Enable FIDO U2F on Linux

By default, only root can access the FIDO U2F device on Linux.  To change this:

• Insert the U2F device.  Note the device number and execute the following command to print out the info. e.g.

sudo udevadm info -a /dev/usb/hiddev1

• Take note of the attributes. e.g. for my HyperFIDO device:

......

ATTRS{idProduct}=="0880"

ATTRS{idVendor}=="096e"

ATTRS{ltm_capable}=="no"

ATTRS{manufacturer}=="HS"

ATTRS{maxchild}=="0"

ATTRS{product}=="HyperFIDO Token"

......

• Create a new rule file under /etc/udev/rules.d and grant permission to all users. e.g. create a file named "10-fido-key.rules" and add the followings:

SUBSYSTEMS=="usb", ATTRS{idVendor}=="096e", ATTRS{idProduct}=="0880", TAG+="uaccess"

• Re-insert the U2F device.