Llewellyn/Tomb
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#!/bin/zsh
#
# Tomb, the Crypto Undertaker
#
# a tool to easily operate file encryption of private and secret data
#
# Copyleft (C) 2007-2011 Denis Roio <jaromil@dyne.org>
#
# This source code is free software; you can redistribute it and/or
# modify it under the terms of the GNU Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This source code 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.
# Please refer to the GNU Public License for more details.
#
# You should have received a copy of the GNU Public License along with
# this source code; if not, write to:
# Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
VERSION=1.1
DATE=May/2011
TOMBEXEC=$0
TOMBOPENEXEC="tomb-open"
typeset -a OLDARGS
for arg in ${argv}; do OLDARGS+=($arg); done
STEGHIDE=1
MOUNTOPTS="rw,noatime,nodev"
#declare global variables
QUIET=0
DEBUG=0
typeset -A global_opts
typeset -A opts
# PATH=/usr/bin:/usr/sbin:/bin:/sbin
autoload colors; colors
# standard output message routines
# it's always useful to wrap them, in case we change behaviour later
notice() { if [[ $QUIET == 0 ]]; then print "$fg_bold[green][*]$fg_no_bold[white] $1" >&2; fi }
error() { if [[ $QUIET == 0 ]]; then print "$fg[red][!]$fg[white] $1" >&2; fi }
func() { if [[ $DEBUG == 1 ]]; then print "$fg[blue][D]$fg[white] $1" >&2; fi }
act() {
if [[ $QUIET == 0 ]]; then
if [ "$1" = "-n" ]; then
print -n "$fg_bold[white] . $fg_no_bold[white] $2" >&2;
else
print "$fg_bold[white] . $fg_no_bold[white] $1" >&2;
fi
fi
}
check_bin() {
# which dd command to use
which dcfldd > /dev/null
if [ $? = 0 ]; then
DD="dcfldd"
else
DD=dd
fi
# which wipe command to use
which wipe > /dev/null
if [ $? = 0 ]; then
WIPE=(wipe -f -s)
else
WIPE=(rm -f)
fi
# check for filesystem creation progs
which mkfs.ext4 > /dev/null
if [ $? = 0 ]; then
MKFS=(mkfs.ext4 -q -F -j -L)
else
MKFS=(mkfs.ext3 -q -F -j -L)
fi
# check for sudo
which sudo > /dev/null
if [ $? != 0 ]; then
error "Cannot find sudo. Please install it"
exit 1
fi
# check for steghide
which steghide > /dev/null
if [ $? != 0 ]; then
STEGHIDE=0
fi
which cryptsetup > /dev/null
if [ $? != 0 ]; then
error "Cannot find cryptsetup. Please install it."
exit 1
fi
which pinentry > /dev/null
if [ $? != 0 ]; then
error "Cannot find pinentry. Please install it."
exit 1
fi
# check for tomb-open script
if [ "$0" = "./tomb" ]; then
TOMBOPENEXEC="./tomb-open"
elif [ "$0" != "tomb" ]; then
TOMBOPENEXEC="`dirname $0`/tomb-open"
fi
}
# safe dir creation function
safe_dir() {
which mktemp &> /dev/null
if [[ $? = 0 ]]; then
mktemp -d /dev/shm/$1.$$.XXXXXXX
return
fi
dir="/dev/shm/$1.$$.$RANDOM.$RANDOM"
(umask 077 && mkdir "$dir") || print "-1"
print "$dir"
}
#check if there is swap activated
check_swap() {
# Return 0 if NO swap is used, 1 if swap is used
# TODO: it should return 2 if swap is used, but encrypted
nlines=$(wc -l /proc/swaps|cut -f1 -d ' ')
if [[ $nlines -gt 1 ]]; then
r=1
else
#and return 2
r=0
fi
if [[ $1 == out ]]; then
echo $r;
fi
return $r;
}
# we use pinentry now
# comes from gpg project and is much more secure
# it also conveniently uses the right toolkit
ask_password() {
# pinentry has no custom icon setting
# so we need to temporary modify the gtk theme
if [ -r /usr/local/share/themes/tomb/gtk-2.0-key/gtkrc ]; then
GTK2_RC=/usr/local/share/themes/tomb/gtk-2.0-key/gtkrc
elif [ -r /usr/share/themes/tomb/gtk-2.0-key/gtkrc ]; then
GTK2_RC=/usr/share/themes/tomb/gtk-2.0-key/gtkrc
fi
cat <<EOF | GTK2_RC_FILES=${GTK2_RC} pinentry 2>/dev/null | awk '/^D / { sub(/^D /, ""); print }'
OPTION ttyname=$TTY
OPTION lc-ctype=$LANG
SETTITLE Insert tomb password
SETDESC Open tomb: $1
SETPROMPT Password:
GETPIN
EOF
}
# drop privileges
exec_as_user() {
if ! [ $SUDO_USER ]; then
exec $@[@]
return $?
fi
func "exec_as_user '$SUDO_USER': ${(f)@}"
sudo -u $SUDO_USER "${@[@]}"
return $?
