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Tomb/tomb
Narrat 0b25ba6d68 umount_tomb: avoid double execution of list_tomb_binds() 
Especially directly after each other.
2024-08-31 19:07:09 +02:00

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#!/usr/bin/env zsh
#
# Tomb, the Crypto Undertaker
#
# A commandline tool to easily operate encryption of secret data
#
# {{{ License
# Copyright (C) 2007-2024 Dyne.org Foundation
#
# Tomb is designed, written and maintained by Denis Roio <jaromil@dyne.org>
#
# Please refer to the AUTHORS file for more information.
#
# 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, , see <https://www.gnu.org/licenses/>.
# }}} - License
# {{{ Global variables
typeset VERSION="2.11.0"
typeset DATE="Jul/2024"
typeset TOMBEXEC=$0
typeset TMPDIR=${${TMPPREFIX%/*}:-/tmp}
# TODO: configure which tmp dir to use from a cli flag
# Tomb is using some global variables set by the shell:
# TMPPREFIX, UID, GID, PATH, TTY, USERNAME
# You can grep 'global variable' to see where they are used.
# Keep a reference of the original command line arguments
typeset -a OLDARGS
for arg in "${(@)argv}"; do OLDARGS+=("$arg"); done
# Special command requirements
typeset -a DD WIPE PINENTRY SUDO
DD=(dd)
WIPE=(rm -f)
# load zsh regex module
zmodload zsh/mapfile
zmodload -F zsh/stat b:zstat
# make sure variables aren't exported
unsetopt allexport
# Flag optional commands if available (see _ensure_dependencies())
typeset -i KDF=1
typeset -i STEGHIDE=1
typeset -i CLOAKIFY=1
typeset -i DECLOAKIFY=1
typeset -i SPHINX=1
typeset -i RESIZER=1
typeset -i RECOLL=1
typeset -i QRENCODE=1
# Default mount options
typeset MOUNTOPTS="rw,noatime,nodev"
# Makes glob matching case insensitive
unsetopt CASE_MATCH
typeset -AH OPTS # Command line options (see main())
# Command context (see _whoami())
typeset -H _USER # Running username
typeset -Hi _UID # Running user identifier
typeset -Hi _GID # Running user group identifier
typeset -H _TTY # Connected input terminal
# Tomb context (see is_valid_tomb())
typeset -H TOMBPATH # Full path to the tomb
typeset -H TOMBDIR # Directory where the tomb is
typeset -H TOMBFILE # File name of the tomb
typeset -H TOMBNAME # Name of the tomb
# Tomb secrets
typeset -H TOMBKEY # Encrypted key contents (see forge_key(), recover_key())
typeset -H TOMBKEYFILE # Key file (ditto)
typeset -H TOMBSECRET # Raw deciphered key (see forge_key(), gpg_decrypt())
typeset -H TOMBPASSWORD # Raw tomb passphrase (see gen_key(), ask_key_password())
typeset -H TOMBTMP # Filename of secure temp just created (see _tmp_create())
typeset -aH TOMBTMPFILES # Keep track of temporary files
typeset -aH TOMBLOOPDEVS # Keep track of used loop devices
typeset -A TOMBFILESSTAT # Keep track of access date attributes
typeset _MSG_FD_OVERRIDE # if set, _msg will write to this file descriptor
# Make sure sbin is in PATH (man zshparam)
path+=( /sbin /usr/sbin )
# For gettext
export TEXTDOMAIN=tomb
# }}}
# {{{ Safety functions
# Wrap sudo with a more visible message or apply user-supplied alternative to sudo
_sudo() {
if option_is_set --sudo; then
pescmd=`option_value --sudo`
case `basename $pescmd` in
"doas"|"sup"|"sud"|"pkexec")
command -v $pescmd > /dev/null || _failure "$pescmd executable not found"
_verbose "Super user execution using $pescmd"
${pescmd} ${@}
return $?
;;
"skip"|"none")
_verbose "Super user execution skipped (SUID caller)"
${@}
return $?
;;
*)
_failure "Super user execution not supported: ::1 sudo::" "`option_value --sudo`"
;;
esac
else
if [[ "`id -u`" = "0" ]]; then
_verbose "Super user execution skipped (SUID caller)"
${@}
return $?
elif command -v sudo 1>/dev/null 2>/dev/null; then
local msg="[sudo] Enter password for user ::1 user:: to gain superuser privileges"
command -v gettext 1>/dev/null 2>/dev/null && msg="$(gettext -s "$msg")"
msg=${(S)msg//::1*::/$USER}
[[ -n "$SUDO_ASKPASS" ]] && local sudo_askpass="--askpass"
sudo $sudo_askpass -p "
$msg
" ${@}
return $?
elif command -v doas 1>/dev/null 2>/dev/null; then
local msg="Enter password for user ::1 user:: to gain superuser privileges"
command -v gettext 1>/dev/null 2>/dev/null && msg="$(gettext -s "$msg")"
msg=${(S)msg//::1*::/$USER}
doas ${@}
return $?
else
_failure "No way found to escalate privileges to super user."
fi
fi
}
# Cleanup anything sensitive before exiting.
_endgame() {
option_value_contains -o ro || {
# Restore access time of sensitive files
[[ -z $TOMBFILESSTAT ]] || _restore_stat
}
# Prepare some random material to overwrite vars
local rr="$RANDOM"
while [[ ${#rr} -lt 500 ]]; do
rr+="$RANDOM"
done
# Ensure no information is left in unallocated memory
TOMBPATH="$rr"; unset TOMBPATH
TOMBDIR="$rr"; unset TOMBDIR
TOMBFILE="$rr"; unset TOMBFILE
TOMBNAME="$rr"; unset TOMBNAME
TOMBKEY="$rr"; unset TOMBKEY
TOMBKEYFILE="$rr"; unset TOMBKEYFILE
TOMBSECRET="$rr"; unset TOMBSECRET
TOMBPASSWORD="$rr"; unset TOMBPASSWORD
# Clear temporary files
for f in $TOMBTMPFILES; do
${=WIPE} "$f"
done
unset TOMBTMPFILES
# Clear information regarding loop devices
# No need for an explicit detach as cryptsetup
# sets the AUTOCLEAR flag
unset TOMBLOOPDEVS
}
# Trap functions for the _endgame event
TRAPINT() { _endgame INT; }
TRAPEXIT() { _endgame EXIT; }
TRAPHUP() { _endgame HUP; }
TRAPQUIT() { _endgame QUIT; }
TRAPABRT() { _endgame ABORT; }
TRAPKILL() { _endgame KILL; }
TRAPPIPE() { _endgame PIPE; }
TRAPTERM() { _endgame TERM; }
TRAPSTOP() { _endgame STOP; }
_is_found() {
# returns 0 if binary is found in path
[[ -z $1 ]] && return 1
command -v "$1" 1>/dev/null 2>/dev/null
return $?
}
# Track acces and modification time of tomb files.
# $1: file to track
# date format: seconds since Epoch
# stat format: <last access>:<last modified>
_track_stat() {
local file="$1"
local stat=$(stat --format="%X:%Y" "$file")
TOMBFILESSTAT+=("$file" "$stat")
}
# Restore files stats
_restore_stat() {
local file stat
for file stat in "${(@kv)TOMBFILESSTAT}"; do
stats=("${(@s.:.)stat}")
_verbose "Restoring access and modification time for ::1 file::" $file
[[ -z "${stats[1]}" ]] || touch -a --date="@${stats[1]}" "$file"
[[ -z "${stats[2]}" ]] || touch -m --date="@${stats[2]}" "$file"
done
}
# Identify the running user
# Set global variables _UID, _GID, _TTY, and _USER, either from the
# command line, -U, -G, -T, respectively, or from the environment.
# Also update USERNAME and HOME to maintain consistency.
_whoami() {
# Set username from UID or environment
_USER=$SUDO_USER
[[ -z $_USER ]] && { _USER=$USERNAME }
[[ -z $_USER ]] && { _USER=$(id -un) }
[[ -z $_USER ]] && {
_failure "Failing to identify the user who is calling us" }
# Get GID from option -G or the environment
option_is_set -G \
&& _GID=$(option_value -G) || _GID=$(id -g $_USER)
# Get UID from option -U or the environment
option_is_set -U \
&& _UID=$(option_value -U) || _UID=$(id -u $_USER)
_verbose "Identified caller: ::1 username:: (::2 UID:::::3 GID::)" $_USER $_UID $_GID
# Update USERNAME accordingly if possible
# [[ $EUID == 0 && $_USER != $USERNAME ]] && {
# _verbose "Updating USERNAME from '::1 USERNAME::' to '::2 _USER::')" $USERNAME $_USER
# USERNAME=$_USER
# }
# Force HOME to _USER's HOME if necessary
local home=`_get_home $_USER`
[[ $home == $HOME ]] || {
_verbose "Updating HOME to match user's: ::1 home:: (was ::2 HOME::)" \
$home $HOME
HOME=$home }
# Get connecting TTY from option -T or the environment
option_is_set -T && _TTY=$(option_value -T)
[[ -z $_TTY ]] && _TTY=$TTY
}
# Provide a random filename in shared memory
_tmp_create() {
[[ -d "$TMPDIR" ]] || {
# we create the tempdir with the sticky bit on
_sudo mkdir -m 1777 "$TMPDIR"
[[ $? == 0 ]] || _failure "Fatal error creating the temporary directory: ::1 temp dir::" "$TMPDIR"
}
# We're going to add one more $RANDOM for each time someone complains
# about this being too weak of a random.
tfile="${TMPDIR}/$RANDOM$RANDOM$RANDOM$RANDOM" # Temporary file
umask 066
[[ $? == 0 ]] || {
_failure "Fatal error setting the permission umask for temporary files" }
[[ -r "$tfile" ]] && {
_failure "Someone is messing up with us trying to hijack temporary files." }
touch "$tfile"
[[ $? == 0 ]] || {
_failure "Fatal error creating a temporary file: ::1 temp file::" "$tfile" }
_verbose "Created tempfile: ::1 temp file::" "$tfile"
TOMBTMP="$tfile"
TOMBTMPFILES+=("$tfile")
return 0
}
# Check if a *block* device is encrypted
# Check if a *block* device is a zram device
# Synopsis: _is_zramswap /path/to/block/device
# Return 0 if it is a zramswap
# Return 1 if it is not a zramswap
_is_zramswap() {
local b=$1 # Path to a block device
# check if device b is a zram block device
zramctl --raw -o NAME | grep "^$b" >/dev/null
return $?
}
# Check if a zram device uses the writeback feature that writes data onto a disk
# Synopsis: _zramswap_uses_writeback /path/to/block/device
# Return 0 if the zram device writes to disk
# Return 1 if the zram device does not write to disk
_zramswap_uses_writeback() {
local b=$1 # Path to a block device
local m="" # major device number
local n="" # minor device number
read n m < <(stat -c '%T %t' $b) # get major and minor device number in hex
printf -v m %d $((16#$m)) # get major device number in decimal
printf -v n %d $((16#$n)) # get minor device number in decimal
if grep '^none$' "/sys/dev/block/$m:$n/backing_dev" > /dev/null; then
return 1
fi
return 0
}
# Check if a *block* device is a zram device
# Synopsis: _is_zramswap /path/to/block/device
# Return 0 if it is a zramswap
# Return 1 if it is not a zramswap
_is_zramswap() {
local b=$1 # Path to a block device
zramctl --raw -o NAME | grep "^$b" >/dev/null
# @todo How to do this without zramctl?
# - device node major is dynamically allocated to zram0
# - in /sys/ there seems to be no file identifying a zram device
return $?
}
# Check if a zram device uses the writeback feature that writes data onto a disk
# Synopsis: _zramswap_uses_writeback /path/to/block/device
# Return 0 if the zram device writes to disk
# Return 1 if the zram device does not write to disk
_zramswap_uses_writeback() {
local b=$1 # Path to a block device
local m="" # major device number
local n="" # minor device number
read n m < <(stat -c '%T %t' $b) # get major and minor device number in hex
printf -v m %d $((16#$m)) # get major device number in decimal
printf -v n %d $((16#$n)) # get minor device number in decimal
if grep '^none$' "/sys/dev/block/$m:$n/backing_dev" > /dev/null; then
return 1
fi
return 0
}
# Synopsis: _is_encrypted_block /path/to/block/device
# Return 0 if it is an encrypted block device
_is_encrypted_block() {
local b=$1 # Path to a block device
local s="" # lsblk option -s (if available)
# Issue #163
# lsblk --inverse appeared in util-linux 2.22
# but --version is not consistent...
lsblk --help | grep -Fq -- --inverse
[[ $? -eq 0 ]] && s="--inverse"
_sudo lsblk $s -o type -n $b 2>/dev/null \
| egrep -q '^crypt$'
return $?
}
# Check if swap is activated
# Return 0 if NO swap is used, 1 if swap is used.
# Return 1 if any of the swaps is not encrypted.
# Return 2 if swap(s) is(are) used, but ALL encrypted or zramswap without writeback to disk.
# Use _check_swap in functions. It will call this function and
# exit if unsafe swap is present.
_ensure_safe_swap() {
local -i r=1 # Return code: 0 no swap, 1 unsafe swap, 2 encrypted
local -a swaps # List of swap partitions
local bone is_crypt
swaps="$(awk '/^\// { print $1 }' /proc/swaps 2>/dev/null)"
[[ -z "$swaps" ]] && return 0 # No swap partition is active
_message "An active swap partition is detected..."
for s in $=swaps; do
if _is_encrypted_block $s; then
r=2;
elif _is_zramswap $s; then
if _zramswap_uses_writeback $s; then
# We're dealing with unencrypted stuff written to disk.
# Maybe it lives on an encrypted filesystem anyway.
# @todo verify it's actually written to an encrypted FS
# Well, no: bail out.
_message "Found zramswap with writeback enabled."
r=1; break;
else
_message "Found zramswap without writeback to disk."
r=2
fi
else
# We're dealing with unencrypted stuff written to disk.
# Maybe it lives on an encrypted filesystem anyway.
# @todo: verify it's actually on an encrypted FS (see #163 and !189)
# Well, no: bail out.
r=1; break;
fi
done
if [[ $r -eq 2 ]]; then
_success "The undertaker found that all swap partitions are encrypted. Good."
else
_warning "This poses a security risk."
_warning "You can deactivate all swap partitions using the command:"
_warning " swapoff -a"
_warning "[#163] I may not detect plain swaps on an encrypted volume."
_warning "But if you want to proceed like this, use the -f (force) flag."
fi
return $r
}
# Wrapper to allow encrypted swap and remind the user about possible
# data leaks to disk if swap is on, which shouldn't be ignored. It could
# be run once in main(), but as swap evolves, it's better to run it
# whenever swap may be needed.
# Exit if unencrypted swap is active on the system.
_check_swap() {
if ! option_is_set -f && ! option_is_set --ignore-swap; then
_ensure_safe_swap
case $? in
0|2) # No, or encrypted swap
return 0
;;
*) # Unencrypted swap
_failure "Operation aborted."
