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connection.js
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connection.js
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'use strict';
// a single connection
// node.js built-in libs
const dns = require('dns');
const fs = require('fs');
const net = require('net');
const os = require('os');
const path = require('path');
// npm libs
const ipaddr = require('ipaddr.js');
const config = require('haraka-config');
const constants = require('haraka-constants');
const net_utils = require('haraka-net-utils');
const Notes = require('haraka-notes');
const utils = require('haraka-utils');
const Address = require('address-rfc2821').Address;
const ResultStore = require('haraka-results');
// Haraka libs
const logger = require('./logger');
const trans = require('./transaction');
const plugins = require('./plugins');
const rfc1869 = require('./rfc1869');
const outbound = require('./outbound');
const hpj = fs.readFileSync(path.join(__dirname, 'package.json'));
const states = constants.connection.state;
// Load HAProxy hosts into an object for fast lookups
// as this list is checked on every new connection.
let haproxy_hosts_ipv4 = [];
let haproxy_hosts_ipv6 = [];
function loadHAProxyHosts () {
const hosts = config.get('haproxy_hosts', 'list', loadHAProxyHosts);
const new_ipv4_hosts = [];
const new_ipv6_hosts = [];
for (let i=0; i<hosts.length; i++) {
const host = hosts[i].split(/\//);
if (net.isIPv6(host[0])) {
new_ipv6_hosts[i] =
[ipaddr.IPv6.parse(host[0]), parseInt(host[1] || 64)];
}
else {
new_ipv4_hosts[i] =
[ipaddr.IPv4.parse(host[0]), parseInt(host[1] || 32)];
}
}
haproxy_hosts_ipv4 = new_ipv4_hosts;
haproxy_hosts_ipv6 = new_ipv6_hosts;
}
loadHAProxyHosts();
class Connection {
constructor (client, server) {
this.client = client;
this.server = server;
this.local = { // legacy property locations
ip: null, // c.local_ip
port: null, // c.local_port
host: config.get('me') || os.hostname(),
info: 'Haraka',
};
this.remote = {
ip: null, // c.remote_ip
port: null, // c.remote_port
host: null, // c.remote_host
info: null, // c.remote_info
closed: false, // c.remote_closed
is_private: false,
is_local: false,
};
this.hello = {
host: null, // c.hello_host
verb: null, // c.greeting
};
this.tls = {
enabled: false, // c.using_tls
advertised: false, // c.notes.tls_enabled
verified: false,
cipher: {},
};
this.proxy = {
allowed: false, // c.proxy
ip: null, // c.haproxy_ip
type: null,
timer: null, // c.proxy_timer
};
this.set('tls', 'enabled', (server.has_tls ? true : false));
this.current_data = null;
this.current_line = null;
this.state = states.PAUSE;
this.encoding = 'utf8';
this.prev_state = null;
this.loop_code = null;
this.loop_msg = null;
this.uuid = utils.uuid();
this.notes = new Notes();
this.transaction = null;
this.tran_count = 0;
this.capabilities = null;
this.ehlo_hello_message = config.get('ehlo_hello_message') || 'Haraka is at your service.'
