67 lines
3.3 KiB
Python
67 lines
3.3 KiB
Python
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# This library is free software: you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation, either
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# version 3 of the License, or (at your option) any later version.
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library. If not, see <http://www.gnu.org/licenses/> or <http://www.gnu.org/licenses/lgpl.txt>.
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import struct
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"""
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This is not the easiest structure to understand, ultimately this is a set structure
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as defined by Microsoft. Channel Binding Tokens set the SHA256 hash of the server
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certificate to the application_data field and then ultimately creates the MD5 hash
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to include in the NTLM auth from there. This class is just designed to create the
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bindings structure which is then used by compute_response.py to do the rest of the
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work.
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For more infor on how this works and how it is derived, this is a great link;
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https://blogs.msdn.microsoft.com/openspecification/2013/03/26/ntlm-and-channel-binding-hash-aka-extended-protection-for-authentication/
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"""
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class GssChannelBindingsStruct(object):
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INITIATOR_ADDTYPE = 'initiator_addtype'
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INITIATOR_ADDRESS_LENGTH = 'initiator_address_length'
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ACCEPTOR_ADDRTYPE = 'acceptor_addrtype'
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ACCEPTOR_ADDRESS_LENGTH = 'acceptor_address_length'
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APPLICATION_DATA_LENGTH = 'application_data_length'
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INITIATOR_ADDRESS = 'initiator_address'
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ACCEPTOR_ADDRESS = 'acceptor_address'
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APPLICATION_DATA = 'application_data'
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def __init__(self):
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self.fields = {}
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self.fields[self.INITIATOR_ADDTYPE] = 0
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self.fields[self.INITIATOR_ADDRESS_LENGTH] = 0
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self.fields[self.ACCEPTOR_ADDRTYPE] = 0
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self.fields[self.ACCEPTOR_ADDRESS_LENGTH] = 0
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self.fields[self.APPLICATION_DATA_LENGTH] = 0
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self.fields[self.INITIATOR_ADDRESS] = b''
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self.fields[self.ACCEPTOR_ADDRESS] = b''
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self.fields[self.APPLICATION_DATA] = b''
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def __setitem__(self, key, value):
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self.fields[key] = value
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def get_data(self):
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# Set the lengths of each len field in case they have changed
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self.fields[self.INITIATOR_ADDRESS_LENGTH] = len(self.fields[self.INITIATOR_ADDRESS])
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self.fields[self.ACCEPTOR_ADDRESS_LENGTH] = len(self.fields[self.ACCEPTOR_ADDRESS])
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self.fields[self.APPLICATION_DATA_LENGTH] = len(self.fields[self.APPLICATION_DATA])
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# Add all the values together to create the gss_channel_bindings_struct
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data = struct.pack('<L', self.fields[self.INITIATOR_ADDTYPE]) + \
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struct.pack('<L', self.fields[self.INITIATOR_ADDRESS_LENGTH]) + \
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self.fields[self.INITIATOR_ADDRESS] + \
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struct.pack('<L', self.fields[self.ACCEPTOR_ADDRTYPE]) + \
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struct.pack('<L', self.fields[self.ACCEPTOR_ADDRESS_LENGTH]) + \
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self.fields[self.ACCEPTOR_ADDRESS] + \
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struct.pack('<L', self.fields[self.APPLICATION_DATA_LENGTH]) + \
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self.fields[self.APPLICATION_DATA]
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return data
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