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--- /dev/null +++ b/package.json @@ -0,0 +1,36 @@ +{ + "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 (https://coolaj86.com/)", + "license": "MPL-2.0", + "devDependencies": { + "dig.js": "^1.3.9", + "dns-suite": "^1.2.12", + "express": "^4.16.4" + } +} diff --git a/server.js b/server.js new file mode 100644 index 0000000..34938da --- /dev/null +++ b/server.js @@ -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'");