summaryrefslogtreecommitdiffstats
path: root/src/core/crypto/key_manager.cpp
blob: bd4b3d7c7e229973104d1e4a780b4dc15b8a6a5d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <algorithm>
#include <array>
#include <fstream>
#include <locale>
#include <sstream>
#include <string_view>
#include <tuple>
#include <vector>
#include "common/common_paths.h"
#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/loader/loader.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();
    const std::string yuzu_keys_dir = FileUtil::GetUserPath(FileUtil::UserPath::KeysDir);
    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) {
    std::ifstream file(filename);
    if (!file.is_open())
        return;

    std::string line;
    while (std::getline(file, line)) {
        std::vector<std::string> out;
        std::stringstream stream(line);
        std::string item;
        while (std::getline(stream, item, '='))
            out.push_back(std::move(item));

        if (out.size() != 2)
            continue;

        out[0].erase(std::remove(out[0].begin(), out[0].end(), ' '), out[0].end());
        out[1].erase(std::remove(out[1].begin(), out[1].end(), ' '), out[1].end());

        if (is_title_keys) {
            auto rights_id_raw = Common::HexStringToArray<16>(out[0]);
            u128 rights_id{};
            std::memcpy(rights_id.data(), rights_id_raw.data(), rights_id_raw.size());
            Key128 key = Common::HexStringToArray<16>(out[1]);
            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]);
                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]);
                s256_keys[{index.type, index.field1, index.field2}] = key;
            }
        }
    }
}

void KeyManager::AttemptLoadKeyFile(const std::string& dir1, const std::string& dir2,
                                    const std::string& filename, bool title) {
    if (FileUtil::Exists(dir1 + DIR_SEP + filename))
        LoadFromFile(dir1 + DIR_SEP + filename, title);
    else if (FileUtil::Exists(dir2 + DIR_SEP + filename))
        LoadFromFile(dir2 + DIR_SEP + filename, title);
}

bool KeyManager::HasKey(S128KeyType id, u64 field1, u64 field2) const {
    return s128_keys.find({id, field1, field2}) != s128_keys.end();
}

bool KeyManager::HasKey(S256KeyType id, u64 field1, u64 field2) const {
    return s256_keys.find({id, field1, field2}) != s256_keys.end();
}

Key128 KeyManager::GetKey(S128KeyType id, u64 field1, u64 field2) const {
    if (!HasKey(id, field1, field2))
        return {};
    return s128_keys.at({id, field1, field2});
}

Key256 KeyManager::GetKey(S256KeyType id, u64 field1, u64 field2) const {
    if (!HasKey(id, field1, field2))
        return {};
    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) {
    if (s128_keys.find({id, field1, field2}) != s128_keys.end())
        return;
    if (id == S128KeyType::Titlekey) {
        Key128 rights_id;
        std::memcpy(rights_id.data(), &field2, sizeof(u64));
        std::memcpy(rights_id.data() + sizeof(u64), &field1, sizeof(u64));
        WriteKeyToFile(true, fmt::format("{}", Common::HexArrayToString(rights_id)), key);
    }
    const auto iter2 = 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 (iter2 != s128_file_id.end())
        WriteKeyToFile(false, iter2->first, key);
    s128_keys[{id, field1, field2}] = key;
}

void KeyManager::SetKey(S256KeyType id, Key256 key, u64 field1, u64 field2) {
    if (s256_keys.find({id, field1, field2}) != s256_keys.end())
        return;
    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;
}

bool KeyManager::KeyFileExists(bool title) {
    const std::string hactool_keys_dir = FileUtil::GetHactoolConfigurationPath();
    const std::string yuzu_keys_dir = FileUtil::GetUserPath(FileUtil::UserPath::KeysDir);
    if (title) {
        return FileUtil::Exists(hactool_keys_dir + DIR_SEP + "title.keys") ||
               FileUtil::Exists(yuzu_keys_dir + DIR_SEP + "title.keys");
    }

    if (Settings::values.use_dev_keys) {
        return FileUtil::Exists(hactool_keys_dir + DIR_SEP + "dev.keys") ||
               FileUtil::Exists(yuzu_keys_dir + DIR_SEP + "dev.keys");
    }

    return FileUtil::Exists(hactool_keys_dir + DIR_SEP + "prod.keys") ||
           FileUtil::Exists(yuzu_keys_dir + DIR_SEP + "prod.keys");
}

