Llewellyn/Tomb
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fixes and cleanups

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Jaromil 2020-11-17 08:19:36 +01:00
parent 3fb248bde8
commit c3a354cc0f
1 changed files with 37 additions and 48 deletions
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tomb
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@ -95,7 +95,7 @@ typeset -Hi _UID # Running user identifier
typeset -Hi _GID # Running user group identifier typeset -Hi _GID # Running user group identifier
typeset -H _TTY # Connected input terminal typeset -H _TTY # Connected input terminal
# Tomb context (see _plot()) # Tomb context (see is_valid_tomb())
typeset -H TOMBPATH # Full path to the tomb typeset -H TOMBPATH # Full path to the tomb
typeset -H TOMBDIR # Directory where the tomb is typeset -H TOMBDIR # Directory where the tomb is
typeset -H TOMBFILE # File name of the tomb typeset -H TOMBFILE # File name of the tomb
@ -542,41 +542,40 @@ sphinx_set_password() {
# Check if a filename is a valid tomb # Check if a filename is a valid tomb
is_valid_tomb() { is_valid_tomb() {
local tombpath=$1
_verbose "is_valid_tomb ::1 tomb file::" $tombpath _verbose "is_valid_tomb ::1 tomb file::" $1
# First argument must be the path to a tomb # First argument must be the path to a tomb
[[ -z "$tombpath" ]] && { [[ $1 ]] || _failure "Tomb file is missing from arguments."
_failure "Tomb file is missing from arguments." }
_fail=0 local _fail=0
# Tomb file must be a readable, writable, non-empty regular file. # Tomb file must be a readable, writable, non-empty regular file.
# If passed the "ro" mount option, the writable check is skipped. # If passed the "ro" mount option, the writable check is skipped.
[[ ! -w "$tombpath" ]] && [[ $(option_value -o) != *"ro"* ]] && { [[ ! -w "$1" ]] && [[ $(option_value -o) != *"ro"* ]] && {
_warning "Tomb file is not writable: ::1 tomb file::" $tombpath _warning "Tomb file is not writable: ::1 tomb file::" $1
_fail=1 _fail=1
} }
_verbose "tomb file is readable" _verbose "tomb file is readable"
[[ ! -f "$tombpath" ]] && { [[ ! -f "$1" ]] && {
_warning "Tomb file is not a regular file: ::1 tomb file::" $tombpath _warning "Tomb file is not a regular file: ::1 tomb file::" $1
_fail=1 _fail=1
} }
_verbose "tomb file is a regular file" _verbose "tomb file is a regular file"
[[ ! -s "$tombpath" ]] && { [[ ! -s "$1" ]] && {
_warning "Tomb file is empty (zero length): ::1 tomb file::" $tombpath _warning "Tomb file is empty (zero length): ::1 tomb file::" $1
_fail=1 _fail=1
} }
_verbose "tomb file is not empty" _verbose "tomb file is not empty"
[[ $_fail = 1 ]] && { [[ $_fail == 1 ]] && {
_failure "Tomb command failed: ::1 command name::" $subcommand _failure "Tomb command failed: ::1 command name::" $subcommand
} }
# Tomb file may be a LUKS FS (or we are creating it) # Tomb file may be a LUKS FS (or we are creating it)
[[ "`file $tombpath`" =~ "luks encrypted file" ]] || { [[ "`file $1`" =~ "luks encrypted file" ]] || {
_warning "File is not yet a tomb: ::1 tomb file::" $tombpath } _warning "File is not yet a tomb: ::1 tomb file::" $1 }
# We set global variables # We set global variables
typeset -g TOMBPATH TOMBDIR TOMBFILE TOMBNAME TOMBMAPPER typeset -g TOMBPATH TOMBDIR TOMBFILE TOMBNAME TOMBMAPPER
@ -599,7 +598,7 @@ is_valid_tomb() {
_failure "Tomb won't work without a TOMBNAME." _failure "Tomb won't work without a TOMBNAME."
# checks if Tomb already mounted (or we cannot alter it) # checks if Tomb already mounted (or we cannot alter it)
local maphash=`realpath $tombpath | sha256sum -z` local maphash=`realpath $TOMBPATH | sha256sum -z`
local nextloop=`losetup -f` local nextloop=`losetup -f`
TOMBMAPPER="tomb.$TOMBNAME.${maphash[(w)1]}.`basename $nextloop`" TOMBMAPPER="tomb.$TOMBNAME.${maphash[(w)1]}.`basename $nextloop`"
local mounted_tombs=(`list_tomb_mounts`) local mounted_tombs=(`list_tomb_mounts`)
