func smtpSendMailPart2(c *smtp.Client, smtpHost string, a smtp.Auth, from string, to []string, msg []byte) (err error) {
defer c.Close()
if err = c.Hello("localhost"); err != nil {
return err
}
if ok, _ := c.Extension("STARTTLS"); ok {
config := &tls.Config{ServerName: smtpHost}
if err = c.StartTLS(config); err != nil {
return err
}
}
if a != nil {
if ok, _ := c.Extension("AUTH"); ok {
if err = c.Auth(a); err != nil {
return err
}
}
}
if err = c.Mail(from); err != nil {
return err
}
for _, addr := range to {
if err = c.Rcpt(addr); err != nil {
return err
}
}
w, err := c.Data()
if err != nil {
return err
}
_, err = w.Write(msg)
if err != nil {
return err
}
err = w.Close()
if err != nil {
return err
}
return c.Quit()
}
func (DefaultSender) Send(from, to, content string) error {
var (
err error
c *smtp.Client
auth smtp.Auth
)
log.Println("mail: sending mail to " + to)
auth, err = DefaultSender{}.auth()
if nil != err {
return err
}
c, err = smtp.Dial(MAIL_HOST + ":" + MAIL_PORT)
if nil != err {
return err
}
defer c.Close()
tlc := &tls.Config{
InsecureSkipVerify: true,
ServerName: MAIL_HOST,
}
if err = c.StartTLS(tlc); err != nil {
log.Println("tls error " + err.Error())
return err
}
c.Auth(auth)
c.Mail(from)
c.Rcpt(to)
// Send the email body.
wc, err := c.Data()
if err != nil {
log.Fatal(err)
}
defer wc.Close()
buf := bytes.NewBufferString(content)
if _, err = buf.WriteTo(wc); err != nil {
log.Fatal(err)
}
if err != nil {
log.Println("email: failed to write " + err.Error())
return err
}
return err
}
func handleQUIT(rec *SMTPRecord, c *smtp.Client, proxy *SMTPSession) error {
id, err := c.Text.Cmd(rec.Cmd.Packet)
if err != nil {
return err
}
c.Text.StartResponse(id)
defer c.Text.EndResponse(id)
msg, err := collectClientLines(c.Text)
if err != nil {
return err
}
fmt.Fprint(proxy.base.Conn, msg)
c.Close()
proxy.Close()
return nil
}
// send does the low level sending of the email
func send(host string, port string, from string, to []string, msg string, auth smtp.Auth, encryption encryption, config *tls.Config, connectTimeout int) error {
var smtpConnectChannel chan smtpConnectErrorChannel
var c *smtp.Client = nil
var err error
// set the timeout value
timeout := time.Duration(connectTimeout) * time.Second
// if there is a timeout, setup the channel and do the connect under a goroutine
if timeout != 0 {
smtpConnectChannel = make(chan smtpConnectErrorChannel, 2)
go func() {
c, err = smtpConnect(host, port, from, to, msg, auth, encryption, config)
// send the result
smtpConnectChannel <- smtpConnectErrorChannel{
client: c,
err: err,
}
}()
}
if timeout == 0 {
// no timeout, just fire the connect
c, err = smtpConnect(host, port, from, to, msg, auth, encryption, config)
} else {
// get the connect result or timeout result, which ever happens first
select {
case result := <-smtpConnectChannel:
c = result.client
err = result.err
case <-time.After(timeout):
return errors.New("Mail Error: SMTP Connection timed out")
}
}
// check for connect error
if err != nil {
return err
}
defer c.Close()
// Set the sender
if err := c.Mail(from); err != nil {
return err
}
// Set the recipients
for _, address := range to {
if err := c.Rcpt(address); err != nil {
return err
}
}
// Send the data command
w, err := c.Data()
if err != nil {
return err
}
// write the message
_, err = fmt.Fprint(w, msg)
if err != nil {
return err
}
err = w.Close()
if err != nil {
return err
}
return c.Quit()
}
// TestSMTP tests if can connect with the server and send some commands.
