def test_sas_local_errors(self):
alice = Sas(
alice_id,
alice_device_id,
alice_keys["ed25519"],
bob_device,
)
start = {
"sender": alice_id,
"content": alice.start_verification().content
}
start_event = KeyVerificationStart.from_dict(start)
bob = Sas.from_key_verification_start(bob_id, bob_device_id,
bob_keys["ed25519"],
alice_device, start_event)
alice.set_their_pubkey(bob.pubkey)
alice.state = SasState.canceled
bob.state = SasState.canceled
with pytest.raises(LocalProtocolError):
bob.accept_verification()
with pytest.raises(LocalProtocolError):
alice.share_key()
alice.sas_accepted = True
with pytest.raises(LocalProtocolError):
alice.get_mac()
def test_client_full_sas(self, olm_machine):
alice_device = OlmDevice(olm_machine.user_id, olm_machine.device_id,
olm_machine.account.identity_keys)
bob_device = olm_machine.device_store[bob_id][bob_device_id]
bob_sas = Sas(
bob_id,
bob_device_id,
bob_device.ed25519,
alice_device,
)
start = {
"sender": bob_id,
"content": bob_sas.start_verification().content
}
start_event = KeyVerificationStart.from_dict(start)
assert olm_machine.device_store[bob_id][bob_device_id]
olm_machine.handle_key_verification(start_event)
alice_sas = olm_machine.key_verifications[start_event.transaction_id]
accept = {
"sender": olm_machine.user_id,
"content": alice_sas.accept_verification().content
}
accept_event = KeyVerificationAccept.from_dict(accept)
bob_sas.receive_accept_event(accept_event)
bob_key = {"sender": bob_id, "content": bob_sas.share_key().content}
bob_key_event = KeyVerificationKey.from_dict(bob_key)
olm_machine.handle_key_verification(bob_key_event)
alice_key = {
"sender": alice_id,
"content": alice_sas.share_key().content
}
alice_key_event = KeyVerificationKey.from_dict(alice_key)
bob_sas.receive_key_event(alice_key_event)
assert alice_sas.other_key_set
assert bob_sas.other_key_set
bob_sas.accept_sas()
bob_mac = {"sender": bob_id, "content": bob_sas.get_mac().content}
bob_mac_event = KeyVerificationMac.from_dict(bob_mac)
olm_machine.handle_key_verification(bob_mac_event)
assert alice_sas.state == SasState.mac_received
assert not alice_sas.verified
alice_sas.accept_sas()
assert alice_sas.verified
bob_mac_event.keys = "fake_keys"
olm_machine.handle_key_verification(bob_mac_event)
assert alice_sas.verified
def test_sas_old_mac_method(self):
alice = Sas(
alice_id,
alice_device_id,
alice_keys["ed25519"],
bob_device,
)
start = {
"sender": alice_id,
"content": alice.start_verification().content
}
start_event = KeyVerificationStart.from_dict(start)
start_event.message_authentication_codes.remove(Sas._mac_normal)
bob = Sas.from_key_verification_start(bob_id, bob_device_id,
bob_keys["ed25519"],
alice_device, start_event)
with pytest.raises(LocalProtocolError):
alice.accept_sas()
alice.set_their_pubkey(bob.pubkey)
bob.set_their_pubkey(alice.pubkey)
alice.state = SasState.key_received
bob.state = SasState.key_received
alice.chosen_mac_method = Sas._mac_normal
bob.chosen_mac_method = Sas._mac_normal
with pytest.raises(LocalProtocolError):
alice.get_mac()
alice.accept_sas()
alice_mac = {"sender": alice_id, "content": alice.get_mac().content}
mac_event = KeyVerificationMac.from_dict(alice_mac)
assert isinstance(mac_event, KeyVerificationMac)
assert not bob.verified
bob.receive_mac_event(mac_event)
assert bob.state == SasState.mac_received
assert not bob.verified
bob.accept_sas()
assert bob.verified
def test_client_invalid_key(self, olm_machine):
