Atmosphere/fusee/fusee-secondary/src/package1.c

149 lines
4.8 KiB
C

/*
* Copyright (c) 2018 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdlib.h>
#include <malloc.h>
#include <string.h>
#include "package1.h"
#include "bct.h"
#include "se.h"
int package1_read_and_parse_boot0(void **package1loader, size_t *package1loader_size, nx_keyblob_t *keyblobs, uint32_t *revision, FILE *boot0) {
nvboot_config_table *bct; /* Normal firmware BCT, primary. TODO: check? */
nv_bootloader_info *pk1l_info; /* TODO: check? */
size_t fpos, pk1l_offset;
union {
nx_keyblob_t keyblob;
uint8_t sector[0x200];
} d;
if (package1loader == NULL || package1loader_size == NULL || keyblobs == NULL || revision == NULL || boot0 == NULL) {
errno = EINVAL;
return -1;
}
bct = malloc(sizeof(nvboot_config_table));
if (bct == NULL) {
errno = ENOMEM;
return -1;
}
pk1l_info = &bct->bootloader[0];
fpos = ftell(boot0);
/* Read the BCT. */
if (fread(bct, sizeof(nvboot_config_table), 1, boot0) == 0) {
free(bct);
return -1;
}
if (bct->bootloader_used < 1 || pk1l_info->version < 1) {
free(bct);
errno = EILSEQ;
return -1;
}
*revision = pk1l_info->version - 1;
*package1loader_size = pk1l_info->length;
pk1l_offset = 0x4000 * pk1l_info->start_blk + 0x200 * pk1l_info->start_page;
free(bct);
(*package1loader) = memalign(0x10000, *package1loader_size);
if (*package1loader == NULL) {
errno = ENOMEM;
return -1;
}
/* Read the pk1/pk1l, and skip the backup too. */
if (fseek(boot0, fpos + pk1l_offset, SEEK_SET) != 0) {
return -1;
}
if (fread(*package1loader, *package1loader_size, 1, boot0) == 0) {
return -1;
}
if (fseek(boot0, fpos + pk1l_offset + 2 * PACKAGE1LOADER_SIZE_MAX, SEEK_SET) != 0) {
return -1;
}
/* Read the full keyblob area.*/
for (size_t i = 0; i < 32; i++) {
if (!fread(d.sector, 0x200, 1, boot0)) {
return -1;
}
keyblobs[i] = d.keyblob;
}
return 0;
}
size_t package1_get_tsec_fw(void **tsec_fw, const void *package1loader, size_t package1loader_size) {
/* The TSEC firmware is always located at a 256-byte aligned address. */
/* We're looking for its 4 first bytes. We assume its size is always 0xF00 bytes. */
const uint32_t *pos;
uintptr_t pk1l = (uintptr_t)package1loader;
for (pos = (const uint32_t *)pk1l; (uintptr_t)pos < pk1l + package1loader_size && *pos != 0xCF42004D; pos += 0x40);
(*tsec_fw) = (void *)pos;
return 0xF00;
}
size_t package1_get_encrypted_package1(package1_header_t **package1, uint8_t *ctr, const void *package1loader, size_t package1loader_size) {
const uint8_t *crypt_hdr = (const uint8_t *)package1loader + 0x4000 - 0x20;
if (package1loader_size < 0x4000) {
return 0; /* Shouldn't happen, ever. */
}
memcpy(ctr, crypt_hdr + 0x10, 0x10);
(*package1) = (package1_header_t *)(crypt_hdr + 0x20);
return *(uint32_t *)crypt_hdr;
}
bool package1_decrypt(package1_header_t *package1, size_t package1_size, const uint8_t *ctr) {
uint8_t __attribute__((aligned(16))) ctrbuf[16];
memcpy(ctrbuf, ctr, 16);
se_aes_ctr_crypt(0xB, package1, package1_size, package1, package1_size, ctrbuf, 16);
return memcmp(package1->magic, "PK11", 4) == 0;
}
void *package1_get_warmboot_fw(const package1_header_t *package1) {
/*
The layout of pk1 changes between versions.
However, the secmon always starts by this erratum code:
https://github.com/ARM-software/arm-trusted-firmware/blob/master/plat/nvidia/tegra/common/aarch64/tegra_helpers.S#L312
and thus by 0xD5034FDF.
Nx-bootloader seems to always start by 0xE328F0C0 (msr cpsr_f, 0xc0).
*/
const uint32_t *data = (const uint32_t *)package1->data;
for (size_t i = 0; i < 3; i++) {
switch (*data) {
case 0xD5034FDFu:
data += package1->secmon_size / 4;
break;
case 0xE328F0C0:
data += package1->nx_bootloader_size / 4;
break;
default:
/* TODO: should we validate its signature? */
return (void *)data;
}
}
return NULL;
}