[systemd-devel] Writing a udev rule for U2F security tokens?

[Andy Lutomirski]

Hi-

I'd like to write a generic udev rule for U2F security tokens and to
possibly get it integrated into systemd / udev, but I'm not sure how
to write it in the first place.

U2F tokens are USB HID devices that have a usage page 0xF1D0 that
contains usage 0x01.  The rule should match any hidraw device with
that property.  Can this be done without a user helper?  Is there an
existing helper in which it would make sense to add such a check?

Here's the draft USB forum allocation:

http://www.usb.org/developers/hidpage/HUTRR48.pdf

Here's the draft spec from the FIDO Alliance:

https://fidoalliance.org/specs/fido-u2f-HID-protocol-v1.0-rd-20141008.pdf

In practice, I expect little change between the draft and final specs,
since these devices are already for sale and Chromium supports them.

Thanks,
Andy