smartacme/dist/smartacme.classes.acmeclient.js
2016-11-01 18:27:57 +01:00

903 lines
65 KiB
JavaScript

"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 "&lt;http://...&gt;;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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