mirror of
https://github.com/Llewellynvdm/Tomb.git
synced 2024-11-15 17:17:09 +00:00
313 lines
14 KiB
Markdown
313 lines
14 KiB
Markdown
..... ..
|
|
.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 minimalistic commandline tool to manage encrypted volumes* aka **The Crypto Undertaker**
|
|
|
|
[](http://www.dyne.org)
|
|
|
|
More information and updates on website: https://www.dyne.org/software/tomb
|
|
|
|
## Get the stable .tar.gz signed release for production use!
|
|
|
|
Download it from https://files.dyne.org/tomb
|
|
|
|
For the instructions on how to get started using Tomb, see [INSTALL](INSTALL.md).
|
|
|
|
|
|
|
|
[](https://github.com/dyne/Tomb/actions)
|
|
[](https://github.com/dyne/Tomb/actions)
|
|
|
|
# What is Tomb, the crypto undertaker?
|
|
|
|
Tomb is a free and open source system for easy encryption and backup
|
|
of personal files, written in code that is easy to review and links
|
|
well reliable GNU/Linux components.
|
|
|
|
Tomb's ambition is to improve safety by way of:
|
|
|
|
- a minimalist design consisting in small and well readable code
|
|
- facilitation of good practices, i.e: key/storage physical separation
|
|
- adoption of a few standard and well tested implementations.
|
|
|
|
At present, Linux Tomb consists of a simple shell script (Zsh) using
|
|
standard filesystem tools (GNU) and the cryptographic API of the Linux
|
|
kernel (cryptsetup and LUKS). It can also produce machine parsable
|
|
output to facilitate its use inside graphical applications.
|
|
|
|
Starting with the 3.0 release path, also a new [Portable Tomb](portable) script
|
|
is made available (under development) which works on more operating systems beyond Linux based, is written in POSIX shell, has less dependencies and features and is based on [Veracrypt](https://www.veracrypt.fr) instead of LUKS/cryptsetup.
|
|
|
|
# How does it work?
|
|
|
|
To create a Tomb, do:
|
|
```
|
|
$ tomb dig -s 100 secret.tomb
|
|
$ tomb forge secret.tomb.key
|
|
$ tomb lock secret.tomb -k secret.tomb.key
|
|
```
|
|
To open it, do
|
|
```
|
|
$ tomb open secret.tomb -k secret.tomb.key
|
|
```
|
|
and after you are done
|
|
```
|
|
$ tomb close
|
|
```
|
|
or if you are in a hurry
|
|
```
|
|
$ tomb slam all
|
|
```
|
|
|
|
```
|
|
Syntax: tomb [options] command [arguments]
|
|
|
|
Commands:
|
|
|
|
// Creation:
|
|
dig create a new empty TOMB file of size -s in MiB
|
|
forge create a new KEY file and set its password
|
|
lock installs a lock on a TOMB to use it with KEY
|
|
|
|
// Operations on tombs:
|
|
open open an existing TOMB (-k KEY file or - for stdin)
|
|
index update the search indexes of tombs
|
|
search looks for filenames matching text patterns
|
|
list list of open TOMBs and information on them
|
|
ps list of running processes inside open TOMBs
|
|
close close a specific TOMB (or 'all')
|
|
slam slam a TOMB killing all programs using it
|
|
resize resize a TOMB to a new size -s (can only grow)
|
|
|
|
// Operations on keys:
|
|
passwd change the password of a KEY (needs old pass)
|
|
setkey change the KEY locking a TOMB (needs old key and pass)
|
|
|
|
// Backup on paper:
|
|
engrave makes a QR code of a KEY to be saved on paper
|
|
|
|
// Steganography:
|
|
bury hide a KEY inside a JPEG image (for use with -k)
|
|
exhume extract a KEY from a JPEG image (prints to stdout)
|
|
cloak transform a KEY into a TEXT using CIPHER (for use with -k)
|
|
uncloak extract a KEY from a TEXT file using CIPHER (prints to stdout)
|
|
|
|
Options:
|
|
|
|
-s size of the tomb file when creating/resizing one (in MiB)
|
|
-k path to the key to be used ('-k -' to read from stdin)
|
|
-n don't process the hooks found in tomb
|
|
-o options passed to commands: open, lock, forge (see man)
|
|
-f force operation (i.e. open even if swap is active)
|
|
-g use a GnuPG key to encrypt a tomb key
|
|
-r provide GnuPG recipients (separated by comma)
|
|
-R provide GnuPG hidden recipients (separated by comma)
|
|
--kdf forge keys armored against dictionary attacks
|
|
|
|
-h print this help
|
|
-v print version, license and list of available ciphers
|
|
-q run quietly without printing information
|
|
-D print debugging information at runtime
|
|
```
|
|
|
|
# What is this for, exactly?
|
|
|
|
This tool can be used to dig .tomb files, forge keys protected by a
|
|
password and use the keys to lock the tombs. Tombs are like single
|
|
files whose contents are inaccessible in the absence of the key they
|
|
were locked with and its password.