}
# escalate privileges
check_priv() {
if [ $UID != 0 ]; then
func "Using sudo for root execution of 'tomb ${(f)OLDARGS}'"
# check if sudo has a timestamp active
sudok=false
sudo -n ${TOMBEXEC} &> /dev/null
if [ $? != 0 ]; then # if not then ask a password
cat <<EOF | pinentry 2>/dev/null | awk '/^D / { sub(/^D /, ""); print }' | sudo -S -v
OPTION ttyname=$TTY
OPTION lc-ctype=$LANG
SETTITLE Super user privileges required
SETDESC Sudo execution of Tomb ${OLDARGS[@]}
SETPROMPT Insert your USER password:
GETPIN
EOF
fi
sudo "${TOMBEXEC}" "${(@)OLDARGS}"
exit $?
fi # are we root already
return 0
}
get_arg_tomb() {
# set up variables to be used by caller:
# tombfile - filename without path
# tombdir - directory where the tomb is
# tombname - name of the tomb (filename without extension)
# the full path is made with $tombdir/$tombfile
if [ -z $1 ]; then
error "internal: get_arg_tomb called without argument"
return 1
fi
arg=${1}
if ! [ -r ${arg} ]; then
error "file not found: $arg"
return 1
fi
tombfile=`basename $arg`
tombdir=`dirname $arg`
file ${tombdir}/${tombfile} | grep -i 'luks encrypted file' 2>&1 >/dev/null
if [ $? != 0 ]; then
error "$arg is not a valid tomb file, operation aborted"
return 1
fi
tombname=${tombfile%%\.*}
func "tomb found: ${tombdir}/${tombfile}"
# now check if the key is kept beside or in args
# we use the extension .key
# the problem with .tomb.gpg is that decoding by hand using gpg it
# can override the tomb contents if the key is in the same
# directory than the tomb
if [ $KEY ]; then
tombkey=$KEY # commandline -k flag
act "tomb key specified manually: $tombkey"
elif [ -r ${tombdir}/${tombname}.tomb.key ]; then
tombkey=${tombdir}/${tombname}.tomb.key
act "key found for tomb '${tombname}': ${tombkey}"
else
error "key not found for tomb '${tombname}'"
return 1
fi
return 0
}
usage() {
cat <<EOF
Tomb $VERSION - a strong and gentle undertaker for your secrets
Copyright (C) 2007-2011 Dyne.org Foundation, License GNU GPL v3+
This is free software: you are free to change and redistribute it
The latest Tomb sourcecode is published on <http://tomb.dyne.org>
Syntax: tomb [options] command [file] [place]
Commands:
create create a new tomb FILE and its keys
open open an existing tomb FILE on PLACE
list list all open tombs or the one called FILE
close close the open tomb called FILE (or all)
slam close tomb FILE and kill all pids using it
EOF
if [ "$STEGHIDE" = 1 ]; then
cat <<EOF
bury hide a tomb key FILE inside a jpeg PLACE
exhume extract a tomb key FILE from a jpeg PL
EOF
fi
cat <<EOF
Options:
-s size of the tomb file when creating one (in MB)
-k path to the key to use for opening a tomb
-n don't process the hooks found in tomb
-o mount options used to open (default: rw,noatime,nodev)
-h print this help
-v version information for this tool
-q run quietly without printing informations
-D print debugging information at runtime
For more informations on Tomb read the manual: man tomb
Please report bugs on <http://bugs.dyne.org>.
EOF
}
generate_translatable_strings() {
cat <<EOF
# Tomb - The Crypto Undertaker.
# Copyright (C) 2007-2011 Dyne.org Foundation
# Denis Roio <jaromil@dyne.org>, 2011.
#
#, fuzzy
msgid ""
msgstr ""
"Project-Id-Version: Tomb $VERSION\n"
"PO-Revision-Date: `date`\n"
"Last-Translator: Denis Roio <jaromil@dyne.org>\n"
"Language-Team: Tomb developers <crypto@lists.dyne.org>\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=CHARSET\n"
"Content-Transfer-Encoding: 8bit\n"
#
#: commandline help
#
msgid ""
EOF
usage | awk '
{ print "\"" $0 "\"" }'
cat <<EOF
msgstr ""
#
# tomb internal messages
#
EOF
cat $TOMBEXEC | awk '
/notice ".*"$/ { sub( /notice/ , "");
print "#: notice"; print "msgid " $0; print "msgstr \"\"\n" }
/act ".*"$/ { sub( /act/ , "");
print "#: act"; print "msgid " $0; print "msgstr \"\"\n" }
'
}
create_tomb() {
if ! option_is_set --ignore-swap && [[ `check_swap out` == 1 ]]; then
error "You have swap activated; use --ignore-swap if you want to skip this check"
act "Using encryption with swap activated is very bad, because some files, or even your secret key, could be written on hard disk."
act "However, it could be that your swap is encrypted. If this is case, this is ok. Then, use --ignore-swap to skip this check"
exit 1
fi
if ! [ ${CMD2} ]; then
error "no tomb name specified for creation"
return 1
fi
tombfile=`basename ${CMD2}`
tombdir=`dirname ${CMD2}`
# make sure the file has a .tomb extension
tombname=${tombfile%%\.*}
tombfile=${tombname}.tomb
tombsize=$opts[-s]
if [[ $tombsize != <-> ]]; then
error "Size is not an integer"
return 1
fi
if [ -e ${tombdir}/${tombfile} ]; then
error "tomb exists already. I'm not digging here:"
ls -lh ${tombdir}/${tombfile}
return 1
fi
if option_is_set -k; then
tombkey="`option_value -k`.tomb.key"
else
tombkey="${tombdir}/${tombfile}.key"
fi
if [ -e "${tombkey}" ]; then
error "tomb key already exists. Quitting."
ls -lh ${tombkey}
return 1
fi
notice "Creating a new tomb in ${tombdir}/${tombfile}"
if [ -z $tombsize ]; then
act "No size specified, summoning the Tomb Undertaker to guide us in the creation."