@ -1830,52 +1829,43 @@ engrave_key() {
# which blocks in the filesystem contain that data. # which blocks in the filesystem contain that data.
dig_tomb() { dig_tomb() {
local tombpath="$1" # Path to tomb # $1 arg is path to tomb
# Require the specification of the size of the tomb (-s) in MiB # Require the specification of the size of the tomb (-s) in MiB
local -i tombsize=$(option_value -s) local -i tombsize=$(option_value -s)
_message "Commanded to dig tomb ::1 tomb path::" $tombpath _message "Commanded to dig tomb ::1 tomb path::" $tombpath
[[ -n "$tombpath" ]] || _failure "Missing path to tomb" [[ $1 ]] || _failure "Missing path to tomb"
[[ -n "$tombsize" ]] || _failure "Size argument missing, use -s" [[ -n "$tombsize" ]] || _failure "Size argument missing, use -s"
[[ $tombsize == <-> ]] || _failure "Size must be an integer (mebibytes)" [[ $tombsize == <-> ]] || _failure "Size must be an integer (mebibytes)"
[[ $tombsize -ge 10 ]] || _failure "Tombs can't be smaller than 10 mebibytes" [[ $tombsize -ge 10 ]] || _failure "Tombs can't be smaller than 10 mebibytes"
is_valid_tomb $tombpath [[ -e $1 ]] && {
[[ -e $TOMBPATH ]] && {
_warning "A tomb exists already. I'm not digging here:" _warning "A tomb exists already. I'm not digging here:"
ls -lh $TOMBPATH ls -lh $1
return 1 return 1
} }
_success "Creating a new tomb in ::1 tomb path::" $TOMBPATH _success "Creating a new tomb in ::1 tomb path::" $1
_message "Generating ::1 tomb file:: of ::2 size::MiB" $1 $tombsize
_message "Generating ::1 tomb file:: of ::2 size::MiB" $TOMBFILE $tombsize touch "$1"
# Ensure that file permissions are safe even if interrupted
touch $TOMBPATH
[[ $? = 0 ]] || { [[ $? = 0 ]] || {
_warning "Error creating the tomb ::1 tomb path::" $TOMBPATH _warning "Error creating the tomb ::1 tomb path::" $1
_failure "Operation aborted." _failure "Operation aborted."
} }
chmod 0600 $TOMBPATH # Ensure that file permissions are safe even if interrupted
_sudo chown ${_UID}:${_GID} "$1"
chmod 0600 $1
_verbose "Data dump using ::1:: from /dev/urandom" ${DD[1]} _verbose "Data dump using ::1:: from /dev/urandom" ${DD[1]}
${=DD} if=/dev/urandom bs=1048576 count=$tombsize of=$TOMBPATH ${=DD} if=/dev/urandom bs=1048576 count=$tombsize of=$1
ls -lh "$1"
[[ $? == 0 && -e $TOMBPATH ]] && { _success "Done digging ::1 tomb name::" $1
_sudo chown ${_UID}:${_GID} "$TOMBPATH"
ls -lh "$TOMBPATH"
} || {
_warning "Error creating the tomb ::1 tomb path::" $TOMBPATH
_failure "Operation aborted."
}
_success "Done digging ::1 tomb name::" $TOMBNAME
_message "Your tomb is not yet ready, you need to forge a key and lock it:" _message "Your tomb is not yet ready, you need to forge a key and lock it:"
_message "tomb forge ::1 tomb path::.key" $TOMBPATH _message "tomb forge ::1 tomb path::.key" $1
_message "tomb lock ::1 tomb path:: -k ::1 tomb path::.key" $TOMBPATH _message "tomb lock ::1 tomb path:: -k ::1 tomb path::.key" $1
return 0 return 0
} }
@ -2766,7 +2756,6 @@ resize_tomb() {
[[ -z "$newtombsize" ]] && { [[ -z "$newtombsize" ]] && {
_failure "Aborting operations: new size was not specified, use -s" } _failure "Aborting operations: new size was not specified, use -s" }
# this also calls _plot()
is_valid_tomb $tombpath is_valid_tomb $tombpath
_load_key # Try loading new key from option -k and set TOMBKEYFILE _load_key # Try loading new key from option -k and set TOMBKEYFILE
@ -2867,16 +2856,16 @@ umount_tomb() {
_verbose "Name: ::1 tomb name::" $tombname _verbose "Name: ::1 tomb name::" $tombname
_verbose "Mount: ::1 mount point::" $tombmount _verbose "Mount: ::1 mount point::" $tombmount
_verbose "Loop: ::1 mount loop::" $tombloop _verbose "Loop: ::1 mount loop::" $tombloop
_verbose "Mapper: ::1 mapper::" $TOMBMAPPER _verbose "Mapper: ::1 mapper::" $mapper
[[ -e "$TOMBMAPPER" ]] && { [[ -e "$mapper" ]] && {
_warning "Tomb not found: ::1 tomb file::" $1 _warning "Tomb not found: ::1 tomb file::" $1
_warning "Please specify an existing tomb." _warning "Please specify an existing tomb."
return 0 } return 0 }
option_is_set -n || { option_is_set -n || {
exec_safe_func_hooks \ exec_safe_func_hooks \
close "$tombmount" "$tombname" "$tombloop" "$TOMBMAPPER" close "$tombmount" "$tombname" "$tombloop" "$mapper"
exec_hook_res=$? exec_hook_res=$?
[[ $exec_hook_res = 0 ]] || { [[ $exec_hook_res = 0 ]] || {
_warning "close exec-hook returns a non-zero error code: ::1 error::" $exec_hook_res _warning "close exec-hook returns a non-zero error code: ::1 error::" $exec_hook_res
@ -2924,8 +2913,8 @@ umount_tomb() {
[[ "$tombmount" =~ "(/run)?/media(/$_USER)?/$tombname_regex" ]] && { [[ "$tombmount" =~ "(/run)?/media(/$_USER)?/$tombname_regex" ]] && {
_sudo rmdir $tombmount } _sudo rmdir $tombmount }
_sudo cryptsetup luksClose $TOMBMAPPER || _sudo cryptsetup luksClose $mapper ||
_failure "Error occurred in cryptsetup luksClose ::1 mapper::" $TOMBMAPPER _failure "Error occurred in cryptsetup luksClose ::1 mapper::" $mapper
# Normally the loopback device is detached when unused # Normally the loopback device is detached when unused
[[ -e "/dev/$tombloop" ]] && { [[ -e "/dev/$tombloop" ]] && {