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acme.js
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// Copyright 2018 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';
/* globals Promise */
var ACME = module.exports.ACME = {};
ACME.formatPemChain = function formatPemChain(str) {
return str.trim().replace(/[\r\n]+/g, '\n').replace(/\-\n\-/g, '-\n\n-') + '\n';
};
ACME.splitPemChain = function splitPemChain(str) {
return str.trim().split(/[\r\n]{2,}/g).map(function (str) {
return str + '\n';
});
};
// http-01: GET https://example.org/.well-known/acme-challenge/{{token}} => {{keyAuth}}
// dns-01: TXT _acme-challenge.example.org. => "{{urlSafeBase64(sha256(keyAuth))}}"
ACME.challengePrefixes = {
'http-01': '/.well-known/acme-challenge'
, 'dns-01': '_acme-challenge'
};
ACME.challengeTests = {
'http-01': function (me, auth) {
var url = 'http://' + auth.hostname + ACME.challengePrefixes['http-01'] + '/' + auth.token;
return me._request({ url: url }).then(function (resp) {
var err;
// TODO limit the number of bytes that are allowed to be downloaded
if (auth.keyAuthorization === resp.body.toString('utf8').trim()) {
return true;
}
err = new Error(
"Error: Failed HTTP-01 Pre-Flight / Dry Run.\n"
+ "curl '" + url + "'\n"
+ "Expected: '" + auth.keyAuthorization + "'\n"
+ "Got: '" + resp.body + "'\n"
+ "See https://git.coolaj86.com/coolaj86/acme-v2.js/issues/4"
);
err.code = 'E_FAIL_DRY_CHALLENGE';
return Promise.reject(err);
});
}
, 'dns-01': function (me, auth) {
// remove leading *. on wildcard domains
var hostname = ACME.challengePrefixes['dns-01'] + '.' + auth.hostname.replace(/^\*\./, '');
return me._dig({
type: 'TXT'
, name: hostname
}).then(function (ans) {
var err;
if (ans.answer.some(function (txt) {
return auth.dnsAuthorization === txt.data[0];
})) {
return true;
}
err = new Error(
"Error: Failed DNS-01 Pre-Flight Dry Run.\n"
+ "dig TXT '" + hostname + "' does not return '" + auth.dnsAuthorization + "'\n"
+ "See https://git.coolaj86.com/coolaj86/acme-v2.js/issues/4"
);
err.code = 'E_FAIL_DRY_CHALLENGE';
return Promise.reject(err);
});
}
};
ACME._getUserAgentString = function (deps) {
var uaDefaults = {
pkg: "Greenlock/" + deps.pkg.version
, os: "(" + deps.os.type() + "; " + deps.process.arch + " " + deps.os.platform() + " " + deps.os.release() + ")"
, node: "Node.js/" + deps.process.version
, user: ''
};
var userAgent = [];
//Object.keys(currentUAProps)
Object.keys(uaDefaults).forEach(function (key) {
if (uaDefaults[key]) {
userAgent.push(uaDefaults[key]);
}
});
return userAgent.join(' ').trim();
};
ACME._directory = function (me) {
return me._request({ url: me.directoryUrl, json: true });
};
ACME._getNonce = function (me) {
if (me._nonce) { return new Promise(function (resolve) { resolve(me._nonce); return; }); }
return me._request({ method: 'HEAD', url: me._directoryUrls.newNonce }).then(function (resp) {
me._nonce = resp.toJSON().headers['replay-nonce'];
return me._nonce;
});
};
// ACME RFC Section 7.3 Account Creation
/*
{
"protected": base64url({
"alg": "ES256",
"jwk": {...},
"nonce": "6S8IqOGY7eL2lsGoTZYifg",
"url": "https://example.com/acme/new-account"
}),
"payload": base64url({
"termsOfServiceAgreed": true,
"onlyReturnExisting": false,
"contact": [
"mailto:cert-admin@example.com",
"mailto:admin@example.com"
]
}),
"signature": "RZPOnYoPs1PhjszF...-nh6X1qtOFPB519I"
}
*/
ACME._registerAccount = function (me, options) {
if (me.debug) { console.debug('[acme-v2] accounts.create'); }
return ACME._getNonce(me).then(function () {
return new Promise(function (resolve, reject) {
function agree(tosUrl) {
var err;
if (me._tos !== tosUrl) {
err = new Error("You must agree to the ToS at '" + me._tos + "'");
err.code = "E_AGREE_TOS";
reject(err);
return;
}
var jwk = me.RSA.exportPublicJwk(options.accountKeypair);
var contact;
if (options.contact) {
contact = options.contact.slice(0);
} else if (options.email) {
contact = [ 'mailto:' + options.email ];
}
var body = {
termsOfServiceAgreed: tosUrl === me._tos
, onlyReturnExisting: false
, contact: contact
};
if (options.externalAccount) {
// TODO is this really done by HMAC or is it arbitrary?
