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keys: Dump partials for Mariko keyslot bruteforce

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This commit is contained in:
shchmue 2020-12-10 18:05:36 -07:00
parent b7495bd575
commit 89ef341621
3 changed files with 49 additions and 11 deletions
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6
bdk/sec/se.c
View file

@ -285,6 +285,12 @@ void se_aes_key_set(u32 ks, const void *key, u32 size)
}
}
void se_aes_key_partial_set(u32 ks, u32 index, u32 data)
{
SE(SE_KEYTABLE_REG_OFFSET) = SE_KEYTABLE_SLOT(ks) | index;
SE(SE_KEYTABLE_DATA0_REG_OFFSET) = data;
}
void se_aes_iv_set(u32 ks, const void *iv)
{
u32 data[TEGRA_SE_AES_BLOCK_SIZE / 4];

1
bdk/sec/se.h
View file

@ -27,6 +27,7 @@ void se_key_acc_ctrl(u32 ks, u32 flags);
u32 se_key_acc_ctrl_get(u32 ks);
void se_aes_key_set(u32 ks, const void *key, u32 size);
void se_aes_iv_set(u32 ks, const void *iv);
void se_aes_key_partial_set(u32 ks, u32 index, u32 data);
void se_aes_key_get(u32 ks, void *key, u32 size);
void se_aes_key_clear(u32 ks);
void se_aes_iv_clear(u32 ks);

