262 lines
8.1 KiB
JavaScript
262 lines
8.1 KiB
JavaScript
'use strict';
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var crypto = require('crypto');
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var tls = require('tls');
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module.exports.create = function (opts) {
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var ipc = {}; // in-process cache
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// function (/*err, hostname, certInfo*/) {}
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function handleRenewFailure(err, hostname, certInfo) {
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console.error("ERROR: Failed to renew domain '", hostname, "':");
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if (err) {
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console.error(err.stack || err);
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}
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if (certInfo) {
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console.error(certInfo);
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}
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}
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if (!opts) { throw new Error("requires opts to be an object"); }
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if (opts.debug) {
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console.debug("[LEX] creating sniCallback", JSON.stringify(opts, function(k,v){
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if(v instanceof Array)
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return JSON.stringify(v);
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return v;
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},' '));
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}
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if (!opts.letsencrypt) { throw new Error("requires opts.letsencrypt to be a letsencrypt instance"); }
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if (!opts.lifetime) { opts.lifetime = 90 * 24 * 60 * 60 * 1000; }
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if (!opts.failedWait) { opts.failedWait = 5 * 60 * 1000; }
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if (!opts.renewWithin) { opts.renewWithin = 3 * 24 * 60 * 60 * 1000; }
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if (!opts.memorizeFor) { opts.memorizeFor = 1 * 24 * 60 * 60 * 1000; }
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if (!opts.approveRegistration) { opts.approveRegistration = function (hostname, cb) { cb(null, null); }; }
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//opts.approveRegistration = function (hostname, cb) { cb(null, null); };
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if (!opts.handleRenewFailure) { opts.handleRenewFailure = handleRenewFailure; }
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function assignBestByDates(now, certInfo) {
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certInfo = certInfo || { loadedAt: now, expiresAt: 0, issuedAt: 0, lifetime: 0 };
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var rnds = crypto.randomBytes(3);
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var rnd1 = ((rnds[0] + 1) / 257);
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var rnd2 = ((rnds[1] + 1) / 257);
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var rnd3 = ((rnds[2] + 1) / 257);
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// Stagger randomly by plus 0% to 25% to prevent all caches expiring at once
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var memorizeFor = Math.floor(opts.memorizeFor + ((opts.memorizeFor / 4) * rnd1));
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// Stagger randomly to renew between n and 2n days before renewal is due
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// this *greatly* reduces the risk of multiple cluster processes renewing the same domain at once
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var bestIfUsedBy = certInfo.expiresAt - (opts.renewWithin + Math.floor(opts.renewWithin * rnd2));
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// Stagger randomly by plus 0 to 5 min to reduce risk of multiple cluster processes
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// renewing at once on boot when the certs have expired
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var renewTimeout = Math.floor((5 * 60 * 1000) * rnd3);
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certInfo.loadedAt = now;
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certInfo.memorizeFor = memorizeFor;
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certInfo.bestIfUsedBy = bestIfUsedBy;
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certInfo.renewTimeout = renewTimeout;
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return certInfo;
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}
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function renewInBackground(now, hostname, certInfo) {
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if ((now - certInfo.loadedAt) < opts.failedWait) {
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// wait a few minutes
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return;
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}
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if (now > certInfo.bestIfUsedBy && !certInfo.timeout) {
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// EXPIRING
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if (now > certInfo.expiresAt) {
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// EXPIRED
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certInfo.renewTimeout = Math.floor(certInfo.renewTimeout / 2);
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}
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if (opts.debug) {
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console.debug("[LEX] skipping stagger '" + certInfo.renewTimeout + "' and renewing '" + hostname + "' now");
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certInfo.renewTimeout = 500;
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}
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certInfo.timeout = setTimeout(function () {
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var args = { domains: [ hostname ], duplicate: false };
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opts.letsencrypt.renew(args, function (err, certInfo) {
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if (err || !certInfo) {
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opts.handleRenewFailure(err, hostname, certInfo);
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}
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ipc[hostname] = assignBestByDates(now, certInfo);
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});
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}, certInfo.renewTimeout);
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}
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}
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function cacheResult(err, hostname, certInfo, sniCb) {
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if (certInfo && certInfo.fullchain && certInfo.privkey) {
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if (opts.debug) {
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console.debug('cert is looking good');
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}
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try {
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certInfo.tlsContext = tls.createSecureContext({
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key: certInfo.privkey || certInfo.key // privkey.pem
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, cert: certInfo.fullchain || certInfo.cert // fullchain.pem (cert.pem + '\n' + chain.pem)
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});
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} catch(e) {
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console.warn("[Sanity Check Fail]: a weird object was passed back through le.fetch to lex.fetch");
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console.warn("(either missing or malformed certInfo.key and / or certInfo.fullchain)");
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err = e;
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}
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sniCb(err, certInfo.tlsContext);
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} else {
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if (opts.debug) {
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console.debug('cert is NOT looking good');
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}
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sniCb(err || new Error("couldn't get certInfo: unknown"), null);
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}
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var now = Date.now();
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certInfo = ipc[hostname] = assignBestByDates(now, certInfo);
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renewInBackground(now, hostname, certInfo);