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}},
    {"master_key_03", {S128KeyType::Master, 3, 0}},
    {"master_key_04", {S128KeyType::Master, 4, 0}},
    {"package1_key_00", {S128KeyType::Package1, 0, 0}},
    {"package1_key_01", {S128KeyType::Package1, 1, 0}},
    {"package1_key_02", {S128KeyType::Package1, 2, 0}},
    {"package1_key_03", {S128KeyType::Package1, 3, 0}},
    {"package1_key_04", {S128KeyType::Package1, 4, 0}},
    {"package2_key_00", {S128KeyType::Package2, 0, 0}},
    {"package2_key_01", {S128KeyType::Package2, 1, 0}},
    {"package2_key_02", {S128KeyType::Package2, 2, 0}},
    {"package2_key_03", {S128KeyType::Package2, 3, 0}},
    {"package2_key_04", {S128KeyType::Package2, 4, 0}},
    {"titlekek_00", {S128KeyType::Titlekek, 0, 0}},
    {"titlekek_01", {S128KeyType::Titlekek, 1, 0}},
    {"titlekek_02", {S128KeyType::Titlekek, 2, 0}},
    {"titlekek_03", {S128KeyType::Titlekek, 3, 0}},
    {"titlekek_04", {S128KeyType::Titlekek, 4, 0}},
    {"eticket_rsa_kek", {S128KeyType::ETicketRSAKek, 0, 0}},
    {"key_area_key_application_00",
     {S128KeyType::KeyArea, 0, static_cast<u64>(KeyAreaKeyType::Application)}},
    {"key_area_key_application_01",
     {S128KeyType::KeyArea, 1, static_cast<u64>(KeyAreaKeyType::Application)}},
    {"key_area_key_application_02",
     {S128KeyType::KeyArea, 2, static_cast<u64>(KeyAreaKeyType::Application)}},
    {"key_area_key_application_03",
     {S128KeyType::KeyArea, 3, static_cast<u64>(KeyAreaKeyType::Application)}},
    {"key_area_key_application_04",
     {S128KeyType::KeyArea, 4, static_cast<u64>(KeyAreaKeyType::Application)}},
    {"key_area_key_ocean_00", {S128KeyType::KeyArea, 0, static_cast<u64>(KeyAreaKeyType::Ocean)}},
    {"key_area_key_ocean_01", {S128KeyType::KeyArea, 1, static_cast<u64>(KeyAreaKeyType::Ocean)}},
    {"key_area_key_ocean_02", {S128KeyType::KeyArea, 2, static_cast<u64>(KeyAreaKeyType::Ocean)}},
    {"key_area_key_ocean_03", {S128KeyType::KeyArea, 3, static_cast<u64>(KeyAreaKeyType::Ocean)}},
    {"key_area_key_ocean_04", {S128KeyType::KeyArea, 4, static_cast<u64>(KeyAreaKeyType::Ocean)}},
    {"key_area_key_system_00", {S128KeyType::KeyArea, 0, static_cast<u64>(KeyAreaKeyType::System)}},
    {"key_area_key_system_01", {S128KeyType::KeyArea, 1, static_cast<u64>(KeyAreaKeyType::System)}},
    {"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 boost::container::flat_map<std::string, KeyIndex<S256KeyType>> KeyManager::s256_file_id = {
    {"header_key", {S256KeyType::Header, 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