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https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
Secure boot v2 support for ESP32-S2
This commit is contained in:
Supreet Deshpande
bot
parent
ba717a298f
commit
e640e148cf
@ -40,6 +40,12 @@
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#include "esp_system.h"
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#include "esp_efuse.h"
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#ifdef CONFIG_IDF_TARGET_ESP32
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#include "esp32/rom/crc.h"
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#elif CONFIG_IDF_TARGET_ESP32S2
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#include "esp32s2/rom/crc.h"
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#include "esp32s2/rom/secure_boot.h"
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#endif
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#define SUB_TYPE_ID(i) (i & 0x0F)
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@ -857,3 +863,24 @@ esp_err_t esp_ota_erase_last_boot_app_partition(void)
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return ESP_OK;
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}
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#if CONFIG_IDF_TARGET_ESP32S2 && CONFIG_SECURE_BOOT_V2_ENABLED
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esp_err_t esp_ota_revoke_secure_boot_public_key(esp_ota_secure_boot_public_key_index_t index) {
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if (!esp_secure_boot_enabled()) {
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ESP_LOGE(TAG, "Secure boot v2 has not been enabled.");
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return ESP_FAIL;
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}
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if (index != SECURE_BOOT_PUBLIC_KEY_INDEX_0 &&
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index != SECURE_BOOT_PUBLIC_KEY_INDEX_1 &&
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index != SECURE_BOOT_PUBLIC_KEY_INDEX_2) {
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ESP_LOGE(TAG, "Invalid Index found for public key revocation %d.", index);
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return ESP_ERR_INVALID_ARG;
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}
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ets_secure_boot_revoke_public_key_digest(index);
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ESP_LOGI(TAG, "Revoked signature block %d.", index);
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return ESP_OK;
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}
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#endif
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@ -299,6 +299,34 @@ esp_err_t esp_ota_erase_last_boot_app_partition(void);
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*/
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bool esp_ota_check_rollback_is_possible(void);
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#if CONFIG_IDF_TARGET_ESP32S2 && (CONFIG_SECURE_BOOT_V2_ENABLED || __DOXYGEN__)
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/**
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* Secure Boot V2 public key indexes.
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*/
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typedef enum {
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SECURE_BOOT_PUBLIC_KEY_INDEX_0, /*!< Points to the 0th index of the Secure Boot v2 public key */
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SECURE_BOOT_PUBLIC_KEY_INDEX_1, /*!< Points to the 1st index of the Secure Boot v2 public key */
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SECURE_BOOT_PUBLIC_KEY_INDEX_2 /*!< Points to the 2nd index of the Secure Boot v2 public key */
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} esp_ota_secure_boot_public_key_index_t;
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/**
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* @brief Revokes the old signature digest. To be called in the application after the rollback logic.
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*
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* Relevant for Secure boot v2 on ESP32-S2 where upto 3 key digests can be stored (Key #N-1, Key #N, Key #N+1).
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* When key #N-1 used to sign an app is invalidated, an OTA update is to be sent with an app signed with key #N-1 & Key #N.
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* After successfully booting the OTA app should call this function to revoke Key #N-1.
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*
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* @param index - The index of the signature block to be revoked
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*
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* @return
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* - ESP_OK: If revocation is successful.
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* - ESP_ERR_INVALID_ARG: If the index of the public key to be revoked is incorrect.
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* - ESP_FAIL: If secure boot v2 has not been enabled.
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*/
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esp_err_t esp_ota_revoke_secure_boot_public_key(esp_ota_secure_boot_public_key_index_t index);
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#endif /* CONFIG_IDF_TARGET_ESP32S2 */
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#ifdef __cplusplus
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}
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#endif
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@ -383,7 +383,7 @@ menu "Security features"
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config SECURE_SIGNED_APPS_RSA_SCHEME
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bool "RSA"
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depends on ESP32_REV_MIN_3 && SECURE_BOOT_V2_ENABLED
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depends on (ESP32_REV_MIN_3 || IDF_TARGET_ESP32S2) && SECURE_BOOT_V2_ENABLED
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help
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Appends the RSA-3072 based Signature block to the application.
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Refer to <Secure Boot Version 2 documentation link> before enabling.
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@ -447,7 +447,9 @@ menu "Security features"
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config SECURE_BOOT_V2_ENABLED
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bool "Enable Secure Boot version 2"
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depends on ESP32_REV_MIN_3
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depends on ESP32_REV_MIN_3 || IDF_TARGET_ESP32S2
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select SECURE_ENABLE_SECURE_ROM_DL_MODE if IDF_TARGET_ESP32S2 && !SECURE_INSECURE_ALLOW_DL_MODE
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select SECURE_DISABLE_ROM_DL_MODE if ESP32_REV_MIN_3 && !SECURE_INSECURE_ALLOW_DL_MODE
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help
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Build a bootloader which enables Secure Boot version 2 on first boot.
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Refer to Secure Boot V2 section of the ESP-IDF Programmer's Guide for this version before enabling.
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@ -681,6 +683,19 @@ menu "Security features"
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key digest, causing an immediate denial of service and possibly allowing an additional fault
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injection attack to bypass the signature protection.
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config SECURE_INSECURE_ALLOW_DL_MODE
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bool "Don't automatically restrict UART download mode"
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depends on SECURE_BOOT_INSECURE && SECURE_BOOT_V2_ENABLED
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default N
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help
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By default, enabling either flash encryption in release mode or secure boot will automatically
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disable UART download mode on ESP32 ECO3, or enable secure download mode on newer chips.
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This is recommended to reduce the attack surface of the chip.
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To allow the full UART download mode to stay enabled, enable this option and ensure
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the options SECURE_DISABLE_ROM_DL_MODE and SECURE_ENABLE_SECURE_ROM_DL_MODE are disabled as applicable.
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This is not recommended.