func TestSMTP(addr string, a smtp.Auth, hello string, timeout time.Duration, insecureSkipVerify bool) error {
serverName := addr
port := ""
s := strings.SplitN(addr, ":", 2)
if len(s) >= 2 {
serverName = s[0]
port = s[1]
}
if serverName == "" || port == "" {
return e.New("addrs is invalid")
}
hosts, err := dns.LookupHostCache(serverName)
if err != nil {
return e.Forward(err)
}
if len(hosts) == 0 {
return e.New("can't resolve the addr")
}
conn, err := net.DialTimeout("tcp", hosts[0]+":"+port, timeout)
if err != nil {
return e.Forward(err)
}
defer conn.Close()
command := &Command{
Timeout: timeout,
Conn: conn,
}
var c *smtp.Client
r := command.Exec(smtp.NewClient, conn, serverName)
r(&c, &err)
if err != nil {
return e.Forward(err)
}
defer c.Close()
if hello != "" {
r = command.Exec(c.Hello, hello)
r(&err)
if err != nil {
return e.Forward(err)
}
}
if ok, _ := c.Extension("STARTTLS"); ok {
r = command.Exec(c.StartTLS, &tls.Config{
ServerName: serverName,
InsecureSkipVerify: insecureSkipVerify,
})
r(&err)
if err != nil {
return e.Forward(err)
}
}
if a != nil {
found, _ := c.Extension("AUTH")
if found {
r = command.Exec(c.Auth, a)
r(&err)
if err != nil {
return e.Forward(err)
}
}
}
r = command.Exec(c.Reset)
r(&err)
if err != nil {
return e.New(err)
}
r = command.Exec(c.Quit)
r(&err)
if err != nil {
return e.New(err)
}
return nil
}
// SendMail send a message to specific destination (to) using smtp server in addrs
// and a auth.
func SendMail(addr string, a smtp.Auth, from string, to []string, hello string, msg []byte, timeout time.Duration, insecureSkipVerify bool) error {
serverName := addr
port := ""
serverName, port, err := net.SplitHostPort(addr)
if err != nil {
return e.Push(err, "invalid adderess")
}
if serverName == "" || port == "" {
return e.New("addrs is invalid")
}
conn, err := net.DialTimeout("tcp", addr, timeout)
if err != nil {
return e.New(err)
}
defer conn.Close()
command := &Command{
Timeout: timeout,
Conn: conn,
}
var c *smtp.Client
r := command.Exec(smtp.NewClient, conn, serverName)
r(&c, &err)
if err != nil {
return e.Forward(err)
}
defer c.Close()
if hello != "" {
r = command.Exec(c.Hello, hello)
r(&err)
if err != nil {
return e.Forward(err)
}
}
if ok, _ := c.Extension("STARTTLS"); ok {
r = command.Exec(c.StartTLS, &tls.Config{
ServerName: serverName,
InsecureSkipVerify: insecureSkipVerify,
})
r(&err)
if err != nil {
return e.Forward(err)
}
}
if a != nil {
found, _ := c.Extension("AUTH")
if found {
r = command.Exec(c.Auth, a)
r(&err)
if err != nil {
return e.Forward(err)
}
}
}
r = command.Exec(c.Mail, from)
r(&err)
if err != nil {
return e.Forward(err)
}
for _, addr := range to {
r = command.Exec(c.Rcpt, addr)
r(&err)
if err != nil {
return e.New(err)
}
}
var w io.WriteCloser
r = command.ExecTimeout(0, c.Data)
r(&w, &err)
if err != nil {
return e.New(err)
}
_, err = w.Write(msg)
if err != nil {
return e.New(err)
}
err = w.Close()
if err != nil {
return e.New(err)
}
r = command.Exec(c.Quit)
r(&err)
if err != nil {
return e.New(err)
}
return nil
}
func sendEmail(templ, subject, username, toUser, tokenVerify, text, cmd, device string) error {
