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feat: incremental SHA256 verification before esp_ota_set_boot_partition

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This commit is contained in:
eddy 2026-07-30 19:13:27 +02:00
commit ea8bab4571
1 changed files with 22 additions and 1 deletions
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23
src/main.cpp
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@ -3,6 +3,7 @@
#include <NimBLEAdvertising.h>
#include <mbedtls/md.h>
#include <mbedtls/sha256.h>
#include <Preferences.h>
#include <esp_ota_ops.h>
#include <esp_partition.h>
@ -50,6 +51,8 @@ const esp_partition_t *otaPartition = nullptr;
uint32_t otaExpectedSize = 0;
uint32_t otaWritten = 0;
uint8_t otaExpectedSha[32];
mbedtls_sha256_context otaShaCtx;
bool otaShaStarted = false;
uint8_t hmacKey[HMAC_KEY_LEN];
uint8_t deviceUuid[ESP_UUID_LEN];
@ -129,6 +132,10 @@ static void otaReset() {
otaPartition = nullptr;
otaExpectedSize = 0;
otaWritten = 0;
if (otaShaStarted) {
mbedtls_sha256_free(&otaShaCtx);
otaShaStarted = false;
}
}
static void sendOtaNotify(NimBLECharacteristic *otaChar, uint8_t status, uint32_t seq) {
@ -179,6 +186,9 @@ class OtaCharacteristicCallbacks : public NimBLECharacteristicCallbacks {
}
otaInProgress = true;
otaWritten = 0;
mbedtls_sha256_init(&otaShaCtx);
mbedtls_sha256_starts_ret(&otaShaCtx, 0);
otaShaStarted = true;
digitalWrite(RELAY1_PIN, LOW);
digitalWrite(RELAY2_PIN, LOW);
relay1State = false;
@ -191,6 +201,10 @@ class OtaCharacteristicCallbacks : public NimBLECharacteristicCallbacks {
if (len == 32 && otaInProgress) {
memcpy(otaExpectedSha, data, 32);
uint8_t computedSha[32];
mbedtls_sha256_finish_ret(&otaShaCtx, computedSha);
mbedtls_sha256_free(&otaShaCtx);
otaShaStarted = false;
esp_err_t err = esp_ota_end(otaHandle);
if (err != ESP_OK) {
Serial.printf("OTA: end failed (%d)\n", err);
@ -198,6 +212,12 @@ class OtaCharacteristicCallbacks : public NimBLECharacteristicCallbacks {
sendOtaNotify(pChar, OTA_STATUS_ERROR, 0);
return;
}
if (memcmp(computedSha, otaExpectedSha, 32) != 0) {
Serial.println("OTA: SHA256 mismatch — aborting");
otaReset();
sendOtaNotify(pChar, OTA_STATUS_ERROR, 0);
return;
}
err = esp_ota_set_boot_partition(otaPartition);
if (err != ESP_OK) {
Serial.printf("OTA: set boot partition failed (%d)\n", err);
@ -207,7 +227,7 @@ class OtaCharacteristicCallbacks : public NimBLECharacteristicCallbacks {
}
digitalWrite(LED_PIN, HIGH);
sendOtaNotify(pChar, OTA_STATUS_COMPLETE, 0);
Serial.println("OTA: complete, rebooting...");
Serial.println("OTA: SHA256 OK, rebooting...");
delay(500);
esp_restart();
return;
@ -219,6 +239,7 @@ class OtaCharacteristicCallbacks : public NimBLECharacteristicCallbacks {
uint32_t seq = ((uint32_t)data[0] << 24) | ((uint32_t)data[1] << 16) |
((uint32_t)data[2] << 8) | (uint32_t)data[3];
size_t dataLen = len - 4;
mbedtls_sha256_update_ret(&otaShaCtx, data + 4, dataLen);
esp_err_t err = esp_ota_write(otaHandle, data + 4, dataLen);
if (err != ESP_OK) {
Serial.printf("OTA: write err at seq %lu (%d)\n", seq, err);