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config SECURE_FLASH_UART_BOOTLOADER_ALLOW_ENC
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bool "Leave UART bootloader encryption enabled"
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depends on SECURE_FLASH_ENCRYPTION_MODE_DEVELOPMENT
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@ -92,15 +92,15 @@ endif()
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if(CONFIG_SECURE_BOOT_V2_ENABLED)
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if(CONFIG_SECURE_BOOT_BUILD_SIGNED_BINARIES)
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get_filename_component(secure_boot_signing_key
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get_filename_component(secure_boot_signing_key
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"${SECURE_BOOT_SIGNING_KEY}" ABSOLUTE BASE_DIR "${project_dir}")
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if(NOT EXISTS "${secure_boot_signing_key}")
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message(FATAL_ERROR
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"Secure Boot Signing Key Not found."
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"\nGenerate the Secure Boot V2 RSA-PSS 3072 Key."
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"\nTo generate one, you can use this command:"
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"\n\t${espsecurepy} generate_signing_key --version 2 ${SECURE_BOOT_SIGNING_KEY}")
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message(FATAL_ERROR
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"Secure Boot Signing Key Not found."
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"\nGenerate the Secure Boot V2 RSA-PSS 3072 Key."
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"\nTo generate one, you can use this command:"
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"\n\t${espsecurepy} generate_signing_key --version 2 ${SECURE_BOOT_SIGNING_KEY}")
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endif()
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set(bootloader_unsigned_bin "bootloader-unsigned.bin")
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@ -117,7 +117,7 @@ if(CONFIG_SECURE_BOOT_V2_ENABLED)
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else()
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add_custom_command(OUTPUT ".signed_bin_timestamp"
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VERBATIM
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COMMENT "Bootloader generated but not signed")
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COMMENT "Bootloader generated but not signed")
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endif()
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add_custom_target (gen_signed_bootloader ALL DEPENDS "${build_dir}/.signed_bin_timestamp")
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@ -166,6 +166,24 @@ elseif(CONFIG_SECURE_BOOTLOADER_REFLASHABLE)
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"* Not recommended to re-use the same secure boot keyfile on multiple production devices."
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DEPENDS gen_secure_bootloader_key gen_bootloader_digest_bin
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VERBATIM)
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elseif(CONFIG_SECURE_BOOT_V2_ENABLED AND CONFIG_IDF_TARGET_ESP32S2)
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add_custom_command(TARGET bootloader.elf POST_BUILD
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COMMAND ${CMAKE_COMMAND} -E echo
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"=============================================================================="
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COMMAND ${CMAKE_COMMAND} -E echo
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"Bootloader built. Secure boot enabled, so bootloader not flashed automatically."
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COMMAND ${CMAKE_COMMAND} -E echo
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"To sign the bootloader with additional private keys."
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COMMAND ${CMAKE_COMMAND} -E echo
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"\t${espsecurepy} sign_data -k secure_boot_signing_key2.pem -v 2 --append_signatures -o signed_bootloader.bin build/bootloader/bootloader.bin"
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COMMAND ${CMAKE_COMMAND} -E echo
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"Secure boot enabled, so bootloader not flashed automatically."
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COMMAND ${CMAKE_COMMAND} -E echo
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"\t${esptoolpy_write_flash} ${BOOTLOADER_OFFSET} ${CMAKE_BINARY_DIR}/bootloader.bin"
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COMMAND ${CMAKE_COMMAND} -E echo
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"=============================================================================="
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DEPENDS gen_signed_bootloader
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VERBATIM)
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elseif(CONFIG_SECURE_BOOT_V2_ENABLED)
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add_custom_command(TARGET bootloader.elf POST_BUILD
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COMMAND ${CMAKE_COMMAND} -E echo
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@ -820,6 +820,7 @@ void bootloader_debug_buffer(const void *buffer, size_t length, const char *labe
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esp_err_t bootloader_sha256_flash_contents(uint32_t flash_offset, uint32_t len, uint8_t *digest)
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{
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if (digest == NULL) {
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return ESP_ERR_INVALID_ARG;
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}
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@ -836,7 +837,7 @@ esp_err_t bootloader_sha256_flash_contents(uint32_t flash_offset, uint32_t len,
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while (len > 0) {
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uint32_t mmu_page_offset = ((flash_offset & MMAP_ALIGNED_MASK) != 0) ? 1 : 0; /* Skip 1st MMU Page if it is already populated */
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uint32_t partial_image_len = MIN(len, ((mmu_free_pages_count - mmu_page_offset) * SPI_FLASH_MMU_PAGE_SIZE)); /* Read the image that fits in the free MMU pages */
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const void * image = bootloader_mmap(flash_offset, partial_image_len);
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if (image == NULL) {
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bootloader_sha256_finish(sha_handle, NULL);
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@ -392,6 +392,17 @@ esp_err_t esp_secure_boot_v2_permanently_enable(const esp_image_metadata_t *imag
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ESP_LOGW(TAG, "Not disabling ROM BASIC fallback - SECURITY COMPROMISED");
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#endif
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#ifdef CONFIG_SECURE_DISABLE_ROM_DL_MODE
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ESP_LOGI(TAG, "Disable ROM Download mode...");
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esp_err_t err = esp_efuse_disable_rom_download_mode();
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "Could not disable ROM Download mode...");
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return ESP_FAIL;
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}
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#else
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ESP_LOGW(TAG, "Not disabling ROM Download mode - SECURITY COMPROMISED");
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#endif
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#ifndef CONFIG_SECURE_BOOT_V2_ALLOW_EFUSE_RD_DIS
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bool rd_dis_now = true;
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#ifdef CONFIG_SECURE_FLASH_ENC_ENABLED
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@ -11,43 +11,311 @@
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "esp_secure_boot.h"
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#include <string.h>
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#include "esp_log.h"
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#include "esp_secure_boot.h"
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#include "soc/efuse_reg.h"
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#include "bootloader_flash.h"
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#include "bootloader_sha.h"
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#include "bootloader_utility.h"
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#include "esp_rom_crc.h"
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#include "esp_efuse.h"
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#include "esp_efuse_table.h"
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#include "esp32s2/rom/secure_boot.h"
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static const char *TAG = "secure_boot";
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static const char *TAG = "secure_boot_v2";
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#define ALIGN_UP(num, align) (((num) + ((align) - 1)) & ~((align) - 1))
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esp_err_t esp_secure_boot_permanently_enable(void)
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#define SIG_BLOCK_MAGIC_BYTE 0xe7
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#define CRC_SIGN_BLOCK_LEN 1196
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#define SIG_BLOCK_PADDING 4096
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#define DIGEST_LEN 32
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/* A signature block is valid when it has correct magic byte, crc and image digest. */
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static esp_err_t validate_signature_block(int block_num, const ets_secure_boot_signature_t *sig_block, uint8_t *digest)
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{
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uint8_t hash[32];
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if (esp_rom_efuse_is_secure_boot_enabled())
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{
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ESP_LOGI(TAG, "secure boot is already enabled, continuing..");
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uint32_t crc = esp_rom_crc32_le(0, (uint8_t *)&sig_block->block[block_num], CRC_SIGN_BLOCK_LEN);
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if (sig_block->block[block_num].magic_byte != SIG_BLOCK_MAGIC_BYTE) {
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// All signature blocks have been parsed, no new signature block present.