|
|
|
|
Once open, the tombs are just like normal folders and can contain
|
|
different files, plus they offer advanced functionalities like bind
|
|
and execution hooks and fast search, or they can be slammed close even
|
|
if busy. Keys can be stored on separate media like USB sticks, NFC,
|
|
on-line SSH servers or bluetooth devices to make the transport of data
|
|
safer: one always needs both the tomb and the key, plus its password,
|
|
to access it.
|
|
|
|
The tomb script takes care of several details to improve user's
|
|
behaviour and the security of tombs in everyday usage: protects the
|
|
typing of passwords from keyloggers, facilitates hiding keys inside
|
|
images, indexes and search a tomb's contents, mounts directories in
|
|
place, lists open tombs and selectively closes them, warns the user
|
|
about free space and last time usage, etc.
|
|
|
|
# How secure is this?
|
|
|
|
Death is the only sure thing in life. That said, Tomb is a pretty
|
|
secure tool especially because it is kept minimal, its source is
|
|
always open to review (even when installed) and its code is easy to
|
|
read with a bit of shell script knowledge.
|
|
|
|
All encryption tools being used in Tomb are included as default in
|
|
many GNU/Linux operating systems and therefore are regularly peer
|
|
reviewed: we don't add anything else to them really, just a layer of
|
|
usability.
|
|
|
|
The file [KNOWN_BUGS.md](KNOWN_BUGS.md) contains some notes on known
|
|
vulnerabilities and threat model analysis.
|
|
|
|
In absence or malfunction of the Tomb script it is always possible to
|
|
access the contents of a Tomb only using a dm-crypt enabled Linux
|
|
kernel, cryptsetup, GnuPG and any shell interpreter issuing the
|
|
following commands as root:
|
|
```
|
|
lo=$(losetup -f)
|
|
losetup -f secret.tomb
|
|
gpg -d secret.key | head -c -1 | cryptsetup --key-file - luksOpen $lo secret
|
|
mount /dev/mapper/secret /mnt
|
|
```
|
|
One can change the last argument `/mnt` to where the Tomb has to be
|
|
mounted and made accessible. To close the tomb then use:
|
|
```
|
|
umount /mnt
|
|
cryptsetup luksClose /dev/mapper/secret
|
|
```
|
|
|
|
# Stage of development
|
|
|
|
Tomb is an evolution of the 'mknest' tool developed for the
|
|
[dyne:bolic](http://www.dynebolic.org) 100% Free GNU/Linux
|
|
distribution in 2001: its 'nesting' mechanism allowed the liveCD users
|
|
to encrypt and make persistent home directories. Since then the same
|
|
shell routines kept being maintained and used for dyne:bolic until
|
|
2007, when they were ported to work on more GNU/Linux distributions.
|
|
|
|
As of today, Tomb is a very stable tool also used in mission critical
|
|
situations by a number of activists in dangerous zones. It has been
|
|
reviewed by forensics analysts and it can be considered safe for
|
|
adoption where the integrity of information stored depends on the
|
|
user's behaviour and the strength of a standard AES-256 (XTS plain)
|
|
encryption algorithm (current default) or, at one's option, other
|
|
equivalent standards supported by the Linux kernel.
|
|
|
|
## Compatibility
|
|
|
|
Tomb can be used in conjunction with some other software applications,
|
|
some are developed by Dyne.org, but some also by third parties.
|
|
|
|
It works well inside the Windows Subsystem for Linux starting from the
|
|
Windows 11 release since that supports mounting loopback volumes.
|
|
|
|
Portable Tomb extends support to Apple/OSX systems and FreeBSD.
|
|
|
|
### Included extra applications
|
|
|
|
These auxiliary applications are found in the extras/ subdirectory of
|
|
distributed Tomb's sourcecode:
|
|
|
|
- [GTomb](extras/gtomb) is a graphical interface using zenity
|
|
- [gtk-tray](extras/gtk-tray) is a graphical tray icon for GTK panels
|
|
- [qt-tray](extras/qt-tray) is a graphical tray icon for QT panels
|
|
- [tomber](extras/tomber) is a wrapper to use Tomb in Python scripts
|
|
- [docker](extras/docker) is a wrapper to use Tomb through Docker
|
|
|
|
|
|
|
|
### External applications
|
|
|
|
The following applications are not included in Tomb's distributed
|
|
sourcecode, but are known and tested to be compatible with Tomb:
|
|
|
|
- [pass-tomb](https://github.com/roddhjav/pass-tomb) is a console based wrapper of the excellent password keeping program [pass](https://www.passwordstore.org) that helps to keep the whole tree of password encrypted inside a tomb. It is written in Bash.
