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Atmosphere/libraries/libstratosphere/source/fssystem/fssystem_nca_reader.cpp

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/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stratosphere.hpp>
namespace ams::fssystem {
namespace {
constexpr inline u32 SdkAddonVersionMin = 0x000B0000;
constexpr Result CheckNcaMagic(u32 magic) {
/* Verify the magic is not a deprecated one. */
R_UNLESS(magic != NcaHeader::Magic0, fs::ResultUnsupportedSdkVersion());
R_UNLESS(magic != NcaHeader::Magic1, fs::ResultUnsupportedSdkVersion());
R_UNLESS(magic != NcaHeader::Magic2, fs::ResultUnsupportedSdkVersion());
/* Verify the magic is the current one. */
R_UNLESS(magic == NcaHeader::Magic3, fs::ResultInvalidNcaSignature());
return ResultSuccess();
}
}
NcaReader::NcaReader() : m_body_storage(), m_header_storage(), m_decrypt_aes_ctr(), m_decrypt_aes_ctr_external(), m_is_software_aes_prioritized(false), m_header_encryption_type(NcaHeader::EncryptionType::Auto), m_get_decompressor(), m_hash_generator_factory() {
std::memset(std::addressof(m_header), 0, sizeof(m_header));
std::memset(std::addressof(m_decryption_keys), 0, sizeof(m_decryption_keys));
std::memset(std::addressof(m_external_decryption_key), 0, sizeof(m_external_decryption_key));
}
NcaReader::~NcaReader() {
/* ... */
}
Result NcaReader::Initialize(std::shared_ptr<fs::IStorage> base_storage, const NcaCryptoConfiguration &crypto_cfg, const NcaCompressionConfiguration &compression_cfg, IHash256GeneratorFactorySelector *hgf_selector) {
/* Validate preconditions. */
AMS_ASSERT(base_storage != nullptr);
AMS_ASSERT(hgf_selector != nullptr);
AMS_ASSERT(m_body_storage == nullptr);
/* Check that the crypto config is valid. */
R_UNLESS(crypto_cfg.generate_key != nullptr, fs::ResultInvalidArgument());
/* Generate keys for header. */
using AesXtsStorageForNcaHeader = AesXtsStorageBySharedPointer;
u8 header_decryption_keys[NcaCryptoConfiguration::HeaderEncryptionKeyCount][NcaCryptoConfiguration::Aes128KeySize];
for (size_t i = 0; i < NcaCryptoConfiguration::HeaderEncryptionKeyCount; i++) {
crypto_cfg.generate_key(header_decryption_keys[i], AesXtsStorageForNcaHeader::KeySize, crypto_cfg.header_encrypted_encryption_keys[i], AesXtsStorageForNcaHeader::KeySize, static_cast<s32>(KeyType::NcaHeaderKey), crypto_cfg);
}
/* Create the header storage. */
const u8 header_iv[AesXtsStorageForNcaHeader::IvSize] = {};
std::unique_ptr<fs::IStorage> work_header_storage = std::make_unique<AesXtsStorageForNcaHeader>(base_storage, header_decryption_keys[0], header_decryption_keys[1], AesXtsStorageForNcaHeader::KeySize, header_iv, AesXtsStorageForNcaHeader::IvSize, NcaHeader::XtsBlockSize);
R_UNLESS(work_header_storage != nullptr, fs::ResultAllocationFailureInNcaReaderA());
/* Read the header. */
R_TRY(work_header_storage->Read(0, std::addressof(m_header), sizeof(m_header)));
/* Validate the magic. */
if (const Result magic_result = CheckNcaMagic(m_header.magic); R_FAILED(magic_result)) {
/* If we're not allowed to use plaintext headers, stop here. */
R_UNLESS(crypto_cfg.is_plaintext_header_available, magic_result);
/* Try to use a plaintext header. */
R_TRY(base_storage->Read(0, std::addressof(m_header), sizeof(m_header)));
R_UNLESS(R_SUCCEEDED(CheckNcaMagic(m_header.magic)), magic_result);
