/usr/bin/ecryptfs-setup-swap is in ecryptfs-utils 111-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | #!/bin/sh -e
# ecryptfs-setup-swap
# Copyright (C) 2008 Canonical Ltd.
#
# Authors: Dustin Kirkland <kirkland@ubuntu.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
TEXTDOMAIN="ecryptfs-utils"
error() {
echo `gettext "ERROR:"` "$@" 1>&2
exit 1
}
info() {
echo `gettext "INFO:"` "$@"
}
warn() {
echo `gettext "WARNING:"` "$@" 1>&2
}
usage() {
echo
echo `gettext "Usage:"`
echo " $0 [-f|--force] [-n|--no-reload]"
echo
exit 1
}
# Handle command line options
FORCE=0
while [ ! -z "$1" ]; do
case "$1" in
-f|--force)
FORCE=1
shift 1
;;
-n|--no-reload)
NO_RELOAD=1
shift 1
;;
*)
usage
;;
esac
done
# Ensure that cryptsetup is available
[ -x /sbin/cryptsetup ] || error `gettext "Please install"` "'cryptsetup'"
# Ensure that we're running with root privileges
[ -w /etc/passwd ] || error `gettext "This program must be run with 'sudo', or as root"`
# Count swap spaces available
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 `gettext "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 `gettext "And then re-run"` "$0"
echo
exit 0
fi
swaps=$(grep "^/" /proc/swaps | awk '{print $1}')
filtered_swaps=$(
for swap in $swaps; do
# Make sure this is swap space
if [ "$(blkid -o value -s TYPE $swap)" != "swap" ]; then
warn "[$swap]" `gettext "does not appear to be swap space, skipping."`
continue
fi
if [ "${swap#/dev/ram}" != "$swap" ] || [ "${swap#/dev/zram}" != "$swap" ]; then
warn "[$swap]" `gettext "is a RAM device, skipping."`
continue
fi
# Check if this swap space is already setup for encryption
if /sbin/dmsetup table "$swap" 2>/dev/null | grep -qs " crypt "; then
warn "[$swap]" `gettext "already appears to be encrypted, skipping."`
continue
fi
base=$(basename "$swap")
if grep -qs "^$base.*swap.*cipher" /etc/crypttab 2>/dev/null; then
warn "[$swap]" `gettext "already has an entry in /etc/crypttab, skipping."`
continue
fi
if grep -qs "$swap" /etc/initramfs-tools/conf.d/cryptroot 2>/dev/null; then
warn "[$swap]" `gettext "already has an entry in /etc/crypttab, skipping."`
continue
fi
echo $swap
done
)
swaps="$filtered_swaps"
if [ -z "$swaps" ]; then
warn "There were no usable swap devices to be encrypted. Exiting."
exit 0
fi
##########################################################################
# Warn the user about breaking hibernate mode
if [ "$FORCE" != 1 ]; then
echo
echo `gettext "WARNING:"`
echo `gettext "An encrypted swap is required to help ensure that encrypted files are not leaked to disk in an unencrypted format."`
echo
echo `gettext "HOWEVER, THE SWAP ENCRYPTION CONFIGURATION PRODUCED BY THIS PROGRAM WILL BREAK HIBERNATE/RESUME ON THIS SYSTEM!"`
echo
echo `gettext "NOTE: Your suspend/resume capabilities will not be affected."`
echo
echo -n `gettext "Do you want to proceed with encrypting your swap?"` "[y/N]: "
CONFIRM=`head -n1`
echo
if [ "$CONFIRM" != "y" -a "$CONFIRM" != "Y" ]; then
echo
info `gettext "Aborting."`
echo
exit 0
fi
fi
##########################################################################
i=0
for swap in $swaps; do
info `gettext "Setting up swap:"` "[$swap]"
uuid=$(blkid -o value -s UUID $swap)
# /etc/fstab might use a symlink like /dev/mapper/ubuntu--vg-swap_1
links=$(for d in $(udevadm info --query=symlink -n $swap); do echo /dev/$d; done)
for target in "UUID=$uuid" $swap $links; do
if [ -n "$target" ] && grep -qs "^$target\s\+" /etc/fstab; then
sed -i "s:^$target\s\+:\#$target :" /etc/fstab
warn "Commented out your unencrypted swap from /etc/fstab"
fi
done
while :; do
i=$((i+1))
[ -e "/dev/mapper/cryptswap$i" ] || break
done
# If this is a GPT partition, mark it as no-auto mounting, to avoid
# auto-activating it on boot
if [ "$(blkid -p -s PART_ENTRY_SCHEME -o value "$swap")" = "gpt" ]; then
drive="${swap%[0-9]*}"
partno="${swap#$drive}"
if [ -b "$drive" ]; then
if printf "x\np\n" | fdisk "$drive" | grep -q "^$swap .* GUID:.*\b63\b"; then
echo "$swap is already marked as no-auto"
else
# toggle flag 63 ("no auto")
echo "marking GPT swap partition $swap as no-auto..."
# unfortunately fdisk fails on "cannot re-read part table" and is very verbose
printf "x\nS\n$partno\n63\nr\nw\n" | fdisk "$drive" >/dev/null 2>&1 || true
fi
fi
fi
# Add crypttab entry
# Use /dev/urandom, since this is not a long lived key (generated each boot),
# and so that we don't block booting while waiting for entropy
echo "cryptswap$i UUID=$uuid /dev/urandom swap,offset=1024,cipher=aes-xts-plain64" >> /etc/crypttab
# Add fstab entry
echo "/dev/mapper/cryptswap$i none swap sw 0 0" >> /etc/fstab
done
if [ "$NO_RELOAD" != 1 ]; then
# Turn swap off
swapoff -a
# Restart cryptdisks
/etc/init.d/cryptdisks restart
# Turn the swap on
swapon -a
fi
info `gettext "Successfully encrypted swap!"`
|