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New repository for Tomb

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first public release (see changelog for history)
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Jaromil 2010-08-22 15:04:19 +02:00
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Denis Roio <jaromil@dyne.org

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The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

29
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August 2010
The first public version of Tomb is released to the public
During the year 2009
Tomb has been extensively tested, perfectioned and documented
after being used by its author
Sometime in 2007
mknest was refactored to work on the Debian distribution and since
then renamed to Tomb. dyne:bolic specific dependencies where
removed, keeping Zsh as the shell script it is written with.
Back in 2005
The "nesting" feature of dyne:bolic GNU/Linux lets users encrypt
their home in a file, using a shell script and a graphical
interface called Taschino.
Taschino included a shell script wrapping cryptsetup to encrypt
loopback mounted partitions with the algo AES-256 (cbc-essiv
mode): this script was called 'mkNest' and its the ancestor of
Tomb.

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Installation Instructions
*************************
Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005,
2006, 2007, 2008, 2009 Free Software Foundation, Inc.
This file is free documentation; the Free Software Foundation gives
unlimited permission to copy, distribute and modify it.
Basic Installation
==================
Briefly, the shell commands `./configure; make; make install' should
configure, build, and install this package. The following
more-detailed instructions are generic; see the `README' file for
instructions specific to this package.
The `configure' shell script attempts to guess correct values for
various system-dependent variables used during compilation. It uses
those values to create a `Makefile' in each directory of the package.
It may also create one or more `.h' files containing system-dependent
definitions. Finally, it creates a shell script `config.status' that
you can run in the future to recreate the current configuration, and a
file `config.log' containing compiler output (useful mainly for
debugging `configure').
It can also use an optional file (typically called `config.cache'
and enabled with `--cache-file=config.cache' or simply `-C') that saves
the results of its tests to speed up reconfiguring. Caching is
disabled by default to prevent problems with accidental use of stale
cache files.
If you need to do unusual things to compile the package, please try
to figure out how `configure' could check whether to do them, and mail
diffs or instructions to the address given in the `README' so they can
be considered for the next release. If you are using the cache, and at
some point `config.cache' contains results you don't want to keep, you
may remove or edit it.
The file `configure.ac' (or `configure.in') is used to create
`configure' by a program called `autoconf'. You need `configure.ac' if
you want to change it or regenerate `configure' using a newer version
of `autoconf'.
The simplest way to compile this package is:
1. `cd' to the directory containing the package's source code and type
`./configure' to configure the package for your system.
Running `configure' might take a while. While running, it prints
some messages telling which features it is checking for.
2. Type `make' to compile the package.
3. Optionally, type `make check' to run any self-tests that come with
the package.
4. Type `make install' to install the programs and any data files and
documentation.
5. You can remove the program binaries and object files from the
source code directory by typing `make clean'. To also remove the
files that `configure' created (so you can compile the package for
a different kind of computer), type `make distclean'. There is
also a `make maintainer-clean' target, but that is intended mainly
for the package's developers. If you use it, you may have to get
all sorts of other programs in order to regenerate files that came
with the distribution.
6. Often, you can also type `make uninstall' to remove the installed
files again.
Compilers and Options
=====================
Some systems require unusual options for compilation or linking that
the `configure' script does not know about. Run `./configure --help'
for details on some of the pertinent environment variables.
You can give `configure' initial values for configuration parameters
by setting variables in the command line or in the environment. Here
is an example:
./configure CC=c99 CFLAGS=-g LIBS=-lposix
*Note Defining Variables::, for more details.
Compiling For Multiple Architectures
====================================
You can compile the package for more than one kind of computer at the
same time, by placing the object files for each architecture in their
own directory. To do this, you can use GNU `make'. `cd' to the
directory where you want the object files and executables to go and run
the `configure' script. `configure' automatically checks for the
source code in the directory that `configure' is in and in `..'.
