OPC UA protocol

[glaslos]

OPC UA seems interesting as it allows file transfer: http://en.wikipedia.org/wiki/OPC_Unified_Architecture

http://opycua.sourceforge.net/tutorial/hello.html http://sourceforge.net/p/opycua/code/ci/default/tree/

[Sp3ctr3]

From what I understand, to implement OPC UA we need to:

1. Create a OPC UA server in python.
2. Start it along with the http,snmp,modbus and s7 servers and add it to gevent. 3)Log all incoming connections (Just the IP or the data too?) Am I missing anything? I'm thinking of creating a separate directory for it like the other protocols.

[creolis]

5. Implement unit tests ... this is what I try to get away without - but Lukas is a man with eagle eyes :P
6. extend the manual with necessary configuration directives you added to the configuration XML

Of course you're right - creating a seperate directory for it is the way to go. For the logging - you just pass the information as requested by the logging module - so all the fields requested by the logging function.

I'm really curious about the OPC UA server :) great having you on board :)

[Sp3ctr3]

Cool! I'll get started then. So just logging the IP of the attacker would do right? I'm interested too! And it's great to be involved in this great project!

[creolis]

This is how logging is handled in the HTTP module:

    def log(self, version, request_type, addr, request, response=None):

        log_dict = {'remote': addr,
                    'timestamp': datetime.utcnow(),
                    'data_type': 'http',
                    'data': {0: {'request': '{0} {1}: {2}'.format(version, request_type, request)}}}

        if response:
            logger.info('{0} response to {1}: {2}'.format(version, addr, response))
            log_dict['data'][0]['response'] = '{0} response: {1}'.format(version, response)

        self.server.log_queue.put(log_dict)

For each request, the remote address, timestamp, service type and the request itself is collected, if we send a response to the remote address, we attach the response (in this case the response code) too.

[glaslos]

As OPC is used for file transfer, one of the goals would be storing any files to a separate directory and create an md5 entry in the data section of the log entry so we are able to link it back to the attacker.

[glaslos]

This seems interesting: http://www.f-secure.com/weblog/archives/00002718.html This sample looks for OPC devices.

[glaslos]

This seems to be a good starting point: http://openopc.sourceforge.net/api.html

[glaslos]

OPC simulator: http://www.gray-box.net/download_graysim.php