Python impacket.dcerpc.v5.samr.KERB_STORED_CREDENTIAL_NEW Examples

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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