|
|
|
|
- [Secrets](https://secrets.dyne.org) is a software that can be operated on-line and on-site to split a Tomb key in shares to be distributed to peers: some of them have to agree to combine back the shares in order to retrieve the key.
|
|
|
|
- [zuluCrypt](https://mhogomchungu.github.io/zuluCrypt/) is a graphical application to manage various types of encrypted volumes on GNU/Linux, among them also Tombs, written in C++.
|
|
|
|
- [Mausoleum](https://github.com/mandeep/Mausoleum) is a graphical interface to facilitate the creation and management of tombs, written in Python.
|
|
|
|
If you are writing a project supporting Tomb volumes or wrapping Tomb, let us know!
|
|
|
|
|
|
## Compliancy
|
|
|
|
Tomb qualifies as sound for use on information rated as "top secret"
|
|
when used on an underlying stack of carefully reviewed hardware
|
|
(random number generator and other components) and software (Linux
|
|
kernel build, crypto modules, device manager, compiler used to built,
|
|
shell interpreter and packaged dependencies).
|
|
|
|
Tomb volumes are fully compliant with the FIPS 197 advanced encryption
|
|
standard published by NIST and with the following industry standards:
|
|
|
|
- Information technology -- Security techniques -- Encryption algorithms
|
|
- [ISO/IEC 18033-1:2015](http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=54530) -- Part 1: General
|
|
- [ISO/IEC 18033-3:2010](http://www.iso.org/iso/home/store/catalogue_ics/catalogue_detail_ics.htm?csnumber=54531) -- Part 3: Block ciphers
|
|
|
|
Tomb implementation is known to address at least partially issues raised in:
|
|
|
|
- Information technology -- Security techniques -- Key management
|
|
- [ISO/IEC 11770-1:2010](http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=53456) -- Part 1: Framework
|
|
- [ISO/IEC 11770-2:2008](http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=46370) -- Part 2: Mechanisms using symmetric techniques
|
|
- [ISO/IEC 27005:2011](http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=56742) Information technology -- Security techniques -- Information security risk management
|
|
- [ISO/IEC 24759:2014](http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=59142) Information technology -- Security techniques -- Test requirements for cryptographic modules
|
|
|
|
Any help on further verification of compliancy is very welcome, as the
|
|
access to ISO/IEC document is limited due to its expensive nature.
|
|
|
|
|
|
# Use stable releases in production!
|
|
|
|
Anyone planning to use Tomb to store and access secrets should not use
|
|
the latest development version in Git, but use instead the .tar.gz
|
|
release on https://files.dyne.org/tomb . The stable version will
|
|
always ensure backward compatibility with older tombs: we make sure it
|
|
creates sane tombs and keys by running various tests before releasing
|
|
it. The development version in Git might introduce sudden bugs and is
|
|
not guaranteed to produce backward- or forward-compatible tombs and keys.
|
|
The development version in Git should be used to report bugs, test new
|
|
features and develop patches.
|
|
|
|
So be warned: do not use the latest Git version in production
|
|
environments, but use a stable release versioned and packed as
|
|
tarball on https://files.dyne.org/tomb
|
|
|
|
|
|
|
|
# How can you help
|
|
|
|
Donations are very welcome, please go to https://www.dyne.org/donate
|
|
|
|
Translations are also welcome: they can be contributed editing sending
|
|
the .po files in [extras/translations](extras/translations).
|
|
|
|
The code is pretty short and readable. There is also a collection of
|
|
specifications and design materials in the [doc](doc) directory.
|
|
|
|
To contribute code and reviews visit https://github.com/dyne/Tomb
|
|
|
|
If you plan to commit code into Tomb, please keep in mind this is a
|
|
minimalist tool and its code should be readable. Guidelines on the
|
|
coding style are illustrated in [doc/HACKING.txt](doc/HACKING.txt).
|
|
|
|
# Licensing
|
|
|
|
Tomb is Copyright (C) 2007-2022 by the Dyne.org Foundation and
|
|
maintained by [Jaromil](/jaromil). More information on all
|
|
the developers involved is found in the [AUTHORS](AUTHORS.md) file.
|
|
|
|
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.
|