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Tomb/tomb

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#!/bin/zsh
#
# Tomb, the Crypto Undertaker
#
# A commandline tool to easily operate encryption of secret data
#
# Homepage on: [tomb.dyne.org](http://tomb.dyne.org)
# {{{ License
# Copyright (C) 2007-2013 Dyne.org Foundation
#
# Tomb is designed, written and maintained by Denis Roio <jaromil@dyne.org>
#
# With contributions by Anathema, Boyska and Hellekin O. Wolf.
#
# Testing and reviews are contributed by Dreamer, Shining,
# Mancausoft, Asbesto Molesto and Nignux.
#
# Tomb's artwork is contributed by Jordi aka Mon Mort.
#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.
# }}} - License
# {{{ Global variables
VERSION=1.3
DATE="May/2013"
TOMBEXEC=$0
TOMBOPENEXEC="${TOMBEXEC}-open"
typeset -a OLDARGS
for arg in ${argv}; do OLDARGS+=($arg); done
DD="dd"
WIPE="rm -f"
MKFS="mkfs.ext3 -q -F -j -L"
STEGHIDE=1
MKTEMP=1
RESIZER=1
MOUNTOPTS="rw,noatime,nodev"
typeset -A global_opts
typeset -A opts
typeset -h username
typeset -h tombkeydir # global used if key comes from stdin
tombkeydir=""
typeset -h _uid
typeset -h _gid
typeset -h _tty
# Set a sensible PATH
PATH=/sbin:/bin:/usr/sbin:/usr/bin
[[ "$TOMBEXEC" =~ "^/usr/local" ]] && PATH="/usr/local/bin:/usr/local/sbin:$PATH"
# }}}
# {{{ Safety functions
_have_shm() {
# Check availability of 1MB of SHM
xxx "_have_shm 0 We need only 1 MB of RAM"
[[ -k /dev/shm ]] || return 1
local -i SHM RAM
SHM=$(df -k -B 4K -a -t tmpfs /dev/shm | awk '/\/dev\/shm/ { print $4; }')
(( $? )) && return 1
xxx "_have_shm 1 SHM $SHM KB are available"
RAM=$(awk '/MemFree/ { print $2 }' /proc/meminfo)
xxx "_have_shm 2 RAM $RAM KB are free"
(( $RAM >= 1024 )) && return 0
xxx "_have_shm 3 RAM $RAM KB left only :("
# Now we have more RAM than affected to SHM, so we can expect some for our little needs.
# Does that work when SHM is disabled from kernel config?
return 1
}
# Create temporary directories with caution
safe_dir() {
# Try and create our temporary directory in RAM
# Note that there's no warranty the underlying FS won't swap
# every 5 seconds (e.g., ext3)
local -i tries
while (( $tries < 3 )) ; do
tries+=1
if _have_shm; then
xxx "safe_dir creating $1 dir in RAM"
if (( $MKTEMP )); then
mktemp -d /dev/shm/$1.$$.XXXXXXX
else
dir="/dev/shm/$1.$$.$RANDOM$RANDOM"
mkdir -m 0700 -p "$dir"
print "$dir"
fi
return 0
else
_warning "WARNING: we cannot ensure we're running in RAM."
xxx "Wait a bit before retrying... (attempt $tries)"
sync && sleep 0.5
fi
done
_warning "WARNING: no RAM available for me to run safely."
return 1
}
# Provide a random filename in shared memory
safe_filename() {
_have_shm || die "No access to shared memory on this system, sorry."
(( $MKTEMP )) && \
mktemp -u /dev/shm/$1.$$.XXXXXXX || \
print "/dev/shm/$1.$$.$RANDOM$RANDOM"
}
# Check if swap is activated
check_swap() {
# Return 0 if NO swap is used, 1 if swap is used
# Return 2 if swap(s) is(are) used, but ALL encrypted
local swaps=$(awk '/partition/ { print $1 }' /proc/swaps 2>/dev/null)
[[ -z "$swaps" ]] && return 0 # No swap partition is active
no "An active swap partition is detected, this poses security risks."
no "You can deactivate all swap partitions using the command:"
no " swapoff -a"
no "But if you want to proceed like this, use the -f (force) flag."
die "Operation aborted."
}
# Ask user for a password
ask_password() {
# we use pinentry now
# comes from gpg project and is much more secure
# it also conveniently uses the right toolkit
# 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
title="Insert tomb password"
if [ $2 ]; then title="$2"; fi
output=`cat <<EOF | GTK2_RC_FILES=${GTK2_RC} pinentry 2>/dev/null | tail -n +7
OPTION ttyname=$TTY
OPTION lc-ctype=$LANG
SETTITLE $title
SETDESC $1
SETPROMPT Password:
GETPIN
EOF`
if [[ `tail -n1 <<<$output` =~ ERR ]]; then
return 1
fi
head -n1 <<<$output | awk '/^D / { sub(/^D /, ""); print }'
return 0
}
# Drop privileges
exec_as_user() {
if ! [ $SUDO_USER ]; then
exec $@[@]
return $?
fi
xxx "exec_as_user '$SUDO_USER': ${(f)@}"
sudo -u $SUDO_USER "${@[@]}"
return $?
}
#Escalate privileges
check_priv() {
# save original user
username=$USER
if [ $UID != 0 ]; then
xxx "Using sudo for root execution of 'tomb ${(f)OLDARGS}'"
# check if sudo has a timestamp active
sudok=false
if ! option_is_set --sudo-pwd; then
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 ${OLDARGS[@]}
SETPROMPT Insert your USER password:
GETPIN
EOF
fi
else
_verbose "Escalating privileges using sudo-pwd"
sudo -S -v <<<`option_value --sudo-pwd`
fi
sudo "${TOMBEXEC}" -U ${UID} -G ${GID} -T ${TTY} "${(@)OLDARGS}"
exit $?
fi # are we root already
# make sure necessary kernel modules are loaded
modprobe dm_mod
modprobe dm_crypt
return 0
}
# }}}
# {{{ Commandline interaction
usage() {
cat <<EOF
Syntax: tomb [options] command [file] [place]
Commands:
dig create a new empty TOMB file of --size in MB
forge create a new KEY file and set its password
lock installs a lock on a TOMB to use it with KEY
open open an existing TOMB
index update the search indexes of tombs
search looks for filenames matching text patterns
list list open TOMBs
close close a TOMB (or all)
slam slam a TOMB killing all programs using it
passwd change the password of a KEY
EOF
if [ "$RESIZER" = 1 ]; then
cat <<EOF
resize resize a TOMB to a new --size (can only grow)
EOF
fi
if [ "$STEGHIDE" = 1 ]; then
cat <<EOF
bury hide a KEY inside a JPEG image
exhume extract a KEY from a JPEG image
EOF
fi
cat <<EOF
Options:
-s size of the tomb file when creating/resizing one (in MB)
-k path to the key to be used ('-k -' to read from stdin)
-n don't process the hooks found in tomb
-o mount options used to open (default: rw,noatime,nodev)
-f force operation (i.e. even if swap is active)
-h print this help
-v print version, license and list of available ciphers
-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://github.com/dyne/tomb/issues>.
