#!/bin/zsh # # Tomb, the Crypto Undertaker # # A commandline tool to easily operate encryption of secret data # # Homepage on: [tomb.dyne.org](http://tomb.dyne.org) # # In Emacs, you can use C-c @ C-q to (un)fold code using folding.el # {{{ License # Copyright (C) 2007-2014 Dyne.org Foundation # # Tomb is designed, written and maintained by Denis Roio # # With contributions by Anathema, Boyska, Hellekin O. Wolf and GDrooid # # Testing and reviews are contributed by Dreamer, Shining, Mancausoft, # Asbesto Molesto and Nignux. # # Tomb's artwork is contributed by Jordi aka Mon Mort. # This source code is free software; you can redistribute it and/or # modify it under the terms of the GNU Public License as published by # the Free Software Foundation; either version 3 of the License, or # (at your option) any later version. # # This source code is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Please refer # to the GNU Public License for more details. # # You should have received a copy of the GNU Public License along with # this source code; if not, write to: Free Software Foundation, Inc., # 675 Mass Ave, Cambridge, MA 02139, USA. # }}} - License # {{{ Global variables typeset VERSION="2.0" typeset DATE="Nov/2014" typeset TOMBEXEC=$0 # Tomb is using some global variables set by the shell: # TMPPREFIX, UID, GID, PATH, TTY, USERNAME # You can grep 'global variable' to see where they are used. # Keep a reference of the original command line arguments typeset -a OLDARGS for arg in "${(@)argv}"; do OLDARGS+=("$arg"); done # Special command requirements typeset -a DD WIPE MKFS DD=(dd) WIPE=(rm -f) MKFS=(mkfs.ext3 -q -F -j -L) # load zsh regex module zmodload zsh/regex zmodload zsh/mapfile # Flag optional commands if available (see _ensure_dependencies()) typeset -i KDF=1 typeset -i STEGHIDE=1 typeset -i RESIZER=1 typeset -i SWISH=1 typeset -i QRENCODE=1 # Default mount options typeset MOUNTOPTS="rw,noatime,nodev" # Makes glob matching case insensitive unsetopt CASE_MATCH typeset -AH OPTS # Command line options (see main()) # Command context (see _whoami()) typeset -H _USER # Running username typeset -Hi _UID # Running user identifier typeset -Hi _GID # Running user group identifier typeset -H _TTY # Connected input terminal # Tomb context (see _plot()) typeset -H TOMBPATH # Full path to the tomb typeset -H TOMBDIR # Directory where the tomb is typeset -H TOMBFILE # File name of the tomb typeset -H TOMBNAME # Name of the tomb # Tomb secrets typeset -H TOMBKEY # Encrypted key contents (see forge_key(), recover_key()) typeset -H TOMBKEYFILE # Key file (ditto) typeset -H TOMBSECRET # Raw deciphered key (see forge_key(), gpg_decrypt()) typeset -H TOMBPASSWORD # Raw tomb passphrase (see gen_key(), ask_key_password()) typeset -H TOMBTMP # Filename of secure temp just created (see _tmp_create()) typeset -aH TOMBTMPFILES # Keep track of temporary files typeset -aH TOMBLOOPDEVS # Keep track of used loop devices # Make sure sbin is in PATH (man zshparam) path+=( /sbin /usr/sbin ) # For gettext export TEXTDOMAIN=tomb # }}} # {{{ Safety functions # Cleanup anything sensitive before exiting. _endgame() { # Prepare some random material to overwrite vars local rr="$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 $TOMBLOOPDEVS; do losetup -d "$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 } _cat() { local -a _arr; # read file using mapfile, newline fix _arr=("${(f@)${mapfile[${1}]%$’\n’}}"); print "$_arr" } # 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 global variables typeset -gi _GID _UID typeset -g _TTY _USER # Set username from UID or environment [[ -n $SUDO_USER ]] && _USER=$SUDO_USER [[ -z $_USER && -n $USERNAME ]] && _USER=$USERNAME [[ -z $_USER ]] && _USER=$(id -u) # 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 we can [[ 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=$(awk -F: "/$_USER/ { print \$6 }" /etc/passwd 2>/dev/null) [[ $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 } # Ensure temporary files remain in RAM # Set global variable TMPPREFIX # TODO: configure which tmp dir to use from a cli flag _ensure_safe_memory check_shm() { local shmprefix="" # Path prefix for safe temporary files # Set $shmprefix to something sensible [[ -z $shmprefix && -k "/dev/shm" ]] \ && shmprefix="/dev/shm" || shmprefix="/run/shm" _whoami # Set _UID and _GID for later # Mount the tmpfs if the OS doesn't already [[ -k $shmprefix ]] || { mkdir -p $shmprefix/$_UID || { _failure "Fatal error creating a directory for temporary files" } mount -t tmpfs tmpfs $shmprefix/$_UID \ -o nosuid,noexec,nodev,mode=0700,uid=$_UID,gid=$_GID [[ $? == 0 ]] || { _failure "Cannot mount tmpfs in ::1 shm path::" $shmprefix } } # Ensure all temporary files go into a user-specific directory for # additional safety mkdir -m 0700 -p $shmprefix/$_UID || { _failure "Fatal error creating a directory for temporary files" } # Set a global environment variable to ensure zsh will use that # directory in RAM to keep temporary files by setting an. They # will be created on demand and deleted as soon as the function # using them ends. TMPPREFIX="$shmprefix/$_UID/$RANDOM$RANDOM." return 0 } # Define sepulture's plot (setup tomb-related arguments) # Synopsis: _plot /path/to/the.tomb _plot() { # We set global variables typeset -g TOMBPATH TOMBDIR TOMBFILE TOMBNAME TOMBPATH="$1" TOMBDIR=$(dirname $TOMBPATH) TOMBFILE=$(basename $TOMBPATH) # The tomb name is TOMBFILE without an extension. # It can start with dots: ..foo.tomb -> ..foo TOMBNAME="${TOMBFILE%\.[^\.]