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import base64
import struct
import pytest
from winrm.encryption import Encryption
from winrm.exceptions import WinRMError
def test_init_with_invalid_protocol():
with pytest.raises(WinRMError) as excinfo:
Encryption(None, "invalid_protocol")
assert "Encryption for protocol 'invalid_protocol' not supported in pywinrm" in str(excinfo.value)
def test_encrypt_message():
test_session = SessionTest()
test_message = b"unencrypted message"
test_endpoint = b"endpoint"
encryption = Encryption(test_session, "ntlm")
actual = encryption.prepare_encrypted_request(test_session, test_endpoint, test_message)
expected_encrypted_message = b"dW5lbmNyeXB0ZWQgbWVzc2FnZQ=="
expected_signature = b"1234"
signature_length = struct.pack("<i", len(expected_signature))
assert actual.headers == {
"Content-Length": "272",
"Content-Type": 'multipart/encrypted;protocol="application/HTTP-SPNEGO-session-encrypted";boundary="Encrypted Boundary"',
}
assert (
actual.body == b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/HTTP-SPNEGO-session-encrypted\r\n"
b"\tOriginalContent: type=application/soap+xml;charset=UTF-8;Length=19\r\n"
b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/octet-stream\r\n" + signature_length + expected_signature + expected_encrypted_message + b"--Encrypted Boundary--\r\n"
)
def test_encrypt_large_credssp_message():
test_session = SessionTest()
test_message = b"unencrypted message " * 2048
test_endpoint = "http://testhost.com"
message_chunks = [test_message[i : i + 16384] for i in range(0, len(test_message), 16384)]
encryption = Encryption(test_session, "credssp")
actual = encryption.prepare_encrypted_request(test_session, test_endpoint, test_message)
expected_encrypted_message1 = base64.b64encode(message_chunks[0])
expected_encrypted_message2 = base64.b64encode(message_chunks[1])
expected_encrypted_message3 = base64.b64encode(message_chunks[2])
assert actual.headers == {
"Content-Length": "55303",
"Content-Type": 'multipart/x-multi-encrypted;protocol="application/HTTP-CredSSP-session-encrypted";boundary="Encrypted Boundary"',
}
assert (
actual.body == b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/HTTP-CredSSP-session-encrypted\r\n"
b"\tOriginalContent: type=application/soap+xml;charset=UTF-8;Length=16384\r\n"
b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/octet-stream\r\n" + struct.pack("<i", 32) + expected_encrypted_message1 + b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/HTTP-CredSSP-session-encrypted\r\n"
b"\tOriginalContent: type=application/soap+xml;charset=UTF-8;Length=16384\r\n"
b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/octet-stream\r\n" + struct.pack("<i", 32) + expected_encrypted_message2 + b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/HTTP-CredSSP-session-encrypted\r\n"
b"\tOriginalContent: type=application/soap+xml;charset=UTF-8;Length=8192\r\n"
b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/octet-stream\r\n" + struct.pack("<i", 32) + expected_encrypted_message3 + b"--Encrypted Boundary--\r\n"
)
def test_decrypt_message():
test_session = SessionTest()
test_encrypted_message = b"dW5lbmNyeXB0ZWQgbWVzc2FnZQ=="
test_signature = b"1234"
test_signature_length = struct.pack("<i", len(test_signature))
test_message = (
b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/HTTP-SPNEGO-session-encrypted\r\n"
b"\tOriginalContent: type=application/soap+xml;charset=UTF-8;Length=19\r\n"
b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/octet-stream\r\n" + test_signature_length + test_signature + test_encrypted_message + b"--Encrypted Boundary\r\n"
)
test_response = ResponseTest('protocol="application/HTTP-SPNEGO-session-encrypted"', test_message)
encryption = Encryption(test_session, "ntlm")
actual = encryption.parse_encrypted_response(test_response)
assert actual == b"unencrypted message"
def test_decrypt_message_boundary_with_end_hyphens():
test_session = SessionTest()
test_encrypted_message = b"dW5lbmNyeXB0ZWQgbWVzc2FnZQ=="
test_signature = b"1234"
test_signature_length = struct.pack("<i", len(test_signature))
test_message = (
b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/HTTP-SPNEGO-session-encrypted\r\n"
b"\tOriginalContent: type=application/soap+xml;charset=UTF-8;Length=19\r\n"
b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/octet-stream\r\n" + test_signature_length + test_signature + test_encrypted_message + b"--Encrypted Boundary--\r\n"
)
test_response = ResponseTest('protocol="application/HTTP-SPNEGO-session-encrypted"', test_message)
encryption = Encryption(test_session, "ntlm")
actual = encryption.parse_encrypted_response(test_response)
assert actual == b"unencrypted message"
def test_decrypt_message_length_mismatch():
test_session = SessionTest()
test_encrypted_message = b"dW5lbmNyeXB0ZWQgbWVzc2FnZQ=="
test_signature = b"1234"
test_signature_length = struct.pack("<i", len(test_signature))
test_message = (
b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/HTTP-SPNEGO-session-encrypted\r\n"
b"\tOriginalContent: type=application/soap+xml;charset=UTF-8;Length=20\r\n"
