def validate_sig(self,
to_sign,
signature,
cert_chain_der,
signed_authority=None,
extracted_image_attributes=None,
imageinfo=None):
# Check that openssl is available
try:
crypto.are_available([crypto.modules.MOD_OPENSSL])
except Exception as e:
raise RuntimeError('Cannot validate signing: ' + str(e))
# Get the hash
if extracted_image_attributes is None:
extracted_image_attributes = self._attribute_extractor(
cert_data=cert_chain_der[0],
attributes=self.signing_attributes_class()).attributes
cert_text = extracted_image_attributes.cert_text
cert_sign_algo = crypto.cert.get_sign_algo(cert_text)
use_pss = cert_sign_algo == crypto.cert.SIGN_ALGO_RSA_PSS
use_dsa = cert_sign_algo == crypto.cert.SIGN_ALGO_ECDSA
# Get the hmac params from attestation cert or hash segment
hmac_params = self.get_hmac_params_from_cert(
extracted_attributes=extracted_image_attributes)
if use_dsa:
# RSA padding mapping cannot be used to determine
# whether HMAC was used or not, so config hmac value must be used
logger.debug(
"Signer is relying on config's hmac value to determine "
"whether signature was generated using HMAC or SHA.")
if imageinfo.signing_attributes.hmac:
logger.debug(
"Signer is assuming that signature was generated using HMAC."
)
else:
logger.debug(
"Signer is assuming that signature was generated using SHA."
)
hmac_params = None
elif use_pss:
hmac_params = None
image_hash = Hasher().get_hash(
to_sign,
hmac_params=hmac_params,
sha_algo=extracted_image_attributes.hash_algorithm)
# Validate the hash
return self.validate_sig_using_hash(
image_hash,
signature,
cert_chain_der,
signed_authority=signed_authority,
extracted_image_attributes=extracted_image_attributes)
def __init__(self, imageinfo, debug_dir=None, validating=False):
# Check that crypto binaries are available
try:
crypto.are_available([crypto.modules.MOD_OPENSSL])
except Exception as e:
raise RuntimeError('Cannot proceed with encryption/decryption: ' +
str(e))
BaseEncdec.__init__(self,
imageinfo,
debug_dir=debug_dir,
validating=validating)
def __init__(self,
imageinfo,
debug_dir=None,
validating=False,
encrypted_segments_indices=None):
try:
crypto.are_available([crypto.modules.MOD_ECIESAD])
except Exception as e:
raise RuntimeError('Cannot proceed with encryption/decryption: ' +
str(e))
super(EncdecUIE2, self).__init__(
imageinfo,
debug_dir=debug_dir,
validating=validating,
encrypted_segments_indices=encrypted_segments_indices)
def validate_sig_using_hash(self,
image_hash,
signature,
cert_chain_der,
signed_authority=None,
extracted_image_attributes=None,
message_function=None):
# Check that openssl is available
try:
crypto.are_available([crypto.modules.MOD_OPENSSL])
except Exception as e:
raise RuntimeError('Cannot validate signing: ' + str(e))
if extracted_image_attributes is None:
extracted_image_attributes = self._attribute_extractor(
cert_data=cert_chain_der[0],
attributes=self.signing_attributes_class()).attributes
cert_sign_algo = crypto.cert.get_sign_algo(
extracted_image_attributes.cert_text)
use_pss = cert_sign_algo == crypto.cert.SIGN_ALGO_RSA_PSS
use_dsa = cert_sign_algo == crypto.cert.SIGN_ALGO_ECDSA
if message_function is None:
logger.info("Image is signed")
else:
logger.info(message_function(signed_authority, use_pss, use_dsa))
cert_chain_pem = []
for cert in cert_chain_der:
cert_chain_pem.append(
crypto.cert.get_cert_in_format(cert, crypto.utils.FORMAT_PEM))
attest_cert, ca_cert_chain = cert_chain_pem[0], '\n'.join(
cert_chain_pem[-(len(cert_chain_pem) - 1):])
crypto.cert.validate_cert_chain(attest_cert, ca_cert_chain)
public_key = crypto.cert.get_pubkey(attest_cert)
if use_dsa:
matches = crypto.ecdsa.verify(image_hash, public_key, signature)
else:
matches = crypto.rsa.verify(
image_hash,
public_key,
signature,
padding=crypto.rsa.RSA_PAD_PSS
if use_pss else crypto.rsa.RSA_PAD_PKCS,
hash_algo=extracted_image_attributes.hash_algorithm)
return matches
def validate_sig(self, to_sign, signature, cert_chain_der, signed_authority=None, extracted_image_attributes=None):
