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ams_mitm: implement automatic backups of biskeys/cal0

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This commit is contained in:
Michael Scire 2019-12-06 03:00:38 -08:00 committed by SciresM
parent b08a97d883
commit 16c638756c
4 changed files with 188 additions and 10 deletions
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40
stratosphere/ams_mitm/source/amsmitm_fs_utils.cpp
View file

@ -66,60 +66,82 @@ namespace ams::mitm::fs {
R_ASSERT(fsOpenSdCardFileSystem(&g_sd_filesystem));
}
Result CreateSdFile(const char *path, s64 size, s32 option) {
R_TRY(EnsureSdInitialized());
return fsFsCreateFile(&g_sd_filesystem, path, size, option);
}
Result CreateAtmosphereSdFile(const char *path, s64 size, s32 option) {
char fixed_path[ams::fs::EntryNameLengthMax + 1];
FormatAtmosphereSdPath(fixed_path, sizeof(fixed_path), path);
return CreateSdFile(fixed_path, size, option);
}
Result OpenSdFile(FsFile *out, const char *path, u32 mode) {
R_TRY(EnsureSdInitialized());
return fsFsOpenFile(&g_sd_filesystem, path, mode, out);
}
Result OpenAtmosphereSdFile(FsFile *out, const char *path, u32 mode) {
char fixed_path[FS_MAX_PATH];
char fixed_path[ams::fs::EntryNameLengthMax + 1];
FormatAtmosphereSdPath(fixed_path, sizeof(fixed_path), path);
return OpenSdFile(out, fixed_path, mode);
}
Result OpenAtmosphereSdFile(FsFile *out, ncm::ProgramId program_id, const char *path, u32 mode) {
char fixed_path[FS_MAX_PATH];
char fixed_path[ams::fs::EntryNameLengthMax + 1];
FormatAtmosphereSdPath(fixed_path, sizeof(fixed_path), program_id, path);
return OpenSdFile(out, fixed_path, mode);
}
Result OpenAtmosphereSdRomfsFile(FsFile *out, ncm::ProgramId program_id, const char *path, u32 mode) {
char fixed_path[FS_MAX_PATH];
char fixed_path[ams::fs::EntryNameLengthMax + 1];
FormatAtmosphereRomfsPath(fixed_path, sizeof(fixed_path), program_id, path);
return OpenSdFile(out, fixed_path, mode);
}
Result OpenAtmosphereRomfsFile(FsFile *out, ncm::ProgramId program_id, const char *path, u32 mode, FsFileSystem *fs) {
char fixed_path[FS_MAX_PATH];
char fixed_path[ams::fs::EntryNameLengthMax + 1];
FormatAtmosphereRomfsPath(fixed_path, sizeof(fixed_path), program_id, path);
return fsFsOpenFile(fs, fixed_path, mode, out);
}
Result CreateSdDirectory(const char *path) {
R_TRY(EnsureSdInitialized());
return fsFsCreateDirectory(&g_sd_filesystem, path);
}
Result CreateAtmosphereSdDirectory(const char *path) {
char fixed_path[ams::fs::EntryNameLengthMax + 1];
FormatAtmosphereSdPath(fixed_path, sizeof(fixed_path), path);
return CreateSdDirectory(fixed_path);
}
Result OpenSdDirectory(FsDir *out, const char *path, u32 mode) {
R_TRY(EnsureSdInitialized());
return fsFsOpenDirectory(&g_sd_filesystem, path, mode, out);
}
Result OpenAtmosphereSdDirectory(FsDir *out, const char *path, u32 mode) {
char fixed_path[FS_MAX_PATH];
char fixed_path[ams::fs::EntryNameLengthMax + 1];
FormatAtmosphereSdPath(fixed_path, sizeof(fixed_path), path);
return OpenSdDirectory(out, fixed_path, mode);
}
Result OpenAtmosphereSdDirectory(FsDir *out, ncm::ProgramId program_id, const char *path, u32 mode) {
char fixed_path[FS_MAX_PATH];
char fixed_path[ams::fs::EntryNameLengthMax + 1];
FormatAtmosphereSdPath(fixed_path, sizeof(fixed_path), program_id, path);
return OpenSdDirectory(out, fixed_path, mode);
}
Result OpenAtmosphereSdRomfsDirectory(FsDir *out, ncm::ProgramId program_id, const char *path, u32 mode) {
char fixed_path[FS_MAX_PATH];
char fixed_path[ams::fs::EntryNameLengthMax + 1];
FormatAtmosphereRomfsPath(fixed_path, sizeof(fixed_path), program_id, path);
return OpenSdDirectory(out, fixed_path, mode);
}
Result OpenAtmosphereRomfsDirectory(FsDir *out, ncm::ProgramId program_id, const char *path, u32 mode, FsFileSystem *fs) {
char fixed_path[FS_MAX_PATH];
char fixed_path[ams::fs::EntryNameLengthMax + 1];
FormatAtmosphereRomfsPath(fixed_path, sizeof(fixed_path), program_id, path);
return fsFsOpenDirectory(fs, fixed_path, mode, out);
}
@ -150,7 +172,7 @@ namespace ams::mitm::fs {
Result SaveAtmosphereSdFile(FsFile *out, ncm::ProgramId program_id, const char *path, void *data, size_t size) {
R_TRY(EnsureSdInitialized());
char fixed_path[FS_MAX_PATH];
char fixed_path[ams::fs::EntryNameLengthMax + 1];
FormatAtmosphereSdPath(fixed_path, sizeof(fixed_path), program_id, path);
/* Unconditionally create. */

