diff options
Diffstat (limited to 'src/core/crypto/key_manager.cpp')
| -rw-r--r-- | src/core/crypto/key_manager.cpp | 172 |
1 files changed, 165 insertions, 7 deletions
diff --git a/src/core/crypto/key_manager.cpp b/src/core/crypto/key_manager.cpp index db8b22c85..0b6c07de8 100644 --- a/src/core/crypto/key_manager.cpp +++ b/src/core/crypto/key_manager.cpp @@ -12,11 +12,112 @@ #include "common/file_util.h" #include "common/hex_util.h" #include "common/logging/log.h" +#include "core/crypto/aes_util.h" #include "core/crypto/key_manager.h" #include "core/settings.h" namespace Core::Crypto { +Key128 GenerateKeyEncryptionKey(Key128 source, Key128 master, Key128 kek_seed, Key128 key_seed) { + Key128 out{}; + + AESCipher<Key128> cipher1(master, Mode::ECB); + cipher1.Transcode(kek_seed.data(), kek_seed.size(), out.data(), Op::Decrypt); + AESCipher<Key128> cipher2(out, Mode::ECB); + cipher2.Transcode(source.data(), source.size(), out.data(), Op::Decrypt); + + if (key_seed != Key128{}) { + AESCipher<Key128> cipher3(out, Mode::ECB); + cipher3.Transcode(key_seed.data(), key_seed.size(), out.data(), Op::Decrypt); + } + + return out; +} + +boost::optional<Key128> DeriveSDSeed() { + const FileUtil::IOFile save_43(FileUtil::GetUserPath(FileUtil::UserPath::NANDDir) + + "/system/save/8000000000000043", + "rb+"); + if (!save_43.IsOpen()) + return boost::none; + const FileUtil::IOFile sd_private( + FileUtil::GetUserPath(FileUtil::UserPath::SDMCDir) + "/Nintendo/Contents/private", "rb+"); + if (!sd_private.IsOpen()) + return boost::none; + + sd_private.Seek(0, SEEK_SET); + std::array<u8, 0x10> private_seed{}; + if (sd_private.ReadBytes(private_seed.data(), private_seed.size()) != 0x10) + return boost::none; + + std::array<u8, 0x10> buffer{}; + size_t offset = 0; + for (; offset + 0x10 < save_43.GetSize(); ++offset) { + save_43.Seek(offset, SEEK_SET); + save_43.ReadBytes(buffer.data(), buffer.size()); + if (buffer == private_seed) + break; + } + + if (offset + 0x10 >= save_43.GetSize()) + return boost::none; + + Key128 seed{}; + save_43.Seek(offset + 0x10, SEEK_SET); + save_43.ReadBytes(seed.data(), seed.size()); + return seed; +} + +Loader::ResultStatus DeriveSDKeys(std::array<Key256, 2>& sd_keys, const KeyManager& keys) { + if (!keys.HasKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::SDKEK))) + return Loader::ResultStatus::ErrorMissingSDKEKSource; + if (!keys.HasKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKEKGeneration))) + return Loader::ResultStatus::ErrorMissingAESKEKGenerationSource; + if (!keys.HasKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKeyGeneration))) + return Loader::ResultStatus::ErrorMissingAESKeyGenerationSource; + + const auto sd_kek_source = + keys.GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::SDKEK)); + const auto aes_kek_gen = + keys.GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKEKGeneration)); + const auto aes_key_gen = + keys.GetKey(S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKeyGeneration)); + const auto master_00 = keys.GetKey(S128KeyType::Master); + const auto sd_kek = + GenerateKeyEncryptionKey(sd_kek_source, master_00, aes_kek_gen, aes_key_gen); + + if (!keys.HasKey(S128KeyType::SDSeed)) + return Loader::ResultStatus::ErrorMissingSDSeed; + const auto sd_seed = keys.GetKey(S128KeyType::SDSeed); + + if (!keys.HasKey(S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::Save))) + return Loader::ResultStatus::ErrorMissingSDSaveKeySource; + if (!keys.HasKey(S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::NCA))) + return Loader::ResultStatus::ErrorMissingSDNCAKeySource; + + std::array<Key256, 2> sd_key_sources{ + keys.GetKey(S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::Save)), + keys.GetKey(S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::NCA)), + }; + + // Combine sources and seed + for (auto& source : sd_key_sources) { + for (size_t i = 0; i < source.size(); ++i) + source[i] ^= sd_seed[i & 0xF]; + } + + AESCipher<Key128> cipher(sd_kek, Mode::ECB); + // The transform manipulates sd_keys as part of the Transcode, so the return/output is + // unnecessary. This does not alter sd_keys_sources. + std::transform(sd_key_sources.begin(), sd_key_sources.end(), sd_keys.begin(), + sd_key_sources.begin(), [&cipher](const Key256& source, Key256& out) { + cipher.Transcode(source.data(), source.size(), out.data(), Op::Decrypt); + return source; ///< Return unaltered source to satisfy output requirement. + }); + + return Loader::ResultStatus::Success; +} + KeyManager::KeyManager() { // Initialize keys const std::string hactool_keys_dir = FileUtil::GetHactoolConfigurationPath(); @@ -24,12 +125,15 @@ KeyManager::KeyManager() { if (Settings::values.use_dev_keys) { dev_mode = true; AttemptLoadKeyFile(yuzu_keys_dir, hactool_keys_dir, "dev.keys", false); + AttemptLoadKeyFile(yuzu_keys_dir, yuzu_keys_dir, "dev.keys_autogenerated", false); } else { dev_mode = false; AttemptLoadKeyFile(yuzu_keys_dir, hactool_keys_dir, "prod.keys", false); + AttemptLoadKeyFile(yuzu_keys_dir, yuzu_keys_dir, "prod.keys_autogenerated", false); } AttemptLoadKeyFile(yuzu_keys_dir, hactool_keys_dir, "title.keys", true); + AttemptLoadKeyFile(yuzu_keys_dir, yuzu_keys_dir, "title.keys_autogenerated", true); } void KeyManager::LoadFromFile(const std::string& filename, bool is_title_keys) { @@ -56,17 +160,17 @@ void KeyManager::LoadFromFile(const std::string& filename, bool is_title_keys) { u128 rights_id{}; std::memcpy(rights_id.data(), rights_id_raw.data(), rights_id_raw.size()); Key128 key = Common::HexStringToArray<16>(out[1]); - SetKey(S128KeyType::Titlekey, key, rights_id[1], rights_id[0]); + s128_keys[{S128KeyType::Titlekey, rights_id[1], rights_id[0]}] = key; } else { std::transform(out[0].begin(), out[0].end(), out[0].begin(), ::tolower); if (s128_file_id.find(out[0]) != s128_file_id.end()) { const auto index = s128_file_id.at(out[0]); Key128 key = Common::HexStringToArray<16>(out[1]); - SetKey(index.type, key, index.field1, index.field2); + s128_keys[{index.type, index.field1, index.field2}] = key; } else if (s256_file_id.find(out[0]) != s256_file_id.end()) { const auto index = s256_file_id.at(out[0]); Key256 key = Common::HexStringToArray<32>(out[1]); - SetKey(index.type, key, index.field1, index.field2); + s256_keys[{index.type, index.field1, index.field2}] = key; } } } @@ -100,11 +204,50 @@ Key256 KeyManager::GetKey(S256KeyType id, u64 field1, u64 field2) const { return s256_keys.at({id, field1, field2}); } +template <size_t Size> +void KeyManager::WriteKeyToFile(bool title_key, std::string_view keyname, + const std::array<u8, Size>& key) { + const std::string yuzu_keys_dir = FileUtil::GetUserPath(FileUtil::UserPath::KeysDir); + std::string filename = "title.keys_autogenerated"; + if (!title_key) + filename = dev_mode ? "dev.keys_autogenerated" : "prod.keys_autogenerated"; + const auto add_info_text = !FileUtil::Exists(yuzu_keys_dir + DIR_SEP + filename); + FileUtil::CreateFullPath(yuzu_keys_dir + DIR_SEP + filename); + std::ofstream file(yuzu_keys_dir + DIR_SEP + filename, std::ios::app); + if (!file.is_open()) + return; + if (add_info_text) { + file + << "# This file is autogenerated by Yuzu\n" + << "# It serves to store keys that were automatically generated from the normal keys\n" + << "# If you are experiencing issues involving keys, it may help to delete this file\n"; + } + + file << fmt::format("\n{} = {}", keyname, Common::HexArrayToString(key)); + AttemptLoadKeyFile(yuzu_keys_dir, yuzu_keys_dir, filename, title_key); +} + void KeyManager::SetKey(S128KeyType id, Key128 key, u64 field1, u64 field2) { + const auto iter = std::find_if( + s128_file_id.begin(), s128_file_id.end(), + [&id, &field1, &field2](const std::pair<std::string, KeyIndex<S128KeyType>> elem) { + return std::tie(elem.second.type, elem.second.field1, elem.second.field2) == + std::tie(id, field1, field2); + }); + if (iter != s128_file_id.end()) + WriteKeyToFile(id == S128KeyType::Titlekey, iter->first, key); s128_keys[{id, field1, field2}] = key; } void KeyManager::SetKey(S256KeyType id, Key256 key, u64 field1, u64 field2) { + const auto iter = std::find_if( + s256_file_id.begin(), s256_file_id.end(), + [&id, &field1, &field2](const std::pair<std::string, KeyIndex<S256KeyType>> elem) { + return std::tie(elem.second.type, elem.second.field1, elem.second.field2) == + std::tie(id, field1, field2); + }); + if (iter != s256_file_id.end()) + WriteKeyToFile(false, iter->first, key); s256_keys[{id, field1, field2}] = key; } @@ -125,7 +268,16 @@ bool KeyManager::KeyFileExists(bool title) { FileUtil::Exists(yuzu_keys_dir + DIR_SEP + "prod.keys"); } -const std::unordered_map<std::string, KeyIndex<S128KeyType>> KeyManager::s128_file_id = { +void KeyManager::DeriveSDSeedLazy() { + if (HasKey(S128KeyType::SDSeed)) + return; + + const auto res = DeriveSDSeed(); + if (res != boost::none) + SetKey(S128KeyType::SDSeed, res.get()); +} + +const boost::container::flat_map<std::string, KeyIndex<S128KeyType>> KeyManager::s128_file_id = { {"master_key_00", {S128KeyType::Master, 0, 0}}, {"master_key_01", {S128KeyType::Master, 1, 0}}, {"master_key_02", {S128KeyType::Master, 2, 0}}, @@ -167,11 +319,17 @@ const std::unordered_map<std::string, KeyIndex<S128KeyType>> KeyManager::s128_fi {"key_area_key_system_02", {S128KeyType::KeyArea, 2, static_cast<u64>(KeyAreaKeyType::System)}}, {"key_area_key_system_03", {S128KeyType::KeyArea, 3, static_cast<u64>(KeyAreaKeyType::System)}}, {"key_area_key_system_04", {S128KeyType::KeyArea, 4, static_cast<u64>(KeyAreaKeyType::System)}}, + {"sd_card_kek_source", {S128KeyType::Source, static_cast<u64>(SourceKeyType::SDKEK), 0}}, + {"aes_kek_generation_source", + {S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKEKGeneration), 0}}, + {"aes_key_generation_source", + {S128KeyType::Source, static_cast<u64>(SourceKeyType::AESKeyGeneration), 0}}, + {"sd_seed", {S128KeyType::SDSeed, 0, 0}}, }; -const std::unordered_map<std::string, KeyIndex<S256KeyType>> KeyManager::s256_file_id = { +const boost::container::flat_map<std::string, KeyIndex<S256KeyType>> KeyManager::s256_file_id = { {"header_key", {S256KeyType::Header, 0, 0}}, - {"sd_card_save_key", {S256KeyType::SDSave, 0, 0}}, - {"sd_card_nca_key", {S256KeyType::SDNCA, 0, 0}}, + {"sd_card_save_key_source", {S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::Save), 0}}, + {"sd_card_nca_key_source", {S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::NCA), 0}}, }; } // namespace Core::Crypto |