*}" [[ -z $TOMBNAME ]] && { _failure "Tomb won't work without a TOMBNAME." } # Normalize tomb name TOMBFILE="$TOMBNAME.tomb" # Normalize tomb path TOMBPATH="$TOMBDIR/$TOMBFILE" } # Provide a random filename in shared memory _tmp_create() { tfile="${TMPPREFIX}${RANDOM}" # Temporary file touch $tfile [[ $? == 0 ]] || { _failure "Fatal error creating a temporary file: ::1 temp file::" $tfile } chown $_UID:$_GID $tfile && chmod 0600 $tfile [[ $? == 0 ]] || { _failure "Fatal error setting permissions on temporary file: ::1 temp file::" $tfile } _verbose "Created tempfile: ::1 temp file::" $tfile TOMBTMP="$tfile" TOMBTMPFILES+=("$tfile") return 0 } # Check if swap is activated # Return 0 if NO swap is used, 1 if swap is used. # Return 1 if any of the swaps is not encrypted. # Return 2 if swap(s) is(are) used, but ALL encrypted. # Use _check_swap in functions, that will call this function but will # exit if unsafe swap is present. _ensure_safe_swap() { local -i r=1 # Return code: 0 no swap, 1 unsafe swap, 2 encrypted local -a swaps # List of swap partitions local bone is_crypt swaps="$(awk '/^\// { print $1 }' /proc/swaps 2>/dev/null)" [[ -z "$swaps" ]] && return 0 # No swap partition is active for s in $=swaps; do bone=$(sudo file $s) if [[ "$bone" =~ "swap file" ]]; then # It's a regular (unencrypted) swap file r=1 break elif [[ "$bone" =~ "symbolic link" ]]; then # Might link to a block r=1 [[ "/dev/mapper" == "${s%/*}" ]] || { break } is_crypt=$(sudo dmsetup status "$s" | awk '/crypt/ {print $3}') [[ $is_crypt == "crypt" ]] && { r=2 } elif [[ "$bone" =~ "block special" ]]; then # It's a block r=1 is_crypt=`sudo dmsetup status "$s" | awk '/crypt/ {print $3}'` [[ $is_crypt == "crypt" ]] && { r=2 } || { break } fi done _warning "An active swap partition is detected, this poses security risks." if [[ $r -eq 2 ]]; then _success "All your swaps are belong to crypt. Good." else _warning "You can deactivate all swap partitions using the command:" _warning " swapoff -a" _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, and not to 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 return 1 _failure "Operation aborted." ;; esac fi } # Ask user for a password # Wraps around the pinentry command, from the GnuPG project, as it # provides better security and conveniently use the right toolkit. ask_password() { local description=$1 local title=${2:-Enter tomb password.} local gtkrc="share/themes/tomb/gtk-2.0-key/gtkrc" local output # Force pinentry to use a custom icon by overriding the GTK theme # temporarily. for prefix in /usr/local /usr; do [[ -r "$prefix/$gtkrc" ]] && { GTK2_RC="$prefix/$gtkrc" break } done output=`cat </dev/null | tail -n +7 OPTION ttyname=$TTY OPTION lc-ctype=$LANG SETTITLE $title SETDESC $description SETPROMPT Password: GETPIN EOF` # Return 1 on error [[ `tail -n1 <<<$output` =~ ERR ]] && return 1 # Print out the typed password and return 0 head -n1 <<<$output | awk '/^D / { sub(/^D /, ""); print }' return 0 } # Drop privileges exec_as_user() { if ! [ $SUDO_USER ]; then exec $@[@] return $? fi _verbose "exec_as_user '::1 user::': ::2::" $SUDO_USER ${(f)@} sudo -u $SUDO_USER "${@[@]}" return $? } # Escalate privileges check_priv() { if [ $UID != 0 ]; then _verbose "Using sudo for root execution of '::1 exec:: ::2 args::'." $TOMBEXEC ${(f)OLDARGS} # check if sudo has a timestamp active sudok=false if ! option_is_set --sudo-pwd; then if [ $? != 0 ]; then # if not then ask a password cat </dev/null | awk '/^D / { sub(/^D /, ""); print }' | sudo -S -v OPTION ttyname=$TTY OPTION lc-ctype=$LANG SETTITLE Super user privileges required SETDESC Sudo execution of Tomb ${OLDARGS[@]} SETPROMPT Insert your USER password: GETPIN EOF fi else _verbose "Escalating privileges using sudo-pwd." sudo -S -v <<<`option_value --sudo-pwd` fi sudo "${TOMBEXEC}" -U "${UID}" -G "${GID}" -T "${TTY:-SSH_TTY}" "${(@)OLDARGS}" exit $? fi # are we root already # make sure necessary kernel modules are loaded modprobe dm_mod modprobe dm_crypt return 0 } # 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." } # Tomb file must be a readable, writable, not-empty regular file. [[ ! -r "$1" ]] && { _failure "Tomb file not found: ::1 tomb file::" $1 } [[ ! -f "$1" ]] && { _failure "Tomb file is not a regular file: ::1 tomb file::" $1 } [[ ! -s "$1" ]] && { _failure "Tomb file is empty (zero length): ::1 tomb file::" $1 } [[ ! -w "$1" ]] && { _failure "Tomb file is not writable: ::1 tomb file::" $1 } # TODO: split the rest of that function out. # We already have a valid tomb, now we're checking # whether we can alter it. # Tomb file may be a LUKS FS (or we are creating it) [[ "`file $1`" =~ "luks encrypted file" ]] || { _warning "File is not yet a tomb: ::1 tomb file::" $1 } _plot $1 # Set TOMB{PATH,DIR,FILE,NAME} # Tomb cannot be already mounted (or we cannot alter it) [[ "`mount -l`" -regex-match "${TOMBFILE}.*\[$TOMBNAME\]$" ]] && { _failure "Tomb is currently in use: ::1 tomb name::" $TOMBNAME } _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 _nstloop=`losetup -f` [[ $? = 0 ]] || { _warning "Loop mount of volumes is not possible on this machine, this error" _warning "often occurs on VPS and kernels that don't provide the loop module." _warning "It is impossible to use Tomb on this machine at this conditions." _failure "Operation aborted." } losetup -f "$tpath" # allocates the next loopback for our file TOMBLOOPDEVS+=("$_nstloop") # add to array of lodevs used return 0 } # print out latest loopback mounted lo_new() { print - "${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]" _print "\000" _print "Commands:" _print "\000" _print " // Creation:" _print " dig create a new empty TOMB file of size -s in MB" _print " forge create a new KEY file and set its password" _print " lock installs a lock on a TOMB to use it with KEY" _print "\000" _print " // Operations on tombs:" _print " open open an existing TOMB" _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 " 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)" } _print "\000" _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)" _print "\000" [[ $QRENCODE == 1 ]] && { _print " // Backup on paper:" _print " engrave makes a QR code of a KEY to be saved on paper" } _print "\000" [[ $STEGHIDE == 1 ]] && { _print " // Steganography:" _print " bury hide a KEY inside a JPEG