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Tomb/tomb
Jaromil f3c18819d2 documentation and test improvements 
also renamed 'backup' command into 'engrave'
2013-06-20 10:26:12 +02:00

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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=1.3.1
DATE="Jun/2013"
TOMBEXEC=$0
typeset -a OLDARGS
for arg in ${argv}; do OLDARGS+=($arg); done
DD="dd"
WIPE="rm -f"
MKFS="mkfs.ext3 -q -F -j -L"
KDF=1
STEGHIDE=1
MKTEMP=1
RESIZER=1
SWISH=1
QRENCODE=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:/usr/local/bin
# }}}
# {{{ 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/tomb.$1.$$.XXXXXXX
else
dir="/dev/shm/tomb.$1.$$.$RANDOM$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/tomb.$1.$$.XXXXXXX || \
print "/dev/shm/tomb.$1.$$.$RANDOM$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 [ $UID != 0 ]; then
xxx "Using sudo for root execution of '${TOMBEXEC} ${(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 2>/dev/null
modprobe dm_crypt 2>/dev/null
return 0
}
# check if a filename is a valid tomb
is_valid_tomb() {
xxx "is_valid_tomb $1"
# argument check
{ test "$1" = "" } && {
_warning "Tomb file is missing from arguments"; return 1 }
# file checks
{ test -r "$1" } || {
_warning "Tomb file not found: $1"; return 1 }
{ test -f "$1" } || {
_warning "Tomb file is not a regular file: $1"; return 1 }
# check file type (if its a Luks fs)
file "$1" | grep -i 'luks encrypted file' >/dev/null
{ test $? = 0 } || {
_warning "File is not a valid tomb: $1"; return 1 }
# check if its already open
tombfile=`basename $1`
tombname=${tombfile%%\.*}
mount -l | grep "${tombfile}.*\[$tombname\]$" > /dev/null
{ test $? = 0 } && {
_warning "Tomb is currently in use: $tombname"; return 1 }
_message "Valid tomb file found: $1"
return 0
}
# }}}
# {{{ Commandline interaction
usage() {
cat <<EOF
Syntax: tomb [options] command [arguments]
Commands:
// Creation:
dig create a new empty TOMB file of --size in MB
forge create a new KEY file and set its password
lock installs a lock on a TOMB to use it with KEY
// Operations on tombs:
open open an existing TOMB
index update the search indexes of tombs
search looks for filenames matching text patterns
list list of open TOMBs and information on them
close close a specific TOMB (or 'all')
slam slam a TOMB killing all programs using it
// Operations on keys:
passwd change the password of a KEY
change change the KEY locking a TOMB (needs old one)
EOF
if [ "$RESIZER" = 1 ]; then
cat <<EOF
resize resize a TOMB to a new --size (can only grow)
EOF
fi
{ test "$QRENCODE" = "1" } && {
cat <<EOF
engrave makes a QR code of a KEY to be saved on paper
EOF
}
if [ "$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)
EOF
{ test "$KDF" = 1 } && {
cat <<EOF
--kdf generate passwords armored against dictionary attacks
EOF
}
cat <<EOF
-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
# check for KDF auxiliary tools
command -v tomb-kdb-pbkdf2 > /dev/null || KDF=0
# check for Swish-E file content indexer
command -v swish-e > /dev/null || SWISH=0
# check for QREncode for paper backups of keys
command -v qrencode > /dev/null || QRENCODE=0
}
# }}} - 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() {
# take the name of a tomb file as argument
# this is used for guessing if the key is nearby
{ test "$1" = "" } || {
tombdir=`dirname $1`
tombfile=`basename $1`
tombname=${tombfile%%\.*}
}
if option_is_set -k ; then
if [[ "`option_value -k`" == "-" ]]; then
xxx "load_key reading from stdin"
# take key from stdin
tombkeydir=`safe_dir load_key`
xxx "tempdir is $tombkeydir"
cat > ${tombkeydir}/stdin.tmp
