forked from Silverfish/proton-bridge
2bda47fcad
Instead of the annoying safe.Map type, we just use a normal go map and mutex pair, and use safe.Lock/safe.RLock as a helper function
101 lines
3.1 KiB
Go
101 lines
3.1 KiB
Go
// Copyright (c) 2022 Proton AG
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//
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// This file is part of Proton Mail Bridge.
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//
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// Proton Mail 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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// Proton Mail 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 Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package bridge
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import (
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"context"
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"crypto/tls"
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"fmt"
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"github.com/ProtonMail/proton-bridge/v2/internal/logging"
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"github.com/ProtonMail/proton-bridge/v2/internal/constants"
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"github.com/emersion/go-smtp"
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"github.com/sirupsen/logrus"
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)
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func (bridge *Bridge) serveSMTP() error {
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smtpListener, err := newListener(bridge.vault.GetSMTPPort(), bridge.vault.GetSMTPSSL(), bridge.tlsConfig)
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if err != nil {
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return fmt.Errorf("failed to create SMTP listener: %w", err)
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}
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bridge.smtpListener = smtpListener
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bridge.tasks.Once(func(ctx context.Context) {
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if err := bridge.smtpServer.Serve(smtpListener); err != nil {
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logrus.WithError(err).Debug("SMTP server stopped")
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}
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})
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if err := bridge.vault.SetSMTPPort(getPort(smtpListener.Addr())); err != nil {
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return fmt.Errorf("failed to set IMAP port: %w", err)
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}
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return nil
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}
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func (bridge *Bridge) restartSMTP() error {
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if err := bridge.closeSMTP(); err != nil {
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return fmt.Errorf("failed to close SMTP: %w", err)
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}
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bridge.smtpServer = newSMTPServer(bridge, bridge.tlsConfig, bridge.logSMTP)
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return bridge.serveSMTP()
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}
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// We close the listener ourselves even though it's also closed by smtpServer.Close().
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// This is because smtpServer.Serve() is called in a separate goroutine and might be executed
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// after we've already closed the server. However, go-smtp has a bug; it blocks on the listener
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// even after the server has been closed. So we close the listener ourselves to unblock it.
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func (bridge *Bridge) closeSMTP() error {
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if bridge.smtpListener != nil {
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if err := bridge.smtpListener.Close(); err != nil {
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return fmt.Errorf("failed to close SMTP listener: %w", err)
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}
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}
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if err := bridge.smtpServer.Close(); err != nil {
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logrus.WithError(err).Debug("Failed to close SMTP server")
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}
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return nil
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}
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func newSMTPServer(bridge *Bridge, tlsConfig *tls.Config, shouldLog bool) *smtp.Server {
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smtpServer := smtp.NewServer(&smtpBackend{Bridge: bridge})
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smtpServer.TLSConfig = tlsConfig
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smtpServer.Domain = constants.Host
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smtpServer.AllowInsecureAuth = true
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smtpServer.MaxLineLength = 1 << 16
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smtpServer.ErrorLog = logging.NewSMTPLogger()
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if shouldLog {
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log := logrus.WithField("protocol", "SMTP")
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log.Warning("================================================")
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log.Warning("THIS LOG WILL CONTAIN **DECRYPTED** MESSAGE DATA")
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log.Warning("================================================")
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smtpServer.Debug = logging.NewSMTPDebugLogger()
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}
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return smtpServer
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}
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