/* Configure to use the plaintext header. */
s64 base_storage_size;
R_TRY(base_storage->GetSize(std::addressof(base_storage_size)));
work_header_storage.reset(new fs::SubStorage(base_storage, 0, base_storage_size));
R_UNLESS(work_header_storage != nullptr, fs::ResultAllocationFailureInNcaReaderA());
/* Set encryption type as plaintext. */
m_header_encryption_type = NcaHeader::EncryptionType::None;
}
/* Validate the fixed key signature. */
R_UNLESS(m_header.header1_signature_key_generation <= NcaCryptoConfiguration::Header1SignatureKeyGenerationMax, fs::ResultInvalidNcaHeader1SignatureKeyGeneration());
const u8 *header_1_sign_key_modulus = crypto_cfg.header_1_sign_key_moduli[m_header.header1_signature_key_generation];
AMS_ABORT_UNLESS(header_1_sign_key_modulus != nullptr);
{
const u8 *sig = m_header.header_sign_1;
const size_t sig_size = NcaHeader::HeaderSignSize;
const u8 *mod = header_1_sign_key_modulus;
const size_t mod_size = NcaCryptoConfiguration::Rsa2048KeyModulusSize;
const u8 *exp = crypto_cfg.header_1_sign_key_public_exponent;
const size_t exp_size = NcaCryptoConfiguration::Rsa2048KeyPublicExponentSize;
const u8 *msg = static_cast<const u8 *>(static_cast<const void *>(std::addressof(m_header.magic)));
const size_t msg_size = NcaHeader::Size - NcaHeader::HeaderSignSize * NcaHeader::HeaderSignCount;
const bool is_signature_valid = crypto::VerifyRsa2048PssSha256(sig, sig_size, mod, mod_size, exp, exp_size, msg, msg_size);
R_UNLESS(is_signature_valid, fs::ResultNcaHeaderSignature1VerificationFailed());
}
/* Validate the sdk version. */
R_UNLESS(m_header.sdk_addon_version >= SdkAddonVersionMin, fs::ResultUnsupportedSdkVersion());
/* Validate the key index. */
R_UNLESS(m_header.key_index < NcaCryptoConfiguration::KeyAreaEncryptionKeyIndexCount, fs::ResultInvalidNcaKeyIndex());
/* Check if we have a rights id. */
constexpr const u8 ZeroRightsId[NcaHeader::RightsIdSize] = {};
if (crypto::IsSameBytes(ZeroRightsId, m_header.rights_id, NcaHeader::RightsIdSize)) {
/* If we do, then we don't have an external key, so we need to generate decryption keys. */
crypto_cfg.generate_key(m_decryption_keys[NcaHeader::DecryptionKey_AesCtr], crypto::AesDecryptor128::KeySize, m_header.encrypted_key_area + NcaHeader::DecryptionKey_AesCtr * crypto::AesDecryptor128::KeySize, crypto::AesDecryptor128::KeySize, GetKeyTypeValue(m_header.key_index, m_header.GetProperKeyGeneration()), crypto_cfg);
/* Copy the hardware speed emulation key. */
std::memcpy(m_decryption_keys[NcaHeader::DecryptionKey_AesCtrHw], m_header.encrypted_key_area + NcaHeader::DecryptionKey_AesCtrHw * crypto::AesDecryptor128::KeySize, crypto::AesDecryptor128::KeySize);
}
/* Clear the external decryption key. */
std::memset(m_external_decryption_key, 0, sizeof(m_external_decryption_key));
/* Set our decryptor functions. */
m_decrypt_aes_ctr = crypto_cfg.decrypt_aes_ctr;
m_decrypt_aes_ctr_external = crypto_cfg.decrypt_aes_ctr_external;
/* Set our decompressor function getter. */
m_get_decompressor = compression_cfg.get_decompressor;
/* Set our hash generator factory. */
m_hash_generator_factory = hgf_selector->GetFactory();
AMS_ASSERT(m_hash_generator_factory != nullptr);
/* Set our storages. */
m_header_storage = std::move(work_header_storage);
m_body_storage = std::move(base_storage);
