"use strict"; const base64url = require("base64url"); const child_process = require("child_process"); const crypto = require("crypto"); const fs = require("fs"); const readline = require("readline"); const smartacme_classes_jwebclient_1 = require("./smartacme.classes.jwebclient"); /** * json_to_utf8buffer * @private * @description convert JSON to Buffer using UTF-8 encoding * @param {Object} obj * @return {Buffer} * @throws Exception if object cannot be stringified or contains cycle */ let json_to_utf8buffer = function (obj) { return new Buffer(JSON.stringify(obj), 'utf8'); }; /** * @class AcmeClient * @constructor * @description ACME protocol implementation from client perspective * @param {string} directory_url - Address of directory * @param {module:JWebClient~JWebClient} jWebClient - Reference to JSON-Web-Client */ class AcmeClient { constructor(directoryUrlArg) { /** * @member {Object} module:AcmeClient~AcmeClient#clientProfilePubKey * @desc Cached public key obtained from profile */ this.clientProfilePubKey = {}; /** * @member {number} module:AcmeClient~AcmeClient#days_valid * @desc Validity period in days * @default 1 */ this.days_valid = 1; /** * @member {number} module:AcmeClient~AcmeClient#defaultRsaKeySize * @desc Key strength in bits * @default 4096 */ this.defaultRsaKeySize = 4096; /** * @member {Object} module:AcmeClient~AcmeClient#directory * @desc Hash map of REST URIs */ this.directory = {}; /** * @member {string} module:AcmeClient~AcmeClient#directory_url * @desc Address of directory */ this.directoryUrl = directoryUrlArg; /** * @member {string} module:AcmeClient~AcmeClient#emailDefaultPrefix * @desc Prefix of email address if constructed from domain name * @default "hostmaster" */ this.emailDefaultPrefix = 'hostmaster'; // {string} /** * @member {string} module:AcmeClient~AcmeClient#emailOverride * @desc Email address to use */ this.emailOverride = null; // {string} /** * @member {module:JWebClient~JWebClient} module:AcmeClient~AcmeClient#jWebClient * @desc Reference to JSON-Web-Client */ this.jWebClient = new smartacme_classes_jwebclient_1.JWebClient(); // {JWebClient} /** * @member {string} module:AcmeClient~AcmeClient#regLink * @desc Cached registration URI */ this.regLink = null; // {string} /** * @member {string} module:AcmeClient~AcmeClient#tosLink * @desc Cached terms of service URI */ this.tosLink = null; // {string} /** * @member {string} module:AcmeClient~AcmeClient#webroot * @desc Path to server web root (or path to store challenge data) * @default "." */ this.webroot = '.'; // {string} /** * @member {string} module:AcmeClient~AcmeClient#well_known_path * @desc Directory structure for challenge data * @default "/.well-known/acme-challenge/" */ this.well_known_path = '/.well-known/acme-challenge/'; // {string} /** * @member {boolean} module:AcmeClient~AcmeClient#withInteraction * @desc Determines if interaction of user is required * @default true */ this.withInteraction = true; // {boolean} } // ***************************************************************************** // REQUEST-Section // ***************************************************************************** /** * getDirectory * @description retrieve directory entries (directory url must be set prior to execution) * @param {function} callback - first argument will be the answer object */ getDirectory(callback) { this.jWebClient.get(this.directoryUrl, callback, callback); // dereference callback = null; } /** * newRegistration * @description try to register (directory lookup must have occured prior to execution) * @param {Object} payload * @param {function} callback - first argument will be the answer object */ newRegistration(payload, callback) { if (!(payload instanceof Object)) { payload = {}; // ensure payload is object } payload.resource = 'new-reg'; this.jWebClient.post(this.directory['new-reg'], payload, callback, callback); // dereference callback = null; payload = null; } /** * getRegistration * @description get information about registration * @param {string} uri - will be exposed when trying to register * @param {Object} payload - update information * @param {function} callback - first argument will be the answer object */ getRegistration(uri, payload, callback) { /*jshint -W069 */ let ctx = this; if (!(payload instanceof Object)) { payload = {}; // ensure payload is object } payload['resource'] = 'reg'; if (typeof callback !