EOF
}
# Check an option
option_is_set() {
# First argument, the commandline flag (i.e. "-s").
# Second (optional) argument: if "out", command will print it out 'set'/'unset'
# (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;
}
# Get an option value
option_value() {
# First argument, the commandline flag (i.e. "-s").
<<< ${opts[$1]}
}
# Messaging function with pretty coloring
function _msg() {
local command="print -P"
local progname="$fg[magenta]${TOMBEXEC##*/}$reset_color"
local message="$fg_bold[normal]$fg_no_bold[normal]${2}$reset_color"
local -i returncode
case "$1" in
inline)
command+=" -n"; pchars=" > "; pcolor="yellow"
;;
message)
pchars=" . "; pcolor="white"; message="$fg_no_bold[$pcolor]${2}$reset_color"
;;
verbose)
pchars="[D]"; pcolor="blue"
;;
success)
pchars="(*)"; pcolor="green"; message="$fg_no_bold[$pcolor]${2}$reset_color"
;;
warning)
pchars="[W]"; pcolor="yellow"; message="$fg_no_bold[$pcolor]${2}$reset_color"
;;
failure)
pchars="[E]"; pcolor="red"; message="$fg_no_bold[$pcolor]${2}$reset_color"
returncode=1
;;
*)
pchars="[F]"; pcolor="red"
message="Developer oops! Usage: _msg MESSAGE_TYPE \"MESSAGE_CONTENT\""
returncode=127
;;
esac
${=command} "${progname} $fg_bold[$pcolor]$pchars$reset_color ${message}$color[reset_color]" >&2
return $returncode
}
function _message say() {
local notice="message"
[[ "$1" = "-n" ]] && shift && notice="inline"
option_is_set -q || _msg "$notice" "$1"
return 0
}
alias act="_message -n"
function _verbose xxx() {
option_is_set -D && _msg verbose "$1"
return 0
}
function _success yes() {
option_is_set -q || _msg success "$1"
return 0
}
function _warning no() {
option_is_set -q || _msg warning "$1"
return 1
}
function _failure die() {
typeset -i exitcode=${2:-1}
option_is_set -q || _msg failure "$1"
exit $exitcode
}
# Print out progress to inform GUI caller applications (--batch mode)
progress() {
# $1 is "what is progressing"
# $2 is "percentage"
# $3 is (eventually blank) status
# Example: if creating a tomb, it could be sth like
# progress create 0 filling with random data
# progress create 40 generating key
# progress keygen 0 please move the mouse
# progress keygen 30 please move the mouse
# progress keygen 60 please move the mouse
# progress keygen 100 key generated
# progress create 80 please enter password
# progress create 90 formatting the tomb
# progress create 100 tomb created successfully
if ! option_is_set --batch; then
return
fi
print "[m][P][$1][$2][$3]" >&2
}
# Check what's installed
check_bin() {
# check for required programs
for req in cryptsetup pinentry sudo gpg; do
command -v $req >/dev/null || die "Cannot find $req. It's a requirement to use Tomb, please install it." 1
done
export PATH=/sbin:/usr/sbin:$PATH
# which dd command to use
command -v dcfldd > /dev/null
{ test $? = 0 } && { DD="dcfldd statusinterval=1" }
# which wipe command to use
command -v wipe > /dev/null && WIPE="wipe -f -s" || WIPE="rm -f"
# check for filesystem creation progs
command -v mkfs.ext4 > /dev/null && \
MKFS="mkfs.ext4 -q -F -j -L" || \
MKFS="mkfs.ext3 -q -F -j -L"
# check for mktemp
command -v mktemp > /dev/null || MKTEMP=0
# check for steghide
command -v steghide > /dev/null || STEGHIDE=0
# check for resize
command -v e2fsck resize2fs > /dev/null || RESIZER=0
if which tomb-kdf-pbkdf2 &> /dev/null; then
KDF_PBKDF2="tomb-kdf-pbkdf2"
else
local our_pbkdf2
our_pbkdf2="$(dirname $(readlink -f $TOMBEXEC))/kdf/tomb-kdf-pbkdf2"
if which $our_pbkdf2 &> /dev/null; then
KDF_PBKDF2=$our_pbkdf2
else
KDF_PBKDF2=
fi
fi
}
# }}} - Commandline interaction
# {{{ Key operations
# This function retrieves a tomb key specified on commandline or one
# laying nearby the tomb if found, or from stdin if the option was
# selected. It also runs validity checks on the file. Callers should
# always use drop_key() when done with all key operations.
# On success returns 0 and prints out the full path to the key
load_key() {
# check if the key is set manually then use the one existing
local tombdir="$1"
local tombname="$2"
local tombkey=""
if option_is_set -k ; then
if [[ "`option_value -k`" == "-" ]]; then
# take key from stdin
tombkeydir=`safe_dir tomb`
cat > ${tombkeydir}/stdin.tmp
tombkey=${tombkeydir}/stdin.tmp
xxx " `ls -lh ${tombkey}`"
else
# take key from a file
tombkey=`option_value -k`
fi
else
# guess key as lying besides the tomb
tombkey=${tombdir}/${tombname}.tomb.key
fi
if [ -r "${tombkey}" ]; then
_message "We'll use this key:"
_message " `ls -lh ${tombkey}`"
else
return 1
fi
# this does a check on the file header
if ! is_valid_key ${tombkey}; then
_warning "The key seems invalid, the application/pgp header is missing"
return 1
fi
print "$tombkey"
return 0
}
# This function asks the user for the password to use the key it tests
# it against the return code of gpg on success returns 0 and prints
# the password (be careful about where you save it!)
ask_key_password() {
tombkey="$1"
local keyname=`basename $tombkey`
_message "a password is required to use key ${keyname}"
local passok=0
local tombpass=""
if option_is_set --tomb-pwd; then
tombpass=`option_value --tomb-pwd`
else
for c in 1 2 3; do
if [ $c = 1 ]; then
tombpass=`exec_as_user ${TOMBEXEC} askpass "Insert password to use key: $keyname"`
else
tombpass=`exec_as_user ${TOMBEXEC} askpass "Insert password to use key: $keyname (retry $c)"`
fi
if [[ $? != 0 ]]; then
_warning "User aborted password dialog"
return 1
fi
get_lukskey "$tombpass" ${tombkey} >/dev/null
if [ $? = 0 ]; then
passok=1; _message "Password OK."
break;
fi
done
fi
{ test "$passok" = "1" } || { return 1 }
print "$tombpass"
unset $tombpass
return 0
}
# change tomb key password
change_passwd() {
_message "Commanded to change password for tomb key $1"
if ! option_is_set -f && ! option_is_set --ignore-swap; then check_swap; fi
local keyfile="$1" # $1 is the tomb key path
# check the keyfile
if ! [ -r $keyfile ]; then
_warning "key not found: $keyfile"
return 1
fi
if ! is_valid_key $keyfile ; then
_warning "file doesn't seems to be a tomb key: $keyfile"
_warning "operation aborted."
return 1
fi
local tmpnewkey lukskey c tombpass tombpasstmp
tmpnewkey=`safe_filename tombnew`
lukskey=`safe_filename tombluks`
_success "Changing password for $keyfile"
tombpass=`ask_key_password $keyfile`
{ test $? = 0 } || {
die "No valid password supplied" }
get_lukskey "${tombpass}" ${keyfile} > ${lukskey};
drop_key
{
gen_key $lukskey > ${tmpnewkey}
if ! is_valid_key $tmpnewkey; then
die "Error: the newly generated keyfile does not seem valid"
else
# copy the new key as the original keyfile name
cp "${tmpnewkey}" "${keyfile}"
_success "Your passphrase was successfully updated."
fi
} always {
_verbose "cleanup: $tmpnewkey $lukskey"
# wipe all temp file
${=WIPE} "${tmpnewkey}"
${=WIPE} "${lukskey}"
}
return $?
