mirror of
https://github.com/mjl-/mox.git
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241 lines
7.7 KiB
Go
241 lines
7.7 KiB
Go
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// 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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"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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// ListenAndServe starts listeners for HTTP, including those required for ACME to
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// generate TLS certificates.
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func ListenAndServe() {
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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 && port == 443 && 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, 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.SMTP.Enabled && !l.SMTP.NoSTARTTLS || l.Submissions.Enabled || l.IMAPS.Enabled {
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ensureServe(true, 443, "acme-tls-alpn01")
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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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srv.mux.HandleFunc("/", safeHeaders(adminIndex))
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srv.mux.HandleFunc("/admin/", safeHeaders(adminHandle))
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srv.mux.HandleFunc("/account/", safeHeaders(accountHandle))
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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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srv.mux.HandleFunc("/", safeHeaders(adminIndex))
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srv.mux.HandleFunc("/admin/", safeHeaders(adminHandle))
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srv.mux.HandleFunc("/account/", safeHeaders(accountHandle))
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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(true, 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(true, 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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listenAndServe(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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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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const html = `<!doctype html>
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<html>
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<head>
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<title>mox</title>
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<meta name="viewport" content="width=device-width" />
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<style>
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body, html { font-family: ubuntu, lato, sans-serif; font-size: 16px; padding: 1em; }
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* { margin: 0; padding: 0; box-sizing: border-box; }
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h1, h2, h3, h4 { margin-bottom: 1ex; }
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h1 { font-size: 1.2rem; }
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</style>
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</head>
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<body>
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<h1>mox</h1>
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<div><a href="/account/">/account/</a>, for regular login</div>
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<div><a href="/admin/">/admin/</a>, for adminstrators</div>
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</body>
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</html>`
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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w.Write([]byte(html))
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}
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func listenAndServe(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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xlog.Print("http listener", mlog.Field("name", name), mlog.Field("kinds", strings.Join(kinds, ",")), mlog.Field("address", addr))
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ln, err = net.Listen(mox.Network(ip), addr)
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if err != nil {
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xlog.Fatalx("http: listen"+mox.LinuxSetcapHint(err), err, mlog.Field("addr", addr))
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}
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} else {
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protocol = "https"
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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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ln, err = tls.Listen(mox.Network(ip), addr, tlsConfig)
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if err != nil {
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xlog.Fatalx("https: listen"+mox.LinuxSetcapHint(err), err, mlog.Field("addr", addr))
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}
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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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go 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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}
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