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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <cstring>
#include <optional>
#include <utility>
#include "common/logging/log.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/nca_patch.h"
#include "core/file_sys/partition_filesystem.h"
#include "core/file_sys/vfs_offset.h"
#include "core/loader/loader.h"
namespace FileSys {
// Media offsets in headers are stored divided by 512. Mult. by this to get real offset.
constexpr u64 MEDIA_OFFSET_MULTIPLIER = 0x200;
constexpr u64 SECTION_HEADER_SIZE = 0x200;
constexpr u64 SECTION_HEADER_OFFSET = 0x400;
constexpr u32 IVFC_MAX_LEVEL = 6;
enum class NCASectionFilesystemType : u8 {
PFS0 = 0x2,
ROMFS = 0x3,
};
struct IVFCLevel {
u64_le offset;
u64_le size;
u32_le block_size;
u32_le reserved;
};
static_assert(sizeof(IVFCLevel) == 0x18, "IVFCLevel has incorrect size.");
struct IVFCHeader {
u32_le magic;
u32_le magic_number;
INSERT_PADDING_BYTES_NOINIT(8);
std::array<IVFCLevel, 6> levels;
INSERT_PADDING_BYTES_NOINIT(64);
};
static_assert(sizeof(IVFCHeader) == 0xE0, "IVFCHeader has incorrect size.");
struct NCASectionHeaderBlock {
INSERT_PADDING_BYTES_NOINIT(3);
NCASectionFilesystemType filesystem_type;
NCASectionCryptoType crypto_type;
INSERT_PADDING_BYTES_NOINIT(3);
};
static_assert(sizeof(NCASectionHeaderBlock) == 0x8, "NCASectionHeaderBlock has incorrect size.");
struct NCASectionRaw {
NCASectionHeaderBlock header;
std::array<u8, 0x138> block_data;
std::array<u8, 0x8> section_ctr;
INSERT_PADDING_BYTES_NOINIT(0xB8);
};
static_assert(sizeof(NCASectionRaw) == 0x200, "NCASectionRaw has incorrect size.");
struct PFS0Superblock {
NCASectionHeaderBlock header_block;
std::array<u8, 0x20> hash;
u32_le size;
INSERT_PADDING_BYTES_NOINIT(4);
u64_le hash_table_offset;
u64_le hash_table_size;
u64_le pfs0_header_offset;
u64_le pfs0_size;
INSERT_PADDING_BYTES_NOINIT(0x1B0);
};
static_assert(sizeof(PFS0Superblock) == 0x200, "PFS0Superblock has incorrect size.");
struct RomFSSuperblock {
NCASectionHeaderBlock header_block;
IVFCHeader ivfc;
INSERT_PADDING_BYTES_NOINIT(0x118);
};
static_assert(sizeof(RomFSSuperblock) == 0x200, "RomFSSuperblock has incorrect size.");
struct BKTRHeader {
u64_le offset;
u64_le size;
u32_le magic;
INSERT_PADDING_BYTES_NOINIT(0x4);
u32_le number_entries;
INSERT_PADDING_BYTES_NOINIT(0x4);
};
static_assert(sizeof(BKTRHeader) == 0x20, "BKTRHeader has incorrect size.");
struct BKTRSuperblock {
NCASectionHeaderBlock header_block;
IVFCHeader ivfc;
INSERT_PADDING_BYTES_NOINIT(0x18);
BKTRHeader relocation;
BKTRHeader subsection;
INSERT_PADDING_BYTES_NOINIT(0xC0);
};
static_assert(sizeof(BKTRSuperblock) == 0x200, "BKTRSuperblock has incorrect size.");
union NCASectionHeader {
NCASectionRaw raw{};
PFS0Superblock pfs0;
RomFSSuperblock romfs;
BKTRSuperblock bktr;
};
static_assert(sizeof(NCASectionHeader) == 0x200, "NCASectionHeader has incorrect size.");
static bool IsValidNCA(const NCAHeader& header) {
// TODO(DarkLordZach): Add NCA2/NCA0 support.