53
source/keys/keys.c
View file

@ -93,8 +93,6 @@ static ALWAYS_INLINE u32 _get_tsec_fw_size(tsec_key_data_t *key_data) {
return key_data->blob0_size + sizeof(tsec_key_data_t) + key_data->blob1_size + key_data->blob2_size + key_data->blob3_size + key_data->blob4_size;
}
#define RELOC_META_OFF 0x7C
static u8 *_read_pkg1(sdmmc_t *sdmmc, const pkg1_id_t **pkg1_id) {
if (emummc_storage_init_mmc(&emmc_storage, sdmmc)) {
EPRINTF("Unable to init MMC.");
@ -124,6 +122,8 @@ static u8 *_read_pkg1(sdmmc_t *sdmmc, const pkg1_id_t **pkg1_id) {
return pkg1;
}
#define RELOC_META_OFF 0x7C
static bool _handle_sept(void *tsec_fw, u32 tsec_size, u32 kb, void *out_key) {
sd_mount();
if (!f_stat("sd:/sept/payload.bak", NULL)) {
@ -163,10 +163,7 @@ static bool _handle_sept(void *tsec_fw, u32 tsec_size, u32 kb, void *out_key) {
}
gfx_printf(" done");
f_close(&fp);
gfx_printf("%k\nFirmware 7.x or higher detected.\n\n", colors[(color_idx++) % 6]);
gfx_printf("%kRenamed /sept/payload.bin", colors[(color_idx++) % 6]);
gfx_printf("\n to /sept/payload.bak\n\n");
gfx_printf("%kCopied self to /sept/payload.bin\n", colors[(color_idx++) % 6]);
gfx_printf("%k\nRebooting to sept...\n\n", colors[(color_idx++) % 6]);
sdmmc_storage_end(&emmc_storage);
if (!reboot_to_sept((u8 *)tsec_fw, tsec_size, kb)) {
return false;
@ -286,7 +283,6 @@ static void _derive_master_keys_from_keyblobs(key_derivation_ctx_t *keys) {
}
se_aes_key_set(8, keys->tsec_keys, sizeof(keys->tsec_keys) / 2);
se_aes_key_set(9, keys->sbk, sizeof(keys->sbk));
if (!emummc_storage_read(&emmc_storage, KEYBLOB_OFFSET / NX_EMMC_BLOCKSIZE, KB_FIRMWARE_VERSION_600 + 1, keyblob_block)) {
EPRINTF("Unable to read keyblobs.");
@ -295,7 +291,7 @@ static void _derive_master_keys_from_keyblobs(key_derivation_ctx_t *keys) {
for (u32 i = 0; i <= KB_FIRMWARE_VERSION_600; i++, current_keyblob++) {
minerva_periodic_training();
se_aes_crypt_block_ecb(8, 0, keys->keyblob_key[i], keyblob_key_source[i]); // temp = unwrap(kbks, tsec)
se_aes_crypt_block_ecb(9, 0, keys->keyblob_key[i], keys->keyblob_key[i]); // kbk = unwrap(temp, sbk)
se_aes_crypt_block_ecb(14, 0, keys->keyblob_key[i], keys->keyblob_key[i]); // kbk = unwrap(temp, sbk)
se_aes_key_set(7, keys->keyblob_key[i], sizeof(keys->keyblob_key[i]));
se_aes_crypt_block_ecb(7, 0, keys->keyblob_mac_key[i], keyblob_mac_key_source); // kbm = unwrap(kbms, kbk)
if (i == 0) {
@ -429,8 +425,8 @@ static bool _get_titlekeys_from_save(u32 buf_size, const u8 *save_mac_key, title
return false;
}
char ticket_bin_path[32] = "/ticket.bin";
char ticket_list_bin_path[32] = "/ticket_list.bin";
const char ticket_bin_path[32] = "/ticket.bin";
const char ticket_list_bin_path[32] = "/ticket_list.bin";
save_data_file_ctx_t ticket_file;
if (!save_open_file(save_ctx, &ticket_file, ticket_list_bin_path, OPEN_MODE_READ)) {
@ -685,6 +681,35 @@ static bool _derive_emmc_keys(key_derivation_ctx_t *keys, titlekey_buffer_t *tit
return res;
}
// The security engine supports partial key override for locked keyslots
// This allows for a manageable brute force on a PC
// Then we can recover the Mariko KEK, BEK, unique SBK and SSK
static void _save_mariko_partial_keys(char *text_buffer) {
u32 pos = 0;
u32 zeros[4] = {0};
u8 *data = malloc(4 * AES_128_KEY_SIZE);
for (u32 ks = 12; ks < 16; ks++) {
// First, encrypt zeros with complete key
se_aes_crypt_block_ecb(ks, 1, &data[3 * AES_128_KEY_SIZE], zeros);
pos += sprintf(&text_buffer[pos], "%d\n", ks);
// We only need to overwrite 3 of the dwords of the key
for (u32 i = 0; i < 3; i++) {
// Overwrite ith dword of key with zeros
se_aes_key_partial_set(ks, i, 0);
// Encrypt zeros with more of the key zeroed out
se_aes_crypt_block_ecb(ks, 1, &data[(2 - i) * AES_128_KEY_SIZE], zeros);
}
for (u32 i = 0; i < 4; i++) {
for (u32 j = 0; j < AES_128_KEY_SIZE; j++)
pos += sprintf(&text_buffer[pos], "%02x", data[i * AES_128_KEY_SIZE + j]);
pos += sprintf(&text_buffer[pos], "\n");
}
}
free(data);
sd_save_to_file(text_buffer, strlen(text_buffer), "sd:/switch/partialaes.keys");
}
static void _save_keys_to_sd(key_derivation_ctx_t *keys, titlekey_buffer_t *titlekey_buffer, const pkg1_id_t *pkg1_id, u32 start_whole_operation_time, u32 derivable_key_count) {
char *text_buffer = NULL;
if (!sd_mount()) {
@ -793,6 +818,11 @@ static void _save_keys_to_sd(key_derivation_ctx_t *keys, titlekey_buffer_t *titl
} else
EPRINTF("Unable to save titlekeys to SD.");
if (h_cfg.t210b01) {
memset(text_buffer, 0, text_buffer_size);
_save_mariko_partial_keys(text_buffer);
}
free(text_buffer);
}
@ -887,11 +917,12 @@ static void _save_key(const char *name, const void *data, u32 len, char *outbuf)
}
static void _save_key_family(const char *name, const void *data, u32 start_key, u32 num_keys, u32 len, char *outbuf) {
char temp_name[0x40] = {0};
char *temp_name = calloc(1, 0x40);
for (u32 i = 0; i < num_keys; i++) {
sprintf(temp_name, "%s_%02x", name, i + start_key);
_save_key(temp_name, data + i * len, len, outbuf);
}
free(temp_name);
}
static void _generate_kek(u32 ks, const void *key_source, void *master_key, const void *kek_seed, const void *key_seed) {