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SPHINX password protocol

Project description

<!– SPDX-FileCopyrightText: 2018, Marsiske Stefan

SPDX-License-Identifier: CC-BY-SA-4.0 –>

sphinx: a password S tore that P erfectly H ides from I tself (N o X aggeration)

pwdsphinx is python wrapper around libsphinx - a cryptographic password storage as described in https://eprint.iacr.org/2015/1099

## Dependencies

You need [libsphinx](https://github.com/stef/libsphinx).

You need also to install pysodium using either your OS package manager or pip.

If you want to use also the websphinx browser extension you need to install also an X11 variant of pinentry from the gnupg project:

  • either apt-get install pinentry-qt
  • or apt-get install pinentry-gtk2
  • or apt-get install pinentry-gnome3
  • or apt-get install pinentry-fltk

(or anything equivalent to apt-get install on your OS)

## Installation

pip3 install pwdsphinx should get you started.

## API

sphinxlib is a ctypes-based python wrapper around [libsphinx](https://github.com/stef/libsphinx), so you can build whatever you fancy immediately in python. The interface exposed wraps the 3 sphinx functions from the library like this:

` def challenge(pwd) `

returns bfac and chal

` def respond(chal, secret) ` return the response

` def finish(pwd, bfac, resp) `

returns the raw 32 byte password.

## Server/Client

Since the sphinx protocol only makes sense if the “device” is somewhere else than where you type your password, pwdsphinx comes with a server implemented in py3 which you can host off-site from your usual desktop/smartphone. Also a client is supplied which is able to communicate with the server and manage passwords.

Both the client and the server can be configured by any of the following files:

  • /etc/sphinx/config
  • ~/.sphinxrc
  • ~/.config/sphinx/config
  • ./sphinx.cfg

Files are parsed in this order, this means global settings can be overridden by per-user and per-directory settings.

### oracle - the server

pwdsphinx comes with a python reference implementation of a extended sphinx server called oracle.

The server can be “configured” by changing the variables in the [server] section of the config file.

The address is the IP address on which the server is listening, default is localhost - you might want to change that.

The port where the server is listening is by default 2355.

datadir specifies the data directory where all the device “secrets” are stored, this defaults to “data/” in the current directory. You might want to back up this directory from time to time to an encrypted medium.

verbose enables logging to standard output.

Change these settings to fit your needs. Starting the server can be done simply by:

` ./oracle.py `

### sphinx - the client

This is the client that connects to the oracle to manage passwords using the extended sphinx protocol.

#### Client Configuration

Like the server, the client can be configured changing the settings in the [client] section of the config file. The host and port should match what you set in the server.

The datadir (default: ~/.sphinx) variable holds the location for your client parameters. Particularly it contains a masterkey which is used to derive secrets. The master key - if not available - is generated by issuing an init command. You might want to back up and encrypt the master key.

#### Operations

The client provides the following operations: Create, Get, Change, Commit, Undo, List, Delete, Read, Write. All operations need a username and a site this password belongs to, even if they’re only empty strings.

#### Create password

Creating a new password for a site is easy, pass your “master” password on standard input to the client, and provide parameters like in this example:

` echo 'my master password' | ./sphinx.py create username https://example.com ulsd 0 `

The parameters to the client are create for the operation, then username for the username on the site https://example.com then a combination of the letters ulsd and the 0 for the size of the final password. The letters ulsd stand in order for the following character classes: u upper-case letters, l lower-case letters, s symbols and d for digits. If the command runs successfully - the resulting new high-entropy password according to the given rules is printed to the console.

Note1, since the master password is not used to encrypt anything, you can actually use different “master” passwords for different user/site combinations.

Note2, using echo is only for demonstration, you should use something like this instead: ` echo GETPIN | pinentry | grep '^D' | cut -c3- | ./sphinx.py create username https://example.com ulsd 0 ` Using pinentry you can go fancy and do double password input, and even have something checking password quality for you, check it out, it’s quite versatile.

#### Get password

Getting a password from the sphinx oracle works by running the following command:

` echo 'my master password' | ./sphinx.py get username https://example.com `

Here again you supply your master password on standard input, provide the get operation as the first parameter, your username as the 2nd and the site as the 3rd parameter. The resulting password is returned on standard output.

#### Change password

You might want to (be forced to regularly) change your password, this is easy while you can keep your master password the unchanged (or you can change it too, if you want). The command is this:

` echo 'my master password' | ./sphinx.py change username https://example.com `

Here again you supply your master password on standard input. This master password can be the same, but can also be a new password if you want to change also the master password. You provide the change operation as the first parameter to the client, your username as the 2nd and the site as the 3rd parameter. Your new new password is returned on standard output.

#### Committing a changed password

After changing the password, you will still get the old password when running get. To switch to use the new password you have to commit the changes with

` echo 'my master password' | ./sphinx.py commit username https://example.com `

#### Undoing a password commit If you somehow messed up and have to go back to use the old password, you can undo committing your password using:

` echo 'my master password' | ./sphinx.py commit username https://example.com `

#### Deleting passwords

In case you want to delete a password, you can do using the following command:

` ./sphinx.py delete username https://example.com `

You provide the delete operation as the first parameter to the client, your username as the 2nd and the site as the 3rd parameter. This command does not need anything on standard input, nor does it provide anything on standard output in case everything goes well.

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