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# -*- coding: utf-8 -*-
# Copyright: (c) 2023, Jordan Borean (@jborean93) <jborean93@gmail.com>
# MIT License (see LICENSE or https://opensource.org/licenses/MIT)
import socket
import sys
import pytest
import spnego
import spnego._credssp
import spnego._gss
import spnego._sspi
import spnego.channel_bindings
import spnego.iov
from spnego.exceptions import NoContextError
def _kerb_exchange(
client: spnego.ContextProxy,
server: spnego.ContextProxy,
) -> None:
tok1 = client.step()
assert tok1
assert not client.complete
assert not server.complete
tok2 = server.step(tok1)
assert tok2
assert not client.complete
assert not server.complete
if client.protocol == "negotiate":
tok3 = client.step(tok2)
assert tok3
assert not client.complete
assert not server.complete
tok4 = server.step(tok3)
assert tok4
assert not client.complete
assert server.complete
tok5 = client.step(tok4)
assert not tok5
assert client.complete
assert server.complete
else:
tok3 = client.step(tok2)
assert tok3
assert client.complete
assert not server.complete
tok4 = server.step(tok3)
assert not tok4
assert client.complete
assert server.complete
def _ntlm_exchange(
client: spnego.ContextProxy,
server: spnego.ContextProxy,
) -> None:
negotiate = client.step()
assert negotiate
assert not client.complete
assert not server.complete
challenge = server.step(negotiate)
assert challenge
assert not client.complete
assert not server.complete
authentication = client.step(challenge)
assert authentication
# If it's being wrapped by SPNEGO then an extra msg is expected
if authentication.startswith(b"NTLMSSP\x00"):
assert client.complete
assert not server.complete
final = server.step(authentication)
assert not final
assert client.complete
assert server.complete
else:
assert not client.complete
assert not server.complete
mech_list = server.step(authentication)
assert mech_list
assert not client.complete
assert server.complete
final = client.step(mech_list)
assert not final
assert client.complete
assert server.complete
def _message_test(
client: spnego.ContextProxy,
server: spnego.ContextProxy,
sign_header: bool = True,
) -> None:
sign_type = spnego.iov.BufferType.sign_only if sign_header else spnego.iov.BufferType.data_readonly
wrap1 = client.wrap_iov(
[
(sign_type, b"header"),
b"data",
(sign_type, b"sec_trailer"),
spnego.iov.BufferType.header,
]
)
assert wrap1.buffers[1].data != b"data"
unwrap1 = server.unwrap_iov(wrap1.buffers)
assert unwrap1.buffers[1].data == b"data"
wrap2 = server.wrap_iov(
[
(sign_type, b"header"),
b"data",
(sign_type, b"sec_trailer"),
spnego.iov.BufferType.header,
]
)
assert wrap2.buffers[1].data != b"data"
unwrap2 = client.unwrap_iov(wrap2.buffers)
assert unwrap2.buffers[1].data == b"data"
@pytest.mark.parametrize("protocol", ["negotiate", "kerberos"])
def test_kerberos(protocol, kerb_cred):
if sys.platform == "darwin":
pytest.skip("Environment problem with GSS.Framework - skip")
c = spnego.client(
kerb_cred.user_princ,
None,
protocol=protocol,
hostname=socket.getfqdn(),
context_req=spnego.ContextReq.default | spnego.ContextReq.dce_style,
)
s = spnego.server(
protocol=protocol,
context_req=spnego.ContextReq.default | spnego.ContextReq.dce_style,
)
expected_no_context = "Cannot get message sizes until context has been established"
with pytest.raises(NoContextError, match=expected_no_context):
c.query_message_sizes()
with pytest.raises(NoContextError, match=expected_no_context):
s.query_message_sizes()
_kerb_exchange(c, s)
c_sizes = c.query_message_sizes()
assert isinstance(c_sizes.header, int)
s_sizes = s.query_message_sizes()
assert isinstance(s_sizes.header, int)
_message_test(c, s, sign_header=False)
_message_test(c, s, sign_header=True)
@pytest.mark.parametrize("protocol", ["negotiate", "ntlm"])
def test_ntlm(protocol, ntlm_cred):
c = spnego.client(
ntlm_cred[0],
ntlm_cred[1],
protocol=protocol,
hostname=socket.getfqdn(),
context_req=spnego.ContextReq.default | spnego.ContextReq.dce_style,
)
s = spnego.server(
protocol=protocol,
context_req=spnego.ContextReq.default | spnego.ContextReq.dce_style,
options=spnego.NegotiateOptions.use_negotiate,
)
expected_no_context = "Cannot get message sizes until context has been established"
with pytest.raises(NoContextError, match=expected_no_context):
c.query_message_sizes()
with pytest.raises(NoContextError, match=expected_no_context):
s.query_message_sizes()
_ntlm_exchange(c, s)
c_sizes = c.query_message_sizes()
assert c_sizes.header == 16
s_sizes = s.query_message_sizes()
assert s_sizes.header == 16
_message_test(c, s, sign_header=False)
_message_test(c, s, sign_header=True)
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