body.externalAccountBinding = me.RSA.signJws(
options.externalAccount.secret
, undefined
, { alg: "HS256"
, kid: options.externalAccount.id
, url: me._directoryUrls.newAccount
}
, Buffer.from(JSON.stringify(jwk))
);
}
var payload = JSON.stringify(body);
var jws = me.RSA.signJws(
options.accountKeypair
, undefined
, { nonce: me._nonce
, alg: 'RS256'
, url: me._directoryUrls.newAccount
, jwk: jwk
}
, Buffer.from(payload)
);
delete jws.header;
if (me.debug) { console.debug('[acme-v2] accounts.create JSON body:'); }
if (me.debug) { console.debug(jws); }
me._nonce = null;
return me._request({
method: 'POST'
, url: me._directoryUrls.newAccount
, headers: { 'Content-Type': 'application/jose+json' }
, json: jws
}).then(function (resp) {
var account = resp.body;
if (2 !== Math.floor(resp.statusCode / 100)) {
throw new Error('account error: ' + JSON.stringify(body));
}
me._nonce = resp.toJSON().headers['replay-nonce'];
var location = resp.toJSON().headers.location;
// the account id url
me._kid = location;
if (me.debug) { console.debug('[DEBUG] new account location:'); }
if (me.debug) { console.debug(location); }
if (me.debug) { console.debug(resp.toJSON()); }
/*
{
contact: ["mailto:jon@example.com"],
orders: "https://some-url",
status: 'valid'
}
*/
if (!account) { account = { _emptyResponse: true, key: {} }; }
// https://git.coolaj86.com/coolaj86/acme-v2.js/issues/8
if (!account.key) { account.key = {}; }
account.key.kid = me._kid;
return account;
}).then(resolve, reject);
}
if (me.debug) { console.debug('[acme-v2] agreeToTerms'); }
if (1 === options.agreeToTerms.length) {
// newer promise API
return options.agreeToTerms(me._tos).then(agree, reject);
}
else if (2 === options.agreeToTerms.length) {
// backwards compat cb API
return options.agreeToTerms(me._tos, function (err, tosUrl) {
if (!err) { agree(tosUrl); return; }
reject(err);
});
}
else {
reject(new Error('agreeToTerms has incorrect function signature.'
