// 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/. */ 'use strict'; /*global Promise*/ var ASN1 = require('./asn1/packer.js'); // DER, actually var Asn1 = ASN1.Any; var BitStr = ASN1.BitStr; var UInt = ASN1.UInt; var Asn1Parser = require('./asn1/parser.js'); var Enc = require('omnibuffer'); var PEM = require('./pem.js'); var X509 = require('./x509.js'); var Keypairs = require('./keypairs'); // TODO find a way that the prior node-ish way of `module.exports = function () {}` isn't broken var CSR = module.exports; CSR.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() { 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'); } 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 BitStr(Enc.bufToHex(opts.signature)) ); }; X509.packCsr = function(asn1pubkey, domains) { return Asn1( '30', // Version (0) 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 = Asn1Parser.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', UInt(Enc.bufToHex(sig.children[0].value)), 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 }; };