this.banner_includes_uuid = config.get('banner_includes_uuid') ? true : false;
this.deny_includes_uuid = config.get('deny_includes_uuid') || null;
this.early_talker = false;
this.pipelining = false;
this._relaying = false;
this.esmtp = false;
this.last_response = null;
this.hooks_to_run = [];
this.start_time = Date.now();
this.last_reject = '';
this.max_bytes = parseInt(config.get('databytes')) || 0;
this.max_mime_parts = parseInt(config.get('max_mime_parts')) || 1000;
this.totalbytes = 0;
this.rcpt_count = {
accept: 0,
tempfail: 0,
reject: 0,
};
this.msg_count = {
accept: 0,
tempfail: 0,
reject: 0,
};
this.max_line_length = parseInt(config.get('max_line_length')) || 512;
this.max_data_line_length = parseInt(config.get('max_data_line_length')) || 992;
this.results = new ResultStore(this);
this.errors = 0;
this.last_rcpt_msg = null;
this.hook = null;
this.header_hide_version = config.get('header_hide_version') ? true : false;
if (!this.header_hide_version) {
this.local.info += `/${JSON.parse(hpj).version}`;
}
Connection.setupClient(this);
}
static setupClient (self) {
const ip = self.client.remoteAddress;
if (!ip) {
self.logdebug('setupClient got no IP address for this connection!');
self.client.destroy();
return;
}
const local_addr = self.server.address();
if (local_addr && local_addr.address) {
self.set('local', 'ip', ipaddr.process(local_addr.address).toString());
self.set('local', 'port', local_addr.port);
self.results.add({name: 'local'}, self.local);
}
self.set('remote', 'ip', ipaddr.process(ip).toString());
self.set('remote', 'port', self.client.remotePort);
self.results.add({name: 'remote'}, self.remote);
self.lognotice(
'connect',
{
ip: self.remote.ip,
port: self.remote.port,
local_ip: self.local.ip,
local_port: self.local.port
}
);
const has_host = self.remote.host ? `${self.remote.host} ` : '';
const rhost = `client ${has_host}[${self.remote.ip}]`
if (!self.client.on) return;
self.client.on('end', () => {
if (self.state >= states.DISCONNECTING) return;
self.remote.closed = true;
self.loginfo(`${rhost} half closed connection`);
self.fail();
});
self.client.on('close', has_error => {
if (self.state >= states.DISCONNECTING) return;
self.remote.closed = true;
self.loginfo(`${rhost} dropped connection`);
self.fail();
});
self.client.on('error', err => {
if (self.state >= states.DISCONNECTING) return;
self.loginfo(`${rhost} connection error: ${err}`);
self.fail();
});
self.client.on('timeout', () => {
if (self.state >= states.DISCONNECTING) return;
self.respond(421, 'timeout', () => {
self.fail(`${rhost} connection timed out`);
});
});
self.client.on('data', data => {
self.process_data(data);
});
const ha_list = net.isIPv6(self.remote.ip) ? haproxy_hosts_ipv6 : haproxy_hosts_ipv4;
if (ha_list.some((element, index, array) => {
return ipaddr.parse(self.remote.ip).match(element[0], element[1]);
})) {
self.proxy.allowed = true;
// Wait for PROXY command
self.proxy.timer = setTimeout(() => {
self.respond(421, 'PROXY timeout',() => {
self.disconnect();
});
}, 30 * 1000);
}
else {
plugins.run_hooks('connect_init', self);
}
}
setTLS (obj) {
this.set('hello', 'host', undefined);
this.set('tls', 'enabled', true);
const options = ['cipher','verified','verifyError','peerCertificate'];
options.forEach(t => {
if (obj[t] === undefined) return;
this.set('tls', t, obj[t]);
})
// prior to 2017-07, authorized and verified were both used. Verified
// seems to be the more common and has the property updated in the
// tls object. However, authorized has been up-to-date in the notes. Store
// in both, for backwards compatibility.
