mirror of
https://github.com/Llewellynvdm/Tomb.git
synced 2024-12-31 13:12:00 +00:00
relevant code cleanup
reenginered priviled escalation fixed more test cases
This commit is contained in:
Jaromil
parent
613fb37cc7
commit
465e2f63e5
296
src/tomb
296
src/tomb
@ -20,8 +20,8 @@
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# this source code; if not, write to:
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# Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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VERSION=0.9
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DATE=Jan/2011
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VERSION=0.9.1
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DATE=Feb/2011
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# PATH=/usr/bin:/usr/sbin:/bin:/sbin
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@ -50,6 +50,10 @@ fi
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# usb auto detect using dmesg
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# tested on ubuntu 10.04 - please test and patch on other systems if you can
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# TODO: use udev rules, see how archlinux folks document it - arch rox 8)
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# https://wiki.archlinux.org/index.php/System_Encryption_with_LUKS_for_dm-crypt
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# here we could modularize the choice of methods using function pointers,
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# so that they are configurable when calling tomb.
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ask_usbkey() {
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notice "Waiting 1 minute for a usb key to connect"
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echo -n " . please insert your usb key "
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@ -127,15 +131,16 @@ ask_usbkey() {
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# user interface (just to ask the password)
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ask_password() {
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exec_as_user xhost 2>/dev/null
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exec_as_user xhost # 2&>1 >/dev/null
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if [ $? = 0 ]; then # we have access to the X display
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exec_as_user which tomb-askpass
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exec_as_user which tomb-askpass # 2&>1 > /dev/null
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if [ $? = 0 ]; then
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keyname=`basename $enc_key | cut -d. -f1`
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export scolopendro="`exec_as_user tomb-askpass $keyname`"
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export scolopendro="`exec_as_user tomb-askpass ${1} 2>/dev/null`"
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return
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elif [ -x /usr/bin/ssh-askpass ]; then # debian has this
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fi
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exec_as_user which ssh-askpass # 2&>1 > /dev/null
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if [ $? = 0 ]; then
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export scolopendro="`exec_as_user ssh-askpass "Tomb: provide the password to unlock"`"
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return
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fi
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@ -146,6 +151,7 @@ ask_password() {
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echo -n " > "
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read -s scolopendro
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export scolopendro
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fi
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# just in case we'd like to have dialog supported too:
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@ -157,22 +163,69 @@ ask_password() {
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# popup notification
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tomb-notify() {
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# look for our icon in common prefixes
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if [ -r /usr/share/pixmaps/monmort.xpm ]; then icon=/usr/share/pixmaps/monmort.xpm
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elif [ -r /usr/share/icons/monmort.xpm ]; then icon=/usr/share/icons/monmort.xpm
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elif [ -r /usr/local/share/pixmaps/monmort.xpm ]; then icon=/usr/local/share/pixmaps/monmort.xpm
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elif [ -r /usr/local/share/icons/monmort.xpm ]; then icon=/usr/local/share/icons/monmort.xpm
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elif [ -r /opt/share/pixmaps/monmort.xpm ]; then icon=/opt/share/pixmaps/monmort.xpm
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elif [ -r /sw/share/pixmaps/monmort.xpm ]; then icon=/sw/share/pixmaps/monmort.xpm
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fi
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if [ -z $1 ]; then
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exec_as_user notify-send -i monmort \
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exec_as_user notify-send -i $icon \
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-u low -h string:App:Tomb \
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-h double:Version:${VERSION} \
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"Tomb version $VERSION" \
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"Hi, I'm the Undertaker.
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Let's start setting your Crypt?"
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else
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exec_as_user notify-send -i monmort ${@}
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exec_as_user notify-send -i $icon ${@}
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fi
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}
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# drop privileges
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exec_as_user() {
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if ! [ $SUDO_USER ]; then
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exec $@[@]
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return $?
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fi
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func "executing as user '$SUDO_USER': ${(f)@}"
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sudo -u $SUDO_USER ${@}
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which gksu > /dev/null
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if [ $? = 0 ]; then
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func "Using gksu for execution of '${(f)@}' as user $SUDO_USER"
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gksu -u $SUDO_USER "${@[@]}"
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return $?
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fi
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which sudo > /dev/null
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if [ $? = 0 ]; then
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func "Using sudo for execution of '${(f)@}' as user $SUDO_USER"
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sudo -u $SUDO_USER "${@[@]}"
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return $?
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fi
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}
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# escalate privileges
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check_priv() {
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id | grep root > /dev/null
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if [ $? != 0 ]; then
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which gksu > /dev/null
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if [ $? = 0 ]; then
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func "Using gksu for root execution of 'tomb ${(f)ARGS}'"
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gksu "tomb ${ARGS[@]}"
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exit $?
