#!/usr/bin/env zsh # # Tomb, the Crypto Undertaker # # A commandline tool to easily operate encryption of secret data # # {{{ License # Copyright (C) 2007-2023 Dyne.org Foundation # # Tomb is designed, written and maintained by Denis Roio # # 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 . # }}} - License # {{{ Global variables typeset VERSION="2.10.0" typeset DATE="Sep/2023" 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) PINENTRY=(pinentry) SUDO=(sudo) # 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 SWISH=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 $? ;; *) _failure "Super user execution not supported: ::1 sudo::" "`option_value --sudo`" ;; esac else local msg="[sudo] Enter password for user ::1 user:: to gain superuser privileges" command -v gettext 1>/dev/null 2>/dev/null && msg="$(gettext -s "$msg")" msg=${(S)msg//::1*::/$USER} [[ -n "$SUDO_ASKPASS" ]] && local sudo_askpass="--askpass" sudo $sudo_askpass -p " $msg " ${@} return $? 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 # Detach loop devices for l in $TOMBLOOPDEVS; do _sudo losetup -d "$l" done 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: : _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 $? in 0|2) # No, or encrypted swap return 0 ;; *) # Unencrypted swap _failure "Operation aborted." ;; esac fi } pinentry_assuan_getpass() { # simply prints out commands for pinentry's stdin to activate the # password dialog cat <$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 $TOMBPATH | sha256sum -z` lo_mount # fills TOMBLOOP with next loop TOMBMAPPER="tomb.$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 to be lomounted lo_mount() { 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 # allocates the next loopback for our file _sudo losetup -f "$tpath" || _failure "Loopback mount failed: ::1 path:: on ::2 loop::" "$tpath" $TOMBLOOP TOMBLOOPDEVS+=("$TOMBLOOP") # add to array of lodevs used return 0 } # print out latest loopback mounted lo_new() { print - "${TOMBLOOPDEVS[${#TOMBLOOPDEVS}]}" } # $1 is the path to the lodev to be preserved after quit lo_preserve() { _verbose "lo_preserve on ::1 path::" $1 # remove the lodev from the tomb_lodevs array TOMBLOOPDEVS=("${(@)TOMBLOOPDEVS:#$1}") } # 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 ." } # 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 swish-e 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 pinentry sudo 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 # 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 Swish-E file content indexer command -v swish-e 1>/dev/null 2>/dev/null || SWISH=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 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) _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 $TOMBKEYFILE $cipher >$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 ]] && { destkey="/dev/stdout" # 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 decloakify $textfile $cipher >$destkey r=$? # Report to the user [[ "$destkey" = "/dev/stdout" ]] && 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 $filesystem." } lo_mount "$TOMBPATH" _verbose "Loop mounted on ::1 mount point::" $TOMBLOOP _message "Checking if the tomb is empty (we never step on somebody else's bones)." _sudo cryptsetup isLuks ${TOMBLOOP} 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 ${TOMBLOOP} [[ $? == 0 ]] || { _warning "cryptsetup luksFormat returned an error." _failure "Operation aborted." } _cryptsetup --cipher ${cipher} --hash sha512 luksOpen ${TOMBLOOP} 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 $tombpath lo_mount "$TOMBPATH" _sudo cryptsetup isLuks ${TOMBLOOP} # 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 ${TOMBLOOP} ${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 "$TOMBLOOP" "$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::" "$tombmount" done lo_mount "$TOMBPATH" _sudo cryptsetup isLuks ${TOMBLOOP} || { # 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 ${TOMBLOOP}`" 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 ${TOMBLOOP} ${TOMBMAPPER} [[ $? = 0 ]] || { _failure "Failure mounting the encrypted file." } # preserve the loopdev after exit lo_preserve "$TOMBLOOP" # 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 and loop _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 [|] [] _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 # The loop is taken care of in _endgame() _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 ::1 status:: tomb, may they all rest in peace." ${1:-open} } 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:: /dev/::2 tombloop:: device mounted (detach with losetup -d)" $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 # $1 is optional, to specify a tomb index_tombs() { { command -v updatedb 1>/dev/null 2>/dev/null } || { _failure "Cannot index tombs on this system: updatedb (mlocate/plocate) not installed." } updatedbver=`updatedb --version | grep '^updatedb'` [[ "$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" 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 } _message "Indexing ::1 tomb name:: filenames..." $tombname updatedb -l 0 -o "${tombmount}/.updatedb" -U "${tombmount}" # here we use swish to index file contents [[ $SWISH == 1 ]] && { _message "Indexing ::1 tomb name:: contents..." $tombname rm -f "${tombmount}/.swishrc" _message "Generating a new swish-e configuration file: ::1 swish conf::" "${tombmount}/.swishrc" cat < "${tombmount}/.swishrc" # index directives DefaultContents TXT* IndexDir "$tombmount" IndexFile "$tombmount/.swish" # exclude images FileRules filename regex /\.jp.?g/i FileRules filename regex /\.png/i FileRules filename regex /\.gif/i FileRules filename regex /\.tiff/i FileRules filename regex /\.svg/i FileRules filename regex /\.xcf/i FileRules filename regex /\.eps/i FileRules filename regex /\.ttf/i # exclude audio FileRules filename regex /\.mp3/i FileRules filename regex /\.ogg/i FileRules filename regex /\.wav/i FileRules filename regex /\.mod/i FileRules filename regex /\.xm/i # exclude video FileRules filename regex /\.mp4/i FileRules filename regex /\.avi/i FileRules filename regex /\.ogv/i FileRules filename regex /\.ogm/i FileRules filename regex /\.mkv/i FileRules filename regex /\.mov/i FileRules filename regex /\.flv/i FileRules filename regex /\.webm/i # exclude system FileRules filename is ok FileRules filename is lock FileRules filename is control FileRules filename is status FileRules filename is proc FileRules filename is sys FileRules filename is supervise FileRules filename regex /\.asc$/i FileRules filename regex /\.gpg$/i # pdf and postscript FileFilter .pdf pdftotext "'%p' -" FileFilter .ps ps2txt "'%p' -" # compressed files FileFilterMatch lesspipe "%p" /\.tgz$/i FileFilterMatch lesspipe "%p" /\.zip$/i FileFilterMatch lesspipe "%p" /\.gz$/i FileFilterMatch lesspipe "%p" /\.bz2$/i FileFilterMatch lesspipe "%p" /\.Z$/ # spreadsheets FileFilterMatch unoconv "-d spreadsheet -f csv --stdout %P" /\.xls.*/i FileFilterMatch unoconv "-d spreadsheet -f csv --stdout %P" /\.xlt.*/i FileFilter .ods unoconv "-d spreadsheet -f csv --stdout %P" FileFilter .ots unoconv "-d spreadsheet -f csv --stdout %P" FileFilter .dbf unoconv "-d spreadsheet -f csv --stdout %P" FileFilter .dif unoconv "-d spreadsheet -f csv --stdout %P" FileFilter .uos unoconv "-d spreadsheet -f csv --stdout %P" FileFilter .sxc unoconv "-d spreadsheet -f csv --stdout %P" # word documents FileFilterMatch unoconv "-d document -f txt --stdout %P" /\.doc.*/i FileFilterMatch unoconv "-d document -f txt --stdout %P" /\.odt.*/i FileFilterMatch unoconv "-d document -f txt --stdout %P" /\.rtf.*/i FileFilterMatch unoconv "-d document -f txt --stdout %P" /\.tex$/i # native html support IndexContents HTML* .htm .html .shtml IndexContents XML* .xml EOF swish-e -c "${tombmount}/.swishrc" -S fs -v3 } _message "Search index updated." done return 0 } search_tombs() { { command -v locate 1>/dev/null 2>/dev/null } || { _failure "Cannot index tombs on this system: updatedb (mlocate/plocate) not installed." } updatedbver=`updatedb --version | grep '^updatedb'` [[ "$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 swish-e to search over contents [[ $SWISH == 1 && -r "$tombmount/.swish" ]] && { _message "Searching contents in tomb ::1 tomb name::" $tombname swish-e -w ${@} -f "$tombmount/.swish" -H0 } } || { _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" = "$oldtombsize" ]]; then _message "Tomb seems resized already, operating filesystem stretch" else _failure "The new size must be greater then old tomb size." fi lo_mount "$TOMBPATH" _message "opening tomb" _cryptsetup luksOpen ${TOMBLOOP} ${TOMBMAPPER} || { _failure "Failure mounting the encrypted file." } _sudo cryptsetup resize "${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 binded dirs and close them bind_tombs=(`list_tomb_binds $tombname "$tombmount"`) for b in ${(f)"$(list_tomb_binds $tombname "$tombmount")"}; 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::" $mapper # Normally the loopback device is detached when unused [[ -e "/dev/$tombloop" ]] && { _sudo losetup -d "/dev/$tombloop" || _verbose "/dev/$tombloop was already closed." } _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 # returns a list of process UIDs, one per line local mounted_tombs i local pnum puid pcmd powner found found=0 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]}" tombname=${i[(ws:;:)5]} for pnum in ${(f)"$(_sudo lsof -t +D "$tombmount")"}; do found=$(($found + 1)) _verbose "process found: $pnum" puid=$(cat /proc/${pnum}/loginuid) pcmd=$(cat /proc/${pnum}/cmdline) powner=`_get_username $puid` _verbose "process found: $pnum $pcmd ($powner)" _message "::1 tombname:: ::2 cmd:: (::3 owner::)" \ $tombname $pcmd $powner done done fi _message "::1 foundproc:: running processes found inside ::2 numtombs:: open tombs" \ $found ${#mounted_tombs} 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[help]="" 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" $VERSION echo _print " Copyright (C) 2007-2021 Dyne.org Foundation, License GNU GPL v3+" _print " This is free software: you are free to change and redistribute it" _print " For the latest sourcecode go to " echo option_is_set -v && { local langwas=$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 ." echo _print "System utils:" echo cat <