b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/octet-stream\r\n" + test_signature_length + test_signature + test_encrypted_message + b"--Encrypted Boundary--\r\n"
)
test_response = ResponseTest('protocol="application/HTTP-SPNEGO-session-encrypted"', test_message)
encryption = Encryption(test_session, "ntlm")
with pytest.raises(WinRMError) as excinfo:
encryption.parse_encrypted_response(test_response)
assert "Encrypted length from server does not match the expected size, message has been tampered with" in str(excinfo.value)
def test_decrypt_large_credssp_message():
test_session = SessionTest()
test_unencrypted_message = b"unencrypted message " * 2048
test_encrypted_message_chunks = [test_unencrypted_message[i : i + 16384] for i in range(0, len(test_unencrypted_message), 16384)]
test_encrypted_message1 = base64.b64encode(test_encrypted_message_chunks[0])
test_encrypted_message2 = base64.b64encode(test_encrypted_message_chunks[1])
test_encrypted_message3 = base64.b64encode(test_encrypted_message_chunks[2])
test_message = (
b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/HTTP-CredSSP-session-encrypted\r\n"
b"\tOriginalContent: type=application/soap+xml;charset=UTF-8;Length=16384\r\n"
b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/octet-stream\r\n" + struct.pack("<i", 5443) + test_encrypted_message1 + b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/HTTP-CredSSP-session-encrypted\r\n"
b"\tOriginalContent: type=application/soap+xml;charset=UTF-8;Length=16384\r\n"
b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/octet-stream\r\n" + struct.pack("<i", 5443) + test_encrypted_message2 + b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/HTTP-CredSSP-session-encrypted\r\n"
b"\tOriginalContent: type=application/soap+xml;charset=UTF-8;Length=8192\r\n"
b"--Encrypted Boundary\r\n"
b"\tContent-Type: application/octet-stream\r\n" + struct.pack("<i", 2711) + test_encrypted_message3 + b"--Encrypted Boundary--\r\n"
)
test_response = ResponseTest('protocol="application/HTTP-CredSSP-session-encrypted"', test_message)
encryption = Encryption(test_session, "credssp")
actual = encryption.parse_encrypted_response(test_response)
assert actual == test_unencrypted_message
def test_decrypt_message_decryption_not_needed():
test_session = SessionTest()
test_response = ResponseTest("application/soap+xml", "unencrypted message")
encryption = Encryption(test_session, "ntlm")
actual = encryption.parse_encrypted_response(test_response)
assert actual == "unencrypted message"
def test_get_credssp_trailer_length_gcm():
test_session = SessionTest()
encryption = Encryption(test_session, "credssp")
expected = 16
actual = encryption._get_credssp_trailer_length(30, "ECDHE-RSA-AES128-GCM-SHA256")
assert actual == expected
def test_get_credssp_trailer_length_md5_rc4():
test_session = SessionTest()
encryption = Encryption(test_session, "credssp")
expected = 16
actual = encryption._get_credssp_trailer_length(30, "RC4-MD5")
assert actual == expected
def test_get_credssp_trailer_length_sha256_3des():
test_session = SessionTest()
encryption = Encryption(test_session, "credssp")
expected = 34
actual = encryption._get_credssp_trailer_length(30, "ECDH-ECDSA-3DES-SHA256")
assert actual == expected
def test_get_credssp_trailer_length_sha384_aes():
test_session = SessionTest()
encryption = Encryption(test_session, "credssp")
expected = 50
actual = encryption._get_credssp_trailer_length(30, "ECDH-RSA-AES-SHA384")
assert actual == expected
def test_get_credssp_trailer_length_no_hash():
test_session = SessionTest()
encryption = Encryption(test_session, "credssp")
expected = 2
actual = encryption._get_credssp_trailer_length(30, "ECDH-RSA-AES")
assert actual == expected
class SessionTest(object):
def __init__(self):
self.auth = AuthTest()
def prepare_request(self, request):
request.body = request.data
return request
# used as a mock CredSSP context object
class CredSSPContext(object):
def __init__(self):
class TlsContext(object):
def get_cipher_name(self):
return "ECDH-RSA-AES256-SHA"
self.tls_connection = TlsContext()
self.session_security = SessionSecurityTest()
# used with CredSSP
def wrap(self, message):
encoded_message, signature = self.session_security.wrap(message)
return encoded_message
# used with CredSSP
def unwrap(self, message):
decoded_mesage = self.session_security.unwrap(message, b"1234")
return decoded_mesage
class AuthTest(object):
def __init__(self):
# used with NTLM
self.session_security = SessionSecurityTest()
# used with CredSSP
self.contexts = {"testhost.com": CredSSPContext()}
class SessionSecurityTest(object):
def wrap(self, message):
encoded_message = base64.b64encode(message)
signature = b"1234"
return encoded_message, signature
def unwrap(self, message, signature):
assert signature == b"1234"
decoded_message = base64.b64decode(message)
return decoded_message
class RequestTest(object):
def __init__(self):
self.url = "http://testhost.com/path"
class ResponseTest(object):
def __init__(self, content_type, content):
self.headers = {"Content-Type": content_type}
self.content = content
self.text = content
self.request = RequestTest()
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