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ESP_LOGD(TAG, "Signature block(%d) invalid/absent.", block_num);
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return ESP_FAIL;
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}
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if (sig_block->block[block_num].block_crc != crc) {
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ESP_LOGE(TAG, "Magic byte correct but incorrect crc.");
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return ESP_FAIL;
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}
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if (memcmp(digest, sig_block->block[block_num].image_digest, DIGEST_LEN)) {
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ESP_LOGE(TAG, "Magic byte & CRC correct but incorrect image digest.");
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return ESP_FAIL;
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} else {
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ESP_LOGD(TAG, "valid signature block(%d) found", block_num);
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return ESP_OK;
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}
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ESP_LOGI(TAG, "Verifying bootloader signature...\n");
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int r = ets_secure_boot_verify_bootloader(hash, false);
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if (r != ESP_OK) {
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ESP_LOGE(TAG, "Failed to verify bootloader signature");
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return r;
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return ESP_FAIL;
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}
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// Inputs the flash_offset and length of an image(app or bootloader), validates & verifies its secure boot v2 signature.
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// Generates the public key digests of the valid public keys in a signature block and writes it into trusted_keys.
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// The key_digests in trusted keys whose signature blocks are invalid will be set to NULL.
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static esp_err_t secure_boot_v2_digest_generate(uint32_t flash_offset, uint32_t flash_size, ets_secure_boot_key_digests_t * const trusted_keys)
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{
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int i = 0;
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esp_err_t ret = ESP_FAIL;
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uint8_t image_digest[DIGEST_LEN] = {0};
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uint8_t public_key_digests[SECURE_BOOT_NUM_BLOCKS][DIGEST_LEN];
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size_t sig_block_addr = flash_offset + ALIGN_UP(flash_size, FLASH_SECTOR_SIZE);
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ret = bootloader_sha256_flash_contents(flash_offset, sig_block_addr - flash_offset, image_digest);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "error generating image digest, %d", ret);
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return ret;
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}
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esp_efuse_batch_write_begin(); /* Batch all efuse writes at the end of this function */
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ESP_LOGD(TAG, "reading signature block");
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const ets_secure_boot_signature_t *sig_block = bootloader_mmap(sig_block_addr, sizeof(ets_secure_boot_signature_t));
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if (sig_block == NULL) {
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ESP_LOGE(TAG, "bootloader_mmap(0x%x, 0x%x) failed", sig_block_addr, sizeof(ets_secure_boot_signature_t));
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return ESP_FAIL;
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}
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for (i = 0; i < SECURE_BOOT_NUM_BLOCKS; i++) {
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ret = validate_signature_block(i, sig_block, image_digest);
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if (ret != ESP_OK) {
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break;
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}
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/* Generating the SHA of the public key components in the signature block */
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bootloader_sha256_handle_t sig_block_sha;
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sig_block_sha = bootloader_sha256_start();
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bootloader_sha256_data(sig_block_sha, &sig_block->block[i].key, sizeof(sig_block->block[i].key));
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bootloader_sha256_finish(sig_block_sha, public_key_digests[i]);
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memcpy((uint8_t *)trusted_keys->key_digests[0], public_key_digests[i], DIGEST_LEN); // Overwriting 0th index to verify each valid signature block
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/* A signature block is verified when it is valid and the signature in its signature block can be verified with a valid public key */
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uint8_t verified_digest[DIGEST_LEN] = {0};
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ets_secure_boot_status_t r = ets_secure_boot_verify_signature(sig_block, image_digest, trusted_keys, verified_digest);
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if (r != SB_SUCCESS) {
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ESP_LOGE(TAG, "Secure boot key (%d) verification failed.", i);
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ret = ESP_FAIL;
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goto exit;
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}
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}
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// At least 1 verified signature block found.
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if (i > 0) {
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// validate_signature_block returns ESP_FAIL when a sig block is absent, which isn't an error.
