fix(secure_boot): Fix SB verification failure when sig block and key digest mismatch

- Secure boot V2 verification failed when multiple keys are used to sign the bootloader
  and the application is signed with a key other than the first key that is used to
  sign the bootloader.
- The issue was introduced as a regression from the commit `ff16ce43`.
- Added a QEMU test for recreating the issue.
- Made SECURE_BOOT_FLASH_BOOTLOADER_DEFAULT independent of SECURE_BOOT_BUILD_SIGNED_BINARIES.

components/bootloader/Kconfig.projbuild

@@ -764,7 +764,7 @@ menu "Security features"
 
     config SECURE_BOOT_FLASH_BOOTLOADER_DEFAULT
         bool "Flash bootloader along with other artifacts when using the default flash command"
-        depends on SECURE_BOOT_V2_ENABLED && SECURE_BOOT_BUILD_SIGNED_BINARIES
+        depends on SECURE_BOOT_V2_ENABLED
         default n
         help
             When Secure Boot V2 is enabled, by default the bootloader is not flashed along with other artifacts

components/bootloader_support/src/secure_boot_v2/secure_boot_signatures_bootloader.c

@@ -154,13 +154,12 @@ esp_err_t esp_secure_boot_verify_sbv2_signature_block(const ets_secure_boot_sign
     ets_secure_boot_key_digests_t trusted_key_digests = {0};
     bool valid_sig_blk = false;
     for (unsigned i = 0; i < SECURE_BOOT_NUM_BLOCKS; i++) {
+        trusted_key_digests.key_digests[i] = &trusted.key_digests[i];
         if (sig_block->block[i].version != ESP_SECURE_BOOT_SCHEME) {
             ESP_LOGD(TAG, "%s signing scheme selected but signature block %d generated for %s scheme", esp_secure_boot_get_scheme_name(ESP_SECURE_BOOT_SCHEME), i, esp_secure_boot_get_scheme_name(sig_block->block[i].version));
-            continue;
         } else {
             valid_sig_blk = true;
         }
-        trusted_key_digests.key_digests[i] = &trusted.key_digests[i];
     }
     if (valid_sig_blk != true) {
         ESP_LOGE(TAG, "No signature block generated for valid scheme");

tools/test_apps/security/.build-test-rules.yml

@@ -2,7 +2,7 @@
 
 tools/test_apps/security/secure_boot:
   disable:
-    - if: IDF_ENV_FPGA != 1
+    - if: IDF_ENV_FPGA != 1 and CONFIG_NAME != "qemu"
       reason: the test can only run on an FPGA as efuses need to be reset during the test.
 
 tools/test_apps/security/signed_app_no_secure_boot:

tools/test_apps/security/secure_boot/main/CMakeLists.txt

@@ -7,3 +7,38 @@ endif()
 
 idf_component_register(SRCS "${main_src}" INCLUDE_DIRS ".")
 target_compile_options(${COMPONENT_LIB} PRIVATE "-Wno-format")
+
+if(CONFIG_EXAMPLE_TARGET_QEMU)
+    set(bootloader_unsigned_bin "bootloader-unsigned.bin")
+    set(app_unsigned_bin "${PROJECT_BIN}-unsigned.bin")
+
+    add_custom_target(sign_bootloader ALL
+        COMMAND ${CMAKE_COMMAND} -E copy "${CMAKE_BINARY_DIR}/bootloader/bootloader.bin"
+        "${CMAKE_BINARY_DIR}/bootloader/${bootloader_unsigned_bin}"
+        COMMAND ${ESPSECUREPY} sign_data --version 2 --keyfile
+        ${PROJECT_DIR}/test/secure_boot_signing_key0.pem
+        ${PROJECT_DIR}/test/secure_boot_signing_key1.pem
+        ${PROJECT_DIR}/test/secure_boot_signing_key2.pem
+        -o "${CMAKE_BINARY_DIR}/bootloader/bootloader.bin"
+        "${CMAKE_BINARY_DIR}/bootloader/${bootloader_unsigned_bin}"
+        COMMAND ${CMAKE_COMMAND} -E echo "Generated signed binary image ${CMAKE_BINARY_DIR}/bootloader/bootloader.bin"
+        "from ${CMAKE_BINARY_DIR}/bootloader/${bootloader_unsigned_bin}"
+        VERBATIM
+        COMMENT "Generated the test-specific signed bootloader")
+
+    add_dependencies(sign_bootloader bootloader)
+
+    add_custom_target(sign_app ALL
+        COMMAND ${CMAKE_COMMAND} -E copy "${CMAKE_BINARY_DIR}/${PROJECT_BIN}"
+        "${CMAKE_BINARY_DIR}/${app_unsigned_bin}"
+        COMMAND ${ESPSECUREPY} sign_data --version 2 --keyfile
+        ${PROJECT_DIR}/test/secure_boot_signing_key1.pem
+        -o "${CMAKE_BINARY_DIR}/${PROJECT_BIN}"
+        "${CMAKE_BINARY_DIR}/${app_unsigned_bin}"
+        COMMAND ${CMAKE_COMMAND} -E echo "Generated signed binary image ${CMAKE_BINARY_DIR}/${PROJECT_BIN}"
+        "from ${CMAKE_BINARY_DIR}/${app_unsigned_bin}"
+        VERBATIM
+        COMMENT "Generated the test-specific signed application")
+
+    add_dependencies(sign_app app)
+endif()