"$TOMBOPENEXEC" &
wait $!
return 0
fi
tombsize_4k=`expr $tombsize \* 1024 / 4`
act "Generating ${tombfile} of ${tombsize}Mb (${tombsize_4k} blocks of 4Kb)"
$DD if=/dev/urandom bs=4k count=${tombsize_4k} of=${tombdir}/${tombfile}
if [ $? = 0 -a -e ${tombdir}/${tombfile} ]; then
act "OK: `ls -lh ${tombdir}/${tombfile}`"
else
error "Error creating the tomb ${tombdir}/${tombfile}, operation aborted."
exit 1
fi
nstloop=`losetup -f` # get the number for next loopback device
losetup -f ${tombdir}/${tombfile} # allocates the next loopback for our file
# create the keyfile in tmpfs so that we leave less traces in RAM
keytmp=`safe_dir tomb`
if [ "$keytmp" = "-1" ]; then
error "error creating temp dir"
exit 1
fi
#rm -f $keytmp
# ?????? creo, cancello e ricreo ??????
#mkdir -p $keytmp
mount tmpfs "${keytmp}" -t tmpfs -o size=1m
if [ $? != 0 ]; then
error "cannot mount tmpfs filesystem in volatile memory"
error "operation aborted."
losetup -d $nstloop
rm -r "${keytmp}"
exit 1
fi
act "Generating secret key..."
act "this operation takes time, keep using this computer on other tasks,"
act "once done you will be asked to choose a password for your tomb."
act "To make it faster you can move the mouse around"
touch ${keytmp}/tomb.tmp
chmod 0600 ${keytmp}/tomb.tmp
if [[ $DD = "dcfldd" ]]; then
$DD bs=1 count=256 if=/dev/random of=${keytmp}/tomb.tmp statusinterval=1
else
$DD bs=1 count=256 if=/dev/random of=${keytmp}/tomb.tmp
fi
if ! [ -r ${keytmp}/tomb.tmp ]; then
error "cannot generate encryption key, operation aborted."
umount ${keytmp}
losetup -d $nstloop
rm -r $keytmp
exit 1
fi
notice "Setup your secret key file ${tombkey}"
# here user is prompted for key password
for c in 1 2 3; do
# 3 tries to write two times a matching password
tombpass=`exec_as_user ${TOMBEXEC} askpass ${tombname}`
tombpasstmp=$tombpass
tombpass=`exec_as_user ${TOMBEXEC} askpass "${tombname} (again)"`
if [ "$tombpasstmp" = "$tombpass" ]; then
break;
fi
unset tombpasstmp
unset tombpass
done
if [ -z $tombpass ]; then
error "passwords don't match, aborting operation"
umount ${keytmp}
losetup -d $nstloop
rm -r $keytmp
exit 1
fi
gpg \
--openpgp --batch --no-options --no-tty --passphrase-fd 0 2>/dev/null \
-o "${tombkey}" -c -a ${keytmp}/tomb.tmp <<< ${tombpass}
# if [ $? != 0 ]; then
# error "setting password failed: gnupg returns 2"
# umount ${keytmp}
# losetup -d $nstloop
# rm -r $keytmp
# exit 1
# fi
act "formatting Luks mapped device"
# we use aes-cbc-essiv with sha256
# for security, performance and compatibility
cryptsetup --batch-mode \
--cipher aes-cbc-essiv:sha256 --key-size 256 \
luksFormat ${nstloop} ${keytmp}/tomb.tmp
if ! [ $? = 0 ]; then
act "operation aborted."
exit 0
fi
cryptsetup --key-file ${keytmp}/tomb.tmp --cipher aes luksOpen ${nstloop} tomb.tmp
${WIPE[@]} ${keytmp}/tomb.tmp
umount ${keytmp}
rm -r ${keytmp}
# cryptsetup luksDump ${nstloop}
act "formatting your Tomb with Ext3/Ext4 filesystem"
${MKFS} ${tombname} /dev/mapper/tomb.tmp
if [ $? != 0 ]; then
error "Tomb format returns error"
error "your tomb ${tombfile} maybe corrupt"
fi
sync
cryptsetup luksClose tomb.tmp
losetup -d ${nstloop}
# set permissions on the tomb
ME=${SUDO_USER:-$(whoami)}
chmod 0600 "${tombdir}/${tombfile}"
chown $(id -u $ME):$(id -g $ME) "${tombdir}/${tombfile}"
act "done creating $tombname encrypted storage (using Luks dm-crypt AES/SHA256)"
notice "Your tomb is ready in ${tombdir}/${tombfile} and secured with key ${tombkey}"
}
mount_tomb() {
notice "Commanded to open tomb $CMD2"
if ! option_is_set --ignore-swap && [[ `check_swap out` == 1 ]]; then
error "You have swap activated; use --ignore-swap if you want to skip this check"
act "Using encryption with swap activated is very bad, because some files, or even your secret key, could be written on hard disk."
act "However, it could be that your swap is encrypted. If this is case, this is ok. Then, use --ignore-swap to skip this check"
exit 1
fi
if ! [ ${CMD2} ]; then
error "no tomb name specified for creation"
return 1
fi
# TODO: eliminate this function
get_arg_tomb $CMD2
local tombkey
if option_is_set -k ; then
if [[ "`option_value -k`" == "-" ]]; then
# take key from stdin
local tombkeydir
tombkeydir=`safe_dir`
cat > ${tombkeydir}/stdin.tmp
tombkey=${tombkeydir}/stdin.tmp
else
# take key from a file
tombkey=`option_value -k`
fi
else
# guess key as lying besides the tomb
tombkey="${PARAM[1]}.key"
fi
echo the key used is $tombkey
if [ $? != 0 ]; then
error "operation aborted."
