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[cleanup] "Safety functions" section
- more documentation - follow style guide - rationalize check_swap
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hellekin
Jaromil
parent
3e91b7bb9b
commit
0754e9acd2
125
tomb
125
tomb
@ -5,6 +5,8 @@
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# A commandline tool to easily operate encryption of secret data
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#
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# Homepage on: [tomb.dyne.org](http://tomb.dyne.org)
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#
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# In Emacs, you can use C-c @ C-q to (un)fold code using folding.el
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# {{{ License
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@ -150,6 +152,7 @@ TRAPSTOP() { _endgame STOP }
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# command line, -U, -G, -T, respectively, or from the environment.
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# Also update USERNAME and HOME to maintain consistency.
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_whoami() {
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# Set global variables
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typeset -gi _GID _UID
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typeset -g _TTY _USER
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@ -185,22 +188,22 @@ _whoami() {
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# Get connecting TTY from option -T or the environment
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option_is_set -T && _TTY=$(option_value -T)
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[[ -z $_TTY ]] && {
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_TTY=$TTY
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_verbose "Identified caller from tty ::1 TTY::)" $_TTY }
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[[ -z $_TTY ]] && _TTY=$TTY
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}
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# Ensure temporary files remain in RAM
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# Set global variable TMPPREFIX
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# TODO: configure which tmp dir to use from a cli flag
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_ensure_safe_memory check_shm() {
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local shmprefix=""
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local shmprefix="" # Path prefix for safe temporary files
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# Set $shmprefix to something sensible
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[[ -z $shmprefix && -k /dev/shm ]] \
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&& shmprefix=/dev/shm || shmprefix=/run/shm
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[[ -z $shmprefix && -k "/dev/shm" ]] \
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&& shmprefix="/dev/shm" || shmprefix="/run/shm"
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_whoami # Set _UID, _GID, _TTY, _USER
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_whoami # Set _UID and _GID for later
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# Mount the tmpfs if the OS doesn't already
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[[ -k $shmprefix ]] || {
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@ -225,116 +228,126 @@ _ensure_safe_memory check_shm() {
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TMPPREFIX="$shmprefix/$_UID/$RANDOM$RANDOM."
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return 0
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}
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# Define sepulture's plot (setup tomb-related arguments)
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# Synopsis: _plot /path/to/the.tomb
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_plot() {
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# We set global variables
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typeset -g TOMBPATH TOMBDIR TOMBFILE TOMBNAME
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TOMBPATH="$1"
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# _verbose '_plot TOMBPATH = ::1 tomb path::' $TOMBPATH
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TOMBDIR=$(dirname $TOMBPATH)
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# _verbose '_plot TOMBDIR = ::1 tomb dir::' $TOMBDIR
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TOMBFILE=$(basename $TOMBPATH)
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# _verbose '_plot TOMBFILE = ::1 tomb file::' $TOMBFILE
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# The tomb name is TOMBFILE without an extension.
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# It can start with dots: ..foo.tomb -> ..foo
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TOMBNAME="${TOMBFILE%\.[^\.]*}"
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# _verbose '_plot TOMBNAME = ::1 tomb name::' $TOMBNAME
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# Normalize TOMBFILE name
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TOMBFILE="${TOMBNAME}.tomb"
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# _verbose '_plot TOMBFILE = ::1 tomb file:: (normalized)' $TOMBFILE
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# Normalize tomb name
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TOMBFILE="$TOMBNAME.tomb"
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# Normalize tomb path
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TOMBPATH="$TOMBDIR/$TOMBFILE"
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# Normalize TOMBPATH
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TOMBPATH="${TOMBDIR}/${TOMBFILE}"
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_verbose '_plot TOMBPATH = ::1 tomb path:: (normalized)' $TOMBPATH
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}
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# Provide a random filename in shared memory
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tmp_create() {
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local tfile="${TMPPREFIX}${RANDOM}"
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touch "$tfile"
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(( $? )) && _failure "Fatal error creating a temporary file: ::1 temp file::" $tfile
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chown $_UID:$_GID "$tfile"
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chmod 0600 "$tfile"
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(( $? )) && _failure "Fatal error setting permissions on temporary file: ::1 temp file::" $tfile
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local tfile="${TMPPREFIX}${RANDOM}" # Temporary file
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touch $tfile
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[[ $? == 0 ]] || {
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_failure "Fatal error creating a temporary file: ::1 temp file::" $tfile }
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chown $_UID:$_GID $tfile && chmod 0600 $tfile
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[[ $? == 0 ]] || {
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_failure "Fatal error setting permissions on temporary file: ::1 temp file::" $tfile }
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_verbose "Created tempfile: ::1 temp file::" $tfile
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TOMBTMPFILES+=($tfile)
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return 0
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}
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# Print the name of the latest temporary file created
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tmp_new() {
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# print out the latest tempfile
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print - "${TOMBTMPFILES[${#TOMBTMPFILES}]}"
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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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# Return 2 if swap(s) is(are) used, but ALL encrypted
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local swaps="$(awk '/^\// { print $1 }' /proc/swaps 2>/dev/null)"
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# Return 0 if NO swap is used, 1 if swap is used.
