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ams: replace sept with tsec firmware (#1594)

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* ams: replace sept with tsec firmware

This replaces sept with a custom tsec key derivation firmware.

NOTE: This does not use any TSEC exploits whatsoever; it is a well-signed
TSEC binary assembled with envyas and signed with the real cauth key.

For more details, contact SciresM#0524.

* fusee: only set SBK if it's readable
This commit is contained in:
SciresM
2021-08-20 13:13:29 -07:00
committed by GitHub
parent f175802136
commit 17ca463c3f
137 changed files with 149 additions and 28364 deletions
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188
fusee/fusee-secondary/src/key_derivation.c
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@@ -26,19 +26,6 @@
#define AL16 ALIGN(16)
static const uint8_t AL16 keyblob_seeds[MASTERKEY_REVISION_MAX][0x10] = {
{0xDF, 0x20, 0x6F, 0x59, 0x44, 0x54, 0xEF, 0xDC, 0x70, 0x74, 0x48, 0x3B, 0x0D, 0xED, 0x9F, 0xD3}, /* Keyblob seed 00. */
{0x0C, 0x25, 0x61, 0x5D, 0x68, 0x4C, 0xEB, 0x42, 0x1C, 0x23, 0x79, 0xEA, 0x82, 0x25, 0x12, 0xAC}, /* Keyblob seed 01. */
{0x33, 0x76, 0x85, 0xEE, 0x88, 0x4A, 0xAE, 0x0A, 0xC2, 0x8A, 0xFD, 0x7D, 0x63, 0xC0, 0x43, 0x3B}, /* Keyblob seed 02. */
{0x2D, 0x1F, 0x48, 0x80, 0xED, 0xEC, 0xED, 0x3E, 0x3C, 0xF2, 0x48, 0xB5, 0x65, 0x7D, 0xF7, 0xBE}, /* Keyblob seed 03. */
{0xBB, 0x5A, 0x01, 0xF9, 0x88, 0xAF, 0xF5, 0xFC, 0x6C, 0xFF, 0x07, 0x9E, 0x13, 0x3C, 0x39, 0x80}, /* Keyblob seed 04. */
{0xD8, 0xCC, 0xE1, 0x26, 0x6A, 0x35, 0x3F, 0xCC, 0x20, 0xF3, 0x2D, 0x3B, 0x51, 0x7D, 0xE9, 0xC0} /* Keyblob seed 05. */
};
static const uint8_t AL16 keyblob_mac_seed[0x10] = {
0x59, 0xC7, 0xFB, 0x6F, 0xBE, 0x9B, 0xBE, 0x87, 0x65, 0x6B, 0x15, 0xC0, 0x53, 0x73, 0x36, 0xA5
};
static const uint8_t AL16 masterkey_seed[0x10] = {
0xD8, 0xA2, 0x41, 0x0A, 0xC6, 0xC5, 0x90, 0x01, 0xC6, 0x1D, 0x6A, 0x26, 0x7C, 0x51, 0x3F, 0x3C
};
@@ -55,164 +42,51 @@ static const uint8_t AL16 masterkey_4x_seed[0x10] = {
0x2D, 0xC1, 0xF4, 0x8D, 0xF3, 0x5B, 0x69, 0x33, 0x42, 0x10, 0xAC, 0x65, 0xDA, 0x90, 0x46, 0x66
};
/* TODO: Bother adding 8.1.0 here? We'll never call into here... */
static const uint8_t AL16 new_master_kek_seeds[MASTERKEY_REVISION_700_800 - MASTERKEY_REVISION_600_610][0x10] = {
{0x37, 0x4B, 0x77, 0x29, 0x59, 0xB4, 0x04, 0x30, 0x81, 0xF6, 0xE5, 0x8C, 0x6D, 0x36, 0x17, 0x9A}, /* MasterKek seed 06. */
{0x9A, 0x3E, 0xA9, 0xAB, 0xFD, 0x56, 0x46, 0x1C, 0x9B, 0xF6, 0x48, 0x7F, 0x5C, 0xFA, 0x09, 0x5C}, /* MasterKek seed 07. */
static const uint8_t AL16 keyblob_seed_00[0x10] = {
0xDF, 0x20, 0x6F, 0x59, 0x44, 0x54, 0xEF, 0xDC, 0x70, 0x74, 0x48, 0x3B, 0x0D, 0xED, 0x9F, 0xD3
};
static const uint8_t AL16 master_kek_seed_erista[0x10] = { /* TODO: Update on next change of keys. */
0x84, 0x67, 0xB6, 0x7F, 0x13, 0x11, 0xAE, 0xE6, 0x58, 0x9B, 0x19, 0xAF, 0x13, 0x6C, 0x80, 0x7A /* Erista MasterKek seed 0B. */
};
static const uint8_t AL16 master_devkey_seed_erista[0x10] = {
0xAA, 0xFD, 0xBC, 0xBB, 0x25, 0xC3, 0xA4, 0xEF, 0xE3, 0xEE, 0x58, 0x53, 0xB7, 0xF8, 0xDD, 0xD6
};
static const uint8_t AL16 master_kek_seed_mariko[0x10] = { /* TODO: Update on next change of keys. */