return 1
fi
if ! [ $CMD3 ]; then
tombmount=/media/${tombfile}
act "mountpoint not specified, using default: $tombmount"
elif ! [ -x $CMD3 ]; then
error "mountpoint $CMD3 doesn't exist, operation aborted."
if [ -n "$usbkey_mount" ]; then
umount $usbkey_mount
rmdir $usbkey_mount
unset usbkey_mount
fi
return 1
else
tombmount=$CMD3
fi
# check if its already open
mount -l | grep "${tombname}.tomb.*\[$tombname\]$" 2>&1 > /dev/null
if [ $? = 0 ]; then
error "$tombname is already mounted on $tombmount"
act "tomb list - show all tombs currently open"
if [ -n "$usbkey_mount" ]; then
umount $usbkey_mount
rmdir $usbkey_mount
unset usbkey_mount
fi
error "operation aborted."
return 1
fi
notice "mounting $tombfile on mountpoint $tombmount"
# we need root from here on
mkdir -p $tombmount
nstloop=`losetup -f`
if [ $? = 255 ]; then
error "too many tomb opened. Please close any of them to open another tomb"
exit 1
fi
losetup -f ${tombdir}/${tombfile}
act "check for a valid LUKS encrypted device"
cryptsetup isLuks ${nstloop}
if [ $? != 0 ]; then
# is it a LUKS encrypted nest? see cryptsetup(1)
error "$tombfile is not a valid Luks encrypted storage file"
$norm || rmdir $tombmount 2>/dev/null
return 1
fi
# save date of mount in minutes since 1970
mapdate=`date +%s`
mapper="tomb.${tombname}.${mapdate}.`basename $nstloop`"
keyname=`basename $tombkey | cut -d. -f1`
notice "Password is required for key ${keyname}"
for c in 1 2 3; do
if [ $c = 1 ]; then
tombpass=`exec_as_user ${TOMBEXEC} askpass ${keyname}`
else
tombpass=`exec_as_user ${TOMBEXEC} askpass "$keyname (retry $c)"`
fi
(gpg --batch --passphrase-fd 0 --no-tty --no-options \
-d "${tombkey}" 2> /dev/null <<< ${tombpass} ) \
| cryptsetup --key-file - luksOpen ${nstloop} ${mapper}
unset tombpass
# if key was from stdin delete temp file and dir
if [ $tombkeydir ]; then
${WIPE[@]} ${tombkey}
rmdir $tombkeydir
fi
if [ -r /dev/mapper/${mapper} ]; then
break; # password was correct
fi
done
if ! [ -r /dev/mapper/${mapper} ]; then
error "failure mounting the encrypted file"
losetup -d ${nstloop}
$norm || rmdir ${tombmount} 2>/dev/null
return 1
fi
act "encrypted storage filesystem check"
fsck -p -C0 /dev/mapper/${mapper}
act "tomb engraved as $tombname"
tune2fs -L ${tombname} /dev/mapper/${mapper} > /dev/null
mount -o $MOUNTOPTS /dev/mapper/${mapper} ${tombmount}
# Ensure the user can write the disk - 10x Hellekin :)
ME=${SUDO_USER:-$(whoami)}
chmod 0750 ${tombmount}
chown $(id -u $ME):$(id -g $ME) ${tombmount}
notice "encrypted storage $tombfile succesfully mounted on $tombmount"
if ! [ $NOBIND ]; then
exec_safe_bind_hooks ${tombmount}
exec_safe_post_hooks ${tombmount} open
fi
return 0
}
encode_key() {
tombkey=$CMD2
imagefile=$CMD3
file $tombkey | grep PGP > /dev/null
if [ $? != 0 ]; then
error "encode failed: $tombkey is not a tomb key"
return 1
fi
file $imagefile | grep JPEG > /dev/null
if [ $? != 0 ]; then
error "encode failed: $imagefile is not a jpeg image"
return 1
fi
notice "Encoding key $tombkey inside image $imagefile"
act "please choose a password for the encoding"
# here user is prompted for key password
for c in 1 2 3; do
# 3 tries to write two times a matching password
tombpass=`exec_as_user ${TOMBEXEC} askpass ${tombkey}`
tombpasstmp=$tombpass
tombpass=`exec_as_user ${TOMBEXEC} askpass "${tombkey} (again)"`
if [ "$tombpasstmp" = "$tombpass" ]; then
break;
fi
unset tombpasstmp
unset tombpass
done
if [ -z $tombpass ]; then
error "passwords don't match, aborting operation."
return 1
fi
awk '
/^-----/ {next}
/^Version/ {next}
{print $0}' ${tombkey} \
| steghide embed --embedfile - --coverfile ${imagefile} \
-p ${tombpass} -z 9 -e serpent cbc
if [ $? != 0 ]; then
error "encoding error: steghide reports problems"
res=1
else
notice "tomb key encoded succesfully into image ${imagefile}"
res=0
fi
unset tombpass
return $res
}
decode_key() {
tombname=$CMD2
imagefile=$CMD3
res=1
file $imagefile | grep JPEG > /dev/null
if [ $? != 0 ]; then
error "encode failed: $imagefile is not a jpeg image"
return 1
fi
keyfile=${tombname%%\.*}.tomb.key
notice "Trying to exhume a key out of image $imagefile"
for c in 1 2 3; do
if [ $c = 1 ]; then
tombpass=`exec_as_user ${TOMBEXEC} askpass ${keyfile}`
else
tombpass=`exec_as_user ${TOMBEXEC} askpass "$keyfile (retry $c)"`
fi
steghide extract -sf ${imagefile} -p ${tombpass} -xf - \
| awk '
BEGIN {
print "-----BEGIN PGP MESSAGE-----"
}
{ print $0 }
END {
print "-----END PGP MESSAGE-----"
}' > ${keyfile}
if [ "`cat ${keyfile} | wc -l`" != "3" ]; then
act "${keyfile} succesfully decoded"
res=0
break;
fi
done
unset tombpass
if [ $res != 0 ]; then
error "nothing found."
