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ready-ish to release Bluecrypt ACME

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LICENSE
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Copyright 2017-present AJ ONeal
Copyright 2015-2019 AJ ONeal
Mozilla Public License Version 2.0
==================================

195
README.md
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# Bluecrypt™ Keypairs
# Bluecrypt™ [ACME.js](https://git.rootprojects.org/root/bluecrypt-acme.js) | A [Root](https://rootprojects.org/acme/) project
A port of [keypairs.js](https://git.coolaj86.com/coolaj86/keypairs.js) to the browser.
Free SSL Certificates from Let's Encrypt, right in your Web Browser
* Keypairs
* Eckles (ECDSA)
* Rasha (RSA)
* X509
* ASN1
Lightweight. Fast. Modern Crypto. Zero dependecies.
(a port of [acme.js](https://git.coolaj86.com/coolaj86/acme-v2.js) to the browser)
# Features
| 15k gzipped | 55k minified | 88k (2,500 loc) source with comments |
* [x] Let's Encrypt
* [x] ACME draft 15 (supports POST-as-GET)
* [x] Secure support for EC and RSA for account and server keys
* [x] Simple and lightweight PEM, DER, ASN1, X509, and CSR implementations
* [x] VanillaJS, Zero Dependencies
# Online Demos
* Greenlock for the Web <https://greenlock.domains>
* Bluecrypt ACME Demo <https://rootprojects.org/acme/>
We expect that our hosted versions will meet all of yours needs.
If they don't, please open an issue to let us know why.
We'd much rather improve the app than have a hundred different versions running in the wild.
However, in keeping to our values we've made the source visible for others to inspect, improve, and modify.
# QuickStart
Bluecrypt ACME embeds [Keypairs.js](https://git.rootprojects.org/root/bluecrypt-keypairs.js)
and [CSR.js](https://git.rootprojects.org/root/bluecrypt-csr.js)
`bluecrypt-acme.js`
```html
<script src="https://rootprojects.org/acme/bluecrypt-acme.js"></script>
```
`bluecrypt-acme.min.js`
```html
<script src="https://rootprojects.org/acme/bluecrypt-acme.min.js"></script>
```
You can see `index.html` and `app.js` in the repo for full example usage.
### Instantiate Bluecrypt ACME
Although built for Let's Encrypt, Bluecrypt ACME will work with any server
that supports draft-15 of the ACME spec (includes POST-as-GET support).
The `init()` method takes a _directory url_ and initializes internal state according to its response.
```js
var acme = ACME.create({});
acme.init('https://acme-staging-v02.api.letsencrypt.org/directory').then(function () {
// Ready to use, show page
$('body').hidden = false;
});
```
### Create ACME Account with Let's Encrypt
ACME Accounts are key and device based, with an email address as a backup identifier.
A public account key must be registered before an SSL certificate can be requested.
```js
var accountPrivateKey;
var account;
Keypairs.generate({ kty: 'EC' }).then(function (pair) {
accountPrivateKey = pair.private;
return acme.accounts.create({
agreeToTerms: function (tos) {
if (window.confirm("Do you agree to the Bluecrypt and Let's Encrypt Terms of Service?")) {
return Promise.resolve(tos);
}
}
, accountKeypair: { privateKeyJwk: pair.private }
, email: $('.js-email-input').value
}).then(function (_account) {
account = _account;
});
});
```
### Get Free 90-day SSL Certificate
Creating an ACME "order" for a 90-day SSL certificate requires use of the account private key,
the names of domains to be secured, and a distinctly separate server private key.
A domain ownership verification "challenge" (uploading a file to an unsecured HTTP url or setting a DNS record)
is a required part of the process, which requires `set` and `remove` callbacks/promises.
```js
var serverPrivateKey;
Keypairs.generate({ kty: 'EC' }).then(function (pair) {
serverPrivateKey = pair.private;
return acme.certificates.create({
agreeToTerms: function (tos) {
return tos;
}
, account: account
, accountKeypair: { privateKeyJwk: accountPrivateKey }
, serverKeypair: { privateKeyJwk: serverPrivateKey }
, domains: ['example.com','www.example.com']
, challenges: challenges // must be implemented
, skipDryRun: true
}).then(function (results) {
console.log('Got SSL Certificate:');
console.log(results.expires);
console.log(results.cert);
console.log(results.chain);
});
});
```
### Example "Challenge" Implementation
Typically here you're just presenting some sort of dialog to the user to ask them to
upload a file or set a DNS record.