;;
esac
fi
}
pinentry_assuan_getpass() {
# simply prints out commands for pinentry's stdin to activate the
# password dialog
cat <<EOF
OPTION ttyname=$TTY
OPTION lc-ctype=$LANG
SETTITLE $title
SETDESC $description
SETPROMPT Password:
GETPIN
EOF
}
# Ask user for a password
# Wraps around the pinentry command, from the GnuPG project, as it
# provides better security and conveniently use the right toolkit.
ask_password() {
local description="$1"
local title="${2:-Enter tomb password.}"
local output
local password
local gtkrc
local theme
local pass_asked
# Distributions have broken wrappers for pinentry: they do
# implement fallback, but they disrupt the output somehow. We are
# better off relying on less intermediaries, so we implement our
# own fallback mechanisms. Pinentry supported: curses, gtk-2, qt4, qt5
# and x11.
# make sure LANG is set, default to C
LANG=${LANG:-C}
_verbose "asking password with tty=$TTY lc-ctype=$LANG"
pass_asked=0
if [[ ! -z $WAYLAND_DISPLAY ]]; then
_verbose "wayland display detected"
_is_found "pinentry-gnome3" && {
_verbose "using pinentry-gnome3 on wayland"
output=$(pinentry_assuan_getpass | pinentry-gnome3)
pass_asked=1
}
fi
if [[ ! -z $DISPLAY ]] && [[ $pass_asked == 0 ]]; then
_verbose "X11 display detected"
if _is_found "pinentry-gtk-2"; then
_verbose "using pinentry-gtk2"
output=$(pinentry_assuan_getpass | pinentry-gtk-2)
pass_asked=1
elif _is_found "pinentry-x11"; then
_verbose "using pinentry-x11"
output=$(pinentry_assuan_getpass | pinentry-x11)
pass_asked=1
elif _is_found "pinentry-gnome3"; then
_verbose "using pinentry-gnome3 on X11"
output=$(pinentry_assuan_getpass | pinentry-gnome3)
pass_asked=1
elif _is_found "pinentry-qt5"; then
_verbose "using pinentry-qt5"
output=$(pinentry_assuan_getpass | pinentry-qt5)
pass_asked=1
elif _is_found "pinentry-qt4"; then
_verbose "using pinentry-qt4"
output=$(pinentry_assuan_getpass | pinentry-qt4)
pass_asked=1
fi
fi
if [[ $pass_asked == 0 ]]; then
_verbose "no display detected"
if _is_found "pinentry-curses"; then
_verbose "using pinentry-curses with no display"
output=$(pinentry_assuan_getpass | pinentry-curses)
pass_asked=1
elif _is_found "pinentry-tty"; then
_verbose "using pinentry-tty with no display"
output=$(pinentry_assuan_getpass | pinentry-tty)
pass_asked=1
else
# TODO: fallback to asking password using read
_failure "Cannot find any pinentry and no DISPLAY detected."
fi
fi
[[ $pass_asked == 0 ]] &&
_failure "Cannot find any pinentry and no DISPLAY detected."
# parse the pinentry output
local pinentry_error
for i in ${(f)output}; do
[[ "$i" =~ "^ERR.*" ]] && {
pinentry_error="${i[(w)3]}"
}
# here the password is found
[[ "$i" =~ "^D .*" ]] && password="${i##D }";
done
[[ ! -z $pinentry_error ]] && [[ -z $password ]] && {
_warning "Pinentry error: ::1 error::" ${pinentry_error}
print "canceled"
return 1
}
# if sphinx mode is chosen, use the provided input
# as master password to retrieve the actual password
if option_is_set --sphx-user || option_is_set --sphx-host; then
password=$(sphinx_get_password "$password")
fi
[[ -z $password ]] && {
_warning "Empty password"
print "empty"
return 1
}
print "$password"
return 0
}
# Retrieve PASSWORD from sphinx
# $1 MASTER password for the password store
# requires --sphx-host and --sphx-user flags to be set
sphinx_get_password() {
local errorfile
local password
if option_is_set --sphx-user && option_is_set --sphx-host; then
# value error in sphinx doesn't set exit code
# using tempfile as a workaround to notice the error
errorfile=$(mktemp /tmp/tomb_error.XXXXXXXXX)
password=$(echo "$1" | sphinx get $(option_value --sphx-user) $(option_value --sphx-host) 2>$errorfile)
if ! grep -q "ValueError: fail" $errorfile ; then
echo "$password"
rm $errorfile
return 0
else
_warning "sphinx returns error: ::1 error::" $(cat $errorfile)
rm $errorfile
_failure "Failed to retrieve actual password with sphinx."
fi
else
_failure "Both host and user have to be set to use sphinx"
fi
}
# Create PASSWORD in sphinx
# $1 MASTER password for the password store
# requires --sphx-host and --sphx-user flags to be set
sphinx_set_password() {
local errorfile
local password
if option_is_set --sphx-user && option_is_set --sphx-host; then
# value error in sphinx doesn't set exit code
# using tempfile as a workaround to notice the error
errorfile=$(mktemp /tmp/tomb_error.XXXXXXXXX)
# check first if this host/user combination exists in store
# if yes, there is no need to make a call to create
password=$(echo "$1" | sphinx get $(option_value --sphx-user) $(option_value --sphx-host) 2>$errorfile)
if ! grep -q "error: sphinx protocol failure" $errorfile ; then
echo "$password"
rm $errorfile
return 0
fi
# no such host/user combination in store, create one
password=$(echo "$1" | sphinx create $(option_value --sphx-user) $(option_value --sphx-host) ulsd 0 2>$errorfile)
if ! grep -q "error: sphinx protocol failure" $errorfile ; then
echo "$password"
rm $errorfile
return 0
else
_warning "sphinx returns error: ::1 error::" $(cat $errorfile)
rm $errorfile
_failure "Failed to create password with sphinx"
fi
else
_failure "Both host and user have to be set to use sphinx"
fi
}
# Check if a filename is a valid tomb
is_valid_tomb() {
_verbose "is_valid_tomb ::1 tomb file::" $1
# First argument must be the path to a tomb
[[ ! -z $1 ]] || _failure "Tomb file is missing from arguments."
local _fail=0
# Tomb file must be a readable, writable, non-empty regular file.
# If passed the "ro" mount option, the writable check is skipped.
option_value_contains -o ro || {
[[ ! -w "$1" ]] && {
_warning "Tomb file is not writable: ::1 tomb file::" $1
_fail=1
}
}
_verbose "tomb file is readable"
[[ ! -f "$1" ]] && {
_warning "Tomb file is not a regular file: ::1 tomb file::" $1
_fail=1
}
_verbose "tomb file is a regular file"
[[ ! -s "$1" ]] && {
_warning "Tomb file is empty (zero length): ::1 tomb file::" $1
_fail=1
}
_verbose "tomb file is not empty"
[[ $_fail == 1 ]] && {
_failure "Tomb command failed: ::1 command name::" $subcommand
}
# Tomb file may be a LUKS FS (or we are creating it)
[[ "`file $1`" =~ "luks encrypted file" ]] || {
_message "File is not yet a tomb: ::1 tomb file::" $1 }
# We set global variables
typeset -g TOMBPATH TOMBDIR TOMBFILE TOMBNAME TOMBMAPPER
TOMBPATH="$1"
TOMBDIR=$(dirname $TOMBPATH)
TOMBFILE=$(basename $TOMBPATH)
# The tomb name is TOMBFILE without an extension and underscores instead of spaces (for mount and cryptsetup)
# It can start with dots: ..foo bar baz.tomb -> ..foo_bar_baz
TOMBNAME=${${TOMBFILE// /_}%.*}
# use the entire filename if the previous transformation returns
# an empty string. This handles the corner case of tomb being
# hidden files (starting with a dot) and have no extension (only
# one dot in string)
TOMBNAME=${TOMBNAME:-${TOMBFILE}}
[[ -z $TOMBNAME ]] &&
_failure "Tomb won't work without a TOMBNAME."
# checks if Tomb already mounted (or we cannot alter it)
local maphash=`realpath $TOMBPATH | sha256sum`
lo_check # fills TOMBLOOP with next loop if available
TOMBMAPPER="tomb.$TOMBNAME.${maphash[(w)1]}.`basename $TOMBLOOP`"
local mounted_tombs=(`list_tomb_mounts`)
local usedmapper
for t in ${mounted_tombs}; do
usedmapper=`basename "${t[(ws:;:)1]}"`
[[ "${usedmapper%.*}" == "${TOMBMAPPER%.*}" ]] &&
_failure "Tomb file already in use: ::1 tombname::" $TOMBPATH
done
_verbose "Mapper: ::1 mapper::" $TOMBMAPPER
_verbose "tomb file is not currently in use"
_message "Valid tomb file found: ::1 tomb path::" $TOMBPATH
return 0
}
# $1 is the tomb file which needs a loop device
lo_check() {
tpath="$1"
# check if we have support for loop mounting
TOMBLOOP=`_sudo losetup -f`
[[ $? = 0 ]] || {
_warning "Loop mount of volumes is not possible on this machine, this error"
_warning "often occurs on VPS and kernels that don't provide the loop module."
_warning "It is impossible to use Tomb on this machine under these conditions."
_failure "Operation aborted."
}
[[ "$tpath" == "" ]] && return 0
TOMBLOOPDEVS+=("$TOMBLOOP") # add to array of lodevs used
return 0
}
# eventually used for debugging
dump_secrets() {
print "TOMBPATH: $TOMBPATH"
print "TOMBNAME: $TOMBNAME"
print "TOMBKEY len: ${#TOMBKEY}"
print "TOMBKEYFILE: $TOMBKEYFILE"
print "TOMBSECRET len: ${#TOMBSECRET}"
print "TOMBPASSWORD: $TOMBPASSWORD"
print "TOMBTMPFILES: ${(@)TOMBTMPFILES}"
print "TOMBLOOPDEVS: ${(@)TOMBLOOPDEVS}"
}
# }}}
# {{{ Commandline interaction
usage() {
_print "Syntax: tomb [options] command [arguments]"
echo
_print "Commands:"
echo
_print " // Creation:"
_print " dig create a new empty TOMB file of size -s in MiB"
_print " forge create a new KEY file and set its password"
_print " lock installs a lock on a TOMB to use it with KEY"
echo
_print " // Operations on tombs:"
_print " open open an existing TOMB (-k KEY file or - for stdin)"
_print " index update the search indexes of tombs"
_print " search looks for filenames matching text patterns"
_print " list list of open TOMBs and information on them"
_print " ps list of running processes inside open TOMBs"
_print " close close a specific TOMB (or 'all')"
_print " slam slam a TOMB killing all programs using it"
[[ $RESIZER == 1 ]] && {
_print " resize resize a TOMB to a new size -s (can only grow)"
}
echo
_print " // Operations on keys:"
_print " passwd change the password of a KEY (needs old pass)"
_print " setkey change the KEY locking a TOMB (needs old key and pass)"
echo
[[ $QRENCODE == 1 ]] && {
_print " // Backup on paper:"
_print " engrave makes a QR code of a KEY to be saved on paper"
echo
}
[[ $STEGHIDE == 1 || $CLOAKIFY == 1 || $DECLOAKIFY == 1 ]] && {
_print " // Steganography:"
[[ $STEGHIDE == 1 ]] && {
_print " bury hide a KEY inside a JPEG image (for use with -k)"
_print " exhume extract a KEY from a JPEG image (prints to stdout)"
}
[[ $CLOAKIFY == 1 ]] && {
_print " cloak transform a KEY into TEXT using CIPHER (for use with -k)"
}
[[ $DECLOAKIFY == 1 ]] && {
_print " uncloak extract a KEY from a TEXT using CIPHER (prints to stdout)"
}
echo
}
_print "Options:"
echo
_print " -s size of the tomb file when creating/resizing one (in MiB)"
_print " -k path to the key to be used ('-k -' to read from stdin)"
_print " -n don't launch the execution hooks found in tomb"
_print " -p preserve the ownership of all files in tomb"
_print " -o options passed to commands: open, lock, forge (see man)"
_print " -f force operation (i.e. even if swap is active)"
_print " -g use a GnuPG key to encrypt a tomb key"
_print " -r provide GnuPG recipients (separated by comma)"
_print " -R provide GnuPG hidden recipients (separated by comma)"
_print " --sudo super user exec alternative to sudo (doas or none)"
[[ $SPHINX == 1 ]] && {
_print " --sphx-user user associated with the key (for use with pitchforkedsphinx)"
_print " --sphx-host host associated with the key (for use with pitchforkedsphinx)"
}
[[ $KDF == 1 ]] && {
_print " --kdf forge keys armored against dictionary attacks"
}
echo
_print " -h print this help"
_print " -v print version, license and list of available ciphers"
_print " -q run quietly without printing informations"
_print " -D print debugging information at runtime"
echo
_print "For more information on Tomb read the manual: man tomb"
_print "Please report bugs on <http://github.com/dyne/tomb/issues>."
}
# Check whether a commandline option is set.
#
# Synopsis: option_is_set -flag [out]
#
# First argument is the commandline flag (e.g., "-s").
# If the second argument is present and set to 'out', print out the
# result: either 'set' or 'unset' (useful for if conditions).
#
# Return 0 if is set, 1 otherwise
option_is_set() {
local -i r # the return code (0 = set, 1 = unset)
[[ -n ${(k)OPTS[$1]} ]];
r=$?
