Zerodrop 🕵️

A utility for private redirects and proxies that disappear after certain conditions are met.

Live demo

A live demo is available at this dangerous.link.

Features

• Web interface for creating resources
• Create proxies and redirections for a given URL
• Upload files or manually enter content in a textarea
• Access control
• Expire access to a resource after number of downloads
• Block or allow access based on IP address
• Block or allow access based on IP network
• Block or allow access based on GeoIP location
• Block or allow access based on hostname matching (w/ regex)
• Publish "secret" pages with UUID generation
• Self-destruct action which removes and kills running binary; configurable.

Blacklist

The blacklist syntax is similar to that of gitignore. An optional prefix ! which negates the pattern can be used for whitelisting.

Categories

1. Match All [*] (Useful for creating a whitelist)
2. Match IP [e.g. 203.0.113.6 or 2001:db8::68]
3. Match IP Network [e.g.: 192.0.2.0/24 or ::1/128]
4. Match Hostname [e.g. crawl-66-249-66-1.googlebot.com]
5. Match Hostname RegExp [e.g.: ~ .*\.cox\.net]
6. Match Geofence [e.g.: @ 39.377297 -74.451082 (7km)]
7. Match database [e.g. db datacenters or db tor]

Whitelist

For example to only allow from local:

# This strange blacklist only allows access from localhost and google bots
*
! ::1  # Allow localhost
! ~ .*\.google(bot)?\.com$

Geofencing

A @ prefix is for targeted geofencing, i.e., @ lat lng (optional radius). The default radius is 25m. For example to block Atlantic City:

@ 39.377297 -74.451082 (7km)

Unit	Symbol
meter	m
kilometer	km
mile	mi
feet	ft

Regular Expression

A ~ prefix indicates a hostname regular expression match.

shady.com
~ (.*)\.shady\.com # Block subdomains of shady

Databases

A rule that begins with "db " will be matched with a database by name, e.g., !db tor to whitelist Tor exit nodes. The database file must be specified in the config.

ipcat:
    cloudflare: cloudflare.csv
    datacenters: datacenters.csv
    tor: torexitnodes.csv

The format of the CSV file is specified by ipcat rules.