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Fixed filename.
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Ylian Saint-Hilaire
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233
letsencrypt.js
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233
letsencrypt.js
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/**
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* @description MeshCentral letsEncrypt module, uses GreenLock to do all the work.
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* @author Ylian Saint-Hilaire
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* @copyright Intel Corporation 2018-2020
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* @license Apache-2.0
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* @version v0.0.2
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*/
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/*xjslint node: true */
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/*xjslint plusplus: true */
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/*xjslint maxlen: 256 */
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/*jshint node: true */
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/*jshint strict: false */
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/*jshint esversion: 6 */
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'use strict';
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// ACME-Client Implementation
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var globalLetsEncrypt = null;
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module.exports.CreateLetsEncrypt = function (parent) {
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const acme = require('acme-client');
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var obj = {};
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obj.fs = require('fs');
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obj.path = require('path');
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obj.parent = parent;
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obj.forge = obj.parent.certificateOperations.forge;
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obj.leDomains = null;
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obj.challenges = {};
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obj.runAsProduction = false;
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obj.redirWebServerHooked = false;
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obj.configErr = null;
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obj.configOk = false;
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obj.pendingRequest = false;
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// Let's Encrypt debug logging
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obj.log = function (str) {
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parent.debug('cert', 'LE: ' + str);
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var d = new Date();
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obj.events.push(d.toLocaleDateString() + ' ' + d.toLocaleTimeString() + ' - ' + str);
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while (obj.events.length > 200) { obj.events.shift(); } // Keep only 200 last events.
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}
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obj.events = [];
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// Setup the certificate storage paths
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obj.certPath = obj.path.join(obj.parent.datapath, 'letsencrypt-certs');
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try { obj.parent.fs.mkdirSync(obj.certPath); } catch (e) { }
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// Hook up GreenLock to the redirection server
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if (obj.parent.config.settings.rediraliasport === 80) { obj.redirWebServerHooked = true; }
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else if ((obj.parent.config.settings.rediraliasport == null) && (obj.parent.redirserver.port == 80)) { obj.redirWebServerHooked = true; }
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// Deal with HTTP challenges
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function challengeCreateFn(authz, challenge, keyAuthorization) { if (challenge.type === 'http-01') { obj.challenges[challenge.token] = keyAuthorization; } }
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function challengeRemoveFn(authz, challenge, keyAuthorization) { if (challenge.type === 'http-01') { delete obj.challenges[challenge.token]; } }
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obj.challenge = function (token, hostname, func) { if (obj.challenges[token] != null) { obj.log("Succesful response to challenge."); } else { obj.log("Failed to respond to challenge, token: " + token + ", table: " + JSON.stringify(obj.challenges) + "."); } func(obj.challenges[token]); }
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// Get the current certificate
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obj.getCertificate = function(certs, func) {
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obj.runAsProduction = (obj.parent.config.letsencrypt.production === true);
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obj.log("Getting certs from local store (" + (obj.runAsProduction ? "Production" : "Staging") + ")");
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if (certs.CommonName.indexOf('.') == -1) { obj.configErr = "ERROR: Use --cert to setup the default server name before using Let's Encrypt."; obj.log(obj.configErr); console.log(obj.configErr); func(certs); return; }
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if (obj.parent.config.letsencrypt == null) { obj.configErr = "No Let's Encrypt configuration"; obj.log(obj.configErr); console.log(obj.configErr); func(certs); return; }
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if (obj.parent.config.letsencrypt.email == null) { obj.configErr = "ERROR: Let's Encrypt email address not specified."; obj.log(obj.configErr); console.log(obj.configErr); func(certs); return; }
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if ((obj.parent.redirserver == null) || ((typeof obj.parent.config.settings.rediraliasport === 'number') && (obj.parent.config.settings.rediraliasport !== 80)) || ((obj.parent.config.settings.rediraliasport == null) && (obj.parent.redirserver.port !== 80))) { obj.configErr = "ERROR: Redirection web server must be active on port 80 for Let's Encrypt to work."; obj.log(obj.configErr); console.log(obj.configErr); func(certs); return; }
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if (obj.redirWebServerHooked !== true) { obj.configErr = "ERROR: Redirection web server not setup for Let's Encrypt to work."; obj.log(obj.configErr); console.log(obj.configErr); func(certs); return; }
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if ((obj.parent.config.letsencrypt.rsakeysize != null) && (obj.parent.config.letsencrypt.rsakeysize !== 2048) && (obj.parent.config.letsencrypt.rsakeysize !== 3072)) { obj.configErr = "ERROR: Invalid Let's Encrypt certificate key size, must be 2048 or 3072."; obj.log(obj.configErr); console.log(obj.configErr); func(certs); return; }
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if (obj.checkInterval == null) { obj.checkInterval = setInterval(obj.checkRenewCertificate, 86400000); } // Call certificate check every 24 hours.