image (for use with -k)" _print " exhume extract a KEY from a JPEG image (prints to stout)" } _print "\000" _print "Options:" _print "\000" _print " -s size of the tomb file when creating/resizing one (in MB)" _print " -k path to the key to be used ('-k -' to read from stdin)" _print " -n don't process the hooks found in tomb" _print " -o mount options used to open (default: rw,noatime,nodev)" _print " -f force operation (i.e. even if swap is active)" [[ $KDF == 1 ]] && { _print " --kdf generate passwords armored against dictionary attacks" } _print "\000" _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" _print "\000" _print "For more informations 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]}" } # Messaging function with pretty coloring function _msg() { local msg="$2" hash gettext && msg="$(gettext -s "$2")" for i in $(seq 3 ${#}); do msg=${(S)msg//::$(($i - 2))*::/$*[$i]} done local command="print -P" local progname="$fg[magenta]${TOMBEXEC##*/}$reset_color" local message="$fg_bold[normal]$fg_no_bold[normal]$msg$reset_color" local -i returncode case "$1" in inline) command+=" -n"; pchars=" > "; pcolor="yellow" ;; message) pchars=" . "; pcolor="white"; message="$fg_no_bold[$pcolor]$msg$reset_color" ;; verbose) pchars="[D]"; pcolor="blue" ;; success) pchars="(*)"; pcolor="green"; message="$fg_no_bold[$pcolor]$msg$reset_color" ;; warning) pchars="[W]"; pcolor="yellow"; message="$fg_no_bold[$pcolor]$msg$reset_color" ;; failure) pchars="[E]"; pcolor="red"; message="$fg_no_bold[$pcolor]$msg$reset_color" returncode=1 ;; print) progname="" ;; *) pchars="[F]"; pcolor="red" message="Developer oops! Usage: _msg MESSAGE_TYPE \"MESSAGE_CONTENT\"" returncode=127 ;; esac ${=command} "${progname} $fg_bold[$pcolor]$pchars$reset_color ${message}$color[reset_color]" >&2 return $returncode } function _message say() { local notice="message" [[ "$1" = "-n" ]] && shift && notice="inline" option_is_set -q || _msg "$notice" $@ return 0 } function _verbose xxx() { option_is_set -D && _msg verbose $@ return 0 } function _success yes() { option_is_set -q || _msg success $@ return 0 } function _warning no() { option_is_set -q || _msg warning $@ return 1 } function _failure die() { typeset -i exitcode=${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 } # Print out progress to inform GUI caller applications (--batch mode) progress() { # $1 is "what is progressing" # $2 is "percentage" # $3 is (eventually blank) status # Example: if creating a tomb, it could be sth like # progress create 0 filling with random data # progress create 40 generating key # progress keygen 0 please move the mouse # progress keygen 30 please move the mouse # progress keygen 60 please move the mouse # progress keygen 100 key generated # progress create 80 please enter password # progress create 90 formatting the tomb # progress create 100 tomb created successfully if ! option_is_set --batch; then return fi print "[m][P][$1][$2][$3]" >&2 } # Check 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_bin() { # The messages system requires gettext command -v gettext >& - || { print "Missing required dependency: gettext. Please install it." exit 1 } # Check for required programs for req in cryptsetup pinentry sudo gpg; do command -v $req >& - || { _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 # Which dd command to use command -v dcfldd >& - && DD=(dcfldd statusinterval=1) # Which wipe command to use command -v wipe >& - && WIPE=(wipe -f -s) # Check for filesystem creation programs command -v mkfs.ext4 >& - && MKFS=(mkfs.ext4 -q -F -j -L) # Check for steghide command -v steghide >& - || STEGHIDE=0 # Check for resize command -v e2fsck resize2fs >& - || RESIZER=0 # Check for KDF auxiliary tools command -v tomb-kdb-pbkdf2 >& - || KDF=0 # Check for Swish-E file content indexer command -v swish-e >& - || SWISH=0 # Check for QREncode for paper backups of keys command -v qrencode >& - || QRENCODE=0 } # }}} - Commandline interaction # {{{ Key operations # $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 [[ -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 } [[ $key =~ "BEGIN PGP" ]] && { _message "Key is valid." return 0 } return 1 } # $1 is a string containing an encrypted key _tomb_key_recover recover_key() { local key="$1" # Unique argument is an encrypted key _warning "Attempting key recovery." TOMBKEY="" # Reset global variable [[ $key =~ "_KDF_" ]] && TOMBKEY+="`print - $key | $head -n 1`\n" TOMBKEY+="-----BEGIN PGP MESSAGE-----\n" TOMBKEY+="$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." } [[ $keyfile == "-" ]] && { _verbose "load_key reading from stdin." _message "Waiting for the key to be piped from stdin... " TOMBKEYFILE=stdin TOMBKEY=$(cat) } || { _verbose "load_key argument: ::1 key file::" $keyfile [[ -r $keyfile ]] || _failure "Key not found, specify one using -k." TOMBKEYFILE=$keyfile TOMBKEY="${mapfile[$TOMBKEYFILE]}" } _verbose "load_key: ::1 key::" $TOMBKEYFILE is_valid_key $TOMBKEY || { _warning "The key seems invalid or its format is not known by this version of Tomb." _tomb_key_recover $TOMBKEY } # Declared TOMBKEYFILE (path) # Declared TOMBKEY (contents) return 0 } # takes two args just like get_lukskey # prints out the decrypted content # contains tweaks for different gpg versions gpg_decrypt() { # fix for gpg 1.4.11 where the --status-* options don't work ;^/ local gpgver=$(gpg --version --no-permission-warning | awk '/^gpg/ {print $3}') local gpgpass="$1\n$TOMBKEY" [[ $gpgver == "1.4.11" ]] && { _verbose "GnuPG is version 1.4.11 - adopting status fix." TOMBSECRET=`print - "$gpgpass" | \ gpg --batch --passphrase-fd 0 --no-tty --no-options"` ret=$? unset gpgpass } || { # using status-file in gpg != 1.4.11 # TODO: use mkfifo _tmp_create statusfile=$TOMBTMP TOMBSECRET=`print - "$gpgpass" | \ gpg --batch --passphrase-fd 0 --no-tty --no-options \ --status-fd 2 --no-mdc-warning --no-permission-warning \ --no-secmem-warning 