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234 lines
9.0 KiB
Markdown
234 lines
9.0 KiB
Markdown
..... ..
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.H8888888h. ~-. . uW8"
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888888888888x `> u. .. . : `t888
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X~ `?888888hx~ ...ue888b .888: x888 x888. 8888 .
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' x8.^"*88*" 888R Y888r ~`8888~'888X`?888f` 9888.z88N
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`-:- X8888x 888R I888> X888 888X '888> 9888 888E
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488888> 888R I888> X888 888X '888> 9888 888E
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.. `"88* 888R I888> X888 888X '888> 9888 888E
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x88888nX" . u8888cJ888 X888 888X '888> 9888 888E
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!"*8888888n.. : "*888*P" "*88%""*88" '888!` .8888 888"
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' "*88888888* 'Y" `~ " `"` `%888*%"
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^"***"` "`
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*A minimalistic commandline tool to manage encrypted volumes* aka **The Crypto Undertaker**
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Latest stable version: **2.0**
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Updates on website: https://www.dyne.org/software/tomb
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Get the stable .tar.gz signed release for production use!
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Download it from https://files.dyne.org/tomb
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# What is Tomb, the crypto undertaker?
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Tomb aims to be a free and open source system for easy encryption and
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backup of personal files, written in code that is easy to review and
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links shared GNU/Linux components.
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At present, Tomb consists of a simple shell script (Zsh) using
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standard filesystem tools (GNU) and the cryptographic API of the Linux
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kernel (cryptsetup and LUKS). Tomb can also produce machine parsable
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output to facilitate its use inside graphical applications.
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# How does it work?
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To create a Tomb, do:
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```
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$ tomb dig -s 100 secret.tomb
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$ tomb forge secret.tomb.key
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$ tomb lock secret.tomb -k secret.tomb.key
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```
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To open it, do
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```
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$ tomb open secret.tomb -k secret.tomb.key
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```
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and after you are done
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```
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$ tomb close
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```
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or if you are in a hurry
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```
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$ tomb slam all
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```
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For the instructions on how to get started using Tomb, see [INSTALL](INSTALL.md).
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```
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Syntax: tomb [options] command [arguments]
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Commands:
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// Creation:
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dig create a new empty TOMB file of size -s in MB
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forge create a new KEY file and set its password
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lock installs a lock on a TOMB to use it with KEY
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// Operations on tombs:
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open open an existing TOMB
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index update the search indexes of tombs
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search looks for filenames matching text patterns
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list list of open TOMBs and information on them
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close close a specific TOMB (or 'all')
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slam slam a TOMB killing all programs using it
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resize resize a TOMB to a new size -s (can only grow)
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// Operations on keys:
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passwd change the password of a KEY (needs old pass)
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setkey change the KEY locking a TOMB (needs old key and pass)
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// Backup on paper:
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engrave makes a QR code of a KEY to be saved on paper
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// Steganography:
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bury hide a KEY inside a JPEG image (for use with -k)
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exhume extract a KEY from a JPEG image (prints to stout)
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Options:
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-s size of the tomb file when creating/resizing one (in MB)
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-k path to the key to be used ('-k -' to read from stdin)
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-n don't process the hooks found in tomb
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-o mount options used to open (default: rw,noatime,nodev)
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-f force operation (i.e. even if swap is active)
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--kdf generate passwords armored against dictionary attacks
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-h print this help
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-v print version, license and list of available ciphers
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-q run quietly without printing informations
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-D print debugging information at runtime
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```
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# What is it for, exactly?
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This tool can be used to dig .tomb files (LUKS volumes), forge keys
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protected by a password (GnuPG symmetric encryption) and use the keys
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to lock the tombs. Tombs are like single files whose contents are
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inaccessible in the absence of the key they were locked with and its
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password.
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Once open, the tombs are just like normal folders and can contain
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different files, plus they offer advanced functionalities like bind
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and execution hooks and fast search, or they can be slammed close even
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if busy. Keys can be stored on separate media like USB sticks, NFC, or
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bluetooth devices to make the transport of data safer: one always
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needs both the tomb and the key, plus its password, to access it.