return ResultSuccess();
}
std::shared_ptr<fs::IStorage> NcaReader::GetSharedBodyStorage() {
AMS_ASSERT(m_body_storage != nullptr);
return m_body_storage;
}
u32 NcaReader::GetMagic() const {
AMS_ASSERT(m_body_storage != nullptr);
return m_header.magic;
}
NcaHeader::DistributionType NcaReader::GetDistributionType() const {
AMS_ASSERT(m_body_storage != nullptr);
return m_header.distribution_type;
}
NcaHeader::ContentType NcaReader::GetContentType() const {
AMS_ASSERT(m_body_storage != nullptr);
return m_header.content_type;
}
u8 NcaReader::GetKeyGeneration() const {
AMS_ASSERT(m_body_storage != nullptr);
return m_header.GetProperKeyGeneration();
}
u8 NcaReader::GetKeyIndex() const {
AMS_ASSERT(m_body_storage != nullptr);
return m_header.key_index;
}
u64 NcaReader::GetContentSize() const {
AMS_ASSERT(m_body_storage != nullptr);
return m_header.content_size;
}
u64 NcaReader::GetProgramId() const {
AMS_ASSERT(m_body_storage != nullptr);
return m_header.program_id;
}
u32 NcaReader::GetContentIndex() const {
AMS_ASSERT(m_body_storage != nullptr);
return m_header.content_index;
}
u32 NcaReader::GetSdkAddonVersion() const {
AMS_ASSERT(m_body_storage != nullptr);
return m_header.sdk_addon_version;
}
void NcaReader::GetRightsId(u8 *dst, size_t dst_size) const {
AMS_ASSERT(dst != nullptr);
AMS_ASSERT(dst_size >= NcaHeader::RightsIdSize);
AMS_UNUSED(dst_size);
std::memcpy(dst, m_header.rights_id, NcaHeader::RightsIdSize);
}
bool NcaReader::HasFsInfo(s32 index) const {
AMS_ASSERT(0 <= index && index < NcaHeader::FsCountMax);
return m_header.fs_info[index].start_sector != 0 || m_header.fs_info[index].end_sector != 0;
}
s32 NcaReader::GetFsCount() const {
AMS_ASSERT(m_body_storage != nullptr);
for (s32 i = 0; i < NcaHeader::FsCountMax; i++) {
if (!this->HasFsInfo(i)) {
return i;
}
}
return NcaHeader::FsCountMax;
}
const Hash &NcaReader::GetFsHeaderHash(s32 index) const {
AMS_ASSERT(m_body_storage != nullptr);
AMS_ASSERT(0 <= index && index < NcaHeader::FsCountMax);
return m_header.fs_header_hash[index];
}
void NcaReader::GetFsHeaderHash(Hash *dst, s32 index) const {
AMS_ASSERT(m_body_storage != nullptr);
AMS_ASSERT(0 <= index && index < NcaHeader::FsCountMax);
AMS_ASSERT(dst != nullptr);
std::memcpy(dst, std::addressof(m_header.fs_header_hash[index]), sizeof(*dst));
}
void NcaReader::GetFsInfo(NcaHeader::FsInfo *dst, s32 index) const {
AMS_ASSERT(m_body_storage != nullptr);
AMS_ASSERT(0 <= index && index < NcaHeader::FsCountMax);
AMS_ASSERT(dst != nullptr);
std::memcpy(dst, std::addressof(m_header.fs_info[index]), sizeof(*dst));
}
u64 NcaReader::GetFsOffset(s32 index) const {
AMS_ASSERT(m_body_storage != nullptr);
AMS_ASSERT(0 <= index && index < NcaHeader::FsCountMax);
return NcaHeader::SectorToByte(m_header.fs_info[index].start_sector);
}
u64 NcaReader::GetFsEndOffset(s32 index) const {
AMS_ASSERT(m_body_storage != nullptr);
AMS_ASSERT(0 <= index && index < NcaHeader::FsCountMax);
return NcaHeader::SectorToByte(m_header.fs_info[index].end_sector);
}
u64 NcaReader::GetFsSize(s32 index) const {
AMS_ASSERT(m_body_storage != nullptr);
AMS_ASSERT(0 <= index && index < NcaHeader::FsCountMax);
return NcaHeader::SectorToByte(m_header.fs_info[index].end_sector - m_header.fs_info[index].start_sector);
}
void NcaReader::GetEncryptedKey(void *dst, size_t size) const {
