key_manager: Add ETicket key derivation
Derives titlekeys
This commit is contained in:
Zach Hilman
parent
a57aac5772
commit
d041d6231c
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@ -70,6 +70,7 @@ add_library(core STATIC
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file_sys/vfs_real.cpp
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file_sys/vfs_real.h
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file_sys/vfs_static.h
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file_sys/vfs_types.h
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file_sys/vfs_vector.cpp
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file_sys/vfs_vector.h
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file_sys/xts_archive.cpp
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@ -4,18 +4,30 @@
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#include <algorithm>
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#include <array>
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#include <bitset>
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#include <fstream>
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#include <locale>
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#include <map>
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#include <sstream>
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#include <string_view>
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#include <tuple>
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#include <vector>
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#include <mbedtls/bignum.h>
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#include <mbedtls/cipher.h>
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#include <mbedtls/cmac.h>
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#include <mbedtls/sha256.h>
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#include "common/common_funcs.h"
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#include "common/common_paths.h"
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#include "common/file_util.h"
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#include "common/hex_util.h"
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#include "common/logging/log.h"
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#include "core/crypto/aes_util.h"
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#include "core/crypto/key_manager.h"
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#include "core/file_sys/content_archive.h"
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#include "core/file_sys/nca_metadata.h"
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#include "core/file_sys/partition_filesystem.h"
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#include "core/file_sys/registered_cache.h"
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#include "core/hle/service/filesystem/filesystem.h"
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#include "core/loader/loader.h"
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#include "core/settings.h"
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@ -23,6 +35,13 @@ namespace Core::Crypto {
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constexpr u64 CURRENT_CRYPTO_REVISION = 0x5;
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using namespace Common;
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const static std::array<SHA256Hash, 4> eticket_source_hashes{
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"B71DB271DC338DF380AA2C4335EF8873B1AFD408E80B3582D8719FC81C5E511C"_array32, // eticket_rsa_kek_source
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"E8965A187D30E57869F562D04383C996DE487BBA5761363D2D4D32391866A85C"_array32, // eticket_rsa_kekek_source
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};
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Key128 GenerateKeyEncryptionKey(Key128 source, Key128 master, Key128 kek_seed, Key128 key_seed) {
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Key128 out{};
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@ -129,9 +148,131 @@ Loader::ResultStatus DeriveSDKeys(std::array<Key256, 2>& sd_keys, KeyManager& ke
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return source; ///< Return unaltered source to satisfy output requirement.
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});
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keys.SetKey(S256KeyType::SDKey, sd_keys[0], static_cast<u64>(SDKeyType::Save));
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keys.SetKey(S256KeyType::SDKey, sd_keys[1], static_cast<u64>(SDKeyType::NCA));
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return Loader::ResultStatus::Success;
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}
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std::vector<TicketRaw> GetTicketblob(const FileUtil::IOFile& ticket_save) {
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if (!ticket_save.IsOpen())
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return {};
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std::vector<u8> buffer(ticket_save.GetSize());
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ticket_save.ReadBytes(buffer.data(), buffer.size());
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std::vector<TicketRaw> out;
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u32 magic{};
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for (std::size_t offset = 0; offset + 0x4 < buffer.size(); ++offset) {
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if (buffer[offset] == 0x4 && buffer[offset + 1] == 0x0 && buffer[offset + 2] == 0x1 &&
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buffer[offset + 3] == 0x0) {
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TicketRaw next{};
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std::memcpy(&next, buffer.data() + offset, sizeof(TicketRaw));
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offset += next.size();
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out.push_back(next);
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}
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}
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return out;
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}
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template <size_t size>
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static std::array<u8, size> operator^(const std::array<u8, size>& lhs,
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const std::array<u8, size>& rhs) {
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std::array<u8, size> out{};