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fi
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which sudo > /dev/null
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if [ $? = 0 ]; then
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func "Using sudo for root execution of 'tomb ${(f)ARGS}'"
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sudo "tomb ${ARGS[@]}"
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exit $?
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fi
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exit 1
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fi
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}
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@ -184,9 +237,9 @@ notice "Tomb - simple commandline tool for encrypted storage"
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act "version $VERSION ($DATE) by Jaromil @ dyne.org"
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func "invoked with args \"${(f)@}\" "
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func "running on `date`"
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ARGS=$@[@]
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OPTS=`getopt -o hvs:k:S -n 'tomb' -- "$@"`
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OPTS=`getopt -o hvDs:k: -n 'tomb' -- "$@"`
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while true; do
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case "$1" in
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-h)
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@ -196,6 +249,7 @@ while true; do
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notice "Options:"
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act "-h print this help"
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act "-v print out the version information for this tool"
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act "-D print out debugging information at runtime"
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act "-s size of the storage file when creating one (MB)"
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act "-k path to the key to use for decryption"
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act "-S acquire super user rights if possible"
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@ -216,37 +270,7 @@ BEGIN { license=0 }
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'
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act ""
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exit 0 ;;
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-S) GETPRIV=true; shift 1 ;;
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*) break ;;
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esac
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done
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id | grep root > /dev/null
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if [ $? != 0 ]; then
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if [ "$GETPRIV" = "true" ]; then
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which gksu > /dev/null
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if [ $? = 0 ]; then
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act "Using gksu for root execution of 'tomb ${(f)@}'"
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gksu "tomb ${(f)@}"
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exit $?
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fi
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which sudo > /dev/null
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if [ $? = 0 ]; then
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act "Using sudo for root execution of 'tomb ${(f)@}'"
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sudo "tomb ${(f)@}"
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exit $?
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fi
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exit 1
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else
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error "This program must be run as root to produce results"
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exit 1
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fi
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fi
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# now process the real options
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OPTS=`getopt -o hvs:k:S -n 'tomb' -- "$@"`
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while true; do
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case "$1" in
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-D) DEBUG=1; shift 1 ;;
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-s) SIZE=$2; shift 2 ;;
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-k) KEY=$2; shift 2 ;;
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--) shift; break ;;
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@ -257,6 +281,7 @@ while true; do
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done
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if [ -z $CMD ]; then
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error "first argument missing, use -h for help"
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tomb-notify
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@ -279,11 +304,14 @@ fi
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create_tomb() {
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# make sure the file has a .tomb extension
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FILE="${FILE%\.*}.tomb"
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if [ -e "$FILE" ]; then
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error "$FILE exists already. I'm not digging here."
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exit 1
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fi
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notice "Creating a new tomb"
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if [ -z $SIZE ]; then
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if [ $MOUNT ]; then
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@ -296,12 +324,8 @@ create_tomb() {
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fi
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fi
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# make sure the file has a .tomb extension
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FILE="${FILE%\.*}.tomb"
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SIZE_4k=`expr $SIZE \* 1000 / 4`
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act "Generating ${FILE} of ${SIZE}Mb (${SIZE_4k} blocks of 4Kb)"
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# TODO: use dd_rescue
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$DD if=/dev/urandom bs=4k count=${SIZE_4k} of=${FILE}
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if [ $? = 0 -a -e ${FILE} ]; then
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@ -311,34 +335,78 @@ create_tomb() {
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exit 1
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fi
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mkdir -p /tmp/tomb
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modprobe dm-crypt
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modprobe aes-i586
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nstloop=`losetup -f` # get the number for next loopback device
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losetup -f ${FILE} # allocates the next loopback for our file
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keytmp=`tempfile`
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# create the keyfile in tmpfs so that we leave less traces in RAM
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keytmp=`tempfile -p tomb`
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rm -f $keytmp
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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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error "cannot mount tmpfs filesystem in volatile memory"
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error "operation aborted."
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losetup -d $nstloop
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rm -r $keytmp
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exit 1
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fi
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act "Generating secret key..."
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act "this operation takes time, keep using this computer on other tasks,"
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act "once done you will be asked to choose a password for your tomb."
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cat /dev/urandom | dd bs=1 count=256 of=${keytmp}
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touch ${keytmp}/tomb.tmp
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chmod 0600 ${keytmp}/tomb.tmp
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$DD bs=1 count=256 if=/dev/urandom of=${keytmp}/tomb.tmp
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if ! [ -r ${keytmp}/tomb.tmp ]; then
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error "cannot generate encryption key, operation aborted."
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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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notice "Setup your secret key file ${FILE}.gpg"
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tomb-notify "The Tomb key is being forged:" "please set your password."
