446 lines
12 KiB
Go
446 lines
12 KiB
Go
// Copyright 2014 The Gogs Authors. All rights reserved.
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// Copyright 2017 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package mailer
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import (
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"bytes"
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"context"
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"crypto/tls"
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"fmt"
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"hash/fnv"
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"io"
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"net"
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"net/smtp"
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"os"
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"os/exec"
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"strings"
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"time"
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"code.gitea.io/gitea/modules/base"
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"code.gitea.io/gitea/modules/graceful"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/process"
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"code.gitea.io/gitea/modules/queue"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/templates"
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notify_service "code.gitea.io/gitea/services/notify"
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ntlmssp "github.com/Azure/go-ntlmssp"
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"github.com/jaytaylor/html2text"
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"gopkg.in/gomail.v2"
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)
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// Message mail body and log info
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type Message struct {
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Info string // Message information for log purpose.
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FromAddress string
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FromDisplayName string
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To string // Use only one recipient to prevent leaking of addresses
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ReplyTo string
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Subject string
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Date time.Time
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Body string
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Headers map[string][]string
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}
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// ToMessage converts a Message to gomail.Message
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func (m *Message) ToMessage() *gomail.Message {
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msg := gomail.NewMessage()
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msg.SetAddressHeader("From", m.FromAddress, m.FromDisplayName)
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msg.SetHeader("To", m.To)
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if m.ReplyTo != "" {
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msg.SetHeader("Reply-To", m.ReplyTo)
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}
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for header := range m.Headers {
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msg.SetHeader(header, m.Headers[header]...)
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}
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if len(setting.MailService.SubjectPrefix) > 0 {
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msg.SetHeader("Subject", setting.MailService.SubjectPrefix+" "+m.Subject)
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} else {
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msg.SetHeader("Subject", m.Subject)
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}
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msg.SetDateHeader("Date", m.Date)
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msg.SetHeader("X-Auto-Response-Suppress", "All")
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plainBody, err := html2text.FromString(m.Body)
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if err != nil || setting.MailService.SendAsPlainText {
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if strings.Contains(base.TruncateString(m.Body, 100), "<html>") {
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log.Warn("Mail contains HTML but configured to send as plain text.")
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}
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msg.SetBody("text/plain", plainBody)
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} else {
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msg.SetBody("text/plain", plainBody)
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msg.AddAlternative("text/html", m.Body)
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}
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if len(msg.GetHeader("Message-ID")) == 0 {
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msg.SetHeader("Message-ID", m.generateAutoMessageID())
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}
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return msg
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}
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// SetHeader adds additional headers to a message
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func (m *Message) SetHeader(field string, value ...string) {
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m.Headers[field] = value
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}
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func (m *Message) generateAutoMessageID() string {
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dateMs := m.Date.UnixNano() / 1e6
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h := fnv.New64()
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if len(m.To) > 0 {
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_, _ = h.Write([]byte(m.To))
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}
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_, _ = h.Write([]byte(m.Subject))
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_, _ = h.Write([]byte(m.Body))
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return fmt.Sprintf("<autogen-%d-%016x@%s>", dateMs, h.Sum64(), setting.Domain)
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}
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// NewMessageFrom creates new mail message object with custom From header.
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func NewMessageFrom(to, fromDisplayName, fromAddress, subject, body string) *Message {
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log.Trace("NewMessageFrom (body):\n%s", body)
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return &Message{
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FromAddress: fromAddress,
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FromDisplayName: fromDisplayName,
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To: to,
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Subject: subject,
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Date: time.Now(),
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Body: body,
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Headers: map[string][]string{},
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}
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}
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// NewMessage creates new mail message object with default From header.
