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https://github.com/Llewellynvdm/Tomb.git
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cleaned up old create_tomb and updated terminal help
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Jaromil
parent
342c121fa2
commit
32cf477b58
225
src/tomb
225
src/tomb
@ -334,11 +334,9 @@ check_command() {
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#before wasting user's time
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if ! option_is_set --ignore-swap && ! option_is_set -f; then
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if [[ $1 == 'create' || $1 == 'open' ]]; then
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if ! check_swap; then
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error "Swap activated. Disable it with swapoff, or use --ignore-swap"
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exit 1
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fi
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if ! check_swap; then
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error "Swap activated. Disable it with swapoff, or use --ignore-swap"
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exit 1
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fi
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fi
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}
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@ -350,18 +348,24 @@ Syntax: tomb [options] command [file] [place]
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Commands:
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create create a new tomb FILE and its keys (needs size)
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open open an existing tomb FILE on PLACE
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list list all open tombs or the one called FILE
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close close the open tomb called FILE (or all)
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slam close tomb FILE and kill all pids using it
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passwd change the password of a tomb key FILE
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resize resize a tomb FILE (only bigger, needs size)
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dig create a new empty TOMB file of --size in MB
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forge create a new KEY file and set its password
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lock installs a lock on a TOMB to use it with KEY
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open open an existing TOMB
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list list open TOMBs
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close close a TOMB (or all)
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slam slam a TOMB killing all programs using it
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passwd change the password of a KEY
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resize resize a TOMB to a new --size (can only grow)
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EOF
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if [ "$STEGHIDE" = 1 ]; then
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cat <<EOF
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bury hide a tomb key FILE inside a jpeg PLACE
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exhume extract a tomb key FILE from a jpeg PLACE
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bury hide a KEY inside a JPEG image
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exhume extract a KEY from a JPEG image
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EOF
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fi
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cat <<EOF
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@ -634,195 +638,6 @@ exec_safe_post_hooks() {
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# }}}
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# {{{ TOMB SUB-COMMANDS
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# {{{ - Create
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# $1 is the tomb path
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create_tomb() {
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_message "Commanded to create tomb $1"
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# we run as root, but remember the original uid:gid to drop
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# privileges when not needed anymore
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if option_is_set -U; then _uid="`option_value -U`"; fi
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if option_is_set -G; then _gid="`option_value -G`"; fi
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# if swap is on, we remind the user about possible data leaks to disk
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if ! option_is_set -f && ! option_is_set --ignore-swap; then check_swap; fi
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if ! [ $1 ]; then
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_warning "no tomb name specified for creation"
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return 1
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fi
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# the encryption cipher for a tomb can be set at creation using -o
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if ! option_is_set -o; then
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create_cipher="`option_value -o`"
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else
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create_cipher=aes-cbc-essiv:sha256
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fi
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tombfile=`basename $1`
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tombdir=`dirname $1`
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# make sure the file has a .tomb extension
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tombname=${tombfile%%\.*}
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tombfile=${tombname}.tomb
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# require the specification of the size of the tomb (-s) in MB
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tombsize="`option_value -s`"
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[ $tombsize ] || die "Size argument missing, use --size"
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[[ $tombsize != <-> ]] && die "Size argument is not an integer"
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if [ -e ${tombdir}/${tombfile} ]; then
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_warning "tomb exists already. I'm not digging here:"
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ls -lh ${tombdir}/${tombfile}
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return 1
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fi
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# check if the key is set manually then use the one existing
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if option_is_set -k; then
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tombkey="`option_value -k`"
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if [ -e "${tombkey}" ]; then
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_message "Use an existing key to lock the new tomb:"
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ls -lh ${tombkey}
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fi
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# this does a check on the file header, virtuosism by hellekin
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# [[ `file =(awk '/^-+BEGIN/,0' $1) -bi` =~ application/pgp ]]
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if ! is_valid_key ${tombkey}; then
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_warning "The key seems invalid, the application/pgp header is missing"
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die "Operation aborted."
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fi
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else
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tombkey="new" # generate it new later
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fi
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_success "Creating a new tomb in ${tombdir}/${tombfile}"
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if [ -z $tombsize ]; then
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_message "No size specified, summoning the Tomb Undertaker to guide us in the creation."
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"$TOMBOPENEXEC" &
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wait $!
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return 0
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fi
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tombsize_4k=`expr $tombsize \* 1024 / 4`
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_message "Generating ${tombfile} of ${tombsize}Mb (${tombsize_4k} blocks of 4Kb)"
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# we will first touch the file and set permissions: this way, even if interrupted, permissions are right
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touch ${tombdir}/${tombfile}
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chown ${_uid}:${_gid} "${tombdir}/${tombfile}"
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chmod 0600 "${tombdir}/${tombfile}"
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$DD if=/dev/urandom bs=4k count=${tombsize_4k} of=${tombdir}/${tombfile}
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if [ $? = 0 -a -e ${tombdir}/${tombfile} ]; then
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_success "OK: `ls -lh ${tombdir}/${tombfile}`"
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else
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die "Error creating the tomb ${tombdir}/${tombfile}, operation aborted."