With a non-GNU `make', it is safer to compile the package for one
architecture at a time in the source code directory. After you have
installed the package for one architecture, use `make distclean' before
reconfiguring for another architecture.
On MacOS X 10.5 and later systems, you can create libraries and
executables that work on multiple system types--known as "fat" or
"universal" binaries--by specifying multiple `-arch' options to the
compiler but only a single `-arch' option to the preprocessor. Like
this:
./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
CPP="gcc -E" CXXCPP="g++ -E"
This is not guaranteed to produce working output in all cases, you
may have to build one architecture at a time and combine the results
using the `lipo' tool if you have problems.
Installation Names
==================
By default, `make install' installs the package's commands under
`/usr/local/bin', include files under `/usr/local/include', etc. You
can specify an installation prefix other than `/usr/local' by giving
`configure' the option `--prefix=PREFIX'.
You can specify separate installation prefixes for
architecture-specific files and architecture-independent files. If you
pass the option `--exec-prefix=PREFIX' to `configure', the package uses
PREFIX as the prefix for installing programs and libraries.
Documentation and other data files still use the regular prefix.
In addition, if you use an unusual directory layout you can give
options like `--bindir=DIR' to specify different values for particular
kinds of files. Run `configure --help' for a list of the directories
you can set and what kinds of files go in them.
If the package supports it, you can cause programs to be installed
with an extra prefix or suffix on their names by giving `configure' the
option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
Optional Features
=================
Some packages pay attention to `--enable-FEATURE' options to
`configure', where FEATURE indicates an optional part of the package.
They may also pay attention to `--with-PACKAGE' options, where PACKAGE
is something like `gnu-as' or `x' (for the X Window System). The
`README' should mention any `--enable-' and `--with-' options that the
package recognizes.
For packages that use the X Window System, `configure' can usually
find the X include and library files automatically, but if it doesn't,
you can use the `configure' options `--x-includes=DIR' and
`--x-libraries=DIR' to specify their locations.
Particular systems
==================
On HP-UX, the default C compiler is not ANSI C compatible. If GNU
CC is not installed, it is recommended to use the following options in
order to use an ANSI C compiler:
./configure CC="cc -Ae -D_XOPEN_SOURCE=500"
and if that doesn't work, install pre-built binaries of GCC for HP-UX.
On OSF/1 a.k.a. Tru64, some versions of the default C compiler cannot
parse its `<wchar.h>' header file. The option `-nodtk' can be used as
a workaround. If GNU CC is not installed, it is therefore recommended
to try
./configure CC="cc"
and if that doesn't work, try
./configure CC="cc -nodtk"
On Solaris, don't put `/usr/ucb' early in your `PATH'. This
directory contains several dysfunctional programs; working variants of
these programs are available in `/usr/bin'. So, if you need `/usr/ucb'
in your `PATH', put it _after_ `/usr/bin'.
On Haiku, software installed for all users goes in `/boot/common',
not `/usr/local'. It is recommended to use the following options:
./configure --prefix=/boot/common
Specifying the System Type
==========================
There may be some features `configure' cannot figure out
automatically, but needs to determine by the type of machine the package
will run on. Usually, assuming the package is built to be run on the
_same_ architectures, `configure' can figure that out, but if it prints
a message saying it cannot guess the machine type, give it the
`--build=TYPE' option. TYPE can either be a short name for the system
type, such as `sun4', or a canonical name which has the form:
CPU-COMPANY-SYSTEM
where SYSTEM can have one of these forms:
OS
KERNEL-OS
See the file `config.sub' for the possible values of each field. If
`config.sub' isn't included in this package, then this package doesn't
need to know the machine type.
If you are _building_ compiler tools for cross-compiling, you should
use the option `--target=TYPE' to select the type of system they will
produce code for.
If you want to _use_ a cross compiler, that generates code for a
platform different from the build platform, you should specify the
"host" platform (i.e., that on which the generated programs will
eventually be run) with `--host=TYPE'.
