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import copy
import pytest
from configuration import available_ports, ALL_TEST_CIPHERS, ALL_TEST_CERTS
from common import ProviderOptions, Protocols, Certificates, Signatures, data_bytes
from fixtures import managed_process # lgtm [py/unused-import]
from providers import Provider, S2N, OpenSSL, GnuTLS
from utils import invalid_test_parameters, get_parameter_name, get_expected_s2n_version, to_bytes
certs = [
Certificates.RSA_2048_SHA256,
Certificates.RSA_2048_SHA384,
Certificates.RSA_PSS_2048_SHA256,
Certificates.ECDSA_256,
Certificates.ECDSA_384,
]
all_sigs = [
Signatures.RSA_SHA1,
Signatures.RSA_SHA224,
Signatures.RSA_SHA256,
Signatures.RSA_SHA384,
Signatures.RSA_SHA512,
Signatures.ECDSA_SECP256r1_SHA256,
Signatures.RSA_PSS_RSAE_SHA256,
Signatures.RSA_PSS_PSS_SHA256,
]
def signature_marker(mode, signature):
return to_bytes("{mode} signature negotiated: {type}+{digest}"
.format(mode=mode.title(), type=signature.sig_type, digest=signature.sig_digest))
def skip_ciphers(*args, **kwargs):
provider = kwargs.get('provider')
cert = kwargs.get('certificate')
cipher = kwargs.get('cipher')
protocol = kwargs.get('protocol')
sigalg = kwargs.get('signature')
if not provider.supports_signature(sigalg):
return True
if not cert.compatible_with_cipher(cipher):
return True
if not cert.compatible_with_sigalg(sigalg):
return True
if protocol > sigalg.max_protocol:
return True
if protocol < sigalg.min_protocol:
return True
return invalid_test_parameters(*args, **kwargs)
@pytest.mark.uncollect_if(func=skip_ciphers)
@pytest.mark.parametrize("cipher", ALL_TEST_CIPHERS, ids=get_parameter_name)
@pytest.mark.parametrize("provider", [OpenSSL, GnuTLS])
@pytest.mark.parametrize("other_provider", [S2N])
@pytest.mark.parametrize("protocol", [Protocols.TLS13, Protocols.TLS12], ids=get_parameter_name)
@pytest.mark.parametrize("certificate", ALL_TEST_CERTS, ids=get_parameter_name)
@pytest.mark.parametrize("signature", all_sigs, ids=get_parameter_name)
@pytest.mark.parametrize("client_auth", [True, False], ids=lambda val: "client-auth" if val else "no-client-auth")
def test_s2n_server_signature_algorithms(managed_process, cipher, provider, other_provider, protocol, certificate,
signature, client_auth):
port = next(available_ports)
random_bytes = data_bytes(64)
client_options = ProviderOptions(
mode=Provider.ClientMode,
port=port,
cipher=cipher,
data_to_send=random_bytes,
insecure=False,
use_client_auth=client_auth,
key=certificate.key,
cert=certificate.cert,
signature_algorithm=signature,
protocol=protocol
)
if provider == GnuTLS:
# GnuTLS fails the CA verification. It must be run with this check disabled.
client_options.extra_flags = ["--no-ca-verification"]
server_options = copy.copy(client_options)
server_options.extra_flags = None
server_options.data_to_send = None
server_options.mode = Provider.ServerMode
server_options.key = certificate.key
server_options.cert = certificate.cert
server = managed_process(S2N, server_options, timeout=5)
client = managed_process(provider, client_options, timeout=5)
for results in client.get_results():
results.assert_success()
expected_version = get_expected_s2n_version(protocol, provider)
for results in server.get_results():
results.assert_success()
assert to_bytes("Actual protocol version: {}".format(
expected_version)) in results.stdout
assert signature_marker(Provider.ServerMode,
signature) in results.stdout
assert (signature_marker(Provider.ClientMode, signature)
in results.stdout) == client_auth
assert random_bytes in results.stdout
@pytest.mark.uncollect_if(func=skip_ciphers)
@pytest.mark.parametrize("cipher", ALL_TEST_CIPHERS, ids=get_parameter_name)
@pytest.mark.parametrize("provider", [OpenSSL, GnuTLS])
@pytest.mark.parametrize("other_provider", [S2N])
@pytest.mark.parametrize("protocol", [Protocols.TLS13, Protocols.TLS12], ids=get_parameter_name)
@pytest.mark.parametrize("certificate", ALL_TEST_CERTS, ids=get_parameter_name)
@pytest.mark.parametrize("signature", all_sigs, ids=get_parameter_name)
@pytest.mark.parametrize("client_auth", [True, False], ids=lambda val: "client-auth" if val else "no-client-auth")
def test_s2n_client_signature_algorithms(managed_process, cipher, provider, other_provider, protocol, certificate,
signature, client_auth):
port = next(available_ports)
random_bytes = data_bytes(64)
client_options = ProviderOptions(
mode=Provider.ClientMode,
port=port,
cipher=cipher,
data_to_send=random_bytes,
insecure=True,
use_client_auth=client_auth,
key=certificate.key,
cert=certificate.cert,
protocol=protocol)
server_options = copy.copy(client_options)
server_options.data_to_send = None
server_options.mode = Provider.ServerMode
server_options.key = certificate.key
server_options.cert = certificate.cert
server_options.trust_store = certificate.cert
server_options.signature_algorithm = signature
kill_marker = None
if provider == GnuTLS:
kill_marker = random_bytes
server = managed_process(provider, server_options,
timeout=5, kill_marker=kill_marker)
client = managed_process(S2N, client_options, timeout=5)
for results in server.get_results():
results.assert_success()
assert any(
[random_bytes in stream for stream in results.output_streams()])
expected_version = get_expected_s2n_version(protocol, provider)
# In versions before TLS1.3, the server uses the negotiated signature scheme for the
# ServerKeyExchange message. The server only sends the ServerKeyExchange message when using
# a key exchange method that provides forward secrecy, ie, NOT static RSA.
# So if using RSA key exchange, there is no actual "negotiated" signature scheme, because
# the server never sends the client a signature scheme.
#
# This mostly has to be inferred from the RFCs, but this blog post is a pretty good summary
# of the situation: https://timtaubert.de/blog/2016/07/the-evolution-of-signatures-in-tls/
server_sigalg_used = not cipher.iana_standard_name.startswith(
"TLS_RSA_WITH_")
for results in client.get_results():
results.assert_success()
assert to_bytes("Actual protocol version: {}".format(
expected_version)) in results.stdout
assert signature_marker(
Provider.ServerMode, signature) in results.stdout or not server_sigalg_used
assert (signature_marker(Provider.ClientMode, signature)
in results.stdout) == client_auth
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