321 lines
7.6 KiB
JavaScript
321 lines
7.6 KiB
JavaScript
// Copyright 2018-present AJ ONeal. All rights reserved
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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'use strict';
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/*global Promise*/
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var ASN1 = require('./asn1/packer.js'); // DER, actually
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var Asn1 = ASN1.Any;
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var BitStr = ASN1.BitStr;
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var UInt = ASN1.UInt;
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var Asn1Parser = require('./asn1/parser.js');
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var Enc = require('omnibuffer');
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var PEM = require('./pem.js');
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var X509 = require('./x509.js');
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var Keypairs = require('./keypairs');
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// TODO find a way that the prior node-ish way of `module.exports = function () {}` isn't broken
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var CSR = module.exports;
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CSR.csr = function(opts) {
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// We're using a Promise here to be compatible with the browser version
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// which will probably use the webcrypto API for some of the conversions
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return CSR._prepare(opts).then(function(opts) {
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return CSR.create(opts).then(function(bytes) {
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return CSR._encode(opts, bytes);
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});
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});
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};
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CSR._prepare = function(opts) {
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return Promise.resolve().then(function() {
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opts = JSON.parse(JSON.stringify(opts));
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// We do a bit of extra error checking for user convenience
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if (!opts) {
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throw new Error(
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'You must pass options with key and domains to rsacsr'
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);
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}
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if (!Array.isArray(opts.domains) || 0 === opts.domains.length) {
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new Error('You must pass options.domains as a non-empty array');
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}
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// I need to check that 例.中国 is a valid domain name
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if (
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!opts.domains.every(function(d) {
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// allow punycode? xn--
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if (
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'string' === typeof d /*&& /\./.test(d) && !/--/.test(d)*/
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) {
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return true;
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}
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})
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) {
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throw new Error('You must pass options.domains as strings');
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}
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if (opts.jwk) {
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return opts;
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}
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if (opts.key && opts.key.kty) {
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opts.jwk = opts.key;
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return opts;
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}
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if (!opts.pem && !opts.key) {
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throw new Error('You must pass options.key as a JSON web key');
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}
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return Keypairs.import({ pem: opts.pem || opts.key }).then(function(
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pair
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) {
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opts.jwk = pair.private;
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return opts;
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});
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});
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};
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CSR._encode = function(opts, bytes) {
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if ('der' === (opts.encoding || '').toLowerCase()) {
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return bytes;
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}
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return PEM.packBlock({
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type: 'CERTIFICATE REQUEST',
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bytes: bytes /* { jwk: jwk, domains: opts.domains } */
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});
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};
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CSR.create = function createCsr(opts) {
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var hex = CSR.request(opts.jwk, opts.domains);
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return CSR._sign(opts.jwk, hex).then(function(csr) {
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return Enc.hexToBuf(csr);
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});
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};
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//
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// EC / RSA
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//
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CSR.request = function createCsrBodyEc(jwk, domains) {
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var asn1pub;
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if (/^EC/i.test(jwk.kty)) {
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asn1pub = X509.packCsrEcPublicKey(jwk);
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} else {
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asn1pub = X509.packCsrRsaPublicKey(jwk);
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}
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return X509.packCsr(asn1pub, domains);
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};
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CSR._sign = function csrEcSig(jwk, request) {
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// Took some tips from https://gist.github.com/codermapuche/da4f96cdb6d5ff53b7ebc156ec46a10a
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// TODO will have to convert web ECDSA signatures to PEM ECDSA signatures (but RSA should be the same)
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// TODO have a consistent non-private way to sign
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return Keypairs.sign(
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{ jwk: jwk, format: 'x509' },
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Enc.hexToBuf(request)
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).then(function(sig) {
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return CSR._toDer({
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request: request,
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signature: sig,
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kty: jwk.kty
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});
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});
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};
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CSR._toDer = function encode(opts) {
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var sty;
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if (/^EC/i.test(opts.kty)) {
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// 1.2.840.10045.4.3.2 ecdsaWithSHA256 (ANSI X9.62 ECDSA algorithm with SHA256)
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sty = Asn1('30', Asn1('06', '2a8648ce3d040302'));
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} else {
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// 1.2.840.113549.1.1.11 sha256WithRSAEncryption (PKCS #1)
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sty = Asn1('30', Asn1('06', '2a864886f70d01010b'), Asn1('05'));
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}
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return Asn1(
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'30',
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// The Full CSR Request Body
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opts.request,
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// The Signature Type
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sty,
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// The Signature
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BitStr(Enc.bufToHex(opts.signature))
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);
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};
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X509.packCsr = function(asn1pubkey, domains) {
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return Asn1(
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'30',
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// Version (0)
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UInt('00'),
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// 2.5.4.3 commonName (X.520 DN component)
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Asn1(
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'30',
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Asn1(
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'31',
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Asn1(
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'30',
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Asn1('06', '550403'),
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Asn1('0c', Enc.utf8ToHex(domains[0]))
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)
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)
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),
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// Public Key (RSA or EC)