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while (--i) {
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trusted_keys->key_digests[i] = public_key_digests[i];
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}
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ret = ESP_OK;
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}
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exit:
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/* Set the pointer to an invalid/absent block to NULL */
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while (i < SECURE_BOOT_NUM_BLOCKS) {
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trusted_keys->key_digests[i] = NULL;
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i++;
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}
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ESP_LOGI(TAG, "Secure boot verification success.");
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bootloader_munmap(sig_block);
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return ret;
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}
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/* Traverses ets_secure_boot_key_digests_t to find the number of non-null key_digests */
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static uint8_t get_signature_block_count(ets_secure_boot_key_digests_t * const trusted_keys) {
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uint8_t bootloader_sig_block_count = 0;
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for (uint8_t i = 0; i < SECURE_BOOT_NUM_BLOCKS; i++) {
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if (trusted_keys->key_digests[i] != NULL) {
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bootloader_sig_block_count++;
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for (uint8_t j = 0; j < DIGEST_LEN ; j++) {
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ESP_LOGD(TAG, "Secure Boot Digest %d: 0x%x", i, *(((uint8_t *)trusted_keys->key_digests[i]) + j));
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}
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}
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}
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return bootloader_sig_block_count;
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}
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esp_err_t esp_secure_boot_v2_permanently_enable(const esp_image_metadata_t *image_data)
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{
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ESP_LOGI(TAG, "enabling secure boot v2 - ESP32-S2...");
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if (esp_secure_boot_enabled()) {
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ESP_LOGI(TAG, "secure boot v2 is already enabled, continuing..");
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return ESP_OK;
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}
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esp_err_t ret;
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/* Verify the bootloader */
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esp_image_metadata_t bootloader_data = { 0 };
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ret = esp_image_verify_bootloader_data(&bootloader_data);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "bootloader image appears invalid! error %d", ret);
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return ret;
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}
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/* Check if secure boot digests are present */
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bool has_secure_boot_digest = ets_efuse_find_purpose(ETS_EFUSE_KEY_PURPOSE_SECURE_BOOT_DIGEST0, NULL);
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has_secure_boot_digest |= ets_efuse_find_purpose(ETS_EFUSE_KEY_PURPOSE_SECURE_BOOT_DIGEST1, NULL);
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has_secure_boot_digest |= ets_efuse_find_purpose(ETS_EFUSE_KEY_PURPOSE_SECURE_BOOT_DIGEST2, NULL);
|
||||
ESP_LOGI(TAG, "Secure boot digests %s", has_secure_boot_digest ? "already present":"absent, generating..");
|
||||
|
||||
|
||||
ets_efuse_clear_program_registers();
|
||||
uint8_t i, j, bootloader_sig_block_count = 0;
|
||||
if (!has_secure_boot_digest) {
|
||||
ets_secure_boot_key_digests_t boot_trusted_keys, app_trusted_keys;
|
||||
uint8_t boot_trusted_key_data[SECURE_BOOT_NUM_BLOCKS][DIGEST_LEN] = {0}, app_trusted_key_data[SECURE_BOOT_NUM_BLOCKS][DIGEST_LEN] = {0};
|
||||
|
||||
for(i = 0; i < SECURE_BOOT_NUM_BLOCKS; i++) {
|
||||
boot_trusted_keys.key_digests[i] = boot_trusted_key_data[i];
|
||||
app_trusted_keys.key_digests[i] = app_trusted_key_data[i];
|
||||
}
|
||||
|
||||
/* Generate the bootloader public key digests */
|
||||
ret = secure_boot_v2_digest_generate(bootloader_data.start_addr, bootloader_data.image_len - SIG_BLOCK_PADDING, &boot_trusted_keys);
|
||||
if (ret != ESP_OK) {
|
||||
ESP_LOGE(TAG, "Public key digest generation failed.");
|
||||
return ret;
|
||||
}
|
||||
|
||||
bootloader_sig_block_count = get_signature_block_count(&boot_trusted_keys);
|
||||
if (bootloader_sig_block_count <= 0) {
|
||||
ESP_LOGI(TAG, "No valid signature blocks found. %d signature block(s) found.", bootloader_sig_block_count);
|
||||
return ESP_FAIL;
|
||||
}
|
||||
ESP_LOGI(TAG, "%d signature block(s) found appended to the bootloader.", bootloader_sig_block_count);
