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Product presentation

MnemoPwd is a client-server application to store and retrieve secret information. It is based on OpenSSL cryptographic library and its installation is required both on the client side and the server side.

MnemoPwd use a fork of the PyElliptic module developped by Yann GUIBET under BSD License, that is a high level wrapper of OpenSSL (see https://github.com/yann2192/pyelliptic).

See https://www.openssl.org ("OpenSSL Homepage") web site for more information.

Require Python 3.4.4 or newer, OpenSSL (not compatible with version > 1.0.x), GNU/Linux or macOS

Copyright (c) 2015-2017, Thierry Lemeunier <thierry at lemeunier dot net> under BSD Licence

Features

• Double level of connection security: the SSL/TLS protocol and the application protocol
• Server identity can be controlled by X.509 certificate (optional TLS feature)
• Client and server share a master secret via ECDH scheme
• Each secret information is encrypted with the ECIES scheme
• Integrity is controlled by two HMAC (ECIES scheme + a 512-bits HMAC per block)
• Possibility of three stages of data encryption by client's configuration
• Keys are computed on the fly by the client and the server
• Keys are never stored by the server or by the client
• Do some self-controls before starting
• IP Auto-configuration at first launch (if server and client are on same private LAN)
• Configuration by file and/or by command line options
• Some colours on client interface (see the configuration file)
• Server running in background (only on POSIX systems)
• Importation / exportation in clear text or cypher text
• UML model of the secure application protocol (see https://github.com/thethythy/Mnemopwd)

Installation (and uninstalling)

They are two installation modes:

• PIP Installation

With PIP just hit in a terminal: pip install MnemoPwd For uninstalling just hit in a terminal: pip uninstall MnemoPwd

For more information about PIP see https://pip.readthedocs.io/.

• Source Installation

You can get the ZIP archive from GitHub (https://github.com/thethythy/Mnemopwd) using the button Clone or download. Just unzip the archive file and go in the source directory. For uninstalling, delete the ZIP archive and the source directory.

Configuration

Server configuration

The server use ~/.mnemopwds as configuration file. This file is automatically created at the first launch if it does not already exist. You can edit this file, for example, to indicate a private key file and a certificate file. You can change the following options:

• Host IP (by default it is the address in the local network);
• Log level;
• Private key file and certificate file (none by default);
• Host port (62230 by default);
• Path to the database directory (by default it is ~/mnemopwddata);
• Some other options about logging.

Secret information are always left encrypted in the database in ~/mnemopwddata directory. This directory contains also log files. This directory is accessible only for the user who launch the server.

You can also change some options on the command line. Use option -h or --help to get a help screen. The command line has priority over configuration file.

Client configuration

The client use ~/.mnemopwdc as configuration file. This file is automatically created at the first launch if it does not already exist. You can edit this file, for example, to indicate a shared certificate file. You can change the following options:

• Shared certificate file (none by default);
• Server IP (found by auto-configuration in the case of a private LAN);
• Server port (found by auto-configuration in the case of a private LAN);
• Lock screen timeout (one minute by default);
• Cryptographic suites (by default one stage with sect571r1 and aes-256-cbc).
• Colours of user interface if available

The user can define in the configuration file three stages of encryption. There is one stage defined by default. Paranoiac users can add one or two stages of encryption but it will be more slow to encrypt and to decrypt secret information...

You can also change some options on the command line. Use option -h or --help to get a help screen. The command line has priority over configuration file.

Usage

Start a server or client from PIP installation

Start a server

mnemopwds -h --> get a help screen

mnemopwds --start --> start the server

mnemopwds [--status] --> get a status message

mnemopwds --stop --> stop the server

Start a client

mnemopwdc -h --> get a help screen

mnemopwdc --> start the client

mnemopwdc --status --> get a status message

Start a server or a client from the source directory

You can use python3 mnemopwds.py for launching the server. You can also change the execution property of the server launcher with chmod +x mnemopwds.py and then use directly ./mnemopwds.py. You can do the same things for client launcher (mnemopwdc.py).

Certificate usage

To authenticate the server, a X.509 certificate can be used. You can use an existing certificate or use a new self-signed certificate created with OpenSSL. In the last case, please follow next steps:

1. Generate a self-signed certificate: in a terminal, launch the next command line

   openssl req -x509 -new -utf8 -nodes -out mnemopwdcert -keyout mnemopwdkey

   where mnemopwdcert is the certificate file to share and mnemopwdkey is the private key file to keep secret (never shared this file).

   See https://www.openssl.org/docs/manmaster/apps/req.html for more information.

2. Move certificate file and key file in a secure directory on server (I recommend the ~/mnemopwddata directory created by the server application the first start you launch it).

3. The certificate file (mnemopwdcert) must be copy on each client computer to share it.

4. Finally, indicate to the server the -c and -k options and to the client the -c option or modify configuration files (by default ~/.mnemopwds for server and ~/.mnemopwdc for client). For example (stop server if it is already started):

   mnemopwds --start -c /path/to/mnemopwdcert -k /path/to/mnemopwdkey --> start the server using SSl/TLS identity control mechanism

   mnemopwdc -c /path/to/mnemopwdcert --> start the client with the same certificate file to control server identity