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asn1pubkey,
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// Request Body
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Asn1(
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'a0',
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Asn1(
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'30',
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// 1.2.840.113549.1.9.14 extensionRequest (PKCS #9 via CRMF)
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Asn1('06', '2a864886f70d01090e'),
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Asn1(
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'31',
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Asn1(
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'30',
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Asn1(
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'30',
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// 2.5.29.17 subjectAltName (X.509 extension)
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Asn1('06', '551d11'),
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Asn1(
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'04',
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Asn1(
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'30',
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domains
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.map(function(d) {
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return Asn1('82', Enc.utf8ToHex(d));
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})
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.join('')
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)
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)
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)
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)
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)
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)
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)
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);
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};
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// TODO finish this later
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// we want to parse the domains, the public key, and verify the signature
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CSR._info = function(der) {
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// standard base64 PEM
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if ('string' === typeof der && '-' === der[0]) {
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der = PEM.parseBlock(der).bytes;
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}
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// jose urlBase64 not-PEM
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if ('string' === typeof der) {
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der = Enc.base64ToBuf(der);
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}
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// not supporting binary-encoded bas64
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var c = Asn1Parser.parse(der);
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var kty;
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// A cert has 3 parts: cert, signature meta, signature
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if (c.children.length !== 3) {
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throw new Error(
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"doesn't look like a certificate request: expected 3 parts of header"
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);
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}
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var sig = c.children[2];
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if (sig.children.length) {
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// ASN1/X509 EC
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sig = sig.children[0];
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sig = Asn1(
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'30',
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UInt(Enc.bufToHex(sig.children[0].value)),
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UInt(Enc.bufToHex(sig.children[1].value))
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);
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sig = Enc.hexToBuf(sig);
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kty = 'EC';
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} else {
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// Raw RSA Sig
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sig = sig.value;
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kty = 'RSA';
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}
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//c.children[1]; // signature type
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var req = c.children[0];
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// TODO utf8
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if (4 !== req.children.length) {
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throw new Error(
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"doesn't look like a certificate request: expected 4 parts to request"
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);
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}
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// 0 null
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// 1 commonName / subject
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var sub = Enc.bufToBin(
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req.children[1].children[0].children[0].children[1].value
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);
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// 3 public key (type, key)
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//console.log('oid', Enc.bufToHex(req.children[2].children[0].children[0].value));
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var pub;
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// TODO reuse ASN1 parser for these?
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if ('EC' === kty) {
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// throw away compression byte
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pub = req.children[2].children[1].value.slice(1);
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pub = { kty: kty, x: pub.slice(0, 32), y: pub.slice(32) };
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while (0 === pub.x[0]) {
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pub.x = pub.x.slice(1);
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}
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while (0 === pub.y[0]) {
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pub.y = pub.y.slice(1);
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}
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if ((pub.x.length || pub.x.byteLength) > 48) {
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pub.crv = 'P-521';
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} else if ((pub.x.length || pub.x.byteLength) > 32) {
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pub.crv = 'P-384';
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} else {
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pub.crv = 'P-256';
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}
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pub.x = Enc.bufToUrlBase64(pub.x);
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pub.y = Enc.bufToUrlBase64(pub.y);
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} else {
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pub = req.children[2].children[1].children[0];
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pub = {
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kty: kty,
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n: pub.children[0].value,
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e: pub.children[1].value
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};
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while (0 === pub.n[0]) {
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pub.n = pub.n.slice(1);
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}
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while (0 === pub.e[0]) {
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pub.e = pub.e.slice(1);
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}
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pub.n = Enc.bufToUrlBase64(pub.n);
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pub.e = Enc.bufToUrlBase64(pub.e);
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}
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// 4 extensions
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var domains = req.children[3].children
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.filter(function(seq) {
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// 1.2.840.113549.1.9.14 extensionRequest (PKCS #9 via CRMF)
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if ('2a864886f70d01090e' === Enc.bufToHex(seq.children[0].value)) {
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return true;
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}
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})
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.map(function(seq) {
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return seq.children[1].children[0].children
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.filter(function(seq2) {
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// subjectAltName (X.509 extension)
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if ('551d11' === Enc.bufToHex(seq2.children[0].value)) {
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return true;
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}
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})
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.map(function(seq2) {
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return seq2.children[1].children[0].children.map(function(
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name
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) {
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// TODO utf8
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return Enc.bufToBin(name.value);
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});
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})[0];
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})[0];
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return {
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subject: sub,
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altnames: domains,
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jwk: pub,
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signature: sig
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};
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};
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