[systemd-devel] WebUSB

[Kenneth Rohde Christiansen]

Web USB can only grab devices which has special Web USB headers. It can not
grab any USB device.

https://wicg.github.io/webusb/#webusb-descriptors

Kenneth

On Mon, Jan 9, 2017 at 10:38 AM Greg KH <greg at kroah.com> wrote:

> On Mon, Jan 09, 2017 at 10:20:33AM +0100, Lars Knudsen wrote:
> > Hi,
> >
> > I am currently looking into how we can make using WebUSB devices less
> painful
> > for users on Linux.
> >
> > The main purpose of WebUSB (as far as I can see) is to enable certain
> CDC (in
> > particular - but not limited to) devices communicate directly with
> browsers
> > visiting certain trusted sites (listed inside a binary object store -
> sent on
> > initial handshake).
> >
> > The spec is here: https://wicg.github.io/webusb/ (already running fine
> in
> > chrome stable)
> > Examples:
> > https://www.youtube.com/watch?v=Z1Nk2hH2wFE
> > https://www.youtube.com/watch?v=o7wGt9RfHVA
> > https://twitter.com/denladeside/status/817451203076427783
> >
> > I'm guessing the solution will consist of 2 parts:
> >
> > 1. make sure no WebUSB device is picked up by modemmanager (modemmanager
> task)
>
> Given that webusb can grab any device, how are you going to do that?
>
> > 2. make sure that webusb devices will be somehow accessible to be used
> by a
> > browser running with user permissions (current temp solution listed here:
> > adding user to plugdev, adding 0664 permissions to device: https://
> > developers.google.com/web/updates/2016/03/access-usb-devices-on-the-web
> )
> > (udev/systemd task).
> >
> > For 2. we need to either making all webusb devices accessible or find
> some
> > other way the browsers can - in a generic way - gain access.  In all
> cases,
> > it's important that no USB interfaces has been pre-claimed by the system
> (e.g.
> > by cdc_acm) or it should be possible for the browser to throw off the
> claims.
>
> Userspace can disconnect any device from a driver if it wants to, but
> you aren't going to be able to "beat" the kernel at binding to a device
> if the driver.
>
> thanks,
>
> greg k-h
>
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