[[ $2 == "out" ]] && {
[[ $r == 0 ]] && { print 'set' } || { print 'unset' }
}
return $r;
}
# Print the option value matching the given flag
# Unique argument is the commandline flag (e.g., "-s").
option_value() {
print -n - "${OPTS[$1]}"
}
# check if the option value contains a string between commas
option_value_contains() {
local opt="${OPTS[$1]}"
local str="$2"
for i in ${(s:,:)opt}; do
[[ "$i" == "$2" ]] && return 0
done
return 1
}
# Messaging function with pretty coloring
function _msg() {
local msg="$2"
local i
command -v gettext 1>/dev/null 2>/dev/null && msg="$(gettext -s "$2")"
for i in {3..${#}}; do
msg=${(S)msg//::$(($i - 2))*::/$*[$i]}
done
local command="print -P"
local progname="${TOMBEXEC##*/}"
local pchars=""
local pcolor="normal"
local fd=2
local -i returncode
case "$1" in
inline)
command+=" -n"; pchars=" > "; pcolor="yellow"
;;
message)
pchars=" . "; pcolor="white"
;;
verbose)
pchars="[D]"; pcolor="blue"
;;
success)
pchars="(*)"; pcolor="green"
;;
warning)
pchars="[W]"; pcolor="yellow"
;;
failure)
pchars="[E]"; pcolor="red"
returncode=1
;;
print)
progname=""
fd=1
;;
*)
pchars="[F]"; pcolor="red"
msg="Developer oops! Usage: _msg MESSAGE_TYPE \"MESSAGE_CONTENT\""
returncode=127
;;
esac
[[ -n $_MSG_FD_OVERRIDE ]] && fd=$_MSG_FD_OVERRIDE
if [[ -t $fd ]]; then
[[ -n "$progname" ]] && progname="$fg[magenta]$progname$reset_color"
[[ -n "$pchars" ]] && pchars="$fg_bold[$pcolor]$pchars$reset_color"
msg="$fg[$pcolor]$msg$reset_color"
fi
${=command} "${progname}" "${pchars}" "${msg}" >&$fd
return $returncode
}
function _message() {
local notice="message"
[[ "$1" = "-n" ]] && shift && notice="inline"
option_is_set -q || _msg "$notice" $@
return 0
}
function _verbose() {
option_is_set -D && _msg verbose $@
return 0
}
function _success() {
option_is_set -q || _msg success $@
return 0
}
function _warning() {
option_is_set -q || _msg warning $@
return 1
}
function _failure() {
typeset -i exitcode=${exitv:-1}
option_is_set -q || _msg failure $@
# be sure we forget the secrets we were told
exit $exitcode
}
function _print() {
option_is_set -q || _msg print $@
return 0
}
_list_optional_tools() {
typeset -a _deps
_deps=(gettext dcfldd shred steghide)
_deps+=(resize2fs tomb-kdb-pbkdf2 argon2 qrencode recoll unoconv lsof)
for d in $_deps; do
_print "`which $d`"
done
return 0
}
# Check program dependencies
#
# Tomb depends on system utilities that must be present, and other
# functionality that can be provided by various programs according to
# what's available on the system. If some required commands are
# missing, bail out.
_ensure_dependencies() {
# Check for required programs
for req in cryptsetup gpg mkfs.ext4 e2fsck; do
command -v $req 1>/dev/null 2>/dev/null || {
_failure "Missing required dependency ::1 command::. Please install it." $req; }
done
# Check for pinentry or at least pinentry-tty (which has no alias)
if ! command -v pinentry 1>/dev/null 2>/dev/null; then
if ! command -v pinentry-tty 1>/dev/null 2>/dev/null; then
_failure "Missing required dependency ::1 command::. Please install it." pinentry
fi
fi
# Ensure system binaries are available in the PATH
path+=(/sbin /usr/sbin) # zsh magic
# use pkexec in place of sudo if found in path and polkitd is running
# command -v pkexec 1>/dev/null 2>/dev/null
# [[ $? == 0 ]] && ps ax | grep '[p]olkitd' 1>/dev/null 2>/dev/null && {
# SUDO=(pkexec) }
# [[ "$SUDO" == "sudo" ]] && {
# command -v sudo 1>/dev/null 2>/dev/null ||
# _failure "No privilege escalation tool found, not even sudo"
# }
# Which dd command to use
command -v dcfldd 1>/dev/null 2>/dev/null && DD=(dcfldd statusinterval=1)
# Which wipe command to use
command -v shred 1>/dev/null 2>/dev/null && WIPE=(shred -f -u)
# Check for lsof for slamming tombs
command -v lsof 1>/dev/null 2>/dev/null || LSOF=0
# Check for steghide
command -v steghide 1>/dev/null 2>/dev/null || STEGHIDE=0
# Check for cloakify
command -v cloakify 1>/dev/null 2>/dev/null || CLOAKIFY=0
# Check for decloakify
command -v decloakify 1>/dev/null 2>/dev/null || DECLOAKIFY=0
# Check for pitchforkedsphinx client
command -v sphinx 1>/dev/null 2>/dev/null || SPHINX=0
# Check for resize
command -v resize2fs 1>/dev/null 2>/dev/null || RESIZER=0
# Check for KDF auxiliary tools
command -v tomb-kdb-pbkdf2 1>/dev/null 2>/dev/null || KDF=0
# Check for ARGON2 KDF auxiliary tools
command -v argon2 1>/dev/null 2>/dev/null || ARGON2=0
# Check for Recoll file content indexer
command -v recoll 1>/dev/null 2>/dev/null || RECOLL=0
# Check for QREncode for paper backups of keys
command -v qrencode 1>/dev/null 2>/dev/null || QRENCODE=0
}
# }}} - Commandline interaction
# {{{ Key operations
# $@ is the list of all the recipient used to encrypt a tomb key
is_valid_recipients() {
typeset -a recipients
recipients=($@)
trusted=(m f u w s)
_verbose "is_valid_recipients"
# All the keys ID must be valid (the public keys must be present in the database)
for gpg_id in ${recipients[@]}; do
trust="$(gpg --with-colons --batch --list-keys "$gpg_id" 2> /dev/null |
awk 'BEGIN { FS=":" } /^pub/ { print $2; exit}')"
[[ "${trust}" == "" ]] && {
_warning "Not a valid GPG key ID: ::1 gpgid:: " $gpg_id
return 1
}
[[ ${trusted[(r)$trust]} != $trust ]] && {
_warning "The key ::1 gpgid:: is not trusted enough" $gpg_id
return 1
}
done
# At least one private key must be present
# for gpg_id in ${recipients[@]}; do
# gpg --with-colons --batch --list-secret-keys "$gpg_id" &> /dev/null
# [[ $? = 0 ]] && {
# return 0
# }
# done
return 0
}
# $@ is the list of all the recipient used to encrypt a tomb key
# Print the recipient arg to be used in gpg.
_recipients_arg() {
local arg="$1"; shift
typeset -a recipients
recipients=($@)
for gpg_id in ${recipients[@]}; do
print -R -n "$arg $gpg_id "
done
return 0
}
# $1 is a GPG key recipient
# Print the fingerprint of the GPG key
_gpg_fingerprint() {
gpg --with-colons --fingerprint "$1" |
awk 'BEGIN { FS=":" } /^fpr/ { print $10; exit }' }
_gpg_uid() {
gpg --with-colons --list-key "$1" |
awk 'BEGIN { FS=":" } /^uid/ { print $10; exit}' }
# helpers to retrieve data from passwd using getent
_get_username() { getent passwd ${1} | awk -F: '{print $1}' }
_get_home() { getent passwd ${1} | awk -F: '{print $6}' }
# $1 is the encrypted key contents we are checking
is_valid_key() {
local key="$1" # Unique argument is an encrypted key to test
_verbose "is_valid_key"
[[ -z $key ]] && key=$TOMBKEY
[[ "$key" = "cleartext" ]] && {
{ option_is_set --unsafe } || {
_warning "cleartext key from stdin selected: this is unsafe."
exitv=127 _failure "please use --unsafe if you really want to do this."
}
_warning "received key in cleartext from stdin (unsafe mode)"
return 0 }
[[ -z $key ]] && {
_warning "is_valid_key() called without an argument."
return 1
}
# If the key file is an image don't check file header
[[ -r $TOMBKEYFILE ]] \
&& [[ $(file $TOMBKEYFILE) =~ "JP.G" ]] \
&& {
_message "Key is an image, it might be valid."
return 0 }
[[ $KDF == 1 ]] && { ! option_is_set -g } && { option_is_set --kdf } && {
_head="${key[(f)1]}"
[[ $_head =~ '^_KDF_' ]] || {
_warning "Key is missing KDF header."
return 1
}
}
[[ $key =~ "BEGIN PGP" ]] && {
_message "Key is valid."
return 0 }
return 1
}
# $1 is a string containing an encrypted key
recover_key() {
local key="${1}" # Unique argument is an encrypted key
_warning "Attempting key recovery."
_head="${key[(f)1]}" # take the first line
TOMBKEY="" # Reset global variable
[[ $_head =~ "^_KDF_" ]] && TOMBKEY+="$_head\n"
TOMBKEY+="-----BEGIN PGP MESSAGE-----\n"
TOMBKEY+="$key\n"
TOMBKEY+="-----END PGP MESSAGE-----\n"
return 0
}
# Retrieve the tomb key from the file specified from the command line,
# or from stdin if -k - was selected. Run validity checks on the
# file. On success, return 0 and print out the full path of the key.
# Set global variables TOMBKEY and TOMBKEYFILE.
_load_key() {
local keyfile="$1" # Unique argument is an optional keyfile
[[ -z $keyfile ]] && keyfile=$(option_value -k)
[[ -z $keyfile ]] && {
_failure "This operation requires a key file to be specified using the -k option." }
if [[ $keyfile == "-" ]]; then
_verbose "load_key reading from stdin."
_message "Waiting for the key to be piped from stdin... "
TOMBKEYFILE=stdin
TOMBKEY=$(cat)
elif [[ $keyfile == "cleartext" ]]; then
_verbose "load_key reading SECRET from stdin"
_message "Waiting for the key to be piped from stdin... "
TOMBKEYFILE=cleartext
TOMBKEY=cleartext
TOMBSECRET=$(cat)
else
_verbose "load_key argument: ::1 key file::" $keyfile
[[ -r $keyfile ]] || _failure "Key not found, specify one using -k."
_track_stat "$keyfile"
TOMBKEYFILE=$keyfile
TOMBKEY="${mapfile[$TOMBKEYFILE]}"
fi
_verbose "load_key: ::1 key::" $TOMBKEYFILE
[[ -z $TOMBKEY ]] && {
# something went wrong, there is no key to load
# this occurs especially when piping from stdin and aborted
_failure "Key not found, specify one using -k."
}
is_valid_key $TOMBKEY || {
_warning "The key seems invalid or its format is not known by this version of Tomb."
recover_key $TOMBKEY
}
# Declared TOMBKEYFILE (path)
# Declared TOMBKEY (contents)
return 0
}
# takes two args just like get_lukskey
# prints out the decrypted content
# contains tweaks for different gpg versions
# support both symmetric and asymmetric encryption
gpg_decrypt() {
# fix for gpg 1.4.11 where the --status-* options don't work ;^/
local gpgver=$(gpg --version --no-permission-warning | awk '/^gpg/ {print $3}')
local gpgpass="$1\n$TOMBKEY"
local tmpres ret
typeset -a gpgopt
gpgpopt=(--batch --no-tty --passphrase-fd 0 --no-options)
{ option_is_set -g } && {
gpgpass="$TOMBKEY"
gpgpopt=(--yes)
# GPG option '--try-secret-key' exist since GPG 2.1
{ option_is_set -R } && { autoload -U is-at-least && is-at-least "2.1" $gpgver } && {
typeset -a recipients
recipients=(${(s:,:)$(option_value -R)})
{ is_valid_recipients $recipients } || {
_failure "You set an invalid GPG ID."
}
gpgpopt+=(`_recipients_arg "--try-secret-key" $recipients`)
}
}
[[ $gpgver == "1.4.11" ]] && {
_verbose "GnuPG is version 1.4.11 - adopting status fix."
TOMBSECRET=`print - "$gpgpass" | \
gpg --decrypt ${gpgpopt[@]}`
ret=$?
unset gpgpass
return $ret
}
_tmp_create
tmpres=$TOMBTMP
TOMBSECRET=`print - "$gpgpass" | \
gpg --decrypt ${gpgpopt[@]} \
--status-fd 2 --no-mdc-warning --no-permission-warning \
--no-secmem-warning 2> $tmpres`
unset gpgpass
ret=1
for i in ${(f)"$(cat $tmpres)"}; do
_verbose "$i"
[[ "$i" =~ "DECRYPTION_OKAY" ]] && ret=0;
done
return $ret
}
# 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
_verbose "get_lukskey"
_password="$1"
firstline="${TOMBKEY[(f)1]}"
# key is KDF encoded
if [[ $firstline =~ '^_KDF_' ]]; then
kdf_hash="${firstline[(ws:_:)2]}"
_verbose "KDF: ::1 kdf::" "$kdf_hash"
case "$kdf_hash" in
"pbkdf2sha1")
kdf_salt="${firstline[(ws:_:)3]}"
kdf_ic="${firstline[(ws:_:)4]}"
kdf_len="${firstline[(ws:_:)5]}"
_message "Unlocking KDF key protection (::1 kdf::)" $kdf_hash
_verbose "KDF salt: $kdf_salt"
_verbose "KDF ic: $kdf_ic"
_verbose "KDF len: $kdf_len"
_password=$(tomb-kdb-pbkdf2 $kdf_salt $kdf_ic $kdf_len 2>/dev/null <<<$_password)
;;
"argon2")
kdf_salt="${firstline[(ws:_:)3]}"
kdf_ic="${firstline[(ws:_:)4]}"
kdf_mem="${firstline[(ws:_:)5]}"
_message "Unlocking KDF key protection (::1 kdf::)" $kdf_hash
_verbose "KDF salt: $kdf_salt"
_verbose "KDF ic: $kdf_ic"
_verbose "KDF mem: $kdf_mem"
_password=$(argon2 $kdf_salt -m $kdf_mem -t $kdf_ic -l 64 -r 2>/dev/null <<<$_password)
;;
*)
_failure "No suitable program for KDF ::1 program::." $pbkdf_hash
unset _password
return 1
;;
esac
# key needs to be exhumed from an image
elif [[ -r $TOMBKEYFILE && $(file $TOMBKEYFILE) =~ "JP.G" ]]; then
if option_is_set -g; then
# When using a GPG key, the tomb key is buried using a steganography password
if option_is_set --tomb-pwd; then
_password="`option_value --tomb-pwd`"
_verbose "tomb-pwd = ::1 tomb pass::" $_password
else
_password=$(ask_password "Insert password to exhume key from $imagefile")
[[ $? != 0 ]] && {
_warning "User aborted password dialog."
return 1
}
fi
exhume_key $TOMBKEYFILE "$_password"
unset _password
else
exhume_key $TOMBKEYFILE "$_password"
fi
fi
gpg_decrypt "$_password" # Save decrypted contents into $TOMBSECRET
ret="$?"
_verbose "get_lukskey returns ::1::" $ret
return $ret
}
# 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 saves
# the password in the global variable $TOMBPASSWORD
ask_key_password() {
[[ -z "$TOMBKEYFILE" ]] && {
_failure "Internal error: ask_key_password() called before _load_key()." }
[[ "$TOMBKEYFILE" = "cleartext" ]] && {
_verbose "no password needed, using secret bytes from stdin"
return 0 }
if option_is_set -g; then
_verbose "no password needed, using GPG key"
get_lukskey
return $?
fi
_message "A password is required to use key ::1 key::" $TOMBKEYFILE
passok=0
tombpass=""
if [[ -z $1 ]]; then
for c in 1 2 3; do
if [[ $c == 1 ]]; then
tombpass=$(ask_password "Insert password to: $TOMBKEYFILE")
else
tombpass=$(ask_password "Insert password to: $TOMBKEYFILE (attempt $c)")
fi
[[ $? = 0 ]] || {
_warning "User aborted password dialog."
return 1
}
get_lukskey "$tombpass"
[[ $? = 0 ]] && {
passok=1; _message "Password OK."
break;
}
done
else
# if a second argument is present then the password is already known
tombpass="$1"
_verbose "ask_key_password with tombpass: ::1 tomb pass::" $tombpass
# if sphinx mode is chosen, use the provided input
# as master password to retrieve the actual password
if option_is_set --sphx-user || option_is_set --sphx-host; then
tombpass=$(sphinx_get_password "$tombpass")
fi
get_lukskey "$tombpass"
[[ $? = 0 ]] && {
passok=1; _message "Password OK."