It may be possible to do something fancy like using OAuth2 to login to Google Domanis
to set a DNS address, etc, but it seems like that sort of fanciness is probably best
reserved for server-side plugins.
```js
var challenges = {
'http-01': {
set: function (opts) {
console.info('http-01 set challenge:');
console.info(opts.challengeUrl);
console.info(opts.keyAuthorization);
while (!window.confirm("Upload the challenge file before continuing.")) {}
return Promise.resolve();
}
, remove: function (opts) {
console.log('http-01 remove challenge:', opts.challengeUrl);
return Promise.resolve();
}
}
};
```
# Full Documentation
See [acme.js](https://git.coolaj86.com/coolaj86/acme-v2.js).
Aside from the loading instructions (`npm` and `require` instead of `script` tags),
the usage is identical to the node version.
That said, the two may leap-frog a little from time to time
(for example, the browser version is just a touch ahead at the moment).
# Developing
You can see `<script>` tags in the `index.html` in the repo, which references the original
source files.
Join `@rootprojects` `#general` on [Keybase](https://keybase.io) if you'd like to chat with us.
# Commercial Support
We have both commercial support and commercial licensing available.
You're welcome to [contact us](mailto:aj@therootcompany.com) in regards to IoT, On-Prem,
Enterprise, and Internal installations, integrations, and deployments.
We also offer consulting for all-things-ACME and Let's Encrypt.
# Legal &amp; Rules of the Road
Bluecrypt&trade; and Greenlock&trade; are [trademarks](https://rootprojects.org/legal/#trademark) of AJ ONeal
The rule of thumb is "attribute, but don't confuse". For example:
> Built with [Root](https://rootprojects.org)'s [Bluecrypt ACME](https://git.rootprojects.org/root/bluecrypt-acme.js).
Please [contact us](mailto:aj@therootcompany.com) if have any questions in regards to our trademark,
attribution, and/or visible source policies. We want to help to community as we build great software.
[bluecrypt.js](https://git.coolaj86.com/coolaj86/bluecrypt.js) |
MPL-2.0 |
[Terms of Use](https://therootcompany.com/legal/#terms) |
[Privacy Policy](https://therootcompany.com/legal/#privacy)

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app.js
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return Array.prototype.slice.call(document.querySelectorAll(sel));
}
function checkTos(tos) {
if ($('input[name="tos"]:checked')) {
return tos;
} else {
return '';
}
}
function run() {
console.log('hello');
@ -111,8 +119,156 @@
});
});
$('form.js-acme-account').addEventListener('submit', function (ev) {
ev.preventDefault();
ev.stopPropagation();
$('.js-loading').hidden = false;
var acme = ACME.create({
Keypairs: Keypairs
, CSR: CSR
});
acme.init('https://acme-staging-v02.api.letsencrypt.org/directory').then(function (result) {
console.log('acme result', result);
var privJwk = JSON.parse($('.js-jwk').innerText).private;
var email = $('.js-email').value;
return acme.accounts.create({
email: email
, agreeToTerms: checkTos
, accountKeypair: { privateKeyJwk: privJwk }
}).then(function (account) {
console.log("account created result:", account);
accountStuff.account = account;
accountStuff.privateJwk = privJwk;
accountStuff.email = email;
accountStuff.acme = acme;
$('.js-create-order').hidden = false;
$('.js-toc-acme-account-response').hidden = false;
$('.js-acme-account-response').innerText = JSON.stringify(account, null, 2);
}).catch(function (err) {
console.error("A bad thing happened:");
console.error(err);
window.alert(err.message || JSON.stringify(err, null, 2));
});
});
});
$('form.js-csr').addEventListener('submit', function (ev) {
ev.preventDefault();
ev.stopPropagation();
generateCsr();
});
$('form.js-acme-order').addEventListener('submit', function (ev) {
ev.preventDefault();
ev.stopPropagation();
var account = accountStuff.account;
var privJwk = accountStuff.privateJwk;