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func NewMessage(to, subject, body string) *Message {
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return NewMessageFrom(to, setting.MailService.FromName, setting.MailService.FromEmail, subject, body)
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}
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type loginAuth struct {
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username, password string
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}
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// LoginAuth SMTP AUTH LOGIN Auth Handler
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func LoginAuth(username, password string) smtp.Auth {
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return &loginAuth{username, password}
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}
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// Start start SMTP login auth
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func (a *loginAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
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return "LOGIN", []byte{}, nil
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}
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// Next next step of SMTP login auth
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func (a *loginAuth) Next(fromServer []byte, more bool) ([]byte, error) {
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if more {
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switch string(fromServer) {
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case "Username:":
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return []byte(a.username), nil
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case "Password:":
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return []byte(a.password), nil
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default:
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return nil, fmt.Errorf("unknown fromServer: %s", string(fromServer))
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}
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}
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return nil, nil
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}
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type ntlmAuth struct {
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username, password, domain string
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domainNeeded bool
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}
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// NtlmAuth SMTP AUTH NTLM Auth Handler
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func NtlmAuth(username, password string) smtp.Auth {
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user, domain, domainNeeded := ntlmssp.GetDomain(username)
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return &ntlmAuth{user, password, domain, domainNeeded}
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}
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// Start starts SMTP NTLM Auth
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func (a *ntlmAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
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negotiateMessage, err := ntlmssp.NewNegotiateMessage(a.domain, "")
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return "NTLM", negotiateMessage, err
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}
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// Next next step of SMTP ntlm auth
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func (a *ntlmAuth) Next(fromServer []byte, more bool) ([]byte, error) {
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if more {
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if len(fromServer) == 0 {
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return nil, fmt.Errorf("ntlm ChallengeMessage is empty")
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}
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authenticateMessage, err := ntlmssp.ProcessChallenge(fromServer, a.username, a.password, a.domainNeeded)
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return authenticateMessage, err
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}
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return nil, nil
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}
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// Sender SMTP mail sender
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type smtpSender struct{}
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// Send send email
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func (s *smtpSender) Send(from string, to []string, msg io.WriterTo) error {
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opts := setting.MailService
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var network string
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var address string
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if opts.Protocol == "smtp+unix" {
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network = "unix"
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address = opts.SMTPAddr
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} else {
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network = "tcp"
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address = net.JoinHostPort(opts.SMTPAddr, opts.SMTPPort)
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}
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conn, err := net.Dial(network, address)
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if err != nil {
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return fmt.Errorf("failed to establish network connection to SMTP server: %w", err)
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}
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defer conn.Close()
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var tlsconfig *tls.Config
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if opts.Protocol == "smtps" || opts.Protocol == "smtp+starttls" {
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tlsconfig = &tls.Config{
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InsecureSkipVerify: opts.ForceTrustServerCert,
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ServerName: opts.SMTPAddr,
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}
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if opts.UseClientCert {
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cert, err := tls.LoadX509KeyPair(opts.ClientCertFile, opts.ClientKeyFile)
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if err != nil {
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return fmt.Errorf("could not load SMTP client certificate: %w", err)
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}
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tlsconfig.Certificates = []tls.Certificate{cert}
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}
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}
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if opts.Protocol == "smtps" {
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conn = tls.Client(conn, tlsconfig)
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}
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host := "localhost"
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if opts.Protocol == "smtp+unix" {
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host = opts.SMTPAddr
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}
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client, err := smtp.NewClient(conn, host)
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if err != nil {
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return fmt.Errorf("could not initiate SMTP session: %w", err)
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}
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if opts.EnableHelo {
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hostname := opts.HeloHostname
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if len(hostname) == 0 {
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hostname, err = os.Hostname()
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if err != nil {
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return fmt.Errorf("could not retrieve system hostname: %w", err)
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}
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}
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if err = client.Hello(hostname); err != nil {
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return fmt.Errorf("failed to issue HELO command: %w", err)
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}
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}
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if opts.Protocol == "smtp+starttls" {
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hasStartTLS, _ := client.Extension("STARTTLS")
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if hasStartTLS {
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if err = client.StartTLS(tlsconfig); err != nil {
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return fmt.Errorf("failed to start TLS connection: %w", err)
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}
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} else {
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log.Warn("StartTLS requested, but SMTP server does not support it; falling back to regular SMTP")
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}
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}
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canAuth, options := client.Extension("AUTH")
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if len(opts.User) > 0 {
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if !canAuth {
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return fmt.Errorf("SMTP server does not support AUTH, but credentials provided")
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}
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var auth smtp.Auth
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if strings.Contains(options, "CRAM-MD5") {
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auth = smtp.CRAMMD5Auth(opts.User, opts.Passwd)
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} else if strings.Contains(options, "PLAIN") {
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auth = smtp.PlainAuth("", opts.User, opts.Passwd, host)
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} else if strings.Contains(options, "LOGIN") {
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// Patch for AUTH LOGIN
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auth = LoginAuth(opts.User, opts.Passwd)
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} else if strings.Contains(options, "NTLM") {
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auth = NtlmAuth(opts.User, opts.Passwd)
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}
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if auth != nil {
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if err = client.Auth(auth); err != nil {
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return fmt.Errorf("failed to authenticate SMTP: %w", err)
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}
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}
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}
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if opts.OverrideEnvelopeFrom {
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if err = client.Mail(opts.EnvelopeFrom); err != nil {
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return fmt.Errorf("failed to issue MAIL command: %w", err)
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}
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} else {
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if err = client.Mail(from); err != nil {
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return fmt.Errorf("failed to issue MAIL command: %w", err)
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}
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}
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for _, rec := range to {
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if err = client.Rcpt(rec); err != nil {
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return fmt.Errorf("failed to issue RCPT command: %w", err)
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}
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}
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w, err := client.Data()
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if err != nil {
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return fmt.Errorf("failed to issue DATA command: %w", err)
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} else if _, err = msg.WriteTo(w); err != nil {
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return fmt.Errorf("SMTP write failed: %w", err)
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} else if err = w.Close(); err != nil {
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return fmt.Errorf("SMTP close failed: %w", err)
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}
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return client.Quit()
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}
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// Sender sendmail mail sender
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type sendmailSender struct{}
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// Send send email
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func (s *sendmailSender) Send(from string, to []string, msg io.WriterTo) error {
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var err error
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var closeError error
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var waitError error
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envelopeFrom := from
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if setting.MailService.OverrideEnvelopeFrom {
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envelopeFrom = setting.MailService.EnvelopeFrom
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}
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args := []string{"-f", envelopeFrom, "-i"}
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args = append(args, setting.MailService.SendmailArgs...)
