gPass 1.3 CRX for Chrome

A Free Accessibility Extension

Published By soutade

gPass (pdmhjekonpgonlpdpgehaoekfpbmligk): gPass : global password manager ... Read More > or Download Now >

gPass for Chrome

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71.10 KB


Tech Specs

  • • Type: Browser Extension
  • • Latest Version: 1.3
  • • Price: Freeware
  • • Offline: No
  • • Developer: soutade

User Reviews

  • ★★★★☆
  • • Rating Average
  • 4.25 out of 5
  • • Rating Users
  • 4

Download Count

  • • Total Downloads
  • 22
  • • Current Version Downloads
  • 2
  • • Updated: April 28, 2024

gPass is a free Accessibility Extension for Chrome. You could download the latest version crx file or old version crx files and install it.

More About gPass

gPass : global Password for Firefox and Chrome


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 brute force your masterkey) ! So it's important to choose to strong masterkey !

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


The first thing to do is to populate your database (from your/a password server) with website/login/password/master key values. You can use "*" character to access to all sub domains of a specific website. If you want to make strong password, there is a password generator. After that, configure your addon in "tools -> addons -> gPass -> preferences" in Firefox or "addons -> gPass -> options" in Chrome to point to your password server (+ username). Be careful, login and password are case sensitive.

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

You can also type "@_masterkey" to only replace your password without submitting and manually submit. This allows to support more websites.

Technical details

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

The key that encrypt these fields is PBKDF2 (hmac-sha256, masterkey, password_server_url, 1000, 256), IV is PBKDF2 (hmac-sha256, password_server_url, masterkey, 1000, 256)

PBKDF2 level can be changed by user

Server side is written in PHP (with SQLite3 for database component).


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 resources. Since v0.8 and the use of Crypto API, it's manadatory to have an HTTPS access to the server. Without that, the decryption will fails.

Configuration parameters are in conf.php

A demonstration server is available at It may not works with HTTPS content because it uses a self-signed SSL certificate. If so, explicitly add the certificate to your browser. It's the default server of package (user demo).

Warning The master key derivation is partially based on account URL. So it's linked to your current server information. You can't move databases from servers with different URLs, you need to export them and import again.

Server side is available at

Version 0.6 introduces shadow logins. It's a protection again illegal database dump and purge but requires high cpu bandwidth. Database update is transparent.

The principle is to generate a random value (shadow login) that must be encrypted with the masterkey to get an access token. This access token allows to get the true (but encrypted) login/password couple. It's a kind of challenge : if I can encrypt the shadow login, I know the masterkey ! For security reason, the derivation of masterkey for deciphering passwords is different than for encrypting shadow logins (it uses its own salt).


Just install the package. You can have debug information by setting DEBUG in main.js.

Command line interface

A command line interface is also available with the following usage :

Usage: ./gpass_cli [-f config_file] [-p server_port] [-c CA_certificate_path] [-l PBKDF2_level] [-s gpass_server] [-v] -d domain -u username

You can save recurrent parameters into a configuration file. Default config file is found at $HOME/.local/share/gpass/gpass.ini

The dependencies are libcurl and OpenSSL (-dev packages : ie _libcurl4-openssl-dev_ and _libssl-dev_)

A sample configuration file is available _gpass.ini.sample_

Version Information

Current version is 0.8.2 (not compatible with 0.7)

Firefox will remove support for addons, so the gPass addon code is not supported since v0.8, please migrate to webextension.

Transition from v0.7 to v0.8 : Please update your masterkey (even with the same one) to gain a security level of your passwords's wallet.


All the code is licensed under GPL v3. Source code is available at

Privacy Policy

Privacy Policy can be found at

**v0.8.2 :**


* Error in wildcard domain generation
* Forgot some console.log in code (replace it with debug function)


v0.8.1 :


* Scroll to page bottom when user adds a new password
* Run a simpler algorithm for wildcard domains


* Add Privacy Policy information


* Run a simpler algorithm for wildcard domains

v0.8 :


* Clear master keys and reset passwords after 15 minutes of inactivity
* Set USE_SHADOW_LOGINS by default
* New crypto scheme (Use CBC chaining and fix a security problem with salt) and protocol v4. not backward compatible with v3
* Add QUnit tests
* New password form is now on top of the page
* Add a button to go to the top of the page when scrolling
* Add simple password button
* Rework password generation for most user friendly passwords (less special characters, more letters)


* New webextension for Firefox is provided. It shares most of code with Chrome extension and use native crypto API
* Block connection when masterkey is sent in clear (password replacement failed). **Doesn't work with Firefox**


* Add command line interface (CLI)

v0.7 :


* Fix a bug for Chrome browser (doesn't support default parameters)
* Display an error message when a query fails
* You can now export clear password database (only unciphered passwords)
* New database version : 2
* Add two new protections : REQUESTS_MIN_DELAY and MAX_PASSWORDS_PER_REQUEST (see conf.php)
* Remove '' character from password generation


* Addon is now compatible with more websites
* Use jpm building tool instead of cfx for Firefox Addon

v0.6 :


* Add support for "@_masterkey" input

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