}
# To be called after load_key()
drop_key() {
{ test "$tombkeydir" = "" } && { return 0 }
{ test -r ${tombkeydir}/stdin.tmp } && {
${=WIPE} ${tombkeydir}/stdin.tmp; rmdir ${tombkeydir} }
}
#$1 is the keyfile we are checking
is_valid_key() {
# this header validity check is a virtuosism by Hellekin
[[ `file =(awk '/^-+BEGIN/,0' $1) -bi` =~ application/pgp ]]
return $?
}
# Gets a key file and a password, prints out the decoded contents to
# be used directly by Luks as a cryptographic key
get_lukskey() {
# $1 is the password, $2 is the keyfile
local tombpass=$1
local keyfile=$2
firstline=`head -n1 $keyfile`
xxx "get_lukskey XXX $keyfile"
if [[ $firstline =~ '^_KDF_' ]]; then
_verbose "KDF: `cut -d_ -f 3 <<<$firstline`"
case `cut -d_ -f 3 <<<$firstline` in
pbkdf2sha1)
if [[ -z $KDF_PBKDF2 ]]; then
die "The tomb use kdf method 'pbkdf2', which is unsupported on your system"
fi
pbkdf2_param=`cut -d_ -f 4- <<<$firstline | tr '_' ' '`
tombpass=$(${KDF_PBKDF2} ${=pbkdf2_param} 2> /dev/null <<<$tombpass)
;;
*)
_failure "No suitable program for KDF `cut -f 3 <<<$firstline`"
unset tombpass
return 1
;;
esac
fi
# fix for gpg 1.4.11 where the --status-* options don't work ;^/
gpgver=`gpg --version | awk '/^gpg/ {print $3}'`
if [ "$gpgver" = "1.4.11" ]; then
xxx "GnuPG is version 1.4.11 - adopting status fix"
print ${tombpass} | \
gpg --batch --passphrase-fd 0 --no-tty --no-options -d "${keyfile}"
unset tombpass
ret=$?
else # using status-file in gpg != 1.4.12
res=`safe_filename tomb.open`
{ test $? = 0 } || { unset tombpass; die "Fatal error creating temp file." }
print ${tombpass} | \
gpg --batch --passphrase-fd 0 --no-tty --no-options --status-fd 2 \
--no-mdc-warning --no-permission-warning --no-secmem-warning \
-d "${keyfile}" 2>$res
unset tombpass
grep 'DECRYPTION_OKAY' $res
ret=$?; rm -f $res
fi
xxx "get_lukskey returns $ret"
return $ret
}
# takes care to encrypt a key
# honored options: --kdf --tomb-pwd
gen_key() {
# $1 the lukskey to encrypt
local lukskey=$1
# here user is prompted for key password
local tombpass=""
local tombpasstmp=""
if ! option_is_set --tomb-pwd; then
while true; do
# 3 tries to write two times a matching password
tombpass=`exec_as_user ${TOMBEXEC} askpass "Secure key for ${tombname}"`
if [[ $? != 0 ]]; then
die "User aborted"
fi
if [ -z $tombpass ]; then
_warning "you set empty password, which is not possible"
continue
fi
tombpasstmp=$tombpass
tombpass=`exec_as_user ${TOMBEXEC} askpass "Secure key for ${tombname} (again)"`
if [[ $? != 0 ]]; then
die "User aborted"
fi
if [ "$tombpasstmp" = "$tombpass" ]; then
break;
fi
unset tombpasstmp
unset tombpass
done
else
tombpass=`option_value --tomb-pwd`
fi
# KDF is a new key strenghtening technique against brute forcing
# see: https://github.com/dyne/Tomb/issues/82
_verbose "KDF method chosen is: '`option_value --kdf`'"
kdf_method=$(cut -d: -f1 <<<`option_value --kdf` )
case $kdf_method in
pbkdf2)
if [[ -z $KDF_PBKDF2 ]]; then
die "The tomb use kdf method 'pbkdf2', which is unsupported on your system"
fi
# --kdf takes one parameter: iter time (on present machine) in seconds
seconds=$(cut -d: -f2 -s <<<`option_value --kdf`)
if [[ -z $seconds ]]; then
seconds=1
fi
local -i microseconds
microseconds=$((seconds*1000000))
_verbose "Microseconds: $microseconds"
pbkdf2_salt=`${KDF_PBKDF2}-gensalt`
pbkdf2_iter=`${KDF_PBKDF2}-getiter $microseconds`
# We use a length of 64bytes = 512bits (more than needed!?)
tombpass=`${KDF_PBKDF2} $pbkdf2_salt $pbkdf2_iter 64 <<<"${tombpass}"`
header="_KDF_pbkdf2sha1_${pbkdf2_salt}_${pbkdf2_iter}_64\n"
;;
""|null)
header=""
;;
*)
_warning "KDF method non recognized"
return 1
header=""
;;
esac
echo -n $header
print "${tombpass}" \
| gpg --openpgp --batch --no-options --no-tty --passphrase-fd 0 2>/dev/null \
-o - -c -a ${lukskey}
unset tombpass
}
# prints an array of ciphers available in gnupg (to encrypt keys)
list_gnupg_ciphers() {
# prints an error if GnuPG is not found
which gpg > /dev/null || die "gpg (GnuPG) is not found, Tomb cannot function without it."
ciphers=(`gpg --version | awk '
BEGIN { ciphers=0 }
/^Cipher:/ { gsub(/,/,""); sub(/^Cipher:/,""); print; ciphers=1; next }
/^Hash:/ { ciphers=0 }
{ if(ciphers==0) { next } else { gsub(/,/,""); print; } }
'`)
echo " ${ciphers}"
return 1
}
# Steganographic function to bury a key inside an image.
bury_key() {
tombkey=$1
imagefile=$2
file $tombkey | grep PGP > /dev/null
if [ $? != 0 ]; then
_warning "encode failed: $tombkey is not a tomb key"
return 1
fi
file $imagefile | grep JPEG > /dev/null
if [ $? != 0 ]; then
_warning "encode failed: $imagefile is not a jpeg image"
return 1
fi
_success "Encoding key $tombkey inside image $imagefile"
_message "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 "Steg password for ${tombkey}"`
tombpasstmp=$tombpass
tombpass=`exec_as_user ${TOMBEXEC} askpass "Steg password for ${tombkey} (again)"`
if [ "$tombpasstmp" = "$tombpass" ]; then
break;
fi
unset tombpasstmp
unset tombpass
done
if [ -z $tombpass ]; then
_warning "passwords don't match, aborting operation."
return 1
fi
# Requires steghide to be installed
awk '
/^-----/ {next}
/^Version/ {next}
{print $0}' ${tombkey} \
| steghide embed --embedfile - --coverfile ${imagefile} \
-p ${tombpass} -z 9 -e serpent cbc
if [ $? != 0 ]; then
_warning "encoding error: steghide reports problems"
res=1
else
_success "tomb key encoded succesfully into image ${imagefile}"
res=0
fi
unset tombpass
return $res
}
# Steganographic function to exhume a key buries into an image
exhume_key() {
tombname=$1
imagefile=$2
res=1
file $imagefile | grep JPEG > /dev/null
if [ $? != 0 ]; then
_warning "encode failed: $imagefile is not a jpeg image"
return 1
fi
keyfile=${tombname%%\.*}.tomb.key
if [[ -e "$keyfile" ]]; then
_warning "Key file $keyfile already exist."