tombdir=${tombkeydir}
tombfile=stdin.tmp
tombname="stdin"
elif [[ "`option_value -k`" != "" ]]; then
# take key from a file
tombkey=`option_value -k`
tombdir=`dirname $tombkey`
tombfile=`basename $tombkey`
fi
fi
tombkey=${tombdir}/${tombfile}
xxx "load_key: `ls -lh ${tombkey}`"
if [ -r "${tombkey}" ]; then
_message "We'll use this key: ${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`
xxx "ask_key_password takes tombpass from CLI argument: $tombpass"
get_lukskey "$tombpass" ${tombkey} >/dev/null
if [ $? = 0 ]; then
passok=1; _message "Password OK."; fi
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 passnew`
lukskey=`safe_filename passold`
_success "Changing password for $keyfile"
tombpass=`ask_key_password $keyfile`
{ test $? = 0 } || {
die "No valid password supplied" }
get_lukskey "${tombpass}" ${keyfile} > ${lukskey};
drop_key
{
local algo
{ option_is_set -o } && { algopt="`option_value -o`" }
gen_key $lukskey $algopt > ${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() {
xxx "is_valid_key $1"
# argument check
{ test "$1" = "" } && {
_warning "Key file is missing from arguments"; return 1 }
# file checks
{ test -r "$1" } || {
_warning "Key file not found: $1"; return 1 }
{ test -f "$1" } || {
_warning "Key file is not a regular file: $1"; return 1 }
# this header validity check is a virtuosism by Hellekin
[[ `file =(awk '/^-+BEGIN/,0' $1)` =~ PGP ]] && {
_message "Valid key file found: $1"; return 0 }
# if no BEGIN header found then we try to recover it
[[ `file $1 -bi` =~ text/plain ]] && {
_warning "Key data found with missing headers, attempting recovery"
local tmp_keyfix=`safe_filename keyfix`
touch $tmp_keyfix
# make sure KDF header comes first
local header=`grep '^_KDF_' $1`
print "$header" >> $tmp_keyfix
cat $1 | awk '
BEGIN {
print "-----BEGIN PGP MESSAGE-----"
print
}
/^_KDF_/ { next }
{ print $0 }
END {
print "-----END PGP MESSAGE-----"
}' >> ${tmp_keyfix}
mv $tmp_keyfix $1
chown ${_uid}:${_gid} ${1}
chmod 0600 ${1}
return 0
}
_warning "Invalid key format: $1"
return 1
}
# 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 <<<$firstline` in
pbkdf2sha1)
pbkdf2_param=`cut -d_ -f 4- <<<$firstline | tr '_' ' '`
tombpass=$(tomb-kdb-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}"
ret=$?
unset tombpass
else # using status-file in gpg != 1.4.11
res=`safe_filename lukskey`
{ 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' $res > /dev/null
ret=$?; 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
# $2 is the --cipher-algo to use (string taken by GnuPG)
local lukskey="$1"
local algo="${2:-AES256}"
# 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`"
xxx "gen_key takes tombpass from CLI argument: $tombpass"
fi
header=""
{ option_is_set --kdf } && {
# KDF is a new key strenghtening technique against brute forcing
# see: https://github.com/dyne/Tomb/issues/82
itertime="`option_value --kdf`"
{ test "$itertime" = "" } && { itertime=".5" }
_verbose "KDF itertime chosen: $itertime"
# --kdf takes one parameter: iter time (on present machine) in seconds
local -i microseconds
microseconds=$((itertime*1000000))
_verbose "Microseconds: $microseconds"
pbkdf2_salt=`tomb-kdb-pbkdf2-gensalt`
pbkdf2_iter=`tomb-kdb-pbkdf2-getiter $microseconds`
# We use a length of 64bytes = 512bits (more than needed!?)
tombpass=`tomb-kdb-pbkdf2 $pbkdf2_salt $pbkdf2_iter 64 <<<"${tombpass}"`
header="_KDF_pbkdf2sha1_${pbkdf2_salt}_${pbkdf2_iter}_64\n"
}
print -n $header
print "${tombpass}" \
| gpg --openpgp --force-mdc --cipher-algo ${algo} \
--batch --no-options --no-tty --passphrase-fd 0 --status-fd 2 \
-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.