Sharing Defaults
================
If you want to set default values for `configure' scripts to share,
you can create a site shell script called `config.site' that gives
default values for variables like `CC', `cache_file', and `prefix'.
`configure' looks for `PREFIX/share/config.site' if it exists, then
`PREFIX/etc/config.site' if it exists. Or, you can set the
`CONFIG_SITE' environment variable to the location of the site script.
A warning: not all `configure' scripts look for a site script.
Defining Variables
==================
Variables not defined in a site shell script can be set in the
environment passed to `configure'. However, some packages may run
configure again during the build, and the customized values of these
variables may be lost. In order to avoid this problem, you should set
them in the `configure' command line, using `VAR=value'. For example:
./configure CC=/usr/local2/bin/gcc
causes the specified `gcc' to be used as the C compiler (unless it is
overridden in the site shell script).
Unfortunately, this technique does not work for `CONFIG_SHELL' due to
an Autoconf bug. Until the bug is fixed you can use this workaround:
CONFIG_SHELL=/bin/bash /bin/bash ./configure CONFIG_SHELL=/bin/bash
`configure' Invocation
======================
`configure' recognizes the following options to control how it
operates.
`--help'
`-h'
Print a summary of all of the options to `configure', and exit.
`--help=short'
`--help=recursive'
Print a summary of the options unique to this package's
`configure', and exit. The `short' variant lists options used
only in the top level, while the `recursive' variant lists options
also present in any nested packages.
`--version'
`-V'
Print the version of Autoconf used to generate the `configure'
script, and exit.
`--cache-file=FILE'
Enable the cache: use and save the results of the tests in FILE,
traditionally `config.cache'. FILE defaults to `/dev/null' to
disable caching.
`--config-cache'
`-C'
Alias for `--cache-file=config.cache'.
`--quiet'
`--silent'
`-q'
Do not print messages saying which checks are being made. To
suppress all normal output, redirect it to `/dev/null' (any error
messages will still be shown).
`--srcdir=DIR'
Look for the package's source code in directory DIR. Usually
`configure' can determine that directory automatically.
`--prefix=DIR'
Use DIR as the installation prefix. *Note Installation Names::
for more details, including other options available for fine-tuning
the installation locations.
`--no-create'
`-n'
Run the configure checks, but stop before creating any output
files.
`configure' also accepts some other, not widely useful, options. Run
`configure --help' for more details.

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SUBDIRS = src

0
NEWS Normal file
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..... ..
.H8888888h. ~-. . uW8"
888888888888x `> u. .. . : `t888
X~ `?888888hx~ ...ue888b .888: x888 x888. 8888 .
' x8.^"*88*" 888R Y888r ~`8888~'888X`?888f` 9888.z88N
`-:- X8888x 888R I888> X888 888X '888> 9888 888E
488888> 888R I888> X888 888X '888> 9888 888E
.. `"88* 888R I888> X888 888X '888> 9888 888E
x88888nX" . u8888cJ888 X888 888X '888> 9888 888E
!"*8888888n.. : "*888*P" "*88%""*88" '888!` .8888 888"
' "*88888888* 'Y" `~ " `"` `%888*%"
^"***"` "`
a simple commandline tool to manage encrypted storage
by Jaromil

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dnl ==============================================================
dnl Process this file with autoconf to produce a configure script.
dnl ==============================================================
dnl require autoconf 2.62 (AS_ECHO/AS_ECHO_N)
AC_PREREQ([2.60])
AC_INIT([Tomb],[0.8.0],[jaromil@dyne.org],[tomb])
AC_CONFIG_MACRO_DIR([m4])
AC_CANONICAL_HOST
dnl backwards compatibility for autoconf >= 2.64
dnl PACKAGE_URL should be the fifth argument of AC_INIT
m4_define([AC_PACKAGE_URL], [http://crypto.dyne.org])
AC_DEFINE(PACKAGE_URL, "AC_PACKAGE_URL", [Package URL])
AC_SUBST(PACKAGE_URL, AC_PACKAGE_URL)
dnl ==============================================================
dnl Get the operating system and version number...
