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

[Greg KH]

On Mon, Oct 27, 2014 at 04:12:30PM -0700, Andy Lutomirski wrote:
> 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.

I don't understand, what would a udev rule do with these devices?
Shouldn't they be exported automatically using the hid "raw" interface
so that userspace can talk to them?  What else needs to be done?

thanks,

greg k-h