var email = accountStuff.email;
var acme = accountStuff.acme;
var domains = ($('.js-domains').value||'example.com').split(/[, ]+/g);
return getDomainPrivkey().then(function (domainPrivJwk) {
console.log('Has CSR already?');
console.log(accountStuff.csr);
return acme.certificates.create({
accountKeypair: { privateKeyJwk: privJwk }
, account: account
, serverKeypair: { privateKeyJwk: domainPrivJwk }
, csr: accountStuff.csr
, domains: domains
, skipDryRun: $('input[name="skip-dryrun"]:checked') && true
, agreeToTerms: checkTos
, challenges: {
'dns-01': {
set: function (opts) {
console.info('dns-01 set challenge:');
console.info('TXT', opts.dnsHost);
console.info(opts.dnsAuthorization);
return new Promise(function (resolve) {
while (!window.confirm("Did you set the challenge?")) {}
resolve();
});
}
, remove: function (opts) {
console.log('dns-01 remove challenge:');
console.info('TXT', opts.dnsHost);
console.info(opts.dnsAuthorization);
return new Promise(function (resolve) {
while (!window.confirm("Did you delete the challenge?")) {}
resolve();
});
}
}
, 'http-01': {
set: function (opts) {
console.info('http-01 set challenge:');
console.info(opts.challengeUrl);
console.info(opts.keyAuthorization);
return new Promise(function (resolve) {
while (!window.confirm("Did you set the challenge?")) {}
resolve();
});
}
, remove: function (opts) {
console.log('http-01 remove challenge:');
console.info(opts.challengeUrl);
console.info(opts.keyAuthorization);
return new Promise(function (resolve) {
while (!window.confirm("Did you delete the challenge?")) {}
resolve();
});
}
}
}
, challengeTypes: [$('input[name="acme-challenge-type"]:checked').value]
}).then(function (results) {
console.log('Got Certificates:');
console.log(results);
$('.js-toc-acme-order-response').hidden = false;
$('.js-acme-order-response').innerText = JSON.stringify(results, null, 2);
}).catch(function (err) {
console.error("challenge failed:");
console.error(err);
window.alert("failed! " + err.message || JSON.stringify(err));
});
});
});
$('.js-generate').hidden = false;
}
function getDomainPrivkey() {
if (accountStuff.domainPrivateJwk) { return Promise.resolve(accountStuff.domainPrivateJwk); }
return Keypairs.generate({
kty: $('input[name="kty"]:checked').value
, namedCurve: $('input[name="ec-crv"]:checked').value
, modulusLength: $('input[name="rsa-len"]:checked').value
}).then(function (pair) {
console.log('domain keypair:', pair);
accountStuff.domainPrivateJwk = pair.private;
return pair.private;
});
}
function generateCsr() {
var domains = ($('.js-domains').value||'example.com').split(/[, ]+/g);
//var privJwk = JSON.parse($('.js-jwk').innerText).private;
return getDomainPrivkey().then(function (privJwk) {
accountStuff.domainPrivateJwk = privJwk;
return CSR({ jwk: privJwk, domains: domains }).then(function (pem) {
// Verify with https://www.sslshopper.com/csr-decoder.html
accountStuff.csr = pem;
console.log('Created CSR:');
console.log(pem);
console.log('CSR info:');
console.log(CSR._info(pem));
return pem;
});
});
}
window.addEventListener('load', run);
}());

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<button class="js-generate" hidden>Generate</button>
</form>
<h2>ACME Account</h2>
<form class="js-acme-account">
<label for="-acmeEmail">Email:</label>
<input class="js-email" type="email" id="-acmeEmail" value="john.doe@gmail.com">
<br>
<label for="-acmeTos"><input class="js-tos" name="tos" type="checkbox" id="-acmeTos" checked>
Agree to Let's Encrypt Terms of Service</label>
<br>
<button class="js-create-account" hidden>Create Account</button>
</form>
<h2>Certificate Signing Request</h2>
<form class="js-csr">
<label for="-acmeDomains">Domains:</label>
<input class="js-domains" type="text" id="-acmeDomains" value="example.com www.example.com">
<br>
<button class="js-create-csr" hidden>Create CSR</button>
</form>
<h2>ACME Certificate Order</h2>
<form class="js-acme-order">
Challenge type:
