mirror of
https://github.com/mjl-/mox.git
synced 2025-07-10 09:14:39 +03:00
mox!
This commit is contained in:
Mechiel Lukkien
351
serve.go
Normal file
351
serve.go
Normal file
@ -0,0 +1,351 @@
|
||||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
cryptorand "crypto/rand"
|
||||
"fmt"
|
||||
"net"
|
||||
"os"
|
||||
"os/signal"
|
||||
"path/filepath"
|
||||
"runtime/debug"
|
||||
"strconv"
|
||||
"strings"
|
||||
"sync"
|
||||
"syscall"
|
||||
"time"
|
||||
|
||||
"github.com/prometheus/client_golang/prometheus"
|
||||
"github.com/prometheus/client_golang/prometheus/promauto"
|
||||
|
||||
"github.com/mjl-/mox/dns"
|
||||
"github.com/mjl-/mox/dnsbl"
|
||||
"github.com/mjl-/mox/message"
|
||||
"github.com/mjl-/mox/metrics"
|
||||
"github.com/mjl-/mox/mlog"
|
||||
"github.com/mjl-/mox/mox-"
|
||||
"github.com/mjl-/mox/moxio"
|
||||
"github.com/mjl-/mox/moxvar"
|
||||
"github.com/mjl-/mox/store"
|
||||
"github.com/mjl-/mox/updates"
|
||||
)
|
||||
|
||||
func monitorDNSBL(log *mlog.Log) {
|
||||
defer func() {
|
||||
// On error, don't bring down the entire server.
|
||||
x := recover()
|
||||
if x != nil {
|
||||
log.Error("monitordnsbl panic", mlog.Field("panic", x))
|
||||
debug.PrintStack()
|
||||
metrics.PanicInc("serve")
|
||||
}
|
||||
}()
|
||||
|
||||
l, ok := mox.Conf.Static.Listeners["public"]
|
||||
if !ok {
|
||||
log.Info("no listener named public, not monitoring our ips at dnsbls")
|
||||
return
|
||||
}
|
||||
|
||||
var zones []dns.Domain
|
||||
for _, zone := range l.SMTP.DNSBLs {
|
||||
d, err := dns.ParseDomain(zone)
|
||||
if err != nil {
|
||||
log.Fatalx("parsing dnsbls zone", err, mlog.Field("zone", zone))
|
||||
}
|
||||
zones = append(zones, d)
|
||||
}
|
||||
if len(zones) == 0 {
|
||||
return
|
||||
}
|
||||
|
||||
type key struct {
|
||||
zone dns.Domain
|
||||
ip string
|
||||
}
|
||||
metrics := map[key]prometheus.GaugeFunc{}
|
||||
var statusMutex sync.Mutex
|
||||
statuses := map[key]bool{}
|
||||
|
||||
resolver := dns.StrictResolver{Pkg: "dnsblmonitor"}
|
||||
var sleep time.Duration // No sleep on first iteration.
|
||||
for {
|
||||
time.Sleep(sleep)
|
||||
sleep = 3 * time.Hour
|
||||
|
||||
ips, err := mox.IPs(mox.Context)
|
||||
if err != nil {
|
||||
log.Errorx("listing ips for dnsbl monitor", err)
|
||||
continue
|
||||
}
|
||||
for _, ip := range ips {
|
||||
if ip.IsLoopback() || ip.IsPrivate() {
|
||||
continue
|
||||
}
|
||||
|
||||
for _, zone := range zones {
|
||||
status, expl, err := dnsbl.Lookup(mox.Context, resolver, zone, ip)
|
||||
if err != nil {
|
||||
log.Errorx("dnsbl monitor lookup", err, mlog.Field("ip", ip), mlog.Field("zone", zone), mlog.Field("expl", expl), mlog.Field("status", status))
|
||||
}
|
||||
k := key{zone, ip.String()}
|
||||
|
||||
statusMutex.Lock()
|
||||
statuses[k] = status == dnsbl.StatusPass
|
||||
statusMutex.Unlock()
|
||||
|
||||
if _, ok := metrics[k]; !ok {
|
||||
metrics[k] = promauto.NewGaugeFunc(
|
||||
prometheus.GaugeOpts{
|
||||
Name: "mox_dnsbl_ips_success",
|
||||
Help: "DNSBL lookups to configured DNSBLs of our IPs.",
|
||||
ConstLabels: prometheus.Labels{
|
||||
"zone": zone.String(),
|
||||
"ip": k.ip,
|
||||
},
|
||||
},
|
||||
func() float64 {
|
||||
statusMutex.Lock()
|
||||
defer statusMutex.Unlock()
|
||||
if statuses[k] {
|
||||
return 1
|
||||
}
|
||||
return 0
|
||||
},
|
||||
)
|
||||
}
|
||||
time.Sleep(time.Second)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func cmdServe(c *cmd) {
|
||||
c.help = `Start mox, serving SMTP/IMAP/HTTPS.