+ ' Should be fn(tos) { return Promise<tos>; }'));
}
});
});
};
/*
POST /acme/new-order HTTP/1.1
Host: example.com
Content-Type: application/jose+json
{
"protected": base64url({
"alg": "ES256",
"kid": "https://example.com/acme/acct/1",
"nonce": "5XJ1L3lEkMG7tR6pA00clA",
"url": "https://example.com/acme/new-order"
}),
"payload": base64url({
"identifiers": [{"type:"dns","value":"example.com"}],
"notBefore": "2016-01-01T00:00:00Z",
"notAfter": "2016-01-08T00:00:00Z"
}),
"signature": "H6ZXtGjTZyUnPeKn...wEA4TklBdh3e454g"
}
*/
ACME._getChallenges = function (me, options, auth) {
if (me.debug) { console.debug('\n[DEBUG] getChallenges\n'); }
return me._request({ method: 'GET', url: auth, json: true }).then(function (resp) {
return resp.body;
});
};
ACME._wait = function wait(ms) {
return new Promise(function (resolve) {
setTimeout(resolve, (ms || 1100));
});
};
ACME._testChallenges = function (me, options) {
if (me.skipChallengeTest) {
return Promise.resolve();
}
return Promise.all(options.domains.map(function (identifierValue) {
// TODO we really only need one to pass, not all to pass
return Promise.all(options.challengeTypes.map(function (chType) {
var chToken = require('crypto').randomBytes(16).toString('hex');
var thumbprint = me.RSA.thumbprint(options.accountKeypair);
var keyAuthorization = chToken + '.' + thumbprint;
var auth = {
identifier: { type: "dns", value: identifierValue }
, hostname: identifierValue
, type: chType
, token: chToken
, thumbprint: thumbprint
, keyAuthorization: keyAuthorization
, dnsAuthorization: me.RSA.utils.toWebsafeBase64(
require('crypto').createHash('sha256').update(keyAuthorization).digest('base64')
)
};
return ACME._setChallenge(me, options, auth).then(function () {
return ACME.challengeTests[chType](me, auth);
});
}));
}));
};
// https://tools.ietf.org/html/draft-ietf-acme-acme-10#section-7.5.1
ACME._postChallenge = function (me, options, identifier, ch) {
var RETRY_INTERVAL = me.retryInterval || 1000;
var DEAUTH_INTERVAL = me.deauthWait || 10 * 1000;
var MAX_POLL = me.retryPoll || 8;
var MAX_PEND = me.retryPending || 4;
var count = 0;
var thumbprint = me.RSA.thumbprint(options.accountKeypair);
var keyAuthorization = ch.token + '.' + thumbprint;
// keyAuthorization = token || '.' || base64url(JWK_Thumbprint(accountKey))
// /.well-known/acme-challenge/:token
var auth = {
identifier: identifier
, hostname: identifier.value
, type: ch.type
, token: ch.token
, thumbprint: thumbprint
, keyAuthorization: keyAuthorization
, dnsAuthorization: me.RSA.utils.toWebsafeBase64(
require('crypto').createHash('sha256').update(keyAuthorization).digest('base64')
)
};
/*
POST /acme/authz/1234 HTTP/1.1
Host: example.com
Content-Type: application/jose+json
{
"protected": base64url({
"alg": "ES256",
"kid": "https://example.com/acme/acct/1",
"nonce": "xWCM9lGbIyCgue8di6ueWQ",
"url": "https://example.com/acme/authz/1234"
}),
"payload": base64url({
"status": "deactivated"
}),
"signature": "srX9Ji7Le9bjszhu...WTFdtujObzMtZcx4"
}
*/
function deactivate() {
var jws = me.RSA.signJws(
options.accountKeypair
, undefined
, { nonce: me._nonce, alg: 'RS256', url: ch.url, kid: me._kid }
, Buffer.from(JSON.stringify({ "status": "deactivated" }))
);
me._nonce = null;
return me._request({
method: 'POST'
, url: ch.url
, headers: { 'Content-Type': 'application/jose+json' }
, json: jws
}).then(function (resp) {
if (me.debug) { console.debug('[acme-v2.js] deactivate:'); }
if (me.debug) { console.debug(resp.headers); }
if (me.debug) { console.debug(resp.body); }
if (me.debug) { console.debug(); }
me._nonce = resp.toJSON().headers['replay-nonce'];
if (me.debug) { console.debug('deactivate challenge: resp.body:'); }
if (me.debug) { console.debug(resp.body); }
return ACME._wait(DEAUTH_INTERVAL);
});
}
function pollStatus() {
if (count >= MAX_POLL) {
return Promise.reject(new Error(
"[acme-v2] stuck in bad pending/processing state for '" + identifier.value + "'"
));
}
count += 1;
if (me.debug) { console.debug('\n[DEBUG] statusChallenge\n'); }
return me._request({ method: 'GET', url: ch.url, json: true }).then(function (resp) {
if ('processing' === resp.body.status) {
if (me.debug) { console.debug('poll: again'); }
return ACME._wait(RETRY_INTERVAL).then(pollStatus);
}
// This state should never occur
if ('pending' === resp.body.status) {
if (count >= MAX_PEND) {