<label for="-http01"><input type="radio" id="-http01"
name="acme-challenge-type" value="http-01" checked>http-01</label>
<label for="-dns01"><input type="radio" id="-dns01"
name="acme-challenge-type" value="dns-01">dns-01</label>
<br>
<label for="-skipDryrun"><input class="js-skip-dryrun" name="skip-dryrun"
type="checkbox" id="-skipDryrun" checked> Skip dry-run challenge</label>
<br>
<button class="js-create-order" hidden>Create Order</button>
</form>
<div class="js-loading" hidden>Loading</div>
<details class="js-toc-jwk" hidden>
@ -87,13 +120,23 @@
<summary>PEM Public (base64-encoded SPKI/PKIX DER)</summary>
<pre><code class="js-input-pem-spki-public" ></code></pre>
</details>
<details class="js-toc-acme-account-response" hidden>
<summary>ACME Account Request</summary>
<pre><code class="js-acme-account-response">&nbsp;</code></pre>
</details>
<details class="js-toc-acme-order-response" hidden>
<summary>ACME Order Response</summary>
<pre><code class="js-acme-order-response">&nbsp;</code></pre>
</details>
<script src="./lib/bluecrypt-encoding.js"></script>
<script src="./lib/asn1-packer.js"></script>
<script src="./lib/x509.js"></script>
<script src="./lib/ecdsa.js"></script>
<script src="./lib/rsa.js"></script>
<script src="./lib/keypairs.js"></script>
<script src="./lib/asn1-parser.js"></script>
<script src="./lib/csr.js"></script>
<script src="./lib/acme.js"></script>
<script src="./app.js"></script>
</body>
</html>

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// Copyright 2018-present AJ ONeal. All rights reserved
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
(function (exports) {
'use strict';
/*global Promise*/
var ASN1 = exports.ASN1;
var Enc = exports.Enc;
var PEM = exports.PEM;
var X509 = exports.x509;
var Keypairs = exports.Keypairs;
// TODO find a way that the prior node-ish way of `module.exports = function () {}` isn't broken
var CSR = exports.CSR = function (opts) {
// We're using a Promise here to be compatible with the browser version
// which will probably use the webcrypto API for some of the conversions
return CSR._prepare(opts).then(function (opts) {
return CSR.create(opts).then(function (bytes) {
return CSR._encode(opts, bytes);
});
});
};
CSR._prepare = function (opts) {
return Promise.resolve().then(function () {
var Keypairs;
opts = JSON.parse(JSON.stringify(opts));
// We do a bit of extra error checking for user convenience
if (!opts) { throw new Error("You must pass options with key and domains to rsacsr"); }
if (!Array.isArray(opts.domains) || 0 === opts.domains.length) {
new Error("You must pass options.domains as a non-empty array");
}
// I need to check that 例.中国 is a valid domain name
if (!opts.domains.every(function (d) {
// allow punycode? xn--
if ('string' === typeof d /*&& /\./.test(d) && !/--/.test(d)*/) {
return true;
}
})) {
throw new Error("You must pass options.domains as strings");
}
if (opts.jwk) { return opts; }
if (opts.key && opts.key.kty) {
opts.jwk = opts.key;
return opts;
}
if (!opts.pem && !opts.key) {
throw new Error("You must pass options.key as a JSON web key");
}
Keypairs = exports.Keypairs;
if (!exports.Keypairs) {
throw new Error("Keypairs.js is an optional dependency for PEM-to-JWK.\n"
+ "Install it if you'd like to use it:\n"
+ "\tnpm install --save rasha\n"
+ "Otherwise supply a jwk as the private key."
);
}
return Keypairs.import({ pem: opts.pem || opts.key }).then(function (pair) {
opts.jwk = pair.private;
return opts;
});
});
};
CSR._encode = function (opts, bytes) {
if ('der' === (opts.encoding||'').toLowerCase()) {
return bytes;
}
return PEM.packBlock({
type: "CERTIFICATE REQUEST"
, bytes: bytes /* { jwk: jwk, domains: opts.domains } */
});
};
CSR.create = function createCsr(opts) {
var hex = CSR.request(opts.jwk, opts.domains);
return CSR._sign(opts.jwk, hex).then(function (csr) {
return Enc.hexToBuf(csr);
});
};
//
// EC / RSA
//
CSR.request = function createCsrBodyEc(jwk, domains) {
