mirror of
https://github.com/liberatedsystems/RNode_Firmware_CE.git
synced 2024-10-01 03:15:40 -04:00
328 lines
10 KiB
C
328 lines
10 KiB
C
// Copyright (C) 2023, Mark Qvist
|
|
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// This program is distributed in the hope that 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 <https://www.gnu.org/licenses/>.
|
|
|
|
#include <Ed25519.h>
|
|
|
|
#if MCU_VARIANT == MCU_ESP32
|
|
#include "mbedtls/md.h"
|
|
#include "esp_ota_ops.h"
|
|
#include "esp_flash_partitions.h"
|
|
#include "esp_partition.h"
|
|
|
|
#elif MCU_VARIANT == MCU_NRF52
|
|
#include "Adafruit_nRFCrypto.h"
|
|
|
|
// size of chunk to retrieve from flash sector
|
|
#define CHUNK_SIZE 128
|
|
|
|
#define END_SECTION_SIZE 256
|
|
|
|
#if defined(NRF52840_XXAA)
|
|
// https://learn.adafruit.com/introducing-the-adafruit-nrf52840-feather/hathach-memory-map
|
|
// each section follows along from one another, in this order
|
|
// this is always at the start of the memory map
|
|
#define APPLICATION_START 0x26000
|
|
|
|
#define USER_DATA_START 0xED000
|
|
#endif
|
|
|
|
#endif
|
|
|
|
// Forward declaration from Utilities.h
|
|
void eeprom_update(int mapped_addr, uint8_t byte);
|
|
uint8_t eeprom_read(uint32_t addr);
|
|
void hard_reset(void);
|
|
|
|
#if !HAS_EEPROM && MCU_VARIANT == MCU_NRF52
|
|
void eeprom_flush();
|
|
#endif
|
|
|
|
const uint8_t dev_keys [] PROGMEM = {
|
|
0x0f, 0x15, 0x86, 0x74, 0xa0, 0x7d, 0xf2, 0xde, 0x32, 0x11, 0x29, 0xc1, 0x0d, 0xda, 0xcc, 0xc3,
|
|
0xe1, 0x9b, 0xac, 0xf2, 0x27, 0x06, 0xee, 0x89, 0x1f, 0x7a, 0xfc, 0xc3, 0x6a, 0xf5, 0x38, 0x08
|
|
};
|
|
|
|
#define DEV_SIG_LEN 64
|
|
uint8_t dev_sig[DEV_SIG_LEN];
|
|
|
|
#define DEV_KEY_LEN 32
|
|
uint8_t dev_k_prv[DEV_KEY_LEN];
|
|
uint8_t dev_k_pub[DEV_KEY_LEN];
|
|
|
|
#define DEV_HASH_LEN 32
|
|
uint8_t dev_hash[DEV_HASH_LEN];
|
|
uint8_t dev_partition_table_hash[DEV_HASH_LEN];
|
|
uint8_t dev_bootloader_hash[DEV_HASH_LEN];
|
|
uint8_t dev_firmware_hash[DEV_HASH_LEN];
|
|
uint8_t dev_firmware_hash_target[DEV_HASH_LEN];
|
|
|
|
#define EEPROM_SIG_LEN 128
|
|
uint8_t dev_eeprom_signature[EEPROM_SIG_LEN];
|
|
|
|
bool dev_signature_validated = false;
|
|
bool fw_signature_validated = true;
|
|
|
|
#define DEV_SIG_OFFSET EEPROM_SIZE-EEPROM_RESERVED-DEV_SIG_LEN
|
|
#define dev_sig_addr(a) (a+DEV_SIG_OFFSET)
|
|
|
|
#define DEV_FWHASH_OFFSET EEPROM_SIZE-EEPROM_RESERVED-DEV_SIG_LEN-DEV_HASH_LEN
|
|
#define dev_fwhash_addr(a) (a+DEV_FWHASH_OFFSET)
|
|
|
|
bool device_signatures_ok() {
|
|
return dev_signature_validated && fw_signature_validated;
|
|
}
|
|
|
|
void device_validate_signature() {
|
|
int n_keys = sizeof(dev_keys)/DEV_KEY_LEN;
|
|
bool valid_signature_found = false;
|
|
for (int i = 0; i < n_keys; i++) {
|
|
memcpy(dev_k_pub, dev_keys+DEV_KEY_LEN*i, DEV_KEY_LEN);
|
|
if (Ed25519::verify(dev_sig, dev_k_pub, dev_hash, DEV_HASH_LEN)) {
|
|
valid_signature_found = true;
|
|
}
|
|
}
|
|
|
|
if (valid_signature_found) {
|
|
dev_signature_validated = true;
|
|
} else {
|
|
dev_signature_validated = false;
|
|
}
|
|
}
|
|
|
|
void device_save_signature() {
|
|
device_validate_signature();
