mirror of
https://github.com/mjl-/mox.git
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92e018e463
makes it easier to run on bsd's, where you cannot (easily?) let non-root users
bind to ports <1024. starting as root also paves the way for future improvements
with privilege separation.
unfortunately, this requires changes to how you start mox. though mox will help
by automatically fix up dir/file permissions/ownership.
if you start mox from the systemd unit file, you should update it so it starts
as root and adds a few additional capabilities:
# first update the mox binary, then, as root:
./mox config printservice >mox.service
systemctl daemon-reload
systemctl restart mox
journalctl -f -u mox &
# you should see mox start up, with messages about fixing permissions on dirs/files.
if you used the recommended config/ and data/ directory, in a directory just for
mox, and with the mox user called "mox", this should be enough.
if you don't want mox to modify dir/file permissions, set "NoFixPermissions:
true" in mox.conf.
if you named the mox user something else than mox, e.g. "_mox", add "User: _mox"
to mox.conf.
if you created a shared service user as originally suggested, you may want to
get rid of that as it is no longer useful and may get in the way. e.g. if you
had /home/service/mox with a "service" user, that service user can no longer
access any files: only mox and root can.
this also adds scripts for building mox docker images for alpine-supported
platforms.
the "restart" subcommand has been removed. it wasn't all that useful and got in
the way.
and another change: when adding a domain while mtasts isn't enabled, don't add
the per-domain mtasts config, as it would cause failure to add the domain.
based on report from setting up mox on openbsd from mteege.
and based on issue #3. thanks for the feedback!
254 lines
8.2 KiB
Go
254 lines
8.2 KiB
Go
// Package http provides HTTP listeners/servers, for
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// autoconfiguration/autodiscovery, the account and admin web interface and
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// MTA-STS policies.
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package http
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import (
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"crypto/tls"
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"fmt"
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golog "log"
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"net"
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"net/http"
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"os"
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"strings"
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"time"
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_ "net/http/pprof"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/mjl-/mox/config"
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"github.com/mjl-/mox/dns"
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"github.com/mjl-/mox/mlog"
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"github.com/mjl-/mox/mox-"
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)
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var xlog = mlog.New("http")
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// Set some http headers that should prevent potential abuse. Better safe than sorry.
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func safeHeaders(fn http.HandlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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h := w.Header()
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h.Set("X-Frame-Options", "deny")
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h.Set("X-Content-Type-Options", "nosniff")
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h.Set("Content-Security-Policy", "default-src 'self' 'unsafe-inline' data:")
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h.Set("Referrer-Policy", "same-origin")
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fn(w, r)
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}
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}
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// Listen binds to sockets for HTTP listeners, including those required for ACME to
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// generate TLS certificates. It stores the listeners so Serve can start serving them.
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func Listen() {
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type serve struct {
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kinds []string
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tlsConfig *tls.Config
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mux *http.ServeMux
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}
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for name, l := range mox.Conf.Static.Listeners {
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portServe := map[int]serve{}
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var ensureServe func(https bool, port int, kind string) serve
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ensureServe = func(https bool, port int, kind string) serve {
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s, ok := portServe[port]
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if !ok {
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s = serve{nil, nil, &http.ServeMux{}}
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}
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s.kinds = append(s.kinds, kind)
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if https && l.TLS.ACME != "" {
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s.tlsConfig = l.TLS.ACMEConfig
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} else if https {
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s.tlsConfig = l.TLS.Config
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if l.TLS.ACME != "" {
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ensureServe(true, config.Port(mox.Conf.Static.ACME[l.TLS.ACME].Port, 443), "acme-tls-alpn-01")
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}
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}
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portServe[port] = s
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return s
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}
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if l.TLS != nil && l.TLS.ACME != "" && (l.SMTP.Enabled && !l.SMTP.NoSTARTTLS || l.Submissions.Enabled || l.IMAPS.Enabled) {
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ensureServe(true, config.Port(mox.Conf.Static.ACME[l.TLS.ACME].Port, 443), "acme-tls-alpn01")
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}
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if l.AccountHTTP.Enabled {
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srv := ensureServe(false, config.Port(l.AccountHTTP.Port, 80), "account-http")
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srv.mux.HandleFunc("/", safeHeaders(accountHandle))
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}
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if l.AccountHTTPS.Enabled {
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srv := ensureServe(true, config.Port(l.AccountHTTPS.Port, 443), "account-https")
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srv.mux.HandleFunc("/", safeHeaders(accountHandle))
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}
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if l.AdminHTTP.Enabled {
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srv := ensureServe(false, config.Port(l.AdminHTTP.Port, 80), "admin-http")
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if !l.AccountHTTP.Enabled {
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srv.mux.HandleFunc("/", safeHeaders(adminIndex))
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}
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srv.mux.HandleFunc("/admin/", safeHeaders(adminHandle))
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}
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if l.AdminHTTPS.Enabled {
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srv := ensureServe(true, config.Port(l.AdminHTTPS.Port, 443), "admin-https")
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if !l.AccountHTTPS.Enabled {
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srv.mux.HandleFunc("/", safeHeaders(adminIndex))
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}
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srv.mux.HandleFunc("/admin/", safeHeaders(adminHandle))
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}
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if l.MetricsHTTP.Enabled {
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srv := ensureServe(false, config.Port(l.MetricsHTTP.Port, 8010), "metrics-http")
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srv.mux.Handle("/metrics", safeHeaders(promhttp.Handler().ServeHTTP))
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srv.mux.HandleFunc("/", safeHeaders(func(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path != "/" {
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http.NotFound(w, r)
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return
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} else if r.Method != "GET" {
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http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
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return
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}
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w.Header().Set("Content-Type", "text/html")
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fmt.Fprint(w, `<html><body>see <a href="/metrics">/metrics</a></body></html>`)
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}))
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}
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if l.AutoconfigHTTPS.Enabled {
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srv := ensureServe(!l.AutoconfigHTTPS.NonTLS, config.Port(l.AutoconfigHTTPS.Port, 443), "autoconfig-https")
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srv.mux.HandleFunc("/mail/config-v1.1.xml", safeHeaders(autoconfHandle(l)))
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srv.mux.HandleFunc("/autodiscover/autodiscover.xml", safeHeaders(autodiscoverHandle(l)))
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}
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if l.MTASTSHTTPS.Enabled {
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srv := ensureServe(!l.AutoconfigHTTPS.NonTLS, config.Port(l.MTASTSHTTPS.Port, 443), "mtasts-https")
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srv.mux.HandleFunc("/.well-known/mta-sts.txt", safeHeaders(mtastsPolicyHandle))
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}
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if l.PprofHTTP.Enabled {
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// Importing net/http/pprof registers handlers on the default serve mux.