dnl ==============================================================
AC_MSG_CHECKING([for which platform we are setting up])
case "$host_os" in
*linux*)
AC_MSG_RESULT([Linux])
have_linux=yes
if test x$have_x86_64 = xyes; then
have_64bit=yes
fi
if test x$have_x86_32 = xyes; then
have_32bit=yes
fi
;;
*darwin*)
AC_MSG_RESULT([Darwin/OSX])
have_darwin=yes
;;
*freebsd*)
AC_MSG_RESULT([FreeBSD])
have_freebsd=yes
;;
*)
AC_MSG_RESULT([$host_os?!])
AC_MSG_ERROR([[
[!] Your system architecture is not supported by AutOrg.
]], 0)
;;
esac
dnl ==============================================================
dnl Setup for automake
dnl ==============================================================
AM_INIT_AUTOMAKE([dist-bzip2 subdir-objects -Wno-portability])
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
AC_CONFIG_SRCDIR([src/tomb])
dnl Checks for programs.
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_MAKE_SET
dnl compatibility with older libtool
dnl m4_ifndef([LT_INIT], [AC_PROG_RANLIB])
dnl versioning info for libtool
DYNE_CURRENT=0
DYNE_REVISION=0
DYNE_AGE=0
DYNE_VERSION_INFO="$DYNE_CURRENT:$DYNE_REVISION:$DYNE_AGE"
dnl Note this is the ABI version which is not the same as our actual
dnl library version
AC_SUBST(DYNE_VERSION_INFO)
dnl ###########################################################################
dnl ###### now about compile time paths
AC_MSG_CHECKING([which installation prefix to use])
if test "x${prefix}" = "xNONE"; then
prefix=`pwd`
fi
AC_MSG_RESULT([${prefix}])
TOMB_PATH="${prefix}"
AC_SUBST(TOMB_PATH)
dnl alphabetic order on dir/subdir, but Makefile sorts before everything
AC_CONFIG_FILES([
Makefile
src/Makefile
])
AC_OUTPUT
dnl autoconf < 2.63 compatibility
m4_ifndef([AS_VAR_APPEND],
AC_DEFUN([AS_VAR_APPEND], $1=$$1$2))
dnl convenience function so that INFO messages go to config.log and to stdout,
dnl useful when debugging user problems only config.log is needed
dnl as above, but no newline at the end

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#!/bin/zsh
#
# Tomb
#
# a simple commandline tool to create and operate encrypted storage
#
# Copyleft (C) 2007-2010 Denis Roio <jaromil@dyne.org>
#
# thanks to Gabriele "Asbesto Molesto" Zaverio
# for suggesting the perfect name for this tool.
#
# This source code is free software; you can redistribute it and/or
# modify it under the terms of the GNU Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This source code is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# Please refer to the GNU Public License for more details.
