mirror of
https://gitlab.com/ric_harvey/MailHog.git
synced 2024-11-24 14:54:03 +00:00
257 lines
7 KiB
Go
257 lines
7 KiB
Go
package smtp
|
|
|
|
// http://www.rfc-editor.org/rfc/rfc5321.txt
|
|
|
|
import (
|
|
"log"
|
|
"net"
|
|
"strings"
|
|
"regexp"
|
|
"errors"
|
|
"github.com/ian-kent/MailHog/mailhog/config"
|
|
"github.com/ian-kent/MailHog/mailhog/storage"
|
|
"github.com/ian-kent/MailHog/mailhog/data"
|
|
)
|
|
|
|
type Session struct {
|
|
conn *net.TCPConn
|
|
line string
|
|
conf *config.Config
|
|
state int
|
|
message *data.SMTPMessage
|
|
isTLS bool
|
|
}
|
|
|
|
const (
|
|
ESTABLISH = iota
|
|
AUTH
|
|
AUTH2
|
|
MAIL
|
|
RCPT
|
|
DATA
|
|
DONE
|
|
)
|
|
|
|
// TODO replace ".." lines with . in data
|
|
|
|
func StartSession(conn *net.TCPConn, conf *config.Config) {
|
|
conv := &Session{conn, "", conf, ESTABLISH, &data.SMTPMessage{}, false}
|
|
conv.log("Starting session")
|
|
conv.Write("220", conv.conf.Hostname + " ESMTP Go-MailHog")
|
|
conv.Read()
|
|
}
|
|
|
|
func (c *Session) log(message string, args ...interface{}) {
|
|
message = strings.Join([]string{"[SMTP %s, %d]", message}, " ")
|
|
args = append([]interface{}{c.conn.RemoteAddr(), c.state}, args...)
|
|
log.Printf(message, args...)
|
|
}
|
|
|
|
func (c *Session) Read() {
|
|
buf := make([]byte, 1024)
|
|
n, err := c.conn.Read(buf)
|
|
|
|
if n == 0 {
|
|
c.log("Connection closed by remote host\n")
|
|
return
|
|
}
|
|
if err != nil {
|
|
c.log("Error reading from socket: %s\n", err)
|
|
return
|
|
}
|
|
|
|
text := string(buf[0:n])
|
|
c.log("Received %d bytes: '%s'\n", n, text)
|
|
|
|
c.line += text
|
|
|
|
c.Parse()
|
|
}
|
|
|
|
func (c *Session) Parse() {
|
|
for strings.Contains(c.line, "\n") {
|
|
parts := strings.SplitN(c.line, "\n", 2)
|
|
if len(parts) == 2 {
|
|
c.line = parts[1]
|
|
} else {
|
|
c.line = ""
|
|
}
|
|
if c.state == DATA {
|
|
c.message.Data += parts[0] + "\n"
|
|
if(strings.HasSuffix(c.message.Data, "\r\n.\r\n")) {
|
|
c.log("Got EOF, storing message and switching to MAIL state")
|
|
//c.log("Full message data: %s", c.message.Data)
|
|
c.message.Data = strings.TrimSuffix(c.message.Data, "\r\n.\r\n")
|
|
msg := data.ParseSMTPMessage(c.message, c.conf.Hostname)
|
|
var id string
|
|
var err error
|
|
switch c.conf.Storage.(type) {
|
|
case *storage.MongoDB:
|
|
c.log("Storing message using MongoDB")
|
|
id, err = c.conf.Storage.(*storage.MongoDB).Store(msg)
|
|
case *storage.Memory:
|
|
c.log("Storing message using Memory")
|
|
id, err = c.conf.Storage.(*storage.Memory).Store(msg)
|
|
default:
|
|
c.log("Unknown storage type")
|
|
// TODO send error reply
|
|
}
|
|
c.state = MAIL
|
|
if err != nil {
|
|
c.log("Error storing message: %s", err)
|
|
c.Write("452", "Unable to store message")
|
|
return
|
|
}
|
|
c.Write("250", "Ok: queued as " + id)
|
|
c.conf.MessageChan <- msg
|
|
}
|
|
} else {
|
|
c.Process(strings.Trim(parts[0], "\r\n"))
|
|
}
|
|
}
|
|
|
|
c.Read()
|
|
}
|
|
|
|
func (c *Session) Write(code string, text ...string) {
|
|
if len(text) == 1 {
|
|
c.log("Sent %d bytes: '%s'", len(text[0] + "\n"), text[0] + "\n")
|
|
c.conn.Write([]byte(code + " " + text[0] + "\n"))
|
|
return
|
|
}
|
|
for i := 0; i < len(text) - 1; i++ {
|
|
c.log("Sent %d bytes: '%s'", len(text[i] + "\n"), text[i] + "\n")
|
|
c.conn.Write([]byte(code + "-" + text[i] + "\n"))
|
|
}
|
|
c.log("Sent %d bytes: '%s'", len(text[len(text)-1] + "\n"), text[len(text)-1] + "\n")
|
|
c.conn.Write([]byte(code + " " + text[len(text)-1] + "\n"))
|
|
}
|
|
|
|
func (c *Session) Process(line string) {
|
|
c.log("Processing line: %s", line)
|
|
|
|
words := strings.Split(line, " ")
|
|
command := words[0]
|
|
args := strings.Join(words[1:len(words)], " ")
|
|
c.log("In state %d, got command '%s', args '%s'", c.state, command, args)
|
|
|
|
switch {
|
|
case command == "RSET":
|
|