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for (size_t i = 0; i < size; ++i)
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out[i] = lhs[i] ^ rhs[i];
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return out;
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}
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template <size_t target_size, size_t in_size>
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static std::array<u8, target_size> MGF1(const std::array<u8, in_size>& seed) {
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std::array<u8, in_size + 4> seed_exp{};
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std::memcpy(seed_exp.data(), seed.data(), in_size);
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std::vector<u8> out;
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size_t i = 0;
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while (out.size() < target_size) {
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out.resize(out.size() + 0x20, 0);
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seed_exp[in_size + 3] = i;
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mbedtls_sha256(seed_exp.data(), seed_exp.size(), out.data() + out.size() - 0x20, 0);
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++i;
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}
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std::array<u8, target_size> target{};
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std::memcpy(target.data(), out.data(), target_size);
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return target;
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}
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boost::optional<std::pair<Key128, Key128>> ParseTicket(const TicketRaw& ticket,
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const RSAKeyPair<2048>& key) {
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u32 cert_authority;
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std::memcpy(&cert_authority, ticket.data() + 0x140, sizeof(cert_authority));
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if (cert_authority == 0)
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return boost::none;
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if (cert_authority != Common::MakeMagic('R', 'o', 'o', 't'))
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LOG_INFO(Crypto,
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"Attempting to parse ticket with non-standard certificate authority {:08X}.",
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cert_authority);
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Key128 rights_id{};
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std::memcpy(rights_id.data(), ticket.data() + 0x2A0, sizeof(Key128));
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Key128 key_temp{};
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if (!std::any_of(ticket.begin() + 0x190, ticket.begin() + 0x280, [](u8 b) { return b != 0; })) {
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std::memcpy(key_temp.data(), ticket.data() + 0x180, key_temp.size());
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return std::pair<Key128, Key128>{rights_id, key_temp};
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}
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mbedtls_mpi D; // RSA Private Exponent
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mbedtls_mpi N; // RSA Modulus
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mbedtls_mpi S; // Input
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mbedtls_mpi M; // Output
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mbedtls_mpi_init(&D);
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mbedtls_mpi_init(&N);
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mbedtls_mpi_init(&S);
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mbedtls_mpi_init(&M);
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mbedtls_mpi_read_binary(&D, key.decryption_key.data(), key.decryption_key.size());
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mbedtls_mpi_read_binary(&N, key.modulus.data(), key.modulus.size());
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mbedtls_mpi_read_binary(&S, ticket.data() + 0x180, 0x100);
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mbedtls_mpi_exp_mod(&M, &S, &D, &N, nullptr);
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std::array<u8, 0x100> rsa_step{};
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mbedtls_mpi_write_binary(&M, rsa_step.data(), rsa_step.size());
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u8 m_0 = rsa_step[0];
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std::array<u8, 0x20> m_1{};
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std::memcpy(m_1.data(), rsa_step.data() + 0x01, m_1.size());
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std::array<u8, 0xDF> m_2{};
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std::memcpy(m_2.data(), rsa_step.data() + 0x21, m_2.size());
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if (m_0 != 0)
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return boost::none;
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m_1 = m_1 ^ MGF1<0x20>(m_2);
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m_2 = m_2 ^ MGF1<0xDF>(m_1);
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u64 offset = 0;
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for (size_t i = 0x20; i < m_2.size() - 0x10; ++i) {
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if (m_2[i] == 0x1) {
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offset = i + 1;
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break;
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} else if (m_2[i] != 0x0) {
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return boost::none;
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}
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}
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ASSERT(offset > 0);
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std::memcpy(key_temp.data(), m_2.data() + offset, key_temp.size());
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return std::pair<Key128, Key128>{rights_id, key_temp};
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}
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KeyManager::KeyManager() {
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// Initialize keys
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const std::string hactool_keys_dir = FileUtil::GetHactoolConfigurationPath();
