DisPass / manpage.rst

MANPAGE

SYNOPSIS

dispass

dispass [-ghoV?] [-f <labelfile>] [-s <string>] [--script]

dispass [-co] [-l <length>] [-a <algo>] [-n <sequence-number>] [--script] <label> [<label2>] [label3] [...]

gdispass

dispass-label

dispass-label [-hlV] [-f <labelfile>] [--script]

SUMMARY

DisPass is a passphrase generator for GNU/Linux, *BSD, MacOS X and Windows. It enables you to generate unique passphrases formed from a master password and a label, helping you get rid of the bad habit of using a single password for multiple websites. When using a different passphrase for every website, the chance of abuse of your password on other sites (when a website leaks it) is eliminated. Dispass is a console application, but also has a simple graphical interface.

DOCUMENTATION

label
A label is a string that you use to identify the passphrase. This can be a domainname of the service the passphrase is used for, e.g. 'google.com'.

Since this program asks for a password/passphrase to generate another password/passphrase, things may get a bit confusing. I've dediced to use the words 'password' and 'passphrase' diffently and consistent.

password
Use of the word 'password' is dedicated to the input password, i.e. the password you are asked to enter and only you know. Whenever you read password, this is the one I mean. The password needs to be at least 8 characters long and does not have a maximum length.
passphrase
With 'passphrase' I always mean the output passphrase, i.e. the passphrase that is unique and generated from a label, password and sequence number. Generated passphrases are 30 characters long. The length can be optionally changed.

When DisPass is executed as 'gdispass' or 'dispass -g', the graphical version will be started.

Using dispass to create one or more passphrases

You can start using dispass for e.g. google.com like this:

$ dispass google.com

The passphrases created are 30 characters long by default, but some website's may not validate such a long passphrase or you might want to make it even longer. You can easily set a desired passphrase length using the -l flag. Hotmail passwords are limited to 16 characters:

$ dispass -l 18 hotmail

Generating passphrases for multiple labels is just as easy:

$ dispass google hotmail YaHo0 "P0551bly*a81t)H4rd2rmbr"

Labels are case-sensitive and digits and special characters can be used. You should try to name labels in a way that you can easily 'dispass' a passphrase on any computer/device that has DisPass at any given moment. You are encouraged to store your labels in a labelfile for convenience though.

Labelfile location

When dispass is run without arguments it will try to find a labelfile. The location of this file varies and depends on the platform type you use, the file flag and the environment variables that may be set:

You can override the location of the labelfile using the -f flag. This can be a way for you to use different sets of labels/passphrases with a different 'master' password for each set.

  1. If -f flag is given, that value is used.
  2. If environment var DISPASS_LABELFILE is set, that value is used.
  3. If environment var XDG_DATA_HOME is set, $XDG_DATA_HOME/dispass/labels is used.
  4. If none of the above applies, the labelfile will default to the following locations:
    • GNU/Linux and Mac OS X: ~/.dispass/labels
    • *BSD and other Unixen: ~/.dispass/labels
    • Windows: C:\Users\<username>\dispass\labels

You can edit the labelfile(s) by using the dispass-label program.

Creating and searching stored labels

When creating a new label/password combination you can store the label and it's arguments by using the -c flag, this will ask for your password twice so you can be asured to avoid typing errors:

$ dispass -c -l 16 hotmail.com

Now you will be asked to enter a password twice and after that your passphrase will be shown on the screen. It can be re-created everytime you need it by searching for a label using the -s flag:

$ dispass -s hotm

Only part of the label is needed, as long as the (sub)string is unique.

OPTIONS

dispass

Options (general):

-c, --create use if this passphrase is new (check input PW)
-g, --gui start guided graphical version of DisPass
-h, --help show this help and exit
-o, --output output passphrases to stdout (instead of the more secure way of displaying via curses)
-V, --version show full version information and exit
--script optimize input/output for 'wrapping' dispass

Options (when using labelfile):

-s <string>, --search=<string>
 dispass label from file that uniquely matches <string>
-f <labelfile>, --file=<labelfile>
 set location of labelfile

Options (when passing labels as arguments):

-l <length>, --length=<length>
 set length of passphrase (default: 30, max: 171)
-a <algorithm>, --algo=<algorithm>
 override algorithm for generating passphrase(s)
-n <number>, --number=<number>
 override sequence number (default = 1)

dispass-label

-h, --help show help and exit
-l, --list print all labels and options found in labelfile
-V, --version show full version information and exit
-f <labelfile>, --file=<labelfile>
 set location of labelfile
--script optimize input/output for 'wrapping' dispass-label

Using the graphical gdispass application

You can start using gDisPass by running the gdispass executable. Fill in a name for the label that you can easily remember.

To generate a passphrase for a new label, i.e. a label that you have never used before, check the appropiate checkbox. This will allow you to enter the (master) password twice. gDisPass will then compare the passwords to see if they are the same. This is needed to minimize the risk of typos. It is advised that you check the box everytime you create a passphrase for a new label.

Subsequential generation of passphrases for the same label most probably do not need this check. You will likely be warned when/if you made a typo by the system or website you want to authenticate for.

If you correctly entered a label and password, you can generate the passphrase by pressing <Return> or by clicking the appropiate button. The resulting passphrase will be focused and selected. On platforms that support it (e.g. *BSD or GNU/Linux) the passphrase will be automatically placed into your copy/paste buffer.

Resetting all fields when you are done or when you need to quickly cancel the generation (because someone is watching over your shoulders) can be done by pressing <Escape> or by clicking the appropiate button.

Wrapping / scripting dispass

You can use dispass entirely as you wish and create different interfaces by using the appropiate libraries as long as it is allowed by the ISC license.

Dispass provides a way to make the behaviour and IO more suitable for scripting by passing the --script option.

dispass

If the --script flag is passed together with -o or --output the output will be optimized for easy parsing by other programs and scripts by always printing one entry on a single line using the following positions:

Column  1-50 : label

dispass-label

If the --script flag is passed together with -l or --list the output will be optimized for easy parsing by other programs and scripts by not printing the header and always printing one entry on a single line using the following positions:

Column  1-50: label           (50 chars wide)
Column 52-54: length           (3 chars wide)
Column 56-70: hash algo       (15 chars wide)
Column 72-74: sequence number  (3 chars wide)

Otherwise an ascii table is printed with a variable width depending on the length of the longest label. The table has a header but does not display the hash algo until support for multiple hashing algos is added.

Acknowledgements

Many thanks go out to Tom (ryuslash) Willemsen for valuable contributions to gdispass and the new algorithm. He also wrote an awesome wrapper for Emacs so you can use DisPass in your favorite editor.

SEE ALSO

Main website with full documentation
http://dispass.babab.nl
The cheeseshop (PyPI) project page
http://pypi.python.org/pypi/DisPass/
Github repository and Issue tracker
https://github.com/babab/DisPass/
IRC
#dispass at Freenode (chat.freenode.net)
Emacs wrapper
http://ryuslash.org/projects/dispass.el/
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