2> $statusfile` unset gpgpass ret=1 [[ "${mapfile[$statusfile]}" =~ "DECRYPTION_OKAY" ]] && { ret=0 } } 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="$1" exhumedkey="" firstline=$(head -n1 <<< $TOMBKEY) # key is KDF encoded if [[ $firstline =~ '^_KDF_' ]]; then _verbose "KDF: ::1 kdf::" $(cut -d_ -f 3 <<<$firstline) case `cut -d_ -f 3 <<<$firstline` in pbkdf2sha1) pbkdf2_param=`cut -d_ -f 4- <<<$firstline | tr '_' ' '` _password=$(tomb-kdb-pbkdf2 ${=pbkdf2_param} 2>/dev/null <<<$_password) ;; *) _failure "No suitable program for KDF ::1 program::." $(cut -f 3 <<<$firstline) unset _password return 1 ;; esac # key needs to be exhumed from an image elif [[ -r $TOMBKEYFILE && $(file $TOMBKEYFILE) =~ "JP.G" ]]; then exhume_key $TOMBKEYFILE "$_password" 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()." } _message "A password is required to use key ::1 key::" $TOMBKEYFILE passok=0 tombpass="" if [[ "$1" = "" ]]; then for c in 1 2 3; do if [[ $c == 1 ]]; then tombpass=$(exec_as_user ${TOMBEXEC} askpass \ "Insert password to use key: $TOMBKEYFILE") else tombpass=$(exec_as_user ${TOMBEXEC} askpass \ "Insert password to use key: $TOMBKEYFILE (attempt $c)") fi if [[ $? != 0 ]]; then _warning "User aborted password dialog." return 1 fi get_lukskey "$tombpass" if [ $? = 0 ]; then passok=1; _message "Password OK." break; fi 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::" $tombpass get_lukskey "$tombpass" if [ $? = 0 ]; then passok=1; _message "Password OK."; fi fi # print the password out in case caller needs to know it [[ $passok == 1 ]] || return 1 TOMBPASSWORD=$tombpass return 0 } # 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 _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." _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::" $tombpwd gen_key "$tombpwd" >> "$tmpnewkey" } || { gen_key >> "$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 _success "Your passphrase was successfully updated." return 0 } # takes care to encrypt a key # honored options: --kdf --tomb-pwd -o gen_key() { # $1 the password to use, if not set then ask user # -o is the --cipher-algo to use (string taken by GnuPG) local algopt="`option_value -o`" local algo="${algopt:-AES256}" # here user is prompted for key password tombpass="" tombpasstmp="" if [ "$1" = "" ]; then while true; do # 3 tries to write two times a matching password tombpass=`exec_as_user ${TOMBEXEC} askpass "Type the new password to secure your key"` if [[ $? != 0 ]]; then _failure "User aborted." fi if [ -z $tombpass ]; then _warning "You set empty password, which is not possible." continue fi tombpasstmp=$tombpass tombpass=`exec_as_user ${TOMBEXEC} askpass "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="$1" _verbose "gen_key takes tombpass from CLI argument: ::1 tomb pass::" $tombpass 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 _failure "Wrong argument for --kdf: must be an integer number (iteration seconds)." fi # --kdf takes one parameter: iter time (on present machine) in seconds local -i microseconds microseconds=$(( itertime * 10000 )) _success "Using KDF, iterations: ::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" } } print $header # TODO: check result of gpg operation cat <& - || _failure "gpg (GnuPG) is not found, Tomb cannot function without it." ciphers=(`gpg --version | awk ' BEGIN { ciphers=0 } /^Cipher:/ { gsub(/,/,""); sub(/^Cipher:/,""); print; ciphers=1; next } /^Hash:/ { ciphers=0 } { if(ciphers==0) { next } else { gsub(/,/,""); print; } } '`) 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 _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 its not strictly necessary (and having different # password would enhance security). Nevertheless here we prefer # usability. { option_is_set --tomb-pwd } && { local tombpwd="`option_value --tomb-pwd`" _verbose "tomb-pwd = ::1 tomb pass::" $tombpwd ask_key_password "$tombpwd" } || { ask_key_password } [[ $? != 0 ]] && { _warning "Wrong password supplied." _failure "You shall not bury a key whose password is unknown to you." } # We omit armor strings since having them as constants can give # ground to effective attacks on steganography print - "$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() { [[ "$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) # 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=$(exec_as_user ${TOMBEXEC} askpass \ "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 } return $r } # Produces a printable image of the key contents so that it can be # backuped on paper and hidden in books etc. engrave_key() { _load_key # Try loading key from option -k and set TOMBKEYFILE local keyname=$(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 sizemegabytes # # 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() { local tombpath="$1" # Path to tomb # Require the specification of the size of the tomb (-s) in MB local -i tombsize=$(option_value -s) _message "Commanded to dig tomb ::1 tomb path::" $tombpath [[ -n "$tombpath" ]] || _failure "Missing path to tomb" [[ -n "$tombsize" ]] || _failure "Size argument missing, use -s" [[ $tombsize == <-> ]] || _failure "Size must be an integer (megabytes)" [[ $tombsize -ge 10 ]] || _failure "Tombs can't be smaller than 10 megabytes" _check_swap # Ensure the available memory is safe to use _plot $tombpath # Set TOMB{PATH,DIR,FILE,NAME} [[ -e $TOMBPATH ]] && { _warning "A tomb exists already. I'm not digging here:" _warning " $(ls -lh $TOMBPATH)" return 1 } _success "Creating a new tomb in ::1 tomb path::" $TOMBPATH _message "Generating ::1 tomb file:: of ::2 size::MiB" $TOMBFILE $tombsize # Ensure that file permissions are safe even if interrupted touch $TOMBPATH chmod 0600 $TOMBPATH chown $_UID:$_GID $TOMBPATH _verbose "Data dump using ::1:: from /dev/urandom" ${DD[1]} ${=DD} if=/dev/urandom bs=1048576 count=$tombsize of=$TOMBPATH [[ $? == 0 && -e $TOMBPATH ]] && { _message " $(ls -lh $TOMBPATH)" } || { _warning "Error creating the tomb ::1 tomb path::" $TOMBPATH _failure "Operation aborted." } _success "Done digging ::1 tomb name::" $TOMBNAME _message "Your tomb is not yet ready, you need to forge a key and lock it:" _message "tomb forge ::1 tomb path::.key" $TOMBPATH _message "tomb lock ::1 tomb path:: -k ::1 tomb path::.key" $TOMBPATH return 0 } 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 [[ -r $HOME/.gnupg/pubring.gpg ]] || { mkdir -m 0700 $HOME/.gnupg touch $HOME/.gnupg/pubring.gpg } # Do not overwrite any files accidentally [[ -r "$destkey" ]] && { _warning "Forging this key would overwrite an existing file. Operation aborted." _failure "`ls -lh $destkey`" } # Update algorithm if it was passed on the command line with -o { option_is_set -o } && { algopt="$(option_value -o)" } [[ -n "$algopt" ]] && algo=$algopt _message "Commanded to forge key ::1 key:: with cipher algorithm ::2 algorithm::" \ $destkey $algo TOMBKEYFILE="$destkey" # Set global variable _message "This operation takes time, keep using this computer on other tasks," _message "once done you will be asked to choose a password for your tomb." _message "To make it faster you can move the mouse around." _message "If you are on a server, you can use an Entropy Generation Daemon." # Use /dev/random as the entropy source, unless --use-random is specified local random_source=/dev/random { option_is_set --use-urandom } && random_source=/dev/urandom _verbose "Data dump using ::1:: from ::2 source::" ${DD[1]} $random_source TOMBSECRET=$(${=DD} bs=1 count=256 if=$random_source) [[ $? == 0 ]] || { _warning "Cannot generate encryption key." _failure "Operation aborted." } # Here the global variable TOMBSECRET contains the naked secret _success "Choose the password of your key: ::1 tomb key::" $TOMBKEYFILE _message "(You can also change it later using 'tomb passwd'.)" # _user_file $TOMBKEYFILE touch $TOMBKEYFILE chown $_UID:$_GID $TOMBKEYFILE chmod 0600 $TOMBKEYFILE tombname="$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::" $tombpwd gen_key "$tombpwd" >> $TOMBKEYFILE } || { 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 "--" umount ${keytmp} rm -r $keytmp _failure "Operation aborted." } _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 # # Lock the given tomb with the given key file, in fact formatting the # loopback volume as a LUKS device. it take arguments as the LUKS # cipher to be used lock_tomb_with_key() { 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 file.tomb.key" return 1 } _plot $tombpath _message "Commanded to lock tomb ::1 tomb file::" $TOMBFILE [[ -f $TOMBPATH ]] || { _failure "There is no tomb here. You have to it dig first." } _verbose "Tomb found: ::1 tomb path::" $TOMBPATH lo_mount $TOMBPATH nstloop=`lo_new` _verbose "Loop mounted on ::1 mount point::" $nstloop _message "Checking if the tomb is empty (we never step on somebody else's bones)." cryptsetup isLuks ${nstloop} if [ $? = 0 ]; then # is it a LUKS encrypted nest? then bail out and avoid reformatting it _warning "The tomb was already locked with another key." _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 -o if option_is_set -o; then cipher="`option_value -o`" else cipher="aes-xts-plain64:sha256" # old default was aes-cbc-essiv:sha256 # for more alternatives refer to cryptsetup(8) fi _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." print -n - $TOMBSECRET | \ cryptsetup --key-file - --batch-mode \ --cipher ${cipher} --key-size 256 --key-slot 0 \ luksFormat ${nstloop} [[ $? == 0 ]] || { _warning "cryptsetup luksFormat returned an error." _failure "Operation aborted." } print -n - $TOMBSECRET | \ cryptsetup --key-file - \ --cipher ${cipher} luksOpen ${nstloop} tomb.tmp [[ $? == 0 ]] || { _warning "cryptsetup luksOpen returned an error." _failure "Operation aborted." } _message "Formatting your Tomb with Ext3/Ext4 filesystem." ${=MKFS} $TOMBNAME /dev/mapper/tomb.tmp [[ $? == 0 ]] || { _warning "Tomb format returned an error." _warning "Your tomb ::1 tomb file:: may be corrupted." $TOMBFILE } # Sync 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 } # 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 nstloop=`lo_new` cryptsetup isLuks ${nstloop} # is it a LUKS encrypted nest? we check one more time [[ $? == 0 ]] || { _failure "Not a valid LUKS encrypted volume: ::1 volume::" $TOMBPATH } _load_key $tombkey # Try loading given key and set TOMBKEY and # TOMBKEYFILE local oldkey=$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::" $oldkeyfile # render the mapper mapdate=`date +%s` # save date of mount in minutes since 1970 mapper="tomb.$TOMBNAME.$mapdate.$(basename $nstloop)" # 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 -n - "$old_secret" | \ cryptsetup --key-file - luksOpen ${nstloop} ${mapper} [[ $? == 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 [[ $? == 0 ]] || { _failure "No valid password supplied for the new key." } new_secret=$TOMBSECRET # Danger zone: due to cryptsetup limitations, in setkey we need # to write the bare unencrypted key on the tmpfs. _tmp_create local newsecretfile=$TOMBTMP print -n - "$new_secret" >> $newsecretfile print -n - "$old_secret" | \ cryptsetup --key-file - luksChangeKey "$nstloop" "$newsecretfile" [[ $? == 0 ]] || _failure "Unexpected error in luksChangeKey." cryptsetup luksClose "${mapper}" || _failure "Unexpected error in luksClose." _success "Succesfully changed key for tomb: ::1 tomb file::" $TOMBFILE _message "The new key is: ::1 new key::" $TOMBKEYFILE return 0 } # }}} - Creation # {{{ Open # $1 = tombfile $2(optional) = mountpoint mount_tomb() { local tombpath="$1" # First argument is the path to the tomb [[ -n "$tombpath" ]] || _failure "No tomb name specified for opening." _message "Commanded to open tomb ::1 tomb name::" $1 _check_swap is_valid_tomb $tombpath # check file type (if its a Luks fs) [[ "`file $TOMBPATH`" =~ "luks encrypted file" ]] || { _warning "::1 tomb file:: is not a valid tomb file" $TOMBFILE _failure "Operation aborted." } _verbose "Tomb found: ::1 tomb path::" $TOMBPATH _load_key # Try loading new key from option -k and set TOMBKEYFILE tombmount=${2:-/media/$TOMBFILE} [[ -z "$2" ]] && { _message "Mountpoint not specified, using default: ::1 mount point::" $tombmount } # Check if its already open [[ "`mount -l`" -regex-match "${tombfile}.