AMS_ASSERT(m_body_storage != nullptr);
AMS_ASSERT(dst != nullptr);
AMS_ASSERT(size >= NcaHeader::EncryptedKeyAreaSize);
AMS_UNUSED(size);
std::memcpy(dst, m_header.encrypted_key_area, NcaHeader::EncryptedKeyAreaSize);
}
const void *NcaReader::GetDecryptionKey(s32 index) const {
AMS_ASSERT(m_body_storage != nullptr);
AMS_ASSERT(0 <= index && index < NcaHeader::DecryptionKey_Count);
return m_decryption_keys[index];
}
bool NcaReader::HasValidInternalKey() const {
constexpr const u8 ZeroKey[crypto::AesDecryptor128::KeySize] = {};
for (s32 i = 0; i < NcaHeader::DecryptionKey_Count; i++) {
if (!crypto::IsSameBytes(ZeroKey, m_header.encrypted_key_area + i * crypto::AesDecryptor128::KeySize, crypto::AesDecryptor128::KeySize)) {
return true;
}
}
return false;
}
bool NcaReader::HasInternalDecryptionKeyForAesHw() const {
constexpr const u8 ZeroKey[crypto::AesDecryptor128::KeySize] = {};
return !crypto::IsSameBytes(ZeroKey, this->GetDecryptionKey(NcaHeader::DecryptionKey_AesCtrHw), crypto::AesDecryptor128::KeySize);
}
bool NcaReader::IsSoftwareAesPrioritized() const {
return m_is_software_aes_prioritized;
}
void NcaReader::PrioritizeSoftwareAes() {
m_is_software_aes_prioritized = true;
}
bool NcaReader::HasExternalDecryptionKey() const {
constexpr const u8 ZeroKey[crypto::AesDecryptor128::KeySize] = {};
return !crypto::IsSameBytes(ZeroKey, this->GetExternalDecryptionKey(), crypto::AesDecryptor128::KeySize);
}
const void *NcaReader::GetExternalDecryptionKey() const {
return m_external_decryption_key;
}
void NcaReader::SetExternalDecryptionKey(const void *src, size_t size) {
AMS_ASSERT(src != nullptr);
AMS_ASSERT(size == sizeof(m_external_decryption_key));
AMS_UNUSED(size);
std::memcpy(m_external_decryption_key, src, sizeof(m_external_decryption_key));
}
void NcaReader::GetRawData(void *dst, size_t dst_size) const {
AMS_ASSERT(m_body_storage != nullptr);
AMS_ASSERT(dst != nullptr);
AMS_ASSERT(dst_size >= sizeof(NcaHeader));
AMS_UNUSED(dst_size);
std::memcpy(dst, std::addressof(m_header), sizeof(NcaHeader));
}
DecryptAesCtrFunction NcaReader::GetExternalDecryptAesCtrFunction() const {
AMS_ASSERT(m_decrypt_aes_ctr != nullptr);
return m_decrypt_aes_ctr;
}
DecryptAesCtrFunction NcaReader::GetExternalDecryptAesCtrFunctionForExternalKey() const {
AMS_ASSERT(m_decrypt_aes_ctr_external != nullptr);
return m_decrypt_aes_ctr_external;
}
GetDecompressorFunction NcaReader::GetDecompressor() const {
AMS_ASSERT(m_get_decompressor != nullptr);
return m_get_decompressor;
}
IHash256GeneratorFactory *NcaReader::GetHashGeneratorFactory() const {
AMS_ASSERT(m_hash_generator_factory != nullptr);
return m_hash_generator_factory;
}
NcaHeader::EncryptionType NcaReader::GetEncryptionType() const {
return m_header_encryption_type;
}
Result NcaReader::ReadHeader(NcaFsHeader *dst, s32 index) const {
AMS_ASSERT(dst != nullptr);
AMS_ASSERT(0 <= index && index < NcaHeader::FsCountMax);
const s64 offset = sizeof(NcaHeader) + sizeof(NcaFsHeader) * index;
return m_header_storage->Read(offset, dst, sizeof(NcaFsHeader));
}
void NcaReader::GetHeaderSign2(void *dst, size_t size) {
AMS_ASSERT(dst != nullptr);
AMS_ASSERT(size == NcaHeader::HeaderSignSize);
std::memcpy(dst, m_header.header_sign_2, size);
}
void NcaReader::GetHeaderSign2TargetHash(void *dst, size_t size) {
