mirrors/Atmosphere
1
0
Fork 0
mirror of https://github.com/Atmosphere-NX/Atmosphere.git synced 2025-06-03 16:18:51 -04:00
Code Issues Projects Releases Packages Wiki Activity

Implement BootConfig.

Browse source
This commit is contained in:
Michael Scire 2018-02-27 20:28:34 -08:00
parent d0b74d7751
commit c5b0639b8a
6 changed files with 159 additions and 76 deletions
Download patch file Download diff file Expand all files Collapse all files

63
exosphere/src/package2.c
View file

@ -7,6 +7,7 @@
#include "package2.h"
#include "configitem.h"
#include "se.h"
#include "interrupt.h"
#include "masterkey.h"
#include "arm.h"
#include "randomcache.h"
@ -79,62 +80,6 @@ static void setup_boot_config(void) {
}
}
static bool rsa2048_pss_verify(const void *signature, size_t signature_size, const void *modulus, size_t modulus_size, const void *data, size_t data_size) {
uint8_t message[RSA_2048_BYTES];
uint8_t h_buf[0x24];
/* Hardcode RSA with keyslot 0. */
const uint8_t public_exponent[4] = {0x00, 0x01, 0x00, 0x01};
set_rsa_keyslot(0, modulus, modulus_size, public_exponent, sizeof(public_exponent));
se_synchronous_exp_mod(0, message, sizeof(message), signature, signature_size);
/* Validate sanity byte. */
if (message[RSA_2048_BYTES - 1] != 0xBC) {
return false;
}
/* Copy Salt into MGF1 Hash Buffer. */
memset(h_buf, 0, sizeof(h_buf));
memcpy(h_buf, message + RSA_2048_BYTES - 0x20 - 0x1, 0x20);
/* Decrypt maskedDB (via inline MGF1). */
uint8_t seed = 0;
uint8_t mgf1_buf[0x20];
for (unsigned int ofs = 0; ofs < RSA_2048_BYTES - 0x20 - 1; ofs += 0x20) {
h_buf[sizeof(h_buf) - 1] = seed++;
flush_dcache_range(h_buf, h_buf + sizeof(h_buf));
se_calculate_sha256(mgf1_buf, h_buf, sizeof(h_buf));
for (unsigned int i = ofs; i < ofs + 0x20 && i < RSA_2048_BYTES - 0x20 - 1; i++) {
message[i] ^= mgf1_buf[i - ofs];
}
}
/* Constant lmask for rsa-2048-pss. */
message[0] &= 0x7F;
/* Validate DB is of the form 0000...0001. */
for (unsigned int i = 0; i < RSA_2048_BYTES - 0x20 - 0x20 - 1 - 1; i++) {
if (message[i] != 0) {
return false;
}
}
if (message[RSA_2048_BYTES - 0x20 - 0x20 - 1 - 1] != 1) {
return false;
}
/* Check hash correctness. */
uint8_t validate_buf[8 + 0x20 + 0x20];
uint8_t validate_hash[0x20];
memset(validate_buf, 0, sizeof(validate_buf));
flush_dcache_range((uint8_t *)data, (uint8_t *)data + data_size);
se_calculate_sha256(&validate_buf[8], data, data_size);
memcpy(&validate_buf[0x28], &message[RSA_2048_BYTES - 0x20 - 0x20 - 1], 0x20);
flush_dcache_range(validate_buf, validate_buf + sizeof(validate_buf));
se_calculate_sha256(validate_hash, validate_buf, sizeof(validate_buf));
return memcmp(h_buf, validate_hash, 0x20) == 0;
}
static void package2_crypt_ctr(unsigned int master_key_rev, void *dst, size_t dst_size, const void *src, size_t src_size, const void *ctr, size_t ctr_size) {
/* Derive package2 key. */
const uint8_t package2_key_source[0x10] = {0xFB, 0x8B, 0x6A, 0x9C, 0x79, 0x00, 0xC8, 0x49, 0xEF, 0xD2, 0x4D, 0x85, 0x4D, 0x30, 0xA0, 0xC7};
@ -152,7 +97,7 @@ static void verify_header_signature(package2_header_t *header) {
const uint8_t *modulus;
if (configitem_is_retail()) {
const uint8_t package2_modulus_retail[0x100] = {
static const uint8_t package2_modulus_retail[0x100] = {
0x8D, 0x13, 0xA7, 0x77, 0x6A, 0xE5, 0xDC, 0xC0, 0x3B, 0x25, 0xD0, 0x58, 0xE4, 0x20, 0x69, 0x59,
0x55, 0x4B, 0xAB, 0x70, 0x40, 0x08, 0x28, 0x07, 0xA8, 0xA7, 0xFD, 0x0F, 0x31, 0x2E, 0x11, 0xFE,
0x47, 0xA0, 0xF9, 0x9D, 0xDF, 0x80, 0xDB, 0x86, 0x5A, 0x27, 0x89, 0xCD, 0x97, 0x6C, 0x85, 0xC5,
@ -172,7 +117,7 @@ static void verify_header_signature(package2_header_t *header) {
};
modulus = package2_modulus_retail;
} else {
const uint8_t package2_modulus_dev[0x100] = {
static const uint8_t package2_modulus_dev[0x100] = {
0xB3, 0x65, 0x54, 0xFB, 0x0A, 0xB0, 0x1E, 0x85, 0xA7, 0xF6, 0xCF, 0x91, 0x8E, 0xBA, 0x96, 0x99,
0x0D, 0x8B, 0x91, 0x69, 0x2A, 0xEE, 0x01, 0x20, 0x4F, 0x34, 0x5C, 0x2C, 0x4F, 0x4E, 0x37, 0xC7,
0xF1, 0x0B, 0xD4, 0xCD, 0xA1, 0x7F, 0x93, 0xF1, 0x33, 0x59, 0xCE, 0xB1, 0xE9, 0xDD, 0x26, 0xE6,
@ -194,7 +139,7 @@ static void verify_header_signature(package2_header_t *header) {
}
/* This is normally only allowed on dev units, but we'll allow it anywhere. */
if (bootconfig_is_package2_unsigned() == 0 && rsa2048_pss_verify(header->signature, 0x100, modulus, 0x100, header->encrypted_header, 0x100) == 0) {
if (bootconfig_is_package2_unsigned() == 0 && se_rsa2048_pss_verify(header->signature, 0x100, modulus, 0x100, header->encrypted_header, 0x100) == 0) {
generic_panic();
}
}