# Requires steghide(1) to be installed
bury_key() {
tombkey="`option_value -k`"
imagefile=$1
{ is_valid_key ${tombkey} } || {
die "Bury failed: not a tomb key $tombkey" }
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 confirm the key password for the encoding"
tombpass=`ask_key_password $tombkey`
{ test $? = 0 } || {
_warning "Wrong password supplied."
die "You shall not bury a key whose password is unknown to you."
}
# we omit armor strings since having them as constants can give
# ground to effective attacks on steganography
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() {
tombkey="`option_value -k`"
imagefile=$1
res=1
file $imagefile | grep JPEG > /dev/null
if [ $? != 0 ]; then
_warning "encode failed: $imagefile is not a jpeg image"
return 1
fi
if [[ -e "$tombkey" ]]; then
_warning "File exists: $tombkey"
{ option_is_set -f } || {
_warning "Make explicit use of --force to overwrite"
die "Refusing to overwrite file. Operation aborted." }
_warning "Use of --force selected: overwriting."
rm -f ${tombkey}
fi
_message "Trying to exhume a key out of image $imagefile"
if option_is_set --tomb-pwd; then
tombpass=`option_value --tomb-pwd`
xxx "ask_key_password takes tombpass from CLI argument: $tombpass"
else
tombpass=`exec_as_user ${TOMBEXEC} askpass "Steg password for ${tombkey}"`
fi
# always steghide required
steghide extract -sf ${imagefile} -p ${tombpass} -xf ${tombkey}
res=$?
unset tombpass
if [ $res = 0 ]; then
_success "${tombkey} succesfully decoded"
return 0
fi
_warning "nothing found in $imagefile"
return 1
}
# Produces a printable image of the key contents so that it can be
# backuped on paper and hidden in books etc.
engrave_key() {
# load key from options
tombkey="`load_key $1`"
{ test $? = 0 } || { die "No key specified." }
keyname=`basename $tombkey`
pngname="$keyname.qr.png"
yes "Rendering a printable QRCode for key: $tombkey"
# we omit armor strings to save space
awk '
/^-----/ {next}
/^Version/ {next}
{print $0}' ${tombkey} | qrencode --size 4 -t PNG --level H \
--casesensitive -o "$pngname"
{ test $? = 0 } || { die "QREncode reported an error." }
yes "Operation successful:"
_message "`ls -lh $pngname`"
_message "`file $pngname`"
}
# }}} - 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() {
xxx "forge_key()"
# can be specified both as simple argument or using -k
local destkey="$1"
{ option_is_set -k } && { destkey="`option_value -k`" }
{ test "$destkey" = "" } && {
_warning "no key name specified for creation"
return 1 }
{ test -r "$destkey" } && {
_warning "Forging this key would overwrite an existing file. Operation aborted."
die "`ls -lh $destkey`" }
# 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
local keytmp=`safe_dir forge`
(( $? )) && 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
local algo
{ option_is_set -o } && { algopt="`option_value -o`" }
algo=${algopt:-AES256}
_message "Commanded to forge key $destkey with cipher algorithm $algo"
local tombkey="$destkey"
_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
local 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 "${keytmp}/tomb.tmp" "$algo" > ${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="$1"
_message "Commanded to lock tomb ${tombfile}"
tombdir=`dirname $1`
tombfile=`basename $1`
tombname=${tombfile%%\.*}
{ 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 ${tombdir}/${tombfile}.key`
{ 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 when locking 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 ${tombkey}"
}
# This function changes the key that locks a tomb
change_tomb_key() {
if ! option_is_set -f && ! option_is_set --ignore-swap; then check_swap; fi
{ option_is_set -k } || { die "Specify the new key with -k" }
newkey="`option_value -k`"
{ is_valid_key "$newkey" } || {