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port := config.Port(l.PprofHTTP.Port, 8011)
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if _, ok := portServe[port]; ok {
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xlog.Fatal("cannot serve pprof on same endpoint as other http services")
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}
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portServe[port] = serve{[]string{"pprof-http"}, nil, http.DefaultServeMux}
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}
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// We'll explicitly ensure these TLS certs exist (e.g. are created with ACME)
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// immediately after startup. We only do so for our explicitly hostnames, not for
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// autoconfig or mta-sts DNS records, they can be requested on demand (perhaps
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// never).
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ensureHosts := map[dns.Domain]struct{}{}
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if l.TLS != nil && l.TLS.ACME != "" {
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m := mox.Conf.Static.ACME[l.TLS.ACME].Manager
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m.AllowHostname(mox.Conf.Static.HostnameDomain)
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ensureHosts[mox.Conf.Static.HostnameDomain] = struct{}{}
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if l.HostnameDomain.ASCII != "" {
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m.AllowHostname(l.HostnameDomain)
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ensureHosts[l.HostnameDomain] = struct{}{}
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}
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go func() {
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// Just in case someone adds quite some domains to their config. We don't want to
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// hit any ACME rate limits.
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if len(ensureHosts) > 10 {
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return
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}
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time.Sleep(1 * time.Second)
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i := 0
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for hostname := range ensureHosts {
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if i > 0 {
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// Sleep just a little. We don't want to hammer our ACME provider, e.g. Let's Encrypt.
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time.Sleep(10 * time.Second)
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}
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i++
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hello := &tls.ClientHelloInfo{
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ServerName: hostname.ASCII,
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// Make us fetch an ECDSA P256 cert.
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// We add TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 to get around the ecDSA check in autocert.
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CipherSuites: []uint16{tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, tls.TLS_AES_128_GCM_SHA256},
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SupportedCurves: []tls.CurveID{tls.CurveP256},
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SignatureSchemes: []tls.SignatureScheme{tls.ECDSAWithP256AndSHA256},
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SupportedVersions: []uint16{tls.VersionTLS13},
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}
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xlog.Print("ensuring certificate availability", mlog.Field("hostname", hostname))
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if _, err := m.Manager.GetCertificate(hello); err != nil {
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xlog.Errorx("requesting automatic certificate", err, mlog.Field("hostname", hostname))
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}
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}
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}()
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}
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for port, srv := range portServe {
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for _, ip := range l.IPs {
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listen1(ip, port, srv.tlsConfig, name, srv.kinds, srv.mux)
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}
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}
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}
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}
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// Only used when the account page is not active on the same listener.
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func adminIndex(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path != "/" {
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http.NotFound(w, r)
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return
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}
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if r.Method != "GET" {
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http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
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return
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}
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http.Redirect(w, r, "/admin/", http.StatusSeeOther)
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}
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// functions to be launched in goroutine that will serve on a listener.
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var servers []func()
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// listen prepares a listener, and adds it to "servers", to be launched (if not running as root) through Serve.
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func listen1(ip string, port int, tlsConfig *tls.Config, name string, kinds []string, mux *http.ServeMux) {
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addr := net.JoinHostPort(ip, fmt.Sprintf("%d", port))
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var protocol string
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var ln net.Listener
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var err error
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if tlsConfig == nil {
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protocol = "http"
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if os.Getuid() == 0 {
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xlog.Print("http listener", mlog.Field("name", name), mlog.Field("kinds", strings.Join(kinds, ",")), mlog.Field("address", addr))
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}
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ln, err = mox.Listen(mox.Network(ip), addr)
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if err != nil {
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xlog.Fatalx("http: listen", err, mlog.Field("addr", addr))
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}
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} else {
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protocol = "https"
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if os.Getuid() == 0 {
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xlog.Print("https listener", mlog.Field("name", name), mlog.Field("kinds", strings.Join(kinds, ",")), mlog.Field("address", addr))
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}
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ln, err = mox.Listen(mox.Network(ip), addr)
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if err != nil {
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xlog.Fatalx("https: listen", err, mlog.Field("addr", addr))
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}
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ln = tls.NewListener(ln, tlsConfig)
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}
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server := &http.Server{
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Handler: mux,
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TLSConfig: tlsConfig,
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ErrorLog: golog.New(mlog.ErrWriter(xlog.Fields(mlog.Field("pkg", "net/http")), mlog.LevelInfo, protocol+" error"), "", 0),
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}
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serve := func() {
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err := server.Serve(ln)
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xlog.Fatalx(protocol+": serve", err)
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}
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servers = append(servers, serve)
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}
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// Serve starts serving on the initialized listeners.
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func Serve() {
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go manageAuthCache()
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go importManage()
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for _, serve := range servers {
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go serve()
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}
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servers = nil
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}
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