c.log("Got RSET command, switching to ESTABLISH state")
|
|
c.state = ESTABLISH
|
|
c.message = &data.SMTPMessage{}
|
|
c.Write("250", "Ok")
|
|
case command == "NOOP":
|
|
c.log("Got NOOP command")
|
|
c.Write("250", "Ok")
|
|
case command == "QUIT":
|
|
c.log("Got QUIT command")
|
|
c.Write("221", "Bye")
|
|
err := c.conn.Close()
|
|
if err != nil {
|
|
c.log("Error closing connection")
|
|
}
|
|
case c.state == ESTABLISH:
|
|
switch command {
|
|
case "HELO":
|
|
c.log("Got HELO command, switching to MAIL state")
|
|
c.state = MAIL
|
|
c.message.Helo = args
|
|
c.Write("250", "Hello " + args)
|
|
case "EHLO":
|
|
c.log("Got EHLO command, switching to MAIL state")
|
|
c.state = MAIL
|
|
c.message.Helo = args
|
|
c.Write("250", "Hello " + args, "PIPELINING", "AUTH EXTERNAL CRAM-MD5 LOGIN PLAIN")
|
|
default:
|
|
c.log("Got unknown command for ESTABLISH state: '%s'", command)
|
|
c.Write("500", "Unrecognised command")
|
|
}
|
|
case c.state == AUTH:
|
|
c.log("Got authentication response: '%s', switching to MAIL state", args)
|
|
c.state = MAIL
|
|
c.Write("235", "Authentication successful")
|
|
case c.state == AUTH2:
|
|
c.log("Got LOGIN authentication response: '%s', switching to AUTH state", args)
|
|
c.state = AUTH
|
|
c.Write("334", "UGFzc3dvcmQ6")
|
|
case c.state == MAIL: // TODO rename/split state
|
|
switch command {
|
|
case "AUTH":
|
|
c.log("Got AUTH command, staying in MAIL state")
|
|
switch {
|
|
case strings.HasPrefix(args, "PLAIN "):
|
|
c.log("Got PLAIN authentication: %s", strings.TrimPrefix(args, "PLAIN "))
|
|
c.Write("235", "Authentication successful")
|
|
case args == "LOGIN":
|
|
c.log("Got LOGIN authentication, switching to AUTH state")
|
|
c.state = AUTH2
|
|
c.Write("334", "VXNlcm5hbWU6")
|
|
case args == "PLAIN":
|
|
c.log("Got PLAIN authentication (no args), switching to AUTH2 state")
|
|
c.state = AUTH
|
|
c.Write("334", "")
|
|
case args == "CRAM-MD5":
|
|
c.log("Got CRAM-MD5 authentication, switching to AUTH state")
|
|
c.state = AUTH
|
|
c.Write("334", "PDQxOTI5NDIzNDEuMTI4Mjg0NzJAc291cmNlZm91ci5hbmRyZXcuY211LmVkdT4=")
|
|
case strings.HasPrefix(args, "EXTERNAL "):
|
|
c.log("Got EXTERNAL authentication: %s", strings.TrimPrefix(args, "EXTERNAL "))
|
|
c.Write("235", "Authentication successful")
|
|
default:
|
|
c.Write("504", "Unsupported authentication mechanism")
|
|
}
|
|
case "MAIL":
|
|
c.log("Got MAIL command, switching to RCPT state")
|
|
from, err := ParseMAIL(args)
|
|
if err != nil {
|
|
c.Write("550", err.Error())
|
|
return
|
|
}
|
|
c.message.From = from
|
|
c.state = RCPT
|
|
c.Write("250", "Sender " + from + " ok")
|
|
default:
|
|
c.log("Got unknown command for MAIL state: '%s'", command)
|
|
c.Write("500", "Unrecognised command")
|
|
}
|
|
case c.state == RCPT:
|
|
switch command {
|
|
case "RCPT":
|
|
c.log("Got RCPT command")
|
|
to, err := ParseRCPT(args)
|
|
if err != nil {
|
|
c.Write("550", err.Error())
|
|
return
|
|
}
|
|
c.message.To = append(c.message.To, to)
|
|
c.state = RCPT
|
|
c.Write("250", "Recipient " + to + " ok")
|
|
case "DATA":
|
|
c.log("Got DATA command, switching to DATA state")
|
|
c.state = DATA
|
|
c.Write("354", "End data with <CR><LF>.<CR><LF>")
|
|
default:
|
|
c.log("Got unknown command for RCPT state: '%s'", command)
|
|
c.Write("500", "Unrecognised command")
|
|
}
|
|
}
|
|
}
|
|
|
|
func ParseMAIL(mail string) (string, error) {
|
|
r := regexp.MustCompile("(?i:From):<([^>]+)>")
|
|
match := r.FindStringSubmatch(mail)
|
|
if(len(match) != 2) {
|
|
return "", errors.New("Invalid sender")
|
|
}
|
|
return match[1], nil;
|
|
}
|
|
|
|
func ParseRCPT(rcpt string) (string, error) {
|
|
r := regexp.MustCompile("(?i:To):<([^>]+)>")
|
|
match := r.FindStringSubmatch(rcpt)
|
|
if(len(match) != 2) {
|
|
return "", errors.New("Invalid recipient")
|
|
}
|
|
return match[1], nil;
|
|
}
|