4
stratosphere/ams_mitm/source/amsmitm_fs_utils.hpp
View file

@ -22,12 +22,16 @@ namespace ams::mitm::fs {
void OpenGlobalSdCardFileSystem();
/* Utilities. */
Result CreateSdFile(const char *path, s64 size, s32 option);
Result CreateAtmosphereSdFile(const char *path, s64 size, s32 option);
Result OpenSdFile(FsFile *out, const char *path, u32 mode);
Result OpenAtmosphereSdFile(FsFile *out, const char *path, u32 mode);
Result OpenAtmosphereSdFile(FsFile *out, ncm::ProgramId program_id, const char *path, u32 mode);
Result OpenAtmosphereSdRomfsFile(FsFile *out, ncm::ProgramId program_id, const char *path, u32 mode);
Result OpenAtmosphereRomfsFile(FsFile *out, ncm::ProgramId program_id, const char *path, u32 mode, FsFileSystem *fs);
Result CreateSdDirectory(const char *path);
Result CreateAtmosphereSdDirectory(const char *path);
Result OpenSdDirectory(FsDir *out, const char *path, u32 mode);
Result OpenAtmosphereSdDirectory(FsDir *out, const char *path, u32 mode);
Result OpenAtmosphereSdDirectory(FsDir *out, ncm::ProgramId program_id, const char *path, u32 mode);