}
fi
[[ $passok == 1 ]] || return 1
TOMBPASSWORD=$tombpass
return 0
}
# call cryptsetup with arguments using the currently known secret
# echo flags eliminate newline and disable escape (BSD_ECHO)
_cryptsetup() {
if option_is_set -q; then
print -R -n - "$TOMBSECRET" | _sudo cryptsetup --type luks1 --key-file - ${@} 2> /dev/null
else
print -R -n - "$TOMBSECRET" | _sudo cryptsetup --type luks1 --key-file - ${@}
fi
return $?
}
# change tomb key password
change_passwd() {
local tmpnewkey lukskey c tombpass tombpasstmp
_check_swap # Ensure swap is secure, if any
_load_key # Try loading key from option -k and set TOMBKEYFILE
{ option_is_set -g } && {
_message "Commanded to change GnuPG key for tomb key ::1 key::" $TOMBKEYFILE
} || {
_message "Commanded to change password for tomb key ::1 key::" $TOMBKEYFILE
}
_tmp_create
tmpnewkey=$TOMBTMP
if option_is_set --tomb-old-pwd; then
local tomboldpwd="`option_value --tomb-old-pwd`"
_verbose "tomb-old-pwd = ::1 old pass::" $tomboldpwd
ask_key_password "$tomboldpwd"
else
ask_key_password
fi
[[ $? == 0 ]] || _failure "No valid password supplied."
{ option_is_set -g } && {
_success "Changing GnuPG key for ::1 key file::" $TOMBKEYFILE
} || {
_success "Changing password for ::1 key file::" $TOMBKEYFILE
}
# Here $TOMBSECRET contains the key material in clear
{ option_is_set --tomb-pwd } && {
local tombpwd="`option_value --tomb-pwd`"
_verbose "tomb-pwd = ::1 new pass::" $tombpwd
gen_key "$tmpnewkey" "$tombpwd"
} || {
gen_key "$tmpnewkey"
}
{ is_valid_key "${mapfile[$tmpnewkey]}" } || {
_failure "Error: the newly generated keyfile does not seem valid." }
# Copy the new key as the original keyfile name
cp -f "${tmpnewkey}" $TOMBKEYFILE
{ option_is_set -g } && {
_success "Your GnuPG key was successfully changed"
} || {
_success "Your passphrase was successfully updated."
}
return 0
}
# takes care to encrypt a key
# honored options: --kdf --tomb-pwd -o -g -r
gen_key() {
# $1 key file
# $2 the password to use; if not set ask user
# -o is the --cipher-algo to use (string taken by GnuPG)
local algopt="`option_value -o`"
local algo="${algopt:-AES256}"
local gpgpass opt
local recipients_opt
typeset -a gpgopt
local sphx_host_tmp
local sphx_user_tmp
# here user is prompted for key password
tombpass=""
tombpasstmp=""
# remove sphinx opts not to mess with initial password prompt
option_is_set --sphx-user && {
sphx_user_tmp="$(option_value --sphx-user)"
unset "OPTS[--sphx-user]"
}
option_is_set --sphx-host && {
sphx_host_tmp="$(option_value --sphx-host)"
unset "OPTS[--sphx-host]"
}
if option_is_set -g; then
gpgopt=(--encrypt)
if option_is_set -r || option_is_set -R; then
typeset -a recipients
if option_is_set -r; then
recipients=(${(s:,:)$(option_value -r)})
recipients_opt="--recipient"
else
recipients=(${(s:,:)$(option_value -R)})
recipients_opt="--hidden-recipient"
fi
is_valid_recipients $recipients || {
_failure "You set an invalid GPG ID."
}
_warning "You are going to encrypt a tomb key with ::1 nrecipients:: recipient(s)." ${#recipients}
_warning "It is your responsibility to check these fingerprints."
_warning "The fingerprints are:"
for gpg_id in ${recipients[@]}; do
_warning " `_gpg_fingerprint "$gpg_id"` :: `_gpg_uid "$gpg_id"`"
done
gpgopt+=(`_recipients_arg "$recipients_opt" $recipients`)
else
_message "No recipient specified, using default GPG key."
gpgopt+=("--default-recipient-self")
fi
# Set gpg inputs and options
gpgpass="$TOMBSECRET"
opt=''
else
if [ "$2" = "" ]; then
while true; do
# 3 tries to write two times a matching password
tombpass=`ask_password "Type the new password to secure your key"`
if [[ $? != 0 ]]; then
_failure "User aborted."
fi
if [ -z $tombpass ]; then
_failure "You set empty password, which is not possible."
fi
tombpasstmp=$tombpass
tombpass=`ask_password "Type the new password to secure your key (again)"`
if [[ $? != 0 ]]; then
_failure "User aborted."
fi
if [ "$tombpasstmp" = "$tombpass" ]; then
break;
fi
unset tombpasstmp
unset tombpass
done
else
tombpass="$2"
_verbose "gen_key takes tombpass from CLI argument: ::1 tomb pass::" $tombpass
fi
# if sphinx mode is chosen, use the provided input
# as master password to generate the actual password
if [[ ! -z $sphx_host_tmp ]] || [[ ! -z $sphx_user_tmp ]]; then
OPTS[--sphx-user]=$sphx_user_tmp
OPTS[--sphx-host]=$sphx_host_tmp
unset sphx_user_tmp
unset sphx_host_tmp
tombpass=$(sphinx_set_password "$tombpass")
if [[ $? != 0 ]]; then
_failure "User aborted."
fi
fi
header=""
[[ $KDF == 1 ]] && {
{ option_is_set --kdf } && {
# KDF is a new key strenghtening technique against brute forcing
# see: https://github.com/dyne/Tomb/issues/82
itertime="`option_value --kdf`"
# removing support of floating points because they can't be type checked well
# if [[ "$itertime" != <-> ]]; then
# unset tombpass
# unset tombpasstmp
# _warning "Wrong argument for --kdf: must be an integer number (iteration seconds)."
# _failure "Depending on the speed of machines using this tomb, use 1 to 10, or more"
# return 1
# fi
# # --kdf takes one parameter: iter time (on present machine) in seconds
kdftype="`option_value --kdftype`"
kdftype=${kdftype:-pbkdf2}
case ${kdftype} in
pbkdf2)
local -i microseconds
microseconds=$(( itertime * 1000000 ))
_success "Using KDF, iteration time: ::1 microseconds::" $microseconds
_message "generating salt"
pbkdf2_salt=`tomb-kdb-pbkdf2-gensalt`
_message "calculating iterations"
pbkdf2_iter=`tomb-kdb-pbkdf2-getiter $microseconds`
_message "encoding the password"
# 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"
;;
argon2)
_success "Using KDF Argon2"
kdfmem="`option_value --kdfmem`"
kdfmem=${kdfmem:-18}
_message "memory used: 2^::1 kdfmemory::" $kdfmem
itertime="`option_value --kdf`"
itertime=${itertime:-3}
kdfsalt=`tomb-kdb-pbkdf2-gensalt`
_message "kdf salt: ::1 kdfsalt::" $kdfsalt
_message "kdf iterations: ::1 kdfiterations::" $itertime
tombpass=`argon2 $kdfsalt -m $kdfmem -t $itertime -l 64 -r <<<"${tombpass}"`
header="_KDF_argon2_${kdfsalt}_${itertime}_${kdfmem}_64\n"
;;
esac
}
}
print $header >> "$1"
# Set gpg inputs and options
gpgpass="${tombpass}\n$TOMBSECRET"
gpgopt=(--passphrase-fd 0 --symmetric --no-options)
opt='-n'
fi
_tmp_create
local tmpres=$TOMBTMP
print $opt - "$gpgpass" \
| gpg --openpgp --force-mdc --cipher-algo ${algo} \
--batch --no-tty ${gpgopt} \
--status-fd 2 -o - --armor 2> $tmpres >> "$1"
unset gpgpass
# check result of gpg operation
for i in ${(f)"$(cat $tmpres)"}; do
_verbose "$i"
done
# print -n "${tombpass}" \
# | gpg --openpgp --force-mdc --cipher-algo ${algo} \
# --batch --no-options --no-tty --passphrase-fd 0 --status-fd 2 \
# -o - -c -a ${lukskey}
TOMBPASSWORD="$tombpass" # Set global variable
unset tombpass
unset tombpasstmp
}
# prints an array of ciphers available in gnupg (to encrypt keys)
list_gnupg_ciphers() {
# On gpg1 and gpg2 line 10 always point to available ciphers.
# Print those until the next section is found
ciphers=(`gpg --version | awk '
BEGIN { ciphers=0 }
NR==11 { gsub(/,/,""); sub(/^.*:/,""); print; ciphers=1; next }
/^.*:/ { ciphers=0 }
{ if(ciphers==0) { next } else { gsub(/,/,""); print; } }
'`)
print "${ciphers}"
return 1
}
# Steganographic function to bury a key inside an image.
# Requires steghide(1) to be installed
bury_key() {
_load_key # Try loading key from option -k and set TOMBKEY
imagefile=$PARAM
[[ "`file $imagefile`" =~ "JPEG" ]] || {
_warning "Encode failed: ::1 image file:: is not a jpeg image." $imagefile
return 1
}
_success "Encoding key ::1 tomb key:: inside image ::2 image file::" $TOMBKEY $imagefile
{ option_is_set -g } && {
_message "Using GnuPG Key ID"
} || {
_message "Please confirm the key password for the encoding"
}
# We ask the password and test if it is the same encoding the
# base key, to insure that the same password is used for the
# encryption and the steganography. This is a standard enforced
# by Tomb, but it isn't strictly necessary (and having different
# password would enhance security). Nevertheless here we prefer
# usability.
# However, steganography cannot be done with GPG key. Therefore,
# if using a GPG key, we test if the user can decrypt the tomb
# with its key and we ask for a steganography password.
{ option_is_set --tomb-pwd } && { ! option_is_set -g } && {
local tombpwd="`option_value --tomb-pwd`"
_verbose "tomb-pwd = ::1 tomb pass::" $tombpwd
ask_key_password "$tombpwd"
} || {
ask_key_password
}
[[ $? != 0 ]] && {
_warning "Wrong password/GnuPG ID supplied."
_failure "You shall not bury a key whose password is unknown to you." }
if option_is_set -g && option_is_set --tomb-pwd; then
TOMBPASSWORD="`option_value --tomb-pwd`"
_verbose "tomb-pwd = ::1 tomb pass::" $TOMBPASSWORD
elif option_is_set -g; then
tombpass=""
tombpasstmp=""
while true; do
# 3 tries to write two times a matching password
tombpass=`ask_password "Type a password to bury your key"`
if [[ $? != 0 ]]; then
_failure "User aborted."
fi
if [ -z $tombpass ]; then
_failure "You set empty password, which is not possible."
fi
tombpasstmp=$tombpass
tombpass=`ask_password "Type a password to bury your key (again)"`
if [[ $? != 0 ]]; then
_failure "User aborted."
fi
if [ "$tombpasstmp" = "$tombpass" ]; then
break;
fi
unset tombpasstmp
unset tombpass
done
TOMBPASSWORD="$tombpass"
fi
# We omit armor strings since having them as constants can give
# ground to effective attacks on steganography
print - "$TOMBKEY" | awk '
/^-----/ {next}
/^Version/ {next}
{print $0}' \
| steghide embed --embedfile - --coverfile ${imagefile} \
-p $TOMBPASSWORD -z 9 -e serpent cbc
if [ $? != 0 ]; then
_warning "Encoding error: steghide reports problems."
res=1
else
_success "Tomb key encoded succesfully into image ::1 image file::" $imagefile
res=0
fi
return $res
}
# mandatory 1st arg: the image file where key is supposed to be
# optional 2nd arg: the password to use (same as key, internal use)
# optional 3rd arg: the key where to save the result (- for stdout)
exhume_key() {
[[ -z $1 ]] && {
_failure "Exhume failed, no image specified" }
local imagefile="$1" # The image file where to look for the key
local tombpass="$2" # (Optional) the password to use (internal use)
local destkey="$3" # (Optional) the key file where to save the
# result (- for stdout)
local r=1 # Return code (default: fail)
# write all messages to stderr to avoid polluting stdout
_MSG_FD_OVERRIDE=2
# Ensure the image file is a readable JPEG
[[ ! -r $imagefile ]] && {
_failure "Exhume failed, image file not found: ::1 image file::" "${imagefile:-none}" }
[[ ! $(file "$imagefile") =~ "JP.G" ]] && {
_failure "Exhume failed: ::1 image file:: is not a jpeg image." $imagefile }
# When a password is passed as argument then always print out
# the exhumed key on stdout without further checks (internal use)
[[ -n "$tombpass" ]] && {
TOMBKEY=$(steghide extract -sf $imagefile -p $tombpass -xf -)
[[ $? != 0 ]] && {
_failure "Wrong password or no steganographic key found" }
recover_key $TOMBKEY
return 0
}
# Ensure we have a valid destination for the key
[[ -z $destkey ]] && { option_is_set -k } && destkey=$(option_value -k)
[[ -z $destkey ]] && {
destkey="-" # No key was specified: fallback to stdout
_message "printing exhumed key on stdout" }
# Bail out if destination exists, unless -f (force) was passed
[[ $destkey != "-" && -s $destkey ]] && {
_warning "File exists: ::1 tomb key::" $destkey
{ option_is_set -f } && {
_warning "Use of --force selected: overwriting."
rm -f $destkey
} || {
_warning "Make explicit use of --force to overwrite."
_failure "Refusing to overwrite file. Operation aborted." }
}
_message "Trying to exhume a key out of image ::1 image file::" $imagefile
{ option_is_set --tomb-pwd } && {
tombpass=$(option_value --tomb-pwd)
_verbose "tomb-pwd = ::1 tomb pass::" $tombpass
} || {
[[ -n $TOMBPASSWORD ]] && tombpass=$TOMBPASSWORD
} || {
tombpass=$(ask_password "Insert password to exhume key from $imagefile")
[[ $? != 0 ]] && {
_warning "User aborted password dialog."
return 1
}
}
# Extract the key from the image
steghide extract -sf $imagefile -p ${tombpass} -xf $destkey
r=$?