#
# You should have received a copy of the GNU Public License along with
# this source code; if not, write to:
# Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
VERSION=0.8
DATE=Aug/2010
# standard output message routines
# it's always useful to wrap them, in case we change behaviour later
notice() { echo "[*] $1"; }
act() { echo " . $1"; }
error() { echo "[!] $1"; }
func() { if [ $DEBUG ]; then echo "[D] $1"; fi }
# user interface (just to ask the password)
ask_password() {
xhost 2>/dev/null
if [ $? = 0 ]; then # we have access to the X display
if [ -x /usr/bin/ssh-askpass ]; then # debian has this
export scolopendro="`ssh-askpass "Tomb: provide the password to unlock"`"
return
fi
else # we'll collect the password from commandline
act "Tomb: provide the password to unlock"
echo -n " > "
read -s scolopendro
export scolopendro
fi
# just in case we'd like to have dialog supported too:
# dialog --backtitle "This file is encrypted for privacy protection" \
# --title "Security check" --insecure \
# --passwordbox "Enter password:" 10 30 2> /var/run/.scolopendro
}
# checks if a file is writable
# differs from -w coz returns true if does not exist but can be created
is_writable() { # arg: filename
file=$1
writable=false
if [ -r $file ]; then # file exists
if [ -w $file ]; then writable=true; fi
else # file does not exist
touch $file 1>/dev/null 2>/dev/null
if [ $? = 0 ]; then
writable=true
rm $file
fi
fi
if [ x$writable = xtrue ]; then
echo "true"
else
echo "false"
fi
}
# appends a new line to a text file, if not duplicate
# it sorts alphabetically the original order of line entries
# defines the APPEND_FILE_CHANGED variable if file changes
append_line() { # args: file new-line
# first check if the file is writable
# this also creates the file if doesn't exists
if [ `is_writable $1` = false ]; then
error "file $1 is not writable"
error "can't insert line: $2"
return
fi
tempfile="`basename $1`.append.tmp"
# create a temporary file and add the line there
cp $1 /tmp/$tempfile
echo "$2" >> /tmp/$tempfile
# sort and uniq the temp file to temp.2
cat /tmp/$tempfile | sort | uniq > /tmp/${tempfile}.2
SIZE1="`ls -l /tmp/$tempfile | awk '{print $5}'`"
SIZE2="`ls -l /tmp/${tempfile}.2 | awk '{print $5}'`"
if [ $SIZE != $SIZE ]; then
# delete the original
rm -f $1
# replace it
cp -f /tmp/${tempfile}.2 $1
# signal the change
APPEND_FILE_CHANGED=true
fi
# remove the temporary files
rm -f /tmp/$tempfile
rm -f /tmp/${tempfile}.2
# and we are done
}
PATH=/usr/bin:/usr/sbin:/bin:/sbin
############################
### main()
###
notice "tomb - simple commandline tool for encrypted storage"
act "version $VERSION ($DATE) by Denis J. Roio <jaromil@dyne.org>"
#act "invoked with args \"$*\" "
#act "running on `date`"
OPTS=`getopt -o hvs:k: -n 'tomb' -- "$@"`
while true; do
case "$1" in
-h)
notice "SYNOPSIS: tomb [options] COMMAND [FILE|PARTITION] [MOUNTPOINT|NAME]"
notice "OPTIONS:"
act "-h print this help"
act "-v print out the version information for this tool"
act "-s size of the storage file when creating one (in MBytes)"
act "-k path key to be used for decryption (defaults in ~/.tomb)"
notice "COMMANDS:"
act "format format a PARTITION with NAME and generate keys"
act "create create a new encrypted storage FILE and keys"
act "mount mount an existing storage FILE on MOUNTPOINT"
act "umount unmounts a mounted storage MOUNTPOINT"
echo; exit 2 ;;
-v)
act "(c)2007 by Denis Rojo <jaromil@dyne.org> as part of dyne:bolic"
act "thanks to Gabriele \"Asbesto Molesto\" Zaverio"
act "for suggesting the perfect name for this tool"
echo
act " TOMB"
echo
act "This source code is free software; you can redistribute it and/or"
act "modify it under the terms of the GNU Public License as published"
act "by the Free Software Foundation; either version 3 of the License,"
act "or (at your option) any later version."
echo
act "This source code is distributed in the hope that it will be useful,"
act "but WITHOUT ANY WARRANTY; without even the implied warranty of"
act "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
act "Please refer to the GNU Public License for more details."
echo
act "You should have received a copy of the GNU Public License along with"
act "this source code; if not, write to:"
act "Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA."