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@ -609,6 +750,114 @@ void KeyManager::DeriveBase() {
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SetKey(S256KeyType::Header, out);
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}
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}
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void KeyManager::DeriveETicket(PartitionDataManager data) {
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// ETicket keys
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const auto es = Service::FileSystem::GetUnionContents()->GetEntry(
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0x0100000000000033, FileSys::ContentRecordType::Program);
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if (es == nullptr)
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return;
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const auto exefs = es->GetExeFS();
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if (exefs == nullptr)
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return;
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const auto main = exefs->GetFile("main");
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if (main == nullptr)
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return;
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const auto bytes = main->ReadAllBytes();
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using namespace Common;
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const auto eticket_kek = FindKeyFromHex(bytes, eticket_source_hashes[0]);
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const auto eticket_kekek = FindKeyFromHex(bytes, eticket_source_hashes[1]);
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const auto seed3 = data.GetRSAKekSeed3();
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const auto mask0 = data.GetRSAKekMask0();
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if (eticket_kek != Key128{})
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SetKey(S128KeyType::Source, eticket_kek, static_cast<size_t>(SourceKeyType::ETicketKek));
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if (eticket_kekek != Key128{})
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SetKey(S128KeyType::Source, eticket_kekek,
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static_cast<size_t>(SourceKeyType::ETicketKekek));
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if (seed3 != Key128{})
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SetKey(S128KeyType::RSAKek, seed3, static_cast<size_t>(RSAKekType::Seed3));
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if (mask0 != Key128{})
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SetKey(S128KeyType::RSAKek, mask0, static_cast<size_t>(RSAKekType::Mask0));
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if (eticket_kek == Key128{} || eticket_kekek == Key128{} || seed3 == Key128{} ||
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mask0 == Key128{})
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return;
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Key128 rsa_oaep_kek{};
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for (size_t i = 0; i < rsa_oaep_kek.size(); ++i)
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rsa_oaep_kek[i] = seed3[i] ^ mask0[i];
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if (rsa_oaep_kek == Key128{})
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return;
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SetKey(S128KeyType::Source, rsa_oaep_kek,
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static_cast<u64>(SourceKeyType::RSAOaepKekGeneration));
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Key128 temp_kek{};
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Key128 temp_kekek{};
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Key128 eticket_final{};
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// Derive ETicket RSA Kek
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AESCipher<Key128> es_master(GetKey(S128KeyType::Master), Mode::ECB);
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es_master.Transcode(rsa_oaep_kek.data(), rsa_oaep_kek.size(), temp_kek.data(), Op::Decrypt);
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AESCipher<Key128> es_kekek(temp_kek, Mode::ECB);
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es_kekek.Transcode(eticket_kekek.data(), eticket_kekek.size(), temp_kekek.data(), Op::Decrypt);
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AESCipher<Key128> es_kek(temp_kekek, Mode::ECB);
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es_kek.Transcode(eticket_kek.data(), eticket_kek.size(), eticket_final.data(), Op::Decrypt);
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if (eticket_final == Key128{})
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return;
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SetKey(S128KeyType::ETicketRSAKek, eticket_final);
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// Titlekeys
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data.DecryptProdInfo(GetKey(S128KeyType::BIS),
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GetKey(S128KeyType::BIS, 0, static_cast<u64>(BISKeyType::Tweak)));
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const auto eticket_extended_kek = data.GetETicketExtendedKek();
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std::vector<u8> extended_iv(0x10);
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std::memcpy(extended_iv.data(), eticket_extended_kek.data(), extended_iv.size());
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std::array<u8, 0x230> extended_dec{};
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AESCipher<Key128> rsa_1(eticket_final, Mode::CTR);
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rsa_1.SetIV(extended_iv);
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rsa_1.Transcode(eticket_extended_kek.data() + 0x10, eticket_extended_kek.size() - 0x10,
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extended_dec.data(), Op::Decrypt);
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RSAKeyPair<2048> rsa_key{};
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std::memcpy(rsa_key.decryption_key.data(), extended_dec.data(), rsa_key.decryption_key.size());
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std::memcpy(rsa_key.modulus.data(), extended_dec.data() + 0x100, rsa_key.modulus.size());
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std::memcpy(rsa_key.exponent.data(), extended_dec.data() + 0x200, rsa_key.exponent.size());
