Python impacket.dcerpc.v5.samr.KERB_KEY_DATA_NEW Examples

The following are 1 code examples of impacket.dcerpc.v5.samr.KERB_KEY_DATA_NEW(). You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may also want to check out all available functions/classes of the module impacket.dcerpc.v5.samr , or try the search function .
Example #1
Source File: raiseChild.py    From Slackor with GNU General Public License v3.0 4 votes vote down vote up 
def __decryptSupplementalInfo(self, record, prefixTable=None):
        # This is based on [MS-SAMR] 2.2.10 Supplemental Credentials Structures
        plainText = None
        for attr in record['pmsgOut']['V6']['pObjects']['Entinf']['AttrBlock']['pAttr']:
            try:
                attId = drsuapi.OidFromAttid(prefixTable, attr['attrTyp'])
                LOOKUP_TABLE = self.ATTRTYP_TO_ATTID
            except Exception as e:
                logging.debug('Failed to execute OidFromAttid with error %s' % e)
                # Fallbacking to fixed table and hope for the best
                attId = attr['attrTyp']
                LOOKUP_TABLE = self.NAME_TO_ATTRTYP

            if attId == LOOKUP_TABLE['supplementalCredentials']:
                if attr['AttrVal']['valCount'] > 0:
                    blob = b''.join(attr['AttrVal']['pAVal'][0]['pVal'])
                    plainText = drsuapi.DecryptAttributeValue(self.__drsr, blob)
                    if len(plainText) < 24:
                        plainText = None

        if plainText:
            try:
                userProperties = samr.USER_PROPERTIES(plainText)
            except:
                # On some old w2k3 there might be user properties that don't
                # match [MS-SAMR] structure, discarding them
                return
            propertiesData = userProperties['UserProperties']
            for propertyCount in range(userProperties['PropertyCount']):
                userProperty = samr.USER_PROPERTY(propertiesData)
                propertiesData = propertiesData[len(userProperty):]
                if userProperty['PropertyName'].decode('utf-16le') == 'Primary:Kerberos-Newer-Keys':
                    propertyValueBuffer = unhexlify(userProperty['PropertyValue'])
                    kerbStoredCredentialNew = samr.KERB_STORED_CREDENTIAL_NEW(propertyValueBuffer)
                    data = kerbStoredCredentialNew['Buffer']
                    for credential in range(kerbStoredCredentialNew['CredentialCount']):
                        keyDataNew = samr.KERB_KEY_DATA_NEW(data)
                        data = data[len(keyDataNew):]
                        keyValue = propertyValueBuffer[keyDataNew['KeyOffset']:][:keyDataNew['KeyLength']]

                        if  keyDataNew['KeyType'] in self.KERBEROS_TYPE:
                            # Give me only the AES256
                            if keyDataNew['KeyType'] == 18:
                                return hexlify(keyValue)

        return None