LAN port scan forbidder Chrome web store extension
Run the Chrome online web store extension LAN port scan forbidder using OffiDocs Chromium online.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) (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.
- Offered by Garywill
- Average rating : 0 stars (hated it)
LAN port scan forbidder web extension integrated with the OffiDocs Chromium online