this.notes.tls = {
authorized: obj.verified, // legacy name
authorizationError: obj.verifyError,
cipher: obj.cipher,
peerCertificate: obj.peerCertificate,
}
}
set (prop_str, val) {
if (arguments.length === 3) {
prop_str = `${arguments[0]}.${arguments[1]}`;
val = arguments[2];
}
const path_parts = prop_str.split('.');
let loc = this;
for (let i=0; i < path_parts.length; i++) {
const part = path_parts[i];
// while another part remains
if (i < (path_parts.length - 1)) {
if (loc[part] === undefined) loc[part] = {}; // initialize
loc = loc[part]; // descend
continue;
}
// last part, so assign the value
loc[part] = val;
}
// Set is_private, is_local automatically when remote.ip is set
if (prop_str === 'remote.ip') {
this.set('remote.is_local', net_utils.is_local_ip(this.remote.ip));
if (this.remote.is_local) {
this.set('remote.is_private', true);
}
else {
this.set('remote.is_private', net_utils.is_private_ipv4(this.remote.ip));
}
}
// sunset 3.0.0
if (prop_str === 'hello.verb') {
this.greeting = val;
}
else if (prop_str === 'tls.enabled') {
this.using_tls = val;
}
else if (prop_str === 'proxy.ip') {
this.haproxy_ip = val;
}
else {
const legacy_name = prop_str.split('.').join('_');
this[legacy_name] = val;
}
// /sunset
}
get (prop_str) {
return prop_str.split('.').reduce((prev, curr) => {
return prev ? prev[curr] : undefined
}, this)
}
set relaying (val) {
if (this.transaction) {
this.transaction._relaying = val;
}
else {
this._relaying = val;
}
}
get relaying () {
if (this.transaction && '_relaying' in this.transaction) return this.transaction._relaying;
return this._relaying;
}
process_line (line) {
const self = this;
if (this.state >= states.DISCONNECTING) {
if (logger.would_log(logger.LOGPROTOCOL)) {
this.logprotocol(`C: (after-disconnect): ${this.current_line}`, {'state': this.state});
}
this.loginfo(`data after disconnect from ${this.remote.ip}`);
return;
}
if (this.state === states.DATA) {
if (logger.would_log(logger.LOGDATA)) {
this.logdata(`C: ${line}`);
}
this.accumulate_data(line);
return;
}
this.current_line = line.toString(this.encoding).replace(/\r?\n/, '');
if (logger.would_log(logger.LOGPROTOCOL)) {
this.logprotocol(`C: ${this.current_line}`, {'state': this.state});
}
// Check for non-ASCII characters
/* eslint no-control-regex: 0 */
if (/[^\x00-\x7F]/.test(this.current_line)) {
// See if this is a TLS handshake
const buf = Buffer.from(this.current_line.substr(0,3), 'binary');
if (buf[0] === 0x16 && buf[1] === 0x03 &&
(buf[2] === 0x00 || buf[2] === 0x01) // SSLv3/TLS1.x format
) {
// Nuke the current input buffer to prevent processing further input
this.current_data = null;
this.respond(501, 'SSL attempted over a non-SSL socket');
this.disconnect();
return;
}
else if (this.hello.verb == 'HELO') {
return this.respond(501, 'Syntax error (8-bit characters not allowed)');
}
}
if (this.state === states.CMD) {
this.state = states.PAUSE_SMTP;
const matches = /^([^ ]*)( +(.*))?$/.exec(this.current_line);
if (!matches) {
return plugins.run_hooks('unrecognized_command',
this, [this.current_line]);
}
const cmd = matches[1];
const method = `cmd_${cmd.toLowerCase()}`;
const remaining = matches[3] || '';
if (this[method]) {
try {
this[method](remaining);
}
catch (err) {
if (err.stack) {
const c = this;
c.logerror(`${method} failed: ${err}`);
err.stack.split("\n").forEach(c.logerror);
}
else {
this.logerror(`${method} failed: ${err}`);
}
this.respond(421, "Internal Server Error", () => {
self.disconnect();
});
}
}
else {
// unrecognized command
plugins.run_hooks('unrecognized_command', this, [ cmd, remaining ]);
}
}
else if (this.state === states.LOOP) {
// Allow QUIT
if (this.current_line.toUpperCase() === 'QUIT') {
this.cmd_quit();
}
else {
this.respond(this.loop_code, this.loop_msg);
}
}
else {
throw new Error(`unknown state ${this.state}`);
}
}
process_data (data) {
if (this.state >= states.DISCONNECTING) {
this.logwarn(`data after disconnect from ${this.remote.ip}`);
return;
}
if (!this.current_data || !this.current_data.length) {
this.current_data = data;
}
else {
// Data left over in buffer
const buf = Buffer.concat(
[ this.current_data, data ],
(this.current_data.length + data.length)
);
this.current_data = buf;
}
this._process_data();
}
_process_data () {
const self = this;
// We *must* detect disconnected connections here as the state
// only transitions to states.CMD in the respond function below.
