diff options
Diffstat (limited to '')
-rw-r--r-- | src/core/crypto/key_manager.cpp | 234 |
1 files changed, 141 insertions, 93 deletions
diff --git a/src/core/crypto/key_manager.cpp b/src/core/crypto/key_manager.cpp index 4ff2c50e5..43a3c5ffd 100644 --- a/src/core/crypto/key_manager.cpp +++ b/src/core/crypto/key_manager.cpp @@ -35,7 +35,6 @@ namespace Core::Crypto { namespace { constexpr u64 CURRENT_CRYPTO_REVISION = 0x5; -constexpr u64 FULL_TICKET_SIZE = 0x400; using Common::AsArray; @@ -156,6 +155,10 @@ u64 GetSignatureTypePaddingSize(SignatureType type) { UNREACHABLE(); } +bool Ticket::IsValid() const { + return !std::holds_alternative<std::monostate>(data); +} + SignatureType Ticket::GetSignatureType() const { if (const auto* ticket = std::get_if<RSA4096Ticket>(&data)) { return ticket->sig_type; @@ -210,6 +213,54 @@ Ticket Ticket::SynthesizeCommon(Key128 title_key, const std::array<u8, 16>& righ return Ticket{out}; } +Ticket Ticket::Read(const FileSys::VirtualFile& file) { + // Attempt to read up to the largest ticket size, and make sure we read at least a signature + // type. + std::array<u8, sizeof(RSA4096Ticket)> raw_data{}; + auto read_size = file->Read(raw_data.data(), raw_data.size(), 0); + if (read_size < sizeof(SignatureType)) { + LOG_WARNING(Crypto, "Attempted to read ticket file with invalid size {}.", read_size); + return Ticket{std::monostate()}; + } + return Read(std::span{raw_data}); +} + +Ticket Ticket::Read(std::span<const u8> raw_data) { + // Some tools read only 0x180 bytes of ticket data instead of 0x2C0, so + // just make sure we have at least the bare minimum of data to work with. + SignatureType sig_type; + if (raw_data.size() < sizeof(SignatureType)) { + LOG_WARNING(Crypto, "Attempted to parse ticket buffer with invalid size {}.", + raw_data.size()); + return Ticket{std::monostate()}; + } + std::memcpy(&sig_type, raw_data.data(), sizeof(sig_type)); + + switch (sig_type) { + case SignatureType::RSA_4096_SHA1: + case SignatureType::RSA_4096_SHA256: { + RSA4096Ticket ticket{}; + std::memcpy(&ticket, raw_data.data(), sizeof(ticket)); + return Ticket{ticket}; + } + case SignatureType::RSA_2048_SHA1: + case SignatureType::RSA_2048_SHA256: { + RSA2048Ticket ticket{}; + std::memcpy(&ticket, raw_data.data(), sizeof(ticket)); + return Ticket{ticket}; + } + case SignatureType::ECDSA_SHA1: + case SignatureType::ECDSA_SHA256: { + ECDSATicket ticket{}; + std::memcpy(&ticket, raw_data.data(), sizeof(ticket)); + return Ticket{ticket}; + } + default: + LOG_WARNING(Crypto, "Attempted to parse ticket buffer with invalid type {}.", sig_type); + return Ticket{std::monostate()}; + } +} + Key128 GenerateKeyEncryptionKey(Key128 source, Key128 master, Key128 kek_seed, Key128 key_seed) { Key128 out{}; @@ -290,9 +341,9 @@ void KeyManager::DeriveGeneralPurposeKeys(std::size_t crypto_revision) { } } -RSAKeyPair<2048> KeyManager::GetETicketRSAKey() const { +void KeyManager::DeriveETicketRSAKey() { if (IsAllZeroArray(eticket_extended_kek) || !HasKey(S128KeyType::ETicketRSAKek)) { - return {}; + return; } const auto eticket_final = GetKey(S128KeyType::ETicketRSAKek); @@ -304,12 +355,12 @@ RSAKeyPair<2048> KeyManager::GetETicketRSAKey() const { rsa_1.Transcode(eticket_extended_kek.data() + 0x10, eticket_extended_kek.size() - 0x10, extended_dec.data(), Op::Decrypt); - RSAKeyPair<2048> rsa_key{}; - std::memcpy(rsa_key.decryption_key.data(), extended_dec.data(), rsa_key.decryption_key.size()); - std::memcpy(rsa_key.modulus.data(), extended_dec.data() + 