LAN port scan forbidder in Chrome with OffiDocs

DESCRIPTION

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.

### 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.

Additional Information:

- Offered by garywill.github.io
- Average rating : 0 stars (hated it)
- Developer This email address is being protected from spambots. You need JavaScript enabled to view it.

LAN port scan forbidder web extension integrated with the OffiDocs Chromium online