153
stratosphere/ams_mitm/source/amsmitm_initialization.cpp
View file

@ -22,6 +22,30 @@ namespace ams::mitm {
namespace {
/* BIS key sources. */
constexpr u8 BisKeySources[4][2][0x10] = {
{
{0xF8, 0x3F, 0x38, 0x6E, 0x2C, 0xD2, 0xCA, 0x32, 0xA8, 0x9A, 0xB9, 0xAA, 0x29, 0xBF, 0xC7, 0x48},
{0x7D, 0x92, 0xB0, 0x3A, 0xA8, 0xBF, 0xDE, 0xE1, 0xA7, 0x4C, 0x3B, 0x6E, 0x35, 0xCB, 0x71, 0x06}
},
{
{0x41, 0x00, 0x30, 0x49, 0xDD, 0xCC, 0xC0, 0x65, 0x64, 0x7A, 0x7E, 0xB4, 0x1E, 0xED, 0x9C, 0x5F},
{0x44, 0x42, 0x4E, 0xDA, 0xB4, 0x9D, 0xFC, 0xD9, 0x87, 0x77, 0x24, 0x9A, 0xDC, 0x9F, 0x7C, 0xA4}
},
{
{0x52, 0xC2, 0xE9, 0xEB, 0x09, 0xE3, 0xEE, 0x29, 0x32, 0xA1, 0x0C, 0x1F, 0xB6, 0xA0, 0x92, 0x6C},
{0x4D, 0x12, 0xE1, 0x4B, 0x2A, 0x47, 0x4C, 0x1C, 0x09, 0xCB, 0x03, 0x59, 0xF0, 0x15, 0xF4, 0xE4}
},
{
{0x52, 0xC2, 0xE9, 0xEB, 0x09, 0xE3, 0xEE, 0x29, 0x32, 0xA1, 0x0C, 0x1F, 0xB6, 0xA0, 0x92, 0x6C},
{0x4D, 0x12, 0xE1, 0x4B, 0x2A, 0x47, 0x4C, 0x1C, 0x09, 0xCB, 0x03, 0x59, 0xF0, 0x15, 0xF4, 0xE4}
}
};
constexpr u8 BisKekSource[0x10] = {
0x34, 0xC1, 0xA0, 0xC4, 0x82, 0x58, 0xF8, 0xB4, 0xFA, 0x9E, 0x5E, 0x6A, 0xDA, 0xFC, 0x7E, 0x4F,
};
void InitializeThreadFunc(void *arg);
constexpr size_t InitializeThreadStackSize = 0x4000;
@ -31,6 +55,118 @@ namespace ams::mitm {
/* Globals. */
os::Event g_init_event(false);
/* Console-unique data backup and protection. */
constexpr size_t CalibrationBinarySize = 0x8000;
u8 g_calibration_binary_storage_backup[CalibrationBinarySize];
u8 g_calibration_binary_file_backup[CalibrationBinarySize];
FsFile g_calibration_binary_file;
FsFile g_bis_key_file;
/* Emummc file protection. */
FsFile g_emummc_file;
void GetBackupFileName(char *dst, size_t dst_size, const char *serial_number, const char *fn) {
if (strlen(serial_number) > 0) {
std::snprintf(dst, dst_size, "automatic_backups/%s_%s", serial_number, fn);
} else {
std::snprintf(dst, dst_size, "automatic_backups/%s", fn);
}
}
void CreateAutomaticBackups() {
/* Create a backup directory, if one doesn't exist. */
mitm::fs::CreateAtmosphereSdDirectory("/automatic_backups");
/* Read the calibration binary. */
{
FsStorage calibration_binary_storage;
R_ASSERT(fsOpenBisStorage(&calibration_binary_storage, FsBisPartitionId_CalibrationBinary));
ON_SCOPE_EXIT { fsStorageClose(&calibration_binary_storage); };
R_ASSERT(fsStorageRead(&calibration_binary_storage, 0, g_calibration_binary_storage_backup, CalibrationBinarySize));
}
/* Copy serial number from partition. */
/* TODO: Define the magic numbers? Structs? */
char serial_number[0x40] = {};
std::memcpy(serial_number, g_calibration_binary_storage_backup + 0x250, 0x18);
/* Backup the calibration binary. */
{
char calibration_binary_backup_name[ams::fs::EntryNameLengthMax + 1];
GetBackupFileName(calibration_binary_backup_name, sizeof(calibration_binary_backup_name), serial_number, "PRODINFO.bin");
mitm::fs::CreateAtmosphereSdFile(calibration_binary_backup_name, CalibrationBinarySize, ams::fs::CreateOption_None);
R_ASSERT(mitm::fs::OpenAtmosphereSdFile(&g_calibration_binary_file, calibration_binary_backup_name, ams::fs::OpenMode_ReadWrite));
s64 file_size = 0;
R_ASSERT(fsFileGetSize(&g_calibration_binary_file, &file_size));
bool is_file_backup_valid = file_size == CalibrationBinarySize;
if (is_file_backup_valid) {
u64 read_size = 0;
R_ASSERT(fsFileRead(&g_calibration_binary_file, 0, g_calibration_binary_file_backup, CalibrationBinarySize, FsReadOption_None, &read_size));
AMS_ASSERT(read_size == CalibrationBinarySize);
is_file_backup_valid &= std::memcmp(g_calibration_binary_file_backup, "CAL0", 4) == 0;
is_file_backup_valid &= std::memcmp(g_calibration_binary_file_backup + 0x250, serial_number, 0x18) == 0;