fi
return $res
}
exec_safe_bind_hooks() {
if [[ -n ${(k)opts[-o]} ]]; then
MOUNTOPTS=${opts[-o]}
fi
local MOUNTPOINT="${1}"
local ME=${SUDO_USER:-$(whoami)}
local HOME=$(grep $ME /etc/passwd | sed "s/^${ME}:.*:.*:.*:.*:\([\/a-z]*\):.*$/\1/" 2>/dev/null)
if [ $? -ne 0 ]; then
error "how pitiful! A tomb, and no HOME"
return 1
fi
if [ -z "$MOUNTPOINT" -o ! -d "$MOUNTPOINT" ]; then
error "cannot exec bind hooks without a mounted tomb."
return 1
fi
if ! [ -r "$MOUNTPOINT/bind-hooks" ]; then
func "bind-hooks not found in $MOUNTPOINT"
return 1
fi
typeset -al mounted
typeset -Al maps
maps=($(<"$MOUNTPOINT/bind-hooks"))
for dir in ${(k)maps}; do
if [ "${dir[1]}" = "/" -o "${dir[1,2]}" = ".." ]; then
error "bind-hooks map format: local/to/tomb local/to/\$HOME"
continue
fi
if [ "${${maps[$dir]}[1]}" = "/" -o "${${maps[$dir]}[1,2]}" = ".." ]; then
error "bind-hooks map format: local/to/tomb local/to/\$HOME. Rolling back"
for dir in ${mounted}; do umount $dir; done
return 1
fi
if [ ! -r "$HOME/${maps[$dir]}" ]; then
error "bind-hook target not existent, skipping $HOME/${maps[$dir]}"
elif [ ! -r "$MOUNTPOINT/$dir" ]; then
error "bind-hook source not found in tomb, skipping ${MOUNTPOINT}/${dir}"
else
mount -o bind,$MOUNTOPTS $MOUNTPOINT/$dir $HOME/${maps[$dir]}
mounted+=("$HOME/${maps[$dir]}")
fi
done
}
exec_safe_post_hooks() {
local mnt=$1 # first argument is where the tomb is mounted
local ME=${SUDO_USER:-$(whoami)}
if ! [ -x ${mnt}/post-hooks ]; then return; fi
# if 'post-hooks' is found inside the tomb, check it: if it is an
# executable, launch it as a user this might need a dialog for
# security on what is being run, however we expect you know well
# what is inside your tomb. this feature opens the possibility to
# make encrypted executables.
cat ${mnt}/post-hooks | head -n1 | grep '^#!/'
if [ $? = 0 ]; then
act "post hooks found, executing as user $SUDO_USER"
exec_as_user ${mnt}/post-hooks $2
fi
}
kill_tomb() {
# $1 = pids to kill
# $2 = type of kill
local e p
# substitute the \n with space
e=${1//$'\n'/ }
# split the string at space delim
# so we can get a for loop honestly
e=(${(s: :)e})
for p in $e; do
func "killing PID $p..."
if [[ "$2" == "soft" ]]; then
kill -USR1 $p
elif [[ "$2" == "hard" ]]; then
kill -TERM $p
elif [[ "$2" == "must die" ]]; then
kill -KILL $p
fi
done
}
slam_tomb() {
# $1 = tomb mount point
local pidk
pidk=`lsof -t "$1"`
if [[ ! -z "$pidk" ]]; then
kill_tomb "$pidk" "soft"
else
return 0
fi
# if there are remaining pids
# we need to play hard
pidk=`lsof -t "$1"`
if [[ -z "$pidk" ]]; then
return 0
fi
# if we set the -f (force) option
# don't wait, just kill
option_is_set -f || sleep 3
kill_tomb "$pidk" "hard"
pidk=`lsof -t "$1"`
if [[ -z "$pidk" ]]; then
return 0
fi
# if there are still some pids around
# we have to kill 'em all
option_is_set -f || sleep 3
kill_tomb "$pidk" "must die"
pidk=`lsof -t "$1"`
if [[ -z "$pidk" ]]; then
return 0
fi
# what PITA!
return 1
}
umount_tomb() {
local tombs how_many_tombs
local pathmap mapper tombname tombmount loopdev
local ans pidk pname
if ! [ $1 ]; then
tombs=`find /dev/mapper -name 'tomb.*'`
how_many_tombs=`wc -w <<< "$tombs"`
if [[ "$how_many_tombs" == "0" ]]; then
error "There is no open tomb to be closed"
return 1
elif [[ "$how_many_tombs" == "1" ]]; then
#mapper=`find /dev/mapper -name 'tomb.*'`
func "closing mapper $tombs"
umount_tomb ${tombs}
return 1
else
error "Too many tombs mounted, please specify which to unmount:"
ls /dev/mapper/tomb.*
error "or issue the command 'tomb close all' to clos'em all."
return 1
fi
fi
if [ "$1" = "all" ]; then
tombs=`find /dev/mapper -name 'tomb.*'`
if ! [ $tombs ]; then
notice "Tombs are all closed, cemetery is quiet."