== 'function') { callback = this.emptyCallback; // ensure callback is function } this.jWebClient.post(uri, payload, function (ans, res) { if (ans instanceof Object) { ctx.clientProfilePubKey = ans.key; // cache or reset returned public key if ((res instanceof Object) && (res['headers'] instanceof Object)) { let linkStr = res.headers['link']; if (typeof linkStr === 'string') { let tosLink = ctx.getTosLink(linkStr); if (typeof tosLink === 'string') { ctx.tosLink = tosLink; // cache TOS link } else { ctx.tosLink = null; // reset TOS link } } else { ctx.tosLink = null; // reset TOS link } } else { ctx.tosLink = null; // reset TOS link } callback(ans, res); } else { callback(false); } // dereference ans = null; callback = null; ctx = null; res = null; }); // dereference payload = null; } /** * authorizeDomain * @description authorize domain using challenge-response-method * @param {string} domain * @param {function} callback - first argument will be the answer object */ authorizeDomain(domain, callback) { /*jshint -W069 */ let ctx = this; if (typeof callback !== 'function') { callback = this.emptyCallback; // ensure callback is function } this.getProfile(function (profile) { if (!(profile instanceof Object)) { callback(false); // no profile returned // dereference callback = null; ctx = null; } else { ctx.jWebClient.post(ctx.directory['new-authz'], ctx.makeDomainAuthorizationRequest(domain), function (ans, res) { if ((res instanceof Object) && (res['statusCode'] === 403)) { ctx.agreeTos(ctx.tosLink, function (ans_, res_) { if ((res_ instanceof Object) && (res_['statusCode'] >= 200) && (res_['statusCode'] <= 400)) { ctx.authorizeDomain(domain, callback); // try authorization again } else { callback(false); // agreement failed } // dereference ans = null; ans_ = null; callback = null; ctx = null; profile = null; res = null; res_ = null; }); } else { if ((res instanceof Object) && (res['headers'] instanceof Object) && (typeof res.headers['location'] === 'string') && (ans instanceof Object)) { let poll_uri = res.headers['location']; // status URI for polling let challenge = ctx.selectChallenge(ans, 'http-01'); // select simple http challenge if (challenge instanceof Object) { ctx.prepareChallenge(domain, challenge, function () { // reset ans = null; res = null; // accept challenge ctx.acceptChallenge(challenge, function (ans, res) { if ((res instanceof Object) && (res['statusCode'] < 400) // server confirms challenge acceptance ) { ctx.pollUntilValid(poll_uri, callback); // poll status until server states success } else { callback(false); // server did not confirm challenge acceptance } // dereference ans = null; callback = null; challenge = null; ctx = null; profile = null; res = null; }); }); } else { callback(false); // desired challenge is not in list // dereference ans = null; callback = null; ctx = null; profile = null; res = null; } } else { callback(false); // server did not respond with status URI // dereference ans = null; callback = null; ctx = null; profile = null; res = null; } } }); } }); } /** * acceptChallenge * @description tell server which challenge will be accepted * @param {Object} challenge * @param {function} callback - first argument will be the answer object */ acceptChallenge(challenge, callback) { /*jshint -W069 */ if (!(challenge instanceof Object)) { challenge = {}; // ensure challenge is object } this.jWebClient.post(challenge['uri'], this.makeChallengeResponse(challenge), callback); // dereference callback = null; challenge = null; } /** * pollUntilValid * @description periodically (with exponential back-off) check status of challenge * @param {string} uri * @param {function} callback - first argument will be the answer object * @param {number} retry - factor of delay */ pollUntilValid(uri, callback, retry = 1) { /*jshint -W069 */ let ctx = this; if (typeof callback !== 'function') { callback = this.emptyCallback; // ensure callback is function } if (retry > 128) { callback(false); // stop if retry value exceeds maximum } else { this.jWebClient.get(uri, function (ans, res) { if (!(ans instanceof Object)) { callback(false); // invalid answer // dereference callback = null; ctx = null; res = null; } else { if (ans['status'] === 'pending') { setTimeout(function () { ctx.pollUntilValid(uri, callback, retry * 2); // retry // dereference ans = null; callback = null; ctx = null; res = null; }, retry * 500); } else { callback(ans, res); // challenge complete // dereference ans = null; callback = null; ctx = null; res = null; } } }); } } /** * pollUntilIssued * @description periodically (with exponential back-off) check status of CSR * @param {string} uri * @param {function} callback - first argument will be the answer object * @param {number} retry - factor of delay */ pollUntilIssued(uri, callback, retry = 1) { /*jshint -W069 */ let ctx = this; if (typeof callback !