const u32 cal_bin_size = *reinterpret_cast<const u32 *>(g_calibration_binary_file_backup + 0x8);
is_file_backup_valid &= cal_bin_size + 0x40 <= CalibrationBinarySize;
if (is_file_backup_valid) {
u8 calc_hash[SHA256_HASH_SIZE];
/* TODO: ams::crypto? */
sha256CalculateHash(calc_hash, g_calibration_binary_file_backup + 0x40, cal_bin_size);
is_file_backup_valid &= std::memcmp(calc_hash, g_calibration_binary_file_backup + 0x20, sizeof(calc_hash)) == 0;
}
}
if (!is_file_backup_valid) {
R_ASSERT(fsFileSetSize(&g_calibration_binary_file, CalibrationBinarySize));
R_ASSERT(fsFileWrite(&g_calibration_binary_file, 0, g_calibration_binary_storage_backup, CalibrationBinarySize, FsWriteOption_Flush));
}
/* Note: g_calibration_binary_file is intentionally not closed here. This prevents any other process from opening it. */
std::memset(g_calibration_binary_file_backup, 0, CalibrationBinarySize);
std::memset(g_calibration_binary_storage_backup, 0, CalibrationBinarySize);
}
/* Backup BIS keys. */
{
u64 key_generation = 0;
if (hos::GetVersion() >= hos::Version_500) {
R_ASSERT(splGetConfig(SplConfigItem_NewKeyGeneration, &key_generation));
}
u8 bis_keys[4][2][0x10];
std::memset(bis_keys, 0xCC, sizeof(bis_keys));
/* TODO: Clean this up. */
for (size_t partition = 0; partition < 4; partition++) {
if (partition == 0) {
for (size_t i = 0; i < 2; i++) {
R_ASSERT(splFsGenerateSpecificAesKey(BisKeySources[partition][i], key_generation, i, bis_keys[partition][i]));
}
} else {
const u32 option = (partition == 3 && spl::IsRecoveryBoot()) ? 0x4 : 0x1;
u8 access_key[0x10];
R_ASSERT(splCryptoGenerateAesKek(BisKekSource, key_generation, option, access_key));
for (size_t i = 0; i < 2; i++) {
R_ASSERT(splCryptoGenerateAesKey(access_key, BisKeySources[partition][i], bis_keys[partition][i]));
}
}
}
char bis_keys_backup_name[ams::fs::EntryNameLengthMax + 1];
GetBackupFileName(bis_keys_backup_name, sizeof(bis_keys_backup_name), serial_number, "BISKEYS.bin");
mitm::fs::CreateAtmosphereSdFile(bis_keys_backup_name, sizeof(bis_keys), ams::fs::CreateOption_None);
R_ASSERT(mitm::fs::OpenAtmosphereSdFile(&g_bis_key_file, bis_keys_backup_name, ams::fs::OpenMode_ReadWrite));
R_ASSERT(fsFileSetSize(&g_bis_key_file, sizeof(bis_keys)));
R_ASSERT(fsFileWrite(&g_bis_key_file, 0, bis_keys, sizeof(bis_keys), FsWriteOption_Flush));
/* NOTE: g_bis_key_file is intentionally not closed here. This prevents any other process from opening it. */
}
}
/* Initialization implementation */
void InitializeThreadFunc(void *arg) {
/* Wait for the SD card to be ready. */
@ -43,7 +179,22 @@ namespace ams::mitm {
/* Discard result, since it doesn't need to succeed. */
mitm::bpc::LoadRebootPayload();
/* TODO: Other initialization tasks. */
/* Backup Calibration Binary and BIS keys. */
CreateAutomaticBackups();
/* If we're emummc, persist a write-handle to prevent other processes from touching the image. */
if (emummc::IsActive()) {
if (const char *emummc_file_path = emummc::GetFilePath(); emummc_file_path != nullptr) {
char emummc_path[ams::fs::EntryNameLengthMax + 1];
std::snprintf(emummc_path, sizeof(emummc_path), "%s/eMMC", emummc_file_path);
mitm::fs::OpenSdFile(&g_emummc_file, emummc_path, ams::fs::OpenMode_Read);
}
}
/* Connect to set:sys. */
sm::DoWithSession([]() {
R_ASSERT(setsysInitialize());
});
/* Signal to waiters that we are ready. */
g_init_event.Signal();

1
stratosphere/libstratosphere/include/stratosphere/fs/fs_filesystem.hpp
View file

@ -43,6 +43,7 @@ namespace ams::fs {
};
enum CreateOption {
CreateOption_None = 0,
CreateOption_BigFile = ::FsCreateOption_BigFile,
};