gPass/firefox_addon

gPass : global Password

Introduction

Everyday we have a lot of passwords to manage corresponding to a lot of accounts we use. It's hard to remain all of these, moreover if we don't use it often. So, what most people do is to generate only a subset of passwords easy to remain. This implies two common errors :

• Password are not very strong
• We use them for multiple accounts

The best way to avoid these errors is to have a unique strong password for each account. gPass helps to reach this goal : you keep a subset of passwords (called masterkey) and for each login/password tuple you chose, gPass returns the real password by querying a password server.

To have a high level of security, all information is stored encrypted (server side). Nothing is stored on client. The decryption is done on the fly when it's needed and only with user input. So, a hacker can get your password database, it will not be able to see any information (except if it bruteforce your masterkey) ! So it's important to choose to strong masterkey !

This addon is like last pass one, but I wanted it to be open source and home hostable (be careful on server down !). Moreover, with gPass, you can have multiple master key !

Usage

The first thing to do is to populate your database (from your/a password server) with login/password/master key values. If you want to make strong password, there is a password generator. After that, configure your addon in "tools -> addons -> gPass -> preferences" to point to your password server (+ username).

When you're in a login form and you want to use gPass, type your login and fill "@@masterkey" in password field. Then submit and password will automatically be replaced by the one in the database (after addon decrypt it).

Technical details

The two columns in database are "login" and "password". login is compounded by "@@domain;login" encrypted with AES 256 password is salted and encrypted with AES 256

The key that encrypt these fields is PKBDF2(hmac-sha256, masterkey, password_server_url, 1000, 256)

For now the only addons made is for firefox. Server side is written in PHP (with SQLite3 for database component).

Server

To host a password server, you need a webserver. Just copy server files in a directory read/write for web server user (www-data). A sample apache2 configuration file is available in ressources.

You can activate/deactivate view of ciphered passwords by setting $VIEW_CIPHERED_PASSWORDS in index.php.

You can activate/deactivate user creation by setting $ADMIN_MODE in index.php.

A demonstration server is available here. It's the default server of XPI package (user demo).

Client

Just install xpi package. You can have debug information by setting DEBUG in main.js (use it with firefox addon sdk).

Licence

All the code is licenced under GPL v3. Source code is available here.