# Report to the user
[[ "$destkey" = "-" ]] && destkey="stdout"
[[ $r == 0 ]] && {
_success "Key succesfully exhumed to ::1 key::." $destkey
} || {
_warning "Nothing found in ::1 image file::" $imagefile
}
unset _MSG_FD_OVERRIDE
return $r
}
# Steganographic function to transform a key into harmless-looking text
# using a cipher
# Requires cloakify to be installed
#
# mandatory 1st arg: the cipher to use
# optional 2nd arg: the output file where to save the result (none for stdout)
cloakify_key() {
_load_key # Try loading key from option -k and set TOMBKEY
local cipher="$1" # The cipher to use
local destfile="$2" # (Optional) the output file where to save the
# result (none for stdout)
[[ -r "${cipher}" ]] ||
_failure "Cloak cipher file not found, see tomb/extras/cloak/ciphers"
_success "Encoding key ::1 tomb key:: using cipher ::2 cipher file::" $TOMBKEYFILE $cipher
# Ensure we have a valid destination for the cloaked key
[[ -z $destfile ]] && {
destfile="/dev/stdout" # No file was specified: fallback to stdout
_message "printing cloaked key on stdout" }
# Bail out if destination exists, unless -f (force) was passed
[[ $destfile != "/dev/stdout" && -s $destfile ]] && {
_warning "File exists: ::1 output file::" $destfile
{ option_is_set -f } && {
_warning "Use of --force selected: overwriting."
rm -f $destfile
} || {
_warning "Make explicit use of --force to overwrite."
_failure "Refusing to overwrite file. Operation aborted." }
}
# Cipher the key
cloakify -i $TOMBKEYFILE -c $cipher >$destfile
if [ $? != 0 ]; then
_warning "Encoding error: cloakify reports problems."
res=1
else
_success "Tomb key encoded succesfully"
res=0
fi
return $res
}
# mandatory 1st arg: the text file where key is supposed to be
# mandatory 2nd arg: the cipher to use
# optional 3rd arg: the key where to save the result (none for stdout)
decloakify_key() {
[[ -z $1 ]] && {
_failure "Uncloak failed, no text file specified" }
[[ -z $2 ]] && {
_failure "Uncloak failed, no cipher file specified" }
local textfile="$1" # The text file where to look for the key
local cipher="$2" # The cipher to use
local destkey="$3" # (Optional) the key file where to save the
# result (none for stdout)
local r=1 # Return code (default: fail)
# write all messages to stderr to avoid polluting stdout
_MSG_FD_OVERRIDE=2
# Ensure the text file is readable
[[ ! -r $textfile ]] && {
_failure "Uncloak failed, text file not found: ::1 text file::" "${textfile:-none}" }
# Ensure the cipher file is readable
[[ ! -r $cipher ]] && {
_failure "Uncloak failed, cipher file not found: ::1 cipher file::" "${cipher:-none}" }
# Ensure we have a valid destination for the key
[[ -z $destkey ]] && { option_is_set -k } && destkey=$(option_value -k)
[[ -z $destkey ]] && {
# No key was specified: fallback to stdout
_message "printing uncloaked key on stdout" }
# Bail out if destination exists, unless -f (force) was passed
[[ $destkey != "/dev/stdout" && -s $destkey ]] && {
_warning "File exists: ::1 tomb key::" $destkey
{ option_is_set -f } && {
_warning "Use of --force selected: overwriting."
rm -f $destkey
} || {
_warning "Make explicit use of --force to overwrite."
_failure "Refusing to overwrite file. Operation aborted." }
}
# Extract the key from the text file
if [[ -z "$destkey" ]]; then
decloakify -i "${textfile}" -c "${cipher}"
else
decloakify -i "${textfile}" -c "${cipher}" -o "${destkey}"
fi
r=$?
# Report to the user
[[ -z "$destkey" ]] && destkey="stdout"
[[ $r == 0 ]] && {
_success "Key succesfully uncloaked to ::1 key::." $destkey
} || {
_warning "Nothing found in ::1 text file::" $textfile
}
unset _MSG_FD_OVERRIDE
return $r
}
# Produces a printable image of the key contents so a backup on paper
# can be made and hidden in books etc.
engrave_key() {
_load_key # Try loading key from option -k and set TOMBKEYFILE
local keyname=$(basename $TOMBKEYFILE)
local pngname="$keyname.qr.png"
_success "Rendering a printable QRCode for key: ::1 tomb key file::" $TOMBKEYFILE
# we omit armor strings to save space
awk '/^-----/ {next}; /^Version/ {next}; {print $0}' $TOMBKEYFILE \
| qrencode --size 4 --level H --casesensitive -o $pngname
[[ $? != 0 ]] && {
_failure "QREncode reported an error." }
_success "Operation successful:"
# TODO: only if verbose and/or not silent
ls -lh $pngname
file $pngname
}
# }}} - Key handling
# {{{ Create
# Since version 1.5.3, tomb creation is a three-step process that replaces create_tomb():
#
# * dig a .tomb (the large file) using /dev/urandom (takes some minutes at least)
#
# * forge a .key (the small file) using /dev/random (good entropy needed)
#
# * lock the .tomb file with the key, binding the key to the tomb (requires dm_crypt format)
# Step one - Dig a tomb
#
# Synopsis: dig_tomb /path/to/tomb -s sizemebibytes
#
# 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 to improve overall tomb's security and prevent
# some attacks aiming at detecting how much data is in the tomb, or
# which blocks in the filesystem contain that data.
dig_tomb() {
# $1 arg is path to tomb
# Require the specification of the size of the tomb (-s) in MiB
local -i tombsize=$(option_value -s)
_message "Commanded to dig tomb ::1 tomb path::" $tombpath
[[ ! -z $1 ]] || _failure "Missing path to tomb"
[[ -n "$tombsize" ]] || _failure "Size argument missing, use -s"
[[ $tombsize == <-> ]] || _failure "Size must be an integer (mebibytes)"
[[ $tombsize -ge 10 ]] || _failure "Tombs can't be smaller than 10 mebibytes"
[[ -e $1 ]] && {
_warning "A tomb exists already. I'm not digging here:"
ls -lh $1
return 1
}
_success "Creating a new tomb in ::1 tomb path::" $1
_message "Generating ::1 tomb file:: of ::2 size::MiB" $1 $tombsize
touch "$1"
[[ $? = 0 ]] || {
_warning "Error creating the tomb ::1 tomb path::" $1
_failure "Operation aborted."
}
# Ensure that file permissions are safe even if interrupted
[[ -n $SUDO_USER ]] && chown ${_UID}:${_GID} "$1"
chmod 0600 $1
_verbose "Data dump using ::1:: from /dev/urandom" ${DD[1]}
${=DD} if=/dev/urandom bs=1048576 count=$tombsize of=$1
ls -lh "$1"
_success "Done digging ::1 tomb name::" $1
_message "Your tomb is not yet ready, you need to forge a key and lock it:"
_message "tomb forge ::1 tomb path::.key" $1
_message "tomb lock ::1 tomb path:: -k ::1 tomb path::.key" $1
return 0
}
# Step two -- Create a detached key to lock a tomb with
#
# Synopsis: forge_key [destkey|-k destkey] [-o cipher] [-r|-R gpgid]
#
# Arguments:
# -k path to destination keyfile
# -o Use an alternate algorithm
# -r GPG recipients to be used
#
forge_key() {
# can be specified both as simple argument or using -k
local destkey="$1"
{ option_is_set -k } && { destkey=$(option_value -k) }
local algo="AES256" # Default encryption algorithm
[[ -z "$destkey" ]] && {
_failure "A filename needs to be specified using -k to forge a new key." }
# _message "Commanded to forge key ::1 key::" $destkey
_check_swap # Ensure the available memory is safe to use
# Ensure GnuPG won't exit with an error before first run
local gpghome=${GNUPGHOME:-$HOME/.gnupg}
[[ -r $gpghome/pubring.gpg ]] || {
mkdir -p -m 0700 $gpghome
touch $gpghome/pubring.gpg }
# Do not overwrite any files accidentally
[[ -r "$destkey" ]] && {
ls -lh $destkey
_failure "Forging this key would overwrite an existing file. Operation aborted." }
touch $destkey
[[ $? == 0 ]] || {
_warning "Cannot generate encryption key."
_failure "Operation aborted." }
chmod 0600 $destkey
# Update algorithm if it was passed on the command line with -o
{ option_is_set -o } && algopt="$(option_value -o)"
[[ -n "$algopt" ]] && algo=$algopt
_message "Commanded to forge key ::1 key:: with cipher algorithm ::2 algorithm::" \
$destkey $algo
[[ $KDF == 1 ]] && { ! option_is_set -g } && {
_message "Using KDF to protect the key password (`option_value --kdf` rounds)"
}
TOMBKEYFILE="$destkey" # Set global variable
_warning "This operation takes time. Keep using this computer on other tasks."
_warning "Once done you will be asked to choose a password for your tomb."
_warning "To make it faster you can move the mouse around."
_warning "If you are on a server, you can use an Entropy Generation Daemon."
# Use /dev/urandom as the entropy source, unless --use-random is specified
local random_source=/dev/urandom
{ option_is_set --use-random } && random_source=/dev/random
_verbose "Data dump using ::1:: from ::2 source::" ${DD[1]} $random_source
TOMBSECRET=$(${=DD} bs=1 count=512 if=$random_source)
[[ $? == 0 ]] || {
_warning "Cannot generate encryption key."
_failure "Operation aborted." }
# Here the global variable TOMBSECRET contains the naked secret
{ option_is_set -g } && {
_success "Using GnuPG key(s) to encrypt your key: ::1 tomb key::" $TOMBKEYFILE
} || {
_success "Choose the password of your key: ::1 tomb key::" $TOMBKEYFILE
}
_message "(You can also change it later using 'tomb passwd'.)"
# _user_file $TOMBKEYFILE
tombname="$TOMBKEYFILE" # XXX ???
# the gen_key() function takes care of the new key's encryption
{ option_is_set --tomb-pwd } && {
local tombpwd="`option_value --tomb-pwd`"
_verbose "tomb-pwd = ::1 new pass::" $tombpwd
gen_key $TOMBKEYFILE "$tombpwd"
} || {
gen_key $TOMBKEYFILE
}
# load the key contents (set global variable)
TOMBKEY="${mapfile[$TOMBKEYFILE]}"
# this does a check on the file header
is_valid_key $TOMBKEY || {
_warning "The key does not seem to be valid."
_warning "Dumping contents to screen:"
print "${mapfile[$TOMBKEY]}"
_warning "--"
rm -f ${TOMBKEYFILE}
_failure "Operation aborted."
}
[[ -n $SUDO_USER ]] && chown ${_UID}:${_GID} "$TOMBKEYFILE"
_message "Done forging ::1 key file::" $TOMBKEYFILE
_success "Your key is ready:"
ls -lh $TOMBKEYFILE
}
# Step three -- Lock tomb
#
# Synopsis: tomb_lock file.tomb file.tomb.key [-o cipher] [-r gpgid]
#
# Lock the given tomb with the given key file, in fact formatting the
# loopback volume as a LUKS device.
# Default cipher 'aes-xts-plain64'can be overridden with -o
lock_tomb_with_key() {
# old default was aes-cbc-essiv:sha256
# Override with -o
# for more alternatives refer to cryptsetup(8)
local cipher="aes-xts-plain64"
local tombpath="$1" # First argument is the path to the tomb
[[ -n $tombpath ]] || {
_warning "No tomb specified for locking."
_warning "Usage: tomb lock file.tomb -k file.tomb.key"
return 1
}
is_valid_tomb $tombpath
_message "Commanded to lock tomb ::1 tomb file::" $TOMBFILE
[[ -f $TOMBPATH ]] || {
_failure "There is no tomb here. You have to dig it first." }
_verbose "Tomb found: ::1 tomb path::" $TOMBPATH
local filesystem=ext4
option_is_set --filesystem && {
filesystem=`option_value --filesystem`
local tombsize=`stat --format '%s' $tombpath`
case $filesystem in
ext3|ext4) ;;
ext3maxinodes|ext4maxinodes) ;;
btrfs)
if [[ $tombsize -lt 49283072 ]]; then
_failure "Filesystem ::1 filesystem:: not supported on tombs smaller than 47MB." \
$filesystem
fi
;;
btrfsmixedmode)
if [[ $tombsize -lt 18874368 ]]; then
_failure "Filesystem ::1 filesystem:: not supported on tombs smaller than 18MB." \
$filesystem
fi
;;
*)
_failure "Filesystem not supported: ::1 filesystem::" $filesystem
return 1
;;
esac
_success "Selected filesystem type $filesystem."
}
lo_check "$TOMBPATH"
_message "Checking if the tomb is empty (we never step on somebody else's bones)."
_sudo cryptsetup isLuks ${TOMBPATH}
if [ $? = 0 ]; then
# is it a LUKS encrypted nest? then bail out and avoid reformatting it
_warning "The tomb was already locked with another key."
_failure "Operation aborted. I cannot lock an already locked tomb. Go dig a new one."
else
_message "Fine, this tomb seems empty."
fi
_load_key # Try loading key from option -k and set TOMBKEYFILE
# the encryption cipher for a tomb can be set when locking using -c
{ option_is_set -o } && algopt="$(option_value -o)"
[[ -n "$algopt" ]] && cipher=$algopt
_message "Locking using cipher: ::1 cipher::" $cipher
# get the pass from the user and check it
if option_is_set --tomb-pwd; then
tomb_pwd="`option_value --tomb-pwd`"
_verbose "tomb-pwd = ::1 tomb pass::" $tomb_pwd
ask_key_password "$tomb_pwd"
else
ask_key_password
fi
[[ $? == 0 ]] || _failure "No valid password supplied."
_success "Locking ::1 tomb file:: with ::2 tomb key file::" $TOMBFILE $TOMBKEYFILE
_message "Formatting Luks mapped device."
_cryptsetup --batch-mode \
--cipher ${cipher} --hash sha512 --key-size 512 --key-slot 0 \
luksFormat ${TOMBPATH}
[[ $? == 0 ]] || {
_warning "cryptsetup luksFormat returned an error."
_failure "Operation aborted." }
_cryptsetup --cipher ${cipher} --hash sha512 luksOpen ${TOMBPATH} tomb.tmp
[[ $? == 0 ]] || {
_warning "cryptsetup luksOpen returned an error."
_failure "Operation aborted." }
_message "Formatting your Tomb with $filesystem filesystem."
case $filesystem in
ext3|ext4)
_sudo mkfs.${filesystem} -q -F -j -L $TOMBNAME /dev/mapper/tomb.tmp
;;
ext3maxinodes|ext4maxinodes) # TODO: cover with test
filesystem=${filesystem:0:4}
_sudo mkfs.${filesystem} -q -F -j -i 1024 -b 1024 -L $TOMBNAME /dev/mapper/tomb.tmp
;;
btrfs) # TODO: cover with test
_sudo mkfs.${filesystem} -q -L $TOMBNAME /dev/mapper/tomb.tmp
;;
btrfsmixedmode) # TODO: cover with test
filesystem=${filesystem:0:5}
_sudo mkfs.${filesystem} -q -M -L $TOMBNAME /dev/mapper/tomb.tmp
;;
esac
[[ $? == 0 ]] || {
_warning "Tomb format returned an error."