# Check that openssl is available
try:
crypto.are_available([crypto.modules.MOD_OPENSSL])
except Exception as e:
raise RuntimeError('Cannot validate signing: ' + str(e))
# Get the hash
if extracted_image_attributes is None:
extracted_image_attributes = AttributeExtractor(cert_data=cert_chain_der[0], hash_segment_metadata=None).attributes
cert_text = extracted_image_attributes.cert_text
use_pss = crypto.cert.get_sign_algo(cert_text) == crypto.cert.SIGN_ALGO_RSA_PSS
# Get the hmac params from attestation cert or hash segment
hmac_params = self.get_hmac_params_from_cert(extracted_attributes=extracted_image_attributes)
hash_algo = extracted_image_attributes.hash_algorithm
image_hash = Hasher().get_hash(to_sign, hmac_params=hmac_params if not use_pss else None, sha_algo=hash_algo)
# Validate the hash
return self.validate_sig_using_hash(image_hash, signature, cert_chain_der, signed_authority=signed_authority, extracted_image_attributes=extracted_image_attributes)
def sign_hash(self,
hash_to_sign,
imageinfo,
binary_to_sign=None,
debug_dir=None,
sha_algo=None,
binary_to_sign_len=None):
# Check that openssl is available
try:
crypto.are_available([crypto.modules.MOD_OPENSSL])
except Exception as e:
raise RuntimeError('Cannot sign: ' + str(e))
# abstract some of the image information
signing_attributes = imageinfo.signing_attributes
general_properties = imageinfo.general_properties
# GET OPENSSL DATA
openssl_configfile = self.openssl_info.openssl_config
openssl_attest_ca_xts = self.openssl_info.attest_ca_xts
openssl_ca_cert_xts = self.openssl_info.ca_cert_xts
# GET SIGNING ATTRIBUTE DATA
debug_val = int(signing_attributes.debug,
16) if signing_attributes.debug is not None else None
multi_serial_numbers = signing_attributes.multi_serial_numbers.serial if signing_attributes.multi_serial_numbers is not None else []
oem_id = int(signing_attributes.oem_id, 16) & 0xFFFF
model_id = int(signing_attributes.model_id, 16) & 0xFFFF
num_certs_in_certchain = general_properties.num_certs_in_certchain
app_id = int(signing_attributes.app_id,
16) if signing_attributes.app_id is not None else None
crash_dump = int(
signing_attributes.crash_dump,
16) if signing_attributes.crash_dump is not None else None
rot_en = int(signing_attributes.rot_en,
16) if signing_attributes.rot_en is not None else None
mask_soc_hw_version = int(
signing_attributes.mask_soc_hw_version,
16) if signing_attributes.mask_soc_hw_version is not None else None
in_use_soc_hw_version = signing_attributes.in_use_soc_hw_version if signing_attributes.in_use_soc_hw_version is not None else None
use_serial_number_in_signing = signing_attributes.use_serial_number_in_signing if signing_attributes.use_serial_number_in_signing is not None else None
oem_id_independent = signing_attributes.oem_id_independent if signing_attributes.oem_id_independent is not None else None
# GET CERTIFICATE INFORMATION
cert_dict = {}
cert_dict['id'] = imageinfo.cert_config
cert_dict['chip'] = self.config.metadata.chipset
cert_dict['keysize'] = general_properties.key_size
cert_dict['exponent'] = general_properties.exponent
cert_dict['mrc_index'] = general_properties.mrc_index
#TODO: Padding is not supported with ECDSA curves
cert_dict['padding'] = general_properties.rsa_padding.upper(
) if general_properties.rsa_padding else 'PKCS'
cert_dict[
'hash_algorithm'] = general_properties.hash_algorithm if general_properties.hash_algorithm else 'sha256'
# Can't use imageinfo.data_prov_basepath because MockImage can't use it
cert_dict['dp_path'] = self.config.data_provisioning.base_path
cert_dict['dsa_type'] = general_properties.dsa_type
cert_dict['ecdsa_curve'] = general_properties.ecdsa_curve
self.cert_data_object = CertData(cert_dict)
crypto_params_dict = self.cert_data_object.get_crypto_params()
# Create the attestation_certificate_key_pair
attestation_certificate_key_pair = None
# check if the root cert is using pss
# if so and we are creating a new attest cert, the attest cert should use pss
#TODO: how do we deal with this in ECDSA?