return header.magic == Common::MakeMagic('N', 'C', 'A', '3');
}
NCA::NCA(VirtualFile file_, VirtualFile bktr_base_romfs_, u64 bktr_base_ivfc_offset)
: file(std::move(file_)),
bktr_base_romfs(std::move(bktr_base_romfs_)), keys{Core::Crypto::KeyManager::Instance()} {
if (file == nullptr) {
status = Loader::ResultStatus::ErrorNullFile;
return;
}
if (sizeof(NCAHeader) != file->ReadObject(&header)) {
LOG_ERROR(Loader, "File reader errored out during header read.");
status = Loader::ResultStatus::ErrorBadNCAHeader;
return;
}
if (!HandlePotentialHeaderDecryption()) {
return;
}
has_rights_id = std::ranges::any_of(header.rights_id, [](char c) { return c != '\0'; });
const std::vector<NCASectionHeader> sections = ReadSectionHeaders();
is_update = std::ranges::any_of(sections, [](const NCASectionHeader& nca_header) {
return nca_header.raw.header.crypto_type == NCASectionCryptoType::BKTR;
});
if (!ReadSections(sections, bktr_base_ivfc_offset)) {
return;
}
status = Loader::ResultStatus::Success;
}
NCA::~NCA() = default;
bool NCA::CheckSupportedNCA(const NCAHeader& nca_header) {
if (nca_header.magic == Common::MakeMagic('N', 'C', 'A', '2')) {
status = Loader::ResultStatus::ErrorNCA2;
return false;
}
if (nca_header.magic == Common::MakeMagic('N', 'C', 'A', '0')) {
status = Loader::ResultStatus::ErrorNCA0;
return false;
}
return true;
}
bool NCA::HandlePotentialHeaderDecryption() {
if (IsValidNCA(header)) {
return true;
}
if (!CheckSupportedNCA(header)) {
return false;
}
NCAHeader dec_header{};
Core::Crypto::AESCipher<Core::Crypto::Key256> cipher(
keys.GetKey(Core::Crypto::S256KeyType::Header), Core::Crypto::Mode::XTS);
cipher.XTSTranscode(&header, sizeof(NCAHeader), &dec_header, 0, 0x200,
Core::Crypto::Op::Decrypt);
if (IsValidNCA(dec_header)) {
header = dec_header;
encrypted = true;
} else {
if (!CheckSupportedNCA(dec_header)) {
return false;
}
if (keys.HasKey(Core::Crypto::S256KeyType::Header)) {
status = Loader::ResultStatus::ErrorIncorrectHeaderKey;
} else {
status = Loader::ResultStatus::ErrorMissingHeaderKey;
}
return false;
}
return true;
}
std::vector<NCASectionHeader> NCA::ReadSectionHeaders() const {
const std::ptrdiff_t number_sections =
std::ranges::count_if(header.section_tables, [](const NCASectionTableEntry& entry) {
return entry.media_offset > 0;
});
std::vector<NCASectionHeader> sections(number_sections);
const auto length_sections = SECTION_HEADER_SIZE * number_sections;
if (encrypted) {
auto raw = file->ReadBytes(length_sections, SECTION_HEADER_OFFSET);
Core::Crypto::AESCipher<Core::Crypto::Key256> cipher(
keys.GetKey(Core::Crypto::S256KeyType::Header), Core::Crypto::Mode::XTS);
cipher.XTSTranscode(raw.data(), length_sections, sections.data(), 2, SECTION_HEADER_SIZE,
Core::Crypto::Op::Decrypt);
} else {
file->ReadBytes(sections.data(), length_sections, SECTION_HEADER_OFFSET);
}
return sections;
}
bool NCA::ReadSections(const std::vector<NCASectionHeader>& sections, u64 bktr_base_ivfc_offset) {
for (std::size_t i = 0; i < sections.size(); ++i) {
const auto& section = sections[i];
if (section.raw.header.filesystem_type == NCASectionFilesystemType::ROMFS) {
if (!ReadRomFSSection(section, header.section_tables[i], bktr_base_ivfc_offset)) {
return false;
}
} else if (section.raw.header.filesystem_type == NCASectionFilesystemType::PFS0) {
if (!ReadPFS0Section(section, header.section_tables[i])) {
return false;
}
}
}