return 0
fi
for t in ${(f)tombs}; do
umount_tomb ${t}
done
return 0
fi
# tomb close argument deduction
pathmap=`dirname "$1"`
if [ "${pathmap}" = "/dev/mapper" ]; then
mapper="$1" # argument is the mapper (or none which autofills mapper)
tombname="`print $mapper | cut -d. -f2`"
tombmount=`mount -l | \
awk -vtomb="[$tombname]" '/^\/dev\/mapper\/tomb/ { if($7==tomb) print $3 } '`
elif [ "$pathmap" = "." ]; then
tombname="$1" # argument is the name
mapper=`mount -l | \
awk -vtomb="[$tombname]" '/^\/dev\/mapper\/tomb/ { if($7==tomb) print $1 } '`
tombmount=`mount -l | \
awk -vtomb="[$tombname]" '/^\/dev\/mapper\/tomb/ { if($7==tomb) print $3 } '`
else
tombmount="$1" # argument should be the mount
mapper=`mount | awk -vmnt="$tombmount" '/^\/dev\/mapper\/tomb/ { if($3==mnt) print $1 }'`
tombname="`print $mapper | cut -d. -f2`"
fi
# avoid block when the same tomb is mounted, take only the first
for tm in ${(f)tombmount}; do tombmount=${tm}; break; done
func "tomb close argument: $1"
func "name:\t$tombname"
func "mount:\t$tombmount"
func "mapper:\t$mapper"
if ! [ -e "$mapper" ]; then
error "Tomb not found: $1"
error "Please specify an existing tomb."
return 0
fi
if [ $SLAM ]; then
notice "Slamming tomb $tombname mounted on $tombmount"
act "Kill all processes busy inside the tomb"
slam_tomb "$tombmount"
if [[ $? == 1 ]]; then
error "Cannot slam the tomb $tombname"
return 1
fi
else
notice "Closing tomb $tombname mounted on $tombmount"
fi
# check if there are binded dirs and close them
tombmount_esc=`sed 's:\/:\\\/:g' <<< $tombmount `
unbind=`mount | awk "/^$tombmount_esc.*bind/"' { print $3 }'`
for b in ${(f)unbind}; do
hook="`basename $b`"
act "closing tomb hook: $hook"
umount $b
if [[ $? != 0 ]]; then
if [ $SLAM ]; then
notice "Slamming tomb: killing all processes using this hook"
slam_tomb "$b"
if [[ $? == 1 ]]; then
error "Cannot slam the tomb $b"
return 1
fi
umount $b
else
error "Tomb hook is busy, cannot close tomb."
return 1
fi
fi
done
# Execute post-hooks for eventual cleanup
if ! [ $NOBIND ]; then
exec_safe_post_hooks ${tombmount%%/} close
fi
if [ $tombmount ]; then # tomb is actively mounted
func "performing umount of $tombmount"
umount ${tombmount}
if ! [ $? = 0 ]; then
error "Tomb is busy, cannot umount!"
else
rmdir ${tombmount}
fi
fi
cryptsetup luksClose $mapper
if ! [ $? = 0 ]; then
error "error occurred in cryptsetup luksClose ${mapper}"
return 1
fi
loopdev=`cut -d '.' -f4 <<< "$mapper"`
losetup -d "/dev/$loopdev"
# kill the status tray widget if still present
# this makes the widget disappear when closing tomb from cli
awkmapper=`sed 's:\/:\\\/:g' <<< $mapper`
statustray_pid=`ps ax | awk "/tomb-status $awkmapper/"' {print $1} '`
if [ ${statustray_pid} ]; then
kill ${statustray_pid}
fi
notice "Tomb $tombname closed: your bones will rest in peace."
return 0
}
# list all tombs mounted in a readable format
list_tombs() {
if [ $1 ]; then
# list a specific tomb
mounted_tombs=`mount -l |
awk -vtomb="[$1]" '/^\/dev\/mapper\/tomb/ { if($7==tomb) print $1 ";" $3 ";" $5 ";" $6 ";" $7 }'`
else
# list all open tombs
mounted_tombs=`mount -l |
awk '/^\/dev\/mapper\/tomb/ { print $1 ";" $3 ";" $5 ";" $6 ";" $7 }'`
fi
# 1 = full mapper path
# 2 = mountpont
# 3 = filesystem
# 4 = mount options
# 5 = name
if ! [ $mounted_tombs ]; then
if [ $1 ]; then
error "There seems to be no open tomb engraved as [${1}]"
else
error "I can't see any open tomb, may they all rest in peace."
fi
exit 1
fi
for t in ${(f)mounted_tombs}; do
mapper=`basename ${t[(ws:;:)1]}`
tombname=${t[(ws:;:)5]}
tombmount=${t[(ws:;:)2]}
tombfs=${t[(ws:;:)3]}
tombfsopts=${t[(ws:;:)4]}
# calculate tomb size
ts=`df -hP /dev/mapper/$mapper |
awk "/mapper/"' { print $2 ";" $3 ";" $4 ";" $5 }'`
tombtot=${ts[(ws:;:)1]}
tombused=${ts[(ws:;:)2]}
tombavail=${ts[(ws:;:)3]}
tombpercent=${ts[(ws:;:)4]}
tombp=${tombpercent%%%}
tombsince=`date --date=@${mapper[(ws:.:)3]} +%c`
# breaking up such strings is good for translation
print -n "$fg[green]$tombname"
print -n "$fg[white] open on "
print -n "$fg_bold[white]$tombmount"
print -n "$fg_no_bold[white] using "
print "$fg_bold[white]$tombfs $tombfsopts"
print -n "$fg_no_bold[green]$tombname"
print -n "$fg[white] size "
print -n "$fg_bold[white]$tombtot"
print -n "$fg_no_bold[white] of which "
print -n "$fg_bold[white]$tombused"
print -n "$fg_no_bold[white] used "
print -n "$fg_bold[white]$tombavail"
print -n "$fg_no_bold[white] free ("
print -n "$fg_bold[white]$tombpercent"
print "$fg_no_bold[white] full)"
if [[ ${tombp} -ge 90 ]]; then
error "Your tomb is almost full!"