die "New key invalid. Check your usage of the --key option." }
oldkey="$1"
{ is_valid_key "$oldkey" } || {
die "Old key invalid. Check your usage of the first argument." }
{ is_valid_tomb "$2" } || {
die "Specify the name of a tomb as second argument" }
nstloop=`losetup -f`
{ test $? = 255 } && {
die "Too many tombs are open. Please close any of them to proceed." }
losetup -f "$2"
cryptsetup isLuks ${nstloop}
# is it a LUKS encrypted nest? we check one more timesee cryptsetup(1)
{ test $? = 0 } || {
losetup -d "$nstloop"
die "Not a valid LUKS encrypted volume: $2" }
# we have everything, prepare to mount
yes "Changing lock on tomb $tombname"
_message "old key: $oldkey"
_message "new key: $newkey"
# render the mapper
mapdate=`date +%s`
# save date of mount in minutes since 1970
mapper="tomb.${tombname}.${mapdate}.`basename $nstloop`"
# load the new key from the -k option
tombkey=`load_key`
{ test $? = 0 } || {
die "Aborting operations: error loading new key $tombkey" }
newkeypass=`ask_key_password $tombkey`
{ test $? = 0 } || {
die "No valid password supplied for the new key" }
newkeyfile="`safe_filename newkey`"
get_lukskey "$newkeypass" "$newkey" > $newkeyfile
# load the old key
oldkeypass="`ask_key_password $oldkey`"
{ test $? = 0 } || {
die "No valid password supplied for the old key" }
# luksOpen the tomb (not really mounting, just on the loopback)
get_lukskey "$oldkeypass" "$oldkey" | \
cryptsetup --key-file - luksOpen ${nstloop} ${mapper}
{ test $? = 0 } || {
losetup -d "$nstloop"
die "Unexpected error in luksOpen." }
get_lukskey "$oldkeypass" "$oldkey" | \
cryptsetup --key-file - luksChangeKey "$nstloop" "$newkeyfile"
{ test $? = 0 } || {
losetup -d "$nstloop"
die "Unexpected error in luksChangeKey." }
cryptsetup luksClose "${mapper}"
{ test $? = 0 } || {
losetup -d "$nstloop"
die "Unexpected error in luksClose." }
drop_key
unset tombpass
${=WIPE} "$newkeyfile"
losetup -d ${nstloop}
yes "Succesfully changed key for tomb: $2"
_message "The new key is: $newkey"
return 0
}
# backward compatibility
create_tomb() {
xxx "create_tomb(): ${=@} ${=OLDARGS}"
if ! [ $1 ]; then
_warning "no tomb name specified for creation"
return 1
fi
{ test -r "$1" } && {
_warning "Creating this tomb would overwrite an existing file. Operation aborted."
die "`ls -lh $1`" }
{ 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
${TOMBEXEC} dig ${=PARAM}
${TOMBEXEC} forge ${tombdir}/${tombfile}.key
{ test $? = 0 } || { die "Failed to forge key, operation aborted." }
${TOMBEXEC} lock ${tombdir}/${tombfile} -k ${tombdir}/${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 ${tombdir}/${tombfile}.key`
{ 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 0
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"
losetup -d ${nstloop}
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 } || {
losetup -d ${nstloop}
die "No valid password supplied" }
get_lukskey "${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
# $1 is optional, to specify a tomb
index_tombs() {
{ command -v updatedb > /dev/null } || {
die "Cannot index tombs on this system: updatedb (mlocate) not installed" }
updatedbver=`updatedb --version | grep '^updatedb'`
[[ "$updatedbver" =~ "GNU findutils" ]] && {
_warning "Cannot use GNU findutils for index/search commands" }
[[ "$updatedbver" =~ "mlocate" ]] || {
die "Index command needs 'mlocate' to be installed." }
xxx "$updatedbver"
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"
# start the LibreOffice document converter if installed
{ command -v unoconv >/dev/null } && {
unoconv -l 2>/dev/null &
xxx "unoconv listener launched"
sleep 1 }
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 filenames..."
updatedb -l 0 -o ${tombmount}/.updatedb -U ${tombmount}
# here we use swish to index file contents
{ test $SWISH = 1 } && {
say "indexing $tombname contents..."