echo
act "in case you like to port this tool to any other operating system"
act "please notice us if you succeed, or if you have difficulties you"
act "cannot overcome: http://dyne.org"
echo; exit 2 ;;
-s) SIZE=$2; shift 2 ;;
-k) KEY=$2; shift 2 ;;
--) shift; break ;;
*) CMD=$1; FILE=$2; MOUNT=$3; break ;;
esac
done
if [ -z $CMD ]; then
error "first argument missing, use -h for help"
exit 0
fi
act "command: $CMD for file $FILE"
tombdir=${HOME}/.tomb
tombtab=${tombdir}/fstab
if ! [ -r ${tombtab} ]; then
act "creating tomb filesystem tab in your home"
mkdir -p ${HOME}/.tomb
echo "# entombed filesystem information, see man tomb" > ${tombtab}
echo "# format here is similar to the system wide fstab" >> ${tombtab}
echo "# <file system> <mount point> <type> <options> <key>" >> ${tombtab}
fi
format_crypto() {
notice "Formatting partition $FILE as an encrypted storage"
act "give it a name:"
read -s fsname
act " `fdisk -l | grep ${FILE}`"
mkdir -p /tmp/tomb
modprobe dm-crypt
modprobe aes-i586
act "Generating secret key..."
key="`basename ${FILE}`"
mkdir -p ${HOME}/.tomb
cat /dev/urandom | strings | dd bs=1 count=256 of=/tmp/tomb/secret
notice "Setup your secret key file ${key}.gpg"
# here user is prompted for password
gpg -o "${HOME}/.tomb/${key}.gpg" --no-options --openpgp -c -a /tmp/tomb/secret
while [ $? = 2 ]; do
gpg -o "${HOME}/.tomb/${key}.gpg" --no-options --openpgp -c -a /tmp/tomb/secret
done
act "formatting Luks partition"
# dm-crypt only supports sha1
# but we can use aes-cbc-essiv with sha256 for better security
# see http://clemens.endorphin.org/LinuxHDEncSettings
cryptsetup --cipher aes-cbc-essiv:sha256 --key-size 256 luksFormat ${FILE} /tmp/tomb/secret
if ! [ $? = 0 ]; then
act "operation aborted."
exit 0
fi
cryptsetup --key-file /tmp/tomb/secret --batch-mode --cipher aes luksOpen ${FILE} tomb.tmp
rm -f /tmp/tomb/secret
cryptsetup luksDump ${FILE}
mkfs.ext3 -F -L "${fsname}" -j /dev/mapper/tomb.tmp
if [ $? = 0 ]; then
act "OK, encrypted partition succesfully formatted with Ext3 filesystem"
else
act "error formatting ${FILE} Ext3 filesystem"
fi
cryptsetup luksClose tomb.tmp
notice "done formatting $FILE encrypted partition (using Luks dm-crypt AES/SHA256)"
act "encrypted key stored in file ${tombdir}/${key}.gpg"
append_line ${tombtab} \
"${FILE} ${tombdir}/`basename ${FILE}` aes-cbc-essiv:sha256 none ${tombdir}/${key}.gpg"
}
create_crypto() {
if [ -z $SIZE ]; then
error "size is not specified, please use -s option when creating a storage file"
exit 0
else
act "size set to $SIZE MB"
fi
SIZE_4k=`expr \( $SIZE \* 1000 \) / 4`
notice "generating file of ${SIZE}Mb (${SIZE_4k} blocks of 4Kb)"
act "dd if=/dev/zero of=${FILE} bs=4k count=$SIZE_4k"
# now with progress bar!
dd if=/dev/zero bs=4k count=${SIZE_4k} of=${FILE}
if [ $? = 0 -a -e ${FILE} ]; then
act "OK: `ls -l ${FILE}`"
else
error "Error creating the nest file ${FILE} : (dd if=/dev/zero of=${FILE} bs=4k count=$SIZE_4k)"
sleep 4
exit 0
fi
mkdir -p /tmp/tomb
modprobe dm-crypt
modprobe aes-i586
nstloop=`losetup -f` # get the number for next loopback device
losetup -f ${FILE} # allocates the next loopback for our file
act "Generating secret key..."
