mirror of
https://github.com/Llewellynvdm/Tomb.git
synced 2024-11-22 04:25:12 +00:00
[cleanup] "Safety functions" section
- more documentation - follow style guide - rationalize check_swap
This commit is contained in:
hellekin
Jaromil
parent
3e91b7bb9b
commit
0754e9acd2
135
tomb
135
tomb
@ -5,6 +5,8 @@
|
||||
# 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
|
||||
|
||||
@ -150,6 +152,7 @@ TRAPSTOP() { _endgame STOP }
|
||||
# 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
|
||||
@ -185,22 +188,22 @@ _whoami() {
|
||||
|
||||
# Get connecting TTY from option -T or the environment
|
||||
option_is_set -T && _TTY=$(option_value -T)
|
||||
[[ -z $_TTY ]] && {
|
||||
_TTY=$TTY
|
||||
_verbose "Identified caller from tty ::1 TTY::)" $_TTY }
|
||||
[[ -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=""
|
||||
|
||||
local shmprefix="" # Path prefix for safe temporary files
|
||||
|
||||
# Set $shmprefix to something sensible
|
||||
[[ -z $shmprefix && -k /dev/shm ]] \
|
||||
&& shmprefix=/dev/shm || shmprefix=/run/shm
|
||||
[[ -z $shmprefix && -k "/dev/shm" ]] \
|
||||
&& shmprefix="/dev/shm" || shmprefix="/run/shm"
|
||||
|
||||
_whoami # Set _UID, _GID, _TTY, _USER
|
||||
_whoami # Set _UID and _GID for later
|
||||
|
||||
# Mount the tmpfs if the OS doesn't already
|
||||
[[ -k $shmprefix ]] || {
|
||||
@ -225,116 +228,126 @@ _ensure_safe_memory check_shm() {
|
||||
TMPPREFIX="$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"
|
||||
# _verbose '_plot TOMBPATH = ::1 tomb path::' $TOMBPATH
|
||||
|
||||
TOMBDIR=$(dirname $TOMBPATH)
|
||||
# _verbose '_plot TOMBDIR = ::1 tomb dir::' $TOMBDIR
|
||||
|
||||
TOMBFILE=$(basename $TOMBPATH)
|
||||
# _verbose '_plot TOMBFILE = ::1 tomb file::' $TOMBFILE
|
||||
|
||||
# The tomb name is TOMBFILE without an extension.
|
||||
# It can start with dots: ..foo.tomb -> ..foo
|
||||
TOMBNAME="${TOMBFILE%\.[^\.]*}"
|
||||
# _verbose '_plot TOMBNAME = ::1 tomb name::' $TOMBNAME
|
||||
|
||||
# Normalize TOMBFILE name
|
||||
TOMBFILE="${TOMBNAME}.tomb"
|
||||
# _verbose '_plot TOMBFILE = ::1 tomb file:: (normalized)' $TOMBFILE
|
||||
# Normalize tomb name
|
||||
TOMBFILE="$TOMBNAME.tomb"
|
||||
|
||||
# Normalize tomb path
|
||||
TOMBPATH="$TOMBDIR/$TOMBFILE"
|
||||
|
||||
# Normalize TOMBPATH
|
||||
TOMBPATH="${TOMBDIR}/${TOMBFILE}"
|
||||
_verbose '_plot TOMBPATH = ::1 tomb path:: (normalized)' $TOMBPATH
|
||||
}
|
||||
|
||||
# Provide a random filename in shared memory
|
||||
tmp_create() {
|
||||
local tfile="${TMPPREFIX}${RANDOM}"
|
||||
touch "$tfile"
|
||||
(( $? )) && _failure "Fatal error creating a temporary file: ::1 temp file::" $tfile
|
||||
|
||||
chown $_UID:$_GID "$tfile"
|
||||
chmod 0600 "$tfile"
|
||||
(( $? )) && _failure "Fatal error setting permissions on temporary file: ::1 temp file::" $tfile
|
||||
local tfile="${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::" $tfile
|
||||
TOMBTMPFILES+=($tfile)
|
||||
|
||||
return 0
|
||||
|
||||
}
|
||||
|
||||
# Print the name of the latest temporary file created
|
||||
tmp_new() {
|
||||
# print out the latest tempfile
|
||||
|
||||
print - "${TOMBTMPFILES[${#TOMBTMPFILES}]}"
|
||||
|
||||
}
|
||||
|
||||
# Check if swap is activated
|
||||
check_swap() {
|
||||
# Return 0 if NO swap is used, 1 if swap is used
|
||||
# Return 2 if swap(s) is(are) used, but ALL encrypted
|
||||
local swaps="$(awk '/^\// { print $1 }' /proc/swaps 2>/dev/null)"
|
||||
[[ -z "$swaps" ]] && return 0 # No swap partition is active
|
||||
# Check whether all swaps are encrypted, and return 2
|
||||
# If any of the swaps is not encrypted, we bail out and return 1.
|
||||
ret=1
|
||||
# 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 $s`
|
||||
bone=$(sudo file $s)
|
||||
if [[ "$bone" =~ "swap file" ]]; then
|
||||
# It's a regular (unencrypted) swap file
|
||||
ret=1
|
||||
r=1
|
||||
break
|
||||
elif [[ "$bone" =~ "symbolic link" ]]; then
|
||||
|
||||
elif [[ "$bone" =~ "symbolic link" ]]; then
|
||||
# Might link to a block
|
||||
ret=1
|
||||
if [ "/dev/mapper" = "${s%/*}" ]; then
|
||||
is_crypt=`sudo dmsetup status "$s" | awk '/crypt/ {print $3}'`
|
||||
if [ "crypt" = "$is_crypt" ]; then
|
||||
ret=2
|
||||
fi
|
||||
else
|
||||
break
|
||||
fi
|
||||
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
|
||||
# Is a block
|
||||
ret=1
|
||||
# It's a block
|
||||
r=1
|
||||
is_crypt=`sudo dmsetup status "$s" | awk '/crypt/ {print $3}'`
|
||||
if [ "crypt" = "$is_crypt" ]; then
|
||||
ret=2
|
||||
else
|
||||
break
|
||||
fi
|
||||
[[ $is_crypt == "crypt" ]] && { r=2 } || { break }
|
||||
|
||||
fi
|
||||
done
|
||||
_warning "An active swap partition is detected, this poses security risks."
|
||||
if [[ $ret -eq 2 ]]; then
|
||||
_warning "An active swap partition is detected."
|
||||
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."
|
||||
_failure "Operation aborted."
|
||||
_warning "This poses security risks."
|
||||
_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 $ret
|
||||
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
|
||||
# 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
|
||||
check_swap
|
||||
_ensure_safe_swap
|
||||
case $? in
|
||||
0|2) # No, or encrypted swap
|
||||
return 0
|
||||
;;
|
||||
*) # Unencrypted swap
|
||||
return 1
|
||||
_failure "Operation aborted."
|
||||
;;
|
||||
esac
|
||||
fi
|
||||
|
||||
Loading…
Reference in New Issue
Block a user