cloudflare-origin-ip

Try to find the origin IP of a webapp protected by Cloudflare.

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Description

This Python tool compares the HTTP response of the given subdomain to HTTP responses of a list of IPs addresses. This list is based on:

• subdomains supplied by the user
• subdomains found on external sources
• IPs found external sources

Then, a score of similarity is calculated for each response using the Levenshtein algorithm.

Install

git clone https://github.com/gwen001/cloudflare-origin-ip
cd cloudflare-origin-ip
pip3 install -r requirements.txt

Depending the sources you want to use, you'll need to create environment variables:

• Censys: CENSYS_UID and CENSYS_SECRET
• SecurityTrails: SECURITY_TRAILS_API_KEY

Usage

$ python3 cloudflare-origin-ip.py <url>

usage: cloudflare-origin-ip.py [-h] [-u URL] [-s SOURCE]

options:
  -h, --help            show this help message and exit
  -u URL, --url URL     url to test
  -s SOURCE, --source SOURCE
                        datas sources separated by coma, can be: censys,crtsh,securitytrails,local file

Examples:
cloudflare-origin-ip.py -u https://xxx.xxxxxxxxxxxx.xxx
cloudflare-origin-ip.py -u https://xxx.xxxxxxxxxxxx.xxx -s censys,crtsh,securitytrails (default)
cloudflare-origin-ip.py -u https://xxx.xxxxxxxxxxxx.xxx -s /home/local/ips.txt
cloudflare-origin-ip.py -u https://xxx.xxxxxxxxxxxx.xxx -s censys,crtsh,/home/local/ips.txt,/home/local/subdomains.txt

How it works

1/ Performs a HTTP request to the URL provided, this is the reference request.

2/ Grabs IPs using several sources:

• censys (key required)
• crtsh
• securitytrails (key required)
• local file

3/ Performs a HTTP request to all IPs grabbed with the header Host setted to the subdomain of the reference request.

4/ Compares the responses obtained with the response of the reference request using the Levenshtein algorithm.

5/ Displays a score of similarity.

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Feel free to open an issue if you have any problem with the script.