0x100, rsa_key.modulus.size()); - std::memcpy(rsa_key.exponent.data(), extended_dec.data() + 0x200, rsa_key.exponent.size()); - - return rsa_key; + std::memcpy(eticket_rsa_keypair.decryption_key.data(), extended_dec.data(), + eticket_rsa_keypair.decryption_key.size()); + std::memcpy(eticket_rsa_keypair.modulus.data(), extended_dec.data() + 0x100, + eticket_rsa_keypair.modulus.size()); + std::memcpy(eticket_rsa_keypair.exponent.data(), extended_dec.data() + 0x200, + eticket_rsa_keypair.exponent.size()); } Key128 DeriveKeyblobMACKey(const Key128& keyblob_key, const Key128& mac_source) { @@ -447,10 +498,12 @@ std::vector<Ticket> GetTicketblob(const Common::FS::IOFile& ticket_save) { for (std::size_t offset = 0; offset + 0x4 < buffer.size(); ++offset) { if (buffer[offset] == 0x4 && buffer[offset + 1] == 0x0 && buffer[offset + 2] == 0x1 && buffer[offset + 3] == 0x0) { - out.emplace_back(); - auto& next = out.back(); - std::memcpy(&next, buffer.data() + offset, sizeof(Ticket)); - offset += FULL_TICKET_SIZE; + // NOTE: Assumes ticket blob will only contain RSA-2048 tickets. + auto ticket = Ticket::Read(std::span{buffer.data() + offset, sizeof(RSA2048Ticket)}); + offset += sizeof(RSA2048Ticket); + if (ticket.IsValid()) { + out.push_back(ticket); + } } } @@ -503,25 +556,36 @@ static std::optional<u64> FindTicketOffset(const std::array<u8, size>& data) { return offset; } -std::optional<std::pair<Key128, Key128>> ParseTicket(const Ticket& ticket, - const RSAKeyPair<2048>& key) { +std::optional<Key128> KeyManager::ParseTicketTitleKey(const Ticket& ticket) { + if (!ticket.IsValid()) { + LOG_WARNING(Crypto, "Attempted to parse title key of invalid ticket."); + return std::nullopt; + } + + if (ticket.GetData().rights_id == Key128{}) { + LOG_WARNING(Crypto, "Attempted to parse title key of ticket with no rights ID."); + return std::nullopt; + } + const auto issuer = ticket.GetData().issuer; if (IsAllZeroArray(issuer)) { + LOG_WARNING(Crypto, "Attempted to parse title key of ticket with invalid issuer."); return std::nullopt; } + if (issuer[0] != 'R' || issuer[1] != 'o' || issuer[2] != 'o' || issuer[3] != 't') { - LOG_INFO(Crypto, "Attempting to parse ticket with non-standard certificate authority."); + LOG_WARNING(Crypto, "Parsing ticket with non-standard certificate authority."); } - Key128 rights_id = ticket.GetData().rights_id; - - if (rights_id == Key128{}) { - return std::nullopt; + if (ticket.GetData().type == TitleKeyType::Common) { + return ticket.GetData().title_key_common; } - if (!std::any_of(ticket.GetData().title_key_common_pad.begin(), - ticket.GetData().title_key_common_pad.end(), [](u8 b) { return b != 0; })) { - return std::make_pair(rights_id, ticket.GetData().title_key_common); + if (eticket_rsa_keypair == RSAKeyPair<2048>{}) { + LOG_WARNING( + Crypto, + "Skipping personalized ticket title key parsing due to missing ETicket RSA key-pair."); + return std::nullopt; } mbedtls_mpi D; // RSA Private Exponent @@ -534,9 +598,12 @@ std::optional<std::pair<Key128, Key128>> ParseTicket(const Ticket& ticket, mbedtls_mpi_init(&S); mbedtls_mpi_init(&M); - mbedtls_mpi_read_binary(&D, key.decryption_key.data(), key.decryption_key.size()); - mbedtls_mpi_read_binary(&N, key.modulus.data(), key.modulus.size()); - mbedtls_mpi_read_binary(&S, ticket.GetData().title_key_block.data(), 0x100); + const auto& title_key_block = ticket.GetData().title_key_block; + mbedtls_mpi_read_binary(&D, eticket_rsa_keypair.decryption_key.data(), + eticket_rsa_keypair.decryption_key.size()); + mbedtls_mpi_read_binary(&N, eticket_rsa_keypair.modulus.data(), + eticket_rsa_keypair.modulus.size()); + mbedtls_mpi_read_binary(&S, title_key_block.data(), title_key_block.size()); mbedtls_mpi_exp_mod(&M, &S, &D, &N, nullptr); @@ -564,8 +631,7 @@ std::optional<std::pair<Key128, Key128>> ParseTicket(const Ticket& ticket, Key128 key_temp{}; std::memcpy(key_temp.data(), m_2.data() + *offset, key_temp.size()); - - return std::make_pair(rights_id, key_temp); + return key_temp; } KeyManager::KeyManager() { @@ -658,17 +724,25 @@ void KeyManager::LoadFromFile(const std::filesystem::path& file_path, bool is_ti continue; } - const auto index = std::stoul(out[0].substr(8, 2), nullptr, 16); + const auto index = std::strtoul(out[0].substr(8, 2).c_str(), nullptr, 16); keyblobs[index] = Common::HexStringToArray<0x90>(out[1]); } else if (out[0].compare(0, 18, "encrypted_keyblob_") == 0) { if (!ValidCryptoRevisionString(out[0], 18, 2)) { continue; } - const auto index = std::stoul(out[0].substr(18, 2), nullptr, 16); + const auto index = std::strtoul(out[0].substr(18, 2).c_str(), nullptr, 16); encrypted_keyblobs[index] = Common::HexStringToArray<0xB0>(out[1]); } else if (out[0].compare(0, 20, "eticket_extended_kek") == 0) { eticket_extended_kek = Common::HexStringToArray<576>(out[1]); + } else if (out[0].compare(0, 19, "eticket_rsa_keypair") == 0) { + const auto key_data = Common::HexStringToArray<528>(out[1]); + std::memcpy(eticket_rsa_keypair.decryption_key.data(), key_data.data(), + eticket_rsa_keypair.decryption_key.size()); + std::memcpy(eticket_rsa_keypair.modulus.data(), key_data.data() + 0x100, + eticket_rsa_keypair.modulus.size()); + std::memcpy(eticket_rsa_keypair.exponent.data(), key_data.data() + 0x200, + eticket_rsa_keypair.exponent.size()); } else { for (const auto& kv : KEYS_VARIABLE_LENGTH) { if (!ValidCryptoRevisionString(out[0], kv.second.size(), 2)) { @@ -676,7 +750,7 @@ void KeyManager::LoadFromFile(const std::filesystem::path& file_path, bool is_ti } if (out[0].compare(0, kv.second.size(), kv.second) == 0) { const auto index = - std::stoul(out[0].substr(kv.second.size(), 2), nullptr, 16); + std::strtoul(out[0].substr(kv.second.size(), 2).c_str(), nullptr, 16); const auto sub = kv.first.second; if (sub == 0) { s128_keys[{kv.first.first, index, 0}] = @@ -696,7 +770,7 @@ void KeyManager::LoadFromFile(const std::filesystem::path& file_path, bool is_ti const auto& match = kak_names[j]; if (out[0].compare(0, std::strlen(match), match) == 0) { const auto index = - std::stoul(out[0].substr(std::strlen(match), 2), nullptr, 16); + std::strtoul(out[0].substr(std::strlen(match), 2).c_str(), nullptr, 16); s128_keys[{S128KeyType::KeyArea, index, j}] = Common::HexStringToArray<16>(out[1]); } @@ -1110,56 +1184,38 @@ void KeyManager::DeriveETicket(PartitionDataManager& data, eticket_extended_kek = data.GetETicketExtendedKek(); WriteKeyToFile(KeyCategory::Console, "eticket_extended_kek", eticket_extended_kek); + DeriveETicketRSAKey(); PopulateTickets(); } void KeyManager::PopulateTickets() { - const auto rsa_key = GetETicketRSAKey(); - - if (rsa_key == RSAKeyPair<2048>{}) { + if (ticket_databases_loaded) { return; } + ticket_databases_loaded = true; - if (!common_tickets.empty() && !personal_tickets.empty()) { - return; - } + std::vector<Ticket> tickets; const auto system_save_e1_path = Common::FS::GetYuzuPath(Common::FS::YuzuPath::NANDDir) / "system/save/80000000000000e1"; - - const Common::FS::IOFile save_e1{system_save_e1_path, Common::FS::FileAccessMode::Read, - Common::FS::FileType::BinaryFile}; + if (Common::FS::Exists(system_save_e1_path)) { + const Common::FS::IOFile save_e1{system_save_e1_path, Common::FS::FileAccessMode::Read, + Common::FS::FileType::BinaryFile}; + const auto blob1 = GetTicketblob(save_e1); + tickets.insert(tickets.end(), blob1.begin(), blob1.end()); + } const auto system_save_e2_path = Common::FS::GetYuzuPath(Common::FS::YuzuPath::NANDDir) / "system/save/80000000000000e2"; + if (Common::FS::Exists(system_save_e2_path)) { + const Common::FS::IOFile save_e2{system_save_e2_path, Common::FS::FileAccessMode::Read, + Common::FS::FileType::BinaryFile}; + const auto blob2 = GetTicketblob(save_e2); + tickets.insert(tickets.end(), blob2.begin(), blob2.end()); + } - const Common::FS::IOFile save_e2{system_save_e2_path, Common::FS::FileAccessMode::Read, - Common::FS::FileType::BinaryFile}; - - const auto blob2 = GetTicketblob(save_e2); - auto res = GetTicketblob(save_e1); - - const auto idx = res.size(); - res.insert(res.end(), blob2.begin(), blob2.end()); - - for (std::size_t i = 0; i < res.size(); ++i) { - const auto common = i < idx; - const auto pair = ParseTicket(res[i], rsa_key); - if (!pair) { - continue; - } - - const auto& [rid, key] = *pair; - u128 rights_id; - std::memcpy(rights_id.data(), rid.data(), rid.size()); - - if (common) { - common_tickets[rights_id] = res[i]; - } else { - personal_tickets[rights_id] = res[i]; - } - - SetKey(S128KeyType::Titlekey, key, rights_id[1], rights_id[0]); + for (const auto& ticket : tickets) { + AddTicket(ticket); } } @@ -1291,41 +1347,33 @@ const std::map<u128, Ticket>& KeyManager::GetPersonalizedTickets() const { return personal_tickets; } -bool KeyManager::AddTicketCommon(Ticket raw) { - const auto rsa_key = GetETicketRSAKey(); - if (rsa_key == RSAKeyPair<2048>{}) { - return false; - } - - const auto pair = ParseTicket(raw, rsa_key); - if (!pair) { +bool KeyManager::AddTicket(const Ticket& ticket) { + if (!ticket.IsValid()) { + LOG_WARNING(Crypto, "Attempted to add invalid ticket."); return false; } - const auto& [rid, key] = *pair; + const auto& rid = ticket.GetData().rights_id; u128 rights_id; std::memcpy(rights_id.data(), rid.data(), rid.size()); - common_tickets[rights_id] = raw; - SetKey(S128KeyType::Titlekey, key, rights_id[1], rights_id[0]); - return true; -} + if (ticket.GetData().type == Core::Crypto::TitleKeyType::Common) { + common_tickets[rights_id] = ticket; + } else { + personal_tickets[rights_id] = ticket; + } -bool KeyManager::AddTicketPersonalized(Ticket raw) { - const auto rsa_key = GetETicketRSAKey(); - if (rsa_key == RSAKeyPair<2048>{}) { - return false; + if (HasKey(S128KeyType::Titlekey, rights_id[1], rights_id[0])) { + LOG_DEBUG(Crypto, + "Skipping parsing title key from ticket for known rights ID {:016X}{:016X}.", + rights_id[1], rights_id[0]); + return true; } - const auto pair = ParseTicket(raw, rsa_key); - if (!pair) { + const auto key = ParseTicketTitleKey(ticket); + if (!key) { return false; } - - const auto& [rid, key] = *pair; - u128 rights_id; - std::memcpy(rights_id.data(), rid.data(), rid.size()); - common_tickets[rights_id] = raw; - SetKey(S128KeyType::Titlekey, key, rights_id[1], rights_id[0]); + SetKey(S128KeyType::Titlekey, key.value(), rights_id[1], rights_id[0]); return true; } } // namespace Core::Crypto |