add dns api

This commit is contained in:
AJ ONeal 2019-04-29 01:50:54 -06:00
parent 7385dd8580
commit 7f0a5fb28a
3 changed files with 708 additions and 0 deletions

547
package-lock.json generated Normal file
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@ -0,0 +1,547 @@
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package.json Normal file
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{
"name": "bluecrypt-keypairs",
"version": "0.1.0",
"description": "Zero-Dependency Native Browser support for ECDSA P-256 and P-384, and RSA 2048/3072/4096 written in VanillaJS",
"main": "server.js",
"directories": {
"lib": "lib"
},
"scripts": {
"test": "node server.js",
"start": "node server.js"
},
"repository": {
"type": "git",
"url": "https://git.coolaj86.com/coolaj86/bluecrypt-keypairs.js.git"
},
"keywords": [
"browser",
"EC",
"RSA",
"ECDSA",
"P-256",
"P-384",
"bluecrypt",
"keypairs",
"greenlock",
"VanillaJS"
],
"author": "AJ ONeal <coolaj86@gmail.com> (https://coolaj86.com/)",
"license": "MPL-2.0",
"devDependencies": {
"dig.js": "^1.3.9",
"dns-suite": "^1.2.12",
"express": "^4.16.4"
}
}

125
server.js Normal file
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@ -0,0 +1,125 @@
'use strict';
var crypto = require('crypto');
//var dnsjs = require('dns-suite');
var dig = require('dig.js/dns-request');
var express = require('express');
var app = express();
var nameservers = require('dns').getServers();
var index = crypto.randomBytes(2).readUInt16BE(0) % nameservers.length;
var nameserver = nameservers[index];
app.use('/', express.static('./'));
app.use('/api', express.json());
app.get('/api/dns/:domain', function (req, res, next) {
console.log(req.params);
var domain = req.params.domain;
var casedDomain = domain.toLowerCase().split('').map(function (ch) {
// dns0x20 takes advantage of the fact that the binary operation for toUpperCase is
// ch = ch | 0x20;
return Math.round(Math.random()) % 2 ? ch : ch.toUpperCase();
}).join('');
var typ = req.query.type;
var query = {
header: {
id: crypto.randomBytes(2).readUInt16BE(0)
, qr: 0
, opcode: 0
, aa: 0 // Authoritative-Only
, tc: 0 // NA
, rd: 1 // Recurse
, ra: 0 // NA
, rcode: 0 // NA
}
, question: [
{ name: casedDomain
//, type: typ || 'A'
, typeName: typ || 'A'
, className: 'IN'
}
]
};
var opts = {
onError: function (err) {
next(err);
}
, onMessage: function (packet) {
var fail0x20;
if (packet.id !== query.id) {
console.error('[SECURITY] ignoring packet for \'' + packet.question[0].name + '\' due to mismatched id');
console.error(packet);
return;
}
packet.question.forEach(function (q) {
// if (-1 === q.name.lastIndexOf(cli.casedQuery))
if (q.name !== casedDomain) {
fail0x20 = q.name;
}
});
[ 'question', 'answer', 'authority', 'additional' ].forEach(function (group) {
(packet[group]||[]).forEach(function (a) {
var an = a.name;
var i = domain.toLowerCase().lastIndexOf(a.name.toLowerCase()); // answer is something like ExAMPle.cOM and query was wWw.ExAMPle.cOM
var j = a.name.toLowerCase().lastIndexOf(domain.toLowerCase()); // answer is something like www.ExAMPle.cOM and query was ExAMPle.cOM
// it's important to note that these should only relpace changes in casing that we expected
// any abnormalities should be left intact to go "huh?" about
// TODO detect abnormalities?
if (-1 !== i) {
// "EXamPLE.cOm".replace("wWw.EXamPLE.cOm".substr(4), "www.example.com".substr(4))
a.name = a.name.replace(casedDomain.substr(i), domain.substr(i));
} else if (-1 !== j) {
// "www.example.com".replace("EXamPLE.cOm", "example.com")
a.name = a.name.substr(0, j) + a.name.substr(j).replace(casedDomain, domain);
}
// NOTE: right now this assumes that anything matching the query matches all the way to the end
// it does not handle the case of a record for example.com.uk being returned in response to a query for www.example.com correctly
// (but I don't think it should need to)
if (a.name.length !== an.length) {
console.error("[ERROR] question / answer mismatch: '" + an + "' != '" + a.length + "'");
console.error(a);
}
});
});
if (fail0x20) {
console.warn(";; Warning: DNS 0x20 security not implemented (or packet spoofed). Queried '"
+ casedDomain + "' but got response for '" + fail0x20 + "'.");
return;
}
res.send({
header: packet.header
, question: packet.question
, answer: packet.answer
, authority: packet.authority
, additional: packet.additional
, edns_options: packet.edns_options
});
}
, onListening: function () {}
, onSent: function (/*res*/) { }
, onTimeout: function (res) {
console.error('dns timeout:', res);
next(new Error("DNS timeout - no response"));
}
, onClose: function () { }
//, mdns: cli.mdns
, nameserver: nameserver
, port: 53
, timeout: 2000
};
dig.resolveJson(query, opts);
});
// curl -L http://localhost:3000/api/dns/example.com?type=A
console.log("Listening on localhost:3000");
app.listen(3000);
console.log("Try this:");
console.log("\tcurl -L 'http://localhost:3000/api/dns/example.com?type=A'");