232 lines
8.1 KiB
Python
232 lines
8.1 KiB
Python
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# Some tests of the win32security sspi functions.
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# Stolen from Roger's original test_sspi.c, a version of which is in "Demos"
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# See also the other SSPI demos.
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import re
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import unittest
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import sspi
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import sspicon
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import win32api
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import win32security
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from pywin32_testutil import TestSkipped, str2bytes, testmain
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# It is quite likely that the Kerberos tests will fail due to not being
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# installed. The NTLM tests do *not* get the same behaviour as they should
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# always be there.
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def applyHandlingSkips(func, *args):
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try:
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return func(*args)
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except win32api.error as exc:
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if exc.winerror in [
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sspicon.SEC_E_NO_CREDENTIALS,
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sspicon.SEC_E_NO_AUTHENTICATING_AUTHORITY,
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]:
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raise TestSkipped(exc)
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raise
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class TestSSPI(unittest.TestCase):
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def assertRaisesHRESULT(self, hr, func, *args):
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try:
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return func(*args)
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raise RuntimeError("expecting %s failure" % (hr,))
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except win32security.error as exc:
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self.assertEqual(exc.winerror, hr)
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def _doAuth(self, pkg_name):
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sspiclient = sspi.ClientAuth(pkg_name, targetspn=win32api.GetUserName())
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sspiserver = sspi.ServerAuth(pkg_name)
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sec_buffer = None
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err = 1
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while err != 0:
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err, sec_buffer = sspiclient.authorize(sec_buffer)
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err, sec_buffer = sspiserver.authorize(sec_buffer)
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return sspiclient, sspiserver
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def _doTestImpersonate(self, pkg_name):
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# Just for the sake of code exercising!
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sspiclient, sspiserver = self._doAuth(pkg_name)
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sspiserver.ctxt.ImpersonateSecurityContext()
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sspiserver.ctxt.RevertSecurityContext()
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def testImpersonateKerberos(self):
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applyHandlingSkips(self._doTestImpersonate, "Kerberos")
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def testImpersonateNTLM(self):
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self._doTestImpersonate("NTLM")
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def _doTestEncrypt(self, pkg_name):
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sspiclient, sspiserver = self._doAuth(pkg_name)
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pkg_size_info = sspiclient.ctxt.QueryContextAttributes(
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sspicon.SECPKG_ATTR_SIZES
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)
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msg = str2bytes("some data to be encrypted ......")
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trailersize = pkg_size_info["SecurityTrailer"]
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encbuf = win32security.PySecBufferDescType()
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encbuf.append(win32security.PySecBufferType(len(msg), sspicon.SECBUFFER_DATA))
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encbuf.append(
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win32security.PySecBufferType(trailersize, sspicon.SECBUFFER_TOKEN)
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)
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encbuf[0].Buffer = msg
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sspiclient.ctxt.EncryptMessage(0, encbuf, 1)
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sspiserver.ctxt.DecryptMessage(encbuf, 1)
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self.assertEqual(msg, encbuf[0].Buffer)
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# and test the higher-level functions
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data_in = str2bytes("hello")
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data, sig = sspiclient.encrypt(data_in)
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self.assertEqual(sspiserver.decrypt(data, sig), data_in)
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data, sig = sspiserver.encrypt(data_in)
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self.assertEqual(sspiclient.decrypt(data, sig), data_in)
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def _doTestEncryptStream(self, pkg_name):
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# Test out the SSPI/GSSAPI interop wrapping examples at
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# https://docs.microsoft.com/en-us/windows/win32/secauthn/sspi-kerberos-interoperability-with-gssapi
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sspiclient, sspiserver = self._doAuth(pkg_name)
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pkg_size_info = sspiclient.ctxt.QueryContextAttributes(
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sspicon.SECPKG_ATTR_SIZES
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)
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msg = str2bytes("some data to be encrypted ......")
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trailersize = pkg_size_info["SecurityTrailer"]
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blocksize = pkg_size_info["BlockSize"]
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encbuf = win32security.PySecBufferDescType()
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encbuf.append(
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win32security.PySecBufferType(trailersize, sspicon.SECBUFFER_TOKEN)
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)
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encbuf.append(win32security.PySecBufferType(len(msg), sspicon.SECBUFFER_DATA))
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encbuf.append(
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win32security.PySecBufferType(blocksize, sspicon.SECBUFFER_PADDING)
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)
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encbuf[1].Buffer = msg
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sspiclient.ctxt.EncryptMessage(0, encbuf, 1)
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encmsg = encbuf[0].Buffer + encbuf[1].Buffer + encbuf[2].Buffer
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decbuf = win32security.PySecBufferDescType()
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decbuf.append(
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win32security.PySecBufferType(len(encmsg), sspicon.SECBUFFER_STREAM)
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)
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decbuf.append(win32security.PySecBufferType(0, sspicon.SECBUFFER_DATA))
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decbuf[0].Buffer = encmsg
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sspiserver.ctxt.DecryptMessage(decbuf, 1)
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self.assertEqual(msg, decbuf[1].Buffer)
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def testEncryptNTLM(self):
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self._doTestEncrypt("NTLM")
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def testEncryptStreamNTLM(self):
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self._doTestEncryptStream("NTLM")
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def testEncryptKerberos(self):
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applyHandlingSkips(self._doTestEncrypt, "Kerberos")
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def testEncryptStreamKerberos(self):
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applyHandlingSkips(self._doTestEncryptStream, "Kerberos")
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def _doTestSign(self, pkg_name):
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sspiclient, sspiserver = self._doAuth(pkg_name)
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pkg_size_info = sspiclient.ctxt.QueryContextAttributes(
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sspicon.SECPKG_ATTR_SIZES
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)
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msg = str2bytes("some data to be encrypted ......")