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fi
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nstloop=`losetup -f` # get the number for next loopback device
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losetup -f ${tombdir}/${tombfile} # allocates the next loopback for our file
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# create the keyfile in tmpfs so that we leave less traces in RAM
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keytmp=`safe_dir tomb`
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(( $? )) && die "error creating temp dir"
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xxx "safe_dir at $keytmp"
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#rm -f $keytmp
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# ?????? creo, cancello e ricreo ??????
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#mkdir -p $keytmp
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mount tmpfs "${keytmp}" -t tmpfs -o size=1m
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if [ $? != 0 ]; then
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_warning "cannot mount tmpfs filesystem in volatile memory"
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losetup -d $nstloop
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rm -r "${keytmp}"
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die "operation aborted."
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fi
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_message "Generating secret key..."
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_message "this operation takes time, keep using this computer on other tasks,"
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_message "once done you will be asked to choose a password for your tomb."
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_message "To make it faster you can move the mouse around"
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touch ${keytmp}/tomb.tmp
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chmod 0600 ${keytmp}/tomb.tmp
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random_source=/dev/random
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if option_is_set --use-urandom; then
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random_source=/dev/urandom
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fi
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if [[ $DD = "dcfldd" ]]; then
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$DD bs=1 count=256 if=$random_source of=${keytmp}/tomb.tmp statusinterval=1
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else
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$DD bs=1 count=256 if=$random_source of=${keytmp}/tomb.tmp
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fi
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if ! [ -r ${keytmp}/tomb.tmp ]; then
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_warning "cannot generate encryption key"
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umount ${keytmp}
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losetup -d $nstloop
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rm -r $keytmp
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die "operation aborted."
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fi
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_success "Setup your secret key file ${tombkey}"
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if [ "$tombkey" = "new" ]; then
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tombkey="${tombdir}/${tombfile}.key"
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touch ${tombkey}
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chown ${_uid}:${_gid} ${tombkey}
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chmod 0600 ${tombkey}
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gen_key ${keytmp}/tomb.tmp > ${tombkey}
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fi
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if ! is_valid_key ${tombkey}; then
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_warning "The key does not seem to be valid"
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fi
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# if [ $? != 0 ]; then
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# _warning "setting password failed: gnupg returns 2"
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# umount ${keytmp}
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# losetup -d $nstloop
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# rm -r $keytmp
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# exit 1
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# fi
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_message "formatting Luks mapped device"
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# we use aes-cbc-essiv with sha256
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# for security, performance and compatibility
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# XXX: More for compatibility then, because xts-plain is better nowadays.
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cryptsetup --batch-mode \
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--cipher ${create_cipher} --key-size 256 \
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luksFormat ${nstloop} ${keytmp}/tomb.tmp
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if ! [ $? = 0 ]; then
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umount ${keytmp}
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losetup -d $nstloop
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rm -r $keytmp
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rm ${tombdir}/${tombfile}
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die "operation aborted." 0
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fi
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cryptsetup --key-file ${keytmp}/tomb.tmp --cipher ${create_cipher} luksOpen ${nstloop} tomb.tmp
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${=WIPE} ${keytmp}/tomb.tmp
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umount ${keytmp}
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rm -r ${keytmp}
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# cryptsetup luksDump ${nstloop}
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_message "formatting your Tomb with Ext3/Ext4 filesystem"
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${=MKFS} ${tombname} /dev/mapper/tomb.tmp
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if [ $? != 0 ]; then
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_warning "Tomb format returned an error:"
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_warning "your tomb ${tombfile} may be corrupted."
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fi
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sync
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cryptsetup luksClose tomb.tmp
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losetup -d ${nstloop}
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_message "done creating $tombname encrypted storage (using Luks dm-crypt ${create_cipher})"
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_success "Your tomb is ready in ${tombdir}/${tombfile} and secured with key ${tombkey}"
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}
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# This is a new way to create tombs which dissects the whole create_tomb() into 3 clear steps:
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# - dig a .tomb (the large file) using /dev/random (takes some minutes at least)
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# - forge a .key (the small file) using /dev/urandom (good entropy needed)
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@ -2191,10 +2006,6 @@ main() {
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xxx "Tomb command: $subcommand ${PARAM}"
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case "$subcommand" in
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create)
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check_priv
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create_tomb ${=PARAM}
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;;
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# new creation in three steps
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forge)
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