greenlock.js/index.js

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'use strict';
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// TODO handle www and no-www together somehow?
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var PromiseA = require('bluebird');
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var crypto = require('crypto');
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var tls = require('tls');
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var LE = module.exports;
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LE.liveServer = "https://acme-v01.api.letsencrypt.org/directory";
LE.stagingServer = "https://acme-staging.api.letsencrypt.org/directory";
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LE.merge = function merge(defaults, args) {
var copy = {};
Object.keys(defaults).forEach(function (key) {
copy[key] = defaults[key];
});
Object.keys(args).forEach(function (key) {
copy[key] = args[key];
});
return copy;
};
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LE.create = function (backend, defaults, handlers) {
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if (!handlers) { handlers = {}; }
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if (!handlers.lifetime) { handlers.lifetime = 90 * 24 * 60 * 60 * 1000; }
if (!handlers.renewWithin) { handlers.renewWithin = 3 * 24 * 60 * 60 * 1000; }
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if (!handlers.memorizeFor) { handlers.memorizeFor = 1 * 24 * 60 * 60 * 1000; }
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if (!handlers.sniRegisterCallback) {
handlers.sniRegisterCallback = function (args, cache, cb) {
// TODO when we have ECDSA, just do this automatically
cb(null, null);
};
}
backend = PromiseA.promisifyAll(backend);
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var utils = require('./utils');
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//var attempts = {}; // should exist in master process only
var ipc = {}; // in-process cache
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var le;
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// TODO check certs on initial load
// TODO expect that certs expire every 90 days
// TODO check certs with setInterval?
//options.cacheContextsFor = options.cacheContextsFor || (1 * 60 * 60 * 1000);
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function sniCallback(hostname, cb) {
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var args = LE.merge(defaults, {});
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args.domains = [hostname];
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le.fetch(args, function (err, cache) {
if (err) {
cb(err);
return;
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}
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// vazhdo is Albanian for 'continue'
function vazhdo(err, c2) {
if (err) {
cb(err);
return;
}
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cache = c2 || cache;
if (!cache.context) {
cache.context = tls.createSecureContext({
key: cache.key // privkey.pem
, cert: cache.cert // fullchain.pem
//, ciphers // node's defaults are great
});
}
cb(null, cache.context);
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}
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if (cache) {
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vazhdo();
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return;
}
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var args = LE.merge(defaults, { domains: [hostname] });
handlers.sniRegisterCallback(args, cache, vazhdo);
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});
}
le = {
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validate: function (hostnames, cb) {
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// TODO check dns, etc
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if ((!hostnames.length && hostnames.every(le.isValidDomain))) {
cb(new Error("node-letsencrypt: invalid hostnames: " + hostnames.join(',')));
return;
}
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//
// IMPORTANT
//
// Before attempting a dynamic registration you need to validate that
//
// * these are hostnames that you expected to exist on the system
// * their A records currently point to this ip
// * this system's ip hasn't changed
//
// If you do not check these things, then someone could attack you
// and cause you, in return, to have your ip be rate-limit blocked
//
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console.warn("[SECURITY WARNING]: node-letsencrypt: validate(hostnames, cb) NOT IMPLEMENTED");
cb(null, true);
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}
, middleware: function () {
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//console.log('[DEBUG] webrootPath', defaults.webrootPath);
var serveStatic = require('serve-static')(defaults.webrootPath, { dotfiles: 'allow' });
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var prefix = '/.well-known/acme-challenge/';
return function (req, res, next) {
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if (0 !== req.url.indexOf(prefix)) {
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next();
return;
}
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serveStatic(req, res, next);
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};
}
, SNICallback: sniCallback
, sniCallback: sniCallback
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, _registerHelper: function (args, cb) {
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var copy = LE.merge(defaults, args);
var err;
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if (!utils.isValidDomain(args.domains[0])) {
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err = new Error("invalid domain");
err.code = "INVALID_DOMAIN";
cb(err);
return;
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}
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return le.validate(args.domains, function (err) {
