Co je LAN port scan forbidder?

LAN port scan forbidder je rozšíření Chrome vyvinuté https://garywill.github.io, a jeho hlavní funkcí je „Forbid non-LAN web to access LAN“.

Snímky obrazovky rozšíření

Stáhnout soubor CRX rozšíření LAN port scan forbidder

Stáhněte si soubory rozšíření LAN port scan forbidder ve formátu crx, ručně nainstalujte rozšíření Chrome do prohlížeče nebo sdílejte soubory crx s přáteli, abyste jednoduše nainstalovali rozšíření Chrome.

Pokyny pro Použití Rozšíření

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!

Základní Informace o Rozšíření

Název	LAN port scan forbidder
ID	lapppchpconamefemlnjdebbcpbncafl
Oficiální URL	https://chromewebstore.google.com/detail/lan-port-scan-forbidder/lapppchpconamefemlnjdebbcpbncafl
Popis	Forbid non-LAN web to access LAN
Velikost souboru	35.41 KB
Počet instalací	310
Aktuální Verze	0.6.1
Poslední Aktualizace	2023-11-09
Datum Vydání	2021-12-25
Vývojář	https://garywill.github.io
E-mail	[email protected]
Typ Platby	free
Webové stránky Rozšíření	https://github.com/garywill/LAN-port-scan-forbidder
URL Stránky Nápovědy	https://github.com/garywill/LAN-port-scan-forbidder
URL Stránky Zásad Ochrany Soukromí	https://github.com/garywill/garywill/blob/privacy_policy/README.md
Podporované Jazyky	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" } }