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Subject: Re: EXT :[openc2] Re: Request-response over pub/sub for openC2
Sudeep,
As I dive back into the MQTT spec, and look again at your message I think you've only answered part of Joe's original question. The core of Joe's question was whether you'd recommend the channel(s) for publishing commands should be structured in an action-centric manner or a device-centric manner, based on McAfee's experience with pub/sub messaging. In your reply you focused on how responses would be routed back to the originating Producer, rather than the topic structure for sending commands. I looked at your OpenDXL transfer spec draft and that currently doesn't provide any guidance regarding command topic structure either, beyond starting with /oc2/{version}/
In a somewhat related question, does OpenDXL permit publishing wildcards, or is any individual message only published to a single topic (which could have many subscribers)? I ask to compare / contrast with MQTT v3.1.1., where para 3.3.2.1 of the v3.1.1 spec explicitly precludes wildcard characters in the PUBLISH packet topic.
Dave
David Lemire Systems Engineer HII Mission Driven Innovated Solutions (HII-MDIS) Technical Solutions Division
302 Sentinel Drive | Annapolis Junction, MD 20701 Work (301) 575-5190 | Mobile (443) 535-1182 From: openc2@lists.oasis-open.org <openc2@lists.oasis-open.org> on behalf of Das, Sudeep <Sudeep_Das@McAfee.com>
Sent: Monday, July 13, 2020 4:20:49 PM To: duncan sfractal.com; openc2@lists.oasis-open.org Subject: EXT :[openc2] Re: Request-response over pub/sub for openC2
More as a spec than an example, here is the McAfee opendxl messaging constructs for pub-sub and req-res https://opendxl.github.io/opendxl-client-python/pydoc/dxlclient.message.html
[opendxl.github.io] If you look at the request message structure, it includes a field for the response topic.
From: "duncan sfractal.com" <duncan@sfractal.com>
Could you give an example? It would be particularly useful for a command (eg add a firewall rule, block an ip, etc) as the emphasis is on the C2 in openc2 iPhone, iTypo, iApologize From: openc2@lists.oasis-open.org <openc2@lists.oasis-open.org> on behalf of Das, Sudeep <Sudeep_Das@McAfee.com> Openc2 members, I received a request for technical assistance on openc2 over mqtt spec from Mr Brule earlier today. I am responding to oasis relay as recommended by Mr Brule.
The discussion is around setting up topics. > Would you set up a topic that is 'action' so an orchestrator would
> post a 'deny evil_domain' then would you set up another topic 'response_action'
> so any actuator that could act on the deny evil domain would post
> its ack on the 'response_deny' channel? Or would you guys make the
>topics more device centric, so there would be a topic that is 'gateway_routers' > and the orchestrator posts the commands there then each
> router would have its own topic 'router_one', 'router_two' etc. to post its response. There are a few challenges to the openc2 spec in terms of pub sub. Openc2 messaging specifies request-response semantics, which is a different message pattern vis-à-vis pub-sub. The way we may manage req-res over pub-sub is as below (as
implemented in McAfee opendxl )
Happy to discuss further on the thread Sudeep Das Principal Engineer McAfee LLC |
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