Apa itu LAN port scan forbidder?

LAN port scan forbidder adalah ekstensi Chrome yang dikembangkan oleh https://garywill.github.io, dan fitur utamanya adalah "Forbid non-LAN web to access LAN".

Screenshot Ekstensi

Unduh Berkas CRX Ekstensi LAN port scan forbidder

Unduh file ekstensi LAN port scan forbidder dalam format crx, pasang ekstensi Chrome secara manual di peramban, atau bagikan file crx dengan teman untuk menginstal ekstensi Chrome dengan mudah.

Petunjuk Penggunaan Ekstensi

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!

Informasi Dasar Ekstensi

Nama	LAN port scan forbidder
ID	lapppchpconamefemlnjdebbcpbncafl
URL Resmi	https://chromewebstore.google.com/detail/lan-port-scan-forbidder/lapppchpconamefemlnjdebbcpbncafl
Deskripsi	Forbid non-LAN web to access LAN
Ukuran File	35.41 KB
Jumlah Instalasi	310
Versi Saat Ini	0.6.1
Terakhir Diperbarui	2023-11-09
Tanggal Publikasi	2021-12-25
Pengembang	https://garywill.github.io
Email	[email protected]
Tipe Pembayaran	free
Situs Ekstensi	https://github.com/garywill/LAN-port-scan-forbidder
URL Halaman Bantuan	https://github.com/garywill/LAN-port-scan-forbidder
URL Halaman Kebijakan Privasi	https://github.com/garywill/garywill/blob/privacy_policy/README.md
Bahasa yang Didukung	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" } }