|
||||
|
||||
int unused_key_slots = ets_efuse_count_unused_key_blocks();
|
||||
if (bootloader_sig_block_count > unused_key_slots) {
|
||||
ESP_LOGE(TAG, "Bootloader signatures(%d) more than available key slots(%d).", bootloader_sig_block_count, unused_key_slots);
|
||||
return ESP_FAIL;
|
||||
}
|
||||
|
||||
for (i = 0; i < SECURE_BOOT_NUM_BLOCKS; i++) {
|
||||
if (boot_trusted_keys.key_digests[i] == NULL) {
|
||||
break;
|
||||
}
|
||||
|
||||
const uint32_t secure_boot_key_purpose[SECURE_BOOT_NUM_BLOCKS] = { ETS_EFUSE_KEY_PURPOSE_SECURE_BOOT_DIGEST0,
|
||||
ETS_EFUSE_KEY_PURPOSE_SECURE_BOOT_DIGEST1, ETS_EFUSE_KEY_PURPOSE_SECURE_BOOT_DIGEST2 };
|
||||
|
||||
ets_efuse_block_t block = ets_efuse_find_unused_key_block();
|
||||
if (block == ETS_EFUSE_BLOCK_MAX) {
|
||||
ESP_LOGE(TAG, "Key blocks not available.");
|
||||
return ESP_FAIL;
|
||||
}
|
||||
|
||||
int r = ets_efuse_write_key(block, secure_boot_key_purpose[i], boot_trusted_keys.key_digests[i], DIGEST_LEN);
|
||||
if (r != 0) {
|
||||
ESP_LOGE(TAG, "Failed to write efuse block %d with purpose %d. Can't continue.", block, secure_boot_key_purpose[i]);
|
||||
return ESP_FAIL;
|
||||
}
|
||||
|
||||
r = esp_efuse_set_write_protect(block);
|
||||
if (r != 0) {
|
||||
ESP_LOGE(TAG, "Failed to write protect efuse block %d. Can't continue.", block);
|
||||
return ESP_FAIL;
|
||||
}
|
||||
}
|
||||
|
||||
/* Generate the application public key digests */
|
||||
ret = secure_boot_v2_digest_generate(image_data->start_addr, image_data->image_len - SIG_BLOCK_PADDING, &app_trusted_keys);
|
||||
if (ret != ESP_OK) {
|
||||
ESP_LOGE(TAG, "Application signature block is invalid.");
|
||||
return ret;
|
||||
}
|
||||
|
||||
int app_sig_block_count = get_signature_block_count(&app_trusted_keys);
|
||||
ESP_LOGI(TAG, "%d signature block(s) found appended to the application.", app_sig_block_count);
|
||||
|
||||
/* Confirm if atleast one the public key from the application matches a public key in the bootloader
|
||||
(Also, ensure if that public revoke bit is not set for the matched key) */
|
||||
bool match = false;
|
||||
const uint32_t revoke_bits[SECURE_BOOT_NUM_BLOCKS] = { EFUSE_SECURE_BOOT_KEY_REVOKE0,
|
||||
EFUSE_SECURE_BOOT_KEY_REVOKE1, EFUSE_SECURE_BOOT_KEY_REVOKE2 };
|
||||
|
||||
for (i = 0; i < SECURE_BOOT_NUM_BLOCKS && match == false; i++) {
|
||||
|
||||
if (REG_GET_BIT(EFUSE_RD_REPEAT_DATA1_REG, revoke_bits[i])) {
|
||||
ESP_LOGI(TAG, "Key block(%d) has been revoked.", i);
|
||||
continue; // skip if the key block is revoked
|
||||
}
|
||||
|
||||
for (j = 0; j < SECURE_BOOT_NUM_BLOCKS; j++) {
|
||||
if (!memcmp(boot_trusted_key_data[i], app_trusted_key_data[j], DIGEST_LEN)) {
|
||||
ESP_LOGI(TAG, "Application key(%d) matches with bootloader key(%d).", j, i);
|
||||
match = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (match == false) {
|
||||
ESP_LOGE(TAG, "No application key digest matches the bootloader key digest.");
|
||||
return ESP_FAIL;
|
||||
}
|
||||
|
||||
/* Revoke the empty signature blocks */
|
||||
if (bootloader_sig_block_count < SECURE_BOOT_NUM_BLOCKS) {
|
||||
/* The revocation index can be 0, 1, 2. Bootloader count can be 1,2,3. */
|
||||
for (uint8_t i = bootloader_sig_block_count; i < SECURE_BOOT_NUM_BLOCKS; i++) {
|
||||
ESP_LOGI(TAG, "Revoking empty key digest slot (%d)...", i);
|
||||
ets_secure_boot_revoke_public_key_digest(i);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
esp_err_t err = esp_efuse_batch_write_begin();
|
||||
if (err != ESP_OK) {
|
||||
ESP_LOGI(TAG, "Error batch programming security eFuses.");
|
||||
return err;
|
||||
}
|
||||
|
||||
__attribute__((unused)) static const uint8_t enable = 1;
|
||||
|
||||
esp_efuse_write_field_bit(ESP_EFUSE_SECURE_BOOT_EN);
|
||||
esp_efuse_write_field_bit(ESP_EFUSE_DIS_BOOT_REMAP);
|
||||
esp_efuse_write_field_bit(ESP_EFUSE_DIS_LEGACY_SPI_BOOT);
|
||||
|
||||
// TODO: also disable JTAG here, etc
|
||||
#ifdef CONFIG_SECURE_ENABLE_SECURE_ROM_DL_MODE
|
||||
ESP_LOGI(TAG, "Enabling Security download mode...");
|
||||
esp_efuse_write_field_bit(ESP_EFUSE_ENABLE_SECURITY_DOWNLOAD);
|
||||
#else
|
||||
ESP_LOGW(TAG, "Not enabling Security download mode - SECURITY COMPROMISED");
|
||||
#endif
|
||||
|
||||
esp_err_t err = esp_efuse_batch_write_commit();
|
||||
#ifndef CONFIG_SECURE_BOOT_ALLOW_JTAG
|
||||
ESP_LOGI(TAG, "Disable hardware & software JTAG...");
|
||||
esp_efuse_write_field_bit(ESP_EFUSE_HARD_DIS_JTAG);
|
||||
esp_efuse_write_field_bit(ESP_EFUSE_SOFT_DIS_JTAG);
|
||||
#else
|
||||
ESP_LOGW(TAG, "Not disabling JTAG - SECURITY COMPROMISED");
|
||||
#endif
|
||||
|
||||
if (err == ESP_OK) {
|
||||
assert(esp_rom_efuse_is_secure_boot_enabled());
|
||||
ESP_LOGI(TAG, "Secure boot permanently enabled");
|
||||
#ifdef CONFIG_SECURE_BOOT_ENABLE_AGGRESSIVE_KEY_REVOKE
|
||||
esp_efuse_write_field_bit(ESP_EFUSE_SECURE_BOOT_AGGRESSIVE_REVOKE);
|
||||
#endif
|
||||
|
||||
esp_efuse_write_field_bit(ESP_EFUSE_SECURE_BOOT_EN);
|
||||
|
||||
err = esp_efuse_batch_write_commit();
|
||||
if (err != ESP_OK) {
|
||||
ESP_LOGI(TAG, "Error programming security eFuses.");
|
||||
return err;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_SECURE_BOOT_ENABLE_AGGRESSIVE_KEY_REVOKE
|
||||
assert(ets_efuse_secure_boot_aggressive_revoke_enabled());
|
||||
#endif
|
||||
|
||||
assert(esp_rom_efuse_is_secure_boot_enabled());
|
||||
ESP_LOGI(TAG, "Secure boot permanently enabled");
|
||||
|
||||
return ESP_OK;
|
||||
}
|
||||
|
||||
@ -13,29 +13,32 @@
|
||||
// limitations under the License.
