| #!/usr/bin/env python3 |
| # |
| # Copyright (c) 2022 Project CHIP Authors |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| # |
| |
| from os.path import exists |
| import os |
| import sys |
| import json |
| import jsonschema |
| import secrets |
| import argparse |
| import subprocess |
| import logging as log |
| import base64 |
| from collections import namedtuple |
| from cryptography.hazmat.backends import default_backend |
| from cryptography.hazmat.primitives.serialization import load_der_private_key |
| |
| # A user can not change the factory data version and must be coherent with |
| # the factory data version set in the nRF Connect platform Kconfig file (CHIP_FACTORY_DATA_VERSION). |
| FACTORY_DATA_VERSION = 1 |
| |
| MATTER_ROOT = os.path.dirname(os.path.realpath(__file__))[:-len("/scripts/tools/nrfconnect")] |
| HEX_PREFIX = "hex:" |
| PUB_KEY_PREFIX = b'\x04' |
| INVALID_PASSCODES = [00000000, 11111111, 22222222, 33333333, 44444444, |
| 55555555, 66666666, 77777777, 88888888, 99999999, 12345678, 87654321] |
| |
| |
| def get_raw_private_key_der(der_file: str, password: str): |
| """ Split given der file to get separated key pair consisting of public and private keys. |
| |
| Args: |
| der_file (str): Path to .der file containing public and private keys |
| password (str): Password to decrypt Keys. It can be None, and then KEY is not encrypted. |
| |
| Returns: |
| hex string: return a hex string containing extracted and decrypted private KEY from given .der file. |
| """ |
| try: |
| with open(der_file, 'rb') as file: |
| key_data = file.read() |
| if password is None: |
| log.warning("KEY password has not been provided. It means that DAC key is not encrypted.") |
| keys = load_der_private_key(key_data, password, backend=default_backend()) |
| private_key = keys.private_numbers().private_value.to_bytes(32, byteorder='big') |
| |
| return private_key |
| |
| except IOError or ValueError: |
| return None |
| |
| |
| def gen_test_certs(chip_cert_exe: str, |
| output: str, |
| vendor_id: int, |
| product_id: int, |
| device_name: str, |
| generate_cd: bool = False, |
| cd_type: int = 1, |
| paa_cert_path: str = None, |
| paa_key_path: str = None): |
| """ |
| Generate Matter certificates according to given Vendor ID and Product ID using the chip-cert executable. |
| To use own Product Attestation Authority certificate provide paa_cert_path and paa_key_path arguments. |
| Without providing these arguments a PAA certificate will be get from /credentials/test/attestation directory |
| in the Matter repository. |
| |
| Args: |
| chip_cert_exe (str): path to chip-cert executable |
| output (str): output path to store a newly generated certificates (CD, DAC, PAI) |
| vendor_id (int): an identification number specific to Vendor |
| product_id (int): an identification number specific to Product |
| device_name (str): human-readable device name |
| generate_cd (bool, optional): Generate Certificate Declaration and store it in thee output directory. Defaults to False. |
| paa_cert_path (str, optional): provide PAA certification path. Defaults to None - a path will be set to /credentials/test/attestation directory. |
| paa_key_path (str, optional): provide PAA key path. Defaults to None - a path will be set to /credentials/test/attestation directory. |
| |
| Returns: |
| dictionary: ["PAI_CERT": (str)<path to PAI cert .der file>, |
| "DAC_CERT": (str)<path to DAC cert .der file>, |
| "DAC_KEY": (str)<path to DAC key .der file>] |
| """ |
| |
| CD_PATH = MATTER_ROOT + "/credentials/test/certification-declaration/Chip-Test-CD-Signing-Cert.pem" |
| CD_KEY_PATH = MATTER_ROOT + "/credentials/test/certification-declaration/Chip-Test-CD-Signing-Key.pem" |
| PAA_PATH = paa_cert_path if paa_cert_path != None else MATTER_ROOT + "/credentials/test/attestation/Chip-Test-PAA-NoVID-Cert.pem" |
| PAA_KEY_PATH = paa_key_path if paa_key_path != None else MATTER_ROOT + "/credentials/test/attestation/Chip-Test-PAA-NoVID-Key.pem" |
| |
| attestation_certs = namedtuple("attestation_certs", ["dac_cert", "dac_key", "pai_cert"]) |
| |
| log.info("Generating new certificates using chip-cert...") |
| |
| if generate_cd: |
| # generate Certification Declaration |
| cmd = [chip_cert_exe, "gen-cd", |
| "--key", CD_KEY_PATH, |
| "--cert", CD_PATH, |