swishrc=`safe_filename swish`
cat <<EOF > $swishrc
DefaultContents TXT*
FileFilter .pdf pdftotext "'%p' -"
FileFilterMatch unoconv "-d spreadsheet -f csv --stdout %P" /\.xls.*/
FileFilterMatch unoconv "-d spreadsheet -f csv --stdout %P" /\.xlt.*/
FileFilter .ods unoconv "-d spreadsheet -f csv --stdout %P"
FileFilter .ots unoconv "-d spreadsheet -f csv --stdout %P"
FileFilter .dbf unoconv "-d spreadsheet -f csv --stdout %P"
FileFilter .dif unoconv "-d spreadsheet -f csv --stdout %P"
FileFilter .uos unoconv "-d spreadsheet -f csv --stdout %P"
FileFilter .sxc unoconv "-d spreadsheet -f csv --stdout %P"
FileFilterMatch unoconv "-d document -f txt --stdout %P" /\.doc.*/
FileFilterMatch unoconv "-d document -f txt --stdout %P" /\.odt.*/
FileFilterMatch unoconv "-d document -f txt --stdout %P" /\.rtf.*/
IndexContents HTML* .htm .html .shtml
IndexContents XML* .xml
IndexDir $tombmount
IndexFile $tombmount/.swish
EOF
xxx "Using swish-e to create index"
swish-e -c $swishrc -S fs -v3
rm -f $swishrc
}
say "search index updated"
done
}
search_tombs() {
{ command -v locate > /dev/null } || {
die "Cannot index tombs on this system: updatedb (mlocate) not installed" }
updatedbver=`updatedb --version | grep '^updatedb'`
[[ "$updatedbver" =~ "GNU findutils" ]] && {
_warning "Cannot use GNU findutils for index/search commands" }
[[ "$updatedbver" =~ "mlocate" ]] || {
die "Index command needs 'mlocate' to be installed." }
xxx "$updatedbver"
# list all open tombs
mounted_tombs=(`list_tomb_mounts`)
if [ ${#mounted_tombs} = 0 ]; then
die "I can't see any open tomb, may they all rest in peace."; fi
yes "Searching for: $fg_bold[white]${(f)@}$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
# use mlocate to search hits on filenames
say "Searching filenames in tomb $tombname"
locate -d ${tombmount}/.updatedb -e -i "${(f)@}"
say "Matches found: `locate -d ${tombmount}/.updatedb -e -i -c ${(f)@}`"
# use swish-e to search over contents
{ test $SWISH = 1 } && { test -r $tombmount/.swish } && {
say "Searching contents in tomb $tombname"
swish-search -w ${=@} -f $tombmount/.swish -H0 }
else
no "skipping tomb $tombname: not indexed"
no "run 'tomb index' to create indexes"
fi
done
say "Search completed."
}
# }}} - 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
tombdir=`dirname $1`
tombfile=`basename $1`
tombname=${tombfile%%\.*}
# load key from options or file
tombkey=`load_key ${tombdir}/${tombfile}`
{ test $? = 0 } || {
die "Aborting operations: error loading key $tombkey" }
# make sure to call drop_key later
local tmp_resize=`safe_filename resize`
local newtombsize=$opts[-s]
local oldtombsize=$(( `stat -c %s "$1" 2>/dev/null` / 1048576 ))
local mounted_tomb=`mount -l |
awk -vtomb="[$tombname]" '/^\/dev\/mapper\/tomb/ { if($7==tomb) print $1 }'`
if [ "$mounted_tomb" ]; then
_failure "the tomb $tombname is open, to resize it it needs to be close."
fi
if ! [ "$newtombsize" ] ; then
_failure "You must specify the new size of $tombname"
elif [[ $newtombsize != <-> ]]; then
_failure "Size is not an integer"
elif [ "$newtombsize" -le "$oldtombsize" ]; then
_failure "the new size must be greater then old tomb size."