_sudo cryptsetup luksClose tomb.tmp
_failure "Your tomb ::1 tomb file:: may be corrupted." $TOMBFILE }
# Sync
_sudo cryptsetup luksClose tomb.tmp
_message "Done locking ::1 tomb name:: using Luks dm-crypt ::2 cipher::" $TOMBNAME $cipher
_success "Your tomb is ready in ::1 tomb path:: and secured with key ::2 tomb key::" \
$TOMBPATH $TOMBKEYFILE
return 0
}
# This function changes the key that locks a tomb
change_tomb_key() {
local tombkey="$1" # Path to the tomb's key file
local tombpath="$2" # Path to the tomb
_message "Commanded to reset key for tomb ::1 tomb path::" $tombpath
[[ -z "$tombpath" ]] && {
_warning "Command 'setkey' needs two arguments: the old key file and the tomb."
_warning "I.e: tomb -k new.tomb.key old.tomb.key secret.tomb"
_failure "Execution aborted."
}
_check_swap
is_valid_tomb $tombpath
lo_check "$TOMBPATH"
_sudo cryptsetup isLuks ${TOMBPATH}
# is it a LUKS encrypted nest? we check one more time
[[ $? == 0 ]] || {
_failure "Not a valid LUKS encrypted volume: ::1 volume::" $TOMBPATH }
_load_key $tombkey # Try loading given key and set TOMBKEY
# TOMBKEYFILE
local oldkey=$TOMBKEY
local oldkeyfile=$TOMBKEYFILE
# we have everything, prepare to mount
_success "Changing lock on tomb ::1 tomb name::" $TOMBNAME
_message "Old key: ::1 old key::" $oldkeyfile
# load the old key
if option_is_set --tomb-old-pwd; then
tomb_old_pwd="`option_value --tomb-old-pwd`"
_verbose "tomb-old-pwd = ::1 old pass::" $tomb_old_pwd
ask_key_password "$tomb_old_pwd"
else
ask_key_password
fi
[[ $? == 0 ]] || {
_failure "No valid password supplied for the old key." }
old_secret=$TOMBSECRET
# luksOpen the tomb (not really mounting, just on the loopback)
print -R -n - "$old_secret" | _sudo cryptsetup --key-file - \
luksOpen ${TOMBPATH} ${TOMBMAPPER}
[[ $? == 0 ]] || _failure "Unexpected error in luksOpen."
_load_key # Try loading new key from option -k and set TOMBKEYFILE
_message "New key: ::1 key file::" $TOMBKEYFILE
if option_is_set --tomb-pwd; then
tomb_new_pwd="`option_value --tomb-pwd`"
_verbose "tomb-pwd = ::1 tomb pass::" $tomb_new_pwd
ask_key_password "$tomb_new_pwd"
else
ask_key_password
fi
[[ $? == 0 ]] || {
_failure "No valid password supplied for the new key." }
_tmp_create
tmpnewkey=$TOMBTMP
print -R -n - "$TOMBSECRET" >> $tmpnewkey
print -R -n - "$old_secret" | _sudo cryptsetup --key-file - \
luksChangeKey "$TOMBPATH" "$tmpnewkey"
[[ $? == 0 ]] || _failure "Unexpected error in luksChangeKey."
_sudo cryptsetup luksClose "${TOMBMAPPER}" || _failure "Unexpected error in luksClose."
_success "Successfully changed key for tomb: ::1 tomb file::" $TOMBFILE
_message "The new key is: ::1 new key::" $TOMBKEYFILE
return 0
}
# }}} - Creation
# {{{ Open
_update_control_file() {
# make sure a control file exists, gives it user ownership
# and replaces it with new contents
# stdin = contents
# $1 = path to control file
# $2 = contents
[[ -z $2 ]] && return 1
_sudo touch "$1"
_sudo chown ${_UID}:${_GID} "$1"
print "$2" > "$1"
_verbose "updated control file $1 = $2"
}
_detect_filesystem() {
local device=$1
_verbose "detecting filesystem of ::1 device::" $device
print "`lsblk -in -o FSTYPE $device`"
}
# $1 = tombfile $2(optional) = mountpoint
mount_tomb() {
[[ -n "$1" ]] || _failure "No tomb name specified for opening."
_message "Commanded to open tomb ::1 tomb name::" $1
_check_swap
is_valid_tomb $1
_track_stat "$TOMBPATH"
_load_key # Try loading new key from option -k and set TOMBKEYFILE
tombmount="$2"
[[ -z "$tombmount" ]] && {
tombmount="/media/$TOMBNAME"
[[ -d /media ]] || { # no /media found, adopting /run/media/$USER (udisks2 compat)
tombmount="/run/media/$_USER/$TOMBNAME"
}
_message "Mountpoint not specified, using default: ::1 mount point::" "$tombmount"
}
_success "Opening ::1 tomb file:: on ::2 mount point::" $TOMBNAME "$tombmount"
# check if the mountpoint is already used
mounted_tombs=(`list_tomb_mounts`)
for t in ${mounted_tombs}; do
usedmount=${t[(ws:;:)2]}
[[ "$usedmount" == "$tombmount" ]] &&
_failure "Mountpoint already in use: ::1 mount point::" "$tombmount"
done
lo_check "$TOMBPATH"
_sudo cryptsetup isLuks ${TOMBPATH} || {
# is it a LUKS encrypted nest? see cryptsetup(1)
_failure "::1 tomb file:: is not a valid Luks encrypted storage file." $TOMBFILE }
_message "This tomb is a valid LUKS encrypted device."
luksdump="`_sudo cryptsetup luksDump ${TOMBPATH}`"
tombdump=(`print $luksdump | awk '
/^Cipher name/ {print $3}
/^Cipher mode/ {print $3}
/^Hash spec/ {print $3}'`)
_message "Cipher is \"::1 cipher::\" mode \"::2 mode::\" hash \"::3 hash::\"" $tombdump[1] $tombdump[2] $tombdump[3]
slotwarn=`print $luksdump | awk '
BEGIN { zero=0 }
/^Key slot 0/ { zero=1 }
/^Key slot.*ENABLED/ { if(zero==1) print "WARN" }'`
[[ "$slotwarn" == "WARN" ]] && {
_warning "Multiple key slots are enabled on this tomb. Beware: there can be a backdoor." }
_verbose "Tomb key: ::1 key file::" $TOMBKEYFILE
# take the name only, strip extensions
_verbose "Tomb name: ::1 tomb name:: (to be engraved)" $TOMBNAME
{ option_is_set --tomb-pwd } && { ! option_is_set -g } && {
tomb_pwd="`option_value --tomb-pwd`"
_verbose "tomb-pwd = ::1 tomb pass::" $tomb_pwd
ask_key_password "$tomb_pwd"
} || {
ask_key_password
}
[[ $? == 0 ]] || _failure "No valid password supplied."
_cryptsetup luksOpen ${TOMBPATH} ${TOMBMAPPER}
[[ $? = 0 ]] || {
_failure "Failure mounting the encrypted file." }
# array: [ cipher, keysize, loopdevice ]
tombstat=(`_sudo cryptsetup status ${TOMBMAPPER} | awk '
/cipher:/ {print $2}
/keysize:/ {print $2}
/device:/ {print $2}'`)
_success "Success unlocking tomb ::1 tomb name::" $TOMBNAME
_verbose "Key size is ::1 size:: for cipher ::2 cipher::" $tombstat[2] $tombstat[1]
filesystem=`_detect_filesystem /dev/mapper/${TOMBMAPPER}`
_message "Filesystem detected: ::1 filesystem::" $filesystem
# TODO: check if FS is supported, else close luks
_verbose "Tomb engraved as ::1 tomb name::" $TOMBNAME
if option_value_contains -o ro; then
_message "Skipping filesystem checks in read-only"
else
_message "Checking filesystem via ::1::" $tombstat[3]
case $filesystem in
ext3|ext4)
if option_is_set -q; then
_sudo fsck -p -C0 /dev/mapper/${TOMBMAPPER} > /dev/null
else
_sudo fsck -p -C0 /dev/mapper/${TOMBMAPPER}
fi
# TODO: btrfs filesystem label [<device>|<mount_point>] [<newlabel>]
_sudo tune2fs -L $TOMBNAME /dev/mapper/${TOMBMAPPER} > /dev/null
;;
btrfs)
_sudo btrfs check /dev/mapper/${TOMBMAPPER}
_sudo btrfs filesystem label /dev/mapper/${TOMBMAPPER} ${TOMBNAME}
;;
esac
fi
# we need root from here on
_sudo mkdir -p "$tombmount"
# Default mount options are overridden with the -o switch
{ option_is_set -o } && {
local oldmountopts=$MOUNTOPTS
MOUNTOPTS="$(option_value -o)" }
# TODO: safety check MOUNTOPTS
# safe_mount_options &&
_sudo mount -o $MOUNTOPTS /dev/mapper/${TOMBMAPPER} "${tombmount}"
# Clean up if the mount failed
[[ $? == 0 ]] || {
_warning "Error mounting ::1 mapper:: on ::2 tombmount::" $TOMBMAPPER "$tombmount"
[[ $oldmountopts != $MOUNTOPTS ]] && \
_warning "Are mount options '::1 mount options::' valid?" $MOUNTOPTS
# TODO: move cleanup to _endgame()
[[ -d "$tombmount" ]] && _sudo rmdir "$tombmount"
[[ -e /dev/mapper/$TOMBMAPPER ]] && _sudo cryptsetup luksClose $TOMBMAPPER
_failure "Cannot mount ::1 tomb name::" $TOMBNAME
}
_success "Success opening ::1 tomb file:: on ::2 mount point::" $TOMBFILE "$tombmount"
local tombtty tombhost tombuid tombuser
# print out when it was opened the last time, by whom and where
[[ -r "${tombmount}/.last" ]] && {
tombsince=$(cat "${tombmount}/.last")
tombsince=$(date --date=@$tombsince +%c)
tombtty=$(cat "${tombmount}/.tty")
tombhost=$(cat "${tombmount}/.host")
tomblast=$(cat "${tombmount}/.last")
tombuid=$(cat "${tombmount}/.uid" | tr -d ' ')
tombuser=`_get_username $tombuid`
_message "Last visit by ::1 user::(::2 tomb build::) from ::3 tty:: on ::4 host::" $tombuser $tombuid $tombtty $tombhost
_message "on date ::1 date::" $tombsince
[[ -r "${tombmount}"/.cleanexit ]] || _message "the door was slammed or shutdown called before umount."
}
# write down the UID and TTY that opened the tomb
option_value_contains -o ro || {
_update_control_file "${tombmount}/.uid" $_UID
_update_control_file "${tombmount}/.tty" $_TTY
# also the hostname
if command -v hostname >/dev/null; then
_update_control_file "${tombmount}/.host" `hostname`
elif [[ -r /etc/hostname ]]; then
_update_control_file "${tombmount}/.host" $(cat /etc/hostname)
else
_update_control_file "${tombmount}/.host" localhost
fi
# and the "last time opened" information
# in minutes since 1970, this is printed at next open
_update_control_file "${tombmount}/.last" `date +%s`
# human readable: date --date=@"`cat .last`" +%c
}
# process bind-hooks (mount -o bind of directories)
# and exec-hooks (execute on open)
option_is_set -n || {
exec_safe_bind_hooks "${tombmount}"
exec_safe_func_hooks open "${tombmount}"
}
# Changes ownership to current user. This facilitates a lot
# usability by single users. If a Tomb is opened read-only or it
# is "multiuser" and contains ACL "by convention" using UNIX
# ownership that needs to be preserved, then this behavior can be
# deactivated using -p
local dochown=true
option_value_contains -o ro && dochown=false
option_is_set -p && dochown=false
$dochown && _sudo chown -R ${_UID}:${_GID} "${tombmount}"
return 0
}
## HOOKS EXECUTION
#
# Execution of code inside a tomb may present a security risk, e.g.,
# if the tomb is shared or compromised, an attacker could embed
# malicious code. When in doubt, open the tomb with the -n switch in
# order to skip this feature and verify the files mount-hooks and
# bind-hooks inside the tomb yourself before letting them run.
# Mount files and directories from the tomb to the current user's HOME.
#
# Synopsis: exec_safe_bind_hooks /path/to/mounted/tomb
#
# This can be a security risk if you share tombs with untrusted people.
# In that case, use the -n switch to turn off this feature.
exec_safe_bind_hooks() {
local mnt="$1" # First argument is the mount point of the tomb
# Default mount options are overridden with the -o switch
[[ -n ${(k)OPTS[-o]} ]] && MOUNTOPTS=${OPTS[-o]}
# No HOME set? Note: this should never happen again.
[[ -z $HOME ]] && {
_warning "How pitiful! A tomb, and no HOME."
return 1 }
[[ -z $mnt || ! -d $mnt ]] && {
_warning "Cannot exec bind hooks without a mounted tomb."
return 1 }
[[ -r "$mnt/bind-hooks" ]] || {
_verbose "bind-hooks not found in ::1 mount point::" $mnt
return 0 }
typeset -Al maps # Maps of files and directories to mount
typeset -al mounted # Track already mounted files and directories
# better parsing for bind hooks checks for two separated words on
# each line, using zsh word separator array subscript
_bindhooks="${mapfile[${mnt}/bind-hooks]}"
for h in ${(f)_bindhooks}; do
h=${h//\\ /__ESC_SPACE__}
s="${h[(w)1]}"
d="${h[(w)2]}"
s=${s//__ESC_SPACE__/ }
d=${d//__ESC_SPACE__/ }
[[ -z $s ]] && { _warning "bind-hooks file is broken"; return 1 }
[[ -z $d ]] && { _warning "bind-hooks file is broken"; return 1 }
maps+=($s $d)
_verbose "bind-hook found: $s -> $d"
done
unset _bindhooks
for dir in ${(k)maps}; do
[[ "${dir[1]}" == "/" || "${dir[1,2]}" == ".." ]] && {
_warning "bind-hooks map format: local/to/tomb local/to/\$HOME"
continue }
[[ "${${maps[$dir]}[1]}" == "/" || "${${maps[$dir]}[1,2]}" == ".." ]] && {
_warning "bind-hooks map format: local/to/tomb local/to/\$HOME. Rolling back"
for dir in ${mounted}; do _sudo umount $dir; done
return 0 }
if [[ ! -r "$HOME/${maps[$dir]}" ]]; then
_warning "bind-hook target not existent, skipping ::1 home::/::2 subdir::" $HOME ${maps[$dir]}
elif [[ ! -r "$mnt/$dir" ]]; then
_warning "bind-hook source not found in tomb, skipping ::1 mount point::/::2 subdir::" $mnt $dir
else
_sudo mount -o bind,$MOUNTOPTS $mnt/$dir $HOME/${maps[$dir]} \
&& mounted+=("$HOME/${maps[$dir]}")
fi
done
}
# Execute automated actions configured in the tomb.
#
# Synopsis: exec_safe_func_hooks /path/to/mounted/tomb
#
# If an executable file named 'exec-hooks' is found inside the tomb,
# run 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.
# If you're mounting an untrusted tomb, be safe and use the -n switch
# to verify what it would run if you let it. This feature opens the
# possibility to make encrypted executables.
exec_safe_func_hooks() {
local mnt
mnt="$2"
# Only run if post-hooks has the executable bit set
[[ -x $mnt/exec-hooks ]] && {
_success "Exec hook: ::1 exec hook:: ::2 action::" \
"${mnt}/exec-hooks" "$1"
# here call two actions: open or close. Synopsis:
# $1 $2 $3 $4 $5
# open "$tombmount"
# close "$tombmount" "$tombname" "$tombloop" "$TOMBMAPPER"
$mnt/exec-hooks "$1" "$2" "$3" "$4" "$5"
return $?