| "--out", output + "/CD.der", |
| "--format-version", "1", |
| "--vendor-id", hex(vendor_id), |
| "--product-id", hex(product_id), |
| "--device-type-id", "0", |
| "--certificate-id", "FFFFFFFFFFFFFFFFFFF", |
| "--security-level", "0", |
| "--security-info", "0", |
| "--certification-type", str(cd_type), |
| "--version-number", "0xFFFF", |
| ] |
| subprocess.run(cmd) |
| |
| new_certificates = {"PAI_CERT": output + "/PAI_cert", |
| "PAI_KEY": output + "/PAI_key", |
| "DAC_CERT": output + "/DAC_cert", |
| "DAC_KEY": output + "/DAC_key" |
| } |
| |
| # generate PAI |
| cmd = [chip_cert_exe, "gen-att-cert", |
| "-t", "i", |
| "-c", device_name, |
| "-V", hex(vendor_id), |
| "-C", PAA_PATH, |
| "-K", PAA_KEY_PATH, |
| "-o", new_certificates["PAI_CERT"] + ".pem", |
| "-O", new_certificates["PAI_KEY"] + ".pem", |
| "-l", str(10000), |
| ] |
| subprocess.run(cmd) |
| |
| # generate DAC |
| cmd = [chip_cert_exe, "gen-att-cert", |
| "-t", "d", |
| "-c", device_name, |
| "-V", hex(vendor_id), |
| "-P", hex(product_id), |
| "-C", new_certificates["PAI_CERT"] + ".pem", |
| "-K", new_certificates["PAI_KEY"] + ".pem", |
| "-o", new_certificates["DAC_CERT"] + ".pem", |
| "-O", new_certificates["DAC_KEY"] + ".pem", |
| "-l", str(10000), |
| ] |
| subprocess.run(cmd) |
| |
| # convert to .der files |
| for cert_k, cert_v in new_certificates.items(): |
| action_type = "convert-cert" if cert_k.find("CERT") != -1 else "convert-key" |
| log.info(cert_v + ".der") |
| cmd = [chip_cert_exe, action_type, |
| cert_v + ".pem", |
| cert_v + ".der", |
| "--x509-der", |
| ] |
| subprocess.run(cmd) |
| |
| return attestation_certs(new_certificates["DAC_CERT"] + ".der", |
| new_certificates["DAC_KEY"] + ".der", |
| new_certificates["PAI_CERT"] + ".der") |
| |
| |
| def gen_spake2p_verifier(passcode: int, it: int, salt: bytes) -> str: |
| """ Generate Spake2+ verifier using SPAKE2+ Python Tool |
| |
| Args: |
| passcode (int): Pairing passcode using in Spake2+ |
| it (int): Iteration counter for Spake2+ verifier generation |
| salt (str): Salt used to generate Spake2+ verifier |
| |
| Returns: |
| verifier encoded in Base64 |
| """ |
| |
| cmd = [ |
| os.path.join(MATTER_ROOT, 'scripts/tools/spake2p/spake2p.py'), 'gen-verifier', |
| '--passcode', str(passcode), |
| '--salt', base64.b64encode(salt).decode('ascii'), |
| '--iteration-count', str(it), |
| ] |
| return subprocess.check_output(cmd) |
| |
| |
| class FactoryDataGenerator: |
| """ |
| Class to generate factory data from given arguments and generate a JSON file |
| |
| """ |
| |
| def __init__(self, arguments) -> None: |
| """ |
| Args: |
| arguments (any):All input arguments parsed using ArgParse |
| """ |
| self._args = arguments |
| self._factory_data = list() |
| self._user_data = dict() |
| |
| try: |
| self._validate_args() |
| except AssertionError as e: |
| log.error(e) |
| sys.exit(-1) |
| |
| def _validate_args(self): |
| if self._args.user: |
| try: |
| self._user_data = json.loads(self._args.user) |
| except json.decoder.JSONDecodeError as e: |
| raise AssertionError("Provided wrong user data, this is not a JSON format! {}".format(e)) |
| assert self._args.spake2_verifier or self._args.passcode, \ |
| "Cannot find Spake2+ verifier, to generate a new one please provide passcode (--passcode)" |
| assert (self._args.chip_cert_path or (self._args.dac_cert and self._args.pai_cert and self._args.dac_key)), \ |
| "Cannot find paths to DAC or PAI certificates .der files. To generate a new ones please provide a path to chip-cert executable (--chip_cert_path)" |
| assert self._args.output.endswith(".json"), \ |
| "Output path doesn't contain .json file path. ({})".format(self._args.output) |
| assert not (self._args.passcode in INVALID_PASSCODES), \ |
| "Provided invalid passcode!" |
| |
| def generate_json(self): |
| """ |
| This function generates JSON data, .json file and validates it. |
| |
| To validate generated JSON data a scheme must be provided within script's arguments. |
| |
| - In the first part, if the rotating device id unique id has been not provided |
| as an argument, it will be created. |
| - If user-provided passcode and Spake2+ verifier have been not provided |
| as an argument, it will be created using an external script |
| - Passcode is not stored in JSON by default. To store it for debugging purposes, add --include_passcode argument. |