return ACME._wait(RETRY_INTERVAL).then(deactivate).then(respondToChallenge);
}
if (me.debug) { console.debug('poll: again'); }
return ACME._wait(RETRY_INTERVAL).then(respondToChallenge);
}
if ('valid' === resp.body.status) {
if (me.debug) { console.debug('poll: valid'); }
try {
if (1 === options.removeChallenge.length) {
options.removeChallenge(auth).then(function () {}, function () {});
} else if (2 === options.removeChallenge.length) {
options.removeChallenge(auth, function (err) { return err; });
} else {
options.removeChallenge(identifier.value, ch.token, function () {});
}
} catch(e) {}
return resp.body;
}
var errmsg;
if (!resp.body.status) {
errmsg = "[acme-v2] (E_STATE_EMPTY) empty challenge state for '" + identifier.value + "':";
}
else if ('invalid' === resp.body.status) {
errmsg = "[acme-v2] (E_STATE_INVALID) challenge state for '" + identifier.value + "': '" + resp.body.status + "'";
}
else {
errmsg = "[acme-v2] (E_STATE_UKN) challenge state for '" + identifier.value + "': '" + resp.body.status + "'";
}
return Promise.reject(new Error(errmsg));
});
}
function respondToChallenge() {
var jws = me.RSA.signJws(
options.accountKeypair
, undefined
, { nonce: me._nonce, alg: 'RS256', url: ch.url, kid: me._kid }
, Buffer.from(JSON.stringify({ }))
);
me._nonce = null;
return me._request({
method: 'POST'
, url: ch.url
, headers: { 'Content-Type': 'application/jose+json' }
, json: jws
}).then(function (resp) {
if (me.debug) { console.debug('[acme-v2.js] challenge accepted!'); }
if (me.debug) { console.debug(resp.headers); }
if (me.debug) { console.debug(resp.body); }
if (me.debug) { console.debug(); }
me._nonce = resp.toJSON().headers['replay-nonce'];
if (me.debug) { console.debug('respond to challenge: resp.body:'); }
if (me.debug) { console.debug(resp.body); }
return ACME._wait(RETRY_INTERVAL).then(pollStatus);
});
}
return ACME._setChallenge(me, options, auth).then(respondToChallenge);
};
ACME._setChallenge = function (me, options, auth) {
return new Promise(function (resolve, reject) {
try {
if (1 === options.setChallenge.length) {
options.setChallenge(auth).then(resolve).catch(reject);
} else if (2 === options.setChallenge.length) {
options.setChallenge(auth, function (err) {
if(err) { reject(err); } else { resolve(); }
});
} else {
var challengeCb = function(err) {
if(err) { reject(err); } else { resolve(); }
};
// for backwards compat adding extra keys without changing params length
Object.keys(auth).forEach(function (key) {
challengeCb[key] = auth[key];
});
options.setChallenge(auth.identifier.value, auth.token, auth.keyAuthorization, challengeCb);
}
} catch(e) {
reject(e);
}
}).then(function () {
// TODO: Do we still need this delay? Or shall we leave it to plugins to account for themselves?
var DELAY = me.setChallengeWait || 500;
if (me.debug) { console.debug('\n[DEBUG] waitChallengeDelay %s\n', DELAY); }
return ACME._wait(DELAY);
});
};
ACME._finalizeOrder = function (me, options, validatedDomains) {
if (me.debug) { console.debug('finalizeOrder:'); }
var csr = me.RSA.generateCsrWeb64(options.domainKeypair, validatedDomains);
var body = { csr: csr };
var payload = JSON.stringify(body);
function pollCert() {
var jws = me.RSA.signJws(
options.accountKeypair
, undefined
, { nonce: me._nonce, alg: 'RS256', url: me._finalize, kid: me._kid }
, Buffer.from(payload)
);
if (me.debug) { console.debug('finalize:', me._finalize); }
me._nonce = null;
return me._request({
method: 'POST'
, url: me._finalize
, headers: { 'Content-Type': 'application/jose+json' }
, json: jws
}).then(function (resp) {
// https://tools.ietf.org/html/draft-ietf-acme-acme-12#section-7.1.3
// Possible values are: "pending" => ("invalid" || "ready") => "processing" => "valid"
me._nonce = resp.toJSON().headers['replay-nonce'];
if (me.debug) { console.debug('order finalized: resp.body:'); }
if (me.debug) { console.debug(resp.body); }
if ('valid' === resp.body.status) {
me._expires = resp.body.expires;
me._certificate = resp.body.certificate;
return resp.body; // return order
}
if ('processing' === resp.body.status) {
return ACME._wait().then(pollCert);
}
if (me.debug) { console.debug("Error: bad status:\n" + JSON.stringify(resp.body, null, 2)); }
if ('pending' === resp.body.status) {
return Promise.reject(new Error(
"Did not finalize order: status 'pending'."