return 1
fi
_message "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 "Steg password for ${keyfile}"`
else
tombpass=`exec_as_user ${TOMBEXEC} askpass "Steg password for $keyfile (retry $c)"`
fi
# always steghide required
steghide extract -sf ${imagefile} -p ${tombpass} -xf - \
| awk '
BEGIN {
print "-----BEGIN PGP MESSAGE-----"
}
{ print $0 }
END {
print "-----END PGP MESSAGE-----"
}' > ${keyfile}
if [ "`cat ${keyfile} | wc -l`" != "3" ]; then
_success "${keyfile} succesfully decoded"
res=0
break;
fi
done
unset tombpass
if [ $res != 0 ]; then
_warning "nothing found."
fi
return $res
}
# }}} - Key handling
# {{{ Create
# This is a new way to create tombs which dissects the whole create_tomb() into 3 clear steps:
#
# * dig a .tomb (the large file) using /dev/random (takes some minutes at least)
#
# * forge a .key (the small file) using /dev/urandom (good entropy needed)
#
# * lock the .tomb file with the key, binding the key to the tomb (requires dm_crypt format)
forge_key() {
_message "Commanded to forge key $1"
if ! [ $1 ]; then
_warning "no key name specified for creation"
return 1
fi
# if swap is on, we remind the user about possible data leaks to disk
if ! option_is_set -f && ! option_is_set --ignore-swap; then check_swap; fi
# create the keyfile in tmpfs so that we leave less traces in RAM
keytmp=`safe_dir tomb`
(( $? )) && die "error creating temp dir"
xxx "safe_dir at $keytmp"
mount tmpfs "${keytmp}" -t tmpfs -o size=1m
if [ $? != 0 ]; then
_warning "cannot mount tmpfs filesystem in volatile memory"
rm -r "${keytmp}"
die "operation aborted."
fi
tombkey="$1"
_message "this operation takes time, keep using this computer on other tasks,"
_message "once done you will be asked to choose a password for your tomb."
_message "To make it faster you can move the mouse around."
_message "If you are on a server, you can use an Entropy Generation Daemon."
touch ${keytmp}/tomb.tmp
chmod 0600 ${keytmp}/tomb.tmp
random_source=/dev/random
if option_is_set --use-urandom; then
random_source=/dev/urandom
fi
xxx "Data dump using ${DD[1]} from $random_source"
${=DD} bs=1 count=256 if=$random_source of=${keytmp}/tomb.tmp
if ! [ -r ${keytmp}/tomb.tmp ]; then
_warning "cannot generate encryption key"
umount ${keytmp}
rm -r $keytmp
die "operation aborted."
fi
_success "Choose the password of your key: ${tombkey}"
_message "(you can also change it later using 'tomb passwd')"
touch ${tombkey}
chown ${_uid}:${_gid} ${tombkey}
chmod 0600 ${tombkey}
tombname="$tombkey"
# the gen_key() function takes care of the new key's encryption
gen_key ${keytmp}/tomb.tmp > ${tombkey}
# this does a check on the file header
if ! is_valid_key ${tombkey}; then
_warning "The key does not seem to be valid"
_warning "Dumping contents to screen:"
cat ${tombkey}
_warning "--"
umount ${keytmp}
rm -r $keytmp
die "operation aborted."
fi
${=WIPE} ${keytmp}/tomb.tmp # no need really, but anyway
umount ${keytmp}
rm -r ${keytmp}
chown ${_uid}:${_gid} ${tombkey}
_message "done forging $tombkey"
_success "Your key is ready:"
ls -lh ${tombkey}
}
# Dig a tomb, means that it will create an empty file to be formatted
# as a loopback filesystem. Initially the file is filled with random data
# taken from /dev/urandom which improves the tomb's overall security
dig_tomb() {
_message "Commanded to dig tomb $1"
# if swap is on, we remind the user about possible data leaks to disk
if ! option_is_set -f && ! option_is_set --ignore-swap; then check_swap; fi
if ! [ $1 ]; then
_warning "no tomb name specified for creation"
return 1
fi
tombfile=`basename $1`
tombdir=`dirname $1`
# make sure the file has a .tomb extension
tombname=${tombfile%%\.*}
tombfile=${tombname}.tomb
# require the specification of the size of the tomb (-s) in MB
tombsize="`option_value -s`"
[ $tombsize ] || die "Size argument missing, use --size"
[[ $tombsize != <-> ]] && die "Size argument is not an integer"
[[ $tombsize -lt 10 ]] && die "Tombs can't be smaller than 10 megabytes"
if [ -e ${tombdir}/${tombfile} ]; then
_warning "A tomb exists already. I'm not digging here:"
_warning " `ls -lh ${tombdir}/${tombfile}`"
return 1
fi
_success "Creating a new tomb in ${tombdir}/${tombfile}"
_message "Generating ${tombfile} of ${tombsize}MiB"
# we will first touch the file and set permissions: this way, even if interrupted, permissions are right
touch ${tombdir}/${tombfile}
chmod 0600 "${tombdir}/${tombfile}"
chown $_uid:$_gid "${tombdir}/${tombfile}"
xxx "Data dump using ${DD[1]} from /dev/urandom"
${=DD} if=/dev/urandom bs=1048576 count=${tombsize} of=${tombdir}/${tombfile}
if [ $? = 0 -a -e ${tombdir}/${tombfile} ]; then
_message " `ls -lh ${tombdir}/${tombfile}`"
else
die "Error creating the tomb ${tombdir}/${tombfile}, operation aborted."
fi
_success "Done digging $tombname"
_message "your tomb is not yet ready, you need to forge a key and lock it:"
_message "tomb forge ${tombname}.tomb.key"
_message "tomb lock ${tombname}.tomb ${tombname}.tomb.key"
}
# this function locks a tomb with a key file
# in fact LUKS formatting the loopback volume
# it take arguments as the LUKS cipher to be used
lock_tomb_with_key() {
if ! [ $1 ]; then
_warning "no tomb specified for locking"
_warning "usage: tomb lock file.tomb file.tomb.key"
return 1
fi
tombfile=`basename $1`
_message "Commanded to lock tomb ${tombfile}"
tombdir=`dirname $1`
# make sure the file has a .tomb extension
tombname=${tombfile%%\.*}
tombfile=${tombname}.tomb
{ test -f ${tombdir}/${tombfile} } || {
die "There is no tomb here. You have to it dig first."
return 1 }
xxx "tomb found: ${tombdir}/${tombfile}"
nstloop=`losetup -f` # get the number for next loopback device
losetup -f ${tombdir}/${tombfile} # allocates the next loopback for our file
xxx "loop mounted on ${nstloop}"
_message "checking if the tomb is empty (we never step on somebody else's bones)"
cryptsetup isLuks ${nstloop}
if [ $? = 0 ]; then
# is it a LUKS encrypted nest? then bail out and avoid reformatting it
_warning "The tomb was already locked with another key"
losetup -d ${nstloop}
die "Operation aborted. I cannot lock an already locked tomb. Go dig a new one."
else
_message "fine, this tomb seems empty."