|
|
if (dev_signature_validated) {
|
|
for (uint8_t i = 0; i < DEV_SIG_LEN; i++) {
|
|
eeprom_update(dev_sig_addr(i), dev_sig[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
void device_load_signature() {
|
|
for (uint8_t i = 0; i < DEV_SIG_LEN; i++) {
|
|
#if HAS_EEPROM
|
|
dev_sig[i] = EEPROM.read(dev_sig_addr(i));
|
|
#elif MCU_VARIANT == MCU_NRF52
|
|
dev_sig[i] = eeprom_read(dev_sig_addr(i));
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void device_load_firmware_hash() {
|
|
for (uint8_t i = 0; i < DEV_HASH_LEN; i++) {
|
|
#if HAS_EEPROM
|
|
dev_firmware_hash_target[i] = EEPROM.read(dev_fwhash_addr(i));
|
|
#elif MCU_VARIANT == MCU_NRF52
|
|
dev_firmware_hash_target[i] = eeprom_read(dev_fwhash_addr(i));
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void device_save_firmware_hash() {
|
|
for (uint8_t i = 0; i < DEV_HASH_LEN; i++) {
|
|
eeprom_update(dev_fwhash_addr(i), dev_firmware_hash_target[i]);
|
|
}
|
|
#if !HAS_EEPROM && MCU_VARIANT == MCU_NRF52
|
|
eeprom_flush();
|
|
#endif
|
|
if (!fw_signature_validated) hard_reset();
|
|
}
|
|
|
|
#if MCU_VARIANT == MCU_NRF52
|
|
void calculate_region_hash(unsigned long long start, unsigned long long end, uint8_t* return_hash) {
|
|
// this function calculates the hash digest of a region of memory,
|
|
// currently it is only designed to work for the application region
|
|
uint8_t chunk[CHUNK_SIZE] = {0};
|
|
|
|
// to store potential last chunk of program
|
|
uint8_t chunk_next[CHUNK_SIZE] = {0};
|
|
nRFCrypto_Hash hash;
|
|
|
|
hash.begin(CRYS_HASH_SHA256_mode);
|
|
|
|
bool finish = false;
|
|
uint8_t size;
|
|
bool application = true;
|
|
int end_count = 0;
|
|
unsigned long length = 0;
|
|
|
|
while (start < end - 1 ) {
|
|
const void* src = (const void*)start;
|
|
if (start + CHUNK_SIZE >= end) {
|
|
size = (end - 1) - start;
|
|
}
|
|
else {
|
|
size = CHUNK_SIZE;
|
|
}
|
|
|
|
memcpy(chunk, src, CHUNK_SIZE);
|
|
|
|
// check if we've reached the end of the program
|
|
// if we're checking the application region
|
|
if (application) {
|
|
for (int i = 0; i < CHUNK_SIZE; i++) {
|
|
if (chunk[i] == 0xFF) {
|
|
bool matched = true;
|
|
end_count = 1;
|
|
// check if rest of chunk is FFs as well, only if FF is not
|
|
// at the end of chunk
|
|
if (i < CHUNK_SIZE - 1) {
|
|
for (int x = 0; x < CHUNK_SIZE - i; x++) {
|
|
if (chunk[i+x] != 0xFF) {
|
|
matched = false;
|
|
break;
|
|
}
|
|
end_count++;
|
|
}
|
|
}
|
|
|
|
if (matched) {
|
|
while (end_count < END_SECTION_SIZE) {
|
|
// check if bytes in next chunk up to total
|
|
// required are also FFs
|
|
for (int x = 1; x <= ceil(END_SECTION_SIZE / CHUNK_SIZE); x++) {
|
|
const void* src_next = (const void*)start + CHUNK_SIZE*x;
|
|
if ((END_SECTION_SIZE - end_count) > CHUNK_SIZE) {
|
|
size = CHUNK_SIZE;
|
|
} else {
|
|
size = END_SECTION_SIZE - end_count;
|
|
}
|
|
memcpy(chunk_next, src_next, size);
|
|
for (int y = 0; y < size; y++) {
|
|
if (chunk_next[y] != 0xFF) {
|
|
matched = false;
|
|
break;
|
|
}
|
|
end_count++;
|
|
}
|
|
|
|
if (!matched) {
|
|
break;
|
|
}
|
|
}
|
|
if (!matched) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (matched) {