AMS_ASSERT(m_hash_generator_factory != nullptr);
AMS_ASSERT(dst != nullptr);
AMS_ASSERT(size == IHash256Generator::HashSize);
return m_hash_generator_factory->GenerateHash(dst, size, static_cast<const void *>(std::addressof(m_header.magic)), NcaHeader::Size - NcaHeader::HeaderSignSize * NcaHeader::HeaderSignCount);
}
Result NcaFsHeaderReader::Initialize(const NcaReader &reader, s32 index) {
/* Reset ourselves to uninitialized. */
m_fs_index = -1;
/* Read the header. */
R_TRY(reader.ReadHeader(std::addressof(m_data), index));
/* Generate the hash. */
Hash hash;
crypto::GenerateSha256(std::addressof(hash), sizeof(hash), std::addressof(m_data), sizeof(NcaFsHeader));
/* Validate the hash. */
R_UNLESS(crypto::IsSameBytes(std::addressof(reader.GetFsHeaderHash(index)), std::addressof(hash), sizeof(Hash)), fs::ResultNcaFsHeaderHashVerificationFailed());
/* Set our index. */
m_fs_index = index;
return ResultSuccess();
}
void NcaFsHeaderReader::GetRawData(void *dst, size_t dst_size) const {
AMS_ASSERT(this->IsInitialized());
AMS_ASSERT(dst != nullptr);
AMS_ASSERT(dst_size >= sizeof(NcaFsHeader));
AMS_UNUSED(dst_size);
std::memcpy(dst, std::addressof(m_data), sizeof(NcaFsHeader));
}
NcaFsHeader::HashData &NcaFsHeaderReader::GetHashData() {
AMS_ASSERT(this->IsInitialized());
return m_data.hash_data;
}
const NcaFsHeader::HashData &NcaFsHeaderReader::GetHashData() const {
AMS_ASSERT(this->IsInitialized());
return m_data.hash_data;
}
u16 NcaFsHeaderReader::GetVersion() const {
AMS_ASSERT(this->IsInitialized());
return m_data.version;
}
s32 NcaFsHeaderReader::GetFsIndex() const {
AMS_ASSERT(this->IsInitialized());
return m_fs_index;
}
NcaFsHeader::FsType NcaFsHeaderReader::GetFsType() const {
AMS_ASSERT(this->IsInitialized());
return m_data.fs_type;
}
NcaFsHeader::HashType NcaFsHeaderReader::GetHashType() const {
AMS_ASSERT(this->IsInitialized());
return m_data.hash_type;
}
NcaFsHeader::EncryptionType NcaFsHeaderReader::GetEncryptionType() const {
AMS_ASSERT(this->IsInitialized());
return m_data.encryption_type;
}
NcaPatchInfo &NcaFsHeaderReader::GetPatchInfo() {
AMS_ASSERT(this->IsInitialized());
return m_data.patch_info;
}
const NcaPatchInfo &NcaFsHeaderReader::GetPatchInfo() const {
AMS_ASSERT(this->IsInitialized());
return m_data.patch_info;
}
const NcaAesCtrUpperIv NcaFsHeaderReader::GetAesCtrUpperIv() const {
AMS_ASSERT(this->IsInitialized());
return m_data.aes_ctr_upper_iv;
}
bool NcaFsHeaderReader::ExistsSparseLayer() const {
AMS_ASSERT(this->IsInitialized());
return m_data.sparse_info.generation != 0;
}
NcaSparseInfo &NcaFsHeaderReader::GetSparseInfo() {
AMS_ASSERT(this->IsInitialized());
return m_data.sparse_info;
}
const NcaSparseInfo &NcaFsHeaderReader::GetSparseInfo() const {
AMS_ASSERT(this->IsInitialized());
return m_data.sparse_info;
}
bool NcaFsHeaderReader::ExistsCompressionLayer() const {
AMS_ASSERT(this->IsInitialized());
return m_data.compression_info.bucket.offset != 0 && m_data.compression_info.bucket.size != 0;
}
NcaCompressionInfo &NcaFsHeaderReader::GetCompressionInfo() {
AMS_ASSERT(this->IsInitialized());
return m_data.compression_info;
}
const NcaCompressionInfo &NcaFsHeaderReader::GetCompressionInfo() const {
AMS_ASSERT(this->IsInitialized());
return m_data.compression_info;
}
}
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