Qu'est-ce que LAN port scan forbidder ?

LAN port scan forbidder est une extension Chrome développée par https://garywill.github.io, et sa fonction principale est "Forbid non-LAN web to access LAN".

Captures d'Écran de l'Extension

Télécharger le fichier CRX de l'extension LAN port scan forbidder

Téléchargez les fichiers d'extension LAN port scan forbidder au format crx, installez manuellement les extensions Chrome dans le navigateur ou partagez les fichiers crx avec des amis pour installer facilement les extensions Chrome.

Instructions d'Utilisation de l'Extension

Forbid untrusted web to scan localhost or LAN.

## Source Code Repo
https://github.com/garywill/LAN-port-scan-forbidder

## What

Webs can try to fetch `127.0.0.1:xxxx` or `192.168.Y.Z:xxxx` to scan your open ports in LAN.

Although browsers have cross-domain protections, webs can't read response contents, **but** can still see the connection succeeds or fails.

There're already reports that some websites using that as tracking fingerprint.

> A web for testing: http://samy.pl/webscan/

## So

Forbid any website behaviors trying to connect to your LAN or localhost, if user is visiting the website via their domains or public IP addresses. (Read the source code `background.js` to see the logic)

> Using JS library [whitequark/ipaddr.js](https://github.com/whitequark/ipaddr.js) (MIT License) v2.0.0 to judge IP range.

### Notification

User can enable notification. When untrusted web tries to access private network and get blocked, will show up notification.

### Fallback operation

If user find a web broken, user can temporary set this addon disabled via toolbar button for:

- this one tab
- this one tab and new tabs opened by this tab
- this one window (Firefox only)
- globally

(above can be set as keyboard shortcuts)

there's showy toolbar button badge indicating disabling status.

## Cases when web LAN scan is properly used

Not all LAN-port-scan are evil.

- Some manufacturers provide web for user's browser to scan LAN for their product that need updating.

- Some softwares use `127.0.0.1` communication to interact between native program and web.

## Disclaimer

This open souce addon comes with no warranty. Use on you own risk!

Informations de Base sur l'Extension

Nom	LAN port scan forbidder
ID	lapppchpconamefemlnjdebbcpbncafl
URL Officiel	https://chromewebstore.google.com/detail/lan-port-scan-forbidder/lapppchpconamefemlnjdebbcpbncafl
Description	Forbid non-LAN web to access LAN
Taille du Fichier	35.41 KB
Nombre d'Installations	310
Version Actuelle	0.6.1
Dernière Mise à Jour	2023-11-09
Date de Publication	2021-12-25
Développeur	https://garywill.github.io
Email	[email protected]
Type de Paiement	free
Site Web de l'Extension	https://github.com/garywill/LAN-port-scan-forbidder
URL de la Page d'Aide	https://github.com/garywill/LAN-port-scan-forbidder
URL de la Page de Politique de Confidentialité	https://github.com/garywill/garywill/blob/privacy_policy/README.md
Langues Prises en Charge	en
manifest.json
{ "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx", "name": "LAN port scan forbidder", "description": "Forbid non-LAN web to access LAN", "manifest_version": 2, "version": "0.6.1", "homepage_url": "https:\/\/github.com\/garywill\/LAN-port-scan-forbidder\/", "author": { "name": "Garywill", "url": "https:\/\/garywill.github.io" }, "permissions": [ "webRequest", "webRequestBlocking", ":\/\/\/", "ws:\/\/\/", "wss:\/\/\/", "ftp:\/\/\/*", "contextMenus", "storage" ], "optional_permissions": [ "notifications" ], "icons": { "128": "icon.png" }, "background": { "page": "background.html" }, "browser_action": { "default_icon": "icon_gray.png", "default_title": "LAN port scan forbidder" }, "commands": { "_execute_browser_action": { "description": "Click toolbar button" }, "toggle_t": { "description": "Toggle for one tab" }, "toggle_h": { "description": "Toggle for one tab and new tabs opened by it" }, "toggle_global": { "description": "Toggle globally enable\/disable" } }, "options_ui": { "page": "options.html" } }