|
||||
|
||||
Incoming email is accepted over SMTP. Email can be retrieved by users using
|
||||
IMAP. HTTP listeners are started for the admin/account web interfaces, and for
|
||||
automated TLS configuration. Missing essential TLS certificates are immediately
|
||||
requested, other TLS certificates are requested on demand.
|
||||
`
|
||||
args := c.Parse()
|
||||
if len(args) != 0 {
|
||||
c.Usage()
|
||||
}
|
||||
mox.MustLoadConfig()
|
||||
|
||||
mox.Shutdown = make(chan struct{})
|
||||
servectx, servecancel := context.WithCancel(context.Background())
|
||||
mox.Context = servectx
|
||||
|
||||
mlog.Logfmt = true
|
||||
log := mlog.New("serve")
|
||||
|
||||
if os.Getuid() == 0 {
|
||||
log.Fatal("refusing to run as root, please start mox as unprivileged user")
|
||||
}
|
||||
|
||||
if fds := os.Getenv("MOX_RESTART_CTL_SOCKET"); fds != "" {
|
||||
log.Print("restarted")
|
||||
|
||||
fd, err := strconv.ParseUint(fds, 10, 32)
|
||||
if err != nil {
|
||||
log.Fatalx("restart with invalid ctl socket", err, mlog.Field("fd", fds))
|
||||
}
|
||||
f := os.NewFile(uintptr(fd), "restartctl")
|
||||
if _, err := fmt.Fprint(f, "ok\n"); err != nil {
|
||||
log.Infox("writing ok to restart ctl socket", err)
|
||||
}
|
||||
if err := f.Close(); err != nil {
|
||||
log.Errorx("closing restart ctl socket", err)
|
||||
}
|
||||
}
|
||||
log.Print("starting up", mlog.Field("version", moxvar.Version))
|
||||
|
||||
shutdown := func() {
|
||||
// We indicate we are shutting down. Causes new connections and new SMTP commands to be rejected. Should stop active connections pretty quickly.
|
||||
close(mox.Shutdown)
|
||||
|
||||
// Now we are going to wait for all connections to be gone, up to a timeout.
|
||||
done := mox.Connections.Done()
|
||||
select {
|
||||
case <-done:
|
||||
log.Print("clean shutdown")
|
||||
|
||||
case <-time.Tick(3 * time.Second):
|
||||
// We now cancel all pending operations, and set an immediate deadline on sockets. Should get us a clean shutdown relatively quickly.
|
||||
servecancel()
|
||||
mox.Connections.Shutdown()
|
||||
|
||||
select {
|
||||
case <-done:
|
||||
log.Print("no more connections, shutdown is clean")
|
||||
case <-time.Tick(time.Second):
|
||||
log.Print("shutting down with pending sockets")
|
||||
}
|
||||
}
|
||||
servecancel() // Keep go vet happy.
