file_sys: Implement NAX containers

This commit is contained in:
Zach Hilman 2018-08-16 17:08:13 -04:00
parent 8b52d6682a
commit ab44192ab0
3 changed files with 238 additions and 0 deletions

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@ -20,6 +20,8 @@ add_library(core STATIC
crypto/key_manager.h crypto/key_manager.h
crypto/ctr_encryption_layer.cpp crypto/ctr_encryption_layer.cpp
crypto/ctr_encryption_layer.h crypto/ctr_encryption_layer.h
crypto/xts_encryption_layer.cpp
crypto/xts_encryption_layer.h
file_sys/bis_factory.cpp file_sys/bis_factory.cpp
file_sys/bis_factory.h file_sys/bis_factory.h
file_sys/card_image.cpp file_sys/card_image.cpp
@ -57,6 +59,8 @@ add_library(core STATIC
file_sys/vfs_real.h file_sys/vfs_real.h
file_sys/vfs_vector.cpp file_sys/vfs_vector.cpp
file_sys/vfs_vector.h file_sys/vfs_vector.h
file_sys/xts_archive.cpp
file_sys/xts_archive.h
frontend/emu_window.cpp frontend/emu_window.cpp
frontend/emu_window.h frontend/emu_window.h
frontend/framebuffer_layout.cpp frontend/framebuffer_layout.cpp
@ -347,6 +351,8 @@ add_library(core STATIC
loader/linker.h loader/linker.h
loader/loader.cpp loader/loader.cpp
loader/loader.h loader/loader.h
loader/nax.cpp
loader/nax.h
loader/nca.cpp loader/nca.cpp
loader/nca.h loader/nca.h
loader/nro.cpp loader/nro.cpp

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

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@ -0,0 +1,68 @@
// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <array>
#include <vector>
#include "common/common_types.h"
#include "common/swap.h"
#include "core/file_sys/content_archive.h"
#include "core/file_sys/vfs.h"
#include "core/loader/loader.h"
namespace FileSys {
struct NAXHeader {
std::array<u8, 0x20> hmac;
u64_le magic;
std::array<Core::Crypto::Key128, 2> key_area;
u64_le file_size;
INSERT_PADDING_BYTES(0x30);
};
static_assert(sizeof(NAXHeader) == 0x80, "NAXHeader has incorrect size.");
enum class NAXContentType : u8 {
Save = 0,
NCA = 1,
};
class NAX : public ReadOnlyVfsDirectory {
public:
explicit NAX(VirtualFile file);
explicit NAX(VirtualFile file, std::array<u8, 0x10> nca_id);
Loader::ResultStatus GetStatus();
VirtualFile GetDecrypted();
std::shared_ptr<NCA> AsNCA();
NAXContentType GetContentType();
std::vector<std::shared_ptr<VfsFile>> GetFiles() const override;
std::vector<std::shared_ptr<VfsDirectory>> GetSubdirectories() const override;
std::string GetName() const override;
std::shared_ptr<VfsDirectory> GetParentDirectory() const override;
protected:
bool ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) override;
private:
Loader::ResultStatus Parse(std::string path);
std::unique_ptr<NAXHeader> header;
VirtualFile file;
Loader::ResultStatus status;
NAXContentType type;
VirtualFile dec_file;
Core::Crypto::KeyManager keys;
};
} // namespace FileSys