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# Return 1 if any of the swaps is not encrypted.
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# Return 2 if swap(s) is(are) used, but ALL encrypted.
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# Use _check_swap in functions, that will call this function but will
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# exit if unsafe swap is present.
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_ensure_safe_swap() {
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local -i r=1 # Return code: 0 no swap, 1 unsafe swap, 2 encrypted
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local -a swaps # List of swap partitions
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local bone is_crypt
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swaps="$(awk '/^\// { print $1 }' /proc/swaps 2>/dev/null)"
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[[ -z "$swaps" ]] && return 0 # No swap partition is active
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# Check whether all swaps are encrypted, and return 2
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# If any of the swaps is not encrypted, we bail out and return 1.
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ret=1
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for s in $=swaps; do
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bone=`sudo file $s`
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bone=$(sudo file $s)
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if [[ "$bone" =~ "swap file" ]]; then
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# It's a regular (unencrypted) swap file
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ret=1
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r=1
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break
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elif [[ "$bone" =~ "symbolic link" ]]; then
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# Might link to a block
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ret=1
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if [ "/dev/mapper" = "${s%/*}" ]; then
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is_crypt=`sudo dmsetup status "$s" | awk '/crypt/ {print $3}'`
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if [ "crypt" = "$is_crypt" ]; then
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ret=2
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fi
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else
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break
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fi
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r=1
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[[ "/dev/mapper" == "${s%/*}" ]] || { break }
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is_crypt=$(sudo dmsetup status "$s" | awk '/crypt/ {print $3}')
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[[ $is_crypt == "crypt" ]] && { r=2 }
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elif [[ "$bone" =~ "block special" ]]; then
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# Is a block
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ret=1
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# It's a block
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r=1
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is_crypt=`sudo dmsetup status "$s" | awk '/crypt/ {print $3}'`
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if [ "crypt" = "$is_crypt" ]; then
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ret=2
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else
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break
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fi
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[[ $is_crypt == "crypt" ]] && { r=2 } || { break }
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fi
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done
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_warning "An active swap partition is detected, this poses security risks."
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if [[ $ret -eq 2 ]]; then
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_warning "An active swap partition is detected."
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if [[ $r -eq 2 ]]; then
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_success "All your swaps are belong to crypt. Good."
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else
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_warning "This poses security risks."
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_warning "You can deactivate all swap partitions using the command:"
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_warning " swapoff -a"
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_warning "But if you want to proceed like this, use the -f (force) flag."
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_failure "Operation aborted."
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fi
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return $ret
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return $r
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}
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# Wrapper to allow encrypted swap and remind the user about
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# possible data leaks to disk if swap is on, and not to be ignored
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# Wrapper to allow encrypted swap and remind the user about possible
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# data leaks to disk if swap is on, and not to be ignored. It could
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# be run once in main(), but as swap evolves, it's better to run it
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# whenever swap may be needed.
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# Exit if unencrypted swap is active on the system.
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_check_swap() {
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if ! option_is_set -f && ! option_is_set --ignore-swap; then
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check_swap
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_ensure_safe_swap
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case $? in
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0|2) # No, or encrypted swap
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return 0
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;;
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*) # Unencrypted swap
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return 1
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_failure "Operation aborted."
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;;
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esac
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fi
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