enigma-bbs/core/servers/ssh.js

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/* jslint node: true */
'use strict';
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// ENiGMA½
var Config = require('../config.js').config;
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var baseClient = require('../client.js');
var Log = require('../logger.js').log;
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var ServerModule = require('../server_module.js').ServerModule;
var userLogin = require('../user_login.js').userLogin;
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var enigVersion = require('../../package.json').version;
var theme = require('../theme.js');
var ssh2 = require('ssh2');
var fs = require('fs');
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var util = require('util');
var _ = require('lodash');
var assert = require('assert');
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exports.moduleInfo = {
name : 'SSH',
desc : 'SSH Server',
author : 'NuSkooler',
isSecure : true,
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};
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exports.getModule = SSHServerModule;
function SSHClient(clientConn) {
baseClient.Client.apply(this, arguments);
//
// WARNING: Until we have emit 'ready', self.input, and self.output and
// not yet defined!
//
var self = this;
var loginAttempts = 0;
clientConn.on('authentication', function authAttempt(ctx) {
var username = ctx.username || '';
var password = ctx.password || '';
self.isNewUser = (Config.users.newUserNames || []).indexOf(username) > -1;
self.log.trace( { method : ctx.method, username : username, newUser : self.isNewUser }, 'SSH authentication attempt');
function termConnection() {
ctx.reject();
clientConn.end();
}
//
// If the system is open and |isNewUser| is true, the login
// sequence is hijacked in order to start the applicaiton process.
//
if(false === Config.general.closedSystem && self.isNewUser) {
return ctx.accept();
}
if(username.length > 0 && password.length > 0) {
loginAttempts += 1;
userLogin(self, ctx.username, ctx.password, function authResult(err) {
if(err) {
if(err.existingConn) {
// :TODO: Can we display somthing here?
termConnection();
return;
} else {
return ctx.reject(SSHClient.ValidAuthMethods);
}
} else {
ctx.accept();
}
});
} else {
if(-1 === SSHClient.ValidAuthMethods.indexOf(ctx.method)) {
return ctx.reject(SSHClient.ValidAuthMethods);
}
if(0 === username.length) {
// :TODO: can we display something here?
return ctx.reject();
}
var interactivePrompt = { prompt: ctx.username + '\'s password: ', echo : false };
ctx.prompt(interactivePrompt, function retryPrompt(answers) {
loginAttempts += 1;
userLogin(self, username, (answers[0] || ''), function authResult(err) {
if(err) {
if(err.existingConn) {
// :TODO: can we display something here?
termConnection();
} else {
if(loginAttempts >= Config.general.loginAttempts) {
termConnection();
} else {
var artOpts = {
client : self,
name : 'SSHPMPT.ASC',
readSauce : false,
};
theme.getThemeArt(artOpts, function gotArt(err, artInfo) {
if(err) {
interactivePrompt.prompt = 'Access denied\n' + ctx.username + '\'s password: ';
} else {
var newUserNameList = '"' + (Config.users.newUserNames || []).join(', ') + '"';
interactivePrompt.prompt =
'Access denied\n' +
artInfo.data.format( { newUserNames : newUserNameList } ) +
'\n' + ctx.username + '\'s password: ';
}
return ctx.prompt(interactivePrompt, retryPrompt);
});
}
}
} else {
ctx.accept();
}
});
});
}
});
this.updateTermInfo = function(info) {
//
// From ssh2 docs:
// "rows and cols override width and height when rows and cols are non-zero."
//
var termHeight;
var termWidth;
if(info.rows > 0 && info.cols > 0) {
termHeight = info.rows;
termWidth = info.cols;
} else if(info.width > 0 && info.height > 0) {
termHeight = info.height;
termWidth = info.width;
}
assert(_.isObject(self.term));
//
// Note that if we fail here, connect.js attempts some non-standard
// queries/etc., and ultimately will default to 80x24 if all else fails
//
if(termHeight > 0 && termWidth > 0) {
self.term.termHeight = termHeight;
self.term.termWidth = termWidth;
}
if(_.isString(info.term) && info.term.length > 0 && 'unknown' === self.term.termType) {
self.setTermType(info.term);
}
};
clientConn.once('ready', function clientReady() {
self.log.info('SSH authentication success');
clientConn.on('session', function sess(accept, reject) {
var session = accept();
session.on('pty', function pty(accept, reject, info) {
self.log.debug(info, 'SSH pty event');
if(_.isFunction(accept)) {
accept();
}
if(self.input) { // do we have I/O?
self.updateTermInfo(info);
} else {
self.cachedPtyInfo = info;
}
});
session.on('shell', function shell(accept, reject) {
self.log.debug('SSH shell event');
var channel = accept();
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self.setInputOutput(channel.stdin, channel.stdout);
channel.stdin.on('data', function clientData(data) {
self.emit('data', data);
});
if(self.cachedPtyInfo) {
self.updateTermInfo(self.cachedPtyInfo);
delete self.cachedPtyInfo;
}
// we're ready!
var firstMenu = self.isNewUser ? Config.servers.ssh.firstMenuNewUser : Config.servers.ssh.firstMenu;
self.emit('ready', { firstMenu : firstMenu } );
});
session.on('window-change', function windowChange(accept, reject, info) {
self.log.debug(info, 'SSH window-change event');
console.log('window-change: ' + accept)
self.updateTermInfo(info);
});
});
});
clientConn.on('end', function clientEnd() {
self.emit('end'); // remove client connection/tracking
});
clientConn.on('error', function connError(err) {
self.log.warn( { error : err.toString(), code : err.code }, 'SSH connection error');
});
}
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util.inherits(SSHClient, baseClient.Client);
SSHClient.ValidAuthMethods = [ 'password', 'keyboard-interactive' ];
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function SSHServerModule() {
ServerModule.call(this);
}
util.inherits(SSHServerModule, ServerModule);
SSHServerModule.prototype.createServer = function() {
SSHServerModule.super_.prototype.createServer.call(this);
var serverConf = {
privateKey : fs.readFileSync(Config.servers.ssh.privateKeyPem),
passphrase : Config.servers.ssh.privateKeyPass,
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ident : 'enigma-bbs-' + enigVersion + '-srv',
// Note that sending 'banner' breaks at least EtherTerm!
debug : function debugSsh(dbgLine) {
if(true === Config.servers.ssh.traceConnections) {
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Log.trace('SSH: ' + dbgLine);
}
},
};
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var server = ssh2.Server(serverConf);
server.on('connection', function onConnection(conn, info) {
Log.info(info, 'New SSH connection');
var client = new SSHClient(conn);
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this.emit('client', client, conn._sock);
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});
return server;
};