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I am turning my raspberry pi prototype device into a market product. The data and the program running on the pi must be protected. But we have a USB webcam attached to it (provided by us, hence we know its details, id, etc). So I want to ensure that the end-user doesn't plug anything (keyboard, mouse, pen drives, etc) into the USB port except that particular webcam. How can I accomplish this?

Note: I don't want the overhead labour of desoldering the USB port and connector, and soldering the webcam's bare wires on to the pi. That would be the last resort.

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    This may help: unix.stackexchange.com/questions/63199/…
    – Craig
    Jan 7, 2019 at 21:45
  • Hot glue is probably easiest. Glue your camera to your RPi. Glue a blank USB plug into the other three sockets to prevent anything alien being inserted.
    – Dougie
    Jan 7, 2019 at 23:06
  • @Craig Thanks! That was exactly what I had been looking for. Would it disable ethernet access over USB as well (through a USB data cable)? If yes, can you please post it as an answer so that I can mark it as correct?
    – Mythos
    Jan 8, 2019 at 20:02

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udev rules are probably the best way to handle this. This answer is probably a good starting point.

Basically you would create a rule that matches all devices except yours and have udev disable the device when it is added.

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