}
return 0
}
# }}} - Tomb open
# {{{ List
# list all tombs mounted in a readable format
# $1 is optional, to specify a tomb
list_tombs() {
local tombname tombmount tombfs tombfsopts tombloop
local ts tombtot tombused tombavail tombpercent tombp tombsince
local tombtty tombhost tombuid tombuser
# list all open tombs
mounted_tombs=(`list_tomb_mounts $1`)
[[ ${#mounted_tombs} == 0 ]] && {
_failure "I can't see any 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%%%}
# obsolete way to get the last open date from /dev/mapper
# which doesn't work when tomb filename contain dots
# tombsince=`date --date=@${mapper[(ws:.:)3]} +%c`
# find out who opens it from where
[[ -r "${tombmount}/.tty" ]] && {
tombsince=$(cat "${tombmount}/.last")
tombsince=$(date --date=@$tombsince +%c)
tombtty=$(cat "${tombmount}/.tty")
tombhost=$(cat "${tombmount}/.host")
tombuid=$(cat "${tombmount}/.uid" | tr -d ' ')
tombuser=`_get_username $tombuid`
}
{ option_is_set --get-mountpoint } && { print "$tombmount"; continue }
_message "::1 tombname:: open on ::2 tombmount:: using ::3 tombfsopts::" \
$tombname "$tombmount" $tombfsopts
_verbose "::1 tombname:: attached to /dev/::2 tombloop:: device" $tombname $tombloop
_message "::1 tombname:: open since ::2 tombsince::" $tombname $tombsince
[[ -z "$tombtty" ]] || {
_message "::1 tombname:: open by ::2 tombuser:: from ::3 tombtty:: on ::4 tombhost::" \
$tombname $tombuser $tombtty $tombhost
}
_message "::1 tombname:: size ::2 tombtot:: of which ::3 tombused:: (::5 tombpercent::%) is used: ::4 tombavail:: free " \
$tombname $tombtot $tombused $tombavail $tombpercent
[[ ${tombp} -ge 90 ]] && {
_warning "::1 tombname:: warning: your tomb is almost full!" $tombname
}
# Now check hooks
mounted_hooks=(`list_tomb_binds $tombname "$tombmount"`)
for h in ${mounted_hooks}; do
_message "::1 tombname:: hooks ::2 hookdest::" \
$tombname ${h[(ws:;:)2]}
done
done
return 0
}
# 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() {
[[ -z "$1" ]] && {
# list all open tombs
_sudo findmnt -rvo SOURCE,TARGET,FSTYPE,OPTIONS,LABEL \
| awk '
BEGIN { main="" }
/^\/dev\/mapper\/tomb/ {
if(main==$1) next;
print $1 ";" $2 ";" $3 ";(" $4 ");[" $5 "]"
main=$1
}
'
} || {
# list a specific tomb
# add square parens if not present (detection)
local tname
if [[ "${1[1]}" = "[" ]]; then tname="$1"
else tname="[$1]"; fi
_sudo findmnt -rvo SOURCE,TARGET,FSTYPE,OPTIONS,LABEL \
| awk -vtomb="$tname" '
BEGIN { main="" }
/^\/dev\/mapper\/tomb/ {
if("["$5"]"!=tomb) next;
if(main==$1) next;
print $1 ";" $2 ";" $3 ";(" $4 ");[" $5 "]"
main=$1
}
'
}
}
# list_tomb_binds
# print out an array of mounted bind hooks (internal use)
# format is semi-colon separated list of attributes
# needs two arguments: name of tomb whose hooks belong
# mount tomb
list_tomb_binds() {
[[ -z "$2" ]] && {
_failure "Internal error: list_tomb_binds called without argument." }
# much simpler than the crazy from before
# in fact, the second parameter is now redundant
# as we only need the tomb name
# note that this code assumes that the tomb name is provided in square brackets
_sudo findmnt -ro SOURCE,TARGET,FSTYPE,OPTIONS,LABEL \
| grep -F "/dev/mapper/tomb" \
| awk -vpattern="$1" '
BEGIN { }
{
if("["$5"]"!=pattern) next;
if(index($1,"[")==0) next;
gsub("[[][^]]*[]]","",$1);
print $1 ";" $2 ";" $3 ";(" $4 ");[" $5 "]"
}
'
}
# }}} - Tomb list
# {{{ Index and search
# index files in all tombs for search
# $1 is optional, to specify a tomb
index_tombs() {
mounted_tombs=(`list_tomb_mounts $1`)
[[ ${#mounted_tombs} == 0 ]] && {
# Considering one tomb
[[ -n "$1" ]] && {
_failure "There seems to be no open tomb engraved as [::1::]" $1 }
# Or more
_failure "I can't see any open tomb, may they all rest in peace." }
_success "Creating and updating search indexes."
# # start the LibreOffice document converter if installed
# { command -v unoconv 1>/dev/null 2>/dev/null } && {
# unoconv -l 2>/dev/null &
# _verbose "unoconv listener launched."
# sleep 1 }
for t in ${mounted_tombs}; do
mapper=`basename ${t[(ws:;:)1]}`
tombname=${t[(ws:;:)5]}
tombmount="${t[(ws:;:)2]}"
[[ -r "${tombmount}/.noindex" ]] && {
_message "Skipping ::1 tomb name:: (.noindex found)." $tombname
continue }
{ command -v updatedb 1>/dev/null 2>/dev/null } && {
updatedbver=`updatedb --version | grep '^updatedb'`
if [[ "$updatedbver" =~ "GNU findutils" ]]; then
_warning "Cannot use GNU findutils for index/search commands."
# elif [[ "$updatedbver" =~ "locate" ]]; then
# _warning "Index command needs 'mlocate/plocate' to be installed."
else
_message "Indexing ::1 tomb name:: filenames..." $tombname
_verbose "$updatedbver"
updatedb -l 0 -o "${tombmount}/.updatedb" -U "${tombmount}"
fi
}
# here we use recoll to index file contents
[[ $RECOLL == 1 ]] && {
_message "Indexing ::1 tomb name:: contents..." $tombname
rm -f "${tombmount}/recoll.conf"
_message "Generating a new search index configuration: ::1 recoll conf::" "${tombmount}/recoll.conf"
mkdir -p "${tombmount}/.recoll"
cat <<EOF > "${tombmount}/recoll.conf"
topdirs = ${tombmount}
cachedir = ${tombmount}/.recoll
EOF
recollindex -c "${tombmount}"
}
_message "Search index updated."
done
return 0
}
search_tombs() {
{ command -v locate 1>/dev/null 2>/dev/null } || {
_failure "Cannot index tombs on this system: updatedb (mlocate/plocate) not installed." }
updatedbver=`updatedb --version | grep '^updatedb'`
[[ "$updatedbver" =~ "GNU findutils" ]] && {
_warning "Cannot use GNU findutils for index/search commands." }
[[ "$updatedbver" =~ "locate" ]] || {
_failure "Index command needs 'mlocate/plocate' to be installed." }
_verbose "$updatedbver"
# list all open tombs
mounted_tombs=(`list_tomb_mounts`)
[[ ${#mounted_tombs} == 0 ]] && {
_failure "I can't see any open tomb, may they all rest in peace." }
_success "Searching for: ::1::" ${(f)@}
for t in ${mounted_tombs}; do
_verbose "Checking for index: ::1::" ${t}
mapper=`basename ${t[(ws:;:)1]}`
tombname=${t[(ws:;:)5]}
tombmount="${t[(ws:;:)2]}"
[[ -r "${tombmount}/.updatedb" ]] && {
# Use mlocate/plocate to search hits on filenames
_message "Searching filenames in tomb ::1 tomb name::" $tombname
locate -d "${tombmount}/.updatedb" -e -i "${(f)@}"
_message "Matches found: ::1 matches::" \
$(locate -d "${tombmount}/.updatedb" -e -i -c ${(f)@})
# Use recoll to search over contents
[[ $RECOLL == 1 && -r "$tombmount/recoll.conf" ]] && {
_message "Searching contents in tomb ::1 tomb name::" $tombname
recollq -c "${tombmount}" ${@} }
} || {
_warning "Skipping tomb ::1 tomb name::: not indexed." $tombname
_warning "Run 'tomb index' to create indexes." }
done
_message "Search completed."
return 0
}
# }}} - Index and search
# {{{ Resize
# resize tomb file size
resize_tomb() {
local tombpath="$1" # First argument is the path to the tomb
_message "Commanded to resize tomb ::1 tomb name:: to ::2 size:: mebibytes." $1 $OPTS[-s]
[[ -z "$1" ]] && _failure "No tomb name specified for resizing."
[[ ! -r "$1" ]] && _failure "Cannot find ::1::" $1
newtombsize="`option_value -s`"
[[ -z "$newtombsize" ]] && {
_failure "Aborting operations: new size was not specified, use -s" }
is_valid_tomb $tombpath
_load_key # Try loading new key from option -k and set TOMBKEYFILE
if option_is_set --tomb-pwd; then
tomb_pwd="`option_value --tomb-pwd`"
_verbose "tomb-pwd = ::1 tomb pass::" $tomb_pwd
ask_key_password "$tomb_pwd"
else
ask_key_password
fi
[[ $? == 0 ]] || _failure "No valid password supplied."
local oldtombsize=$(( `stat -c %s "$TOMBPATH" 2>/dev/null` / 1048576 ))
# New tomb size must be specified
[[ -n "$newtombsize" ]] || {
_failure "You must specify the new size of ::1 tomb name::" $TOMBNAME }
# New tomb size must be an integer
[[ $newtombsize == <-> ]] || _failure "Size is not an integer."
# Tombs can only grow in size
if [[ "$newtombsize" -gt "$oldtombsize" ]]; then
delta="$(( $newtombsize - $oldtombsize ))"
_message "Generating ::1 tomb file:: of ::2 size::MiB" $TOMBFILE $newtombsize
_verbose "Data dump using ::1:: from /dev/urandom" ${DD[1]}
${=DD} if=/dev/urandom bs=1048576 count=${delta} >> $TOMBPATH
[[ $? == 0 ]] || {
_failure "Error creating the extra resize ::1 size::, operation aborted." \
$tmp_resize }
# If same size this allows to re-launch resize if pinentry expires
# so that it will continue resizing without appending more space.
# Resizing the partition to the file size cannot harm data anyway.
elif [[ "$newtombsize" = "$oldtombsize" ]]; then
_message "Tomb seems resized already, operating filesystem stretch"
else
_failure "The new size must be greater then old tomb size."
fi
lo_check "$TOMBPATH"
_message "opening tomb"
_cryptsetup luksOpen ${TOMBPATH} ${TOMBMAPPER} || {
_failure "Failure mounting the encrypted file." }
_sudo cryptsetup resize "${TOMBMAPPER}" || {
_failure "cryptsetup failed to resize ::1 mapper::" $TOMBMAPPER }
filesystem=`_detect_filesystem /dev/mapper/${TOMBMAPPER}`
_message "Filesystem detected: ::1 filesystem::" $filesystem
case $filesystem in
ext3|ext4)
_sudo e2fsck -p -f /dev/mapper/${TOMBMAPPER} || {
_sudo cryptsetup luksClose "${TOMBMAPPER}"
_failure "e2fsck failed to check ::1 mapper::" $TOMBMAPPER }
_sudo resize2fs /dev/mapper/${TOMBMAPPER} || {
_sudo cryptsetup luksClose "${TOMBMAPPER}"
_failure "resize2fs failed to resize ::1 mapper::" $TOMBMAPPER }
;;
btrfs)
_sudo btrfs check /dev/mapper/${TOMBMAPPER} || {
_sudo cryptsetup luksClose "${TOMBMAPPER}"
_failure "filesystem check failed on ::1 mapper::" $TOMBMAPPER }
# btrfs requires mounting before resize
local mp=${TOMBNAME}.tomb.resize
mkdir -p /tmp/${mp}
_sudo mount /dev/mapper/${TOMBMAPPER} /tmp/${mp}
_sudo btrfs filesystem resize max /tmp/${mp} || {
_sudo umount /tmp/${mp}
_sudo cryptsetup luksClose "${TOMBMAPPER}"
rmdir /tmp/${mp}
_failure "filesystem resize failed on ::1 mapper::" $TOMBMAPPER }
_sudo umount /tmp/${mp}
rmdir /tmp/${mp}
;;
# TODO: report error on unrecognized filesystem
esac
# close and free the loop device
_sudo cryptsetup luksClose "${TOMBMAPPER}"
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
[[ ${#mounted_tombs} == 0 ]] && {
_failure "There is no open tomb to be closed." }
[[ ${#mounted_tombs} -gt 1 && -z "$1" ]] && {
_warning "Too many tombs mounted, please specify one (see tomb list)"
_warning "or issue the command 'tomb close all' to close them all."
_failure "Operation aborted." }
for t in ${mounted_tombs}; do
mapper=`basename ${t[(ws:;:)1]}`
# strip square parens from tombname
tombname=${t[(ws:;:)5]}
tombmount="${t[(ws:;:)2]}"
tombfs=${t[(ws:;:)3]}
tombfsopts=${t[(ws:;:)4]}
tombloop=${mapper[(ws:.:)4]}
_verbose "Name: ::1 tomb name::" $tombname
_verbose "Mount: ::1 mount point::" "$tombmount"
_verbose "Loop: ::1 mount loop::" $tombloop
_verbose "Mapper: ::1 mapper::" $mapper
[[ -e "$mapper" ]] && {
_warning "Tomb not found: ::1 tomb file::" $1
_warning "Please specify an existing tomb."
return 0 }
option_is_set -n || {
exec_safe_func_hooks \
close "$tombmount" "$tombname" "$tombloop" "$mapper"
exec_hook_res=$?
