import pytest from cryptography import x509 from cryptography.hazmat.primitives import hashes from cryptography.hazmat.primitives.asymmetric import ec from cryptography.x509 import extensions as ext from trezorlib import device from trezorlib.debuglink import TrezorClientDebugLink as Client from ..common import compact_size pytestmark = [pytest.mark.skip_t1, pytest.mark.skip_t2] ROOT_PUBLIC_KEY = bytes.fromhex( "047f77368dea2d4d61e989f474a56723c3212dacf8a808d8795595ef38441427c4389bc454f02089d7f08b873005e4c28d432468997871c0bf286fd3861e21e96a" ) @pytest.mark.parametrize( "challenge", ( b"", b"hello world", b"\x00" * 1024, bytes.fromhex( "21f3d40e63c304d0312f62eb824113efd72ba1ee02bef6777e7f8a7b6f67ba16" ), ), ) def test_authenticate_device(client: Client, challenge: bytes) -> None: # NOTE Applications must generate a random challenge for each request. # Issue an AuthenticateDevice challenge to Trezor. proof = device.authenticate(client, challenge) certs = [x509.load_der_x509_certificate(cert) for cert in proof.certificates] # Verify the last certificate in the certificate chain against trust anchor. root_public_key = ec.EllipticCurvePublicKey.from_encoded_point( ec.SECP256R1(), ROOT_PUBLIC_KEY ) root_public_key.verify( certs[-1].signature, certs[-1].tbs_certificate_bytes, certs[-1].signature_algorithm_parameters, ) # Verify the certificate chain. for cert, ca_cert in zip(certs, certs[1:]): assert cert.issuer == ca_cert.subject ca_basic_constraints = ca_cert.extensions.get_extension_for_class( ext.BasicConstraints ).value assert ca_basic_constraints.ca is True try: basic_constraints = cert.extensions.get_extension_for_class( ext.BasicConstraints ).value if basic_constraints.ca: assert basic_constraints.path_length < ca_basic_constraints.path_length except ext.ExtensionNotFound: pass ca_cert.public_key().verify( cert.signature, cert.tbs_certificate_bytes, cert.signature_algorithm_parameters, ) # Verify that the common name matches the Trezor model. common_name = cert.subject.get_attributes_for_oid(x509.oid.NameOID.COMMON_NAME)[0] assert common_name.value.startswith(client.features.internal_model) # Verify the signature of the challenge. data = b"\x13AuthenticateDevice:" + compact_size(len(challenge)) + challenge certs[0].public_key().verify(proof.signature, data, ec.ECDSA(hashes.SHA256()))