0xE5, 0x41, 0xAC, 0xEC, 0xD1, 0xA7, 0xD1, 0xAB, 0xED, 0x03, 0x77, 0xF1, 0x27, 0xCA, 0xF8, 0xF1, /* Mariko MasterKek seed 0B. */
};
static nx_dec_keyblob_t AL16 g_dec_keyblobs[32];
static int get_keyblob(nx_keyblob_t *dst, uint32_t revision, const nx_keyblob_t *keyblobs, uint32_t available_revision) {
if (revision >= 0x20) {
return -1;
/* TODO: what should we do? */
}
if (keyblobs != NULL) {
*dst = keyblobs[revision];
} else {
return -1;
/* TODO: what should we do? */
}
return 0;
}
static bool safe_memcmp(uint8_t *a, uint8_t *b, size_t sz) {
uint8_t different = 0;
for (unsigned int i = 0; i < sz; i++) {
different |= a[i] ^ b[i];
}
return different != 0;
}
static int decrypt_keyblob(const nx_keyblob_t *keyblobs, uint32_t revision, uint32_t available_revision) {
nx_keyblob_t AL16 keyblob;
uint8_t AL16 work_buffer[0x10];
unsigned int keyslot = revision == MASTERKEY_REVISION_100_230 ? 0xF : KEYSLOT_SWITCH_TEMPKEY;
if (get_keyblob(&keyblob, revision, keyblobs, available_revision) != 0) {
return -1;
}
se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, keyblob_seeds[revision], 0x10);
decrypt_data_into_keyslot(keyslot, 0xE, work_buffer, 0x10);
decrypt_data_into_keyslot(0xB, keyslot, keyblob_mac_seed, 0x10);
/* Validate keyblob. */
se_compute_aes_128_cmac(0xB, work_buffer, 0x10, keyblob.mac + sizeof(keyblob.mac), sizeof(keyblob) - sizeof(keyblob.mac));
if (safe_memcmp(keyblob.mac, work_buffer, 0x10)) {
return -1;
}
/* Decrypt keyblob. */
se_aes_ctr_crypt(keyslot, &g_dec_keyblobs[revision], sizeof(g_dec_keyblobs[revision]), keyblob.data, sizeof(keyblob.data), keyblob.ctr, sizeof(keyblob.ctr));
return 0;
}
int load_package1_key(uint32_t revision) {
if (revision > MASTERKEY_REVISION_600_610) {
return -1;
}
set_aes_keyslot(0xB, g_dec_keyblobs[revision].package1_key, 0x10);
return 0;
}
/* Derive all Switch keys. */
int derive_nx_keydata_erista(uint32_t target_firmware, const nx_keyblob_t *keyblobs, uint32_t available_revision, const void *tsec_key, void *tsec_root_keys, unsigned int *out_keygen_type) {
int derive_nx_keydata_erista(uint32_t target_firmware) {
uint8_t AL16 work_buffer[0x10];
uint8_t AL16 zeroes[0x10] = {0};
/* Initialize keygen type. */
*out_keygen_type = 0;
/* Get whether we're using dev keys. */
const bool is_retail = fuse_get_hardware_state() != 0;
/* TODO: Set keyslot flags properly in preparation of derivation. */
set_aes_keyslot_flags(0xE, 0x15);
set_aes_keyslot_flags(0xD, 0x15);
/* Derive Keyblob Key 00. */
se_aes_ecb_decrypt_block(0xC, work_buffer, 0x10, keyblob_seed_00, 0x10);
decrypt_data_into_keyslot(0xF, 0xE, work_buffer, 0x10);
/* Set the TSEC key. */
set_aes_keyslot(0xD, tsec_key, 0x10);
/* Derive master kek. */
decrypt_data_into_keyslot(0xE, is_retail ? 0xD : 0xB, master_kek_seed_erista, 0x10);
/* Decrypt all keyblobs, setting keyslot 0xF correctly. */
for (unsigned int rev = 0; rev <= MASTERKEY_REVISION_600_610; rev++) {
int ret = decrypt_keyblob(keyblobs, rev, available_revision);
if (ret) {
return ret;
}
}
/* Derive master key, device master key. */
decrypt_data_into_keyslot(0xD, 0xE, masterkey_seed, 0x10);
decrypt_data_into_keyslot(0xE, 0xE, masterkey_4x_seed, 0x10);
/* Do 6.2.0+ keygen. */
if (target_firmware >= ATMOSPHERE_TARGET_FIRMWARE_6_2_0) {