fi
print -n "$fg_no_bold[green]$tombname"
print -n "$fg_no_bold[white] open since "
print "$fg_bold[white]$tombsince$fg_no_bold[white]"
# now check hooks
mtomb=`sed 's:\/:\\\/:g' <<< $tombmount`
mounted_hooks=`mount | awk "/^$mtomb/"' {print $1 ";" $3}'`
for h in ${(f)mounted_hooks}; do
print -n "$fg[green]$tombname"
print -n "$fg_no_bold[white] hooks "
print -n "$fg_bold[white]`basename ${h[(ws:;:)1]}`"
print -n "$fg_no_bold[white] on "
print "$fg_bold[white]${h[(ws:;:)2]}$fg_no_bold[white]"
done
done
}
launch_status() {
# calculates the correct arguments to launch tomb-status tray
# applet; it takes the tomb name as an argument and can be
# launched after a successful tomb mount.
which tomb-status > /dev/null
if [ $? != 0 ]; then
error "Cannot find tomb-status binary, operation aborted."
return 1
fi
if ! [ $DISPLAY ]; then
error "No active X display found, operation aborted."
error "Status launches a graphical tray applet, you need X running."
return 1
fi
# check argument. use single tomb mounted if no argument
# abort if more than one tomb is mounted.
if ! [ $1 ]; then
tombs=`find /dev/mapper -name 'tomb.*'`
how_many_tombs=`wc -w <<< "$tombs"`
if [[ "$how_many_tombs" == "0" ]]; then
error "There is no open tomb, status cannot be launched"
return 1
elif [[ "$how_many_tombs" == "1" ]]; then
#mapper=`find /dev/mapper -name 'tomb.*'`
tombname=`find /dev/mapper -name "tomb.*"`
tombname=`basename $tombname | cut -d. -f2`
notice "launching status for tomb $tombname"
else
error "Too many tombs mounted, please specify which one"
list_tombs
return 0
fi
else
# name was specified on command line
tombname=$1
ls /dev/mapper | grep "^tomb.${tombname}.*" > /dev/null
if [ $? != 0 ]; then
error "Cannot find any tomb named $tombname being open, operation aborted."
return 1
fi
fi
# finally we launch
tombmap=`mount -l | awk "/\[${tombname}\]$/"' { print $1 } '`
tombmount=`mount -l | awk "/\[${tombname}\]$/"' { print $3 } '`
tomb-status $tombmap $tombname $tombmount &!
return 0
}
# install mime-types, bells and whistles for the desktop
# see http://developers.sun.com/solaris/articles/integrating_gnome.html
# and freedesktop specs
install_tomb() {
# TODO: distro package deps (for binary)
# debian: zsh, cryptsetup, sudo
act "updating mimetypes..."
cat <<EOF > /tmp/dyne-tomb.xml
<?xml version="1.0"?>
<mime-info xmlns='http://www.freedesktop.org/standards/shared-mime-info'>
<mime-type type="application/x-tomb-volume">
<comment>Tomb encrypted volume</comment>
<glob pattern="*.tomb"/>
</mime-type>
<mime-type type="application/x-tomb-key">
<comment>Tomb crypto key</comment>
<glob pattern="*.tomb.key"/>
</mime-type>
</mime-info>
EOF
xdg-mime install /tmp/dyne-tomb.xml
xdg-icon-resource install --context mimetypes --size 32 monmort.xpm monmort
xdg-icon-resource install --size 32 monmort.xpm dyne-monmort
rm /tmp/dyne-tomb.xml
act "updating desktop..."
cat <<EOF > /usr/share/applications/tomb.desktop
[Desktop Entry]
Version=1.0
Type=Application
Name=Tomb crypto undertaker
GenericName=Crypto undertaker
Comment=Keep your bones safe
Exec="${TOMBOPENEXEC}" %U
TryExec=tomb-open
Icon=monmort.xpm
Terminal=true
Categories=Utility;Security;Archiving;Filesystem;
MimeType=application/x-tomb-volume;
X-AppInstall-Package=tomb
EOF
update-desktop-database
act "updating menus..."
cat <<EOF > /etc/menu/tomb
?package(tomb):command="tomb" icon="/usr/share/pixmaps/monmort.xpm" needs="text" \
section="Applications/Accessories" title="Tomb" hints="Crypto" \
hotkey="Tomb"
EOF
update-menus
act "updating mime info..."
cat <<EOF > /usr/share/mime-info/tomb.keys
# actions for encrypted tomb storage
application/x-tomb-volume:
open="${TOMBOPENEXEC}" %f
view=tomb-open %f
icon-filename=monmort.xpm
short_list_application_ids_for_novice_user_level=tomb
EOF
cat <<EOF > /usr/share/mime-info/tomb.mime
# mime type for encrypted tomb storage
application/x-tomb-volume
ext: tomb
application/x-tomb-key
ext: tomb.key
EOF
cat <<EOF > /usr/lib/mime/packages/tomb
application/x-tomb-volume; tomb-open '%s'; priority=8
EOF
update-mime
act "updating application entry..."
cat <<EOF > /usr/share/application-registry/tomb.applications
tomb
command=tomb-open
name=Tomb - Crypto Undertaker
can_open_multiple_files=false
expects_uris=false
requires_terminal=true
mime-types=application/x-tomb-volume,application/x-tomb-key
EOF
act "Tomb is now installed."
