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// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <algorithm>
#include <cstring>
#include <optional>
#include <utility>
#include "common/logging/log.h"
#include "common/polyfill_ranges.h"
#include "core/crypto/aes_util.h"
#include "core/crypto/ctr_encryption_layer.h"
#include "core/crypto/key_manager.h"
#include "core/file_sys/content_archive.h"
#include "core/file_sys/partition_filesystem.h"
#include "core/file_sys/vfs/vfs_offset.h"
#include "core/loader/loader.h"
#include "core/file_sys/fssystem/fssystem_compression_configuration.h"
#include "core/file_sys/fssystem/fssystem_crypto_configuration.h"
#include "core/file_sys/fssystem/fssystem_nca_file_system_driver.h"
namespace FileSys {
static u8 MasterKeyIdForKeyGeneration(u8 key_generation) {
return std::max<u8>(key_generation, 1) - 1;
}
NCA::NCA(VirtualFile file_, const NCA* base_nca)
: file(std::move(file_)), keys{Core::Crypto::KeyManager::Instance()} {
if (file == nullptr) {
status = Loader::ResultStatus::ErrorNullFile;
return;
}
reader = std::make_shared<NcaReader>();
if (Result rc =
reader->Initialize(file, GetCryptoConfiguration(), GetNcaCompressionConfiguration());
R_FAILED(rc)) {
if (rc != ResultInvalidNcaSignature) {
LOG_ERROR(Loader, "File reader errored out during header read: {:#x}",
rc.GetInnerValue());
}
status = Loader::ResultStatus::ErrorBadNCAHeader;
return;
}
// Ensure we have the proper key area keys to continue.
const u8 master_key_id = MasterKeyIdForKeyGeneration(reader->GetKeyGeneration());
if (!keys.HasKey(Core::Crypto::S128KeyType::KeyArea, master_key_id, reader->GetKeyIndex())) {
status = Loader::ResultStatus::ErrorMissingKeyAreaKey;
return;
}
RightsId rights_id{};
reader->GetRightsId(rights_id.data(), rights_id.size());
if (rights_id != RightsId{}) {
// External decryption key required; provide it here.
u128 rights_id_u128;
std::memcpy(rights_id_u128.data(), rights_id.data(), sizeof(rights_id));
auto titlekey =
keys.GetKey(Core::Crypto::S128KeyType::Titlekey, rights_id_u128[1], rights_id_u128[0]);
if (titlekey == Core::Crypto::Key128{}) {
status = Loader::ResultStatus::ErrorMissingTitlekey;
return;
}
if (!keys.HasKey(Core::Crypto::S128KeyType::Titlekek, master_key_id)) {
status = Loader::ResultStatus::ErrorMissingTitlekek;
return;
}
auto titlekek = keys.GetKey(Core::Crypto::S128KeyType::Titlekek, master_key_id);
Core::Crypto::AESCipher<Core::Crypto::Key128> cipher(titlekek, Core::Crypto::Mode::ECB);
cipher.Transcode(titlekey.data(), titlekey.size(), titlekey.data(),
Core::Crypto::Op::Decrypt);
reader->SetExternalDecryptionKey(titlekey.data(), titlekey.size());
}
const s32 fs_count = reader->GetFsCount();
NcaFileSystemDriver fs(base_nca ? base_nca->reader : nullptr, reader);
std::vector<VirtualFile> filesystems(fs_count);
for (s32 i = 0; i < fs_count; i++) {
NcaFsHeaderReader header_reader;
const Result rc = fs.OpenStorage(&filesystems[i], &header_reader, i);
if (R_FAILED(rc)) {
LOG_ERROR(Loader, "File reader errored out during read of section {}: {:#x}", i,
rc.GetInnerValue());
status = Loader::ResultStatus::ErrorBadNCAHeader;
return;
}
if (header_reader.GetFsType() == NcaFsHeader::FsType::RomFs) {
files.push_back(filesystems[i]);
romfs = files.back();
}
if (header_reader.GetFsType() == NcaFsHeader::FsType::PartitionFs) {
auto npfs = std::make_shared<PartitionFilesystem>(filesystems[i]);
if (npfs->GetStatus() == Loader::ResultStatus::Success) {
dirs.push_back(npfs);
if (IsDirectoryExeFS(npfs)) {
exefs = dirs.back();
} else if (IsDirectoryLogoPartition(npfs)) {
logo = dirs.back();
} else {
continue;
}
}
}
if (header_reader.GetEncryptionType() == NcaFsHeader::EncryptionType::AesCtrEx) {
is_update = true;
}
}
if (is_update && base_nca == nullptr) {
status = Loader::ResultStatus::ErrorMissingBKTRBaseRomFS;
} else {
status = Loader::ResultStatus::Success;
}
}
NCA::~NCA() = default;
Loader::ResultStatus NCA::GetStatus() const {
return status;
}
std::vector<VirtualFile> NCA::GetFiles() const {
if (status != Loader::ResultStatus::Success) {
return {};
}
return files;
}
std::vector<VirtualDir> NCA::GetSubdirectories() const {
if (status != Loader::ResultStatus::Success) {
return {};
}
return dirs;
}
std::string NCA::GetName() const {
return file->GetName();
}
VirtualDir NCA::GetParentDirectory() const {
return file->GetContainingDirectory();
}
NCAContentType NCA::GetType() const {
return static_cast<NCAContentType>(reader->GetContentType());
}
u64 NCA::GetTitleId() const {
if (is_update) {
return reader->GetProgramId() | 0x800;
}
return reader->GetProgramId();
}
RightsId NCA::GetRightsId() const {
RightsId result;
reader->GetRightsId(result.data(), result.size());
return result;
}
u32 NCA::GetSDKVersion() const {
return reader->GetSdkAddonVersion();
}
bool NCA::IsUpdate() const {
return is_update;
}
VirtualFile NCA::GetRomFS() const {
return romfs;
}
VirtualDir NCA::GetExeFS() const {
return exefs;
}
VirtualFile NCA::GetBaseFile() const {
return file;
}
VirtualDir NCA::GetLogoPartition() const {
return logo;
}
} // namespace FileSys
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