fi
delta="$(( $newtombsize - $oldtombsize ))"
act "Generating ${tombfile} of ${newtombsize}MiB"
xxx "Data dump using ${DD[1]} from /dev/urandom"
${=DD} if=/dev/urandom bs=1048576 count=${delta} 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}" >> ${tombdir}/${tombfile}
rm "${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 ${tombdir}/${tombfile}
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 "$1" 2> /dev/null` ]]; then
return 0
fi
if ! option_is_set -f; then
sleep 3
fi
done
return 1
}
# }}} - Tomb close
# {{{ Main routine
main() {
local -A subcommands_opts
### Options configuration
# Hi, dear developer! Are you trying to add a new subcommand, or
# to add some options? Well, keep in mind that an option CAN'T
# have differente meanings/behaviour in different subcommands.
# For example, "-s" means "size" and accept an argument. If you are tempted to add
# an option "-s" (that means, for example "silent", and doesn't accept an argument)
# DON'T DO IT!
# There are two reasons for that:
# I. usability; user expect that "-s" is "size"
# II. Option parsing WILL EXPLODE if you do this kind of bad things
# (it will say "option defined more than once, and he's right")
#
# If you want to use the same option in multiple commands then
# you can only use the non-abbreviated long-option version like:
# -force and NOT -f
main_opts=(q -quiet=q D -debug=D h -help=h v -version=v U: -uid=U G: -gid=G T: -tty=T -no-color -unsecure-dev-mode)
subcommands_opts[__default]=""
subcommands_opts[open]="f -force n -nohook=n k: -key=k o: -ignore-swap -sudo-pwd: -tomb-pwd: "
subcommands_opts[mount]=${subcommands_opts[open]}
subcommands_opts[create]="" # deprecated, will issue warning
subcommands_opts[forge]="f -force -ignore-swap k: -key=k -kdf: o: -tomb-pwd: -use-urandom "
subcommands_opts[dig]="f -force -ignore-swap s: -size=s "
subcommands_opts[lock]="f -force -ignore-swap k: -key=k o: -sudo-pwd: -tomb-pwd: "
subcommands_opts[change]="f -force -ignore-swap k: -key=k -sudo-pwd: -tomb-pwd: "
subcommands_opts[engrave]="k: -key=k "
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]="f -force k: -key=k -tomb-pwd: "
subcommands_opts[exhume]="f -force k: -key=k -tomb-pwd: "
# subcommands_opts[decompose]=""
# subcommands_opts[recompose]=""
# subcommands_opts[install]=""
subcommands_opts[askpass]=""
subcommands_opts[mktemp]=""
subcommands_opts[source]=""
subcommands_opts[resize]="f -force -ignore-swap s: -size=s k: -key=k -tomb-pwd: "
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
die "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}
;;
change)
check_priv
change_tomb_key ${=PARAM}
;;
engrave)
{ test "$QRENCODE" = 0 } && {
die "QREncode not installed: cannot engrave keys on paper." }
engrave_key ${=PARAM}
;;
# backward compat
create)
_warning "The create command is deprecated, please use dig, forge and lock instead."
_warning "For more informations see Tomb's manual page (man tomb)."
;;
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 ${=PARAM}
;;
help)
usage
;;
bury)
{ test "$STEGHIDE" = 0 } && {
die "Steghide not installed: cannot bury keys into images." }
bury_key $PARAM[1]
;;
exhume)
{ test "$STEGHIDE" = 0 } && {
die "Steghide not installed: cannot exhume keys from images." }
exhume_key $PARAM[1]
;;
resize)
{ test "$RESIZER" = 0 } && {
die "Resize2fs not installed: cannot resize tombs." }
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 $VERSION - a strong and gentle undertaker for your secrets
Copyright (C) 2007-2013 Dyne.org Foundation, License GNU GPL v3+
This is free software: you are free to change and redistribute it
The latest Tomb sourcecode is published on <http://tomb.dyne.org>
EOF
option_is_set -v && {
cat <<EOF
This source code is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Please refer to the GNU Public License for more details.
System utils:
`sudo -V | head -n1`
`cryptsetup --version`
`pinentry --version`
`gpg --version | head -n1` - key forging algorithms (GnuPG symmetric ciphers):
`list_gnupg_ciphers`
EOF
return 0
}
usage
;;
*)
_warning "command \"$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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