cat /dev/urandom | strings | dd bs=1 count=256 of=/tmp/tomb/secret
clear
notice "Setup your secret key file ${FILE}.gpg"
# here user is prompted for password
gpg -o "${FILE}.gpg" --no-options --openpgp -c -a /tmp/tomb/secret
while [ $? = 2 ]; do
gpg -o "${FILE}.gpg" --no-options --openpgp -c -a /tmp/tomb/secret
done
act "formatting Luks mapped device"
# dm-crypt only supports sha1
# but we can use aes-cbc-essiv with sha256 for better security
# see http://clemens.endorphin.org/LinuxHDEncSettings
cryptsetup --cipher aes-cbc-essiv:sha256 --key-size 256 luksFormat ${nstloop} /tmp/tomb/secret
if ! [ $? = 0 ]; then
act "operation aborted."
exit 0
fi
act "formatting Ext3 filesystem"
cryptsetup --key-file /tmp/tomb/secret --batch-mode --cipher aes luksOpen ${nstloop} tomb.tmp
rm -f /tmp/tomb/secret
cryptsetup luksDump ${nstloop}
mkfs.ext3 -F -j -L "dyne:nest" /dev/mapper/tomb.tmp
if [ $? = 0 ]; then
act "OK, encrypted storage succesfully formatted with Ext3 filesystem"
else
act "error formatting storage file with Ext3 filesystem"
fi
cryptsetup luksClose tomb.tmp
losetup -d ${nstloop}
notice "done creating $FILE encrypted storage (using Luks dm-crypt AES/SHA256)"
}
mount_crypto() {
if ! [ -r $FILE ]; then
error "file or partition $FILE does not exists"
exit 0
fi
# check if its a file or partition
file ${FILE} | grep block > /dev/null
if [ $? = 0 ]; then
act "$FILE is a partition"
mount_crypto_partition
else
act "$FILE is a loopback file"
mount_crypto_file
fi
}
mount_crypto_file() {
if [ -z $KEY ]; then
enc_key="~/.tomb/`basename $FILE`"
else
enc_key="$KEY"
fi
notice "mounting $FILE on mountpoint $MOUNT"
if [ -z $MOUNT ]; then
error "you need to specify a MOUNTPOINT for the mount command"
exit 0
fi
if ! [ -x $MOUNT ]; then
error "mountpoint $MOUNT doesn't exist"
exit 0
fi
act "mounting $FILE on mountpoint $MOUNT over loopback device"
nstloop=`losetup -f`
losetup -f ${FILE}
act "check for a valid LUKS encrypted device"
cryptsetup isLuks ${nstloop}
if [ $? = 0 ]; then # it's a LUKS encrypted nest, see cryptsetup(1)
# check if key file is present
if ! [ -r "${enc_key}" ]; then
error "encryption key ${enc_key} not found"
error "use -k option to specify which key to use"
losetup -d ${nstloop}
sleep 5
return
fi
modprobe dm-crypt
modprobe aes-i586
mapper="tomb.`date +%s`"
notice "Password is required for key ${enc_key}"
for c in 1 2 3; do
ask_password
echo "${scolopendro}" \
| gpg --passphrase-fd 0 --no-tty --no-options \
-d "${enc_key}" 2>/dev/null \
| cryptsetup --key-file - luksOpen ${nstloop} ${mapper}
unset scolopendro
if [ -r /dev/mapper/${mapper} ]; then
break; # password was correct
fi
done
if ! [ -r /dev/mapper/${mapper} ]; then
error "failure mounting the encrypted file"
tail /var/log/messages
losetup -d ${nstloop}
return
fi
act "encrypted storage filesystem check"
fsck.ext3 -p -C0 /dev/mapper/${mapper}
mount -t ext3 /dev/mapper/${mapper} ${MOUNT}
notice "encrypted storage $FILE succesfully mounted on $MOUNT"
append_line /var/run/tombs "${MOUNT} ${mapper} ${nstloop}"
else
error "$FILE is not a valid Luks encrypted storage file"
fi
}
mount_crypto_partition() {
if [ -z $KEY ]; then
key=`basename $FILE`
grep -e "^${FILE}" ${tombtab}
if [ $? = 1 ]; then
error "entombed partition $file is not found in ${tombtab}"
error "aborting operation."
