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276 lines
12 KiB
Markdown
276 lines
12 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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[](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 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 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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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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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. 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 coma)
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-R provide GnuPG hidden recipients (separated by coma)
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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 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 user's
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behaviour and the security of tombs in everyday usage: secures 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, lists open tombs and
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selectively closes them, warns the user about free space and last time
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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=$(losetup -f)
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losetup -f secret.tomb
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pass="$(gpg -d secret.key)"
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echo -n -e "$pass" | cryptsetup --key-file - luksOpen $lo secret
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mount /dev/mapper/secret /mnt
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unset pass
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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 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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## 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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- [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" 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).
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Tomb volumes are fully compliant with the FIPS 197 advanced encryption 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 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 needed: they can be contributed via this website
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https://poeditor.com/join/project/b276xMGAmB
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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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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) 2007-2017 by the Dyne.org Foundation and
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maintained by Denis Roio <jaromil@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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