+ " Best guess: You have not accepted at least one challenge for each domain:\n"
+ "Requested: '" + options.domains.join(', ') + "'\n"
+ "Validated: '" + validatedDomains.join(', ') + "'\n"
+ JSON.stringify(resp.body, null, 2)
));
}
if ('invalid' === resp.body.status) {
return Promise.reject(new Error(
"Did not finalize order: status 'invalid'."
+ " Best guess: One or more of the domain challenges could not be verified"
+ " (or the order was canceled).\n"
+ "Requested: '" + options.domains.join(', ') + "'\n"
+ "Validated: '" + validatedDomains.join(', ') + "'\n"
+ JSON.stringify(resp.body, null, 2)
));
}
if ('ready' === resp.body.status) {
return Promise.reject(new Error(
"Did not finalize order: status 'ready'."
+ " Hmmm... this state shouldn't be possible here. That was the last state."
+ " This one should at least be 'processing'.\n"
+ "Requested: '" + options.domains.join(', ') + "'\n"
+ "Validated: '" + validatedDomains.join(', ') + "'\n"
+ JSON.stringify(resp.body, null, 2) + "\n\n"
+ "Please open an issue at https://git.coolaj86.com/coolaj86/acme-v2.js"
));
}
return Promise.reject(new Error(
"Didn't finalize order: Unhandled status '" + resp.body.status + "'."
+ " This is not one of the known statuses...\n"
+ "Requested: '" + options.domains.join(', ') + "'\n"
+ "Validated: '" + validatedDomains.join(', ') + "'\n"
+ JSON.stringify(resp.body, null, 2) + "\n\n"
+ "Please open an issue at https://git.coolaj86.com/coolaj86/acme-v2.js"
));
});
}
return pollCert();
};
ACME._getCertificate = function (me, options) {
if (me.debug) { console.debug('[acme-v2] DEBUG get cert 1'); }
if (!options.challengeTypes) {
if (!options.challengeType) {
return Promise.reject(new Error("challenge type must be specified"));
}
options.challengeTypes = [ options.challengeType ];
}
if (!me._kid) {
if (options.accountKid) {
me._kid = options.accountKid;
} else {
//return Promise.reject(new Error("must include KeyID"));
return ACME._registerAccount(me, options).then(function () {
return ACME._getCertificate(me, options);
});
}
}
return ACME._testChallenges(me, options).then(function () {
if (me.debug) { console.debug('[acme-v2] certificates.create'); }
return ACME._getNonce(me).then(function () {
var body = {
identifiers: options.domains.map(function (hostname) {
return { type: "dns" , value: hostname };
})
//, "notBefore": "2016-01-01T00:00:00Z"
//, "notAfter": "2016-01-08T00:00:00Z"
};
var payload = JSON.stringify(body);
var jws = me.RSA.signJws(
options.accountKeypair
, undefined
, { nonce: me._nonce, alg: 'RS256', url: me._directoryUrls.newOrder, kid: me._kid }
, Buffer.from(payload)
);
if (me.debug) { console.debug('\n[DEBUG] newOrder\n'); }
me._nonce = null;
return me._request({
method: 'POST'
, url: me._directoryUrls.newOrder
, headers: { 'Content-Type': 'application/jose+json' }
, json: jws
}).then(function (resp) {
me._nonce = resp.toJSON().headers['replay-nonce'];
var location = resp.toJSON().headers.location;
var auths;
if (me.debug) { console.debug(location); } // the account id url
if (me.debug) { console.debug(resp.toJSON()); }
me._authorizations = resp.body.authorizations;
me._order = location;
me._finalize = resp.body.finalize;
//if (me.debug) console.debug('[DEBUG] finalize:', me._finalize); return;
if (!me._authorizations) {
return Promise.reject(new Error(
"[acme-v2.js] authorizations were not fetched for '" + options.domains.join() + "':\n"
+ JSON.stringify(resp.body)
));
}
if (me.debug) { console.debug("[acme-v2] POST newOrder has authorizations"); }
//return resp.body;
auths = me._authorizations.slice(0);
function next() {
var authUrl = auths.shift();