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obj.configOk = true;
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// Get the list of domains
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obj.leDomains = [ certs.CommonName ];
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if (obj.parent.config.letsencrypt.names != null) {
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if (typeof obj.parent.config.letsencrypt.names == 'string') { obj.parent.config.letsencrypt.names = obj.parent.config.letsencrypt.names.split(','); }
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obj.parent.config.letsencrypt.names.map(function (s) { return s.trim(); }); // Trim each name
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if ((typeof obj.parent.config.letsencrypt.names != 'object') || (obj.parent.config.letsencrypt.names.length == null)) { console.log("ERROR: Let's Encrypt names must be an array in config.json."); func(certs); return; }
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obj.leDomains = obj.parent.config.letsencrypt.names;
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}
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// Read TLS certificate from the configPath
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var certFile = obj.path.join(obj.certPath, (obj.runAsProduction ? 'production.crt' : 'staging.crt'));
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var keyFile = obj.path.join(obj.certPath, (obj.runAsProduction ? 'production.key' : 'staging.key'));
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if (obj.fs.existsSync(certFile) && obj.fs.existsSync(keyFile)) {
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obj.log("Reading certificate files");
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// Read the certificate and private key
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var certPem = obj.fs.readFileSync(certFile).toString('utf8');
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var cert = obj.forge.pki.certificateFromPem(certPem);
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var keyPem = obj.fs.readFileSync(keyFile).toString('utf8');
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var key = obj.forge.pki.privateKeyFromPem(keyPem);
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// Decode the certificate common and alt names
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obj.certNames = [cert.subject.getField('CN').value];
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var altNames = cert.getExtension('subjectAltName');
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if (altNames) { for (i = 0; i < altNames.altNames.length; i++) { var acn = altNames.altNames[i].value.toLowerCase(); if (obj.certNames.indexOf(acn) == -1) { obj.certNames.push(acn); } } }
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// Decode the certificate expire time
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obj.certExpire = cert.validity.notAfter;
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// Use this certificate when possible on any domain
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if (obj.certNames.indexOf(certs.CommonName) >= 0) {
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obj.log("Setting LE cert for default domain.");
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certs.web.cert = certPem;
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certs.web.key = keyPem;
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//certs.web.ca = [results.pems.chain];
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}
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for (var i in obj.parent.config.domains) {
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if ((obj.parent.config.domains[i].dns != null) && (obj.parent.certificateOperations.compareCertificateNames(obj.certNames, obj.parent.config.domains[i].dns))) {
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obj.log("Setting LE cert for domain " + i + ".");
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certs.dns[i].cert = certPem;
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certs.dns[i].key = keyPem;
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//certs.dns[i].ca = [results.pems.chain];
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}
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}
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} else {
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obj.log("No certificate files found");
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}
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func(certs);
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setTimeout(obj.checkRenewCertificate, 5000); // Hold 5 seconds and check if we need to request a certificate.
