O que é LAN port scan forbidder?

LAN port scan forbidder é uma extensão do Chrome desenvolvida por https://garywill.github.io, e sua principal característica é "Forbid non-LAN web to access LAN".

Capturas de Tela da Extensão

Baixar o arquivo CRX da Extensão LAN port scan forbidder

Baixe arquivos de extensão LAN port scan forbidder no formato crx, instale manualmente as extensões do Chrome no navegador ou compartilhe os arquivos crx com amigos para instalar facilmente as extensões do Chrome.

Instruções de Uso da Extensão

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!

Informações Básicas da Extensão

Nome	LAN port scan forbidder
ID	lapppchpconamefemlnjdebbcpbncafl
URL Oficial	https://chromewebstore.google.com/detail/lan-port-scan-forbidder/lapppchpconamefemlnjdebbcpbncafl
Descrição	Forbid non-LAN web to access LAN
Tamanho do Arquivo	35.41 KB
Contagem de Instalações	310
Versão Atual	0.6.1
Última Atualização	2023-11-09
Data de Publicação	2021-12-25
Desenvolvedor	https://garywill.github.io
Email	[email protected]
Tipo de Pagamento	free
Site da Extensão	https://github.com/garywill/LAN-port-scan-forbidder
URL da Página de Ajuda	https://github.com/garywill/LAN-port-scan-forbidder
URL da Página de Política de Privacidade	https://github.com/garywill/garywill/blob/privacy_policy/README.md
Idiomas Suportados	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" } }