|
||||
#include "sdkconfig.h"
|
||||
|
||||
#include <string.h>
|
||||
#include "esp_fault.h"
|
||||
#include "bootloader_flash.h"
|
||||
#include "bootloader_sha.h"
|
||||
#include "bootloader_utility.h"
|
||||
#include "esp_log.h"
|
||||
#include "esp_image_format.h"
|
||||
#include "esp_secure_boot.h"
|
||||
#include "esp32s2/rom/secure_boot.h"
|
||||
|
||||
static const char* TAG = "secure_boot";
|
||||
|
||||
#define DIGEST_LEN 32
|
||||
#define ALIGN_UP(num, align) (((num) + ((align) - 1)) & ~((align) - 1))
|
||||
|
||||
esp_err_t esp_secure_boot_verify_signature(uint32_t src_addr, uint32_t length)
|
||||
{
|
||||
ets_secure_boot_key_digests_t trusted_keys = { 0 };
|
||||
uint8_t digest[DIGEST_LEN];
|
||||
uint8_t verified_digest[DIGEST_LEN] = { 0 }; /* Note: this function doesn't do any anti-FI checks on this buffer */
|
||||
const uint8_t *data;
|
||||
|
||||
ESP_LOGD(TAG, "verifying signature src_addr 0x%x length 0x%x", src_addr, length);
|
||||
|
||||
if ((src_addr + length) % 4096 != 0) {
|
||||
ESP_LOGE(TAG, "addr 0x%x length 0x%x doesn't end on a sector boundary", src_addr, length);
|
||||
return ESP_ERR_INVALID_ARG;
|
||||
}
|
||||
/* Padding to round off the input to the nearest 4k boundary */
|
||||
int padded_length = ALIGN_UP(length, FLASH_SECTOR_SIZE);
|
||||
ESP_LOGD(TAG, "verifying src_addr 0x%x length", src_addr, padded_length);
|
||||
|
||||
data = bootloader_mmap(src_addr, length + sizeof(struct ets_secure_boot_sig_block));
|
||||
if (data == NULL) {
|
||||
@ -43,23 +46,16 @@ esp_err_t esp_secure_boot_verify_signature(uint32_t src_addr, uint32_t length)
|
||||
return ESP_FAIL;
|
||||
}
|
||||
|
||||
// Calculate digest of main image
|
||||
#ifdef BOOTLOADER_BUILD
|
||||
bootloader_sha256_handle_t handle = bootloader_sha256_start();
|
||||
bootloader_sha256_data(handle, data, length);
|
||||
bootloader_sha256_finish(handle, digest);
|
||||
#else
|
||||
/* Use thread-safe esp-idf SHA function */
|
||||
esp_sha(SHA2_256, data, length, digest);
|
||||
#endif
|
||||
|
||||
int r = ets_secure_boot_read_key_digests(&trusted_keys);
|
||||
|
||||
if (r == ETS_OK) {
|
||||
const ets_secure_boot_signature_t *sig = (const ets_secure_boot_signature_t *)(data + length);
|
||||
// TODO: calling this function in IDF app context is unsafe
|
||||
r = ets_secure_boot_verify_signature(sig, digest, &trusted_keys, verified_digest);
|
||||
/* Calculate digest of main image */
|
||||
esp_err_t err = bootloader_sha256_flash_contents(src_addr, padded_length, digest);
|
||||
if (err != ESP_OK) {
|
||||
ESP_LOGE(TAG, "Digest calculation failed 0x%x, 0x%x", src_addr, padded_length);
|
||||
bootloader_munmap(data);
|
||||
return err;
|
||||
}
|
||||
|
||||
const ets_secure_boot_signature_t *sig = (const ets_secure_boot_signature_t *)(data + length);
|
||||
int r = esp_secure_boot_verify_rsa_signature_block(sig, digest, verified_digest);
|
||||
bootloader_munmap(data);
|
||||
|
||||
return (r == ETS_OK) ? ESP_OK : ESP_FAIL;
|
||||
@ -68,15 +64,29 @@ esp_err_t esp_secure_boot_verify_signature(uint32_t src_addr, uint32_t length)
|
||||
esp_err_t esp_secure_boot_verify_rsa_signature_block(const ets_secure_boot_signature_t *sig_block, const uint8_t *image_digest, uint8_t *verified_digest)
|
||||
{
|
||||
ets_secure_boot_key_digests_t trusted_keys;
|
||||
ets_secure_boot_key_digests_t trusted_key_copies[2];
|
||||
ETS_STATUS r;
|
||||
|
||||
int r = ets_secure_boot_read_key_digests(&trusted_keys);
|
||||
if (r != 0) {
|
||||
ESP_LOGE(TAG, "No trusted key digests were found in efuse!");
|
||||
} else {
|
||||
ESP_LOGD(TAG, "Verifying with RSA-PSS...");
|
||||
// TODO: calling this function in IDF app context is unsafe
|
||||
r = ets_secure_boot_verify_signature(sig_block, image_digest, &trusted_keys, verified_digest);
|
||||
memset(&trusted_keys, 0, sizeof(ets_secure_boot_key_digests_t));
|
||||
memset(trusted_key_copies, 0, 2 * sizeof(ets_secure_boot_key_digests_t));
|
||||
|
||||
if (!esp_secure_boot_enabled()) {
|
||||
return ESP_OK;
|
||||
}
|
||||
|
||||
return (r == 0) ? ESP_OK : ESP_ERR_IMAGE_INVALID;
|
||||
r = ets_secure_boot_read_key_digests(&trusted_keys);
|
||||
if (r != ETS_OK) {
|
||||
ESP_LOGI(TAG, "Could not read secure boot digests!");
|
||||
return ESP_FAIL;
|
||||
}
|
||||
|
||||
// Create the copies for FI checks (assuming result is ETS_OK, if it's not then it'll fail the fault check anyhow)
|
||||
ets_secure_boot_read_key_digests(&trusted_key_copies[0]);
|
||||
ets_secure_boot_read_key_digests(&trusted_key_copies[1]);
|
||||
ESP_FAULT_ASSERT(memcmp(&trusted_keys, &trusted_key_copies[0], sizeof(ets_secure_boot_key_digests_t)) == 0);
|
||||
ESP_FAULT_ASSERT(memcmp(&trusted_keys, &trusted_key_copies[1], sizeof(ets_secure_boot_key_digests_t)) == 0);
|
||||
|
||||
ESP_LOGI(TAG, "Verifying with RSA-PSS boot...");
|
||||
r = ets_secure_boot_verify_signature(sig_block, image_digest, &trusted_keys, verified_digest);
|
||||
return (r == ETS_OK) ? ESP_OK : ESP_FAIL;
|
||||
}
|
||||
|
||||
@ -275,7 +275,7 @@ static esp_err_t image_load(esp_image_load_mode_t mode, const esp_partition_pos_
|
||||
"only verify signature in bootloader" into the macro so it's tested multiple times.