|
|
finish = true;
|
|
size = i;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (finish) {
|
|
hash.update(chunk, size);
|
|
length += size;
|
|
break;
|
|
} else {
|
|
hash.update(chunk, size);
|
|
}
|
|
|
|
start += CHUNK_SIZE;
|
|
length += CHUNK_SIZE;
|
|
}
|
|
hash.end(return_hash);
|
|
}
|
|
#endif
|
|
|
|
void device_validate_partitions() {
|
|
device_load_firmware_hash();
|
|
#if MCU_VARIANT == MCU_ESP32
|
|
esp_partition_t partition;
|
|
partition.address = ESP_PARTITION_TABLE_OFFSET;
|
|
partition.size = ESP_PARTITION_TABLE_MAX_LEN;
|
|
partition.type = ESP_PARTITION_TYPE_DATA;
|
|
esp_partition_get_sha256(&partition, dev_partition_table_hash);
|
|
partition.address = ESP_BOOTLOADER_OFFSET;
|
|
partition.size = ESP_PARTITION_TABLE_OFFSET;
|
|
partition.type = ESP_PARTITION_TYPE_APP;
|
|
esp_partition_get_sha256(&partition, dev_bootloader_hash);
|
|
esp_partition_get_sha256(esp_ota_get_running_partition(), dev_firmware_hash);
|
|
#elif MCU_VARIANT == MCU_NRF52
|
|
// todo, add bootloader, partition table, or softdevice?
|
|
calculate_region_hash(APPLICATION_START, USER_DATA_START, dev_firmware_hash);
|
|
#endif
|
|
#if VALIDATE_FIRMWARE
|
|
for (uint8_t i = 0; i < DEV_HASH_LEN; i++) {
|
|
if (dev_firmware_hash_target[i] != dev_firmware_hash[i]) {
|
|
fw_signature_validated = false;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
bool device_firmware_ok() {
|
|
return fw_signature_validated;
|
|
}
|
|
|
|
#if MCU_VARIANT == MCU_ESP32 || MCU_VARIANT == MCU_NRF52
|
|
bool device_init() {
|
|
if (bt_ready) {
|
|
#if MCU_VARIANT == MCU_ESP32
|
|
for (uint8_t i=0; i<EEPROM_SIG_LEN; i++){dev_eeprom_signature[i]=EEPROM.read(eeprom_addr(ADDR_SIGNATURE+i));}
|
|
mbedtls_md_context_t ctx;
|
|
mbedtls_md_type_t md_type = MBEDTLS_MD_SHA256;
|
|
mbedtls_md_init(&ctx);
|
|
mbedtls_md_setup(&ctx, mbedtls_md_info_from_type(md_type), 0);
|
|
mbedtls_md_starts(&ctx);
|
|
#if HAS_BLUETOOTH == true || HAS_BLE == true
|
|
mbedtls_md_update(&ctx, dev_bt_mac, BT_DEV_ADDR_LEN);
|
|
#else
|
|
// TODO: Get from BLE stack instead
|
|
// mbedtls_md_update(&ctx, dev_bt_mac, BT_DEV_ADDR_LEN);
|
|
#endif
|
|
mbedtls_md_update(&ctx, dev_eeprom_signature, EEPROM_SIG_LEN);
|
|
mbedtls_md_finish(&ctx, dev_hash);
|
|
mbedtls_md_free(&ctx);
|
|
#elif MCU_VARIANT == MCU_NRF52
|
|
for (uint8_t i=0; i<EEPROM_SIG_LEN; i++){dev_eeprom_signature[i]=eeprom_read(eeprom_addr(ADDR_SIGNATURE+i));}
|
|
nRFCrypto.begin();
|
|
|
|
nRFCrypto_Hash hash;
|
|
|
|
hash.begin(CRYS_HASH_SHA256_mode);
|
|
|
|
#if HAS_BLUETOOTH == true || HAS_BLE == true
|
|
hash.update(dev_bt_mac, BT_DEV_ADDR_LEN);
|
|
#else
|
|
// TODO: Get from BLE stack instead
|
|
// hash.update(dev_bt_mac, BT_DEV_ADDR_LEN);
|
|
#endif
|
|
hash.update(dev_eeprom_signature, EEPROM_SIG_LEN);
|
|
|
|
hash.end(dev_hash);
|
|
#endif
|
|
device_load_signature();
|
|
device_validate_signature();
|
|
|
|
device_validate_partitions();
|
|
|
|
#if MCU_VARIANT == MCU_NRF52
|
|
nRFCrypto.end();
|
|
#endif
|
|
device_init_done = true;
|
|
return device_init_done && fw_signature_validated;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
#endif
|