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NCA = 1,
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};
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class NAX : public ReadOnlyVfsDirectory {
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public:
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explicit NAX(VirtualFile file);
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explicit NAX(VirtualFile file, std::array<u8, 0x10> nca_id);
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Loader::ResultStatus GetStatus();
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VirtualFile GetDecrypted();
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std::shared_ptr<NCA> AsNCA();
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NAXContentType GetContentType();
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std::vector<std::shared_ptr<VfsFile>> GetFiles() const override;
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std::vector<std::shared_ptr<VfsDirectory>> GetSubdirectories() const override;
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std::string GetName() const override;
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std::shared_ptr<VfsDirectory> GetParentDirectory() const override;
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protected:
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bool ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) override;
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private:
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Loader::ResultStatus Parse(std::string path);
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std::unique_ptr<NAXHeader> header;
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VirtualFile file;
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Loader::ResultStatus status;
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NAXContentType type;
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VirtualFile dec_file;
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Core::Crypto::KeyManager keys;
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};
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} // namespace FileSys
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