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https://github.com/Llewellynvdm/Tomb.git
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Enforce safe SHM and no, or only encrypted swap
This commit is contained in:
hellekin
parent
7aff877fda
commit
d0e44bb264
110
src/tomb
110
src/tomb
@ -150,45 +150,83 @@ check_bin() {
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# }}}
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# {{{ - "SAFE" FUNCTIONS
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# {{{ - Create a directory with caution
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_have_shm() {
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# Check availability of 1MB of SHM
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xxx "_have_shm 0 We need only 1 MB of RAM"
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[[ -k /dev/shm ]] || return 1
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local -i SHM RAM
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SHM=$(df -k -B 4K -a -t tmpfs /dev/shm | awk '/\/dev\/shm/ { print $4; }')
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(( $? )) && return 1
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xxx "_have_shm 1 SHM $SHM KB are available"
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RAM=$(awk '/MemFree/ { print $2 }' /proc/meminfo)
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xxx "_have_shm 2 RAM $RAM KB are free"
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(( $RAM >= 1024 )) && return 0
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xxx "_have_shm 3 RAM $RAM KB left only :("
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# Now we have more RAM than affected to SHM, so we can expect some for our little needs.
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# Does that work when SHM is disabled from kernel config?
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return 1
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}
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safe_dir() {
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which mktemp &> /dev/null
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if [[ $? = 0 ]]; then
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# Try and create our temporary directory in RAM
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# Note that there's no warranty the underlying FS won't swap
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# every 5 seconds (e.g., ext3)
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local -i tries
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while (( $tries < 3 )) ; do
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tries+=1
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if _have_shm; then
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xxx "safe_dir creating directory in RAM"
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if (( $MKTEMP )); then
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mktemp -d /dev/shm/$1.$$.XXXXXXX
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return
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fi
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dir="/dev/shm/$1.$$.$RANDOM.$RANDOM"
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(umask 077 && mkdir "$dir") || print "-1"
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else
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dir="/dev/shm/$1.$$.$RANDOM$RANDOM"
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mkdir -m 0700 -p "$dir"
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print "$dir"
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fi
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return 0
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else
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_warning "WARNING: we cannot ensure we're running in RAM."
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xxx "Wait a bit before retrying... (attempt $tries)"
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sync && sleep 0.5
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fi
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done
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_warning "WARNING: no RAM available for me to run safely."
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return 1
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}
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# }}}
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# {{{ - Create a file with caution
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safe_file() {
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local tmpdir tmpfile
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if [ "$MKTEMP" = "1" ]; then
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mktemp -u /dev/shm/$1.$$.XXXXXXX
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# this return needs to output ONLY the file
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else
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tmpfile="/dev/shm/$1.$$.$RANDOM.$RANDOM"
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print $tmpfile
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fi
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# {{{ - Provide a random filename in shared memory
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safe_filename() {
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_have_shm || die "No access to shared memory on this system, sorry."
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(( $MKTEMP )) && \
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mktemp -u /dev/shm/$1.$$.XXXXXXX || \
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print "/dev/shm/$1.$$.$RANDOM$RANDOM"
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}
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# }}}
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# {{{ - Check if swap is activated
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check_swap() {
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# Return 0 if NO swap is used, 1 if swap is used
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# TODO: it should return 2 if swap is used, but encrypted
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nlines=$(wc -l /proc/swaps|cut -f1 -d ' ')
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if [[ $nlines -gt 1 ]]; then
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r=1
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else
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#and return 2
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r=0
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fi
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if [[ $1 == out ]]; then
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echo $r;
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fi
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return $r;
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# Return 2 if swap(s) is(are) used, but ALL encrypted
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local swaps=$(awk '/partition/ { print $1 }' /proc/swaps 2>/dev/null)
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[[ -z "$swaps" ]] && return 0 # No swap partition is active
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local -i count
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xxx "check_swap $swaps"
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for dev in ${=swaps}
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do
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xxx "check_swap testing device $dev (count = $count)"
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sudo cryptsetup status ${dev} | grep 'active' &>/dev/null && count+=1
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done
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xxx "$count encrypted swap(s) [${(%w)#swaps} total]"
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(( ${count} == ${(%w)#swaps} )) && return 2 # All swap partitions are encrypted
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xxx "check_swap detected some unencrypted swap"
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(( ${#{=swaps}} )) && return 1 # Some unencrypted swap partition(s)
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xxx "check_swap should never reach here"
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return 0 # No swap partition is active
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}
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# }}}
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# {{{ - Ask user for a password
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@ -467,6 +505,7 @@ print "-----END PGP MESSAGE-----"
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# }}}
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# {{{ - HOOK HELPERS
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# {{{ - Execute Bind Hooks
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exec_safe_bind_hooks() {
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if [[ -n ${(k)opts[-o]} ]]; then
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MOUNTOPTS=${opts[-o]}
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@ -509,6 +548,7 @@ exec_safe_bind_hooks() {
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fi
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done
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}
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# }}}
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# {{{ - POST-MOUNT HOOKS
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exec_safe_post_hooks() {
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@ -602,9 +642,9 @@ create_tomb() {
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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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if [ "$keytmp" = "-1" ]; then
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die "error creating temp dir"
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fi
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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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@ -1050,8 +1090,8 @@ change_passwd() {
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local tmpnewkey tmpoldkey c tombpass tombpasstmp
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tmpnewkey=`safe_file tomb`
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tmpoldkey=`safe_file tomb`
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tmpnewkey=`safe_filename tomb`
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tmpoldkey=`safe_filename tomb`
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_success "Changing password for $keyfile"
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keyname=`basename $keyfile`
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@ -1070,7 +1110,7 @@ change_passwd() {
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if [ "$tombpass" != "ok" ]; then
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_warning "You typed an Invalid old password. Operation aborted."
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# /dev/null because the file cannot exists
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# /dev/null because the file may not exist
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${=WIPE} "${tmpnewkey}" 2> /dev/null
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${=WIPE} "${tmpoldkey}" 2> /dev/null
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return 1
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