|
||||
*/
|
||||
#if CONFIG_SECURE_BOOT_V2_ENABLED
|
||||
ESP_FAULT_ASSERT(memcmp(image_digest, verified_digest, HASH_LEN) == 0);
|
||||
ESP_FAULT_ASSERT(!esp_secure_boot_enabled() || memcmp(image_digest, verified_digest, HASH_LEN) == 0);
|
||||
#else // Secure Boot V1 on ESP32, only verify signatures for apps not bootloaders
|
||||
ESP_FAULT_ASSERT(data->start_addr == ESP_BOOTLOADER_OFFSET || memcmp(image_digest, verified_digest, HASH_LEN) == 0);
|
||||
#endif
|
||||
@ -310,7 +310,7 @@ err:
|
||||
// Prevent invalid/incomplete data leaking out
|
||||
bzero(data, sizeof(esp_image_metadata_t));
|
||||
return err;
|
||||
}
|
||||
}
|
||||
|
||||
esp_err_t bootloader_load_image(const esp_partition_pos_t *part, esp_image_metadata_t *data)
|
||||
{
|
||||
|
||||
@ -51,4 +51,5 @@ void bootloader_sha256_finish(bootloader_sha256_handle_t handle, uint8_t *digest
|
||||
}
|
||||
mbedtls_sha256_free(ctx);
|
||||
free(handle);
|
||||
handle = NULL;
|
||||
}
|
||||
|
||||
@ -27,6 +27,11 @@
|
||||
#include "mbedtls/ctr_drbg.h"
|
||||
#include <string.h>
|
||||
#include <sys/param.h>
|
||||
#include "esp_secure_boot.h"
|
||||
|
||||
#ifdef CONFIG_IDF_TARGET_ESP32S2
|
||||
#include <esp32s2/rom/secure_boot.h>
|
||||
#endif
|
||||
|
||||
#define DIGEST_LEN 32
|
||||
|
||||
@ -142,6 +147,26 @@ static const char *TAG = "secure_boot_v2";
|
||||
#define ALIGN_UP(num, align) (((num) + ((align) - 1)) & ~((align) - 1))
|
||||
#define RSA_KEY_SIZE 384 /* RSA 3072 Bits */
|
||||
|
||||
#if CONFIG_IDF_TARGET_ESP32S2
|
||||
inline static bool digest_matches(const void *trusted, const void *computed)
|
||||
{
|
||||
if (trusted == NULL) {
|
||||
return false;
|
||||
}
|
||||
|
||||
// 'trusted' is probably a pointer to read-only efuse registers,
|
||||
// which only support word reads. memcmp() cannot be guaranteed
|
||||
// to do word reads, so we make a local copy here (we know that
|
||||
// memcpy() will do word operations if it can).
|
||||
uint8_t __attribute__((aligned(4))) trusted_local[ETS_DIGEST_LEN];
|
||||
uint8_t __attribute__((aligned(4))) computed_local[ETS_DIGEST_LEN];
|
||||
|
||||
memcpy(trusted_local, trusted, ETS_DIGEST_LEN);
|
||||
memcpy(computed_local, computed, ETS_DIGEST_LEN);
|
||||
return memcmp(trusted_local, computed_local, ETS_DIGEST_LEN) == 0;
|
||||
}
|
||||
#endif /* CONFIG_IDF_TARGET_ESP32S2 */
|
||||
|
||||
esp_err_t esp_secure_boot_verify_signature(uint32_t src_addr, uint32_t length)
|
||||
{
|
||||
uint8_t digest[DIGEST_LEN] = {0};
|
||||
@ -173,23 +198,19 @@ esp_err_t esp_secure_boot_verify_signature(uint32_t src_addr, uint32_t length)
|
||||
|
||||
esp_err_t esp_secure_boot_verify_rsa_signature_block(const ets_secure_boot_signature_t *sig_block, const uint8_t *image_digest, uint8_t *verified_digest)
|
||||
{
|
||||
int i = 0;
|
||||
|
||||
uint8_t i = 0;
|
||||
#if CONFIG_SECURE_BOOT_V2_ENABLED /* Verify key against efuse block */
|
||||
uint8_t efuse_trusted_digest[DIGEST_LEN] = {0}, sig_block_trusted_digest[DIGEST_LEN] = {0};
|
||||
memcpy(efuse_trusted_digest, (uint8_t *) EFUSE_BLK2_RDATA0_REG, sizeof(efuse_trusted_digest));
|
||||
uint8_t sig_block_key_digest[SECURE_BOOT_NUM_BLOCKS][DIGEST_LEN] = {0};
|
||||
|
||||
/* Note: in IDF verification we don't add any fault injection resistance, as we don't expect this to be called
|
||||
during boot-time verification. */
|
||||
memset(verified_digest, 0, DIGEST_LEN);
|
||||
|
||||
/* Generating the SHA of the public key components in the signature block */
|
||||
bootloader_sha256_handle_t sig_block_sha;
|
||||
sig_block_sha = bootloader_sha256_start();
|
||||
bootloader_sha256_data(sig_block_sha, &sig_block->block[0].key, sizeof(sig_block->block[0].key));