== 'function') { callback = this.emptyCallback; // ensure callback is function } if (retry > 128) { callback(false); // stop if retry value exceeds maximum } else { this.jWebClient.get(uri, function (ans, res) { if ((ans instanceof Buffer) && (ans.length > 0)) { callback(ans); // certificate was returned with answer // dereference ans = null; callback = null; ctx = null; res = null; } else { if ((res instanceof Object) && (res['statusCode'] < 400)) { setTimeout(function () { ctx.pollUntilIssued(uri, callback, retry * 2); // retry // dereference ans = null; callback = null; ctx = null; res = null; }, retry * 500); } else { callback(false); // CSR complete // dereference ans = null; callback = null; ctx = null; res = null; } } }); } } /** * requestSigning * @description send CSR * @param {string} domain - expected to be already sanitized * @param {function} callback - first argument will be the answer object */ requestSigning(domain, callback) { /*jshint -W069 */ let ctx = this; if (typeof callback !== 'function') { callback = this.emptyCallback; // ensure callback is function } fs.readFile(domain + '.csr', function (err, csr) { if (err instanceof Object) { if (ctx.jWebClient.verbose) { console.error('Error : File system error', err['code'], 'while reading key from file'); } callback(false); // dereference callback = null; csr = null; ctx = null; err = null; } else { ctx.jWebClient.post(ctx.directory['new-cert'], ctx.makeCertRequest(csr, ctx.days_valid), function (ans, res) { if ((ans instanceof Buffer) && (ans.length > 0)) { callback(ans); // certificate was returned with answer // dereference ans = null; callback = null; csr = null; ctx = null; err = null; res = null; } else { if (res instanceof Object) { if ((res['statusCode'] < 400) && !ans) { let headers = res['headers']; if (!(headers instanceof Object)) { headers = {}; // ensure headers is object } ctx.pollUntilIssued(headers['location'], callback); // poll provided status URI // dereference headers = null; } else { callback((res['statusCode'] < 400) ? ans : false); // answer may be provided as string or object } } else { callback(false); // invalid response } // dereference ans = null; callback = null; csr = null; ctx = null; err = null; res = null; } }); } }); } /** * getProfile * @description retrieve profile of user (will make directory lookup and registration check) * @param {function} callback - first argument will be the answer object */ getProfile(callback) { /*jshint -W069 */ let ctx = this; if (typeof callback !== 'function') { callback = this.emptyCallback; // ensure callback is function } this.getDirectory(function (dir) { if (!(dir instanceof Object)) { callback(false); // server did not respond with directory // dereference callback = null; ctx = null; } else { ctx.directory = dir; // cache directory ctx.newRegistration(null, function (ans, res) { if ((res instanceof Object) && (res['headers'] instanceof Object) && (typeof res.headers['location'] === 'string')) { ctx.regLink = res.headers['location']; ctx.getRegistration(ctx.regLink, null, callback); // get registration info from link } else { callback(false); // registration failed } // dereference ans = null; callback = null; ctx = null; dir = null; res = null; }); } }); } /** * createAccount * @description create new account (assumes directory lookup has already occured) * @param {string} email * @param {function} callback - first argument will be the registration URI */ createAccount(email, callback) { /*jshint -W069 */ let ctx = this; if (typeof email === 'string') { if (typeof callback !== 'function') { callback = this.emptyCallback; // ensure callback is function } ctx.newRegistration({ contact: [ 'mailto:' + email ] }, function (ans, res) { if ((res instanceof Object) && (res['statusCode'] === 201) && (res['headers'] instanceof Object) && (typeof res.headers['location'] === 'string')) { ctx.regLink = res.headers['location']; callback(ctx.regLink); // registration URI } else { callback(false); // registration failed } // dereference ans = null; callback = null; ctx = null; res = null; }); } else { callback(false); // no email address provided // dereference callback = null; ctx = null; } } /** * agreeTos * @description agree with terms of service (update agreement status in profile) * @param {string} tosLink * @param {function} callback - first argument will be the answer object */ agreeTos(tosLink, callback) { this.getRegistration(this.regLink, { 'Agreement': tosLink // terms of service URI }, callback); // dereference callback = null; } /** * Entry-Point: Request certificate * @param {string} domain * @param {string} organization * @param {string} country * @param {function} callback */ requestCertificate(domain, organization, country, callback) { /*jshint -W069 */ let ctx = this; if (typeof domain !