if (!authUrl) { return; }
return ACME._getChallenges(me, options, authUrl).then(function (results) {
// var domain = options.domains[i]; // results.identifier.value
var chType = options.challengeTypes.filter(function (chType) {
return results.challenges.some(function (ch) {
return ch.type === chType;
});
}).sort(function (aType, bType) {
var a = results.challenges.filter(function (ch) { return ch.type === aType; })[0];
var b = results.challenges.filter(function (ch) { return ch.type === bType; })[0];
if ('valid' === a.status) { return 1; }
if ('valid' === b.status) { return -1; }
return 0;
})[0];
var challenge = results.challenges.filter(function (ch) {
if (chType === ch.type) {
return ch;
}
})[0];
if (!challenge) {
return Promise.reject(new Error(
"Server didn't offer any challenge we can handle for '" + options.domains.join() + "'."
));
}
if ("valid" === challenge.status) {
return;
}
return ACME._postChallenge(me, options, results.identifier, challenge);
}).then(function () {
return next();
});
}
return next().then(function () {
if (me.debug) { console.debug("[getCertificate] next.then"); }
var validatedDomains = body.identifiers.map(function (ident) {
return ident.value;
});
return ACME._finalizeOrder(me, options, validatedDomains);
}).then(function (order) {
if (me.debug) { console.debug('acme-v2: order was finalized'); }
return me._request({ method: 'GET', url: me._certificate, json: true }).then(function (resp) {
if (me.debug) { console.debug('acme-v2: csr submitted and cert received:'); }
// https://github.com/certbot/certbot/issues/5721
var certsarr = ACME.splitPemChain(ACME.formatPemChain((resp.body||'')));
// cert, chain, fullchain, privkey, /*TODO, subject, altnames, issuedAt, expiresAt */
var certs = {
expires: order.expires
, identifiers: order.identifiers
//, authorizations: order.authorizations
, cert: certsarr.shift()
//, privkey: privkeyPem
, chain: certsarr.join('\n')
};
if (me.debug) { console.debug(certs); }
return certs;
});
});
});
});
});
};
ACME.create = function create(me) {
if (!me) { me = {}; }
// me.debug = true;
me.challengePrefixes = ACME.challengePrefixes;
me.RSA = me.RSA || require('rsa-compat').RSA;
me.request = me.request || require('@coolaj86/urequest');
me._dig = function (query) {
// TODO use digd.js
return new Promise(function (resolve, reject) {
var dns = require('dns');
dns.resolveTxt(query.name, function (err, records) {
if (err) { reject(err); return; }
resolve({
answer: records.map(function (rr) {
return {
data: rr
};
})
});
});
});
};
me.promisify = me.promisify || require('util').promisify /*node v8+*/ || require('bluebird').promisify /*node v6*/;
if ('function' !== typeof me.getUserAgentString) {
me.pkg = me.pkg || require('./package.json');
me.os = me.os || require('os');
me.process = me.process || require('process');
me.userAgent = ACME._getUserAgentString(me);
}
function getRequest(opts) {
if (!opts) { opts = {}; }
return me.request.defaults({
headers: {
'User-Agent': opts.userAgent || me.userAgent || me.getUserAgentString(me)
}
});
}
if ('function' !== typeof me._request) {
me._request = me.promisify(getRequest({}));
}
me.init = function (_directoryUrl) {
me.directoryUrl = me.directoryUrl || _directoryUrl;
return ACME._directory(me).then(function (resp) {
me._directoryUrls = resp.body;
me._tos = me._directoryUrls.meta.termsOfService;
return me._directoryUrls;
});
};
me.accounts = {
create: function (options) {
return ACME._registerAccount(me, options);
}
};
me.certificates = {
create: function (options) {
return ACME._getCertificate(me, options);
}
};
return me;
};
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