if (err) {
cb(err);
return;
}
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console.log("[NLE]: begin registration");
return backend.registerAsync(copy).then(function () {
console.log("[NLE]: end registration");
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// calls fetch because fetch calls cacheCertInfo
return le.fetch(args, cb);
}, cb);
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});
}
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, _fetchHelper: function (args, cb) {
return backend.fetchAsync(args).then(function (certInfo) {
if (!certInfo) {
cb(null, null);
return;
}
var now = Date.now();
// key, cert, issuedAt, lifetime, expiresAt
if (!certInfo.expiresAt) {
certInfo.expiresAt = certInfo.issuedAt + (certInfo.lifetime || handlers.lifetime);
}
if (!certInfo.lifetime) {
certInfo.lifetime = (certInfo.lifetime || handlers.lifetime);
}
// a pretty good hard buffer
certInfo.expiresAt -= (1 * 24 * 60 * 60 * 100);
certInfo = LE.cacheCertInfo(args, certInfo, ipc, handlers);
if (now > certInfo.bestIfUsedBy && !certInfo.timeout) {
// EXPIRING
if (now > certInfo.expiresAt) {
// EXPIRED
certInfo.renewTimeout = Math.floor(certInfo.renewTimeout / 2);
}
certInfo.timeout = setTimeout(function () {
le.register(args, cb);
}, certInfo.renewTimeout);
}
cb(null, certInfo.context);
}, cb);
}
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, fetch: function (args, cb) {
var hostname = args.domains[0];
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// TODO don't call now() every time because this is hot code
var now = Date.now();
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var certInfo = ipc[hostname];
// TODO once ECDSA is available, wait for cert renewal if its due
if (certInfo) {
if (now > certInfo.bestIfUsedBy && !certInfo.timeout) {
// EXPIRING
if (now > certInfo.expiresAt) {
// EXPIRED
certInfo.renewTimeout = Math.floor(certInfo.renewTimeout / 2);
}
certInfo.timeout = setTimeout(function () {
le.register(args, cb);
}, certInfo.renewTimeout);
}
cb(null, certInfo.context);
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if ((now - certInfo.loadedAt) < (certInfo.memorizeFor)) {
// these aren't stale, so don't fall through
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return;
}
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}
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le._fetchHelper(args, cb);
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}
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, register: function (args, cb) {
// this may be run in a cluster environment
// in that case it should NOT check the cache
// but ensure that it has the most fresh copy
// before attempting a renew
le._fetchHelper(args, function (err, hit) {
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var hostname = args.domains[0];
if (err) {
cb(err);
return;
}
else if (hit) {
cb(null, hit);
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return;
}
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return le._registerHelper(args, function (err) {
if (err) {
cb(err);
return;
}
le._fetchHelper(args, function (err, cache) {
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if (cache) {
cb(null, cache.context);
return;
}
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// still couldn't read the certs after success... that's weird
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cb(err, null);
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});
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}, function (err) {
console.error("[Error] Let's Encrypt failed:");
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console.error(err.stack || new Error(err.message || err.toString()).stack);
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// wasn't successful with lets encrypt, don't automatically try again for 12 hours
// TODO what's the better way to handle this?
// failure callback?
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ipc[hostname] = {
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context: null // TODO default context
, issuedAt: Date.now()
, lifetime: (12 * 60 * 60 * 1000)
// , expiresAt: generated in next step
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};
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cb(err, ipc[hostname]);
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});
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});
}
};
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return le;
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};
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LE.cacheCertInfo = function (args, certInfo, ipc, handlers) {
// TODO IPC via process and worker to guarantee no races
// rather than just "really good odds"
var hostname = args.domains[0];
var now = Date.now();
// Stagger randomly by plus 0% to 25% to prevent all caches expiring at once
var rnd1 = (crypto.randomBytes(1)[0] / 255);
var memorizeFor = Math.floor(handlers.memorizeFor + ((handlers.memorizeFor / 4) * rnd1));
// Stagger randomly to renew between n and 2n days before renewal is due
// this *greatly* reduces the risk of multiple cluster processes renewing the same domain at once
var rnd2 = (crypto.randomBytes(1)[0] / 255);
var bestIfUsedBy = certInfo.expiresAt - (handlers.renewWithin + Math.floor(handlers.renewWithin * rnd2));
// Stagger randomly by plus 0 to 5 min to reduce risk of multiple cluster processes
// renewing at once on boot when the certs have expired
var rnd3 = (crypto.randomBytes(1)[0] / 255);
var renewTimeout = Math.floor((5 * 60 * 1000) * rnd3);
certInfo.context = tls.createSecureContext({
key: certInfo.key
, cert: certInfo.cert
//, ciphers // node's defaults are great
});
certInfo.loadedAt = now;
certInfo.memorizeFor = memorizeFor;
certInfo.bestIfUsedBy = bestIfUsedBy;
certInfo.renewTimeout = renewTimeout;
ipc[hostname] = certInfo;
return ipc[hostname];
};