mirror of
https://github.com/ProtonMail/proton-bridge.git
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ff288145df
If a SMPT client keeps hammering bridge and triggers multiple successive errors in quick succession, force that client to wait 20 seconds before trying again.
142 lines
3.2 KiB
Go
142 lines
3.2 KiB
Go
// Copyright (c) 2023 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 smtp
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import (
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"context"
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"io"
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"sync"
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"time"
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)
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type Accounts struct {
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accountsLock sync.RWMutex
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accounts map[string]*smtpAccountState
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}
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const maxFailedCommands = 3
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const defaultErrTimeout = 20 * time.Second
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const successiveErrInterval = time.Second
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func NewAccounts() *Accounts {
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return &Accounts{
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accounts: make(map[string]*smtpAccountState),
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}
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}
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func (s *Accounts) AddAccount(account *Service) {
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s.accountsLock.Lock()
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defer s.accountsLock.Unlock()
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s.accounts[account.UserID()] = &smtpAccountState{
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service: account,
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errTimeout: defaultErrTimeout,
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}
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}
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func (s *Accounts) RemoveAccount(account *Service) {
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s.accountsLock.Lock()
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defer s.accountsLock.Unlock()
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delete(s.accounts, account.UserID())
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}
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func (s *Accounts) CheckAuth(user string, password []byte) (string, string, error) {
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s.accountsLock.RLock()
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defer s.accountsLock.RUnlock()
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for id, account := range s.accounts {
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addrID, err := account.service.checkAuth(context.Background(), user, password)
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if err != nil {
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continue
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}
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account.service.telemetry.ReportSMTPAuthSuccess(context.Background())
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return id, addrID, nil
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}
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for _, service := range s.accounts {
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service.service.telemetry.ReportSMTPAuthFailed(user)
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}
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return "", "", ErrNoSuchUser
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}
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func (s *Accounts) SendMail(ctx context.Context, userID, addrID, from string, to []string, r io.Reader) error {
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if len(to) == 0 {
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return ErrInvalidRecipient
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}
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s.accountsLock.RLock()
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defer s.accountsLock.RUnlock()
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requestTime := time.Now()
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account, ok := s.accounts[userID]
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if !ok {
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return ErrNoSuchUser
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}
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if err := account.canMakeRequest(requestTime); err != nil {
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return err
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}
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err := account.service.SendMail(ctx, addrID, from, to, r)
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account.handleSMTPErr(requestTime, err)
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return err
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}
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type smtpAccountState struct {
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service *Service
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errTimeout time.Duration
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errLock sync.Mutex
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errCounter int
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lastRequest time.Time
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}
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func (s *smtpAccountState) canMakeRequest(requestTime time.Time) error {
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s.errLock.Lock()
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defer s.errLock.Unlock()
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if s.errCounter >= maxFailedCommands {
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if requestTime.Sub(s.lastRequest) >= s.errTimeout {
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s.errCounter = 0
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return nil
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}
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return ErrTooManyErrors
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}
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return nil
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}
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func (s *smtpAccountState) handleSMTPErr(requestTime time.Time, err error) {
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s.errLock.Lock()
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defer s.errLock.Unlock()
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if err == nil || requestTime.Sub(s.lastRequest) > successiveErrInterval {
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s.errCounter = 0
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} else {
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s.errCounter++
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}
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s.lastRequest = requestTime
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}
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