acme.js/lib/csr.js

299 lines
9.4 KiB
JavaScript

// 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));