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args = append(args, to...)
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log.Trace("Sending with: %s %v", setting.MailService.SendmailPath, args)
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desc := fmt.Sprintf("SendMail: %s %v", setting.MailService.SendmailPath, args)
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ctx, _, finished := process.GetManager().AddContextTimeout(graceful.GetManager().HammerContext(), setting.MailService.SendmailTimeout, desc)
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defer finished()
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cmd := exec.CommandContext(ctx, setting.MailService.SendmailPath, args...)
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pipe, err := cmd.StdinPipe()
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if err != nil {
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return err
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}
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process.SetSysProcAttribute(cmd)
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if err = cmd.Start(); err != nil {
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_ = pipe.Close()
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return err
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}
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if setting.MailService.SendmailConvertCRLF {
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buf := &strings.Builder{}
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_, err = msg.WriteTo(buf)
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if err == nil {
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_, err = strings.NewReplacer("\r\n", "\n").WriteString(pipe, buf.String())
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}
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} else {
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_, err = msg.WriteTo(pipe)
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}
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// we MUST close the pipe or sendmail will hang waiting for more of the message
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// Also we should wait on our sendmail command even if something fails
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closeError = pipe.Close()
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waitError = cmd.Wait()
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if err != nil {
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return err
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} else if closeError != nil {
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return closeError
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} else {
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return waitError
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}
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}
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// Sender sendmail mail sender
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type dummySender struct{}
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// Send send email
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func (s *dummySender) Send(from string, to []string, msg io.WriterTo) error {
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buf := bytes.Buffer{}
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if _, err := msg.WriteTo(&buf); err != nil {
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return err
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}
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log.Info("Mail From: %s To: %v Body: %s", from, to, buf.String())
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return nil
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}
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var mailQueue *queue.WorkerPoolQueue[*Message]
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// Sender sender for sending mail synchronously
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var Sender gomail.Sender
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// NewContext start mail queue service
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func NewContext(ctx context.Context) {
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// Need to check if mailQueue is nil because in during reinstall (user had installed
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// before but switched install lock off), this function will be called again
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// while mail queue is already processing tasks, and produces a race condition.
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if setting.MailService == nil || mailQueue != nil {
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return
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}
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if setting.Service.EnableNotifyMail {
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notify_service.RegisterNotifier(NewNotifier())
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}
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switch setting.MailService.Protocol {
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case "sendmail":
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Sender = &sendmailSender{}
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case "dummy":
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Sender = &dummySender{}
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default:
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Sender = &smtpSender{}
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}
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subjectTemplates, bodyTemplates = templates.Mailer(ctx)
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mailQueue = queue.CreateSimpleQueue(graceful.GetManager().ShutdownContext(), "mail", func(items ...*Message) []*Message {
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for _, msg := range items {
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gomailMsg := msg.ToMessage()
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log.Trace("New e-mail sending request %s: %s", gomailMsg.GetHeader("To"), msg.Info)
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if err := gomail.Send(Sender, gomailMsg); err != nil {
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log.Error("Failed to send emails %s: %s - %v", gomailMsg.GetHeader("To"), msg.Info, err)
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} else {
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log.Trace("E-mails sent %s: %s", gomailMsg.GetHeader("To"), msg.Info)
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}
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}
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return nil
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})
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if mailQueue == nil {
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log.Fatal("Unable to create mail queue")
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}
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go graceful.GetManager().RunWithCancel(mailQueue)
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}
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// SendAsync send mail asynchronously
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func SendAsync(msg *Message) {
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SendAsyncs([]*Message{msg})
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}
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// SendAsyncs send mails asynchronously
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func SendAsyncs(msgs []*Message) {
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if setting.MailService == nil {
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log.Error("Mailer: SendAsyncs is being invoked but mail service hasn't been initialized")
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return
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}
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go func() {
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for _, msg := range msgs {
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_ = mailQueue.Push(msg)
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}
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}()
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}
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