*\[$tombname\]$" ]] && { _warning "::1 tomb name:: is already open." $TOMBNAME _message "Here below its status is reported:" list_tombs $TOMBNAME return 0 } _success "Opening ::1 tomb file:: on ::2 mount point::" $TOMBFILE $tombmount lo_mount $TOMBPATH nstloop=`lo_new` cryptsetup isLuks ${nstloop} || { # 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="`cryptsetup luksDump ${nstloop}`" 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." } # save date of mount in minutes since 1970 mapdate=`date +%s` mapper="tomb.$TOMBNAME.$mapdate.$(basename $nstloop)" _verbose "dev mapper device: ::1 mapper::" $mapper _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 } && { 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." print -n - $TOMBSECRET | \ cryptsetup --key-file - luksOpen ${nstloop} ${mapper} [[ -r /dev/mapper/${mapper} ]] || { _failure "Failure mounting the encrypted file." } # preserve the loopdev after exit lo_preserve "$nstloop" # array: [ cipher, keysize, loopdevice ] tombstat=(`cryptsetup status ${mapper} | 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] _message "Checking filesystem via ::1::" $tombstat[3] fsck -p -C0 /dev/mapper/${mapper} _verbose "Tomb engraved as ::1 tomb name::" $TOMBNAME tune2fs -L $TOMBNAME /dev/mapper/${mapper} > /dev/null # we need root from here on mkdir -p $tombmount mount -o $MOUNTOPTS /dev/mapper/${mapper} ${tombmount} chown $_UID:$_GID ${tombmount} chmod 0711 ${tombmount} _success "Success opening ::1 tomb file:: on ::2 mount point::" $TOMBFILE $tombmount # print out when was opened the last time, by whom and where [[ -r ${tombmount}/.last ]] && { tombtty=$(_cat ${tombmount}/.tty | tr -d ' ') tombhost=$(_cat ${tombmount}/.host | tr -d ' ') tombuid=$(_cat ${tombmount}/.uid | tr -d ' ') tomblast=$(_cat ${tombmount}/.last | tr -d ' ') for e in ${(f@)mapfile[/etc/passwd]}; do [[ "$e" =~ ":$tombuid:" ]] && { tombuser="${e[(ws@:@)1]}" } done _message "Last visit by ::1 user::(::2 tomb build::) from ::3 tty:: on ::4 host::" $tombuser $tombuid $tombtty $tombhost _message "on date ::1 date::" $(date --date @$tomblast +%c) } # write down the UID and TTY that opened the tomb rm -f ${tombmount}/.uid print $_UID > ${tombmount}/.uid rm -f ${tombmount}/.tty print $_TTY > ${tombmount}/.tty # also the hostname rm -f ${tombmount}/.host hostname > ${tombmount}/.host # and the "last time opened" information # in minutes since 1970, this is printed at next open rm -f ${tombmount}/.last date +%s > ${tombmount}/.last # human readable: date --date=@"`cat .last`" +%c # process bind-hooks (mount -o bind of directories) # and post-hooks (execute on open) { option_is_set -n } || { exec_safe_bind_hooks ${tombmount} exec_safe_post_hooks ${tombmount} open } 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::" $mnt return 1 } typeset -Al maps # Maps of files and directories to mount typeset -al mounted # Track already mounted files and directories # better parsing for bind hooks checks for two separated words on # each line, using zsh word separator array subscript _bindhooks="${mapfile[${mnt}/bind-hooks]}" for h in ${(f)_bindhooks}; do s="${h[(w)1]}" d="${h[(w)2]}" [[ "$s" = "" ]] && { _warning "bind-hooks file is broken"; return 1 } [[ "$d" = "" ]] && { _warning "bind-hooks file is broken"; return 1 } maps+=($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 umount $dir; done return 1 } if [[ ! -r "$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 $dir else mount -o bind,$MOUNTOPTS $mnt/$dir $HOME/${maps[$dir]} \ && mounted+=("$HOME/${maps[$dir]}") fi done } # Execute automated actions configured in the tomb. # # Synopsis: exec_safe_post_hooks /path/to/mounted/tomb [open|close] # # If an executable file named 'post-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_post_hooks() { local mnt=$1 # First argument is where the tomb is mounted local act=$2 # Either 'open' or 'close' # Only run if post-hooks has the executable bit set [[ -x $mnt/post-hooks ]] || return # If the file starts with a shebang, run it. cat $mnt/post-hooks | head -n1 | grep '^#!\s*/' &> /dev/null [[ $? == 0 ]] && { _success "Post hooks found, executing as user ::1 user name::." $USERNAME exec_as_user $mnt/post-hooks $act $mnt } } # }}} - 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%%%} tombsince=`date --date=@${mapper[(ws:.:)3]} +%c` # find out who opens it from where [[ -r ${tombmount}/.tty ]] && { tombtty=$(_cat ${tombmount}/.tty | tr -d ' ') tombhost=$(_cat ${tombmount}/.host | tr -d ' ') tombuid=$(_cat ${tombmount}/.uid | tr -d ' ') for ee in ${(f@)mapfile[/etc/passwd]}; do [[ "$ee" =~ ":$tombuid:" ]] && { tombuser="${ee[(ws@:@)1]}" } done } { option_is_set --get-mountpoint } && { print $tombmount; continue } _message "::1 tombname:: open on ::2 tombmount:: using ::3 tombfsopts::" \ $tombname $tombmount $tombfsopts _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`) for h in ${mounted_hooks}; do _message "::1 tombname:: hooks ::2 hookname:: on ::3 hookdest::" \ $tombname "`basename ${h[(ws:;:)1]}`" ${h[(ws:;:)2]} done done } # Print out an array of mounted tombs (internal use) # Format is semi-colon separated list of attributes # if 1st arg is supplied, then list only that tomb # # String positions in the semicolon separated array: # # 1. full mapper path # # 2. mountpoint # # 3. filesystem type # # 4. mount options # # 5. tomb name list_tomb_mounts() { [[ -z "$1" ]] && { # list all open tombs mount -l \ | awk ' BEGIN { main="" } /^\/dev\/mapper\/tomb/ { if(main==$1) next; print $1 ";" $3 ";" $5 ";" $6 ";" $7 main=$1 } ' } || { # list a specific tomb mount -l \ | awk -vtomb="[$1]" ' BEGIN { main="" } /^\/dev\/mapper\/tomb/ { if($7!