fi
# load key from options or file
tombkey=`load_key ${tombdir} ${tombname}`
{ test $? = 0 } || {
losetup -d $nstloop
die "Aborting operations: error loading key $tombkey" }
# make sure to call drop_key later
# the encryption cipher for a tomb can be set at creation using -o
if option_is_set -o; then
cipher="`option_value -o`"
else
cipher="aes-cbc-essiv:sha256"
fi
_message "locking using cipher: $cipher"
# get the pass from the user and check it
tombpass=`ask_key_password "$tombkey"`
{ test $? = 0 } || {
losetup -d ${nstloop}
die "No valid password supplied" }
_success "Locking ${tombfile} with ${tombkey}"
_message "formatting Luks mapped device"
get_lukskey "${tombpass}" ${tombkey} | \
cryptsetup --key-file - --batch-mode \
--cipher ${cipher} --key-size 256 --key-slot 0 \
luksFormat ${nstloop}
if ! [ $? = 0 ]; then
_warning "cryptsetup luksFormat returned an error"
unset tombpass
losetup -d $nstloop
die "Operation aborted."
fi
get_lukskey "${tombpass}" ${tombkey} | \
cryptsetup --key-file - \
--cipher ${cipher} luksOpen ${nstloop} tomb.tmp
if ! [ $? = 0 ]; then
_warning "cryptsetup luksOpen returned an error"
unset tombpass
losetup -d $nstloop
die "Operation aborted."
fi
# cleanup tombs
unset tombpass
drop_key # make sure all temp files are out
_message "formatting your Tomb with Ext3/Ext4 filesystem"
${=MKFS} ${tombname} /dev/mapper/tomb.tmp
if [ $? != 0 ]; then
_warning "Tomb format returned an error"
_warning "your tomb ${tombfile} may be corrupted."
fi
sync
cryptsetup luksClose tomb.tmp
losetup -d ${nstloop}
_message "done locking $tombname using Luks dm-crypt ${create_cipher}"
_success "Your tomb is ready in ${tombdir}/${tombfile} and secured with key ${tombkey}"
}
# backward compatibility
create_tomb() {
if ! [ $1 ]; then
_warning "no tomb name specified for creation"
return 1
fi
dig_tomb ${=PARAM}
{ test $? = 0 } || { die "Failed to dig tomb, operation aborted." }
tombfile=`basename $1`
tombdir=`dirname $1`
# make sure the file has a .tomb extension
tombname=${tombfile%%\.*}
tombfile=${tombname}.tomb
forge_key ${tombfile}.key
{ test $? = 0 } || { die "Failed to forge key, operation aborted." }
lock_tomb_with_key ${tombfile} -l ${tombfile}.key
{ test $? = 0 } || { die "Failed to lock tomb with key, operation aborted." }
yes "Tomb $tombname succesfully created"
ls -l ${tombfile}*
}
# }}} - Creation
# {{{ Open
# $1 = tombfile $2(optional) = mountpoint
mount_tomb() {
_message "Commanded to open tomb $1"
if ! option_is_set -f && ! option_is_set --ignore-swap; then check_swap; fi
if ! [ ${1} ]; then
_warning "no tomb name specified for creation"
return 1
fi
# set up variables to be used
# the full path is made with $tombdir/$tombfile
local tombkey
local tombfile
local tombdir
local tombname
tombfile=`basename ${1}`
tombdir=`dirname ${1}`
# check file type (if its a Luks fs)
file ${tombdir}/${tombfile} | grep -i 'luks encrypted file' 2>&1 >/dev/null
if [ $? != 0 ]; then
_warning "$1 is not a valid tomb file, operation aborted"
return 1
fi
tombname=${tombfile%%\.*}
xxx "tomb found: ${tombdir}/${tombfile}"
# load_key called here
tombkey=`load_key ${tombdir} ${tombname}`
{ test $? = 0 } || {
die "Aborting operations: error loading key $tombkey" }
if [ "$2" = "" ]; then
tombmount=/media/${tombfile}
_message "mountpoint not specified, using default: $tombmount"
else
tombmount=$2
fi
# check if its already open
mount -l | grep "${tombfile}.*\[$tombname\]$" 2>&1 > /dev/null
if [ $? = 0 ]; then
_warning "$tombname is already open."
_message "here below its status is reported:"
list_tombs ${tombname}
return 1
fi
_success "Opening $tombfile on $tombmount"
nstloop=`losetup -f`
if [ $? = 255 ]; then
die "too many tomb opened. Please close any of them to open another tomb"
fi
losetup -f ${tombdir}/${tombfile}
cryptsetup isLuks ${nstloop}
if [ $? != 0 ]; then
# is it a LUKS encrypted nest? see cryptsetup(1)
_warning "$tombfile is not a valid Luks encrypted storage file"
return 1
fi
say "this tomb is a valid LUKS encrypted device"
luksdump="`cryptsetup luksDump ${nstloop}`"
tombdump=(`print $luksdump | awk '
/^Cipher name/ {print $3}
/^Cipher mode/ {print $3}
/^Hash spec/ {print $3}'`)
say "cipher is \"$tombdump[1]\" mode \"$tombdump[2]\" hash \"$tombdump[3]\""
slotwarn=`print $luksdump | awk '
BEGIN { zero=0 }
/^Key slot 0/ { zero=1 }
/^Key slot.*ENABLED/ { if(zero==1) print "WARN" }'`
{ test "$slotwarn" = "WARN" } && {
_warning "Multiple key slots are enabled on this tomb. Beware: there can be a backdoor." }
# save date of mount in minutes since 1970
mapdate=`date +%s`
mapper="tomb.${tombname}.${mapdate}.`basename $nstloop`"
keyname=`basename $tombkey | cut -d. -f1`
tombpass=`ask_key_password $tombkey`
{ test $? = 0 } || {
die "No valid password supplied" }
get_lukskey "${tombpass}" ${tombkey} | \
cryptsetup --key-file - luksOpen ${nstloop} ${mapper}
# key dropped here
drop_key
unset tombpass
if ! [ -r /dev/mapper/${mapper} ]; then
losetup -d ${nstloop}
die "failure mounting the encrypted file"
fi
# array: [ cipher, keysize, loopdevice ]
tombstat=(`cryptsetup status ${mapper} | awk '
/cipher:/ {print $2}
/keysize:/ {print $2}
/device:/ {print $2}'`)
yes "Success unlocking tomb $tombname"
xxx "key size is $tombstat[2] for cipher $tombstat[1]"
_message "checking filesystem via $tombstat[3]"
fsck -p -C0 /dev/mapper/${mapper}
xxx "tomb engraved as $tombname"
tune2fs -L ${tombname} /dev/mapper/${mapper} > /dev/null
# we need root from here on
mkdir -p $tombmount
mount -o $MOUNTOPTS /dev/mapper/${mapper} ${tombmount}
chown ${_uid}:${_gid} ${tombmount}
chmod 0750 ${tombmount}
_success "Success opening $tombfile on $fg_bold[white]$tombmount$fg_no_bold[white]"
# print out when was opened the last time, by whom and where
{ test -r ${tombmount}/.last } && {
tombtty="`cat ${tombmount}/.tty`"
tombhost="`cat ${tombmount}/.host`"
tombuid="`cat ${tombmount}/.uid`"
tomblast="`cat ${tombmount}/.last`"
tombuser=`awk -F: '/:'"$tombuid"':/ {print $1}' /etc/passwd`
say "last visit by $fg_bold[white]$tombuser($tombuid)$fg_no_bold[white] from $fg_bold[white]$tombtty$fg_no_bold[white] on $fg_bold[white]$tombhost$fg_no_bold[white]"
say "on date $fg_bold[white]`date --date @${tomblast} +%c`$fg_no_bold[white]"
}
# write down the UID and TTY that opened the tomb
rm -f ${tombmount}/.uid
echo ${_uid} > ${tombmount}/.uid
rm -f ${tombmount}/.tty
echo ${_tty} > ${tombmount}/.tty
# also the hostname
rm -f ${tombmount}/.host
echo `hostname` > ${tombmount}/.host
# and the "last time opened" information
# in minutes since 1970, this is printed at next open
rm -f ${tombmount}/.last
echo "`date +%s`" > ${tombmount}/.last
# human readable: date --date=@"`cat .last`" +%c
# process bind-hooks (mount -o bind of directories)
# and post-hooks (execute on open)
if ! option_is_set -n ; then
exec_safe_bind_hooks ${tombmount}
exec_safe_post_hooks ${tombmount} open
fi
return 0
}
# ## Hooks execution
exec_safe_bind_hooks() {
if [[ -n ${(k)opts[-o]} ]]; then
MOUNTOPTS=${opts[-o]}
fi
local MOUNTPOINT="${1}"
local ME=${SUDO_USER:-$(whoami)}
local HOME=$(awk -v a="$ME" -F ':' '{if ($1 == a) print $6}' /etc/passwd 2>/dev/null)
if [ $? -ne 0 ]; then
_warning "how pitiful! A tomb, and no HOME"
return 1
fi
if [ -z "$MOUNTPOINT" -o ! -d "$MOUNTPOINT" ]; then
_warning "cannot exec bind hooks without a mounted tomb."
