115 lines
3.1 KiB
JavaScript
115 lines
3.1 KiB
JavaScript
'use strict';
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// opts = { notBefore, notAfter, renew, register, httpsOptions }
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module.exports.create = function (opts) {
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if (!opts.notBefore) { throw new Error("must supply options.notBefore (and options.notAfter)"); }
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if (!opts.notAfter) { opts.notAfter = opts.notBefore - (3 * 24 * 60 * 60 * 1000); }
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if (!opts.httpsOptions) { opts.httpOptions = {}; }
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//opts.renewWithin = opts.notBefore; // i.e. 15 days
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opts.renewWindow = opts.notBefore - opts.notAfter; // i.e. 1 day
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//opts.renewRatio = opts.notBefore = opts.renewWindow; // i.e. 1/15 (6.67%)
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var tls = require('tls');
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var snicb = {
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// in-process cache
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_ipc: {}
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// just to account for clock skew
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, _fiveMin: 5 * 60 * 1000
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// cache and format incoming certs
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, cacheCerts: function (certs) {
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var meta = {
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certs: certs
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, tlsContext: tls.createSecureContext({
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key: certs.privkey
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, cert: certs.cert + certs.chain
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, rejectUnauthorized: opts.httpsOptions.rejectUnauthorized
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, requestCert: opts.httpsOptions.requestCert // request peer verification
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, ca: opts.httpsOptions.ca // this chain is for incoming peer connctions
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, crl: opts.httpsOptions.crl // this crl is for incoming peer connections
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})
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, subject: certs.subject
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// stagger renewal time by a little bit of randomness
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, renewAt: (certs.expiresAt - (opts.notBefore - (opts.renewWindow * Math.random())))
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// err just barely on the side of safety
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, expiresNear: certs.expiresAt - snicb._fiveMin
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};
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certs.altnames.forEach(function (domain) {
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snicb._ipc[domain] = { subject: certs.subject };
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});
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snicb._ipc[certs.subject] = meta;
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return meta;
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}
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// automate certificate registration on request
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, sniCallback: function (domain, cb) {
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var certMeta = snicb._ipc[domain];
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var promise;
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var now = Date.now();
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if (certMeta && certMeta.subject !== domain) {
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certMeta = snicb._ipc[domain];
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}
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if (!certMeta) {
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// we don't have a cert and must get one
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promise = opts.register(domain);
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}
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else if (now >= certMeta.expiresNear) {
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// we have a cert, but it's no good for the average user
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promise = opts.renew(domain, certMeta.certs);
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} else {
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// we could stand to try to renew the cert
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if (now >= certMeta.renewAt) {
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// give the cert some time to be validated and replaced before trying again
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certMeta.renewAt = Date.now() + (2 * 60 * 60 * 1000) + (3 * 60 * 60 * 1000 * Math.random());
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// let the update happen in the background
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opts.renew(domain, certMeta.certs).then(snicb.cacheCerts);
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}
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// return the valid cert right away
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cb(null, certMeta.certs);
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return;
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}
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// promise the non-existent or expired cert
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promise.then(snicb.cacheCerts).then(function (certMeta) {
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cb(null, certMeta.tlsContext);
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}, cb);
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}
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};
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return snicb;
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};
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