|
||||
bootloader_sha256_finish(sig_block_sha, (unsigned char *)sig_block_trusted_digest);
|
||||
#if CONFIG_IDF_TARGET_ESP32
|
||||
uint8_t efuse_trusted_digest[DIGEST_LEN] = {0};
|
||||
memcpy(efuse_trusted_digest, (uint8_t *) EFUSE_BLK2_RDATA0_REG, sizeof(efuse_trusted_digest));
|
||||
|
||||
if (memcmp(efuse_trusted_digest, sig_block_trusted_digest, DIGEST_LEN) != 0) {
|
||||
if (memcmp(efuse_trusted_digest, sig_block_key_digest, DIGEST_LEN) != 0) {
|
||||
const uint8_t zeroes[DIGEST_LEN] = {0};
|
||||
/* Can't continue if secure boot is enabled, OR if a different digest is already written in efuse BLK2
|
||||
|
||||
@ -200,7 +221,25 @@ esp_err_t esp_secure_boot_verify_rsa_signature_block(const ets_secure_boot_signa
|
||||
return ESP_FAIL;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
#elif CONFIG_IDF_TARGET_ESP32S2
|
||||
bool match = false;
|
||||
ets_secure_boot_key_digests_t efuse_trusted_digest;
|
||||
ETS_STATUS r;
|
||||
r = ets_secure_boot_read_key_digests(&efuse_trusted_digest);
|
||||
if (r != 0) {
|
||||
ESP_LOGI(TAG, "Could not read secure boot digests!");
|
||||
return ESP_FAIL;
|
||||
}
|
||||
#endif /* CONFIG_IDF_TARGET_ESP32 */
|
||||
|
||||
/* Generating the SHA of the public key components in the signature block */
|
||||
for (i = 0; i < SECURE_BOOT_NUM_BLOCKS; i++) {
|
||||
bootloader_sha256_handle_t sig_block_sha;
|
||||
sig_block_sha = bootloader_sha256_start();
|
||||
bootloader_sha256_data(sig_block_sha, &sig_block->block[i].key, sizeof(sig_block->block[i].key));
|
||||
bootloader_sha256_finish(sig_block_sha, (unsigned char *)sig_block_key_digest[i]);
|
||||
}
|
||||
#endif /* CONFIG_SECURE_BOOT_V2_ENABLED */
|
||||
|
||||
ESP_LOGI(TAG, "Verifying with RSA-PSS...");
|
||||
int ret = 0;
|
||||
@ -222,6 +261,19 @@ esp_err_t esp_secure_boot_verify_rsa_signature_block(const ets_secure_boot_signa
|
||||
}
|
||||
|
||||
for (i = 0; i < SECURE_BOOT_NUM_BLOCKS; i++) {
|
||||
#if CONFIG_IDF_TARGET_ESP32S2
|
||||
for (uint8_t j = 0; j < SECURE_BOOT_NUM_BLOCKS; j++) {
|
||||
if (digest_matches(efuse_trusted_digest.key_digests[j], sig_block_key_digest[i])) {
|
||||
ESP_LOGI(TAG, "eFuse key matches(%d) matches the application key(%d).", j, i);
|
||||
match = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (match == false) {
|
||||
continue; // Skip the public keys whose digests don't match.
|
||||
}
|
||||
# endif
|
||||
|
||||
const mbedtls_mpi N = { .s = 1,
|
||||
.n = sizeof(sig_block->block[i].key.n)/sizeof(mbedtls_mpi_uint),
|
||||
.p = (void *)sig_block->block[i].key.n,
|
||||
@ -260,7 +312,7 @@ esp_err_t esp_secure_boot_verify_rsa_signature_block(const ets_secure_boot_signa
|
||||
goto exit;
|
||||
}
|
||||
|
||||
ret = mbedtls_rsa_rsassa_pss_verify( &pk, mbedtls_ctr_drbg_random, &ctr_drbg, MBEDTLS_RSA_PUBLIC, MBEDTLS_MD_SHA256, 32,
|
||||
ret = mbedtls_rsa_rsassa_pss_verify( &pk, mbedtls_ctr_drbg_random, &ctr_drbg, MBEDTLS_RSA_PUBLIC, MBEDTLS_MD_SHA256, DIGEST_LEN,
|
||||
sig_block->block[i].image_digest, sig_be);
|
||||
if (ret != 0) {
|
||||
ESP_LOGE(TAG, "Failed mbedtls_rsa_rsassa_pss_verify, err: %d", ret);
|
||||
@ -276,6 +328,10 @@ esp_err_t esp_secure_boot_verify_rsa_signature_block(const ets_secure_boot_signa
|
||||
|
||||
free(sig_be);
|
||||
free(buf);
|
||||
return (!ret) ? ESP_OK : ESP_ERR_IMAGE_INVALID;
|
||||
#if CONFIG_IDF_TARGET_ESP32
|
||||
return (ret != 0) ? ESP_ERR_IMAGE_INVALID: ESP_OK;
|
||||
#elif CONFIG_IDF_TARGET_ESP32S2
|
||||
return (ret != 0 || match == false) ? ESP_ERR_IMAGE_INVALID: ESP_OK;
|
||||
#endif /* CONFIG_IDF_TARGET_ESP32 */
|
||||
}
|
||||
#endif
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user