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|
#!/bin/sh
# FILE: mount.crypt -- mount a dm-crypt encrypted volume
# AUTHOR: W. Michael Petullo <mike@flyn.org>
# DATE: 18 April 2004
#
# Copyright (C) 2004 W. Michael Petullo <mike@flyn.org>
# All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
LOSETUP=/sbin/losetup
CRYPTSETUP=/sbin/cryptsetup
MOUNT=/bin/mount
OPTIONS=""
USAGE="[-o options] dev dir
-o options set the mount options [ $OPTIONS ]"
_losetup() {
DEVICE=$1
LOOPDEV=0
while [ $LOOPDEV -le 15 ]; do
if $LOSETUP /dev/loop${LOOPDEV} $DEVICE 2> /dev/null; then
echo /dev/loop${LOOPDEV}
return 0
fi
LOOPDEV=$(($LOOPDEV + 1))
done
echo "${0##*/}: error setting up loop device for $DEVICE" >&2
exit 1
}
while :;
do case "$1" in
-h | "-?" )
echo -e usage: ${0##*/} "$USAGE" >&2
exit 1 ;;
-o )
OPTIONS=$2
shift ;;
-?* )
echo "${0##*/}: unrecognised option: $1" >&2
exit 1 ;;
* )
break ;;
esac
shift
done
if [ -z "$1" ]; then
echo "${0##*/}: device to mount not specified" >&2
fi
if [ ! -f "$1" ] && [ ! -b "$1" ]; then
echo "${0##*/}: $1 is not a block device or file" >&2
exit 1
fi
if [ ! -d "$2" ]; then
echo "${0##*/}: $2 is not a directory" >&2
exit 1
fi
CIPHER=""
KEYSIZE=""
HASH=""
LOOP=false
MOUNTOPTIONS=""
IFS=","
for opt in $OPTIONS; do
KEY=`echo $opt | awk -F = '{ print $1 }'`
VAL=`echo $opt | awk -F = '{ print $2 }'`
case $KEY in
# FIXME: use cipher instead of encryption to avoid conflicting
# with mount's built-in (cryptoloop) encryption argument.
cipher )
CIPHER="$VAL"
;;
keysize )
KEYSIZE="$VAL"
;;
hash )
HASH="$VAL"
;;
loop )
LOOP=true
;;
* )
if [ -z "$MOUNTOPTIONS" ]; then
MOUNTOPTIONS="$opt"
else
IFS=""
MOUNTOPTIONS="$MOUNTOPTIONS,$opt"
fi
;;
esac
done
# FIXME: blind replacement of / with _ may be a bad idea.
if [ x"${LOOP}" = xtrue ]; then
DEVICE=`_losetup $1`
DMDEVICE=`echo $DEVICE | sed 's/\//_/g'`
else
DEVICE=$1
DMDEVICE=`echo $DEVICE | sed 's/\//_/g'`
fi
CIPHEROPT="aes"
if [ -n "$CIPHER" ]; then
CIPHEROPT="-c $CIPHER"
fi
HASHOPT="ripemd160"
if [ -n "$HASH" ]; then
HASHOPT="-h $HASH"
fi
KEYSIZEOPT="256"
if [ -n "$KEYSIZE" ]; then
KEYSIZEOPT="$KEYSIZE"
fi
$CRYPTSETUP -c $CIPHEROPT -h $HASHOPT -s $KEYSIZEOPT create $DMDEVICE $DEVICE
if [ $? != 0 ]; then
echo "${0##*/}: error creating $DMDEVICE" >&2
[ x"$LOOP" = xtrue ] && $LOSETUP -d $DEVICE
exit 1
fi
if [ -z "$MOUNTOPTIONS" ]; then
# $2 might not exist as mount can try to read it from /etc/fstab
$MOUNT /dev/mapper/$DMDEVICE $2
if [ $? != 0 ]; then
echo "${0##*/}: error mounting $DMDEVICE" >&2
$CRYPTSETUP remove $DMDEVICE
[ x"$LOOP" = xtrue ] && $LOSETUP -d $DEVICE
exit 1
fi
else
$MOUNT -o $MOUNTOPTIONS /dev/mapper/$DMDEVICE $2
if [ $? != 0 ]; then
echo "${0##*/}: error mounting $DMDEVICE" >&2
$CRYPTSETUP remove $DMDEVICE
[ x"$LOOP" = xtrue ] && $LOSETUP -d $DEVICE
exit 1
fi
fi
|