return true;
}
bool NCA::ReadRomFSSection(const NCASectionHeader& section, const NCASectionTableEntry& entry,
u64 bktr_base_ivfc_offset) {
const std::size_t base_offset = entry.media_offset * MEDIA_OFFSET_MULTIPLIER;
ivfc_offset = section.romfs.ivfc.levels[IVFC_MAX_LEVEL - 1].offset;
const std::size_t romfs_offset = base_offset + ivfc_offset;
const std::size_t romfs_size = section.romfs.ivfc.levels[IVFC_MAX_LEVEL - 1].size;
auto raw = std::make_shared<OffsetVfsFile>(file, romfs_size, romfs_offset);
auto dec = Decrypt(section, raw, romfs_offset);
if (dec == nullptr) {
if (status != Loader::ResultStatus::Success)
return false;
if (has_rights_id)
status = Loader::ResultStatus::ErrorIncorrectTitlekeyOrTitlekek;
else
status = Loader::ResultStatus::ErrorIncorrectKeyAreaKey;
return false;
}
if (section.raw.header.crypto_type == NCASectionCryptoType::BKTR) {
if (section.bktr.relocation.magic != Common::MakeMagic('B', 'K', 'T', 'R') ||
section.bktr.subsection.magic != Common::MakeMagic('B', 'K', 'T', 'R')) {
status = Loader::ResultStatus::ErrorBadBKTRHeader;
return false;
}
if (section.bktr.relocation.offset + section.bktr.relocation.size !=
section.bktr.subsection.offset) {
status = Loader::ResultStatus::ErrorBKTRSubsectionNotAfterRelocation;
return false;
}
const u64 size = MEDIA_OFFSET_MULTIPLIER * (entry.media_end_offset - entry.media_offset);
if (section.bktr.subsection.offset + section.bktr.subsection.size != size) {
status = Loader::ResultStatus::ErrorBKTRSubsectionNotAtEnd;
return false;
}
const u64 offset = section.romfs.ivfc.levels[IVFC_MAX_LEVEL - 1].offset;
RelocationBlock relocation_block{};
if (dec->ReadObject(&relocation_block, section.bktr.relocation.offset - offset) !=
sizeof(RelocationBlock)) {
status = Loader::ResultStatus::ErrorBadRelocationBlock;
return false;
}
SubsectionBlock subsection_block{};
if (dec->ReadObject(&subsection_block, section.bktr.subsection.offset - offset) !=
sizeof(RelocationBlock)) {
status = Loader::ResultStatus::ErrorBadSubsectionBlock;
return false;
}
std::vector<RelocationBucketRaw> relocation_buckets_raw(
(section.bktr.relocation.size - sizeof(RelocationBlock)) / sizeof(RelocationBucketRaw));
if (dec->ReadBytes(relocation_buckets_raw.data(),
section.bktr.relocation.size - sizeof(RelocationBlock),
section.bktr.relocation.offset + sizeof(RelocationBlock) - offset) !=
section.bktr.relocation.size - sizeof(RelocationBlock)) {
status = Loader::ResultStatus::ErrorBadRelocationBuckets;
return false;
}
std::vector<SubsectionBucketRaw> subsection_buckets_raw(
(section.bktr.subsection.size - sizeof(SubsectionBlock)) / sizeof(SubsectionBucketRaw));
if (dec->ReadBytes(subsection_buckets_raw.data(),
section.bktr.subsection.size - sizeof(SubsectionBlock),
section.bktr.subsection.offset + sizeof(SubsectionBlock) - offset) !=
section.bktr.subsection.size - sizeof(SubsectionBlock)) {
status = Loader::ResultStatus::ErrorBadSubsectionBuckets;
return false;
}
std::vector<RelocationBucket> relocation_buckets(relocation_buckets_raw.size());
std::ranges::transform(relocation_buckets_raw, relocation_buckets.begin(),
&ConvertRelocationBucketRaw);
std::vector<SubsectionBucket> subsection_buckets(subsection_buckets_raw.size());
std::ranges::transform(subsection_buckets_raw, subsection_buckets.begin(),
&ConvertSubsectionBucketRaw);
u32 ctr_low;
std::memcpy(&ctr_low, section.raw.section_ctr.data(), sizeof(ctr_low));