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}
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function registerCert(hostname, sniCb) {
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if (opts.debug) {
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console.debug("[LEX] '" + hostname + "' is not registered, requesting approval");
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}
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if (!hostname) {
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sniCb(new Error('[registerCert] no hostname'));
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return;
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}
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opts.approveRegistration(hostname, function (err, args) {
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if (opts.debug) {
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console.debug("[LEX] '" + hostname + "' registration approved, attempting register");
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}
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if (err) {
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cacheResult(err, hostname, null, sniCb);
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return;
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}
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if (!(args && args.agreeTos && args.email && args.domains)) {
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cacheResult(new Error("not approved or approval is missing arguments - such as agreeTos, email, domains"), hostname, null, sniCb);
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return;
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}
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opts.letsencrypt.register(args, function (err, certInfo) {
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if (opts.debug) {
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console.debug("[LEX] '" + hostname + "' register completed", err && err.stack || null, certInfo);
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if ((!err || !err.stack) && !certInfo) {
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console.error((new Error("[LEX] SANITY FAIL: no error and yet no certs either")).stack);
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}
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}
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cacheResult(err, hostname, certInfo, sniCb);
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});
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});
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}
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function fetch(hostname, sniCb) {
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if (!hostname) {
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sniCb(new Error('[sniCallback] [fetch] no hostname'));
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return;
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}
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opts.letsencrypt.fetch({ domains: [hostname] }, function (err, certInfo) {
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if (opts.debug) {
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console.debug("[LEX] fetch from disk result '" + hostname + "':");
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console.debug(certInfo && Object.keys(certInfo));
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if (err) {
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console.error(err.stack || err);
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}
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}
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if (err) {
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sniCb(err, null);
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return;
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}
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if (certInfo) {
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cacheResult(err, hostname, certInfo, sniCb);
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return;
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}
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registerCert(hostname, sniCb);
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});
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}
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return function sniCallback(hostname, cb) {
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var now = Date.now();
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var certInfo = ipc[hostname];
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if (!hostname) {
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cb(new Error('[sniCallback] no hostname'));
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return;
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}
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//
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// No cert is available in cache.
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// try to fetch it from disk quickly
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// and return to the browser
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//
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if (!certInfo) {
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if (opts.debug) {
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console.debug("[LEX] no certs loaded for '" + hostname + "'");
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}
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fetch(hostname, cb);
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return;
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}
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//
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// A cert is available
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// See if it's old enough that
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// we should refresh it from disk
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// (in the background)
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//
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// TODO once ECDSA is available, wait for cert renewal if its due (maybe?)
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if (certInfo.tlsContext) {
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cb(null, certInfo.tlsContext);
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if ((now - certInfo.loadedAt) < (certInfo.memorizeFor)) {
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// these aren't stale, so don't fall through
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if (opts.debug) {
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console.debug("[LEX] certs for '" + hostname + "' are fresh from disk");
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}
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return;
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}
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}
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else if ((now - certInfo.loadedAt) < opts.failedWait) {
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if (opts.debug) {
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console.debug("[LEX] certs for '" + hostname + "' recently failed and are still in cool down");
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}
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// this was just fetched and failed, wait a few minutes
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cb(null, null);
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return;
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}
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if (opts.debug) {
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console.debug("[LEX] certs for '" + hostname + "' are stale on disk and should be will be fetched again");
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console.debug({
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age: now - certInfo.loadedAt
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, loadedAt: certInfo.loadedAt
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, issuedAt: certInfo.issuedAt
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, expiresAt: certInfo.expiresAt
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, privkey: !!certInfo.privkey
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, chain: !!certInfo.chain
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, fullchain: !!certInfo.fullchain
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, cert: !!certInfo.cert
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, memorizeFor: certInfo.memorizeFor
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, failedWait: opts.failedWait
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});
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}
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fetch(hostname, cb);
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};
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};
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