paranoid-request

An SSRF-preventing wrapper around Node's request module, as well as the lower-level http and https modules.

Overview

Server Side Request Forgery (SSRF) is a vulnerability that appears when an attacker has the ability to create requests from a vulnerable server.

This can allow the attacker to make requests to localhost, thereby exposing sensitive internal services that are behind the firewall.

This library prevents this category of attacks by preventing the requests from firing.

For more info on SSRF vulnerabilities, check out this article.

Usage

Exactly the same as https://www.npmjs.com/package/request, with the addition that we will emit an 'error' event with an UnacceptableAddressError when we can't find a suitable address.

var paranoid = require("paranoid-request");
 
// These two will be blocked
paranoid.get("http://localhost/", function(err, res, body) {
    console.log(err && err.message);
    // All addresses were blacklisted!
});
 
paranoid.get("http://example.com:9000/", function(err, res, body) {
    console.log(err && err.message);
    // Disallowed port detected
});
 
// but this is fine
paranoid.get("http://example.com/", function(err, res, body) {
    console.log(res.statusCode);
    // 200
});

If you want a custom set of validation rules, you can also roll your own version of paranoid-request:

var paranoid = require("paranoid-request");
 
// example.com's IP
var exampleComIp = "93.184.216.34";
var exampleComCIDR = exampleComIp + "/32";
var exampleComIpURL = "http://" + exampleComIp + "/";
 
// Make a wrapper that blocks example.com's IP by default
var moreParanoid = paranoid.defaults({
  addrValidator: new paranoid.AddrValidator({ipBlacklist: [exampleComCIDR]})
});
 
// Now requests to example.com's IP should be blocked
moreParanoid.get(exampleComIpURL, function(err, res, body) {
  console.log(err && err.message);
  // All addresses were blacklisted!
});

You can also use paranoid-request's paranoid wrappers for the stdlib's http and https as well via require("paranoid-request").httpModule and require("paranoid-request").httpsModule, respectively. However, I don't recommend it.

Testing

• npm install
• npm test

Installation

npm install paranoid-request

Development

Develop like any other node module. Please write tests for any new code you add!