}
option_is_set() {
#First argument, the option (something like "-s")
#Second (optional) argument: if it's "out", command will print it out 'set'/'unset'
# This is useful for if conditions
#Return 0 if is set, 1 otherwise
[[ -n ${(k)opts[$1]} ]];
r=$?
if [[ $2 == out ]]; then
if [[ $r == 0 ]]; then
echo 'set'
else
echo 'unset'
fi
fi
return $r;
}
option_value() {
#First argument, the option (something like "-s")
<<< ${opts[$1]}
}
main() {
local -A subcommands_opts
### Options configuration
#Hi, dear developer! Are you trying to add a new subcommand, or to add some options?
#Well, keep in mind that:
# 1. An option CAN'T have differente meanings/behaviour in different subcommands.
# For example, "-s" means "size" and accept an argument. If you are tempted to add
# an option "-s" (that means, for example "silent", and doesn't accept an argument)
# DON'T DO IT!
# There are two reasons for that:
# I. usability; user expect that "-s" is "size
# II. Option parsing WILL EXPLODE if you do this kind of bad things
# (it will say "option defined more than once, and he's right)
main_opts=(q -quiet=q D -debug=D h -help=h v -version=v)
subcommands_opts[__default]=""
subcommands_opts[open]="n -nohook=n k: -key=k o: -mount-options=o -ignore-swap"
subcommands_opts[mount]=${subcommands_opts[open]}
subcommands_opts[create]="s: -size=s -ignore-swap k: -key=k"
subcommands_opts[close]=""
subcommands_opts[help]=""
subcommands_opts[slam]=""
subcommands_opts[list]=""
subcommands_opts[help]=""
subcommands_opts[bury]=""
subcommands_opts[exhume]=""
subcommands_opts[decompose]=""
subcommands_opts[recompose]=""
subcommands_opts[install]=""
subcommands_opts[askpass]=""
subcommands_opts[mktemp]=""
subcommands_opts[source]=""
subcommands_opts[status]=""
### Detect subcommand
local -aU every_opts #every_opts behave like a set; that is, an array with unique elements
for optspec in $subcommands_opts$main_opts; do
for opt in ${=optspec}; do
every_opts+=${opt}
done
done
local -a oldstar
oldstar=($argv)
zparseopts -M -E -D -Adiscardme ${every_opts}
unset discardme
subcommand=$1
if [[ -z $subcommand ]]; then
subcommand="__default"
fi
if [[ -z ${(k)subcommands_opts[$subcommand]} ]]; then #there's no such subcommand
error "Subcommand '$subcommand' doesn't exist"
exit 127
fi
argv=(${oldstar})
unset oldstar
### Parsing global + command-specific options
# zsh magic: ${=string} will split to multiple arguments when spaces occur
set -A cmd_opts ${main_opts} ${=subcommands_opts[$subcommand]}
if [[ -n $cmd_opts ]]; then #if there is no option, we don't need parsing
zparseopts -M -E -D -Aopts ${cmd_opts}
if [[ $? != 0 ]]; then
error "Some error occurred during option processing. See \"tomb help\" for more info"
exit 127
fi
fi
#build PARAM (array of arguments) and check if there are unrecognized options
ok=0
PARAM=()
for arg in $*; do
if [[ $arg == '--' || $arg == '-' ]]; then
ok=1
continue #it shouldnt be appended to PARAM
elif [[ $arg[1] == '-' ]]; then
if [[ $ok == 0 ]]; then
error "unrecognized option $arg"
exit 127
fi
fi
PARAM+=$arg
done
#first parameter actually is the subcommand: delete it and shift
if [[ $subcommand != '__default' ]]; then
PARAM[1]=()
shift
fi
### End parsing command-specific options
### Set global options (useless, but for code retro-compatibility)
for opt in ${(k)global_opts}; do
if [[ $opt == '-q' ]]; then
QUIET=1
elif [[ $opt == '-D' ]]; then
DEBUG=1
fi
done
CMD=$subcommand
CMD2=$PARAM[1]
CMD3=$PARAM[2]
func "Tomb command: $CMD $CMD2 $CMD3"
case "$subcommand" in
create) check_priv ; create_tomb ;;
mount) check_priv ; mount_tomb ;;
open) check_priv ; mount_tomb ;;
umount) check_priv ; umount_tomb ${CMD2} ;;
close) check_priv ; umount_tomb ${CMD2} ;;
slam) check_priv ; SLAM=1; umount_tomb ${CMD2} ;;
list) list_tombs ${CMD2} ;;
status) launch_status ${CMD2} ;;
help) usage ;;
bury) if [ "$STEGHIDE" = 0 ]; then
error "steghide not installed. Cannot bury your key"
return 1
fi
encode_key ${CMD2} ${CMD3} ;;
exhume) if [ "$STEGHIDE" = 0 ]; then
error "steghide not installed. Cannot exhume your key"
return 1
fi
decode_key ${CMD2} ;;
# internal commands useful to developers
'source') return 0 ;;
install) check_priv ; install_tomb ;;
askpass) ask_password $CMD2 ;;
mktemp) safe_dir ${CMD2} ;;
translate) generate_translatable_strings ;;
__default)
if option_is_set -v; then
echo Tomb - $VERSION
else
usage
fi;;
*) error "command \"$CMD\" not recognized"
act "try -h for help"
return 1
;;
esac
return 0
}
check_bin
main $@
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