| - Validating output JSON is not mandatory, but highly recommended. |
| |
| """ |
| # generate missing data if needed |
| if not self._args.rd_uid: |
| if self._args.generate_rd_uid: |
| rd_uid = self._generate_rotating_device_uid() |
| else: |
| # rotating device ID unique ID was not provided, so do not store it in factory data. |
| rd_uid = None |
| else: |
| rd_uid = HEX_PREFIX + self._args.rd_uid |
| |
| if not self._args.spake2_verifier: |
| spake_2_verifier = self._generate_spake2_verifier() |
| else: |
| spake_2_verifier = self._args.spake2_verifier |
| |
| # convert salt to bytestring to be coherent with Spake2+ verifier type |
| spake_2_salt = self._args.spake2_salt |
| |
| if self._args.chip_cert_path: |
| certs = gen_test_certs(self._args.chip_cert_path, |
| self._args.output[:self._args.output.rfind("/")], |
| self._args.vendor_id, |
| self._args.product_id, |
| self._args.vendor_name + "_" + self._args.product_name, |
| self._args.gen_cd, |
| self._args.cd_type, |
| self._args.paa_cert, |
| self._args.paa_key) |
| dac_cert = certs.dac_cert |
| pai_cert = certs.pai_cert |
| dac_key = certs.dac_key |
| else: |
| dac_cert = self._args.dac_cert |
| dac_key = self._args.dac_key |
| pai_cert = self._args.pai_cert |
| |
| # try to read DAC public and private keys |
| dac_priv_key = get_raw_private_key_der(dac_key, self._args.dac_key_password) |
| if dac_priv_key is None: |
| log.error("Cannot read DAC keys from : {}".format(dac_key)) |
| sys.exit(-1) |
| |
| try: |
| json_file = open(self._args.output, "w+") |
| except FileNotFoundError: |
| print("Cannot create JSON file in this location: {}".format(self._args.output)) |
| sys.exit(-1) |
| with json_file: |
| # serialize data |
| self._add_entry("version", FACTORY_DATA_VERSION) |
| self._add_entry("sn", self._args.sn) |
| self._add_entry("vendor_id", self._args.vendor_id) |
| self._add_entry("product_id", self._args.product_id) |
| self._add_entry("vendor_name", self._args.vendor_name) |
| self._add_entry("product_name", self._args.product_name) |
| self._add_entry("product_label", self._args.product_label) |
| self._add_entry("product_url", self._args.product_url) |
| self._add_entry("part_number", self._args.part_number) |
| self._add_entry("date", self._args.date) |
| self._add_entry("hw_ver", self._args.hw_ver) |
| self._add_entry("hw_ver_str", self._args.hw_ver_str) |
| self._add_entry("dac_cert", self._process_der(dac_cert)) |
| self._add_entry("dac_key", dac_priv_key) |
| self._add_entry("pai_cert", self._process_der(pai_cert)) |
| if self._args.include_passcode: |
| self._add_entry("passcode", self._args.passcode) |
| self._add_entry("spake2_it", self._args.spake2_it) |
| self._add_entry("spake2_salt", spake_2_salt) |
| self._add_entry("spake2_verifier", spake_2_verifier) |
| self._add_entry("discriminator", self._args.discriminator) |
| if rd_uid: |
| self._add_entry("rd_uid", rd_uid) |
| if self._args.enable_key: |
| self._add_entry("enable_key", HEX_PREFIX + self._args.enable_key) |
| if self._args.user: |
| self._add_entry("user", self._user_data) |
| |
| factory_data_dict = dict(self._factory_data) |
| |
| json_object = json.dumps(factory_data_dict) |
| is_json_valid = True |
| |
| if self._args.schema: |
| is_json_valid = self._validate_output_json(json_object) |
| else: |
| log.warning("JSON Schema file has not been provided, the output file can be wrong. Be aware of that.") |
| try: |
| if is_json_valid: |
| json_file.write(json_object) |
| except IOError as e: |
| log.error("Cannot save output file into directory: {}".format(self._args.output)) |
| |
| def _add_entry(self, name: str, value: any): |
| """ Add single entry to list of tuples ("key", "value") """ |
| if(isinstance(value, bytes) or isinstance(value, bytearray)): |
| value = HEX_PREFIX + value.hex() |
| if value or (isinstance(value, int) and value == 0): |
| log.debug("Adding entry '{}' with size {} and type {}".format(name, sys.getsizeof(value), type(value))) |
| self._factory_data.append((name, value)) |
| |
| def _generate_spake2_verifier(self): |
| """ If verifier has not been provided in arguments list it should be generated via external script """ |
| return base64.b64decode(gen_spake2p_verifier(self._args.passcode, self._args.spake2_it, self._args.spake2_salt)) |