var asn1pub;
if (/^EC/i.test(jwk.kty)) {
asn1pub = X509.packCsrEcPublicKey(jwk);
} else {
asn1pub = X509.packCsrRsaPublicKey(jwk);
}
return X509.packCsr(asn1pub, domains);
};
CSR._sign = function csrEcSig(jwk, request) {
// Took some tips from https://gist.github.com/codermapuche/da4f96cdb6d5ff53b7ebc156ec46a10a
// TODO will have to convert web ECDSA signatures to PEM ECDSA signatures (but RSA should be the same)
// TODO have a consistent non-private way to sign
return Keypairs._sign({ jwk: jwk, format: 'x509' }, Enc.hexToBuf(request)).then(function (sig) {
return CSR._toDer({ request: request, signature: sig, kty: jwk.kty });
});
};
CSR._toDer = function encode(opts) {
var sty;
if (/^EC/i.test(opts.kty)) {
// 1.2.840.10045.4.3.2 ecdsaWithSHA256 (ANSI X9.62 ECDSA algorithm with SHA256)
sty = ASN1('30', ASN1('06', '2a8648ce3d040302'));
} else {
// 1.2.840.113549.1.1.11 sha256WithRSAEncryption (PKCS #1)
sty = ASN1('30', ASN1('06', '2a864886f70d01010b'), ASN1('05'));
}
return ASN1('30'
// The Full CSR Request Body
, opts.request
// The Signature Type
, sty
// The Signature
, ASN1.BitStr(Enc.bufToHex(opts.signature))
);
};
X509.packCsr = function (asn1pubkey, domains) {
return ASN1('30'
// Version (0)
, ASN1.UInt('00')
// 2.5.4.3 commonName (X.520 DN component)
, ASN1('30', ASN1('31', ASN1('30', ASN1('06', '550403'), ASN1('0c', Enc.utf8ToHex(domains[0])))))
// Public Key (RSA or EC)
, asn1pubkey
// Request Body
, ASN1('a0'
, ASN1('30'
// 1.2.840.113549.1.9.14 extensionRequest (PKCS #9 via CRMF)
, ASN1('06', '2a864886f70d01090e')
, ASN1('31'
, ASN1('30'
, ASN1('30'
// 2.5.29.17 subjectAltName (X.509 extension)
, ASN1('06', '551d11')
, ASN1('04'
, ASN1('30', domains.map(function (d) {
return ASN1('82', Enc.utf8ToHex(d));
}).join(''))))))))
);
};
// TODO finish this later
// we want to parse the domains, the public key, and verify the signature
CSR._info = function (der) {
// standard base64 PEM
if ('string' === typeof der && '-' === der[0]) {
der = PEM.parseBlock(der).bytes;
}
// jose urlBase64 not-PEM
if ('string' === typeof der) {
der = Enc.base64ToBuf(der);
}
// not supporting binary-encoded bas64
var c = ASN1.parse(der);
var kty;
// A cert has 3 parts: cert, signature meta, signature
if (c.children.length !== 3) {
throw new Error("doesn't look like a certificate request: expected 3 parts of header");
}
var sig = c.children[2];
if (sig.children.length) {
// ASN1/X509 EC
sig = sig.children[0];
sig = ASN1('30', ASN1.UInt(Enc.bufToHex(sig.children[0].value)), ASN1.UInt(Enc.bufToHex(sig.children[1].value)));
sig = Enc.hexToBuf(sig);
kty = 'EC';
} else {
// Raw RSA Sig
sig = sig.value;
kty = 'RSA';
}
//c.children[1]; // signature type
var req = c.children[0];
// TODO utf8
if (4 !== req.children.length) {
throw new Error("doesn't look like a certificate request: expected 4 parts to request");
}
// 0 null
// 1 commonName / subject
var sub = Enc.bufToBin(req.children[1].children[0].children[0].children[1].value);
// 3 public key (type, key)
//console.log('oid', Enc.bufToHex(req.children[2].children[0].children[0].value));
var pub;
// TODO reuse ASN1 parser for these?
if ('EC' === kty) {
// throw away compression byte
pub = req.children[2].children[1].value.slice(1);
pub = { kty: kty, x: pub.slice(0, 32), y: pub.slice(32) };
while (0 === pub.x[0]) { pub.x = pub.x.slice(1); }
while (0 === pub.y[0]) { pub.y = pub.y.slice(1); }
if ((pub.x.length || pub.x.byteLength) > 48) {
pub.crv = 'P-521';
} else if ((pub.x.length || pub.x.byteLength) > 32) {
pub.crv = 'P-384';
} else {
pub.crv = 'P-256';
}
pub.x = Enc.bufToUrlBase64(pub.x);
pub.y = Enc.bufToUrlBase64(pub.y);
} else {
pub = req.children[2].children[1].children[0];
pub = { kty: kty, n: pub.children[0].value, e: pub.children[1].value };
while (0 === pub.n[0]) { pub.n = pub.n.slice(1); }
while (0 === pub.e[0]) { pub.e = pub.e.slice(1); }
pub.n = Enc.bufToUrlBase64(pub.n);
pub.e = Enc.bufToUrlBase64(pub.e);
}
// 4 extensions