alice_device = OlmDevice(olm_machine.user_id, olm_machine.device_id,
olm_machine.account.identity_keys)
bob_sas = Sas(
bob_id,
bob_device_id,
faker.olm_key_pair()["ed25519"],
alice_device,
)
start = {
"sender": bob_id,
"content": bob_sas.start_verification().content
}
start_event = KeyVerificationStart.from_dict(start)
assert olm_machine.device_store[bob_id][bob_device_id]
olm_machine.handle_key_verification(start_event)
alice_sas = olm_machine.key_verifications[start_event.transaction_id]
accept = {
"sender": olm_machine.user_id,
"content": alice_sas.accept_verification().content
}
accept_event = KeyVerificationAccept.from_dict(accept)
bob_sas.receive_accept_event(accept_event)
bob_key = {"sender": bob_id, "content": bob_sas.share_key().content}
bob_key_event = KeyVerificationKey.from_dict(bob_key)
olm_machine.handle_key_verification(bob_key_event)
alice_key = {
"sender": alice_id,
"content": alice_sas.share_key().content
}
alice_key_event = KeyVerificationKey.from_dict(alice_key)
bob_sas.receive_key_event(alice_key_event)
assert alice_sas.other_key_set
assert bob_sas.other_key_set
bob_sas.accept_sas()
bob_mac = {"sender": bob_id, "content": bob_sas.get_mac().content}
bob_mac_event = KeyVerificationMac.from_dict(bob_mac)
olm_machine.handle_key_verification(bob_mac_event)
assert alice_sas.state == SasState.canceled
assert not alice_sas.verified
with pytest.raises(LocalProtocolError):
alice_sas.accept_sas()
def test_sas_mac(self):
alice = Sas(
alice_id,
alice_device_id,
alice_keys["ed25519"],
bob_device,
)
start = {"sender": alice_id, "content": alice.start_verification()}
start_event = KeyVerificationStart.from_dict(start)
bob = Sas.from_key_verification_start(bob_id, bob_device_id,
bob_keys["ed25519"],
alice_device, start_event)
with pytest.raises(LocalProtocolError):
alice.accept_sas()
alice.set_their_pubkey(bob.pubkey)
bob.set_their_pubkey(alice.pubkey)
alice.state = SasState.key_received
bob.state = SasState.key_received
with pytest.raises(LocalProtocolError):
alice.get_mac()
alice.accept_sas()
alice_mac = {"sender": alice_id, "content": alice.get_mac()}
mac_event = KeyVerificationMac.from_dict(alice_mac)
assert isinstance(mac_event, KeyVerificationMac)
assert not bob.verified
bob.receive_mac_event(mac_event)
assert bob.state == SasState.mac_received
assert not bob.verified
bob.accept_sas()
assert bob.verified
def test_sas_invalid_mac(self):
alice = Sas(
alice_id,
alice_device_id,
alice_keys["ed25519"],
bob_device,
)
start = {
"sender": alice_id,
"content": alice.start_verification().content
}
start_event = KeyVerificationStart.from_dict(start)
bob = Sas.from_key_verification_start(bob_id, bob_device_id,
bob_keys["ed25519"],
alice_device, start_event)
with pytest.raises(LocalProtocolError):
alice.accept_sas()
alice.set_their_pubkey(bob.pubkey)
bob.set_their_pubkey(alice.pubkey)
alice.state = SasState.key_received
bob.state = SasState.key_received
alice.chosen_mac_method = Sas._mac_normal
bob.chosen_mac_method = Sas._mac_normal
alice.accept_sas()
alice_mac = {"sender": alice_id, "content": alice.get_mac().content}
mac_event = KeyVerificationMac.from_dict(alice_mac)
mac_event.keys = "FAKEKEYS"
bob.receive_mac_event(mac_event)
assert bob.canceled
assert not bob.verified
bob.state = SasState.key_received
assert not bob.canceled
mac_event = KeyVerificationMac.from_dict(alice_mac)
mac_event.mac["ed25519:{}".format(alice_device_id)] = "FAKEKEYS"
bob.receive_mac_event(mac_event)
assert bob.canceled
assert not bob.verified