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# here user is prompted for key password
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gpg -o "${FILE}.gpg" --no-options --openpgp -c -a ${keytmp}
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while [ $? = 2 ]; do
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gpg -o "${FILE}.gpg" --no-options --openpgp -c -a ${keytmp}
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for c in 1 2 3; do
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# 3 tries to write two times a matching password
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ask_password ${FILE}
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scolotemp=$scolopendro
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ask_password "${FILE} (again)"
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if [ "$scolotemp" = "$scolopendro" ]; then
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break;
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fi
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unset $scolotemp
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unset $scolopendro
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done
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if [ -z $scolopendro ]; then
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error "passwords don't match, aborting operation"
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umount ${keytmp}
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losetup -d $nstloop
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rm -r $keytmp
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exit 1
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fi
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echo "${scolopendro}" | gpg --batch --no-options --no-tty --passphrase-fd 0 \
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-o "${FILE}.gpg" -c -a ${keytmp}/tomb.tmp
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if [ $? = 2 ]; then
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error "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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act "formatting Luks mapped device"
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# dm-crypt only supports sha1
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# but we can use aes-cbc-essiv with sha256 for better security
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# see http://clemens.endorphin.org/LinuxHDEncSettings
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# we use aes-cbc-essiv with sha256
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# for security, performance and compatibility
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cryptsetup --batch-mode \
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--cipher aes-cbc-essiv:sha256 --key-size 256 \
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luksFormat ${nstloop} ${keytmp}
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luksFormat ${nstloop} ${keytmp}/tomb.tmp
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if ! [ $? = 0 ]; then
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act "operation aborted."
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@ -346,8 +414,10 @@ create_tomb() {
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fi
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cryptsetup --key-file ${keytmp} --cipher aes luksOpen ${nstloop} tomb.tmp
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${WIPE[@]} ${keytmp}
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cryptsetup --key-file ${keytmp}/tomb.tmp --cipher aes 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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notice "Your tomb is ready on ${FILE} and secured with key ${FILE}.gpg"
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act "Would you like to save the key on an external usb device?"
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@ -393,12 +463,24 @@ create_tomb() {
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mount_tomb() {
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if [ -z $KEY ]; then
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if ! [ -r $FILE ]; then
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# try also adding a .tomb extension
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FILEtomb="${FILE%\.*}.tomb"
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if ! [ -r $FILEtomb ]; then
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error "cannot find a tomb named $FILE"
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exit 1
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else
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FILE=$FILEtomb
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fi
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fi
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if ! [ $KEY ]; then
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enc_key="`basename ${FILE}.gpg`"
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else
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enc_key="$KEY"
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fi
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notice "mounting $FILE on mountpoint $MOUNT"
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if [ -z $MOUNT ]; then
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MOUNT=/media/`basename ${FILE}`
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@ -447,13 +529,17 @@ mount_tomb() {
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mapper="tomb.`basename $FILE | cut -d. -f1`.$mapdate.`basename $nstloop`"
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notice "Password is required for key ${enc_key}"
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keyname=`basename $enc_key | cut -d. -f1`
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for c in 1 2 3; do
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ask_password
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if [ $c = 1 ]; then
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ask_password ${keyname}
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else
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ask_password "$keyname (retry $c)"
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fi
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echo "${scolopendro}" \
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| gpg --passphrase-fd 0 --no-tty --no-options \
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-d "${enc_key}" 2>/dev/null \
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| gpg --batch --passphrase-fd 0 --no-tty --no-options \
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-d "${enc_key}" 2>/dev/null \
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| cryptsetup --key-file - luksOpen ${nstloop} ${mapper}
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unset scolopendro
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@ -475,7 +561,7 @@ mount_tomb() {
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mount -o rw,noatime,nodev /dev/mapper/${mapper} ${MOUNT}
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# Ensure the user can write the disk
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# Ensure the user can write the disk - 10x Hellekin :)
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ME=${SUDO_USER:-$(whoami)}
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chmod 0750 ${MOUNT}
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chown $(id -u $ME):$(id -g $ME) ${MOUNT}
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@ -490,7 +576,7 @@ umount_tomb() {
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if [ -z $FILE ]; then
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how_many_tombs=$(2>/dev/null (ls /dev/mapper/tomb.* | wc -w))
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how_many_tombs=`ls /dev/mapper/tomb.* 2> /dev/null | wc -w`
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if [ $how_many_tombs = 0 ]; then
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error "there is no open tomb to be closed"
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exit 0
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@ -503,22 +589,24 @@ umount_tomb() {
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exit 1
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fi
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else
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if [ -r $FILE ]; then
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mapper=$FILE
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elif [ -r /dev/mapper/${FILE} ]; then
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mapper=/dev/mapper/${FILE}
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else
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error "tomb not found: $FILE"
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error "please specify an existing /dev/mapper/tomb.*"
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ls /dev/mapper/tomb.*
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exit 1
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fi
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# FILE=`mount | grep $mapper | awk '{print $3}'`
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fi
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if [ -r $FILE ]; then # accepts relative and absolute path
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mapper=$FILE
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elif [ -r /dev/mapper/${FILE} ]; then
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mapper=/dev/mapper/${FILE}
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fi
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if ! [ -r $mapper ]; then
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error "tomb not found: $mapper"
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error "please specify an existing /dev/mapper/tomb.*"
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ls /dev/mapper/tomb.*
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tomb-notify "My tomb vanished" "Crypto undertaker will rest in peace."