exit 1
fi
if [ -r ${tombdir}/${key}.gpg ]; then
enc_key=${tombdir}/${key}.gpg
else
error "secret encryption key for partition ${FILE} not found in ${tombdir}/${key}.gpg"
error "we cannot decrypt files from partition ${FILE}. sorry."
exit 0
fi
else
enc_key=${KEY}
act "using key $KEY to unlock"
fi
if [ -z $MOUNT ]; then
mount=`grep "^${FILE}" ${tombtab} | awk '{print $2}'`
if ! [ -x $mount ]; then
error "you need to specify a MOUNTPOINT for the mount command"
exit 1
else
MOUNT=$mount
fi
fi
notice "mounting entombed partition $FILE on mountpoint $MOUNT"
if ! [ -x $MOUNT ]; then
error "mountpoint $MOUNT does not exist"
exit 1
fi
act "check if nest is a an encrypted Luks device"
cryptsetup isLuks ${FILE}
if [ $? = 0 ]; then
act "secret encryption key found in ${enc_key}"
modprobe dm-crypt
modprobe aes-i586
mapper="tomb.${key}.`date +%s`"
notice "Password is required to unlock the encryption key"
for c in 1 2 3 4 5; do
ask_password $c
cat /var/run/.scolopendro \
| gpg --passphrase-fd 0 --no-tty --no-options \
-d ${enc_key} 2>/dev/null \
| cryptsetup --key-file - luksOpen ${FILE} ${mapper}
rm -f /var/run/.scolopendro
if [ -r /dev/mapper/${mapper} ]; then
break; # password was correct
else
dialog --sleep 3 --infobox \
"password invalid, `expr 5 - $attempt` attempts left" 10 30
fi
done
if ! [ -r /dev/mapper/${mapper} ]; then
error "failure mounting the encrypted file"
return # this exits
fi
act "encrypted storage filesystem check"
fsck.ext3 -p -C0 /dev/mapper/${mapper}
mount -t ext3 /dev/mapper/${mapper} ${MOUNT}
notice "encrypted partition $FILE succesfully mounted on $MOUNT"
touch ${tombdir}/mtab
echo "${FILE} ${MOUNT} ${mapper}" >> ${tombdir}/mtab
else
error "$FILE is not a valid Luks encrypted partition"
fi
}
umount_crypto() {
if [ -z $FILE ]; then
# TODO: if only one tomb is mounted, unmount that
error "must specify the mountpoint to be unmounted"
exit 0
fi
mapper=`mount | grep $FILE | awk '{print $1}'`
if [ "$mapper" = "" ]; then
error "$FILE is not mounted"
return
fi
mapper=`basename $mapper`
if ! [ -r /dev/mapper/${mapper} ]; then
error "tomb doesn't seems to be mounted:"
error "${mapper} is not present in /dev/mapper"
exit 1
fi
umount ${FILE}
if ! [ $? = 0 ]; then
error "error occurred in umount ${FILE}"
exit 0
fi
cryptsetup luksClose ${mapper}
if ! [ $? = 0 ]; then
error "error occurred in cryptsetup luksClose ${mapper}"
exit 0
fi
# echo ${nstloop} | grep loop 1>/dev/null 2>/dev/null
# # if it's a loopback then we need to do losetup -d
# if [ $? = 0 ]; then
# losetup -d ${nstloop}
# if ! [ $? = 0 ]; then
# error "error occurred in losetup -d ${nstloop}"
# exit 0
# fi
# fi
if [ $? = 1 ]; then
notice "crypt storage ${mapper} unmounted from $FILE"
fi
}
case "$CMD" in
create) create_crypto ;;
format) format_crypto ;;
mount) mount_crypto ;;
umount) umount_crypto ;;
unmount) umount_crypto ;;
*) error "command \"$CMD\" not recognized"
act "try -h for help"
;;
esac