uint32_t desired_keyblob;
if (target_firmware >= ATMOSPHERE_TARGET_FIRMWARE_8_1_0) {
/* NOTE: We load in the current key for all >= 8.1.0 firmwares to reduce sept binaries. */
desired_keyblob = MASTERKEY_REVISION_C10_CURRENT;
} else if (target_firmware >= ATMOSPHERE_TARGET_FIRMWARE_7_0_0) {
desired_keyblob = MASTERKEY_REVISION_700_800;
} else {
desired_keyblob = MASTERKEY_REVISION_620;
}
/* Try emulation result. */
for (unsigned int rev = MASTERKEY_REVISION_620; rev < MASTERKEY_REVISION_MAX; rev++) {
void *tsec_root_key = (void *)((uintptr_t)tsec_root_keys + 0x10 * (rev - MASTERKEY_REVISION_620));
if (memcmp(tsec_root_key, zeroes, 0x10) != 0) {
/* We got a valid key from emulation. */
set_aes_keyslot(0xD, tsec_root_key, 0x10);
se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, new_master_kek_seeds[rev - MASTERKEY_REVISION_620], 0x10);
memcpy(g_dec_keyblobs[rev].master_kek, work_buffer, 0x10);
}
}
if (memcmp(g_dec_keyblobs[desired_keyblob].master_kek, zeroes, 0x10) == 0) {
/* Try reading the keys from a file. */
const char *keyfile = fuse_get_hardware_state() != 0 ? "atmosphere/prod.keys" : "atmosphere/dev.keys";
FILE *extkey_file = fopen(keyfile, "r");
AL16 fusee_extkeys_t extkeys = {0};
if (extkey_file == NULL) {
fatal_error("Error: failed to read %s, needed for 6.2.0+ key derivation!", keyfile);
}
extkeys_initialize_keyset(&extkeys, extkey_file);
fclose(extkey_file);
for (unsigned int rev = MASTERKEY_REVISION_620; rev < MASTERKEY_REVISION_MAX; rev++) {
if (memcmp(extkeys.tsec_root_keys[rev - MASTERKEY_REVISION_620], zeroes, 0x10) != 0) {
set_aes_keyslot(0xD, extkeys.tsec_root_keys[rev - MASTERKEY_REVISION_620], 0x10);
se_aes_ecb_decrypt_block(0xD, work_buffer, 0x10, new_master_kek_seeds[rev - MASTERKEY_REVISION_620], 0x10);
memcpy(g_dec_keyblobs[rev].master_kek, work_buffer, 0x10);
} else {
memcpy(g_dec_keyblobs[rev].master_kek, extkeys.master_keks[rev], 0x10);
}
}
}
if (memcmp(g_dec_keyblobs[available_revision].master_kek, zeroes, 0x10) == 0) {
fatal_error("Error: failed to derive master_kek_%02x!", available_revision);
}
}
/* Clear the SBK. */
clear_aes_keyslot(0xE);
/* Get needed data. */
set_aes_keyslot(0xD, g_dec_keyblobs[available_revision].master_kek, 0x10);
/* Also set the Package1 key for the revision that is stored on the eMMC boot0 partition. */
if (target_firmware < ATMOSPHERE_TARGET_FIRMWARE_6_2_0) {
load_package1_key(available_revision);
}
/* Derive keys for Exosphere, lock critical keyslots. */
/* Derive device keys. */
decrypt_data_into_keyslot(0xA, 0xF, devicekey_4x_seed, 0x10);
decrypt_data_into_keyslot(0xF, 0xF, devicekey_seed, 0x10);
decrypt_data_into_keyslot(0xC, 0xD, masterkey_4x_seed, 0x10);
decrypt_data_into_keyslot(0xD, 0xD, masterkey_seed, 0x10);
decrypt_data_into_keyslot(0xF, 0xF, devicekey_seed, 0x10);
/* Derive firmware specific device key. */
se_aes_ecb_decrypt_block(0xA, work_buffer, 0x10, master_devkey_seed_erista, 0x10);
decrypt_data_into_keyslot(0xC, 0xE, work_buffer, 0x10);
/* Clear keyslots 0xB/0xE. */
clear_aes_keyslot(0xB);
clear_aes_keyslot(0xE);
/* Setup master key revision, derive older master keys for use. */
return mkey_detect_revision(fuse_get_hardware_state() != 0);