[[ $exec_hook_res = 0 ]] || {
_warning "close exec-hook returns a non-zero error code: ::1 error::" $exec_hook_res
_failure "Operation aborted"
}
}
_message "Closing tomb ::1 tomb name:: mounted on ::2 mount point::" \
$tombname "$tombmount"
# check if there are bind mounted dirs and close them
bind_tombs=(`list_tomb_binds $tombname "$tombmount"`)
for b in ${bind_tombs}; do
bind_mapper="${b[(ws:;:)1]}"
bind_mount="${b[(ws:;:)2]}"
_message "Closing tomb bind hook: ::1 hook::" "$bind_mount"
_sudo umount "$(echo "$bind_mount")" ||
_failure "Tomb bind hook ::1 hook:: is busy, cannot close tomb." "$bind_mount"
done
# check if the tomb is actually still mounted. Background:
# When mounted on a binded directory in appears twice in 'list_tomb_binds'
# and will get umounted automatically through the above function
# causing an error and a remaining (decrypted!) loop device
# posing a security risk.
# See https://github.com/dyne/Tomb/issues/273
# checking for tombs still mounted
mounted_tombs=(`list_tomb_mounts`)
for t in ${mounted_tombs}; do
usedmount=${t[(ws:;:)2]}
[[ "$usedmount" == "$tombmount" ]] && {
_verbose "Performing umount of ::1 mount point::" "$tombmount"
touch "${tombmount}"/.cleanexit
_sudo umount "${tombmount}"
[[ $? = 0 ]] || {
rm -f "${tombmount}"/.cleanexit
_failure "Tomb is busy, cannot umount!"
}
}
done
# If we used a default mountpoint and is now empty, delete it
tombname_regex=${tombname//\[/}
tombname_regex=${tombname_regex//\]/}
[[ "$tombmount" =~ "(/run)?/media(/$_USER)?/$tombname_regex" ]] && {
_sudo rmdir "$tombmount" }
_sudo cryptsetup luksClose $mapper ||
_failure "Error occurred in cryptsetup luksClose ::1 mapper::" $mapper
_success "Tomb ::1 tomb name:: closed: your bones will rest in peace." $tombname
done # loop across mounted tombs
return 0
}
list_processes() {
# $1 = (optional) name of tomb
# runs lsof on the mounted_tombs
local mounted_tombs i
mounted_tombs=(`list_tomb_mounts $1`)
if [[ "${#mounted_tombs}" -gt 0 ]]; then
if [[ -z $1 ]]; then
_success "Listing processes running inside all open tombs..."
else
_success "Listing processes running inside tomb '::1 tombname::'..." "$1"
fi
for i in ${mounted_tombs}; do
_verbose "scanning tomb: ::1 tombmount::" $i
tombmount="${i[(ws:;:)2]}"
_sudo lsof +D "${i[(ws:;:)2]}"
done
fi
return 0
}
# Kill all processes using the tomb
slam_tomb() {
# $1 = (optional) name of tomb to slam, or "all" if more mounted
if [ "$1" = "all" ]; then
mounted_tombs=(`list_tomb_mounts`)
else
mounted_tombs=(`list_tomb_mounts $1`)
fi
[[ ${#mounted_tombs} == 0 ]] && {
_failure "There is no open tomb to be closed." }
[[ ${#mounted_tombs} -gt 1 && -z "$1" ]] && {
_warning "Too many tombs mounted, please specify one (see tomb list)"
_warning "or issue the command 'tomb close all' to close them all."
_failure "Operation aborted." }
local pnum puid pcmd powner result
result=0
# iterate through all mounted tomb affected
for i in ${mounted_tombs}; do
tombname=${i[(ws:;:)5]}
tombmount="${i[(ws:;:)2]}"
_success "Slamming tomb ::1 tombname:: mounted on ::2 tombmount::" \
${tombname} "${tombmount}"
# iterate through all processes running in mounted tombs
for pnum in ${(f)"$(_sudo lsof -t +D "$tombmount")"}; do
puid=$(cat /proc/${pnum}/loginuid)
pcmd=$(cat /proc/${pnum}/cmdline)
powner=`_get_username $puid`
_verbose "process found: $pnum $pcmd ($powner)"
# iterate through 3 different signals to send, break on success
for s in TERM HUP KILL; do
_message "::1 tombname:: sending ::2 sig:: to ::3 cmd:: (::4 uid::)" \
${tombname} ${s} ${pcmd} ${powner}
_sudo kill -$s $pnum
# give some time to the process for a clean quit
sleep .5
# stop sending other signals if kill was succesfull
[[ -r /proc/$pnum ]] || break
done
# if process still running then signal failure
[[ -r /proc/$pnum ]] && {
_warning "Can't kill ::1 process:: ::2 pcmd:: (::3 powner::)" \
$pnum $pcmd $powner
result=1 }
done
# if it failed killing a process, report it
[[ $result = 0 ]] && umount_tomb $tombname
done
return $result
}
# }}} - Tomb close
# {{{ Main routine
main() {
_ensure_dependencies # Check dependencies are present or bail out
local -A subcommands_opts
### Options configuration
#
# Hi, dear developer! Are you trying to add a new subcommand, or
# to add some options? Well, keep in mind that option names are
# global: they cannot bear a different meaning or behaviour across
# subcommands. The only exception is "-o" which means: "options
# passed to the local subcommand", and thus can bear a different
# meaning for different subcommands.
#
# For example, "-s" means "size" and accepts one argument. If you
# are tempted to add an alternate option "-s" (e.g., to mean
# "silent", and that doesn't accept any argument) DON'T DO IT!
#
# There are two reasons for that:
# I. Usability; users expect that "-s" is "size"
# II. Option parsing WILL EXPLODE if you do this kind of bad
# things (it will complain: "option defined more than once")
#
# If you want to use the same option in multiple commands then you
# can only use the non-abbreviated long-option version like:
# -force and NOT -f
#
main_opts=(q -quiet=q D -debug=D h -help=h v -version=v f -force=f -tmp: U: G: T: -no-color -unsafe g -gpgkey=g -sudo:)
subcommands_opts[__default]=""
# -o in open and mount is used to pass alternate mount options
subcommands_opts[open]="n -nohook=n k: -kdf: -kdftype: -kdfmem: o: -ignore-swap -tomb-pwd: r: R: -sphx-host: -sphx-user: p -preserve-ownership=p"
subcommands_opts[mount]=${subcommands_opts[open]}
subcommands_opts[create]="" # deprecated, will issue warning
# -o in forge and lock is used to pass an alternate cipher.
subcommands_opts[forge]="-ignore-swap k: -kdf: -kdftype: -kdfmem: o: -tomb-pwd: -use-random r: R: -sphx-host: -sphx-user: "
subcommands_opts[dig]="-ignore-swap s: -size=s "
subcommands_opts[lock]="-ignore-swap k: -kdf: -kdftype: -kdfmem: o: -tomb-pwd: r: R: -sphx-host: -sphx-user: -filesystem: "
subcommands_opts[setkey]="k: -ignore-swap -kdf: -kdftype: -kdfmem: -tomb-old-pwd: -tomb-pwd: r: R: -sphx-host: -sphx-user: "
subcommands_opts[engrave]="k: "
subcommands_opts[passwd]="k: -ignore-swap -kdf: -kdftype: -kdfmem: -tomb-old-pwd: -tomb-pwd: r: R: -sphx-host: -sphx-user: "
subcommands_opts[close]=""
subcommands_opts[help]=""
subcommands_opts[slam]=""
subcommands_opts[ps]=""
subcommands_opts[list]="-get-mountpoint "
subcommands_opts[index]=""
subcommands_opts[search]=""
subcommands_opts[bury]="k: -tomb-pwd: r: R: -sphx-host: -sphx-user: "
subcommands_opts[exhume]="k: -tomb-pwd: r: R: -sphx-host: -sphx-user: "
subcommands_opts[cloak]="k: "
subcommands_opts[uncloak]="k: "
# subcommands_opts[decompose]=""
# subcommands_opts[recompose]=""
# subcommands_opts[install]=""
subcommands_opts[askpass]=""
subcommands_opts[source]=""
subcommands_opts[resize]="-ignore-swap s: -size=s k: -tomb-pwd: r: R: -sphx-host: -sphx-user: "
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 --option-parsing
zparseopts -M -D -Adiscardme ${every_opts}
if [[ -n ${(k)discardme[--option-parsing]} ]]; then
print $1
if [[ -n "$1" ]]; then
return 1
fi
return 0
fi
unset discardme
if ! zparseopts -M -E -D -Adiscardme ${every_opts}; then
_failure "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 \"::1 subcommand::\"." $subcommand
exitv=127 _failure "Please try -h for help."
fi
argv=("${(@)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."
exitv=127 _failure "See \"tomb help\" for more info."
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 shouldn't be appended to PARAM
elif [[ $arg[1] == '-' ]]; then
if [[ $ok == 0 ]]; then
exitv=127 _failure "Unrecognized option ::1 arg:: for subcommand ::2 subcommand::" $arg $subcommand
fi
fi
PARAM+=$arg
done
# First parameter actually is the subcommand: delete it and shift
[[ $subcommand != '__default' ]] && { PARAM[1]=(); shift }
### End parsing command-specific options
# Use colors unless told not to
{ ! option_is_set --no-color } && { autoload -Uz colors && colors }
# Some options are only available during insecure mode
{ ! option_is_set --unsafe } && {
for opt in --tomb-pwd --tomb-old-pwd; do
{ option_is_set $opt } && {
exitv=127 _failure "You specified option ::1 option::, which is DANGEROUS and should only be used for testing\nIf you really want so, add --unsafe" $opt }
done
}
# read -t or --tmp flags to set a custom temporary directory
option_is_set --tmp && TMPDIR=$(option_value --tmp)
option_is_set --sudo && {
local _opt=`basename $(option_value --sudo)`
_message "Privilege escalation tool configured: ::1 exec::" $_opt
}
# When we run as root, we remember the original uid:gid to set
# permissions for the calling user and drop privileges
_whoami # Reset _UID, _GID, _TTY
[[ -z $PARAM ]] && {
_verbose "Tomb command: ::1 subcommand::" $subcommand
} || {
_verbose "Tomb command: ::1 subcommand:: ::2 param::" $subcommand $PARAM
}
[[ -z $_UID ]] || {
_verbose "Caller: uid[::1 uid::], gid[::2 gid::], tty[::3 tty::]." \
$_UID $_GID $_TTY
}
_verbose "Temporary directory: $TMPDIR"
# Process subcommand
case "$subcommand" in
# USAGE
help)
usage
;;
# DEPRECATION notice (leave here as 'create' is still present in old docs)
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)."
_failure "Operation aborted."
;;
# CREATE Step 1: dig -s NN file.tomb
dig)
dig_tomb $PARAM
;;
# CREATE Step 2: forge file.tomb.key
forge)
forge_key $PARAM
;;
# CREATE Step 3: lock -k file.tomb.key file.tomb
lock)
lock_tomb_with_key $PARAM
;;
# Open the tomb
mount|open)
mount_tomb $PARAM
;;
# List all processes using a tomb
ps)
list_processes $PARAM
;;
# Slam a tomb killing all processes running inside
slam)
slam_tomb $PARAM
;;
# Close the tomb
# `slam` is used to force closing.
umount|close)
[[ "$subcommand" == "slam" ]] && {
SLAM=1
[[ $LSOF == 0 ]] && {
unset SLAM
_warning "lsof not installed: cannot slam tombs."
_warning "Trying a regular close." }}
umount_tomb $PARAM[1]
;;
# Grow tomb's size
resize)
[[ $RESIZER == 0 ]] && {
_failure "Resize2fs not installed: cannot resize tombs." }
resize_tomb $PARAM[1]
;;
## Contents manipulation
# Index tomb contents
index)
index_tombs $PARAM[1]
;;
# List tombs
list)
list_tombs $PARAM[1]
;;
# Search tomb contents
search)
search_tombs $PARAM
;;
## Locking operations
# Export key to QR Code
engrave)
[[ $QRENCODE == 0 ]] && {
_failure "QREncode not installed: cannot engrave keys on paper." }
engrave_key $PARAM
;;
# Change password on existing key
passwd)
change_passwd $PARAM[1]
;;
# Change tomb key
setkey)
change_tomb_key $PARAM
;;
# STEGANOGRAPHY: hide key inside an image
bury)
[[ $STEGHIDE == 0 ]] && {
_failure "Steghide not installed: cannot bury keys into images." }
bury_key $PARAM[1]
;;
# STEGANOGRAPHY: read key hidden in an image
exhume)
[[ $STEGHIDE == 0 ]] && {
_failure "Steghide not installed: cannot exhume keys from images." }
exhume_key $PARAM[1]
;;
# STEGANOGRAPHY: transform key into text using cipher
cloak)
[[ $CLOAKIFY == 0 ]] && {
_failure "Cloakify not installed: cannot cipher keys into texts" }
cloakify_key $PARAM
;;
# STEGANOGRAPHY: read key from text using cipher
uncloak)
[[ $DECLOAKIFY == 0 ]] && {
_failure "Decloakify not installed: cannot decipher keys from texts" }
decloakify_key $PARAM
;;
## Internal commands useful to developers
# Make tomb functions available to the calling shell or script
'source') return 0 ;;
# Ask user for a password interactively
askpass) ask_password $PARAM[1] $PARAM[2] ;;
# Default operation: presentation, or version information with -v
__default)
_print "Tomb ::1 version:: - a strong and gentle undertaker for your secrets" $VERSION
echo
_print " Copyright (C) 2007-2024 Dyne.org Foundation, License GNU GPL v3+"
_print " This is free software: you are free to change and redistribute it"
_print " For the latest sourcecode go to <http://dyne.org/software/tomb>"
echo
option_is_set -v && {
local langwas=$LANG
LANG=en
_print " This source code is distributed in the hope that it will be useful,"
_print " but WITHOUT ANY WARRANTY; without even the implied warranty of"
_print " MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
LANG=$langwas
_print " When in need please refer to <http://dyne.org/support>."
echo
_print "System utils:"
echo
cat <<EOF
`zsh --version`
`sudo -V | head -n1`
`cryptsetup --version`
`pinentry --version | head -n1`
`findmnt -V`
`gpg --version | head -n1` - key forging algorithms (GnuPG symmetric ciphers):
`list_gnupg_ciphers`
EOF
echo
_print "Optional utils:"
echo
_list_optional_tools version
return 0
}
usage
;;
# Reject unknown command and suggest help
*)
_warning "Command \"::1 subcommand::\" not recognized." $subcommand
_message "Try -h for help."
return 1
;;
esac
return $?
}
# }}}
# {{{ Run
main "$@" || exit $? # Prevent `source tomb source` from exiting
# }}}
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