// Otherwise if multiple commands are pipelined and then the
// connection is dropped; we'll end up in the function forever.
if (this.state >= states.DISCONNECTING) return;
let maxlength;
if (this.state === states.PAUSE_DATA || this.state === states.DATA) {
maxlength = this.max_data_line_length;
}
else {
maxlength = this.max_line_length;
}
let offset;
while (this.current_data && ((offset = utils.indexOfLF(this.current_data, maxlength)) !== -1)) {
if (this.state === states.PAUSE_DATA) {
return;
}
let this_line = this.current_data.slice(0, offset+1);
// Hack: bypass this code to allow HAProxy's PROXY extension
const proxyStart = this.proxy.allowed && /^PROXY /.test(this_line);
if (this.state === states.PAUSE && proxyStart) {
if (this.proxy.timer) clearTimeout(this.proxy.timer);
this.state = states.CMD;
this.current_data = this.current_data.slice(this_line.length);
this.process_line(this_line);
}
// Detect early_talker but allow PIPELINING extension (ESMTP)
else if ((this.state === states.PAUSE || this.state === states.PAUSE_SMTP) && !this.esmtp) {
// Allow EHLO/HELO to be pipelined with PROXY
if (this.proxy.allowed && /^(?:EH|HE)LO /i.test(this_line)) return;
if (!this.early_talker) {
this_line = this_line.toString().replace(/\r?\n/,'');
this.logdebug('[early_talker]', { state: this.state, esmtp: this.esmtp, line: this_line });
}
this.early_talker = true;
setImmediate(() => { self._process_data() });
break;
}
else if ((this.state === states.PAUSE || this.state === states.PAUSE_SMTP) && this.esmtp) {
let valid = true;
const cmd = this_line.toString('ascii').slice(0,4).toUpperCase();
switch (cmd) {
case 'RSET':
case 'MAIL':
case 'SEND':
case 'SOML':
case 'SAML':
case 'RCPT':
// These can be anywhere in the group
break;
default:
// Anything else *MUST* be the last command in the group
if (this_line.length !== this.current_data.length) {
valid = false;
}
break;
}
if (valid) {
// Valid PIPELINING
// We *don't want to process this yet otherwise the
// current_data buffer will be lost. The respond()
// function will call this function again once it
// has reset the state back to states.CMD and this
// ensures that we only process one command at a
// time.
this.pipelining = true;
this.logdebug(`pipeline: ${this_line}`);
}
else {
// Invalid pipeline sequence
// Treat this as early talker
if (!this.early_talker) {
this.logdebug('[early_talker]', { state: this.state, esmtp: this.esmtp, line: this_line });
}
this.early_talker = true;
setImmediate(() => { self._process_data() });
}
break;
}
else {
this.current_data = this.current_data.slice(this_line.length);
this.process_line(this_line);
}
}
if (this.current_data && (this.current_data.length > maxlength) &&
(utils.indexOfLF(this.current_data, maxlength) === -1)) {
if (this.state !== states.DATA && this.state !== states.PAUSE_DATA) {
// In command mode, reject:
this.client.pause();
this.current_data = null;
return this.respond(521, "Command line too long", () => {
self.disconnect();
});
}
else {
this.loginfo(`DATA line length (${this.current_data.length}) exceeds limit of ${maxlength} bytes`);
this.transaction.notes.data_line_length_exceeded = true;
const b = Buffer.concat([
this.current_data.slice(0, maxlength - 2),
Buffer.from("\r\n ", 'utf8'),
this.current_data.slice(maxlength - 2)
], this.current_data.length + 3);
this.current_data = b;
return this._process_data();
}
}
}
respond (code, msg, func) {
let uuid = '';
let messages;
if (this.state === states.DISCONNECTED) {
if (func) func();
return;
}
// Check to see if DSN object was passed in
if (typeof msg === 'object' && msg.constructor.name === 'DSN') {
// Override
code = msg.code;
msg = msg.reply;
}
if (!Array.isArray(msg)) {
messages = msg.toString().split(/\n/);
}
else {
messages = msg.slice();
}
messages = messages.filter((msg2) => {
return /\S/.test(msg2);
});
// Multiline AUTH PLAIN as in RFC-4954 page 8.