| |
| def _generate_rotating_device_uid(self): |
| """ If rotating device unique ID has not been provided it should be generated """ |
| log.warning("Cannot find rotating device UID in provided arguments list. A new one will be generated.") |
| rdu = secrets.token_bytes(16) |
| log.info("\n\nThe new rotate device UID: {}\n".format(rdu.hex())) |
| return rdu |
| |
| def _validate_output_json(self, output_json: str): |
| """ |
| Validate output JSON data with provided .scheme file |
| This function will raise error if JSON does not match schema. |
| |
| """ |
| try: |
| with open(self._args.schema) as schema_file: |
| log.info("Validating JSON with schema...") |
| schema = json.loads(schema_file.read()) |
| validator = jsonschema.Draft202012Validator(schema=schema) |
| validator.validate(instance=json.loads(output_json)) |
| except IOError as e: |
| log.error("Provided JSON schema file is wrong: {}".format(self._args.schema)) |
| return False |
| else: |
| log.info("Validate OK") |
| return True |
| |
| def _process_der(self, path: str): |
| log.debug("Processing der file...") |
| try: |
| with open(path, 'rb') as f: |
| data = f.read() |
| return data |
| except IOError as e: |
| log.error(e) |
| raise e |
| |
| |
| def main(): |
| parser = argparse.ArgumentParser(description="NrfConnect Factory Data NVS generator tool") |
| |
| def allow_any_int(i): return int(i, 0) |
| def base64_str(s): return base64.b64decode(s) |
| |
| mandatory_arguments = parser.add_argument_group("Mandatory keys", "These arguments must be provided to generate JSON file") |
| optional_arguments = parser.add_argument_group( |
| "Optional keys", "These arguments are optional and they depend on the user-purpose") |
| parser.add_argument("-s", "--schema", type=str, |
| help="JSON schema file to validate JSON output data") |
| parser.add_argument("-o", "--output", type=str, required=True, |
| help="Output path to store .json file, e.g. my_dir/output.json") |
| parser.add_argument("-v", "--verbose", action="store_true", |
| help="Run this script with DEBUG logging level") |
| parser.add_argument("--include_passcode", action="store_true", |
| help="Include passcode in factory data. By default, it is used only for generating Spake2+ verifier.") |
| parser.add_argument("--overwrite", action="store_true", |
| help="If output JSON file exist this argument allows to generate new factory data and overwrite it.") |
| # Json known-keys values |
| # mandatory keys |
| mandatory_arguments.add_argument("--sn", type=str, required=True, |
| help="[ascii string] Serial number of a device which can be used to identify \ |
| the serial number field in the Matter certificate structure. \ |
| Maximum length of serial number is 20 bytes. \ |
| Strings longer than 20 bytes will be declined in script") |
| mandatory_arguments.add_argument("--vendor_id", type=allow_any_int, |
| help="[int | hex int] Provide Vendor Identification Number") |
| mandatory_arguments.add_argument("--product_id", type=allow_any_int, |
| help="[int | hex int] Provide Product Identification Number") |
| mandatory_arguments.add_argument("--vendor_name", type=str, |
| help="[string] provide human-readable vendor name") |
| mandatory_arguments.add_argument("--product_name", type=str, |
| help="[string] provide human-readable product name") |
| mandatory_arguments.add_argument("--date", type=str, required=True, |
| help="[ascii string] Provide manufacturing date \ |
| A manufacturing date specifies the date that the Node was manufactured. \ |
| Used format for providing a manufacturing date is ISO 8601 e.g. YYYY-MM-DD.") |
| mandatory_arguments.add_argument("--hw_ver", type=allow_any_int, required=True, |
| help="[int | hex int] Provide hardware version in int format.") |
| mandatory_arguments.add_argument("--hw_ver_str", type=str, required=True, |
| help="[ascii string] Provide hardware version in string format.") |
| mandatory_arguments.add_argument("--spake2_it", type=allow_any_int, required=True, |
| help="[int | hex int] Provide Spake2+ iteration count.") |
| mandatory_arguments.add_argument("--spake2_salt", type=base64_str, required=True, |
| help="[base64 string] Provide Spake2+ salt.") |
| mandatory_arguments.add_argument("--discriminator", type=allow_any_int, required=True, |
