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smtp.js
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smtp.js
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'use strict';
// Simple SMTP server that accepts all messages for valid recipients
const config = require('wild-config');
const log = require('npmlog');
const SMTPServer = require('smtp-server').SMTPServer;
const tools = require('wildduck/lib/tools');
const db = require('./lib/db');
const fs = require('fs');
const net = require('net');
const EtherealId = require('ethereal-id');
const etherealId = new EtherealId({
secret: config.smtp.msgidSecret,
hash: config.smtp.msgidHash
});
const serverOptions = {
// log to console
logger: {
info(...args) {
args.shift();
log.info('SMTP', ...args);
},
debug(...args) {
args.shift();
log.silly('SMTP', ...args);
},
error(...args) {
args.shift();
log.error('SMTP', ...args);
}
},
name: config.smtp.name,
// not required but nice-to-have
banner: config.smtp.banner,
useProxy: config.smtp.proxy,
disabledCommands: [],
onConnect(session, callback) {
let type = net.isIPv6(session.remoteAddress) ? 'ipv6' : 'ipv4';
db.redis.incr('msa:count:connect:' + type, () => false);
callback();
},
onAuth(auth, session, callback) {
db.userHandler.authenticate(
auth.username,
auth.password,
'smtp',
{
protocol: 'SMTP',
ip: session.remoteAddress
},
(err, result) => {
if (err) {
return callback(err);
}
//if (!result || (result.scope === 'master' && result.require2fa)) {
if (!result) {
err = new Error('Authentication failed');
err.responseCode = 535;
err.name = 'SMTPResponse'; // do not throw
db.redis.incr('msa:count:authfail', () => false);
return callback(err);
}
db.redis.incr('msa:count:authsuccess', () => false);
callback(null, { user: result.user });
}
);
},
onMailFrom(address, session, callback) {
// accept alls sender addresses
return callback();
},
// Validate RCPT TO envelope address. Example allows all addresses that do not start with 'deny'
// If this method is not set, all addresses are allowed
onRcptTo(rcpt, session, callback) {
//accept
callback();
},
// Handle message stream
onData(stream, session, callback) {
let chunks = [];
let chunklen = 0;
stream.on('readable', () => {
let chunk;
while ((chunk = stream.read()) !== null) {
chunks.push(chunk);
chunklen += chunk.length;
}
});
stream.once('error', err => {
log.error('SMTP', err);
db.redis.incr('msa:count:streamerr', () => false);
callback(new Error('Error reading from stream'));
});
stream.once('end', () => {
let sender = tools.normalizeAddress(
(session.envelope.mailFrom &&
session.envelope.mailFrom.address) ||
''
);
let recipients = session.envelope.rcptTo.map(rcpt =>
tools.normalizeAddress(rcpt.address)
);
// create Delivered-To and Received headers
let header = Buffer.from(
['Return-Path: <' + (sender || '') + '>'].join('\r\n') + '\r\n'
//+ 'Received: ' + generateReceivedHeader(session, queueId, os.hostname().toLowerCase(), recipient) + '\r\n'
);
chunks.unshift(header);
chunklen += header.length;
let raw = Buffer.concat(chunks, chunklen);
db.messageHandler.prepareMessage(
{
raw
},
(err, prepared) => {
if (err) {
log.error('SMTP', err);
db.redis.incr('msa:count:parseerr', () => false);
return callback(new Error('Error parsing message'));
}
let maildata = db.messageHandler.indexer.getMaildata(
prepared.mimeTree
);
// default flags
let flags = ['$msa$delivery'];
// default mailbox target is Sent Mail
let mailboxQueryKey = 'specialUse';
let mailboxQueryValue = '\\Sent';
mailboxQueryKey = 'path';
mailboxQueryValue = 'INBOX';
let messageOptions = {
user: session.user,
[mailboxQueryKey]: mailboxQueryValue,
prepared,
maildata,
meta: {
source: 'SMTP',
from: sender,
to: recipients,
origin: session.remoteAddress,
originhost: session.clientHostname,
transhost: session.hostNameAppearsAs,
transtype: session.transmissionType,
time: Date.now()
},
filters: [],
date: false,
flags,
// if similar message exists, then skip
skipExisting: true
};
db.messageHandler.add(
messageOptions,
(err, inserted, info) => {
if (err) {
db.redis.incr(
'msa:count:storeerr',
() => false
);
return callback(err);
}
db.redis
.multi()
.incr('msa:count:accept')
.hincrby(
'msa:count:accept:daily',
new Date().toISOString().substr(0, 10),
1
)
.exec(() => false);
let msgid = etherealId.get(
info.mailbox.toString(),
info.id.toString(),
info.uid
);
return callback(
null,
'Accepted [STATUS=' +
info.status +
' MSGID=' +
msgid +
']'
);
}
);
}
);
});
}
};
let updateTLSOptions = serverOptions => {
Object.keys(config.tls || {}).forEach(key => {
if (!['key', 'cert', 'ca'].includes(key)) {
serverOptions[key] = config.tls[key];
}
});
if (config.tls.key) {
serverOptions.key = fs.readFileSync(config.tls.key);
let ca = []
.concat(config.tls.ca || [])
.map(path => fs.readFileSync(path));
if (ca.length) {
serverOptions.ca = ca;
}
serverOptions.cert = fs.readFileSync(config.tls.cert);
if (
config.tls.dhparam &&
typeof config.tls.dhparam === 'string' &&
config.tls.dhparam.indexOf('\n') < 0
) {
serverOptions.dhparam = fs.readFileSync(config.tls.dhparam);
}
}
};
updateTLSOptions(serverOptions);
const server = new SMTPServer(serverOptions);
config.on('reload', () => {
let certOptions = {};
updateTLSOptions(certOptions);
server.updateSecureContext(certOptions);
});
module.exports = done => {
let started = false;
server.on('error', err => {
if (!started) {
started = true;
return done(err);
}
log.error('SMTP', err);
});
server.listen(config.smtp.port, config.smtp.host, () => {
if (started) {
return server.close();
}
started = true;
done(null, server);
});
};