=tomb) next; if(main==$1) next; print $1 ";" $3 ";" $5 ";" $6 ";" $7 main=$1 } ' } } # list_tomb_binds # print out an array of mounted bind hooks (internal use) # format is semi-colon separated list of attributes # needs an argument: name of tomb whose hooks belong list_tomb_binds() { [[ -z "$1" ]] && { _failure "Internal error: list_tomb_binds called without argument." } # list bind hooks on util-linux 2.20 (Debian 7) mount -l \ | awk -vtomb="$1" ' BEGIN { main="" } /^\/dev\/mapper\/tomb/ { if($7!=tomb) next; if(main=="") { main=$1; next; } if(main==$1) print $1 ";" $3 ";" $5 ";" $6 ";" $7 } ' # list bind hooks on util-linux 2.17 (Debian 6) tombmount=`mount -l \ | awk -vtomb="$1" ' /^\/dev\/mapper\/tomb/ { if($7!=tomb) next; print $3; exit; }'` mount -l | grep "^$tombmount" \ | awk -vtomb="$1" ' /bind/ { print $1 ";" $3 ";" $5 ";" $6 ";" $7 }' } # }}} - Tomb list # {{{ Index and search # index files in all tombs for search # $1 is optional, to specify a tomb index_tombs() { { command -v updatedb >& - } || { _failure "Cannot index tombs on this system: updatedb (mlocate) not installed." } updatedbver=`updatedb --version | grep '^updatedb'` [[ "$updatedbver" =~ "GNU findutils" ]] && { _warning "Cannot use GNU findutils for index/search commands." } [[ "$updatedbver" =~ "mlocate" ]] || { _failure "Index command needs 'mlocate' to be installed." } _verbose "$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 >& - } && { 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..." $tombname _tmp_create local swishrc=$TOMBTMP cat < $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 _verbose "Using swish-e to create index." swish-e -c $swishrc -S fs -v3 rm -f $swishrc } _message "Search index updated." done } search_tombs() { { command -v locate >& - } || { _failure "Cannot index tombs on this system: updatedb (mlocate) not installed." } updatedbver=`updatedb --version | grep '^updatedb'` [[ "$updatedbver" =~ "GNU findutils" ]] && { _warning "Cannot use GNU findutils for index/search commands." } [[ "$updatedbver" =~ "mlocate" ]] || { _failure "Index command needs 'mlocate' to be installed." } _verbose "$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 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." } # }}} - 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:: megabytes." $1 $OPTS[-s] [[ -z "$tombpath" ]] && _failure "No tomb name specified for resizing." [[ ! -r $tombpath ]] && _failure "Cannot find ::1::" $tombpath newtombsize="`option_value -s`" [[ -z "$newtombsize" ]] && { _failure "Aborting operations: new size was not specified, use -s" } is_valid_tomb $tombpath # Set TOMB{PATH,DIR,FILE,NAME} _load_key # Try loading new key from option -k and set TOMBKEYFILE local oldtombsize=$(( `stat -c %s "$TOMBPATH" 2>/dev/null` / 1048576 )) local mounted_tomb=`mount -l | awk -vtomb="[$TOMBNAME]" '/^\/dev\/mapper\/tomb/ { if($7==tomb) print $1 }'` # Tomb must not be open [[ -z "$mounted_tomb" ]] || { _failure "Please close the tomb ::1 tomb name:: before trying to resize it." $TOMBNAME } # New tomb size must be specified [[ -n "$newtombsize" ]] || { _failure "You must specify the new size of ::1 tomb name::" $TOMBNAME } # New tomb size must be an integer [[ $newtombsize == <-> ]] || _failure "Size is not an integer." # Tombs can only grow in size [[ "$newtombsize" -gt "$oldtombsize" ]] || { _failure "The new size must be greater then old tomb size." } delta="$(( $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 } { option_is_set --tomb-pwd } && { tomb_pwd="`option_value --tomb-pwd`" _verbose "tomb-pwd = ::1 tomb pass::" $tomb_pwd ask_key_password "$tomb_pwd" } || { ask_key_password } [[ $? == 0 ]] || _failure "No valid password supplied." lo_mount "$TOMBPATH" nstloop=`lo_new` mapdate=`date +%s` mapper="tomb.$TOMBNAME.$mapdate.$(basename $nstloop)" print -n - $TOMBSECRET | \ cryptsetup --key-file - luksOpen ${nstloop} ${mapper} [[ -r /dev/mapper/${mapper} ]] || { _failure "Failure mounting the encrypted file." } cryptsetup resize "${mapper}" || { _failure "cryptsetup failed to resize ::1 mapper::" $mapper } e2fsck -p -f /dev/mapper/${mapper} || { _failure "e2fsck failed to check ::1 mapper::" $mapper } resize2fs /dev/mapper/${mapper} || { _failure "resize2fs failed to resize ::1 mapper::" $mapper } sleep 1 # needs to settle a bit # close and free the loop device cryptsetup luksClose "${mapper}" 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." } _message "Tomb close ::1::" $1 for t in ${mounted_tombs}; do mapper=`basename ${t[(ws:;:)1]}` tombname=${t[(ws:;:)5]} tombmount=${t[(ws:;:)2]} tombfs=${t[(ws:;:)3]} tombfsopts=${t[(ws:;:)4]} tombloop=${mapper[(ws:.:)4]} _verbose "Name: ::1 tomb name::" $tombname _verbose "Mount: ::1 mount point::" $tombmount _verbose "Mapper: ::1 mapper::" $mapper [[ -e "$mapper" ]] && { _warning "Tomb not found: ::1 tomb file::" $1 _warning "Please specify an existing tomb." return 0 } [[ -n $SLAM ]] && { _success "Slamming tomb ::1 tomb name:: mounted on ::2 mount point::" \ $tombname $tombmount _message "Kill all processes busy inside the tomb." { slam_tomb "$tombmount" } || { _failure "Cannot slam the tomb ::1 tomb name::" $tombname } } || { _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`) for b in ${bind_tombs}; do bind_mapper="${b[(ws:;:)1]}" bind_mount="${b[(ws:;:)2]}" _message "Closing tomb bind hook: ::1 hook::" $bind_mount umount $bind_mount || { [[ -n $SLAM ]] && { _success "Slamming tomb: killing all processes using this hook." slam_tomb "$bind_mount" [[ $? == 1 ]] && { _failure "Cannot slam the bind hook ::1 hook::" $bind_mount } umount $bind_mount } || { _warning "Tomb bind hook ::1 hook:: is busy, cannot close tomb." $bind_mount } } done # Execute post-hooks for eventual cleanup { option_is_set -n } || { exec_safe_post_hooks ${tombmount%%/} close } _verbose "Performing umount of ::1 mount point::" $tombmount umount ${tombmount} [[ $? = 0 ]] || { _warning "Tomb is busy, cannot umount!"; return 1 } # If we used a default mountpoint and is now empty, delete it [[ "$tombmount" == "/media/$tombname.tomb" ]] && { rmdir $tombmount } cryptsetup luksClose $mapper [[ $? == 0 ]] || { _failure "Error occurred in cryptsetup luksClose ::1 mapper::" $mapper } # Normally the loopback device is detached when unused [[ -e "/dev/$tombloop" ]] && losetup -d "/dev/$tombloop" [[ $? = 0 ]] || { _verbose "/dev/$tombloop was already closed." } _success "Tomb ::1 tomb name:: closed: your bones will rest in peace." $tombname done # loop across mounted tombs return 0 } # Kill all processes using the tomb slam_tomb() { # $1 = tomb mount point if [[ -z `fuser -m "$1" 2>/dev/null` ]]; then return 0 fi #Note: shells are NOT killed by INT or TERM, but they are killed by HUP for s in TERM HUP KILL; do _verbose "Sending ::1:: to processes inside the tomb:" $s if option_is_set -D; then ps -fp `fuser -m /media/a.tomb 2>/dev/null`| while read line; do _verbose $line done fi fuser -s -m "$1" -k -M -$s if [[ -z `fuser -m "$1" 2>/dev/null` ]]; then return 0 fi if ! option_is_set -f; then sleep 3 fi done return 1 } # }}} - Tomb close # {{{ Main routine main() { _ensure_dependencies # Check dependencies are present or bail out _ensure_safe_memory # Check available memory can be used safely local -A subcommands_opts ### Options configuration # # Hi, dear developer! Are you trying to add a new subcommand, or # to add some options? Well, keep in mind that option names are # global: they cannot bear a different meaning or behaviour across # subcommands. # # For example, "-s" means "size" and accepts one argument. If you # are tempted to add an alternate option "-s" (e.g., to mean # "silent", and that doesn't accept any argument) DON'T DO IT! # # There are two reasons for that: # I. Usability; users expect that "-s" is "size" # II. Option parsing WILL EXPLODE if you do this kind of bad # things (it will complain: "option defined more than once") # # If you want to use the same option in multiple commands then you # can only use the non-abbreviated long-option version like: # -force and NOT -f # main_opts=(q -quiet=q D -debug=D h -help=h v -version=v U: -uid=U G: -gid=G T: -tty=T -no-color -unsecure-dev-mode) subcommands_opts[__default]="" subcommands_opts[open]="f -force n -nohook=n k: -key=k -kdf: o: -ignore-swap -sudo-pwd: -tomb-pwd: " subcommands_opts[mount]=${subcommands_opts[open]} subcommands_opts[create]="" # deprecated, will issue warning subcommands_opts[forge]="f -force -ignore-swap k: -key=k -kdf: o: -tomb-pwd: -use-urandom " subcommands_opts[dig]="f -force -ignore-swap s: -size=s " subcommands_opts[lock]="f -force -ignore-swap k: -key=k -kdf: o: -sudo-pwd: -tomb-pwd: " subcommands_opts[setkey]="k: -key=k f -force -ignore-swap -kdf: -sudo-pwd: -tomb-old-pwd: -tomb-pwd: " subcommands_opts[engrave]="k: -key=k " subcommands_opts[passwd]="k: -key=k f -force -ignore-swap -kdf: -tomb-old-pwd: -tomb-pwd: " subcommands_opts[close]="-sudo-pwd: " subcommands_opts[help]="" subcommands_opts[slam]="" subcommands_opts[list]="-get-mountpoint " subcommands_opts[index]="" subcommands_opts[search]="" subcommands_opts[help]="" subcommands_opts[bury]="f -force k: -key=k -tomb-pwd: " subcommands_opts[exhume]="f -force k: -key=k -tomb-pwd: " # subcommands_opts[decompose]="" # subcommands_opts[recompose]="" # subcommands_opts[install]="" subcommands_opts[askpass]="" subcommands_opts[source]="" subcommands_opts[resize]="f -force -ignore-swap s: -size=s k: -key=k -tomb-pwd: " subcommands_opts[check]="-ignore-swap " # subcommands_opts[translate]="" ### Detect subcommand local -aU every_opts #every_opts behave like a set; that is, an array with unique elements for optspec in $subcommands_opts$main_opts; do for opt in ${=optspec}; do every_opts+=${opt} done done local -a oldstar oldstar=("${(@)argv}") #### detect early: useful for --optiion-parsing zparseopts -M -D -Adiscardme ${every_opts} if [[ -n ${(k)discardme[--option-parsing]} ]]; then 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 shouldnt 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 --unsecure-dev-mode } && { for opt in --sudo-pwd --tomb-pwd --use-urandom --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 --unsecure-dev-mode" $opt } done } # When we run as root, we remember the original uid:gid to set # permissions for the calling user and drop privileges _whoami # Reset _UID, _GID, _TTY [[ "$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 $_TTY } # Process subcommand case "$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) check_priv dig_tomb ${=PARAM} ;; # CREATE Step 2: forge file.tomb.key forge) check_priv forge_key ${=PARAM} ;; # CREATE Step 2: lock -k file.tomb.key file.tomb lock) check_priv lock_tomb_with_key ${=PARAM} ;; # Open the tomb mount|open) check_priv mount_tomb $PARAM[1] $PARAM[2] ;; # Close the tomb # `slam` is used to force closing. umount|close|slam) check_priv [[ "$subcommand" == "slam" ]] && SLAM=1 umount_tomb $PARAM[1] ;; # Grow tomb's size resize) [[ $RESIZER == 0 ]] && { _failure "Resize2fs not installed: cannot resize tombs." } check_priv 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) check_priv change_passwd $PARAM[1] ;; # Change tomb key setkey) check_priv 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] ;; ## 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 _print "\000" _print " Copyright (C) 2007-2014 Dyne.org Foundation, License GNU GPL v3+" _print " This is free software: you are free to change and redistribute it" _print " The latest Tomb sourcecode is published on " _print "\000" option_is_set -v && { _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." _print " Please refer to the GNU Public License for more details." _print "\000" _print "System utils:" _print "\000" cat <