You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
112 lines
3.0 KiB
112 lines
3.0 KiB
// Copyright (c) 2020 Proton Technologies AG |
|
// |
|
// This file is part of ProtonMail Bridge. |
|
// |
|
// ProtonMail Bridge is free software: you can redistribute it and/or modify |
|
// it under the terms of the GNU General Public License as published by |
|
// the Free Software Foundation, either version 3 of the License, or |
|
// (at your option) any later version. |
|
// |
|
// ProtonMail Bridge is distributed in the hope that it will be useful, |
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|
// GNU General Public License for more details. |
|
// |
|
// You should have received a copy of the GNU General Public License |
|
// along with ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>. |
|
|
|
package smtp |
|
|
|
import ( |
|
"crypto/tls" |
|
"fmt" |
|
|
|
"github.com/ProtonMail/proton-bridge/internal/bridge" |
|
"github.com/ProtonMail/proton-bridge/internal/events" |
|
"github.com/ProtonMail/proton-bridge/pkg/listener" |
|
"github.com/emersion/go-sasl" |
|
goSMTP "github.com/emersion/go-smtp" |
|
"github.com/sirupsen/logrus" |
|
) |
|
|
|
type smtpServer struct { |
|
server *goSMTP.Server |
|
eventListener listener.Listener |
|
useSSL bool |
|
} |
|
|
|
// NewSMTPServer returns an SMTP server configured with the given options. |
|
func NewSMTPServer(debug bool, port int, useSSL bool, tls *tls.Config, smtpBackend goSMTP.Backend, eventListener listener.Listener) *smtpServer { //nolint[golint] |
|
s := goSMTP.NewServer(smtpBackend) |
|
s.Addr = fmt.Sprintf("%v:%v", bridge.Host, port) |
|
s.TLSConfig = tls |
|
s.Domain = bridge.Host |
|
s.AllowInsecureAuth = true |
|
|
|
if debug { |
|
s.Debug = logrus. |
|
WithField("pkg", "smtp/server"). |
|
WriterLevel(logrus.DebugLevel) |
|
} |
|
|
|
s.EnableAuth(sasl.Login, func(conn *goSMTP.Conn) sasl.Server { |
|
return sasl.NewLoginServer(func(address, password string) error { |
|
user, err := conn.Server().Backend.Login(address, password) |
|
if err != nil { |
|
return err |
|
} |
|
|
|
conn.SetUser(user) |
|
return nil |
|
}) |
|
}) |
|
|
|
return &smtpServer{ |
|
server: s, |
|
eventListener: eventListener, |
|
useSSL: useSSL, |
|
} |
|
} |
|
|
|
// Starts the server. |
|
func (s *smtpServer) ListenAndServe() { |
|
go s.monitorDisconnectedUsers() |
|
l := log.WithField("useSSL", s.useSSL).WithField("address", s.server.Addr) |
|
|
|
l.Info("SMTP server is starting") |
|
var err error |
|
if s.useSSL { |
|
err = s.server.ListenAndServeTLS() |
|
} else { |
|
err = s.server.ListenAndServe() |
|
} |
|
if err != nil { |
|
s.eventListener.Emit(events.ErrorEvent, "SMTP failed: "+err.Error()) |
|
l.Error("SMTP failed: ", err) |
|
return |
|
} |
|
defer s.server.Close() |
|
|
|
l.Info("SMTP server stopped") |
|
} |
|
|
|
// Stops the server. |
|
func (s *smtpServer) Close() { |
|
s.server.Close() |
|
} |
|
|
|
func (s *smtpServer) monitorDisconnectedUsers() { |
|
ch := make(chan string) |
|
s.eventListener.Add(events.CloseConnectionEvent, ch) |
|
|
|
for address := range ch { |
|
log.Info("Disconnecting all open SMTP connections for ", address) |
|
disconnectUser := func(conn *goSMTP.Conn) { |
|
connUser := conn.User() |
|
if connUser != nil { |
|
_ = conn.Close() |
|
} |
|
} |
|
s.server.ForEachConn(disconnectUser) |
|
} |
|
}
|
|
|