return 1
fi
if ! [ -r "$MOUNTPOINT/bind-hooks" ]; then
xxx "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 "${dir[1,2]}" = ".." ]; then
_warning "bind-hooks map format: local/to/tomb local/to/\$HOME"
continue
fi
if [ "${${maps[$dir]}[1]}" = "/" -o "${${maps[$dir]}[1,2]}" = ".." ]; then
_warning "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
_warning "bind-hook target not existent, skipping $HOME/${maps[$dir]}"
elif [ ! -r "$MOUNTPOINT/$dir" ]; then
_warning "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
}
# Post mount hooks
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
_success "post hooks found, executing as user $SUDO_USER"
exec_as_user ${mnt}/post-hooks $2
fi
}
# }}} - Tomb open
# {{{ List
# list all tombs mounted in a readable format
# $1 is optional, to specify a tomb
list_tombs() {
# list all open tombs
mounted_tombs=(`list_tomb_mounts $1`)
{ test ${#mounted_tombs} = 0 } && {
die "I can't see any ${1:-open} tomb, may they all rest in peace." }
for t in ${mounted_tombs}; do
mapper=`basename ${t[(ws:;:)1]}`
tombname=${t[(ws:;:)5]}
tombmount=${t[(ws:;:)2]}
tombfs=${t[(ws:;:)3]}
tombfsopts=${t[(ws:;:)4]}
tombloop=${mapper[(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`
# find out who opens it from where
{ test -r ${tombmount}/.tty } && {
tombtty="`cat ${tombmount}/.tty`"
tombhost="`cat ${tombmount}/.host`"
tombuid="`cat ${tombmount}/.uid`"
tombuser=`awk -F: '/:'"$tombuid"':/ {print $1}' /etc/passwd`
}
if option_is_set --get-mountpoint; then
echo $tombmount
continue
fi
# breaking up such strings is good for translation
print -n "$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_no_bold[white] open since "
print "$fg_bold[white]$tombsince$fg_no_bold[white]"
{ test "$tombtty" = "" } || {
print -n "$fg_no_bold[green]$tombname"
print -n "$fg_no_bold[white] open by "
print -n "$fg_bold[white]$tombuser"
print -n "$fg_no_bold[white] from "
print -n "$fg_bold[white]$tombtty"
print -n "$fg_no_bold[white] on "
print "$fg_bold[white]$tombhost"
}
print -n "$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 [[ ${tombp} -ge 90 ]]; then
print -n "$fg_no_bold[green]$tombname"
print "$fg_bold[red] Your tomb is almost full!"
fi
# now check hooks
mounted_hooks=(`list_tomb_binds $tombname`)
for h in ${mounted_hooks}; do
print -n "$fg_no_bold[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
}
# print out an array of mounted tombs (internal use)
# format is semi-colon separated list of attributes
# if 1st arg is supplied, then list only that tomb
#
# String positions in the semicolon separated array:
#
# 1. full mapper path
#
# 2. mountpoint
#
# 3. filesystem type
#
# 4. mount options
#
# 5. tomb name
list_tomb_mounts() {
if [ "$1" = "" ]; then
# list all open tombs
mount -l \
| awk '
BEGIN { main="" }
/^\/dev\/mapper\/tomb/ {
if(main==$1) next;
print $1 ";" $3 ";" $5 ";" $6 ";" $7
main=$1
}
'
else
# list a specific tomb
mount -l \
| awk -vtomb="[$1]" '
BEGIN { main="" }
/^\/dev\/mapper\/tomb/ {
if($7!=tomb) next;
if(main==$1) next;
print $1 ";" $3 ";" $5 ";" $6 ";" $7
main=$1
}
'
fi
}
# list_tomb_binds
# print out an array of mounted bind hooks (internal use)
# format is semi-colon separated list of attributes
# needs an argument: name of tomb whose hooks belong
list_tomb_binds() {
if [ "$1" = "" ]; then
_failure "internal error: list_tomb_binds called without argument."; fi
# list bind hooks on util-linux 2.20 (Debian 7)
mount -l \
| awk -vtomb="$1" '
BEGIN { main="" }
/^\/dev\/mapper\/tomb/ {
if($7!=tomb) next;
if(main=="") { main=$1; next; }
if(main==$1)
print $1 ";" $3 ";" $5 ";" $6 ";" $7
}
'
# list bind hooks on util-linux 2.17 (Debian 6)
tombmount=`mount -l \
| awk -vtomb="$1" '
/^\/dev\/mapper\/tomb/ { if($7!=tomb) next; print $3; exit; }'`
mount -l | grep "^$tombmount" \
| awk -vtomb="$1" '
/bind/ { print $1 ";" $3 ";" $5 ";" $6 ";" $7 }'
}
# }}} - Tomb list
# {{{ Index and search
# index files in all tombs for search
# $1 is optional, to specify a tomb
index_tombs() {
{ command -v updatedb > /dev/null } || {
die "Cannot index tombs on this system: updatedb not installed" }
mounted_tombs=(`list_tomb_mounts $1`)
{ test ${#mounted_tombs} = 0 } && {
if [ $1 ]; then die "There seems to be no open tomb engraved as [$1]"
else die "I can't see any open tomb, may they all rest in peace."
