mirror of
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308 lines
13 KiB
Markdown
308 lines
13 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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[](http://www.dyne.org)
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More information and 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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For the instructions on how to get started using Tomb, see [INSTALL](INSTALL.md).
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[](https://travis-ci.org/dyne/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 well reliable GNU/Linux components.
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Tomb's ambition is to improve safety by way of:
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- a minimalist design consisting in small and well readable code
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- facilitation of good practices, i.e: key/storage physical separation
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- adoption of a few standard and well tested implementations.
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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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```
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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 MiB
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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 (-k KEY file or - for stdin)
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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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ps list of running processes inside open TOMBs
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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 stdout)
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cloak transform a KEY into a TEXT using CIPHER (for use with -k)
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uncloak extract a KEY from a TEXT file using CIPHER (prints to stdout)
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Options:
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-s size of the tomb file when creating/resizing one (in MiB)
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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 options passed to commands: open, lock, forge (see man)
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-f force operation (i.e. open even if swap is active)
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-g use a GnuPG key to encrypt a tomb key
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-r provide GnuPG recipients (separated by comma)
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-R provide GnuPG hidden recipients (separated by comma)
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--kdf forge keys 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 this 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 encryption) and use the keys to lock
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the tombs. Tombs are like single files whose contents are inaccessible
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in the absence of the key they were locked with and its 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,
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on-line SSH servers or bluetooth devices to make the transport of data
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safer: one always needs both the tomb and the key, plus its password,
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to access it.
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The tomb script takes care of several details to improve user's
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behaviour and the security of tombs in everyday usage: protects the
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typing of passwords from keyloggers, facilitates hiding keys inside
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images, indexes and search a tomb's contents, mounts directories in
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place, lists open tombs and selectively closes them, warns the user
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about free space and last time usage, 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
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always open to review (even when installed) and its code is easy to
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read with a bit of shell script 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 file [KNOWN_BUGS.md](KNOWN_BUGS.md) contains some notes on known
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vulnerabilities and threat model analysis.
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In absence or malfunction of the Tomb script it is always possible to
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access the contents of a Tomb only using a dm-crypt enabled Linux
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kernel, cryptsetup, GnuPG and any shell interpreter issuing the
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following commands as root:
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```
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lo=$(losetup -f)
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losetup -f secret.tomb
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gpg -d secret.key | head -c -1 | cryptsetup --key-file - luksOpen $lo secret
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mount /dev/mapper/secret /mnt
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```
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One can change the last argument `/mnt` to where the Tomb has to be
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mounted and made accessible. To close the tomb then use:
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```
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umount /mnt
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cryptsetup luksClose /dev/mapper/secret
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```
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# Stage of development
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Tomb is an evolution of the 'mknest' tool developed for the
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[dyne:bolic](http://www.dynebolic.org) 100% Free GNU/Linux
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distribution in 2001: its 'nesting' mechanism allowed the liveCD users
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to encrypt and make persistent home directories. Since then the same
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shell routines kept being maintained and used for dyne:bolic until
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2007, when they were ported to work on more 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 safe for
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adoption where the integrity of information stored depends on the
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user's behaviour and the strength of a standard AES-256 (XTS plain)
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encryption algorithm (current default) or, at one's option, other
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equivalent standards supported by the Linux kernel.
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## Compatibility
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Tomb can be used in conjunction with some other software applications,
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some are developed by Dyne.org, but some also by third parties.
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### Included extra applications
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These auxiliary applications are found in the extras/ subdirectory of
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distributed Tomb's sourcecode:
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- [GTomb](extras/gtomb) is a graphical interface using zenity
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- [gtk-tray](extras/gtk-tray) is a graphical tray icon for GTK panels
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- [qt-tray](extras/qt-tray) is a graphical tray icon for QT panels
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- [tomber](extras/tomber) is a wrapper to use Tomb in Python scripts
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- [docker](extras/docker) is a wrapper to use Tomb through Docker
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### External applications
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The following applications are not included in Tomb's distributed
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sourcecode, but are known and tested to be compatible with Tomb:
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- [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.
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- [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++.
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- [Mausoleum](https://github.com/mandeep/Mausoleum) is a graphical interface to facilitate the creation and management of tombs, written in Python.
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- [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.
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If you are writing a project supporting Tomb volumes or wrapping Tomb, let us know!
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## Compliancy
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Tomb qualifies as sound for use on information rated as "top secret"
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when used on an underlying stack of carefully reviewed hardware
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(random number generator and other components) and software (Linux
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kernel build, crypto modules, device manager, compiler used to built,
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shell interpreter and packaged dependencies).
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Tomb volumes are fully compliant with the FIPS 197 advanced encryption
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standard published by NIST and with the following industry standards:
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- Information technology -- Security techniques -- Encryption algorithms
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- [ISO/IEC 18033-1:2015](http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=54530) -- Part 1: General
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- [ISO/IEC 18033-3:2010](http://www.iso.org/iso/home/store/catalogue_ics/catalogue_detail_ics.htm?csnumber=54531) -- Part 3: Block ciphers
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Tomb implementation is known to address at least partially issues raised in:
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- Information technology -- Security techniques -- Key management
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- [ISO/IEC 11770-1:2010](http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=53456) -- Part 1: Framework
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- [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
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- [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
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- [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
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Any help on further verification of compliancy is very welcome, as the
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access to ISO/IEC document is limited due to its expensive nature.
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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 very welcome, please go to https://www.dyne.org/donate
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Translations are also welcome: they can be contributed editing sending
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the .po files in [extras/translations](extras/translations).
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The code is pretty short and readable. There is also a collection of
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specifications and design materials in the [doc](doc) directory.
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To contribute code and reviews visit https://github.com/dyne/Tomb
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If you plan to commit code into Tomb, please keep in mind this is a
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minimalist tool and its code should be readable. Guidelines on the
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coding style are illustrated in [doc/HACKING.txt](doc/HACKING.txt).
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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** (or direct port 9999 SSL)
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# Licensing
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Tomb is Copyright (C) 2007-2021 by the Dyne.org Foundation and
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maintained by Denis Roio <J@dyne.org>. More information on all
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the developers involved is found in the [AUTHORS](AUTHORS.md) file.
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This source code is free software; you can redistribute it and/or
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modify it under the terms of the GNU Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This source code is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Please refer
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to the GNU Public License for more details.
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You should have received a copy of the GNU Public License along with
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this source code; if not, write to: Free Software Foundation, Inc.,
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675 Mass Ave, Cambridge, MA 02139, USA.
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