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The tomb script takes care of several details to improve the security
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of tombs in everyday usage: adopting PIN entry for passwords,
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facilitating the storage of backup keys using image steganography,
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listing open tombs and selectively closing them, warning the user
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about their size and last time they were used, etc.
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# How secure is this?
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Death is the only sure thing in life. That said, Tomb is a pretty
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secure tool especially because it is kept minimal, its source is always
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open, and its code is easy to review with a bit of shell script
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knowledge.
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All encryption tools being used in Tomb are included as default in
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many GNU/Linux operating systems and therefore are regularly peer
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reviewed: we don't add anything else to them really, just a layer of
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usability.
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The code of Tomb can be read in a literate programming style on
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http://tomb.dyne.org/literate
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# Stage of development
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Tomb is an evolution of the 'mknest' tool developed for the dyne:bolic
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GNU/Linux distribution, which is used by its 'nesting' mechanism to
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encrypt the Home directory of users, a system implemented already in
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2001. Since then, the same shell routines kept being maintained and in
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2007, they were adapted to work on various other GNU/Linux distributions.
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As of today, Tomb is a very stable tool also used in mission critical
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situations by a number of activists in dangerous zones. It has been
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reviewed by forensics analysts and it can be considered to be safe for
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military grade use where the integrity of information stored depends
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on the user's behaviour and the strength of a standard AES-256 (XTS
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plain) encryption algorithm.
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# Use stable releases in production!
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Anyone planning to use Tomb to store and access secrets should not use
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the latest development version in Git, but use instead the .tar.gz
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release on https://files.dyne.org/tomb . The stable version will
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always ensure backward compatibility with older tombs: we make sure it
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creates sane tombs and keys by running various tests before releasing
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it. The development version in Git might introduce sudden bugs and is
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not guaranteed to produce backward- or forward-compatible tombs and keys.
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The development version in Git should be used to report bugs, test new
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features and develop patches.
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So be warned: do not use the latest Git version in production
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environments, but use a stable release versioned and packed as
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tarball on https://files.dyne.org/tomb
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# How can you help
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Donations are always welcome, see https://www.dyne.org/donate
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Translations are also needed: they can be contributed via this website
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https://poeditor.com/join/project?hash=33bdefea2e46b26f512a0caae55fbbb5
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or simply sending the .po file. Start from `extras/po/tomb.pot`.
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The code is pretty short and readable: start looking around and the
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materials found in `doc/` which are good pointers at security measures
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to be further implemented.
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For the bleeding edge visit https://github.com/dyne/Tomb
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Tomb's developers can be contacted using the issues on GitHub or over
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IRC on https://irc.dyne.org channel **#dyne**
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Some enthusiastic ideas are in the [TODO](doc/TODO.org) file.
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Information on developers involved is found in the [AUTHORS](AUTHORS.md) file.
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# Can Tomb be used inside other applications?
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Sure as Hell it can! Licensing issues aside ([GNU GPLv3+](COPYING)
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terms) Tomb provides machine-readable output and interaction via some flags:
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flag | function
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-------------------- | ------------------------------------------------
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--no-color | avoids coloring output to allow parsing
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--unsecure-dev-mode | allows giving passwords as argument
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--tomb-pwd | specify the key password as argument
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--tomb-old-pwd | specify the old key password as argument
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--sudo-pwd | specify the sudo password as argument
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Yet please consider that these flags may introduce vulnerabilities as
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process table scanning can reveal passwords while such commands are
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executing. For passwords in particular the best is always let Tomb
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gather them via pinentry.
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## Python
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A Python wrapper is under developed and already usable, but it
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introduces the vulnerabilities mentioned above. Find it in
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`extras/tomber`. For more information see [PYTHON](extras/PYTHON.md).
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## Graphical applications
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So far the only graphical application supporting Tomb volumes is
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[ZuluCrypt](https://github.com/mhogomchungu/zuluCrypt). One needs to
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activate the Tomb plugin included in its source and will be able to
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create, open and close tombs. It might still miss advanced Tomb
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functionalities that are only available from the command-line.
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## Let us know!
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If you plan to develop any kind of wrapper for Tomb you are welcome to
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let us know. Tomb is really meant to be maintained as a minimal tool
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for long-term compatibility when handling something so delicate as our
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secrets. For anything else we rely on your own initiative.
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Happy hacking! :&^)
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