subsection_buckets.back().entries.push_back({section.bktr.relocation.offset, {0}, ctr_low});
subsection_buckets.back().entries.push_back({size, {0}, 0});
std::optional<Core::Crypto::Key128> key;
if (encrypted) {
if (has_rights_id) {
status = Loader::ResultStatus::Success;
key = GetTitlekey();
if (!key) {
status = Loader::ResultStatus::ErrorMissingTitlekey;
return false;
}
} else {
key = GetKeyAreaKey(NCASectionCryptoType::BKTR);
if (!key) {
status = Loader::ResultStatus::ErrorMissingKeyAreaKey;
return false;
}
}
}
if (bktr_base_romfs == nullptr) {
status = Loader::ResultStatus::ErrorMissingBKTRBaseRomFS;
return false;
}
auto bktr = std::make_shared<BKTR>(
bktr_base_romfs, std::make_shared<OffsetVfsFile>(file, romfs_size, base_offset),
relocation_block, relocation_buckets, subsection_block, subsection_buckets, encrypted,
encrypted ? *key : Core::Crypto::Key128{}, base_offset, bktr_base_ivfc_offset,
section.raw.section_ctr);
// BKTR applies to entire IVFC, so make an offset version to level 6
files.push_back(std::make_shared<OffsetVfsFile>(
bktr, romfs_size, section.romfs.ivfc.levels[IVFC_MAX_LEVEL - 1].offset));
} else {
files.push_back(std::move(dec));
}
romfs = files.back();
return true;
}
bool NCA::ReadPFS0Section(const NCASectionHeader& section, const NCASectionTableEntry& entry) {
const u64 offset = (static_cast<u64>(entry.media_offset) * MEDIA_OFFSET_MULTIPLIER) +
section.pfs0.pfs0_header_offset;
const u64 size = MEDIA_OFFSET_MULTIPLIER * (entry.media_end_offset - entry.media_offset);
auto dec = Decrypt(section, std::make_shared<OffsetVfsFile>(file, size, offset), offset);
if (dec != nullptr) {
auto npfs = std::make_shared<PartitionFilesystem>(std::move(dec));
if (npfs->GetStatus() == Loader::ResultStatus::Success) {
dirs.push_back(std::move(npfs));
if (IsDirectoryExeFS(dirs.back()))
exefs = dirs.back();
else if (IsDirectoryLogoPartition(dirs.back()))
logo = dirs.back();
} else {
if (has_rights_id)
status = Loader::ResultStatus::ErrorIncorrectTitlekeyOrTitlekek;
else
status = Loader::ResultStatus::ErrorIncorrectKeyAreaKey;
return false;
}
} else {
if (status != Loader::ResultStatus::Success)
return false;
if (has_rights_id)
status = Loader::ResultStatus::ErrorIncorrectTitlekeyOrTitlekek;
else
status = Loader::ResultStatus::ErrorIncorrectKeyAreaKey;
return false;
}
return true;
}
u8 NCA::GetCryptoRevision() const {
u8 master_key_id = header.crypto_type;
if (header.crypto_type_2 > master_key_id)
master_key_id = header.crypto_type_2;
if (master_key_id > 0)
--master_key_id;
return master_key_id;
}
std::optional<Core::Crypto::Key128> NCA::GetKeyAreaKey(NCASectionCryptoType type) const {
const auto master_key_id = GetCryptoRevision();
if (!keys.HasKey(Core::Crypto::S128KeyType::KeyArea, master_key_id, header.key_index)) {
return std::nullopt;
}
std::vector<u8> key_area(header.key_area.begin(), header.key_area.end());
Core::Crypto::AESCipher<Core::Crypto::Key128> cipher(
keys.GetKey(Core::Crypto::S128KeyType::KeyArea, master_key_id, header.key_index),
Core::Crypto::Mode::ECB);
cipher.Transcode(key_area.data(), key_area.size(), key_area.data(), Core::Crypto::Op::Decrypt);
Core::Crypto::Key128 out;
if (type == NCASectionCryptoType::XTS) {
std::copy(key_area.begin(), key_area.begin() + 0x10, out.begin());
} else if (type == NCASectionCryptoType::CTR || type == NCASectionCryptoType::BKTR) {