var domains = req.children[3].children.filter(function (seq) {
// 1.2.840.113549.1.9.14 extensionRequest (PKCS #9 via CRMF)
if ('2a864886f70d01090e' === Enc.bufToHex(seq.children[0].value)) {
return true;
}
}).map(function (seq) {
return seq.children[1].children[0].children.filter(function (seq2) {
// subjectAltName (X.509 extension)
if ('551d11' === Enc.bufToHex(seq2.children[0].value)) {
return true;
}
}).map(function (seq2) {
return seq2.children[1].children[0].children.map(function (name) {
// TODO utf8
return Enc.bufToBin(name.value);
});
})[0];
})[0];
return {
subject: sub
, altnames: domains
, jwk: pub
, signature: sig
};
};
X509.packCsrRsaPublicKey = function (jwk) {
// Sequence the key
var n = ASN1.UInt(Enc.base64ToHex(jwk.n));
var e = ASN1.UInt(Enc.base64ToHex(jwk.e));
var asn1pub = ASN1('30', n, e);
// Add the CSR pub key header
return ASN1('30', ASN1('30', ASN1('06', '2a864886f70d010101'), ASN1('05')), ASN1.BitStr(asn1pub));
};
X509.packCsrEcPublicKey = function (jwk) {
var ecOid = X509._oids[jwk.crv];
if (!ecOid) {
throw new Error("Unsupported namedCurve '" + jwk.crv + "'. Supported types are " + Object.keys(X509._oids));
}
var cmp = '04'; // 04 == x+y, 02 == x-only
var hxy = '';
// Placeholder. I'm not even sure if compression should be supported.
if (!jwk.y) { cmp = '02'; }
hxy += Enc.base64ToHex(jwk.x);
if (jwk.y) { hxy += Enc.base64ToHex(jwk.y); }
// 1.2.840.10045.2.1 ecPublicKey
return ASN1('30', ASN1('30', ASN1('06', '2a8648ce3d0201'), ASN1('06', ecOid)), ASN1.BitStr(cmp + hxy));
};
X509._oids = {
// 1.2.840.10045.3.1.7 prime256v1
// (ANSI X9.62 named elliptic curve) (06 08 - 2A 86 48 CE 3D 03 01 07)
'P-256': '2a8648ce3d030107'
// 1.3.132.0.34 P-384 (06 05 - 2B 81 04 00 22)
// (SEC 2 recommended EC domain secp256r1)
, 'P-384': '2b81040022'
// requires more logic and isn't a recommended standard
// 1.3.132.0.35 P-521 (06 05 - 2B 81 04 00 23)
// (SEC 2 alternate P-521)
//, 'P-521': '2B 81 04 00 23'
};
// don't replace the full parseBlock, if it exists
PEM.parseBlock = PEM.parseBlock || function (str) {
var der = str.split(/\n/).filter(function (line) {
return !/-----/.test(line);
}).join('');
return { bytes: Enc.base64ToBuf(der) };
};
}('undefined' === typeof window ? module.exports : window));

553
package-lock.json generated Normal file
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@ -0,0 +1,553 @@
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7
package.json
View File

@ -1,7 +1,8 @@
{
"name": "bluecrypt-keypairs",
"version": "0.1.1",
"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"
},
@ -28,5 +29,9 @@
"author": "AJ ONeal <coolaj86@gmail.com> (https://coolaj86.com/)",
"license": "MPL-2.0",
"devDependencies": {
"@root/request": "^1.3.10",
"dig.js": "^1.3.9",
"dns-suite": "^1.2.12",
"express": "^4.16.4"
}
}

139
server.js Normal file
View File

@ -0,0 +1,139 @@
'use strict';
var crypto = require('crypto');
//var dnsjs = require('dns-suite');
var dig = require('dig.js/dns-request');
var request = require('util').promisify(require('@root/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(__dirname));
app.use('/api', express.json());
app.get('/api/dns/:domain', function (req, res, next) {
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);
});
app.get('/api/http', function (req, res) {
var url = req.query.url;
return request({ method: 'GET', url: url }).then(function (resp) {
res.send(resp.body);
});
});
app.get('/api/_acme_api_', function (req, res) {
res.send({ success: true });
});
module.exports = app;
if (require.main === module) {
// curl -L http://localhost:3000/api/dns/example.com?type=A
console.info("Listening on localhost:3000");
app.listen(3000);
console.info("Try this:");
console.info("\tcurl -L 'http://localhost:3000/api/_acme_api_/'");
console.info("\tcurl -L 'http://localhost:3000/api/dns/example.com?type=A'");
console.info("\tcurl -L 'http://localhost:3000/api/http/?url=https://example.com'");
}