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autobackup: dump bis keys (closes #583).

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This commit is contained in:
Michael Scire 2019-08-05 19:34:59 -07:00
parent 215f1bc8ee
commit 362ee3cdb0
3 changed files with 94 additions and 28 deletions
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4
stratosphere/ams_mitm/source/amsmitm_main.cpp
View file

@ -76,6 +76,7 @@ void __appInit(void) {
R_ASSERT(fsInitialize());
R_ASSERT(pmdmntInitialize());
R_ASSERT(pminfoInitialize());
R_ASSERT(splFsInitialize());
});
CheckAtmosphereVersion(CURRENT_ATMOSPHERE_VERSION);
@ -83,6 +84,9 @@ void __appInit(void) {
void __appExit(void) {
/* Cleanup services. */
splFsExit();
pminfoExit();
pmdmntExit();
fsExit();
}

116
stratosphere/ams_mitm/source/utils.cpp
View file

@ -16,6 +16,7 @@
#include <switch.h>
#include <stratosphere.hpp>
#include <stratosphere/spl.hpp>
#include <atomic>
#include <algorithm>
#include <strings.h>
@ -61,7 +62,8 @@ static char g_config_ini_data[0x800];
/* Backup file for CAL0 partition. */
static constexpr size_t ProdinfoSize = 0x8000;
static FsFile g_cal0_file = {0};
static FsFile g_cal0_file = {};
static FsFile g_bis_key_file = {};
static u8 g_cal0_storage_backup[ProdinfoSize];
static u8 g_cal0_backup[ProdinfoSize];
@ -106,40 +108,100 @@ void Utils::InitializeThreadFunc(void *args) {
char serial_number[0x40] = {0};
memcpy(serial_number, g_cal0_storage_backup + 0x250, 0x18);
/* Automatically backup PRODINFO. */
{
char prodinfo_backup_path[FS_MAX_PATH] = {0};
if (strlen(serial_number) > 0) {
snprintf(prodinfo_backup_path, sizeof(prodinfo_backup_path) - 1, "/atmosphere/automatic_backups/%s_PRODINFO.bin", serial_number);
} else {
snprintf(prodinfo_backup_path, sizeof(prodinfo_backup_path) - 1, "/atmosphere/automatic_backups/PRODINFO.bin");
}
char prodinfo_backup_path[FS_MAX_PATH] = {0};
if (strlen(serial_number) > 0) {
snprintf(prodinfo_backup_path, sizeof(prodinfo_backup_path) - 1, "/atmosphere/automatic_backups/%s_PRODINFO.bin", serial_number);
} else {
snprintf(prodinfo_backup_path, sizeof(prodinfo_backup_path) - 1, "/atmosphere/automatic_backups/PRODINFO.bin");
fsFsCreateFile(&g_sd_filesystem, prodinfo_backup_path, ProdinfoSize, 0);
if (R_SUCCEEDED(fsFsOpenFile(&g_sd_filesystem, prodinfo_backup_path, FS_OPEN_READ | FS_OPEN_WRITE, &g_cal0_file))) {
bool has_auto_backup = false;
size_t read = 0;
if (R_SUCCEEDED(fsFileRead(&g_cal0_file, 0, g_cal0_backup, sizeof(g_cal0_backup), FS_READOPTION_NONE, &read)) && read == sizeof(g_cal0_backup)) {
bool is_cal0_valid = true;
is_cal0_valid &= memcmp(g_cal0_backup, "CAL0", 4) == 0;
is_cal0_valid &= memcmp(g_cal0_backup + 0x250, serial_number, 0x18) == 0;
u32 cal0_size = ((u32 *)g_cal0_backup)[2];
is_cal0_valid &= cal0_size + 0x40 <= ProdinfoSize;
if (is_cal0_valid) {
u8 calc_hash[0x20];
sha256CalculateHash(calc_hash, g_cal0_backup + 0x40, cal0_size);
is_cal0_valid &= memcmp(calc_hash, g_cal0_backup + 0x20, sizeof(calc_hash)) == 0;
}
has_auto_backup = is_cal0_valid;
}
if (!has_auto_backup) {
fsFileSetSize(&g_cal0_file, ProdinfoSize);
fsFileWrite(&g_cal0_file, 0, g_cal0_storage_backup, ProdinfoSize, FS_WRITEOPTION_FLUSH);
}
/* NOTE: g_cal0_file is intentionally not closed here. This prevents any other process from opening it. */
memset(g_cal0_storage_backup, 0, sizeof(g_cal0_storage_backup));
memset(g_cal0_backup, 0, sizeof(g_cal0_backup));
}
}