t := template.New("Email template")
t, err := t.Parse(templ)
if err != nil {
log.Errorf("Error with parsing template:%s ", err.Error())
return err
}
paramEmail := ¶mEmail{
TextVerify: text,
CMDVerify: cmd,
}
var b bytes.Buffer
err = t.Execute(&b, paramEmail)
if err != nil {
log.Errorf("Error with Execute template:%s ", err.Error())
return err
}
if viper.GetBool("no_smtp") {
fmt.Println("##### NO SMTP DISPLAY MAIL IN CONSOLE ######")
fmt.Printf("Subject:%s\n", subject)
fmt.Printf("Text:%s\n", b.Bytes())
fmt.Println("##### END MAIL ######")
return nil
}
from := mail.Address{
Name: "",
Address: viper.GetString("smtp_from"),
}
to := mail.Address{
Name: "",
Address: toUser,
}
// Setup headers
headers := make(map[string]string)
headers["From"] = viper.GetString("smtp_from")
headers["To"] = to.String()
headers["Subject"] = subject
// Setup message
message := ""
for k, v := range headers {
message += fmt.Sprintf("%s: %s\r\n", k, v)
}
message += "\r\n" + b.String()
// Connect to the SMTP Server
servername := fmt.Sprintf("%s:%s", viper.GetString("smtp_host"), viper.GetString("smtp_port"))
// TLS config
tlsconfig := &tls.Config{
InsecureSkipVerify: true,
ServerName: viper.GetString("smtp_host"),
}
var c *smtp.Client
if viper.GetBool("smtp_tls") {
// Here is the key, you need to call tls.Dial instead of smtp.Dial
// for smtp servers running on 465 that require an ssl connection
// from the very beginning (no starttls)
conn, errc := tls.Dial("tcp", servername, tlsconfig)
if errc != nil {
log.Errorf("Error with c.Dial:%s", errc.Error())
return err
}
c, err = smtp.NewClient(conn, viper.GetString("smtp_host"))
if err != nil {
log.Errorf("Error with c.NewClient:%s", err.Error())
return err
}
} else {
c, err = smtp.Dial(servername)
if err != nil {
log.Errorf("Error while smtp.Dial:%s", err)
}
defer c.Close()
}
// Auth
if viper.GetString("smtp_user") != "" && viper.GetString("smtp_password") != "" {
auth := smtp.PlainAuth("", viper.GetString("smtp_user"), viper.GetString("smtp_password"), viper.GetString("smtp_host"))
if err = c.Auth(auth); err != nil {
log.Errorf("Error with c.Auth:%s", err.Error())
return err
}
}
// To && From
if err = c.Mail(from.Address); err != nil {
log.Errorf("Error with c.Mail:%s", err.Error())
return err
}
if err = c.Rcpt(to.Address); err != nil {
log.Errorf("Error with c.Rcpt:%s", err.Error())
return err
}
// Data
w, err := c.Data()
if err != nil {
log.Errorf("Error with c.Data:%s", err.Error())
return err
}
_, err = w.Write([]byte(message))
if err != nil {
log.Errorf("Error with c.Write:%s", err.Error())
return err
}
err = w.Close()
if err != nil {
log.Errorf("Error with c.Close:%s", err.Error())
return err
}
c.Quit()
return nil
}
// SendMailMessage handles outgoing message to SMTP server.
//
// - The connections to the service can be either plain (port 25)
// or SSL/TLS (port 465)
//
// - If the server supports STARTTLS and the channel is not already
// encrypted (via SSL), the application will use the "STLS" command
// to initiate a channel encryption.
