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#!/bin/sh -e
# ecryptfs-setup-swap
# Copyright (C) 2008 Canonical Ltd.
#
# Authors: Dustin Kirkland <kirkland@canonical.com>
#
# 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; version 2 of the License.
#
# 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, see <http://www.gnu.org/licenses/>.
# The cryptswap setup used here follows a guide published at:
# * http://ubuntumagnet.com/2007/11/creating-encrypted-swap-file-ubuntu-using-cryptsetup
error() {
echo "ERROR: $1" 1>&2
exit 1
}
info() {
echo "INFO: $1"
}
warning() {
echo "WARNING: "
}
usage() {
echo
echo "Usage:"
echo " $0 [-f|--force]"
echo
exit 1
}
# Handle command line options
FORCE=0
while [ ! -z "$1" ]; do
case "$1" in
-f|--force)
FORCE=1
shift 1
;;
*)
usage
;;
esac
done
# Ensure that cryptsetup is available
[ -x /sbin/cryptsetup ] || error "Please install 'cryptsetup'"
# Ensure that we're running with root privileges
[ -w /etc/passwd ] || error "This program must be run with 'sudo', or as root"
# Count swap spaces available
# BUG: We only support setting up a single swap space at this time
if [ $(grep -c "^/" /proc/swaps) -eq 0 ]; then
mem=$(grep "^MemTotal:" /proc/meminfo | awk '{print $2}')
swapsize=$((4*$mem))
info "You do not currently have any swap space defined."
echo
echo "You can create a swap file by doing:"
echo " $ sudo dd if=/dev/zero of=/swapfile count=$swapsize"
echo " $ sudo mkswap /swapfile"
echo " $ sudo swapon /swapfile"
echo
echo "And then re-run $0"
echo
exit 0
elif [ $(grep -c "^/" /proc/swaps) -gt 1 ]; then
info "You have more than one swap space defined."
error "$0 only supports setting up a single swap space"
else
swap=$(grep "^/" /proc/swaps | awk '{print $1}')
fi
# Make sure this is swap space
if ! vol_id "$swap" | grep -qs "ID_FS_TYPE=swap"; then
error "[$swap] does not appear to be swap space"
fi
# Check if this this swap space is already setup for encryption
if /sbin/dmsetup table "$swap" | grep -qs " crypt " 2>/dev/null; then
info "[$swap] already appears to be encrypted."
exit 0
else
# keep going
/bin/true
fi
base=$(basename "$swap")
if grep -qs "^$base.*swap.*cipher" /etc/crypttab 2>/dev/null; then
info "[$swap] already has an entry in /etc/crypttab."
exit 0
fi
if grep -qs "$swap" /etc/initramfs-tools/conf.d/cryptroot 2>/dev/null; then
info "[$swap] already has an entry in /etc/fstab."
exit 0
fi
# Ensure available dev mapper name 'cryptswap'
if grep -qs "^cryptswap" /etc/crypttab; then
error "There appears to be a cryptswap entry in /etc/cryptab; aborting."
fi
# Ensure available fstab entry
if grep -qs "^/dev/mapper/cryptswap" /etc/fstab; then
error "There appears to be a cryptswap entry in /etc/fstab; aborting."
fi
# Ensure that the existing swap space exists in fstab
if grep -qs "^$swap" /etc/fstab; then
sed -i "s:^$swap:\#$swap:" /etc/fstab
info "Commented out your unencrypted swap from /etc/fstab"
else
info "Your swap space isn't currently listed in /etc/fstab"
fi
##########################################################################
# Warn the user about breaking hibernate mode
if [ "$FORCE" != 1 ]; then
echo
warning
echo " An encrypted swap is required to help ensure that encrypted files"
echo " are not leaked to disk in an unencrypted format."
echo
echo " HOWEVER, THE SWAP ENCRYPTION CONFIGURATION PRODUCED BY THIS PROGRAM"
echo " WILL BREAK HIBERNATE/RESUME ON THIS SYSTEM!"
echo
echo " NOTE: Your suspend/resume capabilities will not be affected."
echo
echo -n "Do you want to proceed with encrypting your swap [y/N]: "
CONFIRM=`head -n1`
echo
if [ "$CONFIRM" != "y" -a "$CONFIRM" != "Y" ]; then
echo
info "Aborting."
echo
exit 0
fi
fi
##########################################################################
info "Setting up swap: [$swap]"
# Add crypttab entry
echo "cryptswap $swap /dev/urandom swap,cipher=aes-cbc-essiv:sha256" >> /etc/crypttab
# Add fstab entry
echo "/dev/mapper/cryptswap none swap sw 0 0" >> /etc/fstab
# Turn swap off
swapoff -a
# Restart cryptdisks
/etc/init.d/cryptdisks restart
# Turn the swap on
swapon -a
info "Successfully setup encrypted swap!"
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