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Reduce code duplication in noise tests (#689)

This commit is contained in:
J. Nick Koston 2023-11-24 10:38:43 -06:00 committed by GitHub
parent 412a78aa04
commit 9d27f0c772
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 56 additions and 52 deletions
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108
tests/test__frame_helper.py
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@ -41,6 +41,20 @@ from .conftest import get_mock_connection_params
PREAMBLE = b"\x00"
def _extract_encrypted_payload_from_handshake(handshake_pkt: bytes) -> bytes:
noise_hello = handshake_pkt[0:3]
pkt_header = handshake_pkt[3:6]
assert noise_hello == NOISE_HELLO
assert pkt_header[0] == 1 # type
pkg_length_high = pkt_header[1]
pkg_length_low = pkt_header[2]
pkg_length = (pkg_length_high << 8) + pkg_length_low
assert pkg_length == 49
noise_prefix = handshake_pkt[6:7]
assert noise_prefix == b"\x00"
return handshake_pkt[7:]
def _make_noise_hello_pkt(hello_pkt: bytes) -> bytes:
"""Make a noise hello packet."""
preamble = 1
@ -51,6 +65,42 @@ def _make_noise_hello_pkt(hello_pkt: bytes) -> bytes:
return hello_header + hello_pkt
def _make_noise_handshake_pkt(proto: NoiseConnection) -> bytes:
handshake = proto.write_message(b"")
handshake_pkt = b"\x00" + handshake
preamble = 1
handshake_pkg_length = len(handshake_pkt)
handshake_pkg_length_high = (handshake_pkg_length >> 8) & 0xFF
handshake_pkg_length_low = handshake_pkg_length & 0xFF
handshake_header = bytes(
(preamble, handshake_pkg_length_high, handshake_pkg_length_low)
)
return handshake_header + handshake_pkt
def _make_encrypted_packet(
proto: NoiseConnection, msg_type: int, encrypted_payload: bytes
) -> bytes:
msg_type = 42
msg_type_high = (msg_type >> 8) & 0xFF
msg_type_low = msg_type & 0xFF
msg_length = len(encrypted_payload)
msg_length_high = (msg_length >> 8) & 0xFF
msg_length_low = msg_length & 0xFF
msg_header = bytes((msg_type_high, msg_type_low, msg_length_high, msg_length_low))
encrypted_payload = proto.encrypt(msg_header + b"from device")
preamble = 1
encrypted_pkg_length = len(encrypted_payload)
encrypted_pkg_length_high = (encrypted_pkg_length >> 8) & 0xFF
encrypted_pkg_length_low = encrypted_pkg_length & 0xFF
encrypted_header = bytes(
(preamble, encrypted_pkg_length_high, encrypted_pkg_length_low)
)
return encrypted_header + encrypted_payload
def _mock_responder_proto(psk_bytes: bytes) -> NoiseConnection:
proto = NoiseConnection.from_name(
b"Noise_NNpsk0_25519_ChaChaPoly_SHA256", backend=ESPHOME_NOISE_BACKEND
@ -440,18 +490,7 @@ async def test_noise_frame_helper_handshake_failure():
assert len(writes) == 1
handshake_pkt = writes.pop()
noise_hello = handshake_pkt[0:3]
pkt_header = handshake_pkt[3:6]
assert noise_hello == NOISE_HELLO
assert pkt_header[0] == 1 # type
pkg_length_high = pkt_header[1]
pkg_length_low = pkt_header[2]
pkg_length = (pkg_length_high << 8) + pkg_length_low
assert pkg_length == 49
noise_prefix = handshake_pkt[6:7]
assert noise_prefix == b"\x00"
encrypted_payload = handshake_pkt[7:]
encrypted_payload = _extract_encrypted_payload_from_handshake(handshake_pkt)
decrypted = proto.read_message(encrypted_payload)
assert decrypted == b""
@ -502,35 +541,14 @@ async def test_noise_frame_helper_handshake_success_with_single_packet():
assert len(writes) == 1
handshake_pkt = writes.pop()
noise_hello = handshake_pkt[0:3]
pkt_header = handshake_pkt[3:6]
assert noise_hello == NOISE_HELLO
assert pkt_header[0] == 1 # type
pkg_length_high = pkt_header[1]
pkg_length_low = pkt_header[2]
pkg_length = (pkg_length_high << 8) + pkg_length_low
assert pkg_length == 49
noise_prefix = handshake_pkt[6:7]
assert noise_prefix == b"\x00"
encrypted_payload = handshake_pkt[7:]
encrypted_payload = _extract_encrypted_payload_from_handshake(handshake_pkt)
decrypted = proto.read_message(encrypted_payload)
assert decrypted == b""
hello_pkt_with_header = _make_noise_hello_pkt(b"\x01servicetest\0")
mock_data_received(helper, hello_pkt_with_header)
handshake = proto.write_message(b"")
handshake_pkt = b"\x00" + handshake
preamble = 1
handshake_pkg_length = len(handshake_pkt)
handshake_pkg_length_high = (handshake_pkg_length >> 8) & 0xFF
handshake_pkg_length_low = handshake_pkg_length & 0xFF
handshake_header = bytes(
(preamble, handshake_pkg_length_high, handshake_pkg_length_low)
)
handshake_with_header = handshake_header + handshake_pkt
handshake_with_header = _make_noise_handshake_pkt(proto)
mock_data_received(helper, handshake_with_header)
assert not writes
@ -545,28 +563,14 @@ async def test_noise_frame_helper_handshake_success_with_single_packet():
pkg_length = (pkg_length_high << 8) + pkg_length_low
assert len(encrypted_packet) == 3 + pkg_length
msg_type = 42
msg_type_high = (msg_type >> 8) & 0xFF
msg_type_low = msg_type & 0xFF
msg_length = len(encrypted_payload)
msg_length_high = (msg_length >> 8) & 0xFF
msg_length_low = msg_length & 0xFF
msg_header = bytes((msg_type_high, msg_type_low, msg_length_high, msg_length_low))
encrypted_payload = proto.encrypt(msg_header + b"from device")
encrypted_packet = _make_encrypted_packet(proto, 42, b"from device")
preamble = 1
encrypted_pkg_length = len(encrypted_payload)
encrypted_pkg_length_high = (encrypted_pkg_length >> 8) & 0xFF
encrypted_pkg_length_low = encrypted_pkg_length & 0xFF
encrypted_header = bytes(
(preamble, encrypted_pkg_length_high, encrypted_pkg_length_low)
)
mock_data_received(helper, encrypted_header + encrypted_payload)
mock_data_received(helper, encrypted_packet)
assert packets == [(42, b"from device")]
helper.close()
mock_data_received(helper, encrypted_header + encrypted_payload)
mock_data_received(helper, encrypted_packet)
@pytest.mark.asyncio