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server.go
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server.go
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package main
import (
"crypto/tls"
"fmt"
"github.com/emersion/go-imap/server"
"github.com/emersion/go-smtp"
"github.com/foxcpp/go-imap-namespace"
"github.com/patrick246/imap/backend/mongodb"
"github.com/patrick246/imap/certificatehandler"
"github.com/patrick246/imap/config"
"github.com/patrick246/imap/connection/ldap"
"github.com/patrick246/imap/connection/mongodbConnection"
"github.com/patrick246/imap/lmtp"
"github.com/patrick246/imap/observability/logging"
"github.com/patrick246/imap/repository"
"github.com/spf13/viper"
"go.uber.org/zap"
"os"
"os/signal"
"syscall"
)
var log *zap.SugaredLogger
func main() {
err := config.Init()
if err != nil {
fmt.Printf("Could not load config: %v", err)
panic(err)
}
log = logging.CreateLogger("imap-server")
ldapConn, err := connectToLdap()
if err != nil {
log.Fatal("ldap connection error", "error", err)
}
uri := config.GetString("mongodb.uri", "mongodb://localhost:27017/mail?replicaSet=rs0")
dbConnection, err := mongodbConnection.NewConnection(uri)
if err != nil {
log.Fatalw("database connection error", "error", err)
}
userRepo, err := repository.NewUserRepository(dbConnection)
if err != nil {
log.Fatalw("user repository setup error", "error", err)
}
mailboxRepo, err := repository.NewMailboxRepository(dbConnection)
if err != nil {
log.Fatalw("mailbox repository setup error", "error", err)
}
messageRepo, err := repository.NewMessageRepository(dbConnection)
if err != nil {
log.Fatalw("message repository setup error", "error", err)
}
tlsConfig, err := buildTlsConfig("imaps")
if err != nil {
log.Fatalw("error building tls config", "error", err)
}
be := mongodb.New(ldapConn, userRepo, mailboxRepo, messageRepo)
// Create a new server
imapServer := server.New(be)
imapServer.AllowInsecureAuth = viper.GetBool("server.imap.allowInsecureAuth")
imapServer.TLSConfig = tlsConfig
imapServer.ErrorLog = logging.ImapAdapter{Logger: logging.CreateLogger("go-imap")}
imapServer.Enable(namespace.NewExtension())
imapServer.Debug = os.Stdout
go func() {
imapServer.Addr = config.GetString("server.imap.address", ":1143")
log.Infow("starting imap server", "address", imapServer.Addr)
if err := imapServer.ListenAndServe(); err != nil {
log.Fatal(err)
}
}()
go func() {
imapServer.Addr = config.GetString("server.imaps.address", ":1993")
log.Infow("starting imaps server", "address", imapServer.Addr)
if err := imapServer.ListenAndServeTLS(); err != nil {
log.Fatal(err)
}
}()
lmtpTlsConfig, err := buildTlsConfig("lmtps")
if err != nil {
log.Fatalw("error building tls config", "server", "lmtps", "error", err)
}
var lmtpConfig lmtp.Config
err = viper.UnmarshalKey("server.lmtp", &lmtpConfig)
if err != nil {
log.Fatalw("error getting lmtp config", "server", "lmtp", "error", err)
}
lmtpBackend, err := lmtp.NewBackend(lmtpConfig, ldapConn, mailboxRepo, messageRepo, userRepo)
if err != nil {
log.Fatalw("error creating lmtp backend", "server", "lmtp", "error", err)
}
lmtpServer := smtp.NewServer(lmtpBackend)
lmtpServer.LMTP = true
lmtpServer.AuthDisabled = true
lmtpServer.TLSConfig = lmtpTlsConfig
lmtpServer.Debug = os.Stderr
lmtpServer.ErrorLog = logging.ImapAdapter{Logger: logging.CreateLogger("go-smtp")}
go func() {
lmtpServer.Addr = config.GetString("server.lmtp.address", ":24")
lmtpServer.Network = config.GetString("server.lmtp.network", "tcp")
log.Infow("starting lmtp server", "address", lmtpServer.Addr)
if err := lmtpServer.ListenAndServe(); err != nil {
log.Fatal(err)
}
}()
go func() {
lmtpServer.Addr = config.GetString("server.lmtps.address", ":2424")
log.Infow("starting lmtps server", "address", lmtpServer.Addr)
if err := lmtpServer.ListenAndServeTLS(); err != nil {
log.Fatal(err)
}
}()
signals := make(chan os.Signal)
signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM)
<-signals
log.Info("shutting down servers")
err = imapServer.Close()
if err != nil {
log.Fatalw("failed to close server", "error", err)
}
}
func connectToLdap() (*ldap.Connection, error) {
var ldapConnInfo ldap.ConnectionInfo
err := viper.UnmarshalKey("ldap", &ldapConnInfo)
if err != nil {
log.Errorw("error loading ldap config, using default", "error", err)
return nil, err
}
log.Infow("connecting to ldap",
"host", ldapConnInfo.Hostname,
"port", ldapConnInfo.Port,
"binddn", ldapConnInfo.Username)
return ldap.Connect(ldapConnInfo)
}
func buildTlsConfig(server string) (*tls.Config, error) {
cipherSuiteMap := make(map[string]uint16)
for _, suite := range tls.CipherSuites() {
cipherSuiteMap[suite.Name] = suite.ID
}
enabledSuitesString := viper.GetStringSlice("server.tls.cipherSuites")
var enabledSuites []uint16
for _, enabledSuiteString := range enabledSuitesString {
enabledSuites = append(enabledSuites, cipherSuiteMap[enabledSuiteString])
}
loader, err := certificatehandler.New(
config.GetString("server."+server+".tls.certificate", config.GetString("server.tls.certificate", "tls/tls.crt")),
config.GetString("server."+server+".tls.key", config.GetString("server.tls.key", "tls/tls.key")),
)
if err != nil {
return nil, err
}
minVersionStr := config.GetString("server.tls.minVersion", "1.2")
minVersion := uint16(tls.VersionTLS12)
switch minVersionStr {
case "1.0":
minVersion = tls.VersionTLS10
case "1.1":
minVersion = tls.VersionTLS11
case "1.2":
minVersion = tls.VersionTLS12
case "1.3":
minVersion = tls.VersionTLS13
}
return &tls.Config{
GetCertificate: loader.CertificateLoaderFunc(),
CipherSuites: enabledSuites,
MinVersion: minVersion,
NextProtos: []string{"imap"},
PreferServerCipherSuites: viper.GetBool("server.tls.serverCipherSuiteOrder"),
}, nil
}