Tomb/src/tomb

#!/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=1.0
DATE=Feb/2011
TOMBEXEC=$0
TOMBOPENEXEC="tomb-open"
STEGHIDE=1

# PATH=/usr/bin:/usr/sbin:/bin:/sbin

# standard output message routines
# it's always useful to wrap them, in case we change behaviour later
notice() { if ! [ $QUIET ]; then echo "[*] $1" >&2; fi }
act()    { if ! [ $QUIET ]; then echo " .  $1" >&2; fi }
error()  { if ! [ $QUIET ]; then echo "[!] $1" >&2; fi }
func()   { if [ $DEBUG ]; then   echo "[D] $1" >&2; 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

    # 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() {
    dir="/dev/shm/$1.$RANDOM.$RANDOM.$$"
    (umask 077 && mkdir "$dir") || echo "-1"
    echo "$dir"
}

# 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 | awk '/^D/ { print $2 }'
OPTION ttyname=$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)ARGS}'"
	# check if sudo has a timestamp active
	sudok=false
	sudo -n ${TOMBEXEC} 2> /dev/null
	if [ $? != 0 ]; then # if not then ask a password
	    cat <<EOF | pinentry | awk '/^D/ { print $2 }' | sudo -S -v
OPTION ttyname=$TTY
OPTION lc-ctype=$LANG
SETTITLE Super user privileges required
SETDESC Sudo execution of Tomb ${ARGS[@]}
SETPROMPT Insert your USER password:
GETPIN
EOF
	fi
	sudo "${TOMBEXEC}" ${(s: :)ARGS}
	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%%\.*}
    act "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
 close      close the open tomb called FILE (or all)
 slam       close tomb FILE and kill all pids using it
 bury       hide a tomb key FILE inside a jpeg PLACE
 exhume     extract a tomb key FILE from a jpeg PLACE

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

 -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
}

create_tomb() {
    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

    if [ -e ${tombdir}/${tombfile} ]; then
	error "tomb exists already. I'm not digging here:"
	ls -lh ${tombdir}/${tombfile}
	return 1
    fi

    notice "Creating a new tomb in ${tombdir}/${tombfile}"

    if [ -z $SIZE ]; then
	if [ $CMD3 ]; then
	    tombsize=${CMD3}
	else
	    act "No size specified, summoning the Tomb Undertaker to guide us in the creation."
	    "$TOMBOPENEXEC" &
	    wait $!
	    return 0
	fi
    else
	tombsize=${SIZE}
    fi

    tombsize_4k=`expr $tombsize \* 1000 / 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"
    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 ${tombname}.tomb.key"

    # 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


    echo "${tombpass}" | gpg \
	--openpgp --batch --no-options --no-tty --passphrase-fd 0 2>/dev/null \
	-o "${tombdir}/${tombname}.tomb.key" -c -a ${keytmp}/tomb.tmp

    # 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
    sudo chown $UID:$GID ${tombfile}
    sudo chmod go-rwx ${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 ${tombfile}.key"

}

mount_tomb() {
    get_arg_tomb $CMD2
    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

    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`
    mapdate="`expr $mapdate / 60`"

    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 $c)"`
	fi
	echo "${tombpass}" \
	    | gpg --batch --passphrase-fd 0 --no-tty --no-options \
		  -d "${tombkey}" 2> /dev/null \
	    | cryptsetup --key-file - luksOpen ${nstloop} ${mapper}

	unset tombpass

	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 rw,noatime,nodev /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() {
  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 $MOUNTPOINT/$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
}

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.*'`
	    notice "Closing $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="`echo $mapper | cut -d. -f2`"
	tombmount=`mount -l | \
	    awk -vtomb="[$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="`echo $mapper | cut -d. -f2`"

    fi

    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"
    else
	notice "Closing tomb $tombname mounted on $tombmount"
    fi
    # check if there are binded dirs and close them first
    tombmount_esc="`echo ${tombmount} | sed 's:\/:\\\/:g'`"
    unbind=`mount | awk "/^$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"
		pidk=`lsof -t $b`
		for p in "$pidk"; do
		    pname=`pidof $p`
		    notice "Killing PID $p of $pname..."
		    kill -9 $p
		done
		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
	act "closing tomb $tombname mounted on $tombmount"
	umount ${tombmount} 2> /dev/null
	if ! [ $? = 0 ]; then
	    error "Tomb is busy, cannot umount!"
	    if [ $SLAM ]; then
		notice "Slamming tomb killing all processes using it"
		pidk=`lsof -t "$tombmount"`
		for p in "$pidk"; do
		    pname=`pidof $p`
		    func "killing PID $p of $pname..."
		    kill -9 $p
		done
		umount "${tombmount}"
	    else
		error "Cannot umount $tombname on $tombmount"
		return 1
	    fi
	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"

    notice "Tomb $tombname closed: your bones will rest in peace."
    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."
}

main () {
    echo $@ | grep '\-D' 2>&1 > /dev/null
    # ?????
    if [ $? = 0 ]; then
    fi

    ARGS=$@[@]

    OPTS=`getopt -o hvqDs:k:n -n 'tomb' -- "$@"`
    while true; do
	case "$1" in
	      -h)
		usage
		exit 0 ;;
	      -v)
		notice "Tomb  -  simple commandline tool for encrypted storage"
		act "version $VERSION ($DATE) by Jaromil @ dyne.org"
		# print out the GPL license in this file
		act ""
		cat $0 | awk 'BEGIN { license=0 } /^# This source/  { license=1 } { if(license==1) print " " $0 }
/MA 02139, USA.$/ { license=0 }'
		act ""
		exit 0 ;;
	      -q) QUIET=1; shift 1 ;;
	      -D)
		echo "[D] Tomb invoked with args \"${(f)@}\" "
		echo "[D] running on `date`"
		DEBUG=1; shift 1 ;;
	      -s) SIZE=$2; shift 2 ;;
	      -k) KEY=$2; shift 2 ;;
	      -n) NOBIND=1; shift 1 ;;
	      --) shift; break ;;
	       *) CMD=$1;
		  FILE=$2; MOUNT=$3; # compat with old args
		  CMD2=${2}; CMD3=${3}; break ;;
	esac
    done

    if ! [ $CMD ]; then
       error "first argument missing, use -h for help"
       exit 0
    fi

    func "Tomb command: $CMD $CMD2 $CMD3"

    case "$CMD" in
	 create) check_priv ; create_tomb ;;
	  mount) check_priv ; mount_tomb  ;;
	   open) check_priv ; mount_tomb  ;;
	 umount) check_priv ; umount_tomb ${CMD2} ;;
	unmount) check_priv ; umount_tomb ${CMD2} ;;
	  close) check_priv ; umount_tomb ${CMD2} ;;
	   slam) check_priv ; SLAM=1; umount_tomb ${CMD2} ;;
	   bury) if [ "$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} ;;
	install) check_priv ; install_tomb ;;
	askpass) ask_password $CMD2 ;;
	 status) tomb-status ;;
	 mktemp) safe_dir ${CMD2} ;;
	      *) error "command \"$CMD\" not recognized"
		 act "try -h for help"
		 return 1
		 ;;
    esac
    return 0
}

check_bin
main $@