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killall -e ${mapper}
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exit 1
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fi
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# if [ "$mapper" = "" ]; then
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# error "$FILE is not mounted"
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# return
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@ -535,11 +623,16 @@ umount_tomb() {
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basemap=`basename $mapper`
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tombname=`echo ${basemap} | cut -d. -f2`
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errno=`umount ${mapper}`
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if ! [ $? = 0 ]; then
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tomb-notify "Tomb '$tombname' is too busy." \
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"Close all applications and file managers, then try again."
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exit 1
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act "closing tomb $tombname on dm-crypt $basemap"
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mount | grep $mapper 2&>1 > /dev/null
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if [ $? = 0 ]; then # still mounted
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errno=`umount ${mapper}`
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if ! [ $? = 0 ]; then
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tomb-notify "Tomb '$tombname' is too busy." \
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"Close all applications and file managers, then try again."
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exit 1
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fi
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fi
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|
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cryptsetup luksClose $basemap
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@ -568,7 +661,7 @@ umount_tomb() {
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# install mime-types, bells and whistles for the desktop
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# see http://developers.sun.com/solaris/articles/integrating_gnome.html
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# and freedesktop specs
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install() {
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install_tomb() {
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# TODO: distro package deps (for binary)
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# debian: zsh, cryptsetup, libgtk2.0-0, libnotify-bin
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@ -653,25 +746,34 @@ tomb
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EOF
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act "Tomb is now installed."
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||||
}
|
||||
|
||||
kill_tomb() {
|
||||
# TODO: fixME - should close all tombs
|
||||
umount /tmp/tomb* 2&>1 > /dev/null
|
||||
# todo check which are tomb loops
|
||||
losetup -d /dev/loop* 2&>1 > /dev/null
|
||||
}
|
||||
|
||||
|
||||
case "$CMD" in
|
||||
create) create_tomb ;;
|
||||
create) check_priv ; create_tomb ;;
|
||||
|
||||
mount) mount_tomb ;;
|
||||
open) mount_tomb ;;
|
||||
mount) check_priv ; mount_tomb ;;
|
||||
open) check_priv ; mount_tomb ;;
|
||||
|
||||
umount) umount_tomb ;;
|
||||
unmount) umount_tomb ;;
|
||||
close) umount_tomb ;;
|
||||
umount) check_priv ; umount_tomb ;;
|
||||
unmount) check_priv ; umount_tomb ;;
|
||||
close) check_priv ; umount_tomb ;;
|
||||
|
||||
install) install ;;
|
||||
install) check_priv ; install_tomb ;;
|
||||
kill) check_priv ; kill_tomb ;;
|
||||
|
||||
status) tomb-status ;;
|
||||
notify) tomb-notify $CMD2 $CMD3 ;;
|
||||
|
||||
*) error "command \"$CMD\" not recognized"
|
||||
act "try -h for help"
|
||||
break
|
||||
exit 1
|
||||
;;
|
||||
esac
|
||||
|
||||
|
||||
@ -77,7 +77,7 @@ if [ "$1" != "create" ]; then
|
||||
fi
|
||||
|
||||
# start guided tomb creation
|
||||
tomb -S notify
|
||||
tomb notify
|
||||
cat <<EOF
|
||||
Create a new Tomb
|
||||
=================
|
||||
@ -128,6 +128,12 @@ cat <<EOF
|
||||
password:
|
||||
EOF
|
||||
tomb -S create ${filename}.tomb $size
|
||||
if [ $? != 0 ]; then
|
||||
echo "An error occurred creating tomb, operation aborted"
|
||||
tomb -S kill
|
||||
read -q
|
||||
exit 1
|
||||
fi
|
||||
if ! [ -r /usr/share/applications/tomb.desktop ]; then
|
||||
echo " Well done!"
|
||||
echo " Now the last thing to do is to install Tomb on your desktop:"
|
||||
|
||||
Loading…
Reference in New Issue
Block a user