std::copy(key_area.begin() + 0x20, key_area.begin() + 0x30, out.begin());
} else {
LOG_CRITICAL(Crypto, "Called GetKeyAreaKey on invalid NCASectionCryptoType type={:02X}",
type);
}
u128 out_128{};
std::memcpy(out_128.data(), out.data(), sizeof(u128));
LOG_TRACE(Crypto, "called with crypto_rev={:02X}, kak_index={:02X}, key={:016X}{:016X}",
master_key_id, header.key_index, out_128[1], out_128[0]);
return out;
}
std::optional<Core::Crypto::Key128> NCA::GetTitlekey() {
const auto master_key_id = GetCryptoRevision();
u128 rights_id{};
memcpy(rights_id.data(), header.rights_id.data(), 16);
if (rights_id == u128{}) {
status = Loader::ResultStatus::ErrorInvalidRightsID;
return std::nullopt;
}
auto titlekey = keys.GetKey(Core::Crypto::S128KeyType::Titlekey, rights_id[1], rights_id[0]);
if (titlekey == Core::Crypto::Key128{}) {
status = Loader::ResultStatus::ErrorMissingTitlekey;
return std::nullopt;
}
if (!keys.HasKey(Core::Crypto::S128KeyType::Titlekek, master_key_id)) {
status = Loader::ResultStatus::ErrorMissingTitlekek;
return std::nullopt;
}
Core::Crypto::AESCipher<Core::Crypto::Key128> cipher(
keys.GetKey(Core::Crypto::S128KeyType::Titlekek, master_key_id), Core::Crypto::Mode::ECB);
cipher.Transcode(titlekey.data(), titlekey.size(), titlekey.data(), Core::Crypto::Op::Decrypt);
return titlekey;
}
VirtualFile NCA::Decrypt(const NCASectionHeader& s_header, VirtualFile in, u64 starting_offset) {
if (!encrypted)
return in;
switch (s_header.raw.header.crypto_type) {
case NCASectionCryptoType::NONE:
LOG_TRACE(Crypto, "called with mode=NONE");
return in;
case NCASectionCryptoType::CTR:
// During normal BKTR decryption, this entire function is skipped. This is for the metadata,
// which uses the same CTR as usual.
case NCASectionCryptoType::BKTR:
LOG_TRACE(Crypto, "called with mode=CTR, starting_offset={:016X}", starting_offset);
{
std::optional<Core::Crypto::Key128> key;
if (has_rights_id) {
status = Loader::ResultStatus::Success;
key = GetTitlekey();
if (!key) {
if (status == Loader::ResultStatus::Success)
status = Loader::ResultStatus::ErrorMissingTitlekey;
return nullptr;
}
} else {
key = GetKeyAreaKey(NCASectionCryptoType::CTR);
if (!key) {
status = Loader::ResultStatus::ErrorMissingKeyAreaKey;
return nullptr;
}
}
auto out = std::make_shared<Core::Crypto::CTREncryptionLayer>(std::move(in), *key,
starting_offset);
Core::Crypto::CTREncryptionLayer::IVData iv{};
for (std::size_t i = 0; i < 8; ++i) {
iv[i] = s_header.raw.section_ctr[8 - i - 1];
}
out->SetIV(iv);
return std::static_pointer_cast<VfsFile>(out);
}
case NCASectionCryptoType::XTS:
// TODO(DarkLordZach): Find a test case for XTS-encrypted NCAs
default:
LOG_ERROR(Crypto, "called with unhandled crypto type={:02X}",
s_header.raw.header.crypto_type);
return nullptr;
}
}
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 header.content_type;
}
u64 NCA::GetTitleId() const {
if (is_update || status == Loader::ResultStatus::ErrorMissingBKTRBaseRomFS)
return header.title_id | 0x800;
return header.title_id;
}
std::array<u8, 16> NCA::GetRightsId() const {
return header.rights_id;
}
u32 NCA::GetSDKVersion() const {
return header.sdk_version;
}
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;
}
u64 NCA::GetBaseIVFCOffset() const {
return ivfc_offset;
}
VirtualDir NCA::GetLogoPartition() const {
return logo;
}
} // namespace FileSys
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