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