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}
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// Check if we need to get a new certificate
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// Return 0 = CertOK, 1 = Request:NoCert, 2 = Request:Expire, 3 = Request:MissingNames
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obj.checkRenewCertificate = function () {
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if (obj.pendingRequest == true) { obj.log("Request for certificate is in process."); return 4; }
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if (obj.certNames == null) {
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obj.log("Got no certificates, asking for one now.");
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obj.requestCertificate();
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return 1;
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} else {
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// Look at the existing certificate to see if we need to renew it
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var daysLeft = Math.floor((obj.certExpire - new Date()) / 86400000);
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obj.log("Certificate has " + daysLeft + " day(s) left.");
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if (daysLeft < 45) {
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obj.log("Asking for new certificate because of expire time.");
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obj.requestCertificate();
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return 2;
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} else {
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var missingDomain = false;
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for (var i in obj.leDomains) {
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if (obj.parent.certificateOperations.compareCertificateNames(obj.certNames, obj.leDomains[i]) == false) {
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obj.log("Missing name \"" + obj.leDomains[i] + "\".");
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missingDomain = true;
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}
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}
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if (missingDomain) {
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obj.log("Asking for new certificate because of missing names.");
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obj.requestCertificate();
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return 3;
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} else {
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obj.log("Certificate is ok.");
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}
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}
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}
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return 0;
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}
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obj.requestCertificate = function () {
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if (obj.pendingRequest == true) return;
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if (obj.configOk == false) { obj.log("Can't request cert, invalid configuration.");return; }
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obj.pendingRequest = true;
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// Create a private key
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obj.log("Generating private key...");
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acme.forge.createPrivateKey().then(function (accountKey) {
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// Create the ACME client
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obj.log("Setting up ACME client...");
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obj.client = new acme.Client({
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directoryUrl: obj.runAsProduction ? acme.directory.letsencrypt.production : acme.directory.letsencrypt.staging,
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accountKey: accountKey
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});
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// Create Certificate Request (CSR)
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obj.log("Creating certificate request...");
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acme.forge.createCsr({
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commonName: obj.leDomains[0],
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altNames: obj.leDomains
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}).then(function (r) {
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var csr = r[1];
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obj.tempPrivateKey = r[0];
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obj.log("Requesting certificate from Let's Encrypt...");
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obj.client.auto({
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csr,
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email: obj.parent.config.letsencrypt.email,
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termsOfServiceAgreed: true,
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challengeCreateFn,
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challengeRemoveFn
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}).then(function (cert) {
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obj.log("Got certificate.");
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// Save certificate and private key to PEM files
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var certFile = obj.path.join(obj.certPath, (obj.runAsProduction ? 'production.crt' : 'staging.crt'));
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var keyFile = obj.path.join(obj.certPath, (obj.runAsProduction ? 'production.key' : 'staging.key'));
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obj.fs.writeFileSync(certFile, cert);
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obj.fs.writeFileSync(keyFile, obj.tempPrivateKey);
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delete obj.tempPrivateKey;
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// Cause a server restart
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obj.log("Performing server restart...");
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obj.parent.performServerCertUpdate();
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}, function (err) {
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obj.log("Failed to obtain certificate: " + err.message);
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obj.pendingRequest = false;
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delete obj.client;
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});
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}, function (err) {
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obj.log("Failed to generate certificate request: " + err.message);
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obj.pendingRequest = false;
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delete obj.client;
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});
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}, function (err) {
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obj.log("Failed to generate private key: " + err.message);
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obj.pendingRequest = false;
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delete obj.client;
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});
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}
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// Return the status of this module
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obj.getStats = function () {
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var r = {
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configOk: obj.configOk,
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leDomains: obj.leDomains,
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challenges: obj.challenges,
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production: obj.runAsProduction,
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webServer: obj.redirWebServerHooked,
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certPath: obj.certPath
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};
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if (obj.configErr) { r.error = obj.configErr; }
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if (obj.certExpire) { r.cert = 'Present'; r.daysLeft = Math.floor((obj.certExpire - new Date()) / 86400000); } else { r.cert = 'None'; }
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return r;
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}
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return obj;
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}
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