fi
}
yes "Creating and updating search indexes"
for t in ${mounted_tombs}; do
mapper=`basename ${t[(ws:;:)1]}`
tombname=${t[(ws:;:)5]}
tombmount=${t[(ws:;:)2]}
{ test -r ${tombmount}/.noindex } && {
say "skipping $tombname (.noindex found)"
continue }
say "indexing $tombname"
updatedb -l 0 -o ${tombmount}/.updatedb -U ${tombmount}
say "search index updated"
done
}
search_tombs() {
{ command -v locate > /dev/null } || {
die "Cannot index tombs on this system: updatedb not installed" }
# list all open tombs
mounted_tombs=(`list_tomb_mounts $1`)
{ test ${#mounted_tombs} = 0 } && {
die "I can't see any open tomb, may they all rest in peace." }
shift
yes "Searching for: $fg_bold[white]${=@}$fg_no_bold[white]"
for t in ${mounted_tombs}; do
xxx "checking for index: ${t}"
mapper=`basename ${t[(ws:;:)1]}`
tombname=${t[(ws:;:)5]}
tombmount=${t[(ws:;:)2]}
if [ -r ${tombmount}/.updatedb ]; then
say "Searching in tomb $tombname"
locate -d ${tombmount}/.updatedb -e -i ${=@}
say "Matches found: `locate -d ${tombmount}/.updatedb -e -i -c ${=@}`"
else
no "skipping tomb $tombname: not indexed"
no "run 'tomb index' to create indexes"
fi
done
}
# }}} - Index and search
# {{{ Resize
# resize tomb file size
resize_tomb() {
_message "Commanded to resize tomb $1 to $opts[-s] megabytes"
if ! [ $1 ]; then
_failure "No tomb name specified for resizing"
elif ! [ -r "$1" ]; then
_failure "Cannot find $1"
fi
# $1 is the tomb file path
local c tombpass tombkey
local tombfile=`basename $1`
local tombdir=`dirname $1`
# make sure the file has a .tomb extension
local tombname=${tombfile%%\.*}
tombfile=${tombname}.tomb
# load key from options or file
tombkey=`load_key ${tombdir} ${tombname}`
{ test $? = 0 } || {
die "Aborting operations: error loading key $tombkey" }
# make sure to call drop_key later
local tmp_resize=`safe_filename tmbrsz`
local newtombsize=$opts[-s]
local oldtombsize=`stat -c %s "$1" 2>/dev/null`
local mounted_tomb=`mount -l |
awk -vtomb="[$tombname]" '/^\/dev\/mapper\/tomb/ { if($7==tomb) print $1 }'`
if [ "$mounted_tomb" ]; then
_failure "the tomb $tombname is open, to resize it it needs to be close."
fi
# MB to bytes conversion
newtombsize=`expr \( $newtombsize \* 1024 \) \* 1024 2> /dev/null`
if ! [ "$newtombsize" ] ; then
_failure "You must specify the new size of $tombname"
elif [[ $newtombsize != <-> ]]; then
_failure "Size is not an integer"
elif [ "$newtombsize" -le "$oldtombsize" ]; then
_failure "the new size must be greater then old tomb size."
fi
local delta=`expr $newtombsize \- $oldtombsize`
act "Generating ${tombfile} of ${newtombsize}MiB"
xxx "Data dump using ${DD[1]} from /dev/urandom"
${=DD} if=/dev/urandom bs=1048576 count=${tombsize} of="${tmp_resize}"
if [ $? = 0 -a -e "${tmp_resize}" ]; then
xxx "OK: `ls -lh ${tmp_resize}`"
else
_failure "Error creating the extra resize $tmp_resize, operation aborted."
fi
cat "${tmp_resize}" >> "$1"
${=WIPE} "${tmp_resize}"
tombpass=`ask_key_password $tombkey`
{ test $? = 0 } || {
die "No valid password supplied" }
local nstloop=`losetup -f`
if [ $? = 255 ]; then
_failure "too many tomb opened. Please close any of them to open another tomb"
fi
losetup -f "$1"
local mapdate=`date +%s`
local mapper="tomb.${tombname}.${mapdate}.`basename $nstloop`"
get_lukskey "${tombpass}" ${tombkey} | \
cryptsetup --key-file - luksOpen ${nstloop} ${mapper}
unset tombpass
drop_key # cleanup after load_key
if ! [ -r /dev/mapper/${mapper} ]; then
losetup -d ${nstloop}
_failure "failure mounting the encrypted file"
fi
cryptsetup resize "${mapper}"
if [ $? != 0 ]; then
losetup -d ${nstloop}
_failure "cryptsetup failed to resize $mapper"
fi
e2fsck -f /dev/mapper/${mapper}
if [ $? != 0 ]; then
losetup -d ${nstloop}
_failure "e2fsck failed to check $mapper"
fi
resize2fs /dev/mapper/${mapper}
if [ $? != 0 ]; then
losetup -d ${nstloop}
_failure "resize2fs failed to resize $mapper"
fi
sleep 1 # needs to settle a bit
# close and free the loop device
cryptsetup luksClose "${mapper}"
losetup -d ${nstloop}
return 0
}
# }}}
# {{{ Close
umount_tomb() {
local tombs how_many_tombs
local pathmap mapper tombname tombmount loopdev
local ans pidk pname
if [ "$1" = "all" ]; then
mounted_tombs=(`list_tomb_mounts`)
else
mounted_tombs=(`list_tomb_mounts $1`)
fi
{ test ${#mounted_tombs} = 0 } && {
_warning "There is no open tomb to be closed"
return 1 }
{ test ${#mounted_tombs} -gt 1 } && { test "$1" = "" } && {
_warning "Too many tombs mounted, please specify one (see tomb list)"
_warning "or issue the command 'tomb close all' to close them all."
return 1 }
say "Tomb close $1"
for t in ${mounted_tombs}; do
mapper=`basename ${t[(ws:;:)1]}`
tombname=${t[(ws:;:)5]}
tombmount=${t[(ws:;:)2]}
tombfs=${t[(ws:;:)3]}
tombfsopts=${t[(ws:;:)4]}
tombloop=${mapper[(ws:.:)4]}
xxx "name: $tombname"
xxx "mount: $tombmount"
xxx "mapper: $mapper"
{ test -e "$mapper" } && {
_warning "Tomb not found: $1"
_warning "Please specify an existing tomb."
return 0 }
if [ $SLAM ]; then
_success "Slamming tomb $tombname mounted on $tombmount"
_message "Kill all processes busy inside the tomb"
if ! slam_tomb "$tombmount"; then
_warning "Cannot slam the tomb $tombname"
return 1
fi
else
say "Closing tomb $tombname mounted on $tombmount"
fi
# check if there are binded dirs and close them
bind_tombs=(`list_tomb_binds $tombname`)
for b in ${bind_tombs}; do
bind_mapper="${b[(ws:;:)1]}"
bind_mount="${b[(ws:;:)2]}"
_message "closing tomb bind hook: $bind_mount"
umount $bind_mount
if [[ $? != 0 ]]; then
if [ $SLAM ]; then
_success "Slamming tomb: killing all processes using this hook"
slam_tomb "$bind_mount"
if [[ $? == 1 ]]; then
_warning "Cannot slam the bind hook $bind_mount"
return 1
fi
umount $bind_mount
else
_warning "Tomb bind hook $bind_mount is busy, cannot close tomb."
fi
fi
done
# Execute post-hooks for eventual cleanup
if ! option_is_set -n ; then
exec_safe_post_hooks ${tombmount%%/} close
fi
xxx "performing umount of $tombmount"
umount ${tombmount}
if ! [ $? = 0 ]; then _warning "Tomb is busy, cannot umount!"
else
# this means we used a "default" mount point
{ test "${tombmount}" = "/media/${tombname}.tomb" } && {
rmdir ${tombmount} }
fi
cryptsetup luksClose $mapper
{ test $? = 0 } || {
_warning "error occurred in cryptsetup luksClose ${mapper}"
return 1 }
losetup -d "/dev/$tombloop"
_success "Tomb $tombname closed: your bones will rest in peace."