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sigsize = pkg_size_info["MaxSignature"]
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sigbuf = win32security.PySecBufferDescType()
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sigbuf.append(win32security.PySecBufferType(len(msg), sspicon.SECBUFFER_DATA))
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sigbuf.append(win32security.PySecBufferType(sigsize, sspicon.SECBUFFER_TOKEN))
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sigbuf[0].Buffer = msg
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sspiclient.ctxt.MakeSignature(0, sigbuf, 0)
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sspiserver.ctxt.VerifySignature(sigbuf, 0)
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# and test the higher-level functions
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sspiclient.next_seq_num = 1
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sspiserver.next_seq_num = 1
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data = str2bytes("hello")
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key = sspiclient.sign(data)
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sspiserver.verify(data, key)
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key = sspiclient.sign(data)
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self.assertRaisesHRESULT(
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sspicon.SEC_E_MESSAGE_ALTERED, sspiserver.verify, data + data, key
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)
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# and the other way
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key = sspiserver.sign(data)
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sspiclient.verify(data, key)
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key = sspiserver.sign(data)
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self.assertRaisesHRESULT(
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sspicon.SEC_E_MESSAGE_ALTERED, sspiclient.verify, data + data, key
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)
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def testSignNTLM(self):
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self._doTestSign("NTLM")
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def testSignKerberos(self):
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applyHandlingSkips(self._doTestSign, "Kerberos")
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def _testSequenceSign(self):
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# Only Kerberos supports sequence detection.
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sspiclient, sspiserver = self._doAuth("Kerberos")
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key = sspiclient.sign(b"hello")
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sspiclient.sign(b"hello")
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self.assertRaisesHRESULT(
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sspicon.SEC_E_OUT_OF_SEQUENCE, sspiserver.verify, b"hello", key
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)
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def testSequenceSign(self):
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applyHandlingSkips(self._testSequenceSign)
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def _testSequenceEncrypt(self):
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# Only Kerberos supports sequence detection.
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sspiclient, sspiserver = self._doAuth("Kerberos")
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blob, key = sspiclient.encrypt(b"hello")
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blob, key = sspiclient.encrypt(b"hello")
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self.assertRaisesHRESULT(
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sspicon.SEC_E_OUT_OF_SEQUENCE, sspiserver.decrypt, blob, key
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)
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def testSequenceEncrypt(self):
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applyHandlingSkips(self._testSequenceEncrypt)
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def testSecBufferRepr(self):
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desc = win32security.PySecBufferDescType()
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assert re.match(
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"PySecBufferDesc\(ulVersion: 0 \| cBuffers: 0 \| pBuffers: 0x[\da-fA-F]{8,16}\)",
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repr(desc),
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)
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buffer1 = win32security.PySecBufferType(0, sspicon.SECBUFFER_TOKEN)
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assert re.match(
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"PySecBuffer\(cbBuffer: 0 \| BufferType: 2 \| pvBuffer: 0x[\da-fA-F]{8,16}\)",
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repr(buffer1),
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)
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"PySecBuffer(cbBuffer: 0 | BufferType: 2 | pvBuffer: 0x000001B8CC6D8020)"
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desc.append(buffer1)
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assert re.match(
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"PySecBufferDesc\(ulVersion: 0 \| cBuffers: 1 \| pBuffers: 0x[\da-fA-F]{8,16}\)",
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repr(desc),
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)
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buffer2 = win32security.PySecBufferType(4, sspicon.SECBUFFER_DATA)
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assert re.match(
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"PySecBuffer\(cbBuffer: 4 \| BufferType: 1 \| pvBuffer: 0x[\da-fA-F]{8,16}\)",
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repr(buffer2),
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)
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desc.append(buffer2)
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assert re.match(
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"PySecBufferDesc\(ulVersion: 0 \| cBuffers: 2 \| pBuffers: 0x[\da-fA-F]{8,16}\)",
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repr(desc),
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)
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if __name__ == "__main__":
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testmain()
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