if (code === 334 && !messages.length) {
messages = [' '];
}
if (code >= 400) {
this.last_reject = `${code} ${messages.join(' ')}`;
if (this.deny_includes_uuid) {
uuid = (this.transaction || this).uuid;
if (this.deny_includes_uuid > 1) {
uuid = uuid.substr(0, this.deny_includes_uuid);
}
}
}
let mess;
let buf = '';
const hostname = os.hostname().split('.').shift();
const _uuid = uuid ? `[${uuid}@${hostname}] ` : '';
while ((mess = messages.shift())) {
const line = `${code}${(messages.length ? "-" : " ")}${_uuid}${mess}`;
this.logprotocol(`S: ${line}`);
buf = `${buf}${line}\r\n`;
}
try {
this.client.write(buf);
}
catch (err) {
return this.fail(`Writing response: ${buf} failed: ${err}`);
}
// Store the last response
this.last_response = buf;
// Don't change loop state
if (this.state !== states.LOOP) {
this.state = states.CMD;
}
// Run optional closure before handling and further commands
if (func) func();
// Process any buffered commands (PIPELINING)
this._process_data();
}
fail (err) {
if (err) this.logwarn(err);
this.hooks_to_run = [];
this.disconnect();
}
disconnect () {
if (this.state >= states.DISCONNECTING) return;
const self = this;
self.state = states.DISCONNECTING;
self.current_data = null; // don't process any more data we have already received
this.reset_transaction(() => {
plugins.run_hooks('disconnect', self);
});
}
disconnect_respond () {
const logdetail = {
'ip': this.remote.ip,
'rdns': ((this.remote.host) ? this.remote.host : ''),
'helo': ((this.hello.host) ? this.hello.host : ''),
'relay': (this.relaying ? 'Y' : 'N'),
'early': (this.early_talker ? 'Y' : 'N'),
'esmtp': (this.esmtp ? 'Y' : 'N'),
'tls': (this.tls.enabled ? 'Y' : 'N'),
'pipe': (this.pipelining ? 'Y' : 'N'),
'errors': this.errors,
'txns': this.tran_count,
'rcpts': `${this.rcpt_count.accept}/${this.rcpt_count.tempfail}/${this.rcpt_count.reject}`,
'msgs': `${this.msg_count.accept}/${this.msg_count.tempfail}/${this.msg_count.reject}`,
'bytes': this.totalbytes,
'lr': ((this.last_reject) ? this.last_reject : ''),
'time': (Date.now() - this.start_time)/1000,
};
this.results.add({name: 'disconnect'}, {
duration: (Date.now() - this.start_time)/1000,
});
this.lognotice('disconnect', logdetail);
this.state = states.DISCONNECTED;
this.client.end();
}
get_capabilities () {
const capabilities = [];
return capabilities;
}
tran_uuid () {
this.tran_count++;
return `${this.uuid}.${this.tran_count}`;
}
reset_transaction (cb) {
this.results.add({name: 'reset'}, {
duration: (Date.now() - this.start_time)/1000,
});
if (this.transaction && this.transaction.resetting === false) {
// Pause connection to allow the hook to complete
this.pause();
this.transaction.resetting = true;
plugins.run_hooks('reset_transaction', this, cb);
}
else {
this.transaction = null;
if (cb) cb();
}
}
reset_transaction_respond (retval, msg, cb) {
if (this.transaction) {
this.transaction.message_stream.destroy();
this.transaction = null;
}
if (cb) cb();
// Allow the connection to continue
this.resume();
}
init_transaction (cb) {
const self = this;
this.reset_transaction(() => {
self.transaction = trans.createTransaction(self.tran_uuid());
// Catch any errors from the message_stream
self.transaction.message_stream.on('error', (err) => {
self.logcrit(`message_stream error: ${err.message}`);
self.respond('421', 'Internal Server Error', () => {
self.disconnect();
});
});
self.transaction.results = new ResultStore(self);
if (cb) cb();
});
}
loop_respond (code, msg) {
if (this.state >= states.DISCONNECTING) return;
this.state = states.LOOP;
this.loop_code = code;
this.loop_msg = msg;
this.respond(code, msg);
}
pause () {