use_pss = general_properties.rsa_padding and general_properties.rsa_padding.lower(
) == 'pss'
hash_algorithm = general_properties.hash_algorithm if general_properties.hash_algorithm else 'sha256'
logger.info("Using " + ('PSS' if use_pss else 'PKCS') + " RSA padding")
root_certificate_params = crypto_params_dict[
'root_certificate_properties']
root_certificate_params_is_valid, generate_new_root_certificate = self._validate_certificate_params_dict(
root_certificate_params)
if root_certificate_params_is_valid:
if generate_new_root_certificate:
logger.info('Generating new Root certificate and a random key')
priv_key, pub_key = crypto.rsa.gen_keys(
signing_attributes.exponent, general_properties.key_size)
root_key_pair = {
'private_key': priv_key,
'public_key': pub_key
}
root_cert = crypto.cert.create_cert(
priv_key,
subject_params=root_certificate_params,
config=openssl_configfile,
self_sign=True,
hash_algo=hash_algorithm,
days=7300,
serial=1,
sign_algo=crypto.cert.SIGN_ALGO_RSA_PSS
if use_pss else crypto.cert.SIGN_ALGO_RSA_PKCS,
pad_hash_algo=hash_algorithm)
else:
logger.info(
'Using a predefined Root certificate and a predefined key')
logger.info('Key Used: ' +
root_certificate_params['private_key_path'])
logger.info('Certificate Used: ' +
root_certificate_params['certificate_path'])
root_cert, root_key_pair = self._get_certificate_and_key_pair_from_files(
root_certificate_params)
else:
logger.error(
"Root certificate params are invalid! Please check config file."
)
raise RuntimeError(
"Root certificate params are invalid! Please check config file."
)
if num_certs_in_certchain > 2:
logger.debug(
"Generating Attestation CA certificate, since certchain size is greater than 2"
)
attestation_ca_certificate_params = crypto_params_dict[
'attest_ca_certificate_properties']
attestation_ca_params_is_valid, generate_new_attestation_ca = self._validate_certificate_params_dict(
attestation_ca_certificate_params)
if attestation_ca_params_is_valid:
if generate_new_attestation_ca:
logger.info(
'Generating new Attestation CA certificate and a random key'
)
priv_key, pub_key = crypto.rsa.gen_keys(
signing_attributes.exponent,
general_properties.key_size)
attestation_ca_certificate_key_pair = {
'private_key': priv_key,
'public_key': pub_key
}
attestation_ca_certificate_req = crypto.cert.create_cert(
priv_key,
subject_params=attestation_ca_certificate_params,
config=openssl_configfile)
attestation_ca_certificate = crypto.cert.sign_cert(
attestation_ca_certificate_req,
root_cert,
root_key_pair['private_key'],
extfile=openssl_ca_cert_xts,
hash_algo=hash_algorithm,
days=7300,
serial=1,
sign_algo=crypto.cert.SIGN_ALGO_RSA_PSS
if use_pss else crypto.cert.SIGN_ALGO_RSA_PKCS,
pad_hash_algo=hash_algorithm)
else:
logger.info(
'Using a predefined Attestation CA certificate and a predefined key'
)
logger.info(
'Key Used: ' +
attestation_ca_certificate_params['private_key_path'])
logger.info(
'Certificate Used: ' +
attestation_ca_certificate_params['certificate_path'])
attestation_ca_certificate, attestation_ca_certificate_key_pair = self._get_certificate_and_key_pair_from_files(
attestation_ca_certificate_params)
else:
logger.error(
"Attestation CA certificate params are invalid! Please check config file."
)
raise RuntimeError(
"Attestation CA certificate params are invalid! Please check config file."