done # loop across mounted tombs
return 0
}
# Kill all processes using the tomb
slam_tomb() {
# $1 = tomb mount point
if [[ -z `fuser -m "$1" 2> /dev/null` ]]; then
return 0
fi
#Note: shells are NOT killed by INT or TERM, but they are killed by HUP
for s in TERM HUP KILL; do
xxx "Sending $s to processes inside the tomb:"
if option_is_set -D; then
ps -fp `fuser -m /media/a.tomb 2> /dev/null`|
while read line; do
xxx $line
done
fi
fuser -s -m "$1" -k -M -$s
if [[ -z `fuser -m "$1" 2> /dev/null` ]]; then
return 0
fi
if ! option_is_set -f; then
sleep 3
fi
done
return 1
}
# }}} - Tomb close
# {{{ Main routine
main() {
local -A subcommands_opts
### Options configuration
# Hi, dear developer! Are you trying to add a new subcommand, or
# to add some options? Well, keep in mind that an option CAN'T
# have differente meanings/behaviour in different subcommands.
# For example, "-s" means "size" and accept an argument. If you are tempted to add
# an option "-s" (that means, for example "silent", and doesn't accept an argument)
# DON'T DO IT!
# There are two reasons for that:
# I. usability; user expect that "-s" is "size"
# II. Option parsing WILL EXPLODE if you do this kind of bad things
# (it will say "option defined more than once, and he's right")
#
# If you want to use the same option in multiple commands then
# you can only use the non-abbreviated long-option version like:
# -force and NOT -f
main_opts=(q -quiet=q D -debug=D h -help=h v -version=v U: -uid=U G: -gid=G T: -tty=T -no-color -unsecure-dev-mode)
subcommands_opts[__default]=""
subcommands_opts[open]="f n -nohook=n k: -key=k o: -mount-options=o -ignore-swap -sudo-pwd: -tomb-pwd:"
subcommands_opts[mount]=${subcommands_opts[open]}
subcommands_opts[create]="f s: -size=s -force k: -key=k -ignore-swap -kdf: -sudo-pwd: -tomb-pwd: -use-urandom"
subcommands_opts[forge]="f -ignore-swap k: -key=k -kdf: -use-urandom"
subcommands_opts[dig]="f -ignore-swap s: -size=s"
subcommands_opts[lock]="f -force -ignore-swap s: -size=s k: -key=k -sudo-pwd: -tomb-pwd:"
subcommands_opts[passwd]="f -ignore-swap -kdf: -tomb-old-pwd: -tomb-pwd: "
subcommands_opts[close]="-sudo-pwd:"
subcommands_opts[help]=""
subcommands_opts[slam]=""
subcommands_opts[list]="-get-mountpoint"
subcommands_opts[index]=""
subcommands_opts[search]=""
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[resize]="s: -size=s k: -key=k"
subcommands_opts[check]="-ignore-swap"
# subcommands_opts[translate]=""
### 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)
#### detect early: useful for --optiion-parsing
zparseopts -M -D -Adiscardme ${every_opts}
if [[ -n ${(k)discardme[--option-parsing]} ]]; then
echo $1
if [[ -n "$1" ]]; then
return 1
fi
return 0
fi
unset discardme
if ! zparseopts -M -E -D -Adiscardme ${every_opts}; then
error "error parsing"
return 127
fi
unset discardme
subcommand=$1
if [[ -z $subcommand ]]; then
subcommand="__default"
fi
if [[ -z ${(k)subcommands_opts[$subcommand]} ]]; then
_warning "There's no such command \"$subcommand\"."
_failure "Please try -h for help" 127
# die "Subcommand '$subcommand' doesn't exist" 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 there is no option, we don't need parsing
if [[ -n $cmd_opts ]]; then
zparseopts -M -E -D -Aopts ${cmd_opts}
if [[ $? != 0 ]]; then
_warning "Some error occurred during option processing."
die "See \"tomb help\" for more info" 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
die "unrecognized option $arg for subcommand $subcommand" 127
fi
fi
PARAM+=$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
if ! option_is_set --no-color; then
autoload colors; colors
fi
if ! option_is_set --unsecure-dev-mode; then
for opt in --sudo-pwd --tomb-pwd --use-urandom --tomb-old-pwd; do
if option_is_set $opt; then
die "You specified option $opt, which is DANGEROUS and should only be used for testing\nIf you really want so, add --unsecure-dev-mode" 127
fi
done
fi
# when we run as root, we remember the original uid:gid
# to set permissions for the calling user and drop privileges
if option_is_set -U; then _uid="`option_value -U`"; fi
if option_is_set -G; then _gid="`option_value -G`"; fi
if option_is_set -T; then _tty="`option_value -T`"; fi
xxx "Tomb command: $subcommand ${PARAM}"
xxx "caller uid[$_uid] gid[$_gid] tty[$_tty]"
case "$subcommand" in
# new creation in three steps
forge)
check_priv
forge_key ${=PARAM}
;;
dig)
dig_tomb ${=PARAM}
;;
lock)
check_priv
lock_tomb_with_key ${=PARAM}
;;
# backward compat
create)
check_priv
create_tomb ${=PARAM}
;;
mount|open)
check_priv
mount_tomb $PARAM[1] $PARAM[2]
;;
umount|close|slam)
check_priv
[ "$subcommand" = "slam" ] && SLAM=1
umount_tomb $PARAM[1]
;;
passwd)
change_passwd $PARAM[1]
;;
list)
list_tombs $PARAM[1]
;;
index)
index_tombs $PARAM[1]
;;
search)
search_tombs ${=PARAM}
;;
help)
usage
;;
bury)
if [ "$STEGHIDE" = 0 ]; then
_warning "steghide not installed. Cannot bury your key"
return 1
fi
bury_key $PARAM[1] $PARAM[2]
;;
exhume)
if [ "$STEGHIDE" = 0 ]; then
_warning "steghide not installed. Cannot exhume your key"
return 1
fi
exhume_key $PARAM[1] $PARAM[2]
;;
resize)
if [ "$RESIZER" = 0 ]; then
_warning "resize2fs not installed. Cannot resize your tomb."
return 1
fi
check_priv
resize_tomb $PARAM[1]
;;
# internal commands useful to developers
'source') return 0 ;;
install) check_priv ; install_tomb ;;
askpass) ask_password $PARAM[1] $PARAM[2] ;;
mktemp) safe_dir $PARAM[1] ;;
translate) generate_translatable_strings ;;
__default)
cat <<EOF
Tomb $VERSION - a strong and gentle undertaker for your secrets
Copyright (C) 2007-2013 Dyne.org Foundation, License GNU GPL v3+
This is free software: you are free to change and redistribute it
The latest Tomb sourcecode is published on <http://tomb.dyne.org>
EOF
option_is_set -v && {
cat <<EOF
GnuPG available ciphers:
`list_gnupg_ciphers`
EOF
return 0
}
usage
;;
*)
_warning "command \"$subcommand\" not recognized"
_message "try -h for help"
return 1
;;
esac
return $?
}
# }}}
# {{{ Run
check_bin
main $@
ret=$?
if [[ $ret != 0 ]]; then #this "if" seems useless, but avoid source tomb source from exiting
exit $ret
fi
# }}}
# -*- tab-width: 4; indent-tabs-mode:nil; -*-
# vim: set shiftwidth=4 expandtab:
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