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const FileUtil::IOFile save1(FileUtil::GetUserPath(FileUtil::UserPath::NANDDir) +
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"/system/save/80000000000000e1",
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"rb+");
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const FileUtil::IOFile save2(FileUtil::GetUserPath(FileUtil::UserPath::NANDDir) +
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"/system/save/80000000000000e2",
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"rb+");
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auto res = GetTicketblob(save1);
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const auto res2 = GetTicketblob(save2);
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std::copy(res2.begin(), res2.end(), std::back_inserter(res));
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for (const auto& raw : res) {
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const auto pair = ParseTicket(raw, rsa_key);
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if (pair == boost::none)
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continue;
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auto [rid, key] = pair.value();
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u128 rights_id{};
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std::memcpy(rights_id.data(), rid.data(), rid.size());
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SetKey(S128KeyType::Titlekey, key, rights_id[1], rights_id[0]);
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}
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}
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void KeyManager::SetKeyWrapped(S128KeyType id, Key128 key, u64 field1, u64 field2) {
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if (key == Key128{})
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return;
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@ -5,11 +5,18 @@
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#pragma once
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#include <array>
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#include <map>
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#include <string>
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#include <boost/container/flat_map.hpp>
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#include <boost/optional.hpp>
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#include <fmt/format.h>
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#include "common/common_types.h"
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#include "core/file_sys/vfs_types.h"
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#include "partition_data_manager.h"
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namespace FileUtil {
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class IOFile;
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}
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namespace Loader {
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enum class ResultStatus : u16;
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@ -22,9 +29,18 @@ constexpr u64 TICKET_FILE_TITLEKEY_OFFSET = 0x180;
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using Key128 = std::array<u8, 0x10>;
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using Key256 = std::array<u8, 0x20>;
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using SHA256Hash = std::array<u8, 0x20>;
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using TicketRaw = std::array<u8, 0x400>;
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static_assert(sizeof(Key128) == 16, "Key128 must be 128 bytes big.");
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static_assert(sizeof(Key256) == 32, "Key128 must be 128 bytes big.");
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static_assert(sizeof(Key256) == 32, "Key256 must be 256 bytes big.");
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template <size_t bit_size, size_t byte_size = (bit_size >> 3)>
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struct RSAKeyPair {
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std::array<u8, byte_size> encryption_key;
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std::array<u8, byte_size> decryption_key;
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std::array<u8, byte_size> modulus;
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std::array<u8, 4> exponent;
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};
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enum class KeyCategory : u8 {
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Standard,
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@ -140,6 +156,8 @@ public:
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bool BaseDeriveNecessary();
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void DeriveBase();
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void DeriveETicket(PartitionDataManager data);
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private:
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std::map<KeyIndex<S128KeyType>, Key128> s128_keys;
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std::map<KeyIndex<S256KeyType>, Key256> s256_keys;
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@ -166,6 +184,13 @@ Key128 GenerateKeyEncryptionKey(Key128 source, Key128 master, Key128 kek_seed, K
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Key128 DeriveKeyblobKey(Key128 sbk, Key128 tsec, Key128 source);
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boost::optional<Key128> DeriveSDSeed();
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Loader::ResultStatus DeriveSDKeys(std::array<Key256, 2>& sd_keys, const KeyManager& keys);
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Loader::ResultStatus DeriveSDKeys(std::array<Key256, 2>& sd_keys, KeyManager& keys);
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std::vector<TicketRaw> GetTicketblob(const FileUtil::IOFile& ticket_save);
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// Returns a pair of {rights_id, titlekey}. Fails if the ticket has no certificate authority (offset
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// 0x140-0x144 is zero)
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boost::optional<std::pair<Key128, Key128>> ParseTicket(
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const TicketRaw& ticket, const RSAKeyPair<2048>& eticket_extended_key);
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} // namespace Core::Crypto
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