)
attestation_certificate_params = crypto_params_dict[
'attest_certificate_properties']
attestation_certificate_params_is_valid, generate_new_attestation_certificate = self._validate_certificate_params_dict(
attestation_certificate_params)
if attestation_certificate_params_is_valid:
if generate_new_attestation_certificate:
# TCG support
if self._is_oid_supported(signing_attributes) is True:
if self.validate_oid_from_config(
attestation_ca_certificate_params[
'certificate_path'],
signing_attributes) is False:
raise ConfigError("{0} min and max are not set correctly in configuration."\
"Signing will not continue.".format(signing_attributes.object_id.name)
)
attestation_certificate_extensions_path = self._generate_attestation_certificate_extensions(
openssl_attest_ca_xts,
signing_attributes.object_id.name,
signing_attributes.object_id.min,
signing_attributes.object_id.max)
else:
attestation_certificate_extensions_path = openssl_attest_ca_xts
# Get the binary to sign length
if binary_to_sign_len is None:
if binary_to_sign is not None:
binary_to_sign_len = len(binary_to_sign)
else:
raise RuntimeError(
'Length of binary could not be computed')
logger.info(
'Generating new Attestation certificate and a random key')
hmac_params = signerutils.get_hmac_params_from_config(
signing_attributes)
certificate_ou_sw_id = "01 " + hmac_params.sw_id_str + " SW_ID"
certificate_ou_hw_id = "02 " + hmac_params.msm_id_str + " HW_ID"
certificate_ou_oem_id = "04 " + "%0.4X" % oem_id + " OEM_ID"
certificate_ou_sw_size = "05 " + "%0.8X" % binary_to_sign_len + " SW_SIZE"
certificate_ou_model_id = "06 " + "%0.4X" % model_id + " MODEL_ID"
certificate_hash_alg = self.SHA_OU_MAP[
signing_attributes.hash_algorithm]
certificate_ou = [
certificate_ou_sw_id, certificate_ou_hw_id,
certificate_ou_oem_id, certificate_ou_sw_size,
certificate_ou_model_id, certificate_hash_alg
]
# Optional attributes
if debug_val is not None:
certificate_ou_debug_id = "03 " + "%0.16X" % debug_val + " DEBUG"
certificate_ou.append(certificate_ou_debug_id)
if app_id is not None:
certificate_app_id = "08 " + "%0.16X" % app_id + " APP_ID"
certificate_ou.append(certificate_app_id)
if crash_dump is not None:
certificate_crash_dump = "09 " + "%0.16X" % crash_dump + " CRASH_DUMP"
certificate_ou.append(certificate_crash_dump)
if rot_en is not None:
certificate_rot_en = "10 " + "%0.16X" % rot_en + " ROT_EN"
certificate_ou.append(certificate_rot_en)
if mask_soc_hw_version is not None:
certificate_mask_soc_hw_version = "12 " + "%0.4X" % mask_soc_hw_version + " MASK_SOC_HW_VERSION"
certificate_ou.append(certificate_mask_soc_hw_version)
if in_use_soc_hw_version == 1:
certificate_in_use_soc_hw_version = "13 " + "%0.4X" % in_use_soc_hw_version + " IN_USE_SOC_HW_VERSION"
certificate_ou.append(certificate_in_use_soc_hw_version)
if use_serial_number_in_signing == 1:
certificate_use_serial_number_in_signing = "14 " + "%0.4X" % use_serial_number_in_signing + " USE_SERIAL_NUMBER_IN_SIGNING"
certificate_ou.append(
certificate_use_serial_number_in_signing)
if oem_id_independent == 1:
certificate_oem_id_independent = "15 " + "%0.4X" % oem_id_independent + " OEM_ID_INDEPENDENT"
certificate_ou.append(certificate_oem_id_independent)
certificate_ou_sn_list = []
for index in xrange(0, len(multi_serial_numbers), 6):
serial_sublist = multi_serial_numbers[index:index + 6]
certificate_sn = "16"
for serial in serial_sublist:
certificate_sn += " " + serial[2:]
# fill last SN OU field with zeros
zeros = " 00000000" * (6 - len(serial_sublist))
certificate_sn += zeros
certificate_sn += " SN"
certificate_ou_sn_list.append(certificate_sn)
certificate_ou_sn_list.reverse()
certificate_ou.extend(certificate_ou_sn_list)
if 'OU' in attestation_certificate_params.keys():
if type(attestation_certificate_params['OU']) == list:
for item in attestation_certificate_params['OU']:
certificate_ou.append(item)
else:
certificate_ou.append(
attestation_certificate_params['OU'])
