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diosts

The disclose.io security.txt scraper (diosts) takes a list of domains as the input, retrieves and validates the security.txt if available and outputs it in the disclose.io JSON format.

Installation

Prerequisites: a working Golang installation >= 1.13

go get github.com/disclose/diosts/cmd/diosts

Usage

cat domains.txt | ~/go/bin/diosts -t <threads> 2>diosts.log >securitytxt.json

This wil try and scrape the security.txt from the domains listed in domains.txt, with <threads> parallel threads (defaults to 8). Logging (with information on each of the domains in the input) will be written to diosts.log (because it's output to stderr) and a JSON array of retrieved security.txt information in disclose.io format will be written to securitytxt.json.

For each input, the following URIs are tried, in order:

  1. https://<domain>/.well-known/security.txt
  2. https://<domain>/security.txt
  3. http://<domain>/.well-known/security.txt
  4. http://<domain>/security.txt

Any non-fatal violations of the security.txt specification will be logged.

Build

Note: building is not necessary if you use the installation instructions, Go will take care of this for you.

git clone https://github.com/disclose/diosts
cd diosts
go build ./cmd/diosts

Notes

Redirects

According to the specifications, a redirect should be followed when retrieving security.txt. However:

When retrieving the file and any resources referenced in the file, researchers should record any redirects since they can lead to a different domain or IP address controlled by an attacker. Further inspections of such redirects is recommended before using the information contained within the file.

At this point, we blindly accept redirects within the same organization (e.g., google.com to www.google.com is accepted). Any other redirect is logged as an error, to be dealt with later.

Canonical

A security.txt should contain a Canonical field with a URL pointing to the canonical version of the security.txt. We should check if we retrieved the security.txt from the canonical URL and if not, do so.

Program name

Currently, we use the input domain name as program name. This might or might not be correct, especially with redirects and canonical URL entries. To be discussed later.

About

A Go scraper that validates security.txt files and outputs them in the disclose.io JSON format.

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