fsFsCreateFile(&g_sd_filesystem, prodinfo_backup_path, ProdinfoSize, 0);
if (R_SUCCEEDED(fsFsOpenFile(&g_sd_filesystem, prodinfo_backup_path, FS_OPEN_READ | FS_OPEN_WRITE, &g_cal0_file))) {
bool has_auto_backup = false;
size_t read = 0;
if (R_SUCCEEDED(fsFileRead(&g_cal0_file, 0, g_cal0_backup, sizeof(g_cal0_backup), FS_READOPTION_NONE, &read)) && read == sizeof(g_cal0_backup)) {
bool is_cal0_valid = true;
is_cal0_valid &= memcmp(g_cal0_backup, "CAL0", 4) == 0;
is_cal0_valid &= memcmp(g_cal0_backup + 0x250, serial_number, 0x18) == 0;
u32 cal0_size = ((u32 *)g_cal0_backup)[2];
is_cal0_valid &= cal0_size + 0x40 <= ProdinfoSize;
if (is_cal0_valid) {
u8 calc_hash[0x20];
sha256CalculateHash(calc_hash, g_cal0_backup + 0x40, cal0_size);
is_cal0_valid &= memcmp(calc_hash, g_cal0_backup + 0x20, sizeof(calc_hash)) == 0;
/* Automatically backup BIS keys. */
{
static constexpr u8 const 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}
}
};
u8 bis_keys[4][2][0x10] = {};
/* TODO: Clean this up in ams_mitm refactor. */
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], 0, i, bis_keys[partition][i]));
}
} else {
static constexpr u8 const BisKekSource[0x10] = {
0x34, 0xC1, 0xA0, 0xC4, 0x82, 0x58, 0xF8, 0xB4, 0xFA, 0x9E, 0x5E, 0x6A, 0xDA, 0xFC, 0x7E, 0x4F,
};
const u32 option = (partition == 3 && sts::spl::IsRecoveryBoot()) ? 0x4 : 0x1;
u8 access_key[0x10];
R_ASSERT(splCryptoGenerateAesKek(BisKekSource, 0, option, access_key));
for (size_t i = 0; i < 2; i++) {
R_ASSERT(splCryptoGenerateAesKey(access_key, BisKeySources[partition][i], bis_keys[partition][i]));
}
}
has_auto_backup = is_cal0_valid;
}
if (!has_auto_backup) {
fsFileSetSize(&g_cal0_file, ProdinfoSize);
fsFileWrite(&g_cal0_file, 0, g_cal0_storage_backup, ProdinfoSize, FS_WRITEOPTION_FLUSH);
char bis_key_backup_path[FS_MAX_PATH] = {0};
if (strlen(serial_number) > 0) {
snprintf(bis_key_backup_path, sizeof(bis_key_backup_path) - 1, "/atmosphere/automatic_backups/%s_BISKEYS.bin", serial_number);
} else {
snprintf(bis_key_backup_path, sizeof(bis_key_backup_path) - 1, "/atmosphere/automatic_backups/BISKEYS.bin");
}
/* NOTE: g_cal0_file is intentionally not closed here. This prevents any other process from opening it. */
memset(g_cal0_storage_backup, 0, sizeof(g_cal0_storage_backup));
memset(g_cal0_backup, 0, sizeof(g_cal0_backup));
fsFsCreateFile(&g_sd_filesystem, bis_key_backup_path, sizeof(bis_keys), 0);
if (R_SUCCEEDED(fsFsOpenFile(&g_sd_filesystem, bis_key_backup_path, FS_OPEN_READ | FS_OPEN_WRITE, &g_bis_key_file))) {
fsFileSetSize(&g_bis_key_file, sizeof(bis_keys));
fsFileWrite(&g_bis_key_file, 0, bis_keys, sizeof(bis_keys), FS_WRITEOPTION_FLUSH);
/* NOTE: g_bis_key_file is intentionally not closed here. This prevents any other process from opening it. */
}
}
}

2
stratosphere/spl/source/spl_main.cpp
View file

@ -104,7 +104,7 @@ int main(int argc, char **argv)
s_server_manager.AddWaitable(new ServiceServer<sts::spl::CryptoService>("spl:mig", 6));
s_server_manager.AddWaitable(new ServiceServer<sts::spl::SslService>("spl:ssl", 2));
s_server_manager.AddWaitable(new ServiceServer<sts::spl::EsService>("spl:es", 2));
s_server_manager.AddWaitable(new ServiceServer<sts::spl::FsService>("spl:fs", 2));
s_server_manager.AddWaitable(new ServiceServer<sts::spl::FsService>("spl:fs", 3));
if (GetRuntimeFirmwareVersion() >= FirmwareVersion_500) {
s_server_manager.AddWaitable(new ServiceServer<sts::spl::ManuService>("spl:manu", 1));
}