attestation_certificate_params['OU'] = certificate_ou
if attestation_certificate_key_pair is None:
priv_key, pub_key = crypto.rsa.gen_keys(
signing_attributes.exponent,
general_properties.key_size)
attestation_certificate_key_pair = {
'private_key': priv_key,
'public_key': pub_key
}
# Create the request
attestation_certificate_req = crypto.cert.create_cert(
attestation_certificate_key_pair['private_key'],
subject_params=attestation_certificate_params,
config=openssl_configfile)
ca_cert, ca_priv_key = (
(attestation_ca_certificate,
attestation_ca_certificate_key_pair['private_key'])
if num_certs_in_certchain > 2 else
(root_cert, root_key_pair['private_key']))
attestation_certificate = crypto.cert.sign_cert(
attestation_certificate_req,
ca_cert,
ca_priv_key,
extfile=attestation_certificate_extensions_path,
hash_algo=hash_algorithm,
days=7300,
serial=1,
sign_algo=crypto.cert.SIGN_ALGO_RSA_PSS
if use_pss else crypto.cert.SIGN_ALGO_RSA_PKCS,
pad_hash_algo=hash_algorithm)
attestation_certificate = crypto.cert.get_cert_in_format(
attestation_certificate, crypto.utils.FORMAT_DER)
# Clean temp file
if self._is_oid_supported(signing_attributes) is True:
c_path.clean_file(attestation_certificate_extensions_path)
else: # generate_new_attestation_certificate == False
logger.info(
'Using a predefined Attestation certificate and a predefined key'
)
logger.info('Key Used: ' +
attestation_certificate_params['private_key_path'])
logger.info('Certificate Used: ' +
attestation_certificate_params['certificate_path'])
attestation_certificate, attestation_certificate_key_pair = self._get_certificate_and_key_pair_from_files(
attestation_certificate_params)
attestation_certificate = crypto.cert.get_cert_in_format(
attestation_certificate, crypto.utils.FORMAT_DER)
# Since the get_hmac_params_from_certificate_chain always works with the first cert in the cert chain,
# this function will work for a single der certificate as well.
is_hmac = ishmac(imageinfo)
logger.info('Using ' +
('QTI HMAC' if is_hmac else hash_algorithm) +
' for hash segment')
hmacParams = self.get_hmac_params_from_cert(
crypto.cert.get_text(attestation_certificate))
hash_to_sign = Hasher().get_hash(
binary_to_sign,
hmac_params=hmacParams if is_hmac else None,
sha_algo=sha_algo)
signature = crypto.rsa.sign(
hash_to_sign,
attestation_certificate_key_pair['private_key'],
padding=crypto.rsa.RSA_PAD_PSS
if use_pss else crypto.rsa.RSA_PAD_PKCS,
hash_algo=hash_algorithm)
else:
logger.error(
"Attestation certificate params are invalid! Please check config file."
)
raise RuntimeError(
"Attestation certificate params are invalid! Please check config file."
)
if num_certs_in_certchain > 2:
attestation_ca_certificate = crypto.cert.get_cert_in_format(
attestation_ca_certificate, crypto.utils.FORMAT_DER)
else:
attestation_ca_certificate = None
root_cert = crypto.cert.get_cert_in_format(root_cert,
crypto.utils.FORMAT_DER)
root_cert_list = self.cert_data_object.get_rootcerts(
general_properties.num_root_certs)
certificate_list = self._get_certificate_list(
general_properties.num_root_certs, num_certs_in_certchain,
attestation_certificate, attestation_ca_certificate, root_cert,
root_cert_list)
cert_chain = crypto.cert.create_cert_chain_bin(certificate_list)
signer_output = SignerOutput()
signer_output.root_cert = root_cert
signer_output.attestation_ca_cert = attestation_ca_certificate
signer_output.attestation_cert = attestation_certificate
signer_output.signature = signature
signer_output.cert_chain = cert_chain
signer_output.root_cert_list = root_cert_list
signer_output.root_key = root_key_pair['private_key']
# Make sure the variable is defined
try:
attestation_ca_certificate_key_pair
except Exception:
pass
else:
signer_output.attestation_ca_key = attestation_ca_certificate_key_pair[
'private_key']
signer_output.attestation_key = attestation_certificate_key_pair[
'private_key']
signer_output.hash_to_sign = hash_to_sign
return signer_output
