YubiKey lock screen
From D3xt3r01.tk
What
I'm trying to make my fedora 17 ( gnome3 ) desktop lock the screen when it sees my yubikey removed from the usb slot.
HOW
Get the serial, idVendor, idProduct of the thing.
udevadm info -a -p $(udevadm info -q path -n /dev/hidraw0)
Create a /etc/udev/rules.d/85-screen-lock-toggle.rules
SUBSYSTEM=="usb", ACTION=="remove", ENV{ID_VENDOR_ID}=="1050", ENV{ID_MODEL_ID}="0010", RUN+="/usr/local/bin/gnome-lock enable"
SUBSYSTEM=="usb", ACTION=="add", ENV{ID_VENDOR_ID}=="1050", ENV{ID_MODEL_ID}=="0010", RUN+="/usr/local/bin/gnome-lock disable"
Also you should probably reload the rules:
udevadm control --reload-rules
And you should create the following script (you'll probably have to comment out default requiretty in /etc/sudoers) :
~# cat /usr/local/bin/gnome-lock
#!/bin/bash
log="/tmp/yubi_lock_log"
yubimap="/etc/yubikey_decmappings"
echo "$(date) $(whoami) '$0' '$1'" >> ${log}
user=`ps aux | grep gnome-screensaver | head -n 1 | awk '{print $1}'`
export DISPLAY=":0"
if [ "$1" == "enable" ]
then
if [ -n ${user} -a "$(grep -c ${user}:${ID_SERIAL_SHORT} ${yubimap})" == "1" ]
then
sudo -u ${user} /usr/bin/gnome-screensaver-command -l >> ${log} 2>&1
fi
else
if [ -n ${user} -a "$(grep -c ${user}:000$(ykinfo -q -s) ${yubimap})" == "1" ]
then
sudo -u ${user} /usr/bin/gnome-screensaver-command -d >> ${log} 2>&1
fi
fi
Your /etc/yubikey_decmappings should contain user:000key, padding with 000(you can see that in env) (which key should be able to unlock what login if in multiple desktop environment )
ISSUES
On an arch environment it has been said you need some other exports for this to work...
GNOME_SCREENSAVER_PROC=`ps xa | grep gnome-screensaver | head -n 1 | awk '{print $1}'`
export `grep -z DBUS_SESSION_BUS_ADDRESS /proc/$GNOME_SCREENSAVER_PROC/environ`
Also, you could probably use dbus to do the job for locking/unlocking
sudo -u ${user} dbus-send --type=method_call --dest=org.gnome.ScreenSaver /org/gnome/ScreenSaver org.gnome.ScreenSaver.SetActive boolean:false # for unlock
sudo -u ${user} dbus-send --type=method_call --dest=org.gnome.ScreenSaver /org/gnome/ScreenSaver org.gnome.ScreenSaver.Lock # for lock