|
||||
if err := os.Remove(mox.DataDirPath("ctl")); err != nil {
|
||||
log.Errorx("removing ctl unix domain socket during shutdown", err)
|
||||
}
|
||||
}
|
||||
|
||||
if err := moxio.CheckUmask(); err != nil {
|
||||
log.Errorx("bad umask", err)
|
||||
}
|
||||
|
||||
if mox.Conf.Static.CheckUpdates {
|
||||
checkUpdates := func() {
|
||||
current, lastknown, mtime, err := mox.LastKnown()
|
||||
if err != nil {
|
||||
log.Infox("determining own version before checking for updates, trying again in 1h", err)
|
||||
time.Sleep(time.Hour)
|
||||
return
|
||||
}
|
||||
if !mtime.IsZero() && time.Since(mtime) < 24*time.Hour {
|
||||
time.Sleep(24*time.Hour - time.Since(mtime))
|
||||
}
|
||||
now := time.Now()
|
||||
if err := os.Chtimes(mox.DataDirPath("lastknownversion"), now, now); err != nil {
|
||||
log.Infox("setting mtime on lastknownversion file, for checking only once per 24h, trying again in 1h", err)
|
||||
return
|
||||
}
|
||||
log.Debug("checking for updates", mlog.Field("lastknown", lastknown))
|
||||
updatesctx, updatescancel := context.WithTimeout(mox.Context, time.Minute)
|
||||
latest, _, changelog, err := updates.Check(updatesctx, dns.StrictResolver{}, dns.Domain{ASCII: changelogDomain}, lastknown, changelogURL, changelogPubKey)
|
||||
updatescancel()
|
||||
if err != nil {
|
||||
log.Infox("checking for updates", err, mlog.Field("latest", latest))
|
||||
return
|
||||
}
|
||||
if !latest.After(lastknown) {
|
||||
log.Debug("no new version available")
|
||||
return
|
||||
}
|
||||
if len(changelog.Changes) == 0 {
|
||||
log.Info("new version available, but changelog is empty, ignoring", mlog.Field("latest", latest))
|
||||
return
|
||||
}
|
||||
|
||||
var cl string
|
||||
for i := len(changelog.Changes) - 1; i >= 0; i-- {
|
||||
cl += changelog.Changes[i].Text + "\n\n"
|
||||
}
|
||||
|
||||
a, err := store.OpenAccount(mox.Conf.Static.Postmaster.Account)
|
||||
if err != nil {
|
||||
log.Infox("open account for postmaster changelog delivery", err)
|
||||
return
|
||||
}
|
||||
defer a.Close()
|
||||
f, err := store.CreateMessageTemp("changelog")
|
||||
if err != nil {
|
||||
log.Infox("making temporary message file for changelog delivery", err)
|
||||
return
|
||||
}
|
||||
m := &store.Message{Received: time.Now(), Flags: store.Flags{Flagged: true}}
|
||||
n, err := fmt.Fprintf(f, "Date: %s\r\nSubject: mox update %s available, changelog\r\n\r\nHi!\r\n\r\nVersion %s of mox is available.\r\nThe changes compared to the previous update notification email:\r\n\r\n%s\r\n\r\nDon't forget to update, this install is at %s.\r\nPlease report any issues at https://github.com/mjl-/mox\r\n", time.Now().Format(message.RFC5322Z), latest, latest, strings.ReplaceAll(cl, "\n", "\r\n"), current)
|
||||
if err != nil {
|
||||
log.Infox("writing temporary message file for changelog delivery", err)
|
||||
return
|
||||
}
|
||||
m.Size = int64(n)
|
||||
if err := a.DeliverMailbox(log, mox.Conf.Static.Postmaster.Mailbox, m, f, true); err != nil {
|
||||
log.Infox("changelog delivery", err)
|
||||
if err := os.Remove(f.Name()); err != nil {
|
||||
log.Infox("removing temporary changelog message after delivery failure", err)
|
||||
}
|
||||
}
|
||||
log.Info("delivered changelog", mlog.Field("current", current), mlog.Field("lastknown", lastknown), mlog.Field("latest", latest))
|
||||
if err := mox.StoreLastKnown(latest); err != nil {
|
||||
// This will be awkward, we'll keep notifying the postmaster once every 24h...
