mirror of
https://github.com/ProtonMail/proton-bridge.git
synced 2025-12-10 12:46:46 +00:00
113 lines
3.0 KiB
Go
113 lines
3.0 KiB
Go
// Copyright (c) 2020 Proton Technologies AG
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//
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// This file is part of ProtonMail Bridge.
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//
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// ProtonMail Bridge is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// ProtonMail Bridge is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package smtp
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import (
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"crypto/tls"
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"fmt"
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"github.com/ProtonMail/proton-bridge/internal/bridge"
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"github.com/ProtonMail/proton-bridge/internal/events"
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"github.com/ProtonMail/proton-bridge/pkg/listener"
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"github.com/emersion/go-sasl"
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goSMTP "github.com/emersion/go-smtp"
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"github.com/sirupsen/logrus"
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)
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type smtpServer struct {
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server *goSMTP.Server
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eventListener listener.Listener
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useSSL bool
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}
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// NewSMTPServer returns an SMTP server configured with the given options.
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func NewSMTPServer(debug bool, port int, useSSL bool, tls *tls.Config, smtpBackend goSMTP.Backend, eventListener listener.Listener) *smtpServer { //nolint[golint]
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s := goSMTP.NewServer(smtpBackend)
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s.Addr = fmt.Sprintf("%v:%v", bridge.Host, port)
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s.TLSConfig = tls
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s.Domain = bridge.Host
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s.AllowInsecureAuth = true
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if debug {
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s.Debug = logrus.
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WithField("pkg", "smtp/server").
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WriterLevel(logrus.DebugLevel)
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}
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s.EnableAuth(sasl.Login, func(conn *goSMTP.Conn) sasl.Server {
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return sasl.NewLoginServer(func(address, password string) error {
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user, err := conn.Server().Backend.Login(address, password)
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if err != nil {
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return err
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}
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conn.SetUser(user)
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return nil
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})
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})
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return &smtpServer{
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server: s,
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eventListener: eventListener,
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useSSL: useSSL,
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}
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}
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// Starts the server.
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func (s *smtpServer) ListenAndServe() {
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go s.monitorDisconnectedUsers()
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l := log.WithField("useSSL", s.useSSL).WithField("address", s.server.Addr)
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l.Info("SMTP server is starting")
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var err error
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if s.useSSL {
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err = s.server.ListenAndServeTLS()
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} else {
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err = s.server.ListenAndServe()
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}
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if err != nil {
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s.eventListener.Emit(events.ErrorEvent, "SMTP failed: "+err.Error())
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l.Error("SMTP failed: ", err)
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return
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}
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defer s.server.Close()
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l.Info("SMTP server stopped")
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}
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// Stops the server.
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func (s *smtpServer) Close() {
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s.server.Close()
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}
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func (s *smtpServer) monitorDisconnectedUsers() {
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ch := make(chan string)
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s.eventListener.Add(events.CloseConnectionEvent, ch)
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for address := range ch {
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log.Info("Disconnecting all open SMTP connections for ", address)
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disconnectUser := func(conn *goSMTP.Conn) {
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connUser := conn.User()
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if connUser != nil {
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_ = conn.Close()
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}
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}
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s.server.ForEachConn(disconnectUser)
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}
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}
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