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Old 05-13-2014, 01:45 PM   #1
slaka
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Registered: Oct 2012
Distribution: Slackware 14.0 86x
Posts: 43

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Unlocking LUKS with keyfile on USB


I have formatted USB stick to fat
Code:
mkfs.fat -N USBKEY /dev/sdX1
made keyfile and moved it into USB stick, created initrd accordingly
Code:
#echo password > /mnt/USBKEY/keys/key.luks
#cryptsetup luksAddKey /dev/sdXY /mny/USBKEY/keys/key.luks
#mkinitrd -c -k 3.2.29-smp -m ext3 -f ext3 -r /dev/cryptvg/root -C /dev/sdx2 -L -K LABEL=USBKEY:/keys/key.luks
Problem is that I am prompted for password during boot, I have tried to insert USB stick right after booting process starts and obviously having it inserted during whole boot/reboot process.
 
Old 05-16-2014, 03:04 PM   #2
mostlyharmless
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Registered: Jan 2008
Distribution: Arch/Manjaro, might try Slackware again
Posts: 1,851
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Rep: Reputation: 284Reputation: 284Reputation: 284
Maybe your usb drive isn't being recognized

My mkinitrd is
Code:
 mkinitrd -c -k 3.13.2 -f ext4 -r /dev/cryptvg/root -m usb-storage:xhci-hcd:usbhid:hid_generic:mbcache:jbd2:ext4:ext2:vfat:hid:usbhid -C /dev/sda3 -L -u -o /boot/initrd-3.13.2.gz -K UUID=XXXX-XXXX:/keyfile
Note that I use the UUID rather than LABEL to avoid different mount points, either should work. The keyfile is in the root of the USB stick.

For you that'd be
Code:
 mkinitrd -c -k 3.2.29-smp -f ext3 -r /dev/cryptvg/root -m usb-storage:xhci:hcd:usbhid:hid_generic:mbcache:ext3:vfat:hid:usbhid -C /dev/sda2 -L -u LABEL=USBKEY:/keys/key.luks
Note the modules included in the initrd for usb, usbstorage and vfat. You might not need all of those other modules.

Also, I'm not sure your path to the keyfile is correct. Had you mounted your stick into /mny? If your stick is in at boot time, I expect /keys to be in the root of the USB drive.
 
  


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