Reverse-engineering the UniFi inform protocol

(tamarack.cloud)

76 points | by baconomatic 4 hours ago ago

27 comments

  • ctippett 2 hours ago

    Nice trick. Just a heads up that I had to whitelist your domain as NextDNS blocked it for being newly registered.

    Given this thread will probably attract other Unifi users... has anyone had success migrating from MongoDB to something like FerretDB?

    I played around with getting this to work a few weeks ago and found that day-to-day it works without issue, but restoring a backup will error since it relies on some unsupported Mongo semantics (renaming collections iirc).

    • adobrawy 9 minutes ago

      How are you performing backup of FerratDB? Are you using MongoDB tools, or are you using PostgreSQL-specific tools?

    • paulddraper 2 hours ago

      What does an admin do about NextDNS blocks?

      • bastawhiz an hour ago

        If you subscribe to the mindset of "new domains are likely to be bad" you just deal with a steady stream of allowlist requests from your users until the end of time. There will be new domains until the end of time, and site owners shouldn't be doing anything extra (imo) to justify their existence to admins. If you use a firewall voluntarily and that firewall blocks sites that are legitimate, that's on you, not the site owner.

        We get this a lot at my job, where many customers' admins block s3 buckets by default. We give our customers a list of hostnames to allowlist and if they can't figure it out, that's on them.

  • mrweasel 2 hours ago

    It seems like a pretty tall order, but I really want an open source access point controller daemon that knows how to provision and manage a wide variety of APs from different manufacturers.

    So you'd have one services that can provision Ubiquity, MikroTik, TPLink and other APs and manage the clients.

    • baconomatic an hour ago

      Now that would be interesting! Multi-vendor support is on the radar, but haven't started looking into it much yet.

  • CptKriechstrom 2 hours ago

    Do I miss something? How do you adopt the device in the first place? If you have to SSH into the device and set the inform URL manually could't you just route the request based on the request hostname?

    • baconomatic 2 hours ago

      Yep, once you set-inform the host header handles the routing. This in particular is most useful for things like DHCP Option 43, where devices only get an IP.

      • CptKriechstrom an hour ago

        But if you only got that IP and a MAC-Address - how do you know which tenant is supposed to adopt the device?

  • bxbdbehdbdb 21 minutes ago

    I don't quite get the reason for sniffing the packets. Wouldn't it be simpler to just run multiple VMs on one host to be multi tenant?

    • baconomatic 16 minutes ago

      It would definitely be simpler, however the routing issue still stands. You would need to have a public IP for every VM, which is getting less practical. The MAC-based proxy makes it so we only need one IP and we can worry about the routing within our platform instead.

  • devmor 3 hours ago

    > ("TNBU" is "UNBT" backwards, presumably UniFi Broadcast Technology.)

    This seems like an odd misunderstanding, especially because the correct inversion “UBNT” is the default login name for most UniFi web UIs.

    You might have a bit of dyslexia, OP!

    • baconomatic 2 hours ago

      You might be onto something there! But yes, good catch, I'll get that updated.

    • dwood_dev 3 hours ago

      ubnt has been the ubiquiti default login at least back to 2010 when I started using their products, before UniFi was a brand. I always assumed it was short for Ubiquiti Networks.

      • hrimfaxi 2 hours ago

        Sure, but the parent was saying this part was odd:

        > "TNBU" is "UNBT" backwards

        TNBU is clearly NOT uNbt backwards.

        • idorosen 2 hours ago

          Using the network byte ordering (big endian) of UBNT as the magic number in the protocol is a nice touch.

          • EvanAnderson 2 hours ago

            I believe they used MIPS processors in their early gear, so that makes sense.

            • mikepurvis an hour ago

              A lot of companies in that space did then. I was at a robotics company at the time and we experimented with mikrotik routerboards + the various long-range Ubiquiti wifi modules, some of which are even still listed on the website: https://techspecs.ui.com/uisp/accessory-tech/xr (though not the 900 MHz XR9, which was arguably one of the most interesting for long range comms)

  • scottlamb 2 hours ago

    Bit of a thread-jack, but has anyone reverse-engineered the UniFi camera adoption protocol? I was surprised to discover that, unlike the APs, the cameras can't be adopted through the Unifi Software Controller that you can just throw into a Docker container. You're supposed to do that through their NVR appliance (Unifi Protect). I was hoping to just use them with my open-source NVR. They seem to be about the only option for a reasonably priced, larger image sensor camera that is not made by a company participating in the Uyghur genocide (Hikvision, Dahua, Univision, Huawei).

    I found https://community.home-assistant.io/t/unifi-cameras-without-... in which someone sshed in, edited some config files by hand, and got streaming to work for the current boot. One could probably take that a bit further and, you know, save the config to flash. But it'd be nice to just do it the way their controller does and know it's going to work for future firmware updates and such.

    They also stream by connecting to your NVR with modified version of flv, rather than you connecting to them with RTSP, which is annoying but can be worked around.

    • ImPostingOnHN 12 minutes ago

      If you want to bypass Unifi Protect, what sort of "adoption" are you thinking of? AFAIK, "adoption" is a Unifi Protect thing. Otherwise it's just a device on your network that you can configure Frigate etc. to connect to and pull streams.

      • scottlamb a minute ago

        Changing the credentials for web access (firmware upgrade, janky jpeg-based live stream, etc.) and ssh access from the default ubnt:ubnt. Surprisingly, I don't see a page for this in the web UI, and the `password` command in the CLI is ineffective. I haven't looked around the filesystem.

        Setting where it sends the video stream.

        Configuring video settings, zone detections, etc. I found a video going through them here: <https://youtu.be/URam5XSFzuM?si=8WK4Yghh9kidZe6c&t=279> Just about any other camera lets you change this stuff through the camera's built-in web interface and/or ONVIF. Ubiquitis apparently don't.

        > Otherwise it's just a device on your network that you can configure Frigate etc. to connect to and pull streams.

        No, it connects to you!

  • opengrass an hour ago

    Controller uses way to much RAM compared to OpenWISP and good luck if a device is EOL. Lots of $10 USG-3P's out there.

  • voidUpdate 2 hours ago

    Is it just me that pretty much cannot read most of the text in the "Reading the MAC" code block? I don't know if it's because I use dark mode, but some of the text is #24292E on top of #141A16, which for me at least is practically invisible

    • baconomatic 2 hours ago

      Sorry about that, I typically use light mode, fixed and deployed!