u2f4

Usage

Overview

The u2f driver provides support for FIDO/U2F-compatible USB security keys. They are Human Interface Devices (HID) which can be accessed via the /dev/u2f/N interface.

The driver is compatible with the read(2), write(2), and ioctl(2) operations of the generic uhid(4) device but only accepts the optional HID ioctl(2) calls from u2f group users.

Hardware

The u2f driver supports FIDO/U2F-compatible USB security keys.

Sysctl variables

The following variables are available as both sysctl(8) variables and loader(8) tunables:

hw.hid.u2f.debug

Debug output level, where 0 is debugging disabled and larger values increase debug message verbosity. Default is 0.

Files

/dev/u2f/*