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#!/bin/bash
# An example script which when placed in /etc/mkinitrd/scripts will enable
# the use of a USB stick to provide keys at boot time.
modules="usb-storage sd-mod nls_cp437 ehci-hcd uhci-hcd nls_iso8859-1"
mkdir $INITRDDIR/keys
cp /boot/keys/* $INITRDDIR/keys
for mod in $modules; do
for ko in `modprobe --set-version $VERSION --show-depends $mod | cut -b8-`; do
install -d $INITRDDIR/${ko%/*}
install $ko $INITRDDIR/$ko
done
done
cat <<EOF >$INITRDDIR/bin/xor
perl -e 'open(F2,@ARGV[0]) && open(F1,@ARGV[1]) or die "
Usage: $0 <file1> <file2>\n"; print $buf1 ^ $buf2 while (read (F1, $buf1,65536) &
& read (F2,$buf2,65536));' -- $STICKMNT/$STICKKEYDIR/$KEYNAME $HOSTKEYDIR/$HOSTKEY | $CRYPTSETUP create $CRYPTVOLNAME $CRYPTRAWVOL
EOF
cat <<EOF >$INITRDDIR/bin/delay
/bin/sleep 0.5s
EOF
cat <<EOF >$INITRDDIR/keyscripts/usbkeys
modprobe uhci-hcd
modprobe ehci-hcd
modprobe usb-storage
modprobe sd-mod
#read old nil < /proc/sys/kernel/printk
#echo 0 > /proc/sys/kernel/printk
echo
echo
echo "Root disk is encrypted. Please provide keys on a usb stick."
echo
echo -n "Waiting for keys "
while [ ! -f /dev2/rootkey ]; do
echo -n "."
/bin/delay
for d in /devfs/scsi/host*/bus*/target*/lun*/part1 \\
/devfs/scsi/host*/bus*/target*/lun*/disc; do
if ! mount -n \$d /mnt -o ro -t vfat 2>/dev/null >/dev/null; then continue; fi
for i in keys/*; do
if [ -f /mnt/\${i%.*}.key ]; then
/bin/xor /mnt/\${i%.*}.key \$i > /dev2/rootkey
fi
done
umount -n /mnt
done
done
echo " Found"
#echo $old > /proc/sys/kernel/printk
if [ -f /dev2/rootkey ]; then
/sbin/cryptsetup -v -d /dev2/rootkey -c \$cipher_mode create \$dmname \$device
fi
EOF
chmod +x $INITRDDIR/keyscripts/usbkeys
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