//
// - Connections can be tunneled through any SOCKS5 proxy (like Tor)
func SendMailMessage(host, proxy, fromAddr, toAddr string, body []byte) error {
var (
c0 net.Conn
c1 *tls.Conn
cli *smtp.Client
)
defer func() {
if cli != nil {
cli.Close()
}
if c1 != nil {
c1.Close()
}
if c0 != nil {
c0.Close()
}
}()
uSrv, err := url.Parse(host)
if err != nil {
return err
}
if proxy == "" {
c0, err = net.Dial("tcp", uSrv.Host)
} else {
host, port, err := SplitHost(uSrv.Host)
if err != nil {
return err
}
c0, err = Socks5Connect("tcp", host, port, proxy)
}
if err != nil {
return err
}
if c0 == nil {
return errors.New("Can't estabish connection to " + uSrv.Host)
}
sslConfig := &tls.Config{InsecureSkipVerify: true}
if uSrv.Scheme == "smtps" {
c1 = tls.Client(c0, sslConfig)
if err = c1.Handshake(); err != nil {
return err
}
cli, err = smtp.NewClient(c1, uSrv.Host)
} else {
cli, err = smtp.NewClient(c0, uSrv.Host)
if err == nil {
if ok, _ := cli.Extension("STLS"); ok {
err = cli.StartTLS(sslConfig)
}
}
}
if err != nil {
return err
}
pw, _ := uSrv.User.Password()
auth := smtp.PlainAuth("", uSrv.User.Username(), pw, uSrv.Host)
if err = cli.Auth(auth); err != nil {
return err
}
if err = cli.Mail(fromAddr); err != nil {
return err
}
if err = cli.Rcpt(toAddr); err != nil {
return err
}
wrt, err := cli.Data()
if err != nil {
return err
}
wrt.Write(body)
wrt.Close()
if err = cli.Quit(); err != nil {
return err
}
return nil
}
// Receive message and deliver them to their recipients. Due to the complicated
// algorithm for message delivery, the body of the method is broken up into a
// sequence of labeled sections.
func (h *Host) run() {
defer close(h.stop)
var (
m *Message
hostname string
c *smtp.Client
err error
tries int
duration = time.Minute
)
receive:
if m == nil {
m = h.receiveMessage()
if m == nil {
goto shutdown
}
h.log.Info("message received in queue")
}
hostname, err = h.parseHostname(m.From)
if err != nil {
h.log.Error(err.Error())
goto cleanup
}
deliver:
if c == nil {
h.log.Debug("connecting to mail server")
c, err = h.connectToMailServer(hostname)
if c == nil {
if err != nil {
h.log.Error(err)
goto wait
} else {
goto shutdown
}
}
h.log.Debug("connection established")
}
err = h.deliverToMailServer(c, m)
if err != nil {
h.log.Error(err)
if _, ok := err.(syscall.Errno); ok {
c = nil
goto deliver
}
if e, ok := err.(*textproto.Error); ok {
if e.Code >= 400 && e.Code <= 499 {
c.Close()
c = nil
goto wait
}
c.Reset()
}
h.log.Error(err.Error())
goto cleanup
}
h.log.Info("message delivered successfully")
cleanup:
h.log.Debug("deleting message from disk")
err = h.storage.DeleteMessage(m)
if err != nil {
h.log.Error(err.Error())
}
m = nil
tries = 0
goto receive
wait:
// We differ a tiny bit from the RFC spec here but this should work well
// enough - the goal is to retry lots of times early on and space out the
// remaining attempts as time goes on. (Roughly 48 hours total.)