|
||||
log.Infox("updating last known version", err)
|
||||
}
|
||||
}
|
||||
|
||||
go func() {
|
||||
for {
|
||||
checkUpdates()
|
||||
}
|
||||
}()
|
||||
}
|
||||
|
||||
// Initialize key and random buffer for creating opaque SMTP
|
||||
// transaction IDs based on "cid"s.
|
||||
recvidpath := mox.DataDirPath("receivedid.key")
|
||||
recvidbuf, err := os.ReadFile(recvidpath)
|
||||
if err != nil || len(recvidbuf) != 16+8 {
|
||||
recvidbuf = make([]byte, 16+8)
|
||||
if _, err := cryptorand.Read(recvidbuf); err != nil {
|
||||
log.Fatalx("reading random recvid data", err)
|
||||
}
|
||||
if err := os.WriteFile(recvidpath, recvidbuf, 0660); err != nil {
|
||||
log.Fatalx("writing recvidpath", err, mlog.Field("path", recvidpath))
|
||||
}
|
||||
}
|
||||
if err := mox.ReceivedIDInit(recvidbuf[:16], recvidbuf[16:]); err != nil {
|
||||
log.Fatalx("init receivedid", err)
|
||||
}
|
||||
|
||||
// We start the network listeners first. If an instance is already running, we'll
|
||||
// get errors about address being in use. We listen to the unix domain socket
|
||||
// afterwards, which we always remove before listening. We need to do that because
|
||||
// we may not have cleaned up our control socket during unexpected shutdown. We
|
||||
// don't want to remove and listen on the unix domain socket first. If we would, we
|
||||
// would make the existing instance unreachable over its ctl socket, and then fail
|
||||
// because the network addresses are taken.
|
||||
mtastsdbRefresher := true
|
||||
if err := start(mtastsdbRefresher); err != nil {
|
||||
log.Fatalx("start", err)
|
||||
}
|
||||
|
||||
go monitorDNSBL(log)
|
||||
|
||||
ctlpath := mox.DataDirPath("ctl")
|
||||
os.Remove(ctlpath)
|
||||
ctl, err := net.Listen("unix", ctlpath)
|
||||
if err != nil {
|
||||
log.Fatalx("listen on ctl unix domain socket", err)
|
||||
}
|
||||
go func() {
|
||||
for {
|
||||
conn, err := ctl.Accept()
|
||||
if err != nil {
|
||||
log.Printx("accept for ctl", err)
|
||||
continue
|
||||
}
|
||||
cid := mox.Cid()
|
||||
ctx := context.WithValue(mox.Context, mlog.CidKey, cid)
|
||||
go servectl(ctx, log.WithCid(cid), conn, shutdown)
|
||||
}
|
||||
}()
|
||||
|
||||
// Remove old temporary files that somehow haven't been cleaned up.
|
||||
tmpdir := mox.DataDirPath("tmp")
|
||||
os.MkdirAll(tmpdir, 0770)
|
||||
tmps, err := os.ReadDir(tmpdir)
|
||||
if err != nil {
|
||||
log.Errorx("listing files in tmpdir", err)
|
||||
} else {
|
||||
now := time.Now()
|
||||
for _, e := range tmps {
|
||||
if fi, err := e.Info(); err != nil {
|
||||
log.Errorx("stat tmp file", err, mlog.Field("filename", e.Name()))
|
||||
} else if now.Sub(fi.ModTime()) > 7*24*time.Hour {
|
||||
p := filepath.Join(tmpdir, e.Name())
|
||||
if err := os.Remove(p); err != nil {
|
||||
log.Errorx("removing stale temporary file", err, mlog.Field("path", p))
|
||||
} else {
|
||||
log.Info("removed stale temporary file", mlog.Field("path", p))
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Graceful shutdown.
|
||||
sigc := make(chan os.Signal, 1)
|
||||
signal.Notify(sigc, os.Interrupt, syscall.SIGTERM)
|
||||
sig := <-sigc
|
||||
log.Print("shutting down, waiting max 3s for existing connections", mlog.Field("signal", sig))
|
||||
shutdown()
|
||||
}
|
||||
Reference in New Issue
Block a user