mirror of
https://github.com/espressif/esp-idf.git
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199 lines
7.1 KiB
Python
199 lines
7.1 KiB
Python
# SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
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# SPDX-License-Identifier: Unlicense OR CC0-1.0
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from __future__ import print_function
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import os
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import struct
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import zlib
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import pytest
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from pytest_embedded import Dut
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# To prepare a runner for these tests,
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# 1. Connect an FPGA with C3 image
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# 2. Use a COM port for programming and export it as ESPPORT
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# e.g export ESPPORT=/dev/ttyUSB0
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# 3. Use another COM port for resetting efuses and connect its DTR pin to efuse reset pin on the FPGA board.
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# Export it as EFUSEPORT
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# e.g export EFUSEPORT=/dev/ttyUSB1
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# 4. Run these tests
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def corrupt_signature(signed_bootloader, seed=0, corrupt_sig=True, corrupt_crc=False, corrupt_single_block=None):
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# type: (bytes, int, bool, bool, int) -> bytes
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image = signed_bootloader[:-4096]
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signature = signed_bootloader[-4096:]
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sig_blocks = (signature[0:1216], signature[1216:2432], signature[2432:3648])
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new_blocks = tuple(corrupt_sig_block(s, seed, corrupt_sig, corrupt_crc) for s in sig_blocks)
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# if corrupt_single_block is None, corrupt all blocks
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# otherwise, only corrupt the one with that index set
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corr_sig_blocks = tuple(new_blocks[n] if corrupt_single_block in [None, n] else sig_blocks[n] for n in range(3))
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return image + b''.join(corr_sig_blocks) + signature[3648:]
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def corrupt_sig_block(sig_block, seed=0, corrupt_sig=True, corrupt_crc=False):
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# type: (bytes, int, bool, bool) -> bytes
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assert len(sig_block) == 1216
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magic = sig_block[0]
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assert magic in [0xe7, 0xff]
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if magic != 0xe7:
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return sig_block # not valid
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data = sig_block[:812]
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new_sig = sig = sig_block[812:1196]
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crc = sig_block[1196:1200]
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padding = sig_block[1200:1216]
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if corrupt_sig:
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corrupt_idx = seed % len(sig)
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corrupt_delta = zlib.crc32(bytes(seed)) & 0xFF
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if corrupt_delta == 0:
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corrupt_delta = 1
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new_byte = sig[corrupt_idx] ^ corrupt_delta
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new_sig = sig[0:corrupt_idx] + bytes([new_byte]) + sig[corrupt_idx + 1:]
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assert new_sig != sig
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if not corrupt_crc:
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crc = struct.pack('<I', zlib.crc32(data + new_sig) & 0xffffffff)
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else:
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crc = struct.pack('<I', zlib.crc32(crc))
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result = data + new_sig + crc + padding
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assert len(result) == len(sig_block)
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return result
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def dut_start_secure_app(dut: Dut) -> None:
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dut.serial.erase_flash()
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dut.serial.reset_efuses()
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dut.burn_wafer_version()
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bootloader_path = os.path.join(dut.app.binary_path, 'bootloader/bootloader.bin')
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dut.serial.bootloader_flash(bootloader_path)
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dut.serial.flash()
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# Test secure boot flow.
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# Correctly signed bootloader + correctly signed app should work
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@pytest.mark.esp32c3
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@pytest.mark.esp32s3
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def test_examples_security_secure_boot(dut: Dut) -> None:
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dut_start_secure_app(dut)
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dut.expect('Secure Boot is enabled', timeout=10)
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dut.serial.reset_efuses()
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# Test efuse key index and key block combination.
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# Any key index can be written to any key block and should work
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@pytest.mark.esp32c3
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@pytest.mark.esp32s3
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def test_examples_security_secure_boot_key_combo(dut: Dut) -> None:
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dut_start_secure_app(dut)
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dut.expect('Secure Boot is enabled', timeout=10)
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for index in range(3):
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print(index)
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for block in range(6):
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dut.serial.reset_efuses()
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dut.burn_wafer_version()
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dut.secure_boot_burn_en_bit()
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dut.secure_boot_burn_digest('test_rsa_3072_key.pem', index, block)
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dut.expect('Secure Boot is enabled', timeout=10)
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# Test secure boot key revoke.