== 'string') { domain = ''; // ensure domain is string } if (typeof callback !== 'function') { callback = this.emptyCallback; // ensure callback is function } this.getProfile(function (profile) { let email = ctx.extractEmail(profile); // try to determine email address from profile if (typeof ctx.emailOverride === 'string') { email = ctx.emailOverride; // override email address if set } else if (typeof email !== 'string') { email = ctx.emailDefaultPrefix + '@' + domain; // or set default } let bit = ctx.defaultRsaKeySize; // sanitize bit = Number(bit); country = ctx.makeSafeFileName(country); domain = ctx.makeSafeFileName(domain); email = ctx.makeSafeFileName(email); organization = ctx.makeSafeFileName(organization); // create key pair ctx.createKeyPair(bit, country, organization, domain, email, function (e) { if (!e) { ctx.requestSigning(domain, function (cert) { if ((cert instanceof Buffer) || (typeof cert === 'string')) { fs.writeFile(domain + '.der', cert, function (err) { if (err instanceof Object) { if (ctx.jWebClient.verbose) { console.error('Error : File system error', err['code'], 'while writing certificate to file'); } callback(false); } else { callback(true); // CSR complete and certificate written to file system } // dereference callback = null; cert = null; ctx = null; e = null; err = null; profile = null; }); } else { callback(false); // invalid certificate data // dereference callback = null; cert = null; ctx = null; e = null; profile = null; } }); } else { callback(false); // could not create key pair // dereference callback = null; ctx = null; e = null; profile = null; } }); }); } /** * External: Create key pair * @param {number} bit - key strength, expected to be already sanitized * @param {string} c - country code, expected to be already sanitized * @param {string} o - organization, expected to be already sanitized * @param {string} cn - common name (domain name), expected to be already sanitized * @param {string} e - email address, expected to be already sanitized * @param {function} callback */ createKeyPair(bit, c, o, cn, e, callback) { if (typeof callback !== 'function') { callback = this.emptyCallback; // ensure callback is function } let openssl = `openssl req -new -nodes -newkey rsa:${bit} -sha256 -subj "/C=${c}/O=${o}/CN=${cn}/emailAddress=${e}" -keyout \"${cn}.key\" -outform der -out \"${cn}.csr\"`; console.error('Action : Creating key pair'); if (this.jWebClient.verbose) { console.error('Running:', openssl); } child_process.exec(openssl, function (e) { if (!e) { console.error('Result : done'); } else { console.error('Result : failed'); } callback(e); // dereference callback = null; e = null; }); } /** * Helper: Empty callback */ emptyCallback() { // nop } /** * Helper: Make safe file name or path from string * @param {string} name * @param {boolean} withPath - optional, default false * @return {string} */ makeSafeFileName(name, withPath = false) { if (typeof name !== 'string') { name = ''; } // respects file name restrictions for ntfs and ext2 let regex_file = '[<>:\"/\\\\\\|\\?\\*\\u0000-\\u001f\\u007f\\u0080-\\u009f]'; let regex_path = '[<>:\"\\\\\\|\\?\\*\\u0000-\\u001f\\u007f\\u0080-\\u009f]'; return name.replace(new RegExp(withPath ? regex_path : regex_file, 'g'), function (charToReplace) { if (typeof charToReplace === 'string') { return '%' + charToReplace.charCodeAt(0).toString(16).toLocaleUpperCase(); } return '%00'; }); } /** * Helper: Prepare challenge * @param {string} domain * @param {Object} challenge * @param {function} callback */ prepareChallenge(domain, challenge, callback) { /*jshint -W069, unused:false*/ let ctx = this; if (typeof callback !== 'function') { callback = this.emptyCallback; // ensure callback is function } if (challenge instanceof Object) { if (challenge['type'] === 'http-01') { let path = this.webroot + this.well_known_path + challenge['token']; // webroot and well_known_path are expected to be already sanitized fs.writeFile(path, this.makeKeyAuthorization(challenge), function (err) { if (err instanceof Object) { if (ctx.jWebClient.verbose) { console.error('Error : File system error', err['code'], 'while writing challenge data to file'); } callback(); // dereference callback = null; challenge = null; ctx = null; err = null; } else { // let uri = "http://" + domain + this.well_known_path + challenge["token"] let rl = readline.createInterface(process.stdin, process.stdout); if (ctx.withInteraction) { rl.question('Press enter to proceed', function (answer) { rl.close(); callback(); // dereference callback = null; challenge = null; ctx = null; rl = null; }); } else { rl.close(); callback(); // skip interaction prompt if desired // dereference callback = null; challenge = null; ctx = null; rl = null; } } }); } else { console.error('Error : Challenge not supported'); callback(); // dereference callback = null; challenge = null; ctx = null; } } else { console.error('Error : Invalid challenge response'); callback(); // dereference callback = null; challenge = null; ctx = null; } } /** * Helper: Extract TOS Link, e.g. from "<http://...