diff options
Diffstat (limited to 'src/core/crypto/key_manager.cpp')
| -rw-r--r-- | src/core/crypto/key_manager.cpp | 241 |
1 files changed, 207 insertions, 34 deletions
diff --git a/src/core/crypto/key_manager.cpp b/src/core/crypto/key_manager.cpp index 6dd633363..46aceec3d 100644 --- a/src/core/crypto/key_manager.cpp +++ b/src/core/crypto/key_manager.cpp @@ -37,6 +37,7 @@ namespace Core::Crypto { constexpr u64 CURRENT_CRYPTO_REVISION = 0x5; +constexpr u64 FULL_TICKET_SIZE = 0x400; using namespace Common; @@ -55,6 +56,99 @@ const std::map<std::pair<S128KeyType, u64>, std::string> KEYS_VARIABLE_LENGTH{ {{S128KeyType::KeyblobMAC, 0}, "keyblob_mac_key_"}, }; +namespace { +template <std::size_t Size> +bool IsAllZeroArray(const std::array<u8, Size>& array) { + return std::all_of(array.begin(), array.end(), [](const auto& elem) { return elem == 0; }); +} +} // namespace + +u64 GetSignatureTypeDataSize(SignatureType type) { + switch (type) { + case SignatureType::RSA_4096_SHA1: + case SignatureType::RSA_4096_SHA256: + return 0x200; + case SignatureType::RSA_2048_SHA1: + case SignatureType::RSA_2048_SHA256: + return 0x100; + case SignatureType::ECDSA_SHA1: + case SignatureType::ECDSA_SHA256: + return 0x3C; + } + UNREACHABLE(); +} + +u64 GetSignatureTypePaddingSize(SignatureType type) { + switch (type) { + case SignatureType::RSA_4096_SHA1: + case SignatureType::RSA_4096_SHA256: + case SignatureType::RSA_2048_SHA1: + case SignatureType::RSA_2048_SHA256: + return 0x3C; + case SignatureType::ECDSA_SHA1: + case SignatureType::ECDSA_SHA256: + return 0x40; + } + UNREACHABLE(); +} + +SignatureType Ticket::GetSignatureType() const { + if (auto ticket = std::get_if<RSA4096Ticket>(&data)) { + return ticket->sig_type; + } + if (auto ticket = std::get_if<RSA2048Ticket>(&data)) { + return ticket->sig_type; + } + if (auto ticket = std::get_if<ECDSATicket>(&data)) { + return ticket->sig_type; + } + + UNREACHABLE(); +} + +TicketData& Ticket::GetData() { + if (auto ticket = std::get_if<RSA4096Ticket>(&data)) { + return ticket->data; + } + if (auto ticket = std::get_if<RSA2048Ticket>(&data)) { + return ticket->data; + } + if (auto ticket = std::get_if<ECDSATicket>(&data)) { + return ticket->data; + } + + UNREACHABLE(); +} + +const TicketData& Ticket::GetData() const { + if (auto ticket = std::get_if<RSA4096Ticket>(&data)) { + return ticket->data; + } + if (auto ticket = std::get_if<RSA2048Ticket>(&data)) { + return ticket->data; + } + if (auto ticket = std::get_if<ECDSATicket>(&data)) { + return ticket->data; + } + + UNREACHABLE(); +} + +u64 Ticket::GetSize() const { + const auto sig_type = GetSignatureType(); + + return sizeof(SignatureType) + GetSignatureTypeDataSize(sig_type) + + GetSignatureTypePaddingSize(sig_type) + sizeof(TicketData); +} + +Ticket Ticket::SynthesizeCommon(Key128 title_key, const std::array<u8, 16>& rights_id) { + RSA2048Ticket out{}; + out.sig_type = SignatureType::RSA_2048_SHA256; + out.data.rights_id = rights_id; + out.data.title_key_common = title_key; + return Ticket{out}; +} + Key128 GenerateKeyEncryptionKey(Key128 source, Key128 master, Key128 kek_seed, Key128 key_seed) { Key128 out{}; @@ -135,6 +229,27 @@ void KeyManager::DeriveGeneralPurposeKeys(std::size_t crypto_revision) { } } +RSAKeyPair<2048> KeyManager::GetETicketRSAKey() const { + if (IsAllZeroArray(eticket_extended_kek) || !HasKey(S128KeyType::ETicketRSAKek)) + return {}; + + const auto eticket_final = GetKey(S128KeyType::ETicketRSAKek); + + std::vector<u8> extended_iv(eticket_extended_kek.begin(), eticket_extended_kek.begin() + 0x10); + std::array<u8, 0x230> extended_dec{}; + AESCipher<Key128> rsa_1(eticket_final, Mode::CTR); + rsa_1.SetIV(extended_iv); + 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; +} + Key128 DeriveKeyblobMACKey(const Key128& keyblob_key, const Key128& mac_source) { AESCipher<Key128> mac_cipher(keyblob_key, Mode::ECB); Key128 mac_key{}; @@ -237,7 +352,7 @@ Loader::ResultStatus DeriveSDKeys(std::array<Key256, 2>& sd_keys, KeyManager& ke return Loader::ResultStatus::Success; } -std::vector<TicketRaw> GetTicketblob(const FileUtil::IOFile& ticket_save) { +std::vector<Ticket> GetTicketblob(const FileUtil::IOFile& ticket_save) { if (!ticket_save.IsOpen()) return {}; @@ -246,14 +361,14 @@ std::vector<TicketRaw> GetTicketblob(const FileUtil::IOFile& ticket_save) { return {}; } - std::vector<TicketRaw> out; + std::vector<Ticket> out; 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(TicketRaw)); - offset += next.size(); + std::memcpy(&next, buffer.data() + offset, sizeof(Ticket)); + offset += FULL_TICKET_SIZE; } } @@ -305,29 +420,23 @@ static std::optional<u64> FindTicketOffset(const std::array<u8, size>& data) { return offset; } -std::optional<std::pair<Key128, Key128>> ParseTicket(const