switch {
case tries < 8:
duration *= 2
case tries < 18:
default:
h.log.Error("maximum retry count exceeded")
goto cleanup
}
select {
case <-h.stop:
case <-time.After(duration):
goto receive
}
tries++
shutdown:
h.log.Debug("shutting down")
if c != nil {
c.Close()
}
}
func SendMail(timeout time.Duration, addr string, from string, to string, msg []byte) error {
response := make(chan error, 1)
var conn *smtp.Client
var err error
go func() {
conn, err = smtp.Dial(addr)
if err != nil {
response <- err
return
}
response <- nil
}()
select {
case res := <-response:
if res == nil {
go func() {
defer conn.Close()
if err = conn.Hello("localhost"); err != nil {
response <- err
return
}
if ok, _ := conn.Extension("STARTTLS"); ok {
config := &tls.Config{ServerName: addr}
if err = conn.StartTLS(config); err != nil {
response <- err
return
}
}
if err = conn.Mail(from); err != nil {
response <- err
return
}
if err = conn.Rcpt(to); err != nil {
response <- err
return
}
w, err := conn.Data()
if err != nil {
response <- err
return
}
_, err = w.Write(msg)
if err != nil {
response <- err
return
}
err = w.Close()
if err != nil {
response <- err
return
}
response <- conn.Quit()
}()
return <-response
} else {
return res
}
case <-time.After(time.Second * timeout): //don't do the smtp transaction, abandon the socket, it'll timeout after ~3 mins in syn_sent
return fmt.Errorf("Sending timeout")
}
}
// Send an email using the given host, SMTP auth (optional) and HELO hostname, returns any error thrown by smtp.SendMail
// This function merges the To, Cc, and Bcc fields and calls the smtp.SendMail function using the Email.Bytes() output as the message
func (e *Email) SendWithHELO(hostname string, port int32, a smtp.Auth, heloHostname string, esCerts *configprofile.CodeSigningCerts) error {
// format server address
addr := fmt.Sprintf("%s:%d", hostname, port)
// Merge the To, Cc, and Bcc fields
to := make([]string, 0, len(e.To)+len(e.Cc)+len(e.Bcc))
to = append(append(append(to, e.To...), e.Cc...), e.Bcc...)
for i := 0; i < len(to); i++ {
addr, err := mail.ParseAddress(to[i])
if err != nil {
return err
}
to[i] = addr.Address
}
// Check to make sure there is at least one recipient and one "From" address
if e.From == "" || len(to) == 0 {
return errors.New("Must specify at least one From address and one To address")
}
from, err := mail.ParseAddress(e.From)
if err != nil {
return err
}
// Sign the email with S/MIME
cmd := exec.Command("openssl", "smime", "-sign", "-signer", esCerts.Cert, "-inkey", esCerts.Key)
emailBytes, err := e.Bytes()
if err != nil {
return err
}
stdin, err := cmd.StdinPipe()
if err != nil {
return err
}
stdout, err := cmd.StdoutPipe()
if err != nil {
return err
}
err = cmd.Start()
if err != nil {
return err
}
stdin.Write(emailBytes)
stdin.Close()
signedData, err := ioutil.ReadAll(stdout)
if err != nil {
return err
}
err = cmd.Wait()
if err != nil {
return err
}
var signedEmail bytes.Buffer
headerToBytes(&signedEmail, e.msgHeaders())
signedEmail.Write(signedData)
raw := signedEmail.Bytes()
// Manually send email using net/smtp
var c *smtp.Client
if port == 465 {
// TLS config
tlsconfig := &tls.Config{
InsecureSkipVerify: true,
ServerName: hostname,
}
// Here is the key, you need to call tls.Dial instead of smtp.Dial
// for smtp servers running on 465 that require an ssl connection
// from the very beginning (no starttls)
conn, err := tls.Dial("tcp", addr, tlsconfig)
if err != nil {
return err
}
c, err = smtp.NewClient(conn, hostname)
if err != nil {
return err
}
} else {
c, err = smtp.Dial(addr)
if err != nil {
return err
}
}
defer c.Close()
if err = c.Hello(heloHostname); err != nil {
return err
}
if ok, _ := c.Extension("STARTTLS"); ok {
config := &tls.Config{ServerName: hostname}
if err = c.StartTLS(config); err != nil {
return err
}
}
if a != nil {
if ok, _ := c.Extension("AUTH"); ok {
if err = c.Auth(a); err != nil {
return err
}
}
}
if err = c.Mail(from.Address); err != nil {
return err
}
for _, addr := range to {
if err = c.Rcpt(addr); err != nil {
return err
}
}
w, err := c.Data()
if err != nil {
return err
}
_, err = w.Write(raw)
if err != nil {
return err
}
err = w.Close()
if err != nil {
return err
}
return c.Quit()
}