const self = this;
if (self.state >= states.DISCONNECTING) return;
self.client.pause();
if (self.state !== states.PAUSE_DATA) self.prev_state = self.state;
self.state = states.PAUSE_DATA;
}
resume () {
const self = this;
if (self.state >= states.DISCONNECTING) return;
self.client.resume();
if (self.prev_state) {
self.state = self.prev_state;
self.prev_state = null;
}
setImmediate(() => self._process_data());
}
/////////////////////////////////////////////////////////////////////////////
// SMTP Responses
connect_init_respond (retval, msg) {
// retval and message are ignored
this.logdebug('running connect_init_respond');
plugins.run_hooks('lookup_rdns', this);
}
lookup_rdns_respond (retval, msg) {
const self = this;
switch (retval) {
case constants.ok:
this.set('remote', 'host', (msg || 'Unknown'));
this.set('remote', 'info', (this.remote.info || this.remote.host));
plugins.run_hooks('connect', this);
break;
case constants.deny:
this.loop_respond(554, msg || "rDNS Lookup Failed");
break;
case constants.denydisconnect:
case constants.disconnect:
this.respond(554, msg || "rDNS Lookup Failed", () => {
self.disconnect();
});
break;
case constants.denysoft:
this.loop_respond(421, msg || "rDNS Temporary Failure");
break;
case constants.denysoftdisconnect:
this.respond(421, msg || "rDNS Temporary Failure", () => {
self.disconnect();
});
break;
default:
dns.reverse(this.remote.ip, (err, domains) => {
self.rdns_response(err, domains);
});
}
}
rdns_response (err, domains) {
if (err) {
switch (err.code) {
case dns.NXDOMAIN:
case dns.NOTFOUND:
this.set('remote', 'host', 'NXDOMAIN');
break;
default:
this.set('remote', 'host', 'DNSERROR');
break;
}
}
else {
this.set('remote', 'host', (domains[0] || 'Unknown'));
this.results.add({name: 'remote'}, this.remote);
}
this.set('remote', 'info', this.remote.info || this.remote.host);
plugins.run_hooks('connect', this);
}
unrecognized_command_respond (retval, msg) {
const self = this;
switch (retval) {
case constants.ok:
// response already sent, cool...
break;
case constants.next_hook:
plugins.run_hooks(msg, this);
break;
case constants.deny:
this.respond(500, msg || "Unrecognized command");
break;
case constants.denydisconnect:
case constants.denysoftdisconnect:
this.respond(521, msg || "Unrecognized command", () => {
self.disconnect();
});
break;
default:
this.errors++;
this.respond(500, msg || "Unrecognized command");
}
}
connect_respond (retval, msg) {
const self = this;
// RFC 5321 Section 4.3.2 states that the only valid SMTP codes here are:
// 220 = Service ready
// 554 = Transaction failed (no SMTP service here)
// 421 = Service shutting down and closing transmission channel
switch (retval) {
case constants.deny:
this.loop_respond(554, msg || "Your mail is not welcome here");
break;
case constants.denydisconnect:
case constants.disconnect:
this.respond(554, msg || "Your mail is not welcome here", () => {
self.disconnect();
});
break;
case constants.denysoft:
this.loop_respond(421, msg || "Come back later");
break;
case constants.denysoftdisconnect:
this.respond(421, msg || "Come back later", () => {
self.disconnect();
});
break;
default: {
let greeting = config.get('smtpgreeting', 'list');
if (greeting.length) {
// RFC5321 section 4.2
// Hostname/domain should appear after the 220
greeting[0] = `${this.local.host} ESMTP ${greeting[0]}`;
if (this.banner_includes_uuid) {
greeting[0] += ` (${this.uuid})`;
}
}
else {
greeting = `${this.local.host} ESMTP ${this.local.info} ready`;
if (this.banner_includes_uuid) {
greeting += ` (${this.uuid})`;
}
}
this.respond(220, msg || greeting);
}
}
}
get_remote (prop) {