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# If a key is revoked, bootloader signed with that key should fail verification
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@pytest.mark.esp32c3
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@pytest.mark.esp32s3
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def test_examples_security_secure_boot_key_revoke(dut: Dut) -> None:
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dut_start_secure_app(dut)
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dut.expect('Secure Boot is enabled', timeout=10)
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for index in range(3):
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dut.serial.reset_efuses()
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dut.burn_wafer_version()
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dut.secure_boot_burn_en_bit()
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dut.serial.burn_efuse('SECURE_BOOT_KEY_REVOKE%d' % index, 1)
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dut.secure_boot_burn_digest('test_rsa_3072_key.pem', index, 0)
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dut.expect('secure boot verification failed', timeout=5)
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# Test bootloader signature corruption.
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# Corrupt one byte at a time of bootloader signature and test that the verification fails
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@pytest.mark.esp32c3
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@pytest.mark.esp32s3
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def test_examples_security_secure_boot_corrupt_bl_sig(dut: Dut) -> None:
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dut_start_secure_app(dut)
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dut.expect('Secure Boot is enabled', timeout=10)
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bootloader_bin = os.path.join(dut.app.binary_path, 'bootloader/bootloader.bin')
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with open(bootloader_bin, 'rb') as f:
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signed_bl = f.read()
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seeds = range(0, 384)
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max_seed = max(seeds)
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for seed in seeds:
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print('Case %d / %d' % (seed, max_seed))
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corrupt_bl = corrupt_signature(signed_bl, seed=seed)
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with open('corrupt_bl.bin', 'wb') as corrupt_file:
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corrupt_file.write(corrupt_bl)
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dut.serial.reset_efuses()
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dut.burn_wafer_version()
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dut.serial.bootloader_flash('corrupt_bl.bin')
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dut.secure_boot_burn_en_bit()
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dut.secure_boot_burn_digest('test_rsa_3072_key.pem', 0, 0)
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# Though the order of flashing and burning efuse would not effect the test,
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# if we flash bootlader before burning en bit, even with no_stub = True
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# it still calls run_stub() and throws an error as it fails to start stub.
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dut.expect('Signature Check Failed', timeout=10)
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# Test app signature corruption.
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# Corrupt app signature, one byte at a time, and test that the verification fails
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@pytest.mark.esp32c3
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@pytest.mark.esp32s3
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def test_examples_security_secure_boot_corrupt_app_sig(dut: Dut) -> None:
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dut_start_secure_app(dut)
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dut.expect('Secure Boot is enabled', timeout=10)
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app_bin = os.path.join(dut.app.binary_path, 'secure_boot.bin')
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with open(app_bin, 'rb') as f:
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signed_app = f.read()
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seeds = range(0, 384)
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max_seed = max(seeds)
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for seed in seeds:
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print('Case %d / %d' % (seed, max_seed))
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corrupt_app = corrupt_signature(signed_app, seed=seed)
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with open('corrupt_app.bin', 'wb') as corrupt_file:
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corrupt_file.write(corrupt_app)
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dut.serial.reset_efuses()
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dut.burn_wafer_version()
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dut.serial.app_flash('corrupt_app.bin')
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dut.secure_boot_burn_en_bit()
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dut.secure_boot_burn_digest('test_rsa_3072_key.pem', 0, 0)
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dut.expect('Signature Check Failed', timeout=10)
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dut.expect('image valid, signature bad', timeout=2)
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print('Testing invalid CRC...')
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# Valid signature but invalid CRC
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dut.serial.reset_efuses()
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dut.burn_wafer_version()
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corrupt_app = corrupt_signature(signed_app, corrupt_sig=False, corrupt_crc=True)
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with open('corrupt_app.bin', 'wb') as corrupt_file:
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corrupt_file.write(corrupt_app)
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dut.serial.app_flash('corrupt_app.bin')
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dut.secure_boot_burn_en_bit()
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dut.secure_boot_burn_digest('test_rsa_3072_key.pem', 0, 0)
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dut.expect('Sig block 0 invalid: Stored CRC ends', timeout=2)
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dut.expect('Secure boot signature verification failed', timeout=2)
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dut.expect('No bootable app partitions in the partition table', timeout=2)
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