TicketRaw& ticket, +std::optional<std::pair<Key128, Key128>> ParseTicket(const Ticket& ticket, const RSAKeyPair<2048>& key) { - u32 cert_authority; - std::memcpy(&cert_authority, ticket.data() + 0x140, sizeof(cert_authority)); - if (cert_authority == 0) + const auto issuer = ticket.GetData().issuer; + if (issuer == std::array<u8, 0x40>{}) return {}; - if (cert_authority != Common::MakeMagic('R', 'o', 'o', 't')) { - LOG_INFO(Crypto, - "Attempting to parse ticket with non-standard certificate authority {:08X}.", - cert_authority); + 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."); } - Key128 rights_id; - std::memcpy(rights_id.data(), ticket.data() + 0x2A0, sizeof(Key128)); + Key128 rights_id = ticket.GetData().rights_id; if (rights_id == Key128{}) return {}; - Key128 key_temp{}; - - if (!std::any_of(ticket.begin() + 0x190, ticket.begin() + 0x280, [](u8 b) { return b != 0; })) { - std::memcpy(key_temp.data(), ticket.data() + 0x180, key_temp.size()); - return std::make_pair(rights_id, key_temp); + 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); } mbedtls_mpi D; // RSA Private Exponent @@ -342,7 +451,7 @@ std::optional<std::pair<Key128, Key128>> ParseTicket(const TicketRaw& ticket, 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.data() + 0x180, 0x100); + mbedtls_mpi_read_binary(&S, ticket.GetData().title_key_block.data(), 0x100); mbedtls_mpi_exp_mod(&M, &S, &D, &N, nullptr); @@ -366,6 +475,7 @@ std::optional<std::pair<Key128, Key128>> ParseTicket(const TicketRaw& ticket, return {}; ASSERT(*offset > 0); + Key128 key_temp{}; std::memcpy(key_temp.data(), m_2.data() + *offset, key_temp.size()); return std::make_pair(rights_id, key_temp); @@ -450,6 +560,8 @@ void KeyManager::LoadFromFile(const std::string& filename, bool is_title_keys) { const auto index = std::stoul(out[0].substr(18, 2), 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 { for (const auto& kv : KEYS_VARIABLE_LENGTH) { if (!ValidCryptoRevisionString(out[0], kv.second.size(), 2)) @@ -862,20 +974,19 @@ void KeyManager::DeriveETicket(PartitionDataManager& data) { // Titlekeys data.DecryptProdInfo(GetBISKey(0)); - const auto eticket_extended_kek = data.GetETicketExtendedKek(); + eticket_extended_kek = data.GetETicketExtendedKek(); + WriteKeyToFile(KeyCategory::Console, "eticket_extended_kek", eticket_extended_kek); + PopulateTickets(); +} - std::vector<u8> extended_iv(0x10); - std::memcpy(extended_iv.data(), eticket_extended_kek.data(), extended_iv.size()); - std::array<u8, 0x230> extended_dec{}; - AESCipher<Key128> rsa_1(eticket_final, Mode::CTR); - rsa_1.SetIV(extended_iv); - rsa_1.Transcode(eticket_extended_kek.data() + 0x10, eticket_extended_kek.size() - 0x10, - extended_dec.data(), Op::Decrypt); +void KeyManager::PopulateTickets() { + const auto rsa_key = GetETicketRSAKey(); - 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()); + if (rsa_key == RSAKeyPair<2048>{}) + return; + + if (!common_tickets.empty() && !personal_tickets.empty()) + return; const FileUtil::IOFile save1(FileUtil::GetUserPath(FileUtil::UserPath::NANDDir) + "/system/save/80000000000000e1", @@ -886,19 +997,41 @@ void KeyManager::DeriveETicket(PartitionDataManager& data) { const auto blob2 = GetTicketblob(save2); auto res = GetTicketblob(save1); + const auto idx = res.size(); res.insert(res.end(), blob2.begin(), blob2.end()); - for (const auto& raw : res) { - const auto pair = ParseTicket(raw, rsa_key); + 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]); } } +void KeyManager::SynthesizeTickets() { + for (const auto& key : s128_keys) { + if (key.first.type != S128KeyType::Titlekey) { + continue; + } + u128 rights_id{key.first.field1, key.first.field2}; + Key128 rights_id_2; + std::memcpy(rights_id_2.data(), rights_id.data(), rights_id_2.size()); + const auto ticket = Ticket::SynthesizeCommon(key.second, rights_id_2); + common_tickets.insert_or_assign(rights_id, ticket); + } +} + void KeyManager::SetKeyWrapped(S128KeyType id, Key128 key, u64 field1, u64 field2) { if (key == Key128{}) return; @@ -997,6 +1130,46 @@ void KeyManager::PopulateFromPartitionData(PartitionDataManager& data) { DeriveBase(); } +const std::map<u128, Ticket>& KeyManager::GetCommonTickets() const { + return common_tickets; +} + +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) + 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]); + return true; +} + +bool KeyManager::AddTicketPersonalized(Ticket raw) { + const auto rsa_key = GetETicketRSAKey(); + if (rsa_key == RSAKeyPair<2048>{}) + return false; + + const auto pair = ParseTicket(raw, rsa_key); + if (!pair) + 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]); + return true; +} + const boost::container::flat_map<std::string, KeyIndex<S128KeyType>> KeyManager::s128_file_id = { {"eticket_rsa_kek", {S128KeyType::ETicketRSAKek, 0, 0}}, {"eticket_rsa_kek_source", |