switch (this.remote[prop]) {
case 'NXDOMAIN':
case 'DNSERROR':
case '':
case undefined:
case null:
return `[${this.remote.ip}]`;
default:
return `${this.remote[prop]} [${this.remote.ip}]`;
}
}
helo_respond (retval, msg) {
const self = this;
switch (retval) {
case constants.deny:
this.respond(550, msg || "HELO denied", () => {
self.set('hello', 'verb', null);
self.set('hello', 'host', null);
});
break;
case constants.denydisconnect:
this.respond(550, msg || "HELO denied", () => {
self.disconnect();
});
break;
case constants.denysoft:
this.respond(450, msg || "HELO denied", () => {
self.set('hello', 'verb', null);
self.set('hello', 'host', null);
});
break;
case constants.denysoftdisconnect:
this.respond(450, msg || "HELO denied", () => {
self.disconnect();
});
break;
default:
// RFC5321 section 4.1.1.1
// Hostname/domain should appear after 250
this.respond(250, `${this.local.host} Hello ${this.get_remote('host')}${this.ehlo_hello_message}`);
}
}
ehlo_respond (retval, msg) {
const self = this;
switch (retval) {
case constants.deny:
this.respond(550, msg || "EHLO denied", () => {
self.set('hello', 'verb', null);
self.set('hello', 'host', null);
});
break;
case constants.denydisconnect:
this.respond(550, msg || "EHLO denied", () => {
self.disconnect();
});
break;
case constants.denysoft:
this.respond(450, msg || "EHLO denied", () => {
self.set('hello', 'verb', null);
self.set('hello', 'host', null);
});
break;
case constants.denysoftdisconnect:
this.respond(450, msg || "EHLO denied", () => {
self.disconnect();
});
break;
default: {
// RFC5321 section 4.1.1.1
// Hostname/domain should appear after 250
const response = [
`${this.local.host} Hello ${this.get_remote('host')}${this.ehlo_hello_message}`,
"PIPELINING",
"8BITMIME",
"SMTPUTF8",
];
response.push(`SIZE ${this.max_bytes}`);
this.capabilities = response;
plugins.run_hooks('capabilities', this);
this.esmtp = true;
}
}
}
capabilities_respond (retval, msg) {
this.respond(250, this.capabilities);
}
quit_respond (retval, msg) {
const self = this;
this.respond(221, msg || `${this.local.host} closing connection. Have a jolly good day.`, () => {
self.disconnect();
});
}
vrfy_respond (retval, msg) {
const self = this;
switch (retval) {
case constants.deny:
this.respond(550, msg || "Access Denied", () => {
self.reset_transaction();
});
break;
case constants.denydisconnect:
this.respond(550, msg || "Access Denied", () => {
self.disconnect();
});
break;
case constants.denysoft:
this.respond(450, msg || "Lookup Failed", () => {
self.reset_transaction();
});
break;
case constants.denysoftdisconnect:
this.respond(450, msg || "Lookup Failed", () => {
self.disconnect();
});
break;
case constants.ok:
this.respond(250, msg || "User OK");
break;
default:
this.respond(252, "Just try sending a mail and we'll see how it turns out...");
}
}
noop_respond (retval, msg) {
const self = this;
switch (retval) {
case constants.deny:
this.respond(500, msg || "Stop wasting my time");
break;
case constants.denydisconnect:
this.respond(500, msg || "Stop wasting my time", () => {
self.disconnect();
});
break;
default:
this.respond(250, "OK");
}
}
rset_respond (retval, msg) {
// We ignore any plugin responses
const self = this;
this.respond(250, "OK", () => {
self.reset_transaction();
})
}
mail_respond (retval, msg) {
const self = this;
if (!this.transaction) {
this.logerror("mail_respond found no transaction!");
return;
}
const sender = this.transaction.mail_from;
const dmsg = `sender ${sender.format()}`;
this.lognotice(
dmsg,
{
'code': constants.translate(retval),
'msg': (msg || ''),
}
);
function store_results (action) {