| help="[int] Provide BLE pairing discriminator. \ |
| A 12-bit value matching the field of the same name in \ |
| the setup code. Discriminator is used during a discovery process.") |
| |
| # optional keys |
| optional_arguments.add_argument("--product_url", type=str, |
| help="[string] provide link to product-specific web page") |
| optional_arguments.add_argument("--product_label", type=str, |
| help="[string] provide human-readable product label") |
| optional_arguments.add_argument("--part_number", type=str, |
| help="[string] provide human-readable product number") |
| optional_arguments.add_argument("--chip_cert_path", type=str, |
| help="Generate DAC and PAI certificates instead giving a path to .der files. This option requires a path to chip-cert executable." |
| "By default you can find chip-cert in connectedhomeip/src/tools/chip-cert directory and build it there.") |
| optional_arguments.add_argument("--dac_cert", type=str, |
| help="[.der] Provide the path to .der file containing DAC certificate.") |
| optional_arguments.add_argument("--dac_key", type=str, |
| help="[.der] Provide the path to .der file containing DAC keys.") |
| optional_arguments.add_argument("--generate_rd_uid", action="store_true", |
| help="Generate a new rotating device unique ID, print it out to console output and store it in factory data.") |
| optional_arguments.add_argument("--dac_key_password", type=str, |
| help="Provide a password to decode dac key. If dac key is not encrypted do not provide this argument.") |
| optional_arguments.add_argument("--pai_cert", type=str, |
| help="[.der] Provide the path to .der file containing PAI certificate.") |
| optional_arguments.add_argument("--rd_uid", type=str, |
| help="[hex string] [128-bit hex-encoded] Provide the rotating device unique ID. If this argument is not provided a new rotating device id unique id will be generated.") |
| optional_arguments.add_argument("--passcode", type=allow_any_int, |
| help="[int | hex] Default PASE session passcode. (This is mandatory to generate Spake2+ verifier).") |
| optional_arguments.add_argument("--spake2_verifier", type=base64_str, |
| help="[base64 string] Provide Spake2+ verifier without generating it.") |
| optional_arguments.add_argument("--enable_key", type=str, |
| help="[hex string] [128-bit hex-encoded] The Enable Key is a 128-bit value that triggers manufacturer-specific action while invoking the TestEventTrigger Command." |
| "This value is used during Certification Tests, and should not be present on production devices.") |
| optional_arguments.add_argument("--user", type=str, |
| help="[string] Provide additional user-specific keys in JSON format: {'name_1': 'value_1', 'name_2': 'value_2', ... 'name_n', 'value_n'}.") |
| optional_arguments.add_argument("--gen_cd", action="store_true", default=False, |
| help="Generate a new Certificate Declaration in .der format according to used Vendor ID and Product ID. This certificate will not be included to the factory data.") |
| optional_arguments.add_argument("--cd_type", type=int, default=1, |
| help="[int] Type of generated Certification Declaration: 0 - development, 1 - provisional, 2 - official") |
| optional_arguments.add_argument("--paa_cert", type=str, |
| help="Provide a path to the Product Attestation Authority (PAA) certificate to generate the PAI certificate. Without providing it, a testing PAA stored in the Matter repository will be used.") |
| optional_arguments.add_argument("--paa_key", type=str, |
| help="Provide a path to the Product Attestation Authority (PAA) key to generate the PAI certificate. Without providing it, a testing PAA key stored in the Matter repository will be used.") |
| args = parser.parse_args() |
| |
| if args.verbose: |
| log.basicConfig(format='[%(asctime)s][%(levelname)s] %(message)s', level=log.DEBUG) |
| else: |
| log.basicConfig(format='[%(levelname)s] %(message)s', level=log.INFO) |
| |
| # check if json file already exist |
| if(exists(args.output) and not args.overwrite): |
| log.error("Output file: {} already exist, to create a new one add argument '--overwrite'. By default overwriting is disabled".format(args.output)) |
| return |
| |
| generator = FactoryDataGenerator(args) |
| generator.generate_json() |
| |
| |
| if __name__ == "__main__": |
| main() |
