enigma-bbs/core/exodus.js

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/* jslint node: true */
'use strict';
// ENiGMA½
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const MenuModule = require('./menu_module.js').MenuModule;
const resetScreen = require('./ansi_term.js').resetScreen;
const Config = require('./config.js').get;
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const Errors = require('./enig_error.js').Errors;
const Log = require('./logger.js').log;
const getEnigmaUserAgent = require('./misc_util.js').getEnigmaUserAgent;
// deps
const async = require('async');
const _ = require('lodash');
const joinPath = require('path').join;
const crypto = require('crypto');
const moment = require('moment');
const https = require('https');
const querystring = require('querystring');
const fs = require('fs');
const SSHClient = require('ssh2').Client;
/*
Configuration block:
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someDoor: {
module: exodus
config: {
// defaults
ticketHost: oddnetwork.org
ticketPort: 1984
ticketPath: /exodus
rejectUnauthorized: false // set to true to allow untrusted CA's (dangerous!)
sshHost: oddnetwork.org
sshPort: 22
sshUser: exodus
sshKeyPem: /path/to/enigma-bbs/misc/exodus.id_rsa
// optional
caPem: /path/to/cacerts.pem // see https://curl.haxx.se/docs/caextract.html
// required
board: XXXX
key: XXXX
door: some_door
}
}
*/
exports.moduleInfo = {
name : 'Exodus',
desc : 'Exodus Door Server Access Module - https://oddnetwork.org/exodus/',
author : 'NuSkooler',
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};
exports.getModule = class ExodusModule extends MenuModule {
constructor(options) {
super(options);
this.config = options.menuConfig.config || {};
this.config.ticketHost = this.config.ticketHost || 'oddnetwork.org';
this.config.ticketPort = this.config.ticketPort || 1984,
this.config.ticketPath = this.config.ticketPath || '/exodus';
this.config.rejectUnauthorized = _.get(this.config, 'rejectUnauthorized', true);
this.config.sshHost = this.config.sshHost || this.config.ticketHost;
this.config.sshPort = this.config.sshPort || 22;
this.config.sshUser = this.config.sshUser || 'exodus_server';
this.config.sshKeyPem = this.config.sshKeyPem || joinPath(Config().paths.misc, 'exodus.id_rsa');
}
initSequence() {
const self = this;
let clientTerminated = false;
async.waterfall(
[
function validateConfig(callback) {
// very basic validation on optionals
async.each( [ 'board', 'key', 'door' ], (key, next) => {
return _.isString(self.config[key]) ? next(null) : next(Errors.MissingConfig(`Config requires "${key}"!`));
}, callback);
},
function loadCertAuthorities(callback) {
if(!_.isString(self.config.caPem)) {
return callback(null, null);
}
fs.readFile(self.config.caPem, (err, certAuthorities) => {
return callback(err, certAuthorities);
});
},
function getTicket(certAuthorities, callback) {
const now = moment.utc().unix();
const sha256 = crypto.createHash('sha256').update(`${self.config.key}${now}`).digest('hex');
const token = `${sha256}|${now}`;
const postData = querystring.stringify({
token : token,
board : self.config.board,
user : self.client.user.username,
door : self.config.door,
});
const reqOptions = {
hostname : self.config.ticketHost,
port : self.config.ticketPort,
path : self.config.ticketPath,
rejectUnauthorized : self.config.rejectUnauthorized,
method : 'POST',
headers : {
'Content-Type' : 'application/x-www-form-urlencoded',
'Content-Length' : postData.length,
'User-Agent' : getEnigmaUserAgent(),
}
};
if(certAuthorities) {
reqOptions.ca = certAuthorities;
}
let ticket = '';
const req = https.request(reqOptions, res => {
res.on('data', data => {
ticket += data;
});
res.on('end', () => {
if(ticket.length !== 36) {
return callback(Errors.Invalid(`Invalid Exodus ticket: ${ticket}`));
}
return callback(null, ticket);
});
});
req.on('error', err => {
return callback(Errors.General(`Exodus error: ${err.message}`));
});
req.write(postData);
req.end();
},
function loadPrivateKey(ticket, callback) {
fs.readFile(self.config.sshKeyPem, (err, privateKey) => {
return callback(err, ticket, privateKey);
});
},
function establishSecureConnection(ticket, privateKey, callback) {
let pipeRestored = false;
let pipedStream;
function restorePipe() {
if(pipedStream && !pipeRestored && !clientTerminated) {
self.client.term.output.unpipe(pipedStream);
self.client.term.output.resume();
}
}
self.client.term.write(resetScreen());
self.client.term.write('Connecting to Exodus server, please wait...\n');
const sshClient = new SSHClient();
const window = {
rows : self.client.term.termHeight,
cols : self.client.term.termWidth,
width : 0,
height : 0,
term : 'vt100', // Want to pass |self.client.term.termClient| here, but we end up getting hung up on :(
};
const options = {
env : {
exodus : ticket,
},
};
sshClient.on('ready', () => {
self.client.once('end', () => {
self.client.log.info('Connection ended. Terminating Exodus connection');
clientTerminated = true;
return sshClient.end();
});
sshClient.shell(window, options, (err, stream) => {
pipedStream = stream; // :TODO: ewwwwwwwww hack
self.client.term.output.pipe(stream);
stream.on('data', d => {
return self.client.term.rawWrite(d);
});
stream.on('close', () => {
restorePipe();
return sshClient.end();
});
stream.on('error', err => {
Log.warn( { error : err.message }, 'Exodus SSH client stream error');
});
});
});
sshClient.on('close', () => {
restorePipe();
return callback(null);
});
sshClient.connect({
host : self.config.sshHost,
port : self.config.sshPort,
username : self.config.sshUser,
privateKey : privateKey,
});
}
],
err => {
if(err) {
self.client.log.warn( { error : err.message }, 'Exodus error');
}
if(!clientTerminated) {
self.prevMenu();
}
}
);
}
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};