tools/test_apps/security/secure_boot/main/Kconfig.projbuild

@@ -0,0 +1,9 @@
+menu "Example Configuration"
+
+    config EXAMPLE_TARGET_QEMU
+        bool "Run the example tests for target QEMU"
+        default n
+        help
+            Run the example tests for target QEMU
+
+endmenu

tools/test_apps/security/secure_boot/main/secure_boot_main.c

@@ -76,4 +76,13 @@ static void example_secure_boot_status(void)
     } else {
         ESP_LOGI(TAG, "Secure Boot not enabled. Enable Secure Boot in menuconfig, build & flash again.");
     }
+
+#if CONFIG_EXAMPLE_TARGET_QEMU
+    for (int i = 5; i >= 0; i--) {
+        ESP_LOGI(TAG, "Restarting in %d seconds...", i);
+        vTaskDelay(1000 / portTICK_PERIOD_MS);
+    }
+    ESP_LOGI(TAG, "Restarting now.");
+    esp_restart();
+#endif /* CONFIG_EXAMPLE_TARGET_QEMU */
 }

tools/test_apps/security/secure_boot/pytest_secure_boot.py

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2022-2024 Espressif Systems (Shanghai) CO LTD
+# SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
 # SPDX-License-Identifier: Unlicense OR CC0-1.0
 import os
 import struct
@@ -91,6 +91,36 @@ def test_examples_security_secure_boot(dut: Dut) -> None:
     dut.burn_wafer_version()
 
 
+# Test secure boot flow.
+# Correctly signed bootloader + correctly signed app should work
+@pytest.mark.host_test
+@pytest.mark.qemu
+@pytest.mark.esp32c3
+@pytest.mark.parametrize(
+    'qemu_extra_args',
+    [
+        f'-drive file={os.path.join(os.path.dirname(__file__), "test", "esp32c3_efuses.bin")},if=none,format=raw,id=efuse '
+        '-global driver=nvram.esp32c3.efuse,property=drive,value=efuse '
+        '-global driver=timer.esp32c3.timg,property=wdt_disable,value=true',
+    ],
+    indirect=True,
+)
+@pytest.mark.parametrize('config', ['qemu'], indirect=True)
+def test_examples_security_secure_boot_qemu(dut: Dut) -> None:
+    try:
+        dut.expect('Secure Boot is enabled', timeout=10)
+        dut.expect('Restarting now.', timeout=10)
+        dut.expect('Secure Boot is enabled', timeout=10)
+
+    finally:
+        # the above example test burns the efuses, and hence the efuses file which the
+        # qemu uses to emulate the efuses, "esp32c3_efuses.bin", gets modified.
+        # Thus, restore the efuses file values back to the default ESP32C3 efuses values.
+        with open(os.path.join(os.path.dirname(__file__), 'test', 'esp32c3_efuses.bin'), 'wb') as efuse_file:
+            esp32c3_efuses = '0' * 77 + 'c' + '0' * 1970
+            efuse_file.write(bytearray.fromhex(esp32c3_efuses))
+
+
 # Test efuse key index and key block combination.
 # Any key index can be written to any key block and should work
 @pytest.mark.esp32c3

tools/test_apps/security/secure_boot/sdkconfig.ci.qemu

@@ -0,0 +1,7 @@
+CONFIG_IDF_TARGET="esp32c3"
+
+CONFIG_SECURE_BOOT=y
+CONFIG_SECURE_BOOT_BUILD_SIGNED_BINARIES=n
+CONFIG_SECURE_BOOT_FLASH_BOOTLOADER_DEFAULT=y
+
+CONFIG_EXAMPLE_TARGET_QEMU=y

tools/test_apps/security/secure_boot/test/secure_boot_signing_key0.pem

@@ -0,0 +1,39 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

tools/test_apps/security/secure_boot/test/secure_boot_signing_key1.pem

@@ -0,0 +1,39 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIG4wIBAAKCAYEAn9mfX+24efn7xCnI2YlpBJONsht1SOLQTQQ7xC8JGVxHwJ6f
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+-----END RSA PRIVATE KEY-----

tools/test_apps/security/secure_boot/test/secure_boot_signing_key2.pem

@@ -0,0 +1,39 @@
+-----BEGIN RSA PRIVATE KEY-----
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+8rb++J4jVraHo2mWERjy4+KrfifKgHVT+buDNd3f/my8zTECgcEAs/v5UXrgmPTW
+Zk6c3gBaXzsdaFjiPPB87JVypufzqoQ8kVqrAcUUUjXwQ2Bl2hAmmgwa4xAMBITP
+Z33gs8gilYGTrCt/r91Zgo4tyM9QQM7kVskxY3o42GeRgD1+WNsOpEEuz2XxAEEc
+CqY1xlNkAeqHis8k5GyFTxCu00eagunt/BPRq8iKtgBSVplEQisqAjM8WaEHKYp0
+3Eb6/fKw0va5ABMiwuiuSUtv4GAkok/DZC4pOgwCYICX9kjuuFXp
+-----END RSA PRIVATE KEY-----