>;rel="terms-of-service" * @param {string} linkStr * @return {string} */ getTosLink(linkStr) { let match = /(<)([^>]+)(>;rel="terms-of-service")/g.exec(linkStr); if ((match instanceof Array) && (match.length > 2)) { let result = match[2]; // dereference match = null; return result; } // dereference match = null; return void 0; } /** * Helper: Select challenge by type * @param {Object} ans * @param {string} challenge_type * @return {Object} */ selectChallenge(ans, challengeType) { /*jshint -W069 */ if ((ans instanceof Object) && (ans['challenges'] instanceof Array)) { return ans.challenges.filter(function (entry) { let type = entry['type']; // dereference entry = null; if (type === challengeType) { return true; } return false; }).pop(); } // return first match or undefined // dereference ans = null; return void 0; // challenges not available or in expected format } /** * Helper: Extract first found email from profile (without mailto prefix) * @param {Object} profile * @return {string} */ extractEmail(profile) { /*jshint -W069 */ if (!(profile instanceof Object) || !(profile['contact'] instanceof Array)) { // dereference profile = null; return void 0; // invalid profile } let prefix = 'mailto:'; let email = profile.contact.filter(function (entry) { if (typeof entry !== 'string') { return false; } else { return !entry.indexOf(prefix); // check for mail prefix } }).pop(); // dereference profile = null; if (typeof email !== 'string') { return void 0; } // return default return email.substr(prefix.length); // only return email address without protocol prefix } /** * Make ACME-Request: Domain-Authorization Request - Object: resource, identifier * @param {string} domain * @return {{resource: string, identifier: Object}} */ makeDomainAuthorizationRequest(domain) { return { 'resource': 'new-authz', 'identifier': { 'type': 'dns', 'value': domain } }; } /** * Make ACME-Object: Key-Authorization (encoded) - String: Challenge-Token . Encoded-Account-Key-Hash * @param {Object} challenge * @return {string} */ makeKeyAuthorization(challenge) { /*jshint -W069 */ if (challenge instanceof Object) { if (this.clientProfilePubKey instanceof Object) { let jwk = json_to_utf8buffer({ e: this.clientProfilePubKey['e'], kty: this.clientProfilePubKey['kty'], n: this.clientProfilePubKey['n'] }); let hash = crypto.createHash('sha256').update(jwk.toString('utf8'), 'utf8').digest(); let ACCOUNT_KEY = base64url.default.encode(hash); // create base64 encoded hash of account key let token = challenge['token']; // dereference challenge = null; jwk = null; return token + '.' + ACCOUNT_KEY; } } else { return ''; // return default (for writing to file) } } /** * Make ACME-Request: Challenge-Response - Object: resource, keyAuthorization * @param {Object} challenge * @return {{resource: string, keyAuthorization: string}} */ makeChallengeResponse(challenge) { return { 'resource': 'challenge', 'keyAuthorization': this.makeKeyAuthorization(challenge) }; } /** * Make ACME-Request: CSR - Object: resource, csr, notBefore, notAfter * @param {string} csr * @param {number} days_valid * @return {{resource: string, csr: string, notBefore: string, notAfter: string}} */ makeCertRequest(csr, DAYS_VALID) { if (typeof csr !== 'string' && !(csr instanceof Buffer)) { csr = ''; // default string for CSR } if ((typeof DAYS_VALID !== 'number') || (isNaN(DAYS_VALID)) || (DAYS_VALID === 0)) { DAYS_VALID = 1; // default validity duration (1 day) } let DOMAIN_CSR_DER = base64url.default.encode(csr); // create base64 encoded CSR let CURRENT_DATE = (new Date()).toISOString(); // set start date to current date // set end date to current date + days_valid let NOTAFTER_DATE = (new Date((+new Date()) + 1000 * 60 * 60 * 24 * Math.abs(DAYS_VALID))).toISOString(); return { 'resource': 'new-cert', 'csr': DOMAIN_CSR_DER, 'notBefore': CURRENT_DATE, 'notAfter': NOTAFTER_DATE }; } } exports.AcmeClient = AcmeClient; //# 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